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Linux/net/ipv6/netfilter/nft_chain_nat_ipv6.c

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  1 /*
  2  * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
  3  * Copyright (c) 2012 Intel Corporation
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms and conditions of the GNU General Public License,
  7  * version 2, as published by the Free Software Foundation.
  8  *
  9  */
 10 
 11 #include <linux/module.h>
 12 #include <linux/init.h>
 13 #include <linux/list.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/ip.h>
 16 #include <linux/netfilter.h>
 17 #include <linux/netfilter_ipv6.h>
 18 #include <linux/netfilter/nf_tables.h>
 19 #include <net/netfilter/nf_conntrack.h>
 20 #include <net/netfilter/nf_nat.h>
 21 #include <net/netfilter/nf_nat_core.h>
 22 #include <net/netfilter/nf_tables.h>
 23 #include <net/netfilter/nf_tables_ipv6.h>
 24 #include <net/netfilter/nf_nat_l3proto.h>
 25 #include <net/ipv6.h>
 26 
 27 static unsigned int nft_nat_do_chain(void *priv,
 28                                      struct sk_buff *skb,
 29                                      const struct nf_hook_state *state,
 30                                      struct nf_conn *ct)
 31 {
 32         struct nft_pktinfo pkt;
 33 
 34         nft_set_pktinfo(&pkt, skb, state);
 35         nft_set_pktinfo_ipv6(&pkt, skb);
 36 
 37         return nft_do_chain(&pkt, priv);
 38 }
 39 
 40 static unsigned int nft_nat_ipv6_fn(void *priv,
 41                                     struct sk_buff *skb,
 42                                     const struct nf_hook_state *state)
 43 {
 44         return nf_nat_ipv6_fn(priv, skb, state, nft_nat_do_chain);
 45 }
 46 
 47 static unsigned int nft_nat_ipv6_in(void *priv,
 48                                     struct sk_buff *skb,
 49                                     const struct nf_hook_state *state)
 50 {
 51         return nf_nat_ipv6_in(priv, skb, state, nft_nat_do_chain);
 52 }
 53 
 54 static unsigned int nft_nat_ipv6_out(void *priv,
 55                                      struct sk_buff *skb,
 56                                      const struct nf_hook_state *state)
 57 {
 58         return nf_nat_ipv6_out(priv, skb, state, nft_nat_do_chain);
 59 }
 60 
 61 static unsigned int nft_nat_ipv6_local_fn(void *priv,
 62                                           struct sk_buff *skb,
 63                                           const struct nf_hook_state *state)
 64 {
 65         return nf_nat_ipv6_local_fn(priv, skb, state, nft_nat_do_chain);
 66 }
 67 
 68 static int nft_nat_ipv6_init(struct nft_ctx *ctx)
 69 {
 70         return nf_ct_netns_get(ctx->net, ctx->family);
 71 }
 72 
 73 static void nft_nat_ipv6_free(struct nft_ctx *ctx)
 74 {
 75         nf_ct_netns_put(ctx->net, ctx->family);
 76 }
 77 
 78 static const struct nft_chain_type nft_chain_nat_ipv6 = {
 79         .name           = "nat",
 80         .type           = NFT_CHAIN_T_NAT,
 81         .family         = NFPROTO_IPV6,
 82         .owner          = THIS_MODULE,
 83         .hook_mask      = (1 << NF_INET_PRE_ROUTING) |
 84                           (1 << NF_INET_POST_ROUTING) |
 85                           (1 << NF_INET_LOCAL_OUT) |
 86                           (1 << NF_INET_LOCAL_IN),
 87         .hooks          = {
 88                 [NF_INET_PRE_ROUTING]   = nft_nat_ipv6_in,
 89                 [NF_INET_POST_ROUTING]  = nft_nat_ipv6_out,
 90                 [NF_INET_LOCAL_OUT]     = nft_nat_ipv6_local_fn,
 91                 [NF_INET_LOCAL_IN]      = nft_nat_ipv6_fn,
 92         },
 93         .init           = nft_nat_ipv6_init,
 94         .free           = nft_nat_ipv6_free,
 95 };
 96 
 97 static int __init nft_chain_nat_ipv6_init(void)
 98 {
 99         nft_register_chain_type(&nft_chain_nat_ipv6);
100 
101         return 0;
102 }
103 
104 static void __exit nft_chain_nat_ipv6_exit(void)
105 {
106         nft_unregister_chain_type(&nft_chain_nat_ipv6);
107 }
108 
109 module_init(nft_chain_nat_ipv6_init);
110 module_exit(nft_chain_nat_ipv6_exit);
111 
112 MODULE_LICENSE("GPL");
113 MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
114 MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");
115 

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