/* * Copyright (c) 2011 Patrick McHardy * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Based on Rusty Russell's IPv4 NAT code. Development of IPv6 NAT * funded by Astaro. */ #include #include #include #include #include #include #include #include #include static const struct xt_table nf_nat_ipv6_table = { .name = "nat", .valid_hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_LOCAL_IN), .me = THIS_MODULE, .af = NFPROTO_IPV6, }; static unsigned int ip6table_nat_do_chain(void *priv, struct sk_buff *skb, const struct nf_hook_state *state, struct nf_conn *ct) { return ip6t_do_table(skb, state, state->net->ipv6.ip6table_nat); } static unsigned int ip6table_nat_fn(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { return nf_nat_ipv6_fn(priv, skb, state, ip6table_nat_do_chain); } static unsigned int ip6table_nat_in(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { return nf_nat_ipv6_in(priv, skb, state, ip6table_nat_do_chain); } static unsigned int ip6table_nat_out(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { return nf_nat_ipv6_out(priv, skb, state, ip6table_nat_do_chain); } static unsigned int ip6table_nat_local_fn(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) { return nf_nat_ipv6_local_fn(priv, skb, state, ip6table_nat_do_chain); } static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = { /* Before packet filtering, change destination */ { .hook = ip6table_nat_in, .pf = NFPROTO_IPV6, .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP6_PRI_NAT_DST, }, /* After packet filtering, change source */ { .hook = ip6table_nat_out, .pf = NFPROTO_IPV6, .hooknum = NF_INET_POST_ROUTING, .priority = NF_IP6_PRI_NAT_SRC, }, /* Before packet filtering, change destination */ { .hook = ip6table_nat_local_fn, .pf = NFPROTO_IPV6, .hooknum = NF_INET_LOCAL_OUT, .priority = NF_IP6_PRI_NAT_DST, }, /* After packet filtering, change source */ { .hook = ip6table_nat_fn, .pf = NFPROTO_IPV6, .hooknum = NF_INET_LOCAL_IN, .priority = NF_IP6_PRI_NAT_SRC, }, }; static int __net_init ip6table_nat_net_init(struct net *net) { struct ip6t_replace *repl; repl = ip6t_alloc_initial_table(&nf_nat_ipv6_table); if (repl == NULL) return -ENOMEM; net->ipv6.ip6table_nat = ip6t_register_table(net, &nf_nat_ipv6_table, repl); kfree(repl); return PTR_ERR_OR_ZERO(net->ipv6.ip6table_nat); } static void __net_exit ip6table_nat_net_exit(struct net *net) { ip6t_unregister_table(net, net->ipv6.ip6table_nat); } static struct pernet_operations ip6table_nat_net_ops = { .init = ip6table_nat_net_init, .exit = ip6table_nat_net_exit, }; static int __init ip6table_nat_init(void) { int err; err = register_pernet_subsys(&ip6table_nat_net_ops); if (err < 0) goto err1; err = nf_register_hooks(nf_nat_ipv6_ops, ARRAY_SIZE(nf_nat_ipv6_ops)); if (err < 0) goto err2; return 0; err2: unregister_pernet_subsys(&ip6table_nat_net_ops); err1: return err; } static void __exit ip6table_nat_exit(void) { nf_unregister_hooks(nf_nat_ipv6_ops, ARRAY_SIZE(nf_nat_ipv6_ops)); unregister_pernet_subsys(&ip6table_nat_net_ops); } module_init(ip6table_nat_init); module_exit(ip6table_nat_exit); MODULE_LICENSE("GPL");