diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /net/ipv6/netfilter/ip6table_nat.c |
Initial import
Diffstat (limited to 'net/ipv6/netfilter/ip6table_nat.c')
-rw-r--r-- | net/ipv6/netfilter/ip6table_nat.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6table_nat.c b/net/ipv6/netfilter/ip6table_nat.c new file mode 100644 index 000000000..c3a7f7af0 --- /dev/null +++ b/net/ipv6/netfilter/ip6table_nat.c @@ -0,0 +1,156 @@ +/* + * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> + * + * 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 <linux/module.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv6.h> +#include <linux/netfilter_ipv6/ip6_tables.h> +#include <linux/ipv6.h> +#include <net/ipv6.h> + +#include <net/netfilter/nf_nat.h> +#include <net/netfilter/nf_nat_core.h> +#include <net/netfilter/nf_nat_l3proto.h> + +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(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state, + struct nf_conn *ct) +{ + struct net *net = nf_ct_net(ct); + + return ip6t_do_table(skb, ops->hooknum, state, net->ipv6.ip6table_nat); +} + +static unsigned int ip6table_nat_fn(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + return nf_nat_ipv6_fn(ops, skb, state, ip6table_nat_do_chain); +} + +static unsigned int ip6table_nat_in(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + return nf_nat_ipv6_in(ops, skb, state, ip6table_nat_do_chain); +} + +static unsigned int ip6table_nat_out(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + return nf_nat_ipv6_out(ops, skb, state, ip6table_nat_do_chain); +} + +static unsigned int ip6table_nat_local_fn(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + return nf_nat_ipv6_local_fn(ops, 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, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV6, + .hooknum = NF_INET_PRE_ROUTING, + .priority = NF_IP6_PRI_NAT_DST, + }, + /* After packet filtering, change source */ + { + .hook = ip6table_nat_out, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV6, + .hooknum = NF_INET_POST_ROUTING, + .priority = NF_IP6_PRI_NAT_SRC, + }, + /* Before packet filtering, change destination */ + { + .hook = ip6table_nat_local_fn, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV6, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP6_PRI_NAT_DST, + }, + /* After packet filtering, change source */ + { + .hook = ip6table_nat_fn, + .owner = THIS_MODULE, + .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"); |