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- /*
- * ebtable_nat
- *
- * Authors:
- * Bart De Schuymer <bdschuym@pandora.be>
- *
- * April, 2002
- *
- */
- #include <linux/netfilter_bridge/ebtables.h>
- #include <linux/module.h>
- #define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
- (1 << NF_BR_POST_ROUTING))
- static struct ebt_entries initial_chains[] = {
- {
- .name = "PREROUTING",
- .policy = EBT_ACCEPT,
- },
- {
- .name = "OUTPUT",
- .policy = EBT_ACCEPT,
- },
- {
- .name = "POSTROUTING",
- .policy = EBT_ACCEPT,
- }
- };
- static struct ebt_replace_kernel initial_table = {
- .name = "nat",
- .valid_hooks = NAT_VALID_HOOKS,
- .entries_size = 3 * sizeof(struct ebt_entries),
- .hook_entry = {
- [NF_BR_PRE_ROUTING] = &initial_chains[0],
- [NF_BR_LOCAL_OUT] = &initial_chains[1],
- [NF_BR_POST_ROUTING] = &initial_chains[2],
- },
- .entries = (char *)initial_chains,
- };
- static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
- {
- if (valid_hooks & ~NAT_VALID_HOOKS)
- return -EINVAL;
- return 0;
- }
- static struct ebt_table frame_nat = {
- .name = "nat",
- .table = &initial_table,
- .valid_hooks = NAT_VALID_HOOKS,
- .check = check,
- .me = THIS_MODULE,
- };
- static unsigned int
- ebt_nat_in(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state)
- {
- return ebt_do_table(skb, state, state->net->xt.frame_nat);
- }
- static unsigned int
- ebt_nat_out(void *priv, struct sk_buff *skb,
- const struct nf_hook_state *state)
- {
- return ebt_do_table(skb, state, state->net->xt.frame_nat);
- }
- static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
- {
- .hook = ebt_nat_out,
- .pf = NFPROTO_BRIDGE,
- .hooknum = NF_BR_LOCAL_OUT,
- .priority = NF_BR_PRI_NAT_DST_OTHER,
- },
- {
- .hook = ebt_nat_out,
- .pf = NFPROTO_BRIDGE,
- .hooknum = NF_BR_POST_ROUTING,
- .priority = NF_BR_PRI_NAT_SRC,
- },
- {
- .hook = ebt_nat_in,
- .pf = NFPROTO_BRIDGE,
- .hooknum = NF_BR_PRE_ROUTING,
- .priority = NF_BR_PRI_NAT_DST_BRIDGED,
- },
- };
- static int __net_init frame_nat_net_init(struct net *net)
- {
- net->xt.frame_nat = ebt_register_table(net, &frame_nat);
- return PTR_ERR_OR_ZERO(net->xt.frame_nat);
- }
- static void __net_exit frame_nat_net_exit(struct net *net)
- {
- ebt_unregister_table(net, net->xt.frame_nat);
- }
- static struct pernet_operations frame_nat_net_ops = {
- .init = frame_nat_net_init,
- .exit = frame_nat_net_exit,
- };
- static int __init ebtable_nat_init(void)
- {
- int ret;
- ret = register_pernet_subsys(&frame_nat_net_ops);
- if (ret < 0)
- return ret;
- ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
- if (ret < 0)
- unregister_pernet_subsys(&frame_nat_net_ops);
- return ret;
- }
- static void __exit ebtable_nat_fini(void)
- {
- nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
- unregister_pernet_subsys(&frame_nat_net_ops);
- }
- module_init(ebtable_nat_init);
- module_exit(ebtable_nat_fini);
- MODULE_LICENSE("GPL");
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