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- /*
- * ebtable_broute
- *
- * Authors:
- * Bart De Schuymer <bdschuym@pandora.be>
- *
- * April, 2002
- *
- * This table lets you choose between routing and bridging for frames
- * entering on a bridge enslaved nic. This table is traversed before any
- * other ebtables table. See net/bridge/br_input.c.
- */
- #include <linux/netfilter_bridge/ebtables.h>
- #include <linux/module.h>
- #include <linux/if_bridge.h>
- /* EBT_ACCEPT means the frame will be bridged
- * EBT_DROP means the frame will be routed
- */
- static struct ebt_entries initial_chain = {
- .name = "BROUTING",
- .policy = EBT_ACCEPT,
- };
- static struct ebt_replace_kernel initial_table = {
- .name = "broute",
- .valid_hooks = 1 << NF_BR_BROUTING,
- .entries_size = sizeof(struct ebt_entries),
- .hook_entry = {
- [NF_BR_BROUTING] = &initial_chain,
- },
- .entries = (char *)&initial_chain,
- };
- static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
- {
- if (valid_hooks & ~(1 << NF_BR_BROUTING))
- return -EINVAL;
- return 0;
- }
- static const struct ebt_table broute_table = {
- .name = "broute",
- .table = &initial_table,
- .valid_hooks = 1 << NF_BR_BROUTING,
- .check = check,
- .me = THIS_MODULE,
- };
- static int ebt_broute(struct sk_buff *skb)
- {
- struct nf_hook_state state;
- int ret;
- nf_hook_state_init(&state, NULL, NF_BR_BROUTING, INT_MIN,
- NFPROTO_BRIDGE, skb->dev, NULL, NULL,
- dev_net(skb->dev), NULL);
- ret = ebt_do_table(skb, &state, state.net->xt.broute_table);
- if (ret == NF_DROP)
- return 1; /* route it */
- return 0; /* bridge it */
- }
- static int __net_init broute_net_init(struct net *net)
- {
- net->xt.broute_table = ebt_register_table(net, &broute_table);
- return PTR_ERR_OR_ZERO(net->xt.broute_table);
- }
- static void __net_exit broute_net_exit(struct net *net)
- {
- ebt_unregister_table(net, net->xt.broute_table);
- }
- static struct pernet_operations broute_net_ops = {
- .init = broute_net_init,
- .exit = broute_net_exit,
- };
- static int __init ebtable_broute_init(void)
- {
- int ret;
- ret = register_pernet_subsys(&broute_net_ops);
- if (ret < 0)
- return ret;
- /* see br_input.c */
- RCU_INIT_POINTER(br_should_route_hook,
- (br_should_route_hook_t *)ebt_broute);
- return 0;
- }
- static void __exit ebtable_broute_fini(void)
- {
- RCU_INIT_POINTER(br_should_route_hook, NULL);
- synchronize_net();
- unregister_pernet_subsys(&broute_net_ops);
- }
- module_init(ebtable_broute_init);
- module_exit(ebtable_broute_fini);
- MODULE_LICENSE("GPL");
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