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