| /* |
| * 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) |
| { |
| int ret; |
| |
| ret = ebt_do_table(NF_BR_BROUTING, skb, skb->dev, NULL, |
| dev_net(skb->dev)->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"); |