// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ebtable_filter
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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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*/
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#include <linux/netfilter_bridge/ebtables.h>
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#include <uapi/linux/netfilter_bridge.h>
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#include <linux/module.h>
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#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
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(1 << NF_BR_LOCAL_OUT))
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static struct ebt_entries initial_chains[] = {
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{
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.name = "INPUT",
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.policy = EBT_ACCEPT,
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},
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{
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.name = "FORWARD",
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.policy = EBT_ACCEPT,
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},
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{
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.name = "OUTPUT",
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.policy = EBT_ACCEPT,
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},
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};
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static struct ebt_replace_kernel initial_table = {
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.name = "filter",
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.valid_hooks = FILTER_VALID_HOOKS,
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.entries_size = 3 * sizeof(struct ebt_entries),
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.hook_entry = {
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[NF_BR_LOCAL_IN] = &initial_chains[0],
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[NF_BR_FORWARD] = &initial_chains[1],
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[NF_BR_LOCAL_OUT] = &initial_chains[2],
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},
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.entries = (char *)initial_chains,
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};
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static const struct ebt_table frame_filter = {
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.name = "filter",
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.table = &initial_table,
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.valid_hooks = FILTER_VALID_HOOKS,
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.me = THIS_MODULE,
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};
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static unsigned int
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ebt_in_hook(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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return ebt_do_table(skb, state, state->net->xt.frame_filter);
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}
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static unsigned int
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ebt_out_hook(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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return ebt_do_table(skb, state, state->net->xt.frame_filter);
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}
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static const struct nf_hook_ops ebt_ops_filter[] = {
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{
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.hook = ebt_in_hook,
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.pf = NFPROTO_BRIDGE,
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.hooknum = NF_BR_LOCAL_IN,
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.priority = NF_BR_PRI_FILTER_BRIDGED,
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},
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{
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.hook = ebt_in_hook,
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.pf = NFPROTO_BRIDGE,
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.hooknum = NF_BR_FORWARD,
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.priority = NF_BR_PRI_FILTER_BRIDGED,
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},
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{
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.hook = ebt_out_hook,
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.pf = NFPROTO_BRIDGE,
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.hooknum = NF_BR_LOCAL_OUT,
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.priority = NF_BR_PRI_FILTER_OTHER,
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},
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};
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static int __net_init frame_filter_net_init(struct net *net)
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{
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return ebt_register_table(net, &frame_filter, ebt_ops_filter,
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&net->xt.frame_filter);
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}
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static void __net_exit frame_filter_net_pre_exit(struct net *net)
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{
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ebt_unregister_table_pre_exit(net, "filter", ebt_ops_filter);
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}
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static void __net_exit frame_filter_net_exit(struct net *net)
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{
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ebt_unregister_table(net, net->xt.frame_filter);
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}
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static struct pernet_operations frame_filter_net_ops = {
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.init = frame_filter_net_init,
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.exit = frame_filter_net_exit,
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.pre_exit = frame_filter_net_pre_exit,
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};
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static int __init ebtable_filter_init(void)
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{
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return register_pernet_subsys(&frame_filter_net_ops);
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}
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static void __exit ebtable_filter_fini(void)
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{
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unregister_pernet_subsys(&frame_filter_net_ops);
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}
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module_init(ebtable_filter_init);
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module_exit(ebtable_filter_fini);
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MODULE_LICENSE("GPL");
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