diff options
Diffstat (limited to 'net/bridge/netfilter/ebtable_nat.c')
-rw-r--r-- | net/bridge/netfilter/ebtable_nat.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/net/bridge/netfilter/ebtable_nat.c b/net/bridge/netfilter/ebtable_nat.c new file mode 100644 index 000000000..9066f7f37 --- /dev/null +++ b/net/bridge/netfilter/ebtable_nat.c @@ -0,0 +1,118 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ebtable_nat + * + * Authors: + * Bart De Schuymer <bdschuym@pandora.be> + * + * April, 2002 + * + */ + +#include <linux/netfilter_bridge/ebtables.h> +#include <uapi/linux/netfilter_bridge.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 const struct ebt_table frame_nat = { + .name = "nat", + .table = &initial_table, + .valid_hooks = NAT_VALID_HOOKS, + .me = THIS_MODULE, +}; + +static const struct nf_hook_ops ebt_ops_nat[] = { + { + .hook = ebt_do_table, + .pf = NFPROTO_BRIDGE, + .hooknum = NF_BR_LOCAL_OUT, + .priority = NF_BR_PRI_NAT_DST_OTHER, + }, + { + .hook = ebt_do_table, + .pf = NFPROTO_BRIDGE, + .hooknum = NF_BR_POST_ROUTING, + .priority = NF_BR_PRI_NAT_SRC, + }, + { + .hook = ebt_do_table, + .pf = NFPROTO_BRIDGE, + .hooknum = NF_BR_PRE_ROUTING, + .priority = NF_BR_PRI_NAT_DST_BRIDGED, + }, +}; + +static int frame_nat_table_init(struct net *net) +{ + return ebt_register_table(net, &frame_nat, ebt_ops_nat); +} + +static void __net_exit frame_nat_net_pre_exit(struct net *net) +{ + ebt_unregister_table_pre_exit(net, "nat"); +} + +static void __net_exit frame_nat_net_exit(struct net *net) +{ + ebt_unregister_table(net, "nat"); +} + +static struct pernet_operations frame_nat_net_ops = { + .exit = frame_nat_net_exit, + .pre_exit = frame_nat_net_pre_exit, +}; + +static int __init ebtable_nat_init(void) +{ + int ret = ebt_register_template(&frame_nat, frame_nat_table_init); + + if (ret) + return ret; + + ret = register_pernet_subsys(&frame_nat_net_ops); + if (ret) { + ebt_unregister_template(&frame_nat); + return ret; + } + + return ret; +} + +static void __exit ebtable_nat_fini(void) +{ + unregister_pernet_subsys(&frame_nat_net_ops); + ebt_unregister_template(&frame_nat); +} + +module_init(ebtable_nat_init); +module_exit(ebtable_nat_fini); +MODULE_LICENSE("GPL"); |