| /* |
| * ebt_dnat |
| * |
| * Authors: |
| * Bart De Schuymer <bdschuym@pandora.be> |
| * |
| * June, 2002 |
| * |
| */ |
| #include <linux/module.h> |
| #include <net/sock.h> |
| #include <linux/netfilter.h> |
| #include <linux/netfilter/x_tables.h> |
| #include <linux/netfilter_bridge/ebtables.h> |
| #include <linux/netfilter_bridge/ebt_nat.h> |
| |
| static unsigned int |
| ebt_dnat_tg(struct sk_buff *skb, const struct net_device *in, |
| const struct net_device *out, unsigned int hook_nr, |
| const struct xt_target *target, const void *data) |
| { |
| const struct ebt_nat_info *info = data; |
| |
| if (!skb_make_writable(skb, 0)) |
| return EBT_DROP; |
| |
| memcpy(eth_hdr(skb)->h_dest, info->mac, ETH_ALEN); |
| return info->target; |
| } |
| |
| static bool |
| ebt_dnat_tg_check(const char *tablename, const void *entry, |
| const struct xt_target *target, void *data, |
| unsigned int hookmask) |
| { |
| const struct ebt_nat_info *info = data; |
| |
| if (BASE_CHAIN && info->target == EBT_RETURN) |
| return false; |
| CLEAR_BASE_CHAIN_BIT; |
| if ( (strcmp(tablename, "nat") || |
| (hookmask & ~((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT)))) && |
| (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) ) |
| return false; |
| if (INVALID_TARGET) |
| return false; |
| return true; |
| } |
| |
| static struct ebt_target dnat __read_mostly = { |
| .name = EBT_DNAT_TARGET, |
| .revision = 0, |
| .family = NFPROTO_BRIDGE, |
| .target = ebt_dnat_tg, |
| .checkentry = ebt_dnat_tg_check, |
| .targetsize = XT_ALIGN(sizeof(struct ebt_nat_info)), |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init ebt_dnat_init(void) |
| { |
| return ebt_register_target(&dnat); |
| } |
| |
| static void __exit ebt_dnat_fini(void) |
| { |
| ebt_unregister_target(&dnat); |
| } |
| |
| module_init(ebt_dnat_init); |
| module_exit(ebt_dnat_fini); |
| MODULE_DESCRIPTION("Ebtables: Destination MAC address translation"); |
| MODULE_LICENSE("GPL"); |