| /* |
| * ebt_dnat |
| * |
| * Authors: |
| * Bart De Schuymer <bdschuym@pandora.be> |
| * |
| * June, 2002 |
| * |
| */ |
| |
| #include <linux/netfilter_bridge/ebtables.h> |
| #include <linux/netfilter_bridge/ebt_nat.h> |
| #include <linux/module.h> |
| #include <net/sock.h> |
| |
| static int ebt_target_dnat(struct sk_buff **pskb, unsigned int hooknr, |
| const struct net_device *in, const struct net_device *out, |
| const void *data, unsigned int datalen) |
| { |
| struct ebt_nat_info *info = (struct ebt_nat_info *)data; |
| |
| memcpy(((**pskb).mac.ethernet)->h_dest, info->mac, |
| ETH_ALEN * sizeof(unsigned char)); |
| return info->target; |
| } |
| |
| static struct ebt_target dnat; |
| static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask, |
| const struct ebt_entry *e, void *data, unsigned int datalen, |
| unsigned int version) |
| { |
| struct ebt_nat_info *info = (struct ebt_nat_info *)data; |
| |
| if (BASE_CHAIN && info->target == EBT_RETURN) |
| return -EINVAL; |
| 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 -EINVAL; |
| if (datalen != sizeof(struct ebt_nat_info)) |
| return -EINVAL; |
| if (ebt_check_version(version, dnat.version, dnat.name)) |
| return -EINVAL; |
| if (INVALID_TARGET) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static struct ebt_target dnat = |
| { |
| .name = EBT_DNAT_TARGET, |
| .target = ebt_target_dnat, |
| .check = ebt_target_dnat_check, |
| .me = THIS_MODULE, |
| .version = VERSIONIZE(1,0), |
| }; |
| |
| static int __init init(void) |
| { |
| return ebt_register_target(&dnat); |
| } |
| |
| static void __exit fini(void) |
| { |
| ebt_unregister_target(&dnat); |
| } |
| |
| module_init(init); |
| module_exit(fini); |
| MODULE_LICENSE("GPL"); |