| /* |
| * ebt_snat |
| * |
| * 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> |
| |
| static int ebt_target_snat(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_source, info->mac, |
| ETH_ALEN * sizeof(unsigned char)); |
| return info->target; |
| } |
| |
| static int ebt_target_snat_check(const char *tablename, unsigned int hookmask, |
| const struct ebt_entry *e, void *data, unsigned int datalen) |
| { |
| struct ebt_nat_info *info = (struct ebt_nat_info *) data; |
| |
| if (datalen != sizeof(struct ebt_nat_info)) |
| return -EINVAL; |
| if (BASE_CHAIN && info->target == EBT_RETURN) |
| return -EINVAL; |
| CLEAR_BASE_CHAIN_BIT; |
| if (strcmp(tablename, "nat")) |
| return -EINVAL; |
| if (hookmask & ~(1 << NF_BR_POST_ROUTING)) |
| return -EINVAL; |
| if (INVALID_TARGET) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static struct ebt_target snat = |
| { |
| .name = EBT_SNAT_TARGET, |
| .target = ebt_target_snat, |
| .check = ebt_target_snat_check, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init init(void) |
| { |
| return ebt_register_target(&snat); |
| } |
| |
| static void __exit fini(void) |
| { |
| ebt_unregister_target(&snat); |
| } |
| |
| module_init(init); |
| module_exit(fini); |
| MODULE_LICENSE("GPL"); |