| /* |
| * ebt_redirect |
| * |
| * Authors: |
| * Bart De Schuymer <bdschuym@pandora.be> |
| * |
| * April, 2002 |
| * |
| */ |
| |
| #include <linux/netfilter.h> |
| #include <linux/netfilter_bridge/ebtables.h> |
| #include <linux/netfilter_bridge/ebt_redirect.h> |
| #include <linux/module.h> |
| #include <net/sock.h> |
| #include "../br_private.h" |
| |
| static int ebt_target_redirect(struct sk_buff *skb, unsigned int hooknr, |
| const struct net_device *in, const struct net_device *out, |
| const void *data, unsigned int datalen) |
| { |
| const struct ebt_redirect_info *info = data; |
| |
| if (skb_make_writable(skb, 0)) |
| return NF_DROP; |
| |
| if (hooknr != NF_BR_BROUTING) |
| memcpy(eth_hdr(skb)->h_dest, |
| in->br_port->br->dev->dev_addr, ETH_ALEN); |
| else |
| memcpy(eth_hdr(skb)->h_dest, in->dev_addr, ETH_ALEN); |
| skb->pkt_type = PACKET_HOST; |
| return info->target; |
| } |
| |
| static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask, |
| const struct ebt_entry *e, void *data, unsigned int datalen) |
| { |
| const struct ebt_redirect_info *info = data; |
| |
| if (datalen != EBT_ALIGN(sizeof(struct ebt_redirect_info))) |
| return -EINVAL; |
| if (BASE_CHAIN && info->target == EBT_RETURN) |
| return -EINVAL; |
| CLEAR_BASE_CHAIN_BIT; |
| if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) && |
| (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) ) |
| return -EINVAL; |
| if (INVALID_TARGET) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static struct ebt_target redirect_target = |
| { |
| .name = EBT_REDIRECT_TARGET, |
| .target = ebt_target_redirect, |
| .check = ebt_target_redirect_check, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init ebt_redirect_init(void) |
| { |
| return ebt_register_target(&redirect_target); |
| } |
| |
| static void __exit ebt_redirect_fini(void) |
| { |
| ebt_unregister_target(&redirect_target); |
| } |
| |
| module_init(ebt_redirect_init); |
| module_exit(ebt_redirect_fini); |
| MODULE_DESCRIPTION("Ebtables: Packet redirection to localhost"); |
| MODULE_LICENSE("GPL"); |