diff options
Diffstat (limited to 'net/bridge/netfilter/ebt_dnat.c')
-rw-r--r-- | net/bridge/netfilter/ebt_dnat.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/net/bridge/netfilter/ebt_dnat.c b/net/bridge/netfilter/ebt_dnat.c new file mode 100644 index 0000000..f546308 --- /dev/null +++ b/net/bridge/netfilter/ebt_dnat.c @@ -0,0 +1,76 @@ +/* + * 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; + + if (skb_shared(*pskb) || skb_cloned(*pskb)) { + struct sk_buff *nskb; + + nskb = skb_copy(*pskb, GFP_ATOMIC); + if (!nskb) + return NF_DROP; + if ((*pskb)->sk) + skb_set_owner_w(nskb, (*pskb)->sk); + kfree_skb(*pskb); + *pskb = nskb; + } + memcpy(eth_hdr(*pskb)->h_dest, info->mac, ETH_ALEN); + return info->target; +} + +static int ebt_target_dnat_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 (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 != EBT_ALIGN(sizeof(struct ebt_nat_info))) + 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, +}; + +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"); |