diff options
Diffstat (limited to 'kernel/net/bridge/netfilter/ebt_dnat.c')
-rw-r--r-- | kernel/net/bridge/netfilter/ebt_dnat.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/kernel/net/bridge/netfilter/ebt_dnat.c b/kernel/net/bridge/netfilter/ebt_dnat.c new file mode 100644 index 000000000..4e0b0c359 --- /dev/null +++ b/kernel/net/bridge/netfilter/ebt_dnat.c @@ -0,0 +1,74 @@ +/* + * 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 xt_action_param *par) +{ + const struct ebt_nat_info *info = par->targinfo; + + if (!skb_make_writable(skb, 0)) + return EBT_DROP; + + ether_addr_copy(eth_hdr(skb)->h_dest, info->mac); + return info->target; +} + +static int ebt_dnat_tg_check(const struct xt_tgchk_param *par) +{ + const struct ebt_nat_info *info = par->targinfo; + unsigned int hook_mask; + + if (BASE_CHAIN && info->target == EBT_RETURN) + return -EINVAL; + + hook_mask = par->hook_mask & ~(1 << NF_BR_NUMHOOKS); + if ((strcmp(par->table, "nat") != 0 || + (hook_mask & ~((1 << NF_BR_PRE_ROUTING) | + (1 << NF_BR_LOCAL_OUT)))) && + (strcmp(par->table, "broute") != 0 || + hook_mask & ~(1 << NF_BR_BROUTING))) + return -EINVAL; + if (INVALID_TARGET) + return -EINVAL; + return 0; +} + +static struct xt_target ebt_dnat_tg_reg __read_mostly = { + .name = "dnat", + .revision = 0, + .family = NFPROTO_BRIDGE, + .hooks = (1 << NF_BR_NUMHOOKS) | (1 << NF_BR_PRE_ROUTING) | + (1 << NF_BR_LOCAL_OUT) | (1 << NF_BR_BROUTING), + .target = ebt_dnat_tg, + .checkentry = ebt_dnat_tg_check, + .targetsize = sizeof(struct ebt_nat_info), + .me = THIS_MODULE, +}; + +static int __init ebt_dnat_init(void) +{ + return xt_register_target(&ebt_dnat_tg_reg); +} + +static void __exit ebt_dnat_fini(void) +{ + xt_unregister_target(&ebt_dnat_tg_reg); +} + +module_init(ebt_dnat_init); +module_exit(ebt_dnat_fini); +MODULE_DESCRIPTION("Ebtables: Destination MAC address translation"); +MODULE_LICENSE("GPL"); |