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- /*
- * ebt_redirect
- *
- * Authors:
- * Bart De Schuymer <bdschuym@pandora.be>
- *
- * April, 2002
- *
- */
- #include <linux/module.h>
- #include <net/sock.h>
- #include "../br_private.h"
- #include <linux/netfilter.h>
- #include <linux/netfilter/x_tables.h>
- #include <linux/netfilter_bridge/ebtables.h>
- #include <linux/netfilter_bridge/ebt_redirect.h>
- static unsigned int
- ebt_redirect_tg(struct sk_buff *skb, const struct xt_action_param *par)
- {
- const struct ebt_redirect_info *info = par->targinfo;
- if (!skb_make_writable(skb, 0))
- return EBT_DROP;
- if (par->hooknum != NF_BR_BROUTING)
- /* rcu_read_lock()ed by nf_hook_slow */
- ether_addr_copy(eth_hdr(skb)->h_dest,
- br_port_get_rcu(par->in)->br->dev->dev_addr);
- else
- ether_addr_copy(eth_hdr(skb)->h_dest, par->in->dev_addr);
- skb->pkt_type = PACKET_HOST;
- return info->target;
- }
- static int ebt_redirect_tg_check(const struct xt_tgchk_param *par)
- {
- const struct ebt_redirect_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)) &&
- (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_redirect_tg_reg __read_mostly = {
- .name = "redirect",
- .revision = 0,
- .family = NFPROTO_BRIDGE,
- .hooks = (1 << NF_BR_NUMHOOKS) | (1 << NF_BR_PRE_ROUTING) |
- (1 << NF_BR_BROUTING),
- .target = ebt_redirect_tg,
- .checkentry = ebt_redirect_tg_check,
- .targetsize = sizeof(struct ebt_redirect_info),
- .me = THIS_MODULE,
- };
- static int __init ebt_redirect_init(void)
- {
- return xt_register_target(&ebt_redirect_tg_reg);
- }
- static void __exit ebt_redirect_fini(void)
- {
- xt_unregister_target(&ebt_redirect_tg_reg);
- }
- module_init(ebt_redirect_init);
- module_exit(ebt_redirect_fini);
- MODULE_DESCRIPTION("Ebtables: Packet redirection to localhost");
- MODULE_LICENSE("GPL");
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