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