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85 lines
2 KiB
C
85 lines
2 KiB
C
#ifndef __LINUX_BRIDGE_NETFILTER_H
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#define __LINUX_BRIDGE_NETFILTER_H
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/* bridge-specific defines for netfilter.
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*/
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#include <linux/netfilter.h>
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#if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER)
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#include <asm/atomic.h>
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#include <linux/if_ether.h>
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#endif
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/* Bridge Hooks */
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/* After promisc drops, checksum checks. */
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#define NF_BR_PRE_ROUTING 0
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/* If the packet is destined for this box. */
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#define NF_BR_LOCAL_IN 1
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/* If the packet is destined for another interface. */
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#define NF_BR_FORWARD 2
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/* Packets coming from a local process. */
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#define NF_BR_LOCAL_OUT 3
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/* Packets about to hit the wire. */
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#define NF_BR_POST_ROUTING 4
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/* Not really a hook, but used for the ebtables broute table */
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#define NF_BR_BROUTING 5
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#define NF_BR_NUMHOOKS 6
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#ifdef __KERNEL__
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enum nf_br_hook_priorities {
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NF_BR_PRI_FIRST = INT_MIN,
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NF_BR_PRI_NAT_DST_BRIDGED = -300,
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NF_BR_PRI_FILTER_BRIDGED = -200,
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NF_BR_PRI_BRNF = 0,
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NF_BR_PRI_NAT_DST_OTHER = 100,
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NF_BR_PRI_FILTER_OTHER = 200,
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NF_BR_PRI_NAT_SRC = 300,
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NF_BR_PRI_LAST = INT_MAX,
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};
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#ifdef CONFIG_BRIDGE_NETFILTER
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#define BRNF_PKT_TYPE 0x01
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#define BRNF_BRIDGED_DNAT 0x02
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#define BRNF_DONT_TAKE_PARENT 0x04
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#define BRNF_BRIDGED 0x08
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#define BRNF_NF_BRIDGE_PREROUTING 0x10
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/* Only used in br_forward.c */
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static inline
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void nf_bridge_maybe_copy_header(struct sk_buff *skb)
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{
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if (skb->nf_bridge) {
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if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
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memcpy(skb->data - 18, skb->nf_bridge->data, 18);
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skb_push(skb, 4);
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} else
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memcpy(skb->data - 16, skb->nf_bridge->data, 16);
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}
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}
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/* This is called by the IP fragmenting code and it ensures there is
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* enough room for the encapsulating header (if there is one). */
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static inline
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int nf_bridge_pad(struct sk_buff *skb)
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{
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if (skb->protocol == __constant_htons(ETH_P_IP))
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return 0;
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if (skb->nf_bridge) {
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if (skb->protocol == __constant_htons(ETH_P_8021Q))
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return 4;
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}
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return 0;
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}
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struct bridge_skb_cb {
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union {
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__u32 ipv4;
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} daddr;
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};
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#endif /* CONFIG_BRIDGE_NETFILTER */
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#endif /* __KERNEL__ */
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#endif
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