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#ifndef __LINUX_BRIDGE_NETFILTER_H
#define __LINUX_BRIDGE_NETFILTER_H
/* bridge-specific defines for netfilter.
*/
#include <linux/config.h>
#include <linux/netfilter.h>
#if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER)
#include <asm/atomic.h>
#include <linux/if_ether.h>
#endif
/* Bridge Hooks */
/* After promisc drops, checksum checks. */
#define NF_BR_PRE_ROUTING 0
/* If the packet is destined for this box. */
#define NF_BR_LOCAL_IN 1
/* If the packet is destined for another interface. */
#define NF_BR_FORWARD 2
/* Packets coming from a local process. */
#define NF_BR_LOCAL_OUT 3
/* Packets about to hit the wire. */
#define NF_BR_POST_ROUTING 4
/* Not really a hook, but used for the ebtables broute table */
#define NF_BR_BROUTING 5
#define NF_BR_NUMHOOKS 6
#ifdef __KERNEL__
enum nf_br_hook_priorities {
NF_BR_PRI_FIRST = INT_MIN,
NF_BR_PRI_NAT_DST_BRIDGED = -300,
NF_BR_PRI_FILTER_BRIDGED = -200,
NF_BR_PRI_BRNF = 0,
NF_BR_PRI_NAT_DST_OTHER = 100,
NF_BR_PRI_FILTER_OTHER = 200,
NF_BR_PRI_NAT_SRC = 300,
NF_BR_PRI_LAST = INT_MAX,
};
#ifdef CONFIG_BRIDGE_NETFILTER
#define BRNF_PKT_TYPE 0x01
#define BRNF_BRIDGED_DNAT 0x02
#define BRNF_DONT_TAKE_PARENT 0x04
#define BRNF_BRIDGED 0x08
#define BRNF_NF_BRIDGE_PREROUTING 0x10
static inline
struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
{
struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
atomic_set(&(*nf_bridge)->use, 1);
(*nf_bridge)->mask = 0;
(*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
(*nf_bridge)->netoutdev = NULL;
#endif
}
return *nf_bridge;
}
/* Only used in br_forward.c */
static inline
void nf_bridge_maybe_copy_header(struct sk_buff *skb)
{
if (skb->nf_bridge) {
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
memcpy(skb->data - 18, skb->nf_bridge->data, 18);
skb_push(skb, 4);
} else
memcpy(skb->data - 16, skb->nf_bridge->data, 16);
}
}
static inline
void nf_bridge_save_header(struct sk_buff *skb)
{
int header_size = 16;
if (skb->protocol == __constant_htons(ETH_P_8021Q))
header_size = 18;
memcpy(skb->nf_bridge->data, skb->data - header_size, header_size);
}
/* This is called by the IP fragmenting code and it ensures there is
* enough room for the encapsulating header (if there is one). */
static inline
int nf_bridge_pad(struct sk_buff *skb)
{
if (skb->protocol == __constant_htons(ETH_P_IP))
return 0;
if (skb->nf_bridge) {
if (skb->protocol == __constant_htons(ETH_P_8021Q))
return 4;
}
return 0;
}
struct bridge_skb_cb {
union {
__u32 ipv4;
} daddr;
};
#endif /* CONFIG_BRIDGE_NETFILTER */
#endif /* __KERNEL__ */
#endif
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