[mirror_ubuntu-bionic-kernel.git] / include / linux / netfilter_bridge.h

#ifndef __LINUX_BRIDGE_NETFILTER_H
#define __LINUX_BRIDGE_NETFILTER_H

/* bridge-specific defines for netfilter. 
 */

#include <linux/netfilter.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>

/* 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


/* Only used in br_forward.c */
extern int nf_bridge_copy_header(struct sk_buff *skb);
static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
{
	if (skb->nf_bridge)
		return nf_bridge_copy_header(skb);
  	return 0;
}

/* 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(const struct sk_buff *skb)
{
 	return (skb->nf_bridge && skb->protocol == htons(ETH_P_8021Q))
		? VLAN_HLEN : 0;
}

struct bridge_skb_cb {
	union {
		__u32 ipv4;
	} daddr;
};

extern int brnf_deferred_hooks;
#else
#define nf_bridge_maybe_copy_header(skb)	(0)
#define nf_bridge_pad(skb)			(0)
#endif /* CONFIG_BRIDGE_NETFILTER */

#endif /* __KERNEL__ */
#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_BRIDGE_NETFILTER_H
	2	#define __LINUX_BRIDGE_NETFILTER_H
	3
	4	/* bridge-specific defines for netfilter.
	5	*/
	6
1da177e4	7	#include <linux/netfilter.h>
1da177e4	8	#include <linux/if_ether.h>
9bcfcaf5	9	#include <linux/if_vlan.h>
1da177e4 LT	10
	11	/* Bridge Hooks */
	12	/* After promisc drops, checksum checks. */
	13	#define NF_BR_PRE_ROUTING 0
	14	/* If the packet is destined for this box. */
	15	#define NF_BR_LOCAL_IN 1
	16	/* If the packet is destined for another interface. */
	17	#define NF_BR_FORWARD 2
	18	/* Packets coming from a local process. */
	19	#define NF_BR_LOCAL_OUT 3
	20	/* Packets about to hit the wire. */
	21	#define NF_BR_POST_ROUTING 4
	22	/* Not really a hook, but used for the ebtables broute table */
	23	#define NF_BR_BROUTING 5
	24	#define NF_BR_NUMHOOKS 6
	25
	26	#ifdef __KERNEL__
	27
	28	enum nf_br_hook_priorities {
	29	NF_BR_PRI_FIRST = INT_MIN,
	30	NF_BR_PRI_NAT_DST_BRIDGED = -300,
	31	NF_BR_PRI_FILTER_BRIDGED = -200,
	32	NF_BR_PRI_BRNF = 0,
	33	NF_BR_PRI_NAT_DST_OTHER = 100,
	34	NF_BR_PRI_FILTER_OTHER = 200,
	35	NF_BR_PRI_NAT_SRC = 300,
	36	NF_BR_PRI_LAST = INT_MAX,
	37	};
	38
	39	#ifdef CONFIG_BRIDGE_NETFILTER
	40
	41	#define BRNF_PKT_TYPE 0x01
	42	#define BRNF_BRIDGED_DNAT 0x02
	43	#define BRNF_DONT_TAKE_PARENT 0x04
	44	#define BRNF_BRIDGED 0x08
	45	#define BRNF_NF_BRIDGE_PREROUTING 0x10
	46
1da177e4 LT	47
1da177e4 LT	48	/* Only used in br_forward.c */
07317621 SH	49	extern int nf_bridge_copy_header(struct sk_buff *skb);
07317621 SH	50	static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
1da177e4	51	{
07317621 SH	52	if (skb->nf_bridge)
	53	return nf_bridge_copy_header(skb);
	54	return 0;
1da177e4 LT	55	}
1da177e4 LT	56
1da177e4 LT	57	/* This is called by the IP fragmenting code and it ensures there is
1da177e4 LT	58	* enough room for the encapsulating header (if there is one). */
9bcfcaf5	59	static inline int nf_bridge_pad(const struct sk_buff *skb)
1da177e4	60	{
9bcfcaf5 SH	61	return (skb->nf_bridge && skb->protocol == htons(ETH_P_8021Q))
9bcfcaf5 SH	62	? VLAN_HLEN : 0;
1da177e4 LT	63	}
	64
	65	struct bridge_skb_cb {
	66	union {
	67	__u32 ipv4;
	68	} daddr;
	69	};
10ea6ac8 PM	70
10ea6ac8 PM	71	extern int brnf_deferred_hooks;
07317621 SH	72	#else
07317621 SH	73	#define nf_bridge_maybe_copy_header(skb) (0)
9bcfcaf5	74	#define nf_bridge_pad(skb) (0)
1da177e4 LT	75	#endif /* CONFIG_BRIDGE_NETFILTER */
	76
	77	#endif /* __KERNEL__ */
	78	#endif