[net-next-2.6.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>
#include <linux/if_pppox.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_BRIDGED			0x04
#define BRNF_NF_BRIDGE_PREROUTING	0x08
#define BRNF_8021Q			0x10
#define BRNF_PPPoE			0x20

/* 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 &&
	    skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
		return nf_bridge_copy_header(skb);
  	return 0;
}

static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
{
	switch (skb->protocol) {
	case __cpu_to_be16(ETH_P_8021Q):
		return VLAN_HLEN;
	case __cpu_to_be16(ETH_P_PPP_SES):
		return PPPOE_SES_HLEN;
	default:
		return 0;
	}
}

static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
{
	if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
		return PPPOE_SES_HLEN;
	return 0;
}

extern int br_handle_frame_finish(struct sk_buff *skb);
/* Only used in br_device.c */
static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
{
	struct nf_bridge_info *nf_bridge = skb->nf_bridge;

	skb_pull(skb, ETH_HLEN);
	nf_bridge->mask ^= BRNF_BRIDGED_DNAT;
	skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
				       skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
	skb->dev = nf_bridge->physindev;
	return br_handle_frame_finish(skb);
}

/* 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 unsigned int nf_bridge_pad(const struct sk_buff *skb)
{
	if (skb->nf_bridge)
		return nf_bridge_encap_header_len(skb);
	return 0;
}

struct bridge_skb_cb {
	union {
		__be32 ipv4;
	} daddr;
};

#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>
516299d2	10	#include <linux/if_pppox.h>
1da177e4 LT	11
	12	/* Bridge Hooks */
	13	/* After promisc drops, checksum checks. */
	14	#define NF_BR_PRE_ROUTING 0
	15	/* If the packet is destined for this box. */
	16	#define NF_BR_LOCAL_IN 1
	17	/* If the packet is destined for another interface. */
	18	#define NF_BR_FORWARD 2
	19	/* Packets coming from a local process. */
	20	#define NF_BR_LOCAL_OUT 3
	21	/* Packets about to hit the wire. */
	22	#define NF_BR_POST_ROUTING 4
	23	/* Not really a hook, but used for the ebtables broute table */
	24	#define NF_BR_BROUTING 5
	25	#define NF_BR_NUMHOOKS 6
	26
	27	#ifdef __KERNEL__
	28
	29	enum nf_br_hook_priorities {
	30	NF_BR_PRI_FIRST = INT_MIN,
	31	NF_BR_PRI_NAT_DST_BRIDGED = -300,
	32	NF_BR_PRI_FILTER_BRIDGED = -200,
	33	NF_BR_PRI_BRNF = 0,
	34	NF_BR_PRI_NAT_DST_OTHER = 100,
	35	NF_BR_PRI_FILTER_OTHER = 200,
	36	NF_BR_PRI_NAT_SRC = 300,
	37	NF_BR_PRI_LAST = INT_MAX,
	38	};
	39
	40	#ifdef CONFIG_BRIDGE_NETFILTER
	41
	42	#define BRNF_PKT_TYPE 0x01
	43	#define BRNF_BRIDGED_DNAT 0x02
ea2d9b41 BDS	44	#define BRNF_BRIDGED 0x04
ea2d9b41 BDS	45	#define BRNF_NF_BRIDGE_PREROUTING 0x08
e179e632 BDS	46	#define BRNF_8021Q 0x10
e179e632 BDS	47	#define BRNF_PPPoE 0x20
1da177e4 LT	48
1da177e4 LT	49	/* Only used in br_forward.c */
07317621 SH	50	extern int nf_bridge_copy_header(struct sk_buff *skb);
07317621 SH	51	static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
1da177e4	52	{
4a9ecd59 PM	53	if (skb->nf_bridge &&
4a9ecd59 PM	54	skb->nf_bridge->mask & (BRNF_BRIDGED \| BRNF_BRIDGED_DNAT))
07317621 SH	55	return nf_bridge_copy_header(skb);
07317621 SH	56	return 0;
1da177e4 LT	57	}
1da177e4 LT	58
fc38582d PM	59	static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
	60	{
	61	switch (skb->protocol) {
f3a7c66b	62	case __cpu_to_be16(ETH_P_8021Q):
fc38582d	63	return VLAN_HLEN;
f3a7c66b	64	case __cpu_to_be16(ETH_P_PPP_SES):
fc38582d PM	65	return PPPOE_SES_HLEN;
	66	default:
	67	return 0;
	68	}
	69	}
	70
6c79bf0f BDS	71	static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
	72	{
	73	if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
	74	return PPPOE_SES_HLEN;
	75	return 0;
	76	}
	77
ea2d9b41 BDS	78	extern int br_handle_frame_finish(struct sk_buff *skb);
	79	/* Only used in br_device.c */
	80	static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
	81	{
	82	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
	83
	84	skb_pull(skb, ETH_HLEN);
	85	nf_bridge->mask ^= BRNF_BRIDGED_DNAT;
e179e632 BDS	86	skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
e179e632 BDS	87	skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
ea2d9b41 BDS	88	skb->dev = nf_bridge->physindev;
	89	return br_handle_frame_finish(skb);
	90	}
	91
1da177e4 LT	92	/* This is called by the IP fragmenting code and it ensures there is
1da177e4 LT	93	* enough room for the encapsulating header (if there is one). */
fc38582d	94	static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
1da177e4	95	{
fc38582d PM	96	if (skb->nf_bridge)
	97	return nf_bridge_encap_header_len(skb);
	98	return 0;
1da177e4 LT	99	}
	100
	101	struct bridge_skb_cb {
	102	union {
47c183fa	103	__be32 ipv4;
1da177e4 LT	104	} daddr;
1da177e4 LT	105	};
10ea6ac8	106
07317621 SH	107	#else
07317621 SH	108	#define nf_bridge_maybe_copy_header(skb) (0)
9bcfcaf5	109	#define nf_bridge_pad(skb) (0)
1da177e4 LT	110	#endif /* CONFIG_BRIDGE_NETFILTER */
	111
	112	#endif /* __KERNEL__ */
	113	#endif