[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / netfilter_bridge.h

#ifndef __LINUX_BRIDGE_NETFILTER_H
#define __LINUX_BRIDGE_NETFILTER_H

#include <uapi/linux/netfilter_bridge.h>


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;
};

static inline void br_drop_fake_rtable(struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);

	if (dst && (dst->flags & DST_FAKE_RTABLE))
		skb_dst_drop(skb);
}

#else
#define nf_bridge_maybe_copy_header(skb)	(0)
#define nf_bridge_pad(skb)			(0)
#define br_drop_fake_rtable(skb)	        do { } while (0)
#endif /* CONFIG_BRIDGE_NETFILTER */

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_BRIDGE_NETFILTER_H
	2	#define __LINUX_BRIDGE_NETFILTER_H
	3
607ca46e DH	4	#include <uapi/linux/netfilter_bridge.h>
607ca46e DH	5
1da177e4 LT	6
	7	enum nf_br_hook_priorities {
	8	NF_BR_PRI_FIRST = INT_MIN,
	9	NF_BR_PRI_NAT_DST_BRIDGED = -300,
	10	NF_BR_PRI_FILTER_BRIDGED = -200,
	11	NF_BR_PRI_BRNF = 0,
	12	NF_BR_PRI_NAT_DST_OTHER = 100,
	13	NF_BR_PRI_FILTER_OTHER = 200,
	14	NF_BR_PRI_NAT_SRC = 300,
	15	NF_BR_PRI_LAST = INT_MAX,
	16	};
	17
	18	#ifdef CONFIG_BRIDGE_NETFILTER
	19
	20	#define BRNF_PKT_TYPE 0x01
	21	#define BRNF_BRIDGED_DNAT 0x02
ea2d9b41 BDS	22	#define BRNF_BRIDGED 0x04
ea2d9b41 BDS	23	#define BRNF_NF_BRIDGE_PREROUTING 0x08
e179e632 BDS	24	#define BRNF_8021Q 0x10
e179e632 BDS	25	#define BRNF_PPPoE 0x20
1da177e4 LT	26
1da177e4 LT	27	/* Only used in br_forward.c */
07317621 SH	28	extern int nf_bridge_copy_header(struct sk_buff *skb);
07317621 SH	29	static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
1da177e4	30	{
4a9ecd59 PM	31	if (skb->nf_bridge &&
4a9ecd59 PM	32	skb->nf_bridge->mask & (BRNF_BRIDGED \| BRNF_BRIDGED_DNAT))
07317621 SH	33	return nf_bridge_copy_header(skb);
07317621 SH	34	return 0;
1da177e4 LT	35	}
1da177e4 LT	36
fc38582d PM	37	static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
	38	{
	39	switch (skb->protocol) {
f3a7c66b	40	case __cpu_to_be16(ETH_P_8021Q):
fc38582d	41	return VLAN_HLEN;
f3a7c66b	42	case __cpu_to_be16(ETH_P_PPP_SES):
fc38582d PM	43	return PPPOE_SES_HLEN;
	44	default:
	45	return 0;
	46	}
	47	}
	48
6c79bf0f BDS	49	static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
	50	{
	51	if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
	52	return PPPOE_SES_HLEN;
	53	return 0;
	54	}
	55
ea2d9b41 BDS	56	extern int br_handle_frame_finish(struct sk_buff *skb);
	57	/* Only used in br_device.c */
	58	static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
	59	{
	60	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
	61
	62	skb_pull(skb, ETH_HLEN);
	63	nf_bridge->mask ^= BRNF_BRIDGED_DNAT;
e179e632 BDS	64	skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
e179e632 BDS	65	skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
ea2d9b41 BDS	66	skb->dev = nf_bridge->physindev;
	67	return br_handle_frame_finish(skb);
	68	}
	69
1da177e4 LT	70	/* This is called by the IP fragmenting code and it ensures there is
1da177e4 LT	71	* enough room for the encapsulating header (if there is one). */
fc38582d	72	static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
1da177e4	73	{
fc38582d PM	74	if (skb->nf_bridge)
	75	return nf_bridge_encap_header_len(skb);
	76	return 0;
1da177e4 LT	77	}
	78
	79	struct bridge_skb_cb {
	80	union {
47c183fa	81	__be32 ipv4;
1da177e4 LT	82	} daddr;
1da177e4 LT	83	};
10ea6ac8	84
a881e963 PHP	85	static inline void br_drop_fake_rtable(struct sk_buff *skb)
	86	{
	87	struct dst_entry *dst = skb_dst(skb);
	88
	89	if (dst && (dst->flags & DST_FAKE_RTABLE))
	90	skb_dst_drop(skb);
	91	}
	92
07317621 SH	93	#else
07317621 SH	94	#define nf_bridge_maybe_copy_header(skb) (0)
9bcfcaf5	95	#define nf_bridge_pad(skb) (0)
a881e963	96	#define br_drop_fake_rtable(skb) do { } while (0)
1da177e4 LT	97	#endif /* CONFIG_BRIDGE_NETFILTER */
1da177e4 LT	98
1da177e4	99	#endif