[deliverable/linux.git] / include / net / lwtunnel.h

#ifndef __NET_LWTUNNEL_H
#define __NET_LWTUNNEL_H 1

#include <linux/lwtunnel.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <net/route.h>

#define LWTUNNEL_HASH_BITS   7
#define LWTUNNEL_HASH_SIZE   (1 << LWTUNNEL_HASH_BITS)

/* lw tunnel state flags */
#define LWTUNNEL_STATE_OUTPUT_REDIRECT	BIT(0)
#define LWTUNNEL_STATE_INPUT_REDIRECT	BIT(1)
#define LWTUNNEL_STATE_XMIT_REDIRECT	BIT(2)

enum {
	LWTUNNEL_XMIT_DONE,
	LWTUNNEL_XMIT_CONTINUE,
};


struct lwtunnel_state {
	__u16		type;
	__u16		flags;
	atomic_t	refcnt;
	int		(*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
	int		(*orig_input)(struct sk_buff *);
	int             len;
	__u16		headroom;
	__u8            data[0];
};

struct lwtunnel_encap_ops {
	int (*build_state)(struct net_device *dev, struct nlattr *encap,
			   unsigned int family, const void *cfg,
			   struct lwtunnel_state **ts);
	int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
	int (*input)(struct sk_buff *skb);
	int (*fill_encap)(struct sk_buff *skb,
			  struct lwtunnel_state *lwtstate);
	int (*get_encap_size)(struct lwtunnel_state *lwtstate);
	int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
	int (*xmit)(struct sk_buff *skb);
};

#ifdef CONFIG_LWTUNNEL
static inline void lwtstate_free(struct lwtunnel_state *lws)
{
	kfree(lws);
}

static inline struct lwtunnel_state *
lwtstate_get(struct lwtunnel_state *lws)
{
	if (lws)
		atomic_inc(&lws->refcnt);

	return lws;
}

static inline void lwtstate_put(struct lwtunnel_state *lws)
{
	if (!lws)
		return;

	if (atomic_dec_and_test(&lws->refcnt))
		lwtstate_free(lws);
}

static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
{
	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
		return true;

	return false;
}

static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
{
	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
		return true;

	return false;
}

static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
{
	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
		return true;

	return false;
}

static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
					     unsigned int mtu)
{
	if (lwtunnel_xmit_redirect(lwtstate) && lwtstate->headroom < mtu)
		return lwtstate->headroom;

	return 0;
}

int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
			   unsigned int num);
int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
			   unsigned int num);
int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
			 struct nlattr *encap,
			 unsigned int family, const void *cfg,
			 struct lwtunnel_state **lws);
int lwtunnel_fill_encap(struct sk_buff *skb,
			struct lwtunnel_state *lwtstate);
int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int lwtunnel_input(struct sk_buff *skb);
int lwtunnel_xmit(struct sk_buff *skb);

#else

static inline void lwtstate_free(struct lwtunnel_state *lws)
{
}

static inline struct lwtunnel_state *
lwtstate_get(struct lwtunnel_state *lws)
{
	return lws;
}

static inline void lwtstate_put(struct lwtunnel_state *lws)
{
}

static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
{
	return false;
}

static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
{
	return false;
}

static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
{
	return false;
}

static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
					     unsigned int mtu)
{
	return 0;
}

static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
					 unsigned int num)
{
	return -EOPNOTSUPP;

}

static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
					 unsigned int num)
{
	return -EOPNOTSUPP;
}

static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
				       struct nlattr *encap,
				       unsigned int family, const void *cfg,
				       struct lwtunnel_state **lws)
{
	return -EOPNOTSUPP;
}

static inline int lwtunnel_fill_encap(struct sk_buff *skb,
				      struct lwtunnel_state *lwtstate)
{
	return 0;
}

static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
{
	return 0;
}

static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
{
	return NULL;
}

static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
				     struct lwtunnel_state *b)
{
	return 0;
}

static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	return -EOPNOTSUPP;
}

static inline int lwtunnel_input(struct sk_buff *skb)
{
	return -EOPNOTSUPP;
}

static inline int lwtunnel_xmit(struct sk_buff *skb)
{
	return -EOPNOTSUPP;
}

#endif /* CONFIG_LWTUNNEL */

#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))

#endif /* __NET_LWTUNNEL_H */
Commit	Line	Data
499a2425 RP	1	#ifndef __NET_LWTUNNEL_H
	2	#define __NET_LWTUNNEL_H 1
	3
	4	#include <linux/lwtunnel.h>
	5	#include <linux/netdevice.h>
	6	#include <linux/skbuff.h>
	7	#include <linux/types.h>
	8	#include <net/route.h>
	9
	10	#define LWTUNNEL_HASH_BITS 7
	11	#define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS)
	12
	13	/* lw tunnel state flags */
25368623 TH	14	#define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0)
25368623 TH	15	#define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1)
14972cbd RP	16	#define LWTUNNEL_STATE_XMIT_REDIRECT BIT(2)
	17
	18	enum {
	19	LWTUNNEL_XMIT_DONE,
	20	LWTUNNEL_XMIT_CONTINUE,
	21	};
	22
499a2425 RP	23
	24	struct lwtunnel_state {
	25	__u16 type;
	26	__u16 flags;
	27	atomic_t refcnt;
ede2059d	28	int (orig_output)(struct net net, struct sock sk, struct sk_buff skb);
25368623	29	int (orig_input)(struct sk_buff );
499a2425	30	int len;
14972cbd	31	__u16 headroom;
499a2425 RP	32	__u8 data[0];
	33	};
	34
	35	struct lwtunnel_encap_ops {
	36	int (build_state)(struct net_device dev, struct nlattr *encap,
127eb7cd	37	unsigned int family, const void *cfg,
499a2425	38	struct lwtunnel_state **ts);
ede2059d	39	int (output)(struct net net, struct sock sk, struct sk_buff skb);
25368623	40	int (input)(struct sk_buff skb);
499a2425 RP	41	int (fill_encap)(struct sk_buff skb,
	42	struct lwtunnel_state *lwtstate);
	43	int (get_encap_size)(struct lwtunnel_state lwtstate);
	44	int (cmp_encap)(struct lwtunnel_state a, struct lwtunnel_state *b);
14972cbd	45	int (xmit)(struct sk_buff skb);
499a2425 RP	46	};
499a2425 RP	47
499a2425	48	#ifdef CONFIG_LWTUNNEL
df383e62 JB	49	static inline void lwtstate_free(struct lwtunnel_state *lws)
	50	{
	51	kfree(lws);
	52	}
	53
5a6228a0 ND	54	static inline struct lwtunnel_state *
5a6228a0 ND	55	lwtstate_get(struct lwtunnel_state *lws)
499a2425	56	{
5a6228a0 ND	57	if (lws)
	58	atomic_inc(&lws->refcnt);
	59
	60	return lws;
499a2425 RP	61	}
499a2425 RP	62
5a6228a0	63	static inline void lwtstate_put(struct lwtunnel_state *lws)
499a2425 RP	64	{
	65	if (!lws)
	66	return;
	67
	68	if (atomic_dec_and_test(&lws->refcnt))
df383e62	69	lwtstate_free(lws);
499a2425 RP	70	}
	71
	72	static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
	73	{
	74	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
	75	return true;
	76
	77	return false;
	78	}
	79
25368623 TH	80	static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
	81	{
	82	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
	83	return true;
	84
	85	return false;
	86	}
14972cbd RP	87
	88	static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
	89	{
	90	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
	91	return true;
	92
	93	return false;
	94	}
	95
	96	static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
	97	unsigned int mtu)
	98	{
	99	if (lwtunnel_xmit_redirect(lwtstate) && lwtstate->headroom < mtu)
	100	return lwtstate->headroom;
	101
	102	return 0;
	103	}
	104
499a2425 RP	105	int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
	106	unsigned int num);
	107	int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
	108	unsigned int num);
	109	int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
	110	struct nlattr *encap,
127eb7cd	111	unsigned int family, const void *cfg,
499a2425 RP	112	struct lwtunnel_state **lws);
	113	int lwtunnel_fill_encap(struct sk_buff *skb,
	114	struct lwtunnel_state *lwtstate);
	115	int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
	116	struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
	117	int lwtunnel_cmp_encap(struct lwtunnel_state a, struct lwtunnel_state b);
ede2059d	118	int lwtunnel_output(struct net net, struct sock sk, struct sk_buff *skb);
25368623	119	int lwtunnel_input(struct sk_buff *skb);
14972cbd	120	int lwtunnel_xmit(struct sk_buff *skb);
499a2425 RP	121
	122	#else
	123
824e7383 YX	124	static inline void lwtstate_free(struct lwtunnel_state *lws)
	125	{
	126	}
	127
5a6228a0 ND	128	static inline struct lwtunnel_state *
5a6228a0 ND	129	lwtstate_get(struct lwtunnel_state *lws)
499a2425	130	{
5a6228a0	131	return lws;
499a2425 RP	132	}
499a2425 RP	133
5a6228a0	134	static inline void lwtstate_put(struct lwtunnel_state *lws)
499a2425 RP	135	{
	136	}
	137
	138	static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
	139	{
	140	return false;
	141	}
	142
25368623 TH	143	static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
	144	{
	145	return false;
	146	}
	147
14972cbd RP	148	static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
	149	{
	150	return false;
	151	}
	152
	153	static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
	154	unsigned int mtu)
	155	{
	156	return 0;
	157	}
	158
499a2425 RP	159	static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
	160	unsigned int num)
	161	{
	162	return -EOPNOTSUPP;
	163
	164	}
	165
	166	static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
	167	unsigned int num)
	168	{
	169	return -EOPNOTSUPP;
	170	}
	171
	172	static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
	173	struct nlattr *encap,
127eb7cd	174	unsigned int family, const void *cfg,
499a2425 RP	175	struct lwtunnel_state **lws)
	176	{
	177	return -EOPNOTSUPP;
	178	}
	179
	180	static inline int lwtunnel_fill_encap(struct sk_buff *skb,
	181	struct lwtunnel_state *lwtstate)
	182	{
	183	return 0;
	184	}
	185
	186	static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
	187	{
	188	return 0;
	189	}
	190
	191	static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
	192	{
	193	return NULL;
	194	}
	195
	196	static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
	197	struct lwtunnel_state *b)
	198	{
	199	return 0;
	200	}
	201
ede2059d	202	static inline int lwtunnel_output(struct net net, struct sock sk, struct sk_buff *skb)
ffce4196 RP	203	{
	204	return -EOPNOTSUPP;
	205	}
	206
25368623 TH	207	static inline int lwtunnel_input(struct sk_buff *skb)
	208	{
	209	return -EOPNOTSUPP;
	210	}
	211
14972cbd RP	212	static inline int lwtunnel_xmit(struct sk_buff *skb)
	213	{
	214	return -EOPNOTSUPP;
	215	}
	216
745041e2 RS	217	#endif /* CONFIG_LWTUNNEL */
	218
	219	#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
499a2425 RP	220
499a2425 RP	221	#endif /* __NET_LWTUNNEL_H */