[mirror_ubuntu-bionic-kernel.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;
	__u16		headroom;
	atomic_t	refcnt;
	int		(*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
	int		(*orig_input)(struct sk_buff *);
	struct		rcu_head rcu;
	__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);
	void (*destroy_state)(struct lwtunnel_state *lws);
	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);

	struct module *owner;
};

#ifdef CONFIG_LWTUNNEL
void lwtstate_free(struct lwtunnel_state *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) ||
	     lwtunnel_output_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_valid_encap_type(u16 encap_type);
int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len);
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_valid_encap_type(u16 encap_type)
{
	return -EOPNOTSUPP;
}
static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len)
{
	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;
f76a9db3	27	__u16 headroom;
499a2425	28	atomic_t refcnt;
ede2059d	29	int (orig_output)(struct net net, struct sock sk, struct sk_buff skb);
25368623	30	int (orig_input)(struct sk_buff );
1104d9ba	31	struct rcu_head rcu;
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);
1104d9ba	39	void (destroy_state)(struct lwtunnel_state lws);
ede2059d	40	int (output)(struct net net, struct sock sk, struct sk_buff skb);
25368623	41	int (input)(struct sk_buff skb);
499a2425 RP	42	int (fill_encap)(struct sk_buff skb,
	43	struct lwtunnel_state *lwtstate);
	44	int (get_encap_size)(struct lwtunnel_state lwtstate);
	45	int (cmp_encap)(struct lwtunnel_state a, struct lwtunnel_state *b);
14972cbd	46	int (xmit)(struct sk_buff skb);
88ff7334 RS	47
88ff7334 RS	48	struct module *owner;
499a2425 RP	49	};
499a2425 RP	50
499a2425	51	#ifdef CONFIG_LWTUNNEL
1104d9ba	52	void lwtstate_free(struct lwtunnel_state *lws);
df383e62	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	{
a23a8f5b DL	99	if ((lwtunnel_xmit_redirect(lwtstate) \|\|
a23a8f5b DL	100	lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu)
14972cbd RP	101	return lwtstate->headroom;
	102
	103	return 0;
	104	}
	105
499a2425 RP	106	int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
	107	unsigned int num);
	108	int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
	109	unsigned int num);
9ed59592 DA	110	int lwtunnel_valid_encap_type(u16 encap_type);
9ed59592 DA	111	int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len);
499a2425 RP	112	int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
499a2425 RP	113	struct nlattr *encap,
127eb7cd	114	unsigned int family, const void *cfg,
499a2425 RP	115	struct lwtunnel_state **lws);
	116	int lwtunnel_fill_encap(struct sk_buff *skb,
	117	struct lwtunnel_state *lwtstate);
	118	int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
	119	struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
	120	int lwtunnel_cmp_encap(struct lwtunnel_state a, struct lwtunnel_state b);
ede2059d	121	int lwtunnel_output(struct net net, struct sock sk, struct sk_buff *skb);
25368623	122	int lwtunnel_input(struct sk_buff *skb);
14972cbd	123	int lwtunnel_xmit(struct sk_buff *skb);
499a2425 RP	124
	125	#else
	126
824e7383 YX	127	static inline void lwtstate_free(struct lwtunnel_state *lws)
	128	{
	129	}
	130
5a6228a0 ND	131	static inline struct lwtunnel_state *
5a6228a0 ND	132	lwtstate_get(struct lwtunnel_state *lws)
499a2425	133	{
5a6228a0	134	return lws;
499a2425 RP	135	}
499a2425 RP	136
5a6228a0	137	static inline void lwtstate_put(struct lwtunnel_state *lws)
499a2425 RP	138	{
	139	}
	140
	141	static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
	142	{
	143	return false;
	144	}
	145
25368623 TH	146	static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
	147	{
	148	return false;
	149	}
	150
14972cbd RP	151	static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
	152	{
	153	return false;
	154	}
	155
	156	static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
	157	unsigned int mtu)
	158	{
	159	return 0;
	160	}
	161
499a2425 RP	162	static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
	163	unsigned int num)
	164	{
	165	return -EOPNOTSUPP;
	166
	167	}
	168
	169	static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
	170	unsigned int num)
	171	{
	172	return -EOPNOTSUPP;
	173	}
	174
9ed59592 DA	175	static inline int lwtunnel_valid_encap_type(u16 encap_type)
	176	{
	177	return -EOPNOTSUPP;
	178	}
	179	static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len)
	180	{
	181	return -EOPNOTSUPP;
	182	}
	183
499a2425 RP	184	static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
499a2425 RP	185	struct nlattr *encap,
127eb7cd	186	unsigned int family, const void *cfg,
499a2425 RP	187	struct lwtunnel_state **lws)
	188	{
	189	return -EOPNOTSUPP;
	190	}
	191
	192	static inline int lwtunnel_fill_encap(struct sk_buff *skb,
	193	struct lwtunnel_state *lwtstate)
	194	{
	195	return 0;
	196	}
	197
	198	static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
	199	{
	200	return 0;
	201	}
	202
	203	static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
	204	{
	205	return NULL;
	206	}
	207
	208	static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
	209	struct lwtunnel_state *b)
	210	{
	211	return 0;
	212	}
	213
ede2059d	214	static inline int lwtunnel_output(struct net net, struct sock sk, struct sk_buff *skb)
ffce4196 RP	215	{
	216	return -EOPNOTSUPP;
	217	}
	218
25368623 TH	219	static inline int lwtunnel_input(struct sk_buff *skb)
	220	{
	221	return -EOPNOTSUPP;
	222	}
	223
14972cbd RP	224	static inline int lwtunnel_xmit(struct sk_buff *skb)
	225	{
	226	return -EOPNOTSUPP;
	227	}
	228
745041e2 RS	229	#endif /* CONFIG_LWTUNNEL */
	230
	231	#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
499a2425 RP	232
499a2425 RP	233	#endif /* __NET_LWTUNNEL_H */