1 #ifndef __NET_LWTUNNEL_H
2 #define __NET_LWTUNNEL_H 1
4 #include <linux/lwtunnel.h>
5 #include <linux/netdevice.h>
6 #include <linux/skbuff.h>
7 #include <linux/types.h>
10 #define LWTUNNEL_HASH_BITS 7
11 #define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS)
13 /* lw tunnel state flags */
14 #define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0)
15 #define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1)
16 #define LWTUNNEL_STATE_XMIT_REDIRECT BIT(2)
20 LWTUNNEL_XMIT_CONTINUE
,
24 struct lwtunnel_state
{
28 int (*orig_output
)(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
29 int (*orig_input
)(struct sk_buff
*);
35 struct lwtunnel_encap_ops
{
36 int (*build_state
)(struct net_device
*dev
, struct nlattr
*encap
,
37 unsigned int family
, const void *cfg
,
38 struct lwtunnel_state
**ts
);
39 int (*output
)(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
40 int (*input
)(struct sk_buff
*skb
);
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
);
45 int (*xmit
)(struct sk_buff
*skb
);
48 #ifdef CONFIG_LWTUNNEL
49 static inline void lwtstate_free(struct lwtunnel_state
*lws
)
54 static inline struct lwtunnel_state
*
55 lwtstate_get(struct lwtunnel_state
*lws
)
58 atomic_inc(&lws
->refcnt
);
63 static inline void lwtstate_put(struct lwtunnel_state
*lws
)
68 if (atomic_dec_and_test(&lws
->refcnt
))
72 static inline bool lwtunnel_output_redirect(struct lwtunnel_state
*lwtstate
)
74 if (lwtstate
&& (lwtstate
->flags
& LWTUNNEL_STATE_OUTPUT_REDIRECT
))
80 static inline bool lwtunnel_input_redirect(struct lwtunnel_state
*lwtstate
)
82 if (lwtstate
&& (lwtstate
->flags
& LWTUNNEL_STATE_INPUT_REDIRECT
))
88 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state
*lwtstate
)
90 if (lwtstate
&& (lwtstate
->flags
& LWTUNNEL_STATE_XMIT_REDIRECT
))
96 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state
*lwtstate
,
99 if (lwtunnel_xmit_redirect(lwtstate
) && lwtstate
->headroom
< mtu
)
100 return lwtstate
->headroom
;
105 int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops
*op
,
107 int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops
*op
,
109 int lwtunnel_build_state(struct net_device
*dev
, u16 encap_type
,
110 struct nlattr
*encap
,
111 unsigned int family
, const void *cfg
,
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
);
118 int lwtunnel_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
);
119 int lwtunnel_input(struct sk_buff
*skb
);
120 int lwtunnel_xmit(struct sk_buff
*skb
);
124 static inline void lwtstate_free(struct lwtunnel_state
*lws
)
128 static inline struct lwtunnel_state
*
129 lwtstate_get(struct lwtunnel_state
*lws
)
134 static inline void lwtstate_put(struct lwtunnel_state
*lws
)
138 static inline bool lwtunnel_output_redirect(struct lwtunnel_state
*lwtstate
)
143 static inline bool lwtunnel_input_redirect(struct lwtunnel_state
*lwtstate
)
148 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state
*lwtstate
)
153 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state
*lwtstate
,
159 static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops
*op
,
166 static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops
*op
,
172 static inline int lwtunnel_build_state(struct net_device
*dev
, u16 encap_type
,
173 struct nlattr
*encap
,
174 unsigned int family
, const void *cfg
,
175 struct lwtunnel_state
**lws
)
180 static inline int lwtunnel_fill_encap(struct sk_buff
*skb
,
181 struct lwtunnel_state
*lwtstate
)
186 static inline int lwtunnel_get_encap_size(struct lwtunnel_state
*lwtstate
)
191 static inline struct lwtunnel_state
*lwtunnel_state_alloc(int hdr_len
)
196 static inline int lwtunnel_cmp_encap(struct lwtunnel_state
*a
,
197 struct lwtunnel_state
*b
)
202 static inline int lwtunnel_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
207 static inline int lwtunnel_input(struct sk_buff
*skb
)
212 static inline int lwtunnel_xmit(struct sk_buff
*skb
)
217 #endif /* CONFIG_LWTUNNEL */
219 #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
221 #endif /* __NET_LWTUNNEL_H */