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 {
29 int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
30 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 void (*destroy_state)(struct lwtunnel_state *lws);
40 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
41 int (*input)(struct sk_buff *skb);
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);
46 int (*xmit)(struct sk_buff *skb);
49 #ifdef CONFIG_LWTUNNEL
50 void lwtstate_free(struct lwtunnel_state *lws);
52 static inline struct lwtunnel_state *
53 lwtstate_get(struct lwtunnel_state *lws)
56 atomic_inc(&lws->refcnt);
61 static inline void lwtstate_put(struct lwtunnel_state *lws)
66 if (atomic_dec_and_test(&lws->refcnt))
70 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
72 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
78 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
80 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
86 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
88 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
94 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
97 if ((lwtunnel_xmit_redirect(lwtstate) ||
98 lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu)
99 return lwtstate->headroom;
104 int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
106 int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
108 int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
109 struct nlattr *encap,
110 unsigned int family, const void *cfg,
111 struct lwtunnel_state **lws);
112 int lwtunnel_fill_encap(struct sk_buff *skb,
113 struct lwtunnel_state *lwtstate);
114 int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
115 struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
116 int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
117 int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
118 int lwtunnel_input(struct sk_buff *skb);
119 int lwtunnel_xmit(struct sk_buff *skb);
123 static inline void lwtstate_free(struct lwtunnel_state *lws)
127 static inline struct lwtunnel_state *
128 lwtstate_get(struct lwtunnel_state *lws)
133 static inline void lwtstate_put(struct lwtunnel_state *lws)
137 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
142 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
147 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
152 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
158 static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
165 static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
171 static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
172 struct nlattr *encap,
173 unsigned int family, const void *cfg,
174 struct lwtunnel_state **lws)
179 static inline int lwtunnel_fill_encap(struct sk_buff *skb,
180 struct lwtunnel_state *lwtstate)
185 static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
190 static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
195 static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
196 struct lwtunnel_state *b)
201 static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
206 static inline int lwtunnel_input(struct sk_buff *skb)
211 static inline int lwtunnel_xmit(struct sk_buff *skb)
216 #endif /* CONFIG_LWTUNNEL */
218 #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
220 #endif /* __NET_LWTUNNEL_H */