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 */