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 */
14 #define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0)
15 #define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1)
16
17 struct lwtunnel_state {
18 __u16 type;
19 __u16 flags;
20 atomic_t refcnt;
21 int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
22 int (*orig_input)(struct sk_buff *);
23 int len;
24 __u8 data[0];
25 };
26
27 struct lwtunnel_encap_ops {
28 int (*build_state)(struct net_device *dev, struct nlattr *encap,
29 unsigned int family, const void *cfg,
30 struct lwtunnel_state **ts);
31 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
32 int (*input)(struct sk_buff *skb);
33 int (*fill_encap)(struct sk_buff *skb,
34 struct lwtunnel_state *lwtstate);
35 int (*get_encap_size)(struct lwtunnel_state *lwtstate);
36 int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
37 };
38
39 #ifdef CONFIG_LWTUNNEL
lwtstate_free(struct lwtunnel_state * lws)40 static inline void lwtstate_free(struct lwtunnel_state *lws)
41 {
42 kfree(lws);
43 }
44
45 static inline struct lwtunnel_state *
lwtstate_get(struct lwtunnel_state * lws)46 lwtstate_get(struct lwtunnel_state *lws)
47 {
48 if (lws)
49 atomic_inc(&lws->refcnt);
50
51 return lws;
52 }
53
lwtstate_put(struct lwtunnel_state * lws)54 static inline void lwtstate_put(struct lwtunnel_state *lws)
55 {
56 if (!lws)
57 return;
58
59 if (atomic_dec_and_test(&lws->refcnt))
60 lwtstate_free(lws);
61 }
62
lwtunnel_output_redirect(struct lwtunnel_state * lwtstate)63 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
64 {
65 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
66 return true;
67
68 return false;
69 }
70
lwtunnel_input_redirect(struct lwtunnel_state * lwtstate)71 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
72 {
73 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
74 return true;
75
76 return false;
77 }
78 int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
79 unsigned int num);
80 int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
81 unsigned int num);
82 int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
83 struct nlattr *encap,
84 unsigned int family, const void *cfg,
85 struct lwtunnel_state **lws);
86 int lwtunnel_fill_encap(struct sk_buff *skb,
87 struct lwtunnel_state *lwtstate);
88 int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
89 struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
90 int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
91 int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
92 int lwtunnel_input(struct sk_buff *skb);
93
94 #else
95
lwtstate_free(struct lwtunnel_state * lws)96 static inline void lwtstate_free(struct lwtunnel_state *lws)
97 {
98 }
99
100 static inline struct lwtunnel_state *
lwtstate_get(struct lwtunnel_state * lws)101 lwtstate_get(struct lwtunnel_state *lws)
102 {
103 return lws;
104 }
105
lwtstate_put(struct lwtunnel_state * lws)106 static inline void lwtstate_put(struct lwtunnel_state *lws)
107 {
108 }
109
lwtunnel_output_redirect(struct lwtunnel_state * lwtstate)110 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
111 {
112 return false;
113 }
114
lwtunnel_input_redirect(struct lwtunnel_state * lwtstate)115 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
116 {
117 return false;
118 }
119
lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops * op,unsigned int num)120 static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
121 unsigned int num)
122 {
123 return -EOPNOTSUPP;
124
125 }
126
lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops * op,unsigned int num)127 static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
128 unsigned int num)
129 {
130 return -EOPNOTSUPP;
131 }
132
lwtunnel_build_state(struct net_device * dev,u16 encap_type,struct nlattr * encap,unsigned int family,const void * cfg,struct lwtunnel_state ** lws)133 static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
134 struct nlattr *encap,
135 unsigned int family, const void *cfg,
136 struct lwtunnel_state **lws)
137 {
138 return -EOPNOTSUPP;
139 }
140
lwtunnel_fill_encap(struct sk_buff * skb,struct lwtunnel_state * lwtstate)141 static inline int lwtunnel_fill_encap(struct sk_buff *skb,
142 struct lwtunnel_state *lwtstate)
143 {
144 return 0;
145 }
146
lwtunnel_get_encap_size(struct lwtunnel_state * lwtstate)147 static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
148 {
149 return 0;
150 }
151
lwtunnel_state_alloc(int hdr_len)152 static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
153 {
154 return NULL;
155 }
156
lwtunnel_cmp_encap(struct lwtunnel_state * a,struct lwtunnel_state * b)157 static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
158 struct lwtunnel_state *b)
159 {
160 return 0;
161 }
162
lwtunnel_output(struct net * net,struct sock * sk,struct sk_buff * skb)163 static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
164 {
165 return -EOPNOTSUPP;
166 }
167
lwtunnel_input(struct sk_buff * skb)168 static inline int lwtunnel_input(struct sk_buff *skb)
169 {
170 return -EOPNOTSUPP;
171 }
172
173 #endif
174
175 #endif /* __NET_LWTUNNEL_H */
176