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gerrit-public.fairphone.software / kernel / msm-4.9 / 499a24256862714539e902c0499b67da2bb3ab72 / . / include / net / lwtunnel.h
blob: df24b3611ff49b17759dad1b0d2c1698f583a13c [file] [log] [blame]
Roopa Prabhu499a2422015-07-21 10:43:46 +0200[diff] [blame^]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 0x1
15
16struct lwtunnel_state {
17 __u16 type;
18 __u16 flags;
19 atomic_t refcnt;
20 int len;
21 __u8 data[0];
22};
23
24struct lwtunnel_encap_ops {
25 int (*build_state)(struct net_device *dev, struct nlattr *encap,
26 struct lwtunnel_state **ts);
27 int (*output)(struct sock *sk, struct sk_buff *skb);
28 int (*fill_encap)(struct sk_buff *skb,
29 struct lwtunnel_state *lwtstate);
30 int (*get_encap_size)(struct lwtunnel_state *lwtstate);
31 int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
32};
33
34extern const struct lwtunnel_encap_ops __rcu *
35 lwtun_encaps[LWTUNNEL_ENCAP_MAX+1];
36
37#ifdef CONFIG_LWTUNNEL
38static inline void lwtunnel_state_get(struct lwtunnel_state *lws)
39{
40 atomic_inc(&lws->refcnt);
41}
42
43static inline void lwtunnel_state_put(struct lwtunnel_state *lws)
44{
45 if (!lws)
46 return;
47
48 if (atomic_dec_and_test(&lws->refcnt))
49 kfree(lws);
50}
51
52static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
53{
54 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
55 return true;
56
57 return false;
58}
59
60int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
61 unsigned int num);
62int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
63 unsigned int num);
64int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
65 struct nlattr *encap,
66 struct lwtunnel_state **lws);
67int lwtunnel_fill_encap(struct sk_buff *skb,
68 struct lwtunnel_state *lwtstate);
69int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
70struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
71int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
72
73#else
74
75static inline void lwtunnel_state_get(struct lwtunnel_state *lws)
76{
77}
78
79static inline void lwtunnel_state_put(struct lwtunnel_state *lws)
80{
81}
82
83static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
84{
85 return false;
86}
87
88static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
89 unsigned int num)
90{
91 return -EOPNOTSUPP;
92
93}
94
95static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
96 unsigned int num)
97{
98 return -EOPNOTSUPP;
99}
100
101static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
102 struct nlattr *encap,
103 struct lwtunnel_state **lws)
104{
105 return -EOPNOTSUPP;
106}
107
108static inline int lwtunnel_fill_encap(struct sk_buff *skb,
109 struct lwtunnel_state *lwtstate)
110{
111 return 0;
112}
113
114static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
115{
116 return 0;
117}
118
119static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
120{
121 return NULL;
122}
123
124static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
125 struct lwtunnel_state *b)
126{
127 return 0;
128}
129
130#endif
131
132#endif /* __NET_LWTUNNEL_H */