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499a2425 RP |
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 | ||
16 | struct lwtunnel_state { | |
17 | __u16 type; | |
18 | __u16 flags; | |
19 | atomic_t refcnt; | |
20 | int len; | |
21 | __u8 data[0]; | |
22 | }; | |
23 | ||
24 | struct 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 | ||
34 | extern const struct lwtunnel_encap_ops __rcu * | |
35 | lwtun_encaps[LWTUNNEL_ENCAP_MAX+1]; | |
36 | ||
37 | #ifdef CONFIG_LWTUNNEL | |
38 | static inline void lwtunnel_state_get(struct lwtunnel_state *lws) | |
39 | { | |
40 | atomic_inc(&lws->refcnt); | |
41 | } | |
42 | ||
43 | static 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 | ||
52 | static 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 | ||
60 | int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, | |
61 | unsigned int num); | |
62 | int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
63 | unsigned int num); | |
64 | int lwtunnel_build_state(struct net_device *dev, u16 encap_type, | |
65 | struct nlattr *encap, | |
66 | struct lwtunnel_state **lws); | |
67 | int lwtunnel_fill_encap(struct sk_buff *skb, | |
68 | struct lwtunnel_state *lwtstate); | |
69 | int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate); | |
70 | struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len); | |
71 | int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b); | |
72 | ||
73 | #else | |
74 | ||
75 | static inline void lwtunnel_state_get(struct lwtunnel_state *lws) | |
76 | { | |
77 | } | |
78 | ||
79 | static inline void lwtunnel_state_put(struct lwtunnel_state *lws) | |
80 | { | |
81 | } | |
82 | ||
83 | static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) | |
84 | { | |
85 | return false; | |
86 | } | |
87 | ||
88 | static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, | |
89 | unsigned int num) | |
90 | { | |
91 | return -EOPNOTSUPP; | |
92 | ||
93 | } | |
94 | ||
95 | static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
96 | unsigned int num) | |
97 | { | |
98 | return -EOPNOTSUPP; | |
99 | } | |
100 | ||
101 | static 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 | ||
108 | static inline int lwtunnel_fill_encap(struct sk_buff *skb, | |
109 | struct lwtunnel_state *lwtstate) | |
110 | { | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate) | |
115 | { | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len) | |
120 | { | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | static 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 */ |