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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 */ | |
25368623 TH |
14 | #define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0) |
15 | #define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1) | |
499a2425 RP |
16 | |
17 | struct lwtunnel_state { | |
18 | __u16 type; | |
19 | __u16 flags; | |
20 | atomic_t refcnt; | |
ede2059d | 21 | int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 22 | int (*orig_input)(struct sk_buff *); |
499a2425 RP |
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, | |
127eb7cd | 29 | unsigned int family, const void *cfg, |
499a2425 | 30 | struct lwtunnel_state **ts); |
ede2059d | 31 | int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 32 | int (*input)(struct sk_buff *skb); |
499a2425 RP |
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 | ||
499a2425 | 39 | #ifdef CONFIG_LWTUNNEL |
df383e62 JB |
40 | static inline void lwtstate_free(struct lwtunnel_state *lws) |
41 | { | |
42 | kfree(lws); | |
43 | } | |
44 | ||
5a6228a0 ND |
45 | static inline struct lwtunnel_state * |
46 | lwtstate_get(struct lwtunnel_state *lws) | |
499a2425 | 47 | { |
5a6228a0 ND |
48 | if (lws) |
49 | atomic_inc(&lws->refcnt); | |
50 | ||
51 | return lws; | |
499a2425 RP |
52 | } |
53 | ||
5a6228a0 | 54 | static inline void lwtstate_put(struct lwtunnel_state *lws) |
499a2425 RP |
55 | { |
56 | if (!lws) | |
57 | return; | |
58 | ||
59 | if (atomic_dec_and_test(&lws->refcnt)) | |
df383e62 | 60 | lwtstate_free(lws); |
499a2425 RP |
61 | } |
62 | ||
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 | ||
25368623 TH |
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 | } | |
499a2425 RP |
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, | |
127eb7cd | 84 | unsigned int family, const void *cfg, |
499a2425 RP |
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); | |
ede2059d | 91 | int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 92 | int lwtunnel_input(struct sk_buff *skb); |
499a2425 RP |
93 | |
94 | #else | |
95 | ||
824e7383 YX |
96 | static inline void lwtstate_free(struct lwtunnel_state *lws) |
97 | { | |
98 | } | |
99 | ||
5a6228a0 ND |
100 | static inline struct lwtunnel_state * |
101 | lwtstate_get(struct lwtunnel_state *lws) | |
499a2425 | 102 | { |
5a6228a0 | 103 | return lws; |
499a2425 RP |
104 | } |
105 | ||
5a6228a0 | 106 | static inline void lwtstate_put(struct lwtunnel_state *lws) |
499a2425 RP |
107 | { |
108 | } | |
109 | ||
110 | static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) | |
111 | { | |
112 | return false; | |
113 | } | |
114 | ||
25368623 TH |
115 | static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) |
116 | { | |
117 | return false; | |
118 | } | |
119 | ||
499a2425 RP |
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 | ||
127 | static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
128 | unsigned int num) | |
129 | { | |
130 | return -EOPNOTSUPP; | |
131 | } | |
132 | ||
133 | static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type, | |
134 | struct nlattr *encap, | |
127eb7cd | 135 | unsigned int family, const void *cfg, |
499a2425 RP |
136 | struct lwtunnel_state **lws) |
137 | { | |
138 | return -EOPNOTSUPP; | |
139 | } | |
140 | ||
141 | static inline int lwtunnel_fill_encap(struct sk_buff *skb, | |
142 | struct lwtunnel_state *lwtstate) | |
143 | { | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate) | |
148 | { | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len) | |
153 | { | |
154 | return NULL; | |
155 | } | |
156 | ||
157 | static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a, | |
158 | struct lwtunnel_state *b) | |
159 | { | |
160 | return 0; | |
161 | } | |
162 | ||
ede2059d | 163 | static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
ffce4196 RP |
164 | { |
165 | return -EOPNOTSUPP; | |
166 | } | |
167 | ||
25368623 TH |
168 | static inline int lwtunnel_input(struct sk_buff *skb) |
169 | { | |
170 | return -EOPNOTSUPP; | |
171 | } | |
172 | ||
745041e2 RS |
173 | #endif /* CONFIG_LWTUNNEL */ |
174 | ||
175 | #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type)) | |
499a2425 RP |
176 | |
177 | #endif /* __NET_LWTUNNEL_H */ |