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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) | |
14972cbd RP |
16 | #define LWTUNNEL_STATE_XMIT_REDIRECT BIT(2) |
17 | ||
18 | enum { | |
19 | LWTUNNEL_XMIT_DONE, | |
20 | LWTUNNEL_XMIT_CONTINUE, | |
21 | }; | |
22 | ||
499a2425 RP |
23 | |
24 | struct lwtunnel_state { | |
25 | __u16 type; | |
26 | __u16 flags; | |
27 | atomic_t refcnt; | |
ede2059d | 28 | int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 29 | int (*orig_input)(struct sk_buff *); |
499a2425 | 30 | int len; |
14972cbd | 31 | __u16 headroom; |
499a2425 RP |
32 | __u8 data[0]; |
33 | }; | |
34 | ||
35 | struct lwtunnel_encap_ops { | |
36 | int (*build_state)(struct net_device *dev, struct nlattr *encap, | |
127eb7cd | 37 | unsigned int family, const void *cfg, |
499a2425 | 38 | struct lwtunnel_state **ts); |
ede2059d | 39 | int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 40 | int (*input)(struct sk_buff *skb); |
499a2425 RP |
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); | |
14972cbd | 45 | int (*xmit)(struct sk_buff *skb); |
499a2425 RP |
46 | }; |
47 | ||
499a2425 | 48 | #ifdef CONFIG_LWTUNNEL |
df383e62 JB |
49 | static inline void lwtstate_free(struct lwtunnel_state *lws) |
50 | { | |
51 | kfree(lws); | |
52 | } | |
53 | ||
5a6228a0 ND |
54 | static inline struct lwtunnel_state * |
55 | lwtstate_get(struct lwtunnel_state *lws) | |
499a2425 | 56 | { |
5a6228a0 ND |
57 | if (lws) |
58 | atomic_inc(&lws->refcnt); | |
59 | ||
60 | return lws; | |
499a2425 RP |
61 | } |
62 | ||
5a6228a0 | 63 | static inline void lwtstate_put(struct lwtunnel_state *lws) |
499a2425 RP |
64 | { |
65 | if (!lws) | |
66 | return; | |
67 | ||
68 | if (atomic_dec_and_test(&lws->refcnt)) | |
df383e62 | 69 | lwtstate_free(lws); |
499a2425 RP |
70 | } |
71 | ||
72 | static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) | |
73 | { | |
74 | if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT)) | |
75 | return true; | |
76 | ||
77 | return false; | |
78 | } | |
79 | ||
25368623 TH |
80 | static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) |
81 | { | |
82 | if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT)) | |
83 | return true; | |
84 | ||
85 | return false; | |
86 | } | |
14972cbd RP |
87 | |
88 | static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) | |
89 | { | |
90 | if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT)) | |
91 | return true; | |
92 | ||
93 | return false; | |
94 | } | |
95 | ||
96 | static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, | |
97 | unsigned int mtu) | |
98 | { | |
99 | if (lwtunnel_xmit_redirect(lwtstate) && lwtstate->headroom < mtu) | |
100 | return lwtstate->headroom; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
499a2425 RP |
105 | int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, |
106 | unsigned int num); | |
107 | int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
108 | unsigned int num); | |
109 | int lwtunnel_build_state(struct net_device *dev, u16 encap_type, | |
110 | struct nlattr *encap, | |
127eb7cd | 111 | unsigned int family, const void *cfg, |
499a2425 RP |
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); | |
ede2059d | 118 | int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 119 | int lwtunnel_input(struct sk_buff *skb); |
14972cbd | 120 | int lwtunnel_xmit(struct sk_buff *skb); |
499a2425 RP |
121 | |
122 | #else | |
123 | ||
824e7383 YX |
124 | static inline void lwtstate_free(struct lwtunnel_state *lws) |
125 | { | |
126 | } | |
127 | ||
5a6228a0 ND |
128 | static inline struct lwtunnel_state * |
129 | lwtstate_get(struct lwtunnel_state *lws) | |
499a2425 | 130 | { |
5a6228a0 | 131 | return lws; |
499a2425 RP |
132 | } |
133 | ||
5a6228a0 | 134 | static inline void lwtstate_put(struct lwtunnel_state *lws) |
499a2425 RP |
135 | { |
136 | } | |
137 | ||
138 | static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) | |
139 | { | |
140 | return false; | |
141 | } | |
142 | ||
25368623 TH |
143 | static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) |
144 | { | |
145 | return false; | |
146 | } | |
147 | ||
14972cbd RP |
148 | static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) |
149 | { | |
150 | return false; | |
151 | } | |
152 | ||
153 | static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, | |
154 | unsigned int mtu) | |
155 | { | |
156 | return 0; | |
157 | } | |
158 | ||
499a2425 RP |
159 | static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, |
160 | unsigned int num) | |
161 | { | |
162 | return -EOPNOTSUPP; | |
163 | ||
164 | } | |
165 | ||
166 | static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
167 | unsigned int num) | |
168 | { | |
169 | return -EOPNOTSUPP; | |
170 | } | |
171 | ||
172 | static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type, | |
173 | struct nlattr *encap, | |
127eb7cd | 174 | unsigned int family, const void *cfg, |
499a2425 RP |
175 | struct lwtunnel_state **lws) |
176 | { | |
177 | return -EOPNOTSUPP; | |
178 | } | |
179 | ||
180 | static inline int lwtunnel_fill_encap(struct sk_buff *skb, | |
181 | struct lwtunnel_state *lwtstate) | |
182 | { | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate) | |
187 | { | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len) | |
192 | { | |
193 | return NULL; | |
194 | } | |
195 | ||
196 | static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a, | |
197 | struct lwtunnel_state *b) | |
198 | { | |
199 | return 0; | |
200 | } | |
201 | ||
ede2059d | 202 | static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
ffce4196 RP |
203 | { |
204 | return -EOPNOTSUPP; | |
205 | } | |
206 | ||
25368623 TH |
207 | static inline int lwtunnel_input(struct sk_buff *skb) |
208 | { | |
209 | return -EOPNOTSUPP; | |
210 | } | |
211 | ||
14972cbd RP |
212 | static inline int lwtunnel_xmit(struct sk_buff *skb) |
213 | { | |
214 | return -EOPNOTSUPP; | |
215 | } | |
216 | ||
745041e2 RS |
217 | #endif /* CONFIG_LWTUNNEL */ |
218 | ||
219 | #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type)) | |
499a2425 RP |
220 | |
221 | #endif /* __NET_LWTUNNEL_H */ |