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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; | |
f76a9db3 | 27 | __u16 headroom; |
499a2425 | 28 | atomic_t refcnt; |
ede2059d | 29 | int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 30 | int (*orig_input)(struct sk_buff *); |
1104d9ba | 31 | struct rcu_head rcu; |
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); |
1104d9ba | 39 | void (*destroy_state)(struct lwtunnel_state *lws); |
ede2059d | 40 | int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 41 | int (*input)(struct sk_buff *skb); |
499a2425 RP |
42 | int (*fill_encap)(struct sk_buff *skb, |
43 | struct lwtunnel_state *lwtstate); | |
44 | int (*get_encap_size)(struct lwtunnel_state *lwtstate); | |
45 | int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b); | |
14972cbd | 46 | int (*xmit)(struct sk_buff *skb); |
499a2425 RP |
47 | }; |
48 | ||
499a2425 | 49 | #ifdef CONFIG_LWTUNNEL |
1104d9ba | 50 | void lwtstate_free(struct lwtunnel_state *lws); |
df383e62 | 51 | |
5a6228a0 ND |
52 | static inline struct lwtunnel_state * |
53 | lwtstate_get(struct lwtunnel_state *lws) | |
499a2425 | 54 | { |
5a6228a0 ND |
55 | if (lws) |
56 | atomic_inc(&lws->refcnt); | |
57 | ||
58 | return lws; | |
499a2425 RP |
59 | } |
60 | ||
5a6228a0 | 61 | static inline void lwtstate_put(struct lwtunnel_state *lws) |
499a2425 RP |
62 | { |
63 | if (!lws) | |
64 | return; | |
65 | ||
66 | if (atomic_dec_and_test(&lws->refcnt)) | |
df383e62 | 67 | lwtstate_free(lws); |
499a2425 RP |
68 | } |
69 | ||
70 | static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) | |
71 | { | |
72 | if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT)) | |
73 | return true; | |
74 | ||
75 | return false; | |
76 | } | |
77 | ||
25368623 TH |
78 | static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) |
79 | { | |
80 | if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT)) | |
81 | return true; | |
82 | ||
83 | return false; | |
84 | } | |
14972cbd RP |
85 | |
86 | static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) | |
87 | { | |
88 | if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT)) | |
89 | return true; | |
90 | ||
91 | return false; | |
92 | } | |
93 | ||
94 | static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, | |
95 | unsigned int mtu) | |
96 | { | |
a23a8f5b DL |
97 | if ((lwtunnel_xmit_redirect(lwtstate) || |
98 | lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu) | |
14972cbd RP |
99 | return lwtstate->headroom; |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
499a2425 RP |
104 | int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, |
105 | unsigned int num); | |
106 | int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
107 | unsigned int num); | |
108 | int lwtunnel_build_state(struct net_device *dev, u16 encap_type, | |
109 | struct nlattr *encap, | |
127eb7cd | 110 | unsigned int family, const void *cfg, |
499a2425 RP |
111 | struct lwtunnel_state **lws); |
112 | int lwtunnel_fill_encap(struct sk_buff *skb, | |
113 | struct lwtunnel_state *lwtstate); | |
114 | int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate); | |
115 | struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len); | |
116 | int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b); | |
ede2059d | 117 | int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 118 | int lwtunnel_input(struct sk_buff *skb); |
14972cbd | 119 | int lwtunnel_xmit(struct sk_buff *skb); |
499a2425 RP |
120 | |
121 | #else | |
122 | ||
824e7383 YX |
123 | static inline void lwtstate_free(struct lwtunnel_state *lws) |
124 | { | |
125 | } | |
126 | ||
5a6228a0 ND |
127 | static inline struct lwtunnel_state * |
128 | lwtstate_get(struct lwtunnel_state *lws) | |
499a2425 | 129 | { |
5a6228a0 | 130 | return lws; |
499a2425 RP |
131 | } |
132 | ||
5a6228a0 | 133 | static inline void lwtstate_put(struct lwtunnel_state *lws) |
499a2425 RP |
134 | { |
135 | } | |
136 | ||
137 | static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) | |
138 | { | |
139 | return false; | |
140 | } | |
141 | ||
25368623 TH |
142 | static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) |
143 | { | |
144 | return false; | |
145 | } | |
146 | ||
14972cbd RP |
147 | static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) |
148 | { | |
149 | return false; | |
150 | } | |
151 | ||
152 | static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, | |
153 | unsigned int mtu) | |
154 | { | |
155 | return 0; | |
156 | } | |
157 | ||
499a2425 RP |
158 | static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, |
159 | unsigned int num) | |
160 | { | |
161 | return -EOPNOTSUPP; | |
162 | ||
163 | } | |
164 | ||
165 | static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
166 | unsigned int num) | |
167 | { | |
168 | return -EOPNOTSUPP; | |
169 | } | |
170 | ||
171 | static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type, | |
172 | struct nlattr *encap, | |
127eb7cd | 173 | unsigned int family, const void *cfg, |
499a2425 RP |
174 | struct lwtunnel_state **lws) |
175 | { | |
176 | return -EOPNOTSUPP; | |
177 | } | |
178 | ||
179 | static inline int lwtunnel_fill_encap(struct sk_buff *skb, | |
180 | struct lwtunnel_state *lwtstate) | |
181 | { | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate) | |
186 | { | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len) | |
191 | { | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a, | |
196 | struct lwtunnel_state *b) | |
197 | { | |
198 | return 0; | |
199 | } | |
200 | ||
ede2059d | 201 | static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
ffce4196 RP |
202 | { |
203 | return -EOPNOTSUPP; | |
204 | } | |
205 | ||
25368623 TH |
206 | static inline int lwtunnel_input(struct sk_buff *skb) |
207 | { | |
208 | return -EOPNOTSUPP; | |
209 | } | |
210 | ||
14972cbd RP |
211 | static inline int lwtunnel_xmit(struct sk_buff *skb) |
212 | { | |
213 | return -EOPNOTSUPP; | |
214 | } | |
215 | ||
745041e2 RS |
216 | #endif /* CONFIG_LWTUNNEL */ |
217 | ||
218 | #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type)) | |
499a2425 RP |
219 | |
220 | #endif /* __NET_LWTUNNEL_H */ |