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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); |
88ff7334 RS |
47 | |
48 | struct module *owner; | |
499a2425 RP |
49 | }; |
50 | ||
499a2425 | 51 | #ifdef CONFIG_LWTUNNEL |
1104d9ba | 52 | void lwtstate_free(struct lwtunnel_state *lws); |
df383e62 | 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 | { | |
a23a8f5b DL |
99 | if ((lwtunnel_xmit_redirect(lwtstate) || |
100 | lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu) | |
14972cbd RP |
101 | return lwtstate->headroom; |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
499a2425 RP |
106 | int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, |
107 | unsigned int num); | |
108 | int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
109 | unsigned int num); | |
9ed59592 DA |
110 | int lwtunnel_valid_encap_type(u16 encap_type); |
111 | int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len); | |
499a2425 RP |
112 | int lwtunnel_build_state(struct net_device *dev, u16 encap_type, |
113 | struct nlattr *encap, | |
127eb7cd | 114 | unsigned int family, const void *cfg, |
499a2425 RP |
115 | struct lwtunnel_state **lws); |
116 | int lwtunnel_fill_encap(struct sk_buff *skb, | |
117 | struct lwtunnel_state *lwtstate); | |
118 | int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate); | |
119 | struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len); | |
120 | int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b); | |
ede2059d | 121 | int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
25368623 | 122 | int lwtunnel_input(struct sk_buff *skb); |
14972cbd | 123 | int lwtunnel_xmit(struct sk_buff *skb); |
499a2425 RP |
124 | |
125 | #else | |
126 | ||
824e7383 YX |
127 | static inline void lwtstate_free(struct lwtunnel_state *lws) |
128 | { | |
129 | } | |
130 | ||
5a6228a0 ND |
131 | static inline struct lwtunnel_state * |
132 | lwtstate_get(struct lwtunnel_state *lws) | |
499a2425 | 133 | { |
5a6228a0 | 134 | return lws; |
499a2425 RP |
135 | } |
136 | ||
5a6228a0 | 137 | static inline void lwtstate_put(struct lwtunnel_state *lws) |
499a2425 RP |
138 | { |
139 | } | |
140 | ||
141 | static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) | |
142 | { | |
143 | return false; | |
144 | } | |
145 | ||
25368623 TH |
146 | static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) |
147 | { | |
148 | return false; | |
149 | } | |
150 | ||
14972cbd RP |
151 | static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) |
152 | { | |
153 | return false; | |
154 | } | |
155 | ||
156 | static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, | |
157 | unsigned int mtu) | |
158 | { | |
159 | return 0; | |
160 | } | |
161 | ||
499a2425 RP |
162 | static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, |
163 | unsigned int num) | |
164 | { | |
165 | return -EOPNOTSUPP; | |
166 | ||
167 | } | |
168 | ||
169 | static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, | |
170 | unsigned int num) | |
171 | { | |
172 | return -EOPNOTSUPP; | |
173 | } | |
174 | ||
9ed59592 DA |
175 | static inline int lwtunnel_valid_encap_type(u16 encap_type) |
176 | { | |
177 | return -EOPNOTSUPP; | |
178 | } | |
179 | static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len) | |
180 | { | |
181 | return -EOPNOTSUPP; | |
182 | } | |
183 | ||
499a2425 RP |
184 | static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type, |
185 | struct nlattr *encap, | |
127eb7cd | 186 | unsigned int family, const void *cfg, |
499a2425 RP |
187 | struct lwtunnel_state **lws) |
188 | { | |
189 | return -EOPNOTSUPP; | |
190 | } | |
191 | ||
192 | static inline int lwtunnel_fill_encap(struct sk_buff *skb, | |
193 | struct lwtunnel_state *lwtstate) | |
194 | { | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate) | |
199 | { | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len) | |
204 | { | |
205 | return NULL; | |
206 | } | |
207 | ||
208 | static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a, | |
209 | struct lwtunnel_state *b) | |
210 | { | |
211 | return 0; | |
212 | } | |
213 | ||
ede2059d | 214 | static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
ffce4196 RP |
215 | { |
216 | return -EOPNOTSUPP; | |
217 | } | |
218 | ||
25368623 TH |
219 | static inline int lwtunnel_input(struct sk_buff *skb) |
220 | { | |
221 | return -EOPNOTSUPP; | |
222 | } | |
223 | ||
14972cbd RP |
224 | static inline int lwtunnel_xmit(struct sk_buff *skb) |
225 | { | |
226 | return -EOPNOTSUPP; | |
227 | } | |
228 | ||
745041e2 RS |
229 | #endif /* CONFIG_LWTUNNEL */ |
230 | ||
231 | #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type)) | |
499a2425 RP |
232 | |
233 | #endif /* __NET_LWTUNNEL_H */ |