target/cxgbit: Use T6 specific macros to get ETH/IP hdr len
[linux/fpc-iii.git] / include / net / lwtunnel.h
blob73dd8764746069d48cd9ed6863f54c53864bb47a
1 #ifndef __NET_LWTUNNEL_H
2 #define __NET_LWTUNNEL_H 1
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>
10 #define LWTUNNEL_HASH_BITS 7
11 #define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS)
13 /* lw tunnel state flags */
14 #define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0)
15 #define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1)
16 #define LWTUNNEL_STATE_XMIT_REDIRECT BIT(2)
18 enum {
19 LWTUNNEL_XMIT_DONE,
20 LWTUNNEL_XMIT_CONTINUE,
24 struct lwtunnel_state {
25 __u16 type;
26 __u16 flags;
27 __u16 headroom;
28 atomic_t refcnt;
29 int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
30 int (*orig_input)(struct sk_buff *);
31 struct rcu_head rcu;
32 __u8 data[0];
35 struct lwtunnel_encap_ops {
36 int (*build_state)(struct net_device *dev, struct nlattr *encap,
37 unsigned int family, const void *cfg,
38 struct lwtunnel_state **ts);
39 void (*destroy_state)(struct lwtunnel_state *lws);
40 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
41 int (*input)(struct sk_buff *skb);
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);
46 int (*xmit)(struct sk_buff *skb);
48 struct module *owner;
51 #ifdef CONFIG_LWTUNNEL
52 void lwtstate_free(struct lwtunnel_state *lws);
54 static inline struct lwtunnel_state *
55 lwtstate_get(struct lwtunnel_state *lws)
57 if (lws)
58 atomic_inc(&lws->refcnt);
60 return lws;
63 static inline void lwtstate_put(struct lwtunnel_state *lws)
65 if (!lws)
66 return;
68 if (atomic_dec_and_test(&lws->refcnt))
69 lwtstate_free(lws);
72 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
74 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
75 return true;
77 return false;
80 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
82 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
83 return true;
85 return false;
88 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
90 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
91 return true;
93 return false;
96 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
97 unsigned int mtu)
99 if ((lwtunnel_xmit_redirect(lwtstate) ||
100 lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu)
101 return lwtstate->headroom;
103 return 0;
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);
110 int lwtunnel_valid_encap_type(u16 encap_type);
111 int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len);
112 int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
113 struct nlattr *encap,
114 unsigned int family, const void *cfg,
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);
121 int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
122 int lwtunnel_input(struct sk_buff *skb);
123 int lwtunnel_xmit(struct sk_buff *skb);
125 #else
127 static inline void lwtstate_free(struct lwtunnel_state *lws)
131 static inline struct lwtunnel_state *
132 lwtstate_get(struct lwtunnel_state *lws)
134 return lws;
137 static inline void lwtstate_put(struct lwtunnel_state *lws)
141 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
143 return false;
146 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
148 return false;
151 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
153 return false;
156 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
157 unsigned int mtu)
159 return 0;
162 static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
163 unsigned int num)
165 return -EOPNOTSUPP;
169 static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
170 unsigned int num)
172 return -EOPNOTSUPP;
175 static inline int lwtunnel_valid_encap_type(u16 encap_type)
177 return -EOPNOTSUPP;
179 static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len)
181 return -EOPNOTSUPP;
184 static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
185 struct nlattr *encap,
186 unsigned int family, const void *cfg,
187 struct lwtunnel_state **lws)
189 return -EOPNOTSUPP;
192 static inline int lwtunnel_fill_encap(struct sk_buff *skb,
193 struct lwtunnel_state *lwtstate)
195 return 0;
198 static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
200 return 0;
203 static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
205 return NULL;
208 static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
209 struct lwtunnel_state *b)
211 return 0;
214 static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
216 return -EOPNOTSUPP;
219 static inline int lwtunnel_input(struct sk_buff *skb)
221 return -EOPNOTSUPP;
224 static inline int lwtunnel_xmit(struct sk_buff *skb)
226 return -EOPNOTSUPP;
229 #endif /* CONFIG_LWTUNNEL */
231 #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
233 #endif /* __NET_LWTUNNEL_H */