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>
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)
20 LWTUNNEL_XMIT_CONTINUE,
24 struct lwtunnel_state {
29 int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
30 int (*orig_input)(struct sk_buff *);
35 struct lwtunnel_encap_ops {
36 int (*build_state)(struct nlattr *encap,
37 unsigned int family, const void *cfg,
38 struct lwtunnel_state **ts,
39 struct netlink_ext_ack *extack);
40 void (*destroy_state)(struct lwtunnel_state *lws);
41 int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
42 int (*input)(struct sk_buff *skb);
43 int (*fill_encap)(struct sk_buff *skb,
44 struct lwtunnel_state *lwtstate);
45 int (*get_encap_size)(struct lwtunnel_state *lwtstate);
46 int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
47 int (*xmit)(struct sk_buff *skb);
52 #ifdef CONFIG_LWTUNNEL
53 void lwtstate_free(struct lwtunnel_state *lws);
55 static inline struct lwtunnel_state *
56 lwtstate_get(struct lwtunnel_state *lws)
59 atomic_inc(&lws->refcnt);
64 static inline void lwtstate_put(struct lwtunnel_state *lws)
69 if (atomic_dec_and_test(&lws->refcnt))
73 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
75 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
81 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
83 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
89 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
91 if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT))
97 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
100 if ((lwtunnel_xmit_redirect(lwtstate) ||
101 lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu)
102 return lwtstate->headroom;
107 int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
109 int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
111 int lwtunnel_valid_encap_type(u16 encap_type,
112 struct netlink_ext_ack *extack);
113 int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
114 struct netlink_ext_ack *extack);
115 int lwtunnel_build_state(u16 encap_type,
116 struct nlattr *encap,
117 unsigned int family, const void *cfg,
118 struct lwtunnel_state **lws,
119 struct netlink_ext_ack *extack);
120 int lwtunnel_fill_encap(struct sk_buff *skb,
121 struct lwtunnel_state *lwtstate);
122 int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
123 struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
124 int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
125 int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
126 int lwtunnel_input(struct sk_buff *skb);
127 int lwtunnel_xmit(struct sk_buff *skb);
131 static inline void lwtstate_free(struct lwtunnel_state *lws)
135 static inline struct lwtunnel_state *
136 lwtstate_get(struct lwtunnel_state *lws)
141 static inline void lwtstate_put(struct lwtunnel_state *lws)
145 static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
150 static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
155 static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
160 static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
166 static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
173 static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
179 static inline int lwtunnel_valid_encap_type(u16 encap_type,
180 struct netlink_ext_ack *extack)
182 NL_SET_ERR_MSG(extack, "CONFIG_LWTUNNEL is not enabled in this kernel");
185 static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
186 struct netlink_ext_ack *extack)
188 /* return 0 since we are not walking attr looking for
189 * RTA_ENCAP_TYPE attribute on nexthops.
194 static inline int lwtunnel_build_state(u16 encap_type,
195 struct nlattr *encap,
196 unsigned int family, const void *cfg,
197 struct lwtunnel_state **lws,
198 struct netlink_ext_ack *extack)
203 static inline int lwtunnel_fill_encap(struct sk_buff *skb,
204 struct lwtunnel_state *lwtstate)
209 static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
214 static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
219 static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
220 struct lwtunnel_state *b)
225 static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
230 static inline int lwtunnel_input(struct sk_buff *skb)
235 static inline int lwtunnel_xmit(struct sk_buff *skb)
240 #endif /* CONFIG_LWTUNNEL */
242 #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
244 #endif /* __NET_LWTUNNEL_H */