diff options
Diffstat (limited to 'kernel/include/net/lwtunnel.h')
| -rw-r--r-- | kernel/include/net/lwtunnel.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/kernel/include/net/lwtunnel.h b/kernel/include/net/lwtunnel.h new file mode 100644 index 000000000..66350ce3e --- /dev/null +++ b/kernel/include/net/lwtunnel.h @@ -0,0 +1,175 @@ +#ifndef __NET_LWTUNNEL_H +#define __NET_LWTUNNEL_H 1 + +#include <linux/lwtunnel.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <net/route.h> + +#define LWTUNNEL_HASH_BITS 7 +#define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS) + +/* lw tunnel state flags */ +#define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0) +#define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1) + +struct lwtunnel_state { + __u16 type; + __u16 flags; + atomic_t refcnt; + int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb); + int (*orig_input)(struct sk_buff *); + int len; + __u8 data[0]; +}; + +struct lwtunnel_encap_ops { + int (*build_state)(struct net_device *dev, struct nlattr *encap, + unsigned int family, const void *cfg, + struct lwtunnel_state **ts); + int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); + int (*input)(struct sk_buff *skb); + int (*fill_encap)(struct sk_buff *skb, + struct lwtunnel_state *lwtstate); + int (*get_encap_size)(struct lwtunnel_state *lwtstate); + int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b); +}; + +#ifdef CONFIG_LWTUNNEL +static inline void lwtstate_free(struct lwtunnel_state *lws) +{ + kfree(lws); +} + +static inline struct lwtunnel_state * +lwtstate_get(struct lwtunnel_state *lws) +{ + if (lws) + atomic_inc(&lws->refcnt); + + return lws; +} + +static inline void lwtstate_put(struct lwtunnel_state *lws) +{ + if (!lws) + return; + + if (atomic_dec_and_test(&lws->refcnt)) + lwtstate_free(lws); +} + +static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) +{ + if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT)) + return true; + + return false; +} + +static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) +{ + if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT)) + return true; + + return false; +} +int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, + unsigned int num); +int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, + unsigned int num); +int lwtunnel_build_state(struct net_device *dev, u16 encap_type, + struct nlattr *encap, + unsigned int family, const void *cfg, + struct lwtunnel_state **lws); +int lwtunnel_fill_encap(struct sk_buff *skb, + struct lwtunnel_state *lwtstate); +int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate); +struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len); +int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b); +int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb); +int lwtunnel_input(struct sk_buff *skb); + +#else + +static inline void lwtstate_free(struct lwtunnel_state *lws) +{ +} + +static inline struct lwtunnel_state * +lwtstate_get(struct lwtunnel_state *lws) +{ + return lws; +} + +static inline void lwtstate_put(struct lwtunnel_state *lws) +{ +} + +static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate) +{ + return false; +} + +static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate) +{ + return false; +} + +static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, + unsigned int num) +{ + return -EOPNOTSUPP; + +} + +static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, + unsigned int num) +{ + return -EOPNOTSUPP; +} + +static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type, + struct nlattr *encap, + unsigned int family, const void *cfg, + struct lwtunnel_state **lws) +{ + return -EOPNOTSUPP; +} + +static inline int lwtunnel_fill_encap(struct sk_buff *skb, + struct lwtunnel_state *lwtstate) +{ + return 0; +} + +static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate) +{ + return 0; +} + +static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len) +{ + return NULL; +} + +static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a, + struct lwtunnel_state *b) +{ + return 0; +} + +static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb) +{ + return -EOPNOTSUPP; +} + +static inline int lwtunnel_input(struct sk_buff *skb) +{ + return -EOPNOTSUPP; +} + +#endif + +#endif /* __NET_LWTUNNEL_H */ |