| #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) |
| #define LWTUNNEL_STATE_XMIT_REDIRECT BIT(2) |
| |
| enum { |
| LWTUNNEL_XMIT_DONE, |
| LWTUNNEL_XMIT_CONTINUE, |
| }; |
| |
| |
| 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; |
| __u16 headroom; |
| __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); |
| int (*xmit)(struct sk_buff *skb); |
| |
| struct module *owner; |
| }; |
| |
| #ifdef CONFIG_LWTUNNEL |
| void lwtstate_free(struct lwtunnel_state *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; |
| } |
| |
| static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) |
| { |
| if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_XMIT_REDIRECT)) |
| return true; |
| |
| return false; |
| } |
| |
| static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, |
| unsigned int mtu) |
| { |
| if (lwtunnel_xmit_redirect(lwtstate) && lwtstate->headroom < mtu) |
| return lwtstate->headroom; |
| |
| return 0; |
| } |
| |
| 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_valid_encap_type(u16 encap_type); |
| int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len); |
| 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); |
| int lwtunnel_xmit(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 bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate) |
| { |
| return false; |
| } |
| |
| static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate, |
| unsigned int mtu) |
| { |
| return 0; |
| } |
| |
| 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_valid_encap_type(u16 encap_type) |
| { |
| return -EOPNOTSUPP; |
| } |
| static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len) |
| { |
| /* return 0 since we are not walking attr looking for |
| * RTA_ENCAP_TYPE attribute on nexthops. |
| */ |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| static inline int lwtunnel_xmit(struct sk_buff *skb) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| #endif /* CONFIG_LWTUNNEL */ |
| |
| #define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type)) |
| |
| #endif /* __NET_LWTUNNEL_H */ |