1 #ifndef __LINUX_GRE_H 2 #define __LINUX_GRE_H 3 4 #include <linux/skbuff.h> 5 6 #define GREPROTO_CISCO 0 7 #define GREPROTO_PPTP 1 8 #define GREPROTO_MAX 2 9 10 struct gre_protocol { 11 int (*handler)(struct sk_buff *skb); 12 void (*err_handler)(struct sk_buff *skb, u32 info); 13 }; 14 15 int gre_add_protocol(const struct gre_protocol *proto, u8 version); 16 int gre_del_protocol(const struct gre_protocol *proto, u8 version); 17 18 #endif 19