#ifndef _NET_IPCOMP_H#define _NET_IPCOMP_H #include <linux/types.h> #define IPCOMP_SCRATCH_SIZE     65400 struct crypto_comp; struct ipcomp_data {	u16 threshold;	struct crypto_comp **tfms;}; struct ip_comp_hdr;struct sk_buff; static inline struct ip_comp_hdr *ip_comp_hdr(const struct sk_buff *skb){	return (struct ip_comp_hdr *)skb_transport_header(skb);} #endif