#ifndef _NET_AH_H#define _NET_AH_H #include <linux/skbuff.h> /* This is the maximum truncated ICV length that we know of. */#define MAX_AH_AUTH_LEN	64 struct crypto_ahash; struct ah_data {	int			icv_full_len;	int			icv_trunc_len; 	struct crypto_ahash	*ahash;}; struct ip_auth_hdr; static inline struct ip_auth_hdr *ip_auth_hdr(const struct sk_buff *skb){	return (struct ip_auth_hdr *)skb_transport_header(skb);} #endif