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#ifndef _NET_AH_H
#define _NET_AH_H
 
#include <linux/crypto.h>
#include <net/xfrm.h>
 
/* This is the maximum truncated ICV length that we know of. */
#define MAX_AH_AUTH_LEN	12
 
struct ah_data
{
	u8			*work_icv;
	int			icv_full_len;
	int			icv_trunc_len;
 
	struct crypto_hash	*tfm;
};
 
static inline int ah_mac_digest(struct ah_data *ahp, struct sk_buff *skb,
				u8 *auth_data)
{
	struct hash_desc desc;
	int err;
 
	desc.tfm = ahp->tfm;
	desc.flags = 0;
 
	memset(auth_data, 0, ahp->icv_trunc_len);
	err = crypto_hash_init(&desc);
	if (unlikely(err))
		goto out;
	err = skb_icv_walk(skb, &desc, 0, skb->len, crypto_hash_update);
	if (unlikely(err))
		goto out;
	err = crypto_hash_final(&desc, ahp->work_icv);
 
out:
	return err;
}
 
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