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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
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