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#ifndef _NET_ESP_H
#define _NET_ESP_H
 
#include <linux/crypto.h>
#include <net/xfrm.h>
#include <linux/scatterlist.h>
 
#define ESP_NUM_FAST_SG		4
 
struct esp_data
{
	struct scatterlist		sgbuf[ESP_NUM_FAST_SG];
 
	/* Confidentiality */
	struct {
		int			padlen;		/* 0..255 */
		/* ivlen is offset from enc_data, where encrypted data start.
		 * It is logically different of crypto_tfm_alg_ivsize(tfm).
		 * We assume that it is either zero (no ivec), or
		 * >= crypto_tfm_alg_ivsize(tfm). */
		int			ivlen;
		int			ivinitted;
		u8			*ivec;		/* ivec buffer */
		struct crypto_blkcipher	*tfm;		/* crypto handle */
	} conf;
 
	/* Integrity. It is active when icv_full_len != 0 */
	struct {
		u8			*work_icv;
		int			icv_full_len;
		int			icv_trunc_len;
		struct crypto_hash	*tfm;
	} auth;
};
 
extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
 
static inline int esp_mac_digest(struct esp_data *esp, struct sk_buff *skb,
				 int offset, int len)
{
	struct hash_desc desc;
	int err;
 
	desc.tfm = esp->auth.tfm;
	desc.flags = 0;
 
	err = crypto_hash_init(&desc);
	if (unlikely(err))
		return err;
	err = skb_icv_walk(skb, &desc, offset, len, crypto_hash_update);
	if (unlikely(err))
		return err;
	return crypto_hash_final(&desc, esp->auth.work_icv);
}
 
struct ip_esp_hdr;
 
static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)
{
	return (struct ip_esp_hdr *)skb_transport_header(skb);
}
 
#endif