1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ISCSI_CHAP_H_
 3#define _ISCSI_CHAP_H_
 4
 5#include <linux/types.h>
 6
 7#define CHAP_DIGEST_UNKNOWN	0
 8#define CHAP_DIGEST_MD5		5
 9#define CHAP_DIGEST_SHA		6
10
11#define CHAP_CHALLENGE_LENGTH	16
12#define CHAP_CHALLENGE_STR_LEN	4096
13#define MAX_RESPONSE_LENGTH	64	/* sufficient for MD5 */
14#define	MAX_CHAP_N_SIZE		512
15
16#define MD5_SIGNATURE_SIZE	16	/* 16 bytes in a MD5 message digest */
17
18#define CHAP_STAGE_CLIENT_A	1
19#define CHAP_STAGE_SERVER_AIC	2
20#define CHAP_STAGE_CLIENT_NR	3
21#define CHAP_STAGE_CLIENT_NRIC	4
22#define CHAP_STAGE_SERVER_NR	5
23
24struct iscsi_node_auth;
25struct iscsi_conn;
26
27extern u32 chap_main_loop(struct iscsi_conn *, struct iscsi_node_auth *, char *, char *,
28				int *, int *);
29
30struct iscsi_chap {
31	unsigned char	digest_type;
32	unsigned char	id;
33	unsigned char	challenge[CHAP_CHALLENGE_LENGTH];
34	unsigned int	authenticate_target;
35	unsigned int	chap_state;
36} ____cacheline_aligned;
37
38#endif   /*** _ISCSI_CHAP_H_ ***/