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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
* Upcall description for nfsdcld communication
*
* Copyright (c) 2012 Red Hat, Inc.
* Author(s): Jeff Layton <jlayton@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _NFSD_CLD_H
#define _NFSD_CLD_H
#include <linux/types.h>
/* latest upcall version available */
#define CLD_UPCALL_VERSION 2
/* defined by RFC3530 */
#define NFS4_OPAQUE_LIMIT 1024
#ifndef SHA256_DIGEST_SIZE
#define SHA256_DIGEST_SIZE 32
#endif
enum cld_command {
Cld_Create, /* create a record for this cm_id */
Cld_Remove, /* remove record of this cm_id */
Cld_Check, /* is this cm_id allowed? */
Cld_GraceDone, /* grace period is complete */
Cld_GraceStart, /* grace start (upload client records) */
Cld_GetVersion, /* query max supported upcall version */
};
/* representation of long-form NFSv4 client ID */
struct cld_name {
__u16 cn_len; /* length of cm_id */
unsigned char cn_id[NFS4_OPAQUE_LIMIT]; /* client-provided */
} __attribute__((packed));
/* sha256 hash of the kerberos principal */
struct cld_princhash {
__u8 cp_len; /* length of cp_data */
unsigned char cp_data[SHA256_DIGEST_SIZE]; /* hash of principal */
} __attribute__((packed));
struct cld_clntinfo {
struct cld_name cc_name;
struct cld_princhash cc_princhash;
} __attribute__((packed));
/* message struct for communication with userspace */
struct cld_msg {
__u8 cm_vers; /* upcall version */
__u8 cm_cmd; /* upcall command */
__s16 cm_status; /* return code */
__u32 cm_xid; /* transaction id */
union {
__s64 cm_gracetime; /* grace period start time */
struct cld_name cm_name;
__u8 cm_version; /* for getting max version */
} __attribute__((packed)) cm_u;
} __attribute__((packed));
/* version 2 message can include hash of kerberos principal */
struct cld_msg_v2 {
__u8 cm_vers; /* upcall version */
__u8 cm_cmd; /* upcall command */
__s16 cm_status; /* return code */
__u32 cm_xid; /* transaction id */
union {
struct cld_name cm_name;
__u8 cm_version; /* for getting max version */
struct cld_clntinfo cm_clntinfo; /* name & princ hash */
} __attribute__((packed)) cm_u;
} __attribute__((packed));
struct cld_msg_hdr {
__u8 cm_vers; /* upcall version */
__u8 cm_cmd; /* upcall command */
__s16 cm_status; /* return code */
__u32 cm_xid; /* transaction id */
} __attribute__((packed));
#endif /* !_NFSD_CLD_H */
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