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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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