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 */ unsignedchar 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 */ unsignedchar cp_data[SHA256_DIGEST_SIZE]; /* hash of principal */
} __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));
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