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2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/include/uapi/linux/nfsd/cld.h
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@@ -26,22 +26,39 @@
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 #include <linux/types.h>
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 /* latest upcall version available */
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-#define CLD_UPCALL_VERSION 1
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+#define CLD_UPCALL_VERSION 2
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 /* defined by RFC3530 */
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 #define NFS4_OPAQUE_LIMIT 1024
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+
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+#ifndef SHA256_DIGEST_SIZE
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+#define SHA256_DIGEST_SIZE      32
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+#endif
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 enum cld_command {
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 	Cld_Create,		/* create a record for this cm_id */
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 	Cld_Remove,		/* remove record of this cm_id */
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 	Cld_Check,		/* is this cm_id allowed? */
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 	Cld_GraceDone,		/* grace period is complete */
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+	Cld_GraceStart,		/* grace start (upload client records) */
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+	Cld_GetVersion,		/* query max supported upcall version */
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 };
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 /* representation of long-form NFSv4 client ID */
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 struct cld_name {
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 	__u16		cn_len;				/* length of cm_id */
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 	unsigned char	cn_id[NFS4_OPAQUE_LIMIT];	/* client-provided */
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+} __attribute__((packed));
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+
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+/* sha256 hash of the kerberos principal */
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+struct cld_princhash {
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+	__u8		cp_len;				/* length of cp_data */
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+	unsigned char	cp_data[SHA256_DIGEST_SIZE];	/* hash of principal */
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+} __attribute__((packed));
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+
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+struct cld_clntinfo {
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+	struct cld_name		cc_name;
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+	struct cld_princhash	cc_princhash;
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 } __attribute__((packed));
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 /* message struct for communication with userspace */
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@@ -53,7 +70,28 @@
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 	union {
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 		__s64		cm_gracetime;	/* grace period start time */
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 		struct cld_name	cm_name;
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+		__u8		cm_version;	/* for getting max version */
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 	} __attribute__((packed)) cm_u;
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 } __attribute__((packed));
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+/* version 2 message can include hash of kerberos principal */
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+struct cld_msg_v2 {
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+	__u8		cm_vers;		/* upcall version */
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+	__u8		cm_cmd;			/* upcall command */
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+	__s16		cm_status;		/* return code */
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+	__u32		cm_xid;			/* transaction id */
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+	union {
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+		struct cld_name	cm_name;
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+		__u8		cm_version;	/* for getting max version */
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+		struct cld_clntinfo cm_clntinfo; /* name & princ hash */
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+	} __attribute__((packed)) cm_u;
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+} __attribute__((packed));
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+
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+struct cld_msg_hdr {
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+	__u8		cm_vers;		/* upcall version */
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+	__u8		cm_cmd;			/* upcall command */
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+	__s16		cm_status;		/* return code */
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+	__u32		cm_xid;			/* transaction id */
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+} __attribute__((packed));
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+
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 #endif /* !_NFSD_CLD_H */