/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note *//* * fscrypt user API * * These ioctls can be used on filesystems that support fscrypt.  See the * "User API" section of Documentation/filesystems/fscrypt.rst. */#ifndef _UAPI_LINUX_FSCRYPT_H#define _UAPI_LINUX_FSCRYPT_H #include <linux/ioctl.h>#include <linux/types.h> /* Encryption policy flags */#define FSCRYPT_POLICY_FLAGS_PAD_4		0x00#define FSCRYPT_POLICY_FLAGS_PAD_8		0x01#define FSCRYPT_POLICY_FLAGS_PAD_16		0x02#define FSCRYPT_POLICY_FLAGS_PAD_32		0x03#define FSCRYPT_POLICY_FLAGS_PAD_MASK		0x03#define FSCRYPT_POLICY_FLAG_DIRECT_KEY		0x04#define FSCRYPT_POLICY_FLAG_IV_INO_LBLK_64	0x08#define FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32	0x10 /* Encryption algorithms */#define FSCRYPT_MODE_AES_256_XTS		1#define FSCRYPT_MODE_AES_256_CTS		4#define FSCRYPT_MODE_AES_128_CBC		5#define FSCRYPT_MODE_AES_128_CTS		6#define FSCRYPT_MODE_SM4_XTS			7#define FSCRYPT_MODE_SM4_CTS			8#define FSCRYPT_MODE_ADIANTUM			9#define FSCRYPT_MODE_AES_256_HCTR2		10/* If adding a mode number > 10, update FSCRYPT_MODE_MAX in fscrypt_private.h */ /* * Legacy policy version; ad-hoc KDF and no key verification. * For new encrypted directories, use fscrypt_policy_v2 instead. * * Careful: the .version field for this is actually 0, not 1. */#define FSCRYPT_POLICY_V1		0#define FSCRYPT_KEY_DESCRIPTOR_SIZE	8struct fscrypt_policy_v1 {	__u8 version;	__u8 contents_encryption_mode;	__u8 filenames_encryption_mode;	__u8 flags;	__u8 master_key_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE];}; /* * Process-subscribed "logon" key description prefix and payload format. * Deprecated; prefer FS_IOC_ADD_ENCRYPTION_KEY instead. */#define FSCRYPT_KEY_DESC_PREFIX		"fscrypt:"#define FSCRYPT_KEY_DESC_PREFIX_SIZE	8#define FSCRYPT_MAX_KEY_SIZE		64struct fscrypt_key {	__u32 mode;	__u8 raw[FSCRYPT_MAX_KEY_SIZE];	__u32 size;}; /* * New policy version with HKDF and key verification (recommended). */#define FSCRYPT_POLICY_V2		2#define FSCRYPT_KEY_IDENTIFIER_SIZE	16struct fscrypt_policy_v2 {	__u8 version;	__u8 contents_encryption_mode;	__u8 filenames_encryption_mode;	__u8 flags;	__u8 log2_data_unit_size;	__u8 __reserved[3];	__u8 master_key_identifier[FSCRYPT_KEY_IDENTIFIER_SIZE];}; /* Struct passed to FS_IOC_GET_ENCRYPTION_POLICY_EX */struct fscrypt_get_policy_ex_arg {	__u64 policy_size; /* input/output */	union {		__u8 version;		struct fscrypt_policy_v1 v1;		struct fscrypt_policy_v2 v2;	} policy; /* output */}; /* * v1 policy keys are specified by an arbitrary 8-byte key "descriptor", * matching fscrypt_policy_v1::master_key_descriptor. */#define FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR	1 /* * v2 policy keys are specified by a 16-byte key "identifier" which the kernel * calculates as a cryptographic hash of the key itself, * matching fscrypt_policy_v2::master_key_identifier. */#define FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER	2 /* * Specifies a key, either for v1 or v2 policies.  This doesn't contain the * actual key itself; this is just the "name" of the key. */struct fscrypt_key_specifier {	__u32 type;	/* one of FSCRYPT_KEY_SPEC_TYPE_* */	__u32 __reserved;	union {		__u8 __reserved[32]; /* reserve some extra space */		__u8 descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE];		__u8 identifier[FSCRYPT_KEY_IDENTIFIER_SIZE];	} u;}; /* * Payload of Linux keyring key of type "fscrypt-provisioning", referenced by * fscrypt_add_key_arg::key_id as an alternative to fscrypt_add_key_arg::raw. */struct fscrypt_provisioning_key_payload {	__u32 type;	__u32 __reserved;	__u8 raw[];}; /* Struct passed to FS_IOC_ADD_ENCRYPTION_KEY */struct fscrypt_add_key_arg {	struct fscrypt_key_specifier key_spec;	__u32 raw_size;	__u32 key_id;	__u32 __reserved[8];	__u8 raw[];}; /* Struct passed to FS_IOC_REMOVE_ENCRYPTION_KEY */struct fscrypt_remove_key_arg {	struct fscrypt_key_specifier key_spec;#define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_FILES_BUSY	0x00000001#define FSCRYPT_KEY_REMOVAL_STATUS_FLAG_OTHER_USERS	0x00000002	__u32 removal_status_flags;	/* output */	__u32 __reserved[5];}; /* Struct passed to FS_IOC_GET_ENCRYPTION_KEY_STATUS */struct fscrypt_get_key_status_arg {	/* input */	struct fscrypt_key_specifier key_spec;	__u32 __reserved[6]; 	/* output */#define FSCRYPT_KEY_STATUS_ABSENT		1#define FSCRYPT_KEY_STATUS_PRESENT		2#define FSCRYPT_KEY_STATUS_INCOMPLETELY_REMOVED	3	__u32 status;#define FSCRYPT_KEY_STATUS_FLAG_ADDED_BY_SELF   0x00000001	__u32 status_flags;	__u32 user_count;	__u32 __out_reserved[13];}; #define FS_IOC_SET_ENCRYPTION_POLICY		_IOR('f', 19, struct fscrypt_policy_v1)#define FS_IOC_GET_ENCRYPTION_PWSALT		_IOW('f', 20, __u8[16])#define FS_IOC_GET_ENCRYPTION_POLICY		_IOW('f', 21, struct fscrypt_policy_v1)#define FS_IOC_GET_ENCRYPTION_POLICY_EX		_IOWR('f', 22, __u8[9]) /* size + version */#define FS_IOC_ADD_ENCRYPTION_KEY		_IOWR('f', 23, struct fscrypt_add_key_arg)#define FS_IOC_REMOVE_ENCRYPTION_KEY		_IOWR('f', 24, struct fscrypt_remove_key_arg)#define FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS	_IOWR('f', 25, struct fscrypt_remove_key_arg)#define FS_IOC_GET_ENCRYPTION_KEY_STATUS	_IOWR('f', 26, struct fscrypt_get_key_status_arg)#define FS_IOC_GET_ENCRYPTION_NONCE		_IOR('f', 27, __u8[16]) /**********************************************************************/ /* old names; don't add anything new here! */#ifndef __KERNEL__#define fscrypt_policy			fscrypt_policy_v1#define FS_KEY_DESCRIPTOR_SIZE		FSCRYPT_KEY_DESCRIPTOR_SIZE#define FS_POLICY_FLAGS_PAD_4		FSCRYPT_POLICY_FLAGS_PAD_4#define FS_POLICY_FLAGS_PAD_8		FSCRYPT_POLICY_FLAGS_PAD_8#define FS_POLICY_FLAGS_PAD_16		FSCRYPT_POLICY_FLAGS_PAD_16#define FS_POLICY_FLAGS_PAD_32		FSCRYPT_POLICY_FLAGS_PAD_32#define FS_POLICY_FLAGS_PAD_MASK	FSCRYPT_POLICY_FLAGS_PAD_MASK#define FS_POLICY_FLAG_DIRECT_KEY	FSCRYPT_POLICY_FLAG_DIRECT_KEY#define FS_POLICY_FLAGS_VALID		0x07	/* contains old flags only */#define FS_ENCRYPTION_MODE_INVALID	0	/* never used */#define FS_ENCRYPTION_MODE_AES_256_XTS	FSCRYPT_MODE_AES_256_XTS#define FS_ENCRYPTION_MODE_AES_256_GCM	2	/* never used */#define FS_ENCRYPTION_MODE_AES_256_CBC	3	/* never used */#define FS_ENCRYPTION_MODE_AES_256_CTS	FSCRYPT_MODE_AES_256_CTS#define FS_ENCRYPTION_MODE_AES_128_CBC	FSCRYPT_MODE_AES_128_CBC#define FS_ENCRYPTION_MODE_AES_128_CTS	FSCRYPT_MODE_AES_128_CTS#define FS_ENCRYPTION_MODE_ADIANTUM	FSCRYPT_MODE_ADIANTUM#define FS_KEY_DESC_PREFIX		FSCRYPT_KEY_DESC_PREFIX#define FS_KEY_DESC_PREFIX_SIZE		FSCRYPT_KEY_DESC_PREFIX_SIZE#define FS_MAX_KEY_SIZE			FSCRYPT_MAX_KEY_SIZE#endif /* !__KERNEL__ */ #endif /* _UAPI_LINUX_FSCRYPT_H */