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2336d0deb2
Prefix all filesystem encryption UAPI constants except the ioctl numbers with "FSCRYPT_" rather than with "FS_". This namespaces the constants more appropriately and makes it clear that they are related specifically to the filesystem encryption feature, and to the 'fscrypt_*' structures. With some of the old names like "FS_POLICY_FLAGS_VALID", it was not immediately clear that the constant had anything to do with encryption. This is also useful because we'll be adding more encryption-related constants, e.g. for the policy version, and we'd otherwise have to choose whether to use unclear names like FS_POLICY_V1 or inconsistent names like FS_ENCRYPTION_POLICY_V1. For source compatibility with existing userspace programs, keep the old names defined as aliases to the new names. Finally, as long as new names are being defined anyway, I skipped defining new names for the fscrypt mode numbers that aren't actually used: INVALID (0), AES_256_GCM (2), AES_256_CBC (3), SPECK128_256_XTS (7), and SPECK128_256_CTS (8). Reviewed-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Eric Biggers <ebiggers@google.com>
81 lines
3.0 KiB
C
81 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* fscrypt user API
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*
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* These ioctls can be used on filesystems that support fscrypt. See the
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* "User API" section of Documentation/filesystems/fscrypt.rst.
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*/
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#ifndef _UAPI_LINUX_FSCRYPT_H
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#define _UAPI_LINUX_FSCRYPT_H
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#include <linux/types.h>
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#define FSCRYPT_KEY_DESCRIPTOR_SIZE 8
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/* Encryption policy flags */
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#define FSCRYPT_POLICY_FLAGS_PAD_4 0x00
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#define FSCRYPT_POLICY_FLAGS_PAD_8 0x01
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#define FSCRYPT_POLICY_FLAGS_PAD_16 0x02
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#define FSCRYPT_POLICY_FLAGS_PAD_32 0x03
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#define FSCRYPT_POLICY_FLAGS_PAD_MASK 0x03
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#define FSCRYPT_POLICY_FLAG_DIRECT_KEY 0x04 /* use master key directly */
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#define FSCRYPT_POLICY_FLAGS_VALID 0x07
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/* Encryption algorithms */
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#define FSCRYPT_MODE_AES_256_XTS 1
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#define FSCRYPT_MODE_AES_256_CTS 4
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#define FSCRYPT_MODE_AES_128_CBC 5
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#define FSCRYPT_MODE_AES_128_CTS 6
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#define FSCRYPT_MODE_ADIANTUM 9
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struct fscrypt_policy {
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__u8 version;
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__u8 contents_encryption_mode;
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__u8 filenames_encryption_mode;
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__u8 flags;
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__u8 master_key_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE];
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};
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#define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy)
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#define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
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#define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy)
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/* Parameters for passing an encryption key into the kernel keyring */
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#define FSCRYPT_KEY_DESC_PREFIX "fscrypt:"
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#define FSCRYPT_KEY_DESC_PREFIX_SIZE 8
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/* Structure that userspace passes to the kernel keyring */
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#define FSCRYPT_MAX_KEY_SIZE 64
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struct fscrypt_key {
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__u32 mode;
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__u8 raw[FSCRYPT_MAX_KEY_SIZE];
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__u32 size;
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};
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/**********************************************************************/
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/* old names; don't add anything new here! */
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#define FS_KEY_DESCRIPTOR_SIZE FSCRYPT_KEY_DESCRIPTOR_SIZE
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#define FS_POLICY_FLAGS_PAD_4 FSCRYPT_POLICY_FLAGS_PAD_4
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#define FS_POLICY_FLAGS_PAD_8 FSCRYPT_POLICY_FLAGS_PAD_8
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#define FS_POLICY_FLAGS_PAD_16 FSCRYPT_POLICY_FLAGS_PAD_16
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#define FS_POLICY_FLAGS_PAD_32 FSCRYPT_POLICY_FLAGS_PAD_32
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#define FS_POLICY_FLAGS_PAD_MASK FSCRYPT_POLICY_FLAGS_PAD_MASK
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#define FS_POLICY_FLAG_DIRECT_KEY FSCRYPT_POLICY_FLAG_DIRECT_KEY
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#define FS_POLICY_FLAGS_VALID FSCRYPT_POLICY_FLAGS_VALID
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#define FS_ENCRYPTION_MODE_INVALID 0 /* never used */
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#define FS_ENCRYPTION_MODE_AES_256_XTS FSCRYPT_MODE_AES_256_XTS
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#define FS_ENCRYPTION_MODE_AES_256_GCM 2 /* never used */
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#define FS_ENCRYPTION_MODE_AES_256_CBC 3 /* never used */
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#define FS_ENCRYPTION_MODE_AES_256_CTS FSCRYPT_MODE_AES_256_CTS
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#define FS_ENCRYPTION_MODE_AES_128_CBC FSCRYPT_MODE_AES_128_CBC
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#define FS_ENCRYPTION_MODE_AES_128_CTS FSCRYPT_MODE_AES_128_CTS
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#define FS_ENCRYPTION_MODE_SPECK128_256_XTS 7 /* removed */
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#define FS_ENCRYPTION_MODE_SPECK128_256_CTS 8 /* removed */
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#define FS_ENCRYPTION_MODE_ADIANTUM FSCRYPT_MODE_ADIANTUM
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#define FS_KEY_DESC_PREFIX FSCRYPT_KEY_DESC_PREFIX
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#define FS_KEY_DESC_PREFIX_SIZE FSCRYPT_KEY_DESC_PREFIX_SIZE
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#define FS_MAX_KEY_SIZE FSCRYPT_MAX_KEY_SIZE
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#endif /* _UAPI_LINUX_FSCRYPT_H */
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