fs, fscrypt: move uapi definitions to new header <linux/fscrypt.h>
More fscrypt definitions are being added, and we shouldn't use a disproportionate amount of space in <linux/fs.h> for fscrypt stuff. So move the fscrypt definitions to a new header <linux/fscrypt.h>. For source compatibility with existing userspace programs, <linux/fs.h> still includes the new header. Reviewed-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Eric Biggers <ebiggers@google.com>alistair/sunxi64-5.4-dsi
Eric Biggers
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29a98c1caf
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7af0ab0d3a
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@ -6603,6 +6603,7 @@ T: git git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt.git
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S: Supported
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F: fs/crypto/
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F: include/linux/fscrypt*.h
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F: include/uapi/linux/fscrypt.h
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F: Documentation/filesystems/fscrypt.rst
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FSI SUBSYSTEM
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@ -16,6 +16,7 @@
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <uapi/linux/fscrypt.h>
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#define FS_CRYPTO_BLOCK_SIZE 16
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@ -13,6 +13,9 @@
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#include <linux/limits.h>
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#ifndef __KERNEL__
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#include <linux/fscrypt.h>
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#endif
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/* Use of MS_* flags within the kernel is restricted to core mount(2) code. */
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#if !defined(__KERNEL__)
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@ -212,57 +215,6 @@ struct fsxattr {
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#define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX])
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#define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX])
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/*
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* File system encryption support
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*/
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/* Policy provided via an ioctl on the topmost directory */
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#define FS_KEY_DESCRIPTOR_SIZE 8
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#define FS_POLICY_FLAGS_PAD_4 0x00
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#define FS_POLICY_FLAGS_PAD_8 0x01
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#define FS_POLICY_FLAGS_PAD_16 0x02
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#define FS_POLICY_FLAGS_PAD_32 0x03
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#define FS_POLICY_FLAGS_PAD_MASK 0x03
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#define FS_POLICY_FLAG_DIRECT_KEY 0x04 /* use master key directly */
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#define FS_POLICY_FLAGS_VALID 0x07
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/* Encryption algorithms */
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#define FS_ENCRYPTION_MODE_INVALID 0
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#define FS_ENCRYPTION_MODE_AES_256_XTS 1
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#define FS_ENCRYPTION_MODE_AES_256_GCM 2
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#define FS_ENCRYPTION_MODE_AES_256_CBC 3
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#define FS_ENCRYPTION_MODE_AES_256_CTS 4
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#define FS_ENCRYPTION_MODE_AES_128_CBC 5
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#define FS_ENCRYPTION_MODE_AES_128_CTS 6
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#define FS_ENCRYPTION_MODE_SPECK128_256_XTS 7 /* Removed, do not use. */
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#define FS_ENCRYPTION_MODE_SPECK128_256_CTS 8 /* Removed, do not use. */
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#define FS_ENCRYPTION_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[FS_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 FS_KEY_DESC_PREFIX "fscrypt:"
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#define FS_KEY_DESC_PREFIX_SIZE 8
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/* Structure that userspace passes to the kernel keyring */
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#define FS_MAX_KEY_SIZE 64
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struct fscrypt_key {
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__u32 mode;
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__u8 raw[FS_MAX_KEY_SIZE];
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__u32 size;
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};
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/*
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* Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
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*
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@ -0,0 +1,61 @@
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/* 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 FS_KEY_DESCRIPTOR_SIZE 8
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/* Encryption policy flags */
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#define FS_POLICY_FLAGS_PAD_4 0x00
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#define FS_POLICY_FLAGS_PAD_8 0x01
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#define FS_POLICY_FLAGS_PAD_16 0x02
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#define FS_POLICY_FLAGS_PAD_32 0x03
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#define FS_POLICY_FLAGS_PAD_MASK 0x03
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#define FS_POLICY_FLAG_DIRECT_KEY 0x04 /* use master key directly */
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#define FS_POLICY_FLAGS_VALID 0x07
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/* Encryption algorithms */
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#define FS_ENCRYPTION_MODE_INVALID 0
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#define FS_ENCRYPTION_MODE_AES_256_XTS 1
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#define FS_ENCRYPTION_MODE_AES_256_GCM 2
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#define FS_ENCRYPTION_MODE_AES_256_CBC 3
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#define FS_ENCRYPTION_MODE_AES_256_CTS 4
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#define FS_ENCRYPTION_MODE_AES_128_CBC 5
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#define FS_ENCRYPTION_MODE_AES_128_CTS 6
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#define FS_ENCRYPTION_MODE_SPECK128_256_XTS 7 /* Removed, do not use. */
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#define FS_ENCRYPTION_MODE_SPECK128_256_CTS 8 /* Removed, do not use. */
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#define FS_ENCRYPTION_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[FS_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 FS_KEY_DESC_PREFIX "fscrypt:"
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#define FS_KEY_DESC_PREFIX_SIZE 8
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/* Structure that userspace passes to the kernel keyring */
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#define FS_MAX_KEY_SIZE 64
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struct fscrypt_key {
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__u32 mode;
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__u8 raw[FS_MAX_KEY_SIZE];
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__u32 size;
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};
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#endif /* _UAPI_LINUX_FSCRYPT_H */
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