From: Eric Biggers <ebiggers@xxxxxxxxxx> There are going to be more filesystem encryption definitions added, and we don't want to use a disproportionate amount of space in <linux/fs.h> for filesystem encryption stuff. So move the fscrypt definitions to a new header <linux/fscrypt.h>. For compatibility with existing userspace programs which may be including <linux/fs.h>, <linux/fs.h> still includes the new header. (It's debatable whether we really need this, though; the filesystem encryption API is new enough that most if not all programs that are using it have to declare it themselves anyway.) Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> --- include/linux/fscrypt.h | 2 +- include/uapi/linux/fs.h | 50 +++-------------------------------------- include/uapi/linux/fscrypt.h | 53 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 57 insertions(+), 48 deletions(-) create mode 100644 include/uapi/linux/fscrypt.h diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h index 53437bfdfcbc..f7aa7d62e235 100644 --- a/include/linux/fscrypt.h +++ b/include/linux/fscrypt.h @@ -19,7 +19,7 @@ #include <linux/bio.h> #include <linux/dcache.h> #include <crypto/skcipher.h> -#include <uapi/linux/fs.h> +#include <uapi/linux/fscrypt.h> #define FS_CRYPTO_BLOCK_SIZE 16 diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 56235dddea7d..6ecd3ee9960c 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -12,6 +12,9 @@ #include <linux/limits.h> #include <linux/ioctl.h> #include <linux/types.h> +#ifndef __KERNEL__ +#include <linux/fscrypt.h> +#endif /* * It's silly to have NR_OPEN bigger than NR_FILE, but you can change @@ -253,53 +256,6 @@ struct fsxattr { #define FS_IOC_FSGETXATTR _IOR ('X', 31, struct fsxattr) #define FS_IOC_FSSETXATTR _IOW ('X', 32, struct fsxattr) -/* - * File system encryption support - */ -/* Policy provided via an ioctl on the topmost directory */ -#define FS_KEY_DESCRIPTOR_SIZE 8 - -#define FS_POLICY_FLAGS_PAD_4 0x00 -#define FS_POLICY_FLAGS_PAD_8 0x01 -#define FS_POLICY_FLAGS_PAD_16 0x02 -#define FS_POLICY_FLAGS_PAD_32 0x03 -#define FS_POLICY_FLAGS_PAD_MASK 0x03 -#define FS_POLICY_FLAGS_VALID 0x03 - -/* Encryption algorithms */ -#define FS_ENCRYPTION_MODE_INVALID 0 -#define FS_ENCRYPTION_MODE_AES_256_XTS 1 -#define FS_ENCRYPTION_MODE_AES_256_GCM 2 -#define FS_ENCRYPTION_MODE_AES_256_CBC 3 -#define FS_ENCRYPTION_MODE_AES_256_CTS 4 -#define FS_ENCRYPTION_MODE_AES_128_CBC 5 -#define FS_ENCRYPTION_MODE_AES_128_CTS 6 - -struct fscrypt_policy { - __u8 version; - __u8 contents_encryption_mode; - __u8 filenames_encryption_mode; - __u8 flags; - __u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE]; -}; - -#define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy) -#define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) -#define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy) - -/* Parameters for passing an encryption key into the kernel keyring */ -#define FS_KEY_DESC_PREFIX "fscrypt:" -#define FS_KEY_DESC_PREFIX_SIZE 8 - -/* Structure that userspace passes to the kernel keyring */ -#define FS_MAX_KEY_SIZE 64 - -struct fscrypt_key { - __u32 mode; - __u8 raw[FS_MAX_KEY_SIZE]; - __u32 size; -}; - /* * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) * diff --git a/include/uapi/linux/fscrypt.h b/include/uapi/linux/fscrypt.h new file mode 100644 index 000000000000..c09209fc42ea --- /dev/null +++ b/include/uapi/linux/fscrypt.h @@ -0,0 +1,53 @@ +#ifndef _UAPI_LINUX_FSCRYPT_H +#define _UAPI_LINUX_FSCRYPT_H + +#include <linux/types.h> + +/* + * File system encryption support + */ +/* Policy provided via an ioctl on the topmost directory */ +#define FS_KEY_DESCRIPTOR_SIZE 8 + +#define FS_POLICY_FLAGS_PAD_4 0x00 +#define FS_POLICY_FLAGS_PAD_8 0x01 +#define FS_POLICY_FLAGS_PAD_16 0x02 +#define FS_POLICY_FLAGS_PAD_32 0x03 +#define FS_POLICY_FLAGS_PAD_MASK 0x03 +#define FS_POLICY_FLAGS_VALID 0x03 + +/* Encryption algorithms */ +#define FS_ENCRYPTION_MODE_INVALID 0 +#define FS_ENCRYPTION_MODE_AES_256_XTS 1 +#define FS_ENCRYPTION_MODE_AES_256_GCM 2 +#define FS_ENCRYPTION_MODE_AES_256_CBC 3 +#define FS_ENCRYPTION_MODE_AES_256_CTS 4 +#define FS_ENCRYPTION_MODE_AES_128_CBC 5 +#define FS_ENCRYPTION_MODE_AES_128_CTS 6 + +struct fscrypt_policy { + __u8 version; + __u8 contents_encryption_mode; + __u8 filenames_encryption_mode; + __u8 flags; + __u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE]; +}; + +#define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy) +#define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) +#define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy) + +/* Parameters for passing an encryption key into the kernel keyring */ +#define FS_KEY_DESC_PREFIX "fscrypt:" +#define FS_KEY_DESC_PREFIX_SIZE 8 + +/* Structure that userspace passes to the kernel keyring */ +#define FS_MAX_KEY_SIZE 64 + +struct fscrypt_key { + __u32 mode; + __u8 raw[FS_MAX_KEY_SIZE]; + __u32 size; +}; + +#endif /* _UAPI_LINUX_FSCRYPT_H */ -- 2.15.0.rc0.271.g36b669edcc-goog -- To unsubscribe from this list: send the line "unsubscribe linux-fscrypt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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