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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 | /* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2021 Samsung Electronics Co., Ltd. */ #ifndef __XATTR_H__ #define __XATTR_H__ /* * These are on-disk structures to store additional metadata into xattr to * reproduce windows filesystem semantics. And they are encoded with NDR to * compatible with samba's xattr meta format. The compatibility with samba * is important because it can lose the information(file attribute, * creation time, acls) about the existing files when switching between * ksmbd and samba. */ /* * Dos attribute flags used for what variable is valid. */ enum { XATTR_DOSINFO_ATTRIB = 0x00000001, XATTR_DOSINFO_EA_SIZE = 0x00000002, XATTR_DOSINFO_SIZE = 0x00000004, XATTR_DOSINFO_ALLOC_SIZE = 0x00000008, XATTR_DOSINFO_CREATE_TIME = 0x00000010, XATTR_DOSINFO_CHANGE_TIME = 0x00000020, XATTR_DOSINFO_ITIME = 0x00000040 }; /* * Dos attribute structure which is compatible with samba's one. * Storing it into the xattr named "DOSATTRIB" separately from inode * allows ksmbd to faithfully reproduce windows filesystem semantics * on top of a POSIX filesystem. */ struct xattr_dos_attrib { __u16 version; /* version 3 or version 4 */ __u32 flags; /* valid flags */ __u32 attr; /* Dos attribute */ __u32 ea_size; /* EA size */ __u64 size; __u64 alloc_size; __u64 create_time; /* File creation time */ __u64 change_time; /* File change time */ __u64 itime; /* Invented/Initial time */ }; /* * Enumeration is used for computing posix acl hash. */ enum { SMB_ACL_TAG_INVALID = 0, SMB_ACL_USER, SMB_ACL_USER_OBJ, SMB_ACL_GROUP, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER, SMB_ACL_MASK }; #define SMB_ACL_READ 4 #define SMB_ACL_WRITE 2 #define SMB_ACL_EXECUTE 1 struct xattr_acl_entry { int type; uid_t uid; gid_t gid; mode_t perm; }; /* * xattr_smb_acl structure is used for computing posix acl hash. */ struct xattr_smb_acl { int count; int next; struct xattr_acl_entry entries[]; }; /* 64bytes hash in xattr_ntacl is computed with sha256 */ #define XATTR_SD_HASH_TYPE_SHA256 0x1 #define XATTR_SD_HASH_SIZE 64 /* * xattr_ntacl is used for storing ntacl and hashes. * Hash is used for checking valid posix acl and ntacl in xattr. */ struct xattr_ntacl { __u16 version; /* version 4*/ void *sd_buf; __u32 sd_size; __u16 hash_type; /* hash type */ __u8 desc[10]; /* posix_acl description */ __u16 desc_len; __u64 current_time; __u8 hash[XATTR_SD_HASH_SIZE]; /* 64bytes hash for ntacl */ __u8 posix_acl_hash[XATTR_SD_HASH_SIZE]; /* 64bytes hash for posix acl */ }; /* DOS ATTRIBUITE XATTR PREFIX */ #define DOS_ATTRIBUTE_PREFIX "DOSATTRIB" #define DOS_ATTRIBUTE_PREFIX_LEN (sizeof(DOS_ATTRIBUTE_PREFIX) - 1) #define XATTR_NAME_DOS_ATTRIBUTE (XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) #define XATTR_NAME_DOS_ATTRIBUTE_LEN \ (sizeof(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) - 1) /* STREAM XATTR PREFIX */ #define STREAM_PREFIX "DosStream." #define STREAM_PREFIX_LEN (sizeof(STREAM_PREFIX) - 1) #define XATTR_NAME_STREAM (XATTR_USER_PREFIX STREAM_PREFIX) #define XATTR_NAME_STREAM_LEN (sizeof(XATTR_NAME_STREAM) - 1) /* SECURITY DESCRIPTOR(NTACL) XATTR PREFIX */ #define SD_PREFIX "NTACL" #define SD_PREFIX_LEN (sizeof(SD_PREFIX) - 1) #define XATTR_NAME_SD (XATTR_SECURITY_PREFIX SD_PREFIX) #define XATTR_NAME_SD_LEN \ (sizeof(XATTR_SECURITY_PREFIX SD_PREFIX) - 1) #endif /* __XATTR_H__ */ |