---

---

---

001: /*
002:  * include/linux/nfsd/nfsfh.h
003:  *
004:  * This file describes the layout of the file handles as passed
005:  * over the wire.
006:  *
007:  * Earlier versions of knfsd used to sign file handles using keyed MD5
008:  * or SHA. I've removed this code, because it doesn't give you more
009:  * security than blocking external access to port 2049 on your firewall.
010:  *
011:  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
012:  */
013: 
014: #ifndef _LINUX_NFSD_FH_H
015: #define _LINUX_NFSD_FH_H
016: 
017: #include <linux/types.h>
018: #include <linux/nfs.h>
019: #include <linux/nfs2.h>
020: #include <linux/nfs3.h>
021: #include <linux/nfs4.h>
022: 
023: /*
024:  * This is the old "dentry style" Linux NFSv2 file handle.
025:  *
026:  * The xino and xdev fields are currently used to transport the
027:  * ino/dev of the exported inode.
028:  */
029: struct nfs_fhbase_old {
030:         __u32           fb_dcookie;     /* dentry cookie - always 0xfeebbaca */
031:         __u32           fb_ino;         /* our inode number */
032:         __u32           fb_dirino;      /* dir inode number, 0 for directories */
033:         __u32           fb_dev;         /* our device */
034:         __u32           fb_xdev;
035:         __u32           fb_xino;
036:         __u32           fb_generation;
037: };
038: 
039: /*
040:  * This is the new flexible, extensible style NFSv2/v3 file handle.
041:  * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
042:  *
043:  * The file handle starts with a sequence of four-byte words.
044:  * The first word contains a version number (1) and three descriptor bytes
045:  * that tell how the remaining 3 variable length fields should be handled.
046:  * These three bytes are auth_type, fsid_type and fileid_type.
047:  *
048:  * All four-byte values are in host-byte-order.
049:  *
050:  * The auth_type field specifies how the filehandle can be authenticated
051:  * This might allow a file to be confirmed to be in a writable part of a
052:  * filetree without checking the path from it up to the root.
053:  * Current values:
054:  *     0  - No authentication.  fb_auth is 0 bytes long
055:  * Possible future values:
056:  *     1  - 4 bytes taken from MD5 hash of the remainer of the file handle
057:  *          prefixed by a secret and with the important export flags.
058:  *
059:  * The fsid_type identifies how the filesystem (or export point) is
060:  *    encoded.
061:  *  Current values:
062:  *     0  - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
063:  *        NOTE: we cannot use the kdev_t device id value, because kdev_t.h
064:  *              says we mustn't.  We must break it up and reassemble.
065:  *     1  - 4 byte user specified identifier
066:  *     2  - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
067:  *     3  - 4 byte device id, encoded for user-space, 4 byte inode number
068:  *     4  - 4 byte inode number and 4 byte uuid
069:  *     5  - 8 byte uuid
070:  *     6  - 16 byte uuid
071:  *     7  - 8 byte inode number and 16 byte uuid
072:  *
073:  * The fileid_type identified how the file within the filesystem is encoded.
074:  * This is (will be) passed to, and set by, the underlying filesystem if it supports
075:  * filehandle operations.  The filesystem must not use the value '0' or '0xff' and may
076:  * only use the values 1 and 2 as defined below:
077:  *  Current values:
078:  *    0   - The root, or export point, of the filesystem.  fb_fileid is 0 bytes.
079:  *    1   - 32bit inode number, 32 bit generation number.
080:  *    2   - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number.
081:  *
082:  */
083: struct nfs_fhbase_new {
084:         __u8            fb_version;     /* == 1, even => nfs_fhbase_old */
085:         __u8            fb_auth_type;
086:         __u8            fb_fsid_type;
087:         __u8            fb_fileid_type;
088:         __u32           fb_auth[1];
089: /*      __u32           fb_fsid[0]; floating */
090: /*      __u32           fb_fileid[0]; floating */
091: };
092: 
093: struct knfsd_fh {
094:         unsigned int    fh_size;        /* significant for NFSv3.
095:                                          * Points to the current size while building
096:                                          * a new file handle
097:                                          */
098:         union {
099:                 struct nfs_fhbase_old   fh_old;
100:                 __u32                   fh_pad[NFS4_FHSIZE/4];
101:                 struct nfs_fhbase_new   fh_new;
102:         } fh_base;
103: };
104: 
105: #define ofh_dcookie             fh_base.fh_old.fb_dcookie
106: #define ofh_ino                 fh_base.fh_old.fb_ino
107: #define ofh_dirino              fh_base.fh_old.fb_dirino
108: #define ofh_dev                 fh_base.fh_old.fb_dev
109: #define ofh_xdev                fh_base.fh_old.fb_xdev
110: #define ofh_xino                fh_base.fh_old.fb_xino
111: #define ofh_generation          fh_base.fh_old.fb_generation
112: 
113: #define fh_version              fh_base.fh_new.fb_version
114: #define fh_fsid_type            fh_base.fh_new.fb_fsid_type
115: #define fh_auth_type            fh_base.fh_new.fb_auth_type
116: #define fh_fileid_type          fh_base.fh_new.fb_fileid_type
117: #define fh_auth                 fh_base.fh_new.fb_auth
118: #define fh_fsid                 fh_base.fh_new.fb_auth
119: 
120: 
121: 
122: #endif /* _LINUX_NFSD_FH_H */
123: 

---

---

---