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Diffstat (limited to 'include/uapi/linux/nfsd/nfsfh.h')
| -rw-r--r-- | include/uapi/linux/nfsd/nfsfh.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/include/uapi/linux/nfsd/nfsfh.h b/include/uapi/linux/nfsd/nfsfh.h new file mode 100644 index 000000000000..616e3b396476 --- /dev/null +++ b/include/uapi/linux/nfsd/nfsfh.h @@ -0,0 +1,122 @@ +/* + * include/linux/nfsd/nfsfh.h + * + * This file describes the layout of the file handles as passed + * over the wire. + * + * Earlier versions of knfsd used to sign file handles using keyed MD5 + * or SHA. I've removed this code, because it doesn't give you more + * security than blocking external access to port 2049 on your firewall. + * + * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> + */ + +#ifndef _UAPI_LINUX_NFSD_FH_H +#define _UAPI_LINUX_NFSD_FH_H + +#include <linux/types.h> +#include <linux/nfs.h> +#include <linux/nfs2.h> +#include <linux/nfs3.h> +#include <linux/nfs4.h> + +/* + * This is the old "dentry style" Linux NFSv2 file handle. + * + * The xino and xdev fields are currently used to transport the + * ino/dev of the exported inode. + */ +struct nfs_fhbase_old { + __u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */ + __u32 fb_ino; /* our inode number */ + __u32 fb_dirino; /* dir inode number, 0 for directories */ + __u32 fb_dev; /* our device */ + __u32 fb_xdev; + __u32 fb_xino; + __u32 fb_generation; +}; + +/* + * This is the new flexible, extensible style NFSv2/v3 file handle. + * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000 + * + * The file handle starts with a sequence of four-byte words. + * The first word contains a version number (1) and three descriptor bytes + * that tell how the remaining 3 variable length fields should be handled. + * These three bytes are auth_type, fsid_type and fileid_type. + * + * All four-byte values are in host-byte-order. + * + * The auth_type field specifies how the filehandle can be authenticated + * This might allow a file to be confirmed to be in a writable part of a + * filetree without checking the path from it up to the root. + * Current values: + * 0 - No authentication. fb_auth is 0 bytes long + * Possible future values: + * 1 - 4 bytes taken from MD5 hash of the remainer of the file handle + * prefixed by a secret and with the important export flags. + * + * The fsid_type identifies how the filesystem (or export point) is + * encoded. + * Current values: + * 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number + * NOTE: we cannot use the kdev_t device id value, because kdev_t.h + * says we mustn't. We must break it up and reassemble. + * 1 - 4 byte user specified identifier + * 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED + * 3 - 4 byte device id, encoded for user-space, 4 byte inode number + * 4 - 4 byte inode number and 4 byte uuid + * 5 - 8 byte uuid + * 6 - 16 byte uuid + * 7 - 8 byte inode number and 16 byte uuid + * + * The fileid_type identified how the file within the filesystem is encoded. + * This is (will be) passed to, and set by, the underlying filesystem if it supports + * filehandle operations. The filesystem must not use the value '0' or '0xff' and may + * only use the values 1 and 2 as defined below: + * Current values: + * 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes. + * 1 - 32bit inode number, 32 bit generation number. + * 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number. + * + */ +struct nfs_fhbase_new { + __u8 fb_version; /* == 1, even => nfs_fhbase_old */ + __u8 fb_auth_type; + __u8 fb_fsid_type; + __u8 fb_fileid_type; + __u32 fb_auth[1]; +/* __u32 fb_fsid[0]; floating */ +/* __u32 fb_fileid[0]; floating */ +}; + +struct knfsd_fh { + unsigned int fh_size; /* significant for NFSv3. + * Points to the current size while building + * a new file handle + */ + union { + struct nfs_fhbase_old fh_old; + __u32 fh_pad[NFS4_FHSIZE/4]; + struct nfs_fhbase_new fh_new; + } fh_base; +}; + +#define ofh_dcookie fh_base.fh_old.fb_dcookie +#define ofh_ino fh_base.fh_old.fb_ino +#define ofh_dirino fh_base.fh_old.fb_dirino +#define ofh_dev fh_base.fh_old.fb_dev +#define ofh_xdev fh_base.fh_old.fb_xdev +#define ofh_xino fh_base.fh_old.fb_xino +#define ofh_generation fh_base.fh_old.fb_generation + +#define fh_version fh_base.fh_new.fb_version +#define fh_fsid_type fh_base.fh_new.fb_fsid_type +#define fh_auth_type fh_base.fh_new.fb_auth_type +#define fh_fileid_type fh_base.fh_new.fb_fileid_type +#define fh_auth fh_base.fh_new.fb_auth +#define fh_fsid fh_base.fh_new.fb_auth + + + +#endif /* _UAPI_LINUX_NFSD_FH_H */ |