1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * include/linux/nfsd/export.h
4  *
5  * Public declarations for NFS exports. The definitions for the
6  * syscall interface are in nfsctl.h
7  *
8  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
9  */
10 
11 #ifndef _UAPINFSD_EXPORT_H
12 #define _UAPINFSD_EXPORT_H
13 
14 # include <linux/types.h>
15 
16 /*
17  * Important limits for the exports stuff.
18  */
19 #define NFSCLNT_IDMAX		1024
20 #define NFSCLNT_ADDRMAX		16
21 #define NFSCLNT_KEYMAX		32
22 
23 /*
24  * Export flags.
25  *
26  * Please update the expflags[] array in fs/nfsd/export.c when adding
27  * a new flag.
28  */
29 #define NFSEXP_READONLY		0x0001
30 #define NFSEXP_INSECURE_PORT	0x0002
31 #define NFSEXP_ROOTSQUASH	0x0004
32 #define NFSEXP_ALLSQUASH	0x0008
33 #define NFSEXP_ASYNC		0x0010
34 #define NFSEXP_GATHERED_WRITES	0x0020
35 #define NFSEXP_NOREADDIRPLUS    0x0040
36 #define NFSEXP_SECURITY_LABEL	0x0080
37 /* 0x100 currently unused */
38 #define NFSEXP_NOHIDE		0x0200
39 #define NFSEXP_NOSUBTREECHECK	0x0400
40 #define	NFSEXP_NOAUTHNLM	0x0800		/* Don't authenticate NLM requests - just trust */
41 #define NFSEXP_MSNFS		0x1000	/* do silly things that MS clients expect; no longer supported */
42 #define NFSEXP_FSID		0x2000
43 #define	NFSEXP_CROSSMOUNT	0x4000
44 #define	NFSEXP_NOACL		0x8000	/* reserved for possible ACL related use */
45 /*
46  * The NFSEXP_V4ROOT flag causes the kernel to give access only to NFSv4
47  * clients, and only to the single directory that is the root of the
48  * export; further lookup and readdir operations are treated as if every
49  * subdirectory was a mountpoint, and ignored if they are not themselves
50  * exported.  This is used by nfsd and mountd to construct the NFSv4
51  * pseudofilesystem, which provides access only to paths leading to each
52  * exported filesystem.
53  */
54 #define	NFSEXP_V4ROOT		0x10000
55 #define NFSEXP_PNFS		0x20000
56 
57 /* All flags that we claim to support.  (Note we don't support NOACL.) */
58 #define NFSEXP_ALLFLAGS		0x3FEFF
59 
60 /* The flags that may vary depending on security flavor: */
61 #define NFSEXP_SECINFO_FLAGS	(NFSEXP_READONLY | NFSEXP_ROOTSQUASH \
62 					| NFSEXP_ALLSQUASH \
63 					| NFSEXP_INSECURE_PORT)
64 
65 /*
66  * Transport layer security policies that are permitted to access
67  * an export
68  */
69 #define NFSEXP_XPRTSEC_NONE	0x0001
70 #define NFSEXP_XPRTSEC_TLS	0x0002
71 #define NFSEXP_XPRTSEC_MTLS	0x0004
72 
73 #define NFSEXP_XPRTSEC_NUM	(3)
74 
75 #define NFSEXP_XPRTSEC_ALL	(NFSEXP_XPRTSEC_NONE | \
76 				 NFSEXP_XPRTSEC_TLS | \
77 				 NFSEXP_XPRTSEC_MTLS)
78 
79 #endif /* _UAPINFSD_EXPORT_H */
80