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1/*
2 * include/linux/nfsd/export.h
3 *
4 * Public declarations for NFS exports. The definitions for the
5 * syscall interface are in nfsctl.h
6 *
7 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
8 */
9
10#ifndef NFSD_EXPORT_H
11#define NFSD_EXPORT_H
12
13# include <linux/types.h>
14#ifdef __KERNEL__
15# include <linux/nfsd/nfsfh.h>
16#endif
17
18/*
19 * Important limits for the exports stuff.
20 */
21#define NFSCLNT_IDMAX 1024
22#define NFSCLNT_ADDRMAX 16
23#define NFSCLNT_KEYMAX 32
24
25/*
26 * Export flags.
27 */
28#define NFSEXP_READONLY 0x0001
29#define NFSEXP_INSECURE_PORT 0x0002
30#define NFSEXP_ROOTSQUASH 0x0004
31#define NFSEXP_ALLSQUASH 0x0008
32#define NFSEXP_ASYNC 0x0010
33#define NFSEXP_GATHERED_WRITES 0x0020
34/* 40 80 100 currently unused */
35#define NFSEXP_NOHIDE 0x0200
36#define NFSEXP_NOSUBTREECHECK 0x0400
37#define NFSEXP_NOAUTHNLM 0x0800 /* Don't authenticate NLM requests - just trust */
38#define NFSEXP_MSNFS 0x1000 /* do silly things that MS clients expect; no longer supported */
39#define NFSEXP_FSID 0x2000
40#define NFSEXP_CROSSMOUNT 0x4000
41#define NFSEXP_NOACL 0x8000 /* reserved for possible ACL related use */
42/*
43 * The NFSEXP_V4ROOT flag causes the kernel to give access only to NFSv4
44 * clients, and only to the single directory that is the root of the
45 * export; further lookup and readdir operations are treated as if every
46 * subdirectory was a mountpoint, and ignored if they are not themselves
47 * exported. This is used by nfsd and mountd to construct the NFSv4
48 * pseudofilesystem, which provides access only to paths leading to each
49 * exported filesystem.
50 */
51#define NFSEXP_V4ROOT 0x10000
52/* All flags that we claim to support. (Note we don't support NOACL.) */
53#define NFSEXP_ALLFLAGS 0x17E3F
54
55/* The flags that may vary depending on security flavor: */
56#define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \
57 | NFSEXP_ALLSQUASH \
58 | NFSEXP_INSECURE_PORT)
59
60#ifdef __KERNEL__
61
62/*
63 * FS Locations
64 */
65
66#define MAX_FS_LOCATIONS 128
67
68struct nfsd4_fs_location {
69 char *hosts; /* colon separated list of hosts */
70 char *path; /* slash separated list of path components */
71};
72
73struct nfsd4_fs_locations {
74 uint32_t locations_count;
75 struct nfsd4_fs_location *locations;
76/* If we're not actually serving this data ourselves (only providing a
77 * list of replicas that do serve it) then we set "migrated": */
78 int migrated;
79};
80
81/*
82 * We keep an array of pseudoflavors with the export, in order from most
83 * to least preferred. For the foreseeable future, we don't expect more
84 * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
85 * spkm3i, and spkm3p (and using all 8 at once should be rare).
86 */
87#define MAX_SECINFO_LIST 8
88
89struct exp_flavor_info {
90 u32 pseudoflavor;
91 u32 flags;
92};
93
94struct svc_export {
95 struct cache_head h;
96 struct auth_domain * ex_client;
97 int ex_flags;
98 struct path ex_path;
99 uid_t ex_anon_uid;
100 gid_t ex_anon_gid;
101 int ex_fsid;
102 unsigned char * ex_uuid; /* 16 byte fsid */
103 struct nfsd4_fs_locations ex_fslocs;
104 int ex_nflavors;
105 struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
106};
107
108/* an "export key" (expkey) maps a filehandlefragement to an
109 * svc_export for a given client. There can be several per export,
110 * for the different fsid types.
111 */
112struct svc_expkey {
113 struct cache_head h;
114
115 struct auth_domain * ek_client;
116 int ek_fsidtype;
117 u32 ek_fsid[6];
118
119 struct path ek_path;
120};
121
122#define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
123#define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
124#define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
125
126int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
127__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
128
129/*
130 * Function declarations
131 */
132int nfsd_export_init(void);
133void nfsd_export_shutdown(void);
134void nfsd_export_flush(void);
135struct svc_export * rqst_exp_get_by_name(struct svc_rqst *,
136 struct path *);
137struct svc_export * rqst_exp_parent(struct svc_rqst *,
138 struct path *);
139struct svc_export * rqst_find_fsidzero_export(struct svc_rqst *);
140int exp_rootfh(struct auth_domain *,
141 char *path, struct knfsd_fh *, int maxsize);
142__be32 exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
143__be32 nfserrno(int errno);
144
145extern struct cache_detail svc_export_cache;
146
147static inline void exp_put(struct svc_export *exp)
148{
149 cache_put(&exp->h, &svc_export_cache);
150}
151
152static inline void exp_get(struct svc_export *exp)
153{
154 cache_get(&exp->h);
155}
156struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
157
158#endif /* __KERNEL__ */
159
160#endif /* NFSD_EXPORT_H */
161