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
68 struct nfsd4_fs_location {
69 char *hosts; /* colon separated list of hosts */
70 char *path; /* slash separated list of path components */
71 };
72
73 struct 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
89 struct exp_flavor_info {
90 u32 pseudoflavor;
91 u32 flags;
92 };
93
94 struct svc_export {
95 struct cache_head h;
96 struct auth_domain * ex_client;
97 int ex_flags;
98 struct path ex_path;
99 char *ex_pathname;
100 uid_t ex_anon_uid;
101 gid_t ex_anon_gid;
102 int ex_fsid;
103 unsigned char * ex_uuid; /* 16 byte fsid */
104 struct nfsd4_fs_locations ex_fslocs;
105 int ex_nflavors;
106 struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
107 };
108
109 /* an "export key" (expkey) maps a filehandlefragement to an
110 * svc_export for a given client. There can be several per export,
111 * for the different fsid types.
112 */
113 struct svc_expkey {
114 struct cache_head h;
115
116 struct auth_domain * ek_client;
117 int ek_fsidtype;
118 u32 ek_fsid[6];
119
120 struct path ek_path;
121 };
122
123 #define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
124 #define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
125 #define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
126
127 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
128 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
129
130 /*
131 * Function declarations
132 */
133 int nfsd_export_init(void);
134 void nfsd_export_shutdown(void);
135 void nfsd_export_flush(void);
136 void exp_readlock(void);
137 void exp_readunlock(void);
138 struct svc_export * rqst_exp_get_by_name(struct svc_rqst *,
139 struct path *);
140 struct svc_export * rqst_exp_parent(struct svc_rqst *,
141 struct path *);
142 int exp_rootfh(struct auth_domain *,
143 char *path, struct knfsd_fh *, int maxsize);
144 __be32 exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
145 __be32 nfserrno(int errno);
146
147 extern struct cache_detail svc_export_cache;
148
exp_put(struct svc_export * exp)149 static inline void exp_put(struct svc_export *exp)
150 {
151 cache_put(&exp->h, &svc_export_cache);
152 }
153
exp_get(struct svc_export * exp)154 static inline void exp_get(struct svc_export *exp)
155 {
156 cache_get(&exp->h);
157 }
158 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
159
160 #endif /* __KERNEL__ */
161
162 #endif /* NFSD_EXPORT_H */
163
164