nfsd: restrict filehandles accepted in V4ROOT case
[linux-2.6.git] / fs / nfsd / nfsd.h
1 /*
2  * linux/include/linux/nfsd/nfsd.h
3  *
4  * Hodge-podge collection of knfsd-related stuff.
5  * I will sort this out later.
6  *
7  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
8  */
9
10 #ifndef LINUX_NFSD_NFSD_H
11 #define LINUX_NFSD_NFSD_H
12
13 #include <linux/types.h>
14 #include <linux/mount.h>
15
16 #include <linux/nfsd/debug.h>
17 #include <linux/nfsd/export.h>
18 #include <linux/nfsd/stats.h>
19 /*
20  * nfsd version
21  */
22 #define NFSD_SUPPORTED_MINOR_VERSION    1
23
24 struct readdir_cd {
25         __be32                  err;    /* 0, nfserr, or nfserr_eof */
26 };
27
28
29 extern struct svc_program       nfsd_program;
30 extern struct svc_version       nfsd_version2, nfsd_version3,
31                                 nfsd_version4;
32 extern u32                      nfsd_supported_minorversion;
33 extern struct mutex             nfsd_mutex;
34 extern struct svc_serv          *nfsd_serv;
35 extern spinlock_t               nfsd_drc_lock;
36 extern unsigned int             nfsd_drc_max_mem;
37 extern unsigned int             nfsd_drc_mem_used;
38
39 extern const struct seq_operations nfs_exports_op;
40
41 /*
42  * Function prototypes.
43  */
44 int             nfsd_svc(unsigned short port, int nrservs);
45 int             nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
46
47 int             nfsd_nrthreads(void);
48 int             nfsd_nrpools(void);
49 int             nfsd_get_nrthreads(int n, int *);
50 int             nfsd_set_nrthreads(int n, int *);
51
52 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
53 #ifdef CONFIG_NFSD_V2_ACL
54 extern struct svc_version nfsd_acl_version2;
55 #else
56 #define nfsd_acl_version2 NULL
57 #endif
58 #ifdef CONFIG_NFSD_V3_ACL
59 extern struct svc_version nfsd_acl_version3;
60 #else
61 #define nfsd_acl_version3 NULL
62 #endif
63 #endif
64
65 enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
66 int nfsd_vers(int vers, enum vers_op change);
67 int nfsd_minorversion(u32 minorversion, enum vers_op change);
68 void nfsd_reset_versions(void);
69 int nfsd_create_serv(void);
70
71 extern int nfsd_max_blksize;
72
73 static inline int nfsd_v4client(struct svc_rqst *rq)
74 {
75         return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
76 }
77
78 /* 
79  * NFSv4 State
80  */
81 #ifdef CONFIG_NFSD_V4
82 extern unsigned int max_delegations;
83 int nfs4_state_init(void);
84 void nfsd4_free_slabs(void);
85 int nfs4_state_start(void);
86 void nfs4_state_shutdown(void);
87 time_t nfs4_lease_time(void);
88 void nfs4_reset_lease(time_t leasetime);
89 int nfs4_reset_recoverydir(char *recdir);
90 #else
91 static inline int nfs4_state_init(void) { return 0; }
92 static inline void nfsd4_free_slabs(void) { }
93 static inline int nfs4_state_start(void) { return 0; }
94 static inline void nfs4_state_shutdown(void) { }
95 static inline time_t nfs4_lease_time(void) { return 0; }
96 static inline void nfs4_reset_lease(time_t leasetime) { }
97 static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
98 #endif
99
100 /*
101  * lockd binding
102  */
103 void            nfsd_lockd_init(void);
104 void            nfsd_lockd_shutdown(void);
105
106
107 /*
108  * These macros provide pre-xdr'ed values for faster operation.
109  */
110 #define nfs_ok                  cpu_to_be32(NFS_OK)
111 #define nfserr_perm             cpu_to_be32(NFSERR_PERM)
112 #define nfserr_noent            cpu_to_be32(NFSERR_NOENT)
113 #define nfserr_io               cpu_to_be32(NFSERR_IO)
114 #define nfserr_nxio             cpu_to_be32(NFSERR_NXIO)
115 #define nfserr_eagain           cpu_to_be32(NFSERR_EAGAIN)
116 #define nfserr_acces            cpu_to_be32(NFSERR_ACCES)
117 #define nfserr_exist            cpu_to_be32(NFSERR_EXIST)
118 #define nfserr_xdev             cpu_to_be32(NFSERR_XDEV)
119 #define nfserr_nodev            cpu_to_be32(NFSERR_NODEV)
120 #define nfserr_notdir           cpu_to_be32(NFSERR_NOTDIR)
121 #define nfserr_isdir            cpu_to_be32(NFSERR_ISDIR)
122 #define nfserr_inval            cpu_to_be32(NFSERR_INVAL)
123 #define nfserr_fbig             cpu_to_be32(NFSERR_FBIG)
124 #define nfserr_nospc            cpu_to_be32(NFSERR_NOSPC)
125 #define nfserr_rofs             cpu_to_be32(NFSERR_ROFS)
126 #define nfserr_mlink            cpu_to_be32(NFSERR_MLINK)
127 #define nfserr_opnotsupp        cpu_to_be32(NFSERR_OPNOTSUPP)
128 #define nfserr_nametoolong      cpu_to_be32(NFSERR_NAMETOOLONG)
129 #define nfserr_notempty         cpu_to_be32(NFSERR_NOTEMPTY)
130 #define nfserr_dquot            cpu_to_be32(NFSERR_DQUOT)
131 #define nfserr_stale            cpu_to_be32(NFSERR_STALE)
132 #define nfserr_remote           cpu_to_be32(NFSERR_REMOTE)
133 #define nfserr_wflush           cpu_to_be32(NFSERR_WFLUSH)
134 #define nfserr_badhandle        cpu_to_be32(NFSERR_BADHANDLE)
135 #define nfserr_notsync          cpu_to_be32(NFSERR_NOT_SYNC)
136 #define nfserr_badcookie        cpu_to_be32(NFSERR_BAD_COOKIE)
137 #define nfserr_notsupp          cpu_to_be32(NFSERR_NOTSUPP)
138 #define nfserr_toosmall         cpu_to_be32(NFSERR_TOOSMALL)
139 #define nfserr_serverfault      cpu_to_be32(NFSERR_SERVERFAULT)
140 #define nfserr_badtype          cpu_to_be32(NFSERR_BADTYPE)
141 #define nfserr_jukebox          cpu_to_be32(NFSERR_JUKEBOX)
142 #define nfserr_denied           cpu_to_be32(NFSERR_DENIED)
143 #define nfserr_deadlock         cpu_to_be32(NFSERR_DEADLOCK)
144 #define nfserr_expired          cpu_to_be32(NFSERR_EXPIRED)
145 #define nfserr_bad_cookie       cpu_to_be32(NFSERR_BAD_COOKIE)
146 #define nfserr_same             cpu_to_be32(NFSERR_SAME)
147 #define nfserr_clid_inuse       cpu_to_be32(NFSERR_CLID_INUSE)
148 #define nfserr_stale_clientid   cpu_to_be32(NFSERR_STALE_CLIENTID)
149 #define nfserr_resource         cpu_to_be32(NFSERR_RESOURCE)
150 #define nfserr_moved            cpu_to_be32(NFSERR_MOVED)
151 #define nfserr_nofilehandle     cpu_to_be32(NFSERR_NOFILEHANDLE)
152 #define nfserr_minor_vers_mismatch      cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
153 #define nfserr_share_denied     cpu_to_be32(NFSERR_SHARE_DENIED)
154 #define nfserr_stale_stateid    cpu_to_be32(NFSERR_STALE_STATEID)
155 #define nfserr_old_stateid      cpu_to_be32(NFSERR_OLD_STATEID)
156 #define nfserr_bad_stateid      cpu_to_be32(NFSERR_BAD_STATEID)
157 #define nfserr_bad_seqid        cpu_to_be32(NFSERR_BAD_SEQID)
158 #define nfserr_symlink          cpu_to_be32(NFSERR_SYMLINK)
159 #define nfserr_not_same         cpu_to_be32(NFSERR_NOT_SAME)
160 #define nfserr_restorefh        cpu_to_be32(NFSERR_RESTOREFH)
161 #define nfserr_attrnotsupp      cpu_to_be32(NFSERR_ATTRNOTSUPP)
162 #define nfserr_bad_xdr          cpu_to_be32(NFSERR_BAD_XDR)
163 #define nfserr_openmode         cpu_to_be32(NFSERR_OPENMODE)
164 #define nfserr_locks_held       cpu_to_be32(NFSERR_LOCKS_HELD)
165 #define nfserr_op_illegal       cpu_to_be32(NFSERR_OP_ILLEGAL)
166 #define nfserr_grace            cpu_to_be32(NFSERR_GRACE)
167 #define nfserr_no_grace         cpu_to_be32(NFSERR_NO_GRACE)
168 #define nfserr_reclaim_bad      cpu_to_be32(NFSERR_RECLAIM_BAD)
169 #define nfserr_badname          cpu_to_be32(NFSERR_BADNAME)
170 #define nfserr_cb_path_down     cpu_to_be32(NFSERR_CB_PATH_DOWN)
171 #define nfserr_locked           cpu_to_be32(NFSERR_LOCKED)
172 #define nfserr_wrongsec         cpu_to_be32(NFSERR_WRONGSEC)
173 #define nfserr_badiomode                cpu_to_be32(NFS4ERR_BADIOMODE)
174 #define nfserr_badlayout                cpu_to_be32(NFS4ERR_BADLAYOUT)
175 #define nfserr_bad_session_digest       cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
176 #define nfserr_badsession               cpu_to_be32(NFS4ERR_BADSESSION)
177 #define nfserr_badslot                  cpu_to_be32(NFS4ERR_BADSLOT)
178 #define nfserr_complete_already         cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
179 #define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
180 #define nfserr_deleg_already_wanted     cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
181 #define nfserr_back_chan_busy           cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
182 #define nfserr_layouttrylater           cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
183 #define nfserr_layoutunavailable        cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
184 #define nfserr_nomatching_layout        cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
185 #define nfserr_recallconflict           cpu_to_be32(NFS4ERR_RECALLCONFLICT)
186 #define nfserr_unknown_layouttype       cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
187 #define nfserr_seq_misordered           cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
188 #define nfserr_sequence_pos             cpu_to_be32(NFS4ERR_SEQUENCE_POS)
189 #define nfserr_req_too_big              cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
190 #define nfserr_rep_too_big              cpu_to_be32(NFS4ERR_REP_TOO_BIG)
191 #define nfserr_rep_too_big_to_cache     cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
192 #define nfserr_retry_uncached_rep       cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
193 #define nfserr_unsafe_compound          cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
194 #define nfserr_too_many_ops             cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
195 #define nfserr_op_not_in_session        cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
196 #define nfserr_hash_alg_unsupp          cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
197 #define nfserr_clientid_busy            cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
198 #define nfserr_pnfs_io_hole             cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
199 #define nfserr_seq_false_retry          cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
200 #define nfserr_bad_high_slot            cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
201 #define nfserr_deadsession              cpu_to_be32(NFS4ERR_DEADSESSION)
202 #define nfserr_encr_alg_unsupp          cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
203 #define nfserr_pnfs_no_layout           cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
204 #define nfserr_not_only_op              cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
205 #define nfserr_wrong_cred               cpu_to_be32(NFS4ERR_WRONG_CRED)
206 #define nfserr_wrong_type               cpu_to_be32(NFS4ERR_WRONG_TYPE)
207 #define nfserr_dirdeleg_unavail         cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
208 #define nfserr_reject_deleg             cpu_to_be32(NFS4ERR_REJECT_DELEG)
209 #define nfserr_returnconflict           cpu_to_be32(NFS4ERR_RETURNCONFLICT)
210 #define nfserr_deleg_revoked            cpu_to_be32(NFS4ERR_DELEG_REVOKED)
211
212 /* error codes for internal use */
213 /* if a request fails due to kmalloc failure, it gets dropped.
214  *  Client should resend eventually
215  */
216 #define nfserr_dropit           cpu_to_be32(30000)
217 /* end-of-file indicator in readdir */
218 #define nfserr_eof              cpu_to_be32(30001)
219 /* replay detected */
220 #define nfserr_replay_me        cpu_to_be32(11001)
221 /* nfs41 replay detected */
222 #define nfserr_replay_cache     cpu_to_be32(11002)
223
224 /* Check for dir entries '.' and '..' */
225 #define isdotent(n, l)  (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
226
227 /*
228  * Time of server startup
229  */
230 extern struct timeval   nfssvc_boot;
231
232 #ifdef CONFIG_NFSD_V4
233
234 /* before processing a COMPOUND operation, we have to check that there
235  * is enough space in the buffer for XDR encode to succeed.  otherwise,
236  * we might process an operation with side effects, and be unable to
237  * tell the client that the operation succeeded.
238  *
239  * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
240  * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
241  * READ, READDIR, and READLINK have their own buffer checks.)  if we
242  * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
243  *
244  * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
245  * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
246  * care is taken to ensure that we never fall below this level for any
247  * reason.
248  */
249 #define COMPOUND_SLACK_SPACE            140    /* OP_GETFH */
250 #define COMPOUND_ERR_SLACK_SPACE        12     /* OP_SETATTR */
251
252 #define NFSD_LEASE_TIME                 (nfs4_lease_time())
253 #define NFSD_LAUNDROMAT_MINTIMEOUT      10   /* seconds */
254
255 /*
256  * The following attributes are currently not supported by the NFSv4 server:
257  *    ARCHIVE       (deprecated anyway)
258  *    HIDDEN        (unlikely to be supported any time soon)
259  *    MIMETYPE      (unlikely to be supported any time soon)
260  *    QUOTA_*       (will be supported in a forthcoming patch)
261  *    SYSTEM        (unlikely to be supported any time soon)
262  *    TIME_BACKUP   (unlikely to be supported any time soon)
263  *    TIME_CREATE   (unlikely to be supported any time soon)
264  */
265 #define NFSD4_SUPPORTED_ATTRS_WORD0                                                         \
266 (FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
267  | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
268  | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
269  | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
270  | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
271  | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
272  | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
273  | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS      \
274  | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
275  | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE     | FATTR4_WORD0_ACL)
276
277 #define NFSD4_SUPPORTED_ATTRS_WORD1                                                         \
278 (FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
279  | FATTR4_WORD1_OWNER           | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
280  | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
281  | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
282  | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
283  | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
284
285 #define NFSD4_SUPPORTED_ATTRS_WORD2 0
286
287 #define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
288         NFSD4_SUPPORTED_ATTRS_WORD0
289
290 #define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
291         NFSD4_SUPPORTED_ATTRS_WORD1
292
293 #define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
294         (NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
295
296 static inline u32 nfsd_suppattrs0(u32 minorversion)
297 {
298         return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
299                             : NFSD4_SUPPORTED_ATTRS_WORD0;
300 }
301
302 static inline u32 nfsd_suppattrs1(u32 minorversion)
303 {
304         return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
305                             : NFSD4_SUPPORTED_ATTRS_WORD1;
306 }
307
308 static inline u32 nfsd_suppattrs2(u32 minorversion)
309 {
310         return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD2
311                             : NFSD4_SUPPORTED_ATTRS_WORD2;
312 }
313
314 /* These will return ERR_INVAL if specified in GETATTR or READDIR. */
315 #define NFSD_WRITEONLY_ATTRS_WORD1                                                          \
316 (FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)
317
318 /* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
319 #define NFSD_WRITEABLE_ATTRS_WORD0                                                          \
320 (FATTR4_WORD0_SIZE              | FATTR4_WORD0_ACL                                         )
321 #define NFSD_WRITEABLE_ATTRS_WORD1                                                          \
322 (FATTR4_WORD1_MODE              | FATTR4_WORD1_OWNER         | FATTR4_WORD1_OWNER_GROUP     \
323  | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
324 #define NFSD_WRITEABLE_ATTRS_WORD2 0
325
326 #define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
327         NFSD_WRITEABLE_ATTRS_WORD0
328 /*
329  * we currently store the exclusive create verifier in the v_{a,m}time
330  * attributes so the client can't set these at create time using EXCLUSIVE4_1
331  */
332 #define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
333         (NFSD_WRITEABLE_ATTRS_WORD1 & \
334          ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
335 #define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
336         NFSD_WRITEABLE_ATTRS_WORD2
337
338 #endif /* CONFIG_NFSD_V4 */
339
340 #endif /* LINUX_NFSD_NFSD_H */