]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * In-kernel MOUNT protocol client | |
3 | * | |
4 | * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de> | |
5 | */ | |
6 | ||
7 | #include <linux/types.h> | |
8 | #include <linux/socket.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/uio.h> | |
12 | #include <linux/net.h> | |
13 | #include <linux/in.h> | |
14 | #include <linux/sunrpc/clnt.h> | |
15 | #include <linux/sunrpc/sched.h> | |
16 | #include <linux/nfs_fs.h> | |
17 | #include "internal.h" | |
18 | ||
19 | #define NFSDBG_FACILITY NFSDBG_MOUNT | |
20 | ||
21 | /* | |
22 | * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4 | |
23 | */ | |
24 | #define MNTPATHLEN (1024) | |
25 | ||
26 | /* | |
27 | * XDR data type sizes | |
28 | */ | |
29 | #define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN)) | |
30 | #define MNT_status_sz (1) | |
31 | #define MNT_fhs_status_sz (1) | |
32 | #define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE) | |
33 | #define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE)) | |
34 | #define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS) | |
35 | ||
36 | /* | |
37 | * XDR argument and result sizes | |
38 | */ | |
39 | #define MNT_enc_dirpath_sz encode_dirpath_sz | |
40 | #define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz) | |
41 | #define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandle_sz + \ | |
42 | MNT_authflav3_sz) | |
43 | ||
44 | /* | |
45 | * Defined by RFC 1094, section A.5 | |
46 | */ | |
47 | enum { | |
48 | MOUNTPROC_NULL = 0, | |
49 | MOUNTPROC_MNT = 1, | |
50 | MOUNTPROC_DUMP = 2, | |
51 | MOUNTPROC_UMNT = 3, | |
52 | MOUNTPROC_UMNTALL = 4, | |
53 | MOUNTPROC_EXPORT = 5, | |
54 | }; | |
55 | ||
56 | /* | |
57 | * Defined by RFC 1813, section 5.2 | |
58 | */ | |
59 | enum { | |
60 | MOUNTPROC3_NULL = 0, | |
61 | MOUNTPROC3_MNT = 1, | |
62 | MOUNTPROC3_DUMP = 2, | |
63 | MOUNTPROC3_UMNT = 3, | |
64 | MOUNTPROC3_UMNTALL = 4, | |
65 | MOUNTPROC3_EXPORT = 5, | |
66 | }; | |
67 | ||
68 | static const struct rpc_program mnt_program; | |
69 | ||
70 | /* | |
71 | * Defined by OpenGroup XNFS Version 3W, chapter 8 | |
72 | */ | |
73 | enum mountstat { | |
74 | MNT_OK = 0, | |
75 | MNT_EPERM = 1, | |
76 | MNT_ENOENT = 2, | |
77 | MNT_EACCES = 13, | |
78 | MNT_EINVAL = 22, | |
79 | }; | |
80 | ||
81 | static struct { | |
82 | u32 status; | |
83 | int errno; | |
84 | } mnt_errtbl[] = { | |
85 | { .status = MNT_OK, .errno = 0, }, | |
86 | { .status = MNT_EPERM, .errno = -EPERM, }, | |
87 | { .status = MNT_ENOENT, .errno = -ENOENT, }, | |
88 | { .status = MNT_EACCES, .errno = -EACCES, }, | |
89 | { .status = MNT_EINVAL, .errno = -EINVAL, }, | |
90 | }; | |
91 | ||
92 | /* | |
93 | * Defined by RFC 1813, section 5.1.5 | |
94 | */ | |
95 | enum mountstat3 { | |
96 | MNT3_OK = 0, /* no error */ | |
97 | MNT3ERR_PERM = 1, /* Not owner */ | |
98 | MNT3ERR_NOENT = 2, /* No such file or directory */ | |
99 | MNT3ERR_IO = 5, /* I/O error */ | |
100 | MNT3ERR_ACCES = 13, /* Permission denied */ | |
101 | MNT3ERR_NOTDIR = 20, /* Not a directory */ | |
102 | MNT3ERR_INVAL = 22, /* Invalid argument */ | |
103 | MNT3ERR_NAMETOOLONG = 63, /* Filename too long */ | |
104 | MNT3ERR_NOTSUPP = 10004, /* Operation not supported */ | |
105 | MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */ | |
106 | }; | |
107 | ||
108 | static struct { | |
109 | u32 status; | |
110 | int errno; | |
111 | } mnt3_errtbl[] = { | |
112 | { .status = MNT3_OK, .errno = 0, }, | |
113 | { .status = MNT3ERR_PERM, .errno = -EPERM, }, | |
114 | { .status = MNT3ERR_NOENT, .errno = -ENOENT, }, | |
115 | { .status = MNT3ERR_IO, .errno = -EIO, }, | |
116 | { .status = MNT3ERR_ACCES, .errno = -EACCES, }, | |
117 | { .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, }, | |
118 | { .status = MNT3ERR_INVAL, .errno = -EINVAL, }, | |
119 | { .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, }, | |
120 | { .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, }, | |
121 | { .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, }, | |
122 | }; | |
123 | ||
124 | struct mountres { | |
125 | int errno; | |
126 | struct nfs_fh *fh; | |
127 | unsigned int *auth_count; | |
128 | rpc_authflavor_t *auth_flavors; | |
129 | }; | |
130 | ||
131 | struct mnt_fhstatus { | |
132 | u32 status; | |
133 | struct nfs_fh *fh; | |
134 | }; | |
135 | ||
136 | /** | |
137 | * nfs_mount - Obtain an NFS file handle for the given host and path | |
138 | * @info: pointer to mount request arguments | |
139 | * | |
140 | * Uses default timeout parameters specified by underlying transport. On | |
141 | * successful return, the auth_flavs list and auth_flav_len will be populated | |
142 | * with the list from the server or a faked-up list if the server didn't | |
143 | * provide one. | |
144 | */ | |
145 | int nfs_mount(struct nfs_mount_request *info) | |
146 | { | |
147 | struct mountres result = { | |
148 | .fh = info->fh, | |
149 | .auth_count = info->auth_flav_len, | |
150 | .auth_flavors = info->auth_flavs, | |
151 | }; | |
152 | struct rpc_message msg = { | |
153 | .rpc_argp = info->dirpath, | |
154 | .rpc_resp = &result, | |
155 | }; | |
156 | struct rpc_create_args args = { | |
157 | .net = info->net, | |
158 | .protocol = info->protocol, | |
159 | .address = info->sap, | |
160 | .addrsize = info->salen, | |
161 | .servername = info->hostname, | |
162 | .program = &mnt_program, | |
163 | .version = info->version, | |
164 | .authflavor = RPC_AUTH_UNIX, | |
165 | }; | |
166 | struct rpc_clnt *mnt_clnt; | |
167 | int status; | |
168 | ||
169 | dprintk("NFS: sending MNT request for %s:%s\n", | |
170 | (info->hostname ? info->hostname : "server"), | |
171 | info->dirpath); | |
172 | ||
173 | if (strlen(info->dirpath) > MNTPATHLEN) | |
174 | return -ENAMETOOLONG; | |
175 | ||
176 | if (info->noresvport) | |
177 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; | |
178 | ||
179 | mnt_clnt = rpc_create(&args); | |
180 | if (IS_ERR(mnt_clnt)) | |
181 | goto out_clnt_err; | |
182 | ||
183 | if (info->version == NFS_MNT3_VERSION) | |
184 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; | |
185 | else | |
186 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT]; | |
187 | ||
188 | status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT); | |
189 | rpc_shutdown_client(mnt_clnt); | |
190 | ||
191 | if (status < 0) | |
192 | goto out_call_err; | |
193 | if (result.errno != 0) | |
194 | goto out_mnt_err; | |
195 | ||
196 | dprintk("NFS: MNT request succeeded\n"); | |
197 | status = 0; | |
198 | ||
199 | /* | |
200 | * If the server didn't provide a flavor list, allow the | |
201 | * client to try any flavor. | |
202 | */ | |
203 | if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) { | |
204 | dprintk("NFS: Faking up auth_flavs list\n"); | |
205 | info->auth_flavs[0] = RPC_AUTH_NULL; | |
206 | *info->auth_flav_len = 1; | |
207 | } | |
208 | out: | |
209 | return status; | |
210 | ||
211 | out_clnt_err: | |
212 | status = PTR_ERR(mnt_clnt); | |
213 | dprintk("NFS: failed to create MNT RPC client, status=%d\n", status); | |
214 | goto out; | |
215 | ||
216 | out_call_err: | |
217 | dprintk("NFS: MNT request failed, status=%d\n", status); | |
218 | goto out; | |
219 | ||
220 | out_mnt_err: | |
221 | dprintk("NFS: MNT server returned result %d\n", result.errno); | |
222 | status = result.errno; | |
223 | goto out; | |
224 | } | |
225 | ||
226 | /** | |
227 | * nfs_umount - Notify a server that we have unmounted this export | |
228 | * @info: pointer to umount request arguments | |
229 | * | |
230 | * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always | |
231 | * use UDP. | |
232 | */ | |
233 | void nfs_umount(const struct nfs_mount_request *info) | |
234 | { | |
235 | static const struct rpc_timeout nfs_umnt_timeout = { | |
236 | .to_initval = 1 * HZ, | |
237 | .to_maxval = 3 * HZ, | |
238 | .to_retries = 2, | |
239 | }; | |
240 | struct rpc_create_args args = { | |
241 | .net = info->net, | |
242 | .protocol = IPPROTO_UDP, | |
243 | .address = info->sap, | |
244 | .addrsize = info->salen, | |
245 | .timeout = &nfs_umnt_timeout, | |
246 | .servername = info->hostname, | |
247 | .program = &mnt_program, | |
248 | .version = info->version, | |
249 | .authflavor = RPC_AUTH_UNIX, | |
250 | .flags = RPC_CLNT_CREATE_NOPING, | |
251 | }; | |
252 | struct rpc_message msg = { | |
253 | .rpc_argp = info->dirpath, | |
254 | }; | |
255 | struct rpc_clnt *clnt; | |
256 | int status; | |
257 | ||
258 | if (strlen(info->dirpath) > MNTPATHLEN) | |
259 | return; | |
260 | ||
261 | if (info->noresvport) | |
262 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; | |
263 | ||
264 | clnt = rpc_create(&args); | |
265 | if (IS_ERR(clnt)) | |
266 | goto out_clnt_err; | |
267 | ||
268 | dprintk("NFS: sending UMNT request for %s:%s\n", | |
269 | (info->hostname ? info->hostname : "server"), info->dirpath); | |
270 | ||
271 | if (info->version == NFS_MNT3_VERSION) | |
272 | msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT]; | |
273 | else | |
274 | msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT]; | |
275 | ||
276 | status = rpc_call_sync(clnt, &msg, 0); | |
277 | rpc_shutdown_client(clnt); | |
278 | ||
279 | if (unlikely(status < 0)) | |
280 | goto out_call_err; | |
281 | ||
282 | return; | |
283 | ||
284 | out_clnt_err: | |
285 | dprintk("NFS: failed to create UMNT RPC client, status=%ld\n", | |
286 | PTR_ERR(clnt)); | |
287 | return; | |
288 | ||
289 | out_call_err: | |
290 | dprintk("NFS: UMNT request failed, status=%d\n", status); | |
291 | } | |
292 | ||
293 | /* | |
294 | * XDR encode/decode functions for MOUNT | |
295 | */ | |
296 | ||
297 | static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname) | |
298 | { | |
299 | const u32 pathname_len = strlen(pathname); | |
300 | __be32 *p; | |
301 | ||
302 | p = xdr_reserve_space(xdr, 4 + pathname_len); | |
303 | xdr_encode_opaque(p, pathname, pathname_len); | |
304 | } | |
305 | ||
306 | static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr, | |
307 | const void *dirpath) | |
308 | { | |
309 | encode_mntdirpath(xdr, dirpath); | |
310 | } | |
311 | ||
312 | /* | |
313 | * RFC 1094: "A non-zero status indicates some sort of error. In this | |
314 | * case, the status is a UNIX error number." This can be problematic | |
315 | * if the server and client use different errno values for the same | |
316 | * error. | |
317 | * | |
318 | * However, the OpenGroup XNFS spec provides a simple mapping that is | |
319 | * independent of local errno values on the server and the client. | |
320 | */ | |
321 | static int decode_status(struct xdr_stream *xdr, struct mountres *res) | |
322 | { | |
323 | unsigned int i; | |
324 | u32 status; | |
325 | __be32 *p; | |
326 | ||
327 | p = xdr_inline_decode(xdr, 4); | |
328 | if (unlikely(p == NULL)) | |
329 | return -EIO; | |
330 | status = be32_to_cpup(p); | |
331 | ||
332 | for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) { | |
333 | if (mnt_errtbl[i].status == status) { | |
334 | res->errno = mnt_errtbl[i].errno; | |
335 | return 0; | |
336 | } | |
337 | } | |
338 | ||
339 | dprintk("NFS: unrecognized MNT status code: %u\n", status); | |
340 | res->errno = -EACCES; | |
341 | return 0; | |
342 | } | |
343 | ||
344 | static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res) | |
345 | { | |
346 | struct nfs_fh *fh = res->fh; | |
347 | __be32 *p; | |
348 | ||
349 | p = xdr_inline_decode(xdr, NFS2_FHSIZE); | |
350 | if (unlikely(p == NULL)) | |
351 | return -EIO; | |
352 | ||
353 | fh->size = NFS2_FHSIZE; | |
354 | memcpy(fh->data, p, NFS2_FHSIZE); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static int mnt_xdr_dec_mountres(struct rpc_rqst *req, | |
359 | struct xdr_stream *xdr, | |
360 | struct mountres *res) | |
361 | { | |
362 | int status; | |
363 | ||
364 | status = decode_status(xdr, res); | |
365 | if (unlikely(status != 0 || res->errno != 0)) | |
366 | return status; | |
367 | return decode_fhandle(xdr, res); | |
368 | } | |
369 | ||
370 | static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res) | |
371 | { | |
372 | unsigned int i; | |
373 | u32 status; | |
374 | __be32 *p; | |
375 | ||
376 | p = xdr_inline_decode(xdr, 4); | |
377 | if (unlikely(p == NULL)) | |
378 | return -EIO; | |
379 | status = be32_to_cpup(p); | |
380 | ||
381 | for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) { | |
382 | if (mnt3_errtbl[i].status == status) { | |
383 | res->errno = mnt3_errtbl[i].errno; | |
384 | return 0; | |
385 | } | |
386 | } | |
387 | ||
388 | dprintk("NFS: unrecognized MNT3 status code: %u\n", status); | |
389 | res->errno = -EACCES; | |
390 | return 0; | |
391 | } | |
392 | ||
393 | static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res) | |
394 | { | |
395 | struct nfs_fh *fh = res->fh; | |
396 | u32 size; | |
397 | __be32 *p; | |
398 | ||
399 | p = xdr_inline_decode(xdr, 4); | |
400 | if (unlikely(p == NULL)) | |
401 | return -EIO; | |
402 | ||
403 | size = be32_to_cpup(p); | |
404 | if (size > NFS3_FHSIZE || size == 0) | |
405 | return -EIO; | |
406 | ||
407 | p = xdr_inline_decode(xdr, size); | |
408 | if (unlikely(p == NULL)) | |
409 | return -EIO; | |
410 | ||
411 | fh->size = size; | |
412 | memcpy(fh->data, p, size); | |
413 | return 0; | |
414 | } | |
415 | ||
416 | static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res) | |
417 | { | |
418 | rpc_authflavor_t *flavors = res->auth_flavors; | |
419 | unsigned int *count = res->auth_count; | |
420 | u32 entries, i; | |
421 | __be32 *p; | |
422 | ||
423 | if (*count == 0) | |
424 | return 0; | |
425 | ||
426 | p = xdr_inline_decode(xdr, 4); | |
427 | if (unlikely(p == NULL)) | |
428 | return -EIO; | |
429 | entries = be32_to_cpup(p); | |
430 | dprintk("NFS: received %u auth flavors\n", entries); | |
431 | if (entries > NFS_MAX_SECFLAVORS) | |
432 | entries = NFS_MAX_SECFLAVORS; | |
433 | ||
434 | p = xdr_inline_decode(xdr, 4 * entries); | |
435 | if (unlikely(p == NULL)) | |
436 | return -EIO; | |
437 | ||
438 | if (entries > *count) | |
439 | entries = *count; | |
440 | ||
441 | for (i = 0; i < entries; i++) { | |
442 | flavors[i] = be32_to_cpup(p++); | |
443 | dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]); | |
444 | } | |
445 | *count = i; | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | static int mnt_xdr_dec_mountres3(struct rpc_rqst *req, | |
451 | struct xdr_stream *xdr, | |
452 | struct mountres *res) | |
453 | { | |
454 | int status; | |
455 | ||
456 | status = decode_fhs_status(xdr, res); | |
457 | if (unlikely(status != 0 || res->errno != 0)) | |
458 | return status; | |
459 | status = decode_fhandle3(xdr, res); | |
460 | if (unlikely(status != 0)) { | |
461 | res->errno = -EBADHANDLE; | |
462 | return 0; | |
463 | } | |
464 | return decode_auth_flavors(xdr, res); | |
465 | } | |
466 | ||
467 | static struct rpc_procinfo mnt_procedures[] = { | |
468 | [MOUNTPROC_MNT] = { | |
469 | .p_proc = MOUNTPROC_MNT, | |
470 | .p_encode = mnt_xdr_enc_dirpath, | |
471 | .p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres, | |
472 | .p_arglen = MNT_enc_dirpath_sz, | |
473 | .p_replen = MNT_dec_mountres_sz, | |
474 | .p_statidx = MOUNTPROC_MNT, | |
475 | .p_name = "MOUNT", | |
476 | }, | |
477 | [MOUNTPROC_UMNT] = { | |
478 | .p_proc = MOUNTPROC_UMNT, | |
479 | .p_encode = mnt_xdr_enc_dirpath, | |
480 | .p_arglen = MNT_enc_dirpath_sz, | |
481 | .p_statidx = MOUNTPROC_UMNT, | |
482 | .p_name = "UMOUNT", | |
483 | }, | |
484 | }; | |
485 | ||
486 | static struct rpc_procinfo mnt3_procedures[] = { | |
487 | [MOUNTPROC3_MNT] = { | |
488 | .p_proc = MOUNTPROC3_MNT, | |
489 | .p_encode = mnt_xdr_enc_dirpath, | |
490 | .p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres3, | |
491 | .p_arglen = MNT_enc_dirpath_sz, | |
492 | .p_replen = MNT_dec_mountres3_sz, | |
493 | .p_statidx = MOUNTPROC3_MNT, | |
494 | .p_name = "MOUNT", | |
495 | }, | |
496 | [MOUNTPROC3_UMNT] = { | |
497 | .p_proc = MOUNTPROC3_UMNT, | |
498 | .p_encode = mnt_xdr_enc_dirpath, | |
499 | .p_arglen = MNT_enc_dirpath_sz, | |
500 | .p_statidx = MOUNTPROC3_UMNT, | |
501 | .p_name = "UMOUNT", | |
502 | }, | |
503 | }; | |
504 | ||
505 | ||
506 | static const struct rpc_version mnt_version1 = { | |
507 | .number = 1, | |
508 | .nrprocs = ARRAY_SIZE(mnt_procedures), | |
509 | .procs = mnt_procedures, | |
510 | }; | |
511 | ||
512 | static const struct rpc_version mnt_version3 = { | |
513 | .number = 3, | |
514 | .nrprocs = ARRAY_SIZE(mnt3_procedures), | |
515 | .procs = mnt3_procedures, | |
516 | }; | |
517 | ||
518 | static const struct rpc_version *mnt_version[] = { | |
519 | NULL, | |
520 | &mnt_version1, | |
521 | NULL, | |
522 | &mnt_version3, | |
523 | }; | |
524 | ||
525 | static struct rpc_stat mnt_stats; | |
526 | ||
527 | static const struct rpc_program mnt_program = { | |
528 | .name = "mount", | |
529 | .number = NFS_MNT_PROGRAM, | |
530 | .nrvers = ARRAY_SIZE(mnt_version), | |
531 | .version = mnt_version, | |
532 | .stats = &mnt_stats, | |
533 | }; |