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