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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * In-kernel MOUNT protocol client
4 *
5 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
6 */
7
8#include <linux/types.h>
9#include <linux/socket.h>
10#include <linux/kernel.h>
11#include <linux/errno.h>
12#include <linux/uio.h>
13#include <linux/net.h>
14#include <linux/in.h>
15#include <linux/sunrpc/clnt.h>
16#include <linux/sunrpc/sched.h>
17#include <linux/nfs_fs.h>
18#include "internal.h"
19
20#define NFSDBG_FACILITY NFSDBG_MOUNT
21
22/*
23 * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
24 */
25#define MNTPATHLEN (1024)
26
27/*
28 * XDR data type sizes
29 */
30#define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN))
31#define MNT_status_sz (1)
32#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE)
33#define MNT_fhandlev3_sz 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_fhandlev3_sz + \
42 MNT_authflav3_sz)
43
44/*
45 * Defined by RFC 1094, section A.5
46 */
47enum {
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 */
59enum {
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
68static const struct rpc_program mnt_program;
69
70/*
71 * Defined by OpenGroup XNFS Version 3W, chapter 8
72 */
73enum mountstat {
74 MNT_OK = 0,
75 MNT_EPERM = 1,
76 MNT_ENOENT = 2,
77 MNT_EACCES = 13,
78 MNT_EINVAL = 22,
79};
80
81static 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 */
95enum 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
108static 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
124struct mountres {
125 int errno;
126 struct nfs_fh *fh;
127 unsigned int *auth_count;
128 rpc_authflavor_t *auth_flavors;
129};
130
131struct 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 * @timeo: deciseconds the mount waits for a response before it retries
140 * @retrans: number of times the mount retries a request
141 *
142 * Uses timeout parameters specified by caller. On successful return, the
143 * auth_flavs list and auth_flav_len will be populated with the list from the
144 * server or a faked-up list if the server didn't provide one.
145 */
146int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans)
147{
148 struct rpc_timeout mnt_timeout;
149 struct mountres result = {
150 .fh = info->fh,
151 .auth_count = info->auth_flav_len,
152 .auth_flavors = info->auth_flavs,
153 };
154 struct rpc_message msg = {
155 .rpc_argp = info->dirpath,
156 .rpc_resp = &result,
157 };
158 struct rpc_create_args args = {
159 .net = info->net,
160 .protocol = info->protocol,
161 .address = (struct sockaddr *)info->sap,
162 .addrsize = info->salen,
163 .timeout = &mnt_timeout,
164 .servername = info->hostname,
165 .program = &mnt_program,
166 .version = info->version,
167 .authflavor = RPC_AUTH_UNIX,
168 .cred = current_cred(),
169 };
170 struct rpc_clnt *mnt_clnt;
171 int status;
172
173 dprintk("NFS: sending MNT request for %s:%s\n",
174 (info->hostname ? info->hostname : "server"),
175 info->dirpath);
176
177 if (strlen(info->dirpath) > MNTPATHLEN)
178 return -ENAMETOOLONG;
179
180 if (info->noresvport)
181 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
182
183 nfs_init_timeout_values(&mnt_timeout, info->protocol, timeo, retrans);
184 mnt_clnt = rpc_create(&args);
185 if (IS_ERR(mnt_clnt))
186 goto out_clnt_err;
187
188 if (info->version == NFS_MNT3_VERSION)
189 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
190 else
191 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
192
193 status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT);
194 rpc_shutdown_client(mnt_clnt);
195
196 if (status < 0)
197 goto out_call_err;
198 if (result.errno != 0)
199 goto out_mnt_err;
200
201 dprintk("NFS: MNT request succeeded\n");
202 status = 0;
203
204 /*
205 * If the server didn't provide a flavor list, allow the
206 * client to try any flavor.
207 */
208 if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) {
209 dprintk("NFS: Faking up auth_flavs list\n");
210 info->auth_flavs[0] = RPC_AUTH_NULL;
211 *info->auth_flav_len = 1;
212 }
213out:
214 return status;
215
216out_clnt_err:
217 status = PTR_ERR(mnt_clnt);
218 dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
219 goto out;
220
221out_call_err:
222 dprintk("NFS: MNT request failed, status=%d\n", status);
223 goto out;
224
225out_mnt_err:
226 dprintk("NFS: MNT server returned result %d\n", result.errno);
227 status = result.errno;
228 goto out;
229}
230
231/**
232 * nfs_umount - Notify a server that we have unmounted this export
233 * @info: pointer to umount request arguments
234 *
235 * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
236 * use UDP.
237 */
238void nfs_umount(const struct nfs_mount_request *info)
239{
240 static const struct rpc_timeout nfs_umnt_timeout = {
241 .to_initval = 1 * HZ,
242 .to_maxval = 3 * HZ,
243 .to_retries = 2,
244 };
245 struct rpc_create_args args = {
246 .net = info->net,
247 .protocol = IPPROTO_UDP,
248 .address = (struct sockaddr *)info->sap,
249 .addrsize = info->salen,
250 .timeout = &nfs_umnt_timeout,
251 .servername = info->hostname,
252 .program = &mnt_program,
253 .version = info->version,
254 .authflavor = RPC_AUTH_UNIX,
255 .flags = RPC_CLNT_CREATE_NOPING,
256 .cred = current_cred(),
257 };
258 struct rpc_message msg = {
259 .rpc_argp = info->dirpath,
260 };
261 struct rpc_clnt *clnt;
262 int status;
263
264 if (strlen(info->dirpath) > MNTPATHLEN)
265 return;
266
267 if (info->noresvport)
268 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
269
270 clnt = rpc_create(&args);
271 if (IS_ERR(clnt))
272 goto out_clnt_err;
273
274 dprintk("NFS: sending UMNT request for %s:%s\n",
275 (info->hostname ? info->hostname : "server"), info->dirpath);
276
277 if (info->version == NFS_MNT3_VERSION)
278 msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
279 else
280 msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];
281
282 status = rpc_call_sync(clnt, &msg, 0);
283 rpc_shutdown_client(clnt);
284
285 if (unlikely(status < 0))
286 goto out_call_err;
287
288 return;
289
290out_clnt_err:
291 dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
292 PTR_ERR(clnt));
293 return;
294
295out_call_err:
296 dprintk("NFS: UMNT request failed, status=%d\n", status);
297}
298
299/*
300 * XDR encode/decode functions for MOUNT
301 */
302
303static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
304{
305 const u32 pathname_len = strlen(pathname);
306 __be32 *p;
307
308 p = xdr_reserve_space(xdr, 4 + pathname_len);
309 xdr_encode_opaque(p, pathname, pathname_len);
310}
311
312static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr,
313 const void *dirpath)
314{
315 encode_mntdirpath(xdr, dirpath);
316}
317
318/*
319 * RFC 1094: "A non-zero status indicates some sort of error. In this
320 * case, the status is a UNIX error number." This can be problematic
321 * if the server and client use different errno values for the same
322 * error.
323 *
324 * However, the OpenGroup XNFS spec provides a simple mapping that is
325 * independent of local errno values on the server and the client.
326 */
327static int decode_status(struct xdr_stream *xdr, struct mountres *res)
328{
329 unsigned int i;
330 u32 status;
331 __be32 *p;
332
333 p = xdr_inline_decode(xdr, 4);
334 if (unlikely(p == NULL))
335 return -EIO;
336 status = be32_to_cpup(p);
337
338 for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
339 if (mnt_errtbl[i].status == status) {
340 res->errno = mnt_errtbl[i].errno;
341 return 0;
342 }
343 }
344
345 dprintk("NFS: unrecognized MNT status code: %u\n", status);
346 res->errno = -EACCES;
347 return 0;
348}
349
350static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res)
351{
352 struct nfs_fh *fh = res->fh;
353 __be32 *p;
354
355 p = xdr_inline_decode(xdr, NFS2_FHSIZE);
356 if (unlikely(p == NULL))
357 return -EIO;
358
359 fh->size = NFS2_FHSIZE;
360 memcpy(fh->data, p, NFS2_FHSIZE);
361 return 0;
362}
363
364static int mnt_xdr_dec_mountres(struct rpc_rqst *req,
365 struct xdr_stream *xdr,
366 void *data)
367{
368 struct mountres *res = data;
369 int status;
370
371 status = decode_status(xdr, res);
372 if (unlikely(status != 0 || res->errno != 0))
373 return status;
374 return decode_fhandle(xdr, res);
375}
376
377static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
378{
379 unsigned int i;
380 u32 status;
381 __be32 *p;
382
383 p = xdr_inline_decode(xdr, 4);
384 if (unlikely(p == NULL))
385 return -EIO;
386 status = be32_to_cpup(p);
387
388 for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
389 if (mnt3_errtbl[i].status == status) {
390 res->errno = mnt3_errtbl[i].errno;
391 return 0;
392 }
393 }
394
395 dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
396 res->errno = -EACCES;
397 return 0;
398}
399
400static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
401{
402 struct nfs_fh *fh = res->fh;
403 u32 size;
404 __be32 *p;
405
406 p = xdr_inline_decode(xdr, 4);
407 if (unlikely(p == NULL))
408 return -EIO;
409
410 size = be32_to_cpup(p);
411 if (size > NFS3_FHSIZE || size == 0)
412 return -EIO;
413
414 p = xdr_inline_decode(xdr, size);
415 if (unlikely(p == NULL))
416 return -EIO;
417
418 fh->size = size;
419 memcpy(fh->data, p, size);
420 return 0;
421}
422
423static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
424{
425 rpc_authflavor_t *flavors = res->auth_flavors;
426 unsigned int *count = res->auth_count;
427 u32 entries, i;
428 __be32 *p;
429
430 if (*count == 0)
431 return 0;
432
433 p = xdr_inline_decode(xdr, 4);
434 if (unlikely(p == NULL))
435 return -EIO;
436 entries = be32_to_cpup(p);
437 dprintk("NFS: received %u auth flavors\n", entries);
438 if (entries > NFS_MAX_SECFLAVORS)
439 entries = NFS_MAX_SECFLAVORS;
440
441 p = xdr_inline_decode(xdr, 4 * entries);
442 if (unlikely(p == NULL))
443 return -EIO;
444
445 if (entries > *count)
446 entries = *count;
447
448 for (i = 0; i < entries; i++) {
449 flavors[i] = be32_to_cpup(p++);
450 dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
451 }
452 *count = i;
453
454 return 0;
455}
456
457static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
458 struct xdr_stream *xdr,
459 void *data)
460{
461 struct mountres *res = data;
462 int status;
463
464 status = decode_fhs_status(xdr, res);
465 if (unlikely(status != 0 || res->errno != 0))
466 return status;
467 status = decode_fhandle3(xdr, res);
468 if (unlikely(status != 0)) {
469 res->errno = -EBADHANDLE;
470 return 0;
471 }
472 return decode_auth_flavors(xdr, res);
473}
474
475static const struct rpc_procinfo mnt_procedures[] = {
476 [MOUNTPROC_MNT] = {
477 .p_proc = MOUNTPROC_MNT,
478 .p_encode = mnt_xdr_enc_dirpath,
479 .p_decode = mnt_xdr_dec_mountres,
480 .p_arglen = MNT_enc_dirpath_sz,
481 .p_replen = MNT_dec_mountres_sz,
482 .p_statidx = MOUNTPROC_MNT,
483 .p_name = "MOUNT",
484 },
485 [MOUNTPROC_UMNT] = {
486 .p_proc = MOUNTPROC_UMNT,
487 .p_encode = mnt_xdr_enc_dirpath,
488 .p_arglen = MNT_enc_dirpath_sz,
489 .p_statidx = MOUNTPROC_UMNT,
490 .p_name = "UMOUNT",
491 },
492};
493
494static const struct rpc_procinfo mnt3_procedures[] = {
495 [MOUNTPROC3_MNT] = {
496 .p_proc = MOUNTPROC3_MNT,
497 .p_encode = mnt_xdr_enc_dirpath,
498 .p_decode = mnt_xdr_dec_mountres3,
499 .p_arglen = MNT_enc_dirpath_sz,
500 .p_replen = MNT_dec_mountres3_sz,
501 .p_statidx = MOUNTPROC3_MNT,
502 .p_name = "MOUNT",
503 },
504 [MOUNTPROC3_UMNT] = {
505 .p_proc = MOUNTPROC3_UMNT,
506 .p_encode = mnt_xdr_enc_dirpath,
507 .p_arglen = MNT_enc_dirpath_sz,
508 .p_statidx = MOUNTPROC3_UMNT,
509 .p_name = "UMOUNT",
510 },
511};
512
513static unsigned int mnt_counts[ARRAY_SIZE(mnt_procedures)];
514static const struct rpc_version mnt_version1 = {
515 .number = 1,
516 .nrprocs = ARRAY_SIZE(mnt_procedures),
517 .procs = mnt_procedures,
518 .counts = mnt_counts,
519};
520
521static unsigned int mnt3_counts[ARRAY_SIZE(mnt3_procedures)];
522static const struct rpc_version mnt_version3 = {
523 .number = 3,
524 .nrprocs = ARRAY_SIZE(mnt3_procedures),
525 .procs = mnt3_procedures,
526 .counts = mnt3_counts,
527};
528
529static const struct rpc_version *mnt_version[] = {
530 NULL,
531 &mnt_version1,
532 NULL,
533 &mnt_version3,
534};
535
536static struct rpc_stat mnt_stats;
537
538static const struct rpc_program mnt_program = {
539 .name = "mount",
540 .number = NFS_MNT_PROGRAM,
541 .nrvers = ARRAY_SIZE(mnt_version),
542 .version = mnt_version,
543 .stats = &mnt_stats,
544};
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 */
47enum {
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 */
59enum {
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
68static const struct rpc_program mnt_program;
69
70/*
71 * Defined by OpenGroup XNFS Version 3W, chapter 8
72 */
73enum mountstat {
74 MNT_OK = 0,
75 MNT_EPERM = 1,
76 MNT_ENOENT = 2,
77 MNT_EACCES = 13,
78 MNT_EINVAL = 22,
79};
80
81static 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 */
95enum 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
108static 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
124struct mountres {
125 int errno;
126 struct nfs_fh *fh;
127 unsigned int *auth_count;
128 rpc_authflavor_t *auth_flavors;
129};
130
131struct 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 */
145int 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 }
208out:
209 return status;
210
211out_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
216out_call_err:
217 dprintk("NFS: MNT request failed, status=%d\n", status);
218 goto out;
219
220out_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 */
233void 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
284out_clnt_err:
285 dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
286 PTR_ERR(clnt));
287 return;
288
289out_call_err:
290 dprintk("NFS: UMNT request failed, status=%d\n", status);
291}
292
293/*
294 * XDR encode/decode functions for MOUNT
295 */
296
297static 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
306static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr,
307 const char *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 */
321static 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
344static 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
358static 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
370static 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
393static 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
416static 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
450static 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
467static struct rpc_procinfo mnt_procedures[] = {
468 [MOUNTPROC_MNT] = {
469 .p_proc = MOUNTPROC_MNT,
470 .p_encode = (kxdreproc_t)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 = (kxdreproc_t)mnt_xdr_enc_dirpath,
480 .p_arglen = MNT_enc_dirpath_sz,
481 .p_statidx = MOUNTPROC_UMNT,
482 .p_name = "UMOUNT",
483 },
484};
485
486static struct rpc_procinfo mnt3_procedures[] = {
487 [MOUNTPROC3_MNT] = {
488 .p_proc = MOUNTPROC3_MNT,
489 .p_encode = (kxdreproc_t)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 = (kxdreproc_t)mnt_xdr_enc_dirpath,
499 .p_arglen = MNT_enc_dirpath_sz,
500 .p_statidx = MOUNTPROC3_UMNT,
501 .p_name = "UMOUNT",
502 },
503};
504
505
506static const struct rpc_version mnt_version1 = {
507 .number = 1,
508 .nrprocs = ARRAY_SIZE(mnt_procedures),
509 .procs = mnt_procedures,
510};
511
512static const struct rpc_version mnt_version3 = {
513 .number = 3,
514 .nrprocs = ARRAY_SIZE(mnt3_procedures),
515 .procs = mnt3_procedures,
516};
517
518static const struct rpc_version *mnt_version[] = {
519 NULL,
520 &mnt_version1,
521 NULL,
522 &mnt_version3,
523};
524
525static struct rpc_stat mnt_stats;
526
527static 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};