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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#ifdef NFS_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 */
49enum {
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 */
61enum {
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
70static const struct rpc_program mnt_program;
71
72/*
73 * Defined by OpenGroup XNFS Version 3W, chapter 8
74 */
75enum mountstat {
76 MNT_OK = 0,
77 MNT_EPERM = 1,
78 MNT_ENOENT = 2,
79 MNT_EACCES = 13,
80 MNT_EINVAL = 22,
81};
82
83static 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 */
97enum 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
110static 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
126struct mountres {
127 int errno;
128 struct nfs_fh *fh;
129 unsigned int *auth_count;
130 rpc_authflavor_t *auth_flavors;
131};
132
133struct 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 */
144int 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 = info->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
195out:
196 return status;
197
198out_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
203out_call_err:
204 dprintk("NFS: MNT request failed, status=%d\n", status);
205 goto out;
206
207out_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 */
220void 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 = info->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
268out_clnt_err:
269 dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
270 PTR_ERR(clnt));
271 return;
272
273out_call_err:
274 dprintk("NFS: UMNT request failed, status=%d\n", status);
275}
276
277/*
278 * XDR encode/decode functions for MOUNT
279 */
280
281static 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
291static 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 */
306static 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
329static 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
343static 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
355static 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
378static 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
401static 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
435static 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
452static 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
471static 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
491static const struct rpc_version mnt_version1 = {
492 .number = 1,
493 .nrprocs = ARRAY_SIZE(mnt_procedures),
494 .procs = mnt_procedures,
495};
496
497static const struct rpc_version mnt_version3 = {
498 .number = 3,
499 .nrprocs = ARRAY_SIZE(mnt3_procedures),
500 .procs = mnt3_procedures,
501};
502
503static const struct rpc_version *mnt_version[] = {
504 NULL,
505 &mnt_version1,
506 NULL,
507 &mnt_version3,
508};
509
510static struct rpc_stat mnt_stats;
511
512static const 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};