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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_fhs_status_sz (1)
33#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE)
34#define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE))
35#define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS)
36
37/*
38 * XDR argument and result sizes
39 */
40#define MNT_enc_dirpath_sz encode_dirpath_sz
41#define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz)
42#define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandle_sz + \
43 MNT_authflav3_sz)
44
45/*
46 * Defined by RFC 1094, section A.5
47 */
48enum {
49 MOUNTPROC_NULL = 0,
50 MOUNTPROC_MNT = 1,
51 MOUNTPROC_DUMP = 2,
52 MOUNTPROC_UMNT = 3,
53 MOUNTPROC_UMNTALL = 4,
54 MOUNTPROC_EXPORT = 5,
55};
56
57/*
58 * Defined by RFC 1813, section 5.2
59 */
60enum {
61 MOUNTPROC3_NULL = 0,
62 MOUNTPROC3_MNT = 1,
63 MOUNTPROC3_DUMP = 2,
64 MOUNTPROC3_UMNT = 3,
65 MOUNTPROC3_UMNTALL = 4,
66 MOUNTPROC3_EXPORT = 5,
67};
68
69static const struct rpc_program mnt_program;
70
71/*
72 * Defined by OpenGroup XNFS Version 3W, chapter 8
73 */
74enum mountstat {
75 MNT_OK = 0,
76 MNT_EPERM = 1,
77 MNT_ENOENT = 2,
78 MNT_EACCES = 13,
79 MNT_EINVAL = 22,
80};
81
82static struct {
83 u32 status;
84 int errno;
85} mnt_errtbl[] = {
86 { .status = MNT_OK, .errno = 0, },
87 { .status = MNT_EPERM, .errno = -EPERM, },
88 { .status = MNT_ENOENT, .errno = -ENOENT, },
89 { .status = MNT_EACCES, .errno = -EACCES, },
90 { .status = MNT_EINVAL, .errno = -EINVAL, },
91};
92
93/*
94 * Defined by RFC 1813, section 5.1.5
95 */
96enum mountstat3 {
97 MNT3_OK = 0, /* no error */
98 MNT3ERR_PERM = 1, /* Not owner */
99 MNT3ERR_NOENT = 2, /* No such file or directory */
100 MNT3ERR_IO = 5, /* I/O error */
101 MNT3ERR_ACCES = 13, /* Permission denied */
102 MNT3ERR_NOTDIR = 20, /* Not a directory */
103 MNT3ERR_INVAL = 22, /* Invalid argument */
104 MNT3ERR_NAMETOOLONG = 63, /* Filename too long */
105 MNT3ERR_NOTSUPP = 10004, /* Operation not supported */
106 MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */
107};
108
109static struct {
110 u32 status;
111 int errno;
112} mnt3_errtbl[] = {
113 { .status = MNT3_OK, .errno = 0, },
114 { .status = MNT3ERR_PERM, .errno = -EPERM, },
115 { .status = MNT3ERR_NOENT, .errno = -ENOENT, },
116 { .status = MNT3ERR_IO, .errno = -EIO, },
117 { .status = MNT3ERR_ACCES, .errno = -EACCES, },
118 { .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, },
119 { .status = MNT3ERR_INVAL, .errno = -EINVAL, },
120 { .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, },
121 { .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, },
122 { .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, },
123};
124
125struct mountres {
126 int errno;
127 struct nfs_fh *fh;
128 unsigned int *auth_count;
129 rpc_authflavor_t *auth_flavors;
130};
131
132struct mnt_fhstatus {
133 u32 status;
134 struct nfs_fh *fh;
135};
136
137/**
138 * nfs_mount - Obtain an NFS file handle for the given host and path
139 * @info: pointer to mount request arguments
140 *
141 * Uses default timeout parameters specified by underlying transport. On
142 * successful return, the auth_flavs list and auth_flav_len will be populated
143 * with the list from the server or a faked-up list if the server didn't
144 * provide one.
145 */
146int nfs_mount(struct nfs_mount_request *info)
147{
148 struct mountres result = {
149 .fh = info->fh,
150 .auth_count = info->auth_flav_len,
151 .auth_flavors = info->auth_flavs,
152 };
153 struct rpc_message msg = {
154 .rpc_argp = info->dirpath,
155 .rpc_resp = &result,
156 };
157 struct rpc_create_args args = {
158 .net = info->net,
159 .protocol = info->protocol,
160 .address = info->sap,
161 .addrsize = info->salen,
162 .servername = info->hostname,
163 .program = &mnt_program,
164 .version = info->version,
165 .authflavor = RPC_AUTH_UNIX,
166 };
167 struct rpc_clnt *mnt_clnt;
168 int status;
169
170 dprintk("NFS: sending MNT request for %s:%s\n",
171 (info->hostname ? info->hostname : "server"),
172 info->dirpath);
173
174 if (strlen(info->dirpath) > MNTPATHLEN)
175 return -ENAMETOOLONG;
176
177 if (info->noresvport)
178 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
179
180 mnt_clnt = rpc_create(&args);
181 if (IS_ERR(mnt_clnt))
182 goto out_clnt_err;
183
184 if (info->version == NFS_MNT3_VERSION)
185 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
186 else
187 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
188
189 status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT);
190 rpc_shutdown_client(mnt_clnt);
191
192 if (status < 0)
193 goto out_call_err;
194 if (result.errno != 0)
195 goto out_mnt_err;
196
197 dprintk("NFS: MNT request succeeded\n");
198 status = 0;
199
200 /*
201 * If the server didn't provide a flavor list, allow the
202 * client to try any flavor.
203 */
204 if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) {
205 dprintk("NFS: Faking up auth_flavs list\n");
206 info->auth_flavs[0] = RPC_AUTH_NULL;
207 *info->auth_flav_len = 1;
208 }
209out:
210 return status;
211
212out_clnt_err:
213 status = PTR_ERR(mnt_clnt);
214 dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
215 goto out;
216
217out_call_err:
218 dprintk("NFS: MNT request failed, status=%d\n", status);
219 goto out;
220
221out_mnt_err:
222 dprintk("NFS: MNT server returned result %d\n", result.errno);
223 status = result.errno;
224 goto out;
225}
226
227/**
228 * nfs_umount - Notify a server that we have unmounted this export
229 * @info: pointer to umount request arguments
230 *
231 * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
232 * use UDP.
233 */
234void nfs_umount(const struct nfs_mount_request *info)
235{
236 static const struct rpc_timeout nfs_umnt_timeout = {
237 .to_initval = 1 * HZ,
238 .to_maxval = 3 * HZ,
239 .to_retries = 2,
240 };
241 struct rpc_create_args args = {
242 .net = info->net,
243 .protocol = IPPROTO_UDP,
244 .address = info->sap,
245 .addrsize = info->salen,
246 .timeout = &nfs_umnt_timeout,
247 .servername = info->hostname,
248 .program = &mnt_program,
249 .version = info->version,
250 .authflavor = RPC_AUTH_UNIX,
251 .flags = RPC_CLNT_CREATE_NOPING,
252 };
253 struct rpc_message msg = {
254 .rpc_argp = info->dirpath,
255 };
256 struct rpc_clnt *clnt;
257 int status;
258
259 if (strlen(info->dirpath) > MNTPATHLEN)
260 return;
261
262 if (info->noresvport)
263 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
264
265 clnt = rpc_create(&args);
266 if (IS_ERR(clnt))
267 goto out_clnt_err;
268
269 dprintk("NFS: sending UMNT request for %s:%s\n",
270 (info->hostname ? info->hostname : "server"), info->dirpath);
271
272 if (info->version == NFS_MNT3_VERSION)
273 msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
274 else
275 msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];
276
277 status = rpc_call_sync(clnt, &msg, 0);
278 rpc_shutdown_client(clnt);
279
280 if (unlikely(status < 0))
281 goto out_call_err;
282
283 return;
284
285out_clnt_err:
286 dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
287 PTR_ERR(clnt));
288 return;
289
290out_call_err:
291 dprintk("NFS: UMNT request failed, status=%d\n", status);
292}
293
294/*
295 * XDR encode/decode functions for MOUNT
296 */
297
298static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
299{
300 const u32 pathname_len = strlen(pathname);
301 __be32 *p;
302
303 p = xdr_reserve_space(xdr, 4 + pathname_len);
304 xdr_encode_opaque(p, pathname, pathname_len);
305}
306
307static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr,
308 const void *dirpath)
309{
310 encode_mntdirpath(xdr, dirpath);
311}
312
313/*
314 * RFC 1094: "A non-zero status indicates some sort of error. In this
315 * case, the status is a UNIX error number." This can be problematic
316 * if the server and client use different errno values for the same
317 * error.
318 *
319 * However, the OpenGroup XNFS spec provides a simple mapping that is
320 * independent of local errno values on the server and the client.
321 */
322static int decode_status(struct xdr_stream *xdr, struct mountres *res)
323{
324 unsigned int i;
325 u32 status;
326 __be32 *p;
327
328 p = xdr_inline_decode(xdr, 4);
329 if (unlikely(p == NULL))
330 return -EIO;
331 status = be32_to_cpup(p);
332
333 for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
334 if (mnt_errtbl[i].status == status) {
335 res->errno = mnt_errtbl[i].errno;
336 return 0;
337 }
338 }
339
340 dprintk("NFS: unrecognized MNT status code: %u\n", status);
341 res->errno = -EACCES;
342 return 0;
343}
344
345static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res)
346{
347 struct nfs_fh *fh = res->fh;
348 __be32 *p;
349
350 p = xdr_inline_decode(xdr, NFS2_FHSIZE);
351 if (unlikely(p == NULL))
352 return -EIO;
353
354 fh->size = NFS2_FHSIZE;
355 memcpy(fh->data, p, NFS2_FHSIZE);
356 return 0;
357}
358
359static int mnt_xdr_dec_mountres(struct rpc_rqst *req,
360 struct xdr_stream *xdr,
361 void *data)
362{
363 struct mountres *res = data;
364 int status;
365
366 status = decode_status(xdr, res);
367 if (unlikely(status != 0 || res->errno != 0))
368 return status;
369 return decode_fhandle(xdr, res);
370}
371
372static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
373{
374 unsigned int i;
375 u32 status;
376 __be32 *p;
377
378 p = xdr_inline_decode(xdr, 4);
379 if (unlikely(p == NULL))
380 return -EIO;
381 status = be32_to_cpup(p);
382
383 for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
384 if (mnt3_errtbl[i].status == status) {
385 res->errno = mnt3_errtbl[i].errno;
386 return 0;
387 }
388 }
389
390 dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
391 res->errno = -EACCES;
392 return 0;
393}
394
395static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
396{
397 struct nfs_fh *fh = res->fh;
398 u32 size;
399 __be32 *p;
400
401 p = xdr_inline_decode(xdr, 4);
402 if (unlikely(p == NULL))
403 return -EIO;
404
405 size = be32_to_cpup(p);
406 if (size > NFS3_FHSIZE || size == 0)
407 return -EIO;
408
409 p = xdr_inline_decode(xdr, size);
410 if (unlikely(p == NULL))
411 return -EIO;
412
413 fh->size = size;
414 memcpy(fh->data, p, size);
415 return 0;
416}
417
418static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
419{
420 rpc_authflavor_t *flavors = res->auth_flavors;
421 unsigned int *count = res->auth_count;
422 u32 entries, i;
423 __be32 *p;
424
425 if (*count == 0)
426 return 0;
427
428 p = xdr_inline_decode(xdr, 4);
429 if (unlikely(p == NULL))
430 return -EIO;
431 entries = be32_to_cpup(p);
432 dprintk("NFS: received %u auth flavors\n", entries);
433 if (entries > NFS_MAX_SECFLAVORS)
434 entries = NFS_MAX_SECFLAVORS;
435
436 p = xdr_inline_decode(xdr, 4 * entries);
437 if (unlikely(p == NULL))
438 return -EIO;
439
440 if (entries > *count)
441 entries = *count;
442
443 for (i = 0; i < entries; i++) {
444 flavors[i] = be32_to_cpup(p++);
445 dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
446 }
447 *count = i;
448
449 return 0;
450}
451
452static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
453 struct xdr_stream *xdr,
454 void *data)
455{
456 struct mountres *res = data;
457 int status;
458
459 status = decode_fhs_status(xdr, res);
460 if (unlikely(status != 0 || res->errno != 0))
461 return status;
462 status = decode_fhandle3(xdr, res);
463 if (unlikely(status != 0)) {
464 res->errno = -EBADHANDLE;
465 return 0;
466 }
467 return decode_auth_flavors(xdr, res);
468}
469
470static const struct rpc_procinfo mnt_procedures[] = {
471 [MOUNTPROC_MNT] = {
472 .p_proc = MOUNTPROC_MNT,
473 .p_encode = mnt_xdr_enc_dirpath,
474 .p_decode = mnt_xdr_dec_mountres,
475 .p_arglen = MNT_enc_dirpath_sz,
476 .p_replen = MNT_dec_mountres_sz,
477 .p_statidx = MOUNTPROC_MNT,
478 .p_name = "MOUNT",
479 },
480 [MOUNTPROC_UMNT] = {
481 .p_proc = MOUNTPROC_UMNT,
482 .p_encode = mnt_xdr_enc_dirpath,
483 .p_arglen = MNT_enc_dirpath_sz,
484 .p_statidx = MOUNTPROC_UMNT,
485 .p_name = "UMOUNT",
486 },
487};
488
489static const struct rpc_procinfo mnt3_procedures[] = {
490 [MOUNTPROC3_MNT] = {
491 .p_proc = MOUNTPROC3_MNT,
492 .p_encode = mnt_xdr_enc_dirpath,
493 .p_decode = mnt_xdr_dec_mountres3,
494 .p_arglen = MNT_enc_dirpath_sz,
495 .p_replen = MNT_dec_mountres3_sz,
496 .p_statidx = MOUNTPROC3_MNT,
497 .p_name = "MOUNT",
498 },
499 [MOUNTPROC3_UMNT] = {
500 .p_proc = MOUNTPROC3_UMNT,
501 .p_encode = mnt_xdr_enc_dirpath,
502 .p_arglen = MNT_enc_dirpath_sz,
503 .p_statidx = MOUNTPROC3_UMNT,
504 .p_name = "UMOUNT",
505 },
506};
507
508static unsigned int mnt_counts[ARRAY_SIZE(mnt_procedures)];
509static const struct rpc_version mnt_version1 = {
510 .number = 1,
511 .nrprocs = ARRAY_SIZE(mnt_procedures),
512 .procs = mnt_procedures,
513 .counts = mnt_counts,
514};
515
516static unsigned int mnt3_counts[ARRAY_SIZE(mnt3_procedures)];
517static const struct rpc_version mnt_version3 = {
518 .number = 3,
519 .nrprocs = ARRAY_SIZE(mnt3_procedures),
520 .procs = mnt3_procedures,
521 .counts = mnt3_counts,
522};
523
524static const struct rpc_version *mnt_version[] = {
525 NULL,
526 &mnt_version1,
527 NULL,
528 &mnt_version3,
529};
530
531static struct rpc_stat mnt_stats;
532
533static const struct rpc_program mnt_program = {
534 .name = "mount",
535 .number = NFS_MNT_PROGRAM,
536 .nrvers = ARRAY_SIZE(mnt_version),
537 .version = mnt_version,
538 .stats = &mnt_stats,
539};
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. On
143 * successful return, the auth_flavs list and auth_flav_len will be populated
144 * with the list from the server or a faked-up list if the server didn't
145 * provide one.
146 */
147int nfs_mount(struct nfs_mount_request *info)
148{
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 = info->sap,
162 .addrsize = info->salen,
163 .servername = info->hostname,
164 .program = &mnt_program,
165 .version = info->version,
166 .authflavor = RPC_AUTH_UNIX,
167 };
168 struct rpc_clnt *mnt_clnt;
169 int status;
170
171 dprintk("NFS: sending MNT request for %s:%s\n",
172 (info->hostname ? info->hostname : "server"),
173 info->dirpath);
174
175 if (strlen(info->dirpath) > MNTPATHLEN)
176 return -ENAMETOOLONG;
177
178 if (info->noresvport)
179 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
180
181 mnt_clnt = rpc_create(&args);
182 if (IS_ERR(mnt_clnt))
183 goto out_clnt_err;
184
185 if (info->version == NFS_MNT3_VERSION)
186 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
187 else
188 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
189
190 status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT);
191 rpc_shutdown_client(mnt_clnt);
192
193 if (status < 0)
194 goto out_call_err;
195 if (result.errno != 0)
196 goto out_mnt_err;
197
198 dprintk("NFS: MNT request succeeded\n");
199 status = 0;
200
201 /*
202 * If the server didn't provide a flavor list, allow the
203 * client to try any flavor.
204 */
205 if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) {
206 dprintk("NFS: Faking up auth_flavs list\n");
207 info->auth_flavs[0] = RPC_AUTH_NULL;
208 *info->auth_flav_len = 1;
209 }
210out:
211 return status;
212
213out_clnt_err:
214 status = PTR_ERR(mnt_clnt);
215 dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
216 goto out;
217
218out_call_err:
219 dprintk("NFS: MNT request failed, status=%d\n", status);
220 goto out;
221
222out_mnt_err:
223 dprintk("NFS: MNT server returned result %d\n", result.errno);
224 status = result.errno;
225 goto out;
226}
227
228/**
229 * nfs_umount - Notify a server that we have unmounted this export
230 * @info: pointer to umount request arguments
231 *
232 * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
233 * use UDP.
234 */
235void nfs_umount(const struct nfs_mount_request *info)
236{
237 static const struct rpc_timeout nfs_umnt_timeout = {
238 .to_initval = 1 * HZ,
239 .to_maxval = 3 * HZ,
240 .to_retries = 2,
241 };
242 struct rpc_create_args args = {
243 .net = info->net,
244 .protocol = IPPROTO_UDP,
245 .address = info->sap,
246 .addrsize = info->salen,
247 .timeout = &nfs_umnt_timeout,
248 .servername = info->hostname,
249 .program = &mnt_program,
250 .version = info->version,
251 .authflavor = RPC_AUTH_UNIX,
252 .flags = RPC_CLNT_CREATE_NOPING,
253 };
254 struct rpc_message msg = {
255 .rpc_argp = info->dirpath,
256 };
257 struct rpc_clnt *clnt;
258 int status;
259
260 if (strlen(info->dirpath) > MNTPATHLEN)
261 return;
262
263 if (info->noresvport)
264 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
265
266 clnt = rpc_create(&args);
267 if (IS_ERR(clnt))
268 goto out_clnt_err;
269
270 dprintk("NFS: sending UMNT request for %s:%s\n",
271 (info->hostname ? info->hostname : "server"), info->dirpath);
272
273 if (info->version == NFS_MNT3_VERSION)
274 msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
275 else
276 msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];
277
278 status = rpc_call_sync(clnt, &msg, 0);
279 rpc_shutdown_client(clnt);
280
281 if (unlikely(status < 0))
282 goto out_call_err;
283
284 return;
285
286out_clnt_err:
287 dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
288 PTR_ERR(clnt));
289 return;
290
291out_call_err:
292 dprintk("NFS: UMNT request failed, status=%d\n", status);
293}
294
295/*
296 * XDR encode/decode functions for MOUNT
297 */
298
299static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
300{
301 const u32 pathname_len = strlen(pathname);
302 __be32 *p;
303
304 p = xdr_reserve_space(xdr, 4 + pathname_len);
305 xdr_encode_opaque(p, pathname, pathname_len);
306}
307
308static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr,
309 const char *dirpath)
310{
311 encode_mntdirpath(xdr, dirpath);
312}
313
314/*
315 * RFC 1094: "A non-zero status indicates some sort of error. In this
316 * case, the status is a UNIX error number." This can be problematic
317 * if the server and client use different errno values for the same
318 * error.
319 *
320 * However, the OpenGroup XNFS spec provides a simple mapping that is
321 * independent of local errno values on the server and the client.
322 */
323static int decode_status(struct xdr_stream *xdr, struct mountres *res)
324{
325 unsigned int i;
326 u32 status;
327 __be32 *p;
328
329 p = xdr_inline_decode(xdr, 4);
330 if (unlikely(p == NULL))
331 return -EIO;
332 status = be32_to_cpup(p);
333
334 for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
335 if (mnt_errtbl[i].status == status) {
336 res->errno = mnt_errtbl[i].errno;
337 return 0;
338 }
339 }
340
341 dprintk("NFS: unrecognized MNT status code: %u\n", status);
342 res->errno = -EACCES;
343 return 0;
344}
345
346static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res)
347{
348 struct nfs_fh *fh = res->fh;
349 __be32 *p;
350
351 p = xdr_inline_decode(xdr, NFS2_FHSIZE);
352 if (unlikely(p == NULL))
353 return -EIO;
354
355 fh->size = NFS2_FHSIZE;
356 memcpy(fh->data, p, NFS2_FHSIZE);
357 return 0;
358}
359
360static int mnt_xdr_dec_mountres(struct rpc_rqst *req,
361 struct xdr_stream *xdr,
362 struct mountres *res)
363{
364 int status;
365
366 status = decode_status(xdr, res);
367 if (unlikely(status != 0 || res->errno != 0))
368 return status;
369 return decode_fhandle(xdr, res);
370}
371
372static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
373{
374 unsigned int i;
375 u32 status;
376 __be32 *p;
377
378 p = xdr_inline_decode(xdr, 4);
379 if (unlikely(p == NULL))
380 return -EIO;
381 status = be32_to_cpup(p);
382
383 for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
384 if (mnt3_errtbl[i].status == status) {
385 res->errno = mnt3_errtbl[i].errno;
386 return 0;
387 }
388 }
389
390 dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
391 res->errno = -EACCES;
392 return 0;
393}
394
395static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
396{
397 struct nfs_fh *fh = res->fh;
398 u32 size;
399 __be32 *p;
400
401 p = xdr_inline_decode(xdr, 4);
402 if (unlikely(p == NULL))
403 return -EIO;
404
405 size = be32_to_cpup(p);
406 if (size > NFS3_FHSIZE || size == 0)
407 return -EIO;
408
409 p = xdr_inline_decode(xdr, size);
410 if (unlikely(p == NULL))
411 return -EIO;
412
413 fh->size = size;
414 memcpy(fh->data, p, size);
415 return 0;
416}
417
418static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
419{
420 rpc_authflavor_t *flavors = res->auth_flavors;
421 unsigned int *count = res->auth_count;
422 u32 entries, i;
423 __be32 *p;
424
425 if (*count == 0)
426 return 0;
427
428 p = xdr_inline_decode(xdr, 4);
429 if (unlikely(p == NULL))
430 return -EIO;
431 entries = be32_to_cpup(p);
432 dprintk("NFS: received %u auth flavors\n", entries);
433 if (entries > NFS_MAX_SECFLAVORS)
434 entries = NFS_MAX_SECFLAVORS;
435
436 p = xdr_inline_decode(xdr, 4 * entries);
437 if (unlikely(p == NULL))
438 return -EIO;
439
440 if (entries > *count)
441 entries = *count;
442
443 for (i = 0; i < entries; i++) {
444 flavors[i] = be32_to_cpup(p++);
445 dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
446 }
447 *count = i;
448
449 return 0;
450}
451
452static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
453 struct xdr_stream *xdr,
454 struct mountres *res)
455{
456 int status;
457
458 status = decode_fhs_status(xdr, res);
459 if (unlikely(status != 0 || res->errno != 0))
460 return status;
461 status = decode_fhandle3(xdr, res);
462 if (unlikely(status != 0)) {
463 res->errno = -EBADHANDLE;
464 return 0;
465 }
466 return decode_auth_flavors(xdr, res);
467}
468
469static struct rpc_procinfo mnt_procedures[] = {
470 [MOUNTPROC_MNT] = {
471 .p_proc = MOUNTPROC_MNT,
472 .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath,
473 .p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres,
474 .p_arglen = MNT_enc_dirpath_sz,
475 .p_replen = MNT_dec_mountres_sz,
476 .p_statidx = MOUNTPROC_MNT,
477 .p_name = "MOUNT",
478 },
479 [MOUNTPROC_UMNT] = {
480 .p_proc = MOUNTPROC_UMNT,
481 .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath,
482 .p_arglen = MNT_enc_dirpath_sz,
483 .p_statidx = MOUNTPROC_UMNT,
484 .p_name = "UMOUNT",
485 },
486};
487
488static struct rpc_procinfo mnt3_procedures[] = {
489 [MOUNTPROC3_MNT] = {
490 .p_proc = MOUNTPROC3_MNT,
491 .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath,
492 .p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres3,
493 .p_arglen = MNT_enc_dirpath_sz,
494 .p_replen = MNT_dec_mountres3_sz,
495 .p_statidx = MOUNTPROC3_MNT,
496 .p_name = "MOUNT",
497 },
498 [MOUNTPROC3_UMNT] = {
499 .p_proc = MOUNTPROC3_UMNT,
500 .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath,
501 .p_arglen = MNT_enc_dirpath_sz,
502 .p_statidx = MOUNTPROC3_UMNT,
503 .p_name = "UMOUNT",
504 },
505};
506
507
508static const struct rpc_version mnt_version1 = {
509 .number = 1,
510 .nrprocs = ARRAY_SIZE(mnt_procedures),
511 .procs = mnt_procedures,
512};
513
514static const struct rpc_version mnt_version3 = {
515 .number = 3,
516 .nrprocs = ARRAY_SIZE(mnt3_procedures),
517 .procs = mnt3_procedures,
518};
519
520static const struct rpc_version *mnt_version[] = {
521 NULL,
522 &mnt_version1,
523 NULL,
524 &mnt_version3,
525};
526
527static struct rpc_stat mnt_stats;
528
529static const struct rpc_program mnt_program = {
530 .name = "mount",
531 .number = NFS_MNT_PROGRAM,
532 .nrvers = ARRAY_SIZE(mnt_version),
533 .version = mnt_version,
534 .stats = &mnt_stats,
535};