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Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "nfs4session.h"
67 #include "pnfs.h"
68 #include "nfs.h"
69
70 #define NFSDBG_FACILITY NFSDBG_VFS
71 #define NFS_TEXT_DATA 1
72
73 #if IS_ENABLED(CONFIG_NFS_V3)
74 #define NFS_DEFAULT_VERSION 3
75 #else
76 #define NFS_DEFAULT_VERSION 2
77 #endif
78
79 enum {
80 /* Mount options that take no arguments */
81 Opt_soft, Opt_hard,
82 Opt_posix, Opt_noposix,
83 Opt_cto, Opt_nocto,
84 Opt_ac, Opt_noac,
85 Opt_lock, Opt_nolock,
86 Opt_udp, Opt_tcp, Opt_rdma,
87 Opt_acl, Opt_noacl,
88 Opt_rdirplus, Opt_nordirplus,
89 Opt_sharecache, Opt_nosharecache,
90 Opt_resvport, Opt_noresvport,
91 Opt_fscache, Opt_nofscache,
92 Opt_migration, Opt_nomigration,
93
94 /* Mount options that take integer arguments */
95 Opt_port,
96 Opt_rsize, Opt_wsize, Opt_bsize,
97 Opt_timeo, Opt_retrans,
98 Opt_acregmin, Opt_acregmax,
99 Opt_acdirmin, Opt_acdirmax,
100 Opt_actimeo,
101 Opt_namelen,
102 Opt_mountport,
103 Opt_mountvers,
104 Opt_minorversion,
105
106 /* Mount options that take string arguments */
107 Opt_nfsvers,
108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
109 Opt_addr, Opt_mountaddr, Opt_clientaddr,
110 Opt_lookupcache,
111 Opt_fscache_uniq,
112 Opt_local_lock,
113
114 /* Special mount options */
115 Opt_userspace, Opt_deprecated, Opt_sloppy,
116
117 Opt_err
118 };
119
120 static const match_table_t nfs_mount_option_tokens = {
121 { Opt_userspace, "bg" },
122 { Opt_userspace, "fg" },
123 { Opt_userspace, "retry=%s" },
124
125 { Opt_sloppy, "sloppy" },
126
127 { Opt_soft, "soft" },
128 { Opt_hard, "hard" },
129 { Opt_deprecated, "intr" },
130 { Opt_deprecated, "nointr" },
131 { Opt_posix, "posix" },
132 { Opt_noposix, "noposix" },
133 { Opt_cto, "cto" },
134 { Opt_nocto, "nocto" },
135 { Opt_ac, "ac" },
136 { Opt_noac, "noac" },
137 { Opt_lock, "lock" },
138 { Opt_nolock, "nolock" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152 { Opt_migration, "migration" },
153 { Opt_nomigration, "nomigration" },
154
155 { Opt_port, "port=%s" },
156 { Opt_rsize, "rsize=%s" },
157 { Opt_wsize, "wsize=%s" },
158 { Opt_bsize, "bsize=%s" },
159 { Opt_timeo, "timeo=%s" },
160 { Opt_retrans, "retrans=%s" },
161 { Opt_acregmin, "acregmin=%s" },
162 { Opt_acregmax, "acregmax=%s" },
163 { Opt_acdirmin, "acdirmin=%s" },
164 { Opt_acdirmax, "acdirmax=%s" },
165 { Opt_actimeo, "actimeo=%s" },
166 { Opt_namelen, "namlen=%s" },
167 { Opt_mountport, "mountport=%s" },
168 { Opt_mountvers, "mountvers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_nfsvers, "nfsvers=%s" },
172 { Opt_nfsvers, "vers=%s" },
173
174 { Opt_sec, "sec=%s" },
175 { Opt_proto, "proto=%s" },
176 { Opt_mountproto, "mountproto=%s" },
177 { Opt_addr, "addr=%s" },
178 { Opt_clientaddr, "clientaddr=%s" },
179 { Opt_mounthost, "mounthost=%s" },
180 { Opt_mountaddr, "mountaddr=%s" },
181
182 { Opt_lookupcache, "lookupcache=%s" },
183 { Opt_fscache_uniq, "fsc=%s" },
184 { Opt_local_lock, "local_lock=%s" },
185
186 /* The following needs to be listed after all other options */
187 { Opt_nfsvers, "v%s" },
188
189 { Opt_err, NULL }
190 };
191
192 enum {
193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
194
195 Opt_xprt_err
196 };
197
198 static const match_table_t nfs_xprt_protocol_tokens = {
199 { Opt_xprt_udp, "udp" },
200 { Opt_xprt_udp6, "udp6" },
201 { Opt_xprt_tcp, "tcp" },
202 { Opt_xprt_tcp6, "tcp6" },
203 { Opt_xprt_rdma, "rdma" },
204
205 { Opt_xprt_err, NULL }
206 };
207
208 enum {
209 Opt_sec_none, Opt_sec_sys,
210 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
211 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
212 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
213
214 Opt_sec_err
215 };
216
217 static const match_table_t nfs_secflavor_tokens = {
218 { Opt_sec_none, "none" },
219 { Opt_sec_none, "null" },
220 { Opt_sec_sys, "sys" },
221
222 { Opt_sec_krb5, "krb5" },
223 { Opt_sec_krb5i, "krb5i" },
224 { Opt_sec_krb5p, "krb5p" },
225
226 { Opt_sec_lkey, "lkey" },
227 { Opt_sec_lkeyi, "lkeyi" },
228 { Opt_sec_lkeyp, "lkeyp" },
229
230 { Opt_sec_spkm, "spkm3" },
231 { Opt_sec_spkmi, "spkm3i" },
232 { Opt_sec_spkmp, "spkm3p" },
233
234 { Opt_sec_err, NULL }
235 };
236
237 enum {
238 Opt_lookupcache_all, Opt_lookupcache_positive,
239 Opt_lookupcache_none,
240
241 Opt_lookupcache_err
242 };
243
244 static match_table_t nfs_lookupcache_tokens = {
245 { Opt_lookupcache_all, "all" },
246 { Opt_lookupcache_positive, "pos" },
247 { Opt_lookupcache_positive, "positive" },
248 { Opt_lookupcache_none, "none" },
249
250 { Opt_lookupcache_err, NULL }
251 };
252
253 enum {
254 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
255 Opt_local_lock_none,
256
257 Opt_local_lock_err
258 };
259
260 static match_table_t nfs_local_lock_tokens = {
261 { Opt_local_lock_all, "all" },
262 { Opt_local_lock_flock, "flock" },
263 { Opt_local_lock_posix, "posix" },
264 { Opt_local_lock_none, "none" },
265
266 { Opt_local_lock_err, NULL }
267 };
268
269 enum {
270 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
271 Opt_vers_4_1,
272
273 Opt_vers_err
274 };
275
276 static match_table_t nfs_vers_tokens = {
277 { Opt_vers_2, "2" },
278 { Opt_vers_3, "3" },
279 { Opt_vers_4, "4" },
280 { Opt_vers_4_0, "4.0" },
281 { Opt_vers_4_1, "4.1" },
282
283 { Opt_vers_err, NULL }
284 };
285
286 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
287 int flags, const char *dev_name, void *raw_data);
288
289 struct file_system_type nfs_fs_type = {
290 .owner = THIS_MODULE,
291 .name = "nfs",
292 .mount = nfs_fs_mount,
293 .kill_sb = nfs_kill_super,
294 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
295 };
296 EXPORT_SYMBOL_GPL(nfs_fs_type);
297
298 struct file_system_type nfs_xdev_fs_type = {
299 .owner = THIS_MODULE,
300 .name = "nfs",
301 .mount = nfs_xdev_mount,
302 .kill_sb = nfs_kill_super,
303 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
304 };
305
306 const struct super_operations nfs_sops = {
307 .alloc_inode = nfs_alloc_inode,
308 .destroy_inode = nfs_destroy_inode,
309 .write_inode = nfs_write_inode,
310 .drop_inode = nfs_drop_inode,
311 .put_super = nfs_put_super,
312 .statfs = nfs_statfs,
313 .evict_inode = nfs_evict_inode,
314 .umount_begin = nfs_umount_begin,
315 .show_options = nfs_show_options,
316 .show_devname = nfs_show_devname,
317 .show_path = nfs_show_path,
318 .show_stats = nfs_show_stats,
319 .remount_fs = nfs_remount,
320 };
321 EXPORT_SYMBOL_GPL(nfs_sops);
322
323 #if IS_ENABLED(CONFIG_NFS_V4)
324 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
325 static int nfs4_validate_mount_data(void *options,
326 struct nfs_parsed_mount_data *args, const char *dev_name);
327
328 struct file_system_type nfs4_fs_type = {
329 .owner = THIS_MODULE,
330 .name = "nfs4",
331 .mount = nfs_fs_mount,
332 .kill_sb = nfs_kill_super,
333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
334 };
335 EXPORT_SYMBOL_GPL(nfs4_fs_type);
336
337 static int __init register_nfs4_fs(void)
338 {
339 return register_filesystem(&nfs4_fs_type);
340 }
341
342 static void unregister_nfs4_fs(void)
343 {
344 unregister_filesystem(&nfs4_fs_type);
345 }
346 #else
347 static int __init register_nfs4_fs(void)
348 {
349 return 0;
350 }
351
352 static void unregister_nfs4_fs(void)
353 {
354 }
355 #endif
356
357 static struct shrinker acl_shrinker = {
358 .shrink = nfs_access_cache_shrinker,
359 .seeks = DEFAULT_SEEKS,
360 };
361
362 /*
363 * Register the NFS filesystems
364 */
365 int __init register_nfs_fs(void)
366 {
367 int ret;
368
369 ret = register_filesystem(&nfs_fs_type);
370 if (ret < 0)
371 goto error_0;
372
373 ret = register_nfs4_fs();
374 if (ret < 0)
375 goto error_1;
376
377 ret = nfs_register_sysctl();
378 if (ret < 0)
379 goto error_2;
380 register_shrinker(&acl_shrinker);
381 return 0;
382
383 error_2:
384 unregister_nfs4_fs();
385 error_1:
386 unregister_filesystem(&nfs_fs_type);
387 error_0:
388 return ret;
389 }
390
391 /*
392 * Unregister the NFS filesystems
393 */
394 void __exit unregister_nfs_fs(void)
395 {
396 unregister_shrinker(&acl_shrinker);
397 nfs_unregister_sysctl();
398 unregister_nfs4_fs();
399 unregister_filesystem(&nfs_fs_type);
400 }
401
402 void nfs_sb_active(struct super_block *sb)
403 {
404 struct nfs_server *server = NFS_SB(sb);
405
406 if (atomic_inc_return(&server->active) == 1)
407 atomic_inc(&sb->s_active);
408 }
409 EXPORT_SYMBOL_GPL(nfs_sb_active);
410
411 void nfs_sb_deactive(struct super_block *sb)
412 {
413 struct nfs_server *server = NFS_SB(sb);
414
415 if (atomic_dec_and_test(&server->active))
416 deactivate_super(sb);
417 }
418 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
419
420 /*
421 * Deliver file system statistics to userspace
422 */
423 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
424 {
425 struct nfs_server *server = NFS_SB(dentry->d_sb);
426 unsigned char blockbits;
427 unsigned long blockres;
428 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
429 struct nfs_fsstat res;
430 int error = -ENOMEM;
431
432 res.fattr = nfs_alloc_fattr();
433 if (res.fattr == NULL)
434 goto out_err;
435
436 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
437 if (unlikely(error == -ESTALE)) {
438 struct dentry *pd_dentry;
439
440 pd_dentry = dget_parent(dentry);
441 if (pd_dentry != NULL) {
442 nfs_zap_caches(pd_dentry->d_inode);
443 dput(pd_dentry);
444 }
445 }
446 nfs_free_fattr(res.fattr);
447 if (error < 0)
448 goto out_err;
449
450 buf->f_type = NFS_SUPER_MAGIC;
451
452 /*
453 * Current versions of glibc do not correctly handle the
454 * case where f_frsize != f_bsize. Eventually we want to
455 * report the value of wtmult in this field.
456 */
457 buf->f_frsize = dentry->d_sb->s_blocksize;
458
459 /*
460 * On most *nix systems, f_blocks, f_bfree, and f_bavail
461 * are reported in units of f_frsize. Linux hasn't had
462 * an f_frsize field in its statfs struct until recently,
463 * thus historically Linux's sys_statfs reports these
464 * fields in units of f_bsize.
465 */
466 buf->f_bsize = dentry->d_sb->s_blocksize;
467 blockbits = dentry->d_sb->s_blocksize_bits;
468 blockres = (1 << blockbits) - 1;
469 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
470 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
471 buf->f_bavail = (res.abytes + blockres) >> blockbits;
472
473 buf->f_files = res.tfiles;
474 buf->f_ffree = res.afiles;
475
476 buf->f_namelen = server->namelen;
477
478 return 0;
479
480 out_err:
481 dprintk("%s: statfs error = %d\n", __func__, -error);
482 return error;
483 }
484 EXPORT_SYMBOL_GPL(nfs_statfs);
485
486 /*
487 * Map the security flavour number to a name
488 */
489 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
490 {
491 static const struct {
492 rpc_authflavor_t flavour;
493 const char *str;
494 } sec_flavours[] = {
495 { RPC_AUTH_NULL, "null" },
496 { RPC_AUTH_UNIX, "sys" },
497 { RPC_AUTH_GSS_KRB5, "krb5" },
498 { RPC_AUTH_GSS_KRB5I, "krb5i" },
499 { RPC_AUTH_GSS_KRB5P, "krb5p" },
500 { RPC_AUTH_GSS_LKEY, "lkey" },
501 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
502 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
503 { RPC_AUTH_GSS_SPKM, "spkm" },
504 { RPC_AUTH_GSS_SPKMI, "spkmi" },
505 { RPC_AUTH_GSS_SPKMP, "spkmp" },
506 { UINT_MAX, "unknown" }
507 };
508 int i;
509
510 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
511 if (sec_flavours[i].flavour == flavour)
512 break;
513 }
514 return sec_flavours[i].str;
515 }
516
517 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
518 int showdefaults)
519 {
520 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
521
522 seq_printf(m, ",mountproto=");
523 switch (sap->sa_family) {
524 case AF_INET:
525 switch (nfss->mountd_protocol) {
526 case IPPROTO_UDP:
527 seq_printf(m, RPCBIND_NETID_UDP);
528 break;
529 case IPPROTO_TCP:
530 seq_printf(m, RPCBIND_NETID_TCP);
531 break;
532 default:
533 if (showdefaults)
534 seq_printf(m, "auto");
535 }
536 break;
537 case AF_INET6:
538 switch (nfss->mountd_protocol) {
539 case IPPROTO_UDP:
540 seq_printf(m, RPCBIND_NETID_UDP6);
541 break;
542 case IPPROTO_TCP:
543 seq_printf(m, RPCBIND_NETID_TCP6);
544 break;
545 default:
546 if (showdefaults)
547 seq_printf(m, "auto");
548 }
549 break;
550 default:
551 if (showdefaults)
552 seq_printf(m, "auto");
553 }
554 }
555
556 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
557 int showdefaults)
558 {
559 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
560
561 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
562 return;
563
564 switch (sap->sa_family) {
565 case AF_INET: {
566 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
567 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
568 break;
569 }
570 case AF_INET6: {
571 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
572 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
573 break;
574 }
575 default:
576 if (showdefaults)
577 seq_printf(m, ",mountaddr=unspecified");
578 }
579
580 if (nfss->mountd_version || showdefaults)
581 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
582 if ((nfss->mountd_port &&
583 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
584 showdefaults)
585 seq_printf(m, ",mountport=%u", nfss->mountd_port);
586
587 nfs_show_mountd_netid(m, nfss, showdefaults);
588 }
589
590 #if IS_ENABLED(CONFIG_NFS_V4)
591 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
592 int showdefaults)
593 {
594 struct nfs_client *clp = nfss->nfs_client;
595
596 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
597 }
598 #else
599 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
600 int showdefaults)
601 {
602 }
603 #endif
604
605 static void nfs_show_nfs_version(struct seq_file *m,
606 unsigned int version,
607 unsigned int minorversion)
608 {
609 seq_printf(m, ",vers=%u", version);
610 if (version == 4)
611 seq_printf(m, ".%u", minorversion);
612 }
613
614 /*
615 * Describe the mount options in force on this server representation
616 */
617 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
618 int showdefaults)
619 {
620 static const struct proc_nfs_info {
621 int flag;
622 const char *str;
623 const char *nostr;
624 } nfs_info[] = {
625 { NFS_MOUNT_SOFT, ",soft", ",hard" },
626 { NFS_MOUNT_POSIX, ",posix", "" },
627 { NFS_MOUNT_NOCTO, ",nocto", "" },
628 { NFS_MOUNT_NOAC, ",noac", "" },
629 { NFS_MOUNT_NONLM, ",nolock", "" },
630 { NFS_MOUNT_NOACL, ",noacl", "" },
631 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
632 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
633 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
634 { 0, NULL, NULL }
635 };
636 const struct proc_nfs_info *nfs_infop;
637 struct nfs_client *clp = nfss->nfs_client;
638 u32 version = clp->rpc_ops->version;
639 int local_flock, local_fcntl;
640
641 nfs_show_nfs_version(m, version, clp->cl_minorversion);
642 seq_printf(m, ",rsize=%u", nfss->rsize);
643 seq_printf(m, ",wsize=%u", nfss->wsize);
644 if (nfss->bsize != 0)
645 seq_printf(m, ",bsize=%u", nfss->bsize);
646 seq_printf(m, ",namlen=%u", nfss->namelen);
647 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
648 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
649 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
650 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
651 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
652 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
653 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
654 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
655 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
656 if (nfss->flags & nfs_infop->flag)
657 seq_puts(m, nfs_infop->str);
658 else
659 seq_puts(m, nfs_infop->nostr);
660 }
661 rcu_read_lock();
662 seq_printf(m, ",proto=%s",
663 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
664 rcu_read_unlock();
665 if (version == 4) {
666 if (nfss->port != NFS_PORT)
667 seq_printf(m, ",port=%u", nfss->port);
668 } else
669 if (nfss->port)
670 seq_printf(m, ",port=%u", nfss->port);
671
672 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
673 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
674 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
675
676 if (version != 4)
677 nfs_show_mountd_options(m, nfss, showdefaults);
678 else
679 nfs_show_nfsv4_options(m, nfss, showdefaults);
680
681 if (nfss->options & NFS_OPTION_FSCACHE)
682 seq_printf(m, ",fsc");
683
684 if (nfss->options & NFS_OPTION_MIGRATION)
685 seq_printf(m, ",migration");
686
687 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
688 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
689 seq_printf(m, ",lookupcache=none");
690 else
691 seq_printf(m, ",lookupcache=pos");
692 }
693
694 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
695 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
696
697 if (!local_flock && !local_fcntl)
698 seq_printf(m, ",local_lock=none");
699 else if (local_flock && local_fcntl)
700 seq_printf(m, ",local_lock=all");
701 else if (local_flock)
702 seq_printf(m, ",local_lock=flock");
703 else
704 seq_printf(m, ",local_lock=posix");
705 }
706
707 /*
708 * Describe the mount options on this VFS mountpoint
709 */
710 int nfs_show_options(struct seq_file *m, struct dentry *root)
711 {
712 struct nfs_server *nfss = NFS_SB(root->d_sb);
713
714 nfs_show_mount_options(m, nfss, 0);
715
716 rcu_read_lock();
717 seq_printf(m, ",addr=%s",
718 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
719 RPC_DISPLAY_ADDR));
720 rcu_read_unlock();
721
722 return 0;
723 }
724 EXPORT_SYMBOL_GPL(nfs_show_options);
725
726 #if IS_ENABLED(CONFIG_NFS_V4)
727 #ifdef CONFIG_NFS_V4_1
728 static void show_sessions(struct seq_file *m, struct nfs_server *server)
729 {
730 if (nfs4_has_session(server->nfs_client))
731 seq_printf(m, ",sessions");
732 }
733 #else
734 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
735 #endif
736 #endif
737
738 #ifdef CONFIG_NFS_V4_1
739 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
740 {
741 seq_printf(m, ",pnfs=");
742 if (server->pnfs_curr_ld)
743 seq_printf(m, "%s", server->pnfs_curr_ld->name);
744 else
745 seq_printf(m, "not configured");
746 }
747
748 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
749 {
750 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
751 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
752 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
753 "date='%llu,%u'",
754 impl_id->name, impl_id->domain,
755 impl_id->date.seconds, impl_id->date.nseconds);
756 }
757 }
758 #else
759 #if IS_ENABLED(CONFIG_NFS_V4)
760 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
761 {
762 }
763 #endif
764 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
765 {
766 }
767 #endif
768
769 int nfs_show_devname(struct seq_file *m, struct dentry *root)
770 {
771 char *page = (char *) __get_free_page(GFP_KERNEL);
772 char *devname, *dummy;
773 int err = 0;
774 if (!page)
775 return -ENOMEM;
776 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
777 if (IS_ERR(devname))
778 err = PTR_ERR(devname);
779 else
780 seq_escape(m, devname, " \t\n\\");
781 free_page((unsigned long)page);
782 return err;
783 }
784 EXPORT_SYMBOL_GPL(nfs_show_devname);
785
786 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
787 {
788 seq_puts(m, "/");
789 return 0;
790 }
791 EXPORT_SYMBOL_GPL(nfs_show_path);
792
793 /*
794 * Present statistical information for this VFS mountpoint
795 */
796 int nfs_show_stats(struct seq_file *m, struct dentry *root)
797 {
798 int i, cpu;
799 struct nfs_server *nfss = NFS_SB(root->d_sb);
800 struct rpc_auth *auth = nfss->client->cl_auth;
801 struct nfs_iostats totals = { };
802
803 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
804
805 /*
806 * Display all mount option settings
807 */
808 seq_printf(m, "\n\topts:\t");
809 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
810 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
811 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
812 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
813 nfs_show_mount_options(m, nfss, 1);
814
815 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
816
817 show_implementation_id(m, nfss);
818
819 seq_printf(m, "\n\tcaps:\t");
820 seq_printf(m, "caps=0x%x", nfss->caps);
821 seq_printf(m, ",wtmult=%u", nfss->wtmult);
822 seq_printf(m, ",dtsize=%u", nfss->dtsize);
823 seq_printf(m, ",bsize=%u", nfss->bsize);
824 seq_printf(m, ",namlen=%u", nfss->namelen);
825
826 #if IS_ENABLED(CONFIG_NFS_V4)
827 if (nfss->nfs_client->rpc_ops->version == 4) {
828 seq_printf(m, "\n\tnfsv4:\t");
829 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
830 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
831 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
832 show_sessions(m, nfss);
833 show_pnfs(m, nfss);
834 }
835 #endif
836
837 /*
838 * Display security flavor in effect for this mount
839 */
840 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
841 if (auth->au_flavor)
842 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
843
844 /*
845 * Display superblock I/O counters
846 */
847 for_each_possible_cpu(cpu) {
848 struct nfs_iostats *stats;
849
850 preempt_disable();
851 stats = per_cpu_ptr(nfss->io_stats, cpu);
852
853 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
854 totals.events[i] += stats->events[i];
855 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
856 totals.bytes[i] += stats->bytes[i];
857 #ifdef CONFIG_NFS_FSCACHE
858 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
859 totals.fscache[i] += stats->fscache[i];
860 #endif
861
862 preempt_enable();
863 }
864
865 seq_printf(m, "\n\tevents:\t");
866 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
867 seq_printf(m, "%lu ", totals.events[i]);
868 seq_printf(m, "\n\tbytes:\t");
869 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
870 seq_printf(m, "%Lu ", totals.bytes[i]);
871 #ifdef CONFIG_NFS_FSCACHE
872 if (nfss->options & NFS_OPTION_FSCACHE) {
873 seq_printf(m, "\n\tfsc:\t");
874 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
875 seq_printf(m, "%Lu ", totals.bytes[i]);
876 }
877 #endif
878 seq_printf(m, "\n");
879
880 rpc_print_iostats(m, nfss->client);
881
882 return 0;
883 }
884 EXPORT_SYMBOL_GPL(nfs_show_stats);
885
886 /*
887 * Begin unmount by attempting to remove all automounted mountpoints we added
888 * in response to xdev traversals and referrals
889 */
890 void nfs_umount_begin(struct super_block *sb)
891 {
892 struct nfs_server *server;
893 struct rpc_clnt *rpc;
894
895 server = NFS_SB(sb);
896 /* -EIO all pending I/O */
897 rpc = server->client_acl;
898 if (!IS_ERR(rpc))
899 rpc_killall_tasks(rpc);
900 rpc = server->client;
901 if (!IS_ERR(rpc))
902 rpc_killall_tasks(rpc);
903 }
904 EXPORT_SYMBOL_GPL(nfs_umount_begin);
905
906 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
907 {
908 struct nfs_parsed_mount_data *data;
909
910 data = kzalloc(sizeof(*data), GFP_KERNEL);
911 if (data) {
912 data->acregmin = NFS_DEF_ACREGMIN;
913 data->acregmax = NFS_DEF_ACREGMAX;
914 data->acdirmin = NFS_DEF_ACDIRMIN;
915 data->acdirmax = NFS_DEF_ACDIRMAX;
916 data->mount_server.port = NFS_UNSPEC_PORT;
917 data->nfs_server.port = NFS_UNSPEC_PORT;
918 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
919 data->auth_flavors[0] = RPC_AUTH_UNIX;
920 data->auth_flavor_len = 1;
921 data->minorversion = 0;
922 data->need_mount = true;
923 data->net = current->nsproxy->net_ns;
924 security_init_mnt_opts(&data->lsm_opts);
925 }
926 return data;
927 }
928
929 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
930 {
931 if (data) {
932 kfree(data->client_address);
933 kfree(data->mount_server.hostname);
934 kfree(data->nfs_server.export_path);
935 kfree(data->nfs_server.hostname);
936 kfree(data->fscache_uniq);
937 security_free_mnt_opts(&data->lsm_opts);
938 kfree(data);
939 }
940 }
941
942 /*
943 * Sanity-check a server address provided by the mount command.
944 *
945 * Address family must be initialized, and address must not be
946 * the ANY address for that family.
947 */
948 static int nfs_verify_server_address(struct sockaddr *addr)
949 {
950 switch (addr->sa_family) {
951 case AF_INET: {
952 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
953 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
954 }
955 case AF_INET6: {
956 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
957 return !ipv6_addr_any(sa);
958 }
959 }
960
961 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
962 return 0;
963 }
964
965 /*
966 * Select between a default port value and a user-specified port value.
967 * If a zero value is set, then autobind will be used.
968 */
969 static void nfs_set_port(struct sockaddr *sap, int *port,
970 const unsigned short default_port)
971 {
972 if (*port == NFS_UNSPEC_PORT)
973 *port = default_port;
974
975 rpc_set_port(sap, *port);
976 }
977
978 /*
979 * Sanity check the NFS transport protocol.
980 *
981 */
982 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
983 {
984 switch (mnt->nfs_server.protocol) {
985 case XPRT_TRANSPORT_UDP:
986 case XPRT_TRANSPORT_TCP:
987 case XPRT_TRANSPORT_RDMA:
988 break;
989 default:
990 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
991 }
992 }
993
994 /*
995 * For text based NFSv2/v3 mounts, the mount protocol transport default
996 * settings should depend upon the specified NFS transport.
997 */
998 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
999 {
1000 nfs_validate_transport_protocol(mnt);
1001
1002 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1003 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1004 return;
1005 switch (mnt->nfs_server.protocol) {
1006 case XPRT_TRANSPORT_UDP:
1007 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1008 break;
1009 case XPRT_TRANSPORT_TCP:
1010 case XPRT_TRANSPORT_RDMA:
1011 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1012 }
1013 }
1014
1015 /*
1016 * Parse the value of the 'sec=' option.
1017 */
1018 static int nfs_parse_security_flavors(char *value,
1019 struct nfs_parsed_mount_data *mnt)
1020 {
1021 substring_t args[MAX_OPT_ARGS];
1022
1023 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1024
1025 switch (match_token(value, nfs_secflavor_tokens, args)) {
1026 case Opt_sec_none:
1027 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1028 break;
1029 case Opt_sec_sys:
1030 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1031 break;
1032 case Opt_sec_krb5:
1033 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1034 break;
1035 case Opt_sec_krb5i:
1036 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1037 break;
1038 case Opt_sec_krb5p:
1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1040 break;
1041 case Opt_sec_lkey:
1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1043 break;
1044 case Opt_sec_lkeyi:
1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1046 break;
1047 case Opt_sec_lkeyp:
1048 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1049 break;
1050 case Opt_sec_spkm:
1051 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1052 break;
1053 case Opt_sec_spkmi:
1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1055 break;
1056 case Opt_sec_spkmp:
1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1058 break;
1059 default:
1060 return 0;
1061 }
1062
1063 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1064 mnt->auth_flavor_len = 1;
1065 return 1;
1066 }
1067
1068 static int nfs_parse_version_string(char *string,
1069 struct nfs_parsed_mount_data *mnt,
1070 substring_t *args)
1071 {
1072 mnt->flags &= ~NFS_MOUNT_VER3;
1073 switch (match_token(string, nfs_vers_tokens, args)) {
1074 case Opt_vers_2:
1075 mnt->version = 2;
1076 break;
1077 case Opt_vers_3:
1078 mnt->flags |= NFS_MOUNT_VER3;
1079 mnt->version = 3;
1080 break;
1081 case Opt_vers_4:
1082 /* Backward compatibility option. In future,
1083 * the mount program should always supply
1084 * a NFSv4 minor version number.
1085 */
1086 mnt->version = 4;
1087 break;
1088 case Opt_vers_4_0:
1089 mnt->version = 4;
1090 mnt->minorversion = 0;
1091 break;
1092 case Opt_vers_4_1:
1093 mnt->version = 4;
1094 mnt->minorversion = 1;
1095 break;
1096 default:
1097 return 0;
1098 }
1099 return 1;
1100 }
1101
1102 static int nfs_get_option_str(substring_t args[], char **option)
1103 {
1104 kfree(*option);
1105 *option = match_strdup(args);
1106 return !*option;
1107 }
1108
1109 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1110 {
1111 int rc;
1112 char *string;
1113
1114 string = match_strdup(args);
1115 if (string == NULL)
1116 return -ENOMEM;
1117 rc = kstrtoul(string, 10, option);
1118 kfree(string);
1119
1120 return rc;
1121 }
1122
1123 /*
1124 * Error-check and convert a string of mount options from user space into
1125 * a data structure. The whole mount string is processed; bad options are
1126 * skipped as they are encountered. If there were no errors, return 1;
1127 * otherwise return 0 (zero).
1128 */
1129 static int nfs_parse_mount_options(char *raw,
1130 struct nfs_parsed_mount_data *mnt)
1131 {
1132 char *p, *string, *secdata;
1133 int rc, sloppy = 0, invalid_option = 0;
1134 unsigned short protofamily = AF_UNSPEC;
1135 unsigned short mountfamily = AF_UNSPEC;
1136
1137 if (!raw) {
1138 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1139 return 1;
1140 }
1141 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1142
1143 secdata = alloc_secdata();
1144 if (!secdata)
1145 goto out_nomem;
1146
1147 rc = security_sb_copy_data(raw, secdata);
1148 if (rc)
1149 goto out_security_failure;
1150
1151 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1152 if (rc)
1153 goto out_security_failure;
1154
1155 free_secdata(secdata);
1156
1157 while ((p = strsep(&raw, ",")) != NULL) {
1158 substring_t args[MAX_OPT_ARGS];
1159 unsigned long option;
1160 int token;
1161
1162 if (!*p)
1163 continue;
1164
1165 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1166
1167 token = match_token(p, nfs_mount_option_tokens, args);
1168 switch (token) {
1169
1170 /*
1171 * boolean options: foo/nofoo
1172 */
1173 case Opt_soft:
1174 mnt->flags |= NFS_MOUNT_SOFT;
1175 break;
1176 case Opt_hard:
1177 mnt->flags &= ~NFS_MOUNT_SOFT;
1178 break;
1179 case Opt_posix:
1180 mnt->flags |= NFS_MOUNT_POSIX;
1181 break;
1182 case Opt_noposix:
1183 mnt->flags &= ~NFS_MOUNT_POSIX;
1184 break;
1185 case Opt_cto:
1186 mnt->flags &= ~NFS_MOUNT_NOCTO;
1187 break;
1188 case Opt_nocto:
1189 mnt->flags |= NFS_MOUNT_NOCTO;
1190 break;
1191 case Opt_ac:
1192 mnt->flags &= ~NFS_MOUNT_NOAC;
1193 break;
1194 case Opt_noac:
1195 mnt->flags |= NFS_MOUNT_NOAC;
1196 break;
1197 case Opt_lock:
1198 mnt->flags &= ~NFS_MOUNT_NONLM;
1199 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1200 NFS_MOUNT_LOCAL_FCNTL);
1201 break;
1202 case Opt_nolock:
1203 mnt->flags |= NFS_MOUNT_NONLM;
1204 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1205 NFS_MOUNT_LOCAL_FCNTL);
1206 break;
1207 case Opt_udp:
1208 mnt->flags &= ~NFS_MOUNT_TCP;
1209 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1210 break;
1211 case Opt_tcp:
1212 mnt->flags |= NFS_MOUNT_TCP;
1213 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1214 break;
1215 case Opt_rdma:
1216 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1217 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1218 xprt_load_transport(p);
1219 break;
1220 case Opt_acl:
1221 mnt->flags &= ~NFS_MOUNT_NOACL;
1222 break;
1223 case Opt_noacl:
1224 mnt->flags |= NFS_MOUNT_NOACL;
1225 break;
1226 case Opt_rdirplus:
1227 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1228 break;
1229 case Opt_nordirplus:
1230 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1231 break;
1232 case Opt_sharecache:
1233 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1234 break;
1235 case Opt_nosharecache:
1236 mnt->flags |= NFS_MOUNT_UNSHARED;
1237 break;
1238 case Opt_resvport:
1239 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1240 break;
1241 case Opt_noresvport:
1242 mnt->flags |= NFS_MOUNT_NORESVPORT;
1243 break;
1244 case Opt_fscache:
1245 mnt->options |= NFS_OPTION_FSCACHE;
1246 kfree(mnt->fscache_uniq);
1247 mnt->fscache_uniq = NULL;
1248 break;
1249 case Opt_nofscache:
1250 mnt->options &= ~NFS_OPTION_FSCACHE;
1251 kfree(mnt->fscache_uniq);
1252 mnt->fscache_uniq = NULL;
1253 break;
1254 case Opt_migration:
1255 mnt->options |= NFS_OPTION_MIGRATION;
1256 break;
1257 case Opt_nomigration:
1258 mnt->options &= NFS_OPTION_MIGRATION;
1259 break;
1260
1261 /*
1262 * options that take numeric values
1263 */
1264 case Opt_port:
1265 if (nfs_get_option_ul(args, &option) ||
1266 option > USHRT_MAX)
1267 goto out_invalid_value;
1268 mnt->nfs_server.port = option;
1269 break;
1270 case Opt_rsize:
1271 if (nfs_get_option_ul(args, &option))
1272 goto out_invalid_value;
1273 mnt->rsize = option;
1274 break;
1275 case Opt_wsize:
1276 if (nfs_get_option_ul(args, &option))
1277 goto out_invalid_value;
1278 mnt->wsize = option;
1279 break;
1280 case Opt_bsize:
1281 if (nfs_get_option_ul(args, &option))
1282 goto out_invalid_value;
1283 mnt->bsize = option;
1284 break;
1285 case Opt_timeo:
1286 if (nfs_get_option_ul(args, &option) || option == 0)
1287 goto out_invalid_value;
1288 mnt->timeo = option;
1289 break;
1290 case Opt_retrans:
1291 if (nfs_get_option_ul(args, &option) || option == 0)
1292 goto out_invalid_value;
1293 mnt->retrans = option;
1294 break;
1295 case Opt_acregmin:
1296 if (nfs_get_option_ul(args, &option))
1297 goto out_invalid_value;
1298 mnt->acregmin = option;
1299 break;
1300 case Opt_acregmax:
1301 if (nfs_get_option_ul(args, &option))
1302 goto out_invalid_value;
1303 mnt->acregmax = option;
1304 break;
1305 case Opt_acdirmin:
1306 if (nfs_get_option_ul(args, &option))
1307 goto out_invalid_value;
1308 mnt->acdirmin = option;
1309 break;
1310 case Opt_acdirmax:
1311 if (nfs_get_option_ul(args, &option))
1312 goto out_invalid_value;
1313 mnt->acdirmax = option;
1314 break;
1315 case Opt_actimeo:
1316 if (nfs_get_option_ul(args, &option))
1317 goto out_invalid_value;
1318 mnt->acregmin = mnt->acregmax =
1319 mnt->acdirmin = mnt->acdirmax = option;
1320 break;
1321 case Opt_namelen:
1322 if (nfs_get_option_ul(args, &option))
1323 goto out_invalid_value;
1324 mnt->namlen = option;
1325 break;
1326 case Opt_mountport:
1327 if (nfs_get_option_ul(args, &option) ||
1328 option > USHRT_MAX)
1329 goto out_invalid_value;
1330 mnt->mount_server.port = option;
1331 break;
1332 case Opt_mountvers:
1333 if (nfs_get_option_ul(args, &option) ||
1334 option < NFS_MNT_VERSION ||
1335 option > NFS_MNT3_VERSION)
1336 goto out_invalid_value;
1337 mnt->mount_server.version = option;
1338 break;
1339 case Opt_minorversion:
1340 if (nfs_get_option_ul(args, &option))
1341 goto out_invalid_value;
1342 if (option > NFS4_MAX_MINOR_VERSION)
1343 goto out_invalid_value;
1344 mnt->minorversion = option;
1345 break;
1346
1347 /*
1348 * options that take text values
1349 */
1350 case Opt_nfsvers:
1351 string = match_strdup(args);
1352 if (string == NULL)
1353 goto out_nomem;
1354 rc = nfs_parse_version_string(string, mnt, args);
1355 kfree(string);
1356 if (!rc)
1357 goto out_invalid_value;
1358 break;
1359 case Opt_sec:
1360 string = match_strdup(args);
1361 if (string == NULL)
1362 goto out_nomem;
1363 rc = nfs_parse_security_flavors(string, mnt);
1364 kfree(string);
1365 if (!rc) {
1366 dfprintk(MOUNT, "NFS: unrecognized "
1367 "security flavor\n");
1368 return 0;
1369 }
1370 break;
1371 case Opt_proto:
1372 string = match_strdup(args);
1373 if (string == NULL)
1374 goto out_nomem;
1375 token = match_token(string,
1376 nfs_xprt_protocol_tokens, args);
1377
1378 protofamily = AF_INET;
1379 switch (token) {
1380 case Opt_xprt_udp6:
1381 protofamily = AF_INET6;
1382 case Opt_xprt_udp:
1383 mnt->flags &= ~NFS_MOUNT_TCP;
1384 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1385 break;
1386 case Opt_xprt_tcp6:
1387 protofamily = AF_INET6;
1388 case Opt_xprt_tcp:
1389 mnt->flags |= NFS_MOUNT_TCP;
1390 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1391 break;
1392 case Opt_xprt_rdma:
1393 /* vector side protocols to TCP */
1394 mnt->flags |= NFS_MOUNT_TCP;
1395 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1396 xprt_load_transport(string);
1397 break;
1398 default:
1399 dfprintk(MOUNT, "NFS: unrecognized "
1400 "transport protocol\n");
1401 kfree(string);
1402 return 0;
1403 }
1404 kfree(string);
1405 break;
1406 case Opt_mountproto:
1407 string = match_strdup(args);
1408 if (string == NULL)
1409 goto out_nomem;
1410 token = match_token(string,
1411 nfs_xprt_protocol_tokens, args);
1412 kfree(string);
1413
1414 mountfamily = AF_INET;
1415 switch (token) {
1416 case Opt_xprt_udp6:
1417 mountfamily = AF_INET6;
1418 case Opt_xprt_udp:
1419 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1420 break;
1421 case Opt_xprt_tcp6:
1422 mountfamily = AF_INET6;
1423 case Opt_xprt_tcp:
1424 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1425 break;
1426 case Opt_xprt_rdma: /* not used for side protocols */
1427 default:
1428 dfprintk(MOUNT, "NFS: unrecognized "
1429 "transport protocol\n");
1430 return 0;
1431 }
1432 break;
1433 case Opt_addr:
1434 string = match_strdup(args);
1435 if (string == NULL)
1436 goto out_nomem;
1437 mnt->nfs_server.addrlen =
1438 rpc_pton(mnt->net, string, strlen(string),
1439 (struct sockaddr *)
1440 &mnt->nfs_server.address,
1441 sizeof(mnt->nfs_server.address));
1442 kfree(string);
1443 if (mnt->nfs_server.addrlen == 0)
1444 goto out_invalid_address;
1445 break;
1446 case Opt_clientaddr:
1447 if (nfs_get_option_str(args, &mnt->client_address))
1448 goto out_nomem;
1449 break;
1450 case Opt_mounthost:
1451 if (nfs_get_option_str(args,
1452 &mnt->mount_server.hostname))
1453 goto out_nomem;
1454 break;
1455 case Opt_mountaddr:
1456 string = match_strdup(args);
1457 if (string == NULL)
1458 goto out_nomem;
1459 mnt->mount_server.addrlen =
1460 rpc_pton(mnt->net, string, strlen(string),
1461 (struct sockaddr *)
1462 &mnt->mount_server.address,
1463 sizeof(mnt->mount_server.address));
1464 kfree(string);
1465 if (mnt->mount_server.addrlen == 0)
1466 goto out_invalid_address;
1467 break;
1468 case Opt_lookupcache:
1469 string = match_strdup(args);
1470 if (string == NULL)
1471 goto out_nomem;
1472 token = match_token(string,
1473 nfs_lookupcache_tokens, args);
1474 kfree(string);
1475 switch (token) {
1476 case Opt_lookupcache_all:
1477 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1478 break;
1479 case Opt_lookupcache_positive:
1480 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1481 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1482 break;
1483 case Opt_lookupcache_none:
1484 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1485 break;
1486 default:
1487 dfprintk(MOUNT, "NFS: invalid "
1488 "lookupcache argument\n");
1489 return 0;
1490 };
1491 break;
1492 case Opt_fscache_uniq:
1493 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1494 goto out_nomem;
1495 mnt->options |= NFS_OPTION_FSCACHE;
1496 break;
1497 case Opt_local_lock:
1498 string = match_strdup(args);
1499 if (string == NULL)
1500 goto out_nomem;
1501 token = match_token(string, nfs_local_lock_tokens,
1502 args);
1503 kfree(string);
1504 switch (token) {
1505 case Opt_local_lock_all:
1506 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1507 NFS_MOUNT_LOCAL_FCNTL);
1508 break;
1509 case Opt_local_lock_flock:
1510 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1511 break;
1512 case Opt_local_lock_posix:
1513 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1514 break;
1515 case Opt_local_lock_none:
1516 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1517 NFS_MOUNT_LOCAL_FCNTL);
1518 break;
1519 default:
1520 dfprintk(MOUNT, "NFS: invalid "
1521 "local_lock argument\n");
1522 return 0;
1523 };
1524 break;
1525
1526 /*
1527 * Special options
1528 */
1529 case Opt_sloppy:
1530 sloppy = 1;
1531 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1532 break;
1533 case Opt_userspace:
1534 case Opt_deprecated:
1535 dfprintk(MOUNT, "NFS: ignoring mount option "
1536 "'%s'\n", p);
1537 break;
1538
1539 default:
1540 invalid_option = 1;
1541 dfprintk(MOUNT, "NFS: unrecognized mount option "
1542 "'%s'\n", p);
1543 }
1544 }
1545
1546 if (!sloppy && invalid_option)
1547 return 0;
1548
1549 if (mnt->minorversion && mnt->version != 4)
1550 goto out_minorversion_mismatch;
1551
1552 if (mnt->options & NFS_OPTION_MIGRATION &&
1553 mnt->version != 4 && mnt->minorversion != 0)
1554 goto out_migration_misuse;
1555
1556 /*
1557 * verify that any proto=/mountproto= options match the address
1558 * families in the addr=/mountaddr= options.
1559 */
1560 if (protofamily != AF_UNSPEC &&
1561 protofamily != mnt->nfs_server.address.ss_family)
1562 goto out_proto_mismatch;
1563
1564 if (mountfamily != AF_UNSPEC) {
1565 if (mnt->mount_server.addrlen) {
1566 if (mountfamily != mnt->mount_server.address.ss_family)
1567 goto out_mountproto_mismatch;
1568 } else {
1569 if (mountfamily != mnt->nfs_server.address.ss_family)
1570 goto out_mountproto_mismatch;
1571 }
1572 }
1573
1574 return 1;
1575
1576 out_mountproto_mismatch:
1577 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1578 "option\n");
1579 return 0;
1580 out_proto_mismatch:
1581 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1582 return 0;
1583 out_invalid_address:
1584 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1585 return 0;
1586 out_invalid_value:
1587 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1588 return 0;
1589 out_minorversion_mismatch:
1590 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1591 "minorversion=%u\n", mnt->version, mnt->minorversion);
1592 return 0;
1593 out_migration_misuse:
1594 printk(KERN_INFO
1595 "NFS: 'migration' not supported for this NFS version\n");
1596 return 0;
1597 out_nomem:
1598 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1599 return 0;
1600 out_security_failure:
1601 free_secdata(secdata);
1602 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1603 return 0;
1604 }
1605
1606 /*
1607 * Match the requested auth flavors with the list returned by
1608 * the server. Returns zero and sets the mount's authentication
1609 * flavor on success; returns -EACCES if server does not support
1610 * the requested flavor.
1611 */
1612 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1613 struct nfs_mount_request *request)
1614 {
1615 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1616
1617 /*
1618 * Certain releases of Linux's mountd return an empty
1619 * flavor list. To prevent behavioral regression with
1620 * these servers (ie. rejecting mounts that used to
1621 * succeed), revert to pre-2.6.32 behavior (no checking)
1622 * if the returned flavor list is empty.
1623 */
1624 if (server_authlist_len == 0)
1625 return 0;
1626
1627 /*
1628 * We avoid sophisticated negotiating here, as there are
1629 * plenty of cases where we can get it wrong, providing
1630 * either too little or too much security.
1631 *
1632 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1633 * flavor listed first. However, some servers list
1634 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1635 * preferred default, in args->auth_flavors[0] if user
1636 * didn't specify sec= mount option.
1637 */
1638 for (i = 0; i < args->auth_flavor_len; i++)
1639 for (j = 0; j < server_authlist_len; j++)
1640 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1641 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1642 request->auth_flavs[j]);
1643 args->auth_flavors[0] = request->auth_flavs[j];
1644 return 0;
1645 }
1646
1647 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1648 nfs_umount(request);
1649 return -EACCES;
1650 }
1651
1652 /*
1653 * Use the remote server's MOUNT service to request the NFS file handle
1654 * corresponding to the provided path.
1655 */
1656 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1657 struct nfs_fh *root_fh)
1658 {
1659 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1660 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1661 struct nfs_mount_request request = {
1662 .sap = (struct sockaddr *)
1663 &args->mount_server.address,
1664 .dirpath = args->nfs_server.export_path,
1665 .protocol = args->mount_server.protocol,
1666 .fh = root_fh,
1667 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1668 .auth_flav_len = &server_authlist_len,
1669 .auth_flavs = server_authlist,
1670 .net = args->net,
1671 };
1672 int status;
1673
1674 if (args->mount_server.version == 0) {
1675 switch (args->version) {
1676 default:
1677 args->mount_server.version = NFS_MNT3_VERSION;
1678 break;
1679 case 2:
1680 args->mount_server.version = NFS_MNT_VERSION;
1681 }
1682 }
1683 request.version = args->mount_server.version;
1684
1685 if (args->mount_server.hostname)
1686 request.hostname = args->mount_server.hostname;
1687 else
1688 request.hostname = args->nfs_server.hostname;
1689
1690 /*
1691 * Construct the mount server's address.
1692 */
1693 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1694 memcpy(request.sap, &args->nfs_server.address,
1695 args->nfs_server.addrlen);
1696 args->mount_server.addrlen = args->nfs_server.addrlen;
1697 }
1698 request.salen = args->mount_server.addrlen;
1699 nfs_set_port(request.sap, &args->mount_server.port, 0);
1700
1701 /*
1702 * Now ask the mount server to map our export path
1703 * to a file handle.
1704 */
1705 status = nfs_mount(&request);
1706 if (status != 0) {
1707 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1708 request.hostname, status);
1709 return status;
1710 }
1711
1712 /*
1713 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1714 */
1715 if (args->mount_server.version != NFS_MNT3_VERSION)
1716 return 0;
1717 return nfs_walk_authlist(args, &request);
1718 }
1719
1720 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1721 struct nfs_mount_info *mount_info,
1722 struct nfs_subversion *nfs_mod)
1723 {
1724 int status;
1725 struct nfs_server *server;
1726
1727 if (mount_info->parsed->need_mount) {
1728 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1729 if (status)
1730 return ERR_PTR(status);
1731 }
1732
1733 /* Get a volume representation */
1734 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1735 if (IS_ERR(server))
1736 return ERR_CAST(server);
1737
1738 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1739 }
1740 EXPORT_SYMBOL_GPL(nfs_try_mount);
1741
1742 /*
1743 * Split "dev_name" into "hostname:export_path".
1744 *
1745 * The leftmost colon demarks the split between the server's hostname
1746 * and the export path. If the hostname starts with a left square
1747 * bracket, then it may contain colons.
1748 *
1749 * Note: caller frees hostname and export path, even on error.
1750 */
1751 static int nfs_parse_devname(const char *dev_name,
1752 char **hostname, size_t maxnamlen,
1753 char **export_path, size_t maxpathlen)
1754 {
1755 size_t len;
1756 char *end;
1757
1758 /* Is the host name protected with square brakcets? */
1759 if (*dev_name == '[') {
1760 end = strchr(++dev_name, ']');
1761 if (end == NULL || end[1] != ':')
1762 goto out_bad_devname;
1763
1764 len = end - dev_name;
1765 end++;
1766 } else {
1767 char *comma;
1768
1769 end = strchr(dev_name, ':');
1770 if (end == NULL)
1771 goto out_bad_devname;
1772 len = end - dev_name;
1773
1774 /* kill possible hostname list: not supported */
1775 comma = strchr(dev_name, ',');
1776 if (comma != NULL && comma < end)
1777 *comma = 0;
1778 }
1779
1780 if (len > maxnamlen)
1781 goto out_hostname;
1782
1783 /* N.B. caller will free nfs_server.hostname in all cases */
1784 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1785 if (*hostname == NULL)
1786 goto out_nomem;
1787 len = strlen(++end);
1788 if (len > maxpathlen)
1789 goto out_path;
1790 *export_path = kstrndup(end, len, GFP_KERNEL);
1791 if (!*export_path)
1792 goto out_nomem;
1793
1794 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1795 return 0;
1796
1797 out_bad_devname:
1798 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1799 return -EINVAL;
1800
1801 out_nomem:
1802 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1803 return -ENOMEM;
1804
1805 out_hostname:
1806 dfprintk(MOUNT, "NFS: server hostname too long\n");
1807 return -ENAMETOOLONG;
1808
1809 out_path:
1810 dfprintk(MOUNT, "NFS: export pathname too long\n");
1811 return -ENAMETOOLONG;
1812 }
1813
1814 /*
1815 * Validate the NFS2/NFS3 mount data
1816 * - fills in the mount root filehandle
1817 *
1818 * For option strings, user space handles the following behaviors:
1819 *
1820 * + DNS: mapping server host name to IP address ("addr=" option)
1821 *
1822 * + failure mode: how to behave if a mount request can't be handled
1823 * immediately ("fg/bg" option)
1824 *
1825 * + retry: how often to retry a mount request ("retry=" option)
1826 *
1827 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1828 * mountproto=tcp after mountproto=udp, and so on
1829 */
1830 static int nfs23_validate_mount_data(void *options,
1831 struct nfs_parsed_mount_data *args,
1832 struct nfs_fh *mntfh,
1833 const char *dev_name)
1834 {
1835 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1836 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1837
1838 if (data == NULL)
1839 goto out_no_data;
1840
1841 args->version = NFS_DEFAULT_VERSION;
1842 switch (data->version) {
1843 case 1:
1844 data->namlen = 0;
1845 case 2:
1846 data->bsize = 0;
1847 case 3:
1848 if (data->flags & NFS_MOUNT_VER3)
1849 goto out_no_v3;
1850 data->root.size = NFS2_FHSIZE;
1851 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1852 case 4:
1853 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1854 goto out_no_sec;
1855 case 5:
1856 memset(data->context, 0, sizeof(data->context));
1857 case 6:
1858 if (data->flags & NFS_MOUNT_VER3) {
1859 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1860 goto out_invalid_fh;
1861 mntfh->size = data->root.size;
1862 args->version = 3;
1863 } else {
1864 mntfh->size = NFS2_FHSIZE;
1865 args->version = 2;
1866 }
1867
1868
1869 memcpy(mntfh->data, data->root.data, mntfh->size);
1870 if (mntfh->size < sizeof(mntfh->data))
1871 memset(mntfh->data + mntfh->size, 0,
1872 sizeof(mntfh->data) - mntfh->size);
1873
1874 /*
1875 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1876 * can deal with.
1877 */
1878 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1879 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1880 args->rsize = data->rsize;
1881 args->wsize = data->wsize;
1882 args->timeo = data->timeo;
1883 args->retrans = data->retrans;
1884 args->acregmin = data->acregmin;
1885 args->acregmax = data->acregmax;
1886 args->acdirmin = data->acdirmin;
1887 args->acdirmax = data->acdirmax;
1888 args->need_mount = false;
1889
1890 memcpy(sap, &data->addr, sizeof(data->addr));
1891 args->nfs_server.addrlen = sizeof(data->addr);
1892 args->nfs_server.port = ntohs(data->addr.sin_port);
1893 if (!nfs_verify_server_address(sap))
1894 goto out_no_address;
1895
1896 if (!(data->flags & NFS_MOUNT_TCP))
1897 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1898 /* N.B. caller will free nfs_server.hostname in all cases */
1899 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1900 args->namlen = data->namlen;
1901 args->bsize = data->bsize;
1902
1903 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1904 args->auth_flavors[0] = data->pseudoflavor;
1905 if (!args->nfs_server.hostname)
1906 goto out_nomem;
1907
1908 if (!(data->flags & NFS_MOUNT_NONLM))
1909 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1910 NFS_MOUNT_LOCAL_FCNTL);
1911 else
1912 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1913 NFS_MOUNT_LOCAL_FCNTL);
1914 /*
1915 * The legacy version 6 binary mount data from userspace has a
1916 * field used only to transport selinux information into the
1917 * the kernel. To continue to support that functionality we
1918 * have a touch of selinux knowledge here in the NFS code. The
1919 * userspace code converted context=blah to just blah so we are
1920 * converting back to the full string selinux understands.
1921 */
1922 if (data->context[0]){
1923 #ifdef CONFIG_SECURITY_SELINUX
1924 int rc;
1925 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1926 if (!opts_str)
1927 return -ENOMEM;
1928 strcpy(opts_str, "context=");
1929 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1930 strcat(opts_str, &data->context[0]);
1931 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1932 kfree(opts_str);
1933 if (rc)
1934 return rc;
1935 #else
1936 return -EINVAL;
1937 #endif
1938 }
1939
1940 break;
1941 default:
1942 return NFS_TEXT_DATA;
1943 }
1944
1945 #if !IS_ENABLED(CONFIG_NFS_V3)
1946 if (args->version == 3)
1947 goto out_v3_not_compiled;
1948 #endif /* !CONFIG_NFS_V3 */
1949
1950 return 0;
1951
1952 out_no_data:
1953 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1954 return -EINVAL;
1955
1956 out_no_v3:
1957 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1958 data->version);
1959 return -EINVAL;
1960
1961 out_no_sec:
1962 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1963 return -EINVAL;
1964
1965 #if !IS_ENABLED(CONFIG_NFS_V3)
1966 out_v3_not_compiled:
1967 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1968 return -EPROTONOSUPPORT;
1969 #endif /* !CONFIG_NFS_V3 */
1970
1971 out_nomem:
1972 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1973 return -ENOMEM;
1974
1975 out_no_address:
1976 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1977 return -EINVAL;
1978
1979 out_invalid_fh:
1980 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1981 return -EINVAL;
1982 }
1983
1984 #if IS_ENABLED(CONFIG_NFS_V4)
1985 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1986 void *options,
1987 struct nfs_parsed_mount_data *args,
1988 struct nfs_fh *mntfh,
1989 const char *dev_name)
1990 {
1991 if (fs_type == &nfs_fs_type)
1992 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1993 return nfs4_validate_mount_data(options, args, dev_name);
1994 }
1995 #else
1996 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1997 void *options,
1998 struct nfs_parsed_mount_data *args,
1999 struct nfs_fh *mntfh,
2000 const char *dev_name)
2001 {
2002 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2003 }
2004 #endif
2005
2006 static int nfs_validate_text_mount_data(void *options,
2007 struct nfs_parsed_mount_data *args,
2008 const char *dev_name)
2009 {
2010 int port = 0;
2011 int max_namelen = PAGE_SIZE;
2012 int max_pathlen = NFS_MAXPATHLEN;
2013 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2014
2015 if (nfs_parse_mount_options((char *)options, args) == 0)
2016 return -EINVAL;
2017
2018 if (!nfs_verify_server_address(sap))
2019 goto out_no_address;
2020
2021 if (args->version == 4) {
2022 #if IS_ENABLED(CONFIG_NFS_V4)
2023 port = NFS_PORT;
2024 max_namelen = NFS4_MAXNAMLEN;
2025 max_pathlen = NFS4_MAXPATHLEN;
2026 nfs_validate_transport_protocol(args);
2027 nfs4_validate_mount_flags(args);
2028 #else
2029 goto out_v4_not_compiled;
2030 #endif /* CONFIG_NFS_V4 */
2031 } else
2032 nfs_set_mount_transport_protocol(args);
2033
2034 nfs_set_port(sap, &args->nfs_server.port, port);
2035
2036 if (args->auth_flavor_len > 1)
2037 goto out_bad_auth;
2038
2039 return nfs_parse_devname(dev_name,
2040 &args->nfs_server.hostname,
2041 max_namelen,
2042 &args->nfs_server.export_path,
2043 max_pathlen);
2044
2045 #if !IS_ENABLED(CONFIG_NFS_V4)
2046 out_v4_not_compiled:
2047 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2048 return -EPROTONOSUPPORT;
2049 #endif /* !CONFIG_NFS_V4 */
2050
2051 out_no_address:
2052 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2053 return -EINVAL;
2054
2055 out_bad_auth:
2056 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2057 return -EINVAL;
2058 }
2059
2060 static int
2061 nfs_compare_remount_data(struct nfs_server *nfss,
2062 struct nfs_parsed_mount_data *data)
2063 {
2064 if (data->flags != nfss->flags ||
2065 data->rsize != nfss->rsize ||
2066 data->wsize != nfss->wsize ||
2067 data->retrans != nfss->client->cl_timeout->to_retries ||
2068 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2069 data->acregmin != nfss->acregmin / HZ ||
2070 data->acregmax != nfss->acregmax / HZ ||
2071 data->acdirmin != nfss->acdirmin / HZ ||
2072 data->acdirmax != nfss->acdirmax / HZ ||
2073 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2074 data->nfs_server.port != nfss->port ||
2075 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2076 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2077 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2078 return -EINVAL;
2079
2080 return 0;
2081 }
2082
2083 int
2084 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2085 {
2086 int error;
2087 struct nfs_server *nfss = sb->s_fs_info;
2088 struct nfs_parsed_mount_data *data;
2089 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2090 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2091 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2092
2093 /*
2094 * Userspace mount programs that send binary options generally send
2095 * them populated with default values. We have no way to know which
2096 * ones were explicitly specified. Fall back to legacy behavior and
2097 * just return success.
2098 */
2099 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2100 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2101 options->version <= 6))))
2102 return 0;
2103
2104 data = kzalloc(sizeof(*data), GFP_KERNEL);
2105 if (data == NULL)
2106 return -ENOMEM;
2107
2108 /* fill out struct with values from existing mount */
2109 data->flags = nfss->flags;
2110 data->rsize = nfss->rsize;
2111 data->wsize = nfss->wsize;
2112 data->retrans = nfss->client->cl_timeout->to_retries;
2113 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2114 data->acregmin = nfss->acregmin / HZ;
2115 data->acregmax = nfss->acregmax / HZ;
2116 data->acdirmin = nfss->acdirmin / HZ;
2117 data->acdirmax = nfss->acdirmax / HZ;
2118 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2119 data->nfs_server.port = nfss->port;
2120 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2121 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2122 data->nfs_server.addrlen);
2123
2124 /* overwrite those values with any that were specified */
2125 error = nfs_parse_mount_options((char *)options, data);
2126 if (error < 0)
2127 goto out;
2128
2129 /*
2130 * noac is a special case. It implies -o sync, but that's not
2131 * necessarily reflected in the mtab options. do_remount_sb
2132 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2133 * remount options, so we have to explicitly reset it.
2134 */
2135 if (data->flags & NFS_MOUNT_NOAC)
2136 *flags |= MS_SYNCHRONOUS;
2137
2138 /* compare new mount options with old ones */
2139 error = nfs_compare_remount_data(nfss, data);
2140 out:
2141 kfree(data);
2142 return error;
2143 }
2144 EXPORT_SYMBOL_GPL(nfs_remount);
2145
2146 /*
2147 * Initialise the common bits of the superblock
2148 */
2149 inline void nfs_initialise_sb(struct super_block *sb)
2150 {
2151 struct nfs_server *server = NFS_SB(sb);
2152
2153 sb->s_magic = NFS_SUPER_MAGIC;
2154
2155 /* We probably want something more informative here */
2156 snprintf(sb->s_id, sizeof(sb->s_id),
2157 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2158
2159 if (sb->s_blocksize == 0)
2160 sb->s_blocksize = nfs_block_bits(server->wsize,
2161 &sb->s_blocksize_bits);
2162
2163 sb->s_bdi = &server->backing_dev_info;
2164
2165 nfs_super_set_maxbytes(sb, server->maxfilesize);
2166 }
2167
2168 /*
2169 * Finish setting up an NFS2/3 superblock
2170 */
2171 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2172 {
2173 struct nfs_parsed_mount_data *data = mount_info->parsed;
2174 struct nfs_server *server = NFS_SB(sb);
2175
2176 sb->s_blocksize_bits = 0;
2177 sb->s_blocksize = 0;
2178 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2179 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2180 if (data && data->bsize)
2181 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2182
2183 if (server->nfs_client->rpc_ops->version != 2) {
2184 /* The VFS shouldn't apply the umask to mode bits. We will do
2185 * so ourselves when necessary.
2186 */
2187 sb->s_flags |= MS_POSIXACL;
2188 sb->s_time_gran = 1;
2189 }
2190
2191 nfs_initialise_sb(sb);
2192 }
2193 EXPORT_SYMBOL_GPL(nfs_fill_super);
2194
2195 /*
2196 * Finish setting up a cloned NFS2/3/4 superblock
2197 */
2198 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2199 {
2200 const struct super_block *old_sb = mount_info->cloned->sb;
2201 struct nfs_server *server = NFS_SB(sb);
2202
2203 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2204 sb->s_blocksize = old_sb->s_blocksize;
2205 sb->s_maxbytes = old_sb->s_maxbytes;
2206 sb->s_xattr = old_sb->s_xattr;
2207 sb->s_op = old_sb->s_op;
2208 sb->s_time_gran = 1;
2209
2210 if (server->nfs_client->rpc_ops->version != 2) {
2211 /* The VFS shouldn't apply the umask to mode bits. We will do
2212 * so ourselves when necessary.
2213 */
2214 sb->s_flags |= MS_POSIXACL;
2215 }
2216
2217 nfs_initialise_sb(sb);
2218 }
2219
2220 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2221 {
2222 const struct nfs_server *a = s->s_fs_info;
2223 const struct rpc_clnt *clnt_a = a->client;
2224 const struct rpc_clnt *clnt_b = b->client;
2225
2226 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2227 goto Ebusy;
2228 if (a->nfs_client != b->nfs_client)
2229 goto Ebusy;
2230 if (a->flags != b->flags)
2231 goto Ebusy;
2232 if (a->wsize != b->wsize)
2233 goto Ebusy;
2234 if (a->rsize != b->rsize)
2235 goto Ebusy;
2236 if (a->acregmin != b->acregmin)
2237 goto Ebusy;
2238 if (a->acregmax != b->acregmax)
2239 goto Ebusy;
2240 if (a->acdirmin != b->acdirmin)
2241 goto Ebusy;
2242 if (a->acdirmax != b->acdirmax)
2243 goto Ebusy;
2244 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2245 goto Ebusy;
2246 return 1;
2247 Ebusy:
2248 return 0;
2249 }
2250
2251 struct nfs_sb_mountdata {
2252 struct nfs_server *server;
2253 int mntflags;
2254 };
2255
2256 static int nfs_set_super(struct super_block *s, void *data)
2257 {
2258 struct nfs_sb_mountdata *sb_mntdata = data;
2259 struct nfs_server *server = sb_mntdata->server;
2260 int ret;
2261
2262 s->s_flags = sb_mntdata->mntflags;
2263 s->s_fs_info = server;
2264 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2265 ret = set_anon_super(s, server);
2266 if (ret == 0)
2267 server->s_dev = s->s_dev;
2268 return ret;
2269 }
2270
2271 static int nfs_compare_super_address(struct nfs_server *server1,
2272 struct nfs_server *server2)
2273 {
2274 struct sockaddr *sap1, *sap2;
2275
2276 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2277 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2278
2279 if (sap1->sa_family != sap2->sa_family)
2280 return 0;
2281
2282 switch (sap1->sa_family) {
2283 case AF_INET: {
2284 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2285 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2286 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2287 return 0;
2288 if (sin1->sin_port != sin2->sin_port)
2289 return 0;
2290 break;
2291 }
2292 case AF_INET6: {
2293 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2294 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2295 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2296 return 0;
2297 if (sin1->sin6_port != sin2->sin6_port)
2298 return 0;
2299 break;
2300 }
2301 default:
2302 return 0;
2303 }
2304
2305 return 1;
2306 }
2307
2308 static int nfs_compare_super(struct super_block *sb, void *data)
2309 {
2310 struct nfs_sb_mountdata *sb_mntdata = data;
2311 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2312 int mntflags = sb_mntdata->mntflags;
2313
2314 if (!nfs_compare_super_address(old, server))
2315 return 0;
2316 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2317 if (old->flags & NFS_MOUNT_UNSHARED)
2318 return 0;
2319 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2320 return 0;
2321 return nfs_compare_mount_options(sb, server, mntflags);
2322 }
2323
2324 #ifdef CONFIG_NFS_FSCACHE
2325 static void nfs_get_cache_cookie(struct super_block *sb,
2326 struct nfs_parsed_mount_data *parsed,
2327 struct nfs_clone_mount *cloned)
2328 {
2329 struct nfs_server *nfss = NFS_SB(sb);
2330 char *uniq = NULL;
2331 int ulen = 0;
2332
2333 nfss->fscache_key = NULL;
2334 nfss->fscache = NULL;
2335
2336 if (parsed) {
2337 if (!(parsed->options & NFS_OPTION_FSCACHE))
2338 return;
2339 if (parsed->fscache_uniq) {
2340 uniq = parsed->fscache_uniq;
2341 ulen = strlen(parsed->fscache_uniq);
2342 }
2343 } else if (cloned) {
2344 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2345 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2346 return;
2347 if (mnt_s->fscache_key) {
2348 uniq = mnt_s->fscache_key->key.uniquifier;
2349 ulen = mnt_s->fscache_key->key.uniq_len;
2350 };
2351 } else
2352 return;
2353
2354 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2355 }
2356 #else
2357 static void nfs_get_cache_cookie(struct super_block *sb,
2358 struct nfs_parsed_mount_data *parsed,
2359 struct nfs_clone_mount *cloned)
2360 {
2361 }
2362 #endif
2363
2364 static int nfs_bdi_register(struct nfs_server *server)
2365 {
2366 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2367 }
2368
2369 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2370 struct nfs_mount_info *mount_info)
2371 {
2372 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2373 }
2374 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2375
2376 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2377 struct nfs_mount_info *mount_info)
2378 {
2379 /* clone any lsm security options from the parent to the new sb */
2380 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2381 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2382 return -ESTALE;
2383 return 0;
2384 }
2385 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2386
2387 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2388 int flags, const char *dev_name,
2389 struct nfs_mount_info *mount_info,
2390 struct nfs_subversion *nfs_mod)
2391 {
2392 struct super_block *s;
2393 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2394 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2395 struct nfs_sb_mountdata sb_mntdata = {
2396 .mntflags = flags,
2397 .server = server,
2398 };
2399 int error;
2400
2401 if (server->flags & NFS_MOUNT_UNSHARED)
2402 compare_super = NULL;
2403
2404 /* -o noac implies -o sync */
2405 if (server->flags & NFS_MOUNT_NOAC)
2406 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2407
2408 /* Get a superblock - note that we may end up sharing one that already exists */
2409 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2410 if (IS_ERR(s)) {
2411 mntroot = ERR_CAST(s);
2412 goto out_err_nosb;
2413 }
2414
2415 if (s->s_fs_info != server) {
2416 nfs_free_server(server);
2417 server = NULL;
2418 } else {
2419 error = nfs_bdi_register(server);
2420 if (error) {
2421 mntroot = ERR_PTR(error);
2422 goto error_splat_bdi;
2423 }
2424 }
2425
2426 if (!s->s_root) {
2427 /* initial superblock/root creation */
2428 mount_info->fill_super(s, mount_info);
2429 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2430 }
2431
2432 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2433 if (IS_ERR(mntroot))
2434 goto error_splat_super;
2435
2436 error = mount_info->set_security(s, mntroot, mount_info);
2437 if (error)
2438 goto error_splat_root;
2439
2440 s->s_flags |= MS_ACTIVE;
2441
2442 out:
2443 return mntroot;
2444
2445 out_err_nosb:
2446 nfs_free_server(server);
2447 goto out;
2448
2449 error_splat_root:
2450 dput(mntroot);
2451 mntroot = ERR_PTR(error);
2452 error_splat_super:
2453 if (server && !s->s_root)
2454 bdi_unregister(&server->backing_dev_info);
2455 error_splat_bdi:
2456 deactivate_locked_super(s);
2457 goto out;
2458 }
2459 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2460
2461 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2462 int flags, const char *dev_name, void *raw_data)
2463 {
2464 struct nfs_mount_info mount_info = {
2465 .fill_super = nfs_fill_super,
2466 .set_security = nfs_set_sb_security,
2467 };
2468 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2469 struct nfs_subversion *nfs_mod;
2470 int error;
2471
2472 mount_info.parsed = nfs_alloc_parsed_mount_data();
2473 mount_info.mntfh = nfs_alloc_fhandle();
2474 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2475 goto out;
2476
2477 /* Validate the mount data */
2478 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2479 if (error == NFS_TEXT_DATA)
2480 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2481 if (error < 0) {
2482 mntroot = ERR_PTR(error);
2483 goto out;
2484 }
2485
2486 nfs_mod = get_nfs_version(mount_info.parsed->version);
2487 if (IS_ERR(nfs_mod)) {
2488 mntroot = ERR_CAST(nfs_mod);
2489 goto out;
2490 }
2491
2492 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2493
2494 put_nfs_version(nfs_mod);
2495 out:
2496 nfs_free_parsed_mount_data(mount_info.parsed);
2497 nfs_free_fhandle(mount_info.mntfh);
2498 return mntroot;
2499 }
2500 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2501
2502 /*
2503 * Ensure that we unregister the bdi before kill_anon_super
2504 * releases the device name
2505 */
2506 void nfs_put_super(struct super_block *s)
2507 {
2508 struct nfs_server *server = NFS_SB(s);
2509
2510 bdi_unregister(&server->backing_dev_info);
2511 }
2512 EXPORT_SYMBOL_GPL(nfs_put_super);
2513
2514 /*
2515 * Destroy an NFS2/3 superblock
2516 */
2517 void nfs_kill_super(struct super_block *s)
2518 {
2519 struct nfs_server *server = NFS_SB(s);
2520
2521 kill_anon_super(s);
2522 nfs_fscache_release_super_cookie(s);
2523 nfs_free_server(server);
2524 }
2525 EXPORT_SYMBOL_GPL(nfs_kill_super);
2526
2527 /*
2528 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2529 */
2530 static struct dentry *
2531 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2532 const char *dev_name, void *raw_data)
2533 {
2534 struct nfs_clone_mount *data = raw_data;
2535 struct nfs_mount_info mount_info = {
2536 .fill_super = nfs_clone_super,
2537 .set_security = nfs_clone_sb_security,
2538 .cloned = data,
2539 };
2540 struct nfs_server *server;
2541 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2542 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2543
2544 dprintk("--> nfs_xdev_mount()\n");
2545
2546 mount_info.mntfh = mount_info.cloned->fh;
2547
2548 /* create a new volume representation */
2549 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2550
2551 if (IS_ERR(server))
2552 mntroot = ERR_CAST(server);
2553 else
2554 mntroot = nfs_fs_mount_common(server, flags,
2555 dev_name, &mount_info, nfs_mod);
2556
2557 dprintk("<-- nfs_xdev_mount() = %ld\n",
2558 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2559 return mntroot;
2560 }
2561
2562 #if IS_ENABLED(CONFIG_NFS_V4)
2563
2564 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2565 {
2566 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2567 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2568 }
2569
2570 /*
2571 * Validate NFSv4 mount options
2572 */
2573 static int nfs4_validate_mount_data(void *options,
2574 struct nfs_parsed_mount_data *args,
2575 const char *dev_name)
2576 {
2577 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2578 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2579 char *c;
2580
2581 if (data == NULL)
2582 goto out_no_data;
2583
2584 args->version = 4;
2585
2586 switch (data->version) {
2587 case 1:
2588 if (data->host_addrlen > sizeof(args->nfs_server.address))
2589 goto out_no_address;
2590 if (data->host_addrlen == 0)
2591 goto out_no_address;
2592 args->nfs_server.addrlen = data->host_addrlen;
2593 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2594 return -EFAULT;
2595 if (!nfs_verify_server_address(sap))
2596 goto out_no_address;
2597 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2598
2599 if (data->auth_flavourlen) {
2600 if (data->auth_flavourlen > 1)
2601 goto out_inval_auth;
2602 if (copy_from_user(&args->auth_flavors[0],
2603 data->auth_flavours,
2604 sizeof(args->auth_flavors[0])))
2605 return -EFAULT;
2606 }
2607
2608 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2609 if (IS_ERR(c))
2610 return PTR_ERR(c);
2611 args->nfs_server.hostname = c;
2612
2613 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2614 if (IS_ERR(c))
2615 return PTR_ERR(c);
2616 args->nfs_server.export_path = c;
2617 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2618
2619 c = strndup_user(data->client_addr.data, 16);
2620 if (IS_ERR(c))
2621 return PTR_ERR(c);
2622 args->client_address = c;
2623
2624 /*
2625 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2626 * can deal with.
2627 */
2628
2629 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2630 args->rsize = data->rsize;
2631 args->wsize = data->wsize;
2632 args->timeo = data->timeo;
2633 args->retrans = data->retrans;
2634 args->acregmin = data->acregmin;
2635 args->acregmax = data->acregmax;
2636 args->acdirmin = data->acdirmin;
2637 args->acdirmax = data->acdirmax;
2638 args->nfs_server.protocol = data->proto;
2639 nfs_validate_transport_protocol(args);
2640
2641 break;
2642 default:
2643 return NFS_TEXT_DATA;
2644 }
2645
2646 return 0;
2647
2648 out_no_data:
2649 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2650 return -EINVAL;
2651
2652 out_inval_auth:
2653 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2654 data->auth_flavourlen);
2655 return -EINVAL;
2656
2657 out_no_address:
2658 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2659 return -EINVAL;
2660 }
2661
2662 /*
2663 * NFS v4 module parameters need to stay in the
2664 * NFS client for backwards compatibility
2665 */
2666 unsigned int nfs_callback_set_tcpport;
2667 unsigned short nfs_callback_tcpport;
2668 /* Default cache timeout is 10 minutes */
2669 unsigned int nfs_idmap_cache_timeout = 600;
2670 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2671 bool nfs4_disable_idmapping = true;
2672 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2673 unsigned short send_implementation_id = 1;
2674 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2675
2676 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2677 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2678 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2679 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2680 EXPORT_SYMBOL_GPL(max_session_slots);
2681 EXPORT_SYMBOL_GPL(send_implementation_id);
2682 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2683
2684 #define NFS_CALLBACK_MAXPORTNR (65535U)
2685
2686 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2687 {
2688 unsigned long num;
2689 int ret;
2690
2691 if (!val)
2692 return -EINVAL;
2693 ret = kstrtoul(val, 0, &num);
2694 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2695 return -EINVAL;
2696 *((unsigned int *)kp->arg) = num;
2697 return 0;
2698 }
2699 static struct kernel_param_ops param_ops_portnr = {
2700 .set = param_set_portnr,
2701 .get = param_get_uint,
2702 };
2703 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2704
2705 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2706 module_param(nfs_idmap_cache_timeout, int, 0644);
2707 module_param(nfs4_disable_idmapping, bool, 0644);
2708 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2709 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2710 MODULE_PARM_DESC(nfs4_disable_idmapping,
2711 "Turn off NFSv4 idmapping when using 'sec=sys'");
2712 module_param(max_session_slots, ushort, 0644);
2713 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2714 "requests the client will negotiate");
2715 module_param(send_implementation_id, ushort, 0644);
2716 MODULE_PARM_DESC(send_implementation_id,
2717 "Send implementation ID with NFSv4.1 exchange_id");
2718 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2719 MODULE_ALIAS("nfs4");
2720
2721 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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