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Merge tag 'nfs-for-3.10-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
[mirror_ubuntu-artful-kernel.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/addr.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/sunrpc/xprtsock.h>
38 #include <linux/sunrpc/xprtrdma.h>
39 #include <linux/nfs_fs.h>
40 #include <linux/nfs_mount.h>
41 #include <linux/nfs4_mount.h>
42 #include <linux/lockd/bind.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56 #include <linux/nsproxy.h>
57 #include <linux/rcupdate.h>
58
59 #include <asm/uaccess.h>
60
61 #include "nfs4_fs.h"
62 #include "callback.h"
63 #include "delegation.h"
64 #include "iostat.h"
65 #include "internal.h"
66 #include "fscache.h"
67 #include "nfs4session.h"
68 #include "pnfs.h"
69 #include "nfs.h"
70
71 #define NFSDBG_FACILITY NFSDBG_VFS
72 #define NFS_TEXT_DATA 1
73
74 #if IS_ENABLED(CONFIG_NFS_V3)
75 #define NFS_DEFAULT_VERSION 3
76 #else
77 #define NFS_DEFAULT_VERSION 2
78 #endif
79
80 enum {
81 /* Mount options that take no arguments */
82 Opt_soft, Opt_hard,
83 Opt_posix, Opt_noposix,
84 Opt_cto, Opt_nocto,
85 Opt_ac, Opt_noac,
86 Opt_lock, Opt_nolock,
87 Opt_udp, Opt_tcp, Opt_rdma,
88 Opt_acl, Opt_noacl,
89 Opt_rdirplus, Opt_nordirplus,
90 Opt_sharecache, Opt_nosharecache,
91 Opt_resvport, Opt_noresvport,
92 Opt_fscache, Opt_nofscache,
93 Opt_migration, Opt_nomigration,
94
95 /* Mount options that take integer arguments */
96 Opt_port,
97 Opt_rsize, Opt_wsize, Opt_bsize,
98 Opt_timeo, Opt_retrans,
99 Opt_acregmin, Opt_acregmax,
100 Opt_acdirmin, Opt_acdirmax,
101 Opt_actimeo,
102 Opt_namelen,
103 Opt_mountport,
104 Opt_mountvers,
105 Opt_minorversion,
106
107 /* Mount options that take string arguments */
108 Opt_nfsvers,
109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
111 Opt_lookupcache,
112 Opt_fscache_uniq,
113 Opt_local_lock,
114
115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
117
118 Opt_err
119 };
120
121 static const match_table_t nfs_mount_option_tokens = {
122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
124 { Opt_userspace, "retry=%s" },
125
126 { Opt_sloppy, "sloppy" },
127
128 { Opt_soft, "soft" },
129 { Opt_hard, "hard" },
130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
132 { Opt_posix, "posix" },
133 { Opt_noposix, "noposix" },
134 { Opt_cto, "cto" },
135 { Opt_nocto, "nocto" },
136 { Opt_ac, "ac" },
137 { Opt_noac, "noac" },
138 { Opt_lock, "lock" },
139 { Opt_nolock, "nolock" },
140 { Opt_udp, "udp" },
141 { Opt_tcp, "tcp" },
142 { Opt_rdma, "rdma" },
143 { Opt_acl, "acl" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
151 { Opt_fscache, "fsc" },
152 { Opt_nofscache, "nofsc" },
153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
155
156 { Opt_port, "port=%s" },
157 { Opt_rsize, "rsize=%s" },
158 { Opt_wsize, "wsize=%s" },
159 { Opt_bsize, "bsize=%s" },
160 { Opt_timeo, "timeo=%s" },
161 { Opt_retrans, "retrans=%s" },
162 { Opt_acregmin, "acregmin=%s" },
163 { Opt_acregmax, "acregmax=%s" },
164 { Opt_acdirmin, "acdirmin=%s" },
165 { Opt_acdirmax, "acdirmax=%s" },
166 { Opt_actimeo, "actimeo=%s" },
167 { Opt_namelen, "namlen=%s" },
168 { Opt_mountport, "mountport=%s" },
169 { Opt_mountvers, "mountvers=%s" },
170 { Opt_minorversion, "minorversion=%s" },
171
172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
174
175 { Opt_sec, "sec=%s" },
176 { Opt_proto, "proto=%s" },
177 { Opt_mountproto, "mountproto=%s" },
178 { Opt_addr, "addr=%s" },
179 { Opt_clientaddr, "clientaddr=%s" },
180 { Opt_mounthost, "mounthost=%s" },
181 { Opt_mountaddr, "mountaddr=%s" },
182
183 { Opt_lookupcache, "lookupcache=%s" },
184 { Opt_fscache_uniq, "fsc=%s" },
185 { Opt_local_lock, "local_lock=%s" },
186
187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
189
190 { Opt_err, NULL }
191 };
192
193 enum {
194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
195
196 Opt_xprt_err
197 };
198
199 static const match_table_t nfs_xprt_protocol_tokens = {
200 { Opt_xprt_udp, "udp" },
201 { Opt_xprt_udp6, "udp6" },
202 { Opt_xprt_tcp, "tcp" },
203 { Opt_xprt_tcp6, "tcp6" },
204 { Opt_xprt_rdma, "rdma" },
205
206 { Opt_xprt_err, NULL }
207 };
208
209 enum {
210 Opt_sec_none, Opt_sec_sys,
211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
214
215 Opt_sec_err
216 };
217
218 static const match_table_t nfs_secflavor_tokens = {
219 { Opt_sec_none, "none" },
220 { Opt_sec_none, "null" },
221 { Opt_sec_sys, "sys" },
222
223 { Opt_sec_krb5, "krb5" },
224 { Opt_sec_krb5i, "krb5i" },
225 { Opt_sec_krb5p, "krb5p" },
226
227 { Opt_sec_lkey, "lkey" },
228 { Opt_sec_lkeyi, "lkeyi" },
229 { Opt_sec_lkeyp, "lkeyp" },
230
231 { Opt_sec_spkm, "spkm3" },
232 { Opt_sec_spkmi, "spkm3i" },
233 { Opt_sec_spkmp, "spkm3p" },
234
235 { Opt_sec_err, NULL }
236 };
237
238 enum {
239 Opt_lookupcache_all, Opt_lookupcache_positive,
240 Opt_lookupcache_none,
241
242 Opt_lookupcache_err
243 };
244
245 static match_table_t nfs_lookupcache_tokens = {
246 { Opt_lookupcache_all, "all" },
247 { Opt_lookupcache_positive, "pos" },
248 { Opt_lookupcache_positive, "positive" },
249 { Opt_lookupcache_none, "none" },
250
251 { Opt_lookupcache_err, NULL }
252 };
253
254 enum {
255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
256 Opt_local_lock_none,
257
258 Opt_local_lock_err
259 };
260
261 static match_table_t nfs_local_lock_tokens = {
262 { Opt_local_lock_all, "all" },
263 { Opt_local_lock_flock, "flock" },
264 { Opt_local_lock_posix, "posix" },
265 { Opt_local_lock_none, "none" },
266
267 { Opt_local_lock_err, NULL }
268 };
269
270 enum {
271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272 Opt_vers_4_1,
273
274 Opt_vers_err
275 };
276
277 static match_table_t nfs_vers_tokens = {
278 { Opt_vers_2, "2" },
279 { Opt_vers_3, "3" },
280 { Opt_vers_4, "4" },
281 { Opt_vers_4_0, "4.0" },
282 { Opt_vers_4_1, "4.1" },
283
284 { Opt_vers_err, NULL }
285 };
286
287 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data);
289
290 struct file_system_type nfs_fs_type = {
291 .owner = THIS_MODULE,
292 .name = "nfs",
293 .mount = nfs_fs_mount,
294 .kill_sb = nfs_kill_super,
295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
296 };
297 MODULE_ALIAS_FS("nfs");
298 EXPORT_SYMBOL_GPL(nfs_fs_type);
299
300 struct file_system_type nfs_xdev_fs_type = {
301 .owner = THIS_MODULE,
302 .name = "nfs",
303 .mount = nfs_xdev_mount,
304 .kill_sb = nfs_kill_super,
305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
306 };
307
308 const struct super_operations nfs_sops = {
309 .alloc_inode = nfs_alloc_inode,
310 .destroy_inode = nfs_destroy_inode,
311 .write_inode = nfs_write_inode,
312 .drop_inode = nfs_drop_inode,
313 .put_super = nfs_put_super,
314 .statfs = nfs_statfs,
315 .evict_inode = nfs_evict_inode,
316 .umount_begin = nfs_umount_begin,
317 .show_options = nfs_show_options,
318 .show_devname = nfs_show_devname,
319 .show_path = nfs_show_path,
320 .show_stats = nfs_show_stats,
321 .remount_fs = nfs_remount,
322 };
323 EXPORT_SYMBOL_GPL(nfs_sops);
324
325 #if IS_ENABLED(CONFIG_NFS_V4)
326 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
327 static int nfs4_validate_mount_data(void *options,
328 struct nfs_parsed_mount_data *args, const char *dev_name);
329
330 struct file_system_type nfs4_fs_type = {
331 .owner = THIS_MODULE,
332 .name = "nfs4",
333 .mount = nfs_fs_mount,
334 .kill_sb = nfs_kill_super,
335 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
336 };
337 MODULE_ALIAS_FS("nfs4");
338 MODULE_ALIAS("nfs4");
339 EXPORT_SYMBOL_GPL(nfs4_fs_type);
340
341 static int __init register_nfs4_fs(void)
342 {
343 return register_filesystem(&nfs4_fs_type);
344 }
345
346 static void unregister_nfs4_fs(void)
347 {
348 unregister_filesystem(&nfs4_fs_type);
349 }
350 #else
351 static int __init register_nfs4_fs(void)
352 {
353 return 0;
354 }
355
356 static void unregister_nfs4_fs(void)
357 {
358 }
359 #endif
360
361 static struct shrinker acl_shrinker = {
362 .shrink = nfs_access_cache_shrinker,
363 .seeks = DEFAULT_SEEKS,
364 };
365
366 /*
367 * Register the NFS filesystems
368 */
369 int __init register_nfs_fs(void)
370 {
371 int ret;
372
373 ret = register_filesystem(&nfs_fs_type);
374 if (ret < 0)
375 goto error_0;
376
377 ret = register_nfs4_fs();
378 if (ret < 0)
379 goto error_1;
380
381 ret = nfs_register_sysctl();
382 if (ret < 0)
383 goto error_2;
384 register_shrinker(&acl_shrinker);
385 return 0;
386
387 error_2:
388 unregister_nfs4_fs();
389 error_1:
390 unregister_filesystem(&nfs_fs_type);
391 error_0:
392 return ret;
393 }
394
395 /*
396 * Unregister the NFS filesystems
397 */
398 void __exit unregister_nfs_fs(void)
399 {
400 unregister_shrinker(&acl_shrinker);
401 nfs_unregister_sysctl();
402 unregister_nfs4_fs();
403 unregister_filesystem(&nfs_fs_type);
404 }
405
406 void nfs_sb_active(struct super_block *sb)
407 {
408 struct nfs_server *server = NFS_SB(sb);
409
410 if (atomic_inc_return(&server->active) == 1)
411 atomic_inc(&sb->s_active);
412 }
413 EXPORT_SYMBOL_GPL(nfs_sb_active);
414
415 void nfs_sb_deactive(struct super_block *sb)
416 {
417 struct nfs_server *server = NFS_SB(sb);
418
419 if (atomic_dec_and_test(&server->active))
420 deactivate_super(sb);
421 }
422 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
423
424 /*
425 * Deliver file system statistics to userspace
426 */
427 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
428 {
429 struct nfs_server *server = NFS_SB(dentry->d_sb);
430 unsigned char blockbits;
431 unsigned long blockres;
432 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
433 struct nfs_fsstat res;
434 int error = -ENOMEM;
435
436 res.fattr = nfs_alloc_fattr();
437 if (res.fattr == NULL)
438 goto out_err;
439
440 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
441 if (unlikely(error == -ESTALE)) {
442 struct dentry *pd_dentry;
443
444 pd_dentry = dget_parent(dentry);
445 if (pd_dentry != NULL) {
446 nfs_zap_caches(pd_dentry->d_inode);
447 dput(pd_dentry);
448 }
449 }
450 nfs_free_fattr(res.fattr);
451 if (error < 0)
452 goto out_err;
453
454 buf->f_type = NFS_SUPER_MAGIC;
455
456 /*
457 * Current versions of glibc do not correctly handle the
458 * case where f_frsize != f_bsize. Eventually we want to
459 * report the value of wtmult in this field.
460 */
461 buf->f_frsize = dentry->d_sb->s_blocksize;
462
463 /*
464 * On most *nix systems, f_blocks, f_bfree, and f_bavail
465 * are reported in units of f_frsize. Linux hasn't had
466 * an f_frsize field in its statfs struct until recently,
467 * thus historically Linux's sys_statfs reports these
468 * fields in units of f_bsize.
469 */
470 buf->f_bsize = dentry->d_sb->s_blocksize;
471 blockbits = dentry->d_sb->s_blocksize_bits;
472 blockres = (1 << blockbits) - 1;
473 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
474 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
475 buf->f_bavail = (res.abytes + blockres) >> blockbits;
476
477 buf->f_files = res.tfiles;
478 buf->f_ffree = res.afiles;
479
480 buf->f_namelen = server->namelen;
481
482 return 0;
483
484 out_err:
485 dprintk("%s: statfs error = %d\n", __func__, -error);
486 return error;
487 }
488 EXPORT_SYMBOL_GPL(nfs_statfs);
489
490 /*
491 * Map the security flavour number to a name
492 */
493 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
494 {
495 static const struct {
496 rpc_authflavor_t flavour;
497 const char *str;
498 } sec_flavours[] = {
499 { RPC_AUTH_NULL, "null" },
500 { RPC_AUTH_UNIX, "sys" },
501 { RPC_AUTH_GSS_KRB5, "krb5" },
502 { RPC_AUTH_GSS_KRB5I, "krb5i" },
503 { RPC_AUTH_GSS_KRB5P, "krb5p" },
504 { RPC_AUTH_GSS_LKEY, "lkey" },
505 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
506 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
507 { RPC_AUTH_GSS_SPKM, "spkm" },
508 { RPC_AUTH_GSS_SPKMI, "spkmi" },
509 { RPC_AUTH_GSS_SPKMP, "spkmp" },
510 { UINT_MAX, "unknown" }
511 };
512 int i;
513
514 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
515 if (sec_flavours[i].flavour == flavour)
516 break;
517 }
518 return sec_flavours[i].str;
519 }
520
521 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
522 int showdefaults)
523 {
524 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
525
526 seq_printf(m, ",mountproto=");
527 switch (sap->sa_family) {
528 case AF_INET:
529 switch (nfss->mountd_protocol) {
530 case IPPROTO_UDP:
531 seq_printf(m, RPCBIND_NETID_UDP);
532 break;
533 case IPPROTO_TCP:
534 seq_printf(m, RPCBIND_NETID_TCP);
535 break;
536 default:
537 if (showdefaults)
538 seq_printf(m, "auto");
539 }
540 break;
541 case AF_INET6:
542 switch (nfss->mountd_protocol) {
543 case IPPROTO_UDP:
544 seq_printf(m, RPCBIND_NETID_UDP6);
545 break;
546 case IPPROTO_TCP:
547 seq_printf(m, RPCBIND_NETID_TCP6);
548 break;
549 default:
550 if (showdefaults)
551 seq_printf(m, "auto");
552 }
553 break;
554 default:
555 if (showdefaults)
556 seq_printf(m, "auto");
557 }
558 }
559
560 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
561 int showdefaults)
562 {
563 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
564
565 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
566 return;
567
568 switch (sap->sa_family) {
569 case AF_INET: {
570 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
571 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
572 break;
573 }
574 case AF_INET6: {
575 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
576 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
577 break;
578 }
579 default:
580 if (showdefaults)
581 seq_printf(m, ",mountaddr=unspecified");
582 }
583
584 if (nfss->mountd_version || showdefaults)
585 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
586 if ((nfss->mountd_port &&
587 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
588 showdefaults)
589 seq_printf(m, ",mountport=%u", nfss->mountd_port);
590
591 nfs_show_mountd_netid(m, nfss, showdefaults);
592 }
593
594 #if IS_ENABLED(CONFIG_NFS_V4)
595 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
596 int showdefaults)
597 {
598 struct nfs_client *clp = nfss->nfs_client;
599
600 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
601 }
602 #else
603 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
604 int showdefaults)
605 {
606 }
607 #endif
608
609 static void nfs_show_nfs_version(struct seq_file *m,
610 unsigned int version,
611 unsigned int minorversion)
612 {
613 seq_printf(m, ",vers=%u", version);
614 if (version == 4)
615 seq_printf(m, ".%u", minorversion);
616 }
617
618 /*
619 * Describe the mount options in force on this server representation
620 */
621 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
622 int showdefaults)
623 {
624 static const struct proc_nfs_info {
625 int flag;
626 const char *str;
627 const char *nostr;
628 } nfs_info[] = {
629 { NFS_MOUNT_SOFT, ",soft", ",hard" },
630 { NFS_MOUNT_POSIX, ",posix", "" },
631 { NFS_MOUNT_NOCTO, ",nocto", "" },
632 { NFS_MOUNT_NOAC, ",noac", "" },
633 { NFS_MOUNT_NONLM, ",nolock", "" },
634 { NFS_MOUNT_NOACL, ",noacl", "" },
635 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
636 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
637 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
638 { 0, NULL, NULL }
639 };
640 const struct proc_nfs_info *nfs_infop;
641 struct nfs_client *clp = nfss->nfs_client;
642 u32 version = clp->rpc_ops->version;
643 int local_flock, local_fcntl;
644
645 nfs_show_nfs_version(m, version, clp->cl_minorversion);
646 seq_printf(m, ",rsize=%u", nfss->rsize);
647 seq_printf(m, ",wsize=%u", nfss->wsize);
648 if (nfss->bsize != 0)
649 seq_printf(m, ",bsize=%u", nfss->bsize);
650 seq_printf(m, ",namlen=%u", nfss->namelen);
651 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
652 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
653 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
654 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
655 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
656 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
657 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
658 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
659 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
660 if (nfss->flags & nfs_infop->flag)
661 seq_puts(m, nfs_infop->str);
662 else
663 seq_puts(m, nfs_infop->nostr);
664 }
665 rcu_read_lock();
666 seq_printf(m, ",proto=%s",
667 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
668 rcu_read_unlock();
669 if (version == 4) {
670 if (nfss->port != NFS_PORT)
671 seq_printf(m, ",port=%u", nfss->port);
672 } else
673 if (nfss->port)
674 seq_printf(m, ",port=%u", nfss->port);
675
676 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
677 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
678 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
679
680 if (version != 4)
681 nfs_show_mountd_options(m, nfss, showdefaults);
682 else
683 nfs_show_nfsv4_options(m, nfss, showdefaults);
684
685 if (nfss->options & NFS_OPTION_FSCACHE)
686 seq_printf(m, ",fsc");
687
688 if (nfss->options & NFS_OPTION_MIGRATION)
689 seq_printf(m, ",migration");
690
691 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
692 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
693 seq_printf(m, ",lookupcache=none");
694 else
695 seq_printf(m, ",lookupcache=pos");
696 }
697
698 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
699 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
700
701 if (!local_flock && !local_fcntl)
702 seq_printf(m, ",local_lock=none");
703 else if (local_flock && local_fcntl)
704 seq_printf(m, ",local_lock=all");
705 else if (local_flock)
706 seq_printf(m, ",local_lock=flock");
707 else
708 seq_printf(m, ",local_lock=posix");
709 }
710
711 /*
712 * Describe the mount options on this VFS mountpoint
713 */
714 int nfs_show_options(struct seq_file *m, struct dentry *root)
715 {
716 struct nfs_server *nfss = NFS_SB(root->d_sb);
717
718 nfs_show_mount_options(m, nfss, 0);
719
720 rcu_read_lock();
721 seq_printf(m, ",addr=%s",
722 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
723 RPC_DISPLAY_ADDR));
724 rcu_read_unlock();
725
726 return 0;
727 }
728 EXPORT_SYMBOL_GPL(nfs_show_options);
729
730 #if IS_ENABLED(CONFIG_NFS_V4)
731 #ifdef CONFIG_NFS_V4_1
732 static void show_sessions(struct seq_file *m, struct nfs_server *server)
733 {
734 if (nfs4_has_session(server->nfs_client))
735 seq_printf(m, ",sessions");
736 }
737 #else
738 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
739 #endif
740 #endif
741
742 #ifdef CONFIG_NFS_V4_1
743 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
744 {
745 seq_printf(m, ",pnfs=");
746 if (server->pnfs_curr_ld)
747 seq_printf(m, "%s", server->pnfs_curr_ld->name);
748 else
749 seq_printf(m, "not configured");
750 }
751
752 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
753 {
754 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
755 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
756 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
757 "date='%llu,%u'",
758 impl_id->name, impl_id->domain,
759 impl_id->date.seconds, impl_id->date.nseconds);
760 }
761 }
762 #else
763 #if IS_ENABLED(CONFIG_NFS_V4)
764 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
765 {
766 }
767 #endif
768 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
769 {
770 }
771 #endif
772
773 int nfs_show_devname(struct seq_file *m, struct dentry *root)
774 {
775 char *page = (char *) __get_free_page(GFP_KERNEL);
776 char *devname, *dummy;
777 int err = 0;
778 if (!page)
779 return -ENOMEM;
780 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
781 if (IS_ERR(devname))
782 err = PTR_ERR(devname);
783 else
784 seq_escape(m, devname, " \t\n\\");
785 free_page((unsigned long)page);
786 return err;
787 }
788 EXPORT_SYMBOL_GPL(nfs_show_devname);
789
790 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
791 {
792 seq_puts(m, "/");
793 return 0;
794 }
795 EXPORT_SYMBOL_GPL(nfs_show_path);
796
797 /*
798 * Present statistical information for this VFS mountpoint
799 */
800 int nfs_show_stats(struct seq_file *m, struct dentry *root)
801 {
802 int i, cpu;
803 struct nfs_server *nfss = NFS_SB(root->d_sb);
804 struct rpc_auth *auth = nfss->client->cl_auth;
805 struct nfs_iostats totals = { };
806
807 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
808
809 /*
810 * Display all mount option settings
811 */
812 seq_printf(m, "\n\topts:\t");
813 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
814 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
815 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
816 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
817 nfs_show_mount_options(m, nfss, 1);
818
819 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
820
821 show_implementation_id(m, nfss);
822
823 seq_printf(m, "\n\tcaps:\t");
824 seq_printf(m, "caps=0x%x", nfss->caps);
825 seq_printf(m, ",wtmult=%u", nfss->wtmult);
826 seq_printf(m, ",dtsize=%u", nfss->dtsize);
827 seq_printf(m, ",bsize=%u", nfss->bsize);
828 seq_printf(m, ",namlen=%u", nfss->namelen);
829
830 #if IS_ENABLED(CONFIG_NFS_V4)
831 if (nfss->nfs_client->rpc_ops->version == 4) {
832 seq_printf(m, "\n\tnfsv4:\t");
833 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
834 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
835 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
836 show_sessions(m, nfss);
837 show_pnfs(m, nfss);
838 }
839 #endif
840
841 /*
842 * Display security flavor in effect for this mount
843 */
844 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
845 if (auth->au_flavor)
846 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
847
848 /*
849 * Display superblock I/O counters
850 */
851 for_each_possible_cpu(cpu) {
852 struct nfs_iostats *stats;
853
854 preempt_disable();
855 stats = per_cpu_ptr(nfss->io_stats, cpu);
856
857 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
858 totals.events[i] += stats->events[i];
859 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
860 totals.bytes[i] += stats->bytes[i];
861 #ifdef CONFIG_NFS_FSCACHE
862 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
863 totals.fscache[i] += stats->fscache[i];
864 #endif
865
866 preempt_enable();
867 }
868
869 seq_printf(m, "\n\tevents:\t");
870 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
871 seq_printf(m, "%lu ", totals.events[i]);
872 seq_printf(m, "\n\tbytes:\t");
873 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
874 seq_printf(m, "%Lu ", totals.bytes[i]);
875 #ifdef CONFIG_NFS_FSCACHE
876 if (nfss->options & NFS_OPTION_FSCACHE) {
877 seq_printf(m, "\n\tfsc:\t");
878 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
879 seq_printf(m, "%Lu ", totals.bytes[i]);
880 }
881 #endif
882 seq_printf(m, "\n");
883
884 rpc_print_iostats(m, nfss->client);
885
886 return 0;
887 }
888 EXPORT_SYMBOL_GPL(nfs_show_stats);
889
890 /*
891 * Begin unmount by attempting to remove all automounted mountpoints we added
892 * in response to xdev traversals and referrals
893 */
894 void nfs_umount_begin(struct super_block *sb)
895 {
896 struct nfs_server *server;
897 struct rpc_clnt *rpc;
898
899 server = NFS_SB(sb);
900 /* -EIO all pending I/O */
901 rpc = server->client_acl;
902 if (!IS_ERR(rpc))
903 rpc_killall_tasks(rpc);
904 rpc = server->client;
905 if (!IS_ERR(rpc))
906 rpc_killall_tasks(rpc);
907 }
908 EXPORT_SYMBOL_GPL(nfs_umount_begin);
909
910 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
911 {
912 struct nfs_parsed_mount_data *data;
913
914 data = kzalloc(sizeof(*data), GFP_KERNEL);
915 if (data) {
916 data->acregmin = NFS_DEF_ACREGMIN;
917 data->acregmax = NFS_DEF_ACREGMAX;
918 data->acdirmin = NFS_DEF_ACDIRMIN;
919 data->acdirmax = NFS_DEF_ACDIRMAX;
920 data->mount_server.port = NFS_UNSPEC_PORT;
921 data->nfs_server.port = NFS_UNSPEC_PORT;
922 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
923 data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR;
924 data->auth_flavor_len = 1;
925 data->minorversion = 0;
926 data->need_mount = true;
927 data->net = current->nsproxy->net_ns;
928 security_init_mnt_opts(&data->lsm_opts);
929 }
930 return data;
931 }
932
933 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
934 {
935 if (data) {
936 kfree(data->client_address);
937 kfree(data->mount_server.hostname);
938 kfree(data->nfs_server.export_path);
939 kfree(data->nfs_server.hostname);
940 kfree(data->fscache_uniq);
941 security_free_mnt_opts(&data->lsm_opts);
942 kfree(data);
943 }
944 }
945
946 /*
947 * Sanity-check a server address provided by the mount command.
948 *
949 * Address family must be initialized, and address must not be
950 * the ANY address for that family.
951 */
952 static int nfs_verify_server_address(struct sockaddr *addr)
953 {
954 switch (addr->sa_family) {
955 case AF_INET: {
956 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
957 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
958 }
959 case AF_INET6: {
960 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
961 return !ipv6_addr_any(sa);
962 }
963 }
964
965 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
966 return 0;
967 }
968
969 /*
970 * Select between a default port value and a user-specified port value.
971 * If a zero value is set, then autobind will be used.
972 */
973 static void nfs_set_port(struct sockaddr *sap, int *port,
974 const unsigned short default_port)
975 {
976 if (*port == NFS_UNSPEC_PORT)
977 *port = default_port;
978
979 rpc_set_port(sap, *port);
980 }
981
982 /*
983 * Sanity check the NFS transport protocol.
984 *
985 */
986 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
987 {
988 switch (mnt->nfs_server.protocol) {
989 case XPRT_TRANSPORT_UDP:
990 case XPRT_TRANSPORT_TCP:
991 case XPRT_TRANSPORT_RDMA:
992 break;
993 default:
994 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
995 }
996 }
997
998 /*
999 * For text based NFSv2/v3 mounts, the mount protocol transport default
1000 * settings should depend upon the specified NFS transport.
1001 */
1002 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1003 {
1004 nfs_validate_transport_protocol(mnt);
1005
1006 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1007 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1008 return;
1009 switch (mnt->nfs_server.protocol) {
1010 case XPRT_TRANSPORT_UDP:
1011 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1012 break;
1013 case XPRT_TRANSPORT_TCP:
1014 case XPRT_TRANSPORT_RDMA:
1015 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1016 }
1017 }
1018
1019 /*
1020 * Parse the value of the 'sec=' option.
1021 */
1022 static int nfs_parse_security_flavors(char *value,
1023 struct nfs_parsed_mount_data *mnt)
1024 {
1025 substring_t args[MAX_OPT_ARGS];
1026
1027 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1028
1029 switch (match_token(value, nfs_secflavor_tokens, args)) {
1030 case Opt_sec_none:
1031 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1032 break;
1033 case Opt_sec_sys:
1034 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1035 break;
1036 case Opt_sec_krb5:
1037 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1038 break;
1039 case Opt_sec_krb5i:
1040 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1041 break;
1042 case Opt_sec_krb5p:
1043 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1044 break;
1045 case Opt_sec_lkey:
1046 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1047 break;
1048 case Opt_sec_lkeyi:
1049 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1050 break;
1051 case Opt_sec_lkeyp:
1052 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1053 break;
1054 case Opt_sec_spkm:
1055 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1056 break;
1057 case Opt_sec_spkmi:
1058 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1059 break;
1060 case Opt_sec_spkmp:
1061 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1062 break;
1063 default:
1064 return 0;
1065 }
1066
1067 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1068 mnt->auth_flavor_len = 1;
1069 return 1;
1070 }
1071
1072 static int nfs_parse_version_string(char *string,
1073 struct nfs_parsed_mount_data *mnt,
1074 substring_t *args)
1075 {
1076 mnt->flags &= ~NFS_MOUNT_VER3;
1077 switch (match_token(string, nfs_vers_tokens, args)) {
1078 case Opt_vers_2:
1079 mnt->version = 2;
1080 break;
1081 case Opt_vers_3:
1082 mnt->flags |= NFS_MOUNT_VER3;
1083 mnt->version = 3;
1084 break;
1085 case Opt_vers_4:
1086 /* Backward compatibility option. In future,
1087 * the mount program should always supply
1088 * a NFSv4 minor version number.
1089 */
1090 mnt->version = 4;
1091 break;
1092 case Opt_vers_4_0:
1093 mnt->version = 4;
1094 mnt->minorversion = 0;
1095 break;
1096 case Opt_vers_4_1:
1097 mnt->version = 4;
1098 mnt->minorversion = 1;
1099 break;
1100 default:
1101 return 0;
1102 }
1103 return 1;
1104 }
1105
1106 static int nfs_get_option_str(substring_t args[], char **option)
1107 {
1108 kfree(*option);
1109 *option = match_strdup(args);
1110 return !*option;
1111 }
1112
1113 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1114 {
1115 int rc;
1116 char *string;
1117
1118 string = match_strdup(args);
1119 if (string == NULL)
1120 return -ENOMEM;
1121 rc = kstrtoul(string, 10, option);
1122 kfree(string);
1123
1124 return rc;
1125 }
1126
1127 /*
1128 * Error-check and convert a string of mount options from user space into
1129 * a data structure. The whole mount string is processed; bad options are
1130 * skipped as they are encountered. If there were no errors, return 1;
1131 * otherwise return 0 (zero).
1132 */
1133 static int nfs_parse_mount_options(char *raw,
1134 struct nfs_parsed_mount_data *mnt)
1135 {
1136 char *p, *string, *secdata;
1137 int rc, sloppy = 0, invalid_option = 0;
1138 unsigned short protofamily = AF_UNSPEC;
1139 unsigned short mountfamily = AF_UNSPEC;
1140
1141 if (!raw) {
1142 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1143 return 1;
1144 }
1145 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1146
1147 secdata = alloc_secdata();
1148 if (!secdata)
1149 goto out_nomem;
1150
1151 rc = security_sb_copy_data(raw, secdata);
1152 if (rc)
1153 goto out_security_failure;
1154
1155 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1156 if (rc)
1157 goto out_security_failure;
1158
1159 free_secdata(secdata);
1160
1161 while ((p = strsep(&raw, ",")) != NULL) {
1162 substring_t args[MAX_OPT_ARGS];
1163 unsigned long option;
1164 int token;
1165
1166 if (!*p)
1167 continue;
1168
1169 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1170
1171 token = match_token(p, nfs_mount_option_tokens, args);
1172 switch (token) {
1173
1174 /*
1175 * boolean options: foo/nofoo
1176 */
1177 case Opt_soft:
1178 mnt->flags |= NFS_MOUNT_SOFT;
1179 break;
1180 case Opt_hard:
1181 mnt->flags &= ~NFS_MOUNT_SOFT;
1182 break;
1183 case Opt_posix:
1184 mnt->flags |= NFS_MOUNT_POSIX;
1185 break;
1186 case Opt_noposix:
1187 mnt->flags &= ~NFS_MOUNT_POSIX;
1188 break;
1189 case Opt_cto:
1190 mnt->flags &= ~NFS_MOUNT_NOCTO;
1191 break;
1192 case Opt_nocto:
1193 mnt->flags |= NFS_MOUNT_NOCTO;
1194 break;
1195 case Opt_ac:
1196 mnt->flags &= ~NFS_MOUNT_NOAC;
1197 break;
1198 case Opt_noac:
1199 mnt->flags |= NFS_MOUNT_NOAC;
1200 break;
1201 case Opt_lock:
1202 mnt->flags &= ~NFS_MOUNT_NONLM;
1203 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1204 NFS_MOUNT_LOCAL_FCNTL);
1205 break;
1206 case Opt_nolock:
1207 mnt->flags |= NFS_MOUNT_NONLM;
1208 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1209 NFS_MOUNT_LOCAL_FCNTL);
1210 break;
1211 case Opt_udp:
1212 mnt->flags &= ~NFS_MOUNT_TCP;
1213 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1214 break;
1215 case Opt_tcp:
1216 mnt->flags |= NFS_MOUNT_TCP;
1217 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1218 break;
1219 case Opt_rdma:
1220 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1221 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1222 xprt_load_transport(p);
1223 break;
1224 case Opt_acl:
1225 mnt->flags &= ~NFS_MOUNT_NOACL;
1226 break;
1227 case Opt_noacl:
1228 mnt->flags |= NFS_MOUNT_NOACL;
1229 break;
1230 case Opt_rdirplus:
1231 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1232 break;
1233 case Opt_nordirplus:
1234 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1235 break;
1236 case Opt_sharecache:
1237 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1238 break;
1239 case Opt_nosharecache:
1240 mnt->flags |= NFS_MOUNT_UNSHARED;
1241 break;
1242 case Opt_resvport:
1243 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1244 break;
1245 case Opt_noresvport:
1246 mnt->flags |= NFS_MOUNT_NORESVPORT;
1247 break;
1248 case Opt_fscache:
1249 mnt->options |= NFS_OPTION_FSCACHE;
1250 kfree(mnt->fscache_uniq);
1251 mnt->fscache_uniq = NULL;
1252 break;
1253 case Opt_nofscache:
1254 mnt->options &= ~NFS_OPTION_FSCACHE;
1255 kfree(mnt->fscache_uniq);
1256 mnt->fscache_uniq = NULL;
1257 break;
1258 case Opt_migration:
1259 mnt->options |= NFS_OPTION_MIGRATION;
1260 break;
1261 case Opt_nomigration:
1262 mnt->options &= NFS_OPTION_MIGRATION;
1263 break;
1264
1265 /*
1266 * options that take numeric values
1267 */
1268 case Opt_port:
1269 if (nfs_get_option_ul(args, &option) ||
1270 option > USHRT_MAX)
1271 goto out_invalid_value;
1272 mnt->nfs_server.port = option;
1273 break;
1274 case Opt_rsize:
1275 if (nfs_get_option_ul(args, &option))
1276 goto out_invalid_value;
1277 mnt->rsize = option;
1278 break;
1279 case Opt_wsize:
1280 if (nfs_get_option_ul(args, &option))
1281 goto out_invalid_value;
1282 mnt->wsize = option;
1283 break;
1284 case Opt_bsize:
1285 if (nfs_get_option_ul(args, &option))
1286 goto out_invalid_value;
1287 mnt->bsize = option;
1288 break;
1289 case Opt_timeo:
1290 if (nfs_get_option_ul(args, &option) || option == 0)
1291 goto out_invalid_value;
1292 mnt->timeo = option;
1293 break;
1294 case Opt_retrans:
1295 if (nfs_get_option_ul(args, &option) || option == 0)
1296 goto out_invalid_value;
1297 mnt->retrans = option;
1298 break;
1299 case Opt_acregmin:
1300 if (nfs_get_option_ul(args, &option))
1301 goto out_invalid_value;
1302 mnt->acregmin = option;
1303 break;
1304 case Opt_acregmax:
1305 if (nfs_get_option_ul(args, &option))
1306 goto out_invalid_value;
1307 mnt->acregmax = option;
1308 break;
1309 case Opt_acdirmin:
1310 if (nfs_get_option_ul(args, &option))
1311 goto out_invalid_value;
1312 mnt->acdirmin = option;
1313 break;
1314 case Opt_acdirmax:
1315 if (nfs_get_option_ul(args, &option))
1316 goto out_invalid_value;
1317 mnt->acdirmax = option;
1318 break;
1319 case Opt_actimeo:
1320 if (nfs_get_option_ul(args, &option))
1321 goto out_invalid_value;
1322 mnt->acregmin = mnt->acregmax =
1323 mnt->acdirmin = mnt->acdirmax = option;
1324 break;
1325 case Opt_namelen:
1326 if (nfs_get_option_ul(args, &option))
1327 goto out_invalid_value;
1328 mnt->namlen = option;
1329 break;
1330 case Opt_mountport:
1331 if (nfs_get_option_ul(args, &option) ||
1332 option > USHRT_MAX)
1333 goto out_invalid_value;
1334 mnt->mount_server.port = option;
1335 break;
1336 case Opt_mountvers:
1337 if (nfs_get_option_ul(args, &option) ||
1338 option < NFS_MNT_VERSION ||
1339 option > NFS_MNT3_VERSION)
1340 goto out_invalid_value;
1341 mnt->mount_server.version = option;
1342 break;
1343 case Opt_minorversion:
1344 if (nfs_get_option_ul(args, &option))
1345 goto out_invalid_value;
1346 if (option > NFS4_MAX_MINOR_VERSION)
1347 goto out_invalid_value;
1348 mnt->minorversion = option;
1349 break;
1350
1351 /*
1352 * options that take text values
1353 */
1354 case Opt_nfsvers:
1355 string = match_strdup(args);
1356 if (string == NULL)
1357 goto out_nomem;
1358 rc = nfs_parse_version_string(string, mnt, args);
1359 kfree(string);
1360 if (!rc)
1361 goto out_invalid_value;
1362 break;
1363 case Opt_sec:
1364 string = match_strdup(args);
1365 if (string == NULL)
1366 goto out_nomem;
1367 rc = nfs_parse_security_flavors(string, mnt);
1368 kfree(string);
1369 if (!rc) {
1370 dfprintk(MOUNT, "NFS: unrecognized "
1371 "security flavor\n");
1372 return 0;
1373 }
1374 break;
1375 case Opt_proto:
1376 string = match_strdup(args);
1377 if (string == NULL)
1378 goto out_nomem;
1379 token = match_token(string,
1380 nfs_xprt_protocol_tokens, args);
1381
1382 protofamily = AF_INET;
1383 switch (token) {
1384 case Opt_xprt_udp6:
1385 protofamily = AF_INET6;
1386 case Opt_xprt_udp:
1387 mnt->flags &= ~NFS_MOUNT_TCP;
1388 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1389 break;
1390 case Opt_xprt_tcp6:
1391 protofamily = AF_INET6;
1392 case Opt_xprt_tcp:
1393 mnt->flags |= NFS_MOUNT_TCP;
1394 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1395 break;
1396 case Opt_xprt_rdma:
1397 /* vector side protocols to TCP */
1398 mnt->flags |= NFS_MOUNT_TCP;
1399 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1400 xprt_load_transport(string);
1401 break;
1402 default:
1403 dfprintk(MOUNT, "NFS: unrecognized "
1404 "transport protocol\n");
1405 kfree(string);
1406 return 0;
1407 }
1408 kfree(string);
1409 break;
1410 case Opt_mountproto:
1411 string = match_strdup(args);
1412 if (string == NULL)
1413 goto out_nomem;
1414 token = match_token(string,
1415 nfs_xprt_protocol_tokens, args);
1416 kfree(string);
1417
1418 mountfamily = AF_INET;
1419 switch (token) {
1420 case Opt_xprt_udp6:
1421 mountfamily = AF_INET6;
1422 case Opt_xprt_udp:
1423 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1424 break;
1425 case Opt_xprt_tcp6:
1426 mountfamily = AF_INET6;
1427 case Opt_xprt_tcp:
1428 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1429 break;
1430 case Opt_xprt_rdma: /* not used for side protocols */
1431 default:
1432 dfprintk(MOUNT, "NFS: unrecognized "
1433 "transport protocol\n");
1434 return 0;
1435 }
1436 break;
1437 case Opt_addr:
1438 string = match_strdup(args);
1439 if (string == NULL)
1440 goto out_nomem;
1441 mnt->nfs_server.addrlen =
1442 rpc_pton(mnt->net, string, strlen(string),
1443 (struct sockaddr *)
1444 &mnt->nfs_server.address,
1445 sizeof(mnt->nfs_server.address));
1446 kfree(string);
1447 if (mnt->nfs_server.addrlen == 0)
1448 goto out_invalid_address;
1449 break;
1450 case Opt_clientaddr:
1451 if (nfs_get_option_str(args, &mnt->client_address))
1452 goto out_nomem;
1453 break;
1454 case Opt_mounthost:
1455 if (nfs_get_option_str(args,
1456 &mnt->mount_server.hostname))
1457 goto out_nomem;
1458 break;
1459 case Opt_mountaddr:
1460 string = match_strdup(args);
1461 if (string == NULL)
1462 goto out_nomem;
1463 mnt->mount_server.addrlen =
1464 rpc_pton(mnt->net, string, strlen(string),
1465 (struct sockaddr *)
1466 &mnt->mount_server.address,
1467 sizeof(mnt->mount_server.address));
1468 kfree(string);
1469 if (mnt->mount_server.addrlen == 0)
1470 goto out_invalid_address;
1471 break;
1472 case Opt_lookupcache:
1473 string = match_strdup(args);
1474 if (string == NULL)
1475 goto out_nomem;
1476 token = match_token(string,
1477 nfs_lookupcache_tokens, args);
1478 kfree(string);
1479 switch (token) {
1480 case Opt_lookupcache_all:
1481 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1482 break;
1483 case Opt_lookupcache_positive:
1484 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1485 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1486 break;
1487 case Opt_lookupcache_none:
1488 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1489 break;
1490 default:
1491 dfprintk(MOUNT, "NFS: invalid "
1492 "lookupcache argument\n");
1493 return 0;
1494 };
1495 break;
1496 case Opt_fscache_uniq:
1497 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1498 goto out_nomem;
1499 mnt->options |= NFS_OPTION_FSCACHE;
1500 break;
1501 case Opt_local_lock:
1502 string = match_strdup(args);
1503 if (string == NULL)
1504 goto out_nomem;
1505 token = match_token(string, nfs_local_lock_tokens,
1506 args);
1507 kfree(string);
1508 switch (token) {
1509 case Opt_local_lock_all:
1510 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1511 NFS_MOUNT_LOCAL_FCNTL);
1512 break;
1513 case Opt_local_lock_flock:
1514 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1515 break;
1516 case Opt_local_lock_posix:
1517 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1518 break;
1519 case Opt_local_lock_none:
1520 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1521 NFS_MOUNT_LOCAL_FCNTL);
1522 break;
1523 default:
1524 dfprintk(MOUNT, "NFS: invalid "
1525 "local_lock argument\n");
1526 return 0;
1527 };
1528 break;
1529
1530 /*
1531 * Special options
1532 */
1533 case Opt_sloppy:
1534 sloppy = 1;
1535 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1536 break;
1537 case Opt_userspace:
1538 case Opt_deprecated:
1539 dfprintk(MOUNT, "NFS: ignoring mount option "
1540 "'%s'\n", p);
1541 break;
1542
1543 default:
1544 invalid_option = 1;
1545 dfprintk(MOUNT, "NFS: unrecognized mount option "
1546 "'%s'\n", p);
1547 }
1548 }
1549
1550 if (!sloppy && invalid_option)
1551 return 0;
1552
1553 if (mnt->minorversion && mnt->version != 4)
1554 goto out_minorversion_mismatch;
1555
1556 if (mnt->options & NFS_OPTION_MIGRATION &&
1557 mnt->version != 4 && mnt->minorversion != 0)
1558 goto out_migration_misuse;
1559
1560 /*
1561 * verify that any proto=/mountproto= options match the address
1562 * families in the addr=/mountaddr= options.
1563 */
1564 if (protofamily != AF_UNSPEC &&
1565 protofamily != mnt->nfs_server.address.ss_family)
1566 goto out_proto_mismatch;
1567
1568 if (mountfamily != AF_UNSPEC) {
1569 if (mnt->mount_server.addrlen) {
1570 if (mountfamily != mnt->mount_server.address.ss_family)
1571 goto out_mountproto_mismatch;
1572 } else {
1573 if (mountfamily != mnt->nfs_server.address.ss_family)
1574 goto out_mountproto_mismatch;
1575 }
1576 }
1577
1578 return 1;
1579
1580 out_mountproto_mismatch:
1581 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1582 "option\n");
1583 return 0;
1584 out_proto_mismatch:
1585 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1586 return 0;
1587 out_invalid_address:
1588 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1589 return 0;
1590 out_invalid_value:
1591 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1592 return 0;
1593 out_minorversion_mismatch:
1594 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1595 "minorversion=%u\n", mnt->version, mnt->minorversion);
1596 return 0;
1597 out_migration_misuse:
1598 printk(KERN_INFO
1599 "NFS: 'migration' not supported for this NFS version\n");
1600 return 0;
1601 out_nomem:
1602 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1603 return 0;
1604 out_security_failure:
1605 free_secdata(secdata);
1606 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1607 return 0;
1608 }
1609
1610 /*
1611 * Select a security flavor for this mount. The selected flavor
1612 * is planted in args->auth_flavors[0].
1613 */
1614 static void nfs_select_flavor(struct nfs_parsed_mount_data *args,
1615 struct nfs_mount_request *request)
1616 {
1617 unsigned int i, count = *(request->auth_flav_len);
1618 rpc_authflavor_t flavor;
1619
1620 if (args->auth_flavors[0] != RPC_AUTH_MAXFLAVOR)
1621 goto out;
1622
1623 /*
1624 * The NFSv2 MNT operation does not return a flavor list.
1625 */
1626 if (args->mount_server.version != NFS_MNT3_VERSION)
1627 goto out_default;
1628
1629 /*
1630 * Certain releases of Linux's mountd return an empty
1631 * flavor list in some cases.
1632 */
1633 if (count == 0)
1634 goto out_default;
1635
1636 /*
1637 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1638 * flavor listed first. However, some servers list
1639 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1640 */
1641 for (i = 0; i < count; i++) {
1642 struct rpcsec_gss_info info;
1643
1644 flavor = request->auth_flavs[i];
1645 switch (flavor) {
1646 case RPC_AUTH_UNIX:
1647 goto out_set;
1648 case RPC_AUTH_NULL:
1649 continue;
1650 default:
1651 if (rpcauth_get_gssinfo(flavor, &info) == 0)
1652 goto out_set;
1653 }
1654 }
1655
1656 out_default:
1657 flavor = RPC_AUTH_UNIX;
1658 out_set:
1659 args->auth_flavors[0] = flavor;
1660 out:
1661 dfprintk(MOUNT, "NFS: using auth flavor %d\n", args->auth_flavors[0]);
1662 }
1663
1664 /*
1665 * Use the remote server's MOUNT service to request the NFS file handle
1666 * corresponding to the provided path.
1667 */
1668 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1669 struct nfs_fh *root_fh)
1670 {
1671 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1672 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1673 struct nfs_mount_request request = {
1674 .sap = (struct sockaddr *)
1675 &args->mount_server.address,
1676 .dirpath = args->nfs_server.export_path,
1677 .protocol = args->mount_server.protocol,
1678 .fh = root_fh,
1679 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1680 .auth_flav_len = &server_authlist_len,
1681 .auth_flavs = server_authlist,
1682 .net = args->net,
1683 };
1684 int status;
1685
1686 if (args->mount_server.version == 0) {
1687 switch (args->version) {
1688 default:
1689 args->mount_server.version = NFS_MNT3_VERSION;
1690 break;
1691 case 2:
1692 args->mount_server.version = NFS_MNT_VERSION;
1693 }
1694 }
1695 request.version = args->mount_server.version;
1696
1697 if (args->mount_server.hostname)
1698 request.hostname = args->mount_server.hostname;
1699 else
1700 request.hostname = args->nfs_server.hostname;
1701
1702 /*
1703 * Construct the mount server's address.
1704 */
1705 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1706 memcpy(request.sap, &args->nfs_server.address,
1707 args->nfs_server.addrlen);
1708 args->mount_server.addrlen = args->nfs_server.addrlen;
1709 }
1710 request.salen = args->mount_server.addrlen;
1711 nfs_set_port(request.sap, &args->mount_server.port, 0);
1712
1713 /*
1714 * Now ask the mount server to map our export path
1715 * to a file handle.
1716 */
1717 status = nfs_mount(&request);
1718 if (status != 0) {
1719 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1720 request.hostname, status);
1721 return status;
1722 }
1723
1724 nfs_select_flavor(args, &request);
1725 return 0;
1726 }
1727
1728 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1729 struct nfs_mount_info *mount_info,
1730 struct nfs_subversion *nfs_mod)
1731 {
1732 int status;
1733 struct nfs_server *server;
1734
1735 if (mount_info->parsed->need_mount) {
1736 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1737 if (status)
1738 return ERR_PTR(status);
1739 }
1740
1741 /* Get a volume representation */
1742 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1743 if (IS_ERR(server))
1744 return ERR_CAST(server);
1745
1746 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1747 }
1748 EXPORT_SYMBOL_GPL(nfs_try_mount);
1749
1750 /*
1751 * Split "dev_name" into "hostname:export_path".
1752 *
1753 * The leftmost colon demarks the split between the server's hostname
1754 * and the export path. If the hostname starts with a left square
1755 * bracket, then it may contain colons.
1756 *
1757 * Note: caller frees hostname and export path, even on error.
1758 */
1759 static int nfs_parse_devname(const char *dev_name,
1760 char **hostname, size_t maxnamlen,
1761 char **export_path, size_t maxpathlen)
1762 {
1763 size_t len;
1764 char *end;
1765
1766 /* Is the host name protected with square brakcets? */
1767 if (*dev_name == '[') {
1768 end = strchr(++dev_name, ']');
1769 if (end == NULL || end[1] != ':')
1770 goto out_bad_devname;
1771
1772 len = end - dev_name;
1773 end++;
1774 } else {
1775 char *comma;
1776
1777 end = strchr(dev_name, ':');
1778 if (end == NULL)
1779 goto out_bad_devname;
1780 len = end - dev_name;
1781
1782 /* kill possible hostname list: not supported */
1783 comma = strchr(dev_name, ',');
1784 if (comma != NULL && comma < end)
1785 *comma = 0;
1786 }
1787
1788 if (len > maxnamlen)
1789 goto out_hostname;
1790
1791 /* N.B. caller will free nfs_server.hostname in all cases */
1792 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1793 if (*hostname == NULL)
1794 goto out_nomem;
1795 len = strlen(++end);
1796 if (len > maxpathlen)
1797 goto out_path;
1798 *export_path = kstrndup(end, len, GFP_KERNEL);
1799 if (!*export_path)
1800 goto out_nomem;
1801
1802 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1803 return 0;
1804
1805 out_bad_devname:
1806 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1807 return -EINVAL;
1808
1809 out_nomem:
1810 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1811 return -ENOMEM;
1812
1813 out_hostname:
1814 dfprintk(MOUNT, "NFS: server hostname too long\n");
1815 return -ENAMETOOLONG;
1816
1817 out_path:
1818 dfprintk(MOUNT, "NFS: export pathname too long\n");
1819 return -ENAMETOOLONG;
1820 }
1821
1822 /*
1823 * Validate the NFS2/NFS3 mount data
1824 * - fills in the mount root filehandle
1825 *
1826 * For option strings, user space handles the following behaviors:
1827 *
1828 * + DNS: mapping server host name to IP address ("addr=" option)
1829 *
1830 * + failure mode: how to behave if a mount request can't be handled
1831 * immediately ("fg/bg" option)
1832 *
1833 * + retry: how often to retry a mount request ("retry=" option)
1834 *
1835 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1836 * mountproto=tcp after mountproto=udp, and so on
1837 */
1838 static int nfs23_validate_mount_data(void *options,
1839 struct nfs_parsed_mount_data *args,
1840 struct nfs_fh *mntfh,
1841 const char *dev_name)
1842 {
1843 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1844 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1845
1846 if (data == NULL)
1847 goto out_no_data;
1848
1849 args->version = NFS_DEFAULT_VERSION;
1850 switch (data->version) {
1851 case 1:
1852 data->namlen = 0;
1853 case 2:
1854 data->bsize = 0;
1855 case 3:
1856 if (data->flags & NFS_MOUNT_VER3)
1857 goto out_no_v3;
1858 data->root.size = NFS2_FHSIZE;
1859 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1860 case 4:
1861 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1862 goto out_no_sec;
1863 case 5:
1864 memset(data->context, 0, sizeof(data->context));
1865 case 6:
1866 if (data->flags & NFS_MOUNT_VER3) {
1867 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1868 goto out_invalid_fh;
1869 mntfh->size = data->root.size;
1870 args->version = 3;
1871 } else {
1872 mntfh->size = NFS2_FHSIZE;
1873 args->version = 2;
1874 }
1875
1876
1877 memcpy(mntfh->data, data->root.data, mntfh->size);
1878 if (mntfh->size < sizeof(mntfh->data))
1879 memset(mntfh->data + mntfh->size, 0,
1880 sizeof(mntfh->data) - mntfh->size);
1881
1882 /*
1883 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1884 * can deal with.
1885 */
1886 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1887 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1888 args->rsize = data->rsize;
1889 args->wsize = data->wsize;
1890 args->timeo = data->timeo;
1891 args->retrans = data->retrans;
1892 args->acregmin = data->acregmin;
1893 args->acregmax = data->acregmax;
1894 args->acdirmin = data->acdirmin;
1895 args->acdirmax = data->acdirmax;
1896 args->need_mount = false;
1897
1898 memcpy(sap, &data->addr, sizeof(data->addr));
1899 args->nfs_server.addrlen = sizeof(data->addr);
1900 args->nfs_server.port = ntohs(data->addr.sin_port);
1901 if (!nfs_verify_server_address(sap))
1902 goto out_no_address;
1903
1904 if (!(data->flags & NFS_MOUNT_TCP))
1905 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1906 /* N.B. caller will free nfs_server.hostname in all cases */
1907 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1908 args->namlen = data->namlen;
1909 args->bsize = data->bsize;
1910
1911 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1912 args->auth_flavors[0] = data->pseudoflavor;
1913 if (!args->nfs_server.hostname)
1914 goto out_nomem;
1915
1916 if (!(data->flags & NFS_MOUNT_NONLM))
1917 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1918 NFS_MOUNT_LOCAL_FCNTL);
1919 else
1920 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1921 NFS_MOUNT_LOCAL_FCNTL);
1922 /*
1923 * The legacy version 6 binary mount data from userspace has a
1924 * field used only to transport selinux information into the
1925 * the kernel. To continue to support that functionality we
1926 * have a touch of selinux knowledge here in the NFS code. The
1927 * userspace code converted context=blah to just blah so we are
1928 * converting back to the full string selinux understands.
1929 */
1930 if (data->context[0]){
1931 #ifdef CONFIG_SECURITY_SELINUX
1932 int rc;
1933 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1934 if (!opts_str)
1935 return -ENOMEM;
1936 strcpy(opts_str, "context=");
1937 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1938 strcat(opts_str, &data->context[0]);
1939 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1940 kfree(opts_str);
1941 if (rc)
1942 return rc;
1943 #else
1944 return -EINVAL;
1945 #endif
1946 }
1947
1948 break;
1949 default:
1950 return NFS_TEXT_DATA;
1951 }
1952
1953 #if !IS_ENABLED(CONFIG_NFS_V3)
1954 if (args->version == 3)
1955 goto out_v3_not_compiled;
1956 #endif /* !CONFIG_NFS_V3 */
1957
1958 return 0;
1959
1960 out_no_data:
1961 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1962 return -EINVAL;
1963
1964 out_no_v3:
1965 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1966 data->version);
1967 return -EINVAL;
1968
1969 out_no_sec:
1970 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1971 return -EINVAL;
1972
1973 #if !IS_ENABLED(CONFIG_NFS_V3)
1974 out_v3_not_compiled:
1975 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1976 return -EPROTONOSUPPORT;
1977 #endif /* !CONFIG_NFS_V3 */
1978
1979 out_nomem:
1980 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1981 return -ENOMEM;
1982
1983 out_no_address:
1984 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1985 return -EINVAL;
1986
1987 out_invalid_fh:
1988 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1989 return -EINVAL;
1990 }
1991
1992 #if IS_ENABLED(CONFIG_NFS_V4)
1993 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1994 void *options,
1995 struct nfs_parsed_mount_data *args,
1996 struct nfs_fh *mntfh,
1997 const char *dev_name)
1998 {
1999 if (fs_type == &nfs_fs_type)
2000 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2001 return nfs4_validate_mount_data(options, args, dev_name);
2002 }
2003 #else
2004 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2005 void *options,
2006 struct nfs_parsed_mount_data *args,
2007 struct nfs_fh *mntfh,
2008 const char *dev_name)
2009 {
2010 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2011 }
2012 #endif
2013
2014 static int nfs_validate_text_mount_data(void *options,
2015 struct nfs_parsed_mount_data *args,
2016 const char *dev_name)
2017 {
2018 int port = 0;
2019 int max_namelen = PAGE_SIZE;
2020 int max_pathlen = NFS_MAXPATHLEN;
2021 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2022
2023 if (nfs_parse_mount_options((char *)options, args) == 0)
2024 return -EINVAL;
2025
2026 if (!nfs_verify_server_address(sap))
2027 goto out_no_address;
2028
2029 if (args->version == 4) {
2030 #if IS_ENABLED(CONFIG_NFS_V4)
2031 port = NFS_PORT;
2032 max_namelen = NFS4_MAXNAMLEN;
2033 max_pathlen = NFS4_MAXPATHLEN;
2034 nfs_validate_transport_protocol(args);
2035 nfs4_validate_mount_flags(args);
2036 #else
2037 goto out_v4_not_compiled;
2038 #endif /* CONFIG_NFS_V4 */
2039 } else
2040 nfs_set_mount_transport_protocol(args);
2041
2042 nfs_set_port(sap, &args->nfs_server.port, port);
2043
2044 if (args->auth_flavor_len > 1)
2045 goto out_bad_auth;
2046
2047 return nfs_parse_devname(dev_name,
2048 &args->nfs_server.hostname,
2049 max_namelen,
2050 &args->nfs_server.export_path,
2051 max_pathlen);
2052
2053 #if !IS_ENABLED(CONFIG_NFS_V4)
2054 out_v4_not_compiled:
2055 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2056 return -EPROTONOSUPPORT;
2057 #endif /* !CONFIG_NFS_V4 */
2058
2059 out_no_address:
2060 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2061 return -EINVAL;
2062
2063 out_bad_auth:
2064 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2065 return -EINVAL;
2066 }
2067
2068 static int
2069 nfs_compare_remount_data(struct nfs_server *nfss,
2070 struct nfs_parsed_mount_data *data)
2071 {
2072 if (data->flags != nfss->flags ||
2073 data->rsize != nfss->rsize ||
2074 data->wsize != nfss->wsize ||
2075 data->retrans != nfss->client->cl_timeout->to_retries ||
2076 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2077 data->acregmin != nfss->acregmin / HZ ||
2078 data->acregmax != nfss->acregmax / HZ ||
2079 data->acdirmin != nfss->acdirmin / HZ ||
2080 data->acdirmax != nfss->acdirmax / HZ ||
2081 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2082 data->nfs_server.port != nfss->port ||
2083 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2084 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2085 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2086 return -EINVAL;
2087
2088 return 0;
2089 }
2090
2091 int
2092 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2093 {
2094 int error;
2095 struct nfs_server *nfss = sb->s_fs_info;
2096 struct nfs_parsed_mount_data *data;
2097 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2098 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2099 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2100
2101 /*
2102 * Userspace mount programs that send binary options generally send
2103 * them populated with default values. We have no way to know which
2104 * ones were explicitly specified. Fall back to legacy behavior and
2105 * just return success.
2106 */
2107 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2108 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2109 options->version <= 6))))
2110 return 0;
2111
2112 data = kzalloc(sizeof(*data), GFP_KERNEL);
2113 if (data == NULL)
2114 return -ENOMEM;
2115
2116 /* fill out struct with values from existing mount */
2117 data->flags = nfss->flags;
2118 data->rsize = nfss->rsize;
2119 data->wsize = nfss->wsize;
2120 data->retrans = nfss->client->cl_timeout->to_retries;
2121 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2122 data->acregmin = nfss->acregmin / HZ;
2123 data->acregmax = nfss->acregmax / HZ;
2124 data->acdirmin = nfss->acdirmin / HZ;
2125 data->acdirmax = nfss->acdirmax / HZ;
2126 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2127 data->nfs_server.port = nfss->port;
2128 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2129 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2130 data->nfs_server.addrlen);
2131
2132 /* overwrite those values with any that were specified */
2133 error = nfs_parse_mount_options((char *)options, data);
2134 if (error < 0)
2135 goto out;
2136
2137 /*
2138 * noac is a special case. It implies -o sync, but that's not
2139 * necessarily reflected in the mtab options. do_remount_sb
2140 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2141 * remount options, so we have to explicitly reset it.
2142 */
2143 if (data->flags & NFS_MOUNT_NOAC)
2144 *flags |= MS_SYNCHRONOUS;
2145
2146 /* compare new mount options with old ones */
2147 error = nfs_compare_remount_data(nfss, data);
2148 out:
2149 kfree(data);
2150 return error;
2151 }
2152 EXPORT_SYMBOL_GPL(nfs_remount);
2153
2154 /*
2155 * Initialise the common bits of the superblock
2156 */
2157 inline void nfs_initialise_sb(struct super_block *sb)
2158 {
2159 struct nfs_server *server = NFS_SB(sb);
2160
2161 sb->s_magic = NFS_SUPER_MAGIC;
2162
2163 /* We probably want something more informative here */
2164 snprintf(sb->s_id, sizeof(sb->s_id),
2165 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2166
2167 if (sb->s_blocksize == 0)
2168 sb->s_blocksize = nfs_block_bits(server->wsize,
2169 &sb->s_blocksize_bits);
2170
2171 sb->s_bdi = &server->backing_dev_info;
2172
2173 nfs_super_set_maxbytes(sb, server->maxfilesize);
2174 }
2175
2176 /*
2177 * Finish setting up an NFS2/3 superblock
2178 */
2179 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2180 {
2181 struct nfs_parsed_mount_data *data = mount_info->parsed;
2182 struct nfs_server *server = NFS_SB(sb);
2183
2184 sb->s_blocksize_bits = 0;
2185 sb->s_blocksize = 0;
2186 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2187 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2188 if (data && data->bsize)
2189 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2190
2191 if (server->nfs_client->rpc_ops->version != 2) {
2192 /* The VFS shouldn't apply the umask to mode bits. We will do
2193 * so ourselves when necessary.
2194 */
2195 sb->s_flags |= MS_POSIXACL;
2196 sb->s_time_gran = 1;
2197 }
2198
2199 nfs_initialise_sb(sb);
2200 }
2201 EXPORT_SYMBOL_GPL(nfs_fill_super);
2202
2203 /*
2204 * Finish setting up a cloned NFS2/3/4 superblock
2205 */
2206 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2207 {
2208 const struct super_block *old_sb = mount_info->cloned->sb;
2209 struct nfs_server *server = NFS_SB(sb);
2210
2211 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2212 sb->s_blocksize = old_sb->s_blocksize;
2213 sb->s_maxbytes = old_sb->s_maxbytes;
2214 sb->s_xattr = old_sb->s_xattr;
2215 sb->s_op = old_sb->s_op;
2216 sb->s_time_gran = 1;
2217
2218 if (server->nfs_client->rpc_ops->version != 2) {
2219 /* The VFS shouldn't apply the umask to mode bits. We will do
2220 * so ourselves when necessary.
2221 */
2222 sb->s_flags |= MS_POSIXACL;
2223 }
2224
2225 nfs_initialise_sb(sb);
2226 }
2227
2228 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2229 {
2230 const struct nfs_server *a = s->s_fs_info;
2231 const struct rpc_clnt *clnt_a = a->client;
2232 const struct rpc_clnt *clnt_b = b->client;
2233
2234 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2235 goto Ebusy;
2236 if (a->nfs_client != b->nfs_client)
2237 goto Ebusy;
2238 if (a->flags != b->flags)
2239 goto Ebusy;
2240 if (a->wsize != b->wsize)
2241 goto Ebusy;
2242 if (a->rsize != b->rsize)
2243 goto Ebusy;
2244 if (a->acregmin != b->acregmin)
2245 goto Ebusy;
2246 if (a->acregmax != b->acregmax)
2247 goto Ebusy;
2248 if (a->acdirmin != b->acdirmin)
2249 goto Ebusy;
2250 if (a->acdirmax != b->acdirmax)
2251 goto Ebusy;
2252 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2253 goto Ebusy;
2254 return 1;
2255 Ebusy:
2256 return 0;
2257 }
2258
2259 struct nfs_sb_mountdata {
2260 struct nfs_server *server;
2261 int mntflags;
2262 };
2263
2264 static int nfs_set_super(struct super_block *s, void *data)
2265 {
2266 struct nfs_sb_mountdata *sb_mntdata = data;
2267 struct nfs_server *server = sb_mntdata->server;
2268 int ret;
2269
2270 s->s_flags = sb_mntdata->mntflags;
2271 s->s_fs_info = server;
2272 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2273 ret = set_anon_super(s, server);
2274 if (ret == 0)
2275 server->s_dev = s->s_dev;
2276 return ret;
2277 }
2278
2279 static int nfs_compare_super_address(struct nfs_server *server1,
2280 struct nfs_server *server2)
2281 {
2282 struct sockaddr *sap1, *sap2;
2283
2284 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2285 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2286
2287 if (sap1->sa_family != sap2->sa_family)
2288 return 0;
2289
2290 switch (sap1->sa_family) {
2291 case AF_INET: {
2292 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2293 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2294 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2295 return 0;
2296 if (sin1->sin_port != sin2->sin_port)
2297 return 0;
2298 break;
2299 }
2300 case AF_INET6: {
2301 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2302 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2303 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2304 return 0;
2305 if (sin1->sin6_port != sin2->sin6_port)
2306 return 0;
2307 break;
2308 }
2309 default:
2310 return 0;
2311 }
2312
2313 return 1;
2314 }
2315
2316 static int nfs_compare_super(struct super_block *sb, void *data)
2317 {
2318 struct nfs_sb_mountdata *sb_mntdata = data;
2319 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2320 int mntflags = sb_mntdata->mntflags;
2321
2322 if (!nfs_compare_super_address(old, server))
2323 return 0;
2324 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2325 if (old->flags & NFS_MOUNT_UNSHARED)
2326 return 0;
2327 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2328 return 0;
2329 return nfs_compare_mount_options(sb, server, mntflags);
2330 }
2331
2332 #ifdef CONFIG_NFS_FSCACHE
2333 static void nfs_get_cache_cookie(struct super_block *sb,
2334 struct nfs_parsed_mount_data *parsed,
2335 struct nfs_clone_mount *cloned)
2336 {
2337 struct nfs_server *nfss = NFS_SB(sb);
2338 char *uniq = NULL;
2339 int ulen = 0;
2340
2341 nfss->fscache_key = NULL;
2342 nfss->fscache = NULL;
2343
2344 if (parsed) {
2345 if (!(parsed->options & NFS_OPTION_FSCACHE))
2346 return;
2347 if (parsed->fscache_uniq) {
2348 uniq = parsed->fscache_uniq;
2349 ulen = strlen(parsed->fscache_uniq);
2350 }
2351 } else if (cloned) {
2352 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2353 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2354 return;
2355 if (mnt_s->fscache_key) {
2356 uniq = mnt_s->fscache_key->key.uniquifier;
2357 ulen = mnt_s->fscache_key->key.uniq_len;
2358 };
2359 } else
2360 return;
2361
2362 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2363 }
2364 #else
2365 static void nfs_get_cache_cookie(struct super_block *sb,
2366 struct nfs_parsed_mount_data *parsed,
2367 struct nfs_clone_mount *cloned)
2368 {
2369 }
2370 #endif
2371
2372 static int nfs_bdi_register(struct nfs_server *server)
2373 {
2374 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2375 }
2376
2377 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2378 struct nfs_mount_info *mount_info)
2379 {
2380 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2381 }
2382 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2383
2384 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2385 struct nfs_mount_info *mount_info)
2386 {
2387 /* clone any lsm security options from the parent to the new sb */
2388 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2389 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2390 return -ESTALE;
2391 return 0;
2392 }
2393 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2394
2395 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2396 int flags, const char *dev_name,
2397 struct nfs_mount_info *mount_info,
2398 struct nfs_subversion *nfs_mod)
2399 {
2400 struct super_block *s;
2401 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2402 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2403 struct nfs_sb_mountdata sb_mntdata = {
2404 .mntflags = flags,
2405 .server = server,
2406 };
2407 int error;
2408
2409 if (server->flags & NFS_MOUNT_UNSHARED)
2410 compare_super = NULL;
2411
2412 /* -o noac implies -o sync */
2413 if (server->flags & NFS_MOUNT_NOAC)
2414 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2415
2416 /* Get a superblock - note that we may end up sharing one that already exists */
2417 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2418 if (IS_ERR(s)) {
2419 mntroot = ERR_CAST(s);
2420 goto out_err_nosb;
2421 }
2422
2423 if (s->s_fs_info != server) {
2424 nfs_free_server(server);
2425 server = NULL;
2426 } else {
2427 error = nfs_bdi_register(server);
2428 if (error) {
2429 mntroot = ERR_PTR(error);
2430 goto error_splat_bdi;
2431 }
2432 }
2433
2434 if (!s->s_root) {
2435 /* initial superblock/root creation */
2436 mount_info->fill_super(s, mount_info);
2437 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2438 }
2439
2440 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2441 if (IS_ERR(mntroot))
2442 goto error_splat_super;
2443
2444 error = mount_info->set_security(s, mntroot, mount_info);
2445 if (error)
2446 goto error_splat_root;
2447
2448 s->s_flags |= MS_ACTIVE;
2449
2450 out:
2451 return mntroot;
2452
2453 out_err_nosb:
2454 nfs_free_server(server);
2455 goto out;
2456
2457 error_splat_root:
2458 dput(mntroot);
2459 mntroot = ERR_PTR(error);
2460 error_splat_super:
2461 if (server && !s->s_root)
2462 bdi_unregister(&server->backing_dev_info);
2463 error_splat_bdi:
2464 deactivate_locked_super(s);
2465 goto out;
2466 }
2467 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2468
2469 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2470 int flags, const char *dev_name, void *raw_data)
2471 {
2472 struct nfs_mount_info mount_info = {
2473 .fill_super = nfs_fill_super,
2474 .set_security = nfs_set_sb_security,
2475 };
2476 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2477 struct nfs_subversion *nfs_mod;
2478 int error;
2479
2480 mount_info.parsed = nfs_alloc_parsed_mount_data();
2481 mount_info.mntfh = nfs_alloc_fhandle();
2482 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2483 goto out;
2484
2485 /* Validate the mount data */
2486 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2487 if (error == NFS_TEXT_DATA)
2488 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2489 if (error < 0) {
2490 mntroot = ERR_PTR(error);
2491 goto out;
2492 }
2493
2494 nfs_mod = get_nfs_version(mount_info.parsed->version);
2495 if (IS_ERR(nfs_mod)) {
2496 mntroot = ERR_CAST(nfs_mod);
2497 goto out;
2498 }
2499
2500 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2501
2502 put_nfs_version(nfs_mod);
2503 out:
2504 nfs_free_parsed_mount_data(mount_info.parsed);
2505 nfs_free_fhandle(mount_info.mntfh);
2506 return mntroot;
2507 }
2508 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2509
2510 /*
2511 * Ensure that we unregister the bdi before kill_anon_super
2512 * releases the device name
2513 */
2514 void nfs_put_super(struct super_block *s)
2515 {
2516 struct nfs_server *server = NFS_SB(s);
2517
2518 bdi_unregister(&server->backing_dev_info);
2519 }
2520 EXPORT_SYMBOL_GPL(nfs_put_super);
2521
2522 /*
2523 * Destroy an NFS2/3 superblock
2524 */
2525 void nfs_kill_super(struct super_block *s)
2526 {
2527 struct nfs_server *server = NFS_SB(s);
2528
2529 kill_anon_super(s);
2530 nfs_fscache_release_super_cookie(s);
2531 nfs_free_server(server);
2532 }
2533 EXPORT_SYMBOL_GPL(nfs_kill_super);
2534
2535 /*
2536 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2537 */
2538 static struct dentry *
2539 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2540 const char *dev_name, void *raw_data)
2541 {
2542 struct nfs_clone_mount *data = raw_data;
2543 struct nfs_mount_info mount_info = {
2544 .fill_super = nfs_clone_super,
2545 .set_security = nfs_clone_sb_security,
2546 .cloned = data,
2547 };
2548 struct nfs_server *server;
2549 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2550 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2551
2552 dprintk("--> nfs_xdev_mount()\n");
2553
2554 mount_info.mntfh = mount_info.cloned->fh;
2555
2556 /* create a new volume representation */
2557 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2558
2559 if (IS_ERR(server))
2560 mntroot = ERR_CAST(server);
2561 else
2562 mntroot = nfs_fs_mount_common(server, flags,
2563 dev_name, &mount_info, nfs_mod);
2564
2565 dprintk("<-- nfs_xdev_mount() = %ld\n",
2566 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2567 return mntroot;
2568 }
2569
2570 #if IS_ENABLED(CONFIG_NFS_V4)
2571
2572 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2573 {
2574 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2575 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2576 }
2577
2578 /*
2579 * Validate NFSv4 mount options
2580 */
2581 static int nfs4_validate_mount_data(void *options,
2582 struct nfs_parsed_mount_data *args,
2583 const char *dev_name)
2584 {
2585 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2586 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2587 char *c;
2588
2589 if (data == NULL)
2590 goto out_no_data;
2591
2592 args->version = 4;
2593
2594 switch (data->version) {
2595 case 1:
2596 if (data->host_addrlen > sizeof(args->nfs_server.address))
2597 goto out_no_address;
2598 if (data->host_addrlen == 0)
2599 goto out_no_address;
2600 args->nfs_server.addrlen = data->host_addrlen;
2601 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2602 return -EFAULT;
2603 if (!nfs_verify_server_address(sap))
2604 goto out_no_address;
2605 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2606
2607 if (data->auth_flavourlen) {
2608 if (data->auth_flavourlen > 1)
2609 goto out_inval_auth;
2610 if (copy_from_user(&args->auth_flavors[0],
2611 data->auth_flavours,
2612 sizeof(args->auth_flavors[0])))
2613 return -EFAULT;
2614 }
2615
2616 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2617 if (IS_ERR(c))
2618 return PTR_ERR(c);
2619 args->nfs_server.hostname = c;
2620
2621 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2622 if (IS_ERR(c))
2623 return PTR_ERR(c);
2624 args->nfs_server.export_path = c;
2625 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2626
2627 c = strndup_user(data->client_addr.data, 16);
2628 if (IS_ERR(c))
2629 return PTR_ERR(c);
2630 args->client_address = c;
2631
2632 /*
2633 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2634 * can deal with.
2635 */
2636
2637 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2638 args->rsize = data->rsize;
2639 args->wsize = data->wsize;
2640 args->timeo = data->timeo;
2641 args->retrans = data->retrans;
2642 args->acregmin = data->acregmin;
2643 args->acregmax = data->acregmax;
2644 args->acdirmin = data->acdirmin;
2645 args->acdirmax = data->acdirmax;
2646 args->nfs_server.protocol = data->proto;
2647 nfs_validate_transport_protocol(args);
2648
2649 break;
2650 default:
2651 return NFS_TEXT_DATA;
2652 }
2653
2654 return 0;
2655
2656 out_no_data:
2657 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2658 return -EINVAL;
2659
2660 out_inval_auth:
2661 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2662 data->auth_flavourlen);
2663 return -EINVAL;
2664
2665 out_no_address:
2666 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2667 return -EINVAL;
2668 }
2669
2670 /*
2671 * NFS v4 module parameters need to stay in the
2672 * NFS client for backwards compatibility
2673 */
2674 unsigned int nfs_callback_set_tcpport;
2675 unsigned short nfs_callback_tcpport;
2676 /* Default cache timeout is 10 minutes */
2677 unsigned int nfs_idmap_cache_timeout = 600;
2678 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2679 bool nfs4_disable_idmapping = true;
2680 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2681 unsigned short send_implementation_id = 1;
2682 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2683
2684 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2685 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2686 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2687 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2688 EXPORT_SYMBOL_GPL(max_session_slots);
2689 EXPORT_SYMBOL_GPL(send_implementation_id);
2690 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2691
2692 #define NFS_CALLBACK_MAXPORTNR (65535U)
2693
2694 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2695 {
2696 unsigned long num;
2697 int ret;
2698
2699 if (!val)
2700 return -EINVAL;
2701 ret = kstrtoul(val, 0, &num);
2702 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2703 return -EINVAL;
2704 *((unsigned int *)kp->arg) = num;
2705 return 0;
2706 }
2707 static struct kernel_param_ops param_ops_portnr = {
2708 .set = param_set_portnr,
2709 .get = param_get_uint,
2710 };
2711 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2712
2713 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2714 module_param(nfs_idmap_cache_timeout, int, 0644);
2715 module_param(nfs4_disable_idmapping, bool, 0644);
2716 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2717 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2718 MODULE_PARM_DESC(nfs4_disable_idmapping,
2719 "Turn off NFSv4 idmapping when using 'sec=sys'");
2720 module_param(max_session_slots, ushort, 0644);
2721 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2722 "requests the client will negotiate");
2723 module_param(send_implementation_id, ushort, 0644);
2724 MODULE_PARM_DESC(send_implementation_id,
2725 "Send implementation ID with NFSv4.1 exchange_id");
2726 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2727
2728 #endif /* CONFIG_NFS_V4 */
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