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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[mirror_ubuntu-bionic-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, Opt_vers_4_2,
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 { Opt_vers_4_2, "4.2" },
284
285 { Opt_vers_err, NULL }
286 };
287
288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data);
290
291 struct file_system_type nfs_fs_type = {
292 .owner = THIS_MODULE,
293 .name = "nfs",
294 .mount = nfs_fs_mount,
295 .kill_sb = nfs_kill_super,
296 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
297 };
298 MODULE_ALIAS_FS("nfs");
299 EXPORT_SYMBOL_GPL(nfs_fs_type);
300
301 struct file_system_type nfs_xdev_fs_type = {
302 .owner = THIS_MODULE,
303 .name = "nfs",
304 .mount = nfs_xdev_mount,
305 .kill_sb = nfs_kill_super,
306 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
307 };
308
309 const struct super_operations nfs_sops = {
310 .alloc_inode = nfs_alloc_inode,
311 .destroy_inode = nfs_destroy_inode,
312 .write_inode = nfs_write_inode,
313 .drop_inode = nfs_drop_inode,
314 .put_super = nfs_put_super,
315 .statfs = nfs_statfs,
316 .evict_inode = nfs_evict_inode,
317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
321 .show_stats = nfs_show_stats,
322 .remount_fs = nfs_remount,
323 };
324 EXPORT_SYMBOL_GPL(nfs_sops);
325
326 #if IS_ENABLED(CONFIG_NFS_V4)
327 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
328 static int nfs4_validate_mount_data(void *options,
329 struct nfs_parsed_mount_data *args, const char *dev_name);
330
331 struct file_system_type nfs4_fs_type = {
332 .owner = THIS_MODULE,
333 .name = "nfs4",
334 .mount = nfs_fs_mount,
335 .kill_sb = nfs_kill_super,
336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
337 };
338 MODULE_ALIAS_FS("nfs4");
339 MODULE_ALIAS("nfs4");
340 EXPORT_SYMBOL_GPL(nfs4_fs_type);
341
342 static int __init register_nfs4_fs(void)
343 {
344 return register_filesystem(&nfs4_fs_type);
345 }
346
347 static void unregister_nfs4_fs(void)
348 {
349 unregister_filesystem(&nfs4_fs_type);
350 }
351 #else
352 static int __init register_nfs4_fs(void)
353 {
354 return 0;
355 }
356
357 static void unregister_nfs4_fs(void)
358 {
359 }
360 #endif
361
362 static struct shrinker acl_shrinker = {
363 .count_objects = nfs_access_cache_count,
364 .scan_objects = nfs_access_cache_scan,
365 .seeks = DEFAULT_SEEKS,
366 };
367
368 /*
369 * Register the NFS filesystems
370 */
371 int __init register_nfs_fs(void)
372 {
373 int ret;
374
375 ret = register_filesystem(&nfs_fs_type);
376 if (ret < 0)
377 goto error_0;
378
379 ret = register_nfs4_fs();
380 if (ret < 0)
381 goto error_1;
382
383 ret = nfs_register_sysctl();
384 if (ret < 0)
385 goto error_2;
386 register_shrinker(&acl_shrinker);
387 return 0;
388
389 error_2:
390 unregister_nfs4_fs();
391 error_1:
392 unregister_filesystem(&nfs_fs_type);
393 error_0:
394 return ret;
395 }
396
397 /*
398 * Unregister the NFS filesystems
399 */
400 void __exit unregister_nfs_fs(void)
401 {
402 unregister_shrinker(&acl_shrinker);
403 nfs_unregister_sysctl();
404 unregister_nfs4_fs();
405 unregister_filesystem(&nfs_fs_type);
406 }
407
408 void nfs_sb_active(struct super_block *sb)
409 {
410 struct nfs_server *server = NFS_SB(sb);
411
412 if (atomic_inc_return(&server->active) == 1)
413 atomic_inc(&sb->s_active);
414 }
415 EXPORT_SYMBOL_GPL(nfs_sb_active);
416
417 void nfs_sb_deactive(struct super_block *sb)
418 {
419 struct nfs_server *server = NFS_SB(sb);
420
421 if (atomic_dec_and_test(&server->active))
422 deactivate_super(sb);
423 }
424 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
425
426 /*
427 * Deliver file system statistics to userspace
428 */
429 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
430 {
431 struct nfs_server *server = NFS_SB(dentry->d_sb);
432 unsigned char blockbits;
433 unsigned long blockres;
434 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
435 struct nfs_fsstat res;
436 int error = -ENOMEM;
437
438 res.fattr = nfs_alloc_fattr();
439 if (res.fattr == NULL)
440 goto out_err;
441
442 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
443 if (unlikely(error == -ESTALE)) {
444 struct dentry *pd_dentry;
445
446 pd_dentry = dget_parent(dentry);
447 if (pd_dentry != NULL) {
448 nfs_zap_caches(pd_dentry->d_inode);
449 dput(pd_dentry);
450 }
451 }
452 nfs_free_fattr(res.fattr);
453 if (error < 0)
454 goto out_err;
455
456 buf->f_type = NFS_SUPER_MAGIC;
457
458 /*
459 * Current versions of glibc do not correctly handle the
460 * case where f_frsize != f_bsize. Eventually we want to
461 * report the value of wtmult in this field.
462 */
463 buf->f_frsize = dentry->d_sb->s_blocksize;
464
465 /*
466 * On most *nix systems, f_blocks, f_bfree, and f_bavail
467 * are reported in units of f_frsize. Linux hasn't had
468 * an f_frsize field in its statfs struct until recently,
469 * thus historically Linux's sys_statfs reports these
470 * fields in units of f_bsize.
471 */
472 buf->f_bsize = dentry->d_sb->s_blocksize;
473 blockbits = dentry->d_sb->s_blocksize_bits;
474 blockres = (1 << blockbits) - 1;
475 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
476 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
477 buf->f_bavail = (res.abytes + blockres) >> blockbits;
478
479 buf->f_files = res.tfiles;
480 buf->f_ffree = res.afiles;
481
482 buf->f_namelen = server->namelen;
483
484 return 0;
485
486 out_err:
487 dprintk("%s: statfs error = %d\n", __func__, -error);
488 return error;
489 }
490 EXPORT_SYMBOL_GPL(nfs_statfs);
491
492 /*
493 * Map the security flavour number to a name
494 */
495 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
496 {
497 static const struct {
498 rpc_authflavor_t flavour;
499 const char *str;
500 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
501 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
502 { RPC_AUTH_NULL, "null" },
503 { RPC_AUTH_UNIX, "sys" },
504 { RPC_AUTH_GSS_KRB5, "krb5" },
505 { RPC_AUTH_GSS_KRB5I, "krb5i" },
506 { RPC_AUTH_GSS_KRB5P, "krb5p" },
507 { RPC_AUTH_GSS_LKEY, "lkey" },
508 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
509 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
510 { RPC_AUTH_GSS_SPKM, "spkm" },
511 { RPC_AUTH_GSS_SPKMI, "spkmi" },
512 { RPC_AUTH_GSS_SPKMP, "spkmp" },
513 { UINT_MAX, "unknown" }
514 };
515 int i;
516
517 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
518 if (sec_flavours[i].flavour == flavour)
519 break;
520 }
521 return sec_flavours[i].str;
522 }
523
524 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
525 int showdefaults)
526 {
527 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
528
529 seq_printf(m, ",mountproto=");
530 switch (sap->sa_family) {
531 case AF_INET:
532 switch (nfss->mountd_protocol) {
533 case IPPROTO_UDP:
534 seq_printf(m, RPCBIND_NETID_UDP);
535 break;
536 case IPPROTO_TCP:
537 seq_printf(m, RPCBIND_NETID_TCP);
538 break;
539 default:
540 if (showdefaults)
541 seq_printf(m, "auto");
542 }
543 break;
544 case AF_INET6:
545 switch (nfss->mountd_protocol) {
546 case IPPROTO_UDP:
547 seq_printf(m, RPCBIND_NETID_UDP6);
548 break;
549 case IPPROTO_TCP:
550 seq_printf(m, RPCBIND_NETID_TCP6);
551 break;
552 default:
553 if (showdefaults)
554 seq_printf(m, "auto");
555 }
556 break;
557 default:
558 if (showdefaults)
559 seq_printf(m, "auto");
560 }
561 }
562
563 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
564 int showdefaults)
565 {
566 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
567
568 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
569 return;
570
571 switch (sap->sa_family) {
572 case AF_INET: {
573 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
574 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
575 break;
576 }
577 case AF_INET6: {
578 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
579 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
580 break;
581 }
582 default:
583 if (showdefaults)
584 seq_printf(m, ",mountaddr=unspecified");
585 }
586
587 if (nfss->mountd_version || showdefaults)
588 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
589 if ((nfss->mountd_port &&
590 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
591 showdefaults)
592 seq_printf(m, ",mountport=%u", nfss->mountd_port);
593
594 nfs_show_mountd_netid(m, nfss, showdefaults);
595 }
596
597 #if IS_ENABLED(CONFIG_NFS_V4)
598 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
599 int showdefaults)
600 {
601 struct nfs_client *clp = nfss->nfs_client;
602
603 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
604 }
605 #else
606 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
607 int showdefaults)
608 {
609 }
610 #endif
611
612 static void nfs_show_nfs_version(struct seq_file *m,
613 unsigned int version,
614 unsigned int minorversion)
615 {
616 seq_printf(m, ",vers=%u", version);
617 if (version == 4)
618 seq_printf(m, ".%u", minorversion);
619 }
620
621 /*
622 * Describe the mount options in force on this server representation
623 */
624 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
625 int showdefaults)
626 {
627 static const struct proc_nfs_info {
628 int flag;
629 const char *str;
630 const char *nostr;
631 } nfs_info[] = {
632 { NFS_MOUNT_SOFT, ",soft", ",hard" },
633 { NFS_MOUNT_POSIX, ",posix", "" },
634 { NFS_MOUNT_NOCTO, ",nocto", "" },
635 { NFS_MOUNT_NOAC, ",noac", "" },
636 { NFS_MOUNT_NONLM, ",nolock", "" },
637 { NFS_MOUNT_NOACL, ",noacl", "" },
638 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
639 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
640 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
641 { 0, NULL, NULL }
642 };
643 const struct proc_nfs_info *nfs_infop;
644 struct nfs_client *clp = nfss->nfs_client;
645 u32 version = clp->rpc_ops->version;
646 int local_flock, local_fcntl;
647
648 nfs_show_nfs_version(m, version, clp->cl_minorversion);
649 seq_printf(m, ",rsize=%u", nfss->rsize);
650 seq_printf(m, ",wsize=%u", nfss->wsize);
651 if (nfss->bsize != 0)
652 seq_printf(m, ",bsize=%u", nfss->bsize);
653 seq_printf(m, ",namlen=%u", nfss->namelen);
654 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
655 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
656 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
657 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
658 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
659 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
660 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
661 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
662 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
663 if (nfss->flags & nfs_infop->flag)
664 seq_puts(m, nfs_infop->str);
665 else
666 seq_puts(m, nfs_infop->nostr);
667 }
668 rcu_read_lock();
669 seq_printf(m, ",proto=%s",
670 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
671 rcu_read_unlock();
672 if (version == 4) {
673 if (nfss->port != NFS_PORT)
674 seq_printf(m, ",port=%u", nfss->port);
675 } else
676 if (nfss->port)
677 seq_printf(m, ",port=%u", nfss->port);
678
679 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
680 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
681 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
682
683 if (version != 4)
684 nfs_show_mountd_options(m, nfss, showdefaults);
685 else
686 nfs_show_nfsv4_options(m, nfss, showdefaults);
687
688 if (nfss->options & NFS_OPTION_FSCACHE)
689 seq_printf(m, ",fsc");
690
691 if (nfss->options & NFS_OPTION_MIGRATION)
692 seq_printf(m, ",migration");
693
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
695 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
696 seq_printf(m, ",lookupcache=none");
697 else
698 seq_printf(m, ",lookupcache=pos");
699 }
700
701 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
702 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
703
704 if (!local_flock && !local_fcntl)
705 seq_printf(m, ",local_lock=none");
706 else if (local_flock && local_fcntl)
707 seq_printf(m, ",local_lock=all");
708 else if (local_flock)
709 seq_printf(m, ",local_lock=flock");
710 else
711 seq_printf(m, ",local_lock=posix");
712 }
713
714 /*
715 * Describe the mount options on this VFS mountpoint
716 */
717 int nfs_show_options(struct seq_file *m, struct dentry *root)
718 {
719 struct nfs_server *nfss = NFS_SB(root->d_sb);
720
721 nfs_show_mount_options(m, nfss, 0);
722
723 rcu_read_lock();
724 seq_printf(m, ",addr=%s",
725 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
726 RPC_DISPLAY_ADDR));
727 rcu_read_unlock();
728
729 return 0;
730 }
731 EXPORT_SYMBOL_GPL(nfs_show_options);
732
733 #if IS_ENABLED(CONFIG_NFS_V4)
734 #ifdef CONFIG_NFS_V4_1
735 static void show_sessions(struct seq_file *m, struct nfs_server *server)
736 {
737 if (nfs4_has_session(server->nfs_client))
738 seq_printf(m, ",sessions");
739 }
740 #else
741 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
742 #endif
743 #endif
744
745 #ifdef CONFIG_NFS_V4_1
746 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
747 {
748 seq_printf(m, ",pnfs=");
749 if (server->pnfs_curr_ld)
750 seq_printf(m, "%s", server->pnfs_curr_ld->name);
751 else
752 seq_printf(m, "not configured");
753 }
754
755 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
756 {
757 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
758 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
759 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
760 "date='%llu,%u'",
761 impl_id->name, impl_id->domain,
762 impl_id->date.seconds, impl_id->date.nseconds);
763 }
764 }
765 #else
766 #if IS_ENABLED(CONFIG_NFS_V4)
767 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
768 {
769 }
770 #endif
771 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
772 {
773 }
774 #endif
775
776 int nfs_show_devname(struct seq_file *m, struct dentry *root)
777 {
778 char *page = (char *) __get_free_page(GFP_KERNEL);
779 char *devname, *dummy;
780 int err = 0;
781 if (!page)
782 return -ENOMEM;
783 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
784 if (IS_ERR(devname))
785 err = PTR_ERR(devname);
786 else
787 seq_escape(m, devname, " \t\n\\");
788 free_page((unsigned long)page);
789 return err;
790 }
791 EXPORT_SYMBOL_GPL(nfs_show_devname);
792
793 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
794 {
795 seq_puts(m, "/");
796 return 0;
797 }
798 EXPORT_SYMBOL_GPL(nfs_show_path);
799
800 /*
801 * Present statistical information for this VFS mountpoint
802 */
803 int nfs_show_stats(struct seq_file *m, struct dentry *root)
804 {
805 int i, cpu;
806 struct nfs_server *nfss = NFS_SB(root->d_sb);
807 struct rpc_auth *auth = nfss->client->cl_auth;
808 struct nfs_iostats totals = { };
809
810 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
811
812 /*
813 * Display all mount option settings
814 */
815 seq_printf(m, "\n\topts:\t");
816 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
817 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
818 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
819 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
820 nfs_show_mount_options(m, nfss, 1);
821
822 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
823
824 show_implementation_id(m, nfss);
825
826 seq_printf(m, "\n\tcaps:\t");
827 seq_printf(m, "caps=0x%x", nfss->caps);
828 seq_printf(m, ",wtmult=%u", nfss->wtmult);
829 seq_printf(m, ",dtsize=%u", nfss->dtsize);
830 seq_printf(m, ",bsize=%u", nfss->bsize);
831 seq_printf(m, ",namlen=%u", nfss->namelen);
832
833 #if IS_ENABLED(CONFIG_NFS_V4)
834 if (nfss->nfs_client->rpc_ops->version == 4) {
835 seq_printf(m, "\n\tnfsv4:\t");
836 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
837 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
838 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
839 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
840 show_sessions(m, nfss);
841 show_pnfs(m, nfss);
842 }
843 #endif
844
845 /*
846 * Display security flavor in effect for this mount
847 */
848 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
849 if (auth->au_flavor)
850 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
851
852 /*
853 * Display superblock I/O counters
854 */
855 for_each_possible_cpu(cpu) {
856 struct nfs_iostats *stats;
857
858 preempt_disable();
859 stats = per_cpu_ptr(nfss->io_stats, cpu);
860
861 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
862 totals.events[i] += stats->events[i];
863 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
864 totals.bytes[i] += stats->bytes[i];
865 #ifdef CONFIG_NFS_FSCACHE
866 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
867 totals.fscache[i] += stats->fscache[i];
868 #endif
869
870 preempt_enable();
871 }
872
873 seq_printf(m, "\n\tevents:\t");
874 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
875 seq_printf(m, "%lu ", totals.events[i]);
876 seq_printf(m, "\n\tbytes:\t");
877 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
878 seq_printf(m, "%Lu ", totals.bytes[i]);
879 #ifdef CONFIG_NFS_FSCACHE
880 if (nfss->options & NFS_OPTION_FSCACHE) {
881 seq_printf(m, "\n\tfsc:\t");
882 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
883 seq_printf(m, "%Lu ", totals.bytes[i]);
884 }
885 #endif
886 seq_printf(m, "\n");
887
888 rpc_print_iostats(m, nfss->client);
889
890 return 0;
891 }
892 EXPORT_SYMBOL_GPL(nfs_show_stats);
893
894 /*
895 * Begin unmount by attempting to remove all automounted mountpoints we added
896 * in response to xdev traversals and referrals
897 */
898 void nfs_umount_begin(struct super_block *sb)
899 {
900 struct nfs_server *server;
901 struct rpc_clnt *rpc;
902
903 server = NFS_SB(sb);
904 /* -EIO all pending I/O */
905 rpc = server->client_acl;
906 if (!IS_ERR(rpc))
907 rpc_killall_tasks(rpc);
908 rpc = server->client;
909 if (!IS_ERR(rpc))
910 rpc_killall_tasks(rpc);
911 }
912 EXPORT_SYMBOL_GPL(nfs_umount_begin);
913
914 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
915 {
916 struct nfs_parsed_mount_data *data;
917
918 data = kzalloc(sizeof(*data), GFP_KERNEL);
919 if (data) {
920 data->acregmin = NFS_DEF_ACREGMIN;
921 data->acregmax = NFS_DEF_ACREGMAX;
922 data->acdirmin = NFS_DEF_ACDIRMIN;
923 data->acdirmax = NFS_DEF_ACDIRMAX;
924 data->mount_server.port = NFS_UNSPEC_PORT;
925 data->nfs_server.port = NFS_UNSPEC_PORT;
926 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
927 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
928 data->minorversion = 0;
929 data->need_mount = true;
930 data->net = current->nsproxy->net_ns;
931 security_init_mnt_opts(&data->lsm_opts);
932 }
933 return data;
934 }
935
936 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
937 {
938 if (data) {
939 kfree(data->client_address);
940 kfree(data->mount_server.hostname);
941 kfree(data->nfs_server.export_path);
942 kfree(data->nfs_server.hostname);
943 kfree(data->fscache_uniq);
944 security_free_mnt_opts(&data->lsm_opts);
945 kfree(data);
946 }
947 }
948
949 /*
950 * Sanity-check a server address provided by the mount command.
951 *
952 * Address family must be initialized, and address must not be
953 * the ANY address for that family.
954 */
955 static int nfs_verify_server_address(struct sockaddr *addr)
956 {
957 switch (addr->sa_family) {
958 case AF_INET: {
959 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
960 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
961 }
962 case AF_INET6: {
963 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
964 return !ipv6_addr_any(sa);
965 }
966 }
967
968 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
969 return 0;
970 }
971
972 /*
973 * Select between a default port value and a user-specified port value.
974 * If a zero value is set, then autobind will be used.
975 */
976 static void nfs_set_port(struct sockaddr *sap, int *port,
977 const unsigned short default_port)
978 {
979 if (*port == NFS_UNSPEC_PORT)
980 *port = default_port;
981
982 rpc_set_port(sap, *port);
983 }
984
985 /*
986 * Sanity check the NFS transport protocol.
987 *
988 */
989 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
990 {
991 switch (mnt->nfs_server.protocol) {
992 case XPRT_TRANSPORT_UDP:
993 case XPRT_TRANSPORT_TCP:
994 case XPRT_TRANSPORT_RDMA:
995 break;
996 default:
997 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
998 }
999 }
1000
1001 /*
1002 * For text based NFSv2/v3 mounts, the mount protocol transport default
1003 * settings should depend upon the specified NFS transport.
1004 */
1005 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1006 {
1007 nfs_validate_transport_protocol(mnt);
1008
1009 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1010 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1011 return;
1012 switch (mnt->nfs_server.protocol) {
1013 case XPRT_TRANSPORT_UDP:
1014 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1015 break;
1016 case XPRT_TRANSPORT_TCP:
1017 case XPRT_TRANSPORT_RDMA:
1018 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1019 }
1020 }
1021
1022 /*
1023 * Add 'flavor' to 'auth_info' if not already present.
1024 * Returns true if 'flavor' ends up in the list, false otherwise
1025 */
1026 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1027 rpc_authflavor_t flavor)
1028 {
1029 unsigned int i;
1030 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1031
1032 /* make sure this flavor isn't already in the list */
1033 for (i = 0; i < auth_info->flavor_len; i++) {
1034 if (flavor == auth_info->flavors[i])
1035 return true;
1036 }
1037
1038 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1039 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1040 return false;
1041 }
1042
1043 auth_info->flavors[auth_info->flavor_len++] = flavor;
1044 return true;
1045 }
1046
1047 /*
1048 * Return true if 'match' is in auth_info or auth_info is empty.
1049 * Return false otherwise.
1050 */
1051 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1052 rpc_authflavor_t match)
1053 {
1054 int i;
1055
1056 if (!auth_info->flavor_len)
1057 return true;
1058
1059 for (i = 0; i < auth_info->flavor_len; i++) {
1060 if (auth_info->flavors[i] == match)
1061 return true;
1062 }
1063 return false;
1064 }
1065 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1066
1067 /*
1068 * Parse the value of the 'sec=' option.
1069 */
1070 static int nfs_parse_security_flavors(char *value,
1071 struct nfs_parsed_mount_data *mnt)
1072 {
1073 substring_t args[MAX_OPT_ARGS];
1074 rpc_authflavor_t pseudoflavor;
1075 char *p;
1076
1077 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1078
1079 while ((p = strsep(&value, ":")) != NULL) {
1080 switch (match_token(p, nfs_secflavor_tokens, args)) {
1081 case Opt_sec_none:
1082 pseudoflavor = RPC_AUTH_NULL;
1083 break;
1084 case Opt_sec_sys:
1085 pseudoflavor = RPC_AUTH_UNIX;
1086 break;
1087 case Opt_sec_krb5:
1088 pseudoflavor = RPC_AUTH_GSS_KRB5;
1089 break;
1090 case Opt_sec_krb5i:
1091 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1092 break;
1093 case Opt_sec_krb5p:
1094 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1095 break;
1096 case Opt_sec_lkey:
1097 pseudoflavor = RPC_AUTH_GSS_LKEY;
1098 break;
1099 case Opt_sec_lkeyi:
1100 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1101 break;
1102 case Opt_sec_lkeyp:
1103 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1104 break;
1105 case Opt_sec_spkm:
1106 pseudoflavor = RPC_AUTH_GSS_SPKM;
1107 break;
1108 case Opt_sec_spkmi:
1109 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1110 break;
1111 case Opt_sec_spkmp:
1112 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1113 break;
1114 default:
1115 dfprintk(MOUNT,
1116 "NFS: sec= option '%s' not recognized\n", p);
1117 return 0;
1118 }
1119
1120 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1121 return 0;
1122 }
1123
1124 return 1;
1125 }
1126
1127 static int nfs_parse_version_string(char *string,
1128 struct nfs_parsed_mount_data *mnt,
1129 substring_t *args)
1130 {
1131 mnt->flags &= ~NFS_MOUNT_VER3;
1132 switch (match_token(string, nfs_vers_tokens, args)) {
1133 case Opt_vers_2:
1134 mnt->version = 2;
1135 break;
1136 case Opt_vers_3:
1137 mnt->flags |= NFS_MOUNT_VER3;
1138 mnt->version = 3;
1139 break;
1140 case Opt_vers_4:
1141 /* Backward compatibility option. In future,
1142 * the mount program should always supply
1143 * a NFSv4 minor version number.
1144 */
1145 mnt->version = 4;
1146 break;
1147 case Opt_vers_4_0:
1148 mnt->version = 4;
1149 mnt->minorversion = 0;
1150 break;
1151 case Opt_vers_4_1:
1152 mnt->version = 4;
1153 mnt->minorversion = 1;
1154 break;
1155 case Opt_vers_4_2:
1156 mnt->version = 4;
1157 mnt->minorversion = 2;
1158 break;
1159 default:
1160 return 0;
1161 }
1162 return 1;
1163 }
1164
1165 static int nfs_get_option_str(substring_t args[], char **option)
1166 {
1167 kfree(*option);
1168 *option = match_strdup(args);
1169 return !*option;
1170 }
1171
1172 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1173 {
1174 int rc;
1175 char *string;
1176
1177 string = match_strdup(args);
1178 if (string == NULL)
1179 return -ENOMEM;
1180 rc = kstrtoul(string, 10, option);
1181 kfree(string);
1182
1183 return rc;
1184 }
1185
1186 /*
1187 * Error-check and convert a string of mount options from user space into
1188 * a data structure. The whole mount string is processed; bad options are
1189 * skipped as they are encountered. If there were no errors, return 1;
1190 * otherwise return 0 (zero).
1191 */
1192 static int nfs_parse_mount_options(char *raw,
1193 struct nfs_parsed_mount_data *mnt)
1194 {
1195 char *p, *string, *secdata;
1196 int rc, sloppy = 0, invalid_option = 0;
1197 unsigned short protofamily = AF_UNSPEC;
1198 unsigned short mountfamily = AF_UNSPEC;
1199
1200 if (!raw) {
1201 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1202 return 1;
1203 }
1204 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1205
1206 secdata = alloc_secdata();
1207 if (!secdata)
1208 goto out_nomem;
1209
1210 rc = security_sb_copy_data(raw, secdata);
1211 if (rc)
1212 goto out_security_failure;
1213
1214 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1215 if (rc)
1216 goto out_security_failure;
1217
1218 free_secdata(secdata);
1219
1220 while ((p = strsep(&raw, ",")) != NULL) {
1221 substring_t args[MAX_OPT_ARGS];
1222 unsigned long option;
1223 int token;
1224
1225 if (!*p)
1226 continue;
1227
1228 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1229
1230 token = match_token(p, nfs_mount_option_tokens, args);
1231 switch (token) {
1232
1233 /*
1234 * boolean options: foo/nofoo
1235 */
1236 case Opt_soft:
1237 mnt->flags |= NFS_MOUNT_SOFT;
1238 break;
1239 case Opt_hard:
1240 mnt->flags &= ~NFS_MOUNT_SOFT;
1241 break;
1242 case Opt_posix:
1243 mnt->flags |= NFS_MOUNT_POSIX;
1244 break;
1245 case Opt_noposix:
1246 mnt->flags &= ~NFS_MOUNT_POSIX;
1247 break;
1248 case Opt_cto:
1249 mnt->flags &= ~NFS_MOUNT_NOCTO;
1250 break;
1251 case Opt_nocto:
1252 mnt->flags |= NFS_MOUNT_NOCTO;
1253 break;
1254 case Opt_ac:
1255 mnt->flags &= ~NFS_MOUNT_NOAC;
1256 break;
1257 case Opt_noac:
1258 mnt->flags |= NFS_MOUNT_NOAC;
1259 break;
1260 case Opt_lock:
1261 mnt->flags &= ~NFS_MOUNT_NONLM;
1262 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1263 NFS_MOUNT_LOCAL_FCNTL);
1264 break;
1265 case Opt_nolock:
1266 mnt->flags |= NFS_MOUNT_NONLM;
1267 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1268 NFS_MOUNT_LOCAL_FCNTL);
1269 break;
1270 case Opt_udp:
1271 mnt->flags &= ~NFS_MOUNT_TCP;
1272 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1273 break;
1274 case Opt_tcp:
1275 mnt->flags |= NFS_MOUNT_TCP;
1276 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1277 break;
1278 case Opt_rdma:
1279 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1280 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1281 xprt_load_transport(p);
1282 break;
1283 case Opt_acl:
1284 mnt->flags &= ~NFS_MOUNT_NOACL;
1285 break;
1286 case Opt_noacl:
1287 mnt->flags |= NFS_MOUNT_NOACL;
1288 break;
1289 case Opt_rdirplus:
1290 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1291 break;
1292 case Opt_nordirplus:
1293 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1294 break;
1295 case Opt_sharecache:
1296 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1297 break;
1298 case Opt_nosharecache:
1299 mnt->flags |= NFS_MOUNT_UNSHARED;
1300 break;
1301 case Opt_resvport:
1302 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1303 break;
1304 case Opt_noresvport:
1305 mnt->flags |= NFS_MOUNT_NORESVPORT;
1306 break;
1307 case Opt_fscache:
1308 mnt->options |= NFS_OPTION_FSCACHE;
1309 kfree(mnt->fscache_uniq);
1310 mnt->fscache_uniq = NULL;
1311 break;
1312 case Opt_nofscache:
1313 mnt->options &= ~NFS_OPTION_FSCACHE;
1314 kfree(mnt->fscache_uniq);
1315 mnt->fscache_uniq = NULL;
1316 break;
1317 case Opt_migration:
1318 mnt->options |= NFS_OPTION_MIGRATION;
1319 break;
1320 case Opt_nomigration:
1321 mnt->options &= NFS_OPTION_MIGRATION;
1322 break;
1323
1324 /*
1325 * options that take numeric values
1326 */
1327 case Opt_port:
1328 if (nfs_get_option_ul(args, &option) ||
1329 option > USHRT_MAX)
1330 goto out_invalid_value;
1331 mnt->nfs_server.port = option;
1332 break;
1333 case Opt_rsize:
1334 if (nfs_get_option_ul(args, &option))
1335 goto out_invalid_value;
1336 mnt->rsize = option;
1337 break;
1338 case Opt_wsize:
1339 if (nfs_get_option_ul(args, &option))
1340 goto out_invalid_value;
1341 mnt->wsize = option;
1342 break;
1343 case Opt_bsize:
1344 if (nfs_get_option_ul(args, &option))
1345 goto out_invalid_value;
1346 mnt->bsize = option;
1347 break;
1348 case Opt_timeo:
1349 if (nfs_get_option_ul(args, &option) || option == 0)
1350 goto out_invalid_value;
1351 mnt->timeo = option;
1352 break;
1353 case Opt_retrans:
1354 if (nfs_get_option_ul(args, &option) || option == 0)
1355 goto out_invalid_value;
1356 mnt->retrans = option;
1357 break;
1358 case Opt_acregmin:
1359 if (nfs_get_option_ul(args, &option))
1360 goto out_invalid_value;
1361 mnt->acregmin = option;
1362 break;
1363 case Opt_acregmax:
1364 if (nfs_get_option_ul(args, &option))
1365 goto out_invalid_value;
1366 mnt->acregmax = option;
1367 break;
1368 case Opt_acdirmin:
1369 if (nfs_get_option_ul(args, &option))
1370 goto out_invalid_value;
1371 mnt->acdirmin = option;
1372 break;
1373 case Opt_acdirmax:
1374 if (nfs_get_option_ul(args, &option))
1375 goto out_invalid_value;
1376 mnt->acdirmax = option;
1377 break;
1378 case Opt_actimeo:
1379 if (nfs_get_option_ul(args, &option))
1380 goto out_invalid_value;
1381 mnt->acregmin = mnt->acregmax =
1382 mnt->acdirmin = mnt->acdirmax = option;
1383 break;
1384 case Opt_namelen:
1385 if (nfs_get_option_ul(args, &option))
1386 goto out_invalid_value;
1387 mnt->namlen = option;
1388 break;
1389 case Opt_mountport:
1390 if (nfs_get_option_ul(args, &option) ||
1391 option > USHRT_MAX)
1392 goto out_invalid_value;
1393 mnt->mount_server.port = option;
1394 break;
1395 case Opt_mountvers:
1396 if (nfs_get_option_ul(args, &option) ||
1397 option < NFS_MNT_VERSION ||
1398 option > NFS_MNT3_VERSION)
1399 goto out_invalid_value;
1400 mnt->mount_server.version = option;
1401 break;
1402 case Opt_minorversion:
1403 if (nfs_get_option_ul(args, &option))
1404 goto out_invalid_value;
1405 if (option > NFS4_MAX_MINOR_VERSION)
1406 goto out_invalid_value;
1407 mnt->minorversion = option;
1408 break;
1409
1410 /*
1411 * options that take text values
1412 */
1413 case Opt_nfsvers:
1414 string = match_strdup(args);
1415 if (string == NULL)
1416 goto out_nomem;
1417 rc = nfs_parse_version_string(string, mnt, args);
1418 kfree(string);
1419 if (!rc)
1420 goto out_invalid_value;
1421 break;
1422 case Opt_sec:
1423 string = match_strdup(args);
1424 if (string == NULL)
1425 goto out_nomem;
1426 rc = nfs_parse_security_flavors(string, mnt);
1427 kfree(string);
1428 if (!rc) {
1429 dfprintk(MOUNT, "NFS: unrecognized "
1430 "security flavor\n");
1431 return 0;
1432 }
1433 break;
1434 case Opt_proto:
1435 string = match_strdup(args);
1436 if (string == NULL)
1437 goto out_nomem;
1438 token = match_token(string,
1439 nfs_xprt_protocol_tokens, args);
1440
1441 protofamily = AF_INET;
1442 switch (token) {
1443 case Opt_xprt_udp6:
1444 protofamily = AF_INET6;
1445 case Opt_xprt_udp:
1446 mnt->flags &= ~NFS_MOUNT_TCP;
1447 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1448 break;
1449 case Opt_xprt_tcp6:
1450 protofamily = AF_INET6;
1451 case Opt_xprt_tcp:
1452 mnt->flags |= NFS_MOUNT_TCP;
1453 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1454 break;
1455 case Opt_xprt_rdma:
1456 /* vector side protocols to TCP */
1457 mnt->flags |= NFS_MOUNT_TCP;
1458 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1459 xprt_load_transport(string);
1460 break;
1461 default:
1462 dfprintk(MOUNT, "NFS: unrecognized "
1463 "transport protocol\n");
1464 kfree(string);
1465 return 0;
1466 }
1467 kfree(string);
1468 break;
1469 case Opt_mountproto:
1470 string = match_strdup(args);
1471 if (string == NULL)
1472 goto out_nomem;
1473 token = match_token(string,
1474 nfs_xprt_protocol_tokens, args);
1475 kfree(string);
1476
1477 mountfamily = AF_INET;
1478 switch (token) {
1479 case Opt_xprt_udp6:
1480 mountfamily = AF_INET6;
1481 case Opt_xprt_udp:
1482 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1483 break;
1484 case Opt_xprt_tcp6:
1485 mountfamily = AF_INET6;
1486 case Opt_xprt_tcp:
1487 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1488 break;
1489 case Opt_xprt_rdma: /* not used for side protocols */
1490 default:
1491 dfprintk(MOUNT, "NFS: unrecognized "
1492 "transport protocol\n");
1493 return 0;
1494 }
1495 break;
1496 case Opt_addr:
1497 string = match_strdup(args);
1498 if (string == NULL)
1499 goto out_nomem;
1500 mnt->nfs_server.addrlen =
1501 rpc_pton(mnt->net, string, strlen(string),
1502 (struct sockaddr *)
1503 &mnt->nfs_server.address,
1504 sizeof(mnt->nfs_server.address));
1505 kfree(string);
1506 if (mnt->nfs_server.addrlen == 0)
1507 goto out_invalid_address;
1508 break;
1509 case Opt_clientaddr:
1510 if (nfs_get_option_str(args, &mnt->client_address))
1511 goto out_nomem;
1512 break;
1513 case Opt_mounthost:
1514 if (nfs_get_option_str(args,
1515 &mnt->mount_server.hostname))
1516 goto out_nomem;
1517 break;
1518 case Opt_mountaddr:
1519 string = match_strdup(args);
1520 if (string == NULL)
1521 goto out_nomem;
1522 mnt->mount_server.addrlen =
1523 rpc_pton(mnt->net, string, strlen(string),
1524 (struct sockaddr *)
1525 &mnt->mount_server.address,
1526 sizeof(mnt->mount_server.address));
1527 kfree(string);
1528 if (mnt->mount_server.addrlen == 0)
1529 goto out_invalid_address;
1530 break;
1531 case Opt_lookupcache:
1532 string = match_strdup(args);
1533 if (string == NULL)
1534 goto out_nomem;
1535 token = match_token(string,
1536 nfs_lookupcache_tokens, args);
1537 kfree(string);
1538 switch (token) {
1539 case Opt_lookupcache_all:
1540 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1541 break;
1542 case Opt_lookupcache_positive:
1543 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1544 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1545 break;
1546 case Opt_lookupcache_none:
1547 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1548 break;
1549 default:
1550 dfprintk(MOUNT, "NFS: invalid "
1551 "lookupcache argument\n");
1552 return 0;
1553 };
1554 break;
1555 case Opt_fscache_uniq:
1556 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1557 goto out_nomem;
1558 mnt->options |= NFS_OPTION_FSCACHE;
1559 break;
1560 case Opt_local_lock:
1561 string = match_strdup(args);
1562 if (string == NULL)
1563 goto out_nomem;
1564 token = match_token(string, nfs_local_lock_tokens,
1565 args);
1566 kfree(string);
1567 switch (token) {
1568 case Opt_local_lock_all:
1569 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1570 NFS_MOUNT_LOCAL_FCNTL);
1571 break;
1572 case Opt_local_lock_flock:
1573 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1574 break;
1575 case Opt_local_lock_posix:
1576 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1577 break;
1578 case Opt_local_lock_none:
1579 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1580 NFS_MOUNT_LOCAL_FCNTL);
1581 break;
1582 default:
1583 dfprintk(MOUNT, "NFS: invalid "
1584 "local_lock argument\n");
1585 return 0;
1586 };
1587 break;
1588
1589 /*
1590 * Special options
1591 */
1592 case Opt_sloppy:
1593 sloppy = 1;
1594 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1595 break;
1596 case Opt_userspace:
1597 case Opt_deprecated:
1598 dfprintk(MOUNT, "NFS: ignoring mount option "
1599 "'%s'\n", p);
1600 break;
1601
1602 default:
1603 invalid_option = 1;
1604 dfprintk(MOUNT, "NFS: unrecognized mount option "
1605 "'%s'\n", p);
1606 }
1607 }
1608
1609 if (!sloppy && invalid_option)
1610 return 0;
1611
1612 if (mnt->minorversion && mnt->version != 4)
1613 goto out_minorversion_mismatch;
1614
1615 if (mnt->options & NFS_OPTION_MIGRATION &&
1616 (mnt->version != 4 || mnt->minorversion != 0))
1617 goto out_migration_misuse;
1618
1619 /*
1620 * verify that any proto=/mountproto= options match the address
1621 * families in the addr=/mountaddr= options.
1622 */
1623 if (protofamily != AF_UNSPEC &&
1624 protofamily != mnt->nfs_server.address.ss_family)
1625 goto out_proto_mismatch;
1626
1627 if (mountfamily != AF_UNSPEC) {
1628 if (mnt->mount_server.addrlen) {
1629 if (mountfamily != mnt->mount_server.address.ss_family)
1630 goto out_mountproto_mismatch;
1631 } else {
1632 if (mountfamily != mnt->nfs_server.address.ss_family)
1633 goto out_mountproto_mismatch;
1634 }
1635 }
1636
1637 return 1;
1638
1639 out_mountproto_mismatch:
1640 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1641 "option\n");
1642 return 0;
1643 out_proto_mismatch:
1644 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1645 return 0;
1646 out_invalid_address:
1647 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1648 return 0;
1649 out_invalid_value:
1650 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1651 return 0;
1652 out_minorversion_mismatch:
1653 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1654 "minorversion=%u\n", mnt->version, mnt->minorversion);
1655 return 0;
1656 out_migration_misuse:
1657 printk(KERN_INFO
1658 "NFS: 'migration' not supported for this NFS version\n");
1659 return 0;
1660 out_nomem:
1661 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1662 return 0;
1663 out_security_failure:
1664 free_secdata(secdata);
1665 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1666 return 0;
1667 }
1668
1669 /*
1670 * Ensure that a specified authtype in args->auth_info is supported by
1671 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1672 * -EACCES if not.
1673 */
1674 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1675 rpc_authflavor_t *server_authlist, unsigned int count)
1676 {
1677 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1678 unsigned int i;
1679
1680 /*
1681 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1682 * must be in the list returned by the server.
1683 *
1684 * AUTH_NULL has a special meaning when it's in the server list - it
1685 * means that the server will ignore the rpc creds, so any flavor
1686 * can be used.
1687 */
1688 for (i = 0; i < count; i++) {
1689 flavor = server_authlist[i];
1690
1691 if (nfs_auth_info_match(&args->auth_info, flavor) ||
1692 flavor == RPC_AUTH_NULL)
1693 goto out;
1694 }
1695
1696 dfprintk(MOUNT,
1697 "NFS: specified auth flavors not supported by server\n");
1698 return -EACCES;
1699
1700 out:
1701 args->selected_flavor = flavor;
1702 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1703 return 0;
1704 }
1705
1706 /*
1707 * Use the remote server's MOUNT service to request the NFS file handle
1708 * corresponding to the provided path.
1709 */
1710 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1711 struct nfs_fh *root_fh,
1712 rpc_authflavor_t *server_authlist,
1713 unsigned int *server_authlist_len)
1714 {
1715 struct nfs_mount_request request = {
1716 .sap = (struct sockaddr *)
1717 &args->mount_server.address,
1718 .dirpath = args->nfs_server.export_path,
1719 .protocol = args->mount_server.protocol,
1720 .fh = root_fh,
1721 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1722 .auth_flav_len = server_authlist_len,
1723 .auth_flavs = server_authlist,
1724 .net = args->net,
1725 };
1726 int status;
1727
1728 if (args->mount_server.version == 0) {
1729 switch (args->version) {
1730 default:
1731 args->mount_server.version = NFS_MNT3_VERSION;
1732 break;
1733 case 2:
1734 args->mount_server.version = NFS_MNT_VERSION;
1735 }
1736 }
1737 request.version = args->mount_server.version;
1738
1739 if (args->mount_server.hostname)
1740 request.hostname = args->mount_server.hostname;
1741 else
1742 request.hostname = args->nfs_server.hostname;
1743
1744 /*
1745 * Construct the mount server's address.
1746 */
1747 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1748 memcpy(request.sap, &args->nfs_server.address,
1749 args->nfs_server.addrlen);
1750 args->mount_server.addrlen = args->nfs_server.addrlen;
1751 }
1752 request.salen = args->mount_server.addrlen;
1753 nfs_set_port(request.sap, &args->mount_server.port, 0);
1754
1755 /*
1756 * Now ask the mount server to map our export path
1757 * to a file handle.
1758 */
1759 status = nfs_mount(&request);
1760 if (status != 0) {
1761 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1762 request.hostname, status);
1763 return status;
1764 }
1765
1766 return 0;
1767 }
1768
1769 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1770 struct nfs_subversion *nfs_mod)
1771 {
1772 int status;
1773 unsigned int i;
1774 bool tried_auth_unix = false;
1775 bool auth_null_in_list = false;
1776 struct nfs_server *server = ERR_PTR(-EACCES);
1777 struct nfs_parsed_mount_data *args = mount_info->parsed;
1778 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1779 unsigned int authlist_len = ARRAY_SIZE(authlist);
1780
1781 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1782 &authlist_len);
1783 if (status)
1784 return ERR_PTR(status);
1785
1786 /*
1787 * Was a sec= authflavor specified in the options? First, verify
1788 * whether the server supports it, and then just try to use it if so.
1789 */
1790 if (args->auth_info.flavor_len > 0) {
1791 status = nfs_verify_authflavors(args, authlist, authlist_len);
1792 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1793 args->selected_flavor);
1794 if (status)
1795 return ERR_PTR(status);
1796 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1797 }
1798
1799 /*
1800 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1801 * SHOULD prefer the flavor listed first. However, some servers list
1802 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1803 */
1804 for (i = 0; i < authlist_len; ++i) {
1805 rpc_authflavor_t flavor;
1806 struct rpcsec_gss_info info;
1807
1808 flavor = authlist[i];
1809 switch (flavor) {
1810 case RPC_AUTH_UNIX:
1811 tried_auth_unix = true;
1812 break;
1813 case RPC_AUTH_NULL:
1814 auth_null_in_list = true;
1815 continue;
1816 default:
1817 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1818 continue;
1819 /* Fallthrough */
1820 }
1821 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1822 args->selected_flavor = flavor;
1823 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1824 if (!IS_ERR(server))
1825 return server;
1826 }
1827
1828 /*
1829 * Nothing we tried so far worked. At this point, give up if we've
1830 * already tried AUTH_UNIX or if the server's list doesn't contain
1831 * AUTH_NULL
1832 */
1833 if (tried_auth_unix || !auth_null_in_list)
1834 return server;
1835
1836 /* Last chance! Try AUTH_UNIX */
1837 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1838 args->selected_flavor = RPC_AUTH_UNIX;
1839 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1840 }
1841
1842 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1843 struct nfs_mount_info *mount_info,
1844 struct nfs_subversion *nfs_mod)
1845 {
1846 struct nfs_server *server;
1847
1848 if (mount_info->parsed->need_mount)
1849 server = nfs_try_mount_request(mount_info, nfs_mod);
1850 else
1851 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1852
1853 if (IS_ERR(server))
1854 return ERR_CAST(server);
1855
1856 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1857 }
1858 EXPORT_SYMBOL_GPL(nfs_try_mount);
1859
1860 /*
1861 * Split "dev_name" into "hostname:export_path".
1862 *
1863 * The leftmost colon demarks the split between the server's hostname
1864 * and the export path. If the hostname starts with a left square
1865 * bracket, then it may contain colons.
1866 *
1867 * Note: caller frees hostname and export path, even on error.
1868 */
1869 static int nfs_parse_devname(const char *dev_name,
1870 char **hostname, size_t maxnamlen,
1871 char **export_path, size_t maxpathlen)
1872 {
1873 size_t len;
1874 char *end;
1875
1876 /* Is the host name protected with square brakcets? */
1877 if (*dev_name == '[') {
1878 end = strchr(++dev_name, ']');
1879 if (end == NULL || end[1] != ':')
1880 goto out_bad_devname;
1881
1882 len = end - dev_name;
1883 end++;
1884 } else {
1885 char *comma;
1886
1887 end = strchr(dev_name, ':');
1888 if (end == NULL)
1889 goto out_bad_devname;
1890 len = end - dev_name;
1891
1892 /* kill possible hostname list: not supported */
1893 comma = strchr(dev_name, ',');
1894 if (comma != NULL && comma < end)
1895 *comma = 0;
1896 }
1897
1898 if (len > maxnamlen)
1899 goto out_hostname;
1900
1901 /* N.B. caller will free nfs_server.hostname in all cases */
1902 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1903 if (*hostname == NULL)
1904 goto out_nomem;
1905 len = strlen(++end);
1906 if (len > maxpathlen)
1907 goto out_path;
1908 *export_path = kstrndup(end, len, GFP_KERNEL);
1909 if (!*export_path)
1910 goto out_nomem;
1911
1912 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1913 return 0;
1914
1915 out_bad_devname:
1916 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1917 return -EINVAL;
1918
1919 out_nomem:
1920 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1921 return -ENOMEM;
1922
1923 out_hostname:
1924 dfprintk(MOUNT, "NFS: server hostname too long\n");
1925 return -ENAMETOOLONG;
1926
1927 out_path:
1928 dfprintk(MOUNT, "NFS: export pathname too long\n");
1929 return -ENAMETOOLONG;
1930 }
1931
1932 /*
1933 * Validate the NFS2/NFS3 mount data
1934 * - fills in the mount root filehandle
1935 *
1936 * For option strings, user space handles the following behaviors:
1937 *
1938 * + DNS: mapping server host name to IP address ("addr=" option)
1939 *
1940 * + failure mode: how to behave if a mount request can't be handled
1941 * immediately ("fg/bg" option)
1942 *
1943 * + retry: how often to retry a mount request ("retry=" option)
1944 *
1945 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1946 * mountproto=tcp after mountproto=udp, and so on
1947 */
1948 static int nfs23_validate_mount_data(void *options,
1949 struct nfs_parsed_mount_data *args,
1950 struct nfs_fh *mntfh,
1951 const char *dev_name)
1952 {
1953 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1954 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1955 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1956
1957 if (data == NULL)
1958 goto out_no_data;
1959
1960 args->version = NFS_DEFAULT_VERSION;
1961 switch (data->version) {
1962 case 1:
1963 data->namlen = 0;
1964 case 2:
1965 data->bsize = 0;
1966 case 3:
1967 if (data->flags & NFS_MOUNT_VER3)
1968 goto out_no_v3;
1969 data->root.size = NFS2_FHSIZE;
1970 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1971 /* Turn off security negotiation */
1972 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1973 case 4:
1974 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1975 goto out_no_sec;
1976 case 5:
1977 memset(data->context, 0, sizeof(data->context));
1978 case 6:
1979 if (data->flags & NFS_MOUNT_VER3) {
1980 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1981 goto out_invalid_fh;
1982 mntfh->size = data->root.size;
1983 args->version = 3;
1984 } else {
1985 mntfh->size = NFS2_FHSIZE;
1986 args->version = 2;
1987 }
1988
1989
1990 memcpy(mntfh->data, data->root.data, mntfh->size);
1991 if (mntfh->size < sizeof(mntfh->data))
1992 memset(mntfh->data + mntfh->size, 0,
1993 sizeof(mntfh->data) - mntfh->size);
1994
1995 /*
1996 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1997 * can deal with.
1998 */
1999 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2000 args->flags |= extra_flags;
2001 args->rsize = data->rsize;
2002 args->wsize = data->wsize;
2003 args->timeo = data->timeo;
2004 args->retrans = data->retrans;
2005 args->acregmin = data->acregmin;
2006 args->acregmax = data->acregmax;
2007 args->acdirmin = data->acdirmin;
2008 args->acdirmax = data->acdirmax;
2009 args->need_mount = false;
2010
2011 memcpy(sap, &data->addr, sizeof(data->addr));
2012 args->nfs_server.addrlen = sizeof(data->addr);
2013 args->nfs_server.port = ntohs(data->addr.sin_port);
2014 if (!nfs_verify_server_address(sap))
2015 goto out_no_address;
2016
2017 if (!(data->flags & NFS_MOUNT_TCP))
2018 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2019 /* N.B. caller will free nfs_server.hostname in all cases */
2020 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2021 args->namlen = data->namlen;
2022 args->bsize = data->bsize;
2023
2024 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2025 args->selected_flavor = data->pseudoflavor;
2026 else
2027 args->selected_flavor = RPC_AUTH_UNIX;
2028 if (!args->nfs_server.hostname)
2029 goto out_nomem;
2030
2031 if (!(data->flags & NFS_MOUNT_NONLM))
2032 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2033 NFS_MOUNT_LOCAL_FCNTL);
2034 else
2035 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2036 NFS_MOUNT_LOCAL_FCNTL);
2037 /*
2038 * The legacy version 6 binary mount data from userspace has a
2039 * field used only to transport selinux information into the
2040 * the kernel. To continue to support that functionality we
2041 * have a touch of selinux knowledge here in the NFS code. The
2042 * userspace code converted context=blah to just blah so we are
2043 * converting back to the full string selinux understands.
2044 */
2045 if (data->context[0]){
2046 #ifdef CONFIG_SECURITY_SELINUX
2047 int rc;
2048 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2049 if (!opts_str)
2050 return -ENOMEM;
2051 strcpy(opts_str, "context=");
2052 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2053 strcat(opts_str, &data->context[0]);
2054 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2055 kfree(opts_str);
2056 if (rc)
2057 return rc;
2058 #else
2059 return -EINVAL;
2060 #endif
2061 }
2062
2063 break;
2064 default:
2065 return NFS_TEXT_DATA;
2066 }
2067
2068 return 0;
2069
2070 out_no_data:
2071 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2072 return -EINVAL;
2073
2074 out_no_v3:
2075 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2076 data->version);
2077 return -EINVAL;
2078
2079 out_no_sec:
2080 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2081 return -EINVAL;
2082
2083 out_nomem:
2084 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2085 return -ENOMEM;
2086
2087 out_no_address:
2088 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2089 return -EINVAL;
2090
2091 out_invalid_fh:
2092 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2093 return -EINVAL;
2094 }
2095
2096 #if IS_ENABLED(CONFIG_NFS_V4)
2097 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2098 void *options,
2099 struct nfs_parsed_mount_data *args,
2100 struct nfs_fh *mntfh,
2101 const char *dev_name)
2102 {
2103 if (fs_type == &nfs_fs_type)
2104 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2105 return nfs4_validate_mount_data(options, args, dev_name);
2106 }
2107 #else
2108 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2109 void *options,
2110 struct nfs_parsed_mount_data *args,
2111 struct nfs_fh *mntfh,
2112 const char *dev_name)
2113 {
2114 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2115 }
2116 #endif
2117
2118 static int nfs_validate_text_mount_data(void *options,
2119 struct nfs_parsed_mount_data *args,
2120 const char *dev_name)
2121 {
2122 int port = 0;
2123 int max_namelen = PAGE_SIZE;
2124 int max_pathlen = NFS_MAXPATHLEN;
2125 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2126
2127 if (nfs_parse_mount_options((char *)options, args) == 0)
2128 return -EINVAL;
2129
2130 if (!nfs_verify_server_address(sap))
2131 goto out_no_address;
2132
2133 if (args->version == 4) {
2134 #if IS_ENABLED(CONFIG_NFS_V4)
2135 port = NFS_PORT;
2136 max_namelen = NFS4_MAXNAMLEN;
2137 max_pathlen = NFS4_MAXPATHLEN;
2138 nfs_validate_transport_protocol(args);
2139 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2140 goto out_invalid_transport_udp;
2141 nfs4_validate_mount_flags(args);
2142 #else
2143 goto out_v4_not_compiled;
2144 #endif /* CONFIG_NFS_V4 */
2145 } else
2146 nfs_set_mount_transport_protocol(args);
2147
2148 nfs_set_port(sap, &args->nfs_server.port, port);
2149
2150 return nfs_parse_devname(dev_name,
2151 &args->nfs_server.hostname,
2152 max_namelen,
2153 &args->nfs_server.export_path,
2154 max_pathlen);
2155
2156 #if !IS_ENABLED(CONFIG_NFS_V4)
2157 out_v4_not_compiled:
2158 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2159 return -EPROTONOSUPPORT;
2160 #else
2161 out_invalid_transport_udp:
2162 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2163 return -EINVAL;
2164 #endif /* !CONFIG_NFS_V4 */
2165
2166 out_no_address:
2167 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2168 return -EINVAL;
2169 }
2170
2171 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2172 | NFS_MOUNT_SECURE \
2173 | NFS_MOUNT_TCP \
2174 | NFS_MOUNT_VER3 \
2175 | NFS_MOUNT_KERBEROS \
2176 | NFS_MOUNT_NONLM \
2177 | NFS_MOUNT_BROKEN_SUID \
2178 | NFS_MOUNT_STRICTLOCK \
2179 | NFS_MOUNT_LEGACY_INTERFACE)
2180
2181 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2182 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2183
2184 static int
2185 nfs_compare_remount_data(struct nfs_server *nfss,
2186 struct nfs_parsed_mount_data *data)
2187 {
2188 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2189 data->rsize != nfss->rsize ||
2190 data->wsize != nfss->wsize ||
2191 data->version != nfss->nfs_client->rpc_ops->version ||
2192 data->minorversion != nfss->nfs_client->cl_minorversion ||
2193 data->retrans != nfss->client->cl_timeout->to_retries ||
2194 data->selected_flavor != nfss->client->cl_auth->au_flavor ||
2195 data->acregmin != nfss->acregmin / HZ ||
2196 data->acregmax != nfss->acregmax / HZ ||
2197 data->acdirmin != nfss->acdirmin / HZ ||
2198 data->acdirmax != nfss->acdirmax / HZ ||
2199 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2200 data->nfs_server.port != nfss->port ||
2201 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2202 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2203 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2204 return -EINVAL;
2205
2206 return 0;
2207 }
2208
2209 int
2210 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2211 {
2212 int error;
2213 struct nfs_server *nfss = sb->s_fs_info;
2214 struct nfs_parsed_mount_data *data;
2215 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2216 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2217 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2218
2219 sync_filesystem(sb);
2220
2221 /*
2222 * Userspace mount programs that send binary options generally send
2223 * them populated with default values. We have no way to know which
2224 * ones were explicitly specified. Fall back to legacy behavior and
2225 * just return success.
2226 */
2227 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2228 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2229 options->version <= 6))))
2230 return 0;
2231
2232 data = kzalloc(sizeof(*data), GFP_KERNEL);
2233 if (data == NULL)
2234 return -ENOMEM;
2235
2236 /* fill out struct with values from existing mount */
2237 data->flags = nfss->flags;
2238 data->rsize = nfss->rsize;
2239 data->wsize = nfss->wsize;
2240 data->retrans = nfss->client->cl_timeout->to_retries;
2241 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2242 data->auth_info = nfss->auth_info;
2243 data->acregmin = nfss->acregmin / HZ;
2244 data->acregmax = nfss->acregmax / HZ;
2245 data->acdirmin = nfss->acdirmin / HZ;
2246 data->acdirmax = nfss->acdirmax / HZ;
2247 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2248 data->nfs_server.port = nfss->port;
2249 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2250 data->version = nfsvers;
2251 data->minorversion = nfss->nfs_client->cl_minorversion;
2252 data->net = current->nsproxy->net_ns;
2253 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2254 data->nfs_server.addrlen);
2255
2256 /* overwrite those values with any that were specified */
2257 error = -EINVAL;
2258 if (!nfs_parse_mount_options((char *)options, data))
2259 goto out;
2260
2261 /*
2262 * noac is a special case. It implies -o sync, but that's not
2263 * necessarily reflected in the mtab options. do_remount_sb
2264 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2265 * remount options, so we have to explicitly reset it.
2266 */
2267 if (data->flags & NFS_MOUNT_NOAC)
2268 *flags |= MS_SYNCHRONOUS;
2269
2270 /* compare new mount options with old ones */
2271 error = nfs_compare_remount_data(nfss, data);
2272 out:
2273 kfree(data);
2274 return error;
2275 }
2276 EXPORT_SYMBOL_GPL(nfs_remount);
2277
2278 /*
2279 * Initialise the common bits of the superblock
2280 */
2281 inline void nfs_initialise_sb(struct super_block *sb)
2282 {
2283 struct nfs_server *server = NFS_SB(sb);
2284
2285 sb->s_magic = NFS_SUPER_MAGIC;
2286
2287 /* We probably want something more informative here */
2288 snprintf(sb->s_id, sizeof(sb->s_id),
2289 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2290
2291 if (sb->s_blocksize == 0)
2292 sb->s_blocksize = nfs_block_bits(server->wsize,
2293 &sb->s_blocksize_bits);
2294
2295 sb->s_bdi = &server->backing_dev_info;
2296
2297 nfs_super_set_maxbytes(sb, server->maxfilesize);
2298 }
2299
2300 /*
2301 * Finish setting up an NFS2/3 superblock
2302 */
2303 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2304 {
2305 struct nfs_parsed_mount_data *data = mount_info->parsed;
2306 struct nfs_server *server = NFS_SB(sb);
2307
2308 sb->s_blocksize_bits = 0;
2309 sb->s_blocksize = 0;
2310 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2311 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2312 if (data && data->bsize)
2313 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2314
2315 if (server->nfs_client->rpc_ops->version != 2) {
2316 /* The VFS shouldn't apply the umask to mode bits. We will do
2317 * so ourselves when necessary.
2318 */
2319 sb->s_flags |= MS_POSIXACL;
2320 sb->s_time_gran = 1;
2321 }
2322
2323 nfs_initialise_sb(sb);
2324 }
2325 EXPORT_SYMBOL_GPL(nfs_fill_super);
2326
2327 /*
2328 * Finish setting up a cloned NFS2/3/4 superblock
2329 */
2330 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2331 {
2332 const struct super_block *old_sb = mount_info->cloned->sb;
2333 struct nfs_server *server = NFS_SB(sb);
2334
2335 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2336 sb->s_blocksize = old_sb->s_blocksize;
2337 sb->s_maxbytes = old_sb->s_maxbytes;
2338 sb->s_xattr = old_sb->s_xattr;
2339 sb->s_op = old_sb->s_op;
2340 sb->s_time_gran = 1;
2341
2342 if (server->nfs_client->rpc_ops->version != 2) {
2343 /* The VFS shouldn't apply the umask to mode bits. We will do
2344 * so ourselves when necessary.
2345 */
2346 sb->s_flags |= MS_POSIXACL;
2347 }
2348
2349 nfs_initialise_sb(sb);
2350 }
2351
2352 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2353 {
2354 const struct nfs_server *a = s->s_fs_info;
2355 const struct rpc_clnt *clnt_a = a->client;
2356 const struct rpc_clnt *clnt_b = b->client;
2357
2358 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2359 goto Ebusy;
2360 if (a->nfs_client != b->nfs_client)
2361 goto Ebusy;
2362 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2363 goto Ebusy;
2364 if (a->wsize != b->wsize)
2365 goto Ebusy;
2366 if (a->rsize != b->rsize)
2367 goto Ebusy;
2368 if (a->acregmin != b->acregmin)
2369 goto Ebusy;
2370 if (a->acregmax != b->acregmax)
2371 goto Ebusy;
2372 if (a->acdirmin != b->acdirmin)
2373 goto Ebusy;
2374 if (a->acdirmax != b->acdirmax)
2375 goto Ebusy;
2376 if (b->auth_info.flavor_len > 0 &&
2377 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2378 goto Ebusy;
2379 return 1;
2380 Ebusy:
2381 return 0;
2382 }
2383
2384 struct nfs_sb_mountdata {
2385 struct nfs_server *server;
2386 int mntflags;
2387 };
2388
2389 static int nfs_set_super(struct super_block *s, void *data)
2390 {
2391 struct nfs_sb_mountdata *sb_mntdata = data;
2392 struct nfs_server *server = sb_mntdata->server;
2393 int ret;
2394
2395 s->s_flags = sb_mntdata->mntflags;
2396 s->s_fs_info = server;
2397 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2398 ret = set_anon_super(s, server);
2399 if (ret == 0)
2400 server->s_dev = s->s_dev;
2401 return ret;
2402 }
2403
2404 static int nfs_compare_super_address(struct nfs_server *server1,
2405 struct nfs_server *server2)
2406 {
2407 struct sockaddr *sap1, *sap2;
2408
2409 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2410 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2411
2412 if (sap1->sa_family != sap2->sa_family)
2413 return 0;
2414
2415 switch (sap1->sa_family) {
2416 case AF_INET: {
2417 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2418 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2419 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2420 return 0;
2421 if (sin1->sin_port != sin2->sin_port)
2422 return 0;
2423 break;
2424 }
2425 case AF_INET6: {
2426 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2427 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2428 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2429 return 0;
2430 if (sin1->sin6_port != sin2->sin6_port)
2431 return 0;
2432 break;
2433 }
2434 default:
2435 return 0;
2436 }
2437
2438 return 1;
2439 }
2440
2441 static int nfs_compare_super(struct super_block *sb, void *data)
2442 {
2443 struct nfs_sb_mountdata *sb_mntdata = data;
2444 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2445 int mntflags = sb_mntdata->mntflags;
2446
2447 if (!nfs_compare_super_address(old, server))
2448 return 0;
2449 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2450 if (old->flags & NFS_MOUNT_UNSHARED)
2451 return 0;
2452 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2453 return 0;
2454 return nfs_compare_mount_options(sb, server, mntflags);
2455 }
2456
2457 #ifdef CONFIG_NFS_FSCACHE
2458 static void nfs_get_cache_cookie(struct super_block *sb,
2459 struct nfs_parsed_mount_data *parsed,
2460 struct nfs_clone_mount *cloned)
2461 {
2462 struct nfs_server *nfss = NFS_SB(sb);
2463 char *uniq = NULL;
2464 int ulen = 0;
2465
2466 nfss->fscache_key = NULL;
2467 nfss->fscache = NULL;
2468
2469 if (parsed) {
2470 if (!(parsed->options & NFS_OPTION_FSCACHE))
2471 return;
2472 if (parsed->fscache_uniq) {
2473 uniq = parsed->fscache_uniq;
2474 ulen = strlen(parsed->fscache_uniq);
2475 }
2476 } else if (cloned) {
2477 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2478 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2479 return;
2480 if (mnt_s->fscache_key) {
2481 uniq = mnt_s->fscache_key->key.uniquifier;
2482 ulen = mnt_s->fscache_key->key.uniq_len;
2483 };
2484 } else
2485 return;
2486
2487 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2488 }
2489 #else
2490 static void nfs_get_cache_cookie(struct super_block *sb,
2491 struct nfs_parsed_mount_data *parsed,
2492 struct nfs_clone_mount *cloned)
2493 {
2494 }
2495 #endif
2496
2497 static int nfs_bdi_register(struct nfs_server *server)
2498 {
2499 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2500 }
2501
2502 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2503 struct nfs_mount_info *mount_info)
2504 {
2505 int error;
2506 unsigned long kflags = 0, kflags_out = 0;
2507 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2508 kflags |= SECURITY_LSM_NATIVE_LABELS;
2509
2510 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2511 kflags, &kflags_out);
2512 if (error)
2513 goto err;
2514
2515 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2516 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2517 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2518 err:
2519 return error;
2520 }
2521 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2522
2523 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2524 struct nfs_mount_info *mount_info)
2525 {
2526 /* clone any lsm security options from the parent to the new sb */
2527 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2528 return -ESTALE;
2529 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2530 }
2531 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2532
2533 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2534 int flags, const char *dev_name,
2535 struct nfs_mount_info *mount_info,
2536 struct nfs_subversion *nfs_mod)
2537 {
2538 struct super_block *s;
2539 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2540 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2541 struct nfs_sb_mountdata sb_mntdata = {
2542 .mntflags = flags,
2543 .server = server,
2544 };
2545 int error;
2546
2547 if (server->flags & NFS_MOUNT_UNSHARED)
2548 compare_super = NULL;
2549
2550 /* -o noac implies -o sync */
2551 if (server->flags & NFS_MOUNT_NOAC)
2552 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2553
2554 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2555 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2556 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2557
2558 /* Get a superblock - note that we may end up sharing one that already exists */
2559 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2560 if (IS_ERR(s)) {
2561 mntroot = ERR_CAST(s);
2562 goto out_err_nosb;
2563 }
2564
2565 if (s->s_fs_info != server) {
2566 nfs_free_server(server);
2567 server = NULL;
2568 } else {
2569 error = nfs_bdi_register(server);
2570 if (error) {
2571 mntroot = ERR_PTR(error);
2572 goto error_splat_bdi;
2573 }
2574 server->super = s;
2575 }
2576
2577 if (!s->s_root) {
2578 /* initial superblock/root creation */
2579 mount_info->fill_super(s, mount_info);
2580 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2581 }
2582
2583 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2584 if (IS_ERR(mntroot))
2585 goto error_splat_super;
2586
2587 error = mount_info->set_security(s, mntroot, mount_info);
2588 if (error)
2589 goto error_splat_root;
2590
2591 s->s_flags |= MS_ACTIVE;
2592
2593 out:
2594 return mntroot;
2595
2596 out_err_nosb:
2597 nfs_free_server(server);
2598 goto out;
2599
2600 error_splat_root:
2601 dput(mntroot);
2602 mntroot = ERR_PTR(error);
2603 error_splat_super:
2604 if (server && !s->s_root)
2605 bdi_unregister(&server->backing_dev_info);
2606 error_splat_bdi:
2607 deactivate_locked_super(s);
2608 goto out;
2609 }
2610 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2611
2612 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2613 int flags, const char *dev_name, void *raw_data)
2614 {
2615 struct nfs_mount_info mount_info = {
2616 .fill_super = nfs_fill_super,
2617 .set_security = nfs_set_sb_security,
2618 };
2619 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2620 struct nfs_subversion *nfs_mod;
2621 int error;
2622
2623 mount_info.parsed = nfs_alloc_parsed_mount_data();
2624 mount_info.mntfh = nfs_alloc_fhandle();
2625 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2626 goto out;
2627
2628 /* Validate the mount data */
2629 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2630 if (error == NFS_TEXT_DATA)
2631 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2632 if (error < 0) {
2633 mntroot = ERR_PTR(error);
2634 goto out;
2635 }
2636
2637 nfs_mod = get_nfs_version(mount_info.parsed->version);
2638 if (IS_ERR(nfs_mod)) {
2639 mntroot = ERR_CAST(nfs_mod);
2640 goto out;
2641 }
2642
2643 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2644
2645 put_nfs_version(nfs_mod);
2646 out:
2647 nfs_free_parsed_mount_data(mount_info.parsed);
2648 nfs_free_fhandle(mount_info.mntfh);
2649 return mntroot;
2650 }
2651 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2652
2653 /*
2654 * Ensure that we unregister the bdi before kill_anon_super
2655 * releases the device name
2656 */
2657 void nfs_put_super(struct super_block *s)
2658 {
2659 struct nfs_server *server = NFS_SB(s);
2660
2661 bdi_unregister(&server->backing_dev_info);
2662 }
2663 EXPORT_SYMBOL_GPL(nfs_put_super);
2664
2665 /*
2666 * Destroy an NFS2/3 superblock
2667 */
2668 void nfs_kill_super(struct super_block *s)
2669 {
2670 struct nfs_server *server = NFS_SB(s);
2671
2672 kill_anon_super(s);
2673 nfs_fscache_release_super_cookie(s);
2674 nfs_free_server(server);
2675 }
2676 EXPORT_SYMBOL_GPL(nfs_kill_super);
2677
2678 /*
2679 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2680 */
2681 static struct dentry *
2682 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2683 const char *dev_name, void *raw_data)
2684 {
2685 struct nfs_clone_mount *data = raw_data;
2686 struct nfs_mount_info mount_info = {
2687 .fill_super = nfs_clone_super,
2688 .set_security = nfs_clone_sb_security,
2689 .cloned = data,
2690 };
2691 struct nfs_server *server;
2692 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2693 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2694
2695 dprintk("--> nfs_xdev_mount()\n");
2696
2697 mount_info.mntfh = mount_info.cloned->fh;
2698
2699 /* create a new volume representation */
2700 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2701
2702 if (IS_ERR(server))
2703 mntroot = ERR_CAST(server);
2704 else
2705 mntroot = nfs_fs_mount_common(server, flags,
2706 dev_name, &mount_info, nfs_mod);
2707
2708 dprintk("<-- nfs_xdev_mount() = %ld\n",
2709 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2710 return mntroot;
2711 }
2712
2713 #if IS_ENABLED(CONFIG_NFS_V4)
2714
2715 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2716 {
2717 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2718 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2719 }
2720
2721 /*
2722 * Validate NFSv4 mount options
2723 */
2724 static int nfs4_validate_mount_data(void *options,
2725 struct nfs_parsed_mount_data *args,
2726 const char *dev_name)
2727 {
2728 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2729 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2730 char *c;
2731
2732 if (data == NULL)
2733 goto out_no_data;
2734
2735 args->version = 4;
2736
2737 switch (data->version) {
2738 case 1:
2739 if (data->host_addrlen > sizeof(args->nfs_server.address))
2740 goto out_no_address;
2741 if (data->host_addrlen == 0)
2742 goto out_no_address;
2743 args->nfs_server.addrlen = data->host_addrlen;
2744 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2745 return -EFAULT;
2746 if (!nfs_verify_server_address(sap))
2747 goto out_no_address;
2748 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2749
2750 if (data->auth_flavourlen) {
2751 rpc_authflavor_t pseudoflavor;
2752 if (data->auth_flavourlen > 1)
2753 goto out_inval_auth;
2754 if (copy_from_user(&pseudoflavor,
2755 data->auth_flavours,
2756 sizeof(pseudoflavor)))
2757 return -EFAULT;
2758 args->selected_flavor = pseudoflavor;
2759 } else
2760 args->selected_flavor = RPC_AUTH_UNIX;
2761
2762 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2763 if (IS_ERR(c))
2764 return PTR_ERR(c);
2765 args->nfs_server.hostname = c;
2766
2767 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2768 if (IS_ERR(c))
2769 return PTR_ERR(c);
2770 args->nfs_server.export_path = c;
2771 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2772
2773 c = strndup_user(data->client_addr.data, 16);
2774 if (IS_ERR(c))
2775 return PTR_ERR(c);
2776 args->client_address = c;
2777
2778 /*
2779 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2780 * can deal with.
2781 */
2782
2783 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2784 args->rsize = data->rsize;
2785 args->wsize = data->wsize;
2786 args->timeo = data->timeo;
2787 args->retrans = data->retrans;
2788 args->acregmin = data->acregmin;
2789 args->acregmax = data->acregmax;
2790 args->acdirmin = data->acdirmin;
2791 args->acdirmax = data->acdirmax;
2792 args->nfs_server.protocol = data->proto;
2793 nfs_validate_transport_protocol(args);
2794 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2795 goto out_invalid_transport_udp;
2796
2797 break;
2798 default:
2799 return NFS_TEXT_DATA;
2800 }
2801
2802 return 0;
2803
2804 out_no_data:
2805 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2806 return -EINVAL;
2807
2808 out_inval_auth:
2809 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2810 data->auth_flavourlen);
2811 return -EINVAL;
2812
2813 out_no_address:
2814 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2815 return -EINVAL;
2816
2817 out_invalid_transport_udp:
2818 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2819 return -EINVAL;
2820 }
2821
2822 /*
2823 * NFS v4 module parameters need to stay in the
2824 * NFS client for backwards compatibility
2825 */
2826 unsigned int nfs_callback_set_tcpport;
2827 unsigned short nfs_callback_tcpport;
2828 /* Default cache timeout is 10 minutes */
2829 unsigned int nfs_idmap_cache_timeout = 600;
2830 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2831 bool nfs4_disable_idmapping = true;
2832 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2833 unsigned short send_implementation_id = 1;
2834 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2835 bool recover_lost_locks = false;
2836
2837 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2838 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2839 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2840 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2841 EXPORT_SYMBOL_GPL(max_session_slots);
2842 EXPORT_SYMBOL_GPL(send_implementation_id);
2843 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2844 EXPORT_SYMBOL_GPL(recover_lost_locks);
2845
2846 #define NFS_CALLBACK_MAXPORTNR (65535U)
2847
2848 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2849 {
2850 unsigned long num;
2851 int ret;
2852
2853 if (!val)
2854 return -EINVAL;
2855 ret = kstrtoul(val, 0, &num);
2856 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2857 return -EINVAL;
2858 *((unsigned int *)kp->arg) = num;
2859 return 0;
2860 }
2861 static struct kernel_param_ops param_ops_portnr = {
2862 .set = param_set_portnr,
2863 .get = param_get_uint,
2864 };
2865 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2866
2867 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2868 module_param(nfs_idmap_cache_timeout, int, 0644);
2869 module_param(nfs4_disable_idmapping, bool, 0644);
2870 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2871 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2872 MODULE_PARM_DESC(nfs4_disable_idmapping,
2873 "Turn off NFSv4 idmapping when using 'sec=sys'");
2874 module_param(max_session_slots, ushort, 0644);
2875 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2876 "requests the client will negotiate");
2877 module_param(send_implementation_id, ushort, 0644);
2878 MODULE_PARM_DESC(send_implementation_id,
2879 "Send implementation ID with NFSv4.1 exchange_id");
2880 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2881
2882 module_param(recover_lost_locks, bool, 0644);
2883 MODULE_PARM_DESC(recover_lost_locks,
2884 "If the server reports that a lock might be lost, "
2885 "try to recover it risking data corruption.");
2886
2887
2888 #endif /* CONFIG_NFS_V4 */
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