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Merge branch 'for-3.20' of git://linux-nfs.org/~bfields/linux
[mirror_ubuntu-zesty-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 bool nfs_sb_active(struct super_block *sb)
409 {
410 struct nfs_server *server = NFS_SB(sb);
411
412 if (!atomic_inc_not_zero(&sb->s_active))
413 return false;
414 if (atomic_inc_return(&server->active) != 1)
415 atomic_dec(&sb->s_active);
416 return true;
417 }
418 EXPORT_SYMBOL_GPL(nfs_sb_active);
419
420 void nfs_sb_deactive(struct super_block *sb)
421 {
422 struct nfs_server *server = NFS_SB(sb);
423
424 if (atomic_dec_and_test(&server->active))
425 deactivate_super(sb);
426 }
427 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
428
429 /*
430 * Deliver file system statistics to userspace
431 */
432 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
433 {
434 struct nfs_server *server = NFS_SB(dentry->d_sb);
435 unsigned char blockbits;
436 unsigned long blockres;
437 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
438 struct nfs_fsstat res;
439 int error = -ENOMEM;
440
441 res.fattr = nfs_alloc_fattr();
442 if (res.fattr == NULL)
443 goto out_err;
444
445 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
446 if (unlikely(error == -ESTALE)) {
447 struct dentry *pd_dentry;
448
449 pd_dentry = dget_parent(dentry);
450 if (pd_dentry != NULL) {
451 nfs_zap_caches(pd_dentry->d_inode);
452 dput(pd_dentry);
453 }
454 }
455 nfs_free_fattr(res.fattr);
456 if (error < 0)
457 goto out_err;
458
459 buf->f_type = NFS_SUPER_MAGIC;
460
461 /*
462 * Current versions of glibc do not correctly handle the
463 * case where f_frsize != f_bsize. Eventually we want to
464 * report the value of wtmult in this field.
465 */
466 buf->f_frsize = dentry->d_sb->s_blocksize;
467
468 /*
469 * On most *nix systems, f_blocks, f_bfree, and f_bavail
470 * are reported in units of f_frsize. Linux hasn't had
471 * an f_frsize field in its statfs struct until recently,
472 * thus historically Linux's sys_statfs reports these
473 * fields in units of f_bsize.
474 */
475 buf->f_bsize = dentry->d_sb->s_blocksize;
476 blockbits = dentry->d_sb->s_blocksize_bits;
477 blockres = (1 << blockbits) - 1;
478 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
479 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
480 buf->f_bavail = (res.abytes + blockres) >> blockbits;
481
482 buf->f_files = res.tfiles;
483 buf->f_ffree = res.afiles;
484
485 buf->f_namelen = server->namelen;
486
487 return 0;
488
489 out_err:
490 dprintk("%s: statfs error = %d\n", __func__, -error);
491 return error;
492 }
493 EXPORT_SYMBOL_GPL(nfs_statfs);
494
495 /*
496 * Map the security flavour number to a name
497 */
498 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
499 {
500 static const struct {
501 rpc_authflavor_t flavour;
502 const char *str;
503 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
504 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
505 { RPC_AUTH_NULL, "null" },
506 { RPC_AUTH_UNIX, "sys" },
507 { RPC_AUTH_GSS_KRB5, "krb5" },
508 { RPC_AUTH_GSS_KRB5I, "krb5i" },
509 { RPC_AUTH_GSS_KRB5P, "krb5p" },
510 { RPC_AUTH_GSS_LKEY, "lkey" },
511 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
512 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
513 { RPC_AUTH_GSS_SPKM, "spkm" },
514 { RPC_AUTH_GSS_SPKMI, "spkmi" },
515 { RPC_AUTH_GSS_SPKMP, "spkmp" },
516 { UINT_MAX, "unknown" }
517 };
518 int i;
519
520 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
521 if (sec_flavours[i].flavour == flavour)
522 break;
523 }
524 return sec_flavours[i].str;
525 }
526
527 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
528 int showdefaults)
529 {
530 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
531
532 seq_printf(m, ",mountproto=");
533 switch (sap->sa_family) {
534 case AF_INET:
535 switch (nfss->mountd_protocol) {
536 case IPPROTO_UDP:
537 seq_printf(m, RPCBIND_NETID_UDP);
538 break;
539 case IPPROTO_TCP:
540 seq_printf(m, RPCBIND_NETID_TCP);
541 break;
542 default:
543 if (showdefaults)
544 seq_printf(m, "auto");
545 }
546 break;
547 case AF_INET6:
548 switch (nfss->mountd_protocol) {
549 case IPPROTO_UDP:
550 seq_printf(m, RPCBIND_NETID_UDP6);
551 break;
552 case IPPROTO_TCP:
553 seq_printf(m, RPCBIND_NETID_TCP6);
554 break;
555 default:
556 if (showdefaults)
557 seq_printf(m, "auto");
558 }
559 break;
560 default:
561 if (showdefaults)
562 seq_printf(m, "auto");
563 }
564 }
565
566 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
567 int showdefaults)
568 {
569 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
570
571 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
572 return;
573
574 switch (sap->sa_family) {
575 case AF_INET: {
576 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
577 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
578 break;
579 }
580 case AF_INET6: {
581 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
582 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
583 break;
584 }
585 default:
586 if (showdefaults)
587 seq_printf(m, ",mountaddr=unspecified");
588 }
589
590 if (nfss->mountd_version || showdefaults)
591 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
592 if ((nfss->mountd_port &&
593 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
594 showdefaults)
595 seq_printf(m, ",mountport=%u", nfss->mountd_port);
596
597 nfs_show_mountd_netid(m, nfss, showdefaults);
598 }
599
600 #if IS_ENABLED(CONFIG_NFS_V4)
601 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
602 int showdefaults)
603 {
604 struct nfs_client *clp = nfss->nfs_client;
605
606 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
607 }
608 #else
609 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
610 int showdefaults)
611 {
612 }
613 #endif
614
615 static void nfs_show_nfs_version(struct seq_file *m,
616 unsigned int version,
617 unsigned int minorversion)
618 {
619 seq_printf(m, ",vers=%u", version);
620 if (version == 4)
621 seq_printf(m, ".%u", minorversion);
622 }
623
624 /*
625 * Describe the mount options in force on this server representation
626 */
627 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
628 int showdefaults)
629 {
630 static const struct proc_nfs_info {
631 int flag;
632 const char *str;
633 const char *nostr;
634 } nfs_info[] = {
635 { NFS_MOUNT_SOFT, ",soft", ",hard" },
636 { NFS_MOUNT_POSIX, ",posix", "" },
637 { NFS_MOUNT_NOCTO, ",nocto", "" },
638 { NFS_MOUNT_NOAC, ",noac", "" },
639 { NFS_MOUNT_NONLM, ",nolock", "" },
640 { NFS_MOUNT_NOACL, ",noacl", "" },
641 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
642 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
643 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
644 { 0, NULL, NULL }
645 };
646 const struct proc_nfs_info *nfs_infop;
647 struct nfs_client *clp = nfss->nfs_client;
648 u32 version = clp->rpc_ops->version;
649 int local_flock, local_fcntl;
650
651 nfs_show_nfs_version(m, version, clp->cl_minorversion);
652 seq_printf(m, ",rsize=%u", nfss->rsize);
653 seq_printf(m, ",wsize=%u", nfss->wsize);
654 if (nfss->bsize != 0)
655 seq_printf(m, ",bsize=%u", nfss->bsize);
656 seq_printf(m, ",namlen=%u", nfss->namelen);
657 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
658 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
659 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
660 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
661 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
662 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
663 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
664 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
665 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
666 if (nfss->flags & nfs_infop->flag)
667 seq_puts(m, nfs_infop->str);
668 else
669 seq_puts(m, nfs_infop->nostr);
670 }
671 rcu_read_lock();
672 seq_printf(m, ",proto=%s",
673 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
674 rcu_read_unlock();
675 if (version == 4) {
676 if (nfss->port != NFS_PORT)
677 seq_printf(m, ",port=%u", nfss->port);
678 } else
679 if (nfss->port)
680 seq_printf(m, ",port=%u", nfss->port);
681
682 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
683 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
684 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
685
686 if (version != 4)
687 nfs_show_mountd_options(m, nfss, showdefaults);
688 else
689 nfs_show_nfsv4_options(m, nfss, showdefaults);
690
691 if (nfss->options & NFS_OPTION_FSCACHE)
692 seq_printf(m, ",fsc");
693
694 if (nfss->options & NFS_OPTION_MIGRATION)
695 seq_printf(m, ",migration");
696
697 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
698 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
699 seq_printf(m, ",lookupcache=none");
700 else
701 seq_printf(m, ",lookupcache=pos");
702 }
703
704 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
705 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
706
707 if (!local_flock && !local_fcntl)
708 seq_printf(m, ",local_lock=none");
709 else if (local_flock && local_fcntl)
710 seq_printf(m, ",local_lock=all");
711 else if (local_flock)
712 seq_printf(m, ",local_lock=flock");
713 else
714 seq_printf(m, ",local_lock=posix");
715 }
716
717 /*
718 * Describe the mount options on this VFS mountpoint
719 */
720 int nfs_show_options(struct seq_file *m, struct dentry *root)
721 {
722 struct nfs_server *nfss = NFS_SB(root->d_sb);
723
724 nfs_show_mount_options(m, nfss, 0);
725
726 rcu_read_lock();
727 seq_printf(m, ",addr=%s",
728 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
729 RPC_DISPLAY_ADDR));
730 rcu_read_unlock();
731
732 return 0;
733 }
734 EXPORT_SYMBOL_GPL(nfs_show_options);
735
736 #if IS_ENABLED(CONFIG_NFS_V4)
737 #ifdef CONFIG_NFS_V4_1
738 static void show_sessions(struct seq_file *m, struct nfs_server *server)
739 {
740 if (nfs4_has_session(server->nfs_client))
741 seq_printf(m, ",sessions");
742 }
743 #else
744 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
745 #endif
746 #endif
747
748 #ifdef CONFIG_NFS_V4_1
749 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
750 {
751 seq_printf(m, ",pnfs=");
752 if (server->pnfs_curr_ld)
753 seq_printf(m, "%s", server->pnfs_curr_ld->name);
754 else
755 seq_printf(m, "not configured");
756 }
757
758 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
759 {
760 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
761 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
762 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
763 "date='%llu,%u'",
764 impl_id->name, impl_id->domain,
765 impl_id->date.seconds, impl_id->date.nseconds);
766 }
767 }
768 #else
769 #if IS_ENABLED(CONFIG_NFS_V4)
770 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
771 {
772 }
773 #endif
774 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
775 {
776 }
777 #endif
778
779 int nfs_show_devname(struct seq_file *m, struct dentry *root)
780 {
781 char *page = (char *) __get_free_page(GFP_KERNEL);
782 char *devname, *dummy;
783 int err = 0;
784 if (!page)
785 return -ENOMEM;
786 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
787 if (IS_ERR(devname))
788 err = PTR_ERR(devname);
789 else
790 seq_escape(m, devname, " \t\n\\");
791 free_page((unsigned long)page);
792 return err;
793 }
794 EXPORT_SYMBOL_GPL(nfs_show_devname);
795
796 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
797 {
798 seq_puts(m, "/");
799 return 0;
800 }
801 EXPORT_SYMBOL_GPL(nfs_show_path);
802
803 /*
804 * Present statistical information for this VFS mountpoint
805 */
806 int nfs_show_stats(struct seq_file *m, struct dentry *root)
807 {
808 int i, cpu;
809 struct nfs_server *nfss = NFS_SB(root->d_sb);
810 struct rpc_auth *auth = nfss->client->cl_auth;
811 struct nfs_iostats totals = { };
812
813 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
814
815 /*
816 * Display all mount option settings
817 */
818 seq_printf(m, "\n\topts:\t");
819 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
820 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
821 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
822 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
823 nfs_show_mount_options(m, nfss, 1);
824
825 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
826
827 show_implementation_id(m, nfss);
828
829 seq_printf(m, "\n\tcaps:\t");
830 seq_printf(m, "caps=0x%x", nfss->caps);
831 seq_printf(m, ",wtmult=%u", nfss->wtmult);
832 seq_printf(m, ",dtsize=%u", nfss->dtsize);
833 seq_printf(m, ",bsize=%u", nfss->bsize);
834 seq_printf(m, ",namlen=%u", nfss->namelen);
835
836 #if IS_ENABLED(CONFIG_NFS_V4)
837 if (nfss->nfs_client->rpc_ops->version == 4) {
838 seq_printf(m, "\n\tnfsv4:\t");
839 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
840 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
841 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
842 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
843 show_sessions(m, nfss);
844 show_pnfs(m, nfss);
845 }
846 #endif
847
848 /*
849 * Display security flavor in effect for this mount
850 */
851 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
852 if (auth->au_flavor)
853 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
854
855 /*
856 * Display superblock I/O counters
857 */
858 for_each_possible_cpu(cpu) {
859 struct nfs_iostats *stats;
860
861 preempt_disable();
862 stats = per_cpu_ptr(nfss->io_stats, cpu);
863
864 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
865 totals.events[i] += stats->events[i];
866 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
867 totals.bytes[i] += stats->bytes[i];
868 #ifdef CONFIG_NFS_FSCACHE
869 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
870 totals.fscache[i] += stats->fscache[i];
871 #endif
872
873 preempt_enable();
874 }
875
876 seq_printf(m, "\n\tevents:\t");
877 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
878 seq_printf(m, "%lu ", totals.events[i]);
879 seq_printf(m, "\n\tbytes:\t");
880 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
881 seq_printf(m, "%Lu ", totals.bytes[i]);
882 #ifdef CONFIG_NFS_FSCACHE
883 if (nfss->options & NFS_OPTION_FSCACHE) {
884 seq_printf(m, "\n\tfsc:\t");
885 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
886 seq_printf(m, "%Lu ", totals.bytes[i]);
887 }
888 #endif
889 seq_printf(m, "\n");
890
891 rpc_print_iostats(m, nfss->client);
892
893 return 0;
894 }
895 EXPORT_SYMBOL_GPL(nfs_show_stats);
896
897 /*
898 * Begin unmount by attempting to remove all automounted mountpoints we added
899 * in response to xdev traversals and referrals
900 */
901 void nfs_umount_begin(struct super_block *sb)
902 {
903 struct nfs_server *server;
904 struct rpc_clnt *rpc;
905
906 server = NFS_SB(sb);
907 /* -EIO all pending I/O */
908 rpc = server->client_acl;
909 if (!IS_ERR(rpc))
910 rpc_killall_tasks(rpc);
911 rpc = server->client;
912 if (!IS_ERR(rpc))
913 rpc_killall_tasks(rpc);
914 }
915 EXPORT_SYMBOL_GPL(nfs_umount_begin);
916
917 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
918 {
919 struct nfs_parsed_mount_data *data;
920
921 data = kzalloc(sizeof(*data), GFP_KERNEL);
922 if (data) {
923 data->acregmin = NFS_DEF_ACREGMIN;
924 data->acregmax = NFS_DEF_ACREGMAX;
925 data->acdirmin = NFS_DEF_ACDIRMIN;
926 data->acdirmax = NFS_DEF_ACDIRMAX;
927 data->mount_server.port = NFS_UNSPEC_PORT;
928 data->nfs_server.port = NFS_UNSPEC_PORT;
929 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
930 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
931 data->minorversion = 0;
932 data->need_mount = true;
933 data->net = current->nsproxy->net_ns;
934 security_init_mnt_opts(&data->lsm_opts);
935 }
936 return data;
937 }
938
939 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
940 {
941 if (data) {
942 kfree(data->client_address);
943 kfree(data->mount_server.hostname);
944 kfree(data->nfs_server.export_path);
945 kfree(data->nfs_server.hostname);
946 kfree(data->fscache_uniq);
947 security_free_mnt_opts(&data->lsm_opts);
948 kfree(data);
949 }
950 }
951
952 /*
953 * Sanity-check a server address provided by the mount command.
954 *
955 * Address family must be initialized, and address must not be
956 * the ANY address for that family.
957 */
958 static int nfs_verify_server_address(struct sockaddr *addr)
959 {
960 switch (addr->sa_family) {
961 case AF_INET: {
962 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
963 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
964 }
965 case AF_INET6: {
966 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
967 return !ipv6_addr_any(sa);
968 }
969 }
970
971 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
972 return 0;
973 }
974
975 /*
976 * Select between a default port value and a user-specified port value.
977 * If a zero value is set, then autobind will be used.
978 */
979 static void nfs_set_port(struct sockaddr *sap, int *port,
980 const unsigned short default_port)
981 {
982 if (*port == NFS_UNSPEC_PORT)
983 *port = default_port;
984
985 rpc_set_port(sap, *port);
986 }
987
988 /*
989 * Sanity check the NFS transport protocol.
990 *
991 */
992 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
993 {
994 switch (mnt->nfs_server.protocol) {
995 case XPRT_TRANSPORT_UDP:
996 case XPRT_TRANSPORT_TCP:
997 case XPRT_TRANSPORT_RDMA:
998 break;
999 default:
1000 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1001 }
1002 }
1003
1004 /*
1005 * For text based NFSv2/v3 mounts, the mount protocol transport default
1006 * settings should depend upon the specified NFS transport.
1007 */
1008 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1009 {
1010 nfs_validate_transport_protocol(mnt);
1011
1012 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1013 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1014 return;
1015 switch (mnt->nfs_server.protocol) {
1016 case XPRT_TRANSPORT_UDP:
1017 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1018 break;
1019 case XPRT_TRANSPORT_TCP:
1020 case XPRT_TRANSPORT_RDMA:
1021 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1022 }
1023 }
1024
1025 /*
1026 * Add 'flavor' to 'auth_info' if not already present.
1027 * Returns true if 'flavor' ends up in the list, false otherwise
1028 */
1029 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1030 rpc_authflavor_t flavor)
1031 {
1032 unsigned int i;
1033 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1034
1035 /* make sure this flavor isn't already in the list */
1036 for (i = 0; i < auth_info->flavor_len; i++) {
1037 if (flavor == auth_info->flavors[i])
1038 return true;
1039 }
1040
1041 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1042 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1043 return false;
1044 }
1045
1046 auth_info->flavors[auth_info->flavor_len++] = flavor;
1047 return true;
1048 }
1049
1050 /*
1051 * Return true if 'match' is in auth_info or auth_info is empty.
1052 * Return false otherwise.
1053 */
1054 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1055 rpc_authflavor_t match)
1056 {
1057 int i;
1058
1059 if (!auth_info->flavor_len)
1060 return true;
1061
1062 for (i = 0; i < auth_info->flavor_len; i++) {
1063 if (auth_info->flavors[i] == match)
1064 return true;
1065 }
1066 return false;
1067 }
1068 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1069
1070 /*
1071 * Parse the value of the 'sec=' option.
1072 */
1073 static int nfs_parse_security_flavors(char *value,
1074 struct nfs_parsed_mount_data *mnt)
1075 {
1076 substring_t args[MAX_OPT_ARGS];
1077 rpc_authflavor_t pseudoflavor;
1078 char *p;
1079
1080 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1081
1082 while ((p = strsep(&value, ":")) != NULL) {
1083 switch (match_token(p, nfs_secflavor_tokens, args)) {
1084 case Opt_sec_none:
1085 pseudoflavor = RPC_AUTH_NULL;
1086 break;
1087 case Opt_sec_sys:
1088 pseudoflavor = RPC_AUTH_UNIX;
1089 break;
1090 case Opt_sec_krb5:
1091 pseudoflavor = RPC_AUTH_GSS_KRB5;
1092 break;
1093 case Opt_sec_krb5i:
1094 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1095 break;
1096 case Opt_sec_krb5p:
1097 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1098 break;
1099 case Opt_sec_lkey:
1100 pseudoflavor = RPC_AUTH_GSS_LKEY;
1101 break;
1102 case Opt_sec_lkeyi:
1103 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1104 break;
1105 case Opt_sec_lkeyp:
1106 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1107 break;
1108 case Opt_sec_spkm:
1109 pseudoflavor = RPC_AUTH_GSS_SPKM;
1110 break;
1111 case Opt_sec_spkmi:
1112 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1113 break;
1114 case Opt_sec_spkmp:
1115 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1116 break;
1117 default:
1118 dfprintk(MOUNT,
1119 "NFS: sec= option '%s' not recognized\n", p);
1120 return 0;
1121 }
1122
1123 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1124 return 0;
1125 }
1126
1127 return 1;
1128 }
1129
1130 static int nfs_parse_version_string(char *string,
1131 struct nfs_parsed_mount_data *mnt,
1132 substring_t *args)
1133 {
1134 mnt->flags &= ~NFS_MOUNT_VER3;
1135 switch (match_token(string, nfs_vers_tokens, args)) {
1136 case Opt_vers_2:
1137 mnt->version = 2;
1138 break;
1139 case Opt_vers_3:
1140 mnt->flags |= NFS_MOUNT_VER3;
1141 mnt->version = 3;
1142 break;
1143 case Opt_vers_4:
1144 /* Backward compatibility option. In future,
1145 * the mount program should always supply
1146 * a NFSv4 minor version number.
1147 */
1148 mnt->version = 4;
1149 break;
1150 case Opt_vers_4_0:
1151 mnt->version = 4;
1152 mnt->minorversion = 0;
1153 break;
1154 case Opt_vers_4_1:
1155 mnt->version = 4;
1156 mnt->minorversion = 1;
1157 break;
1158 case Opt_vers_4_2:
1159 mnt->version = 4;
1160 mnt->minorversion = 2;
1161 break;
1162 default:
1163 return 0;
1164 }
1165 return 1;
1166 }
1167
1168 static int nfs_get_option_str(substring_t args[], char **option)
1169 {
1170 kfree(*option);
1171 *option = match_strdup(args);
1172 return !*option;
1173 }
1174
1175 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1176 {
1177 int rc;
1178 char *string;
1179
1180 string = match_strdup(args);
1181 if (string == NULL)
1182 return -ENOMEM;
1183 rc = kstrtoul(string, 10, option);
1184 kfree(string);
1185
1186 return rc;
1187 }
1188
1189 /*
1190 * Error-check and convert a string of mount options from user space into
1191 * a data structure. The whole mount string is processed; bad options are
1192 * skipped as they are encountered. If there were no errors, return 1;
1193 * otherwise return 0 (zero).
1194 */
1195 static int nfs_parse_mount_options(char *raw,
1196 struct nfs_parsed_mount_data *mnt)
1197 {
1198 char *p, *string, *secdata;
1199 int rc, sloppy = 0, invalid_option = 0;
1200 unsigned short protofamily = AF_UNSPEC;
1201 unsigned short mountfamily = AF_UNSPEC;
1202
1203 if (!raw) {
1204 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1205 return 1;
1206 }
1207 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1208
1209 secdata = alloc_secdata();
1210 if (!secdata)
1211 goto out_nomem;
1212
1213 rc = security_sb_copy_data(raw, secdata);
1214 if (rc)
1215 goto out_security_failure;
1216
1217 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1218 if (rc)
1219 goto out_security_failure;
1220
1221 free_secdata(secdata);
1222
1223 while ((p = strsep(&raw, ",")) != NULL) {
1224 substring_t args[MAX_OPT_ARGS];
1225 unsigned long option;
1226 int token;
1227
1228 if (!*p)
1229 continue;
1230
1231 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1232
1233 token = match_token(p, nfs_mount_option_tokens, args);
1234 switch (token) {
1235
1236 /*
1237 * boolean options: foo/nofoo
1238 */
1239 case Opt_soft:
1240 mnt->flags |= NFS_MOUNT_SOFT;
1241 break;
1242 case Opt_hard:
1243 mnt->flags &= ~NFS_MOUNT_SOFT;
1244 break;
1245 case Opt_posix:
1246 mnt->flags |= NFS_MOUNT_POSIX;
1247 break;
1248 case Opt_noposix:
1249 mnt->flags &= ~NFS_MOUNT_POSIX;
1250 break;
1251 case Opt_cto:
1252 mnt->flags &= ~NFS_MOUNT_NOCTO;
1253 break;
1254 case Opt_nocto:
1255 mnt->flags |= NFS_MOUNT_NOCTO;
1256 break;
1257 case Opt_ac:
1258 mnt->flags &= ~NFS_MOUNT_NOAC;
1259 break;
1260 case Opt_noac:
1261 mnt->flags |= NFS_MOUNT_NOAC;
1262 break;
1263 case Opt_lock:
1264 mnt->flags &= ~NFS_MOUNT_NONLM;
1265 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1266 NFS_MOUNT_LOCAL_FCNTL);
1267 break;
1268 case Opt_nolock:
1269 mnt->flags |= NFS_MOUNT_NONLM;
1270 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1271 NFS_MOUNT_LOCAL_FCNTL);
1272 break;
1273 case Opt_udp:
1274 mnt->flags &= ~NFS_MOUNT_TCP;
1275 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1276 break;
1277 case Opt_tcp:
1278 mnt->flags |= NFS_MOUNT_TCP;
1279 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1280 break;
1281 case Opt_rdma:
1282 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1283 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1284 xprt_load_transport(p);
1285 break;
1286 case Opt_acl:
1287 mnt->flags &= ~NFS_MOUNT_NOACL;
1288 break;
1289 case Opt_noacl:
1290 mnt->flags |= NFS_MOUNT_NOACL;
1291 break;
1292 case Opt_rdirplus:
1293 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1294 break;
1295 case Opt_nordirplus:
1296 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1297 break;
1298 case Opt_sharecache:
1299 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1300 break;
1301 case Opt_nosharecache:
1302 mnt->flags |= NFS_MOUNT_UNSHARED;
1303 break;
1304 case Opt_resvport:
1305 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1306 break;
1307 case Opt_noresvport:
1308 mnt->flags |= NFS_MOUNT_NORESVPORT;
1309 break;
1310 case Opt_fscache:
1311 mnt->options |= NFS_OPTION_FSCACHE;
1312 kfree(mnt->fscache_uniq);
1313 mnt->fscache_uniq = NULL;
1314 break;
1315 case Opt_nofscache:
1316 mnt->options &= ~NFS_OPTION_FSCACHE;
1317 kfree(mnt->fscache_uniq);
1318 mnt->fscache_uniq = NULL;
1319 break;
1320 case Opt_migration:
1321 mnt->options |= NFS_OPTION_MIGRATION;
1322 break;
1323 case Opt_nomigration:
1324 mnt->options &= NFS_OPTION_MIGRATION;
1325 break;
1326
1327 /*
1328 * options that take numeric values
1329 */
1330 case Opt_port:
1331 if (nfs_get_option_ul(args, &option) ||
1332 option > USHRT_MAX)
1333 goto out_invalid_value;
1334 mnt->nfs_server.port = option;
1335 break;
1336 case Opt_rsize:
1337 if (nfs_get_option_ul(args, &option))
1338 goto out_invalid_value;
1339 mnt->rsize = option;
1340 break;
1341 case Opt_wsize:
1342 if (nfs_get_option_ul(args, &option))
1343 goto out_invalid_value;
1344 mnt->wsize = option;
1345 break;
1346 case Opt_bsize:
1347 if (nfs_get_option_ul(args, &option))
1348 goto out_invalid_value;
1349 mnt->bsize = option;
1350 break;
1351 case Opt_timeo:
1352 if (nfs_get_option_ul(args, &option) || option == 0)
1353 goto out_invalid_value;
1354 mnt->timeo = option;
1355 break;
1356 case Opt_retrans:
1357 if (nfs_get_option_ul(args, &option) || option == 0)
1358 goto out_invalid_value;
1359 mnt->retrans = option;
1360 break;
1361 case Opt_acregmin:
1362 if (nfs_get_option_ul(args, &option))
1363 goto out_invalid_value;
1364 mnt->acregmin = option;
1365 break;
1366 case Opt_acregmax:
1367 if (nfs_get_option_ul(args, &option))
1368 goto out_invalid_value;
1369 mnt->acregmax = option;
1370 break;
1371 case Opt_acdirmin:
1372 if (nfs_get_option_ul(args, &option))
1373 goto out_invalid_value;
1374 mnt->acdirmin = option;
1375 break;
1376 case Opt_acdirmax:
1377 if (nfs_get_option_ul(args, &option))
1378 goto out_invalid_value;
1379 mnt->acdirmax = option;
1380 break;
1381 case Opt_actimeo:
1382 if (nfs_get_option_ul(args, &option))
1383 goto out_invalid_value;
1384 mnt->acregmin = mnt->acregmax =
1385 mnt->acdirmin = mnt->acdirmax = option;
1386 break;
1387 case Opt_namelen:
1388 if (nfs_get_option_ul(args, &option))
1389 goto out_invalid_value;
1390 mnt->namlen = option;
1391 break;
1392 case Opt_mountport:
1393 if (nfs_get_option_ul(args, &option) ||
1394 option > USHRT_MAX)
1395 goto out_invalid_value;
1396 mnt->mount_server.port = option;
1397 break;
1398 case Opt_mountvers:
1399 if (nfs_get_option_ul(args, &option) ||
1400 option < NFS_MNT_VERSION ||
1401 option > NFS_MNT3_VERSION)
1402 goto out_invalid_value;
1403 mnt->mount_server.version = option;
1404 break;
1405 case Opt_minorversion:
1406 if (nfs_get_option_ul(args, &option))
1407 goto out_invalid_value;
1408 if (option > NFS4_MAX_MINOR_VERSION)
1409 goto out_invalid_value;
1410 mnt->minorversion = option;
1411 break;
1412
1413 /*
1414 * options that take text values
1415 */
1416 case Opt_nfsvers:
1417 string = match_strdup(args);
1418 if (string == NULL)
1419 goto out_nomem;
1420 rc = nfs_parse_version_string(string, mnt, args);
1421 kfree(string);
1422 if (!rc)
1423 goto out_invalid_value;
1424 break;
1425 case Opt_sec:
1426 string = match_strdup(args);
1427 if (string == NULL)
1428 goto out_nomem;
1429 rc = nfs_parse_security_flavors(string, mnt);
1430 kfree(string);
1431 if (!rc) {
1432 dfprintk(MOUNT, "NFS: unrecognized "
1433 "security flavor\n");
1434 return 0;
1435 }
1436 break;
1437 case Opt_proto:
1438 string = match_strdup(args);
1439 if (string == NULL)
1440 goto out_nomem;
1441 token = match_token(string,
1442 nfs_xprt_protocol_tokens, args);
1443
1444 protofamily = AF_INET;
1445 switch (token) {
1446 case Opt_xprt_udp6:
1447 protofamily = AF_INET6;
1448 case Opt_xprt_udp:
1449 mnt->flags &= ~NFS_MOUNT_TCP;
1450 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1451 break;
1452 case Opt_xprt_tcp6:
1453 protofamily = AF_INET6;
1454 case Opt_xprt_tcp:
1455 mnt->flags |= NFS_MOUNT_TCP;
1456 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1457 break;
1458 case Opt_xprt_rdma:
1459 /* vector side protocols to TCP */
1460 mnt->flags |= NFS_MOUNT_TCP;
1461 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1462 xprt_load_transport(string);
1463 break;
1464 default:
1465 dfprintk(MOUNT, "NFS: unrecognized "
1466 "transport protocol\n");
1467 kfree(string);
1468 return 0;
1469 }
1470 kfree(string);
1471 break;
1472 case Opt_mountproto:
1473 string = match_strdup(args);
1474 if (string == NULL)
1475 goto out_nomem;
1476 token = match_token(string,
1477 nfs_xprt_protocol_tokens, args);
1478 kfree(string);
1479
1480 mountfamily = AF_INET;
1481 switch (token) {
1482 case Opt_xprt_udp6:
1483 mountfamily = AF_INET6;
1484 case Opt_xprt_udp:
1485 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1486 break;
1487 case Opt_xprt_tcp6:
1488 mountfamily = AF_INET6;
1489 case Opt_xprt_tcp:
1490 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1491 break;
1492 case Opt_xprt_rdma: /* not used for side protocols */
1493 default:
1494 dfprintk(MOUNT, "NFS: unrecognized "
1495 "transport protocol\n");
1496 return 0;
1497 }
1498 break;
1499 case Opt_addr:
1500 string = match_strdup(args);
1501 if (string == NULL)
1502 goto out_nomem;
1503 mnt->nfs_server.addrlen =
1504 rpc_pton(mnt->net, string, strlen(string),
1505 (struct sockaddr *)
1506 &mnt->nfs_server.address,
1507 sizeof(mnt->nfs_server.address));
1508 kfree(string);
1509 if (mnt->nfs_server.addrlen == 0)
1510 goto out_invalid_address;
1511 break;
1512 case Opt_clientaddr:
1513 if (nfs_get_option_str(args, &mnt->client_address))
1514 goto out_nomem;
1515 break;
1516 case Opt_mounthost:
1517 if (nfs_get_option_str(args,
1518 &mnt->mount_server.hostname))
1519 goto out_nomem;
1520 break;
1521 case Opt_mountaddr:
1522 string = match_strdup(args);
1523 if (string == NULL)
1524 goto out_nomem;
1525 mnt->mount_server.addrlen =
1526 rpc_pton(mnt->net, string, strlen(string),
1527 (struct sockaddr *)
1528 &mnt->mount_server.address,
1529 sizeof(mnt->mount_server.address));
1530 kfree(string);
1531 if (mnt->mount_server.addrlen == 0)
1532 goto out_invalid_address;
1533 break;
1534 case Opt_lookupcache:
1535 string = match_strdup(args);
1536 if (string == NULL)
1537 goto out_nomem;
1538 token = match_token(string,
1539 nfs_lookupcache_tokens, args);
1540 kfree(string);
1541 switch (token) {
1542 case Opt_lookupcache_all:
1543 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1544 break;
1545 case Opt_lookupcache_positive:
1546 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1547 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1548 break;
1549 case Opt_lookupcache_none:
1550 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1551 break;
1552 default:
1553 dfprintk(MOUNT, "NFS: invalid "
1554 "lookupcache argument\n");
1555 return 0;
1556 };
1557 break;
1558 case Opt_fscache_uniq:
1559 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1560 goto out_nomem;
1561 mnt->options |= NFS_OPTION_FSCACHE;
1562 break;
1563 case Opt_local_lock:
1564 string = match_strdup(args);
1565 if (string == NULL)
1566 goto out_nomem;
1567 token = match_token(string, nfs_local_lock_tokens,
1568 args);
1569 kfree(string);
1570 switch (token) {
1571 case Opt_local_lock_all:
1572 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1573 NFS_MOUNT_LOCAL_FCNTL);
1574 break;
1575 case Opt_local_lock_flock:
1576 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1577 break;
1578 case Opt_local_lock_posix:
1579 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1580 break;
1581 case Opt_local_lock_none:
1582 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1583 NFS_MOUNT_LOCAL_FCNTL);
1584 break;
1585 default:
1586 dfprintk(MOUNT, "NFS: invalid "
1587 "local_lock argument\n");
1588 return 0;
1589 };
1590 break;
1591
1592 /*
1593 * Special options
1594 */
1595 case Opt_sloppy:
1596 sloppy = 1;
1597 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1598 break;
1599 case Opt_userspace:
1600 case Opt_deprecated:
1601 dfprintk(MOUNT, "NFS: ignoring mount option "
1602 "'%s'\n", p);
1603 break;
1604
1605 default:
1606 invalid_option = 1;
1607 dfprintk(MOUNT, "NFS: unrecognized mount option "
1608 "'%s'\n", p);
1609 }
1610 }
1611
1612 if (!sloppy && invalid_option)
1613 return 0;
1614
1615 if (mnt->minorversion && mnt->version != 4)
1616 goto out_minorversion_mismatch;
1617
1618 if (mnt->options & NFS_OPTION_MIGRATION &&
1619 (mnt->version != 4 || mnt->minorversion != 0))
1620 goto out_migration_misuse;
1621
1622 /*
1623 * verify that any proto=/mountproto= options match the address
1624 * families in the addr=/mountaddr= options.
1625 */
1626 if (protofamily != AF_UNSPEC &&
1627 protofamily != mnt->nfs_server.address.ss_family)
1628 goto out_proto_mismatch;
1629
1630 if (mountfamily != AF_UNSPEC) {
1631 if (mnt->mount_server.addrlen) {
1632 if (mountfamily != mnt->mount_server.address.ss_family)
1633 goto out_mountproto_mismatch;
1634 } else {
1635 if (mountfamily != mnt->nfs_server.address.ss_family)
1636 goto out_mountproto_mismatch;
1637 }
1638 }
1639
1640 return 1;
1641
1642 out_mountproto_mismatch:
1643 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1644 "option\n");
1645 return 0;
1646 out_proto_mismatch:
1647 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1648 return 0;
1649 out_invalid_address:
1650 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1651 return 0;
1652 out_invalid_value:
1653 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1654 return 0;
1655 out_minorversion_mismatch:
1656 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1657 "minorversion=%u\n", mnt->version, mnt->minorversion);
1658 return 0;
1659 out_migration_misuse:
1660 printk(KERN_INFO
1661 "NFS: 'migration' not supported for this NFS version\n");
1662 return 0;
1663 out_nomem:
1664 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1665 return 0;
1666 out_security_failure:
1667 free_secdata(secdata);
1668 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1669 return 0;
1670 }
1671
1672 /*
1673 * Ensure that a specified authtype in args->auth_info is supported by
1674 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1675 * -EACCES if not.
1676 */
1677 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1678 rpc_authflavor_t *server_authlist, unsigned int count)
1679 {
1680 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1681 unsigned int i;
1682
1683 /*
1684 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1685 * must be in the list returned by the server.
1686 *
1687 * AUTH_NULL has a special meaning when it's in the server list - it
1688 * means that the server will ignore the rpc creds, so any flavor
1689 * can be used.
1690 */
1691 for (i = 0; i < count; i++) {
1692 flavor = server_authlist[i];
1693
1694 if (nfs_auth_info_match(&args->auth_info, flavor) ||
1695 flavor == RPC_AUTH_NULL)
1696 goto out;
1697 }
1698
1699 dfprintk(MOUNT,
1700 "NFS: specified auth flavors not supported by server\n");
1701 return -EACCES;
1702
1703 out:
1704 args->selected_flavor = flavor;
1705 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1706 return 0;
1707 }
1708
1709 /*
1710 * Use the remote server's MOUNT service to request the NFS file handle
1711 * corresponding to the provided path.
1712 */
1713 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1714 struct nfs_fh *root_fh,
1715 rpc_authflavor_t *server_authlist,
1716 unsigned int *server_authlist_len)
1717 {
1718 struct nfs_mount_request request = {
1719 .sap = (struct sockaddr *)
1720 &args->mount_server.address,
1721 .dirpath = args->nfs_server.export_path,
1722 .protocol = args->mount_server.protocol,
1723 .fh = root_fh,
1724 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1725 .auth_flav_len = server_authlist_len,
1726 .auth_flavs = server_authlist,
1727 .net = args->net,
1728 };
1729 int status;
1730
1731 if (args->mount_server.version == 0) {
1732 switch (args->version) {
1733 default:
1734 args->mount_server.version = NFS_MNT3_VERSION;
1735 break;
1736 case 2:
1737 args->mount_server.version = NFS_MNT_VERSION;
1738 }
1739 }
1740 request.version = args->mount_server.version;
1741
1742 if (args->mount_server.hostname)
1743 request.hostname = args->mount_server.hostname;
1744 else
1745 request.hostname = args->nfs_server.hostname;
1746
1747 /*
1748 * Construct the mount server's address.
1749 */
1750 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1751 memcpy(request.sap, &args->nfs_server.address,
1752 args->nfs_server.addrlen);
1753 args->mount_server.addrlen = args->nfs_server.addrlen;
1754 }
1755 request.salen = args->mount_server.addrlen;
1756 nfs_set_port(request.sap, &args->mount_server.port, 0);
1757
1758 /*
1759 * Now ask the mount server to map our export path
1760 * to a file handle.
1761 */
1762 status = nfs_mount(&request);
1763 if (status != 0) {
1764 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1765 request.hostname, status);
1766 return status;
1767 }
1768
1769 return 0;
1770 }
1771
1772 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1773 struct nfs_subversion *nfs_mod)
1774 {
1775 int status;
1776 unsigned int i;
1777 bool tried_auth_unix = false;
1778 bool auth_null_in_list = false;
1779 struct nfs_server *server = ERR_PTR(-EACCES);
1780 struct nfs_parsed_mount_data *args = mount_info->parsed;
1781 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1782 unsigned int authlist_len = ARRAY_SIZE(authlist);
1783
1784 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1785 &authlist_len);
1786 if (status)
1787 return ERR_PTR(status);
1788
1789 /*
1790 * Was a sec= authflavor specified in the options? First, verify
1791 * whether the server supports it, and then just try to use it if so.
1792 */
1793 if (args->auth_info.flavor_len > 0) {
1794 status = nfs_verify_authflavors(args, authlist, authlist_len);
1795 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1796 args->selected_flavor);
1797 if (status)
1798 return ERR_PTR(status);
1799 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1800 }
1801
1802 /*
1803 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1804 * SHOULD prefer the flavor listed first. However, some servers list
1805 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1806 */
1807 for (i = 0; i < authlist_len; ++i) {
1808 rpc_authflavor_t flavor;
1809 struct rpcsec_gss_info info;
1810
1811 flavor = authlist[i];
1812 switch (flavor) {
1813 case RPC_AUTH_UNIX:
1814 tried_auth_unix = true;
1815 break;
1816 case RPC_AUTH_NULL:
1817 auth_null_in_list = true;
1818 continue;
1819 default:
1820 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1821 continue;
1822 /* Fallthrough */
1823 }
1824 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1825 args->selected_flavor = flavor;
1826 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1827 if (!IS_ERR(server))
1828 return server;
1829 }
1830
1831 /*
1832 * Nothing we tried so far worked. At this point, give up if we've
1833 * already tried AUTH_UNIX or if the server's list doesn't contain
1834 * AUTH_NULL
1835 */
1836 if (tried_auth_unix || !auth_null_in_list)
1837 return server;
1838
1839 /* Last chance! Try AUTH_UNIX */
1840 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1841 args->selected_flavor = RPC_AUTH_UNIX;
1842 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1843 }
1844
1845 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1846 struct nfs_mount_info *mount_info,
1847 struct nfs_subversion *nfs_mod)
1848 {
1849 struct nfs_server *server;
1850
1851 if (mount_info->parsed->need_mount)
1852 server = nfs_try_mount_request(mount_info, nfs_mod);
1853 else
1854 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1855
1856 if (IS_ERR(server))
1857 return ERR_CAST(server);
1858
1859 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1860 }
1861 EXPORT_SYMBOL_GPL(nfs_try_mount);
1862
1863 /*
1864 * Split "dev_name" into "hostname:export_path".
1865 *
1866 * The leftmost colon demarks the split between the server's hostname
1867 * and the export path. If the hostname starts with a left square
1868 * bracket, then it may contain colons.
1869 *
1870 * Note: caller frees hostname and export path, even on error.
1871 */
1872 static int nfs_parse_devname(const char *dev_name,
1873 char **hostname, size_t maxnamlen,
1874 char **export_path, size_t maxpathlen)
1875 {
1876 size_t len;
1877 char *end;
1878
1879 /* Is the host name protected with square brakcets? */
1880 if (*dev_name == '[') {
1881 end = strchr(++dev_name, ']');
1882 if (end == NULL || end[1] != ':')
1883 goto out_bad_devname;
1884
1885 len = end - dev_name;
1886 end++;
1887 } else {
1888 char *comma;
1889
1890 end = strchr(dev_name, ':');
1891 if (end == NULL)
1892 goto out_bad_devname;
1893 len = end - dev_name;
1894
1895 /* kill possible hostname list: not supported */
1896 comma = strchr(dev_name, ',');
1897 if (comma != NULL && comma < end)
1898 *comma = 0;
1899 }
1900
1901 if (len > maxnamlen)
1902 goto out_hostname;
1903
1904 /* N.B. caller will free nfs_server.hostname in all cases */
1905 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1906 if (*hostname == NULL)
1907 goto out_nomem;
1908 len = strlen(++end);
1909 if (len > maxpathlen)
1910 goto out_path;
1911 *export_path = kstrndup(end, len, GFP_KERNEL);
1912 if (!*export_path)
1913 goto out_nomem;
1914
1915 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1916 return 0;
1917
1918 out_bad_devname:
1919 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1920 return -EINVAL;
1921
1922 out_nomem:
1923 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1924 return -ENOMEM;
1925
1926 out_hostname:
1927 dfprintk(MOUNT, "NFS: server hostname too long\n");
1928 return -ENAMETOOLONG;
1929
1930 out_path:
1931 dfprintk(MOUNT, "NFS: export pathname too long\n");
1932 return -ENAMETOOLONG;
1933 }
1934
1935 /*
1936 * Validate the NFS2/NFS3 mount data
1937 * - fills in the mount root filehandle
1938 *
1939 * For option strings, user space handles the following behaviors:
1940 *
1941 * + DNS: mapping server host name to IP address ("addr=" option)
1942 *
1943 * + failure mode: how to behave if a mount request can't be handled
1944 * immediately ("fg/bg" option)
1945 *
1946 * + retry: how often to retry a mount request ("retry=" option)
1947 *
1948 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1949 * mountproto=tcp after mountproto=udp, and so on
1950 */
1951 static int nfs23_validate_mount_data(void *options,
1952 struct nfs_parsed_mount_data *args,
1953 struct nfs_fh *mntfh,
1954 const char *dev_name)
1955 {
1956 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1957 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1958 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1959
1960 if (data == NULL)
1961 goto out_no_data;
1962
1963 args->version = NFS_DEFAULT_VERSION;
1964 switch (data->version) {
1965 case 1:
1966 data->namlen = 0;
1967 case 2:
1968 data->bsize = 0;
1969 case 3:
1970 if (data->flags & NFS_MOUNT_VER3)
1971 goto out_no_v3;
1972 data->root.size = NFS2_FHSIZE;
1973 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1974 /* Turn off security negotiation */
1975 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1976 case 4:
1977 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1978 goto out_no_sec;
1979 case 5:
1980 memset(data->context, 0, sizeof(data->context));
1981 case 6:
1982 if (data->flags & NFS_MOUNT_VER3) {
1983 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1984 goto out_invalid_fh;
1985 mntfh->size = data->root.size;
1986 args->version = 3;
1987 } else {
1988 mntfh->size = NFS2_FHSIZE;
1989 args->version = 2;
1990 }
1991
1992
1993 memcpy(mntfh->data, data->root.data, mntfh->size);
1994 if (mntfh->size < sizeof(mntfh->data))
1995 memset(mntfh->data + mntfh->size, 0,
1996 sizeof(mntfh->data) - mntfh->size);
1997
1998 /*
1999 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2000 * can deal with.
2001 */
2002 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2003 args->flags |= extra_flags;
2004 args->rsize = data->rsize;
2005 args->wsize = data->wsize;
2006 args->timeo = data->timeo;
2007 args->retrans = data->retrans;
2008 args->acregmin = data->acregmin;
2009 args->acregmax = data->acregmax;
2010 args->acdirmin = data->acdirmin;
2011 args->acdirmax = data->acdirmax;
2012 args->need_mount = false;
2013
2014 memcpy(sap, &data->addr, sizeof(data->addr));
2015 args->nfs_server.addrlen = sizeof(data->addr);
2016 args->nfs_server.port = ntohs(data->addr.sin_port);
2017 if (!nfs_verify_server_address(sap))
2018 goto out_no_address;
2019
2020 if (!(data->flags & NFS_MOUNT_TCP))
2021 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2022 /* N.B. caller will free nfs_server.hostname in all cases */
2023 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2024 args->namlen = data->namlen;
2025 args->bsize = data->bsize;
2026
2027 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2028 args->selected_flavor = data->pseudoflavor;
2029 else
2030 args->selected_flavor = RPC_AUTH_UNIX;
2031 if (!args->nfs_server.hostname)
2032 goto out_nomem;
2033
2034 if (!(data->flags & NFS_MOUNT_NONLM))
2035 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2036 NFS_MOUNT_LOCAL_FCNTL);
2037 else
2038 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2039 NFS_MOUNT_LOCAL_FCNTL);
2040 /*
2041 * The legacy version 6 binary mount data from userspace has a
2042 * field used only to transport selinux information into the
2043 * the kernel. To continue to support that functionality we
2044 * have a touch of selinux knowledge here in the NFS code. The
2045 * userspace code converted context=blah to just blah so we are
2046 * converting back to the full string selinux understands.
2047 */
2048 if (data->context[0]){
2049 #ifdef CONFIG_SECURITY_SELINUX
2050 int rc;
2051 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2052 if (!opts_str)
2053 return -ENOMEM;
2054 strcpy(opts_str, "context=");
2055 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2056 strcat(opts_str, &data->context[0]);
2057 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2058 kfree(opts_str);
2059 if (rc)
2060 return rc;
2061 #else
2062 return -EINVAL;
2063 #endif
2064 }
2065
2066 break;
2067 default:
2068 return NFS_TEXT_DATA;
2069 }
2070
2071 return 0;
2072
2073 out_no_data:
2074 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2075 return -EINVAL;
2076
2077 out_no_v3:
2078 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2079 data->version);
2080 return -EINVAL;
2081
2082 out_no_sec:
2083 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2084 return -EINVAL;
2085
2086 out_nomem:
2087 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2088 return -ENOMEM;
2089
2090 out_no_address:
2091 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2092 return -EINVAL;
2093
2094 out_invalid_fh:
2095 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2096 return -EINVAL;
2097 }
2098
2099 #if IS_ENABLED(CONFIG_NFS_V4)
2100 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2101 void *options,
2102 struct nfs_parsed_mount_data *args,
2103 struct nfs_fh *mntfh,
2104 const char *dev_name)
2105 {
2106 if (fs_type == &nfs_fs_type)
2107 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2108 return nfs4_validate_mount_data(options, args, dev_name);
2109 }
2110 #else
2111 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2112 void *options,
2113 struct nfs_parsed_mount_data *args,
2114 struct nfs_fh *mntfh,
2115 const char *dev_name)
2116 {
2117 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2118 }
2119 #endif
2120
2121 static int nfs_validate_text_mount_data(void *options,
2122 struct nfs_parsed_mount_data *args,
2123 const char *dev_name)
2124 {
2125 int port = 0;
2126 int max_namelen = PAGE_SIZE;
2127 int max_pathlen = NFS_MAXPATHLEN;
2128 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2129
2130 if (nfs_parse_mount_options((char *)options, args) == 0)
2131 return -EINVAL;
2132
2133 if (!nfs_verify_server_address(sap))
2134 goto out_no_address;
2135
2136 if (args->version == 4) {
2137 #if IS_ENABLED(CONFIG_NFS_V4)
2138 port = NFS_PORT;
2139 max_namelen = NFS4_MAXNAMLEN;
2140 max_pathlen = NFS4_MAXPATHLEN;
2141 nfs_validate_transport_protocol(args);
2142 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2143 goto out_invalid_transport_udp;
2144 nfs4_validate_mount_flags(args);
2145 #else
2146 goto out_v4_not_compiled;
2147 #endif /* CONFIG_NFS_V4 */
2148 } else
2149 nfs_set_mount_transport_protocol(args);
2150
2151 nfs_set_port(sap, &args->nfs_server.port, port);
2152
2153 return nfs_parse_devname(dev_name,
2154 &args->nfs_server.hostname,
2155 max_namelen,
2156 &args->nfs_server.export_path,
2157 max_pathlen);
2158
2159 #if !IS_ENABLED(CONFIG_NFS_V4)
2160 out_v4_not_compiled:
2161 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2162 return -EPROTONOSUPPORT;
2163 #else
2164 out_invalid_transport_udp:
2165 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2166 return -EINVAL;
2167 #endif /* !CONFIG_NFS_V4 */
2168
2169 out_no_address:
2170 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2171 return -EINVAL;
2172 }
2173
2174 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2175 | NFS_MOUNT_SECURE \
2176 | NFS_MOUNT_TCP \
2177 | NFS_MOUNT_VER3 \
2178 | NFS_MOUNT_KERBEROS \
2179 | NFS_MOUNT_NONLM \
2180 | NFS_MOUNT_BROKEN_SUID \
2181 | NFS_MOUNT_STRICTLOCK \
2182 | NFS_MOUNT_LEGACY_INTERFACE)
2183
2184 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2185 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2186
2187 static int
2188 nfs_compare_remount_data(struct nfs_server *nfss,
2189 struct nfs_parsed_mount_data *data)
2190 {
2191 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2192 data->rsize != nfss->rsize ||
2193 data->wsize != nfss->wsize ||
2194 data->version != nfss->nfs_client->rpc_ops->version ||
2195 data->minorversion != nfss->nfs_client->cl_minorversion ||
2196 data->retrans != nfss->client->cl_timeout->to_retries ||
2197 data->selected_flavor != nfss->client->cl_auth->au_flavor ||
2198 data->acregmin != nfss->acregmin / HZ ||
2199 data->acregmax != nfss->acregmax / HZ ||
2200 data->acdirmin != nfss->acdirmin / HZ ||
2201 data->acdirmax != nfss->acdirmax / HZ ||
2202 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2203 data->nfs_server.port != nfss->port ||
2204 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2205 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2206 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2207 return -EINVAL;
2208
2209 return 0;
2210 }
2211
2212 int
2213 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2214 {
2215 int error;
2216 struct nfs_server *nfss = sb->s_fs_info;
2217 struct nfs_parsed_mount_data *data;
2218 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2219 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2220 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2221
2222 sync_filesystem(sb);
2223
2224 /*
2225 * Userspace mount programs that send binary options generally send
2226 * them populated with default values. We have no way to know which
2227 * ones were explicitly specified. Fall back to legacy behavior and
2228 * just return success.
2229 */
2230 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2231 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2232 options->version <= 6))))
2233 return 0;
2234
2235 data = kzalloc(sizeof(*data), GFP_KERNEL);
2236 if (data == NULL)
2237 return -ENOMEM;
2238
2239 /* fill out struct with values from existing mount */
2240 data->flags = nfss->flags;
2241 data->rsize = nfss->rsize;
2242 data->wsize = nfss->wsize;
2243 data->retrans = nfss->client->cl_timeout->to_retries;
2244 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2245 data->auth_info = nfss->auth_info;
2246 data->acregmin = nfss->acregmin / HZ;
2247 data->acregmax = nfss->acregmax / HZ;
2248 data->acdirmin = nfss->acdirmin / HZ;
2249 data->acdirmax = nfss->acdirmax / HZ;
2250 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2251 data->nfs_server.port = nfss->port;
2252 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2253 data->version = nfsvers;
2254 data->minorversion = nfss->nfs_client->cl_minorversion;
2255 data->net = current->nsproxy->net_ns;
2256 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2257 data->nfs_server.addrlen);
2258
2259 /* overwrite those values with any that were specified */
2260 error = -EINVAL;
2261 if (!nfs_parse_mount_options((char *)options, data))
2262 goto out;
2263
2264 /*
2265 * noac is a special case. It implies -o sync, but that's not
2266 * necessarily reflected in the mtab options. do_remount_sb
2267 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2268 * remount options, so we have to explicitly reset it.
2269 */
2270 if (data->flags & NFS_MOUNT_NOAC)
2271 *flags |= MS_SYNCHRONOUS;
2272
2273 /* compare new mount options with old ones */
2274 error = nfs_compare_remount_data(nfss, data);
2275 out:
2276 kfree(data);
2277 return error;
2278 }
2279 EXPORT_SYMBOL_GPL(nfs_remount);
2280
2281 /*
2282 * Initialise the common bits of the superblock
2283 */
2284 inline void nfs_initialise_sb(struct super_block *sb)
2285 {
2286 struct nfs_server *server = NFS_SB(sb);
2287
2288 sb->s_magic = NFS_SUPER_MAGIC;
2289
2290 /* We probably want something more informative here */
2291 snprintf(sb->s_id, sizeof(sb->s_id),
2292 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2293
2294 if (sb->s_blocksize == 0)
2295 sb->s_blocksize = nfs_block_bits(server->wsize,
2296 &sb->s_blocksize_bits);
2297
2298 sb->s_bdi = &server->backing_dev_info;
2299
2300 nfs_super_set_maxbytes(sb, server->maxfilesize);
2301 }
2302
2303 /*
2304 * Finish setting up an NFS2/3 superblock
2305 */
2306 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2307 {
2308 struct nfs_parsed_mount_data *data = mount_info->parsed;
2309 struct nfs_server *server = NFS_SB(sb);
2310
2311 sb->s_blocksize_bits = 0;
2312 sb->s_blocksize = 0;
2313 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2314 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2315 if (data && data->bsize)
2316 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2317
2318 if (server->nfs_client->rpc_ops->version != 2) {
2319 /* The VFS shouldn't apply the umask to mode bits. We will do
2320 * so ourselves when necessary.
2321 */
2322 sb->s_flags |= MS_POSIXACL;
2323 sb->s_time_gran = 1;
2324 }
2325
2326 nfs_initialise_sb(sb);
2327 }
2328 EXPORT_SYMBOL_GPL(nfs_fill_super);
2329
2330 /*
2331 * Finish setting up a cloned NFS2/3/4 superblock
2332 */
2333 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2334 {
2335 const struct super_block *old_sb = mount_info->cloned->sb;
2336 struct nfs_server *server = NFS_SB(sb);
2337
2338 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2339 sb->s_blocksize = old_sb->s_blocksize;
2340 sb->s_maxbytes = old_sb->s_maxbytes;
2341 sb->s_xattr = old_sb->s_xattr;
2342 sb->s_op = old_sb->s_op;
2343 sb->s_time_gran = 1;
2344
2345 if (server->nfs_client->rpc_ops->version != 2) {
2346 /* The VFS shouldn't apply the umask to mode bits. We will do
2347 * so ourselves when necessary.
2348 */
2349 sb->s_flags |= MS_POSIXACL;
2350 }
2351
2352 nfs_initialise_sb(sb);
2353 }
2354
2355 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2356 {
2357 const struct nfs_server *a = s->s_fs_info;
2358 const struct rpc_clnt *clnt_a = a->client;
2359 const struct rpc_clnt *clnt_b = b->client;
2360
2361 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2362 goto Ebusy;
2363 if (a->nfs_client != b->nfs_client)
2364 goto Ebusy;
2365 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2366 goto Ebusy;
2367 if (a->wsize != b->wsize)
2368 goto Ebusy;
2369 if (a->rsize != b->rsize)
2370 goto Ebusy;
2371 if (a->acregmin != b->acregmin)
2372 goto Ebusy;
2373 if (a->acregmax != b->acregmax)
2374 goto Ebusy;
2375 if (a->acdirmin != b->acdirmin)
2376 goto Ebusy;
2377 if (a->acdirmax != b->acdirmax)
2378 goto Ebusy;
2379 if (b->auth_info.flavor_len > 0 &&
2380 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2381 goto Ebusy;
2382 return 1;
2383 Ebusy:
2384 return 0;
2385 }
2386
2387 struct nfs_sb_mountdata {
2388 struct nfs_server *server;
2389 int mntflags;
2390 };
2391
2392 static int nfs_set_super(struct super_block *s, void *data)
2393 {
2394 struct nfs_sb_mountdata *sb_mntdata = data;
2395 struct nfs_server *server = sb_mntdata->server;
2396 int ret;
2397
2398 s->s_flags = sb_mntdata->mntflags;
2399 s->s_fs_info = server;
2400 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2401 ret = set_anon_super(s, server);
2402 if (ret == 0)
2403 server->s_dev = s->s_dev;
2404 return ret;
2405 }
2406
2407 static int nfs_compare_super_address(struct nfs_server *server1,
2408 struct nfs_server *server2)
2409 {
2410 struct sockaddr *sap1, *sap2;
2411
2412 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2413 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2414
2415 if (sap1->sa_family != sap2->sa_family)
2416 return 0;
2417
2418 switch (sap1->sa_family) {
2419 case AF_INET: {
2420 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2421 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2422 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2423 return 0;
2424 if (sin1->sin_port != sin2->sin_port)
2425 return 0;
2426 break;
2427 }
2428 case AF_INET6: {
2429 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2430 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2431 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2432 return 0;
2433 if (sin1->sin6_port != sin2->sin6_port)
2434 return 0;
2435 break;
2436 }
2437 default:
2438 return 0;
2439 }
2440
2441 return 1;
2442 }
2443
2444 static int nfs_compare_super(struct super_block *sb, void *data)
2445 {
2446 struct nfs_sb_mountdata *sb_mntdata = data;
2447 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2448 int mntflags = sb_mntdata->mntflags;
2449
2450 if (!nfs_compare_super_address(old, server))
2451 return 0;
2452 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2453 if (old->flags & NFS_MOUNT_UNSHARED)
2454 return 0;
2455 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2456 return 0;
2457 return nfs_compare_mount_options(sb, server, mntflags);
2458 }
2459
2460 #ifdef CONFIG_NFS_FSCACHE
2461 static void nfs_get_cache_cookie(struct super_block *sb,
2462 struct nfs_parsed_mount_data *parsed,
2463 struct nfs_clone_mount *cloned)
2464 {
2465 struct nfs_server *nfss = NFS_SB(sb);
2466 char *uniq = NULL;
2467 int ulen = 0;
2468
2469 nfss->fscache_key = NULL;
2470 nfss->fscache = NULL;
2471
2472 if (parsed) {
2473 if (!(parsed->options & NFS_OPTION_FSCACHE))
2474 return;
2475 if (parsed->fscache_uniq) {
2476 uniq = parsed->fscache_uniq;
2477 ulen = strlen(parsed->fscache_uniq);
2478 }
2479 } else if (cloned) {
2480 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2481 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2482 return;
2483 if (mnt_s->fscache_key) {
2484 uniq = mnt_s->fscache_key->key.uniquifier;
2485 ulen = mnt_s->fscache_key->key.uniq_len;
2486 };
2487 } else
2488 return;
2489
2490 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2491 }
2492 #else
2493 static void nfs_get_cache_cookie(struct super_block *sb,
2494 struct nfs_parsed_mount_data *parsed,
2495 struct nfs_clone_mount *cloned)
2496 {
2497 }
2498 #endif
2499
2500 static int nfs_bdi_register(struct nfs_server *server)
2501 {
2502 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2503 }
2504
2505 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2506 struct nfs_mount_info *mount_info)
2507 {
2508 int error;
2509 unsigned long kflags = 0, kflags_out = 0;
2510 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2511 kflags |= SECURITY_LSM_NATIVE_LABELS;
2512
2513 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2514 kflags, &kflags_out);
2515 if (error)
2516 goto err;
2517
2518 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2519 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2520 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2521 err:
2522 return error;
2523 }
2524 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2525
2526 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2527 struct nfs_mount_info *mount_info)
2528 {
2529 /* clone any lsm security options from the parent to the new sb */
2530 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2531 return -ESTALE;
2532 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2533 }
2534 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2535
2536 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2537 int flags, const char *dev_name,
2538 struct nfs_mount_info *mount_info,
2539 struct nfs_subversion *nfs_mod)
2540 {
2541 struct super_block *s;
2542 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2543 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2544 struct nfs_sb_mountdata sb_mntdata = {
2545 .mntflags = flags,
2546 .server = server,
2547 };
2548 int error;
2549
2550 if (server->flags & NFS_MOUNT_UNSHARED)
2551 compare_super = NULL;
2552
2553 /* -o noac implies -o sync */
2554 if (server->flags & NFS_MOUNT_NOAC)
2555 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2556
2557 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2558 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2559 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2560
2561 /* Get a superblock - note that we may end up sharing one that already exists */
2562 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2563 if (IS_ERR(s)) {
2564 mntroot = ERR_CAST(s);
2565 goto out_err_nosb;
2566 }
2567
2568 if (s->s_fs_info != server) {
2569 nfs_free_server(server);
2570 server = NULL;
2571 } else {
2572 error = nfs_bdi_register(server);
2573 if (error) {
2574 mntroot = ERR_PTR(error);
2575 goto error_splat_bdi;
2576 }
2577 server->super = s;
2578 }
2579
2580 if (!s->s_root) {
2581 /* initial superblock/root creation */
2582 mount_info->fill_super(s, mount_info);
2583 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2584 }
2585
2586 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2587 if (IS_ERR(mntroot))
2588 goto error_splat_super;
2589
2590 error = mount_info->set_security(s, mntroot, mount_info);
2591 if (error)
2592 goto error_splat_root;
2593
2594 s->s_flags |= MS_ACTIVE;
2595
2596 out:
2597 return mntroot;
2598
2599 out_err_nosb:
2600 nfs_free_server(server);
2601 goto out;
2602
2603 error_splat_root:
2604 dput(mntroot);
2605 mntroot = ERR_PTR(error);
2606 error_splat_super:
2607 if (server && !s->s_root)
2608 bdi_unregister(&server->backing_dev_info);
2609 error_splat_bdi:
2610 deactivate_locked_super(s);
2611 goto out;
2612 }
2613 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2614
2615 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2616 int flags, const char *dev_name, void *raw_data)
2617 {
2618 struct nfs_mount_info mount_info = {
2619 .fill_super = nfs_fill_super,
2620 .set_security = nfs_set_sb_security,
2621 };
2622 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2623 struct nfs_subversion *nfs_mod;
2624 int error;
2625
2626 mount_info.parsed = nfs_alloc_parsed_mount_data();
2627 mount_info.mntfh = nfs_alloc_fhandle();
2628 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2629 goto out;
2630
2631 /* Validate the mount data */
2632 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2633 if (error == NFS_TEXT_DATA)
2634 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2635 if (error < 0) {
2636 mntroot = ERR_PTR(error);
2637 goto out;
2638 }
2639
2640 nfs_mod = get_nfs_version(mount_info.parsed->version);
2641 if (IS_ERR(nfs_mod)) {
2642 mntroot = ERR_CAST(nfs_mod);
2643 goto out;
2644 }
2645
2646 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2647
2648 put_nfs_version(nfs_mod);
2649 out:
2650 nfs_free_parsed_mount_data(mount_info.parsed);
2651 nfs_free_fhandle(mount_info.mntfh);
2652 return mntroot;
2653 }
2654 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2655
2656 /*
2657 * Ensure that we unregister the bdi before kill_anon_super
2658 * releases the device name
2659 */
2660 void nfs_put_super(struct super_block *s)
2661 {
2662 struct nfs_server *server = NFS_SB(s);
2663
2664 bdi_unregister(&server->backing_dev_info);
2665 }
2666 EXPORT_SYMBOL_GPL(nfs_put_super);
2667
2668 /*
2669 * Destroy an NFS2/3 superblock
2670 */
2671 void nfs_kill_super(struct super_block *s)
2672 {
2673 struct nfs_server *server = NFS_SB(s);
2674
2675 kill_anon_super(s);
2676 nfs_fscache_release_super_cookie(s);
2677 nfs_free_server(server);
2678 }
2679 EXPORT_SYMBOL_GPL(nfs_kill_super);
2680
2681 /*
2682 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2683 */
2684 static struct dentry *
2685 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2686 const char *dev_name, void *raw_data)
2687 {
2688 struct nfs_clone_mount *data = raw_data;
2689 struct nfs_mount_info mount_info = {
2690 .fill_super = nfs_clone_super,
2691 .set_security = nfs_clone_sb_security,
2692 .cloned = data,
2693 };
2694 struct nfs_server *server;
2695 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2696 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2697
2698 dprintk("--> nfs_xdev_mount()\n");
2699
2700 mount_info.mntfh = mount_info.cloned->fh;
2701
2702 /* create a new volume representation */
2703 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2704
2705 if (IS_ERR(server))
2706 mntroot = ERR_CAST(server);
2707 else
2708 mntroot = nfs_fs_mount_common(server, flags,
2709 dev_name, &mount_info, nfs_mod);
2710
2711 dprintk("<-- nfs_xdev_mount() = %ld\n",
2712 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2713 return mntroot;
2714 }
2715
2716 #if IS_ENABLED(CONFIG_NFS_V4)
2717
2718 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2719 {
2720 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2721 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2722 }
2723
2724 /*
2725 * Validate NFSv4 mount options
2726 */
2727 static int nfs4_validate_mount_data(void *options,
2728 struct nfs_parsed_mount_data *args,
2729 const char *dev_name)
2730 {
2731 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2732 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2733 char *c;
2734
2735 if (data == NULL)
2736 goto out_no_data;
2737
2738 args->version = 4;
2739
2740 switch (data->version) {
2741 case 1:
2742 if (data->host_addrlen > sizeof(args->nfs_server.address))
2743 goto out_no_address;
2744 if (data->host_addrlen == 0)
2745 goto out_no_address;
2746 args->nfs_server.addrlen = data->host_addrlen;
2747 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2748 return -EFAULT;
2749 if (!nfs_verify_server_address(sap))
2750 goto out_no_address;
2751 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2752
2753 if (data->auth_flavourlen) {
2754 rpc_authflavor_t pseudoflavor;
2755 if (data->auth_flavourlen > 1)
2756 goto out_inval_auth;
2757 if (copy_from_user(&pseudoflavor,
2758 data->auth_flavours,
2759 sizeof(pseudoflavor)))
2760 return -EFAULT;
2761 args->selected_flavor = pseudoflavor;
2762 } else
2763 args->selected_flavor = RPC_AUTH_UNIX;
2764
2765 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2766 if (IS_ERR(c))
2767 return PTR_ERR(c);
2768 args->nfs_server.hostname = c;
2769
2770 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2771 if (IS_ERR(c))
2772 return PTR_ERR(c);
2773 args->nfs_server.export_path = c;
2774 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2775
2776 c = strndup_user(data->client_addr.data, 16);
2777 if (IS_ERR(c))
2778 return PTR_ERR(c);
2779 args->client_address = c;
2780
2781 /*
2782 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2783 * can deal with.
2784 */
2785
2786 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2787 args->rsize = data->rsize;
2788 args->wsize = data->wsize;
2789 args->timeo = data->timeo;
2790 args->retrans = data->retrans;
2791 args->acregmin = data->acregmin;
2792 args->acregmax = data->acregmax;
2793 args->acdirmin = data->acdirmin;
2794 args->acdirmax = data->acdirmax;
2795 args->nfs_server.protocol = data->proto;
2796 nfs_validate_transport_protocol(args);
2797 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2798 goto out_invalid_transport_udp;
2799
2800 break;
2801 default:
2802 return NFS_TEXT_DATA;
2803 }
2804
2805 return 0;
2806
2807 out_no_data:
2808 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2809 return -EINVAL;
2810
2811 out_inval_auth:
2812 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2813 data->auth_flavourlen);
2814 return -EINVAL;
2815
2816 out_no_address:
2817 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2818 return -EINVAL;
2819
2820 out_invalid_transport_udp:
2821 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2822 return -EINVAL;
2823 }
2824
2825 /*
2826 * NFS v4 module parameters need to stay in the
2827 * NFS client for backwards compatibility
2828 */
2829 unsigned int nfs_callback_set_tcpport;
2830 unsigned short nfs_callback_tcpport;
2831 /* Default cache timeout is 10 minutes */
2832 unsigned int nfs_idmap_cache_timeout = 600;
2833 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2834 bool nfs4_disable_idmapping = true;
2835 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2836 unsigned short send_implementation_id = 1;
2837 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2838 bool recover_lost_locks = false;
2839
2840 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2841 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2842 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2843 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2844 EXPORT_SYMBOL_GPL(max_session_slots);
2845 EXPORT_SYMBOL_GPL(send_implementation_id);
2846 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2847 EXPORT_SYMBOL_GPL(recover_lost_locks);
2848
2849 #define NFS_CALLBACK_MAXPORTNR (65535U)
2850
2851 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2852 {
2853 unsigned long num;
2854 int ret;
2855
2856 if (!val)
2857 return -EINVAL;
2858 ret = kstrtoul(val, 0, &num);
2859 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2860 return -EINVAL;
2861 *((unsigned int *)kp->arg) = num;
2862 return 0;
2863 }
2864 static struct kernel_param_ops param_ops_portnr = {
2865 .set = param_set_portnr,
2866 .get = param_get_uint,
2867 };
2868 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2869
2870 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2871 module_param(nfs_idmap_cache_timeout, int, 0644);
2872 module_param(nfs4_disable_idmapping, bool, 0644);
2873 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2874 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2875 MODULE_PARM_DESC(nfs4_disable_idmapping,
2876 "Turn off NFSv4 idmapping when using 'sec=sys'");
2877 module_param(max_session_slots, ushort, 0644);
2878 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2879 "requests the client will negotiate");
2880 module_param(send_implementation_id, ushort, 0644);
2881 MODULE_PARM_DESC(send_implementation_id,
2882 "Send implementation ID with NFSv4.1 exchange_id");
2883 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2884
2885 module_param(recover_lost_locks, bool, 0644);
2886 MODULE_PARM_DESC(recover_lost_locks,
2887 "If the server reports that a lock might be lost, "
2888 "try to recover it risking data corruption.");
2889
2890
2891 #endif /* CONFIG_NFS_V4 */
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