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Linux 4.19.133
[linux/fpc-iii.git] / fs / nfs / super.c
blob5db7aceb41907293f428456b0626d3fa9df04c00
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/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57
58 #include <linux/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "nfs4session.h"
67 #include "pnfs.h"
68 #include "nfs.h"
69
70 #define NFSDBG_FACILITY NFSDBG_VFS
71 #define NFS_TEXT_DATA 1
72
73 #if IS_ENABLED(CONFIG_NFS_V3)
74 #define NFS_DEFAULT_VERSION 3
75 #else
76 #define NFS_DEFAULT_VERSION 2
77 #endif
78
79 enum {
80 /* Mount options that take no arguments */
81 Opt_soft, Opt_hard,
82 Opt_posix, Opt_noposix,
83 Opt_cto, Opt_nocto,
84 Opt_ac, Opt_noac,
85 Opt_lock, Opt_nolock,
86 Opt_udp, Opt_tcp, Opt_rdma,
87 Opt_acl, Opt_noacl,
88 Opt_rdirplus, Opt_nordirplus,
89 Opt_sharecache, Opt_nosharecache,
90 Opt_resvport, Opt_noresvport,
91 Opt_fscache, Opt_nofscache,
92 Opt_migration, Opt_nomigration,
93
94 /* Mount options that take integer arguments */
95 Opt_port,
96 Opt_rsize, Opt_wsize, Opt_bsize,
97 Opt_timeo, Opt_retrans,
98 Opt_acregmin, Opt_acregmax,
99 Opt_acdirmin, Opt_acdirmax,
100 Opt_actimeo,
101 Opt_namelen,
102 Opt_mountport,
103 Opt_mountvers,
104 Opt_minorversion,
105
106 /* Mount options that take string arguments */
107 Opt_nfsvers,
108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
109 Opt_addr, Opt_mountaddr, Opt_clientaddr,
110 Opt_lookupcache,
111 Opt_fscache_uniq,
112 Opt_local_lock,
113
114 /* Special mount options */
115 Opt_userspace, Opt_deprecated, Opt_sloppy,
116
117 Opt_err
118 };
119
120 static const match_table_t nfs_mount_option_tokens = {
121 { Opt_userspace, "bg" },
122 { Opt_userspace, "fg" },
123 { Opt_userspace, "retry=%s" },
124
125 { Opt_sloppy, "sloppy" },
126
127 { Opt_soft, "soft" },
128 { Opt_hard, "hard" },
129 { Opt_deprecated, "intr" },
130 { Opt_deprecated, "nointr" },
131 { Opt_posix, "posix" },
132 { Opt_noposix, "noposix" },
133 { Opt_cto, "cto" },
134 { Opt_nocto, "nocto" },
135 { Opt_ac, "ac" },
136 { Opt_noac, "noac" },
137 { Opt_lock, "lock" },
138 { Opt_nolock, "nolock" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152 { Opt_migration, "migration" },
153 { Opt_nomigration, "nomigration" },
154
155 { Opt_port, "port=%s" },
156 { Opt_rsize, "rsize=%s" },
157 { Opt_wsize, "wsize=%s" },
158 { Opt_bsize, "bsize=%s" },
159 { Opt_timeo, "timeo=%s" },
160 { Opt_retrans, "retrans=%s" },
161 { Opt_acregmin, "acregmin=%s" },
162 { Opt_acregmax, "acregmax=%s" },
163 { Opt_acdirmin, "acdirmin=%s" },
164 { Opt_acdirmax, "acdirmax=%s" },
165 { Opt_actimeo, "actimeo=%s" },
166 { Opt_namelen, "namlen=%s" },
167 { Opt_mountport, "mountport=%s" },
168 { Opt_mountvers, "mountvers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_nfsvers, "nfsvers=%s" },
172 { Opt_nfsvers, "vers=%s" },
173
174 { Opt_sec, "sec=%s" },
175 { Opt_proto, "proto=%s" },
176 { Opt_mountproto, "mountproto=%s" },
177 { Opt_addr, "addr=%s" },
178 { Opt_clientaddr, "clientaddr=%s" },
179 { Opt_mounthost, "mounthost=%s" },
180 { Opt_mountaddr, "mountaddr=%s" },
181
182 { Opt_lookupcache, "lookupcache=%s" },
183 { Opt_fscache_uniq, "fsc=%s" },
184 { Opt_local_lock, "local_lock=%s" },
185
186 /* The following needs to be listed after all other options */
187 { Opt_nfsvers, "v%s" },
188
189 { Opt_err, NULL }
190 };
191
192 enum {
193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
194 Opt_xprt_rdma6,
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 { Opt_xprt_rdma6, "rdma6" },
206
207 { Opt_xprt_err, NULL }
208 };
209
210 enum {
211 Opt_sec_none, Opt_sec_sys,
212 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
213 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
214 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
215
216 Opt_sec_err
217 };
218
219 static const match_table_t nfs_secflavor_tokens = {
220 { Opt_sec_none, "none" },
221 { Opt_sec_none, "null" },
222 { Opt_sec_sys, "sys" },
223
224 { Opt_sec_krb5, "krb5" },
225 { Opt_sec_krb5i, "krb5i" },
226 { Opt_sec_krb5p, "krb5p" },
227
228 { Opt_sec_lkey, "lkey" },
229 { Opt_sec_lkeyi, "lkeyi" },
230 { Opt_sec_lkeyp, "lkeyp" },
231
232 { Opt_sec_spkm, "spkm3" },
233 { Opt_sec_spkmi, "spkm3i" },
234 { Opt_sec_spkmp, "spkm3p" },
235
236 { Opt_sec_err, NULL }
237 };
238
239 enum {
240 Opt_lookupcache_all, Opt_lookupcache_positive,
241 Opt_lookupcache_none,
242
243 Opt_lookupcache_err
244 };
245
246 static match_table_t nfs_lookupcache_tokens = {
247 { Opt_lookupcache_all, "all" },
248 { Opt_lookupcache_positive, "pos" },
249 { Opt_lookupcache_positive, "positive" },
250 { Opt_lookupcache_none, "none" },
251
252 { Opt_lookupcache_err, NULL }
253 };
254
255 enum {
256 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
257 Opt_local_lock_none,
258
259 Opt_local_lock_err
260 };
261
262 static match_table_t nfs_local_lock_tokens = {
263 { Opt_local_lock_all, "all" },
264 { Opt_local_lock_flock, "flock" },
265 { Opt_local_lock_posix, "posix" },
266 { Opt_local_lock_none, "none" },
267
268 { Opt_local_lock_err, NULL }
269 };
270
271 enum {
272 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
273 Opt_vers_4_1, Opt_vers_4_2,
274
275 Opt_vers_err
276 };
277
278 static match_table_t nfs_vers_tokens = {
279 { Opt_vers_2, "2" },
280 { Opt_vers_3, "3" },
281 { Opt_vers_4, "4" },
282 { Opt_vers_4_0, "4.0" },
283 { Opt_vers_4_1, "4.1" },
284 { Opt_vers_4_2, "4.2" },
285
286 { Opt_vers_err, NULL }
287 };
288
289 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
290 int flags, const char *dev_name, void *raw_data);
291
292 struct file_system_type nfs_fs_type = {
293 .owner = THIS_MODULE,
294 .name = "nfs",
295 .mount = nfs_fs_mount,
296 .kill_sb = nfs_kill_super,
297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
298 };
299 MODULE_ALIAS_FS("nfs");
300 EXPORT_SYMBOL_GPL(nfs_fs_type);
301
302 struct file_system_type nfs_xdev_fs_type = {
303 .owner = THIS_MODULE,
304 .name = "nfs",
305 .mount = nfs_xdev_mount,
306 .kill_sb = nfs_kill_super,
307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
308 };
309
310 const struct super_operations nfs_sops = {
311 .alloc_inode = nfs_alloc_inode,
312 .destroy_inode = nfs_destroy_inode,
313 .write_inode = nfs_write_inode,
314 .drop_inode = nfs_drop_inode,
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 ret = register_shrinker(&acl_shrinker);
387 if (ret < 0)
388 goto error_3;
389 return 0;
390 error_3:
391 nfs_unregister_sysctl();
392 error_2:
393 unregister_nfs4_fs();
394 error_1:
395 unregister_filesystem(&nfs_fs_type);
396 error_0:
397 return ret;
398 }
399
400 /*
401 * Unregister the NFS filesystems
402 */
403 void __exit unregister_nfs_fs(void)
404 {
405 unregister_shrinker(&acl_shrinker);
406 nfs_unregister_sysctl();
407 unregister_nfs4_fs();
408 unregister_filesystem(&nfs_fs_type);
409 }
410
411 bool nfs_sb_active(struct super_block *sb)
412 {
413 struct nfs_server *server = NFS_SB(sb);
414
415 if (!atomic_inc_not_zero(&sb->s_active))
416 return false;
417 if (atomic_inc_return(&server->active) != 1)
418 atomic_dec(&sb->s_active);
419 return true;
420 }
421 EXPORT_SYMBOL_GPL(nfs_sb_active);
422
423 void nfs_sb_deactive(struct super_block *sb)
424 {
425 struct nfs_server *server = NFS_SB(sb);
426
427 if (atomic_dec_and_test(&server->active))
428 deactivate_super(sb);
429 }
430 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
431
432 /*
433 * Deliver file system statistics to userspace
434 */
435 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
436 {
437 struct nfs_server *server = NFS_SB(dentry->d_sb);
438 unsigned char blockbits;
439 unsigned long blockres;
440 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
441 struct nfs_fsstat res;
442 int error = -ENOMEM;
443
444 res.fattr = nfs_alloc_fattr();
445 if (res.fattr == NULL)
446 goto out_err;
447
448 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
449 if (unlikely(error == -ESTALE)) {
450 struct dentry *pd_dentry;
451
452 pd_dentry = dget_parent(dentry);
453 if (pd_dentry != NULL) {
454 nfs_zap_caches(d_inode(pd_dentry));
455 dput(pd_dentry);
456 }
457 }
458 nfs_free_fattr(res.fattr);
459 if (error < 0)
460 goto out_err;
461
462 buf->f_type = NFS_SUPER_MAGIC;
463
464 /*
465 * Current versions of glibc do not correctly handle the
466 * case where f_frsize != f_bsize. Eventually we want to
467 * report the value of wtmult in this field.
468 */
469 buf->f_frsize = dentry->d_sb->s_blocksize;
470
471 /*
472 * On most *nix systems, f_blocks, f_bfree, and f_bavail
473 * are reported in units of f_frsize. Linux hasn't had
474 * an f_frsize field in its statfs struct until recently,
475 * thus historically Linux's sys_statfs reports these
476 * fields in units of f_bsize.
477 */
478 buf->f_bsize = dentry->d_sb->s_blocksize;
479 blockbits = dentry->d_sb->s_blocksize_bits;
480 blockres = (1 << blockbits) - 1;
481 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
482 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
483 buf->f_bavail = (res.abytes + blockres) >> blockbits;
484
485 buf->f_files = res.tfiles;
486 buf->f_ffree = res.afiles;
487
488 buf->f_namelen = server->namelen;
489
490 return 0;
491
492 out_err:
493 dprintk("%s: statfs error = %d\n", __func__, -error);
494 return error;
495 }
496 EXPORT_SYMBOL_GPL(nfs_statfs);
497
498 /*
499 * Map the security flavour number to a name
500 */
501 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
502 {
503 static const struct {
504 rpc_authflavor_t flavour;
505 const char *str;
506 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
507 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
508 { RPC_AUTH_NULL, "null" },
509 { RPC_AUTH_UNIX, "sys" },
510 { RPC_AUTH_GSS_KRB5, "krb5" },
511 { RPC_AUTH_GSS_KRB5I, "krb5i" },
512 { RPC_AUTH_GSS_KRB5P, "krb5p" },
513 { RPC_AUTH_GSS_LKEY, "lkey" },
514 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
515 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
516 { RPC_AUTH_GSS_SPKM, "spkm" },
517 { RPC_AUTH_GSS_SPKMI, "spkmi" },
518 { RPC_AUTH_GSS_SPKMP, "spkmp" },
519 { UINT_MAX, "unknown" }
520 };
521 int i;
522
523 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
524 if (sec_flavours[i].flavour == flavour)
525 break;
526 }
527 return sec_flavours[i].str;
528 }
529
530 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
531 int showdefaults)
532 {
533 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
534 char *proto = NULL;
535
536 switch (sap->sa_family) {
537 case AF_INET:
538 switch (nfss->mountd_protocol) {
539 case IPPROTO_UDP:
540 proto = RPCBIND_NETID_UDP;
541 break;
542 case IPPROTO_TCP:
543 proto = RPCBIND_NETID_TCP;
544 break;
545 }
546 break;
547 case AF_INET6:
548 switch (nfss->mountd_protocol) {
549 case IPPROTO_UDP:
550 proto = RPCBIND_NETID_UDP6;
551 break;
552 case IPPROTO_TCP:
553 proto = RPCBIND_NETID_TCP6;
554 break;
555 }
556 break;
557 }
558 if (proto || showdefaults)
559 seq_printf(m, ",mountproto=%s", proto ?: "auto");
560 }
561
562 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
563 int showdefaults)
564 {
565 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
566
567 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
568 return;
569
570 switch (sap->sa_family) {
571 case AF_INET: {
572 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
573 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
574 break;
575 }
576 case AF_INET6: {
577 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
578 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
579 break;
580 }
581 default:
582 if (showdefaults)
583 seq_printf(m, ",mountaddr=unspecified");
584 }
585
586 if (nfss->mountd_version || showdefaults)
587 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
588 if ((nfss->mountd_port &&
589 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
590 showdefaults)
591 seq_printf(m, ",mountport=%u", nfss->mountd_port);
592
593 nfs_show_mountd_netid(m, nfss, showdefaults);
594 }
595
596 #if IS_ENABLED(CONFIG_NFS_V4)
597 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
598 int showdefaults)
599 {
600 struct nfs_client *clp = nfss->nfs_client;
601
602 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
603 }
604 #else
605 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
606 int showdefaults)
607 {
608 }
609 #endif
610
611 static void nfs_show_nfs_version(struct seq_file *m,
612 unsigned int version,
613 unsigned int minorversion)
614 {
615 seq_printf(m, ",vers=%u", version);
616 if (version == 4)
617 seq_printf(m, ".%u", minorversion);
618 }
619
620 /*
621 * Describe the mount options in force on this server representation
622 */
623 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
624 int showdefaults)
625 {
626 static const struct proc_nfs_info {
627 int flag;
628 const char *str;
629 const char *nostr;
630 } nfs_info[] = {
631 { NFS_MOUNT_SOFT, ",soft", ",hard" },
632 { NFS_MOUNT_POSIX, ",posix", "" },
633 { NFS_MOUNT_NOCTO, ",nocto", "" },
634 { NFS_MOUNT_NOAC, ",noac", "" },
635 { NFS_MOUNT_NONLM, ",nolock", "" },
636 { NFS_MOUNT_NOACL, ",noacl", "" },
637 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
638 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
639 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
640 { 0, NULL, NULL }
641 };
642 const struct proc_nfs_info *nfs_infop;
643 struct nfs_client *clp = nfss->nfs_client;
644 u32 version = clp->rpc_ops->version;
645 int local_flock, local_fcntl;
646
647 nfs_show_nfs_version(m, version, clp->cl_minorversion);
648 seq_printf(m, ",rsize=%u", nfss->rsize);
649 seq_printf(m, ",wsize=%u", nfss->wsize);
650 if (nfss->bsize != 0)
651 seq_printf(m, ",bsize=%u", nfss->bsize);
652 seq_printf(m, ",namlen=%u", nfss->namelen);
653 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
654 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
655 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
656 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
657 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
658 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
659 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
660 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
661 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
662 if (nfss->flags & nfs_infop->flag)
663 seq_puts(m, nfs_infop->str);
664 else
665 seq_puts(m, nfs_infop->nostr);
666 }
667 rcu_read_lock();
668 seq_printf(m, ",proto=%s",
669 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
670 rcu_read_unlock();
671 if (version == 4) {
672 if (nfss->port != NFS_PORT)
673 seq_printf(m, ",port=%u", nfss->port);
674 } else
675 if (nfss->port)
676 seq_printf(m, ",port=%u", nfss->port);
677
678 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
679 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
680 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
681
682 if (version != 4)
683 nfs_show_mountd_options(m, nfss, showdefaults);
684 else
685 nfs_show_nfsv4_options(m, nfss, showdefaults);
686
687 if (nfss->options & NFS_OPTION_FSCACHE)
688 seq_printf(m, ",fsc");
689
690 if (nfss->options & NFS_OPTION_MIGRATION)
691 seq_printf(m, ",migration");
692
693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
695 seq_printf(m, ",lookupcache=none");
696 else
697 seq_printf(m, ",lookupcache=pos");
698 }
699
700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
702
703 if (!local_flock && !local_fcntl)
704 seq_printf(m, ",local_lock=none");
705 else if (local_flock && local_fcntl)
706 seq_printf(m, ",local_lock=all");
707 else if (local_flock)
708 seq_printf(m, ",local_lock=flock");
709 else
710 seq_printf(m, ",local_lock=posix");
711 }
712
713 /*
714 * Describe the mount options on this VFS mountpoint
715 */
716 int nfs_show_options(struct seq_file *m, struct dentry *root)
717 {
718 struct nfs_server *nfss = NFS_SB(root->d_sb);
719
720 nfs_show_mount_options(m, nfss, 0);
721
722 rcu_read_lock();
723 seq_printf(m, ",addr=%s",
724 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
725 RPC_DISPLAY_ADDR));
726 rcu_read_unlock();
727
728 return 0;
729 }
730 EXPORT_SYMBOL_GPL(nfs_show_options);
731
732 #if IS_ENABLED(CONFIG_NFS_V4)
733 #ifdef CONFIG_NFS_V4_1
734 static void show_sessions(struct seq_file *m, struct nfs_server *server)
735 {
736 if (nfs4_has_session(server->nfs_client))
737 seq_printf(m, ",sessions");
738 }
739 #else
740 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
741 #endif
742 #endif
743
744 #ifdef CONFIG_NFS_V4_1
745 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
746 {
747 seq_printf(m, ",pnfs=");
748 if (server->pnfs_curr_ld)
749 seq_printf(m, "%s", server->pnfs_curr_ld->name);
750 else
751 seq_printf(m, "not configured");
752 }
753
754 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
755 {
756 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
757 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
758 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
759 "date='%llu,%u'",
760 impl_id->name, impl_id->domain,
761 impl_id->date.seconds, impl_id->date.nseconds);
762 }
763 }
764 #else
765 #if IS_ENABLED(CONFIG_NFS_V4)
766 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
767 {
768 }
769 #endif
770 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
771 {
772 }
773 #endif
774
775 int nfs_show_devname(struct seq_file *m, struct dentry *root)
776 {
777 char *page = (char *) __get_free_page(GFP_KERNEL);
778 char *devname, *dummy;
779 int err = 0;
780 if (!page)
781 return -ENOMEM;
782 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
783 if (IS_ERR(devname))
784 err = PTR_ERR(devname);
785 else
786 seq_escape(m, devname, " \t\n\\");
787 free_page((unsigned long)page);
788 return err;
789 }
790 EXPORT_SYMBOL_GPL(nfs_show_devname);
791
792 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
793 {
794 seq_puts(m, "/");
795 return 0;
796 }
797 EXPORT_SYMBOL_GPL(nfs_show_path);
798
799 /*
800 * Present statistical information for this VFS mountpoint
801 */
802 int nfs_show_stats(struct seq_file *m, struct dentry *root)
803 {
804 int i, cpu;
805 struct nfs_server *nfss = NFS_SB(root->d_sb);
806 struct rpc_auth *auth = nfss->client->cl_auth;
807 struct nfs_iostats totals = { };
808
809 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
810
811 /*
812 * Display all mount option settings
813 */
814 seq_printf(m, "\n\topts:\t");
815 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
816 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
817 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
818 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
819 nfs_show_mount_options(m, nfss, 1);
820
821 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
822
823 show_implementation_id(m, nfss);
824
825 seq_printf(m, "\n\tcaps:\t");
826 seq_printf(m, "caps=0x%x", nfss->caps);
827 seq_printf(m, ",wtmult=%u", nfss->wtmult);
828 seq_printf(m, ",dtsize=%u", nfss->dtsize);
829 seq_printf(m, ",bsize=%u", nfss->bsize);
830 seq_printf(m, ",namlen=%u", nfss->namelen);
831
832 #if IS_ENABLED(CONFIG_NFS_V4)
833 if (nfss->nfs_client->rpc_ops->version == 4) {
834 seq_printf(m, "\n\tnfsv4:\t");
835 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
836 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
837 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
838 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
839 show_sessions(m, nfss);
840 show_pnfs(m, nfss);
841 }
842 #endif
843
844 /*
845 * Display security flavor in effect for this mount
846 */
847 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
848 if (auth->au_flavor)
849 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
850
851 /*
852 * Display superblock I/O counters
853 */
854 for_each_possible_cpu(cpu) {
855 struct nfs_iostats *stats;
856
857 preempt_disable();
858 stats = per_cpu_ptr(nfss->io_stats, cpu);
859
860 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
861 totals.events[i] += stats->events[i];
862 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
863 totals.bytes[i] += stats->bytes[i];
864 #ifdef CONFIG_NFS_FSCACHE
865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866 totals.fscache[i] += stats->fscache[i];
867 #endif
868
869 preempt_enable();
870 }
871
872 seq_printf(m, "\n\tevents:\t");
873 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
874 seq_printf(m, "%lu ", totals.events[i]);
875 seq_printf(m, "\n\tbytes:\t");
876 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
877 seq_printf(m, "%Lu ", totals.bytes[i]);
878 #ifdef CONFIG_NFS_FSCACHE
879 if (nfss->options & NFS_OPTION_FSCACHE) {
880 seq_printf(m, "\n\tfsc:\t");
881 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
882 seq_printf(m, "%Lu ", totals.fscache[i]);
883 }
884 #endif
885 seq_printf(m, "\n");
886
887 rpc_clnt_show_stats(m, nfss->client);
888
889 return 0;
890 }
891 EXPORT_SYMBOL_GPL(nfs_show_stats);
892
893 /*
894 * Begin unmount by attempting to remove all automounted mountpoints we added
895 * in response to xdev traversals and referrals
896 */
897 void nfs_umount_begin(struct super_block *sb)
898 {
899 struct nfs_server *server;
900 struct rpc_clnt *rpc;
901
902 server = NFS_SB(sb);
903 /* -EIO all pending I/O */
904 rpc = server->client_acl;
905 if (!IS_ERR(rpc))
906 rpc_killall_tasks(rpc);
907 rpc = server->client;
908 if (!IS_ERR(rpc))
909 rpc_killall_tasks(rpc);
910 }
911 EXPORT_SYMBOL_GPL(nfs_umount_begin);
912
913 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
914 {
915 struct nfs_parsed_mount_data *data;
916
917 data = kzalloc(sizeof(*data), GFP_KERNEL);
918 if (data) {
919 data->timeo = NFS_UNSPEC_TIMEO;
920 data->retrans = NFS_UNSPEC_RETRANS;
921 data->acregmin = NFS_DEF_ACREGMIN;
922 data->acregmax = NFS_DEF_ACREGMAX;
923 data->acdirmin = NFS_DEF_ACDIRMIN;
924 data->acdirmax = NFS_DEF_ACDIRMAX;
925 data->mount_server.port = NFS_UNSPEC_PORT;
926 data->nfs_server.port = NFS_UNSPEC_PORT;
927 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
928 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
929 data->minorversion = 0;
930 data->need_mount = true;
931 data->net = current->nsproxy->net_ns;
932 security_init_mnt_opts(&data->lsm_opts);
933 }
934 return data;
935 }
936
937 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
938 {
939 if (data) {
940 kfree(data->client_address);
941 kfree(data->mount_server.hostname);
942 kfree(data->nfs_server.export_path);
943 kfree(data->nfs_server.hostname);
944 kfree(data->fscache_uniq);
945 security_free_mnt_opts(&data->lsm_opts);
946 kfree(data);
947 }
948 }
949
950 /*
951 * Sanity-check a server address provided by the mount command.
952 *
953 * Address family must be initialized, and address must not be
954 * the ANY address for that family.
955 */
956 static int nfs_verify_server_address(struct sockaddr *addr)
957 {
958 switch (addr->sa_family) {
959 case AF_INET: {
960 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
961 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
962 }
963 case AF_INET6: {
964 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
965 return !ipv6_addr_any(sa);
966 }
967 }
968
969 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
970 return 0;
971 }
972
973 /*
974 * Select between a default port value and a user-specified port value.
975 * If a zero value is set, then autobind will be used.
976 */
977 static void nfs_set_port(struct sockaddr *sap, int *port,
978 const unsigned short default_port)
979 {
980 if (*port == NFS_UNSPEC_PORT)
981 *port = default_port;
982
983 rpc_set_port(sap, *port);
984 }
985
986 /*
987 * Sanity check the NFS transport protocol.
988 *
989 */
990 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
991 {
992 switch (mnt->nfs_server.protocol) {
993 case XPRT_TRANSPORT_UDP:
994 case XPRT_TRANSPORT_TCP:
995 case XPRT_TRANSPORT_RDMA:
996 break;
997 default:
998 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
999 }
1000 }
1001
1002 /*
1003 * For text based NFSv2/v3 mounts, the mount protocol transport default
1004 * settings should depend upon the specified NFS transport.
1005 */
1006 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1007 {
1008 nfs_validate_transport_protocol(mnt);
1009
1010 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1011 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1012 return;
1013 switch (mnt->nfs_server.protocol) {
1014 case XPRT_TRANSPORT_UDP:
1015 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1016 break;
1017 case XPRT_TRANSPORT_TCP:
1018 case XPRT_TRANSPORT_RDMA:
1019 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1020 }
1021 }
1022
1023 /*
1024 * Add 'flavor' to 'auth_info' if not already present.
1025 * Returns true if 'flavor' ends up in the list, false otherwise
1026 */
1027 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1028 rpc_authflavor_t flavor)
1029 {
1030 unsigned int i;
1031 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1032
1033 /* make sure this flavor isn't already in the list */
1034 for (i = 0; i < auth_info->flavor_len; i++) {
1035 if (flavor == auth_info->flavors[i])
1036 return true;
1037 }
1038
1039 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1040 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1041 return false;
1042 }
1043
1044 auth_info->flavors[auth_info->flavor_len++] = flavor;
1045 return true;
1046 }
1047
1048 /*
1049 * Return true if 'match' is in auth_info or auth_info is empty.
1050 * Return false otherwise.
1051 */
1052 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1053 rpc_authflavor_t match)
1054 {
1055 int i;
1056
1057 if (!auth_info->flavor_len)
1058 return true;
1059
1060 for (i = 0; i < auth_info->flavor_len; i++) {
1061 if (auth_info->flavors[i] == match)
1062 return true;
1063 }
1064 return false;
1065 }
1066 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1067
1068 /*
1069 * Parse the value of the 'sec=' option.
1070 */
1071 static int nfs_parse_security_flavors(char *value,
1072 struct nfs_parsed_mount_data *mnt)
1073 {
1074 substring_t args[MAX_OPT_ARGS];
1075 rpc_authflavor_t pseudoflavor;
1076 char *p;
1077
1078 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1079
1080 while ((p = strsep(&value, ":")) != NULL) {
1081 switch (match_token(p, nfs_secflavor_tokens, args)) {
1082 case Opt_sec_none:
1083 pseudoflavor = RPC_AUTH_NULL;
1084 break;
1085 case Opt_sec_sys:
1086 pseudoflavor = RPC_AUTH_UNIX;
1087 break;
1088 case Opt_sec_krb5:
1089 pseudoflavor = RPC_AUTH_GSS_KRB5;
1090 break;
1091 case Opt_sec_krb5i:
1092 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1093 break;
1094 case Opt_sec_krb5p:
1095 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1096 break;
1097 case Opt_sec_lkey:
1098 pseudoflavor = RPC_AUTH_GSS_LKEY;
1099 break;
1100 case Opt_sec_lkeyi:
1101 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1102 break;
1103 case Opt_sec_lkeyp:
1104 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1105 break;
1106 case Opt_sec_spkm:
1107 pseudoflavor = RPC_AUTH_GSS_SPKM;
1108 break;
1109 case Opt_sec_spkmi:
1110 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1111 break;
1112 case Opt_sec_spkmp:
1113 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1114 break;
1115 default:
1116 dfprintk(MOUNT,
1117 "NFS: sec= option '%s' not recognized\n", p);
1118 return 0;
1119 }
1120
1121 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1122 return 0;
1123 }
1124
1125 return 1;
1126 }
1127
1128 static int nfs_parse_version_string(char *string,
1129 struct nfs_parsed_mount_data *mnt,
1130 substring_t *args)
1131 {
1132 mnt->flags &= ~NFS_MOUNT_VER3;
1133 switch (match_token(string, nfs_vers_tokens, args)) {
1134 case Opt_vers_2:
1135 mnt->version = 2;
1136 break;
1137 case Opt_vers_3:
1138 mnt->flags |= NFS_MOUNT_VER3;
1139 mnt->version = 3;
1140 break;
1141 case Opt_vers_4:
1142 /* Backward compatibility option. In future,
1143 * the mount program should always supply
1144 * a NFSv4 minor version number.
1145 */
1146 mnt->version = 4;
1147 break;
1148 case Opt_vers_4_0:
1149 mnt->version = 4;
1150 mnt->minorversion = 0;
1151 break;
1152 case Opt_vers_4_1:
1153 mnt->version = 4;
1154 mnt->minorversion = 1;
1155 break;
1156 case Opt_vers_4_2:
1157 mnt->version = 4;
1158 mnt->minorversion = 2;
1159 break;
1160 default:
1161 return 0;
1162 }
1163 return 1;
1164 }
1165
1166 static int nfs_get_option_str(substring_t args[], char **option)
1167 {
1168 kfree(*option);
1169 *option = match_strdup(args);
1170 return !*option;
1171 }
1172
1173 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1174 {
1175 int rc;
1176 char *string;
1177
1178 string = match_strdup(args);
1179 if (string == NULL)
1180 return -ENOMEM;
1181 rc = kstrtoul(string, 10, option);
1182 kfree(string);
1183
1184 return rc;
1185 }
1186
1187 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
1188 unsigned long l_bound, unsigned long u_bound)
1189 {
1190 int ret;
1191
1192 ret = nfs_get_option_ul(args, option);
1193 if (ret != 0)
1194 return ret;
1195 if (*option < l_bound || *option > u_bound)
1196 return -ERANGE;
1197 return 0;
1198 }
1199
1200 /*
1201 * Error-check and convert a string of mount options from user space into
1202 * a data structure. The whole mount string is processed; bad options are
1203 * skipped as they are encountered. If there were no errors, return 1;
1204 * otherwise return 0 (zero).
1205 */
1206 static int nfs_parse_mount_options(char *raw,
1207 struct nfs_parsed_mount_data *mnt)
1208 {
1209 char *p, *string, *secdata;
1210 int rc, sloppy = 0, invalid_option = 0;
1211 unsigned short protofamily = AF_UNSPEC;
1212 unsigned short mountfamily = AF_UNSPEC;
1213
1214 if (!raw) {
1215 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1216 return 1;
1217 }
1218 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1219
1220 secdata = alloc_secdata();
1221 if (!secdata)
1222 goto out_nomem;
1223
1224 rc = security_sb_copy_data(raw, secdata);
1225 if (rc)
1226 goto out_security_failure;
1227
1228 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1229 if (rc)
1230 goto out_security_failure;
1231
1232 free_secdata(secdata);
1233
1234 while ((p = strsep(&raw, ",")) != NULL) {
1235 substring_t args[MAX_OPT_ARGS];
1236 unsigned long option;
1237 int token;
1238
1239 if (!*p)
1240 continue;
1241
1242 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1243
1244 token = match_token(p, nfs_mount_option_tokens, args);
1245 switch (token) {
1246
1247 /*
1248 * boolean options: foo/nofoo
1249 */
1250 case Opt_soft:
1251 mnt->flags |= NFS_MOUNT_SOFT;
1252 break;
1253 case Opt_hard:
1254 mnt->flags &= ~NFS_MOUNT_SOFT;
1255 break;
1256 case Opt_posix:
1257 mnt->flags |= NFS_MOUNT_POSIX;
1258 break;
1259 case Opt_noposix:
1260 mnt->flags &= ~NFS_MOUNT_POSIX;
1261 break;
1262 case Opt_cto:
1263 mnt->flags &= ~NFS_MOUNT_NOCTO;
1264 break;
1265 case Opt_nocto:
1266 mnt->flags |= NFS_MOUNT_NOCTO;
1267 break;
1268 case Opt_ac:
1269 mnt->flags &= ~NFS_MOUNT_NOAC;
1270 break;
1271 case Opt_noac:
1272 mnt->flags |= NFS_MOUNT_NOAC;
1273 break;
1274 case Opt_lock:
1275 mnt->flags &= ~NFS_MOUNT_NONLM;
1276 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1277 NFS_MOUNT_LOCAL_FCNTL);
1278 break;
1279 case Opt_nolock:
1280 mnt->flags |= NFS_MOUNT_NONLM;
1281 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1282 NFS_MOUNT_LOCAL_FCNTL);
1283 break;
1284 case Opt_udp:
1285 mnt->flags &= ~NFS_MOUNT_TCP;
1286 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1287 break;
1288 case Opt_tcp:
1289 mnt->flags |= NFS_MOUNT_TCP;
1290 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1291 break;
1292 case Opt_rdma:
1293 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1294 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1295 xprt_load_transport(p);
1296 break;
1297 case Opt_acl:
1298 mnt->flags &= ~NFS_MOUNT_NOACL;
1299 break;
1300 case Opt_noacl:
1301 mnt->flags |= NFS_MOUNT_NOACL;
1302 break;
1303 case Opt_rdirplus:
1304 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1305 break;
1306 case Opt_nordirplus:
1307 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1308 break;
1309 case Opt_sharecache:
1310 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1311 break;
1312 case Opt_nosharecache:
1313 mnt->flags |= NFS_MOUNT_UNSHARED;
1314 break;
1315 case Opt_resvport:
1316 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1317 break;
1318 case Opt_noresvport:
1319 mnt->flags |= NFS_MOUNT_NORESVPORT;
1320 break;
1321 case Opt_fscache:
1322 mnt->options |= NFS_OPTION_FSCACHE;
1323 kfree(mnt->fscache_uniq);
1324 mnt->fscache_uniq = NULL;
1325 break;
1326 case Opt_nofscache:
1327 mnt->options &= ~NFS_OPTION_FSCACHE;
1328 kfree(mnt->fscache_uniq);
1329 mnt->fscache_uniq = NULL;
1330 break;
1331 case Opt_migration:
1332 mnt->options |= NFS_OPTION_MIGRATION;
1333 break;
1334 case Opt_nomigration:
1335 mnt->options &= ~NFS_OPTION_MIGRATION;
1336 break;
1337
1338 /*
1339 * options that take numeric values
1340 */
1341 case Opt_port:
1342 if (nfs_get_option_ul(args, &option) ||
1343 option > USHRT_MAX)
1344 goto out_invalid_value;
1345 mnt->nfs_server.port = option;
1346 break;
1347 case Opt_rsize:
1348 if (nfs_get_option_ul(args, &option))
1349 goto out_invalid_value;
1350 mnt->rsize = option;
1351 break;
1352 case Opt_wsize:
1353 if (nfs_get_option_ul(args, &option))
1354 goto out_invalid_value;
1355 mnt->wsize = option;
1356 break;
1357 case Opt_bsize:
1358 if (nfs_get_option_ul(args, &option))
1359 goto out_invalid_value;
1360 mnt->bsize = option;
1361 break;
1362 case Opt_timeo:
1363 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
1364 goto out_invalid_value;
1365 mnt->timeo = option;
1366 break;
1367 case Opt_retrans:
1368 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
1369 goto out_invalid_value;
1370 mnt->retrans = option;
1371 break;
1372 case Opt_acregmin:
1373 if (nfs_get_option_ul(args, &option))
1374 goto out_invalid_value;
1375 mnt->acregmin = option;
1376 break;
1377 case Opt_acregmax:
1378 if (nfs_get_option_ul(args, &option))
1379 goto out_invalid_value;
1380 mnt->acregmax = option;
1381 break;
1382 case Opt_acdirmin:
1383 if (nfs_get_option_ul(args, &option))
1384 goto out_invalid_value;
1385 mnt->acdirmin = option;
1386 break;
1387 case Opt_acdirmax:
1388 if (nfs_get_option_ul(args, &option))
1389 goto out_invalid_value;
1390 mnt->acdirmax = option;
1391 break;
1392 case Opt_actimeo:
1393 if (nfs_get_option_ul(args, &option))
1394 goto out_invalid_value;
1395 mnt->acregmin = mnt->acregmax =
1396 mnt->acdirmin = mnt->acdirmax = option;
1397 break;
1398 case Opt_namelen:
1399 if (nfs_get_option_ul(args, &option))
1400 goto out_invalid_value;
1401 mnt->namlen = option;
1402 break;
1403 case Opt_mountport:
1404 if (nfs_get_option_ul(args, &option) ||
1405 option > USHRT_MAX)
1406 goto out_invalid_value;
1407 mnt->mount_server.port = option;
1408 break;
1409 case Opt_mountvers:
1410 if (nfs_get_option_ul(args, &option) ||
1411 option < NFS_MNT_VERSION ||
1412 option > NFS_MNT3_VERSION)
1413 goto out_invalid_value;
1414 mnt->mount_server.version = option;
1415 break;
1416 case Opt_minorversion:
1417 if (nfs_get_option_ul(args, &option))
1418 goto out_invalid_value;
1419 if (option > NFS4_MAX_MINOR_VERSION)
1420 goto out_invalid_value;
1421 mnt->minorversion = option;
1422 break;
1423
1424 /*
1425 * options that take text values
1426 */
1427 case Opt_nfsvers:
1428 string = match_strdup(args);
1429 if (string == NULL)
1430 goto out_nomem;
1431 rc = nfs_parse_version_string(string, mnt, args);
1432 kfree(string);
1433 if (!rc)
1434 goto out_invalid_value;
1435 break;
1436 case Opt_sec:
1437 string = match_strdup(args);
1438 if (string == NULL)
1439 goto out_nomem;
1440 rc = nfs_parse_security_flavors(string, mnt);
1441 kfree(string);
1442 if (!rc) {
1443 dfprintk(MOUNT, "NFS: unrecognized "
1444 "security flavor\n");
1445 return 0;
1446 }
1447 break;
1448 case Opt_proto:
1449 string = match_strdup(args);
1450 if (string == NULL)
1451 goto out_nomem;
1452 token = match_token(string,
1453 nfs_xprt_protocol_tokens, args);
1454
1455 protofamily = AF_INET;
1456 switch (token) {
1457 case Opt_xprt_udp6:
1458 protofamily = AF_INET6;
1459 /* fall through */
1460 case Opt_xprt_udp:
1461 mnt->flags &= ~NFS_MOUNT_TCP;
1462 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1463 break;
1464 case Opt_xprt_tcp6:
1465 protofamily = AF_INET6;
1466 /* fall through */
1467 case Opt_xprt_tcp:
1468 mnt->flags |= NFS_MOUNT_TCP;
1469 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1470 break;
1471 case Opt_xprt_rdma6:
1472 protofamily = AF_INET6;
1473 /* fall through */
1474 case Opt_xprt_rdma:
1475 /* vector side protocols to TCP */
1476 mnt->flags |= NFS_MOUNT_TCP;
1477 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1478 xprt_load_transport(string);
1479 break;
1480 default:
1481 dfprintk(MOUNT, "NFS: unrecognized "
1482 "transport protocol\n");
1483 kfree(string);
1484 return 0;
1485 }
1486 kfree(string);
1487 break;
1488 case Opt_mountproto:
1489 string = match_strdup(args);
1490 if (string == NULL)
1491 goto out_nomem;
1492 token = match_token(string,
1493 nfs_xprt_protocol_tokens, args);
1494 kfree(string);
1495
1496 mountfamily = AF_INET;
1497 switch (token) {
1498 case Opt_xprt_udp6:
1499 mountfamily = AF_INET6;
1500 /* fall through */
1501 case Opt_xprt_udp:
1502 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1503 break;
1504 case Opt_xprt_tcp6:
1505 mountfamily = AF_INET6;
1506 /* fall through */
1507 case Opt_xprt_tcp:
1508 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1509 break;
1510 case Opt_xprt_rdma: /* not used for side protocols */
1511 default:
1512 dfprintk(MOUNT, "NFS: unrecognized "
1513 "transport protocol\n");
1514 return 0;
1515 }
1516 break;
1517 case Opt_addr:
1518 string = match_strdup(args);
1519 if (string == NULL)
1520 goto out_nomem;
1521 mnt->nfs_server.addrlen =
1522 rpc_pton(mnt->net, string, strlen(string),
1523 (struct sockaddr *)
1524 &mnt->nfs_server.address,
1525 sizeof(mnt->nfs_server.address));
1526 kfree(string);
1527 if (mnt->nfs_server.addrlen == 0)
1528 goto out_invalid_address;
1529 break;
1530 case Opt_clientaddr:
1531 if (nfs_get_option_str(args, &mnt->client_address))
1532 goto out_nomem;
1533 break;
1534 case Opt_mounthost:
1535 if (nfs_get_option_str(args,
1536 &mnt->mount_server.hostname))
1537 goto out_nomem;
1538 break;
1539 case Opt_mountaddr:
1540 string = match_strdup(args);
1541 if (string == NULL)
1542 goto out_nomem;
1543 mnt->mount_server.addrlen =
1544 rpc_pton(mnt->net, string, strlen(string),
1545 (struct sockaddr *)
1546 &mnt->mount_server.address,
1547 sizeof(mnt->mount_server.address));
1548 kfree(string);
1549 if (mnt->mount_server.addrlen == 0)
1550 goto out_invalid_address;
1551 break;
1552 case Opt_lookupcache:
1553 string = match_strdup(args);
1554 if (string == NULL)
1555 goto out_nomem;
1556 token = match_token(string,
1557 nfs_lookupcache_tokens, args);
1558 kfree(string);
1559 switch (token) {
1560 case Opt_lookupcache_all:
1561 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1562 break;
1563 case Opt_lookupcache_positive:
1564 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1565 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1566 break;
1567 case Opt_lookupcache_none:
1568 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1569 break;
1570 default:
1571 dfprintk(MOUNT, "NFS: invalid "
1572 "lookupcache argument\n");
1573 return 0;
1574 };
1575 break;
1576 case Opt_fscache_uniq:
1577 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1578 goto out_nomem;
1579 mnt->options |= NFS_OPTION_FSCACHE;
1580 break;
1581 case Opt_local_lock:
1582 string = match_strdup(args);
1583 if (string == NULL)
1584 goto out_nomem;
1585 token = match_token(string, nfs_local_lock_tokens,
1586 args);
1587 kfree(string);
1588 switch (token) {
1589 case Opt_local_lock_all:
1590 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1591 NFS_MOUNT_LOCAL_FCNTL);
1592 break;
1593 case Opt_local_lock_flock:
1594 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1595 break;
1596 case Opt_local_lock_posix:
1597 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1598 break;
1599 case Opt_local_lock_none:
1600 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1601 NFS_MOUNT_LOCAL_FCNTL);
1602 break;
1603 default:
1604 dfprintk(MOUNT, "NFS: invalid "
1605 "local_lock argument\n");
1606 return 0;
1607 };
1608 break;
1609
1610 /*
1611 * Special options
1612 */
1613 case Opt_sloppy:
1614 sloppy = 1;
1615 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1616 break;
1617 case Opt_userspace:
1618 case Opt_deprecated:
1619 dfprintk(MOUNT, "NFS: ignoring mount option "
1620 "'%s'\n", p);
1621 break;
1622
1623 default:
1624 invalid_option = 1;
1625 dfprintk(MOUNT, "NFS: unrecognized mount option "
1626 "'%s'\n", p);
1627 }
1628 }
1629
1630 if (!sloppy && invalid_option)
1631 return 0;
1632
1633 if (mnt->minorversion && mnt->version != 4)
1634 goto out_minorversion_mismatch;
1635
1636 if (mnt->options & NFS_OPTION_MIGRATION &&
1637 (mnt->version != 4 || mnt->minorversion != 0))
1638 goto out_migration_misuse;
1639
1640 /*
1641 * verify that any proto=/mountproto= options match the address
1642 * families in the addr=/mountaddr= options.
1643 */
1644 if (protofamily != AF_UNSPEC &&
1645 protofamily != mnt->nfs_server.address.ss_family)
1646 goto out_proto_mismatch;
1647
1648 if (mountfamily != AF_UNSPEC) {
1649 if (mnt->mount_server.addrlen) {
1650 if (mountfamily != mnt->mount_server.address.ss_family)
1651 goto out_mountproto_mismatch;
1652 } else {
1653 if (mountfamily != mnt->nfs_server.address.ss_family)
1654 goto out_mountproto_mismatch;
1655 }
1656 }
1657
1658 return 1;
1659
1660 out_mountproto_mismatch:
1661 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1662 "option\n");
1663 return 0;
1664 out_proto_mismatch:
1665 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1666 return 0;
1667 out_invalid_address:
1668 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1669 return 0;
1670 out_invalid_value:
1671 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1672 return 0;
1673 out_minorversion_mismatch:
1674 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1675 "minorversion=%u\n", mnt->version, mnt->minorversion);
1676 return 0;
1677 out_migration_misuse:
1678 printk(KERN_INFO
1679 "NFS: 'migration' not supported for this NFS version\n");
1680 return 0;
1681 out_nomem:
1682 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1683 return 0;
1684 out_security_failure:
1685 free_secdata(secdata);
1686 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1687 return 0;
1688 }
1689
1690 /*
1691 * Ensure that a specified authtype in args->auth_info is supported by
1692 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1693 * -EACCES if not.
1694 */
1695 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1696 rpc_authflavor_t *server_authlist, unsigned int count)
1697 {
1698 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1699 bool found_auth_null = false;
1700 unsigned int i;
1701
1702 /*
1703 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1704 * must be in the list returned by the server.
1705 *
1706 * AUTH_NULL has a special meaning when it's in the server list - it
1707 * means that the server will ignore the rpc creds, so any flavor
1708 * can be used but still use the sec= that was specified.
1709 *
1710 * Note also that the MNT procedure in MNTv1 does not return a list
1711 * of supported security flavors. In this case, nfs_mount() fabricates
1712 * a security flavor list containing just AUTH_NULL.
1713 */
1714 for (i = 0; i < count; i++) {
1715 flavor = server_authlist[i];
1716
1717 if (nfs_auth_info_match(&args->auth_info, flavor))
1718 goto out;
1719
1720 if (flavor == RPC_AUTH_NULL)
1721 found_auth_null = true;
1722 }
1723
1724 if (found_auth_null) {
1725 flavor = args->auth_info.flavors[0];
1726 goto out;
1727 }
1728
1729 dfprintk(MOUNT,
1730 "NFS: specified auth flavors not supported by server\n");
1731 return -EACCES;
1732
1733 out:
1734 args->selected_flavor = flavor;
1735 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1736 return 0;
1737 }
1738
1739 /*
1740 * Use the remote server's MOUNT service to request the NFS file handle
1741 * corresponding to the provided path.
1742 */
1743 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1744 struct nfs_fh *root_fh,
1745 rpc_authflavor_t *server_authlist,
1746 unsigned int *server_authlist_len)
1747 {
1748 struct nfs_mount_request request = {
1749 .sap = (struct sockaddr *)
1750 &args->mount_server.address,
1751 .dirpath = args->nfs_server.export_path,
1752 .protocol = args->mount_server.protocol,
1753 .fh = root_fh,
1754 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1755 .auth_flav_len = server_authlist_len,
1756 .auth_flavs = server_authlist,
1757 .net = args->net,
1758 };
1759 int status;
1760
1761 if (args->mount_server.version == 0) {
1762 switch (args->version) {
1763 default:
1764 args->mount_server.version = NFS_MNT3_VERSION;
1765 break;
1766 case 2:
1767 args->mount_server.version = NFS_MNT_VERSION;
1768 }
1769 }
1770 request.version = args->mount_server.version;
1771
1772 if (args->mount_server.hostname)
1773 request.hostname = args->mount_server.hostname;
1774 else
1775 request.hostname = args->nfs_server.hostname;
1776
1777 /*
1778 * Construct the mount server's address.
1779 */
1780 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1781 memcpy(request.sap, &args->nfs_server.address,
1782 args->nfs_server.addrlen);
1783 args->mount_server.addrlen = args->nfs_server.addrlen;
1784 }
1785 request.salen = args->mount_server.addrlen;
1786 nfs_set_port(request.sap, &args->mount_server.port, 0);
1787
1788 /*
1789 * Now ask the mount server to map our export path
1790 * to a file handle.
1791 */
1792 status = nfs_mount(&request);
1793 if (status != 0) {
1794 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1795 request.hostname, status);
1796 return status;
1797 }
1798
1799 return 0;
1800 }
1801
1802 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1803 struct nfs_subversion *nfs_mod)
1804 {
1805 int status;
1806 unsigned int i;
1807 bool tried_auth_unix = false;
1808 bool auth_null_in_list = false;
1809 struct nfs_server *server = ERR_PTR(-EACCES);
1810 struct nfs_parsed_mount_data *args = mount_info->parsed;
1811 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1812 unsigned int authlist_len = ARRAY_SIZE(authlist);
1813
1814 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1815 &authlist_len);
1816 if (status)
1817 return ERR_PTR(status);
1818
1819 /*
1820 * Was a sec= authflavor specified in the options? First, verify
1821 * whether the server supports it, and then just try to use it if so.
1822 */
1823 if (args->auth_info.flavor_len > 0) {
1824 status = nfs_verify_authflavors(args, authlist, authlist_len);
1825 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1826 args->selected_flavor);
1827 if (status)
1828 return ERR_PTR(status);
1829 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1830 }
1831
1832 /*
1833 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1834 * SHOULD prefer the flavor listed first. However, some servers list
1835 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1836 */
1837 for (i = 0; i < authlist_len; ++i) {
1838 rpc_authflavor_t flavor;
1839 struct rpcsec_gss_info info;
1840
1841 flavor = authlist[i];
1842 switch (flavor) {
1843 case RPC_AUTH_UNIX:
1844 tried_auth_unix = true;
1845 break;
1846 case RPC_AUTH_NULL:
1847 auth_null_in_list = true;
1848 continue;
1849 default:
1850 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1851 continue;
1852 /* Fallthrough */
1853 }
1854 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1855 args->selected_flavor = flavor;
1856 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1857 if (!IS_ERR(server))
1858 return server;
1859 }
1860
1861 /*
1862 * Nothing we tried so far worked. At this point, give up if we've
1863 * already tried AUTH_UNIX or if the server's list doesn't contain
1864 * AUTH_NULL
1865 */
1866 if (tried_auth_unix || !auth_null_in_list)
1867 return server;
1868
1869 /* Last chance! Try AUTH_UNIX */
1870 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1871 args->selected_flavor = RPC_AUTH_UNIX;
1872 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1873 }
1874
1875 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1876 struct nfs_mount_info *mount_info,
1877 struct nfs_subversion *nfs_mod)
1878 {
1879 struct nfs_server *server;
1880
1881 if (mount_info->parsed->need_mount)
1882 server = nfs_try_mount_request(mount_info, nfs_mod);
1883 else
1884 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1885
1886 if (IS_ERR(server))
1887 return ERR_CAST(server);
1888
1889 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1890 }
1891 EXPORT_SYMBOL_GPL(nfs_try_mount);
1892
1893 /*
1894 * Split "dev_name" into "hostname:export_path".
1895 *
1896 * The leftmost colon demarks the split between the server's hostname
1897 * and the export path. If the hostname starts with a left square
1898 * bracket, then it may contain colons.
1899 *
1900 * Note: caller frees hostname and export path, even on error.
1901 */
1902 static int nfs_parse_devname(const char *dev_name,
1903 char **hostname, size_t maxnamlen,
1904 char **export_path, size_t maxpathlen)
1905 {
1906 size_t len;
1907 char *end;
1908
1909 if (unlikely(!dev_name || !*dev_name)) {
1910 dfprintk(MOUNT, "NFS: device name not specified\n");
1911 return -EINVAL;
1912 }
1913
1914 /* Is the host name protected with square brakcets? */
1915 if (*dev_name == '[') {
1916 end = strchr(++dev_name, ']');
1917 if (end == NULL || end[1] != ':')
1918 goto out_bad_devname;
1919
1920 len = end - dev_name;
1921 end++;
1922 } else {
1923 char *comma;
1924
1925 end = strchr(dev_name, ':');
1926 if (end == NULL)
1927 goto out_bad_devname;
1928 len = end - dev_name;
1929
1930 /* kill possible hostname list: not supported */
1931 comma = strchr(dev_name, ',');
1932 if (comma != NULL && comma < end)
1933 len = comma - dev_name;
1934 }
1935
1936 if (len > maxnamlen)
1937 goto out_hostname;
1938
1939 /* N.B. caller will free nfs_server.hostname in all cases */
1940 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1941 if (*hostname == NULL)
1942 goto out_nomem;
1943 len = strlen(++end);
1944 if (len > maxpathlen)
1945 goto out_path;
1946 *export_path = kstrndup(end, len, GFP_KERNEL);
1947 if (!*export_path)
1948 goto out_nomem;
1949
1950 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1951 return 0;
1952
1953 out_bad_devname:
1954 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1955 return -EINVAL;
1956
1957 out_nomem:
1958 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1959 return -ENOMEM;
1960
1961 out_hostname:
1962 dfprintk(MOUNT, "NFS: server hostname too long\n");
1963 return -ENAMETOOLONG;
1964
1965 out_path:
1966 dfprintk(MOUNT, "NFS: export pathname too long\n");
1967 return -ENAMETOOLONG;
1968 }
1969
1970 /*
1971 * Validate the NFS2/NFS3 mount data
1972 * - fills in the mount root filehandle
1973 *
1974 * For option strings, user space handles the following behaviors:
1975 *
1976 * + DNS: mapping server host name to IP address ("addr=" option)
1977 *
1978 * + failure mode: how to behave if a mount request can't be handled
1979 * immediately ("fg/bg" option)
1980 *
1981 * + retry: how often to retry a mount request ("retry=" option)
1982 *
1983 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1984 * mountproto=tcp after mountproto=udp, and so on
1985 */
1986 static int nfs23_validate_mount_data(void *options,
1987 struct nfs_parsed_mount_data *args,
1988 struct nfs_fh *mntfh,
1989 const char *dev_name)
1990 {
1991 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1992 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1993 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1994
1995 if (data == NULL)
1996 goto out_no_data;
1997
1998 args->version = NFS_DEFAULT_VERSION;
1999 switch (data->version) {
2000 case 1:
2001 data->namlen = 0; /* fall through */
2002 case 2:
2003 data->bsize = 0; /* fall through */
2004 case 3:
2005 if (data->flags & NFS_MOUNT_VER3)
2006 goto out_no_v3;
2007 data->root.size = NFS2_FHSIZE;
2008 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
2009 /* Turn off security negotiation */
2010 extra_flags |= NFS_MOUNT_SECFLAVOUR;
2011 /* fall through */
2012 case 4:
2013 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2014 goto out_no_sec;
2015 /* fall through */
2016 case 5:
2017 memset(data->context, 0, sizeof(data->context));
2018 /* fall through */
2019 case 6:
2020 if (data->flags & NFS_MOUNT_VER3) {
2021 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
2022 goto out_invalid_fh;
2023 mntfh->size = data->root.size;
2024 args->version = 3;
2025 } else {
2026 mntfh->size = NFS2_FHSIZE;
2027 args->version = 2;
2028 }
2029
2030
2031 memcpy(mntfh->data, data->root.data, mntfh->size);
2032 if (mntfh->size < sizeof(mntfh->data))
2033 memset(mntfh->data + mntfh->size, 0,
2034 sizeof(mntfh->data) - mntfh->size);
2035
2036 /*
2037 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2038 * can deal with.
2039 */
2040 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2041 args->flags |= extra_flags;
2042 args->rsize = data->rsize;
2043 args->wsize = data->wsize;
2044 args->timeo = data->timeo;
2045 args->retrans = data->retrans;
2046 args->acregmin = data->acregmin;
2047 args->acregmax = data->acregmax;
2048 args->acdirmin = data->acdirmin;
2049 args->acdirmax = data->acdirmax;
2050 args->need_mount = false;
2051
2052 memcpy(sap, &data->addr, sizeof(data->addr));
2053 args->nfs_server.addrlen = sizeof(data->addr);
2054 args->nfs_server.port = ntohs(data->addr.sin_port);
2055 if (sap->sa_family != AF_INET ||
2056 !nfs_verify_server_address(sap))
2057 goto out_no_address;
2058
2059 if (!(data->flags & NFS_MOUNT_TCP))
2060 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2061 /* N.B. caller will free nfs_server.hostname in all cases */
2062 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2063 args->namlen = data->namlen;
2064 args->bsize = data->bsize;
2065
2066 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2067 args->selected_flavor = data->pseudoflavor;
2068 else
2069 args->selected_flavor = RPC_AUTH_UNIX;
2070 if (!args->nfs_server.hostname)
2071 goto out_nomem;
2072
2073 if (!(data->flags & NFS_MOUNT_NONLM))
2074 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2075 NFS_MOUNT_LOCAL_FCNTL);
2076 else
2077 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2078 NFS_MOUNT_LOCAL_FCNTL);
2079 /*
2080 * The legacy version 6 binary mount data from userspace has a
2081 * field used only to transport selinux information into the
2082 * the kernel. To continue to support that functionality we
2083 * have a touch of selinux knowledge here in the NFS code. The
2084 * userspace code converted context=blah to just blah so we are
2085 * converting back to the full string selinux understands.
2086 */
2087 if (data->context[0]){
2088 #ifdef CONFIG_SECURITY_SELINUX
2089 int rc;
2090 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2091 if (!opts_str)
2092 return -ENOMEM;
2093 strcpy(opts_str, "context=");
2094 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2095 strcat(opts_str, &data->context[0]);
2096 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2097 kfree(opts_str);
2098 if (rc)
2099 return rc;
2100 #else
2101 return -EINVAL;
2102 #endif
2103 }
2104
2105 break;
2106 default:
2107 return NFS_TEXT_DATA;
2108 }
2109
2110 return 0;
2111
2112 out_no_data:
2113 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2114 return -EINVAL;
2115
2116 out_no_v3:
2117 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2118 data->version);
2119 return -EINVAL;
2120
2121 out_no_sec:
2122 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2123 return -EINVAL;
2124
2125 out_nomem:
2126 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2127 return -ENOMEM;
2128
2129 out_no_address:
2130 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2131 return -EINVAL;
2132
2133 out_invalid_fh:
2134 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2135 return -EINVAL;
2136 }
2137
2138 #if IS_ENABLED(CONFIG_NFS_V4)
2139 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2140 void *options,
2141 struct nfs_parsed_mount_data *args,
2142 struct nfs_fh *mntfh,
2143 const char *dev_name)
2144 {
2145 if (fs_type == &nfs_fs_type)
2146 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2147 return nfs4_validate_mount_data(options, args, dev_name);
2148 }
2149 #else
2150 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2151 void *options,
2152 struct nfs_parsed_mount_data *args,
2153 struct nfs_fh *mntfh,
2154 const char *dev_name)
2155 {
2156 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2157 }
2158 #endif
2159
2160 static int nfs_validate_text_mount_data(void *options,
2161 struct nfs_parsed_mount_data *args,
2162 const char *dev_name)
2163 {
2164 int port = 0;
2165 int max_namelen = PAGE_SIZE;
2166 int max_pathlen = NFS_MAXPATHLEN;
2167 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2168
2169 if (nfs_parse_mount_options((char *)options, args) == 0)
2170 return -EINVAL;
2171
2172 if (!nfs_verify_server_address(sap))
2173 goto out_no_address;
2174
2175 if (args->version == 4) {
2176 #if IS_ENABLED(CONFIG_NFS_V4)
2177 port = NFS_PORT;
2178 max_namelen = NFS4_MAXNAMLEN;
2179 max_pathlen = NFS4_MAXPATHLEN;
2180 nfs_validate_transport_protocol(args);
2181 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2182 goto out_invalid_transport_udp;
2183 nfs4_validate_mount_flags(args);
2184 #else
2185 goto out_v4_not_compiled;
2186 #endif /* CONFIG_NFS_V4 */
2187 } else
2188 nfs_set_mount_transport_protocol(args);
2189
2190 nfs_set_port(sap, &args->nfs_server.port, port);
2191
2192 return nfs_parse_devname(dev_name,
2193 &args->nfs_server.hostname,
2194 max_namelen,
2195 &args->nfs_server.export_path,
2196 max_pathlen);
2197
2198 #if !IS_ENABLED(CONFIG_NFS_V4)
2199 out_v4_not_compiled:
2200 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2201 return -EPROTONOSUPPORT;
2202 #else
2203 out_invalid_transport_udp:
2204 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2205 return -EINVAL;
2206 #endif /* !CONFIG_NFS_V4 */
2207
2208 out_no_address:
2209 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2210 return -EINVAL;
2211 }
2212
2213 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2214 | NFS_MOUNT_SECURE \
2215 | NFS_MOUNT_TCP \
2216 | NFS_MOUNT_VER3 \
2217 | NFS_MOUNT_KERBEROS \
2218 | NFS_MOUNT_NONLM \
2219 | NFS_MOUNT_BROKEN_SUID \
2220 | NFS_MOUNT_STRICTLOCK \
2221 | NFS_MOUNT_LEGACY_INTERFACE)
2222
2223 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2224 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2225
2226 static int
2227 nfs_compare_remount_data(struct nfs_server *nfss,
2228 struct nfs_parsed_mount_data *data)
2229 {
2230 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2231 data->rsize != nfss->rsize ||
2232 data->wsize != nfss->wsize ||
2233 data->version != nfss->nfs_client->rpc_ops->version ||
2234 data->minorversion != nfss->nfs_client->cl_minorversion ||
2235 data->retrans != nfss->client->cl_timeout->to_retries ||
2236 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2237 data->acregmin != nfss->acregmin / HZ ||
2238 data->acregmax != nfss->acregmax / HZ ||
2239 data->acdirmin != nfss->acdirmin / HZ ||
2240 data->acdirmax != nfss->acdirmax / HZ ||
2241 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2242 (data->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) ||
2243 data->nfs_server.port != nfss->port ||
2244 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2245 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2246 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2247 return -EINVAL;
2248
2249 return 0;
2250 }
2251
2252 int
2253 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2254 {
2255 int error;
2256 struct nfs_server *nfss = sb->s_fs_info;
2257 struct nfs_parsed_mount_data *data;
2258 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2259 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2260 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2261
2262 sync_filesystem(sb);
2263
2264 /*
2265 * Userspace mount programs that send binary options generally send
2266 * them populated with default values. We have no way to know which
2267 * ones were explicitly specified. Fall back to legacy behavior and
2268 * just return success.
2269 */
2270 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2271 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2272 options->version <= 6))))
2273 return 0;
2274
2275 data = kzalloc(sizeof(*data), GFP_KERNEL);
2276 if (data == NULL)
2277 return -ENOMEM;
2278
2279 /* fill out struct with values from existing mount */
2280 data->flags = nfss->flags;
2281 data->rsize = nfss->rsize;
2282 data->wsize = nfss->wsize;
2283 data->retrans = nfss->client->cl_timeout->to_retries;
2284 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2285 data->acregmin = nfss->acregmin / HZ;
2286 data->acregmax = nfss->acregmax / HZ;
2287 data->acdirmin = nfss->acdirmin / HZ;
2288 data->acdirmax = nfss->acdirmax / HZ;
2289 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2290 data->nfs_server.port = nfss->port;
2291 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2292 data->version = nfsvers;
2293 data->minorversion = nfss->nfs_client->cl_minorversion;
2294 data->net = current->nsproxy->net_ns;
2295 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2296 data->nfs_server.addrlen);
2297
2298 /* overwrite those values with any that were specified */
2299 error = -EINVAL;
2300 if (!nfs_parse_mount_options((char *)options, data))
2301 goto out;
2302
2303 /*
2304 * noac is a special case. It implies -o sync, but that's not
2305 * necessarily reflected in the mtab options. do_remount_sb
2306 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
2307 * remount options, so we have to explicitly reset it.
2308 */
2309 if (data->flags & NFS_MOUNT_NOAC)
2310 *flags |= SB_SYNCHRONOUS;
2311
2312 /* compare new mount options with old ones */
2313 error = nfs_compare_remount_data(nfss, data);
2314 out:
2315 kfree(data);
2316 return error;
2317 }
2318 EXPORT_SYMBOL_GPL(nfs_remount);
2319
2320 /*
2321 * Initialise the common bits of the superblock
2322 */
2323 static void nfs_initialise_sb(struct super_block *sb)
2324 {
2325 struct nfs_server *server = NFS_SB(sb);
2326
2327 sb->s_magic = NFS_SUPER_MAGIC;
2328
2329 /* We probably want something more informative here */
2330 snprintf(sb->s_id, sizeof(sb->s_id),
2331 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2332
2333 if (sb->s_blocksize == 0)
2334 sb->s_blocksize = nfs_block_bits(server->wsize,
2335 &sb->s_blocksize_bits);
2336
2337 nfs_super_set_maxbytes(sb, server->maxfilesize);
2338 }
2339
2340 /*
2341 * Finish setting up an NFS2/3 superblock
2342 */
2343 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2344 {
2345 struct nfs_parsed_mount_data *data = mount_info->parsed;
2346 struct nfs_server *server = NFS_SB(sb);
2347
2348 sb->s_blocksize_bits = 0;
2349 sb->s_blocksize = 0;
2350 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2351 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2352 if (data && data->bsize)
2353 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2354
2355 if (server->nfs_client->rpc_ops->version != 2) {
2356 /* The VFS shouldn't apply the umask to mode bits. We will do
2357 * so ourselves when necessary.
2358 */
2359 sb->s_flags |= SB_POSIXACL;
2360 sb->s_time_gran = 1;
2361 sb->s_export_op = &nfs_export_ops;
2362 }
2363
2364 nfs_initialise_sb(sb);
2365 }
2366 EXPORT_SYMBOL_GPL(nfs_fill_super);
2367
2368 /*
2369 * Finish setting up a cloned NFS2/3/4 superblock
2370 */
2371 static void nfs_clone_super(struct super_block *sb,
2372 struct nfs_mount_info *mount_info)
2373 {
2374 const struct super_block *old_sb = mount_info->cloned->sb;
2375 struct nfs_server *server = NFS_SB(sb);
2376
2377 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2378 sb->s_blocksize = old_sb->s_blocksize;
2379 sb->s_maxbytes = old_sb->s_maxbytes;
2380 sb->s_xattr = old_sb->s_xattr;
2381 sb->s_op = old_sb->s_op;
2382 sb->s_time_gran = 1;
2383 sb->s_export_op = old_sb->s_export_op;
2384
2385 if (server->nfs_client->rpc_ops->version != 2) {
2386 /* The VFS shouldn't apply the umask to mode bits. We will do
2387 * so ourselves when necessary.
2388 */
2389 sb->s_flags |= SB_POSIXACL;
2390 }
2391
2392 nfs_initialise_sb(sb);
2393 }
2394
2395 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2396 {
2397 const struct nfs_server *a = s->s_fs_info;
2398 const struct rpc_clnt *clnt_a = a->client;
2399 const struct rpc_clnt *clnt_b = b->client;
2400
2401 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2402 goto Ebusy;
2403 if (a->nfs_client != b->nfs_client)
2404 goto Ebusy;
2405 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2406 goto Ebusy;
2407 if (a->wsize != b->wsize)
2408 goto Ebusy;
2409 if (a->rsize != b->rsize)
2410 goto Ebusy;
2411 if (a->acregmin != b->acregmin)
2412 goto Ebusy;
2413 if (a->acregmax != b->acregmax)
2414 goto Ebusy;
2415 if (a->acdirmin != b->acdirmin)
2416 goto Ebusy;
2417 if (a->acdirmax != b->acdirmax)
2418 goto Ebusy;
2419 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2420 goto Ebusy;
2421 return 1;
2422 Ebusy:
2423 return 0;
2424 }
2425
2426 struct nfs_sb_mountdata {
2427 struct nfs_server *server;
2428 int mntflags;
2429 };
2430
2431 static int nfs_set_super(struct super_block *s, void *data)
2432 {
2433 struct nfs_sb_mountdata *sb_mntdata = data;
2434 struct nfs_server *server = sb_mntdata->server;
2435 int ret;
2436
2437 s->s_flags = sb_mntdata->mntflags;
2438 s->s_fs_info = server;
2439 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2440 ret = set_anon_super(s, server);
2441 if (ret == 0)
2442 server->s_dev = s->s_dev;
2443 return ret;
2444 }
2445
2446 static int nfs_compare_super_address(struct nfs_server *server1,
2447 struct nfs_server *server2)
2448 {
2449 struct sockaddr *sap1, *sap2;
2450 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
2451 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
2452
2453 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
2454 return 0;
2455
2456 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2457 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2458
2459 if (sap1->sa_family != sap2->sa_family)
2460 return 0;
2461
2462 switch (sap1->sa_family) {
2463 case AF_INET: {
2464 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2465 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2466 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2467 return 0;
2468 if (sin1->sin_port != sin2->sin_port)
2469 return 0;
2470 break;
2471 }
2472 case AF_INET6: {
2473 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2474 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2475 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2476 return 0;
2477 if (sin1->sin6_port != sin2->sin6_port)
2478 return 0;
2479 break;
2480 }
2481 default:
2482 return 0;
2483 }
2484
2485 return 1;
2486 }
2487
2488 static int nfs_compare_super(struct super_block *sb, void *data)
2489 {
2490 struct nfs_sb_mountdata *sb_mntdata = data;
2491 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2492 int mntflags = sb_mntdata->mntflags;
2493
2494 if (!nfs_compare_super_address(old, server))
2495 return 0;
2496 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2497 if (old->flags & NFS_MOUNT_UNSHARED)
2498 return 0;
2499 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2500 return 0;
2501 return nfs_compare_mount_options(sb, server, mntflags);
2502 }
2503
2504 #ifdef CONFIG_NFS_FSCACHE
2505 static void nfs_get_cache_cookie(struct super_block *sb,
2506 struct nfs_parsed_mount_data *parsed,
2507 struct nfs_clone_mount *cloned)
2508 {
2509 struct nfs_server *nfss = NFS_SB(sb);
2510 char *uniq = NULL;
2511 int ulen = 0;
2512
2513 nfss->fscache_key = NULL;
2514 nfss->fscache = NULL;
2515
2516 if (parsed) {
2517 if (!(parsed->options & NFS_OPTION_FSCACHE))
2518 return;
2519 if (parsed->fscache_uniq) {
2520 uniq = parsed->fscache_uniq;
2521 ulen = strlen(parsed->fscache_uniq);
2522 }
2523 } else if (cloned) {
2524 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2525 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2526 return;
2527 if (mnt_s->fscache_key) {
2528 uniq = mnt_s->fscache_key->key.uniquifier;
2529 ulen = mnt_s->fscache_key->key.uniq_len;
2530 };
2531 } else
2532 return;
2533
2534 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2535 }
2536 #else
2537 static void nfs_get_cache_cookie(struct super_block *sb,
2538 struct nfs_parsed_mount_data *parsed,
2539 struct nfs_clone_mount *cloned)
2540 {
2541 }
2542 #endif
2543
2544 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2545 struct nfs_mount_info *mount_info)
2546 {
2547 int error;
2548 unsigned long kflags = 0, kflags_out = 0;
2549 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2550 kflags |= SECURITY_LSM_NATIVE_LABELS;
2551
2552 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2553 kflags, &kflags_out);
2554 if (error)
2555 goto err;
2556
2557 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2558 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2559 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2560 err:
2561 return error;
2562 }
2563 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2564
2565 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2566 struct nfs_mount_info *mount_info)
2567 {
2568 int error;
2569 unsigned long kflags = 0, kflags_out = 0;
2570
2571 /* clone any lsm security options from the parent to the new sb */
2572 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2573 return -ESTALE;
2574
2575 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2576 kflags |= SECURITY_LSM_NATIVE_LABELS;
2577
2578 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags,
2579 &kflags_out);
2580 if (error)
2581 return error;
2582
2583 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2584 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2585 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2586 return 0;
2587 }
2588 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2589
2590 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2591 int flags, const char *dev_name,
2592 struct nfs_mount_info *mount_info,
2593 struct nfs_subversion *nfs_mod)
2594 {
2595 struct super_block *s;
2596 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2597 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2598 struct nfs_sb_mountdata sb_mntdata = {
2599 .mntflags = flags,
2600 .server = server,
2601 };
2602 int error;
2603
2604 if (server->flags & NFS_MOUNT_UNSHARED)
2605 compare_super = NULL;
2606
2607 /* -o noac implies -o sync */
2608 if (server->flags & NFS_MOUNT_NOAC)
2609 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2610
2611 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2612 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS)
2613 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2614
2615 /* Get a superblock - note that we may end up sharing one that already exists */
2616 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2617 if (IS_ERR(s)) {
2618 mntroot = ERR_CAST(s);
2619 goto out_err_nosb;
2620 }
2621
2622 if (s->s_fs_info != server) {
2623 nfs_free_server(server);
2624 server = NULL;
2625 } else {
2626 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
2627 MINOR(server->s_dev));
2628 if (error) {
2629 mntroot = ERR_PTR(error);
2630 goto error_splat_super;
2631 }
2632 s->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD;
2633 server->super = s;
2634 }
2635
2636 if (!s->s_root) {
2637 /* initial superblock/root creation */
2638 mount_info->fill_super(s, mount_info);
2639 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2640 if (!(server->flags & NFS_MOUNT_UNSHARED))
2641 s->s_iflags |= SB_I_MULTIROOT;
2642 }
2643
2644 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2645 if (IS_ERR(mntroot))
2646 goto error_splat_super;
2647
2648 error = mount_info->set_security(s, mntroot, mount_info);
2649 if (error)
2650 goto error_splat_root;
2651
2652 s->s_flags |= SB_ACTIVE;
2653
2654 out:
2655 return mntroot;
2656
2657 out_err_nosb:
2658 nfs_free_server(server);
2659 goto out;
2660
2661 error_splat_root:
2662 dput(mntroot);
2663 mntroot = ERR_PTR(error);
2664 error_splat_super:
2665 deactivate_locked_super(s);
2666 goto out;
2667 }
2668 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2669
2670 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2671 int flags, const char *dev_name, void *raw_data)
2672 {
2673 struct nfs_mount_info mount_info = {
2674 .fill_super = nfs_fill_super,
2675 .set_security = nfs_set_sb_security,
2676 };
2677 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2678 struct nfs_subversion *nfs_mod;
2679 int error;
2680
2681 mount_info.parsed = nfs_alloc_parsed_mount_data();
2682 mount_info.mntfh = nfs_alloc_fhandle();
2683 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2684 goto out;
2685
2686 /* Validate the mount data */
2687 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2688 if (error == NFS_TEXT_DATA)
2689 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2690 if (error < 0) {
2691 mntroot = ERR_PTR(error);
2692 goto out;
2693 }
2694
2695 nfs_mod = get_nfs_version(mount_info.parsed->version);
2696 if (IS_ERR(nfs_mod)) {
2697 mntroot = ERR_CAST(nfs_mod);
2698 goto out;
2699 }
2700
2701 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2702
2703 put_nfs_version(nfs_mod);
2704 out:
2705 nfs_free_parsed_mount_data(mount_info.parsed);
2706 nfs_free_fhandle(mount_info.mntfh);
2707 return mntroot;
2708 }
2709 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2710
2711 /*
2712 * Destroy an NFS2/3 superblock
2713 */
2714 void nfs_kill_super(struct super_block *s)
2715 {
2716 struct nfs_server *server = NFS_SB(s);
2717 dev_t dev = s->s_dev;
2718
2719 generic_shutdown_super(s);
2720
2721 nfs_fscache_release_super_cookie(s);
2722
2723 nfs_free_server(server);
2724 free_anon_bdev(dev);
2725 }
2726 EXPORT_SYMBOL_GPL(nfs_kill_super);
2727
2728 /*
2729 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2730 */
2731 static struct dentry *
2732 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2733 const char *dev_name, void *raw_data)
2734 {
2735 struct nfs_clone_mount *data = raw_data;
2736 struct nfs_mount_info mount_info = {
2737 .fill_super = nfs_clone_super,
2738 .set_security = nfs_clone_sb_security,
2739 .cloned = data,
2740 };
2741 struct nfs_server *server;
2742 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2743 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2744
2745 dprintk("--> nfs_xdev_mount()\n");
2746
2747 mount_info.mntfh = mount_info.cloned->fh;
2748
2749 /* create a new volume representation */
2750 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2751
2752 if (IS_ERR(server))
2753 mntroot = ERR_CAST(server);
2754 else
2755 mntroot = nfs_fs_mount_common(server, flags,
2756 dev_name, &mount_info, nfs_mod);
2757
2758 dprintk("<-- nfs_xdev_mount() = %ld\n",
2759 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2760 return mntroot;
2761 }
2762
2763 #if IS_ENABLED(CONFIG_NFS_V4)
2764
2765 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2766 {
2767 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2768 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2769 }
2770
2771 /*
2772 * Validate NFSv4 mount options
2773 */
2774 static int nfs4_validate_mount_data(void *options,
2775 struct nfs_parsed_mount_data *args,
2776 const char *dev_name)
2777 {
2778 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2779 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2780 char *c;
2781
2782 if (data == NULL)
2783 goto out_no_data;
2784
2785 args->version = 4;
2786
2787 switch (data->version) {
2788 case 1:
2789 if (data->host_addrlen > sizeof(args->nfs_server.address))
2790 goto out_no_address;
2791 if (data->host_addrlen == 0)
2792 goto out_no_address;
2793 args->nfs_server.addrlen = data->host_addrlen;
2794 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2795 return -EFAULT;
2796 if (!nfs_verify_server_address(sap))
2797 goto out_no_address;
2798 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2799
2800 if (data->auth_flavourlen) {
2801 rpc_authflavor_t pseudoflavor;
2802 if (data->auth_flavourlen > 1)
2803 goto out_inval_auth;
2804 if (copy_from_user(&pseudoflavor,
2805 data->auth_flavours,
2806 sizeof(pseudoflavor)))
2807 return -EFAULT;
2808 args->selected_flavor = pseudoflavor;
2809 } else
2810 args->selected_flavor = RPC_AUTH_UNIX;
2811
2812 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2813 if (IS_ERR(c))
2814 return PTR_ERR(c);
2815 args->nfs_server.hostname = c;
2816
2817 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2818 if (IS_ERR(c))
2819 return PTR_ERR(c);
2820 args->nfs_server.export_path = c;
2821 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2822
2823 c = strndup_user(data->client_addr.data, 16);
2824 if (IS_ERR(c))
2825 return PTR_ERR(c);
2826 args->client_address = c;
2827
2828 /*
2829 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2830 * can deal with.
2831 */
2832
2833 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2834 args->rsize = data->rsize;
2835 args->wsize = data->wsize;
2836 args->timeo = data->timeo;
2837 args->retrans = data->retrans;
2838 args->acregmin = data->acregmin;
2839 args->acregmax = data->acregmax;
2840 args->acdirmin = data->acdirmin;
2841 args->acdirmax = data->acdirmax;
2842 args->nfs_server.protocol = data->proto;
2843 nfs_validate_transport_protocol(args);
2844 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2845 goto out_invalid_transport_udp;
2846
2847 break;
2848 default:
2849 return NFS_TEXT_DATA;
2850 }
2851
2852 return 0;
2853
2854 out_no_data:
2855 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2856 return -EINVAL;
2857
2858 out_inval_auth:
2859 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2860 data->auth_flavourlen);
2861 return -EINVAL;
2862
2863 out_no_address:
2864 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2865 return -EINVAL;
2866
2867 out_invalid_transport_udp:
2868 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2869 return -EINVAL;
2870 }
2871
2872 /*
2873 * NFS v4 module parameters need to stay in the
2874 * NFS client for backwards compatibility
2875 */
2876 unsigned int nfs_callback_set_tcpport;
2877 unsigned short nfs_callback_nr_threads;
2878 /* Default cache timeout is 10 minutes */
2879 unsigned int nfs_idmap_cache_timeout = 600;
2880 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2881 bool nfs4_disable_idmapping = true;
2882 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2883 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
2884 unsigned short send_implementation_id = 1;
2885 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2886 bool recover_lost_locks = false;
2887
2888 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
2889 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2890 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2891 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2892 EXPORT_SYMBOL_GPL(max_session_slots);
2893 EXPORT_SYMBOL_GPL(max_session_cb_slots);
2894 EXPORT_SYMBOL_GPL(send_implementation_id);
2895 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2896 EXPORT_SYMBOL_GPL(recover_lost_locks);
2897
2898 #define NFS_CALLBACK_MAXPORTNR (65535U)
2899
2900 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2901 {
2902 unsigned long num;
2903 int ret;
2904
2905 if (!val)
2906 return -EINVAL;
2907 ret = kstrtoul(val, 0, &num);
2908 if (ret || num > NFS_CALLBACK_MAXPORTNR)
2909 return -EINVAL;
2910 *((unsigned int *)kp->arg) = num;
2911 return 0;
2912 }
2913 static const struct kernel_param_ops param_ops_portnr = {
2914 .set = param_set_portnr,
2915 .get = param_get_uint,
2916 };
2917 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2918
2919 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2920 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
2921 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
2922 "assigned to the NFSv4 callback channels.");
2923 module_param(nfs_idmap_cache_timeout, int, 0644);
2924 module_param(nfs4_disable_idmapping, bool, 0644);
2925 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2926 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2927 MODULE_PARM_DESC(nfs4_disable_idmapping,
2928 "Turn off NFSv4 idmapping when using 'sec=sys'");
2929 module_param(max_session_slots, ushort, 0644);
2930 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2931 "requests the client will negotiate");
2932 module_param(max_session_cb_slots, ushort, 0644);
2933 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
2934 "callbacks the client will process for a given server");
2935 module_param(send_implementation_id, ushort, 0644);
2936 MODULE_PARM_DESC(send_implementation_id,
2937 "Send implementation ID with NFSv4.1 exchange_id");
2938 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2939
2940 module_param(recover_lost_locks, bool, 0644);
2941 MODULE_PARM_DESC(recover_lost_locks,
2942 "If the server reports that a lock might be lost, "
2943 "try to recover it risking data corruption.");
2944
2945
2946 #endif /* CONFIG_NFS_V4 */
Linux with added FPC-III support