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nfs: get rid of ->set_security()
[mirror_ubuntu-jammy-kernel.git] / fs / nfs / super.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/super.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 * Split from inode.c by David Howells <dhowells@redhat.com>
16 *
17 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
18 * particular server are held in the same superblock
19 * - NFS superblocks can have several effective roots to the dentry tree
20 * - directory type roots are spliced into the tree when a path from one root reaches the root
21 * of another (see nfs_lookup())
22 */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26
27 #include <linux/time.h>
28 #include <linux/kernel.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/stat.h>
32 #include <linux/errno.h>
33 #include <linux/unistd.h>
34 #include <linux/sunrpc/clnt.h>
35 #include <linux/sunrpc/addr.h>
36 #include <linux/sunrpc/stats.h>
37 #include <linux/sunrpc/metrics.h>
38 #include <linux/sunrpc/xprtsock.h>
39 #include <linux/sunrpc/xprtrdma.h>
40 #include <linux/nfs_fs.h>
41 #include <linux/nfs_mount.h>
42 #include <linux/nfs4_mount.h>
43 #include <linux/lockd/bind.h>
44 #include <linux/seq_file.h>
45 #include <linux/mount.h>
46 #include <linux/namei.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 <linux/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 #define NFS_MAX_CONNECTIONS 16
81
82 enum {
83 /* Mount options that take no arguments */
84 Opt_soft, Opt_softerr, Opt_hard,
85 Opt_posix, Opt_noposix,
86 Opt_cto, Opt_nocto,
87 Opt_ac, Opt_noac,
88 Opt_lock, Opt_nolock,
89 Opt_udp, Opt_tcp, Opt_rdma,
90 Opt_acl, Opt_noacl,
91 Opt_rdirplus, Opt_nordirplus,
92 Opt_sharecache, Opt_nosharecache,
93 Opt_resvport, Opt_noresvport,
94 Opt_fscache, Opt_nofscache,
95 Opt_migration, Opt_nomigration,
96
97 /* Mount options that take integer arguments */
98 Opt_port,
99 Opt_rsize, Opt_wsize, Opt_bsize,
100 Opt_timeo, Opt_retrans,
101 Opt_acregmin, Opt_acregmax,
102 Opt_acdirmin, Opt_acdirmax,
103 Opt_actimeo,
104 Opt_namelen,
105 Opt_mountport,
106 Opt_mountvers,
107 Opt_minorversion,
108
109 /* Mount options that take string arguments */
110 Opt_nfsvers,
111 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
112 Opt_addr, Opt_mountaddr, Opt_clientaddr,
113 Opt_nconnect,
114 Opt_lookupcache,
115 Opt_fscache_uniq,
116 Opt_local_lock,
117
118 /* Special mount options */
119 Opt_userspace, Opt_deprecated, Opt_sloppy,
120
121 Opt_err
122 };
123
124 static const match_table_t nfs_mount_option_tokens = {
125 { Opt_userspace, "bg" },
126 { Opt_userspace, "fg" },
127 { Opt_userspace, "retry=%s" },
128
129 { Opt_sloppy, "sloppy" },
130
131 { Opt_soft, "soft" },
132 { Opt_softerr, "softerr" },
133 { Opt_hard, "hard" },
134 { Opt_deprecated, "intr" },
135 { Opt_deprecated, "nointr" },
136 { Opt_posix, "posix" },
137 { Opt_noposix, "noposix" },
138 { Opt_cto, "cto" },
139 { Opt_nocto, "nocto" },
140 { Opt_ac, "ac" },
141 { Opt_noac, "noac" },
142 { Opt_lock, "lock" },
143 { Opt_nolock, "nolock" },
144 { Opt_udp, "udp" },
145 { Opt_tcp, "tcp" },
146 { Opt_rdma, "rdma" },
147 { Opt_acl, "acl" },
148 { Opt_noacl, "noacl" },
149 { Opt_rdirplus, "rdirplus" },
150 { Opt_nordirplus, "nordirplus" },
151 { Opt_sharecache, "sharecache" },
152 { Opt_nosharecache, "nosharecache" },
153 { Opt_resvport, "resvport" },
154 { Opt_noresvport, "noresvport" },
155 { Opt_fscache, "fsc" },
156 { Opt_nofscache, "nofsc" },
157 { Opt_migration, "migration" },
158 { Opt_nomigration, "nomigration" },
159
160 { Opt_port, "port=%s" },
161 { Opt_rsize, "rsize=%s" },
162 { Opt_wsize, "wsize=%s" },
163 { Opt_bsize, "bsize=%s" },
164 { Opt_timeo, "timeo=%s" },
165 { Opt_retrans, "retrans=%s" },
166 { Opt_acregmin, "acregmin=%s" },
167 { Opt_acregmax, "acregmax=%s" },
168 { Opt_acdirmin, "acdirmin=%s" },
169 { Opt_acdirmax, "acdirmax=%s" },
170 { Opt_actimeo, "actimeo=%s" },
171 { Opt_namelen, "namlen=%s" },
172 { Opt_mountport, "mountport=%s" },
173 { Opt_mountvers, "mountvers=%s" },
174 { Opt_minorversion, "minorversion=%s" },
175
176 { Opt_nfsvers, "nfsvers=%s" },
177 { Opt_nfsvers, "vers=%s" },
178
179 { Opt_sec, "sec=%s" },
180 { Opt_proto, "proto=%s" },
181 { Opt_mountproto, "mountproto=%s" },
182 { Opt_addr, "addr=%s" },
183 { Opt_clientaddr, "clientaddr=%s" },
184 { Opt_mounthost, "mounthost=%s" },
185 { Opt_mountaddr, "mountaddr=%s" },
186
187 { Opt_nconnect, "nconnect=%s" },
188
189 { Opt_lookupcache, "lookupcache=%s" },
190 { Opt_fscache_uniq, "fsc=%s" },
191 { Opt_local_lock, "local_lock=%s" },
192
193 /* The following needs to be listed after all other options */
194 { Opt_nfsvers, "v%s" },
195
196 { Opt_err, NULL }
197 };
198
199 enum {
200 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
201 Opt_xprt_rdma6,
202
203 Opt_xprt_err
204 };
205
206 static const match_table_t nfs_xprt_protocol_tokens = {
207 { Opt_xprt_udp, "udp" },
208 { Opt_xprt_udp6, "udp6" },
209 { Opt_xprt_tcp, "tcp" },
210 { Opt_xprt_tcp6, "tcp6" },
211 { Opt_xprt_rdma, "rdma" },
212 { Opt_xprt_rdma6, "rdma6" },
213
214 { Opt_xprt_err, NULL }
215 };
216
217 enum {
218 Opt_sec_none, Opt_sec_sys,
219 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
220 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
221 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
222
223 Opt_sec_err
224 };
225
226 static const match_table_t nfs_secflavor_tokens = {
227 { Opt_sec_none, "none" },
228 { Opt_sec_none, "null" },
229 { Opt_sec_sys, "sys" },
230
231 { Opt_sec_krb5, "krb5" },
232 { Opt_sec_krb5i, "krb5i" },
233 { Opt_sec_krb5p, "krb5p" },
234
235 { Opt_sec_lkey, "lkey" },
236 { Opt_sec_lkeyi, "lkeyi" },
237 { Opt_sec_lkeyp, "lkeyp" },
238
239 { Opt_sec_spkm, "spkm3" },
240 { Opt_sec_spkmi, "spkm3i" },
241 { Opt_sec_spkmp, "spkm3p" },
242
243 { Opt_sec_err, NULL }
244 };
245
246 enum {
247 Opt_lookupcache_all, Opt_lookupcache_positive,
248 Opt_lookupcache_none,
249
250 Opt_lookupcache_err
251 };
252
253 static match_table_t nfs_lookupcache_tokens = {
254 { Opt_lookupcache_all, "all" },
255 { Opt_lookupcache_positive, "pos" },
256 { Opt_lookupcache_positive, "positive" },
257 { Opt_lookupcache_none, "none" },
258
259 { Opt_lookupcache_err, NULL }
260 };
261
262 enum {
263 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
264 Opt_local_lock_none,
265
266 Opt_local_lock_err
267 };
268
269 static match_table_t nfs_local_lock_tokens = {
270 { Opt_local_lock_all, "all" },
271 { Opt_local_lock_flock, "flock" },
272 { Opt_local_lock_posix, "posix" },
273 { Opt_local_lock_none, "none" },
274
275 { Opt_local_lock_err, NULL }
276 };
277
278 enum {
279 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
280 Opt_vers_4_1, Opt_vers_4_2,
281
282 Opt_vers_err
283 };
284
285 static match_table_t nfs_vers_tokens = {
286 { Opt_vers_2, "2" },
287 { Opt_vers_3, "3" },
288 { Opt_vers_4, "4" },
289 { Opt_vers_4_0, "4.0" },
290 { Opt_vers_4_1, "4.1" },
291 { Opt_vers_4_2, "4.2" },
292
293 { Opt_vers_err, NULL }
294 };
295
296 static struct dentry *nfs_prepared_mount(struct file_system_type *fs_type,
297 int flags, const char *dev_name, void *raw_data);
298
299 struct file_system_type nfs_fs_type = {
300 .owner = THIS_MODULE,
301 .name = "nfs",
302 .mount = nfs_fs_mount,
303 .kill_sb = nfs_kill_super,
304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
305 };
306 MODULE_ALIAS_FS("nfs");
307 EXPORT_SYMBOL_GPL(nfs_fs_type);
308
309 struct file_system_type nfs_prepared_fs_type = {
310 .owner = THIS_MODULE,
311 .name = "nfs",
312 .mount = nfs_prepared_mount,
313 .kill_sb = nfs_kill_super,
314 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
315 };
316 EXPORT_SYMBOL_GPL(nfs_prepared_fs_type);
317
318 const struct super_operations nfs_sops = {
319 .alloc_inode = nfs_alloc_inode,
320 .free_inode = nfs_free_inode,
321 .write_inode = nfs_write_inode,
322 .drop_inode = nfs_drop_inode,
323 .statfs = nfs_statfs,
324 .evict_inode = nfs_evict_inode,
325 .umount_begin = nfs_umount_begin,
326 .show_options = nfs_show_options,
327 .show_devname = nfs_show_devname,
328 .show_path = nfs_show_path,
329 .show_stats = nfs_show_stats,
330 .remount_fs = nfs_remount,
331 };
332 EXPORT_SYMBOL_GPL(nfs_sops);
333
334 #if IS_ENABLED(CONFIG_NFS_V4)
335 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
336 static int nfs4_validate_mount_data(void *options,
337 struct nfs_parsed_mount_data *args, const char *dev_name);
338
339 struct file_system_type nfs4_fs_type = {
340 .owner = THIS_MODULE,
341 .name = "nfs4",
342 .mount = nfs_fs_mount,
343 .kill_sb = nfs_kill_super,
344 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
345 };
346 MODULE_ALIAS_FS("nfs4");
347 MODULE_ALIAS("nfs4");
348 EXPORT_SYMBOL_GPL(nfs4_fs_type);
349
350 static int __init register_nfs4_fs(void)
351 {
352 return register_filesystem(&nfs4_fs_type);
353 }
354
355 static void unregister_nfs4_fs(void)
356 {
357 unregister_filesystem(&nfs4_fs_type);
358 }
359 #else
360 static int __init register_nfs4_fs(void)
361 {
362 return 0;
363 }
364
365 static void unregister_nfs4_fs(void)
366 {
367 }
368 #endif
369
370 static struct shrinker acl_shrinker = {
371 .count_objects = nfs_access_cache_count,
372 .scan_objects = nfs_access_cache_scan,
373 .seeks = DEFAULT_SEEKS,
374 };
375
376 /*
377 * Register the NFS filesystems
378 */
379 int __init register_nfs_fs(void)
380 {
381 int ret;
382
383 ret = register_filesystem(&nfs_fs_type);
384 if (ret < 0)
385 goto error_0;
386
387 ret = register_nfs4_fs();
388 if (ret < 0)
389 goto error_1;
390
391 ret = nfs_register_sysctl();
392 if (ret < 0)
393 goto error_2;
394 ret = register_shrinker(&acl_shrinker);
395 if (ret < 0)
396 goto error_3;
397 return 0;
398 error_3:
399 nfs_unregister_sysctl();
400 error_2:
401 unregister_nfs4_fs();
402 error_1:
403 unregister_filesystem(&nfs_fs_type);
404 error_0:
405 return ret;
406 }
407
408 /*
409 * Unregister the NFS filesystems
410 */
411 void __exit unregister_nfs_fs(void)
412 {
413 unregister_shrinker(&acl_shrinker);
414 nfs_unregister_sysctl();
415 unregister_nfs4_fs();
416 unregister_filesystem(&nfs_fs_type);
417 }
418
419 bool nfs_sb_active(struct super_block *sb)
420 {
421 struct nfs_server *server = NFS_SB(sb);
422
423 if (!atomic_inc_not_zero(&sb->s_active))
424 return false;
425 if (atomic_inc_return(&server->active) != 1)
426 atomic_dec(&sb->s_active);
427 return true;
428 }
429 EXPORT_SYMBOL_GPL(nfs_sb_active);
430
431 void nfs_sb_deactive(struct super_block *sb)
432 {
433 struct nfs_server *server = NFS_SB(sb);
434
435 if (atomic_dec_and_test(&server->active))
436 deactivate_super(sb);
437 }
438 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
439
440 /*
441 * Deliver file system statistics to userspace
442 */
443 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
444 {
445 struct nfs_server *server = NFS_SB(dentry->d_sb);
446 unsigned char blockbits;
447 unsigned long blockres;
448 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
449 struct nfs_fsstat res;
450 int error = -ENOMEM;
451
452 res.fattr = nfs_alloc_fattr();
453 if (res.fattr == NULL)
454 goto out_err;
455
456 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
457 if (unlikely(error == -ESTALE)) {
458 struct dentry *pd_dentry;
459
460 pd_dentry = dget_parent(dentry);
461 nfs_zap_caches(d_inode(pd_dentry));
462 dput(pd_dentry);
463 }
464 nfs_free_fattr(res.fattr);
465 if (error < 0)
466 goto out_err;
467
468 buf->f_type = NFS_SUPER_MAGIC;
469
470 /*
471 * Current versions of glibc do not correctly handle the
472 * case where f_frsize != f_bsize. Eventually we want to
473 * report the value of wtmult in this field.
474 */
475 buf->f_frsize = dentry->d_sb->s_blocksize;
476
477 /*
478 * On most *nix systems, f_blocks, f_bfree, and f_bavail
479 * are reported in units of f_frsize. Linux hasn't had
480 * an f_frsize field in its statfs struct until recently,
481 * thus historically Linux's sys_statfs reports these
482 * fields in units of f_bsize.
483 */
484 buf->f_bsize = dentry->d_sb->s_blocksize;
485 blockbits = dentry->d_sb->s_blocksize_bits;
486 blockres = (1 << blockbits) - 1;
487 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
488 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
489 buf->f_bavail = (res.abytes + blockres) >> blockbits;
490
491 buf->f_files = res.tfiles;
492 buf->f_ffree = res.afiles;
493
494 buf->f_namelen = server->namelen;
495
496 return 0;
497
498 out_err:
499 dprintk("%s: statfs error = %d\n", __func__, -error);
500 return error;
501 }
502 EXPORT_SYMBOL_GPL(nfs_statfs);
503
504 /*
505 * Map the security flavour number to a name
506 */
507 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
508 {
509 static const struct {
510 rpc_authflavor_t flavour;
511 const char *str;
512 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
513 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
514 { RPC_AUTH_NULL, "null" },
515 { RPC_AUTH_UNIX, "sys" },
516 { RPC_AUTH_GSS_KRB5, "krb5" },
517 { RPC_AUTH_GSS_KRB5I, "krb5i" },
518 { RPC_AUTH_GSS_KRB5P, "krb5p" },
519 { RPC_AUTH_GSS_LKEY, "lkey" },
520 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
521 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
522 { RPC_AUTH_GSS_SPKM, "spkm" },
523 { RPC_AUTH_GSS_SPKMI, "spkmi" },
524 { RPC_AUTH_GSS_SPKMP, "spkmp" },
525 { UINT_MAX, "unknown" }
526 };
527 int i;
528
529 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
530 if (sec_flavours[i].flavour == flavour)
531 break;
532 }
533 return sec_flavours[i].str;
534 }
535
536 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
537 int showdefaults)
538 {
539 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
540 char *proto = NULL;
541
542 switch (sap->sa_family) {
543 case AF_INET:
544 switch (nfss->mountd_protocol) {
545 case IPPROTO_UDP:
546 proto = RPCBIND_NETID_UDP;
547 break;
548 case IPPROTO_TCP:
549 proto = RPCBIND_NETID_TCP;
550 break;
551 }
552 break;
553 case AF_INET6:
554 switch (nfss->mountd_protocol) {
555 case IPPROTO_UDP:
556 proto = RPCBIND_NETID_UDP6;
557 break;
558 case IPPROTO_TCP:
559 proto = RPCBIND_NETID_TCP6;
560 break;
561 }
562 break;
563 }
564 if (proto || showdefaults)
565 seq_printf(m, ",mountproto=%s", proto ?: "auto");
566 }
567
568 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
569 int showdefaults)
570 {
571 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
572
573 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
574 return;
575
576 switch (sap->sa_family) {
577 case AF_INET: {
578 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
579 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
580 break;
581 }
582 case AF_INET6: {
583 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
584 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
585 break;
586 }
587 default:
588 if (showdefaults)
589 seq_puts(m, ",mountaddr=unspecified");
590 }
591
592 if (nfss->mountd_version || showdefaults)
593 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
594 if ((nfss->mountd_port &&
595 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
596 showdefaults)
597 seq_printf(m, ",mountport=%u", nfss->mountd_port);
598
599 nfs_show_mountd_netid(m, nfss, showdefaults);
600 }
601
602 #if IS_ENABLED(CONFIG_NFS_V4)
603 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
604 int showdefaults)
605 {
606 struct nfs_client *clp = nfss->nfs_client;
607
608 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
609 }
610 #else
611 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
612 int showdefaults)
613 {
614 }
615 #endif
616
617 static void nfs_show_nfs_version(struct seq_file *m,
618 unsigned int version,
619 unsigned int minorversion)
620 {
621 seq_printf(m, ",vers=%u", version);
622 if (version == 4)
623 seq_printf(m, ".%u", minorversion);
624 }
625
626 /*
627 * Describe the mount options in force on this server representation
628 */
629 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
630 int showdefaults)
631 {
632 static const struct proc_nfs_info {
633 int flag;
634 const char *str;
635 const char *nostr;
636 } nfs_info[] = {
637 { NFS_MOUNT_SOFT, ",soft", "" },
638 { NFS_MOUNT_SOFTERR, ",softerr", "" },
639 { NFS_MOUNT_POSIX, ",posix", "" },
640 { NFS_MOUNT_NOCTO, ",nocto", "" },
641 { NFS_MOUNT_NOAC, ",noac", "" },
642 { NFS_MOUNT_NONLM, ",nolock", "" },
643 { NFS_MOUNT_NOACL, ",noacl", "" },
644 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
645 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
646 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
647 { 0, NULL, NULL }
648 };
649 const struct proc_nfs_info *nfs_infop;
650 struct nfs_client *clp = nfss->nfs_client;
651 u32 version = clp->rpc_ops->version;
652 int local_flock, local_fcntl;
653
654 nfs_show_nfs_version(m, version, clp->cl_minorversion);
655 seq_printf(m, ",rsize=%u", nfss->rsize);
656 seq_printf(m, ",wsize=%u", nfss->wsize);
657 if (nfss->bsize != 0)
658 seq_printf(m, ",bsize=%u", nfss->bsize);
659 seq_printf(m, ",namlen=%u", nfss->namelen);
660 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
661 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
662 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
663 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
664 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
665 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
666 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
667 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
668 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
669 seq_puts(m, ",hard");
670 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
671 if (nfss->flags & nfs_infop->flag)
672 seq_puts(m, nfs_infop->str);
673 else
674 seq_puts(m, nfs_infop->nostr);
675 }
676 rcu_read_lock();
677 seq_printf(m, ",proto=%s",
678 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
679 rcu_read_unlock();
680 if (clp->cl_nconnect > 0)
681 seq_printf(m, ",nconnect=%u", clp->cl_nconnect);
682 if (version == 4) {
683 if (nfss->port != NFS_PORT)
684 seq_printf(m, ",port=%u", nfss->port);
685 } else
686 if (nfss->port)
687 seq_printf(m, ",port=%u", nfss->port);
688
689 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
690 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
691 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
692
693 if (version != 4)
694 nfs_show_mountd_options(m, nfss, showdefaults);
695 else
696 nfs_show_nfsv4_options(m, nfss, showdefaults);
697
698 if (nfss->options & NFS_OPTION_FSCACHE)
699 seq_puts(m, ",fsc");
700
701 if (nfss->options & NFS_OPTION_MIGRATION)
702 seq_puts(m, ",migration");
703
704 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
705 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
706 seq_puts(m, ",lookupcache=none");
707 else
708 seq_puts(m, ",lookupcache=pos");
709 }
710
711 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
712 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
713
714 if (!local_flock && !local_fcntl)
715 seq_puts(m, ",local_lock=none");
716 else if (local_flock && local_fcntl)
717 seq_puts(m, ",local_lock=all");
718 else if (local_flock)
719 seq_puts(m, ",local_lock=flock");
720 else
721 seq_puts(m, ",local_lock=posix");
722 }
723
724 /*
725 * Describe the mount options on this VFS mountpoint
726 */
727 int nfs_show_options(struct seq_file *m, struct dentry *root)
728 {
729 struct nfs_server *nfss = NFS_SB(root->d_sb);
730
731 nfs_show_mount_options(m, nfss, 0);
732
733 rcu_read_lock();
734 seq_printf(m, ",addr=%s",
735 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
736 RPC_DISPLAY_ADDR));
737 rcu_read_unlock();
738
739 return 0;
740 }
741 EXPORT_SYMBOL_GPL(nfs_show_options);
742
743 #if IS_ENABLED(CONFIG_NFS_V4)
744 static void show_lease(struct seq_file *m, struct nfs_server *server)
745 {
746 struct nfs_client *clp = server->nfs_client;
747 unsigned long expire;
748
749 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ);
750 expire = clp->cl_last_renewal + clp->cl_lease_time;
751 seq_printf(m, ",lease_expired=%ld",
752 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ);
753 }
754 #ifdef CONFIG_NFS_V4_1
755 static void show_sessions(struct seq_file *m, struct nfs_server *server)
756 {
757 if (nfs4_has_session(server->nfs_client))
758 seq_puts(m, ",sessions");
759 }
760 #else
761 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
762 #endif
763 #endif
764
765 #ifdef CONFIG_NFS_V4_1
766 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
767 {
768 seq_printf(m, ",pnfs=");
769 if (server->pnfs_curr_ld)
770 seq_printf(m, "%s", server->pnfs_curr_ld->name);
771 else
772 seq_printf(m, "not configured");
773 }
774
775 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
776 {
777 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
778 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
779 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
780 "date='%llu,%u'",
781 impl_id->name, impl_id->domain,
782 impl_id->date.seconds, impl_id->date.nseconds);
783 }
784 }
785 #else
786 #if IS_ENABLED(CONFIG_NFS_V4)
787 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
788 {
789 }
790 #endif
791 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
792 {
793 }
794 #endif
795
796 int nfs_show_devname(struct seq_file *m, struct dentry *root)
797 {
798 char *page = (char *) __get_free_page(GFP_KERNEL);
799 char *devname, *dummy;
800 int err = 0;
801 if (!page)
802 return -ENOMEM;
803 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
804 if (IS_ERR(devname))
805 err = PTR_ERR(devname);
806 else
807 seq_escape(m, devname, " \t\n\\");
808 free_page((unsigned long)page);
809 return err;
810 }
811 EXPORT_SYMBOL_GPL(nfs_show_devname);
812
813 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
814 {
815 seq_puts(m, "/");
816 return 0;
817 }
818 EXPORT_SYMBOL_GPL(nfs_show_path);
819
820 /*
821 * Present statistical information for this VFS mountpoint
822 */
823 int nfs_show_stats(struct seq_file *m, struct dentry *root)
824 {
825 int i, cpu;
826 struct nfs_server *nfss = NFS_SB(root->d_sb);
827 struct rpc_auth *auth = nfss->client->cl_auth;
828 struct nfs_iostats totals = { };
829
830 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
831
832 /*
833 * Display all mount option settings
834 */
835 seq_puts(m, "\n\topts:\t");
836 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
837 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
838 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
839 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
840 nfs_show_mount_options(m, nfss, 1);
841
842 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
843
844 show_implementation_id(m, nfss);
845
846 seq_puts(m, "\n\tcaps:\t");
847 seq_printf(m, "caps=0x%x", nfss->caps);
848 seq_printf(m, ",wtmult=%u", nfss->wtmult);
849 seq_printf(m, ",dtsize=%u", nfss->dtsize);
850 seq_printf(m, ",bsize=%u", nfss->bsize);
851 seq_printf(m, ",namlen=%u", nfss->namelen);
852
853 #if IS_ENABLED(CONFIG_NFS_V4)
854 if (nfss->nfs_client->rpc_ops->version == 4) {
855 seq_puts(m, "\n\tnfsv4:\t");
856 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
857 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
858 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
859 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
860 show_sessions(m, nfss);
861 show_pnfs(m, nfss);
862 show_lease(m, nfss);
863 }
864 #endif
865
866 /*
867 * Display security flavor in effect for this mount
868 */
869 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
870 if (auth->au_flavor)
871 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
872
873 /*
874 * Display superblock I/O counters
875 */
876 for_each_possible_cpu(cpu) {
877 struct nfs_iostats *stats;
878
879 preempt_disable();
880 stats = per_cpu_ptr(nfss->io_stats, cpu);
881
882 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
883 totals.events[i] += stats->events[i];
884 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
885 totals.bytes[i] += stats->bytes[i];
886 #ifdef CONFIG_NFS_FSCACHE
887 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
888 totals.fscache[i] += stats->fscache[i];
889 #endif
890
891 preempt_enable();
892 }
893
894 seq_puts(m, "\n\tevents:\t");
895 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
896 seq_printf(m, "%lu ", totals.events[i]);
897 seq_puts(m, "\n\tbytes:\t");
898 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
899 seq_printf(m, "%Lu ", totals.bytes[i]);
900 #ifdef CONFIG_NFS_FSCACHE
901 if (nfss->options & NFS_OPTION_FSCACHE) {
902 seq_puts(m, "\n\tfsc:\t");
903 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
904 seq_printf(m, "%Lu ", totals.fscache[i]);
905 }
906 #endif
907 seq_putc(m, '\n');
908
909 rpc_clnt_show_stats(m, nfss->client);
910
911 return 0;
912 }
913 EXPORT_SYMBOL_GPL(nfs_show_stats);
914
915 /*
916 * Begin unmount by attempting to remove all automounted mountpoints we added
917 * in response to xdev traversals and referrals
918 */
919 void nfs_umount_begin(struct super_block *sb)
920 {
921 struct nfs_server *server;
922 struct rpc_clnt *rpc;
923
924 server = NFS_SB(sb);
925 /* -EIO all pending I/O */
926 rpc = server->client_acl;
927 if (!IS_ERR(rpc))
928 rpc_killall_tasks(rpc);
929 rpc = server->client;
930 if (!IS_ERR(rpc))
931 rpc_killall_tasks(rpc);
932 }
933 EXPORT_SYMBOL_GPL(nfs_umount_begin);
934
935 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
936 {
937 struct nfs_parsed_mount_data *data;
938
939 data = kzalloc(sizeof(*data), GFP_KERNEL);
940 if (data) {
941 data->timeo = NFS_UNSPEC_TIMEO;
942 data->retrans = NFS_UNSPEC_RETRANS;
943 data->acregmin = NFS_DEF_ACREGMIN;
944 data->acregmax = NFS_DEF_ACREGMAX;
945 data->acdirmin = NFS_DEF_ACDIRMIN;
946 data->acdirmax = NFS_DEF_ACDIRMAX;
947 data->mount_server.port = NFS_UNSPEC_PORT;
948 data->nfs_server.port = NFS_UNSPEC_PORT;
949 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
950 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
951 data->minorversion = 0;
952 data->need_mount = true;
953 data->net = current->nsproxy->net_ns;
954 data->lsm_opts = NULL;
955 }
956 return data;
957 }
958
959 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
960 {
961 if (data) {
962 kfree(data->client_address);
963 kfree(data->mount_server.hostname);
964 kfree(data->nfs_server.export_path);
965 kfree(data->nfs_server.hostname);
966 kfree(data->fscache_uniq);
967 security_free_mnt_opts(&data->lsm_opts);
968 kfree(data);
969 }
970 }
971
972 /*
973 * Sanity-check a server address provided by the mount command.
974 *
975 * Address family must be initialized, and address must not be
976 * the ANY address for that family.
977 */
978 static int nfs_verify_server_address(struct sockaddr *addr)
979 {
980 switch (addr->sa_family) {
981 case AF_INET: {
982 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
983 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
984 }
985 case AF_INET6: {
986 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
987 return !ipv6_addr_any(sa);
988 }
989 }
990
991 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
992 return 0;
993 }
994
995 /*
996 * Select between a default port value and a user-specified port value.
997 * If a zero value is set, then autobind will be used.
998 */
999 static void nfs_set_port(struct sockaddr *sap, int *port,
1000 const unsigned short default_port)
1001 {
1002 if (*port == NFS_UNSPEC_PORT)
1003 *port = default_port;
1004
1005 rpc_set_port(sap, *port);
1006 }
1007
1008 /*
1009 * Sanity check the NFS transport protocol.
1010 *
1011 */
1012 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1013 {
1014 switch (mnt->nfs_server.protocol) {
1015 case XPRT_TRANSPORT_UDP:
1016 case XPRT_TRANSPORT_TCP:
1017 case XPRT_TRANSPORT_RDMA:
1018 break;
1019 default:
1020 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1021 }
1022 }
1023
1024 /*
1025 * For text based NFSv2/v3 mounts, the mount protocol transport default
1026 * settings should depend upon the specified NFS transport.
1027 */
1028 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1029 {
1030 nfs_validate_transport_protocol(mnt);
1031
1032 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1033 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1034 return;
1035 switch (mnt->nfs_server.protocol) {
1036 case XPRT_TRANSPORT_UDP:
1037 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1038 break;
1039 case XPRT_TRANSPORT_TCP:
1040 case XPRT_TRANSPORT_RDMA:
1041 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1042 }
1043 }
1044
1045 /*
1046 * Add 'flavor' to 'auth_info' if not already present.
1047 * Returns true if 'flavor' ends up in the list, false otherwise
1048 */
1049 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1050 rpc_authflavor_t flavor)
1051 {
1052 unsigned int i;
1053 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1054
1055 /* make sure this flavor isn't already in the list */
1056 for (i = 0; i < auth_info->flavor_len; i++) {
1057 if (flavor == auth_info->flavors[i])
1058 return true;
1059 }
1060
1061 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1062 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1063 return false;
1064 }
1065
1066 auth_info->flavors[auth_info->flavor_len++] = flavor;
1067 return true;
1068 }
1069
1070 /*
1071 * Return true if 'match' is in auth_info or auth_info is empty.
1072 * Return false otherwise.
1073 */
1074 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1075 rpc_authflavor_t match)
1076 {
1077 int i;
1078
1079 if (!auth_info->flavor_len)
1080 return true;
1081
1082 for (i = 0; i < auth_info->flavor_len; i++) {
1083 if (auth_info->flavors[i] == match)
1084 return true;
1085 }
1086 return false;
1087 }
1088 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1089
1090 /*
1091 * Parse the value of the 'sec=' option.
1092 */
1093 static int nfs_parse_security_flavors(char *value,
1094 struct nfs_parsed_mount_data *mnt)
1095 {
1096 substring_t args[MAX_OPT_ARGS];
1097 rpc_authflavor_t pseudoflavor;
1098 char *p;
1099
1100 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1101
1102 while ((p = strsep(&value, ":")) != NULL) {
1103 switch (match_token(p, nfs_secflavor_tokens, args)) {
1104 case Opt_sec_none:
1105 pseudoflavor = RPC_AUTH_NULL;
1106 break;
1107 case Opt_sec_sys:
1108 pseudoflavor = RPC_AUTH_UNIX;
1109 break;
1110 case Opt_sec_krb5:
1111 pseudoflavor = RPC_AUTH_GSS_KRB5;
1112 break;
1113 case Opt_sec_krb5i:
1114 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1115 break;
1116 case Opt_sec_krb5p:
1117 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1118 break;
1119 case Opt_sec_lkey:
1120 pseudoflavor = RPC_AUTH_GSS_LKEY;
1121 break;
1122 case Opt_sec_lkeyi:
1123 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1124 break;
1125 case Opt_sec_lkeyp:
1126 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1127 break;
1128 case Opt_sec_spkm:
1129 pseudoflavor = RPC_AUTH_GSS_SPKM;
1130 break;
1131 case Opt_sec_spkmi:
1132 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1133 break;
1134 case Opt_sec_spkmp:
1135 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1136 break;
1137 default:
1138 dfprintk(MOUNT,
1139 "NFS: sec= option '%s' not recognized\n", p);
1140 return 0;
1141 }
1142
1143 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1144 return 0;
1145 }
1146
1147 return 1;
1148 }
1149
1150 static int nfs_parse_version_string(char *string,
1151 struct nfs_parsed_mount_data *mnt,
1152 substring_t *args)
1153 {
1154 mnt->flags &= ~NFS_MOUNT_VER3;
1155 switch (match_token(string, nfs_vers_tokens, args)) {
1156 case Opt_vers_2:
1157 mnt->version = 2;
1158 break;
1159 case Opt_vers_3:
1160 mnt->flags |= NFS_MOUNT_VER3;
1161 mnt->version = 3;
1162 break;
1163 case Opt_vers_4:
1164 /* Backward compatibility option. In future,
1165 * the mount program should always supply
1166 * a NFSv4 minor version number.
1167 */
1168 mnt->version = 4;
1169 break;
1170 case Opt_vers_4_0:
1171 mnt->version = 4;
1172 mnt->minorversion = 0;
1173 break;
1174 case Opt_vers_4_1:
1175 mnt->version = 4;
1176 mnt->minorversion = 1;
1177 break;
1178 case Opt_vers_4_2:
1179 mnt->version = 4;
1180 mnt->minorversion = 2;
1181 break;
1182 default:
1183 return 0;
1184 }
1185 return 1;
1186 }
1187
1188 static int nfs_get_option_str(substring_t args[], char **option)
1189 {
1190 kfree(*option);
1191 *option = match_strdup(args);
1192 return !*option;
1193 }
1194
1195 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1196 {
1197 int rc;
1198 char *string;
1199
1200 string = match_strdup(args);
1201 if (string == NULL)
1202 return -ENOMEM;
1203 rc = kstrtoul(string, 10, option);
1204 kfree(string);
1205
1206 return rc;
1207 }
1208
1209 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
1210 unsigned long l_bound, unsigned long u_bound)
1211 {
1212 int ret;
1213
1214 ret = nfs_get_option_ul(args, option);
1215 if (ret != 0)
1216 return ret;
1217 if (*option < l_bound || *option > u_bound)
1218 return -ERANGE;
1219 return 0;
1220 }
1221
1222 /*
1223 * Error-check and convert a string of mount options from user space into
1224 * a data structure. The whole mount string is processed; bad options are
1225 * skipped as they are encountered. If there were no errors, return 1;
1226 * otherwise return 0 (zero).
1227 */
1228 static int nfs_parse_mount_options(char *raw,
1229 struct nfs_parsed_mount_data *mnt)
1230 {
1231 char *p, *string;
1232 int rc, sloppy = 0, invalid_option = 0;
1233 unsigned short protofamily = AF_UNSPEC;
1234 unsigned short mountfamily = AF_UNSPEC;
1235
1236 if (!raw) {
1237 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1238 return 1;
1239 }
1240 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1241
1242 rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
1243 if (rc)
1244 goto out_security_failure;
1245
1246 while ((p = strsep(&raw, ",")) != NULL) {
1247 substring_t args[MAX_OPT_ARGS];
1248 unsigned long option;
1249 int token;
1250
1251 if (!*p)
1252 continue;
1253
1254 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1255
1256 token = match_token(p, nfs_mount_option_tokens, args);
1257 switch (token) {
1258
1259 /*
1260 * boolean options: foo/nofoo
1261 */
1262 case Opt_soft:
1263 mnt->flags |= NFS_MOUNT_SOFT;
1264 mnt->flags &= ~NFS_MOUNT_SOFTERR;
1265 break;
1266 case Opt_softerr:
1267 mnt->flags |= NFS_MOUNT_SOFTERR;
1268 mnt->flags &= ~NFS_MOUNT_SOFT;
1269 break;
1270 case Opt_hard:
1271 mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
1272 break;
1273 case Opt_posix:
1274 mnt->flags |= NFS_MOUNT_POSIX;
1275 break;
1276 case Opt_noposix:
1277 mnt->flags &= ~NFS_MOUNT_POSIX;
1278 break;
1279 case Opt_cto:
1280 mnt->flags &= ~NFS_MOUNT_NOCTO;
1281 break;
1282 case Opt_nocto:
1283 mnt->flags |= NFS_MOUNT_NOCTO;
1284 break;
1285 case Opt_ac:
1286 mnt->flags &= ~NFS_MOUNT_NOAC;
1287 break;
1288 case Opt_noac:
1289 mnt->flags |= NFS_MOUNT_NOAC;
1290 break;
1291 case Opt_lock:
1292 mnt->flags &= ~NFS_MOUNT_NONLM;
1293 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1294 NFS_MOUNT_LOCAL_FCNTL);
1295 break;
1296 case Opt_nolock:
1297 mnt->flags |= NFS_MOUNT_NONLM;
1298 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1299 NFS_MOUNT_LOCAL_FCNTL);
1300 break;
1301 case Opt_udp:
1302 mnt->flags &= ~NFS_MOUNT_TCP;
1303 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1304 break;
1305 case Opt_tcp:
1306 mnt->flags |= NFS_MOUNT_TCP;
1307 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1308 break;
1309 case Opt_rdma:
1310 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1311 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1312 xprt_load_transport(p);
1313 break;
1314 case Opt_acl:
1315 mnt->flags &= ~NFS_MOUNT_NOACL;
1316 break;
1317 case Opt_noacl:
1318 mnt->flags |= NFS_MOUNT_NOACL;
1319 break;
1320 case Opt_rdirplus:
1321 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1322 break;
1323 case Opt_nordirplus:
1324 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1325 break;
1326 case Opt_sharecache:
1327 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1328 break;
1329 case Opt_nosharecache:
1330 mnt->flags |= NFS_MOUNT_UNSHARED;
1331 break;
1332 case Opt_resvport:
1333 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1334 break;
1335 case Opt_noresvport:
1336 mnt->flags |= NFS_MOUNT_NORESVPORT;
1337 break;
1338 case Opt_fscache:
1339 mnt->options |= NFS_OPTION_FSCACHE;
1340 kfree(mnt->fscache_uniq);
1341 mnt->fscache_uniq = NULL;
1342 break;
1343 case Opt_nofscache:
1344 mnt->options &= ~NFS_OPTION_FSCACHE;
1345 kfree(mnt->fscache_uniq);
1346 mnt->fscache_uniq = NULL;
1347 break;
1348 case Opt_migration:
1349 mnt->options |= NFS_OPTION_MIGRATION;
1350 break;
1351 case Opt_nomigration:
1352 mnt->options &= ~NFS_OPTION_MIGRATION;
1353 break;
1354
1355 /*
1356 * options that take numeric values
1357 */
1358 case Opt_port:
1359 if (nfs_get_option_ul(args, &option) ||
1360 option > USHRT_MAX)
1361 goto out_invalid_value;
1362 mnt->nfs_server.port = option;
1363 break;
1364 case Opt_rsize:
1365 if (nfs_get_option_ul(args, &option))
1366 goto out_invalid_value;
1367 mnt->rsize = option;
1368 break;
1369 case Opt_wsize:
1370 if (nfs_get_option_ul(args, &option))
1371 goto out_invalid_value;
1372 mnt->wsize = option;
1373 break;
1374 case Opt_bsize:
1375 if (nfs_get_option_ul(args, &option))
1376 goto out_invalid_value;
1377 mnt->bsize = option;
1378 break;
1379 case Opt_timeo:
1380 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
1381 goto out_invalid_value;
1382 mnt->timeo = option;
1383 break;
1384 case Opt_retrans:
1385 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
1386 goto out_invalid_value;
1387 mnt->retrans = option;
1388 break;
1389 case Opt_acregmin:
1390 if (nfs_get_option_ul(args, &option))
1391 goto out_invalid_value;
1392 mnt->acregmin = option;
1393 break;
1394 case Opt_acregmax:
1395 if (nfs_get_option_ul(args, &option))
1396 goto out_invalid_value;
1397 mnt->acregmax = option;
1398 break;
1399 case Opt_acdirmin:
1400 if (nfs_get_option_ul(args, &option))
1401 goto out_invalid_value;
1402 mnt->acdirmin = option;
1403 break;
1404 case Opt_acdirmax:
1405 if (nfs_get_option_ul(args, &option))
1406 goto out_invalid_value;
1407 mnt->acdirmax = option;
1408 break;
1409 case Opt_actimeo:
1410 if (nfs_get_option_ul(args, &option))
1411 goto out_invalid_value;
1412 mnt->acregmin = mnt->acregmax =
1413 mnt->acdirmin = mnt->acdirmax = option;
1414 break;
1415 case Opt_namelen:
1416 if (nfs_get_option_ul(args, &option))
1417 goto out_invalid_value;
1418 mnt->namlen = option;
1419 break;
1420 case Opt_mountport:
1421 if (nfs_get_option_ul(args, &option) ||
1422 option > USHRT_MAX)
1423 goto out_invalid_value;
1424 mnt->mount_server.port = option;
1425 break;
1426 case Opt_mountvers:
1427 if (nfs_get_option_ul(args, &option) ||
1428 option < NFS_MNT_VERSION ||
1429 option > NFS_MNT3_VERSION)
1430 goto out_invalid_value;
1431 mnt->mount_server.version = option;
1432 break;
1433 case Opt_minorversion:
1434 if (nfs_get_option_ul(args, &option))
1435 goto out_invalid_value;
1436 if (option > NFS4_MAX_MINOR_VERSION)
1437 goto out_invalid_value;
1438 mnt->minorversion = option;
1439 break;
1440
1441 /*
1442 * options that take text values
1443 */
1444 case Opt_nfsvers:
1445 string = match_strdup(args);
1446 if (string == NULL)
1447 goto out_nomem;
1448 rc = nfs_parse_version_string(string, mnt, args);
1449 kfree(string);
1450 if (!rc)
1451 goto out_invalid_value;
1452 break;
1453 case Opt_sec:
1454 string = match_strdup(args);
1455 if (string == NULL)
1456 goto out_nomem;
1457 rc = nfs_parse_security_flavors(string, mnt);
1458 kfree(string);
1459 if (!rc) {
1460 dfprintk(MOUNT, "NFS: unrecognized "
1461 "security flavor\n");
1462 return 0;
1463 }
1464 break;
1465 case Opt_proto:
1466 string = match_strdup(args);
1467 if (string == NULL)
1468 goto out_nomem;
1469 token = match_token(string,
1470 nfs_xprt_protocol_tokens, args);
1471
1472 protofamily = AF_INET;
1473 switch (token) {
1474 case Opt_xprt_udp6:
1475 protofamily = AF_INET6;
1476 /* fall through */
1477 case Opt_xprt_udp:
1478 mnt->flags &= ~NFS_MOUNT_TCP;
1479 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1480 break;
1481 case Opt_xprt_tcp6:
1482 protofamily = AF_INET6;
1483 /* fall through */
1484 case Opt_xprt_tcp:
1485 mnt->flags |= NFS_MOUNT_TCP;
1486 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1487 break;
1488 case Opt_xprt_rdma6:
1489 protofamily = AF_INET6;
1490 /* fall through */
1491 case Opt_xprt_rdma:
1492 /* vector side protocols to TCP */
1493 mnt->flags |= NFS_MOUNT_TCP;
1494 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1495 xprt_load_transport(string);
1496 break;
1497 default:
1498 dfprintk(MOUNT, "NFS: unrecognized "
1499 "transport protocol\n");
1500 kfree(string);
1501 return 0;
1502 }
1503 kfree(string);
1504 break;
1505 case Opt_mountproto:
1506 string = match_strdup(args);
1507 if (string == NULL)
1508 goto out_nomem;
1509 token = match_token(string,
1510 nfs_xprt_protocol_tokens, args);
1511 kfree(string);
1512
1513 mountfamily = AF_INET;
1514 switch (token) {
1515 case Opt_xprt_udp6:
1516 mountfamily = AF_INET6;
1517 /* fall through */
1518 case Opt_xprt_udp:
1519 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1520 break;
1521 case Opt_xprt_tcp6:
1522 mountfamily = AF_INET6;
1523 /* fall through */
1524 case Opt_xprt_tcp:
1525 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1526 break;
1527 case Opt_xprt_rdma: /* not used for side protocols */
1528 default:
1529 dfprintk(MOUNT, "NFS: unrecognized "
1530 "transport protocol\n");
1531 return 0;
1532 }
1533 break;
1534 case Opt_addr:
1535 string = match_strdup(args);
1536 if (string == NULL)
1537 goto out_nomem;
1538 mnt->nfs_server.addrlen =
1539 rpc_pton(mnt->net, string, strlen(string),
1540 (struct sockaddr *)
1541 &mnt->nfs_server.address,
1542 sizeof(mnt->nfs_server.address));
1543 kfree(string);
1544 if (mnt->nfs_server.addrlen == 0)
1545 goto out_invalid_address;
1546 break;
1547 case Opt_clientaddr:
1548 if (nfs_get_option_str(args, &mnt->client_address))
1549 goto out_nomem;
1550 break;
1551 case Opt_mounthost:
1552 if (nfs_get_option_str(args,
1553 &mnt->mount_server.hostname))
1554 goto out_nomem;
1555 break;
1556 case Opt_mountaddr:
1557 string = match_strdup(args);
1558 if (string == NULL)
1559 goto out_nomem;
1560 mnt->mount_server.addrlen =
1561 rpc_pton(mnt->net, string, strlen(string),
1562 (struct sockaddr *)
1563 &mnt->mount_server.address,
1564 sizeof(mnt->mount_server.address));
1565 kfree(string);
1566 if (mnt->mount_server.addrlen == 0)
1567 goto out_invalid_address;
1568 break;
1569 case Opt_nconnect:
1570 if (nfs_get_option_ul_bound(args, &option, 1, NFS_MAX_CONNECTIONS))
1571 goto out_invalid_value;
1572 mnt->nfs_server.nconnect = option;
1573 break;
1574 case Opt_lookupcache:
1575 string = match_strdup(args);
1576 if (string == NULL)
1577 goto out_nomem;
1578 token = match_token(string,
1579 nfs_lookupcache_tokens, args);
1580 kfree(string);
1581 switch (token) {
1582 case Opt_lookupcache_all:
1583 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1584 break;
1585 case Opt_lookupcache_positive:
1586 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1587 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1588 break;
1589 case Opt_lookupcache_none:
1590 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1591 break;
1592 default:
1593 dfprintk(MOUNT, "NFS: invalid "
1594 "lookupcache argument\n");
1595 return 0;
1596 }
1597 break;
1598 case Opt_fscache_uniq:
1599 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1600 goto out_nomem;
1601 mnt->options |= NFS_OPTION_FSCACHE;
1602 break;
1603 case Opt_local_lock:
1604 string = match_strdup(args);
1605 if (string == NULL)
1606 goto out_nomem;
1607 token = match_token(string, nfs_local_lock_tokens,
1608 args);
1609 kfree(string);
1610 switch (token) {
1611 case Opt_local_lock_all:
1612 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1613 NFS_MOUNT_LOCAL_FCNTL);
1614 break;
1615 case Opt_local_lock_flock:
1616 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1617 break;
1618 case Opt_local_lock_posix:
1619 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1620 break;
1621 case Opt_local_lock_none:
1622 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1623 NFS_MOUNT_LOCAL_FCNTL);
1624 break;
1625 default:
1626 dfprintk(MOUNT, "NFS: invalid "
1627 "local_lock argument\n");
1628 return 0;
1629 }
1630 break;
1631
1632 /*
1633 * Special options
1634 */
1635 case Opt_sloppy:
1636 sloppy = 1;
1637 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1638 break;
1639 case Opt_userspace:
1640 case Opt_deprecated:
1641 dfprintk(MOUNT, "NFS: ignoring mount option "
1642 "'%s'\n", p);
1643 break;
1644
1645 default:
1646 invalid_option = 1;
1647 dfprintk(MOUNT, "NFS: unrecognized mount option "
1648 "'%s'\n", p);
1649 }
1650 }
1651
1652 if (!sloppy && invalid_option)
1653 return 0;
1654
1655 if (mnt->minorversion && mnt->version != 4)
1656 goto out_minorversion_mismatch;
1657
1658 if (mnt->options & NFS_OPTION_MIGRATION &&
1659 (mnt->version != 4 || mnt->minorversion != 0))
1660 goto out_migration_misuse;
1661
1662 /*
1663 * verify that any proto=/mountproto= options match the address
1664 * families in the addr=/mountaddr= options.
1665 */
1666 if (protofamily != AF_UNSPEC &&
1667 protofamily != mnt->nfs_server.address.ss_family)
1668 goto out_proto_mismatch;
1669
1670 if (mountfamily != AF_UNSPEC) {
1671 if (mnt->mount_server.addrlen) {
1672 if (mountfamily != mnt->mount_server.address.ss_family)
1673 goto out_mountproto_mismatch;
1674 } else {
1675 if (mountfamily != mnt->nfs_server.address.ss_family)
1676 goto out_mountproto_mismatch;
1677 }
1678 }
1679
1680 return 1;
1681
1682 out_mountproto_mismatch:
1683 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1684 "option\n");
1685 return 0;
1686 out_proto_mismatch:
1687 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1688 return 0;
1689 out_invalid_address:
1690 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1691 return 0;
1692 out_invalid_value:
1693 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1694 return 0;
1695 out_minorversion_mismatch:
1696 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1697 "minorversion=%u\n", mnt->version, mnt->minorversion);
1698 return 0;
1699 out_migration_misuse:
1700 printk(KERN_INFO
1701 "NFS: 'migration' not supported for this NFS version\n");
1702 return 0;
1703 out_nomem:
1704 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1705 return 0;
1706 out_security_failure:
1707 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1708 return 0;
1709 }
1710
1711 /*
1712 * Ensure that a specified authtype in args->auth_info is supported by
1713 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1714 * -EACCES if not.
1715 */
1716 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1717 rpc_authflavor_t *server_authlist, unsigned int count)
1718 {
1719 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1720 bool found_auth_null = false;
1721 unsigned int i;
1722
1723 /*
1724 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1725 * must be in the list returned by the server.
1726 *
1727 * AUTH_NULL has a special meaning when it's in the server list - it
1728 * means that the server will ignore the rpc creds, so any flavor
1729 * can be used but still use the sec= that was specified.
1730 *
1731 * Note also that the MNT procedure in MNTv1 does not return a list
1732 * of supported security flavors. In this case, nfs_mount() fabricates
1733 * a security flavor list containing just AUTH_NULL.
1734 */
1735 for (i = 0; i < count; i++) {
1736 flavor = server_authlist[i];
1737
1738 if (nfs_auth_info_match(&args->auth_info, flavor))
1739 goto out;
1740
1741 if (flavor == RPC_AUTH_NULL)
1742 found_auth_null = true;
1743 }
1744
1745 if (found_auth_null) {
1746 flavor = args->auth_info.flavors[0];
1747 goto out;
1748 }
1749
1750 dfprintk(MOUNT,
1751 "NFS: specified auth flavors not supported by server\n");
1752 return -EACCES;
1753
1754 out:
1755 args->selected_flavor = flavor;
1756 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1757 return 0;
1758 }
1759
1760 /*
1761 * Use the remote server's MOUNT service to request the NFS file handle
1762 * corresponding to the provided path.
1763 */
1764 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1765 struct nfs_fh *root_fh,
1766 rpc_authflavor_t *server_authlist,
1767 unsigned int *server_authlist_len)
1768 {
1769 struct nfs_mount_request request = {
1770 .sap = (struct sockaddr *)
1771 &args->mount_server.address,
1772 .dirpath = args->nfs_server.export_path,
1773 .protocol = args->mount_server.protocol,
1774 .fh = root_fh,
1775 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1776 .auth_flav_len = server_authlist_len,
1777 .auth_flavs = server_authlist,
1778 .net = args->net,
1779 };
1780 int status;
1781
1782 if (args->mount_server.version == 0) {
1783 switch (args->version) {
1784 default:
1785 args->mount_server.version = NFS_MNT3_VERSION;
1786 break;
1787 case 2:
1788 args->mount_server.version = NFS_MNT_VERSION;
1789 }
1790 }
1791 request.version = args->mount_server.version;
1792
1793 if (args->mount_server.hostname)
1794 request.hostname = args->mount_server.hostname;
1795 else
1796 request.hostname = args->nfs_server.hostname;
1797
1798 /*
1799 * Construct the mount server's address.
1800 */
1801 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1802 memcpy(request.sap, &args->nfs_server.address,
1803 args->nfs_server.addrlen);
1804 args->mount_server.addrlen = args->nfs_server.addrlen;
1805 }
1806 request.salen = args->mount_server.addrlen;
1807 nfs_set_port(request.sap, &args->mount_server.port, 0);
1808
1809 /*
1810 * Now ask the mount server to map our export path
1811 * to a file handle.
1812 */
1813 status = nfs_mount(&request);
1814 if (status != 0) {
1815 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1816 request.hostname, status);
1817 return status;
1818 }
1819
1820 return 0;
1821 }
1822
1823 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info)
1824 {
1825 int status;
1826 unsigned int i;
1827 bool tried_auth_unix = false;
1828 bool auth_null_in_list = false;
1829 struct nfs_server *server = ERR_PTR(-EACCES);
1830 struct nfs_parsed_mount_data *args = mount_info->parsed;
1831 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1832 unsigned int authlist_len = ARRAY_SIZE(authlist);
1833 struct nfs_subversion *nfs_mod = mount_info->nfs_mod;
1834
1835 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1836 &authlist_len);
1837 if (status)
1838 return ERR_PTR(status);
1839
1840 /*
1841 * Was a sec= authflavor specified in the options? First, verify
1842 * whether the server supports it, and then just try to use it if so.
1843 */
1844 if (args->auth_info.flavor_len > 0) {
1845 status = nfs_verify_authflavors(args, authlist, authlist_len);
1846 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1847 args->selected_flavor);
1848 if (status)
1849 return ERR_PTR(status);
1850 return nfs_mod->rpc_ops->create_server(mount_info);
1851 }
1852
1853 /*
1854 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1855 * SHOULD prefer the flavor listed first. However, some servers list
1856 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1857 */
1858 for (i = 0; i < authlist_len; ++i) {
1859 rpc_authflavor_t flavor;
1860 struct rpcsec_gss_info info;
1861
1862 flavor = authlist[i];
1863 switch (flavor) {
1864 case RPC_AUTH_UNIX:
1865 tried_auth_unix = true;
1866 break;
1867 case RPC_AUTH_NULL:
1868 auth_null_in_list = true;
1869 continue;
1870 default:
1871 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1872 continue;
1873 /* Fallthrough */
1874 }
1875 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1876 args->selected_flavor = flavor;
1877 server = nfs_mod->rpc_ops->create_server(mount_info);
1878 if (!IS_ERR(server))
1879 return server;
1880 }
1881
1882 /*
1883 * Nothing we tried so far worked. At this point, give up if we've
1884 * already tried AUTH_UNIX or if the server's list doesn't contain
1885 * AUTH_NULL
1886 */
1887 if (tried_auth_unix || !auth_null_in_list)
1888 return server;
1889
1890 /* Last chance! Try AUTH_UNIX */
1891 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1892 args->selected_flavor = RPC_AUTH_UNIX;
1893 return nfs_mod->rpc_ops->create_server(mount_info);
1894 }
1895
1896 static struct dentry *nfs_fs_mount_common(int, const char *, struct nfs_mount_info *);
1897
1898 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1899 struct nfs_mount_info *mount_info)
1900 {
1901 struct nfs_subversion *nfs_mod = mount_info->nfs_mod;
1902 if (mount_info->parsed->need_mount)
1903 mount_info->server = nfs_try_mount_request(mount_info);
1904 else
1905 mount_info->server = nfs_mod->rpc_ops->create_server(mount_info);
1906
1907 return nfs_fs_mount_common(flags, dev_name, mount_info);
1908 }
1909 EXPORT_SYMBOL_GPL(nfs_try_mount);
1910
1911 /*
1912 * Split "dev_name" into "hostname:export_path".
1913 *
1914 * The leftmost colon demarks the split between the server's hostname
1915 * and the export path. If the hostname starts with a left square
1916 * bracket, then it may contain colons.
1917 *
1918 * Note: caller frees hostname and export path, even on error.
1919 */
1920 static int nfs_parse_devname(const char *dev_name,
1921 char **hostname, size_t maxnamlen,
1922 char **export_path, size_t maxpathlen)
1923 {
1924 size_t len;
1925 char *end;
1926
1927 if (unlikely(!dev_name || !*dev_name)) {
1928 dfprintk(MOUNT, "NFS: device name not specified\n");
1929 return -EINVAL;
1930 }
1931
1932 /* Is the host name protected with square brakcets? */
1933 if (*dev_name == '[') {
1934 end = strchr(++dev_name, ']');
1935 if (end == NULL || end[1] != ':')
1936 goto out_bad_devname;
1937
1938 len = end - dev_name;
1939 end++;
1940 } else {
1941 char *comma;
1942
1943 end = strchr(dev_name, ':');
1944 if (end == NULL)
1945 goto out_bad_devname;
1946 len = end - dev_name;
1947
1948 /* kill possible hostname list: not supported */
1949 comma = strchr(dev_name, ',');
1950 if (comma != NULL && comma < end)
1951 len = comma - dev_name;
1952 }
1953
1954 if (len > maxnamlen)
1955 goto out_hostname;
1956
1957 /* N.B. caller will free nfs_server.hostname in all cases */
1958 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1959 if (*hostname == NULL)
1960 goto out_nomem;
1961 len = strlen(++end);
1962 if (len > maxpathlen)
1963 goto out_path;
1964 *export_path = kstrndup(end, len, GFP_KERNEL);
1965 if (!*export_path)
1966 goto out_nomem;
1967
1968 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1969 return 0;
1970
1971 out_bad_devname:
1972 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1973 return -EINVAL;
1974
1975 out_nomem:
1976 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1977 return -ENOMEM;
1978
1979 out_hostname:
1980 dfprintk(MOUNT, "NFS: server hostname too long\n");
1981 return -ENAMETOOLONG;
1982
1983 out_path:
1984 dfprintk(MOUNT, "NFS: export pathname too long\n");
1985 return -ENAMETOOLONG;
1986 }
1987
1988 /*
1989 * Validate the NFS2/NFS3 mount data
1990 * - fills in the mount root filehandle
1991 *
1992 * For option strings, user space handles the following behaviors:
1993 *
1994 * + DNS: mapping server host name to IP address ("addr=" option)
1995 *
1996 * + failure mode: how to behave if a mount request can't be handled
1997 * immediately ("fg/bg" option)
1998 *
1999 * + retry: how often to retry a mount request ("retry=" option)
2000 *
2001 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
2002 * mountproto=tcp after mountproto=udp, and so on
2003 */
2004 static int nfs23_validate_mount_data(void *options,
2005 struct nfs_parsed_mount_data *args,
2006 struct nfs_fh *mntfh,
2007 const char *dev_name)
2008 {
2009 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
2010 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2011 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
2012
2013 if (data == NULL)
2014 goto out_no_data;
2015
2016 args->version = NFS_DEFAULT_VERSION;
2017 switch (data->version) {
2018 case 1:
2019 data->namlen = 0; /* fall through */
2020 case 2:
2021 data->bsize = 0; /* fall through */
2022 case 3:
2023 if (data->flags & NFS_MOUNT_VER3)
2024 goto out_no_v3;
2025 data->root.size = NFS2_FHSIZE;
2026 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
2027 /* Turn off security negotiation */
2028 extra_flags |= NFS_MOUNT_SECFLAVOUR;
2029 /* fall through */
2030 case 4:
2031 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2032 goto out_no_sec;
2033 /* fall through */
2034 case 5:
2035 memset(data->context, 0, sizeof(data->context));
2036 /* fall through */
2037 case 6:
2038 if (data->flags & NFS_MOUNT_VER3) {
2039 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
2040 goto out_invalid_fh;
2041 mntfh->size = data->root.size;
2042 args->version = 3;
2043 } else {
2044 mntfh->size = NFS2_FHSIZE;
2045 args->version = 2;
2046 }
2047
2048
2049 memcpy(mntfh->data, data->root.data, mntfh->size);
2050 if (mntfh->size < sizeof(mntfh->data))
2051 memset(mntfh->data + mntfh->size, 0,
2052 sizeof(mntfh->data) - mntfh->size);
2053
2054 /*
2055 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2056 * can deal with.
2057 */
2058 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2059 args->flags |= extra_flags;
2060 args->rsize = data->rsize;
2061 args->wsize = data->wsize;
2062 args->timeo = data->timeo;
2063 args->retrans = data->retrans;
2064 args->acregmin = data->acregmin;
2065 args->acregmax = data->acregmax;
2066 args->acdirmin = data->acdirmin;
2067 args->acdirmax = data->acdirmax;
2068 args->need_mount = false;
2069
2070 memcpy(sap, &data->addr, sizeof(data->addr));
2071 args->nfs_server.addrlen = sizeof(data->addr);
2072 args->nfs_server.port = ntohs(data->addr.sin_port);
2073 if (sap->sa_family != AF_INET ||
2074 !nfs_verify_server_address(sap))
2075 goto out_no_address;
2076
2077 if (!(data->flags & NFS_MOUNT_TCP))
2078 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2079 /* N.B. caller will free nfs_server.hostname in all cases */
2080 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2081 args->namlen = data->namlen;
2082 args->bsize = data->bsize;
2083
2084 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2085 args->selected_flavor = data->pseudoflavor;
2086 else
2087 args->selected_flavor = RPC_AUTH_UNIX;
2088 if (!args->nfs_server.hostname)
2089 goto out_nomem;
2090
2091 if (!(data->flags & NFS_MOUNT_NONLM))
2092 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2093 NFS_MOUNT_LOCAL_FCNTL);
2094 else
2095 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2096 NFS_MOUNT_LOCAL_FCNTL);
2097 /*
2098 * The legacy version 6 binary mount data from userspace has a
2099 * field used only to transport selinux information into the
2100 * the kernel. To continue to support that functionality we
2101 * have a touch of selinux knowledge here in the NFS code. The
2102 * userspace code converted context=blah to just blah so we are
2103 * converting back to the full string selinux understands.
2104 */
2105 if (data->context[0]){
2106 #ifdef CONFIG_SECURITY_SELINUX
2107 int rc;
2108 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2109 rc = security_add_mnt_opt("context", data->context,
2110 strlen(data->context), &args->lsm_opts);
2111 if (rc)
2112 return rc;
2113 #else
2114 return -EINVAL;
2115 #endif
2116 }
2117
2118 break;
2119 default:
2120 return NFS_TEXT_DATA;
2121 }
2122
2123 return 0;
2124
2125 out_no_data:
2126 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2127 return -EINVAL;
2128
2129 out_no_v3:
2130 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2131 data->version);
2132 return -EINVAL;
2133
2134 out_no_sec:
2135 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2136 return -EINVAL;
2137
2138 out_nomem:
2139 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2140 return -ENOMEM;
2141
2142 out_no_address:
2143 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2144 return -EINVAL;
2145
2146 out_invalid_fh:
2147 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2148 return -EINVAL;
2149 }
2150
2151 #if IS_ENABLED(CONFIG_NFS_V4)
2152 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2153 void *options,
2154 struct nfs_parsed_mount_data *args,
2155 struct nfs_fh *mntfh,
2156 const char *dev_name)
2157 {
2158 if (fs_type == &nfs_fs_type)
2159 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2160 return nfs4_validate_mount_data(options, args, dev_name);
2161 }
2162 #else
2163 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2164 void *options,
2165 struct nfs_parsed_mount_data *args,
2166 struct nfs_fh *mntfh,
2167 const char *dev_name)
2168 {
2169 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2170 }
2171 #endif
2172
2173 static int nfs_validate_text_mount_data(void *options,
2174 struct nfs_parsed_mount_data *args,
2175 const char *dev_name)
2176 {
2177 int port = 0;
2178 int max_namelen = PAGE_SIZE;
2179 int max_pathlen = NFS_MAXPATHLEN;
2180 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2181
2182 if (nfs_parse_mount_options((char *)options, args) == 0)
2183 return -EINVAL;
2184
2185 if (!nfs_verify_server_address(sap))
2186 goto out_no_address;
2187
2188 if (args->version == 4) {
2189 #if IS_ENABLED(CONFIG_NFS_V4)
2190 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
2191 port = NFS_RDMA_PORT;
2192 else
2193 port = NFS_PORT;
2194 max_namelen = NFS4_MAXNAMLEN;
2195 max_pathlen = NFS4_MAXPATHLEN;
2196 nfs_validate_transport_protocol(args);
2197 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2198 goto out_invalid_transport_udp;
2199 nfs4_validate_mount_flags(args);
2200 #else
2201 goto out_v4_not_compiled;
2202 #endif /* CONFIG_NFS_V4 */
2203 } else {
2204 nfs_set_mount_transport_protocol(args);
2205 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
2206 port = NFS_RDMA_PORT;
2207 }
2208
2209 nfs_set_port(sap, &args->nfs_server.port, port);
2210
2211 return nfs_parse_devname(dev_name,
2212 &args->nfs_server.hostname,
2213 max_namelen,
2214 &args->nfs_server.export_path,
2215 max_pathlen);
2216
2217 #if !IS_ENABLED(CONFIG_NFS_V4)
2218 out_v4_not_compiled:
2219 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2220 return -EPROTONOSUPPORT;
2221 #else
2222 out_invalid_transport_udp:
2223 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2224 return -EINVAL;
2225 #endif /* !CONFIG_NFS_V4 */
2226
2227 out_no_address:
2228 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2229 return -EINVAL;
2230 }
2231
2232 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2233 | NFS_MOUNT_SECURE \
2234 | NFS_MOUNT_TCP \
2235 | NFS_MOUNT_VER3 \
2236 | NFS_MOUNT_KERBEROS \
2237 | NFS_MOUNT_NONLM \
2238 | NFS_MOUNT_BROKEN_SUID \
2239 | NFS_MOUNT_STRICTLOCK \
2240 | NFS_MOUNT_LEGACY_INTERFACE)
2241
2242 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2243 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2244
2245 static int
2246 nfs_compare_remount_data(struct nfs_server *nfss,
2247 struct nfs_parsed_mount_data *data)
2248 {
2249 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2250 data->rsize != nfss->rsize ||
2251 data->wsize != nfss->wsize ||
2252 data->version != nfss->nfs_client->rpc_ops->version ||
2253 data->minorversion != nfss->nfs_client->cl_minorversion ||
2254 data->retrans != nfss->client->cl_timeout->to_retries ||
2255 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2256 data->acregmin != nfss->acregmin / HZ ||
2257 data->acregmax != nfss->acregmax / HZ ||
2258 data->acdirmin != nfss->acdirmin / HZ ||
2259 data->acdirmax != nfss->acdirmax / HZ ||
2260 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2261 (data->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) ||
2262 data->nfs_server.port != nfss->port ||
2263 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2264 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2265 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2266 return -EINVAL;
2267
2268 return 0;
2269 }
2270
2271 int
2272 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2273 {
2274 int error;
2275 struct nfs_server *nfss = sb->s_fs_info;
2276 struct nfs_parsed_mount_data *data;
2277 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2278 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2279 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2280
2281 sync_filesystem(sb);
2282
2283 /*
2284 * Userspace mount programs that send binary options generally send
2285 * them populated with default values. We have no way to know which
2286 * ones were explicitly specified. Fall back to legacy behavior and
2287 * just return success.
2288 */
2289 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2290 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2291 options->version <= 6))))
2292 return 0;
2293
2294 data = nfs_alloc_parsed_mount_data();
2295 if (data == NULL)
2296 return -ENOMEM;
2297
2298 /* fill out struct with values from existing mount */
2299 data->flags = nfss->flags;
2300 data->rsize = nfss->rsize;
2301 data->wsize = nfss->wsize;
2302 data->retrans = nfss->client->cl_timeout->to_retries;
2303 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2304 data->acregmin = nfss->acregmin / HZ;
2305 data->acregmax = nfss->acregmax / HZ;
2306 data->acdirmin = nfss->acdirmin / HZ;
2307 data->acdirmax = nfss->acdirmax / HZ;
2308 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2309 data->nfs_server.port = nfss->port;
2310 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2311 data->version = nfsvers;
2312 data->minorversion = nfss->nfs_client->cl_minorversion;
2313 data->net = current->nsproxy->net_ns;
2314 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2315 data->nfs_server.addrlen);
2316
2317 /* overwrite those values with any that were specified */
2318 error = -EINVAL;
2319 if (!nfs_parse_mount_options((char *)options, data))
2320 goto out;
2321
2322 /*
2323 * noac is a special case. It implies -o sync, but that's not
2324 * necessarily reflected in the mtab options. do_remount_sb
2325 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
2326 * remount options, so we have to explicitly reset it.
2327 */
2328 if (data->flags & NFS_MOUNT_NOAC)
2329 *flags |= SB_SYNCHRONOUS;
2330
2331 /* compare new mount options with old ones */
2332 error = nfs_compare_remount_data(nfss, data);
2333 if (!error)
2334 error = security_sb_remount(sb, data->lsm_opts);
2335 out:
2336 nfs_free_parsed_mount_data(data);
2337 return error;
2338 }
2339 EXPORT_SYMBOL_GPL(nfs_remount);
2340
2341 /*
2342 * Finish setting up an NFS superblock
2343 */
2344 static void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2345 {
2346 struct nfs_parsed_mount_data *data = mount_info->parsed;
2347 struct nfs_server *server = NFS_SB(sb);
2348
2349 sb->s_blocksize_bits = 0;
2350 sb->s_blocksize = 0;
2351 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2352 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2353 if (data && data->bsize)
2354 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2355
2356 if (server->nfs_client->rpc_ops->version != 2) {
2357 /* The VFS shouldn't apply the umask to mode bits. We will do
2358 * so ourselves when necessary.
2359 */
2360 sb->s_flags |= SB_POSIXACL;
2361 sb->s_time_gran = 1;
2362 sb->s_export_op = &nfs_export_ops;
2363 } else
2364 sb->s_time_gran = 1000;
2365
2366 if (server->nfs_client->rpc_ops->version != 4) {
2367 sb->s_time_min = 0;
2368 sb->s_time_max = U32_MAX;
2369 } else {
2370 sb->s_time_min = S64_MIN;
2371 sb->s_time_max = S64_MAX;
2372 }
2373
2374 sb->s_magic = NFS_SUPER_MAGIC;
2375
2376 /* We probably want something more informative here */
2377 snprintf(sb->s_id, sizeof(sb->s_id),
2378 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2379
2380 if (sb->s_blocksize == 0)
2381 sb->s_blocksize = nfs_block_bits(server->wsize,
2382 &sb->s_blocksize_bits);
2383
2384 nfs_super_set_maxbytes(sb, server->maxfilesize);
2385 }
2386
2387 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2388 {
2389 const struct nfs_server *a = s->s_fs_info;
2390 const struct rpc_clnt *clnt_a = a->client;
2391 const struct rpc_clnt *clnt_b = b->client;
2392
2393 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2394 goto Ebusy;
2395 if (a->nfs_client != b->nfs_client)
2396 goto Ebusy;
2397 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2398 goto Ebusy;
2399 if (a->wsize != b->wsize)
2400 goto Ebusy;
2401 if (a->rsize != b->rsize)
2402 goto Ebusy;
2403 if (a->acregmin != b->acregmin)
2404 goto Ebusy;
2405 if (a->acregmax != b->acregmax)
2406 goto Ebusy;
2407 if (a->acdirmin != b->acdirmin)
2408 goto Ebusy;
2409 if (a->acdirmax != b->acdirmax)
2410 goto Ebusy;
2411 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2412 goto Ebusy;
2413 return 1;
2414 Ebusy:
2415 return 0;
2416 }
2417
2418 struct nfs_sb_mountdata {
2419 struct nfs_server *server;
2420 int mntflags;
2421 };
2422
2423 static int nfs_set_super(struct super_block *s, void *data)
2424 {
2425 struct nfs_sb_mountdata *sb_mntdata = data;
2426 struct nfs_server *server = sb_mntdata->server;
2427 int ret;
2428
2429 s->s_flags = sb_mntdata->mntflags;
2430 s->s_fs_info = server;
2431 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2432 ret = set_anon_super(s, server);
2433 if (ret == 0)
2434 server->s_dev = s->s_dev;
2435 return ret;
2436 }
2437
2438 static int nfs_compare_super_address(struct nfs_server *server1,
2439 struct nfs_server *server2)
2440 {
2441 struct sockaddr *sap1, *sap2;
2442 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
2443 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
2444
2445 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
2446 return 0;
2447
2448 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2449 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2450
2451 if (sap1->sa_family != sap2->sa_family)
2452 return 0;
2453
2454 switch (sap1->sa_family) {
2455 case AF_INET: {
2456 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2457 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2458 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2459 return 0;
2460 if (sin1->sin_port != sin2->sin_port)
2461 return 0;
2462 break;
2463 }
2464 case AF_INET6: {
2465 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2466 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2467 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2468 return 0;
2469 if (sin1->sin6_port != sin2->sin6_port)
2470 return 0;
2471 break;
2472 }
2473 default:
2474 return 0;
2475 }
2476
2477 return 1;
2478 }
2479
2480 static int nfs_compare_userns(const struct nfs_server *old,
2481 const struct nfs_server *new)
2482 {
2483 const struct user_namespace *oldns = &init_user_ns;
2484 const struct user_namespace *newns = &init_user_ns;
2485
2486 if (old->client && old->client->cl_cred)
2487 oldns = old->client->cl_cred->user_ns;
2488 if (new->client && new->client->cl_cred)
2489 newns = new->client->cl_cred->user_ns;
2490 if (oldns != newns)
2491 return 0;
2492 return 1;
2493 }
2494
2495 static int nfs_compare_super(struct super_block *sb, void *data)
2496 {
2497 struct nfs_sb_mountdata *sb_mntdata = data;
2498 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2499 int mntflags = sb_mntdata->mntflags;
2500
2501 if (!nfs_compare_super_address(old, server))
2502 return 0;
2503 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2504 if (old->flags & NFS_MOUNT_UNSHARED)
2505 return 0;
2506 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2507 return 0;
2508 if (!nfs_compare_userns(old, server))
2509 return 0;
2510 return nfs_compare_mount_options(sb, server, mntflags);
2511 }
2512
2513 #ifdef CONFIG_NFS_FSCACHE
2514 static void nfs_get_cache_cookie(struct super_block *sb,
2515 struct nfs_parsed_mount_data *parsed,
2516 struct nfs_clone_mount *cloned)
2517 {
2518 struct nfs_server *nfss = NFS_SB(sb);
2519 char *uniq = NULL;
2520 int ulen = 0;
2521
2522 nfss->fscache_key = NULL;
2523 nfss->fscache = NULL;
2524
2525 if (parsed) {
2526 if (!(parsed->options & NFS_OPTION_FSCACHE))
2527 return;
2528 if (parsed->fscache_uniq) {
2529 uniq = parsed->fscache_uniq;
2530 ulen = strlen(parsed->fscache_uniq);
2531 }
2532 } else if (cloned) {
2533 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2534 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2535 return;
2536 if (mnt_s->fscache_key) {
2537 uniq = mnt_s->fscache_key->key.uniquifier;
2538 ulen = mnt_s->fscache_key->key.uniq_len;
2539 }
2540 } else
2541 return;
2542
2543 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2544 }
2545 #else
2546 static void nfs_get_cache_cookie(struct super_block *sb,
2547 struct nfs_parsed_mount_data *parsed,
2548 struct nfs_clone_mount *cloned)
2549 {
2550 }
2551 #endif
2552
2553 static void nfs_set_readahead(struct backing_dev_info *bdi,
2554 unsigned long iomax_pages)
2555 {
2556 bdi->ra_pages = VM_READAHEAD_PAGES;
2557 bdi->io_pages = iomax_pages;
2558 }
2559
2560 static struct dentry *nfs_fs_mount_common(int flags, const char *dev_name,
2561 struct nfs_mount_info *mount_info)
2562 {
2563 struct super_block *s;
2564 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2565 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2566 struct nfs_server *server = mount_info->server;
2567 unsigned long kflags = 0, kflags_out = 0;
2568 struct nfs_sb_mountdata sb_mntdata = {
2569 .mntflags = flags,
2570 .server = server,
2571 };
2572 int error;
2573
2574 mount_info->server = NULL;
2575 if (IS_ERR(server))
2576 return ERR_CAST(server);
2577
2578 if (server->flags & NFS_MOUNT_UNSHARED)
2579 compare_super = NULL;
2580
2581 /* -o noac implies -o sync */
2582 if (server->flags & NFS_MOUNT_NOAC)
2583 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2584
2585 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2586 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS)
2587 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2588
2589 /* Get a superblock - note that we may end up sharing one that already exists */
2590 s = sget(mount_info->nfs_mod->nfs_fs, compare_super, nfs_set_super,
2591 flags, &sb_mntdata);
2592 if (IS_ERR(s)) {
2593 mntroot = ERR_CAST(s);
2594 goto out_err_nosb;
2595 }
2596
2597 if (s->s_fs_info != server) {
2598 nfs_free_server(server);
2599 server = NULL;
2600 } else {
2601 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
2602 MINOR(server->s_dev));
2603 if (error) {
2604 mntroot = ERR_PTR(error);
2605 goto error_splat_super;
2606 }
2607 nfs_set_readahead(s->s_bdi, server->rpages);
2608 server->super = s;
2609 }
2610
2611 if (!s->s_root) {
2612 unsigned bsize = mount_info->inherited_bsize;
2613 /* initial superblock/root creation */
2614 nfs_fill_super(s, mount_info);
2615 if (bsize) {
2616 s->s_blocksize_bits = bsize;
2617 s->s_blocksize = 1U << bsize;
2618 }
2619 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2620 if (!(server->flags & NFS_MOUNT_UNSHARED))
2621 s->s_iflags |= SB_I_MULTIROOT;
2622 }
2623
2624 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2625 if (IS_ERR(mntroot))
2626 goto error_splat_super;
2627
2628
2629 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2630 kflags |= SECURITY_LSM_NATIVE_LABELS;
2631 if (mount_info->cloned) {
2632 if (d_inode(mntroot)->i_fop != &nfs_dir_operations) {
2633 error = -ESTALE;
2634 goto error_splat_root;
2635 }
2636 /* clone any lsm security options from the parent to the new sb */
2637 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags,
2638 &kflags_out);
2639 } else {
2640 error = security_sb_set_mnt_opts(s, mount_info->parsed->lsm_opts,
2641 kflags, &kflags_out);
2642 }
2643 if (error)
2644 goto error_splat_root;
2645 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2646 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2647 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2648 if (error)
2649 goto error_splat_root;
2650
2651 s->s_flags |= SB_ACTIVE;
2652
2653 out:
2654 return mntroot;
2655
2656 out_err_nosb:
2657 nfs_free_server(server);
2658 goto out;
2659
2660 error_splat_root:
2661 dput(mntroot);
2662 mntroot = ERR_PTR(error);
2663 error_splat_super:
2664 deactivate_locked_super(s);
2665 goto out;
2666 }
2667
2668 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2669 int flags, const char *dev_name, void *raw_data)
2670 {
2671 struct nfs_mount_info mount_info = {
2672 };
2673 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2674 struct nfs_subversion *nfs_mod;
2675 int error;
2676
2677 mount_info.parsed = nfs_alloc_parsed_mount_data();
2678 mount_info.mntfh = nfs_alloc_fhandle();
2679 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2680 goto out;
2681
2682 /* Validate the mount data */
2683 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2684 if (error == NFS_TEXT_DATA)
2685 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2686 if (error < 0) {
2687 mntroot = ERR_PTR(error);
2688 goto out;
2689 }
2690
2691 nfs_mod = get_nfs_version(mount_info.parsed->version);
2692 if (IS_ERR(nfs_mod)) {
2693 mntroot = ERR_CAST(nfs_mod);
2694 goto out;
2695 }
2696 mount_info.nfs_mod = nfs_mod;
2697
2698 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info);
2699
2700 put_nfs_version(nfs_mod);
2701 out:
2702 nfs_free_parsed_mount_data(mount_info.parsed);
2703 nfs_free_fhandle(mount_info.mntfh);
2704 return mntroot;
2705 }
2706 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2707
2708 /*
2709 * Destroy an NFS2/3 superblock
2710 */
2711 void nfs_kill_super(struct super_block *s)
2712 {
2713 struct nfs_server *server = NFS_SB(s);
2714 dev_t dev = s->s_dev;
2715
2716 generic_shutdown_super(s);
2717
2718 nfs_fscache_release_super_cookie(s);
2719
2720 nfs_free_server(server);
2721 free_anon_bdev(dev);
2722 }
2723 EXPORT_SYMBOL_GPL(nfs_kill_super);
2724
2725 /*
2726 * Internal use only: mount_info is already set up by caller.
2727 * Used for mountpoint crossings and for nfs4 root.
2728 */
2729 static struct dentry *
2730 nfs_prepared_mount(struct file_system_type *fs_type, int flags,
2731 const char *dev_name, void *raw_data)
2732 {
2733 return nfs_fs_mount_common(flags, dev_name, raw_data);
2734 }
2735
2736 #if IS_ENABLED(CONFIG_NFS_V4)
2737
2738 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2739 {
2740 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2741 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2742 }
2743
2744 /*
2745 * Validate NFSv4 mount options
2746 */
2747 static int nfs4_validate_mount_data(void *options,
2748 struct nfs_parsed_mount_data *args,
2749 const char *dev_name)
2750 {
2751 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2752 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2753 char *c;
2754
2755 if (data == NULL)
2756 goto out_no_data;
2757
2758 args->version = 4;
2759
2760 switch (data->version) {
2761 case 1:
2762 if (data->host_addrlen > sizeof(args->nfs_server.address))
2763 goto out_no_address;
2764 if (data->host_addrlen == 0)
2765 goto out_no_address;
2766 args->nfs_server.addrlen = data->host_addrlen;
2767 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2768 return -EFAULT;
2769 if (!nfs_verify_server_address(sap))
2770 goto out_no_address;
2771 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2772
2773 if (data->auth_flavourlen) {
2774 rpc_authflavor_t pseudoflavor;
2775 if (data->auth_flavourlen > 1)
2776 goto out_inval_auth;
2777 if (copy_from_user(&pseudoflavor,
2778 data->auth_flavours,
2779 sizeof(pseudoflavor)))
2780 return -EFAULT;
2781 args->selected_flavor = pseudoflavor;
2782 } else
2783 args->selected_flavor = RPC_AUTH_UNIX;
2784
2785 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2786 if (IS_ERR(c))
2787 return PTR_ERR(c);
2788 args->nfs_server.hostname = c;
2789
2790 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2791 if (IS_ERR(c))
2792 return PTR_ERR(c);
2793 args->nfs_server.export_path = c;
2794 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2795
2796 c = strndup_user(data->client_addr.data, 16);
2797 if (IS_ERR(c))
2798 return PTR_ERR(c);
2799 args->client_address = c;
2800
2801 /*
2802 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2803 * can deal with.
2804 */
2805
2806 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2807 args->rsize = data->rsize;
2808 args->wsize = data->wsize;
2809 args->timeo = data->timeo;
2810 args->retrans = data->retrans;
2811 args->acregmin = data->acregmin;
2812 args->acregmax = data->acregmax;
2813 args->acdirmin = data->acdirmin;
2814 args->acdirmax = data->acdirmax;
2815 args->nfs_server.protocol = data->proto;
2816 nfs_validate_transport_protocol(args);
2817 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2818 goto out_invalid_transport_udp;
2819
2820 break;
2821 default:
2822 return NFS_TEXT_DATA;
2823 }
2824
2825 return 0;
2826
2827 out_no_data:
2828 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2829 return -EINVAL;
2830
2831 out_inval_auth:
2832 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2833 data->auth_flavourlen);
2834 return -EINVAL;
2835
2836 out_no_address:
2837 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2838 return -EINVAL;
2839
2840 out_invalid_transport_udp:
2841 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2842 return -EINVAL;
2843 }
2844
2845 /*
2846 * NFS v4 module parameters need to stay in the
2847 * NFS client for backwards compatibility
2848 */
2849 unsigned int nfs_callback_set_tcpport;
2850 unsigned short nfs_callback_nr_threads;
2851 /* Default cache timeout is 10 minutes */
2852 unsigned int nfs_idmap_cache_timeout = 600;
2853 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2854 bool nfs4_disable_idmapping = true;
2855 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2856 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
2857 unsigned short send_implementation_id = 1;
2858 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2859 bool recover_lost_locks = false;
2860
2861 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
2862 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2863 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2864 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2865 EXPORT_SYMBOL_GPL(max_session_slots);
2866 EXPORT_SYMBOL_GPL(max_session_cb_slots);
2867 EXPORT_SYMBOL_GPL(send_implementation_id);
2868 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2869 EXPORT_SYMBOL_GPL(recover_lost_locks);
2870
2871 #define NFS_CALLBACK_MAXPORTNR (65535U)
2872
2873 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2874 {
2875 unsigned long num;
2876 int ret;
2877
2878 if (!val)
2879 return -EINVAL;
2880 ret = kstrtoul(val, 0, &num);
2881 if (ret || num > NFS_CALLBACK_MAXPORTNR)
2882 return -EINVAL;
2883 *((unsigned int *)kp->arg) = num;
2884 return 0;
2885 }
2886 static const struct kernel_param_ops param_ops_portnr = {
2887 .set = param_set_portnr,
2888 .get = param_get_uint,
2889 };
2890 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2891
2892 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2893 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
2894 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
2895 "assigned to the NFSv4 callback channels.");
2896 module_param(nfs_idmap_cache_timeout, int, 0644);
2897 module_param(nfs4_disable_idmapping, bool, 0644);
2898 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2899 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2900 MODULE_PARM_DESC(nfs4_disable_idmapping,
2901 "Turn off NFSv4 idmapping when using 'sec=sys'");
2902 module_param(max_session_slots, ushort, 0644);
2903 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2904 "requests the client will negotiate");
2905 module_param(max_session_cb_slots, ushort, 0644);
2906 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
2907 "callbacks the client will process for a given server");
2908 module_param(send_implementation_id, ushort, 0644);
2909 MODULE_PARM_DESC(send_implementation_id,
2910 "Send implementation ID with NFSv4.1 exchange_id");
2911 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2912
2913 module_param(recover_lost_locks, bool, 0644);
2914 MODULE_PARM_DESC(recover_lost_locks,
2915 "If the server reports that a lock might be lost, "
2916 "try to recover it risking data corruption.");
2917
2918
2919 #endif /* CONFIG_NFS_V4 */
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