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NFSv4.1: Ensure that we free the lock stateid on the server
[mirror_ubuntu-bionic-kernel.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/addr.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/sunrpc/xprtsock.h>
38 #include <linux/sunrpc/xprtrdma.h>
39 #include <linux/nfs_fs.h>
40 #include <linux/nfs_mount.h>
41 #include <linux/nfs4_mount.h>
42 #include <linux/lockd/bind.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56 #include <linux/nsproxy.h>
57 #include <linux/rcupdate.h>
58
59 #include <asm/uaccess.h>
60
61 #include "nfs4_fs.h"
62 #include "callback.h"
63 #include "delegation.h"
64 #include "iostat.h"
65 #include "internal.h"
66 #include "fscache.h"
67 #include "nfs4session.h"
68 #include "pnfs.h"
69 #include "nfs.h"
70
71 #define NFSDBG_FACILITY NFSDBG_VFS
72 #define NFS_TEXT_DATA 1
73
74 #if IS_ENABLED(CONFIG_NFS_V3)
75 #define NFS_DEFAULT_VERSION 3
76 #else
77 #define NFS_DEFAULT_VERSION 2
78 #endif
79
80 enum {
81 /* Mount options that take no arguments */
82 Opt_soft, Opt_hard,
83 Opt_posix, Opt_noposix,
84 Opt_cto, Opt_nocto,
85 Opt_ac, Opt_noac,
86 Opt_lock, Opt_nolock,
87 Opt_udp, Opt_tcp, Opt_rdma,
88 Opt_acl, Opt_noacl,
89 Opt_rdirplus, Opt_nordirplus,
90 Opt_sharecache, Opt_nosharecache,
91 Opt_resvport, Opt_noresvport,
92 Opt_fscache, Opt_nofscache,
93 Opt_migration, Opt_nomigration,
94
95 /* Mount options that take integer arguments */
96 Opt_port,
97 Opt_rsize, Opt_wsize, Opt_bsize,
98 Opt_timeo, Opt_retrans,
99 Opt_acregmin, Opt_acregmax,
100 Opt_acdirmin, Opt_acdirmax,
101 Opt_actimeo,
102 Opt_namelen,
103 Opt_mountport,
104 Opt_mountvers,
105 Opt_minorversion,
106
107 /* Mount options that take string arguments */
108 Opt_nfsvers,
109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
111 Opt_lookupcache,
112 Opt_fscache_uniq,
113 Opt_local_lock,
114
115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
117
118 Opt_err
119 };
120
121 static const match_table_t nfs_mount_option_tokens = {
122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
124 { Opt_userspace, "retry=%s" },
125
126 { Opt_sloppy, "sloppy" },
127
128 { Opt_soft, "soft" },
129 { Opt_hard, "hard" },
130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
132 { Opt_posix, "posix" },
133 { Opt_noposix, "noposix" },
134 { Opt_cto, "cto" },
135 { Opt_nocto, "nocto" },
136 { Opt_ac, "ac" },
137 { Opt_noac, "noac" },
138 { Opt_lock, "lock" },
139 { Opt_nolock, "nolock" },
140 { Opt_udp, "udp" },
141 { Opt_tcp, "tcp" },
142 { Opt_rdma, "rdma" },
143 { Opt_acl, "acl" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
151 { Opt_fscache, "fsc" },
152 { Opt_nofscache, "nofsc" },
153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
155
156 { Opt_port, "port=%s" },
157 { Opt_rsize, "rsize=%s" },
158 { Opt_wsize, "wsize=%s" },
159 { Opt_bsize, "bsize=%s" },
160 { Opt_timeo, "timeo=%s" },
161 { Opt_retrans, "retrans=%s" },
162 { Opt_acregmin, "acregmin=%s" },
163 { Opt_acregmax, "acregmax=%s" },
164 { Opt_acdirmin, "acdirmin=%s" },
165 { Opt_acdirmax, "acdirmax=%s" },
166 { Opt_actimeo, "actimeo=%s" },
167 { Opt_namelen, "namlen=%s" },
168 { Opt_mountport, "mountport=%s" },
169 { Opt_mountvers, "mountvers=%s" },
170 { Opt_minorversion, "minorversion=%s" },
171
172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
174
175 { Opt_sec, "sec=%s" },
176 { Opt_proto, "proto=%s" },
177 { Opt_mountproto, "mountproto=%s" },
178 { Opt_addr, "addr=%s" },
179 { Opt_clientaddr, "clientaddr=%s" },
180 { Opt_mounthost, "mounthost=%s" },
181 { Opt_mountaddr, "mountaddr=%s" },
182
183 { Opt_lookupcache, "lookupcache=%s" },
184 { Opt_fscache_uniq, "fsc=%s" },
185 { Opt_local_lock, "local_lock=%s" },
186
187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
189
190 { Opt_err, NULL }
191 };
192
193 enum {
194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
195
196 Opt_xprt_err
197 };
198
199 static const match_table_t nfs_xprt_protocol_tokens = {
200 { Opt_xprt_udp, "udp" },
201 { Opt_xprt_udp6, "udp6" },
202 { Opt_xprt_tcp, "tcp" },
203 { Opt_xprt_tcp6, "tcp6" },
204 { Opt_xprt_rdma, "rdma" },
205
206 { Opt_xprt_err, NULL }
207 };
208
209 enum {
210 Opt_sec_none, Opt_sec_sys,
211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
214
215 Opt_sec_err
216 };
217
218 static const match_table_t nfs_secflavor_tokens = {
219 { Opt_sec_none, "none" },
220 { Opt_sec_none, "null" },
221 { Opt_sec_sys, "sys" },
222
223 { Opt_sec_krb5, "krb5" },
224 { Opt_sec_krb5i, "krb5i" },
225 { Opt_sec_krb5p, "krb5p" },
226
227 { Opt_sec_lkey, "lkey" },
228 { Opt_sec_lkeyi, "lkeyi" },
229 { Opt_sec_lkeyp, "lkeyp" },
230
231 { Opt_sec_spkm, "spkm3" },
232 { Opt_sec_spkmi, "spkm3i" },
233 { Opt_sec_spkmp, "spkm3p" },
234
235 { Opt_sec_err, NULL }
236 };
237
238 enum {
239 Opt_lookupcache_all, Opt_lookupcache_positive,
240 Opt_lookupcache_none,
241
242 Opt_lookupcache_err
243 };
244
245 static match_table_t nfs_lookupcache_tokens = {
246 { Opt_lookupcache_all, "all" },
247 { Opt_lookupcache_positive, "pos" },
248 { Opt_lookupcache_positive, "positive" },
249 { Opt_lookupcache_none, "none" },
250
251 { Opt_lookupcache_err, NULL }
252 };
253
254 enum {
255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
256 Opt_local_lock_none,
257
258 Opt_local_lock_err
259 };
260
261 static match_table_t nfs_local_lock_tokens = {
262 { Opt_local_lock_all, "all" },
263 { Opt_local_lock_flock, "flock" },
264 { Opt_local_lock_posix, "posix" },
265 { Opt_local_lock_none, "none" },
266
267 { Opt_local_lock_err, NULL }
268 };
269
270 enum {
271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272 Opt_vers_4_1,
273
274 Opt_vers_err
275 };
276
277 static match_table_t nfs_vers_tokens = {
278 { Opt_vers_2, "2" },
279 { Opt_vers_3, "3" },
280 { Opt_vers_4, "4" },
281 { Opt_vers_4_0, "4.0" },
282 { Opt_vers_4_1, "4.1" },
283
284 { Opt_vers_err, NULL }
285 };
286
287 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data);
289
290 struct file_system_type nfs_fs_type = {
291 .owner = THIS_MODULE,
292 .name = "nfs",
293 .mount = nfs_fs_mount,
294 .kill_sb = nfs_kill_super,
295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
296 };
297 EXPORT_SYMBOL_GPL(nfs_fs_type);
298
299 struct file_system_type nfs_xdev_fs_type = {
300 .owner = THIS_MODULE,
301 .name = "nfs",
302 .mount = nfs_xdev_mount,
303 .kill_sb = nfs_kill_super,
304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
305 };
306
307 const struct super_operations nfs_sops = {
308 .alloc_inode = nfs_alloc_inode,
309 .destroy_inode = nfs_destroy_inode,
310 .write_inode = nfs_write_inode,
311 .drop_inode = nfs_drop_inode,
312 .put_super = nfs_put_super,
313 .statfs = nfs_statfs,
314 .evict_inode = nfs_evict_inode,
315 .umount_begin = nfs_umount_begin,
316 .show_options = nfs_show_options,
317 .show_devname = nfs_show_devname,
318 .show_path = nfs_show_path,
319 .show_stats = nfs_show_stats,
320 .remount_fs = nfs_remount,
321 };
322 EXPORT_SYMBOL_GPL(nfs_sops);
323
324 #if IS_ENABLED(CONFIG_NFS_V4)
325 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
326 static int nfs4_validate_mount_data(void *options,
327 struct nfs_parsed_mount_data *args, const char *dev_name);
328
329 struct file_system_type nfs4_fs_type = {
330 .owner = THIS_MODULE,
331 .name = "nfs4",
332 .mount = nfs_fs_mount,
333 .kill_sb = nfs_kill_super,
334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
335 };
336 EXPORT_SYMBOL_GPL(nfs4_fs_type);
337
338 static int __init register_nfs4_fs(void)
339 {
340 return register_filesystem(&nfs4_fs_type);
341 }
342
343 static void unregister_nfs4_fs(void)
344 {
345 unregister_filesystem(&nfs4_fs_type);
346 }
347 #else
348 static int __init register_nfs4_fs(void)
349 {
350 return 0;
351 }
352
353 static void unregister_nfs4_fs(void)
354 {
355 }
356 #endif
357
358 static struct shrinker acl_shrinker = {
359 .shrink = nfs_access_cache_shrinker,
360 .seeks = DEFAULT_SEEKS,
361 };
362
363 /*
364 * Register the NFS filesystems
365 */
366 int __init register_nfs_fs(void)
367 {
368 int ret;
369
370 ret = register_filesystem(&nfs_fs_type);
371 if (ret < 0)
372 goto error_0;
373
374 ret = register_nfs4_fs();
375 if (ret < 0)
376 goto error_1;
377
378 ret = nfs_register_sysctl();
379 if (ret < 0)
380 goto error_2;
381 register_shrinker(&acl_shrinker);
382 return 0;
383
384 error_2:
385 unregister_nfs4_fs();
386 error_1:
387 unregister_filesystem(&nfs_fs_type);
388 error_0:
389 return ret;
390 }
391
392 /*
393 * Unregister the NFS filesystems
394 */
395 void __exit unregister_nfs_fs(void)
396 {
397 unregister_shrinker(&acl_shrinker);
398 nfs_unregister_sysctl();
399 unregister_nfs4_fs();
400 unregister_filesystem(&nfs_fs_type);
401 }
402
403 void nfs_sb_active(struct super_block *sb)
404 {
405 struct nfs_server *server = NFS_SB(sb);
406
407 if (atomic_inc_return(&server->active) == 1)
408 atomic_inc(&sb->s_active);
409 }
410 EXPORT_SYMBOL_GPL(nfs_sb_active);
411
412 void nfs_sb_deactive(struct super_block *sb)
413 {
414 struct nfs_server *server = NFS_SB(sb);
415
416 if (atomic_dec_and_test(&server->active))
417 deactivate_super(sb);
418 }
419 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
420
421 /*
422 * Deliver file system statistics to userspace
423 */
424 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
425 {
426 struct nfs_server *server = NFS_SB(dentry->d_sb);
427 unsigned char blockbits;
428 unsigned long blockres;
429 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
430 struct nfs_fsstat res;
431 int error = -ENOMEM;
432
433 res.fattr = nfs_alloc_fattr();
434 if (res.fattr == NULL)
435 goto out_err;
436
437 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
438 if (unlikely(error == -ESTALE)) {
439 struct dentry *pd_dentry;
440
441 pd_dentry = dget_parent(dentry);
442 if (pd_dentry != NULL) {
443 nfs_zap_caches(pd_dentry->d_inode);
444 dput(pd_dentry);
445 }
446 }
447 nfs_free_fattr(res.fattr);
448 if (error < 0)
449 goto out_err;
450
451 buf->f_type = NFS_SUPER_MAGIC;
452
453 /*
454 * Current versions of glibc do not correctly handle the
455 * case where f_frsize != f_bsize. Eventually we want to
456 * report the value of wtmult in this field.
457 */
458 buf->f_frsize = dentry->d_sb->s_blocksize;
459
460 /*
461 * On most *nix systems, f_blocks, f_bfree, and f_bavail
462 * are reported in units of f_frsize. Linux hasn't had
463 * an f_frsize field in its statfs struct until recently,
464 * thus historically Linux's sys_statfs reports these
465 * fields in units of f_bsize.
466 */
467 buf->f_bsize = dentry->d_sb->s_blocksize;
468 blockbits = dentry->d_sb->s_blocksize_bits;
469 blockres = (1 << blockbits) - 1;
470 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
471 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
472 buf->f_bavail = (res.abytes + blockres) >> blockbits;
473
474 buf->f_files = res.tfiles;
475 buf->f_ffree = res.afiles;
476
477 buf->f_namelen = server->namelen;
478
479 return 0;
480
481 out_err:
482 dprintk("%s: statfs error = %d\n", __func__, -error);
483 return error;
484 }
485 EXPORT_SYMBOL_GPL(nfs_statfs);
486
487 /*
488 * Map the security flavour number to a name
489 */
490 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
491 {
492 static const struct {
493 rpc_authflavor_t flavour;
494 const char *str;
495 } sec_flavours[] = {
496 { RPC_AUTH_NULL, "null" },
497 { RPC_AUTH_UNIX, "sys" },
498 { RPC_AUTH_GSS_KRB5, "krb5" },
499 { RPC_AUTH_GSS_KRB5I, "krb5i" },
500 { RPC_AUTH_GSS_KRB5P, "krb5p" },
501 { RPC_AUTH_GSS_LKEY, "lkey" },
502 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
503 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
504 { RPC_AUTH_GSS_SPKM, "spkm" },
505 { RPC_AUTH_GSS_SPKMI, "spkmi" },
506 { RPC_AUTH_GSS_SPKMP, "spkmp" },
507 { UINT_MAX, "unknown" }
508 };
509 int i;
510
511 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
512 if (sec_flavours[i].flavour == flavour)
513 break;
514 }
515 return sec_flavours[i].str;
516 }
517
518 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
519 int showdefaults)
520 {
521 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
522
523 seq_printf(m, ",mountproto=");
524 switch (sap->sa_family) {
525 case AF_INET:
526 switch (nfss->mountd_protocol) {
527 case IPPROTO_UDP:
528 seq_printf(m, RPCBIND_NETID_UDP);
529 break;
530 case IPPROTO_TCP:
531 seq_printf(m, RPCBIND_NETID_TCP);
532 break;
533 default:
534 if (showdefaults)
535 seq_printf(m, "auto");
536 }
537 break;
538 case AF_INET6:
539 switch (nfss->mountd_protocol) {
540 case IPPROTO_UDP:
541 seq_printf(m, RPCBIND_NETID_UDP6);
542 break;
543 case IPPROTO_TCP:
544 seq_printf(m, RPCBIND_NETID_TCP6);
545 break;
546 default:
547 if (showdefaults)
548 seq_printf(m, "auto");
549 }
550 break;
551 default:
552 if (showdefaults)
553 seq_printf(m, "auto");
554 }
555 }
556
557 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
558 int showdefaults)
559 {
560 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
561
562 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
563 return;
564
565 switch (sap->sa_family) {
566 case AF_INET: {
567 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
568 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
569 break;
570 }
571 case AF_INET6: {
572 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
573 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
574 break;
575 }
576 default:
577 if (showdefaults)
578 seq_printf(m, ",mountaddr=unspecified");
579 }
580
581 if (nfss->mountd_version || showdefaults)
582 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
583 if ((nfss->mountd_port &&
584 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
585 showdefaults)
586 seq_printf(m, ",mountport=%u", nfss->mountd_port);
587
588 nfs_show_mountd_netid(m, nfss, showdefaults);
589 }
590
591 #if IS_ENABLED(CONFIG_NFS_V4)
592 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
593 int showdefaults)
594 {
595 struct nfs_client *clp = nfss->nfs_client;
596
597 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
598 }
599 #else
600 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
601 int showdefaults)
602 {
603 }
604 #endif
605
606 static void nfs_show_nfs_version(struct seq_file *m,
607 unsigned int version,
608 unsigned int minorversion)
609 {
610 seq_printf(m, ",vers=%u", version);
611 if (version == 4)
612 seq_printf(m, ".%u", minorversion);
613 }
614
615 /*
616 * Describe the mount options in force on this server representation
617 */
618 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
619 int showdefaults)
620 {
621 static const struct proc_nfs_info {
622 int flag;
623 const char *str;
624 const char *nostr;
625 } nfs_info[] = {
626 { NFS_MOUNT_SOFT, ",soft", ",hard" },
627 { NFS_MOUNT_POSIX, ",posix", "" },
628 { NFS_MOUNT_NOCTO, ",nocto", "" },
629 { NFS_MOUNT_NOAC, ",noac", "" },
630 { NFS_MOUNT_NONLM, ",nolock", "" },
631 { NFS_MOUNT_NOACL, ",noacl", "" },
632 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
633 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
634 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
635 { 0, NULL, NULL }
636 };
637 const struct proc_nfs_info *nfs_infop;
638 struct nfs_client *clp = nfss->nfs_client;
639 u32 version = clp->rpc_ops->version;
640 int local_flock, local_fcntl;
641
642 nfs_show_nfs_version(m, version, clp->cl_minorversion);
643 seq_printf(m, ",rsize=%u", nfss->rsize);
644 seq_printf(m, ",wsize=%u", nfss->wsize);
645 if (nfss->bsize != 0)
646 seq_printf(m, ",bsize=%u", nfss->bsize);
647 seq_printf(m, ",namlen=%u", nfss->namelen);
648 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
649 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
650 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
651 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
652 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
653 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
654 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
655 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
656 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
657 if (nfss->flags & nfs_infop->flag)
658 seq_puts(m, nfs_infop->str);
659 else
660 seq_puts(m, nfs_infop->nostr);
661 }
662 rcu_read_lock();
663 seq_printf(m, ",proto=%s",
664 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
665 rcu_read_unlock();
666 if (version == 4) {
667 if (nfss->port != NFS_PORT)
668 seq_printf(m, ",port=%u", nfss->port);
669 } else
670 if (nfss->port)
671 seq_printf(m, ",port=%u", nfss->port);
672
673 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
674 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
675 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
676
677 if (version != 4)
678 nfs_show_mountd_options(m, nfss, showdefaults);
679 else
680 nfs_show_nfsv4_options(m, nfss, showdefaults);
681
682 if (nfss->options & NFS_OPTION_FSCACHE)
683 seq_printf(m, ",fsc");
684
685 if (nfss->options & NFS_OPTION_MIGRATION)
686 seq_printf(m, ",migration");
687
688 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
689 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
690 seq_printf(m, ",lookupcache=none");
691 else
692 seq_printf(m, ",lookupcache=pos");
693 }
694
695 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
696 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
697
698 if (!local_flock && !local_fcntl)
699 seq_printf(m, ",local_lock=none");
700 else if (local_flock && local_fcntl)
701 seq_printf(m, ",local_lock=all");
702 else if (local_flock)
703 seq_printf(m, ",local_lock=flock");
704 else
705 seq_printf(m, ",local_lock=posix");
706 }
707
708 /*
709 * Describe the mount options on this VFS mountpoint
710 */
711 int nfs_show_options(struct seq_file *m, struct dentry *root)
712 {
713 struct nfs_server *nfss = NFS_SB(root->d_sb);
714
715 nfs_show_mount_options(m, nfss, 0);
716
717 rcu_read_lock();
718 seq_printf(m, ",addr=%s",
719 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
720 RPC_DISPLAY_ADDR));
721 rcu_read_unlock();
722
723 return 0;
724 }
725 EXPORT_SYMBOL_GPL(nfs_show_options);
726
727 #if IS_ENABLED(CONFIG_NFS_V4)
728 #ifdef CONFIG_NFS_V4_1
729 static void show_sessions(struct seq_file *m, struct nfs_server *server)
730 {
731 if (nfs4_has_session(server->nfs_client))
732 seq_printf(m, ",sessions");
733 }
734 #else
735 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
736 #endif
737 #endif
738
739 #ifdef CONFIG_NFS_V4_1
740 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
741 {
742 seq_printf(m, ",pnfs=");
743 if (server->pnfs_curr_ld)
744 seq_printf(m, "%s", server->pnfs_curr_ld->name);
745 else
746 seq_printf(m, "not configured");
747 }
748
749 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
750 {
751 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
752 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
753 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
754 "date='%llu,%u'",
755 impl_id->name, impl_id->domain,
756 impl_id->date.seconds, impl_id->date.nseconds);
757 }
758 }
759 #else
760 #if IS_ENABLED(CONFIG_NFS_V4)
761 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
762 {
763 }
764 #endif
765 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
766 {
767 }
768 #endif
769
770 int nfs_show_devname(struct seq_file *m, struct dentry *root)
771 {
772 char *page = (char *) __get_free_page(GFP_KERNEL);
773 char *devname, *dummy;
774 int err = 0;
775 if (!page)
776 return -ENOMEM;
777 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
778 if (IS_ERR(devname))
779 err = PTR_ERR(devname);
780 else
781 seq_escape(m, devname, " \t\n\\");
782 free_page((unsigned long)page);
783 return err;
784 }
785 EXPORT_SYMBOL_GPL(nfs_show_devname);
786
787 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
788 {
789 seq_puts(m, "/");
790 return 0;
791 }
792 EXPORT_SYMBOL_GPL(nfs_show_path);
793
794 /*
795 * Present statistical information for this VFS mountpoint
796 */
797 int nfs_show_stats(struct seq_file *m, struct dentry *root)
798 {
799 int i, cpu;
800 struct nfs_server *nfss = NFS_SB(root->d_sb);
801 struct rpc_auth *auth = nfss->client->cl_auth;
802 struct nfs_iostats totals = { };
803
804 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
805
806 /*
807 * Display all mount option settings
808 */
809 seq_printf(m, "\n\topts:\t");
810 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
811 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
812 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
813 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
814 nfs_show_mount_options(m, nfss, 1);
815
816 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
817
818 show_implementation_id(m, nfss);
819
820 seq_printf(m, "\n\tcaps:\t");
821 seq_printf(m, "caps=0x%x", nfss->caps);
822 seq_printf(m, ",wtmult=%u", nfss->wtmult);
823 seq_printf(m, ",dtsize=%u", nfss->dtsize);
824 seq_printf(m, ",bsize=%u", nfss->bsize);
825 seq_printf(m, ",namlen=%u", nfss->namelen);
826
827 #if IS_ENABLED(CONFIG_NFS_V4)
828 if (nfss->nfs_client->rpc_ops->version == 4) {
829 seq_printf(m, "\n\tnfsv4:\t");
830 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
831 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
832 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
833 show_sessions(m, nfss);
834 show_pnfs(m, nfss);
835 }
836 #endif
837
838 /*
839 * Display security flavor in effect for this mount
840 */
841 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
842 if (auth->au_flavor)
843 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
844
845 /*
846 * Display superblock I/O counters
847 */
848 for_each_possible_cpu(cpu) {
849 struct nfs_iostats *stats;
850
851 preempt_disable();
852 stats = per_cpu_ptr(nfss->io_stats, cpu);
853
854 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
855 totals.events[i] += stats->events[i];
856 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
857 totals.bytes[i] += stats->bytes[i];
858 #ifdef CONFIG_NFS_FSCACHE
859 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
860 totals.fscache[i] += stats->fscache[i];
861 #endif
862
863 preempt_enable();
864 }
865
866 seq_printf(m, "\n\tevents:\t");
867 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
868 seq_printf(m, "%lu ", totals.events[i]);
869 seq_printf(m, "\n\tbytes:\t");
870 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
871 seq_printf(m, "%Lu ", totals.bytes[i]);
872 #ifdef CONFIG_NFS_FSCACHE
873 if (nfss->options & NFS_OPTION_FSCACHE) {
874 seq_printf(m, "\n\tfsc:\t");
875 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
876 seq_printf(m, "%Lu ", totals.bytes[i]);
877 }
878 #endif
879 seq_printf(m, "\n");
880
881 rpc_print_iostats(m, nfss->client);
882
883 return 0;
884 }
885 EXPORT_SYMBOL_GPL(nfs_show_stats);
886
887 /*
888 * Begin unmount by attempting to remove all automounted mountpoints we added
889 * in response to xdev traversals and referrals
890 */
891 void nfs_umount_begin(struct super_block *sb)
892 {
893 struct nfs_server *server;
894 struct rpc_clnt *rpc;
895
896 server = NFS_SB(sb);
897 /* -EIO all pending I/O */
898 rpc = server->client_acl;
899 if (!IS_ERR(rpc))
900 rpc_killall_tasks(rpc);
901 rpc = server->client;
902 if (!IS_ERR(rpc))
903 rpc_killall_tasks(rpc);
904 }
905 EXPORT_SYMBOL_GPL(nfs_umount_begin);
906
907 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
908 {
909 struct nfs_parsed_mount_data *data;
910
911 data = kzalloc(sizeof(*data), GFP_KERNEL);
912 if (data) {
913 data->acregmin = NFS_DEF_ACREGMIN;
914 data->acregmax = NFS_DEF_ACREGMAX;
915 data->acdirmin = NFS_DEF_ACDIRMIN;
916 data->acdirmax = NFS_DEF_ACDIRMAX;
917 data->mount_server.port = NFS_UNSPEC_PORT;
918 data->nfs_server.port = NFS_UNSPEC_PORT;
919 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
920 data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR;
921 data->auth_flavor_len = 1;
922 data->minorversion = 0;
923 data->need_mount = true;
924 data->net = current->nsproxy->net_ns;
925 security_init_mnt_opts(&data->lsm_opts);
926 }
927 return data;
928 }
929
930 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
931 {
932 if (data) {
933 kfree(data->client_address);
934 kfree(data->mount_server.hostname);
935 kfree(data->nfs_server.export_path);
936 kfree(data->nfs_server.hostname);
937 kfree(data->fscache_uniq);
938 security_free_mnt_opts(&data->lsm_opts);
939 kfree(data);
940 }
941 }
942
943 /*
944 * Sanity-check a server address provided by the mount command.
945 *
946 * Address family must be initialized, and address must not be
947 * the ANY address for that family.
948 */
949 static int nfs_verify_server_address(struct sockaddr *addr)
950 {
951 switch (addr->sa_family) {
952 case AF_INET: {
953 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
954 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
955 }
956 case AF_INET6: {
957 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
958 return !ipv6_addr_any(sa);
959 }
960 }
961
962 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
963 return 0;
964 }
965
966 /*
967 * Select between a default port value and a user-specified port value.
968 * If a zero value is set, then autobind will be used.
969 */
970 static void nfs_set_port(struct sockaddr *sap, int *port,
971 const unsigned short default_port)
972 {
973 if (*port == NFS_UNSPEC_PORT)
974 *port = default_port;
975
976 rpc_set_port(sap, *port);
977 }
978
979 /*
980 * Sanity check the NFS transport protocol.
981 *
982 */
983 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
984 {
985 switch (mnt->nfs_server.protocol) {
986 case XPRT_TRANSPORT_UDP:
987 case XPRT_TRANSPORT_TCP:
988 case XPRT_TRANSPORT_RDMA:
989 break;
990 default:
991 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
992 }
993 }
994
995 /*
996 * For text based NFSv2/v3 mounts, the mount protocol transport default
997 * settings should depend upon the specified NFS transport.
998 */
999 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1000 {
1001 nfs_validate_transport_protocol(mnt);
1002
1003 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1004 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1005 return;
1006 switch (mnt->nfs_server.protocol) {
1007 case XPRT_TRANSPORT_UDP:
1008 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1009 break;
1010 case XPRT_TRANSPORT_TCP:
1011 case XPRT_TRANSPORT_RDMA:
1012 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1013 }
1014 }
1015
1016 /*
1017 * Parse the value of the 'sec=' option.
1018 */
1019 static int nfs_parse_security_flavors(char *value,
1020 struct nfs_parsed_mount_data *mnt)
1021 {
1022 substring_t args[MAX_OPT_ARGS];
1023
1024 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1025
1026 switch (match_token(value, nfs_secflavor_tokens, args)) {
1027 case Opt_sec_none:
1028 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1029 break;
1030 case Opt_sec_sys:
1031 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1032 break;
1033 case Opt_sec_krb5:
1034 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1035 break;
1036 case Opt_sec_krb5i:
1037 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1038 break;
1039 case Opt_sec_krb5p:
1040 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1041 break;
1042 case Opt_sec_lkey:
1043 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1044 break;
1045 case Opt_sec_lkeyi:
1046 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1047 break;
1048 case Opt_sec_lkeyp:
1049 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1050 break;
1051 case Opt_sec_spkm:
1052 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1053 break;
1054 case Opt_sec_spkmi:
1055 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1056 break;
1057 case Opt_sec_spkmp:
1058 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1059 break;
1060 default:
1061 return 0;
1062 }
1063
1064 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1065 mnt->auth_flavor_len = 1;
1066 return 1;
1067 }
1068
1069 static int nfs_parse_version_string(char *string,
1070 struct nfs_parsed_mount_data *mnt,
1071 substring_t *args)
1072 {
1073 mnt->flags &= ~NFS_MOUNT_VER3;
1074 switch (match_token(string, nfs_vers_tokens, args)) {
1075 case Opt_vers_2:
1076 mnt->version = 2;
1077 break;
1078 case Opt_vers_3:
1079 mnt->flags |= NFS_MOUNT_VER3;
1080 mnt->version = 3;
1081 break;
1082 case Opt_vers_4:
1083 /* Backward compatibility option. In future,
1084 * the mount program should always supply
1085 * a NFSv4 minor version number.
1086 */
1087 mnt->version = 4;
1088 break;
1089 case Opt_vers_4_0:
1090 mnt->version = 4;
1091 mnt->minorversion = 0;
1092 break;
1093 case Opt_vers_4_1:
1094 mnt->version = 4;
1095 mnt->minorversion = 1;
1096 break;
1097 default:
1098 return 0;
1099 }
1100 return 1;
1101 }
1102
1103 static int nfs_get_option_str(substring_t args[], char **option)
1104 {
1105 kfree(*option);
1106 *option = match_strdup(args);
1107 return !*option;
1108 }
1109
1110 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1111 {
1112 int rc;
1113 char *string;
1114
1115 string = match_strdup(args);
1116 if (string == NULL)
1117 return -ENOMEM;
1118 rc = kstrtoul(string, 10, option);
1119 kfree(string);
1120
1121 return rc;
1122 }
1123
1124 /*
1125 * Error-check and convert a string of mount options from user space into
1126 * a data structure. The whole mount string is processed; bad options are
1127 * skipped as they are encountered. If there were no errors, return 1;
1128 * otherwise return 0 (zero).
1129 */
1130 static int nfs_parse_mount_options(char *raw,
1131 struct nfs_parsed_mount_data *mnt)
1132 {
1133 char *p, *string, *secdata;
1134 int rc, sloppy = 0, invalid_option = 0;
1135 unsigned short protofamily = AF_UNSPEC;
1136 unsigned short mountfamily = AF_UNSPEC;
1137
1138 if (!raw) {
1139 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1140 return 1;
1141 }
1142 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1143
1144 secdata = alloc_secdata();
1145 if (!secdata)
1146 goto out_nomem;
1147
1148 rc = security_sb_copy_data(raw, secdata);
1149 if (rc)
1150 goto out_security_failure;
1151
1152 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1153 if (rc)
1154 goto out_security_failure;
1155
1156 free_secdata(secdata);
1157
1158 while ((p = strsep(&raw, ",")) != NULL) {
1159 substring_t args[MAX_OPT_ARGS];
1160 unsigned long option;
1161 int token;
1162
1163 if (!*p)
1164 continue;
1165
1166 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1167
1168 token = match_token(p, nfs_mount_option_tokens, args);
1169 switch (token) {
1170
1171 /*
1172 * boolean options: foo/nofoo
1173 */
1174 case Opt_soft:
1175 mnt->flags |= NFS_MOUNT_SOFT;
1176 break;
1177 case Opt_hard:
1178 mnt->flags &= ~NFS_MOUNT_SOFT;
1179 break;
1180 case Opt_posix:
1181 mnt->flags |= NFS_MOUNT_POSIX;
1182 break;
1183 case Opt_noposix:
1184 mnt->flags &= ~NFS_MOUNT_POSIX;
1185 break;
1186 case Opt_cto:
1187 mnt->flags &= ~NFS_MOUNT_NOCTO;
1188 break;
1189 case Opt_nocto:
1190 mnt->flags |= NFS_MOUNT_NOCTO;
1191 break;
1192 case Opt_ac:
1193 mnt->flags &= ~NFS_MOUNT_NOAC;
1194 break;
1195 case Opt_noac:
1196 mnt->flags |= NFS_MOUNT_NOAC;
1197 break;
1198 case Opt_lock:
1199 mnt->flags &= ~NFS_MOUNT_NONLM;
1200 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1201 NFS_MOUNT_LOCAL_FCNTL);
1202 break;
1203 case Opt_nolock:
1204 mnt->flags |= NFS_MOUNT_NONLM;
1205 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1206 NFS_MOUNT_LOCAL_FCNTL);
1207 break;
1208 case Opt_udp:
1209 mnt->flags &= ~NFS_MOUNT_TCP;
1210 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1211 break;
1212 case Opt_tcp:
1213 mnt->flags |= NFS_MOUNT_TCP;
1214 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1215 break;
1216 case Opt_rdma:
1217 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1218 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1219 xprt_load_transport(p);
1220 break;
1221 case Opt_acl:
1222 mnt->flags &= ~NFS_MOUNT_NOACL;
1223 break;
1224 case Opt_noacl:
1225 mnt->flags |= NFS_MOUNT_NOACL;
1226 break;
1227 case Opt_rdirplus:
1228 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1229 break;
1230 case Opt_nordirplus:
1231 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1232 break;
1233 case Opt_sharecache:
1234 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1235 break;
1236 case Opt_nosharecache:
1237 mnt->flags |= NFS_MOUNT_UNSHARED;
1238 break;
1239 case Opt_resvport:
1240 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1241 break;
1242 case Opt_noresvport:
1243 mnt->flags |= NFS_MOUNT_NORESVPORT;
1244 break;
1245 case Opt_fscache:
1246 mnt->options |= NFS_OPTION_FSCACHE;
1247 kfree(mnt->fscache_uniq);
1248 mnt->fscache_uniq = NULL;
1249 break;
1250 case Opt_nofscache:
1251 mnt->options &= ~NFS_OPTION_FSCACHE;
1252 kfree(mnt->fscache_uniq);
1253 mnt->fscache_uniq = NULL;
1254 break;
1255 case Opt_migration:
1256 mnt->options |= NFS_OPTION_MIGRATION;
1257 break;
1258 case Opt_nomigration:
1259 mnt->options &= NFS_OPTION_MIGRATION;
1260 break;
1261
1262 /*
1263 * options that take numeric values
1264 */
1265 case Opt_port:
1266 if (nfs_get_option_ul(args, &option) ||
1267 option > USHRT_MAX)
1268 goto out_invalid_value;
1269 mnt->nfs_server.port = option;
1270 break;
1271 case Opt_rsize:
1272 if (nfs_get_option_ul(args, &option))
1273 goto out_invalid_value;
1274 mnt->rsize = option;
1275 break;
1276 case Opt_wsize:
1277 if (nfs_get_option_ul(args, &option))
1278 goto out_invalid_value;
1279 mnt->wsize = option;
1280 break;
1281 case Opt_bsize:
1282 if (nfs_get_option_ul(args, &option))
1283 goto out_invalid_value;
1284 mnt->bsize = option;
1285 break;
1286 case Opt_timeo:
1287 if (nfs_get_option_ul(args, &option) || option == 0)
1288 goto out_invalid_value;
1289 mnt->timeo = option;
1290 break;
1291 case Opt_retrans:
1292 if (nfs_get_option_ul(args, &option) || option == 0)
1293 goto out_invalid_value;
1294 mnt->retrans = option;
1295 break;
1296 case Opt_acregmin:
1297 if (nfs_get_option_ul(args, &option))
1298 goto out_invalid_value;
1299 mnt->acregmin = option;
1300 break;
1301 case Opt_acregmax:
1302 if (nfs_get_option_ul(args, &option))
1303 goto out_invalid_value;
1304 mnt->acregmax = option;
1305 break;
1306 case Opt_acdirmin:
1307 if (nfs_get_option_ul(args, &option))
1308 goto out_invalid_value;
1309 mnt->acdirmin = option;
1310 break;
1311 case Opt_acdirmax:
1312 if (nfs_get_option_ul(args, &option))
1313 goto out_invalid_value;
1314 mnt->acdirmax = option;
1315 break;
1316 case Opt_actimeo:
1317 if (nfs_get_option_ul(args, &option))
1318 goto out_invalid_value;
1319 mnt->acregmin = mnt->acregmax =
1320 mnt->acdirmin = mnt->acdirmax = option;
1321 break;
1322 case Opt_namelen:
1323 if (nfs_get_option_ul(args, &option))
1324 goto out_invalid_value;
1325 mnt->namlen = option;
1326 break;
1327 case Opt_mountport:
1328 if (nfs_get_option_ul(args, &option) ||
1329 option > USHRT_MAX)
1330 goto out_invalid_value;
1331 mnt->mount_server.port = option;
1332 break;
1333 case Opt_mountvers:
1334 if (nfs_get_option_ul(args, &option) ||
1335 option < NFS_MNT_VERSION ||
1336 option > NFS_MNT3_VERSION)
1337 goto out_invalid_value;
1338 mnt->mount_server.version = option;
1339 break;
1340 case Opt_minorversion:
1341 if (nfs_get_option_ul(args, &option))
1342 goto out_invalid_value;
1343 if (option > NFS4_MAX_MINOR_VERSION)
1344 goto out_invalid_value;
1345 mnt->minorversion = option;
1346 break;
1347
1348 /*
1349 * options that take text values
1350 */
1351 case Opt_nfsvers:
1352 string = match_strdup(args);
1353 if (string == NULL)
1354 goto out_nomem;
1355 rc = nfs_parse_version_string(string, mnt, args);
1356 kfree(string);
1357 if (!rc)
1358 goto out_invalid_value;
1359 break;
1360 case Opt_sec:
1361 string = match_strdup(args);
1362 if (string == NULL)
1363 goto out_nomem;
1364 rc = nfs_parse_security_flavors(string, mnt);
1365 kfree(string);
1366 if (!rc) {
1367 dfprintk(MOUNT, "NFS: unrecognized "
1368 "security flavor\n");
1369 return 0;
1370 }
1371 break;
1372 case Opt_proto:
1373 string = match_strdup(args);
1374 if (string == NULL)
1375 goto out_nomem;
1376 token = match_token(string,
1377 nfs_xprt_protocol_tokens, args);
1378
1379 protofamily = AF_INET;
1380 switch (token) {
1381 case Opt_xprt_udp6:
1382 protofamily = AF_INET6;
1383 case Opt_xprt_udp:
1384 mnt->flags &= ~NFS_MOUNT_TCP;
1385 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1386 break;
1387 case Opt_xprt_tcp6:
1388 protofamily = AF_INET6;
1389 case Opt_xprt_tcp:
1390 mnt->flags |= NFS_MOUNT_TCP;
1391 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1392 break;
1393 case Opt_xprt_rdma:
1394 /* vector side protocols to TCP */
1395 mnt->flags |= NFS_MOUNT_TCP;
1396 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1397 xprt_load_transport(string);
1398 break;
1399 default:
1400 dfprintk(MOUNT, "NFS: unrecognized "
1401 "transport protocol\n");
1402 kfree(string);
1403 return 0;
1404 }
1405 kfree(string);
1406 break;
1407 case Opt_mountproto:
1408 string = match_strdup(args);
1409 if (string == NULL)
1410 goto out_nomem;
1411 token = match_token(string,
1412 nfs_xprt_protocol_tokens, args);
1413 kfree(string);
1414
1415 mountfamily = AF_INET;
1416 switch (token) {
1417 case Opt_xprt_udp6:
1418 mountfamily = AF_INET6;
1419 case Opt_xprt_udp:
1420 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1421 break;
1422 case Opt_xprt_tcp6:
1423 mountfamily = AF_INET6;
1424 case Opt_xprt_tcp:
1425 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1426 break;
1427 case Opt_xprt_rdma: /* not used for side protocols */
1428 default:
1429 dfprintk(MOUNT, "NFS: unrecognized "
1430 "transport protocol\n");
1431 return 0;
1432 }
1433 break;
1434 case Opt_addr:
1435 string = match_strdup(args);
1436 if (string == NULL)
1437 goto out_nomem;
1438 mnt->nfs_server.addrlen =
1439 rpc_pton(mnt->net, string, strlen(string),
1440 (struct sockaddr *)
1441 &mnt->nfs_server.address,
1442 sizeof(mnt->nfs_server.address));
1443 kfree(string);
1444 if (mnt->nfs_server.addrlen == 0)
1445 goto out_invalid_address;
1446 break;
1447 case Opt_clientaddr:
1448 if (nfs_get_option_str(args, &mnt->client_address))
1449 goto out_nomem;
1450 break;
1451 case Opt_mounthost:
1452 if (nfs_get_option_str(args,
1453 &mnt->mount_server.hostname))
1454 goto out_nomem;
1455 break;
1456 case Opt_mountaddr:
1457 string = match_strdup(args);
1458 if (string == NULL)
1459 goto out_nomem;
1460 mnt->mount_server.addrlen =
1461 rpc_pton(mnt->net, string, strlen(string),
1462 (struct sockaddr *)
1463 &mnt->mount_server.address,
1464 sizeof(mnt->mount_server.address));
1465 kfree(string);
1466 if (mnt->mount_server.addrlen == 0)
1467 goto out_invalid_address;
1468 break;
1469 case Opt_lookupcache:
1470 string = match_strdup(args);
1471 if (string == NULL)
1472 goto out_nomem;
1473 token = match_token(string,
1474 nfs_lookupcache_tokens, args);
1475 kfree(string);
1476 switch (token) {
1477 case Opt_lookupcache_all:
1478 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1479 break;
1480 case Opt_lookupcache_positive:
1481 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1482 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1483 break;
1484 case Opt_lookupcache_none:
1485 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1486 break;
1487 default:
1488 dfprintk(MOUNT, "NFS: invalid "
1489 "lookupcache argument\n");
1490 return 0;
1491 };
1492 break;
1493 case Opt_fscache_uniq:
1494 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1495 goto out_nomem;
1496 mnt->options |= NFS_OPTION_FSCACHE;
1497 break;
1498 case Opt_local_lock:
1499 string = match_strdup(args);
1500 if (string == NULL)
1501 goto out_nomem;
1502 token = match_token(string, nfs_local_lock_tokens,
1503 args);
1504 kfree(string);
1505 switch (token) {
1506 case Opt_local_lock_all:
1507 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1508 NFS_MOUNT_LOCAL_FCNTL);
1509 break;
1510 case Opt_local_lock_flock:
1511 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1512 break;
1513 case Opt_local_lock_posix:
1514 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1515 break;
1516 case Opt_local_lock_none:
1517 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1518 NFS_MOUNT_LOCAL_FCNTL);
1519 break;
1520 default:
1521 dfprintk(MOUNT, "NFS: invalid "
1522 "local_lock argument\n");
1523 return 0;
1524 };
1525 break;
1526
1527 /*
1528 * Special options
1529 */
1530 case Opt_sloppy:
1531 sloppy = 1;
1532 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1533 break;
1534 case Opt_userspace:
1535 case Opt_deprecated:
1536 dfprintk(MOUNT, "NFS: ignoring mount option "
1537 "'%s'\n", p);
1538 break;
1539
1540 default:
1541 invalid_option = 1;
1542 dfprintk(MOUNT, "NFS: unrecognized mount option "
1543 "'%s'\n", p);
1544 }
1545 }
1546
1547 if (!sloppy && invalid_option)
1548 return 0;
1549
1550 if (mnt->minorversion && mnt->version != 4)
1551 goto out_minorversion_mismatch;
1552
1553 if (mnt->options & NFS_OPTION_MIGRATION &&
1554 mnt->version != 4 && mnt->minorversion != 0)
1555 goto out_migration_misuse;
1556
1557 /*
1558 * verify that any proto=/mountproto= options match the address
1559 * families in the addr=/mountaddr= options.
1560 */
1561 if (protofamily != AF_UNSPEC &&
1562 protofamily != mnt->nfs_server.address.ss_family)
1563 goto out_proto_mismatch;
1564
1565 if (mountfamily != AF_UNSPEC) {
1566 if (mnt->mount_server.addrlen) {
1567 if (mountfamily != mnt->mount_server.address.ss_family)
1568 goto out_mountproto_mismatch;
1569 } else {
1570 if (mountfamily != mnt->nfs_server.address.ss_family)
1571 goto out_mountproto_mismatch;
1572 }
1573 }
1574
1575 return 1;
1576
1577 out_mountproto_mismatch:
1578 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1579 "option\n");
1580 return 0;
1581 out_proto_mismatch:
1582 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1583 return 0;
1584 out_invalid_address:
1585 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1586 return 0;
1587 out_invalid_value:
1588 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1589 return 0;
1590 out_minorversion_mismatch:
1591 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1592 "minorversion=%u\n", mnt->version, mnt->minorversion);
1593 return 0;
1594 out_migration_misuse:
1595 printk(KERN_INFO
1596 "NFS: 'migration' not supported for this NFS version\n");
1597 return 0;
1598 out_nomem:
1599 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1600 return 0;
1601 out_security_failure:
1602 free_secdata(secdata);
1603 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1604 return 0;
1605 }
1606
1607 /*
1608 * Select a security flavor for this mount. The selected flavor
1609 * is planted in args->auth_flavors[0].
1610 */
1611 static void nfs_select_flavor(struct nfs_parsed_mount_data *args,
1612 struct nfs_mount_request *request)
1613 {
1614 unsigned int i, count = *(request->auth_flav_len);
1615 rpc_authflavor_t flavor;
1616
1617 if (args->auth_flavors[0] != RPC_AUTH_MAXFLAVOR)
1618 goto out;
1619
1620 /*
1621 * The NFSv2 MNT operation does not return a flavor list.
1622 */
1623 if (args->mount_server.version != NFS_MNT3_VERSION)
1624 goto out_default;
1625
1626 /*
1627 * Certain releases of Linux's mountd return an empty
1628 * flavor list in some cases.
1629 */
1630 if (count == 0)
1631 goto out_default;
1632
1633 /*
1634 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1635 * flavor listed first. However, some servers list
1636 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1637 */
1638 for (i = 0; i < count; i++) {
1639 struct rpcsec_gss_info info;
1640
1641 flavor = request->auth_flavs[i];
1642 switch (flavor) {
1643 case RPC_AUTH_UNIX:
1644 goto out_set;
1645 case RPC_AUTH_NULL:
1646 continue;
1647 default:
1648 if (rpcauth_get_gssinfo(flavor, &info) == 0)
1649 goto out_set;
1650 }
1651 }
1652
1653 out_default:
1654 flavor = RPC_AUTH_UNIX;
1655 out_set:
1656 args->auth_flavors[0] = flavor;
1657 out:
1658 dfprintk(MOUNT, "NFS: using auth flavor %d\n", args->auth_flavors[0]);
1659 }
1660
1661 /*
1662 * Use the remote server's MOUNT service to request the NFS file handle
1663 * corresponding to the provided path.
1664 */
1665 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1666 struct nfs_fh *root_fh)
1667 {
1668 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1669 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1670 struct nfs_mount_request request = {
1671 .sap = (struct sockaddr *)
1672 &args->mount_server.address,
1673 .dirpath = args->nfs_server.export_path,
1674 .protocol = args->mount_server.protocol,
1675 .fh = root_fh,
1676 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1677 .auth_flav_len = &server_authlist_len,
1678 .auth_flavs = server_authlist,
1679 .net = args->net,
1680 };
1681 int status;
1682
1683 if (args->mount_server.version == 0) {
1684 switch (args->version) {
1685 default:
1686 args->mount_server.version = NFS_MNT3_VERSION;
1687 break;
1688 case 2:
1689 args->mount_server.version = NFS_MNT_VERSION;
1690 }
1691 }
1692 request.version = args->mount_server.version;
1693
1694 if (args->mount_server.hostname)
1695 request.hostname = args->mount_server.hostname;
1696 else
1697 request.hostname = args->nfs_server.hostname;
1698
1699 /*
1700 * Construct the mount server's address.
1701 */
1702 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1703 memcpy(request.sap, &args->nfs_server.address,
1704 args->nfs_server.addrlen);
1705 args->mount_server.addrlen = args->nfs_server.addrlen;
1706 }
1707 request.salen = args->mount_server.addrlen;
1708 nfs_set_port(request.sap, &args->mount_server.port, 0);
1709
1710 /*
1711 * Now ask the mount server to map our export path
1712 * to a file handle.
1713 */
1714 status = nfs_mount(&request);
1715 if (status != 0) {
1716 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1717 request.hostname, status);
1718 return status;
1719 }
1720
1721 nfs_select_flavor(args, &request);
1722 return 0;
1723 }
1724
1725 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1726 struct nfs_mount_info *mount_info,
1727 struct nfs_subversion *nfs_mod)
1728 {
1729 int status;
1730 struct nfs_server *server;
1731
1732 if (mount_info->parsed->need_mount) {
1733 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1734 if (status)
1735 return ERR_PTR(status);
1736 }
1737
1738 /* Get a volume representation */
1739 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1740 if (IS_ERR(server))
1741 return ERR_CAST(server);
1742
1743 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1744 }
1745 EXPORT_SYMBOL_GPL(nfs_try_mount);
1746
1747 /*
1748 * Split "dev_name" into "hostname:export_path".
1749 *
1750 * The leftmost colon demarks the split between the server's hostname
1751 * and the export path. If the hostname starts with a left square
1752 * bracket, then it may contain colons.
1753 *
1754 * Note: caller frees hostname and export path, even on error.
1755 */
1756 static int nfs_parse_devname(const char *dev_name,
1757 char **hostname, size_t maxnamlen,
1758 char **export_path, size_t maxpathlen)
1759 {
1760 size_t len;
1761 char *end;
1762
1763 /* Is the host name protected with square brakcets? */
1764 if (*dev_name == '[') {
1765 end = strchr(++dev_name, ']');
1766 if (end == NULL || end[1] != ':')
1767 goto out_bad_devname;
1768
1769 len = end - dev_name;
1770 end++;
1771 } else {
1772 char *comma;
1773
1774 end = strchr(dev_name, ':');
1775 if (end == NULL)
1776 goto out_bad_devname;
1777 len = end - dev_name;
1778
1779 /* kill possible hostname list: not supported */
1780 comma = strchr(dev_name, ',');
1781 if (comma != NULL && comma < end)
1782 *comma = 0;
1783 }
1784
1785 if (len > maxnamlen)
1786 goto out_hostname;
1787
1788 /* N.B. caller will free nfs_server.hostname in all cases */
1789 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1790 if (*hostname == NULL)
1791 goto out_nomem;
1792 len = strlen(++end);
1793 if (len > maxpathlen)
1794 goto out_path;
1795 *export_path = kstrndup(end, len, GFP_KERNEL);
1796 if (!*export_path)
1797 goto out_nomem;
1798
1799 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1800 return 0;
1801
1802 out_bad_devname:
1803 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1804 return -EINVAL;
1805
1806 out_nomem:
1807 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1808 return -ENOMEM;
1809
1810 out_hostname:
1811 dfprintk(MOUNT, "NFS: server hostname too long\n");
1812 return -ENAMETOOLONG;
1813
1814 out_path:
1815 dfprintk(MOUNT, "NFS: export pathname too long\n");
1816 return -ENAMETOOLONG;
1817 }
1818
1819 /*
1820 * Validate the NFS2/NFS3 mount data
1821 * - fills in the mount root filehandle
1822 *
1823 * For option strings, user space handles the following behaviors:
1824 *
1825 * + DNS: mapping server host name to IP address ("addr=" option)
1826 *
1827 * + failure mode: how to behave if a mount request can't be handled
1828 * immediately ("fg/bg" option)
1829 *
1830 * + retry: how often to retry a mount request ("retry=" option)
1831 *
1832 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1833 * mountproto=tcp after mountproto=udp, and so on
1834 */
1835 static int nfs23_validate_mount_data(void *options,
1836 struct nfs_parsed_mount_data *args,
1837 struct nfs_fh *mntfh,
1838 const char *dev_name)
1839 {
1840 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1841 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1842
1843 if (data == NULL)
1844 goto out_no_data;
1845
1846 args->version = NFS_DEFAULT_VERSION;
1847 switch (data->version) {
1848 case 1:
1849 data->namlen = 0;
1850 case 2:
1851 data->bsize = 0;
1852 case 3:
1853 if (data->flags & NFS_MOUNT_VER3)
1854 goto out_no_v3;
1855 data->root.size = NFS2_FHSIZE;
1856 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1857 case 4:
1858 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1859 goto out_no_sec;
1860 case 5:
1861 memset(data->context, 0, sizeof(data->context));
1862 case 6:
1863 if (data->flags & NFS_MOUNT_VER3) {
1864 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1865 goto out_invalid_fh;
1866 mntfh->size = data->root.size;
1867 args->version = 3;
1868 } else {
1869 mntfh->size = NFS2_FHSIZE;
1870 args->version = 2;
1871 }
1872
1873
1874 memcpy(mntfh->data, data->root.data, mntfh->size);
1875 if (mntfh->size < sizeof(mntfh->data))
1876 memset(mntfh->data + mntfh->size, 0,
1877 sizeof(mntfh->data) - mntfh->size);
1878
1879 /*
1880 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1881 * can deal with.
1882 */
1883 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1884 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1885 args->rsize = data->rsize;
1886 args->wsize = data->wsize;
1887 args->timeo = data->timeo;
1888 args->retrans = data->retrans;
1889 args->acregmin = data->acregmin;
1890 args->acregmax = data->acregmax;
1891 args->acdirmin = data->acdirmin;
1892 args->acdirmax = data->acdirmax;
1893 args->need_mount = false;
1894
1895 memcpy(sap, &data->addr, sizeof(data->addr));
1896 args->nfs_server.addrlen = sizeof(data->addr);
1897 args->nfs_server.port = ntohs(data->addr.sin_port);
1898 if (!nfs_verify_server_address(sap))
1899 goto out_no_address;
1900
1901 if (!(data->flags & NFS_MOUNT_TCP))
1902 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1903 /* N.B. caller will free nfs_server.hostname in all cases */
1904 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1905 args->namlen = data->namlen;
1906 args->bsize = data->bsize;
1907
1908 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1909 args->auth_flavors[0] = data->pseudoflavor;
1910 if (!args->nfs_server.hostname)
1911 goto out_nomem;
1912
1913 if (!(data->flags & NFS_MOUNT_NONLM))
1914 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1915 NFS_MOUNT_LOCAL_FCNTL);
1916 else
1917 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1918 NFS_MOUNT_LOCAL_FCNTL);
1919 /*
1920 * The legacy version 6 binary mount data from userspace has a
1921 * field used only to transport selinux information into the
1922 * the kernel. To continue to support that functionality we
1923 * have a touch of selinux knowledge here in the NFS code. The
1924 * userspace code converted context=blah to just blah so we are
1925 * converting back to the full string selinux understands.
1926 */
1927 if (data->context[0]){
1928 #ifdef CONFIG_SECURITY_SELINUX
1929 int rc;
1930 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1931 if (!opts_str)
1932 return -ENOMEM;
1933 strcpy(opts_str, "context=");
1934 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1935 strcat(opts_str, &data->context[0]);
1936 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1937 kfree(opts_str);
1938 if (rc)
1939 return rc;
1940 #else
1941 return -EINVAL;
1942 #endif
1943 }
1944
1945 break;
1946 default:
1947 return NFS_TEXT_DATA;
1948 }
1949
1950 #if !IS_ENABLED(CONFIG_NFS_V3)
1951 if (args->version == 3)
1952 goto out_v3_not_compiled;
1953 #endif /* !CONFIG_NFS_V3 */
1954
1955 return 0;
1956
1957 out_no_data:
1958 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1959 return -EINVAL;
1960
1961 out_no_v3:
1962 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1963 data->version);
1964 return -EINVAL;
1965
1966 out_no_sec:
1967 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1968 return -EINVAL;
1969
1970 #if !IS_ENABLED(CONFIG_NFS_V3)
1971 out_v3_not_compiled:
1972 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1973 return -EPROTONOSUPPORT;
1974 #endif /* !CONFIG_NFS_V3 */
1975
1976 out_nomem:
1977 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1978 return -ENOMEM;
1979
1980 out_no_address:
1981 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1982 return -EINVAL;
1983
1984 out_invalid_fh:
1985 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1986 return -EINVAL;
1987 }
1988
1989 #if IS_ENABLED(CONFIG_NFS_V4)
1990 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1991 void *options,
1992 struct nfs_parsed_mount_data *args,
1993 struct nfs_fh *mntfh,
1994 const char *dev_name)
1995 {
1996 if (fs_type == &nfs_fs_type)
1997 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1998 return nfs4_validate_mount_data(options, args, dev_name);
1999 }
2000 #else
2001 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2002 void *options,
2003 struct nfs_parsed_mount_data *args,
2004 struct nfs_fh *mntfh,
2005 const char *dev_name)
2006 {
2007 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2008 }
2009 #endif
2010
2011 static int nfs_validate_text_mount_data(void *options,
2012 struct nfs_parsed_mount_data *args,
2013 const char *dev_name)
2014 {
2015 int port = 0;
2016 int max_namelen = PAGE_SIZE;
2017 int max_pathlen = NFS_MAXPATHLEN;
2018 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2019
2020 if (nfs_parse_mount_options((char *)options, args) == 0)
2021 return -EINVAL;
2022
2023 if (!nfs_verify_server_address(sap))
2024 goto out_no_address;
2025
2026 if (args->version == 4) {
2027 #if IS_ENABLED(CONFIG_NFS_V4)
2028 port = NFS_PORT;
2029 max_namelen = NFS4_MAXNAMLEN;
2030 max_pathlen = NFS4_MAXPATHLEN;
2031 nfs_validate_transport_protocol(args);
2032 nfs4_validate_mount_flags(args);
2033 #else
2034 goto out_v4_not_compiled;
2035 #endif /* CONFIG_NFS_V4 */
2036 } else
2037 nfs_set_mount_transport_protocol(args);
2038
2039 nfs_set_port(sap, &args->nfs_server.port, port);
2040
2041 if (args->auth_flavor_len > 1)
2042 goto out_bad_auth;
2043
2044 return nfs_parse_devname(dev_name,
2045 &args->nfs_server.hostname,
2046 max_namelen,
2047 &args->nfs_server.export_path,
2048 max_pathlen);
2049
2050 #if !IS_ENABLED(CONFIG_NFS_V4)
2051 out_v4_not_compiled:
2052 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2053 return -EPROTONOSUPPORT;
2054 #endif /* !CONFIG_NFS_V4 */
2055
2056 out_no_address:
2057 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2058 return -EINVAL;
2059
2060 out_bad_auth:
2061 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2062 return -EINVAL;
2063 }
2064
2065 static int
2066 nfs_compare_remount_data(struct nfs_server *nfss,
2067 struct nfs_parsed_mount_data *data)
2068 {
2069 if (data->flags != nfss->flags ||
2070 data->rsize != nfss->rsize ||
2071 data->wsize != nfss->wsize ||
2072 data->retrans != nfss->client->cl_timeout->to_retries ||
2073 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2074 data->acregmin != nfss->acregmin / HZ ||
2075 data->acregmax != nfss->acregmax / HZ ||
2076 data->acdirmin != nfss->acdirmin / HZ ||
2077 data->acdirmax != nfss->acdirmax / HZ ||
2078 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2079 data->nfs_server.port != nfss->port ||
2080 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2081 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2082 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2083 return -EINVAL;
2084
2085 return 0;
2086 }
2087
2088 int
2089 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2090 {
2091 int error;
2092 struct nfs_server *nfss = sb->s_fs_info;
2093 struct nfs_parsed_mount_data *data;
2094 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2095 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2096 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2097
2098 /*
2099 * Userspace mount programs that send binary options generally send
2100 * them populated with default values. We have no way to know which
2101 * ones were explicitly specified. Fall back to legacy behavior and
2102 * just return success.
2103 */
2104 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2105 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2106 options->version <= 6))))
2107 return 0;
2108
2109 data = kzalloc(sizeof(*data), GFP_KERNEL);
2110 if (data == NULL)
2111 return -ENOMEM;
2112
2113 /* fill out struct with values from existing mount */
2114 data->flags = nfss->flags;
2115 data->rsize = nfss->rsize;
2116 data->wsize = nfss->wsize;
2117 data->retrans = nfss->client->cl_timeout->to_retries;
2118 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2119 data->acregmin = nfss->acregmin / HZ;
2120 data->acregmax = nfss->acregmax / HZ;
2121 data->acdirmin = nfss->acdirmin / HZ;
2122 data->acdirmax = nfss->acdirmax / HZ;
2123 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2124 data->nfs_server.port = nfss->port;
2125 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2126 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2127 data->nfs_server.addrlen);
2128
2129 /* overwrite those values with any that were specified */
2130 error = nfs_parse_mount_options((char *)options, data);
2131 if (error < 0)
2132 goto out;
2133
2134 /*
2135 * noac is a special case. It implies -o sync, but that's not
2136 * necessarily reflected in the mtab options. do_remount_sb
2137 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2138 * remount options, so we have to explicitly reset it.
2139 */
2140 if (data->flags & NFS_MOUNT_NOAC)
2141 *flags |= MS_SYNCHRONOUS;
2142
2143 /* compare new mount options with old ones */
2144 error = nfs_compare_remount_data(nfss, data);
2145 out:
2146 kfree(data);
2147 return error;
2148 }
2149 EXPORT_SYMBOL_GPL(nfs_remount);
2150
2151 /*
2152 * Initialise the common bits of the superblock
2153 */
2154 inline void nfs_initialise_sb(struct super_block *sb)
2155 {
2156 struct nfs_server *server = NFS_SB(sb);
2157
2158 sb->s_magic = NFS_SUPER_MAGIC;
2159
2160 /* We probably want something more informative here */
2161 snprintf(sb->s_id, sizeof(sb->s_id),
2162 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2163
2164 if (sb->s_blocksize == 0)
2165 sb->s_blocksize = nfs_block_bits(server->wsize,
2166 &sb->s_blocksize_bits);
2167
2168 sb->s_bdi = &server->backing_dev_info;
2169
2170 nfs_super_set_maxbytes(sb, server->maxfilesize);
2171 }
2172
2173 /*
2174 * Finish setting up an NFS2/3 superblock
2175 */
2176 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2177 {
2178 struct nfs_parsed_mount_data *data = mount_info->parsed;
2179 struct nfs_server *server = NFS_SB(sb);
2180
2181 sb->s_blocksize_bits = 0;
2182 sb->s_blocksize = 0;
2183 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2184 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2185 if (data && data->bsize)
2186 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2187
2188 if (server->nfs_client->rpc_ops->version != 2) {
2189 /* The VFS shouldn't apply the umask to mode bits. We will do
2190 * so ourselves when necessary.
2191 */
2192 sb->s_flags |= MS_POSIXACL;
2193 sb->s_time_gran = 1;
2194 }
2195
2196 nfs_initialise_sb(sb);
2197 }
2198 EXPORT_SYMBOL_GPL(nfs_fill_super);
2199
2200 /*
2201 * Finish setting up a cloned NFS2/3/4 superblock
2202 */
2203 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2204 {
2205 const struct super_block *old_sb = mount_info->cloned->sb;
2206 struct nfs_server *server = NFS_SB(sb);
2207
2208 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2209 sb->s_blocksize = old_sb->s_blocksize;
2210 sb->s_maxbytes = old_sb->s_maxbytes;
2211 sb->s_xattr = old_sb->s_xattr;
2212 sb->s_op = old_sb->s_op;
2213 sb->s_time_gran = 1;
2214
2215 if (server->nfs_client->rpc_ops->version != 2) {
2216 /* The VFS shouldn't apply the umask to mode bits. We will do
2217 * so ourselves when necessary.
2218 */
2219 sb->s_flags |= MS_POSIXACL;
2220 }
2221
2222 nfs_initialise_sb(sb);
2223 }
2224
2225 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2226 {
2227 const struct nfs_server *a = s->s_fs_info;
2228 const struct rpc_clnt *clnt_a = a->client;
2229 const struct rpc_clnt *clnt_b = b->client;
2230
2231 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2232 goto Ebusy;
2233 if (a->nfs_client != b->nfs_client)
2234 goto Ebusy;
2235 if (a->flags != b->flags)
2236 goto Ebusy;
2237 if (a->wsize != b->wsize)
2238 goto Ebusy;
2239 if (a->rsize != b->rsize)
2240 goto Ebusy;
2241 if (a->acregmin != b->acregmin)
2242 goto Ebusy;
2243 if (a->acregmax != b->acregmax)
2244 goto Ebusy;
2245 if (a->acdirmin != b->acdirmin)
2246 goto Ebusy;
2247 if (a->acdirmax != b->acdirmax)
2248 goto Ebusy;
2249 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2250 goto Ebusy;
2251 return 1;
2252 Ebusy:
2253 return 0;
2254 }
2255
2256 struct nfs_sb_mountdata {
2257 struct nfs_server *server;
2258 int mntflags;
2259 };
2260
2261 static int nfs_set_super(struct super_block *s, void *data)
2262 {
2263 struct nfs_sb_mountdata *sb_mntdata = data;
2264 struct nfs_server *server = sb_mntdata->server;
2265 int ret;
2266
2267 s->s_flags = sb_mntdata->mntflags;
2268 s->s_fs_info = server;
2269 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2270 ret = set_anon_super(s, server);
2271 if (ret == 0)
2272 server->s_dev = s->s_dev;
2273 return ret;
2274 }
2275
2276 static int nfs_compare_super_address(struct nfs_server *server1,
2277 struct nfs_server *server2)
2278 {
2279 struct sockaddr *sap1, *sap2;
2280
2281 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2282 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2283
2284 if (sap1->sa_family != sap2->sa_family)
2285 return 0;
2286
2287 switch (sap1->sa_family) {
2288 case AF_INET: {
2289 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2290 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2291 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2292 return 0;
2293 if (sin1->sin_port != sin2->sin_port)
2294 return 0;
2295 break;
2296 }
2297 case AF_INET6: {
2298 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2299 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2300 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2301 return 0;
2302 if (sin1->sin6_port != sin2->sin6_port)
2303 return 0;
2304 break;
2305 }
2306 default:
2307 return 0;
2308 }
2309
2310 return 1;
2311 }
2312
2313 static int nfs_compare_super(struct super_block *sb, void *data)
2314 {
2315 struct nfs_sb_mountdata *sb_mntdata = data;
2316 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2317 int mntflags = sb_mntdata->mntflags;
2318
2319 if (!nfs_compare_super_address(old, server))
2320 return 0;
2321 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2322 if (old->flags & NFS_MOUNT_UNSHARED)
2323 return 0;
2324 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2325 return 0;
2326 return nfs_compare_mount_options(sb, server, mntflags);
2327 }
2328
2329 #ifdef CONFIG_NFS_FSCACHE
2330 static void nfs_get_cache_cookie(struct super_block *sb,
2331 struct nfs_parsed_mount_data *parsed,
2332 struct nfs_clone_mount *cloned)
2333 {
2334 struct nfs_server *nfss = NFS_SB(sb);
2335 char *uniq = NULL;
2336 int ulen = 0;
2337
2338 nfss->fscache_key = NULL;
2339 nfss->fscache = NULL;
2340
2341 if (parsed) {
2342 if (!(parsed->options & NFS_OPTION_FSCACHE))
2343 return;
2344 if (parsed->fscache_uniq) {
2345 uniq = parsed->fscache_uniq;
2346 ulen = strlen(parsed->fscache_uniq);
2347 }
2348 } else if (cloned) {
2349 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2350 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2351 return;
2352 if (mnt_s->fscache_key) {
2353 uniq = mnt_s->fscache_key->key.uniquifier;
2354 ulen = mnt_s->fscache_key->key.uniq_len;
2355 };
2356 } else
2357 return;
2358
2359 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2360 }
2361 #else
2362 static void nfs_get_cache_cookie(struct super_block *sb,
2363 struct nfs_parsed_mount_data *parsed,
2364 struct nfs_clone_mount *cloned)
2365 {
2366 }
2367 #endif
2368
2369 static int nfs_bdi_register(struct nfs_server *server)
2370 {
2371 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2372 }
2373
2374 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2375 struct nfs_mount_info *mount_info)
2376 {
2377 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2378 }
2379 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2380
2381 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2382 struct nfs_mount_info *mount_info)
2383 {
2384 /* clone any lsm security options from the parent to the new sb */
2385 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2386 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2387 return -ESTALE;
2388 return 0;
2389 }
2390 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2391
2392 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2393 int flags, const char *dev_name,
2394 struct nfs_mount_info *mount_info,
2395 struct nfs_subversion *nfs_mod)
2396 {
2397 struct super_block *s;
2398 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2399 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2400 struct nfs_sb_mountdata sb_mntdata = {
2401 .mntflags = flags,
2402 .server = server,
2403 };
2404 int error;
2405
2406 if (server->flags & NFS_MOUNT_UNSHARED)
2407 compare_super = NULL;
2408
2409 /* -o noac implies -o sync */
2410 if (server->flags & NFS_MOUNT_NOAC)
2411 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2412
2413 /* Get a superblock - note that we may end up sharing one that already exists */
2414 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2415 if (IS_ERR(s)) {
2416 mntroot = ERR_CAST(s);
2417 goto out_err_nosb;
2418 }
2419
2420 if (s->s_fs_info != server) {
2421 nfs_free_server(server);
2422 server = NULL;
2423 } else {
2424 error = nfs_bdi_register(server);
2425 if (error) {
2426 mntroot = ERR_PTR(error);
2427 goto error_splat_bdi;
2428 }
2429 }
2430
2431 if (!s->s_root) {
2432 /* initial superblock/root creation */
2433 mount_info->fill_super(s, mount_info);
2434 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2435 }
2436
2437 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2438 if (IS_ERR(mntroot))
2439 goto error_splat_super;
2440
2441 error = mount_info->set_security(s, mntroot, mount_info);
2442 if (error)
2443 goto error_splat_root;
2444
2445 s->s_flags |= MS_ACTIVE;
2446
2447 out:
2448 return mntroot;
2449
2450 out_err_nosb:
2451 nfs_free_server(server);
2452 goto out;
2453
2454 error_splat_root:
2455 dput(mntroot);
2456 mntroot = ERR_PTR(error);
2457 error_splat_super:
2458 if (server && !s->s_root)
2459 bdi_unregister(&server->backing_dev_info);
2460 error_splat_bdi:
2461 deactivate_locked_super(s);
2462 goto out;
2463 }
2464 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2465
2466 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2467 int flags, const char *dev_name, void *raw_data)
2468 {
2469 struct nfs_mount_info mount_info = {
2470 .fill_super = nfs_fill_super,
2471 .set_security = nfs_set_sb_security,
2472 };
2473 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2474 struct nfs_subversion *nfs_mod;
2475 int error;
2476
2477 mount_info.parsed = nfs_alloc_parsed_mount_data();
2478 mount_info.mntfh = nfs_alloc_fhandle();
2479 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2480 goto out;
2481
2482 /* Validate the mount data */
2483 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2484 if (error == NFS_TEXT_DATA)
2485 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2486 if (error < 0) {
2487 mntroot = ERR_PTR(error);
2488 goto out;
2489 }
2490
2491 nfs_mod = get_nfs_version(mount_info.parsed->version);
2492 if (IS_ERR(nfs_mod)) {
2493 mntroot = ERR_CAST(nfs_mod);
2494 goto out;
2495 }
2496
2497 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2498
2499 put_nfs_version(nfs_mod);
2500 out:
2501 nfs_free_parsed_mount_data(mount_info.parsed);
2502 nfs_free_fhandle(mount_info.mntfh);
2503 return mntroot;
2504 }
2505 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2506
2507 /*
2508 * Ensure that we unregister the bdi before kill_anon_super
2509 * releases the device name
2510 */
2511 void nfs_put_super(struct super_block *s)
2512 {
2513 struct nfs_server *server = NFS_SB(s);
2514
2515 bdi_unregister(&server->backing_dev_info);
2516 }
2517 EXPORT_SYMBOL_GPL(nfs_put_super);
2518
2519 /*
2520 * Destroy an NFS2/3 superblock
2521 */
2522 void nfs_kill_super(struct super_block *s)
2523 {
2524 struct nfs_server *server = NFS_SB(s);
2525
2526 kill_anon_super(s);
2527 nfs_fscache_release_super_cookie(s);
2528 nfs_free_server(server);
2529 }
2530 EXPORT_SYMBOL_GPL(nfs_kill_super);
2531
2532 /*
2533 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2534 */
2535 static struct dentry *
2536 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2537 const char *dev_name, void *raw_data)
2538 {
2539 struct nfs_clone_mount *data = raw_data;
2540 struct nfs_mount_info mount_info = {
2541 .fill_super = nfs_clone_super,
2542 .set_security = nfs_clone_sb_security,
2543 .cloned = data,
2544 };
2545 struct nfs_server *server;
2546 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2547 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2548
2549 dprintk("--> nfs_xdev_mount()\n");
2550
2551 mount_info.mntfh = mount_info.cloned->fh;
2552
2553 /* create a new volume representation */
2554 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2555
2556 if (IS_ERR(server))
2557 mntroot = ERR_CAST(server);
2558 else
2559 mntroot = nfs_fs_mount_common(server, flags,
2560 dev_name, &mount_info, nfs_mod);
2561
2562 dprintk("<-- nfs_xdev_mount() = %ld\n",
2563 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2564 return mntroot;
2565 }
2566
2567 #if IS_ENABLED(CONFIG_NFS_V4)
2568
2569 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2570 {
2571 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2572 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2573 }
2574
2575 /*
2576 * Validate NFSv4 mount options
2577 */
2578 static int nfs4_validate_mount_data(void *options,
2579 struct nfs_parsed_mount_data *args,
2580 const char *dev_name)
2581 {
2582 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2583 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2584 char *c;
2585
2586 if (data == NULL)
2587 goto out_no_data;
2588
2589 args->version = 4;
2590
2591 switch (data->version) {
2592 case 1:
2593 if (data->host_addrlen > sizeof(args->nfs_server.address))
2594 goto out_no_address;
2595 if (data->host_addrlen == 0)
2596 goto out_no_address;
2597 args->nfs_server.addrlen = data->host_addrlen;
2598 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2599 return -EFAULT;
2600 if (!nfs_verify_server_address(sap))
2601 goto out_no_address;
2602 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2603
2604 if (data->auth_flavourlen) {
2605 if (data->auth_flavourlen > 1)
2606 goto out_inval_auth;
2607 if (copy_from_user(&args->auth_flavors[0],
2608 data->auth_flavours,
2609 sizeof(args->auth_flavors[0])))
2610 return -EFAULT;
2611 }
2612
2613 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2614 if (IS_ERR(c))
2615 return PTR_ERR(c);
2616 args->nfs_server.hostname = c;
2617
2618 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2619 if (IS_ERR(c))
2620 return PTR_ERR(c);
2621 args->nfs_server.export_path = c;
2622 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2623
2624 c = strndup_user(data->client_addr.data, 16);
2625 if (IS_ERR(c))
2626 return PTR_ERR(c);
2627 args->client_address = c;
2628
2629 /*
2630 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2631 * can deal with.
2632 */
2633
2634 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2635 args->rsize = data->rsize;
2636 args->wsize = data->wsize;
2637 args->timeo = data->timeo;
2638 args->retrans = data->retrans;
2639 args->acregmin = data->acregmin;
2640 args->acregmax = data->acregmax;
2641 args->acdirmin = data->acdirmin;
2642 args->acdirmax = data->acdirmax;
2643 args->nfs_server.protocol = data->proto;
2644 nfs_validate_transport_protocol(args);
2645
2646 break;
2647 default:
2648 return NFS_TEXT_DATA;
2649 }
2650
2651 return 0;
2652
2653 out_no_data:
2654 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2655 return -EINVAL;
2656
2657 out_inval_auth:
2658 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2659 data->auth_flavourlen);
2660 return -EINVAL;
2661
2662 out_no_address:
2663 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2664 return -EINVAL;
2665 }
2666
2667 /*
2668 * NFS v4 module parameters need to stay in the
2669 * NFS client for backwards compatibility
2670 */
2671 unsigned int nfs_callback_set_tcpport;
2672 unsigned short nfs_callback_tcpport;
2673 /* Default cache timeout is 10 minutes */
2674 unsigned int nfs_idmap_cache_timeout = 600;
2675 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2676 bool nfs4_disable_idmapping = true;
2677 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2678 unsigned short send_implementation_id = 1;
2679 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2680
2681 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2682 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2683 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2684 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2685 EXPORT_SYMBOL_GPL(max_session_slots);
2686 EXPORT_SYMBOL_GPL(send_implementation_id);
2687 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2688
2689 #define NFS_CALLBACK_MAXPORTNR (65535U)
2690
2691 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2692 {
2693 unsigned long num;
2694 int ret;
2695
2696 if (!val)
2697 return -EINVAL;
2698 ret = kstrtoul(val, 0, &num);
2699 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2700 return -EINVAL;
2701 *((unsigned int *)kp->arg) = num;
2702 return 0;
2703 }
2704 static struct kernel_param_ops param_ops_portnr = {
2705 .set = param_set_portnr,
2706 .get = param_get_uint,
2707 };
2708 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2709
2710 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2711 module_param(nfs_idmap_cache_timeout, int, 0644);
2712 module_param(nfs4_disable_idmapping, bool, 0644);
2713 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2714 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2715 MODULE_PARM_DESC(nfs4_disable_idmapping,
2716 "Turn off NFSv4 idmapping when using 'sec=sys'");
2717 module_param(max_session_slots, ushort, 0644);
2718 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2719 "requests the client will negotiate");
2720 module_param(send_implementation_id, ushort, 0644);
2721 MODULE_PARM_DESC(send_implementation_id,
2722 "Send implementation ID with NFSv4.1 exchange_id");
2723 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2724 MODULE_ALIAS("nfs4");
2725
2726 #endif /* CONFIG_NFS_V4 */
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