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powerpc: Rename USER_ESID_BITS* to ESID_BITS*
[deliverable/linux.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 MODULE_ALIAS_FS("nfs");
298 EXPORT_SYMBOL_GPL(nfs_fs_type);
299
300 struct file_system_type nfs_xdev_fs_type = {
301 .owner = THIS_MODULE,
302 .name = "nfs",
303 .mount = nfs_xdev_mount,
304 .kill_sb = nfs_kill_super,
305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
306 };
307
308 const struct super_operations nfs_sops = {
309 .alloc_inode = nfs_alloc_inode,
310 .destroy_inode = nfs_destroy_inode,
311 .write_inode = nfs_write_inode,
312 .drop_inode = nfs_drop_inode,
313 .put_super = nfs_put_super,
314 .statfs = nfs_statfs,
315 .evict_inode = nfs_evict_inode,
316 .umount_begin = nfs_umount_begin,
317 .show_options = nfs_show_options,
318 .show_devname = nfs_show_devname,
319 .show_path = nfs_show_path,
320 .show_stats = nfs_show_stats,
321 .remount_fs = nfs_remount,
322 };
323 EXPORT_SYMBOL_GPL(nfs_sops);
324
325 #if IS_ENABLED(CONFIG_NFS_V4)
326 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
327 static int nfs4_validate_mount_data(void *options,
328 struct nfs_parsed_mount_data *args, const char *dev_name);
329
330 struct file_system_type nfs4_fs_type = {
331 .owner = THIS_MODULE,
332 .name = "nfs4",
333 .mount = nfs_fs_mount,
334 .kill_sb = nfs_kill_super,
335 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
336 };
337 MODULE_ALIAS_FS("nfs4");
338 EXPORT_SYMBOL_GPL(nfs4_fs_type);
339
340 static int __init register_nfs4_fs(void)
341 {
342 return register_filesystem(&nfs4_fs_type);
343 }
344
345 static void unregister_nfs4_fs(void)
346 {
347 unregister_filesystem(&nfs4_fs_type);
348 }
349 #else
350 static int __init register_nfs4_fs(void)
351 {
352 return 0;
353 }
354
355 static void unregister_nfs4_fs(void)
356 {
357 }
358 #endif
359
360 static struct shrinker acl_shrinker = {
361 .shrink = nfs_access_cache_shrinker,
362 .seeks = DEFAULT_SEEKS,
363 };
364
365 /*
366 * Register the NFS filesystems
367 */
368 int __init register_nfs_fs(void)
369 {
370 int ret;
371
372 ret = register_filesystem(&nfs_fs_type);
373 if (ret < 0)
374 goto error_0;
375
376 ret = register_nfs4_fs();
377 if (ret < 0)
378 goto error_1;
379
380 ret = nfs_register_sysctl();
381 if (ret < 0)
382 goto error_2;
383 register_shrinker(&acl_shrinker);
384 return 0;
385
386 error_2:
387 unregister_nfs4_fs();
388 error_1:
389 unregister_filesystem(&nfs_fs_type);
390 error_0:
391 return ret;
392 }
393
394 /*
395 * Unregister the NFS filesystems
396 */
397 void __exit unregister_nfs_fs(void)
398 {
399 unregister_shrinker(&acl_shrinker);
400 nfs_unregister_sysctl();
401 unregister_nfs4_fs();
402 unregister_filesystem(&nfs_fs_type);
403 }
404
405 void nfs_sb_active(struct super_block *sb)
406 {
407 struct nfs_server *server = NFS_SB(sb);
408
409 if (atomic_inc_return(&server->active) == 1)
410 atomic_inc(&sb->s_active);
411 }
412 EXPORT_SYMBOL_GPL(nfs_sb_active);
413
414 void nfs_sb_deactive(struct super_block *sb)
415 {
416 struct nfs_server *server = NFS_SB(sb);
417
418 if (atomic_dec_and_test(&server->active))
419 deactivate_super(sb);
420 }
421 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
422
423 /*
424 * Deliver file system statistics to userspace
425 */
426 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
427 {
428 struct nfs_server *server = NFS_SB(dentry->d_sb);
429 unsigned char blockbits;
430 unsigned long blockres;
431 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
432 struct nfs_fsstat res;
433 int error = -ENOMEM;
434
435 res.fattr = nfs_alloc_fattr();
436 if (res.fattr == NULL)
437 goto out_err;
438
439 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
440 if (unlikely(error == -ESTALE)) {
441 struct dentry *pd_dentry;
442
443 pd_dentry = dget_parent(dentry);
444 if (pd_dentry != NULL) {
445 nfs_zap_caches(pd_dentry->d_inode);
446 dput(pd_dentry);
447 }
448 }
449 nfs_free_fattr(res.fattr);
450 if (error < 0)
451 goto out_err;
452
453 buf->f_type = NFS_SUPER_MAGIC;
454
455 /*
456 * Current versions of glibc do not correctly handle the
457 * case where f_frsize != f_bsize. Eventually we want to
458 * report the value of wtmult in this field.
459 */
460 buf->f_frsize = dentry->d_sb->s_blocksize;
461
462 /*
463 * On most *nix systems, f_blocks, f_bfree, and f_bavail
464 * are reported in units of f_frsize. Linux hasn't had
465 * an f_frsize field in its statfs struct until recently,
466 * thus historically Linux's sys_statfs reports these
467 * fields in units of f_bsize.
468 */
469 buf->f_bsize = dentry->d_sb->s_blocksize;
470 blockbits = dentry->d_sb->s_blocksize_bits;
471 blockres = (1 << blockbits) - 1;
472 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
473 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
474 buf->f_bavail = (res.abytes + blockres) >> blockbits;
475
476 buf->f_files = res.tfiles;
477 buf->f_ffree = res.afiles;
478
479 buf->f_namelen = server->namelen;
480
481 return 0;
482
483 out_err:
484 dprintk("%s: statfs error = %d\n", __func__, -error);
485 return error;
486 }
487 EXPORT_SYMBOL_GPL(nfs_statfs);
488
489 /*
490 * Map the security flavour number to a name
491 */
492 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
493 {
494 static const struct {
495 rpc_authflavor_t flavour;
496 const char *str;
497 } sec_flavours[] = {
498 { RPC_AUTH_NULL, "null" },
499 { RPC_AUTH_UNIX, "sys" },
500 { RPC_AUTH_GSS_KRB5, "krb5" },
501 { RPC_AUTH_GSS_KRB5I, "krb5i" },
502 { RPC_AUTH_GSS_KRB5P, "krb5p" },
503 { RPC_AUTH_GSS_LKEY, "lkey" },
504 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
505 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
506 { RPC_AUTH_GSS_SPKM, "spkm" },
507 { RPC_AUTH_GSS_SPKMI, "spkmi" },
508 { RPC_AUTH_GSS_SPKMP, "spkmp" },
509 { UINT_MAX, "unknown" }
510 };
511 int i;
512
513 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
514 if (sec_flavours[i].flavour == flavour)
515 break;
516 }
517 return sec_flavours[i].str;
518 }
519
520 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
521 int showdefaults)
522 {
523 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
524
525 seq_printf(m, ",mountproto=");
526 switch (sap->sa_family) {
527 case AF_INET:
528 switch (nfss->mountd_protocol) {
529 case IPPROTO_UDP:
530 seq_printf(m, RPCBIND_NETID_UDP);
531 break;
532 case IPPROTO_TCP:
533 seq_printf(m, RPCBIND_NETID_TCP);
534 break;
535 default:
536 if (showdefaults)
537 seq_printf(m, "auto");
538 }
539 break;
540 case AF_INET6:
541 switch (nfss->mountd_protocol) {
542 case IPPROTO_UDP:
543 seq_printf(m, RPCBIND_NETID_UDP6);
544 break;
545 case IPPROTO_TCP:
546 seq_printf(m, RPCBIND_NETID_TCP6);
547 break;
548 default:
549 if (showdefaults)
550 seq_printf(m, "auto");
551 }
552 break;
553 default:
554 if (showdefaults)
555 seq_printf(m, "auto");
556 }
557 }
558
559 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
560 int showdefaults)
561 {
562 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
563
564 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
565 return;
566
567 switch (sap->sa_family) {
568 case AF_INET: {
569 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
570 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
571 break;
572 }
573 case AF_INET6: {
574 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
575 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
576 break;
577 }
578 default:
579 if (showdefaults)
580 seq_printf(m, ",mountaddr=unspecified");
581 }
582
583 if (nfss->mountd_version || showdefaults)
584 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
585 if ((nfss->mountd_port &&
586 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
587 showdefaults)
588 seq_printf(m, ",mountport=%u", nfss->mountd_port);
589
590 nfs_show_mountd_netid(m, nfss, showdefaults);
591 }
592
593 #if IS_ENABLED(CONFIG_NFS_V4)
594 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
595 int showdefaults)
596 {
597 struct nfs_client *clp = nfss->nfs_client;
598
599 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
600 }
601 #else
602 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
603 int showdefaults)
604 {
605 }
606 #endif
607
608 static void nfs_show_nfs_version(struct seq_file *m,
609 unsigned int version,
610 unsigned int minorversion)
611 {
612 seq_printf(m, ",vers=%u", version);
613 if (version == 4)
614 seq_printf(m, ".%u", minorversion);
615 }
616
617 /*
618 * Describe the mount options in force on this server representation
619 */
620 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
621 int showdefaults)
622 {
623 static const struct proc_nfs_info {
624 int flag;
625 const char *str;
626 const char *nostr;
627 } nfs_info[] = {
628 { NFS_MOUNT_SOFT, ",soft", ",hard" },
629 { NFS_MOUNT_POSIX, ",posix", "" },
630 { NFS_MOUNT_NOCTO, ",nocto", "" },
631 { NFS_MOUNT_NOAC, ",noac", "" },
632 { NFS_MOUNT_NONLM, ",nolock", "" },
633 { NFS_MOUNT_NOACL, ",noacl", "" },
634 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
635 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
636 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
637 { 0, NULL, NULL }
638 };
639 const struct proc_nfs_info *nfs_infop;
640 struct nfs_client *clp = nfss->nfs_client;
641 u32 version = clp->rpc_ops->version;
642 int local_flock, local_fcntl;
643
644 nfs_show_nfs_version(m, version, clp->cl_minorversion);
645 seq_printf(m, ",rsize=%u", nfss->rsize);
646 seq_printf(m, ",wsize=%u", nfss->wsize);
647 if (nfss->bsize != 0)
648 seq_printf(m, ",bsize=%u", nfss->bsize);
649 seq_printf(m, ",namlen=%u", nfss->namelen);
650 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
651 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
652 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
653 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
654 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
655 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
656 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
657 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
658 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
659 if (nfss->flags & nfs_infop->flag)
660 seq_puts(m, nfs_infop->str);
661 else
662 seq_puts(m, nfs_infop->nostr);
663 }
664 rcu_read_lock();
665 seq_printf(m, ",proto=%s",
666 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
667 rcu_read_unlock();
668 if (version == 4) {
669 if (nfss->port != NFS_PORT)
670 seq_printf(m, ",port=%u", nfss->port);
671 } else
672 if (nfss->port)
673 seq_printf(m, ",port=%u", nfss->port);
674
675 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
676 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
677 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
678
679 if (version != 4)
680 nfs_show_mountd_options(m, nfss, showdefaults);
681 else
682 nfs_show_nfsv4_options(m, nfss, showdefaults);
683
684 if (nfss->options & NFS_OPTION_FSCACHE)
685 seq_printf(m, ",fsc");
686
687 if (nfss->options & NFS_OPTION_MIGRATION)
688 seq_printf(m, ",migration");
689
690 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
691 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
692 seq_printf(m, ",lookupcache=none");
693 else
694 seq_printf(m, ",lookupcache=pos");
695 }
696
697 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
698 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
699
700 if (!local_flock && !local_fcntl)
701 seq_printf(m, ",local_lock=none");
702 else if (local_flock && local_fcntl)
703 seq_printf(m, ",local_lock=all");
704 else if (local_flock)
705 seq_printf(m, ",local_lock=flock");
706 else
707 seq_printf(m, ",local_lock=posix");
708 }
709
710 /*
711 * Describe the mount options on this VFS mountpoint
712 */
713 int nfs_show_options(struct seq_file *m, struct dentry *root)
714 {
715 struct nfs_server *nfss = NFS_SB(root->d_sb);
716
717 nfs_show_mount_options(m, nfss, 0);
718
719 rcu_read_lock();
720 seq_printf(m, ",addr=%s",
721 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
722 RPC_DISPLAY_ADDR));
723 rcu_read_unlock();
724
725 return 0;
726 }
727 EXPORT_SYMBOL_GPL(nfs_show_options);
728
729 #if IS_ENABLED(CONFIG_NFS_V4)
730 #ifdef CONFIG_NFS_V4_1
731 static void show_sessions(struct seq_file *m, struct nfs_server *server)
732 {
733 if (nfs4_has_session(server->nfs_client))
734 seq_printf(m, ",sessions");
735 }
736 #else
737 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
738 #endif
739 #endif
740
741 #ifdef CONFIG_NFS_V4_1
742 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
743 {
744 seq_printf(m, ",pnfs=");
745 if (server->pnfs_curr_ld)
746 seq_printf(m, "%s", server->pnfs_curr_ld->name);
747 else
748 seq_printf(m, "not configured");
749 }
750
751 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
752 {
753 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
754 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
755 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
756 "date='%llu,%u'",
757 impl_id->name, impl_id->domain,
758 impl_id->date.seconds, impl_id->date.nseconds);
759 }
760 }
761 #else
762 #if IS_ENABLED(CONFIG_NFS_V4)
763 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
764 {
765 }
766 #endif
767 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
768 {
769 }
770 #endif
771
772 int nfs_show_devname(struct seq_file *m, struct dentry *root)
773 {
774 char *page = (char *) __get_free_page(GFP_KERNEL);
775 char *devname, *dummy;
776 int err = 0;
777 if (!page)
778 return -ENOMEM;
779 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
780 if (IS_ERR(devname))
781 err = PTR_ERR(devname);
782 else
783 seq_escape(m, devname, " \t\n\\");
784 free_page((unsigned long)page);
785 return err;
786 }
787 EXPORT_SYMBOL_GPL(nfs_show_devname);
788
789 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
790 {
791 seq_puts(m, "/");
792 return 0;
793 }
794 EXPORT_SYMBOL_GPL(nfs_show_path);
795
796 /*
797 * Present statistical information for this VFS mountpoint
798 */
799 int nfs_show_stats(struct seq_file *m, struct dentry *root)
800 {
801 int i, cpu;
802 struct nfs_server *nfss = NFS_SB(root->d_sb);
803 struct rpc_auth *auth = nfss->client->cl_auth;
804 struct nfs_iostats totals = { };
805
806 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
807
808 /*
809 * Display all mount option settings
810 */
811 seq_printf(m, "\n\topts:\t");
812 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
813 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
814 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
815 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
816 nfs_show_mount_options(m, nfss, 1);
817
818 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
819
820 show_implementation_id(m, nfss);
821
822 seq_printf(m, "\n\tcaps:\t");
823 seq_printf(m, "caps=0x%x", nfss->caps);
824 seq_printf(m, ",wtmult=%u", nfss->wtmult);
825 seq_printf(m, ",dtsize=%u", nfss->dtsize);
826 seq_printf(m, ",bsize=%u", nfss->bsize);
827 seq_printf(m, ",namlen=%u", nfss->namelen);
828
829 #if IS_ENABLED(CONFIG_NFS_V4)
830 if (nfss->nfs_client->rpc_ops->version == 4) {
831 seq_printf(m, "\n\tnfsv4:\t");
832 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
833 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
834 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
835 show_sessions(m, nfss);
836 show_pnfs(m, nfss);
837 }
838 #endif
839
840 /*
841 * Display security flavor in effect for this mount
842 */
843 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
844 if (auth->au_flavor)
845 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
846
847 /*
848 * Display superblock I/O counters
849 */
850 for_each_possible_cpu(cpu) {
851 struct nfs_iostats *stats;
852
853 preempt_disable();
854 stats = per_cpu_ptr(nfss->io_stats, cpu);
855
856 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
857 totals.events[i] += stats->events[i];
858 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
859 totals.bytes[i] += stats->bytes[i];
860 #ifdef CONFIG_NFS_FSCACHE
861 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
862 totals.fscache[i] += stats->fscache[i];
863 #endif
864
865 preempt_enable();
866 }
867
868 seq_printf(m, "\n\tevents:\t");
869 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
870 seq_printf(m, "%lu ", totals.events[i]);
871 seq_printf(m, "\n\tbytes:\t");
872 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
873 seq_printf(m, "%Lu ", totals.bytes[i]);
874 #ifdef CONFIG_NFS_FSCACHE
875 if (nfss->options & NFS_OPTION_FSCACHE) {
876 seq_printf(m, "\n\tfsc:\t");
877 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
878 seq_printf(m, "%Lu ", totals.bytes[i]);
879 }
880 #endif
881 seq_printf(m, "\n");
882
883 rpc_print_iostats(m, nfss->client);
884
885 return 0;
886 }
887 EXPORT_SYMBOL_GPL(nfs_show_stats);
888
889 /*
890 * Begin unmount by attempting to remove all automounted mountpoints we added
891 * in response to xdev traversals and referrals
892 */
893 void nfs_umount_begin(struct super_block *sb)
894 {
895 struct nfs_server *server;
896 struct rpc_clnt *rpc;
897
898 server = NFS_SB(sb);
899 /* -EIO all pending I/O */
900 rpc = server->client_acl;
901 if (!IS_ERR(rpc))
902 rpc_killall_tasks(rpc);
903 rpc = server->client;
904 if (!IS_ERR(rpc))
905 rpc_killall_tasks(rpc);
906 }
907 EXPORT_SYMBOL_GPL(nfs_umount_begin);
908
909 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
910 {
911 struct nfs_parsed_mount_data *data;
912
913 data = kzalloc(sizeof(*data), GFP_KERNEL);
914 if (data) {
915 data->acregmin = NFS_DEF_ACREGMIN;
916 data->acregmax = NFS_DEF_ACREGMAX;
917 data->acdirmin = NFS_DEF_ACDIRMIN;
918 data->acdirmax = NFS_DEF_ACDIRMAX;
919 data->mount_server.port = NFS_UNSPEC_PORT;
920 data->nfs_server.port = NFS_UNSPEC_PORT;
921 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
922 data->auth_flavors[0] = RPC_AUTH_UNIX;
923 data->auth_flavor_len = 1;
924 data->minorversion = 0;
925 data->need_mount = true;
926 data->net = current->nsproxy->net_ns;
927 security_init_mnt_opts(&data->lsm_opts);
928 }
929 return data;
930 }
931
932 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
933 {
934 if (data) {
935 kfree(data->client_address);
936 kfree(data->mount_server.hostname);
937 kfree(data->nfs_server.export_path);
938 kfree(data->nfs_server.hostname);
939 kfree(data->fscache_uniq);
940 security_free_mnt_opts(&data->lsm_opts);
941 kfree(data);
942 }
943 }
944
945 /*
946 * Sanity-check a server address provided by the mount command.
947 *
948 * Address family must be initialized, and address must not be
949 * the ANY address for that family.
950 */
951 static int nfs_verify_server_address(struct sockaddr *addr)
952 {
953 switch (addr->sa_family) {
954 case AF_INET: {
955 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
956 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
957 }
958 case AF_INET6: {
959 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
960 return !ipv6_addr_any(sa);
961 }
962 }
963
964 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
965 return 0;
966 }
967
968 /*
969 * Select between a default port value and a user-specified port value.
970 * If a zero value is set, then autobind will be used.
971 */
972 static void nfs_set_port(struct sockaddr *sap, int *port,
973 const unsigned short default_port)
974 {
975 if (*port == NFS_UNSPEC_PORT)
976 *port = default_port;
977
978 rpc_set_port(sap, *port);
979 }
980
981 /*
982 * Sanity check the NFS transport protocol.
983 *
984 */
985 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
986 {
987 switch (mnt->nfs_server.protocol) {
988 case XPRT_TRANSPORT_UDP:
989 case XPRT_TRANSPORT_TCP:
990 case XPRT_TRANSPORT_RDMA:
991 break;
992 default:
993 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
994 }
995 }
996
997 /*
998 * For text based NFSv2/v3 mounts, the mount protocol transport default
999 * settings should depend upon the specified NFS transport.
1000 */
1001 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1002 {
1003 nfs_validate_transport_protocol(mnt);
1004
1005 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1006 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1007 return;
1008 switch (mnt->nfs_server.protocol) {
1009 case XPRT_TRANSPORT_UDP:
1010 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1011 break;
1012 case XPRT_TRANSPORT_TCP:
1013 case XPRT_TRANSPORT_RDMA:
1014 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1015 }
1016 }
1017
1018 /*
1019 * Parse the value of the 'sec=' option.
1020 */
1021 static int nfs_parse_security_flavors(char *value,
1022 struct nfs_parsed_mount_data *mnt)
1023 {
1024 substring_t args[MAX_OPT_ARGS];
1025
1026 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1027
1028 switch (match_token(value, nfs_secflavor_tokens, args)) {
1029 case Opt_sec_none:
1030 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1031 break;
1032 case Opt_sec_sys:
1033 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1034 break;
1035 case Opt_sec_krb5:
1036 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1037 break;
1038 case Opt_sec_krb5i:
1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1040 break;
1041 case Opt_sec_krb5p:
1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1043 break;
1044 case Opt_sec_lkey:
1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1046 break;
1047 case Opt_sec_lkeyi:
1048 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1049 break;
1050 case Opt_sec_lkeyp:
1051 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1052 break;
1053 case Opt_sec_spkm:
1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1055 break;
1056 case Opt_sec_spkmi:
1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1058 break;
1059 case Opt_sec_spkmp:
1060 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1061 break;
1062 default:
1063 return 0;
1064 }
1065
1066 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1067 mnt->auth_flavor_len = 1;
1068 return 1;
1069 }
1070
1071 static int nfs_parse_version_string(char *string,
1072 struct nfs_parsed_mount_data *mnt,
1073 substring_t *args)
1074 {
1075 mnt->flags &= ~NFS_MOUNT_VER3;
1076 switch (match_token(string, nfs_vers_tokens, args)) {
1077 case Opt_vers_2:
1078 mnt->version = 2;
1079 break;
1080 case Opt_vers_3:
1081 mnt->flags |= NFS_MOUNT_VER3;
1082 mnt->version = 3;
1083 break;
1084 case Opt_vers_4:
1085 /* Backward compatibility option. In future,
1086 * the mount program should always supply
1087 * a NFSv4 minor version number.
1088 */
1089 mnt->version = 4;
1090 break;
1091 case Opt_vers_4_0:
1092 mnt->version = 4;
1093 mnt->minorversion = 0;
1094 break;
1095 case Opt_vers_4_1:
1096 mnt->version = 4;
1097 mnt->minorversion = 1;
1098 break;
1099 default:
1100 return 0;
1101 }
1102 return 1;
1103 }
1104
1105 static int nfs_get_option_str(substring_t args[], char **option)
1106 {
1107 kfree(*option);
1108 *option = match_strdup(args);
1109 return !*option;
1110 }
1111
1112 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1113 {
1114 int rc;
1115 char *string;
1116
1117 string = match_strdup(args);
1118 if (string == NULL)
1119 return -ENOMEM;
1120 rc = kstrtoul(string, 10, option);
1121 kfree(string);
1122
1123 return rc;
1124 }
1125
1126 /*
1127 * Error-check and convert a string of mount options from user space into
1128 * a data structure. The whole mount string is processed; bad options are
1129 * skipped as they are encountered. If there were no errors, return 1;
1130 * otherwise return 0 (zero).
1131 */
1132 static int nfs_parse_mount_options(char *raw,
1133 struct nfs_parsed_mount_data *mnt)
1134 {
1135 char *p, *string, *secdata;
1136 int rc, sloppy = 0, invalid_option = 0;
1137 unsigned short protofamily = AF_UNSPEC;
1138 unsigned short mountfamily = AF_UNSPEC;
1139
1140 if (!raw) {
1141 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1142 return 1;
1143 }
1144 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1145
1146 secdata = alloc_secdata();
1147 if (!secdata)
1148 goto out_nomem;
1149
1150 rc = security_sb_copy_data(raw, secdata);
1151 if (rc)
1152 goto out_security_failure;
1153
1154 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1155 if (rc)
1156 goto out_security_failure;
1157
1158 free_secdata(secdata);
1159
1160 while ((p = strsep(&raw, ",")) != NULL) {
1161 substring_t args[MAX_OPT_ARGS];
1162 unsigned long option;
1163 int token;
1164
1165 if (!*p)
1166 continue;
1167
1168 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1169
1170 token = match_token(p, nfs_mount_option_tokens, args);
1171 switch (token) {
1172
1173 /*
1174 * boolean options: foo/nofoo
1175 */
1176 case Opt_soft:
1177 mnt->flags |= NFS_MOUNT_SOFT;
1178 break;
1179 case Opt_hard:
1180 mnt->flags &= ~NFS_MOUNT_SOFT;
1181 break;
1182 case Opt_posix:
1183 mnt->flags |= NFS_MOUNT_POSIX;
1184 break;
1185 case Opt_noposix:
1186 mnt->flags &= ~NFS_MOUNT_POSIX;
1187 break;
1188 case Opt_cto:
1189 mnt->flags &= ~NFS_MOUNT_NOCTO;
1190 break;
1191 case Opt_nocto:
1192 mnt->flags |= NFS_MOUNT_NOCTO;
1193 break;
1194 case Opt_ac:
1195 mnt->flags &= ~NFS_MOUNT_NOAC;
1196 break;
1197 case Opt_noac:
1198 mnt->flags |= NFS_MOUNT_NOAC;
1199 break;
1200 case Opt_lock:
1201 mnt->flags &= ~NFS_MOUNT_NONLM;
1202 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1203 NFS_MOUNT_LOCAL_FCNTL);
1204 break;
1205 case Opt_nolock:
1206 mnt->flags |= NFS_MOUNT_NONLM;
1207 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1208 NFS_MOUNT_LOCAL_FCNTL);
1209 break;
1210 case Opt_udp:
1211 mnt->flags &= ~NFS_MOUNT_TCP;
1212 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1213 break;
1214 case Opt_tcp:
1215 mnt->flags |= NFS_MOUNT_TCP;
1216 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1217 break;
1218 case Opt_rdma:
1219 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1220 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1221 xprt_load_transport(p);
1222 break;
1223 case Opt_acl:
1224 mnt->flags &= ~NFS_MOUNT_NOACL;
1225 break;
1226 case Opt_noacl:
1227 mnt->flags |= NFS_MOUNT_NOACL;
1228 break;
1229 case Opt_rdirplus:
1230 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1231 break;
1232 case Opt_nordirplus:
1233 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1234 break;
1235 case Opt_sharecache:
1236 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1237 break;
1238 case Opt_nosharecache:
1239 mnt->flags |= NFS_MOUNT_UNSHARED;
1240 break;
1241 case Opt_resvport:
1242 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1243 break;
1244 case Opt_noresvport:
1245 mnt->flags |= NFS_MOUNT_NORESVPORT;
1246 break;
1247 case Opt_fscache:
1248 mnt->options |= NFS_OPTION_FSCACHE;
1249 kfree(mnt->fscache_uniq);
1250 mnt->fscache_uniq = NULL;
1251 break;
1252 case Opt_nofscache:
1253 mnt->options &= ~NFS_OPTION_FSCACHE;
1254 kfree(mnt->fscache_uniq);
1255 mnt->fscache_uniq = NULL;
1256 break;
1257 case Opt_migration:
1258 mnt->options |= NFS_OPTION_MIGRATION;
1259 break;
1260 case Opt_nomigration:
1261 mnt->options &= NFS_OPTION_MIGRATION;
1262 break;
1263
1264 /*
1265 * options that take numeric values
1266 */
1267 case Opt_port:
1268 if (nfs_get_option_ul(args, &option) ||
1269 option > USHRT_MAX)
1270 goto out_invalid_value;
1271 mnt->nfs_server.port = option;
1272 break;
1273 case Opt_rsize:
1274 if (nfs_get_option_ul(args, &option))
1275 goto out_invalid_value;
1276 mnt->rsize = option;
1277 break;
1278 case Opt_wsize:
1279 if (nfs_get_option_ul(args, &option))
1280 goto out_invalid_value;
1281 mnt->wsize = option;
1282 break;
1283 case Opt_bsize:
1284 if (nfs_get_option_ul(args, &option))
1285 goto out_invalid_value;
1286 mnt->bsize = option;
1287 break;
1288 case Opt_timeo:
1289 if (nfs_get_option_ul(args, &option) || option == 0)
1290 goto out_invalid_value;
1291 mnt->timeo = option;
1292 break;
1293 case Opt_retrans:
1294 if (nfs_get_option_ul(args, &option) || option == 0)
1295 goto out_invalid_value;
1296 mnt->retrans = option;
1297 break;
1298 case Opt_acregmin:
1299 if (nfs_get_option_ul(args, &option))
1300 goto out_invalid_value;
1301 mnt->acregmin = option;
1302 break;
1303 case Opt_acregmax:
1304 if (nfs_get_option_ul(args, &option))
1305 goto out_invalid_value;
1306 mnt->acregmax = option;
1307 break;
1308 case Opt_acdirmin:
1309 if (nfs_get_option_ul(args, &option))
1310 goto out_invalid_value;
1311 mnt->acdirmin = option;
1312 break;
1313 case Opt_acdirmax:
1314 if (nfs_get_option_ul(args, &option))
1315 goto out_invalid_value;
1316 mnt->acdirmax = option;
1317 break;
1318 case Opt_actimeo:
1319 if (nfs_get_option_ul(args, &option))
1320 goto out_invalid_value;
1321 mnt->acregmin = mnt->acregmax =
1322 mnt->acdirmin = mnt->acdirmax = option;
1323 break;
1324 case Opt_namelen:
1325 if (nfs_get_option_ul(args, &option))
1326 goto out_invalid_value;
1327 mnt->namlen = option;
1328 break;
1329 case Opt_mountport:
1330 if (nfs_get_option_ul(args, &option) ||
1331 option > USHRT_MAX)
1332 goto out_invalid_value;
1333 mnt->mount_server.port = option;
1334 break;
1335 case Opt_mountvers:
1336 if (nfs_get_option_ul(args, &option) ||
1337 option < NFS_MNT_VERSION ||
1338 option > NFS_MNT3_VERSION)
1339 goto out_invalid_value;
1340 mnt->mount_server.version = option;
1341 break;
1342 case Opt_minorversion:
1343 if (nfs_get_option_ul(args, &option))
1344 goto out_invalid_value;
1345 if (option > NFS4_MAX_MINOR_VERSION)
1346 goto out_invalid_value;
1347 mnt->minorversion = option;
1348 break;
1349
1350 /*
1351 * options that take text values
1352 */
1353 case Opt_nfsvers:
1354 string = match_strdup(args);
1355 if (string == NULL)
1356 goto out_nomem;
1357 rc = nfs_parse_version_string(string, mnt, args);
1358 kfree(string);
1359 if (!rc)
1360 goto out_invalid_value;
1361 break;
1362 case Opt_sec:
1363 string = match_strdup(args);
1364 if (string == NULL)
1365 goto out_nomem;
1366 rc = nfs_parse_security_flavors(string, mnt);
1367 kfree(string);
1368 if (!rc) {
1369 dfprintk(MOUNT, "NFS: unrecognized "
1370 "security flavor\n");
1371 return 0;
1372 }
1373 break;
1374 case Opt_proto:
1375 string = match_strdup(args);
1376 if (string == NULL)
1377 goto out_nomem;
1378 token = match_token(string,
1379 nfs_xprt_protocol_tokens, args);
1380
1381 protofamily = AF_INET;
1382 switch (token) {
1383 case Opt_xprt_udp6:
1384 protofamily = AF_INET6;
1385 case Opt_xprt_udp:
1386 mnt->flags &= ~NFS_MOUNT_TCP;
1387 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1388 break;
1389 case Opt_xprt_tcp6:
1390 protofamily = AF_INET6;
1391 case Opt_xprt_tcp:
1392 mnt->flags |= NFS_MOUNT_TCP;
1393 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1394 break;
1395 case Opt_xprt_rdma:
1396 /* vector side protocols to TCP */
1397 mnt->flags |= NFS_MOUNT_TCP;
1398 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1399 xprt_load_transport(string);
1400 break;
1401 default:
1402 dfprintk(MOUNT, "NFS: unrecognized "
1403 "transport protocol\n");
1404 kfree(string);
1405 return 0;
1406 }
1407 kfree(string);
1408 break;
1409 case Opt_mountproto:
1410 string = match_strdup(args);
1411 if (string == NULL)
1412 goto out_nomem;
1413 token = match_token(string,
1414 nfs_xprt_protocol_tokens, args);
1415 kfree(string);
1416
1417 mountfamily = AF_INET;
1418 switch (token) {
1419 case Opt_xprt_udp6:
1420 mountfamily = AF_INET6;
1421 case Opt_xprt_udp:
1422 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1423 break;
1424 case Opt_xprt_tcp6:
1425 mountfamily = AF_INET6;
1426 case Opt_xprt_tcp:
1427 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1428 break;
1429 case Opt_xprt_rdma: /* not used for side protocols */
1430 default:
1431 dfprintk(MOUNT, "NFS: unrecognized "
1432 "transport protocol\n");
1433 return 0;
1434 }
1435 break;
1436 case Opt_addr:
1437 string = match_strdup(args);
1438 if (string == NULL)
1439 goto out_nomem;
1440 mnt->nfs_server.addrlen =
1441 rpc_pton(mnt->net, string, strlen(string),
1442 (struct sockaddr *)
1443 &mnt->nfs_server.address,
1444 sizeof(mnt->nfs_server.address));
1445 kfree(string);
1446 if (mnt->nfs_server.addrlen == 0)
1447 goto out_invalid_address;
1448 break;
1449 case Opt_clientaddr:
1450 if (nfs_get_option_str(args, &mnt->client_address))
1451 goto out_nomem;
1452 break;
1453 case Opt_mounthost:
1454 if (nfs_get_option_str(args,
1455 &mnt->mount_server.hostname))
1456 goto out_nomem;
1457 break;
1458 case Opt_mountaddr:
1459 string = match_strdup(args);
1460 if (string == NULL)
1461 goto out_nomem;
1462 mnt->mount_server.addrlen =
1463 rpc_pton(mnt->net, string, strlen(string),
1464 (struct sockaddr *)
1465 &mnt->mount_server.address,
1466 sizeof(mnt->mount_server.address));
1467 kfree(string);
1468 if (mnt->mount_server.addrlen == 0)
1469 goto out_invalid_address;
1470 break;
1471 case Opt_lookupcache:
1472 string = match_strdup(args);
1473 if (string == NULL)
1474 goto out_nomem;
1475 token = match_token(string,
1476 nfs_lookupcache_tokens, args);
1477 kfree(string);
1478 switch (token) {
1479 case Opt_lookupcache_all:
1480 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1481 break;
1482 case Opt_lookupcache_positive:
1483 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1484 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1485 break;
1486 case Opt_lookupcache_none:
1487 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1488 break;
1489 default:
1490 dfprintk(MOUNT, "NFS: invalid "
1491 "lookupcache argument\n");
1492 return 0;
1493 };
1494 break;
1495 case Opt_fscache_uniq:
1496 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1497 goto out_nomem;
1498 mnt->options |= NFS_OPTION_FSCACHE;
1499 break;
1500 case Opt_local_lock:
1501 string = match_strdup(args);
1502 if (string == NULL)
1503 goto out_nomem;
1504 token = match_token(string, nfs_local_lock_tokens,
1505 args);
1506 kfree(string);
1507 switch (token) {
1508 case Opt_local_lock_all:
1509 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1510 NFS_MOUNT_LOCAL_FCNTL);
1511 break;
1512 case Opt_local_lock_flock:
1513 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1514 break;
1515 case Opt_local_lock_posix:
1516 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1517 break;
1518 case Opt_local_lock_none:
1519 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1520 NFS_MOUNT_LOCAL_FCNTL);
1521 break;
1522 default:
1523 dfprintk(MOUNT, "NFS: invalid "
1524 "local_lock argument\n");
1525 return 0;
1526 };
1527 break;
1528
1529 /*
1530 * Special options
1531 */
1532 case Opt_sloppy:
1533 sloppy = 1;
1534 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1535 break;
1536 case Opt_userspace:
1537 case Opt_deprecated:
1538 dfprintk(MOUNT, "NFS: ignoring mount option "
1539 "'%s'\n", p);
1540 break;
1541
1542 default:
1543 invalid_option = 1;
1544 dfprintk(MOUNT, "NFS: unrecognized mount option "
1545 "'%s'\n", p);
1546 }
1547 }
1548
1549 if (!sloppy && invalid_option)
1550 return 0;
1551
1552 if (mnt->minorversion && mnt->version != 4)
1553 goto out_minorversion_mismatch;
1554
1555 if (mnt->options & NFS_OPTION_MIGRATION &&
1556 mnt->version != 4 && mnt->minorversion != 0)
1557 goto out_migration_misuse;
1558
1559 /*
1560 * verify that any proto=/mountproto= options match the address
1561 * families in the addr=/mountaddr= options.
1562 */
1563 if (protofamily != AF_UNSPEC &&
1564 protofamily != mnt->nfs_server.address.ss_family)
1565 goto out_proto_mismatch;
1566
1567 if (mountfamily != AF_UNSPEC) {
1568 if (mnt->mount_server.addrlen) {
1569 if (mountfamily != mnt->mount_server.address.ss_family)
1570 goto out_mountproto_mismatch;
1571 } else {
1572 if (mountfamily != mnt->nfs_server.address.ss_family)
1573 goto out_mountproto_mismatch;
1574 }
1575 }
1576
1577 return 1;
1578
1579 out_mountproto_mismatch:
1580 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1581 "option\n");
1582 return 0;
1583 out_proto_mismatch:
1584 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1585 return 0;
1586 out_invalid_address:
1587 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1588 return 0;
1589 out_invalid_value:
1590 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1591 return 0;
1592 out_minorversion_mismatch:
1593 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1594 "minorversion=%u\n", mnt->version, mnt->minorversion);
1595 return 0;
1596 out_migration_misuse:
1597 printk(KERN_INFO
1598 "NFS: 'migration' not supported for this NFS version\n");
1599 return 0;
1600 out_nomem:
1601 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1602 return 0;
1603 out_security_failure:
1604 free_secdata(secdata);
1605 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1606 return 0;
1607 }
1608
1609 /*
1610 * Match the requested auth flavors with the list returned by
1611 * the server. Returns zero and sets the mount's authentication
1612 * flavor on success; returns -EACCES if server does not support
1613 * the requested flavor.
1614 */
1615 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1616 struct nfs_mount_request *request)
1617 {
1618 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1619
1620 /*
1621 * Certain releases of Linux's mountd return an empty
1622 * flavor list. To prevent behavioral regression with
1623 * these servers (ie. rejecting mounts that used to
1624 * succeed), revert to pre-2.6.32 behavior (no checking)
1625 * if the returned flavor list is empty.
1626 */
1627 if (server_authlist_len == 0)
1628 return 0;
1629
1630 /*
1631 * We avoid sophisticated negotiating here, as there are
1632 * plenty of cases where we can get it wrong, providing
1633 * either too little or too much security.
1634 *
1635 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1636 * flavor listed first. However, some servers list
1637 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1638 * preferred default, in args->auth_flavors[0] if user
1639 * didn't specify sec= mount option.
1640 */
1641 for (i = 0; i < args->auth_flavor_len; i++)
1642 for (j = 0; j < server_authlist_len; j++)
1643 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1644 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1645 request->auth_flavs[j]);
1646 args->auth_flavors[0] = request->auth_flavs[j];
1647 return 0;
1648 }
1649
1650 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1651 nfs_umount(request);
1652 return -EACCES;
1653 }
1654
1655 /*
1656 * Use the remote server's MOUNT service to request the NFS file handle
1657 * corresponding to the provided path.
1658 */
1659 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1660 struct nfs_fh *root_fh)
1661 {
1662 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1663 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1664 struct nfs_mount_request request = {
1665 .sap = (struct sockaddr *)
1666 &args->mount_server.address,
1667 .dirpath = args->nfs_server.export_path,
1668 .protocol = args->mount_server.protocol,
1669 .fh = root_fh,
1670 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1671 .auth_flav_len = &server_authlist_len,
1672 .auth_flavs = server_authlist,
1673 .net = args->net,
1674 };
1675 int status;
1676
1677 if (args->mount_server.version == 0) {
1678 switch (args->version) {
1679 default:
1680 args->mount_server.version = NFS_MNT3_VERSION;
1681 break;
1682 case 2:
1683 args->mount_server.version = NFS_MNT_VERSION;
1684 }
1685 }
1686 request.version = args->mount_server.version;
1687
1688 if (args->mount_server.hostname)
1689 request.hostname = args->mount_server.hostname;
1690 else
1691 request.hostname = args->nfs_server.hostname;
1692
1693 /*
1694 * Construct the mount server's address.
1695 */
1696 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1697 memcpy(request.sap, &args->nfs_server.address,
1698 args->nfs_server.addrlen);
1699 args->mount_server.addrlen = args->nfs_server.addrlen;
1700 }
1701 request.salen = args->mount_server.addrlen;
1702 nfs_set_port(request.sap, &args->mount_server.port, 0);
1703
1704 /*
1705 * Now ask the mount server to map our export path
1706 * to a file handle.
1707 */
1708 status = nfs_mount(&request);
1709 if (status != 0) {
1710 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1711 request.hostname, status);
1712 return status;
1713 }
1714
1715 /*
1716 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1717 */
1718 if (args->mount_server.version != NFS_MNT3_VERSION)
1719 return 0;
1720 return nfs_walk_authlist(args, &request);
1721 }
1722
1723 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1724 struct nfs_mount_info *mount_info,
1725 struct nfs_subversion *nfs_mod)
1726 {
1727 int status;
1728 struct nfs_server *server;
1729
1730 if (mount_info->parsed->need_mount) {
1731 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1732 if (status)
1733 return ERR_PTR(status);
1734 }
1735
1736 /* Get a volume representation */
1737 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1738 if (IS_ERR(server))
1739 return ERR_CAST(server);
1740
1741 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1742 }
1743 EXPORT_SYMBOL_GPL(nfs_try_mount);
1744
1745 /*
1746 * Split "dev_name" into "hostname:export_path".
1747 *
1748 * The leftmost colon demarks the split between the server's hostname
1749 * and the export path. If the hostname starts with a left square
1750 * bracket, then it may contain colons.
1751 *
1752 * Note: caller frees hostname and export path, even on error.
1753 */
1754 static int nfs_parse_devname(const char *dev_name,
1755 char **hostname, size_t maxnamlen,
1756 char **export_path, size_t maxpathlen)
1757 {
1758 size_t len;
1759 char *end;
1760
1761 /* Is the host name protected with square brakcets? */
1762 if (*dev_name == '[') {
1763 end = strchr(++dev_name, ']');
1764 if (end == NULL || end[1] != ':')
1765 goto out_bad_devname;
1766
1767 len = end - dev_name;
1768 end++;
1769 } else {
1770 char *comma;
1771
1772 end = strchr(dev_name, ':');
1773 if (end == NULL)
1774 goto out_bad_devname;
1775 len = end - dev_name;
1776
1777 /* kill possible hostname list: not supported */
1778 comma = strchr(dev_name, ',');
1779 if (comma != NULL && comma < end)
1780 *comma = 0;
1781 }
1782
1783 if (len > maxnamlen)
1784 goto out_hostname;
1785
1786 /* N.B. caller will free nfs_server.hostname in all cases */
1787 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1788 if (*hostname == NULL)
1789 goto out_nomem;
1790 len = strlen(++end);
1791 if (len > maxpathlen)
1792 goto out_path;
1793 *export_path = kstrndup(end, len, GFP_KERNEL);
1794 if (!*export_path)
1795 goto out_nomem;
1796
1797 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1798 return 0;
1799
1800 out_bad_devname:
1801 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1802 return -EINVAL;
1803
1804 out_nomem:
1805 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1806 return -ENOMEM;
1807
1808 out_hostname:
1809 dfprintk(MOUNT, "NFS: server hostname too long\n");
1810 return -ENAMETOOLONG;
1811
1812 out_path:
1813 dfprintk(MOUNT, "NFS: export pathname too long\n");
1814 return -ENAMETOOLONG;
1815 }
1816
1817 /*
1818 * Validate the NFS2/NFS3 mount data
1819 * - fills in the mount root filehandle
1820 *
1821 * For option strings, user space handles the following behaviors:
1822 *
1823 * + DNS: mapping server host name to IP address ("addr=" option)
1824 *
1825 * + failure mode: how to behave if a mount request can't be handled
1826 * immediately ("fg/bg" option)
1827 *
1828 * + retry: how often to retry a mount request ("retry=" option)
1829 *
1830 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1831 * mountproto=tcp after mountproto=udp, and so on
1832 */
1833 static int nfs23_validate_mount_data(void *options,
1834 struct nfs_parsed_mount_data *args,
1835 struct nfs_fh *mntfh,
1836 const char *dev_name)
1837 {
1838 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1839 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1840
1841 if (data == NULL)
1842 goto out_no_data;
1843
1844 args->version = NFS_DEFAULT_VERSION;
1845 switch (data->version) {
1846 case 1:
1847 data->namlen = 0;
1848 case 2:
1849 data->bsize = 0;
1850 case 3:
1851 if (data->flags & NFS_MOUNT_VER3)
1852 goto out_no_v3;
1853 data->root.size = NFS2_FHSIZE;
1854 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1855 case 4:
1856 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1857 goto out_no_sec;
1858 case 5:
1859 memset(data->context, 0, sizeof(data->context));
1860 case 6:
1861 if (data->flags & NFS_MOUNT_VER3) {
1862 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1863 goto out_invalid_fh;
1864 mntfh->size = data->root.size;
1865 args->version = 3;
1866 } else {
1867 mntfh->size = NFS2_FHSIZE;
1868 args->version = 2;
1869 }
1870
1871
1872 memcpy(mntfh->data, data->root.data, mntfh->size);
1873 if (mntfh->size < sizeof(mntfh->data))
1874 memset(mntfh->data + mntfh->size, 0,
1875 sizeof(mntfh->data) - mntfh->size);
1876
1877 /*
1878 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1879 * can deal with.
1880 */
1881 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1882 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1883 args->rsize = data->rsize;
1884 args->wsize = data->wsize;
1885 args->timeo = data->timeo;
1886 args->retrans = data->retrans;
1887 args->acregmin = data->acregmin;
1888 args->acregmax = data->acregmax;
1889 args->acdirmin = data->acdirmin;
1890 args->acdirmax = data->acdirmax;
1891 args->need_mount = false;
1892
1893 memcpy(sap, &data->addr, sizeof(data->addr));
1894 args->nfs_server.addrlen = sizeof(data->addr);
1895 args->nfs_server.port = ntohs(data->addr.sin_port);
1896 if (!nfs_verify_server_address(sap))
1897 goto out_no_address;
1898
1899 if (!(data->flags & NFS_MOUNT_TCP))
1900 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1901 /* N.B. caller will free nfs_server.hostname in all cases */
1902 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1903 args->namlen = data->namlen;
1904 args->bsize = data->bsize;
1905
1906 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1907 args->auth_flavors[0] = data->pseudoflavor;
1908 if (!args->nfs_server.hostname)
1909 goto out_nomem;
1910
1911 if (!(data->flags & NFS_MOUNT_NONLM))
1912 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1913 NFS_MOUNT_LOCAL_FCNTL);
1914 else
1915 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1916 NFS_MOUNT_LOCAL_FCNTL);
1917 /*
1918 * The legacy version 6 binary mount data from userspace has a
1919 * field used only to transport selinux information into the
1920 * the kernel. To continue to support that functionality we
1921 * have a touch of selinux knowledge here in the NFS code. The
1922 * userspace code converted context=blah to just blah so we are
1923 * converting back to the full string selinux understands.
1924 */
1925 if (data->context[0]){
1926 #ifdef CONFIG_SECURITY_SELINUX
1927 int rc;
1928 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1929 if (!opts_str)
1930 return -ENOMEM;
1931 strcpy(opts_str, "context=");
1932 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1933 strcat(opts_str, &data->context[0]);
1934 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1935 kfree(opts_str);
1936 if (rc)
1937 return rc;
1938 #else
1939 return -EINVAL;
1940 #endif
1941 }
1942
1943 break;
1944 default:
1945 return NFS_TEXT_DATA;
1946 }
1947
1948 #if !IS_ENABLED(CONFIG_NFS_V3)
1949 if (args->version == 3)
1950 goto out_v3_not_compiled;
1951 #endif /* !CONFIG_NFS_V3 */
1952
1953 return 0;
1954
1955 out_no_data:
1956 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1957 return -EINVAL;
1958
1959 out_no_v3:
1960 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1961 data->version);
1962 return -EINVAL;
1963
1964 out_no_sec:
1965 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1966 return -EINVAL;
1967
1968 #if !IS_ENABLED(CONFIG_NFS_V3)
1969 out_v3_not_compiled:
1970 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1971 return -EPROTONOSUPPORT;
1972 #endif /* !CONFIG_NFS_V3 */
1973
1974 out_nomem:
1975 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1976 return -ENOMEM;
1977
1978 out_no_address:
1979 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1980 return -EINVAL;
1981
1982 out_invalid_fh:
1983 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1984 return -EINVAL;
1985 }
1986
1987 #if IS_ENABLED(CONFIG_NFS_V4)
1988 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1989 void *options,
1990 struct nfs_parsed_mount_data *args,
1991 struct nfs_fh *mntfh,
1992 const char *dev_name)
1993 {
1994 if (fs_type == &nfs_fs_type)
1995 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1996 return nfs4_validate_mount_data(options, args, dev_name);
1997 }
1998 #else
1999 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2000 void *options,
2001 struct nfs_parsed_mount_data *args,
2002 struct nfs_fh *mntfh,
2003 const char *dev_name)
2004 {
2005 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2006 }
2007 #endif
2008
2009 static int nfs_validate_text_mount_data(void *options,
2010 struct nfs_parsed_mount_data *args,
2011 const char *dev_name)
2012 {
2013 int port = 0;
2014 int max_namelen = PAGE_SIZE;
2015 int max_pathlen = NFS_MAXPATHLEN;
2016 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2017
2018 if (nfs_parse_mount_options((char *)options, args) == 0)
2019 return -EINVAL;
2020
2021 if (!nfs_verify_server_address(sap))
2022 goto out_no_address;
2023
2024 if (args->version == 4) {
2025 #if IS_ENABLED(CONFIG_NFS_V4)
2026 port = NFS_PORT;
2027 max_namelen = NFS4_MAXNAMLEN;
2028 max_pathlen = NFS4_MAXPATHLEN;
2029 nfs_validate_transport_protocol(args);
2030 nfs4_validate_mount_flags(args);
2031 #else
2032 goto out_v4_not_compiled;
2033 #endif /* CONFIG_NFS_V4 */
2034 } else
2035 nfs_set_mount_transport_protocol(args);
2036
2037 nfs_set_port(sap, &args->nfs_server.port, port);
2038
2039 if (args->auth_flavor_len > 1)
2040 goto out_bad_auth;
2041
2042 return nfs_parse_devname(dev_name,
2043 &args->nfs_server.hostname,
2044 max_namelen,
2045 &args->nfs_server.export_path,
2046 max_pathlen);
2047
2048 #if !IS_ENABLED(CONFIG_NFS_V4)
2049 out_v4_not_compiled:
2050 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2051 return -EPROTONOSUPPORT;
2052 #endif /* !CONFIG_NFS_V4 */
2053
2054 out_no_address:
2055 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2056 return -EINVAL;
2057
2058 out_bad_auth:
2059 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2060 return -EINVAL;
2061 }
2062
2063 static int
2064 nfs_compare_remount_data(struct nfs_server *nfss,
2065 struct nfs_parsed_mount_data *data)
2066 {
2067 if (data->flags != nfss->flags ||
2068 data->rsize != nfss->rsize ||
2069 data->wsize != nfss->wsize ||
2070 data->retrans != nfss->client->cl_timeout->to_retries ||
2071 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2072 data->acregmin != nfss->acregmin / HZ ||
2073 data->acregmax != nfss->acregmax / HZ ||
2074 data->acdirmin != nfss->acdirmin / HZ ||
2075 data->acdirmax != nfss->acdirmax / HZ ||
2076 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2077 data->nfs_server.port != nfss->port ||
2078 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2079 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2080 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2081 return -EINVAL;
2082
2083 return 0;
2084 }
2085
2086 int
2087 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2088 {
2089 int error;
2090 struct nfs_server *nfss = sb->s_fs_info;
2091 struct nfs_parsed_mount_data *data;
2092 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2093 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2094 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2095
2096 /*
2097 * Userspace mount programs that send binary options generally send
2098 * them populated with default values. We have no way to know which
2099 * ones were explicitly specified. Fall back to legacy behavior and
2100 * just return success.
2101 */
2102 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2103 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2104 options->version <= 6))))
2105 return 0;
2106
2107 data = kzalloc(sizeof(*data), GFP_KERNEL);
2108 if (data == NULL)
2109 return -ENOMEM;
2110
2111 /* fill out struct with values from existing mount */
2112 data->flags = nfss->flags;
2113 data->rsize = nfss->rsize;
2114 data->wsize = nfss->wsize;
2115 data->retrans = nfss->client->cl_timeout->to_retries;
2116 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2117 data->acregmin = nfss->acregmin / HZ;
2118 data->acregmax = nfss->acregmax / HZ;
2119 data->acdirmin = nfss->acdirmin / HZ;
2120 data->acdirmax = nfss->acdirmax / HZ;
2121 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2122 data->nfs_server.port = nfss->port;
2123 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2124 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2125 data->nfs_server.addrlen);
2126
2127 /* overwrite those values with any that were specified */
2128 error = nfs_parse_mount_options((char *)options, data);
2129 if (error < 0)
2130 goto out;
2131
2132 /*
2133 * noac is a special case. It implies -o sync, but that's not
2134 * necessarily reflected in the mtab options. do_remount_sb
2135 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2136 * remount options, so we have to explicitly reset it.
2137 */
2138 if (data->flags & NFS_MOUNT_NOAC)
2139 *flags |= MS_SYNCHRONOUS;
2140
2141 /* compare new mount options with old ones */
2142 error = nfs_compare_remount_data(nfss, data);
2143 out:
2144 kfree(data);
2145 return error;
2146 }
2147 EXPORT_SYMBOL_GPL(nfs_remount);
2148
2149 /*
2150 * Initialise the common bits of the superblock
2151 */
2152 inline void nfs_initialise_sb(struct super_block *sb)
2153 {
2154 struct nfs_server *server = NFS_SB(sb);
2155
2156 sb->s_magic = NFS_SUPER_MAGIC;
2157
2158 /* We probably want something more informative here */
2159 snprintf(sb->s_id, sizeof(sb->s_id),
2160 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2161
2162 if (sb->s_blocksize == 0)
2163 sb->s_blocksize = nfs_block_bits(server->wsize,
2164 &sb->s_blocksize_bits);
2165
2166 sb->s_bdi = &server->backing_dev_info;
2167
2168 nfs_super_set_maxbytes(sb, server->maxfilesize);
2169 }
2170
2171 /*
2172 * Finish setting up an NFS2/3 superblock
2173 */
2174 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2175 {
2176 struct nfs_parsed_mount_data *data = mount_info->parsed;
2177 struct nfs_server *server = NFS_SB(sb);
2178
2179 sb->s_blocksize_bits = 0;
2180 sb->s_blocksize = 0;
2181 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2182 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2183 if (data && data->bsize)
2184 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2185
2186 if (server->nfs_client->rpc_ops->version != 2) {
2187 /* The VFS shouldn't apply the umask to mode bits. We will do
2188 * so ourselves when necessary.
2189 */
2190 sb->s_flags |= MS_POSIXACL;
2191 sb->s_time_gran = 1;
2192 }
2193
2194 nfs_initialise_sb(sb);
2195 }
2196 EXPORT_SYMBOL_GPL(nfs_fill_super);
2197
2198 /*
2199 * Finish setting up a cloned NFS2/3/4 superblock
2200 */
2201 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2202 {
2203 const struct super_block *old_sb = mount_info->cloned->sb;
2204 struct nfs_server *server = NFS_SB(sb);
2205
2206 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2207 sb->s_blocksize = old_sb->s_blocksize;
2208 sb->s_maxbytes = old_sb->s_maxbytes;
2209 sb->s_xattr = old_sb->s_xattr;
2210 sb->s_op = old_sb->s_op;
2211 sb->s_time_gran = 1;
2212
2213 if (server->nfs_client->rpc_ops->version != 2) {
2214 /* The VFS shouldn't apply the umask to mode bits. We will do
2215 * so ourselves when necessary.
2216 */
2217 sb->s_flags |= MS_POSIXACL;
2218 }
2219
2220 nfs_initialise_sb(sb);
2221 }
2222
2223 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2224 {
2225 const struct nfs_server *a = s->s_fs_info;
2226 const struct rpc_clnt *clnt_a = a->client;
2227 const struct rpc_clnt *clnt_b = b->client;
2228
2229 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2230 goto Ebusy;
2231 if (a->nfs_client != b->nfs_client)
2232 goto Ebusy;
2233 if (a->flags != b->flags)
2234 goto Ebusy;
2235 if (a->wsize != b->wsize)
2236 goto Ebusy;
2237 if (a->rsize != b->rsize)
2238 goto Ebusy;
2239 if (a->acregmin != b->acregmin)
2240 goto Ebusy;
2241 if (a->acregmax != b->acregmax)
2242 goto Ebusy;
2243 if (a->acdirmin != b->acdirmin)
2244 goto Ebusy;
2245 if (a->acdirmax != b->acdirmax)
2246 goto Ebusy;
2247 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2248 goto Ebusy;
2249 return 1;
2250 Ebusy:
2251 return 0;
2252 }
2253
2254 struct nfs_sb_mountdata {
2255 struct nfs_server *server;
2256 int mntflags;
2257 };
2258
2259 static int nfs_set_super(struct super_block *s, void *data)
2260 {
2261 struct nfs_sb_mountdata *sb_mntdata = data;
2262 struct nfs_server *server = sb_mntdata->server;
2263 int ret;
2264
2265 s->s_flags = sb_mntdata->mntflags;
2266 s->s_fs_info = server;
2267 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2268 ret = set_anon_super(s, server);
2269 if (ret == 0)
2270 server->s_dev = s->s_dev;
2271 return ret;
2272 }
2273
2274 static int nfs_compare_super_address(struct nfs_server *server1,
2275 struct nfs_server *server2)
2276 {
2277 struct sockaddr *sap1, *sap2;
2278
2279 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2280 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2281
2282 if (sap1->sa_family != sap2->sa_family)
2283 return 0;
2284
2285 switch (sap1->sa_family) {
2286 case AF_INET: {
2287 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2288 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2289 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2290 return 0;
2291 if (sin1->sin_port != sin2->sin_port)
2292 return 0;
2293 break;
2294 }
2295 case AF_INET6: {
2296 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2297 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2298 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2299 return 0;
2300 if (sin1->sin6_port != sin2->sin6_port)
2301 return 0;
2302 break;
2303 }
2304 default:
2305 return 0;
2306 }
2307
2308 return 1;
2309 }
2310
2311 static int nfs_compare_super(struct super_block *sb, void *data)
2312 {
2313 struct nfs_sb_mountdata *sb_mntdata = data;
2314 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2315 int mntflags = sb_mntdata->mntflags;
2316
2317 if (!nfs_compare_super_address(old, server))
2318 return 0;
2319 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2320 if (old->flags & NFS_MOUNT_UNSHARED)
2321 return 0;
2322 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2323 return 0;
2324 return nfs_compare_mount_options(sb, server, mntflags);
2325 }
2326
2327 #ifdef CONFIG_NFS_FSCACHE
2328 static void nfs_get_cache_cookie(struct super_block *sb,
2329 struct nfs_parsed_mount_data *parsed,
2330 struct nfs_clone_mount *cloned)
2331 {
2332 struct nfs_server *nfss = NFS_SB(sb);
2333 char *uniq = NULL;
2334 int ulen = 0;
2335
2336 nfss->fscache_key = NULL;
2337 nfss->fscache = NULL;
2338
2339 if (parsed) {
2340 if (!(parsed->options & NFS_OPTION_FSCACHE))
2341 return;
2342 if (parsed->fscache_uniq) {
2343 uniq = parsed->fscache_uniq;
2344 ulen = strlen(parsed->fscache_uniq);
2345 }
2346 } else if (cloned) {
2347 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2348 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2349 return;
2350 if (mnt_s->fscache_key) {
2351 uniq = mnt_s->fscache_key->key.uniquifier;
2352 ulen = mnt_s->fscache_key->key.uniq_len;
2353 };
2354 } else
2355 return;
2356
2357 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2358 }
2359 #else
2360 static void nfs_get_cache_cookie(struct super_block *sb,
2361 struct nfs_parsed_mount_data *parsed,
2362 struct nfs_clone_mount *cloned)
2363 {
2364 }
2365 #endif
2366
2367 static int nfs_bdi_register(struct nfs_server *server)
2368 {
2369 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2370 }
2371
2372 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2373 struct nfs_mount_info *mount_info)
2374 {
2375 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2376 }
2377 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2378
2379 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2380 struct nfs_mount_info *mount_info)
2381 {
2382 /* clone any lsm security options from the parent to the new sb */
2383 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2384 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2385 return -ESTALE;
2386 return 0;
2387 }
2388 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2389
2390 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2391 int flags, const char *dev_name,
2392 struct nfs_mount_info *mount_info,
2393 struct nfs_subversion *nfs_mod)
2394 {
2395 struct super_block *s;
2396 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2397 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2398 struct nfs_sb_mountdata sb_mntdata = {
2399 .mntflags = flags,
2400 .server = server,
2401 };
2402 int error;
2403
2404 if (server->flags & NFS_MOUNT_UNSHARED)
2405 compare_super = NULL;
2406
2407 /* -o noac implies -o sync */
2408 if (server->flags & NFS_MOUNT_NOAC)
2409 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2410
2411 /* Get a superblock - note that we may end up sharing one that already exists */
2412 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2413 if (IS_ERR(s)) {
2414 mntroot = ERR_CAST(s);
2415 goto out_err_nosb;
2416 }
2417
2418 if (s->s_fs_info != server) {
2419 nfs_free_server(server);
2420 server = NULL;
2421 } else {
2422 error = nfs_bdi_register(server);
2423 if (error) {
2424 mntroot = ERR_PTR(error);
2425 goto error_splat_bdi;
2426 }
2427 }
2428
2429 if (!s->s_root) {
2430 /* initial superblock/root creation */
2431 mount_info->fill_super(s, mount_info);
2432 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2433 }
2434
2435 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2436 if (IS_ERR(mntroot))
2437 goto error_splat_super;
2438
2439 error = mount_info->set_security(s, mntroot, mount_info);
2440 if (error)
2441 goto error_splat_root;
2442
2443 s->s_flags |= MS_ACTIVE;
2444
2445 out:
2446 return mntroot;
2447
2448 out_err_nosb:
2449 nfs_free_server(server);
2450 goto out;
2451
2452 error_splat_root:
2453 dput(mntroot);
2454 mntroot = ERR_PTR(error);
2455 error_splat_super:
2456 if (server && !s->s_root)
2457 bdi_unregister(&server->backing_dev_info);
2458 error_splat_bdi:
2459 deactivate_locked_super(s);
2460 goto out;
2461 }
2462 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2463
2464 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2465 int flags, const char *dev_name, void *raw_data)
2466 {
2467 struct nfs_mount_info mount_info = {
2468 .fill_super = nfs_fill_super,
2469 .set_security = nfs_set_sb_security,
2470 };
2471 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2472 struct nfs_subversion *nfs_mod;
2473 int error;
2474
2475 mount_info.parsed = nfs_alloc_parsed_mount_data();
2476 mount_info.mntfh = nfs_alloc_fhandle();
2477 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2478 goto out;
2479
2480 /* Validate the mount data */
2481 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2482 if (error == NFS_TEXT_DATA)
2483 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2484 if (error < 0) {
2485 mntroot = ERR_PTR(error);
2486 goto out;
2487 }
2488
2489 nfs_mod = get_nfs_version(mount_info.parsed->version);
2490 if (IS_ERR(nfs_mod)) {
2491 mntroot = ERR_CAST(nfs_mod);
2492 goto out;
2493 }
2494
2495 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2496
2497 put_nfs_version(nfs_mod);
2498 out:
2499 nfs_free_parsed_mount_data(mount_info.parsed);
2500 nfs_free_fhandle(mount_info.mntfh);
2501 return mntroot;
2502 }
2503 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2504
2505 /*
2506 * Ensure that we unregister the bdi before kill_anon_super
2507 * releases the device name
2508 */
2509 void nfs_put_super(struct super_block *s)
2510 {
2511 struct nfs_server *server = NFS_SB(s);
2512
2513 bdi_unregister(&server->backing_dev_info);
2514 }
2515 EXPORT_SYMBOL_GPL(nfs_put_super);
2516
2517 /*
2518 * Destroy an NFS2/3 superblock
2519 */
2520 void nfs_kill_super(struct super_block *s)
2521 {
2522 struct nfs_server *server = NFS_SB(s);
2523
2524 kill_anon_super(s);
2525 nfs_fscache_release_super_cookie(s);
2526 nfs_free_server(server);
2527 }
2528 EXPORT_SYMBOL_GPL(nfs_kill_super);
2529
2530 /*
2531 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2532 */
2533 static struct dentry *
2534 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2535 const char *dev_name, void *raw_data)
2536 {
2537 struct nfs_clone_mount *data = raw_data;
2538 struct nfs_mount_info mount_info = {
2539 .fill_super = nfs_clone_super,
2540 .set_security = nfs_clone_sb_security,
2541 .cloned = data,
2542 };
2543 struct nfs_server *server;
2544 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2545 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2546
2547 dprintk("--> nfs_xdev_mount()\n");
2548
2549 mount_info.mntfh = mount_info.cloned->fh;
2550
2551 /* create a new volume representation */
2552 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2553
2554 if (IS_ERR(server))
2555 mntroot = ERR_CAST(server);
2556 else
2557 mntroot = nfs_fs_mount_common(server, flags,
2558 dev_name, &mount_info, nfs_mod);
2559
2560 dprintk("<-- nfs_xdev_mount() = %ld\n",
2561 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2562 return mntroot;
2563 }
2564
2565 #if IS_ENABLED(CONFIG_NFS_V4)
2566
2567 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2568 {
2569 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2570 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2571 }
2572
2573 /*
2574 * Validate NFSv4 mount options
2575 */
2576 static int nfs4_validate_mount_data(void *options,
2577 struct nfs_parsed_mount_data *args,
2578 const char *dev_name)
2579 {
2580 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2581 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2582 char *c;
2583
2584 if (data == NULL)
2585 goto out_no_data;
2586
2587 args->version = 4;
2588
2589 switch (data->version) {
2590 case 1:
2591 if (data->host_addrlen > sizeof(args->nfs_server.address))
2592 goto out_no_address;
2593 if (data->host_addrlen == 0)
2594 goto out_no_address;
2595 args->nfs_server.addrlen = data->host_addrlen;
2596 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2597 return -EFAULT;
2598 if (!nfs_verify_server_address(sap))
2599 goto out_no_address;
2600 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2601
2602 if (data->auth_flavourlen) {
2603 if (data->auth_flavourlen > 1)
2604 goto out_inval_auth;
2605 if (copy_from_user(&args->auth_flavors[0],
2606 data->auth_flavours,
2607 sizeof(args->auth_flavors[0])))
2608 return -EFAULT;
2609 }
2610
2611 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2612 if (IS_ERR(c))
2613 return PTR_ERR(c);
2614 args->nfs_server.hostname = c;
2615
2616 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2617 if (IS_ERR(c))
2618 return PTR_ERR(c);
2619 args->nfs_server.export_path = c;
2620 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2621
2622 c = strndup_user(data->client_addr.data, 16);
2623 if (IS_ERR(c))
2624 return PTR_ERR(c);
2625 args->client_address = c;
2626
2627 /*
2628 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2629 * can deal with.
2630 */
2631
2632 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2633 args->rsize = data->rsize;
2634 args->wsize = data->wsize;
2635 args->timeo = data->timeo;
2636 args->retrans = data->retrans;
2637 args->acregmin = data->acregmin;
2638 args->acregmax = data->acregmax;
2639 args->acdirmin = data->acdirmin;
2640 args->acdirmax = data->acdirmax;
2641 args->nfs_server.protocol = data->proto;
2642 nfs_validate_transport_protocol(args);
2643
2644 break;
2645 default:
2646 return NFS_TEXT_DATA;
2647 }
2648
2649 return 0;
2650
2651 out_no_data:
2652 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2653 return -EINVAL;
2654
2655 out_inval_auth:
2656 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2657 data->auth_flavourlen);
2658 return -EINVAL;
2659
2660 out_no_address:
2661 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2662 return -EINVAL;
2663 }
2664
2665 /*
2666 * NFS v4 module parameters need to stay in the
2667 * NFS client for backwards compatibility
2668 */
2669 unsigned int nfs_callback_set_tcpport;
2670 unsigned short nfs_callback_tcpport;
2671 /* Default cache timeout is 10 minutes */
2672 unsigned int nfs_idmap_cache_timeout = 600;
2673 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2674 bool nfs4_disable_idmapping = true;
2675 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2676 unsigned short send_implementation_id = 1;
2677 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2678
2679 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2680 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2681 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2682 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2683 EXPORT_SYMBOL_GPL(max_session_slots);
2684 EXPORT_SYMBOL_GPL(send_implementation_id);
2685 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2686
2687 #define NFS_CALLBACK_MAXPORTNR (65535U)
2688
2689 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2690 {
2691 unsigned long num;
2692 int ret;
2693
2694 if (!val)
2695 return -EINVAL;
2696 ret = kstrtoul(val, 0, &num);
2697 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2698 return -EINVAL;
2699 *((unsigned int *)kp->arg) = num;
2700 return 0;
2701 }
2702 static struct kernel_param_ops param_ops_portnr = {
2703 .set = param_set_portnr,
2704 .get = param_get_uint,
2705 };
2706 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2707
2708 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2709 module_param(nfs_idmap_cache_timeout, int, 0644);
2710 module_param(nfs4_disable_idmapping, bool, 0644);
2711 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2712 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2713 MODULE_PARM_DESC(nfs4_disable_idmapping,
2714 "Turn off NFSv4 idmapping when using 'sec=sys'");
2715 module_param(max_session_slots, ushort, 0644);
2716 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2717 "requests the client will negotiate");
2718 module_param(send_implementation_id, ushort, 0644);
2719 MODULE_PARM_DESC(send_implementation_id,
2720 "Send implementation ID with NFSv4.1 exchange_id");
2721 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2722
2723 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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