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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
[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 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_UNIX;
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 * Match the requested auth flavors with the list returned by
1609 * the server. Returns zero and sets the mount's authentication
1610 * flavor on success; returns -EACCES if server does not support
1611 * the requested flavor.
1612 */
1613 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1614 struct nfs_mount_request *request)
1615 {
1616 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1617
1618 /*
1619 * Certain releases of Linux's mountd return an empty
1620 * flavor list. To prevent behavioral regression with
1621 * these servers (ie. rejecting mounts that used to
1622 * succeed), revert to pre-2.6.32 behavior (no checking)
1623 * if the returned flavor list is empty.
1624 */
1625 if (server_authlist_len == 0)
1626 return 0;
1627
1628 /*
1629 * We avoid sophisticated negotiating here, as there are
1630 * plenty of cases where we can get it wrong, providing
1631 * either too little or too much security.
1632 *
1633 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1634 * flavor listed first. However, some servers list
1635 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1636 * preferred default, in args->auth_flavors[0] if user
1637 * didn't specify sec= mount option.
1638 */
1639 for (i = 0; i < args->auth_flavor_len; i++)
1640 for (j = 0; j < server_authlist_len; j++)
1641 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1642 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1643 request->auth_flavs[j]);
1644 args->auth_flavors[0] = request->auth_flavs[j];
1645 return 0;
1646 }
1647
1648 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1649 nfs_umount(request);
1650 return -EACCES;
1651 }
1652
1653 /*
1654 * Use the remote server's MOUNT service to request the NFS file handle
1655 * corresponding to the provided path.
1656 */
1657 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1658 struct nfs_fh *root_fh)
1659 {
1660 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1661 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1662 struct nfs_mount_request request = {
1663 .sap = (struct sockaddr *)
1664 &args->mount_server.address,
1665 .dirpath = args->nfs_server.export_path,
1666 .protocol = args->mount_server.protocol,
1667 .fh = root_fh,
1668 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1669 .auth_flav_len = &server_authlist_len,
1670 .auth_flavs = server_authlist,
1671 .net = args->net,
1672 };
1673 int status;
1674
1675 if (args->mount_server.version == 0) {
1676 switch (args->version) {
1677 default:
1678 args->mount_server.version = NFS_MNT3_VERSION;
1679 break;
1680 case 2:
1681 args->mount_server.version = NFS_MNT_VERSION;
1682 }
1683 }
1684 request.version = args->mount_server.version;
1685
1686 if (args->mount_server.hostname)
1687 request.hostname = args->mount_server.hostname;
1688 else
1689 request.hostname = args->nfs_server.hostname;
1690
1691 /*
1692 * Construct the mount server's address.
1693 */
1694 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1695 memcpy(request.sap, &args->nfs_server.address,
1696 args->nfs_server.addrlen);
1697 args->mount_server.addrlen = args->nfs_server.addrlen;
1698 }
1699 request.salen = args->mount_server.addrlen;
1700 nfs_set_port(request.sap, &args->mount_server.port, 0);
1701
1702 /*
1703 * Now ask the mount server to map our export path
1704 * to a file handle.
1705 */
1706 status = nfs_mount(&request);
1707 if (status != 0) {
1708 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1709 request.hostname, status);
1710 return status;
1711 }
1712
1713 /*
1714 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1715 */
1716 if (args->mount_server.version != NFS_MNT3_VERSION)
1717 return 0;
1718 return nfs_walk_authlist(args, &request);
1719 }
1720
1721 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1722 struct nfs_mount_info *mount_info,
1723 struct nfs_subversion *nfs_mod)
1724 {
1725 int status;
1726 struct nfs_server *server;
1727
1728 if (mount_info->parsed->need_mount) {
1729 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1730 if (status)
1731 return ERR_PTR(status);
1732 }
1733
1734 /* Get a volume representation */
1735 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1736 if (IS_ERR(server))
1737 return ERR_CAST(server);
1738
1739 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1740 }
1741 EXPORT_SYMBOL_GPL(nfs_try_mount);
1742
1743 /*
1744 * Split "dev_name" into "hostname:export_path".
1745 *
1746 * The leftmost colon demarks the split between the server's hostname
1747 * and the export path. If the hostname starts with a left square
1748 * bracket, then it may contain colons.
1749 *
1750 * Note: caller frees hostname and export path, even on error.
1751 */
1752 static int nfs_parse_devname(const char *dev_name,
1753 char **hostname, size_t maxnamlen,
1754 char **export_path, size_t maxpathlen)
1755 {
1756 size_t len;
1757 char *end;
1758
1759 /* Is the host name protected with square brakcets? */
1760 if (*dev_name == '[') {
1761 end = strchr(++dev_name, ']');
1762 if (end == NULL || end[1] != ':')
1763 goto out_bad_devname;
1764
1765 len = end - dev_name;
1766 end++;
1767 } else {
1768 char *comma;
1769
1770 end = strchr(dev_name, ':');
1771 if (end == NULL)
1772 goto out_bad_devname;
1773 len = end - dev_name;
1774
1775 /* kill possible hostname list: not supported */
1776 comma = strchr(dev_name, ',');
1777 if (comma != NULL && comma < end)
1778 *comma = 0;
1779 }
1780
1781 if (len > maxnamlen)
1782 goto out_hostname;
1783
1784 /* N.B. caller will free nfs_server.hostname in all cases */
1785 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1786 if (*hostname == NULL)
1787 goto out_nomem;
1788 len = strlen(++end);
1789 if (len > maxpathlen)
1790 goto out_path;
1791 *export_path = kstrndup(end, len, GFP_KERNEL);
1792 if (!*export_path)
1793 goto out_nomem;
1794
1795 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1796 return 0;
1797
1798 out_bad_devname:
1799 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1800 return -EINVAL;
1801
1802 out_nomem:
1803 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1804 return -ENOMEM;
1805
1806 out_hostname:
1807 dfprintk(MOUNT, "NFS: server hostname too long\n");
1808 return -ENAMETOOLONG;
1809
1810 out_path:
1811 dfprintk(MOUNT, "NFS: export pathname too long\n");
1812 return -ENAMETOOLONG;
1813 }
1814
1815 /*
1816 * Validate the NFS2/NFS3 mount data
1817 * - fills in the mount root filehandle
1818 *
1819 * For option strings, user space handles the following behaviors:
1820 *
1821 * + DNS: mapping server host name to IP address ("addr=" option)
1822 *
1823 * + failure mode: how to behave if a mount request can't be handled
1824 * immediately ("fg/bg" option)
1825 *
1826 * + retry: how often to retry a mount request ("retry=" option)
1827 *
1828 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1829 * mountproto=tcp after mountproto=udp, and so on
1830 */
1831 static int nfs23_validate_mount_data(void *options,
1832 struct nfs_parsed_mount_data *args,
1833 struct nfs_fh *mntfh,
1834 const char *dev_name)
1835 {
1836 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1837 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1838
1839 if (data == NULL)
1840 goto out_no_data;
1841
1842 args->version = NFS_DEFAULT_VERSION;
1843 switch (data->version) {
1844 case 1:
1845 data->namlen = 0;
1846 case 2:
1847 data->bsize = 0;
1848 case 3:
1849 if (data->flags & NFS_MOUNT_VER3)
1850 goto out_no_v3;
1851 data->root.size = NFS2_FHSIZE;
1852 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1853 case 4:
1854 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1855 goto out_no_sec;
1856 case 5:
1857 memset(data->context, 0, sizeof(data->context));
1858 case 6:
1859 if (data->flags & NFS_MOUNT_VER3) {
1860 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1861 goto out_invalid_fh;
1862 mntfh->size = data->root.size;
1863 args->version = 3;
1864 } else {
1865 mntfh->size = NFS2_FHSIZE;
1866 args->version = 2;
1867 }
1868
1869
1870 memcpy(mntfh->data, data->root.data, mntfh->size);
1871 if (mntfh->size < sizeof(mntfh->data))
1872 memset(mntfh->data + mntfh->size, 0,
1873 sizeof(mntfh->data) - mntfh->size);
1874
1875 /*
1876 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1877 * can deal with.
1878 */
1879 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1880 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1881 args->rsize = data->rsize;
1882 args->wsize = data->wsize;
1883 args->timeo = data->timeo;
1884 args->retrans = data->retrans;
1885 args->acregmin = data->acregmin;
1886 args->acregmax = data->acregmax;
1887 args->acdirmin = data->acdirmin;
1888 args->acdirmax = data->acdirmax;
1889 args->need_mount = false;
1890
1891 memcpy(sap, &data->addr, sizeof(data->addr));
1892 args->nfs_server.addrlen = sizeof(data->addr);
1893 args->nfs_server.port = ntohs(data->addr.sin_port);
1894 if (!nfs_verify_server_address(sap))
1895 goto out_no_address;
1896
1897 if (!(data->flags & NFS_MOUNT_TCP))
1898 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1899 /* N.B. caller will free nfs_server.hostname in all cases */
1900 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1901 args->namlen = data->namlen;
1902 args->bsize = data->bsize;
1903
1904 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1905 args->auth_flavors[0] = data->pseudoflavor;
1906 if (!args->nfs_server.hostname)
1907 goto out_nomem;
1908
1909 if (!(data->flags & NFS_MOUNT_NONLM))
1910 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1911 NFS_MOUNT_LOCAL_FCNTL);
1912 else
1913 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1914 NFS_MOUNT_LOCAL_FCNTL);
1915 /*
1916 * The legacy version 6 binary mount data from userspace has a
1917 * field used only to transport selinux information into the
1918 * the kernel. To continue to support that functionality we
1919 * have a touch of selinux knowledge here in the NFS code. The
1920 * userspace code converted context=blah to just blah so we are
1921 * converting back to the full string selinux understands.
1922 */
1923 if (data->context[0]){
1924 #ifdef CONFIG_SECURITY_SELINUX
1925 int rc;
1926 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1927 if (!opts_str)
1928 return -ENOMEM;
1929 strcpy(opts_str, "context=");
1930 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1931 strcat(opts_str, &data->context[0]);
1932 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1933 kfree(opts_str);
1934 if (rc)
1935 return rc;
1936 #else
1937 return -EINVAL;
1938 #endif
1939 }
1940
1941 break;
1942 default:
1943 return NFS_TEXT_DATA;
1944 }
1945
1946 #if !IS_ENABLED(CONFIG_NFS_V3)
1947 if (args->version == 3)
1948 goto out_v3_not_compiled;
1949 #endif /* !CONFIG_NFS_V3 */
1950
1951 return 0;
1952
1953 out_no_data:
1954 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1955 return -EINVAL;
1956
1957 out_no_v3:
1958 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1959 data->version);
1960 return -EINVAL;
1961
1962 out_no_sec:
1963 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1964 return -EINVAL;
1965
1966 #if !IS_ENABLED(CONFIG_NFS_V3)
1967 out_v3_not_compiled:
1968 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1969 return -EPROTONOSUPPORT;
1970 #endif /* !CONFIG_NFS_V3 */
1971
1972 out_nomem:
1973 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1974 return -ENOMEM;
1975
1976 out_no_address:
1977 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1978 return -EINVAL;
1979
1980 out_invalid_fh:
1981 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1982 return -EINVAL;
1983 }
1984
1985 #if IS_ENABLED(CONFIG_NFS_V4)
1986 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1987 void *options,
1988 struct nfs_parsed_mount_data *args,
1989 struct nfs_fh *mntfh,
1990 const char *dev_name)
1991 {
1992 if (fs_type == &nfs_fs_type)
1993 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1994 return nfs4_validate_mount_data(options, args, dev_name);
1995 }
1996 #else
1997 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1998 void *options,
1999 struct nfs_parsed_mount_data *args,
2000 struct nfs_fh *mntfh,
2001 const char *dev_name)
2002 {
2003 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2004 }
2005 #endif
2006
2007 static int nfs_validate_text_mount_data(void *options,
2008 struct nfs_parsed_mount_data *args,
2009 const char *dev_name)
2010 {
2011 int port = 0;
2012 int max_namelen = PAGE_SIZE;
2013 int max_pathlen = NFS_MAXPATHLEN;
2014 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2015
2016 if (nfs_parse_mount_options((char *)options, args) == 0)
2017 return -EINVAL;
2018
2019 if (!nfs_verify_server_address(sap))
2020 goto out_no_address;
2021
2022 if (args->version == 4) {
2023 #if IS_ENABLED(CONFIG_NFS_V4)
2024 port = NFS_PORT;
2025 max_namelen = NFS4_MAXNAMLEN;
2026 max_pathlen = NFS4_MAXPATHLEN;
2027 nfs_validate_transport_protocol(args);
2028 nfs4_validate_mount_flags(args);
2029 #else
2030 goto out_v4_not_compiled;
2031 #endif /* CONFIG_NFS_V4 */
2032 } else
2033 nfs_set_mount_transport_protocol(args);
2034
2035 nfs_set_port(sap, &args->nfs_server.port, port);
2036
2037 if (args->auth_flavor_len > 1)
2038 goto out_bad_auth;
2039
2040 return nfs_parse_devname(dev_name,
2041 &args->nfs_server.hostname,
2042 max_namelen,
2043 &args->nfs_server.export_path,
2044 max_pathlen);
2045
2046 #if !IS_ENABLED(CONFIG_NFS_V4)
2047 out_v4_not_compiled:
2048 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2049 return -EPROTONOSUPPORT;
2050 #endif /* !CONFIG_NFS_V4 */
2051
2052 out_no_address:
2053 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2054 return -EINVAL;
2055
2056 out_bad_auth:
2057 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2058 return -EINVAL;
2059 }
2060
2061 static int
2062 nfs_compare_remount_data(struct nfs_server *nfss,
2063 struct nfs_parsed_mount_data *data)
2064 {
2065 if (data->flags != nfss->flags ||
2066 data->rsize != nfss->rsize ||
2067 data->wsize != nfss->wsize ||
2068 data->retrans != nfss->client->cl_timeout->to_retries ||
2069 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2070 data->acregmin != nfss->acregmin / HZ ||
2071 data->acregmax != nfss->acregmax / HZ ||
2072 data->acdirmin != nfss->acdirmin / HZ ||
2073 data->acdirmax != nfss->acdirmax / HZ ||
2074 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2075 data->nfs_server.port != nfss->port ||
2076 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2077 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2078 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2079 return -EINVAL;
2080
2081 return 0;
2082 }
2083
2084 int
2085 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2086 {
2087 int error;
2088 struct nfs_server *nfss = sb->s_fs_info;
2089 struct nfs_parsed_mount_data *data;
2090 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2091 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2092 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2093
2094 /*
2095 * Userspace mount programs that send binary options generally send
2096 * them populated with default values. We have no way to know which
2097 * ones were explicitly specified. Fall back to legacy behavior and
2098 * just return success.
2099 */
2100 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2101 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2102 options->version <= 6))))
2103 return 0;
2104
2105 data = kzalloc(sizeof(*data), GFP_KERNEL);
2106 if (data == NULL)
2107 return -ENOMEM;
2108
2109 /* fill out struct with values from existing mount */
2110 data->flags = nfss->flags;
2111 data->rsize = nfss->rsize;
2112 data->wsize = nfss->wsize;
2113 data->retrans = nfss->client->cl_timeout->to_retries;
2114 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2115 data->acregmin = nfss->acregmin / HZ;
2116 data->acregmax = nfss->acregmax / HZ;
2117 data->acdirmin = nfss->acdirmin / HZ;
2118 data->acdirmax = nfss->acdirmax / HZ;
2119 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2120 data->nfs_server.port = nfss->port;
2121 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2122 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2123 data->nfs_server.addrlen);
2124
2125 /* overwrite those values with any that were specified */
2126 error = nfs_parse_mount_options((char *)options, data);
2127 if (error < 0)
2128 goto out;
2129
2130 /*
2131 * noac is a special case. It implies -o sync, but that's not
2132 * necessarily reflected in the mtab options. do_remount_sb
2133 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2134 * remount options, so we have to explicitly reset it.
2135 */
2136 if (data->flags & NFS_MOUNT_NOAC)
2137 *flags |= MS_SYNCHRONOUS;
2138
2139 /* compare new mount options with old ones */
2140 error = nfs_compare_remount_data(nfss, data);
2141 out:
2142 kfree(data);
2143 return error;
2144 }
2145 EXPORT_SYMBOL_GPL(nfs_remount);
2146
2147 /*
2148 * Initialise the common bits of the superblock
2149 */
2150 inline void nfs_initialise_sb(struct super_block *sb)
2151 {
2152 struct nfs_server *server = NFS_SB(sb);
2153
2154 sb->s_magic = NFS_SUPER_MAGIC;
2155
2156 /* We probably want something more informative here */
2157 snprintf(sb->s_id, sizeof(sb->s_id),
2158 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2159
2160 if (sb->s_blocksize == 0)
2161 sb->s_blocksize = nfs_block_bits(server->wsize,
2162 &sb->s_blocksize_bits);
2163
2164 sb->s_bdi = &server->backing_dev_info;
2165
2166 nfs_super_set_maxbytes(sb, server->maxfilesize);
2167 }
2168
2169 /*
2170 * Finish setting up an NFS2/3 superblock
2171 */
2172 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2173 {
2174 struct nfs_parsed_mount_data *data = mount_info->parsed;
2175 struct nfs_server *server = NFS_SB(sb);
2176
2177 sb->s_blocksize_bits = 0;
2178 sb->s_blocksize = 0;
2179 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2180 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2181 if (data && data->bsize)
2182 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2183
2184 if (server->nfs_client->rpc_ops->version != 2) {
2185 /* The VFS shouldn't apply the umask to mode bits. We will do
2186 * so ourselves when necessary.
2187 */
2188 sb->s_flags |= MS_POSIXACL;
2189 sb->s_time_gran = 1;
2190 }
2191
2192 nfs_initialise_sb(sb);
2193 }
2194 EXPORT_SYMBOL_GPL(nfs_fill_super);
2195
2196 /*
2197 * Finish setting up a cloned NFS2/3/4 superblock
2198 */
2199 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2200 {
2201 const struct super_block *old_sb = mount_info->cloned->sb;
2202 struct nfs_server *server = NFS_SB(sb);
2203
2204 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2205 sb->s_blocksize = old_sb->s_blocksize;
2206 sb->s_maxbytes = old_sb->s_maxbytes;
2207 sb->s_xattr = old_sb->s_xattr;
2208 sb->s_op = old_sb->s_op;
2209 sb->s_time_gran = 1;
2210
2211 if (server->nfs_client->rpc_ops->version != 2) {
2212 /* The VFS shouldn't apply the umask to mode bits. We will do
2213 * so ourselves when necessary.
2214 */
2215 sb->s_flags |= MS_POSIXACL;
2216 }
2217
2218 nfs_initialise_sb(sb);
2219 }
2220
2221 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2222 {
2223 const struct nfs_server *a = s->s_fs_info;
2224 const struct rpc_clnt *clnt_a = a->client;
2225 const struct rpc_clnt *clnt_b = b->client;
2226
2227 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2228 goto Ebusy;
2229 if (a->nfs_client != b->nfs_client)
2230 goto Ebusy;
2231 if (a->flags != b->flags)
2232 goto Ebusy;
2233 if (a->wsize != b->wsize)
2234 goto Ebusy;
2235 if (a->rsize != b->rsize)
2236 goto Ebusy;
2237 if (a->acregmin != b->acregmin)
2238 goto Ebusy;
2239 if (a->acregmax != b->acregmax)
2240 goto Ebusy;
2241 if (a->acdirmin != b->acdirmin)
2242 goto Ebusy;
2243 if (a->acdirmax != b->acdirmax)
2244 goto Ebusy;
2245 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2246 goto Ebusy;
2247 return 1;
2248 Ebusy:
2249 return 0;
2250 }
2251
2252 struct nfs_sb_mountdata {
2253 struct nfs_server *server;
2254 int mntflags;
2255 };
2256
2257 static int nfs_set_super(struct super_block *s, void *data)
2258 {
2259 struct nfs_sb_mountdata *sb_mntdata = data;
2260 struct nfs_server *server = sb_mntdata->server;
2261 int ret;
2262
2263 s->s_flags = sb_mntdata->mntflags;
2264 s->s_fs_info = server;
2265 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2266 ret = set_anon_super(s, server);
2267 if (ret == 0)
2268 server->s_dev = s->s_dev;
2269 return ret;
2270 }
2271
2272 static int nfs_compare_super_address(struct nfs_server *server1,
2273 struct nfs_server *server2)
2274 {
2275 struct sockaddr *sap1, *sap2;
2276
2277 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2278 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2279
2280 if (sap1->sa_family != sap2->sa_family)
2281 return 0;
2282
2283 switch (sap1->sa_family) {
2284 case AF_INET: {
2285 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2286 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2287 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2288 return 0;
2289 if (sin1->sin_port != sin2->sin_port)
2290 return 0;
2291 break;
2292 }
2293 case AF_INET6: {
2294 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2295 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2296 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2297 return 0;
2298 if (sin1->sin6_port != sin2->sin6_port)
2299 return 0;
2300 break;
2301 }
2302 default:
2303 return 0;
2304 }
2305
2306 return 1;
2307 }
2308
2309 static int nfs_compare_super(struct super_block *sb, void *data)
2310 {
2311 struct nfs_sb_mountdata *sb_mntdata = data;
2312 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2313 int mntflags = sb_mntdata->mntflags;
2314
2315 if (!nfs_compare_super_address(old, server))
2316 return 0;
2317 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2318 if (old->flags & NFS_MOUNT_UNSHARED)
2319 return 0;
2320 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2321 return 0;
2322 return nfs_compare_mount_options(sb, server, mntflags);
2323 }
2324
2325 #ifdef CONFIG_NFS_FSCACHE
2326 static void nfs_get_cache_cookie(struct super_block *sb,
2327 struct nfs_parsed_mount_data *parsed,
2328 struct nfs_clone_mount *cloned)
2329 {
2330 struct nfs_server *nfss = NFS_SB(sb);
2331 char *uniq = NULL;
2332 int ulen = 0;
2333
2334 nfss->fscache_key = NULL;
2335 nfss->fscache = NULL;
2336
2337 if (parsed) {
2338 if (!(parsed->options & NFS_OPTION_FSCACHE))
2339 return;
2340 if (parsed->fscache_uniq) {
2341 uniq = parsed->fscache_uniq;
2342 ulen = strlen(parsed->fscache_uniq);
2343 }
2344 } else if (cloned) {
2345 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2346 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2347 return;
2348 if (mnt_s->fscache_key) {
2349 uniq = mnt_s->fscache_key->key.uniquifier;
2350 ulen = mnt_s->fscache_key->key.uniq_len;
2351 };
2352 } else
2353 return;
2354
2355 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2356 }
2357 #else
2358 static void nfs_get_cache_cookie(struct super_block *sb,
2359 struct nfs_parsed_mount_data *parsed,
2360 struct nfs_clone_mount *cloned)
2361 {
2362 }
2363 #endif
2364
2365 static int nfs_bdi_register(struct nfs_server *server)
2366 {
2367 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2368 }
2369
2370 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2371 struct nfs_mount_info *mount_info)
2372 {
2373 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2374 }
2375 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2376
2377 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2378 struct nfs_mount_info *mount_info)
2379 {
2380 /* clone any lsm security options from the parent to the new sb */
2381 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2382 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2383 return -ESTALE;
2384 return 0;
2385 }
2386 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2387
2388 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2389 int flags, const char *dev_name,
2390 struct nfs_mount_info *mount_info,
2391 struct nfs_subversion *nfs_mod)
2392 {
2393 struct super_block *s;
2394 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2395 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2396 struct nfs_sb_mountdata sb_mntdata = {
2397 .mntflags = flags,
2398 .server = server,
2399 };
2400 int error;
2401
2402 if (server->flags & NFS_MOUNT_UNSHARED)
2403 compare_super = NULL;
2404
2405 /* -o noac implies -o sync */
2406 if (server->flags & NFS_MOUNT_NOAC)
2407 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2408
2409 /* Get a superblock - note that we may end up sharing one that already exists */
2410 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2411 if (IS_ERR(s)) {
2412 mntroot = ERR_CAST(s);
2413 goto out_err_nosb;
2414 }
2415
2416 if (s->s_fs_info != server) {
2417 nfs_free_server(server);
2418 server = NULL;
2419 } else {
2420 error = nfs_bdi_register(server);
2421 if (error) {
2422 mntroot = ERR_PTR(error);
2423 goto error_splat_bdi;
2424 }
2425 }
2426
2427 if (!s->s_root) {
2428 /* initial superblock/root creation */
2429 mount_info->fill_super(s, mount_info);
2430 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2431 }
2432
2433 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2434 if (IS_ERR(mntroot))
2435 goto error_splat_super;
2436
2437 error = mount_info->set_security(s, mntroot, mount_info);
2438 if (error)
2439 goto error_splat_root;
2440
2441 s->s_flags |= MS_ACTIVE;
2442
2443 out:
2444 return mntroot;
2445
2446 out_err_nosb:
2447 nfs_free_server(server);
2448 goto out;
2449
2450 error_splat_root:
2451 dput(mntroot);
2452 mntroot = ERR_PTR(error);
2453 error_splat_super:
2454 if (server && !s->s_root)
2455 bdi_unregister(&server->backing_dev_info);
2456 error_splat_bdi:
2457 deactivate_locked_super(s);
2458 goto out;
2459 }
2460 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2461
2462 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2463 int flags, const char *dev_name, void *raw_data)
2464 {
2465 struct nfs_mount_info mount_info = {
2466 .fill_super = nfs_fill_super,
2467 .set_security = nfs_set_sb_security,
2468 };
2469 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2470 struct nfs_subversion *nfs_mod;
2471 int error;
2472
2473 mount_info.parsed = nfs_alloc_parsed_mount_data();
2474 mount_info.mntfh = nfs_alloc_fhandle();
2475 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2476 goto out;
2477
2478 /* Validate the mount data */
2479 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2480 if (error == NFS_TEXT_DATA)
2481 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2482 if (error < 0) {
2483 mntroot = ERR_PTR(error);
2484 goto out;
2485 }
2486
2487 nfs_mod = get_nfs_version(mount_info.parsed->version);
2488 if (IS_ERR(nfs_mod)) {
2489 mntroot = ERR_CAST(nfs_mod);
2490 goto out;
2491 }
2492
2493 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2494
2495 put_nfs_version(nfs_mod);
2496 out:
2497 nfs_free_parsed_mount_data(mount_info.parsed);
2498 nfs_free_fhandle(mount_info.mntfh);
2499 return mntroot;
2500 }
2501 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2502
2503 /*
2504 * Ensure that we unregister the bdi before kill_anon_super
2505 * releases the device name
2506 */
2507 void nfs_put_super(struct super_block *s)
2508 {
2509 struct nfs_server *server = NFS_SB(s);
2510
2511 bdi_unregister(&server->backing_dev_info);
2512 }
2513 EXPORT_SYMBOL_GPL(nfs_put_super);
2514
2515 /*
2516 * Destroy an NFS2/3 superblock
2517 */
2518 void nfs_kill_super(struct super_block *s)
2519 {
2520 struct nfs_server *server = NFS_SB(s);
2521
2522 kill_anon_super(s);
2523 nfs_fscache_release_super_cookie(s);
2524 nfs_free_server(server);
2525 }
2526 EXPORT_SYMBOL_GPL(nfs_kill_super);
2527
2528 /*
2529 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2530 */
2531 static struct dentry *
2532 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2533 const char *dev_name, void *raw_data)
2534 {
2535 struct nfs_clone_mount *data = raw_data;
2536 struct nfs_mount_info mount_info = {
2537 .fill_super = nfs_clone_super,
2538 .set_security = nfs_clone_sb_security,
2539 .cloned = data,
2540 };
2541 struct nfs_server *server;
2542 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2543 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2544
2545 dprintk("--> nfs_xdev_mount()\n");
2546
2547 mount_info.mntfh = mount_info.cloned->fh;
2548
2549 /* create a new volume representation */
2550 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2551
2552 if (IS_ERR(server))
2553 mntroot = ERR_CAST(server);
2554 else
2555 mntroot = nfs_fs_mount_common(server, flags,
2556 dev_name, &mount_info, nfs_mod);
2557
2558 dprintk("<-- nfs_xdev_mount() = %ld\n",
2559 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2560 return mntroot;
2561 }
2562
2563 #if IS_ENABLED(CONFIG_NFS_V4)
2564
2565 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2566 {
2567 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2568 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2569 }
2570
2571 /*
2572 * Validate NFSv4 mount options
2573 */
2574 static int nfs4_validate_mount_data(void *options,
2575 struct nfs_parsed_mount_data *args,
2576 const char *dev_name)
2577 {
2578 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2579 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2580 char *c;
2581
2582 if (data == NULL)
2583 goto out_no_data;
2584
2585 args->version = 4;
2586
2587 switch (data->version) {
2588 case 1:
2589 if (data->host_addrlen > sizeof(args->nfs_server.address))
2590 goto out_no_address;
2591 if (data->host_addrlen == 0)
2592 goto out_no_address;
2593 args->nfs_server.addrlen = data->host_addrlen;
2594 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2595 return -EFAULT;
2596 if (!nfs_verify_server_address(sap))
2597 goto out_no_address;
2598 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2599
2600 if (data->auth_flavourlen) {
2601 if (data->auth_flavourlen > 1)
2602 goto out_inval_auth;
2603 if (copy_from_user(&args->auth_flavors[0],
2604 data->auth_flavours,
2605 sizeof(args->auth_flavors[0])))
2606 return -EFAULT;
2607 }
2608
2609 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2610 if (IS_ERR(c))
2611 return PTR_ERR(c);
2612 args->nfs_server.hostname = c;
2613
2614 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2615 if (IS_ERR(c))
2616 return PTR_ERR(c);
2617 args->nfs_server.export_path = c;
2618 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2619
2620 c = strndup_user(data->client_addr.data, 16);
2621 if (IS_ERR(c))
2622 return PTR_ERR(c);
2623 args->client_address = c;
2624
2625 /*
2626 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2627 * can deal with.
2628 */
2629
2630 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2631 args->rsize = data->rsize;
2632 args->wsize = data->wsize;
2633 args->timeo = data->timeo;
2634 args->retrans = data->retrans;
2635 args->acregmin = data->acregmin;
2636 args->acregmax = data->acregmax;
2637 args->acdirmin = data->acdirmin;
2638 args->acdirmax = data->acdirmax;
2639 args->nfs_server.protocol = data->proto;
2640 nfs_validate_transport_protocol(args);
2641
2642 break;
2643 default:
2644 return NFS_TEXT_DATA;
2645 }
2646
2647 return 0;
2648
2649 out_no_data:
2650 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2651 return -EINVAL;
2652
2653 out_inval_auth:
2654 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2655 data->auth_flavourlen);
2656 return -EINVAL;
2657
2658 out_no_address:
2659 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2660 return -EINVAL;
2661 }
2662
2663 /*
2664 * NFS v4 module parameters need to stay in the
2665 * NFS client for backwards compatibility
2666 */
2667 unsigned int nfs_callback_set_tcpport;
2668 unsigned short nfs_callback_tcpport;
2669 /* Default cache timeout is 10 minutes */
2670 unsigned int nfs_idmap_cache_timeout = 600;
2671 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2672 bool nfs4_disable_idmapping = true;
2673 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2674 unsigned short send_implementation_id = 1;
2675 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2676
2677 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2678 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2679 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2680 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2681 EXPORT_SYMBOL_GPL(max_session_slots);
2682 EXPORT_SYMBOL_GPL(send_implementation_id);
2683 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2684
2685 #define NFS_CALLBACK_MAXPORTNR (65535U)
2686
2687 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2688 {
2689 unsigned long num;
2690 int ret;
2691
2692 if (!val)
2693 return -EINVAL;
2694 ret = kstrtoul(val, 0, &num);
2695 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2696 return -EINVAL;
2697 *((unsigned int *)kp->arg) = num;
2698 return 0;
2699 }
2700 static struct kernel_param_ops param_ops_portnr = {
2701 .set = param_set_portnr,
2702 .get = param_get_uint,
2703 };
2704 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2705
2706 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2707 module_param(nfs_idmap_cache_timeout, int, 0644);
2708 module_param(nfs4_disable_idmapping, bool, 0644);
2709 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2710 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2711 MODULE_PARM_DESC(nfs4_disable_idmapping,
2712 "Turn off NFSv4 idmapping when using 'sec=sys'");
2713 module_param(max_session_slots, ushort, 0644);
2714 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2715 "requests the client will negotiate");
2716 module_param(send_implementation_id, ushort, 0644);
2717 MODULE_PARM_DESC(send_implementation_id,
2718 "Send implementation ID with NFSv4.1 exchange_id");
2719 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2720 MODULE_ALIAS("nfs4");
2721
2722 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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