1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/addr.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/sunrpc/xprtsock.h>
38 #include <linux/sunrpc/xprtrdma.h>
39 #include <linux/nfs_fs.h>
40 #include <linux/nfs_mount.h>
41 #include <linux/nfs4_mount.h>
42 #include <linux/lockd/bind.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/namei.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "nfs4session.h"
67 #include "pnfs.h"
68 #include "nfs.h"
69
70 #define NFSDBG_FACILITY NFSDBG_VFS
71 #define NFS_TEXT_DATA 1
72
73 #if IS_ENABLED(CONFIG_NFS_V3)
74 #define NFS_DEFAULT_VERSION 3
75 #else
76 #define NFS_DEFAULT_VERSION 2
77 #endif
78
79 enum {
80 /* Mount options that take no arguments */
81 Opt_soft, Opt_hard,
82 Opt_posix, Opt_noposix,
83 Opt_cto, Opt_nocto,
84 Opt_ac, Opt_noac,
85 Opt_lock, Opt_nolock,
86 Opt_udp, Opt_tcp, Opt_rdma,
87 Opt_acl, Opt_noacl,
88 Opt_rdirplus, Opt_nordirplus,
89 Opt_sharecache, Opt_nosharecache,
90 Opt_resvport, Opt_noresvport,
91 Opt_fscache, Opt_nofscache,
92 Opt_migration, Opt_nomigration,
93
94 /* Mount options that take integer arguments */
95 Opt_port,
96 Opt_rsize, Opt_wsize, Opt_bsize,
97 Opt_timeo, Opt_retrans,
98 Opt_acregmin, Opt_acregmax,
99 Opt_acdirmin, Opt_acdirmax,
100 Opt_actimeo,
101 Opt_namelen,
102 Opt_mountport,
103 Opt_mountvers,
104 Opt_minorversion,
105
106 /* Mount options that take string arguments */
107 Opt_nfsvers,
108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
109 Opt_addr, Opt_mountaddr, Opt_clientaddr,
110 Opt_lookupcache,
111 Opt_fscache_uniq,
112 Opt_local_lock,
113
114 /* Special mount options */
115 Opt_userspace, Opt_deprecated, Opt_sloppy,
116
117 Opt_err
118 };
119
120 static const match_table_t nfs_mount_option_tokens = {
121 { Opt_userspace, "bg" },
122 { Opt_userspace, "fg" },
123 { Opt_userspace, "retry=%s" },
124
125 { Opt_sloppy, "sloppy" },
126
127 { Opt_soft, "soft" },
128 { Opt_hard, "hard" },
129 { Opt_deprecated, "intr" },
130 { Opt_deprecated, "nointr" },
131 { Opt_posix, "posix" },
132 { Opt_noposix, "noposix" },
133 { Opt_cto, "cto" },
134 { Opt_nocto, "nocto" },
135 { Opt_ac, "ac" },
136 { Opt_noac, "noac" },
137 { Opt_lock, "lock" },
138 { Opt_nolock, "nolock" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152 { Opt_migration, "migration" },
153 { Opt_nomigration, "nomigration" },
154
155 { Opt_port, "port=%s" },
156 { Opt_rsize, "rsize=%s" },
157 { Opt_wsize, "wsize=%s" },
158 { Opt_bsize, "bsize=%s" },
159 { Opt_timeo, "timeo=%s" },
160 { Opt_retrans, "retrans=%s" },
161 { Opt_acregmin, "acregmin=%s" },
162 { Opt_acregmax, "acregmax=%s" },
163 { Opt_acdirmin, "acdirmin=%s" },
164 { Opt_acdirmax, "acdirmax=%s" },
165 { Opt_actimeo, "actimeo=%s" },
166 { Opt_namelen, "namlen=%s" },
167 { Opt_mountport, "mountport=%s" },
168 { Opt_mountvers, "mountvers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_nfsvers, "nfsvers=%s" },
172 { Opt_nfsvers, "vers=%s" },
173
174 { Opt_sec, "sec=%s" },
175 { Opt_proto, "proto=%s" },
176 { Opt_mountproto, "mountproto=%s" },
177 { Opt_addr, "addr=%s" },
178 { Opt_clientaddr, "clientaddr=%s" },
179 { Opt_mounthost, "mounthost=%s" },
180 { Opt_mountaddr, "mountaddr=%s" },
181
182 { Opt_lookupcache, "lookupcache=%s" },
183 { Opt_fscache_uniq, "fsc=%s" },
184 { Opt_local_lock, "local_lock=%s" },
185
186 /* The following needs to be listed after all other options */
187 { Opt_nfsvers, "v%s" },
188
189 { Opt_err, NULL }
190 };
191
192 enum {
193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
194
195 Opt_xprt_err
196 };
197
198 static const match_table_t nfs_xprt_protocol_tokens = {
199 { Opt_xprt_udp, "udp" },
200 { Opt_xprt_udp6, "udp6" },
201 { Opt_xprt_tcp, "tcp" },
202 { Opt_xprt_tcp6, "tcp6" },
203 { Opt_xprt_rdma, "rdma" },
204
205 { Opt_xprt_err, NULL }
206 };
207
208 enum {
209 Opt_sec_none, Opt_sec_sys,
210 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
211 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
212 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
213
214 Opt_sec_err
215 };
216
217 static const match_table_t nfs_secflavor_tokens = {
218 { Opt_sec_none, "none" },
219 { Opt_sec_none, "null" },
220 { Opt_sec_sys, "sys" },
221
222 { Opt_sec_krb5, "krb5" },
223 { Opt_sec_krb5i, "krb5i" },
224 { Opt_sec_krb5p, "krb5p" },
225
226 { Opt_sec_lkey, "lkey" },
227 { Opt_sec_lkeyi, "lkeyi" },
228 { Opt_sec_lkeyp, "lkeyp" },
229
230 { Opt_sec_spkm, "spkm3" },
231 { Opt_sec_spkmi, "spkm3i" },
232 { Opt_sec_spkmp, "spkm3p" },
233
234 { Opt_sec_err, NULL }
235 };
236
237 enum {
238 Opt_lookupcache_all, Opt_lookupcache_positive,
239 Opt_lookupcache_none,
240
241 Opt_lookupcache_err
242 };
243
244 static match_table_t nfs_lookupcache_tokens = {
245 { Opt_lookupcache_all, "all" },
246 { Opt_lookupcache_positive, "pos" },
247 { Opt_lookupcache_positive, "positive" },
248 { Opt_lookupcache_none, "none" },
249
250 { Opt_lookupcache_err, NULL }
251 };
252
253 enum {
254 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
255 Opt_local_lock_none,
256
257 Opt_local_lock_err
258 };
259
260 static match_table_t nfs_local_lock_tokens = {
261 { Opt_local_lock_all, "all" },
262 { Opt_local_lock_flock, "flock" },
263 { Opt_local_lock_posix, "posix" },
264 { Opt_local_lock_none, "none" },
265
266 { Opt_local_lock_err, NULL }
267 };
268
269 enum {
270 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
271 Opt_vers_4_1, Opt_vers_4_2,
272
273 Opt_vers_err
274 };
275
276 static match_table_t nfs_vers_tokens = {
277 { Opt_vers_2, "2" },
278 { Opt_vers_3, "3" },
279 { Opt_vers_4, "4" },
280 { Opt_vers_4_0, "4.0" },
281 { Opt_vers_4_1, "4.1" },
282 { Opt_vers_4_2, "4.2" },
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 .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 MODULE_ALIAS_FS("nfs4");
337 MODULE_ALIAS("nfs4");
338 EXPORT_SYMBOL_GPL(nfs4_fs_type);
339
register_nfs4_fs(void)340 static int __init register_nfs4_fs(void)
341 {
342 return register_filesystem(&nfs4_fs_type);
343 }
344
unregister_nfs4_fs(void)345 static void unregister_nfs4_fs(void)
346 {
347 unregister_filesystem(&nfs4_fs_type);
348 }
349 #else
register_nfs4_fs(void)350 static int __init register_nfs4_fs(void)
351 {
352 return 0;
353 }
354
unregister_nfs4_fs(void)355 static void unregister_nfs4_fs(void)
356 {
357 }
358 #endif
359
360 static struct shrinker acl_shrinker = {
361 .count_objects = nfs_access_cache_count,
362 .scan_objects = nfs_access_cache_scan,
363 .seeks = DEFAULT_SEEKS,
364 };
365
366 /*
367 * Register the NFS filesystems
368 */
register_nfs_fs(void)369 int __init register_nfs_fs(void)
370 {
371 int ret;
372
373 ret = register_filesystem(&nfs_fs_type);
374 if (ret < 0)
375 goto error_0;
376
377 ret = register_nfs4_fs();
378 if (ret < 0)
379 goto error_1;
380
381 ret = nfs_register_sysctl();
382 if (ret < 0)
383 goto error_2;
384 ret = register_shrinker(&acl_shrinker);
385 if (ret < 0)
386 goto error_3;
387 return 0;
388 error_3:
389 nfs_unregister_sysctl();
390 error_2:
391 unregister_nfs4_fs();
392 error_1:
393 unregister_filesystem(&nfs_fs_type);
394 error_0:
395 return ret;
396 }
397
398 /*
399 * Unregister the NFS filesystems
400 */
unregister_nfs_fs(void)401 void __exit unregister_nfs_fs(void)
402 {
403 unregister_shrinker(&acl_shrinker);
404 nfs_unregister_sysctl();
405 unregister_nfs4_fs();
406 unregister_filesystem(&nfs_fs_type);
407 }
408
nfs_sb_active(struct super_block * sb)409 bool nfs_sb_active(struct super_block *sb)
410 {
411 struct nfs_server *server = NFS_SB(sb);
412
413 if (!atomic_inc_not_zero(&sb->s_active))
414 return false;
415 if (atomic_inc_return(&server->active) != 1)
416 atomic_dec(&sb->s_active);
417 return true;
418 }
419 EXPORT_SYMBOL_GPL(nfs_sb_active);
420
nfs_sb_deactive(struct super_block * sb)421 void nfs_sb_deactive(struct super_block *sb)
422 {
423 struct nfs_server *server = NFS_SB(sb);
424
425 if (atomic_dec_and_test(&server->active))
426 deactivate_super(sb);
427 }
428 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
429
430 /*
431 * Deliver file system statistics to userspace
432 */
nfs_statfs(struct dentry * dentry,struct kstatfs * buf)433 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
434 {
435 struct nfs_server *server = NFS_SB(dentry->d_sb);
436 unsigned char blockbits;
437 unsigned long blockres;
438 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
439 struct nfs_fsstat res;
440 int error = -ENOMEM;
441
442 res.fattr = nfs_alloc_fattr();
443 if (res.fattr == NULL)
444 goto out_err;
445
446 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
447 if (unlikely(error == -ESTALE)) {
448 struct dentry *pd_dentry;
449
450 pd_dentry = dget_parent(dentry);
451 if (pd_dentry != NULL) {
452 nfs_zap_caches(d_inode(pd_dentry));
453 dput(pd_dentry);
454 }
455 }
456 nfs_free_fattr(res.fattr);
457 if (error < 0)
458 goto out_err;
459
460 buf->f_type = NFS_SUPER_MAGIC;
461
462 /*
463 * Current versions of glibc do not correctly handle the
464 * case where f_frsize != f_bsize. Eventually we want to
465 * report the value of wtmult in this field.
466 */
467 buf->f_frsize = dentry->d_sb->s_blocksize;
468
469 /*
470 * On most *nix systems, f_blocks, f_bfree, and f_bavail
471 * are reported in units of f_frsize. Linux hasn't had
472 * an f_frsize field in its statfs struct until recently,
473 * thus historically Linux's sys_statfs reports these
474 * fields in units of f_bsize.
475 */
476 buf->f_bsize = dentry->d_sb->s_blocksize;
477 blockbits = dentry->d_sb->s_blocksize_bits;
478 blockres = (1 << blockbits) - 1;
479 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
480 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
481 buf->f_bavail = (res.abytes + blockres) >> blockbits;
482
483 buf->f_files = res.tfiles;
484 buf->f_ffree = res.afiles;
485
486 buf->f_namelen = server->namelen;
487
488 return 0;
489
490 out_err:
491 dprintk("%s: statfs error = %d\n", __func__, -error);
492 return error;
493 }
494 EXPORT_SYMBOL_GPL(nfs_statfs);
495
496 /*
497 * Map the security flavour number to a name
498 */
nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)499 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
500 {
501 static const struct {
502 rpc_authflavor_t flavour;
503 const char *str;
504 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
505 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
506 { RPC_AUTH_NULL, "null" },
507 { RPC_AUTH_UNIX, "sys" },
508 { RPC_AUTH_GSS_KRB5, "krb5" },
509 { RPC_AUTH_GSS_KRB5I, "krb5i" },
510 { RPC_AUTH_GSS_KRB5P, "krb5p" },
511 { RPC_AUTH_GSS_LKEY, "lkey" },
512 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
513 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
514 { RPC_AUTH_GSS_SPKM, "spkm" },
515 { RPC_AUTH_GSS_SPKMI, "spkmi" },
516 { RPC_AUTH_GSS_SPKMP, "spkmp" },
517 { UINT_MAX, "unknown" }
518 };
519 int i;
520
521 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
522 if (sec_flavours[i].flavour == flavour)
523 break;
524 }
525 return sec_flavours[i].str;
526 }
527
nfs_show_mountd_netid(struct seq_file * m,struct nfs_server * nfss,int showdefaults)528 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
529 int showdefaults)
530 {
531 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
532
533 seq_printf(m, ",mountproto=");
534 switch (sap->sa_family) {
535 case AF_INET:
536 switch (nfss->mountd_protocol) {
537 case IPPROTO_UDP:
538 seq_printf(m, RPCBIND_NETID_UDP);
539 break;
540 case IPPROTO_TCP:
541 seq_printf(m, RPCBIND_NETID_TCP);
542 break;
543 default:
544 if (showdefaults)
545 seq_printf(m, "auto");
546 }
547 break;
548 case AF_INET6:
549 switch (nfss->mountd_protocol) {
550 case IPPROTO_UDP:
551 seq_printf(m, RPCBIND_NETID_UDP6);
552 break;
553 case IPPROTO_TCP:
554 seq_printf(m, RPCBIND_NETID_TCP6);
555 break;
556 default:
557 if (showdefaults)
558 seq_printf(m, "auto");
559 }
560 break;
561 default:
562 if (showdefaults)
563 seq_printf(m, "auto");
564 }
565 }
566
nfs_show_mountd_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)567 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
568 int showdefaults)
569 {
570 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
571
572 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
573 return;
574
575 switch (sap->sa_family) {
576 case AF_INET: {
577 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
578 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
579 break;
580 }
581 case AF_INET6: {
582 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
583 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
584 break;
585 }
586 default:
587 if (showdefaults)
588 seq_printf(m, ",mountaddr=unspecified");
589 }
590
591 if (nfss->mountd_version || showdefaults)
592 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
593 if ((nfss->mountd_port &&
594 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
595 showdefaults)
596 seq_printf(m, ",mountport=%u", nfss->mountd_port);
597
598 nfs_show_mountd_netid(m, nfss, showdefaults);
599 }
600
601 #if IS_ENABLED(CONFIG_NFS_V4)
nfs_show_nfsv4_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)602 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
603 int showdefaults)
604 {
605 struct nfs_client *clp = nfss->nfs_client;
606
607 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
608 }
609 #else
nfs_show_nfsv4_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)610 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
611 int showdefaults)
612 {
613 }
614 #endif
615
nfs_show_nfs_version(struct seq_file * m,unsigned int version,unsigned int minorversion)616 static void nfs_show_nfs_version(struct seq_file *m,
617 unsigned int version,
618 unsigned int minorversion)
619 {
620 seq_printf(m, ",vers=%u", version);
621 if (version == 4)
622 seq_printf(m, ".%u", minorversion);
623 }
624
625 /*
626 * Describe the mount options in force on this server representation
627 */
nfs_show_mount_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)628 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
629 int showdefaults)
630 {
631 static const struct proc_nfs_info {
632 int flag;
633 const char *str;
634 const char *nostr;
635 } nfs_info[] = {
636 { NFS_MOUNT_SOFT, ",soft", ",hard" },
637 { NFS_MOUNT_POSIX, ",posix", "" },
638 { NFS_MOUNT_NOCTO, ",nocto", "" },
639 { NFS_MOUNT_NOAC, ",noac", "" },
640 { NFS_MOUNT_NONLM, ",nolock", "" },
641 { NFS_MOUNT_NOACL, ",noacl", "" },
642 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
643 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
644 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
645 { 0, NULL, NULL }
646 };
647 const struct proc_nfs_info *nfs_infop;
648 struct nfs_client *clp = nfss->nfs_client;
649 u32 version = clp->rpc_ops->version;
650 int local_flock, local_fcntl;
651
652 nfs_show_nfs_version(m, version, clp->cl_minorversion);
653 seq_printf(m, ",rsize=%u", nfss->rsize);
654 seq_printf(m, ",wsize=%u", nfss->wsize);
655 if (nfss->bsize != 0)
656 seq_printf(m, ",bsize=%u", nfss->bsize);
657 seq_printf(m, ",namlen=%u", nfss->namelen);
658 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
659 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
660 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
661 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
662 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
663 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
664 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
665 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
666 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
667 if (nfss->flags & nfs_infop->flag)
668 seq_puts(m, nfs_infop->str);
669 else
670 seq_puts(m, nfs_infop->nostr);
671 }
672 rcu_read_lock();
673 seq_printf(m, ",proto=%s",
674 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
675 rcu_read_unlock();
676 if (version == 4) {
677 if (nfss->port != NFS_PORT)
678 seq_printf(m, ",port=%u", nfss->port);
679 } else
680 if (nfss->port)
681 seq_printf(m, ",port=%u", nfss->port);
682
683 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
684 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
685 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
686
687 if (version != 4)
688 nfs_show_mountd_options(m, nfss, showdefaults);
689 else
690 nfs_show_nfsv4_options(m, nfss, showdefaults);
691
692 if (nfss->options & NFS_OPTION_FSCACHE)
693 seq_printf(m, ",fsc");
694
695 if (nfss->options & NFS_OPTION_MIGRATION)
696 seq_printf(m, ",migration");
697
698 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
699 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
700 seq_printf(m, ",lookupcache=none");
701 else
702 seq_printf(m, ",lookupcache=pos");
703 }
704
705 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
706 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
707
708 if (!local_flock && !local_fcntl)
709 seq_printf(m, ",local_lock=none");
710 else if (local_flock && local_fcntl)
711 seq_printf(m, ",local_lock=all");
712 else if (local_flock)
713 seq_printf(m, ",local_lock=flock");
714 else
715 seq_printf(m, ",local_lock=posix");
716 }
717
718 /*
719 * Describe the mount options on this VFS mountpoint
720 */
nfs_show_options(struct seq_file * m,struct dentry * root)721 int nfs_show_options(struct seq_file *m, struct dentry *root)
722 {
723 struct nfs_server *nfss = NFS_SB(root->d_sb);
724
725 nfs_show_mount_options(m, nfss, 0);
726
727 rcu_read_lock();
728 seq_printf(m, ",addr=%s",
729 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
730 RPC_DISPLAY_ADDR));
731 rcu_read_unlock();
732
733 return 0;
734 }
735 EXPORT_SYMBOL_GPL(nfs_show_options);
736
737 #if IS_ENABLED(CONFIG_NFS_V4)
738 #ifdef CONFIG_NFS_V4_1
show_sessions(struct seq_file * m,struct nfs_server * server)739 static void show_sessions(struct seq_file *m, struct nfs_server *server)
740 {
741 if (nfs4_has_session(server->nfs_client))
742 seq_printf(m, ",sessions");
743 }
744 #else
show_sessions(struct seq_file * m,struct nfs_server * server)745 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
746 #endif
747 #endif
748
749 #ifdef CONFIG_NFS_V4_1
show_pnfs(struct seq_file * m,struct nfs_server * server)750 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
751 {
752 seq_printf(m, ",pnfs=");
753 if (server->pnfs_curr_ld)
754 seq_printf(m, "%s", server->pnfs_curr_ld->name);
755 else
756 seq_printf(m, "not configured");
757 }
758
show_implementation_id(struct seq_file * m,struct nfs_server * nfss)759 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
760 {
761 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
762 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
763 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
764 "date='%llu,%u'",
765 impl_id->name, impl_id->domain,
766 impl_id->date.seconds, impl_id->date.nseconds);
767 }
768 }
769 #else
770 #if IS_ENABLED(CONFIG_NFS_V4)
show_pnfs(struct seq_file * m,struct nfs_server * server)771 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
772 {
773 }
774 #endif
show_implementation_id(struct seq_file * m,struct nfs_server * nfss)775 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
776 {
777 }
778 #endif
779
nfs_show_devname(struct seq_file * m,struct dentry * root)780 int nfs_show_devname(struct seq_file *m, struct dentry *root)
781 {
782 char *page = (char *) __get_free_page(GFP_KERNEL);
783 char *devname, *dummy;
784 int err = 0;
785 if (!page)
786 return -ENOMEM;
787 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
788 if (IS_ERR(devname))
789 err = PTR_ERR(devname);
790 else
791 seq_escape(m, devname, " \t\n\\");
792 free_page((unsigned long)page);
793 return err;
794 }
795 EXPORT_SYMBOL_GPL(nfs_show_devname);
796
nfs_show_path(struct seq_file * m,struct dentry * dentry)797 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
798 {
799 seq_puts(m, "/");
800 return 0;
801 }
802 EXPORT_SYMBOL_GPL(nfs_show_path);
803
804 /*
805 * Present statistical information for this VFS mountpoint
806 */
nfs_show_stats(struct seq_file * m,struct dentry * root)807 int nfs_show_stats(struct seq_file *m, struct dentry *root)
808 {
809 int i, cpu;
810 struct nfs_server *nfss = NFS_SB(root->d_sb);
811 struct rpc_auth *auth = nfss->client->cl_auth;
812 struct nfs_iostats totals = { };
813
814 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
815
816 /*
817 * Display all mount option settings
818 */
819 seq_printf(m, "\n\topts:\t");
820 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
821 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
822 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
823 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
824 nfs_show_mount_options(m, nfss, 1);
825
826 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
827
828 show_implementation_id(m, nfss);
829
830 seq_printf(m, "\n\tcaps:\t");
831 seq_printf(m, "caps=0x%x", nfss->caps);
832 seq_printf(m, ",wtmult=%u", nfss->wtmult);
833 seq_printf(m, ",dtsize=%u", nfss->dtsize);
834 seq_printf(m, ",bsize=%u", nfss->bsize);
835 seq_printf(m, ",namlen=%u", nfss->namelen);
836
837 #if IS_ENABLED(CONFIG_NFS_V4)
838 if (nfss->nfs_client->rpc_ops->version == 4) {
839 seq_printf(m, "\n\tnfsv4:\t");
840 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
841 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
842 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
843 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
844 show_sessions(m, nfss);
845 show_pnfs(m, nfss);
846 }
847 #endif
848
849 /*
850 * Display security flavor in effect for this mount
851 */
852 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
853 if (auth->au_flavor)
854 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
855
856 /*
857 * Display superblock I/O counters
858 */
859 for_each_possible_cpu(cpu) {
860 struct nfs_iostats *stats;
861
862 preempt_disable();
863 stats = per_cpu_ptr(nfss->io_stats, cpu);
864
865 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
866 totals.events[i] += stats->events[i];
867 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
868 totals.bytes[i] += stats->bytes[i];
869 #ifdef CONFIG_NFS_FSCACHE
870 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
871 totals.fscache[i] += stats->fscache[i];
872 #endif
873
874 preempt_enable();
875 }
876
877 seq_printf(m, "\n\tevents:\t");
878 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
879 seq_printf(m, "%lu ", totals.events[i]);
880 seq_printf(m, "\n\tbytes:\t");
881 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
882 seq_printf(m, "%Lu ", totals.bytes[i]);
883 #ifdef CONFIG_NFS_FSCACHE
884 if (nfss->options & NFS_OPTION_FSCACHE) {
885 seq_printf(m, "\n\tfsc:\t");
886 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
887 seq_printf(m, "%Lu ", totals.bytes[i]);
888 }
889 #endif
890 seq_printf(m, "\n");
891
892 rpc_print_iostats(m, nfss->client);
893
894 return 0;
895 }
896 EXPORT_SYMBOL_GPL(nfs_show_stats);
897
898 /*
899 * Begin unmount by attempting to remove all automounted mountpoints we added
900 * in response to xdev traversals and referrals
901 */
nfs_umount_begin(struct super_block * sb)902 void nfs_umount_begin(struct super_block *sb)
903 {
904 struct nfs_server *server;
905 struct rpc_clnt *rpc;
906
907 server = NFS_SB(sb);
908 /* -EIO all pending I/O */
909 rpc = server->client_acl;
910 if (!IS_ERR(rpc))
911 rpc_killall_tasks(rpc);
912 rpc = server->client;
913 if (!IS_ERR(rpc))
914 rpc_killall_tasks(rpc);
915 }
916 EXPORT_SYMBOL_GPL(nfs_umount_begin);
917
nfs_alloc_parsed_mount_data(void)918 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
919 {
920 struct nfs_parsed_mount_data *data;
921
922 data = kzalloc(sizeof(*data), GFP_KERNEL);
923 if (data) {
924 data->acregmin = NFS_DEF_ACREGMIN;
925 data->acregmax = NFS_DEF_ACREGMAX;
926 data->acdirmin = NFS_DEF_ACDIRMIN;
927 data->acdirmax = NFS_DEF_ACDIRMAX;
928 data->mount_server.port = NFS_UNSPEC_PORT;
929 data->nfs_server.port = NFS_UNSPEC_PORT;
930 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
931 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
932 data->minorversion = 0;
933 data->need_mount = true;
934 data->net = current->nsproxy->net_ns;
935 security_init_mnt_opts(&data->lsm_opts);
936 }
937 return data;
938 }
939
nfs_free_parsed_mount_data(struct nfs_parsed_mount_data * data)940 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
941 {
942 if (data) {
943 kfree(data->client_address);
944 kfree(data->mount_server.hostname);
945 kfree(data->nfs_server.export_path);
946 kfree(data->nfs_server.hostname);
947 kfree(data->fscache_uniq);
948 security_free_mnt_opts(&data->lsm_opts);
949 kfree(data);
950 }
951 }
952
953 /*
954 * Sanity-check a server address provided by the mount command.
955 *
956 * Address family must be initialized, and address must not be
957 * the ANY address for that family.
958 */
nfs_verify_server_address(struct sockaddr * addr)959 static int nfs_verify_server_address(struct sockaddr *addr)
960 {
961 switch (addr->sa_family) {
962 case AF_INET: {
963 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
964 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
965 }
966 case AF_INET6: {
967 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
968 return !ipv6_addr_any(sa);
969 }
970 }
971
972 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
973 return 0;
974 }
975
976 /*
977 * Select between a default port value and a user-specified port value.
978 * If a zero value is set, then autobind will be used.
979 */
nfs_set_port(struct sockaddr * sap,int * port,const unsigned short default_port)980 static void nfs_set_port(struct sockaddr *sap, int *port,
981 const unsigned short default_port)
982 {
983 if (*port == NFS_UNSPEC_PORT)
984 *port = default_port;
985
986 rpc_set_port(sap, *port);
987 }
988
989 /*
990 * Sanity check the NFS transport protocol.
991 *
992 */
nfs_validate_transport_protocol(struct nfs_parsed_mount_data * mnt)993 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
994 {
995 switch (mnt->nfs_server.protocol) {
996 case XPRT_TRANSPORT_UDP:
997 case XPRT_TRANSPORT_TCP:
998 case XPRT_TRANSPORT_RDMA:
999 break;
1000 default:
1001 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1002 }
1003 }
1004
1005 /*
1006 * For text based NFSv2/v3 mounts, the mount protocol transport default
1007 * settings should depend upon the specified NFS transport.
1008 */
nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data * mnt)1009 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1010 {
1011 nfs_validate_transport_protocol(mnt);
1012
1013 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1014 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1015 return;
1016 switch (mnt->nfs_server.protocol) {
1017 case XPRT_TRANSPORT_UDP:
1018 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1019 break;
1020 case XPRT_TRANSPORT_TCP:
1021 case XPRT_TRANSPORT_RDMA:
1022 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1023 }
1024 }
1025
1026 /*
1027 * Add 'flavor' to 'auth_info' if not already present.
1028 * Returns true if 'flavor' ends up in the list, false otherwise
1029 */
nfs_auth_info_add(struct nfs_auth_info * auth_info,rpc_authflavor_t flavor)1030 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1031 rpc_authflavor_t flavor)
1032 {
1033 unsigned int i;
1034 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1035
1036 /* make sure this flavor isn't already in the list */
1037 for (i = 0; i < auth_info->flavor_len; i++) {
1038 if (flavor == auth_info->flavors[i])
1039 return true;
1040 }
1041
1042 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1043 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1044 return false;
1045 }
1046
1047 auth_info->flavors[auth_info->flavor_len++] = flavor;
1048 return true;
1049 }
1050
1051 /*
1052 * Return true if 'match' is in auth_info or auth_info is empty.
1053 * Return false otherwise.
1054 */
nfs_auth_info_match(const struct nfs_auth_info * auth_info,rpc_authflavor_t match)1055 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1056 rpc_authflavor_t match)
1057 {
1058 int i;
1059
1060 if (!auth_info->flavor_len)
1061 return true;
1062
1063 for (i = 0; i < auth_info->flavor_len; i++) {
1064 if (auth_info->flavors[i] == match)
1065 return true;
1066 }
1067 return false;
1068 }
1069 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1070
1071 /*
1072 * Parse the value of the 'sec=' option.
1073 */
nfs_parse_security_flavors(char * value,struct nfs_parsed_mount_data * mnt)1074 static int nfs_parse_security_flavors(char *value,
1075 struct nfs_parsed_mount_data *mnt)
1076 {
1077 substring_t args[MAX_OPT_ARGS];
1078 rpc_authflavor_t pseudoflavor;
1079 char *p;
1080
1081 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1082
1083 while ((p = strsep(&value, ":")) != NULL) {
1084 switch (match_token(p, nfs_secflavor_tokens, args)) {
1085 case Opt_sec_none:
1086 pseudoflavor = RPC_AUTH_NULL;
1087 break;
1088 case Opt_sec_sys:
1089 pseudoflavor = RPC_AUTH_UNIX;
1090 break;
1091 case Opt_sec_krb5:
1092 pseudoflavor = RPC_AUTH_GSS_KRB5;
1093 break;
1094 case Opt_sec_krb5i:
1095 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1096 break;
1097 case Opt_sec_krb5p:
1098 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1099 break;
1100 case Opt_sec_lkey:
1101 pseudoflavor = RPC_AUTH_GSS_LKEY;
1102 break;
1103 case Opt_sec_lkeyi:
1104 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1105 break;
1106 case Opt_sec_lkeyp:
1107 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1108 break;
1109 case Opt_sec_spkm:
1110 pseudoflavor = RPC_AUTH_GSS_SPKM;
1111 break;
1112 case Opt_sec_spkmi:
1113 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1114 break;
1115 case Opt_sec_spkmp:
1116 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1117 break;
1118 default:
1119 dfprintk(MOUNT,
1120 "NFS: sec= option '%s' not recognized\n", p);
1121 return 0;
1122 }
1123
1124 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1125 return 0;
1126 }
1127
1128 return 1;
1129 }
1130
nfs_parse_version_string(char * string,struct nfs_parsed_mount_data * mnt,substring_t * args)1131 static int nfs_parse_version_string(char *string,
1132 struct nfs_parsed_mount_data *mnt,
1133 substring_t *args)
1134 {
1135 mnt->flags &= ~NFS_MOUNT_VER3;
1136 switch (match_token(string, nfs_vers_tokens, args)) {
1137 case Opt_vers_2:
1138 mnt->version = 2;
1139 break;
1140 case Opt_vers_3:
1141 mnt->flags |= NFS_MOUNT_VER3;
1142 mnt->version = 3;
1143 break;
1144 case Opt_vers_4:
1145 /* Backward compatibility option. In future,
1146 * the mount program should always supply
1147 * a NFSv4 minor version number.
1148 */
1149 mnt->version = 4;
1150 break;
1151 case Opt_vers_4_0:
1152 mnt->version = 4;
1153 mnt->minorversion = 0;
1154 break;
1155 case Opt_vers_4_1:
1156 mnt->version = 4;
1157 mnt->minorversion = 1;
1158 break;
1159 case Opt_vers_4_2:
1160 mnt->version = 4;
1161 mnt->minorversion = 2;
1162 break;
1163 default:
1164 return 0;
1165 }
1166 return 1;
1167 }
1168
nfs_get_option_str(substring_t args[],char ** option)1169 static int nfs_get_option_str(substring_t args[], char **option)
1170 {
1171 kfree(*option);
1172 *option = match_strdup(args);
1173 return !*option;
1174 }
1175
nfs_get_option_ul(substring_t args[],unsigned long * option)1176 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1177 {
1178 int rc;
1179 char *string;
1180
1181 string = match_strdup(args);
1182 if (string == NULL)
1183 return -ENOMEM;
1184 rc = kstrtoul(string, 10, option);
1185 kfree(string);
1186
1187 return rc;
1188 }
1189
1190 /*
1191 * Error-check and convert a string of mount options from user space into
1192 * a data structure. The whole mount string is processed; bad options are
1193 * skipped as they are encountered. If there were no errors, return 1;
1194 * otherwise return 0 (zero).
1195 */
nfs_parse_mount_options(char * raw,struct nfs_parsed_mount_data * mnt)1196 static int nfs_parse_mount_options(char *raw,
1197 struct nfs_parsed_mount_data *mnt)
1198 {
1199 char *p, *string, *secdata;
1200 int rc, sloppy = 0, invalid_option = 0;
1201 unsigned short protofamily = AF_UNSPEC;
1202 unsigned short mountfamily = AF_UNSPEC;
1203
1204 if (!raw) {
1205 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1206 return 1;
1207 }
1208 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1209
1210 secdata = alloc_secdata();
1211 if (!secdata)
1212 goto out_nomem;
1213
1214 rc = security_sb_copy_data(raw, secdata);
1215 if (rc)
1216 goto out_security_failure;
1217
1218 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1219 if (rc)
1220 goto out_security_failure;
1221
1222 free_secdata(secdata);
1223
1224 while ((p = strsep(&raw, ",")) != NULL) {
1225 substring_t args[MAX_OPT_ARGS];
1226 unsigned long option;
1227 int token;
1228
1229 if (!*p)
1230 continue;
1231
1232 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1233
1234 token = match_token(p, nfs_mount_option_tokens, args);
1235 switch (token) {
1236
1237 /*
1238 * boolean options: foo/nofoo
1239 */
1240 case Opt_soft:
1241 mnt->flags |= NFS_MOUNT_SOFT;
1242 break;
1243 case Opt_hard:
1244 mnt->flags &= ~NFS_MOUNT_SOFT;
1245 break;
1246 case Opt_posix:
1247 mnt->flags |= NFS_MOUNT_POSIX;
1248 break;
1249 case Opt_noposix:
1250 mnt->flags &= ~NFS_MOUNT_POSIX;
1251 break;
1252 case Opt_cto:
1253 mnt->flags &= ~NFS_MOUNT_NOCTO;
1254 break;
1255 case Opt_nocto:
1256 mnt->flags |= NFS_MOUNT_NOCTO;
1257 break;
1258 case Opt_ac:
1259 mnt->flags &= ~NFS_MOUNT_NOAC;
1260 break;
1261 case Opt_noac:
1262 mnt->flags |= NFS_MOUNT_NOAC;
1263 break;
1264 case Opt_lock:
1265 mnt->flags &= ~NFS_MOUNT_NONLM;
1266 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1267 NFS_MOUNT_LOCAL_FCNTL);
1268 break;
1269 case Opt_nolock:
1270 mnt->flags |= NFS_MOUNT_NONLM;
1271 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1272 NFS_MOUNT_LOCAL_FCNTL);
1273 break;
1274 case Opt_udp:
1275 mnt->flags &= ~NFS_MOUNT_TCP;
1276 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1277 break;
1278 case Opt_tcp:
1279 mnt->flags |= NFS_MOUNT_TCP;
1280 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1281 break;
1282 case Opt_rdma:
1283 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1284 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1285 xprt_load_transport(p);
1286 break;
1287 case Opt_acl:
1288 mnt->flags &= ~NFS_MOUNT_NOACL;
1289 break;
1290 case Opt_noacl:
1291 mnt->flags |= NFS_MOUNT_NOACL;
1292 break;
1293 case Opt_rdirplus:
1294 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1295 break;
1296 case Opt_nordirplus:
1297 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1298 break;
1299 case Opt_sharecache:
1300 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1301 break;
1302 case Opt_nosharecache:
1303 mnt->flags |= NFS_MOUNT_UNSHARED;
1304 break;
1305 case Opt_resvport:
1306 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1307 break;
1308 case Opt_noresvport:
1309 mnt->flags |= NFS_MOUNT_NORESVPORT;
1310 break;
1311 case Opt_fscache:
1312 mnt->options |= NFS_OPTION_FSCACHE;
1313 kfree(mnt->fscache_uniq);
1314 mnt->fscache_uniq = NULL;
1315 break;
1316 case Opt_nofscache:
1317 mnt->options &= ~NFS_OPTION_FSCACHE;
1318 kfree(mnt->fscache_uniq);
1319 mnt->fscache_uniq = NULL;
1320 break;
1321 case Opt_migration:
1322 mnt->options |= NFS_OPTION_MIGRATION;
1323 break;
1324 case Opt_nomigration:
1325 mnt->options &= ~NFS_OPTION_MIGRATION;
1326 break;
1327
1328 /*
1329 * options that take numeric values
1330 */
1331 case Opt_port:
1332 if (nfs_get_option_ul(args, &option) ||
1333 option > USHRT_MAX)
1334 goto out_invalid_value;
1335 mnt->nfs_server.port = option;
1336 break;
1337 case Opt_rsize:
1338 if (nfs_get_option_ul(args, &option))
1339 goto out_invalid_value;
1340 mnt->rsize = option;
1341 break;
1342 case Opt_wsize:
1343 if (nfs_get_option_ul(args, &option))
1344 goto out_invalid_value;
1345 mnt->wsize = option;
1346 break;
1347 case Opt_bsize:
1348 if (nfs_get_option_ul(args, &option))
1349 goto out_invalid_value;
1350 mnt->bsize = option;
1351 break;
1352 case Opt_timeo:
1353 if (nfs_get_option_ul(args, &option) || option == 0)
1354 goto out_invalid_value;
1355 mnt->timeo = option;
1356 break;
1357 case Opt_retrans:
1358 if (nfs_get_option_ul(args, &option) || option == 0)
1359 goto out_invalid_value;
1360 mnt->retrans = option;
1361 break;
1362 case Opt_acregmin:
1363 if (nfs_get_option_ul(args, &option))
1364 goto out_invalid_value;
1365 mnt->acregmin = option;
1366 break;
1367 case Opt_acregmax:
1368 if (nfs_get_option_ul(args, &option))
1369 goto out_invalid_value;
1370 mnt->acregmax = option;
1371 break;
1372 case Opt_acdirmin:
1373 if (nfs_get_option_ul(args, &option))
1374 goto out_invalid_value;
1375 mnt->acdirmin = option;
1376 break;
1377 case Opt_acdirmax:
1378 if (nfs_get_option_ul(args, &option))
1379 goto out_invalid_value;
1380 mnt->acdirmax = option;
1381 break;
1382 case Opt_actimeo:
1383 if (nfs_get_option_ul(args, &option))
1384 goto out_invalid_value;
1385 mnt->acregmin = mnt->acregmax =
1386 mnt->acdirmin = mnt->acdirmax = option;
1387 break;
1388 case Opt_namelen:
1389 if (nfs_get_option_ul(args, &option))
1390 goto out_invalid_value;
1391 mnt->namlen = option;
1392 break;
1393 case Opt_mountport:
1394 if (nfs_get_option_ul(args, &option) ||
1395 option > USHRT_MAX)
1396 goto out_invalid_value;
1397 mnt->mount_server.port = option;
1398 break;
1399 case Opt_mountvers:
1400 if (nfs_get_option_ul(args, &option) ||
1401 option < NFS_MNT_VERSION ||
1402 option > NFS_MNT3_VERSION)
1403 goto out_invalid_value;
1404 mnt->mount_server.version = option;
1405 break;
1406 case Opt_minorversion:
1407 if (nfs_get_option_ul(args, &option))
1408 goto out_invalid_value;
1409 if (option > NFS4_MAX_MINOR_VERSION)
1410 goto out_invalid_value;
1411 mnt->minorversion = option;
1412 break;
1413
1414 /*
1415 * options that take text values
1416 */
1417 case Opt_nfsvers:
1418 string = match_strdup(args);
1419 if (string == NULL)
1420 goto out_nomem;
1421 rc = nfs_parse_version_string(string, mnt, args);
1422 kfree(string);
1423 if (!rc)
1424 goto out_invalid_value;
1425 break;
1426 case Opt_sec:
1427 string = match_strdup(args);
1428 if (string == NULL)
1429 goto out_nomem;
1430 rc = nfs_parse_security_flavors(string, mnt);
1431 kfree(string);
1432 if (!rc) {
1433 dfprintk(MOUNT, "NFS: unrecognized "
1434 "security flavor\n");
1435 return 0;
1436 }
1437 break;
1438 case Opt_proto:
1439 string = match_strdup(args);
1440 if (string == NULL)
1441 goto out_nomem;
1442 token = match_token(string,
1443 nfs_xprt_protocol_tokens, args);
1444
1445 protofamily = AF_INET;
1446 switch (token) {
1447 case Opt_xprt_udp6:
1448 protofamily = AF_INET6;
1449 case Opt_xprt_udp:
1450 mnt->flags &= ~NFS_MOUNT_TCP;
1451 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1452 break;
1453 case Opt_xprt_tcp6:
1454 protofamily = AF_INET6;
1455 case Opt_xprt_tcp:
1456 mnt->flags |= NFS_MOUNT_TCP;
1457 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1458 break;
1459 case Opt_xprt_rdma:
1460 /* vector side protocols to TCP */
1461 mnt->flags |= NFS_MOUNT_TCP;
1462 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1463 xprt_load_transport(string);
1464 break;
1465 default:
1466 dfprintk(MOUNT, "NFS: unrecognized "
1467 "transport protocol\n");
1468 kfree(string);
1469 return 0;
1470 }
1471 kfree(string);
1472 break;
1473 case Opt_mountproto:
1474 string = match_strdup(args);
1475 if (string == NULL)
1476 goto out_nomem;
1477 token = match_token(string,
1478 nfs_xprt_protocol_tokens, args);
1479 kfree(string);
1480
1481 mountfamily = AF_INET;
1482 switch (token) {
1483 case Opt_xprt_udp6:
1484 mountfamily = AF_INET6;
1485 case Opt_xprt_udp:
1486 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1487 break;
1488 case Opt_xprt_tcp6:
1489 mountfamily = AF_INET6;
1490 case Opt_xprt_tcp:
1491 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1492 break;
1493 case Opt_xprt_rdma: /* not used for side protocols */
1494 default:
1495 dfprintk(MOUNT, "NFS: unrecognized "
1496 "transport protocol\n");
1497 return 0;
1498 }
1499 break;
1500 case Opt_addr:
1501 string = match_strdup(args);
1502 if (string == NULL)
1503 goto out_nomem;
1504 mnt->nfs_server.addrlen =
1505 rpc_pton(mnt->net, string, strlen(string),
1506 (struct sockaddr *)
1507 &mnt->nfs_server.address,
1508 sizeof(mnt->nfs_server.address));
1509 kfree(string);
1510 if (mnt->nfs_server.addrlen == 0)
1511 goto out_invalid_address;
1512 break;
1513 case Opt_clientaddr:
1514 if (nfs_get_option_str(args, &mnt->client_address))
1515 goto out_nomem;
1516 break;
1517 case Opt_mounthost:
1518 if (nfs_get_option_str(args,
1519 &mnt->mount_server.hostname))
1520 goto out_nomem;
1521 break;
1522 case Opt_mountaddr:
1523 string = match_strdup(args);
1524 if (string == NULL)
1525 goto out_nomem;
1526 mnt->mount_server.addrlen =
1527 rpc_pton(mnt->net, string, strlen(string),
1528 (struct sockaddr *)
1529 &mnt->mount_server.address,
1530 sizeof(mnt->mount_server.address));
1531 kfree(string);
1532 if (mnt->mount_server.addrlen == 0)
1533 goto out_invalid_address;
1534 break;
1535 case Opt_lookupcache:
1536 string = match_strdup(args);
1537 if (string == NULL)
1538 goto out_nomem;
1539 token = match_token(string,
1540 nfs_lookupcache_tokens, args);
1541 kfree(string);
1542 switch (token) {
1543 case Opt_lookupcache_all:
1544 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1545 break;
1546 case Opt_lookupcache_positive:
1547 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1548 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1549 break;
1550 case Opt_lookupcache_none:
1551 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1552 break;
1553 default:
1554 dfprintk(MOUNT, "NFS: invalid "
1555 "lookupcache argument\n");
1556 return 0;
1557 };
1558 break;
1559 case Opt_fscache_uniq:
1560 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1561 goto out_nomem;
1562 mnt->options |= NFS_OPTION_FSCACHE;
1563 break;
1564 case Opt_local_lock:
1565 string = match_strdup(args);
1566 if (string == NULL)
1567 goto out_nomem;
1568 token = match_token(string, nfs_local_lock_tokens,
1569 args);
1570 kfree(string);
1571 switch (token) {
1572 case Opt_local_lock_all:
1573 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1574 NFS_MOUNT_LOCAL_FCNTL);
1575 break;
1576 case Opt_local_lock_flock:
1577 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1578 break;
1579 case Opt_local_lock_posix:
1580 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1581 break;
1582 case Opt_local_lock_none:
1583 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1584 NFS_MOUNT_LOCAL_FCNTL);
1585 break;
1586 default:
1587 dfprintk(MOUNT, "NFS: invalid "
1588 "local_lock argument\n");
1589 return 0;
1590 };
1591 break;
1592
1593 /*
1594 * Special options
1595 */
1596 case Opt_sloppy:
1597 sloppy = 1;
1598 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1599 break;
1600 case Opt_userspace:
1601 case Opt_deprecated:
1602 dfprintk(MOUNT, "NFS: ignoring mount option "
1603 "'%s'\n", p);
1604 break;
1605
1606 default:
1607 invalid_option = 1;
1608 dfprintk(MOUNT, "NFS: unrecognized mount option "
1609 "'%s'\n", p);
1610 }
1611 }
1612
1613 if (!sloppy && invalid_option)
1614 return 0;
1615
1616 if (mnt->minorversion && mnt->version != 4)
1617 goto out_minorversion_mismatch;
1618
1619 if (mnt->options & NFS_OPTION_MIGRATION &&
1620 (mnt->version != 4 || mnt->minorversion != 0))
1621 goto out_migration_misuse;
1622
1623 /*
1624 * verify that any proto=/mountproto= options match the address
1625 * families in the addr=/mountaddr= options.
1626 */
1627 if (protofamily != AF_UNSPEC &&
1628 protofamily != mnt->nfs_server.address.ss_family)
1629 goto out_proto_mismatch;
1630
1631 if (mountfamily != AF_UNSPEC) {
1632 if (mnt->mount_server.addrlen) {
1633 if (mountfamily != mnt->mount_server.address.ss_family)
1634 goto out_mountproto_mismatch;
1635 } else {
1636 if (mountfamily != mnt->nfs_server.address.ss_family)
1637 goto out_mountproto_mismatch;
1638 }
1639 }
1640
1641 return 1;
1642
1643 out_mountproto_mismatch:
1644 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1645 "option\n");
1646 return 0;
1647 out_proto_mismatch:
1648 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1649 return 0;
1650 out_invalid_address:
1651 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1652 return 0;
1653 out_invalid_value:
1654 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1655 return 0;
1656 out_minorversion_mismatch:
1657 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1658 "minorversion=%u\n", mnt->version, mnt->minorversion);
1659 return 0;
1660 out_migration_misuse:
1661 printk(KERN_INFO
1662 "NFS: 'migration' not supported for this NFS version\n");
1663 return 0;
1664 out_nomem:
1665 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1666 return 0;
1667 out_security_failure:
1668 free_secdata(secdata);
1669 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1670 return 0;
1671 }
1672
1673 /*
1674 * Ensure that a specified authtype in args->auth_info is supported by
1675 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1676 * -EACCES if not.
1677 */
nfs_verify_authflavors(struct nfs_parsed_mount_data * args,rpc_authflavor_t * server_authlist,unsigned int count)1678 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1679 rpc_authflavor_t *server_authlist, unsigned int count)
1680 {
1681 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1682 unsigned int i;
1683
1684 /*
1685 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1686 * must be in the list returned by the server.
1687 *
1688 * AUTH_NULL has a special meaning when it's in the server list - it
1689 * means that the server will ignore the rpc creds, so any flavor
1690 * can be used.
1691 */
1692 for (i = 0; i < count; i++) {
1693 flavor = server_authlist[i];
1694
1695 if (nfs_auth_info_match(&args->auth_info, flavor) ||
1696 flavor == RPC_AUTH_NULL)
1697 goto out;
1698 }
1699
1700 dfprintk(MOUNT,
1701 "NFS: specified auth flavors not supported by server\n");
1702 return -EACCES;
1703
1704 out:
1705 args->selected_flavor = flavor;
1706 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1707 return 0;
1708 }
1709
1710 /*
1711 * Use the remote server's MOUNT service to request the NFS file handle
1712 * corresponding to the provided path.
1713 */
nfs_request_mount(struct nfs_parsed_mount_data * args,struct nfs_fh * root_fh,rpc_authflavor_t * server_authlist,unsigned int * server_authlist_len)1714 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1715 struct nfs_fh *root_fh,
1716 rpc_authflavor_t *server_authlist,
1717 unsigned int *server_authlist_len)
1718 {
1719 struct nfs_mount_request request = {
1720 .sap = (struct sockaddr *)
1721 &args->mount_server.address,
1722 .dirpath = args->nfs_server.export_path,
1723 .protocol = args->mount_server.protocol,
1724 .fh = root_fh,
1725 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1726 .auth_flav_len = server_authlist_len,
1727 .auth_flavs = server_authlist,
1728 .net = args->net,
1729 };
1730 int status;
1731
1732 if (args->mount_server.version == 0) {
1733 switch (args->version) {
1734 default:
1735 args->mount_server.version = NFS_MNT3_VERSION;
1736 break;
1737 case 2:
1738 args->mount_server.version = NFS_MNT_VERSION;
1739 }
1740 }
1741 request.version = args->mount_server.version;
1742
1743 if (args->mount_server.hostname)
1744 request.hostname = args->mount_server.hostname;
1745 else
1746 request.hostname = args->nfs_server.hostname;
1747
1748 /*
1749 * Construct the mount server's address.
1750 */
1751 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1752 memcpy(request.sap, &args->nfs_server.address,
1753 args->nfs_server.addrlen);
1754 args->mount_server.addrlen = args->nfs_server.addrlen;
1755 }
1756 request.salen = args->mount_server.addrlen;
1757 nfs_set_port(request.sap, &args->mount_server.port, 0);
1758
1759 /*
1760 * Now ask the mount server to map our export path
1761 * to a file handle.
1762 */
1763 status = nfs_mount(&request);
1764 if (status != 0) {
1765 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1766 request.hostname, status);
1767 return status;
1768 }
1769
1770 return 0;
1771 }
1772
nfs_try_mount_request(struct nfs_mount_info * mount_info,struct nfs_subversion * nfs_mod)1773 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1774 struct nfs_subversion *nfs_mod)
1775 {
1776 int status;
1777 unsigned int i;
1778 bool tried_auth_unix = false;
1779 bool auth_null_in_list = false;
1780 struct nfs_server *server = ERR_PTR(-EACCES);
1781 struct nfs_parsed_mount_data *args = mount_info->parsed;
1782 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1783 unsigned int authlist_len = ARRAY_SIZE(authlist);
1784
1785 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1786 &authlist_len);
1787 if (status)
1788 return ERR_PTR(status);
1789
1790 /*
1791 * Was a sec= authflavor specified in the options? First, verify
1792 * whether the server supports it, and then just try to use it if so.
1793 */
1794 if (args->auth_info.flavor_len > 0) {
1795 status = nfs_verify_authflavors(args, authlist, authlist_len);
1796 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1797 args->selected_flavor);
1798 if (status)
1799 return ERR_PTR(status);
1800 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1801 }
1802
1803 /*
1804 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1805 * SHOULD prefer the flavor listed first. However, some servers list
1806 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1807 */
1808 for (i = 0; i < authlist_len; ++i) {
1809 rpc_authflavor_t flavor;
1810 struct rpcsec_gss_info info;
1811
1812 flavor = authlist[i];
1813 switch (flavor) {
1814 case RPC_AUTH_UNIX:
1815 tried_auth_unix = true;
1816 break;
1817 case RPC_AUTH_NULL:
1818 auth_null_in_list = true;
1819 continue;
1820 default:
1821 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1822 continue;
1823 /* Fallthrough */
1824 }
1825 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1826 args->selected_flavor = flavor;
1827 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1828 if (!IS_ERR(server))
1829 return server;
1830 }
1831
1832 /*
1833 * Nothing we tried so far worked. At this point, give up if we've
1834 * already tried AUTH_UNIX or if the server's list doesn't contain
1835 * AUTH_NULL
1836 */
1837 if (tried_auth_unix || !auth_null_in_list)
1838 return server;
1839
1840 /* Last chance! Try AUTH_UNIX */
1841 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1842 args->selected_flavor = RPC_AUTH_UNIX;
1843 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1844 }
1845
nfs_try_mount(int flags,const char * dev_name,struct nfs_mount_info * mount_info,struct nfs_subversion * nfs_mod)1846 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1847 struct nfs_mount_info *mount_info,
1848 struct nfs_subversion *nfs_mod)
1849 {
1850 struct nfs_server *server;
1851
1852 if (mount_info->parsed->need_mount)
1853 server = nfs_try_mount_request(mount_info, nfs_mod);
1854 else
1855 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1856
1857 if (IS_ERR(server))
1858 return ERR_CAST(server);
1859
1860 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1861 }
1862 EXPORT_SYMBOL_GPL(nfs_try_mount);
1863
1864 /*
1865 * Split "dev_name" into "hostname:export_path".
1866 *
1867 * The leftmost colon demarks the split between the server's hostname
1868 * and the export path. If the hostname starts with a left square
1869 * bracket, then it may contain colons.
1870 *
1871 * Note: caller frees hostname and export path, even on error.
1872 */
nfs_parse_devname(const char * dev_name,char ** hostname,size_t maxnamlen,char ** export_path,size_t maxpathlen)1873 static int nfs_parse_devname(const char *dev_name,
1874 char **hostname, size_t maxnamlen,
1875 char **export_path, size_t maxpathlen)
1876 {
1877 size_t len;
1878 char *end;
1879
1880 if (unlikely(!dev_name || !*dev_name)) {
1881 dfprintk(MOUNT, "NFS: device name not specified\n");
1882 return -EINVAL;
1883 }
1884
1885 /* Is the host name protected with square brakcets? */
1886 if (*dev_name == '[') {
1887 end = strchr(++dev_name, ']');
1888 if (end == NULL || end[1] != ':')
1889 goto out_bad_devname;
1890
1891 len = end - dev_name;
1892 end++;
1893 } else {
1894 char *comma;
1895
1896 end = strchr(dev_name, ':');
1897 if (end == NULL)
1898 goto out_bad_devname;
1899 len = end - dev_name;
1900
1901 /* kill possible hostname list: not supported */
1902 comma = strchr(dev_name, ',');
1903 if (comma != NULL && comma < end)
1904 len = comma - dev_name;
1905 }
1906
1907 if (len > maxnamlen)
1908 goto out_hostname;
1909
1910 /* N.B. caller will free nfs_server.hostname in all cases */
1911 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1912 if (*hostname == NULL)
1913 goto out_nomem;
1914 len = strlen(++end);
1915 if (len > maxpathlen)
1916 goto out_path;
1917 *export_path = kstrndup(end, len, GFP_KERNEL);
1918 if (!*export_path)
1919 goto out_nomem;
1920
1921 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1922 return 0;
1923
1924 out_bad_devname:
1925 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1926 return -EINVAL;
1927
1928 out_nomem:
1929 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1930 return -ENOMEM;
1931
1932 out_hostname:
1933 dfprintk(MOUNT, "NFS: server hostname too long\n");
1934 return -ENAMETOOLONG;
1935
1936 out_path:
1937 dfprintk(MOUNT, "NFS: export pathname too long\n");
1938 return -ENAMETOOLONG;
1939 }
1940
1941 /*
1942 * Validate the NFS2/NFS3 mount data
1943 * - fills in the mount root filehandle
1944 *
1945 * For option strings, user space handles the following behaviors:
1946 *
1947 * + DNS: mapping server host name to IP address ("addr=" option)
1948 *
1949 * + failure mode: how to behave if a mount request can't be handled
1950 * immediately ("fg/bg" option)
1951 *
1952 * + retry: how often to retry a mount request ("retry=" option)
1953 *
1954 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1955 * mountproto=tcp after mountproto=udp, and so on
1956 */
nfs23_validate_mount_data(void * options,struct nfs_parsed_mount_data * args,struct nfs_fh * mntfh,const char * dev_name)1957 static int nfs23_validate_mount_data(void *options,
1958 struct nfs_parsed_mount_data *args,
1959 struct nfs_fh *mntfh,
1960 const char *dev_name)
1961 {
1962 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1963 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1964 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1965
1966 if (data == NULL)
1967 goto out_no_data;
1968
1969 args->version = NFS_DEFAULT_VERSION;
1970 switch (data->version) {
1971 case 1:
1972 data->namlen = 0;
1973 case 2:
1974 data->bsize = 0;
1975 case 3:
1976 if (data->flags & NFS_MOUNT_VER3)
1977 goto out_no_v3;
1978 data->root.size = NFS2_FHSIZE;
1979 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1980 /* Turn off security negotiation */
1981 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1982 case 4:
1983 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1984 goto out_no_sec;
1985 case 5:
1986 memset(data->context, 0, sizeof(data->context));
1987 case 6:
1988 if (data->flags & NFS_MOUNT_VER3) {
1989 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1990 goto out_invalid_fh;
1991 mntfh->size = data->root.size;
1992 args->version = 3;
1993 } else {
1994 mntfh->size = NFS2_FHSIZE;
1995 args->version = 2;
1996 }
1997
1998
1999 memcpy(mntfh->data, data->root.data, mntfh->size);
2000 if (mntfh->size < sizeof(mntfh->data))
2001 memset(mntfh->data + mntfh->size, 0,
2002 sizeof(mntfh->data) - mntfh->size);
2003
2004 /*
2005 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2006 * can deal with.
2007 */
2008 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2009 args->flags |= extra_flags;
2010 args->rsize = data->rsize;
2011 args->wsize = data->wsize;
2012 args->timeo = data->timeo;
2013 args->retrans = data->retrans;
2014 args->acregmin = data->acregmin;
2015 args->acregmax = data->acregmax;
2016 args->acdirmin = data->acdirmin;
2017 args->acdirmax = data->acdirmax;
2018 args->need_mount = false;
2019
2020 memcpy(sap, &data->addr, sizeof(data->addr));
2021 args->nfs_server.addrlen = sizeof(data->addr);
2022 args->nfs_server.port = ntohs(data->addr.sin_port);
2023 if (sap->sa_family != AF_INET ||
2024 !nfs_verify_server_address(sap))
2025 goto out_no_address;
2026
2027 if (!(data->flags & NFS_MOUNT_TCP))
2028 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2029 /* N.B. caller will free nfs_server.hostname in all cases */
2030 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2031 args->namlen = data->namlen;
2032 args->bsize = data->bsize;
2033
2034 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2035 args->selected_flavor = data->pseudoflavor;
2036 else
2037 args->selected_flavor = RPC_AUTH_UNIX;
2038 if (!args->nfs_server.hostname)
2039 goto out_nomem;
2040
2041 if (!(data->flags & NFS_MOUNT_NONLM))
2042 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2043 NFS_MOUNT_LOCAL_FCNTL);
2044 else
2045 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2046 NFS_MOUNT_LOCAL_FCNTL);
2047 /*
2048 * The legacy version 6 binary mount data from userspace has a
2049 * field used only to transport selinux information into the
2050 * the kernel. To continue to support that functionality we
2051 * have a touch of selinux knowledge here in the NFS code. The
2052 * userspace code converted context=blah to just blah so we are
2053 * converting back to the full string selinux understands.
2054 */
2055 if (data->context[0]){
2056 #ifdef CONFIG_SECURITY_SELINUX
2057 int rc;
2058 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2059 if (!opts_str)
2060 return -ENOMEM;
2061 strcpy(opts_str, "context=");
2062 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2063 strcat(opts_str, &data->context[0]);
2064 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2065 kfree(opts_str);
2066 if (rc)
2067 return rc;
2068 #else
2069 return -EINVAL;
2070 #endif
2071 }
2072
2073 break;
2074 default:
2075 return NFS_TEXT_DATA;
2076 }
2077
2078 return 0;
2079
2080 out_no_data:
2081 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2082 return -EINVAL;
2083
2084 out_no_v3:
2085 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2086 data->version);
2087 return -EINVAL;
2088
2089 out_no_sec:
2090 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2091 return -EINVAL;
2092
2093 out_nomem:
2094 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2095 return -ENOMEM;
2096
2097 out_no_address:
2098 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2099 return -EINVAL;
2100
2101 out_invalid_fh:
2102 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2103 return -EINVAL;
2104 }
2105
2106 #if IS_ENABLED(CONFIG_NFS_V4)
nfs_validate_mount_data(struct file_system_type * fs_type,void * options,struct nfs_parsed_mount_data * args,struct nfs_fh * mntfh,const char * dev_name)2107 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2108 void *options,
2109 struct nfs_parsed_mount_data *args,
2110 struct nfs_fh *mntfh,
2111 const char *dev_name)
2112 {
2113 if (fs_type == &nfs_fs_type)
2114 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2115 return nfs4_validate_mount_data(options, args, dev_name);
2116 }
2117 #else
nfs_validate_mount_data(struct file_system_type * fs_type,void * options,struct nfs_parsed_mount_data * args,struct nfs_fh * mntfh,const char * dev_name)2118 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2119 void *options,
2120 struct nfs_parsed_mount_data *args,
2121 struct nfs_fh *mntfh,
2122 const char *dev_name)
2123 {
2124 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2125 }
2126 #endif
2127
nfs_validate_text_mount_data(void * options,struct nfs_parsed_mount_data * args,const char * dev_name)2128 static int nfs_validate_text_mount_data(void *options,
2129 struct nfs_parsed_mount_data *args,
2130 const char *dev_name)
2131 {
2132 int port = 0;
2133 int max_namelen = PAGE_SIZE;
2134 int max_pathlen = NFS_MAXPATHLEN;
2135 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2136
2137 if (nfs_parse_mount_options((char *)options, args) == 0)
2138 return -EINVAL;
2139
2140 if (!nfs_verify_server_address(sap))
2141 goto out_no_address;
2142
2143 if (args->version == 4) {
2144 #if IS_ENABLED(CONFIG_NFS_V4)
2145 port = NFS_PORT;
2146 max_namelen = NFS4_MAXNAMLEN;
2147 max_pathlen = NFS4_MAXPATHLEN;
2148 nfs_validate_transport_protocol(args);
2149 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2150 goto out_invalid_transport_udp;
2151 nfs4_validate_mount_flags(args);
2152 #else
2153 goto out_v4_not_compiled;
2154 #endif /* CONFIG_NFS_V4 */
2155 } else
2156 nfs_set_mount_transport_protocol(args);
2157
2158 nfs_set_port(sap, &args->nfs_server.port, port);
2159
2160 return nfs_parse_devname(dev_name,
2161 &args->nfs_server.hostname,
2162 max_namelen,
2163 &args->nfs_server.export_path,
2164 max_pathlen);
2165
2166 #if !IS_ENABLED(CONFIG_NFS_V4)
2167 out_v4_not_compiled:
2168 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2169 return -EPROTONOSUPPORT;
2170 #else
2171 out_invalid_transport_udp:
2172 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2173 return -EINVAL;
2174 #endif /* !CONFIG_NFS_V4 */
2175
2176 out_no_address:
2177 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2178 return -EINVAL;
2179 }
2180
2181 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2182 | NFS_MOUNT_SECURE \
2183 | NFS_MOUNT_TCP \
2184 | NFS_MOUNT_VER3 \
2185 | NFS_MOUNT_KERBEROS \
2186 | NFS_MOUNT_NONLM \
2187 | NFS_MOUNT_BROKEN_SUID \
2188 | NFS_MOUNT_STRICTLOCK \
2189 | NFS_MOUNT_LEGACY_INTERFACE)
2190
2191 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2192 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2193
2194 static int
nfs_compare_remount_data(struct nfs_server * nfss,struct nfs_parsed_mount_data * data)2195 nfs_compare_remount_data(struct nfs_server *nfss,
2196 struct nfs_parsed_mount_data *data)
2197 {
2198 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2199 data->rsize != nfss->rsize ||
2200 data->wsize != nfss->wsize ||
2201 data->version != nfss->nfs_client->rpc_ops->version ||
2202 data->minorversion != nfss->nfs_client->cl_minorversion ||
2203 data->retrans != nfss->client->cl_timeout->to_retries ||
2204 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2205 data->acregmin != nfss->acregmin / HZ ||
2206 data->acregmax != nfss->acregmax / HZ ||
2207 data->acdirmin != nfss->acdirmin / HZ ||
2208 data->acdirmax != nfss->acdirmax / HZ ||
2209 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2210 data->nfs_server.port != nfss->port ||
2211 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2212 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2213 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2214 return -EINVAL;
2215
2216 return 0;
2217 }
2218
2219 int
nfs_remount(struct super_block * sb,int * flags,char * raw_data)2220 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2221 {
2222 int error;
2223 struct nfs_server *nfss = sb->s_fs_info;
2224 struct nfs_parsed_mount_data *data;
2225 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2226 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2227 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2228
2229 sync_filesystem(sb);
2230
2231 /*
2232 * Userspace mount programs that send binary options generally send
2233 * them populated with default values. We have no way to know which
2234 * ones were explicitly specified. Fall back to legacy behavior and
2235 * just return success.
2236 */
2237 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2238 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2239 options->version <= 6))))
2240 return 0;
2241
2242 data = kzalloc(sizeof(*data), GFP_KERNEL);
2243 if (data == NULL)
2244 return -ENOMEM;
2245
2246 /* fill out struct with values from existing mount */
2247 data->flags = nfss->flags;
2248 data->rsize = nfss->rsize;
2249 data->wsize = nfss->wsize;
2250 data->retrans = nfss->client->cl_timeout->to_retries;
2251 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2252 data->acregmin = nfss->acregmin / HZ;
2253 data->acregmax = nfss->acregmax / HZ;
2254 data->acdirmin = nfss->acdirmin / HZ;
2255 data->acdirmax = nfss->acdirmax / HZ;
2256 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2257 data->nfs_server.port = nfss->port;
2258 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2259 data->version = nfsvers;
2260 data->minorversion = nfss->nfs_client->cl_minorversion;
2261 data->net = current->nsproxy->net_ns;
2262 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2263 data->nfs_server.addrlen);
2264
2265 /* overwrite those values with any that were specified */
2266 error = -EINVAL;
2267 if (!nfs_parse_mount_options((char *)options, data))
2268 goto out;
2269
2270 /*
2271 * noac is a special case. It implies -o sync, but that's not
2272 * necessarily reflected in the mtab options. do_remount_sb
2273 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2274 * remount options, so we have to explicitly reset it.
2275 */
2276 if (data->flags & NFS_MOUNT_NOAC)
2277 *flags |= MS_SYNCHRONOUS;
2278
2279 /* compare new mount options with old ones */
2280 error = nfs_compare_remount_data(nfss, data);
2281 out:
2282 kfree(data);
2283 return error;
2284 }
2285 EXPORT_SYMBOL_GPL(nfs_remount);
2286
2287 /*
2288 * Initialise the common bits of the superblock
2289 */
nfs_initialise_sb(struct super_block * sb)2290 inline void nfs_initialise_sb(struct super_block *sb)
2291 {
2292 struct nfs_server *server = NFS_SB(sb);
2293
2294 sb->s_magic = NFS_SUPER_MAGIC;
2295
2296 /* We probably want something more informative here */
2297 snprintf(sb->s_id, sizeof(sb->s_id),
2298 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2299
2300 if (sb->s_blocksize == 0)
2301 sb->s_blocksize = nfs_block_bits(server->wsize,
2302 &sb->s_blocksize_bits);
2303
2304 sb->s_bdi = &server->backing_dev_info;
2305
2306 nfs_super_set_maxbytes(sb, server->maxfilesize);
2307 }
2308
2309 /*
2310 * Finish setting up an NFS2/3 superblock
2311 */
nfs_fill_super(struct super_block * sb,struct nfs_mount_info * mount_info)2312 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2313 {
2314 struct nfs_parsed_mount_data *data = mount_info->parsed;
2315 struct nfs_server *server = NFS_SB(sb);
2316
2317 sb->s_blocksize_bits = 0;
2318 sb->s_blocksize = 0;
2319 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2320 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2321 if (data && data->bsize)
2322 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2323
2324 if (server->nfs_client->rpc_ops->version != 2) {
2325 /* The VFS shouldn't apply the umask to mode bits. We will do
2326 * so ourselves when necessary.
2327 */
2328 sb->s_flags |= MS_POSIXACL;
2329 sb->s_time_gran = 1;
2330 }
2331
2332 nfs_initialise_sb(sb);
2333 }
2334 EXPORT_SYMBOL_GPL(nfs_fill_super);
2335
2336 /*
2337 * Finish setting up a cloned NFS2/3/4 superblock
2338 */
nfs_clone_super(struct super_block * sb,struct nfs_mount_info * mount_info)2339 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2340 {
2341 const struct super_block *old_sb = mount_info->cloned->sb;
2342 struct nfs_server *server = NFS_SB(sb);
2343
2344 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2345 sb->s_blocksize = old_sb->s_blocksize;
2346 sb->s_maxbytes = old_sb->s_maxbytes;
2347 sb->s_xattr = old_sb->s_xattr;
2348 sb->s_op = old_sb->s_op;
2349 sb->s_time_gran = 1;
2350
2351 if (server->nfs_client->rpc_ops->version != 2) {
2352 /* The VFS shouldn't apply the umask to mode bits. We will do
2353 * so ourselves when necessary.
2354 */
2355 sb->s_flags |= MS_POSIXACL;
2356 }
2357
2358 nfs_initialise_sb(sb);
2359 }
2360
nfs_compare_mount_options(const struct super_block * s,const struct nfs_server * b,int flags)2361 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2362 {
2363 const struct nfs_server *a = s->s_fs_info;
2364 const struct rpc_clnt *clnt_a = a->client;
2365 const struct rpc_clnt *clnt_b = b->client;
2366
2367 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2368 goto Ebusy;
2369 if (a->nfs_client != b->nfs_client)
2370 goto Ebusy;
2371 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2372 goto Ebusy;
2373 if (a->wsize != b->wsize)
2374 goto Ebusy;
2375 if (a->rsize != b->rsize)
2376 goto Ebusy;
2377 if (a->acregmin != b->acregmin)
2378 goto Ebusy;
2379 if (a->acregmax != b->acregmax)
2380 goto Ebusy;
2381 if (a->acdirmin != b->acdirmin)
2382 goto Ebusy;
2383 if (a->acdirmax != b->acdirmax)
2384 goto Ebusy;
2385 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2386 goto Ebusy;
2387 return 1;
2388 Ebusy:
2389 return 0;
2390 }
2391
2392 struct nfs_sb_mountdata {
2393 struct nfs_server *server;
2394 int mntflags;
2395 };
2396
nfs_set_super(struct super_block * s,void * data)2397 static int nfs_set_super(struct super_block *s, void *data)
2398 {
2399 struct nfs_sb_mountdata *sb_mntdata = data;
2400 struct nfs_server *server = sb_mntdata->server;
2401 int ret;
2402
2403 s->s_flags = sb_mntdata->mntflags;
2404 s->s_fs_info = server;
2405 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2406 ret = set_anon_super(s, server);
2407 if (ret == 0)
2408 server->s_dev = s->s_dev;
2409 return ret;
2410 }
2411
nfs_compare_super_address(struct nfs_server * server1,struct nfs_server * server2)2412 static int nfs_compare_super_address(struct nfs_server *server1,
2413 struct nfs_server *server2)
2414 {
2415 struct sockaddr *sap1, *sap2;
2416
2417 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2418 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2419
2420 if (sap1->sa_family != sap2->sa_family)
2421 return 0;
2422
2423 switch (sap1->sa_family) {
2424 case AF_INET: {
2425 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2426 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2427 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2428 return 0;
2429 if (sin1->sin_port != sin2->sin_port)
2430 return 0;
2431 break;
2432 }
2433 case AF_INET6: {
2434 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2435 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2436 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2437 return 0;
2438 if (sin1->sin6_port != sin2->sin6_port)
2439 return 0;
2440 break;
2441 }
2442 default:
2443 return 0;
2444 }
2445
2446 return 1;
2447 }
2448
nfs_compare_super(struct super_block * sb,void * data)2449 static int nfs_compare_super(struct super_block *sb, void *data)
2450 {
2451 struct nfs_sb_mountdata *sb_mntdata = data;
2452 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2453 int mntflags = sb_mntdata->mntflags;
2454
2455 if (!nfs_compare_super_address(old, server))
2456 return 0;
2457 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2458 if (old->flags & NFS_MOUNT_UNSHARED)
2459 return 0;
2460 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2461 return 0;
2462 return nfs_compare_mount_options(sb, server, mntflags);
2463 }
2464
2465 #ifdef CONFIG_NFS_FSCACHE
nfs_get_cache_cookie(struct super_block * sb,struct nfs_parsed_mount_data * parsed,struct nfs_clone_mount * cloned)2466 static void nfs_get_cache_cookie(struct super_block *sb,
2467 struct nfs_parsed_mount_data *parsed,
2468 struct nfs_clone_mount *cloned)
2469 {
2470 struct nfs_server *nfss = NFS_SB(sb);
2471 char *uniq = NULL;
2472 int ulen = 0;
2473
2474 nfss->fscache_key = NULL;
2475 nfss->fscache = NULL;
2476
2477 if (parsed) {
2478 if (!(parsed->options & NFS_OPTION_FSCACHE))
2479 return;
2480 if (parsed->fscache_uniq) {
2481 uniq = parsed->fscache_uniq;
2482 ulen = strlen(parsed->fscache_uniq);
2483 }
2484 } else if (cloned) {
2485 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2486 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2487 return;
2488 if (mnt_s->fscache_key) {
2489 uniq = mnt_s->fscache_key->key.uniquifier;
2490 ulen = mnt_s->fscache_key->key.uniq_len;
2491 };
2492 } else
2493 return;
2494
2495 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2496 }
2497 #else
nfs_get_cache_cookie(struct super_block * sb,struct nfs_parsed_mount_data * parsed,struct nfs_clone_mount * cloned)2498 static void nfs_get_cache_cookie(struct super_block *sb,
2499 struct nfs_parsed_mount_data *parsed,
2500 struct nfs_clone_mount *cloned)
2501 {
2502 }
2503 #endif
2504
nfs_bdi_register(struct nfs_server * server)2505 static int nfs_bdi_register(struct nfs_server *server)
2506 {
2507 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2508 }
2509
nfs_set_sb_security(struct super_block * s,struct dentry * mntroot,struct nfs_mount_info * mount_info)2510 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2511 struct nfs_mount_info *mount_info)
2512 {
2513 int error;
2514 unsigned long kflags = 0, kflags_out = 0;
2515 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2516 kflags |= SECURITY_LSM_NATIVE_LABELS;
2517
2518 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2519 kflags, &kflags_out);
2520 if (error)
2521 goto err;
2522
2523 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2524 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2525 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2526 err:
2527 return error;
2528 }
2529 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2530
nfs_clone_sb_security(struct super_block * s,struct dentry * mntroot,struct nfs_mount_info * mount_info)2531 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2532 struct nfs_mount_info *mount_info)
2533 {
2534 /* clone any lsm security options from the parent to the new sb */
2535 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2536 return -ESTALE;
2537 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2538 }
2539 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2540
nfs_fs_mount_common(struct nfs_server * server,int flags,const char * dev_name,struct nfs_mount_info * mount_info,struct nfs_subversion * nfs_mod)2541 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2542 int flags, const char *dev_name,
2543 struct nfs_mount_info *mount_info,
2544 struct nfs_subversion *nfs_mod)
2545 {
2546 struct super_block *s;
2547 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2548 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2549 struct nfs_sb_mountdata sb_mntdata = {
2550 .mntflags = flags,
2551 .server = server,
2552 };
2553 int error;
2554
2555 if (server->flags & NFS_MOUNT_UNSHARED)
2556 compare_super = NULL;
2557
2558 /* -o noac implies -o sync */
2559 if (server->flags & NFS_MOUNT_NOAC)
2560 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2561
2562 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2563 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2564 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2565
2566 /* Get a superblock - note that we may end up sharing one that already exists */
2567 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2568 if (IS_ERR(s)) {
2569 mntroot = ERR_CAST(s);
2570 goto out_err_nosb;
2571 }
2572
2573 if (s->s_fs_info != server) {
2574 nfs_free_server(server);
2575 server = NULL;
2576 } else {
2577 error = nfs_bdi_register(server);
2578 if (error) {
2579 mntroot = ERR_PTR(error);
2580 goto error_splat_super;
2581 }
2582 server->super = s;
2583 }
2584
2585 if (!s->s_root) {
2586 /* initial superblock/root creation */
2587 mount_info->fill_super(s, mount_info);
2588 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2589 if (!(server->flags & NFS_MOUNT_UNSHARED))
2590 s->s_iflags |= SB_I_MULTIROOT;
2591 }
2592
2593 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2594 if (IS_ERR(mntroot))
2595 goto error_splat_super;
2596
2597 error = mount_info->set_security(s, mntroot, mount_info);
2598 if (error)
2599 goto error_splat_root;
2600
2601 s->s_flags |= MS_ACTIVE;
2602
2603 out:
2604 return mntroot;
2605
2606 out_err_nosb:
2607 nfs_free_server(server);
2608 goto out;
2609
2610 error_splat_root:
2611 dput(mntroot);
2612 mntroot = ERR_PTR(error);
2613 error_splat_super:
2614 deactivate_locked_super(s);
2615 goto out;
2616 }
2617 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2618
nfs_fs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2619 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2620 int flags, const char *dev_name, void *raw_data)
2621 {
2622 struct nfs_mount_info mount_info = {
2623 .fill_super = nfs_fill_super,
2624 .set_security = nfs_set_sb_security,
2625 };
2626 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2627 struct nfs_subversion *nfs_mod;
2628 int error;
2629
2630 mount_info.parsed = nfs_alloc_parsed_mount_data();
2631 mount_info.mntfh = nfs_alloc_fhandle();
2632 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2633 goto out;
2634
2635 /* Validate the mount data */
2636 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2637 if (error == NFS_TEXT_DATA)
2638 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2639 if (error < 0) {
2640 mntroot = ERR_PTR(error);
2641 goto out;
2642 }
2643
2644 nfs_mod = get_nfs_version(mount_info.parsed->version);
2645 if (IS_ERR(nfs_mod)) {
2646 mntroot = ERR_CAST(nfs_mod);
2647 goto out;
2648 }
2649
2650 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2651
2652 put_nfs_version(nfs_mod);
2653 out:
2654 nfs_free_parsed_mount_data(mount_info.parsed);
2655 nfs_free_fhandle(mount_info.mntfh);
2656 return mntroot;
2657 }
2658 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2659
2660 /*
2661 * Destroy an NFS2/3 superblock
2662 */
nfs_kill_super(struct super_block * s)2663 void nfs_kill_super(struct super_block *s)
2664 {
2665 struct nfs_server *server = NFS_SB(s);
2666 dev_t dev = s->s_dev;
2667
2668 generic_shutdown_super(s);
2669
2670 nfs_fscache_release_super_cookie(s);
2671
2672 nfs_free_server(server);
2673 free_anon_bdev(dev);
2674 }
2675 EXPORT_SYMBOL_GPL(nfs_kill_super);
2676
2677 /*
2678 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2679 */
2680 static struct dentry *
nfs_xdev_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2681 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2682 const char *dev_name, void *raw_data)
2683 {
2684 struct nfs_clone_mount *data = raw_data;
2685 struct nfs_mount_info mount_info = {
2686 .fill_super = nfs_clone_super,
2687 .set_security = nfs_clone_sb_security,
2688 .cloned = data,
2689 };
2690 struct nfs_server *server;
2691 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2692 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2693
2694 dprintk("--> nfs_xdev_mount()\n");
2695
2696 mount_info.mntfh = mount_info.cloned->fh;
2697
2698 /* create a new volume representation */
2699 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2700
2701 if (IS_ERR(server))
2702 mntroot = ERR_CAST(server);
2703 else
2704 mntroot = nfs_fs_mount_common(server, flags,
2705 dev_name, &mount_info, nfs_mod);
2706
2707 dprintk("<-- nfs_xdev_mount() = %ld\n",
2708 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2709 return mntroot;
2710 }
2711
2712 #if IS_ENABLED(CONFIG_NFS_V4)
2713
nfs4_validate_mount_flags(struct nfs_parsed_mount_data * args)2714 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2715 {
2716 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2717 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2718 }
2719
2720 /*
2721 * Validate NFSv4 mount options
2722 */
nfs4_validate_mount_data(void * options,struct nfs_parsed_mount_data * args,const char * dev_name)2723 static int nfs4_validate_mount_data(void *options,
2724 struct nfs_parsed_mount_data *args,
2725 const char *dev_name)
2726 {
2727 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2728 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2729 char *c;
2730
2731 if (data == NULL)
2732 goto out_no_data;
2733
2734 args->version = 4;
2735
2736 switch (data->version) {
2737 case 1:
2738 if (data->host_addrlen > sizeof(args->nfs_server.address))
2739 goto out_no_address;
2740 if (data->host_addrlen == 0)
2741 goto out_no_address;
2742 args->nfs_server.addrlen = data->host_addrlen;
2743 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2744 return -EFAULT;
2745 if (!nfs_verify_server_address(sap))
2746 goto out_no_address;
2747 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2748
2749 if (data->auth_flavourlen) {
2750 rpc_authflavor_t pseudoflavor;
2751 if (data->auth_flavourlen > 1)
2752 goto out_inval_auth;
2753 if (copy_from_user(&pseudoflavor,
2754 data->auth_flavours,
2755 sizeof(pseudoflavor)))
2756 return -EFAULT;
2757 args->selected_flavor = pseudoflavor;
2758 } else
2759 args->selected_flavor = RPC_AUTH_UNIX;
2760
2761 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2762 if (IS_ERR(c))
2763 return PTR_ERR(c);
2764 args->nfs_server.hostname = c;
2765
2766 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2767 if (IS_ERR(c))
2768 return PTR_ERR(c);
2769 args->nfs_server.export_path = c;
2770 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2771
2772 c = strndup_user(data->client_addr.data, 16);
2773 if (IS_ERR(c))
2774 return PTR_ERR(c);
2775 args->client_address = c;
2776
2777 /*
2778 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2779 * can deal with.
2780 */
2781
2782 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2783 args->rsize = data->rsize;
2784 args->wsize = data->wsize;
2785 args->timeo = data->timeo;
2786 args->retrans = data->retrans;
2787 args->acregmin = data->acregmin;
2788 args->acregmax = data->acregmax;
2789 args->acdirmin = data->acdirmin;
2790 args->acdirmax = data->acdirmax;
2791 args->nfs_server.protocol = data->proto;
2792 nfs_validate_transport_protocol(args);
2793 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2794 goto out_invalid_transport_udp;
2795
2796 break;
2797 default:
2798 return NFS_TEXT_DATA;
2799 }
2800
2801 return 0;
2802
2803 out_no_data:
2804 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2805 return -EINVAL;
2806
2807 out_inval_auth:
2808 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2809 data->auth_flavourlen);
2810 return -EINVAL;
2811
2812 out_no_address:
2813 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2814 return -EINVAL;
2815
2816 out_invalid_transport_udp:
2817 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2818 return -EINVAL;
2819 }
2820
2821 /*
2822 * NFS v4 module parameters need to stay in the
2823 * NFS client for backwards compatibility
2824 */
2825 unsigned int nfs_callback_set_tcpport;
2826 /* Default cache timeout is 10 minutes */
2827 unsigned int nfs_idmap_cache_timeout = 600;
2828 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2829 bool nfs4_disable_idmapping = true;
2830 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2831 unsigned short send_implementation_id = 1;
2832 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2833 bool recover_lost_locks = false;
2834
2835 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2836 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2837 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2838 EXPORT_SYMBOL_GPL(max_session_slots);
2839 EXPORT_SYMBOL_GPL(send_implementation_id);
2840 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2841 EXPORT_SYMBOL_GPL(recover_lost_locks);
2842
2843 #define NFS_CALLBACK_MAXPORTNR (65535U)
2844
param_set_portnr(const char * val,const struct kernel_param * kp)2845 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2846 {
2847 unsigned long num;
2848 int ret;
2849
2850 if (!val)
2851 return -EINVAL;
2852 ret = kstrtoul(val, 0, &num);
2853 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2854 return -EINVAL;
2855 *((unsigned int *)kp->arg) = num;
2856 return 0;
2857 }
2858 static const struct kernel_param_ops param_ops_portnr = {
2859 .set = param_set_portnr,
2860 .get = param_get_uint,
2861 };
2862 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2863
2864 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2865 module_param(nfs_idmap_cache_timeout, int, 0644);
2866 module_param(nfs4_disable_idmapping, bool, 0644);
2867 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2868 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2869 MODULE_PARM_DESC(nfs4_disable_idmapping,
2870 "Turn off NFSv4 idmapping when using 'sec=sys'");
2871 module_param(max_session_slots, ushort, 0644);
2872 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2873 "requests the client will negotiate");
2874 module_param(send_implementation_id, ushort, 0644);
2875 MODULE_PARM_DESC(send_implementation_id,
2876 "Send implementation ID with NFSv4.1 exchange_id");
2877 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2878
2879 module_param(recover_lost_locks, bool, 0644);
2880 MODULE_PARM_DESC(recover_lost_locks,
2881 "If the server reports that a lock might be lost, "
2882 "try to recover it risking data corruption.");
2883
2884
2885 #endif /* CONFIG_NFS_V4 */
2886