1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/super.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 * Split from inode.c by David Howells <dhowells@redhat.com>
16 *
17 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
18 * particular server are held in the same superblock
19 * - NFS superblocks can have several effective roots to the dentry tree
20 * - directory type roots are spliced into the tree when a path from one root reaches the root
21 * of another (see nfs_lookup())
22 */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26
27 #include <linux/time.h>
28 #include <linux/kernel.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/stat.h>
32 #include <linux/errno.h>
33 #include <linux/unistd.h>
34 #include <linux/sunrpc/clnt.h>
35 #include <linux/sunrpc/addr.h>
36 #include <linux/sunrpc/stats.h>
37 #include <linux/sunrpc/metrics.h>
38 #include <linux/sunrpc/xprtsock.h>
39 #include <linux/sunrpc/xprtrdma.h>
40 #include <linux/nfs_fs.h>
41 #include <linux/nfs_mount.h>
42 #include <linux/nfs4_mount.h>
43 #include <linux/lockd/bind.h>
44 #include <linux/seq_file.h>
45 #include <linux/mount.h>
46 #include <linux/namei.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56 #include <linux/nsproxy.h>
57 #include <linux/rcupdate.h>
58
59 #include <linux/uaccess.h>
60
61 #include "nfs4_fs.h"
62 #include "callback.h"
63 #include "delegation.h"
64 #include "iostat.h"
65 #include "internal.h"
66 #include "fscache.h"
67 #include "nfs4session.h"
68 #include "pnfs.h"
69 #include "nfs.h"
70
71 #define NFSDBG_FACILITY NFSDBG_VFS
72 #define NFS_TEXT_DATA 1
73
74 #if IS_ENABLED(CONFIG_NFS_V3)
75 #define NFS_DEFAULT_VERSION 3
76 #else
77 #define NFS_DEFAULT_VERSION 2
78 #endif
79
80 #define NFS_MAX_CONNECTIONS 16
81
82 enum {
83 /* Mount options that take no arguments */
84 Opt_soft, Opt_softerr, Opt_hard,
85 Opt_posix, Opt_noposix,
86 Opt_cto, Opt_nocto,
87 Opt_ac, Opt_noac,
88 Opt_lock, Opt_nolock,
89 Opt_udp, Opt_tcp, Opt_rdma,
90 Opt_acl, Opt_noacl,
91 Opt_rdirplus, Opt_nordirplus,
92 Opt_sharecache, Opt_nosharecache,
93 Opt_resvport, Opt_noresvport,
94 Opt_fscache, Opt_nofscache,
95 Opt_migration, Opt_nomigration,
96
97 /* Mount options that take integer arguments */
98 Opt_port,
99 Opt_rsize, Opt_wsize, Opt_bsize,
100 Opt_timeo, Opt_retrans,
101 Opt_acregmin, Opt_acregmax,
102 Opt_acdirmin, Opt_acdirmax,
103 Opt_actimeo,
104 Opt_namelen,
105 Opt_mountport,
106 Opt_mountvers,
107 Opt_minorversion,
108
109 /* Mount options that take string arguments */
110 Opt_nfsvers,
111 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
112 Opt_addr, Opt_mountaddr, Opt_clientaddr,
113 Opt_nconnect,
114 Opt_lookupcache,
115 Opt_fscache_uniq,
116 Opt_local_lock,
117
118 /* Special mount options */
119 Opt_userspace, Opt_deprecated, Opt_sloppy,
120
121 Opt_err
122 };
123
124 static const match_table_t nfs_mount_option_tokens = {
125 { Opt_userspace, "bg" },
126 { Opt_userspace, "fg" },
127 { Opt_userspace, "retry=%s" },
128
129 { Opt_sloppy, "sloppy" },
130
131 { Opt_soft, "soft" },
132 { Opt_softerr, "softerr" },
133 { Opt_hard, "hard" },
134 { Opt_deprecated, "intr" },
135 { Opt_deprecated, "nointr" },
136 { Opt_posix, "posix" },
137 { Opt_noposix, "noposix" },
138 { Opt_cto, "cto" },
139 { Opt_nocto, "nocto" },
140 { Opt_ac, "ac" },
141 { Opt_noac, "noac" },
142 { Opt_lock, "lock" },
143 { Opt_nolock, "nolock" },
144 { Opt_udp, "udp" },
145 { Opt_tcp, "tcp" },
146 { Opt_rdma, "rdma" },
147 { Opt_acl, "acl" },
148 { Opt_noacl, "noacl" },
149 { Opt_rdirplus, "rdirplus" },
150 { Opt_nordirplus, "nordirplus" },
151 { Opt_sharecache, "sharecache" },
152 { Opt_nosharecache, "nosharecache" },
153 { Opt_resvport, "resvport" },
154 { Opt_noresvport, "noresvport" },
155 { Opt_fscache, "fsc" },
156 { Opt_nofscache, "nofsc" },
157 { Opt_migration, "migration" },
158 { Opt_nomigration, "nomigration" },
159
160 { Opt_port, "port=%s" },
161 { Opt_rsize, "rsize=%s" },
162 { Opt_wsize, "wsize=%s" },
163 { Opt_bsize, "bsize=%s" },
164 { Opt_timeo, "timeo=%s" },
165 { Opt_retrans, "retrans=%s" },
166 { Opt_acregmin, "acregmin=%s" },
167 { Opt_acregmax, "acregmax=%s" },
168 { Opt_acdirmin, "acdirmin=%s" },
169 { Opt_acdirmax, "acdirmax=%s" },
170 { Opt_actimeo, "actimeo=%s" },
171 { Opt_namelen, "namlen=%s" },
172 { Opt_mountport, "mountport=%s" },
173 { Opt_mountvers, "mountvers=%s" },
174 { Opt_minorversion, "minorversion=%s" },
175
176 { Opt_nfsvers, "nfsvers=%s" },
177 { Opt_nfsvers, "vers=%s" },
178
179 { Opt_sec, "sec=%s" },
180 { Opt_proto, "proto=%s" },
181 { Opt_mountproto, "mountproto=%s" },
182 { Opt_addr, "addr=%s" },
183 { Opt_clientaddr, "clientaddr=%s" },
184 { Opt_mounthost, "mounthost=%s" },
185 { Opt_mountaddr, "mountaddr=%s" },
186
187 { Opt_nconnect, "nconnect=%s" },
188
189 { Opt_lookupcache, "lookupcache=%s" },
190 { Opt_fscache_uniq, "fsc=%s" },
191 { Opt_local_lock, "local_lock=%s" },
192
193 /* The following needs to be listed after all other options */
194 { Opt_nfsvers, "v%s" },
195
196 { Opt_err, NULL }
197 };
198
199 enum {
200 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
201 Opt_xprt_rdma6,
202
203 Opt_xprt_err
204 };
205
206 static const match_table_t nfs_xprt_protocol_tokens = {
207 { Opt_xprt_udp, "udp" },
208 { Opt_xprt_udp6, "udp6" },
209 { Opt_xprt_tcp, "tcp" },
210 { Opt_xprt_tcp6, "tcp6" },
211 { Opt_xprt_rdma, "rdma" },
212 { Opt_xprt_rdma6, "rdma6" },
213
214 { Opt_xprt_err, NULL }
215 };
216
217 enum {
218 Opt_sec_none, Opt_sec_sys,
219 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
220 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
221 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
222
223 Opt_sec_err
224 };
225
226 static const match_table_t nfs_secflavor_tokens = {
227 { Opt_sec_none, "none" },
228 { Opt_sec_none, "null" },
229 { Opt_sec_sys, "sys" },
230
231 { Opt_sec_krb5, "krb5" },
232 { Opt_sec_krb5i, "krb5i" },
233 { Opt_sec_krb5p, "krb5p" },
234
235 { Opt_sec_lkey, "lkey" },
236 { Opt_sec_lkeyi, "lkeyi" },
237 { Opt_sec_lkeyp, "lkeyp" },
238
239 { Opt_sec_spkm, "spkm3" },
240 { Opt_sec_spkmi, "spkm3i" },
241 { Opt_sec_spkmp, "spkm3p" },
242
243 { Opt_sec_err, NULL }
244 };
245
246 enum {
247 Opt_lookupcache_all, Opt_lookupcache_positive,
248 Opt_lookupcache_none,
249
250 Opt_lookupcache_err
251 };
252
253 static match_table_t nfs_lookupcache_tokens = {
254 { Opt_lookupcache_all, "all" },
255 { Opt_lookupcache_positive, "pos" },
256 { Opt_lookupcache_positive, "positive" },
257 { Opt_lookupcache_none, "none" },
258
259 { Opt_lookupcache_err, NULL }
260 };
261
262 enum {
263 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
264 Opt_local_lock_none,
265
266 Opt_local_lock_err
267 };
268
269 static match_table_t nfs_local_lock_tokens = {
270 { Opt_local_lock_all, "all" },
271 { Opt_local_lock_flock, "flock" },
272 { Opt_local_lock_posix, "posix" },
273 { Opt_local_lock_none, "none" },
274
275 { Opt_local_lock_err, NULL }
276 };
277
278 enum {
279 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
280 Opt_vers_4_1, Opt_vers_4_2,
281
282 Opt_vers_err
283 };
284
285 static match_table_t nfs_vers_tokens = {
286 { Opt_vers_2, "2" },
287 { Opt_vers_3, "3" },
288 { Opt_vers_4, "4" },
289 { Opt_vers_4_0, "4.0" },
290 { Opt_vers_4_1, "4.1" },
291 { Opt_vers_4_2, "4.2" },
292
293 { Opt_vers_err, NULL }
294 };
295
296 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
297 int flags, const char *dev_name, void *raw_data);
298
299 struct file_system_type nfs_fs_type = {
300 .owner = THIS_MODULE,
301 .name = "nfs",
302 .mount = nfs_fs_mount,
303 .kill_sb = nfs_kill_super,
304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
305 };
306 MODULE_ALIAS_FS("nfs");
307 EXPORT_SYMBOL_GPL(nfs_fs_type);
308
309 struct file_system_type nfs_xdev_fs_type = {
310 .owner = THIS_MODULE,
311 .name = "nfs",
312 .mount = nfs_xdev_mount,
313 .kill_sb = nfs_kill_super,
314 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
315 };
316
317 const struct super_operations nfs_sops = {
318 .alloc_inode = nfs_alloc_inode,
319 .free_inode = nfs_free_inode,
320 .write_inode = nfs_write_inode,
321 .drop_inode = nfs_drop_inode,
322 .statfs = nfs_statfs,
323 .evict_inode = nfs_evict_inode,
324 .umount_begin = nfs_umount_begin,
325 .show_options = nfs_show_options,
326 .show_devname = nfs_show_devname,
327 .show_path = nfs_show_path,
328 .show_stats = nfs_show_stats,
329 .remount_fs = nfs_remount,
330 };
331 EXPORT_SYMBOL_GPL(nfs_sops);
332
333 #if IS_ENABLED(CONFIG_NFS_V4)
334 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
335 static int nfs4_validate_mount_data(void *options,
336 struct nfs_parsed_mount_data *args, const char *dev_name);
337
338 struct file_system_type nfs4_fs_type = {
339 .owner = THIS_MODULE,
340 .name = "nfs4",
341 .mount = nfs_fs_mount,
342 .kill_sb = nfs_kill_super,
343 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
344 };
345 MODULE_ALIAS_FS("nfs4");
346 MODULE_ALIAS("nfs4");
347 EXPORT_SYMBOL_GPL(nfs4_fs_type);
348
register_nfs4_fs(void)349 static int __init register_nfs4_fs(void)
350 {
351 return register_filesystem(&nfs4_fs_type);
352 }
353
unregister_nfs4_fs(void)354 static void unregister_nfs4_fs(void)
355 {
356 unregister_filesystem(&nfs4_fs_type);
357 }
358 #else
register_nfs4_fs(void)359 static int __init register_nfs4_fs(void)
360 {
361 return 0;
362 }
363
unregister_nfs4_fs(void)364 static void unregister_nfs4_fs(void)
365 {
366 }
367 #endif
368
369 static struct shrinker acl_shrinker = {
370 .count_objects = nfs_access_cache_count,
371 .scan_objects = nfs_access_cache_scan,
372 .seeks = DEFAULT_SEEKS,
373 };
374
375 /*
376 * Register the NFS filesystems
377 */
register_nfs_fs(void)378 int __init register_nfs_fs(void)
379 {
380 int ret;
381
382 ret = register_filesystem(&nfs_fs_type);
383 if (ret < 0)
384 goto error_0;
385
386 ret = register_nfs4_fs();
387 if (ret < 0)
388 goto error_1;
389
390 ret = nfs_register_sysctl();
391 if (ret < 0)
392 goto error_2;
393 ret = register_shrinker(&acl_shrinker);
394 if (ret < 0)
395 goto error_3;
396 return 0;
397 error_3:
398 nfs_unregister_sysctl();
399 error_2:
400 unregister_nfs4_fs();
401 error_1:
402 unregister_filesystem(&nfs_fs_type);
403 error_0:
404 return ret;
405 }
406
407 /*
408 * Unregister the NFS filesystems
409 */
unregister_nfs_fs(void)410 void __exit unregister_nfs_fs(void)
411 {
412 unregister_shrinker(&acl_shrinker);
413 nfs_unregister_sysctl();
414 unregister_nfs4_fs();
415 unregister_filesystem(&nfs_fs_type);
416 }
417
nfs_sb_active(struct super_block * sb)418 bool nfs_sb_active(struct super_block *sb)
419 {
420 struct nfs_server *server = NFS_SB(sb);
421
422 if (!atomic_inc_not_zero(&sb->s_active))
423 return false;
424 if (atomic_inc_return(&server->active) != 1)
425 atomic_dec(&sb->s_active);
426 return true;
427 }
428 EXPORT_SYMBOL_GPL(nfs_sb_active);
429
nfs_sb_deactive(struct super_block * sb)430 void nfs_sb_deactive(struct super_block *sb)
431 {
432 struct nfs_server *server = NFS_SB(sb);
433
434 if (atomic_dec_and_test(&server->active))
435 deactivate_super(sb);
436 }
437 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
438
__nfs_list_for_each_server(struct list_head * head,int (* fn)(struct nfs_server *,void *),void * data)439 static int __nfs_list_for_each_server(struct list_head *head,
440 int (*fn)(struct nfs_server *, void *),
441 void *data)
442 {
443 struct nfs_server *server, *last = NULL;
444 int ret = 0;
445
446 rcu_read_lock();
447 list_for_each_entry_rcu(server, head, client_link) {
448 if (!(server->super && nfs_sb_active(server->super)))
449 continue;
450 rcu_read_unlock();
451 if (last)
452 nfs_sb_deactive(last->super);
453 last = server;
454 ret = fn(server, data);
455 if (ret)
456 goto out;
457 rcu_read_lock();
458 }
459 rcu_read_unlock();
460 out:
461 if (last)
462 nfs_sb_deactive(last->super);
463 return ret;
464 }
465
nfs_client_for_each_server(struct nfs_client * clp,int (* fn)(struct nfs_server *,void *),void * data)466 int nfs_client_for_each_server(struct nfs_client *clp,
467 int (*fn)(struct nfs_server *, void *),
468 void *data)
469 {
470 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data);
471 }
472 EXPORT_SYMBOL_GPL(nfs_client_for_each_server);
473
474 /*
475 * Deliver file system statistics to userspace
476 */
nfs_statfs(struct dentry * dentry,struct kstatfs * buf)477 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
478 {
479 struct nfs_server *server = NFS_SB(dentry->d_sb);
480 unsigned char blockbits;
481 unsigned long blockres;
482 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
483 struct nfs_fsstat res;
484 int error = -ENOMEM;
485
486 res.fattr = nfs_alloc_fattr();
487 if (res.fattr == NULL)
488 goto out_err;
489
490 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
491 if (unlikely(error == -ESTALE)) {
492 struct dentry *pd_dentry;
493
494 pd_dentry = dget_parent(dentry);
495 nfs_zap_caches(d_inode(pd_dentry));
496 dput(pd_dentry);
497 }
498 nfs_free_fattr(res.fattr);
499 if (error < 0)
500 goto out_err;
501
502 buf->f_type = NFS_SUPER_MAGIC;
503
504 /*
505 * Current versions of glibc do not correctly handle the
506 * case where f_frsize != f_bsize. Eventually we want to
507 * report the value of wtmult in this field.
508 */
509 buf->f_frsize = dentry->d_sb->s_blocksize;
510
511 /*
512 * On most *nix systems, f_blocks, f_bfree, and f_bavail
513 * are reported in units of f_frsize. Linux hasn't had
514 * an f_frsize field in its statfs struct until recently,
515 * thus historically Linux's sys_statfs reports these
516 * fields in units of f_bsize.
517 */
518 buf->f_bsize = dentry->d_sb->s_blocksize;
519 blockbits = dentry->d_sb->s_blocksize_bits;
520 blockres = (1 << blockbits) - 1;
521 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
522 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
523 buf->f_bavail = (res.abytes + blockres) >> blockbits;
524
525 buf->f_files = res.tfiles;
526 buf->f_ffree = res.afiles;
527
528 buf->f_namelen = server->namelen;
529
530 return 0;
531
532 out_err:
533 dprintk("%s: statfs error = %d\n", __func__, -error);
534 return error;
535 }
536 EXPORT_SYMBOL_GPL(nfs_statfs);
537
538 /*
539 * Map the security flavour number to a name
540 */
nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)541 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
542 {
543 static const struct {
544 rpc_authflavor_t flavour;
545 const char *str;
546 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
547 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
548 { RPC_AUTH_NULL, "null" },
549 { RPC_AUTH_UNIX, "sys" },
550 { RPC_AUTH_GSS_KRB5, "krb5" },
551 { RPC_AUTH_GSS_KRB5I, "krb5i" },
552 { RPC_AUTH_GSS_KRB5P, "krb5p" },
553 { RPC_AUTH_GSS_LKEY, "lkey" },
554 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
555 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
556 { RPC_AUTH_GSS_SPKM, "spkm" },
557 { RPC_AUTH_GSS_SPKMI, "spkmi" },
558 { RPC_AUTH_GSS_SPKMP, "spkmp" },
559 { UINT_MAX, "unknown" }
560 };
561 int i;
562
563 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
564 if (sec_flavours[i].flavour == flavour)
565 break;
566 }
567 return sec_flavours[i].str;
568 }
569
nfs_show_mountd_netid(struct seq_file * m,struct nfs_server * nfss,int showdefaults)570 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
571 int showdefaults)
572 {
573 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
574 char *proto = NULL;
575
576 switch (sap->sa_family) {
577 case AF_INET:
578 switch (nfss->mountd_protocol) {
579 case IPPROTO_UDP:
580 proto = RPCBIND_NETID_UDP;
581 break;
582 case IPPROTO_TCP:
583 proto = RPCBIND_NETID_TCP;
584 break;
585 }
586 break;
587 case AF_INET6:
588 switch (nfss->mountd_protocol) {
589 case IPPROTO_UDP:
590 proto = RPCBIND_NETID_UDP6;
591 break;
592 case IPPROTO_TCP:
593 proto = RPCBIND_NETID_TCP6;
594 break;
595 }
596 break;
597 }
598 if (proto || showdefaults)
599 seq_printf(m, ",mountproto=%s", proto ?: "auto");
600 }
601
nfs_show_mountd_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)602 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
603 int showdefaults)
604 {
605 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
606
607 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
608 return;
609
610 switch (sap->sa_family) {
611 case AF_INET: {
612 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
613 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
614 break;
615 }
616 case AF_INET6: {
617 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
618 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
619 break;
620 }
621 default:
622 if (showdefaults)
623 seq_puts(m, ",mountaddr=unspecified");
624 }
625
626 if (nfss->mountd_version || showdefaults)
627 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
628 if ((nfss->mountd_port &&
629 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
630 showdefaults)
631 seq_printf(m, ",mountport=%u", nfss->mountd_port);
632
633 nfs_show_mountd_netid(m, nfss, showdefaults);
634 }
635
636 #if IS_ENABLED(CONFIG_NFS_V4)
nfs_show_nfsv4_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)637 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
638 int showdefaults)
639 {
640 struct nfs_client *clp = nfss->nfs_client;
641
642 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
643 }
644 #else
nfs_show_nfsv4_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)645 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
646 int showdefaults)
647 {
648 }
649 #endif
650
nfs_show_nfs_version(struct seq_file * m,unsigned int version,unsigned int minorversion)651 static void nfs_show_nfs_version(struct seq_file *m,
652 unsigned int version,
653 unsigned int minorversion)
654 {
655 seq_printf(m, ",vers=%u", version);
656 if (version == 4)
657 seq_printf(m, ".%u", minorversion);
658 }
659
660 /*
661 * Describe the mount options in force on this server representation
662 */
nfs_show_mount_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)663 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
664 int showdefaults)
665 {
666 static const struct proc_nfs_info {
667 int flag;
668 const char *str;
669 const char *nostr;
670 } nfs_info[] = {
671 { NFS_MOUNT_SOFT, ",soft", "" },
672 { NFS_MOUNT_SOFTERR, ",softerr", "" },
673 { NFS_MOUNT_POSIX, ",posix", "" },
674 { NFS_MOUNT_NOCTO, ",nocto", "" },
675 { NFS_MOUNT_NOAC, ",noac", "" },
676 { NFS_MOUNT_NONLM, ",nolock", "" },
677 { NFS_MOUNT_NOACL, ",noacl", "" },
678 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
679 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
680 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
681 { 0, NULL, NULL }
682 };
683 const struct proc_nfs_info *nfs_infop;
684 struct nfs_client *clp = nfss->nfs_client;
685 u32 version = clp->rpc_ops->version;
686 int local_flock, local_fcntl;
687
688 nfs_show_nfs_version(m, version, clp->cl_minorversion);
689 seq_printf(m, ",rsize=%u", nfss->rsize);
690 seq_printf(m, ",wsize=%u", nfss->wsize);
691 if (nfss->bsize != 0)
692 seq_printf(m, ",bsize=%u", nfss->bsize);
693 seq_printf(m, ",namlen=%u", nfss->namelen);
694 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
695 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
696 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
697 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
698 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
699 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
700 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
701 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
702 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
703 seq_puts(m, ",hard");
704 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
705 if (nfss->flags & nfs_infop->flag)
706 seq_puts(m, nfs_infop->str);
707 else
708 seq_puts(m, nfs_infop->nostr);
709 }
710 rcu_read_lock();
711 seq_printf(m, ",proto=%s",
712 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
713 rcu_read_unlock();
714 if (clp->cl_nconnect > 0)
715 seq_printf(m, ",nconnect=%u", clp->cl_nconnect);
716 if (version == 4) {
717 if (nfss->port != NFS_PORT)
718 seq_printf(m, ",port=%u", nfss->port);
719 } else
720 if (nfss->port)
721 seq_printf(m, ",port=%u", nfss->port);
722
723 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
724 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
725 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
726
727 if (version != 4)
728 nfs_show_mountd_options(m, nfss, showdefaults);
729 else
730 nfs_show_nfsv4_options(m, nfss, showdefaults);
731
732 if (nfss->options & NFS_OPTION_FSCACHE)
733 seq_puts(m, ",fsc");
734
735 if (nfss->options & NFS_OPTION_MIGRATION)
736 seq_puts(m, ",migration");
737
738 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
739 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
740 seq_puts(m, ",lookupcache=none");
741 else
742 seq_puts(m, ",lookupcache=pos");
743 }
744
745 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
746 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
747
748 if (!local_flock && !local_fcntl)
749 seq_puts(m, ",local_lock=none");
750 else if (local_flock && local_fcntl)
751 seq_puts(m, ",local_lock=all");
752 else if (local_flock)
753 seq_puts(m, ",local_lock=flock");
754 else
755 seq_puts(m, ",local_lock=posix");
756 }
757
758 /*
759 * Describe the mount options on this VFS mountpoint
760 */
nfs_show_options(struct seq_file * m,struct dentry * root)761 int nfs_show_options(struct seq_file *m, struct dentry *root)
762 {
763 struct nfs_server *nfss = NFS_SB(root->d_sb);
764
765 nfs_show_mount_options(m, nfss, 0);
766
767 rcu_read_lock();
768 seq_printf(m, ",addr=%s",
769 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
770 RPC_DISPLAY_ADDR));
771 rcu_read_unlock();
772
773 return 0;
774 }
775 EXPORT_SYMBOL_GPL(nfs_show_options);
776
777 #if IS_ENABLED(CONFIG_NFS_V4)
show_lease(struct seq_file * m,struct nfs_server * server)778 static void show_lease(struct seq_file *m, struct nfs_server *server)
779 {
780 struct nfs_client *clp = server->nfs_client;
781 unsigned long expire;
782
783 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ);
784 expire = clp->cl_last_renewal + clp->cl_lease_time;
785 seq_printf(m, ",lease_expired=%ld",
786 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ);
787 }
788 #ifdef CONFIG_NFS_V4_1
show_sessions(struct seq_file * m,struct nfs_server * server)789 static void show_sessions(struct seq_file *m, struct nfs_server *server)
790 {
791 if (nfs4_has_session(server->nfs_client))
792 seq_puts(m, ",sessions");
793 }
794 #else
show_sessions(struct seq_file * m,struct nfs_server * server)795 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
796 #endif
797 #endif
798
799 #ifdef CONFIG_NFS_V4_1
show_pnfs(struct seq_file * m,struct nfs_server * server)800 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
801 {
802 seq_printf(m, ",pnfs=");
803 if (server->pnfs_curr_ld)
804 seq_printf(m, "%s", server->pnfs_curr_ld->name);
805 else
806 seq_printf(m, "not configured");
807 }
808
show_implementation_id(struct seq_file * m,struct nfs_server * nfss)809 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
810 {
811 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
812 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
813 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
814 "date='%llu,%u'",
815 impl_id->name, impl_id->domain,
816 impl_id->date.seconds, impl_id->date.nseconds);
817 }
818 }
819 #else
820 #if IS_ENABLED(CONFIG_NFS_V4)
show_pnfs(struct seq_file * m,struct nfs_server * server)821 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
822 {
823 }
824 #endif
show_implementation_id(struct seq_file * m,struct nfs_server * nfss)825 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
826 {
827 }
828 #endif
829
nfs_show_devname(struct seq_file * m,struct dentry * root)830 int nfs_show_devname(struct seq_file *m, struct dentry *root)
831 {
832 char *page = (char *) __get_free_page(GFP_KERNEL);
833 char *devname, *dummy;
834 int err = 0;
835 if (!page)
836 return -ENOMEM;
837 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
838 if (IS_ERR(devname))
839 err = PTR_ERR(devname);
840 else
841 seq_escape(m, devname, " \t\n\\");
842 free_page((unsigned long)page);
843 return err;
844 }
845 EXPORT_SYMBOL_GPL(nfs_show_devname);
846
nfs_show_path(struct seq_file * m,struct dentry * dentry)847 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
848 {
849 seq_puts(m, "/");
850 return 0;
851 }
852 EXPORT_SYMBOL_GPL(nfs_show_path);
853
854 /*
855 * Present statistical information for this VFS mountpoint
856 */
nfs_show_stats(struct seq_file * m,struct dentry * root)857 int nfs_show_stats(struct seq_file *m, struct dentry *root)
858 {
859 int i, cpu;
860 struct nfs_server *nfss = NFS_SB(root->d_sb);
861 struct rpc_auth *auth = nfss->client->cl_auth;
862 struct nfs_iostats totals = { };
863
864 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
865
866 /*
867 * Display all mount option settings
868 */
869 seq_puts(m, "\n\topts:\t");
870 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
871 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
872 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
873 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
874 nfs_show_mount_options(m, nfss, 1);
875
876 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
877
878 show_implementation_id(m, nfss);
879
880 seq_puts(m, "\n\tcaps:\t");
881 seq_printf(m, "caps=0x%x", nfss->caps);
882 seq_printf(m, ",wtmult=%u", nfss->wtmult);
883 seq_printf(m, ",dtsize=%u", nfss->dtsize);
884 seq_printf(m, ",bsize=%u", nfss->bsize);
885 seq_printf(m, ",namlen=%u", nfss->namelen);
886
887 #if IS_ENABLED(CONFIG_NFS_V4)
888 if (nfss->nfs_client->rpc_ops->version == 4) {
889 seq_puts(m, "\n\tnfsv4:\t");
890 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
891 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
892 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
893 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
894 show_sessions(m, nfss);
895 show_pnfs(m, nfss);
896 show_lease(m, nfss);
897 }
898 #endif
899
900 /*
901 * Display security flavor in effect for this mount
902 */
903 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
904 if (auth->au_flavor)
905 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
906
907 /*
908 * Display superblock I/O counters
909 */
910 for_each_possible_cpu(cpu) {
911 struct nfs_iostats *stats;
912
913 preempt_disable();
914 stats = per_cpu_ptr(nfss->io_stats, cpu);
915
916 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
917 totals.events[i] += stats->events[i];
918 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
919 totals.bytes[i] += stats->bytes[i];
920 #ifdef CONFIG_NFS_FSCACHE
921 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
922 totals.fscache[i] += stats->fscache[i];
923 #endif
924
925 preempt_enable();
926 }
927
928 seq_puts(m, "\n\tevents:\t");
929 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
930 seq_printf(m, "%lu ", totals.events[i]);
931 seq_puts(m, "\n\tbytes:\t");
932 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
933 seq_printf(m, "%Lu ", totals.bytes[i]);
934 #ifdef CONFIG_NFS_FSCACHE
935 if (nfss->options & NFS_OPTION_FSCACHE) {
936 seq_puts(m, "\n\tfsc:\t");
937 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
938 seq_printf(m, "%Lu ", totals.fscache[i]);
939 }
940 #endif
941 seq_putc(m, '\n');
942
943 rpc_clnt_show_stats(m, nfss->client);
944
945 return 0;
946 }
947 EXPORT_SYMBOL_GPL(nfs_show_stats);
948
949 /*
950 * Begin unmount by attempting to remove all automounted mountpoints we added
951 * in response to xdev traversals and referrals
952 */
nfs_umount_begin(struct super_block * sb)953 void nfs_umount_begin(struct super_block *sb)
954 {
955 struct nfs_server *server;
956 struct rpc_clnt *rpc;
957
958 server = NFS_SB(sb);
959 /* -EIO all pending I/O */
960 rpc = server->client_acl;
961 if (!IS_ERR(rpc))
962 rpc_killall_tasks(rpc);
963 rpc = server->client;
964 if (!IS_ERR(rpc))
965 rpc_killall_tasks(rpc);
966 }
967 EXPORT_SYMBOL_GPL(nfs_umount_begin);
968
nfs_alloc_parsed_mount_data(void)969 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
970 {
971 struct nfs_parsed_mount_data *data;
972
973 data = kzalloc(sizeof(*data), GFP_KERNEL);
974 if (data) {
975 data->timeo = NFS_UNSPEC_TIMEO;
976 data->retrans = NFS_UNSPEC_RETRANS;
977 data->acregmin = NFS_DEF_ACREGMIN;
978 data->acregmax = NFS_DEF_ACREGMAX;
979 data->acdirmin = NFS_DEF_ACDIRMIN;
980 data->acdirmax = NFS_DEF_ACDIRMAX;
981 data->mount_server.port = NFS_UNSPEC_PORT;
982 data->nfs_server.port = NFS_UNSPEC_PORT;
983 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
984 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
985 data->minorversion = 0;
986 data->need_mount = true;
987 data->net = current->nsproxy->net_ns;
988 data->lsm_opts = NULL;
989 }
990 return data;
991 }
992
nfs_free_parsed_mount_data(struct nfs_parsed_mount_data * data)993 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
994 {
995 if (data) {
996 kfree(data->client_address);
997 kfree(data->mount_server.hostname);
998 kfree(data->nfs_server.export_path);
999 kfree(data->nfs_server.hostname);
1000 kfree(data->fscache_uniq);
1001 security_free_mnt_opts(&data->lsm_opts);
1002 kfree(data);
1003 }
1004 }
1005
1006 /*
1007 * Sanity-check a server address provided by the mount command.
1008 *
1009 * Address family must be initialized, and address must not be
1010 * the ANY address for that family.
1011 */
nfs_verify_server_address(struct sockaddr * addr)1012 static int nfs_verify_server_address(struct sockaddr *addr)
1013 {
1014 switch (addr->sa_family) {
1015 case AF_INET: {
1016 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
1017 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
1018 }
1019 case AF_INET6: {
1020 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1021 return !ipv6_addr_any(sa);
1022 }
1023 }
1024
1025 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
1026 return 0;
1027 }
1028
1029 /*
1030 * Select between a default port value and a user-specified port value.
1031 * If a zero value is set, then autobind will be used.
1032 */
nfs_set_port(struct sockaddr * sap,int * port,const unsigned short default_port)1033 static void nfs_set_port(struct sockaddr *sap, int *port,
1034 const unsigned short default_port)
1035 {
1036 if (*port == NFS_UNSPEC_PORT)
1037 *port = default_port;
1038
1039 rpc_set_port(sap, *port);
1040 }
1041
1042 /*
1043 * Sanity check the NFS transport protocol.
1044 *
1045 */
nfs_validate_transport_protocol(struct nfs_parsed_mount_data * mnt)1046 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1047 {
1048 switch (mnt->nfs_server.protocol) {
1049 case XPRT_TRANSPORT_UDP:
1050 case XPRT_TRANSPORT_TCP:
1051 case XPRT_TRANSPORT_RDMA:
1052 break;
1053 default:
1054 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1055 }
1056 }
1057
1058 /*
1059 * For text based NFSv2/v3 mounts, the mount protocol transport default
1060 * settings should depend upon the specified NFS transport.
1061 */
nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data * mnt)1062 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1063 {
1064 nfs_validate_transport_protocol(mnt);
1065
1066 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1067 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1068 return;
1069 switch (mnt->nfs_server.protocol) {
1070 case XPRT_TRANSPORT_UDP:
1071 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1072 break;
1073 case XPRT_TRANSPORT_TCP:
1074 case XPRT_TRANSPORT_RDMA:
1075 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1076 }
1077 }
1078
1079 /*
1080 * Add 'flavor' to 'auth_info' if not already present.
1081 * Returns true if 'flavor' ends up in the list, false otherwise
1082 */
nfs_auth_info_add(struct nfs_auth_info * auth_info,rpc_authflavor_t flavor)1083 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1084 rpc_authflavor_t flavor)
1085 {
1086 unsigned int i;
1087 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1088
1089 /* make sure this flavor isn't already in the list */
1090 for (i = 0; i < auth_info->flavor_len; i++) {
1091 if (flavor == auth_info->flavors[i])
1092 return true;
1093 }
1094
1095 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1096 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1097 return false;
1098 }
1099
1100 auth_info->flavors[auth_info->flavor_len++] = flavor;
1101 return true;
1102 }
1103
1104 /*
1105 * Return true if 'match' is in auth_info or auth_info is empty.
1106 * Return false otherwise.
1107 */
nfs_auth_info_match(const struct nfs_auth_info * auth_info,rpc_authflavor_t match)1108 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1109 rpc_authflavor_t match)
1110 {
1111 int i;
1112
1113 if (!auth_info->flavor_len)
1114 return true;
1115
1116 for (i = 0; i < auth_info->flavor_len; i++) {
1117 if (auth_info->flavors[i] == match)
1118 return true;
1119 }
1120 return false;
1121 }
1122 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1123
1124 /*
1125 * Parse the value of the 'sec=' option.
1126 */
nfs_parse_security_flavors(char * value,struct nfs_parsed_mount_data * mnt)1127 static int nfs_parse_security_flavors(char *value,
1128 struct nfs_parsed_mount_data *mnt)
1129 {
1130 substring_t args[MAX_OPT_ARGS];
1131 rpc_authflavor_t pseudoflavor;
1132 char *p;
1133
1134 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1135
1136 while ((p = strsep(&value, ":")) != NULL) {
1137 switch (match_token(p, nfs_secflavor_tokens, args)) {
1138 case Opt_sec_none:
1139 pseudoflavor = RPC_AUTH_NULL;
1140 break;
1141 case Opt_sec_sys:
1142 pseudoflavor = RPC_AUTH_UNIX;
1143 break;
1144 case Opt_sec_krb5:
1145 pseudoflavor = RPC_AUTH_GSS_KRB5;
1146 break;
1147 case Opt_sec_krb5i:
1148 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1149 break;
1150 case Opt_sec_krb5p:
1151 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1152 break;
1153 case Opt_sec_lkey:
1154 pseudoflavor = RPC_AUTH_GSS_LKEY;
1155 break;
1156 case Opt_sec_lkeyi:
1157 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1158 break;
1159 case Opt_sec_lkeyp:
1160 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1161 break;
1162 case Opt_sec_spkm:
1163 pseudoflavor = RPC_AUTH_GSS_SPKM;
1164 break;
1165 case Opt_sec_spkmi:
1166 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1167 break;
1168 case Opt_sec_spkmp:
1169 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1170 break;
1171 default:
1172 dfprintk(MOUNT,
1173 "NFS: sec= option '%s' not recognized\n", p);
1174 return 0;
1175 }
1176
1177 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1178 return 0;
1179 }
1180
1181 return 1;
1182 }
1183
nfs_parse_version_string(char * string,struct nfs_parsed_mount_data * mnt,substring_t * args)1184 static int nfs_parse_version_string(char *string,
1185 struct nfs_parsed_mount_data *mnt,
1186 substring_t *args)
1187 {
1188 mnt->flags &= ~NFS_MOUNT_VER3;
1189 switch (match_token(string, nfs_vers_tokens, args)) {
1190 case Opt_vers_2:
1191 mnt->version = 2;
1192 break;
1193 case Opt_vers_3:
1194 mnt->flags |= NFS_MOUNT_VER3;
1195 mnt->version = 3;
1196 break;
1197 case Opt_vers_4:
1198 /* Backward compatibility option. In future,
1199 * the mount program should always supply
1200 * a NFSv4 minor version number.
1201 */
1202 mnt->version = 4;
1203 break;
1204 case Opt_vers_4_0:
1205 mnt->version = 4;
1206 mnt->minorversion = 0;
1207 break;
1208 case Opt_vers_4_1:
1209 mnt->version = 4;
1210 mnt->minorversion = 1;
1211 break;
1212 case Opt_vers_4_2:
1213 mnt->version = 4;
1214 mnt->minorversion = 2;
1215 break;
1216 default:
1217 return 0;
1218 }
1219 return 1;
1220 }
1221
nfs_get_option_str(substring_t args[],char ** option)1222 static int nfs_get_option_str(substring_t args[], char **option)
1223 {
1224 kfree(*option);
1225 *option = match_strdup(args);
1226 return !*option;
1227 }
1228
nfs_get_option_ul(substring_t args[],unsigned long * option)1229 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1230 {
1231 int rc;
1232 char *string;
1233
1234 string = match_strdup(args);
1235 if (string == NULL)
1236 return -ENOMEM;
1237 rc = kstrtoul(string, 10, option);
1238 kfree(string);
1239
1240 return rc;
1241 }
1242
nfs_get_option_ul_bound(substring_t args[],unsigned long * option,unsigned long l_bound,unsigned long u_bound)1243 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
1244 unsigned long l_bound, unsigned long u_bound)
1245 {
1246 int ret;
1247
1248 ret = nfs_get_option_ul(args, option);
1249 if (ret != 0)
1250 return ret;
1251 if (*option < l_bound || *option > u_bound)
1252 return -ERANGE;
1253 return 0;
1254 }
1255
1256 /*
1257 * Error-check and convert a string of mount options from user space into
1258 * a data structure. The whole mount string is processed; bad options are
1259 * skipped as they are encountered. If there were no errors, return 1;
1260 * otherwise return 0 (zero).
1261 */
nfs_parse_mount_options(char * raw,struct nfs_parsed_mount_data * mnt)1262 static int nfs_parse_mount_options(char *raw,
1263 struct nfs_parsed_mount_data *mnt)
1264 {
1265 char *p, *string;
1266 int rc, sloppy = 0, invalid_option = 0;
1267 unsigned short protofamily = AF_UNSPEC;
1268 unsigned short mountfamily = AF_UNSPEC;
1269
1270 if (!raw) {
1271 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1272 return 1;
1273 }
1274 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1275
1276 rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
1277 if (rc)
1278 goto out_security_failure;
1279
1280 while ((p = strsep(&raw, ",")) != NULL) {
1281 substring_t args[MAX_OPT_ARGS];
1282 unsigned long option;
1283 int token;
1284
1285 if (!*p)
1286 continue;
1287
1288 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1289
1290 token = match_token(p, nfs_mount_option_tokens, args);
1291 switch (token) {
1292
1293 /*
1294 * boolean options: foo/nofoo
1295 */
1296 case Opt_soft:
1297 mnt->flags |= NFS_MOUNT_SOFT;
1298 mnt->flags &= ~NFS_MOUNT_SOFTERR;
1299 break;
1300 case Opt_softerr:
1301 mnt->flags |= NFS_MOUNT_SOFTERR;
1302 mnt->flags &= ~NFS_MOUNT_SOFT;
1303 break;
1304 case Opt_hard:
1305 mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
1306 break;
1307 case Opt_posix:
1308 mnt->flags |= NFS_MOUNT_POSIX;
1309 break;
1310 case Opt_noposix:
1311 mnt->flags &= ~NFS_MOUNT_POSIX;
1312 break;
1313 case Opt_cto:
1314 mnt->flags &= ~NFS_MOUNT_NOCTO;
1315 break;
1316 case Opt_nocto:
1317 mnt->flags |= NFS_MOUNT_NOCTO;
1318 break;
1319 case Opt_ac:
1320 mnt->flags &= ~NFS_MOUNT_NOAC;
1321 break;
1322 case Opt_noac:
1323 mnt->flags |= NFS_MOUNT_NOAC;
1324 break;
1325 case Opt_lock:
1326 mnt->flags &= ~NFS_MOUNT_NONLM;
1327 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1328 NFS_MOUNT_LOCAL_FCNTL);
1329 break;
1330 case Opt_nolock:
1331 mnt->flags |= NFS_MOUNT_NONLM;
1332 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1333 NFS_MOUNT_LOCAL_FCNTL);
1334 break;
1335 case Opt_udp:
1336 mnt->flags &= ~NFS_MOUNT_TCP;
1337 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1338 break;
1339 case Opt_tcp:
1340 mnt->flags |= NFS_MOUNT_TCP;
1341 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1342 break;
1343 case Opt_rdma:
1344 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1345 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1346 xprt_load_transport(p);
1347 break;
1348 case Opt_acl:
1349 mnt->flags &= ~NFS_MOUNT_NOACL;
1350 break;
1351 case Opt_noacl:
1352 mnt->flags |= NFS_MOUNT_NOACL;
1353 break;
1354 case Opt_rdirplus:
1355 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1356 break;
1357 case Opt_nordirplus:
1358 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1359 break;
1360 case Opt_sharecache:
1361 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1362 break;
1363 case Opt_nosharecache:
1364 mnt->flags |= NFS_MOUNT_UNSHARED;
1365 break;
1366 case Opt_resvport:
1367 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1368 break;
1369 case Opt_noresvport:
1370 mnt->flags |= NFS_MOUNT_NORESVPORT;
1371 break;
1372 case Opt_fscache:
1373 mnt->options |= NFS_OPTION_FSCACHE;
1374 kfree(mnt->fscache_uniq);
1375 mnt->fscache_uniq = NULL;
1376 break;
1377 case Opt_nofscache:
1378 mnt->options &= ~NFS_OPTION_FSCACHE;
1379 kfree(mnt->fscache_uniq);
1380 mnt->fscache_uniq = NULL;
1381 break;
1382 case Opt_migration:
1383 mnt->options |= NFS_OPTION_MIGRATION;
1384 break;
1385 case Opt_nomigration:
1386 mnt->options &= ~NFS_OPTION_MIGRATION;
1387 break;
1388
1389 /*
1390 * options that take numeric values
1391 */
1392 case Opt_port:
1393 if (nfs_get_option_ul(args, &option) ||
1394 option > USHRT_MAX)
1395 goto out_invalid_value;
1396 mnt->nfs_server.port = option;
1397 break;
1398 case Opt_rsize:
1399 if (nfs_get_option_ul(args, &option))
1400 goto out_invalid_value;
1401 mnt->rsize = option;
1402 break;
1403 case Opt_wsize:
1404 if (nfs_get_option_ul(args, &option))
1405 goto out_invalid_value;
1406 mnt->wsize = option;
1407 break;
1408 case Opt_bsize:
1409 if (nfs_get_option_ul(args, &option))
1410 goto out_invalid_value;
1411 mnt->bsize = option;
1412 break;
1413 case Opt_timeo:
1414 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
1415 goto out_invalid_value;
1416 mnt->timeo = option;
1417 break;
1418 case Opt_retrans:
1419 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
1420 goto out_invalid_value;
1421 mnt->retrans = option;
1422 break;
1423 case Opt_acregmin:
1424 if (nfs_get_option_ul(args, &option))
1425 goto out_invalid_value;
1426 mnt->acregmin = option;
1427 break;
1428 case Opt_acregmax:
1429 if (nfs_get_option_ul(args, &option))
1430 goto out_invalid_value;
1431 mnt->acregmax = option;
1432 break;
1433 case Opt_acdirmin:
1434 if (nfs_get_option_ul(args, &option))
1435 goto out_invalid_value;
1436 mnt->acdirmin = option;
1437 break;
1438 case Opt_acdirmax:
1439 if (nfs_get_option_ul(args, &option))
1440 goto out_invalid_value;
1441 mnt->acdirmax = option;
1442 break;
1443 case Opt_actimeo:
1444 if (nfs_get_option_ul(args, &option))
1445 goto out_invalid_value;
1446 mnt->acregmin = mnt->acregmax =
1447 mnt->acdirmin = mnt->acdirmax = option;
1448 break;
1449 case Opt_namelen:
1450 if (nfs_get_option_ul(args, &option))
1451 goto out_invalid_value;
1452 mnt->namlen = option;
1453 break;
1454 case Opt_mountport:
1455 if (nfs_get_option_ul(args, &option) ||
1456 option > USHRT_MAX)
1457 goto out_invalid_value;
1458 mnt->mount_server.port = option;
1459 break;
1460 case Opt_mountvers:
1461 if (nfs_get_option_ul(args, &option) ||
1462 option < NFS_MNT_VERSION ||
1463 option > NFS_MNT3_VERSION)
1464 goto out_invalid_value;
1465 mnt->mount_server.version = option;
1466 break;
1467 case Opt_minorversion:
1468 if (nfs_get_option_ul(args, &option))
1469 goto out_invalid_value;
1470 if (option > NFS4_MAX_MINOR_VERSION)
1471 goto out_invalid_value;
1472 mnt->minorversion = option;
1473 break;
1474
1475 /*
1476 * options that take text values
1477 */
1478 case Opt_nfsvers:
1479 string = match_strdup(args);
1480 if (string == NULL)
1481 goto out_nomem;
1482 rc = nfs_parse_version_string(string, mnt, args);
1483 kfree(string);
1484 if (!rc)
1485 goto out_invalid_value;
1486 break;
1487 case Opt_sec:
1488 string = match_strdup(args);
1489 if (string == NULL)
1490 goto out_nomem;
1491 rc = nfs_parse_security_flavors(string, mnt);
1492 kfree(string);
1493 if (!rc) {
1494 dfprintk(MOUNT, "NFS: unrecognized "
1495 "security flavor\n");
1496 return 0;
1497 }
1498 break;
1499 case Opt_proto:
1500 string = match_strdup(args);
1501 if (string == NULL)
1502 goto out_nomem;
1503 token = match_token(string,
1504 nfs_xprt_protocol_tokens, args);
1505
1506 protofamily = AF_INET;
1507 switch (token) {
1508 case Opt_xprt_udp6:
1509 protofamily = AF_INET6;
1510 /* fall through */
1511 case Opt_xprt_udp:
1512 mnt->flags &= ~NFS_MOUNT_TCP;
1513 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1514 break;
1515 case Opt_xprt_tcp6:
1516 protofamily = AF_INET6;
1517 /* fall through */
1518 case Opt_xprt_tcp:
1519 mnt->flags |= NFS_MOUNT_TCP;
1520 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1521 break;
1522 case Opt_xprt_rdma6:
1523 protofamily = AF_INET6;
1524 /* fall through */
1525 case Opt_xprt_rdma:
1526 /* vector side protocols to TCP */
1527 mnt->flags |= NFS_MOUNT_TCP;
1528 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1529 xprt_load_transport(string);
1530 break;
1531 default:
1532 dfprintk(MOUNT, "NFS: unrecognized "
1533 "transport protocol\n");
1534 kfree(string);
1535 return 0;
1536 }
1537 kfree(string);
1538 break;
1539 case Opt_mountproto:
1540 string = match_strdup(args);
1541 if (string == NULL)
1542 goto out_nomem;
1543 token = match_token(string,
1544 nfs_xprt_protocol_tokens, args);
1545 kfree(string);
1546
1547 mountfamily = AF_INET;
1548 switch (token) {
1549 case Opt_xprt_udp6:
1550 mountfamily = AF_INET6;
1551 /* fall through */
1552 case Opt_xprt_udp:
1553 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1554 break;
1555 case Opt_xprt_tcp6:
1556 mountfamily = AF_INET6;
1557 /* fall through */
1558 case Opt_xprt_tcp:
1559 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1560 break;
1561 case Opt_xprt_rdma: /* not used for side protocols */
1562 default:
1563 dfprintk(MOUNT, "NFS: unrecognized "
1564 "transport protocol\n");
1565 return 0;
1566 }
1567 break;
1568 case Opt_addr:
1569 string = match_strdup(args);
1570 if (string == NULL)
1571 goto out_nomem;
1572 mnt->nfs_server.addrlen =
1573 rpc_pton(mnt->net, string, strlen(string),
1574 (struct sockaddr *)
1575 &mnt->nfs_server.address,
1576 sizeof(mnt->nfs_server.address));
1577 kfree(string);
1578 if (mnt->nfs_server.addrlen == 0)
1579 goto out_invalid_address;
1580 break;
1581 case Opt_clientaddr:
1582 if (nfs_get_option_str(args, &mnt->client_address))
1583 goto out_nomem;
1584 break;
1585 case Opt_mounthost:
1586 if (nfs_get_option_str(args,
1587 &mnt->mount_server.hostname))
1588 goto out_nomem;
1589 break;
1590 case Opt_mountaddr:
1591 string = match_strdup(args);
1592 if (string == NULL)
1593 goto out_nomem;
1594 mnt->mount_server.addrlen =
1595 rpc_pton(mnt->net, string, strlen(string),
1596 (struct sockaddr *)
1597 &mnt->mount_server.address,
1598 sizeof(mnt->mount_server.address));
1599 kfree(string);
1600 if (mnt->mount_server.addrlen == 0)
1601 goto out_invalid_address;
1602 break;
1603 case Opt_nconnect:
1604 if (nfs_get_option_ul_bound(args, &option, 1, NFS_MAX_CONNECTIONS))
1605 goto out_invalid_value;
1606 mnt->nfs_server.nconnect = option;
1607 break;
1608 case Opt_lookupcache:
1609 string = match_strdup(args);
1610 if (string == NULL)
1611 goto out_nomem;
1612 token = match_token(string,
1613 nfs_lookupcache_tokens, args);
1614 kfree(string);
1615 switch (token) {
1616 case Opt_lookupcache_all:
1617 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1618 break;
1619 case Opt_lookupcache_positive:
1620 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1621 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1622 break;
1623 case Opt_lookupcache_none:
1624 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1625 break;
1626 default:
1627 dfprintk(MOUNT, "NFS: invalid "
1628 "lookupcache argument\n");
1629 return 0;
1630 };
1631 break;
1632 case Opt_fscache_uniq:
1633 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1634 goto out_nomem;
1635 mnt->options |= NFS_OPTION_FSCACHE;
1636 break;
1637 case Opt_local_lock:
1638 string = match_strdup(args);
1639 if (string == NULL)
1640 goto out_nomem;
1641 token = match_token(string, nfs_local_lock_tokens,
1642 args);
1643 kfree(string);
1644 switch (token) {
1645 case Opt_local_lock_all:
1646 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1647 NFS_MOUNT_LOCAL_FCNTL);
1648 break;
1649 case Opt_local_lock_flock:
1650 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1651 break;
1652 case Opt_local_lock_posix:
1653 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1654 break;
1655 case Opt_local_lock_none:
1656 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1657 NFS_MOUNT_LOCAL_FCNTL);
1658 break;
1659 default:
1660 dfprintk(MOUNT, "NFS: invalid "
1661 "local_lock argument\n");
1662 return 0;
1663 };
1664 break;
1665
1666 /*
1667 * Special options
1668 */
1669 case Opt_sloppy:
1670 sloppy = 1;
1671 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1672 break;
1673 case Opt_userspace:
1674 case Opt_deprecated:
1675 dfprintk(MOUNT, "NFS: ignoring mount option "
1676 "'%s'\n", p);
1677 break;
1678
1679 default:
1680 invalid_option = 1;
1681 dfprintk(MOUNT, "NFS: unrecognized mount option "
1682 "'%s'\n", p);
1683 }
1684 }
1685
1686 if (!sloppy && invalid_option)
1687 return 0;
1688
1689 if (mnt->minorversion && mnt->version != 4)
1690 goto out_minorversion_mismatch;
1691
1692 if (mnt->options & NFS_OPTION_MIGRATION &&
1693 (mnt->version != 4 || mnt->minorversion != 0))
1694 goto out_migration_misuse;
1695
1696 /*
1697 * verify that any proto=/mountproto= options match the address
1698 * families in the addr=/mountaddr= options.
1699 */
1700 if (protofamily != AF_UNSPEC &&
1701 protofamily != mnt->nfs_server.address.ss_family)
1702 goto out_proto_mismatch;
1703
1704 if (mountfamily != AF_UNSPEC) {
1705 if (mnt->mount_server.addrlen) {
1706 if (mountfamily != mnt->mount_server.address.ss_family)
1707 goto out_mountproto_mismatch;
1708 } else {
1709 if (mountfamily != mnt->nfs_server.address.ss_family)
1710 goto out_mountproto_mismatch;
1711 }
1712 }
1713
1714 return 1;
1715
1716 out_mountproto_mismatch:
1717 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1718 "option\n");
1719 return 0;
1720 out_proto_mismatch:
1721 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1722 return 0;
1723 out_invalid_address:
1724 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1725 return 0;
1726 out_invalid_value:
1727 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1728 return 0;
1729 out_minorversion_mismatch:
1730 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1731 "minorversion=%u\n", mnt->version, mnt->minorversion);
1732 return 0;
1733 out_migration_misuse:
1734 printk(KERN_INFO
1735 "NFS: 'migration' not supported for this NFS version\n");
1736 return 0;
1737 out_nomem:
1738 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1739 return 0;
1740 out_security_failure:
1741 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1742 return 0;
1743 }
1744
1745 /*
1746 * Ensure that a specified authtype in args->auth_info is supported by
1747 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1748 * -EACCES if not.
1749 */
nfs_verify_authflavors(struct nfs_parsed_mount_data * args,rpc_authflavor_t * server_authlist,unsigned int count)1750 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1751 rpc_authflavor_t *server_authlist, unsigned int count)
1752 {
1753 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1754 bool found_auth_null = false;
1755 unsigned int i;
1756
1757 /*
1758 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1759 * must be in the list returned by the server.
1760 *
1761 * AUTH_NULL has a special meaning when it's in the server list - it
1762 * means that the server will ignore the rpc creds, so any flavor
1763 * can be used but still use the sec= that was specified.
1764 *
1765 * Note also that the MNT procedure in MNTv1 does not return a list
1766 * of supported security flavors. In this case, nfs_mount() fabricates
1767 * a security flavor list containing just AUTH_NULL.
1768 */
1769 for (i = 0; i < count; i++) {
1770 flavor = server_authlist[i];
1771
1772 if (nfs_auth_info_match(&args->auth_info, flavor))
1773 goto out;
1774
1775 if (flavor == RPC_AUTH_NULL)
1776 found_auth_null = true;
1777 }
1778
1779 if (found_auth_null) {
1780 flavor = args->auth_info.flavors[0];
1781 goto out;
1782 }
1783
1784 dfprintk(MOUNT,
1785 "NFS: specified auth flavors not supported by server\n");
1786 return -EACCES;
1787
1788 out:
1789 args->selected_flavor = flavor;
1790 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1791 return 0;
1792 }
1793
1794 /*
1795 * Use the remote server's MOUNT service to request the NFS file handle
1796 * corresponding to the provided path.
1797 */
nfs_request_mount(struct nfs_parsed_mount_data * args,struct nfs_fh * root_fh,rpc_authflavor_t * server_authlist,unsigned int * server_authlist_len)1798 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1799 struct nfs_fh *root_fh,
1800 rpc_authflavor_t *server_authlist,
1801 unsigned int *server_authlist_len)
1802 {
1803 struct nfs_mount_request request = {
1804 .sap = (struct sockaddr *)
1805 &args->mount_server.address,
1806 .dirpath = args->nfs_server.export_path,
1807 .protocol = args->mount_server.protocol,
1808 .fh = root_fh,
1809 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1810 .auth_flav_len = server_authlist_len,
1811 .auth_flavs = server_authlist,
1812 .net = args->net,
1813 };
1814 int status;
1815
1816 if (args->mount_server.version == 0) {
1817 switch (args->version) {
1818 default:
1819 args->mount_server.version = NFS_MNT3_VERSION;
1820 break;
1821 case 2:
1822 args->mount_server.version = NFS_MNT_VERSION;
1823 }
1824 }
1825 request.version = args->mount_server.version;
1826
1827 if (args->mount_server.hostname)
1828 request.hostname = args->mount_server.hostname;
1829 else
1830 request.hostname = args->nfs_server.hostname;
1831
1832 /*
1833 * Construct the mount server's address.
1834 */
1835 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1836 memcpy(request.sap, &args->nfs_server.address,
1837 args->nfs_server.addrlen);
1838 args->mount_server.addrlen = args->nfs_server.addrlen;
1839 }
1840 request.salen = args->mount_server.addrlen;
1841 nfs_set_port(request.sap, &args->mount_server.port, 0);
1842
1843 /*
1844 * Now ask the mount server to map our export path
1845 * to a file handle.
1846 */
1847 status = nfs_mount(&request);
1848 if (status != 0) {
1849 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1850 request.hostname, status);
1851 return status;
1852 }
1853
1854 return 0;
1855 }
1856
nfs_try_mount_request(struct nfs_mount_info * mount_info,struct nfs_subversion * nfs_mod)1857 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1858 struct nfs_subversion *nfs_mod)
1859 {
1860 int status;
1861 unsigned int i;
1862 bool tried_auth_unix = false;
1863 bool auth_null_in_list = false;
1864 struct nfs_server *server = ERR_PTR(-EACCES);
1865 struct nfs_parsed_mount_data *args = mount_info->parsed;
1866 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1867 unsigned int authlist_len = ARRAY_SIZE(authlist);
1868
1869 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1870 &authlist_len);
1871 if (status)
1872 return ERR_PTR(status);
1873
1874 /*
1875 * Was a sec= authflavor specified in the options? First, verify
1876 * whether the server supports it, and then just try to use it if so.
1877 */
1878 if (args->auth_info.flavor_len > 0) {
1879 status = nfs_verify_authflavors(args, authlist, authlist_len);
1880 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1881 args->selected_flavor);
1882 if (status)
1883 return ERR_PTR(status);
1884 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1885 }
1886
1887 /*
1888 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1889 * SHOULD prefer the flavor listed first. However, some servers list
1890 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1891 */
1892 for (i = 0; i < authlist_len; ++i) {
1893 rpc_authflavor_t flavor;
1894 struct rpcsec_gss_info info;
1895
1896 flavor = authlist[i];
1897 switch (flavor) {
1898 case RPC_AUTH_UNIX:
1899 tried_auth_unix = true;
1900 break;
1901 case RPC_AUTH_NULL:
1902 auth_null_in_list = true;
1903 continue;
1904 default:
1905 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1906 continue;
1907 /* Fallthrough */
1908 }
1909 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1910 args->selected_flavor = flavor;
1911 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1912 if (!IS_ERR(server))
1913 return server;
1914 }
1915
1916 /*
1917 * Nothing we tried so far worked. At this point, give up if we've
1918 * already tried AUTH_UNIX or if the server's list doesn't contain
1919 * AUTH_NULL
1920 */
1921 if (tried_auth_unix || !auth_null_in_list)
1922 return server;
1923
1924 /* Last chance! Try AUTH_UNIX */
1925 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1926 args->selected_flavor = RPC_AUTH_UNIX;
1927 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1928 }
1929
nfs_try_mount(int flags,const char * dev_name,struct nfs_mount_info * mount_info,struct nfs_subversion * nfs_mod)1930 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1931 struct nfs_mount_info *mount_info,
1932 struct nfs_subversion *nfs_mod)
1933 {
1934 struct nfs_server *server;
1935
1936 if (mount_info->parsed->need_mount)
1937 server = nfs_try_mount_request(mount_info, nfs_mod);
1938 else
1939 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1940
1941 if (IS_ERR(server))
1942 return ERR_CAST(server);
1943
1944 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1945 }
1946 EXPORT_SYMBOL_GPL(nfs_try_mount);
1947
1948 /*
1949 * Split "dev_name" into "hostname:export_path".
1950 *
1951 * The leftmost colon demarks the split between the server's hostname
1952 * and the export path. If the hostname starts with a left square
1953 * bracket, then it may contain colons.
1954 *
1955 * Note: caller frees hostname and export path, even on error.
1956 */
nfs_parse_devname(const char * dev_name,char ** hostname,size_t maxnamlen,char ** export_path,size_t maxpathlen)1957 static int nfs_parse_devname(const char *dev_name,
1958 char **hostname, size_t maxnamlen,
1959 char **export_path, size_t maxpathlen)
1960 {
1961 size_t len;
1962 char *end;
1963
1964 if (unlikely(!dev_name || !*dev_name)) {
1965 dfprintk(MOUNT, "NFS: device name not specified\n");
1966 return -EINVAL;
1967 }
1968
1969 /* Is the host name protected with square brakcets? */
1970 if (*dev_name == '[') {
1971 end = strchr(++dev_name, ']');
1972 if (end == NULL || end[1] != ':')
1973 goto out_bad_devname;
1974
1975 len = end - dev_name;
1976 end++;
1977 } else {
1978 char *comma;
1979
1980 end = strchr(dev_name, ':');
1981 if (end == NULL)
1982 goto out_bad_devname;
1983 len = end - dev_name;
1984
1985 /* kill possible hostname list: not supported */
1986 comma = strchr(dev_name, ',');
1987 if (comma != NULL && comma < end)
1988 len = comma - dev_name;
1989 }
1990
1991 if (len > maxnamlen)
1992 goto out_hostname;
1993
1994 /* N.B. caller will free nfs_server.hostname in all cases */
1995 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1996 if (*hostname == NULL)
1997 goto out_nomem;
1998 len = strlen(++end);
1999 if (len > maxpathlen)
2000 goto out_path;
2001 *export_path = kstrndup(end, len, GFP_KERNEL);
2002 if (!*export_path)
2003 goto out_nomem;
2004
2005 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
2006 return 0;
2007
2008 out_bad_devname:
2009 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
2010 return -EINVAL;
2011
2012 out_nomem:
2013 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
2014 return -ENOMEM;
2015
2016 out_hostname:
2017 dfprintk(MOUNT, "NFS: server hostname too long\n");
2018 return -ENAMETOOLONG;
2019
2020 out_path:
2021 dfprintk(MOUNT, "NFS: export pathname too long\n");
2022 return -ENAMETOOLONG;
2023 }
2024
2025 /*
2026 * Validate the NFS2/NFS3 mount data
2027 * - fills in the mount root filehandle
2028 *
2029 * For option strings, user space handles the following behaviors:
2030 *
2031 * + DNS: mapping server host name to IP address ("addr=" option)
2032 *
2033 * + failure mode: how to behave if a mount request can't be handled
2034 * immediately ("fg/bg" option)
2035 *
2036 * + retry: how often to retry a mount request ("retry=" option)
2037 *
2038 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
2039 * mountproto=tcp after mountproto=udp, and so on
2040 */
nfs23_validate_mount_data(void * options,struct nfs_parsed_mount_data * args,struct nfs_fh * mntfh,const char * dev_name)2041 static int nfs23_validate_mount_data(void *options,
2042 struct nfs_parsed_mount_data *args,
2043 struct nfs_fh *mntfh,
2044 const char *dev_name)
2045 {
2046 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
2047 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2048 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
2049
2050 if (data == NULL)
2051 goto out_no_data;
2052
2053 args->version = NFS_DEFAULT_VERSION;
2054 switch (data->version) {
2055 case 1:
2056 data->namlen = 0; /* fall through */
2057 case 2:
2058 data->bsize = 0; /* fall through */
2059 case 3:
2060 if (data->flags & NFS_MOUNT_VER3)
2061 goto out_no_v3;
2062 data->root.size = NFS2_FHSIZE;
2063 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
2064 /* Turn off security negotiation */
2065 extra_flags |= NFS_MOUNT_SECFLAVOUR;
2066 /* fall through */
2067 case 4:
2068 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2069 goto out_no_sec;
2070 /* fall through */
2071 case 5:
2072 memset(data->context, 0, sizeof(data->context));
2073 /* fall through */
2074 case 6:
2075 if (data->flags & NFS_MOUNT_VER3) {
2076 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
2077 goto out_invalid_fh;
2078 mntfh->size = data->root.size;
2079 args->version = 3;
2080 } else {
2081 mntfh->size = NFS2_FHSIZE;
2082 args->version = 2;
2083 }
2084
2085
2086 memcpy(mntfh->data, data->root.data, mntfh->size);
2087 if (mntfh->size < sizeof(mntfh->data))
2088 memset(mntfh->data + mntfh->size, 0,
2089 sizeof(mntfh->data) - mntfh->size);
2090
2091 /*
2092 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2093 * can deal with.
2094 */
2095 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2096 args->flags |= extra_flags;
2097 args->rsize = data->rsize;
2098 args->wsize = data->wsize;
2099 args->timeo = data->timeo;
2100 args->retrans = data->retrans;
2101 args->acregmin = data->acregmin;
2102 args->acregmax = data->acregmax;
2103 args->acdirmin = data->acdirmin;
2104 args->acdirmax = data->acdirmax;
2105 args->need_mount = false;
2106
2107 memcpy(sap, &data->addr, sizeof(data->addr));
2108 args->nfs_server.addrlen = sizeof(data->addr);
2109 args->nfs_server.port = ntohs(data->addr.sin_port);
2110 if (sap->sa_family != AF_INET ||
2111 !nfs_verify_server_address(sap))
2112 goto out_no_address;
2113
2114 if (!(data->flags & NFS_MOUNT_TCP))
2115 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2116 /* N.B. caller will free nfs_server.hostname in all cases */
2117 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2118 args->namlen = data->namlen;
2119 args->bsize = data->bsize;
2120
2121 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2122 args->selected_flavor = data->pseudoflavor;
2123 else
2124 args->selected_flavor = RPC_AUTH_UNIX;
2125 if (!args->nfs_server.hostname)
2126 goto out_nomem;
2127
2128 if (!(data->flags & NFS_MOUNT_NONLM))
2129 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2130 NFS_MOUNT_LOCAL_FCNTL);
2131 else
2132 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2133 NFS_MOUNT_LOCAL_FCNTL);
2134 /*
2135 * The legacy version 6 binary mount data from userspace has a
2136 * field used only to transport selinux information into the
2137 * the kernel. To continue to support that functionality we
2138 * have a touch of selinux knowledge here in the NFS code. The
2139 * userspace code converted context=blah to just blah so we are
2140 * converting back to the full string selinux understands.
2141 */
2142 if (data->context[0]){
2143 #ifdef CONFIG_SECURITY_SELINUX
2144 int rc;
2145 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2146 rc = security_add_mnt_opt("context", data->context,
2147 strlen(data->context), &args->lsm_opts);
2148 if (rc)
2149 return rc;
2150 #else
2151 return -EINVAL;
2152 #endif
2153 }
2154
2155 break;
2156 default:
2157 return NFS_TEXT_DATA;
2158 }
2159
2160 return 0;
2161
2162 out_no_data:
2163 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2164 return -EINVAL;
2165
2166 out_no_v3:
2167 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2168 data->version);
2169 return -EINVAL;
2170
2171 out_no_sec:
2172 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2173 return -EINVAL;
2174
2175 out_nomem:
2176 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2177 return -ENOMEM;
2178
2179 out_no_address:
2180 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2181 return -EINVAL;
2182
2183 out_invalid_fh:
2184 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2185 return -EINVAL;
2186 }
2187
2188 #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)2189 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2190 void *options,
2191 struct nfs_parsed_mount_data *args,
2192 struct nfs_fh *mntfh,
2193 const char *dev_name)
2194 {
2195 if (fs_type == &nfs_fs_type)
2196 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2197 return nfs4_validate_mount_data(options, args, dev_name);
2198 }
2199 #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)2200 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2201 void *options,
2202 struct nfs_parsed_mount_data *args,
2203 struct nfs_fh *mntfh,
2204 const char *dev_name)
2205 {
2206 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2207 }
2208 #endif
2209
nfs_validate_text_mount_data(void * options,struct nfs_parsed_mount_data * args,const char * dev_name)2210 static int nfs_validate_text_mount_data(void *options,
2211 struct nfs_parsed_mount_data *args,
2212 const char *dev_name)
2213 {
2214 int port = 0;
2215 int max_namelen = PAGE_SIZE;
2216 int max_pathlen = NFS_MAXPATHLEN;
2217 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2218
2219 if (nfs_parse_mount_options((char *)options, args) == 0)
2220 return -EINVAL;
2221
2222 if (!nfs_verify_server_address(sap))
2223 goto out_no_address;
2224
2225 if (args->version == 4) {
2226 #if IS_ENABLED(CONFIG_NFS_V4)
2227 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
2228 port = NFS_RDMA_PORT;
2229 else
2230 port = NFS_PORT;
2231 max_namelen = NFS4_MAXNAMLEN;
2232 max_pathlen = NFS4_MAXPATHLEN;
2233 nfs_validate_transport_protocol(args);
2234 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2235 goto out_invalid_transport_udp;
2236 nfs4_validate_mount_flags(args);
2237 #else
2238 goto out_v4_not_compiled;
2239 #endif /* CONFIG_NFS_V4 */
2240 } else {
2241 nfs_set_mount_transport_protocol(args);
2242 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
2243 port = NFS_RDMA_PORT;
2244 }
2245
2246 nfs_set_port(sap, &args->nfs_server.port, port);
2247
2248 return nfs_parse_devname(dev_name,
2249 &args->nfs_server.hostname,
2250 max_namelen,
2251 &args->nfs_server.export_path,
2252 max_pathlen);
2253
2254 #if !IS_ENABLED(CONFIG_NFS_V4)
2255 out_v4_not_compiled:
2256 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2257 return -EPROTONOSUPPORT;
2258 #else
2259 out_invalid_transport_udp:
2260 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2261 return -EINVAL;
2262 #endif /* !CONFIG_NFS_V4 */
2263
2264 out_no_address:
2265 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2266 return -EINVAL;
2267 }
2268
2269 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2270 | NFS_MOUNT_SECURE \
2271 | NFS_MOUNT_TCP \
2272 | NFS_MOUNT_VER3 \
2273 | NFS_MOUNT_KERBEROS \
2274 | NFS_MOUNT_NONLM \
2275 | NFS_MOUNT_BROKEN_SUID \
2276 | NFS_MOUNT_STRICTLOCK \
2277 | NFS_MOUNT_LEGACY_INTERFACE)
2278
2279 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2280 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2281
2282 static int
nfs_compare_remount_data(struct nfs_server * nfss,struct nfs_parsed_mount_data * data)2283 nfs_compare_remount_data(struct nfs_server *nfss,
2284 struct nfs_parsed_mount_data *data)
2285 {
2286 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2287 data->rsize != nfss->rsize ||
2288 data->wsize != nfss->wsize ||
2289 data->version != nfss->nfs_client->rpc_ops->version ||
2290 data->minorversion != nfss->nfs_client->cl_minorversion ||
2291 data->retrans != nfss->client->cl_timeout->to_retries ||
2292 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2293 data->acregmin != nfss->acregmin / HZ ||
2294 data->acregmax != nfss->acregmax / HZ ||
2295 data->acdirmin != nfss->acdirmin / HZ ||
2296 data->acdirmax != nfss->acdirmax / HZ ||
2297 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2298 (data->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) ||
2299 data->nfs_server.port != nfss->port ||
2300 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2301 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2302 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2303 return -EINVAL;
2304
2305 return 0;
2306 }
2307
2308 int
nfs_remount(struct super_block * sb,int * flags,char * raw_data)2309 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2310 {
2311 int error;
2312 struct nfs_server *nfss = sb->s_fs_info;
2313 struct nfs_parsed_mount_data *data;
2314 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2315 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2316 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2317
2318 sync_filesystem(sb);
2319
2320 /*
2321 * Userspace mount programs that send binary options generally send
2322 * them populated with default values. We have no way to know which
2323 * ones were explicitly specified. Fall back to legacy behavior and
2324 * just return success.
2325 */
2326 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2327 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2328 options->version <= 6))))
2329 return 0;
2330
2331 data = nfs_alloc_parsed_mount_data();
2332 if (data == NULL)
2333 return -ENOMEM;
2334
2335 /* fill out struct with values from existing mount */
2336 data->flags = nfss->flags;
2337 data->rsize = nfss->rsize;
2338 data->wsize = nfss->wsize;
2339 data->retrans = nfss->client->cl_timeout->to_retries;
2340 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2341 data->acregmin = nfss->acregmin / HZ;
2342 data->acregmax = nfss->acregmax / HZ;
2343 data->acdirmin = nfss->acdirmin / HZ;
2344 data->acdirmax = nfss->acdirmax / HZ;
2345 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2346 data->nfs_server.port = nfss->port;
2347 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2348 data->version = nfsvers;
2349 data->minorversion = nfss->nfs_client->cl_minorversion;
2350 data->net = current->nsproxy->net_ns;
2351 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2352 data->nfs_server.addrlen);
2353
2354 /* overwrite those values with any that were specified */
2355 error = -EINVAL;
2356 if (!nfs_parse_mount_options((char *)options, data))
2357 goto out;
2358
2359 /*
2360 * noac is a special case. It implies -o sync, but that's not
2361 * necessarily reflected in the mtab options. do_remount_sb
2362 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
2363 * remount options, so we have to explicitly reset it.
2364 */
2365 if (data->flags & NFS_MOUNT_NOAC)
2366 *flags |= SB_SYNCHRONOUS;
2367
2368 /* compare new mount options with old ones */
2369 error = nfs_compare_remount_data(nfss, data);
2370 if (!error)
2371 error = security_sb_remount(sb, data->lsm_opts);
2372 out:
2373 nfs_free_parsed_mount_data(data);
2374 return error;
2375 }
2376 EXPORT_SYMBOL_GPL(nfs_remount);
2377
2378 /*
2379 * Initialise the common bits of the superblock
2380 */
nfs_initialise_sb(struct super_block * sb)2381 static void nfs_initialise_sb(struct super_block *sb)
2382 {
2383 struct nfs_server *server = NFS_SB(sb);
2384
2385 sb->s_magic = NFS_SUPER_MAGIC;
2386
2387 /* We probably want something more informative here */
2388 snprintf(sb->s_id, sizeof(sb->s_id),
2389 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2390
2391 if (sb->s_blocksize == 0)
2392 sb->s_blocksize = nfs_block_bits(server->wsize,
2393 &sb->s_blocksize_bits);
2394
2395 nfs_super_set_maxbytes(sb, server->maxfilesize);
2396 }
2397
2398 /*
2399 * Finish setting up an NFS2/3 superblock
2400 */
nfs_fill_super(struct super_block * sb,struct nfs_mount_info * mount_info)2401 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2402 {
2403 struct nfs_parsed_mount_data *data = mount_info->parsed;
2404 struct nfs_server *server = NFS_SB(sb);
2405
2406 sb->s_blocksize_bits = 0;
2407 sb->s_blocksize = 0;
2408 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2409 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2410 if (data && data->bsize)
2411 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2412
2413 switch (server->nfs_client->rpc_ops->version) {
2414 case 2:
2415 sb->s_time_gran = 1000;
2416 sb->s_time_min = 0;
2417 sb->s_time_max = U32_MAX;
2418 break;
2419 case 3:
2420 /*
2421 * The VFS shouldn't apply the umask to mode bits.
2422 * We will do so ourselves when necessary.
2423 */
2424 sb->s_flags |= SB_POSIXACL;
2425 sb->s_time_gran = 1;
2426 sb->s_time_min = 0;
2427 sb->s_time_max = U32_MAX;
2428 sb->s_export_op = &nfs_export_ops;
2429 break;
2430 case 4:
2431 sb->s_flags |= SB_POSIXACL;
2432 sb->s_time_gran = 1;
2433 sb->s_time_min = S64_MIN;
2434 sb->s_time_max = S64_MAX;
2435 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
2436 sb->s_export_op = &nfs_export_ops;
2437 break;
2438 }
2439
2440 nfs_initialise_sb(sb);
2441 }
2442 EXPORT_SYMBOL_GPL(nfs_fill_super);
2443
2444 /*
2445 * Finish setting up a cloned NFS2/3/4 superblock
2446 */
nfs_clone_super(struct super_block * sb,struct nfs_mount_info * mount_info)2447 static void nfs_clone_super(struct super_block *sb,
2448 struct nfs_mount_info *mount_info)
2449 {
2450 const struct super_block *old_sb = mount_info->cloned->sb;
2451 struct nfs_server *server = NFS_SB(sb);
2452
2453 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2454 sb->s_blocksize = old_sb->s_blocksize;
2455 sb->s_maxbytes = old_sb->s_maxbytes;
2456 sb->s_xattr = old_sb->s_xattr;
2457 sb->s_op = old_sb->s_op;
2458 sb->s_export_op = old_sb->s_export_op;
2459
2460 if (server->nfs_client->rpc_ops->version != 2) {
2461 /* The VFS shouldn't apply the umask to mode bits. We will do
2462 * so ourselves when necessary.
2463 */
2464 sb->s_flags |= SB_POSIXACL;
2465 sb->s_time_gran = 1;
2466 } else
2467 sb->s_time_gran = 1000;
2468
2469 if (server->nfs_client->rpc_ops->version != 4) {
2470 sb->s_time_min = 0;
2471 sb->s_time_max = U32_MAX;
2472 } else {
2473 sb->s_time_min = S64_MIN;
2474 sb->s_time_max = S64_MAX;
2475 }
2476
2477 nfs_initialise_sb(sb);
2478 }
2479
nfs_compare_mount_options(const struct super_block * s,const struct nfs_server * b,int flags)2480 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2481 {
2482 const struct nfs_server *a = s->s_fs_info;
2483 const struct rpc_clnt *clnt_a = a->client;
2484 const struct rpc_clnt *clnt_b = b->client;
2485
2486 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2487 goto Ebusy;
2488 if (a->nfs_client != b->nfs_client)
2489 goto Ebusy;
2490 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2491 goto Ebusy;
2492 if (a->wsize != b->wsize)
2493 goto Ebusy;
2494 if (a->rsize != b->rsize)
2495 goto Ebusy;
2496 if (a->acregmin != b->acregmin)
2497 goto Ebusy;
2498 if (a->acregmax != b->acregmax)
2499 goto Ebusy;
2500 if (a->acdirmin != b->acdirmin)
2501 goto Ebusy;
2502 if (a->acdirmax != b->acdirmax)
2503 goto Ebusy;
2504 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2505 goto Ebusy;
2506 return 1;
2507 Ebusy:
2508 return 0;
2509 }
2510
2511 struct nfs_sb_mountdata {
2512 struct nfs_server *server;
2513 int mntflags;
2514 };
2515
nfs_set_super(struct super_block * s,void * data)2516 static int nfs_set_super(struct super_block *s, void *data)
2517 {
2518 struct nfs_sb_mountdata *sb_mntdata = data;
2519 struct nfs_server *server = sb_mntdata->server;
2520 int ret;
2521
2522 s->s_flags = sb_mntdata->mntflags;
2523 s->s_fs_info = server;
2524 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2525 ret = set_anon_super(s, server);
2526 if (ret == 0)
2527 server->s_dev = s->s_dev;
2528 return ret;
2529 }
2530
nfs_compare_super_address(struct nfs_server * server1,struct nfs_server * server2)2531 static int nfs_compare_super_address(struct nfs_server *server1,
2532 struct nfs_server *server2)
2533 {
2534 struct sockaddr *sap1, *sap2;
2535 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
2536 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
2537
2538 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
2539 return 0;
2540
2541 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2542 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2543
2544 if (sap1->sa_family != sap2->sa_family)
2545 return 0;
2546
2547 switch (sap1->sa_family) {
2548 case AF_INET: {
2549 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2550 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2551 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2552 return 0;
2553 if (sin1->sin_port != sin2->sin_port)
2554 return 0;
2555 break;
2556 }
2557 case AF_INET6: {
2558 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2559 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2560 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2561 return 0;
2562 if (sin1->sin6_port != sin2->sin6_port)
2563 return 0;
2564 break;
2565 }
2566 default:
2567 return 0;
2568 }
2569
2570 return 1;
2571 }
2572
nfs_compare_userns(const struct nfs_server * old,const struct nfs_server * new)2573 static int nfs_compare_userns(const struct nfs_server *old,
2574 const struct nfs_server *new)
2575 {
2576 const struct user_namespace *oldns = &init_user_ns;
2577 const struct user_namespace *newns = &init_user_ns;
2578
2579 if (old->client && old->client->cl_cred)
2580 oldns = old->client->cl_cred->user_ns;
2581 if (new->client && new->client->cl_cred)
2582 newns = new->client->cl_cred->user_ns;
2583 if (oldns != newns)
2584 return 0;
2585 return 1;
2586 }
2587
nfs_compare_super(struct super_block * sb,void * data)2588 static int nfs_compare_super(struct super_block *sb, void *data)
2589 {
2590 struct nfs_sb_mountdata *sb_mntdata = data;
2591 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2592 int mntflags = sb_mntdata->mntflags;
2593
2594 if (!nfs_compare_super_address(old, server))
2595 return 0;
2596 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2597 if (old->flags & NFS_MOUNT_UNSHARED)
2598 return 0;
2599 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2600 return 0;
2601 if (!nfs_compare_userns(old, server))
2602 return 0;
2603 return nfs_compare_mount_options(sb, server, mntflags);
2604 }
2605
2606 #ifdef CONFIG_NFS_FSCACHE
nfs_get_cache_cookie(struct super_block * sb,struct nfs_parsed_mount_data * parsed,struct nfs_clone_mount * cloned)2607 static void nfs_get_cache_cookie(struct super_block *sb,
2608 struct nfs_parsed_mount_data *parsed,
2609 struct nfs_clone_mount *cloned)
2610 {
2611 struct nfs_server *nfss = NFS_SB(sb);
2612 char *uniq = NULL;
2613 int ulen = 0;
2614
2615 nfss->fscache_key = NULL;
2616 nfss->fscache = NULL;
2617
2618 if (parsed) {
2619 if (!(parsed->options & NFS_OPTION_FSCACHE))
2620 return;
2621 if (parsed->fscache_uniq) {
2622 uniq = parsed->fscache_uniq;
2623 ulen = strlen(parsed->fscache_uniq);
2624 }
2625 } else if (cloned) {
2626 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2627 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2628 return;
2629 if (mnt_s->fscache_key) {
2630 uniq = mnt_s->fscache_key->key.uniquifier;
2631 ulen = mnt_s->fscache_key->key.uniq_len;
2632 };
2633 } else
2634 return;
2635
2636 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2637 }
2638 #else
nfs_get_cache_cookie(struct super_block * sb,struct nfs_parsed_mount_data * parsed,struct nfs_clone_mount * cloned)2639 static void nfs_get_cache_cookie(struct super_block *sb,
2640 struct nfs_parsed_mount_data *parsed,
2641 struct nfs_clone_mount *cloned)
2642 {
2643 }
2644 #endif
2645
nfs_set_sb_security(struct super_block * s,struct dentry * mntroot,struct nfs_mount_info * mount_info)2646 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2647 struct nfs_mount_info *mount_info)
2648 {
2649 int error;
2650 unsigned long kflags = 0, kflags_out = 0;
2651 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2652 kflags |= SECURITY_LSM_NATIVE_LABELS;
2653
2654 error = security_sb_set_mnt_opts(s, mount_info->parsed->lsm_opts,
2655 kflags, &kflags_out);
2656 if (error)
2657 goto err;
2658
2659 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2660 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2661 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2662 err:
2663 return error;
2664 }
2665 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2666
nfs_clone_sb_security(struct super_block * s,struct dentry * mntroot,struct nfs_mount_info * mount_info)2667 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2668 struct nfs_mount_info *mount_info)
2669 {
2670 int error;
2671 unsigned long kflags = 0, kflags_out = 0;
2672
2673 /* clone any lsm security options from the parent to the new sb */
2674 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2675 return -ESTALE;
2676
2677 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2678 kflags |= SECURITY_LSM_NATIVE_LABELS;
2679
2680 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags,
2681 &kflags_out);
2682 if (error)
2683 return error;
2684
2685 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2686 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2687 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2688 return 0;
2689 }
2690 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2691
nfs_set_readahead(struct backing_dev_info * bdi,unsigned long iomax_pages)2692 static void nfs_set_readahead(struct backing_dev_info *bdi,
2693 unsigned long iomax_pages)
2694 {
2695 bdi->ra_pages = VM_READAHEAD_PAGES;
2696 bdi->io_pages = iomax_pages;
2697 }
2698
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)2699 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2700 int flags, const char *dev_name,
2701 struct nfs_mount_info *mount_info,
2702 struct nfs_subversion *nfs_mod)
2703 {
2704 struct super_block *s;
2705 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2706 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2707 struct nfs_sb_mountdata sb_mntdata = {
2708 .mntflags = flags,
2709 .server = server,
2710 };
2711 int error;
2712
2713 if (server->flags & NFS_MOUNT_UNSHARED)
2714 compare_super = NULL;
2715
2716 /* -o noac implies -o sync */
2717 if (server->flags & NFS_MOUNT_NOAC)
2718 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2719
2720 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2721 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS)
2722 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2723
2724 /* Get a superblock - note that we may end up sharing one that already exists */
2725 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2726 if (IS_ERR(s)) {
2727 mntroot = ERR_CAST(s);
2728 goto out_err_nosb;
2729 }
2730
2731 if (s->s_fs_info != server) {
2732 nfs_free_server(server);
2733 server = NULL;
2734 } else {
2735 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
2736 MINOR(server->s_dev));
2737 if (error) {
2738 mntroot = ERR_PTR(error);
2739 goto error_splat_super;
2740 }
2741 nfs_set_readahead(s->s_bdi, server->rpages);
2742 server->super = s;
2743 }
2744
2745 if (!s->s_root) {
2746 /* initial superblock/root creation */
2747 mount_info->fill_super(s, mount_info);
2748 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2749 if (!(server->flags & NFS_MOUNT_UNSHARED))
2750 s->s_iflags |= SB_I_MULTIROOT;
2751 }
2752
2753 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2754 if (IS_ERR(mntroot))
2755 goto error_splat_super;
2756
2757 error = mount_info->set_security(s, mntroot, mount_info);
2758 if (error)
2759 goto error_splat_root;
2760
2761 s->s_flags |= SB_ACTIVE;
2762
2763 out:
2764 return mntroot;
2765
2766 out_err_nosb:
2767 nfs_free_server(server);
2768 goto out;
2769
2770 error_splat_root:
2771 dput(mntroot);
2772 mntroot = ERR_PTR(error);
2773 error_splat_super:
2774 deactivate_locked_super(s);
2775 goto out;
2776 }
2777 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2778
nfs_fs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2779 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2780 int flags, const char *dev_name, void *raw_data)
2781 {
2782 struct nfs_mount_info mount_info = {
2783 .fill_super = nfs_fill_super,
2784 .set_security = nfs_set_sb_security,
2785 };
2786 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2787 struct nfs_subversion *nfs_mod;
2788 int error;
2789
2790 mount_info.parsed = nfs_alloc_parsed_mount_data();
2791 mount_info.mntfh = nfs_alloc_fhandle();
2792 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2793 goto out;
2794
2795 /* Validate the mount data */
2796 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2797 if (error == NFS_TEXT_DATA)
2798 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2799 if (error < 0) {
2800 mntroot = ERR_PTR(error);
2801 goto out;
2802 }
2803
2804 nfs_mod = get_nfs_version(mount_info.parsed->version);
2805 if (IS_ERR(nfs_mod)) {
2806 mntroot = ERR_CAST(nfs_mod);
2807 goto out;
2808 }
2809
2810 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2811
2812 put_nfs_version(nfs_mod);
2813 out:
2814 nfs_free_parsed_mount_data(mount_info.parsed);
2815 nfs_free_fhandle(mount_info.mntfh);
2816 return mntroot;
2817 }
2818 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2819
2820 /*
2821 * Destroy an NFS2/3 superblock
2822 */
nfs_kill_super(struct super_block * s)2823 void nfs_kill_super(struct super_block *s)
2824 {
2825 struct nfs_server *server = NFS_SB(s);
2826 dev_t dev = s->s_dev;
2827
2828 generic_shutdown_super(s);
2829
2830 nfs_fscache_release_super_cookie(s);
2831
2832 nfs_free_server(server);
2833 free_anon_bdev(dev);
2834 }
2835 EXPORT_SYMBOL_GPL(nfs_kill_super);
2836
2837 /*
2838 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2839 */
2840 static struct dentry *
nfs_xdev_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2841 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2842 const char *dev_name, void *raw_data)
2843 {
2844 struct nfs_clone_mount *data = raw_data;
2845 struct nfs_mount_info mount_info = {
2846 .fill_super = nfs_clone_super,
2847 .set_security = nfs_clone_sb_security,
2848 .cloned = data,
2849 };
2850 struct nfs_server *server;
2851 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2852 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2853
2854 dprintk("--> nfs_xdev_mount()\n");
2855
2856 mount_info.mntfh = mount_info.cloned->fh;
2857
2858 /* create a new volume representation */
2859 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2860
2861 if (IS_ERR(server))
2862 mntroot = ERR_CAST(server);
2863 else
2864 mntroot = nfs_fs_mount_common(server, flags,
2865 dev_name, &mount_info, nfs_mod);
2866
2867 dprintk("<-- nfs_xdev_mount() = %ld\n",
2868 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2869 return mntroot;
2870 }
2871
2872 #if IS_ENABLED(CONFIG_NFS_V4)
2873
nfs4_validate_mount_flags(struct nfs_parsed_mount_data * args)2874 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2875 {
2876 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2877 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2878 }
2879
2880 /*
2881 * Validate NFSv4 mount options
2882 */
nfs4_validate_mount_data(void * options,struct nfs_parsed_mount_data * args,const char * dev_name)2883 static int nfs4_validate_mount_data(void *options,
2884 struct nfs_parsed_mount_data *args,
2885 const char *dev_name)
2886 {
2887 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2888 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2889 char *c;
2890
2891 if (data == NULL)
2892 goto out_no_data;
2893
2894 args->version = 4;
2895
2896 switch (data->version) {
2897 case 1:
2898 if (data->host_addrlen > sizeof(args->nfs_server.address))
2899 goto out_no_address;
2900 if (data->host_addrlen == 0)
2901 goto out_no_address;
2902 args->nfs_server.addrlen = data->host_addrlen;
2903 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2904 return -EFAULT;
2905 if (!nfs_verify_server_address(sap))
2906 goto out_no_address;
2907 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2908
2909 if (data->auth_flavourlen) {
2910 rpc_authflavor_t pseudoflavor;
2911 if (data->auth_flavourlen > 1)
2912 goto out_inval_auth;
2913 if (copy_from_user(&pseudoflavor,
2914 data->auth_flavours,
2915 sizeof(pseudoflavor)))
2916 return -EFAULT;
2917 args->selected_flavor = pseudoflavor;
2918 } else
2919 args->selected_flavor = RPC_AUTH_UNIX;
2920
2921 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2922 if (IS_ERR(c))
2923 return PTR_ERR(c);
2924 args->nfs_server.hostname = c;
2925
2926 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2927 if (IS_ERR(c))
2928 return PTR_ERR(c);
2929 args->nfs_server.export_path = c;
2930 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2931
2932 c = strndup_user(data->client_addr.data, 16);
2933 if (IS_ERR(c))
2934 return PTR_ERR(c);
2935 args->client_address = c;
2936
2937 /*
2938 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2939 * can deal with.
2940 */
2941
2942 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2943 args->rsize = data->rsize;
2944 args->wsize = data->wsize;
2945 args->timeo = data->timeo;
2946 args->retrans = data->retrans;
2947 args->acregmin = data->acregmin;
2948 args->acregmax = data->acregmax;
2949 args->acdirmin = data->acdirmin;
2950 args->acdirmax = data->acdirmax;
2951 args->nfs_server.protocol = data->proto;
2952 nfs_validate_transport_protocol(args);
2953 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2954 goto out_invalid_transport_udp;
2955
2956 break;
2957 default:
2958 return NFS_TEXT_DATA;
2959 }
2960
2961 return 0;
2962
2963 out_no_data:
2964 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2965 return -EINVAL;
2966
2967 out_inval_auth:
2968 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2969 data->auth_flavourlen);
2970 return -EINVAL;
2971
2972 out_no_address:
2973 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2974 return -EINVAL;
2975
2976 out_invalid_transport_udp:
2977 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2978 return -EINVAL;
2979 }
2980
2981 /*
2982 * NFS v4 module parameters need to stay in the
2983 * NFS client for backwards compatibility
2984 */
2985 unsigned int nfs_callback_set_tcpport;
2986 unsigned short nfs_callback_nr_threads;
2987 /* Default cache timeout is 10 minutes */
2988 unsigned int nfs_idmap_cache_timeout = 600;
2989 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2990 bool nfs4_disable_idmapping = true;
2991 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2992 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
2993 unsigned short send_implementation_id = 1;
2994 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2995 bool recover_lost_locks = false;
2996
2997 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
2998 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2999 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
3000 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
3001 EXPORT_SYMBOL_GPL(max_session_slots);
3002 EXPORT_SYMBOL_GPL(max_session_cb_slots);
3003 EXPORT_SYMBOL_GPL(send_implementation_id);
3004 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
3005 EXPORT_SYMBOL_GPL(recover_lost_locks);
3006
3007 #define NFS_CALLBACK_MAXPORTNR (65535U)
3008
param_set_portnr(const char * val,const struct kernel_param * kp)3009 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3010 {
3011 unsigned long num;
3012 int ret;
3013
3014 if (!val)
3015 return -EINVAL;
3016 ret = kstrtoul(val, 0, &num);
3017 if (ret || num > NFS_CALLBACK_MAXPORTNR)
3018 return -EINVAL;
3019 *((unsigned int *)kp->arg) = num;
3020 return 0;
3021 }
3022 static const struct kernel_param_ops param_ops_portnr = {
3023 .set = param_set_portnr,
3024 .get = param_get_uint,
3025 };
3026 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
3027
3028 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
3029 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
3030 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
3031 "assigned to the NFSv4 callback channels.");
3032 module_param(nfs_idmap_cache_timeout, int, 0644);
3033 module_param(nfs4_disable_idmapping, bool, 0644);
3034 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
3035 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
3036 MODULE_PARM_DESC(nfs4_disable_idmapping,
3037 "Turn off NFSv4 idmapping when using 'sec=sys'");
3038 module_param(max_session_slots, ushort, 0644);
3039 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
3040 "requests the client will negotiate");
3041 module_param(max_session_cb_slots, ushort, 0644);
3042 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
3043 "callbacks the client will process for a given server");
3044 module_param(send_implementation_id, ushort, 0644);
3045 MODULE_PARM_DESC(send_implementation_id,
3046 "Send implementation ID with NFSv4.1 exchange_id");
3047 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
3048
3049 module_param(recover_lost_locks, bool, 0644);
3050 MODULE_PARM_DESC(recover_lost_locks,
3051 "If the server reports that a lock might be lost, "
3052 "try to recover it risking data corruption.");
3053
3054
3055 #endif /* CONFIG_NFS_V4 */
3056