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drm/msm/mdp5: Use the interconnect API
[linux/fpc-iii.git] / fs / nfs / super.c
blobd6c687419a818d61ee49420ccc248803ee14d0a8
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/addr.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/sunrpc/xprtsock.h>
38 #include <linux/sunrpc/xprtrdma.h>
39 #include <linux/nfs_fs.h>
40 #include <linux/nfs_mount.h>
41 #include <linux/nfs4_mount.h>
42 #include <linux/lockd/bind.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/namei.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57
58 #include <linux/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "nfs4session.h"
67 #include "pnfs.h"
68 #include "nfs.h"
69
70 #define NFSDBG_FACILITY NFSDBG_VFS
71 #define NFS_TEXT_DATA 1
72
73 #if IS_ENABLED(CONFIG_NFS_V3)
74 #define NFS_DEFAULT_VERSION 3
75 #else
76 #define NFS_DEFAULT_VERSION 2
77 #endif
78
79 enum {
80 /* Mount options that take no arguments */
81 Opt_soft, Opt_softerr, Opt_hard,
82 Opt_posix, Opt_noposix,
83 Opt_cto, Opt_nocto,
84 Opt_ac, Opt_noac,
85 Opt_lock, Opt_nolock,
86 Opt_udp, Opt_tcp, Opt_rdma,
87 Opt_acl, Opt_noacl,
88 Opt_rdirplus, Opt_nordirplus,
89 Opt_sharecache, Opt_nosharecache,
90 Opt_resvport, Opt_noresvport,
91 Opt_fscache, Opt_nofscache,
92 Opt_migration, Opt_nomigration,
93
94 /* Mount options that take integer arguments */
95 Opt_port,
96 Opt_rsize, Opt_wsize, Opt_bsize,
97 Opt_timeo, Opt_retrans,
98 Opt_acregmin, Opt_acregmax,
99 Opt_acdirmin, Opt_acdirmax,
100 Opt_actimeo,
101 Opt_namelen,
102 Opt_mountport,
103 Opt_mountvers,
104 Opt_minorversion,
105
106 /* Mount options that take string arguments */
107 Opt_nfsvers,
108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
109 Opt_addr, Opt_mountaddr, Opt_clientaddr,
110 Opt_lookupcache,
111 Opt_fscache_uniq,
112 Opt_local_lock,
113
114 /* Special mount options */
115 Opt_userspace, Opt_deprecated, Opt_sloppy,
116
117 Opt_err
118 };
119
120 static const match_table_t nfs_mount_option_tokens = {
121 { Opt_userspace, "bg" },
122 { Opt_userspace, "fg" },
123 { Opt_userspace, "retry=%s" },
124
125 { Opt_sloppy, "sloppy" },
126
127 { Opt_soft, "soft" },
128 { Opt_softerr, "softerr" },
129 { Opt_hard, "hard" },
130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
132 { Opt_posix, "posix" },
133 { Opt_noposix, "noposix" },
134 { Opt_cto, "cto" },
135 { Opt_nocto, "nocto" },
136 { Opt_ac, "ac" },
137 { Opt_noac, "noac" },
138 { Opt_lock, "lock" },
139 { Opt_nolock, "nolock" },
140 { Opt_udp, "udp" },
141 { Opt_tcp, "tcp" },
142 { Opt_rdma, "rdma" },
143 { Opt_acl, "acl" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
151 { Opt_fscache, "fsc" },
152 { Opt_nofscache, "nofsc" },
153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
155
156 { Opt_port, "port=%s" },
157 { Opt_rsize, "rsize=%s" },
158 { Opt_wsize, "wsize=%s" },
159 { Opt_bsize, "bsize=%s" },
160 { Opt_timeo, "timeo=%s" },
161 { Opt_retrans, "retrans=%s" },
162 { Opt_acregmin, "acregmin=%s" },
163 { Opt_acregmax, "acregmax=%s" },
164 { Opt_acdirmin, "acdirmin=%s" },
165 { Opt_acdirmax, "acdirmax=%s" },
166 { Opt_actimeo, "actimeo=%s" },
167 { Opt_namelen, "namlen=%s" },
168 { Opt_mountport, "mountport=%s" },
169 { Opt_mountvers, "mountvers=%s" },
170 { Opt_minorversion, "minorversion=%s" },
171
172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
174
175 { Opt_sec, "sec=%s" },
176 { Opt_proto, "proto=%s" },
177 { Opt_mountproto, "mountproto=%s" },
178 { Opt_addr, "addr=%s" },
179 { Opt_clientaddr, "clientaddr=%s" },
180 { Opt_mounthost, "mounthost=%s" },
181 { Opt_mountaddr, "mountaddr=%s" },
182
183 { Opt_lookupcache, "lookupcache=%s" },
184 { Opt_fscache_uniq, "fsc=%s" },
185 { Opt_local_lock, "local_lock=%s" },
186
187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
189
190 { Opt_err, NULL }
191 };
192
193 enum {
194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
195 Opt_xprt_rdma6,
196
197 Opt_xprt_err
198 };
199
200 static const match_table_t nfs_xprt_protocol_tokens = {
201 { Opt_xprt_udp, "udp" },
202 { Opt_xprt_udp6, "udp6" },
203 { Opt_xprt_tcp, "tcp" },
204 { Opt_xprt_tcp6, "tcp6" },
205 { Opt_xprt_rdma, "rdma" },
206 { Opt_xprt_rdma6, "rdma6" },
207
208 { Opt_xprt_err, NULL }
209 };
210
211 enum {
212 Opt_sec_none, Opt_sec_sys,
213 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
214 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
215 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
216
217 Opt_sec_err
218 };
219
220 static const match_table_t nfs_secflavor_tokens = {
221 { Opt_sec_none, "none" },
222 { Opt_sec_none, "null" },
223 { Opt_sec_sys, "sys" },
224
225 { Opt_sec_krb5, "krb5" },
226 { Opt_sec_krb5i, "krb5i" },
227 { Opt_sec_krb5p, "krb5p" },
228
229 { Opt_sec_lkey, "lkey" },
230 { Opt_sec_lkeyi, "lkeyi" },
231 { Opt_sec_lkeyp, "lkeyp" },
232
233 { Opt_sec_spkm, "spkm3" },
234 { Opt_sec_spkmi, "spkm3i" },
235 { Opt_sec_spkmp, "spkm3p" },
236
237 { Opt_sec_err, NULL }
238 };
239
240 enum {
241 Opt_lookupcache_all, Opt_lookupcache_positive,
242 Opt_lookupcache_none,
243
244 Opt_lookupcache_err
245 };
246
247 static match_table_t nfs_lookupcache_tokens = {
248 { Opt_lookupcache_all, "all" },
249 { Opt_lookupcache_positive, "pos" },
250 { Opt_lookupcache_positive, "positive" },
251 { Opt_lookupcache_none, "none" },
252
253 { Opt_lookupcache_err, NULL }
254 };
255
256 enum {
257 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
258 Opt_local_lock_none,
259
260 Opt_local_lock_err
261 };
262
263 static match_table_t nfs_local_lock_tokens = {
264 { Opt_local_lock_all, "all" },
265 { Opt_local_lock_flock, "flock" },
266 { Opt_local_lock_posix, "posix" },
267 { Opt_local_lock_none, "none" },
268
269 { Opt_local_lock_err, NULL }
270 };
271
272 enum {
273 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
274 Opt_vers_4_1, Opt_vers_4_2,
275
276 Opt_vers_err
277 };
278
279 static match_table_t nfs_vers_tokens = {
280 { Opt_vers_2, "2" },
281 { Opt_vers_3, "3" },
282 { Opt_vers_4, "4" },
283 { Opt_vers_4_0, "4.0" },
284 { Opt_vers_4_1, "4.1" },
285 { Opt_vers_4_2, "4.2" },
286
287 { Opt_vers_err, NULL }
288 };
289
290 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
291 int flags, const char *dev_name, void *raw_data);
292
293 struct file_system_type nfs_fs_type = {
294 .owner = THIS_MODULE,
295 .name = "nfs",
296 .mount = nfs_fs_mount,
297 .kill_sb = nfs_kill_super,
298 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
299 };
300 MODULE_ALIAS_FS("nfs");
301 EXPORT_SYMBOL_GPL(nfs_fs_type);
302
303 struct file_system_type nfs_xdev_fs_type = {
304 .owner = THIS_MODULE,
305 .name = "nfs",
306 .mount = nfs_xdev_mount,
307 .kill_sb = nfs_kill_super,
308 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
309 };
310
311 const struct super_operations nfs_sops = {
312 .alloc_inode = nfs_alloc_inode,
313 .free_inode = nfs_free_inode,
314 .write_inode = nfs_write_inode,
315 .drop_inode = nfs_drop_inode,
316 .statfs = nfs_statfs,
317 .evict_inode = nfs_evict_inode,
318 .umount_begin = nfs_umount_begin,
319 .show_options = nfs_show_options,
320 .show_devname = nfs_show_devname,
321 .show_path = nfs_show_path,
322 .show_stats = nfs_show_stats,
323 .remount_fs = nfs_remount,
324 };
325 EXPORT_SYMBOL_GPL(nfs_sops);
326
327 #if IS_ENABLED(CONFIG_NFS_V4)
328 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
329 static int nfs4_validate_mount_data(void *options,
330 struct nfs_parsed_mount_data *args, const char *dev_name);
331
332 struct file_system_type nfs4_fs_type = {
333 .owner = THIS_MODULE,
334 .name = "nfs4",
335 .mount = nfs_fs_mount,
336 .kill_sb = nfs_kill_super,
337 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
338 };
339 MODULE_ALIAS_FS("nfs4");
340 MODULE_ALIAS("nfs4");
341 EXPORT_SYMBOL_GPL(nfs4_fs_type);
342
343 static int __init register_nfs4_fs(void)
344 {
345 return register_filesystem(&nfs4_fs_type);
346 }
347
348 static void unregister_nfs4_fs(void)
349 {
350 unregister_filesystem(&nfs4_fs_type);
351 }
352 #else
353 static int __init register_nfs4_fs(void)
354 {
355 return 0;
356 }
357
358 static void unregister_nfs4_fs(void)
359 {
360 }
361 #endif
362
363 static struct shrinker acl_shrinker = {
364 .count_objects = nfs_access_cache_count,
365 .scan_objects = nfs_access_cache_scan,
366 .seeks = DEFAULT_SEEKS,
367 };
368
369 /*
370 * Register the NFS filesystems
371 */
372 int __init register_nfs_fs(void)
373 {
374 int ret;
375
376 ret = register_filesystem(&nfs_fs_type);
377 if (ret < 0)
378 goto error_0;
379
380 ret = register_nfs4_fs();
381 if (ret < 0)
382 goto error_1;
383
384 ret = nfs_register_sysctl();
385 if (ret < 0)
386 goto error_2;
387 ret = register_shrinker(&acl_shrinker);
388 if (ret < 0)
389 goto error_3;
390 return 0;
391 error_3:
392 nfs_unregister_sysctl();
393 error_2:
394 unregister_nfs4_fs();
395 error_1:
396 unregister_filesystem(&nfs_fs_type);
397 error_0:
398 return ret;
399 }
400
401 /*
402 * Unregister the NFS filesystems
403 */
404 void __exit unregister_nfs_fs(void)
405 {
406 unregister_shrinker(&acl_shrinker);
407 nfs_unregister_sysctl();
408 unregister_nfs4_fs();
409 unregister_filesystem(&nfs_fs_type);
410 }
411
412 bool nfs_sb_active(struct super_block *sb)
413 {
414 struct nfs_server *server = NFS_SB(sb);
415
416 if (!atomic_inc_not_zero(&sb->s_active))
417 return false;
418 if (atomic_inc_return(&server->active) != 1)
419 atomic_dec(&sb->s_active);
420 return true;
421 }
422 EXPORT_SYMBOL_GPL(nfs_sb_active);
423
424 void nfs_sb_deactive(struct super_block *sb)
425 {
426 struct nfs_server *server = NFS_SB(sb);
427
428 if (atomic_dec_and_test(&server->active))
429 deactivate_super(sb);
430 }
431 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
432
433 /*
434 * Deliver file system statistics to userspace
435 */
436 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
437 {
438 struct nfs_server *server = NFS_SB(dentry->d_sb);
439 unsigned char blockbits;
440 unsigned long blockres;
441 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
442 struct nfs_fsstat res;
443 int error = -ENOMEM;
444
445 res.fattr = nfs_alloc_fattr();
446 if (res.fattr == NULL)
447 goto out_err;
448
449 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
450 if (unlikely(error == -ESTALE)) {
451 struct dentry *pd_dentry;
452
453 pd_dentry = dget_parent(dentry);
454 if (pd_dentry != NULL) {
455 nfs_zap_caches(d_inode(pd_dentry));
456 dput(pd_dentry);
457 }
458 }
459 nfs_free_fattr(res.fattr);
460 if (error < 0)
461 goto out_err;
462
463 buf->f_type = NFS_SUPER_MAGIC;
464
465 /*
466 * Current versions of glibc do not correctly handle the
467 * case where f_frsize != f_bsize. Eventually we want to
468 * report the value of wtmult in this field.
469 */
470 buf->f_frsize = dentry->d_sb->s_blocksize;
471
472 /*
473 * On most *nix systems, f_blocks, f_bfree, and f_bavail
474 * are reported in units of f_frsize. Linux hasn't had
475 * an f_frsize field in its statfs struct until recently,
476 * thus historically Linux's sys_statfs reports these
477 * fields in units of f_bsize.
478 */
479 buf->f_bsize = dentry->d_sb->s_blocksize;
480 blockbits = dentry->d_sb->s_blocksize_bits;
481 blockres = (1 << blockbits) - 1;
482 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
483 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
484 buf->f_bavail = (res.abytes + blockres) >> blockbits;
485
486 buf->f_files = res.tfiles;
487 buf->f_ffree = res.afiles;
488
489 buf->f_namelen = server->namelen;
490
491 return 0;
492
493 out_err:
494 dprintk("%s: statfs error = %d\n", __func__, -error);
495 return error;
496 }
497 EXPORT_SYMBOL_GPL(nfs_statfs);
498
499 /*
500 * Map the security flavour number to a name
501 */
502 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
503 {
504 static const struct {
505 rpc_authflavor_t flavour;
506 const char *str;
507 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
508 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
509 { RPC_AUTH_NULL, "null" },
510 { RPC_AUTH_UNIX, "sys" },
511 { RPC_AUTH_GSS_KRB5, "krb5" },
512 { RPC_AUTH_GSS_KRB5I, "krb5i" },
513 { RPC_AUTH_GSS_KRB5P, "krb5p" },
514 { RPC_AUTH_GSS_LKEY, "lkey" },
515 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
516 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
517 { RPC_AUTH_GSS_SPKM, "spkm" },
518 { RPC_AUTH_GSS_SPKMI, "spkmi" },
519 { RPC_AUTH_GSS_SPKMP, "spkmp" },
520 { UINT_MAX, "unknown" }
521 };
522 int i;
523
524 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
525 if (sec_flavours[i].flavour == flavour)
526 break;
527 }
528 return sec_flavours[i].str;
529 }
530
531 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
532 int showdefaults)
533 {
534 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
535 char *proto = NULL;
536
537 switch (sap->sa_family) {
538 case AF_INET:
539 switch (nfss->mountd_protocol) {
540 case IPPROTO_UDP:
541 proto = RPCBIND_NETID_UDP;
542 break;
543 case IPPROTO_TCP:
544 proto = RPCBIND_NETID_TCP;
545 break;
546 }
547 break;
548 case AF_INET6:
549 switch (nfss->mountd_protocol) {
550 case IPPROTO_UDP:
551 proto = RPCBIND_NETID_UDP6;
552 break;
553 case IPPROTO_TCP:
554 proto = RPCBIND_NETID_TCP6;
555 break;
556 }
557 break;
558 }
559 if (proto || showdefaults)
560 seq_printf(m, ",mountproto=%s", proto ?: "auto");
561 }
562
563 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
564 int showdefaults)
565 {
566 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
567
568 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
569 return;
570
571 switch (sap->sa_family) {
572 case AF_INET: {
573 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
574 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
575 break;
576 }
577 case AF_INET6: {
578 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
579 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
580 break;
581 }
582 default:
583 if (showdefaults)
584 seq_printf(m, ",mountaddr=unspecified");
585 }
586
587 if (nfss->mountd_version || showdefaults)
588 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
589 if ((nfss->mountd_port &&
590 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
591 showdefaults)
592 seq_printf(m, ",mountport=%u", nfss->mountd_port);
593
594 nfs_show_mountd_netid(m, nfss, showdefaults);
595 }
596
597 #if IS_ENABLED(CONFIG_NFS_V4)
598 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
599 int showdefaults)
600 {
601 struct nfs_client *clp = nfss->nfs_client;
602
603 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
604 }
605 #else
606 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
607 int showdefaults)
608 {
609 }
610 #endif
611
612 static void nfs_show_nfs_version(struct seq_file *m,
613 unsigned int version,
614 unsigned int minorversion)
615 {
616 seq_printf(m, ",vers=%u", version);
617 if (version == 4)
618 seq_printf(m, ".%u", minorversion);
619 }
620
621 /*
622 * Describe the mount options in force on this server representation
623 */
624 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
625 int showdefaults)
626 {
627 static const struct proc_nfs_info {
628 int flag;
629 const char *str;
630 const char *nostr;
631 } nfs_info[] = {
632 { NFS_MOUNT_SOFT, ",soft", "" },
633 { NFS_MOUNT_SOFTERR, ",softerr", "" },
634 { NFS_MOUNT_POSIX, ",posix", "" },
635 { NFS_MOUNT_NOCTO, ",nocto", "" },
636 { NFS_MOUNT_NOAC, ",noac", "" },
637 { NFS_MOUNT_NONLM, ",nolock", "" },
638 { NFS_MOUNT_NOACL, ",noacl", "" },
639 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
640 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
641 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
642 { 0, NULL, NULL }
643 };
644 const struct proc_nfs_info *nfs_infop;
645 struct nfs_client *clp = nfss->nfs_client;
646 u32 version = clp->rpc_ops->version;
647 int local_flock, local_fcntl;
648
649 nfs_show_nfs_version(m, version, clp->cl_minorversion);
650 seq_printf(m, ",rsize=%u", nfss->rsize);
651 seq_printf(m, ",wsize=%u", nfss->wsize);
652 if (nfss->bsize != 0)
653 seq_printf(m, ",bsize=%u", nfss->bsize);
654 seq_printf(m, ",namlen=%u", nfss->namelen);
655 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
656 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
657 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
658 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
659 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
660 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
661 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
662 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
663 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
664 seq_puts(m, ",hard");
665 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
666 if (nfss->flags & nfs_infop->flag)
667 seq_puts(m, nfs_infop->str);
668 else
669 seq_puts(m, nfs_infop->nostr);
670 }
671 rcu_read_lock();
672 seq_printf(m, ",proto=%s",
673 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
674 rcu_read_unlock();
675 if (version == 4) {
676 if (nfss->port != NFS_PORT)
677 seq_printf(m, ",port=%u", nfss->port);
678 } else
679 if (nfss->port)
680 seq_printf(m, ",port=%u", nfss->port);
681
682 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
683 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
684 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
685
686 if (version != 4)
687 nfs_show_mountd_options(m, nfss, showdefaults);
688 else
689 nfs_show_nfsv4_options(m, nfss, showdefaults);
690
691 if (nfss->options & NFS_OPTION_FSCACHE)
692 seq_printf(m, ",fsc");
693
694 if (nfss->options & NFS_OPTION_MIGRATION)
695 seq_printf(m, ",migration");
696
697 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
698 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
699 seq_printf(m, ",lookupcache=none");
700 else
701 seq_printf(m, ",lookupcache=pos");
702 }
703
704 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
705 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
706
707 if (!local_flock && !local_fcntl)
708 seq_printf(m, ",local_lock=none");
709 else if (local_flock && local_fcntl)
710 seq_printf(m, ",local_lock=all");
711 else if (local_flock)
712 seq_printf(m, ",local_lock=flock");
713 else
714 seq_printf(m, ",local_lock=posix");
715 }
716
717 /*
718 * Describe the mount options on this VFS mountpoint
719 */
720 int nfs_show_options(struct seq_file *m, struct dentry *root)
721 {
722 struct nfs_server *nfss = NFS_SB(root->d_sb);
723
724 nfs_show_mount_options(m, nfss, 0);
725
726 rcu_read_lock();
727 seq_printf(m, ",addr=%s",
728 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
729 RPC_DISPLAY_ADDR));
730 rcu_read_unlock();
731
732 return 0;
733 }
734 EXPORT_SYMBOL_GPL(nfs_show_options);
735
736 #if IS_ENABLED(CONFIG_NFS_V4)
737 #ifdef CONFIG_NFS_V4_1
738 static void show_sessions(struct seq_file *m, struct nfs_server *server)
739 {
740 if (nfs4_has_session(server->nfs_client))
741 seq_printf(m, ",sessions");
742 }
743 #else
744 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
745 #endif
746 #endif
747
748 #ifdef CONFIG_NFS_V4_1
749 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
750 {
751 seq_printf(m, ",pnfs=");
752 if (server->pnfs_curr_ld)
753 seq_printf(m, "%s", server->pnfs_curr_ld->name);
754 else
755 seq_printf(m, "not configured");
756 }
757
758 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
759 {
760 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
761 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
762 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
763 "date='%llu,%u'",
764 impl_id->name, impl_id->domain,
765 impl_id->date.seconds, impl_id->date.nseconds);
766 }
767 }
768 #else
769 #if IS_ENABLED(CONFIG_NFS_V4)
770 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
771 {
772 }
773 #endif
774 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
775 {
776 }
777 #endif
778
779 int nfs_show_devname(struct seq_file *m, struct dentry *root)
780 {
781 char *page = (char *) __get_free_page(GFP_KERNEL);
782 char *devname, *dummy;
783 int err = 0;
784 if (!page)
785 return -ENOMEM;
786 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
787 if (IS_ERR(devname))
788 err = PTR_ERR(devname);
789 else
790 seq_escape(m, devname, " \t\n\\");
791 free_page((unsigned long)page);
792 return err;
793 }
794 EXPORT_SYMBOL_GPL(nfs_show_devname);
795
796 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
797 {
798 seq_puts(m, "/");
799 return 0;
800 }
801 EXPORT_SYMBOL_GPL(nfs_show_path);
802
803 /*
804 * Present statistical information for this VFS mountpoint
805 */
806 int nfs_show_stats(struct seq_file *m, struct dentry *root)
807 {
808 int i, cpu;
809 struct nfs_server *nfss = NFS_SB(root->d_sb);
810 struct rpc_auth *auth = nfss->client->cl_auth;
811 struct nfs_iostats totals = { };
812
813 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
814
815 /*
816 * Display all mount option settings
817 */
818 seq_printf(m, "\n\topts:\t");
819 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
820 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
821 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
822 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
823 nfs_show_mount_options(m, nfss, 1);
824
825 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
826
827 show_implementation_id(m, nfss);
828
829 seq_printf(m, "\n\tcaps:\t");
830 seq_printf(m, "caps=0x%x", nfss->caps);
831 seq_printf(m, ",wtmult=%u", nfss->wtmult);
832 seq_printf(m, ",dtsize=%u", nfss->dtsize);
833 seq_printf(m, ",bsize=%u", nfss->bsize);
834 seq_printf(m, ",namlen=%u", nfss->namelen);
835
836 #if IS_ENABLED(CONFIG_NFS_V4)
837 if (nfss->nfs_client->rpc_ops->version == 4) {
838 seq_printf(m, "\n\tnfsv4:\t");
839 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
840 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
841 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
842 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
843 show_sessions(m, nfss);
844 show_pnfs(m, nfss);
845 }
846 #endif
847
848 /*
849 * Display security flavor in effect for this mount
850 */
851 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
852 if (auth->au_flavor)
853 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
854
855 /*
856 * Display superblock I/O counters
857 */
858 for_each_possible_cpu(cpu) {
859 struct nfs_iostats *stats;
860
861 preempt_disable();
862 stats = per_cpu_ptr(nfss->io_stats, cpu);
863
864 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
865 totals.events[i] += stats->events[i];
866 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
867 totals.bytes[i] += stats->bytes[i];
868 #ifdef CONFIG_NFS_FSCACHE
869 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
870 totals.fscache[i] += stats->fscache[i];
871 #endif
872
873 preempt_enable();
874 }
875
876 seq_printf(m, "\n\tevents:\t");
877 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
878 seq_printf(m, "%lu ", totals.events[i]);
879 seq_printf(m, "\n\tbytes:\t");
880 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
881 seq_printf(m, "%Lu ", totals.bytes[i]);
882 #ifdef CONFIG_NFS_FSCACHE
883 if (nfss->options & NFS_OPTION_FSCACHE) {
884 seq_printf(m, "\n\tfsc:\t");
885 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
886 seq_printf(m, "%Lu ", totals.fscache[i]);
887 }
888 #endif
889 seq_printf(m, "\n");
890
891 rpc_clnt_show_stats(m, nfss->client);
892
893 return 0;
894 }
895 EXPORT_SYMBOL_GPL(nfs_show_stats);
896
897 /*
898 * Begin unmount by attempting to remove all automounted mountpoints we added
899 * in response to xdev traversals and referrals
900 */
901 void nfs_umount_begin(struct super_block *sb)
902 {
903 struct nfs_server *server;
904 struct rpc_clnt *rpc;
905
906 server = NFS_SB(sb);
907 /* -EIO all pending I/O */
908 rpc = server->client_acl;
909 if (!IS_ERR(rpc))
910 rpc_killall_tasks(rpc);
911 rpc = server->client;
912 if (!IS_ERR(rpc))
913 rpc_killall_tasks(rpc);
914 }
915 EXPORT_SYMBOL_GPL(nfs_umount_begin);
916
917 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
918 {
919 struct nfs_parsed_mount_data *data;
920
921 data = kzalloc(sizeof(*data), GFP_KERNEL);
922 if (data) {
923 data->timeo = NFS_UNSPEC_TIMEO;
924 data->retrans = NFS_UNSPEC_RETRANS;
925 data->acregmin = NFS_DEF_ACREGMIN;
926 data->acregmax = NFS_DEF_ACREGMAX;
927 data->acdirmin = NFS_DEF_ACDIRMIN;
928 data->acdirmax = NFS_DEF_ACDIRMAX;
929 data->mount_server.port = NFS_UNSPEC_PORT;
930 data->nfs_server.port = NFS_UNSPEC_PORT;
931 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
932 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
933 data->minorversion = 0;
934 data->need_mount = true;
935 data->net = current->nsproxy->net_ns;
936 data->lsm_opts = NULL;
937 }
938 return data;
939 }
940
941 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
942 {
943 if (data) {
944 kfree(data->client_address);
945 kfree(data->mount_server.hostname);
946 kfree(data->nfs_server.export_path);
947 kfree(data->nfs_server.hostname);
948 kfree(data->fscache_uniq);
949 security_free_mnt_opts(&data->lsm_opts);
950 kfree(data);
951 }
952 }
953
954 /*
955 * Sanity-check a server address provided by the mount command.
956 *
957 * Address family must be initialized, and address must not be
958 * the ANY address for that family.
959 */
960 static int nfs_verify_server_address(struct sockaddr *addr)
961 {
962 switch (addr->sa_family) {
963 case AF_INET: {
964 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
965 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
966 }
967 case AF_INET6: {
968 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
969 return !ipv6_addr_any(sa);
970 }
971 }
972
973 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
974 return 0;
975 }
976
977 /*
978 * Select between a default port value and a user-specified port value.
979 * If a zero value is set, then autobind will be used.
980 */
981 static void nfs_set_port(struct sockaddr *sap, int *port,
982 const unsigned short default_port)
983 {
984 if (*port == NFS_UNSPEC_PORT)
985 *port = default_port;
986
987 rpc_set_port(sap, *port);
988 }
989
990 /*
991 * Sanity check the NFS transport protocol.
992 *
993 */
994 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
995 {
996 switch (mnt->nfs_server.protocol) {
997 case XPRT_TRANSPORT_UDP:
998 case XPRT_TRANSPORT_TCP:
999 case XPRT_TRANSPORT_RDMA:
1000 break;
1001 default:
1002 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1003 }
1004 }
1005
1006 /*
1007 * For text based NFSv2/v3 mounts, the mount protocol transport default
1008 * settings should depend upon the specified NFS transport.
1009 */
1010 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1011 {
1012 nfs_validate_transport_protocol(mnt);
1013
1014 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1015 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1016 return;
1017 switch (mnt->nfs_server.protocol) {
1018 case XPRT_TRANSPORT_UDP:
1019 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1020 break;
1021 case XPRT_TRANSPORT_TCP:
1022 case XPRT_TRANSPORT_RDMA:
1023 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1024 }
1025 }
1026
1027 /*
1028 * Add 'flavor' to 'auth_info' if not already present.
1029 * Returns true if 'flavor' ends up in the list, false otherwise
1030 */
1031 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1032 rpc_authflavor_t flavor)
1033 {
1034 unsigned int i;
1035 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1036
1037 /* make sure this flavor isn't already in the list */
1038 for (i = 0; i < auth_info->flavor_len; i++) {
1039 if (flavor == auth_info->flavors[i])
1040 return true;
1041 }
1042
1043 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1044 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1045 return false;
1046 }
1047
1048 auth_info->flavors[auth_info->flavor_len++] = flavor;
1049 return true;
1050 }
1051
1052 /*
1053 * Return true if 'match' is in auth_info or auth_info is empty.
1054 * Return false otherwise.
1055 */
1056 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1057 rpc_authflavor_t match)
1058 {
1059 int i;
1060
1061 if (!auth_info->flavor_len)
1062 return true;
1063
1064 for (i = 0; i < auth_info->flavor_len; i++) {
1065 if (auth_info->flavors[i] == match)
1066 return true;
1067 }
1068 return false;
1069 }
1070 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1071
1072 /*
1073 * Parse the value of the 'sec=' option.
1074 */
1075 static int nfs_parse_security_flavors(char *value,
1076 struct nfs_parsed_mount_data *mnt)
1077 {
1078 substring_t args[MAX_OPT_ARGS];
1079 rpc_authflavor_t pseudoflavor;
1080 char *p;
1081
1082 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1083
1084 while ((p = strsep(&value, ":")) != NULL) {
1085 switch (match_token(p, nfs_secflavor_tokens, args)) {
1086 case Opt_sec_none:
1087 pseudoflavor = RPC_AUTH_NULL;
1088 break;
1089 case Opt_sec_sys:
1090 pseudoflavor = RPC_AUTH_UNIX;
1091 break;
1092 case Opt_sec_krb5:
1093 pseudoflavor = RPC_AUTH_GSS_KRB5;
1094 break;
1095 case Opt_sec_krb5i:
1096 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1097 break;
1098 case Opt_sec_krb5p:
1099 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1100 break;
1101 case Opt_sec_lkey:
1102 pseudoflavor = RPC_AUTH_GSS_LKEY;
1103 break;
1104 case Opt_sec_lkeyi:
1105 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1106 break;
1107 case Opt_sec_lkeyp:
1108 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1109 break;
1110 case Opt_sec_spkm:
1111 pseudoflavor = RPC_AUTH_GSS_SPKM;
1112 break;
1113 case Opt_sec_spkmi:
1114 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1115 break;
1116 case Opt_sec_spkmp:
1117 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1118 break;
1119 default:
1120 dfprintk(MOUNT,
1121 "NFS: sec= option '%s' not recognized\n", p);
1122 return 0;
1123 }
1124
1125 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1126 return 0;
1127 }
1128
1129 return 1;
1130 }
1131
1132 static int nfs_parse_version_string(char *string,
1133 struct nfs_parsed_mount_data *mnt,
1134 substring_t *args)
1135 {
1136 mnt->flags &= ~NFS_MOUNT_VER3;
1137 switch (match_token(string, nfs_vers_tokens, args)) {
1138 case Opt_vers_2:
1139 mnt->version = 2;
1140 break;
1141 case Opt_vers_3:
1142 mnt->flags |= NFS_MOUNT_VER3;
1143 mnt->version = 3;
1144 break;
1145 case Opt_vers_4:
1146 /* Backward compatibility option. In future,
1147 * the mount program should always supply
1148 * a NFSv4 minor version number.
1149 */
1150 mnt->version = 4;
1151 break;
1152 case Opt_vers_4_0:
1153 mnt->version = 4;
1154 mnt->minorversion = 0;
1155 break;
1156 case Opt_vers_4_1:
1157 mnt->version = 4;
1158 mnt->minorversion = 1;
1159 break;
1160 case Opt_vers_4_2:
1161 mnt->version = 4;
1162 mnt->minorversion = 2;
1163 break;
1164 default:
1165 return 0;
1166 }
1167 return 1;
1168 }
1169
1170 static int nfs_get_option_str(substring_t args[], char **option)
1171 {
1172 kfree(*option);
1173 *option = match_strdup(args);
1174 return !*option;
1175 }
1176
1177 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1178 {
1179 int rc;
1180 char *string;
1181
1182 string = match_strdup(args);
1183 if (string == NULL)
1184 return -ENOMEM;
1185 rc = kstrtoul(string, 10, option);
1186 kfree(string);
1187
1188 return rc;
1189 }
1190
1191 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
1192 unsigned long l_bound, unsigned long u_bound)
1193 {
1194 int ret;
1195
1196 ret = nfs_get_option_ul(args, option);
1197 if (ret != 0)
1198 return ret;
1199 if (*option < l_bound || *option > u_bound)
1200 return -ERANGE;
1201 return 0;
1202 }
1203
1204 /*
1205 * Error-check and convert a string of mount options from user space into
1206 * a data structure. The whole mount string is processed; bad options are
1207 * skipped as they are encountered. If there were no errors, return 1;
1208 * otherwise return 0 (zero).
1209 */
1210 static int nfs_parse_mount_options(char *raw,
1211 struct nfs_parsed_mount_data *mnt)
1212 {
1213 char *p, *string;
1214 int rc, sloppy = 0, invalid_option = 0;
1215 unsigned short protofamily = AF_UNSPEC;
1216 unsigned short mountfamily = AF_UNSPEC;
1217
1218 if (!raw) {
1219 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1220 return 1;
1221 }
1222 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1223
1224 rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
1225 if (rc)
1226 goto out_security_failure;
1227
1228 while ((p = strsep(&raw, ",")) != NULL) {
1229 substring_t args[MAX_OPT_ARGS];
1230 unsigned long option;
1231 int token;
1232
1233 if (!*p)
1234 continue;
1235
1236 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1237
1238 token = match_token(p, nfs_mount_option_tokens, args);
1239 switch (token) {
1240
1241 /*
1242 * boolean options: foo/nofoo
1243 */
1244 case Opt_soft:
1245 mnt->flags |= NFS_MOUNT_SOFT;
1246 mnt->flags &= ~NFS_MOUNT_SOFTERR;
1247 break;
1248 case Opt_softerr:
1249 mnt->flags |= NFS_MOUNT_SOFTERR;
1250 mnt->flags &= ~NFS_MOUNT_SOFT;
1251 break;
1252 case Opt_hard:
1253 mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
1254 break;
1255 case Opt_posix:
1256 mnt->flags |= NFS_MOUNT_POSIX;
1257 break;
1258 case Opt_noposix:
1259 mnt->flags &= ~NFS_MOUNT_POSIX;
1260 break;
1261 case Opt_cto:
1262 mnt->flags &= ~NFS_MOUNT_NOCTO;
1263 break;
1264 case Opt_nocto:
1265 mnt->flags |= NFS_MOUNT_NOCTO;
1266 break;
1267 case Opt_ac:
1268 mnt->flags &= ~NFS_MOUNT_NOAC;
1269 break;
1270 case Opt_noac:
1271 mnt->flags |= NFS_MOUNT_NOAC;
1272 break;
1273 case Opt_lock:
1274 mnt->flags &= ~NFS_MOUNT_NONLM;
1275 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1276 NFS_MOUNT_LOCAL_FCNTL);
1277 break;
1278 case Opt_nolock:
1279 mnt->flags |= NFS_MOUNT_NONLM;
1280 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1281 NFS_MOUNT_LOCAL_FCNTL);
1282 break;
1283 case Opt_udp:
1284 mnt->flags &= ~NFS_MOUNT_TCP;
1285 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1286 break;
1287 case Opt_tcp:
1288 mnt->flags |= NFS_MOUNT_TCP;
1289 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1290 break;
1291 case Opt_rdma:
1292 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1293 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1294 xprt_load_transport(p);
1295 break;
1296 case Opt_acl:
1297 mnt->flags &= ~NFS_MOUNT_NOACL;
1298 break;
1299 case Opt_noacl:
1300 mnt->flags |= NFS_MOUNT_NOACL;
1301 break;
1302 case Opt_rdirplus:
1303 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1304 break;
1305 case Opt_nordirplus:
1306 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1307 break;
1308 case Opt_sharecache:
1309 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1310 break;
1311 case Opt_nosharecache:
1312 mnt->flags |= NFS_MOUNT_UNSHARED;
1313 break;
1314 case Opt_resvport:
1315 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1316 break;
1317 case Opt_noresvport:
1318 mnt->flags |= NFS_MOUNT_NORESVPORT;
1319 break;
1320 case Opt_fscache:
1321 mnt->options |= NFS_OPTION_FSCACHE;
1322 kfree(mnt->fscache_uniq);
1323 mnt->fscache_uniq = NULL;
1324 break;
1325 case Opt_nofscache:
1326 mnt->options &= ~NFS_OPTION_FSCACHE;
1327 kfree(mnt->fscache_uniq);
1328 mnt->fscache_uniq = NULL;
1329 break;
1330 case Opt_migration:
1331 mnt->options |= NFS_OPTION_MIGRATION;
1332 break;
1333 case Opt_nomigration:
1334 mnt->options &= ~NFS_OPTION_MIGRATION;
1335 break;
1336
1337 /*
1338 * options that take numeric values
1339 */
1340 case Opt_port:
1341 if (nfs_get_option_ul(args, &option) ||
1342 option > USHRT_MAX)
1343 goto out_invalid_value;
1344 mnt->nfs_server.port = option;
1345 break;
1346 case Opt_rsize:
1347 if (nfs_get_option_ul(args, &option))
1348 goto out_invalid_value;
1349 mnt->rsize = option;
1350 break;
1351 case Opt_wsize:
1352 if (nfs_get_option_ul(args, &option))
1353 goto out_invalid_value;
1354 mnt->wsize = option;
1355 break;
1356 case Opt_bsize:
1357 if (nfs_get_option_ul(args, &option))
1358 goto out_invalid_value;
1359 mnt->bsize = option;
1360 break;
1361 case Opt_timeo:
1362 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
1363 goto out_invalid_value;
1364 mnt->timeo = option;
1365 break;
1366 case Opt_retrans:
1367 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
1368 goto out_invalid_value;
1369 mnt->retrans = option;
1370 break;
1371 case Opt_acregmin:
1372 if (nfs_get_option_ul(args, &option))
1373 goto out_invalid_value;
1374 mnt->acregmin = option;
1375 break;
1376 case Opt_acregmax:
1377 if (nfs_get_option_ul(args, &option))
1378 goto out_invalid_value;
1379 mnt->acregmax = option;
1380 break;
1381 case Opt_acdirmin:
1382 if (nfs_get_option_ul(args, &option))
1383 goto out_invalid_value;
1384 mnt->acdirmin = option;
1385 break;
1386 case Opt_acdirmax:
1387 if (nfs_get_option_ul(args, &option))
1388 goto out_invalid_value;
1389 mnt->acdirmax = option;
1390 break;
1391 case Opt_actimeo:
1392 if (nfs_get_option_ul(args, &option))
1393 goto out_invalid_value;
1394 mnt->acregmin = mnt->acregmax =
1395 mnt->acdirmin = mnt->acdirmax = option;
1396 break;
1397 case Opt_namelen:
1398 if (nfs_get_option_ul(args, &option))
1399 goto out_invalid_value;
1400 mnt->namlen = option;
1401 break;
1402 case Opt_mountport:
1403 if (nfs_get_option_ul(args, &option) ||
1404 option > USHRT_MAX)
1405 goto out_invalid_value;
1406 mnt->mount_server.port = option;
1407 break;
1408 case Opt_mountvers:
1409 if (nfs_get_option_ul(args, &option) ||
1410 option < NFS_MNT_VERSION ||
1411 option > NFS_MNT3_VERSION)
1412 goto out_invalid_value;
1413 mnt->mount_server.version = option;
1414 break;
1415 case Opt_minorversion:
1416 if (nfs_get_option_ul(args, &option))
1417 goto out_invalid_value;
1418 if (option > NFS4_MAX_MINOR_VERSION)
1419 goto out_invalid_value;
1420 mnt->minorversion = option;
1421 break;
1422
1423 /*
1424 * options that take text values
1425 */
1426 case Opt_nfsvers:
1427 string = match_strdup(args);
1428 if (string == NULL)
1429 goto out_nomem;
1430 rc = nfs_parse_version_string(string, mnt, args);
1431 kfree(string);
1432 if (!rc)
1433 goto out_invalid_value;
1434 break;
1435 case Opt_sec:
1436 string = match_strdup(args);
1437 if (string == NULL)
1438 goto out_nomem;
1439 rc = nfs_parse_security_flavors(string, mnt);
1440 kfree(string);
1441 if (!rc) {
1442 dfprintk(MOUNT, "NFS: unrecognized "
1443 "security flavor\n");
1444 return 0;
1445 }
1446 break;
1447 case Opt_proto:
1448 string = match_strdup(args);
1449 if (string == NULL)
1450 goto out_nomem;
1451 token = match_token(string,
1452 nfs_xprt_protocol_tokens, args);
1453
1454 protofamily = AF_INET;
1455 switch (token) {
1456 case Opt_xprt_udp6:
1457 protofamily = AF_INET6;
1458 /* fall through */
1459 case Opt_xprt_udp:
1460 mnt->flags &= ~NFS_MOUNT_TCP;
1461 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1462 break;
1463 case Opt_xprt_tcp6:
1464 protofamily = AF_INET6;
1465 /* fall through */
1466 case Opt_xprt_tcp:
1467 mnt->flags |= NFS_MOUNT_TCP;
1468 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1469 break;
1470 case Opt_xprt_rdma6:
1471 protofamily = AF_INET6;
1472 /* fall through */
1473 case Opt_xprt_rdma:
1474 /* vector side protocols to TCP */
1475 mnt->flags |= NFS_MOUNT_TCP;
1476 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1477 xprt_load_transport(string);
1478 break;
1479 default:
1480 dfprintk(MOUNT, "NFS: unrecognized "
1481 "transport protocol\n");
1482 kfree(string);
1483 return 0;
1484 }
1485 kfree(string);
1486 break;
1487 case Opt_mountproto:
1488 string = match_strdup(args);
1489 if (string == NULL)
1490 goto out_nomem;
1491 token = match_token(string,
1492 nfs_xprt_protocol_tokens, args);
1493 kfree(string);
1494
1495 mountfamily = AF_INET;
1496 switch (token) {
1497 case Opt_xprt_udp6:
1498 mountfamily = AF_INET6;
1499 /* fall through */
1500 case Opt_xprt_udp:
1501 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1502 break;
1503 case Opt_xprt_tcp6:
1504 mountfamily = AF_INET6;
1505 /* fall through */
1506 case Opt_xprt_tcp:
1507 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1508 break;
1509 case Opt_xprt_rdma: /* not used for side protocols */
1510 default:
1511 dfprintk(MOUNT, "NFS: unrecognized "
1512 "transport protocol\n");
1513 return 0;
1514 }
1515 break;
1516 case Opt_addr:
1517 string = match_strdup(args);
1518 if (string == NULL)
1519 goto out_nomem;
1520 mnt->nfs_server.addrlen =
1521 rpc_pton(mnt->net, string, strlen(string),
1522 (struct sockaddr *)
1523 &mnt->nfs_server.address,
1524 sizeof(mnt->nfs_server.address));
1525 kfree(string);
1526 if (mnt->nfs_server.addrlen == 0)
1527 goto out_invalid_address;
1528 break;
1529 case Opt_clientaddr:
1530 if (nfs_get_option_str(args, &mnt->client_address))
1531 goto out_nomem;
1532 break;
1533 case Opt_mounthost:
1534 if (nfs_get_option_str(args,
1535 &mnt->mount_server.hostname))
1536 goto out_nomem;
1537 break;
1538 case Opt_mountaddr:
1539 string = match_strdup(args);
1540 if (string == NULL)
1541 goto out_nomem;
1542 mnt->mount_server.addrlen =
1543 rpc_pton(mnt->net, string, strlen(string),
1544 (struct sockaddr *)
1545 &mnt->mount_server.address,
1546 sizeof(mnt->mount_server.address));
1547 kfree(string);
1548 if (mnt->mount_server.addrlen == 0)
1549 goto out_invalid_address;
1550 break;
1551 case Opt_lookupcache:
1552 string = match_strdup(args);
1553 if (string == NULL)
1554 goto out_nomem;
1555 token = match_token(string,
1556 nfs_lookupcache_tokens, args);
1557 kfree(string);
1558 switch (token) {
1559 case Opt_lookupcache_all:
1560 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1561 break;
1562 case Opt_lookupcache_positive:
1563 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1564 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1565 break;
1566 case Opt_lookupcache_none:
1567 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1568 break;
1569 default:
1570 dfprintk(MOUNT, "NFS: invalid "
1571 "lookupcache argument\n");
1572 return 0;
1573 };
1574 break;
1575 case Opt_fscache_uniq:
1576 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1577 goto out_nomem;
1578 mnt->options |= NFS_OPTION_FSCACHE;
1579 break;
1580 case Opt_local_lock:
1581 string = match_strdup(args);
1582 if (string == NULL)
1583 goto out_nomem;
1584 token = match_token(string, nfs_local_lock_tokens,
1585 args);
1586 kfree(string);
1587 switch (token) {
1588 case Opt_local_lock_all:
1589 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1590 NFS_MOUNT_LOCAL_FCNTL);
1591 break;
1592 case Opt_local_lock_flock:
1593 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1594 break;
1595 case Opt_local_lock_posix:
1596 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1597 break;
1598 case Opt_local_lock_none:
1599 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1600 NFS_MOUNT_LOCAL_FCNTL);
1601 break;
1602 default:
1603 dfprintk(MOUNT, "NFS: invalid "
1604 "local_lock argument\n");
1605 return 0;
1606 };
1607 break;
1608
1609 /*
1610 * Special options
1611 */
1612 case Opt_sloppy:
1613 sloppy = 1;
1614 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1615 break;
1616 case Opt_userspace:
1617 case Opt_deprecated:
1618 dfprintk(MOUNT, "NFS: ignoring mount option "
1619 "'%s'\n", p);
1620 break;
1621
1622 default:
1623 invalid_option = 1;
1624 dfprintk(MOUNT, "NFS: unrecognized mount option "
1625 "'%s'\n", p);
1626 }
1627 }
1628
1629 if (!sloppy && invalid_option)
1630 return 0;
1631
1632 if (mnt->minorversion && mnt->version != 4)
1633 goto out_minorversion_mismatch;
1634
1635 if (mnt->options & NFS_OPTION_MIGRATION &&
1636 (mnt->version != 4 || mnt->minorversion != 0))
1637 goto out_migration_misuse;
1638
1639 /*
1640 * verify that any proto=/mountproto= options match the address
1641 * families in the addr=/mountaddr= options.
1642 */
1643 if (protofamily != AF_UNSPEC &&
1644 protofamily != mnt->nfs_server.address.ss_family)
1645 goto out_proto_mismatch;
1646
1647 if (mountfamily != AF_UNSPEC) {
1648 if (mnt->mount_server.addrlen) {
1649 if (mountfamily != mnt->mount_server.address.ss_family)
1650 goto out_mountproto_mismatch;
1651 } else {
1652 if (mountfamily != mnt->nfs_server.address.ss_family)
1653 goto out_mountproto_mismatch;
1654 }
1655 }
1656
1657 return 1;
1658
1659 out_mountproto_mismatch:
1660 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1661 "option\n");
1662 return 0;
1663 out_proto_mismatch:
1664 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1665 return 0;
1666 out_invalid_address:
1667 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1668 return 0;
1669 out_invalid_value:
1670 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1671 return 0;
1672 out_minorversion_mismatch:
1673 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1674 "minorversion=%u\n", mnt->version, mnt->minorversion);
1675 return 0;
1676 out_migration_misuse:
1677 printk(KERN_INFO
1678 "NFS: 'migration' not supported for this NFS version\n");
1679 return 0;
1680 out_nomem:
1681 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1682 return 0;
1683 out_security_failure:
1684 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1685 return 0;
1686 }
1687
1688 /*
1689 * Ensure that a specified authtype in args->auth_info is supported by
1690 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1691 * -EACCES if not.
1692 */
1693 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1694 rpc_authflavor_t *server_authlist, unsigned int count)
1695 {
1696 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1697 bool found_auth_null = false;
1698 unsigned int i;
1699
1700 /*
1701 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1702 * must be in the list returned by the server.
1703 *
1704 * AUTH_NULL has a special meaning when it's in the server list - it
1705 * means that the server will ignore the rpc creds, so any flavor
1706 * can be used but still use the sec= that was specified.
1707 *
1708 * Note also that the MNT procedure in MNTv1 does not return a list
1709 * of supported security flavors. In this case, nfs_mount() fabricates
1710 * a security flavor list containing just AUTH_NULL.
1711 */
1712 for (i = 0; i < count; i++) {
1713 flavor = server_authlist[i];
1714
1715 if (nfs_auth_info_match(&args->auth_info, flavor))
1716 goto out;
1717
1718 if (flavor == RPC_AUTH_NULL)
1719 found_auth_null = true;
1720 }
1721
1722 if (found_auth_null) {
1723 flavor = args->auth_info.flavors[0];
1724 goto out;
1725 }
1726
1727 dfprintk(MOUNT,
1728 "NFS: specified auth flavors not supported by server\n");
1729 return -EACCES;
1730
1731 out:
1732 args->selected_flavor = flavor;
1733 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1734 return 0;
1735 }
1736
1737 /*
1738 * Use the remote server's MOUNT service to request the NFS file handle
1739 * corresponding to the provided path.
1740 */
1741 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1742 struct nfs_fh *root_fh,
1743 rpc_authflavor_t *server_authlist,
1744 unsigned int *server_authlist_len)
1745 {
1746 struct nfs_mount_request request = {
1747 .sap = (struct sockaddr *)
1748 &args->mount_server.address,
1749 .dirpath = args->nfs_server.export_path,
1750 .protocol = args->mount_server.protocol,
1751 .fh = root_fh,
1752 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1753 .auth_flav_len = server_authlist_len,
1754 .auth_flavs = server_authlist,
1755 .net = args->net,
1756 };
1757 int status;
1758
1759 if (args->mount_server.version == 0) {
1760 switch (args->version) {
1761 default:
1762 args->mount_server.version = NFS_MNT3_VERSION;
1763 break;
1764 case 2:
1765 args->mount_server.version = NFS_MNT_VERSION;
1766 }
1767 }
1768 request.version = args->mount_server.version;
1769
1770 if (args->mount_server.hostname)
1771 request.hostname = args->mount_server.hostname;
1772 else
1773 request.hostname = args->nfs_server.hostname;
1774
1775 /*
1776 * Construct the mount server's address.
1777 */
1778 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1779 memcpy(request.sap, &args->nfs_server.address,
1780 args->nfs_server.addrlen);
1781 args->mount_server.addrlen = args->nfs_server.addrlen;
1782 }
1783 request.salen = args->mount_server.addrlen;
1784 nfs_set_port(request.sap, &args->mount_server.port, 0);
1785
1786 /*
1787 * Now ask the mount server to map our export path
1788 * to a file handle.
1789 */
1790 status = nfs_mount(&request);
1791 if (status != 0) {
1792 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1793 request.hostname, status);
1794 return status;
1795 }
1796
1797 return 0;
1798 }
1799
1800 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1801 struct nfs_subversion *nfs_mod)
1802 {
1803 int status;
1804 unsigned int i;
1805 bool tried_auth_unix = false;
1806 bool auth_null_in_list = false;
1807 struct nfs_server *server = ERR_PTR(-EACCES);
1808 struct nfs_parsed_mount_data *args = mount_info->parsed;
1809 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1810 unsigned int authlist_len = ARRAY_SIZE(authlist);
1811
1812 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1813 &authlist_len);
1814 if (status)
1815 return ERR_PTR(status);
1816
1817 /*
1818 * Was a sec= authflavor specified in the options? First, verify
1819 * whether the server supports it, and then just try to use it if so.
1820 */
1821 if (args->auth_info.flavor_len > 0) {
1822 status = nfs_verify_authflavors(args, authlist, authlist_len);
1823 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1824 args->selected_flavor);
1825 if (status)
1826 return ERR_PTR(status);
1827 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1828 }
1829
1830 /*
1831 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1832 * SHOULD prefer the flavor listed first. However, some servers list
1833 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1834 */
1835 for (i = 0; i < authlist_len; ++i) {
1836 rpc_authflavor_t flavor;
1837 struct rpcsec_gss_info info;
1838
1839 flavor = authlist[i];
1840 switch (flavor) {
1841 case RPC_AUTH_UNIX:
1842 tried_auth_unix = true;
1843 break;
1844 case RPC_AUTH_NULL:
1845 auth_null_in_list = true;
1846 continue;
1847 default:
1848 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1849 continue;
1850 /* Fallthrough */
1851 }
1852 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1853 args->selected_flavor = flavor;
1854 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1855 if (!IS_ERR(server))
1856 return server;
1857 }
1858
1859 /*
1860 * Nothing we tried so far worked. At this point, give up if we've
1861 * already tried AUTH_UNIX or if the server's list doesn't contain
1862 * AUTH_NULL
1863 */
1864 if (tried_auth_unix || !auth_null_in_list)
1865 return server;
1866
1867 /* Last chance! Try AUTH_UNIX */
1868 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1869 args->selected_flavor = RPC_AUTH_UNIX;
1870 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1871 }
1872
1873 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1874 struct nfs_mount_info *mount_info,
1875 struct nfs_subversion *nfs_mod)
1876 {
1877 struct nfs_server *server;
1878
1879 if (mount_info->parsed->need_mount)
1880 server = nfs_try_mount_request(mount_info, nfs_mod);
1881 else
1882 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1883
1884 if (IS_ERR(server))
1885 return ERR_CAST(server);
1886
1887 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1888 }
1889 EXPORT_SYMBOL_GPL(nfs_try_mount);
1890
1891 /*
1892 * Split "dev_name" into "hostname:export_path".
1893 *
1894 * The leftmost colon demarks the split between the server's hostname
1895 * and the export path. If the hostname starts with a left square
1896 * bracket, then it may contain colons.
1897 *
1898 * Note: caller frees hostname and export path, even on error.
1899 */
1900 static int nfs_parse_devname(const char *dev_name,
1901 char **hostname, size_t maxnamlen,
1902 char **export_path, size_t maxpathlen)
1903 {
1904 size_t len;
1905 char *end;
1906
1907 if (unlikely(!dev_name || !*dev_name)) {
1908 dfprintk(MOUNT, "NFS: device name not specified\n");
1909 return -EINVAL;
1910 }
1911
1912 /* Is the host name protected with square brakcets? */
1913 if (*dev_name == '[') {
1914 end = strchr(++dev_name, ']');
1915 if (end == NULL || end[1] != ':')
1916 goto out_bad_devname;
1917
1918 len = end - dev_name;
1919 end++;
1920 } else {
1921 char *comma;
1922
1923 end = strchr(dev_name, ':');
1924 if (end == NULL)
1925 goto out_bad_devname;
1926 len = end - dev_name;
1927
1928 /* kill possible hostname list: not supported */
1929 comma = strchr(dev_name, ',');
1930 if (comma != NULL && comma < end)
1931 len = comma - dev_name;
1932 }
1933
1934 if (len > maxnamlen)
1935 goto out_hostname;
1936
1937 /* N.B. caller will free nfs_server.hostname in all cases */
1938 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1939 if (*hostname == NULL)
1940 goto out_nomem;
1941 len = strlen(++end);
1942 if (len > maxpathlen)
1943 goto out_path;
1944 *export_path = kstrndup(end, len, GFP_KERNEL);
1945 if (!*export_path)
1946 goto out_nomem;
1947
1948 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1949 return 0;
1950
1951 out_bad_devname:
1952 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1953 return -EINVAL;
1954
1955 out_nomem:
1956 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1957 return -ENOMEM;
1958
1959 out_hostname:
1960 dfprintk(MOUNT, "NFS: server hostname too long\n");
1961 return -ENAMETOOLONG;
1962
1963 out_path:
1964 dfprintk(MOUNT, "NFS: export pathname too long\n");
1965 return -ENAMETOOLONG;
1966 }
1967
1968 /*
1969 * Validate the NFS2/NFS3 mount data
1970 * - fills in the mount root filehandle
1971 *
1972 * For option strings, user space handles the following behaviors:
1973 *
1974 * + DNS: mapping server host name to IP address ("addr=" option)
1975 *
1976 * + failure mode: how to behave if a mount request can't be handled
1977 * immediately ("fg/bg" option)
1978 *
1979 * + retry: how often to retry a mount request ("retry=" option)
1980 *
1981 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1982 * mountproto=tcp after mountproto=udp, and so on
1983 */
1984 static int nfs23_validate_mount_data(void *options,
1985 struct nfs_parsed_mount_data *args,
1986 struct nfs_fh *mntfh,
1987 const char *dev_name)
1988 {
1989 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1990 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1991 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1992
1993 if (data == NULL)
1994 goto out_no_data;
1995
1996 args->version = NFS_DEFAULT_VERSION;
1997 switch (data->version) {
1998 case 1:
1999 data->namlen = 0; /* fall through */
2000 case 2:
2001 data->bsize = 0; /* fall through */
2002 case 3:
2003 if (data->flags & NFS_MOUNT_VER3)
2004 goto out_no_v3;
2005 data->root.size = NFS2_FHSIZE;
2006 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
2007 /* Turn off security negotiation */
2008 extra_flags |= NFS_MOUNT_SECFLAVOUR;
2009 /* fall through */
2010 case 4:
2011 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2012 goto out_no_sec;
2013 /* fall through */
2014 case 5:
2015 memset(data->context, 0, sizeof(data->context));
2016 /* fall through */
2017 case 6:
2018 if (data->flags & NFS_MOUNT_VER3) {
2019 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
2020 goto out_invalid_fh;
2021 mntfh->size = data->root.size;
2022 args->version = 3;
2023 } else {
2024 mntfh->size = NFS2_FHSIZE;
2025 args->version = 2;
2026 }
2027
2028
2029 memcpy(mntfh->data, data->root.data, mntfh->size);
2030 if (mntfh->size < sizeof(mntfh->data))
2031 memset(mntfh->data + mntfh->size, 0,
2032 sizeof(mntfh->data) - mntfh->size);
2033
2034 /*
2035 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2036 * can deal with.
2037 */
2038 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2039 args->flags |= extra_flags;
2040 args->rsize = data->rsize;
2041 args->wsize = data->wsize;
2042 args->timeo = data->timeo;
2043 args->retrans = data->retrans;
2044 args->acregmin = data->acregmin;
2045 args->acregmax = data->acregmax;
2046 args->acdirmin = data->acdirmin;
2047 args->acdirmax = data->acdirmax;
2048 args->need_mount = false;
2049
2050 memcpy(sap, &data->addr, sizeof(data->addr));
2051 args->nfs_server.addrlen = sizeof(data->addr);
2052 args->nfs_server.port = ntohs(data->addr.sin_port);
2053 if (sap->sa_family != AF_INET ||
2054 !nfs_verify_server_address(sap))
2055 goto out_no_address;
2056
2057 if (!(data->flags & NFS_MOUNT_TCP))
2058 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2059 /* N.B. caller will free nfs_server.hostname in all cases */
2060 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2061 args->namlen = data->namlen;
2062 args->bsize = data->bsize;
2063
2064 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2065 args->selected_flavor = data->pseudoflavor;
2066 else
2067 args->selected_flavor = RPC_AUTH_UNIX;
2068 if (!args->nfs_server.hostname)
2069 goto out_nomem;
2070
2071 if (!(data->flags & NFS_MOUNT_NONLM))
2072 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2073 NFS_MOUNT_LOCAL_FCNTL);
2074 else
2075 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2076 NFS_MOUNT_LOCAL_FCNTL);
2077 /*
2078 * The legacy version 6 binary mount data from userspace has a
2079 * field used only to transport selinux information into the
2080 * the kernel. To continue to support that functionality we
2081 * have a touch of selinux knowledge here in the NFS code. The
2082 * userspace code converted context=blah to just blah so we are
2083 * converting back to the full string selinux understands.
2084 */
2085 if (data->context[0]){
2086 #ifdef CONFIG_SECURITY_SELINUX
2087 int rc;
2088 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2089 rc = security_add_mnt_opt("context", data->context,
2090 strlen(data->context), &args->lsm_opts);
2091 if (rc)
2092 return rc;
2093 #else
2094 return -EINVAL;
2095 #endif
2096 }
2097
2098 break;
2099 default:
2100 return NFS_TEXT_DATA;
2101 }
2102
2103 return 0;
2104
2105 out_no_data:
2106 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2107 return -EINVAL;
2108
2109 out_no_v3:
2110 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2111 data->version);
2112 return -EINVAL;
2113
2114 out_no_sec:
2115 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2116 return -EINVAL;
2117
2118 out_nomem:
2119 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2120 return -ENOMEM;
2121
2122 out_no_address:
2123 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2124 return -EINVAL;
2125
2126 out_invalid_fh:
2127 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2128 return -EINVAL;
2129 }
2130
2131 #if IS_ENABLED(CONFIG_NFS_V4)
2132 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2133 void *options,
2134 struct nfs_parsed_mount_data *args,
2135 struct nfs_fh *mntfh,
2136 const char *dev_name)
2137 {
2138 if (fs_type == &nfs_fs_type)
2139 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2140 return nfs4_validate_mount_data(options, args, dev_name);
2141 }
2142 #else
2143 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2144 void *options,
2145 struct nfs_parsed_mount_data *args,
2146 struct nfs_fh *mntfh,
2147 const char *dev_name)
2148 {
2149 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2150 }
2151 #endif
2152
2153 static int nfs_validate_text_mount_data(void *options,
2154 struct nfs_parsed_mount_data *args,
2155 const char *dev_name)
2156 {
2157 int port = 0;
2158 int max_namelen = PAGE_SIZE;
2159 int max_pathlen = NFS_MAXPATHLEN;
2160 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2161
2162 if (nfs_parse_mount_options((char *)options, args) == 0)
2163 return -EINVAL;
2164
2165 if (!nfs_verify_server_address(sap))
2166 goto out_no_address;
2167
2168 if (args->version == 4) {
2169 #if IS_ENABLED(CONFIG_NFS_V4)
2170 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
2171 port = NFS_RDMA_PORT;
2172 else
2173 port = NFS_PORT;
2174 max_namelen = NFS4_MAXNAMLEN;
2175 max_pathlen = NFS4_MAXPATHLEN;
2176 nfs_validate_transport_protocol(args);
2177 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2178 goto out_invalid_transport_udp;
2179 nfs4_validate_mount_flags(args);
2180 #else
2181 goto out_v4_not_compiled;
2182 #endif /* CONFIG_NFS_V4 */
2183 } else {
2184 nfs_set_mount_transport_protocol(args);
2185 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
2186 port = NFS_RDMA_PORT;
2187 }
2188
2189 nfs_set_port(sap, &args->nfs_server.port, port);
2190
2191 return nfs_parse_devname(dev_name,
2192 &args->nfs_server.hostname,
2193 max_namelen,
2194 &args->nfs_server.export_path,
2195 max_pathlen);
2196
2197 #if !IS_ENABLED(CONFIG_NFS_V4)
2198 out_v4_not_compiled:
2199 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2200 return -EPROTONOSUPPORT;
2201 #else
2202 out_invalid_transport_udp:
2203 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2204 return -EINVAL;
2205 #endif /* !CONFIG_NFS_V4 */
2206
2207 out_no_address:
2208 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2209 return -EINVAL;
2210 }
2211
2212 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2213 | NFS_MOUNT_SECURE \
2214 | NFS_MOUNT_TCP \
2215 | NFS_MOUNT_VER3 \
2216 | NFS_MOUNT_KERBEROS \
2217 | NFS_MOUNT_NONLM \
2218 | NFS_MOUNT_BROKEN_SUID \
2219 | NFS_MOUNT_STRICTLOCK \
2220 | NFS_MOUNT_LEGACY_INTERFACE)
2221
2222 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2223 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2224
2225 static int
2226 nfs_compare_remount_data(struct nfs_server *nfss,
2227 struct nfs_parsed_mount_data *data)
2228 {
2229 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2230 data->rsize != nfss->rsize ||
2231 data->wsize != nfss->wsize ||
2232 data->version != nfss->nfs_client->rpc_ops->version ||
2233 data->minorversion != nfss->nfs_client->cl_minorversion ||
2234 data->retrans != nfss->client->cl_timeout->to_retries ||
2235 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2236 data->acregmin != nfss->acregmin / HZ ||
2237 data->acregmax != nfss->acregmax / HZ ||
2238 data->acdirmin != nfss->acdirmin / HZ ||
2239 data->acdirmax != nfss->acdirmax / HZ ||
2240 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2241 data->nfs_server.port != nfss->port ||
2242 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2243 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2244 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2245 return -EINVAL;
2246
2247 return 0;
2248 }
2249
2250 int
2251 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2252 {
2253 int error;
2254 struct nfs_server *nfss = sb->s_fs_info;
2255 struct nfs_parsed_mount_data *data;
2256 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2257 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2258 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2259
2260 sync_filesystem(sb);
2261
2262 /*
2263 * Userspace mount programs that send binary options generally send
2264 * them populated with default values. We have no way to know which
2265 * ones were explicitly specified. Fall back to legacy behavior and
2266 * just return success.
2267 */
2268 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2269 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2270 options->version <= 6))))
2271 return 0;
2272
2273 data = nfs_alloc_parsed_mount_data();
2274 if (data == NULL)
2275 return -ENOMEM;
2276
2277 /* fill out struct with values from existing mount */
2278 data->flags = nfss->flags;
2279 data->rsize = nfss->rsize;
2280 data->wsize = nfss->wsize;
2281 data->retrans = nfss->client->cl_timeout->to_retries;
2282 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2283 data->acregmin = nfss->acregmin / HZ;
2284 data->acregmax = nfss->acregmax / HZ;
2285 data->acdirmin = nfss->acdirmin / HZ;
2286 data->acdirmax = nfss->acdirmax / HZ;
2287 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2288 data->nfs_server.port = nfss->port;
2289 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2290 data->version = nfsvers;
2291 data->minorversion = nfss->nfs_client->cl_minorversion;
2292 data->net = current->nsproxy->net_ns;
2293 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2294 data->nfs_server.addrlen);
2295
2296 /* overwrite those values with any that were specified */
2297 error = -EINVAL;
2298 if (!nfs_parse_mount_options((char *)options, data))
2299 goto out;
2300
2301 /*
2302 * noac is a special case. It implies -o sync, but that's not
2303 * necessarily reflected in the mtab options. do_remount_sb
2304 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
2305 * remount options, so we have to explicitly reset it.
2306 */
2307 if (data->flags & NFS_MOUNT_NOAC)
2308 *flags |= SB_SYNCHRONOUS;
2309
2310 /* compare new mount options with old ones */
2311 error = nfs_compare_remount_data(nfss, data);
2312 if (!error)
2313 error = security_sb_remount(sb, data->lsm_opts);
2314 out:
2315 nfs_free_parsed_mount_data(data);
2316 return error;
2317 }
2318 EXPORT_SYMBOL_GPL(nfs_remount);
2319
2320 /*
2321 * Initialise the common bits of the superblock
2322 */
2323 static void nfs_initialise_sb(struct super_block *sb)
2324 {
2325 struct nfs_server *server = NFS_SB(sb);
2326
2327 sb->s_magic = NFS_SUPER_MAGIC;
2328
2329 /* We probably want something more informative here */
2330 snprintf(sb->s_id, sizeof(sb->s_id),
2331 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2332
2333 if (sb->s_blocksize == 0)
2334 sb->s_blocksize = nfs_block_bits(server->wsize,
2335 &sb->s_blocksize_bits);
2336
2337 nfs_super_set_maxbytes(sb, server->maxfilesize);
2338 }
2339
2340 /*
2341 * Finish setting up an NFS2/3 superblock
2342 */
2343 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2344 {
2345 struct nfs_parsed_mount_data *data = mount_info->parsed;
2346 struct nfs_server *server = NFS_SB(sb);
2347
2348 sb->s_blocksize_bits = 0;
2349 sb->s_blocksize = 0;
2350 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2351 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2352 if (data && data->bsize)
2353 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2354
2355 if (server->nfs_client->rpc_ops->version != 2) {
2356 /* The VFS shouldn't apply the umask to mode bits. We will do
2357 * so ourselves when necessary.
2358 */
2359 sb->s_flags |= SB_POSIXACL;
2360 sb->s_time_gran = 1;
2361 sb->s_export_op = &nfs_export_ops;
2362 }
2363
2364 nfs_initialise_sb(sb);
2365 }
2366 EXPORT_SYMBOL_GPL(nfs_fill_super);
2367
2368 /*
2369 * Finish setting up a cloned NFS2/3/4 superblock
2370 */
2371 static void nfs_clone_super(struct super_block *sb,
2372 struct nfs_mount_info *mount_info)
2373 {
2374 const struct super_block *old_sb = mount_info->cloned->sb;
2375 struct nfs_server *server = NFS_SB(sb);
2376
2377 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2378 sb->s_blocksize = old_sb->s_blocksize;
2379 sb->s_maxbytes = old_sb->s_maxbytes;
2380 sb->s_xattr = old_sb->s_xattr;
2381 sb->s_op = old_sb->s_op;
2382 sb->s_time_gran = 1;
2383 sb->s_export_op = old_sb->s_export_op;
2384
2385 if (server->nfs_client->rpc_ops->version != 2) {
2386 /* The VFS shouldn't apply the umask to mode bits. We will do
2387 * so ourselves when necessary.
2388 */
2389 sb->s_flags |= SB_POSIXACL;
2390 }
2391
2392 nfs_initialise_sb(sb);
2393 }
2394
2395 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2396 {
2397 const struct nfs_server *a = s->s_fs_info;
2398 const struct rpc_clnt *clnt_a = a->client;
2399 const struct rpc_clnt *clnt_b = b->client;
2400
2401 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2402 goto Ebusy;
2403 if (a->nfs_client != b->nfs_client)
2404 goto Ebusy;
2405 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2406 goto Ebusy;
2407 if (a->wsize != b->wsize)
2408 goto Ebusy;
2409 if (a->rsize != b->rsize)
2410 goto Ebusy;
2411 if (a->acregmin != b->acregmin)
2412 goto Ebusy;
2413 if (a->acregmax != b->acregmax)
2414 goto Ebusy;
2415 if (a->acdirmin != b->acdirmin)
2416 goto Ebusy;
2417 if (a->acdirmax != b->acdirmax)
2418 goto Ebusy;
2419 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2420 goto Ebusy;
2421 return 1;
2422 Ebusy:
2423 return 0;
2424 }
2425
2426 struct nfs_sb_mountdata {
2427 struct nfs_server *server;
2428 int mntflags;
2429 };
2430
2431 static int nfs_set_super(struct super_block *s, void *data)
2432 {
2433 struct nfs_sb_mountdata *sb_mntdata = data;
2434 struct nfs_server *server = sb_mntdata->server;
2435 int ret;
2436
2437 s->s_flags = sb_mntdata->mntflags;
2438 s->s_fs_info = server;
2439 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2440 ret = set_anon_super(s, server);
2441 if (ret == 0)
2442 server->s_dev = s->s_dev;
2443 return ret;
2444 }
2445
2446 static int nfs_compare_super_address(struct nfs_server *server1,
2447 struct nfs_server *server2)
2448 {
2449 struct sockaddr *sap1, *sap2;
2450 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
2451 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
2452
2453 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
2454 return 0;
2455
2456 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2457 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2458
2459 if (sap1->sa_family != sap2->sa_family)
2460 return 0;
2461
2462 switch (sap1->sa_family) {
2463 case AF_INET: {
2464 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2465 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2466 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2467 return 0;
2468 if (sin1->sin_port != sin2->sin_port)
2469 return 0;
2470 break;
2471 }
2472 case AF_INET6: {
2473 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2474 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2475 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2476 return 0;
2477 if (sin1->sin6_port != sin2->sin6_port)
2478 return 0;
2479 break;
2480 }
2481 default:
2482 return 0;
2483 }
2484
2485 return 1;
2486 }
2487
2488 static int nfs_compare_userns(const struct nfs_server *old,
2489 const struct nfs_server *new)
2490 {
2491 const struct user_namespace *oldns = &init_user_ns;
2492 const struct user_namespace *newns = &init_user_ns;
2493
2494 if (old->client && old->client->cl_cred)
2495 oldns = old->client->cl_cred->user_ns;
2496 if (new->client && new->client->cl_cred)
2497 newns = new->client->cl_cred->user_ns;
2498 if (oldns != newns)
2499 return 0;
2500 return 1;
2501 }
2502
2503 static int nfs_compare_super(struct super_block *sb, void *data)
2504 {
2505 struct nfs_sb_mountdata *sb_mntdata = data;
2506 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2507 int mntflags = sb_mntdata->mntflags;
2508
2509 if (!nfs_compare_super_address(old, server))
2510 return 0;
2511 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2512 if (old->flags & NFS_MOUNT_UNSHARED)
2513 return 0;
2514 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2515 return 0;
2516 if (!nfs_compare_userns(old, server))
2517 return 0;
2518 return nfs_compare_mount_options(sb, server, mntflags);
2519 }
2520
2521 #ifdef CONFIG_NFS_FSCACHE
2522 static void nfs_get_cache_cookie(struct super_block *sb,
2523 struct nfs_parsed_mount_data *parsed,
2524 struct nfs_clone_mount *cloned)
2525 {
2526 struct nfs_server *nfss = NFS_SB(sb);
2527 char *uniq = NULL;
2528 int ulen = 0;
2529
2530 nfss->fscache_key = NULL;
2531 nfss->fscache = NULL;
2532
2533 if (parsed) {
2534 if (!(parsed->options & NFS_OPTION_FSCACHE))
2535 return;
2536 if (parsed->fscache_uniq) {
2537 uniq = parsed->fscache_uniq;
2538 ulen = strlen(parsed->fscache_uniq);
2539 }
2540 } else if (cloned) {
2541 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2542 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2543 return;
2544 if (mnt_s->fscache_key) {
2545 uniq = mnt_s->fscache_key->key.uniquifier;
2546 ulen = mnt_s->fscache_key->key.uniq_len;
2547 };
2548 } else
2549 return;
2550
2551 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2552 }
2553 #else
2554 static void nfs_get_cache_cookie(struct super_block *sb,
2555 struct nfs_parsed_mount_data *parsed,
2556 struct nfs_clone_mount *cloned)
2557 {
2558 }
2559 #endif
2560
2561 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2562 struct nfs_mount_info *mount_info)
2563 {
2564 int error;
2565 unsigned long kflags = 0, kflags_out = 0;
2566 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2567 kflags |= SECURITY_LSM_NATIVE_LABELS;
2568
2569 error = security_sb_set_mnt_opts(s, mount_info->parsed->lsm_opts,
2570 kflags, &kflags_out);
2571 if (error)
2572 goto err;
2573
2574 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2575 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2576 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2577 err:
2578 return error;
2579 }
2580 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2581
2582 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2583 struct nfs_mount_info *mount_info)
2584 {
2585 int error;
2586 unsigned long kflags = 0, kflags_out = 0;
2587
2588 /* clone any lsm security options from the parent to the new sb */
2589 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2590 return -ESTALE;
2591
2592 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2593 kflags |= SECURITY_LSM_NATIVE_LABELS;
2594
2595 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags,
2596 &kflags_out);
2597 if (error)
2598 return error;
2599
2600 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2601 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2602 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2603 return 0;
2604 }
2605 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2606
2607 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2608 int flags, const char *dev_name,
2609 struct nfs_mount_info *mount_info,
2610 struct nfs_subversion *nfs_mod)
2611 {
2612 struct super_block *s;
2613 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2614 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2615 struct nfs_sb_mountdata sb_mntdata = {
2616 .mntflags = flags,
2617 .server = server,
2618 };
2619 int error;
2620
2621 if (server->flags & NFS_MOUNT_UNSHARED)
2622 compare_super = NULL;
2623
2624 /* -o noac implies -o sync */
2625 if (server->flags & NFS_MOUNT_NOAC)
2626 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2627
2628 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2629 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS)
2630 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2631
2632 /* Get a superblock - note that we may end up sharing one that already exists */
2633 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2634 if (IS_ERR(s)) {
2635 mntroot = ERR_CAST(s);
2636 goto out_err_nosb;
2637 }
2638
2639 if (s->s_fs_info != server) {
2640 nfs_free_server(server);
2641 server = NULL;
2642 } else {
2643 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
2644 MINOR(server->s_dev));
2645 if (error) {
2646 mntroot = ERR_PTR(error);
2647 goto error_splat_super;
2648 }
2649 s->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD;
2650 server->super = s;
2651 }
2652
2653 if (!s->s_root) {
2654 /* initial superblock/root creation */
2655 mount_info->fill_super(s, mount_info);
2656 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2657 if (!(server->flags & NFS_MOUNT_UNSHARED))
2658 s->s_iflags |= SB_I_MULTIROOT;
2659 }
2660
2661 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2662 if (IS_ERR(mntroot))
2663 goto error_splat_super;
2664
2665 error = mount_info->set_security(s, mntroot, mount_info);
2666 if (error)
2667 goto error_splat_root;
2668
2669 s->s_flags |= SB_ACTIVE;
2670
2671 out:
2672 return mntroot;
2673
2674 out_err_nosb:
2675 nfs_free_server(server);
2676 goto out;
2677
2678 error_splat_root:
2679 dput(mntroot);
2680 mntroot = ERR_PTR(error);
2681 error_splat_super:
2682 deactivate_locked_super(s);
2683 goto out;
2684 }
2685 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2686
2687 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2688 int flags, const char *dev_name, void *raw_data)
2689 {
2690 struct nfs_mount_info mount_info = {
2691 .fill_super = nfs_fill_super,
2692 .set_security = nfs_set_sb_security,
2693 };
2694 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2695 struct nfs_subversion *nfs_mod;
2696 int error;
2697
2698 mount_info.parsed = nfs_alloc_parsed_mount_data();
2699 mount_info.mntfh = nfs_alloc_fhandle();
2700 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2701 goto out;
2702
2703 /* Validate the mount data */
2704 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2705 if (error == NFS_TEXT_DATA)
2706 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2707 if (error < 0) {
2708 mntroot = ERR_PTR(error);
2709 goto out;
2710 }
2711
2712 nfs_mod = get_nfs_version(mount_info.parsed->version);
2713 if (IS_ERR(nfs_mod)) {
2714 mntroot = ERR_CAST(nfs_mod);
2715 goto out;
2716 }
2717
2718 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2719
2720 put_nfs_version(nfs_mod);
2721 out:
2722 nfs_free_parsed_mount_data(mount_info.parsed);
2723 nfs_free_fhandle(mount_info.mntfh);
2724 return mntroot;
2725 }
2726 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2727
2728 /*
2729 * Destroy an NFS2/3 superblock
2730 */
2731 void nfs_kill_super(struct super_block *s)
2732 {
2733 struct nfs_server *server = NFS_SB(s);
2734 dev_t dev = s->s_dev;
2735
2736 generic_shutdown_super(s);
2737
2738 nfs_fscache_release_super_cookie(s);
2739
2740 nfs_free_server(server);
2741 free_anon_bdev(dev);
2742 }
2743 EXPORT_SYMBOL_GPL(nfs_kill_super);
2744
2745 /*
2746 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2747 */
2748 static struct dentry *
2749 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2750 const char *dev_name, void *raw_data)
2751 {
2752 struct nfs_clone_mount *data = raw_data;
2753 struct nfs_mount_info mount_info = {
2754 .fill_super = nfs_clone_super,
2755 .set_security = nfs_clone_sb_security,
2756 .cloned = data,
2757 };
2758 struct nfs_server *server;
2759 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2760 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2761
2762 dprintk("--> nfs_xdev_mount()\n");
2763
2764 mount_info.mntfh = mount_info.cloned->fh;
2765
2766 /* create a new volume representation */
2767 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2768
2769 if (IS_ERR(server))
2770 mntroot = ERR_CAST(server);
2771 else
2772 mntroot = nfs_fs_mount_common(server, flags,
2773 dev_name, &mount_info, nfs_mod);
2774
2775 dprintk("<-- nfs_xdev_mount() = %ld\n",
2776 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2777 return mntroot;
2778 }
2779
2780 #if IS_ENABLED(CONFIG_NFS_V4)
2781
2782 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2783 {
2784 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2785 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2786 }
2787
2788 /*
2789 * Validate NFSv4 mount options
2790 */
2791 static int nfs4_validate_mount_data(void *options,
2792 struct nfs_parsed_mount_data *args,
2793 const char *dev_name)
2794 {
2795 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2796 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2797 char *c;
2798
2799 if (data == NULL)
2800 goto out_no_data;
2801
2802 args->version = 4;
2803
2804 switch (data->version) {
2805 case 1:
2806 if (data->host_addrlen > sizeof(args->nfs_server.address))
2807 goto out_no_address;
2808 if (data->host_addrlen == 0)
2809 goto out_no_address;
2810 args->nfs_server.addrlen = data->host_addrlen;
2811 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2812 return -EFAULT;
2813 if (!nfs_verify_server_address(sap))
2814 goto out_no_address;
2815 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2816
2817 if (data->auth_flavourlen) {
2818 rpc_authflavor_t pseudoflavor;
2819 if (data->auth_flavourlen > 1)
2820 goto out_inval_auth;
2821 if (copy_from_user(&pseudoflavor,
2822 data->auth_flavours,
2823 sizeof(pseudoflavor)))
2824 return -EFAULT;
2825 args->selected_flavor = pseudoflavor;
2826 } else
2827 args->selected_flavor = RPC_AUTH_UNIX;
2828
2829 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2830 if (IS_ERR(c))
2831 return PTR_ERR(c);
2832 args->nfs_server.hostname = c;
2833
2834 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2835 if (IS_ERR(c))
2836 return PTR_ERR(c);
2837 args->nfs_server.export_path = c;
2838 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2839
2840 c = strndup_user(data->client_addr.data, 16);
2841 if (IS_ERR(c))
2842 return PTR_ERR(c);
2843 args->client_address = c;
2844
2845 /*
2846 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2847 * can deal with.
2848 */
2849
2850 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2851 args->rsize = data->rsize;
2852 args->wsize = data->wsize;
2853 args->timeo = data->timeo;
2854 args->retrans = data->retrans;
2855 args->acregmin = data->acregmin;
2856 args->acregmax = data->acregmax;
2857 args->acdirmin = data->acdirmin;
2858 args->acdirmax = data->acdirmax;
2859 args->nfs_server.protocol = data->proto;
2860 nfs_validate_transport_protocol(args);
2861 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2862 goto out_invalid_transport_udp;
2863
2864 break;
2865 default:
2866 return NFS_TEXT_DATA;
2867 }
2868
2869 return 0;
2870
2871 out_no_data:
2872 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2873 return -EINVAL;
2874
2875 out_inval_auth:
2876 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2877 data->auth_flavourlen);
2878 return -EINVAL;
2879
2880 out_no_address:
2881 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2882 return -EINVAL;
2883
2884 out_invalid_transport_udp:
2885 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2886 return -EINVAL;
2887 }
2888
2889 /*
2890 * NFS v4 module parameters need to stay in the
2891 * NFS client for backwards compatibility
2892 */
2893 unsigned int nfs_callback_set_tcpport;
2894 unsigned short nfs_callback_nr_threads;
2895 /* Default cache timeout is 10 minutes */
2896 unsigned int nfs_idmap_cache_timeout = 600;
2897 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2898 bool nfs4_disable_idmapping = true;
2899 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2900 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
2901 unsigned short send_implementation_id = 1;
2902 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2903 bool recover_lost_locks = false;
2904
2905 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
2906 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2907 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2908 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2909 EXPORT_SYMBOL_GPL(max_session_slots);
2910 EXPORT_SYMBOL_GPL(max_session_cb_slots);
2911 EXPORT_SYMBOL_GPL(send_implementation_id);
2912 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2913 EXPORT_SYMBOL_GPL(recover_lost_locks);
2914
2915 #define NFS_CALLBACK_MAXPORTNR (65535U)
2916
2917 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2918 {
2919 unsigned long num;
2920 int ret;
2921
2922 if (!val)
2923 return -EINVAL;
2924 ret = kstrtoul(val, 0, &num);
2925 if (ret || num > NFS_CALLBACK_MAXPORTNR)
2926 return -EINVAL;
2927 *((unsigned int *)kp->arg) = num;
2928 return 0;
2929 }
2930 static const struct kernel_param_ops param_ops_portnr = {
2931 .set = param_set_portnr,
2932 .get = param_get_uint,
2933 };
2934 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2935
2936 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2937 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
2938 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
2939 "assigned to the NFSv4 callback channels.");
2940 module_param(nfs_idmap_cache_timeout, int, 0644);
2941 module_param(nfs4_disable_idmapping, bool, 0644);
2942 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2943 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2944 MODULE_PARM_DESC(nfs4_disable_idmapping,
2945 "Turn off NFSv4 idmapping when using 'sec=sys'");
2946 module_param(max_session_slots, ushort, 0644);
2947 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2948 "requests the client will negotiate");
2949 module_param(max_session_cb_slots, ushort, 0644);
2950 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
2951 "callbacks the client will process for a given server");
2952 module_param(send_implementation_id, ushort, 0644);
2953 MODULE_PARM_DESC(send_implementation_id,
2954 "Send implementation ID with NFSv4.1 exchange_id");
2955 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2956
2957 module_param(recover_lost_locks, bool, 0644);
2958 MODULE_PARM_DESC(recover_lost_locks,
2959 "If the server reports that a lock might be lost, "
2960 "try to recover it risking data corruption.");
2961
2962
2963 #endif /* CONFIG_NFS_V4 */
Linux with added FPC-III support