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staging: erofs: fix warning Comparison to bool
[linux/fpc-iii.git] / fs / nfs / super.c
blobf88ddac2dcdf3454d4df613f7fd675c8ca57fc37
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 enum {
81 /* Mount options that take no arguments */
82 Opt_soft, Opt_softerr, Opt_hard,
83 Opt_posix, Opt_noposix,
84 Opt_cto, Opt_nocto,
85 Opt_ac, Opt_noac,
86 Opt_lock, Opt_nolock,
87 Opt_udp, Opt_tcp, Opt_rdma,
88 Opt_acl, Opt_noacl,
89 Opt_rdirplus, Opt_nordirplus,
90 Opt_sharecache, Opt_nosharecache,
91 Opt_resvport, Opt_noresvport,
92 Opt_fscache, Opt_nofscache,
93 Opt_migration, Opt_nomigration,
94
95 /* Mount options that take integer arguments */
96 Opt_port,
97 Opt_rsize, Opt_wsize, Opt_bsize,
98 Opt_timeo, Opt_retrans,
99 Opt_acregmin, Opt_acregmax,
100 Opt_acdirmin, Opt_acdirmax,
101 Opt_actimeo,
102 Opt_namelen,
103 Opt_mountport,
104 Opt_mountvers,
105 Opt_minorversion,
106
107 /* Mount options that take string arguments */
108 Opt_nfsvers,
109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
111 Opt_lookupcache,
112 Opt_fscache_uniq,
113 Opt_local_lock,
114
115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
117
118 Opt_err
119 };
120
121 static const match_table_t nfs_mount_option_tokens = {
122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
124 { Opt_userspace, "retry=%s" },
125
126 { Opt_sloppy, "sloppy" },
127
128 { Opt_soft, "soft" },
129 { Opt_softerr, "softerr" },
130 { Opt_hard, "hard" },
131 { Opt_deprecated, "intr" },
132 { Opt_deprecated, "nointr" },
133 { Opt_posix, "posix" },
134 { Opt_noposix, "noposix" },
135 { Opt_cto, "cto" },
136 { Opt_nocto, "nocto" },
137 { Opt_ac, "ac" },
138 { Opt_noac, "noac" },
139 { Opt_lock, "lock" },
140 { Opt_nolock, "nolock" },
141 { Opt_udp, "udp" },
142 { Opt_tcp, "tcp" },
143 { Opt_rdma, "rdma" },
144 { Opt_acl, "acl" },
145 { Opt_noacl, "noacl" },
146 { Opt_rdirplus, "rdirplus" },
147 { Opt_nordirplus, "nordirplus" },
148 { Opt_sharecache, "sharecache" },
149 { Opt_nosharecache, "nosharecache" },
150 { Opt_resvport, "resvport" },
151 { Opt_noresvport, "noresvport" },
152 { Opt_fscache, "fsc" },
153 { Opt_nofscache, "nofsc" },
154 { Opt_migration, "migration" },
155 { Opt_nomigration, "nomigration" },
156
157 { Opt_port, "port=%s" },
158 { Opt_rsize, "rsize=%s" },
159 { Opt_wsize, "wsize=%s" },
160 { Opt_bsize, "bsize=%s" },
161 { Opt_timeo, "timeo=%s" },
162 { Opt_retrans, "retrans=%s" },
163 { Opt_acregmin, "acregmin=%s" },
164 { Opt_acregmax, "acregmax=%s" },
165 { Opt_acdirmin, "acdirmin=%s" },
166 { Opt_acdirmax, "acdirmax=%s" },
167 { Opt_actimeo, "actimeo=%s" },
168 { Opt_namelen, "namlen=%s" },
169 { Opt_mountport, "mountport=%s" },
170 { Opt_mountvers, "mountvers=%s" },
171 { Opt_minorversion, "minorversion=%s" },
172
173 { Opt_nfsvers, "nfsvers=%s" },
174 { Opt_nfsvers, "vers=%s" },
175
176 { Opt_sec, "sec=%s" },
177 { Opt_proto, "proto=%s" },
178 { Opt_mountproto, "mountproto=%s" },
179 { Opt_addr, "addr=%s" },
180 { Opt_clientaddr, "clientaddr=%s" },
181 { Opt_mounthost, "mounthost=%s" },
182 { Opt_mountaddr, "mountaddr=%s" },
183
184 { Opt_lookupcache, "lookupcache=%s" },
185 { Opt_fscache_uniq, "fsc=%s" },
186 { Opt_local_lock, "local_lock=%s" },
187
188 /* The following needs to be listed after all other options */
189 { Opt_nfsvers, "v%s" },
190
191 { Opt_err, NULL }
192 };
193
194 enum {
195 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
196 Opt_xprt_rdma6,
197
198 Opt_xprt_err
199 };
200
201 static const match_table_t nfs_xprt_protocol_tokens = {
202 { Opt_xprt_udp, "udp" },
203 { Opt_xprt_udp6, "udp6" },
204 { Opt_xprt_tcp, "tcp" },
205 { Opt_xprt_tcp6, "tcp6" },
206 { Opt_xprt_rdma, "rdma" },
207 { Opt_xprt_rdma6, "rdma6" },
208
209 { Opt_xprt_err, NULL }
210 };
211
212 enum {
213 Opt_sec_none, Opt_sec_sys,
214 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
215 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
216 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
217
218 Opt_sec_err
219 };
220
221 static const match_table_t nfs_secflavor_tokens = {
222 { Opt_sec_none, "none" },
223 { Opt_sec_none, "null" },
224 { Opt_sec_sys, "sys" },
225
226 { Opt_sec_krb5, "krb5" },
227 { Opt_sec_krb5i, "krb5i" },
228 { Opt_sec_krb5p, "krb5p" },
229
230 { Opt_sec_lkey, "lkey" },
231 { Opt_sec_lkeyi, "lkeyi" },
232 { Opt_sec_lkeyp, "lkeyp" },
233
234 { Opt_sec_spkm, "spkm3" },
235 { Opt_sec_spkmi, "spkm3i" },
236 { Opt_sec_spkmp, "spkm3p" },
237
238 { Opt_sec_err, NULL }
239 };
240
241 enum {
242 Opt_lookupcache_all, Opt_lookupcache_positive,
243 Opt_lookupcache_none,
244
245 Opt_lookupcache_err
246 };
247
248 static match_table_t nfs_lookupcache_tokens = {
249 { Opt_lookupcache_all, "all" },
250 { Opt_lookupcache_positive, "pos" },
251 { Opt_lookupcache_positive, "positive" },
252 { Opt_lookupcache_none, "none" },
253
254 { Opt_lookupcache_err, NULL }
255 };
256
257 enum {
258 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
259 Opt_local_lock_none,
260
261 Opt_local_lock_err
262 };
263
264 static match_table_t nfs_local_lock_tokens = {
265 { Opt_local_lock_all, "all" },
266 { Opt_local_lock_flock, "flock" },
267 { Opt_local_lock_posix, "posix" },
268 { Opt_local_lock_none, "none" },
269
270 { Opt_local_lock_err, NULL }
271 };
272
273 enum {
274 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
275 Opt_vers_4_1, Opt_vers_4_2,
276
277 Opt_vers_err
278 };
279
280 static match_table_t nfs_vers_tokens = {
281 { Opt_vers_2, "2" },
282 { Opt_vers_3, "3" },
283 { Opt_vers_4, "4" },
284 { Opt_vers_4_0, "4.0" },
285 { Opt_vers_4_1, "4.1" },
286 { Opt_vers_4_2, "4.2" },
287
288 { Opt_vers_err, NULL }
289 };
290
291 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
292 int flags, const char *dev_name, void *raw_data);
293
294 struct file_system_type nfs_fs_type = {
295 .owner = THIS_MODULE,
296 .name = "nfs",
297 .mount = nfs_fs_mount,
298 .kill_sb = nfs_kill_super,
299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
300 };
301 MODULE_ALIAS_FS("nfs");
302 EXPORT_SYMBOL_GPL(nfs_fs_type);
303
304 struct file_system_type nfs_xdev_fs_type = {
305 .owner = THIS_MODULE,
306 .name = "nfs",
307 .mount = nfs_xdev_mount,
308 .kill_sb = nfs_kill_super,
309 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
310 };
311
312 const struct super_operations nfs_sops = {
313 .alloc_inode = nfs_alloc_inode,
314 .free_inode = nfs_free_inode,
315 .write_inode = nfs_write_inode,
316 .drop_inode = nfs_drop_inode,
317 .statfs = nfs_statfs,
318 .evict_inode = nfs_evict_inode,
319 .umount_begin = nfs_umount_begin,
320 .show_options = nfs_show_options,
321 .show_devname = nfs_show_devname,
322 .show_path = nfs_show_path,
323 .show_stats = nfs_show_stats,
324 .remount_fs = nfs_remount,
325 };
326 EXPORT_SYMBOL_GPL(nfs_sops);
327
328 #if IS_ENABLED(CONFIG_NFS_V4)
329 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
330 static int nfs4_validate_mount_data(void *options,
331 struct nfs_parsed_mount_data *args, const char *dev_name);
332
333 struct file_system_type nfs4_fs_type = {
334 .owner = THIS_MODULE,
335 .name = "nfs4",
336 .mount = nfs_fs_mount,
337 .kill_sb = nfs_kill_super,
338 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
339 };
340 MODULE_ALIAS_FS("nfs4");
341 MODULE_ALIAS("nfs4");
342 EXPORT_SYMBOL_GPL(nfs4_fs_type);
343
344 static int __init register_nfs4_fs(void)
345 {
346 return register_filesystem(&nfs4_fs_type);
347 }
348
349 static void unregister_nfs4_fs(void)
350 {
351 unregister_filesystem(&nfs4_fs_type);
352 }
353 #else
354 static int __init register_nfs4_fs(void)
355 {
356 return 0;
357 }
358
359 static void unregister_nfs4_fs(void)
360 {
361 }
362 #endif
363
364 static struct shrinker acl_shrinker = {
365 .count_objects = nfs_access_cache_count,
366 .scan_objects = nfs_access_cache_scan,
367 .seeks = DEFAULT_SEEKS,
368 };
369
370 /*
371 * Register the NFS filesystems
372 */
373 int __init register_nfs_fs(void)
374 {
375 int ret;
376
377 ret = register_filesystem(&nfs_fs_type);
378 if (ret < 0)
379 goto error_0;
380
381 ret = register_nfs4_fs();
382 if (ret < 0)
383 goto error_1;
384
385 ret = nfs_register_sysctl();
386 if (ret < 0)
387 goto error_2;
388 ret = register_shrinker(&acl_shrinker);
389 if (ret < 0)
390 goto error_3;
391 return 0;
392 error_3:
393 nfs_unregister_sysctl();
394 error_2:
395 unregister_nfs4_fs();
396 error_1:
397 unregister_filesystem(&nfs_fs_type);
398 error_0:
399 return ret;
400 }
401
402 /*
403 * Unregister the NFS filesystems
404 */
405 void __exit unregister_nfs_fs(void)
406 {
407 unregister_shrinker(&acl_shrinker);
408 nfs_unregister_sysctl();
409 unregister_nfs4_fs();
410 unregister_filesystem(&nfs_fs_type);
411 }
412
413 bool nfs_sb_active(struct super_block *sb)
414 {
415 struct nfs_server *server = NFS_SB(sb);
416
417 if (!atomic_inc_not_zero(&sb->s_active))
418 return false;
419 if (atomic_inc_return(&server->active) != 1)
420 atomic_dec(&sb->s_active);
421 return true;
422 }
423 EXPORT_SYMBOL_GPL(nfs_sb_active);
424
425 void nfs_sb_deactive(struct super_block *sb)
426 {
427 struct nfs_server *server = NFS_SB(sb);
428
429 if (atomic_dec_and_test(&server->active))
430 deactivate_super(sb);
431 }
432 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
433
434 /*
435 * Deliver file system statistics to userspace
436 */
437 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
438 {
439 struct nfs_server *server = NFS_SB(dentry->d_sb);
440 unsigned char blockbits;
441 unsigned long blockres;
442 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
443 struct nfs_fsstat res;
444 int error = -ENOMEM;
445
446 res.fattr = nfs_alloc_fattr();
447 if (res.fattr == NULL)
448 goto out_err;
449
450 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
451 if (unlikely(error == -ESTALE)) {
452 struct dentry *pd_dentry;
453
454 pd_dentry = dget_parent(dentry);
455 if (pd_dentry != NULL) {
456 nfs_zap_caches(d_inode(pd_dentry));
457 dput(pd_dentry);
458 }
459 }
460 nfs_free_fattr(res.fattr);
461 if (error < 0)
462 goto out_err;
463
464 buf->f_type = NFS_SUPER_MAGIC;
465
466 /*
467 * Current versions of glibc do not correctly handle the
468 * case where f_frsize != f_bsize. Eventually we want to
469 * report the value of wtmult in this field.
470 */
471 buf->f_frsize = dentry->d_sb->s_blocksize;
472
473 /*
474 * On most *nix systems, f_blocks, f_bfree, and f_bavail
475 * are reported in units of f_frsize. Linux hasn't had
476 * an f_frsize field in its statfs struct until recently,
477 * thus historically Linux's sys_statfs reports these
478 * fields in units of f_bsize.
479 */
480 buf->f_bsize = dentry->d_sb->s_blocksize;
481 blockbits = dentry->d_sb->s_blocksize_bits;
482 blockres = (1 << blockbits) - 1;
483 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
484 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
485 buf->f_bavail = (res.abytes + blockres) >> blockbits;
486
487 buf->f_files = res.tfiles;
488 buf->f_ffree = res.afiles;
489
490 buf->f_namelen = server->namelen;
491
492 return 0;
493
494 out_err:
495 dprintk("%s: statfs error = %d\n", __func__, -error);
496 return error;
497 }
498 EXPORT_SYMBOL_GPL(nfs_statfs);
499
500 /*
501 * Map the security flavour number to a name
502 */
503 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
504 {
505 static const struct {
506 rpc_authflavor_t flavour;
507 const char *str;
508 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
509 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
510 { RPC_AUTH_NULL, "null" },
511 { RPC_AUTH_UNIX, "sys" },
512 { RPC_AUTH_GSS_KRB5, "krb5" },
513 { RPC_AUTH_GSS_KRB5I, "krb5i" },
514 { RPC_AUTH_GSS_KRB5P, "krb5p" },
515 { RPC_AUTH_GSS_LKEY, "lkey" },
516 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
517 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
518 { RPC_AUTH_GSS_SPKM, "spkm" },
519 { RPC_AUTH_GSS_SPKMI, "spkmi" },
520 { RPC_AUTH_GSS_SPKMP, "spkmp" },
521 { UINT_MAX, "unknown" }
522 };
523 int i;
524
525 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
526 if (sec_flavours[i].flavour == flavour)
527 break;
528 }
529 return sec_flavours[i].str;
530 }
531
532 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
533 int showdefaults)
534 {
535 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
536 char *proto = NULL;
537
538 switch (sap->sa_family) {
539 case AF_INET:
540 switch (nfss->mountd_protocol) {
541 case IPPROTO_UDP:
542 proto = RPCBIND_NETID_UDP;
543 break;
544 case IPPROTO_TCP:
545 proto = RPCBIND_NETID_TCP;
546 break;
547 }
548 break;
549 case AF_INET6:
550 switch (nfss->mountd_protocol) {
551 case IPPROTO_UDP:
552 proto = RPCBIND_NETID_UDP6;
553 break;
554 case IPPROTO_TCP:
555 proto = RPCBIND_NETID_TCP6;
556 break;
557 }
558 break;
559 }
560 if (proto || showdefaults)
561 seq_printf(m, ",mountproto=%s", proto ?: "auto");
562 }
563
564 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
565 int showdefaults)
566 {
567 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
568
569 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
570 return;
571
572 switch (sap->sa_family) {
573 case AF_INET: {
574 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
575 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
576 break;
577 }
578 case AF_INET6: {
579 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
580 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
581 break;
582 }
583 default:
584 if (showdefaults)
585 seq_printf(m, ",mountaddr=unspecified");
586 }
587
588 if (nfss->mountd_version || showdefaults)
589 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
590 if ((nfss->mountd_port &&
591 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
592 showdefaults)
593 seq_printf(m, ",mountport=%u", nfss->mountd_port);
594
595 nfs_show_mountd_netid(m, nfss, showdefaults);
596 }
597
598 #if IS_ENABLED(CONFIG_NFS_V4)
599 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
600 int showdefaults)
601 {
602 struct nfs_client *clp = nfss->nfs_client;
603
604 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
605 }
606 #else
607 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
608 int showdefaults)
609 {
610 }
611 #endif
612
613 static void nfs_show_nfs_version(struct seq_file *m,
614 unsigned int version,
615 unsigned int minorversion)
616 {
617 seq_printf(m, ",vers=%u", version);
618 if (version == 4)
619 seq_printf(m, ".%u", minorversion);
620 }
621
622 /*
623 * Describe the mount options in force on this server representation
624 */
625 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
626 int showdefaults)
627 {
628 static const struct proc_nfs_info {
629 int flag;
630 const char *str;
631 const char *nostr;
632 } nfs_info[] = {
633 { NFS_MOUNT_SOFT, ",soft", "" },
634 { NFS_MOUNT_SOFTERR, ",softerr", "" },
635 { NFS_MOUNT_POSIX, ",posix", "" },
636 { NFS_MOUNT_NOCTO, ",nocto", "" },
637 { NFS_MOUNT_NOAC, ",noac", "" },
638 { NFS_MOUNT_NONLM, ",nolock", "" },
639 { NFS_MOUNT_NOACL, ",noacl", "" },
640 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
641 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
642 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
643 { 0, NULL, NULL }
644 };
645 const struct proc_nfs_info *nfs_infop;
646 struct nfs_client *clp = nfss->nfs_client;
647 u32 version = clp->rpc_ops->version;
648 int local_flock, local_fcntl;
649
650 nfs_show_nfs_version(m, version, clp->cl_minorversion);
651 seq_printf(m, ",rsize=%u", nfss->rsize);
652 seq_printf(m, ",wsize=%u", nfss->wsize);
653 if (nfss->bsize != 0)
654 seq_printf(m, ",bsize=%u", nfss->bsize);
655 seq_printf(m, ",namlen=%u", nfss->namelen);
656 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
657 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
658 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
659 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
660 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
661 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
662 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
663 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
664 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
665 seq_puts(m, ",hard");
666 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
667 if (nfss->flags & nfs_infop->flag)
668 seq_puts(m, nfs_infop->str);
669 else
670 seq_puts(m, nfs_infop->nostr);
671 }
672 rcu_read_lock();
673 seq_printf(m, ",proto=%s",
674 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
675 rcu_read_unlock();
676 if (version == 4) {
677 if (nfss->port != NFS_PORT)
678 seq_printf(m, ",port=%u", nfss->port);
679 } else
680 if (nfss->port)
681 seq_printf(m, ",port=%u", nfss->port);
682
683 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
684 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
685 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
686
687 if (version != 4)
688 nfs_show_mountd_options(m, nfss, showdefaults);
689 else
690 nfs_show_nfsv4_options(m, nfss, showdefaults);
691
692 if (nfss->options & NFS_OPTION_FSCACHE)
693 seq_printf(m, ",fsc");
694
695 if (nfss->options & NFS_OPTION_MIGRATION)
696 seq_printf(m, ",migration");
697
698 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
699 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
700 seq_printf(m, ",lookupcache=none");
701 else
702 seq_printf(m, ",lookupcache=pos");
703 }
704
705 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
706 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
707
708 if (!local_flock && !local_fcntl)
709 seq_printf(m, ",local_lock=none");
710 else if (local_flock && local_fcntl)
711 seq_printf(m, ",local_lock=all");
712 else if (local_flock)
713 seq_printf(m, ",local_lock=flock");
714 else
715 seq_printf(m, ",local_lock=posix");
716 }
717
718 /*
719 * Describe the mount options on this VFS mountpoint
720 */
721 int nfs_show_options(struct seq_file *m, struct dentry *root)
722 {
723 struct nfs_server *nfss = NFS_SB(root->d_sb);
724
725 nfs_show_mount_options(m, nfss, 0);
726
727 rcu_read_lock();
728 seq_printf(m, ",addr=%s",
729 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
730 RPC_DISPLAY_ADDR));
731 rcu_read_unlock();
732
733 return 0;
734 }
735 EXPORT_SYMBOL_GPL(nfs_show_options);
736
737 #if IS_ENABLED(CONFIG_NFS_V4)
738 #ifdef CONFIG_NFS_V4_1
739 static void show_sessions(struct seq_file *m, struct nfs_server *server)
740 {
741 if (nfs4_has_session(server->nfs_client))
742 seq_printf(m, ",sessions");
743 }
744 #else
745 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
746 #endif
747 #endif
748
749 #ifdef CONFIG_NFS_V4_1
750 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
751 {
752 seq_printf(m, ",pnfs=");
753 if (server->pnfs_curr_ld)
754 seq_printf(m, "%s", server->pnfs_curr_ld->name);
755 else
756 seq_printf(m, "not configured");
757 }
758
759 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
760 {
761 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
762 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
763 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
764 "date='%llu,%u'",
765 impl_id->name, impl_id->domain,
766 impl_id->date.seconds, impl_id->date.nseconds);
767 }
768 }
769 #else
770 #if IS_ENABLED(CONFIG_NFS_V4)
771 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
772 {
773 }
774 #endif
775 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
776 {
777 }
778 #endif
779
780 int nfs_show_devname(struct seq_file *m, struct dentry *root)
781 {
782 char *page = (char *) __get_free_page(GFP_KERNEL);
783 char *devname, *dummy;
784 int err = 0;
785 if (!page)
786 return -ENOMEM;
787 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
788 if (IS_ERR(devname))
789 err = PTR_ERR(devname);
790 else
791 seq_escape(m, devname, " \t\n\\");
792 free_page((unsigned long)page);
793 return err;
794 }
795 EXPORT_SYMBOL_GPL(nfs_show_devname);
796
797 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
798 {
799 seq_puts(m, "/");
800 return 0;
801 }
802 EXPORT_SYMBOL_GPL(nfs_show_path);
803
804 /*
805 * Present statistical information for this VFS mountpoint
806 */
807 int nfs_show_stats(struct seq_file *m, struct dentry *root)
808 {
809 int i, cpu;
810 struct nfs_server *nfss = NFS_SB(root->d_sb);
811 struct rpc_auth *auth = nfss->client->cl_auth;
812 struct nfs_iostats totals = { };
813
814 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
815
816 /*
817 * Display all mount option settings
818 */
819 seq_printf(m, "\n\topts:\t");
820 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
821 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
822 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
823 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
824 nfs_show_mount_options(m, nfss, 1);
825
826 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
827
828 show_implementation_id(m, nfss);
829
830 seq_printf(m, "\n\tcaps:\t");
831 seq_printf(m, "caps=0x%x", nfss->caps);
832 seq_printf(m, ",wtmult=%u", nfss->wtmult);
833 seq_printf(m, ",dtsize=%u", nfss->dtsize);
834 seq_printf(m, ",bsize=%u", nfss->bsize);
835 seq_printf(m, ",namlen=%u", nfss->namelen);
836
837 #if IS_ENABLED(CONFIG_NFS_V4)
838 if (nfss->nfs_client->rpc_ops->version == 4) {
839 seq_printf(m, "\n\tnfsv4:\t");
840 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
841 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
842 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
843 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
844 show_sessions(m, nfss);
845 show_pnfs(m, nfss);
846 }
847 #endif
848
849 /*
850 * Display security flavor in effect for this mount
851 */
852 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
853 if (auth->au_flavor)
854 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
855
856 /*
857 * Display superblock I/O counters
858 */
859 for_each_possible_cpu(cpu) {
860 struct nfs_iostats *stats;
861
862 preempt_disable();
863 stats = per_cpu_ptr(nfss->io_stats, cpu);
864
865 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
866 totals.events[i] += stats->events[i];
867 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
868 totals.bytes[i] += stats->bytes[i];
869 #ifdef CONFIG_NFS_FSCACHE
870 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
871 totals.fscache[i] += stats->fscache[i];
872 #endif
873
874 preempt_enable();
875 }
876
877 seq_printf(m, "\n\tevents:\t");
878 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
879 seq_printf(m, "%lu ", totals.events[i]);
880 seq_printf(m, "\n\tbytes:\t");
881 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
882 seq_printf(m, "%Lu ", totals.bytes[i]);
883 #ifdef CONFIG_NFS_FSCACHE
884 if (nfss->options & NFS_OPTION_FSCACHE) {
885 seq_printf(m, "\n\tfsc:\t");
886 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
887 seq_printf(m, "%Lu ", totals.fscache[i]);
888 }
889 #endif
890 seq_printf(m, "\n");
891
892 rpc_clnt_show_stats(m, nfss->client);
893
894 return 0;
895 }
896 EXPORT_SYMBOL_GPL(nfs_show_stats);
897
898 /*
899 * Begin unmount by attempting to remove all automounted mountpoints we added
900 * in response to xdev traversals and referrals
901 */
902 void nfs_umount_begin(struct super_block *sb)
903 {
904 struct nfs_server *server;
905 struct rpc_clnt *rpc;
906
907 server = NFS_SB(sb);
908 /* -EIO all pending I/O */
909 rpc = server->client_acl;
910 if (!IS_ERR(rpc))
911 rpc_killall_tasks(rpc);
912 rpc = server->client;
913 if (!IS_ERR(rpc))
914 rpc_killall_tasks(rpc);
915 }
916 EXPORT_SYMBOL_GPL(nfs_umount_begin);
917
918 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
919 {
920 struct nfs_parsed_mount_data *data;
921
922 data = kzalloc(sizeof(*data), GFP_KERNEL);
923 if (data) {
924 data->timeo = NFS_UNSPEC_TIMEO;
925 data->retrans = NFS_UNSPEC_RETRANS;
926 data->acregmin = NFS_DEF_ACREGMIN;
927 data->acregmax = NFS_DEF_ACREGMAX;
928 data->acdirmin = NFS_DEF_ACDIRMIN;
929 data->acdirmax = NFS_DEF_ACDIRMAX;
930 data->mount_server.port = NFS_UNSPEC_PORT;
931 data->nfs_server.port = NFS_UNSPEC_PORT;
932 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
933 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
934 data->minorversion = 0;
935 data->need_mount = true;
936 data->net = current->nsproxy->net_ns;
937 data->lsm_opts = NULL;
938 }
939 return data;
940 }
941
942 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
943 {
944 if (data) {
945 kfree(data->client_address);
946 kfree(data->mount_server.hostname);
947 kfree(data->nfs_server.export_path);
948 kfree(data->nfs_server.hostname);
949 kfree(data->fscache_uniq);
950 security_free_mnt_opts(&data->lsm_opts);
951 kfree(data);
952 }
953 }
954
955 /*
956 * Sanity-check a server address provided by the mount command.
957 *
958 * Address family must be initialized, and address must not be
959 * the ANY address for that family.
960 */
961 static int nfs_verify_server_address(struct sockaddr *addr)
962 {
963 switch (addr->sa_family) {
964 case AF_INET: {
965 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
966 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
967 }
968 case AF_INET6: {
969 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
970 return !ipv6_addr_any(sa);
971 }
972 }
973
974 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
975 return 0;
976 }
977
978 /*
979 * Select between a default port value and a user-specified port value.
980 * If a zero value is set, then autobind will be used.
981 */
982 static void nfs_set_port(struct sockaddr *sap, int *port,
983 const unsigned short default_port)
984 {
985 if (*port == NFS_UNSPEC_PORT)
986 *port = default_port;
987
988 rpc_set_port(sap, *port);
989 }
990
991 /*
992 * Sanity check the NFS transport protocol.
993 *
994 */
995 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
996 {
997 switch (mnt->nfs_server.protocol) {
998 case XPRT_TRANSPORT_UDP:
999 case XPRT_TRANSPORT_TCP:
1000 case XPRT_TRANSPORT_RDMA:
1001 break;
1002 default:
1003 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1004 }
1005 }
1006
1007 /*
1008 * For text based NFSv2/v3 mounts, the mount protocol transport default
1009 * settings should depend upon the specified NFS transport.
1010 */
1011 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1012 {
1013 nfs_validate_transport_protocol(mnt);
1014
1015 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1016 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1017 return;
1018 switch (mnt->nfs_server.protocol) {
1019 case XPRT_TRANSPORT_UDP:
1020 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1021 break;
1022 case XPRT_TRANSPORT_TCP:
1023 case XPRT_TRANSPORT_RDMA:
1024 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1025 }
1026 }
1027
1028 /*
1029 * Add 'flavor' to 'auth_info' if not already present.
1030 * Returns true if 'flavor' ends up in the list, false otherwise
1031 */
1032 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1033 rpc_authflavor_t flavor)
1034 {
1035 unsigned int i;
1036 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1037
1038 /* make sure this flavor isn't already in the list */
1039 for (i = 0; i < auth_info->flavor_len; i++) {
1040 if (flavor == auth_info->flavors[i])
1041 return true;
1042 }
1043
1044 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1045 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1046 return false;
1047 }
1048
1049 auth_info->flavors[auth_info->flavor_len++] = flavor;
1050 return true;
1051 }
1052
1053 /*
1054 * Return true if 'match' is in auth_info or auth_info is empty.
1055 * Return false otherwise.
1056 */
1057 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1058 rpc_authflavor_t match)
1059 {
1060 int i;
1061
1062 if (!auth_info->flavor_len)
1063 return true;
1064
1065 for (i = 0; i < auth_info->flavor_len; i++) {
1066 if (auth_info->flavors[i] == match)
1067 return true;
1068 }
1069 return false;
1070 }
1071 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1072
1073 /*
1074 * Parse the value of the 'sec=' option.
1075 */
1076 static int nfs_parse_security_flavors(char *value,
1077 struct nfs_parsed_mount_data *mnt)
1078 {
1079 substring_t args[MAX_OPT_ARGS];
1080 rpc_authflavor_t pseudoflavor;
1081 char *p;
1082
1083 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1084
1085 while ((p = strsep(&value, ":")) != NULL) {
1086 switch (match_token(p, nfs_secflavor_tokens, args)) {
1087 case Opt_sec_none:
1088 pseudoflavor = RPC_AUTH_NULL;
1089 break;
1090 case Opt_sec_sys:
1091 pseudoflavor = RPC_AUTH_UNIX;
1092 break;
1093 case Opt_sec_krb5:
1094 pseudoflavor = RPC_AUTH_GSS_KRB5;
1095 break;
1096 case Opt_sec_krb5i:
1097 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1098 break;
1099 case Opt_sec_krb5p:
1100 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1101 break;
1102 case Opt_sec_lkey:
1103 pseudoflavor = RPC_AUTH_GSS_LKEY;
1104 break;
1105 case Opt_sec_lkeyi:
1106 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1107 break;
1108 case Opt_sec_lkeyp:
1109 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1110 break;
1111 case Opt_sec_spkm:
1112 pseudoflavor = RPC_AUTH_GSS_SPKM;
1113 break;
1114 case Opt_sec_spkmi:
1115 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1116 break;
1117 case Opt_sec_spkmp:
1118 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1119 break;
1120 default:
1121 dfprintk(MOUNT,
1122 "NFS: sec= option '%s' not recognized\n", p);
1123 return 0;
1124 }
1125
1126 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1127 return 0;
1128 }
1129
1130 return 1;
1131 }
1132
1133 static int nfs_parse_version_string(char *string,
1134 struct nfs_parsed_mount_data *mnt,
1135 substring_t *args)
1136 {
1137 mnt->flags &= ~NFS_MOUNT_VER3;
1138 switch (match_token(string, nfs_vers_tokens, args)) {
1139 case Opt_vers_2:
1140 mnt->version = 2;
1141 break;
1142 case Opt_vers_3:
1143 mnt->flags |= NFS_MOUNT_VER3;
1144 mnt->version = 3;
1145 break;
1146 case Opt_vers_4:
1147 /* Backward compatibility option. In future,
1148 * the mount program should always supply
1149 * a NFSv4 minor version number.
1150 */
1151 mnt->version = 4;
1152 break;
1153 case Opt_vers_4_0:
1154 mnt->version = 4;
1155 mnt->minorversion = 0;
1156 break;
1157 case Opt_vers_4_1:
1158 mnt->version = 4;
1159 mnt->minorversion = 1;
1160 break;
1161 case Opt_vers_4_2:
1162 mnt->version = 4;
1163 mnt->minorversion = 2;
1164 break;
1165 default:
1166 return 0;
1167 }
1168 return 1;
1169 }
1170
1171 static int nfs_get_option_str(substring_t args[], char **option)
1172 {
1173 kfree(*option);
1174 *option = match_strdup(args);
1175 return !*option;
1176 }
1177
1178 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1179 {
1180 int rc;
1181 char *string;
1182
1183 string = match_strdup(args);
1184 if (string == NULL)
1185 return -ENOMEM;
1186 rc = kstrtoul(string, 10, option);
1187 kfree(string);
1188
1189 return rc;
1190 }
1191
1192 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
1193 unsigned long l_bound, unsigned long u_bound)
1194 {
1195 int ret;
1196
1197 ret = nfs_get_option_ul(args, option);
1198 if (ret != 0)
1199 return ret;
1200 if (*option < l_bound || *option > u_bound)
1201 return -ERANGE;
1202 return 0;
1203 }
1204
1205 /*
1206 * Error-check and convert a string of mount options from user space into
1207 * a data structure. The whole mount string is processed; bad options are
1208 * skipped as they are encountered. If there were no errors, return 1;
1209 * otherwise return 0 (zero).
1210 */
1211 static int nfs_parse_mount_options(char *raw,
1212 struct nfs_parsed_mount_data *mnt)
1213 {
1214 char *p, *string;
1215 int rc, sloppy = 0, invalid_option = 0;
1216 unsigned short protofamily = AF_UNSPEC;
1217 unsigned short mountfamily = AF_UNSPEC;
1218
1219 if (!raw) {
1220 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1221 return 1;
1222 }
1223 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1224
1225 rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
1226 if (rc)
1227 goto out_security_failure;
1228
1229 while ((p = strsep(&raw, ",")) != NULL) {
1230 substring_t args[MAX_OPT_ARGS];
1231 unsigned long option;
1232 int token;
1233
1234 if (!*p)
1235 continue;
1236
1237 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1238
1239 token = match_token(p, nfs_mount_option_tokens, args);
1240 switch (token) {
1241
1242 /*
1243 * boolean options: foo/nofoo
1244 */
1245 case Opt_soft:
1246 mnt->flags |= NFS_MOUNT_SOFT;
1247 mnt->flags &= ~NFS_MOUNT_SOFTERR;
1248 break;
1249 case Opt_softerr:
1250 mnt->flags |= NFS_MOUNT_SOFTERR;
1251 mnt->flags &= ~NFS_MOUNT_SOFT;
1252 break;
1253 case Opt_hard:
1254 mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
1255 break;
1256 case Opt_posix:
1257 mnt->flags |= NFS_MOUNT_POSIX;
1258 break;
1259 case Opt_noposix:
1260 mnt->flags &= ~NFS_MOUNT_POSIX;
1261 break;
1262 case Opt_cto:
1263 mnt->flags &= ~NFS_MOUNT_NOCTO;
1264 break;
1265 case Opt_nocto:
1266 mnt->flags |= NFS_MOUNT_NOCTO;
1267 break;
1268 case Opt_ac:
1269 mnt->flags &= ~NFS_MOUNT_NOAC;
1270 break;
1271 case Opt_noac:
1272 mnt->flags |= NFS_MOUNT_NOAC;
1273 break;
1274 case Opt_lock:
1275 mnt->flags &= ~NFS_MOUNT_NONLM;
1276 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1277 NFS_MOUNT_LOCAL_FCNTL);
1278 break;
1279 case Opt_nolock:
1280 mnt->flags |= NFS_MOUNT_NONLM;
1281 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1282 NFS_MOUNT_LOCAL_FCNTL);
1283 break;
1284 case Opt_udp:
1285 mnt->flags &= ~NFS_MOUNT_TCP;
1286 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1287 break;
1288 case Opt_tcp:
1289 mnt->flags |= NFS_MOUNT_TCP;
1290 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1291 break;
1292 case Opt_rdma:
1293 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1294 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1295 xprt_load_transport(p);
1296 break;
1297 case Opt_acl:
1298 mnt->flags &= ~NFS_MOUNT_NOACL;
1299 break;
1300 case Opt_noacl:
1301 mnt->flags |= NFS_MOUNT_NOACL;
1302 break;
1303 case Opt_rdirplus:
1304 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1305 break;
1306 case Opt_nordirplus:
1307 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1308 break;
1309 case Opt_sharecache:
1310 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1311 break;
1312 case Opt_nosharecache:
1313 mnt->flags |= NFS_MOUNT_UNSHARED;
1314 break;
1315 case Opt_resvport:
1316 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1317 break;
1318 case Opt_noresvport:
1319 mnt->flags |= NFS_MOUNT_NORESVPORT;
1320 break;
1321 case Opt_fscache:
1322 mnt->options |= NFS_OPTION_FSCACHE;
1323 kfree(mnt->fscache_uniq);
1324 mnt->fscache_uniq = NULL;
1325 break;
1326 case Opt_nofscache:
1327 mnt->options &= ~NFS_OPTION_FSCACHE;
1328 kfree(mnt->fscache_uniq);
1329 mnt->fscache_uniq = NULL;
1330 break;
1331 case Opt_migration:
1332 mnt->options |= NFS_OPTION_MIGRATION;
1333 break;
1334 case Opt_nomigration:
1335 mnt->options &= ~NFS_OPTION_MIGRATION;
1336 break;
1337
1338 /*
1339 * options that take numeric values
1340 */
1341 case Opt_port:
1342 if (nfs_get_option_ul(args, &option) ||
1343 option > USHRT_MAX)
1344 goto out_invalid_value;
1345 mnt->nfs_server.port = option;
1346 break;
1347 case Opt_rsize:
1348 if (nfs_get_option_ul(args, &option))
1349 goto out_invalid_value;
1350 mnt->rsize = option;
1351 break;
1352 case Opt_wsize:
1353 if (nfs_get_option_ul(args, &option))
1354 goto out_invalid_value;
1355 mnt->wsize = option;
1356 break;
1357 case Opt_bsize:
1358 if (nfs_get_option_ul(args, &option))
1359 goto out_invalid_value;
1360 mnt->bsize = option;
1361 break;
1362 case Opt_timeo:
1363 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
1364 goto out_invalid_value;
1365 mnt->timeo = option;
1366 break;
1367 case Opt_retrans:
1368 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
1369 goto out_invalid_value;
1370 mnt->retrans = option;
1371 break;
1372 case Opt_acregmin:
1373 if (nfs_get_option_ul(args, &option))
1374 goto out_invalid_value;
1375 mnt->acregmin = option;
1376 break;
1377 case Opt_acregmax:
1378 if (nfs_get_option_ul(args, &option))
1379 goto out_invalid_value;
1380 mnt->acregmax = option;
1381 break;
1382 case Opt_acdirmin:
1383 if (nfs_get_option_ul(args, &option))
1384 goto out_invalid_value;
1385 mnt->acdirmin = option;
1386 break;
1387 case Opt_acdirmax:
1388 if (nfs_get_option_ul(args, &option))
1389 goto out_invalid_value;
1390 mnt->acdirmax = option;
1391 break;
1392 case Opt_actimeo:
1393 if (nfs_get_option_ul(args, &option))
1394 goto out_invalid_value;
1395 mnt->acregmin = mnt->acregmax =
1396 mnt->acdirmin = mnt->acdirmax = option;
1397 break;
1398 case Opt_namelen:
1399 if (nfs_get_option_ul(args, &option))
1400 goto out_invalid_value;
1401 mnt->namlen = option;
1402 break;
1403 case Opt_mountport:
1404 if (nfs_get_option_ul(args, &option) ||
1405 option > USHRT_MAX)
1406 goto out_invalid_value;
1407 mnt->mount_server.port = option;
1408 break;
1409 case Opt_mountvers:
1410 if (nfs_get_option_ul(args, &option) ||
1411 option < NFS_MNT_VERSION ||
1412 option > NFS_MNT3_VERSION)
1413 goto out_invalid_value;
1414 mnt->mount_server.version = option;
1415 break;
1416 case Opt_minorversion:
1417 if (nfs_get_option_ul(args, &option))
1418 goto out_invalid_value;
1419 if (option > NFS4_MAX_MINOR_VERSION)
1420 goto out_invalid_value;
1421 mnt->minorversion = option;
1422 break;
1423
1424 /*
1425 * options that take text values
1426 */
1427 case Opt_nfsvers:
1428 string = match_strdup(args);
1429 if (string == NULL)
1430 goto out_nomem;
1431 rc = nfs_parse_version_string(string, mnt, args);
1432 kfree(string);
1433 if (!rc)
1434 goto out_invalid_value;
1435 break;
1436 case Opt_sec:
1437 string = match_strdup(args);
1438 if (string == NULL)
1439 goto out_nomem;
1440 rc = nfs_parse_security_flavors(string, mnt);
1441 kfree(string);
1442 if (!rc) {
1443 dfprintk(MOUNT, "NFS: unrecognized "
1444 "security flavor\n");
1445 return 0;
1446 }
1447 break;
1448 case Opt_proto:
1449 string = match_strdup(args);
1450 if (string == NULL)
1451 goto out_nomem;
1452 token = match_token(string,
1453 nfs_xprt_protocol_tokens, args);
1454
1455 protofamily = AF_INET;
1456 switch (token) {
1457 case Opt_xprt_udp6:
1458 protofamily = AF_INET6;
1459 /* fall through */
1460 case Opt_xprt_udp:
1461 mnt->flags &= ~NFS_MOUNT_TCP;
1462 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1463 break;
1464 case Opt_xprt_tcp6:
1465 protofamily = AF_INET6;
1466 /* fall through */
1467 case Opt_xprt_tcp:
1468 mnt->flags |= NFS_MOUNT_TCP;
1469 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1470 break;
1471 case Opt_xprt_rdma6:
1472 protofamily = AF_INET6;
1473 /* fall through */
1474 case Opt_xprt_rdma:
1475 /* vector side protocols to TCP */
1476 mnt->flags |= NFS_MOUNT_TCP;
1477 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1478 xprt_load_transport(string);
1479 break;
1480 default:
1481 dfprintk(MOUNT, "NFS: unrecognized "
1482 "transport protocol\n");
1483 kfree(string);
1484 return 0;
1485 }
1486 kfree(string);
1487 break;
1488 case Opt_mountproto:
1489 string = match_strdup(args);
1490 if (string == NULL)
1491 goto out_nomem;
1492 token = match_token(string,
1493 nfs_xprt_protocol_tokens, args);
1494 kfree(string);
1495
1496 mountfamily = AF_INET;
1497 switch (token) {
1498 case Opt_xprt_udp6:
1499 mountfamily = AF_INET6;
1500 /* fall through */
1501 case Opt_xprt_udp:
1502 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1503 break;
1504 case Opt_xprt_tcp6:
1505 mountfamily = AF_INET6;
1506 /* fall through */
1507 case Opt_xprt_tcp:
1508 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1509 break;
1510 case Opt_xprt_rdma: /* not used for side protocols */
1511 default:
1512 dfprintk(MOUNT, "NFS: unrecognized "
1513 "transport protocol\n");
1514 return 0;
1515 }
1516 break;
1517 case Opt_addr:
1518 string = match_strdup(args);
1519 if (string == NULL)
1520 goto out_nomem;
1521 mnt->nfs_server.addrlen =
1522 rpc_pton(mnt->net, string, strlen(string),
1523 (struct sockaddr *)
1524 &mnt->nfs_server.address,
1525 sizeof(mnt->nfs_server.address));
1526 kfree(string);
1527 if (mnt->nfs_server.addrlen == 0)
1528 goto out_invalid_address;
1529 break;
1530 case Opt_clientaddr:
1531 if (nfs_get_option_str(args, &mnt->client_address))
1532 goto out_nomem;
1533 break;
1534 case Opt_mounthost:
1535 if (nfs_get_option_str(args,
1536 &mnt->mount_server.hostname))
1537 goto out_nomem;
1538 break;
1539 case Opt_mountaddr:
1540 string = match_strdup(args);
1541 if (string == NULL)
1542 goto out_nomem;
1543 mnt->mount_server.addrlen =
1544 rpc_pton(mnt->net, string, strlen(string),
1545 (struct sockaddr *)
1546 &mnt->mount_server.address,
1547 sizeof(mnt->mount_server.address));
1548 kfree(string);
1549 if (mnt->mount_server.addrlen == 0)
1550 goto out_invalid_address;
1551 break;
1552 case Opt_lookupcache:
1553 string = match_strdup(args);
1554 if (string == NULL)
1555 goto out_nomem;
1556 token = match_token(string,
1557 nfs_lookupcache_tokens, args);
1558 kfree(string);
1559 switch (token) {
1560 case Opt_lookupcache_all:
1561 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1562 break;
1563 case Opt_lookupcache_positive:
1564 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1565 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1566 break;
1567 case Opt_lookupcache_none:
1568 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1569 break;
1570 default:
1571 dfprintk(MOUNT, "NFS: invalid "
1572 "lookupcache argument\n");
1573 return 0;
1574 };
1575 break;
1576 case Opt_fscache_uniq:
1577 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1578 goto out_nomem;
1579 mnt->options |= NFS_OPTION_FSCACHE;
1580 break;
1581 case Opt_local_lock:
1582 string = match_strdup(args);
1583 if (string == NULL)
1584 goto out_nomem;
1585 token = match_token(string, nfs_local_lock_tokens,
1586 args);
1587 kfree(string);
1588 switch (token) {
1589 case Opt_local_lock_all:
1590 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1591 NFS_MOUNT_LOCAL_FCNTL);
1592 break;
1593 case Opt_local_lock_flock:
1594 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1595 break;
1596 case Opt_local_lock_posix:
1597 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1598 break;
1599 case Opt_local_lock_none:
1600 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1601 NFS_MOUNT_LOCAL_FCNTL);
1602 break;
1603 default:
1604 dfprintk(MOUNT, "NFS: invalid "
1605 "local_lock argument\n");
1606 return 0;
1607 };
1608 break;
1609
1610 /*
1611 * Special options
1612 */
1613 case Opt_sloppy:
1614 sloppy = 1;
1615 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1616 break;
1617 case Opt_userspace:
1618 case Opt_deprecated:
1619 dfprintk(MOUNT, "NFS: ignoring mount option "
1620 "'%s'\n", p);
1621 break;
1622
1623 default:
1624 invalid_option = 1;
1625 dfprintk(MOUNT, "NFS: unrecognized mount option "
1626 "'%s'\n", p);
1627 }
1628 }
1629
1630 if (!sloppy && invalid_option)
1631 return 0;
1632
1633 if (mnt->minorversion && mnt->version != 4)
1634 goto out_minorversion_mismatch;
1635
1636 if (mnt->options & NFS_OPTION_MIGRATION &&
1637 (mnt->version != 4 || mnt->minorversion != 0))
1638 goto out_migration_misuse;
1639
1640 /*
1641 * verify that any proto=/mountproto= options match the address
1642 * families in the addr=/mountaddr= options.
1643 */
1644 if (protofamily != AF_UNSPEC &&
1645 protofamily != mnt->nfs_server.address.ss_family)
1646 goto out_proto_mismatch;
1647
1648 if (mountfamily != AF_UNSPEC) {
1649 if (mnt->mount_server.addrlen) {
1650 if (mountfamily != mnt->mount_server.address.ss_family)
1651 goto out_mountproto_mismatch;
1652 } else {
1653 if (mountfamily != mnt->nfs_server.address.ss_family)
1654 goto out_mountproto_mismatch;
1655 }
1656 }
1657
1658 return 1;
1659
1660 out_mountproto_mismatch:
1661 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1662 "option\n");
1663 return 0;
1664 out_proto_mismatch:
1665 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1666 return 0;
1667 out_invalid_address:
1668 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1669 return 0;
1670 out_invalid_value:
1671 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1672 return 0;
1673 out_minorversion_mismatch:
1674 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1675 "minorversion=%u\n", mnt->version, mnt->minorversion);
1676 return 0;
1677 out_migration_misuse:
1678 printk(KERN_INFO
1679 "NFS: 'migration' not supported for this NFS version\n");
1680 return 0;
1681 out_nomem:
1682 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1683 return 0;
1684 out_security_failure:
1685 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1686 return 0;
1687 }
1688
1689 /*
1690 * Ensure that a specified authtype in args->auth_info is supported by
1691 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1692 * -EACCES if not.
1693 */
1694 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1695 rpc_authflavor_t *server_authlist, unsigned int count)
1696 {
1697 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1698 bool found_auth_null = false;
1699 unsigned int i;
1700
1701 /*
1702 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1703 * must be in the list returned by the server.
1704 *
1705 * AUTH_NULL has a special meaning when it's in the server list - it
1706 * means that the server will ignore the rpc creds, so any flavor
1707 * can be used but still use the sec= that was specified.
1708 *
1709 * Note also that the MNT procedure in MNTv1 does not return a list
1710 * of supported security flavors. In this case, nfs_mount() fabricates
1711 * a security flavor list containing just AUTH_NULL.
1712 */
1713 for (i = 0; i < count; i++) {
1714 flavor = server_authlist[i];
1715
1716 if (nfs_auth_info_match(&args->auth_info, flavor))
1717 goto out;
1718
1719 if (flavor == RPC_AUTH_NULL)
1720 found_auth_null = true;
1721 }
1722
1723 if (found_auth_null) {
1724 flavor = args->auth_info.flavors[0];
1725 goto out;
1726 }
1727
1728 dfprintk(MOUNT,
1729 "NFS: specified auth flavors not supported by server\n");
1730 return -EACCES;
1731
1732 out:
1733 args->selected_flavor = flavor;
1734 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1735 return 0;
1736 }
1737
1738 /*
1739 * Use the remote server's MOUNT service to request the NFS file handle
1740 * corresponding to the provided path.
1741 */
1742 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1743 struct nfs_fh *root_fh,
1744 rpc_authflavor_t *server_authlist,
1745 unsigned int *server_authlist_len)
1746 {
1747 struct nfs_mount_request request = {
1748 .sap = (struct sockaddr *)
1749 &args->mount_server.address,
1750 .dirpath = args->nfs_server.export_path,
1751 .protocol = args->mount_server.protocol,
1752 .fh = root_fh,
1753 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1754 .auth_flav_len = server_authlist_len,
1755 .auth_flavs = server_authlist,
1756 .net = args->net,
1757 };
1758 int status;
1759
1760 if (args->mount_server.version == 0) {
1761 switch (args->version) {
1762 default:
1763 args->mount_server.version = NFS_MNT3_VERSION;
1764 break;
1765 case 2:
1766 args->mount_server.version = NFS_MNT_VERSION;
1767 }
1768 }
1769 request.version = args->mount_server.version;
1770
1771 if (args->mount_server.hostname)
1772 request.hostname = args->mount_server.hostname;
1773 else
1774 request.hostname = args->nfs_server.hostname;
1775
1776 /*
1777 * Construct the mount server's address.
1778 */
1779 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1780 memcpy(request.sap, &args->nfs_server.address,
1781 args->nfs_server.addrlen);
1782 args->mount_server.addrlen = args->nfs_server.addrlen;
1783 }
1784 request.salen = args->mount_server.addrlen;
1785 nfs_set_port(request.sap, &args->mount_server.port, 0);
1786
1787 /*
1788 * Now ask the mount server to map our export path
1789 * to a file handle.
1790 */
1791 status = nfs_mount(&request);
1792 if (status != 0) {
1793 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1794 request.hostname, status);
1795 return status;
1796 }
1797
1798 return 0;
1799 }
1800
1801 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1802 struct nfs_subversion *nfs_mod)
1803 {
1804 int status;
1805 unsigned int i;
1806 bool tried_auth_unix = false;
1807 bool auth_null_in_list = false;
1808 struct nfs_server *server = ERR_PTR(-EACCES);
1809 struct nfs_parsed_mount_data *args = mount_info->parsed;
1810 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1811 unsigned int authlist_len = ARRAY_SIZE(authlist);
1812
1813 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1814 &authlist_len);
1815 if (status)
1816 return ERR_PTR(status);
1817
1818 /*
1819 * Was a sec= authflavor specified in the options? First, verify
1820 * whether the server supports it, and then just try to use it if so.
1821 */
1822 if (args->auth_info.flavor_len > 0) {
1823 status = nfs_verify_authflavors(args, authlist, authlist_len);
1824 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1825 args->selected_flavor);
1826 if (status)
1827 return ERR_PTR(status);
1828 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1829 }
1830
1831 /*
1832 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1833 * SHOULD prefer the flavor listed first. However, some servers list
1834 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1835 */
1836 for (i = 0; i < authlist_len; ++i) {
1837 rpc_authflavor_t flavor;
1838 struct rpcsec_gss_info info;
1839
1840 flavor = authlist[i];
1841 switch (flavor) {
1842 case RPC_AUTH_UNIX:
1843 tried_auth_unix = true;
1844 break;
1845 case RPC_AUTH_NULL:
1846 auth_null_in_list = true;
1847 continue;
1848 default:
1849 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1850 continue;
1851 /* Fallthrough */
1852 }
1853 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1854 args->selected_flavor = flavor;
1855 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1856 if (!IS_ERR(server))
1857 return server;
1858 }
1859
1860 /*
1861 * Nothing we tried so far worked. At this point, give up if we've
1862 * already tried AUTH_UNIX or if the server's list doesn't contain
1863 * AUTH_NULL
1864 */
1865 if (tried_auth_unix || !auth_null_in_list)
1866 return server;
1867
1868 /* Last chance! Try AUTH_UNIX */
1869 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1870 args->selected_flavor = RPC_AUTH_UNIX;
1871 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1872 }
1873
1874 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1875 struct nfs_mount_info *mount_info,
1876 struct nfs_subversion *nfs_mod)
1877 {
1878 struct nfs_server *server;
1879
1880 if (mount_info->parsed->need_mount)
1881 server = nfs_try_mount_request(mount_info, nfs_mod);
1882 else
1883 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1884
1885 if (IS_ERR(server))
1886 return ERR_CAST(server);
1887
1888 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1889 }
1890 EXPORT_SYMBOL_GPL(nfs_try_mount);
1891
1892 /*
1893 * Split "dev_name" into "hostname:export_path".
1894 *
1895 * The leftmost colon demarks the split between the server's hostname
1896 * and the export path. If the hostname starts with a left square
1897 * bracket, then it may contain colons.
1898 *
1899 * Note: caller frees hostname and export path, even on error.
1900 */
1901 static int nfs_parse_devname(const char *dev_name,
1902 char **hostname, size_t maxnamlen,
1903 char **export_path, size_t maxpathlen)
1904 {
1905 size_t len;
1906 char *end;
1907
1908 if (unlikely(!dev_name || !*dev_name)) {
1909 dfprintk(MOUNT, "NFS: device name not specified\n");
1910 return -EINVAL;
1911 }
1912
1913 /* Is the host name protected with square brakcets? */
1914 if (*dev_name == '[') {
1915 end = strchr(++dev_name, ']');
1916 if (end == NULL || end[1] != ':')
1917 goto out_bad_devname;
1918
1919 len = end - dev_name;
1920 end++;
1921 } else {
1922 char *comma;
1923
1924 end = strchr(dev_name, ':');
1925 if (end == NULL)
1926 goto out_bad_devname;
1927 len = end - dev_name;
1928
1929 /* kill possible hostname list: not supported */
1930 comma = strchr(dev_name, ',');
1931 if (comma != NULL && comma < end)
1932 len = comma - dev_name;
1933 }
1934
1935 if (len > maxnamlen)
1936 goto out_hostname;
1937
1938 /* N.B. caller will free nfs_server.hostname in all cases */
1939 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1940 if (*hostname == NULL)
1941 goto out_nomem;
1942 len = strlen(++end);
1943 if (len > maxpathlen)
1944 goto out_path;
1945 *export_path = kstrndup(end, len, GFP_KERNEL);
1946 if (!*export_path)
1947 goto out_nomem;
1948
1949 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1950 return 0;
1951
1952 out_bad_devname:
1953 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1954 return -EINVAL;
1955
1956 out_nomem:
1957 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1958 return -ENOMEM;
1959
1960 out_hostname:
1961 dfprintk(MOUNT, "NFS: server hostname too long\n");
1962 return -ENAMETOOLONG;
1963
1964 out_path:
1965 dfprintk(MOUNT, "NFS: export pathname too long\n");
1966 return -ENAMETOOLONG;
1967 }
1968
1969 /*
1970 * Validate the NFS2/NFS3 mount data
1971 * - fills in the mount root filehandle
1972 *
1973 * For option strings, user space handles the following behaviors:
1974 *
1975 * + DNS: mapping server host name to IP address ("addr=" option)
1976 *
1977 * + failure mode: how to behave if a mount request can't be handled
1978 * immediately ("fg/bg" option)
1979 *
1980 * + retry: how often to retry a mount request ("retry=" option)
1981 *
1982 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1983 * mountproto=tcp after mountproto=udp, and so on
1984 */
1985 static int nfs23_validate_mount_data(void *options,
1986 struct nfs_parsed_mount_data *args,
1987 struct nfs_fh *mntfh,
1988 const char *dev_name)
1989 {
1990 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1991 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1992 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1993
1994 if (data == NULL)
1995 goto out_no_data;
1996
1997 args->version = NFS_DEFAULT_VERSION;
1998 switch (data->version) {
1999 case 1:
2000 data->namlen = 0; /* fall through */
2001 case 2:
2002 data->bsize = 0; /* fall through */
2003 case 3:
2004 if (data->flags & NFS_MOUNT_VER3)
2005 goto out_no_v3;
2006 data->root.size = NFS2_FHSIZE;
2007 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
2008 /* Turn off security negotiation */
2009 extra_flags |= NFS_MOUNT_SECFLAVOUR;
2010 /* fall through */
2011 case 4:
2012 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2013 goto out_no_sec;
2014 /* fall through */
2015 case 5:
2016 memset(data->context, 0, sizeof(data->context));
2017 /* fall through */
2018 case 6:
2019 if (data->flags & NFS_MOUNT_VER3) {
2020 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
2021 goto out_invalid_fh;
2022 mntfh->size = data->root.size;
2023 args->version = 3;
2024 } else {
2025 mntfh->size = NFS2_FHSIZE;
2026 args->version = 2;
2027 }
2028
2029
2030 memcpy(mntfh->data, data->root.data, mntfh->size);
2031 if (mntfh->size < sizeof(mntfh->data))
2032 memset(mntfh->data + mntfh->size, 0,
2033 sizeof(mntfh->data) - mntfh->size);
2034
2035 /*
2036 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2037 * can deal with.
2038 */
2039 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2040 args->flags |= extra_flags;
2041 args->rsize = data->rsize;
2042 args->wsize = data->wsize;
2043 args->timeo = data->timeo;
2044 args->retrans = data->retrans;
2045 args->acregmin = data->acregmin;
2046 args->acregmax = data->acregmax;
2047 args->acdirmin = data->acdirmin;
2048 args->acdirmax = data->acdirmax;
2049 args->need_mount = false;
2050
2051 memcpy(sap, &data->addr, sizeof(data->addr));
2052 args->nfs_server.addrlen = sizeof(data->addr);
2053 args->nfs_server.port = ntohs(data->addr.sin_port);
2054 if (sap->sa_family != AF_INET ||
2055 !nfs_verify_server_address(sap))
2056 goto out_no_address;
2057
2058 if (!(data->flags & NFS_MOUNT_TCP))
2059 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2060 /* N.B. caller will free nfs_server.hostname in all cases */
2061 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2062 args->namlen = data->namlen;
2063 args->bsize = data->bsize;
2064
2065 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2066 args->selected_flavor = data->pseudoflavor;
2067 else
2068 args->selected_flavor = RPC_AUTH_UNIX;
2069 if (!args->nfs_server.hostname)
2070 goto out_nomem;
2071
2072 if (!(data->flags & NFS_MOUNT_NONLM))
2073 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2074 NFS_MOUNT_LOCAL_FCNTL);
2075 else
2076 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2077 NFS_MOUNT_LOCAL_FCNTL);
2078 /*
2079 * The legacy version 6 binary mount data from userspace has a
2080 * field used only to transport selinux information into the
2081 * the kernel. To continue to support that functionality we
2082 * have a touch of selinux knowledge here in the NFS code. The
2083 * userspace code converted context=blah to just blah so we are
2084 * converting back to the full string selinux understands.
2085 */
2086 if (data->context[0]){
2087 #ifdef CONFIG_SECURITY_SELINUX
2088 int rc;
2089 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2090 rc = security_add_mnt_opt("context", data->context,
2091 strlen(data->context), &args->lsm_opts);
2092 if (rc)
2093 return rc;
2094 #else
2095 return -EINVAL;
2096 #endif
2097 }
2098
2099 break;
2100 default:
2101 return NFS_TEXT_DATA;
2102 }
2103
2104 return 0;
2105
2106 out_no_data:
2107 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2108 return -EINVAL;
2109
2110 out_no_v3:
2111 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2112 data->version);
2113 return -EINVAL;
2114
2115 out_no_sec:
2116 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2117 return -EINVAL;
2118
2119 out_nomem:
2120 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2121 return -ENOMEM;
2122
2123 out_no_address:
2124 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2125 return -EINVAL;
2126
2127 out_invalid_fh:
2128 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2129 return -EINVAL;
2130 }
2131
2132 #if IS_ENABLED(CONFIG_NFS_V4)
2133 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2134 void *options,
2135 struct nfs_parsed_mount_data *args,
2136 struct nfs_fh *mntfh,
2137 const char *dev_name)
2138 {
2139 if (fs_type == &nfs_fs_type)
2140 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2141 return nfs4_validate_mount_data(options, args, dev_name);
2142 }
2143 #else
2144 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2145 void *options,
2146 struct nfs_parsed_mount_data *args,
2147 struct nfs_fh *mntfh,
2148 const char *dev_name)
2149 {
2150 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2151 }
2152 #endif
2153
2154 static int nfs_validate_text_mount_data(void *options,
2155 struct nfs_parsed_mount_data *args,
2156 const char *dev_name)
2157 {
2158 int port = 0;
2159 int max_namelen = PAGE_SIZE;
2160 int max_pathlen = NFS_MAXPATHLEN;
2161 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2162
2163 if (nfs_parse_mount_options((char *)options, args) == 0)
2164 return -EINVAL;
2165
2166 if (!nfs_verify_server_address(sap))
2167 goto out_no_address;
2168
2169 if (args->version == 4) {
2170 #if IS_ENABLED(CONFIG_NFS_V4)
2171 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
2172 port = NFS_RDMA_PORT;
2173 else
2174 port = NFS_PORT;
2175 max_namelen = NFS4_MAXNAMLEN;
2176 max_pathlen = NFS4_MAXPATHLEN;
2177 nfs_validate_transport_protocol(args);
2178 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2179 goto out_invalid_transport_udp;
2180 nfs4_validate_mount_flags(args);
2181 #else
2182 goto out_v4_not_compiled;
2183 #endif /* CONFIG_NFS_V4 */
2184 } else {
2185 nfs_set_mount_transport_protocol(args);
2186 if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
2187 port = NFS_RDMA_PORT;
2188 }
2189
2190 nfs_set_port(sap, &args->nfs_server.port, port);
2191
2192 return nfs_parse_devname(dev_name,
2193 &args->nfs_server.hostname,
2194 max_namelen,
2195 &args->nfs_server.export_path,
2196 max_pathlen);
2197
2198 #if !IS_ENABLED(CONFIG_NFS_V4)
2199 out_v4_not_compiled:
2200 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2201 return -EPROTONOSUPPORT;
2202 #else
2203 out_invalid_transport_udp:
2204 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2205 return -EINVAL;
2206 #endif /* !CONFIG_NFS_V4 */
2207
2208 out_no_address:
2209 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2210 return -EINVAL;
2211 }
2212
2213 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2214 | NFS_MOUNT_SECURE \
2215 | NFS_MOUNT_TCP \
2216 | NFS_MOUNT_VER3 \
2217 | NFS_MOUNT_KERBEROS \
2218 | NFS_MOUNT_NONLM \
2219 | NFS_MOUNT_BROKEN_SUID \
2220 | NFS_MOUNT_STRICTLOCK \
2221 | NFS_MOUNT_LEGACY_INTERFACE)
2222
2223 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2224 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2225
2226 static int
2227 nfs_compare_remount_data(struct nfs_server *nfss,
2228 struct nfs_parsed_mount_data *data)
2229 {
2230 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2231 data->rsize != nfss->rsize ||
2232 data->wsize != nfss->wsize ||
2233 data->version != nfss->nfs_client->rpc_ops->version ||
2234 data->minorversion != nfss->nfs_client->cl_minorversion ||
2235 data->retrans != nfss->client->cl_timeout->to_retries ||
2236 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2237 data->acregmin != nfss->acregmin / HZ ||
2238 data->acregmax != nfss->acregmax / HZ ||
2239 data->acdirmin != nfss->acdirmin / HZ ||
2240 data->acdirmax != nfss->acdirmax / HZ ||
2241 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2242 data->nfs_server.port != nfss->port ||
2243 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2244 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2245 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2246 return -EINVAL;
2247
2248 return 0;
2249 }
2250
2251 int
2252 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2253 {
2254 int error;
2255 struct nfs_server *nfss = sb->s_fs_info;
2256 struct nfs_parsed_mount_data *data;
2257 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2258 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2259 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2260
2261 sync_filesystem(sb);
2262
2263 /*
2264 * Userspace mount programs that send binary options generally send
2265 * them populated with default values. We have no way to know which
2266 * ones were explicitly specified. Fall back to legacy behavior and
2267 * just return success.
2268 */
2269 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2270 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2271 options->version <= 6))))
2272 return 0;
2273
2274 data = nfs_alloc_parsed_mount_data();
2275 if (data == NULL)
2276 return -ENOMEM;
2277
2278 /* fill out struct with values from existing mount */
2279 data->flags = nfss->flags;
2280 data->rsize = nfss->rsize;
2281 data->wsize = nfss->wsize;
2282 data->retrans = nfss->client->cl_timeout->to_retries;
2283 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2284 data->acregmin = nfss->acregmin / HZ;
2285 data->acregmax = nfss->acregmax / HZ;
2286 data->acdirmin = nfss->acdirmin / HZ;
2287 data->acdirmax = nfss->acdirmax / HZ;
2288 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2289 data->nfs_server.port = nfss->port;
2290 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2291 data->version = nfsvers;
2292 data->minorversion = nfss->nfs_client->cl_minorversion;
2293 data->net = current->nsproxy->net_ns;
2294 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2295 data->nfs_server.addrlen);
2296
2297 /* overwrite those values with any that were specified */
2298 error = -EINVAL;
2299 if (!nfs_parse_mount_options((char *)options, data))
2300 goto out;
2301
2302 /*
2303 * noac is a special case. It implies -o sync, but that's not
2304 * necessarily reflected in the mtab options. do_remount_sb
2305 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
2306 * remount options, so we have to explicitly reset it.
2307 */
2308 if (data->flags & NFS_MOUNT_NOAC)
2309 *flags |= SB_SYNCHRONOUS;
2310
2311 /* compare new mount options with old ones */
2312 error = nfs_compare_remount_data(nfss, data);
2313 if (!error)
2314 error = security_sb_remount(sb, data->lsm_opts);
2315 out:
2316 nfs_free_parsed_mount_data(data);
2317 return error;
2318 }
2319 EXPORT_SYMBOL_GPL(nfs_remount);
2320
2321 /*
2322 * Initialise the common bits of the superblock
2323 */
2324 static void nfs_initialise_sb(struct super_block *sb)
2325 {
2326 struct nfs_server *server = NFS_SB(sb);
2327
2328 sb->s_magic = NFS_SUPER_MAGIC;
2329
2330 /* We probably want something more informative here */
2331 snprintf(sb->s_id, sizeof(sb->s_id),
2332 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2333
2334 if (sb->s_blocksize == 0)
2335 sb->s_blocksize = nfs_block_bits(server->wsize,
2336 &sb->s_blocksize_bits);
2337
2338 nfs_super_set_maxbytes(sb, server->maxfilesize);
2339 }
2340
2341 /*
2342 * Finish setting up an NFS2/3 superblock
2343 */
2344 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2345 {
2346 struct nfs_parsed_mount_data *data = mount_info->parsed;
2347 struct nfs_server *server = NFS_SB(sb);
2348
2349 sb->s_blocksize_bits = 0;
2350 sb->s_blocksize = 0;
2351 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2352 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2353 if (data && data->bsize)
2354 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2355
2356 if (server->nfs_client->rpc_ops->version != 2) {
2357 /* The VFS shouldn't apply the umask to mode bits. We will do
2358 * so ourselves when necessary.
2359 */
2360 sb->s_flags |= SB_POSIXACL;
2361 sb->s_time_gran = 1;
2362 sb->s_export_op = &nfs_export_ops;
2363 }
2364
2365 nfs_initialise_sb(sb);
2366 }
2367 EXPORT_SYMBOL_GPL(nfs_fill_super);
2368
2369 /*
2370 * Finish setting up a cloned NFS2/3/4 superblock
2371 */
2372 static void nfs_clone_super(struct super_block *sb,
2373 struct nfs_mount_info *mount_info)
2374 {
2375 const struct super_block *old_sb = mount_info->cloned->sb;
2376 struct nfs_server *server = NFS_SB(sb);
2377
2378 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2379 sb->s_blocksize = old_sb->s_blocksize;
2380 sb->s_maxbytes = old_sb->s_maxbytes;
2381 sb->s_xattr = old_sb->s_xattr;
2382 sb->s_op = old_sb->s_op;
2383 sb->s_time_gran = 1;
2384 sb->s_export_op = old_sb->s_export_op;
2385
2386 if (server->nfs_client->rpc_ops->version != 2) {
2387 /* The VFS shouldn't apply the umask to mode bits. We will do
2388 * so ourselves when necessary.
2389 */
2390 sb->s_flags |= SB_POSIXACL;
2391 }
2392
2393 nfs_initialise_sb(sb);
2394 }
2395
2396 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2397 {
2398 const struct nfs_server *a = s->s_fs_info;
2399 const struct rpc_clnt *clnt_a = a->client;
2400 const struct rpc_clnt *clnt_b = b->client;
2401
2402 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2403 goto Ebusy;
2404 if (a->nfs_client != b->nfs_client)
2405 goto Ebusy;
2406 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2407 goto Ebusy;
2408 if (a->wsize != b->wsize)
2409 goto Ebusy;
2410 if (a->rsize != b->rsize)
2411 goto Ebusy;
2412 if (a->acregmin != b->acregmin)
2413 goto Ebusy;
2414 if (a->acregmax != b->acregmax)
2415 goto Ebusy;
2416 if (a->acdirmin != b->acdirmin)
2417 goto Ebusy;
2418 if (a->acdirmax != b->acdirmax)
2419 goto Ebusy;
2420 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2421 goto Ebusy;
2422 return 1;
2423 Ebusy:
2424 return 0;
2425 }
2426
2427 struct nfs_sb_mountdata {
2428 struct nfs_server *server;
2429 int mntflags;
2430 };
2431
2432 static int nfs_set_super(struct super_block *s, void *data)
2433 {
2434 struct nfs_sb_mountdata *sb_mntdata = data;
2435 struct nfs_server *server = sb_mntdata->server;
2436 int ret;
2437
2438 s->s_flags = sb_mntdata->mntflags;
2439 s->s_fs_info = server;
2440 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2441 ret = set_anon_super(s, server);
2442 if (ret == 0)
2443 server->s_dev = s->s_dev;
2444 return ret;
2445 }
2446
2447 static int nfs_compare_super_address(struct nfs_server *server1,
2448 struct nfs_server *server2)
2449 {
2450 struct sockaddr *sap1, *sap2;
2451 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
2452 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
2453
2454 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
2455 return 0;
2456
2457 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2458 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2459
2460 if (sap1->sa_family != sap2->sa_family)
2461 return 0;
2462
2463 switch (sap1->sa_family) {
2464 case AF_INET: {
2465 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2466 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2467 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2468 return 0;
2469 if (sin1->sin_port != sin2->sin_port)
2470 return 0;
2471 break;
2472 }
2473 case AF_INET6: {
2474 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2475 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2476 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2477 return 0;
2478 if (sin1->sin6_port != sin2->sin6_port)
2479 return 0;
2480 break;
2481 }
2482 default:
2483 return 0;
2484 }
2485
2486 return 1;
2487 }
2488
2489 static int nfs_compare_userns(const struct nfs_server *old,
2490 const struct nfs_server *new)
2491 {
2492 const struct user_namespace *oldns = &init_user_ns;
2493 const struct user_namespace *newns = &init_user_ns;
2494
2495 if (old->client && old->client->cl_cred)
2496 oldns = old->client->cl_cred->user_ns;
2497 if (new->client && new->client->cl_cred)
2498 newns = new->client->cl_cred->user_ns;
2499 if (oldns != newns)
2500 return 0;
2501 return 1;
2502 }
2503
2504 static int nfs_compare_super(struct super_block *sb, void *data)
2505 {
2506 struct nfs_sb_mountdata *sb_mntdata = data;
2507 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2508 int mntflags = sb_mntdata->mntflags;
2509
2510 if (!nfs_compare_super_address(old, server))
2511 return 0;
2512 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2513 if (old->flags & NFS_MOUNT_UNSHARED)
2514 return 0;
2515 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2516 return 0;
2517 if (!nfs_compare_userns(old, server))
2518 return 0;
2519 return nfs_compare_mount_options(sb, server, mntflags);
2520 }
2521
2522 #ifdef CONFIG_NFS_FSCACHE
2523 static void nfs_get_cache_cookie(struct super_block *sb,
2524 struct nfs_parsed_mount_data *parsed,
2525 struct nfs_clone_mount *cloned)
2526 {
2527 struct nfs_server *nfss = NFS_SB(sb);
2528 char *uniq = NULL;
2529 int ulen = 0;
2530
2531 nfss->fscache_key = NULL;
2532 nfss->fscache = NULL;
2533
2534 if (parsed) {
2535 if (!(parsed->options & NFS_OPTION_FSCACHE))
2536 return;
2537 if (parsed->fscache_uniq) {
2538 uniq = parsed->fscache_uniq;
2539 ulen = strlen(parsed->fscache_uniq);
2540 }
2541 } else if (cloned) {
2542 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2543 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2544 return;
2545 if (mnt_s->fscache_key) {
2546 uniq = mnt_s->fscache_key->key.uniquifier;
2547 ulen = mnt_s->fscache_key->key.uniq_len;
2548 };
2549 } else
2550 return;
2551
2552 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2553 }
2554 #else
2555 static void nfs_get_cache_cookie(struct super_block *sb,
2556 struct nfs_parsed_mount_data *parsed,
2557 struct nfs_clone_mount *cloned)
2558 {
2559 }
2560 #endif
2561
2562 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2563 struct nfs_mount_info *mount_info)
2564 {
2565 int error;
2566 unsigned long kflags = 0, kflags_out = 0;
2567 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2568 kflags |= SECURITY_LSM_NATIVE_LABELS;
2569
2570 error = security_sb_set_mnt_opts(s, mount_info->parsed->lsm_opts,
2571 kflags, &kflags_out);
2572 if (error)
2573 goto err;
2574
2575 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2576 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2577 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2578 err:
2579 return error;
2580 }
2581 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2582
2583 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2584 struct nfs_mount_info *mount_info)
2585 {
2586 int error;
2587 unsigned long kflags = 0, kflags_out = 0;
2588
2589 /* clone any lsm security options from the parent to the new sb */
2590 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2591 return -ESTALE;
2592
2593 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2594 kflags |= SECURITY_LSM_NATIVE_LABELS;
2595
2596 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags,
2597 &kflags_out);
2598 if (error)
2599 return error;
2600
2601 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2602 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2603 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2604 return 0;
2605 }
2606 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2607
2608 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2609 int flags, const char *dev_name,
2610 struct nfs_mount_info *mount_info,
2611 struct nfs_subversion *nfs_mod)
2612 {
2613 struct super_block *s;
2614 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2615 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2616 struct nfs_sb_mountdata sb_mntdata = {
2617 .mntflags = flags,
2618 .server = server,
2619 };
2620 int error;
2621
2622 if (server->flags & NFS_MOUNT_UNSHARED)
2623 compare_super = NULL;
2624
2625 /* -o noac implies -o sync */
2626 if (server->flags & NFS_MOUNT_NOAC)
2627 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2628
2629 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2630 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS)
2631 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2632
2633 /* Get a superblock - note that we may end up sharing one that already exists */
2634 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2635 if (IS_ERR(s)) {
2636 mntroot = ERR_CAST(s);
2637 goto out_err_nosb;
2638 }
2639
2640 if (s->s_fs_info != server) {
2641 nfs_free_server(server);
2642 server = NULL;
2643 } else {
2644 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
2645 MINOR(server->s_dev));
2646 if (error) {
2647 mntroot = ERR_PTR(error);
2648 goto error_splat_super;
2649 }
2650 s->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD;
2651 server->super = s;
2652 }
2653
2654 if (!s->s_root) {
2655 /* initial superblock/root creation */
2656 mount_info->fill_super(s, mount_info);
2657 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2658 if (!(server->flags & NFS_MOUNT_UNSHARED))
2659 s->s_iflags |= SB_I_MULTIROOT;
2660 }
2661
2662 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2663 if (IS_ERR(mntroot))
2664 goto error_splat_super;
2665
2666 error = mount_info->set_security(s, mntroot, mount_info);
2667 if (error)
2668 goto error_splat_root;
2669
2670 s->s_flags |= SB_ACTIVE;
2671
2672 out:
2673 return mntroot;
2674
2675 out_err_nosb:
2676 nfs_free_server(server);
2677 goto out;
2678
2679 error_splat_root:
2680 dput(mntroot);
2681 mntroot = ERR_PTR(error);
2682 error_splat_super:
2683 deactivate_locked_super(s);
2684 goto out;
2685 }
2686 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2687
2688 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2689 int flags, const char *dev_name, void *raw_data)
2690 {
2691 struct nfs_mount_info mount_info = {
2692 .fill_super = nfs_fill_super,
2693 .set_security = nfs_set_sb_security,
2694 };
2695 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2696 struct nfs_subversion *nfs_mod;
2697 int error;
2698
2699 mount_info.parsed = nfs_alloc_parsed_mount_data();
2700 mount_info.mntfh = nfs_alloc_fhandle();
2701 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2702 goto out;
2703
2704 /* Validate the mount data */
2705 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2706 if (error == NFS_TEXT_DATA)
2707 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2708 if (error < 0) {
2709 mntroot = ERR_PTR(error);
2710 goto out;
2711 }
2712
2713 nfs_mod = get_nfs_version(mount_info.parsed->version);
2714 if (IS_ERR(nfs_mod)) {
2715 mntroot = ERR_CAST(nfs_mod);
2716 goto out;
2717 }
2718
2719 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2720
2721 put_nfs_version(nfs_mod);
2722 out:
2723 nfs_free_parsed_mount_data(mount_info.parsed);
2724 nfs_free_fhandle(mount_info.mntfh);
2725 return mntroot;
2726 }
2727 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2728
2729 /*
2730 * Destroy an NFS2/3 superblock
2731 */
2732 void nfs_kill_super(struct super_block *s)
2733 {
2734 struct nfs_server *server = NFS_SB(s);
2735 dev_t dev = s->s_dev;
2736
2737 generic_shutdown_super(s);
2738
2739 nfs_fscache_release_super_cookie(s);
2740
2741 nfs_free_server(server);
2742 free_anon_bdev(dev);
2743 }
2744 EXPORT_SYMBOL_GPL(nfs_kill_super);
2745
2746 /*
2747 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2748 */
2749 static struct dentry *
2750 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2751 const char *dev_name, void *raw_data)
2752 {
2753 struct nfs_clone_mount *data = raw_data;
2754 struct nfs_mount_info mount_info = {
2755 .fill_super = nfs_clone_super,
2756 .set_security = nfs_clone_sb_security,
2757 .cloned = data,
2758 };
2759 struct nfs_server *server;
2760 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2761 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2762
2763 dprintk("--> nfs_xdev_mount()\n");
2764
2765 mount_info.mntfh = mount_info.cloned->fh;
2766
2767 /* create a new volume representation */
2768 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2769
2770 if (IS_ERR(server))
2771 mntroot = ERR_CAST(server);
2772 else
2773 mntroot = nfs_fs_mount_common(server, flags,
2774 dev_name, &mount_info, nfs_mod);
2775
2776 dprintk("<-- nfs_xdev_mount() = %ld\n",
2777 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2778 return mntroot;
2779 }
2780
2781 #if IS_ENABLED(CONFIG_NFS_V4)
2782
2783 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2784 {
2785 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2786 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2787 }
2788
2789 /*
2790 * Validate NFSv4 mount options
2791 */
2792 static int nfs4_validate_mount_data(void *options,
2793 struct nfs_parsed_mount_data *args,
2794 const char *dev_name)
2795 {
2796 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2797 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2798 char *c;
2799
2800 if (data == NULL)
2801 goto out_no_data;
2802
2803 args->version = 4;
2804
2805 switch (data->version) {
2806 case 1:
2807 if (data->host_addrlen > sizeof(args->nfs_server.address))
2808 goto out_no_address;
2809 if (data->host_addrlen == 0)
2810 goto out_no_address;
2811 args->nfs_server.addrlen = data->host_addrlen;
2812 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2813 return -EFAULT;
2814 if (!nfs_verify_server_address(sap))
2815 goto out_no_address;
2816 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2817
2818 if (data->auth_flavourlen) {
2819 rpc_authflavor_t pseudoflavor;
2820 if (data->auth_flavourlen > 1)
2821 goto out_inval_auth;
2822 if (copy_from_user(&pseudoflavor,
2823 data->auth_flavours,
2824 sizeof(pseudoflavor)))
2825 return -EFAULT;
2826 args->selected_flavor = pseudoflavor;
2827 } else
2828 args->selected_flavor = RPC_AUTH_UNIX;
2829
2830 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2831 if (IS_ERR(c))
2832 return PTR_ERR(c);
2833 args->nfs_server.hostname = c;
2834
2835 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2836 if (IS_ERR(c))
2837 return PTR_ERR(c);
2838 args->nfs_server.export_path = c;
2839 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2840
2841 c = strndup_user(data->client_addr.data, 16);
2842 if (IS_ERR(c))
2843 return PTR_ERR(c);
2844 args->client_address = c;
2845
2846 /*
2847 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2848 * can deal with.
2849 */
2850
2851 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2852 args->rsize = data->rsize;
2853 args->wsize = data->wsize;
2854 args->timeo = data->timeo;
2855 args->retrans = data->retrans;
2856 args->acregmin = data->acregmin;
2857 args->acregmax = data->acregmax;
2858 args->acdirmin = data->acdirmin;
2859 args->acdirmax = data->acdirmax;
2860 args->nfs_server.protocol = data->proto;
2861 nfs_validate_transport_protocol(args);
2862 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2863 goto out_invalid_transport_udp;
2864
2865 break;
2866 default:
2867 return NFS_TEXT_DATA;
2868 }
2869
2870 return 0;
2871
2872 out_no_data:
2873 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2874 return -EINVAL;
2875
2876 out_inval_auth:
2877 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2878 data->auth_flavourlen);
2879 return -EINVAL;
2880
2881 out_no_address:
2882 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2883 return -EINVAL;
2884
2885 out_invalid_transport_udp:
2886 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2887 return -EINVAL;
2888 }
2889
2890 /*
2891 * NFS v4 module parameters need to stay in the
2892 * NFS client for backwards compatibility
2893 */
2894 unsigned int nfs_callback_set_tcpport;
2895 unsigned short nfs_callback_nr_threads;
2896 /* Default cache timeout is 10 minutes */
2897 unsigned int nfs_idmap_cache_timeout = 600;
2898 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2899 bool nfs4_disable_idmapping = true;
2900 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2901 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
2902 unsigned short send_implementation_id = 1;
2903 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2904 bool recover_lost_locks = false;
2905
2906 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
2907 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2908 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2909 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2910 EXPORT_SYMBOL_GPL(max_session_slots);
2911 EXPORT_SYMBOL_GPL(max_session_cb_slots);
2912 EXPORT_SYMBOL_GPL(send_implementation_id);
2913 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2914 EXPORT_SYMBOL_GPL(recover_lost_locks);
2915
2916 #define NFS_CALLBACK_MAXPORTNR (65535U)
2917
2918 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2919 {
2920 unsigned long num;
2921 int ret;
2922
2923 if (!val)
2924 return -EINVAL;
2925 ret = kstrtoul(val, 0, &num);
2926 if (ret || num > NFS_CALLBACK_MAXPORTNR)
2927 return -EINVAL;
2928 *((unsigned int *)kp->arg) = num;
2929 return 0;
2930 }
2931 static const struct kernel_param_ops param_ops_portnr = {
2932 .set = param_set_portnr,
2933 .get = param_get_uint,
2934 };
2935 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2936
2937 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2938 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
2939 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
2940 "assigned to the NFSv4 callback channels.");
2941 module_param(nfs_idmap_cache_timeout, int, 0644);
2942 module_param(nfs4_disable_idmapping, bool, 0644);
2943 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2944 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2945 MODULE_PARM_DESC(nfs4_disable_idmapping,
2946 "Turn off NFSv4 idmapping when using 'sec=sys'");
2947 module_param(max_session_slots, ushort, 0644);
2948 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2949 "requests the client will negotiate");
2950 module_param(max_session_cb_slots, ushort, 0644);
2951 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
2952 "callbacks the client will process for a given server");
2953 module_param(send_implementation_id, ushort, 0644);
2954 MODULE_PARM_DESC(send_implementation_id,
2955 "Send implementation ID with NFSv4.1 exchange_id");
2956 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2957
2958 module_param(recover_lost_locks, bool, 0644);
2959 MODULE_PARM_DESC(recover_lost_locks,
2960 "If the server reports that a lock might be lost, "
2961 "try to recover it risking data corruption.");
2962
2963
2964 #endif /* CONFIG_NFS_V4 */
Linux with added FPC-III support