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