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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Syscall interface to knfsd.
4 *
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
6 */
7
8#include <linux/slab.h>
9#include <linux/namei.h>
10#include <linux/ctype.h>
11#include <linux/fs_context.h>
12
13#include <linux/sunrpc/svcsock.h>
14#include <linux/lockd/lockd.h>
15#include <linux/sunrpc/addr.h>
16#include <linux/sunrpc/gss_api.h>
17#include <linux/sunrpc/gss_krb5_enctypes.h>
18#include <linux/sunrpc/rpc_pipe_fs.h>
19#include <linux/module.h>
20#include <linux/fsnotify.h>
21
22#include "idmap.h"
23#include "nfsd.h"
24#include "cache.h"
25#include "state.h"
26#include "netns.h"
27#include "pnfs.h"
28#include "filecache.h"
29
30/*
31 * We have a single directory with several nodes in it.
32 */
33enum {
34 NFSD_Root = 1,
35 NFSD_List,
36 NFSD_Export_Stats,
37 NFSD_Export_features,
38 NFSD_Fh,
39 NFSD_FO_UnlockIP,
40 NFSD_FO_UnlockFS,
41 NFSD_Threads,
42 NFSD_Pool_Threads,
43 NFSD_Pool_Stats,
44 NFSD_Reply_Cache_Stats,
45 NFSD_Versions,
46 NFSD_Ports,
47 NFSD_MaxBlkSize,
48 NFSD_MaxConnections,
49 NFSD_Filecache,
50 NFSD_SupportedEnctypes,
51 /*
52 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
53 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
54 */
55#ifdef CONFIG_NFSD_V4
56 NFSD_Leasetime,
57 NFSD_Gracetime,
58 NFSD_RecoveryDir,
59 NFSD_V4EndGrace,
60#endif
61 NFSD_MaxReserved
62};
63
64/*
65 * write() for these nodes.
66 */
67static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
68static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
69static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
70static ssize_t write_threads(struct file *file, char *buf, size_t size);
71static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
72static ssize_t write_versions(struct file *file, char *buf, size_t size);
73static ssize_t write_ports(struct file *file, char *buf, size_t size);
74static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
75static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
76#ifdef CONFIG_NFSD_V4
77static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
78static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
79static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
80static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
81#endif
82
83static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
84 [NFSD_Fh] = write_filehandle,
85 [NFSD_FO_UnlockIP] = write_unlock_ip,
86 [NFSD_FO_UnlockFS] = write_unlock_fs,
87 [NFSD_Threads] = write_threads,
88 [NFSD_Pool_Threads] = write_pool_threads,
89 [NFSD_Versions] = write_versions,
90 [NFSD_Ports] = write_ports,
91 [NFSD_MaxBlkSize] = write_maxblksize,
92 [NFSD_MaxConnections] = write_maxconn,
93#ifdef CONFIG_NFSD_V4
94 [NFSD_Leasetime] = write_leasetime,
95 [NFSD_Gracetime] = write_gracetime,
96 [NFSD_RecoveryDir] = write_recoverydir,
97 [NFSD_V4EndGrace] = write_v4_end_grace,
98#endif
99};
100
101static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
102{
103 ino_t ino = file_inode(file)->i_ino;
104 char *data;
105 ssize_t rv;
106
107 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
108 return -EINVAL;
109
110 data = simple_transaction_get(file, buf, size);
111 if (IS_ERR(data))
112 return PTR_ERR(data);
113
114 rv = write_op[ino](file, data, size);
115 if (rv >= 0) {
116 simple_transaction_set(file, rv);
117 rv = size;
118 }
119 return rv;
120}
121
122static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
123{
124 if (! file->private_data) {
125 /* An attempt to read a transaction file without writing
126 * causes a 0-byte write so that the file can return
127 * state information
128 */
129 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
130 if (rv < 0)
131 return rv;
132 }
133 return simple_transaction_read(file, buf, size, pos);
134}
135
136static const struct file_operations transaction_ops = {
137 .write = nfsctl_transaction_write,
138 .read = nfsctl_transaction_read,
139 .release = simple_transaction_release,
140 .llseek = default_llseek,
141};
142
143static int exports_net_open(struct net *net, struct file *file)
144{
145 int err;
146 struct seq_file *seq;
147 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
148
149 err = seq_open(file, &nfs_exports_op);
150 if (err)
151 return err;
152
153 seq = file->private_data;
154 seq->private = nn->svc_export_cache;
155 return 0;
156}
157
158static int exports_proc_open(struct inode *inode, struct file *file)
159{
160 return exports_net_open(current->nsproxy->net_ns, file);
161}
162
163static const struct proc_ops exports_proc_ops = {
164 .proc_open = exports_proc_open,
165 .proc_read = seq_read,
166 .proc_lseek = seq_lseek,
167 .proc_release = seq_release,
168};
169
170static int exports_nfsd_open(struct inode *inode, struct file *file)
171{
172 return exports_net_open(inode->i_sb->s_fs_info, file);
173}
174
175static const struct file_operations exports_nfsd_operations = {
176 .open = exports_nfsd_open,
177 .read = seq_read,
178 .llseek = seq_lseek,
179 .release = seq_release,
180};
181
182static int export_features_show(struct seq_file *m, void *v)
183{
184 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
185 return 0;
186}
187
188DEFINE_SHOW_ATTRIBUTE(export_features);
189
190#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
191static int supported_enctypes_show(struct seq_file *m, void *v)
192{
193 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
194 return 0;
195}
196
197DEFINE_SHOW_ATTRIBUTE(supported_enctypes);
198#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
199
200static const struct file_operations pool_stats_operations = {
201 .open = nfsd_pool_stats_open,
202 .read = seq_read,
203 .llseek = seq_lseek,
204 .release = nfsd_pool_stats_release,
205};
206
207DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
208
209DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
210
211/*----------------------------------------------------------------------------*/
212/*
213 * payload - write methods
214 */
215
216static inline struct net *netns(struct file *file)
217{
218 return file_inode(file)->i_sb->s_fs_info;
219}
220
221/*
222 * write_unlock_ip - Release all locks used by a client
223 *
224 * Experimental.
225 *
226 * Input:
227 * buf: '\n'-terminated C string containing a
228 * presentation format IP address
229 * size: length of C string in @buf
230 * Output:
231 * On success: returns zero if all specified locks were released;
232 * returns one if one or more locks were not released
233 * On error: return code is negative errno value
234 */
235static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
236{
237 struct sockaddr_storage address;
238 struct sockaddr *sap = (struct sockaddr *)&address;
239 size_t salen = sizeof(address);
240 char *fo_path;
241 struct net *net = netns(file);
242
243 /* sanity check */
244 if (size == 0)
245 return -EINVAL;
246
247 if (buf[size-1] != '\n')
248 return -EINVAL;
249
250 fo_path = buf;
251 if (qword_get(&buf, fo_path, size) < 0)
252 return -EINVAL;
253
254 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
255 return -EINVAL;
256
257 return nlmsvc_unlock_all_by_ip(sap);
258}
259
260/*
261 * write_unlock_fs - Release all locks on a local file system
262 *
263 * Experimental.
264 *
265 * Input:
266 * buf: '\n'-terminated C string containing the
267 * absolute pathname of a local file system
268 * size: length of C string in @buf
269 * Output:
270 * On success: returns zero if all specified locks were released;
271 * returns one if one or more locks were not released
272 * On error: return code is negative errno value
273 */
274static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
275{
276 struct path path;
277 char *fo_path;
278 int error;
279
280 /* sanity check */
281 if (size == 0)
282 return -EINVAL;
283
284 if (buf[size-1] != '\n')
285 return -EINVAL;
286
287 fo_path = buf;
288 if (qword_get(&buf, fo_path, size) < 0)
289 return -EINVAL;
290
291 error = kern_path(fo_path, 0, &path);
292 if (error)
293 return error;
294
295 /*
296 * XXX: Needs better sanity checking. Otherwise we could end up
297 * releasing locks on the wrong file system.
298 *
299 * For example:
300 * 1. Does the path refer to a directory?
301 * 2. Is that directory a mount point, or
302 * 3. Is that directory the root of an exported file system?
303 */
304 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
305
306 path_put(&path);
307 return error;
308}
309
310/*
311 * write_filehandle - Get a variable-length NFS file handle by path
312 *
313 * On input, the buffer contains a '\n'-terminated C string comprised of
314 * three alphanumeric words separated by whitespace. The string may
315 * contain escape sequences.
316 *
317 * Input:
318 * buf:
319 * domain: client domain name
320 * path: export pathname
321 * maxsize: numeric maximum size of
322 * @buf
323 * size: length of C string in @buf
324 * Output:
325 * On success: passed-in buffer filled with '\n'-terminated C
326 * string containing a ASCII hex text version
327 * of the NFS file handle;
328 * return code is the size in bytes of the string
329 * On error: return code is negative errno value
330 */
331static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
332{
333 char *dname, *path;
334 int maxsize;
335 char *mesg = buf;
336 int len;
337 struct auth_domain *dom;
338 struct knfsd_fh fh;
339
340 if (size == 0)
341 return -EINVAL;
342
343 if (buf[size-1] != '\n')
344 return -EINVAL;
345 buf[size-1] = 0;
346
347 dname = mesg;
348 len = qword_get(&mesg, dname, size);
349 if (len <= 0)
350 return -EINVAL;
351
352 path = dname+len+1;
353 len = qword_get(&mesg, path, size);
354 if (len <= 0)
355 return -EINVAL;
356
357 len = get_int(&mesg, &maxsize);
358 if (len)
359 return len;
360
361 if (maxsize < NFS_FHSIZE)
362 return -EINVAL;
363 maxsize = min(maxsize, NFS3_FHSIZE);
364
365 if (qword_get(&mesg, mesg, size)>0)
366 return -EINVAL;
367
368 /* we have all the words, they are in buf.. */
369 dom = unix_domain_find(dname);
370 if (!dom)
371 return -ENOMEM;
372
373 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
374 auth_domain_put(dom);
375 if (len)
376 return len;
377
378 mesg = buf;
379 len = SIMPLE_TRANSACTION_LIMIT;
380 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
381 mesg[-1] = '\n';
382 return mesg - buf;
383}
384
385/*
386 * write_threads - Start NFSD, or report the current number of running threads
387 *
388 * Input:
389 * buf: ignored
390 * size: zero
391 * Output:
392 * On success: passed-in buffer filled with '\n'-terminated C
393 * string numeric value representing the number of
394 * running NFSD threads;
395 * return code is the size in bytes of the string
396 * On error: return code is zero
397 *
398 * OR
399 *
400 * Input:
401 * buf: C string containing an unsigned
402 * integer value representing the
403 * number of NFSD threads to start
404 * size: non-zero length of C string in @buf
405 * Output:
406 * On success: NFS service is started;
407 * passed-in buffer filled with '\n'-terminated C
408 * string numeric value representing the number of
409 * running NFSD threads;
410 * return code is the size in bytes of the string
411 * On error: return code is zero or a negative errno value
412 */
413static ssize_t write_threads(struct file *file, char *buf, size_t size)
414{
415 char *mesg = buf;
416 int rv;
417 struct net *net = netns(file);
418
419 if (size > 0) {
420 int newthreads;
421 rv = get_int(&mesg, &newthreads);
422 if (rv)
423 return rv;
424 if (newthreads < 0)
425 return -EINVAL;
426 rv = nfsd_svc(newthreads, net, file->f_cred);
427 if (rv < 0)
428 return rv;
429 } else
430 rv = nfsd_nrthreads(net);
431
432 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
433}
434
435/*
436 * write_pool_threads - Set or report the current number of threads per pool
437 *
438 * Input:
439 * buf: ignored
440 * size: zero
441 *
442 * OR
443 *
444 * Input:
445 * buf: C string containing whitespace-
446 * separated unsigned integer values
447 * representing the number of NFSD
448 * threads to start in each pool
449 * size: non-zero length of C string in @buf
450 * Output:
451 * On success: passed-in buffer filled with '\n'-terminated C
452 * string containing integer values representing the
453 * number of NFSD threads in each pool;
454 * return code is the size in bytes of the string
455 * On error: return code is zero or a negative errno value
456 */
457static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
458{
459 /* if size > 0, look for an array of number of threads per node
460 * and apply them then write out number of threads per node as reply
461 */
462 char *mesg = buf;
463 int i;
464 int rv;
465 int len;
466 int npools;
467 int *nthreads;
468 struct net *net = netns(file);
469
470 mutex_lock(&nfsd_mutex);
471 npools = nfsd_nrpools(net);
472 if (npools == 0) {
473 /*
474 * NFS is shut down. The admin can start it by
475 * writing to the threads file but NOT the pool_threads
476 * file, sorry. Report zero threads.
477 */
478 mutex_unlock(&nfsd_mutex);
479 strcpy(buf, "0\n");
480 return strlen(buf);
481 }
482
483 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
484 rv = -ENOMEM;
485 if (nthreads == NULL)
486 goto out_free;
487
488 if (size > 0) {
489 for (i = 0; i < npools; i++) {
490 rv = get_int(&mesg, &nthreads[i]);
491 if (rv == -ENOENT)
492 break; /* fewer numbers than pools */
493 if (rv)
494 goto out_free; /* syntax error */
495 rv = -EINVAL;
496 if (nthreads[i] < 0)
497 goto out_free;
498 }
499 rv = nfsd_set_nrthreads(i, nthreads, net);
500 if (rv)
501 goto out_free;
502 }
503
504 rv = nfsd_get_nrthreads(npools, nthreads, net);
505 if (rv)
506 goto out_free;
507
508 mesg = buf;
509 size = SIMPLE_TRANSACTION_LIMIT;
510 for (i = 0; i < npools && size > 0; i++) {
511 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
512 len = strlen(mesg);
513 size -= len;
514 mesg += len;
515 }
516 rv = mesg - buf;
517out_free:
518 kfree(nthreads);
519 mutex_unlock(&nfsd_mutex);
520 return rv;
521}
522
523static ssize_t
524nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
525 const char *sep, unsigned vers, int minor)
526{
527 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
528 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
529
530 if (vers == 4 && minor >= 0 &&
531 !nfsd_minorversion(nn, minor, NFSD_TEST))
532 supported = false;
533 if (minor == 0 && supported)
534 /*
535 * special case for backward compatability.
536 * +4.0 is never reported, it is implied by
537 * +4, unless -4.0 is present.
538 */
539 return 0;
540 return snprintf(buf, remaining, format, sep,
541 supported ? '+' : '-', vers, minor);
542}
543
544static ssize_t __write_versions(struct file *file, char *buf, size_t size)
545{
546 char *mesg = buf;
547 char *vers, *minorp, sign;
548 int len, num, remaining;
549 ssize_t tlen = 0;
550 char *sep;
551 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
552
553 if (size>0) {
554 if (nn->nfsd_serv)
555 /* Cannot change versions without updating
556 * nn->nfsd_serv->sv_xdrsize, and reallocing
557 * rq_argp and rq_resp
558 */
559 return -EBUSY;
560 if (buf[size-1] != '\n')
561 return -EINVAL;
562 buf[size-1] = 0;
563
564 vers = mesg;
565 len = qword_get(&mesg, vers, size);
566 if (len <= 0) return -EINVAL;
567 do {
568 enum vers_op cmd;
569 unsigned minor;
570 sign = *vers;
571 if (sign == '+' || sign == '-')
572 num = simple_strtol((vers+1), &minorp, 0);
573 else
574 num = simple_strtol(vers, &minorp, 0);
575 if (*minorp == '.') {
576 if (num != 4)
577 return -EINVAL;
578 if (kstrtouint(minorp+1, 0, &minor) < 0)
579 return -EINVAL;
580 }
581
582 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
583 switch(num) {
584#ifdef CONFIG_NFSD_V2
585 case 2:
586#endif
587 case 3:
588 nfsd_vers(nn, num, cmd);
589 break;
590 case 4:
591 if (*minorp == '.') {
592 if (nfsd_minorversion(nn, minor, cmd) < 0)
593 return -EINVAL;
594 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
595 /*
596 * Either we have +4 and no minors are enabled,
597 * or we have -4 and at least one minor is enabled.
598 * In either case, propagate 'cmd' to all minors.
599 */
600 minor = 0;
601 while (nfsd_minorversion(nn, minor, cmd) >= 0)
602 minor++;
603 }
604 break;
605 default:
606 /* Ignore requests to disable non-existent versions */
607 if (cmd == NFSD_SET)
608 return -EINVAL;
609 }
610 vers += len + 1;
611 } while ((len = qword_get(&mesg, vers, size)) > 0);
612 /* If all get turned off, turn them back on, as
613 * having no versions is BAD
614 */
615 nfsd_reset_versions(nn);
616 }
617
618 /* Now write current state into reply buffer */
619 sep = "";
620 remaining = SIMPLE_TRANSACTION_LIMIT;
621 for (num=2 ; num <= 4 ; num++) {
622 int minor;
623 if (!nfsd_vers(nn, num, NFSD_AVAIL))
624 continue;
625
626 minor = -1;
627 do {
628 len = nfsd_print_version_support(nn, buf, remaining,
629 sep, num, minor);
630 if (len >= remaining)
631 goto out;
632 remaining -= len;
633 buf += len;
634 tlen += len;
635 minor++;
636 if (len)
637 sep = " ";
638 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
639 }
640out:
641 len = snprintf(buf, remaining, "\n");
642 if (len >= remaining)
643 return -EINVAL;
644 return tlen + len;
645}
646
647/*
648 * write_versions - Set or report the available NFS protocol versions
649 *
650 * Input:
651 * buf: ignored
652 * size: zero
653 * Output:
654 * On success: passed-in buffer filled with '\n'-terminated C
655 * string containing positive or negative integer
656 * values representing the current status of each
657 * protocol version;
658 * return code is the size in bytes of the string
659 * On error: return code is zero or a negative errno value
660 *
661 * OR
662 *
663 * Input:
664 * buf: C string containing whitespace-
665 * separated positive or negative
666 * integer values representing NFS
667 * protocol versions to enable ("+n")
668 * or disable ("-n")
669 * size: non-zero length of C string in @buf
670 * Output:
671 * On success: status of zero or more protocol versions has
672 * been updated; passed-in buffer filled with
673 * '\n'-terminated C string containing positive
674 * or negative integer values representing the
675 * current status of each protocol version;
676 * return code is the size in bytes of the string
677 * On error: return code is zero or a negative errno value
678 */
679static ssize_t write_versions(struct file *file, char *buf, size_t size)
680{
681 ssize_t rv;
682
683 mutex_lock(&nfsd_mutex);
684 rv = __write_versions(file, buf, size);
685 mutex_unlock(&nfsd_mutex);
686 return rv;
687}
688
689/*
690 * Zero-length write. Return a list of NFSD's current listener
691 * transports.
692 */
693static ssize_t __write_ports_names(char *buf, struct net *net)
694{
695 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
696
697 if (nn->nfsd_serv == NULL)
698 return 0;
699 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
700}
701
702/*
703 * A single 'fd' number was written, in which case it must be for
704 * a socket of a supported family/protocol, and we use it as an
705 * nfsd listener.
706 */
707static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
708{
709 char *mesg = buf;
710 int fd, err;
711 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
712
713 err = get_int(&mesg, &fd);
714 if (err != 0 || fd < 0)
715 return -EINVAL;
716
717 if (svc_alien_sock(net, fd)) {
718 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
719 return -EINVAL;
720 }
721
722 err = nfsd_create_serv(net);
723 if (err != 0)
724 return err;
725
726 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
727
728 if (err >= 0 &&
729 !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
730 svc_get(nn->nfsd_serv);
731
732 nfsd_put(net);
733 return err;
734}
735
736/*
737 * A transport listener is added by writing it's transport name and
738 * a port number.
739 */
740static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
741{
742 char transport[16];
743 struct svc_xprt *xprt;
744 int port, err;
745 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
746
747 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
748 return -EINVAL;
749
750 if (port < 1 || port > USHRT_MAX)
751 return -EINVAL;
752
753 err = nfsd_create_serv(net);
754 if (err != 0)
755 return err;
756
757 err = svc_xprt_create(nn->nfsd_serv, transport, net,
758 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
759 if (err < 0)
760 goto out_err;
761
762 err = svc_xprt_create(nn->nfsd_serv, transport, net,
763 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
764 if (err < 0 && err != -EAFNOSUPPORT)
765 goto out_close;
766
767 if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
768 svc_get(nn->nfsd_serv);
769
770 nfsd_put(net);
771 return 0;
772out_close:
773 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
774 if (xprt != NULL) {
775 svc_xprt_close(xprt);
776 svc_xprt_put(xprt);
777 }
778out_err:
779 nfsd_put(net);
780 return err;
781}
782
783static ssize_t __write_ports(struct file *file, char *buf, size_t size,
784 struct net *net)
785{
786 if (size == 0)
787 return __write_ports_names(buf, net);
788
789 if (isdigit(buf[0]))
790 return __write_ports_addfd(buf, net, file->f_cred);
791
792 if (isalpha(buf[0]))
793 return __write_ports_addxprt(buf, net, file->f_cred);
794
795 return -EINVAL;
796}
797
798/*
799 * write_ports - Pass a socket file descriptor or transport name to listen on
800 *
801 * Input:
802 * buf: ignored
803 * size: zero
804 * Output:
805 * On success: passed-in buffer filled with a '\n'-terminated C
806 * string containing a whitespace-separated list of
807 * named NFSD listeners;
808 * return code is the size in bytes of the string
809 * On error: return code is zero or a negative errno value
810 *
811 * OR
812 *
813 * Input:
814 * buf: C string containing an unsigned
815 * integer value representing a bound
816 * but unconnected socket that is to be
817 * used as an NFSD listener; listen(3)
818 * must be called for a SOCK_STREAM
819 * socket, otherwise it is ignored
820 * size: non-zero length of C string in @buf
821 * Output:
822 * On success: NFS service is started;
823 * passed-in buffer filled with a '\n'-terminated C
824 * string containing a unique alphanumeric name of
825 * the listener;
826 * return code is the size in bytes of the string
827 * On error: return code is a negative errno value
828 *
829 * OR
830 *
831 * Input:
832 * buf: C string containing a transport
833 * name and an unsigned integer value
834 * representing the port to listen on,
835 * separated by whitespace
836 * size: non-zero length of C string in @buf
837 * Output:
838 * On success: returns zero; NFS service is started
839 * On error: return code is a negative errno value
840 */
841static ssize_t write_ports(struct file *file, char *buf, size_t size)
842{
843 ssize_t rv;
844
845 mutex_lock(&nfsd_mutex);
846 rv = __write_ports(file, buf, size, netns(file));
847 mutex_unlock(&nfsd_mutex);
848 return rv;
849}
850
851
852int nfsd_max_blksize;
853
854/*
855 * write_maxblksize - Set or report the current NFS blksize
856 *
857 * Input:
858 * buf: ignored
859 * size: zero
860 *
861 * OR
862 *
863 * Input:
864 * buf: C string containing an unsigned
865 * integer value representing the new
866 * NFS blksize
867 * size: non-zero length of C string in @buf
868 * Output:
869 * On success: passed-in buffer filled with '\n'-terminated C string
870 * containing numeric value of the current NFS blksize
871 * setting;
872 * return code is the size in bytes of the string
873 * On error: return code is zero or a negative errno value
874 */
875static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
876{
877 char *mesg = buf;
878 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
879
880 if (size > 0) {
881 int bsize;
882 int rv = get_int(&mesg, &bsize);
883 if (rv)
884 return rv;
885 /* force bsize into allowed range and
886 * required alignment.
887 */
888 bsize = max_t(int, bsize, 1024);
889 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
890 bsize &= ~(1024-1);
891 mutex_lock(&nfsd_mutex);
892 if (nn->nfsd_serv) {
893 mutex_unlock(&nfsd_mutex);
894 return -EBUSY;
895 }
896 nfsd_max_blksize = bsize;
897 mutex_unlock(&nfsd_mutex);
898 }
899
900 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
901 nfsd_max_blksize);
902}
903
904/*
905 * write_maxconn - Set or report the current max number of connections
906 *
907 * Input:
908 * buf: ignored
909 * size: zero
910 * OR
911 *
912 * Input:
913 * buf: C string containing an unsigned
914 * integer value representing the new
915 * number of max connections
916 * size: non-zero length of C string in @buf
917 * Output:
918 * On success: passed-in buffer filled with '\n'-terminated C string
919 * containing numeric value of max_connections setting
920 * for this net namespace;
921 * return code is the size in bytes of the string
922 * On error: return code is zero or a negative errno value
923 */
924static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
925{
926 char *mesg = buf;
927 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
928 unsigned int maxconn = nn->max_connections;
929
930 if (size > 0) {
931 int rv = get_uint(&mesg, &maxconn);
932
933 if (rv)
934 return rv;
935 nn->max_connections = maxconn;
936 }
937
938 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
939}
940
941#ifdef CONFIG_NFSD_V4
942static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
943 time64_t *time, struct nfsd_net *nn)
944{
945 char *mesg = buf;
946 int rv, i;
947
948 if (size > 0) {
949 if (nn->nfsd_serv)
950 return -EBUSY;
951 rv = get_int(&mesg, &i);
952 if (rv)
953 return rv;
954 /*
955 * Some sanity checking. We don't have a reason for
956 * these particular numbers, but problems with the
957 * extremes are:
958 * - Too short: the briefest network outage may
959 * cause clients to lose all their locks. Also,
960 * the frequent polling may be wasteful.
961 * - Too long: do you really want reboot recovery
962 * to take more than an hour? Or to make other
963 * clients wait an hour before being able to
964 * revoke a dead client's locks?
965 */
966 if (i < 10 || i > 3600)
967 return -EINVAL;
968 *time = i;
969 }
970
971 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
972}
973
974static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
975 time64_t *time, struct nfsd_net *nn)
976{
977 ssize_t rv;
978
979 mutex_lock(&nfsd_mutex);
980 rv = __nfsd4_write_time(file, buf, size, time, nn);
981 mutex_unlock(&nfsd_mutex);
982 return rv;
983}
984
985/*
986 * write_leasetime - Set or report the current NFSv4 lease time
987 *
988 * Input:
989 * buf: ignored
990 * size: zero
991 *
992 * OR
993 *
994 * Input:
995 * buf: C string containing an unsigned
996 * integer value representing the new
997 * NFSv4 lease expiry time
998 * size: non-zero length of C string in @buf
999 * Output:
1000 * On success: passed-in buffer filled with '\n'-terminated C
1001 * string containing unsigned integer value of the
1002 * current lease expiry time;
1003 * return code is the size in bytes of the string
1004 * On error: return code is zero or a negative errno value
1005 */
1006static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1007{
1008 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1009 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1010}
1011
1012/*
1013 * write_gracetime - Set or report current NFSv4 grace period time
1014 *
1015 * As above, but sets the time of the NFSv4 grace period.
1016 *
1017 * Note this should never be set to less than the *previous*
1018 * lease-period time, but we don't try to enforce this. (In the common
1019 * case (a new boot), we don't know what the previous lease time was
1020 * anyway.)
1021 */
1022static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1023{
1024 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1025 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1026}
1027
1028static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1029 struct nfsd_net *nn)
1030{
1031 char *mesg = buf;
1032 char *recdir;
1033 int len, status;
1034
1035 if (size > 0) {
1036 if (nn->nfsd_serv)
1037 return -EBUSY;
1038 if (size > PATH_MAX || buf[size-1] != '\n')
1039 return -EINVAL;
1040 buf[size-1] = 0;
1041
1042 recdir = mesg;
1043 len = qword_get(&mesg, recdir, size);
1044 if (len <= 0)
1045 return -EINVAL;
1046
1047 status = nfs4_reset_recoverydir(recdir);
1048 if (status)
1049 return status;
1050 }
1051
1052 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1053 nfs4_recoverydir());
1054}
1055
1056/*
1057 * write_recoverydir - Set or report the pathname of the recovery directory
1058 *
1059 * Input:
1060 * buf: ignored
1061 * size: zero
1062 *
1063 * OR
1064 *
1065 * Input:
1066 * buf: C string containing the pathname
1067 * of the directory on a local file
1068 * system containing permanent NFSv4
1069 * recovery data
1070 * size: non-zero length of C string in @buf
1071 * Output:
1072 * On success: passed-in buffer filled with '\n'-terminated C string
1073 * containing the current recovery pathname setting;
1074 * return code is the size in bytes of the string
1075 * On error: return code is zero or a negative errno value
1076 */
1077static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1078{
1079 ssize_t rv;
1080 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1081
1082 mutex_lock(&nfsd_mutex);
1083 rv = __write_recoverydir(file, buf, size, nn);
1084 mutex_unlock(&nfsd_mutex);
1085 return rv;
1086}
1087
1088/*
1089 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1090 *
1091 * Input:
1092 * buf: ignored
1093 * size: zero
1094 * OR
1095 *
1096 * Input:
1097 * buf: any value
1098 * size: non-zero length of C string in @buf
1099 * Output:
1100 * passed-in buffer filled with "Y" or "N" with a newline
1101 * and NULL-terminated C string. This indicates whether
1102 * the grace period has ended in the current net
1103 * namespace. Return code is the size in bytes of the
1104 * string. Writing a string that starts with 'Y', 'y', or
1105 * '1' to the file will end the grace period for nfsd's v4
1106 * lock manager.
1107 */
1108static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1109{
1110 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1111
1112 if (size > 0) {
1113 switch(buf[0]) {
1114 case 'Y':
1115 case 'y':
1116 case '1':
1117 if (!nn->nfsd_serv)
1118 return -EBUSY;
1119 nfsd4_end_grace(nn);
1120 break;
1121 default:
1122 return -EINVAL;
1123 }
1124 }
1125
1126 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1127 nn->grace_ended ? 'Y' : 'N');
1128}
1129
1130#endif
1131
1132/*----------------------------------------------------------------------------*/
1133/*
1134 * populating the filesystem.
1135 */
1136
1137/* Basically copying rpc_get_inode. */
1138static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1139{
1140 struct inode *inode = new_inode(sb);
1141 if (!inode)
1142 return NULL;
1143 /* Following advice from simple_fill_super documentation: */
1144 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1145 inode->i_mode = mode;
1146 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
1147 switch (mode & S_IFMT) {
1148 case S_IFDIR:
1149 inode->i_fop = &simple_dir_operations;
1150 inode->i_op = &simple_dir_inode_operations;
1151 inc_nlink(inode);
1152 break;
1153 default:
1154 break;
1155 }
1156 return inode;
1157}
1158
1159static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1160{
1161 struct inode *inode;
1162
1163 inode = nfsd_get_inode(dir->i_sb, mode);
1164 if (!inode)
1165 return -ENOMEM;
1166 if (ncl) {
1167 inode->i_private = ncl;
1168 kref_get(&ncl->cl_ref);
1169 }
1170 d_add(dentry, inode);
1171 inc_nlink(dir);
1172 fsnotify_mkdir(dir, dentry);
1173 return 0;
1174}
1175
1176static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1177{
1178 struct inode *dir = parent->d_inode;
1179 struct dentry *dentry;
1180 int ret = -ENOMEM;
1181
1182 inode_lock(dir);
1183 dentry = d_alloc_name(parent, name);
1184 if (!dentry)
1185 goto out_err;
1186 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1187 if (ret)
1188 goto out_err;
1189out:
1190 inode_unlock(dir);
1191 return dentry;
1192out_err:
1193 dput(dentry);
1194 dentry = ERR_PTR(ret);
1195 goto out;
1196}
1197
1198static void clear_ncl(struct inode *inode)
1199{
1200 struct nfsdfs_client *ncl = inode->i_private;
1201
1202 inode->i_private = NULL;
1203 kref_put(&ncl->cl_ref, ncl->cl_release);
1204}
1205
1206static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
1207{
1208 struct nfsdfs_client *nc = inode->i_private;
1209
1210 if (nc)
1211 kref_get(&nc->cl_ref);
1212 return nc;
1213}
1214
1215struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1216{
1217 struct nfsdfs_client *nc;
1218
1219 inode_lock_shared(inode);
1220 nc = __get_nfsdfs_client(inode);
1221 inode_unlock_shared(inode);
1222 return nc;
1223}
1224/* from __rpc_unlink */
1225static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
1226{
1227 int ret;
1228
1229 clear_ncl(d_inode(dentry));
1230 dget(dentry);
1231 ret = simple_unlink(dir, dentry);
1232 d_drop(dentry);
1233 fsnotify_unlink(dir, dentry);
1234 dput(dentry);
1235 WARN_ON_ONCE(ret);
1236}
1237
1238static void nfsdfs_remove_files(struct dentry *root)
1239{
1240 struct dentry *dentry, *tmp;
1241
1242 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
1243 if (!simple_positive(dentry)) {
1244 WARN_ON_ONCE(1); /* I think this can't happen? */
1245 continue;
1246 }
1247 nfsdfs_remove_file(d_inode(root), dentry);
1248 }
1249}
1250
1251/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1252 * code instead. */
1253static int nfsdfs_create_files(struct dentry *root,
1254 const struct tree_descr *files,
1255 struct dentry **fdentries)
1256{
1257 struct inode *dir = d_inode(root);
1258 struct inode *inode;
1259 struct dentry *dentry;
1260 int i;
1261
1262 inode_lock(dir);
1263 for (i = 0; files->name && files->name[0]; i++, files++) {
1264 dentry = d_alloc_name(root, files->name);
1265 if (!dentry)
1266 goto out;
1267 inode = nfsd_get_inode(d_inode(root)->i_sb,
1268 S_IFREG | files->mode);
1269 if (!inode) {
1270 dput(dentry);
1271 goto out;
1272 }
1273 inode->i_fop = files->ops;
1274 inode->i_private = __get_nfsdfs_client(dir);
1275 d_add(dentry, inode);
1276 fsnotify_create(dir, dentry);
1277 if (fdentries)
1278 fdentries[i] = dentry;
1279 }
1280 inode_unlock(dir);
1281 return 0;
1282out:
1283 nfsdfs_remove_files(root);
1284 inode_unlock(dir);
1285 return -ENOMEM;
1286}
1287
1288/* on success, returns positive number unique to that client. */
1289struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1290 struct nfsdfs_client *ncl, u32 id,
1291 const struct tree_descr *files,
1292 struct dentry **fdentries)
1293{
1294 struct dentry *dentry;
1295 char name[11];
1296 int ret;
1297
1298 sprintf(name, "%u", id);
1299
1300 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1301 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1302 return NULL;
1303 ret = nfsdfs_create_files(dentry, files, fdentries);
1304 if (ret) {
1305 nfsd_client_rmdir(dentry);
1306 return NULL;
1307 }
1308 return dentry;
1309}
1310
1311/* Taken from __rpc_rmdir: */
1312void nfsd_client_rmdir(struct dentry *dentry)
1313{
1314 struct inode *dir = d_inode(dentry->d_parent);
1315 struct inode *inode = d_inode(dentry);
1316 int ret;
1317
1318 inode_lock(dir);
1319 nfsdfs_remove_files(dentry);
1320 clear_ncl(inode);
1321 dget(dentry);
1322 ret = simple_rmdir(dir, dentry);
1323 WARN_ON_ONCE(ret);
1324 d_drop(dentry);
1325 fsnotify_rmdir(dir, dentry);
1326 dput(dentry);
1327 inode_unlock(dir);
1328}
1329
1330static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1331{
1332 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1333 nfsd_net_id);
1334 struct dentry *dentry;
1335 int ret;
1336
1337 static const struct tree_descr nfsd_files[] = {
1338 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1339 /* Per-export io stats use same ops as exports file */
1340 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1341 [NFSD_Export_features] = {"export_features",
1342 &export_features_fops, S_IRUGO},
1343 [NFSD_FO_UnlockIP] = {"unlock_ip",
1344 &transaction_ops, S_IWUSR|S_IRUSR},
1345 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1346 &transaction_ops, S_IWUSR|S_IRUSR},
1347 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1348 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1349 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1350 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1351 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1352 &nfsd_reply_cache_stats_fops, S_IRUGO},
1353 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1354 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1355 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1356 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1357 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1358#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1359 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes",
1360 &supported_enctypes_fops, S_IRUGO},
1361#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1362#ifdef CONFIG_NFSD_V4
1363 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1364 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1365 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1366 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1367#endif
1368 /* last one */ {""}
1369 };
1370
1371 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1372 if (ret)
1373 return ret;
1374 dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1375 if (IS_ERR(dentry))
1376 return PTR_ERR(dentry);
1377 nn->nfsd_client_dir = dentry;
1378 return 0;
1379}
1380
1381static int nfsd_fs_get_tree(struct fs_context *fc)
1382{
1383 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1384}
1385
1386static void nfsd_fs_free_fc(struct fs_context *fc)
1387{
1388 if (fc->s_fs_info)
1389 put_net(fc->s_fs_info);
1390}
1391
1392static const struct fs_context_operations nfsd_fs_context_ops = {
1393 .free = nfsd_fs_free_fc,
1394 .get_tree = nfsd_fs_get_tree,
1395};
1396
1397static int nfsd_init_fs_context(struct fs_context *fc)
1398{
1399 put_user_ns(fc->user_ns);
1400 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1401 fc->ops = &nfsd_fs_context_ops;
1402 return 0;
1403}
1404
1405static void nfsd_umount(struct super_block *sb)
1406{
1407 struct net *net = sb->s_fs_info;
1408
1409 nfsd_shutdown_threads(net);
1410
1411 kill_litter_super(sb);
1412 put_net(net);
1413}
1414
1415static struct file_system_type nfsd_fs_type = {
1416 .owner = THIS_MODULE,
1417 .name = "nfsd",
1418 .init_fs_context = nfsd_init_fs_context,
1419 .kill_sb = nfsd_umount,
1420};
1421MODULE_ALIAS_FS("nfsd");
1422
1423#ifdef CONFIG_PROC_FS
1424static int create_proc_exports_entry(void)
1425{
1426 struct proc_dir_entry *entry;
1427
1428 entry = proc_mkdir("fs/nfs", NULL);
1429 if (!entry)
1430 return -ENOMEM;
1431 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1432 if (!entry) {
1433 remove_proc_entry("fs/nfs", NULL);
1434 return -ENOMEM;
1435 }
1436 return 0;
1437}
1438#else /* CONFIG_PROC_FS */
1439static int create_proc_exports_entry(void)
1440{
1441 return 0;
1442}
1443#endif
1444
1445unsigned int nfsd_net_id;
1446
1447static __net_init int nfsd_init_net(struct net *net)
1448{
1449 int retval;
1450 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1451
1452 retval = nfsd_export_init(net);
1453 if (retval)
1454 goto out_export_error;
1455 retval = nfsd_idmap_init(net);
1456 if (retval)
1457 goto out_idmap_error;
1458 nn->nfsd_versions = NULL;
1459 nn->nfsd4_minorversions = NULL;
1460 nfsd4_init_leases_net(nn);
1461 retval = nfsd_reply_cache_init(nn);
1462 if (retval)
1463 goto out_cache_error;
1464 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
1465 seqlock_init(&nn->writeverf_lock);
1466
1467 return 0;
1468
1469out_cache_error:
1470 nfsd_idmap_shutdown(net);
1471out_idmap_error:
1472 nfsd_export_shutdown(net);
1473out_export_error:
1474 return retval;
1475}
1476
1477static __net_exit void nfsd_exit_net(struct net *net)
1478{
1479 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1480
1481 nfsd_reply_cache_shutdown(nn);
1482 nfsd_idmap_shutdown(net);
1483 nfsd_export_shutdown(net);
1484 nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
1485}
1486
1487static struct pernet_operations nfsd_net_ops = {
1488 .init = nfsd_init_net,
1489 .exit = nfsd_exit_net,
1490 .id = &nfsd_net_id,
1491 .size = sizeof(struct nfsd_net),
1492};
1493
1494static int __init init_nfsd(void)
1495{
1496 int retval;
1497
1498 retval = nfsd4_init_slabs();
1499 if (retval)
1500 return retval;
1501 retval = nfsd4_init_pnfs();
1502 if (retval)
1503 goto out_free_slabs;
1504 retval = nfsd_stat_init(); /* Statistics */
1505 if (retval)
1506 goto out_free_pnfs;
1507 retval = nfsd_drc_slab_create();
1508 if (retval)
1509 goto out_free_stat;
1510 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1511 retval = create_proc_exports_entry();
1512 if (retval)
1513 goto out_free_lockd;
1514 retval = register_pernet_subsys(&nfsd_net_ops);
1515 if (retval < 0)
1516 goto out_free_exports;
1517 retval = register_cld_notifier();
1518 if (retval)
1519 goto out_free_subsys;
1520 retval = nfsd4_create_laundry_wq();
1521 if (retval)
1522 goto out_free_cld;
1523 retval = register_filesystem(&nfsd_fs_type);
1524 if (retval)
1525 goto out_free_all;
1526 return 0;
1527out_free_all:
1528 nfsd4_destroy_laundry_wq();
1529out_free_cld:
1530 unregister_cld_notifier();
1531out_free_subsys:
1532 unregister_pernet_subsys(&nfsd_net_ops);
1533out_free_exports:
1534 remove_proc_entry("fs/nfs/exports", NULL);
1535 remove_proc_entry("fs/nfs", NULL);
1536out_free_lockd:
1537 nfsd_lockd_shutdown();
1538 nfsd_drc_slab_free();
1539out_free_stat:
1540 nfsd_stat_shutdown();
1541out_free_pnfs:
1542 nfsd4_exit_pnfs();
1543out_free_slabs:
1544 nfsd4_free_slabs();
1545 return retval;
1546}
1547
1548static void __exit exit_nfsd(void)
1549{
1550 unregister_filesystem(&nfsd_fs_type);
1551 nfsd4_destroy_laundry_wq();
1552 unregister_cld_notifier();
1553 unregister_pernet_subsys(&nfsd_net_ops);
1554 nfsd_drc_slab_free();
1555 remove_proc_entry("fs/nfs/exports", NULL);
1556 remove_proc_entry("fs/nfs", NULL);
1557 nfsd_stat_shutdown();
1558 nfsd_lockd_shutdown();
1559 nfsd4_free_slabs();
1560 nfsd4_exit_pnfs();
1561}
1562
1563MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1564MODULE_LICENSE("GPL");
1565module_init(init_nfsd)
1566module_exit(exit_nfsd)
1/*
2 * Syscall interface to knfsd.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include <linux/slab.h>
8#include <linux/namei.h>
9#include <linux/ctype.h>
10
11#include <linux/sunrpc/svcsock.h>
12#include <linux/lockd/lockd.h>
13#include <linux/sunrpc/addr.h>
14#include <linux/sunrpc/gss_api.h>
15#include <linux/sunrpc/gss_krb5_enctypes.h>
16#include <linux/sunrpc/rpc_pipe_fs.h>
17#include <linux/module.h>
18
19#include "idmap.h"
20#include "nfsd.h"
21#include "cache.h"
22#include "state.h"
23#include "netns.h"
24#include "pnfs.h"
25
26/*
27 * We have a single directory with several nodes in it.
28 */
29enum {
30 NFSD_Root = 1,
31 NFSD_List,
32 NFSD_Export_features,
33 NFSD_Fh,
34 NFSD_FO_UnlockIP,
35 NFSD_FO_UnlockFS,
36 NFSD_Threads,
37 NFSD_Pool_Threads,
38 NFSD_Pool_Stats,
39 NFSD_Reply_Cache_Stats,
40 NFSD_Versions,
41 NFSD_Ports,
42 NFSD_MaxBlkSize,
43 NFSD_MaxConnections,
44 NFSD_SupportedEnctypes,
45 /*
46 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
47 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
48 */
49#ifdef CONFIG_NFSD_V4
50 NFSD_Leasetime,
51 NFSD_Gracetime,
52 NFSD_RecoveryDir,
53 NFSD_V4EndGrace,
54#endif
55};
56
57/*
58 * write() for these nodes.
59 */
60static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
61static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
62static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
63static ssize_t write_threads(struct file *file, char *buf, size_t size);
64static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
65static ssize_t write_versions(struct file *file, char *buf, size_t size);
66static ssize_t write_ports(struct file *file, char *buf, size_t size);
67static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
68static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
69#ifdef CONFIG_NFSD_V4
70static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
71static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
72static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
73static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
74#endif
75
76static ssize_t (*write_op[])(struct file *, char *, size_t) = {
77 [NFSD_Fh] = write_filehandle,
78 [NFSD_FO_UnlockIP] = write_unlock_ip,
79 [NFSD_FO_UnlockFS] = write_unlock_fs,
80 [NFSD_Threads] = write_threads,
81 [NFSD_Pool_Threads] = write_pool_threads,
82 [NFSD_Versions] = write_versions,
83 [NFSD_Ports] = write_ports,
84 [NFSD_MaxBlkSize] = write_maxblksize,
85 [NFSD_MaxConnections] = write_maxconn,
86#ifdef CONFIG_NFSD_V4
87 [NFSD_Leasetime] = write_leasetime,
88 [NFSD_Gracetime] = write_gracetime,
89 [NFSD_RecoveryDir] = write_recoverydir,
90 [NFSD_V4EndGrace] = write_v4_end_grace,
91#endif
92};
93
94static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
95{
96 ino_t ino = file_inode(file)->i_ino;
97 char *data;
98 ssize_t rv;
99
100 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
101 return -EINVAL;
102
103 data = simple_transaction_get(file, buf, size);
104 if (IS_ERR(data))
105 return PTR_ERR(data);
106
107 rv = write_op[ino](file, data, size);
108 if (rv >= 0) {
109 simple_transaction_set(file, rv);
110 rv = size;
111 }
112 return rv;
113}
114
115static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
116{
117 if (! file->private_data) {
118 /* An attempt to read a transaction file without writing
119 * causes a 0-byte write so that the file can return
120 * state information
121 */
122 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
123 if (rv < 0)
124 return rv;
125 }
126 return simple_transaction_read(file, buf, size, pos);
127}
128
129static const struct file_operations transaction_ops = {
130 .write = nfsctl_transaction_write,
131 .read = nfsctl_transaction_read,
132 .release = simple_transaction_release,
133 .llseek = default_llseek,
134};
135
136static int exports_net_open(struct net *net, struct file *file)
137{
138 int err;
139 struct seq_file *seq;
140 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
141
142 err = seq_open(file, &nfs_exports_op);
143 if (err)
144 return err;
145
146 seq = file->private_data;
147 seq->private = nn->svc_export_cache;
148 return 0;
149}
150
151static int exports_proc_open(struct inode *inode, struct file *file)
152{
153 return exports_net_open(current->nsproxy->net_ns, file);
154}
155
156static const struct file_operations exports_proc_operations = {
157 .open = exports_proc_open,
158 .read = seq_read,
159 .llseek = seq_lseek,
160 .release = seq_release,
161};
162
163static int exports_nfsd_open(struct inode *inode, struct file *file)
164{
165 return exports_net_open(inode->i_sb->s_fs_info, file);
166}
167
168static const struct file_operations exports_nfsd_operations = {
169 .open = exports_nfsd_open,
170 .read = seq_read,
171 .llseek = seq_lseek,
172 .release = seq_release,
173};
174
175static int export_features_show(struct seq_file *m, void *v)
176{
177 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
178 return 0;
179}
180
181static int export_features_open(struct inode *inode, struct file *file)
182{
183 return single_open(file, export_features_show, NULL);
184}
185
186static const struct file_operations export_features_operations = {
187 .open = export_features_open,
188 .read = seq_read,
189 .llseek = seq_lseek,
190 .release = single_release,
191};
192
193#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
194static int supported_enctypes_show(struct seq_file *m, void *v)
195{
196 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
197 return 0;
198}
199
200static int supported_enctypes_open(struct inode *inode, struct file *file)
201{
202 return single_open(file, supported_enctypes_show, NULL);
203}
204
205static const struct file_operations supported_enctypes_ops = {
206 .open = supported_enctypes_open,
207 .read = seq_read,
208 .llseek = seq_lseek,
209 .release = single_release,
210};
211#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
212
213static const struct file_operations pool_stats_operations = {
214 .open = nfsd_pool_stats_open,
215 .read = seq_read,
216 .llseek = seq_lseek,
217 .release = nfsd_pool_stats_release,
218};
219
220static const struct file_operations reply_cache_stats_operations = {
221 .open = nfsd_reply_cache_stats_open,
222 .read = seq_read,
223 .llseek = seq_lseek,
224 .release = single_release,
225};
226
227/*----------------------------------------------------------------------------*/
228/*
229 * payload - write methods
230 */
231
232static inline struct net *netns(struct file *file)
233{
234 return file_inode(file)->i_sb->s_fs_info;
235}
236
237/**
238 * write_unlock_ip - Release all locks used by a client
239 *
240 * Experimental.
241 *
242 * Input:
243 * buf: '\n'-terminated C string containing a
244 * presentation format IP address
245 * size: length of C string in @buf
246 * Output:
247 * On success: returns zero if all specified locks were released;
248 * returns one if one or more locks were not released
249 * On error: return code is negative errno value
250 */
251static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
252{
253 struct sockaddr_storage address;
254 struct sockaddr *sap = (struct sockaddr *)&address;
255 size_t salen = sizeof(address);
256 char *fo_path;
257 struct net *net = netns(file);
258
259 /* sanity check */
260 if (size == 0)
261 return -EINVAL;
262
263 if (buf[size-1] != '\n')
264 return -EINVAL;
265
266 fo_path = buf;
267 if (qword_get(&buf, fo_path, size) < 0)
268 return -EINVAL;
269
270 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
271 return -EINVAL;
272
273 return nlmsvc_unlock_all_by_ip(sap);
274}
275
276/**
277 * write_unlock_fs - Release all locks on a local file system
278 *
279 * Experimental.
280 *
281 * Input:
282 * buf: '\n'-terminated C string containing the
283 * absolute pathname of a local file system
284 * size: length of C string in @buf
285 * Output:
286 * On success: returns zero if all specified locks were released;
287 * returns one if one or more locks were not released
288 * On error: return code is negative errno value
289 */
290static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
291{
292 struct path path;
293 char *fo_path;
294 int error;
295
296 /* sanity check */
297 if (size == 0)
298 return -EINVAL;
299
300 if (buf[size-1] != '\n')
301 return -EINVAL;
302
303 fo_path = buf;
304 if (qword_get(&buf, fo_path, size) < 0)
305 return -EINVAL;
306
307 error = kern_path(fo_path, 0, &path);
308 if (error)
309 return error;
310
311 /*
312 * XXX: Needs better sanity checking. Otherwise we could end up
313 * releasing locks on the wrong file system.
314 *
315 * For example:
316 * 1. Does the path refer to a directory?
317 * 2. Is that directory a mount point, or
318 * 3. Is that directory the root of an exported file system?
319 */
320 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
321
322 path_put(&path);
323 return error;
324}
325
326/**
327 * write_filehandle - Get a variable-length NFS file handle by path
328 *
329 * On input, the buffer contains a '\n'-terminated C string comprised of
330 * three alphanumeric words separated by whitespace. The string may
331 * contain escape sequences.
332 *
333 * Input:
334 * buf:
335 * domain: client domain name
336 * path: export pathname
337 * maxsize: numeric maximum size of
338 * @buf
339 * size: length of C string in @buf
340 * Output:
341 * On success: passed-in buffer filled with '\n'-terminated C
342 * string containing a ASCII hex text version
343 * of the NFS file handle;
344 * return code is the size in bytes of the string
345 * On error: return code is negative errno value
346 */
347static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
348{
349 char *dname, *path;
350 int uninitialized_var(maxsize);
351 char *mesg = buf;
352 int len;
353 struct auth_domain *dom;
354 struct knfsd_fh fh;
355
356 if (size == 0)
357 return -EINVAL;
358
359 if (buf[size-1] != '\n')
360 return -EINVAL;
361 buf[size-1] = 0;
362
363 dname = mesg;
364 len = qword_get(&mesg, dname, size);
365 if (len <= 0)
366 return -EINVAL;
367
368 path = dname+len+1;
369 len = qword_get(&mesg, path, size);
370 if (len <= 0)
371 return -EINVAL;
372
373 len = get_int(&mesg, &maxsize);
374 if (len)
375 return len;
376
377 if (maxsize < NFS_FHSIZE)
378 return -EINVAL;
379 maxsize = min(maxsize, NFS3_FHSIZE);
380
381 if (qword_get(&mesg, mesg, size)>0)
382 return -EINVAL;
383
384 /* we have all the words, they are in buf.. */
385 dom = unix_domain_find(dname);
386 if (!dom)
387 return -ENOMEM;
388
389 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
390 auth_domain_put(dom);
391 if (len)
392 return len;
393
394 mesg = buf;
395 len = SIMPLE_TRANSACTION_LIMIT;
396 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
397 mesg[-1] = '\n';
398 return mesg - buf;
399}
400
401/**
402 * write_threads - Start NFSD, or report the current number of running threads
403 *
404 * Input:
405 * buf: ignored
406 * size: zero
407 * Output:
408 * On success: passed-in buffer filled with '\n'-terminated C
409 * string numeric value representing the number of
410 * running NFSD threads;
411 * return code is the size in bytes of the string
412 * On error: return code is zero
413 *
414 * OR
415 *
416 * Input:
417 * buf: C string containing an unsigned
418 * integer value representing the
419 * number of NFSD threads to start
420 * size: non-zero length of C string in @buf
421 * Output:
422 * On success: NFS service is started;
423 * passed-in buffer filled with '\n'-terminated C
424 * string numeric value representing the number of
425 * running NFSD threads;
426 * return code is the size in bytes of the string
427 * On error: return code is zero or a negative errno value
428 */
429static ssize_t write_threads(struct file *file, char *buf, size_t size)
430{
431 char *mesg = buf;
432 int rv;
433 struct net *net = netns(file);
434
435 if (size > 0) {
436 int newthreads;
437 rv = get_int(&mesg, &newthreads);
438 if (rv)
439 return rv;
440 if (newthreads < 0)
441 return -EINVAL;
442 rv = nfsd_svc(newthreads, net);
443 if (rv < 0)
444 return rv;
445 } else
446 rv = nfsd_nrthreads(net);
447
448 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
449}
450
451/**
452 * write_pool_threads - Set or report the current number of threads per pool
453 *
454 * Input:
455 * buf: ignored
456 * size: zero
457 *
458 * OR
459 *
460 * Input:
461 * buf: C string containing whitespace-
462 * separated unsigned integer values
463 * representing the number of NFSD
464 * threads to start in each pool
465 * size: non-zero length of C string in @buf
466 * Output:
467 * On success: passed-in buffer filled with '\n'-terminated C
468 * string containing integer values representing the
469 * number of NFSD threads in each pool;
470 * return code is the size in bytes of the string
471 * On error: return code is zero or a negative errno value
472 */
473static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
474{
475 /* if size > 0, look for an array of number of threads per node
476 * and apply them then write out number of threads per node as reply
477 */
478 char *mesg = buf;
479 int i;
480 int rv;
481 int len;
482 int npools;
483 int *nthreads;
484 struct net *net = netns(file);
485
486 mutex_lock(&nfsd_mutex);
487 npools = nfsd_nrpools(net);
488 if (npools == 0) {
489 /*
490 * NFS is shut down. The admin can start it by
491 * writing to the threads file but NOT the pool_threads
492 * file, sorry. Report zero threads.
493 */
494 mutex_unlock(&nfsd_mutex);
495 strcpy(buf, "0\n");
496 return strlen(buf);
497 }
498
499 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
500 rv = -ENOMEM;
501 if (nthreads == NULL)
502 goto out_free;
503
504 if (size > 0) {
505 for (i = 0; i < npools; i++) {
506 rv = get_int(&mesg, &nthreads[i]);
507 if (rv == -ENOENT)
508 break; /* fewer numbers than pools */
509 if (rv)
510 goto out_free; /* syntax error */
511 rv = -EINVAL;
512 if (nthreads[i] < 0)
513 goto out_free;
514 }
515 rv = nfsd_set_nrthreads(i, nthreads, net);
516 if (rv)
517 goto out_free;
518 }
519
520 rv = nfsd_get_nrthreads(npools, nthreads, net);
521 if (rv)
522 goto out_free;
523
524 mesg = buf;
525 size = SIMPLE_TRANSACTION_LIMIT;
526 for (i = 0; i < npools && size > 0; i++) {
527 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
528 len = strlen(mesg);
529 size -= len;
530 mesg += len;
531 }
532 rv = mesg - buf;
533out_free:
534 kfree(nthreads);
535 mutex_unlock(&nfsd_mutex);
536 return rv;
537}
538
539static ssize_t
540nfsd_print_version_support(char *buf, int remaining, const char *sep,
541 unsigned vers, int minor)
542{
543 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
544 bool supported = !!nfsd_vers(vers, NFSD_TEST);
545
546 if (vers == 4 && minor >= 0 &&
547 !nfsd_minorversion(minor, NFSD_TEST))
548 supported = false;
549 if (minor == 0 && supported)
550 /*
551 * special case for backward compatability.
552 * +4.0 is never reported, it is implied by
553 * +4, unless -4.0 is present.
554 */
555 return 0;
556 return snprintf(buf, remaining, format, sep,
557 supported ? '+' : '-', vers, minor);
558}
559
560static ssize_t __write_versions(struct file *file, char *buf, size_t size)
561{
562 char *mesg = buf;
563 char *vers, *minorp, sign;
564 int len, num, remaining;
565 ssize_t tlen = 0;
566 char *sep;
567 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
568
569 if (size>0) {
570 if (nn->nfsd_serv)
571 /* Cannot change versions without updating
572 * nn->nfsd_serv->sv_xdrsize, and reallocing
573 * rq_argp and rq_resp
574 */
575 return -EBUSY;
576 if (buf[size-1] != '\n')
577 return -EINVAL;
578 buf[size-1] = 0;
579
580 vers = mesg;
581 len = qword_get(&mesg, vers, size);
582 if (len <= 0) return -EINVAL;
583 do {
584 enum vers_op cmd;
585 unsigned minor;
586 sign = *vers;
587 if (sign == '+' || sign == '-')
588 num = simple_strtol((vers+1), &minorp, 0);
589 else
590 num = simple_strtol(vers, &minorp, 0);
591 if (*minorp == '.') {
592 if (num != 4)
593 return -EINVAL;
594 if (kstrtouint(minorp+1, 0, &minor) < 0)
595 return -EINVAL;
596 }
597
598 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
599 switch(num) {
600 case 2:
601 case 3:
602 nfsd_vers(num, cmd);
603 break;
604 case 4:
605 if (*minorp == '.') {
606 if (nfsd_minorversion(minor, cmd) < 0)
607 return -EINVAL;
608 } else if ((cmd == NFSD_SET) != nfsd_vers(num, NFSD_TEST)) {
609 /*
610 * Either we have +4 and no minors are enabled,
611 * or we have -4 and at least one minor is enabled.
612 * In either case, propagate 'cmd' to all minors.
613 */
614 minor = 0;
615 while (nfsd_minorversion(minor, cmd) >= 0)
616 minor++;
617 }
618 break;
619 default:
620 return -EINVAL;
621 }
622 vers += len + 1;
623 } while ((len = qword_get(&mesg, vers, size)) > 0);
624 /* If all get turned off, turn them back on, as
625 * having no versions is BAD
626 */
627 nfsd_reset_versions();
628 }
629
630 /* Now write current state into reply buffer */
631 len = 0;
632 sep = "";
633 remaining = SIMPLE_TRANSACTION_LIMIT;
634 for (num=2 ; num <= 4 ; num++) {
635 int minor;
636 if (!nfsd_vers(num, NFSD_AVAIL))
637 continue;
638
639 minor = -1;
640 do {
641 len = nfsd_print_version_support(buf, remaining,
642 sep, num, minor);
643 if (len >= remaining)
644 goto out;
645 remaining -= len;
646 buf += len;
647 tlen += len;
648 minor++;
649 if (len)
650 sep = " ";
651 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
652 }
653out:
654 len = snprintf(buf, remaining, "\n");
655 if (len >= remaining)
656 return -EINVAL;
657 return tlen + len;
658}
659
660/**
661 * write_versions - Set or report the available NFS protocol versions
662 *
663 * Input:
664 * buf: ignored
665 * size: zero
666 * Output:
667 * On success: passed-in buffer filled with '\n'-terminated C
668 * string containing positive or negative integer
669 * values representing the current status of each
670 * protocol version;
671 * return code is the size in bytes of the string
672 * On error: return code is zero or a negative errno value
673 *
674 * OR
675 *
676 * Input:
677 * buf: C string containing whitespace-
678 * separated positive or negative
679 * integer values representing NFS
680 * protocol versions to enable ("+n")
681 * or disable ("-n")
682 * size: non-zero length of C string in @buf
683 * Output:
684 * On success: status of zero or more protocol versions has
685 * been updated; passed-in buffer filled with
686 * '\n'-terminated C string containing positive
687 * or negative integer values representing the
688 * current status of each protocol version;
689 * return code is the size in bytes of the string
690 * On error: return code is zero or a negative errno value
691 */
692static ssize_t write_versions(struct file *file, char *buf, size_t size)
693{
694 ssize_t rv;
695
696 mutex_lock(&nfsd_mutex);
697 rv = __write_versions(file, buf, size);
698 mutex_unlock(&nfsd_mutex);
699 return rv;
700}
701
702/*
703 * Zero-length write. Return a list of NFSD's current listener
704 * transports.
705 */
706static ssize_t __write_ports_names(char *buf, struct net *net)
707{
708 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
709
710 if (nn->nfsd_serv == NULL)
711 return 0;
712 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
713}
714
715/*
716 * A single 'fd' number was written, in which case it must be for
717 * a socket of a supported family/protocol, and we use it as an
718 * nfsd listener.
719 */
720static ssize_t __write_ports_addfd(char *buf, struct net *net)
721{
722 char *mesg = buf;
723 int fd, err;
724 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
725
726 err = get_int(&mesg, &fd);
727 if (err != 0 || fd < 0)
728 return -EINVAL;
729
730 if (svc_alien_sock(net, fd)) {
731 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
732 return -EINVAL;
733 }
734
735 err = nfsd_create_serv(net);
736 if (err != 0)
737 return err;
738
739 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
740 if (err < 0) {
741 nfsd_destroy(net);
742 return err;
743 }
744
745 /* Decrease the count, but don't shut down the service */
746 nn->nfsd_serv->sv_nrthreads--;
747 return err;
748}
749
750/*
751 * A transport listener is added by writing it's transport name and
752 * a port number.
753 */
754static ssize_t __write_ports_addxprt(char *buf, struct net *net)
755{
756 char transport[16];
757 struct svc_xprt *xprt;
758 int port, err;
759 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
760
761 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
762 return -EINVAL;
763
764 if (port < 1 || port > USHRT_MAX)
765 return -EINVAL;
766
767 err = nfsd_create_serv(net);
768 if (err != 0)
769 return err;
770
771 err = svc_create_xprt(nn->nfsd_serv, transport, net,
772 PF_INET, port, SVC_SOCK_ANONYMOUS);
773 if (err < 0)
774 goto out_err;
775
776 err = svc_create_xprt(nn->nfsd_serv, transport, net,
777 PF_INET6, port, SVC_SOCK_ANONYMOUS);
778 if (err < 0 && err != -EAFNOSUPPORT)
779 goto out_close;
780
781 /* Decrease the count, but don't shut down the service */
782 nn->nfsd_serv->sv_nrthreads--;
783 return 0;
784out_close:
785 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
786 if (xprt != NULL) {
787 svc_close_xprt(xprt);
788 svc_xprt_put(xprt);
789 }
790out_err:
791 nfsd_destroy(net);
792 return err;
793}
794
795static ssize_t __write_ports(struct file *file, char *buf, size_t size,
796 struct net *net)
797{
798 if (size == 0)
799 return __write_ports_names(buf, net);
800
801 if (isdigit(buf[0]))
802 return __write_ports_addfd(buf, net);
803
804 if (isalpha(buf[0]))
805 return __write_ports_addxprt(buf, net);
806
807 return -EINVAL;
808}
809
810/**
811 * write_ports - Pass a socket file descriptor or transport name to listen on
812 *
813 * Input:
814 * buf: ignored
815 * size: zero
816 * Output:
817 * On success: passed-in buffer filled with a '\n'-terminated C
818 * string containing a whitespace-separated list of
819 * named NFSD listeners;
820 * return code is the size in bytes of the string
821 * On error: return code is zero or a negative errno value
822 *
823 * OR
824 *
825 * Input:
826 * buf: C string containing an unsigned
827 * integer value representing a bound
828 * but unconnected socket that is to be
829 * used as an NFSD listener; listen(3)
830 * must be called for a SOCK_STREAM
831 * socket, otherwise it is ignored
832 * size: non-zero length of C string in @buf
833 * Output:
834 * On success: NFS service is started;
835 * passed-in buffer filled with a '\n'-terminated C
836 * string containing a unique alphanumeric name of
837 * the listener;
838 * return code is the size in bytes of the string
839 * On error: return code is a negative errno value
840 *
841 * OR
842 *
843 * Input:
844 * buf: C string containing a transport
845 * name and an unsigned integer value
846 * representing the port to listen on,
847 * separated by whitespace
848 * size: non-zero length of C string in @buf
849 * Output:
850 * On success: returns zero; NFS service is started
851 * On error: return code is a negative errno value
852 */
853static ssize_t write_ports(struct file *file, char *buf, size_t size)
854{
855 ssize_t rv;
856
857 mutex_lock(&nfsd_mutex);
858 rv = __write_ports(file, buf, size, netns(file));
859 mutex_unlock(&nfsd_mutex);
860 return rv;
861}
862
863
864int nfsd_max_blksize;
865
866/**
867 * write_maxblksize - Set or report the current NFS blksize
868 *
869 * Input:
870 * buf: ignored
871 * size: zero
872 *
873 * OR
874 *
875 * Input:
876 * buf: C string containing an unsigned
877 * integer value representing the new
878 * NFS blksize
879 * size: non-zero length of C string in @buf
880 * Output:
881 * On success: passed-in buffer filled with '\n'-terminated C string
882 * containing numeric value of the current NFS blksize
883 * setting;
884 * return code is the size in bytes of the string
885 * On error: return code is zero or a negative errno value
886 */
887static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
888{
889 char *mesg = buf;
890 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
891
892 if (size > 0) {
893 int bsize;
894 int rv = get_int(&mesg, &bsize);
895 if (rv)
896 return rv;
897 /* force bsize into allowed range and
898 * required alignment.
899 */
900 bsize = max_t(int, bsize, 1024);
901 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
902 bsize &= ~(1024-1);
903 mutex_lock(&nfsd_mutex);
904 if (nn->nfsd_serv) {
905 mutex_unlock(&nfsd_mutex);
906 return -EBUSY;
907 }
908 nfsd_max_blksize = bsize;
909 mutex_unlock(&nfsd_mutex);
910 }
911
912 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
913 nfsd_max_blksize);
914}
915
916/**
917 * write_maxconn - Set or report the current max number of connections
918 *
919 * Input:
920 * buf: ignored
921 * size: zero
922 * OR
923 *
924 * Input:
925 * buf: C string containing an unsigned
926 * integer value representing the new
927 * number of max connections
928 * size: non-zero length of C string in @buf
929 * Output:
930 * On success: passed-in buffer filled with '\n'-terminated C string
931 * containing numeric value of max_connections setting
932 * for this net namespace;
933 * return code is the size in bytes of the string
934 * On error: return code is zero or a negative errno value
935 */
936static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
937{
938 char *mesg = buf;
939 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
940 unsigned int maxconn = nn->max_connections;
941
942 if (size > 0) {
943 int rv = get_uint(&mesg, &maxconn);
944
945 if (rv)
946 return rv;
947 nn->max_connections = maxconn;
948 }
949
950 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
951}
952
953#ifdef CONFIG_NFSD_V4
954static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
955 time_t *time, struct nfsd_net *nn)
956{
957 char *mesg = buf;
958 int rv, i;
959
960 if (size > 0) {
961 if (nn->nfsd_serv)
962 return -EBUSY;
963 rv = get_int(&mesg, &i);
964 if (rv)
965 return rv;
966 /*
967 * Some sanity checking. We don't have a reason for
968 * these particular numbers, but problems with the
969 * extremes are:
970 * - Too short: the briefest network outage may
971 * cause clients to lose all their locks. Also,
972 * the frequent polling may be wasteful.
973 * - Too long: do you really want reboot recovery
974 * to take more than an hour? Or to make other
975 * clients wait an hour before being able to
976 * revoke a dead client's locks?
977 */
978 if (i < 10 || i > 3600)
979 return -EINVAL;
980 *time = i;
981 }
982
983 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
984}
985
986static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
987 time_t *time, struct nfsd_net *nn)
988{
989 ssize_t rv;
990
991 mutex_lock(&nfsd_mutex);
992 rv = __nfsd4_write_time(file, buf, size, time, nn);
993 mutex_unlock(&nfsd_mutex);
994 return rv;
995}
996
997/**
998 * write_leasetime - Set or report the current NFSv4 lease time
999 *
1000 * Input:
1001 * buf: ignored
1002 * size: zero
1003 *
1004 * OR
1005 *
1006 * Input:
1007 * buf: C string containing an unsigned
1008 * integer value representing the new
1009 * NFSv4 lease expiry time
1010 * size: non-zero length of C string in @buf
1011 * Output:
1012 * On success: passed-in buffer filled with '\n'-terminated C
1013 * string containing unsigned integer value of the
1014 * current lease expiry time;
1015 * return code is the size in bytes of the string
1016 * On error: return code is zero or a negative errno value
1017 */
1018static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1019{
1020 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1021 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1022}
1023
1024/**
1025 * write_gracetime - Set or report current NFSv4 grace period time
1026 *
1027 * As above, but sets the time of the NFSv4 grace period.
1028 *
1029 * Note this should never be set to less than the *previous*
1030 * lease-period time, but we don't try to enforce this. (In the common
1031 * case (a new boot), we don't know what the previous lease time was
1032 * anyway.)
1033 */
1034static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1035{
1036 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1037 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1038}
1039
1040static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1041 struct nfsd_net *nn)
1042{
1043 char *mesg = buf;
1044 char *recdir;
1045 int len, status;
1046
1047 if (size > 0) {
1048 if (nn->nfsd_serv)
1049 return -EBUSY;
1050 if (size > PATH_MAX || buf[size-1] != '\n')
1051 return -EINVAL;
1052 buf[size-1] = 0;
1053
1054 recdir = mesg;
1055 len = qword_get(&mesg, recdir, size);
1056 if (len <= 0)
1057 return -EINVAL;
1058
1059 status = nfs4_reset_recoverydir(recdir);
1060 if (status)
1061 return status;
1062 }
1063
1064 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1065 nfs4_recoverydir());
1066}
1067
1068/**
1069 * write_recoverydir - Set or report the pathname of the recovery directory
1070 *
1071 * Input:
1072 * buf: ignored
1073 * size: zero
1074 *
1075 * OR
1076 *
1077 * Input:
1078 * buf: C string containing the pathname
1079 * of the directory on a local file
1080 * system containing permanent NFSv4
1081 * recovery data
1082 * size: non-zero length of C string in @buf
1083 * Output:
1084 * On success: passed-in buffer filled with '\n'-terminated C string
1085 * containing the current recovery pathname setting;
1086 * return code is the size in bytes of the string
1087 * On error: return code is zero or a negative errno value
1088 */
1089static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1090{
1091 ssize_t rv;
1092 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1093
1094 mutex_lock(&nfsd_mutex);
1095 rv = __write_recoverydir(file, buf, size, nn);
1096 mutex_unlock(&nfsd_mutex);
1097 return rv;
1098}
1099
1100/**
1101 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1102 *
1103 * Input:
1104 * buf: ignored
1105 * size: zero
1106 * OR
1107 *
1108 * Input:
1109 * buf: any value
1110 * size: non-zero length of C string in @buf
1111 * Output:
1112 * passed-in buffer filled with "Y" or "N" with a newline
1113 * and NULL-terminated C string. This indicates whether
1114 * the grace period has ended in the current net
1115 * namespace. Return code is the size in bytes of the
1116 * string. Writing a string that starts with 'Y', 'y', or
1117 * '1' to the file will end the grace period for nfsd's v4
1118 * lock manager.
1119 */
1120static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1121{
1122 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1123
1124 if (size > 0) {
1125 switch(buf[0]) {
1126 case 'Y':
1127 case 'y':
1128 case '1':
1129 nfsd4_end_grace(nn);
1130 break;
1131 default:
1132 return -EINVAL;
1133 }
1134 }
1135
1136 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1137 nn->grace_ended ? 'Y' : 'N');
1138}
1139
1140#endif
1141
1142/*----------------------------------------------------------------------------*/
1143/*
1144 * populating the filesystem.
1145 */
1146
1147static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1148{
1149 static const struct tree_descr nfsd_files[] = {
1150 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1151 [NFSD_Export_features] = {"export_features",
1152 &export_features_operations, S_IRUGO},
1153 [NFSD_FO_UnlockIP] = {"unlock_ip",
1154 &transaction_ops, S_IWUSR|S_IRUSR},
1155 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1156 &transaction_ops, S_IWUSR|S_IRUSR},
1157 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1158 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1159 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1160 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1161 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1162 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1163 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1164 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1165 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1166#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1167 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1168#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1169#ifdef CONFIG_NFSD_V4
1170 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1171 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1172 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1173 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1174#endif
1175 /* last one */ {""}
1176 };
1177 get_net(sb->s_fs_info);
1178 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1179}
1180
1181static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1182 int flags, const char *dev_name, void *data)
1183{
1184 struct net *net = current->nsproxy->net_ns;
1185 return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1186}
1187
1188static void nfsd_umount(struct super_block *sb)
1189{
1190 struct net *net = sb->s_fs_info;
1191
1192 kill_litter_super(sb);
1193 put_net(net);
1194}
1195
1196static struct file_system_type nfsd_fs_type = {
1197 .owner = THIS_MODULE,
1198 .name = "nfsd",
1199 .mount = nfsd_mount,
1200 .kill_sb = nfsd_umount,
1201};
1202MODULE_ALIAS_FS("nfsd");
1203
1204#ifdef CONFIG_PROC_FS
1205static int create_proc_exports_entry(void)
1206{
1207 struct proc_dir_entry *entry;
1208
1209 entry = proc_mkdir("fs/nfs", NULL);
1210 if (!entry)
1211 return -ENOMEM;
1212 entry = proc_create("exports", 0, entry,
1213 &exports_proc_operations);
1214 if (!entry) {
1215 remove_proc_entry("fs/nfs", NULL);
1216 return -ENOMEM;
1217 }
1218 return 0;
1219}
1220#else /* CONFIG_PROC_FS */
1221static int create_proc_exports_entry(void)
1222{
1223 return 0;
1224}
1225#endif
1226
1227unsigned int nfsd_net_id;
1228
1229static __net_init int nfsd_init_net(struct net *net)
1230{
1231 int retval;
1232 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1233
1234 retval = nfsd_export_init(net);
1235 if (retval)
1236 goto out_export_error;
1237 retval = nfsd_idmap_init(net);
1238 if (retval)
1239 goto out_idmap_error;
1240 nn->nfsd4_lease = 90; /* default lease time */
1241 nn->nfsd4_grace = 90;
1242 nn->clverifier_counter = prandom_u32();
1243 nn->clientid_counter = prandom_u32();
1244
1245 atomic_set(&nn->ntf_refcnt, 0);
1246 init_waitqueue_head(&nn->ntf_wq);
1247 return 0;
1248
1249out_idmap_error:
1250 nfsd_export_shutdown(net);
1251out_export_error:
1252 return retval;
1253}
1254
1255static __net_exit void nfsd_exit_net(struct net *net)
1256{
1257 nfsd_idmap_shutdown(net);
1258 nfsd_export_shutdown(net);
1259}
1260
1261static struct pernet_operations nfsd_net_ops = {
1262 .init = nfsd_init_net,
1263 .exit = nfsd_exit_net,
1264 .id = &nfsd_net_id,
1265 .size = sizeof(struct nfsd_net),
1266};
1267
1268static int __init init_nfsd(void)
1269{
1270 int retval;
1271 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1272
1273 retval = register_pernet_subsys(&nfsd_net_ops);
1274 if (retval < 0)
1275 return retval;
1276 retval = register_cld_notifier();
1277 if (retval)
1278 goto out_unregister_pernet;
1279 retval = nfsd4_init_slabs();
1280 if (retval)
1281 goto out_unregister_notifier;
1282 retval = nfsd4_init_pnfs();
1283 if (retval)
1284 goto out_free_slabs;
1285 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1286 if (retval)
1287 goto out_exit_pnfs;
1288 nfsd_stat_init(); /* Statistics */
1289 retval = nfsd_reply_cache_init();
1290 if (retval)
1291 goto out_free_stat;
1292 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1293 retval = create_proc_exports_entry();
1294 if (retval)
1295 goto out_free_lockd;
1296 retval = register_filesystem(&nfsd_fs_type);
1297 if (retval)
1298 goto out_free_all;
1299 return 0;
1300out_free_all:
1301 remove_proc_entry("fs/nfs/exports", NULL);
1302 remove_proc_entry("fs/nfs", NULL);
1303out_free_lockd:
1304 nfsd_lockd_shutdown();
1305 nfsd_reply_cache_shutdown();
1306out_free_stat:
1307 nfsd_stat_shutdown();
1308 nfsd_fault_inject_cleanup();
1309out_exit_pnfs:
1310 nfsd4_exit_pnfs();
1311out_free_slabs:
1312 nfsd4_free_slabs();
1313out_unregister_notifier:
1314 unregister_cld_notifier();
1315out_unregister_pernet:
1316 unregister_pernet_subsys(&nfsd_net_ops);
1317 return retval;
1318}
1319
1320static void __exit exit_nfsd(void)
1321{
1322 nfsd_reply_cache_shutdown();
1323 remove_proc_entry("fs/nfs/exports", NULL);
1324 remove_proc_entry("fs/nfs", NULL);
1325 nfsd_stat_shutdown();
1326 nfsd_lockd_shutdown();
1327 nfsd4_free_slabs();
1328 nfsd4_exit_pnfs();
1329 nfsd_fault_inject_cleanup();
1330 unregister_filesystem(&nfsd_fs_type);
1331 unregister_cld_notifier();
1332 unregister_pernet_subsys(&nfsd_net_ops);
1333}
1334
1335MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1336MODULE_LICENSE("GPL");
1337module_init(init_nfsd)
1338module_exit(exit_nfsd)