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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// 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/rpc_pipe_fs.h>
18#include <linux/sunrpc/svc.h>
19#include <linux/module.h>
20#include <linux/fsnotify.h>
21#include <linux/nfslocalio.h>
22
23#include "idmap.h"
24#include "nfsd.h"
25#include "cache.h"
26#include "state.h"
27#include "netns.h"
28#include "pnfs.h"
29#include "filecache.h"
30#include "trace.h"
31#include "netlink.h"
32
33/*
34 * We have a single directory with several nodes in it.
35 */
36enum {
37 NFSD_Root = 1,
38 NFSD_List,
39 NFSD_Export_Stats,
40 NFSD_Export_features,
41 NFSD_Fh,
42 NFSD_FO_UnlockIP,
43 NFSD_FO_UnlockFS,
44 NFSD_Threads,
45 NFSD_Pool_Threads,
46 NFSD_Pool_Stats,
47 NFSD_Reply_Cache_Stats,
48 NFSD_Versions,
49 NFSD_Ports,
50 NFSD_MaxBlkSize,
51 NFSD_MaxConnections,
52 NFSD_Filecache,
53 NFSD_Leasetime,
54 NFSD_Gracetime,
55 NFSD_RecoveryDir,
56 NFSD_V4EndGrace,
57 NFSD_MaxReserved
58};
59
60/*
61 * write() for these nodes.
62 */
63static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
64static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
65static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
66static ssize_t write_threads(struct file *file, char *buf, size_t size);
67static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
68static ssize_t write_versions(struct file *file, char *buf, size_t size);
69static ssize_t write_ports(struct file *file, char *buf, size_t size);
70static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
71static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
72#ifdef CONFIG_NFSD_V4
73static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
74static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
75#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
76static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
77#endif
78static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
79#endif
80
81static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
82 [NFSD_Fh] = write_filehandle,
83 [NFSD_FO_UnlockIP] = write_unlock_ip,
84 [NFSD_FO_UnlockFS] = write_unlock_fs,
85 [NFSD_Threads] = write_threads,
86 [NFSD_Pool_Threads] = write_pool_threads,
87 [NFSD_Versions] = write_versions,
88 [NFSD_Ports] = write_ports,
89 [NFSD_MaxBlkSize] = write_maxblksize,
90 [NFSD_MaxConnections] = write_maxconn,
91#ifdef CONFIG_NFSD_V4
92 [NFSD_Leasetime] = write_leasetime,
93 [NFSD_Gracetime] = write_gracetime,
94#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
95 [NFSD_RecoveryDir] = write_recoverydir,
96#endif
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 return rv;
117
118 simple_transaction_set(file, rv);
119 return size;
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_nfsd_open(struct inode *inode, struct file *file)
159{
160 return exports_net_open(inode->i_sb->s_fs_info, file);
161}
162
163static const struct file_operations exports_nfsd_operations = {
164 .open = exports_nfsd_open,
165 .read = seq_read,
166 .llseek = seq_lseek,
167 .release = seq_release,
168};
169
170static int export_features_show(struct seq_file *m, void *v)
171{
172 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
173 return 0;
174}
175
176DEFINE_SHOW_ATTRIBUTE(export_features);
177
178static int nfsd_pool_stats_open(struct inode *inode, struct file *file)
179{
180 struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
181
182 return svc_pool_stats_open(&nn->nfsd_info, file);
183}
184
185static const struct file_operations pool_stats_operations = {
186 .open = nfsd_pool_stats_open,
187 .read = seq_read,
188 .llseek = seq_lseek,
189 .release = seq_release,
190};
191
192DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
193
194DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
195
196/*----------------------------------------------------------------------------*/
197/*
198 * payload - write methods
199 */
200
201static inline struct net *netns(struct file *file)
202{
203 return file_inode(file)->i_sb->s_fs_info;
204}
205
206/*
207 * write_unlock_ip - Release all locks used by a client
208 *
209 * Experimental.
210 *
211 * Input:
212 * buf: '\n'-terminated C string containing a
213 * presentation format IP address
214 * size: length of C string in @buf
215 * Output:
216 * On success: returns zero if all specified locks were released;
217 * returns one if one or more locks were not released
218 * On error: return code is negative errno value
219 */
220static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
221{
222 struct sockaddr_storage address;
223 struct sockaddr *sap = (struct sockaddr *)&address;
224 size_t salen = sizeof(address);
225 char *fo_path;
226 struct net *net = netns(file);
227
228 /* sanity check */
229 if (size == 0)
230 return -EINVAL;
231
232 if (buf[size-1] != '\n')
233 return -EINVAL;
234
235 fo_path = buf;
236 if (qword_get(&buf, fo_path, size) < 0)
237 return -EINVAL;
238
239 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
240 return -EINVAL;
241
242 trace_nfsd_ctl_unlock_ip(net, buf);
243 return nlmsvc_unlock_all_by_ip(sap);
244}
245
246/*
247 * write_unlock_fs - Release all locks on a local file system
248 *
249 * Experimental.
250 *
251 * Input:
252 * buf: '\n'-terminated C string containing the
253 * absolute pathname of a local file system
254 * size: length of C string in @buf
255 * Output:
256 * On success: returns zero if all specified locks were released;
257 * returns one if one or more locks were not released
258 * On error: return code is negative errno value
259 */
260static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
261{
262 struct path path;
263 char *fo_path;
264 int error;
265
266 /* sanity check */
267 if (size == 0)
268 return -EINVAL;
269
270 if (buf[size-1] != '\n')
271 return -EINVAL;
272
273 fo_path = buf;
274 if (qword_get(&buf, fo_path, size) < 0)
275 return -EINVAL;
276 trace_nfsd_ctl_unlock_fs(netns(file), fo_path);
277 error = kern_path(fo_path, 0, &path);
278 if (error)
279 return error;
280
281 /*
282 * XXX: Needs better sanity checking. Otherwise we could end up
283 * releasing locks on the wrong file system.
284 *
285 * For example:
286 * 1. Does the path refer to a directory?
287 * 2. Is that directory a mount point, or
288 * 3. Is that directory the root of an exported file system?
289 */
290 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
291 nfsd4_revoke_states(netns(file), path.dentry->d_sb);
292
293 path_put(&path);
294 return error;
295}
296
297/*
298 * write_filehandle - Get a variable-length NFS file handle by path
299 *
300 * On input, the buffer contains a '\n'-terminated C string comprised of
301 * three alphanumeric words separated by whitespace. The string may
302 * contain escape sequences.
303 *
304 * Input:
305 * buf:
306 * domain: client domain name
307 * path: export pathname
308 * maxsize: numeric maximum size of
309 * @buf
310 * size: length of C string in @buf
311 * Output:
312 * On success: passed-in buffer filled with '\n'-terminated C
313 * string containing a ASCII hex text version
314 * of the NFS file handle;
315 * return code is the size in bytes of the string
316 * On error: return code is negative errno value
317 */
318static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
319{
320 char *dname, *path;
321 int maxsize;
322 char *mesg = buf;
323 int len;
324 struct auth_domain *dom;
325 struct knfsd_fh fh;
326
327 if (size == 0)
328 return -EINVAL;
329
330 if (buf[size-1] != '\n')
331 return -EINVAL;
332 buf[size-1] = 0;
333
334 dname = mesg;
335 len = qword_get(&mesg, dname, size);
336 if (len <= 0)
337 return -EINVAL;
338
339 path = dname+len+1;
340 len = qword_get(&mesg, path, size);
341 if (len <= 0)
342 return -EINVAL;
343
344 len = get_int(&mesg, &maxsize);
345 if (len)
346 return len;
347
348 if (maxsize < NFS_FHSIZE)
349 return -EINVAL;
350 maxsize = min(maxsize, NFS3_FHSIZE);
351
352 if (qword_get(&mesg, mesg, size) > 0)
353 return -EINVAL;
354
355 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize);
356
357 /* we have all the words, they are in buf.. */
358 dom = unix_domain_find(dname);
359 if (!dom)
360 return -ENOMEM;
361
362 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
363 auth_domain_put(dom);
364 if (len)
365 return len;
366
367 mesg = buf;
368 len = SIMPLE_TRANSACTION_LIMIT;
369 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
370 mesg[-1] = '\n';
371 return mesg - buf;
372}
373
374/*
375 * write_threads - Start NFSD, or report the current number of running threads
376 *
377 * Input:
378 * buf: ignored
379 * size: zero
380 * Output:
381 * On success: passed-in buffer filled with '\n'-terminated C
382 * string numeric value representing the number of
383 * running NFSD threads;
384 * return code is the size in bytes of the string
385 * On error: return code is zero
386 *
387 * OR
388 *
389 * Input:
390 * buf: C string containing an unsigned
391 * integer value representing the
392 * number of NFSD threads to start
393 * size: non-zero length of C string in @buf
394 * Output:
395 * On success: NFS service is started;
396 * passed-in buffer filled with '\n'-terminated C
397 * string numeric value representing the number of
398 * running NFSD threads;
399 * return code is the size in bytes of the string
400 * On error: return code is zero or a negative errno value
401 */
402static ssize_t write_threads(struct file *file, char *buf, size_t size)
403{
404 char *mesg = buf;
405 int rv;
406 struct net *net = netns(file);
407
408 if (size > 0) {
409 int newthreads;
410 rv = get_int(&mesg, &newthreads);
411 if (rv)
412 return rv;
413 if (newthreads < 0)
414 return -EINVAL;
415 trace_nfsd_ctl_threads(net, newthreads);
416 mutex_lock(&nfsd_mutex);
417 rv = nfsd_svc(1, &newthreads, net, file->f_cred, NULL);
418 mutex_unlock(&nfsd_mutex);
419 if (rv < 0)
420 return rv;
421 } else
422 rv = nfsd_nrthreads(net);
423
424 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
425}
426
427/*
428 * write_pool_threads - Set or report the current number of threads per pool
429 *
430 * Input:
431 * buf: ignored
432 * size: zero
433 *
434 * OR
435 *
436 * Input:
437 * buf: C string containing whitespace-
438 * separated unsigned integer values
439 * representing the number of NFSD
440 * threads to start in each pool
441 * size: non-zero length of C string in @buf
442 * Output:
443 * On success: passed-in buffer filled with '\n'-terminated C
444 * string containing integer values representing the
445 * number of NFSD threads in each pool;
446 * return code is the size in bytes of the string
447 * On error: return code is zero or a negative errno value
448 */
449static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
450{
451 /* if size > 0, look for an array of number of threads per node
452 * and apply them then write out number of threads per node as reply
453 */
454 char *mesg = buf;
455 int i;
456 int rv;
457 int len;
458 int npools;
459 int *nthreads;
460 struct net *net = netns(file);
461
462 mutex_lock(&nfsd_mutex);
463 npools = nfsd_nrpools(net);
464 if (npools == 0) {
465 /*
466 * NFS is shut down. The admin can start it by
467 * writing to the threads file but NOT the pool_threads
468 * file, sorry. Report zero threads.
469 */
470 mutex_unlock(&nfsd_mutex);
471 strcpy(buf, "0\n");
472 return strlen(buf);
473 }
474
475 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
476 rv = -ENOMEM;
477 if (nthreads == NULL)
478 goto out_free;
479
480 if (size > 0) {
481 for (i = 0; i < npools; i++) {
482 rv = get_int(&mesg, &nthreads[i]);
483 if (rv == -ENOENT)
484 break; /* fewer numbers than pools */
485 if (rv)
486 goto out_free; /* syntax error */
487 rv = -EINVAL;
488 if (nthreads[i] < 0)
489 goto out_free;
490 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]);
491 }
492
493 /*
494 * There must always be a thread in pool 0; the admin
495 * can't shut down NFS completely using pool_threads.
496 */
497 if (nthreads[0] == 0)
498 nthreads[0] = 1;
499
500 rv = nfsd_set_nrthreads(i, nthreads, net);
501 if (rv)
502 goto out_free;
503 }
504
505 rv = nfsd_get_nrthreads(npools, nthreads, net);
506 if (rv)
507 goto out_free;
508
509 mesg = buf;
510 size = SIMPLE_TRANSACTION_LIMIT;
511 for (i = 0; i < npools && size > 0; i++) {
512 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
513 len = strlen(mesg);
514 size -= len;
515 mesg += len;
516 }
517 rv = mesg - buf;
518out_free:
519 kfree(nthreads);
520 mutex_unlock(&nfsd_mutex);
521 return rv;
522}
523
524static ssize_t
525nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
526 const char *sep, unsigned vers, int minor)
527{
528 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
529 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
530
531 if (vers == 4 && minor >= 0 &&
532 !nfsd_minorversion(nn, minor, NFSD_TEST))
533 supported = false;
534 if (minor == 0 && supported)
535 /*
536 * special case for backward compatability.
537 * +4.0 is never reported, it is implied by
538 * +4, unless -4.0 is present.
539 */
540 return 0;
541 return snprintf(buf, remaining, format, sep,
542 supported ? '+' : '-', vers, minor);
543}
544
545static ssize_t __write_versions(struct file *file, char *buf, size_t size)
546{
547 char *mesg = buf;
548 char *vers, *minorp, sign;
549 int len, num, remaining;
550 ssize_t tlen = 0;
551 char *sep;
552 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
553
554 if (size > 0) {
555 if (nn->nfsd_serv)
556 /* Cannot change versions without updating
557 * nn->nfsd_serv->sv_xdrsize, and reallocing
558 * rq_argp and rq_resp
559 */
560 return -EBUSY;
561 if (buf[size-1] != '\n')
562 return -EINVAL;
563 buf[size-1] = 0;
564 trace_nfsd_ctl_version(netns(file), buf);
565
566 vers = mesg;
567 len = qword_get(&mesg, vers, size);
568 if (len <= 0) return -EINVAL;
569 do {
570 enum vers_op cmd;
571 unsigned minor;
572 sign = *vers;
573 if (sign == '+' || sign == '-')
574 num = simple_strtol((vers+1), &minorp, 0);
575 else
576 num = simple_strtol(vers, &minorp, 0);
577 if (*minorp == '.') {
578 if (num != 4)
579 return -EINVAL;
580 if (kstrtouint(minorp+1, 0, &minor) < 0)
581 return -EINVAL;
582 }
583
584 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
585 switch(num) {
586#ifdef CONFIG_NFSD_V2
587 case 2:
588#endif
589 case 3:
590 nfsd_vers(nn, num, cmd);
591 break;
592 case 4:
593 if (*minorp == '.') {
594 if (nfsd_minorversion(nn, minor, cmd) < 0)
595 return -EINVAL;
596 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
597 /*
598 * Either we have +4 and no minors are enabled,
599 * or we have -4 and at least one minor is enabled.
600 * In either case, propagate 'cmd' to all minors.
601 */
602 minor = 0;
603 while (nfsd_minorversion(nn, minor, cmd) >= 0)
604 minor++;
605 }
606 break;
607 default:
608 /* Ignore requests to disable non-existent versions */
609 if (cmd == NFSD_SET)
610 return -EINVAL;
611 }
612 vers += len + 1;
613 } while ((len = qword_get(&mesg, vers, size)) > 0);
614 /* If all get turned off, turn them back on, as
615 * having no versions is BAD
616 */
617 nfsd_reset_versions(nn);
618 }
619
620 /* Now write current state into reply buffer */
621 sep = "";
622 remaining = SIMPLE_TRANSACTION_LIMIT;
623 for (num=2 ; num <= 4 ; num++) {
624 int minor;
625 if (!nfsd_vers(nn, num, NFSD_AVAIL))
626 continue;
627
628 minor = -1;
629 do {
630 len = nfsd_print_version_support(nn, buf, remaining,
631 sep, num, minor);
632 if (len >= remaining)
633 goto out;
634 remaining -= len;
635 buf += len;
636 tlen += len;
637 minor++;
638 if (len)
639 sep = " ";
640 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
641 }
642out:
643 len = snprintf(buf, remaining, "\n");
644 if (len >= remaining)
645 return -EINVAL;
646 return tlen + len;
647}
648
649/*
650 * write_versions - Set or report the available NFS protocol versions
651 *
652 * Input:
653 * buf: ignored
654 * size: zero
655 * Output:
656 * On success: passed-in buffer filled with '\n'-terminated C
657 * string containing positive or negative integer
658 * values representing the current status of each
659 * protocol version;
660 * return code is the size in bytes of the string
661 * On error: return code is zero or a negative errno value
662 *
663 * OR
664 *
665 * Input:
666 * buf: C string containing whitespace-
667 * separated positive or negative
668 * integer values representing NFS
669 * protocol versions to enable ("+n")
670 * or disable ("-n")
671 * size: non-zero length of C string in @buf
672 * Output:
673 * On success: status of zero or more protocol versions has
674 * been updated; passed-in buffer filled with
675 * '\n'-terminated C string containing positive
676 * or negative integer values representing the
677 * current status of each protocol version;
678 * return code is the size in bytes of the string
679 * On error: return code is zero or a negative errno value
680 */
681static ssize_t write_versions(struct file *file, char *buf, size_t size)
682{
683 ssize_t rv;
684
685 mutex_lock(&nfsd_mutex);
686 rv = __write_versions(file, buf, size);
687 mutex_unlock(&nfsd_mutex);
688 return rv;
689}
690
691/*
692 * Zero-length write. Return a list of NFSD's current listener
693 * transports.
694 */
695static ssize_t __write_ports_names(char *buf, struct net *net)
696{
697 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
698
699 if (nn->nfsd_serv == NULL)
700 return 0;
701 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
702}
703
704/*
705 * A single 'fd' number was written, in which case it must be for
706 * a socket of a supported family/protocol, and we use it as an
707 * nfsd listener.
708 */
709static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
710{
711 char *mesg = buf;
712 int fd, err;
713 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
714 struct svc_serv *serv;
715
716 err = get_int(&mesg, &fd);
717 if (err != 0 || fd < 0)
718 return -EINVAL;
719 trace_nfsd_ctl_ports_addfd(net, fd);
720
721 err = nfsd_create_serv(net);
722 if (err != 0)
723 return err;
724
725 serv = nn->nfsd_serv;
726 err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
727
728 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
729 nfsd_destroy_serv(net);
730
731 return err;
732}
733
734/*
735 * A transport listener is added by writing its transport name and
736 * a port number.
737 */
738static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
739{
740 char transport[16];
741 struct svc_xprt *xprt;
742 int port, err;
743 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
744 struct svc_serv *serv;
745
746 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
747 return -EINVAL;
748
749 if (port < 1 || port > USHRT_MAX)
750 return -EINVAL;
751 trace_nfsd_ctl_ports_addxprt(net, transport, port);
752
753 err = nfsd_create_serv(net);
754 if (err != 0)
755 return err;
756
757 serv = nn->nfsd_serv;
758 err = svc_xprt_create(serv, transport, net,
759 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
760 if (err < 0)
761 goto out_err;
762
763 err = svc_xprt_create(serv, transport, net,
764 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
765 if (err < 0 && err != -EAFNOSUPPORT)
766 goto out_close;
767
768 return 0;
769out_close:
770 xprt = svc_find_xprt(serv, transport, net, PF_INET, port);
771 if (xprt != NULL) {
772 svc_xprt_close(xprt);
773 svc_xprt_put(xprt);
774 }
775out_err:
776 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
777 nfsd_destroy_serv(net);
778
779 return err;
780}
781
782static ssize_t __write_ports(struct file *file, char *buf, size_t size,
783 struct net *net)
784{
785 if (size == 0)
786 return __write_ports_names(buf, net);
787
788 if (isdigit(buf[0]))
789 return __write_ports_addfd(buf, net, file->f_cred);
790
791 if (isalpha(buf[0]))
792 return __write_ports_addxprt(buf, net, file->f_cred);
793
794 return -EINVAL;
795}
796
797/*
798 * write_ports - Pass a socket file descriptor or transport name to listen on
799 *
800 * Input:
801 * buf: ignored
802 * size: zero
803 * Output:
804 * On success: passed-in buffer filled with a '\n'-terminated C
805 * string containing a whitespace-separated list of
806 * named NFSD listeners;
807 * return code is the size in bytes of the string
808 * On error: return code is zero or a negative errno value
809 *
810 * OR
811 *
812 * Input:
813 * buf: C string containing an unsigned
814 * integer value representing a bound
815 * but unconnected socket that is to be
816 * used as an NFSD listener; listen(3)
817 * must be called for a SOCK_STREAM
818 * socket, otherwise it is ignored
819 * size: non-zero length of C string in @buf
820 * Output:
821 * On success: NFS service is started;
822 * passed-in buffer filled with a '\n'-terminated C
823 * string containing a unique alphanumeric name of
824 * the listener;
825 * return code is the size in bytes of the string
826 * On error: return code is a negative errno value
827 *
828 * OR
829 *
830 * Input:
831 * buf: C string containing a transport
832 * name and an unsigned integer value
833 * representing the port to listen on,
834 * separated by whitespace
835 * size: non-zero length of C string in @buf
836 * Output:
837 * On success: returns zero; NFS service is started
838 * On error: return code is a negative errno value
839 */
840static ssize_t write_ports(struct file *file, char *buf, size_t size)
841{
842 ssize_t rv;
843
844 mutex_lock(&nfsd_mutex);
845 rv = __write_ports(file, buf, size, netns(file));
846 mutex_unlock(&nfsd_mutex);
847 return rv;
848}
849
850
851int nfsd_max_blksize;
852
853/*
854 * write_maxblksize - Set or report the current NFS blksize
855 *
856 * Input:
857 * buf: ignored
858 * size: zero
859 *
860 * OR
861 *
862 * Input:
863 * buf: C string containing an unsigned
864 * integer value representing the new
865 * NFS blksize
866 * size: non-zero length of C string in @buf
867 * Output:
868 * On success: passed-in buffer filled with '\n'-terminated C string
869 * containing numeric value of the current NFS blksize
870 * setting;
871 * return code is the size in bytes of the string
872 * On error: return code is zero or a negative errno value
873 */
874static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
875{
876 char *mesg = buf;
877 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
878
879 if (size > 0) {
880 int bsize;
881 int rv = get_int(&mesg, &bsize);
882 if (rv)
883 return rv;
884 trace_nfsd_ctl_maxblksize(netns(file), bsize);
885
886 /* force bsize into allowed range and
887 * required alignment.
888 */
889 bsize = max_t(int, bsize, 1024);
890 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
891 bsize &= ~(1024-1);
892 mutex_lock(&nfsd_mutex);
893 if (nn->nfsd_serv) {
894 mutex_unlock(&nfsd_mutex);
895 return -EBUSY;
896 }
897 nfsd_max_blksize = bsize;
898 mutex_unlock(&nfsd_mutex);
899 }
900
901 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
902 nfsd_max_blksize);
903}
904
905/*
906 * write_maxconn - Set or report the current max number of connections
907 *
908 * Input:
909 * buf: ignored
910 * size: zero
911 * OR
912 *
913 * Input:
914 * buf: C string containing an unsigned
915 * integer value representing the new
916 * number of max connections
917 * size: non-zero length of C string in @buf
918 * Output:
919 * On success: passed-in buffer filled with '\n'-terminated C string
920 * containing numeric value of max_connections setting
921 * for this net namespace;
922 * return code is the size in bytes of the string
923 * On error: return code is zero or a negative errno value
924 */
925static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
926{
927 char *mesg = buf;
928 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
929 unsigned int maxconn = nn->max_connections;
930
931 if (size > 0) {
932 int rv = get_uint(&mesg, &maxconn);
933
934 if (rv)
935 return rv;
936 trace_nfsd_ctl_maxconn(netns(file), maxconn);
937 nn->max_connections = maxconn;
938 }
939
940 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
941}
942
943#ifdef CONFIG_NFSD_V4
944static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
945 time64_t *time, struct nfsd_net *nn)
946{
947 struct dentry *dentry = file_dentry(file);
948 char *mesg = buf;
949 int rv, i;
950
951 if (size > 0) {
952 if (nn->nfsd_serv)
953 return -EBUSY;
954 rv = get_int(&mesg, &i);
955 if (rv)
956 return rv;
957 trace_nfsd_ctl_time(netns(file), dentry->d_name.name,
958 dentry->d_name.len, i);
959
960 /*
961 * Some sanity checking. We don't have a reason for
962 * these particular numbers, but problems with the
963 * extremes are:
964 * - Too short: the briefest network outage may
965 * cause clients to lose all their locks. Also,
966 * the frequent polling may be wasteful.
967 * - Too long: do you really want reboot recovery
968 * to take more than an hour? Or to make other
969 * clients wait an hour before being able to
970 * revoke a dead client's locks?
971 */
972 if (i < 10 || i > 3600)
973 return -EINVAL;
974 *time = i;
975 }
976
977 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
978}
979
980static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
981 time64_t *time, struct nfsd_net *nn)
982{
983 ssize_t rv;
984
985 mutex_lock(&nfsd_mutex);
986 rv = __nfsd4_write_time(file, buf, size, time, nn);
987 mutex_unlock(&nfsd_mutex);
988 return rv;
989}
990
991/*
992 * write_leasetime - Set or report the current NFSv4 lease time
993 *
994 * Input:
995 * buf: ignored
996 * size: zero
997 *
998 * OR
999 *
1000 * Input:
1001 * buf: C string containing an unsigned
1002 * integer value representing the new
1003 * NFSv4 lease expiry time
1004 * size: non-zero length of C string in @buf
1005 * Output:
1006 * On success: passed-in buffer filled with '\n'-terminated C
1007 * string containing unsigned integer value of the
1008 * current lease expiry time;
1009 * return code is the size in bytes of the string
1010 * On error: return code is zero or a negative errno value
1011 */
1012static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1013{
1014 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1015 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1016}
1017
1018/*
1019 * write_gracetime - Set or report current NFSv4 grace period time
1020 *
1021 * As above, but sets the time of the NFSv4 grace period.
1022 *
1023 * Note this should never be set to less than the *previous*
1024 * lease-period time, but we don't try to enforce this. (In the common
1025 * case (a new boot), we don't know what the previous lease time was
1026 * anyway.)
1027 */
1028static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1029{
1030 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1031 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1032}
1033
1034#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1035static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1036 struct nfsd_net *nn)
1037{
1038 char *mesg = buf;
1039 char *recdir;
1040 int len, status;
1041
1042 if (size > 0) {
1043 if (nn->nfsd_serv)
1044 return -EBUSY;
1045 if (size > PATH_MAX || buf[size-1] != '\n')
1046 return -EINVAL;
1047 buf[size-1] = 0;
1048
1049 recdir = mesg;
1050 len = qword_get(&mesg, recdir, size);
1051 if (len <= 0)
1052 return -EINVAL;
1053 trace_nfsd_ctl_recoverydir(netns(file), recdir);
1054
1055 status = nfs4_reset_recoverydir(recdir);
1056 if (status)
1057 return status;
1058 }
1059
1060 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1061 nfs4_recoverydir());
1062}
1063
1064/*
1065 * write_recoverydir - Set or report the pathname of the recovery directory
1066 *
1067 * Input:
1068 * buf: ignored
1069 * size: zero
1070 *
1071 * OR
1072 *
1073 * Input:
1074 * buf: C string containing the pathname
1075 * of the directory on a local file
1076 * system containing permanent NFSv4
1077 * recovery data
1078 * size: non-zero length of C string in @buf
1079 * Output:
1080 * On success: passed-in buffer filled with '\n'-terminated C string
1081 * containing the current recovery pathname setting;
1082 * return code is the size in bytes of the string
1083 * On error: return code is zero or a negative errno value
1084 */
1085static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1086{
1087 ssize_t rv;
1088 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1089
1090 mutex_lock(&nfsd_mutex);
1091 rv = __write_recoverydir(file, buf, size, nn);
1092 mutex_unlock(&nfsd_mutex);
1093 return rv;
1094}
1095#endif
1096
1097/*
1098 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1099 *
1100 * Input:
1101 * buf: ignored
1102 * size: zero
1103 * OR
1104 *
1105 * Input:
1106 * buf: any value
1107 * size: non-zero length of C string in @buf
1108 * Output:
1109 * passed-in buffer filled with "Y" or "N" with a newline
1110 * and NULL-terminated C string. This indicates whether
1111 * the grace period has ended in the current net
1112 * namespace. Return code is the size in bytes of the
1113 * string. Writing a string that starts with 'Y', 'y', or
1114 * '1' to the file will end the grace period for nfsd's v4
1115 * lock manager.
1116 */
1117static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1118{
1119 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1120
1121 if (size > 0) {
1122 switch(buf[0]) {
1123 case 'Y':
1124 case 'y':
1125 case '1':
1126 if (!nn->nfsd_serv)
1127 return -EBUSY;
1128 trace_nfsd_end_grace(netns(file));
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
1147/* Basically copying rpc_get_inode. */
1148static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1149{
1150 struct inode *inode = new_inode(sb);
1151 if (!inode)
1152 return NULL;
1153 /* Following advice from simple_fill_super documentation: */
1154 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1155 inode->i_mode = mode;
1156 simple_inode_init_ts(inode);
1157 switch (mode & S_IFMT) {
1158 case S_IFDIR:
1159 inode->i_fop = &simple_dir_operations;
1160 inode->i_op = &simple_dir_inode_operations;
1161 inc_nlink(inode);
1162 break;
1163 case S_IFLNK:
1164 inode->i_op = &simple_symlink_inode_operations;
1165 break;
1166 default:
1167 break;
1168 }
1169 return inode;
1170}
1171
1172static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1173{
1174 struct inode *inode;
1175
1176 inode = nfsd_get_inode(dir->i_sb, mode);
1177 if (!inode)
1178 return -ENOMEM;
1179 if (ncl) {
1180 inode->i_private = ncl;
1181 kref_get(&ncl->cl_ref);
1182 }
1183 d_add(dentry, inode);
1184 inc_nlink(dir);
1185 fsnotify_mkdir(dir, dentry);
1186 return 0;
1187}
1188
1189static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1190{
1191 struct inode *dir = parent->d_inode;
1192 struct dentry *dentry;
1193 int ret = -ENOMEM;
1194
1195 inode_lock(dir);
1196 dentry = d_alloc_name(parent, name);
1197 if (!dentry)
1198 goto out_err;
1199 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1200 if (ret)
1201 goto out_err;
1202out:
1203 inode_unlock(dir);
1204 return dentry;
1205out_err:
1206 dput(dentry);
1207 dentry = ERR_PTR(ret);
1208 goto out;
1209}
1210
1211#if IS_ENABLED(CONFIG_SUNRPC_GSS)
1212static int __nfsd_symlink(struct inode *dir, struct dentry *dentry,
1213 umode_t mode, const char *content)
1214{
1215 struct inode *inode;
1216
1217 inode = nfsd_get_inode(dir->i_sb, mode);
1218 if (!inode)
1219 return -ENOMEM;
1220
1221 inode->i_link = (char *)content;
1222 inode->i_size = strlen(content);
1223
1224 d_add(dentry, inode);
1225 inc_nlink(dir);
1226 fsnotify_create(dir, dentry);
1227 return 0;
1228}
1229
1230/*
1231 * @content is assumed to be a NUL-terminated string that lives
1232 * longer than the symlink itself.
1233 */
1234static void _nfsd_symlink(struct dentry *parent, const char *name,
1235 const char *content)
1236{
1237 struct inode *dir = parent->d_inode;
1238 struct dentry *dentry;
1239 int ret;
1240
1241 inode_lock(dir);
1242 dentry = d_alloc_name(parent, name);
1243 if (!dentry)
1244 goto out;
1245 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content);
1246 if (ret)
1247 dput(dentry);
1248out:
1249 inode_unlock(dir);
1250}
1251#else
1252static inline void _nfsd_symlink(struct dentry *parent, const char *name,
1253 const char *content)
1254{
1255}
1256
1257#endif
1258
1259static void clear_ncl(struct dentry *dentry)
1260{
1261 struct inode *inode = d_inode(dentry);
1262 struct nfsdfs_client *ncl = inode->i_private;
1263
1264 spin_lock(&inode->i_lock);
1265 inode->i_private = NULL;
1266 spin_unlock(&inode->i_lock);
1267 kref_put(&ncl->cl_ref, ncl->cl_release);
1268}
1269
1270struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1271{
1272 struct nfsdfs_client *nc;
1273
1274 spin_lock(&inode->i_lock);
1275 nc = inode->i_private;
1276 if (nc)
1277 kref_get(&nc->cl_ref);
1278 spin_unlock(&inode->i_lock);
1279 return nc;
1280}
1281
1282/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1283 * code instead. */
1284static int nfsdfs_create_files(struct dentry *root,
1285 const struct tree_descr *files,
1286 struct nfsdfs_client *ncl,
1287 struct dentry **fdentries)
1288{
1289 struct inode *dir = d_inode(root);
1290 struct inode *inode;
1291 struct dentry *dentry;
1292 int i;
1293
1294 inode_lock(dir);
1295 for (i = 0; files->name && files->name[0]; i++, files++) {
1296 dentry = d_alloc_name(root, files->name);
1297 if (!dentry)
1298 goto out;
1299 inode = nfsd_get_inode(d_inode(root)->i_sb,
1300 S_IFREG | files->mode);
1301 if (!inode) {
1302 dput(dentry);
1303 goto out;
1304 }
1305 kref_get(&ncl->cl_ref);
1306 inode->i_fop = files->ops;
1307 inode->i_private = ncl;
1308 d_add(dentry, inode);
1309 fsnotify_create(dir, dentry);
1310 if (fdentries)
1311 fdentries[i] = dentry;
1312 }
1313 inode_unlock(dir);
1314 return 0;
1315out:
1316 inode_unlock(dir);
1317 return -ENOMEM;
1318}
1319
1320/* on success, returns positive number unique to that client. */
1321struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1322 struct nfsdfs_client *ncl, u32 id,
1323 const struct tree_descr *files,
1324 struct dentry **fdentries)
1325{
1326 struct dentry *dentry;
1327 char name[11];
1328 int ret;
1329
1330 sprintf(name, "%u", id);
1331
1332 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1333 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1334 return NULL;
1335 ret = nfsdfs_create_files(dentry, files, ncl, fdentries);
1336 if (ret) {
1337 nfsd_client_rmdir(dentry);
1338 return NULL;
1339 }
1340 return dentry;
1341}
1342
1343/* Taken from __rpc_rmdir: */
1344void nfsd_client_rmdir(struct dentry *dentry)
1345{
1346 simple_recursive_removal(dentry, clear_ncl);
1347}
1348
1349static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1350{
1351 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1352 nfsd_net_id);
1353 struct dentry *dentry;
1354 int ret;
1355
1356 static const struct tree_descr nfsd_files[] = {
1357 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1358 /* Per-export io stats use same ops as exports file */
1359 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1360 [NFSD_Export_features] = {"export_features",
1361 &export_features_fops, S_IRUGO},
1362 [NFSD_FO_UnlockIP] = {"unlock_ip",
1363 &transaction_ops, S_IWUSR|S_IRUSR},
1364 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1365 &transaction_ops, S_IWUSR|S_IRUSR},
1366 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1367 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1368 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1369 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1370 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1371 &nfsd_reply_cache_stats_fops, S_IRUGO},
1372 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1373 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1374 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1375 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1376 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1377#ifdef CONFIG_NFSD_V4
1378 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1379 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1380#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1381 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1382#endif
1383 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1384#endif
1385 /* last one */ {""}
1386 };
1387
1388 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1389 if (ret)
1390 return ret;
1391 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes",
1392 "/proc/net/rpc/gss_krb5_enctypes");
1393 dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1394 if (IS_ERR(dentry))
1395 return PTR_ERR(dentry);
1396 nn->nfsd_client_dir = dentry;
1397 return 0;
1398}
1399
1400static int nfsd_fs_get_tree(struct fs_context *fc)
1401{
1402 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1403}
1404
1405static void nfsd_fs_free_fc(struct fs_context *fc)
1406{
1407 if (fc->s_fs_info)
1408 put_net(fc->s_fs_info);
1409}
1410
1411static const struct fs_context_operations nfsd_fs_context_ops = {
1412 .free = nfsd_fs_free_fc,
1413 .get_tree = nfsd_fs_get_tree,
1414};
1415
1416static int nfsd_init_fs_context(struct fs_context *fc)
1417{
1418 put_user_ns(fc->user_ns);
1419 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1420 fc->ops = &nfsd_fs_context_ops;
1421 return 0;
1422}
1423
1424static void nfsd_umount(struct super_block *sb)
1425{
1426 struct net *net = sb->s_fs_info;
1427
1428 nfsd_shutdown_threads(net);
1429
1430 kill_litter_super(sb);
1431 put_net(net);
1432}
1433
1434static struct file_system_type nfsd_fs_type = {
1435 .owner = THIS_MODULE,
1436 .name = "nfsd",
1437 .init_fs_context = nfsd_init_fs_context,
1438 .kill_sb = nfsd_umount,
1439};
1440MODULE_ALIAS_FS("nfsd");
1441
1442#ifdef CONFIG_PROC_FS
1443
1444static int exports_proc_open(struct inode *inode, struct file *file)
1445{
1446 return exports_net_open(current->nsproxy->net_ns, file);
1447}
1448
1449static const struct proc_ops exports_proc_ops = {
1450 .proc_open = exports_proc_open,
1451 .proc_read = seq_read,
1452 .proc_lseek = seq_lseek,
1453 .proc_release = seq_release,
1454};
1455
1456static int create_proc_exports_entry(void)
1457{
1458 struct proc_dir_entry *entry;
1459
1460 entry = proc_mkdir("fs/nfs", NULL);
1461 if (!entry)
1462 return -ENOMEM;
1463 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1464 if (!entry) {
1465 remove_proc_entry("fs/nfs", NULL);
1466 return -ENOMEM;
1467 }
1468 return 0;
1469}
1470#else /* CONFIG_PROC_FS */
1471static int create_proc_exports_entry(void)
1472{
1473 return 0;
1474}
1475#endif
1476
1477unsigned int nfsd_net_id;
1478
1479static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
1480 struct netlink_callback *cb,
1481 struct nfsd_genl_rqstp *rqstp)
1482{
1483 void *hdr;
1484 u32 i;
1485
1486 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1487 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET);
1488 if (!hdr)
1489 return -ENOBUFS;
1490
1491 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) ||
1492 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) ||
1493 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) ||
1494 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) ||
1495 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) ||
1496 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME,
1497 ktime_to_us(rqstp->rq_stime),
1498 NFSD_A_RPC_STATUS_PAD))
1499 return -ENOBUFS;
1500
1501 switch (rqstp->rq_saddr.sa_family) {
1502 case AF_INET: {
1503 const struct sockaddr_in *s_in, *d_in;
1504
1505 s_in = (const struct sockaddr_in *)&rqstp->rq_saddr;
1506 d_in = (const struct sockaddr_in *)&rqstp->rq_daddr;
1507 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4,
1508 s_in->sin_addr.s_addr) ||
1509 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4,
1510 d_in->sin_addr.s_addr) ||
1511 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1512 s_in->sin_port) ||
1513 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1514 d_in->sin_port))
1515 return -ENOBUFS;
1516 break;
1517 }
1518 case AF_INET6: {
1519 const struct sockaddr_in6 *s_in, *d_in;
1520
1521 s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr;
1522 d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr;
1523 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6,
1524 &s_in->sin6_addr) ||
1525 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6,
1526 &d_in->sin6_addr) ||
1527 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1528 s_in->sin6_port) ||
1529 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1530 d_in->sin6_port))
1531 return -ENOBUFS;
1532 break;
1533 }
1534 }
1535
1536 for (i = 0; i < rqstp->rq_opcnt; i++)
1537 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS,
1538 rqstp->rq_opnum[i]))
1539 return -ENOBUFS;
1540
1541 genlmsg_end(skb, hdr);
1542 return 0;
1543}
1544
1545/**
1546 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit
1547 * @skb: reply buffer
1548 * @cb: netlink metadata and command arguments
1549 *
1550 * Returns the size of the reply or a negative errno.
1551 */
1552int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
1553 struct netlink_callback *cb)
1554{
1555 int i, ret, rqstp_index = 0;
1556 struct nfsd_net *nn;
1557
1558 mutex_lock(&nfsd_mutex);
1559
1560 nn = net_generic(sock_net(skb->sk), nfsd_net_id);
1561 if (!nn->nfsd_serv) {
1562 ret = -ENODEV;
1563 goto out_unlock;
1564 }
1565
1566 rcu_read_lock();
1567
1568 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
1569 struct svc_rqst *rqstp;
1570
1571 if (i < cb->args[0]) /* already consumed */
1572 continue;
1573
1574 rqstp_index = 0;
1575 list_for_each_entry_rcu(rqstp,
1576 &nn->nfsd_serv->sv_pools[i].sp_all_threads,
1577 rq_all) {
1578 struct nfsd_genl_rqstp genl_rqstp;
1579 unsigned int status_counter;
1580
1581 if (rqstp_index++ < cb->args[1]) /* already consumed */
1582 continue;
1583 /*
1584 * Acquire rq_status_counter before parsing the rqst
1585 * fields. rq_status_counter is set to an odd value in
1586 * order to notify the consumers the rqstp fields are
1587 * meaningful.
1588 */
1589 status_counter =
1590 smp_load_acquire(&rqstp->rq_status_counter);
1591 if (!(status_counter & 1))
1592 continue;
1593
1594 genl_rqstp.rq_xid = rqstp->rq_xid;
1595 genl_rqstp.rq_flags = rqstp->rq_flags;
1596 genl_rqstp.rq_vers = rqstp->rq_vers;
1597 genl_rqstp.rq_prog = rqstp->rq_prog;
1598 genl_rqstp.rq_proc = rqstp->rq_proc;
1599 genl_rqstp.rq_stime = rqstp->rq_stime;
1600 genl_rqstp.rq_opcnt = 0;
1601 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
1602 sizeof(struct sockaddr));
1603 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
1604 sizeof(struct sockaddr));
1605
1606#ifdef CONFIG_NFSD_V4
1607 if (rqstp->rq_vers == NFS4_VERSION &&
1608 rqstp->rq_proc == NFSPROC4_COMPOUND) {
1609 /* NFSv4 compound */
1610 struct nfsd4_compoundargs *args;
1611 int j;
1612
1613 args = rqstp->rq_argp;
1614 genl_rqstp.rq_opcnt = args->opcnt;
1615 for (j = 0; j < genl_rqstp.rq_opcnt; j++)
1616 genl_rqstp.rq_opnum[j] =
1617 args->ops[j].opnum;
1618 }
1619#endif /* CONFIG_NFSD_V4 */
1620
1621 /*
1622 * Acquire rq_status_counter before reporting the rqst
1623 * fields to the user.
1624 */
1625 if (smp_load_acquire(&rqstp->rq_status_counter) !=
1626 status_counter)
1627 continue;
1628
1629 ret = nfsd_genl_rpc_status_compose_msg(skb, cb,
1630 &genl_rqstp);
1631 if (ret)
1632 goto out;
1633 }
1634 }
1635
1636 cb->args[0] = i;
1637 cb->args[1] = rqstp_index;
1638 ret = skb->len;
1639out:
1640 rcu_read_unlock();
1641out_unlock:
1642 mutex_unlock(&nfsd_mutex);
1643
1644 return ret;
1645}
1646
1647/**
1648 * nfsd_nl_threads_set_doit - set the number of running threads
1649 * @skb: reply buffer
1650 * @info: netlink metadata and command arguments
1651 *
1652 * Return 0 on success or a negative errno.
1653 */
1654int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info)
1655{
1656 int *nthreads, count = 0, nrpools, i, ret = -EOPNOTSUPP, rem;
1657 struct net *net = genl_info_net(info);
1658 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1659 const struct nlattr *attr;
1660 const char *scope = NULL;
1661
1662 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_THREADS))
1663 return -EINVAL;
1664
1665 /* count number of SERVER_THREADS values */
1666 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
1667 if (nla_type(attr) == NFSD_A_SERVER_THREADS)
1668 count++;
1669 }
1670
1671 mutex_lock(&nfsd_mutex);
1672
1673 nrpools = max(count, nfsd_nrpools(net));
1674 nthreads = kcalloc(nrpools, sizeof(int), GFP_KERNEL);
1675 if (!nthreads) {
1676 ret = -ENOMEM;
1677 goto out_unlock;
1678 }
1679
1680 i = 0;
1681 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
1682 if (nla_type(attr) == NFSD_A_SERVER_THREADS) {
1683 nthreads[i++] = nla_get_u32(attr);
1684 if (i >= nrpools)
1685 break;
1686 }
1687 }
1688
1689 if (info->attrs[NFSD_A_SERVER_GRACETIME] ||
1690 info->attrs[NFSD_A_SERVER_LEASETIME] ||
1691 info->attrs[NFSD_A_SERVER_SCOPE]) {
1692 ret = -EBUSY;
1693 if (nn->nfsd_serv && nn->nfsd_serv->sv_nrthreads)
1694 goto out_unlock;
1695
1696 ret = -EINVAL;
1697 attr = info->attrs[NFSD_A_SERVER_GRACETIME];
1698 if (attr) {
1699 u32 gracetime = nla_get_u32(attr);
1700
1701 if (gracetime < 10 || gracetime > 3600)
1702 goto out_unlock;
1703
1704 nn->nfsd4_grace = gracetime;
1705 }
1706
1707 attr = info->attrs[NFSD_A_SERVER_LEASETIME];
1708 if (attr) {
1709 u32 leasetime = nla_get_u32(attr);
1710
1711 if (leasetime < 10 || leasetime > 3600)
1712 goto out_unlock;
1713
1714 nn->nfsd4_lease = leasetime;
1715 }
1716
1717 attr = info->attrs[NFSD_A_SERVER_SCOPE];
1718 if (attr)
1719 scope = nla_data(attr);
1720 }
1721
1722 ret = nfsd_svc(nrpools, nthreads, net, get_current_cred(), scope);
1723 if (ret > 0)
1724 ret = 0;
1725out_unlock:
1726 mutex_unlock(&nfsd_mutex);
1727 kfree(nthreads);
1728 return ret;
1729}
1730
1731/**
1732 * nfsd_nl_threads_get_doit - get the number of running threads
1733 * @skb: reply buffer
1734 * @info: netlink metadata and command arguments
1735 *
1736 * Return 0 on success or a negative errno.
1737 */
1738int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info)
1739{
1740 struct net *net = genl_info_net(info);
1741 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1742 void *hdr;
1743 int err;
1744
1745 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
1746 if (!skb)
1747 return -ENOMEM;
1748
1749 hdr = genlmsg_iput(skb, info);
1750 if (!hdr) {
1751 err = -EMSGSIZE;
1752 goto err_free_msg;
1753 }
1754
1755 mutex_lock(&nfsd_mutex);
1756
1757 err = nla_put_u32(skb, NFSD_A_SERVER_GRACETIME,
1758 nn->nfsd4_grace) ||
1759 nla_put_u32(skb, NFSD_A_SERVER_LEASETIME,
1760 nn->nfsd4_lease) ||
1761 nla_put_string(skb, NFSD_A_SERVER_SCOPE,
1762 nn->nfsd_name);
1763 if (err)
1764 goto err_unlock;
1765
1766 if (nn->nfsd_serv) {
1767 int i;
1768
1769 for (i = 0; i < nfsd_nrpools(net); ++i) {
1770 struct svc_pool *sp = &nn->nfsd_serv->sv_pools[i];
1771
1772 err = nla_put_u32(skb, NFSD_A_SERVER_THREADS,
1773 sp->sp_nrthreads);
1774 if (err)
1775 goto err_unlock;
1776 }
1777 } else {
1778 err = nla_put_u32(skb, NFSD_A_SERVER_THREADS, 0);
1779 if (err)
1780 goto err_unlock;
1781 }
1782
1783 mutex_unlock(&nfsd_mutex);
1784
1785 genlmsg_end(skb, hdr);
1786
1787 return genlmsg_reply(skb, info);
1788
1789err_unlock:
1790 mutex_unlock(&nfsd_mutex);
1791err_free_msg:
1792 nlmsg_free(skb);
1793
1794 return err;
1795}
1796
1797/**
1798 * nfsd_nl_version_set_doit - set the nfs enabled versions
1799 * @skb: reply buffer
1800 * @info: netlink metadata and command arguments
1801 *
1802 * Return 0 on success or a negative errno.
1803 */
1804int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info)
1805{
1806 const struct nlattr *attr;
1807 struct nfsd_net *nn;
1808 int i, rem;
1809
1810 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_PROTO_VERSION))
1811 return -EINVAL;
1812
1813 mutex_lock(&nfsd_mutex);
1814
1815 nn = net_generic(genl_info_net(info), nfsd_net_id);
1816 if (nn->nfsd_serv) {
1817 mutex_unlock(&nfsd_mutex);
1818 return -EBUSY;
1819 }
1820
1821 /* clear current supported versions. */
1822 nfsd_vers(nn, 2, NFSD_CLEAR);
1823 nfsd_vers(nn, 3, NFSD_CLEAR);
1824 for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++)
1825 nfsd_minorversion(nn, i, NFSD_CLEAR);
1826
1827 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
1828 struct nlattr *tb[NFSD_A_VERSION_MAX + 1];
1829 u32 major, minor = 0;
1830 bool enabled;
1831
1832 if (nla_type(attr) != NFSD_A_SERVER_PROTO_VERSION)
1833 continue;
1834
1835 if (nla_parse_nested(tb, NFSD_A_VERSION_MAX, attr,
1836 nfsd_version_nl_policy, info->extack) < 0)
1837 continue;
1838
1839 if (!tb[NFSD_A_VERSION_MAJOR])
1840 continue;
1841
1842 major = nla_get_u32(tb[NFSD_A_VERSION_MAJOR]);
1843 if (tb[NFSD_A_VERSION_MINOR])
1844 minor = nla_get_u32(tb[NFSD_A_VERSION_MINOR]);
1845
1846 enabled = nla_get_flag(tb[NFSD_A_VERSION_ENABLED]);
1847
1848 switch (major) {
1849 case 4:
1850 nfsd_minorversion(nn, minor, enabled ? NFSD_SET : NFSD_CLEAR);
1851 break;
1852 case 3:
1853 case 2:
1854 if (!minor)
1855 nfsd_vers(nn, major, enabled ? NFSD_SET : NFSD_CLEAR);
1856 break;
1857 default:
1858 break;
1859 }
1860 }
1861
1862 mutex_unlock(&nfsd_mutex);
1863
1864 return 0;
1865}
1866
1867/**
1868 * nfsd_nl_version_get_doit - get the enabled status for all supported nfs versions
1869 * @skb: reply buffer
1870 * @info: netlink metadata and command arguments
1871 *
1872 * Return 0 on success or a negative errno.
1873 */
1874int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info)
1875{
1876 struct nfsd_net *nn;
1877 int i, err;
1878 void *hdr;
1879
1880 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
1881 if (!skb)
1882 return -ENOMEM;
1883
1884 hdr = genlmsg_iput(skb, info);
1885 if (!hdr) {
1886 err = -EMSGSIZE;
1887 goto err_free_msg;
1888 }
1889
1890 mutex_lock(&nfsd_mutex);
1891 nn = net_generic(genl_info_net(info), nfsd_net_id);
1892
1893 for (i = 2; i <= 4; i++) {
1894 int j;
1895
1896 for (j = 0; j <= NFSD_SUPPORTED_MINOR_VERSION; j++) {
1897 struct nlattr *attr;
1898
1899 /* Don't record any versions the kernel doesn't have
1900 * compiled in
1901 */
1902 if (!nfsd_support_version(i))
1903 continue;
1904
1905 /* NFSv{2,3} does not support minor numbers */
1906 if (i < 4 && j)
1907 continue;
1908
1909 attr = nla_nest_start(skb,
1910 NFSD_A_SERVER_PROTO_VERSION);
1911 if (!attr) {
1912 err = -EINVAL;
1913 goto err_nfsd_unlock;
1914 }
1915
1916 if (nla_put_u32(skb, NFSD_A_VERSION_MAJOR, i) ||
1917 nla_put_u32(skb, NFSD_A_VERSION_MINOR, j)) {
1918 err = -EINVAL;
1919 goto err_nfsd_unlock;
1920 }
1921
1922 /* Set the enabled flag if the version is enabled */
1923 if (nfsd_vers(nn, i, NFSD_TEST) &&
1924 (i < 4 || nfsd_minorversion(nn, j, NFSD_TEST)) &&
1925 nla_put_flag(skb, NFSD_A_VERSION_ENABLED)) {
1926 err = -EINVAL;
1927 goto err_nfsd_unlock;
1928 }
1929
1930 nla_nest_end(skb, attr);
1931 }
1932 }
1933
1934 mutex_unlock(&nfsd_mutex);
1935 genlmsg_end(skb, hdr);
1936
1937 return genlmsg_reply(skb, info);
1938
1939err_nfsd_unlock:
1940 mutex_unlock(&nfsd_mutex);
1941err_free_msg:
1942 nlmsg_free(skb);
1943
1944 return err;
1945}
1946
1947/**
1948 * nfsd_nl_listener_set_doit - set the nfs running sockets
1949 * @skb: reply buffer
1950 * @info: netlink metadata and command arguments
1951 *
1952 * Return 0 on success or a negative errno.
1953 */
1954int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info)
1955{
1956 struct net *net = genl_info_net(info);
1957 struct svc_xprt *xprt, *tmp;
1958 const struct nlattr *attr;
1959 struct svc_serv *serv;
1960 LIST_HEAD(permsocks);
1961 struct nfsd_net *nn;
1962 int err, rem;
1963
1964 mutex_lock(&nfsd_mutex);
1965
1966 err = nfsd_create_serv(net);
1967 if (err) {
1968 mutex_unlock(&nfsd_mutex);
1969 return err;
1970 }
1971
1972 nn = net_generic(net, nfsd_net_id);
1973 serv = nn->nfsd_serv;
1974
1975 spin_lock_bh(&serv->sv_lock);
1976
1977 /* Move all of the old listener sockets to a temp list */
1978 list_splice_init(&serv->sv_permsocks, &permsocks);
1979
1980 /*
1981 * Walk the list of server_socks from userland and move any that match
1982 * back to sv_permsocks
1983 */
1984 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
1985 struct nlattr *tb[NFSD_A_SOCK_MAX + 1];
1986 const char *xcl_name;
1987 struct sockaddr *sa;
1988
1989 if (nla_type(attr) != NFSD_A_SERVER_SOCK_ADDR)
1990 continue;
1991
1992 if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr,
1993 nfsd_sock_nl_policy, info->extack) < 0)
1994 continue;
1995
1996 if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME])
1997 continue;
1998
1999 if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa))
2000 continue;
2001
2002 xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]);
2003 sa = nla_data(tb[NFSD_A_SOCK_ADDR]);
2004
2005 /* Put back any matching sockets */
2006 list_for_each_entry_safe(xprt, tmp, &permsocks, xpt_list) {
2007 /* This shouldn't be possible */
2008 if (WARN_ON_ONCE(xprt->xpt_net != net)) {
2009 list_move(&xprt->xpt_list, &serv->sv_permsocks);
2010 continue;
2011 }
2012
2013 /* If everything matches, put it back */
2014 if (!strcmp(xprt->xpt_class->xcl_name, xcl_name) &&
2015 rpc_cmp_addr_port(sa, (struct sockaddr *)&xprt->xpt_local)) {
2016 list_move(&xprt->xpt_list, &serv->sv_permsocks);
2017 break;
2018 }
2019 }
2020 }
2021
2022 /* For now, no removing old sockets while server is running */
2023 if (serv->sv_nrthreads && !list_empty(&permsocks)) {
2024 list_splice_init(&permsocks, &serv->sv_permsocks);
2025 spin_unlock_bh(&serv->sv_lock);
2026 err = -EBUSY;
2027 goto out_unlock_mtx;
2028 }
2029
2030 /* Close the remaining sockets on the permsocks list */
2031 while (!list_empty(&permsocks)) {
2032 xprt = list_first_entry(&permsocks, struct svc_xprt, xpt_list);
2033 list_move(&xprt->xpt_list, &serv->sv_permsocks);
2034
2035 /*
2036 * Newly-created sockets are born with the BUSY bit set. Clear
2037 * it if there are no threads, since nothing can pick it up
2038 * in that case.
2039 */
2040 if (!serv->sv_nrthreads)
2041 clear_bit(XPT_BUSY, &xprt->xpt_flags);
2042
2043 set_bit(XPT_CLOSE, &xprt->xpt_flags);
2044 spin_unlock_bh(&serv->sv_lock);
2045 svc_xprt_close(xprt);
2046 spin_lock_bh(&serv->sv_lock);
2047 }
2048
2049 spin_unlock_bh(&serv->sv_lock);
2050
2051 /* walk list of addrs again, open any that still don't exist */
2052 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
2053 struct nlattr *tb[NFSD_A_SOCK_MAX + 1];
2054 const char *xcl_name;
2055 struct sockaddr *sa;
2056 int ret;
2057
2058 if (nla_type(attr) != NFSD_A_SERVER_SOCK_ADDR)
2059 continue;
2060
2061 if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr,
2062 nfsd_sock_nl_policy, info->extack) < 0)
2063 continue;
2064
2065 if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME])
2066 continue;
2067
2068 if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa))
2069 continue;
2070
2071 xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]);
2072 sa = nla_data(tb[NFSD_A_SOCK_ADDR]);
2073
2074 xprt = svc_find_listener(serv, xcl_name, net, sa);
2075 if (xprt) {
2076 svc_xprt_put(xprt);
2077 continue;
2078 }
2079
2080 ret = svc_xprt_create_from_sa(serv, xcl_name, net, sa, 0,
2081 get_current_cred());
2082 /* always save the latest error */
2083 if (ret < 0)
2084 err = ret;
2085 }
2086
2087 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
2088 nfsd_destroy_serv(net);
2089
2090out_unlock_mtx:
2091 mutex_unlock(&nfsd_mutex);
2092
2093 return err;
2094}
2095
2096/**
2097 * nfsd_nl_listener_get_doit - get the nfs running listeners
2098 * @skb: reply buffer
2099 * @info: netlink metadata and command arguments
2100 *
2101 * Return 0 on success or a negative errno.
2102 */
2103int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info)
2104{
2105 struct svc_xprt *xprt;
2106 struct svc_serv *serv;
2107 struct nfsd_net *nn;
2108 void *hdr;
2109 int err;
2110
2111 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
2112 if (!skb)
2113 return -ENOMEM;
2114
2115 hdr = genlmsg_iput(skb, info);
2116 if (!hdr) {
2117 err = -EMSGSIZE;
2118 goto err_free_msg;
2119 }
2120
2121 mutex_lock(&nfsd_mutex);
2122 nn = net_generic(genl_info_net(info), nfsd_net_id);
2123
2124 /* no nfs server? Just send empty socket list */
2125 if (!nn->nfsd_serv)
2126 goto out_unlock_mtx;
2127
2128 serv = nn->nfsd_serv;
2129 spin_lock_bh(&serv->sv_lock);
2130 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
2131 struct nlattr *attr;
2132
2133 attr = nla_nest_start(skb, NFSD_A_SERVER_SOCK_ADDR);
2134 if (!attr) {
2135 err = -EINVAL;
2136 goto err_serv_unlock;
2137 }
2138
2139 if (nla_put_string(skb, NFSD_A_SOCK_TRANSPORT_NAME,
2140 xprt->xpt_class->xcl_name) ||
2141 nla_put(skb, NFSD_A_SOCK_ADDR,
2142 sizeof(struct sockaddr_storage),
2143 &xprt->xpt_local)) {
2144 err = -EINVAL;
2145 goto err_serv_unlock;
2146 }
2147
2148 nla_nest_end(skb, attr);
2149 }
2150 spin_unlock_bh(&serv->sv_lock);
2151out_unlock_mtx:
2152 mutex_unlock(&nfsd_mutex);
2153 genlmsg_end(skb, hdr);
2154
2155 return genlmsg_reply(skb, info);
2156
2157err_serv_unlock:
2158 spin_unlock_bh(&serv->sv_lock);
2159 mutex_unlock(&nfsd_mutex);
2160err_free_msg:
2161 nlmsg_free(skb);
2162
2163 return err;
2164}
2165
2166/**
2167 * nfsd_nl_pool_mode_set_doit - set the number of running threads
2168 * @skb: reply buffer
2169 * @info: netlink metadata and command arguments
2170 *
2171 * Return 0 on success or a negative errno.
2172 */
2173int nfsd_nl_pool_mode_set_doit(struct sk_buff *skb, struct genl_info *info)
2174{
2175 const struct nlattr *attr;
2176
2177 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_POOL_MODE_MODE))
2178 return -EINVAL;
2179
2180 attr = info->attrs[NFSD_A_POOL_MODE_MODE];
2181 return sunrpc_set_pool_mode(nla_data(attr));
2182}
2183
2184/**
2185 * nfsd_nl_pool_mode_get_doit - get info about pool_mode
2186 * @skb: reply buffer
2187 * @info: netlink metadata and command arguments
2188 *
2189 * Return 0 on success or a negative errno.
2190 */
2191int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info)
2192{
2193 struct net *net = genl_info_net(info);
2194 char buf[16];
2195 void *hdr;
2196 int err;
2197
2198 if (sunrpc_get_pool_mode(buf, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
2199 return -ERANGE;
2200
2201 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
2202 if (!skb)
2203 return -ENOMEM;
2204
2205 err = -EMSGSIZE;
2206 hdr = genlmsg_iput(skb, info);
2207 if (!hdr)
2208 goto err_free_msg;
2209
2210 err = nla_put_string(skb, NFSD_A_POOL_MODE_MODE, buf) |
2211 nla_put_u32(skb, NFSD_A_POOL_MODE_NPOOLS, nfsd_nrpools(net));
2212 if (err)
2213 goto err_free_msg;
2214
2215 genlmsg_end(skb, hdr);
2216 return genlmsg_reply(skb, info);
2217
2218err_free_msg:
2219 nlmsg_free(skb);
2220 return err;
2221}
2222
2223/**
2224 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
2225 * @net: a freshly-created network namespace
2226 *
2227 * This information stays around as long as the network namespace is
2228 * alive whether or not there is an NFSD instance running in the
2229 * namespace.
2230 *
2231 * Returns zero on success, or a negative errno otherwise.
2232 */
2233static __net_init int nfsd_net_init(struct net *net)
2234{
2235 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2236 int retval;
2237 int i;
2238
2239 retval = nfsd_export_init(net);
2240 if (retval)
2241 goto out_export_error;
2242 retval = nfsd_idmap_init(net);
2243 if (retval)
2244 goto out_idmap_error;
2245 retval = percpu_counter_init_many(nn->counter, 0, GFP_KERNEL,
2246 NFSD_STATS_COUNTERS_NUM);
2247 if (retval)
2248 goto out_repcache_error;
2249 memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats));
2250 nn->nfsd_svcstats.program = &nfsd_programs[0];
2251 for (i = 0; i < sizeof(nn->nfsd_versions); i++)
2252 nn->nfsd_versions[i] = nfsd_support_version(i);
2253 for (i = 0; i < sizeof(nn->nfsd4_minorversions); i++)
2254 nn->nfsd4_minorversions[i] = nfsd_support_version(4);
2255 nn->nfsd_info.mutex = &nfsd_mutex;
2256 nn->nfsd_serv = NULL;
2257 nfsd4_init_leases_net(nn);
2258 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
2259 seqlock_init(&nn->writeverf_lock);
2260 nfsd_proc_stat_init(net);
2261#if IS_ENABLED(CONFIG_NFS_LOCALIO)
2262 INIT_LIST_HEAD(&nn->local_clients);
2263#endif
2264 return 0;
2265
2266out_repcache_error:
2267 nfsd_idmap_shutdown(net);
2268out_idmap_error:
2269 nfsd_export_shutdown(net);
2270out_export_error:
2271 return retval;
2272}
2273
2274#if IS_ENABLED(CONFIG_NFS_LOCALIO)
2275/**
2276 * nfsd_net_pre_exit - Disconnect localio clients from net namespace
2277 * @net: a network namespace that is about to be destroyed
2278 *
2279 * This invalidated ->net pointers held by localio clients
2280 * while they can still safely access nn->counter.
2281 */
2282static __net_exit void nfsd_net_pre_exit(struct net *net)
2283{
2284 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2285
2286 nfs_uuid_invalidate_clients(&nn->local_clients);
2287}
2288#endif
2289
2290/**
2291 * nfsd_net_exit - Release the nfsd_net portion of a net namespace
2292 * @net: a network namespace that is about to be destroyed
2293 *
2294 */
2295static __net_exit void nfsd_net_exit(struct net *net)
2296{
2297 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2298
2299 nfsd_proc_stat_shutdown(net);
2300 percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM);
2301 nfsd_idmap_shutdown(net);
2302 nfsd_export_shutdown(net);
2303}
2304
2305static struct pernet_operations nfsd_net_ops = {
2306 .init = nfsd_net_init,
2307#if IS_ENABLED(CONFIG_NFS_LOCALIO)
2308 .pre_exit = nfsd_net_pre_exit,
2309#endif
2310 .exit = nfsd_net_exit,
2311 .id = &nfsd_net_id,
2312 .size = sizeof(struct nfsd_net),
2313};
2314
2315static int __init init_nfsd(void)
2316{
2317 int retval;
2318
2319 retval = nfsd4_init_slabs();
2320 if (retval)
2321 return retval;
2322 retval = nfsd4_init_pnfs();
2323 if (retval)
2324 goto out_free_slabs;
2325 retval = nfsd_drc_slab_create();
2326 if (retval)
2327 goto out_free_pnfs;
2328 nfsd_lockd_init(); /* lockd->nfsd callbacks */
2329 retval = create_proc_exports_entry();
2330 if (retval)
2331 goto out_free_lockd;
2332 retval = register_pernet_subsys(&nfsd_net_ops);
2333 if (retval < 0)
2334 goto out_free_exports;
2335 retval = register_cld_notifier();
2336 if (retval)
2337 goto out_free_subsys;
2338 retval = nfsd4_create_laundry_wq();
2339 if (retval)
2340 goto out_free_cld;
2341 retval = register_filesystem(&nfsd_fs_type);
2342 if (retval)
2343 goto out_free_all;
2344 retval = genl_register_family(&nfsd_nl_family);
2345 if (retval)
2346 goto out_free_all;
2347 nfsd_localio_ops_init();
2348
2349 return 0;
2350out_free_all:
2351 nfsd4_destroy_laundry_wq();
2352out_free_cld:
2353 unregister_cld_notifier();
2354out_free_subsys:
2355 unregister_pernet_subsys(&nfsd_net_ops);
2356out_free_exports:
2357 remove_proc_entry("fs/nfs/exports", NULL);
2358 remove_proc_entry("fs/nfs", NULL);
2359out_free_lockd:
2360 nfsd_lockd_shutdown();
2361 nfsd_drc_slab_free();
2362out_free_pnfs:
2363 nfsd4_exit_pnfs();
2364out_free_slabs:
2365 nfsd4_free_slabs();
2366 return retval;
2367}
2368
2369static void __exit exit_nfsd(void)
2370{
2371 genl_unregister_family(&nfsd_nl_family);
2372 unregister_filesystem(&nfsd_fs_type);
2373 nfsd4_destroy_laundry_wq();
2374 unregister_cld_notifier();
2375 unregister_pernet_subsys(&nfsd_net_ops);
2376 nfsd_drc_slab_free();
2377 remove_proc_entry("fs/nfs/exports", NULL);
2378 remove_proc_entry("fs/nfs", NULL);
2379 nfsd_lockd_shutdown();
2380 nfsd4_free_slabs();
2381 nfsd4_exit_pnfs();
2382}
2383
2384MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2385MODULE_DESCRIPTION("In-kernel NFS server");
2386MODULE_LICENSE("GPL");
2387module_init(init_nfsd)
2388module_exit(exit_nfsd)