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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/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)
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/module.h>
19#include <linux/fsnotify.h>
20
21#include "idmap.h"
22#include "nfsd.h"
23#include "cache.h"
24#include "state.h"
25#include "netns.h"
26#include "pnfs.h"
27#include "filecache.h"
28#include "trace.h"
29#include "netlink.h"
30
31/*
32 * We have a single directory with several nodes in it.
33 */
34enum {
35 NFSD_Root = 1,
36 NFSD_List,
37 NFSD_Export_Stats,
38 NFSD_Export_features,
39 NFSD_Fh,
40 NFSD_FO_UnlockIP,
41 NFSD_FO_UnlockFS,
42 NFSD_Threads,
43 NFSD_Pool_Threads,
44 NFSD_Pool_Stats,
45 NFSD_Reply_Cache_Stats,
46 NFSD_Versions,
47 NFSD_Ports,
48 NFSD_MaxBlkSize,
49 NFSD_MaxConnections,
50 NFSD_Filecache,
51 NFSD_Leasetime,
52 NFSD_Gracetime,
53 NFSD_RecoveryDir,
54 NFSD_V4EndGrace,
55 NFSD_MaxReserved
56};
57
58/*
59 * write() for these nodes.
60 */
61static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
62static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
63static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
64static ssize_t write_threads(struct file *file, char *buf, size_t size);
65static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
66static ssize_t write_versions(struct file *file, char *buf, size_t size);
67static ssize_t write_ports(struct file *file, char *buf, size_t size);
68static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
69static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
70#ifdef CONFIG_NFSD_V4
71static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
72static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
73#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
74static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
75#endif
76static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
77#endif
78
79static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
80 [NFSD_Fh] = write_filehandle,
81 [NFSD_FO_UnlockIP] = write_unlock_ip,
82 [NFSD_FO_UnlockFS] = write_unlock_fs,
83 [NFSD_Threads] = write_threads,
84 [NFSD_Pool_Threads] = write_pool_threads,
85 [NFSD_Versions] = write_versions,
86 [NFSD_Ports] = write_ports,
87 [NFSD_MaxBlkSize] = write_maxblksize,
88 [NFSD_MaxConnections] = write_maxconn,
89#ifdef CONFIG_NFSD_V4
90 [NFSD_Leasetime] = write_leasetime,
91 [NFSD_Gracetime] = write_gracetime,
92#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
93 [NFSD_RecoveryDir] = write_recoverydir,
94#endif
95 [NFSD_V4EndGrace] = write_v4_end_grace,
96#endif
97};
98
99static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
100{
101 ino_t ino = file_inode(file)->i_ino;
102 char *data;
103 ssize_t rv;
104
105 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
106 return -EINVAL;
107
108 data = simple_transaction_get(file, buf, size);
109 if (IS_ERR(data))
110 return PTR_ERR(data);
111
112 rv = write_op[ino](file, data, size);
113 if (rv < 0)
114 return rv;
115
116 simple_transaction_set(file, rv);
117 return size;
118}
119
120static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
121{
122 if (! file->private_data) {
123 /* An attempt to read a transaction file without writing
124 * causes a 0-byte write so that the file can return
125 * state information
126 */
127 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
128 if (rv < 0)
129 return rv;
130 }
131 return simple_transaction_read(file, buf, size, pos);
132}
133
134static const struct file_operations transaction_ops = {
135 .write = nfsctl_transaction_write,
136 .read = nfsctl_transaction_read,
137 .release = simple_transaction_release,
138 .llseek = default_llseek,
139};
140
141static int exports_net_open(struct net *net, struct file *file)
142{
143 int err;
144 struct seq_file *seq;
145 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
146
147 err = seq_open(file, &nfs_exports_op);
148 if (err)
149 return err;
150
151 seq = file->private_data;
152 seq->private = nn->svc_export_cache;
153 return 0;
154}
155
156static int exports_nfsd_open(struct inode *inode, struct file *file)
157{
158 return exports_net_open(inode->i_sb->s_fs_info, file);
159}
160
161static const struct file_operations exports_nfsd_operations = {
162 .open = exports_nfsd_open,
163 .read = seq_read,
164 .llseek = seq_lseek,
165 .release = seq_release,
166};
167
168static int export_features_show(struct seq_file *m, void *v)
169{
170 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
171 return 0;
172}
173
174DEFINE_SHOW_ATTRIBUTE(export_features);
175
176static const struct file_operations pool_stats_operations = {
177 .open = nfsd_pool_stats_open,
178 .read = seq_read,
179 .llseek = seq_lseek,
180 .release = seq_release,
181};
182
183DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
184
185DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
186
187/*----------------------------------------------------------------------------*/
188/*
189 * payload - write methods
190 */
191
192static inline struct net *netns(struct file *file)
193{
194 return file_inode(file)->i_sb->s_fs_info;
195}
196
197/*
198 * write_unlock_ip - Release all locks used by a client
199 *
200 * Experimental.
201 *
202 * Input:
203 * buf: '\n'-terminated C string containing a
204 * presentation format IP address
205 * size: length of C string in @buf
206 * Output:
207 * On success: returns zero if all specified locks were released;
208 * returns one if one or more locks were not released
209 * On error: return code is negative errno value
210 */
211static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
212{
213 struct sockaddr_storage address;
214 struct sockaddr *sap = (struct sockaddr *)&address;
215 size_t salen = sizeof(address);
216 char *fo_path;
217 struct net *net = netns(file);
218
219 /* sanity check */
220 if (size == 0)
221 return -EINVAL;
222
223 if (buf[size-1] != '\n')
224 return -EINVAL;
225
226 fo_path = buf;
227 if (qword_get(&buf, fo_path, size) < 0)
228 return -EINVAL;
229
230 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
231 return -EINVAL;
232
233 trace_nfsd_ctl_unlock_ip(net, buf);
234 return nlmsvc_unlock_all_by_ip(sap);
235}
236
237/*
238 * write_unlock_fs - Release all locks on a local file system
239 *
240 * Experimental.
241 *
242 * Input:
243 * buf: '\n'-terminated C string containing the
244 * absolute pathname of a local file system
245 * size: length of C string in @buf
246 * Output:
247 * On success: returns zero if all specified locks were released;
248 * returns one if one or more locks were not released
249 * On error: return code is negative errno value
250 */
251static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
252{
253 struct path path;
254 char *fo_path;
255 int error;
256
257 /* sanity check */
258 if (size == 0)
259 return -EINVAL;
260
261 if (buf[size-1] != '\n')
262 return -EINVAL;
263
264 fo_path = buf;
265 if (qword_get(&buf, fo_path, size) < 0)
266 return -EINVAL;
267 trace_nfsd_ctl_unlock_fs(netns(file), fo_path);
268 error = kern_path(fo_path, 0, &path);
269 if (error)
270 return error;
271
272 /*
273 * XXX: Needs better sanity checking. Otherwise we could end up
274 * releasing locks on the wrong file system.
275 *
276 * For example:
277 * 1. Does the path refer to a directory?
278 * 2. Is that directory a mount point, or
279 * 3. Is that directory the root of an exported file system?
280 */
281 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
282 nfsd4_revoke_states(netns(file), path.dentry->d_sb);
283
284 path_put(&path);
285 return error;
286}
287
288/*
289 * write_filehandle - Get a variable-length NFS file handle by path
290 *
291 * On input, the buffer contains a '\n'-terminated C string comprised of
292 * three alphanumeric words separated by whitespace. The string may
293 * contain escape sequences.
294 *
295 * Input:
296 * buf:
297 * domain: client domain name
298 * path: export pathname
299 * maxsize: numeric maximum size of
300 * @buf
301 * size: length of C string in @buf
302 * Output:
303 * On success: passed-in buffer filled with '\n'-terminated C
304 * string containing a ASCII hex text version
305 * of the NFS file handle;
306 * return code is the size in bytes of the string
307 * On error: return code is negative errno value
308 */
309static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
310{
311 char *dname, *path;
312 int maxsize;
313 char *mesg = buf;
314 int len;
315 struct auth_domain *dom;
316 struct knfsd_fh fh;
317
318 if (size == 0)
319 return -EINVAL;
320
321 if (buf[size-1] != '\n')
322 return -EINVAL;
323 buf[size-1] = 0;
324
325 dname = mesg;
326 len = qword_get(&mesg, dname, size);
327 if (len <= 0)
328 return -EINVAL;
329
330 path = dname+len+1;
331 len = qword_get(&mesg, path, size);
332 if (len <= 0)
333 return -EINVAL;
334
335 len = get_int(&mesg, &maxsize);
336 if (len)
337 return len;
338
339 if (maxsize < NFS_FHSIZE)
340 return -EINVAL;
341 maxsize = min(maxsize, NFS3_FHSIZE);
342
343 if (qword_get(&mesg, mesg, size) > 0)
344 return -EINVAL;
345
346 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize);
347
348 /* we have all the words, they are in buf.. */
349 dom = unix_domain_find(dname);
350 if (!dom)
351 return -ENOMEM;
352
353 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
354 auth_domain_put(dom);
355 if (len)
356 return len;
357
358 mesg = buf;
359 len = SIMPLE_TRANSACTION_LIMIT;
360 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
361 mesg[-1] = '\n';
362 return mesg - buf;
363}
364
365/*
366 * write_threads - Start NFSD, or report the current number of running threads
367 *
368 * Input:
369 * buf: ignored
370 * size: zero
371 * Output:
372 * On success: passed-in buffer filled with '\n'-terminated C
373 * string numeric value representing the number of
374 * running NFSD threads;
375 * return code is the size in bytes of the string
376 * On error: return code is zero
377 *
378 * OR
379 *
380 * Input:
381 * buf: C string containing an unsigned
382 * integer value representing the
383 * number of NFSD threads to start
384 * size: non-zero length of C string in @buf
385 * Output:
386 * On success: NFS service is started;
387 * passed-in buffer filled with '\n'-terminated C
388 * string numeric value representing the number of
389 * running NFSD threads;
390 * return code is the size in bytes of the string
391 * On error: return code is zero or a negative errno value
392 */
393static ssize_t write_threads(struct file *file, char *buf, size_t size)
394{
395 char *mesg = buf;
396 int rv;
397 struct net *net = netns(file);
398
399 if (size > 0) {
400 int newthreads;
401 rv = get_int(&mesg, &newthreads);
402 if (rv)
403 return rv;
404 if (newthreads < 0)
405 return -EINVAL;
406 trace_nfsd_ctl_threads(net, newthreads);
407 rv = nfsd_svc(newthreads, net, file->f_cred);
408 if (rv < 0)
409 return rv;
410 } else
411 rv = nfsd_nrthreads(net);
412
413 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
414}
415
416/*
417 * write_pool_threads - Set or report the current number of threads per pool
418 *
419 * Input:
420 * buf: ignored
421 * size: zero
422 *
423 * OR
424 *
425 * Input:
426 * buf: C string containing whitespace-
427 * separated unsigned integer values
428 * representing the number of NFSD
429 * threads to start in each pool
430 * size: non-zero length of C string in @buf
431 * Output:
432 * On success: passed-in buffer filled with '\n'-terminated C
433 * string containing integer values representing the
434 * number of NFSD threads in each pool;
435 * return code is the size in bytes of the string
436 * On error: return code is zero or a negative errno value
437 */
438static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
439{
440 /* if size > 0, look for an array of number of threads per node
441 * and apply them then write out number of threads per node as reply
442 */
443 char *mesg = buf;
444 int i;
445 int rv;
446 int len;
447 int npools;
448 int *nthreads;
449 struct net *net = netns(file);
450
451 mutex_lock(&nfsd_mutex);
452 npools = nfsd_nrpools(net);
453 if (npools == 0) {
454 /*
455 * NFS is shut down. The admin can start it by
456 * writing to the threads file but NOT the pool_threads
457 * file, sorry. Report zero threads.
458 */
459 mutex_unlock(&nfsd_mutex);
460 strcpy(buf, "0\n");
461 return strlen(buf);
462 }
463
464 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
465 rv = -ENOMEM;
466 if (nthreads == NULL)
467 goto out_free;
468
469 if (size > 0) {
470 for (i = 0; i < npools; i++) {
471 rv = get_int(&mesg, &nthreads[i]);
472 if (rv == -ENOENT)
473 break; /* fewer numbers than pools */
474 if (rv)
475 goto out_free; /* syntax error */
476 rv = -EINVAL;
477 if (nthreads[i] < 0)
478 goto out_free;
479 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]);
480 }
481 rv = nfsd_set_nrthreads(i, nthreads, net);
482 if (rv)
483 goto out_free;
484 }
485
486 rv = nfsd_get_nrthreads(npools, nthreads, net);
487 if (rv)
488 goto out_free;
489
490 mesg = buf;
491 size = SIMPLE_TRANSACTION_LIMIT;
492 for (i = 0; i < npools && size > 0; i++) {
493 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
494 len = strlen(mesg);
495 size -= len;
496 mesg += len;
497 }
498 rv = mesg - buf;
499out_free:
500 kfree(nthreads);
501 mutex_unlock(&nfsd_mutex);
502 return rv;
503}
504
505static ssize_t
506nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
507 const char *sep, unsigned vers, int minor)
508{
509 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
510 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
511
512 if (vers == 4 && minor >= 0 &&
513 !nfsd_minorversion(nn, minor, NFSD_TEST))
514 supported = false;
515 if (minor == 0 && supported)
516 /*
517 * special case for backward compatability.
518 * +4.0 is never reported, it is implied by
519 * +4, unless -4.0 is present.
520 */
521 return 0;
522 return snprintf(buf, remaining, format, sep,
523 supported ? '+' : '-', vers, minor);
524}
525
526static ssize_t __write_versions(struct file *file, char *buf, size_t size)
527{
528 char *mesg = buf;
529 char *vers, *minorp, sign;
530 int len, num, remaining;
531 ssize_t tlen = 0;
532 char *sep;
533 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
534
535 if (size > 0) {
536 if (nn->nfsd_serv)
537 /* Cannot change versions without updating
538 * nn->nfsd_serv->sv_xdrsize, and reallocing
539 * rq_argp and rq_resp
540 */
541 return -EBUSY;
542 if (buf[size-1] != '\n')
543 return -EINVAL;
544 buf[size-1] = 0;
545 trace_nfsd_ctl_version(netns(file), buf);
546
547 vers = mesg;
548 len = qword_get(&mesg, vers, size);
549 if (len <= 0) return -EINVAL;
550 do {
551 enum vers_op cmd;
552 unsigned minor;
553 sign = *vers;
554 if (sign == '+' || sign == '-')
555 num = simple_strtol((vers+1), &minorp, 0);
556 else
557 num = simple_strtol(vers, &minorp, 0);
558 if (*minorp == '.') {
559 if (num != 4)
560 return -EINVAL;
561 if (kstrtouint(minorp+1, 0, &minor) < 0)
562 return -EINVAL;
563 }
564
565 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
566 switch(num) {
567#ifdef CONFIG_NFSD_V2
568 case 2:
569#endif
570 case 3:
571 nfsd_vers(nn, num, cmd);
572 break;
573 case 4:
574 if (*minorp == '.') {
575 if (nfsd_minorversion(nn, minor, cmd) < 0)
576 return -EINVAL;
577 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
578 /*
579 * Either we have +4 and no minors are enabled,
580 * or we have -4 and at least one minor is enabled.
581 * In either case, propagate 'cmd' to all minors.
582 */
583 minor = 0;
584 while (nfsd_minorversion(nn, minor, cmd) >= 0)
585 minor++;
586 }
587 break;
588 default:
589 /* Ignore requests to disable non-existent versions */
590 if (cmd == NFSD_SET)
591 return -EINVAL;
592 }
593 vers += len + 1;
594 } while ((len = qword_get(&mesg, vers, size)) > 0);
595 /* If all get turned off, turn them back on, as
596 * having no versions is BAD
597 */
598 nfsd_reset_versions(nn);
599 }
600
601 /* Now write current state into reply buffer */
602 sep = "";
603 remaining = SIMPLE_TRANSACTION_LIMIT;
604 for (num=2 ; num <= 4 ; num++) {
605 int minor;
606 if (!nfsd_vers(nn, num, NFSD_AVAIL))
607 continue;
608
609 minor = -1;
610 do {
611 len = nfsd_print_version_support(nn, buf, remaining,
612 sep, num, minor);
613 if (len >= remaining)
614 goto out;
615 remaining -= len;
616 buf += len;
617 tlen += len;
618 minor++;
619 if (len)
620 sep = " ";
621 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
622 }
623out:
624 len = snprintf(buf, remaining, "\n");
625 if (len >= remaining)
626 return -EINVAL;
627 return tlen + len;
628}
629
630/*
631 * write_versions - Set or report the available NFS protocol versions
632 *
633 * Input:
634 * buf: ignored
635 * size: zero
636 * Output:
637 * On success: passed-in buffer filled with '\n'-terminated C
638 * string containing positive or negative integer
639 * values representing the current status of each
640 * protocol version;
641 * return code is the size in bytes of the string
642 * On error: return code is zero or a negative errno value
643 *
644 * OR
645 *
646 * Input:
647 * buf: C string containing whitespace-
648 * separated positive or negative
649 * integer values representing NFS
650 * protocol versions to enable ("+n")
651 * or disable ("-n")
652 * size: non-zero length of C string in @buf
653 * Output:
654 * On success: status of zero or more protocol versions has
655 * been updated; passed-in buffer filled with
656 * '\n'-terminated C string containing positive
657 * or negative integer values representing the
658 * current status of each protocol version;
659 * return code is the size in bytes of the string
660 * On error: return code is zero or a negative errno value
661 */
662static ssize_t write_versions(struct file *file, char *buf, size_t size)
663{
664 ssize_t rv;
665
666 mutex_lock(&nfsd_mutex);
667 rv = __write_versions(file, buf, size);
668 mutex_unlock(&nfsd_mutex);
669 return rv;
670}
671
672/*
673 * Zero-length write. Return a list of NFSD's current listener
674 * transports.
675 */
676static ssize_t __write_ports_names(char *buf, struct net *net)
677{
678 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
679
680 if (nn->nfsd_serv == NULL)
681 return 0;
682 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
683}
684
685/*
686 * A single 'fd' number was written, in which case it must be for
687 * a socket of a supported family/protocol, and we use it as an
688 * nfsd listener.
689 */
690static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
691{
692 char *mesg = buf;
693 int fd, err;
694 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
695 struct svc_serv *serv;
696
697 err = get_int(&mesg, &fd);
698 if (err != 0 || fd < 0)
699 return -EINVAL;
700 trace_nfsd_ctl_ports_addfd(net, fd);
701
702 err = nfsd_create_serv(net);
703 if (err != 0)
704 return err;
705
706 serv = nn->nfsd_serv;
707 err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
708
709 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
710 nfsd_destroy_serv(net);
711
712 return err;
713}
714
715/*
716 * A transport listener is added by writing its transport name and
717 * a port number.
718 */
719static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
720{
721 char transport[16];
722 struct svc_xprt *xprt;
723 int port, err;
724 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
725 struct svc_serv *serv;
726
727 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
728 return -EINVAL;
729
730 if (port < 1 || port > USHRT_MAX)
731 return -EINVAL;
732 trace_nfsd_ctl_ports_addxprt(net, transport, port);
733
734 err = nfsd_create_serv(net);
735 if (err != 0)
736 return err;
737
738 serv = nn->nfsd_serv;
739 err = svc_xprt_create(serv, transport, net,
740 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
741 if (err < 0)
742 goto out_err;
743
744 err = svc_xprt_create(serv, transport, net,
745 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
746 if (err < 0 && err != -EAFNOSUPPORT)
747 goto out_close;
748
749 return 0;
750out_close:
751 xprt = svc_find_xprt(serv, transport, net, PF_INET, port);
752 if (xprt != NULL) {
753 svc_xprt_close(xprt);
754 svc_xprt_put(xprt);
755 }
756out_err:
757 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
758 nfsd_destroy_serv(net);
759
760 return err;
761}
762
763static ssize_t __write_ports(struct file *file, char *buf, size_t size,
764 struct net *net)
765{
766 if (size == 0)
767 return __write_ports_names(buf, net);
768
769 if (isdigit(buf[0]))
770 return __write_ports_addfd(buf, net, file->f_cred);
771
772 if (isalpha(buf[0]))
773 return __write_ports_addxprt(buf, net, file->f_cred);
774
775 return -EINVAL;
776}
777
778/*
779 * write_ports - Pass a socket file descriptor or transport name to listen on
780 *
781 * Input:
782 * buf: ignored
783 * size: zero
784 * Output:
785 * On success: passed-in buffer filled with a '\n'-terminated C
786 * string containing a whitespace-separated list of
787 * named NFSD listeners;
788 * return code is the size in bytes of the string
789 * On error: return code is zero or a negative errno value
790 *
791 * OR
792 *
793 * Input:
794 * buf: C string containing an unsigned
795 * integer value representing a bound
796 * but unconnected socket that is to be
797 * used as an NFSD listener; listen(3)
798 * must be called for a SOCK_STREAM
799 * socket, otherwise it is ignored
800 * size: non-zero length of C string in @buf
801 * Output:
802 * On success: NFS service is started;
803 * passed-in buffer filled with a '\n'-terminated C
804 * string containing a unique alphanumeric name of
805 * the listener;
806 * return code is the size in bytes of the string
807 * On error: return code is a negative errno value
808 *
809 * OR
810 *
811 * Input:
812 * buf: C string containing a transport
813 * name and an unsigned integer value
814 * representing the port to listen on,
815 * separated by whitespace
816 * size: non-zero length of C string in @buf
817 * Output:
818 * On success: returns zero; NFS service is started
819 * On error: return code is a negative errno value
820 */
821static ssize_t write_ports(struct file *file, char *buf, size_t size)
822{
823 ssize_t rv;
824
825 mutex_lock(&nfsd_mutex);
826 rv = __write_ports(file, buf, size, netns(file));
827 mutex_unlock(&nfsd_mutex);
828 return rv;
829}
830
831
832int nfsd_max_blksize;
833
834/*
835 * write_maxblksize - Set or report the current NFS blksize
836 *
837 * Input:
838 * buf: ignored
839 * size: zero
840 *
841 * OR
842 *
843 * Input:
844 * buf: C string containing an unsigned
845 * integer value representing the new
846 * NFS blksize
847 * size: non-zero length of C string in @buf
848 * Output:
849 * On success: passed-in buffer filled with '\n'-terminated C string
850 * containing numeric value of the current NFS blksize
851 * setting;
852 * return code is the size in bytes of the string
853 * On error: return code is zero or a negative errno value
854 */
855static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
856{
857 char *mesg = buf;
858 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
859
860 if (size > 0) {
861 int bsize;
862 int rv = get_int(&mesg, &bsize);
863 if (rv)
864 return rv;
865 trace_nfsd_ctl_maxblksize(netns(file), bsize);
866
867 /* force bsize into allowed range and
868 * required alignment.
869 */
870 bsize = max_t(int, bsize, 1024);
871 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
872 bsize &= ~(1024-1);
873 mutex_lock(&nfsd_mutex);
874 if (nn->nfsd_serv) {
875 mutex_unlock(&nfsd_mutex);
876 return -EBUSY;
877 }
878 nfsd_max_blksize = bsize;
879 mutex_unlock(&nfsd_mutex);
880 }
881
882 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
883 nfsd_max_blksize);
884}
885
886/*
887 * write_maxconn - Set or report the current max number of connections
888 *
889 * Input:
890 * buf: ignored
891 * size: zero
892 * OR
893 *
894 * Input:
895 * buf: C string containing an unsigned
896 * integer value representing the new
897 * number of max connections
898 * size: non-zero length of C string in @buf
899 * Output:
900 * On success: passed-in buffer filled with '\n'-terminated C string
901 * containing numeric value of max_connections setting
902 * for this net namespace;
903 * return code is the size in bytes of the string
904 * On error: return code is zero or a negative errno value
905 */
906static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
907{
908 char *mesg = buf;
909 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
910 unsigned int maxconn = nn->max_connections;
911
912 if (size > 0) {
913 int rv = get_uint(&mesg, &maxconn);
914
915 if (rv)
916 return rv;
917 trace_nfsd_ctl_maxconn(netns(file), maxconn);
918 nn->max_connections = maxconn;
919 }
920
921 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
922}
923
924#ifdef CONFIG_NFSD_V4
925static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
926 time64_t *time, struct nfsd_net *nn)
927{
928 struct dentry *dentry = file_dentry(file);
929 char *mesg = buf;
930 int rv, i;
931
932 if (size > 0) {
933 if (nn->nfsd_serv)
934 return -EBUSY;
935 rv = get_int(&mesg, &i);
936 if (rv)
937 return rv;
938 trace_nfsd_ctl_time(netns(file), dentry->d_name.name,
939 dentry->d_name.len, i);
940
941 /*
942 * Some sanity checking. We don't have a reason for
943 * these particular numbers, but problems with the
944 * extremes are:
945 * - Too short: the briefest network outage may
946 * cause clients to lose all their locks. Also,
947 * the frequent polling may be wasteful.
948 * - Too long: do you really want reboot recovery
949 * to take more than an hour? Or to make other
950 * clients wait an hour before being able to
951 * revoke a dead client's locks?
952 */
953 if (i < 10 || i > 3600)
954 return -EINVAL;
955 *time = i;
956 }
957
958 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
959}
960
961static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
962 time64_t *time, struct nfsd_net *nn)
963{
964 ssize_t rv;
965
966 mutex_lock(&nfsd_mutex);
967 rv = __nfsd4_write_time(file, buf, size, time, nn);
968 mutex_unlock(&nfsd_mutex);
969 return rv;
970}
971
972/*
973 * write_leasetime - Set or report the current NFSv4 lease time
974 *
975 * Input:
976 * buf: ignored
977 * size: zero
978 *
979 * OR
980 *
981 * Input:
982 * buf: C string containing an unsigned
983 * integer value representing the new
984 * NFSv4 lease expiry time
985 * size: non-zero length of C string in @buf
986 * Output:
987 * On success: passed-in buffer filled with '\n'-terminated C
988 * string containing unsigned integer value of the
989 * current lease expiry time;
990 * return code is the size in bytes of the string
991 * On error: return code is zero or a negative errno value
992 */
993static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
994{
995 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
996 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
997}
998
999/*
1000 * write_gracetime - Set or report current NFSv4 grace period time
1001 *
1002 * As above, but sets the time of the NFSv4 grace period.
1003 *
1004 * Note this should never be set to less than the *previous*
1005 * lease-period time, but we don't try to enforce this. (In the common
1006 * case (a new boot), we don't know what the previous lease time was
1007 * anyway.)
1008 */
1009static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1010{
1011 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1012 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1013}
1014
1015#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1016static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1017 struct nfsd_net *nn)
1018{
1019 char *mesg = buf;
1020 char *recdir;
1021 int len, status;
1022
1023 if (size > 0) {
1024 if (nn->nfsd_serv)
1025 return -EBUSY;
1026 if (size > PATH_MAX || buf[size-1] != '\n')
1027 return -EINVAL;
1028 buf[size-1] = 0;
1029
1030 recdir = mesg;
1031 len = qword_get(&mesg, recdir, size);
1032 if (len <= 0)
1033 return -EINVAL;
1034 trace_nfsd_ctl_recoverydir(netns(file), recdir);
1035
1036 status = nfs4_reset_recoverydir(recdir);
1037 if (status)
1038 return status;
1039 }
1040
1041 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1042 nfs4_recoverydir());
1043}
1044
1045/*
1046 * write_recoverydir - Set or report the pathname of the recovery directory
1047 *
1048 * Input:
1049 * buf: ignored
1050 * size: zero
1051 *
1052 * OR
1053 *
1054 * Input:
1055 * buf: C string containing the pathname
1056 * of the directory on a local file
1057 * system containing permanent NFSv4
1058 * recovery data
1059 * size: non-zero length of C string in @buf
1060 * Output:
1061 * On success: passed-in buffer filled with '\n'-terminated C string
1062 * containing the current recovery pathname setting;
1063 * return code is the size in bytes of the string
1064 * On error: return code is zero or a negative errno value
1065 */
1066static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1067{
1068 ssize_t rv;
1069 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1070
1071 mutex_lock(&nfsd_mutex);
1072 rv = __write_recoverydir(file, buf, size, nn);
1073 mutex_unlock(&nfsd_mutex);
1074 return rv;
1075}
1076#endif
1077
1078/*
1079 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1080 *
1081 * Input:
1082 * buf: ignored
1083 * size: zero
1084 * OR
1085 *
1086 * Input:
1087 * buf: any value
1088 * size: non-zero length of C string in @buf
1089 * Output:
1090 * passed-in buffer filled with "Y" or "N" with a newline
1091 * and NULL-terminated C string. This indicates whether
1092 * the grace period has ended in the current net
1093 * namespace. Return code is the size in bytes of the
1094 * string. Writing a string that starts with 'Y', 'y', or
1095 * '1' to the file will end the grace period for nfsd's v4
1096 * lock manager.
1097 */
1098static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1099{
1100 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1101
1102 if (size > 0) {
1103 switch(buf[0]) {
1104 case 'Y':
1105 case 'y':
1106 case '1':
1107 if (!nn->nfsd_serv)
1108 return -EBUSY;
1109 trace_nfsd_end_grace(netns(file));
1110 nfsd4_end_grace(nn);
1111 break;
1112 default:
1113 return -EINVAL;
1114 }
1115 }
1116
1117 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1118 nn->grace_ended ? 'Y' : 'N');
1119}
1120
1121#endif
1122
1123/*----------------------------------------------------------------------------*/
1124/*
1125 * populating the filesystem.
1126 */
1127
1128/* Basically copying rpc_get_inode. */
1129static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1130{
1131 struct inode *inode = new_inode(sb);
1132 if (!inode)
1133 return NULL;
1134 /* Following advice from simple_fill_super documentation: */
1135 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1136 inode->i_mode = mode;
1137 simple_inode_init_ts(inode);
1138 switch (mode & S_IFMT) {
1139 case S_IFDIR:
1140 inode->i_fop = &simple_dir_operations;
1141 inode->i_op = &simple_dir_inode_operations;
1142 inc_nlink(inode);
1143 break;
1144 case S_IFLNK:
1145 inode->i_op = &simple_symlink_inode_operations;
1146 break;
1147 default:
1148 break;
1149 }
1150 return inode;
1151}
1152
1153static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1154{
1155 struct inode *inode;
1156
1157 inode = nfsd_get_inode(dir->i_sb, mode);
1158 if (!inode)
1159 return -ENOMEM;
1160 if (ncl) {
1161 inode->i_private = ncl;
1162 kref_get(&ncl->cl_ref);
1163 }
1164 d_add(dentry, inode);
1165 inc_nlink(dir);
1166 fsnotify_mkdir(dir, dentry);
1167 return 0;
1168}
1169
1170static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1171{
1172 struct inode *dir = parent->d_inode;
1173 struct dentry *dentry;
1174 int ret = -ENOMEM;
1175
1176 inode_lock(dir);
1177 dentry = d_alloc_name(parent, name);
1178 if (!dentry)
1179 goto out_err;
1180 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1181 if (ret)
1182 goto out_err;
1183out:
1184 inode_unlock(dir);
1185 return dentry;
1186out_err:
1187 dput(dentry);
1188 dentry = ERR_PTR(ret);
1189 goto out;
1190}
1191
1192#if IS_ENABLED(CONFIG_SUNRPC_GSS)
1193static int __nfsd_symlink(struct inode *dir, struct dentry *dentry,
1194 umode_t mode, const char *content)
1195{
1196 struct inode *inode;
1197
1198 inode = nfsd_get_inode(dir->i_sb, mode);
1199 if (!inode)
1200 return -ENOMEM;
1201
1202 inode->i_link = (char *)content;
1203 inode->i_size = strlen(content);
1204
1205 d_add(dentry, inode);
1206 inc_nlink(dir);
1207 fsnotify_create(dir, dentry);
1208 return 0;
1209}
1210
1211/*
1212 * @content is assumed to be a NUL-terminated string that lives
1213 * longer than the symlink itself.
1214 */
1215static void _nfsd_symlink(struct dentry *parent, const char *name,
1216 const char *content)
1217{
1218 struct inode *dir = parent->d_inode;
1219 struct dentry *dentry;
1220 int ret;
1221
1222 inode_lock(dir);
1223 dentry = d_alloc_name(parent, name);
1224 if (!dentry)
1225 goto out;
1226 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content);
1227 if (ret)
1228 dput(dentry);
1229out:
1230 inode_unlock(dir);
1231}
1232#else
1233static inline void _nfsd_symlink(struct dentry *parent, const char *name,
1234 const char *content)
1235{
1236}
1237
1238#endif
1239
1240static void clear_ncl(struct dentry *dentry)
1241{
1242 struct inode *inode = d_inode(dentry);
1243 struct nfsdfs_client *ncl = inode->i_private;
1244
1245 spin_lock(&inode->i_lock);
1246 inode->i_private = NULL;
1247 spin_unlock(&inode->i_lock);
1248 kref_put(&ncl->cl_ref, ncl->cl_release);
1249}
1250
1251struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1252{
1253 struct nfsdfs_client *nc;
1254
1255 spin_lock(&inode->i_lock);
1256 nc = inode->i_private;
1257 if (nc)
1258 kref_get(&nc->cl_ref);
1259 spin_unlock(&inode->i_lock);
1260 return nc;
1261}
1262
1263/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1264 * code instead. */
1265static int nfsdfs_create_files(struct dentry *root,
1266 const struct tree_descr *files,
1267 struct nfsdfs_client *ncl,
1268 struct dentry **fdentries)
1269{
1270 struct inode *dir = d_inode(root);
1271 struct inode *inode;
1272 struct dentry *dentry;
1273 int i;
1274
1275 inode_lock(dir);
1276 for (i = 0; files->name && files->name[0]; i++, files++) {
1277 dentry = d_alloc_name(root, files->name);
1278 if (!dentry)
1279 goto out;
1280 inode = nfsd_get_inode(d_inode(root)->i_sb,
1281 S_IFREG | files->mode);
1282 if (!inode) {
1283 dput(dentry);
1284 goto out;
1285 }
1286 kref_get(&ncl->cl_ref);
1287 inode->i_fop = files->ops;
1288 inode->i_private = ncl;
1289 d_add(dentry, inode);
1290 fsnotify_create(dir, dentry);
1291 if (fdentries)
1292 fdentries[i] = dentry;
1293 }
1294 inode_unlock(dir);
1295 return 0;
1296out:
1297 inode_unlock(dir);
1298 return -ENOMEM;
1299}
1300
1301/* on success, returns positive number unique to that client. */
1302struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1303 struct nfsdfs_client *ncl, u32 id,
1304 const struct tree_descr *files,
1305 struct dentry **fdentries)
1306{
1307 struct dentry *dentry;
1308 char name[11];
1309 int ret;
1310
1311 sprintf(name, "%u", id);
1312
1313 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1314 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1315 return NULL;
1316 ret = nfsdfs_create_files(dentry, files, ncl, fdentries);
1317 if (ret) {
1318 nfsd_client_rmdir(dentry);
1319 return NULL;
1320 }
1321 return dentry;
1322}
1323
1324/* Taken from __rpc_rmdir: */
1325void nfsd_client_rmdir(struct dentry *dentry)
1326{
1327 simple_recursive_removal(dentry, clear_ncl);
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#ifdef CONFIG_NFSD_V4
1359 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1360 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1361#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1362 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1363#endif
1364 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1365#endif
1366 /* last one */ {""}
1367 };
1368
1369 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1370 if (ret)
1371 return ret;
1372 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes",
1373 "/proc/net/rpc/gss_krb5_enctypes");
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
1424
1425static int exports_proc_open(struct inode *inode, struct file *file)
1426{
1427 return exports_net_open(current->nsproxy->net_ns, file);
1428}
1429
1430static const struct proc_ops exports_proc_ops = {
1431 .proc_open = exports_proc_open,
1432 .proc_read = seq_read,
1433 .proc_lseek = seq_lseek,
1434 .proc_release = seq_release,
1435};
1436
1437static int create_proc_exports_entry(void)
1438{
1439 struct proc_dir_entry *entry;
1440
1441 entry = proc_mkdir("fs/nfs", NULL);
1442 if (!entry)
1443 return -ENOMEM;
1444 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1445 if (!entry) {
1446 remove_proc_entry("fs/nfs", NULL);
1447 return -ENOMEM;
1448 }
1449 return 0;
1450}
1451#else /* CONFIG_PROC_FS */
1452static int create_proc_exports_entry(void)
1453{
1454 return 0;
1455}
1456#endif
1457
1458unsigned int nfsd_net_id;
1459
1460/**
1461 * nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit
1462 * @cb: netlink metadata and command arguments
1463 *
1464 * Return values:
1465 * %0: The rpc_status_get command may proceed
1466 * %-ENODEV: There is no NFSD running in this namespace
1467 */
1468int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
1469{
1470 struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id);
1471 int ret = -ENODEV;
1472
1473 mutex_lock(&nfsd_mutex);
1474 if (nn->nfsd_serv)
1475 ret = 0;
1476 else
1477 mutex_unlock(&nfsd_mutex);
1478
1479 return ret;
1480}
1481
1482static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
1483 struct netlink_callback *cb,
1484 struct nfsd_genl_rqstp *rqstp)
1485{
1486 void *hdr;
1487 u32 i;
1488
1489 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1490 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET);
1491 if (!hdr)
1492 return -ENOBUFS;
1493
1494 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) ||
1495 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) ||
1496 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) ||
1497 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) ||
1498 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) ||
1499 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME,
1500 ktime_to_us(rqstp->rq_stime),
1501 NFSD_A_RPC_STATUS_PAD))
1502 return -ENOBUFS;
1503
1504 switch (rqstp->rq_saddr.sa_family) {
1505 case AF_INET: {
1506 const struct sockaddr_in *s_in, *d_in;
1507
1508 s_in = (const struct sockaddr_in *)&rqstp->rq_saddr;
1509 d_in = (const struct sockaddr_in *)&rqstp->rq_daddr;
1510 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4,
1511 s_in->sin_addr.s_addr) ||
1512 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4,
1513 d_in->sin_addr.s_addr) ||
1514 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1515 s_in->sin_port) ||
1516 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1517 d_in->sin_port))
1518 return -ENOBUFS;
1519 break;
1520 }
1521 case AF_INET6: {
1522 const struct sockaddr_in6 *s_in, *d_in;
1523
1524 s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr;
1525 d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr;
1526 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6,
1527 &s_in->sin6_addr) ||
1528 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6,
1529 &d_in->sin6_addr) ||
1530 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1531 s_in->sin6_port) ||
1532 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1533 d_in->sin6_port))
1534 return -ENOBUFS;
1535 break;
1536 }
1537 }
1538
1539 for (i = 0; i < rqstp->rq_opcnt; i++)
1540 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS,
1541 rqstp->rq_opnum[i]))
1542 return -ENOBUFS;
1543
1544 genlmsg_end(skb, hdr);
1545 return 0;
1546}
1547
1548/**
1549 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit
1550 * @skb: reply buffer
1551 * @cb: netlink metadata and command arguments
1552 *
1553 * Returns the size of the reply or a negative errno.
1554 */
1555int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
1556 struct netlink_callback *cb)
1557{
1558 struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id);
1559 int i, ret, rqstp_index = 0;
1560
1561 rcu_read_lock();
1562
1563 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
1564 struct svc_rqst *rqstp;
1565
1566 if (i < cb->args[0]) /* already consumed */
1567 continue;
1568
1569 rqstp_index = 0;
1570 list_for_each_entry_rcu(rqstp,
1571 &nn->nfsd_serv->sv_pools[i].sp_all_threads,
1572 rq_all) {
1573 struct nfsd_genl_rqstp genl_rqstp;
1574 unsigned int status_counter;
1575
1576 if (rqstp_index++ < cb->args[1]) /* already consumed */
1577 continue;
1578 /*
1579 * Acquire rq_status_counter before parsing the rqst
1580 * fields. rq_status_counter is set to an odd value in
1581 * order to notify the consumers the rqstp fields are
1582 * meaningful.
1583 */
1584 status_counter =
1585 smp_load_acquire(&rqstp->rq_status_counter);
1586 if (!(status_counter & 1))
1587 continue;
1588
1589 genl_rqstp.rq_xid = rqstp->rq_xid;
1590 genl_rqstp.rq_flags = rqstp->rq_flags;
1591 genl_rqstp.rq_vers = rqstp->rq_vers;
1592 genl_rqstp.rq_prog = rqstp->rq_prog;
1593 genl_rqstp.rq_proc = rqstp->rq_proc;
1594 genl_rqstp.rq_stime = rqstp->rq_stime;
1595 genl_rqstp.rq_opcnt = 0;
1596 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
1597 sizeof(struct sockaddr));
1598 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
1599 sizeof(struct sockaddr));
1600
1601#ifdef CONFIG_NFSD_V4
1602 if (rqstp->rq_vers == NFS4_VERSION &&
1603 rqstp->rq_proc == NFSPROC4_COMPOUND) {
1604 /* NFSv4 compound */
1605 struct nfsd4_compoundargs *args;
1606 int j;
1607
1608 args = rqstp->rq_argp;
1609 genl_rqstp.rq_opcnt = args->opcnt;
1610 for (j = 0; j < genl_rqstp.rq_opcnt; j++)
1611 genl_rqstp.rq_opnum[j] =
1612 args->ops[j].opnum;
1613 }
1614#endif /* CONFIG_NFSD_V4 */
1615
1616 /*
1617 * Acquire rq_status_counter before reporting the rqst
1618 * fields to the user.
1619 */
1620 if (smp_load_acquire(&rqstp->rq_status_counter) !=
1621 status_counter)
1622 continue;
1623
1624 ret = nfsd_genl_rpc_status_compose_msg(skb, cb,
1625 &genl_rqstp);
1626 if (ret)
1627 goto out;
1628 }
1629 }
1630
1631 cb->args[0] = i;
1632 cb->args[1] = rqstp_index;
1633 ret = skb->len;
1634out:
1635 rcu_read_unlock();
1636
1637 return ret;
1638}
1639
1640/**
1641 * nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing
1642 * @cb: netlink metadata and command arguments
1643 *
1644 * Return values:
1645 * %0: Success
1646 */
1647int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
1648{
1649 mutex_unlock(&nfsd_mutex);
1650
1651 return 0;
1652}
1653
1654/**
1655 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
1656 * @net: a freshly-created network namespace
1657 *
1658 * This information stays around as long as the network namespace is
1659 * alive whether or not there is an NFSD instance running in the
1660 * namespace.
1661 *
1662 * Returns zero on success, or a negative errno otherwise.
1663 */
1664static __net_init int nfsd_net_init(struct net *net)
1665{
1666 int retval;
1667 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1668
1669 retval = nfsd_export_init(net);
1670 if (retval)
1671 goto out_export_error;
1672 retval = nfsd_idmap_init(net);
1673 if (retval)
1674 goto out_idmap_error;
1675 retval = nfsd_stat_counters_init(nn);
1676 if (retval)
1677 goto out_repcache_error;
1678 memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats));
1679 nn->nfsd_svcstats.program = &nfsd_program;
1680 nn->nfsd_versions = NULL;
1681 nn->nfsd4_minorversions = NULL;
1682 nfsd4_init_leases_net(nn);
1683 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
1684 seqlock_init(&nn->writeverf_lock);
1685 nfsd_proc_stat_init(net);
1686
1687 return 0;
1688
1689out_repcache_error:
1690 nfsd_idmap_shutdown(net);
1691out_idmap_error:
1692 nfsd_export_shutdown(net);
1693out_export_error:
1694 return retval;
1695}
1696
1697/**
1698 * nfsd_net_exit - Release the nfsd_net portion of a net namespace
1699 * @net: a network namespace that is about to be destroyed
1700 *
1701 */
1702static __net_exit void nfsd_net_exit(struct net *net)
1703{
1704 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1705
1706 nfsd_proc_stat_shutdown(net);
1707 nfsd_stat_counters_destroy(nn);
1708 nfsd_idmap_shutdown(net);
1709 nfsd_export_shutdown(net);
1710 nfsd_netns_free_versions(nn);
1711}
1712
1713static struct pernet_operations nfsd_net_ops = {
1714 .init = nfsd_net_init,
1715 .exit = nfsd_net_exit,
1716 .id = &nfsd_net_id,
1717 .size = sizeof(struct nfsd_net),
1718};
1719
1720static int __init init_nfsd(void)
1721{
1722 int retval;
1723
1724 retval = nfsd4_init_slabs();
1725 if (retval)
1726 return retval;
1727 retval = nfsd4_init_pnfs();
1728 if (retval)
1729 goto out_free_slabs;
1730 retval = nfsd_drc_slab_create();
1731 if (retval)
1732 goto out_free_pnfs;
1733 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1734 retval = create_proc_exports_entry();
1735 if (retval)
1736 goto out_free_lockd;
1737 retval = register_pernet_subsys(&nfsd_net_ops);
1738 if (retval < 0)
1739 goto out_free_exports;
1740 retval = register_cld_notifier();
1741 if (retval)
1742 goto out_free_subsys;
1743 retval = nfsd4_create_laundry_wq();
1744 if (retval)
1745 goto out_free_cld;
1746 retval = register_filesystem(&nfsd_fs_type);
1747 if (retval)
1748 goto out_free_all;
1749 retval = genl_register_family(&nfsd_nl_family);
1750 if (retval)
1751 goto out_free_all;
1752
1753 return 0;
1754out_free_all:
1755 nfsd4_destroy_laundry_wq();
1756out_free_cld:
1757 unregister_cld_notifier();
1758out_free_subsys:
1759 unregister_pernet_subsys(&nfsd_net_ops);
1760out_free_exports:
1761 remove_proc_entry("fs/nfs/exports", NULL);
1762 remove_proc_entry("fs/nfs", NULL);
1763out_free_lockd:
1764 nfsd_lockd_shutdown();
1765 nfsd_drc_slab_free();
1766out_free_pnfs:
1767 nfsd4_exit_pnfs();
1768out_free_slabs:
1769 nfsd4_free_slabs();
1770 return retval;
1771}
1772
1773static void __exit exit_nfsd(void)
1774{
1775 genl_unregister_family(&nfsd_nl_family);
1776 unregister_filesystem(&nfsd_fs_type);
1777 nfsd4_destroy_laundry_wq();
1778 unregister_cld_notifier();
1779 unregister_pernet_subsys(&nfsd_net_ops);
1780 nfsd_drc_slab_free();
1781 remove_proc_entry("fs/nfs/exports", NULL);
1782 remove_proc_entry("fs/nfs", NULL);
1783 nfsd_lockd_shutdown();
1784 nfsd4_free_slabs();
1785 nfsd4_exit_pnfs();
1786}
1787
1788MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1789MODULE_DESCRIPTION("In-kernel NFS server");
1790MODULE_LICENSE("GPL");
1791module_init(init_nfsd)
1792module_exit(exit_nfsd)