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Linux 6.14-rc1
[linux.git] / fs / nfsd / nfsctl.c
blobce2a71e4904c1d0b6dd4049a4ad38cbc3bc74824
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 */
36 enum {
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_Filecache,
52 NFSD_Leasetime,
53 NFSD_Gracetime,
54 NFSD_RecoveryDir,
55 NFSD_V4EndGrace,
56 NFSD_MaxReserved
57 };
58
59 /*
60 * write() for these nodes.
61 */
62 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
63 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
64 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
65 static ssize_t write_threads(struct file *file, char *buf, size_t size);
66 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
67 static ssize_t write_versions(struct file *file, char *buf, size_t size);
68 static ssize_t write_ports(struct file *file, char *buf, size_t size);
69 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
70 #ifdef CONFIG_NFSD_V4
71 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
72 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
73 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
74 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
75 #endif
76 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
77 #endif
78
79 static 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 #ifdef CONFIG_NFSD_V4
89 [NFSD_Leasetime] = write_leasetime,
90 [NFSD_Gracetime] = write_gracetime,
91 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
92 [NFSD_RecoveryDir] = write_recoverydir,
93 #endif
94 [NFSD_V4EndGrace] = write_v4_end_grace,
95 #endif
96 };
97
98 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
99 {
100 ino_t ino = file_inode(file)->i_ino;
101 char *data;
102 ssize_t rv;
103
104 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
105 return -EINVAL;
106
107 data = simple_transaction_get(file, buf, size);
108 if (IS_ERR(data))
109 return PTR_ERR(data);
110
111 rv = write_op[ino](file, data, size);
112 if (rv < 0)
113 return rv;
114
115 simple_transaction_set(file, rv);
116 return size;
117 }
118
119 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
120 {
121 if (! file->private_data) {
122 /* An attempt to read a transaction file without writing
123 * causes a 0-byte write so that the file can return
124 * state information
125 */
126 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
127 if (rv < 0)
128 return rv;
129 }
130 return simple_transaction_read(file, buf, size, pos);
131 }
132
133 static const struct file_operations transaction_ops = {
134 .write = nfsctl_transaction_write,
135 .read = nfsctl_transaction_read,
136 .release = simple_transaction_release,
137 .llseek = default_llseek,
138 };
139
140 static int exports_net_open(struct net *net, struct file *file)
141 {
142 int err;
143 struct seq_file *seq;
144 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
145
146 err = seq_open(file, &nfs_exports_op);
147 if (err)
148 return err;
149
150 seq = file->private_data;
151 seq->private = nn->svc_export_cache;
152 return 0;
153 }
154
155 static int exports_nfsd_open(struct inode *inode, struct file *file)
156 {
157 return exports_net_open(inode->i_sb->s_fs_info, file);
158 }
159
160 static const struct file_operations exports_nfsd_operations = {
161 .open = exports_nfsd_open,
162 .read = seq_read,
163 .llseek = seq_lseek,
164 .release = seq_release,
165 };
166
167 static int export_features_show(struct seq_file *m, void *v)
168 {
169 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
170 return 0;
171 }
172
173 DEFINE_SHOW_ATTRIBUTE(export_features);
174
175 static int nfsd_pool_stats_open(struct inode *inode, struct file *file)
176 {
177 struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id);
178
179 return svc_pool_stats_open(&nn->nfsd_info, file);
180 }
181
182 static const struct file_operations pool_stats_operations = {
183 .open = nfsd_pool_stats_open,
184 .read = seq_read,
185 .llseek = seq_lseek,
186 .release = seq_release,
187 };
188
189 DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
190
191 DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
192
193 /*----------------------------------------------------------------------------*/
194 /*
195 * payload - write methods
196 */
197
198 static inline struct net *netns(struct file *file)
199 {
200 return file_inode(file)->i_sb->s_fs_info;
201 }
202
203 /*
204 * write_unlock_ip - Release all locks used by a client
205 *
206 * Experimental.
207 *
208 * Input:
209 * buf: '\n'-terminated C string containing a
210 * presentation format IP address
211 * size: length of C string in @buf
212 * Output:
213 * On success: returns zero if all specified locks were released;
214 * returns one if one or more locks were not released
215 * On error: return code is negative errno value
216 */
217 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
218 {
219 struct sockaddr_storage address;
220 struct sockaddr *sap = (struct sockaddr *)&address;
221 size_t salen = sizeof(address);
222 char *fo_path;
223 struct net *net = netns(file);
224
225 /* sanity check */
226 if (size == 0)
227 return -EINVAL;
228
229 if (buf[size-1] != '\n')
230 return -EINVAL;
231
232 fo_path = buf;
233 if (qword_get(&buf, fo_path, size) < 0)
234 return -EINVAL;
235
236 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
237 return -EINVAL;
238
239 trace_nfsd_ctl_unlock_ip(net, buf);
240 return nlmsvc_unlock_all_by_ip(sap);
241 }
242
243 /*
244 * write_unlock_fs - Release all locks on a local file system
245 *
246 * Experimental.
247 *
248 * Input:
249 * buf: '\n'-terminated C string containing the
250 * absolute pathname of a local file system
251 * size: length of C string in @buf
252 * Output:
253 * On success: returns zero if all specified locks were released;
254 * returns one if one or more locks were not released
255 * On error: return code is negative errno value
256 */
257 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
258 {
259 struct path path;
260 char *fo_path;
261 int error;
262
263 /* sanity check */
264 if (size == 0)
265 return -EINVAL;
266
267 if (buf[size-1] != '\n')
268 return -EINVAL;
269
270 fo_path = buf;
271 if (qword_get(&buf, fo_path, size) < 0)
272 return -EINVAL;
273 trace_nfsd_ctl_unlock_fs(netns(file), fo_path);
274 error = kern_path(fo_path, 0, &path);
275 if (error)
276 return error;
277
278 /*
279 * XXX: Needs better sanity checking. Otherwise we could end up
280 * releasing locks on the wrong file system.
281 *
282 * For example:
283 * 1. Does the path refer to a directory?
284 * 2. Is that directory a mount point, or
285 * 3. Is that directory the root of an exported file system?
286 */
287 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
288 nfsd4_revoke_states(netns(file), path.dentry->d_sb);
289
290 path_put(&path);
291 return error;
292 }
293
294 /*
295 * write_filehandle - Get a variable-length NFS file handle by path
296 *
297 * On input, the buffer contains a '\n'-terminated C string comprised of
298 * three alphanumeric words separated by whitespace. The string may
299 * contain escape sequences.
300 *
301 * Input:
302 * buf:
303 * domain: client domain name
304 * path: export pathname
305 * maxsize: numeric maximum size of
306 * @buf
307 * size: length of C string in @buf
308 * Output:
309 * On success: passed-in buffer filled with '\n'-terminated C
310 * string containing a ASCII hex text version
311 * of the NFS file handle;
312 * return code is the size in bytes of the string
313 * On error: return code is negative errno value
314 */
315 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
316 {
317 char *dname, *path;
318 int maxsize;
319 char *mesg = buf;
320 int len;
321 struct auth_domain *dom;
322 struct knfsd_fh fh;
323
324 if (size == 0)
325 return -EINVAL;
326
327 if (buf[size-1] != '\n')
328 return -EINVAL;
329 buf[size-1] = 0;
330
331 dname = mesg;
332 len = qword_get(&mesg, dname, size);
333 if (len <= 0)
334 return -EINVAL;
335
336 path = dname+len+1;
337 len = qword_get(&mesg, path, size);
338 if (len <= 0)
339 return -EINVAL;
340
341 len = get_int(&mesg, &maxsize);
342 if (len)
343 return len;
344
345 if (maxsize < NFS_FHSIZE)
346 return -EINVAL;
347 maxsize = min(maxsize, NFS3_FHSIZE);
348
349 if (qword_get(&mesg, mesg, size) > 0)
350 return -EINVAL;
351
352 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize);
353
354 /* we have all the words, they are in buf.. */
355 dom = unix_domain_find(dname);
356 if (!dom)
357 return -ENOMEM;
358
359 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
360 auth_domain_put(dom);
361 if (len)
362 return len;
363
364 mesg = buf;
365 len = SIMPLE_TRANSACTION_LIMIT;
366 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
367 mesg[-1] = '\n';
368 return mesg - buf;
369 }
370
371 /*
372 * write_threads - Start NFSD, or report the current number of running threads
373 *
374 * Input:
375 * buf: ignored
376 * size: zero
377 * Output:
378 * On success: passed-in buffer filled with '\n'-terminated C
379 * string numeric value representing the number of
380 * running NFSD threads;
381 * return code is the size in bytes of the string
382 * On error: return code is zero
383 *
384 * OR
385 *
386 * Input:
387 * buf: C string containing an unsigned
388 * integer value representing the
389 * number of NFSD threads to start
390 * size: non-zero length of C string in @buf
391 * Output:
392 * On success: NFS service is started;
393 * passed-in buffer filled with '\n'-terminated C
394 * string numeric value representing the number of
395 * running NFSD threads;
396 * return code is the size in bytes of the string
397 * On error: return code is zero or a negative errno value
398 */
399 static ssize_t write_threads(struct file *file, char *buf, size_t size)
400 {
401 char *mesg = buf;
402 int rv;
403 struct net *net = netns(file);
404
405 if (size > 0) {
406 int newthreads;
407 rv = get_int(&mesg, &newthreads);
408 if (rv)
409 return rv;
410 if (newthreads < 0)
411 return -EINVAL;
412 trace_nfsd_ctl_threads(net, newthreads);
413 mutex_lock(&nfsd_mutex);
414 rv = nfsd_svc(1, &newthreads, net, file->f_cred, NULL);
415 mutex_unlock(&nfsd_mutex);
416 if (rv < 0)
417 return rv;
418 } else
419 rv = nfsd_nrthreads(net);
420
421 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
422 }
423
424 /*
425 * write_pool_threads - Set or report the current number of threads per pool
426 *
427 * Input:
428 * buf: ignored
429 * size: zero
430 *
431 * OR
432 *
433 * Input:
434 * buf: C string containing whitespace-
435 * separated unsigned integer values
436 * representing the number of NFSD
437 * threads to start in each pool
438 * size: non-zero length of C string in @buf
439 * Output:
440 * On success: passed-in buffer filled with '\n'-terminated C
441 * string containing integer values representing the
442 * number of NFSD threads in each pool;
443 * return code is the size in bytes of the string
444 * On error: return code is zero or a negative errno value
445 */
446 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
447 {
448 /* if size > 0, look for an array of number of threads per node
449 * and apply them then write out number of threads per node as reply
450 */
451 char *mesg = buf;
452 int i;
453 int rv;
454 int len;
455 int npools;
456 int *nthreads;
457 struct net *net = netns(file);
458
459 mutex_lock(&nfsd_mutex);
460 npools = nfsd_nrpools(net);
461 if (npools == 0) {
462 /*
463 * NFS is shut down. The admin can start it by
464 * writing to the threads file but NOT the pool_threads
465 * file, sorry. Report zero threads.
466 */
467 mutex_unlock(&nfsd_mutex);
468 strcpy(buf, "0\n");
469 return strlen(buf);
470 }
471
472 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
473 rv = -ENOMEM;
474 if (nthreads == NULL)
475 goto out_free;
476
477 if (size > 0) {
478 for (i = 0; i < npools; i++) {
479 rv = get_int(&mesg, &nthreads[i]);
480 if (rv == -ENOENT)
481 break; /* fewer numbers than pools */
482 if (rv)
483 goto out_free; /* syntax error */
484 rv = -EINVAL;
485 if (nthreads[i] < 0)
486 goto out_free;
487 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]);
488 }
489
490 /*
491 * There must always be a thread in pool 0; the admin
492 * can't shut down NFS completely using pool_threads.
493 */
494 if (nthreads[0] == 0)
495 nthreads[0] = 1;
496
497 rv = nfsd_set_nrthreads(i, nthreads, net);
498 if (rv)
499 goto out_free;
500 }
501
502 rv = nfsd_get_nrthreads(npools, nthreads, net);
503 if (rv)
504 goto out_free;
505
506 mesg = buf;
507 size = SIMPLE_TRANSACTION_LIMIT;
508 for (i = 0; i < npools && size > 0; i++) {
509 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
510 len = strlen(mesg);
511 size -= len;
512 mesg += len;
513 }
514 rv = mesg - buf;
515 out_free:
516 kfree(nthreads);
517 mutex_unlock(&nfsd_mutex);
518 return rv;
519 }
520
521 static ssize_t
522 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
523 const char *sep, unsigned vers, int minor)
524 {
525 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
526 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
527
528 if (vers == 4 && minor >= 0 &&
529 !nfsd_minorversion(nn, minor, NFSD_TEST))
530 supported = false;
531 if (minor == 0 && supported)
532 /*
533 * special case for backward compatability.
534 * +4.0 is never reported, it is implied by
535 * +4, unless -4.0 is present.
536 */
537 return 0;
538 return snprintf(buf, remaining, format, sep,
539 supported ? '+' : '-', vers, minor);
540 }
541
542 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
543 {
544 char *mesg = buf;
545 char *vers, *minorp, sign;
546 int len, num, remaining;
547 ssize_t tlen = 0;
548 char *sep;
549 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
550
551 if (size > 0) {
552 if (nn->nfsd_serv)
553 /* Cannot change versions without updating
554 * nn->nfsd_serv->sv_xdrsize, and reallocing
555 * rq_argp and rq_resp
556 */
557 return -EBUSY;
558 if (buf[size-1] != '\n')
559 return -EINVAL;
560 buf[size-1] = 0;
561 trace_nfsd_ctl_version(netns(file), buf);
562
563 vers = mesg;
564 len = qword_get(&mesg, vers, size);
565 if (len <= 0) return -EINVAL;
566 do {
567 enum vers_op cmd;
568 unsigned minor;
569 sign = *vers;
570 if (sign == '+' || sign == '-')
571 num = simple_strtol((vers+1), &minorp, 0);
572 else
573 num = simple_strtol(vers, &minorp, 0);
574 if (*minorp == '.') {
575 if (num != 4)
576 return -EINVAL;
577 if (kstrtouint(minorp+1, 0, &minor) < 0)
578 return -EINVAL;
579 }
580
581 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
582 switch(num) {
583 #ifdef CONFIG_NFSD_V2
584 case 2:
585 #endif
586 case 3:
587 nfsd_vers(nn, num, cmd);
588 break;
589 case 4:
590 if (*minorp == '.') {
591 if (nfsd_minorversion(nn, minor, cmd) < 0)
592 return -EINVAL;
593 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
594 /*
595 * Either we have +4 and no minors are enabled,
596 * or we have -4 and at least one minor is enabled.
597 * In either case, propagate 'cmd' to all minors.
598 */
599 minor = 0;
600 while (nfsd_minorversion(nn, minor, cmd) >= 0)
601 minor++;
602 }
603 break;
604 default:
605 /* Ignore requests to disable non-existent versions */
606 if (cmd == NFSD_SET)
607 return -EINVAL;
608 }
609 vers += len + 1;
610 } while ((len = qword_get(&mesg, vers, size)) > 0);
611 /* If all get turned off, turn them back on, as
612 * having no versions is BAD
613 */
614 nfsd_reset_versions(nn);
615 }
616
617 /* Now write current state into reply buffer */
618 sep = "";
619 remaining = SIMPLE_TRANSACTION_LIMIT;
620 for (num=2 ; num <= 4 ; num++) {
621 int minor;
622 if (!nfsd_vers(nn, num, NFSD_AVAIL))
623 continue;
624
625 minor = -1;
626 do {
627 len = nfsd_print_version_support(nn, buf, remaining,
628 sep, num, minor);
629 if (len >= remaining)
630 goto out;
631 remaining -= len;
632 buf += len;
633 tlen += len;
634 minor++;
635 if (len)
636 sep = " ";
637 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
638 }
639 out:
640 len = snprintf(buf, remaining, "\n");
641 if (len >= remaining)
642 return -EINVAL;
643 return tlen + len;
644 }
645
646 /*
647 * write_versions - Set or report the available NFS protocol versions
648 *
649 * Input:
650 * buf: ignored
651 * size: zero
652 * Output:
653 * On success: passed-in buffer filled with '\n'-terminated C
654 * string containing positive or negative integer
655 * values representing the current status of each
656 * protocol version;
657 * return code is the size in bytes of the string
658 * On error: return code is zero or a negative errno value
659 *
660 * OR
661 *
662 * Input:
663 * buf: C string containing whitespace-
664 * separated positive or negative
665 * integer values representing NFS
666 * protocol versions to enable ("+n")
667 * or disable ("-n")
668 * size: non-zero length of C string in @buf
669 * Output:
670 * On success: status of zero or more protocol versions has
671 * been updated; passed-in buffer filled with
672 * '\n'-terminated C string containing positive
673 * or negative integer values representing the
674 * current status of each protocol version;
675 * return code is the size in bytes of the string
676 * On error: return code is zero or a negative errno value
677 */
678 static ssize_t write_versions(struct file *file, char *buf, size_t size)
679 {
680 ssize_t rv;
681
682 mutex_lock(&nfsd_mutex);
683 rv = __write_versions(file, buf, size);
684 mutex_unlock(&nfsd_mutex);
685 return rv;
686 }
687
688 /*
689 * Zero-length write. Return a list of NFSD's current listener
690 * transports.
691 */
692 static ssize_t __write_ports_names(char *buf, struct net *net)
693 {
694 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
695
696 if (nn->nfsd_serv == NULL)
697 return 0;
698 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
699 }
700
701 /*
702 * A single 'fd' number was written, in which case it must be for
703 * a socket of a supported family/protocol, and we use it as an
704 * nfsd listener.
705 */
706 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
707 {
708 char *mesg = buf;
709 int fd, err;
710 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
711 struct svc_serv *serv;
712
713 err = get_int(&mesg, &fd);
714 if (err != 0 || fd < 0)
715 return -EINVAL;
716 trace_nfsd_ctl_ports_addfd(net, fd);
717
718 err = nfsd_create_serv(net);
719 if (err != 0)
720 return err;
721
722 serv = nn->nfsd_serv;
723 err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
724
725 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
726 nfsd_destroy_serv(net);
727
728 return err;
729 }
730
731 /*
732 * A transport listener is added by writing its transport name and
733 * a port number.
734 */
735 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
736 {
737 char transport[16];
738 struct svc_xprt *xprt;
739 int port, err;
740 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
741 struct svc_serv *serv;
742
743 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
744 return -EINVAL;
745
746 if (port < 1 || port > USHRT_MAX)
747 return -EINVAL;
748 trace_nfsd_ctl_ports_addxprt(net, transport, port);
749
750 err = nfsd_create_serv(net);
751 if (err != 0)
752 return err;
753
754 serv = nn->nfsd_serv;
755 err = svc_xprt_create(serv, transport, net,
756 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
757 if (err < 0)
758 goto out_err;
759
760 err = svc_xprt_create(serv, transport, net,
761 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
762 if (err < 0 && err != -EAFNOSUPPORT)
763 goto out_close;
764
765 return 0;
766 out_close:
767 xprt = svc_find_xprt(serv, transport, net, PF_INET, port);
768 if (xprt != NULL) {
769 svc_xprt_close(xprt);
770 svc_xprt_put(xprt);
771 }
772 out_err:
773 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
774 nfsd_destroy_serv(net);
775
776 return err;
777 }
778
779 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
780 struct net *net)
781 {
782 if (size == 0)
783 return __write_ports_names(buf, net);
784
785 if (isdigit(buf[0]))
786 return __write_ports_addfd(buf, net, file->f_cred);
787
788 if (isalpha(buf[0]))
789 return __write_ports_addxprt(buf, net, file->f_cred);
790
791 return -EINVAL;
792 }
793
794 /*
795 * write_ports - Pass a socket file descriptor or transport name to listen on
796 *
797 * Input:
798 * buf: ignored
799 * size: zero
800 * Output:
801 * On success: passed-in buffer filled with a '\n'-terminated C
802 * string containing a whitespace-separated list of
803 * named NFSD listeners;
804 * return code is the size in bytes of the string
805 * On error: return code is zero or a negative errno value
806 *
807 * OR
808 *
809 * Input:
810 * buf: C string containing an unsigned
811 * integer value representing a bound
812 * but unconnected socket that is to be
813 * used as an NFSD listener; listen(3)
814 * must be called for a SOCK_STREAM
815 * socket, otherwise it is ignored
816 * size: non-zero length of C string in @buf
817 * Output:
818 * On success: NFS service is started;
819 * passed-in buffer filled with a '\n'-terminated C
820 * string containing a unique alphanumeric name of
821 * the listener;
822 * return code is the size in bytes of the string
823 * On error: return code is a negative errno value
824 *
825 * OR
826 *
827 * Input:
828 * buf: C string containing a transport
829 * name and an unsigned integer value
830 * representing the port to listen on,
831 * separated by whitespace
832 * size: non-zero length of C string in @buf
833 * Output:
834 * On success: returns zero; NFS service is started
835 * On error: return code is a negative errno value
836 */
837 static ssize_t write_ports(struct file *file, char *buf, size_t size)
838 {
839 ssize_t rv;
840
841 mutex_lock(&nfsd_mutex);
842 rv = __write_ports(file, buf, size, netns(file));
843 mutex_unlock(&nfsd_mutex);
844 return rv;
845 }
846
847
848 int nfsd_max_blksize;
849
850 /*
851 * write_maxblksize - Set or report the current NFS blksize
852 *
853 * Input:
854 * buf: ignored
855 * size: zero
856 *
857 * OR
858 *
859 * Input:
860 * buf: C string containing an unsigned
861 * integer value representing the new
862 * NFS blksize
863 * size: non-zero length of C string in @buf
864 * Output:
865 * On success: passed-in buffer filled with '\n'-terminated C string
866 * containing numeric value of the current NFS blksize
867 * setting;
868 * return code is the size in bytes of the string
869 * On error: return code is zero or a negative errno value
870 */
871 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
872 {
873 char *mesg = buf;
874 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
875
876 if (size > 0) {
877 int bsize;
878 int rv = get_int(&mesg, &bsize);
879 if (rv)
880 return rv;
881 trace_nfsd_ctl_maxblksize(netns(file), bsize);
882
883 /* force bsize into allowed range and
884 * required alignment.
885 */
886 bsize = max_t(int, bsize, 1024);
887 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
888 bsize &= ~(1024-1);
889 mutex_lock(&nfsd_mutex);
890 if (nn->nfsd_serv) {
891 mutex_unlock(&nfsd_mutex);
892 return -EBUSY;
893 }
894 nfsd_max_blksize = bsize;
895 mutex_unlock(&nfsd_mutex);
896 }
897
898 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
899 nfsd_max_blksize);
900 }
901
902 #ifdef CONFIG_NFSD_V4
903 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
904 time64_t *time, struct nfsd_net *nn)
905 {
906 struct dentry *dentry = file_dentry(file);
907 char *mesg = buf;
908 int rv, i;
909
910 if (size > 0) {
911 if (nn->nfsd_serv)
912 return -EBUSY;
913 rv = get_int(&mesg, &i);
914 if (rv)
915 return rv;
916 trace_nfsd_ctl_time(netns(file), dentry->d_name.name,
917 dentry->d_name.len, i);
918
919 /*
920 * Some sanity checking. We don't have a reason for
921 * these particular numbers, but problems with the
922 * extremes are:
923 * - Too short: the briefest network outage may
924 * cause clients to lose all their locks. Also,
925 * the frequent polling may be wasteful.
926 * - Too long: do you really want reboot recovery
927 * to take more than an hour? Or to make other
928 * clients wait an hour before being able to
929 * revoke a dead client's locks?
930 */
931 if (i < 10 || i > 3600)
932 return -EINVAL;
933 *time = i;
934 }
935
936 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
937 }
938
939 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
940 time64_t *time, struct nfsd_net *nn)
941 {
942 ssize_t rv;
943
944 mutex_lock(&nfsd_mutex);
945 rv = __nfsd4_write_time(file, buf, size, time, nn);
946 mutex_unlock(&nfsd_mutex);
947 return rv;
948 }
949
950 /*
951 * write_leasetime - Set or report the current NFSv4 lease time
952 *
953 * Input:
954 * buf: ignored
955 * size: zero
956 *
957 * OR
958 *
959 * Input:
960 * buf: C string containing an unsigned
961 * integer value representing the new
962 * NFSv4 lease expiry time
963 * size: non-zero length of C string in @buf
964 * Output:
965 * On success: passed-in buffer filled with '\n'-terminated C
966 * string containing unsigned integer value of the
967 * current lease expiry time;
968 * return code is the size in bytes of the string
969 * On error: return code is zero or a negative errno value
970 */
971 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
972 {
973 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
974 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
975 }
976
977 /*
978 * write_gracetime - Set or report current NFSv4 grace period time
979 *
980 * As above, but sets the time of the NFSv4 grace period.
981 *
982 * Note this should never be set to less than the *previous*
983 * lease-period time, but we don't try to enforce this. (In the common
984 * case (a new boot), we don't know what the previous lease time was
985 * anyway.)
986 */
987 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
988 {
989 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
990 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
991 }
992
993 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
994 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
995 struct nfsd_net *nn)
996 {
997 char *mesg = buf;
998 char *recdir;
999 int len, status;
1000
1001 if (size > 0) {
1002 if (nn->nfsd_serv)
1003 return -EBUSY;
1004 if (size > PATH_MAX || buf[size-1] != '\n')
1005 return -EINVAL;
1006 buf[size-1] = 0;
1007
1008 recdir = mesg;
1009 len = qword_get(&mesg, recdir, size);
1010 if (len <= 0)
1011 return -EINVAL;
1012 trace_nfsd_ctl_recoverydir(netns(file), recdir);
1013
1014 status = nfs4_reset_recoverydir(recdir);
1015 if (status)
1016 return status;
1017 }
1018
1019 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1020 nfs4_recoverydir());
1021 }
1022
1023 /*
1024 * write_recoverydir - Set or report the pathname of the recovery directory
1025 *
1026 * Input:
1027 * buf: ignored
1028 * size: zero
1029 *
1030 * OR
1031 *
1032 * Input:
1033 * buf: C string containing the pathname
1034 * of the directory on a local file
1035 * system containing permanent NFSv4
1036 * recovery data
1037 * size: non-zero length of C string in @buf
1038 * Output:
1039 * On success: passed-in buffer filled with '\n'-terminated C string
1040 * containing the current recovery pathname setting;
1041 * return code is the size in bytes of the string
1042 * On error: return code is zero or a negative errno value
1043 */
1044 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1045 {
1046 ssize_t rv;
1047 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1048
1049 mutex_lock(&nfsd_mutex);
1050 rv = __write_recoverydir(file, buf, size, nn);
1051 mutex_unlock(&nfsd_mutex);
1052 return rv;
1053 }
1054 #endif
1055
1056 /*
1057 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1058 *
1059 * Input:
1060 * buf: ignored
1061 * size: zero
1062 * OR
1063 *
1064 * Input:
1065 * buf: any value
1066 * size: non-zero length of C string in @buf
1067 * Output:
1068 * passed-in buffer filled with "Y" or "N" with a newline
1069 * and NULL-terminated C string. This indicates whether
1070 * the grace period has ended in the current net
1071 * namespace. Return code is the size in bytes of the
1072 * string. Writing a string that starts with 'Y', 'y', or
1073 * '1' to the file will end the grace period for nfsd's v4
1074 * lock manager.
1075 */
1076 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1077 {
1078 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1079
1080 if (size > 0) {
1081 switch(buf[0]) {
1082 case 'Y':
1083 case 'y':
1084 case '1':
1085 if (!nn->nfsd_serv)
1086 return -EBUSY;
1087 trace_nfsd_end_grace(netns(file));
1088 nfsd4_end_grace(nn);
1089 break;
1090 default:
1091 return -EINVAL;
1092 }
1093 }
1094
1095 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1096 nn->grace_ended ? 'Y' : 'N');
1097 }
1098
1099 #endif
1100
1101 /*----------------------------------------------------------------------------*/
1102 /*
1103 * populating the filesystem.
1104 */
1105
1106 /* Basically copying rpc_get_inode. */
1107 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1108 {
1109 struct inode *inode = new_inode(sb);
1110 if (!inode)
1111 return NULL;
1112 /* Following advice from simple_fill_super documentation: */
1113 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1114 inode->i_mode = mode;
1115 simple_inode_init_ts(inode);
1116 switch (mode & S_IFMT) {
1117 case S_IFDIR:
1118 inode->i_fop = &simple_dir_operations;
1119 inode->i_op = &simple_dir_inode_operations;
1120 inc_nlink(inode);
1121 break;
1122 case S_IFLNK:
1123 inode->i_op = &simple_symlink_inode_operations;
1124 break;
1125 default:
1126 break;
1127 }
1128 return inode;
1129 }
1130
1131 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1132 {
1133 struct inode *inode;
1134
1135 inode = nfsd_get_inode(dir->i_sb, mode);
1136 if (!inode)
1137 return -ENOMEM;
1138 if (ncl) {
1139 inode->i_private = ncl;
1140 kref_get(&ncl->cl_ref);
1141 }
1142 d_add(dentry, inode);
1143 inc_nlink(dir);
1144 fsnotify_mkdir(dir, dentry);
1145 return 0;
1146 }
1147
1148 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1149 {
1150 struct inode *dir = parent->d_inode;
1151 struct dentry *dentry;
1152 int ret = -ENOMEM;
1153
1154 inode_lock(dir);
1155 dentry = d_alloc_name(parent, name);
1156 if (!dentry)
1157 goto out_err;
1158 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1159 if (ret)
1160 goto out_err;
1161 out:
1162 inode_unlock(dir);
1163 return dentry;
1164 out_err:
1165 dput(dentry);
1166 dentry = ERR_PTR(ret);
1167 goto out;
1168 }
1169
1170 #if IS_ENABLED(CONFIG_SUNRPC_GSS)
1171 static int __nfsd_symlink(struct inode *dir, struct dentry *dentry,
1172 umode_t mode, const char *content)
1173 {
1174 struct inode *inode;
1175
1176 inode = nfsd_get_inode(dir->i_sb, mode);
1177 if (!inode)
1178 return -ENOMEM;
1179
1180 inode->i_link = (char *)content;
1181 inode->i_size = strlen(content);
1182
1183 d_add(dentry, inode);
1184 inc_nlink(dir);
1185 fsnotify_create(dir, dentry);
1186 return 0;
1187 }
1188
1189 /*
1190 * @content is assumed to be a NUL-terminated string that lives
1191 * longer than the symlink itself.
1192 */
1193 static void _nfsd_symlink(struct dentry *parent, const char *name,
1194 const char *content)
1195 {
1196 struct inode *dir = parent->d_inode;
1197 struct dentry *dentry;
1198 int ret;
1199
1200 inode_lock(dir);
1201 dentry = d_alloc_name(parent, name);
1202 if (!dentry)
1203 goto out;
1204 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content);
1205 if (ret)
1206 dput(dentry);
1207 out:
1208 inode_unlock(dir);
1209 }
1210 #else
1211 static inline void _nfsd_symlink(struct dentry *parent, const char *name,
1212 const char *content)
1213 {
1214 }
1215
1216 #endif
1217
1218 static void clear_ncl(struct dentry *dentry)
1219 {
1220 struct inode *inode = d_inode(dentry);
1221 struct nfsdfs_client *ncl = inode->i_private;
1222
1223 spin_lock(&inode->i_lock);
1224 inode->i_private = NULL;
1225 spin_unlock(&inode->i_lock);
1226 kref_put(&ncl->cl_ref, ncl->cl_release);
1227 }
1228
1229 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1230 {
1231 struct nfsdfs_client *nc;
1232
1233 spin_lock(&inode->i_lock);
1234 nc = inode->i_private;
1235 if (nc)
1236 kref_get(&nc->cl_ref);
1237 spin_unlock(&inode->i_lock);
1238 return nc;
1239 }
1240
1241 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1242 * code instead. */
1243 static int nfsdfs_create_files(struct dentry *root,
1244 const struct tree_descr *files,
1245 struct nfsdfs_client *ncl,
1246 struct dentry **fdentries)
1247 {
1248 struct inode *dir = d_inode(root);
1249 struct inode *inode;
1250 struct dentry *dentry;
1251 int i;
1252
1253 inode_lock(dir);
1254 for (i = 0; files->name && files->name[0]; i++, files++) {
1255 dentry = d_alloc_name(root, files->name);
1256 if (!dentry)
1257 goto out;
1258 inode = nfsd_get_inode(d_inode(root)->i_sb,
1259 S_IFREG | files->mode);
1260 if (!inode) {
1261 dput(dentry);
1262 goto out;
1263 }
1264 kref_get(&ncl->cl_ref);
1265 inode->i_fop = files->ops;
1266 inode->i_private = ncl;
1267 d_add(dentry, inode);
1268 fsnotify_create(dir, dentry);
1269 if (fdentries)
1270 fdentries[i] = dentry;
1271 }
1272 inode_unlock(dir);
1273 return 0;
1274 out:
1275 inode_unlock(dir);
1276 return -ENOMEM;
1277 }
1278
1279 /* on success, returns positive number unique to that client. */
1280 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1281 struct nfsdfs_client *ncl, u32 id,
1282 const struct tree_descr *files,
1283 struct dentry **fdentries)
1284 {
1285 struct dentry *dentry;
1286 char name[11];
1287 int ret;
1288
1289 sprintf(name, "%u", id);
1290
1291 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1292 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1293 return NULL;
1294 ret = nfsdfs_create_files(dentry, files, ncl, fdentries);
1295 if (ret) {
1296 nfsd_client_rmdir(dentry);
1297 return NULL;
1298 }
1299 return dentry;
1300 }
1301
1302 /* Taken from __rpc_rmdir: */
1303 void nfsd_client_rmdir(struct dentry *dentry)
1304 {
1305 simple_recursive_removal(dentry, clear_ncl);
1306 }
1307
1308 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1309 {
1310 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1311 nfsd_net_id);
1312 struct dentry *dentry;
1313 int ret;
1314
1315 static const struct tree_descr nfsd_files[] = {
1316 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1317 /* Per-export io stats use same ops as exports file */
1318 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1319 [NFSD_Export_features] = {"export_features",
1320 &export_features_fops, S_IRUGO},
1321 [NFSD_FO_UnlockIP] = {"unlock_ip",
1322 &transaction_ops, S_IWUSR|S_IRUSR},
1323 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1324 &transaction_ops, S_IWUSR|S_IRUSR},
1325 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1326 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1327 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1328 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1329 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1330 &nfsd_reply_cache_stats_fops, S_IRUGO},
1331 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1332 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1333 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1334 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1335 #ifdef CONFIG_NFSD_V4
1336 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1337 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1338 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1339 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1340 #endif
1341 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1342 #endif
1343 /* last one */ {""}
1344 };
1345
1346 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1347 if (ret)
1348 return ret;
1349 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes",
1350 "/proc/net/rpc/gss_krb5_enctypes");
1351 dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1352 if (IS_ERR(dentry))
1353 return PTR_ERR(dentry);
1354 nn->nfsd_client_dir = dentry;
1355 return 0;
1356 }
1357
1358 static int nfsd_fs_get_tree(struct fs_context *fc)
1359 {
1360 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1361 }
1362
1363 static void nfsd_fs_free_fc(struct fs_context *fc)
1364 {
1365 if (fc->s_fs_info)
1366 put_net(fc->s_fs_info);
1367 }
1368
1369 static const struct fs_context_operations nfsd_fs_context_ops = {
1370 .free = nfsd_fs_free_fc,
1371 .get_tree = nfsd_fs_get_tree,
1372 };
1373
1374 static int nfsd_init_fs_context(struct fs_context *fc)
1375 {
1376 put_user_ns(fc->user_ns);
1377 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1378 fc->ops = &nfsd_fs_context_ops;
1379 return 0;
1380 }
1381
1382 static void nfsd_umount(struct super_block *sb)
1383 {
1384 struct net *net = sb->s_fs_info;
1385
1386 nfsd_shutdown_threads(net);
1387
1388 kill_litter_super(sb);
1389 put_net(net);
1390 }
1391
1392 static struct file_system_type nfsd_fs_type = {
1393 .owner = THIS_MODULE,
1394 .name = "nfsd",
1395 .init_fs_context = nfsd_init_fs_context,
1396 .kill_sb = nfsd_umount,
1397 };
1398 MODULE_ALIAS_FS("nfsd");
1399
1400 #ifdef CONFIG_PROC_FS
1401
1402 static int exports_proc_open(struct inode *inode, struct file *file)
1403 {
1404 return exports_net_open(current->nsproxy->net_ns, file);
1405 }
1406
1407 static const struct proc_ops exports_proc_ops = {
1408 .proc_open = exports_proc_open,
1409 .proc_read = seq_read,
1410 .proc_lseek = seq_lseek,
1411 .proc_release = seq_release,
1412 };
1413
1414 static int create_proc_exports_entry(void)
1415 {
1416 struct proc_dir_entry *entry;
1417
1418 entry = proc_mkdir("fs/nfs", NULL);
1419 if (!entry)
1420 return -ENOMEM;
1421 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1422 if (!entry) {
1423 remove_proc_entry("fs/nfs", NULL);
1424 return -ENOMEM;
1425 }
1426 return 0;
1427 }
1428 #else /* CONFIG_PROC_FS */
1429 static int create_proc_exports_entry(void)
1430 {
1431 return 0;
1432 }
1433 #endif
1434
1435 unsigned int nfsd_net_id;
1436
1437 static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
1438 struct netlink_callback *cb,
1439 struct nfsd_genl_rqstp *rqstp)
1440 {
1441 void *hdr;
1442 u32 i;
1443
1444 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1445 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET);
1446 if (!hdr)
1447 return -ENOBUFS;
1448
1449 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) ||
1450 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) ||
1451 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) ||
1452 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) ||
1453 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) ||
1454 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME,
1455 ktime_to_us(rqstp->rq_stime),
1456 NFSD_A_RPC_STATUS_PAD))
1457 return -ENOBUFS;
1458
1459 switch (rqstp->rq_saddr.sa_family) {
1460 case AF_INET: {
1461 const struct sockaddr_in *s_in, *d_in;
1462
1463 s_in = (const struct sockaddr_in *)&rqstp->rq_saddr;
1464 d_in = (const struct sockaddr_in *)&rqstp->rq_daddr;
1465 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4,
1466 s_in->sin_addr.s_addr) ||
1467 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4,
1468 d_in->sin_addr.s_addr) ||
1469 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1470 s_in->sin_port) ||
1471 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1472 d_in->sin_port))
1473 return -ENOBUFS;
1474 break;
1475 }
1476 case AF_INET6: {
1477 const struct sockaddr_in6 *s_in, *d_in;
1478
1479 s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr;
1480 d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr;
1481 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6,
1482 &s_in->sin6_addr) ||
1483 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6,
1484 &d_in->sin6_addr) ||
1485 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1486 s_in->sin6_port) ||
1487 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1488 d_in->sin6_port))
1489 return -ENOBUFS;
1490 break;
1491 }
1492 }
1493
1494 for (i = 0; i < rqstp->rq_opcnt; i++)
1495 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS,
1496 rqstp->rq_opnum[i]))
1497 return -ENOBUFS;
1498
1499 genlmsg_end(skb, hdr);
1500 return 0;
1501 }
1502
1503 /**
1504 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit
1505 * @skb: reply buffer
1506 * @cb: netlink metadata and command arguments
1507 *
1508 * Returns the size of the reply or a negative errno.
1509 */
1510 int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
1511 struct netlink_callback *cb)
1512 {
1513 int i, ret, rqstp_index = 0;
1514 struct nfsd_net *nn;
1515
1516 mutex_lock(&nfsd_mutex);
1517
1518 nn = net_generic(sock_net(skb->sk), nfsd_net_id);
1519 if (!nn->nfsd_serv) {
1520 ret = -ENODEV;
1521 goto out_unlock;
1522 }
1523
1524 rcu_read_lock();
1525
1526 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
1527 struct svc_rqst *rqstp;
1528
1529 if (i < cb->args[0]) /* already consumed */
1530 continue;
1531
1532 rqstp_index = 0;
1533 list_for_each_entry_rcu(rqstp,
1534 &nn->nfsd_serv->sv_pools[i].sp_all_threads,
1535 rq_all) {
1536 struct nfsd_genl_rqstp genl_rqstp;
1537 unsigned int status_counter;
1538
1539 if (rqstp_index++ < cb->args[1]) /* already consumed */
1540 continue;
1541 /*
1542 * Acquire rq_status_counter before parsing the rqst
1543 * fields. rq_status_counter is set to an odd value in
1544 * order to notify the consumers the rqstp fields are
1545 * meaningful.
1546 */
1547 status_counter =
1548 smp_load_acquire(&rqstp->rq_status_counter);
1549 if (!(status_counter & 1))
1550 continue;
1551
1552 genl_rqstp.rq_xid = rqstp->rq_xid;
1553 genl_rqstp.rq_flags = rqstp->rq_flags;
1554 genl_rqstp.rq_vers = rqstp->rq_vers;
1555 genl_rqstp.rq_prog = rqstp->rq_prog;
1556 genl_rqstp.rq_proc = rqstp->rq_proc;
1557 genl_rqstp.rq_stime = rqstp->rq_stime;
1558 genl_rqstp.rq_opcnt = 0;
1559 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
1560 sizeof(struct sockaddr));
1561 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
1562 sizeof(struct sockaddr));
1563
1564 #ifdef CONFIG_NFSD_V4
1565 if (rqstp->rq_vers == NFS4_VERSION &&
1566 rqstp->rq_proc == NFSPROC4_COMPOUND) {
1567 /* NFSv4 compound */
1568 struct nfsd4_compoundargs *args;
1569 int j;
1570
1571 args = rqstp->rq_argp;
1572 genl_rqstp.rq_opcnt = args->opcnt;
1573 for (j = 0; j < genl_rqstp.rq_opcnt; j++)
1574 genl_rqstp.rq_opnum[j] =
1575 args->ops[j].opnum;
1576 }
1577 #endif /* CONFIG_NFSD_V4 */
1578
1579 /*
1580 * Acquire rq_status_counter before reporting the rqst
1581 * fields to the user.
1582 */
1583 if (smp_load_acquire(&rqstp->rq_status_counter) !=
1584 status_counter)
1585 continue;
1586
1587 ret = nfsd_genl_rpc_status_compose_msg(skb, cb,
1588 &genl_rqstp);
1589 if (ret)
1590 goto out;
1591 }
1592 }
1593
1594 cb->args[0] = i;
1595 cb->args[1] = rqstp_index;
1596 ret = skb->len;
1597 out:
1598 rcu_read_unlock();
1599 out_unlock:
1600 mutex_unlock(&nfsd_mutex);
1601
1602 return ret;
1603 }
1604
1605 /**
1606 * nfsd_nl_threads_set_doit - set the number of running threads
1607 * @skb: reply buffer
1608 * @info: netlink metadata and command arguments
1609 *
1610 * Return 0 on success or a negative errno.
1611 */
1612 int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info)
1613 {
1614 int *nthreads, count = 0, nrpools, i, ret = -EOPNOTSUPP, rem;
1615 struct net *net = genl_info_net(info);
1616 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1617 const struct nlattr *attr;
1618 const char *scope = NULL;
1619
1620 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_THREADS))
1621 return -EINVAL;
1622
1623 /* count number of SERVER_THREADS values */
1624 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
1625 if (nla_type(attr) == NFSD_A_SERVER_THREADS)
1626 count++;
1627 }
1628
1629 mutex_lock(&nfsd_mutex);
1630
1631 nrpools = max(count, nfsd_nrpools(net));
1632 nthreads = kcalloc(nrpools, sizeof(int), GFP_KERNEL);
1633 if (!nthreads) {
1634 ret = -ENOMEM;
1635 goto out_unlock;
1636 }
1637
1638 i = 0;
1639 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
1640 if (nla_type(attr) == NFSD_A_SERVER_THREADS) {
1641 nthreads[i++] = nla_get_u32(attr);
1642 if (i >= nrpools)
1643 break;
1644 }
1645 }
1646
1647 if (info->attrs[NFSD_A_SERVER_GRACETIME] ||
1648 info->attrs[NFSD_A_SERVER_LEASETIME] ||
1649 info->attrs[NFSD_A_SERVER_SCOPE]) {
1650 ret = -EBUSY;
1651 if (nn->nfsd_serv && nn->nfsd_serv->sv_nrthreads)
1652 goto out_unlock;
1653
1654 ret = -EINVAL;
1655 attr = info->attrs[NFSD_A_SERVER_GRACETIME];
1656 if (attr) {
1657 u32 gracetime = nla_get_u32(attr);
1658
1659 if (gracetime < 10 || gracetime > 3600)
1660 goto out_unlock;
1661
1662 nn->nfsd4_grace = gracetime;
1663 }
1664
1665 attr = info->attrs[NFSD_A_SERVER_LEASETIME];
1666 if (attr) {
1667 u32 leasetime = nla_get_u32(attr);
1668
1669 if (leasetime < 10 || leasetime > 3600)
1670 goto out_unlock;
1671
1672 nn->nfsd4_lease = leasetime;
1673 }
1674
1675 attr = info->attrs[NFSD_A_SERVER_SCOPE];
1676 if (attr)
1677 scope = nla_data(attr);
1678 }
1679
1680 ret = nfsd_svc(nrpools, nthreads, net, get_current_cred(), scope);
1681 if (ret > 0)
1682 ret = 0;
1683 out_unlock:
1684 mutex_unlock(&nfsd_mutex);
1685 kfree(nthreads);
1686 return ret;
1687 }
1688
1689 /**
1690 * nfsd_nl_threads_get_doit - get the number of running threads
1691 * @skb: reply buffer
1692 * @info: netlink metadata and command arguments
1693 *
1694 * Return 0 on success or a negative errno.
1695 */
1696 int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info)
1697 {
1698 struct net *net = genl_info_net(info);
1699 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1700 void *hdr;
1701 int err;
1702
1703 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
1704 if (!skb)
1705 return -ENOMEM;
1706
1707 hdr = genlmsg_iput(skb, info);
1708 if (!hdr) {
1709 err = -EMSGSIZE;
1710 goto err_free_msg;
1711 }
1712
1713 mutex_lock(&nfsd_mutex);
1714
1715 err = nla_put_u32(skb, NFSD_A_SERVER_GRACETIME,
1716 nn->nfsd4_grace) ||
1717 nla_put_u32(skb, NFSD_A_SERVER_LEASETIME,
1718 nn->nfsd4_lease) ||
1719 nla_put_string(skb, NFSD_A_SERVER_SCOPE,
1720 nn->nfsd_name);
1721 if (err)
1722 goto err_unlock;
1723
1724 if (nn->nfsd_serv) {
1725 int i;
1726
1727 for (i = 0; i < nfsd_nrpools(net); ++i) {
1728 struct svc_pool *sp = &nn->nfsd_serv->sv_pools[i];
1729
1730 err = nla_put_u32(skb, NFSD_A_SERVER_THREADS,
1731 sp->sp_nrthreads);
1732 if (err)
1733 goto err_unlock;
1734 }
1735 } else {
1736 err = nla_put_u32(skb, NFSD_A_SERVER_THREADS, 0);
1737 if (err)
1738 goto err_unlock;
1739 }
1740
1741 mutex_unlock(&nfsd_mutex);
1742
1743 genlmsg_end(skb, hdr);
1744
1745 return genlmsg_reply(skb, info);
1746
1747 err_unlock:
1748 mutex_unlock(&nfsd_mutex);
1749 err_free_msg:
1750 nlmsg_free(skb);
1751
1752 return err;
1753 }
1754
1755 /**
1756 * nfsd_nl_version_set_doit - set the nfs enabled versions
1757 * @skb: reply buffer
1758 * @info: netlink metadata and command arguments
1759 *
1760 * Return 0 on success or a negative errno.
1761 */
1762 int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info)
1763 {
1764 const struct nlattr *attr;
1765 struct nfsd_net *nn;
1766 int i, rem;
1767
1768 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_PROTO_VERSION))
1769 return -EINVAL;
1770
1771 mutex_lock(&nfsd_mutex);
1772
1773 nn = net_generic(genl_info_net(info), nfsd_net_id);
1774 if (nn->nfsd_serv) {
1775 mutex_unlock(&nfsd_mutex);
1776 return -EBUSY;
1777 }
1778
1779 /* clear current supported versions. */
1780 nfsd_vers(nn, 2, NFSD_CLEAR);
1781 nfsd_vers(nn, 3, NFSD_CLEAR);
1782 for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++)
1783 nfsd_minorversion(nn, i, NFSD_CLEAR);
1784
1785 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
1786 struct nlattr *tb[NFSD_A_VERSION_MAX + 1];
1787 u32 major, minor = 0;
1788 bool enabled;
1789
1790 if (nla_type(attr) != NFSD_A_SERVER_PROTO_VERSION)
1791 continue;
1792
1793 if (nla_parse_nested(tb, NFSD_A_VERSION_MAX, attr,
1794 nfsd_version_nl_policy, info->extack) < 0)
1795 continue;
1796
1797 if (!tb[NFSD_A_VERSION_MAJOR])
1798 continue;
1799
1800 major = nla_get_u32(tb[NFSD_A_VERSION_MAJOR]);
1801 if (tb[NFSD_A_VERSION_MINOR])
1802 minor = nla_get_u32(tb[NFSD_A_VERSION_MINOR]);
1803
1804 enabled = nla_get_flag(tb[NFSD_A_VERSION_ENABLED]);
1805
1806 switch (major) {
1807 case 4:
1808 nfsd_minorversion(nn, minor, enabled ? NFSD_SET : NFSD_CLEAR);
1809 break;
1810 case 3:
1811 case 2:
1812 if (!minor)
1813 nfsd_vers(nn, major, enabled ? NFSD_SET : NFSD_CLEAR);
1814 break;
1815 default:
1816 break;
1817 }
1818 }
1819
1820 mutex_unlock(&nfsd_mutex);
1821
1822 return 0;
1823 }
1824
1825 /**
1826 * nfsd_nl_version_get_doit - get the enabled status for all supported nfs versions
1827 * @skb: reply buffer
1828 * @info: netlink metadata and command arguments
1829 *
1830 * Return 0 on success or a negative errno.
1831 */
1832 int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info)
1833 {
1834 struct nfsd_net *nn;
1835 int i, err;
1836 void *hdr;
1837
1838 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
1839 if (!skb)
1840 return -ENOMEM;
1841
1842 hdr = genlmsg_iput(skb, info);
1843 if (!hdr) {
1844 err = -EMSGSIZE;
1845 goto err_free_msg;
1846 }
1847
1848 mutex_lock(&nfsd_mutex);
1849 nn = net_generic(genl_info_net(info), nfsd_net_id);
1850
1851 for (i = 2; i <= 4; i++) {
1852 int j;
1853
1854 for (j = 0; j <= NFSD_SUPPORTED_MINOR_VERSION; j++) {
1855 struct nlattr *attr;
1856
1857 /* Don't record any versions the kernel doesn't have
1858 * compiled in
1859 */
1860 if (!nfsd_support_version(i))
1861 continue;
1862
1863 /* NFSv{2,3} does not support minor numbers */
1864 if (i < 4 && j)
1865 continue;
1866
1867 attr = nla_nest_start(skb,
1868 NFSD_A_SERVER_PROTO_VERSION);
1869 if (!attr) {
1870 err = -EINVAL;
1871 goto err_nfsd_unlock;
1872 }
1873
1874 if (nla_put_u32(skb, NFSD_A_VERSION_MAJOR, i) ||
1875 nla_put_u32(skb, NFSD_A_VERSION_MINOR, j)) {
1876 err = -EINVAL;
1877 goto err_nfsd_unlock;
1878 }
1879
1880 /* Set the enabled flag if the version is enabled */
1881 if (nfsd_vers(nn, i, NFSD_TEST) &&
1882 (i < 4 || nfsd_minorversion(nn, j, NFSD_TEST)) &&
1883 nla_put_flag(skb, NFSD_A_VERSION_ENABLED)) {
1884 err = -EINVAL;
1885 goto err_nfsd_unlock;
1886 }
1887
1888 nla_nest_end(skb, attr);
1889 }
1890 }
1891
1892 mutex_unlock(&nfsd_mutex);
1893 genlmsg_end(skb, hdr);
1894
1895 return genlmsg_reply(skb, info);
1896
1897 err_nfsd_unlock:
1898 mutex_unlock(&nfsd_mutex);
1899 err_free_msg:
1900 nlmsg_free(skb);
1901
1902 return err;
1903 }
1904
1905 /**
1906 * nfsd_nl_listener_set_doit - set the nfs running sockets
1907 * @skb: reply buffer
1908 * @info: netlink metadata and command arguments
1909 *
1910 * Return 0 on success or a negative errno.
1911 */
1912 int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info)
1913 {
1914 struct net *net = genl_info_net(info);
1915 struct svc_xprt *xprt, *tmp;
1916 const struct nlattr *attr;
1917 struct svc_serv *serv;
1918 LIST_HEAD(permsocks);
1919 struct nfsd_net *nn;
1920 int err, rem;
1921
1922 mutex_lock(&nfsd_mutex);
1923
1924 err = nfsd_create_serv(net);
1925 if (err) {
1926 mutex_unlock(&nfsd_mutex);
1927 return err;
1928 }
1929
1930 nn = net_generic(net, nfsd_net_id);
1931 serv = nn->nfsd_serv;
1932
1933 spin_lock_bh(&serv->sv_lock);
1934
1935 /* Move all of the old listener sockets to a temp list */
1936 list_splice_init(&serv->sv_permsocks, &permsocks);
1937
1938 /*
1939 * Walk the list of server_socks from userland and move any that match
1940 * back to sv_permsocks
1941 */
1942 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
1943 struct nlattr *tb[NFSD_A_SOCK_MAX + 1];
1944 const char *xcl_name;
1945 struct sockaddr *sa;
1946
1947 if (nla_type(attr) != NFSD_A_SERVER_SOCK_ADDR)
1948 continue;
1949
1950 if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr,
1951 nfsd_sock_nl_policy, info->extack) < 0)
1952 continue;
1953
1954 if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME])
1955 continue;
1956
1957 if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa))
1958 continue;
1959
1960 xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]);
1961 sa = nla_data(tb[NFSD_A_SOCK_ADDR]);
1962
1963 /* Put back any matching sockets */
1964 list_for_each_entry_safe(xprt, tmp, &permsocks, xpt_list) {
1965 /* This shouldn't be possible */
1966 if (WARN_ON_ONCE(xprt->xpt_net != net)) {
1967 list_move(&xprt->xpt_list, &serv->sv_permsocks);
1968 continue;
1969 }
1970
1971 /* If everything matches, put it back */
1972 if (!strcmp(xprt->xpt_class->xcl_name, xcl_name) &&
1973 rpc_cmp_addr_port(sa, (struct sockaddr *)&xprt->xpt_local)) {
1974 list_move(&xprt->xpt_list, &serv->sv_permsocks);
1975 break;
1976 }
1977 }
1978 }
1979
1980 /* For now, no removing old sockets while server is running */
1981 if (serv->sv_nrthreads && !list_empty(&permsocks)) {
1982 list_splice_init(&permsocks, &serv->sv_permsocks);
1983 spin_unlock_bh(&serv->sv_lock);
1984 err = -EBUSY;
1985 goto out_unlock_mtx;
1986 }
1987
1988 /* Close the remaining sockets on the permsocks list */
1989 while (!list_empty(&permsocks)) {
1990 xprt = list_first_entry(&permsocks, struct svc_xprt, xpt_list);
1991 list_move(&xprt->xpt_list, &serv->sv_permsocks);
1992
1993 /*
1994 * Newly-created sockets are born with the BUSY bit set. Clear
1995 * it if there are no threads, since nothing can pick it up
1996 * in that case.
1997 */
1998 if (!serv->sv_nrthreads)
1999 clear_bit(XPT_BUSY, &xprt->xpt_flags);
2000
2001 set_bit(XPT_CLOSE, &xprt->xpt_flags);
2002 spin_unlock_bh(&serv->sv_lock);
2003 svc_xprt_close(xprt);
2004 spin_lock_bh(&serv->sv_lock);
2005 }
2006
2007 spin_unlock_bh(&serv->sv_lock);
2008
2009 /* walk list of addrs again, open any that still don't exist */
2010 nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
2011 struct nlattr *tb[NFSD_A_SOCK_MAX + 1];
2012 const char *xcl_name;
2013 struct sockaddr *sa;
2014 int ret;
2015
2016 if (nla_type(attr) != NFSD_A_SERVER_SOCK_ADDR)
2017 continue;
2018
2019 if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr,
2020 nfsd_sock_nl_policy, info->extack) < 0)
2021 continue;
2022
2023 if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME])
2024 continue;
2025
2026 if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa))
2027 continue;
2028
2029 xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]);
2030 sa = nla_data(tb[NFSD_A_SOCK_ADDR]);
2031
2032 xprt = svc_find_listener(serv, xcl_name, net, sa);
2033 if (xprt) {
2034 svc_xprt_put(xprt);
2035 continue;
2036 }
2037
2038 ret = svc_xprt_create_from_sa(serv, xcl_name, net, sa, 0,
2039 get_current_cred());
2040 /* always save the latest error */
2041 if (ret < 0)
2042 err = ret;
2043 }
2044
2045 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
2046 nfsd_destroy_serv(net);
2047
2048 out_unlock_mtx:
2049 mutex_unlock(&nfsd_mutex);
2050
2051 return err;
2052 }
2053
2054 /**
2055 * nfsd_nl_listener_get_doit - get the nfs running listeners
2056 * @skb: reply buffer
2057 * @info: netlink metadata and command arguments
2058 *
2059 * Return 0 on success or a negative errno.
2060 */
2061 int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info)
2062 {
2063 struct svc_xprt *xprt;
2064 struct svc_serv *serv;
2065 struct nfsd_net *nn;
2066 void *hdr;
2067 int err;
2068
2069 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
2070 if (!skb)
2071 return -ENOMEM;
2072
2073 hdr = genlmsg_iput(skb, info);
2074 if (!hdr) {
2075 err = -EMSGSIZE;
2076 goto err_free_msg;
2077 }
2078
2079 mutex_lock(&nfsd_mutex);
2080 nn = net_generic(genl_info_net(info), nfsd_net_id);
2081
2082 /* no nfs server? Just send empty socket list */
2083 if (!nn->nfsd_serv)
2084 goto out_unlock_mtx;
2085
2086 serv = nn->nfsd_serv;
2087 spin_lock_bh(&serv->sv_lock);
2088 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
2089 struct nlattr *attr;
2090
2091 attr = nla_nest_start(skb, NFSD_A_SERVER_SOCK_ADDR);
2092 if (!attr) {
2093 err = -EINVAL;
2094 goto err_serv_unlock;
2095 }
2096
2097 if (nla_put_string(skb, NFSD_A_SOCK_TRANSPORT_NAME,
2098 xprt->xpt_class->xcl_name) ||
2099 nla_put(skb, NFSD_A_SOCK_ADDR,
2100 sizeof(struct sockaddr_storage),
2101 &xprt->xpt_local)) {
2102 err = -EINVAL;
2103 goto err_serv_unlock;
2104 }
2105
2106 nla_nest_end(skb, attr);
2107 }
2108 spin_unlock_bh(&serv->sv_lock);
2109 out_unlock_mtx:
2110 mutex_unlock(&nfsd_mutex);
2111 genlmsg_end(skb, hdr);
2112
2113 return genlmsg_reply(skb, info);
2114
2115 err_serv_unlock:
2116 spin_unlock_bh(&serv->sv_lock);
2117 mutex_unlock(&nfsd_mutex);
2118 err_free_msg:
2119 nlmsg_free(skb);
2120
2121 return err;
2122 }
2123
2124 /**
2125 * nfsd_nl_pool_mode_set_doit - set the number of running threads
2126 * @skb: reply buffer
2127 * @info: netlink metadata and command arguments
2128 *
2129 * Return 0 on success or a negative errno.
2130 */
2131 int nfsd_nl_pool_mode_set_doit(struct sk_buff *skb, struct genl_info *info)
2132 {
2133 const struct nlattr *attr;
2134
2135 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_POOL_MODE_MODE))
2136 return -EINVAL;
2137
2138 attr = info->attrs[NFSD_A_POOL_MODE_MODE];
2139 return sunrpc_set_pool_mode(nla_data(attr));
2140 }
2141
2142 /**
2143 * nfsd_nl_pool_mode_get_doit - get info about pool_mode
2144 * @skb: reply buffer
2145 * @info: netlink metadata and command arguments
2146 *
2147 * Return 0 on success or a negative errno.
2148 */
2149 int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info)
2150 {
2151 struct net *net = genl_info_net(info);
2152 char buf[16];
2153 void *hdr;
2154 int err;
2155
2156 if (sunrpc_get_pool_mode(buf, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
2157 return -ERANGE;
2158
2159 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
2160 if (!skb)
2161 return -ENOMEM;
2162
2163 err = -EMSGSIZE;
2164 hdr = genlmsg_iput(skb, info);
2165 if (!hdr)
2166 goto err_free_msg;
2167
2168 err = nla_put_string(skb, NFSD_A_POOL_MODE_MODE, buf) |
2169 nla_put_u32(skb, NFSD_A_POOL_MODE_NPOOLS, nfsd_nrpools(net));
2170 if (err)
2171 goto err_free_msg;
2172
2173 genlmsg_end(skb, hdr);
2174 return genlmsg_reply(skb, info);
2175
2176 err_free_msg:
2177 nlmsg_free(skb);
2178 return err;
2179 }
2180
2181 /**
2182 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
2183 * @net: a freshly-created network namespace
2184 *
2185 * This information stays around as long as the network namespace is
2186 * alive whether or not there is an NFSD instance running in the
2187 * namespace.
2188 *
2189 * Returns zero on success, or a negative errno otherwise.
2190 */
2191 static __net_init int nfsd_net_init(struct net *net)
2192 {
2193 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2194 int retval;
2195 int i;
2196
2197 retval = nfsd_export_init(net);
2198 if (retval)
2199 goto out_export_error;
2200 retval = nfsd_idmap_init(net);
2201 if (retval)
2202 goto out_idmap_error;
2203 retval = percpu_counter_init_many(nn->counter, 0, GFP_KERNEL,
2204 NFSD_STATS_COUNTERS_NUM);
2205 if (retval)
2206 goto out_repcache_error;
2207 memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats));
2208 nn->nfsd_svcstats.program = &nfsd_programs[0];
2209 for (i = 0; i < sizeof(nn->nfsd_versions); i++)
2210 nn->nfsd_versions[i] = nfsd_support_version(i);
2211 for (i = 0; i < sizeof(nn->nfsd4_minorversions); i++)
2212 nn->nfsd4_minorversions[i] = nfsd_support_version(4);
2213 nn->nfsd_info.mutex = &nfsd_mutex;
2214 nn->nfsd_serv = NULL;
2215 nfsd4_init_leases_net(nn);
2216 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
2217 seqlock_init(&nn->writeverf_lock);
2218 nfsd_proc_stat_init(net);
2219 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2220 spin_lock_init(&nn->local_clients_lock);
2221 INIT_LIST_HEAD(&nn->local_clients);
2222 #endif
2223 return 0;
2224
2225 out_repcache_error:
2226 nfsd_idmap_shutdown(net);
2227 out_idmap_error:
2228 nfsd_export_shutdown(net);
2229 out_export_error:
2230 return retval;
2231 }
2232
2233 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2234 /**
2235 * nfsd_net_pre_exit - Disconnect localio clients from net namespace
2236 * @net: a network namespace that is about to be destroyed
2237 *
2238 * This invalidates ->net pointers held by localio clients
2239 * while they can still safely access nn->counter.
2240 */
2241 static __net_exit void nfsd_net_pre_exit(struct net *net)
2242 {
2243 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2244
2245 nfs_localio_invalidate_clients(&nn->local_clients,
2246 &nn->local_clients_lock);
2247 }
2248 #endif
2249
2250 /**
2251 * nfsd_net_exit - Release the nfsd_net portion of a net namespace
2252 * @net: a network namespace that is about to be destroyed
2253 *
2254 */
2255 static __net_exit void nfsd_net_exit(struct net *net)
2256 {
2257 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2258
2259 nfsd_proc_stat_shutdown(net);
2260 percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM);
2261 nfsd_idmap_shutdown(net);
2262 nfsd_export_shutdown(net);
2263 }
2264
2265 static struct pernet_operations nfsd_net_ops = {
2266 .init = nfsd_net_init,
2267 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2268 .pre_exit = nfsd_net_pre_exit,
2269 #endif
2270 .exit = nfsd_net_exit,
2271 .id = &nfsd_net_id,
2272 .size = sizeof(struct nfsd_net),
2273 };
2274
2275 static int __init init_nfsd(void)
2276 {
2277 int retval;
2278
2279 retval = nfsd4_init_slabs();
2280 if (retval)
2281 return retval;
2282 retval = nfsd4_init_pnfs();
2283 if (retval)
2284 goto out_free_slabs;
2285 retval = nfsd_drc_slab_create();
2286 if (retval)
2287 goto out_free_pnfs;
2288 nfsd_lockd_init(); /* lockd->nfsd callbacks */
2289 retval = create_proc_exports_entry();
2290 if (retval)
2291 goto out_free_lockd;
2292 retval = register_pernet_subsys(&nfsd_net_ops);
2293 if (retval < 0)
2294 goto out_free_exports;
2295 retval = register_cld_notifier();
2296 if (retval)
2297 goto out_free_subsys;
2298 retval = nfsd4_create_laundry_wq();
2299 if (retval)
2300 goto out_free_cld;
2301 retval = register_filesystem(&nfsd_fs_type);
2302 if (retval)
2303 goto out_free_all;
2304 retval = genl_register_family(&nfsd_nl_family);
2305 if (retval)
2306 goto out_free_all;
2307 nfsd_localio_ops_init();
2308
2309 return 0;
2310 out_free_all:
2311 nfsd4_destroy_laundry_wq();
2312 out_free_cld:
2313 unregister_cld_notifier();
2314 out_free_subsys:
2315 unregister_pernet_subsys(&nfsd_net_ops);
2316 out_free_exports:
2317 remove_proc_entry("fs/nfs/exports", NULL);
2318 remove_proc_entry("fs/nfs", NULL);
2319 out_free_lockd:
2320 nfsd_lockd_shutdown();
2321 nfsd_drc_slab_free();
2322 out_free_pnfs:
2323 nfsd4_exit_pnfs();
2324 out_free_slabs:
2325 nfsd4_free_slabs();
2326 return retval;
2327 }
2328
2329 static void __exit exit_nfsd(void)
2330 {
2331 genl_unregister_family(&nfsd_nl_family);
2332 unregister_filesystem(&nfsd_fs_type);
2333 nfsd4_destroy_laundry_wq();
2334 unregister_cld_notifier();
2335 unregister_pernet_subsys(&nfsd_net_ops);
2336 nfsd_drc_slab_free();
2337 remove_proc_entry("fs/nfs/exports", NULL);
2338 remove_proc_entry("fs/nfs", NULL);
2339 nfsd_lockd_shutdown();
2340 nfsd4_free_slabs();
2341 nfsd4_exit_pnfs();
2342 }
2343
2344 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2345 MODULE_DESCRIPTION("In-kernel NFS server");
2346 MODULE_LICENSE("GPL");
2347 module_init(init_nfsd)
2348 module_exit(exit_nfsd)
Linux Kernel