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Merge tag 'nfsd-6.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
[thirdparty/kernel/linux.git] / fs / nfsd / nfsctl.c
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 */
34 enum {
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 /*
52 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
53 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
54 */
55 #ifdef CONFIG_NFSD_V4
56 NFSD_Leasetime,
57 NFSD_Gracetime,
58 NFSD_RecoveryDir,
59 NFSD_V4EndGrace,
60 #endif
61 NFSD_MaxReserved
62 };
63
64 /*
65 * write() for these nodes.
66 */
67 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
68 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
69 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
70 static ssize_t write_threads(struct file *file, char *buf, size_t size);
71 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
72 static ssize_t write_versions(struct file *file, char *buf, size_t size);
73 static ssize_t write_ports(struct file *file, char *buf, size_t size);
74 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
75 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
76 #ifdef CONFIG_NFSD_V4
77 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
78 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
79 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
80 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
81 #endif
82
83 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
84 [NFSD_Fh] = write_filehandle,
85 [NFSD_FO_UnlockIP] = write_unlock_ip,
86 [NFSD_FO_UnlockFS] = write_unlock_fs,
87 [NFSD_Threads] = write_threads,
88 [NFSD_Pool_Threads] = write_pool_threads,
89 [NFSD_Versions] = write_versions,
90 [NFSD_Ports] = write_ports,
91 [NFSD_MaxBlkSize] = write_maxblksize,
92 [NFSD_MaxConnections] = write_maxconn,
93 #ifdef CONFIG_NFSD_V4
94 [NFSD_Leasetime] = write_leasetime,
95 [NFSD_Gracetime] = write_gracetime,
96 [NFSD_RecoveryDir] = write_recoverydir,
97 [NFSD_V4EndGrace] = write_v4_end_grace,
98 #endif
99 };
100
101 static 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
122 static 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
136 static 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
143 static 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
158 static 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
163 static 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
170 static 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
176 DEFINE_SHOW_ATTRIBUTE(export_features);
177
178 static const struct file_operations pool_stats_operations = {
179 .open = nfsd_pool_stats_open,
180 .read = seq_read,
181 .llseek = seq_lseek,
182 .release = nfsd_pool_stats_release,
183 };
184
185 DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
186
187 DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
188
189 /*----------------------------------------------------------------------------*/
190 /*
191 * payload - write methods
192 */
193
194 static inline struct net *netns(struct file *file)
195 {
196 return file_inode(file)->i_sb->s_fs_info;
197 }
198
199 /*
200 * write_unlock_ip - Release all locks used by a client
201 *
202 * Experimental.
203 *
204 * Input:
205 * buf: '\n'-terminated C string containing a
206 * presentation format IP address
207 * size: length of C string in @buf
208 * Output:
209 * On success: returns zero if all specified locks were released;
210 * returns one if one or more locks were not released
211 * On error: return code is negative errno value
212 */
213 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
214 {
215 struct sockaddr_storage address;
216 struct sockaddr *sap = (struct sockaddr *)&address;
217 size_t salen = sizeof(address);
218 char *fo_path;
219 struct net *net = netns(file);
220
221 /* sanity check */
222 if (size == 0)
223 return -EINVAL;
224
225 if (buf[size-1] != '\n')
226 return -EINVAL;
227
228 fo_path = buf;
229 if (qword_get(&buf, fo_path, size) < 0)
230 return -EINVAL;
231
232 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
233 return -EINVAL;
234
235 trace_nfsd_ctl_unlock_ip(net, buf);
236 return nlmsvc_unlock_all_by_ip(sap);
237 }
238
239 /*
240 * write_unlock_fs - Release all locks on a local file system
241 *
242 * Experimental.
243 *
244 * Input:
245 * buf: '\n'-terminated C string containing the
246 * absolute pathname of a local file system
247 * size: length of C string in @buf
248 * Output:
249 * On success: returns zero if all specified locks were released;
250 * returns one if one or more locks were not released
251 * On error: return code is negative errno value
252 */
253 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
254 {
255 struct path path;
256 char *fo_path;
257 int error;
258
259 /* sanity check */
260 if (size == 0)
261 return -EINVAL;
262
263 if (buf[size-1] != '\n')
264 return -EINVAL;
265
266 fo_path = buf;
267 if (qword_get(&buf, fo_path, size) < 0)
268 return -EINVAL;
269 trace_nfsd_ctl_unlock_fs(netns(file), fo_path);
270 error = kern_path(fo_path, 0, &path);
271 if (error)
272 return error;
273
274 /*
275 * XXX: Needs better sanity checking. Otherwise we could end up
276 * releasing locks on the wrong file system.
277 *
278 * For example:
279 * 1. Does the path refer to a directory?
280 * 2. Is that directory a mount point, or
281 * 3. Is that directory the root of an exported file system?
282 */
283 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
284
285 path_put(&path);
286 return error;
287 }
288
289 /*
290 * write_filehandle - Get a variable-length NFS file handle by path
291 *
292 * On input, the buffer contains a '\n'-terminated C string comprised of
293 * three alphanumeric words separated by whitespace. The string may
294 * contain escape sequences.
295 *
296 * Input:
297 * buf:
298 * domain: client domain name
299 * path: export pathname
300 * maxsize: numeric maximum size of
301 * @buf
302 * size: length of C string in @buf
303 * Output:
304 * On success: passed-in buffer filled with '\n'-terminated C
305 * string containing a ASCII hex text version
306 * of the NFS file handle;
307 * return code is the size in bytes of the string
308 * On error: return code is negative errno value
309 */
310 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
311 {
312 char *dname, *path;
313 int maxsize;
314 char *mesg = buf;
315 int len;
316 struct auth_domain *dom;
317 struct knfsd_fh fh;
318
319 if (size == 0)
320 return -EINVAL;
321
322 if (buf[size-1] != '\n')
323 return -EINVAL;
324 buf[size-1] = 0;
325
326 dname = mesg;
327 len = qword_get(&mesg, dname, size);
328 if (len <= 0)
329 return -EINVAL;
330
331 path = dname+len+1;
332 len = qword_get(&mesg, path, size);
333 if (len <= 0)
334 return -EINVAL;
335
336 len = get_int(&mesg, &maxsize);
337 if (len)
338 return len;
339
340 if (maxsize < NFS_FHSIZE)
341 return -EINVAL;
342 maxsize = min(maxsize, NFS3_FHSIZE);
343
344 if (qword_get(&mesg, mesg, size) > 0)
345 return -EINVAL;
346
347 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize);
348
349 /* we have all the words, they are in buf.. */
350 dom = unix_domain_find(dname);
351 if (!dom)
352 return -ENOMEM;
353
354 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
355 auth_domain_put(dom);
356 if (len)
357 return len;
358
359 mesg = buf;
360 len = SIMPLE_TRANSACTION_LIMIT;
361 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
362 mesg[-1] = '\n';
363 return mesg - buf;
364 }
365
366 /*
367 * write_threads - Start NFSD, or report the current number of running threads
368 *
369 * Input:
370 * buf: ignored
371 * size: zero
372 * Output:
373 * On success: passed-in buffer filled with '\n'-terminated C
374 * string numeric value representing the number of
375 * running NFSD threads;
376 * return code is the size in bytes of the string
377 * On error: return code is zero
378 *
379 * OR
380 *
381 * Input:
382 * buf: C string containing an unsigned
383 * integer value representing the
384 * number of NFSD threads to start
385 * size: non-zero length of C string in @buf
386 * Output:
387 * On success: NFS service is started;
388 * passed-in buffer filled with '\n'-terminated C
389 * string numeric value representing the number of
390 * running NFSD threads;
391 * return code is the size in bytes of the string
392 * On error: return code is zero or a negative errno value
393 */
394 static ssize_t write_threads(struct file *file, char *buf, size_t size)
395 {
396 char *mesg = buf;
397 int rv;
398 struct net *net = netns(file);
399
400 if (size > 0) {
401 int newthreads;
402 rv = get_int(&mesg, &newthreads);
403 if (rv)
404 return rv;
405 if (newthreads < 0)
406 return -EINVAL;
407 trace_nfsd_ctl_threads(net, newthreads);
408 rv = nfsd_svc(newthreads, net, file->f_cred);
409 if (rv < 0)
410 return rv;
411 } else
412 rv = nfsd_nrthreads(net);
413
414 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
415 }
416
417 /*
418 * write_pool_threads - Set or report the current number of threads per pool
419 *
420 * Input:
421 * buf: ignored
422 * size: zero
423 *
424 * OR
425 *
426 * Input:
427 * buf: C string containing whitespace-
428 * separated unsigned integer values
429 * representing the number of NFSD
430 * threads to start in each pool
431 * size: non-zero length of C string in @buf
432 * Output:
433 * On success: passed-in buffer filled with '\n'-terminated C
434 * string containing integer values representing the
435 * number of NFSD threads in each pool;
436 * return code is the size in bytes of the string
437 * On error: return code is zero or a negative errno value
438 */
439 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
440 {
441 /* if size > 0, look for an array of number of threads per node
442 * and apply them then write out number of threads per node as reply
443 */
444 char *mesg = buf;
445 int i;
446 int rv;
447 int len;
448 int npools;
449 int *nthreads;
450 struct net *net = netns(file);
451
452 mutex_lock(&nfsd_mutex);
453 npools = nfsd_nrpools(net);
454 if (npools == 0) {
455 /*
456 * NFS is shut down. The admin can start it by
457 * writing to the threads file but NOT the pool_threads
458 * file, sorry. Report zero threads.
459 */
460 mutex_unlock(&nfsd_mutex);
461 strcpy(buf, "0\n");
462 return strlen(buf);
463 }
464
465 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
466 rv = -ENOMEM;
467 if (nthreads == NULL)
468 goto out_free;
469
470 if (size > 0) {
471 for (i = 0; i < npools; i++) {
472 rv = get_int(&mesg, &nthreads[i]);
473 if (rv == -ENOENT)
474 break; /* fewer numbers than pools */
475 if (rv)
476 goto out_free; /* syntax error */
477 rv = -EINVAL;
478 if (nthreads[i] < 0)
479 goto out_free;
480 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]);
481 }
482 rv = nfsd_set_nrthreads(i, nthreads, net);
483 if (rv)
484 goto out_free;
485 }
486
487 rv = nfsd_get_nrthreads(npools, nthreads, net);
488 if (rv)
489 goto out_free;
490
491 mesg = buf;
492 size = SIMPLE_TRANSACTION_LIMIT;
493 for (i = 0; i < npools && size > 0; i++) {
494 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
495 len = strlen(mesg);
496 size -= len;
497 mesg += len;
498 }
499 rv = mesg - buf;
500 out_free:
501 kfree(nthreads);
502 mutex_unlock(&nfsd_mutex);
503 return rv;
504 }
505
506 static ssize_t
507 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
508 const char *sep, unsigned vers, int minor)
509 {
510 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
511 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
512
513 if (vers == 4 && minor >= 0 &&
514 !nfsd_minorversion(nn, minor, NFSD_TEST))
515 supported = false;
516 if (minor == 0 && supported)
517 /*
518 * special case for backward compatability.
519 * +4.0 is never reported, it is implied by
520 * +4, unless -4.0 is present.
521 */
522 return 0;
523 return snprintf(buf, remaining, format, sep,
524 supported ? '+' : '-', vers, minor);
525 }
526
527 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
528 {
529 char *mesg = buf;
530 char *vers, *minorp, sign;
531 int len, num, remaining;
532 ssize_t tlen = 0;
533 char *sep;
534 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
535
536 if (size > 0) {
537 if (nn->nfsd_serv)
538 /* Cannot change versions without updating
539 * nn->nfsd_serv->sv_xdrsize, and reallocing
540 * rq_argp and rq_resp
541 */
542 return -EBUSY;
543 if (buf[size-1] != '\n')
544 return -EINVAL;
545 buf[size-1] = 0;
546 trace_nfsd_ctl_version(netns(file), buf);
547
548 vers = mesg;
549 len = qword_get(&mesg, vers, size);
550 if (len <= 0) return -EINVAL;
551 do {
552 enum vers_op cmd;
553 unsigned minor;
554 sign = *vers;
555 if (sign == '+' || sign == '-')
556 num = simple_strtol((vers+1), &minorp, 0);
557 else
558 num = simple_strtol(vers, &minorp, 0);
559 if (*minorp == '.') {
560 if (num != 4)
561 return -EINVAL;
562 if (kstrtouint(minorp+1, 0, &minor) < 0)
563 return -EINVAL;
564 }
565
566 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
567 switch(num) {
568 #ifdef CONFIG_NFSD_V2
569 case 2:
570 #endif
571 case 3:
572 nfsd_vers(nn, num, cmd);
573 break;
574 case 4:
575 if (*minorp == '.') {
576 if (nfsd_minorversion(nn, minor, cmd) < 0)
577 return -EINVAL;
578 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
579 /*
580 * Either we have +4 and no minors are enabled,
581 * or we have -4 and at least one minor is enabled.
582 * In either case, propagate 'cmd' to all minors.
583 */
584 minor = 0;
585 while (nfsd_minorversion(nn, minor, cmd) >= 0)
586 minor++;
587 }
588 break;
589 default:
590 /* Ignore requests to disable non-existent versions */
591 if (cmd == NFSD_SET)
592 return -EINVAL;
593 }
594 vers += len + 1;
595 } while ((len = qword_get(&mesg, vers, size)) > 0);
596 /* If all get turned off, turn them back on, as
597 * having no versions is BAD
598 */
599 nfsd_reset_versions(nn);
600 }
601
602 /* Now write current state into reply buffer */
603 sep = "";
604 remaining = SIMPLE_TRANSACTION_LIMIT;
605 for (num=2 ; num <= 4 ; num++) {
606 int minor;
607 if (!nfsd_vers(nn, num, NFSD_AVAIL))
608 continue;
609
610 minor = -1;
611 do {
612 len = nfsd_print_version_support(nn, buf, remaining,
613 sep, num, minor);
614 if (len >= remaining)
615 goto out;
616 remaining -= len;
617 buf += len;
618 tlen += len;
619 minor++;
620 if (len)
621 sep = " ";
622 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
623 }
624 out:
625 len = snprintf(buf, remaining, "\n");
626 if (len >= remaining)
627 return -EINVAL;
628 return tlen + len;
629 }
630
631 /*
632 * write_versions - Set or report the available NFS protocol versions
633 *
634 * Input:
635 * buf: ignored
636 * size: zero
637 * Output:
638 * On success: passed-in buffer filled with '\n'-terminated C
639 * string containing positive or negative integer
640 * values representing the current status of each
641 * protocol version;
642 * return code is the size in bytes of the string
643 * On error: return code is zero or a negative errno value
644 *
645 * OR
646 *
647 * Input:
648 * buf: C string containing whitespace-
649 * separated positive or negative
650 * integer values representing NFS
651 * protocol versions to enable ("+n")
652 * or disable ("-n")
653 * size: non-zero length of C string in @buf
654 * Output:
655 * On success: status of zero or more protocol versions has
656 * been updated; passed-in buffer filled with
657 * '\n'-terminated C string containing positive
658 * or negative integer values representing the
659 * current status of each 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 static ssize_t write_versions(struct file *file, char *buf, size_t size)
664 {
665 ssize_t rv;
666
667 mutex_lock(&nfsd_mutex);
668 rv = __write_versions(file, buf, size);
669 mutex_unlock(&nfsd_mutex);
670 return rv;
671 }
672
673 /*
674 * Zero-length write. Return a list of NFSD's current listener
675 * transports.
676 */
677 static ssize_t __write_ports_names(char *buf, struct net *net)
678 {
679 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
680
681 if (nn->nfsd_serv == NULL)
682 return 0;
683 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
684 }
685
686 /*
687 * A single 'fd' number was written, in which case it must be for
688 * a socket of a supported family/protocol, and we use it as an
689 * nfsd listener.
690 */
691 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
692 {
693 char *mesg = buf;
694 int fd, err;
695 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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 err = svc_addsock(nn->nfsd_serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
707
708 if (err < 0 && !nn->nfsd_serv->sv_nrthreads && !nn->keep_active)
709 nfsd_last_thread(net);
710 else if (err >= 0 &&
711 !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
712 svc_get(nn->nfsd_serv);
713
714 nfsd_put(net);
715 return err;
716 }
717
718 /*
719 * A transport listener is added by writing its transport name and
720 * a port number.
721 */
722 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
723 {
724 char transport[16];
725 struct svc_xprt *xprt;
726 int port, err;
727 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
728
729 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
730 return -EINVAL;
731
732 if (port < 1 || port > USHRT_MAX)
733 return -EINVAL;
734 trace_nfsd_ctl_ports_addxprt(net, transport, port);
735
736 err = nfsd_create_serv(net);
737 if (err != 0)
738 return err;
739
740 err = svc_xprt_create(nn->nfsd_serv, transport, net,
741 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
742 if (err < 0)
743 goto out_err;
744
745 err = svc_xprt_create(nn->nfsd_serv, transport, net,
746 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
747 if (err < 0 && err != -EAFNOSUPPORT)
748 goto out_close;
749
750 if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
751 svc_get(nn->nfsd_serv);
752
753 nfsd_put(net);
754 return 0;
755 out_close:
756 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
757 if (xprt != NULL) {
758 svc_xprt_close(xprt);
759 svc_xprt_put(xprt);
760 }
761 out_err:
762 if (!nn->nfsd_serv->sv_nrthreads && !nn->keep_active)
763 nfsd_last_thread(net);
764
765 nfsd_put(net);
766 return err;
767 }
768
769 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
770 struct net *net)
771 {
772 if (size == 0)
773 return __write_ports_names(buf, net);
774
775 if (isdigit(buf[0]))
776 return __write_ports_addfd(buf, net, file->f_cred);
777
778 if (isalpha(buf[0]))
779 return __write_ports_addxprt(buf, net, file->f_cred);
780
781 return -EINVAL;
782 }
783
784 /*
785 * write_ports - Pass a socket file descriptor or transport name to listen on
786 *
787 * Input:
788 * buf: ignored
789 * size: zero
790 * Output:
791 * On success: passed-in buffer filled with a '\n'-terminated C
792 * string containing a whitespace-separated list of
793 * named NFSD listeners;
794 * return code is the size in bytes of the string
795 * On error: return code is zero or a negative errno value
796 *
797 * OR
798 *
799 * Input:
800 * buf: C string containing an unsigned
801 * integer value representing a bound
802 * but unconnected socket that is to be
803 * used as an NFSD listener; listen(3)
804 * must be called for a SOCK_STREAM
805 * socket, otherwise it is ignored
806 * size: non-zero length of C string in @buf
807 * Output:
808 * On success: NFS service is started;
809 * passed-in buffer filled with a '\n'-terminated C
810 * string containing a unique alphanumeric name of
811 * the listener;
812 * return code is the size in bytes of the string
813 * On error: return code is a negative errno value
814 *
815 * OR
816 *
817 * Input:
818 * buf: C string containing a transport
819 * name and an unsigned integer value
820 * representing the port to listen on,
821 * separated by whitespace
822 * size: non-zero length of C string in @buf
823 * Output:
824 * On success: returns zero; NFS service is started
825 * On error: return code is a negative errno value
826 */
827 static ssize_t write_ports(struct file *file, char *buf, size_t size)
828 {
829 ssize_t rv;
830
831 mutex_lock(&nfsd_mutex);
832 rv = __write_ports(file, buf, size, netns(file));
833 mutex_unlock(&nfsd_mutex);
834 return rv;
835 }
836
837
838 int nfsd_max_blksize;
839
840 /*
841 * write_maxblksize - Set or report the current NFS blksize
842 *
843 * Input:
844 * buf: ignored
845 * size: zero
846 *
847 * OR
848 *
849 * Input:
850 * buf: C string containing an unsigned
851 * integer value representing the new
852 * NFS blksize
853 * size: non-zero length of C string in @buf
854 * Output:
855 * On success: passed-in buffer filled with '\n'-terminated C string
856 * containing numeric value of the current NFS blksize
857 * setting;
858 * return code is the size in bytes of the string
859 * On error: return code is zero or a negative errno value
860 */
861 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
862 {
863 char *mesg = buf;
864 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
865
866 if (size > 0) {
867 int bsize;
868 int rv = get_int(&mesg, &bsize);
869 if (rv)
870 return rv;
871 trace_nfsd_ctl_maxblksize(netns(file), bsize);
872
873 /* force bsize into allowed range and
874 * required alignment.
875 */
876 bsize = max_t(int, bsize, 1024);
877 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
878 bsize &= ~(1024-1);
879 mutex_lock(&nfsd_mutex);
880 if (nn->nfsd_serv) {
881 mutex_unlock(&nfsd_mutex);
882 return -EBUSY;
883 }
884 nfsd_max_blksize = bsize;
885 mutex_unlock(&nfsd_mutex);
886 }
887
888 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
889 nfsd_max_blksize);
890 }
891
892 /*
893 * write_maxconn - Set or report the current max number of connections
894 *
895 * Input:
896 * buf: ignored
897 * size: zero
898 * OR
899 *
900 * Input:
901 * buf: C string containing an unsigned
902 * integer value representing the new
903 * number of max connections
904 * size: non-zero length of C string in @buf
905 * Output:
906 * On success: passed-in buffer filled with '\n'-terminated C string
907 * containing numeric value of max_connections setting
908 * for this net namespace;
909 * return code is the size in bytes of the string
910 * On error: return code is zero or a negative errno value
911 */
912 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
913 {
914 char *mesg = buf;
915 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
916 unsigned int maxconn = nn->max_connections;
917
918 if (size > 0) {
919 int rv = get_uint(&mesg, &maxconn);
920
921 if (rv)
922 return rv;
923 trace_nfsd_ctl_maxconn(netns(file), maxconn);
924 nn->max_connections = maxconn;
925 }
926
927 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
928 }
929
930 #ifdef CONFIG_NFSD_V4
931 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
932 time64_t *time, struct nfsd_net *nn)
933 {
934 struct dentry *dentry = file_dentry(file);
935 char *mesg = buf;
936 int rv, i;
937
938 if (size > 0) {
939 if (nn->nfsd_serv)
940 return -EBUSY;
941 rv = get_int(&mesg, &i);
942 if (rv)
943 return rv;
944 trace_nfsd_ctl_time(netns(file), dentry->d_name.name,
945 dentry->d_name.len, i);
946
947 /*
948 * Some sanity checking. We don't have a reason for
949 * these particular numbers, but problems with the
950 * extremes are:
951 * - Too short: the briefest network outage may
952 * cause clients to lose all their locks. Also,
953 * the frequent polling may be wasteful.
954 * - Too long: do you really want reboot recovery
955 * to take more than an hour? Or to make other
956 * clients wait an hour before being able to
957 * revoke a dead client's locks?
958 */
959 if (i < 10 || i > 3600)
960 return -EINVAL;
961 *time = i;
962 }
963
964 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
965 }
966
967 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
968 time64_t *time, struct nfsd_net *nn)
969 {
970 ssize_t rv;
971
972 mutex_lock(&nfsd_mutex);
973 rv = __nfsd4_write_time(file, buf, size, time, nn);
974 mutex_unlock(&nfsd_mutex);
975 return rv;
976 }
977
978 /*
979 * write_leasetime - Set or report the current NFSv4 lease time
980 *
981 * Input:
982 * buf: ignored
983 * size: zero
984 *
985 * OR
986 *
987 * Input:
988 * buf: C string containing an unsigned
989 * integer value representing the new
990 * NFSv4 lease expiry time
991 * size: non-zero length of C string in @buf
992 * Output:
993 * On success: passed-in buffer filled with '\n'-terminated C
994 * string containing unsigned integer value of the
995 * current lease expiry time;
996 * return code is the size in bytes of the string
997 * On error: return code is zero or a negative errno value
998 */
999 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1000 {
1001 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1002 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1003 }
1004
1005 /*
1006 * write_gracetime - Set or report current NFSv4 grace period time
1007 *
1008 * As above, but sets the time of the NFSv4 grace period.
1009 *
1010 * Note this should never be set to less than the *previous*
1011 * lease-period time, but we don't try to enforce this. (In the common
1012 * case (a new boot), we don't know what the previous lease time was
1013 * anyway.)
1014 */
1015 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1016 {
1017 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1018 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1019 }
1020
1021 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1022 struct nfsd_net *nn)
1023 {
1024 char *mesg = buf;
1025 char *recdir;
1026 int len, status;
1027
1028 if (size > 0) {
1029 if (nn->nfsd_serv)
1030 return -EBUSY;
1031 if (size > PATH_MAX || buf[size-1] != '\n')
1032 return -EINVAL;
1033 buf[size-1] = 0;
1034
1035 recdir = mesg;
1036 len = qword_get(&mesg, recdir, size);
1037 if (len <= 0)
1038 return -EINVAL;
1039 trace_nfsd_ctl_recoverydir(netns(file), recdir);
1040
1041 status = nfs4_reset_recoverydir(recdir);
1042 if (status)
1043 return status;
1044 }
1045
1046 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1047 nfs4_recoverydir());
1048 }
1049
1050 /*
1051 * write_recoverydir - Set or report the pathname of the recovery directory
1052 *
1053 * Input:
1054 * buf: ignored
1055 * size: zero
1056 *
1057 * OR
1058 *
1059 * Input:
1060 * buf: C string containing the pathname
1061 * of the directory on a local file
1062 * system containing permanent NFSv4
1063 * recovery data
1064 * size: non-zero length of C string in @buf
1065 * Output:
1066 * On success: passed-in buffer filled with '\n'-terminated C string
1067 * containing the current recovery pathname setting;
1068 * return code is the size in bytes of the string
1069 * On error: return code is zero or a negative errno value
1070 */
1071 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1072 {
1073 ssize_t rv;
1074 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1075
1076 mutex_lock(&nfsd_mutex);
1077 rv = __write_recoverydir(file, buf, size, nn);
1078 mutex_unlock(&nfsd_mutex);
1079 return rv;
1080 }
1081
1082 /*
1083 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1084 *
1085 * Input:
1086 * buf: ignored
1087 * size: zero
1088 * OR
1089 *
1090 * Input:
1091 * buf: any value
1092 * size: non-zero length of C string in @buf
1093 * Output:
1094 * passed-in buffer filled with "Y" or "N" with a newline
1095 * and NULL-terminated C string. This indicates whether
1096 * the grace period has ended in the current net
1097 * namespace. Return code is the size in bytes of the
1098 * string. Writing a string that starts with 'Y', 'y', or
1099 * '1' to the file will end the grace period for nfsd's v4
1100 * lock manager.
1101 */
1102 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1103 {
1104 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1105
1106 if (size > 0) {
1107 switch(buf[0]) {
1108 case 'Y':
1109 case 'y':
1110 case '1':
1111 if (!nn->nfsd_serv)
1112 return -EBUSY;
1113 trace_nfsd_end_grace(netns(file));
1114 nfsd4_end_grace(nn);
1115 break;
1116 default:
1117 return -EINVAL;
1118 }
1119 }
1120
1121 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1122 nn->grace_ended ? 'Y' : 'N');
1123 }
1124
1125 #endif
1126
1127 /*----------------------------------------------------------------------------*/
1128 /*
1129 * populating the filesystem.
1130 */
1131
1132 /* Basically copying rpc_get_inode. */
1133 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1134 {
1135 struct inode *inode = new_inode(sb);
1136 if (!inode)
1137 return NULL;
1138 /* Following advice from simple_fill_super documentation: */
1139 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1140 inode->i_mode = mode;
1141 simple_inode_init_ts(inode);
1142 switch (mode & S_IFMT) {
1143 case S_IFDIR:
1144 inode->i_fop = &simple_dir_operations;
1145 inode->i_op = &simple_dir_inode_operations;
1146 inc_nlink(inode);
1147 break;
1148 case S_IFLNK:
1149 inode->i_op = &simple_symlink_inode_operations;
1150 break;
1151 default:
1152 break;
1153 }
1154 return inode;
1155 }
1156
1157 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1158 {
1159 struct inode *inode;
1160
1161 inode = nfsd_get_inode(dir->i_sb, mode);
1162 if (!inode)
1163 return -ENOMEM;
1164 if (ncl) {
1165 inode->i_private = ncl;
1166 kref_get(&ncl->cl_ref);
1167 }
1168 d_add(dentry, inode);
1169 inc_nlink(dir);
1170 fsnotify_mkdir(dir, dentry);
1171 return 0;
1172 }
1173
1174 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1175 {
1176 struct inode *dir = parent->d_inode;
1177 struct dentry *dentry;
1178 int ret = -ENOMEM;
1179
1180 inode_lock(dir);
1181 dentry = d_alloc_name(parent, name);
1182 if (!dentry)
1183 goto out_err;
1184 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1185 if (ret)
1186 goto out_err;
1187 out:
1188 inode_unlock(dir);
1189 return dentry;
1190 out_err:
1191 dput(dentry);
1192 dentry = ERR_PTR(ret);
1193 goto out;
1194 }
1195
1196 #if IS_ENABLED(CONFIG_SUNRPC_GSS)
1197 static int __nfsd_symlink(struct inode *dir, struct dentry *dentry,
1198 umode_t mode, const char *content)
1199 {
1200 struct inode *inode;
1201
1202 inode = nfsd_get_inode(dir->i_sb, mode);
1203 if (!inode)
1204 return -ENOMEM;
1205
1206 inode->i_link = (char *)content;
1207 inode->i_size = strlen(content);
1208
1209 d_add(dentry, inode);
1210 inc_nlink(dir);
1211 fsnotify_create(dir, dentry);
1212 return 0;
1213 }
1214
1215 /*
1216 * @content is assumed to be a NUL-terminated string that lives
1217 * longer than the symlink itself.
1218 */
1219 static void _nfsd_symlink(struct dentry *parent, const char *name,
1220 const char *content)
1221 {
1222 struct inode *dir = parent->d_inode;
1223 struct dentry *dentry;
1224 int ret;
1225
1226 inode_lock(dir);
1227 dentry = d_alloc_name(parent, name);
1228 if (!dentry)
1229 goto out;
1230 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content);
1231 if (ret)
1232 dput(dentry);
1233 out:
1234 inode_unlock(dir);
1235 }
1236 #else
1237 static inline void _nfsd_symlink(struct dentry *parent, const char *name,
1238 const char *content)
1239 {
1240 }
1241
1242 #endif
1243
1244 static void clear_ncl(struct inode *inode)
1245 {
1246 struct nfsdfs_client *ncl = inode->i_private;
1247
1248 inode->i_private = NULL;
1249 kref_put(&ncl->cl_ref, ncl->cl_release);
1250 }
1251
1252 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
1253 {
1254 struct nfsdfs_client *nc = inode->i_private;
1255
1256 if (nc)
1257 kref_get(&nc->cl_ref);
1258 return nc;
1259 }
1260
1261 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1262 {
1263 struct nfsdfs_client *nc;
1264
1265 inode_lock_shared(inode);
1266 nc = __get_nfsdfs_client(inode);
1267 inode_unlock_shared(inode);
1268 return nc;
1269 }
1270 /* from __rpc_unlink */
1271 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
1272 {
1273 int ret;
1274
1275 clear_ncl(d_inode(dentry));
1276 dget(dentry);
1277 ret = simple_unlink(dir, dentry);
1278 d_drop(dentry);
1279 fsnotify_unlink(dir, dentry);
1280 dput(dentry);
1281 WARN_ON_ONCE(ret);
1282 }
1283
1284 static void nfsdfs_remove_files(struct dentry *root)
1285 {
1286 struct dentry *dentry, *tmp;
1287
1288 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
1289 if (!simple_positive(dentry)) {
1290 WARN_ON_ONCE(1); /* I think this can't happen? */
1291 continue;
1292 }
1293 nfsdfs_remove_file(d_inode(root), dentry);
1294 }
1295 }
1296
1297 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1298 * code instead. */
1299 static int nfsdfs_create_files(struct dentry *root,
1300 const struct tree_descr *files,
1301 struct dentry **fdentries)
1302 {
1303 struct inode *dir = d_inode(root);
1304 struct inode *inode;
1305 struct dentry *dentry;
1306 int i;
1307
1308 inode_lock(dir);
1309 for (i = 0; files->name && files->name[0]; i++, files++) {
1310 dentry = d_alloc_name(root, files->name);
1311 if (!dentry)
1312 goto out;
1313 inode = nfsd_get_inode(d_inode(root)->i_sb,
1314 S_IFREG | files->mode);
1315 if (!inode) {
1316 dput(dentry);
1317 goto out;
1318 }
1319 inode->i_fop = files->ops;
1320 inode->i_private = __get_nfsdfs_client(dir);
1321 d_add(dentry, inode);
1322 fsnotify_create(dir, dentry);
1323 if (fdentries)
1324 fdentries[i] = dentry;
1325 }
1326 inode_unlock(dir);
1327 return 0;
1328 out:
1329 nfsdfs_remove_files(root);
1330 inode_unlock(dir);
1331 return -ENOMEM;
1332 }
1333
1334 /* on success, returns positive number unique to that client. */
1335 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1336 struct nfsdfs_client *ncl, u32 id,
1337 const struct tree_descr *files,
1338 struct dentry **fdentries)
1339 {
1340 struct dentry *dentry;
1341 char name[11];
1342 int ret;
1343
1344 sprintf(name, "%u", id);
1345
1346 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1347 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1348 return NULL;
1349 ret = nfsdfs_create_files(dentry, files, fdentries);
1350 if (ret) {
1351 nfsd_client_rmdir(dentry);
1352 return NULL;
1353 }
1354 return dentry;
1355 }
1356
1357 /* Taken from __rpc_rmdir: */
1358 void nfsd_client_rmdir(struct dentry *dentry)
1359 {
1360 struct inode *dir = d_inode(dentry->d_parent);
1361 struct inode *inode = d_inode(dentry);
1362 int ret;
1363
1364 inode_lock(dir);
1365 nfsdfs_remove_files(dentry);
1366 clear_ncl(inode);
1367 dget(dentry);
1368 ret = simple_rmdir(dir, dentry);
1369 WARN_ON_ONCE(ret);
1370 d_drop(dentry);
1371 fsnotify_rmdir(dir, dentry);
1372 dput(dentry);
1373 inode_unlock(dir);
1374 }
1375
1376 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1377 {
1378 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1379 nfsd_net_id);
1380 struct dentry *dentry;
1381 int ret;
1382
1383 static const struct tree_descr nfsd_files[] = {
1384 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1385 /* Per-export io stats use same ops as exports file */
1386 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1387 [NFSD_Export_features] = {"export_features",
1388 &export_features_fops, S_IRUGO},
1389 [NFSD_FO_UnlockIP] = {"unlock_ip",
1390 &transaction_ops, S_IWUSR|S_IRUSR},
1391 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1392 &transaction_ops, S_IWUSR|S_IRUSR},
1393 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1394 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1395 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1396 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1397 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1398 &nfsd_reply_cache_stats_fops, S_IRUGO},
1399 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1400 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1401 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1402 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1403 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1404 #ifdef CONFIG_NFSD_V4
1405 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1406 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1407 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1408 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1409 #endif
1410 /* last one */ {""}
1411 };
1412
1413 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1414 if (ret)
1415 return ret;
1416 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes",
1417 "/proc/net/rpc/gss_krb5_enctypes");
1418 dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1419 if (IS_ERR(dentry))
1420 return PTR_ERR(dentry);
1421 nn->nfsd_client_dir = dentry;
1422 return 0;
1423 }
1424
1425 static int nfsd_fs_get_tree(struct fs_context *fc)
1426 {
1427 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1428 }
1429
1430 static void nfsd_fs_free_fc(struct fs_context *fc)
1431 {
1432 if (fc->s_fs_info)
1433 put_net(fc->s_fs_info);
1434 }
1435
1436 static const struct fs_context_operations nfsd_fs_context_ops = {
1437 .free = nfsd_fs_free_fc,
1438 .get_tree = nfsd_fs_get_tree,
1439 };
1440
1441 static int nfsd_init_fs_context(struct fs_context *fc)
1442 {
1443 put_user_ns(fc->user_ns);
1444 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1445 fc->ops = &nfsd_fs_context_ops;
1446 return 0;
1447 }
1448
1449 static void nfsd_umount(struct super_block *sb)
1450 {
1451 struct net *net = sb->s_fs_info;
1452
1453 nfsd_shutdown_threads(net);
1454
1455 kill_litter_super(sb);
1456 put_net(net);
1457 }
1458
1459 static struct file_system_type nfsd_fs_type = {
1460 .owner = THIS_MODULE,
1461 .name = "nfsd",
1462 .init_fs_context = nfsd_init_fs_context,
1463 .kill_sb = nfsd_umount,
1464 };
1465 MODULE_ALIAS_FS("nfsd");
1466
1467 #ifdef CONFIG_PROC_FS
1468
1469 static int exports_proc_open(struct inode *inode, struct file *file)
1470 {
1471 return exports_net_open(current->nsproxy->net_ns, file);
1472 }
1473
1474 static const struct proc_ops exports_proc_ops = {
1475 .proc_open = exports_proc_open,
1476 .proc_read = seq_read,
1477 .proc_lseek = seq_lseek,
1478 .proc_release = seq_release,
1479 };
1480
1481 static int create_proc_exports_entry(void)
1482 {
1483 struct proc_dir_entry *entry;
1484
1485 entry = proc_mkdir("fs/nfs", NULL);
1486 if (!entry)
1487 return -ENOMEM;
1488 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1489 if (!entry) {
1490 remove_proc_entry("fs/nfs", NULL);
1491 return -ENOMEM;
1492 }
1493 return 0;
1494 }
1495 #else /* CONFIG_PROC_FS */
1496 static int create_proc_exports_entry(void)
1497 {
1498 return 0;
1499 }
1500 #endif
1501
1502 unsigned int nfsd_net_id;
1503
1504 /**
1505 * nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit
1506 * @cb: netlink metadata and command arguments
1507 *
1508 * Return values:
1509 * %0: The rpc_status_get command may proceed
1510 * %-ENODEV: There is no NFSD running in this namespace
1511 */
1512 int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
1513 {
1514 struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id);
1515 int ret = -ENODEV;
1516
1517 mutex_lock(&nfsd_mutex);
1518 if (nn->nfsd_serv)
1519 ret = 0;
1520 else
1521 mutex_unlock(&nfsd_mutex);
1522
1523 return ret;
1524 }
1525
1526 static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
1527 struct netlink_callback *cb,
1528 struct nfsd_genl_rqstp *rqstp)
1529 {
1530 void *hdr;
1531 u32 i;
1532
1533 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1534 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET);
1535 if (!hdr)
1536 return -ENOBUFS;
1537
1538 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) ||
1539 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) ||
1540 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) ||
1541 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) ||
1542 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) ||
1543 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME,
1544 ktime_to_us(rqstp->rq_stime),
1545 NFSD_A_RPC_STATUS_PAD))
1546 return -ENOBUFS;
1547
1548 switch (rqstp->rq_saddr.sa_family) {
1549 case AF_INET: {
1550 const struct sockaddr_in *s_in, *d_in;
1551
1552 s_in = (const struct sockaddr_in *)&rqstp->rq_saddr;
1553 d_in = (const struct sockaddr_in *)&rqstp->rq_daddr;
1554 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4,
1555 s_in->sin_addr.s_addr) ||
1556 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4,
1557 d_in->sin_addr.s_addr) ||
1558 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1559 s_in->sin_port) ||
1560 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1561 d_in->sin_port))
1562 return -ENOBUFS;
1563 break;
1564 }
1565 case AF_INET6: {
1566 const struct sockaddr_in6 *s_in, *d_in;
1567
1568 s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr;
1569 d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr;
1570 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6,
1571 &s_in->sin6_addr) ||
1572 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6,
1573 &d_in->sin6_addr) ||
1574 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1575 s_in->sin6_port) ||
1576 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1577 d_in->sin6_port))
1578 return -ENOBUFS;
1579 break;
1580 }
1581 }
1582
1583 for (i = 0; i < rqstp->rq_opcnt; i++)
1584 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS,
1585 rqstp->rq_opnum[i]))
1586 return -ENOBUFS;
1587
1588 genlmsg_end(skb, hdr);
1589 return 0;
1590 }
1591
1592 /**
1593 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit
1594 * @skb: reply buffer
1595 * @cb: netlink metadata and command arguments
1596 *
1597 * Returns the size of the reply or a negative errno.
1598 */
1599 int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
1600 struct netlink_callback *cb)
1601 {
1602 struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id);
1603 int i, ret, rqstp_index = 0;
1604
1605 rcu_read_lock();
1606
1607 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
1608 struct svc_rqst *rqstp;
1609
1610 if (i < cb->args[0]) /* already consumed */
1611 continue;
1612
1613 rqstp_index = 0;
1614 list_for_each_entry_rcu(rqstp,
1615 &nn->nfsd_serv->sv_pools[i].sp_all_threads,
1616 rq_all) {
1617 struct nfsd_genl_rqstp genl_rqstp;
1618 unsigned int status_counter;
1619
1620 if (rqstp_index++ < cb->args[1]) /* already consumed */
1621 continue;
1622 /*
1623 * Acquire rq_status_counter before parsing the rqst
1624 * fields. rq_status_counter is set to an odd value in
1625 * order to notify the consumers the rqstp fields are
1626 * meaningful.
1627 */
1628 status_counter =
1629 smp_load_acquire(&rqstp->rq_status_counter);
1630 if (!(status_counter & 1))
1631 continue;
1632
1633 genl_rqstp.rq_xid = rqstp->rq_xid;
1634 genl_rqstp.rq_flags = rqstp->rq_flags;
1635 genl_rqstp.rq_vers = rqstp->rq_vers;
1636 genl_rqstp.rq_prog = rqstp->rq_prog;
1637 genl_rqstp.rq_proc = rqstp->rq_proc;
1638 genl_rqstp.rq_stime = rqstp->rq_stime;
1639 genl_rqstp.rq_opcnt = 0;
1640 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
1641 sizeof(struct sockaddr));
1642 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
1643 sizeof(struct sockaddr));
1644
1645 #ifdef CONFIG_NFSD_V4
1646 if (rqstp->rq_vers == NFS4_VERSION &&
1647 rqstp->rq_proc == NFSPROC4_COMPOUND) {
1648 /* NFSv4 compound */
1649 struct nfsd4_compoundargs *args;
1650 int j;
1651
1652 args = rqstp->rq_argp;
1653 genl_rqstp.rq_opcnt = args->opcnt;
1654 for (j = 0; j < genl_rqstp.rq_opcnt; j++)
1655 genl_rqstp.rq_opnum[j] =
1656 args->ops[j].opnum;
1657 }
1658 #endif /* CONFIG_NFSD_V4 */
1659
1660 /*
1661 * Acquire rq_status_counter before reporting the rqst
1662 * fields to the user.
1663 */
1664 if (smp_load_acquire(&rqstp->rq_status_counter) !=
1665 status_counter)
1666 continue;
1667
1668 ret = nfsd_genl_rpc_status_compose_msg(skb, cb,
1669 &genl_rqstp);
1670 if (ret)
1671 goto out;
1672 }
1673 }
1674
1675 cb->args[0] = i;
1676 cb->args[1] = rqstp_index;
1677 ret = skb->len;
1678 out:
1679 rcu_read_unlock();
1680
1681 return ret;
1682 }
1683
1684 /**
1685 * nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing
1686 * @cb: netlink metadata and command arguments
1687 *
1688 * Return values:
1689 * %0: Success
1690 */
1691 int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
1692 {
1693 mutex_unlock(&nfsd_mutex);
1694
1695 return 0;
1696 }
1697
1698 /**
1699 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
1700 * @net: a freshly-created network namespace
1701 *
1702 * This information stays around as long as the network namespace is
1703 * alive whether or not there is an NFSD instance running in the
1704 * namespace.
1705 *
1706 * Returns zero on success, or a negative errno otherwise.
1707 */
1708 static __net_init int nfsd_net_init(struct net *net)
1709 {
1710 int retval;
1711 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1712
1713 retval = nfsd_export_init(net);
1714 if (retval)
1715 goto out_export_error;
1716 retval = nfsd_idmap_init(net);
1717 if (retval)
1718 goto out_idmap_error;
1719 retval = nfsd_net_reply_cache_init(nn);
1720 if (retval)
1721 goto out_repcache_error;
1722 nn->nfsd_versions = NULL;
1723 nn->nfsd4_minorversions = NULL;
1724 nfsd4_init_leases_net(nn);
1725 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
1726 seqlock_init(&nn->writeverf_lock);
1727
1728 return 0;
1729
1730 out_repcache_error:
1731 nfsd_idmap_shutdown(net);
1732 out_idmap_error:
1733 nfsd_export_shutdown(net);
1734 out_export_error:
1735 return retval;
1736 }
1737
1738 /**
1739 * nfsd_net_exit - Release the nfsd_net portion of a net namespace
1740 * @net: a network namespace that is about to be destroyed
1741 *
1742 */
1743 static __net_exit void nfsd_net_exit(struct net *net)
1744 {
1745 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1746
1747 nfsd_net_reply_cache_destroy(nn);
1748 nfsd_idmap_shutdown(net);
1749 nfsd_export_shutdown(net);
1750 nfsd_netns_free_versions(nn);
1751 }
1752
1753 static struct pernet_operations nfsd_net_ops = {
1754 .init = nfsd_net_init,
1755 .exit = nfsd_net_exit,
1756 .id = &nfsd_net_id,
1757 .size = sizeof(struct nfsd_net),
1758 };
1759
1760 static int __init init_nfsd(void)
1761 {
1762 int retval;
1763
1764 retval = nfsd4_init_slabs();
1765 if (retval)
1766 return retval;
1767 retval = nfsd4_init_pnfs();
1768 if (retval)
1769 goto out_free_slabs;
1770 retval = nfsd_stat_init(); /* Statistics */
1771 if (retval)
1772 goto out_free_pnfs;
1773 retval = nfsd_drc_slab_create();
1774 if (retval)
1775 goto out_free_stat;
1776 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1777 retval = create_proc_exports_entry();
1778 if (retval)
1779 goto out_free_lockd;
1780 retval = register_pernet_subsys(&nfsd_net_ops);
1781 if (retval < 0)
1782 goto out_free_exports;
1783 retval = register_cld_notifier();
1784 if (retval)
1785 goto out_free_subsys;
1786 retval = nfsd4_create_laundry_wq();
1787 if (retval)
1788 goto out_free_cld;
1789 retval = register_filesystem(&nfsd_fs_type);
1790 if (retval)
1791 goto out_free_all;
1792 retval = genl_register_family(&nfsd_nl_family);
1793 if (retval)
1794 goto out_free_all;
1795
1796 return 0;
1797 out_free_all:
1798 nfsd4_destroy_laundry_wq();
1799 out_free_cld:
1800 unregister_cld_notifier();
1801 out_free_subsys:
1802 unregister_pernet_subsys(&nfsd_net_ops);
1803 out_free_exports:
1804 remove_proc_entry("fs/nfs/exports", NULL);
1805 remove_proc_entry("fs/nfs", NULL);
1806 out_free_lockd:
1807 nfsd_lockd_shutdown();
1808 nfsd_drc_slab_free();
1809 out_free_stat:
1810 nfsd_stat_shutdown();
1811 out_free_pnfs:
1812 nfsd4_exit_pnfs();
1813 out_free_slabs:
1814 nfsd4_free_slabs();
1815 return retval;
1816 }
1817
1818 static void __exit exit_nfsd(void)
1819 {
1820 genl_unregister_family(&nfsd_nl_family);
1821 unregister_filesystem(&nfsd_fs_type);
1822 nfsd4_destroy_laundry_wq();
1823 unregister_cld_notifier();
1824 unregister_pernet_subsys(&nfsd_net_ops);
1825 nfsd_drc_slab_free();
1826 remove_proc_entry("fs/nfs/exports", NULL);
1827 remove_proc_entry("fs/nfs", NULL);
1828 nfsd_stat_shutdown();
1829 nfsd_lockd_shutdown();
1830 nfsd4_free_slabs();
1831 nfsd4_exit_pnfs();
1832 }
1833
1834 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1835 MODULE_DESCRIPTION("In-kernel NFS server");
1836 MODULE_LICENSE("GPL");
1837 module_init(init_nfsd)
1838 module_exit(exit_nfsd)
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