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
nfsctl_transaction_write(struct file * file,const char __user * buf,size_t size,loff_t * pos)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
nfsctl_transaction_read(struct file * file,char __user * buf,size_t size,loff_t * pos)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
exports_net_open(struct net * net,struct file * file)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
exports_nfsd_open(struct inode * inode,struct file * file)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
export_features_show(struct seq_file * m,void * v)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
nfsd_pool_stats_open(struct inode * inode,struct file * file)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
netns(struct file * file)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 */
write_unlock_ip(struct file * file,char * buf,size_t size)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 */
write_unlock_fs(struct file * file,char * buf,size_t size)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 struct nfsd_net *nn;
263
264 /* sanity check */
265 if (size == 0)
266 return -EINVAL;
267
268 if (buf[size-1] != '\n')
269 return -EINVAL;
270
271 fo_path = buf;
272 if (qword_get(&buf, fo_path, size) < 0)
273 return -EINVAL;
274 trace_nfsd_ctl_unlock_fs(netns(file), fo_path);
275 error = kern_path(fo_path, 0, &path);
276 if (error)
277 return error;
278
279 /*
280 * XXX: Needs better sanity checking. Otherwise we could end up
281 * releasing locks on the wrong file system.
282 *
283 * For example:
284 * 1. Does the path refer to a directory?
285 * 2. Is that directory a mount point, or
286 * 3. Is that directory the root of an exported file system?
287 */
288 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
289 mutex_lock(&nfsd_mutex);
290 nn = net_generic(netns(file), nfsd_net_id);
291 if (nn->nfsd_serv)
292 nfsd4_revoke_states(nn, path.dentry->d_sb);
293 else
294 error = -EINVAL;
295 mutex_unlock(&nfsd_mutex);
296
297 path_put(&path);
298 return error;
299 }
300
301 /*
302 * write_filehandle - Get a variable-length NFS file handle by path
303 *
304 * On input, the buffer contains a '\n'-terminated C string comprised of
305 * three alphanumeric words separated by whitespace. The string may
306 * contain escape sequences.
307 *
308 * Input:
309 * buf:
310 * domain: client domain name
311 * path: export pathname
312 * maxsize: numeric maximum size of
313 * @buf
314 * size: length of C string in @buf
315 * Output:
316 * On success: passed-in buffer filled with '\n'-terminated C
317 * string containing a ASCII hex text version
318 * of the NFS file handle;
319 * return code is the size in bytes of the string
320 * On error: return code is negative errno value
321 */
write_filehandle(struct file * file,char * buf,size_t size)322 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
323 {
324 char *dname, *path;
325 int maxsize;
326 char *mesg = buf;
327 int len;
328 struct auth_domain *dom;
329 struct knfsd_fh fh;
330
331 if (size == 0)
332 return -EINVAL;
333
334 if (buf[size-1] != '\n')
335 return -EINVAL;
336 buf[size-1] = 0;
337
338 dname = mesg;
339 len = qword_get(&mesg, dname, size);
340 if (len <= 0)
341 return -EINVAL;
342
343 path = dname+len+1;
344 len = qword_get(&mesg, path, size);
345 if (len <= 0)
346 return -EINVAL;
347
348 len = get_int(&mesg, &maxsize);
349 if (len)
350 return len;
351
352 if (maxsize < NFS_FHSIZE)
353 return -EINVAL;
354 maxsize = min(maxsize, NFS3_FHSIZE);
355
356 if (qword_get(&mesg, mesg, size) > 0)
357 return -EINVAL;
358
359 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize);
360
361 /* we have all the words, they are in buf.. */
362 dom = unix_domain_find(dname);
363 if (!dom)
364 return -ENOMEM;
365
366 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
367 auth_domain_put(dom);
368 if (len)
369 return len;
370
371 mesg = buf;
372 len = SIMPLE_TRANSACTION_LIMIT;
373 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
374 mesg[-1] = '\n';
375 return mesg - buf;
376 }
377
378 /*
379 * write_threads - Start NFSD, or report the current number of running threads
380 *
381 * Input:
382 * buf: ignored
383 * size: zero
384 * Output:
385 * On success: passed-in buffer filled with '\n'-terminated C
386 * string numeric value representing the number of
387 * running NFSD threads;
388 * return code is the size in bytes of the string
389 * On error: return code is zero
390 *
391 * OR
392 *
393 * Input:
394 * buf: C string containing an unsigned
395 * integer value representing the
396 * number of NFSD threads to start
397 * size: non-zero length of C string in @buf
398 * Output:
399 * On success: NFS service is started;
400 * passed-in buffer filled with '\n'-terminated C
401 * string numeric value representing the number of
402 * running NFSD threads;
403 * return code is the size in bytes of the string
404 * On error: return code is zero or a negative errno value
405 */
write_threads(struct file * file,char * buf,size_t size)406 static ssize_t write_threads(struct file *file, char *buf, size_t size)
407 {
408 char *mesg = buf;
409 int rv;
410 struct net *net = netns(file);
411
412 if (size > 0) {
413 int newthreads;
414 rv = get_int(&mesg, &newthreads);
415 if (rv)
416 return rv;
417 if (newthreads < 0)
418 return -EINVAL;
419 trace_nfsd_ctl_threads(net, newthreads);
420 mutex_lock(&nfsd_mutex);
421 rv = nfsd_svc(1, &newthreads, net, file->f_cred, NULL);
422 mutex_unlock(&nfsd_mutex);
423 if (rv < 0)
424 return rv;
425 } else
426 rv = nfsd_nrthreads(net);
427
428 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
429 }
430
431 /*
432 * write_pool_threads - Set or report the current number of threads per pool
433 *
434 * Input:
435 * buf: ignored
436 * size: zero
437 *
438 * OR
439 *
440 * Input:
441 * buf: C string containing whitespace-
442 * separated unsigned integer values
443 * representing the number of NFSD
444 * threads to start in each pool
445 * size: non-zero length of C string in @buf
446 * Output:
447 * On success: passed-in buffer filled with '\n'-terminated C
448 * string containing integer values representing the
449 * number of NFSD threads in each pool;
450 * return code is the size in bytes of the string
451 * On error: return code is zero or a negative errno value
452 */
write_pool_threads(struct file * file,char * buf,size_t size)453 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
454 {
455 /* if size > 0, look for an array of number of threads per node
456 * and apply them then write out number of threads per node as reply
457 */
458 char *mesg = buf;
459 int i;
460 int rv;
461 int len;
462 int npools;
463 int *nthreads;
464 struct net *net = netns(file);
465
466 mutex_lock(&nfsd_mutex);
467 npools = nfsd_nrpools(net);
468 if (npools == 0) {
469 /*
470 * NFS is shut down. The admin can start it by
471 * writing to the threads file but NOT the pool_threads
472 * file, sorry. Report zero threads.
473 */
474 mutex_unlock(&nfsd_mutex);
475 strcpy(buf, "0\n");
476 return strlen(buf);
477 }
478
479 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
480 rv = -ENOMEM;
481 if (nthreads == NULL)
482 goto out_free;
483
484 if (size > 0) {
485 for (i = 0; i < npools; i++) {
486 rv = get_int(&mesg, &nthreads[i]);
487 if (rv == -ENOENT)
488 break; /* fewer numbers than pools */
489 if (rv)
490 goto out_free; /* syntax error */
491 rv = -EINVAL;
492 if (nthreads[i] < 0)
493 goto out_free;
494 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]);
495 }
496
497 /*
498 * There must always be a thread in pool 0; the admin
499 * can't shut down NFS completely using pool_threads.
500 */
501 if (nthreads[0] == 0)
502 nthreads[0] = 1;
503
504 rv = nfsd_set_nrthreads(i, nthreads, net);
505 if (rv)
506 goto out_free;
507 }
508
509 rv = nfsd_get_nrthreads(npools, nthreads, net);
510 if (rv)
511 goto out_free;
512
513 mesg = buf;
514 size = SIMPLE_TRANSACTION_LIMIT;
515 for (i = 0; i < npools && size > 0; i++) {
516 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
517 len = strlen(mesg);
518 size -= len;
519 mesg += len;
520 }
521 rv = mesg - buf;
522 out_free:
523 kfree(nthreads);
524 mutex_unlock(&nfsd_mutex);
525 return rv;
526 }
527
528 static ssize_t
nfsd_print_version_support(struct nfsd_net * nn,char * buf,int remaining,const char * sep,unsigned vers,int minor)529 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
530 const char *sep, unsigned vers, int minor)
531 {
532 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
533 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
534
535 if (vers == 4 && minor >= 0 &&
536 !nfsd_minorversion(nn, minor, NFSD_TEST))
537 supported = false;
538 if (minor == 0 && supported)
539 /*
540 * special case for backward compatability.
541 * +4.0 is never reported, it is implied by
542 * +4, unless -4.0 is present.
543 */
544 return 0;
545 return snprintf(buf, remaining, format, sep,
546 supported ? '+' : '-', vers, minor);
547 }
548
__write_versions(struct file * file,char * buf,size_t size)549 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
550 {
551 char *mesg = buf;
552 char *vers, *minorp, sign;
553 int len, num, remaining;
554 ssize_t tlen = 0;
555 char *sep;
556 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
557
558 if (size > 0) {
559 if (nn->nfsd_serv)
560 /* Cannot change versions without updating
561 * nn->nfsd_serv->sv_xdrsize, and reallocing
562 * rq_argp and rq_resp
563 */
564 return -EBUSY;
565 if (buf[size-1] != '\n')
566 return -EINVAL;
567 buf[size-1] = 0;
568 trace_nfsd_ctl_version(netns(file), buf);
569
570 vers = mesg;
571 len = qword_get(&mesg, vers, size);
572 if (len <= 0) return -EINVAL;
573 do {
574 enum vers_op cmd;
575 unsigned minor;
576 sign = *vers;
577 if (sign == '+' || sign == '-')
578 num = simple_strtol((vers+1), &minorp, 0);
579 else
580 num = simple_strtol(vers, &minorp, 0);
581 if (*minorp == '.') {
582 if (num != 4)
583 return -EINVAL;
584 if (kstrtouint(minorp+1, 0, &minor) < 0)
585 return -EINVAL;
586 }
587
588 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
589 switch(num) {
590 #ifdef CONFIG_NFSD_V2
591 case 2:
592 #endif
593 case 3:
594 nfsd_vers(nn, num, cmd);
595 break;
596 case 4:
597 if (*minorp == '.') {
598 if (nfsd_minorversion(nn, minor, cmd) < 0)
599 return -EINVAL;
600 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
601 /*
602 * Either we have +4 and no minors are enabled,
603 * or we have -4 and at least one minor is enabled.
604 * In either case, propagate 'cmd' to all minors.
605 */
606 minor = 0;
607 while (nfsd_minorversion(nn, minor, cmd) >= 0)
608 minor++;
609 }
610 break;
611 default:
612 /* Ignore requests to disable non-existent versions */
613 if (cmd == NFSD_SET)
614 return -EINVAL;
615 }
616 vers += len + 1;
617 } while ((len = qword_get(&mesg, vers, size)) > 0);
618 /* If all get turned off, turn them back on, as
619 * having no versions is BAD
620 */
621 nfsd_reset_versions(nn);
622 }
623
624 /* Now write current state into reply buffer */
625 sep = "";
626 remaining = SIMPLE_TRANSACTION_LIMIT;
627 for (num=2 ; num <= 4 ; num++) {
628 int minor;
629 if (!nfsd_vers(nn, num, NFSD_AVAIL))
630 continue;
631
632 minor = -1;
633 do {
634 len = nfsd_print_version_support(nn, buf, remaining,
635 sep, num, minor);
636 if (len >= remaining)
637 goto out;
638 remaining -= len;
639 buf += len;
640 tlen += len;
641 minor++;
642 if (len)
643 sep = " ";
644 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
645 }
646 out:
647 len = snprintf(buf, remaining, "\n");
648 if (len >= remaining)
649 return -EINVAL;
650 return tlen + len;
651 }
652
653 /*
654 * write_versions - Set or report the available NFS protocol versions
655 *
656 * Input:
657 * buf: ignored
658 * size: zero
659 * Output:
660 * On success: passed-in buffer filled with '\n'-terminated C
661 * string containing positive or negative integer
662 * values representing the current status of each
663 * protocol version;
664 * return code is the size in bytes of the string
665 * On error: return code is zero or a negative errno value
666 *
667 * OR
668 *
669 * Input:
670 * buf: C string containing whitespace-
671 * separated positive or negative
672 * integer values representing NFS
673 * protocol versions to enable ("+n")
674 * or disable ("-n")
675 * size: non-zero length of C string in @buf
676 * Output:
677 * On success: status of zero or more protocol versions has
678 * been updated; passed-in buffer filled with
679 * '\n'-terminated C string containing positive
680 * or negative integer values representing the
681 * current status of each protocol version;
682 * return code is the size in bytes of the string
683 * On error: return code is zero or a negative errno value
684 */
write_versions(struct file * file,char * buf,size_t size)685 static ssize_t write_versions(struct file *file, char *buf, size_t size)
686 {
687 ssize_t rv;
688
689 mutex_lock(&nfsd_mutex);
690 rv = __write_versions(file, buf, size);
691 mutex_unlock(&nfsd_mutex);
692 return rv;
693 }
694
695 /*
696 * Zero-length write. Return a list of NFSD's current listener
697 * transports.
698 */
__write_ports_names(char * buf,struct net * net)699 static ssize_t __write_ports_names(char *buf, struct net *net)
700 {
701 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
702
703 if (nn->nfsd_serv == NULL)
704 return 0;
705 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
706 }
707
708 /*
709 * A single 'fd' number was written, in which case it must be for
710 * a socket of a supported family/protocol, and we use it as an
711 * nfsd listener.
712 */
__write_ports_addfd(char * buf,struct net * net,const struct cred * cred)713 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
714 {
715 char *mesg = buf;
716 int fd, err;
717 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
718 struct svc_serv *serv;
719
720 err = get_int(&mesg, &fd);
721 if (err != 0 || fd < 0)
722 return -EINVAL;
723 trace_nfsd_ctl_ports_addfd(net, fd);
724
725 err = nfsd_create_serv(net);
726 if (err != 0)
727 return err;
728
729 serv = nn->nfsd_serv;
730 err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
731
732 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
733 nfsd_destroy_serv(net);
734
735 return err;
736 }
737
738 /*
739 * A transport listener is added by writing its transport name and
740 * a port number.
741 */
__write_ports_addxprt(char * buf,struct net * net,const struct cred * cred)742 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
743 {
744 char transport[16];
745 struct svc_xprt *xprt;
746 int port, err;
747 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
748 struct svc_serv *serv;
749
750 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
751 return -EINVAL;
752
753 if (port < 1 || port > USHRT_MAX)
754 return -EINVAL;
755 trace_nfsd_ctl_ports_addxprt(net, transport, port);
756
757 err = nfsd_create_serv(net);
758 if (err != 0)
759 return err;
760
761 serv = nn->nfsd_serv;
762 err = svc_xprt_create(serv, transport, net,
763 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
764 if (err < 0)
765 goto out_err;
766
767 err = svc_xprt_create(serv, transport, net,
768 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
769 if (err < 0 && err != -EAFNOSUPPORT)
770 goto out_close;
771
772 return 0;
773 out_close:
774 xprt = svc_find_xprt(serv, transport, net, PF_INET, port);
775 if (xprt != NULL) {
776 svc_xprt_close(xprt);
777 svc_xprt_put(xprt);
778 }
779 out_err:
780 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
781 nfsd_destroy_serv(net);
782
783 return err;
784 }
785
__write_ports(struct file * file,char * buf,size_t size,struct net * net)786 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
787 struct net *net)
788 {
789 if (size == 0)
790 return __write_ports_names(buf, net);
791
792 if (isdigit(buf[0]))
793 return __write_ports_addfd(buf, net, file->f_cred);
794
795 if (isalpha(buf[0]))
796 return __write_ports_addxprt(buf, net, file->f_cred);
797
798 return -EINVAL;
799 }
800
801 /*
802 * write_ports - Pass a socket file descriptor or transport name to listen on
803 *
804 * Input:
805 * buf: ignored
806 * size: zero
807 * Output:
808 * On success: passed-in buffer filled with a '\n'-terminated C
809 * string containing a whitespace-separated list of
810 * named NFSD listeners;
811 * return code is the size in bytes of the string
812 * On error: return code is zero or a negative errno value
813 *
814 * OR
815 *
816 * Input:
817 * buf: C string containing an unsigned
818 * integer value representing a bound
819 * but unconnected socket that is to be
820 * used as an NFSD listener; listen(3)
821 * must be called for a SOCK_STREAM
822 * socket, otherwise it is ignored
823 * size: non-zero length of C string in @buf
824 * Output:
825 * On success: NFS service is started;
826 * passed-in buffer filled with a '\n'-terminated C
827 * string containing a unique alphanumeric name of
828 * the listener;
829 * return code is the size in bytes of the string
830 * On error: return code is a negative errno value
831 *
832 * OR
833 *
834 * Input:
835 * buf: C string containing a transport
836 * name and an unsigned integer value
837 * representing the port to listen on,
838 * separated by whitespace
839 * size: non-zero length of C string in @buf
840 * Output:
841 * On success: returns zero; NFS service is started
842 * On error: return code is a negative errno value
843 */
write_ports(struct file * file,char * buf,size_t size)844 static ssize_t write_ports(struct file *file, char *buf, size_t size)
845 {
846 ssize_t rv;
847
848 mutex_lock(&nfsd_mutex);
849 rv = __write_ports(file, buf, size, netns(file));
850 mutex_unlock(&nfsd_mutex);
851 return rv;
852 }
853
854
855 int nfsd_max_blksize;
856
857 /*
858 * write_maxblksize - Set or report the current NFS blksize
859 *
860 * Input:
861 * buf: ignored
862 * size: zero
863 *
864 * OR
865 *
866 * Input:
867 * buf: C string containing an unsigned
868 * integer value representing the new
869 * NFS blksize
870 * size: non-zero length of C string in @buf
871 * Output:
872 * On success: passed-in buffer filled with '\n'-terminated C string
873 * containing numeric value of the current NFS blksize
874 * setting;
875 * return code is the size in bytes of the string
876 * On error: return code is zero or a negative errno value
877 */
write_maxblksize(struct file * file,char * buf,size_t size)878 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
879 {
880 char *mesg = buf;
881 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
882
883 if (size > 0) {
884 int bsize;
885 int rv = get_int(&mesg, &bsize);
886 if (rv)
887 return rv;
888 trace_nfsd_ctl_maxblksize(netns(file), bsize);
889
890 /* force bsize into allowed range and
891 * required alignment.
892 */
893 bsize = max_t(int, bsize, 1024);
894 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
895 bsize &= ~(1024-1);
896 mutex_lock(&nfsd_mutex);
897 if (nn->nfsd_serv) {
898 mutex_unlock(&nfsd_mutex);
899 return -EBUSY;
900 }
901 nfsd_max_blksize = bsize;
902 mutex_unlock(&nfsd_mutex);
903 }
904
905 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
906 nfsd_max_blksize);
907 }
908
909 #ifdef CONFIG_NFSD_V4
__nfsd4_write_time(struct file * file,char * buf,size_t size,time64_t * time,struct nfsd_net * nn)910 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
911 time64_t *time, struct nfsd_net *nn)
912 {
913 struct dentry *dentry = file_dentry(file);
914 char *mesg = buf;
915 int rv, i;
916
917 if (size > 0) {
918 if (nn->nfsd_serv)
919 return -EBUSY;
920 rv = get_int(&mesg, &i);
921 if (rv)
922 return rv;
923 trace_nfsd_ctl_time(netns(file), dentry->d_name.name,
924 dentry->d_name.len, i);
925
926 /*
927 * Some sanity checking. We don't have a reason for
928 * these particular numbers, but problems with the
929 * extremes are:
930 * - Too short: the briefest network outage may
931 * cause clients to lose all their locks. Also,
932 * the frequent polling may be wasteful.
933 * - Too long: do you really want reboot recovery
934 * to take more than an hour? Or to make other
935 * clients wait an hour before being able to
936 * revoke a dead client's locks?
937 */
938 if (i < 10 || i > 3600)
939 return -EINVAL;
940 *time = i;
941 }
942
943 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
944 }
945
nfsd4_write_time(struct file * file,char * buf,size_t size,time64_t * time,struct nfsd_net * nn)946 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
947 time64_t *time, struct nfsd_net *nn)
948 {
949 ssize_t rv;
950
951 mutex_lock(&nfsd_mutex);
952 rv = __nfsd4_write_time(file, buf, size, time, nn);
953 mutex_unlock(&nfsd_mutex);
954 return rv;
955 }
956
957 /*
958 * write_leasetime - Set or report the current NFSv4 lease time
959 *
960 * Input:
961 * buf: ignored
962 * size: zero
963 *
964 * OR
965 *
966 * Input:
967 * buf: C string containing an unsigned
968 * integer value representing the new
969 * NFSv4 lease expiry time
970 * size: non-zero length of C string in @buf
971 * Output:
972 * On success: passed-in buffer filled with '\n'-terminated C
973 * string containing unsigned integer value of the
974 * current lease expiry time;
975 * return code is the size in bytes of the string
976 * On error: return code is zero or a negative errno value
977 */
write_leasetime(struct file * file,char * buf,size_t size)978 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
979 {
980 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
981 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
982 }
983
984 /*
985 * write_gracetime - Set or report current NFSv4 grace period time
986 *
987 * As above, but sets the time of the NFSv4 grace period.
988 *
989 * Note this should never be set to less than the *previous*
990 * lease-period time, but we don't try to enforce this. (In the common
991 * case (a new boot), we don't know what the previous lease time was
992 * anyway.)
993 */
write_gracetime(struct file * file,char * buf,size_t size)994 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
995 {
996 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
997 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
998 }
999
1000 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
__write_recoverydir(struct file * file,char * buf,size_t size,struct nfsd_net * nn)1001 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1002 struct nfsd_net *nn)
1003 {
1004 char *mesg = buf;
1005 char *recdir;
1006 int len, status;
1007
1008 if (size > 0) {
1009 if (nn->nfsd_serv)
1010 return -EBUSY;
1011 if (size > PATH_MAX || buf[size-1] != '\n')
1012 return -EINVAL;
1013 buf[size-1] = 0;
1014
1015 recdir = mesg;
1016 len = qword_get(&mesg, recdir, size);
1017 if (len <= 0)
1018 return -EINVAL;
1019 trace_nfsd_ctl_recoverydir(netns(file), recdir);
1020
1021 status = nfs4_reset_recoverydir(recdir);
1022 if (status)
1023 return status;
1024 }
1025
1026 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1027 nfs4_recoverydir());
1028 }
1029
1030 /*
1031 * write_recoverydir - Set or report the pathname of the recovery directory
1032 *
1033 * Input:
1034 * buf: ignored
1035 * size: zero
1036 *
1037 * OR
1038 *
1039 * Input:
1040 * buf: C string containing the pathname
1041 * of the directory on a local file
1042 * system containing permanent NFSv4
1043 * recovery data
1044 * size: non-zero length of C string in @buf
1045 * Output:
1046 * On success: passed-in buffer filled with '\n'-terminated C string
1047 * containing the current recovery pathname setting;
1048 * return code is the size in bytes of the string
1049 * On error: return code is zero or a negative errno value
1050 */
write_recoverydir(struct file * file,char * buf,size_t size)1051 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1052 {
1053 ssize_t rv;
1054 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1055
1056 mutex_lock(&nfsd_mutex);
1057 rv = __write_recoverydir(file, buf, size, nn);
1058 mutex_unlock(&nfsd_mutex);
1059 return rv;
1060 }
1061 #endif
1062
1063 /*
1064 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1065 *
1066 * Input:
1067 * buf: ignored
1068 * size: zero
1069 * OR
1070 *
1071 * Input:
1072 * buf: any value
1073 * size: non-zero length of C string in @buf
1074 * Output:
1075 * passed-in buffer filled with "Y" or "N" with a newline
1076 * and NULL-terminated C string. This indicates whether
1077 * the grace period has ended in the current net
1078 * namespace. Return code is the size in bytes of the
1079 * string. Writing a string that starts with 'Y', 'y', or
1080 * '1' to the file will end the grace period for nfsd's v4
1081 * lock manager.
1082 */
write_v4_end_grace(struct file * file,char * buf,size_t size)1083 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1084 {
1085 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1086
1087 if (size > 0) {
1088 switch(buf[0]) {
1089 case 'Y':
1090 case 'y':
1091 case '1':
1092 if (!nfsd4_force_end_grace(nn))
1093 return -EBUSY;
1094 trace_nfsd_end_grace(netns(file));
1095 break;
1096 default:
1097 return -EINVAL;
1098 }
1099 }
1100
1101 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1102 nn->grace_ended ? 'Y' : 'N');
1103 }
1104
1105 #endif
1106
1107 /*----------------------------------------------------------------------------*/
1108 /*
1109 * populating the filesystem.
1110 */
1111
nfsd_get_inode(struct super_block * sb,umode_t mode)1112 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1113 {
1114 struct inode *inode = new_inode(sb);
1115 if (inode) {
1116 /* Following advice from simple_fill_super documentation: */
1117 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1118 inode->i_mode = mode;
1119 simple_inode_init_ts(inode);
1120 }
1121 return inode;
1122 }
1123
nfsd_mkdir(struct dentry * parent,struct nfsdfs_client * ncl,char * name)1124 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1125 {
1126 struct inode *dir = parent->d_inode;
1127 struct dentry *dentry;
1128 struct inode *inode;
1129
1130 inode = nfsd_get_inode(parent->d_sb, S_IFDIR | 0600);
1131 if (!inode)
1132 return ERR_PTR(-ENOMEM);
1133
1134 dentry = simple_start_creating(parent, name);
1135 if (IS_ERR(dentry)) {
1136 iput(inode);
1137 return dentry;
1138 }
1139 inode->i_fop = &simple_dir_operations;
1140 inode->i_op = &simple_dir_inode_operations;
1141 inc_nlink(inode);
1142 if (ncl) {
1143 inode->i_private = ncl;
1144 kref_get(&ncl->cl_ref);
1145 }
1146 d_make_persistent(dentry, inode);
1147 inc_nlink(dir);
1148 fsnotify_mkdir(dir, dentry);
1149 simple_done_creating(dentry);
1150 return dentry; // borrowed
1151 }
1152
1153 #if IS_ENABLED(CONFIG_SUNRPC_GSS)
1154 /*
1155 * @content is assumed to be a NUL-terminated string that lives
1156 * longer than the symlink itself.
1157 */
_nfsd_symlink(struct dentry * parent,const char * name,const char * content)1158 static void _nfsd_symlink(struct dentry *parent, const char *name,
1159 const char *content)
1160 {
1161 struct inode *dir = parent->d_inode;
1162 struct inode *inode;
1163 struct dentry *dentry;
1164
1165 inode = nfsd_get_inode(dir->i_sb, S_IFLNK | 0777);
1166 if (!inode)
1167 return;
1168
1169 dentry = simple_start_creating(parent, name);
1170 if (IS_ERR(dentry)) {
1171 iput(inode);
1172 return;
1173 }
1174
1175 inode->i_op = &simple_symlink_inode_operations;
1176 inode->i_link = (char *)content;
1177 inode->i_size = strlen(content);
1178
1179 d_make_persistent(dentry, inode);
1180 fsnotify_create(dir, dentry);
1181 simple_done_creating(dentry);
1182 }
1183 #else
_nfsd_symlink(struct dentry * parent,const char * name,const char * content)1184 static inline void _nfsd_symlink(struct dentry *parent, const char *name,
1185 const char *content)
1186 {
1187 }
1188
1189 #endif
1190
clear_ncl(struct dentry * dentry)1191 static void clear_ncl(struct dentry *dentry)
1192 {
1193 struct inode *inode = d_inode(dentry);
1194 struct nfsdfs_client *ncl = inode->i_private;
1195
1196 spin_lock(&inode->i_lock);
1197 inode->i_private = NULL;
1198 spin_unlock(&inode->i_lock);
1199 kref_put(&ncl->cl_ref, ncl->cl_release);
1200 }
1201
get_nfsdfs_client(struct inode * inode)1202 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1203 {
1204 struct nfsdfs_client *nc;
1205
1206 spin_lock(&inode->i_lock);
1207 nc = inode->i_private;
1208 if (nc)
1209 kref_get(&nc->cl_ref);
1210 spin_unlock(&inode->i_lock);
1211 return nc;
1212 }
1213
1214 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1215 * code instead. */
nfsdfs_create_files(struct dentry * root,const struct tree_descr * files,struct nfsdfs_client * ncl,struct dentry ** fdentries)1216 static int nfsdfs_create_files(struct dentry *root,
1217 const struct tree_descr *files,
1218 struct nfsdfs_client *ncl,
1219 struct dentry **fdentries)
1220 {
1221 struct inode *dir = d_inode(root);
1222 struct dentry *dentry;
1223
1224 for (int i = 0; files->name && files->name[0]; i++, files++) {
1225 struct inode *inode = nfsd_get_inode(root->d_sb,
1226 S_IFREG | files->mode);
1227 if (!inode)
1228 return -ENOMEM;
1229 dentry = simple_start_creating(root, files->name);
1230 if (IS_ERR(dentry)) {
1231 iput(inode);
1232 return PTR_ERR(dentry);
1233 }
1234 kref_get(&ncl->cl_ref);
1235 inode->i_fop = files->ops;
1236 inode->i_private = ncl;
1237 d_make_persistent(dentry, inode);
1238 fsnotify_create(dir, dentry);
1239 if (fdentries)
1240 fdentries[i] = dentry; // borrowed
1241 simple_done_creating(dentry);
1242 }
1243 return 0;
1244 }
1245
1246 /* on success, returns positive number unique to that client. */
nfsd_client_mkdir(struct nfsd_net * nn,struct nfsdfs_client * ncl,u32 id,const struct tree_descr * files,struct dentry ** fdentries)1247 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1248 struct nfsdfs_client *ncl, u32 id,
1249 const struct tree_descr *files,
1250 struct dentry **fdentries)
1251 {
1252 struct dentry *dentry;
1253 char name[11];
1254 int ret;
1255
1256 sprintf(name, "%u", id);
1257
1258 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1259 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1260 return NULL;
1261 ret = nfsdfs_create_files(dentry, files, ncl, fdentries);
1262 if (ret) {
1263 nfsd_client_rmdir(dentry);
1264 return NULL;
1265 }
1266 return dentry;
1267 }
1268
1269 /* Taken from __rpc_rmdir: */
nfsd_client_rmdir(struct dentry * dentry)1270 void nfsd_client_rmdir(struct dentry *dentry)
1271 {
1272 simple_recursive_removal(dentry, clear_ncl);
1273 }
1274
nfsd_fill_super(struct super_block * sb,struct fs_context * fc)1275 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1276 {
1277 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1278 nfsd_net_id);
1279 struct dentry *dentry;
1280 int ret;
1281
1282 static const struct tree_descr nfsd_files[] = {
1283 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1284 /* Per-export io stats use same ops as exports file */
1285 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1286 [NFSD_Export_features] = {"export_features",
1287 &export_features_fops, S_IRUGO},
1288 [NFSD_FO_UnlockIP] = {"unlock_ip",
1289 &transaction_ops, S_IWUSR|S_IRUSR},
1290 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1291 &transaction_ops, S_IWUSR|S_IRUSR},
1292 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1293 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1294 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1295 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1296 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1297 &nfsd_reply_cache_stats_fops, S_IRUGO},
1298 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1299 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1300 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1301 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1302 #ifdef CONFIG_NFSD_V4
1303 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1304 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1305 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1306 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1307 #endif
1308 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1309 #endif
1310 /* last one */ {""}
1311 };
1312
1313 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1314 if (ret)
1315 return ret;
1316 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes",
1317 "/proc/net/rpc/gss_krb5_enctypes");
1318 dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1319 if (IS_ERR(dentry))
1320 return PTR_ERR(dentry);
1321 nn->nfsd_client_dir = dentry;
1322 return 0;
1323 }
1324
nfsd_fs_get_tree(struct fs_context * fc)1325 static int nfsd_fs_get_tree(struct fs_context *fc)
1326 {
1327 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1328 }
1329
nfsd_fs_free_fc(struct fs_context * fc)1330 static void nfsd_fs_free_fc(struct fs_context *fc)
1331 {
1332 if (fc->s_fs_info)
1333 put_net(fc->s_fs_info);
1334 }
1335
1336 static const struct fs_context_operations nfsd_fs_context_ops = {
1337 .free = nfsd_fs_free_fc,
1338 .get_tree = nfsd_fs_get_tree,
1339 };
1340
nfsd_init_fs_context(struct fs_context * fc)1341 static int nfsd_init_fs_context(struct fs_context *fc)
1342 {
1343 put_user_ns(fc->user_ns);
1344 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1345 fc->ops = &nfsd_fs_context_ops;
1346 return 0;
1347 }
1348
nfsd_umount(struct super_block * sb)1349 static void nfsd_umount(struct super_block *sb)
1350 {
1351 struct net *net = sb->s_fs_info;
1352
1353 nfsd_shutdown_threads(net);
1354
1355 kill_anon_super(sb);
1356 put_net(net);
1357 }
1358
1359 static struct file_system_type nfsd_fs_type = {
1360 .owner = THIS_MODULE,
1361 .name = "nfsd",
1362 .init_fs_context = nfsd_init_fs_context,
1363 .kill_sb = nfsd_umount,
1364 };
1365 MODULE_ALIAS_FS("nfsd");
1366
1367 #ifdef CONFIG_PROC_FS
1368
exports_proc_open(struct inode * inode,struct file * file)1369 static int exports_proc_open(struct inode *inode, struct file *file)
1370 {
1371 return exports_net_open(current->nsproxy->net_ns, file);
1372 }
1373
1374 static const struct proc_ops exports_proc_ops = {
1375 .proc_open = exports_proc_open,
1376 .proc_read = seq_read,
1377 .proc_lseek = seq_lseek,
1378 .proc_release = seq_release,
1379 };
1380
create_proc_exports_entry(void)1381 static int create_proc_exports_entry(void)
1382 {
1383 struct proc_dir_entry *entry;
1384
1385 entry = proc_mkdir("fs/nfs", NULL);
1386 if (!entry)
1387 return -ENOMEM;
1388 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1389 if (!entry) {
1390 remove_proc_entry("fs/nfs", NULL);
1391 return -ENOMEM;
1392 }
1393 return 0;
1394 }
1395 #else /* CONFIG_PROC_FS */
create_proc_exports_entry(void)1396 static int create_proc_exports_entry(void)
1397 {
1398 return 0;
1399 }
1400 #endif
1401
1402 unsigned int nfsd_net_id;
1403
nfsd_genl_rpc_status_compose_msg(struct sk_buff * skb,struct netlink_callback * cb,struct nfsd_genl_rqstp * genl_rqstp)1404 static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
1405 struct netlink_callback *cb,
1406 struct nfsd_genl_rqstp *genl_rqstp)
1407 {
1408 void *hdr;
1409 u32 i;
1410
1411 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1412 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET);
1413 if (!hdr)
1414 return -ENOBUFS;
1415
1416 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, genl_rqstp->rq_xid) ||
1417 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, genl_rqstp->rq_flags) ||
1418 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, genl_rqstp->rq_prog) ||
1419 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, genl_rqstp->rq_proc) ||
1420 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, genl_rqstp->rq_vers) ||
1421 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME,
1422 ktime_to_us(genl_rqstp->rq_stime),
1423 NFSD_A_RPC_STATUS_PAD))
1424 return -ENOBUFS;
1425
1426 switch (genl_rqstp->rq_saddr.sa_family) {
1427 case AF_INET: {
1428 const struct sockaddr_in *s_in, *d_in;
1429
1430 s_in = (const struct sockaddr_in *)&genl_rqstp->rq_saddr;
1431 d_in = (const struct sockaddr_in *)&genl_rqstp->rq_daddr;
1432 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4,
1433 s_in->sin_addr.s_addr) ||
1434 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4,
1435 d_in->sin_addr.s_addr) ||
1436 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1437 s_in->sin_port) ||
1438 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1439 d_in->sin_port))
1440 return -ENOBUFS;
1441 break;
1442 }
1443 case AF_INET6: {
1444 const struct sockaddr_in6 *s_in, *d_in;
1445
1446 s_in = (const struct sockaddr_in6 *)&genl_rqstp->rq_saddr;
1447 d_in = (const struct sockaddr_in6 *)&genl_rqstp->rq_daddr;
1448 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6,
1449 &s_in->sin6_addr) ||
1450 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6,
1451 &d_in->sin6_addr) ||
1452 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1453 s_in->sin6_port) ||
1454 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1455 d_in->sin6_port))
1456 return -ENOBUFS;
1457 break;
1458 }
1459 }
1460
1461 for (i = 0; i < genl_rqstp->rq_opcnt; i++)
1462 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS,
1463 genl_rqstp->rq_opnum[i]))
1464 return -ENOBUFS;
1465
1466 genlmsg_end(skb, hdr);
1467 return 0;
1468 }
1469
1470 /**
1471 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit
1472 * @skb: reply buffer
1473 * @cb: netlink metadata and command arguments
1474 *
1475 * Returns the size of the reply or a negative errno.
1476 */
nfsd_nl_rpc_status_get_dumpit(struct sk_buff * skb,struct netlink_callback * cb)1477 int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
1478 struct netlink_callback *cb)
1479 {
1480 int i, ret, rqstp_index = 0;
1481 struct nfsd_net *nn;
1482
1483 mutex_lock(&nfsd_mutex);
1484
1485 nn = net_generic(sock_net(skb->sk), nfsd_net_id);
1486 if (!nn->nfsd_serv) {
1487 ret = -ENODEV;
1488 goto out_unlock;
1489 }
1490
1491 rcu_read_lock();
1492
1493 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
1494 struct svc_rqst *rqstp;
1495
1496 if (i < cb->args[0]) /* already consumed */
1497 continue;
1498
1499 rqstp_index = 0;
1500 list_for_each_entry_rcu(rqstp,
1501 &nn->nfsd_serv->sv_pools[i].sp_all_threads,
1502 rq_all) {
1503 struct nfsd_genl_rqstp genl_rqstp;
1504 unsigned int status_counter;
1505
1506 if (rqstp_index++ < cb->args[1]) /* already consumed */
1507 continue;
1508 /*
1509 * Acquire rq_status_counter before parsing the rqst
1510 * fields. rq_status_counter is set to an odd value in
1511 * order to notify the consumers the rqstp fields are
1512 * meaningful.
1513 */
1514 status_counter =
1515 smp_load_acquire(&rqstp->rq_status_counter);
1516 if (!(status_counter & 1))
1517 continue;
1518
1519 genl_rqstp.rq_xid = rqstp->rq_xid;
1520 genl_rqstp.rq_flags = rqstp->rq_flags;
1521 genl_rqstp.rq_vers = rqstp->rq_vers;
1522 genl_rqstp.rq_prog = rqstp->rq_prog;
1523 genl_rqstp.rq_proc = rqstp->rq_proc;
1524 genl_rqstp.rq_stime = rqstp->rq_stime;
1525 genl_rqstp.rq_opcnt = 0;
1526 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
1527 sizeof(struct sockaddr));
1528 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
1529 sizeof(struct sockaddr));
1530
1531 #ifdef CONFIG_NFSD_V4
1532 if (rqstp->rq_vers == NFS4_VERSION &&
1533 rqstp->rq_proc == NFSPROC4_COMPOUND) {
1534 /* NFSv4 compound */
1535 struct nfsd4_compoundargs *args;
1536 int j;
1537
1538 args = rqstp->rq_argp;
1539 genl_rqstp.rq_opcnt = min_t(u32, args->opcnt,
1540 ARRAY_SIZE(genl_rqstp.rq_opnum));
1541 for (j = 0; j < genl_rqstp.rq_opcnt; j++)
1542 genl_rqstp.rq_opnum[j] =
1543 args->ops[j].opnum;
1544 }
1545 #endif /* CONFIG_NFSD_V4 */
1546
1547 /*
1548 * Acquire rq_status_counter before reporting the rqst
1549 * fields to the user.
1550 */
1551 if (smp_load_acquire(&rqstp->rq_status_counter) !=
1552 status_counter)
1553 continue;
1554
1555 ret = nfsd_genl_rpc_status_compose_msg(skb, cb,
1556 &genl_rqstp);
1557 if (ret)
1558 goto out;
1559 }
1560 }
1561
1562 cb->args[0] = i;
1563 cb->args[1] = rqstp_index;
1564 ret = skb->len;
1565 out:
1566 rcu_read_unlock();
1567 out_unlock:
1568 mutex_unlock(&nfsd_mutex);
1569
1570 return ret;
1571 }
1572
1573 /**
1574 * nfsd_nl_threads_set_doit - set the number of running threads
1575 * @skb: reply buffer
1576 * @info: netlink metadata and command arguments
1577 *
1578 * Return 0 on success or a negative errno.
1579 */
nfsd_nl_threads_set_doit(struct sk_buff * skb,struct genl_info * info)1580 int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info)
1581 {
1582 int *nthreads, nrpools = 0, i, ret = -EOPNOTSUPP, rem;
1583 struct net *net = genl_info_net(info);
1584 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1585 const struct nlattr *attr;
1586 const char *scope = NULL;
1587
1588 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_THREADS))
1589 return -EINVAL;
1590
1591 /* count number of SERVER_THREADS values */
1592 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_THREADS, info->nlhdr,
1593 GENL_HDRLEN, rem)
1594 nrpools++;
1595
1596 mutex_lock(&nfsd_mutex);
1597
1598 nthreads = kcalloc(nrpools, sizeof(int), GFP_KERNEL);
1599 if (!nthreads) {
1600 ret = -ENOMEM;
1601 goto out_unlock;
1602 }
1603
1604 i = 0;
1605 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_THREADS, info->nlhdr,
1606 GENL_HDRLEN, rem) {
1607 nthreads[i++] = nla_get_u32(attr);
1608 if (i >= nrpools)
1609 break;
1610 }
1611
1612 if (info->attrs[NFSD_A_SERVER_GRACETIME] ||
1613 info->attrs[NFSD_A_SERVER_LEASETIME] ||
1614 info->attrs[NFSD_A_SERVER_SCOPE]) {
1615 ret = -EBUSY;
1616 if (nn->nfsd_serv && nn->nfsd_serv->sv_nrthreads)
1617 goto out_unlock;
1618
1619 ret = -EINVAL;
1620 attr = info->attrs[NFSD_A_SERVER_GRACETIME];
1621 if (attr) {
1622 u32 gracetime = nla_get_u32(attr);
1623
1624 if (gracetime < 10 || gracetime > 3600)
1625 goto out_unlock;
1626
1627 nn->nfsd4_grace = gracetime;
1628 }
1629
1630 attr = info->attrs[NFSD_A_SERVER_LEASETIME];
1631 if (attr) {
1632 u32 leasetime = nla_get_u32(attr);
1633
1634 if (leasetime < 10 || leasetime > 3600)
1635 goto out_unlock;
1636
1637 nn->nfsd4_lease = leasetime;
1638 }
1639
1640 attr = info->attrs[NFSD_A_SERVER_SCOPE];
1641 if (attr)
1642 scope = nla_data(attr);
1643 }
1644
1645 ret = nfsd_svc(nrpools, nthreads, net, get_current_cred(), scope);
1646 if (ret > 0)
1647 ret = 0;
1648 out_unlock:
1649 mutex_unlock(&nfsd_mutex);
1650 kfree(nthreads);
1651 return ret;
1652 }
1653
1654 /**
1655 * nfsd_nl_threads_get_doit - get the number of running threads
1656 * @skb: reply buffer
1657 * @info: netlink metadata and command arguments
1658 *
1659 * Return 0 on success or a negative errno.
1660 */
nfsd_nl_threads_get_doit(struct sk_buff * skb,struct genl_info * info)1661 int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info)
1662 {
1663 struct net *net = genl_info_net(info);
1664 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1665 void *hdr;
1666 int err;
1667
1668 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
1669 if (!skb)
1670 return -ENOMEM;
1671
1672 hdr = genlmsg_iput(skb, info);
1673 if (!hdr) {
1674 err = -EMSGSIZE;
1675 goto err_free_msg;
1676 }
1677
1678 mutex_lock(&nfsd_mutex);
1679
1680 err = nla_put_u32(skb, NFSD_A_SERVER_GRACETIME,
1681 nn->nfsd4_grace) ||
1682 nla_put_u32(skb, NFSD_A_SERVER_LEASETIME,
1683 nn->nfsd4_lease) ||
1684 nla_put_string(skb, NFSD_A_SERVER_SCOPE,
1685 nn->nfsd_name);
1686 if (err)
1687 goto err_unlock;
1688
1689 if (nn->nfsd_serv) {
1690 int i;
1691
1692 for (i = 0; i < nfsd_nrpools(net); ++i) {
1693 struct svc_pool *sp = &nn->nfsd_serv->sv_pools[i];
1694
1695 err = nla_put_u32(skb, NFSD_A_SERVER_THREADS,
1696 sp->sp_nrthreads);
1697 if (err)
1698 goto err_unlock;
1699 }
1700 } else {
1701 err = nla_put_u32(skb, NFSD_A_SERVER_THREADS, 0);
1702 if (err)
1703 goto err_unlock;
1704 }
1705
1706 mutex_unlock(&nfsd_mutex);
1707
1708 genlmsg_end(skb, hdr);
1709
1710 return genlmsg_reply(skb, info);
1711
1712 err_unlock:
1713 mutex_unlock(&nfsd_mutex);
1714 err_free_msg:
1715 nlmsg_free(skb);
1716
1717 return err;
1718 }
1719
1720 /**
1721 * nfsd_nl_version_set_doit - set the nfs enabled versions
1722 * @skb: reply buffer
1723 * @info: netlink metadata and command arguments
1724 *
1725 * Return 0 on success or a negative errno.
1726 */
nfsd_nl_version_set_doit(struct sk_buff * skb,struct genl_info * info)1727 int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info)
1728 {
1729 const struct nlattr *attr;
1730 struct nfsd_net *nn;
1731 int i, rem;
1732
1733 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_PROTO_VERSION))
1734 return -EINVAL;
1735
1736 mutex_lock(&nfsd_mutex);
1737
1738 nn = net_generic(genl_info_net(info), nfsd_net_id);
1739 if (nn->nfsd_serv) {
1740 mutex_unlock(&nfsd_mutex);
1741 return -EBUSY;
1742 }
1743
1744 /* clear current supported versions. */
1745 nfsd_vers(nn, 2, NFSD_CLEAR);
1746 nfsd_vers(nn, 3, NFSD_CLEAR);
1747 for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++)
1748 nfsd_minorversion(nn, i, NFSD_CLEAR);
1749
1750 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_PROTO_VERSION, info->nlhdr,
1751 GENL_HDRLEN, rem) {
1752 struct nlattr *tb[NFSD_A_VERSION_MAX + 1];
1753 u32 major, minor = 0;
1754 bool enabled;
1755
1756 if (nla_parse_nested(tb, NFSD_A_VERSION_MAX, attr,
1757 nfsd_version_nl_policy, info->extack) < 0)
1758 continue;
1759
1760 if (!tb[NFSD_A_VERSION_MAJOR])
1761 continue;
1762
1763 major = nla_get_u32(tb[NFSD_A_VERSION_MAJOR]);
1764 if (tb[NFSD_A_VERSION_MINOR])
1765 minor = nla_get_u32(tb[NFSD_A_VERSION_MINOR]);
1766
1767 enabled = nla_get_flag(tb[NFSD_A_VERSION_ENABLED]);
1768
1769 switch (major) {
1770 case 4:
1771 nfsd_minorversion(nn, minor, enabled ? NFSD_SET : NFSD_CLEAR);
1772 break;
1773 case 3:
1774 case 2:
1775 if (!minor)
1776 nfsd_vers(nn, major, enabled ? NFSD_SET : NFSD_CLEAR);
1777 break;
1778 default:
1779 break;
1780 }
1781 }
1782
1783 mutex_unlock(&nfsd_mutex);
1784
1785 return 0;
1786 }
1787
1788 /**
1789 * nfsd_nl_version_get_doit - get the enabled status for all supported nfs versions
1790 * @skb: reply buffer
1791 * @info: netlink metadata and command arguments
1792 *
1793 * Return 0 on success or a negative errno.
1794 */
nfsd_nl_version_get_doit(struct sk_buff * skb,struct genl_info * info)1795 int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info)
1796 {
1797 struct nfsd_net *nn;
1798 int i, err;
1799 void *hdr;
1800
1801 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
1802 if (!skb)
1803 return -ENOMEM;
1804
1805 hdr = genlmsg_iput(skb, info);
1806 if (!hdr) {
1807 err = -EMSGSIZE;
1808 goto err_free_msg;
1809 }
1810
1811 mutex_lock(&nfsd_mutex);
1812 nn = net_generic(genl_info_net(info), nfsd_net_id);
1813
1814 for (i = 2; i <= 4; i++) {
1815 int j;
1816
1817 for (j = 0; j <= NFSD_SUPPORTED_MINOR_VERSION; j++) {
1818 struct nlattr *attr;
1819
1820 /* Don't record any versions the kernel doesn't have
1821 * compiled in
1822 */
1823 if (!nfsd_support_version(i))
1824 continue;
1825
1826 /* NFSv{2,3} does not support minor numbers */
1827 if (i < 4 && j)
1828 continue;
1829
1830 attr = nla_nest_start(skb,
1831 NFSD_A_SERVER_PROTO_VERSION);
1832 if (!attr) {
1833 err = -EINVAL;
1834 goto err_nfsd_unlock;
1835 }
1836
1837 if (nla_put_u32(skb, NFSD_A_VERSION_MAJOR, i) ||
1838 nla_put_u32(skb, NFSD_A_VERSION_MINOR, j)) {
1839 err = -EINVAL;
1840 goto err_nfsd_unlock;
1841 }
1842
1843 /* Set the enabled flag if the version is enabled */
1844 if (nfsd_vers(nn, i, NFSD_TEST) &&
1845 (i < 4 || nfsd_minorversion(nn, j, NFSD_TEST)) &&
1846 nla_put_flag(skb, NFSD_A_VERSION_ENABLED)) {
1847 err = -EINVAL;
1848 goto err_nfsd_unlock;
1849 }
1850
1851 nla_nest_end(skb, attr);
1852 }
1853 }
1854
1855 mutex_unlock(&nfsd_mutex);
1856 genlmsg_end(skb, hdr);
1857
1858 return genlmsg_reply(skb, info);
1859
1860 err_nfsd_unlock:
1861 mutex_unlock(&nfsd_mutex);
1862 err_free_msg:
1863 nlmsg_free(skb);
1864
1865 return err;
1866 }
1867
1868 /**
1869 * nfsd_nl_listener_set_doit - set the nfs running sockets
1870 * @skb: reply buffer
1871 * @info: netlink metadata and command arguments
1872 *
1873 * Return 0 on success or a negative errno.
1874 */
nfsd_nl_listener_set_doit(struct sk_buff * skb,struct genl_info * info)1875 int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info)
1876 {
1877 struct net *net = genl_info_net(info);
1878 struct svc_xprt *xprt, *tmp;
1879 const struct nlattr *attr;
1880 struct svc_serv *serv;
1881 LIST_HEAD(permsocks);
1882 struct nfsd_net *nn;
1883 bool delete = false;
1884 int err, rem;
1885
1886 mutex_lock(&nfsd_mutex);
1887
1888 err = nfsd_create_serv(net);
1889 if (err) {
1890 mutex_unlock(&nfsd_mutex);
1891 return err;
1892 }
1893
1894 nn = net_generic(net, nfsd_net_id);
1895 serv = nn->nfsd_serv;
1896
1897 spin_lock_bh(&serv->sv_lock);
1898
1899 /* Move all of the old listener sockets to a temp list */
1900 list_splice_init(&serv->sv_permsocks, &permsocks);
1901
1902 /*
1903 * Walk the list of server_socks from userland and move any that match
1904 * back to sv_permsocks
1905 */
1906 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_SOCK_ADDR, info->nlhdr,
1907 GENL_HDRLEN, rem) {
1908 struct nlattr *tb[NFSD_A_SOCK_MAX + 1];
1909 const char *xcl_name;
1910 struct sockaddr *sa;
1911
1912 if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr,
1913 nfsd_sock_nl_policy, info->extack) < 0)
1914 continue;
1915
1916 if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME])
1917 continue;
1918
1919 if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa))
1920 continue;
1921
1922 xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]);
1923 sa = nla_data(tb[NFSD_A_SOCK_ADDR]);
1924
1925 /* Put back any matching sockets */
1926 list_for_each_entry_safe(xprt, tmp, &permsocks, xpt_list) {
1927 /* This shouldn't be possible */
1928 if (WARN_ON_ONCE(xprt->xpt_net != net)) {
1929 list_move(&xprt->xpt_list, &serv->sv_permsocks);
1930 continue;
1931 }
1932
1933 /* If everything matches, put it back */
1934 if (!strcmp(xprt->xpt_class->xcl_name, xcl_name) &&
1935 rpc_cmp_addr_port(sa, (struct sockaddr *)&xprt->xpt_local)) {
1936 list_move(&xprt->xpt_list, &serv->sv_permsocks);
1937 break;
1938 }
1939 }
1940 }
1941
1942 /*
1943 * If there are listener transports remaining on the permsocks list,
1944 * it means we were asked to remove a listener.
1945 */
1946 if (!list_empty(&permsocks)) {
1947 list_splice_init(&permsocks, &serv->sv_permsocks);
1948 delete = true;
1949 }
1950 spin_unlock_bh(&serv->sv_lock);
1951
1952 /* Do not remove listeners while there are active threads. */
1953 if (serv->sv_nrthreads) {
1954 err = -EBUSY;
1955 goto out_unlock_mtx;
1956 }
1957
1958 /*
1959 * Since we can't delete an arbitrary llist entry, destroy the
1960 * remaining listeners and recreate the list.
1961 */
1962 if (delete)
1963 svc_xprt_destroy_all(serv, net, false);
1964
1965 /* walk list of addrs again, open any that still don't exist */
1966 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_SOCK_ADDR, info->nlhdr,
1967 GENL_HDRLEN, rem) {
1968 struct nlattr *tb[NFSD_A_SOCK_MAX + 1];
1969 const char *xcl_name;
1970 struct sockaddr *sa;
1971 int ret;
1972
1973 if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr,
1974 nfsd_sock_nl_policy, info->extack) < 0)
1975 continue;
1976
1977 if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME])
1978 continue;
1979
1980 if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa))
1981 continue;
1982
1983 xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]);
1984 sa = nla_data(tb[NFSD_A_SOCK_ADDR]);
1985
1986 xprt = svc_find_listener(serv, xcl_name, net, sa);
1987 if (xprt) {
1988 if (delete)
1989 WARN_ONCE(1, "Transport type=%s already exists\n",
1990 xcl_name);
1991 svc_xprt_put(xprt);
1992 continue;
1993 }
1994
1995 ret = svc_xprt_create_from_sa(serv, xcl_name, net, sa, 0,
1996 get_current_cred());
1997 /* always save the latest error */
1998 if (ret < 0)
1999 err = ret;
2000 }
2001
2002 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
2003 nfsd_destroy_serv(net);
2004
2005 out_unlock_mtx:
2006 mutex_unlock(&nfsd_mutex);
2007
2008 return err;
2009 }
2010
2011 /**
2012 * nfsd_nl_listener_get_doit - get the nfs running listeners
2013 * @skb: reply buffer
2014 * @info: netlink metadata and command arguments
2015 *
2016 * Return 0 on success or a negative errno.
2017 */
nfsd_nl_listener_get_doit(struct sk_buff * skb,struct genl_info * info)2018 int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info)
2019 {
2020 struct svc_xprt *xprt;
2021 struct svc_serv *serv;
2022 struct nfsd_net *nn;
2023 void *hdr;
2024 int err;
2025
2026 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
2027 if (!skb)
2028 return -ENOMEM;
2029
2030 hdr = genlmsg_iput(skb, info);
2031 if (!hdr) {
2032 err = -EMSGSIZE;
2033 goto err_free_msg;
2034 }
2035
2036 mutex_lock(&nfsd_mutex);
2037 nn = net_generic(genl_info_net(info), nfsd_net_id);
2038
2039 /* no nfs server? Just send empty socket list */
2040 if (!nn->nfsd_serv)
2041 goto out_unlock_mtx;
2042
2043 serv = nn->nfsd_serv;
2044 spin_lock_bh(&serv->sv_lock);
2045 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
2046 struct nlattr *attr;
2047
2048 attr = nla_nest_start(skb, NFSD_A_SERVER_SOCK_ADDR);
2049 if (!attr) {
2050 err = -EINVAL;
2051 goto err_serv_unlock;
2052 }
2053
2054 if (nla_put_string(skb, NFSD_A_SOCK_TRANSPORT_NAME,
2055 xprt->xpt_class->xcl_name) ||
2056 nla_put(skb, NFSD_A_SOCK_ADDR,
2057 sizeof(struct sockaddr_storage),
2058 &xprt->xpt_local)) {
2059 err = -EINVAL;
2060 goto err_serv_unlock;
2061 }
2062
2063 nla_nest_end(skb, attr);
2064 }
2065 spin_unlock_bh(&serv->sv_lock);
2066 out_unlock_mtx:
2067 mutex_unlock(&nfsd_mutex);
2068 genlmsg_end(skb, hdr);
2069
2070 return genlmsg_reply(skb, info);
2071
2072 err_serv_unlock:
2073 spin_unlock_bh(&serv->sv_lock);
2074 mutex_unlock(&nfsd_mutex);
2075 err_free_msg:
2076 nlmsg_free(skb);
2077
2078 return err;
2079 }
2080
2081 /**
2082 * nfsd_nl_pool_mode_set_doit - set the number of running threads
2083 * @skb: reply buffer
2084 * @info: netlink metadata and command arguments
2085 *
2086 * Return 0 on success or a negative errno.
2087 */
nfsd_nl_pool_mode_set_doit(struct sk_buff * skb,struct genl_info * info)2088 int nfsd_nl_pool_mode_set_doit(struct sk_buff *skb, struct genl_info *info)
2089 {
2090 const struct nlattr *attr;
2091
2092 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_POOL_MODE_MODE))
2093 return -EINVAL;
2094
2095 attr = info->attrs[NFSD_A_POOL_MODE_MODE];
2096 return sunrpc_set_pool_mode(nla_data(attr));
2097 }
2098
2099 /**
2100 * nfsd_nl_pool_mode_get_doit - get info about pool_mode
2101 * @skb: reply buffer
2102 * @info: netlink metadata and command arguments
2103 *
2104 * Return 0 on success or a negative errno.
2105 */
nfsd_nl_pool_mode_get_doit(struct sk_buff * skb,struct genl_info * info)2106 int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info)
2107 {
2108 struct net *net = genl_info_net(info);
2109 char buf[16];
2110 void *hdr;
2111 int err;
2112
2113 if (sunrpc_get_pool_mode(buf, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
2114 return -ERANGE;
2115
2116 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
2117 if (!skb)
2118 return -ENOMEM;
2119
2120 err = -EMSGSIZE;
2121 hdr = genlmsg_iput(skb, info);
2122 if (!hdr)
2123 goto err_free_msg;
2124
2125 err = nla_put_string(skb, NFSD_A_POOL_MODE_MODE, buf) |
2126 nla_put_u32(skb, NFSD_A_POOL_MODE_NPOOLS, nfsd_nrpools(net));
2127 if (err)
2128 goto err_free_msg;
2129
2130 genlmsg_end(skb, hdr);
2131 return genlmsg_reply(skb, info);
2132
2133 err_free_msg:
2134 nlmsg_free(skb);
2135 return err;
2136 }
2137
2138 /**
2139 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
2140 * @net: a freshly-created network namespace
2141 *
2142 * This information stays around as long as the network namespace is
2143 * alive whether or not there is an NFSD instance running in the
2144 * namespace.
2145 *
2146 * Returns zero on success, or a negative errno otherwise.
2147 */
nfsd_net_init(struct net * net)2148 static __net_init int nfsd_net_init(struct net *net)
2149 {
2150 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2151 int retval;
2152 int i;
2153
2154 retval = nfsd_export_init(net);
2155 if (retval)
2156 goto out_export_error;
2157 retval = nfsd_idmap_init(net);
2158 if (retval)
2159 goto out_idmap_error;
2160 retval = percpu_counter_init_many(nn->counter, 0, GFP_KERNEL,
2161 NFSD_STATS_COUNTERS_NUM);
2162 if (retval)
2163 goto out_repcache_error;
2164
2165 memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats));
2166 nn->nfsd_svcstats.program = &nfsd_programs[0];
2167 if (!nfsd_proc_stat_init(net)) {
2168 retval = -ENOMEM;
2169 goto out_proc_error;
2170 }
2171
2172 for (i = 0; i < sizeof(nn->nfsd_versions); i++)
2173 nn->nfsd_versions[i] = nfsd_support_version(i);
2174 for (i = 0; i < sizeof(nn->nfsd4_minorversions); i++)
2175 nn->nfsd4_minorversions[i] = nfsd_support_version(4);
2176 nn->nfsd_info.mutex = &nfsd_mutex;
2177 nn->nfsd_serv = NULL;
2178 nfsd4_init_leases_net(nn);
2179 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
2180 seqlock_init(&nn->writeverf_lock);
2181 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2182 spin_lock_init(&nn->local_clients_lock);
2183 INIT_LIST_HEAD(&nn->local_clients);
2184 #endif
2185 return 0;
2186
2187 out_proc_error:
2188 percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM);
2189 out_repcache_error:
2190 nfsd_idmap_shutdown(net);
2191 out_idmap_error:
2192 nfsd_export_shutdown(net);
2193 out_export_error:
2194 return retval;
2195 }
2196
2197 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2198 /**
2199 * nfsd_net_pre_exit - Disconnect localio clients from net namespace
2200 * @net: a network namespace that is about to be destroyed
2201 *
2202 * This invalidates ->net pointers held by localio clients
2203 * while they can still safely access nn->counter.
2204 */
nfsd_net_pre_exit(struct net * net)2205 static __net_exit void nfsd_net_pre_exit(struct net *net)
2206 {
2207 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2208
2209 nfs_localio_invalidate_clients(&nn->local_clients,
2210 &nn->local_clients_lock);
2211 }
2212 #endif
2213
2214 /**
2215 * nfsd_net_exit - Release the nfsd_net portion of a net namespace
2216 * @net: a network namespace that is about to be destroyed
2217 *
2218 */
nfsd_net_exit(struct net * net)2219 static __net_exit void nfsd_net_exit(struct net *net)
2220 {
2221 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2222
2223 nfsd_proc_stat_shutdown(net);
2224 percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM);
2225 nfsd_idmap_shutdown(net);
2226 nfsd_export_shutdown(net);
2227 }
2228
2229 static struct pernet_operations nfsd_net_ops = {
2230 .init = nfsd_net_init,
2231 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2232 .pre_exit = nfsd_net_pre_exit,
2233 #endif
2234 .exit = nfsd_net_exit,
2235 .id = &nfsd_net_id,
2236 .size = sizeof(struct nfsd_net),
2237 };
2238
init_nfsd(void)2239 static int __init init_nfsd(void)
2240 {
2241 int retval;
2242
2243 nfsd_debugfs_init();
2244
2245 retval = nfsd4_init_slabs();
2246 if (retval)
2247 return retval;
2248 retval = nfsd4_init_pnfs();
2249 if (retval)
2250 goto out_free_slabs;
2251 retval = nfsd_drc_slab_create();
2252 if (retval)
2253 goto out_free_pnfs;
2254 nfsd_lockd_init(); /* lockd->nfsd callbacks */
2255 retval = register_pernet_subsys(&nfsd_net_ops);
2256 if (retval < 0)
2257 goto out_free_lockd;
2258 retval = register_cld_notifier();
2259 if (retval)
2260 goto out_free_subsys;
2261 retval = nfsd4_create_laundry_wq();
2262 if (retval)
2263 goto out_free_cld;
2264 retval = register_filesystem(&nfsd_fs_type);
2265 if (retval)
2266 goto out_free_nfsd4;
2267 retval = genl_register_family(&nfsd_nl_family);
2268 if (retval)
2269 goto out_free_filesystem;
2270 retval = create_proc_exports_entry();
2271 if (retval)
2272 goto out_free_all;
2273 nfsd_localio_ops_init();
2274
2275 return 0;
2276 out_free_all:
2277 genl_unregister_family(&nfsd_nl_family);
2278 out_free_filesystem:
2279 unregister_filesystem(&nfsd_fs_type);
2280 out_free_nfsd4:
2281 nfsd4_destroy_laundry_wq();
2282 out_free_cld:
2283 unregister_cld_notifier();
2284 out_free_subsys:
2285 unregister_pernet_subsys(&nfsd_net_ops);
2286 out_free_lockd:
2287 nfsd_lockd_shutdown();
2288 nfsd_drc_slab_free();
2289 out_free_pnfs:
2290 nfsd4_exit_pnfs();
2291 out_free_slabs:
2292 nfsd4_free_slabs();
2293 nfsd_debugfs_exit();
2294 return retval;
2295 }
2296
exit_nfsd(void)2297 static void __exit exit_nfsd(void)
2298 {
2299 remove_proc_entry("fs/nfs/exports", NULL);
2300 remove_proc_entry("fs/nfs", NULL);
2301 genl_unregister_family(&nfsd_nl_family);
2302 unregister_filesystem(&nfsd_fs_type);
2303 nfsd4_destroy_laundry_wq();
2304 unregister_cld_notifier();
2305 unregister_pernet_subsys(&nfsd_net_ops);
2306 nfsd_drc_slab_free();
2307 nfsd_lockd_shutdown();
2308 nfsd4_free_slabs();
2309 nfsd4_exit_pnfs();
2310 nfsd_debugfs_exit();
2311 }
2312
2313 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2314 MODULE_DESCRIPTION("In-kernel NFS server");
2315 MODULE_LICENSE("GPL");
2316 module_init(init_nfsd)
2317 module_exit(exit_nfsd)
2318