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TOMOYO Linux Cross Reference
Linux/fs/nfsd/nfsctl.c

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  1 /*
  2  * Syscall interface to knfsd.
  3  *
  4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  5  */
  6 
  7 #include <linux/slab.h>
  8 #include <linux/namei.h>
  9 #include <linux/ctype.h>
 10 
 11 #include <linux/sunrpc/svcsock.h>
 12 #include <linux/lockd/lockd.h>
 13 #include <linux/sunrpc/addr.h>
 14 #include <linux/sunrpc/gss_api.h>
 15 #include <linux/sunrpc/gss_krb5_enctypes.h>
 16 #include <linux/sunrpc/rpc_pipe_fs.h>
 17 #include <linux/module.h>
 18 
 19 #include "idmap.h"
 20 #include "nfsd.h"
 21 #include "cache.h"
 22 #include "state.h"
 23 #include "netns.h"
 24 #include "pnfs.h"
 25 
 26 /*
 27  *      We have a single directory with several nodes in it.
 28  */
 29 enum {
 30         NFSD_Root = 1,
 31         NFSD_List,
 32         NFSD_Export_features,
 33         NFSD_Fh,
 34         NFSD_FO_UnlockIP,
 35         NFSD_FO_UnlockFS,
 36         NFSD_Threads,
 37         NFSD_Pool_Threads,
 38         NFSD_Pool_Stats,
 39         NFSD_Reply_Cache_Stats,
 40         NFSD_Versions,
 41         NFSD_Ports,
 42         NFSD_MaxBlkSize,
 43         NFSD_MaxConnections,
 44         NFSD_SupportedEnctypes,
 45         /*
 46          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
 47          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
 48          */
 49 #ifdef CONFIG_NFSD_V4
 50         NFSD_Leasetime,
 51         NFSD_Gracetime,
 52         NFSD_RecoveryDir,
 53         NFSD_V4EndGrace,
 54 #endif
 55 };
 56 
 57 /*
 58  * write() for these nodes.
 59  */
 60 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
 61 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
 62 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
 63 static ssize_t write_threads(struct file *file, char *buf, size_t size);
 64 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
 65 static ssize_t write_versions(struct file *file, char *buf, size_t size);
 66 static ssize_t write_ports(struct file *file, char *buf, size_t size);
 67 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
 68 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
 69 #ifdef CONFIG_NFSD_V4
 70 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
 71 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
 72 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
 73 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
 74 #endif
 75 
 76 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 77         [NFSD_Fh] = write_filehandle,
 78         [NFSD_FO_UnlockIP] = write_unlock_ip,
 79         [NFSD_FO_UnlockFS] = write_unlock_fs,
 80         [NFSD_Threads] = write_threads,
 81         [NFSD_Pool_Threads] = write_pool_threads,
 82         [NFSD_Versions] = write_versions,
 83         [NFSD_Ports] = write_ports,
 84         [NFSD_MaxBlkSize] = write_maxblksize,
 85         [NFSD_MaxConnections] = write_maxconn,
 86 #ifdef CONFIG_NFSD_V4
 87         [NFSD_Leasetime] = write_leasetime,
 88         [NFSD_Gracetime] = write_gracetime,
 89         [NFSD_RecoveryDir] = write_recoverydir,
 90         [NFSD_V4EndGrace] = write_v4_end_grace,
 91 #endif
 92 };
 93 
 94 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 95 {
 96         ino_t ino =  file_inode(file)->i_ino;
 97         char *data;
 98         ssize_t rv;
 99 
100         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
101                 return -EINVAL;
102 
103         data = simple_transaction_get(file, buf, size);
104         if (IS_ERR(data))
105                 return PTR_ERR(data);
106 
107         rv =  write_op[ino](file, data, size);
108         if (rv >= 0) {
109                 simple_transaction_set(file, rv);
110                 rv = size;
111         }
112         return rv;
113 }
114 
115 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
116 {
117         if (! file->private_data) {
118                 /* An attempt to read a transaction file without writing
119                  * causes a 0-byte write so that the file can return
120                  * state information
121                  */
122                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
123                 if (rv < 0)
124                         return rv;
125         }
126         return simple_transaction_read(file, buf, size, pos);
127 }
128 
129 static const struct file_operations transaction_ops = {
130         .write          = nfsctl_transaction_write,
131         .read           = nfsctl_transaction_read,
132         .release        = simple_transaction_release,
133         .llseek         = default_llseek,
134 };
135 
136 static int exports_net_open(struct net *net, struct file *file)
137 {
138         int err;
139         struct seq_file *seq;
140         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
141 
142         err = seq_open(file, &nfs_exports_op);
143         if (err)
144                 return err;
145 
146         seq = file->private_data;
147         seq->private = nn->svc_export_cache;
148         return 0;
149 }
150 
151 static int exports_proc_open(struct inode *inode, struct file *file)
152 {
153         return exports_net_open(current->nsproxy->net_ns, file);
154 }
155 
156 static const struct file_operations exports_proc_operations = {
157         .open           = exports_proc_open,
158         .read           = seq_read,
159         .llseek         = seq_lseek,
160         .release        = seq_release,
161 };
162 
163 static int exports_nfsd_open(struct inode *inode, struct file *file)
164 {
165         return exports_net_open(inode->i_sb->s_fs_info, file);
166 }
167 
168 static const struct file_operations exports_nfsd_operations = {
169         .open           = exports_nfsd_open,
170         .read           = seq_read,
171         .llseek         = seq_lseek,
172         .release        = seq_release,
173 };
174 
175 static int export_features_show(struct seq_file *m, void *v)
176 {
177         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
178         return 0;
179 }
180 
181 static int export_features_open(struct inode *inode, struct file *file)
182 {
183         return single_open(file, export_features_show, NULL);
184 }
185 
186 static const struct file_operations export_features_operations = {
187         .open           = export_features_open,
188         .read           = seq_read,
189         .llseek         = seq_lseek,
190         .release        = single_release,
191 };
192 
193 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
194 static int supported_enctypes_show(struct seq_file *m, void *v)
195 {
196         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
197         return 0;
198 }
199 
200 static int supported_enctypes_open(struct inode *inode, struct file *file)
201 {
202         return single_open(file, supported_enctypes_show, NULL);
203 }
204 
205 static const struct file_operations supported_enctypes_ops = {
206         .open           = supported_enctypes_open,
207         .read           = seq_read,
208         .llseek         = seq_lseek,
209         .release        = single_release,
210 };
211 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
212 
213 static const struct file_operations pool_stats_operations = {
214         .open           = nfsd_pool_stats_open,
215         .read           = seq_read,
216         .llseek         = seq_lseek,
217         .release        = nfsd_pool_stats_release,
218 };
219 
220 static const struct file_operations reply_cache_stats_operations = {
221         .open           = nfsd_reply_cache_stats_open,
222         .read           = seq_read,
223         .llseek         = seq_lseek,
224         .release        = single_release,
225 };
226 
227 /*----------------------------------------------------------------------------*/
228 /*
229  * payload - write methods
230  */
231 
232 static inline struct net *netns(struct file *file)
233 {
234         return file_inode(file)->i_sb->s_fs_info;
235 }
236 
237 /**
238  * write_unlock_ip - Release all locks used by a client
239  *
240  * Experimental.
241  *
242  * Input:
243  *                      buf:    '\n'-terminated C string containing a
244  *                              presentation format IP address
245  *                      size:   length of C string in @buf
246  * Output:
247  *      On success:     returns zero if all specified locks were released;
248  *                      returns one if one or more locks were not released
249  *      On error:       return code is negative errno value
250  */
251 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
252 {
253         struct sockaddr_storage address;
254         struct sockaddr *sap = (struct sockaddr *)&address;
255         size_t salen = sizeof(address);
256         char *fo_path;
257         struct net *net = netns(file);
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 
270         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
271                 return -EINVAL;
272 
273         return nlmsvc_unlock_all_by_ip(sap);
274 }
275 
276 /**
277  * write_unlock_fs - Release all locks on a local file system
278  *
279  * Experimental.
280  *
281  * Input:
282  *                      buf:    '\n'-terminated C string containing the
283  *                              absolute pathname of a local file system
284  *                      size:   length of C string in @buf
285  * Output:
286  *      On success:     returns zero if all specified locks were released;
287  *                      returns one if one or more locks were not released
288  *      On error:       return code is negative errno value
289  */
290 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
291 {
292         struct path path;
293         char *fo_path;
294         int error;
295 
296         /* sanity check */
297         if (size == 0)
298                 return -EINVAL;
299 
300         if (buf[size-1] != '\n')
301                 return -EINVAL;
302 
303         fo_path = buf;
304         if (qword_get(&buf, fo_path, size) < 0)
305                 return -EINVAL;
306 
307         error = kern_path(fo_path, 0, &path);
308         if (error)
309                 return error;
310 
311         /*
312          * XXX: Needs better sanity checking.  Otherwise we could end up
313          * releasing locks on the wrong file system.
314          *
315          * For example:
316          * 1.  Does the path refer to a directory?
317          * 2.  Is that directory a mount point, or
318          * 3.  Is that directory the root of an exported file system?
319          */
320         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
321 
322         path_put(&path);
323         return error;
324 }
325 
326 /**
327  * write_filehandle - Get a variable-length NFS file handle by path
328  *
329  * On input, the buffer contains a '\n'-terminated C string comprised of
330  * three alphanumeric words separated by whitespace.  The string may
331  * contain escape sequences.
332  *
333  * Input:
334  *                      buf:
335  *                              domain:         client domain name
336  *                              path:           export pathname
337  *                              maxsize:        numeric maximum size of
338  *                                              @buf
339  *                      size:   length of C string in @buf
340  * Output:
341  *      On success:     passed-in buffer filled with '\n'-terminated C
342  *                      string containing a ASCII hex text version
343  *                      of the NFS file handle;
344  *                      return code is the size in bytes of the string
345  *      On error:       return code is negative errno value
346  */
347 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
348 {
349         char *dname, *path;
350         int uninitialized_var(maxsize);
351         char *mesg = buf;
352         int len;
353         struct auth_domain *dom;
354         struct knfsd_fh fh;
355 
356         if (size == 0)
357                 return -EINVAL;
358 
359         if (buf[size-1] != '\n')
360                 return -EINVAL;
361         buf[size-1] = 0;
362 
363         dname = mesg;
364         len = qword_get(&mesg, dname, size);
365         if (len <= 0)
366                 return -EINVAL;
367         
368         path = dname+len+1;
369         len = qword_get(&mesg, path, size);
370         if (len <= 0)
371                 return -EINVAL;
372 
373         len = get_int(&mesg, &maxsize);
374         if (len)
375                 return len;
376 
377         if (maxsize < NFS_FHSIZE)
378                 return -EINVAL;
379         maxsize = min(maxsize, NFS3_FHSIZE);
380 
381         if (qword_get(&mesg, mesg, size)>0)
382                 return -EINVAL;
383 
384         /* we have all the words, they are in buf.. */
385         dom = unix_domain_find(dname);
386         if (!dom)
387                 return -ENOMEM;
388 
389         len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
390         auth_domain_put(dom);
391         if (len)
392                 return len;
393         
394         mesg = buf;
395         len = SIMPLE_TRANSACTION_LIMIT;
396         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
397         mesg[-1] = '\n';
398         return mesg - buf;      
399 }
400 
401 /**
402  * write_threads - Start NFSD, or report the current number of running threads
403  *
404  * Input:
405  *                      buf:            ignored
406  *                      size:           zero
407  * Output:
408  *      On success:     passed-in buffer filled with '\n'-terminated C
409  *                      string numeric value representing the number of
410  *                      running NFSD threads;
411  *                      return code is the size in bytes of the string
412  *      On error:       return code is zero
413  *
414  * OR
415  *
416  * Input:
417  *                      buf:            C string containing an unsigned
418  *                                      integer value representing the
419  *                                      number of NFSD threads to start
420  *                      size:           non-zero length of C string in @buf
421  * Output:
422  *      On success:     NFS service is started;
423  *                      passed-in buffer filled with '\n'-terminated C
424  *                      string numeric value representing the number of
425  *                      running NFSD threads;
426  *                      return code is the size in bytes of the string
427  *      On error:       return code is zero or a negative errno value
428  */
429 static ssize_t write_threads(struct file *file, char *buf, size_t size)
430 {
431         char *mesg = buf;
432         int rv;
433         struct net *net = netns(file);
434 
435         if (size > 0) {
436                 int newthreads;
437                 rv = get_int(&mesg, &newthreads);
438                 if (rv)
439                         return rv;
440                 if (newthreads < 0)
441                         return -EINVAL;
442                 rv = nfsd_svc(newthreads, net);
443                 if (rv < 0)
444                         return rv;
445         } else
446                 rv = nfsd_nrthreads(net);
447 
448         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
449 }
450 
451 /**
452  * write_pool_threads - Set or report the current number of threads per pool
453  *
454  * Input:
455  *                      buf:            ignored
456  *                      size:           zero
457  *
458  * OR
459  *
460  * Input:
461  *                      buf:            C string containing whitespace-
462  *                                      separated unsigned integer values
463  *                                      representing the number of NFSD
464  *                                      threads to start in each pool
465  *                      size:           non-zero length of C string in @buf
466  * Output:
467  *      On success:     passed-in buffer filled with '\n'-terminated C
468  *                      string containing integer values representing the
469  *                      number of NFSD threads in each pool;
470  *                      return code is the size in bytes of the string
471  *      On error:       return code is zero or a negative errno value
472  */
473 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
474 {
475         /* if size > 0, look for an array of number of threads per node
476          * and apply them  then write out number of threads per node as reply
477          */
478         char *mesg = buf;
479         int i;
480         int rv;
481         int len;
482         int npools;
483         int *nthreads;
484         struct net *net = netns(file);
485 
486         mutex_lock(&nfsd_mutex);
487         npools = nfsd_nrpools(net);
488         if (npools == 0) {
489                 /*
490                  * NFS is shut down.  The admin can start it by
491                  * writing to the threads file but NOT the pool_threads
492                  * file, sorry.  Report zero threads.
493                  */
494                 mutex_unlock(&nfsd_mutex);
495                 strcpy(buf, "\n");
496                 return strlen(buf);
497         }
498 
499         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
500         rv = -ENOMEM;
501         if (nthreads == NULL)
502                 goto out_free;
503 
504         if (size > 0) {
505                 for (i = 0; i < npools; i++) {
506                         rv = get_int(&mesg, &nthreads[i]);
507                         if (rv == -ENOENT)
508                                 break;          /* fewer numbers than pools */
509                         if (rv)
510                                 goto out_free;  /* syntax error */
511                         rv = -EINVAL;
512                         if (nthreads[i] < 0)
513                                 goto out_free;
514                 }
515                 rv = nfsd_set_nrthreads(i, nthreads, net);
516                 if (rv)
517                         goto out_free;
518         }
519 
520         rv = nfsd_get_nrthreads(npools, nthreads, net);
521         if (rv)
522                 goto out_free;
523 
524         mesg = buf;
525         size = SIMPLE_TRANSACTION_LIMIT;
526         for (i = 0; i < npools && size > 0; i++) {
527                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
528                 len = strlen(mesg);
529                 size -= len;
530                 mesg += len;
531         }
532         rv = mesg - buf;
533 out_free:
534         kfree(nthreads);
535         mutex_unlock(&nfsd_mutex);
536         return rv;
537 }
538 
539 static ssize_t
540 nfsd_print_version_support(char *buf, int remaining, const char *sep,
541                 unsigned vers, int minor)
542 {
543         const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
544         bool supported = !!nfsd_vers(vers, NFSD_TEST);
545 
546         if (vers == 4 && minor >= 0 &&
547             !nfsd_minorversion(minor, NFSD_TEST))
548                 supported = false;
549         if (minor == 0 && supported)
550                 /*
551                  * special case for backward compatability.
552                  * +4.0 is never reported, it is implied by
553                  * +4, unless -4.0 is present.
554                  */
555                 return 0;
556         return snprintf(buf, remaining, format, sep,
557                         supported ? '+' : '-', vers, minor);
558 }
559 
560 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
561 {
562         char *mesg = buf;
563         char *vers, *minorp, sign;
564         int len, num, remaining;
565         ssize_t tlen = 0;
566         char *sep;
567         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
568 
569         if (size>0) {
570                 if (nn->nfsd_serv)
571                         /* Cannot change versions without updating
572                          * nn->nfsd_serv->sv_xdrsize, and reallocing
573                          * rq_argp and rq_resp
574                          */
575                         return -EBUSY;
576                 if (buf[size-1] != '\n')
577                         return -EINVAL;
578                 buf[size-1] = 0;
579 
580                 vers = mesg;
581                 len = qword_get(&mesg, vers, size);
582                 if (len <= 0) return -EINVAL;
583                 do {
584                         enum vers_op cmd;
585                         unsigned minor;
586                         sign = *vers;
587                         if (sign == '+' || sign == '-')
588                                 num = simple_strtol((vers+1), &minorp, 0);
589                         else
590                                 num = simple_strtol(vers, &minorp, 0);
591                         if (*minorp == '.') {
592                                 if (num != 4)
593                                         return -EINVAL;
594                                 if (kstrtouint(minorp+1, 0, &minor) < 0)
595                                         return -EINVAL;
596                         }
597 
598                         cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
599                         switch(num) {
600                         case 2:
601                         case 3:
602                                 nfsd_vers(num, cmd);
603                                 break;
604                         case 4:
605                                 if (*minorp == '.') {
606                                         if (nfsd_minorversion(minor, cmd) < 0)
607                                                 return -EINVAL;
608                                 } else if ((cmd == NFSD_SET) != nfsd_vers(num, NFSD_TEST)) {
609                                         /*
610                                          * Either we have +4 and no minors are enabled,
611                                          * or we have -4 and at least one minor is enabled.
612                                          * In either case, propagate 'cmd' to all minors.
613                                          */
614                                         minor = 0;
615                                         while (nfsd_minorversion(minor, cmd) >= 0)
616                                                 minor++;
617                                 }
618                                 break;
619                         default:
620                                 return -EINVAL;
621                         }
622                         vers += len + 1;
623                 } while ((len = qword_get(&mesg, vers, size)) > 0);
624                 /* If all get turned off, turn them back on, as
625                  * having no versions is BAD
626                  */
627                 nfsd_reset_versions();
628         }
629 
630         /* Now write current state into reply buffer */
631         len = 0;
632         sep = "";
633         remaining = SIMPLE_TRANSACTION_LIMIT;
634         for (num=2 ; num <= 4 ; num++) {
635                 int minor;
636                 if (!nfsd_vers(num, NFSD_AVAIL))
637                         continue;
638 
639                 minor = -1;
640                 do {
641                         len = nfsd_print_version_support(buf, remaining,
642                                         sep, num, minor);
643                         if (len >= remaining)
644                                 goto out;
645                         remaining -= len;
646                         buf += len;
647                         tlen += len;
648                         minor++;
649                         if (len)
650                                 sep = " ";
651                 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
652         }
653 out:
654         len = snprintf(buf, remaining, "\n");
655         if (len >= remaining)
656                 return -EINVAL;
657         return tlen + len;
658 }
659 
660 /**
661  * write_versions - Set or report the available NFS protocol versions
662  *
663  * Input:
664  *                      buf:            ignored
665  *                      size:           zero
666  * Output:
667  *      On success:     passed-in buffer filled with '\n'-terminated C
668  *                      string containing positive or negative integer
669  *                      values representing the current status of each
670  *                      protocol version;
671  *                      return code is the size in bytes of the string
672  *      On error:       return code is zero or a negative errno value
673  *
674  * OR
675  *
676  * Input:
677  *                      buf:            C string containing whitespace-
678  *                                      separated positive or negative
679  *                                      integer values representing NFS
680  *                                      protocol versions to enable ("+n")
681  *                                      or disable ("-n")
682  *                      size:           non-zero length of C string in @buf
683  * Output:
684  *      On success:     status of zero or more protocol versions has
685  *                      been updated; passed-in buffer filled with
686  *                      '\n'-terminated C string containing positive
687  *                      or negative integer values representing the
688  *                      current status of each protocol version;
689  *                      return code is the size in bytes of the string
690  *      On error:       return code is zero or a negative errno value
691  */
692 static ssize_t write_versions(struct file *file, char *buf, size_t size)
693 {
694         ssize_t rv;
695 
696         mutex_lock(&nfsd_mutex);
697         rv = __write_versions(file, buf, size);
698         mutex_unlock(&nfsd_mutex);
699         return rv;
700 }
701 
702 /*
703  * Zero-length write.  Return a list of NFSD's current listener
704  * transports.
705  */
706 static ssize_t __write_ports_names(char *buf, struct net *net)
707 {
708         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
709 
710         if (nn->nfsd_serv == NULL)
711                 return 0;
712         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
713 }
714 
715 /*
716  * A single 'fd' number was written, in which case it must be for
717  * a socket of a supported family/protocol, and we use it as an
718  * nfsd listener.
719  */
720 static ssize_t __write_ports_addfd(char *buf, struct net *net)
721 {
722         char *mesg = buf;
723         int fd, err;
724         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
725 
726         err = get_int(&mesg, &fd);
727         if (err != 0 || fd < 0)
728                 return -EINVAL;
729 
730         if (svc_alien_sock(net, fd)) {
731                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
732                 return -EINVAL;
733         }
734 
735         err = nfsd_create_serv(net);
736         if (err != 0)
737                 return err;
738 
739         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
740         if (err < 0) {
741                 nfsd_destroy(net);
742                 return err;
743         }
744 
745         /* Decrease the count, but don't shut down the service */
746         nn->nfsd_serv->sv_nrthreads--;
747         return err;
748 }
749 
750 /*
751  * A transport listener is added by writing it's transport name and
752  * a port number.
753  */
754 static ssize_t __write_ports_addxprt(char *buf, struct net *net)
755 {
756         char transport[16];
757         struct svc_xprt *xprt;
758         int port, err;
759         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
760 
761         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
762                 return -EINVAL;
763 
764         if (port < 1 || port > USHRT_MAX)
765                 return -EINVAL;
766 
767         err = nfsd_create_serv(net);
768         if (err != 0)
769                 return err;
770 
771         err = svc_create_xprt(nn->nfsd_serv, transport, net,
772                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
773         if (err < 0)
774                 goto out_err;
775 
776         err = svc_create_xprt(nn->nfsd_serv, transport, net,
777                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
778         if (err < 0 && err != -EAFNOSUPPORT)
779                 goto out_close;
780 
781         /* Decrease the count, but don't shut down the service */
782         nn->nfsd_serv->sv_nrthreads--;
783         return 0;
784 out_close:
785         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
786         if (xprt != NULL) {
787                 svc_close_xprt(xprt);
788                 svc_xprt_put(xprt);
789         }
790 out_err:
791         nfsd_destroy(net);
792         return err;
793 }
794 
795 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
796                              struct net *net)
797 {
798         if (size == 0)
799                 return __write_ports_names(buf, net);
800 
801         if (isdigit(buf[0]))
802                 return __write_ports_addfd(buf, net);
803 
804         if (isalpha(buf[0]))
805                 return __write_ports_addxprt(buf, net);
806 
807         return -EINVAL;
808 }
809 
810 /**
811  * write_ports - Pass a socket file descriptor or transport name to listen on
812  *
813  * Input:
814  *                      buf:            ignored
815  *                      size:           zero
816  * Output:
817  *      On success:     passed-in buffer filled with a '\n'-terminated C
818  *                      string containing a whitespace-separated list of
819  *                      named NFSD listeners;
820  *                      return code is the size in bytes of the string
821  *      On error:       return code is zero or a negative errno value
822  *
823  * OR
824  *
825  * Input:
826  *                      buf:            C string containing an unsigned
827  *                                      integer value representing a bound
828  *                                      but unconnected socket that is to be
829  *                                      used as an NFSD listener; listen(3)
830  *                                      must be called for a SOCK_STREAM
831  *                                      socket, otherwise it is ignored
832  *                      size:           non-zero length of C string in @buf
833  * Output:
834  *      On success:     NFS service is started;
835  *                      passed-in buffer filled with a '\n'-terminated C
836  *                      string containing a unique alphanumeric name of
837  *                      the listener;
838  *                      return code is the size in bytes of the string
839  *      On error:       return code is a negative errno value
840  *
841  * OR
842  *
843  * Input:
844  *                      buf:            C string containing a transport
845  *                                      name and an unsigned integer value
846  *                                      representing the port to listen on,
847  *                                      separated by whitespace
848  *                      size:           non-zero length of C string in @buf
849  * Output:
850  *      On success:     returns zero; NFS service is started
851  *      On error:       return code is a negative errno value
852  */
853 static ssize_t write_ports(struct file *file, char *buf, size_t size)
854 {
855         ssize_t rv;
856 
857         mutex_lock(&nfsd_mutex);
858         rv = __write_ports(file, buf, size, netns(file));
859         mutex_unlock(&nfsd_mutex);
860         return rv;
861 }
862 
863 
864 int nfsd_max_blksize;
865 
866 /**
867  * write_maxblksize - Set or report the current NFS blksize
868  *
869  * Input:
870  *                      buf:            ignored
871  *                      size:           zero
872  *
873  * OR
874  *
875  * Input:
876  *                      buf:            C string containing an unsigned
877  *                                      integer value representing the new
878  *                                      NFS blksize
879  *                      size:           non-zero length of C string in @buf
880  * Output:
881  *      On success:     passed-in buffer filled with '\n'-terminated C string
882  *                      containing numeric value of the current NFS blksize
883  *                      setting;
884  *                      return code is the size in bytes of the string
885  *      On error:       return code is zero or a negative errno value
886  */
887 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
888 {
889         char *mesg = buf;
890         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
891 
892         if (size > 0) {
893                 int bsize;
894                 int rv = get_int(&mesg, &bsize);
895                 if (rv)
896                         return rv;
897                 /* force bsize into allowed range and
898                  * required alignment.
899                  */
900                 bsize = max_t(int, bsize, 1024);
901                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
902                 bsize &= ~(1024-1);
903                 mutex_lock(&nfsd_mutex);
904                 if (nn->nfsd_serv) {
905                         mutex_unlock(&nfsd_mutex);
906                         return -EBUSY;
907                 }
908                 nfsd_max_blksize = bsize;
909                 mutex_unlock(&nfsd_mutex);
910         }
911 
912         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
913                                                         nfsd_max_blksize);
914 }
915 
916 /**
917  * write_maxconn - Set or report the current max number of connections
918  *
919  * Input:
920  *                      buf:            ignored
921  *                      size:           zero
922  * OR
923  *
924  * Input:
925  *                      buf:            C string containing an unsigned
926  *                                      integer value representing the new
927  *                                      number of max connections
928  *                      size:           non-zero length of C string in @buf
929  * Output:
930  *      On success:     passed-in buffer filled with '\n'-terminated C string
931  *                      containing numeric value of max_connections setting
932  *                      for this net namespace;
933  *                      return code is the size in bytes of the string
934  *      On error:       return code is zero or a negative errno value
935  */
936 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
937 {
938         char *mesg = buf;
939         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
940         unsigned int maxconn = nn->max_connections;
941 
942         if (size > 0) {
943                 int rv = get_uint(&mesg, &maxconn);
944 
945                 if (rv)
946                         return rv;
947                 nn->max_connections = maxconn;
948         }
949 
950         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
951 }
952 
953 #ifdef CONFIG_NFSD_V4
954 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
955                                   time_t *time, struct nfsd_net *nn)
956 {
957         char *mesg = buf;
958         int rv, i;
959 
960         if (size > 0) {
961                 if (nn->nfsd_serv)
962                         return -EBUSY;
963                 rv = get_int(&mesg, &i);
964                 if (rv)
965                         return rv;
966                 /*
967                  * Some sanity checking.  We don't have a reason for
968                  * these particular numbers, but problems with the
969                  * extremes are:
970                  *      - Too short: the briefest network outage may
971                  *        cause clients to lose all their locks.  Also,
972                  *        the frequent polling may be wasteful.
973                  *      - Too long: do you really want reboot recovery
974                  *        to take more than an hour?  Or to make other
975                  *        clients wait an hour before being able to
976                  *        revoke a dead client's locks?
977                  */
978                 if (i < 10 || i > 3600)
979                         return -EINVAL;
980                 *time = i;
981         }
982 
983         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
984 }
985 
986 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
987                                 time_t *time, struct nfsd_net *nn)
988 {
989         ssize_t rv;
990 
991         mutex_lock(&nfsd_mutex);
992         rv = __nfsd4_write_time(file, buf, size, time, nn);
993         mutex_unlock(&nfsd_mutex);
994         return rv;
995 }
996 
997 /**
998  * write_leasetime - Set or report the current NFSv4 lease time
999  *
1000  * Input:
1001  *                      buf:            ignored
1002  *                      size:           zero
1003  *
1004  * OR
1005  *
1006  * Input:
1007  *                      buf:            C string containing an unsigned
1008  *                                      integer value representing the new
1009  *                                      NFSv4 lease expiry time
1010  *                      size:           non-zero length of C string in @buf
1011  * Output:
1012  *      On success:     passed-in buffer filled with '\n'-terminated C
1013  *                      string containing unsigned integer value of the
1014  *                      current lease expiry time;
1015  *                      return code is the size in bytes of the string
1016  *      On error:       return code is zero or a negative errno value
1017  */
1018 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1019 {
1020         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1021         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1022 }
1023 
1024 /**
1025  * write_gracetime - Set or report current NFSv4 grace period time
1026  *
1027  * As above, but sets the time of the NFSv4 grace period.
1028  *
1029  * Note this should never be set to less than the *previous*
1030  * lease-period time, but we don't try to enforce this.  (In the common
1031  * case (a new boot), we don't know what the previous lease time was
1032  * anyway.)
1033  */
1034 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1035 {
1036         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1037         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1038 }
1039 
1040 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1041                                    struct nfsd_net *nn)
1042 {
1043         char *mesg = buf;
1044         char *recdir;
1045         int len, status;
1046 
1047         if (size > 0) {
1048                 if (nn->nfsd_serv)
1049                         return -EBUSY;
1050                 if (size > PATH_MAX || buf[size-1] != '\n')
1051                         return -EINVAL;
1052                 buf[size-1] = 0;
1053 
1054                 recdir = mesg;
1055                 len = qword_get(&mesg, recdir, size);
1056                 if (len <= 0)
1057                         return -EINVAL;
1058 
1059                 status = nfs4_reset_recoverydir(recdir);
1060                 if (status)
1061                         return status;
1062         }
1063 
1064         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1065                                                         nfs4_recoverydir());
1066 }
1067 
1068 /**
1069  * write_recoverydir - Set or report the pathname of the recovery directory
1070  *
1071  * Input:
1072  *                      buf:            ignored
1073  *                      size:           zero
1074  *
1075  * OR
1076  *
1077  * Input:
1078  *                      buf:            C string containing the pathname
1079  *                                      of the directory on a local file
1080  *                                      system containing permanent NFSv4
1081  *                                      recovery data
1082  *                      size:           non-zero length of C string in @buf
1083  * Output:
1084  *      On success:     passed-in buffer filled with '\n'-terminated C string
1085  *                      containing the current recovery pathname setting;
1086  *                      return code is the size in bytes of the string
1087  *      On error:       return code is zero or a negative errno value
1088  */
1089 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1090 {
1091         ssize_t rv;
1092         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1093 
1094         mutex_lock(&nfsd_mutex);
1095         rv = __write_recoverydir(file, buf, size, nn);
1096         mutex_unlock(&nfsd_mutex);
1097         return rv;
1098 }
1099 
1100 /**
1101  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1102  *
1103  * Input:
1104  *                      buf:            ignored
1105  *                      size:           zero
1106  * OR
1107  *
1108  * Input:
1109  *                      buf:            any value
1110  *                      size:           non-zero length of C string in @buf
1111  * Output:
1112  *                      passed-in buffer filled with "Y" or "N" with a newline
1113  *                      and NULL-terminated C string. This indicates whether
1114  *                      the grace period has ended in the current net
1115  *                      namespace. Return code is the size in bytes of the
1116  *                      string. Writing a string that starts with 'Y', 'y', or
1117  *                      '1' to the file will end the grace period for nfsd's v4
1118  *                      lock manager.
1119  */
1120 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1121 {
1122         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1123 
1124         if (size > 0) {
1125                 switch(buf[0]) {
1126                 case 'Y':
1127                 case 'y':
1128                 case '1':
1129                         nfsd4_end_grace(nn);
1130                         break;
1131                 default:
1132                         return -EINVAL;
1133                 }
1134         }
1135 
1136         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1137                          nn->grace_ended ? 'Y' : 'N');
1138 }
1139 
1140 #endif
1141 
1142 /*----------------------------------------------------------------------------*/
1143 /*
1144  *      populating the filesystem.
1145  */
1146 
1147 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1148 {
1149         static const struct tree_descr nfsd_files[] = {
1150                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1151                 [NFSD_Export_features] = {"export_features",
1152                                         &export_features_operations, S_IRUGO},
1153                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1154                                         &transaction_ops, S_IWUSR|S_IRUSR},
1155                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1156                                         &transaction_ops, S_IWUSR|S_IRUSR},
1157                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1158                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1159                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1160                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1161                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1162                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1163                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1164                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1165                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1166 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1167                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1168 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1169 #ifdef CONFIG_NFSD_V4
1170                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1171                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1172                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1173                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1174 #endif
1175                 /* last one */ {""}
1176         };
1177         get_net(sb->s_fs_info);
1178         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1179 }
1180 
1181 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1182         int flags, const char *dev_name, void *data)
1183 {
1184         struct net *net = current->nsproxy->net_ns;
1185         return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1186 }
1187 
1188 static void nfsd_umount(struct super_block *sb)
1189 {
1190         struct net *net = sb->s_fs_info;
1191 
1192         kill_litter_super(sb);
1193         put_net(net);
1194 }
1195 
1196 static struct file_system_type nfsd_fs_type = {
1197         .owner          = THIS_MODULE,
1198         .name           = "nfsd",
1199         .mount          = nfsd_mount,
1200         .kill_sb        = nfsd_umount,
1201 };
1202 MODULE_ALIAS_FS("nfsd");
1203 
1204 #ifdef CONFIG_PROC_FS
1205 static int create_proc_exports_entry(void)
1206 {
1207         struct proc_dir_entry *entry;
1208 
1209         entry = proc_mkdir("fs/nfs", NULL);
1210         if (!entry)
1211                 return -ENOMEM;
1212         entry = proc_create("exports", 0, entry,
1213                                  &exports_proc_operations);
1214         if (!entry) {
1215                 remove_proc_entry("fs/nfs", NULL);
1216                 return -ENOMEM;
1217         }
1218         return 0;
1219 }
1220 #else /* CONFIG_PROC_FS */
1221 static int create_proc_exports_entry(void)
1222 {
1223         return 0;
1224 }
1225 #endif
1226 
1227 unsigned int nfsd_net_id;
1228 
1229 static __net_init int nfsd_init_net(struct net *net)
1230 {
1231         int retval;
1232         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1233 
1234         retval = nfsd_export_init(net);
1235         if (retval)
1236                 goto out_export_error;
1237         retval = nfsd_idmap_init(net);
1238         if (retval)
1239                 goto out_idmap_error;
1240         nn->nfsd4_lease = 90;   /* default lease time */
1241         nn->nfsd4_grace = 90;
1242         nn->clverifier_counter = prandom_u32();
1243         nn->clientid_counter = prandom_u32();
1244         return 0;
1245 
1246 out_idmap_error:
1247         nfsd_export_shutdown(net);
1248 out_export_error:
1249         return retval;
1250 }
1251 
1252 static __net_exit void nfsd_exit_net(struct net *net)
1253 {
1254         nfsd_idmap_shutdown(net);
1255         nfsd_export_shutdown(net);
1256 }
1257 
1258 static struct pernet_operations nfsd_net_ops = {
1259         .init = nfsd_init_net,
1260         .exit = nfsd_exit_net,
1261         .id   = &nfsd_net_id,
1262         .size = sizeof(struct nfsd_net),
1263 };
1264 
1265 static int __init init_nfsd(void)
1266 {
1267         int retval;
1268         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1269 
1270         retval = register_pernet_subsys(&nfsd_net_ops);
1271         if (retval < 0)
1272                 return retval;
1273         retval = register_cld_notifier();
1274         if (retval)
1275                 goto out_unregister_pernet;
1276         retval = nfsd4_init_slabs();
1277         if (retval)
1278                 goto out_unregister_notifier;
1279         retval = nfsd4_init_pnfs();
1280         if (retval)
1281                 goto out_free_slabs;
1282         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1283         if (retval)
1284                 goto out_exit_pnfs;
1285         nfsd_stat_init();       /* Statistics */
1286         retval = nfsd_reply_cache_init();
1287         if (retval)
1288                 goto out_free_stat;
1289         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1290         retval = create_proc_exports_entry();
1291         if (retval)
1292                 goto out_free_lockd;
1293         retval = register_filesystem(&nfsd_fs_type);
1294         if (retval)
1295                 goto out_free_all;
1296         return 0;
1297 out_free_all:
1298         remove_proc_entry("fs/nfs/exports", NULL);
1299         remove_proc_entry("fs/nfs", NULL);
1300 out_free_lockd:
1301         nfsd_lockd_shutdown();
1302         nfsd_reply_cache_shutdown();
1303 out_free_stat:
1304         nfsd_stat_shutdown();
1305         nfsd_fault_inject_cleanup();
1306 out_exit_pnfs:
1307         nfsd4_exit_pnfs();
1308 out_free_slabs:
1309         nfsd4_free_slabs();
1310 out_unregister_notifier:
1311         unregister_cld_notifier();
1312 out_unregister_pernet:
1313         unregister_pernet_subsys(&nfsd_net_ops);
1314         return retval;
1315 }
1316 
1317 static void __exit exit_nfsd(void)
1318 {
1319         nfsd_reply_cache_shutdown();
1320         remove_proc_entry("fs/nfs/exports", NULL);
1321         remove_proc_entry("fs/nfs", NULL);
1322         nfsd_stat_shutdown();
1323         nfsd_lockd_shutdown();
1324         nfsd4_free_slabs();
1325         nfsd4_exit_pnfs();
1326         nfsd_fault_inject_cleanup();
1327         unregister_filesystem(&nfsd_fs_type);
1328         unregister_cld_notifier();
1329         unregister_pernet_subsys(&nfsd_net_ops);
1330 }
1331 
1332 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1333 MODULE_LICENSE("GPL");
1334 module_init(init_nfsd)
1335 module_exit(exit_nfsd)
1336 

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