fs/nfsd/nfsctl.c

   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 (*const 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, "0\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                         if (!nn->nfsd_serv)
1130                                 return -EBUSY;
1131                         nfsd4_end_grace(nn);
1132                         break;
1133                 default:
1134                         return -EINVAL;
1135                 }
1136         }
1137
1138         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1139                          nn->grace_ended ? 'Y' : 'N');
1140 }
1141
1142 #endif
1143
1144 /*----------------------------------------------------------------------------*/
1145 /*
1146  *      populating the filesystem.
1147  */
1148
1149 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1150 {
1151         static const struct tree_descr nfsd_files[] = {
1152                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1153                 [NFSD_Export_features] = {"export_features",
1154                                         &export_features_operations, S_IRUGO},
1155                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1156                                         &transaction_ops, S_IWUSR|S_IRUSR},
1157                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1158                                         &transaction_ops, S_IWUSR|S_IRUSR},
1159                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1160                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1161                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1162                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1163                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1164                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1165                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1166                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1167                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1168 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1169                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1170 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1171 #ifdef CONFIG_NFSD_V4
1172                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1173                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1174                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1175                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1176 #endif
1177                 /* last one */ {""}
1178         };
1179         get_net(sb->s_fs_info);
1180         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1181 }
1182
1183 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1184         int flags, const char *dev_name, void *data)
1185 {
1186         struct net *net = current->nsproxy->net_ns;
1187         return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1188 }
1189
1190 static void nfsd_umount(struct super_block *sb)
1191 {
1192         struct net *net = sb->s_fs_info;
1193
1194         kill_litter_super(sb);
1195         put_net(net);
1196 }
1197
1198 static struct file_system_type nfsd_fs_type = {
1199         .owner          = THIS_MODULE,
1200         .name           = "nfsd",
1201         .mount          = nfsd_mount,
1202         .kill_sb        = nfsd_umount,
1203 };
1204 MODULE_ALIAS_FS("nfsd");
1205
1206 #ifdef CONFIG_PROC_FS
1207 static int create_proc_exports_entry(void)
1208 {
1209         struct proc_dir_entry *entry;
1210
1211         entry = proc_mkdir("fs/nfs", NULL);
1212         if (!entry)
1213                 return -ENOMEM;
1214         entry = proc_create("exports", 0, entry,
1215                                  &exports_proc_operations);
1216         if (!entry) {
1217                 remove_proc_entry("fs/nfs", NULL);
1218                 return -ENOMEM;
1219         }
1220         return 0;
1221 }
1222 #else /* CONFIG_PROC_FS */
1223 static int create_proc_exports_entry(void)
1224 {
1225         return 0;
1226 }
1227 #endif
1228
1229 unsigned int nfsd_net_id;
1230
1231 static __net_init int nfsd_init_net(struct net *net)
1232 {
1233         int retval;
1234         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1235
1236         retval = nfsd_export_init(net);
1237         if (retval)
1238                 goto out_export_error;
1239         retval = nfsd_idmap_init(net);
1240         if (retval)
1241                 goto out_idmap_error;
1242         nn->nfsd4_lease = 90;   /* default lease time */
1243         nn->nfsd4_grace = 90;
1244         nn->somebody_reclaimed = false;
1245         nn->clverifier_counter = prandom_u32();
1246         nn->clientid_counter = prandom_u32();
1247
1248         atomic_set(&nn->ntf_refcnt, 0);
1249         init_waitqueue_head(&nn->ntf_wq);
1250         return 0;
1251
1252 out_idmap_error:
1253         nfsd_export_shutdown(net);
1254 out_export_error:
1255         return retval;
1256 }
1257
1258 static __net_exit void nfsd_exit_net(struct net *net)
1259 {
1260         nfsd_idmap_shutdown(net);
1261         nfsd_export_shutdown(net);
1262 }
1263
1264 static struct pernet_operations nfsd_net_ops = {
1265         .init = nfsd_init_net,
1266         .exit = nfsd_exit_net,
1267         .id   = &nfsd_net_id,
1268         .size = sizeof(struct nfsd_net),
1269 };
1270
1271 static int __init init_nfsd(void)
1272 {
1273         int retval;
1274         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1275
1276         retval = register_pernet_subsys(&nfsd_net_ops);
1277         if (retval < 0)
1278                 return retval;
1279         retval = register_cld_notifier();
1280         if (retval)
1281                 goto out_unregister_pernet;
1282         retval = nfsd4_init_slabs();
1283         if (retval)
1284                 goto out_unregister_notifier;
1285         retval = nfsd4_init_pnfs();
1286         if (retval)
1287                 goto out_free_slabs;
1288         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1289         if (retval)
1290                 goto out_exit_pnfs;
1291         nfsd_stat_init();       /* Statistics */
1292         retval = nfsd_reply_cache_init();
1293         if (retval)
1294                 goto out_free_stat;
1295         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1296         retval = create_proc_exports_entry();
1297         if (retval)
1298                 goto out_free_lockd;
1299         retval = register_filesystem(&nfsd_fs_type);
1300         if (retval)
1301                 goto out_free_all;
1302         return 0;
1303 out_free_all:
1304         remove_proc_entry("fs/nfs/exports", NULL);
1305         remove_proc_entry("fs/nfs", NULL);
1306 out_free_lockd:
1307         nfsd_lockd_shutdown();
1308         nfsd_reply_cache_shutdown();
1309 out_free_stat:
1310         nfsd_stat_shutdown();
1311         nfsd_fault_inject_cleanup();
1312 out_exit_pnfs:
1313         nfsd4_exit_pnfs();
1314 out_free_slabs:
1315         nfsd4_free_slabs();
1316 out_unregister_notifier:
1317         unregister_cld_notifier();
1318 out_unregister_pernet:
1319         unregister_pernet_subsys(&nfsd_net_ops);
1320         return retval;
1321 }
1322
1323 static void __exit exit_nfsd(void)
1324 {
1325         nfsd_reply_cache_shutdown();
1326         remove_proc_entry("fs/nfs/exports", NULL);
1327         remove_proc_entry("fs/nfs", NULL);
1328         nfsd_stat_shutdown();
1329         nfsd_lockd_shutdown();
1330         nfsd4_free_slabs();
1331         nfsd4_exit_pnfs();
1332         nfsd_fault_inject_cleanup();
1333         unregister_filesystem(&nfsd_fs_type);
1334         unregister_cld_notifier();
1335         unregister_pernet_subsys(&nfsd_net_ops);
1336 }
1337
1338 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1339 MODULE_LICENSE("GPL");
1340 module_init(init_nfsd)
1341 module_exit(exit_nfsd)