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
  25 /*
  26  *      We have a single directory with several nodes in it.
  27  */
  28 enum {
  29         NFSD_Root = 1,
  30         NFSD_List,
  31         NFSD_Export_features,
  32         NFSD_Fh,
  33         NFSD_FO_UnlockIP,
  34         NFSD_FO_UnlockFS,
  35         NFSD_Threads,
  36         NFSD_Pool_Threads,
  37         NFSD_Pool_Stats,
  38         NFSD_Reply_Cache_Stats,
  39         NFSD_Versions,
  40         NFSD_Ports,
  41         NFSD_MaxBlkSize,
  42         NFSD_MaxConnections,
  43         NFSD_SupportedEnctypes,
  44         /*
  45          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  46          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  47          */
  48 #ifdef CONFIG_NFSD_V4
  49         NFSD_Leasetime,
  50         NFSD_Gracetime,
  51         NFSD_RecoveryDir,
  52         NFSD_V4EndGrace,
  53 #endif
  54 };
  55
  56 /*
  57  * write() for these nodes.
  58  */
  59 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  60 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
  61 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
  62 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  63 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
  64 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  65 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  66 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
  67 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
  68 #ifdef CONFIG_NFSD_V4
  69 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  70 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
  71 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  72 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
  73 #endif
  74
  75 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  76         [NFSD_Fh] = write_filehandle,
  77         [NFSD_FO_UnlockIP] = write_unlock_ip,
  78         [NFSD_FO_UnlockFS] = write_unlock_fs,
  79         [NFSD_Threads] = write_threads,
  80         [NFSD_Pool_Threads] = write_pool_threads,
  81         [NFSD_Versions] = write_versions,
  82         [NFSD_Ports] = write_ports,
  83         [NFSD_MaxBlkSize] = write_maxblksize,
  84         [NFSD_MaxConnections] = write_maxconn,
  85 #ifdef CONFIG_NFSD_V4
  86         [NFSD_Leasetime] = write_leasetime,
  87         [NFSD_Gracetime] = write_gracetime,
  88         [NFSD_RecoveryDir] = write_recoverydir,
  89         [NFSD_V4EndGrace] = write_v4_end_grace,
  90 #endif
  91 };
  92
  93 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
  94 {
  95         ino_t ino =  file_inode(file)->i_ino;
  96         char *data;
  97         ssize_t rv;
  98
  99         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 100                 return -EINVAL;
 101
 102         data = simple_transaction_get(file, buf, size);
 103         if (IS_ERR(data))
 104                 return PTR_ERR(data);
 105
 106         rv =  write_op[ino](file, data, size);
 107         if (rv >= 0) {
 108                 simple_transaction_set(file, rv);
 109                 rv = size;
 110         }
 111         return rv;
 112 }
 113
 114 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 115 {
 116         if (! file->private_data) {
 117                 /* An attempt to read a transaction file without writing
 118                  * causes a 0-byte write so that the file can return
 119                  * state information
 120                  */
 121                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 122                 if (rv < 0)
 123                         return rv;
 124         }
 125         return simple_transaction_read(file, buf, size, pos);
 126 }
 127
 128 static const struct file_operations transaction_ops = {
 129         .write          = nfsctl_transaction_write,
 130         .read           = nfsctl_transaction_read,
 131         .release        = simple_transaction_release,
 132         .llseek         = default_llseek,
 133 };
 134
 135 static int exports_net_open(struct net *net, struct file *file)
 136 {
 137         int err;
 138         struct seq_file *seq;
 139         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 140
 141         err = seq_open(file, &nfs_exports_op);
 142         if (err)
 143                 return err;
 144
 145         seq = file->private_data;
 146         seq->private = nn->svc_export_cache;
 147         return 0;
 148 }
 149
 150 static int exports_proc_open(struct inode *inode, struct file *file)
 151 {
 152         return exports_net_open(current->nsproxy->net_ns, file);
 153 }
 154
 155 static const struct file_operations exports_proc_operations = {
 156         .open           = exports_proc_open,
 157         .read           = seq_read,
 158         .llseek         = seq_lseek,
 159         .release        = seq_release,
 160         .owner          = THIS_MODULE,
 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         .owner          = THIS_MODULE,
 174 };
 175
 176 static int export_features_show(struct seq_file *m, void *v)
 177 {
 178         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
 179         return 0;
 180 }
 181
 182 static int export_features_open(struct inode *inode, struct file *file)
 183 {
 184         return single_open(file, export_features_show, NULL);
 185 }
 186
 187 static const struct file_operations export_features_operations = {
 188         .open           = export_features_open,
 189         .read           = seq_read,
 190         .llseek         = seq_lseek,
 191         .release        = single_release,
 192 };
 193
 194 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
 195 static int supported_enctypes_show(struct seq_file *m, void *v)
 196 {
 197         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
 198         return 0;
 199 }
 200
 201 static int supported_enctypes_open(struct inode *inode, struct file *file)
 202 {
 203         return single_open(file, supported_enctypes_show, NULL);
 204 }
 205
 206 static const struct file_operations supported_enctypes_ops = {
 207         .open           = supported_enctypes_open,
 208         .read           = seq_read,
 209         .llseek         = seq_lseek,
 210         .release        = single_release,
 211 };
 212 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
 213
 214 static const struct file_operations pool_stats_operations = {
 215         .open           = nfsd_pool_stats_open,
 216         .read           = seq_read,
 217         .llseek         = seq_lseek,
 218         .release        = nfsd_pool_stats_release,
 219         .owner          = THIS_MODULE,
 220 };
 221
 222 static struct file_operations reply_cache_stats_operations = {
 223         .open           = nfsd_reply_cache_stats_open,
 224         .read           = seq_read,
 225         .llseek         = seq_lseek,
 226         .release        = single_release,
 227 };
 228
 229 /*----------------------------------------------------------------------------*/
 230 /*
 231  * payload - write methods
 232  */
 233
 234
 235 /**
 236  * write_unlock_ip - Release all locks used by a client
 237  *
 238  * Experimental.
 239  *
 240  * Input:
 241  *                      buf:    '\n'-terminated C string containing a
 242  *                              presentation format IP address
 243  *                      size:   length of C string in @buf
 244  * Output:
 245  *      On success:     returns zero if all specified locks were released;
 246  *                      returns one if one or more locks were not released
 247  *      On error:       return code is negative errno value
 248  */
 249 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
 250 {
 251         struct sockaddr_storage address;
 252         struct sockaddr *sap = (struct sockaddr *)&address;
 253         size_t salen = sizeof(address);
 254         char *fo_path;
 255         struct net *net = file->f_dentry->d_sb->s_fs_info;
 256
 257         /* sanity check */
 258         if (size == 0)
 259                 return -EINVAL;
 260
 261         if (buf[size-1] != '\n')
 262                 return -EINVAL;
 263
 264         fo_path = buf;
 265         if (qword_get(&buf, fo_path, size) < 0)
 266                 return -EINVAL;
 267
 268         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
 269                 return -EINVAL;
 270
 271         return nlmsvc_unlock_all_by_ip(sap);
 272 }
 273
 274 /**
 275  * write_unlock_fs - Release all locks on a local file system
 276  *
 277  * Experimental.
 278  *
 279  * Input:
 280  *                      buf:    '\n'-terminated C string containing the
 281  *                              absolute pathname of a local file system
 282  *                      size:   length of C string in @buf
 283  * Output:
 284  *      On success:     returns zero if all specified locks were released;
 285  *                      returns one if one or more locks were not released
 286  *      On error:       return code is negative errno value
 287  */
 288 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
 289 {
 290         struct path path;
 291         char *fo_path;
 292         int error;
 293
 294         /* sanity check */
 295         if (size == 0)
 296                 return -EINVAL;
 297
 298         if (buf[size-1] != '\n')
 299                 return -EINVAL;
 300
 301         fo_path = buf;
 302         if (qword_get(&buf, fo_path, size) < 0)
 303                 return -EINVAL;
 304
 305         error = kern_path(fo_path, 0, &path);
 306         if (error)
 307                 return error;
 308
 309         /*
 310          * XXX: Needs better sanity checking.  Otherwise we could end up
 311          * releasing locks on the wrong file system.
 312          *
 313          * For example:
 314          * 1.  Does the path refer to a directory?
 315          * 2.  Is that directory a mount point, or
 316          * 3.  Is that directory the root of an exported file system?
 317          */
 318         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
 319
 320         path_put(&path);
 321         return error;
 322 }
 323
 324 /**
 325  * write_filehandle - Get a variable-length NFS file handle by path
 326  *
 327  * On input, the buffer contains a '\n'-terminated C string comprised of
 328  * three alphanumeric words separated by whitespace.  The string may
 329  * contain escape sequences.
 330  *
 331  * Input:
 332  *                      buf:
 333  *                              domain:         client domain name
 334  *                              path:           export pathname
 335  *                              maxsize:        numeric maximum size of
 336  *                                              @buf
 337  *                      size:   length of C string in @buf
 338  * Output:
 339  *      On success:     passed-in buffer filled with '\n'-terminated C
 340  *                      string containing a ASCII hex text version
 341  *                      of the NFS file handle;
 342  *                      return code is the size in bytes of the string
 343  *      On error:       return code is negative errno value
 344  */
 345 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 346 {
 347         char *dname, *path;
 348         int uninitialized_var(maxsize);
 349         char *mesg = buf;
 350         int len;
 351         struct auth_domain *dom;
 352         struct knfsd_fh fh;
 353         struct net *net = file->f_dentry->d_sb->s_fs_info;
 354
 355         if (size == 0)
 356                 return -EINVAL;
 357
 358         if (buf[size-1] != '\n')
 359                 return -EINVAL;
 360         buf[size-1] = 0;
 361
 362         dname = mesg;
 363         len = qword_get(&mesg, dname, size);
 364         if (len <= 0)
 365                 return -EINVAL;
 366
 367         path = dname+len+1;
 368         len = qword_get(&mesg, path, size);
 369         if (len <= 0)
 370                 return -EINVAL;
 371
 372         len = get_int(&mesg, &maxsize);
 373         if (len)
 374                 return len;
 375
 376         if (maxsize < NFS_FHSIZE)
 377                 return -EINVAL;
 378         maxsize = min(maxsize, NFS3_FHSIZE);
 379
 380         if (qword_get(&mesg, mesg, size)>0)
 381                 return -EINVAL;
 382
 383         /* we have all the words, they are in buf.. */
 384         dom = unix_domain_find(dname);
 385         if (!dom)
 386                 return -ENOMEM;
 387
 388         len = exp_rootfh(net, dom, path, &fh,  maxsize);
 389         auth_domain_put(dom);
 390         if (len)
 391                 return len;
 392
 393         mesg = buf;
 394         len = SIMPLE_TRANSACTION_LIMIT;
 395         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 396         mesg[-1] = '\n';
 397         return mesg - buf;
 398 }
 399
 400 /**
 401  * write_threads - Start NFSD, or report the current number of running threads
 402  *
 403  * Input:
 404  *                      buf:            ignored
 405  *                      size:           zero
 406  * Output:
 407  *      On success:     passed-in buffer filled with '\n'-terminated C
 408  *                      string numeric value representing the number of
 409  *                      running NFSD threads;
 410  *                      return code is the size in bytes of the string
 411  *      On error:       return code is zero
 412  *
 413  * OR
 414  *
 415  * Input:
 416  *                      buf:            C string containing an unsigned
 417  *                                      integer value representing the
 418  *                                      number of NFSD threads to start
 419  *                      size:           non-zero length of C string in @buf
 420  * Output:
 421  *      On success:     NFS service is started;
 422  *                      passed-in buffer filled with '\n'-terminated C
 423  *                      string numeric value representing the number of
 424  *                      running NFSD threads;
 425  *                      return code is the size in bytes of the string
 426  *      On error:       return code is zero or a negative errno value
 427  */
 428 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 429 {
 430         char *mesg = buf;
 431         int rv;
 432         struct net *net = file->f_dentry->d_sb->s_fs_info;
 433
 434         if (size > 0) {
 435                 int newthreads;
 436                 rv = get_int(&mesg, &newthreads);
 437                 if (rv)
 438                         return rv;
 439                 if (newthreads < 0)
 440                         return -EINVAL;
 441                 rv = nfsd_svc(newthreads, net);
 442                 if (rv < 0)
 443                         return rv;
 444         } else
 445                 rv = nfsd_nrthreads(net);
 446
 447         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
 448 }
 449
 450 /**
 451  * write_pool_threads - Set or report the current number of threads per pool
 452  *
 453  * Input:
 454  *                      buf:            ignored
 455  *                      size:           zero
 456  *
 457  * OR
 458  *
 459  * Input:
 460  *                      buf:            C string containing whitespace-
 461  *                                      separated unsigned integer values
 462  *                                      representing the number of NFSD
 463  *                                      threads to start in each pool
 464  *                      size:           non-zero length of C string in @buf
 465  * Output:
 466  *      On success:     passed-in buffer filled with '\n'-terminated C
 467  *                      string containing integer values representing the
 468  *                      number of NFSD threads in each pool;
 469  *                      return code is the size in bytes of the string
 470  *      On error:       return code is zero or a negative errno value
 471  */
 472 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
 473 {
 474         /* if size > 0, look for an array of number of threads per node
 475          * and apply them  then write out number of threads per node as reply
 476          */
 477         char *mesg = buf;
 478         int i;
 479         int rv;
 480         int len;
 481         int npools;
 482         int *nthreads;
 483         struct net *net = file->f_dentry->d_sb->s_fs_info;
 484
 485         mutex_lock(&nfsd_mutex);
 486         npools = nfsd_nrpools(net);
 487         if (npools == 0) {
 488                 /*
 489                  * NFS is shut down.  The admin can start it by
 490                  * writing to the threads file but NOT the pool_threads
 491                  * file, sorry.  Report zero threads.
 492                  */
 493                 mutex_unlock(&nfsd_mutex);
 494                 strcpy(buf, "0\n");
 495                 return strlen(buf);
 496         }
 497
 498         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
 499         rv = -ENOMEM;
 500         if (nthreads == NULL)
 501                 goto out_free;
 502
 503         if (size > 0) {
 504                 for (i = 0; i < npools; i++) {
 505                         rv = get_int(&mesg, &nthreads[i]);
 506                         if (rv == -ENOENT)
 507                                 break;          /* fewer numbers than pools */
 508                         if (rv)
 509                                 goto out_free;  /* syntax error */
 510                         rv = -EINVAL;
 511                         if (nthreads[i] < 0)
 512                                 goto out_free;
 513                 }
 514                 rv = nfsd_set_nrthreads(i, nthreads, net);
 515                 if (rv)
 516                         goto out_free;
 517         }
 518
 519         rv = nfsd_get_nrthreads(npools, nthreads, net);
 520         if (rv)
 521                 goto out_free;
 522
 523         mesg = buf;
 524         size = SIMPLE_TRANSACTION_LIMIT;
 525         for (i = 0; i < npools && size > 0; i++) {
 526                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
 527                 len = strlen(mesg);
 528                 size -= len;
 529                 mesg += len;
 530         }
 531         rv = mesg - buf;
 532 out_free:
 533         kfree(nthreads);
 534         mutex_unlock(&nfsd_mutex);
 535         return rv;
 536 }
 537
 538 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 539 {
 540         char *mesg = buf;
 541         char *vers, *minorp, sign;
 542         int len, num, remaining;
 543         unsigned minor;
 544         ssize_t tlen = 0;
 545         char *sep;
 546         struct net *net = file->f_dentry->d_sb->s_fs_info;
 547         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 548
 549         if (size>0) {
 550                 if (nn->nfsd_serv)
 551                         /* Cannot change versions without updating
 552                          * nn->nfsd_serv->sv_xdrsize, and reallocing
 553                          * rq_argp and rq_resp
 554                          */
 555                         return -EBUSY;
 556                 if (buf[size-1] != '\n')
 557                         return -EINVAL;
 558                 buf[size-1] = 0;
 559
 560                 vers = mesg;
 561                 len = qword_get(&mesg, vers, size);
 562                 if (len <= 0) return -EINVAL;
 563                 do {
 564                         sign = *vers;
 565                         if (sign == '+' || sign == '-')
 566                                 num = simple_strtol((vers+1), &minorp, 0);
 567                         else
 568                                 num = simple_strtol(vers, &minorp, 0);
 569                         if (*minorp == '.') {
 570                                 if (num != 4)
 571                                         return -EINVAL;
 572                                 minor = simple_strtoul(minorp+1, NULL, 0);
 573                                 if (minor == 0)
 574                                         return -EINVAL;
 575                                 if (nfsd_minorversion(minor, sign == '-' ?
 576                                                      NFSD_CLEAR : NFSD_SET) < 0)
 577                                         return -EINVAL;
 578                                 goto next;
 579                         }
 580                         switch(num) {
 581                         case 2:
 582                         case 3:
 583                         case 4:
 584                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 585                                 break;
 586                         default:
 587                                 return -EINVAL;
 588                         }
 589                 next:
 590                         vers += len + 1;
 591                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 592                 /* If all get turned off, turn them back on, as
 593                  * having no versions is BAD
 594                  */
 595                 nfsd_reset_versions();
 596         }
 597
 598         /* Now write current state into reply buffer */
 599         len = 0;
 600         sep = "";
 601         remaining = SIMPLE_TRANSACTION_LIMIT;
 602         for (num=2 ; num <= 4 ; num++)
 603                 if (nfsd_vers(num, NFSD_AVAIL)) {
 604                         len = snprintf(buf, remaining, "%s%c%d", sep,
 605                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 606                                        num);
 607                         sep = " ";
 608
 609                         if (len > remaining)
 610                                 break;
 611                         remaining -= len;
 612                         buf += len;
 613                         tlen += len;
 614                 }
 615         if (nfsd_vers(4, NFSD_AVAIL))
 616                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
 617                      minor++) {
 618                         len = snprintf(buf, remaining, " %c4.%u",
 619                                         (nfsd_vers(4, NFSD_TEST) &&
 620                                          nfsd_minorversion(minor, NFSD_TEST)) ?
 621                                                 '+' : '-',
 622                                         minor);
 623
 624                         if (len > remaining)
 625                                 break;
 626                         remaining -= len;
 627                         buf += len;
 628                         tlen += len;
 629                 }
 630
 631         len = snprintf(buf, remaining, "\n");
 632         if (len > remaining)
 633                 return -EINVAL;
 634         return tlen + len;
 635 }
 636
 637 /**
 638  * write_versions - Set or report the available NFS protocol versions
 639  *
 640  * Input:
 641  *                      buf:            ignored
 642  *                      size:           zero
 643  * Output:
 644  *      On success:     passed-in buffer filled with '\n'-terminated C
 645  *                      string containing positive or negative integer
 646  *                      values representing the current status of each
 647  *                      protocol version;
 648  *                      return code is the size in bytes of the string
 649  *      On error:       return code is zero or a negative errno value
 650  *
 651  * OR
 652  *
 653  * Input:
 654  *                      buf:            C string containing whitespace-
 655  *                                      separated positive or negative
 656  *                                      integer values representing NFS
 657  *                                      protocol versions to enable ("+n")
 658  *                                      or disable ("-n")
 659  *                      size:           non-zero length of C string in @buf
 660  * Output:
 661  *      On success:     status of zero or more protocol versions has
 662  *                      been updated; passed-in buffer filled with
 663  *                      '\n'-terminated C string containing positive
 664  *                      or negative integer values representing the
 665  *                      current status of each protocol version;
 666  *                      return code is the size in bytes of the string
 667  *      On error:       return code is zero or a negative errno value
 668  */
 669 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 670 {
 671         ssize_t rv;
 672
 673         mutex_lock(&nfsd_mutex);
 674         rv = __write_versions(file, buf, size);
 675         mutex_unlock(&nfsd_mutex);
 676         return rv;
 677 }
 678
 679 /*
 680  * Zero-length write.  Return a list of NFSD's current listener
 681  * transports.
 682  */
 683 static ssize_t __write_ports_names(char *buf, struct net *net)
 684 {
 685         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 686
 687         if (nn->nfsd_serv == NULL)
 688                 return 0;
 689         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
 690 }
 691
 692 /*
 693  * A single 'fd' number was written, in which case it must be for
 694  * a socket of a supported family/protocol, and we use it as an
 695  * nfsd listener.
 696  */
 697 static ssize_t __write_ports_addfd(char *buf, struct net *net)
 698 {
 699         char *mesg = buf;
 700         int fd, err;
 701         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 702
 703         err = get_int(&mesg, &fd);
 704         if (err != 0 || fd < 0)
 705                 return -EINVAL;
 706
 707         if (svc_alien_sock(net, fd)) {
 708                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
 709                 return -EINVAL;
 710         }
 711
 712         err = nfsd_create_serv(net);
 713         if (err != 0)
 714                 return err;
 715
 716         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
 717         if (err < 0) {
 718                 nfsd_destroy(net);
 719                 return err;
 720         }
 721
 722         /* Decrease the count, but don't shut down the service */
 723         nn->nfsd_serv->sv_nrthreads--;
 724         return err;
 725 }
 726
 727 /*
 728  * A transport listener is added by writing it's transport name and
 729  * a port number.
 730  */
 731 static ssize_t __write_ports_addxprt(char *buf, struct net *net)
 732 {
 733         char transport[16];
 734         struct svc_xprt *xprt;
 735         int port, err;
 736         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 737
 738         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
 739                 return -EINVAL;
 740
 741         if (port < 1 || port > USHRT_MAX)
 742                 return -EINVAL;
 743
 744         err = nfsd_create_serv(net);
 745         if (err != 0)
 746                 return err;
 747
 748         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 749                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
 750         if (err < 0)
 751                 goto out_err;
 752
 753         err = svc_create_xprt(nn->nfsd_serv, transport, net,
 754                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
 755         if (err < 0 && err != -EAFNOSUPPORT)
 756                 goto out_close;
 757
 758         /* Decrease the count, but don't shut down the service */
 759         nn->nfsd_serv->sv_nrthreads--;
 760         return 0;
 761 out_close:
 762         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
 763         if (xprt != NULL) {
 764                 svc_close_xprt(xprt);
 765                 svc_xprt_put(xprt);
 766         }
 767 out_err:
 768         nfsd_destroy(net);
 769         return err;
 770 }
 771
 772 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
 773                              struct net *net)
 774 {
 775         if (size == 0)
 776                 return __write_ports_names(buf, net);
 777
 778         if (isdigit(buf[0]))
 779                 return __write_ports_addfd(buf, net);
 780
 781         if (isalpha(buf[0]))
 782                 return __write_ports_addxprt(buf, net);
 783
 784         return -EINVAL;
 785 }
 786
 787 /**
 788  * write_ports - Pass a socket file descriptor or transport name to listen on
 789  *
 790  * Input:
 791  *                      buf:            ignored
 792  *                      size:           zero
 793  * Output:
 794  *      On success:     passed-in buffer filled with a '\n'-terminated C
 795  *                      string containing a whitespace-separated list of
 796  *                      named NFSD listeners;
 797  *                      return code is the size in bytes of the string
 798  *      On error:       return code is zero or a negative errno value
 799  *
 800  * OR
 801  *
 802  * Input:
 803  *                      buf:            C string containing an unsigned
 804  *                                      integer value representing a bound
 805  *                                      but unconnected socket that is to be
 806  *                                      used as an NFSD listener; listen(3)
 807  *                                      must be called for a SOCK_STREAM
 808  *                                      socket, otherwise it is ignored
 809  *                      size:           non-zero length of C string in @buf
 810  * Output:
 811  *      On success:     NFS service is started;
 812  *                      passed-in buffer filled with a '\n'-terminated C
 813  *                      string containing a unique alphanumeric name of
 814  *                      the listener;
 815  *                      return code is the size in bytes of the string
 816  *      On error:       return code is a negative errno value
 817  *
 818  * OR
 819  *
 820  * Input:
 821  *                      buf:            C string containing a transport
 822  *                                      name and an unsigned integer value
 823  *                                      representing the port to listen on,
 824  *                                      separated by whitespace
 825  *                      size:           non-zero length of C string in @buf
 826  * Output:
 827  *      On success:     returns zero; NFS service is started
 828  *      On error:       return code is a negative errno value
 829  */
 830 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 831 {
 832         ssize_t rv;
 833         struct net *net = file->f_dentry->d_sb->s_fs_info;
 834
 835         mutex_lock(&nfsd_mutex);
 836         rv = __write_ports(file, buf, size, net);
 837         mutex_unlock(&nfsd_mutex);
 838         return rv;
 839 }
 840
 841
 842 int nfsd_max_blksize;
 843
 844 /**
 845  * write_maxblksize - Set or report the current NFS blksize
 846  *
 847  * Input:
 848  *                      buf:            ignored
 849  *                      size:           zero
 850  *
 851  * OR
 852  *
 853  * Input:
 854  *                      buf:            C string containing an unsigned
 855  *                                      integer value representing the new
 856  *                                      NFS blksize
 857  *                      size:           non-zero length of C string in @buf
 858  * Output:
 859  *      On success:     passed-in buffer filled with '\n'-terminated C string
 860  *                      containing numeric value of the current NFS blksize
 861  *                      setting;
 862  *                      return code is the size in bytes of the string
 863  *      On error:       return code is zero or a negative errno value
 864  */
 865 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 866 {
 867         char *mesg = buf;
 868         struct net *net = file->f_dentry->d_sb->s_fs_info;
 869         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 870
 871         if (size > 0) {
 872                 int bsize;
 873                 int rv = get_int(&mesg, &bsize);
 874                 if (rv)
 875                         return rv;
 876                 /* force bsize into allowed range and
 877                  * required alignment.
 878                  */
 879                 bsize = max_t(int, bsize, 1024);
 880                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
 881                 bsize &= ~(1024-1);
 882                 mutex_lock(&nfsd_mutex);
 883                 if (nn->nfsd_serv) {
 884                         mutex_unlock(&nfsd_mutex);
 885                         return -EBUSY;
 886                 }
 887                 nfsd_max_blksize = bsize;
 888                 mutex_unlock(&nfsd_mutex);
 889         }
 890
 891         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
 892                                                         nfsd_max_blksize);
 893 }
 894
 895 /**
 896  * write_maxconn - Set or report the current max number of connections
 897  *
 898  * Input:
 899  *                      buf:            ignored
 900  *                      size:           zero
 901  * OR
 902  *
 903  * Input:
 904  *                      buf:            C string containing an unsigned
 905  *                                      integer value representing the new
 906  *                                      number of max connections
 907  *                      size:           non-zero length of C string in @buf
 908  * Output:
 909  *      On success:     passed-in buffer filled with '\n'-terminated C string
 910  *                      containing numeric value of max_connections setting
 911  *                      for this net namespace;
 912  *                      return code is the size in bytes of the string
 913  *      On error:       return code is zero or a negative errno value
 914  */
 915 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
 916 {
 917         char *mesg = buf;
 918         struct net *net = file->f_dentry->d_sb->s_fs_info;
 919         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 920         unsigned int maxconn = nn->max_connections;
 921
 922         if (size > 0) {
 923                 int rv = get_uint(&mesg, &maxconn);
 924
 925                 if (rv)
 926                         return rv;
 927                 nn->max_connections = maxconn;
 928         }
 929
 930         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
 931 }
 932
 933 #ifdef CONFIG_NFSD_V4
 934 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
 935                                   time_t *time, struct nfsd_net *nn)
 936 {
 937         char *mesg = buf;
 938         int rv, i;
 939
 940         if (size > 0) {
 941                 if (nn->nfsd_serv)
 942                         return -EBUSY;
 943                 rv = get_int(&mesg, &i);
 944                 if (rv)
 945                         return rv;
 946                 /*
 947                  * Some sanity checking.  We don't have a reason for
 948                  * these particular numbers, but problems with the
 949                  * extremes are:
 950                  *      - Too short: the briefest network outage may
 951                  *        cause clients to lose all their locks.  Also,
 952                  *        the frequent polling may be wasteful.
 953                  *      - Too long: do you really want reboot recovery
 954                  *        to take more than an hour?  Or to make other
 955                  *        clients wait an hour before being able to
 956                  *        revoke a dead client's locks?
 957                  */
 958                 if (i < 10 || i > 3600)
 959                         return -EINVAL;
 960                 *time = i;
 961         }
 962
 963         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
 964 }
 965
 966 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
 967                                 time_t *time, struct nfsd_net *nn)
 968 {
 969         ssize_t rv;
 970
 971         mutex_lock(&nfsd_mutex);
 972         rv = __nfsd4_write_time(file, buf, size, time, nn);
 973         mutex_unlock(&nfsd_mutex);
 974         return rv;
 975 }
 976
 977 /**
 978  * write_leasetime - Set or report the current NFSv4 lease time
 979  *
 980  * Input:
 981  *                      buf:            ignored
 982  *                      size:           zero
 983  *
 984  * OR
 985  *
 986  * Input:
 987  *                      buf:            C string containing an unsigned
 988  *                                      integer value representing the new
 989  *                                      NFSv4 lease expiry time
 990  *                      size:           non-zero length of C string in @buf
 991  * Output:
 992  *      On success:     passed-in buffer filled with '\n'-terminated C
 993  *                      string containing unsigned integer value of the
 994  *                      current lease expiry time;
 995  *                      return code is the size in bytes of the string
 996  *      On error:       return code is zero or a negative errno value
 997  */
 998 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 999 {
1000         struct net *net = file->f_dentry->d_sb->s_fs_info;
1001         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1002         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1003 }
1004
1005 /**
1006  * write_gracetime - Set or report current NFSv4 grace period time
1007  *
1008  * As above, but sets the time of the NFSv4 grace period.
1009  *
1010  * Note this should never be set to less than the *previous*
1011  * lease-period time, but we don't try to enforce this.  (In the common
1012  * case (a new boot), we don't know what the previous lease time was
1013  * anyway.)
1014  */
1015 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1016 {
1017         struct net *net = file->f_dentry->d_sb->s_fs_info;
1018         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1019         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1020 }
1021
1022 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1023                                    struct nfsd_net *nn)
1024 {
1025         char *mesg = buf;
1026         char *recdir;
1027         int len, status;
1028
1029         if (size > 0) {
1030                 if (nn->nfsd_serv)
1031                         return -EBUSY;
1032                 if (size > PATH_MAX || buf[size-1] != '\n')
1033                         return -EINVAL;
1034                 buf[size-1] = 0;
1035
1036                 recdir = mesg;
1037                 len = qword_get(&mesg, recdir, size);
1038                 if (len <= 0)
1039                         return -EINVAL;
1040
1041                 status = nfs4_reset_recoverydir(recdir);
1042                 if (status)
1043                         return status;
1044         }
1045
1046         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1047                                                         nfs4_recoverydir());
1048 }
1049
1050 /**
1051  * write_recoverydir - Set or report the pathname of the recovery directory
1052  *
1053  * Input:
1054  *                      buf:            ignored
1055  *                      size:           zero
1056  *
1057  * OR
1058  *
1059  * Input:
1060  *                      buf:            C string containing the pathname
1061  *                                      of the directory on a local file
1062  *                                      system containing permanent NFSv4
1063  *                                      recovery data
1064  *                      size:           non-zero length of C string in @buf
1065  * Output:
1066  *      On success:     passed-in buffer filled with '\n'-terminated C string
1067  *                      containing the current recovery pathname setting;
1068  *                      return code is the size in bytes of the string
1069  *      On error:       return code is zero or a negative errno value
1070  */
1071 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1072 {
1073         ssize_t rv;
1074         struct net *net = file->f_dentry->d_sb->s_fs_info;
1075         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1076
1077         mutex_lock(&nfsd_mutex);
1078         rv = __write_recoverydir(file, buf, size, nn);
1079         mutex_unlock(&nfsd_mutex);
1080         return rv;
1081 }
1082
1083 /**
1084  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1085  *
1086  * Input:
1087  *                      buf:            ignored
1088  *                      size:           zero
1089  * OR
1090  *
1091  * Input:
1092  *                      buf:            any value
1093  *                      size:           non-zero length of C string in @buf
1094  * Output:
1095  *                      passed-in buffer filled with "Y" or "N" with a newline
1096  *                      and NULL-terminated C string. This indicates whether
1097  *                      the grace period has ended in the current net
1098  *                      namespace. Return code is the size in bytes of the
1099  *                      string. Writing a string that starts with 'Y', 'y', or
1100  *                      '1' to the file will end the grace period for nfsd's v4
1101  *                      lock manager.
1102  */
1103 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1104 {
1105         struct net *net = file->f_dentry->d_sb->s_fs_info;
1106         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1107
1108         if (size > 0) {
1109                 switch(buf[0]) {
1110                 case 'Y':
1111                 case 'y':
1112                 case '1':
1113                         nfsd4_end_grace(nn);
1114                         break;
1115                 default:
1116                         return -EINVAL;
1117                 }
1118         }
1119
1120         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1121                          nn->grace_ended ? 'Y' : 'N');
1122 }
1123
1124 #endif
1125
1126 /*----------------------------------------------------------------------------*/
1127 /*
1128  *      populating the filesystem.
1129  */
1130
1131 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1132 {
1133         static struct tree_descr nfsd_files[] = {
1134                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1135                 [NFSD_Export_features] = {"export_features",
1136                                         &export_features_operations, S_IRUGO},
1137                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1138                                         &transaction_ops, S_IWUSR|S_IRUSR},
1139                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1140                                         &transaction_ops, S_IWUSR|S_IRUSR},
1141                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1142                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1143                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1144                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1145                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1146                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1147                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1148                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1149                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1150 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1151                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1152 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1153 #ifdef CONFIG_NFSD_V4
1154                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1155                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1156                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1157                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1158 #endif
1159                 /* last one */ {""}
1160         };
1161         struct net *net = data;
1162         int ret;
1163
1164         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1165         if (ret)
1166                 return ret;
1167         sb->s_fs_info = get_net(net);
1168         return 0;
1169 }
1170
1171 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1172         int flags, const char *dev_name, void *data)
1173 {
1174         return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1175 }
1176
1177 static void nfsd_umount(struct super_block *sb)
1178 {
1179         struct net *net = sb->s_fs_info;
1180
1181         kill_litter_super(sb);
1182         put_net(net);
1183 }
1184
1185 static struct file_system_type nfsd_fs_type = {
1186         .owner          = THIS_MODULE,
1187         .name           = "nfsd",
1188         .mount          = nfsd_mount,
1189         .kill_sb        = nfsd_umount,
1190 };
1191 MODULE_ALIAS_FS("nfsd");
1192
1193 #ifdef CONFIG_PROC_FS
1194 static int create_proc_exports_entry(void)
1195 {
1196         struct proc_dir_entry *entry;
1197
1198         entry = proc_mkdir("fs/nfs", NULL);
1199         if (!entry)
1200                 return -ENOMEM;
1201         entry = proc_create("exports", 0, entry,
1202                                  &exports_proc_operations);
1203         if (!entry) {
1204                 remove_proc_entry("fs/nfs", NULL);
1205                 return -ENOMEM;
1206         }
1207         return 0;
1208 }
1209 #else /* CONFIG_PROC_FS */
1210 static int create_proc_exports_entry(void)
1211 {
1212         return 0;
1213 }
1214 #endif
1215
1216 int nfsd_net_id;
1217
1218 static __net_init int nfsd_init_net(struct net *net)
1219 {
1220         int retval;
1221         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1222
1223         retval = nfsd_export_init(net);
1224         if (retval)
1225                 goto out_export_error;
1226         retval = nfsd_idmap_init(net);
1227         if (retval)
1228                 goto out_idmap_error;
1229         nn->nfsd4_lease = 90;   /* default lease time */
1230         nn->nfsd4_grace = 90;
1231         return 0;
1232
1233 out_idmap_error:
1234         nfsd_export_shutdown(net);
1235 out_export_error:
1236         return retval;
1237 }
1238
1239 static __net_exit void nfsd_exit_net(struct net *net)
1240 {
1241         nfsd_idmap_shutdown(net);
1242         nfsd_export_shutdown(net);
1243 }
1244
1245 static struct pernet_operations nfsd_net_ops = {
1246         .init = nfsd_init_net,
1247         .exit = nfsd_exit_net,
1248         .id   = &nfsd_net_id,
1249         .size = sizeof(struct nfsd_net),
1250 };
1251
1252 static int __init init_nfsd(void)
1253 {
1254         int retval;
1255         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1256
1257         retval = register_cld_notifier();
1258         if (retval)
1259                 return retval;
1260         retval = register_pernet_subsys(&nfsd_net_ops);
1261         if (retval < 0)
1262                 goto out_unregister_notifier;
1263         retval = nfsd4_init_slabs();
1264         if (retval)
1265                 goto out_unregister_pernet;
1266         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1267         if (retval)
1268                 goto out_free_slabs;
1269         nfsd_stat_init();       /* Statistics */
1270         retval = nfsd_reply_cache_init();
1271         if (retval)
1272                 goto out_free_stat;
1273         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1274         retval = create_proc_exports_entry();
1275         if (retval)
1276                 goto out_free_lockd;
1277         retval = register_filesystem(&nfsd_fs_type);
1278         if (retval)
1279                 goto out_free_all;
1280         return 0;
1281 out_free_all:
1282         remove_proc_entry("fs/nfs/exports", NULL);
1283         remove_proc_entry("fs/nfs", NULL);
1284 out_free_lockd:
1285         nfsd_lockd_shutdown();
1286         nfsd_reply_cache_shutdown();
1287 out_free_stat:
1288         nfsd_stat_shutdown();
1289         nfsd_fault_inject_cleanup();
1290 out_free_slabs:
1291         nfsd4_free_slabs();
1292 out_unregister_pernet:
1293         unregister_pernet_subsys(&nfsd_net_ops);
1294 out_unregister_notifier:
1295         unregister_cld_notifier();
1296         return retval;
1297 }
1298
1299 static void __exit exit_nfsd(void)
1300 {
1301         nfsd_reply_cache_shutdown();
1302         remove_proc_entry("fs/nfs/exports", NULL);
1303         remove_proc_entry("fs/nfs", NULL);
1304         nfsd_stat_shutdown();
1305         nfsd_lockd_shutdown();
1306         nfsd4_free_slabs();
1307         nfsd_fault_inject_cleanup();
1308         unregister_filesystem(&nfsd_fs_type);
1309         unregister_pernet_subsys(&nfsd_net_ops);
1310         unregister_cld_notifier();
1311 }
1312
1313 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1314 MODULE_LICENSE("GPL");
1315 module_init(init_nfsd)
1316 module_exit(exit_nfsd)