fs/nfsd/nfsctl.c

   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/module.h>
  11
  12 #include <linux/linkage.h>
  13 #include <linux/time.h>
  14 #include <linux/errno.h>
  15 #include <linux/fs.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/net.h>
  18 #include <linux/in.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/unistd.h>
  21 #include <linux/slab.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/init.h>
  26 #include <linux/string.h>
  27
  28 #include <linux/nfs.h>
  29 #include <linux/nfsd_idmap.h>
  30 #include <linux/sunrpc/svc.h>
  31 #include <linux/nfsd/nfsd.h>
  32 #include <linux/nfsd/cache.h>
  33 #include <linux/nfsd/xdr.h>
  34 #include <linux/nfsd/xdr3.h>
  35 #include <linux/nfsd/syscall.h>
  36 #include <linux/nfsd/interface.h>
  37
  38 #include <asm/uaccess.h>
  39
  40 unsigned int nfsd_versbits = ~0;
  41
  42 /*
  43  *      We have a single directory with 9 nodes in it.
  44  */
  45 enum {
  46         NFSD_Root = 1,
  47         NFSD_Svc,
  48         NFSD_Add,
  49         NFSD_Del,
  50         NFSD_Export,
  51         NFSD_Unexport,
  52         NFSD_Getfd,
  53         NFSD_Getfs,
  54         NFSD_List,
  55         NFSD_Fh,
  56         NFSD_Threads,
  57         NFSD_Versions,
  58         /*
  59          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  60          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  61          */
  62 #ifdef CONFIG_NFSD_V4
  63         NFSD_Leasetime,
  64         NFSD_RecoveryDir,
  65 #endif
  66 };
  67
  68 /*
  69  * write() for these nodes.
  70  */
  71 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  72 static ssize_t write_add(struct file *file, char *buf, size_t size);
  73 static ssize_t write_del(struct file *file, char *buf, size_t size);
  74 static ssize_t write_export(struct file *file, char *buf, size_t size);
  75 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  76 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  77 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  78 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  79 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  80 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  81 #ifdef CONFIG_NFSD_V4
  82 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  83 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  84 #endif
  85
  86 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  87         [NFSD_Svc] = write_svc,
  88         [NFSD_Add] = write_add,
  89         [NFSD_Del] = write_del,
  90         [NFSD_Export] = write_export,
  91         [NFSD_Unexport] = write_unexport,
  92         [NFSD_Getfd] = write_getfd,
  93         [NFSD_Getfs] = write_getfs,
  94         [NFSD_Fh] = write_filehandle,
  95         [NFSD_Threads] = write_threads,
  96         [NFSD_Versions] = write_versions,
  97 #ifdef CONFIG_NFSD_V4
  98         [NFSD_Leasetime] = write_leasetime,
  99         [NFSD_RecoveryDir] = write_recoverydir,
 100 #endif
 101 };
 102
 103 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 104 {
 105         ino_t ino =  file->f_dentry->d_inode->i_ino;
 106         char *data;
 107         ssize_t rv;
 108
 109         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 110                 return -EINVAL;
 111
 112         data = simple_transaction_get(file, buf, size);
 113         if (IS_ERR(data))
 114                 return PTR_ERR(data);
 115
 116         rv =  write_op[ino](file, data, size);
 117         if (rv>0) {
 118                 simple_transaction_set(file, rv);
 119                 rv = size;
 120         }
 121         return rv;
 122 }
 123
 124 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 125 {
 126         if (! file->private_data) {
 127                 /* An attempt to read a transaction file without writing
 128                  * causes a 0-byte write so that the file can return
 129                  * state information
 130                  */
 131                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 132                 if (rv < 0)
 133                         return rv;
 134         }
 135         return simple_transaction_read(file, buf, size, pos);
 136 }
 137
 138 static const struct file_operations transaction_ops = {
 139         .write          = nfsctl_transaction_write,
 140         .read           = nfsctl_transaction_read,
 141         .release        = simple_transaction_release,
 142 };
 143
 144 extern struct seq_operations nfs_exports_op;
 145 static int exports_open(struct inode *inode, struct file *file)
 146 {
 147         return seq_open(file, &nfs_exports_op);
 148 }
 149
 150 static const struct file_operations exports_operations = {
 151         .open           = exports_open,
 152         .read           = seq_read,
 153         .llseek         = seq_lseek,
 154         .release        = seq_release,
 155 };
 156
 157 /*----------------------------------------------------------------------------*/
 158 /*
 159  * payload - write methods
 160  * If the method has a response, the response should be put in buf,
 161  * and the length returned.  Otherwise return 0 or and -error.
 162  */
 163
 164 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 165 {
 166         struct nfsctl_svc *data;
 167         if (size < sizeof(*data))
 168                 return -EINVAL;
 169         data = (struct nfsctl_svc*) buf;
 170         return nfsd_svc(data->svc_port, data->svc_nthreads);
 171 }
 172
 173 static ssize_t write_add(struct file *file, char *buf, size_t size)
 174 {
 175         struct nfsctl_client *data;
 176         if (size < sizeof(*data))
 177                 return -EINVAL;
 178         data = (struct nfsctl_client *)buf;
 179         return exp_addclient(data);
 180 }
 181
 182 static ssize_t write_del(struct file *file, char *buf, size_t size)
 183 {
 184         struct nfsctl_client *data;
 185         if (size < sizeof(*data))
 186                 return -EINVAL;
 187         data = (struct nfsctl_client *)buf;
 188         return exp_delclient(data);
 189 }
 190
 191 static ssize_t write_export(struct file *file, char *buf, size_t size)
 192 {
 193         struct nfsctl_export *data;
 194         if (size < sizeof(*data))
 195                 return -EINVAL;
 196         data = (struct nfsctl_export*)buf;
 197         return exp_export(data);
 198 }
 199
 200 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 201 {
 202         struct nfsctl_export *data;
 203
 204         if (size < sizeof(*data))
 205                 return -EINVAL;
 206         data = (struct nfsctl_export*)buf;
 207         return exp_unexport(data);
 208 }
 209
 210 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 211 {
 212         struct nfsctl_fsparm *data;
 213         struct sockaddr_in *sin;
 214         struct auth_domain *clp;
 215         int err = 0;
 216         struct knfsd_fh *res;
 217
 218         if (size < sizeof(*data))
 219                 return -EINVAL;
 220         data = (struct nfsctl_fsparm*)buf;
 221         err = -EPROTONOSUPPORT;
 222         if (data->gd_addr.sa_family != AF_INET)
 223                 goto out;
 224         sin = (struct sockaddr_in *)&data->gd_addr;
 225         if (data->gd_maxlen > NFS3_FHSIZE)
 226                 data->gd_maxlen = NFS3_FHSIZE;
 227
 228         res = (struct knfsd_fh*)buf;
 229
 230         exp_readlock();
 231         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 232                 err = -EPERM;
 233         else {
 234                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 235                 auth_domain_put(clp);
 236         }
 237         exp_readunlock();
 238         if (err == 0)
 239                 err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
 240  out:
 241         return err;
 242 }
 243
 244 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 245 {
 246         struct nfsctl_fdparm *data;
 247         struct sockaddr_in *sin;
 248         struct auth_domain *clp;
 249         int err = 0;
 250         struct knfsd_fh fh;
 251         char *res;
 252
 253         if (size < sizeof(*data))
 254                 return -EINVAL;
 255         data = (struct nfsctl_fdparm*)buf;
 256         err = -EPROTONOSUPPORT;
 257         if (data->gd_addr.sa_family != AF_INET)
 258                 goto out;
 259         err = -EINVAL;
 260         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 261                 goto out;
 262
 263         res = buf;
 264         sin = (struct sockaddr_in *)&data->gd_addr;
 265         exp_readlock();
 266         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 267                 err = -EPERM;
 268         else {
 269                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 270                 auth_domain_put(clp);
 271         }
 272         exp_readunlock();
 273
 274         if (err == 0) {
 275                 memset(res,0, NFS_FHSIZE);
 276                 memcpy(res, &fh.fh_base, fh.fh_size);
 277                 err = NFS_FHSIZE;
 278         }
 279  out:
 280         return err;
 281 }
 282
 283 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 284 {
 285         /* request is:
 286          *   domain path maxsize
 287          * response is
 288          *   filehandle
 289          *
 290          * qword quoting is used, so filehandle will be \x....
 291          */
 292         char *dname, *path;
 293         int maxsize;
 294         char *mesg = buf;
 295         int len;
 296         struct auth_domain *dom;
 297         struct knfsd_fh fh;
 298
 299         if (buf[size-1] != '\n')
 300                 return -EINVAL;
 301         buf[size-1] = 0;
 302
 303         dname = mesg;
 304         len = qword_get(&mesg, dname, size);
 305         if (len <= 0) return -EINVAL;
 306
 307         path = dname+len+1;
 308         len = qword_get(&mesg, path, size);
 309         if (len <= 0) return -EINVAL;
 310
 311         len = get_int(&mesg, &maxsize);
 312         if (len)
 313                 return len;
 314
 315         if (maxsize < NFS_FHSIZE)
 316                 return -EINVAL;
 317         if (maxsize > NFS3_FHSIZE)
 318                 maxsize = NFS3_FHSIZE;
 319
 320         if (qword_get(&mesg, mesg, size)>0)
 321                 return -EINVAL;
 322
 323         /* we have all the words, they are in buf.. */
 324         dom = unix_domain_find(dname);
 325         if (!dom)
 326                 return -ENOMEM;
 327
 328         len = exp_rootfh(dom, path, &fh,  maxsize);
 329         auth_domain_put(dom);
 330         if (len)
 331                 return len;
 332
 333         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 334         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 335         mesg[-1] = '\n';
 336         return mesg - buf;
 337 }
 338
 339 extern int nfsd_nrthreads(void);
 340
 341 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 342 {
 343         /* if size > 0, look for a number of threads and call nfsd_svc
 344          * then write out number of threads as reply
 345          */
 346         char *mesg = buf;
 347         int rv;
 348         if (size > 0) {
 349                 int newthreads;
 350                 rv = get_int(&mesg, &newthreads);
 351                 if (rv)
 352                         return rv;
 353                 if (newthreads <0)
 354                         return -EINVAL;
 355                 rv = nfsd_svc(2049, newthreads);
 356                 if (rv)
 357                         return rv;
 358         }
 359         sprintf(buf, "%d\n", nfsd_nrthreads());
 360         return strlen(buf);
 361 }
 362
 363 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 364 {
 365         /*
 366          * Format:
 367          *   [-/+]vers [-/+]vers ...
 368          */
 369         char *mesg = buf;
 370         char *vers, sign;
 371         int len, num;
 372         ssize_t tlen = 0;
 373         char *sep;
 374
 375         if (size>0) {
 376                 if (nfsd_serv)
 377                         return -EBUSY;
 378                 if (buf[size-1] != '\n')
 379                         return -EINVAL;
 380                 buf[size-1] = 0;
 381
 382                 vers = mesg;
 383                 len = qword_get(&mesg, vers, size);
 384                 if (len <= 0) return -EINVAL;
 385                 do {
 386                         sign = *vers;
 387                         if (sign == '+' || sign == '-')
 388                                 num = simple_strtol((vers+1), NULL, 0);
 389                         else
 390                                 num = simple_strtol(vers, NULL, 0);
 391                         switch(num) {
 392                         case 2:
 393                         case 3:
 394                         case 4:
 395                                 if (sign != '-')
 396                                         NFSCTL_VERSET(nfsd_versbits, num);
 397                                 else
 398                                         NFSCTL_VERUNSET(nfsd_versbits, num);
 399                                 break;
 400                         default:
 401                                 return -EINVAL;
 402                         }
 403                         vers += len + 1;
 404                         tlen += len;
 405                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 406                 /* If all get turned off, turn them back on, as
 407                  * having no versions is BAD
 408                  */
 409                 if ((nfsd_versbits & NFSCTL_VERALL)==0)
 410                         nfsd_versbits = NFSCTL_VERALL;
 411         }
 412         /* Now write current state into reply buffer */
 413         len = 0;
 414         sep = "";
 415         for (num=2 ; num <= 4 ; num++)
 416                 if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
 417                         len += sprintf(buf+len, "%s%c%d", sep,
 418                                        NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
 419                                        num);
 420                         sep = " ";
 421                 }
 422         len += sprintf(buf+len, "\n");
 423         return len;
 424 }
 425
 426 #ifdef CONFIG_NFSD_V4
 427 extern time_t nfs4_leasetime(void);
 428
 429 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 430 {
 431         /* if size > 10 seconds, call
 432          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 433          */
 434         char *mesg = buf;
 435         int rv;
 436
 437         if (size > 0) {
 438                 int lease;
 439                 rv = get_int(&mesg, &lease);
 440                 if (rv)
 441                         return rv;
 442                 if (lease < 10 || lease > 3600)
 443                         return -EINVAL;
 444                 nfs4_reset_lease(lease);
 445         }
 446         sprintf(buf, "%ld\n", nfs4_lease_time());
 447         return strlen(buf);
 448 }
 449
 450 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 451 {
 452         char *mesg = buf;
 453         char *recdir;
 454         int len, status;
 455
 456         if (size > PATH_MAX || buf[size-1] != '\n')
 457                 return -EINVAL;
 458         buf[size-1] = 0;
 459
 460         recdir = mesg;
 461         len = qword_get(&mesg, recdir, size);
 462         if (len <= 0)
 463                 return -EINVAL;
 464
 465         status = nfs4_reset_recoverydir(recdir);
 466         return strlen(buf);
 467 }
 468 #endif
 469
 470 /*----------------------------------------------------------------------------*/
 471 /*
 472  *      populating the filesystem.
 473  */
 474
 475 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 476 {
 477         static struct tree_descr nfsd_files[] = {
 478                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 479                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 480                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 481                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 482                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 483                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 484                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 485                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 486                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 487                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 488                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 489 #ifdef CONFIG_NFSD_V4
 490                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 491                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 492 #endif
 493                 /* last one */ {""}
 494         };
 495         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 496 }
 497
 498 static struct super_block *nfsd_get_sb(struct file_system_type *fs_type,
 499         int flags, const char *dev_name, void *data)
 500 {
 501         return get_sb_single(fs_type, flags, data, nfsd_fill_super);
 502 }
 503
 504 static struct file_system_type nfsd_fs_type = {
 505         .owner          = THIS_MODULE,
 506         .name           = "nfsd",
 507         .get_sb         = nfsd_get_sb,
 508         .kill_sb        = kill_litter_super,
 509 };
 510
 511  /*
 512  * NFS sysctls
 513  */
 514 static struct ctl_table_header *nfsd_sysctl_table;
 515
 516 static ctl_table nfsd_sysctls[] = {
 517         {
 518                 .ctl_name       = -2,
 519                 .procname       = "nfsd_readdirplus_max",
 520                 .data           = &nfsd_readdirplus_max,
 521                 .maxlen         = sizeof(nfsd_readdirplus_max),
 522                 .mode           = 0644,
 523                 .proc_handler   = &proc_dointvec_minmax,
 524                 .extra1         = &nfsd_readdirplus_max_lb,
 525                 .extra2         = &nfsd_readdirplus_max_ub,
 526         },
 527         { .ctl_name = 0 }
 528 };
 529
 530 static int __init init_nfsd(void)
 531 {
 532         struct ctl_path ctl_path[] = { { CTL_FS, "fs", 0555 }, { -2, "nfs", 0555 }, { 0 } };
 533         int retval;
 534         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 535
 536         nfsd_stat_init();       /* Statistics */
 537         nfsd_cache_init();      /* RPC reply cache */
 538         nfsd_export_init();     /* Exports table */
 539         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 540         nfs4_state_init();      /* NFSv4 locking state */
 541         nfsd_idmap_init();      /* Name to ID mapping */
 542         nfsd_sysctl_table = register_sysctl_table_path(nfsd_sysctls, ctl_path);
 543         if (proc_mkdir("fs/nfs", NULL)) {
 544                 struct proc_dir_entry *entry;
 545                 entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 546                 if (entry)
 547                         entry->proc_fops =  &exports_operations;
 548         }
 549         retval = register_filesystem(&nfsd_fs_type);
 550         if (retval) {
 551                 nfsd_export_shutdown();
 552                 nfsd_cache_shutdown();
 553                 remove_proc_entry("fs/nfs/exports", NULL);
 554                 remove_proc_entry("fs/nfs", NULL);
 555                 nfsd_stat_shutdown();
 556                 nfsd_lockd_shutdown();
 557                 if (nfsd_sysctl_table)
 558                         unregister_sysctl_table(nfsd_sysctl_table);
 559                 nfsd_sysctl_table = NULL;
 560         }
 561         return retval;
 562 }
 563
 564 static void __exit exit_nfsd(void)
 565 {
 566         nfsd_export_shutdown();
 567         nfsd_cache_shutdown();
 568         remove_proc_entry("fs/nfs/exports", NULL);
 569         remove_proc_entry("fs/nfs", NULL);
 570         nfsd_stat_shutdown();
 571         nfsd_lockd_shutdown();
 572         nfsd_idmap_shutdown();
 573         unregister_filesystem(&nfsd_fs_type);
 574         if (nfsd_sysctl_table)
 575                 unregister_sysctl_table(nfsd_sysctl_table);
 576         nfsd_sysctl_table = NULL;
 577 }
 578
 579 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 580 MODULE_LICENSE("GPL");
 581 module_init(init_nfsd)
 582 module_exit(exit_nfsd)