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/module.h>
  10
  11 #include <linux/linkage.h>
  12 #include <linux/time.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/fcntl.h>
  16 #include <linux/net.h>
  17 #include <linux/in.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/unistd.h>
  20 #include <linux/slab.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/pagemap.h>
  24 #include <linux/init.h>
  25 #include <linux/string.h>
  26 #include <linux/smp_lock.h>
  27 #include <linux/ctype.h>
  28
  29 #include <linux/nfs.h>
  30 #include <linux/nfsd_idmap.h>
  31 #include <linux/lockd/bind.h>
  32 #include <linux/sunrpc/svc.h>
  33 #include <linux/sunrpc/svcsock.h>
  34 #include <linux/nfsd/nfsd.h>
  35 #include <linux/nfsd/cache.h>
  36 #include <linux/nfsd/xdr.h>
  37 #include <linux/nfsd/syscall.h>
  38 #include <linux/nfsd/interface.h>
  39
  40 #include <asm/uaccess.h>
  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         NFSD_Ports,
  59         /*
  60          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  61          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  62          */
  63 #ifdef CONFIG_NFSD_V4
  64         NFSD_Leasetime,
  65         NFSD_RecoveryDir,
  66 #endif
  67 };
  68
  69 /*
  70  * write() for these nodes.
  71  */
  72 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  73 static ssize_t write_add(struct file *file, char *buf, size_t size);
  74 static ssize_t write_del(struct file *file, char *buf, size_t size);
  75 static ssize_t write_export(struct file *file, char *buf, size_t size);
  76 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  77 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  78 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  79 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  80 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  81 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  82 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  83 #ifdef CONFIG_NFSD_V4
  84 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  85 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  86 #endif
  87
  88 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  89         [NFSD_Svc] = write_svc,
  90         [NFSD_Add] = write_add,
  91         [NFSD_Del] = write_del,
  92         [NFSD_Export] = write_export,
  93         [NFSD_Unexport] = write_unexport,
  94         [NFSD_Getfd] = write_getfd,
  95         [NFSD_Getfs] = write_getfs,
  96         [NFSD_Fh] = write_filehandle,
  97         [NFSD_Threads] = write_threads,
  98         [NFSD_Versions] = write_versions,
  99         [NFSD_Ports] = write_ports,
 100 #ifdef CONFIG_NFSD_V4
 101         [NFSD_Leasetime] = write_leasetime,
 102         [NFSD_RecoveryDir] = write_recoverydir,
 103 #endif
 104 };
 105
 106 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 107 {
 108         ino_t ino =  file->f_dentry->d_inode->i_ino;
 109         char *data;
 110         ssize_t rv;
 111
 112         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 113                 return -EINVAL;
 114
 115         data = simple_transaction_get(file, buf, size);
 116         if (IS_ERR(data))
 117                 return PTR_ERR(data);
 118
 119         rv =  write_op[ino](file, data, size);
 120         if (rv>0) {
 121                 simple_transaction_set(file, rv);
 122                 rv = size;
 123         }
 124         return rv;
 125 }
 126
 127 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 128 {
 129         if (! file->private_data) {
 130                 /* An attempt to read a transaction file without writing
 131                  * causes a 0-byte write so that the file can return
 132                  * state information
 133                  */
 134                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 135                 if (rv < 0)
 136                         return rv;
 137         }
 138         return simple_transaction_read(file, buf, size, pos);
 139 }
 140
 141 static const struct file_operations transaction_ops = {
 142         .write          = nfsctl_transaction_write,
 143         .read           = nfsctl_transaction_read,
 144         .release        = simple_transaction_release,
 145 };
 146
 147 extern struct seq_operations nfs_exports_op;
 148 static int exports_open(struct inode *inode, struct file *file)
 149 {
 150         return seq_open(file, &nfs_exports_op);
 151 }
 152
 153 static const struct file_operations exports_operations = {
 154         .open           = exports_open,
 155         .read           = seq_read,
 156         .llseek         = seq_lseek,
 157         .release        = seq_release,
 158 };
 159
 160 /*----------------------------------------------------------------------------*/
 161 /*
 162  * payload - write methods
 163  * If the method has a response, the response should be put in buf,
 164  * and the length returned.  Otherwise return 0 or and -error.
 165  */
 166
 167 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 168 {
 169         struct nfsctl_svc *data;
 170         if (size < sizeof(*data))
 171                 return -EINVAL;
 172         data = (struct nfsctl_svc*) buf;
 173         return nfsd_svc(data->svc_port, data->svc_nthreads);
 174 }
 175
 176 static ssize_t write_add(struct file *file, char *buf, size_t size)
 177 {
 178         struct nfsctl_client *data;
 179         if (size < sizeof(*data))
 180                 return -EINVAL;
 181         data = (struct nfsctl_client *)buf;
 182         return exp_addclient(data);
 183 }
 184
 185 static ssize_t write_del(struct file *file, char *buf, size_t size)
 186 {
 187         struct nfsctl_client *data;
 188         if (size < sizeof(*data))
 189                 return -EINVAL;
 190         data = (struct nfsctl_client *)buf;
 191         return exp_delclient(data);
 192 }
 193
 194 static ssize_t write_export(struct file *file, char *buf, size_t size)
 195 {
 196         struct nfsctl_export *data;
 197         if (size < sizeof(*data))
 198                 return -EINVAL;
 199         data = (struct nfsctl_export*)buf;
 200         return exp_export(data);
 201 }
 202
 203 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 204 {
 205         struct nfsctl_export *data;
 206
 207         if (size < sizeof(*data))
 208                 return -EINVAL;
 209         data = (struct nfsctl_export*)buf;
 210         return exp_unexport(data);
 211 }
 212
 213 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 214 {
 215         struct nfsctl_fsparm *data;
 216         struct sockaddr_in *sin;
 217         struct auth_domain *clp;
 218         int err = 0;
 219         struct knfsd_fh *res;
 220
 221         if (size < sizeof(*data))
 222                 return -EINVAL;
 223         data = (struct nfsctl_fsparm*)buf;
 224         err = -EPROTONOSUPPORT;
 225         if (data->gd_addr.sa_family != AF_INET)
 226                 goto out;
 227         sin = (struct sockaddr_in *)&data->gd_addr;
 228         if (data->gd_maxlen > NFS3_FHSIZE)
 229                 data->gd_maxlen = NFS3_FHSIZE;
 230
 231         res = (struct knfsd_fh*)buf;
 232
 233         exp_readlock();
 234         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 235                 err = -EPERM;
 236         else {
 237                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 238                 auth_domain_put(clp);
 239         }
 240         exp_readunlock();
 241         if (err == 0)
 242                 err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
 243  out:
 244         return err;
 245 }
 246
 247 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 248 {
 249         struct nfsctl_fdparm *data;
 250         struct sockaddr_in *sin;
 251         struct auth_domain *clp;
 252         int err = 0;
 253         struct knfsd_fh fh;
 254         char *res;
 255
 256         if (size < sizeof(*data))
 257                 return -EINVAL;
 258         data = (struct nfsctl_fdparm*)buf;
 259         err = -EPROTONOSUPPORT;
 260         if (data->gd_addr.sa_family != AF_INET)
 261                 goto out;
 262         err = -EINVAL;
 263         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 264                 goto out;
 265
 266         res = buf;
 267         sin = (struct sockaddr_in *)&data->gd_addr;
 268         exp_readlock();
 269         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 270                 err = -EPERM;
 271         else {
 272                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 273                 auth_domain_put(clp);
 274         }
 275         exp_readunlock();
 276
 277         if (err == 0) {
 278                 memset(res,0, NFS_FHSIZE);
 279                 memcpy(res, &fh.fh_base, fh.fh_size);
 280                 err = NFS_FHSIZE;
 281         }
 282  out:
 283         return err;
 284 }
 285
 286 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 287 {
 288         /* request is:
 289          *   domain path maxsize
 290          * response is
 291          *   filehandle
 292          *
 293          * qword quoting is used, so filehandle will be \x....
 294          */
 295         char *dname, *path;
 296         int maxsize;
 297         char *mesg = buf;
 298         int len;
 299         struct auth_domain *dom;
 300         struct knfsd_fh fh;
 301
 302         if (buf[size-1] != '\n')
 303                 return -EINVAL;
 304         buf[size-1] = 0;
 305
 306         dname = mesg;
 307         len = qword_get(&mesg, dname, size);
 308         if (len <= 0) return -EINVAL;
 309
 310         path = dname+len+1;
 311         len = qword_get(&mesg, path, size);
 312         if (len <= 0) return -EINVAL;
 313
 314         len = get_int(&mesg, &maxsize);
 315         if (len)
 316                 return len;
 317
 318         if (maxsize < NFS_FHSIZE)
 319                 return -EINVAL;
 320         if (maxsize > NFS3_FHSIZE)
 321                 maxsize = NFS3_FHSIZE;
 322
 323         if (qword_get(&mesg, mesg, size)>0)
 324                 return -EINVAL;
 325
 326         /* we have all the words, they are in buf.. */
 327         dom = unix_domain_find(dname);
 328         if (!dom)
 329                 return -ENOMEM;
 330
 331         len = exp_rootfh(dom, path, &fh,  maxsize);
 332         auth_domain_put(dom);
 333         if (len)
 334                 return len;
 335
 336         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 337         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 338         mesg[-1] = '\n';
 339         return mesg - buf;
 340 }
 341
 342 extern int nfsd_nrthreads(void);
 343
 344 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 345 {
 346         /* if size > 0, look for a number of threads and call nfsd_svc
 347          * then write out number of threads as reply
 348          */
 349         char *mesg = buf;
 350         int rv;
 351         if (size > 0) {
 352                 int newthreads;
 353                 rv = get_int(&mesg, &newthreads);
 354                 if (rv)
 355                         return rv;
 356                 if (newthreads <0)
 357                         return -EINVAL;
 358                 rv = nfsd_svc(2049, newthreads);
 359                 if (rv)
 360                         return rv;
 361         }
 362         sprintf(buf, "%d\n", nfsd_nrthreads());
 363         return strlen(buf);
 364 }
 365
 366 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 367 {
 368         /*
 369          * Format:
 370          *   [-/+]vers [-/+]vers ...
 371          */
 372         char *mesg = buf;
 373         char *vers, sign;
 374         int len, num;
 375         ssize_t tlen = 0;
 376         char *sep;
 377
 378         if (size>0) {
 379                 if (nfsd_serv)
 380                         /* Cannot change versions without updating
 381                          * nfsd_serv->sv_xdrsize, and reallocing
 382                          * rq_argp and rq_resp
 383                          */
 384                         return -EBUSY;
 385                 if (buf[size-1] != '\n')
 386                         return -EINVAL;
 387                 buf[size-1] = 0;
 388
 389                 vers = mesg;
 390                 len = qword_get(&mesg, vers, size);
 391                 if (len <= 0) return -EINVAL;
 392                 do {
 393                         sign = *vers;
 394                         if (sign == '+' || sign == '-')
 395                                 num = simple_strtol((vers+1), NULL, 0);
 396                         else
 397                                 num = simple_strtol(vers, NULL, 0);
 398                         switch(num) {
 399                         case 2:
 400                         case 3:
 401                         case 4:
 402                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
 403                                 break;
 404                         default:
 405                                 return -EINVAL;
 406                         }
 407                         vers += len + 1;
 408                         tlen += len;
 409                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 410                 /* If all get turned off, turn them back on, as
 411                  * having no versions is BAD
 412                  */
 413                 nfsd_reset_versions();
 414         }
 415         /* Now write current state into reply buffer */
 416         len = 0;
 417         sep = "";
 418         for (num=2 ; num <= 4 ; num++)
 419                 if (nfsd_vers(num, NFSD_AVAIL)) {
 420                         len += sprintf(buf+len, "%s%c%d", sep,
 421                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
 422                                        num);
 423                         sep = " ";
 424                 }
 425         len += sprintf(buf+len, "\n");
 426         return len;
 427 }
 428
 429 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 430 {
 431         if (size == 0) {
 432                 int len = 0;
 433                 lock_kernel();
 434                 if (nfsd_serv)
 435                         len = svc_sock_names(buf, nfsd_serv, NULL);
 436                 unlock_kernel();
 437                 return len;
 438         }
 439         /* Either a single 'fd' number is written, in which
 440          * case it must be for a socket of a supported family/protocol,
 441          * and we use it as an nfsd socket, or
 442          * A '-' followed by the 'name' of a socket in which case
 443          * we close the socket.
 444          */
 445         if (isdigit(buf[0])) {
 446                 char *mesg = buf;
 447                 int fd;
 448                 int err;
 449                 err = get_int(&mesg, &fd);
 450                 if (err)
 451                         return -EINVAL;
 452                 if (fd < 0)
 453                         return -EINVAL;
 454                 err = nfsd_create_serv();
 455                 if (!err) {
 456                         int proto = 0;
 457                         err = svc_addsock(nfsd_serv, fd, buf, &proto);
 458                         /* Decrease the count, but don't shutdown the
 459                          * the service
 460                          */
 461                         if (err >= 0)
 462                                 lockd_up(proto);
 463                         nfsd_serv->sv_nrthreads--;
 464                 }
 465                 return err;
 466         }
 467         if (buf[0] == '-') {
 468                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
 469                 int len = 0;
 470                 if (!toclose)
 471                         return -ENOMEM;
 472                 lock_kernel();
 473                 if (nfsd_serv)
 474                         len = svc_sock_names(buf, nfsd_serv, toclose);
 475                 unlock_kernel();
 476                 kfree(toclose);
 477                 return len;
 478         }
 479         return -EINVAL;
 480 }
 481
 482 #ifdef CONFIG_NFSD_V4
 483 extern time_t nfs4_leasetime(void);
 484
 485 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 486 {
 487         /* if size > 10 seconds, call
 488          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 489          */
 490         char *mesg = buf;
 491         int rv;
 492
 493         if (size > 0) {
 494                 int lease;
 495                 rv = get_int(&mesg, &lease);
 496                 if (rv)
 497                         return rv;
 498                 if (lease < 10 || lease > 3600)
 499                         return -EINVAL;
 500                 nfs4_reset_lease(lease);
 501         }
 502         sprintf(buf, "%ld\n", nfs4_lease_time());
 503         return strlen(buf);
 504 }
 505
 506 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 507 {
 508         char *mesg = buf;
 509         char *recdir;
 510         int len, status;
 511
 512         if (size > PATH_MAX || buf[size-1] != '\n')
 513                 return -EINVAL;
 514         buf[size-1] = 0;
 515
 516         recdir = mesg;
 517         len = qword_get(&mesg, recdir, size);
 518         if (len <= 0)
 519                 return -EINVAL;
 520
 521         status = nfs4_reset_recoverydir(recdir);
 522         return strlen(buf);
 523 }
 524 #endif
 525
 526 /*----------------------------------------------------------------------------*/
 527 /*
 528  *      populating the filesystem.
 529  */
 530
 531 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 532 {
 533         static struct tree_descr nfsd_files[] = {
 534                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 535                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 536                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 537                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 538                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 539                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 540                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 541                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 542                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 543                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 544                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 545                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 546 #ifdef CONFIG_NFSD_V4
 547                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 548                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 549 #endif
 550                 /* last one */ {""}
 551         };
 552         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 553 }
 554
 555 static int nfsd_get_sb(struct file_system_type *fs_type,
 556         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 557 {
 558         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 559 }
 560
 561 static struct file_system_type nfsd_fs_type = {
 562         .owner          = THIS_MODULE,
 563         .name           = "nfsd",
 564         .get_sb         = nfsd_get_sb,
 565         .kill_sb        = kill_litter_super,
 566 };
 567
 568 static int __init init_nfsd(void)
 569 {
 570         int retval;
 571         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 572
 573         nfsd_stat_init();       /* Statistics */
 574         nfsd_cache_init();      /* RPC reply cache */
 575         nfsd_export_init();     /* Exports table */
 576         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 577         nfs4_state_init();      /* NFSv4 locking state */
 578         nfsd_idmap_init();      /* Name to ID mapping */
 579         if (proc_mkdir("fs/nfs", NULL)) {
 580                 struct proc_dir_entry *entry;
 581                 entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 582                 if (entry)
 583                         entry->proc_fops =  &exports_operations;
 584         }
 585         retval = register_filesystem(&nfsd_fs_type);
 586         if (retval) {
 587                 nfsd_export_shutdown();
 588                 nfsd_cache_shutdown();
 589                 remove_proc_entry("fs/nfs/exports", NULL);
 590                 remove_proc_entry("fs/nfs", NULL);
 591                 nfsd_stat_shutdown();
 592                 nfsd_lockd_shutdown();
 593         }
 594         return retval;
 595 }
 596
 597 static void __exit exit_nfsd(void)
 598 {
 599         nfsd_export_shutdown();
 600         nfsd_cache_shutdown();
 601         remove_proc_entry("fs/nfs/exports", NULL);
 602         remove_proc_entry("fs/nfs", NULL);
 603         nfsd_stat_shutdown();
 604         nfsd_lockd_shutdown();
 605         nfsd_idmap_shutdown();
 606         unregister_filesystem(&nfsd_fs_type);
 607 }
 608
 609 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 610 MODULE_LICENSE("GPL");
 611 module_init(init_nfsd)
 612 module_exit(exit_nfsd)