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/syscall.h>
  35 #include <linux/nfsd/interface.h>
  36
  37 #include <asm/uaccess.h>
  38
  39 int nfsd_port = 2049;
  40 unsigned int nfsd_portbits = 0;
  41 unsigned int nfsd_versbits = ~0;
  42
  43 /*
  44  *      We have a single directory with 9 nodes in it.
  45  */
  46 enum {
  47         NFSD_Root = 1,
  48         NFSD_Svc,
  49         NFSD_Add,
  50         NFSD_Del,
  51         NFSD_Export,
  52         NFSD_Unexport,
  53         NFSD_Getfd,
  54         NFSD_Getfs,
  55         NFSD_List,
  56         NFSD_Fh,
  57         NFSD_Threads,
  58         NFSD_Versions,
  59         NFSD_Ports,
  60         /*
  61          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  62          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  63          */
  64 #ifdef CONFIG_NFSD_V4
  65         NFSD_Leasetime,
  66         NFSD_RecoveryDir,
  67 #endif
  68 };
  69
  70 /*
  71  * write() for these nodes.
  72  */
  73 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  74 static ssize_t write_add(struct file *file, char *buf, size_t size);
  75 static ssize_t write_del(struct file *file, char *buf, size_t size);
  76 static ssize_t write_export(struct file *file, char *buf, size_t size);
  77 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  78 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  79 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  80 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  81 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  82 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  83 static ssize_t write_ports(struct file *file, char *buf, size_t size);
  84 #ifdef CONFIG_NFSD_V4
  85 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  86 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  87 #endif
  88
  89 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  90         [NFSD_Svc] = write_svc,
  91         [NFSD_Add] = write_add,
  92         [NFSD_Del] = write_del,
  93         [NFSD_Export] = write_export,
  94         [NFSD_Unexport] = write_unexport,
  95         [NFSD_Getfd] = write_getfd,
  96         [NFSD_Getfs] = write_getfs,
  97         [NFSD_Fh] = write_filehandle,
  98         [NFSD_Threads] = write_threads,
  99         [NFSD_Versions] = write_versions,
 100         [NFSD_Ports] = write_ports,
 101 #ifdef CONFIG_NFSD_V4
 102         [NFSD_Leasetime] = write_leasetime,
 103         [NFSD_RecoveryDir] = write_recoverydir,
 104 #endif
 105 };
 106
 107 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 108 {
 109         ino_t ino =  file->f_dentry->d_inode->i_ino;
 110         char *data;
 111         ssize_t rv;
 112
 113         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 114                 return -EINVAL;
 115
 116         data = simple_transaction_get(file, buf, size);
 117         if (IS_ERR(data))
 118                 return PTR_ERR(data);
 119
 120         rv =  write_op[ino](file, data, size);
 121         if (rv>0) {
 122                 simple_transaction_set(file, rv);
 123                 rv = size;
 124         }
 125         return rv;
 126 }
 127
 128 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 129 {
 130         if (! file->private_data) {
 131                 /* An attempt to read a transaction file without writing
 132                  * causes a 0-byte write so that the file can return
 133                  * state information
 134                  */
 135                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 136                 if (rv < 0)
 137                         return rv;
 138         }
 139         return simple_transaction_read(file, buf, size, pos);
 140 }
 141
 142 static const struct file_operations transaction_ops = {
 143         .write          = nfsctl_transaction_write,
 144         .read           = nfsctl_transaction_read,
 145         .release        = simple_transaction_release,
 146 };
 147
 148 extern struct seq_operations nfs_exports_op;
 149 static int exports_open(struct inode *inode, struct file *file)
 150 {
 151         return seq_open(file, &nfs_exports_op);
 152 }
 153
 154 static const struct file_operations exports_operations = {
 155         .open           = exports_open,
 156         .read           = seq_read,
 157         .llseek         = seq_lseek,
 158         .release        = seq_release,
 159 };
 160
 161 /*----------------------------------------------------------------------------*/
 162 /*
 163  * payload - write methods
 164  * If the method has a response, the response should be put in buf,
 165  * and the length returned.  Otherwise return 0 or and -error.
 166  */
 167
 168 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 169 {
 170         struct nfsctl_svc *data;
 171         if (size < sizeof(*data))
 172                 return -EINVAL;
 173         data = (struct nfsctl_svc*) buf;
 174         return nfsd_svc(data->svc_port, data->svc_nthreads);
 175 }
 176
 177 static ssize_t write_add(struct file *file, char *buf, size_t size)
 178 {
 179         struct nfsctl_client *data;
 180         if (size < sizeof(*data))
 181                 return -EINVAL;
 182         data = (struct nfsctl_client *)buf;
 183         return exp_addclient(data);
 184 }
 185
 186 static ssize_t write_del(struct file *file, char *buf, size_t size)
 187 {
 188         struct nfsctl_client *data;
 189         if (size < sizeof(*data))
 190                 return -EINVAL;
 191         data = (struct nfsctl_client *)buf;
 192         return exp_delclient(data);
 193 }
 194
 195 static ssize_t write_export(struct file *file, char *buf, size_t size)
 196 {
 197         struct nfsctl_export *data;
 198         if (size < sizeof(*data))
 199                 return -EINVAL;
 200         data = (struct nfsctl_export*)buf;
 201         return exp_export(data);
 202 }
 203
 204 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 205 {
 206         struct nfsctl_export *data;
 207
 208         if (size < sizeof(*data))
 209                 return -EINVAL;
 210         data = (struct nfsctl_export*)buf;
 211         return exp_unexport(data);
 212 }
 213
 214 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 215 {
 216         struct nfsctl_fsparm *data;
 217         struct sockaddr_in *sin;
 218         struct auth_domain *clp;
 219         int err = 0;
 220         struct knfsd_fh *res;
 221
 222         if (size < sizeof(*data))
 223                 return -EINVAL;
 224         data = (struct nfsctl_fsparm*)buf;
 225         err = -EPROTONOSUPPORT;
 226         if (data->gd_addr.sa_family != AF_INET)
 227                 goto out;
 228         sin = (struct sockaddr_in *)&data->gd_addr;
 229         if (data->gd_maxlen > NFS3_FHSIZE)
 230                 data->gd_maxlen = NFS3_FHSIZE;
 231
 232         res = (struct knfsd_fh*)buf;
 233
 234         exp_readlock();
 235         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 236                 err = -EPERM;
 237         else {
 238                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 239                 auth_domain_put(clp);
 240         }
 241         exp_readunlock();
 242         if (err == 0)
 243                 err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
 244  out:
 245         return err;
 246 }
 247
 248 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 249 {
 250         struct nfsctl_fdparm *data;
 251         struct sockaddr_in *sin;
 252         struct auth_domain *clp;
 253         int err = 0;
 254         struct knfsd_fh fh;
 255         char *res;
 256
 257         if (size < sizeof(*data))
 258                 return -EINVAL;
 259         data = (struct nfsctl_fdparm*)buf;
 260         err = -EPROTONOSUPPORT;
 261         if (data->gd_addr.sa_family != AF_INET)
 262                 goto out;
 263         err = -EINVAL;
 264         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 265                 goto out;
 266
 267         res = buf;
 268         sin = (struct sockaddr_in *)&data->gd_addr;
 269         exp_readlock();
 270         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 271                 err = -EPERM;
 272         else {
 273                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 274                 auth_domain_put(clp);
 275         }
 276         exp_readunlock();
 277
 278         if (err == 0) {
 279                 memset(res,0, NFS_FHSIZE);
 280                 memcpy(res, &fh.fh_base, fh.fh_size);
 281                 err = NFS_FHSIZE;
 282         }
 283  out:
 284         return err;
 285 }
 286
 287 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 288 {
 289         /* request is:
 290          *   domain path maxsize
 291          * response is
 292          *   filehandle
 293          *
 294          * qword quoting is used, so filehandle will be \x....
 295          */
 296         char *dname, *path;
 297         int maxsize;
 298         char *mesg = buf;
 299         int len;
 300         struct auth_domain *dom;
 301         struct knfsd_fh fh;
 302
 303         if (buf[size-1] != '\n')
 304                 return -EINVAL;
 305         buf[size-1] = 0;
 306
 307         dname = mesg;
 308         len = qword_get(&mesg, dname, size);
 309         if (len <= 0) return -EINVAL;
 310
 311         path = dname+len+1;
 312         len = qword_get(&mesg, path, size);
 313         if (len <= 0) return -EINVAL;
 314
 315         len = get_int(&mesg, &maxsize);
 316         if (len)
 317                 return len;
 318
 319         if (maxsize < NFS_FHSIZE)
 320                 return -EINVAL;
 321         if (maxsize > NFS3_FHSIZE)
 322                 maxsize = NFS3_FHSIZE;
 323
 324         if (qword_get(&mesg, mesg, size)>0)
 325                 return -EINVAL;
 326
 327         /* we have all the words, they are in buf.. */
 328         dom = unix_domain_find(dname);
 329         if (!dom)
 330                 return -ENOMEM;
 331
 332         len = exp_rootfh(dom, path, &fh,  maxsize);
 333         auth_domain_put(dom);
 334         if (len)
 335                 return len;
 336
 337         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 338         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 339         mesg[-1] = '\n';
 340         return mesg - buf;
 341 }
 342
 343 extern int nfsd_nrthreads(void);
 344
 345 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 346 {
 347         /* if size > 0, look for a number of threads and call nfsd_svc
 348          * then write out number of threads as reply
 349          */
 350         char *mesg = buf;
 351         int rv;
 352         if (size > 0) {
 353                 int newthreads;
 354                 rv = get_int(&mesg, &newthreads);
 355                 if (rv)
 356                         return rv;
 357                 if (newthreads <0)
 358                         return -EINVAL;
 359                 rv = nfsd_svc(2049, newthreads);
 360                 if (rv)
 361                         return rv;
 362         }
 363         sprintf(buf, "%d\n", nfsd_nrthreads());
 364         return strlen(buf);
 365 }
 366 static ssize_t write_ports(struct file *file, char *buf, size_t size)
 367 {
 368         /*
 369          * Format:
 370          *   family proto proto address port
 371          */
 372         char *mesg = buf;
 373         char *family, *udp, *tcp, *addr;
 374         int len, port = 0;
 375         ssize_t tlen = 0;
 376
 377         if (buf[size-1] != '\n')
 378                 return -EINVAL;
 379         buf[size-1] = 0;
 380
 381         family = mesg;
 382         len = qword_get(&mesg, family, size);
 383         if (len <= 0) return -EINVAL;
 384
 385         tlen += len;
 386         udp = family+len+1;
 387         len = qword_get(&mesg, udp, size);
 388         if (len <= 0) return -EINVAL;
 389
 390         tlen += len;
 391         tcp = udp+len+1;
 392         len = qword_get(&mesg, tcp, size);
 393         if (len <= 0) return -EINVAL;
 394
 395         tlen += len;
 396         addr = tcp+len+1;
 397         len = qword_get(&mesg, addr, size);
 398         if (len <= 0) return -EINVAL;
 399
 400         len = get_int(&mesg, &port);
 401         if (len)
 402                 return len;
 403
 404         tlen += sizeof(port);
 405         if (port)
 406                 nfsd_port = port;
 407
 408         if (strcmp(tcp, "tcp") == 0 || strcmp(tcp, "TCP") == 0)
 409                 NFSCTL_TCPSET(nfsd_portbits);
 410         else
 411                 NFSCTL_TCPUNSET(nfsd_portbits);
 412
 413         if (strcmp(udp, "udp") == 0 || strcmp(udp, "UDP") == 0)
 414                 NFSCTL_UDPSET(nfsd_portbits);
 415         else
 416                 NFSCTL_UDPUNSET(nfsd_portbits);
 417
 418         return tlen;
 419 }
 420 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 421 {
 422         /*
 423          * Format:
 424          *   [-/+]vers [-/+]vers ...
 425          */
 426         char *mesg = buf;
 427         char *vers, sign;
 428         int len, num;
 429         ssize_t tlen = 0;
 430         char *sep;
 431
 432         if (size>0) {
 433                 if (nfsd_serv)
 434                         return -EBUSY;
 435                 if (buf[size-1] != '\n')
 436                         return -EINVAL;
 437                 buf[size-1] = 0;
 438
 439                 vers = mesg;
 440                 len = qword_get(&mesg, vers, size);
 441                 if (len <= 0) return -EINVAL;
 442                 do {
 443                         sign = *vers;
 444                         if (sign == '+' || sign == '-')
 445                                 num = simple_strtol((vers+1), NULL, 0);
 446                         else
 447                                 num = simple_strtol(vers, NULL, 0);
 448                         switch(num) {
 449                         case 2:
 450                         case 3:
 451                         case 4:
 452                                 if (sign != '-')
 453                                         NFSCTL_VERSET(nfsd_versbits, num);
 454                                 else
 455                                         NFSCTL_VERUNSET(nfsd_versbits, num);
 456                                 break;
 457                         default:
 458                                 return -EINVAL;
 459                         }
 460                         vers += len + 1;
 461                         tlen += len;
 462                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 463                 /* If all get turned off, turn them back on, as
 464                  * having no versions is BAD
 465                  */
 466                 if ((nfsd_versbits & NFSCTL_VERALL)==0)
 467                         nfsd_versbits = NFSCTL_VERALL;
 468         }
 469         /* Now write current state into reply buffer */
 470         len = 0;
 471         sep = "";
 472         for (num=2 ; num <= 4 ; num++)
 473                 if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
 474                         len += sprintf(buf+len, "%s%c%d", sep,
 475                                        NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
 476                                        num);
 477                         sep = " ";
 478                 }
 479         len += sprintf(buf+len, "\n");
 480         return len;
 481 }
 482
 483 #ifdef CONFIG_NFSD_V4
 484 extern time_t nfs4_leasetime(void);
 485
 486 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 487 {
 488         /* if size > 10 seconds, call
 489          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 490          */
 491         char *mesg = buf;
 492         int rv;
 493
 494         if (size > 0) {
 495                 int lease;
 496                 rv = get_int(&mesg, &lease);
 497                 if (rv)
 498                         return rv;
 499                 if (lease < 10 || lease > 3600)
 500                         return -EINVAL;
 501                 nfs4_reset_lease(lease);
 502         }
 503         sprintf(buf, "%ld\n", nfs4_lease_time());
 504         return strlen(buf);
 505 }
 506
 507 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 508 {
 509         char *mesg = buf;
 510         char *recdir;
 511         int len, status;
 512
 513         if (size > PATH_MAX || buf[size-1] != '\n')
 514                 return -EINVAL;
 515         buf[size-1] = 0;
 516
 517         recdir = mesg;
 518         len = qword_get(&mesg, recdir, size);
 519         if (len <= 0)
 520                 return -EINVAL;
 521
 522         status = nfs4_reset_recoverydir(recdir);
 523         return strlen(buf);
 524 }
 525 #endif
 526
 527 /*----------------------------------------------------------------------------*/
 528 /*
 529  *      populating the filesystem.
 530  */
 531
 532 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 533 {
 534         static struct tree_descr nfsd_files[] = {
 535                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 536                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 537                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 538                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 539                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 540                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 541                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 542                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 543                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 544                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 545                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 546                 [NFSD_Ports] = {"ports", &transaction_ops, S_IWUSR|S_IRUSR},
 547 #ifdef CONFIG_NFSD_V4
 548                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 549                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 550 #endif
 551                 /* last one */ {""}
 552         };
 553         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 554 }
 555
 556 static struct super_block *nfsd_get_sb(struct file_system_type *fs_type,
 557         int flags, const char *dev_name, void *data)
 558 {
 559         return get_sb_single(fs_type, flags, data, nfsd_fill_super);
 560 }
 561
 562 static struct file_system_type nfsd_fs_type = {
 563         .owner          = THIS_MODULE,
 564         .name           = "nfsd",
 565         .get_sb         = nfsd_get_sb,
 566         .kill_sb        = kill_litter_super,
 567 };
 568
 569 static int __init init_nfsd(void)
 570 {
 571         int retval;
 572         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 573
 574         nfsd_stat_init();       /* Statistics */
 575         nfsd_cache_init();      /* RPC reply cache */
 576         nfsd_export_init();     /* Exports table */
 577         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 578         nfs4_state_init();      /* NFSv4 locking state */
 579         nfsd_idmap_init();      /* Name to ID mapping */
 580         if (proc_mkdir("fs/nfs", NULL)) {
 581                 struct proc_dir_entry *entry;
 582                 entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 583                 if (entry)
 584                         entry->proc_fops =  &exports_operations;
 585         }
 586         retval = register_filesystem(&nfsd_fs_type);
 587         if (retval) {
 588                 nfsd_export_shutdown();
 589                 nfsd_cache_shutdown();
 590                 remove_proc_entry("fs/nfs/exports", NULL);
 591                 remove_proc_entry("fs/nfs", NULL);
 592                 nfsd_stat_shutdown();
 593                 nfsd_lockd_shutdown();
 594         }
 595         return retval;
 596 }
 597
 598 static void __exit exit_nfsd(void)
 599 {
 600         nfsd_export_shutdown();
 601         nfsd_cache_shutdown();
 602         remove_proc_entry("fs/nfs/exports", NULL);
 603         remove_proc_entry("fs/nfs", NULL);
 604         nfsd_stat_shutdown();
 605         nfsd_lockd_shutdown();
 606         nfsd_idmap_shutdown();
 607         unregister_filesystem(&nfsd_fs_type);
 608 }
 609
 610 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 611 MODULE_LICENSE("GPL");
 612 module_init(init_nfsd)
 613 module_exit(exit_nfsd)