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_Versions, 39 NFSD_Ports, 40 NFSD_MaxBlkSize, 41 NFSD_SupportedEnctypes, 42 /* 43 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 44 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 45 */ 46 #ifdef CONFIG_NFSD_V4 47 NFSD_Leasetime, 48 NFSD_Gracetime, 49 NFSD_RecoveryDir, 50 #endif 51 }; 52 53 /* 54 * write() for these nodes. 55 */ 56 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 57 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 58 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 59 static ssize_t write_threads(struct file *file, char *buf, size_t size); 60 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 61 static ssize_t write_versions(struct file *file, char *buf, size_t size); 62 static ssize_t write_ports(struct file *file, char *buf, size_t size); 63 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 64 #ifdef CONFIG_NFSD_V4 65 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 66 static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 67 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 68 #endif 69 70 static ssize_t (*write_op[])(struct file *, char *, size_t) = { 71 [NFSD_Fh] = write_filehandle, 72 [NFSD_FO_UnlockIP] = write_unlock_ip, 73 [NFSD_FO_UnlockFS] = write_unlock_fs, 74 [NFSD_Threads] = write_threads, 75 [NFSD_Pool_Threads] = write_pool_threads, 76 [NFSD_Versions] = write_versions, 77 [NFSD_Ports] = write_ports, 78 [NFSD_MaxBlkSize] = write_maxblksize, 79 #ifdef CONFIG_NFSD_V4 80 [NFSD_Leasetime] = write_leasetime, 81 [NFSD_Gracetime] = write_gracetime, 82 [NFSD_RecoveryDir] = write_recoverydir, 83 #endif 84 }; 85 86 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 87 { 88 ino_t ino = file_inode(file)->i_ino; 89 char *data; 90 ssize_t rv; 91 92 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 93 return -EINVAL; 94 95 data = simple_transaction_get(file, buf, size); 96 if (IS_ERR(data)) 97 return PTR_ERR(data); 98 99 rv = write_op[ino](file, data, size); 100 if (rv >= 0) { 101 simple_transaction_set(file, rv); 102 rv = size; 103 } 104 return rv; 105 } 106 107 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 108 { 109 if (! file->private_data) { 110 /* An attempt to read a transaction file without writing 111 * causes a 0-byte write so that the file can return 112 * state information 113 */ 114 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 115 if (rv < 0) 116 return rv; 117 } 118 return simple_transaction_read(file, buf, size, pos); 119 } 120 121 static const struct file_operations transaction_ops = { 122 .write = nfsctl_transaction_write, 123 .read = nfsctl_transaction_read, 124 .release = simple_transaction_release, 125 .llseek = default_llseek, 126 }; 127 128 static int exports_net_open(struct net *net, struct file *file) 129 { 130 int err; 131 struct seq_file *seq; 132 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 133 134 err = seq_open(file, &nfs_exports_op); 135 if (err) 136 return err; 137 138 seq = file->private_data; 139 seq->private = nn->svc_export_cache; 140 return 0; 141 } 142 143 static int exports_proc_open(struct inode *inode, struct file *file) 144 { 145 return exports_net_open(current->nsproxy->net_ns, file); 146 } 147 148 static const struct file_operations exports_proc_operations = { 149 .open = exports_proc_open, 150 .read = seq_read, 151 .llseek = seq_lseek, 152 .release = seq_release, 153 .owner = THIS_MODULE, 154 }; 155 156 static int exports_nfsd_open(struct inode *inode, struct file *file) 157 { 158 return exports_net_open(inode->i_sb->s_fs_info, file); 159 } 160 161 static const struct file_operations exports_nfsd_operations = { 162 .open = exports_nfsd_open, 163 .read = seq_read, 164 .llseek = seq_lseek, 165 .release = seq_release, 166 .owner = THIS_MODULE, 167 }; 168 169 static int export_features_show(struct seq_file *m, void *v) 170 { 171 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); 172 return 0; 173 } 174 175 static int export_features_open(struct inode *inode, struct file *file) 176 { 177 return single_open(file, export_features_show, NULL); 178 } 179 180 static struct file_operations export_features_operations = { 181 .open = export_features_open, 182 .read = seq_read, 183 .llseek = seq_lseek, 184 .release = single_release, 185 }; 186 187 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE) 188 static int supported_enctypes_show(struct seq_file *m, void *v) 189 { 190 seq_printf(m, KRB5_SUPPORTED_ENCTYPES); 191 return 0; 192 } 193 194 static int supported_enctypes_open(struct inode *inode, struct file *file) 195 { 196 return single_open(file, supported_enctypes_show, NULL); 197 } 198 199 static struct file_operations supported_enctypes_ops = { 200 .open = supported_enctypes_open, 201 .read = seq_read, 202 .llseek = seq_lseek, 203 .release = single_release, 204 }; 205 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */ 206 207 static const struct file_operations pool_stats_operations = { 208 .open = nfsd_pool_stats_open, 209 .read = seq_read, 210 .llseek = seq_lseek, 211 .release = nfsd_pool_stats_release, 212 .owner = THIS_MODULE, 213 }; 214 215 /*----------------------------------------------------------------------------*/ 216 /* 217 * payload - write methods 218 */ 219 220 221 /** 222 * write_unlock_ip - Release all locks used by a client 223 * 224 * Experimental. 225 * 226 * Input: 227 * buf: '\n'-terminated C string containing a 228 * presentation format IP address 229 * size: length of C string in @buf 230 * Output: 231 * On success: returns zero if all specified locks were released; 232 * returns one if one or more locks were not released 233 * On error: return code is negative errno value 234 */ 235 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) 236 { 237 struct sockaddr_storage address; 238 struct sockaddr *sap = (struct sockaddr *)&address; 239 size_t salen = sizeof(address); 240 char *fo_path; 241 struct net *net = file->f_dentry->d_sb->s_fs_info; 242 243 /* sanity check */ 244 if (size == 0) 245 return -EINVAL; 246 247 if (buf[size-1] != '\n') 248 return -EINVAL; 249 250 fo_path = buf; 251 if (qword_get(&buf, fo_path, size) < 0) 252 return -EINVAL; 253 254 if (rpc_pton(net, fo_path, size, sap, salen) == 0) 255 return -EINVAL; 256 257 return nlmsvc_unlock_all_by_ip(sap); 258 } 259 260 /** 261 * write_unlock_fs - Release all locks on a local file system 262 * 263 * Experimental. 264 * 265 * Input: 266 * buf: '\n'-terminated C string containing the 267 * absolute pathname of a local file system 268 * size: length of C string in @buf 269 * Output: 270 * On success: returns zero if all specified locks were released; 271 * returns one if one or more locks were not released 272 * On error: return code is negative errno value 273 */ 274 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) 275 { 276 struct path path; 277 char *fo_path; 278 int error; 279 280 /* sanity check */ 281 if (size == 0) 282 return -EINVAL; 283 284 if (buf[size-1] != '\n') 285 return -EINVAL; 286 287 fo_path = buf; 288 if (qword_get(&buf, fo_path, size) < 0) 289 return -EINVAL; 290 291 error = kern_path(fo_path, 0, &path); 292 if (error) 293 return error; 294 295 /* 296 * XXX: Needs better sanity checking. Otherwise we could end up 297 * releasing locks on the wrong file system. 298 * 299 * For example: 300 * 1. Does the path refer to a directory? 301 * 2. Is that directory a mount point, or 302 * 3. Is that directory the root of an exported file system? 303 */ 304 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb); 305 306 path_put(&path); 307 return error; 308 } 309 310 /** 311 * write_filehandle - Get a variable-length NFS file handle by path 312 * 313 * On input, the buffer contains a '\n'-terminated C string comprised of 314 * three alphanumeric words separated by whitespace. The string may 315 * contain escape sequences. 316 * 317 * Input: 318 * buf: 319 * domain: client domain name 320 * path: export pathname 321 * maxsize: numeric maximum size of 322 * @buf 323 * size: length of C string in @buf 324 * Output: 325 * On success: passed-in buffer filled with '\n'-terminated C 326 * string containing a ASCII hex text version 327 * of the NFS file handle; 328 * return code is the size in bytes of the string 329 * On error: return code is negative errno value 330 */ 331 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 332 { 333 char *dname, *path; 334 int uninitialized_var(maxsize); 335 char *mesg = buf; 336 int len; 337 struct auth_domain *dom; 338 struct knfsd_fh fh; 339 struct net *net = file->f_dentry->d_sb->s_fs_info; 340 341 if (size == 0) 342 return -EINVAL; 343 344 if (buf[size-1] != '\n') 345 return -EINVAL; 346 buf[size-1] = 0; 347 348 dname = mesg; 349 len = qword_get(&mesg, dname, size); 350 if (len <= 0) 351 return -EINVAL; 352 353 path = dname+len+1; 354 len = qword_get(&mesg, path, size); 355 if (len <= 0) 356 return -EINVAL; 357 358 len = get_int(&mesg, &maxsize); 359 if (len) 360 return len; 361 362 if (maxsize < NFS_FHSIZE) 363 return -EINVAL; 364 if (maxsize > NFS3_FHSIZE) 365 maxsize = NFS3_FHSIZE; 366 367 if (qword_get(&mesg, mesg, size)>0) 368 return -EINVAL; 369 370 /* we have all the words, they are in buf.. */ 371 dom = unix_domain_find(dname); 372 if (!dom) 373 return -ENOMEM; 374 375 len = exp_rootfh(net, dom, path, &fh, maxsize); 376 auth_domain_put(dom); 377 if (len) 378 return len; 379 380 mesg = buf; 381 len = SIMPLE_TRANSACTION_LIMIT; 382 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); 383 mesg[-1] = '\n'; 384 return mesg - buf; 385 } 386 387 /** 388 * write_threads - Start NFSD, or report the current number of running threads 389 * 390 * Input: 391 * buf: ignored 392 * size: zero 393 * Output: 394 * On success: passed-in buffer filled with '\n'-terminated C 395 * string numeric value representing the number of 396 * running NFSD threads; 397 * return code is the size in bytes of the string 398 * On error: return code is zero 399 * 400 * OR 401 * 402 * Input: 403 * buf: C string containing an unsigned 404 * integer value representing the 405 * number of NFSD threads to start 406 * size: non-zero length of C string in @buf 407 * Output: 408 * On success: NFS service is started; 409 * passed-in buffer filled with '\n'-terminated C 410 * string numeric value representing the number of 411 * running NFSD threads; 412 * return code is the size in bytes of the string 413 * On error: return code is zero or a negative errno value 414 */ 415 static ssize_t write_threads(struct file *file, char *buf, size_t size) 416 { 417 char *mesg = buf; 418 int rv; 419 struct net *net = file->f_dentry->d_sb->s_fs_info; 420 421 if (size > 0) { 422 int newthreads; 423 rv = get_int(&mesg, &newthreads); 424 if (rv) 425 return rv; 426 if (newthreads < 0) 427 return -EINVAL; 428 rv = nfsd_svc(newthreads, net); 429 if (rv < 0) 430 return rv; 431 } else 432 rv = nfsd_nrthreads(net); 433 434 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 435 } 436 437 /** 438 * write_pool_threads - Set or report the current number of threads per pool 439 * 440 * Input: 441 * buf: ignored 442 * size: zero 443 * 444 * OR 445 * 446 * Input: 447 * buf: C string containing whitespace- 448 * separated unsigned integer values 449 * representing the number of NFSD 450 * threads to start in each pool 451 * size: non-zero length of C string in @buf 452 * Output: 453 * On success: passed-in buffer filled with '\n'-terminated C 454 * string containing integer values representing the 455 * number of NFSD threads in each pool; 456 * return code is the size in bytes of the string 457 * On error: return code is zero or a negative errno value 458 */ 459 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 460 { 461 /* if size > 0, look for an array of number of threads per node 462 * and apply them then write out number of threads per node as reply 463 */ 464 char *mesg = buf; 465 int i; 466 int rv; 467 int len; 468 int npools; 469 int *nthreads; 470 struct net *net = file->f_dentry->d_sb->s_fs_info; 471 472 mutex_lock(&nfsd_mutex); 473 npools = nfsd_nrpools(net); 474 if (npools == 0) { 475 /* 476 * NFS is shut down. The admin can start it by 477 * writing to the threads file but NOT the pool_threads 478 * file, sorry. Report zero threads. 479 */ 480 mutex_unlock(&nfsd_mutex); 481 strcpy(buf, "0\n"); 482 return strlen(buf); 483 } 484 485 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 486 rv = -ENOMEM; 487 if (nthreads == NULL) 488 goto out_free; 489 490 if (size > 0) { 491 for (i = 0; i < npools; i++) { 492 rv = get_int(&mesg, &nthreads[i]); 493 if (rv == -ENOENT) 494 break; /* fewer numbers than pools */ 495 if (rv) 496 goto out_free; /* syntax error */ 497 rv = -EINVAL; 498 if (nthreads[i] < 0) 499 goto out_free; 500 } 501 rv = nfsd_set_nrthreads(i, nthreads, net); 502 if (rv) 503 goto out_free; 504 } 505 506 rv = nfsd_get_nrthreads(npools, nthreads, net); 507 if (rv) 508 goto out_free; 509 510 mesg = buf; 511 size = SIMPLE_TRANSACTION_LIMIT; 512 for (i = 0; i < npools && size > 0; i++) { 513 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 514 len = strlen(mesg); 515 size -= len; 516 mesg += len; 517 } 518 rv = mesg - buf; 519 out_free: 520 kfree(nthreads); 521 mutex_unlock(&nfsd_mutex); 522 return rv; 523 } 524 525 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 526 { 527 char *mesg = buf; 528 char *vers, *minorp, sign; 529 int len, num, remaining; 530 unsigned minor; 531 ssize_t tlen = 0; 532 char *sep; 533 struct net *net = file->f_dentry->d_sb->s_fs_info; 534 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 535 536 if (size>0) { 537 if (nn->nfsd_serv) 538 /* Cannot change versions without updating 539 * nn->nfsd_serv->sv_xdrsize, and reallocing 540 * rq_argp and rq_resp 541 */ 542 return -EBUSY; 543 if (buf[size-1] != '\n') 544 return -EINVAL; 545 buf[size-1] = 0; 546 547 vers = mesg; 548 len = qword_get(&mesg, vers, size); 549 if (len <= 0) return -EINVAL; 550 do { 551 sign = *vers; 552 if (sign == '+' || sign == '-') 553 num = simple_strtol((vers+1), &minorp, 0); 554 else 555 num = simple_strtol(vers, &minorp, 0); 556 if (*minorp == '.') { 557 if (num != 4) 558 return -EINVAL; 559 minor = simple_strtoul(minorp+1, NULL, 0); 560 if (minor == 0) 561 return -EINVAL; 562 if (nfsd_minorversion(minor, sign == '-' ? 563 NFSD_CLEAR : NFSD_SET) < 0) 564 return -EINVAL; 565 goto next; 566 } 567 switch(num) { 568 case 2: 569 case 3: 570 case 4: 571 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); 572 break; 573 default: 574 return -EINVAL; 575 } 576 next: 577 vers += len + 1; 578 } while ((len = qword_get(&mesg, vers, size)) > 0); 579 /* If all get turned off, turn them back on, as 580 * having no versions is BAD 581 */ 582 nfsd_reset_versions(); 583 } 584 585 /* Now write current state into reply buffer */ 586 len = 0; 587 sep = ""; 588 remaining = SIMPLE_TRANSACTION_LIMIT; 589 for (num=2 ; num <= 4 ; num++) 590 if (nfsd_vers(num, NFSD_AVAIL)) { 591 len = snprintf(buf, remaining, "%s%c%d", sep, 592 nfsd_vers(num, NFSD_TEST)?'+':'-', 593 num); 594 sep = " "; 595 596 if (len > remaining) 597 break; 598 remaining -= len; 599 buf += len; 600 tlen += len; 601 } 602 if (nfsd_vers(4, NFSD_AVAIL)) 603 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION; 604 minor++) { 605 len = snprintf(buf, remaining, " %c4.%u", 606 (nfsd_vers(4, NFSD_TEST) && 607 nfsd_minorversion(minor, NFSD_TEST)) ? 608 '+' : '-', 609 minor); 610 611 if (len > remaining) 612 break; 613 remaining -= len; 614 buf += len; 615 tlen += len; 616 } 617 618 len = snprintf(buf, remaining, "\n"); 619 if (len > remaining) 620 return -EINVAL; 621 return tlen + len; 622 } 623 624 /** 625 * write_versions - Set or report the available NFS protocol versions 626 * 627 * Input: 628 * buf: ignored 629 * size: zero 630 * Output: 631 * On success: passed-in buffer filled with '\n'-terminated C 632 * string containing positive or negative integer 633 * values representing the current status of each 634 * protocol version; 635 * return code is the size in bytes of the string 636 * On error: return code is zero or a negative errno value 637 * 638 * OR 639 * 640 * Input: 641 * buf: C string containing whitespace- 642 * separated positive or negative 643 * integer values representing NFS 644 * protocol versions to enable ("+n") 645 * or disable ("-n") 646 * size: non-zero length of C string in @buf 647 * Output: 648 * On success: status of zero or more protocol versions has 649 * been updated; passed-in buffer filled with 650 * '\n'-terminated C string containing positive 651 * or negative integer values representing the 652 * current status of each protocol version; 653 * return code is the size in bytes of the string 654 * On error: return code is zero or a negative errno value 655 */ 656 static ssize_t write_versions(struct file *file, char *buf, size_t size) 657 { 658 ssize_t rv; 659 660 mutex_lock(&nfsd_mutex); 661 rv = __write_versions(file, buf, size); 662 mutex_unlock(&nfsd_mutex); 663 return rv; 664 } 665 666 /* 667 * Zero-length write. Return a list of NFSD's current listener 668 * transports. 669 */ 670 static ssize_t __write_ports_names(char *buf, struct net *net) 671 { 672 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 673 674 if (nn->nfsd_serv == NULL) 675 return 0; 676 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 677 } 678 679 /* 680 * A single 'fd' number was written, in which case it must be for 681 * a socket of a supported family/protocol, and we use it as an 682 * nfsd listener. 683 */ 684 static ssize_t __write_ports_addfd(char *buf, struct net *net) 685 { 686 char *mesg = buf; 687 int fd, err; 688 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 689 690 err = get_int(&mesg, &fd); 691 if (err != 0 || fd < 0) 692 return -EINVAL; 693 694 err = nfsd_create_serv(net); 695 if (err != 0) 696 return err; 697 698 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT); 699 if (err < 0) { 700 nfsd_destroy(net); 701 return err; 702 } 703 704 /* Decrease the count, but don't shut down the service */ 705 nn->nfsd_serv->sv_nrthreads--; 706 return err; 707 } 708 709 /* 710 * A transport listener is added by writing it's transport name and 711 * a port number. 712 */ 713 static ssize_t __write_ports_addxprt(char *buf, struct net *net) 714 { 715 char transport[16]; 716 struct svc_xprt *xprt; 717 int port, err; 718 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 719 720 if (sscanf(buf, "%15s %5u", transport, &port) != 2) 721 return -EINVAL; 722 723 if (port < 1 || port > USHRT_MAX) 724 return -EINVAL; 725 726 err = nfsd_create_serv(net); 727 if (err != 0) 728 return err; 729 730 err = svc_create_xprt(nn->nfsd_serv, transport, net, 731 PF_INET, port, SVC_SOCK_ANONYMOUS); 732 if (err < 0) 733 goto out_err; 734 735 err = svc_create_xprt(nn->nfsd_serv, transport, net, 736 PF_INET6, port, SVC_SOCK_ANONYMOUS); 737 if (err < 0 && err != -EAFNOSUPPORT) 738 goto out_close; 739 740 /* Decrease the count, but don't shut down the service */ 741 nn->nfsd_serv->sv_nrthreads--; 742 return 0; 743 out_close: 744 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port); 745 if (xprt != NULL) { 746 svc_close_xprt(xprt); 747 svc_xprt_put(xprt); 748 } 749 out_err: 750 nfsd_destroy(net); 751 return err; 752 } 753 754 static ssize_t __write_ports(struct file *file, char *buf, size_t size, 755 struct net *net) 756 { 757 if (size == 0) 758 return __write_ports_names(buf, net); 759 760 if (isdigit(buf[0])) 761 return __write_ports_addfd(buf, net); 762 763 if (isalpha(buf[0])) 764 return __write_ports_addxprt(buf, net); 765 766 return -EINVAL; 767 } 768 769 /** 770 * write_ports - Pass a socket file descriptor or transport name to listen on 771 * 772 * Input: 773 * buf: ignored 774 * size: zero 775 * Output: 776 * On success: passed-in buffer filled with a '\n'-terminated C 777 * string containing a whitespace-separated list of 778 * named NFSD listeners; 779 * return code is the size in bytes of the string 780 * On error: return code is zero or a negative errno value 781 * 782 * OR 783 * 784 * Input: 785 * buf: C string containing an unsigned 786 * integer value representing a bound 787 * but unconnected socket that is to be 788 * used as an NFSD listener; listen(3) 789 * must be called for a SOCK_STREAM 790 * socket, otherwise it is ignored 791 * size: non-zero length of C string in @buf 792 * Output: 793 * On success: NFS service is started; 794 * passed-in buffer filled with a '\n'-terminated C 795 * string containing a unique alphanumeric name of 796 * the listener; 797 * return code is the size in bytes of the string 798 * On error: return code is a negative errno value 799 * 800 * OR 801 * 802 * Input: 803 * buf: C string containing a transport 804 * name and an unsigned integer value 805 * representing the port to listen on, 806 * separated by whitespace 807 * size: non-zero length of C string in @buf 808 * Output: 809 * On success: returns zero; NFS service is started 810 * On error: return code is a negative errno value 811 */ 812 static ssize_t write_ports(struct file *file, char *buf, size_t size) 813 { 814 ssize_t rv; 815 struct net *net = file->f_dentry->d_sb->s_fs_info; 816 817 mutex_lock(&nfsd_mutex); 818 rv = __write_ports(file, buf, size, net); 819 mutex_unlock(&nfsd_mutex); 820 return rv; 821 } 822 823 824 int nfsd_max_blksize; 825 826 /** 827 * write_maxblksize - Set or report the current NFS blksize 828 * 829 * Input: 830 * buf: ignored 831 * size: zero 832 * 833 * OR 834 * 835 * Input: 836 * buf: C string containing an unsigned 837 * integer value representing the new 838 * NFS blksize 839 * size: non-zero length of C string in @buf 840 * Output: 841 * On success: passed-in buffer filled with '\n'-terminated C string 842 * containing numeric value of the current NFS blksize 843 * setting; 844 * return code is the size in bytes of the string 845 * On error: return code is zero or a negative errno value 846 */ 847 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 848 { 849 char *mesg = buf; 850 struct net *net = file->f_dentry->d_sb->s_fs_info; 851 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 852 853 if (size > 0) { 854 int bsize; 855 int rv = get_int(&mesg, &bsize); 856 if (rv) 857 return rv; 858 /* force bsize into allowed range and 859 * required alignment. 860 */ 861 if (bsize < 1024) 862 bsize = 1024; 863 if (bsize > NFSSVC_MAXBLKSIZE) 864 bsize = NFSSVC_MAXBLKSIZE; 865 bsize &= ~(1024-1); 866 mutex_lock(&nfsd_mutex); 867 if (nn->nfsd_serv) { 868 mutex_unlock(&nfsd_mutex); 869 return -EBUSY; 870 } 871 nfsd_max_blksize = bsize; 872 mutex_unlock(&nfsd_mutex); 873 } 874 875 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 876 nfsd_max_blksize); 877 } 878 879 #ifdef CONFIG_NFSD_V4 880 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, 881 time_t *time, struct nfsd_net *nn) 882 { 883 char *mesg = buf; 884 int rv, i; 885 886 if (size > 0) { 887 if (nn->nfsd_serv) 888 return -EBUSY; 889 rv = get_int(&mesg, &i); 890 if (rv) 891 return rv; 892 /* 893 * Some sanity checking. We don't have a reason for 894 * these particular numbers, but problems with the 895 * extremes are: 896 * - Too short: the briefest network outage may 897 * cause clients to lose all their locks. Also, 898 * the frequent polling may be wasteful. 899 * - Too long: do you really want reboot recovery 900 * to take more than an hour? Or to make other 901 * clients wait an hour before being able to 902 * revoke a dead client's locks? 903 */ 904 if (i < 10 || i > 3600) 905 return -EINVAL; 906 *time = i; 907 } 908 909 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time); 910 } 911 912 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, 913 time_t *time, struct nfsd_net *nn) 914 { 915 ssize_t rv; 916 917 mutex_lock(&nfsd_mutex); 918 rv = __nfsd4_write_time(file, buf, size, time, nn); 919 mutex_unlock(&nfsd_mutex); 920 return rv; 921 } 922 923 /** 924 * write_leasetime - Set or report the current NFSv4 lease time 925 * 926 * Input: 927 * buf: ignored 928 * size: zero 929 * 930 * OR 931 * 932 * Input: 933 * buf: C string containing an unsigned 934 * integer value representing the new 935 * NFSv4 lease expiry time 936 * size: non-zero length of C string in @buf 937 * Output: 938 * On success: passed-in buffer filled with '\n'-terminated C 939 * string containing unsigned integer value of the 940 * current lease expiry time; 941 * return code is the size in bytes of the string 942 * On error: return code is zero or a negative errno value 943 */ 944 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 945 { 946 struct net *net = file->f_dentry->d_sb->s_fs_info; 947 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 948 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); 949 } 950 951 /** 952 * write_gracetime - Set or report current NFSv4 grace period time 953 * 954 * As above, but sets the time of the NFSv4 grace period. 955 * 956 * Note this should never be set to less than the *previous* 957 * lease-period time, but we don't try to enforce this. (In the common 958 * case (a new boot), we don't know what the previous lease time was 959 * anyway.) 960 */ 961 static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 962 { 963 struct net *net = file->f_dentry->d_sb->s_fs_info; 964 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 965 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); 966 } 967 968 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, 969 struct nfsd_net *nn) 970 { 971 char *mesg = buf; 972 char *recdir; 973 int len, status; 974 975 if (size > 0) { 976 if (nn->nfsd_serv) 977 return -EBUSY; 978 if (size > PATH_MAX || buf[size-1] != '\n') 979 return -EINVAL; 980 buf[size-1] = 0; 981 982 recdir = mesg; 983 len = qword_get(&mesg, recdir, size); 984 if (len <= 0) 985 return -EINVAL; 986 987 status = nfs4_reset_recoverydir(recdir); 988 if (status) 989 return status; 990 } 991 992 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 993 nfs4_recoverydir()); 994 } 995 996 /** 997 * write_recoverydir - Set or report the pathname of the recovery directory 998 * 999 * Input: 1000 * buf: ignored 1001 * size: zero 1002 * 1003 * OR 1004 * 1005 * Input: 1006 * buf: C string containing the pathname 1007 * of the directory on a local file 1008 * system containing permanent NFSv4 1009 * recovery data 1010 * size: non-zero length of C string in @buf 1011 * Output: 1012 * On success: passed-in buffer filled with '\n'-terminated C string 1013 * containing the current recovery pathname setting; 1014 * return code is the size in bytes of the string 1015 * On error: return code is zero or a negative errno value 1016 */ 1017 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1018 { 1019 ssize_t rv; 1020 struct net *net = file->f_dentry->d_sb->s_fs_info; 1021 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1022 1023 mutex_lock(&nfsd_mutex); 1024 rv = __write_recoverydir(file, buf, size, nn); 1025 mutex_unlock(&nfsd_mutex); 1026 return rv; 1027 } 1028 1029 #endif 1030 1031 /*----------------------------------------------------------------------------*/ 1032 /* 1033 * populating the filesystem. 1034 */ 1035 1036 static int nfsd_fill_super(struct super_block * sb, void * data, int silent) 1037 { 1038 static struct tree_descr nfsd_files[] = { 1039 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, 1040 [NFSD_Export_features] = {"export_features", 1041 &export_features_operations, S_IRUGO}, 1042 [NFSD_FO_UnlockIP] = {"unlock_ip", 1043 &transaction_ops, S_IWUSR|S_IRUSR}, 1044 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1045 &transaction_ops, S_IWUSR|S_IRUSR}, 1046 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1047 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1048 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1049 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1050 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1051 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1052 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1053 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE) 1054 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO}, 1055 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */ 1056 #ifdef CONFIG_NFSD_V4 1057 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1058 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1059 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1060 #endif 1061 /* last one */ {""} 1062 }; 1063 struct net *net = data; 1064 int ret; 1065 1066 ret = simple_fill_super(sb, 0x6e667364, nfsd_files); 1067 if (ret) 1068 return ret; 1069 sb->s_fs_info = get_net(net); 1070 return 0; 1071 } 1072 1073 static struct dentry *nfsd_mount(struct file_system_type *fs_type, 1074 int flags, const char *dev_name, void *data) 1075 { 1076 return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super); 1077 } 1078 1079 static void nfsd_umount(struct super_block *sb) 1080 { 1081 struct net *net = sb->s_fs_info; 1082 1083 kill_litter_super(sb); 1084 put_net(net); 1085 } 1086 1087 static struct file_system_type nfsd_fs_type = { 1088 .owner = THIS_MODULE, 1089 .name = "nfsd", 1090 .mount = nfsd_mount, 1091 .kill_sb = nfsd_umount, 1092 }; 1093 MODULE_ALIAS_FS("nfsd"); 1094 1095 #ifdef CONFIG_PROC_FS 1096 static int create_proc_exports_entry(void) 1097 { 1098 struct proc_dir_entry *entry; 1099 1100 entry = proc_mkdir("fs/nfs", NULL); 1101 if (!entry) 1102 return -ENOMEM; 1103 entry = proc_create("exports", 0, entry, 1104 &exports_proc_operations); 1105 if (!entry) 1106 return -ENOMEM; 1107 return 0; 1108 } 1109 #else /* CONFIG_PROC_FS */ 1110 static int create_proc_exports_entry(void) 1111 { 1112 return 0; 1113 } 1114 #endif 1115 1116 int nfsd_net_id; 1117 1118 static __net_init int nfsd_init_net(struct net *net) 1119 { 1120 int retval; 1121 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1122 1123 retval = nfsd_export_init(net); 1124 if (retval) 1125 goto out_export_error; 1126 retval = nfsd_idmap_init(net); 1127 if (retval) 1128 goto out_idmap_error; 1129 nn->nfsd4_lease = 90; /* default lease time */ 1130 nn->nfsd4_grace = 90; 1131 return 0; 1132 1133 out_idmap_error: 1134 nfsd_export_shutdown(net); 1135 out_export_error: 1136 return retval; 1137 } 1138 1139 static __net_exit void nfsd_exit_net(struct net *net) 1140 { 1141 nfsd_idmap_shutdown(net); 1142 nfsd_export_shutdown(net); 1143 } 1144 1145 static struct pernet_operations nfsd_net_ops = { 1146 .init = nfsd_init_net, 1147 .exit = nfsd_exit_net, 1148 .id = &nfsd_net_id, 1149 .size = sizeof(struct nfsd_net), 1150 }; 1151 1152 static int __init init_nfsd(void) 1153 { 1154 int retval; 1155 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); 1156 1157 retval = register_cld_notifier(); 1158 if (retval) 1159 return retval; 1160 retval = register_pernet_subsys(&nfsd_net_ops); 1161 if (retval < 0) 1162 goto out_unregister_notifier; 1163 retval = nfsd4_init_slabs(); 1164 if (retval) 1165 goto out_unregister_pernet; 1166 nfs4_state_init(); 1167 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */ 1168 if (retval) 1169 goto out_free_slabs; 1170 nfsd_stat_init(); /* Statistics */ 1171 retval = nfsd_reply_cache_init(); 1172 if (retval) 1173 goto out_free_stat; 1174 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1175 retval = create_proc_exports_entry(); 1176 if (retval) 1177 goto out_free_lockd; 1178 retval = register_filesystem(&nfsd_fs_type); 1179 if (retval) 1180 goto out_free_all; 1181 return 0; 1182 out_free_all: 1183 remove_proc_entry("fs/nfs/exports", NULL); 1184 remove_proc_entry("fs/nfs", NULL); 1185 out_free_lockd: 1186 nfsd_lockd_shutdown(); 1187 nfsd_reply_cache_shutdown(); 1188 out_free_stat: 1189 nfsd_stat_shutdown(); 1190 nfsd_fault_inject_cleanup(); 1191 out_free_slabs: 1192 nfsd4_free_slabs(); 1193 out_unregister_pernet: 1194 unregister_pernet_subsys(&nfsd_net_ops); 1195 out_unregister_notifier: 1196 unregister_cld_notifier(); 1197 return retval; 1198 } 1199 1200 static void __exit exit_nfsd(void) 1201 { 1202 nfsd_reply_cache_shutdown(); 1203 remove_proc_entry("fs/nfs/exports", NULL); 1204 remove_proc_entry("fs/nfs", NULL); 1205 nfsd_stat_shutdown(); 1206 nfsd_lockd_shutdown(); 1207 nfsd4_free_slabs(); 1208 nfsd_fault_inject_cleanup(); 1209 unregister_filesystem(&nfsd_fs_type); 1210 unregister_pernet_subsys(&nfsd_net_ops); 1211 unregister_cld_notifier(); 1212 } 1213 1214 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1215 MODULE_LICENSE("GPL"); 1216 module_init(init_nfsd) 1217 module_exit(exit_nfsd) 1218