1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Syscall interface to knfsd. 4 * 5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 6 */ 7 8 #include <linux/slab.h> 9 #include <linux/namei.h> 10 #include <linux/ctype.h> 11 #include <linux/fs_context.h> 12 13 #include <linux/sunrpc/svcsock.h> 14 #include <linux/lockd/lockd.h> 15 #include <linux/sunrpc/addr.h> 16 #include <linux/sunrpc/gss_api.h> 17 #include <linux/sunrpc/rpc_pipe_fs.h> 18 #include <linux/module.h> 19 #include <linux/fsnotify.h> 20 21 #include "idmap.h" 22 #include "nfsd.h" 23 #include "cache.h" 24 #include "state.h" 25 #include "netns.h" 26 #include "pnfs.h" 27 #include "filecache.h" 28 #include "trace.h" 29 #include "netlink.h" 30 31 /* 32 * We have a single directory with several nodes in it. 33 */ 34 enum { 35 NFSD_Root = 1, 36 NFSD_List, 37 NFSD_Export_Stats, 38 NFSD_Export_features, 39 NFSD_Fh, 40 NFSD_FO_UnlockIP, 41 NFSD_FO_UnlockFS, 42 NFSD_Threads, 43 NFSD_Pool_Threads, 44 NFSD_Pool_Stats, 45 NFSD_Reply_Cache_Stats, 46 NFSD_Versions, 47 NFSD_Ports, 48 NFSD_MaxBlkSize, 49 NFSD_MaxConnections, 50 NFSD_Filecache, 51 /* 52 * The below MUST come last. Otherwise we leave a hole in nfsd_files[] 53 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops 54 */ 55 #ifdef CONFIG_NFSD_V4 56 NFSD_Leasetime, 57 NFSD_Gracetime, 58 NFSD_RecoveryDir, 59 NFSD_V4EndGrace, 60 #endif 61 NFSD_MaxReserved 62 }; 63 64 /* 65 * write() for these nodes. 66 */ 67 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 68 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 69 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 70 static ssize_t write_threads(struct file *file, char *buf, size_t size); 71 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 72 static ssize_t write_versions(struct file *file, char *buf, size_t size); 73 static ssize_t write_ports(struct file *file, char *buf, size_t size); 74 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 75 static ssize_t write_maxconn(struct file *file, char *buf, size_t size); 76 #ifdef CONFIG_NFSD_V4 77 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 78 static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 79 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 80 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size); 81 #endif 82 83 static ssize_t (*const write_op[])(struct file *, char *, size_t) = { 84 [NFSD_Fh] = write_filehandle, 85 [NFSD_FO_UnlockIP] = write_unlock_ip, 86 [NFSD_FO_UnlockFS] = write_unlock_fs, 87 [NFSD_Threads] = write_threads, 88 [NFSD_Pool_Threads] = write_pool_threads, 89 [NFSD_Versions] = write_versions, 90 [NFSD_Ports] = write_ports, 91 [NFSD_MaxBlkSize] = write_maxblksize, 92 [NFSD_MaxConnections] = write_maxconn, 93 #ifdef CONFIG_NFSD_V4 94 [NFSD_Leasetime] = write_leasetime, 95 [NFSD_Gracetime] = write_gracetime, 96 [NFSD_RecoveryDir] = write_recoverydir, 97 [NFSD_V4EndGrace] = write_v4_end_grace, 98 #endif 99 }; 100 101 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 102 { 103 ino_t ino = file_inode(file)->i_ino; 104 char *data; 105 ssize_t rv; 106 107 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 108 return -EINVAL; 109 110 data = simple_transaction_get(file, buf, size); 111 if (IS_ERR(data)) 112 return PTR_ERR(data); 113 114 rv = write_op[ino](file, data, size); 115 if (rv < 0) 116 return rv; 117 118 simple_transaction_set(file, rv); 119 return size; 120 } 121 122 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 123 { 124 if (! file->private_data) { 125 /* An attempt to read a transaction file without writing 126 * causes a 0-byte write so that the file can return 127 * state information 128 */ 129 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 130 if (rv < 0) 131 return rv; 132 } 133 return simple_transaction_read(file, buf, size, pos); 134 } 135 136 static const struct file_operations transaction_ops = { 137 .write = nfsctl_transaction_write, 138 .read = nfsctl_transaction_read, 139 .release = simple_transaction_release, 140 .llseek = default_llseek, 141 }; 142 143 static int exports_net_open(struct net *net, struct file *file) 144 { 145 int err; 146 struct seq_file *seq; 147 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 148 149 err = seq_open(file, &nfs_exports_op); 150 if (err) 151 return err; 152 153 seq = file->private_data; 154 seq->private = nn->svc_export_cache; 155 return 0; 156 } 157 158 static int exports_nfsd_open(struct inode *inode, struct file *file) 159 { 160 return exports_net_open(inode->i_sb->s_fs_info, file); 161 } 162 163 static const struct file_operations exports_nfsd_operations = { 164 .open = exports_nfsd_open, 165 .read = seq_read, 166 .llseek = seq_lseek, 167 .release = seq_release, 168 }; 169 170 static int export_features_show(struct seq_file *m, void *v) 171 { 172 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); 173 return 0; 174 } 175 176 DEFINE_SHOW_ATTRIBUTE(export_features); 177 178 static const struct file_operations pool_stats_operations = { 179 .open = nfsd_pool_stats_open, 180 .read = seq_read, 181 .llseek = seq_lseek, 182 .release = nfsd_pool_stats_release, 183 }; 184 185 DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats); 186 187 DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats); 188 189 /*----------------------------------------------------------------------------*/ 190 /* 191 * payload - write methods 192 */ 193 194 static inline struct net *netns(struct file *file) 195 { 196 return file_inode(file)->i_sb->s_fs_info; 197 } 198 199 /* 200 * write_unlock_ip - Release all locks used by a client 201 * 202 * Experimental. 203 * 204 * Input: 205 * buf: '\n'-terminated C string containing a 206 * presentation format IP address 207 * size: length of C string in @buf 208 * Output: 209 * On success: returns zero if all specified locks were released; 210 * returns one if one or more locks were not released 211 * On error: return code is negative errno value 212 */ 213 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) 214 { 215 struct sockaddr_storage address; 216 struct sockaddr *sap = (struct sockaddr *)&address; 217 size_t salen = sizeof(address); 218 char *fo_path; 219 struct net *net = netns(file); 220 221 /* sanity check */ 222 if (size == 0) 223 return -EINVAL; 224 225 if (buf[size-1] != '\n') 226 return -EINVAL; 227 228 fo_path = buf; 229 if (qword_get(&buf, fo_path, size) < 0) 230 return -EINVAL; 231 232 if (rpc_pton(net, fo_path, size, sap, salen) == 0) 233 return -EINVAL; 234 235 trace_nfsd_ctl_unlock_ip(net, buf); 236 return nlmsvc_unlock_all_by_ip(sap); 237 } 238 239 /* 240 * write_unlock_fs - Release all locks on a local file system 241 * 242 * Experimental. 243 * 244 * Input: 245 * buf: '\n'-terminated C string containing the 246 * absolute pathname of a local file system 247 * size: length of C string in @buf 248 * Output: 249 * On success: returns zero if all specified locks were released; 250 * returns one if one or more locks were not released 251 * On error: return code is negative errno value 252 */ 253 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) 254 { 255 struct path path; 256 char *fo_path; 257 int error; 258 259 /* sanity check */ 260 if (size == 0) 261 return -EINVAL; 262 263 if (buf[size-1] != '\n') 264 return -EINVAL; 265 266 fo_path = buf; 267 if (qword_get(&buf, fo_path, size) < 0) 268 return -EINVAL; 269 trace_nfsd_ctl_unlock_fs(netns(file), fo_path); 270 error = kern_path(fo_path, 0, &path); 271 if (error) 272 return error; 273 274 /* 275 * XXX: Needs better sanity checking. Otherwise we could end up 276 * releasing locks on the wrong file system. 277 * 278 * For example: 279 * 1. Does the path refer to a directory? 280 * 2. Is that directory a mount point, or 281 * 3. Is that directory the root of an exported file system? 282 */ 283 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb); 284 285 path_put(&path); 286 return error; 287 } 288 289 /* 290 * write_filehandle - Get a variable-length NFS file handle by path 291 * 292 * On input, the buffer contains a '\n'-terminated C string comprised of 293 * three alphanumeric words separated by whitespace. The string may 294 * contain escape sequences. 295 * 296 * Input: 297 * buf: 298 * domain: client domain name 299 * path: export pathname 300 * maxsize: numeric maximum size of 301 * @buf 302 * size: length of C string in @buf 303 * Output: 304 * On success: passed-in buffer filled with '\n'-terminated C 305 * string containing a ASCII hex text version 306 * of the NFS file handle; 307 * return code is the size in bytes of the string 308 * On error: return code is negative errno value 309 */ 310 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 311 { 312 char *dname, *path; 313 int maxsize; 314 char *mesg = buf; 315 int len; 316 struct auth_domain *dom; 317 struct knfsd_fh fh; 318 319 if (size == 0) 320 return -EINVAL; 321 322 if (buf[size-1] != '\n') 323 return -EINVAL; 324 buf[size-1] = 0; 325 326 dname = mesg; 327 len = qword_get(&mesg, dname, size); 328 if (len <= 0) 329 return -EINVAL; 330 331 path = dname+len+1; 332 len = qword_get(&mesg, path, size); 333 if (len <= 0) 334 return -EINVAL; 335 336 len = get_int(&mesg, &maxsize); 337 if (len) 338 return len; 339 340 if (maxsize < NFS_FHSIZE) 341 return -EINVAL; 342 maxsize = min(maxsize, NFS3_FHSIZE); 343 344 if (qword_get(&mesg, mesg, size) > 0) 345 return -EINVAL; 346 347 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize); 348 349 /* we have all the words, they are in buf.. */ 350 dom = unix_domain_find(dname); 351 if (!dom) 352 return -ENOMEM; 353 354 len = exp_rootfh(netns(file), dom, path, &fh, maxsize); 355 auth_domain_put(dom); 356 if (len) 357 return len; 358 359 mesg = buf; 360 len = SIMPLE_TRANSACTION_LIMIT; 361 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size); 362 mesg[-1] = '\n'; 363 return mesg - buf; 364 } 365 366 /* 367 * write_threads - Start NFSD, or report the current number of running threads 368 * 369 * Input: 370 * buf: ignored 371 * size: zero 372 * Output: 373 * On success: passed-in buffer filled with '\n'-terminated C 374 * string numeric value representing the number of 375 * running NFSD threads; 376 * return code is the size in bytes of the string 377 * On error: return code is zero 378 * 379 * OR 380 * 381 * Input: 382 * buf: C string containing an unsigned 383 * integer value representing the 384 * number of NFSD threads to start 385 * size: non-zero length of C string in @buf 386 * Output: 387 * On success: NFS service is started; 388 * passed-in buffer filled with '\n'-terminated C 389 * string numeric value representing the number of 390 * running NFSD threads; 391 * return code is the size in bytes of the string 392 * On error: return code is zero or a negative errno value 393 */ 394 static ssize_t write_threads(struct file *file, char *buf, size_t size) 395 { 396 char *mesg = buf; 397 int rv; 398 struct net *net = netns(file); 399 400 if (size > 0) { 401 int newthreads; 402 rv = get_int(&mesg, &newthreads); 403 if (rv) 404 return rv; 405 if (newthreads < 0) 406 return -EINVAL; 407 trace_nfsd_ctl_threads(net, newthreads); 408 rv = nfsd_svc(newthreads, net, file->f_cred); 409 if (rv < 0) 410 return rv; 411 } else 412 rv = nfsd_nrthreads(net); 413 414 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 415 } 416 417 /* 418 * write_pool_threads - Set or report the current number of threads per pool 419 * 420 * Input: 421 * buf: ignored 422 * size: zero 423 * 424 * OR 425 * 426 * Input: 427 * buf: C string containing whitespace- 428 * separated unsigned integer values 429 * representing the number of NFSD 430 * threads to start in each pool 431 * size: non-zero length of C string in @buf 432 * Output: 433 * On success: passed-in buffer filled with '\n'-terminated C 434 * string containing integer values representing the 435 * number of NFSD threads in each pool; 436 * return code is the size in bytes of the string 437 * On error: return code is zero or a negative errno value 438 */ 439 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 440 { 441 /* if size > 0, look for an array of number of threads per node 442 * and apply them then write out number of threads per node as reply 443 */ 444 char *mesg = buf; 445 int i; 446 int rv; 447 int len; 448 int npools; 449 int *nthreads; 450 struct net *net = netns(file); 451 452 mutex_lock(&nfsd_mutex); 453 npools = nfsd_nrpools(net); 454 if (npools == 0) { 455 /* 456 * NFS is shut down. The admin can start it by 457 * writing to the threads file but NOT the pool_threads 458 * file, sorry. Report zero threads. 459 */ 460 mutex_unlock(&nfsd_mutex); 461 strcpy(buf, "0\n"); 462 return strlen(buf); 463 } 464 465 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); 466 rv = -ENOMEM; 467 if (nthreads == NULL) 468 goto out_free; 469 470 if (size > 0) { 471 for (i = 0; i < npools; i++) { 472 rv = get_int(&mesg, &nthreads[i]); 473 if (rv == -ENOENT) 474 break; /* fewer numbers than pools */ 475 if (rv) 476 goto out_free; /* syntax error */ 477 rv = -EINVAL; 478 if (nthreads[i] < 0) 479 goto out_free; 480 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]); 481 } 482 rv = nfsd_set_nrthreads(i, nthreads, net); 483 if (rv) 484 goto out_free; 485 } 486 487 rv = nfsd_get_nrthreads(npools, nthreads, net); 488 if (rv) 489 goto out_free; 490 491 mesg = buf; 492 size = SIMPLE_TRANSACTION_LIMIT; 493 for (i = 0; i < npools && size > 0; i++) { 494 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 495 len = strlen(mesg); 496 size -= len; 497 mesg += len; 498 } 499 rv = mesg - buf; 500 out_free: 501 kfree(nthreads); 502 mutex_unlock(&nfsd_mutex); 503 return rv; 504 } 505 506 static ssize_t 507 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining, 508 const char *sep, unsigned vers, int minor) 509 { 510 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u"; 511 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST); 512 513 if (vers == 4 && minor >= 0 && 514 !nfsd_minorversion(nn, minor, NFSD_TEST)) 515 supported = false; 516 if (minor == 0 && supported) 517 /* 518 * special case for backward compatability. 519 * +4.0 is never reported, it is implied by 520 * +4, unless -4.0 is present. 521 */ 522 return 0; 523 return snprintf(buf, remaining, format, sep, 524 supported ? '+' : '-', vers, minor); 525 } 526 527 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 528 { 529 char *mesg = buf; 530 char *vers, *minorp, sign; 531 int len, num, remaining; 532 ssize_t tlen = 0; 533 char *sep; 534 struct nfsd_net *nn = net_generic(netns(file), 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 trace_nfsd_ctl_version(netns(file), buf); 547 548 vers = mesg; 549 len = qword_get(&mesg, vers, size); 550 if (len <= 0) return -EINVAL; 551 do { 552 enum vers_op cmd; 553 unsigned minor; 554 sign = *vers; 555 if (sign == '+' || sign == '-') 556 num = simple_strtol((vers+1), &minorp, 0); 557 else 558 num = simple_strtol(vers, &minorp, 0); 559 if (*minorp == '.') { 560 if (num != 4) 561 return -EINVAL; 562 if (kstrtouint(minorp+1, 0, &minor) < 0) 563 return -EINVAL; 564 } 565 566 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET; 567 switch(num) { 568 #ifdef CONFIG_NFSD_V2 569 case 2: 570 #endif 571 case 3: 572 nfsd_vers(nn, num, cmd); 573 break; 574 case 4: 575 if (*minorp == '.') { 576 if (nfsd_minorversion(nn, minor, cmd) < 0) 577 return -EINVAL; 578 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) { 579 /* 580 * Either we have +4 and no minors are enabled, 581 * or we have -4 and at least one minor is enabled. 582 * In either case, propagate 'cmd' to all minors. 583 */ 584 minor = 0; 585 while (nfsd_minorversion(nn, minor, cmd) >= 0) 586 minor++; 587 } 588 break; 589 default: 590 /* Ignore requests to disable non-existent versions */ 591 if (cmd == NFSD_SET) 592 return -EINVAL; 593 } 594 vers += len + 1; 595 } while ((len = qword_get(&mesg, vers, size)) > 0); 596 /* If all get turned off, turn them back on, as 597 * having no versions is BAD 598 */ 599 nfsd_reset_versions(nn); 600 } 601 602 /* Now write current state into reply buffer */ 603 sep = ""; 604 remaining = SIMPLE_TRANSACTION_LIMIT; 605 for (num=2 ; num <= 4 ; num++) { 606 int minor; 607 if (!nfsd_vers(nn, num, NFSD_AVAIL)) 608 continue; 609 610 minor = -1; 611 do { 612 len = nfsd_print_version_support(nn, buf, remaining, 613 sep, num, minor); 614 if (len >= remaining) 615 goto out; 616 remaining -= len; 617 buf += len; 618 tlen += len; 619 minor++; 620 if (len) 621 sep = " "; 622 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION); 623 } 624 out: 625 len = snprintf(buf, remaining, "\n"); 626 if (len >= remaining) 627 return -EINVAL; 628 return tlen + len; 629 } 630 631 /* 632 * write_versions - Set or report the available NFS protocol versions 633 * 634 * Input: 635 * buf: ignored 636 * size: zero 637 * Output: 638 * On success: passed-in buffer filled with '\n'-terminated C 639 * string containing positive or negative integer 640 * values representing the current status of each 641 * protocol version; 642 * return code is the size in bytes of the string 643 * On error: return code is zero or a negative errno value 644 * 645 * OR 646 * 647 * Input: 648 * buf: C string containing whitespace- 649 * separated positive or negative 650 * integer values representing NFS 651 * protocol versions to enable ("+n") 652 * or disable ("-n") 653 * size: non-zero length of C string in @buf 654 * Output: 655 * On success: status of zero or more protocol versions has 656 * been updated; passed-in buffer filled with 657 * '\n'-terminated C string containing positive 658 * or negative integer values representing the 659 * current status of each protocol version; 660 * return code is the size in bytes of the string 661 * On error: return code is zero or a negative errno value 662 */ 663 static ssize_t write_versions(struct file *file, char *buf, size_t size) 664 { 665 ssize_t rv; 666 667 mutex_lock(&nfsd_mutex); 668 rv = __write_versions(file, buf, size); 669 mutex_unlock(&nfsd_mutex); 670 return rv; 671 } 672 673 /* 674 * Zero-length write. Return a list of NFSD's current listener 675 * transports. 676 */ 677 static ssize_t __write_ports_names(char *buf, struct net *net) 678 { 679 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 680 681 if (nn->nfsd_serv == NULL) 682 return 0; 683 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 684 } 685 686 /* 687 * A single 'fd' number was written, in which case it must be for 688 * a socket of a supported family/protocol, and we use it as an 689 * nfsd listener. 690 */ 691 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred) 692 { 693 char *mesg = buf; 694 int fd, err; 695 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 696 697 err = get_int(&mesg, &fd); 698 if (err != 0 || fd < 0) 699 return -EINVAL; 700 trace_nfsd_ctl_ports_addfd(net, fd); 701 702 err = nfsd_create_serv(net); 703 if (err != 0) 704 return err; 705 706 err = svc_addsock(nn->nfsd_serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred); 707 708 if (err >= 0 && 709 !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 710 svc_get(nn->nfsd_serv); 711 712 nfsd_put(net); 713 return err; 714 } 715 716 /* 717 * A transport listener is added by writing its transport name and 718 * a port number. 719 */ 720 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred) 721 { 722 char transport[16]; 723 struct svc_xprt *xprt; 724 int port, err; 725 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 726 727 if (sscanf(buf, "%15s %5u", transport, &port) != 2) 728 return -EINVAL; 729 730 if (port < 1 || port > USHRT_MAX) 731 return -EINVAL; 732 trace_nfsd_ctl_ports_addxprt(net, transport, port); 733 734 err = nfsd_create_serv(net); 735 if (err != 0) 736 return err; 737 738 err = svc_xprt_create(nn->nfsd_serv, transport, net, 739 PF_INET, port, SVC_SOCK_ANONYMOUS, cred); 740 if (err < 0) 741 goto out_err; 742 743 err = svc_xprt_create(nn->nfsd_serv, transport, net, 744 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred); 745 if (err < 0 && err != -EAFNOSUPPORT) 746 goto out_close; 747 748 if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 749 svc_get(nn->nfsd_serv); 750 751 nfsd_put(net); 752 return 0; 753 out_close: 754 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port); 755 if (xprt != NULL) { 756 svc_xprt_close(xprt); 757 svc_xprt_put(xprt); 758 } 759 out_err: 760 nfsd_put(net); 761 return err; 762 } 763 764 static ssize_t __write_ports(struct file *file, char *buf, size_t size, 765 struct net *net) 766 { 767 if (size == 0) 768 return __write_ports_names(buf, net); 769 770 if (isdigit(buf[0])) 771 return __write_ports_addfd(buf, net, file->f_cred); 772 773 if (isalpha(buf[0])) 774 return __write_ports_addxprt(buf, net, file->f_cred); 775 776 return -EINVAL; 777 } 778 779 /* 780 * write_ports - Pass a socket file descriptor or transport name to listen on 781 * 782 * Input: 783 * buf: ignored 784 * size: zero 785 * Output: 786 * On success: passed-in buffer filled with a '\n'-terminated C 787 * string containing a whitespace-separated list of 788 * named NFSD listeners; 789 * return code is the size in bytes of the string 790 * On error: return code is zero or a negative errno value 791 * 792 * OR 793 * 794 * Input: 795 * buf: C string containing an unsigned 796 * integer value representing a bound 797 * but unconnected socket that is to be 798 * used as an NFSD listener; listen(3) 799 * must be called for a SOCK_STREAM 800 * socket, otherwise it is ignored 801 * size: non-zero length of C string in @buf 802 * Output: 803 * On success: NFS service is started; 804 * passed-in buffer filled with a '\n'-terminated C 805 * string containing a unique alphanumeric name of 806 * the listener; 807 * return code is the size in bytes of the string 808 * On error: return code is a negative errno value 809 * 810 * OR 811 * 812 * Input: 813 * buf: C string containing a transport 814 * name and an unsigned integer value 815 * representing the port to listen on, 816 * separated by whitespace 817 * size: non-zero length of C string in @buf 818 * Output: 819 * On success: returns zero; NFS service is started 820 * On error: return code is a negative errno value 821 */ 822 static ssize_t write_ports(struct file *file, char *buf, size_t size) 823 { 824 ssize_t rv; 825 826 mutex_lock(&nfsd_mutex); 827 rv = __write_ports(file, buf, size, netns(file)); 828 mutex_unlock(&nfsd_mutex); 829 return rv; 830 } 831 832 833 int nfsd_max_blksize; 834 835 /* 836 * write_maxblksize - Set or report the current NFS blksize 837 * 838 * Input: 839 * buf: ignored 840 * size: zero 841 * 842 * OR 843 * 844 * Input: 845 * buf: C string containing an unsigned 846 * integer value representing the new 847 * NFS blksize 848 * size: non-zero length of C string in @buf 849 * Output: 850 * On success: passed-in buffer filled with '\n'-terminated C string 851 * containing numeric value of the current NFS blksize 852 * setting; 853 * return code is the size in bytes of the string 854 * On error: return code is zero or a negative errno value 855 */ 856 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 857 { 858 char *mesg = buf; 859 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 860 861 if (size > 0) { 862 int bsize; 863 int rv = get_int(&mesg, &bsize); 864 if (rv) 865 return rv; 866 trace_nfsd_ctl_maxblksize(netns(file), bsize); 867 868 /* force bsize into allowed range and 869 * required alignment. 870 */ 871 bsize = max_t(int, bsize, 1024); 872 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE); 873 bsize &= ~(1024-1); 874 mutex_lock(&nfsd_mutex); 875 if (nn->nfsd_serv) { 876 mutex_unlock(&nfsd_mutex); 877 return -EBUSY; 878 } 879 nfsd_max_blksize = bsize; 880 mutex_unlock(&nfsd_mutex); 881 } 882 883 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 884 nfsd_max_blksize); 885 } 886 887 /* 888 * write_maxconn - Set or report the current max number of connections 889 * 890 * Input: 891 * buf: ignored 892 * size: zero 893 * OR 894 * 895 * Input: 896 * buf: C string containing an unsigned 897 * integer value representing the new 898 * number of max connections 899 * size: non-zero length of C string in @buf 900 * Output: 901 * On success: passed-in buffer filled with '\n'-terminated C string 902 * containing numeric value of max_connections setting 903 * for this net namespace; 904 * return code is the size in bytes of the string 905 * On error: return code is zero or a negative errno value 906 */ 907 static ssize_t write_maxconn(struct file *file, char *buf, size_t size) 908 { 909 char *mesg = buf; 910 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 911 unsigned int maxconn = nn->max_connections; 912 913 if (size > 0) { 914 int rv = get_uint(&mesg, &maxconn); 915 916 if (rv) 917 return rv; 918 trace_nfsd_ctl_maxconn(netns(file), maxconn); 919 nn->max_connections = maxconn; 920 } 921 922 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn); 923 } 924 925 #ifdef CONFIG_NFSD_V4 926 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, 927 time64_t *time, struct nfsd_net *nn) 928 { 929 struct dentry *dentry = file_dentry(file); 930 char *mesg = buf; 931 int rv, i; 932 933 if (size > 0) { 934 if (nn->nfsd_serv) 935 return -EBUSY; 936 rv = get_int(&mesg, &i); 937 if (rv) 938 return rv; 939 trace_nfsd_ctl_time(netns(file), dentry->d_name.name, 940 dentry->d_name.len, i); 941 942 /* 943 * Some sanity checking. We don't have a reason for 944 * these particular numbers, but problems with the 945 * extremes are: 946 * - Too short: the briefest network outage may 947 * cause clients to lose all their locks. Also, 948 * the frequent polling may be wasteful. 949 * - Too long: do you really want reboot recovery 950 * to take more than an hour? Or to make other 951 * clients wait an hour before being able to 952 * revoke a dead client's locks? 953 */ 954 if (i < 10 || i > 3600) 955 return -EINVAL; 956 *time = i; 957 } 958 959 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time); 960 } 961 962 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, 963 time64_t *time, struct nfsd_net *nn) 964 { 965 ssize_t rv; 966 967 mutex_lock(&nfsd_mutex); 968 rv = __nfsd4_write_time(file, buf, size, time, nn); 969 mutex_unlock(&nfsd_mutex); 970 return rv; 971 } 972 973 /* 974 * write_leasetime - Set or report the current NFSv4 lease time 975 * 976 * Input: 977 * buf: ignored 978 * size: zero 979 * 980 * OR 981 * 982 * Input: 983 * buf: C string containing an unsigned 984 * integer value representing the new 985 * NFSv4 lease expiry time 986 * size: non-zero length of C string in @buf 987 * Output: 988 * On success: passed-in buffer filled with '\n'-terminated C 989 * string containing unsigned integer value of the 990 * current lease expiry time; 991 * return code is the size in bytes of the string 992 * On error: return code is zero or a negative errno value 993 */ 994 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 995 { 996 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 997 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); 998 } 999 1000 /* 1001 * write_gracetime - Set or report current NFSv4 grace period time 1002 * 1003 * As above, but sets the time of the NFSv4 grace period. 1004 * 1005 * Note this should never be set to less than the *previous* 1006 * lease-period time, but we don't try to enforce this. (In the common 1007 * case (a new boot), we don't know what the previous lease time was 1008 * anyway.) 1009 */ 1010 static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1011 { 1012 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1013 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); 1014 } 1015 1016 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, 1017 struct nfsd_net *nn) 1018 { 1019 char *mesg = buf; 1020 char *recdir; 1021 int len, status; 1022 1023 if (size > 0) { 1024 if (nn->nfsd_serv) 1025 return -EBUSY; 1026 if (size > PATH_MAX || buf[size-1] != '\n') 1027 return -EINVAL; 1028 buf[size-1] = 0; 1029 1030 recdir = mesg; 1031 len = qword_get(&mesg, recdir, size); 1032 if (len <= 0) 1033 return -EINVAL; 1034 trace_nfsd_ctl_recoverydir(netns(file), recdir); 1035 1036 status = nfs4_reset_recoverydir(recdir); 1037 if (status) 1038 return status; 1039 } 1040 1041 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1042 nfs4_recoverydir()); 1043 } 1044 1045 /* 1046 * write_recoverydir - Set or report the pathname of the recovery directory 1047 * 1048 * Input: 1049 * buf: ignored 1050 * size: zero 1051 * 1052 * OR 1053 * 1054 * Input: 1055 * buf: C string containing the pathname 1056 * of the directory on a local file 1057 * system containing permanent NFSv4 1058 * recovery data 1059 * size: non-zero length of C string in @buf 1060 * Output: 1061 * On success: passed-in buffer filled with '\n'-terminated C string 1062 * containing the current recovery pathname setting; 1063 * return code is the size in bytes of the string 1064 * On error: return code is zero or a negative errno value 1065 */ 1066 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1067 { 1068 ssize_t rv; 1069 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1070 1071 mutex_lock(&nfsd_mutex); 1072 rv = __write_recoverydir(file, buf, size, nn); 1073 mutex_unlock(&nfsd_mutex); 1074 return rv; 1075 } 1076 1077 /* 1078 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager 1079 * 1080 * Input: 1081 * buf: ignored 1082 * size: zero 1083 * OR 1084 * 1085 * Input: 1086 * buf: any value 1087 * size: non-zero length of C string in @buf 1088 * Output: 1089 * passed-in buffer filled with "Y" or "N" with a newline 1090 * and NULL-terminated C string. This indicates whether 1091 * the grace period has ended in the current net 1092 * namespace. Return code is the size in bytes of the 1093 * string. Writing a string that starts with 'Y', 'y', or 1094 * '1' to the file will end the grace period for nfsd's v4 1095 * lock manager. 1096 */ 1097 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) 1098 { 1099 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1100 1101 if (size > 0) { 1102 switch(buf[0]) { 1103 case 'Y': 1104 case 'y': 1105 case '1': 1106 if (!nn->nfsd_serv) 1107 return -EBUSY; 1108 trace_nfsd_end_grace(netns(file)); 1109 nfsd4_end_grace(nn); 1110 break; 1111 default: 1112 return -EINVAL; 1113 } 1114 } 1115 1116 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n", 1117 nn->grace_ended ? 'Y' : 'N'); 1118 } 1119 1120 #endif 1121 1122 /*----------------------------------------------------------------------------*/ 1123 /* 1124 * populating the filesystem. 1125 */ 1126 1127 /* Basically copying rpc_get_inode. */ 1128 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) 1129 { 1130 struct inode *inode = new_inode(sb); 1131 if (!inode) 1132 return NULL; 1133 /* Following advice from simple_fill_super documentation: */ 1134 inode->i_ino = iunique(sb, NFSD_MaxReserved); 1135 inode->i_mode = mode; 1136 simple_inode_init_ts(inode); 1137 switch (mode & S_IFMT) { 1138 case S_IFDIR: 1139 inode->i_fop = &simple_dir_operations; 1140 inode->i_op = &simple_dir_inode_operations; 1141 inc_nlink(inode); 1142 break; 1143 case S_IFLNK: 1144 inode->i_op = &simple_symlink_inode_operations; 1145 break; 1146 default: 1147 break; 1148 } 1149 return inode; 1150 } 1151 1152 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl) 1153 { 1154 struct inode *inode; 1155 1156 inode = nfsd_get_inode(dir->i_sb, mode); 1157 if (!inode) 1158 return -ENOMEM; 1159 if (ncl) { 1160 inode->i_private = ncl; 1161 kref_get(&ncl->cl_ref); 1162 } 1163 d_add(dentry, inode); 1164 inc_nlink(dir); 1165 fsnotify_mkdir(dir, dentry); 1166 return 0; 1167 } 1168 1169 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name) 1170 { 1171 struct inode *dir = parent->d_inode; 1172 struct dentry *dentry; 1173 int ret = -ENOMEM; 1174 1175 inode_lock(dir); 1176 dentry = d_alloc_name(parent, name); 1177 if (!dentry) 1178 goto out_err; 1179 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl); 1180 if (ret) 1181 goto out_err; 1182 out: 1183 inode_unlock(dir); 1184 return dentry; 1185 out_err: 1186 dput(dentry); 1187 dentry = ERR_PTR(ret); 1188 goto out; 1189 } 1190 1191 #if IS_ENABLED(CONFIG_SUNRPC_GSS) 1192 static int __nfsd_symlink(struct inode *dir, struct dentry *dentry, 1193 umode_t mode, const char *content) 1194 { 1195 struct inode *inode; 1196 1197 inode = nfsd_get_inode(dir->i_sb, mode); 1198 if (!inode) 1199 return -ENOMEM; 1200 1201 inode->i_link = (char *)content; 1202 inode->i_size = strlen(content); 1203 1204 d_add(dentry, inode); 1205 inc_nlink(dir); 1206 fsnotify_create(dir, dentry); 1207 return 0; 1208 } 1209 1210 /* 1211 * @content is assumed to be a NUL-terminated string that lives 1212 * longer than the symlink itself. 1213 */ 1214 static void _nfsd_symlink(struct dentry *parent, const char *name, 1215 const char *content) 1216 { 1217 struct inode *dir = parent->d_inode; 1218 struct dentry *dentry; 1219 int ret; 1220 1221 inode_lock(dir); 1222 dentry = d_alloc_name(parent, name); 1223 if (!dentry) 1224 goto out; 1225 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content); 1226 if (ret) 1227 dput(dentry); 1228 out: 1229 inode_unlock(dir); 1230 } 1231 #else 1232 static inline void _nfsd_symlink(struct dentry *parent, const char *name, 1233 const char *content) 1234 { 1235 } 1236 1237 #endif 1238 1239 static void clear_ncl(struct inode *inode) 1240 { 1241 struct nfsdfs_client *ncl = inode->i_private; 1242 1243 inode->i_private = NULL; 1244 kref_put(&ncl->cl_ref, ncl->cl_release); 1245 } 1246 1247 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode) 1248 { 1249 struct nfsdfs_client *nc = inode->i_private; 1250 1251 if (nc) 1252 kref_get(&nc->cl_ref); 1253 return nc; 1254 } 1255 1256 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode) 1257 { 1258 struct nfsdfs_client *nc; 1259 1260 inode_lock_shared(inode); 1261 nc = __get_nfsdfs_client(inode); 1262 inode_unlock_shared(inode); 1263 return nc; 1264 } 1265 /* from __rpc_unlink */ 1266 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry) 1267 { 1268 int ret; 1269 1270 clear_ncl(d_inode(dentry)); 1271 dget(dentry); 1272 ret = simple_unlink(dir, dentry); 1273 d_drop(dentry); 1274 fsnotify_unlink(dir, dentry); 1275 dput(dentry); 1276 WARN_ON_ONCE(ret); 1277 } 1278 1279 static void nfsdfs_remove_files(struct dentry *root) 1280 { 1281 struct dentry *dentry, *tmp; 1282 1283 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) { 1284 if (!simple_positive(dentry)) { 1285 WARN_ON_ONCE(1); /* I think this can't happen? */ 1286 continue; 1287 } 1288 nfsdfs_remove_file(d_inode(root), dentry); 1289 } 1290 } 1291 1292 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share 1293 * code instead. */ 1294 static int nfsdfs_create_files(struct dentry *root, 1295 const struct tree_descr *files, 1296 struct dentry **fdentries) 1297 { 1298 struct inode *dir = d_inode(root); 1299 struct inode *inode; 1300 struct dentry *dentry; 1301 int i; 1302 1303 inode_lock(dir); 1304 for (i = 0; files->name && files->name[0]; i++, files++) { 1305 dentry = d_alloc_name(root, files->name); 1306 if (!dentry) 1307 goto out; 1308 inode = nfsd_get_inode(d_inode(root)->i_sb, 1309 S_IFREG | files->mode); 1310 if (!inode) { 1311 dput(dentry); 1312 goto out; 1313 } 1314 inode->i_fop = files->ops; 1315 inode->i_private = __get_nfsdfs_client(dir); 1316 d_add(dentry, inode); 1317 fsnotify_create(dir, dentry); 1318 if (fdentries) 1319 fdentries[i] = dentry; 1320 } 1321 inode_unlock(dir); 1322 return 0; 1323 out: 1324 nfsdfs_remove_files(root); 1325 inode_unlock(dir); 1326 return -ENOMEM; 1327 } 1328 1329 /* on success, returns positive number unique to that client. */ 1330 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, 1331 struct nfsdfs_client *ncl, u32 id, 1332 const struct tree_descr *files, 1333 struct dentry **fdentries) 1334 { 1335 struct dentry *dentry; 1336 char name[11]; 1337 int ret; 1338 1339 sprintf(name, "%u", id); 1340 1341 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name); 1342 if (IS_ERR(dentry)) /* XXX: tossing errors? */ 1343 return NULL; 1344 ret = nfsdfs_create_files(dentry, files, fdentries); 1345 if (ret) { 1346 nfsd_client_rmdir(dentry); 1347 return NULL; 1348 } 1349 return dentry; 1350 } 1351 1352 /* Taken from __rpc_rmdir: */ 1353 void nfsd_client_rmdir(struct dentry *dentry) 1354 { 1355 struct inode *dir = d_inode(dentry->d_parent); 1356 struct inode *inode = d_inode(dentry); 1357 int ret; 1358 1359 inode_lock(dir); 1360 nfsdfs_remove_files(dentry); 1361 clear_ncl(inode); 1362 dget(dentry); 1363 ret = simple_rmdir(dir, dentry); 1364 WARN_ON_ONCE(ret); 1365 d_drop(dentry); 1366 fsnotify_rmdir(dir, dentry); 1367 dput(dentry); 1368 inode_unlock(dir); 1369 } 1370 1371 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) 1372 { 1373 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 1374 nfsd_net_id); 1375 struct dentry *dentry; 1376 int ret; 1377 1378 static const struct tree_descr nfsd_files[] = { 1379 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, 1380 /* Per-export io stats use same ops as exports file */ 1381 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO}, 1382 [NFSD_Export_features] = {"export_features", 1383 &export_features_fops, S_IRUGO}, 1384 [NFSD_FO_UnlockIP] = {"unlock_ip", 1385 &transaction_ops, S_IWUSR|S_IRUSR}, 1386 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1387 &transaction_ops, S_IWUSR|S_IRUSR}, 1388 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1389 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1390 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1391 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1392 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", 1393 &nfsd_reply_cache_stats_fops, S_IRUGO}, 1394 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1395 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1396 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1397 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO}, 1398 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO}, 1399 #ifdef CONFIG_NFSD_V4 1400 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1401 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1402 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1403 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, 1404 #endif 1405 /* last one */ {""} 1406 }; 1407 1408 ret = simple_fill_super(sb, 0x6e667364, nfsd_files); 1409 if (ret) 1410 return ret; 1411 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes", 1412 "/proc/net/rpc/gss_krb5_enctypes"); 1413 dentry = nfsd_mkdir(sb->s_root, NULL, "clients"); 1414 if (IS_ERR(dentry)) 1415 return PTR_ERR(dentry); 1416 nn->nfsd_client_dir = dentry; 1417 return 0; 1418 } 1419 1420 static int nfsd_fs_get_tree(struct fs_context *fc) 1421 { 1422 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns)); 1423 } 1424 1425 static void nfsd_fs_free_fc(struct fs_context *fc) 1426 { 1427 if (fc->s_fs_info) 1428 put_net(fc->s_fs_info); 1429 } 1430 1431 static const struct fs_context_operations nfsd_fs_context_ops = { 1432 .free = nfsd_fs_free_fc, 1433 .get_tree = nfsd_fs_get_tree, 1434 }; 1435 1436 static int nfsd_init_fs_context(struct fs_context *fc) 1437 { 1438 put_user_ns(fc->user_ns); 1439 fc->user_ns = get_user_ns(fc->net_ns->user_ns); 1440 fc->ops = &nfsd_fs_context_ops; 1441 return 0; 1442 } 1443 1444 static void nfsd_umount(struct super_block *sb) 1445 { 1446 struct net *net = sb->s_fs_info; 1447 1448 nfsd_shutdown_threads(net); 1449 1450 kill_litter_super(sb); 1451 put_net(net); 1452 } 1453 1454 static struct file_system_type nfsd_fs_type = { 1455 .owner = THIS_MODULE, 1456 .name = "nfsd", 1457 .init_fs_context = nfsd_init_fs_context, 1458 .kill_sb = nfsd_umount, 1459 }; 1460 MODULE_ALIAS_FS("nfsd"); 1461 1462 #ifdef CONFIG_PROC_FS 1463 1464 static int exports_proc_open(struct inode *inode, struct file *file) 1465 { 1466 return exports_net_open(current->nsproxy->net_ns, file); 1467 } 1468 1469 static const struct proc_ops exports_proc_ops = { 1470 .proc_open = exports_proc_open, 1471 .proc_read = seq_read, 1472 .proc_lseek = seq_lseek, 1473 .proc_release = seq_release, 1474 }; 1475 1476 static int create_proc_exports_entry(void) 1477 { 1478 struct proc_dir_entry *entry; 1479 1480 entry = proc_mkdir("fs/nfs", NULL); 1481 if (!entry) 1482 return -ENOMEM; 1483 entry = proc_create("exports", 0, entry, &exports_proc_ops); 1484 if (!entry) { 1485 remove_proc_entry("fs/nfs", NULL); 1486 return -ENOMEM; 1487 } 1488 return 0; 1489 } 1490 #else /* CONFIG_PROC_FS */ 1491 static int create_proc_exports_entry(void) 1492 { 1493 return 0; 1494 } 1495 #endif 1496 1497 unsigned int nfsd_net_id; 1498 1499 /** 1500 * nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit 1501 * @cb: netlink metadata and command arguments 1502 * 1503 * Return values: 1504 * %0: The rpc_status_get command may proceed 1505 * %-ENODEV: There is no NFSD running in this namespace 1506 */ 1507 int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb) 1508 { 1509 struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id); 1510 int ret = -ENODEV; 1511 1512 mutex_lock(&nfsd_mutex); 1513 if (nn->nfsd_serv) { 1514 svc_get(nn->nfsd_serv); 1515 ret = 0; 1516 } 1517 mutex_unlock(&nfsd_mutex); 1518 1519 return ret; 1520 } 1521 1522 static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb, 1523 struct netlink_callback *cb, 1524 struct nfsd_genl_rqstp *rqstp) 1525 { 1526 void *hdr; 1527 u32 i; 1528 1529 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 1530 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET); 1531 if (!hdr) 1532 return -ENOBUFS; 1533 1534 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) || 1535 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) || 1536 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) || 1537 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) || 1538 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) || 1539 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME, 1540 ktime_to_us(rqstp->rq_stime), 1541 NFSD_A_RPC_STATUS_PAD)) 1542 return -ENOBUFS; 1543 1544 switch (rqstp->rq_saddr.sa_family) { 1545 case AF_INET: { 1546 const struct sockaddr_in *s_in, *d_in; 1547 1548 s_in = (const struct sockaddr_in *)&rqstp->rq_saddr; 1549 d_in = (const struct sockaddr_in *)&rqstp->rq_daddr; 1550 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4, 1551 s_in->sin_addr.s_addr) || 1552 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4, 1553 d_in->sin_addr.s_addr) || 1554 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT, 1555 s_in->sin_port) || 1556 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT, 1557 d_in->sin_port)) 1558 return -ENOBUFS; 1559 break; 1560 } 1561 case AF_INET6: { 1562 const struct sockaddr_in6 *s_in, *d_in; 1563 1564 s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr; 1565 d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr; 1566 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6, 1567 &s_in->sin6_addr) || 1568 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6, 1569 &d_in->sin6_addr) || 1570 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT, 1571 s_in->sin6_port) || 1572 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT, 1573 d_in->sin6_port)) 1574 return -ENOBUFS; 1575 break; 1576 } 1577 } 1578 1579 for (i = 0; i < rqstp->rq_opcnt; i++) 1580 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS, 1581 rqstp->rq_opnum[i])) 1582 return -ENOBUFS; 1583 1584 genlmsg_end(skb, hdr); 1585 return 0; 1586 } 1587 1588 /** 1589 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit 1590 * @skb: reply buffer 1591 * @cb: netlink metadata and command arguments 1592 * 1593 * Returns the size of the reply or a negative errno. 1594 */ 1595 int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb, 1596 struct netlink_callback *cb) 1597 { 1598 struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id); 1599 int i, ret, rqstp_index = 0; 1600 1601 rcu_read_lock(); 1602 1603 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) { 1604 struct svc_rqst *rqstp; 1605 1606 if (i < cb->args[0]) /* already consumed */ 1607 continue; 1608 1609 rqstp_index = 0; 1610 list_for_each_entry_rcu(rqstp, 1611 &nn->nfsd_serv->sv_pools[i].sp_all_threads, 1612 rq_all) { 1613 struct nfsd_genl_rqstp genl_rqstp; 1614 unsigned int status_counter; 1615 1616 if (rqstp_index++ < cb->args[1]) /* already consumed */ 1617 continue; 1618 /* 1619 * Acquire rq_status_counter before parsing the rqst 1620 * fields. rq_status_counter is set to an odd value in 1621 * order to notify the consumers the rqstp fields are 1622 * meaningful. 1623 */ 1624 status_counter = 1625 smp_load_acquire(&rqstp->rq_status_counter); 1626 if (!(status_counter & 1)) 1627 continue; 1628 1629 genl_rqstp.rq_xid = rqstp->rq_xid; 1630 genl_rqstp.rq_flags = rqstp->rq_flags; 1631 genl_rqstp.rq_vers = rqstp->rq_vers; 1632 genl_rqstp.rq_prog = rqstp->rq_prog; 1633 genl_rqstp.rq_proc = rqstp->rq_proc; 1634 genl_rqstp.rq_stime = rqstp->rq_stime; 1635 genl_rqstp.rq_opcnt = 0; 1636 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp), 1637 sizeof(struct sockaddr)); 1638 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp), 1639 sizeof(struct sockaddr)); 1640 1641 #ifdef CONFIG_NFSD_V4 1642 if (rqstp->rq_vers == NFS4_VERSION && 1643 rqstp->rq_proc == NFSPROC4_COMPOUND) { 1644 /* NFSv4 compound */ 1645 struct nfsd4_compoundargs *args; 1646 int j; 1647 1648 args = rqstp->rq_argp; 1649 genl_rqstp.rq_opcnt = args->opcnt; 1650 for (j = 0; j < genl_rqstp.rq_opcnt; j++) 1651 genl_rqstp.rq_opnum[j] = 1652 args->ops[j].opnum; 1653 } 1654 #endif /* CONFIG_NFSD_V4 */ 1655 1656 /* 1657 * Acquire rq_status_counter before reporting the rqst 1658 * fields to the user. 1659 */ 1660 if (smp_load_acquire(&rqstp->rq_status_counter) != 1661 status_counter) 1662 continue; 1663 1664 ret = nfsd_genl_rpc_status_compose_msg(skb, cb, 1665 &genl_rqstp); 1666 if (ret) 1667 goto out; 1668 } 1669 } 1670 1671 cb->args[0] = i; 1672 cb->args[1] = rqstp_index; 1673 ret = skb->len; 1674 out: 1675 rcu_read_unlock(); 1676 1677 return ret; 1678 } 1679 1680 /** 1681 * nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing 1682 * @cb: netlink metadata and command arguments 1683 * 1684 * Return values: 1685 * %0: Success 1686 */ 1687 int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb) 1688 { 1689 mutex_lock(&nfsd_mutex); 1690 nfsd_put(sock_net(cb->skb->sk)); 1691 mutex_unlock(&nfsd_mutex); 1692 1693 return 0; 1694 } 1695 1696 /** 1697 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace 1698 * @net: a freshly-created network namespace 1699 * 1700 * This information stays around as long as the network namespace is 1701 * alive whether or not there is an NFSD instance running in the 1702 * namespace. 1703 * 1704 * Returns zero on success, or a negative errno otherwise. 1705 */ 1706 static __net_init int nfsd_net_init(struct net *net) 1707 { 1708 int retval; 1709 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1710 1711 retval = nfsd_export_init(net); 1712 if (retval) 1713 goto out_export_error; 1714 retval = nfsd_idmap_init(net); 1715 if (retval) 1716 goto out_idmap_error; 1717 retval = nfsd_net_reply_cache_init(nn); 1718 if (retval) 1719 goto out_repcache_error; 1720 nn->nfsd_versions = NULL; 1721 nn->nfsd4_minorversions = NULL; 1722 nfsd4_init_leases_net(nn); 1723 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key)); 1724 seqlock_init(&nn->writeverf_lock); 1725 1726 return 0; 1727 1728 out_repcache_error: 1729 nfsd_idmap_shutdown(net); 1730 out_idmap_error: 1731 nfsd_export_shutdown(net); 1732 out_export_error: 1733 return retval; 1734 } 1735 1736 /** 1737 * nfsd_net_exit - Release the nfsd_net portion of a net namespace 1738 * @net: a network namespace that is about to be destroyed 1739 * 1740 */ 1741 static __net_exit void nfsd_net_exit(struct net *net) 1742 { 1743 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1744 1745 nfsd_net_reply_cache_destroy(nn); 1746 nfsd_idmap_shutdown(net); 1747 nfsd_export_shutdown(net); 1748 nfsd_netns_free_versions(nn); 1749 } 1750 1751 static struct pernet_operations nfsd_net_ops = { 1752 .init = nfsd_net_init, 1753 .exit = nfsd_net_exit, 1754 .id = &nfsd_net_id, 1755 .size = sizeof(struct nfsd_net), 1756 }; 1757 1758 static int __init init_nfsd(void) 1759 { 1760 int retval; 1761 1762 retval = nfsd4_init_slabs(); 1763 if (retval) 1764 return retval; 1765 retval = nfsd4_init_pnfs(); 1766 if (retval) 1767 goto out_free_slabs; 1768 retval = nfsd_stat_init(); /* Statistics */ 1769 if (retval) 1770 goto out_free_pnfs; 1771 retval = nfsd_drc_slab_create(); 1772 if (retval) 1773 goto out_free_stat; 1774 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1775 retval = create_proc_exports_entry(); 1776 if (retval) 1777 goto out_free_lockd; 1778 retval = register_pernet_subsys(&nfsd_net_ops); 1779 if (retval < 0) 1780 goto out_free_exports; 1781 retval = register_cld_notifier(); 1782 if (retval) 1783 goto out_free_subsys; 1784 retval = nfsd4_create_laundry_wq(); 1785 if (retval) 1786 goto out_free_cld; 1787 retval = register_filesystem(&nfsd_fs_type); 1788 if (retval) 1789 goto out_free_all; 1790 retval = genl_register_family(&nfsd_nl_family); 1791 if (retval) 1792 goto out_free_all; 1793 1794 return 0; 1795 out_free_all: 1796 nfsd4_destroy_laundry_wq(); 1797 out_free_cld: 1798 unregister_cld_notifier(); 1799 out_free_subsys: 1800 unregister_pernet_subsys(&nfsd_net_ops); 1801 out_free_exports: 1802 remove_proc_entry("fs/nfs/exports", NULL); 1803 remove_proc_entry("fs/nfs", NULL); 1804 out_free_lockd: 1805 nfsd_lockd_shutdown(); 1806 nfsd_drc_slab_free(); 1807 out_free_stat: 1808 nfsd_stat_shutdown(); 1809 out_free_pnfs: 1810 nfsd4_exit_pnfs(); 1811 out_free_slabs: 1812 nfsd4_free_slabs(); 1813 return retval; 1814 } 1815 1816 static void __exit exit_nfsd(void) 1817 { 1818 genl_unregister_family(&nfsd_nl_family); 1819 unregister_filesystem(&nfsd_fs_type); 1820 nfsd4_destroy_laundry_wq(); 1821 unregister_cld_notifier(); 1822 unregister_pernet_subsys(&nfsd_net_ops); 1823 nfsd_drc_slab_free(); 1824 remove_proc_entry("fs/nfs/exports", NULL); 1825 remove_proc_entry("fs/nfs", NULL); 1826 nfsd_stat_shutdown(); 1827 nfsd_lockd_shutdown(); 1828 nfsd4_free_slabs(); 1829 nfsd4_exit_pnfs(); 1830 } 1831 1832 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1833 MODULE_DESCRIPTION("In-kernel NFS server"); 1834 MODULE_LICENSE("GPL"); 1835 module_init(init_nfsd) 1836 module_exit(exit_nfsd) 1837