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 && !nn->nfsd_serv->sv_nrthreads && !nn->keep_active) 709 nfsd_last_thread(net); 710 else if (err >= 0 && 711 !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 712 svc_get(nn->nfsd_serv); 713 714 nfsd_put(net); 715 return err; 716 } 717 718 /* 719 * A transport listener is added by writing its transport name and 720 * a port number. 721 */ 722 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred) 723 { 724 char transport[16]; 725 struct svc_xprt *xprt; 726 int port, err; 727 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 728 729 if (sscanf(buf, "%15s %5u", transport, &port) != 2) 730 return -EINVAL; 731 732 if (port < 1 || port > USHRT_MAX) 733 return -EINVAL; 734 trace_nfsd_ctl_ports_addxprt(net, transport, port); 735 736 err = nfsd_create_serv(net); 737 if (err != 0) 738 return err; 739 740 err = svc_xprt_create(nn->nfsd_serv, transport, net, 741 PF_INET, port, SVC_SOCK_ANONYMOUS, cred); 742 if (err < 0) 743 goto out_err; 744 745 err = svc_xprt_create(nn->nfsd_serv, transport, net, 746 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred); 747 if (err < 0 && err != -EAFNOSUPPORT) 748 goto out_close; 749 750 if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1)) 751 svc_get(nn->nfsd_serv); 752 753 nfsd_put(net); 754 return 0; 755 out_close: 756 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port); 757 if (xprt != NULL) { 758 svc_xprt_close(xprt); 759 svc_xprt_put(xprt); 760 } 761 out_err: 762 if (!nn->nfsd_serv->sv_nrthreads && !nn->keep_active) 763 nfsd_last_thread(net); 764 765 nfsd_put(net); 766 return err; 767 } 768 769 static ssize_t __write_ports(struct file *file, char *buf, size_t size, 770 struct net *net) 771 { 772 if (size == 0) 773 return __write_ports_names(buf, net); 774 775 if (isdigit(buf[0])) 776 return __write_ports_addfd(buf, net, file->f_cred); 777 778 if (isalpha(buf[0])) 779 return __write_ports_addxprt(buf, net, file->f_cred); 780 781 return -EINVAL; 782 } 783 784 /* 785 * write_ports - Pass a socket file descriptor or transport name to listen on 786 * 787 * Input: 788 * buf: ignored 789 * size: zero 790 * Output: 791 * On success: passed-in buffer filled with a '\n'-terminated C 792 * string containing a whitespace-separated list of 793 * named NFSD listeners; 794 * return code is the size in bytes of the string 795 * On error: return code is zero or a negative errno value 796 * 797 * OR 798 * 799 * Input: 800 * buf: C string containing an unsigned 801 * integer value representing a bound 802 * but unconnected socket that is to be 803 * used as an NFSD listener; listen(3) 804 * must be called for a SOCK_STREAM 805 * socket, otherwise it is ignored 806 * size: non-zero length of C string in @buf 807 * Output: 808 * On success: NFS service is started; 809 * passed-in buffer filled with a '\n'-terminated C 810 * string containing a unique alphanumeric name of 811 * the listener; 812 * return code is the size in bytes of the string 813 * On error: return code is a negative errno value 814 * 815 * OR 816 * 817 * Input: 818 * buf: C string containing a transport 819 * name and an unsigned integer value 820 * representing the port to listen on, 821 * separated by whitespace 822 * size: non-zero length of C string in @buf 823 * Output: 824 * On success: returns zero; NFS service is started 825 * On error: return code is a negative errno value 826 */ 827 static ssize_t write_ports(struct file *file, char *buf, size_t size) 828 { 829 ssize_t rv; 830 831 mutex_lock(&nfsd_mutex); 832 rv = __write_ports(file, buf, size, netns(file)); 833 mutex_unlock(&nfsd_mutex); 834 return rv; 835 } 836 837 838 int nfsd_max_blksize; 839 840 /* 841 * write_maxblksize - Set or report the current NFS blksize 842 * 843 * Input: 844 * buf: ignored 845 * size: zero 846 * 847 * OR 848 * 849 * Input: 850 * buf: C string containing an unsigned 851 * integer value representing the new 852 * NFS blksize 853 * size: non-zero length of C string in @buf 854 * Output: 855 * On success: passed-in buffer filled with '\n'-terminated C string 856 * containing numeric value of the current NFS blksize 857 * setting; 858 * return code is the size in bytes of the string 859 * On error: return code is zero or a negative errno value 860 */ 861 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 862 { 863 char *mesg = buf; 864 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 865 866 if (size > 0) { 867 int bsize; 868 int rv = get_int(&mesg, &bsize); 869 if (rv) 870 return rv; 871 trace_nfsd_ctl_maxblksize(netns(file), bsize); 872 873 /* force bsize into allowed range and 874 * required alignment. 875 */ 876 bsize = max_t(int, bsize, 1024); 877 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE); 878 bsize &= ~(1024-1); 879 mutex_lock(&nfsd_mutex); 880 if (nn->nfsd_serv) { 881 mutex_unlock(&nfsd_mutex); 882 return -EBUSY; 883 } 884 nfsd_max_blksize = bsize; 885 mutex_unlock(&nfsd_mutex); 886 } 887 888 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 889 nfsd_max_blksize); 890 } 891 892 /* 893 * write_maxconn - Set or report the current max number of connections 894 * 895 * Input: 896 * buf: ignored 897 * size: zero 898 * OR 899 * 900 * Input: 901 * buf: C string containing an unsigned 902 * integer value representing the new 903 * number of max connections 904 * size: non-zero length of C string in @buf 905 * Output: 906 * On success: passed-in buffer filled with '\n'-terminated C string 907 * containing numeric value of max_connections setting 908 * for this net namespace; 909 * return code is the size in bytes of the string 910 * On error: return code is zero or a negative errno value 911 */ 912 static ssize_t write_maxconn(struct file *file, char *buf, size_t size) 913 { 914 char *mesg = buf; 915 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 916 unsigned int maxconn = nn->max_connections; 917 918 if (size > 0) { 919 int rv = get_uint(&mesg, &maxconn); 920 921 if (rv) 922 return rv; 923 trace_nfsd_ctl_maxconn(netns(file), maxconn); 924 nn->max_connections = maxconn; 925 } 926 927 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn); 928 } 929 930 #ifdef CONFIG_NFSD_V4 931 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, 932 time64_t *time, struct nfsd_net *nn) 933 { 934 struct dentry *dentry = file_dentry(file); 935 char *mesg = buf; 936 int rv, i; 937 938 if (size > 0) { 939 if (nn->nfsd_serv) 940 return -EBUSY; 941 rv = get_int(&mesg, &i); 942 if (rv) 943 return rv; 944 trace_nfsd_ctl_time(netns(file), dentry->d_name.name, 945 dentry->d_name.len, i); 946 947 /* 948 * Some sanity checking. We don't have a reason for 949 * these particular numbers, but problems with the 950 * extremes are: 951 * - Too short: the briefest network outage may 952 * cause clients to lose all their locks. Also, 953 * the frequent polling may be wasteful. 954 * - Too long: do you really want reboot recovery 955 * to take more than an hour? Or to make other 956 * clients wait an hour before being able to 957 * revoke a dead client's locks? 958 */ 959 if (i < 10 || i > 3600) 960 return -EINVAL; 961 *time = i; 962 } 963 964 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time); 965 } 966 967 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, 968 time64_t *time, struct nfsd_net *nn) 969 { 970 ssize_t rv; 971 972 mutex_lock(&nfsd_mutex); 973 rv = __nfsd4_write_time(file, buf, size, time, nn); 974 mutex_unlock(&nfsd_mutex); 975 return rv; 976 } 977 978 /* 979 * write_leasetime - Set or report the current NFSv4 lease time 980 * 981 * Input: 982 * buf: ignored 983 * size: zero 984 * 985 * OR 986 * 987 * Input: 988 * buf: C string containing an unsigned 989 * integer value representing the new 990 * NFSv4 lease expiry time 991 * size: non-zero length of C string in @buf 992 * Output: 993 * On success: passed-in buffer filled with '\n'-terminated C 994 * string containing unsigned integer value of the 995 * current lease expiry time; 996 * return code is the size in bytes of the string 997 * On error: return code is zero or a negative errno value 998 */ 999 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 1000 { 1001 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1002 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); 1003 } 1004 1005 /* 1006 * write_gracetime - Set or report current NFSv4 grace period time 1007 * 1008 * As above, but sets the time of the NFSv4 grace period. 1009 * 1010 * Note this should never be set to less than the *previous* 1011 * lease-period time, but we don't try to enforce this. (In the common 1012 * case (a new boot), we don't know what the previous lease time was 1013 * anyway.) 1014 */ 1015 static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1016 { 1017 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1018 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); 1019 } 1020 1021 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, 1022 struct nfsd_net *nn) 1023 { 1024 char *mesg = buf; 1025 char *recdir; 1026 int len, status; 1027 1028 if (size > 0) { 1029 if (nn->nfsd_serv) 1030 return -EBUSY; 1031 if (size > PATH_MAX || buf[size-1] != '\n') 1032 return -EINVAL; 1033 buf[size-1] = 0; 1034 1035 recdir = mesg; 1036 len = qword_get(&mesg, recdir, size); 1037 if (len <= 0) 1038 return -EINVAL; 1039 trace_nfsd_ctl_recoverydir(netns(file), recdir); 1040 1041 status = nfs4_reset_recoverydir(recdir); 1042 if (status) 1043 return status; 1044 } 1045 1046 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1047 nfs4_recoverydir()); 1048 } 1049 1050 /* 1051 * write_recoverydir - Set or report the pathname of the recovery directory 1052 * 1053 * Input: 1054 * buf: ignored 1055 * size: zero 1056 * 1057 * OR 1058 * 1059 * Input: 1060 * buf: C string containing the pathname 1061 * of the directory on a local file 1062 * system containing permanent NFSv4 1063 * recovery data 1064 * size: non-zero length of C string in @buf 1065 * Output: 1066 * On success: passed-in buffer filled with '\n'-terminated C string 1067 * containing the current recovery pathname setting; 1068 * return code is the size in bytes of the string 1069 * On error: return code is zero or a negative errno value 1070 */ 1071 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1072 { 1073 ssize_t rv; 1074 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1075 1076 mutex_lock(&nfsd_mutex); 1077 rv = __write_recoverydir(file, buf, size, nn); 1078 mutex_unlock(&nfsd_mutex); 1079 return rv; 1080 } 1081 1082 /* 1083 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager 1084 * 1085 * Input: 1086 * buf: ignored 1087 * size: zero 1088 * OR 1089 * 1090 * Input: 1091 * buf: any value 1092 * size: non-zero length of C string in @buf 1093 * Output: 1094 * passed-in buffer filled with "Y" or "N" with a newline 1095 * and NULL-terminated C string. This indicates whether 1096 * the grace period has ended in the current net 1097 * namespace. Return code is the size in bytes of the 1098 * string. Writing a string that starts with 'Y', 'y', or 1099 * '1' to the file will end the grace period for nfsd's v4 1100 * lock manager. 1101 */ 1102 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) 1103 { 1104 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1105 1106 if (size > 0) { 1107 switch(buf[0]) { 1108 case 'Y': 1109 case 'y': 1110 case '1': 1111 if (!nn->nfsd_serv) 1112 return -EBUSY; 1113 trace_nfsd_end_grace(netns(file)); 1114 nfsd4_end_grace(nn); 1115 break; 1116 default: 1117 return -EINVAL; 1118 } 1119 } 1120 1121 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n", 1122 nn->grace_ended ? 'Y' : 'N'); 1123 } 1124 1125 #endif 1126 1127 /*----------------------------------------------------------------------------*/ 1128 /* 1129 * populating the filesystem. 1130 */ 1131 1132 /* Basically copying rpc_get_inode. */ 1133 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) 1134 { 1135 struct inode *inode = new_inode(sb); 1136 if (!inode) 1137 return NULL; 1138 /* Following advice from simple_fill_super documentation: */ 1139 inode->i_ino = iunique(sb, NFSD_MaxReserved); 1140 inode->i_mode = mode; 1141 simple_inode_init_ts(inode); 1142 switch (mode & S_IFMT) { 1143 case S_IFDIR: 1144 inode->i_fop = &simple_dir_operations; 1145 inode->i_op = &simple_dir_inode_operations; 1146 inc_nlink(inode); 1147 break; 1148 case S_IFLNK: 1149 inode->i_op = &simple_symlink_inode_operations; 1150 break; 1151 default: 1152 break; 1153 } 1154 return inode; 1155 } 1156 1157 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl) 1158 { 1159 struct inode *inode; 1160 1161 inode = nfsd_get_inode(dir->i_sb, mode); 1162 if (!inode) 1163 return -ENOMEM; 1164 if (ncl) { 1165 inode->i_private = ncl; 1166 kref_get(&ncl->cl_ref); 1167 } 1168 d_add(dentry, inode); 1169 inc_nlink(dir); 1170 fsnotify_mkdir(dir, dentry); 1171 return 0; 1172 } 1173 1174 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name) 1175 { 1176 struct inode *dir = parent->d_inode; 1177 struct dentry *dentry; 1178 int ret = -ENOMEM; 1179 1180 inode_lock(dir); 1181 dentry = d_alloc_name(parent, name); 1182 if (!dentry) 1183 goto out_err; 1184 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl); 1185 if (ret) 1186 goto out_err; 1187 out: 1188 inode_unlock(dir); 1189 return dentry; 1190 out_err: 1191 dput(dentry); 1192 dentry = ERR_PTR(ret); 1193 goto out; 1194 } 1195 1196 #if IS_ENABLED(CONFIG_SUNRPC_GSS) 1197 static int __nfsd_symlink(struct inode *dir, struct dentry *dentry, 1198 umode_t mode, const char *content) 1199 { 1200 struct inode *inode; 1201 1202 inode = nfsd_get_inode(dir->i_sb, mode); 1203 if (!inode) 1204 return -ENOMEM; 1205 1206 inode->i_link = (char *)content; 1207 inode->i_size = strlen(content); 1208 1209 d_add(dentry, inode); 1210 inc_nlink(dir); 1211 fsnotify_create(dir, dentry); 1212 return 0; 1213 } 1214 1215 /* 1216 * @content is assumed to be a NUL-terminated string that lives 1217 * longer than the symlink itself. 1218 */ 1219 static void _nfsd_symlink(struct dentry *parent, const char *name, 1220 const char *content) 1221 { 1222 struct inode *dir = parent->d_inode; 1223 struct dentry *dentry; 1224 int ret; 1225 1226 inode_lock(dir); 1227 dentry = d_alloc_name(parent, name); 1228 if (!dentry) 1229 goto out; 1230 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content); 1231 if (ret) 1232 dput(dentry); 1233 out: 1234 inode_unlock(dir); 1235 } 1236 #else 1237 static inline void _nfsd_symlink(struct dentry *parent, const char *name, 1238 const char *content) 1239 { 1240 } 1241 1242 #endif 1243 1244 static void clear_ncl(struct inode *inode) 1245 { 1246 struct nfsdfs_client *ncl = inode->i_private; 1247 1248 inode->i_private = NULL; 1249 kref_put(&ncl->cl_ref, ncl->cl_release); 1250 } 1251 1252 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode) 1253 { 1254 struct nfsdfs_client *nc = inode->i_private; 1255 1256 if (nc) 1257 kref_get(&nc->cl_ref); 1258 return nc; 1259 } 1260 1261 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode) 1262 { 1263 struct nfsdfs_client *nc; 1264 1265 inode_lock_shared(inode); 1266 nc = __get_nfsdfs_client(inode); 1267 inode_unlock_shared(inode); 1268 return nc; 1269 } 1270 /* from __rpc_unlink */ 1271 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry) 1272 { 1273 int ret; 1274 1275 clear_ncl(d_inode(dentry)); 1276 dget(dentry); 1277 ret = simple_unlink(dir, dentry); 1278 d_drop(dentry); 1279 fsnotify_unlink(dir, dentry); 1280 dput(dentry); 1281 WARN_ON_ONCE(ret); 1282 } 1283 1284 static void nfsdfs_remove_files(struct dentry *root) 1285 { 1286 struct dentry *dentry, *tmp; 1287 1288 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) { 1289 if (!simple_positive(dentry)) { 1290 WARN_ON_ONCE(1); /* I think this can't happen? */ 1291 continue; 1292 } 1293 nfsdfs_remove_file(d_inode(root), dentry); 1294 } 1295 } 1296 1297 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share 1298 * code instead. */ 1299 static int nfsdfs_create_files(struct dentry *root, 1300 const struct tree_descr *files, 1301 struct dentry **fdentries) 1302 { 1303 struct inode *dir = d_inode(root); 1304 struct inode *inode; 1305 struct dentry *dentry; 1306 int i; 1307 1308 inode_lock(dir); 1309 for (i = 0; files->name && files->name[0]; i++, files++) { 1310 dentry = d_alloc_name(root, files->name); 1311 if (!dentry) 1312 goto out; 1313 inode = nfsd_get_inode(d_inode(root)->i_sb, 1314 S_IFREG | files->mode); 1315 if (!inode) { 1316 dput(dentry); 1317 goto out; 1318 } 1319 inode->i_fop = files->ops; 1320 inode->i_private = __get_nfsdfs_client(dir); 1321 d_add(dentry, inode); 1322 fsnotify_create(dir, dentry); 1323 if (fdentries) 1324 fdentries[i] = dentry; 1325 } 1326 inode_unlock(dir); 1327 return 0; 1328 out: 1329 nfsdfs_remove_files(root); 1330 inode_unlock(dir); 1331 return -ENOMEM; 1332 } 1333 1334 /* on success, returns positive number unique to that client. */ 1335 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, 1336 struct nfsdfs_client *ncl, u32 id, 1337 const struct tree_descr *files, 1338 struct dentry **fdentries) 1339 { 1340 struct dentry *dentry; 1341 char name[11]; 1342 int ret; 1343 1344 sprintf(name, "%u", id); 1345 1346 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name); 1347 if (IS_ERR(dentry)) /* XXX: tossing errors? */ 1348 return NULL; 1349 ret = nfsdfs_create_files(dentry, files, fdentries); 1350 if (ret) { 1351 nfsd_client_rmdir(dentry); 1352 return NULL; 1353 } 1354 return dentry; 1355 } 1356 1357 /* Taken from __rpc_rmdir: */ 1358 void nfsd_client_rmdir(struct dentry *dentry) 1359 { 1360 struct inode *dir = d_inode(dentry->d_parent); 1361 struct inode *inode = d_inode(dentry); 1362 int ret; 1363 1364 inode_lock(dir); 1365 nfsdfs_remove_files(dentry); 1366 clear_ncl(inode); 1367 dget(dentry); 1368 ret = simple_rmdir(dir, dentry); 1369 WARN_ON_ONCE(ret); 1370 d_drop(dentry); 1371 fsnotify_rmdir(dir, dentry); 1372 dput(dentry); 1373 inode_unlock(dir); 1374 } 1375 1376 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) 1377 { 1378 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 1379 nfsd_net_id); 1380 struct dentry *dentry; 1381 int ret; 1382 1383 static const struct tree_descr nfsd_files[] = { 1384 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, 1385 /* Per-export io stats use same ops as exports file */ 1386 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO}, 1387 [NFSD_Export_features] = {"export_features", 1388 &export_features_fops, S_IRUGO}, 1389 [NFSD_FO_UnlockIP] = {"unlock_ip", 1390 &transaction_ops, S_IWUSR|S_IRUSR}, 1391 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1392 &transaction_ops, S_IWUSR|S_IRUSR}, 1393 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1394 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1395 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1396 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1397 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", 1398 &nfsd_reply_cache_stats_fops, S_IRUGO}, 1399 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1400 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1401 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1402 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO}, 1403 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO}, 1404 #ifdef CONFIG_NFSD_V4 1405 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1406 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1407 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1408 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, 1409 #endif 1410 /* last one */ {""} 1411 }; 1412 1413 ret = simple_fill_super(sb, 0x6e667364, nfsd_files); 1414 if (ret) 1415 return ret; 1416 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes", 1417 "/proc/net/rpc/gss_krb5_enctypes"); 1418 dentry = nfsd_mkdir(sb->s_root, NULL, "clients"); 1419 if (IS_ERR(dentry)) 1420 return PTR_ERR(dentry); 1421 nn->nfsd_client_dir = dentry; 1422 return 0; 1423 } 1424 1425 static int nfsd_fs_get_tree(struct fs_context *fc) 1426 { 1427 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns)); 1428 } 1429 1430 static void nfsd_fs_free_fc(struct fs_context *fc) 1431 { 1432 if (fc->s_fs_info) 1433 put_net(fc->s_fs_info); 1434 } 1435 1436 static const struct fs_context_operations nfsd_fs_context_ops = { 1437 .free = nfsd_fs_free_fc, 1438 .get_tree = nfsd_fs_get_tree, 1439 }; 1440 1441 static int nfsd_init_fs_context(struct fs_context *fc) 1442 { 1443 put_user_ns(fc->user_ns); 1444 fc->user_ns = get_user_ns(fc->net_ns->user_ns); 1445 fc->ops = &nfsd_fs_context_ops; 1446 return 0; 1447 } 1448 1449 static void nfsd_umount(struct super_block *sb) 1450 { 1451 struct net *net = sb->s_fs_info; 1452 1453 nfsd_shutdown_threads(net); 1454 1455 kill_litter_super(sb); 1456 put_net(net); 1457 } 1458 1459 static struct file_system_type nfsd_fs_type = { 1460 .owner = THIS_MODULE, 1461 .name = "nfsd", 1462 .init_fs_context = nfsd_init_fs_context, 1463 .kill_sb = nfsd_umount, 1464 }; 1465 MODULE_ALIAS_FS("nfsd"); 1466 1467 #ifdef CONFIG_PROC_FS 1468 1469 static int exports_proc_open(struct inode *inode, struct file *file) 1470 { 1471 return exports_net_open(current->nsproxy->net_ns, file); 1472 } 1473 1474 static const struct proc_ops exports_proc_ops = { 1475 .proc_open = exports_proc_open, 1476 .proc_read = seq_read, 1477 .proc_lseek = seq_lseek, 1478 .proc_release = seq_release, 1479 }; 1480 1481 static int create_proc_exports_entry(void) 1482 { 1483 struct proc_dir_entry *entry; 1484 1485 entry = proc_mkdir("fs/nfs", NULL); 1486 if (!entry) 1487 return -ENOMEM; 1488 entry = proc_create("exports", 0, entry, &exports_proc_ops); 1489 if (!entry) { 1490 remove_proc_entry("fs/nfs", NULL); 1491 return -ENOMEM; 1492 } 1493 return 0; 1494 } 1495 #else /* CONFIG_PROC_FS */ 1496 static int create_proc_exports_entry(void) 1497 { 1498 return 0; 1499 } 1500 #endif 1501 1502 unsigned int nfsd_net_id; 1503 1504 /** 1505 * nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit 1506 * @cb: netlink metadata and command arguments 1507 * 1508 * Return values: 1509 * %0: The rpc_status_get command may proceed 1510 * %-ENODEV: There is no NFSD running in this namespace 1511 */ 1512 int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb) 1513 { 1514 struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id); 1515 int ret = -ENODEV; 1516 1517 mutex_lock(&nfsd_mutex); 1518 if (nn->nfsd_serv) 1519 ret = 0; 1520 else 1521 mutex_unlock(&nfsd_mutex); 1522 1523 return ret; 1524 } 1525 1526 static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb, 1527 struct netlink_callback *cb, 1528 struct nfsd_genl_rqstp *rqstp) 1529 { 1530 void *hdr; 1531 u32 i; 1532 1533 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 1534 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET); 1535 if (!hdr) 1536 return -ENOBUFS; 1537 1538 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) || 1539 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) || 1540 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) || 1541 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) || 1542 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) || 1543 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME, 1544 ktime_to_us(rqstp->rq_stime), 1545 NFSD_A_RPC_STATUS_PAD)) 1546 return -ENOBUFS; 1547 1548 switch (rqstp->rq_saddr.sa_family) { 1549 case AF_INET: { 1550 const struct sockaddr_in *s_in, *d_in; 1551 1552 s_in = (const struct sockaddr_in *)&rqstp->rq_saddr; 1553 d_in = (const struct sockaddr_in *)&rqstp->rq_daddr; 1554 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4, 1555 s_in->sin_addr.s_addr) || 1556 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4, 1557 d_in->sin_addr.s_addr) || 1558 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT, 1559 s_in->sin_port) || 1560 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT, 1561 d_in->sin_port)) 1562 return -ENOBUFS; 1563 break; 1564 } 1565 case AF_INET6: { 1566 const struct sockaddr_in6 *s_in, *d_in; 1567 1568 s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr; 1569 d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr; 1570 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6, 1571 &s_in->sin6_addr) || 1572 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6, 1573 &d_in->sin6_addr) || 1574 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT, 1575 s_in->sin6_port) || 1576 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT, 1577 d_in->sin6_port)) 1578 return -ENOBUFS; 1579 break; 1580 } 1581 } 1582 1583 for (i = 0; i < rqstp->rq_opcnt; i++) 1584 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS, 1585 rqstp->rq_opnum[i])) 1586 return -ENOBUFS; 1587 1588 genlmsg_end(skb, hdr); 1589 return 0; 1590 } 1591 1592 /** 1593 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit 1594 * @skb: reply buffer 1595 * @cb: netlink metadata and command arguments 1596 * 1597 * Returns the size of the reply or a negative errno. 1598 */ 1599 int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb, 1600 struct netlink_callback *cb) 1601 { 1602 struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id); 1603 int i, ret, rqstp_index = 0; 1604 1605 rcu_read_lock(); 1606 1607 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) { 1608 struct svc_rqst *rqstp; 1609 1610 if (i < cb->args[0]) /* already consumed */ 1611 continue; 1612 1613 rqstp_index = 0; 1614 list_for_each_entry_rcu(rqstp, 1615 &nn->nfsd_serv->sv_pools[i].sp_all_threads, 1616 rq_all) { 1617 struct nfsd_genl_rqstp genl_rqstp; 1618 unsigned int status_counter; 1619 1620 if (rqstp_index++ < cb->args[1]) /* already consumed */ 1621 continue; 1622 /* 1623 * Acquire rq_status_counter before parsing the rqst 1624 * fields. rq_status_counter is set to an odd value in 1625 * order to notify the consumers the rqstp fields are 1626 * meaningful. 1627 */ 1628 status_counter = 1629 smp_load_acquire(&rqstp->rq_status_counter); 1630 if (!(status_counter & 1)) 1631 continue; 1632 1633 genl_rqstp.rq_xid = rqstp->rq_xid; 1634 genl_rqstp.rq_flags = rqstp->rq_flags; 1635 genl_rqstp.rq_vers = rqstp->rq_vers; 1636 genl_rqstp.rq_prog = rqstp->rq_prog; 1637 genl_rqstp.rq_proc = rqstp->rq_proc; 1638 genl_rqstp.rq_stime = rqstp->rq_stime; 1639 genl_rqstp.rq_opcnt = 0; 1640 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp), 1641 sizeof(struct sockaddr)); 1642 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp), 1643 sizeof(struct sockaddr)); 1644 1645 #ifdef CONFIG_NFSD_V4 1646 if (rqstp->rq_vers == NFS4_VERSION && 1647 rqstp->rq_proc == NFSPROC4_COMPOUND) { 1648 /* NFSv4 compound */ 1649 struct nfsd4_compoundargs *args; 1650 int j; 1651 1652 args = rqstp->rq_argp; 1653 genl_rqstp.rq_opcnt = args->opcnt; 1654 for (j = 0; j < genl_rqstp.rq_opcnt; j++) 1655 genl_rqstp.rq_opnum[j] = 1656 args->ops[j].opnum; 1657 } 1658 #endif /* CONFIG_NFSD_V4 */ 1659 1660 /* 1661 * Acquire rq_status_counter before reporting the rqst 1662 * fields to the user. 1663 */ 1664 if (smp_load_acquire(&rqstp->rq_status_counter) != 1665 status_counter) 1666 continue; 1667 1668 ret = nfsd_genl_rpc_status_compose_msg(skb, cb, 1669 &genl_rqstp); 1670 if (ret) 1671 goto out; 1672 } 1673 } 1674 1675 cb->args[0] = i; 1676 cb->args[1] = rqstp_index; 1677 ret = skb->len; 1678 out: 1679 rcu_read_unlock(); 1680 1681 return ret; 1682 } 1683 1684 /** 1685 * nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing 1686 * @cb: netlink metadata and command arguments 1687 * 1688 * Return values: 1689 * %0: Success 1690 */ 1691 int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb) 1692 { 1693 mutex_unlock(&nfsd_mutex); 1694 1695 return 0; 1696 } 1697 1698 /** 1699 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace 1700 * @net: a freshly-created network namespace 1701 * 1702 * This information stays around as long as the network namespace is 1703 * alive whether or not there is an NFSD instance running in the 1704 * namespace. 1705 * 1706 * Returns zero on success, or a negative errno otherwise. 1707 */ 1708 static __net_init int nfsd_net_init(struct net *net) 1709 { 1710 int retval; 1711 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1712 1713 retval = nfsd_export_init(net); 1714 if (retval) 1715 goto out_export_error; 1716 retval = nfsd_idmap_init(net); 1717 if (retval) 1718 goto out_idmap_error; 1719 retval = nfsd_net_reply_cache_init(nn); 1720 if (retval) 1721 goto out_repcache_error; 1722 nn->nfsd_versions = NULL; 1723 nn->nfsd4_minorversions = NULL; 1724 nfsd4_init_leases_net(nn); 1725 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key)); 1726 seqlock_init(&nn->writeverf_lock); 1727 1728 return 0; 1729 1730 out_repcache_error: 1731 nfsd_idmap_shutdown(net); 1732 out_idmap_error: 1733 nfsd_export_shutdown(net); 1734 out_export_error: 1735 return retval; 1736 } 1737 1738 /** 1739 * nfsd_net_exit - Release the nfsd_net portion of a net namespace 1740 * @net: a network namespace that is about to be destroyed 1741 * 1742 */ 1743 static __net_exit void nfsd_net_exit(struct net *net) 1744 { 1745 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1746 1747 nfsd_net_reply_cache_destroy(nn); 1748 nfsd_idmap_shutdown(net); 1749 nfsd_export_shutdown(net); 1750 nfsd_netns_free_versions(nn); 1751 } 1752 1753 static struct pernet_operations nfsd_net_ops = { 1754 .init = nfsd_net_init, 1755 .exit = nfsd_net_exit, 1756 .id = &nfsd_net_id, 1757 .size = sizeof(struct nfsd_net), 1758 }; 1759 1760 static int __init init_nfsd(void) 1761 { 1762 int retval; 1763 1764 retval = nfsd4_init_slabs(); 1765 if (retval) 1766 return retval; 1767 retval = nfsd4_init_pnfs(); 1768 if (retval) 1769 goto out_free_slabs; 1770 retval = nfsd_stat_init(); /* Statistics */ 1771 if (retval) 1772 goto out_free_pnfs; 1773 retval = nfsd_drc_slab_create(); 1774 if (retval) 1775 goto out_free_stat; 1776 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 1777 retval = create_proc_exports_entry(); 1778 if (retval) 1779 goto out_free_lockd; 1780 retval = register_pernet_subsys(&nfsd_net_ops); 1781 if (retval < 0) 1782 goto out_free_exports; 1783 retval = register_cld_notifier(); 1784 if (retval) 1785 goto out_free_subsys; 1786 retval = nfsd4_create_laundry_wq(); 1787 if (retval) 1788 goto out_free_cld; 1789 retval = register_filesystem(&nfsd_fs_type); 1790 if (retval) 1791 goto out_free_all; 1792 retval = genl_register_family(&nfsd_nl_family); 1793 if (retval) 1794 goto out_free_all; 1795 1796 return 0; 1797 out_free_all: 1798 nfsd4_destroy_laundry_wq(); 1799 out_free_cld: 1800 unregister_cld_notifier(); 1801 out_free_subsys: 1802 unregister_pernet_subsys(&nfsd_net_ops); 1803 out_free_exports: 1804 remove_proc_entry("fs/nfs/exports", NULL); 1805 remove_proc_entry("fs/nfs", NULL); 1806 out_free_lockd: 1807 nfsd_lockd_shutdown(); 1808 nfsd_drc_slab_free(); 1809 out_free_stat: 1810 nfsd_stat_shutdown(); 1811 out_free_pnfs: 1812 nfsd4_exit_pnfs(); 1813 out_free_slabs: 1814 nfsd4_free_slabs(); 1815 return retval; 1816 } 1817 1818 static void __exit exit_nfsd(void) 1819 { 1820 genl_unregister_family(&nfsd_nl_family); 1821 unregister_filesystem(&nfsd_fs_type); 1822 nfsd4_destroy_laundry_wq(); 1823 unregister_cld_notifier(); 1824 unregister_pernet_subsys(&nfsd_net_ops); 1825 nfsd_drc_slab_free(); 1826 remove_proc_entry("fs/nfs/exports", NULL); 1827 remove_proc_entry("fs/nfs", NULL); 1828 nfsd_stat_shutdown(); 1829 nfsd_lockd_shutdown(); 1830 nfsd4_free_slabs(); 1831 nfsd4_exit_pnfs(); 1832 } 1833 1834 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1835 MODULE_DESCRIPTION("In-kernel NFS server"); 1836 MODULE_LICENSE("GPL"); 1837 module_init(init_nfsd) 1838 module_exit(exit_nfsd) 1839