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/sunrpc/svc.h> 19 #include <linux/module.h> 20 #include <linux/fsnotify.h> 21 #include <linux/nfslocalio.h> 22 23 #include "idmap.h" 24 #include "nfsd.h" 25 #include "cache.h" 26 #include "state.h" 27 #include "netns.h" 28 #include "pnfs.h" 29 #include "filecache.h" 30 #include "trace.h" 31 #include "netlink.h" 32 33 /* 34 * We have a single directory with several nodes in it. 35 */ 36 enum { 37 NFSD_Root = 1, 38 NFSD_List, 39 NFSD_Export_Stats, 40 NFSD_Export_features, 41 NFSD_Fh, 42 NFSD_FO_UnlockIP, 43 NFSD_FO_UnlockFS, 44 NFSD_Threads, 45 NFSD_Pool_Threads, 46 NFSD_Pool_Stats, 47 NFSD_Reply_Cache_Stats, 48 NFSD_Versions, 49 NFSD_Ports, 50 NFSD_MaxBlkSize, 51 NFSD_Filecache, 52 NFSD_Leasetime, 53 NFSD_Gracetime, 54 NFSD_RecoveryDir, 55 NFSD_V4EndGrace, 56 NFSD_MaxReserved 57 }; 58 59 /* 60 * write() for these nodes. 61 */ 62 static ssize_t write_filehandle(struct file *file, char *buf, size_t size); 63 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); 64 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); 65 static ssize_t write_threads(struct file *file, char *buf, size_t size); 66 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); 67 static ssize_t write_versions(struct file *file, char *buf, size_t size); 68 static ssize_t write_ports(struct file *file, char *buf, size_t size); 69 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); 70 #ifdef CONFIG_NFSD_V4 71 static ssize_t write_leasetime(struct file *file, char *buf, size_t size); 72 static ssize_t write_gracetime(struct file *file, char *buf, size_t size); 73 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 74 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); 75 #endif 76 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size); 77 #endif 78 79 static ssize_t (*const write_op[])(struct file *, char *, size_t) = { 80 [NFSD_Fh] = write_filehandle, 81 [NFSD_FO_UnlockIP] = write_unlock_ip, 82 [NFSD_FO_UnlockFS] = write_unlock_fs, 83 [NFSD_Threads] = write_threads, 84 [NFSD_Pool_Threads] = write_pool_threads, 85 [NFSD_Versions] = write_versions, 86 [NFSD_Ports] = write_ports, 87 [NFSD_MaxBlkSize] = write_maxblksize, 88 #ifdef CONFIG_NFSD_V4 89 [NFSD_Leasetime] = write_leasetime, 90 [NFSD_Gracetime] = write_gracetime, 91 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 92 [NFSD_RecoveryDir] = write_recoverydir, 93 #endif 94 [NFSD_V4EndGrace] = write_v4_end_grace, 95 #endif 96 }; 97 98 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 99 { 100 ino_t ino = file_inode(file)->i_ino; 101 char *data; 102 ssize_t rv; 103 104 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 105 return -EINVAL; 106 107 data = simple_transaction_get(file, buf, size); 108 if (IS_ERR(data)) 109 return PTR_ERR(data); 110 111 rv = write_op[ino](file, data, size); 112 if (rv < 0) 113 return rv; 114 115 simple_transaction_set(file, rv); 116 return size; 117 } 118 119 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) 120 { 121 if (! file->private_data) { 122 /* An attempt to read a transaction file without writing 123 * causes a 0-byte write so that the file can return 124 * state information 125 */ 126 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); 127 if (rv < 0) 128 return rv; 129 } 130 return simple_transaction_read(file, buf, size, pos); 131 } 132 133 static const struct file_operations transaction_ops = { 134 .write = nfsctl_transaction_write, 135 .read = nfsctl_transaction_read, 136 .release = simple_transaction_release, 137 .llseek = default_llseek, 138 }; 139 140 static int exports_net_open(struct net *net, struct file *file) 141 { 142 int err; 143 struct seq_file *seq; 144 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 145 146 err = seq_open(file, &nfs_exports_op); 147 if (err) 148 return err; 149 150 seq = file->private_data; 151 seq->private = nn->svc_export_cache; 152 get_net(net); 153 return 0; 154 } 155 156 static int exports_release(struct inode *inode, struct file *file) 157 { 158 struct seq_file *seq = file->private_data; 159 struct cache_detail *cd = seq->private; 160 161 put_net(cd->net); 162 return seq_release(inode, file); 163 } 164 165 static int exports_nfsd_open(struct inode *inode, struct file *file) 166 { 167 return exports_net_open(inode->i_sb->s_fs_info, file); 168 } 169 170 static const struct file_operations exports_nfsd_operations = { 171 .open = exports_nfsd_open, 172 .read = seq_read, 173 .llseek = seq_lseek, 174 .release = exports_release, 175 }; 176 177 static int export_features_show(struct seq_file *m, void *v) 178 { 179 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); 180 return 0; 181 } 182 183 DEFINE_SHOW_ATTRIBUTE(export_features); 184 185 static int nfsd_pool_stats_open(struct inode *inode, struct file *file) 186 { 187 struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); 188 189 return svc_pool_stats_open(&nn->nfsd_info, file); 190 } 191 192 static const struct file_operations pool_stats_operations = { 193 .open = nfsd_pool_stats_open, 194 .read = seq_read, 195 .llseek = seq_lseek, 196 .release = seq_release, 197 }; 198 199 DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats); 200 201 DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats); 202 203 /*----------------------------------------------------------------------------*/ 204 /* 205 * payload - write methods 206 */ 207 208 static inline struct net *netns(struct file *file) 209 { 210 return file_inode(file)->i_sb->s_fs_info; 211 } 212 213 /* 214 * write_unlock_ip - Release all locks used by a client 215 * 216 * Experimental. 217 * 218 * Input: 219 * buf: '\n'-terminated C string containing a 220 * presentation format IP address 221 * size: length of C string in @buf 222 * Output: 223 * On success: returns zero if all specified locks were released; 224 * returns one if one or more locks were not released 225 * On error: return code is negative errno value 226 */ 227 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) 228 { 229 struct sockaddr_storage address; 230 struct sockaddr *sap = (struct sockaddr *)&address; 231 size_t salen = sizeof(address); 232 char *fo_path; 233 struct net *net = netns(file); 234 235 /* sanity check */ 236 if (size == 0) 237 return -EINVAL; 238 239 if (buf[size-1] != '\n') 240 return -EINVAL; 241 242 fo_path = buf; 243 if (qword_get(&buf, fo_path, size) < 0) 244 return -EINVAL; 245 246 if (rpc_pton(net, fo_path, size, sap, salen) == 0) 247 return -EINVAL; 248 249 trace_nfsd_ctl_unlock_ip(net, buf); 250 return nlmsvc_unlock_all_by_ip(sap); 251 } 252 253 /* 254 * write_unlock_fs - Release all locks on a local file system 255 * 256 * Experimental. 257 * 258 * Input: 259 * buf: '\n'-terminated C string containing the 260 * absolute pathname of a local file system 261 * size: length of C string in @buf 262 * Output: 263 * On success: returns zero if all specified locks were released; 264 * returns one if one or more locks were not released 265 * On error: return code is negative errno value 266 */ 267 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) 268 { 269 struct path path; 270 char *fo_path; 271 int error; 272 struct nfsd_net *nn; 273 274 /* sanity check */ 275 if (size == 0) 276 return -EINVAL; 277 278 if (buf[size-1] != '\n') 279 return -EINVAL; 280 281 fo_path = buf; 282 if (qword_get(&buf, fo_path, size) < 0) 283 return -EINVAL; 284 trace_nfsd_ctl_unlock_fs(netns(file), fo_path); 285 error = kern_path(fo_path, 0, &path); 286 if (error) 287 return error; 288 289 /* 290 * XXX: Needs better sanity checking. Otherwise we could end up 291 * releasing locks on the wrong file system. 292 * 293 * For example: 294 * 1. Does the path refer to a directory? 295 * 2. Is that directory a mount point, or 296 * 3. Is that directory the root of an exported file system? 297 */ 298 nfsd4_cancel_copy_by_sb(netns(file), path.dentry->d_sb); 299 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb); 300 mutex_lock(&nfsd_mutex); 301 nn = net_generic(netns(file), nfsd_net_id); 302 if (nn->nfsd_serv) 303 nfsd4_revoke_states(nn, path.dentry->d_sb); 304 else 305 error = -EINVAL; 306 mutex_unlock(&nfsd_mutex); 307 308 path_put(&path); 309 return error; 310 } 311 312 /* 313 * write_filehandle - Get a variable-length NFS file handle by path 314 * 315 * On input, the buffer contains a '\n'-terminated C string comprised of 316 * three alphanumeric words separated by whitespace. The string may 317 * contain escape sequences. 318 * 319 * Input: 320 * buf: 321 * domain: client domain name 322 * path: export pathname 323 * maxsize: numeric maximum size of 324 * @buf 325 * size: length of C string in @buf 326 * Output: 327 * On success: passed-in buffer filled with '\n'-terminated C 328 * string containing a ASCII hex text version 329 * of the NFS file handle; 330 * return code is the size in bytes of the string 331 * On error: return code is negative errno value 332 */ 333 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 334 { 335 char *dname, *path; 336 int maxsize; 337 char *mesg = buf; 338 int len; 339 struct auth_domain *dom; 340 struct knfsd_fh fh; 341 342 if (size == 0) 343 return -EINVAL; 344 345 if (buf[size-1] != '\n') 346 return -EINVAL; 347 buf[size-1] = 0; 348 349 dname = mesg; 350 len = qword_get(&mesg, dname, size); 351 if (len <= 0) 352 return -EINVAL; 353 354 path = dname+len+1; 355 len = qword_get(&mesg, path, size); 356 if (len <= 0) 357 return -EINVAL; 358 359 len = get_int(&mesg, &maxsize); 360 if (len) 361 return len; 362 363 if (maxsize < NFS_FHSIZE) 364 return -EINVAL; 365 maxsize = min(maxsize, NFS3_FHSIZE); 366 367 if (qword_get(&mesg, mesg, size) > 0) 368 return -EINVAL; 369 370 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize); 371 372 /* we have all the words, they are in buf.. */ 373 dom = unix_domain_find(dname); 374 if (!dom) 375 return -ENOMEM; 376 377 len = exp_rootfh(netns(file), dom, path, &fh, maxsize); 378 auth_domain_put(dom); 379 if (len) 380 return len; 381 382 mesg = buf; 383 len = SIMPLE_TRANSACTION_LIMIT; 384 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size); 385 mesg[-1] = '\n'; 386 return mesg - buf; 387 } 388 389 /* 390 * write_threads - Start NFSD, or report the configured number of threads 391 * 392 * Input: 393 * buf: ignored 394 * size: zero 395 * Output: 396 * On success: passed-in buffer filled with '\n'-terminated C 397 * string numeric value representing the configured 398 * number of NFSD threads; 399 * return code is the size in bytes of the string 400 * On error: return code is zero 401 * 402 * OR 403 * 404 * Input: 405 * buf: C string containing an unsigned 406 * integer value representing the 407 * number of NFSD threads to start 408 * size: non-zero length of C string in @buf 409 * Output: 410 * On success: NFS service is started; 411 * passed-in buffer filled with '\n'-terminated C 412 * string numeric value representing the configured 413 * number of NFSD threads; 414 * return code is the size in bytes of the string 415 * On error: return code is zero or a negative errno value 416 */ 417 static ssize_t write_threads(struct file *file, char *buf, size_t size) 418 { 419 char *mesg = buf; 420 int rv; 421 struct net *net = netns(file); 422 423 if (size > 0) { 424 int newthreads; 425 rv = get_int(&mesg, &newthreads); 426 if (rv) 427 return rv; 428 if (newthreads < 0) 429 return -EINVAL; 430 trace_nfsd_ctl_threads(net, newthreads); 431 mutex_lock(&nfsd_mutex); 432 rv = nfsd_svc(1, &newthreads, net, file->f_cred, NULL); 433 mutex_unlock(&nfsd_mutex); 434 if (rv < 0) 435 return rv; 436 } else 437 rv = nfsd_nrthreads(net); 438 439 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); 440 } 441 442 /* 443 * write_pool_threads - Set or report the configured number of threads per pool 444 * 445 * Input: 446 * buf: ignored 447 * size: zero 448 * 449 * OR 450 * 451 * Input: 452 * buf: C string containing whitespace- 453 * separated unsigned integer values 454 * representing the number of NFSD 455 * threads to start in each pool 456 * size: non-zero length of C string in @buf 457 * Output: 458 * On success: passed-in buffer filled with '\n'-terminated C 459 * string containing integer values representing the 460 * configured number of NFSD threads in each pool; 461 * return code is the size in bytes of the string 462 * On error: return code is zero or a negative errno value 463 */ 464 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) 465 { 466 /* if size > 0, look for an array of number of threads per node 467 * and apply them then write out number of threads per node as reply 468 */ 469 char *mesg = buf; 470 int i; 471 int rv; 472 int len; 473 int npools; 474 int *nthreads; 475 struct net *net = netns(file); 476 477 mutex_lock(&nfsd_mutex); 478 npools = nfsd_nrpools(net); 479 if (npools == 0) { 480 /* 481 * NFS is shut down. The admin can start it by 482 * writing to the threads file but NOT the pool_threads 483 * file, sorry. Report zero threads. 484 */ 485 mutex_unlock(&nfsd_mutex); 486 strcpy(buf, "0\n"); 487 return strlen(buf); 488 } 489 490 nthreads = kzalloc_objs(int, npools); 491 rv = -ENOMEM; 492 if (nthreads == NULL) 493 goto out_free; 494 495 if (size > 0) { 496 for (i = 0; i < npools; i++) { 497 rv = get_int(&mesg, &nthreads[i]); 498 if (rv == -ENOENT) 499 break; /* fewer numbers than pools */ 500 if (rv) 501 goto out_free; /* syntax error */ 502 rv = -EINVAL; 503 if (nthreads[i] < 0) 504 goto out_free; 505 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]); 506 } 507 508 /* 509 * There must always be a thread in pool 0; the admin 510 * can't shut down NFS completely using pool_threads. 511 */ 512 if (nthreads[0] == 0) 513 nthreads[0] = 1; 514 515 rv = nfsd_set_nrthreads(i, nthreads, net); 516 if (rv) 517 goto out_free; 518 } 519 520 rv = nfsd_get_nrthreads(npools, nthreads, net); 521 if (rv) 522 goto out_free; 523 524 mesg = buf; 525 size = SIMPLE_TRANSACTION_LIMIT; 526 for (i = 0; i < npools && size > 0; i++) { 527 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); 528 len = strlen(mesg); 529 size -= len; 530 mesg += len; 531 } 532 rv = mesg - buf; 533 out_free: 534 kfree(nthreads); 535 mutex_unlock(&nfsd_mutex); 536 return rv; 537 } 538 539 static ssize_t 540 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining, 541 const char *sep, unsigned vers, int minor) 542 { 543 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u"; 544 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST); 545 546 if (vers == 4 && minor >= 0 && 547 !nfsd_minorversion(nn, minor, NFSD_TEST)) 548 supported = false; 549 if (minor == 0 && supported) 550 /* 551 * special case for backward compatability. 552 * +4.0 is never reported, it is implied by 553 * +4, unless -4.0 is present. 554 */ 555 return 0; 556 return snprintf(buf, remaining, format, sep, 557 supported ? '+' : '-', vers, minor); 558 } 559 560 static ssize_t __write_versions(struct file *file, char *buf, size_t size) 561 { 562 char *mesg = buf; 563 char *vers, *minorp, sign; 564 int len, num, remaining; 565 ssize_t tlen = 0; 566 char *sep; 567 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 568 569 if (size > 0) { 570 if (nn->nfsd_serv) 571 /* Cannot change versions without updating 572 * nn->nfsd_serv->sv_xdrsize, and reallocing 573 * rq_argp and rq_resp 574 */ 575 return -EBUSY; 576 if (buf[size-1] != '\n') 577 return -EINVAL; 578 buf[size-1] = 0; 579 trace_nfsd_ctl_version(netns(file), buf); 580 581 vers = mesg; 582 len = qword_get(&mesg, vers, size); 583 if (len <= 0) return -EINVAL; 584 do { 585 enum vers_op cmd; 586 unsigned minor; 587 sign = *vers; 588 if (sign == '+' || sign == '-') 589 num = simple_strtol((vers+1), &minorp, 0); 590 else 591 num = simple_strtol(vers, &minorp, 0); 592 if (*minorp == '.') { 593 if (num != 4) 594 return -EINVAL; 595 if (kstrtouint(minorp+1, 0, &minor) < 0) 596 return -EINVAL; 597 } 598 599 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET; 600 switch(num) { 601 #ifdef CONFIG_NFSD_V2 602 case 2: 603 #endif 604 case 3: 605 nfsd_vers(nn, num, cmd); 606 break; 607 case 4: 608 if (*minorp == '.') { 609 if (nfsd_minorversion(nn, minor, cmd) < 0) 610 return -EINVAL; 611 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) { 612 /* 613 * Either we have +4 and no minors are enabled, 614 * or we have -4 and at least one minor is enabled. 615 * In either case, propagate 'cmd' to all minors. 616 */ 617 minor = 0; 618 while (nfsd_minorversion(nn, minor, cmd) >= 0) 619 minor++; 620 } 621 break; 622 default: 623 /* Ignore requests to disable non-existent versions */ 624 if (cmd == NFSD_SET) 625 return -EINVAL; 626 } 627 vers += len + 1; 628 } while ((len = qword_get(&mesg, vers, size)) > 0); 629 /* If all get turned off, turn them back on, as 630 * having no versions is BAD 631 */ 632 nfsd_reset_versions(nn); 633 } 634 635 /* Now write current state into reply buffer */ 636 sep = ""; 637 remaining = SIMPLE_TRANSACTION_LIMIT; 638 for (num=2 ; num <= 4 ; num++) { 639 int minor; 640 if (!nfsd_vers(nn, num, NFSD_AVAIL)) 641 continue; 642 643 minor = -1; 644 do { 645 len = nfsd_print_version_support(nn, buf, remaining, 646 sep, num, minor); 647 if (len >= remaining) 648 goto out; 649 remaining -= len; 650 buf += len; 651 tlen += len; 652 minor++; 653 if (len) 654 sep = " "; 655 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION); 656 } 657 out: 658 len = snprintf(buf, remaining, "\n"); 659 if (len >= remaining) 660 return -EINVAL; 661 return tlen + len; 662 } 663 664 /* 665 * write_versions - Set or report the available NFS protocol versions 666 * 667 * Input: 668 * buf: ignored 669 * size: zero 670 * Output: 671 * On success: passed-in buffer filled with '\n'-terminated C 672 * string containing positive or negative integer 673 * values representing the current status of each 674 * protocol version; 675 * return code is the size in bytes of the string 676 * On error: return code is zero or a negative errno value 677 * 678 * OR 679 * 680 * Input: 681 * buf: C string containing whitespace- 682 * separated positive or negative 683 * integer values representing NFS 684 * protocol versions to enable ("+n") 685 * or disable ("-n") 686 * size: non-zero length of C string in @buf 687 * Output: 688 * On success: status of zero or more protocol versions has 689 * been updated; passed-in buffer filled with 690 * '\n'-terminated C string containing positive 691 * or negative integer values representing the 692 * current status of each protocol version; 693 * return code is the size in bytes of the string 694 * On error: return code is zero or a negative errno value 695 */ 696 static ssize_t write_versions(struct file *file, char *buf, size_t size) 697 { 698 ssize_t rv; 699 700 mutex_lock(&nfsd_mutex); 701 rv = __write_versions(file, buf, size); 702 mutex_unlock(&nfsd_mutex); 703 return rv; 704 } 705 706 /* 707 * Zero-length write. Return a list of NFSD's current listener 708 * transports. 709 */ 710 static ssize_t __write_ports_names(char *buf, struct net *net) 711 { 712 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 713 714 if (nn->nfsd_serv == NULL) 715 return 0; 716 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); 717 } 718 719 /* 720 * A single 'fd' number was written, in which case it must be for 721 * a socket of a supported family/protocol, and we use it as an 722 * nfsd listener. 723 */ 724 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred) 725 { 726 char *mesg = buf; 727 int fd, err; 728 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 729 struct svc_serv *serv; 730 731 err = get_int(&mesg, &fd); 732 if (err != 0 || fd < 0) 733 return -EINVAL; 734 trace_nfsd_ctl_ports_addfd(net, fd); 735 736 err = nfsd_create_serv(net); 737 if (err != 0) 738 return err; 739 740 serv = nn->nfsd_serv; 741 err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred); 742 743 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks)) 744 nfsd_destroy_serv(net); 745 746 return err; 747 } 748 749 /* 750 * A transport listener is added by writing its transport name and 751 * a port number. 752 */ 753 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred) 754 { 755 char transport[16]; 756 struct svc_xprt *xprt; 757 int port, err; 758 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 759 struct svc_serv *serv; 760 761 if (sscanf(buf, "%15s %5u", transport, &port) != 2) 762 return -EINVAL; 763 764 if (port < 1 || port > USHRT_MAX) 765 return -EINVAL; 766 trace_nfsd_ctl_ports_addxprt(net, transport, port); 767 768 err = nfsd_create_serv(net); 769 if (err != 0) 770 return err; 771 772 serv = nn->nfsd_serv; 773 err = svc_xprt_create(serv, transport, net, 774 PF_INET, port, SVC_SOCK_ANONYMOUS, cred); 775 if (err < 0) 776 goto out_err; 777 778 err = svc_xprt_create(serv, transport, net, 779 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred); 780 if (err < 0 && err != -EAFNOSUPPORT) 781 goto out_close; 782 783 return 0; 784 out_close: 785 xprt = svc_find_xprt(serv, transport, net, PF_INET, port); 786 if (xprt != NULL) { 787 svc_xprt_close(xprt); 788 svc_xprt_put(xprt); 789 } 790 out_err: 791 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks)) 792 nfsd_destroy_serv(net); 793 794 return err; 795 } 796 797 static ssize_t __write_ports(struct file *file, char *buf, size_t size, 798 struct net *net) 799 { 800 if (size == 0) 801 return __write_ports_names(buf, net); 802 803 if (isdigit(buf[0])) 804 return __write_ports_addfd(buf, net, file->f_cred); 805 806 if (isalpha(buf[0])) 807 return __write_ports_addxprt(buf, net, file->f_cred); 808 809 return -EINVAL; 810 } 811 812 /* 813 * write_ports - Pass a socket file descriptor or transport name to listen on 814 * 815 * Input: 816 * buf: ignored 817 * size: zero 818 * Output: 819 * On success: passed-in buffer filled with a '\n'-terminated C 820 * string containing a whitespace-separated list of 821 * named NFSD listeners; 822 * return code is the size in bytes of the string 823 * On error: return code is zero or a negative errno value 824 * 825 * OR 826 * 827 * Input: 828 * buf: C string containing an unsigned 829 * integer value representing a bound 830 * but unconnected socket that is to be 831 * used as an NFSD listener; listen(3) 832 * must be called for a SOCK_STREAM 833 * socket, otherwise it is ignored 834 * size: non-zero length of C string in @buf 835 * Output: 836 * On success: NFS service is started; 837 * passed-in buffer filled with a '\n'-terminated C 838 * string containing a unique alphanumeric name of 839 * the listener; 840 * return code is the size in bytes of the string 841 * On error: return code is a negative errno value 842 * 843 * OR 844 * 845 * Input: 846 * buf: C string containing a transport 847 * name and an unsigned integer value 848 * representing the port to listen on, 849 * separated by whitespace 850 * size: non-zero length of C string in @buf 851 * Output: 852 * On success: returns zero; NFS service is started 853 * On error: return code is a negative errno value 854 */ 855 static ssize_t write_ports(struct file *file, char *buf, size_t size) 856 { 857 ssize_t rv; 858 859 mutex_lock(&nfsd_mutex); 860 rv = __write_ports(file, buf, size, netns(file)); 861 mutex_unlock(&nfsd_mutex); 862 return rv; 863 } 864 865 866 int nfsd_max_blksize; 867 868 /* 869 * write_maxblksize - Set or report the current NFS blksize 870 * 871 * Input: 872 * buf: ignored 873 * size: zero 874 * 875 * OR 876 * 877 * Input: 878 * buf: C string containing an unsigned 879 * integer value representing the new 880 * NFS blksize 881 * size: non-zero length of C string in @buf 882 * Output: 883 * On success: passed-in buffer filled with '\n'-terminated C string 884 * containing numeric value of the current NFS blksize 885 * setting; 886 * return code is the size in bytes of the string 887 * On error: return code is zero or a negative errno value 888 */ 889 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) 890 { 891 char *mesg = buf; 892 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 893 894 if (size > 0) { 895 int bsize; 896 int rv = get_int(&mesg, &bsize); 897 if (rv) 898 return rv; 899 trace_nfsd_ctl_maxblksize(netns(file), bsize); 900 901 /* force bsize into allowed range and 902 * required alignment. 903 */ 904 bsize = max_t(int, bsize, 1024); 905 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE); 906 bsize &= ~(1024-1); 907 mutex_lock(&nfsd_mutex); 908 if (nn->nfsd_serv) { 909 mutex_unlock(&nfsd_mutex); 910 return -EBUSY; 911 } 912 nfsd_max_blksize = bsize; 913 mutex_unlock(&nfsd_mutex); 914 } 915 916 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", 917 nfsd_max_blksize); 918 } 919 920 #ifdef CONFIG_NFSD_V4 921 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, 922 time64_t *time, struct nfsd_net *nn) 923 { 924 struct dentry *dentry = file_dentry(file); 925 char *mesg = buf; 926 int rv, i; 927 928 if (size > 0) { 929 if (nn->nfsd_serv) 930 return -EBUSY; 931 rv = get_int(&mesg, &i); 932 if (rv) 933 return rv; 934 trace_nfsd_ctl_time(netns(file), dentry->d_name.name, 935 dentry->d_name.len, i); 936 937 /* 938 * Some sanity checking. We don't have a reason for 939 * these particular numbers, but problems with the 940 * extremes are: 941 * - Too short: the briefest network outage may 942 * cause clients to lose all their locks. Also, 943 * the frequent polling may be wasteful. 944 * - Too long: do you really want reboot recovery 945 * to take more than an hour? Or to make other 946 * clients wait an hour before being able to 947 * revoke a dead client's locks? 948 */ 949 if (i < 10 || i > 3600) 950 return -EINVAL; 951 *time = i; 952 } 953 954 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time); 955 } 956 957 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, 958 time64_t *time, struct nfsd_net *nn) 959 { 960 ssize_t rv; 961 962 mutex_lock(&nfsd_mutex); 963 rv = __nfsd4_write_time(file, buf, size, time, nn); 964 mutex_unlock(&nfsd_mutex); 965 return rv; 966 } 967 968 /* 969 * write_leasetime - Set or report the current NFSv4 lease time 970 * 971 * Input: 972 * buf: ignored 973 * size: zero 974 * 975 * OR 976 * 977 * Input: 978 * buf: C string containing an unsigned 979 * integer value representing the new 980 * NFSv4 lease expiry time 981 * size: non-zero length of C string in @buf 982 * Output: 983 * On success: passed-in buffer filled with '\n'-terminated C 984 * string containing unsigned integer value of the 985 * current lease expiry time; 986 * return code is the size in bytes of the string 987 * On error: return code is zero or a negative errno value 988 */ 989 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 990 { 991 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 992 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); 993 } 994 995 /* 996 * write_gracetime - Set or report current NFSv4 grace period time 997 * 998 * As above, but sets the time of the NFSv4 grace period. 999 * 1000 * Note this should never be set to less than the *previous* 1001 * lease-period time, but we don't try to enforce this. (In the common 1002 * case (a new boot), we don't know what the previous lease time was 1003 * anyway.) 1004 */ 1005 static ssize_t write_gracetime(struct file *file, char *buf, size_t size) 1006 { 1007 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1008 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); 1009 } 1010 1011 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 1012 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, 1013 struct nfsd_net *nn) 1014 { 1015 char *mesg = buf; 1016 char *recdir; 1017 int len, status; 1018 1019 if (size > 0) { 1020 if (nn->nfsd_serv) 1021 return -EBUSY; 1022 if (size > PATH_MAX || buf[size-1] != '\n') 1023 return -EINVAL; 1024 buf[size-1] = 0; 1025 1026 recdir = mesg; 1027 len = qword_get(&mesg, recdir, size); 1028 if (len <= 0) 1029 return -EINVAL; 1030 trace_nfsd_ctl_recoverydir(netns(file), recdir); 1031 1032 status = nfs4_reset_recoverydir(recdir); 1033 if (status) 1034 return status; 1035 } 1036 1037 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", 1038 nfs4_recoverydir()); 1039 } 1040 1041 /* 1042 * write_recoverydir - Set or report the pathname of the recovery directory 1043 * 1044 * Input: 1045 * buf: ignored 1046 * size: zero 1047 * 1048 * OR 1049 * 1050 * Input: 1051 * buf: C string containing the pathname 1052 * of the directory on a local file 1053 * system containing permanent NFSv4 1054 * recovery data 1055 * size: non-zero length of C string in @buf 1056 * Output: 1057 * On success: passed-in buffer filled with '\n'-terminated C string 1058 * containing the current recovery pathname setting; 1059 * return code is the size in bytes of the string 1060 * On error: return code is zero or a negative errno value 1061 */ 1062 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 1063 { 1064 ssize_t rv; 1065 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1066 1067 mutex_lock(&nfsd_mutex); 1068 rv = __write_recoverydir(file, buf, size, nn); 1069 mutex_unlock(&nfsd_mutex); 1070 return rv; 1071 } 1072 #endif 1073 1074 /* 1075 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager 1076 * 1077 * Input: 1078 * buf: ignored 1079 * size: zero 1080 * OR 1081 * 1082 * Input: 1083 * buf: any value 1084 * size: non-zero length of C string in @buf 1085 * Output: 1086 * passed-in buffer filled with "Y" or "N" with a newline 1087 * and NULL-terminated C string. This indicates whether 1088 * the grace period has ended in the current net 1089 * namespace. Return code is the size in bytes of the 1090 * string. Writing a string that starts with 'Y', 'y', or 1091 * '1' to the file will end the grace period for nfsd's v4 1092 * lock manager. 1093 */ 1094 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) 1095 { 1096 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); 1097 1098 if (size > 0) { 1099 switch(buf[0]) { 1100 case 'Y': 1101 case 'y': 1102 case '1': 1103 if (!nfsd4_force_end_grace(nn)) 1104 return -EBUSY; 1105 trace_nfsd_end_grace(netns(file)); 1106 break; 1107 default: 1108 return -EINVAL; 1109 } 1110 } 1111 1112 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n", 1113 nn->grace_ended ? 'Y' : 'N'); 1114 } 1115 1116 #endif 1117 1118 /*----------------------------------------------------------------------------*/ 1119 /* 1120 * populating the filesystem. 1121 */ 1122 1123 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) 1124 { 1125 struct inode *inode = new_inode(sb); 1126 if (inode) { 1127 /* Following advice from simple_fill_super documentation: */ 1128 inode->i_ino = iunique(sb, NFSD_MaxReserved); 1129 inode->i_mode = mode; 1130 simple_inode_init_ts(inode); 1131 } 1132 return inode; 1133 } 1134 1135 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name) 1136 { 1137 struct inode *dir = parent->d_inode; 1138 struct dentry *dentry; 1139 struct inode *inode; 1140 1141 inode = nfsd_get_inode(parent->d_sb, S_IFDIR | 0600); 1142 if (!inode) 1143 return ERR_PTR(-ENOMEM); 1144 1145 dentry = simple_start_creating(parent, name); 1146 if (IS_ERR(dentry)) { 1147 iput(inode); 1148 return dentry; 1149 } 1150 inode->i_fop = &simple_dir_operations; 1151 inode->i_op = &simple_dir_inode_operations; 1152 inc_nlink(inode); 1153 if (ncl) { 1154 inode->i_private = ncl; 1155 kref_get(&ncl->cl_ref); 1156 } 1157 d_make_persistent(dentry, inode); 1158 inc_nlink(dir); 1159 fsnotify_mkdir(dir, dentry); 1160 simple_done_creating(dentry); 1161 return dentry; // borrowed 1162 } 1163 1164 #if IS_ENABLED(CONFIG_SUNRPC_GSS) 1165 /* 1166 * @content is assumed to be a NUL-terminated string that lives 1167 * longer than the symlink itself. 1168 */ 1169 static void _nfsd_symlink(struct dentry *parent, const char *name, 1170 const char *content) 1171 { 1172 struct inode *dir = parent->d_inode; 1173 struct inode *inode; 1174 struct dentry *dentry; 1175 1176 inode = nfsd_get_inode(dir->i_sb, S_IFLNK | 0777); 1177 if (!inode) 1178 return; 1179 1180 dentry = simple_start_creating(parent, name); 1181 if (IS_ERR(dentry)) { 1182 iput(inode); 1183 return; 1184 } 1185 1186 inode->i_op = &simple_symlink_inode_operations; 1187 inode->i_link = (char *)content; 1188 inode->i_size = strlen(content); 1189 1190 d_make_persistent(dentry, inode); 1191 fsnotify_create(dir, dentry); 1192 simple_done_creating(dentry); 1193 } 1194 #else 1195 static inline void _nfsd_symlink(struct dentry *parent, const char *name, 1196 const char *content) 1197 { 1198 } 1199 1200 #endif 1201 1202 static void clear_ncl(struct dentry *dentry) 1203 { 1204 struct inode *inode = d_inode(dentry); 1205 struct nfsdfs_client *ncl = inode->i_private; 1206 1207 spin_lock(&inode->i_lock); 1208 inode->i_private = NULL; 1209 spin_unlock(&inode->i_lock); 1210 kref_put(&ncl->cl_ref, ncl->cl_release); 1211 } 1212 1213 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode) 1214 { 1215 struct nfsdfs_client *nc; 1216 1217 spin_lock(&inode->i_lock); 1218 nc = inode->i_private; 1219 if (nc) 1220 kref_get(&nc->cl_ref); 1221 spin_unlock(&inode->i_lock); 1222 return nc; 1223 } 1224 1225 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share 1226 * code instead. */ 1227 static int nfsdfs_create_files(struct dentry *root, 1228 const struct tree_descr *files, 1229 struct nfsdfs_client *ncl, 1230 struct dentry **fdentries) 1231 { 1232 struct inode *dir = d_inode(root); 1233 struct dentry *dentry; 1234 1235 for (int i = 0; files->name && files->name[0]; i++, files++) { 1236 struct inode *inode = nfsd_get_inode(root->d_sb, 1237 S_IFREG | files->mode); 1238 if (!inode) 1239 return -ENOMEM; 1240 dentry = simple_start_creating(root, files->name); 1241 if (IS_ERR(dentry)) { 1242 iput(inode); 1243 return PTR_ERR(dentry); 1244 } 1245 kref_get(&ncl->cl_ref); 1246 inode->i_fop = files->ops; 1247 inode->i_private = ncl; 1248 d_make_persistent(dentry, inode); 1249 fsnotify_create(dir, dentry); 1250 if (fdentries) 1251 fdentries[i] = dentry; // borrowed 1252 simple_done_creating(dentry); 1253 } 1254 return 0; 1255 } 1256 1257 /* on success, returns positive number unique to that client. */ 1258 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, 1259 struct nfsdfs_client *ncl, u32 id, 1260 const struct tree_descr *files, 1261 struct dentry **fdentries) 1262 { 1263 struct dentry *dentry; 1264 char name[11]; 1265 int ret; 1266 1267 sprintf(name, "%u", id); 1268 1269 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name); 1270 if (IS_ERR(dentry)) /* XXX: tossing errors? */ 1271 return NULL; 1272 ret = nfsdfs_create_files(dentry, files, ncl, fdentries); 1273 if (ret) { 1274 nfsd_client_rmdir(dentry); 1275 return NULL; 1276 } 1277 return dentry; 1278 } 1279 1280 /* Taken from __rpc_rmdir: */ 1281 void nfsd_client_rmdir(struct dentry *dentry) 1282 { 1283 simple_recursive_removal(dentry, clear_ncl); 1284 } 1285 1286 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) 1287 { 1288 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, 1289 nfsd_net_id); 1290 struct dentry *dentry; 1291 int ret; 1292 1293 static const struct tree_descr nfsd_files[] = { 1294 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, 1295 /* Per-export io stats use same ops as exports file */ 1296 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO}, 1297 [NFSD_Export_features] = {"export_features", 1298 &export_features_fops, S_IRUGO}, 1299 [NFSD_FO_UnlockIP] = {"unlock_ip", 1300 &transaction_ops, S_IWUSR|S_IRUSR}, 1301 [NFSD_FO_UnlockFS] = {"unlock_filesystem", 1302 &transaction_ops, S_IWUSR|S_IRUSR}, 1303 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 1304 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1305 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, 1306 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, 1307 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", 1308 &nfsd_reply_cache_stats_fops, S_IRUGO}, 1309 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, 1310 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, 1311 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, 1312 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO}, 1313 #ifdef CONFIG_NFSD_V4 1314 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1315 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, 1316 #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 1317 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 1318 #endif 1319 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, 1320 #endif 1321 /* last one */ {""} 1322 }; 1323 1324 ret = simple_fill_super(sb, 0x6e667364, nfsd_files); 1325 if (ret) 1326 return ret; 1327 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes", 1328 "/proc/net/rpc/gss_krb5_enctypes"); 1329 dentry = nfsd_mkdir(sb->s_root, NULL, "clients"); 1330 if (IS_ERR(dentry)) 1331 return PTR_ERR(dentry); 1332 nn->nfsd_client_dir = dentry; 1333 return 0; 1334 } 1335 1336 static int nfsd_fs_get_tree(struct fs_context *fc) 1337 { 1338 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns)); 1339 } 1340 1341 static void nfsd_fs_free_fc(struct fs_context *fc) 1342 { 1343 if (fc->s_fs_info) 1344 put_net(fc->s_fs_info); 1345 } 1346 1347 static const struct fs_context_operations nfsd_fs_context_ops = { 1348 .free = nfsd_fs_free_fc, 1349 .get_tree = nfsd_fs_get_tree, 1350 }; 1351 1352 static int nfsd_init_fs_context(struct fs_context *fc) 1353 { 1354 put_user_ns(fc->user_ns); 1355 fc->user_ns = get_user_ns(fc->net_ns->user_ns); 1356 fc->ops = &nfsd_fs_context_ops; 1357 return 0; 1358 } 1359 1360 static void nfsd_umount(struct super_block *sb) 1361 { 1362 struct net *net = sb->s_fs_info; 1363 1364 nfsd_shutdown_threads(net); 1365 1366 kill_anon_super(sb); 1367 put_net(net); 1368 } 1369 1370 static struct file_system_type nfsd_fs_type = { 1371 .owner = THIS_MODULE, 1372 .name = "nfsd", 1373 .init_fs_context = nfsd_init_fs_context, 1374 .kill_sb = nfsd_umount, 1375 }; 1376 MODULE_ALIAS_FS("nfsd"); 1377 1378 #ifdef CONFIG_PROC_FS 1379 1380 static int exports_proc_open(struct inode *inode, struct file *file) 1381 { 1382 return exports_net_open(current->nsproxy->net_ns, file); 1383 } 1384 1385 static const struct proc_ops exports_proc_ops = { 1386 .proc_open = exports_proc_open, 1387 .proc_read = seq_read, 1388 .proc_lseek = seq_lseek, 1389 .proc_release = exports_release, 1390 }; 1391 1392 static int create_proc_exports_entry(void) 1393 { 1394 struct proc_dir_entry *entry; 1395 1396 entry = proc_mkdir("fs/nfs", NULL); 1397 if (!entry) 1398 return -ENOMEM; 1399 entry = proc_create("exports", 0, entry, &exports_proc_ops); 1400 if (!entry) { 1401 remove_proc_entry("fs/nfs", NULL); 1402 return -ENOMEM; 1403 } 1404 return 0; 1405 } 1406 #else /* CONFIG_PROC_FS */ 1407 static int create_proc_exports_entry(void) 1408 { 1409 return 0; 1410 } 1411 #endif 1412 1413 unsigned int nfsd_net_id; 1414 1415 static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb, 1416 struct netlink_callback *cb, 1417 struct nfsd_genl_rqstp *genl_rqstp) 1418 { 1419 void *hdr; 1420 u32 i; 1421 1422 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 1423 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET); 1424 if (!hdr) 1425 return -ENOBUFS; 1426 1427 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, genl_rqstp->rq_xid) || 1428 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, genl_rqstp->rq_flags) || 1429 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, genl_rqstp->rq_prog) || 1430 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, genl_rqstp->rq_proc) || 1431 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, genl_rqstp->rq_vers) || 1432 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME, 1433 ktime_to_us(genl_rqstp->rq_stime), 1434 NFSD_A_RPC_STATUS_PAD)) 1435 return -ENOBUFS; 1436 1437 switch (genl_rqstp->rq_saddr.sa_family) { 1438 case AF_INET: { 1439 const struct sockaddr_in *s_in, *d_in; 1440 1441 s_in = (const struct sockaddr_in *)&genl_rqstp->rq_saddr; 1442 d_in = (const struct sockaddr_in *)&genl_rqstp->rq_daddr; 1443 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4, 1444 s_in->sin_addr.s_addr) || 1445 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4, 1446 d_in->sin_addr.s_addr) || 1447 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT, 1448 s_in->sin_port) || 1449 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT, 1450 d_in->sin_port)) 1451 return -ENOBUFS; 1452 break; 1453 } 1454 case AF_INET6: { 1455 const struct sockaddr_in6 *s_in, *d_in; 1456 1457 s_in = (const struct sockaddr_in6 *)&genl_rqstp->rq_saddr; 1458 d_in = (const struct sockaddr_in6 *)&genl_rqstp->rq_daddr; 1459 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6, 1460 &s_in->sin6_addr) || 1461 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6, 1462 &d_in->sin6_addr) || 1463 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT, 1464 s_in->sin6_port) || 1465 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT, 1466 d_in->sin6_port)) 1467 return -ENOBUFS; 1468 break; 1469 } 1470 } 1471 1472 for (i = 0; i < genl_rqstp->rq_opcnt; i++) 1473 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS, 1474 genl_rqstp->rq_opnum[i])) 1475 return -ENOBUFS; 1476 1477 genlmsg_end(skb, hdr); 1478 return 0; 1479 } 1480 1481 /** 1482 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit 1483 * @skb: reply buffer 1484 * @cb: netlink metadata and command arguments 1485 * 1486 * Returns the size of the reply or a negative errno. 1487 */ 1488 int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb, 1489 struct netlink_callback *cb) 1490 { 1491 int i, ret, rqstp_index = 0; 1492 struct nfsd_net *nn; 1493 1494 mutex_lock(&nfsd_mutex); 1495 1496 nn = net_generic(sock_net(skb->sk), nfsd_net_id); 1497 if (!nn->nfsd_serv) { 1498 ret = -ENODEV; 1499 goto out_unlock; 1500 } 1501 1502 rcu_read_lock(); 1503 1504 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) { 1505 struct svc_rqst *rqstp; 1506 1507 if (i < cb->args[0]) /* already consumed */ 1508 continue; 1509 1510 rqstp_index = 0; 1511 list_for_each_entry_rcu(rqstp, 1512 &nn->nfsd_serv->sv_pools[i].sp_all_threads, 1513 rq_all) { 1514 struct nfsd_genl_rqstp genl_rqstp; 1515 unsigned int status_counter; 1516 1517 if (rqstp_index++ < cb->args[1]) /* already consumed */ 1518 continue; 1519 /* 1520 * Acquire rq_status_counter before parsing the rqst 1521 * fields. rq_status_counter is set to an odd value in 1522 * order to notify the consumers the rqstp fields are 1523 * meaningful. 1524 */ 1525 status_counter = 1526 smp_load_acquire(&rqstp->rq_status_counter); 1527 if (!(status_counter & 1)) 1528 continue; 1529 1530 genl_rqstp.rq_xid = rqstp->rq_xid; 1531 genl_rqstp.rq_flags = rqstp->rq_flags; 1532 genl_rqstp.rq_vers = rqstp->rq_vers; 1533 genl_rqstp.rq_prog = rqstp->rq_prog; 1534 genl_rqstp.rq_proc = rqstp->rq_proc; 1535 genl_rqstp.rq_stime = rqstp->rq_stime; 1536 genl_rqstp.rq_opcnt = 0; 1537 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp), 1538 sizeof(struct sockaddr)); 1539 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp), 1540 sizeof(struct sockaddr)); 1541 1542 #ifdef CONFIG_NFSD_V4 1543 if (rqstp->rq_vers == NFS4_VERSION && 1544 rqstp->rq_proc == NFSPROC4_COMPOUND) { 1545 /* NFSv4 compound */ 1546 struct nfsd4_compoundargs *args; 1547 int j; 1548 1549 args = rqstp->rq_argp; 1550 genl_rqstp.rq_opcnt = min_t(u32, args->opcnt, 1551 ARRAY_SIZE(genl_rqstp.rq_opnum)); 1552 for (j = 0; j < genl_rqstp.rq_opcnt; j++) 1553 genl_rqstp.rq_opnum[j] = 1554 args->ops[j].opnum; 1555 } 1556 #endif /* CONFIG_NFSD_V4 */ 1557 1558 /* 1559 * Acquire rq_status_counter before reporting the rqst 1560 * fields to the user. 1561 */ 1562 if (smp_load_acquire(&rqstp->rq_status_counter) != 1563 status_counter) 1564 continue; 1565 1566 ret = nfsd_genl_rpc_status_compose_msg(skb, cb, 1567 &genl_rqstp); 1568 if (ret) 1569 goto out; 1570 } 1571 } 1572 1573 cb->args[0] = i; 1574 cb->args[1] = rqstp_index; 1575 ret = skb->len; 1576 out: 1577 rcu_read_unlock(); 1578 out_unlock: 1579 mutex_unlock(&nfsd_mutex); 1580 1581 return ret; 1582 } 1583 1584 /** 1585 * nfsd_nl_threads_set_doit - set the number of running threads 1586 * @skb: reply buffer 1587 * @info: netlink metadata and command arguments 1588 * 1589 * Return 0 on success or a negative errno. 1590 */ 1591 int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info) 1592 { 1593 int *nthreads, nrpools = 0, i, ret = -EOPNOTSUPP, rem; 1594 struct net *net = genl_info_net(info); 1595 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1596 const struct nlattr *attr; 1597 const char *scope = NULL; 1598 1599 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_THREADS)) 1600 return -EINVAL; 1601 1602 /* count number of SERVER_THREADS values */ 1603 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_THREADS, info->nlhdr, 1604 GENL_HDRLEN, rem) 1605 nrpools++; 1606 1607 mutex_lock(&nfsd_mutex); 1608 1609 nthreads = kzalloc_objs(int, nrpools); 1610 if (!nthreads) { 1611 ret = -ENOMEM; 1612 goto out_unlock; 1613 } 1614 1615 i = 0; 1616 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_THREADS, info->nlhdr, 1617 GENL_HDRLEN, rem) { 1618 nthreads[i++] = nla_get_u32(attr); 1619 if (i >= nrpools) 1620 break; 1621 } 1622 1623 if (info->attrs[NFSD_A_SERVER_GRACETIME] || 1624 info->attrs[NFSD_A_SERVER_LEASETIME] || 1625 info->attrs[NFSD_A_SERVER_SCOPE]) { 1626 ret = -EBUSY; 1627 if (nn->nfsd_serv && nn->nfsd_serv->sv_nrthreads) 1628 goto out_unlock; 1629 1630 ret = -EINVAL; 1631 attr = info->attrs[NFSD_A_SERVER_GRACETIME]; 1632 if (attr) { 1633 u32 gracetime = nla_get_u32(attr); 1634 1635 if (gracetime < 10 || gracetime > 3600) 1636 goto out_unlock; 1637 1638 nn->nfsd4_grace = gracetime; 1639 } 1640 1641 attr = info->attrs[NFSD_A_SERVER_LEASETIME]; 1642 if (attr) { 1643 u32 leasetime = nla_get_u32(attr); 1644 1645 if (leasetime < 10 || leasetime > 3600) 1646 goto out_unlock; 1647 1648 nn->nfsd4_lease = leasetime; 1649 } 1650 1651 attr = info->attrs[NFSD_A_SERVER_SCOPE]; 1652 if (attr) 1653 scope = nla_data(attr); 1654 } 1655 1656 attr = info->attrs[NFSD_A_SERVER_MIN_THREADS]; 1657 if (attr) 1658 nn->min_threads = nla_get_u32(attr); 1659 1660 ret = nfsd_svc(nrpools, nthreads, net, current_cred(), scope); 1661 if (ret > 0) 1662 ret = 0; 1663 out_unlock: 1664 mutex_unlock(&nfsd_mutex); 1665 kfree(nthreads); 1666 return ret; 1667 } 1668 1669 /** 1670 * nfsd_nl_threads_get_doit - get the maximum number of running threads 1671 * @skb: reply buffer 1672 * @info: netlink metadata and command arguments 1673 * 1674 * Return 0 on success or a negative errno. 1675 */ 1676 int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info) 1677 { 1678 struct net *net = genl_info_net(info); 1679 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1680 void *hdr; 1681 int err; 1682 1683 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 1684 if (!skb) 1685 return -ENOMEM; 1686 1687 hdr = genlmsg_iput(skb, info); 1688 if (!hdr) { 1689 err = -EMSGSIZE; 1690 goto err_free_msg; 1691 } 1692 1693 mutex_lock(&nfsd_mutex); 1694 1695 err = nla_put_u32(skb, NFSD_A_SERVER_GRACETIME, 1696 nn->nfsd4_grace) || 1697 nla_put_u32(skb, NFSD_A_SERVER_LEASETIME, 1698 nn->nfsd4_lease) || 1699 nla_put_u32(skb, NFSD_A_SERVER_MIN_THREADS, 1700 nn->min_threads) || 1701 nla_put_string(skb, NFSD_A_SERVER_SCOPE, 1702 nn->nfsd_name); 1703 if (err) 1704 goto err_unlock; 1705 1706 if (nn->nfsd_serv) { 1707 int i; 1708 1709 for (i = 0; i < nfsd_nrpools(net); ++i) { 1710 struct svc_pool *sp = &nn->nfsd_serv->sv_pools[i]; 1711 1712 err = nla_put_u32(skb, NFSD_A_SERVER_THREADS, 1713 sp->sp_nrthrmax); 1714 if (err) 1715 goto err_unlock; 1716 } 1717 } else { 1718 err = nla_put_u32(skb, NFSD_A_SERVER_THREADS, 0); 1719 if (err) 1720 goto err_unlock; 1721 } 1722 1723 mutex_unlock(&nfsd_mutex); 1724 1725 genlmsg_end(skb, hdr); 1726 1727 return genlmsg_reply(skb, info); 1728 1729 err_unlock: 1730 mutex_unlock(&nfsd_mutex); 1731 err_free_msg: 1732 nlmsg_free(skb); 1733 1734 return err; 1735 } 1736 1737 /** 1738 * nfsd_nl_version_set_doit - set the nfs enabled versions 1739 * @skb: reply buffer 1740 * @info: netlink metadata and command arguments 1741 * 1742 * Return 0 on success or a negative errno. 1743 */ 1744 int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info) 1745 { 1746 const struct nlattr *attr; 1747 struct nfsd_net *nn; 1748 int i, rem; 1749 1750 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_PROTO_VERSION)) 1751 return -EINVAL; 1752 1753 mutex_lock(&nfsd_mutex); 1754 1755 nn = net_generic(genl_info_net(info), nfsd_net_id); 1756 if (nn->nfsd_serv) { 1757 mutex_unlock(&nfsd_mutex); 1758 return -EBUSY; 1759 } 1760 1761 /* clear current supported versions. */ 1762 nfsd_vers(nn, 2, NFSD_CLEAR); 1763 nfsd_vers(nn, 3, NFSD_CLEAR); 1764 for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) 1765 nfsd_minorversion(nn, i, NFSD_CLEAR); 1766 1767 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_PROTO_VERSION, info->nlhdr, 1768 GENL_HDRLEN, rem) { 1769 struct nlattr *tb[NFSD_A_VERSION_MAX + 1]; 1770 u32 major, minor = 0; 1771 bool enabled; 1772 1773 if (nla_parse_nested(tb, NFSD_A_VERSION_MAX, attr, 1774 nfsd_version_nl_policy, info->extack) < 0) 1775 continue; 1776 1777 if (!tb[NFSD_A_VERSION_MAJOR]) 1778 continue; 1779 1780 major = nla_get_u32(tb[NFSD_A_VERSION_MAJOR]); 1781 if (tb[NFSD_A_VERSION_MINOR]) 1782 minor = nla_get_u32(tb[NFSD_A_VERSION_MINOR]); 1783 1784 enabled = nla_get_flag(tb[NFSD_A_VERSION_ENABLED]); 1785 1786 switch (major) { 1787 case 4: 1788 nfsd_minorversion(nn, minor, enabled ? NFSD_SET : NFSD_CLEAR); 1789 break; 1790 case 3: 1791 case 2: 1792 if (!minor) 1793 nfsd_vers(nn, major, enabled ? NFSD_SET : NFSD_CLEAR); 1794 break; 1795 default: 1796 break; 1797 } 1798 } 1799 1800 mutex_unlock(&nfsd_mutex); 1801 1802 return 0; 1803 } 1804 1805 /** 1806 * nfsd_nl_version_get_doit - get the enabled status for all supported nfs versions 1807 * @skb: reply buffer 1808 * @info: netlink metadata and command arguments 1809 * 1810 * Return 0 on success or a negative errno. 1811 */ 1812 int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info) 1813 { 1814 struct nfsd_net *nn; 1815 int i, err; 1816 void *hdr; 1817 1818 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 1819 if (!skb) 1820 return -ENOMEM; 1821 1822 hdr = genlmsg_iput(skb, info); 1823 if (!hdr) { 1824 err = -EMSGSIZE; 1825 goto err_free_msg; 1826 } 1827 1828 mutex_lock(&nfsd_mutex); 1829 nn = net_generic(genl_info_net(info), nfsd_net_id); 1830 1831 for (i = 2; i <= 4; i++) { 1832 int j; 1833 1834 for (j = 0; j <= NFSD_SUPPORTED_MINOR_VERSION; j++) { 1835 struct nlattr *attr; 1836 1837 /* Don't record any versions the kernel doesn't have 1838 * compiled in 1839 */ 1840 if (!nfsd_support_version(i)) 1841 continue; 1842 1843 /* NFSv{2,3} does not support minor numbers */ 1844 if (i < 4 && j) 1845 continue; 1846 1847 attr = nla_nest_start(skb, 1848 NFSD_A_SERVER_PROTO_VERSION); 1849 if (!attr) { 1850 err = -EINVAL; 1851 goto err_nfsd_unlock; 1852 } 1853 1854 if (nla_put_u32(skb, NFSD_A_VERSION_MAJOR, i) || 1855 nla_put_u32(skb, NFSD_A_VERSION_MINOR, j)) { 1856 err = -EINVAL; 1857 goto err_nfsd_unlock; 1858 } 1859 1860 /* Set the enabled flag if the version is enabled */ 1861 if (nfsd_vers(nn, i, NFSD_TEST) && 1862 (i < 4 || nfsd_minorversion(nn, j, NFSD_TEST)) && 1863 nla_put_flag(skb, NFSD_A_VERSION_ENABLED)) { 1864 err = -EINVAL; 1865 goto err_nfsd_unlock; 1866 } 1867 1868 nla_nest_end(skb, attr); 1869 } 1870 } 1871 1872 mutex_unlock(&nfsd_mutex); 1873 genlmsg_end(skb, hdr); 1874 1875 return genlmsg_reply(skb, info); 1876 1877 err_nfsd_unlock: 1878 mutex_unlock(&nfsd_mutex); 1879 err_free_msg: 1880 nlmsg_free(skb); 1881 1882 return err; 1883 } 1884 1885 /** 1886 * nfsd_nl_listener_set_doit - set the nfs running sockets 1887 * @skb: reply buffer 1888 * @info: netlink metadata and command arguments 1889 * 1890 * Return 0 on success or a negative errno. 1891 */ 1892 int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info) 1893 { 1894 struct net *net = genl_info_net(info); 1895 struct svc_xprt *xprt, *tmp; 1896 const struct nlattr *attr; 1897 struct svc_serv *serv; 1898 LIST_HEAD(permsocks); 1899 struct nfsd_net *nn; 1900 bool delete = false; 1901 int err, rem; 1902 1903 mutex_lock(&nfsd_mutex); 1904 1905 err = nfsd_create_serv(net); 1906 if (err) { 1907 mutex_unlock(&nfsd_mutex); 1908 return err; 1909 } 1910 1911 nn = net_generic(net, nfsd_net_id); 1912 serv = nn->nfsd_serv; 1913 1914 spin_lock_bh(&serv->sv_lock); 1915 1916 /* Move all of the old listener sockets to a temp list */ 1917 list_splice_init(&serv->sv_permsocks, &permsocks); 1918 1919 /* 1920 * Walk the list of server_socks from userland and move any that match 1921 * back to sv_permsocks 1922 */ 1923 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_SOCK_ADDR, info->nlhdr, 1924 GENL_HDRLEN, rem) { 1925 struct nlattr *tb[NFSD_A_SOCK_MAX + 1]; 1926 const char *xcl_name; 1927 struct sockaddr *sa; 1928 1929 if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr, 1930 nfsd_sock_nl_policy, info->extack) < 0) 1931 continue; 1932 1933 if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME]) 1934 continue; 1935 1936 if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa)) 1937 continue; 1938 1939 xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]); 1940 sa = nla_data(tb[NFSD_A_SOCK_ADDR]); 1941 1942 /* Put back any matching sockets */ 1943 list_for_each_entry_safe(xprt, tmp, &permsocks, xpt_list) { 1944 /* This shouldn't be possible */ 1945 if (WARN_ON_ONCE(xprt->xpt_net != net)) { 1946 list_move(&xprt->xpt_list, &serv->sv_permsocks); 1947 continue; 1948 } 1949 1950 /* If everything matches, put it back */ 1951 if (!strcmp(xprt->xpt_class->xcl_name, xcl_name) && 1952 rpc_cmp_addr_port(sa, (struct sockaddr *)&xprt->xpt_local)) { 1953 list_move(&xprt->xpt_list, &serv->sv_permsocks); 1954 break; 1955 } 1956 } 1957 } 1958 1959 /* 1960 * If there are listener transports remaining on the permsocks list, 1961 * it means we were asked to remove a listener. 1962 */ 1963 if (!list_empty(&permsocks)) { 1964 list_splice_init(&permsocks, &serv->sv_permsocks); 1965 delete = true; 1966 } 1967 spin_unlock_bh(&serv->sv_lock); 1968 1969 /* Do not remove listeners while there are active threads. */ 1970 if (serv->sv_nrthreads) { 1971 err = -EBUSY; 1972 goto out_unlock_mtx; 1973 } 1974 1975 /* 1976 * Since we can't delete an arbitrary llist entry, destroy the 1977 * remaining listeners and recreate the list. 1978 */ 1979 if (delete) 1980 svc_xprt_destroy_all(serv, net, false); 1981 1982 /* walk list of addrs again, open any that still don't exist */ 1983 nlmsg_for_each_attr_type(attr, NFSD_A_SERVER_SOCK_ADDR, info->nlhdr, 1984 GENL_HDRLEN, rem) { 1985 struct nlattr *tb[NFSD_A_SOCK_MAX + 1]; 1986 const char *xcl_name; 1987 struct sockaddr *sa; 1988 int ret; 1989 1990 if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr, 1991 nfsd_sock_nl_policy, info->extack) < 0) 1992 continue; 1993 1994 if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME]) 1995 continue; 1996 1997 if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa)) 1998 continue; 1999 2000 xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]); 2001 sa = nla_data(tb[NFSD_A_SOCK_ADDR]); 2002 2003 xprt = svc_find_listener(serv, xcl_name, net, sa); 2004 if (xprt) { 2005 if (delete) 2006 WARN_ONCE(1, "Transport type=%s already exists\n", 2007 xcl_name); 2008 svc_xprt_put(xprt); 2009 continue; 2010 } 2011 2012 ret = svc_xprt_create_from_sa(serv, xcl_name, net, sa, 0, 2013 current_cred()); 2014 /* always save the latest error */ 2015 if (ret < 0) 2016 err = ret; 2017 } 2018 2019 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks)) 2020 nfsd_destroy_serv(net); 2021 2022 out_unlock_mtx: 2023 mutex_unlock(&nfsd_mutex); 2024 2025 return err; 2026 } 2027 2028 /** 2029 * nfsd_nl_listener_get_doit - get the nfs running listeners 2030 * @skb: reply buffer 2031 * @info: netlink metadata and command arguments 2032 * 2033 * Return 0 on success or a negative errno. 2034 */ 2035 int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info) 2036 { 2037 struct svc_xprt *xprt; 2038 struct svc_serv *serv; 2039 struct nfsd_net *nn; 2040 void *hdr; 2041 int err; 2042 2043 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 2044 if (!skb) 2045 return -ENOMEM; 2046 2047 hdr = genlmsg_iput(skb, info); 2048 if (!hdr) { 2049 err = -EMSGSIZE; 2050 goto err_free_msg; 2051 } 2052 2053 mutex_lock(&nfsd_mutex); 2054 nn = net_generic(genl_info_net(info), nfsd_net_id); 2055 2056 /* no nfs server? Just send empty socket list */ 2057 if (!nn->nfsd_serv) 2058 goto out_unlock_mtx; 2059 2060 serv = nn->nfsd_serv; 2061 spin_lock_bh(&serv->sv_lock); 2062 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { 2063 struct nlattr *attr; 2064 2065 attr = nla_nest_start(skb, NFSD_A_SERVER_SOCK_ADDR); 2066 if (!attr) { 2067 err = -EINVAL; 2068 goto err_serv_unlock; 2069 } 2070 2071 if (nla_put_string(skb, NFSD_A_SOCK_TRANSPORT_NAME, 2072 xprt->xpt_class->xcl_name) || 2073 nla_put(skb, NFSD_A_SOCK_ADDR, 2074 sizeof(struct sockaddr_storage), 2075 &xprt->xpt_local)) { 2076 err = -EINVAL; 2077 goto err_serv_unlock; 2078 } 2079 2080 nla_nest_end(skb, attr); 2081 } 2082 spin_unlock_bh(&serv->sv_lock); 2083 out_unlock_mtx: 2084 mutex_unlock(&nfsd_mutex); 2085 genlmsg_end(skb, hdr); 2086 2087 return genlmsg_reply(skb, info); 2088 2089 err_serv_unlock: 2090 spin_unlock_bh(&serv->sv_lock); 2091 mutex_unlock(&nfsd_mutex); 2092 err_free_msg: 2093 nlmsg_free(skb); 2094 2095 return err; 2096 } 2097 2098 /** 2099 * nfsd_nl_pool_mode_set_doit - set the number of running threads 2100 * @skb: reply buffer 2101 * @info: netlink metadata and command arguments 2102 * 2103 * Return 0 on success or a negative errno. 2104 */ 2105 int nfsd_nl_pool_mode_set_doit(struct sk_buff *skb, struct genl_info *info) 2106 { 2107 const struct nlattr *attr; 2108 2109 if (GENL_REQ_ATTR_CHECK(info, NFSD_A_POOL_MODE_MODE)) 2110 return -EINVAL; 2111 2112 attr = info->attrs[NFSD_A_POOL_MODE_MODE]; 2113 return sunrpc_set_pool_mode(nla_data(attr)); 2114 } 2115 2116 /** 2117 * nfsd_nl_pool_mode_get_doit - get info about pool_mode 2118 * @skb: reply buffer 2119 * @info: netlink metadata and command arguments 2120 * 2121 * Return 0 on success or a negative errno. 2122 */ 2123 int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info) 2124 { 2125 struct net *net = genl_info_net(info); 2126 char buf[16]; 2127 void *hdr; 2128 int err; 2129 2130 if (sunrpc_get_pool_mode(buf, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf)) 2131 return -ERANGE; 2132 2133 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 2134 if (!skb) 2135 return -ENOMEM; 2136 2137 err = -EMSGSIZE; 2138 hdr = genlmsg_iput(skb, info); 2139 if (!hdr) 2140 goto err_free_msg; 2141 2142 err = nla_put_string(skb, NFSD_A_POOL_MODE_MODE, buf) | 2143 nla_put_u32(skb, NFSD_A_POOL_MODE_NPOOLS, nfsd_nrpools(net)); 2144 if (err) 2145 goto err_free_msg; 2146 2147 genlmsg_end(skb, hdr); 2148 return genlmsg_reply(skb, info); 2149 2150 err_free_msg: 2151 nlmsg_free(skb); 2152 return err; 2153 } 2154 2155 /** 2156 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace 2157 * @net: a freshly-created network namespace 2158 * 2159 * This information stays around as long as the network namespace is 2160 * alive whether or not there is an NFSD instance running in the 2161 * namespace. 2162 * 2163 * Returns zero on success, or a negative errno otherwise. 2164 */ 2165 static __net_init int nfsd_net_init(struct net *net) 2166 { 2167 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2168 int retval; 2169 int i; 2170 2171 retval = nfsd_export_init(net); 2172 if (retval) 2173 goto out_export_error; 2174 retval = nfsd_idmap_init(net); 2175 if (retval) 2176 goto out_idmap_error; 2177 retval = percpu_counter_init_many(nn->counter, 0, GFP_KERNEL, 2178 NFSD_STATS_COUNTERS_NUM); 2179 if (retval) 2180 goto out_repcache_error; 2181 2182 memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats)); 2183 nn->nfsd_svcstats.program = &nfsd_programs[0]; 2184 if (!nfsd_proc_stat_init(net)) { 2185 retval = -ENOMEM; 2186 goto out_proc_error; 2187 } 2188 2189 for (i = 0; i < sizeof(nn->nfsd_versions); i++) 2190 nn->nfsd_versions[i] = nfsd_support_version(i); 2191 for (i = 0; i < sizeof(nn->nfsd4_minorversions); i++) 2192 nn->nfsd4_minorversions[i] = nfsd_support_version(4); 2193 nn->nfsd_info.mutex = &nfsd_mutex; 2194 nn->nfsd_serv = NULL; 2195 nfsd4_init_leases_net(nn); 2196 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key)); 2197 seqlock_init(&nn->writeverf_lock); 2198 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 2199 spin_lock_init(&nn->local_clients_lock); 2200 INIT_LIST_HEAD(&nn->local_clients); 2201 #endif 2202 return 0; 2203 2204 out_proc_error: 2205 percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM); 2206 out_repcache_error: 2207 nfsd_idmap_shutdown(net); 2208 out_idmap_error: 2209 nfsd_export_shutdown(net); 2210 out_export_error: 2211 return retval; 2212 } 2213 2214 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 2215 /** 2216 * nfsd_net_pre_exit - Disconnect localio clients from net namespace 2217 * @net: a network namespace that is about to be destroyed 2218 * 2219 * This invalidates ->net pointers held by localio clients 2220 * while they can still safely access nn->counter. 2221 */ 2222 static __net_exit void nfsd_net_pre_exit(struct net *net) 2223 { 2224 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2225 2226 nfs_localio_invalidate_clients(&nn->local_clients, 2227 &nn->local_clients_lock); 2228 } 2229 #endif 2230 2231 /** 2232 * nfsd_net_exit - Release the nfsd_net portion of a net namespace 2233 * @net: a network namespace that is about to be destroyed 2234 * 2235 */ 2236 static __net_exit void nfsd_net_exit(struct net *net) 2237 { 2238 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2239 2240 nfsd_proc_stat_shutdown(net); 2241 percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM); 2242 nfsd_idmap_shutdown(net); 2243 nfsd_export_shutdown(net); 2244 } 2245 2246 static struct pernet_operations nfsd_net_ops = { 2247 .init = nfsd_net_init, 2248 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 2249 .pre_exit = nfsd_net_pre_exit, 2250 #endif 2251 .exit = nfsd_net_exit, 2252 .id = &nfsd_net_id, 2253 .size = sizeof(struct nfsd_net), 2254 }; 2255 2256 static int __init init_nfsd(void) 2257 { 2258 int retval; 2259 2260 nfsd_debugfs_init(); 2261 2262 retval = nfsd4_init_slabs(); 2263 if (retval) 2264 return retval; 2265 retval = nfsd4_init_pnfs(); 2266 if (retval) 2267 goto out_free_slabs; 2268 retval = nfsd_drc_slab_create(); 2269 if (retval) 2270 goto out_free_pnfs; 2271 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 2272 retval = nfsd_export_wq_init(); 2273 if (retval) 2274 goto out_free_lockd; 2275 retval = register_pernet_subsys(&nfsd_net_ops); 2276 if (retval < 0) 2277 goto out_free_export_wq; 2278 retval = register_cld_notifier(); 2279 if (retval) 2280 goto out_free_subsys; 2281 retval = nfsd4_create_laundry_wq(); 2282 if (retval) 2283 goto out_free_cld; 2284 retval = register_filesystem(&nfsd_fs_type); 2285 if (retval) 2286 goto out_free_nfsd4; 2287 retval = genl_register_family(&nfsd_nl_family); 2288 if (retval) 2289 goto out_free_filesystem; 2290 retval = create_proc_exports_entry(); 2291 if (retval) 2292 goto out_free_all; 2293 nfsd_localio_ops_init(); 2294 2295 return 0; 2296 out_free_all: 2297 genl_unregister_family(&nfsd_nl_family); 2298 out_free_filesystem: 2299 unregister_filesystem(&nfsd_fs_type); 2300 out_free_nfsd4: 2301 nfsd4_destroy_laundry_wq(); 2302 out_free_cld: 2303 unregister_cld_notifier(); 2304 out_free_subsys: 2305 unregister_pernet_subsys(&nfsd_net_ops); 2306 out_free_export_wq: 2307 nfsd_export_wq_shutdown(); 2308 out_free_lockd: 2309 nfsd_lockd_shutdown(); 2310 nfsd_drc_slab_free(); 2311 out_free_pnfs: 2312 nfsd4_exit_pnfs(); 2313 out_free_slabs: 2314 nfsd4_free_slabs(); 2315 nfsd_debugfs_exit(); 2316 return retval; 2317 } 2318 2319 static void __exit exit_nfsd(void) 2320 { 2321 remove_proc_entry("fs/nfs/exports", NULL); 2322 remove_proc_entry("fs/nfs", NULL); 2323 genl_unregister_family(&nfsd_nl_family); 2324 unregister_filesystem(&nfsd_fs_type); 2325 nfsd4_destroy_laundry_wq(); 2326 unregister_cld_notifier(); 2327 unregister_pernet_subsys(&nfsd_net_ops); 2328 nfsd_export_wq_shutdown(); 2329 nfsd_drc_slab_free(); 2330 nfsd_lockd_shutdown(); 2331 nfsd4_free_slabs(); 2332 nfsd4_exit_pnfs(); 2333 nfsd_debugfs_exit(); 2334 } 2335 2336 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2337 MODULE_DESCRIPTION("In-kernel NFS server"); 2338 MODULE_LICENSE("GPL"); 2339 module_init(init_nfsd) 2340 module_exit(exit_nfsd) 2341