nfs_export.c revision 1.28
1 /* $NetBSD: nfs_export.c,v 1.28 2007/06/09 02:33:41 dyoung Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 2004, 2005 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by Charles M. Hannum. 12 * This code is derived from software contributed to The NetBSD Foundation 13 * by Julio M. Merino Vidal. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the NetBSD 26 * Foundation, Inc. and its contributors. 27 * 4. Neither the name of The NetBSD Foundation nor the names of its 28 * contributors may be used to endorse or promote products derived 29 * from this software without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 32 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 33 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 34 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 35 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 36 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 37 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 38 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 39 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGE. 42 */ 43 44 /* 45 * Copyright (c) 1989, 1993 46 * The Regents of the University of California. All rights reserved. 47 * (c) UNIX System Laboratories, Inc. 48 * All or some portions of this file are derived from material licensed 49 * to the University of California by American Telephone and Telegraph 50 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 51 * the permission of UNIX System Laboratories, Inc. 52 * 53 * Redistribution and use in source and binary forms, with or without 54 * modification, are permitted provided that the following conditions 55 * are met: 56 * 1. Redistributions of source code must retain the above copyright 57 * notice, this list of conditions and the following disclaimer. 58 * 2. Redistributions in binary form must reproduce the above copyright 59 * notice, this list of conditions and the following disclaimer in the 60 * documentation and/or other materials provided with the distribution. 61 * 3. Neither the name of the University nor the names of its contributors 62 * may be used to endorse or promote products derived from this software 63 * without specific prior written permission. 64 * 65 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 66 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 67 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 68 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 69 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 70 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 72 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 73 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 75 * SUCH DAMAGE. 76 * 77 * @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94 78 */ 79 80 /* 81 * VFS exports list management. 82 */ 83 84 #include <sys/cdefs.h> 85 __KERNEL_RCSID(0, "$NetBSD: nfs_export.c,v 1.28 2007/06/09 02:33:41 dyoung Exp $"); 86 87 #include "opt_compat_netbsd.h" 88 #include "opt_inet.h" 89 90 #include <sys/param.h> 91 #include <sys/systm.h> 92 #include <sys/queue.h> 93 #include <sys/proc.h> 94 #include <sys/mount.h> 95 #include <sys/vnode.h> 96 #include <sys/namei.h> 97 #include <sys/errno.h> 98 #include <sys/malloc.h> 99 #include <sys/domain.h> 100 #include <sys/mbuf.h> 101 #include <sys/dirent.h> 102 #include <sys/socket.h> /* XXX for AF_MAX */ 103 #include <sys/kauth.h> 104 105 #include <net/radix.h> 106 107 #include <netinet/in.h> 108 109 #include <nfs/rpcv2.h> 110 #include <nfs/nfsproto.h> 111 #include <nfs/nfs.h> 112 #include <nfs/nfs_var.h> 113 114 /* 115 * Network address lookup element. 116 */ 117 struct netcred { 118 struct radix_node netc_rnodes[2]; 119 int netc_refcnt; 120 int netc_exflags; 121 kauth_cred_t netc_anon; 122 }; 123 124 /* 125 * Network export information. 126 */ 127 struct netexport { 128 CIRCLEQ_ENTRY(netexport) ne_list; 129 struct mount *ne_mount; 130 struct netcred ne_defexported; /* Default export */ 131 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */ 132 }; 133 CIRCLEQ_HEAD(, netexport) netexport_list = 134 CIRCLEQ_HEAD_INITIALIZER(netexport_list); 135 136 /* Malloc type used by the mount<->netexport map. */ 137 MALLOC_DEFINE(M_NFS_EXPORT, "nfs_export", "NFS export data"); 138 139 /* Publicly exported file system. */ 140 struct nfs_public nfs_pub; 141 142 /* 143 * Local prototypes. 144 */ 145 static int init_exports(struct mount *, struct netexport **); 146 static int hang_addrlist(struct mount *, struct netexport *, 147 const struct export_args *); 148 static int sacheck(struct sockaddr *); 149 static int free_netcred(struct radix_node *, void *); 150 static int export(struct netexport *, const struct export_args *); 151 static int setpublicfs(struct mount *, struct netexport *, 152 const struct export_args *); 153 static struct netcred *netcred_lookup(struct netexport *, struct mbuf *); 154 static struct netexport *netexport_lookup(const struct mount *); 155 static struct netexport *netexport_lookup_byfsid(const fsid_t *); 156 static void netexport_clear(struct netexport *); 157 static void netexport_insert(struct netexport *); 158 static void netexport_remove(struct netexport *); 159 static void netexport_wrlock(void); 160 static void netexport_wrunlock(void); 161 162 /* 163 * PUBLIC INTERFACE 164 */ 165 166 /* 167 * Declare and initialize the file system export hooks. 168 */ 169 static void nfs_export_unmount(struct mount *); 170 171 struct vfs_hooks nfs_export_hooks = { 172 nfs_export_unmount 173 }; 174 VFS_HOOKS_ATTACH(nfs_export_hooks); 175 176 /* 177 * VFS unmount hook for NFS exports. 178 * 179 * Releases NFS exports list resources if the given mount point has some. 180 * As allocation happens lazily, it may be that it doesn't has this 181 * information, although it theorically should. 182 */ 183 static void 184 nfs_export_unmount(struct mount *mp) 185 { 186 struct netexport *ne; 187 188 KASSERT(mp != NULL); 189 190 netexport_wrlock(); 191 ne = netexport_lookup(mp); 192 if (ne == NULL) { 193 netexport_wrunlock(); 194 return; 195 } 196 netexport_clear(ne); 197 netexport_remove(ne); 198 netexport_wrunlock(); 199 free(ne, M_NFS_EXPORT); 200 } 201 202 /* 203 * Atomically set the NFS exports list of the given file system, replacing 204 * it with a new list of entries. 205 * 206 * Returns zero on success or an appropriate error code otherwise. 207 * 208 * Helper function for the nfssvc(2) system call (NFSSVC_SETEXPORTSLIST 209 * command). 210 */ 211 int 212 mountd_set_exports_list(const struct mountd_exports_list *mel, struct lwp *l) 213 { 214 int error; 215 #ifdef notyet 216 /* XXX: See below to see the reason why this is disabled. */ 217 size_t i; 218 #endif 219 struct mount *mp; 220 struct netexport *ne; 221 struct nameidata nd; 222 struct vnode *vp; 223 struct fid *fid; 224 size_t fid_size; 225 226 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 227 NULL) != 0) 228 return EPERM; 229 230 /* Lookup the file system path. */ 231 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, mel->mel_path, l); 232 error = namei(&nd); 233 if (error != 0) 234 return error; 235 vp = nd.ni_vp; 236 mp = vp->v_mount; 237 238 fid_size = 0; 239 if ((error = VFS_VPTOFH(vp, NULL, &fid_size)) == E2BIG) { 240 fid = malloc(fid_size, M_TEMP, M_NOWAIT); 241 if (fid != NULL) { 242 error = VFS_VPTOFH(vp, fid, &fid_size); 243 free(fid, M_TEMP); 244 } 245 } 246 if (error != 0) { 247 vput(vp); 248 return EOPNOTSUPP; 249 } 250 251 /* Mark the file system busy. */ 252 error = vfs_busy(mp, LK_NOWAIT, NULL); 253 vput(vp); 254 if (error != 0) 255 return error; 256 257 netexport_wrlock(); 258 ne = netexport_lookup(mp); 259 if (ne == NULL) { 260 error = init_exports(mp, &ne); 261 if (error != 0) { 262 goto out; 263 } 264 } 265 266 KASSERT(ne != NULL); 267 KASSERT(ne->ne_mount == mp); 268 269 /* 270 * XXX: The part marked as 'notyet' works fine from the kernel's 271 * point of view, in the sense that it is able to atomically update 272 * the complete exports list for a file system. However, supporting 273 * this in mountd(8) requires a lot of work; so, for now, keep the 274 * old behavior of updating a single entry per call. 275 * 276 * When mountd(8) is fixed, just remove the second branch of this 277 * preprocessor conditional and enable the first one. 278 */ 279 #ifdef notyet 280 netexport_clear(ne); 281 for (i = 0; error == 0 && i < mel->mel_nexports; i++) 282 error = export(ne, &mel->mel_exports[i]); 283 #else 284 if (mel->mel_nexports == 0) 285 netexport_clear(ne); 286 else if (mel->mel_nexports == 1) 287 error = export(ne, &mel->mel_exports[0]); 288 else { 289 printf("mountd_set_exports_list: Cannot set more than one " 290 "entry at once (unimplemented)\n"); 291 error = EOPNOTSUPP; 292 } 293 #endif 294 295 out: 296 netexport_wrunlock(); 297 vfs_unbusy(mp); 298 return error; 299 } 300 301 static void 302 netexport_insert(struct netexport *ne) 303 { 304 305 CIRCLEQ_INSERT_HEAD(&netexport_list, ne, ne_list); 306 } 307 308 static void 309 netexport_remove(struct netexport *ne) 310 { 311 312 CIRCLEQ_REMOVE(&netexport_list, ne, ne_list); 313 } 314 315 static struct netexport * 316 netexport_lookup(const struct mount *mp) 317 { 318 struct netexport *ne; 319 320 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 321 if (ne->ne_mount == mp) { 322 goto done; 323 } 324 } 325 ne = NULL; 326 done: 327 return ne; 328 } 329 330 static struct netexport * 331 netexport_lookup_byfsid(const fsid_t *fsid) 332 { 333 struct netexport *ne; 334 335 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 336 const struct mount *mp = ne->ne_mount; 337 338 if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] && 339 mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) { 340 goto done; 341 } 342 } 343 ne = NULL; 344 done: 345 346 return ne; 347 } 348 349 /* 350 * Check if the file system specified by the 'mp' mount structure is 351 * exported to a client with 'anon' anonymous credentials. The 'mb' 352 * argument is an mbuf containing the network address of the client. 353 * The return parameters for the export flags for the client are returned 354 * in the address specified by 'wh'. 355 * 356 * This function is used exclusively by the NFS server. It is generally 357 * invoked before VFS_FHTOVP to validate that client has access to the 358 * file system. 359 */ 360 361 int 362 netexport_check(const fsid_t *fsid, struct mbuf *mb, struct mount **mpp, 363 int *wh, kauth_cred_t *anon) 364 { 365 struct netexport *ne; 366 struct netcred *np; 367 368 ne = netexport_lookup_byfsid(fsid); 369 if (ne == NULL) { 370 return EACCES; 371 } 372 np = netcred_lookup(ne, mb); 373 if (np == NULL) { 374 return EACCES; 375 } 376 377 *mpp = ne->ne_mount; 378 *wh = np->netc_exflags; 379 *anon = np->netc_anon; 380 381 return 0; 382 } 383 384 #ifdef COMPAT_30 385 /* 386 * Handles legacy export requests. In this case, the export information 387 * is hardcoded in a specific place of the mount arguments structure (given 388 * in data); the request for an update is given through the fspec field 389 * (also in a known location), which must be a null pointer. 390 * 391 * Returns EJUSTRETURN if the given command was not a export request. 392 * Otherwise, returns 0 on success or an appropriate error code otherwise. 393 */ 394 int 395 nfs_update_exports_30(struct mount *mp, const char *path, void *data, 396 struct lwp *l) 397 { 398 int error; 399 struct { 400 const char *fspec; 401 struct export_args30 eargs; 402 } args; 403 struct mountd_exports_list mel; 404 405 mel.mel_path = path; 406 407 error = copyin(data, &args, sizeof(args)); 408 if (error != 0) 409 return EJUSTRETURN; 410 411 if (args.fspec != NULL) 412 return EJUSTRETURN; 413 414 if (args.eargs.ex_flags & 0x00020000) { 415 /* Request to delete exports. The mask above holds the 416 * value that used to be in MNT_DELEXPORT. */ 417 mel.mel_nexports = 0; 418 } else { 419 struct export_args eargs; 420 421 /* The following assumes export_args has not changed since 422 * export_args30. */ 423 memcpy(&eargs, &args.eargs, sizeof(struct export_args)); 424 425 mel.mel_nexports = 1; 426 mel.mel_exports = &eargs; 427 } 428 429 return mountd_set_exports_list(&mel, l); 430 } 431 #endif 432 433 /* 434 * INTERNAL FUNCTIONS 435 */ 436 437 /* 438 * Initializes NFS exports for the file system given in 'mp' if it supports 439 * file handles; this is determined by checking whether mp's vfs_vptofh and 440 * vfs_fhtovp operations are NULL or not. 441 * 442 * If successful, returns 0 and sets *mnpp to the address of the new 443 * mount_netexport_pair item; otherwise returns an appropriate error code 444 * and *mnpp remains unmodified. 445 */ 446 static int 447 init_exports(struct mount *mp, struct netexport **nep) 448 { 449 int error; 450 struct export_args ea; 451 struct netexport *ne; 452 453 KASSERT(mp != NULL); 454 455 /* Ensure that we do not already have this mount point. */ 456 KASSERT(netexport_lookup(mp) == NULL); 457 458 ne = malloc(sizeof(*ne), M_NFS_EXPORT, M_WAITOK | M_ZERO); 459 ne->ne_mount = mp; 460 461 /* Set the default export entry. Handled internally by export upon 462 * first call. */ 463 memset(&ea, 0, sizeof(ea)); 464 ea.ex_root = -2; 465 if (mp->mnt_flag & MNT_RDONLY) 466 ea.ex_flags |= MNT_EXRDONLY; 467 error = export(ne, &ea); 468 if (error != 0) { 469 free(ne, M_NFS_EXPORT); 470 } else { 471 netexport_insert(ne); 472 *nep = ne; 473 } 474 475 return error; 476 } 477 478 /* 479 * Build hash lists of net addresses and hang them off the mount point. 480 * Called by export() to set up a new entry in the lists of export 481 * addresses. 482 */ 483 static int 484 hang_addrlist(struct mount *mp, struct netexport *nep, 485 const struct export_args *argp) 486 { 487 int error, i; 488 struct netcred *np, *enp; 489 struct radix_node_head *rnh; 490 struct sockaddr *saddr, *smask; 491 struct domain *dom; 492 493 smask = NULL; 494 495 if (argp->ex_addrlen == 0) { 496 if (mp->mnt_flag & MNT_DEFEXPORTED) 497 return EPERM; 498 np = &nep->ne_defexported; 499 KASSERT(np->netc_anon == NULL); 500 np->netc_anon = kauth_cred_alloc(); 501 np->netc_exflags = argp->ex_flags; 502 kauth_uucred_to_cred(np->netc_anon, &argp->ex_anon); 503 mp->mnt_flag |= MNT_DEFEXPORTED; 504 return 0; 505 } 506 507 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN) 508 return EINVAL; 509 510 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 511 np = malloc(i, M_NETADDR, M_WAITOK | M_ZERO); 512 np->netc_anon = kauth_cred_alloc(); 513 saddr = (struct sockaddr *)(np + 1); 514 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 515 if (error) 516 goto out; 517 if (saddr->sa_len > argp->ex_addrlen) 518 saddr->sa_len = argp->ex_addrlen; 519 if (sacheck(saddr) == -1) 520 return EINVAL; 521 if (argp->ex_masklen) { 522 smask = (struct sockaddr *)((char *)saddr + argp->ex_addrlen); 523 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 524 if (error) 525 goto out; 526 if (smask->sa_len > argp->ex_masklen) 527 smask->sa_len = argp->ex_masklen; 528 if (smask->sa_family != saddr->sa_family) 529 return EINVAL; 530 if (sacheck(smask) == -1) 531 return EINVAL; 532 } 533 i = saddr->sa_family; 534 if ((rnh = nep->ne_rtable[i]) == 0) { 535 /* 536 * Seems silly to initialize every AF when most are not 537 * used, do so on demand here 538 */ 539 DOMAIN_FOREACH(dom) { 540 if (dom->dom_family == i && dom->dom_rtattach) { 541 dom->dom_rtattach((void **)&nep->ne_rtable[i], 542 dom->dom_rtoffset); 543 break; 544 } 545 } 546 if ((rnh = nep->ne_rtable[i]) == 0) { 547 error = ENOBUFS; 548 goto out; 549 } 550 } 551 552 enp = (struct netcred *)(*rnh->rnh_addaddr)(saddr, smask, rnh, 553 np->netc_rnodes); 554 if (enp != np) { 555 if (enp == NULL) { 556 enp = (struct netcred *)(*rnh->rnh_lookup)(saddr, 557 smask, rnh); 558 if (enp == NULL) { 559 error = EPERM; 560 goto out; 561 } 562 } else 563 enp->netc_refcnt++; 564 565 goto check; 566 } else 567 enp->netc_refcnt = 1; 568 569 np->netc_exflags = argp->ex_flags; 570 kauth_uucred_to_cred(np->netc_anon, &argp->ex_anon); 571 return 0; 572 check: 573 if (enp->netc_exflags != argp->ex_flags || 574 kauth_cred_uucmp(enp->netc_anon, &argp->ex_anon) != 0) 575 error = EPERM; 576 else 577 error = 0; 578 out: 579 KASSERT(np->netc_anon != NULL); 580 kauth_cred_free(np->netc_anon); 581 free(np, M_NETADDR); 582 return error; 583 } 584 585 /* 586 * Ensure that the address stored in 'sa' is valid. 587 * Returns zero on success, otherwise -1. 588 */ 589 static int 590 sacheck(struct sockaddr *sa) 591 { 592 593 switch (sa->sa_family) { 594 #ifdef INET 595 case AF_INET: { 596 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 597 char *p = (char *)sin->sin_zero; 598 size_t i; 599 600 if (sin->sin_len != sizeof(*sin)) 601 return -1; 602 if (sin->sin_port != 0) 603 return -1; 604 for (i = 0; i < sizeof(sin->sin_zero); i++) 605 if (*p++ != '\0') 606 return -1; 607 return 0; 608 } 609 #endif 610 #ifdef INET6 611 case AF_INET6: { 612 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 613 614 if (sin6->sin6_len != sizeof(*sin6)) 615 return -1; 616 if (sin6->sin6_port != 0) 617 return -1; 618 return 0; 619 } 620 #endif 621 default: 622 return -1; 623 } 624 } 625 626 /* 627 * Free the netcred object pointed to by the 'rn' radix node. 628 * 'w' holds a pointer to the radix tree head. 629 */ 630 static int 631 free_netcred(struct radix_node *rn, void *w) 632 { 633 struct radix_node_head *rnh = (struct radix_node_head *)w; 634 struct netcred *np = (struct netcred *)(void *)rn; 635 636 (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh); 637 if (--(np->netc_refcnt) <= 0) { 638 KASSERT(np->netc_anon != NULL); 639 kauth_cred_free(np->netc_anon); 640 free(np, M_NETADDR); 641 } 642 return 0; 643 } 644 645 /* 646 * Clears the exports list for a given file system. 647 */ 648 static void 649 netexport_clear(struct netexport *ne) 650 { 651 struct radix_node_head *rnh; 652 struct mount *mp = ne->ne_mount; 653 int i; 654 655 if (mp->mnt_flag & MNT_EXPUBLIC) { 656 setpublicfs(NULL, NULL, NULL); 657 mp->mnt_flag &= ~MNT_EXPUBLIC; 658 } 659 660 for (i = 0; i <= AF_MAX; i++) { 661 if ((rnh = ne->ne_rtable[i]) != NULL) { 662 rn_walktree(rnh, free_netcred, rnh); 663 free(rnh, M_RTABLE); 664 ne->ne_rtable[i] = NULL; 665 } 666 } 667 668 if ((mp->mnt_flag & MNT_DEFEXPORTED) != 0) { 669 struct netcred *np = &ne->ne_defexported; 670 671 KASSERT(np->netc_anon != NULL); 672 kauth_cred_free(np->netc_anon); 673 np->netc_anon = NULL; 674 } else { 675 KASSERT(ne->ne_defexported.netc_anon == NULL); 676 } 677 678 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 679 } 680 681 /* 682 * Add a new export entry (described by an export_args structure) to the 683 * given file system. 684 */ 685 static int 686 export(struct netexport *nep, const struct export_args *argp) 687 { 688 struct mount *mp = nep->ne_mount; 689 int error; 690 691 if (argp->ex_flags & MNT_EXPORTED) { 692 if (argp->ex_flags & MNT_EXPUBLIC) { 693 if ((error = setpublicfs(mp, nep, argp)) != 0) 694 return error; 695 mp->mnt_flag |= MNT_EXPUBLIC; 696 } 697 if ((error = hang_addrlist(mp, nep, argp)) != 0) 698 return error; 699 mp->mnt_flag |= MNT_EXPORTED; 700 } 701 return 0; 702 } 703 704 /* 705 * Set the publicly exported filesystem (WebNFS). Currently, only 706 * one public filesystem is possible in the spec (RFC 2054 and 2055) 707 */ 708 static int 709 setpublicfs(struct mount *mp, struct netexport *nep, 710 const struct export_args *argp) 711 { 712 char *cp; 713 int error; 714 struct vnode *rvp; 715 size_t fhsize; 716 717 /* 718 * mp == NULL -> invalidate the current info, the FS is 719 * no longer exported. May be called from either export 720 * or unmount, so check if it hasn't already been done. 721 */ 722 if (mp == NULL) { 723 if (nfs_pub.np_valid) { 724 nfs_pub.np_valid = 0; 725 if (nfs_pub.np_handle != NULL) { 726 free(nfs_pub.np_handle, M_TEMP); 727 nfs_pub.np_handle = NULL; 728 } 729 if (nfs_pub.np_index != NULL) { 730 FREE(nfs_pub.np_index, M_TEMP); 731 nfs_pub.np_index = NULL; 732 } 733 } 734 return 0; 735 } 736 737 /* 738 * Only one allowed at a time. 739 */ 740 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 741 return EBUSY; 742 743 /* 744 * Get real filehandle for root of exported FS. 745 */ 746 if ((error = VFS_ROOT(mp, &rvp))) 747 return error; 748 749 fhsize = 0; 750 error = vfs_composefh(rvp, NULL, &fhsize); 751 if (error != E2BIG) 752 return error; 753 nfs_pub.np_handle = malloc(fhsize, M_TEMP, M_NOWAIT); 754 if (nfs_pub.np_handle == NULL) 755 error = ENOMEM; 756 else 757 error = vfs_composefh(rvp, nfs_pub.np_handle, &fhsize); 758 if (error) 759 return error; 760 761 vput(rvp); 762 763 /* 764 * If an indexfile was specified, pull it in. 765 */ 766 if (argp->ex_indexfile != NULL) { 767 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 768 M_WAITOK); 769 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 770 MAXNAMLEN, (size_t *)0); 771 if (!error) { 772 /* 773 * Check for illegal filenames. 774 */ 775 for (cp = nfs_pub.np_index; *cp; cp++) { 776 if (*cp == '/') { 777 error = EINVAL; 778 break; 779 } 780 } 781 } 782 if (error) { 783 FREE(nfs_pub.np_index, M_TEMP); 784 return error; 785 } 786 } 787 788 nfs_pub.np_mount = mp; 789 nfs_pub.np_valid = 1; 790 return 0; 791 } 792 793 /* 794 * Lookup an export entry in the exports list that matches the address 795 * stored in 'nam'. If no entry is found, the default one is used instead 796 * (if available). 797 */ 798 static struct netcred * 799 netcred_lookup(struct netexport *ne, struct mbuf *nam) 800 { 801 struct netcred *np; 802 struct radix_node_head *rnh; 803 struct sockaddr *saddr; 804 805 if ((ne->ne_mount->mnt_flag & MNT_EXPORTED) == 0) { 806 return NULL; 807 } 808 809 /* 810 * Lookup in the export list first. 811 */ 812 np = NULL; 813 if (nam != NULL) { 814 saddr = mtod(nam, struct sockaddr *); 815 rnh = ne->ne_rtable[saddr->sa_family]; 816 if (rnh != NULL) { 817 np = (struct netcred *) 818 (*rnh->rnh_matchaddr)((void *)saddr, 819 rnh); 820 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 821 np = NULL; 822 } 823 } 824 /* 825 * If no address match, use the default if it exists. 826 */ 827 if (np == NULL && ne->ne_mount->mnt_flag & MNT_DEFEXPORTED) 828 np = &ne->ne_defexported; 829 830 return np; 831 } 832 833 static struct lock netexport_lock = LOCK_INITIALIZER(PVFS, "netexp", 0, 0); 834 835 void 836 netexport_rdlock(void) 837 { 838 839 lockmgr(&netexport_lock, LK_SHARED, NULL); 840 } 841 842 void 843 netexport_rdunlock(void) 844 { 845 846 lockmgr(&netexport_lock, LK_RELEASE, NULL); 847 } 848 849 static void 850 netexport_wrlock(void) 851 { 852 853 lockmgr(&netexport_lock, LK_EXCLUSIVE, NULL); 854 } 855 856 static void 857 netexport_wrunlock(void) 858 { 859 860 lockmgr(&netexport_lock, LK_RELEASE, NULL); 861 } 862
Indexes created Mon Sep 22 05:09:51 GMT 2025