nfs_export.c revision 1.8
1 /* $NetBSD: nfs_export.c,v 1.8 2006/01/05 11:22:56 yamt 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 1.8 2006/01/05 11:22:56 yamt 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 */ 103 104 #include <net/radix.h> 105 106 #include <netinet/in.h> 107 108 #include <nfs/rpcv2.h> 109 #include <nfs/nfsproto.h> 110 #include <nfs/nfs.h> 111 #include <nfs/nfs_var.h> 112 113 /* 114 * Network address lookup element. 115 */ 116 struct netcred { 117 struct radix_node netc_rnodes[2]; 118 int netc_refcnt; 119 int netc_exflags; 120 struct ucred netc_anon; 121 }; 122 123 /* 124 * Network export information. 125 */ 126 struct netexport { 127 CIRCLEQ_ENTRY(netexport) ne_list; 128 struct mount *ne_mount; 129 struct netcred ne_defexported; /* Default export */ 130 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */ 131 }; 132 CIRCLEQ_HEAD(, netexport) netexport_list = 133 CIRCLEQ_HEAD_INITIALIZER(netexport_list); 134 135 /* Malloc type used by the mount<->netexport map. */ 136 MALLOC_DEFINE(M_NFS_EXPORT, "nfs_export", "NFS export data"); 137 138 /* Publicly exported file system. */ 139 struct nfs_public nfs_pub; 140 141 /* 142 * Local prototypes. 143 */ 144 static int init_exports(struct mount *, struct netexport **); 145 static int hang_addrlist(struct mount *, struct netexport *, 146 const struct export_args *); 147 static int sacheck(struct sockaddr *); 148 static int free_netcred(struct radix_node *, void *); 149 static void clear_exports(struct netexport *); 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_insert(struct netexport *); 157 static void netexport_remove(struct netexport *); 158 static void netexport_wrlock(void); 159 static void netexport_wrunlock(void); 160 161 /* 162 * PUBLIC INTERFACE 163 */ 164 165 /* 166 * Declare and initialize the file system export hooks. 167 */ 168 static void nfs_export_unmount(struct mount *); 169 170 struct vfs_hooks nfs_export_hooks = { 171 nfs_export_unmount 172 }; 173 VFS_HOOKS_ATTACH(nfs_export_hooks); 174 175 /* 176 * VFS unmount hook for NFS exports. 177 * 178 * Releases NFS exports list resources if the given mount point has some. 179 * As allocation happens lazily, it may be that it doesn't has this 180 * information, although it theorically should. 181 */ 182 static void 183 nfs_export_unmount(struct mount *mp) 184 { 185 struct netexport *ne; 186 187 KASSERT(mp != NULL); 188 189 netexport_wrlock(); 190 ne = netexport_lookup(mp); 191 if (ne == NULL) { 192 netexport_wrunlock(); 193 return; 194 } 195 196 KASSERT(mp->mnt_op->vfs_vptofh != NULL && 197 mp->mnt_op->vfs_fhtovp != NULL); 198 199 if (mp->mnt_flag & MNT_EXPUBLIC) { 200 setpublicfs(NULL, NULL, NULL); 201 } 202 203 netexport_remove(ne); 204 netexport_wrunlock(); 205 free(ne, M_NFS_EXPORT); 206 } 207 208 /* 209 * Atomically set the NFS exports list of the given file system, replacing 210 * it with a new list of entries. 211 * 212 * Returns zero on success or an appropriate error code otherwise. 213 * 214 * Helper function for the nfssvc(2) system call (NFSSVC_SETEXPORTSLIST 215 * command). 216 */ 217 int 218 mountd_set_exports_list(const struct mountd_exports_list *mel, struct lwp *l) 219 { 220 int error; 221 #ifdef notyet 222 /* XXX: See below to see the reason why this is disabled. */ 223 size_t i; 224 #endif 225 struct mount *mp; 226 struct netexport *ne; 227 struct nameidata nd; 228 struct vnode *vp; 229 230 if (suser(l->l_proc->p_ucred, &l->l_proc->p_acflag) != 0) 231 return EPERM; 232 233 /* Lookup the file system path. */ 234 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, mel->mel_path, l); 235 error = namei(&nd); 236 if (error != 0) 237 return error; 238 vp = nd.ni_vp; 239 mp = vp->v_mount; 240 241 /* The selected file system may not support NFS exports, so ensure 242 * it does. */ 243 if (mp->mnt_op->vfs_vptofh == NULL && mp->mnt_op->vfs_fhtovp == NULL) { 244 error = EOPNOTSUPP; 245 goto out_locked; 246 } 247 KASSERT(mp->mnt_op->vfs_vptofh != NULL && 248 mp->mnt_op->vfs_fhtovp != NULL); 249 250 /* Mark the file system busy. */ 251 error = vfs_busy(mp, LK_NOWAIT, NULL); 252 if (error != 0) 253 goto out_locked; 254 255 netexport_wrlock(); 256 ne = netexport_lookup(mp); 257 if (ne == NULL) { 258 error = init_exports(mp, &ne); 259 if (error != 0) { 260 goto out_locked2; 261 } 262 } 263 264 KASSERT(ne != NULL); 265 KASSERT(ne->ne_mount == mp); 266 267 /* 268 * XXX: The part marked as 'notyet' works fine from the kernel's 269 * point of view, in the sense that it is able to atomically update 270 * the complete exports list for a file system. However, supporting 271 * this in mountd(8) requires a lot of work; so, for now, keep the 272 * old behavior of updating a single entry per call. 273 * 274 * When mountd(8) is fixed, just remove the second branch of this 275 * preprocessor conditional and enable the first one. 276 */ 277 #ifdef notyet 278 clear_exports(ne); 279 for (i = 0; error == 0 && i < mel->mel_nexports; i++) 280 error = export(ne, &mel->mel_exports[i]); 281 #else 282 if (mel->mel_nexports == 0) 283 clear_exports(ne); 284 else if (mel->mel_nexports == 1) 285 error = export(ne, &mel->mel_exports[0]); 286 else { 287 printf("mountd_set_exports_list: Cannot set more than one " 288 "entry at once (unimplemented)\n"); 289 error = EOPNOTSUPP; 290 } 291 #endif 292 293 out_locked2: 294 netexport_wrunlock(); 295 vfs_unbusy(mp); 296 297 out_locked: 298 vput(vp); 299 300 return error; 301 } 302 303 static void 304 netexport_insert(struct netexport *ne) 305 { 306 307 CIRCLEQ_INSERT_HEAD(&netexport_list, ne, ne_list); 308 } 309 310 static void 311 netexport_remove(struct netexport *ne) 312 { 313 314 CIRCLEQ_REMOVE(&netexport_list, ne, ne_list); 315 } 316 317 static struct netexport * 318 netexport_lookup(const struct mount *mp) 319 { 320 struct netexport *ne; 321 322 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 323 if (ne->ne_mount == mp) { 324 goto done; 325 } 326 } 327 ne = NULL; 328 done: 329 return ne; 330 } 331 332 static struct netexport * 333 netexport_lookup_byfsid(const fsid_t *fsid) 334 { 335 struct netexport *ne; 336 337 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 338 const struct mount *mp = ne->ne_mount; 339 340 if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] && 341 mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) { 342 goto done; 343 } 344 } 345 ne = NULL; 346 done: 347 348 return ne; 349 } 350 351 /* 352 * Check if the file system specified by the 'mp' mount structure is 353 * exported to a client with 'anon' anonymous credentials. The 'mb' 354 * argument is an mbuf containing the network address of the client. 355 * The return parameters for the export flags for the client are returned 356 * in the address specified by 'wh'. 357 * 358 * This function is used exclusively by the NFS server. It is generally 359 * invoked before VFS_FHTOVP to validate that client has access to the 360 * file system. 361 */ 362 363 int 364 netexport_check(const fsid_t *fsid, struct mbuf *mb, struct mount **mpp, 365 int *wh, struct ucred **anon) 366 { 367 struct netexport *ne; 368 struct netcred *np; 369 370 ne = netexport_lookup_byfsid(fsid); 371 if (ne == NULL) { 372 return EACCES; 373 } 374 np = netcred_lookup(ne, mb); 375 if (np == NULL) { 376 return EACCES; 377 } 378 379 *mpp = ne->ne_mount; 380 *wh = np->netc_exflags; 381 *anon = &np->netc_anon; 382 383 return 0; 384 } 385 386 #ifdef COMPAT_30 387 /* 388 * Handles legacy export requests. In this case, the export information 389 * is hardcoded in a specific place of the mount arguments structure (given 390 * in data); the request for an update is given through the fspec field 391 * (also in a known location), which must be a null pointer. 392 * 393 * Returns EJUSTRETURN if the given command was not a export request. 394 * Otherwise, returns 0 on success or an appropriate error code otherwise. 395 */ 396 int 397 nfs_update_exports_30(struct mount *mp, const char *path, void *data, 398 struct lwp *l) 399 { 400 int error; 401 struct { 402 const char *fspec; 403 struct export_args30 eargs; 404 } args; 405 struct mountd_exports_list mel; 406 407 mel.mel_path = path; 408 409 error = copyin(data, &args, sizeof(args)); 410 if (error != 0) 411 return EJUSTRETURN; 412 413 if (args.fspec != NULL) 414 return EJUSTRETURN; 415 416 if (args.eargs.ex_flags & 0x00020000) { 417 /* Request to delete exports. The mask above holds the 418 * value that used to be in MNT_DELEXPORT. */ 419 mel.mel_nexports = 0; 420 } else { 421 struct export_args eargs; 422 423 /* The following assumes export_args has not changed since 424 * export_args30. */ 425 memcpy(&eargs, &args.eargs, sizeof(struct export_args)); 426 427 mel.mel_nexports = 1; 428 mel.mel_exports = &eargs; 429 } 430 431 return mountd_set_exports_list(&mel, l); 432 } 433 #endif 434 435 /* 436 * INTERNAL FUNCTIONS 437 */ 438 439 /* 440 * Initializes NFS exports for the file system given in 'mp' if it supports 441 * file handles; this is determined by checking whether mp's vfs_vptofh and 442 * vfs_fhtovp operations are NULL or not. 443 * 444 * If successful, returns 0 and sets *mnpp to the address of the new 445 * mount_netexport_pair item; otherwise returns and appropriate error code 446 * and *mnpp remains unmodified. 447 */ 448 static int 449 init_exports(struct mount *mp, struct netexport **nep) 450 { 451 int error; 452 struct export_args ea; 453 struct netexport *ne; 454 455 KASSERT(mp != NULL); 456 KASSERT(mp->mnt_op->vfs_vptofh != NULL && 457 mp->mnt_op->vfs_fhtovp != NULL); 458 459 /* Ensure that we do not already have this mount point. */ 460 KASSERT(netexport_lookup(mp) == NULL); 461 462 ne = malloc(sizeof(*ne), M_NFS_EXPORT, M_WAITOK | M_ZERO); 463 ne->ne_mount = mp; 464 465 /* Set the default export entry. Handled internally by export upon 466 * first call. */ 467 memset(&ea, 0, sizeof(ea)); 468 ea.ex_root = -2; 469 if (mp->mnt_flag & MNT_RDONLY) 470 ea.ex_flags |= MNT_EXRDONLY; 471 error = export(ne, &ea); 472 if (error != 0) { 473 free(ne, M_NFS_EXPORT); 474 } else { 475 netexport_insert(ne); 476 *nep = ne; 477 } 478 479 return error; 480 } 481 482 /* 483 * Build hash lists of net addresses and hang them off the mount point. 484 * Called by export() to set up a new entry in the lists of export 485 * addresses. 486 */ 487 static int 488 hang_addrlist(struct mount *mp, struct netexport *nep, 489 const struct export_args *argp) 490 { 491 int error, i; 492 struct netcred *np, *enp; 493 struct radix_node_head *rnh; 494 struct sockaddr *saddr, *smask; 495 struct domain *dom; 496 497 smask = NULL; 498 499 if (argp->ex_addrlen == 0) { 500 if (mp->mnt_flag & MNT_DEFEXPORTED) 501 return EPERM; 502 np = &nep->ne_defexported; 503 np->netc_exflags = argp->ex_flags; 504 crcvt(&np->netc_anon, &argp->ex_anon); 505 np->netc_anon.cr_ref = 1; 506 mp->mnt_flag |= MNT_DEFEXPORTED; 507 return 0; 508 } 509 510 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN) 511 return EINVAL; 512 513 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 514 np = malloc(i, M_NETADDR, M_WAITOK | M_ZERO); 515 saddr = (struct sockaddr *)(np + 1); 516 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 517 if (error) 518 goto out; 519 if (saddr->sa_len > argp->ex_addrlen) 520 saddr->sa_len = argp->ex_addrlen; 521 if (sacheck(saddr) == -1) 522 return EINVAL; 523 if (argp->ex_masklen) { 524 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 525 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 526 if (error) 527 goto out; 528 if (smask->sa_len > argp->ex_masklen) 529 smask->sa_len = argp->ex_masklen; 530 if (smask->sa_family != saddr->sa_family) 531 return EINVAL; 532 if (sacheck(smask) == -1) 533 return EINVAL; 534 } 535 i = saddr->sa_family; 536 if ((rnh = nep->ne_rtable[i]) == 0) { 537 /* 538 * Seems silly to initialize every AF when most are not 539 * used, do so on demand here 540 */ 541 DOMAIN_FOREACH(dom) { 542 if (dom->dom_family == i && dom->dom_rtattach) { 543 dom->dom_rtattach((void **)&nep->ne_rtable[i], 544 dom->dom_rtoffset); 545 break; 546 } 547 } 548 if ((rnh = nep->ne_rtable[i]) == 0) { 549 error = ENOBUFS; 550 goto out; 551 } 552 } 553 554 enp = (struct netcred *)(*rnh->rnh_addaddr)(saddr, smask, rnh, 555 np->netc_rnodes); 556 if (enp != np) { 557 if (enp == NULL) { 558 enp = (struct netcred *)(*rnh->rnh_lookup)(saddr, 559 smask, rnh); 560 if (enp == NULL) { 561 error = EPERM; 562 goto out; 563 } 564 } else 565 enp->netc_refcnt++; 566 567 goto check; 568 } else 569 enp->netc_refcnt = 1; 570 571 np->netc_exflags = argp->ex_flags; 572 crcvt(&np->netc_anon, &argp->ex_anon); 573 np->netc_anon.cr_ref = 1; 574 return 0; 575 check: 576 if (enp->netc_exflags != argp->ex_flags || 577 crcmp(&enp->netc_anon, &argp->ex_anon) != 0) 578 error = EPERM; 579 else 580 error = 0; 581 out: 582 free(np, M_NETADDR); 583 return error; 584 } 585 586 /* 587 * Ensure that the address stored in 'sa' is valid. 588 * Returns zero on success, otherwise -1. 589 */ 590 static int 591 sacheck(struct sockaddr *sa) 592 { 593 594 switch (sa->sa_family) { 595 #ifdef INET 596 case AF_INET: { 597 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 598 char *p = (char *)sin->sin_zero; 599 size_t i; 600 601 if (sin->sin_len != sizeof(*sin)) 602 return -1; 603 if (sin->sin_port != 0) 604 return -1; 605 for (i = 0; i < sizeof(sin->sin_zero); i++) 606 if (*p++ != '\0') 607 return -1; 608 return 0; 609 } 610 #endif 611 #ifdef INET6 612 case AF_INET6: { 613 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 614 615 if (sin6->sin6_len != sizeof(*sin6)) 616 return -1; 617 if (sin6->sin6_port != 0) 618 return -1; 619 return 0; 620 } 621 #endif 622 default: 623 return -1; 624 } 625 } 626 627 /* 628 * Free the netcred object pointed to by the 'rn' radix node. 629 * 'w' holds a pointer to the radix tree head. 630 */ 631 static int 632 free_netcred(struct radix_node *rn, void *w) 633 { 634 struct radix_node_head *rnh = (struct radix_node_head *)w; 635 struct netcred *np = (struct netcred *)(void *)rn; 636 637 (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh); 638 if (--(np->netc_refcnt) <= 0) 639 free(np, M_NETADDR); 640 return 0; 641 } 642 643 /* 644 * Clears the exports list for a given file system. 645 */ 646 static void 647 clear_exports(struct netexport *ne) 648 { 649 struct radix_node_head *rnh; 650 struct mount *mp = ne->ne_mount; 651 int i; 652 653 if (mp->mnt_flag & MNT_EXPUBLIC) { 654 setpublicfs(NULL, NULL, NULL); 655 mp->mnt_flag &= ~MNT_EXPUBLIC; 656 } 657 658 for (i = 0; i <= AF_MAX; i++) { 659 if ((rnh = ne->ne_rtable[i]) != NULL) { 660 (*rnh->rnh_walktree)(rnh, free_netcred, rnh); 661 free(rnh, M_RTABLE); 662 ne->ne_rtable[i] = NULL; 663 } 664 } 665 666 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 667 } 668 669 /* 670 * Add a new export entry (described by an export_args structure) to the 671 * given file system. 672 */ 673 static int 674 export(struct netexport *nep, const struct export_args *argp) 675 { 676 struct mount *mp = nep->ne_mount; 677 int error; 678 679 if (argp->ex_flags & MNT_EXPORTED) { 680 if (argp->ex_flags & MNT_EXPUBLIC) { 681 if ((error = setpublicfs(mp, nep, argp)) != 0) 682 return error; 683 mp->mnt_flag |= MNT_EXPUBLIC; 684 } 685 if ((error = hang_addrlist(mp, nep, argp)) != 0) 686 return error; 687 mp->mnt_flag |= MNT_EXPORTED; 688 } 689 return 0; 690 } 691 692 /* 693 * Set the publicly exported filesystem (WebNFS). Currently, only 694 * one public filesystem is possible in the spec (RFC 2054 and 2055) 695 */ 696 static int 697 setpublicfs(struct mount *mp, struct netexport *nep, 698 const struct export_args *argp) 699 { 700 char *cp; 701 int error; 702 struct vnode *rvp; 703 704 /* 705 * mp == NULL -> invalidate the current info, the FS is 706 * no longer exported. May be called from either export 707 * or unmount, so check if it hasn't already been done. 708 */ 709 if (mp == NULL) { 710 if (nfs_pub.np_valid) { 711 nfs_pub.np_valid = 0; 712 if (nfs_pub.np_index != NULL) { 713 FREE(nfs_pub.np_index, M_TEMP); 714 nfs_pub.np_index = NULL; 715 } 716 } 717 return 0; 718 } 719 720 /* 721 * Only one allowed at a time. 722 */ 723 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 724 return EBUSY; 725 726 /* 727 * Get real filehandle for root of exported FS. 728 */ 729 memset((caddr_t)&nfs_pub.np_handle, 0, sizeof(nfs_pub.np_handle)); 730 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsidx; 731 732 if ((error = VFS_ROOT(mp, &rvp))) 733 return error; 734 735 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 736 return error; 737 738 vput(rvp); 739 740 /* 741 * If an indexfile was specified, pull it in. 742 */ 743 if (argp->ex_indexfile != NULL) { 744 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 745 M_WAITOK); 746 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 747 MAXNAMLEN, (size_t *)0); 748 if (!error) { 749 /* 750 * Check for illegal filenames. 751 */ 752 for (cp = nfs_pub.np_index; *cp; cp++) { 753 if (*cp == '/') { 754 error = EINVAL; 755 break; 756 } 757 } 758 } 759 if (error) { 760 FREE(nfs_pub.np_index, M_TEMP); 761 return error; 762 } 763 } 764 765 nfs_pub.np_mount = mp; 766 nfs_pub.np_valid = 1; 767 return 0; 768 } 769 770 /* 771 * Lookup an export entry in the exports list that matches the address 772 * stored in 'nam'. If no entry is found, the default one is used instead 773 * (if available). 774 */ 775 static struct netcred * 776 netcred_lookup(struct netexport *ne, struct mbuf *nam) 777 { 778 struct netcred *np; 779 struct radix_node_head *rnh; 780 struct sockaddr *saddr; 781 782 if ((ne->ne_mount->mnt_flag & MNT_EXPORTED) == 0) { 783 return NULL; 784 } 785 786 /* 787 * Lookup in the export list first. 788 */ 789 np = NULL; 790 if (nam != NULL) { 791 saddr = mtod(nam, struct sockaddr *); 792 rnh = ne->ne_rtable[saddr->sa_family]; 793 if (rnh != NULL) { 794 np = (struct netcred *) 795 (*rnh->rnh_matchaddr)((caddr_t)saddr, 796 rnh); 797 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 798 np = NULL; 799 } 800 } 801 /* 802 * If no address match, use the default if it exists. 803 */ 804 if (np == NULL && ne->ne_mount->mnt_flag & MNT_DEFEXPORTED) 805 np = &ne->ne_defexported; 806 807 return np; 808 } 809 810 static struct lock netexport_lock = LOCK_INITIALIZER(PVFS, "netexp", 0, 0); 811 812 void 813 netexport_rdlock(void) 814 { 815 816 lockmgr(&netexport_lock, LK_SHARED, NULL); 817 } 818 819 void 820 netexport_rdunlock(void) 821 { 822 823 lockmgr(&netexport_lock, LK_RELEASE, NULL); 824 } 825 826 static void 827 netexport_wrlock(void) 828 { 829 830 lockmgr(&netexport_lock, LK_EXCLUSIVE, NULL); 831 } 832 833 static void 834 netexport_wrunlock(void) 835 { 836 837 lockmgr(&netexport_lock, LK_RELEASE, NULL); 838 } 839
Indexes created Mon Sep 22 13:09:51 GMT 2025