nfs_export.c revision 1.9
1 /* $NetBSD: nfs_export.c,v 1.9 2006/01/05 12:21:00 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 1.9 2006/01/05 12:21:00 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 struct fid fid; 230 231 if (suser(l->l_proc->p_ucred, &l->l_proc->p_acflag) != 0) 232 return EPERM; 233 234 /* Lookup the file system path. */ 235 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, mel->mel_path, l); 236 error = namei(&nd); 237 if (error != 0) 238 return error; 239 vp = nd.ni_vp; 240 mp = vp->v_mount; 241 242 /* The selected file system may not support NFS exports, so ensure 243 * it does. */ 244 if (mp->mnt_op->vfs_vptofh == NULL || mp->mnt_op->vfs_fhtovp == NULL || 245 VFS_VPTOFH(vp, &fid) != 0) { 246 error = EOPNOTSUPP; 247 goto out_locked; 248 } 249 KASSERT(mp->mnt_op->vfs_vptofh != NULL && 250 mp->mnt_op->vfs_fhtovp != NULL); 251 252 /* Mark the file system busy. */ 253 error = vfs_busy(mp, LK_NOWAIT, NULL); 254 if (error != 0) 255 goto out_locked; 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_locked2; 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 clear_exports(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 clear_exports(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_locked2: 296 netexport_wrunlock(); 297 vfs_unbusy(mp); 298 299 out_locked: 300 vput(vp); 301 302 return error; 303 } 304 305 static void 306 netexport_insert(struct netexport *ne) 307 { 308 309 CIRCLEQ_INSERT_HEAD(&netexport_list, ne, ne_list); 310 } 311 312 static void 313 netexport_remove(struct netexport *ne) 314 { 315 316 CIRCLEQ_REMOVE(&netexport_list, ne, ne_list); 317 } 318 319 static struct netexport * 320 netexport_lookup(const struct mount *mp) 321 { 322 struct netexport *ne; 323 324 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 325 if (ne->ne_mount == mp) { 326 goto done; 327 } 328 } 329 ne = NULL; 330 done: 331 return ne; 332 } 333 334 static struct netexport * 335 netexport_lookup_byfsid(const fsid_t *fsid) 336 { 337 struct netexport *ne; 338 339 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 340 const struct mount *mp = ne->ne_mount; 341 342 if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] && 343 mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) { 344 goto done; 345 } 346 } 347 ne = NULL; 348 done: 349 350 return ne; 351 } 352 353 /* 354 * Check if the file system specified by the 'mp' mount structure is 355 * exported to a client with 'anon' anonymous credentials. The 'mb' 356 * argument is an mbuf containing the network address of the client. 357 * The return parameters for the export flags for the client are returned 358 * in the address specified by 'wh'. 359 * 360 * This function is used exclusively by the NFS server. It is generally 361 * invoked before VFS_FHTOVP to validate that client has access to the 362 * file system. 363 */ 364 365 int 366 netexport_check(const fsid_t *fsid, struct mbuf *mb, struct mount **mpp, 367 int *wh, struct ucred **anon) 368 { 369 struct netexport *ne; 370 struct netcred *np; 371 372 ne = netexport_lookup_byfsid(fsid); 373 if (ne == NULL) { 374 return EACCES; 375 } 376 np = netcred_lookup(ne, mb); 377 if (np == NULL) { 378 return EACCES; 379 } 380 381 *mpp = ne->ne_mount; 382 *wh = np->netc_exflags; 383 *anon = &np->netc_anon; 384 385 return 0; 386 } 387 388 #ifdef COMPAT_30 389 /* 390 * Handles legacy export requests. In this case, the export information 391 * is hardcoded in a specific place of the mount arguments structure (given 392 * in data); the request for an update is given through the fspec field 393 * (also in a known location), which must be a null pointer. 394 * 395 * Returns EJUSTRETURN if the given command was not a export request. 396 * Otherwise, returns 0 on success or an appropriate error code otherwise. 397 */ 398 int 399 nfs_update_exports_30(struct mount *mp, const char *path, void *data, 400 struct lwp *l) 401 { 402 int error; 403 struct { 404 const char *fspec; 405 struct export_args30 eargs; 406 } args; 407 struct mountd_exports_list mel; 408 409 mel.mel_path = path; 410 411 error = copyin(data, &args, sizeof(args)); 412 if (error != 0) 413 return EJUSTRETURN; 414 415 if (args.fspec != NULL) 416 return EJUSTRETURN; 417 418 if (args.eargs.ex_flags & 0x00020000) { 419 /* Request to delete exports. The mask above holds the 420 * value that used to be in MNT_DELEXPORT. */ 421 mel.mel_nexports = 0; 422 } else { 423 struct export_args eargs; 424 425 /* The following assumes export_args has not changed since 426 * export_args30. */ 427 memcpy(&eargs, &args.eargs, sizeof(struct export_args)); 428 429 mel.mel_nexports = 1; 430 mel.mel_exports = &eargs; 431 } 432 433 return mountd_set_exports_list(&mel, l); 434 } 435 #endif 436 437 /* 438 * INTERNAL FUNCTIONS 439 */ 440 441 /* 442 * Initializes NFS exports for the file system given in 'mp' if it supports 443 * file handles; this is determined by checking whether mp's vfs_vptofh and 444 * vfs_fhtovp operations are NULL or not. 445 * 446 * If successful, returns 0 and sets *mnpp to the address of the new 447 * mount_netexport_pair item; otherwise returns and appropriate error code 448 * and *mnpp remains unmodified. 449 */ 450 static int 451 init_exports(struct mount *mp, struct netexport **nep) 452 { 453 int error; 454 struct export_args ea; 455 struct netexport *ne; 456 457 KASSERT(mp != NULL); 458 KASSERT(mp->mnt_op->vfs_vptofh != NULL && 459 mp->mnt_op->vfs_fhtovp != NULL); 460 461 /* Ensure that we do not already have this mount point. */ 462 KASSERT(netexport_lookup(mp) == NULL); 463 464 ne = malloc(sizeof(*ne), M_NFS_EXPORT, M_WAITOK | M_ZERO); 465 ne->ne_mount = mp; 466 467 /* Set the default export entry. Handled internally by export upon 468 * first call. */ 469 memset(&ea, 0, sizeof(ea)); 470 ea.ex_root = -2; 471 if (mp->mnt_flag & MNT_RDONLY) 472 ea.ex_flags |= MNT_EXRDONLY; 473 error = export(ne, &ea); 474 if (error != 0) { 475 free(ne, M_NFS_EXPORT); 476 } else { 477 netexport_insert(ne); 478 *nep = ne; 479 } 480 481 return error; 482 } 483 484 /* 485 * Build hash lists of net addresses and hang them off the mount point. 486 * Called by export() to set up a new entry in the lists of export 487 * addresses. 488 */ 489 static int 490 hang_addrlist(struct mount *mp, struct netexport *nep, 491 const struct export_args *argp) 492 { 493 int error, i; 494 struct netcred *np, *enp; 495 struct radix_node_head *rnh; 496 struct sockaddr *saddr, *smask; 497 struct domain *dom; 498 499 smask = NULL; 500 501 if (argp->ex_addrlen == 0) { 502 if (mp->mnt_flag & MNT_DEFEXPORTED) 503 return EPERM; 504 np = &nep->ne_defexported; 505 np->netc_exflags = argp->ex_flags; 506 crcvt(&np->netc_anon, &argp->ex_anon); 507 np->netc_anon.cr_ref = 1; 508 mp->mnt_flag |= MNT_DEFEXPORTED; 509 return 0; 510 } 511 512 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN) 513 return EINVAL; 514 515 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 516 np = malloc(i, M_NETADDR, M_WAITOK | M_ZERO); 517 saddr = (struct sockaddr *)(np + 1); 518 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 519 if (error) 520 goto out; 521 if (saddr->sa_len > argp->ex_addrlen) 522 saddr->sa_len = argp->ex_addrlen; 523 if (sacheck(saddr) == -1) 524 return EINVAL; 525 if (argp->ex_masklen) { 526 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 527 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 528 if (error) 529 goto out; 530 if (smask->sa_len > argp->ex_masklen) 531 smask->sa_len = argp->ex_masklen; 532 if (smask->sa_family != saddr->sa_family) 533 return EINVAL; 534 if (sacheck(smask) == -1) 535 return EINVAL; 536 } 537 i = saddr->sa_family; 538 if ((rnh = nep->ne_rtable[i]) == 0) { 539 /* 540 * Seems silly to initialize every AF when most are not 541 * used, do so on demand here 542 */ 543 DOMAIN_FOREACH(dom) { 544 if (dom->dom_family == i && dom->dom_rtattach) { 545 dom->dom_rtattach((void **)&nep->ne_rtable[i], 546 dom->dom_rtoffset); 547 break; 548 } 549 } 550 if ((rnh = nep->ne_rtable[i]) == 0) { 551 error = ENOBUFS; 552 goto out; 553 } 554 } 555 556 enp = (struct netcred *)(*rnh->rnh_addaddr)(saddr, smask, rnh, 557 np->netc_rnodes); 558 if (enp != np) { 559 if (enp == NULL) { 560 enp = (struct netcred *)(*rnh->rnh_lookup)(saddr, 561 smask, rnh); 562 if (enp == NULL) { 563 error = EPERM; 564 goto out; 565 } 566 } else 567 enp->netc_refcnt++; 568 569 goto check; 570 } else 571 enp->netc_refcnt = 1; 572 573 np->netc_exflags = argp->ex_flags; 574 crcvt(&np->netc_anon, &argp->ex_anon); 575 np->netc_anon.cr_ref = 1; 576 return 0; 577 check: 578 if (enp->netc_exflags != argp->ex_flags || 579 crcmp(&enp->netc_anon, &argp->ex_anon) != 0) 580 error = EPERM; 581 else 582 error = 0; 583 out: 584 free(np, M_NETADDR); 585 return error; 586 } 587 588 /* 589 * Ensure that the address stored in 'sa' is valid. 590 * Returns zero on success, otherwise -1. 591 */ 592 static int 593 sacheck(struct sockaddr *sa) 594 { 595 596 switch (sa->sa_family) { 597 #ifdef INET 598 case AF_INET: { 599 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 600 char *p = (char *)sin->sin_zero; 601 size_t i; 602 603 if (sin->sin_len != sizeof(*sin)) 604 return -1; 605 if (sin->sin_port != 0) 606 return -1; 607 for (i = 0; i < sizeof(sin->sin_zero); i++) 608 if (*p++ != '\0') 609 return -1; 610 return 0; 611 } 612 #endif 613 #ifdef INET6 614 case AF_INET6: { 615 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 616 617 if (sin6->sin6_len != sizeof(*sin6)) 618 return -1; 619 if (sin6->sin6_port != 0) 620 return -1; 621 return 0; 622 } 623 #endif 624 default: 625 return -1; 626 } 627 } 628 629 /* 630 * Free the netcred object pointed to by the 'rn' radix node. 631 * 'w' holds a pointer to the radix tree head. 632 */ 633 static int 634 free_netcred(struct radix_node *rn, void *w) 635 { 636 struct radix_node_head *rnh = (struct radix_node_head *)w; 637 struct netcred *np = (struct netcred *)(void *)rn; 638 639 (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh); 640 if (--(np->netc_refcnt) <= 0) 641 free(np, M_NETADDR); 642 return 0; 643 } 644 645 /* 646 * Clears the exports list for a given file system. 647 */ 648 static void 649 clear_exports(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 (*rnh->rnh_walktree)(rnh, free_netcred, rnh); 663 free(rnh, M_RTABLE); 664 ne->ne_rtable[i] = NULL; 665 } 666 } 667 668 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 669 } 670 671 /* 672 * Add a new export entry (described by an export_args structure) to the 673 * given file system. 674 */ 675 static int 676 export(struct netexport *nep, const struct export_args *argp) 677 { 678 struct mount *mp = nep->ne_mount; 679 int error; 680 681 if (argp->ex_flags & MNT_EXPORTED) { 682 if (argp->ex_flags & MNT_EXPUBLIC) { 683 if ((error = setpublicfs(mp, nep, argp)) != 0) 684 return error; 685 mp->mnt_flag |= MNT_EXPUBLIC; 686 } 687 if ((error = hang_addrlist(mp, nep, argp)) != 0) 688 return error; 689 mp->mnt_flag |= MNT_EXPORTED; 690 } 691 return 0; 692 } 693 694 /* 695 * Set the publicly exported filesystem (WebNFS). Currently, only 696 * one public filesystem is possible in the spec (RFC 2054 and 2055) 697 */ 698 static int 699 setpublicfs(struct mount *mp, struct netexport *nep, 700 const struct export_args *argp) 701 { 702 char *cp; 703 int error; 704 struct vnode *rvp; 705 706 /* 707 * mp == NULL -> invalidate the current info, the FS is 708 * no longer exported. May be called from either export 709 * or unmount, so check if it hasn't already been done. 710 */ 711 if (mp == NULL) { 712 if (nfs_pub.np_valid) { 713 nfs_pub.np_valid = 0; 714 if (nfs_pub.np_index != NULL) { 715 FREE(nfs_pub.np_index, M_TEMP); 716 nfs_pub.np_index = NULL; 717 } 718 } 719 return 0; 720 } 721 722 /* 723 * Only one allowed at a time. 724 */ 725 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 726 return EBUSY; 727 728 /* 729 * Get real filehandle for root of exported FS. 730 */ 731 memset((caddr_t)&nfs_pub.np_handle, 0, sizeof(nfs_pub.np_handle)); 732 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsidx; 733 734 if ((error = VFS_ROOT(mp, &rvp))) 735 return error; 736 737 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 738 return error; 739 740 vput(rvp); 741 742 /* 743 * If an indexfile was specified, pull it in. 744 */ 745 if (argp->ex_indexfile != NULL) { 746 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 747 M_WAITOK); 748 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 749 MAXNAMLEN, (size_t *)0); 750 if (!error) { 751 /* 752 * Check for illegal filenames. 753 */ 754 for (cp = nfs_pub.np_index; *cp; cp++) { 755 if (*cp == '/') { 756 error = EINVAL; 757 break; 758 } 759 } 760 } 761 if (error) { 762 FREE(nfs_pub.np_index, M_TEMP); 763 return error; 764 } 765 } 766 767 nfs_pub.np_mount = mp; 768 nfs_pub.np_valid = 1; 769 return 0; 770 } 771 772 /* 773 * Lookup an export entry in the exports list that matches the address 774 * stored in 'nam'. If no entry is found, the default one is used instead 775 * (if available). 776 */ 777 static struct netcred * 778 netcred_lookup(struct netexport *ne, struct mbuf *nam) 779 { 780 struct netcred *np; 781 struct radix_node_head *rnh; 782 struct sockaddr *saddr; 783 784 if ((ne->ne_mount->mnt_flag & MNT_EXPORTED) == 0) { 785 return NULL; 786 } 787 788 /* 789 * Lookup in the export list first. 790 */ 791 np = NULL; 792 if (nam != NULL) { 793 saddr = mtod(nam, struct sockaddr *); 794 rnh = ne->ne_rtable[saddr->sa_family]; 795 if (rnh != NULL) { 796 np = (struct netcred *) 797 (*rnh->rnh_matchaddr)((caddr_t)saddr, 798 rnh); 799 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 800 np = NULL; 801 } 802 } 803 /* 804 * If no address match, use the default if it exists. 805 */ 806 if (np == NULL && ne->ne_mount->mnt_flag & MNT_DEFEXPORTED) 807 np = &ne->ne_defexported; 808 809 return np; 810 } 811 812 static struct lock netexport_lock = LOCK_INITIALIZER(PVFS, "netexp", 0, 0); 813 814 void 815 netexport_rdlock(void) 816 { 817 818 lockmgr(&netexport_lock, LK_SHARED, NULL); 819 } 820 821 void 822 netexport_rdunlock(void) 823 { 824 825 lockmgr(&netexport_lock, LK_RELEASE, NULL); 826 } 827 828 static void 829 netexport_wrlock(void) 830 { 831 832 lockmgr(&netexport_lock, LK_EXCLUSIVE, NULL); 833 } 834 835 static void 836 netexport_wrunlock(void) 837 { 838 839 lockmgr(&netexport_lock, LK_RELEASE, NULL); 840 } 841
Indexes created Wed Sep 24 15:09:51 GMT 2025