nfs_export.c revision 1.25
1 /* $NetBSD: nfs_export.c,v 1.25 2007/02/04 15:03:20 chs 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 1.25 2007/02/04 15:03:20 chs 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 return EOPNOTSUPP; 248 } 249 250 /* Mark the file system busy. */ 251 error = vfs_busy(mp, LK_NOWAIT, NULL); 252 vput(vp); 253 if (error != 0) 254 return error; 255 256 netexport_wrlock(); 257 ne = netexport_lookup(mp); 258 if (ne == NULL) { 259 error = init_exports(mp, &ne); 260 if (error != 0) { 261 goto out; 262 } 263 } 264 265 KASSERT(ne != NULL); 266 KASSERT(ne->ne_mount == mp); 267 268 /* 269 * XXX: The part marked as 'notyet' works fine from the kernel's 270 * point of view, in the sense that it is able to atomically update 271 * the complete exports list for a file system. However, supporting 272 * this in mountd(8) requires a lot of work; so, for now, keep the 273 * old behavior of updating a single entry per call. 274 * 275 * When mountd(8) is fixed, just remove the second branch of this 276 * preprocessor conditional and enable the first one. 277 */ 278 #ifdef notyet 279 netexport_clear(ne); 280 for (i = 0; error == 0 && i < mel->mel_nexports; i++) 281 error = export(ne, &mel->mel_exports[i]); 282 #else 283 if (mel->mel_nexports == 0) 284 netexport_clear(ne); 285 else if (mel->mel_nexports == 1) 286 error = export(ne, &mel->mel_exports[0]); 287 else { 288 printf("mountd_set_exports_list: Cannot set more than one " 289 "entry at once (unimplemented)\n"); 290 error = EOPNOTSUPP; 291 } 292 #endif 293 294 out: 295 netexport_wrunlock(); 296 vfs_unbusy(mp); 297 return error; 298 } 299 300 static void 301 netexport_insert(struct netexport *ne) 302 { 303 304 CIRCLEQ_INSERT_HEAD(&netexport_list, ne, ne_list); 305 } 306 307 static void 308 netexport_remove(struct netexport *ne) 309 { 310 311 CIRCLEQ_REMOVE(&netexport_list, ne, ne_list); 312 } 313 314 static struct netexport * 315 netexport_lookup(const struct mount *mp) 316 { 317 struct netexport *ne; 318 319 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 320 if (ne->ne_mount == mp) { 321 goto done; 322 } 323 } 324 ne = NULL; 325 done: 326 return ne; 327 } 328 329 static struct netexport * 330 netexport_lookup_byfsid(const fsid_t *fsid) 331 { 332 struct netexport *ne; 333 334 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 335 const struct mount *mp = ne->ne_mount; 336 337 if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] && 338 mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) { 339 goto done; 340 } 341 } 342 ne = NULL; 343 done: 344 345 return ne; 346 } 347 348 /* 349 * Check if the file system specified by the 'mp' mount structure is 350 * exported to a client with 'anon' anonymous credentials. The 'mb' 351 * argument is an mbuf containing the network address of the client. 352 * The return parameters for the export flags for the client are returned 353 * in the address specified by 'wh'. 354 * 355 * This function is used exclusively by the NFS server. It is generally 356 * invoked before VFS_FHTOVP to validate that client has access to the 357 * file system. 358 */ 359 360 int 361 netexport_check(const fsid_t *fsid, struct mbuf *mb, struct mount **mpp, 362 int *wh, kauth_cred_t *anon) 363 { 364 struct netexport *ne; 365 struct netcred *np; 366 367 ne = netexport_lookup_byfsid(fsid); 368 if (ne == NULL) { 369 return EACCES; 370 } 371 np = netcred_lookup(ne, mb); 372 if (np == NULL) { 373 return EACCES; 374 } 375 376 *mpp = ne->ne_mount; 377 *wh = np->netc_exflags; 378 *anon = np->netc_anon; 379 380 return 0; 381 } 382 383 #ifdef COMPAT_30 384 /* 385 * Handles legacy export requests. In this case, the export information 386 * is hardcoded in a specific place of the mount arguments structure (given 387 * in data); the request for an update is given through the fspec field 388 * (also in a known location), which must be a null pointer. 389 * 390 * Returns EJUSTRETURN if the given command was not a export request. 391 * Otherwise, returns 0 on success or an appropriate error code otherwise. 392 */ 393 int 394 nfs_update_exports_30(struct mount *mp, const char *path, void *data, 395 struct lwp *l) 396 { 397 int error; 398 struct { 399 const char *fspec; 400 struct export_args30 eargs; 401 } args; 402 struct mountd_exports_list mel; 403 404 mel.mel_path = path; 405 406 error = copyin(data, &args, sizeof(args)); 407 if (error != 0) 408 return EJUSTRETURN; 409 410 if (args.fspec != NULL) 411 return EJUSTRETURN; 412 413 if (args.eargs.ex_flags & 0x00020000) { 414 /* Request to delete exports. The mask above holds the 415 * value that used to be in MNT_DELEXPORT. */ 416 mel.mel_nexports = 0; 417 } else { 418 struct export_args eargs; 419 420 /* The following assumes export_args has not changed since 421 * export_args30. */ 422 memcpy(&eargs, &args.eargs, sizeof(struct export_args)); 423 424 mel.mel_nexports = 1; 425 mel.mel_exports = &eargs; 426 } 427 428 return mountd_set_exports_list(&mel, l); 429 } 430 #endif 431 432 /* 433 * INTERNAL FUNCTIONS 434 */ 435 436 /* 437 * Initializes NFS exports for the file system given in 'mp' if it supports 438 * file handles; this is determined by checking whether mp's vfs_vptofh and 439 * vfs_fhtovp operations are NULL or not. 440 * 441 * If successful, returns 0 and sets *mnpp to the address of the new 442 * mount_netexport_pair item; otherwise returns an appropriate error code 443 * and *mnpp remains unmodified. 444 */ 445 static int 446 init_exports(struct mount *mp, struct netexport **nep) 447 { 448 int error; 449 struct export_args ea; 450 struct netexport *ne; 451 452 KASSERT(mp != NULL); 453 454 /* Ensure that we do not already have this mount point. */ 455 KASSERT(netexport_lookup(mp) == NULL); 456 457 ne = malloc(sizeof(*ne), M_NFS_EXPORT, M_WAITOK | M_ZERO); 458 ne->ne_mount = mp; 459 460 /* Set the default export entry. Handled internally by export upon 461 * first call. */ 462 memset(&ea, 0, sizeof(ea)); 463 ea.ex_root = -2; 464 if (mp->mnt_flag & MNT_RDONLY) 465 ea.ex_flags |= MNT_EXRDONLY; 466 error = export(ne, &ea); 467 if (error != 0) { 468 free(ne, M_NFS_EXPORT); 469 } else { 470 netexport_insert(ne); 471 *nep = ne; 472 } 473 474 return error; 475 } 476 477 /* 478 * Build hash lists of net addresses and hang them off the mount point. 479 * Called by export() to set up a new entry in the lists of export 480 * addresses. 481 */ 482 static int 483 hang_addrlist(struct mount *mp, struct netexport *nep, 484 const struct export_args *argp) 485 { 486 int error, i; 487 struct netcred *np, *enp; 488 struct radix_node_head *rnh; 489 struct sockaddr *saddr, *smask; 490 struct domain *dom; 491 492 smask = NULL; 493 494 if (argp->ex_addrlen == 0) { 495 if (mp->mnt_flag & MNT_DEFEXPORTED) 496 return EPERM; 497 np = &nep->ne_defexported; 498 KASSERT(np->netc_anon == NULL); 499 np->netc_anon = kauth_cred_alloc(); 500 np->netc_exflags = argp->ex_flags; 501 kauth_uucred_to_cred(np->netc_anon, &argp->ex_anon); 502 mp->mnt_flag |= MNT_DEFEXPORTED; 503 return 0; 504 } 505 506 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN) 507 return EINVAL; 508 509 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 510 np = malloc(i, M_NETADDR, M_WAITOK | M_ZERO); 511 np->netc_anon = kauth_cred_alloc(); 512 saddr = (struct sockaddr *)(np + 1); 513 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 514 if (error) 515 goto out; 516 if (saddr->sa_len > argp->ex_addrlen) 517 saddr->sa_len = argp->ex_addrlen; 518 if (sacheck(saddr) == -1) 519 return EINVAL; 520 if (argp->ex_masklen) { 521 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 522 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 523 if (error) 524 goto out; 525 if (smask->sa_len > argp->ex_masklen) 526 smask->sa_len = argp->ex_masklen; 527 if (smask->sa_family != saddr->sa_family) 528 return EINVAL; 529 if (sacheck(smask) == -1) 530 return EINVAL; 531 } 532 i = saddr->sa_family; 533 if ((rnh = nep->ne_rtable[i]) == 0) { 534 /* 535 * Seems silly to initialize every AF when most are not 536 * used, do so on demand here 537 */ 538 DOMAIN_FOREACH(dom) { 539 if (dom->dom_family == i && dom->dom_rtattach) { 540 dom->dom_rtattach((void **)&nep->ne_rtable[i], 541 dom->dom_rtoffset); 542 break; 543 } 544 } 545 if ((rnh = nep->ne_rtable[i]) == 0) { 546 error = ENOBUFS; 547 goto out; 548 } 549 } 550 551 enp = (struct netcred *)(*rnh->rnh_addaddr)(saddr, smask, rnh, 552 np->netc_rnodes); 553 if (enp != np) { 554 if (enp == NULL) { 555 enp = (struct netcred *)(*rnh->rnh_lookup)(saddr, 556 smask, rnh); 557 if (enp == NULL) { 558 error = EPERM; 559 goto out; 560 } 561 } else 562 enp->netc_refcnt++; 563 564 goto check; 565 } else 566 enp->netc_refcnt = 1; 567 568 np->netc_exflags = argp->ex_flags; 569 kauth_uucred_to_cred(np->netc_anon, &argp->ex_anon); 570 return 0; 571 check: 572 if (enp->netc_exflags != argp->ex_flags || 573 kauth_cred_uucmp(enp->netc_anon, &argp->ex_anon) != 0) 574 error = EPERM; 575 else 576 error = 0; 577 out: 578 KASSERT(np->netc_anon != NULL); 579 kauth_cred_free(np->netc_anon); 580 free(np, M_NETADDR); 581 return error; 582 } 583 584 /* 585 * Ensure that the address stored in 'sa' is valid. 586 * Returns zero on success, otherwise -1. 587 */ 588 static int 589 sacheck(struct sockaddr *sa) 590 { 591 592 switch (sa->sa_family) { 593 #ifdef INET 594 case AF_INET: { 595 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 596 char *p = (char *)sin->sin_zero; 597 size_t i; 598 599 if (sin->sin_len != sizeof(*sin)) 600 return -1; 601 if (sin->sin_port != 0) 602 return -1; 603 for (i = 0; i < sizeof(sin->sin_zero); i++) 604 if (*p++ != '\0') 605 return -1; 606 return 0; 607 } 608 #endif 609 #ifdef INET6 610 case AF_INET6: { 611 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 612 613 if (sin6->sin6_len != sizeof(*sin6)) 614 return -1; 615 if (sin6->sin6_port != 0) 616 return -1; 617 return 0; 618 } 619 #endif 620 default: 621 return -1; 622 } 623 } 624 625 /* 626 * Free the netcred object pointed to by the 'rn' radix node. 627 * 'w' holds a pointer to the radix tree head. 628 */ 629 static int 630 free_netcred(struct radix_node *rn, void *w) 631 { 632 struct radix_node_head *rnh = (struct radix_node_head *)w; 633 struct netcred *np = (struct netcred *)(void *)rn; 634 635 (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh); 636 if (--(np->netc_refcnt) <= 0) { 637 KASSERT(np->netc_anon != NULL); 638 kauth_cred_free(np->netc_anon); 639 free(np, M_NETADDR); 640 } 641 return 0; 642 } 643 644 /* 645 * Clears the exports list for a given file system. 646 */ 647 static void 648 netexport_clear(struct netexport *ne) 649 { 650 struct radix_node_head *rnh; 651 struct mount *mp = ne->ne_mount; 652 int i; 653 654 if (mp->mnt_flag & MNT_EXPUBLIC) { 655 setpublicfs(NULL, NULL, NULL); 656 mp->mnt_flag &= ~MNT_EXPUBLIC; 657 } 658 659 for (i = 0; i <= AF_MAX; i++) { 660 if ((rnh = ne->ne_rtable[i]) != NULL) { 661 (*rnh->rnh_walktree)(rnh, free_netcred, rnh); 662 free(rnh, M_RTABLE); 663 ne->ne_rtable[i] = NULL; 664 } 665 } 666 667 if ((mp->mnt_flag & MNT_DEFEXPORTED) != 0) { 668 struct netcred *np = &ne->ne_defexported; 669 670 KASSERT(np->netc_anon != NULL); 671 kauth_cred_free(np->netc_anon); 672 np->netc_anon = NULL; 673 } else { 674 KASSERT(ne->ne_defexported.netc_anon == NULL); 675 } 676 677 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 678 } 679 680 /* 681 * Add a new export entry (described by an export_args structure) to the 682 * given file system. 683 */ 684 static int 685 export(struct netexport *nep, const struct export_args *argp) 686 { 687 struct mount *mp = nep->ne_mount; 688 int error; 689 690 if (argp->ex_flags & MNT_EXPORTED) { 691 if (argp->ex_flags & MNT_EXPUBLIC) { 692 if ((error = setpublicfs(mp, nep, argp)) != 0) 693 return error; 694 mp->mnt_flag |= MNT_EXPUBLIC; 695 } 696 if ((error = hang_addrlist(mp, nep, argp)) != 0) 697 return error; 698 mp->mnt_flag |= MNT_EXPORTED; 699 } 700 return 0; 701 } 702 703 /* 704 * Set the publicly exported filesystem (WebNFS). Currently, only 705 * one public filesystem is possible in the spec (RFC 2054 and 2055) 706 */ 707 static int 708 setpublicfs(struct mount *mp, struct netexport *nep, 709 const struct export_args *argp) 710 { 711 char *cp; 712 int error; 713 struct vnode *rvp; 714 size_t fhsize; 715 716 /* 717 * mp == NULL -> invalidate the current info, the FS is 718 * no longer exported. May be called from either export 719 * or unmount, so check if it hasn't already been done. 720 */ 721 if (mp == NULL) { 722 if (nfs_pub.np_valid) { 723 nfs_pub.np_valid = 0; 724 if (nfs_pub.np_handle != NULL) { 725 free(nfs_pub.np_handle, M_TEMP); 726 nfs_pub.np_handle = NULL; 727 } 728 if (nfs_pub.np_index != NULL) { 729 FREE(nfs_pub.np_index, M_TEMP); 730 nfs_pub.np_index = NULL; 731 } 732 } 733 return 0; 734 } 735 736 /* 737 * Only one allowed at a time. 738 */ 739 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 740 return EBUSY; 741 742 /* 743 * Get real filehandle for root of exported FS. 744 */ 745 if ((error = VFS_ROOT(mp, &rvp))) 746 return error; 747 748 fhsize = 0; 749 error = vfs_composefh(rvp, NULL, &fhsize); 750 if (error != E2BIG) 751 return error; 752 nfs_pub.np_handle = malloc(fhsize, M_TEMP, M_NOWAIT); 753 if (nfs_pub.np_handle == NULL) 754 error = ENOMEM; 755 else 756 error = vfs_composefh(rvp, nfs_pub.np_handle, &fhsize); 757 if (error) 758 return error; 759 760 vput(rvp); 761 762 /* 763 * If an indexfile was specified, pull it in. 764 */ 765 if (argp->ex_indexfile != NULL) { 766 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 767 M_WAITOK); 768 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 769 MAXNAMLEN, (size_t *)0); 770 if (!error) { 771 /* 772 * Check for illegal filenames. 773 */ 774 for (cp = nfs_pub.np_index; *cp; cp++) { 775 if (*cp == '/') { 776 error = EINVAL; 777 break; 778 } 779 } 780 } 781 if (error) { 782 FREE(nfs_pub.np_index, M_TEMP); 783 return error; 784 } 785 } 786 787 nfs_pub.np_mount = mp; 788 nfs_pub.np_valid = 1; 789 return 0; 790 } 791 792 /* 793 * Lookup an export entry in the exports list that matches the address 794 * stored in 'nam'. If no entry is found, the default one is used instead 795 * (if available). 796 */ 797 static struct netcred * 798 netcred_lookup(struct netexport *ne, struct mbuf *nam) 799 { 800 struct netcred *np; 801 struct radix_node_head *rnh; 802 struct sockaddr *saddr; 803 804 if ((ne->ne_mount->mnt_flag & MNT_EXPORTED) == 0) { 805 return NULL; 806 } 807 808 /* 809 * Lookup in the export list first. 810 */ 811 np = NULL; 812 if (nam != NULL) { 813 saddr = mtod(nam, struct sockaddr *); 814 rnh = ne->ne_rtable[saddr->sa_family]; 815 if (rnh != NULL) { 816 np = (struct netcred *) 817 (*rnh->rnh_matchaddr)((caddr_t)saddr, 818 rnh); 819 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 820 np = NULL; 821 } 822 } 823 /* 824 * If no address match, use the default if it exists. 825 */ 826 if (np == NULL && ne->ne_mount->mnt_flag & MNT_DEFEXPORTED) 827 np = &ne->ne_defexported; 828 829 return np; 830 } 831 832 static struct lock netexport_lock = LOCK_INITIALIZER(PVFS, "netexp", 0, 0); 833 834 void 835 netexport_rdlock(void) 836 { 837 838 lockmgr(&netexport_lock, LK_SHARED, NULL); 839 } 840 841 void 842 netexport_rdunlock(void) 843 { 844 845 lockmgr(&netexport_lock, LK_RELEASE, NULL); 846 } 847 848 static void 849 netexport_wrlock(void) 850 { 851 852 lockmgr(&netexport_lock, LK_EXCLUSIVE, NULL); 853 } 854 855 static void 856 netexport_wrunlock(void) 857 { 858 859 lockmgr(&netexport_lock, LK_RELEASE, NULL); 860 } 861
Indexes created Tue Sep 23 07:09:52 GMT 2025