nfs_export.c revision 1.12
1 /* $NetBSD: nfs_export.c,v 1.12 2006/05/18 10:07:34 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 1.12 2006/05/18 10:07:34 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 #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 } 196 197 KASSERT(mp->mnt_op->vfs_vptofh != NULL && 198 mp->mnt_op->vfs_fhtovp != NULL); 199 netexport_clear(ne); 200 netexport_remove(ne); 201 netexport_wrunlock(); 202 free(ne, M_NFS_EXPORT); 203 } 204 205 /* 206 * Atomically set the NFS exports list of the given file system, replacing 207 * it with a new list of entries. 208 * 209 * Returns zero on success or an appropriate error code otherwise. 210 * 211 * Helper function for the nfssvc(2) system call (NFSSVC_SETEXPORTSLIST 212 * command). 213 */ 214 int 215 mountd_set_exports_list(const struct mountd_exports_list *mel, struct lwp *l) 216 { 217 int error; 218 #ifdef notyet 219 /* XXX: See below to see the reason why this is disabled. */ 220 size_t i; 221 #endif 222 struct mount *mp; 223 struct netexport *ne; 224 struct nameidata nd; 225 struct vnode *vp; 226 struct fid fid; 227 228 if (kauth_authorize_generic(l->l_proc->p_cred, KAUTH_GENERIC_ISSUSER, 229 &l->l_proc->p_acflag) != 0) 230 return EPERM; 231 232 /* Lookup the file system path. */ 233 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, mel->mel_path, l); 234 error = namei(&nd); 235 if (error != 0) 236 return error; 237 vp = nd.ni_vp; 238 mp = vp->v_mount; 239 240 /* The selected file system may not support NFS exports, so ensure 241 * it does. */ 242 if (mp->mnt_op->vfs_vptofh == NULL || mp->mnt_op->vfs_fhtovp == NULL || 243 VFS_VPTOFH(vp, &fid) != 0) { 244 error = EOPNOTSUPP; 245 goto out_locked; 246 } 247 KASSERT(fid.fid_len <= _VFS_MAXFIDSZ); 248 KASSERT(mp->mnt_op->vfs_vptofh != NULL && 249 mp->mnt_op->vfs_fhtovp != NULL); 250 251 /* Mark the file system busy. */ 252 error = vfs_busy(mp, LK_NOWAIT, NULL); 253 if (error != 0) 254 goto out_locked; 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_locked2; 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_locked2: 295 netexport_wrunlock(); 296 vfs_unbusy(mp); 297 298 out_locked: 299 vput(vp); 300 301 return error; 302 } 303 304 static void 305 netexport_insert(struct netexport *ne) 306 { 307 308 CIRCLEQ_INSERT_HEAD(&netexport_list, ne, ne_list); 309 } 310 311 static void 312 netexport_remove(struct netexport *ne) 313 { 314 315 CIRCLEQ_REMOVE(&netexport_list, ne, ne_list); 316 } 317 318 static struct netexport * 319 netexport_lookup(const struct mount *mp) 320 { 321 struct netexport *ne; 322 323 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 324 if (ne->ne_mount == mp) { 325 goto done; 326 } 327 } 328 ne = NULL; 329 done: 330 return ne; 331 } 332 333 static struct netexport * 334 netexport_lookup_byfsid(const fsid_t *fsid) 335 { 336 struct netexport *ne; 337 338 CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) { 339 const struct mount *mp = ne->ne_mount; 340 341 if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] && 342 mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) { 343 goto done; 344 } 345 } 346 ne = NULL; 347 done: 348 349 return ne; 350 } 351 352 /* 353 * Check if the file system specified by the 'mp' mount structure is 354 * exported to a client with 'anon' anonymous credentials. The 'mb' 355 * argument is an mbuf containing the network address of the client. 356 * The return parameters for the export flags for the client are returned 357 * in the address specified by 'wh'. 358 * 359 * This function is used exclusively by the NFS server. It is generally 360 * invoked before VFS_FHTOVP to validate that client has access to the 361 * file system. 362 */ 363 364 int 365 netexport_check(const fsid_t *fsid, struct mbuf *mb, struct mount **mpp, 366 int *wh, kauth_cred_t *anon) 367 { 368 struct netexport *ne; 369 struct netcred *np; 370 371 ne = netexport_lookup_byfsid(fsid); 372 if (ne == NULL) { 373 return EACCES; 374 } 375 np = netcred_lookup(ne, mb); 376 if (np == NULL) { 377 return EACCES; 378 } 379 380 *mpp = ne->ne_mount; 381 *wh = np->netc_exflags; 382 *anon = np->netc_anon; 383 384 return 0; 385 } 386 387 #ifdef COMPAT_30 388 /* 389 * Handles legacy export requests. In this case, the export information 390 * is hardcoded in a specific place of the mount arguments structure (given 391 * in data); the request for an update is given through the fspec field 392 * (also in a known location), which must be a null pointer. 393 * 394 * Returns EJUSTRETURN if the given command was not a export request. 395 * Otherwise, returns 0 on success or an appropriate error code otherwise. 396 */ 397 int 398 nfs_update_exports_30(struct mount *mp, const char *path, void *data, 399 struct lwp *l) 400 { 401 int error; 402 struct { 403 const char *fspec; 404 struct export_args30 eargs; 405 } args; 406 struct mountd_exports_list mel; 407 408 mel.mel_path = path; 409 410 error = copyin(data, &args, sizeof(args)); 411 if (error != 0) 412 return EJUSTRETURN; 413 414 if (args.fspec != NULL) 415 return EJUSTRETURN; 416 417 if (args.eargs.ex_flags & 0x00020000) { 418 /* Request to delete exports. The mask above holds the 419 * value that used to be in MNT_DELEXPORT. */ 420 mel.mel_nexports = 0; 421 } else { 422 struct export_args eargs; 423 424 /* The following assumes export_args has not changed since 425 * export_args30. */ 426 memcpy(&eargs, &args.eargs, sizeof(struct export_args)); 427 428 mel.mel_nexports = 1; 429 mel.mel_exports = &eargs; 430 } 431 432 return mountd_set_exports_list(&mel, l); 433 } 434 #endif 435 436 /* 437 * INTERNAL FUNCTIONS 438 */ 439 440 /* 441 * Initializes NFS exports for the file system given in 'mp' if it supports 442 * file handles; this is determined by checking whether mp's vfs_vptofh and 443 * vfs_fhtovp operations are NULL or not. 444 * 445 * If successful, returns 0 and sets *mnpp to the address of the new 446 * mount_netexport_pair item; otherwise returns and appropriate error code 447 * and *mnpp remains unmodified. 448 */ 449 static int 450 init_exports(struct mount *mp, struct netexport **nep) 451 { 452 int error; 453 struct export_args ea; 454 struct netexport *ne; 455 456 KASSERT(mp != NULL); 457 KASSERT(mp->mnt_op->vfs_vptofh != NULL && 458 mp->mnt_op->vfs_fhtovp != NULL); 459 460 /* Ensure that we do not already have this mount point. */ 461 KASSERT(netexport_lookup(mp) == NULL); 462 463 ne = malloc(sizeof(*ne), M_NFS_EXPORT, M_WAITOK | M_ZERO); 464 ne->ne_mount = mp; 465 466 /* Set the default export entry. Handled internally by export upon 467 * first call. */ 468 memset(&ea, 0, sizeof(ea)); 469 ea.ex_root = -2; 470 if (mp->mnt_flag & MNT_RDONLY) 471 ea.ex_flags |= MNT_EXRDONLY; 472 error = export(ne, &ea); 473 if (error != 0) { 474 free(ne, M_NFS_EXPORT); 475 } else { 476 netexport_insert(ne); 477 *nep = ne; 478 } 479 480 return error; 481 } 482 483 /* 484 * Build hash lists of net addresses and hang them off the mount point. 485 * Called by export() to set up a new entry in the lists of export 486 * addresses. 487 */ 488 static int 489 hang_addrlist(struct mount *mp, struct netexport *nep, 490 const struct export_args *argp) 491 { 492 int error, i; 493 struct netcred *np, *enp; 494 struct radix_node_head *rnh; 495 struct sockaddr *saddr, *smask; 496 struct domain *dom; 497 498 smask = NULL; 499 500 if (argp->ex_addrlen == 0) { 501 if (mp->mnt_flag & MNT_DEFEXPORTED) 502 return EPERM; 503 np = &nep->ne_defexported; 504 np->netc_exflags = argp->ex_flags; 505 if (np->netc_anon == NULL) /* XXX elad */ 506 np->netc_anon = kauth_cred_alloc(); 507 kauth_cred_uucvt(np->netc_anon, &argp->ex_anon); 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 if (np->netc_anon == NULL) /* XXX elad */ 575 np->netc_anon = kauth_cred_alloc(); 576 kauth_cred_uucvt(np->netc_anon, &argp->ex_anon); 577 return 0; 578 check: 579 if (enp->netc_exflags != argp->ex_flags || 580 kauth_cred_uucmp(enp->netc_anon, &argp->ex_anon) != 0) 581 error = EPERM; 582 else 583 error = 0; 584 out: 585 free(np, M_NETADDR); 586 return error; 587 } 588 589 /* 590 * Ensure that the address stored in 'sa' is valid. 591 * Returns zero on success, otherwise -1. 592 */ 593 static int 594 sacheck(struct sockaddr *sa) 595 { 596 597 switch (sa->sa_family) { 598 #ifdef INET 599 case AF_INET: { 600 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 601 char *p = (char *)sin->sin_zero; 602 size_t i; 603 604 if (sin->sin_len != sizeof(*sin)) 605 return -1; 606 if (sin->sin_port != 0) 607 return -1; 608 for (i = 0; i < sizeof(sin->sin_zero); i++) 609 if (*p++ != '\0') 610 return -1; 611 return 0; 612 } 613 #endif 614 #ifdef INET6 615 case AF_INET6: { 616 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 617 618 if (sin6->sin6_len != sizeof(*sin6)) 619 return -1; 620 if (sin6->sin6_port != 0) 621 return -1; 622 return 0; 623 } 624 #endif 625 default: 626 return -1; 627 } 628 } 629 630 /* 631 * Free the netcred object pointed to by the 'rn' radix node. 632 * 'w' holds a pointer to the radix tree head. 633 */ 634 static int 635 free_netcred(struct radix_node *rn, void *w) 636 { 637 struct radix_node_head *rnh = (struct radix_node_head *)w; 638 struct netcred *np = (struct netcred *)(void *)rn; 639 640 (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh); 641 if (--(np->netc_refcnt) <= 0) 642 free(np, M_NETADDR); 643 return 0; 644 } 645 646 /* 647 * Clears the exports list for a given file system. 648 */ 649 static void 650 netexport_clear(struct netexport *ne) 651 { 652 struct radix_node_head *rnh; 653 struct mount *mp = ne->ne_mount; 654 int i; 655 656 if (mp->mnt_flag & MNT_EXPUBLIC) { 657 setpublicfs(NULL, NULL, NULL); 658 mp->mnt_flag &= ~MNT_EXPUBLIC; 659 } 660 661 for (i = 0; i <= AF_MAX; i++) { 662 if ((rnh = ne->ne_rtable[i]) != NULL) { 663 (*rnh->rnh_walktree)(rnh, free_netcred, rnh); 664 free(rnh, M_RTABLE); 665 ne->ne_rtable[i] = NULL; 666 } 667 } 668 669 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 670 } 671 672 /* 673 * Add a new export entry (described by an export_args structure) to the 674 * given file system. 675 */ 676 static int 677 export(struct netexport *nep, const struct export_args *argp) 678 { 679 struct mount *mp = nep->ne_mount; 680 int error; 681 682 if (argp->ex_flags & MNT_EXPORTED) { 683 if (argp->ex_flags & MNT_EXPUBLIC) { 684 if ((error = setpublicfs(mp, nep, argp)) != 0) 685 return error; 686 mp->mnt_flag |= MNT_EXPUBLIC; 687 } 688 if ((error = hang_addrlist(mp, nep, argp)) != 0) 689 return error; 690 mp->mnt_flag |= MNT_EXPORTED; 691 } 692 return 0; 693 } 694 695 /* 696 * Set the publicly exported filesystem (WebNFS). Currently, only 697 * one public filesystem is possible in the spec (RFC 2054 and 2055) 698 */ 699 static int 700 setpublicfs(struct mount *mp, struct netexport *nep, 701 const struct export_args *argp) 702 { 703 char *cp; 704 int error; 705 struct vnode *rvp; 706 707 /* 708 * mp == NULL -> invalidate the current info, the FS is 709 * no longer exported. May be called from either export 710 * or unmount, so check if it hasn't already been done. 711 */ 712 if (mp == NULL) { 713 if (nfs_pub.np_valid) { 714 nfs_pub.np_valid = 0; 715 if (nfs_pub.np_index != NULL) { 716 FREE(nfs_pub.np_index, M_TEMP); 717 nfs_pub.np_index = NULL; 718 } 719 } 720 return 0; 721 } 722 723 /* 724 * Only one allowed at a time. 725 */ 726 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 727 return EBUSY; 728 729 /* 730 * Get real filehandle for root of exported FS. 731 */ 732 memset((caddr_t)&nfs_pub.np_handle, 0, sizeof(nfs_pub.np_handle)); 733 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsidx; 734 735 if ((error = VFS_ROOT(mp, &rvp))) 736 return error; 737 738 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 739 return error; 740 741 vput(rvp); 742 KASSERT(nfs_pub.np_handle.fh_fid.fid_len <= _VFS_MAXFIDSZ); 743 744 /* 745 * If an indexfile was specified, pull it in. 746 */ 747 if (argp->ex_indexfile != NULL) { 748 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 749 M_WAITOK); 750 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 751 MAXNAMLEN, (size_t *)0); 752 if (!error) { 753 /* 754 * Check for illegal filenames. 755 */ 756 for (cp = nfs_pub.np_index; *cp; cp++) { 757 if (*cp == '/') { 758 error = EINVAL; 759 break; 760 } 761 } 762 } 763 if (error) { 764 FREE(nfs_pub.np_index, M_TEMP); 765 return error; 766 } 767 } 768 769 nfs_pub.np_mount = mp; 770 nfs_pub.np_valid = 1; 771 return 0; 772 } 773 774 /* 775 * Lookup an export entry in the exports list that matches the address 776 * stored in 'nam'. If no entry is found, the default one is used instead 777 * (if available). 778 */ 779 static struct netcred * 780 netcred_lookup(struct netexport *ne, struct mbuf *nam) 781 { 782 struct netcred *np; 783 struct radix_node_head *rnh; 784 struct sockaddr *saddr; 785 786 if ((ne->ne_mount->mnt_flag & MNT_EXPORTED) == 0) { 787 return NULL; 788 } 789 790 /* 791 * Lookup in the export list first. 792 */ 793 np = NULL; 794 if (nam != NULL) { 795 saddr = mtod(nam, struct sockaddr *); 796 rnh = ne->ne_rtable[saddr->sa_family]; 797 if (rnh != NULL) { 798 np = (struct netcred *) 799 (*rnh->rnh_matchaddr)((caddr_t)saddr, 800 rnh); 801 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 802 np = NULL; 803 } 804 } 805 /* 806 * If no address match, use the default if it exists. 807 */ 808 if (np == NULL && ne->ne_mount->mnt_flag & MNT_DEFEXPORTED) 809 np = &ne->ne_defexported; 810 811 return np; 812 } 813 814 static struct lock netexport_lock = LOCK_INITIALIZER(PVFS, "netexp", 0, 0); 815 816 void 817 netexport_rdlock(void) 818 { 819 820 lockmgr(&netexport_lock, LK_SHARED, NULL); 821 } 822 823 void 824 netexport_rdunlock(void) 825 { 826 827 lockmgr(&netexport_lock, LK_RELEASE, NULL); 828 } 829 830 static void 831 netexport_wrlock(void) 832 { 833 834 lockmgr(&netexport_lock, LK_EXCLUSIVE, NULL); 835 } 836 837 static void 838 netexport_wrunlock(void) 839 { 840 841 lockmgr(&netexport_lock, LK_RELEASE, NULL); 842 } 843
Indexes created Tue Sep 23 22:09:46 GMT 2025