1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/dirent.h> 44 #include <sys/jail.h> 45 #include <sys/kernel.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/mount.h> 50 #include <sys/mutex.h> 51 #include <sys/proc.h> 52 #include <sys/rmlock.h> 53 #include <sys/refcount.h> 54 #include <sys/signalvar.h> 55 #include <sys/socket.h> 56 #include <sys/vnode.h> 57 58 #include <netinet/in.h> 59 #include <net/radix.h> 60 61 #include <rpc/types.h> 62 #include <rpc/auth.h> 63 64 static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure"); 65 66 #if defined(INET) || defined(INET6) 67 static struct radix_node_head *vfs_create_addrlist_af( 68 struct radix_node_head **prnh, int off); 69 #endif 70 static int vfs_free_netcred(struct radix_node *rn, void *w); 71 static void vfs_free_addrlist_af(struct radix_node_head **prnh); 72 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 73 struct export_args *argp); 74 static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *); 75 76 /* 77 * Network address lookup element 78 */ 79 struct netcred { 80 struct radix_node netc_rnodes[2]; 81 uint64_t netc_exflags; 82 struct ucred *netc_anon; 83 int netc_numsecflavors; 84 int netc_secflavors[MAXSECFLAVORS]; 85 }; 86 87 /* 88 * Network export information 89 */ 90 struct netexport { 91 struct netcred ne_defexported; /* Default export */ 92 struct radix_node_head *ne4; 93 struct radix_node_head *ne6; 94 }; 95 96 /* 97 * Build hash lists of net addresses and hang them off the mount point. 98 * Called by vfs_export() to set up the lists of export addresses. 99 */ 100 static int 101 vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 102 struct export_args *argp) 103 { 104 struct netcred *np; 105 struct radix_node_head *rnh; 106 int i; 107 struct radix_node *rn; 108 struct sockaddr *saddr, *smask = NULL; 109 #if defined(INET6) || defined(INET) 110 int off; 111 #endif 112 int error; 113 114 KASSERT(argp->ex_numsecflavors > 0, 115 ("%s: numsecflavors <= 0", __func__)); 116 KASSERT(argp->ex_numsecflavors < MAXSECFLAVORS, 117 ("%s: numsecflavors >= MAXSECFLAVORS", __func__)); 118 119 /* 120 * XXX: This routine converts from a uid plus gid list 121 * to a `struct ucred' (np->netc_anon). This 122 * operation is questionable; for example, what should be done 123 * with fields like cr_uidinfo and cr_prison? Currently, this 124 * routine does not touch them (leaves them as NULL). 125 */ 126 if (argp->ex_addrlen == 0) { 127 if (mp->mnt_flag & MNT_DEFEXPORTED) { 128 vfs_mount_error(mp, 129 "MNT_DEFEXPORTED already set for mount %p", mp); 130 return (EPERM); 131 } 132 np = &nep->ne_defexported; 133 np->netc_exflags = argp->ex_flags; 134 np->netc_anon = crget(); 135 np->netc_anon->cr_uid = argp->ex_uid; 136 crsetgroups(np->netc_anon, argp->ex_ngroups, 137 argp->ex_groups); 138 np->netc_anon->cr_prison = &prison0; 139 prison_hold(np->netc_anon->cr_prison); 140 np->netc_numsecflavors = argp->ex_numsecflavors; 141 bcopy(argp->ex_secflavors, np->netc_secflavors, 142 sizeof(np->netc_secflavors)); 143 MNT_ILOCK(mp); 144 mp->mnt_flag |= MNT_DEFEXPORTED; 145 MNT_IUNLOCK(mp); 146 return (0); 147 } 148 149 #if MSIZE <= 256 150 if (argp->ex_addrlen > MLEN) { 151 vfs_mount_error(mp, "ex_addrlen %d is greater than %d", 152 argp->ex_addrlen, MLEN); 153 return (EINVAL); 154 } 155 #endif 156 157 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 158 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO); 159 saddr = (struct sockaddr *) (np + 1); 160 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen))) 161 goto out; 162 if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) { 163 error = EINVAL; 164 vfs_mount_error(mp, "Invalid saddr->sa_family: %d"); 165 goto out; 166 } 167 if (saddr->sa_len > argp->ex_addrlen) 168 saddr->sa_len = argp->ex_addrlen; 169 if (argp->ex_masklen) { 170 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 171 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 172 if (error) 173 goto out; 174 if (smask->sa_len > argp->ex_masklen) 175 smask->sa_len = argp->ex_masklen; 176 } 177 rnh = NULL; 178 switch (saddr->sa_family) { 179 #ifdef INET 180 case AF_INET: 181 if ((rnh = nep->ne4) == NULL) { 182 off = offsetof(struct sockaddr_in, sin_addr) << 3; 183 rnh = vfs_create_addrlist_af(&nep->ne4, off); 184 } 185 break; 186 #endif 187 #ifdef INET6 188 case AF_INET6: 189 if ((rnh = nep->ne6) == NULL) { 190 off = offsetof(struct sockaddr_in6, sin6_addr) << 3; 191 rnh = vfs_create_addrlist_af(&nep->ne6, off); 192 } 193 break; 194 #endif 195 } 196 if (rnh == NULL) { 197 error = ENOBUFS; 198 vfs_mount_error(mp, "%s %s %d", 199 "Unable to initialize radix node head ", 200 "for address family", saddr->sa_family); 201 goto out; 202 } 203 RADIX_NODE_HEAD_LOCK(rnh); 204 rn = (*rnh->rnh_addaddr)(saddr, smask, &rnh->rh, np->netc_rnodes); 205 RADIX_NODE_HEAD_UNLOCK(rnh); 206 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */ 207 error = EPERM; 208 vfs_mount_error(mp, 209 "netcred already exists for given addr/mask"); 210 goto out; 211 } 212 np->netc_exflags = argp->ex_flags; 213 np->netc_anon = crget(); 214 np->netc_anon->cr_uid = argp->ex_uid; 215 crsetgroups(np->netc_anon, argp->ex_ngroups, 216 argp->ex_groups); 217 np->netc_anon->cr_prison = &prison0; 218 prison_hold(np->netc_anon->cr_prison); 219 np->netc_numsecflavors = argp->ex_numsecflavors; 220 bcopy(argp->ex_secflavors, np->netc_secflavors, 221 sizeof(np->netc_secflavors)); 222 return (0); 223 out: 224 free(np, M_NETADDR); 225 return (error); 226 } 227 228 /* Helper for vfs_free_addrlist. */ 229 /* ARGSUSED */ 230 static int 231 vfs_free_netcred(struct radix_node *rn, void *w) 232 { 233 struct radix_node_head *rnh = (struct radix_node_head *) w; 234 struct ucred *cred; 235 236 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, &rnh->rh); 237 cred = ((struct netcred *)rn)->netc_anon; 238 if (cred != NULL) 239 crfree(cred); 240 free(rn, M_NETADDR); 241 return (0); 242 } 243 244 #if defined(INET) || defined(INET6) 245 static struct radix_node_head * 246 vfs_create_addrlist_af(struct radix_node_head **prnh, int off) 247 { 248 249 if (rn_inithead((void **)prnh, off) == 0) 250 return (NULL); 251 RADIX_NODE_HEAD_LOCK_INIT(*prnh); 252 return (*prnh); 253 } 254 #endif 255 256 static void 257 vfs_free_addrlist_af(struct radix_node_head **prnh) 258 { 259 struct radix_node_head *rnh; 260 261 rnh = *prnh; 262 RADIX_NODE_HEAD_LOCK(rnh); 263 (*rnh->rnh_walktree)(&rnh->rh, vfs_free_netcred, rnh); 264 RADIX_NODE_HEAD_UNLOCK(rnh); 265 RADIX_NODE_HEAD_DESTROY(rnh); 266 rn_detachhead((void **)prnh); 267 prnh = NULL; 268 } 269 270 /* 271 * Free the net address hash lists that are hanging off the mount points. 272 */ 273 void 274 vfs_free_addrlist(struct netexport *nep) 275 { 276 struct ucred *cred; 277 278 if (nep->ne4 != NULL) 279 vfs_free_addrlist_af(&nep->ne4); 280 if (nep->ne6 != NULL) 281 vfs_free_addrlist_af(&nep->ne6); 282 283 cred = nep->ne_defexported.netc_anon; 284 if (cred != NULL) { 285 crfree(cred); 286 nep->ne_defexported.netc_anon = NULL; 287 } 288 289 } 290 291 /* 292 * High level function to manipulate export options on a mount point 293 * and the passed in netexport. 294 * Struct export_args *argp is the variable used to twiddle options, 295 * the structure is described in sys/mount.h 296 * The do_exjail argument should be true if *mp is in the mountlist 297 * and false if not. It is not in the mountlist for the NFSv4 rootfs 298 * fake mount point just used for exports. 299 */ 300 int 301 vfs_export(struct mount *mp, struct export_args *argp, bool do_exjail) 302 { 303 struct netexport *nep; 304 struct ucred *cr; 305 struct prison *pr; 306 int error; 307 bool new_nep; 308 309 if ((argp->ex_flags & (MNT_DELEXPORT | MNT_EXPORTED)) == 0) 310 return (EINVAL); 311 312 if ((argp->ex_flags & MNT_EXPORTED) != 0 && 313 (argp->ex_numsecflavors < 0 314 || argp->ex_numsecflavors >= MAXSECFLAVORS)) 315 return (EINVAL); 316 317 error = 0; 318 pr = curthread->td_ucred->cr_prison; 319 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL); 320 nep = mp->mnt_export; 321 if (argp->ex_flags & MNT_DELEXPORT) { 322 if (nep == NULL) { 323 error = ENOENT; 324 goto out; 325 } 326 MNT_ILOCK(mp); 327 if (mp->mnt_exjail != NULL && mp->mnt_exjail->cr_prison != pr && 328 pr == &prison0) { 329 MNT_IUNLOCK(mp); 330 /* EXDEV will not get logged by mountd(8). */ 331 error = EXDEV; 332 goto out; 333 } else if (mp->mnt_exjail != NULL && 334 mp->mnt_exjail->cr_prison != pr) { 335 MNT_IUNLOCK(mp); 336 /* EPERM will get logged by mountd(8). */ 337 error = EPERM; 338 goto out; 339 } 340 MNT_IUNLOCK(mp); 341 if (mp->mnt_flag & MNT_EXPUBLIC) { 342 vfs_setpublicfs(NULL, NULL, NULL); 343 MNT_ILOCK(mp); 344 mp->mnt_flag &= ~MNT_EXPUBLIC; 345 MNT_IUNLOCK(mp); 346 } 347 vfs_free_addrlist(nep); 348 mp->mnt_export = NULL; 349 free(nep, M_MOUNT); 350 nep = NULL; 351 MNT_ILOCK(mp); 352 cr = mp->mnt_exjail; 353 mp->mnt_exjail = NULL; 354 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 355 MNT_IUNLOCK(mp); 356 if (cr != NULL) { 357 atomic_subtract_int(&pr->pr_exportcnt, 1); 358 crfree(cr); 359 } 360 } 361 if (argp->ex_flags & MNT_EXPORTED) { 362 new_nep = false; 363 MNT_ILOCK(mp); 364 if (mp->mnt_exjail == NULL) { 365 MNT_IUNLOCK(mp); 366 if (do_exjail && nep != NULL) { 367 vfs_free_addrlist(nep); 368 memset(nep, 0, sizeof(*nep)); 369 new_nep = true; 370 } 371 } else if (mp->mnt_exjail->cr_prison != pr) { 372 MNT_IUNLOCK(mp); 373 error = EPERM; 374 goto out; 375 } else 376 MNT_IUNLOCK(mp); 377 if (nep == NULL) { 378 nep = malloc(sizeof(struct netexport), M_MOUNT, 379 M_WAITOK | M_ZERO); 380 mp->mnt_export = nep; 381 new_nep = true; 382 } 383 if (argp->ex_flags & MNT_EXPUBLIC) { 384 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) { 385 if (new_nep) { 386 mp->mnt_export = NULL; 387 free(nep, M_MOUNT); 388 } 389 goto out; 390 } 391 new_nep = false; 392 MNT_ILOCK(mp); 393 if (do_exjail && mp->mnt_exjail == NULL) { 394 mp->mnt_exjail = crhold(curthread->td_ucred); 395 atomic_add_int(&pr->pr_exportcnt, 1); 396 } 397 mp->mnt_flag |= MNT_EXPUBLIC; 398 MNT_IUNLOCK(mp); 399 } 400 if (argp->ex_numsecflavors == 0) { 401 argp->ex_numsecflavors = 1; 402 argp->ex_secflavors[0] = AUTH_SYS; 403 } 404 if ((error = vfs_hang_addrlist(mp, nep, argp))) { 405 if (new_nep) { 406 mp->mnt_export = NULL; 407 free(nep, M_MOUNT); 408 } 409 goto out; 410 } 411 MNT_ILOCK(mp); 412 if (do_exjail && mp->mnt_exjail == NULL) { 413 mp->mnt_exjail = crhold(curthread->td_ucred); 414 atomic_add_int(&pr->pr_exportcnt, 1); 415 } 416 mp->mnt_flag |= MNT_EXPORTED; 417 MNT_IUNLOCK(mp); 418 } 419 420 out: 421 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); 422 /* 423 * Once we have executed the vfs_export() command, we do 424 * not want to keep the "export" option around in the 425 * options list, since that will cause subsequent MNT_UPDATE 426 * calls to fail. The export information is saved in 427 * mp->mnt_export, so we can safely delete the "export" mount option 428 * here. 429 */ 430 vfs_deleteopt(mp->mnt_optnew, "export"); 431 vfs_deleteopt(mp->mnt_opt, "export"); 432 return (error); 433 } 434 435 /* 436 * Get rid of credential references for this prison. 437 */ 438 void 439 vfs_exjail_delete(struct prison *pr) 440 { 441 struct mount *mp; 442 struct ucred *cr; 443 int error, i; 444 445 /* 446 * Since this function is called from prison_cleanup() after 447 * all processes in the prison have exited, the value of 448 * pr_exportcnt can no longer increase. It is possible for 449 * a dismount of a file system exported within this prison 450 * to be in progress. In this case, the file system is no 451 * longer in the mountlist and the mnt_exjail will be free'd 452 * by vfs_mount_destroy() at some time. As such, pr_exportcnt 453 * and, therefore "i", is the upper bound on the number of 454 * mnt_exjail entries to be found by this function. 455 */ 456 i = atomic_load_int(&pr->pr_exportcnt); 457 KASSERT(i >= 0, ("vfs_exjail_delete: pr_exportcnt negative")); 458 if (i == 0) 459 return; 460 mtx_lock(&mountlist_mtx); 461 tryagain: 462 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 463 MNT_ILOCK(mp); 464 if (mp->mnt_exjail != NULL && 465 mp->mnt_exjail->cr_prison == pr) { 466 MNT_IUNLOCK(mp); 467 error = vfs_busy(mp, MBF_MNTLSTLOCK | MBF_NOWAIT); 468 if (error != 0) { 469 /* 470 * If the vfs_busy() fails, we still want to 471 * get rid of mnt_exjail for two reasons: 472 * - a credential reference will result in 473 * a prison not being removed 474 * - setting mnt_exjail NULL indicates that 475 * the exports are no longer valid 476 * The now invalid exports will be deleted 477 * when the file system is dismounted or 478 * the file system is re-exported by mountd. 479 */ 480 cr = NULL; 481 MNT_ILOCK(mp); 482 if (mp->mnt_exjail != NULL && 483 mp->mnt_exjail->cr_prison == pr) { 484 cr = mp->mnt_exjail; 485 mp->mnt_exjail = NULL; 486 } 487 MNT_IUNLOCK(mp); 488 if (cr != NULL) { 489 crfree(cr); 490 i--; 491 } 492 if (i == 0) 493 break; 494 continue; 495 } 496 cr = NULL; 497 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL); 498 MNT_ILOCK(mp); 499 if (mp->mnt_exjail != NULL && 500 mp->mnt_exjail->cr_prison == pr) { 501 cr = mp->mnt_exjail; 502 mp->mnt_exjail = NULL; 503 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 504 MNT_IUNLOCK(mp); 505 vfs_free_addrlist(mp->mnt_export); 506 free(mp->mnt_export, M_MOUNT); 507 mp->mnt_export = NULL; 508 } else 509 MNT_IUNLOCK(mp); 510 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); 511 if (cr != NULL) { 512 crfree(cr); 513 i--; 514 } 515 mtx_lock(&mountlist_mtx); 516 vfs_unbusy(mp); 517 if (i == 0) 518 break; 519 goto tryagain; 520 } 521 MNT_IUNLOCK(mp); 522 } 523 mtx_unlock(&mountlist_mtx); 524 } 525 526 /* 527 * Set the publicly exported filesystem (WebNFS). Currently, only 528 * one public filesystem is possible in the spec (RFC 2054 and 2055) 529 */ 530 int 531 vfs_setpublicfs(struct mount *mp, struct netexport *nep, 532 struct export_args *argp) 533 { 534 int error; 535 struct vnode *rvp; 536 char *cp; 537 538 /* 539 * mp == NULL -> invalidate the current info, the FS is 540 * no longer exported. May be called from either vfs_export 541 * or unmount, so check if it hasn't already been done. 542 */ 543 if (mp == NULL) { 544 if (nfs_pub.np_valid) { 545 nfs_pub.np_valid = 0; 546 if (nfs_pub.np_index != NULL) { 547 free(nfs_pub.np_index, M_TEMP); 548 nfs_pub.np_index = NULL; 549 } 550 } 551 return (0); 552 } 553 554 /* 555 * Only one allowed at a time. 556 */ 557 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 558 return (EBUSY); 559 560 /* 561 * Get real filehandle for root of exported FS. 562 */ 563 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); 564 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; 565 566 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp))) 567 return (error); 568 569 if ((error = VOP_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 570 return (error); 571 572 vput(rvp); 573 574 /* 575 * If an indexfile was specified, pull it in. 576 */ 577 if (argp->ex_indexfile != NULL) { 578 if (nfs_pub.np_index == NULL) 579 nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP, 580 M_WAITOK); 581 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 582 MAXNAMLEN, (size_t *)0); 583 if (!error) { 584 /* 585 * Check for illegal filenames. 586 */ 587 for (cp = nfs_pub.np_index; *cp; cp++) { 588 if (*cp == '/') { 589 error = EINVAL; 590 break; 591 } 592 } 593 } 594 if (error) { 595 free(nfs_pub.np_index, M_TEMP); 596 nfs_pub.np_index = NULL; 597 return (error); 598 } 599 } 600 601 nfs_pub.np_mount = mp; 602 nfs_pub.np_valid = 1; 603 return (0); 604 } 605 606 /* 607 * Used by the filesystems to determine if a given network address 608 * (passed in 'nam') is present in their exports list, returns a pointer 609 * to struct netcred so that the filesystem can examine it for 610 * access rights (read/write/etc). 611 */ 612 static struct netcred * 613 vfs_export_lookup(struct mount *mp, struct sockaddr *nam) 614 { 615 RADIX_NODE_HEAD_RLOCK_TRACKER; 616 struct netexport *nep; 617 struct netcred *np = NULL; 618 struct radix_node_head *rnh; 619 struct sockaddr *saddr; 620 621 nep = mp->mnt_export; 622 if (nep == NULL) 623 return (NULL); 624 if ((mp->mnt_flag & MNT_EXPORTED) == 0) 625 return (NULL); 626 627 /* 628 * Lookup in the export list 629 */ 630 if (nam != NULL) { 631 saddr = nam; 632 rnh = NULL; 633 switch (saddr->sa_family) { 634 case AF_INET: 635 rnh = nep->ne4; 636 break; 637 case AF_INET6: 638 rnh = nep->ne6; 639 break; 640 } 641 if (rnh != NULL) { 642 RADIX_NODE_HEAD_RLOCK(rnh); 643 np = (struct netcred *) (*rnh->rnh_matchaddr)(saddr, &rnh->rh); 644 RADIX_NODE_HEAD_RUNLOCK(rnh); 645 if (np != NULL && (np->netc_rnodes->rn_flags & RNF_ROOT) != 0) 646 return (NULL); 647 } 648 } 649 650 /* 651 * If no address match, use the default if it exists. 652 */ 653 if (np == NULL && (mp->mnt_flag & MNT_DEFEXPORTED) != 0) 654 return (&nep->ne_defexported); 655 656 return (np); 657 } 658 659 /* 660 * XXX: This comment comes from the deprecated ufs_check_export() 661 * XXX: and may not entirely apply, but lacking something better: 662 * This is the generic part of fhtovp called after the underlying 663 * filesystem has validated the file handle. 664 * 665 * Verify that a host should have access to a filesystem. 666 */ 667 668 int 669 vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, uint64_t *extflagsp, 670 struct ucred **credanonp, int *numsecflavors, int *secflavors) 671 { 672 struct netcred *np; 673 674 lockmgr(&mp->mnt_explock, LK_SHARED, NULL); 675 np = vfs_export_lookup(mp, nam); 676 if (np == NULL) { 677 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); 678 *credanonp = NULL; 679 return (EACCES); 680 } 681 *extflagsp = np->netc_exflags; 682 if ((*credanonp = np->netc_anon) != NULL) 683 crhold(*credanonp); 684 if (numsecflavors) { 685 *numsecflavors = np->netc_numsecflavors; 686 KASSERT(*numsecflavors > 0, 687 ("%s: numsecflavors <= 0", __func__)); 688 KASSERT(*numsecflavors < MAXSECFLAVORS, 689 ("%s: numsecflavors >= MAXSECFLAVORS", __func__)); 690 } 691 if (secflavors && np->netc_numsecflavors > 0) 692 memcpy(secflavors, np->netc_secflavors, np->netc_numsecflavors * 693 sizeof(int)); 694 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); 695 return (0); 696 } 697