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/conf.h> 44 #include <sys/dirent.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/mount.h> 51 #include <sys/mutex.h> 52 #include <sys/proc.h> 53 #include <sys/rmlock.h> 54 #include <sys/refcount.h> 55 #include <sys/signalvar.h> 56 #include <sys/socket.h> 57 #include <sys/vnode.h> 58 59 #include <netinet/in.h> 60 #include <net/radix.h> 61 62 #include <rpc/types.h> 63 #include <rpc/auth.h> 64 65 static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure"); 66 67 #if defined(INET) || defined(INET6) 68 static struct radix_node_head *vfs_create_addrlist_af( 69 struct radix_node_head **prnh, int off); 70 #endif 71 static int vfs_free_netcred(struct radix_node *rn, void *w); 72 static void vfs_free_addrlist_af(struct radix_node_head **prnh); 73 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 74 struct export_args *argp); 75 static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *); 76 77 /* 78 * Network address lookup element 79 */ 80 struct netcred { 81 struct radix_node netc_rnodes[2]; 82 uint64_t netc_exflags; 83 struct ucred *netc_anon; 84 int netc_numsecflavors; 85 int netc_secflavors[MAXSECFLAVORS]; 86 }; 87 88 /* 89 * Network export information 90 */ 91 struct netexport { 92 struct netcred ne_defexported; /* Default export */ 93 struct radix_node_head *ne4; 94 struct radix_node_head *ne6; 95 }; 96 97 /* 98 * Build hash lists of net addresses and hang them off the mount point. 99 * Called by vfs_export() to set up the lists of export addresses. 100 */ 101 static int 102 vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 103 struct export_args *argp) 104 { 105 struct netcred *np; 106 struct radix_node_head *rnh; 107 int i; 108 struct radix_node *rn; 109 struct sockaddr *saddr, *smask = NULL; 110 #if defined(INET6) || defined(INET) 111 int off; 112 #endif 113 int error; 114 115 KASSERT(argp->ex_numsecflavors > 0, 116 ("%s: numsecflavors <= 0", __func__)); 117 KASSERT(argp->ex_numsecflavors < MAXSECFLAVORS, 118 ("%s: numsecflavors >= MAXSECFLAVORS", __func__)); 119 120 /* 121 * XXX: This routine converts from a uid plus gid list 122 * to a `struct ucred' (np->netc_anon). This 123 * operation is questionable; for example, what should be done 124 * with fields like cr_uidinfo and cr_prison? Currently, this 125 * routine does not touch them (leaves them as NULL). 126 */ 127 if (argp->ex_addrlen == 0) { 128 if (mp->mnt_flag & MNT_DEFEXPORTED) { 129 vfs_mount_error(mp, 130 "MNT_DEFEXPORTED already set for mount %p", mp); 131 return (EPERM); 132 } 133 np = &nep->ne_defexported; 134 np->netc_exflags = argp->ex_flags; 135 np->netc_anon = crget(); 136 np->netc_anon->cr_uid = argp->ex_uid; 137 crsetgroups_fallback(np->netc_anon, argp->ex_ngroups, 138 argp->ex_groups, GID_NOGROUP); 139 np->netc_anon->cr_prison = &prison0; 140 prison_hold(np->netc_anon->cr_prison); 141 np->netc_numsecflavors = argp->ex_numsecflavors; 142 bcopy(argp->ex_secflavors, np->netc_secflavors, 143 sizeof(np->netc_secflavors)); 144 MNT_ILOCK(mp); 145 mp->mnt_flag |= MNT_DEFEXPORTED; 146 MNT_IUNLOCK(mp); 147 return (0); 148 } 149 150 #if MSIZE <= 256 151 if (argp->ex_addrlen > MLEN) { 152 vfs_mount_error(mp, "ex_addrlen %d is greater than %d", 153 argp->ex_addrlen, MLEN); 154 return (EINVAL); 155 } 156 #endif 157 158 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 159 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO); 160 saddr = (struct sockaddr *) (np + 1); 161 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen))) 162 goto out; 163 if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) { 164 error = EINVAL; 165 vfs_mount_error(mp, "Invalid saddr->sa_family: %d"); 166 goto out; 167 } 168 if (saddr->sa_len > argp->ex_addrlen) 169 saddr->sa_len = argp->ex_addrlen; 170 if (argp->ex_masklen) { 171 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 172 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 173 if (error) 174 goto out; 175 if (smask->sa_len > argp->ex_masklen) 176 smask->sa_len = argp->ex_masklen; 177 } 178 rnh = NULL; 179 switch (saddr->sa_family) { 180 #ifdef INET 181 case AF_INET: 182 if ((rnh = nep->ne4) == NULL) { 183 off = offsetof(struct sockaddr_in, sin_addr) << 3; 184 rnh = vfs_create_addrlist_af(&nep->ne4, off); 185 } 186 break; 187 #endif 188 #ifdef INET6 189 case AF_INET6: 190 if ((rnh = nep->ne6) == NULL) { 191 off = offsetof(struct sockaddr_in6, sin6_addr) << 3; 192 rnh = vfs_create_addrlist_af(&nep->ne6, off); 193 } 194 break; 195 #endif 196 } 197 if (rnh == NULL) { 198 error = ENOBUFS; 199 vfs_mount_error(mp, "%s %s %d", 200 "Unable to initialize radix node head ", 201 "for address family", saddr->sa_family); 202 goto out; 203 } 204 RADIX_NODE_HEAD_LOCK(rnh); 205 rn = (*rnh->rnh_addaddr)(saddr, smask, &rnh->rh, np->netc_rnodes); 206 RADIX_NODE_HEAD_UNLOCK(rnh); 207 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */ 208 error = EPERM; 209 vfs_mount_error(mp, 210 "netcred already exists for given addr/mask"); 211 goto out; 212 } 213 np->netc_exflags = argp->ex_flags; 214 np->netc_anon = crget(); 215 np->netc_anon->cr_uid = argp->ex_uid; 216 crsetgroups_fallback(np->netc_anon, argp->ex_ngroups, argp->ex_groups, 217 GID_NOGROUP); 218 np->netc_anon->cr_prison = &prison0; 219 prison_hold(np->netc_anon->cr_prison); 220 np->netc_numsecflavors = argp->ex_numsecflavors; 221 bcopy(argp->ex_secflavors, np->netc_secflavors, 222 sizeof(np->netc_secflavors)); 223 return (0); 224 out: 225 free(np, M_NETADDR); 226 return (error); 227 } 228 229 /* Helper for vfs_free_addrlist. */ 230 /* ARGSUSED */ 231 static int 232 vfs_free_netcred(struct radix_node *rn, void *w) 233 { 234 struct radix_node_head *rnh = (struct radix_node_head *) w; 235 struct ucred *cred; 236 237 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, &rnh->rh); 238 cred = ((struct netcred *)rn)->netc_anon; 239 if (cred != NULL) 240 crfree(cred); 241 free(rn, M_NETADDR); 242 return (0); 243 } 244 245 #if defined(INET) || defined(INET6) 246 static struct radix_node_head * 247 vfs_create_addrlist_af(struct radix_node_head **prnh, int off) 248 { 249 250 if (rn_inithead((void **)prnh, off) == 0) 251 return (NULL); 252 RADIX_NODE_HEAD_LOCK_INIT(*prnh); 253 return (*prnh); 254 } 255 #endif 256 257 static void 258 vfs_free_addrlist_af(struct radix_node_head **prnh) 259 { 260 struct radix_node_head *rnh; 261 262 rnh = *prnh; 263 RADIX_NODE_HEAD_LOCK(rnh); 264 (*rnh->rnh_walktree)(&rnh->rh, vfs_free_netcred, rnh); 265 RADIX_NODE_HEAD_UNLOCK(rnh); 266 RADIX_NODE_HEAD_DESTROY(rnh); 267 rn_detachhead((void **)prnh); 268 prnh = NULL; 269 } 270 271 /* 272 * Free the net address hash lists that are hanging off the mount points. 273 */ 274 void 275 vfs_free_addrlist(struct netexport *nep) 276 { 277 struct ucred *cred; 278 279 if (nep->ne4 != NULL) 280 vfs_free_addrlist_af(&nep->ne4); 281 if (nep->ne6 != NULL) 282 vfs_free_addrlist_af(&nep->ne6); 283 284 cred = nep->ne_defexported.netc_anon; 285 if (cred != NULL) { 286 crfree(cred); 287 nep->ne_defexported.netc_anon = NULL; 288 } 289 290 } 291 292 /* 293 * High level function to manipulate export options on a mount point 294 * and the passed in netexport. 295 * Struct export_args *argp is the variable used to twiddle options, 296 * the structure is described in sys/mount.h 297 * The do_exjail argument should be true if *mp is in the mountlist 298 * and false if not. It is not in the mountlist for the NFSv4 rootfs 299 * fake mount point just used for exports. 300 */ 301 int 302 vfs_export(struct mount *mp, struct export_args *argp, bool do_exjail) 303 { 304 struct netexport *nep; 305 struct ucred *cr; 306 struct prison *pr; 307 int error; 308 bool new_nep; 309 310 if ((argp->ex_flags & (MNT_DELEXPORT | MNT_EXPORTED)) == 0) 311 return (EINVAL); 312 313 if ((argp->ex_flags & MNT_EXPORTED) != 0 && 314 (argp->ex_numsecflavors < 0 315 || argp->ex_numsecflavors >= MAXSECFLAVORS)) 316 return (EINVAL); 317 318 error = 0; 319 pr = curthread->td_ucred->cr_prison; 320 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL); 321 nep = mp->mnt_export; 322 if (argp->ex_flags & MNT_DELEXPORT) { 323 if (nep == NULL) { 324 error = ENOENT; 325 goto out; 326 } 327 MNT_ILOCK(mp); 328 if (mp->mnt_exjail != NULL && mp->mnt_exjail->cr_prison != pr && 329 pr == &prison0) { 330 MNT_IUNLOCK(mp); 331 /* EXDEV will not get logged by mountd(8). */ 332 error = EXDEV; 333 goto out; 334 } else if (mp->mnt_exjail != NULL && 335 mp->mnt_exjail->cr_prison != pr) { 336 MNT_IUNLOCK(mp); 337 /* EPERM will get logged by mountd(8). */ 338 error = EPERM; 339 goto out; 340 } 341 MNT_IUNLOCK(mp); 342 if (mp->mnt_flag & MNT_EXPUBLIC) { 343 vfs_setpublicfs(NULL, NULL, NULL); 344 MNT_ILOCK(mp); 345 mp->mnt_flag &= ~MNT_EXPUBLIC; 346 MNT_IUNLOCK(mp); 347 } 348 vfs_free_addrlist(nep); 349 mp->mnt_export = NULL; 350 free(nep, M_MOUNT); 351 nep = NULL; 352 MNT_ILOCK(mp); 353 cr = mp->mnt_exjail; 354 mp->mnt_exjail = NULL; 355 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 356 MNT_IUNLOCK(mp); 357 if (cr != NULL) { 358 atomic_subtract_int(&pr->pr_exportcnt, 1); 359 crfree(cr); 360 } 361 } 362 if (argp->ex_flags & MNT_EXPORTED) { 363 new_nep = false; 364 MNT_ILOCK(mp); 365 if (mp->mnt_exjail == NULL) { 366 MNT_IUNLOCK(mp); 367 if (do_exjail && nep != NULL) { 368 vfs_free_addrlist(nep); 369 memset(nep, 0, sizeof(*nep)); 370 new_nep = true; 371 } 372 } else if (mp->mnt_exjail->cr_prison != pr) { 373 MNT_IUNLOCK(mp); 374 error = EPERM; 375 goto out; 376 } else 377 MNT_IUNLOCK(mp); 378 if (nep == NULL) { 379 nep = malloc(sizeof(struct netexport), M_MOUNT, 380 M_WAITOK | M_ZERO); 381 mp->mnt_export = nep; 382 new_nep = true; 383 } 384 if (argp->ex_flags & MNT_EXPUBLIC) { 385 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) { 386 if (new_nep) { 387 mp->mnt_export = NULL; 388 free(nep, M_MOUNT); 389 } 390 goto out; 391 } 392 new_nep = false; 393 MNT_ILOCK(mp); 394 if (do_exjail && mp->mnt_exjail == NULL) { 395 mp->mnt_exjail = crhold(curthread->td_ucred); 396 atomic_add_int(&pr->pr_exportcnt, 1); 397 } 398 mp->mnt_flag |= MNT_EXPUBLIC; 399 MNT_IUNLOCK(mp); 400 } 401 if (argp->ex_numsecflavors == 0) { 402 argp->ex_numsecflavors = 1; 403 argp->ex_secflavors[0] = AUTH_SYS; 404 } 405 if ((error = vfs_hang_addrlist(mp, nep, argp))) { 406 if (new_nep) { 407 mp->mnt_export = NULL; 408 free(nep, M_MOUNT); 409 } 410 goto out; 411 } 412 MNT_ILOCK(mp); 413 if (do_exjail && mp->mnt_exjail == NULL) { 414 mp->mnt_exjail = crhold(curthread->td_ucred); 415 atomic_add_int(&pr->pr_exportcnt, 1); 416 } 417 mp->mnt_flag |= MNT_EXPORTED; 418 MNT_IUNLOCK(mp); 419 } 420 421 out: 422 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); 423 /* 424 * Once we have executed the vfs_export() command, we do 425 * not want to keep the "export" option around in the 426 * options list, since that will cause subsequent MNT_UPDATE 427 * calls to fail. The export information is saved in 428 * mp->mnt_export, so we can safely delete the "export" mount option 429 * here. 430 */ 431 vfs_deleteopt(mp->mnt_optnew, "export"); 432 vfs_deleteopt(mp->mnt_opt, "export"); 433 return (error); 434 } 435 436 /* 437 * Get rid of credential references for this prison. 438 */ 439 void 440 vfs_exjail_delete(struct prison *pr) 441 { 442 struct mount *mp; 443 struct ucred *cr; 444 int error, i; 445 446 /* 447 * Since this function is called from prison_cleanup() after 448 * all processes in the prison have exited, the value of 449 * pr_exportcnt can no longer increase. It is possible for 450 * a dismount of a file system exported within this prison 451 * to be in progress. In this case, the file system is no 452 * longer in the mountlist and the mnt_exjail will be free'd 453 * by vfs_mount_destroy() at some time. As such, pr_exportcnt 454 * and, therefore "i", is the upper bound on the number of 455 * mnt_exjail entries to be found by this function. 456 */ 457 i = atomic_load_int(&pr->pr_exportcnt); 458 KASSERT(i >= 0, ("vfs_exjail_delete: pr_exportcnt negative")); 459 if (i == 0) 460 return; 461 mtx_lock(&mountlist_mtx); 462 tryagain: 463 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 464 MNT_ILOCK(mp); 465 if (mp->mnt_exjail != NULL && 466 mp->mnt_exjail->cr_prison == pr) { 467 MNT_IUNLOCK(mp); 468 error = vfs_busy(mp, MBF_MNTLSTLOCK | MBF_NOWAIT); 469 if (error != 0) { 470 /* 471 * If the vfs_busy() fails, we still want to 472 * get rid of mnt_exjail for two reasons: 473 * - a credential reference will result in 474 * a prison not being removed 475 * - setting mnt_exjail NULL indicates that 476 * the exports are no longer valid 477 * The now invalid exports will be deleted 478 * when the file system is dismounted or 479 * the file system is re-exported by mountd. 480 */ 481 cr = NULL; 482 MNT_ILOCK(mp); 483 if (mp->mnt_exjail != NULL && 484 mp->mnt_exjail->cr_prison == pr) { 485 cr = mp->mnt_exjail; 486 mp->mnt_exjail = NULL; 487 } 488 MNT_IUNLOCK(mp); 489 if (cr != NULL) { 490 crfree(cr); 491 i--; 492 } 493 if (i == 0) 494 break; 495 continue; 496 } 497 cr = NULL; 498 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL); 499 MNT_ILOCK(mp); 500 if (mp->mnt_exjail != NULL && 501 mp->mnt_exjail->cr_prison == pr) { 502 cr = mp->mnt_exjail; 503 mp->mnt_exjail = NULL; 504 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 505 MNT_IUNLOCK(mp); 506 vfs_free_addrlist(mp->mnt_export); 507 free(mp->mnt_export, M_MOUNT); 508 mp->mnt_export = NULL; 509 } else 510 MNT_IUNLOCK(mp); 511 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); 512 if (cr != NULL) { 513 crfree(cr); 514 i--; 515 } 516 mtx_lock(&mountlist_mtx); 517 vfs_unbusy(mp); 518 if (i == 0) 519 break; 520 goto tryagain; 521 } 522 MNT_IUNLOCK(mp); 523 } 524 mtx_unlock(&mountlist_mtx); 525 } 526 527 /* 528 * Set the publicly exported filesystem (WebNFS). Currently, only 529 * one public filesystem is possible in the spec (RFC 2054 and 2055) 530 */ 531 int 532 vfs_setpublicfs(struct mount *mp, struct netexport *nep, 533 struct export_args *argp) 534 { 535 int error; 536 struct vnode *rvp; 537 char *cp; 538 539 /* 540 * mp == NULL -> invalidate the current info, the FS is 541 * no longer exported. May be called from either vfs_export 542 * or unmount, so check if it hasn't already been done. 543 */ 544 if (mp == NULL) { 545 if (nfs_pub.np_valid) { 546 nfs_pub.np_valid = 0; 547 if (nfs_pub.np_index != NULL) { 548 free(nfs_pub.np_index, M_TEMP); 549 nfs_pub.np_index = NULL; 550 } 551 } 552 return (0); 553 } 554 555 /* 556 * Only one allowed at a time. 557 */ 558 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 559 return (EBUSY); 560 561 /* 562 * Get real filehandle for root of exported FS. 563 */ 564 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); 565 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; 566 567 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp))) 568 return (error); 569 570 if ((error = VOP_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 571 return (error); 572 573 vput(rvp); 574 575 /* 576 * If an indexfile was specified, pull it in. 577 */ 578 if (argp->ex_indexfile != NULL) { 579 if (nfs_pub.np_index == NULL) 580 nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP, 581 M_WAITOK); 582 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 583 MAXNAMLEN, (size_t *)0); 584 if (!error) { 585 /* 586 * Check for illegal filenames. 587 */ 588 for (cp = nfs_pub.np_index; *cp; cp++) { 589 if (*cp == '/') { 590 error = EINVAL; 591 break; 592 } 593 } 594 } 595 if (error) { 596 free(nfs_pub.np_index, M_TEMP); 597 nfs_pub.np_index = NULL; 598 return (error); 599 } 600 } 601 602 nfs_pub.np_mount = mp; 603 nfs_pub.np_valid = 1; 604 return (0); 605 } 606 607 /* 608 * Used by the filesystems to determine if a given network address 609 * (passed in 'nam') is present in their exports list, returns a pointer 610 * to struct netcred so that the filesystem can examine it for 611 * access rights (read/write/etc). 612 */ 613 static struct netcred * 614 vfs_export_lookup(struct mount *mp, struct sockaddr *nam) 615 { 616 RADIX_NODE_HEAD_RLOCK_TRACKER; 617 struct netexport *nep; 618 struct netcred *np = NULL; 619 struct radix_node_head *rnh; 620 struct sockaddr *saddr; 621 622 nep = mp->mnt_export; 623 if (nep == NULL) 624 return (NULL); 625 if ((mp->mnt_flag & MNT_EXPORTED) == 0) 626 return (NULL); 627 628 /* 629 * Lookup in the export list 630 */ 631 if (nam != NULL) { 632 saddr = nam; 633 rnh = NULL; 634 switch (saddr->sa_family) { 635 case AF_INET: 636 rnh = nep->ne4; 637 break; 638 case AF_INET6: 639 rnh = nep->ne6; 640 break; 641 } 642 if (rnh != NULL) { 643 RADIX_NODE_HEAD_RLOCK(rnh); 644 np = (struct netcred *) (*rnh->rnh_matchaddr)(saddr, &rnh->rh); 645 RADIX_NODE_HEAD_RUNLOCK(rnh); 646 if (np != NULL && (np->netc_rnodes->rn_flags & RNF_ROOT) != 0) 647 return (NULL); 648 } 649 } 650 651 /* 652 * If no address match, use the default if it exists. 653 */ 654 if (np == NULL && (mp->mnt_flag & MNT_DEFEXPORTED) != 0) 655 return (&nep->ne_defexported); 656 657 return (np); 658 } 659 660 /* 661 * XXX: This comment comes from the deprecated ufs_check_export() 662 * XXX: and may not entirely apply, but lacking something better: 663 * This is the generic part of fhtovp called after the underlying 664 * filesystem has validated the file handle. 665 * 666 * Verify that a host should have access to a filesystem. 667 */ 668 669 int 670 vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, uint64_t *extflagsp, 671 struct ucred **credanonp, int *numsecflavors, int *secflavors) 672 { 673 struct netcred *np; 674 675 lockmgr(&mp->mnt_explock, LK_SHARED, NULL); 676 np = vfs_export_lookup(mp, nam); 677 if (np == NULL) { 678 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); 679 *credanonp = NULL; 680 return (EACCES); 681 } 682 *extflagsp = np->netc_exflags; 683 if ((*credanonp = np->netc_anon) != NULL) 684 crhold(*credanonp); 685 if (numsecflavors) { 686 *numsecflavors = np->netc_numsecflavors; 687 KASSERT(*numsecflavors > 0, 688 ("%s: numsecflavors <= 0", __func__)); 689 KASSERT(*numsecflavors < MAXSECFLAVORS, 690 ("%s: numsecflavors >= MAXSECFLAVORS", __func__)); 691 } 692 if (secflavors && np->netc_numsecflavors > 0) 693 memcpy(secflavors, np->netc_secflavors, np->netc_numsecflavors * 694 sizeof(int)); 695 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL); 696 return (0); 697 } 698