2 * SPDX-License-Identifier: BSD-3-Clause
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
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9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
43 #include "opt_inet6.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/dirent.h>
49 #include <sys/kernel.h>
51 #include <sys/malloc.h>
53 #include <sys/mount.h>
54 #include <sys/mutex.h>
55 #include <sys/rmlock.h>
56 #include <sys/refcount.h>
57 #include <sys/signalvar.h>
58 #include <sys/socket.h>
59 #include <sys/vnode.h>
61 #include <netinet/in.h>
62 #include <net/radix.h>
64 #include <rpc/types.h>
67 static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure");
69 #if defined(INET) || defined(INET6)
70 static struct radix_node_head *vfs_create_addrlist_af(
71 struct radix_node_head **prnh, int off);
73 static void vfs_free_addrlist(struct netexport *nep);
74 static int vfs_free_netcred(struct radix_node *rn, void *w);
75 static void vfs_free_addrlist_af(struct radix_node_head **prnh);
76 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
77 struct export_args *argp);
78 static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *);
81 * Network address lookup element
84 struct radix_node netc_rnodes[2];
85 uint64_t netc_exflags;
86 struct ucred *netc_anon;
87 int netc_numsecflavors;
88 int netc_secflavors[MAXSECFLAVORS];
92 * Network export information
95 struct netcred ne_defexported; /* Default export */
96 struct radix_node_head *ne4;
97 struct radix_node_head *ne6;
101 * Build hash lists of net addresses and hang them off the mount point.
102 * Called by vfs_export() to set up the lists of export addresses.
105 vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
106 struct export_args *argp)
109 struct radix_node_head *rnh;
111 struct radix_node *rn;
112 struct sockaddr *saddr, *smask = NULL;
113 #if defined(INET6) || defined(INET)
118 KASSERT(argp->ex_numsecflavors > 0,
119 ("%s: numsecflavors <= 0", __func__));
120 KASSERT(argp->ex_numsecflavors < MAXSECFLAVORS,
121 ("%s: numsecflavors >= MAXSECFLAVORS", __func__));
124 * XXX: This routine converts from a uid plus gid list
125 * to a `struct ucred' (np->netc_anon). This
126 * operation is questionable; for example, what should be done
127 * with fields like cr_uidinfo and cr_prison? Currently, this
128 * routine does not touch them (leaves them as NULL).
130 if (argp->ex_addrlen == 0) {
131 if (mp->mnt_flag & MNT_DEFEXPORTED) {
133 "MNT_DEFEXPORTED already set for mount %p", mp);
136 np = &nep->ne_defexported;
137 np->netc_exflags = argp->ex_flags;
138 np->netc_anon = crget();
139 np->netc_anon->cr_uid = argp->ex_uid;
140 crsetgroups(np->netc_anon, argp->ex_ngroups,
142 np->netc_anon->cr_prison = &prison0;
143 prison_hold(np->netc_anon->cr_prison);
144 np->netc_numsecflavors = argp->ex_numsecflavors;
145 bcopy(argp->ex_secflavors, np->netc_secflavors,
146 sizeof(np->netc_secflavors));
148 mp->mnt_flag |= MNT_DEFEXPORTED;
154 if (argp->ex_addrlen > MLEN) {
155 vfs_mount_error(mp, "ex_addrlen %d is greater than %d",
156 argp->ex_addrlen, MLEN);
161 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
162 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
163 saddr = (struct sockaddr *) (np + 1);
164 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
166 if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) {
168 vfs_mount_error(mp, "Invalid saddr->sa_family: %d");
171 if (saddr->sa_len > argp->ex_addrlen)
172 saddr->sa_len = argp->ex_addrlen;
173 if (argp->ex_masklen) {
174 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
175 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
178 if (smask->sa_len > argp->ex_masklen)
179 smask->sa_len = argp->ex_masklen;
182 switch (saddr->sa_family) {
185 if ((rnh = nep->ne4) == NULL) {
186 off = offsetof(struct sockaddr_in, sin_addr) << 3;
187 rnh = vfs_create_addrlist_af(&nep->ne4, off);
193 if ((rnh = nep->ne6) == NULL) {
194 off = offsetof(struct sockaddr_in6, sin6_addr) << 3;
195 rnh = vfs_create_addrlist_af(&nep->ne6, off);
202 vfs_mount_error(mp, "%s %s %d",
203 "Unable to initialize radix node head ",
204 "for address family", saddr->sa_family);
207 RADIX_NODE_HEAD_LOCK(rnh);
208 rn = (*rnh->rnh_addaddr)(saddr, smask, &rnh->rh, np->netc_rnodes);
209 RADIX_NODE_HEAD_UNLOCK(rnh);
210 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
213 "netcred already exists for given addr/mask");
216 np->netc_exflags = argp->ex_flags;
217 np->netc_anon = crget();
218 np->netc_anon->cr_uid = argp->ex_uid;
219 crsetgroups(np->netc_anon, argp->ex_ngroups,
221 np->netc_anon->cr_prison = &prison0;
222 prison_hold(np->netc_anon->cr_prison);
223 np->netc_numsecflavors = argp->ex_numsecflavors;
224 bcopy(argp->ex_secflavors, np->netc_secflavors,
225 sizeof(np->netc_secflavors));
232 /* Helper for vfs_free_addrlist. */
235 vfs_free_netcred(struct radix_node *rn, void *w)
237 struct radix_node_head *rnh = (struct radix_node_head *) w;
240 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, &rnh->rh);
241 cred = ((struct netcred *)rn)->netc_anon;
248 #if defined(INET) || defined(INET6)
249 static struct radix_node_head *
250 vfs_create_addrlist_af(struct radix_node_head **prnh, int off)
253 if (rn_inithead((void **)prnh, off) == 0)
255 RADIX_NODE_HEAD_LOCK_INIT(*prnh);
261 vfs_free_addrlist_af(struct radix_node_head **prnh)
263 struct radix_node_head *rnh;
266 RADIX_NODE_HEAD_LOCK(rnh);
267 (*rnh->rnh_walktree)(&rnh->rh, vfs_free_netcred, rnh);
268 RADIX_NODE_HEAD_UNLOCK(rnh);
269 RADIX_NODE_HEAD_DESTROY(rnh);
270 rn_detachhead((void **)prnh);
275 * Free the net address hash lists that are hanging off the mount points.
278 vfs_free_addrlist(struct netexport *nep)
282 if (nep->ne4 != NULL)
283 vfs_free_addrlist_af(&nep->ne4);
284 if (nep->ne6 != NULL)
285 vfs_free_addrlist_af(&nep->ne6);
287 cred = nep->ne_defexported.netc_anon;
294 * High level function to manipulate export options on a mount point
295 * and the passed in netexport.
296 * Struct export_args *argp is the variable used to twiddle options,
297 * the structure is described in sys/mount.h
300 vfs_export(struct mount *mp, struct export_args *argp)
302 struct netexport *nep;
305 if ((argp->ex_flags & (MNT_DELEXPORT | MNT_EXPORTED)) == 0)
308 if ((argp->ex_flags & MNT_EXPORTED) != 0 &&
309 (argp->ex_numsecflavors < 0
310 || argp->ex_numsecflavors >= MAXSECFLAVORS))
314 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL);
315 nep = mp->mnt_export;
316 if (argp->ex_flags & MNT_DELEXPORT) {
321 if (mp->mnt_flag & MNT_EXPUBLIC) {
322 vfs_setpublicfs(NULL, NULL, NULL);
324 mp->mnt_flag &= ~MNT_EXPUBLIC;
327 vfs_free_addrlist(nep);
328 mp->mnt_export = NULL;
332 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
335 if (argp->ex_flags & MNT_EXPORTED) {
337 nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
338 mp->mnt_export = nep;
340 if (argp->ex_flags & MNT_EXPUBLIC) {
341 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
344 mp->mnt_flag |= MNT_EXPUBLIC;
347 if (argp->ex_numsecflavors == 0) {
348 argp->ex_numsecflavors = 1;
349 argp->ex_secflavors[0] = AUTH_SYS;
351 if ((error = vfs_hang_addrlist(mp, nep, argp)))
354 mp->mnt_flag |= MNT_EXPORTED;
359 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
361 * Once we have executed the vfs_export() command, we do
362 * not want to keep the "export" option around in the
363 * options list, since that will cause subsequent MNT_UPDATE
364 * calls to fail. The export information is saved in
365 * mp->mnt_export, so we can safely delete the "export" mount option
368 vfs_deleteopt(mp->mnt_optnew, "export");
369 vfs_deleteopt(mp->mnt_opt, "export");
374 * Set the publicly exported filesystem (WebNFS). Currently, only
375 * one public filesystem is possible in the spec (RFC 2054 and 2055)
378 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
379 struct export_args *argp)
386 * mp == NULL -> invalidate the current info, the FS is
387 * no longer exported. May be called from either vfs_export
388 * or unmount, so check if it hasn't already been done.
391 if (nfs_pub.np_valid) {
392 nfs_pub.np_valid = 0;
393 if (nfs_pub.np_index != NULL) {
394 free(nfs_pub.np_index, M_TEMP);
395 nfs_pub.np_index = NULL;
402 * Only one allowed at a time.
404 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
408 * Get real filehandle for root of exported FS.
410 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
411 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
413 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp)))
416 if ((error = VOP_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
422 * If an indexfile was specified, pull it in.
424 if (argp->ex_indexfile != NULL) {
425 if (nfs_pub.np_index == NULL)
426 nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP,
428 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
429 MAXNAMLEN, (size_t *)0);
432 * Check for illegal filenames.
434 for (cp = nfs_pub.np_index; *cp; cp++) {
442 free(nfs_pub.np_index, M_TEMP);
443 nfs_pub.np_index = NULL;
448 nfs_pub.np_mount = mp;
449 nfs_pub.np_valid = 1;
454 * Used by the filesystems to determine if a given network address
455 * (passed in 'nam') is present in their exports list, returns a pointer
456 * to struct netcred so that the filesystem can examine it for
457 * access rights (read/write/etc).
459 static struct netcred *
460 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
462 RADIX_NODE_HEAD_RLOCK_TRACKER;
463 struct netexport *nep;
464 struct netcred *np = NULL;
465 struct radix_node_head *rnh;
466 struct sockaddr *saddr;
468 nep = mp->mnt_export;
471 if ((mp->mnt_flag & MNT_EXPORTED) == 0)
475 * Lookup in the export list
480 switch (saddr->sa_family) {
489 RADIX_NODE_HEAD_RLOCK(rnh);
490 np = (struct netcred *) (*rnh->rnh_matchaddr)(saddr, &rnh->rh);
491 RADIX_NODE_HEAD_RUNLOCK(rnh);
492 if (np != NULL && (np->netc_rnodes->rn_flags & RNF_ROOT) != 0)
498 * If no address match, use the default if it exists.
500 if (np == NULL && (mp->mnt_flag & MNT_DEFEXPORTED) != 0)
501 return (&nep->ne_defexported);
507 * XXX: This comment comes from the deprecated ufs_check_export()
508 * XXX: and may not entirely apply, but lacking something better:
509 * This is the generic part of fhtovp called after the underlying
510 * filesystem has validated the file handle.
512 * Verify that a host should have access to a filesystem.
516 vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, uint64_t *extflagsp,
517 struct ucred **credanonp, int *numsecflavors, int *secflavors)
521 lockmgr(&mp->mnt_explock, LK_SHARED, NULL);
522 np = vfs_export_lookup(mp, nam);
524 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
528 *extflagsp = np->netc_exflags;
529 if ((*credanonp = np->netc_anon) != NULL)
532 *numsecflavors = np->netc_numsecflavors;
533 KASSERT(*numsecflavors > 0,
534 ("%s: numsecflavors <= 0", __func__));
535 KASSERT(*numsecflavors < MAXSECFLAVORS,
536 ("%s: numsecflavors >= MAXSECFLAVORS", __func__));
538 if (secflavors && np->netc_numsecflavors > 0)
539 memcpy(secflavors, np->netc_secflavors, np->netc_numsecflavors *
541 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);