2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/dirent.h>
42 #include <sys/domain.h>
43 #include <sys/kernel.h>
45 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/mutex.h>
49 #include <sys/rwlock.h>
50 #include <sys/refcount.h>
51 #include <sys/socket.h>
52 #include <sys/systm.h>
53 #include <sys/vnode.h>
55 #include <net/radix.h>
57 static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure");
59 static void vfs_free_addrlist(struct netexport *nep);
60 static int vfs_free_netcred(struct radix_node *rn, void *w);
61 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
62 struct export_args *argp);
63 static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *);
66 * Network address lookup element
69 struct radix_node netc_rnodes[2];
71 struct ucred *netc_anon;
72 int netc_numsecflavors;
73 int netc_secflavors[MAXSECFLAVORS];
77 * Network export information
80 struct netcred ne_defexported; /* Default export */
81 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
85 * Build hash lists of net addresses and hang them off the mount point.
86 * Called by vfs_export() to set up the lists of export addresses.
89 vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
90 struct export_args *argp)
92 register struct netcred *np;
93 register struct radix_node_head *rnh;
95 struct radix_node *rn;
96 struct sockaddr *saddr, *smask = 0;
101 * XXX: This routine converts from a `struct xucred'
102 * (argp->ex_anon) to a `struct ucred' (np->netc_anon). This
103 * operation is questionable; for example, what should be done
104 * with fields like cr_uidinfo and cr_prison? Currently, this
105 * routine does not touch them (leaves them as NULL).
107 if (argp->ex_anon.cr_version != XUCRED_VERSION) {
108 vfs_mount_error(mp, "ex_anon.cr_version: %d != %d",
109 argp->ex_anon.cr_version, XUCRED_VERSION);
113 if (argp->ex_addrlen == 0) {
114 if (mp->mnt_flag & MNT_DEFEXPORTED) {
116 "MNT_DEFEXPORTED already set for mount %p", mp);
119 np = &nep->ne_defexported;
120 np->netc_exflags = argp->ex_flags;
121 np->netc_anon = crget();
122 np->netc_anon->cr_uid = argp->ex_anon.cr_uid;
123 crsetgroups(np->netc_anon, argp->ex_anon.cr_ngroups,
124 argp->ex_anon.cr_groups);
125 np->netc_numsecflavors = argp->ex_numsecflavors;
126 bcopy(argp->ex_secflavors, np->netc_secflavors,
127 sizeof(np->netc_secflavors));
129 mp->mnt_flag |= MNT_DEFEXPORTED;
135 if (argp->ex_addrlen > MLEN) {
136 vfs_mount_error(mp, "ex_addrlen %d is greater than %d",
137 argp->ex_addrlen, MLEN);
142 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
143 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
144 saddr = (struct sockaddr *) (np + 1);
145 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
147 if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) {
149 vfs_mount_error(mp, "Invalid saddr->sa_family: %d");
152 if (saddr->sa_len > argp->ex_addrlen)
153 saddr->sa_len = argp->ex_addrlen;
154 if (argp->ex_masklen) {
155 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
156 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
159 if (smask->sa_len > argp->ex_masklen)
160 smask->sa_len = argp->ex_masklen;
162 i = saddr->sa_family;
163 if ((rnh = nep->ne_rtable[i]) == NULL) {
165 * Seems silly to initialize every AF when most are not used,
166 * do so on demand here
168 for (dom = domains; dom; dom = dom->dom_next) {
169 KASSERT(((i == AF_INET) || (i == AF_INET6)),
170 ("unexpected protocol in vfs_hang_addrlist"));
171 if (dom->dom_family == i && dom->dom_rtattach) {
174 * The INET and INET6 domains know the
175 * offset already. We don't need to send it
176 * So we just use it as a flag to say that
177 * we are or are not setting up a real routing
178 * table. Only IP and IPV6 need have this
179 * be 0 so all other protocols can stay the
180 * same (ABI compatible).
183 (void **) &nep->ne_rtable[i], 0);
187 if ((rnh = nep->ne_rtable[i]) == NULL) {
189 vfs_mount_error(mp, "%s %s %d",
190 "Unable to initialize radix node head ",
191 "for address family", i);
195 RADIX_NODE_HEAD_LOCK(rnh);
196 rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes);
197 RADIX_NODE_HEAD_UNLOCK(rnh);
198 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
200 vfs_mount_error(mp, "Invalid radix node head, rn: %p %p",
204 np->netc_exflags = argp->ex_flags;
205 np->netc_anon = crget();
206 np->netc_anon->cr_uid = argp->ex_anon.cr_uid;
207 crsetgroups(np->netc_anon, argp->ex_anon.cr_ngroups,
208 np->netc_anon->cr_groups);
209 np->netc_numsecflavors = argp->ex_numsecflavors;
210 bcopy(argp->ex_secflavors, np->netc_secflavors,
211 sizeof(np->netc_secflavors));
218 /* Helper for vfs_free_addrlist. */
221 vfs_free_netcred(struct radix_node *rn, void *w)
223 struct radix_node_head *rnh = (struct radix_node_head *) w;
226 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
227 cred = ((struct netcred *)rn)->netc_anon;
235 * Free the net address hash lists that are hanging off the mount points.
238 vfs_free_addrlist(struct netexport *nep)
241 struct radix_node_head *rnh;
244 for (i = 0; i <= AF_MAX; i++) {
245 if ((rnh = nep->ne_rtable[i])) {
246 RADIX_NODE_HEAD_LOCK(rnh);
247 (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
248 RADIX_NODE_HEAD_UNLOCK(rnh);
249 RADIX_NODE_HEAD_DESTROY(rnh);
251 nep->ne_rtable[i] = NULL; /* not SMP safe XXX */
254 cred = nep->ne_defexported.netc_anon;
261 * High level function to manipulate export options on a mount point
262 * and the passed in netexport.
263 * Struct export_args *argp is the variable used to twiddle options,
264 * the structure is described in sys/mount.h
267 vfs_export(struct mount *mp, struct export_args *argp)
269 struct netexport *nep;
272 if (argp->ex_numsecflavors < 0
273 || argp->ex_numsecflavors >= MAXSECFLAVORS)
277 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL);
278 nep = mp->mnt_export;
279 if (argp->ex_flags & MNT_DELEXPORT) {
284 if (mp->mnt_flag & MNT_EXPUBLIC) {
285 vfs_setpublicfs(NULL, NULL, NULL);
287 mp->mnt_flag &= ~MNT_EXPUBLIC;
290 vfs_free_addrlist(nep);
291 mp->mnt_export = NULL;
295 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
298 if (argp->ex_flags & MNT_EXPORTED) {
300 nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
301 mp->mnt_export = nep;
303 if (argp->ex_flags & MNT_EXPUBLIC) {
304 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
307 mp->mnt_flag |= MNT_EXPUBLIC;
310 if ((error = vfs_hang_addrlist(mp, nep, argp)))
313 mp->mnt_flag |= MNT_EXPORTED;
318 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
320 * Once we have executed the vfs_export() command, we do
321 * not want to keep the "export" option around in the
322 * options list, since that will cause subsequent MNT_UPDATE
323 * calls to fail. The export information is saved in
324 * mp->mnt_export, so we can safely delete the "export" mount option
327 vfs_deleteopt(mp->mnt_optnew, "export");
328 vfs_deleteopt(mp->mnt_opt, "export");
333 * Set the publicly exported filesystem (WebNFS). Currently, only
334 * one public filesystem is possible in the spec (RFC 2054 and 2055)
337 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
338 struct export_args *argp)
345 * mp == NULL -> invalidate the current info, the FS is
346 * no longer exported. May be called from either vfs_export
347 * or unmount, so check if it hasn't already been done.
350 if (nfs_pub.np_valid) {
351 nfs_pub.np_valid = 0;
352 if (nfs_pub.np_index != NULL) {
353 free(nfs_pub.np_index, M_TEMP);
354 nfs_pub.np_index = NULL;
361 * Only one allowed at a time.
363 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
367 * Get real filehandle for root of exported FS.
369 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
370 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
372 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp)))
375 if ((error = VOP_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
381 * If an indexfile was specified, pull it in.
383 if (argp->ex_indexfile != NULL) {
384 if (nfs_pub.np_index != NULL)
385 nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP,
387 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
388 MAXNAMLEN, (size_t *)0);
391 * Check for illegal filenames.
393 for (cp = nfs_pub.np_index; *cp; cp++) {
401 free(nfs_pub.np_index, M_TEMP);
402 nfs_pub.np_index = NULL;
407 nfs_pub.np_mount = mp;
408 nfs_pub.np_valid = 1;
413 * Used by the filesystems to determine if a given network address
414 * (passed in 'nam') is present in their exports list, returns a pointer
415 * to struct netcred so that the filesystem can examine it for
416 * access rights (read/write/etc).
418 static struct netcred *
419 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
421 struct netexport *nep;
422 register struct netcred *np;
423 register struct radix_node_head *rnh;
424 struct sockaddr *saddr;
426 nep = mp->mnt_export;
430 if (mp->mnt_flag & MNT_EXPORTED) {
432 * Lookup in the export list first.
436 rnh = nep->ne_rtable[saddr->sa_family];
438 RADIX_NODE_HEAD_RLOCK(rnh);
439 np = (struct netcred *)
440 (*rnh->rnh_matchaddr)(saddr, rnh);
441 RADIX_NODE_HEAD_RUNLOCK(rnh);
442 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
447 * If no address match, use the default if it exists.
449 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
450 np = &nep->ne_defexported;
456 * XXX: This comment comes from the deprecated ufs_check_export()
457 * XXX: and may not entirely apply, but lacking something better:
458 * This is the generic part of fhtovp called after the underlying
459 * filesystem has validated the file handle.
461 * Verify that a host should have access to a filesystem.
465 vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, int *extflagsp,
466 struct ucred **credanonp, int *numsecflavors, int **secflavors)
470 lockmgr(&mp->mnt_explock, LK_SHARED, NULL);
471 np = vfs_export_lookup(mp, nam);
473 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
477 *extflagsp = np->netc_exflags;
478 if ((*credanonp = np->netc_anon) != NULL)
481 *numsecflavors = np->netc_numsecflavors;
483 *secflavors = np->netc_secflavors;
484 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);