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/refcount.h>
50 #include <sys/socket.h>
51 #include <sys/systm.h>
52 #include <sys/vnode.h>
54 #include <net/radix.h>
56 static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure");
58 static void vfs_free_addrlist(struct netexport *nep);
59 static int vfs_free_netcred(struct radix_node *rn, void *w);
60 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
61 struct export_args *argp);
62 static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *);
65 * Network address lookup element
68 struct radix_node netc_rnodes[2];
70 struct ucred netc_anon;
74 * Network export information
77 struct netcred ne_defexported; /* Default export */
78 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
82 * Build hash lists of net addresses and hang them off the mount point.
83 * Called by ufs_mount() to set up the lists of export addresses.
86 vfs_hang_addrlist(mp, nep, argp)
88 struct netexport *nep;
89 struct export_args *argp;
91 register struct netcred *np;
92 register struct radix_node_head *rnh;
94 struct radix_node *rn;
95 struct sockaddr *saddr, *smask = 0;
100 * XXX: This routine converts from a `struct xucred'
101 * (argp->ex_anon) to a `struct ucred' (np->netc_anon). This
102 * operation is questionable; for example, what should be done
103 * with fields like cr_uidinfo and cr_prison? Currently, this
104 * routine does not touch them (leaves them as NULL).
106 if (argp->ex_anon.cr_version != XUCRED_VERSION)
109 if (argp->ex_addrlen == 0) {
110 if (mp->mnt_flag & MNT_DEFEXPORTED)
112 np = &nep->ne_defexported;
113 np->netc_exflags = argp->ex_flags;
114 bzero(&np->netc_anon, sizeof(np->netc_anon));
115 np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
116 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
117 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
118 sizeof(np->netc_anon.cr_groups));
119 refcount_init(&np->netc_anon.cr_ref, 1);
120 mp->mnt_flag |= MNT_DEFEXPORTED;
125 if (argp->ex_addrlen > MLEN)
129 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
130 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
131 saddr = (struct sockaddr *) (np + 1);
132 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
134 if (saddr->sa_family > AF_MAX) {
138 if (saddr->sa_len > argp->ex_addrlen)
139 saddr->sa_len = argp->ex_addrlen;
140 if (argp->ex_masklen) {
141 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
142 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
145 if (smask->sa_len > argp->ex_masklen)
146 smask->sa_len = argp->ex_masklen;
148 i = saddr->sa_family;
149 if ((rnh = nep->ne_rtable[i]) == NULL) {
151 * Seems silly to initialize every AF when most are not used,
152 * do so on demand here
154 for (dom = domains; dom; dom = dom->dom_next)
155 if (dom->dom_family == i && dom->dom_rtattach) {
156 dom->dom_rtattach((void **) &nep->ne_rtable[i],
160 if ((rnh = nep->ne_rtable[i]) == NULL) {
165 RADIX_NODE_HEAD_LOCK(rnh);
166 rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes);
167 RADIX_NODE_HEAD_UNLOCK(rnh);
168 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
172 np->netc_exflags = argp->ex_flags;
173 bzero(&np->netc_anon, sizeof(np->netc_anon));
174 np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
175 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
176 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
177 sizeof(np->netc_anon.cr_groups));
178 refcount_init(&np->netc_anon.cr_ref, 1);
185 /* Helper for vfs_free_addrlist. */
188 vfs_free_netcred(rn, w)
189 struct radix_node *rn;
192 register struct radix_node_head *rnh = (struct radix_node_head *) w;
194 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
200 * Free the net address hash lists that are hanging off the mount points.
203 vfs_free_addrlist(nep)
204 struct netexport *nep;
207 register struct radix_node_head *rnh;
209 for (i = 0; i <= AF_MAX; i++)
210 if ((rnh = nep->ne_rtable[i])) {
211 RADIX_NODE_HEAD_LOCK(rnh);
212 (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
213 RADIX_NODE_HEAD_DESTROY(rnh);
215 nep->ne_rtable[i] = NULL; /* not SMP safe XXX */
220 * High level function to manipulate export options on a mount point
221 * and the passed in netexport.
222 * Struct export_args *argp is the variable used to twiddle options,
223 * the structure is described in sys/mount.h
228 struct export_args *argp;
230 struct netexport *nep;
233 nep = mp->mnt_export;
234 if (argp->ex_flags & MNT_DELEXPORT) {
237 if (mp->mnt_flag & MNT_EXPUBLIC) {
238 vfs_setpublicfs(NULL, NULL, NULL);
239 mp->mnt_flag &= ~MNT_EXPUBLIC;
241 vfs_free_addrlist(nep);
242 mp->mnt_export = NULL;
245 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
247 if (argp->ex_flags & MNT_EXPORTED) {
249 nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
250 mp->mnt_export = nep;
252 if (argp->ex_flags & MNT_EXPUBLIC) {
253 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
255 mp->mnt_flag |= MNT_EXPUBLIC;
257 if ((error = vfs_hang_addrlist(mp, nep, argp)))
259 mp->mnt_flag |= MNT_EXPORTED;
265 * Set the publicly exported filesystem (WebNFS). Currently, only
266 * one public filesystem is possible in the spec (RFC 2054 and 2055)
269 vfs_setpublicfs(mp, nep, argp)
271 struct netexport *nep;
272 struct export_args *argp;
279 * mp == NULL -> invalidate the current info, the FS is
280 * no longer exported. May be called from either vfs_export
281 * or unmount, so check if it hasn't already been done.
284 if (nfs_pub.np_valid) {
285 nfs_pub.np_valid = 0;
286 if (nfs_pub.np_index != NULL) {
287 FREE(nfs_pub.np_index, M_TEMP);
288 nfs_pub.np_index = NULL;
295 * Only one allowed at a time.
297 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
301 * Get real filehandle for root of exported FS.
303 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
304 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
306 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp, curthread /* XXX */)))
309 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
315 * If an indexfile was specified, pull it in.
317 if (argp->ex_indexfile != NULL) {
318 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP,
320 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
321 MAXNAMLEN, (size_t *)0);
324 * Check for illegal filenames.
326 for (cp = nfs_pub.np_index; *cp; cp++) {
334 FREE(nfs_pub.np_index, M_TEMP);
339 nfs_pub.np_mount = mp;
340 nfs_pub.np_valid = 1;
345 * Used by the filesystems to determine if a given network address
346 * (passed in 'nam') is present in thier exports list, returns a pointer
347 * to struct netcred so that the filesystem can examine it for
348 * access rights (read/write/etc).
350 static struct netcred *
351 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
353 struct netexport *nep;
354 register struct netcred *np;
355 register struct radix_node_head *rnh;
356 struct sockaddr *saddr;
358 nep = mp->mnt_export;
362 if (mp->mnt_flag & MNT_EXPORTED) {
364 * Lookup in the export list first.
368 rnh = nep->ne_rtable[saddr->sa_family];
370 RADIX_NODE_HEAD_LOCK(rnh);
371 np = (struct netcred *)
372 (*rnh->rnh_matchaddr)(saddr, rnh);
373 RADIX_NODE_HEAD_UNLOCK(rnh);
374 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
379 * If no address match, use the default if it exists.
381 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
382 np = &nep->ne_defexported;
388 * XXX: This comment comes from the deprecated ufs_check_export()
389 * XXX: and may not entirely apply, but lacking something better:
390 * This is the generic part of fhtovp called after the underlying
391 * filesystem has validated the file handle.
393 * Verify that a host should have access to a filesystem.
397 vfs_stdcheckexp(mp, nam, extflagsp, credanonp)
399 struct sockaddr *nam;
401 struct ucred **credanonp;
405 np = vfs_export_lookup(mp, nam);
408 *extflagsp = np->netc_exflags;
409 *credanonp = &np->netc_anon;