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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/socket.h>
50 #include <sys/systm.h>
51 #include <sys/vnode.h>
53 #include <net/radix.h>
55 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
57 static void vfs_free_addrlist(struct netexport *nep);
58 static int vfs_free_netcred(struct radix_node *rn, void *w);
59 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
60 struct export_args *argp);
61 static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *);
64 * Network address lookup element
67 struct radix_node netc_rnodes[2];
69 struct ucred netc_anon;
73 * Network export information
76 struct netcred ne_defexported; /* Default export */
77 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
81 * Build hash lists of net addresses and hang them off the mount point.
82 * Called by ufs_mount() to set up the lists of export addresses.
85 vfs_hang_addrlist(mp, nep, argp)
87 struct netexport *nep;
88 struct export_args *argp;
90 register struct netcred *np;
91 register struct radix_node_head *rnh;
93 struct radix_node *rn;
94 struct sockaddr *saddr, *smask = 0;
99 * XXX: This routine converts from a `struct xucred'
100 * (argp->ex_anon) to a `struct ucred' (np->netc_anon). This
101 * operation is questionable; for example, what should be done
102 * with fields like cr_uidinfo and cr_prison? Currently, this
103 * routine does not touch them (leaves them as NULL).
105 if (argp->ex_anon.cr_version != XUCRED_VERSION)
108 if (argp->ex_addrlen == 0) {
109 if (mp->mnt_flag & MNT_DEFEXPORTED)
111 np = &nep->ne_defexported;
112 np->netc_exflags = argp->ex_flags;
113 bzero(&np->netc_anon, sizeof(np->netc_anon));
114 np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
115 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
116 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
117 sizeof(np->netc_anon.cr_groups));
118 np->netc_anon.cr_ref = 1;
119 mp->mnt_flag |= MNT_DEFEXPORTED;
124 if (argp->ex_addrlen > MLEN)
128 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
129 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
130 saddr = (struct sockaddr *) (np + 1);
131 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
133 if (saddr->sa_family > AF_MAX) {
137 if (saddr->sa_len > argp->ex_addrlen)
138 saddr->sa_len = argp->ex_addrlen;
139 if (argp->ex_masklen) {
140 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
141 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
144 if (smask->sa_len > argp->ex_masklen)
145 smask->sa_len = argp->ex_masklen;
147 i = saddr->sa_family;
148 if ((rnh = nep->ne_rtable[i]) == NULL) {
150 * Seems silly to initialize every AF when most are not used,
151 * do so on demand here
153 for (dom = domains; dom; dom = dom->dom_next)
154 if (dom->dom_family == i && dom->dom_rtattach) {
155 dom->dom_rtattach((void **) &nep->ne_rtable[i],
159 if ((rnh = nep->ne_rtable[i]) == NULL) {
164 RADIX_NODE_HEAD_LOCK(rnh);
165 rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes);
166 RADIX_NODE_HEAD_UNLOCK(rnh);
167 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
171 np->netc_exflags = argp->ex_flags;
172 bzero(&np->netc_anon, sizeof(np->netc_anon));
173 np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
174 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
175 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
176 sizeof(np->netc_anon.cr_groups));
177 np->netc_anon.cr_ref = 1;
184 /* Helper for vfs_free_addrlist. */
187 vfs_free_netcred(rn, w)
188 struct radix_node *rn;
191 register struct radix_node_head *rnh = (struct radix_node_head *) w;
193 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
199 * Free the net address hash lists that are hanging off the mount points.
202 vfs_free_addrlist(nep)
203 struct netexport *nep;
206 register struct radix_node_head *rnh;
208 for (i = 0; i <= AF_MAX; i++)
209 if ((rnh = nep->ne_rtable[i])) {
210 RADIX_NODE_HEAD_LOCK(rnh);
211 (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
212 RADIX_NODE_HEAD_DESTROY(rnh);
214 nep->ne_rtable[i] = NULL; /* not SMP safe XXX */
219 * High level function to manipulate export options on a mount point
220 * and the passed in netexport.
221 * Struct export_args *argp is the variable used to twiddle options,
222 * the structure is described in sys/mount.h
227 struct export_args *argp;
229 struct netexport *nep;
232 nep = mp->mnt_export;
233 if (argp->ex_flags & MNT_DELEXPORT) {
236 if (mp->mnt_flag & MNT_EXPUBLIC) {
237 vfs_setpublicfs(NULL, NULL, NULL);
238 mp->mnt_flag &= ~MNT_EXPUBLIC;
240 vfs_free_addrlist(nep);
241 mp->mnt_export = NULL;
243 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
245 if (argp->ex_flags & MNT_EXPORTED) {
247 nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
248 mp->mnt_export = nep;
250 if (argp->ex_flags & MNT_EXPUBLIC) {
251 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
253 mp->mnt_flag |= MNT_EXPUBLIC;
255 if ((error = vfs_hang_addrlist(mp, nep, argp)))
257 mp->mnt_flag |= MNT_EXPORTED;
263 * Set the publicly exported filesystem (WebNFS). Currently, only
264 * one public filesystem is possible in the spec (RFC 2054 and 2055)
267 vfs_setpublicfs(mp, nep, argp)
269 struct netexport *nep;
270 struct export_args *argp;
277 * mp == NULL -> invalidate the current info, the FS is
278 * no longer exported. May be called from either vfs_export
279 * or unmount, so check if it hasn't already been done.
282 if (nfs_pub.np_valid) {
283 nfs_pub.np_valid = 0;
284 if (nfs_pub.np_index != NULL) {
285 FREE(nfs_pub.np_index, M_TEMP);
286 nfs_pub.np_index = NULL;
293 * Only one allowed at a time.
295 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
299 * Get real filehandle for root of exported FS.
301 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
302 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
304 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp, curthread /* XXX */)))
307 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
313 * If an indexfile was specified, pull it in.
315 if (argp->ex_indexfile != NULL) {
316 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP,
318 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
319 MAXNAMLEN, (size_t *)0);
322 * Check for illegal filenames.
324 for (cp = nfs_pub.np_index; *cp; cp++) {
332 FREE(nfs_pub.np_index, M_TEMP);
337 nfs_pub.np_mount = mp;
338 nfs_pub.np_valid = 1;
343 * Used by the filesystems to determine if a given network address
344 * (passed in 'nam') is present in thier exports list, returns a pointer
345 * to struct netcred so that the filesystem can examine it for
346 * access rights (read/write/etc).
348 static struct netcred *
349 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
351 struct netexport *nep;
352 register struct netcred *np;
353 register struct radix_node_head *rnh;
354 struct sockaddr *saddr;
356 nep = mp->mnt_export;
360 if (mp->mnt_flag & MNT_EXPORTED) {
362 * Lookup in the export list first.
366 rnh = nep->ne_rtable[saddr->sa_family];
368 RADIX_NODE_HEAD_LOCK(rnh);
369 np = (struct netcred *)
370 (*rnh->rnh_matchaddr)(saddr, rnh);
371 RADIX_NODE_HEAD_UNLOCK(rnh);
372 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
377 * If no address match, use the default if it exists.
379 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
380 np = &nep->ne_defexported;
386 * XXX: This comment comes from the deprecated ufs_check_export()
387 * XXX: and may not entirely apply, but lacking something better:
388 * This is the generic part of fhtovp called after the underlying
389 * filesystem has validated the file handle.
391 * Verify that a host should have access to a filesystem.
395 vfs_stdcheckexp(mp, nam, extflagsp, credanonp)
397 struct sockaddr *nam;
399 struct ucred **credanonp;
403 np = vfs_export_lookup(mp, nam);
406 *extflagsp = np->netc_exflags;
407 *credanonp = &np->netc_anon;