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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10 * the permission of UNIX System Laboratories, Inc.
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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];
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 `struct xucred'
125 * (argp->ex_anon) 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_anon.cr_version != XUCRED_VERSION) {
131 vfs_mount_error(mp, "ex_anon.cr_version: %d != %d",
132 argp->ex_anon.cr_version, XUCRED_VERSION);
136 if (argp->ex_addrlen == 0) {
137 if (mp->mnt_flag & MNT_DEFEXPORTED) {
139 "MNT_DEFEXPORTED already set for mount %p", mp);
142 np = &nep->ne_defexported;
143 np->netc_exflags = argp->ex_flags;
144 np->netc_anon = crget();
145 np->netc_anon->cr_uid = argp->ex_anon.cr_uid;
146 crsetgroups(np->netc_anon, argp->ex_anon.cr_ngroups,
147 argp->ex_anon.cr_groups);
148 np->netc_anon->cr_prison = &prison0;
149 prison_hold(np->netc_anon->cr_prison);
150 np->netc_numsecflavors = argp->ex_numsecflavors;
151 bcopy(argp->ex_secflavors, np->netc_secflavors,
152 sizeof(np->netc_secflavors));
154 mp->mnt_flag |= MNT_DEFEXPORTED;
160 if (argp->ex_addrlen > MLEN) {
161 vfs_mount_error(mp, "ex_addrlen %d is greater than %d",
162 argp->ex_addrlen, MLEN);
167 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
168 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
169 saddr = (struct sockaddr *) (np + 1);
170 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
172 if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) {
174 vfs_mount_error(mp, "Invalid saddr->sa_family: %d");
177 if (saddr->sa_len > argp->ex_addrlen)
178 saddr->sa_len = argp->ex_addrlen;
179 if (argp->ex_masklen) {
180 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
181 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
184 if (smask->sa_len > argp->ex_masklen)
185 smask->sa_len = argp->ex_masklen;
188 switch (saddr->sa_family) {
191 if ((rnh = nep->ne4) == NULL) {
192 off = offsetof(struct sockaddr_in, sin_addr) << 3;
193 rnh = vfs_create_addrlist_af(&nep->ne4, off);
199 if ((rnh = nep->ne6) == NULL) {
200 off = offsetof(struct sockaddr_in6, sin6_addr) << 3;
201 rnh = vfs_create_addrlist_af(&nep->ne6, off);
208 vfs_mount_error(mp, "%s %s %d",
209 "Unable to initialize radix node head ",
210 "for address family", saddr->sa_family);
213 RADIX_NODE_HEAD_LOCK(rnh);
214 rn = (*rnh->rnh_addaddr)(saddr, smask, &rnh->rh, np->netc_rnodes);
215 RADIX_NODE_HEAD_UNLOCK(rnh);
216 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
219 "netcred already exists for given addr/mask");
222 np->netc_exflags = argp->ex_flags;
223 np->netc_anon = crget();
224 np->netc_anon->cr_uid = argp->ex_anon.cr_uid;
225 crsetgroups(np->netc_anon, argp->ex_anon.cr_ngroups,
226 argp->ex_anon.cr_groups);
227 np->netc_anon->cr_prison = &prison0;
228 prison_hold(np->netc_anon->cr_prison);
229 np->netc_numsecflavors = argp->ex_numsecflavors;
230 bcopy(argp->ex_secflavors, np->netc_secflavors,
231 sizeof(np->netc_secflavors));
238 /* Helper for vfs_free_addrlist. */
241 vfs_free_netcred(struct radix_node *rn, void *w)
243 struct radix_node_head *rnh = (struct radix_node_head *) w;
246 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, &rnh->rh);
247 cred = ((struct netcred *)rn)->netc_anon;
254 #if defined(INET) || defined(INET6)
255 static struct radix_node_head *
256 vfs_create_addrlist_af(struct radix_node_head **prnh, int off)
259 if (rn_inithead((void **)prnh, off) == 0)
261 RADIX_NODE_HEAD_LOCK_INIT(*prnh);
267 vfs_free_addrlist_af(struct radix_node_head **prnh)
269 struct radix_node_head *rnh;
272 RADIX_NODE_HEAD_LOCK(rnh);
273 (*rnh->rnh_walktree)(&rnh->rh, vfs_free_netcred, rnh);
274 RADIX_NODE_HEAD_UNLOCK(rnh);
275 RADIX_NODE_HEAD_DESTROY(rnh);
276 rn_detachhead((void **)prnh);
281 * Free the net address hash lists that are hanging off the mount points.
284 vfs_free_addrlist(struct netexport *nep)
288 if (nep->ne4 != NULL)
289 vfs_free_addrlist_af(&nep->ne4);
290 if (nep->ne6 != NULL)
291 vfs_free_addrlist_af(&nep->ne6);
293 cred = nep->ne_defexported.netc_anon;
300 * High level function to manipulate export options on a mount point
301 * and the passed in netexport.
302 * Struct export_args *argp is the variable used to twiddle options,
303 * the structure is described in sys/mount.h
306 vfs_export(struct mount *mp, struct export_args *argp)
308 struct netexport *nep;
311 if ((argp->ex_flags & (MNT_DELEXPORT | MNT_EXPORTED)) == 0)
314 if ((argp->ex_flags & MNT_EXPORTED) != 0 &&
315 (argp->ex_numsecflavors < 0
316 || argp->ex_numsecflavors >= MAXSECFLAVORS))
320 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL);
321 nep = mp->mnt_export;
322 if (argp->ex_flags & MNT_DELEXPORT) {
327 if (mp->mnt_flag & MNT_EXPUBLIC) {
328 vfs_setpublicfs(NULL, NULL, NULL);
330 mp->mnt_flag &= ~MNT_EXPUBLIC;
333 vfs_free_addrlist(nep);
334 mp->mnt_export = NULL;
338 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
341 if (argp->ex_flags & MNT_EXPORTED) {
343 nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
344 mp->mnt_export = nep;
346 if (argp->ex_flags & MNT_EXPUBLIC) {
347 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
350 mp->mnt_flag |= MNT_EXPUBLIC;
353 if (argp->ex_numsecflavors == 0) {
354 argp->ex_numsecflavors = 1;
355 argp->ex_secflavors[0] = AUTH_SYS;
357 if ((error = vfs_hang_addrlist(mp, nep, argp)))
360 mp->mnt_flag |= MNT_EXPORTED;
365 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
367 * Once we have executed the vfs_export() command, we do
368 * not want to keep the "export" option around in the
369 * options list, since that will cause subsequent MNT_UPDATE
370 * calls to fail. The export information is saved in
371 * mp->mnt_export, so we can safely delete the "export" mount option
374 vfs_deleteopt(mp->mnt_optnew, "export");
375 vfs_deleteopt(mp->mnt_opt, "export");
380 * Set the publicly exported filesystem (WebNFS). Currently, only
381 * one public filesystem is possible in the spec (RFC 2054 and 2055)
384 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
385 struct export_args *argp)
392 * mp == NULL -> invalidate the current info, the FS is
393 * no longer exported. May be called from either vfs_export
394 * or unmount, so check if it hasn't already been done.
397 if (nfs_pub.np_valid) {
398 nfs_pub.np_valid = 0;
399 if (nfs_pub.np_index != NULL) {
400 free(nfs_pub.np_index, M_TEMP);
401 nfs_pub.np_index = NULL;
408 * Only one allowed at a time.
410 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
414 * Get real filehandle for root of exported FS.
416 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
417 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
419 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp)))
422 if ((error = VOP_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
428 * If an indexfile was specified, pull it in.
430 if (argp->ex_indexfile != NULL) {
431 if (nfs_pub.np_index == NULL)
432 nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP,
434 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
435 MAXNAMLEN, (size_t *)0);
438 * Check for illegal filenames.
440 for (cp = nfs_pub.np_index; *cp; cp++) {
448 free(nfs_pub.np_index, M_TEMP);
449 nfs_pub.np_index = NULL;
454 nfs_pub.np_mount = mp;
455 nfs_pub.np_valid = 1;
460 * Used by the filesystems to determine if a given network address
461 * (passed in 'nam') is present in their exports list, returns a pointer
462 * to struct netcred so that the filesystem can examine it for
463 * access rights (read/write/etc).
465 static struct netcred *
466 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
468 RADIX_NODE_HEAD_RLOCK_TRACKER;
469 struct netexport *nep;
470 struct netcred *np = NULL;
471 struct radix_node_head *rnh;
472 struct sockaddr *saddr;
474 nep = mp->mnt_export;
477 if ((mp->mnt_flag & MNT_EXPORTED) == 0)
481 * Lookup in the export list
486 switch (saddr->sa_family) {
495 RADIX_NODE_HEAD_RLOCK(rnh);
496 np = (struct netcred *) (*rnh->rnh_matchaddr)(saddr, &rnh->rh);
497 RADIX_NODE_HEAD_RUNLOCK(rnh);
498 if (np != NULL && (np->netc_rnodes->rn_flags & RNF_ROOT) != 0)
504 * If no address match, use the default if it exists.
506 if (np == NULL && (mp->mnt_flag & MNT_DEFEXPORTED) != 0)
507 return (&nep->ne_defexported);
513 * XXX: This comment comes from the deprecated ufs_check_export()
514 * XXX: and may not entirely apply, but lacking something better:
515 * This is the generic part of fhtovp called after the underlying
516 * filesystem has validated the file handle.
518 * Verify that a host should have access to a filesystem.
522 vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, int *extflagsp,
523 struct ucred **credanonp, int *numsecflavors, int **secflavors)
527 lockmgr(&mp->mnt_explock, LK_SHARED, NULL);
528 np = vfs_export_lookup(mp, nam);
530 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
534 *extflagsp = np->netc_exflags;
535 if ((*credanonp = np->netc_anon) != NULL)
538 *numsecflavors = np->netc_numsecflavors;
539 KASSERT(*numsecflavors > 0,
540 ("%s: numsecflavors <= 0", __func__));
541 KASSERT(*numsecflavors < MAXSECFLAVORS,
542 ("%s: numsecflavors >= MAXSECFLAVORS", __func__));
545 *secflavors = np->netc_secflavors;
546 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);