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-rw-r--r--sys/kern/vfs_export.c492
1 files changed, 492 insertions, 0 deletions
diff --git a/sys/kern/vfs_export.c b/sys/kern/vfs_export.c
new file mode 100644
index 0000000..114c23e
--- /dev/null
+++ b/sys/kern/vfs_export.c
@@ -0,0 +1,492 @@
+/*-
+ * Copyright (c) 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/dirent.h>
+#include <sys/domain.h>
+#include <sys/jail.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/mount.h>
+#include <sys/mutex.h>
+#include <sys/rwlock.h>
+#include <sys/refcount.h>
+#include <sys/socket.h>
+#include <sys/systm.h>
+#include <sys/vnode.h>
+
+#include <net/radix.h>
+
+static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure");
+
+static void vfs_free_addrlist(struct netexport *nep);
+static int vfs_free_netcred(struct radix_node *rn, void *w);
+static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
+ struct export_args *argp);
+static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *);
+
+/*
+ * Network address lookup element
+ */
+struct netcred {
+ struct radix_node netc_rnodes[2];
+ int netc_exflags;
+ struct ucred *netc_anon;
+ int netc_numsecflavors;
+ int netc_secflavors[MAXSECFLAVORS];
+};
+
+/*
+ * Network export information
+ */
+struct netexport {
+ struct netcred ne_defexported; /* Default export */
+ struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
+};
+
+/*
+ * Build hash lists of net addresses and hang them off the mount point.
+ * Called by vfs_export() to set up the lists of export addresses.
+ */
+static int
+vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
+ struct export_args *argp)
+{
+ register struct netcred *np;
+ register struct radix_node_head *rnh;
+ register int i;
+ struct radix_node *rn;
+ struct sockaddr *saddr, *smask = 0;
+ struct domain *dom;
+ int error;
+
+ /*
+ * XXX: This routine converts from a `struct xucred'
+ * (argp->ex_anon) to a `struct ucred' (np->netc_anon). This
+ * operation is questionable; for example, what should be done
+ * with fields like cr_uidinfo and cr_prison? Currently, this
+ * routine does not touch them (leaves them as NULL).
+ */
+ if (argp->ex_anon.cr_version != XUCRED_VERSION) {
+ vfs_mount_error(mp, "ex_anon.cr_version: %d != %d",
+ argp->ex_anon.cr_version, XUCRED_VERSION);
+ return (EINVAL);
+ }
+
+ if (argp->ex_addrlen == 0) {
+ if (mp->mnt_flag & MNT_DEFEXPORTED) {
+ vfs_mount_error(mp,
+ "MNT_DEFEXPORTED already set for mount %p", mp);
+ return (EPERM);
+ }
+ np = &nep->ne_defexported;
+ np->netc_exflags = argp->ex_flags;
+ np->netc_anon = crget();
+ np->netc_anon->cr_uid = argp->ex_anon.cr_uid;
+ crsetgroups(np->netc_anon, argp->ex_anon.cr_ngroups,
+ argp->ex_anon.cr_groups);
+ np->netc_anon->cr_prison = &prison0;
+ prison_hold(np->netc_anon->cr_prison);
+ np->netc_numsecflavors = argp->ex_numsecflavors;
+ bcopy(argp->ex_secflavors, np->netc_secflavors,
+ sizeof(np->netc_secflavors));
+ MNT_ILOCK(mp);
+ mp->mnt_flag |= MNT_DEFEXPORTED;
+ MNT_IUNLOCK(mp);
+ return (0);
+ }
+
+#if MSIZE <= 256
+ if (argp->ex_addrlen > MLEN) {
+ vfs_mount_error(mp, "ex_addrlen %d is greater than %d",
+ argp->ex_addrlen, MLEN);
+ return (EINVAL);
+ }
+#endif
+
+ i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
+ np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
+ saddr = (struct sockaddr *) (np + 1);
+ if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
+ goto out;
+ if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) {
+ error = EINVAL;
+ vfs_mount_error(mp, "Invalid saddr->sa_family: %d");
+ goto out;
+ }
+ if (saddr->sa_len > argp->ex_addrlen)
+ saddr->sa_len = argp->ex_addrlen;
+ if (argp->ex_masklen) {
+ smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
+ error = copyin(argp->ex_mask, smask, argp->ex_masklen);
+ if (error)
+ goto out;
+ if (smask->sa_len > argp->ex_masklen)
+ smask->sa_len = argp->ex_masklen;
+ }
+ i = saddr->sa_family;
+ if ((rnh = nep->ne_rtable[i]) == NULL) {
+ /*
+ * Seems silly to initialize every AF when most are not used,
+ * do so on demand here
+ */
+ for (dom = domains; dom; dom = dom->dom_next) {
+ KASSERT(((i == AF_INET) || (i == AF_INET6)),
+ ("unexpected protocol in vfs_hang_addrlist"));
+ if (dom->dom_family == i && dom->dom_rtattach) {
+ /*
+ * XXX MRT
+ * The INET and INET6 domains know the
+ * offset already. We don't need to send it
+ * So we just use it as a flag to say that
+ * we are or are not setting up a real routing
+ * table. Only IP and IPV6 need have this
+ * be 0 so all other protocols can stay the
+ * same (ABI compatible).
+ */
+ dom->dom_rtattach(
+ (void **) &nep->ne_rtable[i], 0);
+ break;
+ }
+ }
+ if ((rnh = nep->ne_rtable[i]) == NULL) {
+ error = ENOBUFS;
+ vfs_mount_error(mp, "%s %s %d",
+ "Unable to initialize radix node head ",
+ "for address family", i);
+ goto out;
+ }
+ }
+ RADIX_NODE_HEAD_LOCK(rnh);
+ rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes);
+ RADIX_NODE_HEAD_UNLOCK(rnh);
+ if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
+ error = EPERM;
+ vfs_mount_error(mp, "Invalid radix node head, rn: %p %p",
+ rn, np);
+ goto out;
+ }
+ np->netc_exflags = argp->ex_flags;
+ np->netc_anon = crget();
+ np->netc_anon->cr_uid = argp->ex_anon.cr_uid;
+ crsetgroups(np->netc_anon, argp->ex_anon.cr_ngroups,
+ argp->ex_anon.cr_groups);
+ np->netc_anon->cr_prison = &prison0;
+ prison_hold(np->netc_anon->cr_prison);
+ np->netc_numsecflavors = argp->ex_numsecflavors;
+ bcopy(argp->ex_secflavors, np->netc_secflavors,
+ sizeof(np->netc_secflavors));
+ return (0);
+out:
+ free(np, M_NETADDR);
+ return (error);
+}
+
+/* Helper for vfs_free_addrlist. */
+/* ARGSUSED */
+static int
+vfs_free_netcred(struct radix_node *rn, void *w)
+{
+ struct radix_node_head *rnh = (struct radix_node_head *) w;
+ struct ucred *cred;
+
+ (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
+ cred = ((struct netcred *)rn)->netc_anon;
+ if (cred != NULL)
+ crfree(cred);
+ free(rn, M_NETADDR);
+ return (0);
+}
+
+/*
+ * Free the net address hash lists that are hanging off the mount points.
+ */
+static void
+vfs_free_addrlist(struct netexport *nep)
+{
+ int i;
+ struct radix_node_head *rnh;
+ struct ucred *cred;
+
+ for (i = 0; i <= AF_MAX; i++) {
+ if ((rnh = nep->ne_rtable[i])) {
+ RADIX_NODE_HEAD_LOCK(rnh);
+ (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
+ RADIX_NODE_HEAD_UNLOCK(rnh);
+ RADIX_NODE_HEAD_DESTROY(rnh);
+ free(rnh, M_RTABLE);
+ nep->ne_rtable[i] = NULL; /* not SMP safe XXX */
+ }
+ }
+ cred = nep->ne_defexported.netc_anon;
+ if (cred != NULL)
+ crfree(cred);
+
+}
+
+/*
+ * High level function to manipulate export options on a mount point
+ * and the passed in netexport.
+ * Struct export_args *argp is the variable used to twiddle options,
+ * the structure is described in sys/mount.h
+ */
+int
+vfs_export(struct mount *mp, struct export_args *argp)
+{
+ struct netexport *nep;
+ int error;
+
+ if (argp->ex_numsecflavors < 0
+ || argp->ex_numsecflavors >= MAXSECFLAVORS)
+ return (EINVAL);
+
+ error = 0;
+ lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL);
+ nep = mp->mnt_export;
+ if (argp->ex_flags & MNT_DELEXPORT) {
+ if (nep == NULL) {
+ error = ENOENT;
+ goto out;
+ }
+ if (mp->mnt_flag & MNT_EXPUBLIC) {
+ vfs_setpublicfs(NULL, NULL, NULL);
+ MNT_ILOCK(mp);
+ mp->mnt_flag &= ~MNT_EXPUBLIC;
+ MNT_IUNLOCK(mp);
+ }
+ vfs_free_addrlist(nep);
+ mp->mnt_export = NULL;
+ free(nep, M_MOUNT);
+ nep = NULL;
+ MNT_ILOCK(mp);
+ mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
+ MNT_IUNLOCK(mp);
+ }
+ if (argp->ex_flags & MNT_EXPORTED) {
+ if (nep == NULL) {
+ nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
+ mp->mnt_export = nep;
+ }
+ if (argp->ex_flags & MNT_EXPUBLIC) {
+ if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
+ goto out;
+ MNT_ILOCK(mp);
+ mp->mnt_flag |= MNT_EXPUBLIC;
+ MNT_IUNLOCK(mp);
+ }
+ if ((error = vfs_hang_addrlist(mp, nep, argp)))
+ goto out;
+ MNT_ILOCK(mp);
+ mp->mnt_flag |= MNT_EXPORTED;
+ MNT_IUNLOCK(mp);
+ }
+
+out:
+ lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
+ /*
+ * Once we have executed the vfs_export() command, we do
+ * not want to keep the "export" option around in the
+ * options list, since that will cause subsequent MNT_UPDATE
+ * calls to fail. The export information is saved in
+ * mp->mnt_export, so we can safely delete the "export" mount option
+ * here.
+ */
+ vfs_deleteopt(mp->mnt_optnew, "export");
+ vfs_deleteopt(mp->mnt_opt, "export");
+ return (error);
+}
+
+/*
+ * Set the publicly exported filesystem (WebNFS). Currently, only
+ * one public filesystem is possible in the spec (RFC 2054 and 2055)
+ */
+int
+vfs_setpublicfs(struct mount *mp, struct netexport *nep,
+ struct export_args *argp)
+{
+ int error;
+ struct vnode *rvp;
+ char *cp;
+
+ /*
+ * mp == NULL -> invalidate the current info, the FS is
+ * no longer exported. May be called from either vfs_export
+ * or unmount, so check if it hasn't already been done.
+ */
+ if (mp == NULL) {
+ if (nfs_pub.np_valid) {
+ nfs_pub.np_valid = 0;
+ if (nfs_pub.np_index != NULL) {
+ free(nfs_pub.np_index, M_TEMP);
+ nfs_pub.np_index = NULL;
+ }
+ }
+ return (0);
+ }
+
+ /*
+ * Only one allowed at a time.
+ */
+ if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
+ return (EBUSY);
+
+ /*
+ * Get real filehandle for root of exported FS.
+ */
+ bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
+ nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
+
+ if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp)))
+ return (error);
+
+ if ((error = VOP_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
+ return (error);
+
+ vput(rvp);
+
+ /*
+ * If an indexfile was specified, pull it in.
+ */
+ if (argp->ex_indexfile != NULL) {
+ if (nfs_pub.np_index != NULL)
+ nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP,
+ M_WAITOK);
+ error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
+ MAXNAMLEN, (size_t *)0);
+ if (!error) {
+ /*
+ * Check for illegal filenames.
+ */
+ for (cp = nfs_pub.np_index; *cp; cp++) {
+ if (*cp == '/') {
+ error = EINVAL;
+ break;
+ }
+ }
+ }
+ if (error) {
+ free(nfs_pub.np_index, M_TEMP);
+ nfs_pub.np_index = NULL;
+ return (error);
+ }
+ }
+
+ nfs_pub.np_mount = mp;
+ nfs_pub.np_valid = 1;
+ return (0);
+}
+
+/*
+ * Used by the filesystems to determine if a given network address
+ * (passed in 'nam') is present in their exports list, returns a pointer
+ * to struct netcred so that the filesystem can examine it for
+ * access rights (read/write/etc).
+ */
+static struct netcred *
+vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
+{
+ struct netexport *nep;
+ register struct netcred *np;
+ register struct radix_node_head *rnh;
+ struct sockaddr *saddr;
+
+ nep = mp->mnt_export;
+ if (nep == NULL)
+ return (NULL);
+ np = NULL;
+ if (mp->mnt_flag & MNT_EXPORTED) {
+ /*
+ * Lookup in the export list first.
+ */
+ if (nam != NULL) {
+ saddr = nam;
+ rnh = nep->ne_rtable[saddr->sa_family];
+ if (rnh != NULL) {
+ RADIX_NODE_HEAD_RLOCK(rnh);
+ np = (struct netcred *)
+ (*rnh->rnh_matchaddr)(saddr, rnh);
+ RADIX_NODE_HEAD_RUNLOCK(rnh);
+ if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
+ np = NULL;
+ }
+ }
+ /*
+ * If no address match, use the default if it exists.
+ */
+ if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
+ np = &nep->ne_defexported;
+ }
+ return (np);
+}
+
+/*
+ * XXX: This comment comes from the deprecated ufs_check_export()
+ * XXX: and may not entirely apply, but lacking something better:
+ * This is the generic part of fhtovp called after the underlying
+ * filesystem has validated the file handle.
+ *
+ * Verify that a host should have access to a filesystem.
+ */
+
+int
+vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, int *extflagsp,
+ struct ucred **credanonp, int *numsecflavors, int **secflavors)
+{
+ struct netcred *np;
+
+ lockmgr(&mp->mnt_explock, LK_SHARED, NULL);
+ np = vfs_export_lookup(mp, nam);
+ if (np == NULL) {
+ lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
+ *credanonp = NULL;
+ return (EACCES);
+ }
+ *extflagsp = np->netc_exflags;
+ if ((*credanonp = np->netc_anon) != NULL)
+ crhold(*credanonp);
+ if (numsecflavors)
+ *numsecflavors = np->netc_numsecflavors;
+ if (secflavors)
+ *secflavors = np->netc_secflavors;
+ lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
+ return (0);
+}
+
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