vfs_export.c

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    1 /*
    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.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   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  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)vfs_subr.c  8.31 (Berkeley) 5/26/95
   39  * $FreeBSD: releng/5.1/sys/kern/vfs_export.c 111119 2003-02-19 05:47:46Z imp $
   40  */
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/socket.h>
   46 #include <sys/malloc.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/mount.h>
   49 #include <net/radix.h>
   50 #include <sys/domain.h>
   51 #include <sys/dirent.h>
   52 #include <sys/vnode.h>
   53 
   54 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
   55 
   56 static void     vfs_free_addrlist(struct netexport *nep);
   57 static int      vfs_free_netcred(struct radix_node *rn, void *w);
   58 static int      vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
   59                     struct export_args *argp);
   60 
   61 /*
   62  * Network address lookup element
   63  */
   64 struct netcred {
   65         struct  radix_node netc_rnodes[2];
   66         int     netc_exflags;
   67         struct  ucred netc_anon;
   68 };
   69 
   70 /*
   71  * Network export information
   72  */
   73 struct netexport {
   74         struct  netcred ne_defexported;               /* Default export */
   75         struct  radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
   76 };
   77 
   78 /*
   79  * Build hash lists of net addresses and hang them off the mount point.
   80  * Called by ufs_mount() to set up the lists of export addresses.
   81  */
   82 static int
   83 vfs_hang_addrlist(mp, nep, argp)
   84         struct mount *mp;
   85         struct netexport *nep;
   86         struct export_args *argp;
   87 {
   88         register struct netcred *np;
   89         register struct radix_node_head *rnh;
   90         register int i;
   91         struct radix_node *rn;
   92         struct sockaddr *saddr, *smask = 0;
   93         struct domain *dom;
   94         int error;
   95 
   96         /*
   97          * XXX: This routine converts from a `struct xucred'
   98          * (argp->ex_anon) to a `struct ucred' (np->netc_anon).  This
   99          * operation is questionable; for example, what should be done
  100          * with fields like cr_uidinfo and cr_prison?  Currently, this
  101          * routine does not touch them (leaves them as NULL).
  102          */
  103         if (argp->ex_anon.cr_version != XUCRED_VERSION)
  104                 return (EINVAL);
  105 
  106         if (argp->ex_addrlen == 0) {
  107                 if (mp->mnt_flag & MNT_DEFEXPORTED)
  108                         return (EPERM);
  109                 np = &nep->ne_defexported;
  110                 np->netc_exflags = argp->ex_flags;
  111                 bzero(&np->netc_anon, sizeof(np->netc_anon));
  112                 np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
  113                 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
  114                 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
  115                     sizeof(np->netc_anon.cr_groups));
  116                 np->netc_anon.cr_ref = 1;
  117                 mp->mnt_flag |= MNT_DEFEXPORTED;
  118                 return (0);
  119         }
  120 
  121         if (argp->ex_addrlen > MLEN)
  122                 return (EINVAL);
  123 
  124         i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
  125         np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
  126         saddr = (struct sockaddr *) (np + 1);
  127         if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
  128                 goto out;
  129         if (saddr->sa_len > argp->ex_addrlen)
  130                 saddr->sa_len = argp->ex_addrlen;
  131         if (argp->ex_masklen) {
  132                 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
  133                 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
  134                 if (error)
  135                         goto out;
  136                 if (smask->sa_len > argp->ex_masklen)
  137                         smask->sa_len = argp->ex_masklen;
  138         }
  139         i = saddr->sa_family;
  140         if ((rnh = nep->ne_rtable[i]) == NULL) {
  141                 /*
  142                  * Seems silly to initialize every AF when most are not used,
  143                  * do so on demand here
  144                  */
  145                 for (dom = domains; dom; dom = dom->dom_next)
  146                         if (dom->dom_family == i && dom->dom_rtattach) {
  147                                 dom->dom_rtattach((void **) &nep->ne_rtable[i],
  148                                     dom->dom_rtoffset);
  149                                 break;
  150                         }
  151                 if ((rnh = nep->ne_rtable[i]) == NULL) {
  152                         error = ENOBUFS;
  153                         goto out;
  154                 }
  155         }
  156         RADIX_NODE_HEAD_LOCK(rnh);
  157         rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes);
  158         RADIX_NODE_HEAD_UNLOCK(rnh);
  159         if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
  160                 error = EPERM;
  161                 goto out;
  162         }
  163         np->netc_exflags = argp->ex_flags;
  164         bzero(&np->netc_anon, sizeof(np->netc_anon));
  165         np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
  166         np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
  167         bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
  168             sizeof(np->netc_anon.cr_groups));
  169         np->netc_anon.cr_ref = 1;
  170         return (0);
  171 out:
  172         free(np, M_NETADDR);
  173         return (error);
  174 }
  175 
  176 /* Helper for vfs_free_addrlist. */
  177 /* ARGSUSED */
  178 static int
  179 vfs_free_netcred(rn, w)
  180         struct radix_node *rn;
  181         void *w;
  182 {
  183         register struct radix_node_head *rnh = (struct radix_node_head *) w;
  184 
  185         (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
  186         free(rn, M_NETADDR);
  187         return (0);
  188 }
  189 
  190 /*
  191  * Free the net address hash lists that are hanging off the mount points.
  192  */
  193 static void
  194 vfs_free_addrlist(nep)
  195         struct netexport *nep;
  196 {
  197         register int i;
  198         register struct radix_node_head *rnh;
  199 
  200         for (i = 0; i <= AF_MAX; i++)
  201                 if ((rnh = nep->ne_rtable[i])) {
  202                         RADIX_NODE_HEAD_LOCK(rnh);
  203                         (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
  204                         RADIX_NODE_HEAD_DESTROY(rnh);
  205                         free(rnh, M_RTABLE);
  206                         nep->ne_rtable[i] = NULL;       /* not SMP safe XXX */
  207                 }
  208 }
  209 
  210 /*
  211  * High level function to manipulate export options on a mount point
  212  * and the passed in netexport.
  213  * Struct export_args *argp is the variable used to twiddle options,
  214  * the structure is described in sys/mount.h
  215  */
  216 int
  217 vfs_export(mp, argp)
  218         struct mount *mp;
  219         struct export_args *argp;
  220 {
  221         struct netexport *nep;
  222         int error;
  223 
  224         nep = mp->mnt_export;
  225         if (argp->ex_flags & MNT_DELEXPORT) {
  226                 if (nep == NULL)
  227                         return (ENOENT);
  228                 if (mp->mnt_flag & MNT_EXPUBLIC) {
  229                         vfs_setpublicfs(NULL, NULL, NULL);
  230                         mp->mnt_flag &= ~MNT_EXPUBLIC;
  231                 }
  232                 vfs_free_addrlist(nep);
  233                 mp->mnt_export = NULL;
  234                 free(nep, M_MOUNT);
  235                 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
  236         }
  237         if (argp->ex_flags & MNT_EXPORTED) {
  238                 if (nep == NULL) {
  239                         nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
  240                         mp->mnt_export = nep;
  241                 }
  242                 if (argp->ex_flags & MNT_EXPUBLIC) {
  243                         if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
  244                                 return (error);
  245                         mp->mnt_flag |= MNT_EXPUBLIC;
  246                 }
  247                 if ((error = vfs_hang_addrlist(mp, nep, argp)))
  248                         return (error);
  249                 mp->mnt_flag |= MNT_EXPORTED;
  250         }
  251         return (0);
  252 }
  253 
  254 /*
  255  * Set the publicly exported filesystem (WebNFS). Currently, only
  256  * one public filesystem is possible in the spec (RFC 2054 and 2055)
  257  */
  258 int
  259 vfs_setpublicfs(mp, nep, argp)
  260         struct mount *mp;
  261         struct netexport *nep;
  262         struct export_args *argp;
  263 {
  264         int error;
  265         struct vnode *rvp;
  266         char *cp;
  267 
  268         /*
  269          * mp == NULL -> invalidate the current info, the FS is
  270          * no longer exported. May be called from either vfs_export
  271          * or unmount, so check if it hasn't already been done.
  272          */
  273         if (mp == NULL) {
  274                 if (nfs_pub.np_valid) {
  275                         nfs_pub.np_valid = 0;
  276                         if (nfs_pub.np_index != NULL) {
  277                                 FREE(nfs_pub.np_index, M_TEMP);
  278                                 nfs_pub.np_index = NULL;
  279                         }
  280                 }
  281                 return (0);
  282         }
  283 
  284         /*
  285          * Only one allowed at a time.
  286          */
  287         if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
  288                 return (EBUSY);
  289 
  290         /*
  291          * Get real filehandle for root of exported FS.
  292          */
  293         bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
  294         nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
  295 
  296         if ((error = VFS_ROOT(mp, &rvp)))
  297                 return (error);
  298 
  299         if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
  300                 return (error);
  301 
  302         vput(rvp);
  303 
  304         /*
  305          * If an indexfile was specified, pull it in.
  306          */
  307         if (argp->ex_indexfile != NULL) {
  308                 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP,
  309                     M_WAITOK);
  310                 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
  311                     MAXNAMLEN, (size_t *)0);
  312                 if (!error) {
  313                         /*
  314                          * Check for illegal filenames.
  315                          */
  316                         for (cp = nfs_pub.np_index; *cp; cp++) {
  317                                 if (*cp == '/') {
  318                                         error = EINVAL;
  319                                         break;
  320                                 }
  321                         }
  322                 }
  323                 if (error) {
  324                         FREE(nfs_pub.np_index, M_TEMP);
  325                         return (error);
  326                 }
  327         }
  328 
  329         nfs_pub.np_mount = mp;
  330         nfs_pub.np_valid = 1;
  331         return (0);
  332 }
  333 
  334 /*
  335  * Used by the filesystems to determine if a given network address
  336  * (passed in 'nam') is present in thier exports list, returns a pointer
  337  * to struct netcred so that the filesystem can examine it for
  338  * access rights (read/write/etc).
  339  */
  340 struct netcred *
  341 vfs_export_lookup(mp, nam)
  342         register struct mount *mp;
  343         struct sockaddr *nam;
  344 {
  345         struct netexport *nep;
  346         register struct netcred *np;
  347         register struct radix_node_head *rnh;
  348         struct sockaddr *saddr;
  349 
  350         nep = mp->mnt_export;
  351         if (nep == NULL)
  352                 return (NULL);
  353         np = NULL;
  354         if (mp->mnt_flag & MNT_EXPORTED) {
  355                 /*
  356                  * Lookup in the export list first.
  357                  */
  358                 if (nam != NULL) {
  359                         saddr = nam;
  360                         rnh = nep->ne_rtable[saddr->sa_family];
  361                         if (rnh != NULL) {
  362                                 RADIX_NODE_HEAD_LOCK(rnh);
  363                                 np = (struct netcred *)
  364                                     (*rnh->rnh_matchaddr)(saddr, rnh);
  365                                 RADIX_NODE_HEAD_UNLOCK(rnh);
  366                                 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
  367                                         np = NULL;
  368                         }
  369                 }
  370                 /*
  371                  * If no address match, use the default if it exists.
  372                  */
  373                 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
  374                         np = &nep->ne_defexported;
  375         }
  376         return (np);
  377 }
  378 
  379 /*
  380  * XXX: This comment comes from the deprecated ufs_check_export()
  381  * XXX: and may not entirely apply, but lacking something better:
  382  * This is the generic part of fhtovp called after the underlying
  383  * filesystem has validated the file handle.
  384  *
  385  * Verify that a host should have access to a filesystem.
  386  */
  387 
  388 int 
  389 vfs_stdcheckexp(mp, nam, extflagsp, credanonp)
  390         struct mount *mp;
  391         struct sockaddr *nam;
  392         int *extflagsp;
  393         struct ucred **credanonp;
  394 {
  395         struct netcred *np;
  396 
  397         np = vfs_export_lookup(mp, nam);
  398         if (np == NULL)
  399                 return (EACCES);
  400         *extflagsp = np->netc_exflags;
  401         *credanonp = &np->netc_anon;
  402         return (0);
  403 }
  404
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FreeBSD/Linux Kernel Cross Reference sys/kern/vfs_export.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_export.c
