The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/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  * 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.
   21  *
   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
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)vfs_subr.c  8.31 (Berkeley) 5/26/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include <sys/param.h>
   41 #include <sys/dirent.h>
   42 #include <sys/domain.h>
   43 #include <sys/kernel.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mbuf.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>
   53 
   54 #include <net/radix.h>
   55 
   56 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
   57 
   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 *);
   63 
   64 /*
   65  * Network address lookup element
   66  */
   67 struct netcred {
   68         struct  radix_node netc_rnodes[2];
   69         int     netc_exflags;
   70         struct  ucred netc_anon;
   71 };
   72 
   73 /*
   74  * Network export information
   75  */
   76 struct netexport {
   77         struct  netcred ne_defexported;               /* Default export */
   78         struct  radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
   79 };
   80 
   81 /*
   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.
   84  */
   85 static int
   86 vfs_hang_addrlist(mp, nep, argp)
   87         struct mount *mp;
   88         struct netexport *nep;
   89         struct export_args *argp;
   90 {
   91         register struct netcred *np;
   92         register struct radix_node_head *rnh;
   93         register int i;
   94         struct radix_node *rn;
   95         struct sockaddr *saddr, *smask = 0;
   96         struct domain *dom;
   97         int error;
   98 
   99         /*
  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).
  105          */
  106         if (argp->ex_anon.cr_version != XUCRED_VERSION)
  107                 return (EINVAL);
  108 
  109         if (argp->ex_addrlen == 0) {
  110                 if (mp->mnt_flag & MNT_DEFEXPORTED)
  111                         return (EPERM);
  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                 MNT_ILOCK(mp);
  121                 mp->mnt_flag |= MNT_DEFEXPORTED;
  122                 MNT_IUNLOCK(mp);
  123                 return (0);
  124         }
  125 
  126 #if MSIZE <= 256
  127         if (argp->ex_addrlen > MLEN)
  128                 return (EINVAL);
  129 #endif
  130 
  131         i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
  132         np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
  133         saddr = (struct sockaddr *) (np + 1);
  134         if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
  135                 goto out;
  136         if (saddr->sa_family > AF_MAX) {
  137                 error = EINVAL;
  138                 goto out;
  139         }
  140         if (saddr->sa_len > argp->ex_addrlen)
  141                 saddr->sa_len = argp->ex_addrlen;
  142         if (argp->ex_masklen) {
  143                 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
  144                 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
  145                 if (error)
  146                         goto out;
  147                 if (smask->sa_len > argp->ex_masklen)
  148                         smask->sa_len = argp->ex_masklen;
  149         }
  150         i = saddr->sa_family;
  151         if ((rnh = nep->ne_rtable[i]) == NULL) {
  152                 /*
  153                  * Seems silly to initialize every AF when most are not used,
  154                  * do so on demand here
  155                  */
  156                 for (dom = domains; dom; dom = dom->dom_next)
  157                         if (dom->dom_family == i && dom->dom_rtattach) {
  158                                 dom->dom_rtattach((void **) &nep->ne_rtable[i],
  159                                     dom->dom_rtoffset);
  160                                 break;
  161                         }
  162                 if ((rnh = nep->ne_rtable[i]) == NULL) {
  163                         error = ENOBUFS;
  164                         goto out;
  165                 }
  166         }
  167         RADIX_NODE_HEAD_LOCK(rnh);
  168         rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes);
  169         RADIX_NODE_HEAD_UNLOCK(rnh);
  170         if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
  171                 error = EPERM;
  172                 goto out;
  173         }
  174         np->netc_exflags = argp->ex_flags;
  175         bzero(&np->netc_anon, sizeof(np->netc_anon));
  176         np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
  177         np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
  178         bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
  179             sizeof(np->netc_anon.cr_groups));
  180         refcount_init(&np->netc_anon.cr_ref, 1);
  181         return (0);
  182 
  183 out:
  184         free(np, M_NETADDR);
  185         return (error);
  186 }
  187 
  188 /* Helper for vfs_free_addrlist. */
  189 /* ARGSUSED */
  190 static int
  191 vfs_free_netcred(rn, w)
  192         struct radix_node *rn;
  193         void *w;
  194 {
  195         register struct radix_node_head *rnh = (struct radix_node_head *) w;
  196 
  197         (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
  198         free(rn, M_NETADDR);
  199         return (0);
  200 }
  201 
  202 /*
  203  * Free the net address hash lists that are hanging off the mount points.
  204  */
  205 static void
  206 vfs_free_addrlist(nep)
  207         struct netexport *nep;
  208 {
  209         register int i;
  210         register struct radix_node_head *rnh;
  211 
  212         for (i = 0; i <= AF_MAX; i++)
  213                 if ((rnh = nep->ne_rtable[i])) {
  214                         RADIX_NODE_HEAD_LOCK(rnh);
  215                         (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
  216                         RADIX_NODE_HEAD_DESTROY(rnh);
  217                         free(rnh, M_RTABLE);
  218                         nep->ne_rtable[i] = NULL;       /* not SMP safe XXX */
  219                 }
  220 }
  221 
  222 /*
  223  * High level function to manipulate export options on a mount point
  224  * and the passed in netexport.
  225  * Struct export_args *argp is the variable used to twiddle options,
  226  * the structure is described in sys/mount.h
  227  */
  228 int
  229 vfs_export(mp, argp)
  230         struct mount *mp;
  231         struct export_args *argp;
  232 {
  233         struct netexport *nep;
  234         int error;
  235 
  236         error = 0;
  237         lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL, curthread);
  238         nep = mp->mnt_export;
  239         if (argp->ex_flags & MNT_DELEXPORT) {
  240                 if (nep == NULL) {
  241                         error = ENOENT;
  242                         goto out;
  243                 }
  244                 if (mp->mnt_flag & MNT_EXPUBLIC) {
  245                         vfs_setpublicfs(NULL, NULL, NULL);
  246                         MNT_ILOCK(mp);
  247                         mp->mnt_flag &= ~MNT_EXPUBLIC;
  248                         MNT_IUNLOCK(mp);
  249                 }
  250                 vfs_free_addrlist(nep);
  251                 mp->mnt_export = NULL;
  252                 free(nep, M_MOUNT);
  253                 nep = NULL;
  254                 MNT_ILOCK(mp);
  255                 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
  256                 MNT_IUNLOCK(mp);
  257         }
  258         if (argp->ex_flags & MNT_EXPORTED) {
  259                 if (nep == NULL) {
  260                         nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
  261                         mp->mnt_export = nep;
  262                 }
  263                 if (argp->ex_flags & MNT_EXPUBLIC) {
  264                         if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
  265                                 goto out;
  266                         MNT_ILOCK(mp);
  267                         mp->mnt_flag |= MNT_EXPUBLIC;
  268                         MNT_IUNLOCK(mp);
  269                 }
  270                 if ((error = vfs_hang_addrlist(mp, nep, argp)))
  271                         goto out;
  272                 MNT_ILOCK(mp);
  273                 mp->mnt_flag |= MNT_EXPORTED;
  274                 MNT_IUNLOCK(mp);
  275         }
  276 out:
  277         lockmgr(&mp->mnt_explock, LK_RELEASE, NULL, curthread);
  278         return (error);
  279 }
  280 
  281 /*
  282  * Set the publicly exported filesystem (WebNFS). Currently, only
  283  * one public filesystem is possible in the spec (RFC 2054 and 2055)
  284  */
  285 int
  286 vfs_setpublicfs(mp, nep, argp)
  287         struct mount *mp;
  288         struct netexport *nep;
  289         struct export_args *argp;
  290 {
  291         int error;
  292         struct vnode *rvp;
  293         char *cp;
  294 
  295         /*
  296          * mp == NULL -> invalidate the current info, the FS is
  297          * no longer exported. May be called from either vfs_export
  298          * or unmount, so check if it hasn't already been done.
  299          */
  300         if (mp == NULL) {
  301                 if (nfs_pub.np_valid) {
  302                         nfs_pub.np_valid = 0;
  303                         if (nfs_pub.np_index != NULL) {
  304                                 FREE(nfs_pub.np_index, M_TEMP);
  305                                 nfs_pub.np_index = NULL;
  306                         }
  307                 }
  308                 return (0);
  309         }
  310 
  311         /*
  312          * Only one allowed at a time.
  313          */
  314         if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
  315                 return (EBUSY);
  316 
  317         /*
  318          * Get real filehandle for root of exported FS.
  319          */
  320         bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
  321         nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
  322 
  323         if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp, curthread /* XXX */)))
  324                 return (error);
  325 
  326         if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
  327                 return (error);
  328 
  329         vput(rvp);
  330 
  331         /*
  332          * If an indexfile was specified, pull it in.
  333          */
  334         if (argp->ex_indexfile != NULL) {
  335                 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP,
  336                     M_WAITOK);
  337                 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
  338                     MAXNAMLEN, (size_t *)0);
  339                 if (!error) {
  340                         /*
  341                          * Check for illegal filenames.
  342                          */
  343                         for (cp = nfs_pub.np_index; *cp; cp++) {
  344                                 if (*cp == '/') {
  345                                         error = EINVAL;
  346                                         break;
  347                                 }
  348                         }
  349                 }
  350                 if (error) {
  351                         FREE(nfs_pub.np_index, M_TEMP);
  352                         return (error);
  353                 }
  354         }
  355 
  356         nfs_pub.np_mount = mp;
  357         nfs_pub.np_valid = 1;
  358         return (0);
  359 }
  360 
  361 /*
  362  * Used by the filesystems to determine if a given network address
  363  * (passed in 'nam') is present in thier exports list, returns a pointer
  364  * to struct netcred so that the filesystem can examine it for
  365  * access rights (read/write/etc).
  366  */
  367 static struct netcred *
  368 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
  369 {
  370         struct netexport *nep;
  371         register struct netcred *np;
  372         register struct radix_node_head *rnh;
  373         struct sockaddr *saddr;
  374 
  375         nep = mp->mnt_export;
  376         if (nep == NULL)
  377                 return (NULL);
  378         np = NULL;
  379         if (mp->mnt_flag & MNT_EXPORTED) {
  380                 /*
  381                  * Lookup in the export list first.
  382                  */
  383                 if (nam != NULL) {
  384                         saddr = nam;
  385                         rnh = nep->ne_rtable[saddr->sa_family];
  386                         if (rnh != NULL) {
  387                                 RADIX_NODE_HEAD_LOCK(rnh);
  388                                 np = (struct netcred *)
  389                                     (*rnh->rnh_matchaddr)(saddr, rnh);
  390                                 RADIX_NODE_HEAD_UNLOCK(rnh);
  391                                 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
  392                                         np = NULL;
  393                         }
  394                 }
  395                 /*
  396                  * If no address match, use the default if it exists.
  397                  */
  398                 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
  399                         np = &nep->ne_defexported;
  400         }
  401         return (np);
  402 }
  403 
  404 /*
  405  * XXX: This comment comes from the deprecated ufs_check_export()
  406  * XXX: and may not entirely apply, but lacking something better:
  407  * This is the generic part of fhtovp called after the underlying
  408  * filesystem has validated the file handle.
  409  *
  410  * Verify that a host should have access to a filesystem.
  411  */
  412 
  413 int 
  414 vfs_stdcheckexp(mp, nam, extflagsp, credanonp)
  415         struct mount *mp;
  416         struct sockaddr *nam;
  417         int *extflagsp;
  418         struct ucred **credanonp;
  419 {
  420         struct netcred *np;
  421 
  422         lockmgr(&mp->mnt_explock, LK_SHARED, NULL, curthread);
  423         np = vfs_export_lookup(mp, nam);
  424         lockmgr(&mp->mnt_explock, LK_RELEASE, NULL, curthread);
  425         if (np == NULL)
  426                 return (EACCES);
  427         *extflagsp = np->netc_exflags;
  428         *credanonp = &np->netc_anon;
  429         return (0);
  430 }
  431 

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