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/socket.h>
   50 #include <sys/systm.h>
   51 #include <sys/vnode.h>
   52 
   53 #include <net/radix.h>
   54 
   55 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
   56 
   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 
   62 /*
   63  * Network address lookup element
   64  */
   65 struct netcred {
   66         struct  radix_node netc_rnodes[2];
   67         int     netc_exflags;
   68         struct  ucred netc_anon;
   69 };
   70 
   71 /*
   72  * Network export information
   73  */
   74 struct netexport {
   75         struct  netcred ne_defexported;               /* Default export */
   76         struct  radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
   77 };
   78 
   79 /*
   80  * Build hash lists of net addresses and hang them off the mount point.
   81  * Called by ufs_mount() to set up the lists of export addresses.
   82  */
   83 static int
   84 vfs_hang_addrlist(mp, nep, argp)
   85         struct mount *mp;
   86         struct netexport *nep;
   87         struct export_args *argp;
   88 {
   89         register struct netcred *np;
   90         register struct radix_node_head *rnh;
   91         register int i;
   92         struct radix_node *rn;
   93         struct sockaddr *saddr, *smask = 0;
   94         struct domain *dom;
   95         int error;
   96 
   97         /*
   98          * XXX: This routine converts from a `struct xucred'
   99          * (argp->ex_anon) to a `struct ucred' (np->netc_anon).  This
  100          * operation is questionable; for example, what should be done
  101          * with fields like cr_uidinfo and cr_prison?  Currently, this
  102          * routine does not touch them (leaves them as NULL).
  103          */
  104         if (argp->ex_anon.cr_version != XUCRED_VERSION)
  105                 return (EINVAL);
  106 
  107         if (argp->ex_addrlen == 0) {
  108                 if (mp->mnt_flag & MNT_DEFEXPORTED)
  109                         return (EPERM);
  110                 np = &nep->ne_defexported;
  111                 np->netc_exflags = argp->ex_flags;
  112                 bzero(&np->netc_anon, sizeof(np->netc_anon));
  113                 np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
  114                 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
  115                 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
  116                     sizeof(np->netc_anon.cr_groups));
  117                 np->netc_anon.cr_ref = 1;
  118                 mp->mnt_flag |= MNT_DEFEXPORTED;
  119                 return (0);
  120         }
  121 
  122 #if MSIZE <= 256
  123         if (argp->ex_addrlen > MLEN)
  124                 return (EINVAL);
  125 #endif
  126 
  127         i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
  128         np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
  129         saddr = (struct sockaddr *) (np + 1);
  130         if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
  131                 goto out;
  132         if (saddr->sa_family > AF_MAX) {
  133                 error = EINVAL;
  134                 goto out;
  135         }
  136         if (saddr->sa_len > argp->ex_addrlen)
  137                 saddr->sa_len = argp->ex_addrlen;
  138         if (argp->ex_masklen) {
  139                 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
  140                 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
  141                 if (error)
  142                         goto out;
  143                 if (smask->sa_len > argp->ex_masklen)
  144                         smask->sa_len = argp->ex_masklen;
  145         }
  146         i = saddr->sa_family;
  147         if ((rnh = nep->ne_rtable[i]) == NULL) {
  148                 /*
  149                  * Seems silly to initialize every AF when most are not used,
  150                  * do so on demand here
  151                  */
  152                 for (dom = domains; dom; dom = dom->dom_next)
  153                         if (dom->dom_family == i && dom->dom_rtattach) {
  154                                 dom->dom_rtattach((void **) &nep->ne_rtable[i],
  155                                     dom->dom_rtoffset);
  156                                 break;
  157                         }
  158                 if ((rnh = nep->ne_rtable[i]) == NULL) {
  159                         error = ENOBUFS;
  160                         goto out;
  161                 }
  162         }
  163         RADIX_NODE_HEAD_LOCK(rnh);
  164         rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes);
  165         RADIX_NODE_HEAD_UNLOCK(rnh);
  166         if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
  167                 error = EPERM;
  168                 goto out;
  169         }
  170         np->netc_exflags = argp->ex_flags;
  171         bzero(&np->netc_anon, sizeof(np->netc_anon));
  172         np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
  173         np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
  174         bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
  175             sizeof(np->netc_anon.cr_groups));
  176         np->netc_anon.cr_ref = 1;
  177         return (0);
  178 out:
  179         free(np, M_NETADDR);
  180         return (error);
  181 }
  182 
  183 /* Helper for vfs_free_addrlist. */
  184 /* ARGSUSED */
  185 static int
  186 vfs_free_netcred(rn, w)
  187         struct radix_node *rn;
  188         void *w;
  189 {
  190         register struct radix_node_head *rnh = (struct radix_node_head *) w;
  191 
  192         (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
  193         free(rn, M_NETADDR);
  194         return (0);
  195 }
  196 
  197 /*
  198  * Free the net address hash lists that are hanging off the mount points.
  199  */
  200 static void
  201 vfs_free_addrlist(nep)
  202         struct netexport *nep;
  203 {
  204         register int i;
  205         register struct radix_node_head *rnh;
  206 
  207         for (i = 0; i <= AF_MAX; i++)
  208                 if ((rnh = nep->ne_rtable[i])) {
  209                         RADIX_NODE_HEAD_LOCK(rnh);
  210                         (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
  211                         RADIX_NODE_HEAD_DESTROY(rnh);
  212                         free(rnh, M_RTABLE);
  213                         nep->ne_rtable[i] = NULL;       /* not SMP safe XXX */
  214                 }
  215 }
  216 
  217 /*
  218  * High level function to manipulate export options on a mount point
  219  * and the passed in netexport.
  220  * Struct export_args *argp is the variable used to twiddle options,
  221  * the structure is described in sys/mount.h
  222  */
  223 int
  224 vfs_export(mp, argp)
  225         struct mount *mp;
  226         struct export_args *argp;
  227 {
  228         struct netexport *nep;
  229         int error;
  230 
  231         nep = mp->mnt_export;
  232         if (argp->ex_flags & MNT_DELEXPORT) {
  233                 if (nep == NULL)
  234                         return (ENOENT);
  235                 if (mp->mnt_flag & MNT_EXPUBLIC) {
  236                         vfs_setpublicfs(NULL, NULL, NULL);
  237                         mp->mnt_flag &= ~MNT_EXPUBLIC;
  238                 }
  239                 vfs_free_addrlist(nep);
  240                 mp->mnt_export = NULL;
  241                 free(nep, M_MOUNT);
  242                 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
  243         }
  244         if (argp->ex_flags & MNT_EXPORTED) {
  245                 if (nep == NULL) {
  246                         nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
  247                         mp->mnt_export = nep;
  248                 }
  249                 if (argp->ex_flags & MNT_EXPUBLIC) {
  250                         if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
  251                                 return (error);
  252                         mp->mnt_flag |= MNT_EXPUBLIC;
  253                 }
  254                 if ((error = vfs_hang_addrlist(mp, nep, argp)))
  255                         return (error);
  256                 mp->mnt_flag |= MNT_EXPORTED;
  257         }
  258         return (0);
  259 }
  260 
  261 /*
  262  * Set the publicly exported filesystem (WebNFS). Currently, only
  263  * one public filesystem is possible in the spec (RFC 2054 and 2055)
  264  */
  265 int
  266 vfs_setpublicfs(mp, nep, argp)
  267         struct mount *mp;
  268         struct netexport *nep;
  269         struct export_args *argp;
  270 {
  271         int error;
  272         struct vnode *rvp;
  273         char *cp;
  274 
  275         /*
  276          * mp == NULL -> invalidate the current info, the FS is
  277          * no longer exported. May be called from either vfs_export
  278          * or unmount, so check if it hasn't already been done.
  279          */
  280         if (mp == NULL) {
  281                 if (nfs_pub.np_valid) {
  282                         nfs_pub.np_valid = 0;
  283                         if (nfs_pub.np_index != NULL) {
  284                                 FREE(nfs_pub.np_index, M_TEMP);
  285                                 nfs_pub.np_index = NULL;
  286                         }
  287                 }
  288                 return (0);
  289         }
  290 
  291         /*
  292          * Only one allowed at a time.
  293          */
  294         if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
  295                 return (EBUSY);
  296 
  297         /*
  298          * Get real filehandle for root of exported FS.
  299          */
  300         bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
  301         nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
  302 
  303         if ((error = VFS_ROOT(mp, &rvp, curthread /* XXX */)))
  304                 return (error);
  305 
  306         if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
  307                 return (error);
  308 
  309         vput(rvp);
  310 
  311         /*
  312          * If an indexfile was specified, pull it in.
  313          */
  314         if (argp->ex_indexfile != NULL) {
  315                 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP,
  316                     M_WAITOK);
  317                 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
  318                     MAXNAMLEN, (size_t *)0);
  319                 if (!error) {
  320                         /*
  321                          * Check for illegal filenames.
  322                          */
  323                         for (cp = nfs_pub.np_index; *cp; cp++) {
  324                                 if (*cp == '/') {
  325                                         error = EINVAL;
  326                                         break;
  327                                 }
  328                         }
  329                 }
  330                 if (error) {
  331                         FREE(nfs_pub.np_index, M_TEMP);
  332                         return (error);
  333                 }
  334         }
  335 
  336         nfs_pub.np_mount = mp;
  337         nfs_pub.np_valid = 1;
  338         return (0);
  339 }
  340 
  341 /*
  342  * Used by the filesystems to determine if a given network address
  343  * (passed in 'nam') is present in thier exports list, returns a pointer
  344  * to struct netcred so that the filesystem can examine it for
  345  * access rights (read/write/etc).
  346  */
  347 struct netcred *
  348 vfs_export_lookup(mp, nam)
  349         register struct mount *mp;
  350         struct sockaddr *nam;
  351 {
  352         struct netexport *nep;
  353         register struct netcred *np;
  354         register struct radix_node_head *rnh;
  355         struct sockaddr *saddr;
  356 
  357         nep = mp->mnt_export;
  358         if (nep == NULL)
  359                 return (NULL);
  360         np = NULL;
  361         if (mp->mnt_flag & MNT_EXPORTED) {
  362                 /*
  363                  * Lookup in the export list first.
  364                  */
  365                 if (nam != NULL) {
  366                         saddr = nam;
  367                         rnh = nep->ne_rtable[saddr->sa_family];
  368                         if (rnh != NULL) {
  369                                 RADIX_NODE_HEAD_LOCK(rnh);
  370                                 np = (struct netcred *)
  371                                     (*rnh->rnh_matchaddr)(saddr, rnh);
  372                                 RADIX_NODE_HEAD_UNLOCK(rnh);
  373                                 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
  374                                         np = NULL;
  375                         }
  376                 }
  377                 /*
  378                  * If no address match, use the default if it exists.
  379                  */
  380                 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
  381                         np = &nep->ne_defexported;
  382         }
  383         return (np);
  384 }
  385 
  386 /*
  387  * XXX: This comment comes from the deprecated ufs_check_export()
  388  * XXX: and may not entirely apply, but lacking something better:
  389  * This is the generic part of fhtovp called after the underlying
  390  * filesystem has validated the file handle.
  391  *
  392  * Verify that a host should have access to a filesystem.
  393  */
  394 
  395 int 
  396 vfs_stdcheckexp(mp, nam, extflagsp, credanonp)
  397         struct mount *mp;
  398         struct sockaddr *nam;
  399         int *extflagsp;
  400         struct ucred **credanonp;
  401 {
  402         struct netcred *np;
  403 
  404         np = vfs_export_lookup(mp, nam);
  405         if (np == NULL)
  406                 return (EACCES);
  407         *extflagsp = np->netc_exflags;
  408         *credanonp = &np->netc_anon;
  409         return (0);
  410 }
  411 

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