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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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: releng/6.3/sys/kern/vfs_export.c 173886 2007-11-24 19:45:58Z cvs2svn $");
   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 out:
  183         free(np, M_NETADDR);
  184         return (error);
  185 }
  186 
  187 /* Helper for vfs_free_addrlist. */
  188 /* ARGSUSED */
  189 static int
  190 vfs_free_netcred(rn, w)
  191         struct radix_node *rn;
  192         void *w;
  193 {
  194         register struct radix_node_head *rnh = (struct radix_node_head *) w;
  195 
  196         (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
  197         free(rn, M_NETADDR);
  198         return (0);
  199 }
  200 
  201 /*
  202  * Free the net address hash lists that are hanging off the mount points.
  203  */
  204 static void
  205 vfs_free_addrlist(nep)
  206         struct netexport *nep;
  207 {
  208         register int i;
  209         register struct radix_node_head *rnh;
  210 
  211         for (i = 0; i <= AF_MAX; i++)
  212                 if ((rnh = nep->ne_rtable[i])) {
  213                         RADIX_NODE_HEAD_LOCK(rnh);
  214                         (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
  215                         RADIX_NODE_HEAD_DESTROY(rnh);
  216                         free(rnh, M_RTABLE);
  217                         nep->ne_rtable[i] = NULL;       /* not SMP safe XXX */
  218                 }
  219 }
  220 
  221 /*
  222  * High level function to manipulate export options on a mount point
  223  * and the passed in netexport.
  224  * Struct export_args *argp is the variable used to twiddle options,
  225  * the structure is described in sys/mount.h
  226  */
  227 int
  228 vfs_export(mp, argp)
  229         struct mount *mp;
  230         struct export_args *argp;
  231 {
  232         struct netexport *nep;
  233         int error;
  234 
  235         nep = mp->mnt_export;
  236         if (argp->ex_flags & MNT_DELEXPORT) {
  237                 if (nep == NULL)
  238                         return (ENOENT);
  239                 if (mp->mnt_flag & MNT_EXPUBLIC) {
  240                         vfs_setpublicfs(NULL, NULL, NULL);
  241                         MNT_ILOCK(mp);
  242                         mp->mnt_flag &= ~MNT_EXPUBLIC;
  243                         MNT_IUNLOCK(mp);
  244                 }
  245                 vfs_free_addrlist(nep);
  246                 mp->mnt_export = NULL;
  247                 free(nep, M_MOUNT);
  248                 nep = NULL;
  249                 MNT_ILOCK(mp);
  250                 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
  251                 MNT_IUNLOCK(mp);
  252         }
  253         if (argp->ex_flags & MNT_EXPORTED) {
  254                 if (nep == NULL) {
  255                         nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
  256                         mp->mnt_export = nep;
  257                 }
  258                 if (argp->ex_flags & MNT_EXPUBLIC) {
  259                         if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
  260                                 return (error);
  261                         MNT_ILOCK(mp);
  262                         mp->mnt_flag |= MNT_EXPUBLIC;
  263                         MNT_IUNLOCK(mp);
  264                 }
  265                 if ((error = vfs_hang_addrlist(mp, nep, argp)))
  266                         return (error);
  267                 MNT_ILOCK(mp);
  268                 mp->mnt_flag |= MNT_EXPORTED;
  269                 MNT_IUNLOCK(mp);
  270         }
  271         return (0);
  272 }
  273 
  274 /*
  275  * Set the publicly exported filesystem (WebNFS). Currently, only
  276  * one public filesystem is possible in the spec (RFC 2054 and 2055)
  277  */
  278 int
  279 vfs_setpublicfs(mp, nep, argp)
  280         struct mount *mp;
  281         struct netexport *nep;
  282         struct export_args *argp;
  283 {
  284         int error;
  285         struct vnode *rvp;
  286         char *cp;
  287 
  288         /*
  289          * mp == NULL -> invalidate the current info, the FS is
  290          * no longer exported. May be called from either vfs_export
  291          * or unmount, so check if it hasn't already been done.
  292          */
  293         if (mp == NULL) {
  294                 if (nfs_pub.np_valid) {
  295                         nfs_pub.np_valid = 0;
  296                         if (nfs_pub.np_index != NULL) {
  297                                 FREE(nfs_pub.np_index, M_TEMP);
  298                                 nfs_pub.np_index = NULL;
  299                         }
  300                 }
  301                 return (0);
  302         }
  303 
  304         /*
  305          * Only one allowed at a time.
  306          */
  307         if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
  308                 return (EBUSY);
  309 
  310         /*
  311          * Get real filehandle for root of exported FS.
  312          */
  313         bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
  314         nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
  315 
  316         if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp, curthread /* XXX */)))
  317                 return (error);
  318 
  319         if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
  320                 return (error);
  321 
  322         vput(rvp);
  323 
  324         /*
  325          * If an indexfile was specified, pull it in.
  326          */
  327         if (argp->ex_indexfile != NULL) {
  328                 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP,
  329                     M_WAITOK);
  330                 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
  331                     MAXNAMLEN, (size_t *)0);
  332                 if (!error) {
  333                         /*
  334                          * Check for illegal filenames.
  335                          */
  336                         for (cp = nfs_pub.np_index; *cp; cp++) {
  337                                 if (*cp == '/') {
  338                                         error = EINVAL;
  339                                         break;
  340                                 }
  341                         }
  342                 }
  343                 if (error) {
  344                         FREE(nfs_pub.np_index, M_TEMP);
  345                         return (error);
  346                 }
  347         }
  348 
  349         nfs_pub.np_mount = mp;
  350         nfs_pub.np_valid = 1;
  351         return (0);
  352 }
  353 
  354 /*
  355  * Used by the filesystems to determine if a given network address
  356  * (passed in 'nam') is present in thier exports list, returns a pointer
  357  * to struct netcred so that the filesystem can examine it for
  358  * access rights (read/write/etc).
  359  */
  360 static struct netcred *
  361 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
  362 {
  363         struct netexport *nep;
  364         register struct netcred *np;
  365         register struct radix_node_head *rnh;
  366         struct sockaddr *saddr;
  367 
  368         nep = mp->mnt_export;
  369         if (nep == NULL)
  370                 return (NULL);
  371         np = NULL;
  372         if (mp->mnt_flag & MNT_EXPORTED) {
  373                 /*
  374                  * Lookup in the export list first.
  375                  */
  376                 if (nam != NULL) {
  377                         saddr = nam;
  378                         rnh = nep->ne_rtable[saddr->sa_family];
  379                         if (rnh != NULL) {
  380                                 RADIX_NODE_HEAD_LOCK(rnh);
  381                                 np = (struct netcred *)
  382                                     (*rnh->rnh_matchaddr)(saddr, rnh);
  383                                 RADIX_NODE_HEAD_UNLOCK(rnh);
  384                                 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
  385                                         np = NULL;
  386                         }
  387                 }
  388                 /*
  389                  * If no address match, use the default if it exists.
  390                  */
  391                 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
  392                         np = &nep->ne_defexported;
  393         }
  394         return (np);
  395 }
  396 
  397 /*
  398  * XXX: This comment comes from the deprecated ufs_check_export()
  399  * XXX: and may not entirely apply, but lacking something better:
  400  * This is the generic part of fhtovp called after the underlying
  401  * filesystem has validated the file handle.
  402  *
  403  * Verify that a host should have access to a filesystem.
  404  */
  405 
  406 int 
  407 vfs_stdcheckexp(mp, nam, extflagsp, credanonp)
  408         struct mount *mp;
  409         struct sockaddr *nam;
  410         int *extflagsp;
  411         struct ucred **credanonp;
  412 {
  413         struct netcred *np;
  414 
  415         np = vfs_export_lookup(mp, nam);
  416         if (np == NULL)
  417                 return (EACCES);
  418         *extflagsp = np->netc_exflags;
  419         *credanonp = &np->netc_anon;
  420         return (0);
  421 }
  422 

Cache object: d4e28b5cf9e65f6a8b8a0efe82a272f6


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.