3795613d1d
be modified and do not have to remain on the vendor branch. http://opensource.nailabs.com/lomac/index.html Sponsored by: DARPA, NAI Labs (CBOSS project)
128 lines
4.2 KiB
C
128 lines
4.2 KiB
C
/*-
|
|
* Copyright (c) 2001 Networks Associates Technologies, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed for the FreeBSD Project by NAI Labs, the
|
|
* Security Research Division of Network Associates, Inc. under
|
|
* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
|
|
* CHATS research program.
|
|
*
|
|
* 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.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*
|
|
* $Id$
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/namei.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_extern.h>
|
|
|
|
#include "lomacfs.h"
|
|
#include "kernel_plm.h"
|
|
|
|
int
|
|
lomacfs_node_alloc(struct mount *mp, struct componentname *cnp,
|
|
struct vnode *dvp, struct vnode *lowervp, struct vnode **vpp) {
|
|
lomac_object_t lobj;
|
|
struct thread *td = curthread;
|
|
struct vnode *vp;
|
|
struct lomac_node *lp;
|
|
lattr_t subjlattr, objlattr;
|
|
int error;
|
|
|
|
KASSERT((cnp == NULL) == (dvp == NULL),
|
|
("lomacfs_node_alloc: dvp and cnp do not match"));
|
|
lp = malloc(sizeof(*lp), M_LOMACFS, M_WAITOK);
|
|
if (dvp != NULL) {
|
|
error = cache_lookup(dvp, vpp, cnp);
|
|
if (error == -1) { /* lost the race; return EEXIST and the vp */
|
|
vput(lowervp);
|
|
error = vget(*vpp, LK_EXCLUSIVE, td);
|
|
free(lp, M_LOMACFS);
|
|
if (error) {
|
|
*vpp = NULL;
|
|
return (error);
|
|
} else
|
|
return (EEXIST);
|
|
}
|
|
}
|
|
error = getnewvnode(VT_NULL, mp, lomacfs_vnodeop_p, vpp);
|
|
if (error) {
|
|
vput(lowervp);
|
|
free(lp, M_LOMACFS);
|
|
return (error);
|
|
}
|
|
vp = *vpp;
|
|
|
|
vp->v_type = lowervp != NULL ? lowervp->v_type : VBAD;
|
|
if (vp->v_type == VCHR)
|
|
vp->v_rdev = lowervp->v_rdev;
|
|
vp->v_data = lp;
|
|
lp->ln_vp = vp;
|
|
lp->ln_lowervp = lowervp;
|
|
if (lowervp != NULL)
|
|
vhold(lowervp);
|
|
get_subject_lattr(curthread->td_proc, &subjlattr);
|
|
lp->ln_flags = 0;
|
|
lomac_plm_init_lomacfs_vnode(dvp, vp, cnp, &subjlattr);
|
|
/* retrieve the just-initialized attributes */
|
|
lobj.lo_type = LO_TYPE_LVNODE;
|
|
lobj.lo_object.vnode = vp;
|
|
get_object_lattr(&lobj, &objlattr);
|
|
/* propogate the lattr to the underlying vnode */
|
|
lobj.lo_type = LO_TYPE_UVNODE;
|
|
lobj.lo_object.vnode = lowervp;
|
|
set_object_lattr(&lobj, objlattr);
|
|
#if defined(LOMAC_DEBUG_INCNAME)
|
|
if (cnp == NULL)
|
|
strncpy(lp->ln_name, "/", sizeof(lp->ln_name));
|
|
else {
|
|
strncpy(lp->ln_name, cnp->cn_nameptr, cnp->cn_namelen);
|
|
lp->ln_name[cnp->cn_namelen] = '\0';
|
|
}
|
|
#endif
|
|
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_THISLAYER, td);
|
|
if (error)
|
|
panic("lomacfs_node_alloc: can't lock new vnode\n");
|
|
if (cnp == NULL)
|
|
vp->v_flag |= VROOT;
|
|
else if (cnp->cn_flags & MAKEENTRY)
|
|
cache_enter(dvp, vp, cnp);
|
|
|
|
#if defined(LOMAC_DEBUG_NODE_ALLOC)
|
|
printf("lomacfs: made vp %p for lvp %p \"%.*s\" in dvp %p from %s\n",
|
|
vp, lowervp, cnp ? (int)cnp->cn_namelen : 0,
|
|
cnp ? cnp->cn_nameptr : "", dvp,
|
|
lowervp != NULL ? lowervp->v_mount->mnt_stat.f_mntonname : "");
|
|
#endif
|
|
|
|
return (0);
|
|
}
|