128 lines
4.2 KiB
C
128 lines
4.2 KiB
C
/*-
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* Copyright (c) 2001 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by NAI Labs, the
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* Security Research Division of Network Associates, Inc. under
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* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
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* CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include "lomacfs.h"
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#include "kernel_plm.h"
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int
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lomacfs_node_alloc(struct mount *mp, struct componentname *cnp,
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struct vnode *dvp, struct vnode *lowervp, struct vnode **vpp) {
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lomac_object_t lobj;
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struct thread *td = curthread;
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struct vnode *vp;
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struct lomac_node *lp;
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lattr_t subjlattr, objlattr;
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int error;
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KASSERT((cnp == NULL) == (dvp == NULL),
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("lomacfs_node_alloc: dvp and cnp do not match"));
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lp = malloc(sizeof(*lp), M_LOMACFS, M_WAITOK);
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if (dvp != NULL) {
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error = cache_lookup(dvp, vpp, cnp);
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if (error == -1) { /* lost the race; return EEXIST and the vp */
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vput(lowervp);
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error = vget(*vpp, LK_EXCLUSIVE, td);
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free(lp, M_LOMACFS);
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if (error) {
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*vpp = NULL;
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return (error);
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} else
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return (EEXIST);
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}
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}
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error = getnewvnode(VT_NULL, mp, lomacfs_vnodeop_p, vpp);
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if (error) {
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vput(lowervp);
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free(lp, M_LOMACFS);
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return (error);
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}
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vp = *vpp;
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vp->v_type = lowervp != NULL ? lowervp->v_type : VBAD;
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if (vp->v_type == VCHR)
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vp->v_rdev = lowervp->v_rdev;
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vp->v_data = lp;
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lp->ln_vp = vp;
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lp->ln_lowervp = lowervp;
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if (lowervp != NULL)
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vhold(lowervp);
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get_subject_lattr(curthread->td_proc, &subjlattr);
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lp->ln_flags = 0;
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lomac_plm_init_lomacfs_vnode(dvp, vp, cnp, &subjlattr);
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/* retrieve the just-initialized attributes */
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lobj.lo_type = LO_TYPE_LVNODE;
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lobj.lo_object.vnode = vp;
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get_object_lattr(&lobj, &objlattr);
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/* propogate the lattr to the underlying vnode */
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lobj.lo_type = LO_TYPE_UVNODE;
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lobj.lo_object.vnode = lowervp;
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set_object_lattr(&lobj, objlattr);
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#if defined(LOMAC_DEBUG_INCNAME)
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if (cnp == NULL)
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strncpy(lp->ln_name, "/", sizeof(lp->ln_name));
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else {
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strncpy(lp->ln_name, cnp->cn_nameptr, cnp->cn_namelen);
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lp->ln_name[cnp->cn_namelen] = '\0';
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}
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#endif
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error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_THISLAYER, td);
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if (error)
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panic("lomacfs_node_alloc: can't lock new vnode\n");
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if (cnp == NULL)
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vp->v_flag |= VROOT;
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else if (cnp->cn_flags & MAKEENTRY)
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cache_enter(dvp, vp, cnp);
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#if defined(LOMAC_DEBUG_NODE_ALLOC)
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printf("lomacfs: made vp %p for lvp %p \"%.*s\" in dvp %p from %s\n",
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vp, lowervp, cnp ? (int)cnp->cn_namelen : 0,
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cnp ? cnp->cn_nameptr : "", dvp,
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lowervp != NULL ? lowervp->v_mount->mnt_stat.f_mntonname : "");
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#endif
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return (0);
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}
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