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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* vnode ops for the /dev/ipnet directory
* The lookup is based on the ipnetif nodes held
* in the ipnet module. We also override readdir
* in order to delete ipnet nodes no longer in use.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysmacros.h>
#include <sys/sunndi.h>
#include <fs/fs_subr.h>
#include <sys/fs/dv_node.h>
#include <sys/fs/sdev_impl.h>
#include <sys/policy.h>
#include <inet/ipnet.h>
#include <sys/zone.h>
struct vnodeops *devipnet_vnodeops;
static void
devipnet_fill_vattr(struct vattr *vap, dev_t dev)
{
timestruc_t now;
*vap = sdev_vattr_chr;
vap->va_rdev = dev;
vap->va_mode |= 0666;
gethrestime(&now);
vap->va_atime = now;
vap->va_mtime = now;
vap->va_ctime = now;
}
/*
* Check if an ipnet sdev_node is still valid.
*/
int
devipnet_validate(struct sdev_node *dv)
{
dev_t dev;
dev = ipnet_if_getdev(dv->sdev_name, getzoneid());
if (dev == (dev_t)-1)
return (SDEV_VTOR_INVALID);
if (getminor(SDEVTOV(dv)->v_rdev) != getminor(dev))
return (SDEV_VTOR_STALE);
return (SDEV_VTOR_VALID);
}
/*
* This callback is invoked from devname_lookup_func() to create
* an ipnet entry when the node is not found in the cache.
*/
/*ARGSUSED*/
static int
devipnet_create_rvp(struct sdev_node *ddv, char *nm,
void **arg, cred_t *cred, void *whatever, char *whichever)
{
dev_t dev;
struct vattr *vap = (struct vattr *)arg;
int err = 0;
if ((dev = ipnet_if_getdev(nm, getzoneid())) == (dev_t)-1)
err = ENOENT;
else
devipnet_fill_vattr(vap, dev);
return (err);
}
/*
* Lookup for /dev/ipnet directory
* If the entry does not exist, the devipnet_create_rvp() callback
* is invoked to create it. Nodes do not persist across reboot.
*/
/*ARGSUSED3*/
static int
devipnet_lookup(struct vnode *dvp, char *nm, struct vnode **vpp,
struct pathname *pnp, int flags, struct vnode *rdir, struct cred *cred,
caller_context_t *ct, int *direntflags, pathname_t *realpnp)
{
struct sdev_node *sdvp = VTOSDEV(dvp);
struct sdev_node *dv;
struct vnode *rvp = NULL;
int error;
error = devname_lookup_func(sdvp, nm, vpp, cred, devipnet_create_rvp,
SDEV_VATTR);
if (error == 0) {
switch ((*vpp)->v_type) {
case VCHR:
dv = VTOSDEV(VTOS(*vpp)->s_realvp);
ASSERT(VOP_REALVP(SDEVTOV(dv), &rvp, NULL) == ENOSYS);
break;
case VDIR:
dv = VTOSDEV(*vpp);
break;
default:
cmn_err(CE_PANIC, "devipnet_lookup: Unsupported node "
"type: %p: %d", (void *)(*vpp), (*vpp)->v_type);
break;
}
ASSERT(SDEV_HELD(dv));
}
return (error);
}
static void
devipnet_filldir_entry(const char *name, void *arg, dev_t dev)
{
struct sdev_node *ddv = arg;
struct vattr vattr;
struct sdev_node *dv;
ASSERT(RW_WRITE_HELD(&ddv->sdev_contents));
if ((dv = sdev_cache_lookup(ddv, (char *)name)) == NULL) {
devipnet_fill_vattr(&vattr, dev);
if (sdev_mknode(ddv, (char *)name, &dv, &vattr, NULL, NULL,
kcred, SDEV_READY) != 0)
return;
}
SDEV_SIMPLE_RELE(dv);
}
static void
devipnet_filldir(struct sdev_node *ddv)
{
sdev_node_t *dv, *next;
ASSERT(RW_READ_HELD(&ddv->sdev_contents));
if (rw_tryupgrade(&ddv->sdev_contents) == NULL) {
rw_exit(&ddv->sdev_contents);
rw_enter(&ddv->sdev_contents, RW_WRITER);
}
for (dv = SDEV_FIRST_ENTRY(ddv); dv; dv = next) {
next = SDEV_NEXT_ENTRY(ddv, dv);
/* validate and prune only ready nodes */
if (dv->sdev_state != SDEV_READY)
continue;
switch (devipnet_validate(dv)) {
case SDEV_VTOR_VALID:
case SDEV_VTOR_SKIP:
continue;
case SDEV_VTOR_INVALID:
case SDEV_VTOR_STALE:
sdcmn_err12(("devipnet_filldir: destroy invalid "
"node: %s(%p)\n", dv->sdev_name, (void *)dv));
break;
}
if (SDEVTOV(dv)->v_count > 0)
continue;
SDEV_HOLD(dv);
/* remove the cache node */
(void) sdev_cache_update(ddv, &dv, dv->sdev_name,
SDEV_CACHE_DELETE);
}
ipnet_walk_if(devipnet_filldir_entry, ddv, getzoneid());
rw_downgrade(&ddv->sdev_contents);
}
/*
* Display all instantiated ipnet device nodes.
*/
/* ARGSUSED */
static int
devipnet_readdir(struct vnode *dvp, struct uio *uiop, struct cred *cred,
int *eofp, caller_context_t *ct, int flags)
{
struct sdev_node *sdvp = VTOSDEV(dvp);
if (uiop->uio_offset == 0)
devipnet_filldir(sdvp);
return (devname_readdir_func(dvp, uiop, cred, eofp, 0));
}
/*
* We override lookup and readdir to build entries based on the
* in kernel ipnet table.
*/
const fs_operation_def_t devipnet_vnodeops_tbl[] = {
VOPNAME_READDIR, { .vop_readdir = devipnet_readdir },
VOPNAME_LOOKUP, { .vop_lookup = devipnet_lookup },
VOPNAME_CREATE, { .error = fs_nosys },
VOPNAME_REMOVE, { .error = fs_nosys },
VOPNAME_MKDIR, { .error = fs_nosys },
VOPNAME_RMDIR, { .error = fs_nosys },
VOPNAME_SYMLINK, { .error = fs_nosys },
VOPNAME_SETSECATTR, { .error = fs_nosys },
NULL, NULL
};
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