NetBSD-5.0.2/sys/dev/bio.c
/* $NetBSD: bio.c,v 1.8 2008/04/09 05:47:19 cegger Exp $ */
/* $OpenBSD: bio.c,v 1.9 2007/03/20 02:35:55 marco Exp $ */
/*
* Copyright (c) 2002 Niklas Hallqvist. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/* A device controller ioctl tunnelling device. */
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bio.c,v 1.8 2008/04/09 05:47:19 cegger Exp $");
#include "opt_compat_netbsd.h"
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/event.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <dev/biovar.h>
struct bio_mapping {
LIST_ENTRY(bio_mapping) bm_link;
struct device *bm_dev;
int (*bm_ioctl)(struct device *, u_long, void *);
};
static LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios);
static kmutex_t bio_lock;
static bool bio_lock_initialized = false;
static void bio_initialize(void);
static int bioclose(dev_t, int, int, struct lwp *);
static int bioioctl(dev_t, u_long, void *, int, struct lwp *);
static int bioopen(dev_t, int, int, struct lwp *);
static int bio_delegate_ioctl(void *, u_long, void *);
static struct bio_mapping *bio_lookup(char *);
static int bio_validate(void *);
void bioattach(int);
const struct cdevsw bio_cdevsw = {
bioopen, bioclose, noread, nowrite, bioioctl,
nostop, notty, nopoll, nommap, nokqfilter, D_OTHER | D_MPSAFE
};
static void
bio_initialize(void)
{
if (bio_lock_initialized)
return;
mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM);
bio_lock_initialized = true;
}
void
bioattach(int nunits)
{
if (!bio_lock_initialized)
bio_initialize();
}
static int
bioopen(dev_t dev, int flags, int mode, struct lwp *l)
{
return 0;
}
static int
bioclose(dev_t dev, int flags, int mode, struct lwp *l)
{
return 0;
}
static int
bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
{
struct bio_locate *locate;
struct bio_common *common;
char name[16];
int error;
switch(cmd) {
case BIOCLOCATE:
case BIOCINQ:
case BIOCDISK:
case BIOCDISK_NOVOL:
case BIOCVOL:
#ifdef COMPAT_30
case OBIOCDISK:
case OBIOCVOL:
#endif
error = kauth_authorize_device_passthru(l->l_cred, dev,
KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr);
if (error)
return error;
break;
case BIOCBLINK:
case BIOCSETSTATE:
case BIOCVOLOPS:
error = kauth_authorize_device_passthru(l->l_cred, dev,
KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr);
if (error)
return error;
break;
case BIOCALARM: {
struct bioc_alarm *alarm = (struct bioc_alarm *)addr;
switch (alarm->ba_opcode) {
case BIOC_SADISABLE:
case BIOC_SAENABLE:
case BIOC_SASILENCE:
case BIOC_SATEST:
error = kauth_authorize_device_passthru(l->l_cred, dev,
KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr);
if (error)
return error;
break;
case BIOC_GASTATUS:
error = kauth_authorize_device_passthru(l->l_cred, dev,
KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr);
if (error)
return error;
break;
default:
return EINVAL;
}
break;
}
default:
return ENOTTY;
}
switch (cmd) {
case BIOCLOCATE:
locate = addr;
error = copyinstr(locate->bl_name, name, sizeof(name), NULL);
if (error != 0)
return error;
locate->bl_cookie = bio_lookup(name);
if (locate->bl_cookie == NULL)
return ENOENT;
break;
default:
common = addr;
mutex_enter(&bio_lock);
if (!bio_validate(common->bc_cookie)) {
mutex_exit(&bio_lock);
return ENOENT;
}
mutex_exit(&bio_lock);
#ifdef COMPAT_30
switch (cmd) {
case OBIOCDISK: {
struct bioc_disk *bd =
malloc(sizeof(*bd), M_DEVBUF, M_WAITOK|M_ZERO);
(void)memcpy(bd, addr, sizeof(struct obioc_disk));
error = bio_delegate_ioctl(common->bc_cookie,
BIOCDISK, bd);
if (error) {
free(bd, M_DEVBUF);
return error;
}
(void)memcpy(addr, bd, sizeof(struct obioc_disk));
free(bd, M_DEVBUF);
return 0;
}
case OBIOCVOL: {
struct bioc_vol *bv =
malloc(sizeof(*bv), M_DEVBUF, M_WAITOK|M_ZERO);
(void)memcpy(bv, addr, sizeof(struct obioc_vol));
error = bio_delegate_ioctl(common->bc_cookie,
BIOCVOL, bv);
if (error) {
free(bv, M_DEVBUF);
return error;
}
(void)memcpy(addr, bv, sizeof(struct obioc_vol));
free(bv, M_DEVBUF);
return 0;
}
}
#endif
error = bio_delegate_ioctl(common->bc_cookie, cmd, addr);
return error;
}
return 0;
}
int
bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, void *))
{
struct bio_mapping *bm;
if (!bio_lock_initialized)
bio_initialize();
bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO);
if (bm == NULL)
return ENOMEM;
bm->bm_dev = dev;
bm->bm_ioctl = ioctl;
mutex_enter(&bio_lock);
LIST_INSERT_HEAD(&bios, bm, bm_link);
mutex_exit(&bio_lock);
return 0;
}
void
bio_unregister(struct device *dev)
{
struct bio_mapping *bm, *next;
mutex_enter(&bio_lock);
for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) {
next = LIST_NEXT(bm, bm_link);
if (dev == bm->bm_dev) {
LIST_REMOVE(bm, bm_link);
free(bm, M_DEVBUF);
}
}
mutex_exit(&bio_lock);
}
static struct bio_mapping *
bio_lookup(char *name)
{
struct bio_mapping *bm;
mutex_enter(&bio_lock);
LIST_FOREACH(bm, &bios, bm_link) {
if (strcmp(name, device_xname(bm->bm_dev)) == 0) {
mutex_exit(&bio_lock);
return bm;
}
}
mutex_exit(&bio_lock);
return NULL;
}
static int
bio_validate(void *cookie)
{
struct bio_mapping *bm;
LIST_FOREACH(bm, &bios, bm_link)
if (bm == cookie)
return 1;
return 0;
}
static int
bio_delegate_ioctl(void *cookie, u_long cmd, void *addr)
{
struct bio_mapping *bm = cookie;
return bm->bm_ioctl(bm->bm_dev, cmd, addr);
}