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freebsd/sys/netsmb/smb_dev.c
Davide Italiano a4c059845a Overhaul locking in netsmb, getting rid of the obsolete lockmgr() primitive. 
This solves a long standing LOR between smb_conn and smb_vc.

Tested by:	martymac, pho (previous version)
2013-05-04 14:18:10 +00:00

414 lines
9.2 KiB
C
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/*-
* Copyright (c) 2000-2001 Boris Popov
* 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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/capability.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/ioccom.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/file.h> /* Must come after sys/malloc.h */
#include <sys/filedesc.h>
#include <sys/mbuf.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <net/if.h>
#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_subr.h>
#include <netsmb/smb_dev.h>
static struct cdev *nsmb_dev;
static d_open_t nsmb_dev_open;
static d_ioctl_t nsmb_dev_ioctl;
MODULE_DEPEND(netsmb, libiconv, 1, 1, 2);
MODULE_VERSION(netsmb, NSMB_VERSION);
static int smb_version = NSMB_VERSION;
struct sx smb_lock;
SYSCTL_DECL(_net_smb);
SYSCTL_INT(_net_smb, OID_AUTO, version, CTLFLAG_RD, &smb_version, 0, "");
static MALLOC_DEFINE(M_NSMBDEV, "NETSMBDEV", "NET/SMB device");
static struct cdevsw nsmb_cdevsw = {
.d_version = D_VERSION,
.d_open = nsmb_dev_open,
.d_ioctl = nsmb_dev_ioctl,
.d_name = NSMB_NAME
};
static int
nsmb_dev_init(void)
{
nsmb_dev = make_dev(&nsmb_cdevsw, 0, UID_ROOT, GID_OPERATOR,
0600, "nsmb");
if (nsmb_dev == NULL)
return (ENOMEM);
return (0);
}
static void
nsmb_dev_destroy(void)
{
MPASS(nsmb_dev != NULL);
destroy_dev(nsmb_dev);
nsmb_dev = NULL;
}
static struct smb_dev *
smbdev_alloc(struct cdev *dev)
{
struct smb_dev *sdp;
sdp = malloc(sizeof(struct smb_dev), M_NSMBDEV, M_WAITOK | M_ZERO);
sdp->dev = dev;
sdp->sd_level = -1;
sdp->sd_flags |= NSMBFL_OPEN;
sdp->refcount = 1;
return (sdp);
}
void
sdp_dtor(void *arg)
{
struct smb_dev *dev;
dev = (struct smb_dev *)arg;
SMB_LOCK();
sdp_trydestroy(dev);
SMB_UNLOCK();
}
static int
nsmb_dev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct smb_dev *sdp;
int error;
sdp = smbdev_alloc(dev);
error = devfs_set_cdevpriv(sdp, sdp_dtor);
if (error) {
free(sdp, M_NSMBDEV);
return (error);
}
return (0);
}
void
sdp_trydestroy(struct smb_dev *sdp)
{
struct smb_vc *vcp;
struct smb_share *ssp;
struct smb_cred *scred;
SMB_LOCKASSERT();
if (!sdp)
panic("No smb_dev upon device close");
MPASS(sdp->refcount > 0);
sdp->refcount--;
if (sdp->refcount)
return;
scred = malloc(sizeof(struct smb_cred), M_NSMBDEV, M_WAITOK);
smb_makescred(scred, curthread, NULL);
ssp = sdp->sd_share;
if (ssp != NULL) {
smb_share_lock(ssp);
smb_share_rele(ssp, scred);
}
vcp = sdp->sd_vc;
if (vcp != NULL) {
smb_vc_lock(vcp);
smb_vc_rele(vcp, scred);
}
free(scred, M_NSMBDEV);
free(sdp, M_NSMBDEV);
return;
}
static int
nsmb_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
struct smb_dev *sdp;
struct smb_vc *vcp;
struct smb_share *ssp;
struct smb_cred *scred;
int error = 0;
error = devfs_get_cdevpriv((void **)&sdp);
if (error)
return (error);
scred = malloc(sizeof(struct smb_cred), M_NSMBDEV, M_WAITOK);
SMB_LOCK();
smb_makescred(scred, td, NULL);
switch (cmd) {
case SMBIOC_OPENSESSION:
if (sdp->sd_vc) {
error = EISCONN;
goto out;
}
error = smb_usr_opensession((struct smbioc_ossn*)data,
scred, &vcp);
if (error)
break;
sdp->sd_vc = vcp;
smb_vc_unlock(vcp);
sdp->sd_level = SMBL_VC;
break;
case SMBIOC_OPENSHARE:
if (sdp->sd_share) {
error = EISCONN;
goto out;
}
if (sdp->sd_vc == NULL) {
error = ENOTCONN;
goto out;
}
error = smb_usr_openshare(sdp->sd_vc,
(struct smbioc_oshare*)data, scred, &ssp);
if (error)
break;
sdp->sd_share = ssp;
smb_share_unlock(ssp);
sdp->sd_level = SMBL_SHARE;
break;
case SMBIOC_REQUEST:
if (sdp->sd_share == NULL) {
error = ENOTCONN;
goto out;
}
error = smb_usr_simplerequest(sdp->sd_share,
(struct smbioc_rq*)data, scred);
break;
case SMBIOC_T2RQ:
if (sdp->sd_share == NULL) {
error = ENOTCONN;
goto out;
}
error = smb_usr_t2request(sdp->sd_share,
(struct smbioc_t2rq*)data, scred);
break;
case SMBIOC_SETFLAGS: {
struct smbioc_flags *fl = (struct smbioc_flags*)data;
int on;
if (fl->ioc_level == SMBL_VC) {
if (fl->ioc_mask & SMBV_PERMANENT) {
on = fl->ioc_flags & SMBV_PERMANENT;
if ((vcp = sdp->sd_vc) == NULL) {
error = ENOTCONN;
goto out;
}
error = smb_vc_get(vcp, scred);
if (error)
break;
if (on && (vcp->obj.co_flags & SMBV_PERMANENT) == 0) {
vcp->obj.co_flags |= SMBV_PERMANENT;
smb_vc_ref(vcp);
} else if (!on && (vcp->obj.co_flags & SMBV_PERMANENT)) {
vcp->obj.co_flags &= ~SMBV_PERMANENT;
smb_vc_rele(vcp, scred);
}
smb_vc_put(vcp, scred);
} else
error = EINVAL;
} else if (fl->ioc_level == SMBL_SHARE) {
if (fl->ioc_mask & SMBS_PERMANENT) {
on = fl->ioc_flags & SMBS_PERMANENT;
if ((ssp = sdp->sd_share) == NULL) {
error = ENOTCONN;
goto out;
}
error = smb_share_get(ssp, scred);
if (error)
break;
if (on && (ssp->obj.co_flags & SMBS_PERMANENT) == 0) {
ssp->obj.co_flags |= SMBS_PERMANENT;
smb_share_ref(ssp);
} else if (!on && (ssp->obj.co_flags & SMBS_PERMANENT)) {
ssp->obj.co_flags &= ~SMBS_PERMANENT;
smb_share_rele(ssp, scred);
}
smb_share_put(ssp, scred);
} else
error = EINVAL;
break;
} else
error = EINVAL;
break;
}
case SMBIOC_LOOKUP:
if (sdp->sd_vc || sdp->sd_share) {
error = EISCONN;
goto out;
}
vcp = NULL;
ssp = NULL;
error = smb_usr_lookup((struct smbioc_lookup*)data, scred, &vcp, &ssp);
if (error)
break;
if (vcp) {
sdp->sd_vc = vcp;
smb_vc_unlock(vcp);
sdp->sd_level = SMBL_VC;
}
if (ssp) {
sdp->sd_share = ssp;
smb_share_unlock(ssp);
sdp->sd_level = SMBL_SHARE;
}
break;
case SMBIOC_READ: case SMBIOC_WRITE: {
struct smbioc_rw *rwrq = (struct smbioc_rw*)data;
struct uio auio;
struct iovec iov;
if ((ssp = sdp->sd_share) == NULL) {
error = ENOTCONN;
goto out;
}
iov.iov_base = rwrq->ioc_base;
iov.iov_len = rwrq->ioc_cnt;
auio.uio_iov = &iov;
auio.uio_iovcnt = 1;
auio.uio_offset = rwrq->ioc_offset;
auio.uio_resid = rwrq->ioc_cnt;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = (cmd == SMBIOC_READ) ? UIO_READ : UIO_WRITE;
auio.uio_td = td;
if (cmd == SMBIOC_READ)
error = smb_read(ssp, rwrq->ioc_fh, &auio, scred);
else
error = smb_write(ssp, rwrq->ioc_fh, &auio, scred);
rwrq->ioc_cnt -= auio.uio_resid;
break;
}
default:
error = ENODEV;
}
out:
free(scred, M_NSMBDEV);
SMB_UNLOCK();
return error;
}
static int
nsmb_dev_load(module_t mod, int cmd, void *arg)
{
int error = 0;
switch (cmd) {
case MOD_LOAD:
error = smb_sm_init();
if (error)
break;
error = smb_iod_init();
if (error) {
smb_sm_done();
break;
}
error = nsmb_dev_init();
if (error)
break;
sx_init(&smb_lock, "samba device lock");
break;
case MOD_UNLOAD:
smb_iod_done();
error = smb_sm_done();
if (error)
break;
nsmb_dev_destroy();
sx_destroy(&smb_lock);
break;
default:
error = EINVAL;
break;
}
return error;
}
DEV_MODULE (dev_netsmb, nsmb_dev_load, 0);
int
smb_dev2share(int fd, int mode, struct smb_cred *scred,
struct smb_share **sspp, struct smb_dev **ssdp)
{
struct file *fp, *fptmp;
struct smb_dev *sdp;
struct smb_share *ssp;
struct thread *td;
int error;
td = curthread;
error = fget(td, fd, CAP_READ, &fp);
if (error)
return (error);
fptmp = td->td_fpop;
td->td_fpop = fp;
error = devfs_get_cdevpriv((void **)&sdp);
td->td_fpop = fptmp;
fdrop(fp, td);
if (error || sdp == NULL)
return (error);
SMB_LOCK();
*ssdp = sdp;
ssp = sdp->sd_share;
if (ssp == NULL) {
SMB_UNLOCK();
return (ENOTCONN);
}
error = smb_share_get(ssp, scred);
if (error == 0) {
sdp->refcount++;
*sspp = ssp;
}
SMB_UNLOCK();
return error;
}
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