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freebsd-skq/sys/netsmb/smb_iod.c
tjr 622d036645 Add support for SMB request signing, which prevents "man in the middle" 
attacks and is required to connect to Windows 2003 servers in their
default configuration. This adds an extra field to the SMB header
containing the truncated 64-bit MD5 digest of a key (a function of the
user's password and the server's authentication challenge), an implicit
sequence number, and the message data itself. As signing each message
imposes a significant performance penalty, we only enable it if the
server will not let us connect without it; this should eventually become
an option to mount_smbfs.
2004-01-02 22:38:42 +00:00

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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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/unistd.h>
#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_rq.h>
#include <netsmb/smb_tran.h>
#include <netsmb/smb_trantcp.h>
#define SMBIOD_SLEEP_TIMO 2
#define SMBIOD_PING_TIMO 60 /* seconds */
#define SMB_IOD_EVLOCKPTR(iod) (&((iod)->iod_evlock))
#define SMB_IOD_EVLOCK(iod) smb_sl_lock(&((iod)->iod_evlock))
#define SMB_IOD_EVUNLOCK(iod) smb_sl_unlock(&((iod)->iod_evlock))
#define SMB_IOD_RQLOCKPTR(iod) (&((iod)->iod_rqlock))
#define SMB_IOD_RQLOCK(iod) smb_sl_lock(&((iod)->iod_rqlock))
#define SMB_IOD_RQUNLOCK(iod) smb_sl_unlock(&((iod)->iod_rqlock))
#define smb_iod_wakeup(iod) wakeup(&(iod)->iod_flags)
static MALLOC_DEFINE(M_SMBIOD, "SMBIOD", "SMB network io daemon");
static int smb_iod_next;
static int smb_iod_sendall(struct smbiod *iod);
static int smb_iod_disconnect(struct smbiod *iod);
static void smb_iod_thread(void *);
static __inline void
smb_iod_rqprocessed(struct smb_rq *rqp, int error)
{
SMBRQ_SLOCK(rqp);
rqp->sr_lerror = error;
rqp->sr_rpgen++;
rqp->sr_state = SMBRQ_NOTIFIED;
wakeup(&rqp->sr_state);
SMBRQ_SUNLOCK(rqp);
}
static void
smb_iod_invrq(struct smbiod *iod)
{
struct smb_rq *rqp;
/*
* Invalidate all outstanding requests for this connection
*/
SMB_IOD_RQLOCK(iod);
TAILQ_FOREACH(rqp, &iod->iod_rqlist, sr_link) {
if (rqp->sr_flags & SMBR_INTERNAL)
SMBRQ_SUNLOCK(rqp);
rqp->sr_flags |= SMBR_RESTART;
smb_iod_rqprocessed(rqp, ENOTCONN);
}
SMB_IOD_RQUNLOCK(iod);
}
static void
smb_iod_closetran(struct smbiod *iod)
{
struct smb_vc *vcp = iod->iod_vc;
struct thread *td = iod->iod_td;
if (vcp->vc_tdata == NULL)
return;
SMB_TRAN_DISCONNECT(vcp, td);
SMB_TRAN_DONE(vcp, td);
vcp->vc_tdata = NULL;
}
static void
smb_iod_dead(struct smbiod *iod)
{
iod->iod_state = SMBIOD_ST_DEAD;
smb_iod_closetran(iod);
smb_iod_invrq(iod);
}
static int
smb_iod_connect(struct smbiod *iod)
{
struct smb_vc *vcp = iod->iod_vc;
struct thread *td = iod->iod_td;
int error;
SMBIODEBUG("%d\n", iod->iod_state);
switch(iod->iod_state) {
case SMBIOD_ST_VCACTIVE:
SMBERROR("called for already opened connection\n");
return EISCONN;
case SMBIOD_ST_DEAD:
return ENOTCONN; /* XXX: last error code ? */
default:
break;
}
vcp->vc_genid++;
error = 0;
error = (int)SMB_TRAN_CREATE(vcp, td);
if (error)
goto fail;
SMBIODEBUG("tcreate\n");
if (vcp->vc_laddr) {
error = (int)SMB_TRAN_BIND(vcp, vcp->vc_laddr, td);
if (error)
goto fail;
}
SMBIODEBUG("tbind\n");
error = (int)SMB_TRAN_CONNECT(vcp, vcp->vc_paddr, td);
if (error)
goto fail;
SMB_TRAN_SETPARAM(vcp, SMBTP_SELECTID, &iod->iod_flags);
iod->iod_state = SMBIOD_ST_TRANACTIVE;
SMBIODEBUG("tconnect\n");
/* vcp->vc_mid = 0;*/
error = (int)smb_smb_negotiate(vcp, &iod->iod_scred);
if (error)
goto fail;
SMBIODEBUG("snegotiate\n");
error = (int)smb_smb_ssnsetup(vcp, &iod->iod_scred);
if (error)
goto fail;
iod->iod_state = SMBIOD_ST_VCACTIVE;
SMBIODEBUG("completed\n");
smb_iod_invrq(iod);
return (0);
fail:
smb_iod_dead(iod);
return (error);
}
static int
smb_iod_disconnect(struct smbiod *iod)
{
struct smb_vc *vcp = iod->iod_vc;
SMBIODEBUG("\n");
if (iod->iod_state == SMBIOD_ST_VCACTIVE) {
smb_smb_ssnclose(vcp, &iod->iod_scred);
iod->iod_state = SMBIOD_ST_TRANACTIVE;
}
vcp->vc_smbuid = SMB_UID_UNKNOWN;
smb_iod_closetran(iod);
iod->iod_state = SMBIOD_ST_NOTCONN;
return 0;
}
static int
smb_iod_treeconnect(struct smbiod *iod, struct smb_share *ssp)
{
int error;
if (iod->iod_state != SMBIOD_ST_VCACTIVE) {
if (iod->iod_state != SMBIOD_ST_DEAD)
return ENOTCONN;
iod->iod_state = SMBIOD_ST_RECONNECT;
error = smb_iod_connect(iod);
if (error)
return error;
}
SMBIODEBUG("tree reconnect\n");
SMBS_ST_LOCK(ssp);
ssp->ss_flags |= SMBS_RECONNECTING;
SMBS_ST_UNLOCK(ssp);
error = smb_smb_treeconnect(ssp, &iod->iod_scred);
SMBS_ST_LOCK(ssp);
ssp->ss_flags &= ~SMBS_RECONNECTING;
SMBS_ST_UNLOCK(ssp);
wakeup(&ssp->ss_vcgenid);
return error;
}
static int
smb_iod_sendrq(struct smbiod *iod, struct smb_rq *rqp)
{
struct thread *td = iod->iod_td;
struct smb_vc *vcp = iod->iod_vc;
struct smb_share *ssp = rqp->sr_share;
struct mbuf *m;
int error;
SMBIODEBUG("iod_state = %d\n", iod->iod_state);
switch (iod->iod_state) {
case SMBIOD_ST_NOTCONN:
smb_iod_rqprocessed(rqp, ENOTCONN);
return 0;
case SMBIOD_ST_DEAD:
iod->iod_state = SMBIOD_ST_RECONNECT;
return 0;
case SMBIOD_ST_RECONNECT:
return 0;
default:
break;
}
if (rqp->sr_sendcnt == 0) {
#ifdef movedtoanotherplace
if (vcp->vc_maxmux != 0 && iod->iod_muxcnt >= vcp->vc_maxmux)
return 0;
#endif
*rqp->sr_rqtid = htole16(ssp ? ssp->ss_tid : SMB_TID_UNKNOWN);
*rqp->sr_rquid = htole16(vcp ? vcp->vc_smbuid : 0);
mb_fixhdr(&rqp->sr_rq);
if (vcp->vc_hflags2 & SMB_FLAGS2_SECURITY_SIGNATURE)
smb_rq_sign(rqp);
}
if (rqp->sr_sendcnt++ > 5) {
rqp->sr_flags |= SMBR_RESTART;
smb_iod_rqprocessed(rqp, rqp->sr_lerror);
/*
* If all attempts to send a request failed, then
* something is seriously hosed.
*/
return ENOTCONN;
}
SMBSDEBUG("M:%04x, P:%04x, U:%04x, T:%04x\n", rqp->sr_mid, 0, 0, 0);
m_dumpm(rqp->sr_rq.mb_top);
m = m_copym(rqp->sr_rq.mb_top, 0, M_COPYALL, M_TRYWAIT);
error = rqp->sr_lerror = m ? SMB_TRAN_SEND(vcp, m, td) : ENOBUFS;
if (error == 0) {
getnanotime(&rqp->sr_timesent);
iod->iod_lastrqsent = rqp->sr_timesent;
rqp->sr_flags |= SMBR_SENT;
rqp->sr_state = SMBRQ_SENT;
return 0;
}
/*
* Check for fatal errors
*/
if (SMB_TRAN_FATAL(vcp, error)) {
/*
* No further attempts should be made
*/
return ENOTCONN;
}
if (smb_rq_intr(rqp))
smb_iod_rqprocessed(rqp, EINTR);
return 0;
}
/*
* Process incoming packets
*/
static int
smb_iod_recvall(struct smbiod *iod)
{
struct smb_vc *vcp = iod->iod_vc;
struct thread *td = iod->iod_td;
struct smb_rq *rqp;
struct mbuf *m;
u_char *hp;
u_short mid;
int error;
switch (iod->iod_state) {
case SMBIOD_ST_NOTCONN:
case SMBIOD_ST_DEAD:
case SMBIOD_ST_RECONNECT:
return 0;
default:
break;
}
for (;;) {
m = NULL;
error = SMB_TRAN_RECV(vcp, &m, td);
if (error == EWOULDBLOCK)
break;
if (SMB_TRAN_FATAL(vcp, error)) {
smb_iod_dead(iod);
break;
}
if (error)
break;
if (m == NULL) {
SMBERROR("tran return NULL without error\n");
error = EPIPE;
continue;
}
m = m_pullup(m, SMB_HDRLEN);
if (m == NULL)
continue; /* wait for a good packet */
/*
* Now we got an entire and possibly invalid SMB packet.
* Be careful while parsing it.
*/
m_dumpm(m);
hp = mtod(m, u_char*);
if (bcmp(hp, SMB_SIGNATURE, SMB_SIGLEN) != 0) {
m_freem(m);
continue;
}
mid = SMB_HDRMID(hp);
SMBSDEBUG("mid %04x\n", (u_int)mid);
SMB_IOD_RQLOCK(iod);
TAILQ_FOREACH(rqp, &iod->iod_rqlist, sr_link) {
if (rqp->sr_mid != mid)
continue;
SMBRQ_SLOCK(rqp);
if (rqp->sr_rp.md_top == NULL) {
md_initm(&rqp->sr_rp, m);
} else {
if (rqp->sr_flags & SMBR_MULTIPACKET) {
md_append_record(&rqp->sr_rp, m);
} else {
SMBRQ_SUNLOCK(rqp);
SMBERROR("duplicate response %d (ignored)\n", mid);
break;
}
}
SMBRQ_SUNLOCK(rqp);
smb_iod_rqprocessed(rqp, 0);
break;
}
SMB_IOD_RQUNLOCK(iod);
if (rqp == NULL) {
SMBERROR("drop resp with mid %d\n", (u_int)mid);
/* smb_printrqlist(vcp);*/
m_freem(m);
}
}
/*
* check for interrupts
*/
SMB_IOD_RQLOCK(iod);
TAILQ_FOREACH(rqp, &iod->iod_rqlist, sr_link) {
if (smb_td_intr(rqp->sr_cred->scr_td)) {
smb_iod_rqprocessed(rqp, EINTR);
}
}
SMB_IOD_RQUNLOCK(iod);
return 0;
}
int
smb_iod_request(struct smbiod *iod, int event, void *ident)
{
struct smbiod_event *evp;
int error;
SMBIODEBUG("\n");
evp = smb_zmalloc(sizeof(*evp), M_SMBIOD, M_WAITOK);
evp->ev_type = event;
evp->ev_ident = ident;
SMB_IOD_EVLOCK(iod);
STAILQ_INSERT_TAIL(&iod->iod_evlist, evp, ev_link);
if ((event & SMBIOD_EV_SYNC) == 0) {
SMB_IOD_EVUNLOCK(iod);
smb_iod_wakeup(iod);
return 0;
}
smb_iod_wakeup(iod);
msleep(evp, SMB_IOD_EVLOCKPTR(iod), PWAIT | PDROP, "90evw", 0);
error = evp->ev_error;
free(evp, M_SMBIOD);
return error;
}
/*
* Place request in the queue.
* Request from smbiod have a high priority.
*/
int
smb_iod_addrq(struct smb_rq *rqp)
{
struct smb_vc *vcp = rqp->sr_vc;
struct smbiod *iod = vcp->vc_iod;
int error;
SMBIODEBUG("\n");
if (rqp->sr_cred->scr_td != NULL &&
rqp->sr_cred->scr_td->td_proc == iod->iod_p) {
rqp->sr_flags |= SMBR_INTERNAL;
SMB_IOD_RQLOCK(iod);
TAILQ_INSERT_HEAD(&iod->iod_rqlist, rqp, sr_link);
SMB_IOD_RQUNLOCK(iod);
for (;;) {
if (smb_iod_sendrq(iod, rqp) != 0) {
smb_iod_dead(iod);
break;
}
/*
* we don't need to lock state field here
*/
if (rqp->sr_state != SMBRQ_NOTSENT)
break;
tsleep(&iod->iod_flags, PWAIT, "90sndw", hz);
}
if (rqp->sr_lerror)
smb_iod_removerq(rqp);
return rqp->sr_lerror;
}
switch (iod->iod_state) {
case SMBIOD_ST_NOTCONN:
return ENOTCONN;
case SMBIOD_ST_DEAD:
error = smb_iod_request(vcp->vc_iod, SMBIOD_EV_CONNECT | SMBIOD_EV_SYNC, NULL);
if (error)
return error;
return EXDEV;
default:
break;
}
SMB_IOD_RQLOCK(iod);
for (;;) {
if (vcp->vc_maxmux == 0) {
SMBERROR("maxmux == 0\n");
break;
}
if (iod->iod_muxcnt < vcp->vc_maxmux)
break;
iod->iod_muxwant++;
msleep(&iod->iod_muxwant, SMB_IOD_RQLOCKPTR(iod),
PWAIT, "90mux", 0);
}
iod->iod_muxcnt++;
TAILQ_INSERT_TAIL(&iod->iod_rqlist, rqp, sr_link);
SMB_IOD_RQUNLOCK(iod);
smb_iod_wakeup(iod);
return 0;
}
int
smb_iod_removerq(struct smb_rq *rqp)
{
struct smb_vc *vcp = rqp->sr_vc;
struct smbiod *iod = vcp->vc_iod;
SMBIODEBUG("\n");
if (rqp->sr_flags & SMBR_INTERNAL) {
SMB_IOD_RQLOCK(iod);
TAILQ_REMOVE(&iod->iod_rqlist, rqp, sr_link);
SMB_IOD_RQUNLOCK(iod);
return 0;
}
SMB_IOD_RQLOCK(iod);
while (rqp->sr_flags & SMBR_XLOCK) {
rqp->sr_flags |= SMBR_XLOCKWANT;
msleep(rqp, SMB_IOD_RQLOCKPTR(iod), PWAIT, "90xrm", 0);
}
TAILQ_REMOVE(&iod->iod_rqlist, rqp, sr_link);
iod->iod_muxcnt--;
if (iod->iod_muxwant) {
iod->iod_muxwant--;
wakeup(&iod->iod_muxwant);
}
SMB_IOD_RQUNLOCK(iod);
return 0;
}
int
smb_iod_waitrq(struct smb_rq *rqp)
{
struct smbiod *iod = rqp->sr_vc->vc_iod;
int error;
SMBIODEBUG("\n");
if (rqp->sr_flags & SMBR_INTERNAL) {
for (;;) {
smb_iod_sendall(iod);
smb_iod_recvall(iod);
if (rqp->sr_rpgen != rqp->sr_rplast)
break;
tsleep(&iod->iod_flags, PWAIT, "90irq", hz);
}
smb_iod_removerq(rqp);
return rqp->sr_lerror;
}
SMBRQ_SLOCK(rqp);
if (rqp->sr_rpgen == rqp->sr_rplast)
msleep(&rqp->sr_state, SMBRQ_SLOCKPTR(rqp), PWAIT, "90wrq", 0);
rqp->sr_rplast++;
SMBRQ_SUNLOCK(rqp);
error = rqp->sr_lerror;
if (rqp->sr_flags & SMBR_MULTIPACKET) {
/*
* If request should stay in the list, then reinsert it
* at the end of queue so other waiters have chance to concur
*/
SMB_IOD_RQLOCK(iod);
TAILQ_REMOVE(&iod->iod_rqlist, rqp, sr_link);
TAILQ_INSERT_TAIL(&iod->iod_rqlist, rqp, sr_link);
SMB_IOD_RQUNLOCK(iod);
} else
smb_iod_removerq(rqp);
return error;
}
static int
smb_iod_sendall(struct smbiod *iod)
{
struct smb_vc *vcp = iod->iod_vc;
struct smb_rq *rqp;
struct timespec ts, tstimeout;
int herror;
herror = 0;
/*
* Loop through the list of requests and send them if possible
*/
SMB_IOD_RQLOCK(iod);
TAILQ_FOREACH(rqp, &iod->iod_rqlist, sr_link) {
switch (rqp->sr_state) {
case SMBRQ_NOTSENT:
rqp->sr_flags |= SMBR_XLOCK;
SMB_IOD_RQUNLOCK(iod);
herror = smb_iod_sendrq(iod, rqp);
SMB_IOD_RQLOCK(iod);
rqp->sr_flags &= ~SMBR_XLOCK;
if (rqp->sr_flags & SMBR_XLOCKWANT) {
rqp->sr_flags &= ~SMBR_XLOCKWANT;
wakeup(rqp);
}
break;
case SMBRQ_SENT:
SMB_TRAN_GETPARAM(vcp, SMBTP_TIMEOUT, &tstimeout);
timespecadd(&tstimeout, &tstimeout);
getnanotime(&ts);
timespecsub(&ts, &tstimeout);
if (timespeccmp(&ts, &rqp->sr_timesent, >)) {
smb_iod_rqprocessed(rqp, ETIMEDOUT);
}
break;
default:
break;
}
if (herror)
break;
}
SMB_IOD_RQUNLOCK(iod);
if (herror == ENOTCONN)
smb_iod_dead(iod);
return 0;
}
/*
* "main" function for smbiod daemon
*/
static __inline void
smb_iod_main(struct smbiod *iod)
{
/* struct smb_vc *vcp = iod->iod_vc;*/
struct smbiod_event *evp;
/* struct timespec tsnow;*/
int error;
SMBIODEBUG("\n");
error = 0;
/*
* Check all interesting events
*/
for (;;) {
SMB_IOD_EVLOCK(iod);
evp = STAILQ_FIRST(&iod->iod_evlist);
if (evp == NULL) {
SMB_IOD_EVUNLOCK(iod);
break;
}
STAILQ_REMOVE_HEAD(&iod->iod_evlist, ev_link);
evp->ev_type |= SMBIOD_EV_PROCESSING;
SMB_IOD_EVUNLOCK(iod);
switch (evp->ev_type & SMBIOD_EV_MASK) {
case SMBIOD_EV_CONNECT:
iod->iod_state = SMBIOD_ST_RECONNECT;
evp->ev_error = smb_iod_connect(iod);
break;
case SMBIOD_EV_DISCONNECT:
evp->ev_error = smb_iod_disconnect(iod);
break;
case SMBIOD_EV_TREECONNECT:
evp->ev_error = smb_iod_treeconnect(iod, evp->ev_ident);
break;
case SMBIOD_EV_SHUTDOWN:
iod->iod_flags |= SMBIOD_SHUTDOWN;
break;
case SMBIOD_EV_NEWRQ:
break;
}
if (evp->ev_type & SMBIOD_EV_SYNC) {
SMB_IOD_EVLOCK(iod);
wakeup(evp);
SMB_IOD_EVUNLOCK(iod);
} else
free(evp, M_SMBIOD);
}
#if 0
if (iod->iod_state == SMBIOD_ST_VCACTIVE) {
getnanotime(&tsnow);
timespecsub(&tsnow, &iod->iod_pingtimo);
if (timespeccmp(&tsnow, &iod->iod_lastrqsent, >)) {
smb_smb_echo(vcp, &iod->iod_scred);
}
}
#endif
smb_iod_sendall(iod);
smb_iod_recvall(iod);
return;
}
void
smb_iod_thread(void *arg)
{
struct smbiod *iod = arg;
mtx_lock(&Giant);
/*
* Here we assume that the thread structure will be the same
* for an entire kthread (kproc, to be more precise) life.
*/
iod->iod_td = curthread;
smb_makescred(&iod->iod_scred, iod->iod_td, NULL);
while ((iod->iod_flags & SMBIOD_SHUTDOWN) == 0) {
smb_iod_main(iod);
SMBIODEBUG("going to sleep for %d ticks\n", iod->iod_sleeptimo);
/* mtx_unlock(&Giant, MTX_DEF);*/
if (iod->iod_flags & SMBIOD_SHUTDOWN)
break;
tsleep(&iod->iod_flags, PWAIT, "90idle", iod->iod_sleeptimo);
}
/* mtx_lock(&Giant, MTX_DEF);*/
kthread_exit(0);
}
int
smb_iod_create(struct smb_vc *vcp)
{
struct smbiod *iod;
int error;
iod = smb_zmalloc(sizeof(*iod), M_SMBIOD, M_WAITOK);
iod->iod_id = smb_iod_next++;
iod->iod_state = SMBIOD_ST_NOTCONN;
iod->iod_vc = vcp;
iod->iod_sleeptimo = hz * SMBIOD_SLEEP_TIMO;
iod->iod_pingtimo.tv_sec = SMBIOD_PING_TIMO;
getnanotime(&iod->iod_lastrqsent);
vcp->vc_iod = iod;
smb_sl_init(&iod->iod_rqlock, "90rql");
TAILQ_INIT(&iod->iod_rqlist);
smb_sl_init(&iod->iod_evlock, "90evl");
STAILQ_INIT(&iod->iod_evlist);
error = kthread_create(smb_iod_thread, iod, &iod->iod_p,
RFNOWAIT, 0, "smbiod%d", iod->iod_id);
if (error) {
SMBERROR("can't start smbiod: %d", error);
free(iod, M_SMBIOD);
return error;
}
return 0;
}
int
smb_iod_destroy(struct smbiod *iod)
{
smb_iod_request(iod, SMBIOD_EV_SHUTDOWN | SMBIOD_EV_SYNC, NULL);
smb_sl_destroy(&iod->iod_rqlock);
smb_sl_destroy(&iod->iod_evlock);
free(iod, M_SMBIOD);
return 0;
}
int
smb_iod_init(void)
{
return 0;
}
int
smb_iod_done(void)
{
return 0;
}
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