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freebsd-dev/sys/dev/iscsi_initiator/isc_soc.c
Robert Watson ed6a66ca6c To ease changes to underlying mbuf structure and the mbuf allocator, reduce 
the knowledge of mbuf layout, and in particular constants such as M_EXT,
MLEN, MHLEN, and so on, in mbuf consumers by unifying various alignment
utility functions (M_ALIGN(), MH_ALIGN(), MEXT_ALIGN() in a single
M_ALIGN() macro, implemented by a now-inlined m_align() function:

- Move m_align() from uipc_mbuf.c to mbuf.h; mark as __inline.
- Reimplement M_ALIGN(), MH_ALIGN(), and MEXT_ALIGN() using m_align().
- Update consumers around the tree to simply use M_ALIGN().

This change eliminates a number of cases where mbuf consumers must be aware
of whether or not mbufs returned by the allocator use external storage, but
also assumptions about the size of the returned mbuf. This will make it
easier to introduce changes in how we use external storage, as well as
features such as variable-size mbufs.

Differential Revision:	https://reviews.freebsd.org/D1436
Reviewed by:	glebius, trasz, gnn, bz
Sponsored by:	EMC / Isilon Storage Division
2015-01-05 09:58:32 +00:00

702 lines
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/*-
* Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
* 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.
*
*/
/*
| $Id: isc_soc.c 998 2009-12-20 10:32:45Z danny $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_iscsi_initiator.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/ctype.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/socketvar.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/proc.h>
#include <sys/ioccom.h>
#include <sys/queue.h>
#include <sys/kthread.h>
#include <sys/syslog.h>
#include <sys/mbuf.h>
#include <sys/user.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <dev/iscsi_initiator/iscsi.h>
#include <dev/iscsi_initiator/iscsivar.h>
#ifndef NO_USE_MBUF
#define USE_MBUF
#endif
#ifdef USE_MBUF
static int ou_refcnt = 0;
/*
| function for freeing external storage for mbuf
*/
static void
ext_free(struct mbuf *m, void *a, void *b)
{
pduq_t *pq = b;
if(pq->buf != NULL) {
debug(3, "ou_refcnt=%d a=%p b=%p", ou_refcnt, a, pq->buf);
free(pq->buf, M_ISCSIBUF);
pq->buf = NULL;
}
}
int
isc_sendPDU(isc_session_t *sp, pduq_t *pq)
{
struct mbuf *mh, **mp;
pdu_t *pp = &pq->pdu;
int len, error;
debug_called(8);
/*
| mbuf for the iSCSI header
*/
MGETHDR(mh, M_WAITOK, MT_DATA);
mh->m_pkthdr.rcvif = NULL;
mh->m_next = NULL;
mh->m_len = sizeof(union ipdu_u);
if(ISOK2DIG(sp->hdrDigest, pp)) {
pp->hdr_dig = sp->hdrDigest(&pp->ipdu, sizeof(union ipdu_u), 0);
mh->m_len += sizeof(pp->hdr_dig);
if(pp->ahs_len) {
debug(2, "ahs_len=%d", pp->ahs_len);
pp->hdr_dig = sp->hdrDigest(&pp->ahs_addr, pp->ahs_len, pp->hdr_dig);
}
debug(3, "pp->hdr_dig=%04x", htonl(pp->hdr_dig));
}
if(pp->ahs_len) {
/*
| Add any AHS to the iSCSI hdr mbuf
*/
if((mh->m_len + pp->ahs_len) < MHLEN) {
M_ALIGN(mh, mh->m_len + pp->ahs_len);
bcopy(&pp->ipdu, mh->m_data, mh->m_len);
bcopy(pp->ahs_addr, mh->m_data + mh->m_len, pp->ahs_len);
mh->m_len += pp->ahs_len;
}
else
panic("len AHS=%d too big, not impleneted yet", pp->ahs_len);
}
else {
M_ALIGN(mh, mh->m_len);
bcopy(&pp->ipdu, mh->m_data, mh->m_len);
}
mh->m_pkthdr.len = mh->m_len;
mp = &mh->m_next;
if(pp->ds_len && pq->pdu.ds_addr) {
struct mbuf *md;
int off = 0;
len = pp->ds_len;
while(len > 0) {
int l;
MGET(md, M_WAITOK, MT_DATA);
md->m_ext.ext_cnt = &ou_refcnt;
l = min(MCLBYTES, len);
debug(4, "setting ext_free(arg=%p len/l=%d/%d)", pq->buf, len, l);
MEXTADD(md, pp->ds_addr + off, l, ext_free,
#if __FreeBSD_version >= 800000
pp->ds_addr + off,
#endif
pq, 0, EXT_EXTREF);
md->m_len = l;
md->m_next = NULL;
mh->m_pkthdr.len += l;
*mp = md;
mp = &md->m_next;
len -= l;
off += l;
}
if(((pp->ds_len & 03) != 0) || ISOK2DIG(sp->dataDigest, pp)) {
MGET(md, M_WAITOK, MT_DATA);
if(pp->ds_len & 03)
len = 4 - (pp->ds_len & 03);
else
len = 0;
md->m_len = len;
if(ISOK2DIG(sp->dataDigest, pp))
md->m_len += sizeof(pp->ds_dig);
M_ALIGN(md, md->m_len);
if(ISOK2DIG(sp->dataDigest, pp)) {
pp->ds_dig = sp->dataDigest(pp->ds_addr, pp->ds_len, 0);
if(len) {
bzero(md->m_data, len); // RFC says SHOULD be 0
pp->ds_dig = sp->dataDigest(md->m_data, len, pp->ds_dig);
}
bcopy(&pp->ds_dig, md->m_data+len, sizeof(pp->ds_dig));
}
md->m_next = NULL;
mh->m_pkthdr.len += md->m_len;
*mp = md;
}
}
if((error = sosend(sp->soc, NULL, NULL, mh, 0, 0, sp->td)) != 0) {
sdebug(2, "error=%d", error);
return error;
}
sp->stats.nsent++;
getbintime(&sp->stats.t_sent);
return 0;
}
#else /* NO_USE_MBUF */
int
isc_sendPDU(isc_session_t *sp, pduq_t *pq)
{
struct uio *uio = &pq->uio;
struct iovec *iv;
pdu_t *pp = &pq->pdu;
int len, error;
debug_called(8);
bzero(uio, sizeof(struct uio));
uio->uio_rw = UIO_WRITE;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_td = sp->td;
uio->uio_iov = iv = pq->iov;
iv->iov_base = &pp->ipdu;
iv->iov_len = sizeof(union ipdu_u);
uio->uio_resid = iv->iov_len;
iv++;
if(ISOK2DIG(sp->hdrDigest, pp))
pq->pdu.hdr_dig = sp->hdrDigest(&pp->ipdu, sizeof(union ipdu_u), 0);
if(pp->ahs_len) {
iv->iov_base = pp->ahs_addr;
iv->iov_len = pp->ahs_len;
uio->uio_resid += iv->iov_len;
iv++;
if(ISOK2DIG(sp->hdrDigest, pp))
pp->hdr_dig = sp->hdrDigest(&pp->ahs_addr, pp->ahs_len, pp->hdr_dig);
}
if(ISOK2DIG(sp->hdrDigest, pp)) {
debug(3, "hdr_dig=%04x", htonl(pp->hdr_dig));
iv->iov_base = &pp->hdr_dig;
iv->iov_len = sizeof(int);
uio->uio_resid += iv->iov_len ;
iv++;
}
if(pq->pdu.ds_addr && pp->ds_len) {
iv->iov_base = pp->ds_addr;
iv->iov_len = pp->ds_len;
while(iv->iov_len & 03) // the specs say it must be int alligned
iv->iov_len++;
uio->uio_resid += iv->iov_len ;
iv++;
if(ISOK2DIG(sp->dataDigest, pp)) {
pp->ds_dig = sp->dataDigest(pp->ds, pp->ds_len, 0);
iv->iov_base = &pp->ds_dig;
iv->iov_len = sizeof(pp->ds_dig);
uio->uio_resid += iv->iov_len ;
iv++;
}
}
uio->uio_iovcnt = iv - pq->iov;
sdebug(4, "pq->len=%d uio->uio_resid=%d uio->uio_iovcnt=%d", pq->len,
uio->uio_resid,
uio->uio_iovcnt);
sdebug(4, "opcode=%x iovcnt=%d uio_resid=%d itt=%x",
pp->ipdu.bhs.opcode, uio->uio_iovcnt, uio->uio_resid,
ntohl(pp->ipdu.bhs.itt));
sdebug(5, "sp=%p sp->soc=%p uio=%p sp->td=%p",
sp, sp->soc, uio, sp->td);
do {
len = uio->uio_resid;
error = sosend(sp->soc, NULL, uio, 0, 0, 0, sp->td);
if(uio->uio_resid == 0 || error || len == uio->uio_resid) {
if(uio->uio_resid) {
sdebug(2, "uio->uio_resid=%d uio->uio_iovcnt=%d error=%d len=%d",
uio->uio_resid, uio->uio_iovcnt, error, len);
if(error == 0)
error = EAGAIN; // 35
}
break;
}
/*
| XXX: untested code
*/
sdebug(1, "uio->uio_resid=%d uio->uio_iovcnt=%d",
uio->uio_resid, uio->uio_iovcnt);
iv = uio->uio_iov;
len -= uio->uio_resid;
while(uio->uio_iovcnt > 0) {
if(iv->iov_len > len) {
caddr_t bp = (caddr_t)iv->iov_base;
iv->iov_len -= len;
iv->iov_base = (void *)&bp[len];
break;
}
len -= iv->iov_len;
uio->uio_iovcnt--;
uio->uio_iov++;
iv++;
}
} while(uio->uio_resid);
if(error == 0) {
sp->stats.nsent++;
getbintime(&sp->stats.t_sent);
}
return error;
}
#endif /* USE_MBUF */
/*
| wait till a PDU header is received
| from the socket.
*/
/*
The format of the BHS is:
Byte/ 0 | 1 | 2 | 3 |
/ | | | |
|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|
+---------------+---------------+---------------+---------------+
0|.|I| Opcode |F| Opcode-specific fields |
+---------------+---------------+---------------+---------------+
4|TotalAHSLength | DataSegmentLength |
+---------------+---------------+---------------+---------------+
8| LUN or Opcode-specific fields |
+ +
12| |
+---------------+---------------+---------------+---------------+
16| Initiator Task Tag |
+---------------+---------------+---------------+---------------+
20/ Opcode-specific fields /
+/ /
+---------------+---------------+---------------+---------------+
48
*/
static __inline int
so_getbhs(isc_session_t *sp)
{
bhs_t *bhs = &sp->bhs;
struct uio *uio = &sp->uio;
struct iovec *iov = &sp->iov;
int error, flags;
debug_called(8);
iov->iov_base = bhs;
iov->iov_len = sizeof(bhs_t);
uio->uio_iov = iov;
uio->uio_iovcnt = 1;
uio->uio_rw = UIO_READ;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_td = curthread; // why ...
uio->uio_resid = sizeof(bhs_t);
flags = MSG_WAITALL;
error = soreceive(sp->soc, NULL, uio, 0, 0, &flags);
if(error)
debug(2,
#if __FreeBSD_version > 800000
"error=%d so_error=%d uio->uio_resid=%zd iov.iov_len=%zd",
#else
"error=%d so_error=%d uio->uio_resid=%d iov.iov_len=%zd",
#endif
error,
sp->soc->so_error, uio->uio_resid, iov->iov_len);
if(!error && (uio->uio_resid > 0)) {
error = EPIPE; // was EAGAIN
debug(2,
#if __FreeBSD_version > 800000
"error=%d so_error=%d uio->uio_resid=%zd iov.iov_len=%zd so_state=%x",
#else
"error=%d so_error=%d uio->uio_resid=%d iov.iov_len=%zd so_state=%x",
#endif
error,
sp->soc->so_error, uio->uio_resid, iov->iov_len, sp->soc->so_state);
}
return error;
}
/*
| so_recv gets called when
| an iSCSI header has been received.
| Note: the designers had no intentions
| in making programmer's life easy.
*/
static int
so_recv(isc_session_t *sp, pduq_t *pq)
{
sn_t *sn = &sp->sn;
struct uio *uio = &pq->uio;
pdu_t *pp = &pq->pdu;
bhs_t *bhs = &pp->ipdu.bhs;
struct iovec *iov = pq->iov;
int error;
u_int len;
u_int max, exp;
int flags = MSG_WAITALL;
debug_called(8);
/*
| now calculate how much data should be in the buffer
*/
uio->uio_iov = iov;
uio->uio_iovcnt = 0;
len = 0;
if(bhs->AHSLength) {
debug(2, "bhs->AHSLength=%d", bhs->AHSLength);
pp->ahs_len = bhs->AHSLength * 4;
len += pp->ahs_len;
pp->ahs_addr = malloc(pp->ahs_len, M_TEMP, M_WAITOK); // XXX: could get stuck here
iov->iov_base = pp->ahs_addr;
iov->iov_len = pp->ahs_len;
uio->uio_iovcnt++;
iov++;
}
if(ISOK2DIG(sp->hdrDigest, pp)) {
len += sizeof(pp->hdr_dig);
iov->iov_base = &pp->hdr_dig;
iov->iov_len = sizeof(pp->hdr_dig);
uio->uio_iovcnt++;
}
if(len) {
uio->uio_rw = UIO_READ;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_resid = len;
uio->uio_td = sp->td; // why ...
error = soreceive(sp->soc, NULL, uio, NULL, NULL, &flags);
//if(error == EAGAIN)
// XXX: this needs work! it hangs iscontrol
if(error || uio->uio_resid) {
debug(2,
#if __FreeBSD_version > 800000
"len=%d error=%d uio->uio_resid=%zd",
#else
"len=%d error=%d uio->uio_resid=%d",
#endif
len, error, uio->uio_resid);
goto out;
}
if(ISOK2DIG(sp->hdrDigest, pp)) {
bhs_t *bhs;
u_int digest;
bhs = (bhs_t *)&pp->ipdu;
digest = sp->hdrDigest(bhs, sizeof(bhs_t), 0);
if(pp->ahs_len)
digest = sp->hdrDigest(pp->ahs_addr, pp->ahs_len, digest);
if(pp->hdr_dig != digest) {
debug(2, "bad header digest: received=%x calculated=%x", pp->hdr_dig, digest);
// XXX: now what?
error = EIO;
goto out;
}
}
if(pp->ahs_len) {
debug(2, "ahs len=%x type=%x spec=%x",
pp->ahs_addr->len, pp->ahs_addr->type, pp->ahs_addr->spec);
// XXX: till I figure out what to do with this
free(pp->ahs_addr, M_TEMP);
}
pq->len += len; // XXX: who needs this?
bzero(uio, sizeof(struct uio));
len = 0;
}
if(bhs->DSLength) {
len = bhs->DSLength;
#if BYTE_ORDER == LITTLE_ENDIAN
len = ((len & 0x00ff0000) >> 16)
| (len & 0x0000ff00)
| ((len & 0x000000ff) << 16);
#endif
pp->ds_len = len;
if((sp->opt.maxRecvDataSegmentLength > 0) && (len > sp->opt.maxRecvDataSegmentLength)) {
xdebug("impossible PDU length(%d) opt.maxRecvDataSegmentLength=%d",
len, sp->opt.maxRecvDataSegmentLength);
log(LOG_ERR,
"so_recv: impossible PDU length(%d) from iSCSI %s/%s\n",
len, sp->opt.targetAddress, sp->opt.targetName);
/*
| XXX: this will really screwup the stream.
| should clear up the buffer till a valid header
| is found, or just close connection ...
| should read the RFC.
*/
error = E2BIG;
goto out;
}
while(len & 03)
len++;
if(ISOK2DIG(sp->dataDigest, pp))
len += 4;
uio->uio_resid = len;
uio->uio_td = sp->td; // why ...
pq->len += len; // XXX: do we need this?
error = soreceive(sp->soc, NULL, uio, &pq->mp, NULL, &flags);
//if(error == EAGAIN)
// XXX: this needs work! it hangs iscontrol
if(error || uio->uio_resid)
goto out;
if(ISOK2DIG(sp->dataDigest, pp)) {
struct mbuf *m;
u_int digest, ds_len, cnt;
// get the received digest
m_copydata(pq->mp,
len - sizeof(pp->ds_dig),
sizeof(pp->ds_dig),
(caddr_t)&pp->ds_dig);
// calculate all mbufs
digest = 0;
ds_len = len - sizeof(pp->ds_dig);
for(m = pq->mp; m != NULL; m = m->m_next) {
cnt = MIN(ds_len, m->m_len);
digest = sp->dataDigest(mtod(m, char *), cnt, digest);
ds_len -= cnt;
if(ds_len == 0)
break;
}
if(digest != pp->ds_dig) {
sdebug(1, "bad data digest: received=%x calculated=%x", pp->ds_dig, digest);
error = EIO; // XXX: find a better error
goto out;
}
KASSERT(ds_len == 0, ("ds_len not zero"));
}
}
sdebug(6, "len=%d] opcode=0x%x ahs_len=0x%x ds_len=0x%x",
pq->len, bhs->opcode, pp->ahs_len, pp->ds_len);
max = ntohl(bhs->MaxCmdSN);
exp = ntohl(bhs->ExpStSN);
if(max < exp - 1 &&
max > exp - _MAXINCR) {
sdebug(2, "bad cmd window size");
error = EIO; // XXX: for now;
goto out; // error
}
if(SNA_GT(max, sn->maxCmd))
sn->maxCmd = max;
if(SNA_GT(exp, sn->expCmd))
sn->expCmd = exp;
/*
| remove from the holding queue packets
| that have been acked and don't need
| further processing.
*/
i_acked_hld(sp, NULL);
sp->cws = sn->maxCmd - sn->expCmd + 1;
return 0;
out:
// XXX: need some work here
if(pp->ahs_len) {
// XXX: till I figure out what to do with this
free(pp->ahs_addr, M_TEMP);
}
xdebug("have a problem, error=%d", error);
pdu_free(sp->isc, pq);
if(!error && uio->uio_resid > 0)
error = EPIPE;
return error;
}
/*
| wait for something to arrive.
| and if the pdu is without errors, process it.
*/
static int
so_input(isc_session_t *sp)
{
pduq_t *pq;
int error;
debug_called(8);
/*
| first read in the iSCSI header
*/
error = so_getbhs(sp);
if(error == 0) {
/*
| now read the rest.
*/
pq = pdu_alloc(sp->isc, M_NOWAIT);
if(pq == NULL) { // XXX: might cause a deadlock ...
debug(2, "out of pdus, wait");
pq = pdu_alloc(sp->isc, M_WAITOK); // OK to WAIT
}
pq->pdu.ipdu.bhs = sp->bhs;
pq->len = sizeof(bhs_t); // so far only the header was read
error = so_recv(sp, pq);
if(error != 0) {
error += 0x800; // XXX: just to see the error.
// terminal error
// XXX: close connection and exit
}
else {
sp->stats.nrecv++;
getbintime(&sp->stats.t_recv);
ism_recv(sp, pq);
}
}
return error;
}
/*
| one per active (connected) session.
| this thread is responsible for reading
| in packets from the target.
*/
static void
isc_in(void *vp)
{
isc_session_t *sp = (isc_session_t *)vp;
struct socket *so = sp->soc;
int error;
debug_called(8);
sp->flags |= ISC_CON_RUNNING;
error = 0;
while((sp->flags & (ISC_CON_RUN | ISC_LINK_UP)) == (ISC_CON_RUN | ISC_LINK_UP)) {
// XXX: hunting ...
if(sp->soc == NULL || !(so->so_state & SS_ISCONNECTED)) {
debug(2, "sp->soc=%p", sp->soc);
break;
}
error = so_input(sp);
if(error == 0) {
mtx_lock(&sp->io_mtx);
if(sp->flags & ISC_OWAITING) {
wakeup(&sp->flags);
}
mtx_unlock(&sp->io_mtx);
} else if(error == EPIPE) {
break;
}
else if(error == EAGAIN) {
if(so->so_state & SS_ISCONNECTED)
// there seems to be a problem in 6.0 ...
tsleep(sp, PRIBIO, "isc_soc", 2*hz);
}
}
sdebug(2, "terminated, flags=%x so_count=%d so_state=%x error=%d proc=%p",
sp->flags, so->so_count, so->so_state, error, sp->proc);
if((sp->proc != NULL) && sp->signal) {
PROC_LOCK(sp->proc);
kern_psignal(sp->proc, sp->signal);
PROC_UNLOCK(sp->proc);
sp->flags |= ISC_SIGNALED;
sdebug(2, "pid=%d signaled(%d)", sp->proc->p_pid, sp->signal);
}
else {
// we have to do something ourselves
// like closing this session ...
}
/*
| we've been terminated
*/
// do we need this mutex ...?
mtx_lock(&sp->io_mtx);
sp->flags &= ~(ISC_CON_RUNNING | ISC_LINK_UP);
wakeup(&sp->soc);
mtx_unlock(&sp->io_mtx);
sdebug(2, "dropped ISC_CON_RUNNING");
#if __FreeBSD_version >= 800000
kproc_exit(0);
#else
kthread_exit(0);
#endif
}
void
isc_stop_receiver(isc_session_t *sp)
{
int n;
debug_called(8);
sdebug(3, "sp=%p sp->soc=%p", sp, sp? sp->soc: 0);
mtx_lock(&sp->io_mtx);
sp->flags &= ~ISC_LINK_UP;
msleep(&sp->soc, &sp->io_mtx, PRIBIO|PDROP, "isc_stpc", 5*hz);
soshutdown(sp->soc, SHUT_RD);
mtx_lock(&sp->io_mtx);
sdebug(3, "soshutdown");
sp->flags &= ~ISC_CON_RUN;
n = 2;
while(n-- && (sp->flags & ISC_CON_RUNNING)) {
sdebug(3, "waiting n=%d... flags=%x", n, sp->flags);
msleep(&sp->soc, &sp->io_mtx, PRIBIO, "isc_stpc", 5*hz);
}
mtx_unlock(&sp->io_mtx);
if(sp->fp != NULL)
fdrop(sp->fp, sp->td);
fputsock(sp->soc);
sp->soc = NULL;
sp->fp = NULL;
sdebug(3, "done");
}
void
isc_start_receiver(isc_session_t *sp)
{
debug_called(8);
sp->flags |= ISC_CON_RUN | ISC_LINK_UP;
#if __FreeBSD_version >= 800000
kproc_create
#else
kthread_create
#endif
(isc_in, sp, &sp->soc_proc, 0, 0, "isc_in %d", sp->sid);
}
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