xref: /dragonfly/sys/netproto/smb/smb_trantcp.c (revision 9c600e7d) 
1 /*
2  * Copyright (c) 2000-2001 Boris Popov
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *    This product includes software developed by Boris Popov.
16  * 4. Neither the name of the author nor the names of any co-contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  * $FreeBSD: src/sys/netsmb/smb_trantcp.c,v 1.3.2.1 2001/05/22 08:32:34 bp Exp $
33  * $DragonFly: src/sys/netproto/smb/smb_trantcp.c,v 1.4 2003/07/19 21:14:45 dillon Exp $
34  */
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/mbuf.h>
40 #include <sys/proc.h>
41 #include <sys/protosw.h>
42 #include <sys/socket.h>
43 #include <sys/socketvar.h>
44 #include <sys/poll.h>
45 #include <sys/uio.h>
46 #include <sys/sysctl.h>
47 
48 #include <net/if.h>
49 #include <net/route.h>
50 
51 #include <netinet/in.h>
52 #include <netinet/tcp.h>
53 
54 #include <sys/mchain.h>
55 
56 #include <netsmb/netbios.h>
57 
58 #include <netsmb/smb.h>
59 #include <netsmb/smb_conn.h>
60 #include <netsmb/smb_tran.h>
61 #include <netsmb/smb_trantcp.h>
62 #include <netsmb/smb_subr.h>
63 
64 #define M_NBDATA	M_PCB
65 
66 static int smb_tcpsndbuf = 10 * 1024;
67 static int smb_tcprcvbuf = 10 * 1024;
68 
69 SYSCTL_DECL(_net_smb);
70 SYSCTL_INT(_net_smb, OID_AUTO, tcpsndbuf, CTLFLAG_RW, &smb_tcpsndbuf, 0, "");
71 SYSCTL_INT(_net_smb, OID_AUTO, tcprcvbuf, CTLFLAG_RW, &smb_tcprcvbuf, 0, "");
72 
73 #define nb_sosend(so,m,flags,p)	(so)->so_proto->pr_usrreqs->pru_sosend( \
74 				    so, NULL, 0, m, 0, flags, td)
75 
76 static int  nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp,
77 	u_int8_t *rpcodep, struct thread *td);
78 static int  smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td);
79 
80 static int
81 nb_setsockopt_int(struct socket *so, int level, int name, int val)
82 {
83 	struct sockopt sopt;
84 
85 	bzero(&sopt, sizeof(sopt));
86 	sopt.sopt_level = level;
87 	sopt.sopt_name = name;
88 	sopt.sopt_val = &val;
89 	sopt.sopt_valsize = sizeof(val);
90 	return sosetopt(so, &sopt);
91 }
92 
93 static __inline int
94 nb_poll(struct nbpcb *nbp, int events, struct thread *td)
95 {
96 	return nbp->nbp_tso->so_proto->pr_usrreqs->pru_sopoll(nbp->nbp_tso,
97 	    events, NULL, td);
98 }
99 
100 static int
101 nbssn_rselect(struct nbpcb *nbp, struct timeval *tv, int events, struct thread *td)
102 {
103 	struct proc *p = td->td_proc;
104 	struct timeval atv, rtv, ttv;
105 	int s, timo, error;
106 
107 	if (tv) {
108 		atv = *tv;
109 		if (itimerfix(&atv)) {
110 			error = EINVAL;
111 			goto done;
112 		}
113 		getmicrouptime(&rtv);
114 		timevaladd(&atv, &rtv);
115 	}
116 	timo = 0;
117 	KKASSERT(p);
118 retry:
119 	p->p_flag |= P_SELECT;
120 	error = nb_poll(nbp, events, td);
121 	if (error) {
122 		error = 0;
123 		goto done;
124 	}
125 	if (tv) {
126 		getmicrouptime(&rtv);
127 		if (timevalcmp(&rtv, &atv, >=))
128 			goto done;
129 		ttv = atv;
130 		timevalsub(&ttv, &rtv);
131 		timo = tvtohz(&ttv);
132 	}
133 	s = splhigh();
134 	if ((p->p_flag & P_SELECT) == 0) {
135 		splx(s);
136 		goto retry;
137 	}
138 	p->p_flag &= ~P_SELECT;
139 	error = tsleep((caddr_t)&selwait, 0, "nbsel", timo);
140 	splx(s);
141 done:
142 	p->p_flag &= ~P_SELECT;
143 	if (error == ERESTART)
144 		return 0;
145 	return error;
146 }
147 
148 static int
149 nb_intr(struct nbpcb *nbp, struct thread *td)
150 {
151 	return 0;
152 }
153 
154 static void
155 nb_upcall(struct socket *so, void *arg, int waitflag)
156 {
157 	struct nbpcb *nbp = arg;
158 
159 	if (arg == NULL || nbp->nbp_selectid == NULL)
160 		return;
161 	wakeup(nbp->nbp_selectid);
162 }
163 
164 static int
165 nb_sethdr(struct mbuf *m, u_int8_t type, u_int32_t len)
166 {
167 	u_int32_t *p = mtod(m, u_int32_t *);
168 
169 	*p = htonl((len & 0x1FFFF) | (type << 24));
170 	return 0;
171 }
172 
173 static int
174 nb_put_name(struct mbchain *mbp, struct sockaddr_nb *snb)
175 {
176 	int error;
177 	u_char seglen, *cp;
178 
179 	cp = snb->snb_name;
180 	if (*cp == 0)
181 		return EINVAL;
182 	NBDEBUG("[%s]\n", cp);
183 	for (;;) {
184 		seglen = (*cp) + 1;
185 		error = mb_put_mem(mbp, cp, seglen, MB_MSYSTEM);
186 		if (error)
187 			return error;
188 		if (seglen == 1)
189 			break;
190 		cp += seglen;
191 	}
192 	return 0;
193 }
194 
195 static int
196 nb_connect_in(struct nbpcb *nbp, struct sockaddr_in *to, struct thread *td)
197 {
198 	struct socket *so;
199 	int error, s;
200 
201 	error = socreate(AF_INET, &so, SOCK_STREAM, IPPROTO_TCP, td);
202 	if (error)
203 		return error;
204 	nbp->nbp_tso = so;
205 	so->so_upcallarg = (caddr_t)nbp;
206 	so->so_upcall = nb_upcall;
207 	so->so_rcv.sb_flags |= SB_UPCALL;
208 	so->so_rcv.sb_timeo = (5 * hz);
209 	so->so_snd.sb_timeo = (5 * hz);
210 	error = soreserve(so, nbp->nbp_sndbuf, nbp->nbp_rcvbuf);
211 	if (error)
212 		goto bad;
213 	nb_setsockopt_int(so, SOL_SOCKET, SO_KEEPALIVE, 1);
214 	nb_setsockopt_int(so, IPPROTO_TCP, TCP_NODELAY, 1);
215 	so->so_rcv.sb_flags &= ~SB_NOINTR;
216 	so->so_snd.sb_flags &= ~SB_NOINTR;
217 	error = soconnect(so, (struct sockaddr*)to, td);
218 	if (error)
219 		goto bad;
220 	s = splnet();
221 	while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
222 		tsleep(&so->so_timeo, 0, "nbcon", 2 * hz);
223 		if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0 &&
224 			(error = nb_intr(nbp, td)) != 0) {
225 			so->so_state &= ~SS_ISCONNECTING;
226 			splx(s);
227 			goto bad;
228 		}
229 	}
230 	if (so->so_error) {
231 		error = so->so_error;
232 		so->so_error = 0;
233 		splx(s);
234 		goto bad;
235 	}
236 	splx(s);
237 	return 0;
238 bad:
239 	smb_nbst_disconnect(nbp->nbp_vc, td);
240 	return error;
241 }
242 
243 static int
244 nbssn_rq_request(struct nbpcb *nbp, struct thread *td)
245 {
246 	struct mbchain mb, *mbp = &mb;
247 	struct mdchain md, *mdp = &md;
248 	struct mbuf *m0;
249 	struct timeval tv;
250 	struct sockaddr_in sin;
251 	u_short port;
252 	u_int8_t rpcode;
253 	int error, rplen;
254 
255 	error = mb_init(mbp);
256 	if (error)
257 		return error;
258 	mb_put_uint32le(mbp, 0);
259 	nb_put_name(mbp, nbp->nbp_paddr);
260 	nb_put_name(mbp, nbp->nbp_laddr);
261 	nb_sethdr(mbp->mb_top, NB_SSN_REQUEST, mb_fixhdr(mbp) - 4);
262 	error = nb_sosend(nbp->nbp_tso, mbp->mb_top, 0, td);
263 	if (!error) {
264 		nbp->nbp_state = NBST_RQSENT;
265 	}
266 	mb_detach(mbp);
267 	mb_done(mbp);
268 	if (error)
269 		return error;
270 	TIMESPEC_TO_TIMEVAL(&tv, &nbp->nbp_timo);
271 	error = nbssn_rselect(nbp, &tv, POLLIN, td);
272 	if (error == EWOULDBLOCK) {	/* Timeout */
273 		NBDEBUG("initial request timeout\n");
274 		return ETIMEDOUT;
275 	}
276 	if (error)			/* restart or interrupt */
277 		return error;
278 	error = nbssn_recv(nbp, &m0, &rplen, &rpcode, td);
279 	if (error) {
280 		NBDEBUG("recv() error %d\n", error);
281 		return error;
282 	}
283 	/*
284 	 * Process NETBIOS reply
285 	 */
286 	if (m0)
287 		md_initm(mdp, m0);
288 	error = 0;
289 	do {
290 		if (rpcode == NB_SSN_POSRESP) {
291 			nbp->nbp_state = NBST_SESSION;
292 			nbp->nbp_flags |= NBF_CONNECTED;
293 			break;
294 		}
295 		if (rpcode != NB_SSN_RTGRESP) {
296 			error = ECONNABORTED;
297 			break;
298 		}
299 		if (rplen != 6) {
300 			error = ECONNABORTED;
301 			break;
302 		}
303 		md_get_mem(mdp, (caddr_t)&sin.sin_addr, 4, MB_MSYSTEM);
304 		md_get_uint16(mdp, &port);
305 		sin.sin_port = port;
306 		nbp->nbp_state = NBST_RETARGET;
307 		smb_nbst_disconnect(nbp->nbp_vc, td);
308 		error = nb_connect_in(nbp, &sin, td);
309 		if (!error)
310 			error = nbssn_rq_request(nbp, td);
311 		if (error) {
312 			smb_nbst_disconnect(nbp->nbp_vc, td);
313 			break;
314 		}
315 	} while(0);
316 	if (m0)
317 		md_done(mdp);
318 	return error;
319 }
320 
321 static int
322 nbssn_recvhdr(struct nbpcb *nbp, int *lenp,
323 	u_int8_t *rpcodep, int flags, struct thread *td)
324 {
325 	struct socket *so = nbp->nbp_tso;
326 	struct uio auio;
327 	struct iovec aio;
328 	u_int32_t len;
329 	int error;
330 
331 	aio.iov_base = (caddr_t)&len;
332 	aio.iov_len = sizeof(len);
333 	auio.uio_iov = &aio;
334 	auio.uio_iovcnt = 1;
335 	auio.uio_segflg = UIO_SYSSPACE;
336 	auio.uio_rw = UIO_READ;
337 	auio.uio_offset = 0;
338 	auio.uio_resid = sizeof(len);
339 	auio.uio_td = td;
340 	error = so->so_proto->pr_usrreqs->pru_soreceive
341 	    (so, (struct sockaddr **)NULL, &auio,
342 	    (struct mbuf **)NULL, (struct mbuf **)NULL, &flags);
343 	if (error)
344 		return error;
345 	if (auio.uio_resid > 0) {
346 		SMBSDEBUG("short reply\n");
347 		return EPIPE;
348 	}
349 	len = ntohl(len);
350 	*rpcodep = (len >> 24) & 0xFF;
351 	len &= 0x1ffff;
352 	if (len > SMB_MAXPKTLEN) {
353 		SMBERROR("packet too long (%d)\n", len);
354 		return EFBIG;
355 	}
356 	*lenp = len;
357 	return 0;
358 }
359 
360 static int
361 nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp,
362 	u_int8_t *rpcodep, struct thread *td)
363 {
364 	struct socket *so = nbp->nbp_tso;
365 	struct uio auio;
366 	struct mbuf *m;
367 	u_int8_t rpcode;
368 	int len;
369 	int error, rcvflg;
370 
371 	if (so == NULL)
372 		return ENOTCONN;
373 
374 	if (mpp)
375 		*mpp = NULL;
376 	for(;;) {
377 		m = NULL;
378 		error = nbssn_recvhdr(nbp, &len, &rpcode, MSG_DONTWAIT, td);
379 		if (so->so_state &
380 		    (SS_ISDISCONNECTING | SS_ISDISCONNECTED | SS_CANTRCVMORE)) {
381 			nbp->nbp_state = NBST_CLOSED;
382 			NBDEBUG("session closed by peer\n");
383 			return ECONNRESET;
384 		}
385 		if (error)
386 			return error;
387 		if (len == 0 && nbp->nbp_state != NBST_SESSION)
388 			break;
389 		if (rpcode == NB_SSN_KEEPALIVE)
390 			continue;
391 		bzero(&auio, sizeof(auio));
392 		auio.uio_resid = len;
393 		auio.uio_td = td;
394 		do {
395 			rcvflg = MSG_WAITALL;
396 			error = so->so_proto->pr_usrreqs->pru_soreceive
397 			    (so, (struct sockaddr **)NULL,
398 			    &auio, &m, (struct mbuf **)NULL, &rcvflg);
399 		} while (error == EWOULDBLOCK || error == EINTR ||
400 				 error == ERESTART);
401 		if (error)
402 			break;
403 		if (auio.uio_resid > 0) {
404 			SMBERROR("packet is shorter than expected\n");
405 			error = EPIPE;
406 			break;
407 		}
408 		if (nbp->nbp_state == NBST_SESSION &&
409 		    rpcode == NB_SSN_MESSAGE)
410 			break;
411 		NBDEBUG("non-session packet %x\n", rpcode);
412 		if (m)
413 			m_freem(m);
414 	}
415 	if (error) {
416 		if (m)
417 			m_freem(m);
418 		return error;
419 	}
420 	if (mpp)
421 		*mpp = m;
422 	else
423 		m_freem(m);
424 	*lenp = len;
425 	*rpcodep = rpcode;
426 	return 0;
427 }
428 
429 /*
430  * SMB transport interface
431  */
432 static int
433 smb_nbst_create(struct smb_vc *vcp, struct thread *td)
434 {
435 	struct nbpcb *nbp;
436 
437 	MALLOC(nbp, struct nbpcb *, sizeof *nbp, M_NBDATA, M_WAITOK);
438 	bzero(nbp, sizeof *nbp);
439 	nbp->nbp_timo.tv_sec = 15;	/* XXX: sysctl ? */
440 	nbp->nbp_state = NBST_CLOSED;
441 	nbp->nbp_vc = vcp;
442 	nbp->nbp_sndbuf = smb_tcpsndbuf;
443 	nbp->nbp_rcvbuf = smb_tcprcvbuf;
444 	vcp->vc_tdata = nbp;
445 	return 0;
446 }
447 
448 static int
449 smb_nbst_done(struct smb_vc *vcp, struct thread *td)
450 {
451 	struct nbpcb *nbp = vcp->vc_tdata;
452 
453 	if (nbp == NULL)
454 		return ENOTCONN;
455 	smb_nbst_disconnect(vcp, td);
456 	if (nbp->nbp_laddr)
457 		free(nbp->nbp_laddr, M_SONAME);
458 	if (nbp->nbp_paddr)
459 		free(nbp->nbp_paddr, M_SONAME);
460 	free(nbp, M_NBDATA);
461 	return 0;
462 }
463 
464 static int
465 smb_nbst_bind(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td)
466 {
467 	struct nbpcb *nbp = vcp->vc_tdata;
468 	struct sockaddr_nb *snb;
469 	int error, slen;
470 
471 	NBDEBUG("\n");
472 	error = EINVAL;
473 	do {
474 		if (nbp->nbp_flags & NBF_LOCADDR)
475 			break;
476 		/*
477 		 * It is possible to create NETBIOS name in the kernel,
478 		 * but nothing prevents us to do it in the user space.
479 		 */
480 		if (sap == NULL)
481 			break;
482 		slen = sap->sa_len;
483 		if (slen < NB_MINSALEN)
484 			break;
485 		snb = (struct sockaddr_nb*)dup_sockaddr(sap, 1);
486 		if (snb == NULL) {
487 			error = ENOMEM;
488 			break;
489 		}
490 		nbp->nbp_laddr = snb;
491 		nbp->nbp_flags |= NBF_LOCADDR;
492 		error = 0;
493 	} while(0);
494 	return error;
495 }
496 
497 static int
498 smb_nbst_connect(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td)
499 {
500 	struct nbpcb *nbp = vcp->vc_tdata;
501 	struct sockaddr_in sin;
502 	struct sockaddr_nb *snb;
503 	struct timespec ts1, ts2;
504 	int error, slen;
505 
506 	NBDEBUG("\n");
507 	if (nbp->nbp_tso != NULL)
508 		return EISCONN;
509 	if (nbp->nbp_laddr == NULL)
510 		return EINVAL;
511 	slen = sap->sa_len;
512 	if (slen < NB_MINSALEN)
513 		return EINVAL;
514 	if (nbp->nbp_paddr) {
515 		free(nbp->nbp_paddr, M_SONAME);
516 		nbp->nbp_paddr = NULL;
517 	}
518 	snb = (struct sockaddr_nb*)dup_sockaddr(sap, 1);
519 	if (snb == NULL)
520 		return ENOMEM;
521 	nbp->nbp_paddr = snb;
522 	sin = snb->snb_addrin;
523 	getnanotime(&ts1);
524 	error = nb_connect_in(nbp, &sin, td);
525 	if (error)
526 		return error;
527 	getnanotime(&ts2);
528 	timespecsub(&ts2, &ts1);
529 	if (ts2.tv_sec == 0 && ts2.tv_sec == 0)
530 		ts2.tv_sec = 1;
531 	nbp->nbp_timo = ts2;
532 	timespecadd(&nbp->nbp_timo, &ts2);
533 	timespecadd(&nbp->nbp_timo, &ts2);
534 	timespecadd(&nbp->nbp_timo, &ts2);	/*  * 4 */
535 	error = nbssn_rq_request(nbp, td);
536 	if (error)
537 		smb_nbst_disconnect(vcp, td);
538 	return error;
539 }
540 
541 static int
542 smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td)
543 {
544 	struct nbpcb *nbp = vcp->vc_tdata;
545 	struct socket *so;
546 
547 	if (nbp == NULL || nbp->nbp_tso == NULL)
548 		return ENOTCONN;
549 	if ((so = nbp->nbp_tso) != NULL) {
550 		nbp->nbp_flags &= ~NBF_CONNECTED;
551 		nbp->nbp_tso = (struct socket *)NULL;
552 		soshutdown(so, 2);
553 		soclose(so);
554 	}
555 	if (nbp->nbp_state != NBST_RETARGET) {
556 		nbp->nbp_state = NBST_CLOSED;
557 	}
558 	return 0;
559 }
560 
561 static int
562 smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct thread *td)
563 {
564 	struct nbpcb *nbp = vcp->vc_tdata;
565 	int error;
566 
567 	if (nbp->nbp_state != NBST_SESSION) {
568 		error = ENOTCONN;
569 		goto abort;
570 	}
571 	M_PREPEND(m0, 4, M_WAITOK);
572 	if (m0 == NULL)
573 		return ENOBUFS;
574 	nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4);
575 	error = nb_sosend(nbp->nbp_tso, m0, 0, td);
576 	return error;
577 abort:
578 	if (m0)
579 		m_freem(m0);
580 	return error;
581 }
582 
583 
584 static int
585 smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct thread *td)
586 {
587 	struct nbpcb *nbp = vcp->vc_tdata;
588 	u_int8_t rpcode;
589 	int error, rplen;
590 
591 	nbp->nbp_flags |= NBF_RECVLOCK;
592 	error = nbssn_recv(nbp, mpp, &rplen, &rpcode, td);
593 	nbp->nbp_flags &= ~NBF_RECVLOCK;
594 	return error;
595 }
596 
597 static void
598 smb_nbst_timo(struct smb_vc *vcp)
599 {
600 	return;
601 }
602 
603 static void
604 smb_nbst_intr(struct smb_vc *vcp)
605 {
606 	struct nbpcb *nbp = vcp->vc_tdata;
607 
608 	if (nbp == NULL || nbp->nbp_tso == NULL)
609 		return;
610 	sorwakeup(nbp->nbp_tso);
611 	sowwakeup(nbp->nbp_tso);
612 }
613 
614 static int
615 smb_nbst_getparam(struct smb_vc *vcp, int param, void *data)
616 {
617 	struct nbpcb *nbp = vcp->vc_tdata;
618 
619 	switch (param) {
620 	    case SMBTP_SNDSZ:
621 		*(int*)data = nbp->nbp_sndbuf;
622 		break;
623 	    case SMBTP_RCVSZ:
624 		*(int*)data = nbp->nbp_rcvbuf;
625 		break;
626 	    case SMBTP_TIMEOUT:
627 		*(struct timespec*)data = nbp->nbp_timo;
628 		break;
629 	    default:
630 		return EINVAL;
631 	}
632 	return 0;
633 }
634 
635 static int
636 smb_nbst_setparam(struct smb_vc *vcp, int param, void *data)
637 {
638 	struct nbpcb *nbp = vcp->vc_tdata;
639 
640 	switch (param) {
641 	    case SMBTP_SELECTID:
642 		nbp->nbp_selectid = data;
643 		break;
644 	    default:
645 		return EINVAL;
646 	}
647 	return 0;
648 }
649 
650 /*
651  * Check for fatal errors
652  */
653 static int
654 smb_nbst_fatal(struct smb_vc *vcp, int error)
655 {
656 	switch (error) {
657 	    case ENOTCONN:
658 	    case ENETRESET:
659 	    case ECONNABORTED:
660 		return 1;
661 	}
662 	return 0;
663 }
664 
665 
666 struct smb_tran_desc smb_tran_nbtcp_desc = {
667 	SMBT_NBTCP,
668 	smb_nbst_create, smb_nbst_done,
669 	smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect,
670 	smb_nbst_send, smb_nbst_recv,
671 	smb_nbst_timo, smb_nbst_intr,
672 	smb_nbst_getparam, smb_nbst_setparam,
673 	smb_nbst_fatal
674 };
675 
676