xref: /freebsd/sys/netsmb/smb_trantcp.c (revision 535af610) 
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2000-2001 Boris Popov
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 
32 #include <sys/param.h>
33 #include <sys/condvar.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/malloc.h>
37 #include <sys/mbuf.h>
38 #include <sys/poll.h>
39 #include <sys/proc.h>
40 #include <sys/protosw.h>
41 #include <sys/signalvar.h>
42 #include <sys/socket.h>
43 #include <sys/socketvar.h>
44 #include <sys/sx.h>
45 #include <sys/sysctl.h>
46 #include <sys/systm.h>
47 #include <sys/uio.h>
48 
49 #include <net/if.h>
50 #include <net/route.h>
51 #include <net/vnet.h>
52 
53 #include <netinet/in.h>
54 #include <netinet/tcp.h>
55 
56 #include <sys/mchain.h>
57 
58 #include <netsmb/netbios.h>
59 
60 #include <netsmb/smb.h>
61 #include <netsmb/smb_conn.h>
62 #include <netsmb/smb_tran.h>
63 #include <netsmb/smb_trantcp.h>
64 #include <netsmb/smb_subr.h>
65 
66 #define M_NBDATA	M_PCB
67 
68 static int smb_tcpsndbuf = NB_SNDQ - 1;
69 static int smb_tcprcvbuf = NB_RCVQ - 1;
70 
71 SYSCTL_DECL(_net_smb);
72 SYSCTL_INT(_net_smb, OID_AUTO, tcpsndbuf, CTLFLAG_RW, &smb_tcpsndbuf, 0, "");
73 SYSCTL_INT(_net_smb, OID_AUTO, tcprcvbuf, CTLFLAG_RW, &smb_tcprcvbuf, 0, "");
74 
75 #define nb_sosend(so,m,flags,td) sosend(so, NULL, 0, m, 0, flags, td)
76 
77 static int  nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp,
78 	u_int8_t *rpcodep, struct thread *td);
79 static int  smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td);
80 
81 static int
82 nb_setsockopt_int(struct socket *so, int level, int name, int val)
83 {
84 	struct sockopt sopt;
85 	int error;
86 
87 	bzero(&sopt, sizeof(sopt));
88 	sopt.sopt_level = level;
89 	sopt.sopt_name = name;
90 	sopt.sopt_val = &val;
91 	sopt.sopt_valsize = sizeof(val);
92 	CURVNET_SET(so->so_vnet);
93 	error = sosetopt(so, &sopt);
94 	CURVNET_RESTORE();
95 	return error;
96 }
97 
98 static int
99 nb_intr(struct nbpcb *nbp, struct proc *p)
100 {
101 	return 0;
102 }
103 
104 static int
105 nb_upcall(struct socket *so, void *arg, int waitflag)
106 {
107 	struct nbpcb *nbp = arg;
108 
109 	if (arg == NULL || nbp->nbp_selectid == NULL)
110 		return (SU_OK);
111 	wakeup(nbp->nbp_selectid);
112 	return (SU_OK);
113 }
114 
115 static int
116 nb_sethdr(struct mbuf *m, u_int8_t type, u_int32_t len)
117 {
118 	u_int32_t *p = mtod(m, u_int32_t *);
119 
120 	*p = htonl((len & 0x1FFFF) | (type << 24));
121 	return 0;
122 }
123 
124 static int
125 nb_put_name(struct mbchain *mbp, struct sockaddr_nb *snb)
126 {
127 	int error;
128 	u_char seglen, *cp;
129 
130 	cp = snb->snb_name;
131 	if (*cp == 0)
132 		return EINVAL;
133 	NBDEBUG("[%s]\n", cp);
134 	for (;;) {
135 		seglen = (*cp) + 1;
136 		error = mb_put_mem(mbp, cp, seglen, MB_MSYSTEM);
137 		if (error)
138 			return error;
139 		if (seglen == 1)
140 			break;
141 		cp += seglen;
142 	}
143 	return 0;
144 }
145 
146 static int
147 nb_connect_in(struct nbpcb *nbp, struct sockaddr_in *to, struct thread *td)
148 {
149 	struct socket *so;
150 	int error, s;
151 
152 	error = socreate(AF_INET, &so, SOCK_STREAM, IPPROTO_TCP,
153 	    td->td_ucred, td);
154 	if (error)
155 		return error;
156 	nbp->nbp_tso = so;
157 	SOCKBUF_LOCK(&so->so_rcv);
158 	soupcall_set(so, SO_RCV, nb_upcall, nbp);
159 	SOCKBUF_UNLOCK(&so->so_rcv);
160 	so->so_rcv.sb_timeo = (5 * SBT_1S);
161 	so->so_snd.sb_timeo = (5 * SBT_1S);
162 	error = soreserve(so, nbp->nbp_sndbuf, nbp->nbp_rcvbuf);
163 	if (error)
164 		goto bad;
165 	nb_setsockopt_int(so, SOL_SOCKET, SO_KEEPALIVE, 1);
166 	nb_setsockopt_int(so, IPPROTO_TCP, TCP_NODELAY, 1);
167 	SOCKBUF_LOCK(&so->so_rcv);
168 	so->so_rcv.sb_flags &= ~SB_NOINTR;
169 	SOCKBUF_UNLOCK(&so->so_rcv);
170 	SOCKBUF_LOCK(&so->so_snd);
171 	so->so_snd.sb_flags &= ~SB_NOINTR;
172 	SOCKBUF_UNLOCK(&so->so_snd);
173 	error = soconnect(so, (struct sockaddr*)to, td);
174 	if (error)
175 		goto bad;
176 	s = splnet();
177 	while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
178 		tsleep(&so->so_timeo, PSOCK, "nbcon", 2 * hz);
179 		if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0 &&
180 			(error = nb_intr(nbp, td->td_proc)) != 0) {
181 			so->so_state &= ~SS_ISCONNECTING;
182 			splx(s);
183 			goto bad;
184 		}
185 	}
186 	if (so->so_error) {
187 		error = so->so_error;
188 		so->so_error = 0;
189 		splx(s);
190 		goto bad;
191 	}
192 	splx(s);
193 	return 0;
194 bad:
195 	smb_nbst_disconnect(nbp->nbp_vc, td);
196 	return error;
197 }
198 
199 static int
200 nbssn_rq_request(struct nbpcb *nbp, struct thread *td)
201 {
202 	struct mbchain *mbp;
203 	struct mdchain *mdp;
204 	struct mbuf *m0;
205 	struct timeval tv;
206 	struct sockaddr_in sin;
207 	u_short port;
208 	u_int8_t rpcode;
209 	int error, rplen;
210 
211 	mbp = malloc(sizeof(struct mbchain), M_NBDATA, M_WAITOK);
212 	mdp = malloc(sizeof(struct mbchain), M_NBDATA, M_WAITOK);
213 	error = mb_init(mbp);
214 	if (error) {
215 		free(mbp, M_NBDATA);
216 		free(mdp, M_NBDATA);
217 		return error;
218 	}
219 	mb_put_uint32le(mbp, 0);
220 	nb_put_name(mbp, nbp->nbp_paddr);
221 	nb_put_name(mbp, nbp->nbp_laddr);
222 	nb_sethdr(mbp->mb_top, NB_SSN_REQUEST, mb_fixhdr(mbp) - 4);
223 	error = nb_sosend(nbp->nbp_tso, mbp->mb_top, 0, td);
224 	if (!error) {
225 		nbp->nbp_state = NBST_RQSENT;
226 	}
227 	mb_detach(mbp);
228 	mb_done(mbp);
229 	free(mbp, M_NBDATA);
230 	if (error) {
231 		free(mdp, M_NBDATA);
232 		return error;
233 	}
234 	TIMESPEC_TO_TIMEVAL(&tv, &nbp->nbp_timo);
235 	error = selsocket(nbp->nbp_tso, POLLIN, &tv, td);
236 	if (error == EWOULDBLOCK) {	/* Timeout */
237 		NBDEBUG("initial request timeout\n");
238 		free(mdp, M_NBDATA);
239 		return ETIMEDOUT;
240 	}
241 	if (error) {			/* restart or interrupt */
242 		free(mdp, M_NBDATA);
243 		return error;
244 	}
245 	error = nbssn_recv(nbp, &m0, &rplen, &rpcode, td);
246 	if (error) {
247 		NBDEBUG("recv() error %d\n", error);
248 		free(mdp, M_NBDATA);
249 		return error;
250 	}
251 	/*
252 	 * Process NETBIOS reply
253 	 */
254 	if (m0)
255 		md_initm(mdp, m0);
256 	error = 0;
257 	do {
258 		if (rpcode == NB_SSN_POSRESP) {
259 			nbp->nbp_state = NBST_SESSION;
260 			nbp->nbp_flags |= NBF_CONNECTED;
261 			break;
262 		}
263 		if (rpcode != NB_SSN_RTGRESP) {
264 			error = ECONNABORTED;
265 			break;
266 		}
267 		if (rplen != 6) {
268 			error = ECONNABORTED;
269 			break;
270 		}
271 		md_get_mem(mdp, (caddr_t)&sin.sin_addr, 4, MB_MSYSTEM);
272 		md_get_uint16(mdp, &port);
273 		sin.sin_port = port;
274 		nbp->nbp_state = NBST_RETARGET;
275 		smb_nbst_disconnect(nbp->nbp_vc, td);
276 		error = nb_connect_in(nbp, &sin, td);
277 		if (!error)
278 			error = nbssn_rq_request(nbp, td);
279 		if (error) {
280 			smb_nbst_disconnect(nbp->nbp_vc, td);
281 			break;
282 		}
283 	} while(0);
284 	if (m0)
285 		md_done(mdp);
286 	free(mdp, M_NBDATA);
287 	return error;
288 }
289 
290 static int
291 nbssn_recvhdr(struct nbpcb *nbp, int *lenp,
292 	u_int8_t *rpcodep, int flags, struct thread *td)
293 {
294 	struct socket *so = nbp->nbp_tso;
295 	struct uio auio;
296 	struct iovec aio;
297 	u_int32_t len;
298 	int error;
299 
300 	aio.iov_base = (caddr_t)&len;
301 	aio.iov_len = sizeof(len);
302 	auio.uio_iov = &aio;
303 	auio.uio_iovcnt = 1;
304 	auio.uio_segflg = UIO_SYSSPACE;
305 	auio.uio_rw = UIO_READ;
306 	auio.uio_offset = 0;
307 	auio.uio_resid = sizeof(len);
308 	auio.uio_td = td;
309 	CURVNET_SET(so->so_vnet);
310 	error = soreceive(so, (struct sockaddr **)NULL, &auio,
311 	    (struct mbuf **)NULL, (struct mbuf **)NULL, &flags);
312 	CURVNET_RESTORE();
313 	if (error)
314 		return error;
315 	if (auio.uio_resid > 0) {
316 		SMBSDEBUG("short reply\n");
317 		return EPIPE;
318 	}
319 	len = ntohl(len);
320 	*rpcodep = (len >> 24) & 0xFF;
321 	len &= 0x1ffff;
322 	if (len > SMB_MAXPKTLEN) {
323 		SMBERROR("packet too long (%d)\n", len);
324 		return EFBIG;
325 	}
326 	*lenp = len;
327 	return 0;
328 }
329 
330 static int
331 nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp,
332 	u_int8_t *rpcodep, struct thread *td)
333 {
334 	struct socket *so = nbp->nbp_tso;
335 	struct uio auio;
336 	struct mbuf *m, *tm, *im;
337 	u_int8_t rpcode;
338 	int len, resid;
339 	int error, rcvflg;
340 
341 	if (so == NULL)
342 		return ENOTCONN;
343 
344 	if (mpp)
345 		*mpp = NULL;
346 	m = NULL;
347 	for(;;) {
348 		/*
349 		 * Poll for a response header.
350 		 * If we don't have one waiting, return.
351 		 */
352 		len = 0;
353 		rpcode = 0;
354 		error = nbssn_recvhdr(nbp, &len, &rpcode, MSG_DONTWAIT, td);
355 		if ((so->so_state & (SS_ISDISCONNECTING | SS_ISDISCONNECTED)) ||
356 		    (so->so_rcv.sb_state & SBS_CANTRCVMORE)) {
357 			nbp->nbp_state = NBST_CLOSED;
358 			NBDEBUG("session closed by peer\n");
359 			return ECONNRESET;
360 		}
361 		if (error)
362 			return error;
363 		if (len == 0 && nbp->nbp_state != NBST_SESSION)
364 			break;
365 		/* no data, try again */
366 		if (rpcode == NB_SSN_KEEPALIVE)
367 			continue;
368 
369 		/*
370 		 * Loop, blocking, for data following the response header.
371 		 *
372 		 * Note that we can't simply block here with MSG_WAITALL for the
373 		 * entire response size, as it may be larger than the TCP
374 		 * slow-start window that the sender employs.  This will result
375 		 * in the sender stalling until the delayed ACK is sent, then
376 		 * resuming slow-start, resulting in very poor performance.
377 		 *
378 		 * Instead, we never request more than NB_SORECEIVE_CHUNK
379 		 * bytes at a time, resulting in an ack being pushed by
380 		 * the TCP code at the completion of each call.
381 		 */
382 		resid = len;
383 		while (resid > 0) {
384 			tm = NULL;
385 			rcvflg = MSG_WAITALL;
386 			bzero(&auio, sizeof(auio));
387 			auio.uio_resid = min(resid, NB_SORECEIVE_CHUNK);
388 			auio.uio_td = td;
389 			resid -= auio.uio_resid;
390 			/*
391 			 * Spin until we have collected everything in
392 			 * this chunk.
393 			 */
394 			do {
395 				rcvflg = MSG_WAITALL;
396 				CURVNET_SET(so->so_vnet);
397 				error = soreceive(so, (struct sockaddr **)NULL,
398 				    &auio, &tm, (struct mbuf **)NULL, &rcvflg);
399 				CURVNET_RESTORE();
400 			} while (error == EWOULDBLOCK || error == EINTR ||
401 				 error == ERESTART);
402 			if (error)
403 				goto out;
404 			/* short return guarantees unhappiness */
405 			if (auio.uio_resid > 0) {
406 				SMBERROR("packet is shorter than expected\n");
407 				error = EPIPE;
408 				goto out;
409 			}
410 			/* append received chunk to previous chunk(s) */
411 			if (m == NULL) {
412 				m = tm;
413 			} else {
414 				/*
415 				 * Just glue the new chain on the end.
416 				 * Consumer will pullup as required.
417 				 */
418 				for (im = m; im->m_next != NULL; im = im->m_next)
419 					;
420 				im->m_next = tm;
421 			}
422 		}
423 		/* got a session/message packet? */
424 		if (nbp->nbp_state == NBST_SESSION &&
425 		    rpcode == NB_SSN_MESSAGE)
426 			break;
427 		/* drop packet and try for another */
428 		NBDEBUG("non-session packet %x\n", rpcode);
429 		if (m) {
430 			m_freem(m);
431 			m = NULL;
432 		}
433 	}
434 
435 out:
436 	if (error) {
437 		if (m)
438 			m_freem(m);
439 		return error;
440 	}
441 	if (mpp)
442 		*mpp = m;
443 	else
444 		m_freem(m);
445 	*lenp = len;
446 	*rpcodep = rpcode;
447 	return 0;
448 }
449 
450 /*
451  * SMB transport interface
452  */
453 static int
454 smb_nbst_create(struct smb_vc *vcp, struct thread *td)
455 {
456 	struct nbpcb *nbp;
457 
458 	nbp = malloc(sizeof *nbp, M_NBDATA, M_WAITOK);
459 	bzero(nbp, sizeof *nbp);
460 	nbp->nbp_timo.tv_sec = 15;	/* XXX: sysctl ? */
461 	nbp->nbp_state = NBST_CLOSED;
462 	nbp->nbp_vc = vcp;
463 	nbp->nbp_sndbuf = smb_tcpsndbuf;
464 	nbp->nbp_rcvbuf = smb_tcprcvbuf;
465 	vcp->vc_tdata = nbp;
466 	return 0;
467 }
468 
469 static int
470 smb_nbst_done(struct smb_vc *vcp, struct thread *td)
471 {
472 	struct nbpcb *nbp = vcp->vc_tdata;
473 
474 	if (nbp == NULL)
475 		return ENOTCONN;
476 	smb_nbst_disconnect(vcp, td);
477 	if (nbp->nbp_laddr)
478 		free(nbp->nbp_laddr, M_SONAME);
479 	if (nbp->nbp_paddr)
480 		free(nbp->nbp_paddr, M_SONAME);
481 	free(nbp, M_NBDATA);
482 	return 0;
483 }
484 
485 static int
486 smb_nbst_bind(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td)
487 {
488 	struct nbpcb *nbp = vcp->vc_tdata;
489 	struct sockaddr_nb *snb;
490 	int error, slen;
491 
492 	NBDEBUG("\n");
493 	error = EINVAL;
494 	do {
495 		if (nbp->nbp_flags & NBF_LOCADDR)
496 			break;
497 		/*
498 		 * It is possible to create NETBIOS name in the kernel,
499 		 * but nothing prevents us to do it in the user space.
500 		 */
501 		if (sap == NULL)
502 			break;
503 		slen = sap->sa_len;
504 		if (slen < NB_MINSALEN)
505 			break;
506 		snb = (struct sockaddr_nb*)sodupsockaddr(sap, M_WAITOK);
507 		if (snb == NULL) {
508 			error = ENOMEM;
509 			break;
510 		}
511 		nbp->nbp_laddr = snb;
512 		nbp->nbp_flags |= NBF_LOCADDR;
513 		error = 0;
514 	} while(0);
515 	return error;
516 }
517 
518 static int
519 smb_nbst_connect(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td)
520 {
521 	struct nbpcb *nbp = vcp->vc_tdata;
522 	struct sockaddr_in sin;
523 	struct sockaddr_nb *snb;
524 	struct timespec ts1, ts2;
525 	int error, slen;
526 
527 	NBDEBUG("\n");
528 	if (nbp->nbp_tso != NULL)
529 		return EISCONN;
530 	if (nbp->nbp_laddr == NULL)
531 		return EINVAL;
532 	slen = sap->sa_len;
533 	if (slen < NB_MINSALEN)
534 		return EINVAL;
535 	if (nbp->nbp_paddr) {
536 		free(nbp->nbp_paddr, M_SONAME);
537 		nbp->nbp_paddr = NULL;
538 	}
539 	snb = (struct sockaddr_nb*)sodupsockaddr(sap, M_WAITOK);
540 	if (snb == NULL)
541 		return ENOMEM;
542 	nbp->nbp_paddr = snb;
543 	sin = snb->snb_addrin;
544 	getnanotime(&ts1);
545 	error = nb_connect_in(nbp, &sin, td);
546 	if (error)
547 		return error;
548 	getnanotime(&ts2);
549 	timespecsub(&ts2, &ts1, &ts2);
550 	if (ts2.tv_sec == 0) {
551 		ts2.tv_sec = 1;
552 		ts2.tv_nsec = 0;
553 	}
554 	timespecadd(&ts2, &ts2, &nbp->nbp_timo);
555 	timespecadd(&nbp->nbp_timo, &ts2, &nbp->nbp_timo);
556 	timespecadd(&nbp->nbp_timo, &ts2, &nbp->nbp_timo);	/*  * 4 */
557 	error = nbssn_rq_request(nbp, td);
558 	if (error)
559 		smb_nbst_disconnect(vcp, td);
560 	return error;
561 }
562 
563 static int
564 smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td)
565 {
566 	struct nbpcb *nbp = vcp->vc_tdata;
567 	struct socket *so;
568 
569 	if (nbp == NULL || nbp->nbp_tso == NULL)
570 		return ENOTCONN;
571 	if ((so = nbp->nbp_tso) != NULL) {
572 		nbp->nbp_flags &= ~NBF_CONNECTED;
573 		nbp->nbp_tso = (struct socket *)NULL;
574 		soshutdown(so, 2);
575 		soclose(so);
576 	}
577 	if (nbp->nbp_state != NBST_RETARGET) {
578 		nbp->nbp_state = NBST_CLOSED;
579 	}
580 	return 0;
581 }
582 
583 static int
584 smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct thread *td)
585 {
586 	struct nbpcb *nbp = vcp->vc_tdata;
587 	int error;
588 
589 	if (nbp->nbp_state != NBST_SESSION) {
590 		error = ENOTCONN;
591 		goto abort;
592 	}
593 	M_PREPEND(m0, 4, M_WAITOK);
594 	nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4);
595 	error = nb_sosend(nbp->nbp_tso, m0, 0, td);
596 	return error;
597 abort:
598 	if (m0)
599 		m_freem(m0);
600 	return error;
601 }
602 
603 static int
604 smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct thread *td)
605 {
606 	struct nbpcb *nbp = vcp->vc_tdata;
607 	u_int8_t rpcode;
608 	int error, rplen;
609 
610 	nbp->nbp_flags |= NBF_RECVLOCK;
611 	error = nbssn_recv(nbp, mpp, &rplen, &rpcode, td);
612 	nbp->nbp_flags &= ~NBF_RECVLOCK;
613 	return error;
614 }
615 
616 static void
617 smb_nbst_timo(struct smb_vc *vcp)
618 {
619 	return;
620 }
621 
622 static void
623 smb_nbst_intr(struct smb_vc *vcp)
624 {
625 	struct nbpcb *nbp = vcp->vc_tdata;
626 
627 	if (nbp == NULL || nbp->nbp_tso == NULL)
628 		return;
629 	sorwakeup(nbp->nbp_tso);
630 	sowwakeup(nbp->nbp_tso);
631 }
632 
633 static int
634 smb_nbst_getparam(struct smb_vc *vcp, int param, void *data)
635 {
636 	struct nbpcb *nbp = vcp->vc_tdata;
637 
638 	switch (param) {
639 	    case SMBTP_SNDSZ:
640 		*(int*)data = nbp->nbp_sndbuf;
641 		break;
642 	    case SMBTP_RCVSZ:
643 		*(int*)data = nbp->nbp_rcvbuf;
644 		break;
645 	    case SMBTP_TIMEOUT:
646 		*(struct timespec*)data = nbp->nbp_timo;
647 		break;
648 	    default:
649 		return EINVAL;
650 	}
651 	return 0;
652 }
653 
654 static int
655 smb_nbst_setparam(struct smb_vc *vcp, int param, void *data)
656 {
657 	struct nbpcb *nbp = vcp->vc_tdata;
658 
659 	switch (param) {
660 	    case SMBTP_SELECTID:
661 		nbp->nbp_selectid = data;
662 		break;
663 	    default:
664 		return EINVAL;
665 	}
666 	return 0;
667 }
668 
669 /*
670  * Check for fatal errors
671  */
672 static int
673 smb_nbst_fatal(struct smb_vc *vcp, int error)
674 {
675 	switch (error) {
676 	    case ENOTCONN:
677 	    case ENETRESET:
678 	    case ECONNABORTED:
679 		return 1;
680 	}
681 	return 0;
682 }
683 
684 struct smb_tran_desc smb_tran_nbtcp_desc = {
685 	SMBT_NBTCP,
686 	smb_nbst_create, smb_nbst_done,
687 	smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect,
688 	smb_nbst_send, smb_nbst_recv,
689 	smb_nbst_timo, smb_nbst_intr,
690 	smb_nbst_getparam, smb_nbst_setparam,
691 	smb_nbst_fatal
692 };
693