[unix-history] / sys / netccitt / hd_subr.c

/*
 * Copyright (c) University of British Columbia, 1984
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Laboratory for Computation Vision and the Computer Science Department
 * of the University of British Columbia.
 *
 * 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 the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	from: @(#)hd_subr.c	7.6 (Berkeley) 5/29/91
 *	$Id: hd_subr.c,v 1.2 1993/10/16 19:46:37 rgrimes Exp $
 */

#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "domain.h"
#include "socket.h"
#include "protosw.h"
#include "errno.h"
#include "time.h"
#include "kernel.h"

#include "../net/if.h"

#include "hdlc.h"
#include "hd_var.h"
#include "x25.h"

void
hd_init ()
{

	hdintrq.ifq_maxlen = IFQ_MAXLEN;
}

int
hd_ctlinput (prc, addr)
	int prc;
	struct sockaddr *addr;
{
	register struct x25config *xcp = (struct x25config *)addr;
	register struct hdcb *hdp;
	register struct ifaddr *ifa;
	struct ifnet *ifp;
	caddr_t pk_newlink();

	if (addr->sa_family != AF_CCITT)
		return (EAFNOSUPPORT);
	if (xcp->xc_lptype != HDLCPROTO_LAPB)
		return (EPROTONOSUPPORT);
	ifa = ifa_ifwithaddr(addr);
	if (ifa == 0 || ifa->ifa_addr->sa_family != AF_CCITT ||
	    (ifp = ifa->ifa_ifp) == 0)
		panic ("hd_ctlinput");
	for (hdp = hdcbhead; hdp; hdp = hdp->hd_next)
		if (hdp->hd_ifp == ifp)
			break;

	if (hdp == 0) {		/* new interface */
		int error, hd_ifoutput(), hd_output();

		/* an hdcb is now too big to fit in an mbuf */
		MALLOC(hdp, struct hdcb *, sizeof (*hdp), M_PCB, M_DONTWAIT);
		if (hdp == 0)
			return (ENOBUFS);
		bzero((caddr_t)hdp, sizeof(*hdp));
		hdp->hd_pkp =
			pk_newlink ((struct x25_ifaddr *)ifa, (caddr_t)hdp);
		if (hdp -> hd_pkp == 0) {
			free(hdp, M_PCB);
			return (ENOBUFS);
		}
		hdp->hd_ifp = ifp;
		hdp->hd_ifa = ifa;
		hdp->hd_xcp = xcp;
		hdp->hd_state = INIT;
		hdp->hd_output = hd_ifoutput;
		hdp->hd_next = hdcbhead;
		hdcbhead = hdp;
	}

	switch (prc) {
	case PRC_IFUP:
		if (xcp->xc_lwsize == 0 ||
			xcp->xc_lwsize > MAX_WINDOW_SIZE)
				xcp->xc_lwsize = MAX_WINDOW_SIZE;
		if (hdp->hd_state == INIT)
			SET_TIMER (hdp);
		break;

	case PRC_IFDOWN:
		if (hdp->hd_state == ABM)
			hd_message (hdp, "Operator shutdown: link closed");
		(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
		hd_writeinternal (hdp, DISC, POLLON);
		hdp->hd_state = DISC_SENT;
		SET_TIMER (hdp);
	}
	return (0);
}

void
hd_initvars (hdp)
	register struct hdcb *hdp;
{
	register struct mbuf *m;
	register int i;

	/* Clear Transmit queue. */
	while ((m = hd_remove (&hdp->hd_txq)) != NULL)
		m_freem (m);

	/* Clear Retransmit queue. */
	i = hdp->hd_lastrxnr;
	while (i != hdp->hd_retxqi) {
		m_freem (hdp->hd_retxq[i]);
		i = (i + 1) % MODULUS;
	}
	hdp->hd_retxqi = 0;

	hdp->hd_vs = hdp->hd_vr = 0;
	hdp->hd_lasttxnr = hdp->hd_lastrxnr = 0;
	hdp->hd_rrtimer = 0;
	KILL_TIMER(hdp);
	hdp->hd_retxcnt = 0;
	hdp->hd_condition = 0;
}

int
hd_decode (hdp, frame)
	register struct hdcb *hdp;
	struct Hdlc_frame *frame;
{
	register int frametype = ILLEGAL;
	register struct Hdlc_iframe *iframe = (struct Hdlc_iframe *) frame;
	register struct Hdlc_sframe *sframe = (struct Hdlc_sframe *) frame;
	register struct Hdlc_uframe *uframe = (struct Hdlc_uframe *) frame;

	if (iframe -> hdlc_0 == 0) {
		frametype = IFRAME;
		hdp->hd_iframes_in++;
	}

	else if (sframe -> hdlc_01 == 1) {
		/* Supervisory format. */
		switch (sframe -> s2) {
		case 0: 
			frametype = RR;
			hdp->hd_rrs_in++;
			break;

		case 1: 
			frametype = RNR;
			hdp->hd_rnrs_in++;
			break;

		case 2: 
			frametype = REJ;
			hdp->hd_rejs_in++;
		}
	}
	else if (uframe -> hdlc_11 == 3) {
		/* Unnumbered format. */
		switch (uframe -> m3) {
		case 0: 
			frametype = DM;
			break;

		case 1: 
			frametype = SABM;
			break;

		case 2: 
			frametype = DISC;
			break;

		case 3: 
			frametype = UA;
			break;

		case 4: 
			frametype = FRMR;
			hdp->hd_frmrs_in++;
		}
	}
	return (frametype);
}

/* 
 *  This routine is called when the HDLC layer internally  generates a
 *  command or  response  for  the remote machine ( eg. RR, UA etc. ). 
 *  Only supervisory or unnumbered frames are processed.
 */

void
hd_writeinternal (hdp, frametype, pf)
	register struct hdcb *hdp;
	register int frametype, pf;
{
	register struct mbuf *buf;
	struct Hdlc_frame *frame;
	register struct Hdlc_sframe *sframe;
	register struct Hdlc_uframe *uframe;

	MGETHDR (buf, M_DONTWAIT, MT_HEADER);
	if (buf == 0)
		return;
	frame = mtod (buf, struct Hdlc_frame *);
	sframe = mtod (buf, struct Hdlc_sframe *);
	uframe = mtod (buf, struct Hdlc_uframe *);

	/* Assume a response - address structure for DTE */
	frame -> address = ADDRESS_A;
	buf -> m_len = 2;
	buf -> m_act = buf -> m_next = NULL;

	switch (frametype) {
	case RR: 
		frame -> control = RR_CONTROL;
		hdp->hd_rrs_out++;
		break;

	case RNR: 
		frame -> control = RNR_CONTROL;
		hdp->hd_rnrs_out++;
		break;

	case REJ: 
		frame -> control = REJ_CONTROL;
		hdp->hd_rejs_out++;
		break;

	case SABM: 
		frame -> control = SABM_CONTROL;
		frame -> address = ADDRESS_B;
		break;

	case DISC: 
		if ((hdp->hd_ifp->if_flags & IFF_UP) == 0) {
			hdp->hd_state = DISCONNECTED;
			(void) m_freem (buf);
			hd_flush (hdp->hd_ifp);
			return;
		}
		frame -> control = DISC_CONTROL;
		frame -> address = ADDRESS_B;
		break;

	case DM: 
		frame -> control = DM_CONTROL;
		break;

	case UA: 
		frame -> control = UA_CONTROL;
		break;

	case FRMR: 
		frame -> control = FRMR_CONTROL;
		bcopy ((caddr_t)&hd_frmr, (caddr_t)frame -> info, 3);
		buf -> m_len = 5;
		hdp->hd_frmrs_out++;

	}

	if (sframe -> hdlc_01 == 1) {
		/* Supervisory format - RR, REJ, or RNR. */
		sframe -> nr = hdp->hd_vr;
		sframe -> pf = pf;
		hdp->hd_lasttxnr = hdp->hd_vr;
		hdp->hd_rrtimer = 0;
	}
	else
		uframe -> pf = pf;

	hd_trace (hdp, TX, frame);
	buf -> m_pkthdr.len = buf -> m_len;
	(*hdp->hd_output) (hdp, buf);
}

struct mbuf *
hd_remove (q)
struct hdtxq *q;
{
	register struct mbuf *m;

	m = q -> head;
	if (m) {
		if ((q -> head = m -> m_act) == NULL)
			q -> tail = NULL;
		m -> m_act = 0;
	}
	return (m);
}

void
hd_append (q, m)
	register struct hdtxq *q;
	register struct mbuf *m;
{

	m -> m_act = NULL;
	if (q -> tail == NULL)
		q -> head = m;
	else
		q -> tail -> m_act = m;
	q -> tail = m;
}

void
hd_flush (ifp)
	struct ifnet *ifp;
{
	register struct mbuf *m;
	register int s;

	while (1) {
		s = splimp ();
		IF_DEQUEUE (&ifp->if_snd, m);
		splx (s);
		if (m == 0)
			break;
		m_freem (m);
	}
}

void
hd_message (hdp, msg)
	struct hdcb *hdp;
	const char *msg;
{
	char *format_ntn ();

	if (hdcbhead -> hd_next)
		printf ("HDLC(%s): %s\n", format_ntn (hdp->hd_xcp), msg);
	else
		printf ("HDLC: %s\n", msg);
}

#ifdef HDLCDEBUG
hd_status (hdp)
struct hdcb *hdp;
{
	printf ("HDLC STATUS:\n V(S)=%d, V(R)=%d, retxqi=%d,\n",
		hdp->hd_vs, hdp->hd_vr, hdp->hd_retxqi);

	printf ("Last_rx_nr=%d, Last_tx_nr=%d,\n Condition=%d, Xx=%d\n",
		hdp->hd_lastrxnr, hdp->hd_lasttxnr, hdp->hd_condition, hdp->hd_xx);
}
#endif
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) University of British Columbia, 1984
	3	* Copyright (c) 1990 The Regents of the University of California.
	4	* All rights reserved.
	5	*
	6	* This code is derived from software contributed to Berkeley by
	7	* the Laboratory for Computation Vision and the Computer Science Department
	8	* of the University of British Columbia.
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. All advertising materials mentioning features or use of this software
	19	* must display the following acknowledgement:
	20	* This product includes software developed by the University of
	21	* California, Berkeley and its contributors.
	22	* 4. Neither the name of the University nor the names of its contributors
	23	* may be used to endorse or promote products derived from this software
	24	* without specific prior written permission.
	25	*
	26	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	27	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	28	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	29	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	30	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	31	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	32	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	33	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	34	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	35	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	36	* SUCH DAMAGE.
	37	*
1cdffd64	38	* from: @(#)hd_subr.c 7.6 (Berkeley) 5/29/91
4c45483e	39	* $Id: hd_subr.c,v 1.2 1993/10/16 19:46:37 rgrimes Exp $
15637ed4 RG	40	*/
	41
	42	#include "param.h"
	43	#include "systm.h"
	44	#include "mbuf.h"
	45	#include "domain.h"
	46	#include "socket.h"
	47	#include "protosw.h"
	48	#include "errno.h"
	49	#include "time.h"
	50	#include "kernel.h"
	51
	52	#include "../net/if.h"
	53
	54	#include "hdlc.h"
	55	#include "hd_var.h"
	56	#include "x25.h"
	57
4c45483e	58	void
15637ed4 RG	59	hd_init ()
	60	{
	61
	62	hdintrq.ifq_maxlen = IFQ_MAXLEN;
	63	}
	64
4c45483e	65	int
15637ed4	66	hd_ctlinput (prc, addr)
4c45483e GW	67	int prc;
4c45483e GW	68	struct sockaddr *addr;
15637ed4 RG	69	{
	70	register struct x25config xcp = (struct x25config )addr;
	71	register struct hdcb *hdp;
	72	register struct ifaddr *ifa;
	73	struct ifnet *ifp;
	74	caddr_t pk_newlink();
	75
	76	if (addr->sa_family != AF_CCITT)
	77	return (EAFNOSUPPORT);
	78	if (xcp->xc_lptype != HDLCPROTO_LAPB)
	79	return (EPROTONOSUPPORT);
	80	ifa = ifa_ifwithaddr(addr);
	81	if (ifa == 0 \|\| ifa->ifa_addr->sa_family != AF_CCITT \|\|
	82	(ifp = ifa->ifa_ifp) == 0)
	83	panic ("hd_ctlinput");
	84	for (hdp = hdcbhead; hdp; hdp = hdp->hd_next)
	85	if (hdp->hd_ifp == ifp)
	86	break;
	87
	88	if (hdp == 0) { /* new interface */
	89	int error, hd_ifoutput(), hd_output();
	90
	91	/* an hdcb is now too big to fit in an mbuf */
	92	MALLOC(hdp, struct hdcb , sizeof (hdp), M_PCB, M_DONTWAIT);
	93	if (hdp == 0)
	94	return (ENOBUFS);
	95	bzero((caddr_t)hdp, sizeof(*hdp));
	96	hdp->hd_pkp =
	97	pk_newlink ((struct x25_ifaddr *)ifa, (caddr_t)hdp);
	98	if (hdp -> hd_pkp == 0) {
	99	free(hdp, M_PCB);
	100	return (ENOBUFS);
	101	}
	102	hdp->hd_ifp = ifp;
	103	hdp->hd_ifa = ifa;
	104	hdp->hd_xcp = xcp;
	105	hdp->hd_state = INIT;
	106	hdp->hd_output = hd_ifoutput;
	107	hdp->hd_next = hdcbhead;
	108	hdcbhead = hdp;
	109	}
	110
	111	switch (prc) {
	112	case PRC_IFUP:
	113	if (xcp->xc_lwsize == 0 \|\|
	114	xcp->xc_lwsize > MAX_WINDOW_SIZE)
	115	xcp->xc_lwsize = MAX_WINDOW_SIZE;
	116	if (hdp->hd_state == INIT)
	117	SET_TIMER (hdp);
	118	break;
	119
	120	case PRC_IFDOWN:
	121	if (hdp->hd_state == ABM)
	122	hd_message (hdp, "Operator shutdown: link closed");
	123	(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
	124	hd_writeinternal (hdp, DISC, POLLON);
	125	hdp->hd_state = DISC_SENT;
	126	SET_TIMER (hdp);
	127	}
	128	return (0);
	129	}
	130
4c45483e	131	void
15637ed4	132	hd_initvars (hdp)
4c45483e	133	register struct hdcb *hdp;
15637ed4 RG	134	{
	135	register struct mbuf *m;
	136	register int i;
	137
	138	/* Clear Transmit queue. */
	139	while ((m = hd_remove (&hdp->hd_txq)) != NULL)
	140	m_freem (m);
	141
	142	/* Clear Retransmit queue. */
	143	i = hdp->hd_lastrxnr;
	144	while (i != hdp->hd_retxqi) {
	145	m_freem (hdp->hd_retxq[i]);
	146	i = (i + 1) % MODULUS;
	147	}
	148	hdp->hd_retxqi = 0;
	149
	150	hdp->hd_vs = hdp->hd_vr = 0;
	151	hdp->hd_lasttxnr = hdp->hd_lastrxnr = 0;
	152	hdp->hd_rrtimer = 0;
	153	KILL_TIMER(hdp);
	154	hdp->hd_retxcnt = 0;
	155	hdp->hd_condition = 0;
	156	}
	157
4c45483e	158	int
15637ed4	159	hd_decode (hdp, frame)
4c45483e GW	160	register struct hdcb *hdp;
4c45483e GW	161	struct Hdlc_frame *frame;
15637ed4 RG	162	{
	163	register int frametype = ILLEGAL;
	164	register struct Hdlc_iframe iframe = (struct Hdlc_iframe ) frame;
	165	register struct Hdlc_sframe sframe = (struct Hdlc_sframe ) frame;
	166	register struct Hdlc_uframe uframe = (struct Hdlc_uframe ) frame;
	167
	168	if (iframe -> hdlc_0 == 0) {
	169	frametype = IFRAME;
	170	hdp->hd_iframes_in++;
	171	}
	172
	173	else if (sframe -> hdlc_01 == 1) {
	174	/* Supervisory format. */
	175	switch (sframe -> s2) {
	176	case 0:
	177	frametype = RR;
	178	hdp->hd_rrs_in++;
	179	break;
	180
	181	case 1:
	182	frametype = RNR;
	183	hdp->hd_rnrs_in++;
	184	break;
	185
	186	case 2:
	187	frametype = REJ;
	188	hdp->hd_rejs_in++;
	189	}
	190	}
	191	else if (uframe -> hdlc_11 == 3) {
	192	/* Unnumbered format. */
	193	switch (uframe -> m3) {
	194	case 0:
	195	frametype = DM;
	196	break;
	197
	198	case 1:
	199	frametype = SABM;
	200	break;
	201
	202	case 2:
	203	frametype = DISC;
	204	break;
	205
	206	case 3:
	207	frametype = UA;
	208	break;
	209
	210	case 4:
	211	frametype = FRMR;
	212	hdp->hd_frmrs_in++;
	213	}
	214	}
	215	return (frametype);
	216	}
	217
	218	/*
	219	* This routine is called when the HDLC layer internally generates a
	220	* command or response for the remote machine ( eg. RR, UA etc. ).
	221	* Only supervisory or unnumbered frames are processed.
	222	*/
	223
4c45483e	224	void
15637ed4	225	hd_writeinternal (hdp, frametype, pf)
4c45483e GW	226	register struct hdcb *hdp;
4c45483e GW	227	register int frametype, pf;
15637ed4 RG	228	{
	229	register struct mbuf *buf;
	230	struct Hdlc_frame *frame;
	231	register struct Hdlc_sframe *sframe;
	232	register struct Hdlc_uframe *uframe;
	233
	234	MGETHDR (buf, M_DONTWAIT, MT_HEADER);
	235	if (buf == 0)
	236	return;
	237	frame = mtod (buf, struct Hdlc_frame *);
	238	sframe = mtod (buf, struct Hdlc_sframe *);
	239	uframe = mtod (buf, struct Hdlc_uframe *);
	240
	241	/* Assume a response - address structure for DTE */
	242	frame -> address = ADDRESS_A;
	243	buf -> m_len = 2;
	244	buf -> m_act = buf -> m_next = NULL;
	245
	246	switch (frametype) {
	247	case RR:
	248	frame -> control = RR_CONTROL;
	249	hdp->hd_rrs_out++;
	250	break;
	251
	252	case RNR:
	253	frame -> control = RNR_CONTROL;
	254	hdp->hd_rnrs_out++;
	255	break;
	256
	257	case REJ:
	258	frame -> control = REJ_CONTROL;
	259	hdp->hd_rejs_out++;
	260	break;
	261
	262	case SABM:
	263	frame -> control = SABM_CONTROL;
	264	frame -> address = ADDRESS_B;
	265	break;
	266
	267	case DISC:
	268	if ((hdp->hd_ifp->if_flags & IFF_UP) == 0) {
	269	hdp->hd_state = DISCONNECTED;
	270	(void) m_freem (buf);
	271	hd_flush (hdp->hd_ifp);
	272	return;
	273	}
	274	frame -> control = DISC_CONTROL;
	275	frame -> address = ADDRESS_B;
	276	break;
	277
	278	case DM:
	279	frame -> control = DM_CONTROL;
	280	break;
	281
	282	case UA:
	283	frame -> control = UA_CONTROL;
	284	break;
	285
	286	case FRMR:
	287	frame -> control = FRMR_CONTROL;
	288	bcopy ((caddr_t)&hd_frmr, (caddr_t)frame -> info, 3);
	289	buf -> m_len = 5;
	290	hdp->hd_frmrs_out++;
	291
292	}
293
294	if (sframe -> hdlc_01 == 1) {
295	/* Supervisory format - RR, REJ, or RNR. */
296	sframe -> nr = hdp->hd_vr;
297	sframe -> pf = pf;
298	hdp->hd_lasttxnr = hdp->hd_vr;
299	hdp->hd_rrtimer = 0;
300	}
301	else
302	uframe -> pf = pf;
303
304	hd_trace (hdp, TX, frame);
305	buf -> m_pkthdr.len = buf -> m_len;
306	(*hdp->hd_output) (hdp, buf);
307	}
308
309	struct mbuf *
310	hd_remove (q)
311	struct hdtxq *q;
312	{
313	register struct mbuf *m;
314
315	m = q -> head;
316	if (m) {
317	if ((q -> head = m -> m_act) == NULL)
318	q -> tail = NULL;
319	m -> m_act = 0;
320	}
321	return (m);
322	}
323
4c45483e	324	void
15637ed4	325	hd_append (q, m)
4c45483e GW	326	register struct hdtxq *q;
4c45483e GW	327	register struct mbuf *m;
15637ed4 RG	328	{
	329
	330	m -> m_act = NULL;
	331	if (q -> tail == NULL)
	332	q -> head = m;
	333	else
	334	q -> tail -> m_act = m;
	335	q -> tail = m;
	336	}
	337
4c45483e	338	void
15637ed4	339	hd_flush (ifp)
4c45483e	340	struct ifnet *ifp;
15637ed4 RG	341	{
	342	register struct mbuf *m;
	343	register int s;
	344
	345	while (1) {
	346	s = splimp ();
	347	IF_DEQUEUE (&ifp->if_snd, m);
	348	splx (s);
	349	if (m == 0)
	350	break;
	351	m_freem (m);
	352	}
	353	}
	354
4c45483e	355	void
15637ed4	356	hd_message (hdp, msg)
4c45483e GW	357	struct hdcb *hdp;
4c45483e GW	358	const char *msg;
15637ed4 RG	359	{
	360	char *format_ntn ();
	361
	362	if (hdcbhead -> hd_next)
	363	printf ("HDLC(%s): %s\n", format_ntn (hdp->hd_xcp), msg);
	364	else
	365	printf ("HDLC: %s\n", msg);
	366	}
	367
	368	#ifdef HDLCDEBUG
	369	hd_status (hdp)
	370	struct hdcb *hdp;
	371	{
	372	printf ("HDLC STATUS:\n V(S)=%d, V(R)=%d, retxqi=%d,\n",
	373	hdp->hd_vs, hdp->hd_vr, hdp->hd_retxqi);
	374
	375	printf ("Last_rx_nr=%d, Last_tx_nr=%d,\n Condition=%d, Xx=%d\n",
	376	hdp->hd_lastrxnr, hdp->hd_lasttxnr, hdp->hd_condition, hdp->hd_xx);
	377	}
	378	#endif