[unix-history] / usr / src / 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.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)hd_subr.c	7.8 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>

#include <net/if.h>

#include <netccitt/hdlc.h>
#include <netccitt/hd_var.h>
#include <netccitt/x25.h>

hd_init ()
{

	hdintrq.ifq_maxlen = IFQ_MAXLEN;
}

hd_ctlinput (prc, addr)
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 =
			(caddr_t) pk_newlink ((struct x25_ifaddr *) ifa, 
					      (caddr_t) hdp);
		((struct x25_ifaddr *)ifa)->ia_pkcb = 
			(struct pkcb *) hdp->hd_pkp;
		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;
	} else if (hdp->hd_pkp == 0) { /* interface got reconfigured */
		hdp->hd_pkp =
			(caddr_t) pk_newlink ((struct x25_ifaddr *) ifa, 
					      (caddr_t) hdp);
		((struct x25_ifaddr *)ifa)->ia_pkcb = 
			(struct pkcb *) hdp->hd_pkp;
		if (hdp -> hd_pkp == 0) {
			free(hdp, M_PCB);
			return (ENOBUFS);
		}
	}

	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);

		/* fall thru to ... */

	case PRC_DISCONNECT_REQUEST:
		/* drop reference to pkcb --- it's dead meat */
		hdp->hd_pkp = (caddr_t) 0;
		((struct x25_ifaddr *)ifa)->ia_pkcb = (struct pkcb *) 0;

		hd_writeinternal (hdp, DISC, POLLON);
		hdp->hd_state = DISC_SENT;
		SET_TIMER (hdp);
	}
	return (0);
}

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;
}

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.
 */

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);
}

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;
}

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);
	}
}

hd_message (hdp, msg)
struct hdcb *hdp;
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
21e3a7bd KS	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	* %sccs.include.redist.c%
	11	*
dfa4fd4b	12	* @(#)hd_subr.c 7.8 (Berkeley) %G%
21e3a7bd	13	*/
edc74019	14
5548a02f KB	15	#include <sys/param.h>
	16	#include <sys/systm.h>
	17	#include <sys/mbuf.h>
	18	#include <sys/domain.h>
	19	#include <sys/socket.h>
	20	#include <sys/protosw.h>
	21	#include <sys/errno.h>
	22	#include <sys/time.h>
	23	#include <sys/kernel.h>
edc74019	24
5548a02f	25	#include <net/if.h>
edc74019	26
5548a02f KB	27	#include <netccitt/hdlc.h>
	28	#include <netccitt/hd_var.h>
	29	#include <netccitt/x25.h>
edc74019 KS	30
	31	hd_init ()
	32	{
	33
	34	hdintrq.ifq_maxlen = IFQ_MAXLEN;
	35	}
	36
	37	hd_ctlinput (prc, addr)
42963956	38	struct sockaddr *addr;
edc74019 KS	39	{
edc74019 KS	40	register struct x25config xcp = (struct x25config )addr;
edc74019 KS	41	register struct hdcb *hdp;
edc74019 KS	42	register struct ifaddr *ifa;
42963956	43	struct ifnet *ifp;
315951e8	44	caddr_t pk_newlink();
edc74019	45
42963956	46	if (addr->sa_family != AF_CCITT)
edc74019 KS	47	return (EAFNOSUPPORT);
	48	if (xcp->xc_lptype != HDLCPROTO_LAPB)
	49	return (EPROTONOSUPPORT);
42963956 KS	50	ifa = ifa_ifwithaddr(addr);
	51	if (ifa == 0 \|\| ifa->ifa_addr->sa_family != AF_CCITT \|\|
	52	(ifp = ifa->ifa_ifp) == 0)
edc74019 KS	53	panic ("hd_ctlinput");
	54	for (hdp = hdcbhead; hdp; hdp = hdp->hd_next)
	55	if (hdp->hd_ifp == ifp)
	56	break;
	57
	58	if (hdp == 0) { /* new interface */
42963956	59	int error, hd_ifoutput(), hd_output();
edc74019	60
42963956 KS	61	/* an hdcb is now too big to fit in an mbuf */
	62	MALLOC(hdp, struct hdcb , sizeof (hdp), M_PCB, M_DONTWAIT);
	63	if (hdp == 0)
edc74019	64	return (ENOBUFS);
42963956	65	bzero((caddr_t)hdp, sizeof(*hdp));
315951e8	66	hdp->hd_pkp =
dfa4fd4b KS	67	(caddr_t) pk_newlink ((struct x25_ifaddr *) ifa,
	68	(caddr_t) hdp);
	69	((struct x25_ifaddr *)ifa)->ia_pkcb =
	70	(struct pkcb *) hdp->hd_pkp;
315951e8 KS	71	if (hdp -> hd_pkp == 0) {
	72	free(hdp, M_PCB);
	73	return (ENOBUFS);
edc74019	74	}
42963956 KS	75	hdp->hd_ifp = ifp;
	76	hdp->hd_ifa = ifa;
	77	hdp->hd_xcp = xcp;
edc74019	78	hdp->hd_state = INIT;
42963956	79	hdp->hd_output = hd_ifoutput;
315951e8 KS	80	hdp->hd_next = hdcbhead;
315951e8 KS	81	hdcbhead = hdp;
dfa4fd4b KS	82	} else if (hdp->hd_pkp == 0) { /* interface got reconfigured */
	83	hdp->hd_pkp =
	84	(caddr_t) pk_newlink ((struct x25_ifaddr *) ifa,
	85	(caddr_t) hdp);
	86	((struct x25_ifaddr *)ifa)->ia_pkcb =
	87	(struct pkcb *) hdp->hd_pkp;
	88	if (hdp -> hd_pkp == 0) {
	89	free(hdp, M_PCB);
	90	return (ENOBUFS);
	91	}
edc74019 KS	92	}
	93
	94	switch (prc) {
	95	case PRC_IFUP:
	96	if (xcp->xc_lwsize == 0 \|\|
	97	xcp->xc_lwsize > MAX_WINDOW_SIZE)
	98	xcp->xc_lwsize = MAX_WINDOW_SIZE;
	99	if (hdp->hd_state == INIT)
	100	SET_TIMER (hdp);
	101	break;
	102
	103	case PRC_IFDOWN:
	104	if (hdp->hd_state == ABM)
	105	hd_message (hdp, "Operator shutdown: link closed");
315951e8	106	(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
dfa4fd4b KS	107
	108	/* fall thru to ... */
	109
	110	case PRC_DISCONNECT_REQUEST:
	111	/* drop reference to pkcb --- it's dead meat */
	112	hdp->hd_pkp = (caddr_t) 0;
	113	((struct x25_ifaddr )ifa)->ia_pkcb = (struct pkcb ) 0;
	114
edc74019 KS	115	hd_writeinternal (hdp, DISC, POLLON);
	116	hdp->hd_state = DISC_SENT;
	117	SET_TIMER (hdp);
	118	}
	119	return (0);
	120	}
	121
	122	hd_initvars (hdp)
	123	register struct hdcb *hdp;
	124	{
	125	register struct mbuf *m;
	126	register int i;
	127
	128	/* Clear Transmit queue. */
	129	while ((m = hd_remove (&hdp->hd_txq)) != NULL)
	130	m_freem (m);
	131
	132	/* Clear Retransmit queue. */
	133	i = hdp->hd_lastrxnr;
	134	while (i != hdp->hd_retxqi) {
	135	m_freem (hdp->hd_retxq[i]);
	136	i = (i + 1) % MODULUS;
	137	}
	138	hdp->hd_retxqi = 0;
	139
	140	hdp->hd_vs = hdp->hd_vr = 0;
	141	hdp->hd_lasttxnr = hdp->hd_lastrxnr = 0;
	142	hdp->hd_rrtimer = 0;
	143	KILL_TIMER(hdp);
	144	hdp->hd_retxcnt = 0;
	145	hdp->hd_condition = 0;
	146	}
	147
	148	hd_decode (hdp, frame)
	149	register struct hdcb *hdp;
	150	struct Hdlc_frame *frame;
	151	{
	152	register int frametype = ILLEGAL;
	153	register struct Hdlc_iframe iframe = (struct Hdlc_iframe ) frame;
	154	register struct Hdlc_sframe sframe = (struct Hdlc_sframe ) frame;
	155	register struct Hdlc_uframe uframe = (struct Hdlc_uframe ) frame;
	156
	157	if (iframe -> hdlc_0 == 0) {
	158	frametype = IFRAME;
	159	hdp->hd_iframes_in++;
	160	}
	161
	162	else if (sframe -> hdlc_01 == 1) {
	163	/* Supervisory format. */
	164	switch (sframe -> s2) {
	165	case 0:
	166	frametype = RR;
	167	hdp->hd_rrs_in++;
	168	break;
	169
	170	case 1:
	171	frametype = RNR;
	172	hdp->hd_rnrs_in++;
	173	break;
	174
	175	case 2:
	176	frametype = REJ;
	177	hdp->hd_rejs_in++;
	178	}
179	}
180	else if (uframe -> hdlc_11 == 3) {
181	/* Unnumbered format. */
182	switch (uframe -> m3) {
183	case 0:
184	frametype = DM;
185	break;
186
187	case 1:
188	frametype = SABM;
189	break;
190
191	case 2:
192	frametype = DISC;
193	break;
194
195	case 3:
196	frametype = UA;
197	break;
198
199	case 4:
200	frametype = FRMR;
201	hdp->hd_frmrs_in++;
202	}
203	}
204	return (frametype);
205	}
206
207	/*
208	* This routine is called when the HDLC layer internally generates a
209	* command or response for the remote machine ( eg. RR, UA etc. ).
210	* Only supervisory or unnumbered frames are processed.
211	*/
212
213	hd_writeinternal (hdp, frametype, pf)
214	register struct hdcb *hdp;
215	register int frametype, pf;
216	{
217	register struct mbuf *buf;
218	struct Hdlc_frame *frame;
219	register struct Hdlc_sframe *sframe;
220	register struct Hdlc_uframe *uframe;
221
42963956	222	MGETHDR (buf, M_DONTWAIT, MT_HEADER);
edc74019 KS	223	if (buf == 0)
	224	return;
	225	frame = mtod (buf, struct Hdlc_frame *);
	226	sframe = mtod (buf, struct Hdlc_sframe *);
	227	uframe = mtod (buf, struct Hdlc_uframe *);
	228
	229	/* Assume a response - address structure for DTE */
	230	frame -> address = ADDRESS_A;
	231	buf -> m_len = 2;
	232	buf -> m_act = buf -> m_next = NULL;
	233
	234	switch (frametype) {
	235	case RR:
	236	frame -> control = RR_CONTROL;
	237	hdp->hd_rrs_out++;
	238	break;
	239
	240	case RNR:
	241	frame -> control = RNR_CONTROL;
	242	hdp->hd_rnrs_out++;
	243	break;
	244
	245	case REJ:
	246	frame -> control = REJ_CONTROL;
	247	hdp->hd_rejs_out++;
	248	break;
	249
	250	case SABM:
	251	frame -> control = SABM_CONTROL;
	252	frame -> address = ADDRESS_B;
	253	break;
	254
	255	case DISC:
42963956 KS	256	if ((hdp->hd_ifp->if_flags & IFF_UP) == 0) {
	257	hdp->hd_state = DISCONNECTED;
	258	(void) m_freem (buf);
	259	hd_flush (hdp->hd_ifp);
	260	return;
	261	}
edc74019 KS	262	frame -> control = DISC_CONTROL;
	263	frame -> address = ADDRESS_B;
	264	break;
	265
	266	case DM:
	267	frame -> control = DM_CONTROL;
	268	break;
	269
	270	case UA:
	271	frame -> control = UA_CONTROL;
	272	break;
	273
	274	case FRMR:
	275	frame -> control = FRMR_CONTROL;
	276	bcopy ((caddr_t)&hd_frmr, (caddr_t)frame -> info, 3);
	277	buf -> m_len = 5;
	278	hdp->hd_frmrs_out++;
	279
	280	}
	281
	282	if (sframe -> hdlc_01 == 1) {
	283	/* Supervisory format - RR, REJ, or RNR. */
	284	sframe -> nr = hdp->hd_vr;
	285	sframe -> pf = pf;
	286	hdp->hd_lasttxnr = hdp->hd_vr;
	287	hdp->hd_rrtimer = 0;
	288	}
	289	else
	290	uframe -> pf = pf;
	291
	292	hd_trace (hdp, TX, frame);
42963956 KS	293	buf -> m_pkthdr.len = buf -> m_len;
42963956 KS	294	(*hdp->hd_output) (hdp, buf);
edc74019 KS	295	}
	296
	297	struct mbuf *
	298	hd_remove (q)
	299	struct hdtxq *q;
	300	{
	301	register struct mbuf *m;
	302
	303	m = q -> head;
	304	if (m) {
	305	if ((q -> head = m -> m_act) == NULL)
	306	q -> tail = NULL;
	307	m -> m_act = 0;
	308	}
	309	return (m);
	310	}
	311
	312	hd_append (q, m)
	313	register struct hdtxq *q;
	314	register struct mbuf *m;
	315	{
	316
	317	m -> m_act = NULL;
	318	if (q -> tail == NULL)
	319	q -> head = m;
	320	else
	321	q -> tail -> m_act = m;
	322	q -> tail = m;
	323	}
	324
	325	hd_flush (ifp)
	326	struct ifnet *ifp;
	327	{
	328	register struct mbuf *m;
	329	register int s;
	330
	331	while (1) {
42963956	332	s = splimp ();
edc74019 KS	333	IF_DEQUEUE (&ifp->if_snd, m);
	334	splx (s);
	335	if (m == 0)
	336	break;
	337	m_freem (m);
	338	}
	339	}
	340
	341	hd_message (hdp, msg)
	342	struct hdcb *hdp;
	343	char *msg;
	344	{
	345	char *format_ntn ();
	346
	347	if (hdcbhead -> hd_next)
	348	printf ("HDLC(%s): %s\n", format_ntn (hdp->hd_xcp), msg);
	349	else
	350	printf ("HDLC: %s\n", msg);
	351	}
	352
	353	#ifdef HDLCDEBUG
	354	hd_status (hdp)
	355	struct hdcb *hdp;
	356	{
	357	printf ("HDLC STATUS:\n V(S)=%d, V(R)=%d, retxqi=%d,\n",
	358	hdp->hd_vs, hdp->hd_vr, hdp->hd_retxqi);
	359
	360	printf ("Last_rx_nr=%d, Last_tx_nr=%d,\n Condition=%d, Xx=%d\n",
	361	hdp->hd_lastrxnr, hdp->hd_lasttxnr, hdp->hd_condition, hdp->hd_xx);
	362	}
	363	#endif