[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	7.7 (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 =
			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);
}

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	*
5548a02f	12	* @(#)hd_subr.c 7.7 (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 KS	66	hdp->hd_pkp =
	67	pk_newlink ((struct x25_ifaddr *)ifa, (caddr_t)hdp);
	68	if (hdp -> hd_pkp == 0) {
	69	free(hdp, M_PCB);
	70	return (ENOBUFS);
edc74019	71	}
42963956 KS	72	hdp->hd_ifp = ifp;
	73	hdp->hd_ifa = ifa;
	74	hdp->hd_xcp = xcp;
edc74019	75	hdp->hd_state = INIT;
42963956	76	hdp->hd_output = hd_ifoutput;
315951e8 KS	77	hdp->hd_next = hdcbhead;
315951e8 KS	78	hdcbhead = hdp;
edc74019 KS	79	}
	80
	81	switch (prc) {
	82	case PRC_IFUP:
	83	if (xcp->xc_lwsize == 0 \|\|
	84	xcp->xc_lwsize > MAX_WINDOW_SIZE)
	85	xcp->xc_lwsize = MAX_WINDOW_SIZE;
	86	if (hdp->hd_state == INIT)
	87	SET_TIMER (hdp);
	88	break;
	89
	90	case PRC_IFDOWN:
	91	if (hdp->hd_state == ABM)
	92	hd_message (hdp, "Operator shutdown: link closed");
315951e8	93	(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
edc74019 KS	94	hd_writeinternal (hdp, DISC, POLLON);
	95	hdp->hd_state = DISC_SENT;
	96	SET_TIMER (hdp);
	97	}
	98	return (0);
	99	}
	100
	101	hd_initvars (hdp)
	102	register struct hdcb *hdp;
	103	{
	104	register struct mbuf *m;
	105	register int i;
	106
	107	/* Clear Transmit queue. */
	108	while ((m = hd_remove (&hdp->hd_txq)) != NULL)
	109	m_freem (m);
	110
	111	/* Clear Retransmit queue. */
	112	i = hdp->hd_lastrxnr;
	113	while (i != hdp->hd_retxqi) {
	114	m_freem (hdp->hd_retxq[i]);
	115	i = (i + 1) % MODULUS;
	116	}
	117	hdp->hd_retxqi = 0;
	118
	119	hdp->hd_vs = hdp->hd_vr = 0;
	120	hdp->hd_lasttxnr = hdp->hd_lastrxnr = 0;
	121	hdp->hd_rrtimer = 0;
	122	KILL_TIMER(hdp);
	123	hdp->hd_retxcnt = 0;
	124	hdp->hd_condition = 0;
	125	}
	126
	127	hd_decode (hdp, frame)
	128	register struct hdcb *hdp;
	129	struct Hdlc_frame *frame;
	130	{
	131	register int frametype = ILLEGAL;
	132	register struct Hdlc_iframe iframe = (struct Hdlc_iframe ) frame;
	133	register struct Hdlc_sframe sframe = (struct Hdlc_sframe ) frame;
	134	register struct Hdlc_uframe uframe = (struct Hdlc_uframe ) frame;
	135
	136	if (iframe -> hdlc_0 == 0) {
	137	frametype = IFRAME;
	138	hdp->hd_iframes_in++;
	139	}
	140
	141	else if (sframe -> hdlc_01 == 1) {
	142	/* Supervisory format. */
	143	switch (sframe -> s2) {
	144	case 0:
	145	frametype = RR;
	146	hdp->hd_rrs_in++;
	147	break;
	148
	149	case 1:
	150	frametype = RNR;
	151	hdp->hd_rnrs_in++;
	152	break;
	153
	154	case 2:
	155	frametype = REJ;
	156	hdp->hd_rejs_in++;
	157	}
158	}
159	else if (uframe -> hdlc_11 == 3) {
160	/* Unnumbered format. */
161	switch (uframe -> m3) {
162	case 0:
163	frametype = DM;
164	break;
165
166	case 1:
167	frametype = SABM;
168	break;
169
170	case 2:
171	frametype = DISC;
172	break;
173
174	case 3:
175	frametype = UA;
176	break;
177
178	case 4:
179	frametype = FRMR;
180	hdp->hd_frmrs_in++;
181	}
182	}
183	return (frametype);
184	}
185
186	/*
187	* This routine is called when the HDLC layer internally generates a
188	* command or response for the remote machine ( eg. RR, UA etc. ).
189	* Only supervisory or unnumbered frames are processed.
190	*/
191
192	hd_writeinternal (hdp, frametype, pf)
193	register struct hdcb *hdp;
194	register int frametype, pf;
195	{
196	register struct mbuf *buf;
197	struct Hdlc_frame *frame;
198	register struct Hdlc_sframe *sframe;
199	register struct Hdlc_uframe *uframe;
200
42963956	201	MGETHDR (buf, M_DONTWAIT, MT_HEADER);
edc74019 KS	202	if (buf == 0)
	203	return;
	204	frame = mtod (buf, struct Hdlc_frame *);
	205	sframe = mtod (buf, struct Hdlc_sframe *);
	206	uframe = mtod (buf, struct Hdlc_uframe *);
	207
	208	/* Assume a response - address structure for DTE */
	209	frame -> address = ADDRESS_A;
	210	buf -> m_len = 2;
	211	buf -> m_act = buf -> m_next = NULL;
	212
	213	switch (frametype) {
	214	case RR:
	215	frame -> control = RR_CONTROL;
	216	hdp->hd_rrs_out++;
	217	break;
	218
	219	case RNR:
	220	frame -> control = RNR_CONTROL;
	221	hdp->hd_rnrs_out++;
	222	break;
	223
	224	case REJ:
	225	frame -> control = REJ_CONTROL;
	226	hdp->hd_rejs_out++;
	227	break;
	228
	229	case SABM:
	230	frame -> control = SABM_CONTROL;
	231	frame -> address = ADDRESS_B;
	232	break;
	233
	234	case DISC:
42963956 KS	235	if ((hdp->hd_ifp->if_flags & IFF_UP) == 0) {
	236	hdp->hd_state = DISCONNECTED;
	237	(void) m_freem (buf);
	238	hd_flush (hdp->hd_ifp);
	239	return;
	240	}
edc74019 KS	241	frame -> control = DISC_CONTROL;
	242	frame -> address = ADDRESS_B;
	243	break;
	244
	245	case DM:
	246	frame -> control = DM_CONTROL;
	247	break;
	248
	249	case UA:
	250	frame -> control = UA_CONTROL;
	251	break;
	252
	253	case FRMR:
	254	frame -> control = FRMR_CONTROL;
	255	bcopy ((caddr_t)&hd_frmr, (caddr_t)frame -> info, 3);
	256	buf -> m_len = 5;
	257	hdp->hd_frmrs_out++;
	258
	259	}
	260
	261	if (sframe -> hdlc_01 == 1) {
	262	/* Supervisory format - RR, REJ, or RNR. */
	263	sframe -> nr = hdp->hd_vr;
	264	sframe -> pf = pf;
	265	hdp->hd_lasttxnr = hdp->hd_vr;
	266	hdp->hd_rrtimer = 0;
	267	}
	268	else
	269	uframe -> pf = pf;
	270
	271	hd_trace (hdp, TX, frame);
42963956 KS	272	buf -> m_pkthdr.len = buf -> m_len;
42963956 KS	273	(*hdp->hd_output) (hdp, buf);
edc74019 KS	274	}
	275
	276	struct mbuf *
	277	hd_remove (q)
	278	struct hdtxq *q;
	279	{
	280	register struct mbuf *m;
	281
	282	m = q -> head;
	283	if (m) {
	284	if ((q -> head = m -> m_act) == NULL)
	285	q -> tail = NULL;
	286	m -> m_act = 0;
	287	}
	288	return (m);
	289	}
	290
	291	hd_append (q, m)
	292	register struct hdtxq *q;
	293	register struct mbuf *m;
	294	{
	295
	296	m -> m_act = NULL;
	297	if (q -> tail == NULL)
	298	q -> head = m;
	299	else
	300	q -> tail -> m_act = m;
	301	q -> tail = m;
	302	}
	303
	304	hd_flush (ifp)
	305	struct ifnet *ifp;
	306	{
	307	register struct mbuf *m;
	308	register int s;
	309
	310	while (1) {
42963956	311	s = splimp ();
edc74019 KS	312	IF_DEQUEUE (&ifp->if_snd, m);
	313	splx (s);
	314	if (m == 0)
	315	break;
	316	m_freem (m);
	317	}
	318	}
	319
	320	hd_message (hdp, msg)
	321	struct hdcb *hdp;
	322	char *msg;
	323	{
	324	char *format_ntn ();
	325
	326	if (hdcbhead -> hd_next)
	327	printf ("HDLC(%s): %s\n", format_ntn (hdp->hd_xcp), msg);
	328	else
	329	printf ("HDLC: %s\n", msg);
	330	}
	331
	332	#ifdef HDLCDEBUG
	333	hd_status (hdp)
	334	struct hdcb *hdp;
	335	{
	336	printf ("HDLC STATUS:\n V(S)=%d, V(R)=%d, retxqi=%d,\n",
	337	hdp->hd_vs, hdp->hd_vr, hdp->hd_retxqi);
	338
	339	printf ("Last_rx_nr=%d, Last_tx_nr=%d,\n Condition=%d, Xx=%d\n",
	340	hdp->hd_lastrxnr, hdp->hd_lasttxnr, hdp->hd_condition, hdp->hd_xx);
	341	}
	342	#endif