[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	7.9 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/socket.h>
#include <sys/socketvar.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>
#include <netccitt/pk_var.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	*
d4011a6b	12	* @(#)hd_subr.c 7.9 (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>
d4011a6b	20	#include <sys/socketvar.h>
5548a02f KB	21	#include <sys/protosw.h>
	22	#include <sys/errno.h>
	23	#include <sys/time.h>
	24	#include <sys/kernel.h>
edc74019	25
5548a02f	26	#include <net/if.h>
edc74019	27
5548a02f KB	28	#include <netccitt/hdlc.h>
	29	#include <netccitt/hd_var.h>
	30	#include <netccitt/x25.h>
d4011a6b	31	#include <netccitt/pk_var.h>
edc74019 KS	32
	33	hd_init ()
	34	{
	35
	36	hdintrq.ifq_maxlen = IFQ_MAXLEN;
	37	}
	38
	39	hd_ctlinput (prc, addr)
42963956	40	struct sockaddr *addr;
edc74019 KS	41	{
edc74019 KS	42	register struct x25config xcp = (struct x25config )addr;
edc74019 KS	43	register struct hdcb *hdp;
edc74019 KS	44	register struct ifaddr *ifa;
42963956	45	struct ifnet *ifp;
315951e8	46	caddr_t pk_newlink();
edc74019	47
42963956	48	if (addr->sa_family != AF_CCITT)
edc74019 KS	49	return (EAFNOSUPPORT);
	50	if (xcp->xc_lptype != HDLCPROTO_LAPB)
	51	return (EPROTONOSUPPORT);
42963956 KS	52	ifa = ifa_ifwithaddr(addr);
	53	if (ifa == 0 \|\| ifa->ifa_addr->sa_family != AF_CCITT \|\|
	54	(ifp = ifa->ifa_ifp) == 0)
edc74019 KS	55	panic ("hd_ctlinput");
	56	for (hdp = hdcbhead; hdp; hdp = hdp->hd_next)
	57	if (hdp->hd_ifp == ifp)
	58	break;
	59
	60	if (hdp == 0) { /* new interface */
42963956	61	int error, hd_ifoutput(), hd_output();
edc74019	62
42963956 KS	63	/* an hdcb is now too big to fit in an mbuf */
	64	MALLOC(hdp, struct hdcb , sizeof (hdp), M_PCB, M_DONTWAIT);
	65	if (hdp == 0)
edc74019	66	return (ENOBUFS);
42963956	67	bzero((caddr_t)hdp, sizeof(*hdp));
315951e8	68	hdp->hd_pkp =
dfa4fd4b KS	69	(caddr_t) pk_newlink ((struct x25_ifaddr *) ifa,
	70	(caddr_t) hdp);
	71	((struct x25_ifaddr *)ifa)->ia_pkcb =
	72	(struct pkcb *) hdp->hd_pkp;
315951e8 KS	73	if (hdp -> hd_pkp == 0) {
	74	free(hdp, M_PCB);
	75	return (ENOBUFS);
edc74019	76	}
42963956 KS	77	hdp->hd_ifp = ifp;
	78	hdp->hd_ifa = ifa;
	79	hdp->hd_xcp = xcp;
edc74019	80	hdp->hd_state = INIT;
42963956	81	hdp->hd_output = hd_ifoutput;
315951e8 KS	82	hdp->hd_next = hdcbhead;
315951e8 KS	83	hdcbhead = hdp;
dfa4fd4b KS	84	} else if (hdp->hd_pkp == 0) { /* interface got reconfigured */
	85	hdp->hd_pkp =
	86	(caddr_t) pk_newlink ((struct x25_ifaddr *) ifa,
	87	(caddr_t) hdp);
	88	((struct x25_ifaddr *)ifa)->ia_pkcb =
	89	(struct pkcb *) hdp->hd_pkp;
	90	if (hdp -> hd_pkp == 0) {
	91	free(hdp, M_PCB);
	92	return (ENOBUFS);
	93	}
edc74019 KS	94	}
	95
	96	switch (prc) {
	97	case PRC_IFUP:
	98	if (xcp->xc_lwsize == 0 \|\|
	99	xcp->xc_lwsize > MAX_WINDOW_SIZE)
	100	xcp->xc_lwsize = MAX_WINDOW_SIZE;
	101	if (hdp->hd_state == INIT)
	102	SET_TIMER (hdp);
	103	break;
	104
	105	case PRC_IFDOWN:
	106	if (hdp->hd_state == ABM)
	107	hd_message (hdp, "Operator shutdown: link closed");
315951e8	108	(void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
dfa4fd4b KS	109
	110	/* fall thru to ... */
	111
	112	case PRC_DISCONNECT_REQUEST:
	113	/* drop reference to pkcb --- it's dead meat */
	114	hdp->hd_pkp = (caddr_t) 0;
	115	((struct x25_ifaddr )ifa)->ia_pkcb = (struct pkcb ) 0;
	116
edc74019 KS	117	hd_writeinternal (hdp, DISC, POLLON);
	118	hdp->hd_state = DISC_SENT;
	119	SET_TIMER (hdp);
	120	}
	121	return (0);
	122	}
	123
	124	hd_initvars (hdp)
	125	register struct hdcb *hdp;
	126	{
	127	register struct mbuf *m;
	128	register int i;
	129
	130	/* Clear Transmit queue. */
	131	while ((m = hd_remove (&hdp->hd_txq)) != NULL)
	132	m_freem (m);
	133
	134	/* Clear Retransmit queue. */
	135	i = hdp->hd_lastrxnr;
	136	while (i != hdp->hd_retxqi) {
	137	m_freem (hdp->hd_retxq[i]);
	138	i = (i + 1) % MODULUS;
	139	}
	140	hdp->hd_retxqi = 0;
	141
	142	hdp->hd_vs = hdp->hd_vr = 0;
	143	hdp->hd_lasttxnr = hdp->hd_lastrxnr = 0;
	144	hdp->hd_rrtimer = 0;
	145	KILL_TIMER(hdp);
	146	hdp->hd_retxcnt = 0;
	147	hdp->hd_condition = 0;
	148	}
	149
	150	hd_decode (hdp, frame)
	151	register struct hdcb *hdp;
	152	struct Hdlc_frame *frame;
	153	{
	154	register int frametype = ILLEGAL;
	155	register struct Hdlc_iframe iframe = (struct Hdlc_iframe ) frame;
	156	register struct Hdlc_sframe sframe = (struct Hdlc_sframe ) frame;
	157	register struct Hdlc_uframe uframe = (struct Hdlc_uframe ) frame;
	158
	159	if (iframe -> hdlc_0 == 0) {
	160	frametype = IFRAME;
	161	hdp->hd_iframes_in++;
	162	}
	163
	164	else if (sframe -> hdlc_01 == 1) {
	165	/* Supervisory format. */
	166	switch (sframe -> s2) {
	167	case 0:
	168	frametype = RR;
	169	hdp->hd_rrs_in++;
	170	break;
	171
	172	case 1:
	173	frametype = RNR;
	174	hdp->hd_rnrs_in++;
	175	break;
	176
	177	case 2:
	178	frametype = REJ;
	179	hdp->hd_rejs_in++;
	180	}
181	}
182	else if (uframe -> hdlc_11 == 3) {
183	/* Unnumbered format. */
184	switch (uframe -> m3) {
185	case 0:
186	frametype = DM;
187	break;
188
189	case 1:
190	frametype = SABM;
191	break;
192
193	case 2:
194	frametype = DISC;
195	break;
196
197	case 3:
198	frametype = UA;
199	break;
200
201	case 4:
202	frametype = FRMR;
203	hdp->hd_frmrs_in++;
204	}
205	}
206	return (frametype);
207	}
208
209	/*
210	* This routine is called when the HDLC layer internally generates a
211	* command or response for the remote machine ( eg. RR, UA etc. ).
212	* Only supervisory or unnumbered frames are processed.
213	*/
214
215	hd_writeinternal (hdp, frametype, pf)
216	register struct hdcb *hdp;
217	register int frametype, pf;
218	{
219	register struct mbuf *buf;
220	struct Hdlc_frame *frame;
221	register struct Hdlc_sframe *sframe;
222	register struct Hdlc_uframe *uframe;
223
42963956	224	MGETHDR (buf, M_DONTWAIT, MT_HEADER);
edc74019 KS	225	if (buf == 0)
	226	return;
	227	frame = mtod (buf, struct Hdlc_frame *);
	228	sframe = mtod (buf, struct Hdlc_sframe *);
	229	uframe = mtod (buf, struct Hdlc_uframe *);
	230
	231	/* Assume a response - address structure for DTE */
	232	frame -> address = ADDRESS_A;
	233	buf -> m_len = 2;
	234	buf -> m_act = buf -> m_next = NULL;
	235
	236	switch (frametype) {
	237	case RR:
	238	frame -> control = RR_CONTROL;
	239	hdp->hd_rrs_out++;
	240	break;
	241
	242	case RNR:
	243	frame -> control = RNR_CONTROL;
	244	hdp->hd_rnrs_out++;
	245	break;
	246
	247	case REJ:
	248	frame -> control = REJ_CONTROL;
	249	hdp->hd_rejs_out++;
	250	break;
	251
	252	case SABM:
	253	frame -> control = SABM_CONTROL;
	254	frame -> address = ADDRESS_B;
	255	break;
	256
	257	case DISC:
42963956 KS	258	if ((hdp->hd_ifp->if_flags & IFF_UP) == 0) {
	259	hdp->hd_state = DISCONNECTED;
	260	(void) m_freem (buf);
	261	hd_flush (hdp->hd_ifp);
	262	return;
	263	}
edc74019 KS	264	frame -> control = DISC_CONTROL;
	265	frame -> address = ADDRESS_B;
	266	break;
	267
	268	case DM:
	269	frame -> control = DM_CONTROL;
	270	break;
	271
	272	case UA:
	273	frame -> control = UA_CONTROL;
	274	break;
	275
	276	case FRMR:
	277	frame -> control = FRMR_CONTROL;
	278	bcopy ((caddr_t)&hd_frmr, (caddr_t)frame -> info, 3);
	279	buf -> m_len = 5;
	280	hdp->hd_frmrs_out++;
	281
	282	}
	283
	284	if (sframe -> hdlc_01 == 1) {
	285	/* Supervisory format - RR, REJ, or RNR. */
	286	sframe -> nr = hdp->hd_vr;
	287	sframe -> pf = pf;
	288	hdp->hd_lasttxnr = hdp->hd_vr;
	289	hdp->hd_rrtimer = 0;
	290	}
	291	else
	292	uframe -> pf = pf;
	293
	294	hd_trace (hdp, TX, frame);
42963956 KS	295	buf -> m_pkthdr.len = buf -> m_len;
42963956 KS	296	(*hdp->hd_output) (hdp, buf);
edc74019 KS	297	}
	298
	299	struct mbuf *
	300	hd_remove (q)
	301	struct hdtxq *q;
	302	{
	303	register struct mbuf *m;
	304
	305	m = q -> head;
	306	if (m) {
	307	if ((q -> head = m -> m_act) == NULL)
	308	q -> tail = NULL;
	309	m -> m_act = 0;
	310	}
	311	return (m);
	312	}
	313
	314	hd_append (q, m)
	315	register struct hdtxq *q;
	316	register struct mbuf *m;
	317	{
	318
	319	m -> m_act = NULL;
	320	if (q -> tail == NULL)
	321	q -> head = m;
	322	else
	323	q -> tail -> m_act = m;
	324	q -> tail = m;
	325	}
	326
	327	hd_flush (ifp)
	328	struct ifnet *ifp;
	329	{
	330	register struct mbuf *m;
	331	register int s;
	332
	333	while (1) {
42963956	334	s = splimp ();
edc74019 KS	335	IF_DEQUEUE (&ifp->if_snd, m);
	336	splx (s);
	337	if (m == 0)
	338	break;
	339	m_freem (m);
	340	}
	341	}
	342
	343	hd_message (hdp, msg)
	344	struct hdcb *hdp;
	345	char *msg;
	346	{
	347	char *format_ntn ();
	348
	349	if (hdcbhead -> hd_next)
	350	printf ("HDLC(%s): %s\n", format_ntn (hdp->hd_xcp), msg);
	351	else
	352	printf ("HDLC: %s\n", msg);
	353	}
	354
	355	#ifdef HDLCDEBUG
	356	hd_status (hdp)
	357	struct hdcb *hdp;
	358	{
	359	printf ("HDLC STATUS:\n V(S)=%d, V(R)=%d, retxqi=%d,\n",
	360	hdp->hd_vs, hdp->hd_vr, hdp->hd_retxqi);
	361
	362	printf ("Last_rx_nr=%d, Last_tx_nr=%d,\n Condition=%d, Xx=%d\n",
	363	hdp->hd_lastrxnr, hdp->hd_lasttxnr, hdp->hd_condition, hdp->hd_xx);
	364	}
	365	#endif