xref: /csrg-svn/sys/netiso/tp_pcb.c (revision 51204)

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)tp_pcb.c	7.18 (Berkeley) 09/26/91
 */

/***********************************************************
				Copyright IBM Corporation 1987

                      All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of IBM not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/

/*
 * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
 */
/*
 * ARGO TP
 *
 * $Header: tp_pcb.c,v 5.4 88/11/18 17:28:24 nhall Exp $
 * $Source: /usr/argo/sys/netiso/RCS/tp_pcb.c,v $
 *
 *
 * This is the initialization and cleanup stuff -
 * for the tp machine in general as well as  for the individual pcbs.
 * tp_init() is called at system startup.  tp_attach() and tp_getref() are
 * called when a socket is created.  tp_detach() and tp_freeref()
 * are called during the closing stage and/or when the reference timer
 * goes off.
 * tp_soisdisconnecting() and tp_soisdisconnected() are tp-specific
 * versions of soisconnect*
 * and are called (obviously) during the closing phase.
 *
 */

#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "socket.h"
#include "socketvar.h"
#include "domain.h"
#include "protosw.h"
#include "errno.h"
#include "time.h"
#include "argo_debug.h"
#include "tp_param.h"
#include "tp_timer.h"
#include "tp_ip.h"
#include "tp_stat.h"
#include "tp_pcb.h"
#include "tp_tpdu.h"
#include "tp_trace.h"
#include "tp_meas.h"
#include "tp_seq.h"
#include "tp_clnp.h"

struct tp_param tp_param = {
	1,				/*  configured 		*/
};

/* ticks are in units of:
 * 500 nano-fortnights ;-) or
 * 500 ms or
 * 1/2 second
 */

struct tp_conn_param tp_conn_param[] = {
	/* ISO_CLNS: TP4 CONNECTION LESS */
	{
		TP_NRETRANS, 	/* short p_Nretrans;  */
		20,		/* 10 sec */ 	/* short p_dr_ticks;  */

		20,		/* 10 sec */ 	/* short p_cc_ticks; */
		20,		/* 10 sec */ 	/* short p_dt_ticks; */

		40,		/* 20 sec */ 	/* short p_x_ticks;	 */
		80,		/* 40 sec */ 	/* short p_cr_ticks;*/

		240,	/* 2 min */ 	/* short p_keepalive_ticks;*/
		10,		/* 5 sec */ 	/* short p_sendack_ticks;  */

		600,	/* 5 min */ 	/* short p_ref_ticks;	*/
		360,	/* 3 min */ 	/* short p_inact_ticks;	*/

		(short) 100, 			/* short p_lcdtfract */
		(short) TP_SOCKBUFSIZE,	/* short p_winsize */
		TP_TPDUSIZE, 			/* u_char p_tpdusize */

		TPACK_WINDOW, 			/* 4 bits p_ack_strat */
		TPRX_USE_CW | TPRX_FASTSTART,
								/* 4 bits p_rx_strat*/
		TP_CLASS_4 | TP_CLASS_0,/* 5 bits p_class */
		1,						/* 1 bit xtd format */
		1,						/* 1 bit xpd service */
		1,						/* 1 bit use_checksum */
		0,						/* 1 bit use net xpd */
		0,						/* 1 bit use rcc */
		0,						/* 1 bit use efc */
		1,						/* no disc indications */
		0,						/* don't change params */
		ISO_CLNS,				/* p_netservice */
	},
	/* IN_CLNS: TP4 CONNECTION LESS */
	{
		TP_NRETRANS, 	/* short p_Nretrans;  */
		20,		/* 10 sec */ 	/* short p_dr_ticks;  */

		20,		/* 10 sec */ 	/* short p_cc_ticks; */
		20,		/* 10 sec */ 	/* short p_dt_ticks; */

		40,		/* 20 sec */ 	/* short p_x_ticks;	 */
		80,		/* 40 sec */ 	/* short p_cr_ticks;*/

		240,	/* 2 min */ 	/* short p_keepalive_ticks;*/
		10,		/* 5 sec */ 	/* short p_sendack_ticks;  */

		600,	/* 5 min */ 	/* short p_ref_ticks;	*/
		360,	/* 3 min */ 	/* short p_inact_ticks;	*/

		(short) 100, 			/* short p_lcdtfract */
		(short) TP_SOCKBUFSIZE,	/* short p_winsize */
		TP_TPDUSIZE, 			/* u_char p_tpdusize */

		TPACK_WINDOW, 			/* 4 bits p_ack_strat */
		TPRX_USE_CW | TPRX_FASTSTART,
								/* 4 bits p_rx_strat*/
		TP_CLASS_4,				/* 5 bits p_class */
		1,						/* 1 bit xtd format */
		1,						/* 1 bit xpd service */
		1,						/* 1 bit use_checksum */
		0,						/* 1 bit use net xpd */
		0,						/* 1 bit use rcc */
		0,						/* 1 bit use efc */
		1,						/* no disc indications */
		0,						/* don't change params */
		IN_CLNS,				/* p_netservice */
	},
	/* ISO_CONS: TP0 CONNECTION MODE */
	{
		TP_NRETRANS, 			/* short p_Nretrans;  */
		0,		/* n/a */		/* short p_dr_ticks; */

		40,		/* 20 sec */	/* short p_cc_ticks; */
		0,		/* n/a */		/* short p_dt_ticks; */

		0,		/* n/a */		/* short p_x_ticks;	*/
		360,	/* 3  min */	/* short p_cr_ticks;*/

		0,		/* n/a */		/* short p_keepalive_ticks;*/
		0,		/* n/a */		/* short p_sendack_ticks; */

		600,	/* for cr/cc to clear *//* short p_ref_ticks;	*/
		0,		/* n/a */		/* short p_inact_ticks;	*/

		/* Use tp4 defaults just in case the user changes ONLY
		 * the class
		 */
		(short) 100, 			/* short p_lcdtfract */
		(short) TP0_SOCKBUFSIZE,	/* short p_winsize */
		TP0_TPDUSIZE, 			/* 8 bits p_tpdusize */

		0, 						/* 4 bits p_ack_strat */
		0, 						/* 4 bits p_rx_strat*/
		TP_CLASS_0,				/* 5 bits p_class */
		0,						/* 1 bit xtd format */
		0,						/* 1 bit xpd service */
		0,						/* 1 bit use_checksum */
		0,						/* 1 bit use net xpd */
		0,						/* 1 bit use rcc */
		0,						/* 1 bit use efc */
		0,						/* no disc indications */
		0,						/* don't change params */
		ISO_CONS,				/* p_netservice */
	},
	/* ISO_COSNS: TP4 CONNECTION LESS SERVICE over CONSNS */
	{
		TP_NRETRANS, 	/* short p_Nretrans;  */
		40,		/* 20 sec */ 	/* short p_dr_ticks;  */

		40,		/* 20 sec */ 	/* short p_cc_ticks; */
		80,		/* 40 sec */ 	/* short p_dt_ticks; */

		120,		/* 1 min */ 	/* short p_x_ticks;	 */
		360,		/* 3 min */ 	/* short p_cr_ticks;*/

		360,	/* 3 min */ 	/* short p_keepalive_ticks;*/
		20,		/* 10 sec */ 	/* short p_sendack_ticks;  */

		600,	/* 5 min */ 	/* short p_ref_ticks;	*/
		480,	/* 4 min */ 	/* short p_inact_ticks;	*/

		(short) 100, 			/* short p_lcdtfract */
		(short) TP0_SOCKBUFSIZE,	/* short p_winsize */
		TP0_TPDUSIZE, 			/* u_char p_tpdusize */

		TPACK_WINDOW, 			/* 4 bits p_ack_strat */
		TPRX_USE_CW ,			/* No fast start */
								/* 4 bits p_rx_strat*/
		TP_CLASS_4 | TP_CLASS_0,/* 5 bits p_class */
		0,						/* 1 bit xtd format */
		1,						/* 1 bit xpd service */
		1,						/* 1 bit use_checksum */
		0,						/* 1 bit use net xpd */
		0,						/* 1 bit use rcc */
		0,						/* 1 bit use efc */
		0,						/* no disc indications */
		0,						/* don't change params */
		ISO_COSNS,				/* p_netservice */
	},
};

#ifdef INET
int		in_putnetaddr();
int		in_getnetaddr();
int		in_cmpnetaddr();
int 	in_putsufx();
int 	in_getsufx();
int 	in_recycle_tsuffix();
int 	tpip_mtu();
int 	in_pcbbind();
int 	in_pcbconnect();
int 	in_pcbdisconnect();
int 	in_pcbdetach();
int 	in_pcballoc();
int 	tpip_output();
int 	tpip_output_dg();
struct inpcb	tp_inpcb;
#endif INET
#ifdef ISO
int		iso_putnetaddr();
int		iso_getnetaddr();
int		iso_cmpnetaddr();
int 	iso_putsufx();
int 	iso_getsufx();
int 	iso_recycle_tsuffix();
int		tpclnp_mtu();
int		iso_pcbbind();
int		iso_pcbconnect();
int		iso_pcbdisconnect();
int 	iso_pcbdetach();
int 	iso_pcballoc();
int 	tpclnp_output();
int 	tpclnp_output_dg();
int		iso_nlctloutput();
struct isopcb	tp_isopcb;
#endif ISO
#ifdef TPCONS
int		iso_putnetaddr();
int		iso_getnetaddr();
int		iso_cmpnetaddr();
int 	iso_putsufx();
int 	iso_getsufx();
int 	iso_recycle_tsuffix();
int		iso_pcbbind();
int		tpcons_pcbconnect();
int		tpclnp_mtu();
int		iso_pcbdisconnect();
int 	iso_pcbdetach();
int 	iso_pcballoc();
int 	tpcons_output();
struct isopcb	tp_isopcb;
#endif TPCONS


struct nl_protosw nl_protosw[] = {
	/* ISO_CLNS */
#ifdef ISO
	{ AF_ISO, iso_putnetaddr, iso_getnetaddr, iso_cmpnetaddr,
		iso_putsufx, iso_getsufx,
		iso_recycle_tsuffix,
		tpclnp_mtu, iso_pcbbind, iso_pcbconnect,
		iso_pcbdisconnect,	iso_pcbdetach,
		iso_pcballoc,
		tpclnp_output, tpclnp_output_dg, iso_nlctloutput,
		(caddr_t) &tp_isopcb,
		},
#else
	{ 0 },
#endif ISO
	/* IN_CLNS */
#ifdef INET
	{ AF_INET, in_putnetaddr, in_getnetaddr, in_cmpnetaddr,
		in_putsufx, in_getsufx,
		in_recycle_tsuffix,
		tpip_mtu, in_pcbbind, in_pcbconnect,
		in_pcbdisconnect,	in_pcbdetach,
		in_pcballoc,
		tpip_output, tpip_output_dg, /* nl_ctloutput */ NULL,
		(caddr_t) &tp_inpcb,
		},
#else
	{ 0 },
#endif INET
	/* ISO_CONS */
#if defined(ISO) && defined(TPCONS)
	{ AF_ISO, iso_putnetaddr, iso_getnetaddr, iso_cmpnetaddr,
		iso_putsufx, iso_getsufx,
		iso_recycle_tsuffix,
		tpclnp_mtu, iso_pcbbind, tpcons_pcbconnect,
		iso_pcbdisconnect,	iso_pcbdetach,
		iso_pcballoc,
		tpcons_output, tpcons_output, iso_nlctloutput,
		(caddr_t) &tp_isopcb,
		},
#else
	{ 0 },
#endif ISO_CONS
	/* End of protosw marker */
	{ 0 }
};

/*
 * NAME:  tp_init()
 *
 * CALLED FROM:
 *  autoconf through the protosw structure
 *
 * FUNCTION:
 *  initialize tp machine
 *
 * RETURNS:  Nada
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 */
int
tp_init()
{
	static int 	init_done=0;
	void	 	tp_timerinit();

	if (init_done++)
		return 0;


	/* FOR INET */
	tp_inpcb.inp_next = tp_inpcb.inp_prev = &tp_inpcb;
	/* FOR ISO */
	tp_isopcb.isop_next = tp_isopcb.isop_prev = &tp_isopcb;

    tp_start_win = 2;

	tp_timerinit();
	bzero((caddr_t)&tp_stat, sizeof(struct tp_stat));
	return 0;
}

/*
 * NAME: 	tp_soisdisconnecting()
 *
 * CALLED FROM:
 *  tp.trans
 *
 * FUNCTION and ARGUMENTS:
 *  Set state of the socket (so) to reflect that fact that we're disconnectING
 *
 * RETURNS: 	Nada
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 *  This differs from the regular soisdisconnecting() in that the latter
 *  also sets the SS_CANTRECVMORE and SS_CANTSENDMORE flags.
 *  We don't want to set those flags because those flags will cause
 *  a SIGPIPE to be delivered in sosend() and we don't like that.
 *  If anyone else is sleeping on this socket, wake 'em up.
 */
void
tp_soisdisconnecting(so)
	register struct socket *so;
{
	soisdisconnecting(so);
	so->so_state &= ~SS_CANTSENDMORE;
	IFPERF(sototpcb(so))
		register struct tp_pcb *tpcb = sototpcb(so);
		u_int 	fsufx, lsufx;

		bcopy ((caddr_t)tpcb->tp_fsuffix, (caddr_t)&fsufx, sizeof(u_int) );
		bcopy ((caddr_t)tpcb->tp_lsuffix, (caddr_t)&lsufx, sizeof(u_int) );

		tpmeas(tpcb->tp_lref, TPtime_close, &time, fsufx, lsufx, tpcb->tp_fref);
		tpcb->tp_perf_on = 0; /* turn perf off */
	ENDPERF
}


/*
 * NAME: tp_soisdisconnected()
 *
 * CALLED FROM:
 *	tp.trans
 *
 * FUNCTION and ARGUMENTS:
 *  Set state of the socket (so) to reflect that fact that we're disconnectED
 *  Set the state of the reference structure to closed, and
 *  recycle the suffix.
 *  Start a reference timer.
 *
 * RETURNS:	Nada
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 *  This differs from the regular soisdisconnected() in that the latter
 *  also sets the SS_CANTRECVMORE and SS_CANTSENDMORE flags.
 *  We don't want to set those flags because those flags will cause
 *  a SIGPIPE to be delivered in sosend() and we don't like that.
 *  If anyone else is sleeping on this socket, wake 'em up.
 */
void
tp_soisdisconnected(tpcb)
	register struct tp_pcb	*tpcb;
{
	register struct socket	*so = tpcb->tp_sock;

	soisdisconnecting(so);
	so->so_state &= ~SS_CANTSENDMORE;
	IFPERF(tpcb)
		register struct tp_pcb *ttpcb = sototpcb(so);
		u_int 	fsufx, lsufx;

		/* CHOKE */
		bcopy ((caddr_t)ttpcb->tp_fsuffix, (caddr_t)&fsufx, sizeof(u_int) );
		bcopy ((caddr_t)ttpcb->tp_lsuffix, (caddr_t)&lsufx, sizeof(u_int) );

		tpmeas(ttpcb->tp_lref, TPtime_close,
		   &time, &lsufx, &fsufx, ttpcb->tp_fref);
		tpcb->tp_perf_on = 0; /* turn perf off */
	ENDPERF

	tpcb->tp_refstate = REF_FROZEN;
	tp_recycle_tsuffix(tpcb);
	tp_etimeout(tpcb, TM_reference, (int)tpcb->tp_refer_ticks);
}

/*
 * NAME:	tp_freeref()
 *
 * CALLED FROM:
 *  tp.trans when the reference timer goes off, and
 *  from tp_attach() and tp_detach() when a tpcb is partially set up but not
 *  set up enough to have a ref timer set for it, and it's discarded
 *  due to some sort of error or an early close()
 *
 * FUNCTION and ARGUMENTS:
 *  Frees the reference represented by (r) for re-use.
 *
 * RETURNS: Nothing
 *
 * SIDE EFFECTS:
 *
 * NOTES:	better be called at clock priority !!!!!
 */
void
tp_freeref(r)
	register struct tp_ref *r;
{
	register struct tp_pcb *tpcb = r->tpr_pcb;
	IFDEBUG(D_TIMER)
		printf("tp_freeref called for ref %d maxrefopen %d\n",
		r - tp_ref, tp_refinfo.tpr_maxopen);
	ENDDEBUG
	IFTRACE(D_TIMER)
		tptrace(TPPTmisc, "tp_freeref ref maxrefopen",
		r - tp_ref, tp_refinfo.tpr_maxopen, 0, 0);
	ENDTRACE
	r->tpr_state = REF_FREE;
	IFDEBUG(D_CONN)
		printf("tp_freeref: CLEARING tpr_pcb 0x%x\n", r->tpr_pcb);
	ENDDEBUG
	r->tpr_pcb = (struct tp_pcb *)0;
	if (tpcb)
		tpcb->tp_refp = 0;

	for (r = tp_ref + tp_refinfo.tpr_maxopen; r > tp_ref; r--)
		if (r->tpr_pcb)
			break;
	tp_refinfo.tpr_maxopen = r - tp_ref;
	tp_refinfo.tpr_numopen--;

	IFDEBUG(D_TIMER)
		printf("tp_freeref ends w/ maxrefopen %d\n", tp_refinfo.tpr_maxopen);
	ENDDEBUG
}

/*
 * NAME:  tp_getref()
 *
 * CALLED FROM:
 *  tp_attach()
 *
 * FUNCTION and ARGUMENTS:
 *  obtains the next free reference and allocates the appropriate
 *  ref structure, links that structure to (tpcb)
 *
 * RETURN VALUE:
 *	a reference number
 *  or TP_ENOREF
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 */
u_long
tp_getref(tpcb)
	register struct tp_pcb *tpcb;
{
	register struct tp_ref	*r, *rlim;
	register int 			i;
	caddr_t obase;
	unsigned size;

	if (++tp_refinfo.tpr_numopen < tp_refinfo.tpr_size)
		for (r = tp_refinfo.tpr_base, rlim = r + tp_refinfo.tpr_size;
								++r < rlim; ) 	/* tp_ref[0] is never used */
			if (r->tpr_pcb == 0)
				goto got_one;
	/* else have to allocate more space */

	obase = (caddr_t)tp_refinfo.tpr_base;
	size = tp_refinfo.tpr_size * sizeof(struct tp_ref);
	r = (struct tp_ref *) malloc(size + size, M_PCB, M_NOWAIT);
	if (r == 0)
		return (--tp_refinfo.tpr_numopen, TP_ENOREF);
	tp_refinfo.tpr_base = tp_ref = r;
	tp_refinfo.tpr_size *= 2;
	bcopy(obase, (caddr_t)r, size);
	free(obase, M_PCB);
	r = (struct tp_ref *)(size + (caddr_t)r);
	bzero((caddr_t)r, size);

got_one:
	r->tpr_pcb = tpcb;
	r->tpr_state = REF_OPENING;
	tpcb->tp_refp = r;
	i = r - tp_refinfo.tpr_base;
	if (tp_refinfo.tpr_maxopen < i)
		tp_refinfo.tpr_maxopen = i;
	return i;
}

/*
 * NAME: tp_set_npcb()
 *
 * CALLED FROM:
 *	tp_attach(), tp_route_to()
 *
 * FUNCTION and ARGUMENTS:
 *  given a tpcb, allocate an appropriate lower-lever npcb, freeing
 *  any old ones that might need re-assigning.
 */
tp_set_npcb(tpcb)
register struct tp_pcb *tpcb;
{
	register struct socket *so = tpcb->tp_sock;
	int error;

	if (tpcb->tp_nlproto && tpcb->tp_npcb) {
		short so_state = so->so_state;
		so->so_state &= ~SS_NOFDREF;
		tpcb->tp_nlproto->nlp_pcbdetach(tpcb->tp_npcb);
		so->so_state = so_state;
	}
	tpcb->tp_nlproto = &nl_protosw[tpcb->tp_netservice];
	/* xx_pcballoc sets so_pcb */
	error = tpcb->tp_nlproto->nlp_pcballoc(so, tpcb->tp_nlproto->nlp_pcblist);
	tpcb->tp_npcb = so->so_pcb;
	so->so_pcb = (caddr_t)tpcb;
	return (error);
}
/*
 * NAME: tp_attach()
 *
 * CALLED FROM:
 *	tp_usrreq, PRU_ATTACH
 *
 * FUNCTION and ARGUMENTS:
 *  given a socket (so) and a protocol family (dom), allocate a tpcb
 *  and ref structure, initialize everything in the structures that
 *  needs to be initialized.
 *
 * RETURN VALUE:
 *  0 ok
 *  EINVAL if DEBUG(X) in is on and a disaster has occurred
 *  ENOPROTOOPT if TP hasn't been configured or if the
 *   socket wasn't created with tp as its protocol
 *  EISCONN if this socket is already part of a connection
 *  ETOOMANYREFS if ran out of tp reference numbers.
 *  E* whatever error is returned from soreserve()
 *    for from the network-layer pcb allocation routine
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 */
tp_attach(so, protocol)
	struct socket 			*so;
	int 					protocol;
{
	register struct tp_pcb	*tpcb;
	int 					error;
	int 					dom = so->so_proto->pr_domain->dom_family;
	u_long					lref;
	extern struct tp_conn_param tp_conn_param[];

	IFDEBUG(D_CONN)
		printf("tp_attach:dom 0x%x so 0x%x ", dom, so);
	ENDDEBUG
	IFTRACE(D_CONN)
		tptrace(TPPTmisc, "tp_attach:dom so", dom, so, 0, 0);
	ENDTRACE
	if ( ! tp_param.tpp_configed ) {
		error = ENOPROTOOPT; /* protocol not available */
		goto bad2;
	}

	if (so->so_pcb != NULL) {
		return EISCONN;	/* socket already part of a connection*/
	}

	error = soreserve(so, 2 * TP_SOCKBUFSIZE, TP_SOCKBUFSIZE);
		/* later an ioctl will allow reallocation IF still in closed state */

	if (error)
		goto bad2;

	MALLOC(tpcb, struct tp_pcb *, sizeof(*tpcb), M_PCB, M_NOWAIT);
	if (tpcb == NULL) {
		error = ENOBUFS;
		goto bad2;
	}
	bzero( (caddr_t)tpcb, sizeof (struct tp_pcb) );

	if ( ((lref = tp_getref(tpcb)) &  TP_ENOREF) != 0 ) {
		error = ETOOMANYREFS;
		goto bad3;
	}
	tpcb->tp_lref = lref;
	tpcb->tp_sock =  so;
	tpcb->tp_domain = dom;
	/* tpcb->tp_proto = protocol; someday maybe? */
	if (protocol && protocol<ISOPROTO_TP4) {
		tpcb->tp_netservice = ISO_CONS;
		tpcb->tp_snduna = (SeqNum) -1;/* kludge so the pseudo-ack from the CR/CC
								 * will generate correct fake-ack values
								 */
	} else {
		tpcb->tp_netservice = (dom== AF_INET)?IN_CLNS:ISO_CLNS;
		/* the default */
	}
	tpcb->_tp_param = tp_conn_param[tpcb->tp_netservice];

	tpcb->tp_state = TP_CLOSED;
	tpcb->tp_vers  = TP_VERSION;
	tpcb->tp_notdetached = 1;

		   /* Spec says default is 128 octets,
			* that is, if the tpdusize argument never appears, use 128.
			* As the initiator, we will always "propose" the 2048
			* size, that is, we will put this argument in the CR
			* always, but accept what the other side sends on the CC.
			* If the initiator sends us something larger on a CR,
			* we'll respond w/ this.
			* Our maximum is 4096.  See tp_chksum.c comments.
			*/
	tpcb->tp_cong_win =
		tpcb->tp_l_tpdusize = 1 << tpcb->tp_tpdusize;

	tpcb->tp_seqmask  = TP_NML_FMT_MASK;
	tpcb->tp_seqbit  =  TP_NML_FMT_BIT;
	tpcb->tp_seqhalf  =  tpcb->tp_seqbit >> 1;

	/* attach to a network-layer protoswitch */
	if ( error =  tp_set_npcb(tpcb))
		goto bad4;
	ASSERT( tpcb->tp_nlproto->nlp_afamily == tpcb->tp_domain);

	/* nothing to do for iso case */
	if( dom == AF_INET )
		sotoinpcb(so)->inp_ppcb = (caddr_t) tpcb;

	return 0;

bad4:
	IFDEBUG(D_CONN)
		printf("BAD4 in tp_attach, so 0x%x\n", so);
	ENDDEBUG
	tp_freeref(tpcb->tp_refp);

bad3:
	IFDEBUG(D_CONN)
		printf("BAD3 in tp_attach, so 0x%x\n", so);
	ENDDEBUG

	free((caddr_t)tpcb, M_PCB); /* never a cluster  */

bad2:
	IFDEBUG(D_CONN)
		printf("BAD2 in tp_attach, so 0x%x\n", so);
	ENDDEBUG
	so->so_pcb = 0;

/*bad:*/
	IFDEBUG(D_CONN)
		printf("BAD in tp_attach, so 0x%x\n", so);
	ENDDEBUG
	return error;
}

/*
 * NAME:  tp_detach()
 *
 * CALLED FROM:
 *	tp.trans, on behalf of a user close request
 *  and when the reference timer goes off
 * (if the disconnect  was initiated by the protocol entity
 * rather than by the user)
 *
 * FUNCTION and ARGUMENTS:
 *  remove the tpcb structure from the list of active or
 *  partially active connections, recycle all the mbufs
 *  associated with the pcb, ref structure, sockbufs, etc.
 *  Only free the ref structure if you know that a ref timer
 *  wasn't set for this tpcb.
 *
 * RETURNS:  Nada
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 *  tp_soisdisconnected() was already when this is called
 */
void
tp_detach(tpcb)
	register struct tp_pcb 	*tpcb;
{
	void					tp_freeref(), tp_rsyflush();
	register struct socket	 *so = tpcb->tp_sock;

	IFDEBUG(D_CONN)
		printf("tp_detach(tpcb 0x%x, so 0x%x)\n",
			tpcb,so);
	ENDDEBUG
	IFTRACE(D_CONN)
		tptraceTPCB(TPPTmisc, "tp_detach tpcb so lsufx",
			tpcb, so, *(u_short *)(tpcb->tp_lsuffix), 0);
	ENDTRACE

	IFDEBUG(D_CONN)
		printf("so_snd at 0x%x so_rcv at 0x%x\n", &so->so_snd, &so->so_rcv);
		dump_mbuf(so->so_snd.sb_mb, "so_snd at detach ");
		printf("about to call LL detach, nlproto 0x%x, nl_detach 0x%x\n",
				tpcb->tp_nlproto, tpcb->tp_nlproto->nlp_pcbdetach);
	ENDDEBUG

	if (tpcb->tp_Xsnd.sb_mb) {
		printf("Unsent Xdata on detach; would panic");
		sbflush(&tpcb->tp_Xsnd);
	}
	if (tpcb->tp_ucddata)
		m_freem(tpcb->tp_ucddata);

	IFDEBUG(D_CONN)
		printf("reassembly info cnt %d rsyq 0x%x\n",
		    tpcb->tp_rsycnt, tpcb->tp_rsyq);
	ENDDEBUG
	if (tpcb->tp_rsyq)
		tp_rsyflush(tpcb);

	if (tpcb->tp_next) {
		remque(tpcb);
		tpcb->tp_next = tpcb->tp_prev = 0;
	}
	tpcb->tp_notdetached = 0;

	IFDEBUG(D_CONN)
		printf("calling (...nlproto->...)(0x%x, so 0x%x)\n",
			tpcb->tp_npcb, so);
		printf("so 0x%x so_head 0x%x,  qlen %d q0len %d qlimit %d\n",
		so,  so->so_head,
		so->so_q0len, so->so_qlen, so->so_qlimit);
	ENDDEBUG

	(tpcb->tp_nlproto->nlp_pcbdetach)(tpcb->tp_npcb);
				/* does an so->so_pcb = 0; sofree(so) */

	IFDEBUG(D_CONN)
		printf("after xxx_pcbdetach\n");
	ENDDEBUG

	if (tpcb->tp_state == TP_LISTENING) {
		register struct tp_pcb **tt;
		for (tt = &tp_listeners; *tt; tt = &((*tt)->tp_nextlisten))
			if (*tt == tpcb)
				break;
		if (*tt)
			*tt = tpcb->tp_nextlisten;
		else
			printf("tp_detach from listen: should panic\n");
	}
	if (tpcb->tp_refp && tpcb->tp_refp->tpr_state == REF_OPENING ) {
		/* no connection existed here so no reference timer will be called */
		IFDEBUG(D_CONN)
			printf("SETTING ref %d, 0x%x to REF_FREE\n", tpcb->tp_lref,
			tpcb->tp_refp - &tp_ref[0]);
		ENDDEBUG

		tp_freeref(tpcb->tp_refp);
	}
#ifdef TP_PERF_MEAS
	/*
	 * Get rid of the cluster mbuf allocated for performance measurements, if
	 * there is one.  Note that tpcb->tp_perf_on says nothing about whether or
	 * not a cluster mbuf was allocated, so you have to check for a pointer
	 * to one (that is, we need the TP_PERF_MEASs around the following section
	 * of code, not the IFPERFs)
	 */
	if (tpcb->tp_p_mbuf) {
		register struct mbuf *m = tpcb->tp_p_mbuf;
		struct mbuf *n;
		IFDEBUG(D_PERF_MEAS)
			printf("freeing tp_p_meas 0x%x  ", tpcb->tp_p_meas);
		ENDDEBUG
		do {
		    MFREE(m, n);
		    m = n;
		} while (n);
		tpcb->tp_p_meas = 0;
		tpcb->tp_p_mbuf = 0;
	}
#endif TP_PERF_MEAS

	IFDEBUG(D_CONN)
		printf( "end of detach, NOT single, tpcb 0x%x\n", tpcb);
	ENDDEBUG
	/* free((caddr_t)tpcb, M_PCB); WHere to put this ? */
}

struct que {
	struct tp_pcb *next;
	struct tp_pcb *prev;
} tp_bound_pcbs =
{(struct tp_pcb *)&tp_bound_pcbs, (struct tp_pcb *)&tp_bound_pcbs};

u_short tp_unique;

tp_tselinuse(tlen, tsel, siso, reuseaddr)
caddr_t tsel;
register struct sockaddr_iso *siso;
{
	struct tp_pcb *b = tp_bound_pcbs.next, *l = tp_listeners;
	register struct tp_pcb *t;

	for (;;) {
		if (b != (struct tp_pcb *)&tp_bound_pcbs) {
			t = b; b = t->tp_next;
		} else if (l) {
			t = l; l = t->tp_nextlisten;
		} else
			break;
		if (tlen == t->tp_lsuffixlen && bcmp(tsel, t->tp_lsuffix, tlen) == 0) {
			if (t->tp_flags & TPF_GENERAL_ADDR) {
				if (siso == 0 || reuseaddr == 0)
					return 1;
			} else if (siso) {
				if (siso->siso_family == t->tp_domain &&
					t->tp_nlproto->nlp_cmpnetaddr(t->tp_npcb, siso, TP_LOCAL))
						return 1;
			} else if (reuseaddr == 0)
						return 1;
		}
	}
	return 0;

}


tp_pcbbind(tpcb, nam)
register struct tp_pcb *tpcb;
register struct mbuf *nam;
{
	register struct sockaddr_iso *siso = 0;
	int tlen = 0, wrapped = 0;
	caddr_t tsel;
	u_short tutil;

	if (tpcb->tp_state != TP_CLOSED)
		return (EINVAL);
	if (nam) {
		siso = mtod(nam, struct sockaddr_iso *);
		switch (siso->siso_family) {
		default:
			return (EAFNOSUPPORT);
#ifdef ISO
		case AF_ISO:
			tlen = siso->siso_tlen;
			tsel = TSEL(siso);
			if (siso->siso_nlen == 0)
				siso = 0;
			break;
#endif
#ifdef INET
		case AF_INET:
			tsel = (caddr_t)&tutil;
			if (tutil =  ((struct sockaddr_in *)siso)->sin_port) {
				tlen = 2;
			}
			if (((struct sockaddr_in *)siso)->sin_addr.s_addr == 0)
				siso = 0;
		}
#endif
	}
	if (tpcb->tp_lsuffixlen == 0) {
		if (tlen) {
			if (tp_tselinuse(tlen, tsel, siso,
								tpcb->tp_sock->so_options & SO_REUSEADDR))
				return (EINVAL);
		} else for (tsel = (caddr_t)&tp_unique, tlen = 2;;){
			if (tp_unique++ < ISO_PORT_RESERVED ||
				tp_unique > ISO_PORT_USERRESERVED) {
					if (wrapped++)
						return ESRCH;
					tp_unique = ISO_PORT_RESERVED;
			}
			if (tp_tselinuse(tlen, tsel, siso, 0) == 0)
				break;
		}
		bcopy(tsel, tpcb->tp_lsuffix, (tpcb->tp_lsuffixlen = tlen));
		insque(tpcb, &tp_bound_pcbs);
	} else {
		if (tlen || siso == 0)
			return (EINVAL);
	}
	if (siso == 0) {
		tpcb->tp_flags |= TPF_GENERAL_ADDR;
		return (0);
	}
	return tpcb->tp_nlproto->nlp_pcbbind(tpcb->tp_npcb, nam);
}