xnu-201.42.3.tar.gz

[apple/xnu.git] / bsd / netiso / tp_subr2.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 *      @(#)tp_subr2.c  8.1 (Berkeley) 6/10/93
 */

/***********************************************************
                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
 *
 * Some auxiliary routines:
 *      tp_protocol_error: required by xebec- called when a combo of state,
 *          event, predicate isn't covered for by the transition file.
 *      tp_indicate: gives indications(signals) to the user process
 *      tp_getoptions: initializes variables that are affected by the options
 *          chosen.
 */

/* this def'n is to cause the expansion of this macro in the
 * routine tp_local_credit :
 */
#define LOCAL_CREDIT_EXPAND

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

#undef MNULL
#include <netiso/argo_debug.h>
#include <netiso/tp_param.h>
#include <netiso/tp_ip.h>
#include <netiso/iso.h>
#include <netiso/iso_errno.h>
#include <netiso/iso_pcb.h>
#include <netiso/tp_timer.h>
#include <netiso/tp_stat.h>
#include <netiso/tp_tpdu.h>
#include <netiso/tp_pcb.h>
#include <netiso/tp_seq.h>
#include <netiso/tp_trace.h>
#include <netiso/tp_user.h>
#include <netiso/cons.h>

#include <net/if.h>
#include <net/if_types.h>
#ifdef TRUE
#undef FALSE
#undef TRUE
#endif
#include <netccitt/x25.h>
#include <netccitt/pk.h>
#include <netccitt/pk_var.h>

void tp_rsyset();

/*
 * NAME:        tp_local_credit()
 *
 * CALLED FROM:
 *  tp_emit(), tp_usrreq()
 *
 * FUNCTION and ARGUMENTS:
 *      Computes the local credit and stashes it in tpcb->tp_lcredit.
 *  It's a macro in the production system rather than a procdure.
 *
 * RETURNS:
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 *  This doesn't actually get called in a production system - 
 *  the macro gets expanded instead in place of calls to this proc.
 *  But for debugging, we call this and that allows us to add
 *  debugging messages easily here.
 */
void
tp_local_credit(tpcb)
        struct tp_pcb *tpcb;
{
        LOCAL_CREDIT(tpcb);
        IFDEBUG(D_CREDIT)
                printf("ref 0x%x lcdt 0x%x l_tpdusize 0x%x decbit 0x%x\n",
                        tpcb->tp_lref, 
                        tpcb->tp_lcredit, 
                        tpcb->tp_l_tpdusize, 
                        tpcb->tp_decbit, 
                        tpcb->tp_cong_win
                        );
        ENDDEBUG
        IFTRACE(D_CREDIT)
                tptraceTPCB(TPPTmisc,
                        "lcdt tpdusz \n",
                         tpcb->tp_lcredit, tpcb->tp_l_tpdusize, 0, 0);
        ENDTRACE
}

/*
 * NAME:  tp_protocol_error()
 *
 * CALLED FROM:
 *  tp_driver(), when it doesn't know what to do with
 *      a combo of event, state, predicate
 *
 * FUNCTION and ARGUMENTS:
 *  print error mesg 
 *
 * RETURN VALUE:
 *  EIO - always
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 */
int
tp_protocol_error(e,tpcb)
        struct tp_event *e;
        struct tp_pcb   *tpcb;
{
        printf("TP PROTOCOL ERROR! tpcb 0x%x event 0x%x, state 0x%x\n",
                tpcb, e->ev_number, tpcb->tp_state);
        IFTRACE(D_DRIVER)
                tptraceTPCB(TPPTmisc, "PROTOCOL ERROR tpcb event state",
                        tpcb, e->ev_number, tpcb->tp_state, 0 );
        ENDTRACE
        return EIO; /* for lack of anything better */
}


/* Not used at the moment */
ProtoHook
tp_drain()
{
        return 0;
}


/*
 * NAME: tp_indicate()
 *
 * CALLED FROM:
 *      tp.trans when XPD arrive, when a connection is being disconnected by
 *  the arrival of a DR or ER, and when a connection times out.
 *
 * FUNCTION and ARGUMENTS:
 *  (ind) is the type of indication : T_DISCONNECT, T_XPD
 *  (error) is an E* value that will be put in the socket structure
 *  to be passed along to the user later.
 *      Gives a SIGURG to the user process or group indicated by the socket
 *      attached to the tpcb.
 *
 * RETURNS:  Rien
 * 
 * SIDE EFFECTS:
 *
 * NOTES:
 */
void
tp_indicate(ind, tpcb, error)
        int                             ind; 
        u_short                 error;
        register struct tp_pcb  *tpcb;
{
        register struct socket *so = tpcb->tp_sock;
        IFTRACE(D_INDICATION)
                tptraceTPCB(TPPTindicate, ind, *(u_short *)(tpcb->tp_lsuffix), 
                        *(u_short *)(tpcb->tp_fsuffix), error,so->so_pgid);
        ENDTRACE
        IFDEBUG(D_INDICATION)
                char *ls, *fs;
                ls = tpcb->tp_lsuffix, 
                fs = tpcb->tp_fsuffix, 

                printf(
"indicate 0x%x lsuf 0x%02x%02x fsuf 0x%02x%02x err 0x%x  noind 0x%x ref 0x%x\n",
                ind, 
                *ls, *(ls+1), *fs, *(fs+1),
                error, /*so->so_pgrp,*/
                tpcb->tp_no_disc_indications,
                tpcb->tp_lref);
        ENDDEBUG

        if (ind == ER_TPDU) {
                register struct mbuf *m;
                struct tp_disc_reason x;

                if ((so->so_state & SS_CANTRCVMORE) == 0 &&
                                (m = m_get(M_DONTWAIT, MT_OOBDATA)) != 0) {

                        x.dr_hdr.cmsg_len = m->m_len = sizeof(x);
                        x.dr_hdr.cmsg_level = SOL_TRANSPORT;
                        x.dr_hdr.cmsg_type= TPOPT_DISC_REASON;
                        x.dr_reason = error;
                        *mtod(m, struct tp_disc_reason *) = x;
                        sbappendrecord(&tpcb->tp_Xrcv, m);
                        error = 0;
                } else
                        error = ECONNRESET;
        }
        so->so_error = error;

        if (ind == T_DISCONNECT)  {
                if (error == 0)
                        so->so_error = ENOTCONN;
                if ( tpcb->tp_no_disc_indications )
                        return;
        }
        IFTRACE(D_INDICATION)
                tptraceTPCB(TPPTmisc, "doing sohasoutofband(so)", so,0,0,0);
        ENDTRACE
        sohasoutofband(so);
}

/*
 * NAME : tp_getoptions()
 *
 * CALLED FROM:
 *      tp.trans whenever we go into OPEN state 
 *
 * FUNCTION and ARGUMENTS:
 *  sets the proper flags and values in the tpcb, to control
 *  the appropriate actions for the given class, options,
 *  sequence space, etc, etc.
 * 
 * RETURNS: Nada
 * 
 * SIDE EFFECTS:
 *
 * NOTES:
 */
void
tp_getoptions(tpcb)
struct tp_pcb *tpcb;
{
        tpcb->tp_seqmask = 
                tpcb->tp_xtd_format ?   TP_XTD_FMT_MASK :       TP_NML_FMT_MASK ;
        tpcb->tp_seqbit =
                tpcb->tp_xtd_format ?   TP_XTD_FMT_BIT :        TP_NML_FMT_BIT ;
        tpcb->tp_seqhalf = tpcb->tp_seqbit >> 1;
        tpcb->tp_dt_ticks =
                max(tpcb->tp_dt_ticks, (tpcb->tp_peer_acktime + 2));
        tp_rsyset(tpcb);
        
}

/*
 * NAME:  tp_recycle_tsuffix()
 *
 * CALLED FROM:
 *  Called when a ref is frozen.
 *
 * FUNCTION and ARGUMENTS:
 *  allows the suffix to be reused. 
 *
 * RETURNS: zilch
 *
 * SIDE EFFECTS:
 *
 * NOTES:
 */
void
tp_recycle_tsuffix(tpcb)
        struct tp_pcb   *tpcb;
{
        bzero((caddr_t)tpcb->tp_lsuffix, sizeof( tpcb->tp_lsuffix));
        bzero((caddr_t)tpcb->tp_fsuffix, sizeof( tpcb->tp_fsuffix));
        tpcb->tp_fsuffixlen = tpcb->tp_lsuffixlen = 0;

        (tpcb->tp_nlproto->nlp_recycle_suffix)(tpcb->tp_npcb);
}

/*
 * NAME: tp_quench()
 *
 * CALLED FROM:
 *  tp{af}_quench() when ICMP source quench or similar thing arrives.
 *
 * FUNCTION and ARGUMENTS:
 *  Drop the congestion window back to 1.
 *  Congestion window scheme:
 *  Initial value is 1.  ("slow start" as Nagle, et. al. call it)
 *  For each good ack that arrives, the congestion window is increased
 *  by 1 (up to max size of logical infinity, which is to say, 
 *      it doesn't wrap around).
 *  Source quench causes it to drop back to 1.
 *  tp_send() uses the smaller of (regular window, congestion window). 
 *  One retransmission strategy option is to have any retransmission 
 *      cause reset the congestion window back  to 1.
 *
 *      (cmd) is either PRC_QUENCH: source quench, or
 *              PRC_QUENCH2: dest. quench (dec bit)
 *
 * RETURNS:
 * 
 * SIDE EFFECTS:
 * 
 * NOTES:
 */
void
tp_quench( tpcb, cmd )
        struct tp_pcb *tpcb;
        int cmd;
{
        IFDEBUG(D_QUENCH)
                printf("tp_quench tpcb 0x%x ref 0x%x sufx 0x%x\n",
                        tpcb, tpcb->tp_lref, *(u_short *)(tpcb->tp_lsuffix));
                printf("cong_win 0x%x decbit 0x%x \n",
                        tpcb->tp_cong_win, tpcb->tp_decbit);
        ENDDEBUG
        switch(cmd) {
                case PRC_QUENCH:
                        tpcb->tp_cong_win = tpcb->tp_l_tpdusize;
                        IncStat(ts_quench);
                        break;
                case PRC_QUENCH2:
                        tpcb->tp_cong_win = tpcb->tp_l_tpdusize; /* might as well quench source also */
                        tpcb->tp_decbit = TP_DECBIT_CLEAR_COUNT;
                        IncStat(ts_rcvdecbit);
                        break;
        }
}


/*
 * NAME:        tp_netcmd()
 *
 * CALLED FROM:                 
 *
 * FUNCTION and ARGUMENTS:                      
 *
 * RETURNS:                     
 *
 * SIDE EFFECTS:        
 *
 * NOTES:                       
 */
tp_netcmd( tpcb, cmd )
        struct tp_pcb *tpcb;
        int cmd;
{
#if TPCONS
        struct isopcb *isop;
        struct pklcd *lcp;

        if (tpcb->tp_netservice != ISO_CONS)
                return;
        isop = (struct isopcb *)tpcb->tp_npcb;
        lcp = (struct pklcd *)isop->isop_chan;
        switch (cmd) {

        case CONN_CLOSE:
        case CONN_REFUSE:
                if (isop->isop_refcnt == 1) {
                        /* This is really superfluous, since it would happen
                           anyway in iso_pcbdetach, although it is a courtesy
                           to free up the x.25 channel before the refwait timer
                           expires. */
                        lcp->lcd_upper = 0;
                        lcp->lcd_upnext = 0;
                        pk_disconnect(lcp);
                        isop->isop_chan = 0;
                        isop->isop_refcnt = 0;
                }
                break;

        default:
                printf("tp_netcmd(0x%x, 0x%x) NOT IMPLEMENTED\n", tpcb, cmd);
                break;
        }
#else /* TPCONS */
        printf("tp_netcmd(): X25 NOT CONFIGURED!!\n");
#endif
}
/*
 * CALLED FROM:
 *  tp_ctloutput() and tp_emit()
 * FUNCTION and ARGUMENTS:
 *      Convert a class mask to the highest numeric value it represents.
 */

int
tp_mask_to_num(x)
        u_char x;
{
        register int j;

        for(j = 4; j>=0 ;j--) {
                if(x & (1<<j))
                        break;
        }
        ASSERT( (j == 4) || (j == 0) ); /* for now */
        if( (j != 4) && (j != 0) ) {
                printf("ASSERTION ERROR: tp_mask_to_num: x 0x%x j %d\n",
                        x, j);
        }
        IFTRACE(D_TPINPUT)
                tptrace(TPPTmisc, "tp_mask_to_num(x) returns j", x, j, 0, 0);
        ENDTRACE
        IFDEBUG(D_TPINPUT)
                printf("tp_mask_to_num(0x%x) returns 0x%x\n", x, j);
        ENDDEBUG
        return j;
}

static 
copyQOSparms(src, dst)
        struct tp_conn_param *src, *dst;
{
        /* copy all but the bits stuff at the end */
#define COPYSIZE (12 * sizeof(short))

        bcopy((caddr_t)src, (caddr_t)dst, COPYSIZE);
        dst->p_tpdusize = src->p_tpdusize;
        dst->p_ack_strat = src->p_ack_strat;
        dst->p_rx_strat = src->p_rx_strat;
#undef COPYSIZE
}
/*
 * Determine a reasonable value for maxseg size.
 * If the route is known, check route for mtu.
 * We also initialize the congestion/slow start
 * window to be a single segment if the destination isn't local.
 * While looking at the routing entry, we also initialize other path-dependent
 * parameters from pre-set or cached values in the routing entry.
 */
void
tp_mss(tpcb, nhdr_size)
        register struct tp_pcb *tpcb;
        int nhdr_size;
{
        register struct rtentry *rt;
        struct ifnet *ifp;
        register int rtt, mss;
        u_long bufsize;
        int i, ssthresh = 0, rt_mss;
        struct socket *so;

        if (tpcb->tp_ptpdusize)
                mss = tpcb->tp_ptpdusize << 7;
        else
                mss = 1 << tpcb->tp_tpdusize;
        so = tpcb->tp_sock;
        if ((rt = *(tpcb->tp_routep)) == 0) {
                bufsize = so->so_rcv.sb_hiwat;
                goto punt_route;
        }
        ifp = rt->rt_ifp;

#ifdef RTV_MTU  /* if route characteristics exist ... */
        /*
         * While we're here, check if there's an initial rtt
         * or rttvar.  Convert from the route-table units
         * to hz ticks for the smoothed timers and slow-timeout units
         * for other inital variables.
         */
        if (tpcb->tp_rtt == 0 && (rtt = rt->rt_rmx.rmx_rtt)) {
                tpcb->tp_rtt = rtt * hz / RTM_RTTUNIT;
                if (rt->rt_rmx.rmx_rttvar)
                        tpcb->tp_rtv = rt->rt_rmx.rmx_rttvar
                                                * hz / RTM_RTTUNIT;
                else
                        tpcb->tp_rtv = tpcb->tp_rtt;
        }
        /*
         * if there's an mtu associated with the route, use it
         */
        if (rt->rt_rmx.rmx_mtu)
                rt_mss = rt->rt_rmx.rmx_mtu - nhdr_size;
        else
#endif /* RTV_MTU */
                rt_mss = (ifp->if_mtu - nhdr_size);
        if (tpcb->tp_ptpdusize == 0 || /* assume application doesn't care */
            mss > rt_mss /* network won't support what was asked for */)
                mss = rt_mss;
        /* can propose mtu which are multiples of 128 */
        mss &= ~0x7f;
        /*
         * If there's a pipesize, change the socket buffer
         * to that size.
         */
#ifdef RTV_SPIPE
        if ((bufsize = rt->rt_rmx.rmx_sendpipe) > 0) {
#endif
                bufsize = min(bufsize, so->so_snd.sb_hiwat);
                (void) sbreserve(&so->so_snd, bufsize);
        }
#ifdef RTV_SPIPE
        if ((bufsize = rt->rt_rmx.rmx_recvpipe) > 0) {
#endif
                bufsize = min(bufsize, so->so_rcv.sb_hiwat);
                (void) sbreserve(&so->so_rcv, bufsize);
        } else
                bufsize = so->so_rcv.sb_hiwat;
#ifdef RTV_SSTHRESH
        /*
         * There's some sort of gateway or interface
         * buffer limit on the path.  Use this to set
         * the slow start threshhold, but set the
         * threshold to no less than 2*mss.
         */
        ssthresh = rt->rt_rmx.rmx_ssthresh;
punt_route:
        /*
         * The current mss is initialized to the default value.
         * If we compute a smaller value, reduce the current mss.
         * If we compute a larger value, return it for use in sending
         * a max seg size option.
         * If we received an offer, don't exceed it.
         * However, do not accept offers under 128 bytes.
         */
        if (tpcb->tp_l_tpdusize)
                mss = min(mss, tpcb->tp_l_tpdusize);
        /*
         * We want a minimum recv window of 4 packets to
         * signal packet loss by duplicate acks.
         */
        mss = min(mss, bufsize >> 2) & ~0x7f;
        mss = max(mss, 128);            /* sanity */
        tpcb->tp_cong_win =
                (rt == 0 || (rt->rt_flags & RTF_GATEWAY)) ? mss : bufsize;
        tpcb->tp_l_tpdusize = mss;
        tp_rsyset(tpcb);
        tpcb->tp_ssthresh = max(2 * mss, ssthresh);
        /* Calculate log2 of mss */
        for (i = TP_MIN_TPDUSIZE + 1; i <= TP_MAX_TPDUSIZE; i++)
                if ((1 << i) > mss)
                        break;
        i--;
        tpcb->tp_tpdusize = i;
#endif /* RTV_MTU */
}

/*
 * CALLED FROM:
 *  tp_usrreq on PRU_CONNECT and tp_input on receipt of CR
 *      
 * FUNCTION and ARGUMENTS:
 *      -- An mbuf containing the peer's network address.
 *  -- Our control block, which will be modified
 *  -- In the case of cons, a control block for that layer.
 *
 *      
 * RETURNS:
 *      errno value      : 
 *      EAFNOSUPPORT if can't find an nl_protosw for x.25 (really could panic)
 *      ECONNREFUSED if trying to run TP0 with non-type 37 address
 *  possibly other E* returned from cons_netcmd()
 *
 * SIDE EFFECTS:
 *   Determines recommended tpdusize, buffering and intial delays
 *       based on information cached on the route.
 */
int
tp_route_to( m, tpcb, channel)
        struct mbuf                                     *m;
        register struct tp_pcb          *tpcb;
        caddr_t                                         channel;
{
        register struct sockaddr_iso *siso;     /* NOTE: this may be a sockaddr_in */
        extern struct tp_conn_param tp_conn_param[];
        int error = 0, save_netservice = tpcb->tp_netservice;
        register struct rtentry *rt = 0;
        int nhdr_size, mtu, bufsize;

        siso = mtod(m, struct sockaddr_iso *);
        IFTRACE(D_CONN)
                tptraceTPCB(TPPTmisc, 
                "route_to: so  afi netservice class",
                tpcb->tp_sock, siso->siso_addr.isoa_genaddr[0], tpcb->tp_netservice,
                        tpcb->tp_class);
        ENDTRACE
        IFDEBUG(D_CONN)
                printf("tp_route_to( m x%x, channel 0x%x, tpcb 0x%x netserv 0x%x)\n", 
                        m, channel, tpcb, tpcb->tp_netservice);
                printf("m->mlen x%x, m->m_data:\n", m->m_len);
                dump_buf(mtod(m, caddr_t), m->m_len);
        ENDDEBUG
        if (channel) {
#if TPCONS
                struct pklcd *lcp = (struct pklcd *)channel;
                struct isopcb *isop = (struct isopcb *)lcp->lcd_upnext,
                        *isop_new = (struct isopcb *)tpcb->tp_npcb;
                /* The next 2 lines believe that you haven't
                   set any network level options or done a pcbconnect
                   and XXXXXXX'edly apply to both inpcb's and isopcb's */
                remque(isop_new);
                FREE(isop_new, M_PCB);
                tpcb->tp_npcb = (caddr_t)isop;
                tpcb->tp_netservice = ISO_CONS;
                tpcb->tp_nlproto = nl_protosw + ISO_CONS;
                if (isop->isop_refcnt++ == 0) {
                        iso_putsufx(isop, tpcb->tp_lsuffix, tpcb->tp_lsuffixlen, TP_LOCAL);
                        isop->isop_socket = tpcb->tp_sock;
                } else
                        /* there are already connections sharing this */;
#endif
        } else {
                switch (siso->siso_family) {
                default:
                        error = EAFNOSUPPORT;
                        goto done;
#if ISO
                case AF_ISO:
                {
                        struct isopcb *isop = (struct isopcb *)tpcb->tp_npcb;
                        int flags = tpcb->tp_sock->so_options & SO_DONTROUTE;
                        tpcb->tp_netservice = ISO_CLNS;
                        if (clnp_route(&siso->siso_addr, &isop->isop_route,
                                                        flags, (void **)0, (void **)0) == 0) {
                                rt = isop->isop_route.ro_rt;
                                if (rt && rt->rt_flags & RTF_PROTO1)
                                        tpcb->tp_netservice = ISO_CONS;
                        }
                }    break;
#endif
#if INET
                case AF_INET:
                        tpcb->tp_netservice = IN_CLNS;
#endif
                }
                if (tpcb->tp_nlproto->nlp_afamily != siso->siso_family) {
                        IFDEBUG(D_CONN)
                                printf("tp_route_to( CHANGING nlproto old 0x%x new 0x%x)\n", 
                                                save_netservice, tpcb->tp_netservice);
                        ENDDEBUG
                        if (error = tp_set_npcb(tpcb))
                                goto done;
                }
                IFDEBUG(D_CONN)
                        printf("tp_route_to  calling nlp_pcbconn, netserv %d\n",
                                tpcb->tp_netservice);
                ENDDEBUG
                tpcb->tp_nlproto = nl_protosw + tpcb->tp_netservice;
                error = (tpcb->tp_nlproto->nlp_pcbconn)(tpcb->tp_npcb, m);
        }
        if (error)
                goto done;
        nhdr_size = tpcb->tp_nlproto->nlp_mtu(tpcb); /* only gets common info */
        tp_mss(tpcb, nhdr_size);
done:
        IFDEBUG(D_CONN)
                printf("tp_route_to  returns 0x%x\n", error);
        ENDDEBUG
        IFTRACE(D_CONN)
                tptraceTPCB(TPPTmisc, "route_to: returns: error netserv class", error, 
                        tpcb->tp_netservice, tpcb->tp_class, 0);
        ENDTRACE
        return error;
}


/* class zero version */
void
tp0_stash( tpcb, e )
        register struct tp_pcb          *tpcb;
        register struct tp_event        *e;
{
#ifndef lint
#define E e->ATTR(DT_TPDU)
#else /* lint */
#define E e->ev_union.EV_DT_TPDU
#endif /* lint */

        register struct sockbuf *sb = &tpcb->tp_sock->so_rcv;
        register struct isopcb *isop = (struct isopcb *)tpcb->tp_npcb;

        IFPERF(tpcb)
                PStat(tpcb, Nb_from_ll) += E.e_datalen;
                tpmeas(tpcb->tp_lref, TPtime_from_ll, &e->e_time,
                                E.e_seq, PStat(tpcb, Nb_from_ll), E.e_datalen);
        ENDPERF

        IFDEBUG(D_STASH)
                printf("stash EQ: seq 0x%x datalen 0x%x eot 0x%x", 
                E.e_seq, E.e_datalen, E.e_eot);
        ENDDEBUG

        IFTRACE(D_STASH)
                tptraceTPCB(TPPTmisc, "stash EQ: seq len eot", 
                E.e_seq, E.e_datalen, E.e_eot, 0);
        ENDTRACE

        if ( E.e_eot ) {
                register struct mbuf *n = E.e_data;
                n->m_flags |= M_EOR;
                n->m_act = MNULL; /* set on tp_input */
        }
        sbappend(sb, E.e_data);
        IFDEBUG(D_STASH)
                dump_mbuf(sb->sb_mb, "stash 0: so_rcv after appending");
        ENDDEBUG
        if (tpcb->tp_netservice != ISO_CONS)
                printf("tp0_stash: tp running over something wierd\n");
        else {
                register struct pklcd *lcp = (struct pklcd *)isop->isop_chan;
                pk_flowcontrol(lcp, sbspace(sb) <= 0, 1);
        }
} 

void
tp0_openflow(tpcb)
register struct tp_pcb *tpcb;
{
        register struct isopcb *isop = (struct isopcb *)tpcb->tp_npcb;
        if (tpcb->tp_netservice != ISO_CONS)
                printf("tp0_openflow: tp running over something wierd\n");
        else {
                register struct pklcd *lcp = (struct pklcd *)isop->isop_chan;
                if (lcp->lcd_rxrnr_condition)
                        pk_flowcontrol(lcp, 0, 0);
        }
}
#ifndef TPCONS
static
pk_flowcontrol() {}
#endif

#ifdef TP_PERF_MEAS
/*
 * CALLED FROM:
 *  tp_ctloutput() when the user sets TPOPT_PERF_MEAS on
 *  and tp_newsocket() when a new connection is made from 
 *  a listening socket with tp_perf_on == true.
 * FUNCTION and ARGUMENTS:
 *  (tpcb) is the usual; this procedure gets a clear cluster mbuf for
 *  a tp_pmeas structure, and makes tpcb->tp_p_meas point to it.
 * RETURN VALUE:
 *  ENOBUFS if it cannot get a cluster mbuf.
 */

int 
tp_setup_perf(tpcb)
        register struct tp_pcb *tpcb;
{
        register struct mbuf *q;

        if( tpcb->tp_p_meas == 0 ) {
                MGET(q, M_WAIT, MT_PCB);
                if (q == 0)
                        return ENOBUFS;
                MCLGET(q, M_WAIT);
                if ((q->m_flags & M_EXT) == 0) {
                        (void) m_free(q);
                        return ENOBUFS;
                }
                q->m_len = sizeof (struct tp_pmeas);
                tpcb->tp_p_mbuf = q;
                tpcb->tp_p_meas = mtod(q, struct tp_pmeas *);
                bzero( (caddr_t)tpcb->tp_p_meas, sizeof (struct tp_pmeas) );
                IFDEBUG(D_PERF_MEAS)
                        printf(
                        "tpcb 0x%x so 0x%x ref 0x%x tp_p_meas 0x%x tp_perf_on 0x%x\n", 
                                tpcb, tpcb->tp_sock, tpcb->tp_lref, 
                                tpcb->tp_p_meas, tpcb->tp_perf_on);
                ENDDEBUG
                tpcb->tp_perf_on = 1;
        }
        return 0;
}
#endif /* TP_PERF_MEAS */

#ifdef ARGO_DEBUG
dump_addr (addr)
        register struct sockaddr *addr;
{
        switch( addr->sa_family ) {
                case AF_INET:
                        dump_inaddr((struct sockaddr_in *)addr);
                        break;
#if ISO
                case AF_ISO:
                        dump_isoaddr((struct sockaddr_iso *)addr);
                        break;
#endif /* ISO */
                default:
                        printf("BAD AF: 0x%x\n", addr->sa_family);
                        break;
        }
}

#define MAX_COLUMNS     8
/*
 *      Dump the buffer to the screen in a readable format. Format is:
 *
 *              hex/dec  where hex is the hex format, dec is the decimal format.
 *              columns of hex/dec numbers will be printed, followed by the
 *              character representations (if printable).
 */
Dump_buf(buf, len)
caddr_t buf;
int             len;
{
        int             i,j;
#define Buf ((u_char *)buf)
        printf("Dump buf 0x%x len 0x%x\n", buf, len);
        for (i = 0; i < len; i += MAX_COLUMNS) {
                printf("+%d:\t", i);
                for (j = 0; j < MAX_COLUMNS; j++) {
                        if (i + j < len) {
                                printf("%x/%d\t", Buf[i+j], Buf[i+j]);
                        } else {
                                printf("        ");
                        }
                }

                for (j = 0; j < MAX_COLUMNS; j++) {
                        if (i + j < len) {
                                if (((Buf[i+j]) > 31) && ((Buf[i+j]) < 128))
                                        printf("%c", Buf[i+j]);
                                else
                                        printf(".");
                        }
                }
                printf("\n");
        }
}
#endif /* ARGO_DEBUG */