usr/src/sys/netiso/tp_cons.c

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)tp_cons.c   7.12 (Berkeley) %G%
 */

/***********************************************************
                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_cons.c,v 5.6 88/11/18 17:27:13 nhall Exp $
 * $Source: /usr/argo/sys/netiso/RCS/tp_cons.c,v $
 *
 * Here is where you find the iso- and cons-dependent code.  We've tried
 * keep all net-level and (primarily) address-family-dependent stuff
 * out of the tp source, and everthing here is reached indirectly
 * through a switch table (struct nl_protosw *) tpcb->tp_nlproto
 * (see tp_pcb.c).
 * The routines here are:
 *      tpcons_input: pullup and call tp_input w/ correct arguments
 *      tpcons_output: package a pkt for cons given an isopcb & some data
 *      cons_chan_to_tpcb: find a tpcb based on the channel #
 */

#ifdef ISO
#ifdef TPCONS

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

#include <net/if.h>
#include <net/route.h>

#include <netiso/tp_param.h>
#include <netiso/argo_debug.h>
#include <netiso/tp_stat.h>
#include <netiso/tp_pcb.h>
#include <netiso/tp_trace.h>
#include <netiso/tp_stat.h>
#include <netiso/tp_tpdu.h>
#include <netiso/iso.h>
#include <netiso/iso_errno.h>
#include <netiso/iso_pcb.h>
#include <netiso/cons.h>
#include <netiso/tp_seq.h>

#undef FALSE
#undef TRUE
#include <netccitt/x25.h>
#include <netccitt/pk.h>
#include <netccitt/pk_var.h>

#include <netiso/if_cons.c>
int tpcons_output();

/*
 * CALLED FROM:
 *  tp_route_to() for PRU_CONNECT
 * FUNCTION, ARGUMENTS, SIDE EFFECTS and RETURN VALUE:
 *  version of the previous procedure for X.25
 */

tpcons_pcbconnect(isop, nam)
struct isopcb *isop;
register struct mbuf *nam;
{
        int error;
        if (error = iso_pcbconnect(isop, nam))
                return error;
        if ((isop->isop_chan = (caddr_t) pk_attach((struct socket *)0)) == 0) {
                IFDEBUG(D_CCONS)
                        printf("tpcons_pcbconnect: no pklcd; returns 0x%x\n", error);
                ENDDEBUG
                return ENOBUFS;
        }
        if (error = cons_connect(isop)) { /* if it doesn't work */
                /* oh, dear, throw packet away */
                pk_disconnect((struct pklcd *)isop->isop_chan);
                isop->isop_chan = 0;
        } else
                isop->isop_refcnt = 1;
        return error;
}


/*
 * CALLED FROM:
 *      cons
 * FUNCTION and ARGUMENTS:
 * THIS MAYBE BELONGS IN SOME OTHER PLACE??? but i think not -
 */
ProtoHook
tpcons_ctlinput(cmd, siso, isop)
        int cmd;
        struct sockaddr_iso *siso;
        struct isopcb *isop;
{
        register struct tp_pcb *tpcb = 0;

        if (isop->isop_socket)
                tpcb = (struct tp_pcb *)isop->isop_socket->so_pcb;
        switch (cmd) {

        case PRC_CONS_SEND_DONE:
                if (tpcb) {
                        struct  tp_event                E;
                        int                                     error = 0;

                        if (tpcb->tp_class == TP_CLASS_0) {
                                /* only if class is exactly class zero, not
                                 * still in class negotiation
                                 */
                                /* fake an ack */
                                register SeqNum seq =  SEQ_ADD(tpcb, tpcb->tp_snduna, 1);

                                IFTRACE(D_DATA)
                                        tptrace(TPPTmisc, "FAKE ACK seq cdt 1",
                                                seq, 0,0,0);
                                ENDTRACE
                                IFDEBUG(D_DATA)
                                        printf("FAKE ACK seq 0x%x cdt 1\n", seq );
                                ENDDEBUG
                                E.ATTR(AK_TPDU).e_cdt = 1;
                                E.ATTR(AK_TPDU).e_seq = seq;
                                E.ATTR(AK_TPDU).e_subseq = 0;
                                E.ATTR(AK_TPDU).e_fcc_present = 0;
                                error =  DoEvent(AK_TPDU);
                                if( error ) {
                                        tpcb->tp_sock->so_error = error;
                                }
                        } /* else ignore it */
                }
                break;
        case PRC_ROUTEDEAD:
                if (tpcb && tpcb->tp_class == TP_CLASS_0) {
                        tpiso_reset(isop);
                        break;
                } /* else drop through */
        default:
                (void) tpclnp_ctlinput(cmd, siso);
                break;
        }
        return 0;
}

/*
 * CALLED FROM:
 *      cons's intr routine
 * FUNCTION and ARGUMENTS:
 * Take a packet (m) from cons, pullup m as required by tp,
 *  ignore the socket argument, and call tp_input.
 * No return value.
 */
ProtoHook
tpcons_input(m, faddr, laddr, channel)
        struct mbuf             *m;
        struct sockaddr_iso     *faddr, *laddr;
        caddr_t                         channel;
{
        if( m == MNULL)
                return 0;

        m = (struct mbuf *)tp_inputprep(m);

        IFDEBUG(D_TPINPUT)
                printf("tpcons_input before tp_input(m 0x%x)\n", m);
                dump_buf( m, 12+ m->m_len);
        ENDDEBUG
        tp_input(m, faddr, laddr, channel, tpcons_output, 0);
        return 0;
}


/*
 * CALLED FROM:
 *  tp_emit()
 * FUNCTION and ARGUMENTS:
 *  Take a packet(m0) from tp and package it so that cons will accept it.
 *  This means filling in a few of the fields.
 *  inp is the isopcb structure; datalen is the length of the data in the
 *  mbuf string m0.
 * RETURN VALUE:
 *  whatever (E*) is returned form the net layer output routine.
 */

int
tpcons_output(isop, m0, datalen, nochksum)
        struct isopcb           *isop;
        struct mbuf             *m0;
        int                             datalen;
        int                                     nochksum;
{
        register        struct mbuf *m = m0;
        int                                     error;

        IFDEBUG(D_EMIT)
                printf(
                "tpcons_output(isop 0x%x, m 0x%x, len 0x%x socket 0x%x\n",
                        isop, m0, datalen, isop->isop_socket);
        ENDDEBUG
        if (m == MNULL)
                return 0;
        if ((m->m_flags & M_PKTHDR) == 0) {
                MGETHDR(m, M_DONTWAIT, MT_DATA);
                if (m == 0)
                        return ENOBUFS;
                m->m_next = m0;
        }
        m->m_pkthdr.len = datalen;
        if (isop->isop_chan == 0) {
                /* got a restart maybe? */
                if ((isop->isop_chan = (caddr_t) pk_attach((struct socket *)0)) == 0) {
                        IFDEBUG(D_CCONS)
                                printf("tpcons_output: no pklcd\n");
                        ENDDEBUG
                        error = ENOBUFS;
                }
                if (error = cons_connect(isop)) {
                        pk_disconnect((struct pklcd *)isop->isop_chan);
                        isop->isop_chan = 0;
                        IFDEBUG(D_CCONS)
                                printf("tpcons_output: can't reconnect\n");
                        ENDDEBUG
                }
        } else {
                error = pk_send(isop->isop_chan, m);
                IncStat(ts_tpdu_sent);
        }
        return error;
}
/*
 * CALLED FROM:
 *  tp_error_emit()
 * FUNCTION and ARGUMENTS:
 *  Take a packet(m0) from tp and package it so that cons will accept it.
 *  chan is the cons channel to use; datalen is the length of the data in the
 *  mbuf string m0.
 * RETURN VALUE:
 *  whatever (E*) is returned form the net layer output routine.
 */

int
tpcons_dg_output(chan, m0, datalen)
        caddr_t                         chan;
        struct mbuf             *m0;
        int                             datalen;
{
        return tpcons_output(((struct pklcd *)chan)->lcd_upnext, m0, datalen, 0);
}
#endif /* TPCONS */
#endif /* ISO */