usr/src/sys/netiso/tp_cons.c

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

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

/*
 * 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 $
 *      @(#)tp_cons.c   7.4 (Berkeley) %G% *
 *
 * 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_mtu: figure out what size tpdu to use
 *              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 #
 */

#ifndef lint
static char *rcsid = "$Header: tp_cons.c,v 5.6 88/11/18 17:27:13 nhall Exp $";
#endif lint


#ifdef ISO
#ifdef TPCONS

#include "param.h"
#include "socket.h"
#include "domain.h"
#include "mbuf.h"
#include "errno.h"
#include "time.h"

#include "../net/if.h"
#include "../net/route.h"

#include "tp_param.h"
#include "argo_debug.h"
#include "tp_stat.h"
#include "tp_pcb.h"
#include "tp_trace.h"
#include "tp_stat.h"
#include "tp_tpdu.h"
#include "iso.h"
#include "iso_errno.h"
#include "iso_pcb.h"
#include "cons.h"
#include "tp_seq.h"

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

#include "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;
                return error;
        }
}


/*
 * CALLED FROM:
 *  tp_input() on incoming CR, CC, and pr_usrreq() for PRU_CONNECT
 * FUNCTION, ARGUMENTS, SIDE EFFECTS and RETURN VALUE:
 *  version of the previous procedure for X.25
 */

void
tpcons_mtu(so, isop, size, negot)
        struct socket *so;
        struct isopcb *isop;
        int *size;
        u_char *negot;
{
        register struct ifnet *ifp;
        register int i=0, isize;
        int windowsize = so->so_rcv.sb_hiwat;

        IFTRACE(D_CONN)
                tptrace(TPPTmisc, "ENTER GET MTU: size negot ",*size, *negot, 0, 0);
        ENDTRACE

        isize = *size = 1 << *negot;
#ifdef ancient_history
        if ((ifp = iso_routeifp(&isop->isop_faddr)) == (struct ifnet *)0)
                return;
#endif

        if (isize > windowsize) {
                isize = windowsize;
                i++;
        }
        if (isize > ifp->if_mtu) {
                isize = ifp->if_mtu;
                i++;
        }
        if (i) {
                /* size was changed by this routine - have to transform it to
                 * the log2 of size
                 */
                for (i = TP_MIN_TPDUSIZE; i < TP_MAX_TPDUSIZE; i++) {
                        if (isize <  (1 << (1 + i)))
                                break;
                }
                *negot = i;
                *size = 1 << i;
        }

        IFDEBUG(D_CONN)
                printf("GET MTU RETURNS: ifp %s size 0x%x negot 0x%x\n",
                ifp->if_name,   *size, *negot);
        ENDDEBUG
        IFTRACE(D_CONN)
                tptrace(TPPTmisc, "EXIT GET MTU: tpcb size negot ",
                *size, *negot, 0, 0);
        ENDTRACE
}

/*
 * 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;
{
        switch (cmd) {

        case PRC_CONS_SEND_DONE:
                if( isop->isop_socket ) { /* tp 0 only */
                        register struct tp_pcb *tpcb =
                                (struct tp_pcb *)isop->isop_socket->so_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( isop->isop_socket ) { /* tp 0 only */
                        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);
        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;
        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