xref: /csrg-svn/sys/netiso/tp_cons.c (revision 37469)

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

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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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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 $
 *
 * Here is where you find the iso-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_dg: package a pkt for cons given 2 addresses & some data
 *		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

#include "argoxtwentyfive.h"

#ifdef ISO
#if NARGOXTWENTYFIVE > 0

#include "param.h"
#include "socket.h"
#include "domain.h"
#include "mbuf.h"
#include "errno.h"
#include "time.h"
#include "../net/if.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 "../net/route.h"
#include "iso.h"
#include "iso_pcb.h"
#include "cons.h"
#include "tp_seq.h"

int tpcons_output();

/*
 * 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;
	int windowsize = so->so_rcv.sb_hiwat;
	struct ifnet	*iso_routeifp();

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


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

	if( *size > windowsize ) {
		*size = windowsize;
		i++;
	}

	if(*size > ifp->if_mtu) {
		*size = 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 && ((1<<i)<*size)) ; i++)
			;
		/* are we on the same LAN? if so, negotiate one tpdu size larger,
		 * and actually send the real mtu size
		 */
		/* PHASE2: replace with iso_on_localnet(&isop->isop_faddr);
		 */
		if ( !iso_netmatch(&isop->isop_laddr, &isop->isop_faddr) ) {
			i--;
			*size = 1<<i;
		}
		*negot = 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, so, channel)
	struct mbuf 		*m;
	struct sockaddr_iso	*faddr, *laddr;
	struct socket 		*so; /* not used */
	int					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;
{
	struct tp_pcb 		*tpcb;
	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(m0 == MNULL)
		return 0;
	ASSERT(m0->m_len > 0);
	tpcb = (struct tp_pcb *)isop->isop_socket->so_tpcb;

	/* check is for class EQUAL to 4: if still in negotiation stage,
	 * cannot send as dgm
	 */
	error = cons_output(isop, m0,  datalen, (tpcb->tp_class == TP_CLASS_4));
	IncStat(ts_tpdu_sent);

	IFTRACE(D_EMIT)
		tptrace( TPPTmisc,
		"tpcons_output( isop  m isdgm cons_output returns",
			isop, m0, (tpcb->tp_class == TP_CLASS_4), error );
	ENDTRACE
	return error;
}

/*
 * CALLED FROM:
 *  tp_error_emit()
 * FUNCTION and ARGUMENTS:
 *  This is a copy of tpcons_output that takes the addresses
 *  instead of a pcb.  It's used by the tp_error_emit, when we
 *  don't have an iso_pcb with which to call the normal output rtn.
 * RETURN VALUE:
 *  ENOBUFS or
 *  whatever (E*) is returned form the net layer output routine.
 */

int
tpcons_output_dg(laddr, faddr, m0, datalen, ro, nochksum)
	struct iso_addr		*laddr, *faddr;
	struct mbuf 		*m0;
	int 				datalen;
	struct route 		*ro;
	int					nochksum;
{
	IFDEBUG(D_TPISO)
		printf("PANIC: tpcons_output_dg  datalen 0x%x m0 0x%x\n", datalen, m0);
	ENDDEBUG

	return 0;
}

struct tp_pcb *
cons_chan_to_tpcb(chan)
	int chan;
{
	extern struct isopcb *cons_chan_to_pcb ();
#ifdef ARGO_DEBUG
	struct isopcb *isop = cons_chan_to_pcb (chan, -1);
#else ARGO_DEBUG
	struct isopcb *isop = cons_chan_to_pcb (chan);
#endif ARGO_DEBUG

	IFTRACE(D_CONN)
		tptrace(TPPTmisc, "vc->tpcb(chan) socket",
			chan, isop->isop_socket, 0, 0);
	ENDTRACE
	IFDEBUG(D_CONN)
		printf("vc->tpcb(0x%x) socket 0x%x, *ISOP dump:",
			chan, isop->isop_socket);
		dump_buf( isop, 32);
	ENDDEBUG
	if( isop->isop_socket == (struct socket *)0 )
		return (struct tp_pcb *) 0;
	else {
		return (struct tp_pcb *)(isop->isop_socket->so_tpcb);
}
}
#endif NARGOXTWENTYFIVE
#endif ISO