initial import of NetBSD tree

1 files changed, 803 insertions, 0 deletions

diff --git a/sys/netccitt/if_x25subr.c b/sys/netccitt/if_x25subr.c
new file mode 100644
index 00000000000..42b15f0621c
--- /dev/null
+++ b/sys/netccitt/if_x25subr.c
@@ -0,0 +1,803 @@
+/*	$NetBSD: if_x25subr.c,v 1.11 1995/06/15 22:38:20 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1990, 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.
+ *
+ *	@(#)if_x25subr.c	8.1 (Berkeley) 6/10/93
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/ioctl.h>
+#include <sys/errno.h>
+#include <sys/syslog.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/netisr.h>
+#include <net/route.h>
+
+#include <netccitt/x25.h>
+#include <netccitt/x25err.h>
+#include <netccitt/pk.h>
+#include <netccitt/pk_var.h>
+
+#ifdef INET
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#endif
+
+#ifdef NS
+#include <netns/ns.h>
+#include <netns/ns_if.h>
+#endif
+
+#ifdef ISO
+int tp_incoming();
+#include <netiso/argo_debug.h>
+#include <netiso/iso.h>
+#include <netiso/iso_var.h>
+#endif
+
+LIST_HEAD(, llinfo_x25) llinfo_x25;
+#ifndef _offsetof
+#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
+#endif
+struct sockaddr *x25_dgram_sockmask;
+struct sockaddr_x25 x25_dgmask = {
+ _offsetof(struct sockaddr_x25, x25_udata[1]),			/* _len */
+ 0,								/* _family */
+ 0,								/* _net */
+ { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* _addr */
+ {0},								/* opts */
+ -1,								/* _udlen */
+ {-1}								/* _udata */
+};
+ 
+struct if_x25stats {
+	int	ifx_wrongplen;
+	int	ifx_nophdr;
+} if_x25stats;
+int x25_autoconnect = 0;
+
+#define senderr(x) {error = x; goto bad;}
+/*
+ * Ancillary routines
+ */
+static struct llinfo_x25 *
+x25_lxalloc(rt)
+register struct rtentry *rt;
+{
+	register struct llinfo_x25 *lx;
+	register struct sockaddr *dst = rt_key(rt);
+	register struct ifaddr *ifa;
+
+	MALLOC(lx, struct llinfo_x25 *, sizeof (*lx), M_PCB, M_NOWAIT);
+	if (lx == 0)
+		return lx;
+	Bzero(lx, sizeof(*lx));
+	lx->lx_rt = rt;
+	lx->lx_family = dst->sa_family;
+	rt->rt_refcnt++;
+	if (rt->rt_llinfo) {
+		LIST_INSERT_AFTER(
+		    (struct llinfo_x25 *)rt->rt_llinfo, lx, lx_list);
+	} else {
+		rt->rt_llinfo = (caddr_t)lx;
+		LIST_INSERT_HEAD(&llinfo_x25, lx, lx_list);
+	}
+	for (ifa = rt->rt_ifp->if_addrlist.tqh_first; ifa != 0;
+	    ifa = ifa->ifa_list.tqe_next) {
+		if (ifa->ifa_addr->sa_family == AF_CCITT)
+			lx->lx_ia = (struct x25_ifaddr *)ifa;
+	}
+	return lx;
+}
+x25_lxfree(lx)
+register struct llinfo_x25 *lx;
+{
+	register struct rtentry *rt = lx->lx_rt;
+	register struct pklcd *lcp = lx->lx_lcd;
+
+	if (lcp) {
+		lcp->lcd_upper = 0;
+		pk_disconnect(lcp);
+	}
+	if ((rt->rt_llinfo == (caddr_t)lx) && (lx->lx_list.le_next->lx_rt == rt))
+		rt->rt_llinfo = (caddr_t)lx->lx_list.le_next;
+	else
+		rt->rt_llinfo = 0;
+	RTFREE(rt);
+	LIST_REMOVE(lx, lx_list);
+	FREE(lx, M_PCB);
+}
+/*
+ * Process a x25 packet as datagram;
+ */
+x25_ifinput(lcp, m)
+struct pklcd *lcp;
+register struct mbuf *m;
+{
+	struct llinfo_x25 *lx = (struct llinfo_x25 *)lcp->lcd_upnext;
+	register struct ifnet *ifp;
+	struct ifqueue *inq;
+	extern struct timeval time;
+	int s, len, isr;
+ 
+	if (m == 0 || lcp->lcd_state != DATA_TRANSFER) {
+		x25_connect_callback(lcp, 0);
+		return;
+	}
+	pk_flowcontrol(lcp, 0, 1); /* Generate RR */
+	ifp = m->m_pkthdr.rcvif;
+	ifp->if_lastchange = time;
+	switch (m->m_type) {
+	default:
+		if (m)
+			m_freem(m);
+		return;
+
+	case MT_DATA:
+		/* FALLTHROUGH */;
+	}
+	switch (lx->lx_family) {
+#ifdef INET
+	case AF_INET:
+		isr = NETISR_IP;
+		inq = &ipintrq;
+		break;
+
+#endif
+#ifdef NS
+	case AF_NS:
+		isr = NETISR_NS;
+		inq = &nsintrq;
+		break;
+
+#endif
+#ifdef	ISO
+	case AF_ISO:
+		isr = NETISR_ISO;
+		inq = &clnlintrq;
+		break;
+#endif
+	default:
+		m_freem(m);
+		ifp->if_noproto++;
+		return;
+	}
+	s = splimp();
+	schednetisr(isr);
+	if (IF_QFULL(inq)) {
+		IF_DROP(inq);
+		m_freem(m);
+	} else {
+		IF_ENQUEUE(inq, m);
+		ifp->if_ibytes += m->m_pkthdr.len;
+	}
+	splx(s);
+}
+x25_connect_callback(lcp, m)
+register struct pklcd *lcp;
+register struct mbuf *m;
+{
+	register struct llinfo_x25 *lx = (struct llinfo_x25 *)lcp->lcd_upnext;
+	int do_clear = 1;
+	if (m == 0)
+		goto refused;
+	if (m->m_type != MT_CONTROL) {
+		printf("x25_connect_callback: should panic\n");
+		goto refused;
+	}
+	switch (pk_decode(mtod(m, struct x25_packet *))) {
+	case CALL_ACCEPTED:
+		lcp->lcd_upper = x25_ifinput;
+		if (lcp->lcd_sb.sb_mb)
+			lcp->lcd_send(lcp); /* XXX start queued packets */
+		return;
+	default:
+		do_clear = 0;
+	refused:
+		lcp->lcd_upper = 0;
+		lx->lx_lcd = 0;
+		if (do_clear)
+			pk_disconnect(lcp);
+		return;
+	}
+}
+#define SA(p) ((struct sockaddr *)(p))
+#define RT(p) ((struct rtentry *)(p))
+
+x25_dgram_incoming(lcp, m0)
+register struct pklcd *lcp;
+struct mbuf *m0;
+{
+	register struct rtentry *rt, *nrt;
+	register struct mbuf *m = m0->m_next; /* m0 has calling sockaddr_x25 */
+	void x25_rtrequest();
+
+	rt = rtalloc1(SA(&lcp->lcd_faddr), 0);
+	if (rt == 0) {
+refuse: 	lcp->lcd_upper = 0;
+		pk_close(lcp);
+		return;
+	}
+	rt->rt_refcnt--;
+	if ((nrt = RT(rt->rt_llinfo)) == 0 || rt_mask(rt) != x25_dgram_sockmask)
+		goto refuse;
+	if ((nrt->rt_flags & RTF_UP) == 0) {
+		rt->rt_llinfo = (caddr_t)rtalloc1(rt->rt_gateway, 0);
+		rtfree(nrt);
+		if ((nrt = RT(rt->rt_llinfo)) == 0)
+			goto refuse;
+		nrt->rt_refcnt--;
+	}
+	if (nrt->rt_ifa == 0 || nrt->rt_ifa->ifa_rtrequest != x25_rtrequest)
+		goto refuse;
+	lcp->lcd_send(lcp); /* confirm call */
+	x25_rtattach(lcp, nrt);
+	m_freem(m);
+}
+
+/*
+ * X.25 output routine.
+ */
+x25_ifoutput(ifp, m0, dst, rt)
+struct	ifnet *ifp;
+struct	mbuf *m0;
+struct	sockaddr *dst;
+register struct	rtentry *rt;
+{
+	register struct	mbuf *m = m0;
+	register struct	llinfo_x25 *lx;
+	struct pklcd *lcp;
+	int             s, error = 0;
+
+int plen;
+for (plen = 0; m; m = m->m_next)
+	plen += m->m_len;
+m = m0;
+
+	if ((ifp->if_flags & IFF_UP) == 0)
+		senderr(ENETDOWN);
+	while (rt == 0 || (rt->rt_flags & RTF_GATEWAY)) {
+		if (rt) {
+			if (rt->rt_llinfo) {
+				rt = (struct rtentry *)rt->rt_llinfo;
+				continue;
+			}
+			dst = rt->rt_gateway;
+		}
+		if ((rt = rtalloc1(dst, 1)) == 0)
+			senderr(EHOSTUNREACH);
+		rt->rt_refcnt--;
+	}
+	/*
+	 * Sanity checks.
+	 */
+	if ((rt->rt_ifp != ifp) ||
+	    (rt->rt_flags & (RTF_CLONING | RTF_GATEWAY)) ||
+	    ((lx = (struct llinfo_x25 *)rt->rt_llinfo) == 0)) {
+		senderr(ENETUNREACH);
+	}
+if ((m->m_flags & M_PKTHDR) == 0) {
+	if_x25stats.ifx_nophdr++;
+	m = m_gethdr(M_NOWAIT, MT_HEADER);
+	if (m == 0)
+		senderr(ENOBUFS);
+	m->m_pkthdr.len = plen;
+	m->m_next = m0;
+}
+if (plen != m->m_pkthdr.len) {
+	if_x25stats.ifx_wrongplen++;
+	m->m_pkthdr.len = plen;
+}
+next_circuit:
+	lcp = lx->lx_lcd;
+	if (lcp == 0) {
+		lx->lx_lcd = lcp = pk_attach((struct socket *)0);
+		if (lcp == 0)
+			senderr(ENOBUFS);
+		lcp->lcd_upper = x25_connect_callback;
+		lcp->lcd_upnext = (caddr_t)lx;
+		lcp->lcd_packetsize = lx->lx_ia->ia_xc.xc_psize;
+		lcp->lcd_flags = X25_MBS_HOLD;
+	}
+	switch (lcp->lcd_state) {
+	case READY:
+		if (dst->sa_family == AF_INET &&
+		    ifp->if_type == IFT_X25DDN &&
+		    rt->rt_gateway->sa_family != AF_CCITT)
+			x25_ddnip_to_ccitt(dst, rt);
+		if (rt->rt_gateway->sa_family != AF_CCITT) {
+			if ((rt->rt_flags & RTF_XRESOLVE) == 0)
+				senderr(EHOSTUNREACH);
+		} else if (x25_autoconnect)
+			error = pk_connect(lcp,
+					(struct sockaddr_x25 *)rt->rt_gateway);
+		if (error)
+			senderr(error);
+		/* FALLTHROUGH */
+	case SENT_CALL:
+	case DATA_TRANSFER:
+		if (sbspace(&lcp->lcd_sb) < 0) {
+			lx = lx->lx_list.le_next;
+			if (lx->lx_rt != rt)
+				senderr(ENOSPC);
+			goto next_circuit;
+		}
+		if (lx->lx_ia)
+			lcp->lcd_dg_timer =
+				       lx->lx_ia->ia_xc.xc_dg_idletimo;
+		pk_send(lcp, m);
+		break;
+	default:
+		/*
+		 * We count on the timer routine to close idle
+		 * connections, if there are not enough circuits to go
+		 * around.
+		 *
+		 * So throw away data for now.
+		 * After we get it all working, we'll rewrite to handle
+		 * actively closing connections (other than by timers),
+		 * when circuits get tight.
+		 *
+		 * In the DDN case, the imp itself closes connections
+		 * under heavy load.
+		 */
+		error = ENOBUFS;
+	bad:
+		if (m)
+			m_freem(m);
+	}
+	return (error);
+}
+
+/*
+ * Simpleminded timer routine.
+ */
+x25_iftimeout(ifp)
+struct ifnet *ifp;
+{
+	register struct pkcb *pkcb = 0;
+	register struct pklcd **lcpp, *lcp;
+	int s = splimp();
+
+	FOR_ALL_PKCBS(pkcb)
+	    if (pkcb->pk_ia->ia_ifp == ifp)
+		for (lcpp = pkcb->pk_chan + pkcb->pk_maxlcn;
+		     --lcpp > pkcb->pk_chan;)
+			if ((lcp = *lcpp) &&
+			    lcp->lcd_state == DATA_TRANSFER &&
+			    (lcp->lcd_flags & X25_DG_CIRCUIT) &&
+			    (lcp->lcd_dg_timer && --lcp->lcd_dg_timer == 0)) {
+				lcp->lcd_upper(lcp, 0);
+			}
+	splx(s);
+}
+/*
+ * This routine gets called when validating additions of new routes
+ * or deletions of old ones.
+ */
+void
+x25_rtrequest(cmd, rt, dst)
+	register struct rtentry *rt;
+	struct sockaddr *dst;
+{
+	register struct llinfo_x25 *lx = (struct llinfo_x25 *)rt->rt_llinfo;
+	register struct sockaddr_x25 *sa =(struct sockaddr_x25 *)rt->rt_gateway;
+	register struct pklcd *lcp;
+
+	/* would put this pk_init, except routing table doesn't
+	   exist yet. */
+	if (x25_dgram_sockmask == 0) {
+		struct radix_node *rn_addmask();
+		x25_dgram_sockmask =
+			SA(rn_addmask((caddr_t)&x25_dgmask, 0, 4)->rn_key);
+	}
+	if (rt->rt_flags & RTF_GATEWAY) {
+		if (rt->rt_llinfo)
+			RTFREE((struct rtentry *)rt->rt_llinfo);
+		rt->rt_llinfo = (cmd == RTM_ADD) ? 
+			(caddr_t)rtalloc1(rt->rt_gateway, 1) : 0;
+		return;
+	}
+	if ((rt->rt_flags & RTF_HOST) == 0)
+		return;
+	if (cmd == RTM_DELETE) {
+		while (rt->rt_llinfo)
+			x25_lxfree((struct llinfo *)rt->rt_llinfo);
+		x25_rtinvert(RTM_DELETE, rt->rt_gateway, rt);
+		return;
+	}
+	if (lx == 0 && (lx = x25_lxalloc(rt)) == 0)
+		return;
+	if ((lcp = lx->lx_lcd) && lcp->lcd_state != READY) {
+		/*
+		 * This can only happen on a RTM_CHANGE operation
+		 * though cmd will be RTM_ADD.
+		 */
+		if (lcp->lcd_ceaddr &&
+		    Bcmp(rt->rt_gateway, lcp->lcd_ceaddr,
+					 lcp->lcd_ceaddr->x25_len) != 0) {
+			x25_rtinvert(RTM_DELETE, lcp->lcd_ceaddr, rt);
+			lcp->lcd_upper = 0;
+			pk_disconnect(lcp);
+		}
+		lcp = 0;
+	}
+	x25_rtinvert(RTM_ADD, rt->rt_gateway, rt);
+}
+
+int x25_dont_rtinvert = 0;
+
+x25_rtinvert(cmd, sa, rt)
+register struct sockaddr *sa;
+register struct rtentry *rt;
+{
+	struct rtentry *rt2 = 0;
+	/*
+	 * rt_gateway contains PID indicating which proto
+	 * family on the other end, so will be different
+	 * from general host route via X.25.
+	 */
+	if (rt->rt_ifp->if_type == IFT_X25DDN || x25_dont_rtinvert)
+		return;
+	if (sa->sa_family != AF_CCITT)
+		return;
+	if (cmd != RTM_DELETE) {
+		rtrequest(RTM_ADD, sa, rt_key(rt), x25_dgram_sockmask,
+				RTF_PROTO2, &rt2);
+		if (rt2) {
+			rt2->rt_llinfo = (caddr_t) rt;
+			rt->rt_refcnt++;
+		}
+		return;
+	}
+	rt2 = rt;
+	if ((rt = rtalloc1(sa, 0)) == 0 ||
+	    (rt->rt_flags & RTF_PROTO2) == 0 ||
+	    rt->rt_llinfo != (caddr_t)rt2) {
+		printf("x25_rtchange: inverse route screwup\n");
+		return;
+	} else
+		rt2->rt_refcnt--;
+	rtrequest(RTM_DELETE, sa, rt_key(rt2), x25_dgram_sockmask,
+				0, (struct rtentry **) 0);
+}
+
+static struct sockaddr_x25 blank_x25 = {sizeof blank_x25, AF_CCITT};
+/*
+ * IP to X25 address routine copyright ACC, used by permission.
+ */
+union imp_addr {
+	struct in_addr  ip;
+	struct imp {
+		u_char		s_net;
+		u_char		s_host;
+		u_char		s_lh;
+		u_char		s_impno;
+	}		    imp;
+};
+
+/*
+ * The following is totally bogus and here only to preserve
+ * the IP to X.25 translation.
+ */
+x25_ddnip_to_ccitt(src, rt)
+struct sockaddr_in *src;
+register struct rtentry *rt;
+{
+	register struct sockaddr_x25 *dst = (struct sockaddr_x25 *)rt->rt_gateway;
+	union imp_addr imp_addr;
+	int             imp_no, imp_port, temp;
+	char *x25addr = dst->x25_addr;
+
+
+	imp_addr.ip = src->sin_addr;
+	*dst = blank_x25;
+	if ((imp_addr.imp.s_net & 0x80) == 0x00) {	/* class A */
+	    imp_no = imp_addr.imp.s_impno;
+	    imp_port = imp_addr.imp.s_host;
+	} else if ((imp_addr.imp.s_net & 0xc0) == 0x80) {	/* class B */
+	    imp_no = imp_addr.imp.s_impno;
+	    imp_port = imp_addr.imp.s_lh;
+	} else {		/* class C */
+	    imp_no = imp_addr.imp.s_impno / 32;
+	    imp_port = imp_addr.imp.s_impno % 32;
+	}
+
+	x25addr[0] = 12; /* length */
+	/* DNIC is cleared by struct copy above */
+
+	if (imp_port < 64) {	/* Physical:  0000 0 IIIHH00 [SS] *//* s_impno
+				 *  -> III, s_host -> HH */
+	    x25addr[5] = 0;	/* set flag bit */
+	    x25addr[6] = imp_no / 100;
+	    x25addr[7] = (imp_no % 100) / 10;
+	    x25addr[8] = imp_no % 10;
+	    x25addr[9] = imp_port / 10;
+	    x25addr[10] = imp_port % 10;
+	} else {		/* Logical:   0000 1 RRRRR00 [SS]	 *//* s
+				 * _host * 256 + s_impno -> RRRRR */
+	    temp = (imp_port << 8) + imp_no;
+	    x25addr[5] = 1;
+	    x25addr[6] = temp / 10000;
+	    x25addr[7] = (temp % 10000) / 1000;
+	    x25addr[8] = (temp % 1000) / 100;
+	    x25addr[9] = (temp % 100) / 10;
+	    x25addr[10] = temp % 10;
+	}
+}
+
+/*
+ * This routine is a sketch and is not to be believed!!!!!
+ *
+ * This is a utility routine to be called by x25 devices when a
+ * call request is honored with the intent of starting datagram forwarding.
+ */
+x25_dg_rtinit(dst, ia, af)
+struct sockaddr_x25 *dst;
+register struct x25_ifaddr *ia;
+{
+	struct sockaddr *sa = 0;
+	struct rtentry *rt;
+	struct in_addr my_addr;
+	static struct sockaddr_in sin = {sizeof(sin), AF_INET};
+
+	if (ia->ia_ifp->if_type == IFT_X25DDN && af == AF_INET) {
+	/*
+	 * Inverse X25 to IP mapping copyright and courtesy ACC.
+	 */
+		int             imp_no, imp_port, temp;
+		union imp_addr imp_addr;
+	    {
+		/*
+		 * First determine our IP addr for network
+		 */
+		register struct in_ifaddr *ina;
+
+		for (ina = in_ifaddr.tqh_first; ina != 0;
+		    ina = ina->ia_list.tqe_next)
+			if (ina->ia_ifp == ia->ia_ifp) {
+				my_addr = ina->ia_addr.sin_addr;
+				break;
+			}
+	    }
+	    {
+
+		register char *x25addr = dst->x25_addr;
+
+		switch (x25addr[5] & 0x0f) {
+		  case 0:	/* Physical:  0000 0 IIIHH00 [SS]	 */
+		    imp_no =
+			((int) (x25addr[6] & 0x0f) * 100) +
+			((int) (x25addr[7] & 0x0f) * 10) +
+			((int) (x25addr[8] & 0x0f));
+
+
+		    imp_port =
+			((int) (x25addr[9] & 0x0f) * 10) +
+			((int) (x25addr[10] & 0x0f));
+		    break;
+		  case 1:	/* Logical:   0000 1 RRRRR00 [SS]	 */
+		    temp = ((int) (x25addr[6] & 0x0f) * 10000)
+			+ ((int) (x25addr[7] & 0x0f) * 1000)
+			+ ((int) (x25addr[8] & 0x0f) * 100)
+			+ ((int) (x25addr[9] & 0x0f) * 10)
+			+ ((int) (x25addr[10] & 0x0f));
+
+		    imp_port = temp >> 8;
+		    imp_no = temp & 0xff;
+		    break;
+		  default:
+		    return (0L);
+		}
+		imp_addr.ip = my_addr;
+		if ((imp_addr.imp.s_net & 0x80) == 0x00) {
+		/* class A */
+		    imp_addr.imp.s_host = imp_port;
+		    imp_addr.imp.s_impno = imp_no;
+		    imp_addr.imp.s_lh = 0;
+		} else if ((imp_addr.imp.s_net & 0xc0) == 0x80) {
+		/* class B */
+		    imp_addr.imp.s_lh = imp_port;
+		    imp_addr.imp.s_impno = imp_no;
+		} else {
+		/* class C */
+		    imp_addr.imp.s_impno = (imp_no << 5) + imp_port;
+		}
+	    }
+		sin.sin_addr = imp_addr.ip;
+		sa = (struct sockaddr *)&sin;
+	} else {
+		/*
+		 * This uses the X25 routing table to do inverse
+		 * lookup of x25 address to sockaddr.
+		 */
+		if (rt = rtalloc1(SA(dst), 0)) {
+			sa = rt->rt_gateway;
+			rt->rt_refcnt--;
+		}
+	}
+	/* 
+	 * Call to rtalloc1 will create rtentry for reverse path
+	 * to callee by virtue of cloning magic and will allocate
+	 * space for local control block.
+	 */
+	if (sa && (rt = rtalloc1(sa, 1)))
+		rt->rt_refcnt--;
+}
+int x25_startproto = 1;
+
+pk_init()
+{
+	/*
+	 * warning, sizeof (struct sockaddr_x25) > 32,
+	 * but contains no data of interest beyond 32
+	 */
+	if (x25_startproto) {
+		pk_protolisten(0xcc, 1, x25_dgram_incoming);
+		pk_protolisten(0x81, 1, x25_dgram_incoming);
+	}
+}
+
+struct x25_dgproto {
+	u_char spi;
+	u_char spilen;
+	int (*f)();
+} x25_dgprototab[] = {
+#if defined(ISO) && defined(TPCONS)
+{ 0x0, 0, tp_incoming},
+#endif
+{ 0xcc, 1, x25_dgram_incoming},
+{ 0xcd, 1, x25_dgram_incoming},
+{ 0x81, 1, x25_dgram_incoming},
+};
+
+pk_user_protolisten(info)
+register u_char *info;
+{
+	register struct x25_dgproto *dp = x25_dgprototab
+		    + ((sizeof x25_dgprototab) / (sizeof *dp));
+	register struct pklcd *lcp;
+	
+	while (dp > x25_dgprototab)
+		if ((--dp)->spi == info[0])
+			goto gotspi;
+	return ESRCH;
+
+gotspi:	if (info[1])
+		return pk_protolisten(dp->spi, dp->spilen, dp->f);
+	for (lcp = pk_listenhead; lcp; lcp = lcp->lcd_listen)
+		if (lcp->lcd_laddr.x25_udlen == dp->spilen &&
+		    Bcmp(&dp->spi, lcp->lcd_laddr.x25_udata, dp->spilen) == 0) {
+			pk_disconnect(lcp);
+			return 0;
+		}
+	return ESRCH;
+}
+
+/*
+ * This routine transfers an X.25 circuit to or from a routing entry.
+ * If the supplied circuit is * in DATA_TRANSFER state, it is added to the
+ * routing entry.  If freshly allocated, it glues back the vc from
+ * the rtentry to the socket.
+ */
+pk_rtattach(so, m0)
+register struct socket *so;
+struct mbuf *m0;
+{
+	register struct pklcd *lcp = (struct pklcd *)so->so_pcb;
+	register struct mbuf *m = m0;
+	struct sockaddr *dst = mtod(m, struct sockaddr *);
+	register struct rtentry *rt = rtalloc1(dst, 0);
+	register struct llinfo_x25 *lx;
+	caddr_t cp;
+#define ROUNDUP(a) \
+	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+#define transfer_sockbuf(s, f, l) \
+	while (m = (s)->sb_mb)\
+		{(s)->sb_mb = m->m_act; m->m_act = 0; sbfree((s), m); f(l, m);}
+
+	if (rt)
+		rt->rt_refcnt--;
+	cp = (dst->sa_len < m->m_len) ? ROUNDUP(dst->sa_len) + (caddr_t)dst : 0;
+	while (rt &&
+	       ((cp == 0 && rt_mask(rt) != 0) ||
+		(cp != 0 && (rt_mask(rt) == 0 ||
+			     Bcmp(cp, rt_mask(rt), rt_mask(rt)->sa_len)) != 0)))
+			rt = (struct rtentry *)rt->rt_nodes->rn_dupedkey;
+	if (rt == 0 || (rt->rt_flags & RTF_GATEWAY) ||
+	    (lx = (struct llinfo_x25 *)rt->rt_llinfo) == 0)
+		return ESRCH;
+	if (lcp == 0)
+		return ENOTCONN;
+	switch (lcp->lcd_state) {
+	default:
+		return ENOTCONN;
+
+	case READY:
+		/* Detach VC from rtentry */
+		if (lx->lx_lcd == 0)
+			return ENOTCONN;
+		lcp->lcd_so = 0;
+		pk_close(lcp);
+		lcp = lx->lx_lcd;
+		if (lx->lx_list.le_next->lx_rt == rt)
+			x25_lxfree(lx);
+		lcp->lcd_so = so;
+		lcp->lcd_upper = 0;
+		lcp->lcd_upnext = 0;
+		transfer_sockbuf(&lcp->lcd_sb, sbappendrecord, &so->so_snd);
+		soisconnected(so);
+		return 0;
+
+	case DATA_TRANSFER:
+		/* Add VC to rtentry */
+		lcp->lcd_so = 0;
+		lcp->lcd_sb = so->so_snd; /* structure copy */
+		bzero((caddr_t)&so->so_snd, sizeof(so->so_snd)); /* XXXXXX */
+		so->so_pcb = 0;
+		x25_rtattach(lcp, rt);
+		transfer_sockbuf(&so->so_rcv, x25_ifinput, lcp);
+		soisdisconnected(so);
+	}
+	return 0;
+}
+x25_rtattach(lcp0, rt)
+register struct pklcd *lcp0;
+struct rtentry *rt;
+{
+	register struct llinfo_x25 *lx = (struct llinfo_x25 *)rt->rt_llinfo;
+	register struct pklcd *lcp;
+	register struct mbuf *m;
+	if (lcp = lx->lx_lcd) { /* adding an additional VC */
+		if (lcp->lcd_state == READY) {
+			transfer_sockbuf(&lcp->lcd_sb, pk_output, lcp0);
+			lcp->lcd_upper = 0;
+			pk_close(lcp);
+		} else {
+			lx = x25_lxalloc(rt);
+			if (lx == 0)
+				return ENOBUFS;
+		}
+	}
+	lx->lx_lcd = lcp = lcp0;
+	lcp->lcd_upper = x25_ifinput;
+	lcp->lcd_upnext = (caddr_t)lx;
+}