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- /*
- * Copyright (c) 1984, 1985, 1986, 1987 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.
- *
- * @(#)ns_output.c 7.8 (Berkeley) 12/16/90
- */
-
- #include "param.h"
- #include "malloc.h"
- #include "mbuf.h"
- #include "errno.h"
- #include "socket.h"
- #include "socketvar.h"
-
- #include "../net/if.h"
- #include "../net/route.h"
-
- #include "ns.h"
- #include "ns_if.h"
- #include "idp.h"
- #include "idp_var.h"
-
- #ifdef vax
- #include "vax/include/mtpr.h"
- #endif
- int ns_hold_output = 0;
- int ns_copy_output = 0;
- int ns_output_cnt = 0;
- struct mbuf *ns_lastout;
-
- ns_output(m0, ro, flags)
- struct mbuf *m0;
- struct route *ro;
- int flags;
- {
- register struct idp *idp = mtod(m0, struct idp *);
- register struct ifnet *ifp = 0;
- int error = 0;
- struct route idproute;
- struct sockaddr_ns *dst;
- extern int idpcksum;
-
- if (ns_hold_output) {
- if (ns_lastout) {
- (void)m_free(ns_lastout);
- }
- ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
- }
- /*
- * Route packet.
- */
- if (ro == 0) {
- ro = &idproute;
- bzero((caddr_t)ro, sizeof (*ro));
- }
- dst = (struct sockaddr_ns *)&ro->ro_dst;
- if (ro->ro_rt == 0) {
- dst->sns_family = AF_NS;
- dst->sns_len = sizeof (*dst);
- dst->sns_addr = idp->idp_dna;
- dst->sns_addr.x_port = 0;
- /*
- * If routing to interface only,
- * short circuit routing lookup.
- */
- if (flags & NS_ROUTETOIF) {
- struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
-
- if (ia == 0) {
- error = ENETUNREACH;
- goto bad;
- }
- ifp = ia->ia_ifp;
- goto gotif;
- }
- rtalloc(ro);
- } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
- /*
- * The old route has gone away; try for a new one.
- */
- rtfree(ro->ro_rt);
- ro->ro_rt = NULL;
- rtalloc(ro);
- }
- if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
- error = ENETUNREACH;
- goto bad;
- }
- ro->ro_rt->rt_use++;
- if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
- dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
- gotif:
-
- /*
- * Look for multicast addresses and
- * and verify user is allowed to send
- * such a packet.
- */
- if (dst->sns_addr.x_host.c_host[0]&1) {
- if ((ifp->if_flags & IFF_BROADCAST) == 0) {
- error = EADDRNOTAVAIL;
- goto bad;
- }
- if ((flags & NS_ALLOWBROADCAST) == 0) {
- error = EACCES;
- goto bad;
- }
- }
-
- if (htons(idp->idp_len) <= ifp->if_mtu) {
- ns_output_cnt++;
- if (ns_copy_output) {
- ns_watch_output(m0, ifp);
- }
- error = (*ifp->if_output)(ifp, m0,
- (struct sockaddr *)dst, ro->ro_rt);
- goto done;
- } else error = EMSGSIZE;
-
-
- bad:
- if (ns_copy_output) {
- ns_watch_output(m0, ifp);
- }
- m_freem(m0);
- done:
- if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
- RTFREE(ro->ro_rt);
- ro->ro_rt = 0;
- }
- return (error);
- }
-