159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/*
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* Copyright (c) 1984, 1985, 1986, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ns_output.c 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netns/ns.h>
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#include <netns/ns_if.h>
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#include <netns/idp.h>
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#include <netns/idp_var.h>
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int ns_hold_output = 0;
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int ns_copy_output = 0;
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int ns_output_cnt = 0;
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struct mbuf *ns_lastout;
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ns_output(m0, ro, flags)
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struct mbuf *m0;
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struct route *ro;
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int flags;
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{
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register struct idp *idp = mtod(m0, struct idp *);
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register struct ifnet *ifp = 0;
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int error = 0;
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struct route idproute;
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struct sockaddr_ns *dst;
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extern int idpcksum;
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if (ns_hold_output) {
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if (ns_lastout) {
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(void)m_free(ns_lastout);
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}
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ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
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}
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/*
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* Route packet.
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*/
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if (ro == 0) {
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ro = &idproute;
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bzero((caddr_t)ro, sizeof (*ro));
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}
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dst = (struct sockaddr_ns *)&ro->ro_dst;
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if (ro->ro_rt == 0) {
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dst->sns_family = AF_NS;
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dst->sns_len = sizeof (*dst);
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dst->sns_addr = idp->idp_dna;
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dst->sns_addr.x_port = 0;
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/*
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* If routing to interface only,
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* short circuit routing lookup.
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*/
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if (flags & NS_ROUTETOIF) {
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struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
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if (ia == 0) {
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error = ENETUNREACH;
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goto bad;
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}
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ifp = ia->ia_ifp;
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goto gotif;
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}
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rtalloc(ro);
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} else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
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/*
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* The old route has gone away; try for a new one.
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*/
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rtfree(ro->ro_rt);
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ro->ro_rt = NULL;
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rtalloc(ro);
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}
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if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
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error = ENETUNREACH;
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goto bad;
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}
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ro->ro_rt->rt_use++;
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if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
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dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
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gotif:
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/*
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* Look for multicast addresses and
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* and verify user is allowed to send
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* such a packet.
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*/
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if (dst->sns_addr.x_host.c_host[0]&1) {
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if ((ifp->if_flags & IFF_BROADCAST) == 0) {
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error = EADDRNOTAVAIL;
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goto bad;
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}
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if ((flags & NS_ALLOWBROADCAST) == 0) {
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error = EACCES;
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goto bad;
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}
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}
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if (htons(idp->idp_len) <= ifp->if_mtu) {
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ns_output_cnt++;
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if (ns_copy_output) {
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ns_watch_output(m0, ifp);
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}
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error = (*ifp->if_output)(ifp, m0,
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(struct sockaddr *)dst, ro->ro_rt);
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goto done;
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} else error = EMSGSIZE;
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bad:
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if (ns_copy_output) {
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ns_watch_output(m0, ifp);
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}
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m_freem(m0);
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done:
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if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
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RTFREE(ro->ro_rt);
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ro->ro_rt = 0;
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}
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return (error);
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}
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