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3219c922a9
Note: The sources for XNSrouted and routed are being imported to usr.sbin instead of sbin.
173 lines
5.3 KiB
C
173 lines
5.3 KiB
C
/*
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* Copyright (c) 1983, 1988, 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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#ifndef lint
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static char sccsid[] = "@(#)output.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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/*
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* Routing Table Management Daemon
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*/
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#include "defs.h"
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/*
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* Apply the function "f" to all non-passive
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* interfaces. If the interface supports the
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* use of broadcasting use it, otherwise address
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* the output to the known router.
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*/
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toall(f, rtstate, skipif)
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int (*f)();
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int rtstate;
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struct interface *skipif;
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{
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register struct interface *ifp;
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register struct sockaddr *dst;
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register int flags;
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extern struct interface *ifnet;
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for (ifp = ifnet; ifp; ifp = ifp->int_next) {
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if (ifp->int_flags & IFF_PASSIVE || ifp == skipif)
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continue;
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dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
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ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
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&ifp->int_addr;
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flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
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(*f)(dst, flags, ifp, rtstate);
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}
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}
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/*
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* Output a preformed packet.
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*/
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/*ARGSUSED*/
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sndmsg(dst, flags, ifp, rtstate)
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struct sockaddr *dst;
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int flags;
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struct interface *ifp;
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int rtstate;
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{
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(*afswitch[dst->sa_family].af_output)(s, flags,
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dst, sizeof (struct rip));
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TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
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}
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/*
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* Supply dst with the contents of the routing tables.
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* If this won't fit in one packet, chop it up into several.
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*/
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supply(dst, flags, ifp, rtstate)
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struct sockaddr *dst;
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int flags;
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register struct interface *ifp;
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int rtstate;
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{
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register struct rt_entry *rt;
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register struct netinfo *n = msg->rip_nets;
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register struct rthash *rh;
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struct rthash *base = hosthash;
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int doinghost = 1, size;
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int (*output)() = afswitch[dst->sa_family].af_output;
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int (*sendroute)() = afswitch[dst->sa_family].af_sendroute;
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int npackets = 0;
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msg->rip_cmd = RIPCMD_RESPONSE;
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msg->rip_vers = RIPVERSION;
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bzero(msg->rip_res1, sizeof(msg->rip_res1));
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again:
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for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
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for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
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/*
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* Don't resend the information on the network
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* from which it was received (unless sending
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* in response to a query).
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*/
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if (ifp && rt->rt_ifp == ifp &&
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(rt->rt_state & RTS_INTERFACE) == 0)
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continue;
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if (rt->rt_state & RTS_EXTERNAL)
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continue;
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/*
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* For dynamic updates, limit update to routes
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* with the specified state.
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*/
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if (rtstate && (rt->rt_state & rtstate) == 0)
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continue;
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/*
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* Limit the spread of subnet information
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* to those who are interested.
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*/
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if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
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if (rt->rt_dst.sa_family != dst->sa_family)
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continue;
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if ((*sendroute)(rt, dst) == 0)
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continue;
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}
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size = (char *)n - packet;
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if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
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TRACE_OUTPUT(ifp, dst, size);
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(*output)(s, flags, dst, size);
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/*
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* If only sending to ourselves,
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* one packet is enough to monitor interface.
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*/
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if (ifp && (ifp->int_flags &
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(IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0)
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return;
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n = msg->rip_nets;
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npackets++;
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}
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n->rip_dst = rt->rt_dst;
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#if BSD < 198810
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if (sizeof(n->rip_dst.sa_family) > 1) /* XXX */
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n->rip_dst.sa_family = htons(n->rip_dst.sa_family);
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#else
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#define osa(x) ((struct osockaddr *)(&(x)))
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osa(n->rip_dst)->sa_family = htons(n->rip_dst.sa_family);
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#endif
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n->rip_metric = htonl(rt->rt_metric);
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n++;
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}
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if (doinghost) {
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doinghost = 0;
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base = nethash;
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goto again;
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}
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if (n != msg->rip_nets || (npackets == 0 && rtstate == 0)) {
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size = (char *)n - packet;
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TRACE_OUTPUT(ifp, dst, size);
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(*output)(s, flags, dst, size);
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}
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}
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