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- /*
- * Copyright (c) 1983, 1988 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.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)output.c 5.15 (Berkeley) 2/28/91";
- #endif /* not lint */
-
- /*
- * Routing Table Management Daemon
- */
- #include "defs.h"
-
- /*
- * Apply the function "f" to all non-passive
- * interfaces. If the interface supports the
- * use of broadcasting use it, otherwise address
- * the output to the known router.
- */
- toall(f, rtstate, skipif)
- int (*f)();
- int rtstate;
- struct interface *skipif;
- {
- register struct interface *ifp;
- register struct sockaddr *dst;
- register int flags;
- extern struct interface *ifnet;
-
- for (ifp = ifnet; ifp; ifp = ifp->int_next) {
- if (ifp->int_flags & IFF_PASSIVE || ifp == skipif)
- continue;
- dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
- ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
- &ifp->int_addr;
- flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
- (*f)(dst, flags, ifp, rtstate);
- }
- }
-
- /*
- * Output a preformed packet.
- */
- /*ARGSUSED*/
- sndmsg(dst, flags, ifp, rtstate)
- struct sockaddr *dst;
- int flags;
- struct interface *ifp;
- int rtstate;
- {
-
- (*afswitch[dst->sa_family].af_output)(s, flags,
- dst, sizeof (struct rip));
- TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
- }
-
- /*
- * Supply dst with the contents of the routing tables.
- * If this won't fit in one packet, chop it up into several.
- */
- supply(dst, flags, ifp, rtstate)
- struct sockaddr *dst;
- int flags;
- register struct interface *ifp;
- int rtstate;
- {
- register struct rt_entry *rt;
- register struct netinfo *n = msg->rip_nets;
- register struct rthash *rh;
- struct rthash *base = hosthash;
- int doinghost = 1, size;
- int (*output)() = afswitch[dst->sa_family].af_output;
- int (*sendroute)() = afswitch[dst->sa_family].af_sendroute;
- int npackets = 0;
-
- msg->rip_cmd = RIPCMD_RESPONSE;
- msg->rip_vers = RIPVERSION;
- bzero(msg->rip_res1, sizeof(msg->rip_res1));
- again:
- for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
- for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
- /*
- * Don't resend the information on the network
- * from which it was received (unless sending
- * in response to a query).
- */
- if (ifp && rt->rt_ifp == ifp &&
- (rt->rt_state & RTS_INTERFACE) == 0)
- continue;
- if (rt->rt_state & RTS_EXTERNAL)
- continue;
- /*
- * For dynamic updates, limit update to routes
- * with the specified state.
- */
- if (rtstate && (rt->rt_state & rtstate) == 0)
- continue;
- /*
- * Limit the spread of subnet information
- * to those who are interested.
- */
- if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
- if (rt->rt_dst.sa_family != dst->sa_family)
- continue;
- if ((*sendroute)(rt, dst) == 0)
- continue;
- }
- size = (char *)n - packet;
- if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
- TRACE_OUTPUT(ifp, dst, size);
- (*output)(s, flags, dst, size);
- /*
- * If only sending to ourselves,
- * one packet is enough to monitor interface.
- */
- if (ifp && (ifp->int_flags &
- (IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0)
- return;
- n = msg->rip_nets;
- npackets++;
- }
- n->rip_dst = rt->rt_dst;
- #if BSD < 198810
- if (sizeof(n->rip_dst.sa_family) > 1) /* XXX */
- n->rip_dst.sa_family = htons(n->rip_dst.sa_family);
- #else
- #define osa(x) ((struct osockaddr *)(&(x)))
- osa(n->rip_dst)->sa_family = htons(n->rip_dst.sa_family);
- #endif
- n->rip_metric = htonl(rt->rt_metric);
- n++;
- }
- if (doinghost) {
- doinghost = 0;
- base = nethash;
- goto again;
- }
- if (n != msg->rip_nets || (npackets == 0 && rtstate == 0)) {
- size = (char *)n - packet;
- TRACE_OUTPUT(ifp, dst, size);
- (*output)(s, flags, dst, size);
- }
- }
-