77f82e3b7c
Avoid implicit function calls by adding the proper include files. Use const char copyright. Fix some fprint formatting. In the manual page: Use the .Pa macro for filenames and locations. Kill hard setence breaks. Make use of the .Tn and .Dq macros. Add some to text to the otherwise blank HISTORY section (taken from CVS).
305 lines
8.8 KiB
C
305 lines
8.8 KiB
C
/*
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Copyright (c) 1995 John Hay. All rights reserved.
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*
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* This file includes significant work done at Cornell University by
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* Bill Nesheim. That work included by permission.
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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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* $FreeBSD$
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*/
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#ifndef lint
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static const char sccsid[] = "@(#)input.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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/*
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* IPX Routing Table Management Daemon
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*/
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#include "defs.h"
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struct sockaddr *
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ipx_nettosa(net)
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union ipx_net net;
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{
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static struct sockaddr_ipx sxn;
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bzero(&sxn, sizeof (struct sockaddr_ipx));
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sxn.sipx_family = AF_IPX;
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sxn.sipx_len = sizeof (sxn);
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sxn.sipx_addr.x_net = net;
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return( (struct sockaddr *)&sxn);
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}
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/*
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* Process a newly received packet.
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*/
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void
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rip_input(from, size)
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struct sockaddr *from;
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int size;
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{
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int newsize;
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int rtchanged = 0;
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struct rt_entry *rt;
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struct netinfo *n;
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struct interface *ifp = 0;
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struct afswitch *afp;
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struct sockaddr_ipx *ipxp;
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ifp = if_ifwithnet(from);
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ipxp = (struct sockaddr_ipx *)from;
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if (ifp == 0) {
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if(ftrace) {
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fprintf(ftrace, "Received bogus packet from %s\n",
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ipxdp_ntoa(&ipxp->sipx_addr));
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}
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return;
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}
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TRACE_INPUT(ifp, from, size);
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if (from->sa_family >= AF_MAX)
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return;
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afp = &afswitch[from->sa_family];
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size -= sizeof (u_short) /* command */;
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n = msg->rip_nets;
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switch (ntohs(msg->rip_cmd)) {
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case RIPCMD_REQUEST:
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if (ipx_hosteq(satoipx_addr(ifp->int_addr), ipxp->sipx_addr))
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return;
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newsize = 0;
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while (size > 0) {
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if (size < sizeof (struct netinfo))
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break;
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size -= sizeof (struct netinfo);
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/*
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* A single entry with rip_dst == DSTNETS_ALL and
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* metric ``infinity'' means ``all routes''.
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*
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* XXX According to the IPX RIP spec the metric
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* and tick fields can be anything. So maybe we
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* should not check the metric???
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*/
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if (ipx_neteqnn(n->rip_dst, ipx_anynet) &&
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ntohs(n->rip_metric) == HOPCNT_INFINITY &&
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size == 0) {
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supply(from, 0, ifp, 0);
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return;
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}
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/*
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* request for specific nets
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*/
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rt = rtlookup(ipx_nettosa(n->rip_dst));
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if (ftrace) {
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fprintf(ftrace,
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"specific request for %s",
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ipxdp_nettoa(n->rip_dst));
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fprintf(ftrace,
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" yields route %lx\n",
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(u_long)rt);
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}
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/*
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* XXX We break out on the first net that isn't
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* found. The specs is a bit vague here. I'm not
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* sure what we should do.
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*/
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if (rt == 0)
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return;
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/* XXX
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* According to the spec we should not include
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* information about networks for which the number
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* of hops is 16.
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*/
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if (rt->rt_metric == (HOPCNT_INFINITY-1))
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return;
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n->rip_metric = htons( rt == 0 ? HOPCNT_INFINITY :
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min(rt->rt_metric+1, HOPCNT_INFINITY));
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n->rip_ticks = htons(rt->rt_ticks+1);
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/*
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* We use split horizon with a twist. If the requested
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* net is the directly connected net we supply an
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* answer. This is so that the host can learn about
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* the routers on its net.
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*/
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{
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register struct rt_entry *trt = rt;
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while (trt) {
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if ((trt->rt_ifp == ifp) &&
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!ipx_neteqnn(n->rip_dst,
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satoipx_addr(ifp->int_addr).x_net))
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return;
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trt = trt->rt_clone;
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}
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n++;
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newsize += sizeof (struct netinfo);
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}
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}
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if (newsize > 0) {
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msg->rip_cmd = htons(RIPCMD_RESPONSE);
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newsize += sizeof (u_short);
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/* should check for if with dstaddr(from) first */
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(*afp->af_output)(ripsock, 0, from, newsize);
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TRACE_OUTPUT(ifp, from, newsize);
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if (ftrace) {
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/* XXX This should not happen anymore. */
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if(ifp == 0)
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fprintf(ftrace, "--- ifp = 0\n");
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else
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fprintf(ftrace,
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"request arrived on interface %s\n",
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ifp->int_name);
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}
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}
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return;
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case RIPCMD_RESPONSE:
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/* verify message came from a router */
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if ((*afp->af_portmatch)(from) == 0)
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return;
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(*afp->af_canon)(from);
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/* are we talking to ourselves? */
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if ((ifp = if_ifwithaddr(from)) != 0) {
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rt = rtfind(from);
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if (rt == 0 || (rt->rt_state & RTS_INTERFACE) == 0) {
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addrouteforif(ifp);
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rtchanged = 1;
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} else
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rt->rt_timer = 0;
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return;
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}
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/* Update timer for interface on which the packet arrived.
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* If from other end of a point-to-point link that isn't
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* in the routing tables, (re-)add the route.
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*/
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if ((rt = rtfind(from)) && (rt->rt_state & RTS_INTERFACE)) {
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if(ftrace) fprintf(ftrace, "Got route\n");
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rt->rt_timer = 0;
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} else if ((ifp = if_ifwithdstaddr(from)) != 0) {
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if(ftrace) fprintf(ftrace, "Got partner\n");
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addrouteforif(ifp);
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rtchanged = 1;
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}
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for (; size > 0; size -= sizeof (struct netinfo), n++) {
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struct sockaddr *sa;
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if (size < sizeof (struct netinfo))
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break;
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if ((unsigned) ntohs(n->rip_metric) > HOPCNT_INFINITY)
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continue;
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rt = rtfind(sa = ipx_nettosa(n->rip_dst));
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if (rt == 0) {
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if (ntohs(n->rip_metric) == HOPCNT_INFINITY)
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continue;
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rtadd(sa, from, ntohs(n->rip_metric),
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ntohs(n->rip_ticks), 0);
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rtchanged = 1;
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continue;
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}
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/*
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* A clone is a different route to the same net
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* with exactly the same cost (ticks and metric).
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* They must all be recorded because those interfaces
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* must be handled in the same way as the first route
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* to that net. ie When using the split horizon
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* algorithm we must look at these interfaces also.
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*
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* Update if from gateway and different,
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* from anywhere and less ticks or
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* if same ticks and shorter,
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* or getting stale and equivalent.
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*/
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if (!equal(from, &rt->rt_router) &&
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ntohs(n->rip_ticks) == rt->rt_ticks &&
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ntohs(n->rip_metric) == rt->rt_metric &&
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ntohs(n->rip_metric) != HOPCNT_INFINITY) {
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register struct rt_entry *trt = rt->rt_clone;
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while (trt) {
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if (equal(from, &trt->rt_router)) {
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trt->rt_timer = 0;
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break;
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}
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trt = trt->rt_clone;
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}
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if (trt == NULL) {
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rtadd_clone(rt, sa, from,
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ntohs(n->rip_metric),
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ntohs(n->rip_ticks), 0);
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}
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continue;
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}
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if ((equal(from, &rt->rt_router) &&
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((ntohs(n->rip_ticks) != rt->rt_ticks) ||
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(ntohs(n->rip_metric) != rt->rt_metric))) ||
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(ntohs(n->rip_ticks) < rt->rt_ticks) ||
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((ntohs(n->rip_ticks) == rt->rt_ticks) &&
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(ntohs(n->rip_metric) < rt->rt_metric)) ||
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(rt->rt_timer > (EXPIRE_TIME*2/3) &&
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rt->rt_metric == ntohs(n->rip_metric) &&
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ntohs(n->rip_metric) != HOPCNT_INFINITY)) {
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rtchange(rt, from, ntohs(n->rip_metric),
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ntohs(n->rip_ticks));
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if (ntohs(n->rip_metric) == HOPCNT_INFINITY)
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rt->rt_timer = EXPIRE_TIME;
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else
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rt->rt_timer = 0;
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rtchanged = 1;
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} else if (equal(from, &rt->rt_router) &&
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(ntohs(n->rip_ticks) == rt->rt_ticks) &&
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(ntohs(n->rip_metric) == rt->rt_metric) &&
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(ntohs(n->rip_metric) != HOPCNT_INFINITY)) {
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rt->rt_timer = 0;
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}
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}
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if (rtchanged) {
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register struct rthash *rh;
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register struct rt_entry *rt;
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toall(supply, NULL, 1);
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for (rh = nethash; rh < &nethash[ROUTEHASHSIZ]; rh++)
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for (rt = rh->rt_forw;
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rt != (struct rt_entry *)rh;
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rt = rt->rt_forw)
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rt->rt_state &= ~RTS_CHANGED;
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}
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return;
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}
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}
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