2 * Copyright (c) 1995 John Hay. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by John Hay.
15 * 4. Neither the name of the author nor the names of any co-contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY John Hay AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL John Hay OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $FreeBSD: src/usr.sbin/IPXrouted/sap_input.c,v 1.7 1999/08/28 01:15:04 peter Exp $
35 * IPX Routing Table Management Daemon
42 * Process a newly received packet.
45 sap_input(struct sockaddr *from, int size)
49 struct sap_entry *sap;
51 struct interface *ifp = NULL;
53 struct sockaddr_ipx *ipxp;
55 ifp = if_ifwithnet(from);
56 ipxp = (struct sockaddr_ipx *)from;
59 fprintf(ftrace, "Received bogus packet from %s\n",
60 ipxdp_ntoa(&ipxp->sipx_addr));
66 dumpsappacket(ftrace, "received", from, (char *)sap_msg , size);
68 if (from->sa_family >= AF_MAX)
70 afp = &afswitch[from->sa_family];
72 size -= sizeof (u_short) /* command */;
75 switch (ntohs(sap_msg->sap_cmd)) {
79 fprintf(ftrace, "Received a sap REQ_NEAR packet.\n");
82 sap = sap_nearestserver(n->ServType, ifp);
85 sap_msg->sap_cmd = htons(SAP_RESP_NEAR);
87 n->hops = htons(ntohs(n->hops) + 1);
88 if (ntohs(n->hops) >= HOPCNT_INFINITY)
91 newsize = sizeof(struct sap_info) + sizeof(struct sap_packet);
92 (*afp->af_output)(sapsock, 0, from, newsize);
94 fprintf(ftrace, "sap_nearestserver %X %s returned:\n",
97 fprintf(ftrace, " service %04X %-20.20s "
98 "addr %s.%04X metric %d\n",
99 ntohs(sap->sap.ServType),
101 ipxdp_ntoa(&sap->sap.ipx),
102 ntohs(sap->sap.ipx.x_port),
103 ntohs(sap->sap.hops));
109 fprintf(ftrace, "Received a sap REQ packet.\n");
111 sap_supply(from, 0, ifp, n->ServType, 0);
115 /* XXX We do nothing here, for the moment.
116 * Maybe we should check if the service is in our table?
120 fprintf(ftrace, "Received a sap RESP_NEAR packet.\n");
126 fprintf(ftrace, "Received a sap RESP packet.\n");
128 (*afp->af_canon)(from);
130 for (; size > 0; size -= sizeof (struct sap_info), n++) {
131 if (size < sizeof (struct netinfo))
134 * The idea here is that if the hop count is more
135 * than INFINITY it is bogus and should be discarded.
136 * If it is equal to INFINITY it is a message to say
137 * that a service went down. If we don't allready
138 * have it in our tables discard it. Otherwise
139 * update our table and set the timer to EXPIRE_TIME
140 * so that it is removed next time we go through the
143 if (ntohs(n->hops) > HOPCNT_INFINITY)
145 sap = sap_lookup(n->ServType, n->ServName);
147 if (ntohs(n->hops) == HOPCNT_INFINITY)
155 * A clone is a different route to the same service
156 * with exactly the same cost (metric).
157 * They must all be recorded because those interfaces
158 * must be handled in the same way as the first route
159 * to that service. ie When using the split horizon
160 * algorithm we must look at these interfaces also.
162 * Update if from gateway and different,
163 * from anywhere and less hops or
164 * getting stale and equivalent.
166 if (((ifp != sap->ifp) ||
167 !equal(&sap->source, from)) &&
168 (n->hops == sap->sap.hops) &&
169 (ntohs(n->hops) != HOPCNT_INFINITY)) {
170 struct sap_entry *tsap = sap->clone;
173 if ((ifp == tsap->ifp) &&
174 equal(&tsap->source, from)) {
181 sap_add_clone(sap, n, from);
185 if ((ifp == sap->ifp) &&
186 equal(&sap->source, from) &&
187 (ntohs(n->hops) == ntohs(sap->sap.hops)))
189 else if (((ifp == sap->ifp) &&
190 equal(&sap->source, from) &&
191 (n->hops != sap->sap.hops)) ||
192 (ntohs(n->hops) < ntohs(sap->sap.hops)) ||
193 (sap->timer > (EXPIRE_TIME*2/3) &&
194 ntohs(sap->sap.hops) == ntohs(n->hops) &&
195 ntohs(n->hops) != HOPCNT_INFINITY)) {
196 sap_change(sap, n, from);
201 struct sap_entry *sap;
205 for (sh = sap_head; sh < &sap_head[SAPHASHSIZ]; sh++)
207 sap != (struct sap_entry *)sh;
209 sap->state &= ~RTS_CHANGED;