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_output.c,v 1.9 1999/08/28 01:15:04 peter Exp $
32 * $DragonFly: src/usr.sbin/IPXrouted/sap_output.c,v 1.2 2003/06/17 04:29:52 dillon Exp $
36 * Routing Table Management Daemon
42 * Apply the function "f" to all non-passive
43 * interfaces. If the interface supports the
44 * use of broadcasting use it, otherwise address
45 * the output to the known router.
48 sap_supply_toall(changesonly)
51 register struct interface *ifp;
53 register struct sockaddr_ipx *ipx_dst;
55 extern struct interface *ifnet;
57 ipx_dst = (struct sockaddr_ipx *)&dst;
59 for (ifp = ifnet; ifp; ifp = ifp->int_next) {
60 if (ifp->int_flags & IFF_PASSIVE)
63 dst = ifp->int_flags & IFF_BROADCAST ? ifp->int_broadaddr :
64 ifp->int_flags & IFF_POINTOPOINT ? ifp->int_dstaddr :
67 ipx_dst->sipx_addr.x_port = htons(IPXPORT_SAP);
69 flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
70 sap_supply(&dst, flags, ifp, SAP_WILDCARD, changesonly);
75 sapsndmsg(dst, flags, ifp, changesonly)
78 struct interface *ifp;
81 struct sockaddr t_dst;
82 struct sockaddr_ipx *ipx_dst;
85 ipx_dst = (struct sockaddr_ipx *)&t_dst;
87 if (ipx_dst->sipx_addr.x_port == 0)
88 ipx_dst->sipx_addr.x_port = htons(IPXPORT_SAP);
90 (*afswitch[dst->sa_family].af_output)
91 (sapsock, flags, &t_dst,
92 sizeof (struct sap_packet) + sizeof(u_short));
93 TRACE_SAP_OUTPUT(ifp, &t_dst,
94 sizeof (struct sap_packet) + sizeof(u_short));
98 * Supply dst with the contents of the SAP tables. If the ServType ==
99 * SAP_WILDCARD (0xFFFF) supply the whole table, otherwise only the
100 * services that are of ServType. If this won't fit in one packet, chop
101 * it up into several.
103 * This must be done using the split horizon algorithm.
104 * 1. Don't send SAP info to the interface from where it was received.
105 * 2. If a service is received from more than one interface and the cost is
106 * the same, don't publish it on either interface. I am calling this
110 sap_supply(dst, flags, ifp, ServType, changesonly)
111 struct sockaddr *dst;
113 struct interface *ifp;
117 register struct sap_entry *sap;
118 register struct sap_entry *csap; /* Clone route */
119 register struct sap_hash *sh;
120 register struct sap_info *n = sap_msg->sap;
121 struct sap_hash *base = sap_head;
122 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) dst;
123 af_output_t *output = afswitch[dst->sa_family].af_output;
127 if (sipx->sipx_port == 0)
128 sipx->sipx_port = htons(IPXPORT_SAP);
130 sap_msg->sap_cmd = ntohs(SAP_RESP);
132 for (sh = base; sh < &base[SAPHASHSIZ]; sh++)
133 for (sap = sh->forw; sap != (struct sap_entry *)sh; sap = sap->forw) {
134 size = (char *)n - (char *)sap_msg;
135 if (size >= ((MAXSAPENTRIES * sizeof (struct sap_info)) +
136 sizeof (sap_msg->sap_cmd))) {
137 (*output)(sapsock, flags, dst, size);
138 TRACE_SAP_OUTPUT(ifp, dst, size);
147 if (changesonly && !(sap->state & RTS_CHANGED))
151 * Check for the servicetype except if the ServType is
152 * a wildcard (0xFFFF).
154 if ((ServType != SAP_WILDCARD) &&
155 (ServType != sap->sap.ServType))
159 * This should do rule one and two of the split horizon
167 * Look if we have clones (different routes to the same
168 * place with exactly the same cost).
170 * We should not publish on any of the clone interfaces.
174 if (csap->ifp == ifp)
180 * Don't advertise services with more than 15 hops. It
181 * will be confused with a service that has gone down.
183 if (ntohs(sap->sap.hops) == (HOPCNT_INFINITY - 1))
185 metric = min(ntohs(sap->sap.hops) + 1, HOPCNT_INFINITY);
188 n->hops = htons(metric);
192 if (n != sap_msg->sap) {
193 size = (char *)n - (char *)sap_msg;
194 (*output)(sapsock, flags, dst, size);
195 TRACE_SAP_OUTPUT(ifp, dst, size);