sap_output.c revision 12268
111820Sjulian/* 211820Sjulian * Copyright (c) 1995 John Hay. All rights reserved. 311820Sjulian * 411820Sjulian * Redistribution and use in source and binary forms, with or without 511820Sjulian * modification, are permitted provided that the following conditions 611820Sjulian * are met: 711820Sjulian * 1. Redistributions of source code must retain the above copyright 811820Sjulian * notice, this list of conditions and the following disclaimer. 911820Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1011820Sjulian * notice, this list of conditions and the following disclaimer in the 1111820Sjulian * documentation and/or other materials provided with the distribution. 1211820Sjulian * 3. All advertising materials mentioning features or use of this software 1311820Sjulian * must display the following acknowledgement: 1411820Sjulian * This product includes software developed by John Hay. 1511820Sjulian * 4. Neither the name of the author nor the names of any co-contributors 1611820Sjulian * may be used to endorse or promote products derived from this software 1711820Sjulian * without specific prior written permission. 1811820Sjulian * 1911820Sjulian * THIS SOFTWARE IS PROVIDED BY John Hay AND CONTRIBUTORS ``AS IS'' AND 2011820Sjulian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2111820Sjulian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2211820Sjulian * ARE DISCLAIMED. IN NO EVENT SHALL John Hay OR CONTRIBUTORS BE LIABLE 2311820Sjulian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2411820Sjulian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2511820Sjulian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2611820Sjulian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2711820Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2811820Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2911820Sjulian * SUCH DAMAGE. 3011820Sjulian * 3112268Sjulian * $Id: sap_output.c,v 1.1 1995/10/26 21:28:24 julian Exp $ 3211820Sjulian */ 3311820Sjulian 3411820Sjulian/* 3511820Sjulian * Routing Table Management Daemon 3611820Sjulian */ 3711820Sjulian#include "defs.h" 3811820Sjulian 3911820Sjulian/* 4011820Sjulian * Apply the function "f" to all non-passive 4111820Sjulian * interfaces. If the interface supports the 4211820Sjulian * use of broadcasting use it, otherwise address 4311820Sjulian * the output to the known router. 4411820Sjulian */ 4511820Sjulianvoid 4611820Sjuliansap_supply_toall(void) 4711820Sjulian{ 4811820Sjulian register struct interface *ifp; 4911820Sjulian struct sockaddr dst; 5011820Sjulian register struct sockaddr_ipx *ipx_dst; 5111820Sjulian register int flags; 5211820Sjulian extern struct interface *ifnet; 5311820Sjulian 5411820Sjulian ipx_dst = (struct sockaddr_ipx *)&dst; 5511820Sjulian 5611820Sjulian for (ifp = ifnet; ifp; ifp = ifp->int_next) { 5711820Sjulian if (ifp->int_flags & IFF_PASSIVE) 5811820Sjulian continue; 5911820Sjulian 6011820Sjulian dst = ifp->int_flags & IFF_BROADCAST ? ifp->int_broadaddr : 6111820Sjulian ifp->int_flags & IFF_POINTOPOINT ? ifp->int_dstaddr : 6211820Sjulian ifp->int_addr; 6311820Sjulian 6412268Sjulian ipx_dst->sipx_addr.x_port = htons(IPXPORT_SAP); 6512268Sjulian 6611820Sjulian flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0; 6711820Sjulian sap_supply(&dst, flags, ifp, SAP_WILDCARD); 6811820Sjulian } 6911820Sjulian} 7011820Sjulian 7111820Sjulianvoid 7211820Sjuliansapsndmsg(dst, flags, ifp) 7311820Sjulian struct sockaddr *dst; 7411820Sjulian int flags; 7511820Sjulian struct interface *ifp; 7611820Sjulian{ 7711820Sjulian struct sockaddr t_dst; 7811820Sjulian struct sockaddr_ipx *ipx_dst; 7911820Sjulian 8011820Sjulian t_dst = *dst; 8111820Sjulian ipx_dst = (struct sockaddr_ipx *)&t_dst; 8211820Sjulian 8311820Sjulian if (ipx_dst->sipx_addr.x_port == 0) 8411820Sjulian ipx_dst->sipx_addr.x_port = htons(IPXPORT_SAP); 8511820Sjulian 8611820Sjulian (*afswitch[dst->sa_family].af_output) 8711820Sjulian (sapsock, flags, &t_dst, 8811820Sjulian sizeof (struct sap_packet) + sizeof(u_short)); 8911820Sjulian TRACE_SAP_OUTPUT(ifp, &t_dst, 9011820Sjulian sizeof (struct sap_packet) + sizeof(u_short)); 9111820Sjulian} 9211820Sjulian 9311820Sjulian/* 9411820Sjulian * Supply dst with the contents of the SAP tables. If the ServType == 9511820Sjulian * SAP_WILDCARD (0xFFFF) supply the whole table, otherwise only the 9611820Sjulian * services that are of ServType. If this won't fit in one packet, chop 9711820Sjulian * it up into several. 9811820Sjulian * 9911820Sjulian * This must be done using the split horizon algorithm. 10011820Sjulian * 1. Don't send SAP info to the interface from where it was received. 10111820Sjulian * 2. If a service is received from more than one interface and the cost is 10211820Sjulian * the same, don't publish it on either interface. I am calling this 10311820Sjulian * clones. 10411820Sjulian */ 10511820Sjulianvoid 10611820Sjuliansap_supply(dst, flags, ifp, ServType) 10711820Sjulian struct sockaddr *dst; 10811820Sjulian int flags; 10911820Sjulian struct interface *ifp; 11011820Sjulian int ServType; 11111820Sjulian{ 11211820Sjulian register struct sap_entry *sap; 11311820Sjulian register struct sap_entry *csap; /* Clone route */ 11411820Sjulian register struct sap_hash *sh; 11511820Sjulian register struct sap_info *n = sap_msg->sap; 11611820Sjulian struct sap_hash *base = sap_head; 11711820Sjulian struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) dst; 11811820Sjulian af_output_t *output = afswitch[dst->sa_family].af_output; 11911820Sjulian int size, metric; 12011820Sjulian 12111820Sjulian if (sipx->sipx_port == 0) 12211820Sjulian sipx->sipx_port = htons(IPXPORT_SAP); 12311820Sjulian 12411820Sjulian sap_msg->sap_cmd = ntohs(SAP_RESP); 12511820Sjulian 12611820Sjulian for (sh = base; sh < &base[SAPHASHSIZ]; sh++) 12711820Sjulian for (sap = sh->forw; sap != (struct sap_entry *)sh; sap = sap->forw) { 12811820Sjulian size = (char *)n - (char *)sap_msg; 12911820Sjulian if (size > MAXPACKETSIZE - sizeof (struct sap_info)) { 13011820Sjulian (*output)(sapsock, flags, dst, size); 13111820Sjulian TRACE_SAP_OUTPUT(ifp, dst, size); 13211820Sjulian n = sap_msg->sap; 13311820Sjulian } 13411820Sjulian 13511820Sjulian /* 13611820Sjulian * Check for the servicetype except if the ServType is 13711820Sjulian * a wildcard (0xFFFF). 13811820Sjulian */ 13911820Sjulian if ((ServType != SAP_WILDCARD) && 14011820Sjulian (ServType != sap->sap.ServType)) 14111820Sjulian continue; 14211820Sjulian 14311820Sjulian /* 14411820Sjulian * This should do rule one and two of the split horizon 14511820Sjulian * algorithm. 14611820Sjulian */ 14711820Sjulian if (sap->ifp == ifp) 14811820Sjulian continue; 14911820Sjulian 15011820Sjulian /* 15111820Sjulian * Rule 2. 15211820Sjulian * Look if we have clones (different routes to the same 15311820Sjulian * place with exactly the same cost). 15411820Sjulian * 15511820Sjulian * We should not publish on any of the clone interfaces. 15611820Sjulian */ 15711820Sjulian csap = sap->clone; 15811820Sjulian while (csap) { 15911820Sjulian if (csap->ifp == ifp) 16011820Sjulian continue; 16111820Sjulian csap = csap->clone; 16211820Sjulian } 16311820Sjulian 16411820Sjulian /* 16511820Sjulian * Don't advertise services with more than 15 hops. It 16611820Sjulian * will be confused with a service that has gone down. 16711820Sjulian */ 16811820Sjulian if (ntohs(sap->sap.hops) == (HOPCNT_INFINITY - 1)) 16911820Sjulian continue; 17011820Sjulian metric = min(ntohs(sap->sap.hops) + 1, HOPCNT_INFINITY); 17111820Sjulian 17211820Sjulian *n = sap->sap; 17311820Sjulian n->hops = htons(metric); 17411820Sjulian n++; 17511820Sjulian } 17611820Sjulian if (n != sap_msg->sap) { 17711820Sjulian size = (char *)n - (char *)sap_msg; 17811820Sjulian (*output)(sapsock, flags, dst, size); 17911820Sjulian TRACE_SAP_OUTPUT(ifp, dst, size); 18011820Sjulian } 18111820Sjulian} 18211820Sjulian 183