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Annotation of 43BSDReno/sbin/XNSrouted/af.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1985 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This file includes significant work done at Cornell University by
        !             6:  * Bill Nesheim.  That work included by permission.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted
        !             9:  * provided that: (1) source distributions retain this entire copyright
        !            10:  * notice and comment, and (2) distributions including binaries display
        !            11:  * the following acknowledgement:  ``This product includes software
        !            12:  * developed by the University of California, Berkeley and its contributors''
        !            13:  * in the documentation or other materials provided with the distribution
        !            14:  * and in all advertising materials mentioning features or use of this
        !            15:  * software. Neither the name of the University nor the names of its
        !            16:  * contributors may be used to endorse or promote products derived
        !            17:  * from this software without specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: static char sccsid[] = "@(#)af.c       5.10 (Berkeley) 6/1/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: #include "defs.h"
        !            28: 
        !            29: /*
        !            30:  * Address family support routines
        !            31:  */
        !            32: int    null_hash(), null_netmatch(), null_output(),
        !            33:        null_portmatch(), null_portcheck(),
        !            34:        null_checkhost(), null_ishost(), null_canon();
        !            35: int    xnnet_hash(), xnnet_netmatch(), xnnet_output(),
        !            36:        xnnet_portmatch(),
        !            37:        xnnet_checkhost(), xnnet_ishost(), xnnet_canon();
        !            38: #define NIL \
        !            39:        { null_hash,            null_netmatch,          null_output, \
        !            40:          null_portmatch,       null_portcheck,         null_checkhost, \
        !            41:          null_ishost,          null_canon }
        !            42: #define        XNSNET \
        !            43:        { xnnet_hash,           xnnet_netmatch,         xnnet_output, \
        !            44:          xnnet_portmatch,      xnnet_portmatch,        xnnet_checkhost, \
        !            45:          xnnet_ishost,         xnnet_canon }
        !            46: 
        !            47: struct afswitch afswitch[AF_MAX] =
        !            48:        { NIL, NIL, NIL, NIL, NIL, NIL, XNSNET, NIL, NIL, NIL, NIL };
        !            49: 
        !            50: struct sockaddr_ns xnnet_default = { sizeof(struct sockaddr_ns), AF_NS };
        !            51: 
        !            52: union ns_net ns_anynet;
        !            53: union ns_net ns_zeronet;
        !            54: 
        !            55: xnnet_hash(sns, hp)
        !            56:        register struct sockaddr_ns *sns;
        !            57:        struct afhash *hp;
        !            58: {
        !            59:        register long hash = 0;
        !            60:        register u_short *s = sns->sns_addr.x_host.s_host;
        !            61:        union ns_net_u net;
        !            62: 
        !            63:        net.net_e = sns->sns_addr.x_net;
        !            64:        hp->afh_nethash = net.long_e;
        !            65:        hash = *s++; hash <<= 8; hash += *s++; hash <<= 8; hash += *s;
        !            66:        hp->afh_hosthash = hash;
        !            67: }
        !            68: 
        !            69: xnnet_netmatch(sxn1, sxn2)
        !            70:        struct sockaddr_ns *sxn1, *sxn2;
        !            71: {
        !            72:        return (ns_neteq(sxn1->sns_addr, sxn2->sns_addr));
        !            73: }
        !            74: 
        !            75: /*
        !            76:  * Verify the message is from the right port.
        !            77:  */
        !            78: xnnet_portmatch(sns)
        !            79:        register struct sockaddr_ns *sns;
        !            80: {
        !            81:        
        !            82:        return (ntohs(sns->sns_addr.x_port) == IDPPORT_RIF );
        !            83: }
        !            84: 
        !            85: 
        !            86: /*
        !            87:  * xns output routine.
        !            88:  */
        !            89: #ifdef DEBUG
        !            90: int do_output = 0;
        !            91: #endif
        !            92: xnnet_output(flags, sns, size)
        !            93:        int flags;
        !            94:        struct sockaddr_ns *sns;
        !            95:        int size;
        !            96: {
        !            97:        struct sockaddr_ns dst;
        !            98: 
        !            99:        dst = *sns;
        !           100:        sns = &dst;
        !           101:        if (sns->sns_addr.x_port == 0)
        !           102:                sns->sns_addr.x_port = htons(IDPPORT_RIF);
        !           103: #ifdef DEBUG
        !           104:        if(do_output || ntohs(msg->rip_cmd) == RIPCMD_REQUEST)
        !           105: #endif 
        !           106:        /*
        !           107:         * Kludge to allow us to get routes out to machines that
        !           108:         * don't know their addresses yet; send to that address on
        !           109:         * ALL connected nets
        !           110:         */
        !           111:         if (ns_neteqnn(sns->sns_addr.x_net, ns_zeronet)) {
        !           112:                extern  struct interface *ifnet;
        !           113:                register struct interface *ifp;
        !           114:                
        !           115:                for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !           116:                        sns->sns_addr.x_net = 
        !           117:                                satons_addr(ifp->int_addr).x_net;
        !           118:                        (void) sendto(s, msg, size, flags, sns, sizeof (*sns));
        !           119:                }
        !           120:                return;
        !           121:        }
        !           122:        
        !           123:        (void) sendto(s, msg, size, flags, sns, sizeof (*sns));
        !           124: }
        !           125: 
        !           126: /*
        !           127:  * Return 1 if we want this route.
        !           128:  * We use this to disallow route net G entries for one for multiple
        !           129:  * point to point links.
        !           130:  */
        !           131: xnnet_checkhost(sns)
        !           132:        struct sockaddr_ns *sns;
        !           133: {
        !           134:        register struct interface *ifp = if_ifwithnet(sns);
        !           135:        /*
        !           136:         * We want this route if there is no more than one 
        !           137:         * point to point interface with this network.
        !           138:         */
        !           139:        if (ifp == 0 || (ifp->int_flags & IFF_POINTOPOINT)==0) return (1);
        !           140:        return (ifp->int_sq.n == ifp->int_sq.p);
        !           141: }
        !           142: 
        !           143: /*
        !           144:  * Return 1 if the address is
        !           145:  * for a host, 0 for a network.
        !           146:  */
        !           147: xnnet_ishost(sns)
        !           148: struct sockaddr_ns *sns;
        !           149: {
        !           150:        register u_short *s = sns->sns_addr.x_host.s_host;
        !           151: 
        !           152:        if ((s[0]==0xffff) && (s[1]==0xffff) && (s[2]==0xffff))
        !           153:                return (0);
        !           154:        else
        !           155:                return (1);
        !           156: }
        !           157: 
        !           158: xnnet_canon(sns)
        !           159:        struct sockaddr_ns *sns;
        !           160: {
        !           161: 
        !           162:        sns->sns_addr.x_port = 0;
        !           163: }
        !           164: 
        !           165: /*ARGSUSED*/
        !           166: null_hash(addr, hp)
        !           167:        struct sockaddr *addr;
        !           168:        struct afhash *hp;
        !           169: {
        !           170: 
        !           171:        hp->afh_nethash = hp->afh_hosthash = 0;
        !           172: }
        !           173: 
        !           174: /*ARGSUSED*/
        !           175: null_netmatch(a1, a2)
        !           176:        struct sockaddr *a1, *a2;
        !           177: {
        !           178: 
        !           179:        return (0);
        !           180: }
        !           181: 
        !           182: /*ARGSUSED*/
        !           183: null_output(s, f, a1, n)
        !           184:        int s, f;
        !           185:        struct sockaddr *a1;
        !           186:        int n;
        !           187: {
        !           188: 
        !           189:        ;
        !           190: }
        !           191: 
        !           192: /*ARGSUSED*/
        !           193: null_portmatch(a1)
        !           194:        struct sockaddr *a1;
        !           195: {
        !           196: 
        !           197:        return (0);
        !           198: }
        !           199: 
        !           200: /*ARGSUSED*/
        !           201: null_portcheck(a1)
        !           202:        struct sockaddr *a1;
        !           203: {
        !           204: 
        !           205:        return (0);
        !           206: }
        !           207: 
        !           208: /*ARGSUSED*/
        !           209: null_ishost(a1)
        !           210:        struct sockaddr *a1;
        !           211: {
        !           212: 
        !           213:        return (0);
        !           214: }
        !           215: 
        !           216: /*ARGSUSED*/
        !           217: null_checkhost(a1)
        !           218:        struct sockaddr *a1;
        !           219: {
        !           220: 
        !           221:        return (0);
        !           222: }
        !           223: 
        !           224: /*ARGSUSED*/
        !           225: null_canon(a1)
        !           226:        struct sockaddr *a1;
        !           227: {
        !           228: 
        !           229:        ;
        !           230: }

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