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Annotation of 43BSDReno/sbin/routed/output.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983, 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)output.c   5.14 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: /*
        !            25:  * Routing Table Management Daemon
        !            26:  */
        !            27: #include "defs.h"
        !            28: 
        !            29: /*
        !            30:  * Apply the function "f" to all non-passive
        !            31:  * interfaces.  If the interface supports the
        !            32:  * use of broadcasting use it, otherwise address
        !            33:  * the output to the known router.
        !            34:  */
        !            35: toall(f, rtstate, skipif)
        !            36:        int (*f)();
        !            37:        int rtstate;
        !            38:        struct interface *skipif;
        !            39: {
        !            40:        register struct interface *ifp;
        !            41:        register struct sockaddr *dst;
        !            42:        register int flags;
        !            43:        extern struct interface *ifnet;
        !            44: 
        !            45:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            46:                if (ifp->int_flags & IFF_PASSIVE || ifp == skipif)
        !            47:                        continue;
        !            48:                dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
        !            49:                      ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
        !            50:                      &ifp->int_addr;
        !            51:                flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
        !            52:                (*f)(dst, flags, ifp, rtstate);
        !            53:        }
        !            54: }
        !            55: 
        !            56: /*
        !            57:  * Output a preformed packet.
        !            58:  */
        !            59: /*ARGSUSED*/
        !            60: sendmsg(dst, flags, ifp, rtstate)
        !            61:        struct sockaddr *dst;
        !            62:        int flags;
        !            63:        struct interface *ifp;
        !            64:        int rtstate;
        !            65: {
        !            66: 
        !            67:        (*afswitch[dst->sa_family].af_output)(s, flags,
        !            68:                dst, sizeof (struct rip));
        !            69:        TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
        !            70: }
        !            71: 
        !            72: /*
        !            73:  * Supply dst with the contents of the routing tables.
        !            74:  * If this won't fit in one packet, chop it up into several.
        !            75:  */
        !            76: supply(dst, flags, ifp, rtstate)
        !            77:        struct sockaddr *dst;
        !            78:        int flags;
        !            79:        register struct interface *ifp;
        !            80:        int rtstate;
        !            81: {
        !            82:        register struct rt_entry *rt;
        !            83:        register struct netinfo *n = msg->rip_nets;
        !            84:        register struct rthash *rh;
        !            85:        struct rthash *base = hosthash;
        !            86:        int doinghost = 1, size;
        !            87:        int (*output)() = afswitch[dst->sa_family].af_output;
        !            88:        int (*sendroute)() = afswitch[dst->sa_family].af_sendroute;
        !            89:        int npackets = 0;
        !            90: 
        !            91:        msg->rip_cmd = RIPCMD_RESPONSE;
        !            92:        msg->rip_vers = RIPVERSION;
        !            93:        bzero(msg->rip_res1, sizeof(msg->rip_res1));
        !            94: again:
        !            95:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
        !            96:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            97:                /*
        !            98:                 * Don't resend the information on the network
        !            99:                 * from which it was received (unless sending
        !           100:                 * in response to a query).
        !           101:                 */
        !           102:                if (ifp && rt->rt_ifp == ifp &&
        !           103:                    (rt->rt_state & RTS_INTERFACE) == 0)
        !           104:                        continue;
        !           105:                if (rt->rt_state & RTS_EXTERNAL)
        !           106:                        continue;
        !           107:                /*
        !           108:                 * For dynamic updates, limit update to routes
        !           109:                 * with the specified state.
        !           110:                 */
        !           111:                if (rtstate && (rt->rt_state & rtstate) == 0)
        !           112:                        continue;
        !           113:                /*
        !           114:                 * Limit the spread of subnet information
        !           115:                 * to those who are interested.
        !           116:                 */
        !           117:                if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
        !           118:                        if (rt->rt_dst.sa_family != dst->sa_family)
        !           119:                                continue;
        !           120:                        if ((*sendroute)(rt, dst) == 0)
        !           121:                                continue;
        !           122:                }
        !           123:                size = (char *)n - packet;
        !           124:                if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
        !           125:                        TRACE_OUTPUT(ifp, dst, size);
        !           126:                        (*output)(s, flags, dst, size);
        !           127:                        /*
        !           128:                         * If only sending to ourselves,
        !           129:                         * one packet is enough to monitor interface.
        !           130:                         */
        !           131:                        if (ifp && (ifp->int_flags &
        !           132:                           (IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0)
        !           133:                                return;
        !           134:                        n = msg->rip_nets;
        !           135:                        npackets++;
        !           136:                }
        !           137:                n->rip_dst = rt->rt_dst;
        !           138: #if BSD < 198810
        !           139:                if (sizeof(n->rip_dst.sa_family) > 1)   /* XXX */
        !           140:                n->rip_dst.sa_family = htons(n->rip_dst.sa_family);
        !           141: #else
        !           142: #define osa(x) ((struct osockaddr *)(&(x)))
        !           143:                osa(n->rip_dst)->sa_family = htons(n->rip_dst.sa_family);
        !           144: #endif
        !           145:                n->rip_metric = htonl(rt->rt_metric);
        !           146:                n++;
        !           147:        }
        !           148:        if (doinghost) {
        !           149:                doinghost = 0;
        !           150:                base = nethash;
        !           151:                goto again;
        !           152:        }
        !           153:        if (n != msg->rip_nets || (npackets == 0 && rtstate == 0)) {
        !           154:                size = (char *)n - packet;
        !           155:                TRACE_OUTPUT(ifp, dst, size);
        !           156:                (*output)(s, flags, dst, size);
        !           157:        }
        !           158: }

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