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Annotation of 43BSDTahoe/etc/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 this notice is preserved and that due credit is given
        !             7:  * to the University of California at Berkeley. The name of the University
        !             8:  * may not be used to endorse or promote products derived from this
        !             9:  * software without specific prior written permission. This software
        !            10:  * is provided ``as is'' without express or implied warranty.
        !            11:  */
        !            12: 
        !            13: #ifndef lint
        !            14: static char sccsid[] = "@(#)output.c   5.10 (Berkeley) 5/31/88";
        !            15: #endif /* not lint */
        !            16: 
        !            17: /*
        !            18:  * Routing Table Management Daemon
        !            19:  */
        !            20: #include "defs.h"
        !            21: 
        !            22: /*
        !            23:  * Apply the function "f" to all non-passive
        !            24:  * interfaces.  If the interface supports the
        !            25:  * use of broadcasting use it, otherwise address
        !            26:  * the output to the known router.
        !            27:  */
        !            28: toall(f)
        !            29:        int (*f)();
        !            30: {
        !            31:        register struct interface *ifp;
        !            32:        register struct sockaddr *dst;
        !            33:        register int flags;
        !            34:        extern struct interface *ifnet;
        !            35: 
        !            36:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            37:                if (ifp->int_flags & IFF_PASSIVE)
        !            38:                        continue;
        !            39:                dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
        !            40:                      ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
        !            41:                      &ifp->int_addr;
        !            42:                flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
        !            43:                (*f)(dst, flags, ifp);
        !            44:        }
        !            45: }
        !            46: 
        !            47: /*
        !            48:  * Output a preformed packet.
        !            49:  */
        !            50: /*ARGSUSED*/
        !            51: sendmsg(dst, flags, ifp)
        !            52:        struct sockaddr *dst;
        !            53:        int flags;
        !            54:        struct interface *ifp;
        !            55: {
        !            56: 
        !            57:        (*afswitch[dst->sa_family].af_output)(s, flags,
        !            58:                dst, sizeof (struct rip));
        !            59:        TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
        !            60: }
        !            61: 
        !            62: /*
        !            63:  * Supply dst with the contents of the routing tables.
        !            64:  * If this won't fit in one packet, chop it up into several.
        !            65:  */
        !            66: supply(dst, flags, ifp)
        !            67:        struct sockaddr *dst;
        !            68:        int flags;
        !            69:        register struct interface *ifp;
        !            70: {
        !            71:        register struct rt_entry *rt;
        !            72:        register struct netinfo *n = msg->rip_nets;
        !            73:        register struct rthash *rh;
        !            74:        struct rthash *base = hosthash;
        !            75:        int doinghost = 1, size;
        !            76:        int (*output)() = afswitch[dst->sa_family].af_output;
        !            77:        int (*sendroute)() = afswitch[dst->sa_family].af_sendroute;
        !            78:        int npackets = 0;
        !            79: 
        !            80:        msg->rip_cmd = RIPCMD_RESPONSE;
        !            81:        msg->rip_vers = RIPVERSION;
        !            82:        bzero(msg->rip_res1, sizeof(msg->rip_res1));
        !            83: again:
        !            84:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
        !            85:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            86:                /*
        !            87:                 * Don't resend the information on the network
        !            88:                 * from which it was received (unless sending
        !            89:                 * in response to a query).
        !            90:                 */
        !            91:                if (ifp && rt->rt_ifp == ifp &&
        !            92:                    (rt->rt_state & RTS_INTERFACE) == 0)
        !            93:                        continue;
        !            94:                if (rt->rt_state & RTS_EXTERNAL)
        !            95:                        continue;
        !            96:                /*
        !            97:                 * Limit the spread of subnet information
        !            98:                 * to those who are interested.
        !            99:                 */
        !           100:                if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
        !           101:                        if (rt->rt_dst.sa_family != dst->sa_family)
        !           102:                                continue;
        !           103:                        if ((*sendroute)(rt, dst) == 0)
        !           104:                                continue;
        !           105:                }
        !           106:                size = (char *)n - packet;
        !           107:                if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
        !           108:                        (*output)(s, flags, dst, size);
        !           109:                        TRACE_OUTPUT(ifp, dst, size);
        !           110:                        /*
        !           111:                         * If only sending to ourselves,
        !           112:                         * one packet is enough to monitor interface.
        !           113:                         */
        !           114:                        if ((ifp->int_flags &
        !           115:                           (IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0)
        !           116:                                return;
        !           117:                        n = msg->rip_nets;
        !           118:                        npackets++;
        !           119:                }
        !           120:                n->rip_dst = rt->rt_dst;
        !           121:                n->rip_dst.sa_family = htons(n->rip_dst.sa_family);
        !           122:                n->rip_metric = htonl(rt->rt_metric);
        !           123:                n++;
        !           124:        }
        !           125:        if (doinghost) {
        !           126:                doinghost = 0;
        !           127:                base = nethash;
        !           128:                goto again;
        !           129:        }
        !           130:        if (n != msg->rip_nets || npackets == 0) {
        !           131:                size = (char *)n - packet;
        !           132:                (*output)(s, flags, dst, size);
        !           133:                TRACE_OUTPUT(ifp, dst, size);
        !           134:        }
        !           135: }

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