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Annotation of 42BSD/etc/routed/output.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)output.c   4.4 (Berkeley) 6/1/83";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * Routing Table Management Daemon
        !             7:  */
        !             8: #include "defs.h"
        !             9: 
        !            10: /*
        !            11:  * Apply the function "f" to all non-passive
        !            12:  * interfaces.  If the interface supports the
        !            13:  * use of broadcasting use it, otherwise address
        !            14:  * the output to the known router.
        !            15:  */
        !            16: toall(f)
        !            17:        int (*f)();
        !            18: {
        !            19:        register struct interface *ifp;
        !            20:        register struct sockaddr *dst;
        !            21:        register int flags;
        !            22:        extern struct interface *ifnet;
        !            23: 
        !            24:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
        !            25:                if (ifp->int_flags & IFF_PASSIVE)
        !            26:                        continue;
        !            27:                dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
        !            28:                      ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
        !            29:                      &ifp->int_addr;
        !            30:                flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
        !            31:                (*f)(dst, flags, ifp);
        !            32:        }
        !            33: }
        !            34: 
        !            35: /*
        !            36:  * Output a preformed packet.
        !            37:  */
        !            38: /*ARGSUSED*/
        !            39: sendmsg(dst, flags, ifp)
        !            40:        struct sockaddr *dst;
        !            41:        int flags;
        !            42:        struct interface *ifp;
        !            43: {
        !            44: 
        !            45:        (*afswitch[dst->sa_family].af_output)(s, flags,
        !            46:                dst, sizeof (struct rip));
        !            47:        TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
        !            48: }
        !            49: 
        !            50: /*
        !            51:  * Supply dst with the contents of the routing tables.
        !            52:  * If this won't fit in one packet, chop it up into several.
        !            53:  */
        !            54: supply(dst, flags, ifp)
        !            55:        struct sockaddr *dst;
        !            56:        int flags;
        !            57:        struct interface *ifp;
        !            58: {
        !            59:        register struct rt_entry *rt;
        !            60:        struct netinfo *n = msg->rip_nets;
        !            61:        register struct rthash *rh;
        !            62:        struct rthash *base = hosthash;
        !            63:        int doinghost = 1, size;
        !            64:        int (*output)() = afswitch[dst->sa_family].af_output;
        !            65: 
        !            66:        msg->rip_cmd = RIPCMD_RESPONSE;
        !            67:        msg->rip_vers = RIPVERSION;
        !            68: again:
        !            69:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
        !            70:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            71:                size = (char *)n - packet;
        !            72:                if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
        !            73:                        (*output)(s, flags, dst, size);
        !            74:                        TRACE_OUTPUT(ifp, dst, size);
        !            75:                        n = msg->rip_nets;
        !            76:                }
        !            77:                n->rip_dst = rt->rt_dst;
        !            78:                n->rip_dst.sa_family = htons(n->rip_dst.sa_family);
        !            79:                n->rip_metric = htonl(min(rt->rt_metric + 1, HOPCNT_INFINITY));
        !            80:                n++;
        !            81:        }
        !            82:        if (doinghost) {
        !            83:                doinghost = 0;
        !            84:                base = nethash;
        !            85:                goto again;
        !            86:        }
        !            87:        if (n != msg->rip_nets) {
        !            88:                size = (char *)n - packet;
        !            89:                (*output)(s, flags, dst, size);
        !            90:                TRACE_OUTPUT(ifp, dst, size);
        !            91:        }
        !            92: }

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