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Annotation of 42BSD/etc/routed/output.c, revision 1.1.1.1

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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