Return to output.c CVS log

Up to [CSRG BSD Unix] / 43BSD / etc / XNSrouted

Annotation of 43BSD/etc/XNSrouted/output.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1985 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  * Includes material written at Cornell University by Bill Nesheim,
                      7:  * by permission of the author.
                      8:  */
                      9: 
                     10: #ifndef lint
                     11: static char sccsid[] = "@(#)output.c   5.5 (Berkeley) 2/14/86";
                     12: #endif
                     13: 
                     14: /*
                     15:  * Routing Table Management Daemon
                     16:  */
                     17: #include "defs.h"
                     18: 
                     19: /*
                     20:  * Apply the function "f" to all non-passive
                     21:  * interfaces.  If the interface supports the
                     22:  * use of broadcasting use it, otherwise address
                     23:  * the output to the known router.
                     24:  */
                     25: toall(f)
                     26:        int (*f)();
                     27: {
                     28:        register struct interface *ifp;
                     29:        register struct sockaddr *dst;
                     30:        register int flags;
                     31:        extern struct interface *ifnet;
                     32: 
                     33:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
                     34:                if (ifp->int_flags & IFF_PASSIVE)
                     35:                        continue;
                     36:                dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
                     37:                      ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
                     38:                      &ifp->int_addr;
                     39:                flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
                     40:                (*f)(dst, flags, ifp);
                     41:        }
                     42: }
                     43: 
                     44: /*
                     45:  * Output a preformed packet.
                     46:  */
                     47: /*ARGSUSED*/
                     48: sendmsg(dst, flags, ifp)
                     49:        struct sockaddr *dst;
                     50:        int flags;
                     51:        struct interface *ifp;
                     52: {
                     53: 
                     54:        (*afswitch[dst->sa_family].af_output)
                     55:                (flags, dst, sizeof (struct rip));
                     56:        TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
                     57: }
                     58: 
                     59: /*
                     60:  * Supply dst with the contents of the routing tables.
                     61:  * If this won't fit in one packet, chop it up into several.
                     62:  */
                     63: supply(dst, flags, ifp)
                     64:        struct sockaddr *dst;
                     65:        int flags;
                     66:        struct interface *ifp;
                     67: {
                     68:        register struct rt_entry *rt;
                     69:        register struct rthash *rh;
                     70:        register struct netinfo *nn;
                     71:        register struct netinfo *n = msg->rip_nets;
                     72:        struct rthash *base = hosthash;
                     73:        struct sockaddr_ns *sns =  (struct sockaddr_ns *) dst;
                     74:        int (*output)() = afswitch[dst->sa_family].af_output;
                     75:        int doinghost = 1, size, metric;
                     76:        union ns_net net;
                     77: 
                     78:        msg->rip_cmd = ntohs(RIPCMD_RESPONSE);
                     79: again:
                     80:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
                     81:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
                     82:                size = (char *)n - (char *)msg;
                     83:                if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
                     84:                        (*output)(flags, dst, size);
                     85:                        TRACE_OUTPUT(ifp, dst, size);
                     86:                        n = msg->rip_nets;
                     87:                }
                     88:                sns = (struct sockaddr_ns *)&rt->rt_dst;
                     89:                if ((rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST)
                     90:                        sns = (struct sockaddr_ns *)&rt->rt_router;
                     91:                metric = min(rt->rt_metric + 1, HOPCNT_INFINITY);
                     92:                net = sns->sns_addr.x_net;
                     93:                /*
                     94:                 * Make sure that we don't put out a two net entries
                     95:                 * for a pt to pt link (one for the G route, one for the if)
                     96:                 * This is a kludge, and won't work if there are lots of nets.
                     97:                 */
                     98:                for (nn = msg->rip_nets; nn < n; nn++) {
                     99:                        if (ns_neteqnn(net, nn->rip_dst)) {
                    100:                                if (metric < ntohs(nn->rip_metric))
                    101:                                        nn->rip_metric = htons(metric);
                    102:                                goto next;
                    103:                        }
                    104:                }
                    105:                n->rip_dst = net;
                    106:                n->rip_metric = htons(metric);
                    107:                n++;
                    108:        next:;
                    109:        }
                    110:        if (doinghost) {
                    111:                doinghost = 0;
                    112:                base = nethash;
                    113:                goto again;
                    114:        }
                    115:        if (n != msg->rip_nets) {
                    116:                size = (char *)n - (char *)msg;
                    117:                (*output)(flags, dst, size);
                    118:                TRACE_OUTPUT(ifp, dst, size);
                    119:        }
                    120: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.