Return to output.c CVS log

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

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

1.1       root        1: /*
                      2:  * Copyright (c) 1983 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: 
                      7: #ifndef lint
                      8: static char sccsid[] = "@(#)output.c   5.3 (Berkeley) 5/30/86";
                      9: #endif not lint
                     10: 
                     11: /*
                     12:  * Routing Table Management Daemon
                     13:  */
                     14: #include "defs.h"
                     15: 
                     16: /*
                     17:  * Apply the function "f" to all non-passive
                     18:  * interfaces.  If the interface supports the
                     19:  * use of broadcasting use it, otherwise address
                     20:  * the output to the known router.
                     21:  */
                     22: toall(f)
                     23:        int (*f)();
                     24: {
                     25:        register struct interface *ifp;
                     26:        register struct sockaddr *dst;
                     27:        register int flags;
                     28:        extern struct interface *ifnet;
                     29: 
                     30:        for (ifp = ifnet; ifp; ifp = ifp->int_next) {
                     31:                if (ifp->int_flags & IFF_PASSIVE)
                     32:                        continue;
                     33:                dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
                     34:                      ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
                     35:                      &ifp->int_addr;
                     36:                flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
                     37:                (*f)(dst, flags, ifp);
                     38:        }
                     39: }
                     40: 
                     41: /*
                     42:  * Output a preformed packet.
                     43:  */
                     44: /*ARGSUSED*/
                     45: sendmsg(dst, flags, ifp)
                     46:        struct sockaddr *dst;
                     47:        int flags;
                     48:        struct interface *ifp;
                     49: {
                     50: 
                     51:        (*afswitch[dst->sa_family].af_output)(s, flags,
                     52:                dst, sizeof (struct rip));
                     53:        TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
                     54: }
                     55: 
                     56: /*
                     57:  * Supply dst with the contents of the routing tables.
                     58:  * If this won't fit in one packet, chop it up into several.
                     59:  */
                     60: supply(dst, flags, ifp)
                     61:        struct sockaddr *dst;
                     62:        int flags;
                     63:        struct interface *ifp;
                     64: {
                     65:        register struct rt_entry *rt;
                     66:        struct netinfo *n = msg->rip_nets;
                     67:        register struct rthash *rh;
                     68:        struct rthash *base = hosthash;
                     69:        int doinghost = 1, size;
                     70:        int (*output)() = afswitch[dst->sa_family].af_output;
                     71:        int (*sendsubnet)() = afswitch[dst->sa_family].af_sendsubnet;
                     72: 
                     73:        msg->rip_cmd = RIPCMD_RESPONSE;
                     74:        msg->rip_vers = RIPVERSION;
                     75: again:
                     76:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
                     77:        for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
                     78:                /*
                     79:                 * Don't resend the information
                     80:                 * on the network from which it was received.
                     81:                 */
                     82:                if (ifp && rt->rt_ifp == ifp)
                     83:                        continue;
                     84:                if (rt->rt_state & RTS_EXTERNAL)
                     85:                        continue;
                     86:                /*
                     87:                 * Limit the spread of subnet information
                     88:                 * to those who are interested.
                     89:                 */
                     90:                if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
                     91:                        if (ifp && (ifp->int_flags & IFF_SUBNET) == 0)
                     92:                                continue;
                     93:                        if (rt->rt_dst.sa_family != dst->sa_family)
                     94:                                continue;
                     95:                        if ((*sendsubnet)(rt, dst) == 0)
                     96:                                continue;
                     97:                }
                     98:                size = (char *)n - packet;
                     99:                if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
                    100:                        (*output)(s, flags, dst, size);
                    101:                        TRACE_OUTPUT(ifp, dst, size);
                    102:                        n = msg->rip_nets;
                    103:                }
                    104:                n->rip_dst = rt->rt_dst;
                    105:                n->rip_dst.sa_family = htons(n->rip_dst.sa_family);
                    106:                n->rip_metric = htonl(min(rt->rt_metric + 1, HOPCNT_INFINITY));
                    107:                n++;
                    108:        }
                    109:        if (doinghost) {
                    110:                doinghost = 0;
                    111:                base = nethash;
                    112:                goto again;
                    113:        }
                    114:        if (n != msg->rip_nets) {
                    115:                size = (char *)n - packet;
                    116:                (*output)(s, flags, dst, size);
                    117:                TRACE_OUTPUT(ifp, dst, size);
                    118:        }
                    119: }

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