1 #ifndef lint 2 static char sccsid[] = "@(#)output.c 4.1 11/02/82"; 3 #endif 4 5 /* 6 * Routing Table Management Daemon 7 */ 8 #include "router.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 extern struct interface *ifnet; 22 23 for (ifp = ifnet; ifp; ifp = ifp->int_next) { 24 if (ifp->int_flags & IFF_PASSIVE) 25 continue; 26 dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr : 27 ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr : 28 &ifp->int_addr; 29 (*f)(dst, ifp->int_flags & IFF_INTERFACE, ifp); 30 } 31 } 32 33 /* 34 * Output a preformed packet. 35 */ 36 /*ARGSUSED*/ 37 sendmsg(dst, dontroute, ifp) 38 struct sockaddr *dst; 39 int dontroute; 40 struct interface *ifp; 41 { 42 43 (*afswitch[dst->sa_family].af_output)(dontroute ? snoroute : s, 44 dst, sizeof (struct rip)); 45 TRACE_OUTPUT(ifp, dst, sizeof (struct rip)); 46 } 47 48 /* 49 * Supply dst with the contents of the routing tables. 50 * If this won't fit in one packet, chop it up into several. 51 */ 52 supply(dst, dontroute, ifp) 53 struct sockaddr *dst; 54 struct interface *ifp; 55 { 56 register struct rt_entry *rt; 57 struct netinfo *n = msg->rip_nets; 58 register struct rthash *rh; 59 struct rthash *base = hosthash; 60 int doinghost = 1, size; 61 int (*output)() = afswitch[dst->sa_family].af_output; 62 int sto = dontroute ? snoroute : s; 63 64 msg->rip_cmd = RIPCMD_RESPONSE; 65 again: 66 for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) 67 for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { 68 size = (char *)n - packet; 69 if (size > MAXPACKETSIZE - sizeof (struct netinfo)) { 70 (*output)(sto, dst, size); 71 TRACE_OUTPUT(ifp, dst, size); 72 n = msg->rip_nets; 73 } 74 n->rip_dst = rt->rt_dst; 75 n->rip_metric = min(rt->rt_metric + 1, HOPCNT_INFINITY); 76 n++; 77 } 78 if (doinghost) { 79 doinghost = 0; 80 base = nethash; 81 goto again; 82 } 83 if (n != msg->rip_nets) { 84 size = (char *)n - packet; 85 (*output)(sto, dst, size); 86 TRACE_OUTPUT(ifp, dst, size); 87 } 88 } 89