1*24307Ssklower #ifndef lint 2*24307Ssklower static char rcsid[] = "$Header$"; 3*24307Ssklower #endif 4*24307Ssklower 5*24307Ssklower /* 6*24307Ssklower * XNS Routing Table Management Daemon 7*24307Ssklower */ 8*24307Ssklower #include "defs.h" 9*24307Ssklower 10*24307Ssklower struct sockaddr * 11*24307Ssklower xns_nettosa(net) 12*24307Ssklower u_short *net; 13*24307Ssklower { 14*24307Ssklower static struct sockaddr_xn sxn; 15*24307Ssklower 16*24307Ssklower bzero(&sxn, sizeof (struct sockaddr_xn)); 17*24307Ssklower sxn.sxn_family = AF_XNS; 18*24307Ssklower xnnet(sxn.sxn_addr.xn_net) = xnnet(net); 19*24307Ssklower return( (struct sockaddr *)&sxn); 20*24307Ssklower 21*24307Ssklower } 22*24307Ssklower 23*24307Ssklower /* 24*24307Ssklower * Process a newly received packet. 25*24307Ssklower */ 26*24307Ssklower rip_input(from, size) 27*24307Ssklower struct sockaddr *from; 28*24307Ssklower int size; 29*24307Ssklower { 30*24307Ssklower struct rt_entry *rt; 31*24307Ssklower struct netinfo *n; 32*24307Ssklower struct interface *ifp; 33*24307Ssklower int newsize; 34*24307Ssklower struct afswitch *afp; 35*24307Ssklower 36*24307Ssklower 37*24307Ssklower TRACE_INPUT(ifp, from, size); 38*24307Ssklower if (from->sa_family >= AF_MAX) 39*24307Ssklower return; 40*24307Ssklower afp = &afswitch[from->sa_family]; 41*24307Ssklower 42*24307Ssklower /* are we talking to ourselves? */ 43*24307Ssklower if (ifp = if_ifwithaddr(from)) { 44*24307Ssklower rt = rtfind(from); 45*24307Ssklower if (rt == 0 || (rt->rt_state & RTS_INTERFACE) == 0) 46*24307Ssklower addrouteforif(ifp); 47*24307Ssklower else 48*24307Ssklower rt->rt_timer = 0; 49*24307Ssklower return; 50*24307Ssklower } 51*24307Ssklower 52*24307Ssklower size -= sizeof (u_short) /* command */; 53*24307Ssklower n = msg->rip_nets; 54*24307Ssklower 55*24307Ssklower switch (ntohs(msg->rip_cmd)) { 56*24307Ssklower 57*24307Ssklower case RIPCMD_REQUEST: 58*24307Ssklower /* Be quiet if we don't have anything interesting to talk about */ 59*24307Ssklower if (!supplier) return; 60*24307Ssklower newsize = 0; 61*24307Ssklower while (size > 0) { 62*24307Ssklower if (size < sizeof (struct netinfo)) 63*24307Ssklower break; 64*24307Ssklower size -= sizeof (struct netinfo); 65*24307Ssklower 66*24307Ssklower /* 67*24307Ssklower * A single entry with rip_dst == DSTNETS_ALL and 68*24307Ssklower * metric ``infinity'' means ``all routes''. 69*24307Ssklower */ 70*24307Ssklower if (ntohl(xnnet(n->rip_dst)) == DSTNETS_ALL && 71*24307Ssklower ntohs(n->rip_metric) == HOPCNT_INFINITY && size == 0) { 72*24307Ssklower if(ifp = if_ifwithnet(from)) 73*24307Ssklower supply(from, 0, ifp); 74*24307Ssklower return; 75*24307Ssklower } 76*24307Ssklower /* 77*24307Ssklower * request for specific nets 78*24307Ssklower */ 79*24307Ssklower rt = rtlookup(xns_nettosa(n->rip_dst)); 80*24307Ssklower n->rip_metric = htons( rt == 0 ? HOPCNT_INFINITY : 81*24307Ssklower min(rt->rt_metric+1, HOPCNT_INFINITY)); 82*24307Ssklower n++, newsize += sizeof (struct netinfo); 83*24307Ssklower } 84*24307Ssklower if (newsize > 0) { 85*24307Ssklower msg->rip_cmd = htons(RIPCMD_RESPONSE); 86*24307Ssklower newsize += sizeof (u_short); 87*24307Ssklower /* should check for if with dstaddr(from) first */ 88*24307Ssklower if(ifp = if_ifwithnet(from)) 89*24307Ssklower (*afp->af_output)(ifp->int_ripsock[0], 0, from, newsize); 90*24307Ssklower } 91*24307Ssklower return; 92*24307Ssklower 93*24307Ssklower case RIPCMD_RESPONSE: 94*24307Ssklower /* verify message came from a router */ 95*24307Ssklower if ((*afp->af_portmatch)(from) == 0) 96*24307Ssklower return; 97*24307Ssklower /* update timer for interface on which the packet arrived */ 98*24307Ssklower if ((rt = rtfind(from)) && (rt->rt_state & RTS_INTERFACE)) 99*24307Ssklower rt->rt_timer = 0; 100*24307Ssklower for (; size > 0; size -= sizeof (struct netinfo), n++) { 101*24307Ssklower if (size < sizeof (struct netinfo)) 102*24307Ssklower break; 103*24307Ssklower if ((unsigned) ntohs(n->rip_metric) > HOPCNT_INFINITY) 104*24307Ssklower continue; 105*24307Ssklower rt = rtlookup(xns_nettosa(n->rip_dst)); 106*24307Ssklower if (rt == 0) { 107*24307Ssklower rtadd(xns_nettosa(n->rip_dst), from, ntohs(n->rip_metric), 0); 108*24307Ssklower continue; 109*24307Ssklower } 110*24307Ssklower 111*24307Ssklower /* 112*24307Ssklower * Update if from gateway and different, 113*24307Ssklower * from anywhere and shorter, or getting stale and equivalent. 114*24307Ssklower */ 115*24307Ssklower if ((equal(from, &rt->rt_router) && 116*24307Ssklower ntohs(n->rip_metric) != rt->rt_metric ) || 117*24307Ssklower (unsigned) ntohs(n->rip_metric) < rt->rt_metric || 118*24307Ssklower (rt->rt_timer > (EXPIRE_TIME/2) && 119*24307Ssklower rt->rt_metric == ntohs(n->rip_metric))) { 120*24307Ssklower rtchange(rt, from, ntohs(n->rip_metric)); 121*24307Ssklower rt->rt_timer = 0; 122*24307Ssklower } 123*24307Ssklower } 124*24307Ssklower return; 125*24307Ssklower } 126*24307Ssklower } 127