1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1999 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * Portions of this source code were derived from Berkeley 4.3 BSD 32 * under license from the Regents of the University of California. 33 */ 34 35 #ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */ 36 37 /* 38 * Routing Table Management Daemon 39 */ 40 #include "defs.h" 41 42 /* 43 * Apply the function "supply" to all active 44 * interfaces with a link-local address. 45 */ 46 void 47 supplyall(struct sockaddr_in6 *sin6, int rtstate, struct interface *skipif, 48 boolean_t splith) 49 { 50 struct interface *ifp; 51 52 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) { 53 if ((ifp->int_flags & RIP6_IFF_UP) == 0) 54 continue; 55 if (ifp->int_flags & RIP6_IFF_NORTEXCH) { 56 if (tracing & OUTPUT_BIT) { 57 (void) fprintf(ftrace, 58 "Suppress sending RIPng response packet " 59 "on %s (no route exchange on interface)\n", 60 ifp->int_name); 61 (void) fflush(ftrace); 62 } 63 continue; 64 } 65 if (ifp->int_sock == -1) 66 continue; 67 if (ifp == skipif) 68 continue; 69 if (!IN6_IS_ADDR_LINKLOCAL(&ifp->int_addr)) 70 continue; 71 supply(sin6, ifp, rtstate, splith); 72 } 73 } 74 75 static void 76 solicit(struct sockaddr_in6 *sin6, struct interface *ifp) 77 { 78 msg->rip6_cmd = RIPCMD6_REQUEST; 79 msg->rip6_vers = RIPVERSION6; 80 msg->rip6_nets[0].rip6_prefix = in6addr_any; 81 msg->rip6_nets[0].rip6_prefix_length = 0; 82 msg->rip6_nets[0].rip6_metric = HOPCNT_INFINITY; 83 sendpacket(sin6, ifp, sizeof (struct rip6), 0); 84 } 85 86 void 87 solicitall(struct sockaddr_in6 *sin6) 88 { 89 struct interface *ifp; 90 91 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) { 92 if ((ifp->int_flags & RIP6_IFF_UP) == 0) 93 continue; 94 if (ifp->int_flags & RIP6_IFF_NORTEXCH) { 95 if (tracing & OUTPUT_BIT) { 96 (void) fprintf(ftrace, 97 "Suppress sending RIPng request packet " 98 "on %s (no route exchange on interface)\n", 99 ifp->int_name); 100 (void) fflush(ftrace); 101 } 102 continue; 103 } 104 if (ifp->int_sock == -1) 105 continue; 106 solicit(sin6, ifp); 107 } 108 } 109 110 111 /* 112 * Output a preformed packet. 113 */ 114 /*ARGSUSED*/ 115 void 116 sendpacket(struct sockaddr_in6 *sin6, struct interface *ifp, int size, 117 int flags) 118 { 119 if (sendto(ifp->int_sock, packet, size, flags, 120 (struct sockaddr *)sin6, sizeof (*sin6)) < 0) { 121 syslog(LOG_ERR, "sendpacket: sendto: %m"); 122 return; 123 } 124 TRACE_OUTPUT(ifp, sin6, sizeof (struct rip6)); 125 ifp->int_opackets++; 126 } 127 128 /* 129 * Supply dst with the contents of the routing tables. 130 * If this won't fit in one packet, chop it up into several. 131 */ 132 void 133 supply(struct sockaddr_in6 *sin6, struct interface *ifp, int rtstate, 134 boolean_t splith) 135 { 136 struct rt_entry *rt; 137 struct netinfo6 *n = msg->rip6_nets; 138 struct rthash *rh; 139 int size, i, maxsize; 140 uint8_t rtmetric; 141 142 msg->rip6_cmd = RIPCMD6_RESPONSE; 143 msg->rip6_vers = RIPVERSION6; 144 145 /* 146 * Initialize maxsize to the size of the largest RIPng packet supported 147 * on the outgoing interface. 148 */ 149 maxsize = ifp->int_mtu - sizeof (ip6_t) - sizeof (struct udphdr); 150 151 for (i = IPV6_ABITS; i >= 0; i--) { 152 if (net_hashes[i] == NULL) 153 continue; 154 155 for (rh = net_hashes[i]; rh < &net_hashes[i][ROUTEHASHSIZ]; 156 rh++) { 157 for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; 158 rt = rt->rt_forw) { 159 160 if (IN6_IS_ADDR_LINKLOCAL(&rt->rt_dst)) 161 continue; 162 if (IN6_IS_ADDR_UNSPECIFIED(&rt->rt_dst)) 163 continue; 164 165 /* do not send if private */ 166 if (rt->rt_state & RTS_PRIVATE) 167 continue; 168 169 /* 170 * Don't resend the information 171 * on the network from which it was received. 172 */ 173 if (splith && rt->rt_ifp != NULL && 174 strcmp(ifp->int_ifbase, 175 rt->rt_ifp->int_ifbase) == 0) { 176 if (dopoison) 177 rtmetric = HOPCNT_INFINITY; 178 else 179 continue; 180 } else { 181 rtmetric = rt->rt_metric; 182 } 183 184 /* 185 * For dynamic updates, limit update to routes 186 * with the specified state. 187 */ 188 if (rtstate != 0 && 189 (rt->rt_state & rtstate) == 0) 190 continue; 191 192 /* 193 * Check if there is space for another RTE. If 194 * not, send the packet built up and reset n for 195 * the remaining RTEs. 196 */ 197 size = (char *)n - packet; 198 if (size > maxsize - sizeof (struct netinfo6)) { 199 sendpacket(sin6, ifp, size, 0); 200 TRACE_OUTPUT(ifp, sin6, size); 201 n = msg->rip6_nets; 202 } 203 n->rip6_prefix = rt->rt_dst; 204 n->rip6_route_tag = rt->rt_tag; 205 n->rip6_prefix_length = rt->rt_prefix_length; 206 n->rip6_metric = min(rtmetric, HOPCNT_INFINITY); 207 n++; 208 } /* end of hash chain */ 209 } /* end of particular prefix length */ 210 } /* end of all prefix lengths */ 211 if (n != msg->rip6_nets) { 212 size = (char *)n - packet; 213 sendpacket(sin6, ifp, size, 0); 214 TRACE_OUTPUT(ifp, sin6, size); 215 } 216 } 217