fsm.c revision 1.2
1 /* $NetBSD: fsm.c,v 1.2 2010/12/09 00:10:59 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Mihai Chelaru <kefren (at) NetBSD.org> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/socket.h> 34 #include <arpa/inet.h> 35 #include <netinet/in.h> 36 #include <net/if.h> 37 38 #include <ifaddrs.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <strings.h> 42 43 #include "ldp.h" 44 #include "ldp_peer.h" 45 #include "socketops.h" 46 #include "ldp_errors.h" 47 #include "fsm.h" 48 49 char my_ldp_id[20]; 50 struct sockaddr mplssockaddr; 51 52 /* Processing a hello */ 53 void 54 run_ldp_hello(struct ldp_pdu * pduid, struct hello_tlv * ht, 55 struct in_addr * padd, struct in_addr * ladd, int mysock) 56 { 57 struct ldp_peer *peer = NULL; 58 struct in_addr peer_addr; 59 struct transport_address_tlv *trtlv; 60 struct hello_info *hi; 61 62 if ((!pduid) || (!ht)) 63 return; 64 65 debugp("Received it on address: %s\n", inet_ntoa(*ladd)); 66 debugp("Hello: Type: 0x%.4X Length: %.2d ID: %.8X\n", ht->type, 67 ht->length, ht->messageid); 68 69 /* Add it to hello list or just update timer */ 70 SLIST_FOREACH(hi, &hello_info_head, infos) 71 if (hi->ldp_id.s_addr == pduid->ldp_id.s_addr) 72 break; 73 if (hi == NULL) { 74 hi = malloc(sizeof(*hi)); 75 if (!hi) { 76 fatalp("Cannot alloc a hello info"); 77 return; 78 } 79 hi->ldp_id.s_addr = pduid->ldp_id.s_addr; 80 SLIST_INSERT_HEAD(&hello_info_head, hi, infos); 81 } else 82 /* Just update timer */ 83 hi->keepalive = LDP_HELLO_KEEP; 84 85 if (ht->length > 4) { /* Common hello parameters */ 86 ht->ch.type = ntohs(ht->ch.type); 87 ht->ch.length = ntohs(ht->ch.length); 88 ht->ch.holdtime = ntohs(ht->ch.holdtime); 89 ht->ch.res = ntohs(ht->ch.res); 90 debugp("Common hello Type: 0x%.4X Length: %.2d R:%d T:%d" 91 "Hold time: %d\n", ht->ch.type, ht->ch.length, 92 ht->ch.tr / 2, ht->ch.tr % 2, ht->ch.holdtime); 93 if (ht->ch.holdtime) 94 hi->keepalive = ht->ch.holdtime; 95 if (!get_ldp_peer(&pduid->ldp_id)) { 96 /* First of all set peer_addr to announced LDP_ID */ 97 memcpy(&peer_addr, &pduid->ldp_id, 98 sizeof(struct in_addr)); 99 /* 100 * Now let's see if there is any transport TLV in 101 * there 102 */ 103 if (pduid->length - PDU_PAYLOAD_LENGTH - 104 sizeof(struct hello_tlv) > 3) { 105 trtlv = (struct transport_address_tlv *) &ht[1]; 106 if (trtlv->type == TLV_IPV4_TRANSPORT) 107 memcpy(&peer_addr, &trtlv->address, 108 sizeof(struct in_addr)); 109 } 110 /* 111 * RFC says: If A1 > A2, LSR1 plays the active role; 112 * otherwise it is passive. 113 */ 114 if (ntohl(peer_addr.s_addr) < ntohl(ladd->s_addr)) { 115 #define TRADDR (trtlv && trtlv->type == TLV_IPV4_TRANSPORT) ? &peer_addr : NULL 116 peer = ldp_peer_new(&pduid->ldp_id, padd, 117 TRADDR, ht->ch.holdtime, 0); 118 if (!peer) 119 return; 120 if (peer && peer->state == LDP_PEER_CONNECTED) 121 send_initialize(peer); 122 } 123 } 124 } 125 } 126 127 struct address_list_tlv * 128 build_address_list_tlv(void) 129 { 130 struct address_list_tlv *t; 131 struct ifaddrs *ifa, *ifb; 132 struct sockaddr_in *sa; 133 struct in_addr *ia; 134 uint16_t adrcount = 0; 135 136 if (getifaddrs(&ifa) == -1) 137 return NULL; 138 139 /* Find out the number of addresses */ 140 /* Ignore loopback */ 141 for (ifb = ifa; ifb; ifb = ifb->ifa_next) 142 if ((ifb->ifa_addr->sa_family == AF_INET) && 143 (ifb->ifa_flags & IFF_UP)) { 144 sa = (struct sockaddr_in *) ifb->ifa_addr; 145 if (sa->sin_addr.s_addr << 24 >> 24 != 127) 146 adrcount++; 147 } 148 t = malloc(sizeof(*t) + (adrcount - 1) * sizeof(struct in_addr)); 149 150 if (!t) { 151 fatalp("build_address_list_tlv: malloc problem\n"); 152 return NULL; 153 } 154 155 t->type = htons(LDP_ADDRESS); 156 t->length = htons(sizeof(struct address_list_tlv) - TLV_TYPE_LENGTH 157 + (adrcount - 1) * sizeof(struct in_addr)); 158 t->messageid = htonl(get_message_id()); 159 160 t->a_type = htons(TLV_ADDRESS_LIST); 161 t->a_length = htons(sizeof(t->a_af) + 162 adrcount * sizeof(struct in_addr)); 163 t->a_af = htons(LDP_AF_INET); 164 165 ia = &t->a_address; 166 for (adrcount = 0, ifb = ifa; ifb; ifb = ifb->ifa_next) { 167 if ((ifb->ifa_addr->sa_family != AF_INET) || 168 (!(ifb->ifa_flags & IFF_UP)) || 169 (ifb->ifa_flags & IFF_LOOPBACK)) 170 continue; 171 sa = (struct sockaddr_in *) ifb->ifa_addr; 172 memcpy(&ia[adrcount], &sa->sin_addr, sizeof(struct in_addr)); 173 adrcount++; 174 } 175 freeifaddrs(ifa); 176 177 add_my_if_addrs(ia, adrcount); 178 return t; 179 } 180 181 /* 182 * Calculate LDP ID 183 * Get also mpls pseudo-interface address 184 */ 185 int 186 set_my_ldp_id() 187 { 188 struct ifaddrs *ifa, *ifb; 189 struct in_addr a; 190 struct sockaddr_in *sa; 191 192 a.s_addr = 0; 193 my_ldp_id[0] = 0; 194 mplssockaddr.sa_len = 0; 195 196 if (getifaddrs(&ifa) == -1) 197 return LDP_E_GENERIC; 198 199 for (ifb = ifa; ifb; ifb = ifb->ifa_next) 200 if(ifb->ifa_flags & IFF_UP) { 201 if (strncmp("mpls", ifb->ifa_name, 4) == 0 && 202 ifb->ifa_addr->sa_family == AF_LINK) 203 memcpy(&mplssockaddr, ifb->ifa_addr, 204 ifb->ifa_addr->sa_len); 205 206 if (ifb->ifa_addr->sa_family != AF_INET) 207 continue; 208 209 sa = (struct sockaddr_in *) ifb->ifa_addr; 210 if (ntohl(sa->sin_addr.s_addr) >> 24 == 127) 211 continue; /* No 127/8 */ 212 if (ntohl(sa->sin_addr.s_addr) > ntohl(a.s_addr)) 213 a.s_addr = sa->sin_addr.s_addr; 214 } 215 freeifaddrs(ifa); 216 debugp("LDP ID: %s\n", inet_ntoa(a)); 217 strlcpy(my_ldp_id, inet_ntoa(a), INET_ADDRSTRLEN); 218 return LDP_E_OK; 219 } 220
Indexes created Tue Sep 23 02:09:52 GMT 2025