1 /* $OpenBSD: database.c,v 1.23 2023/06/21 07:45:47 claudio Exp $ */ 2 3 /* 4 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org> 5 * Copyright (c) 2004, 2005, 2007 Esben Norby <norby@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 #include <sys/socket.h> 22 #include <netinet/in.h> 23 #include <netinet/ip6.h> 24 #include <arpa/inet.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <unistd.h> 28 29 #include "ospf6d.h" 30 #include "ospf6.h" 31 #include "log.h" 32 #include "ospfe.h" 33 34 void db_sum_list_next(struct nbr *); 35 36 /* database description packet handling */ 37 int 38 send_db_description(struct nbr *nbr) 39 { 40 struct in6_addr dst; 41 struct db_dscrp_hdr dd_hdr; 42 struct lsa_entry *le, *nle; 43 struct ibuf *buf; 44 u_int8_t bits = 0; 45 46 if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip6_hdr))) == NULL) 47 fatal("send_db_description"); 48 49 /* OSPF header */ 50 if (gen_ospf_hdr(buf, nbr->iface, PACKET_TYPE_DD)) 51 goto fail; 52 53 /* reserve space for database description header */ 54 if (ibuf_add_zero(buf, sizeof(dd_hdr)) == -1) 55 goto fail; 56 57 switch (nbr->state) { 58 case NBR_STA_DOWN: 59 case NBR_STA_ATTEMPT: 60 case NBR_STA_INIT: 61 case NBR_STA_2_WAY: 62 case NBR_STA_SNAP: 63 log_debug("send_db_description: neighbor ID %s (%s): " 64 "cannot send packet in state %s", inet_ntoa(nbr->id), 65 nbr->iface->name, nbr_state_name(nbr->state)); 66 goto fail; 67 case NBR_STA_XSTRT: 68 bits |= OSPF_DBD_MS | OSPF_DBD_M | OSPF_DBD_I; 69 nbr->dd_more = 1; 70 break; 71 case NBR_STA_XCHNG: 72 if (nbr->dd_master) 73 bits |= OSPF_DBD_MS; 74 else 75 bits &= ~OSPF_DBD_MS; 76 77 if (TAILQ_EMPTY(&nbr->db_sum_list)) { 78 bits &= ~OSPF_DBD_M; 79 nbr->dd_more = 0; 80 } else { 81 bits |= OSPF_DBD_M; 82 nbr->dd_more = 1; 83 } 84 85 bits &= ~OSPF_DBD_I; 86 87 /* build LSA list */ 88 for (le = TAILQ_FIRST(&nbr->db_sum_list); le != NULL && 89 ibuf_left(buf) >= sizeof(struct lsa_hdr); le = nle) { 90 nbr->dd_end = nle = TAILQ_NEXT(le, entry); 91 if (ibuf_add(buf, le->le_lsa, sizeof(struct lsa_hdr))) 92 goto fail; 93 } 94 break; 95 case NBR_STA_LOAD: 96 case NBR_STA_FULL: 97 if (nbr->dd_master) 98 bits |= OSPF_DBD_MS; 99 else 100 bits &= ~OSPF_DBD_MS; 101 bits &= ~OSPF_DBD_M; 102 bits &= ~OSPF_DBD_I; 103 104 nbr->dd_more = 0; 105 break; 106 default: 107 fatalx("send_db_description: unknown neighbor state"); 108 } 109 110 bzero(&dd_hdr, sizeof(dd_hdr)); 111 112 switch (nbr->iface->type) { 113 case IF_TYPE_POINTOPOINT: 114 inet_pton(AF_INET6, AllSPFRouters, &dst); 115 dd_hdr.iface_mtu = htons(nbr->iface->mtu); 116 break; 117 case IF_TYPE_BROADCAST: 118 dst = nbr->addr; 119 dd_hdr.iface_mtu = htons(nbr->iface->mtu); 120 break; 121 case IF_TYPE_NBMA: 122 case IF_TYPE_POINTOMULTIPOINT: 123 /* XXX not supported */ 124 break; 125 case IF_TYPE_VIRTUALLINK: 126 dst = nbr->iface->dst; 127 dd_hdr.iface_mtu = 0; 128 break; 129 default: 130 fatalx("send_db_description: unknown interface type"); 131 } 132 133 dd_hdr.opts = htonl(area_ospf_options(nbr->iface->area)); 134 dd_hdr.bits = bits; 135 dd_hdr.dd_seq_num = htonl(nbr->dd_seq_num); 136 137 if (ibuf_set(buf, sizeof(struct ospf_hdr), &dd_hdr, 138 sizeof(dd_hdr)) == -1) 139 goto fail; 140 141 /* calculate checksum */ 142 if (upd_ospf_hdr(buf, nbr->iface)) 143 goto fail; 144 145 /* transmit packet */ 146 if (send_packet(nbr->iface, buf, &dst) == -1) 147 goto fail; 148 149 ibuf_free(buf); 150 return (0); 151 fail: 152 log_warn("send_db_description"); 153 ibuf_free(buf); 154 return (-1); 155 } 156 157 void 158 recv_db_description(struct nbr *nbr, char *buf, u_int16_t len) 159 { 160 struct db_dscrp_hdr dd_hdr; 161 int dupe = 0; 162 163 if (len < sizeof(dd_hdr)) { 164 log_warnx("recv_db_description: neighbor ID %s (%s): " 165 "bad packet size", inet_ntoa(nbr->id), nbr->iface->name); 166 return; 167 } 168 memcpy(&dd_hdr, buf, sizeof(dd_hdr)); 169 buf += sizeof(dd_hdr); 170 len -= sizeof(dd_hdr); 171 172 /* db description packet sanity checks */ 173 if (ntohs(dd_hdr.iface_mtu) > nbr->iface->mtu) { 174 log_warnx("recv_db_description: neighbor ID %s (%s): " 175 "invalid MTU %d expected %d", inet_ntoa(nbr->id), 176 nbr->iface->name, ntohs(dd_hdr.iface_mtu), 177 nbr->iface->mtu); 178 return; 179 } 180 181 if (nbr->last_rx_options == dd_hdr.opts && 182 nbr->last_rx_bits == dd_hdr.bits && 183 ntohl(dd_hdr.dd_seq_num) == nbr->dd_seq_num - nbr->dd_master ? 184 1 : 0) { 185 log_debug("recv_db_description: dupe from " 186 "neighbor ID %s (%s)", inet_ntoa(nbr->id), 187 nbr->iface->name); 188 dupe = 1; 189 } 190 191 switch (nbr->state) { 192 case NBR_STA_DOWN: 193 case NBR_STA_ATTEMPT: 194 case NBR_STA_2_WAY: 195 case NBR_STA_SNAP: 196 log_debug("recv_db_description: neighbor ID %s (%s): " 197 "packet ignored in state %s", inet_ntoa(nbr->id), 198 nbr->iface->name, nbr_state_name(nbr->state)); 199 return; 200 case NBR_STA_INIT: 201 /* evaluate dr and bdr after issuing a 2-Way event */ 202 nbr_fsm(nbr, NBR_EVT_2_WAY_RCVD); 203 if_fsm(nbr->iface, IF_EVT_NBR_CHNG); 204 if (nbr->state != NBR_STA_XSTRT) 205 return; 206 /* FALLTHROUGH */ 207 case NBR_STA_XSTRT: 208 if (dupe) 209 return; 210 /* 211 * check bits: either I,M,MS or only M 212 */ 213 if (dd_hdr.bits == (OSPF_DBD_I | OSPF_DBD_M | OSPF_DBD_MS)) { 214 /* if nbr Router ID is larger than own -> slave */ 215 if ((ntohl(nbr->id.s_addr)) > 216 ntohl(ospfe_router_id())) { 217 /* slave */ 218 nbr->dd_master = 0; 219 nbr->dd_seq_num = ntohl(dd_hdr.dd_seq_num); 220 221 /* event negotiation done */ 222 nbr_fsm(nbr, NBR_EVT_NEG_DONE); 223 } 224 } else if (!(dd_hdr.bits & (OSPF_DBD_I | OSPF_DBD_MS))) { 225 /* M only case: we are master */ 226 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num) { 227 log_warnx("recv_db_description: " 228 "neighbor ID %s (%s): " 229 "invalid seq num, mine %x his %x", 230 inet_ntoa(nbr->id), nbr->iface->name, 231 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 232 return; 233 } 234 nbr->dd_seq_num++; 235 236 /* event negotiation done */ 237 nbr_fsm(nbr, NBR_EVT_NEG_DONE); 238 239 /* this packet may already have data so pass it on */ 240 if (len > 0) { 241 nbr->dd_pending++; 242 ospfe_imsg_compose_rde(IMSG_DD, nbr->peerid, 243 0, buf, len); 244 } 245 } else { 246 /* ignore packet */ 247 log_debug("recv_db_description: neighbor ID %s (%s): " 248 "packet ignored in state %s (bad flags)", 249 inet_ntoa(nbr->id), nbr->iface->name, 250 nbr_state_name(nbr->state)); 251 } 252 break; 253 case NBR_STA_XCHNG: 254 case NBR_STA_LOAD: 255 case NBR_STA_FULL: 256 if (dd_hdr.bits & OSPF_DBD_I || 257 !(dd_hdr.bits & OSPF_DBD_MS) == !nbr->dd_master) { 258 log_warnx("recv_db_description: neighbor ID %s (%s): " 259 "seq num mismatch, bad flags", inet_ntoa(nbr->id), 260 nbr->iface->name); 261 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 262 return; 263 } 264 265 if (nbr->last_rx_options != dd_hdr.opts) { 266 log_warnx("recv_db_description: neighbor ID %s (%s): " 267 "seq num mismatch, bad options", 268 inet_ntoa(nbr->id), nbr->iface->name); 269 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 270 return; 271 } 272 273 if (dupe) { 274 if (!nbr->dd_master) 275 /* retransmit */ 276 start_db_tx_timer(nbr); 277 return; 278 } 279 280 if (nbr->state != NBR_STA_XCHNG) { 281 log_warnx("recv_db_description: neighbor ID %s (%s): " 282 "invalid seq num, mine %x his %x", 283 inet_ntoa(nbr->id), nbr->iface->name, 284 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 285 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 286 return; 287 } 288 289 /* sanity check dd seq number */ 290 if (nbr->dd_master) { 291 /* master */ 292 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num) { 293 log_warnx("recv_db_description: " 294 "neighbor ID %s (%s): " 295 "invalid seq num, mine %x his %x, master", 296 inet_ntoa(nbr->id), nbr->iface->name, 297 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 298 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 299 return; 300 } 301 nbr->dd_seq_num++; 302 } else { 303 /* slave */ 304 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num + 1) { 305 log_warnx("recv_db_description: " 306 "neighbor ID %s (%s): " 307 "invalid seq num, mine %x his %x, slave", 308 inet_ntoa(nbr->id), nbr->iface->name, 309 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 310 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 311 return; 312 } 313 nbr->dd_seq_num = ntohl(dd_hdr.dd_seq_num); 314 } 315 316 /* forward to RDE and let it decide which LSAs to request */ 317 if (len > 0) { 318 nbr->dd_pending++; 319 ospfe_imsg_compose_rde(IMSG_DD, nbr->peerid, 0, 320 buf, len); 321 } 322 323 /* next packet */ 324 db_sum_list_next(nbr); 325 start_db_tx_timer(nbr); 326 327 if (!(dd_hdr.bits & OSPF_DBD_M) && 328 TAILQ_EMPTY(&nbr->db_sum_list)) 329 if (!nbr->dd_master || !nbr->dd_more) 330 nbr_fsm(nbr, NBR_EVT_XCHNG_DONE); 331 break; 332 default: 333 fatalx("recv_db_description: unknown neighbor state"); 334 } 335 336 nbr->last_rx_options = dd_hdr.opts; 337 nbr->last_rx_bits = dd_hdr.bits; 338 } 339 340 void 341 db_sum_list_add(struct nbr *nbr, struct lsa_hdr *lsa) 342 { 343 struct lsa_entry *le; 344 345 if ((le = calloc(1, sizeof(*le))) == NULL) 346 fatal("db_sum_list_add"); 347 348 TAILQ_INSERT_TAIL(&nbr->db_sum_list, le, entry); 349 le->le_lsa = lsa; 350 } 351 352 void 353 db_sum_list_next(struct nbr *nbr) 354 { 355 struct lsa_entry *le; 356 357 while ((le = TAILQ_FIRST(&nbr->db_sum_list)) != nbr->dd_end) { 358 TAILQ_REMOVE(&nbr->db_sum_list, le, entry); 359 free(le->le_lsa); 360 free(le); 361 } 362 } 363 364 void 365 db_sum_list_clr(struct nbr *nbr) 366 { 367 nbr->dd_end = NULL; 368 db_sum_list_next(nbr); 369 } 370 371 /* timers */ 372 void 373 db_tx_timer(int fd, short event, void *arg) 374 { 375 struct nbr *nbr = arg; 376 struct timeval tv; 377 378 switch (nbr->state) { 379 case NBR_STA_DOWN: 380 case NBR_STA_ATTEMPT: 381 case NBR_STA_INIT: 382 case NBR_STA_2_WAY: 383 case NBR_STA_SNAP: 384 return ; 385 case NBR_STA_XSTRT: 386 case NBR_STA_XCHNG: 387 case NBR_STA_LOAD: 388 case NBR_STA_FULL: 389 send_db_description(nbr); 390 break; 391 default: 392 log_debug("db_tx_timer: neighbor ID %s (%s): " 393 "unknown neighbor state", 394 inet_ntoa(nbr->id), nbr->iface->name); 395 break; 396 } 397 398 /* reschedule db_tx_timer but only in master mode */ 399 if (nbr->dd_master) { 400 timerclear(&tv); 401 tv.tv_sec = nbr->iface->rxmt_interval; 402 if (evtimer_add(&nbr->db_tx_timer, &tv) == -1) 403 fatal("db_tx_timer"); 404 } 405 } 406 407 void 408 start_db_tx_timer(struct nbr *nbr) 409 { 410 struct timeval tv; 411 412 if (nbr == nbr->iface->self) 413 return; 414 415 timerclear(&tv); 416 if (evtimer_add(&nbr->db_tx_timer, &tv) == -1) 417 fatal("start_db_tx_timer"); 418 } 419 420 void 421 stop_db_tx_timer(struct nbr *nbr) 422 { 423 if (nbr == nbr->iface->self) 424 return; 425 426 if (evtimer_del(&nbr->db_tx_timer) == -1) 427 fatal("stop_db_tx_timer"); 428 } 429