1 /* $OpenBSD: database.c,v 1.20 2020/07/15 14:47:41 denis 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_reserve(buf, sizeof(dd_hdr)) == NULL) 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: " 64 "cannot send packet in state %s", inet_ntoa(nbr->id), 65 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 memcpy(ibuf_seek(buf, sizeof(struct ospf_hdr), sizeof(dd_hdr)), 138 &dd_hdr, sizeof(dd_hdr)); 139 140 /* calculate checksum */ 141 if (upd_ospf_hdr(buf, nbr->iface)) 142 goto fail; 143 144 /* transmit packet */ 145 if (send_packet(nbr->iface, buf, &dst) == -1) 146 goto fail; 147 148 ibuf_free(buf); 149 return (0); 150 fail: 151 log_warn("send_db_description"); 152 ibuf_free(buf); 153 return (-1); 154 } 155 156 void 157 recv_db_description(struct nbr *nbr, char *buf, u_int16_t len) 158 { 159 struct db_dscrp_hdr dd_hdr; 160 int dupe = 0; 161 162 if (len < sizeof(dd_hdr)) { 163 log_warnx("recv_db_description: neighbor ID %s: " 164 "bad packet size", inet_ntoa(nbr->id)); 165 return; 166 } 167 memcpy(&dd_hdr, buf, sizeof(dd_hdr)); 168 buf += sizeof(dd_hdr); 169 len -= sizeof(dd_hdr); 170 171 /* db description packet sanity checks */ 172 if (ntohs(dd_hdr.iface_mtu) > nbr->iface->mtu) { 173 log_warnx("recv_db_description: neighbor ID %s: " 174 "invalid MTU %d expected %d", inet_ntoa(nbr->id), 175 ntohs(dd_hdr.iface_mtu), nbr->iface->mtu); 176 return; 177 } 178 179 if (nbr->last_rx_options == dd_hdr.opts && 180 nbr->last_rx_bits == dd_hdr.bits && 181 ntohl(dd_hdr.dd_seq_num) == nbr->dd_seq_num - nbr->dd_master ? 182 1 : 0) { 183 log_debug("recv_db_description: dupe from neighbor ID %s", 184 inet_ntoa(nbr->id)); 185 dupe = 1; 186 } 187 188 switch (nbr->state) { 189 case NBR_STA_DOWN: 190 case NBR_STA_ATTEMPT: 191 case NBR_STA_2_WAY: 192 case NBR_STA_SNAP: 193 log_debug("recv_db_description: neighbor ID %s: " 194 "packet ignored in state %s", inet_ntoa(nbr->id), 195 nbr_state_name(nbr->state)); 196 return; 197 case NBR_STA_INIT: 198 /* evaluate dr and bdr after issuing a 2-Way event */ 199 nbr_fsm(nbr, NBR_EVT_2_WAY_RCVD); 200 if_fsm(nbr->iface, IF_EVT_NBR_CHNG); 201 if (nbr->state != NBR_STA_XSTRT) 202 return; 203 /* FALLTHROUGH */ 204 case NBR_STA_XSTRT: 205 if (dupe) 206 return; 207 /* 208 * check bits: either I,M,MS or only M 209 */ 210 if (dd_hdr.bits == (OSPF_DBD_I | OSPF_DBD_M | OSPF_DBD_MS)) { 211 /* if nbr Router ID is larger than own -> slave */ 212 if ((ntohl(nbr->id.s_addr)) > 213 ntohl(ospfe_router_id())) { 214 /* slave */ 215 nbr->dd_master = 0; 216 nbr->dd_seq_num = ntohl(dd_hdr.dd_seq_num); 217 218 /* event negotiation done */ 219 nbr_fsm(nbr, NBR_EVT_NEG_DONE); 220 } 221 } else if (!(dd_hdr.bits & (OSPF_DBD_I | OSPF_DBD_MS))) { 222 /* M only case: we are master */ 223 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num) { 224 log_warnx("recv_db_description: " 225 "neighbor ID %s: " 226 "invalid seq num, mine %x his %x", 227 inet_ntoa(nbr->id), nbr->dd_seq_num, 228 ntohl(dd_hdr.dd_seq_num)); 229 return; 230 } 231 nbr->dd_seq_num++; 232 233 /* event negotiation done */ 234 nbr_fsm(nbr, NBR_EVT_NEG_DONE); 235 236 /* this packet may already have data so pass it on */ 237 if (len > 0) { 238 nbr->dd_pending++; 239 ospfe_imsg_compose_rde(IMSG_DD, nbr->peerid, 240 0, buf, len); 241 } 242 } else { 243 /* ignore packet */ 244 log_debug("recv_db_description: neighbor ID %s: " 245 "packet ignored in state %s (bad flags)", 246 inet_ntoa(nbr->id), nbr_state_name(nbr->state)); 247 } 248 break; 249 case NBR_STA_XCHNG: 250 case NBR_STA_LOAD: 251 case NBR_STA_FULL: 252 if (dd_hdr.bits & OSPF_DBD_I || 253 !(dd_hdr.bits & OSPF_DBD_MS) == !nbr->dd_master) { 254 log_warnx("recv_db_description: neighbor ID %s: " 255 "seq num mismatch, bad flags", inet_ntoa(nbr->id)); 256 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 257 return; 258 } 259 260 if (nbr->last_rx_options != dd_hdr.opts) { 261 log_warnx("recv_db_description: neighbor ID %s: " 262 "seq num mismatch, bad options", 263 inet_ntoa(nbr->id)); 264 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 265 return; 266 } 267 268 if (dupe) { 269 if (!nbr->dd_master) 270 /* retransmit */ 271 start_db_tx_timer(nbr); 272 return; 273 } 274 275 if (nbr->state != NBR_STA_XCHNG) { 276 log_warnx("recv_db_description: neighbor ID %s: " 277 "invalid seq num, mine %x his %x", 278 inet_ntoa(nbr->id), nbr->dd_seq_num, 279 ntohl(dd_hdr.dd_seq_num)); 280 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 281 return; 282 } 283 284 /* sanity check dd seq number */ 285 if (nbr->dd_master) { 286 /* master */ 287 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num) { 288 log_warnx("recv_db_description: " 289 "neighbor ID %s: " 290 "invalid seq num, mine %x his %x, master", 291 inet_ntoa(nbr->id), nbr->dd_seq_num, 292 ntohl(dd_hdr.dd_seq_num)); 293 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 294 return; 295 } 296 nbr->dd_seq_num++; 297 } else { 298 /* slave */ 299 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num + 1) { 300 log_warnx("recv_db_description: " 301 "neighbor ID %s: " 302 "invalid seq num, mine %x his %x, slave", 303 inet_ntoa(nbr->id), nbr->dd_seq_num, 304 ntohl(dd_hdr.dd_seq_num)); 305 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 306 return; 307 } 308 nbr->dd_seq_num = ntohl(dd_hdr.dd_seq_num); 309 } 310 311 /* forward to RDE and let it decide which LSAs to request */ 312 if (len > 0) { 313 nbr->dd_pending++; 314 ospfe_imsg_compose_rde(IMSG_DD, nbr->peerid, 0, 315 buf, len); 316 } 317 318 /* next packet */ 319 db_sum_list_next(nbr); 320 start_db_tx_timer(nbr); 321 322 if (!(dd_hdr.bits & OSPF_DBD_M) && 323 TAILQ_EMPTY(&nbr->db_sum_list)) 324 if (!nbr->dd_master || !nbr->dd_more) 325 nbr_fsm(nbr, NBR_EVT_XCHNG_DONE); 326 break; 327 default: 328 fatalx("recv_db_description: unknown neighbor state"); 329 } 330 331 nbr->last_rx_options = dd_hdr.opts; 332 nbr->last_rx_bits = dd_hdr.bits; 333 } 334 335 void 336 db_sum_list_add(struct nbr *nbr, struct lsa_hdr *lsa) 337 { 338 struct lsa_entry *le; 339 340 if ((le = calloc(1, sizeof(*le))) == NULL) 341 fatal("db_sum_list_add"); 342 343 TAILQ_INSERT_TAIL(&nbr->db_sum_list, le, entry); 344 le->le_lsa = lsa; 345 } 346 347 void 348 db_sum_list_next(struct nbr *nbr) 349 { 350 struct lsa_entry *le; 351 352 while ((le = TAILQ_FIRST(&nbr->db_sum_list)) != nbr->dd_end) { 353 TAILQ_REMOVE(&nbr->db_sum_list, le, entry); 354 free(le->le_lsa); 355 free(le); 356 } 357 } 358 359 void 360 db_sum_list_clr(struct nbr *nbr) 361 { 362 nbr->dd_end = NULL; 363 db_sum_list_next(nbr); 364 } 365 366 /* timers */ 367 /* ARGSUSED */ 368 void 369 db_tx_timer(int fd, short event, void *arg) 370 { 371 struct nbr *nbr = arg; 372 struct timeval tv; 373 374 switch (nbr->state) { 375 case NBR_STA_DOWN: 376 case NBR_STA_ATTEMPT: 377 case NBR_STA_INIT: 378 case NBR_STA_2_WAY: 379 case NBR_STA_SNAP: 380 return ; 381 case NBR_STA_XSTRT: 382 case NBR_STA_XCHNG: 383 case NBR_STA_LOAD: 384 case NBR_STA_FULL: 385 send_db_description(nbr); 386 break; 387 default: 388 log_debug("db_tx_timer: neighbor ID %s: unknown neighbor state", 389 inet_ntoa(nbr->id)); 390 break; 391 } 392 393 /* reschedule db_tx_timer but only in master mode */ 394 if (nbr->dd_master) { 395 timerclear(&tv); 396 tv.tv_sec = nbr->iface->rxmt_interval; 397 if (evtimer_add(&nbr->db_tx_timer, &tv) == -1) 398 fatal("db_tx_timer"); 399 } 400 } 401 402 void 403 start_db_tx_timer(struct nbr *nbr) 404 { 405 struct timeval tv; 406 407 if (nbr == nbr->iface->self) 408 return; 409 410 timerclear(&tv); 411 if (evtimer_add(&nbr->db_tx_timer, &tv) == -1) 412 fatal("start_db_tx_timer"); 413 } 414 415 void 416 stop_db_tx_timer(struct nbr *nbr) 417 { 418 if (nbr == nbr->iface->self) 419 return; 420 421 if (evtimer_del(&nbr->db_tx_timer) == -1) 422 fatal("stop_db_tx_timer"); 423 } 424