1 /* $OpenBSD: database.c,v 1.18 2019/12/23 07:33:49 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 extern struct ospfd_conf *oeconf; 35 36 void db_sum_list_next(struct nbr *); 37 38 /* database description packet handling */ 39 int 40 send_db_description(struct nbr *nbr) 41 { 42 struct in6_addr dst; 43 struct db_dscrp_hdr dd_hdr; 44 struct lsa_entry *le, *nle; 45 struct ibuf *buf; 46 int ret = 0; 47 u_int8_t bits = 0; 48 49 if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip6_hdr))) == NULL) 50 fatal("send_db_description"); 51 52 /* OSPF header */ 53 if (gen_ospf_hdr(buf, nbr->iface, PACKET_TYPE_DD)) 54 goto fail; 55 56 /* reserve space for database description header */ 57 if (ibuf_reserve(buf, sizeof(dd_hdr)) == NULL) 58 goto fail; 59 60 switch (nbr->state) { 61 case NBR_STA_DOWN: 62 case NBR_STA_ATTEMPT: 63 case NBR_STA_INIT: 64 case NBR_STA_2_WAY: 65 case NBR_STA_SNAP: 66 log_debug("send_db_description: cannot send packet in state %s," 67 " neighbor ID %s", nbr_state_name(nbr->state), 68 inet_ntoa(nbr->id)); 69 ret = -1; 70 goto done; 71 case NBR_STA_XSTRT: 72 bits |= OSPF_DBD_MS | OSPF_DBD_M | OSPF_DBD_I; 73 nbr->dd_more = 1; 74 break; 75 case NBR_STA_XCHNG: 76 if (nbr->dd_master) 77 bits |= OSPF_DBD_MS; 78 else 79 bits &= ~OSPF_DBD_MS; 80 81 if (TAILQ_EMPTY(&nbr->db_sum_list)) { 82 bits &= ~OSPF_DBD_M; 83 nbr->dd_more = 0; 84 } else { 85 bits |= OSPF_DBD_M; 86 nbr->dd_more = 1; 87 } 88 89 bits &= ~OSPF_DBD_I; 90 91 /* build LSA list */ 92 for (le = TAILQ_FIRST(&nbr->db_sum_list); le != NULL && 93 buf->wpos + sizeof(struct lsa_hdr) < buf->max; le = nle) { 94 nbr->dd_end = nle = TAILQ_NEXT(le, entry); 95 if (ibuf_add(buf, le->le_lsa, sizeof(struct lsa_hdr))) 96 goto fail; 97 } 98 break; 99 case NBR_STA_LOAD: 100 case NBR_STA_FULL: 101 if (nbr->dd_master) 102 bits |= OSPF_DBD_MS; 103 else 104 bits &= ~OSPF_DBD_MS; 105 bits &= ~OSPF_DBD_M; 106 bits &= ~OSPF_DBD_I; 107 108 nbr->dd_more = 0; 109 break; 110 default: 111 fatalx("send_db_description: unknown neighbor state"); 112 } 113 114 bzero(&dd_hdr, sizeof(dd_hdr)); 115 116 switch (nbr->iface->type) { 117 case IF_TYPE_POINTOPOINT: 118 inet_pton(AF_INET6, AllSPFRouters, &dst); 119 dd_hdr.iface_mtu = htons(nbr->iface->mtu); 120 break; 121 case IF_TYPE_BROADCAST: 122 dst = nbr->addr; 123 dd_hdr.iface_mtu = htons(nbr->iface->mtu); 124 break; 125 case IF_TYPE_NBMA: 126 case IF_TYPE_POINTOMULTIPOINT: 127 /* XXX not supported */ 128 break; 129 case IF_TYPE_VIRTUALLINK: 130 dst = nbr->iface->dst; 131 dd_hdr.iface_mtu = 0; 132 break; 133 default: 134 fatalx("send_db_description: unknown interface type"); 135 } 136 137 dd_hdr.opts = htonl(area_ospf_options(nbr->iface->area)); 138 dd_hdr.bits = bits; 139 dd_hdr.dd_seq_num = htonl(nbr->dd_seq_num); 140 141 memcpy(ibuf_seek(buf, sizeof(struct ospf_hdr), sizeof(dd_hdr)), 142 &dd_hdr, sizeof(dd_hdr)); 143 144 /* calculate checksum */ 145 if (upd_ospf_hdr(buf, nbr->iface)) 146 goto fail; 147 148 /* transmit packet */ 149 ret = send_packet(nbr->iface, buf, &dst); 150 done: 151 ibuf_free(buf); 152 return (ret); 153 fail: 154 log_warn("send_db_description"); 155 ibuf_free(buf); 156 return (-1); 157 } 158 159 void 160 recv_db_description(struct nbr *nbr, char *buf, u_int16_t len) 161 { 162 struct db_dscrp_hdr dd_hdr; 163 int dupe = 0; 164 165 if (len < sizeof(dd_hdr)) { 166 log_warnx("recv_db_description: " 167 "bad packet size, neighbor ID %s", inet_ntoa(nbr->id)); 168 return; 169 } 170 memcpy(&dd_hdr, buf, sizeof(dd_hdr)); 171 buf += sizeof(dd_hdr); 172 len -= sizeof(dd_hdr); 173 174 /* db description packet sanity checks */ 175 if (ntohs(dd_hdr.iface_mtu) > nbr->iface->mtu) { 176 log_warnx("recv_db_description: invalid MTU %d sent by " 177 "neighbor ID %s, expected %d", ntohs(dd_hdr.iface_mtu), 178 inet_ntoa(nbr->id), nbr->iface->mtu); 179 return; 180 } 181 182 if (nbr->last_rx_options == dd_hdr.opts && 183 nbr->last_rx_bits == dd_hdr.bits && 184 ntohl(dd_hdr.dd_seq_num) == nbr->dd_seq_num - nbr->dd_master ? 185 1 : 0) { 186 log_debug("recv_db_description: dupe from ID %s", 187 inet_ntoa(nbr->id)); 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: packet ignored in state %s, " 197 "neighbor ID %s", nbr_state_name(nbr->state), 198 inet_ntoa(nbr->id)); 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: invalid " 228 "seq num, mine %x his %x", 229 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 230 return; 231 } 232 nbr->dd_seq_num++; 233 234 /* event negotiation done */ 235 nbr_fsm(nbr, NBR_EVT_NEG_DONE); 236 237 /* this packet may already have data so pass it on */ 238 if (len > 0) { 239 nbr->dd_pending++; 240 ospfe_imsg_compose_rde(IMSG_DD, nbr->peerid, 241 0, buf, len); 242 } 243 } else { 244 /* ignore packet */ 245 log_debug("recv_db_description: packet ignored in " 246 "state %s (bad flags), neighbor ID %s", 247 nbr_state_name(nbr->state), inet_ntoa(nbr->id)); 248 } 249 break; 250 case NBR_STA_XCHNG: 251 case NBR_STA_LOAD: 252 case NBR_STA_FULL: 253 if (dd_hdr.bits & OSPF_DBD_I || 254 !(dd_hdr.bits & OSPF_DBD_MS) == !nbr->dd_master) { 255 log_warnx("recv_db_description: seq num mismatch, " 256 "bad flags"); 257 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 258 return; 259 } 260 261 if (nbr->last_rx_options != dd_hdr.opts) { 262 log_warnx("recv_db_description: seq num mismatch, " 263 "bad options"); 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: invalid " 277 "seq num, mine %x his %x", 278 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 279 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 280 return; 281 } 282 283 /* sanity check dd seq number */ 284 if (nbr->dd_master) { 285 /* master */ 286 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num) { 287 log_warnx("recv_db_description: invalid " 288 "seq num, mine %x his %x", 289 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 290 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 291 return; 292 } 293 nbr->dd_seq_num++; 294 } else { 295 /* slave */ 296 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num + 1) { 297 log_warnx("recv_db_description: invalid " 298 "seq num, mine %x his %x", 299 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 300 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 301 return; 302 } 303 nbr->dd_seq_num = ntohl(dd_hdr.dd_seq_num); 304 } 305 306 /* forward to RDE and let it decide which LSAs to request */ 307 if (len > 0) { 308 nbr->dd_pending++; 309 ospfe_imsg_compose_rde(IMSG_DD, nbr->peerid, 0, 310 buf, len); 311 } 312 313 /* next packet */ 314 db_sum_list_next(nbr); 315 start_db_tx_timer(nbr); 316 317 if (!(dd_hdr.bits & OSPF_DBD_M) && 318 TAILQ_EMPTY(&nbr->db_sum_list)) 319 if (!nbr->dd_master || !nbr->dd_more) 320 nbr_fsm(nbr, NBR_EVT_XCHNG_DONE); 321 break; 322 default: 323 fatalx("recv_db_description: unknown neighbor state"); 324 } 325 326 nbr->last_rx_options = dd_hdr.opts; 327 nbr->last_rx_bits = dd_hdr.bits; 328 } 329 330 void 331 db_sum_list_add(struct nbr *nbr, struct lsa_hdr *lsa) 332 { 333 struct lsa_entry *le; 334 335 if ((le = calloc(1, sizeof(*le))) == NULL) 336 fatal("db_sum_list_add"); 337 338 TAILQ_INSERT_TAIL(&nbr->db_sum_list, le, entry); 339 le->le_lsa = lsa; 340 } 341 342 void 343 db_sum_list_next(struct nbr *nbr) 344 { 345 struct lsa_entry *le; 346 347 while ((le = TAILQ_FIRST(&nbr->db_sum_list)) != nbr->dd_end) { 348 TAILQ_REMOVE(&nbr->db_sum_list, le, entry); 349 free(le->le_lsa); 350 free(le); 351 } 352 } 353 354 void 355 db_sum_list_clr(struct nbr *nbr) 356 { 357 nbr->dd_end = NULL; 358 db_sum_list_next(nbr); 359 } 360 361 /* timers */ 362 /* ARGSUSED */ 363 void 364 db_tx_timer(int fd, short event, void *arg) 365 { 366 struct nbr *nbr = arg; 367 struct timeval tv; 368 369 switch (nbr->state) { 370 case NBR_STA_DOWN: 371 case NBR_STA_ATTEMPT: 372 case NBR_STA_INIT: 373 case NBR_STA_2_WAY: 374 case NBR_STA_SNAP: 375 return ; 376 case NBR_STA_XSTRT: 377 case NBR_STA_XCHNG: 378 case NBR_STA_LOAD: 379 case NBR_STA_FULL: 380 send_db_description(nbr); 381 break; 382 default: 383 log_debug("db_tx_timer: unknown neighbor state, " 384 "neighbor ID %s", inet_ntoa(nbr->id)); 385 break; 386 } 387 388 /* reschedule db_tx_timer but only in master mode */ 389 if (nbr->dd_master) { 390 timerclear(&tv); 391 tv.tv_sec = nbr->iface->rxmt_interval; 392 if (evtimer_add(&nbr->db_tx_timer, &tv) == -1) 393 fatal("db_tx_timer"); 394 } 395 } 396 397 void 398 start_db_tx_timer(struct nbr *nbr) 399 { 400 struct timeval tv; 401 402 if (nbr == nbr->iface->self) 403 return; 404 405 timerclear(&tv); 406 if (evtimer_add(&nbr->db_tx_timer, &tv) == -1) 407 fatal("start_db_tx_timer"); 408 } 409 410 void 411 stop_db_tx_timer(struct nbr *nbr) 412 { 413 if (nbr == nbr->iface->self) 414 return; 415 416 if (evtimer_del(&nbr->db_tx_timer) == -1) 417 fatal("stop_db_tx_timer"); 418 } 419