1 /* $OpenBSD: database.c,v 1.8 2008/12/28 17:44:45 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/in_systm.h> 24 #include <netinet/ip.h> 25 #include <arpa/inet.h> 26 #include <stdlib.h> 27 #include <string.h> 28 #include <unistd.h> 29 30 #include "ospf6d.h" 31 #include "ospf6.h" 32 #include "log.h" 33 #include "ospfe.h" 34 35 extern struct ospfd_conf *oeconf; 36 37 void db_sum_list_next(struct nbr *); 38 39 /* database description packet handling */ 40 int 41 send_db_description(struct nbr *nbr) 42 { 43 struct in6_addr dst; 44 struct db_dscrp_hdr dd_hdr; 45 struct lsa_entry *le, *nle; 46 struct buf *buf; 47 int ret = 0; 48 u_int8_t bits = 0; 49 50 if ((buf = buf_open(nbr->iface->mtu - sizeof(struct ip))) == NULL) 51 fatal("send_db_description"); 52 53 /* OSPF header */ 54 if (gen_ospf_hdr(buf, nbr->iface, PACKET_TYPE_DD)) 55 goto fail; 56 57 /* reserve space for database description header */ 58 if (buf_reserve(buf, sizeof(dd_hdr)) == NULL) 59 goto fail; 60 61 switch (nbr->state) { 62 case NBR_STA_DOWN: 63 case NBR_STA_ATTEMPT: 64 case NBR_STA_INIT: 65 case NBR_STA_2_WAY: 66 case NBR_STA_SNAP: 67 log_debug("send_db_description: cannot send packet in state %s," 68 " neighbor ID %s", nbr_state_name(nbr->state), 69 inet_ntoa(nbr->id)); 70 ret = -1; 71 goto done; 72 case NBR_STA_XSTRT: 73 bits |= OSPF_DBD_MS | OSPF_DBD_M | OSPF_DBD_I; 74 nbr->dd_more = 1; 75 break; 76 case NBR_STA_XCHNG: 77 if (nbr->dd_master) 78 bits |= OSPF_DBD_MS; 79 else 80 bits &= ~OSPF_DBD_MS; 81 82 if (TAILQ_EMPTY(&nbr->db_sum_list)) { 83 bits &= ~OSPF_DBD_M; 84 nbr->dd_more = 0; 85 } else { 86 bits |= OSPF_DBD_M; 87 nbr->dd_more = 1; 88 } 89 90 bits &= ~OSPF_DBD_I; 91 92 /* build LSA list, keep space for a possible md5 sum */ 93 for (le = TAILQ_FIRST(&nbr->db_sum_list); le != NULL && 94 buf->wpos + sizeof(struct lsa_hdr) < buf->max - 95 MD5_DIGEST_LENGTH; le = nle) { 96 nbr->dd_end = nle = TAILQ_NEXT(le, entry); 97 if (buf_add(buf, le->le_lsa, sizeof(struct lsa_hdr))) 98 goto fail; 99 } 100 break; 101 case NBR_STA_LOAD: 102 case NBR_STA_FULL: 103 if (nbr->dd_master) 104 bits |= OSPF_DBD_MS; 105 else 106 bits &= ~OSPF_DBD_MS; 107 bits &= ~OSPF_DBD_M; 108 bits &= ~OSPF_DBD_I; 109 110 nbr->dd_more = 0; 111 break; 112 default: 113 fatalx("send_db_description: unknown neighbor state"); 114 } 115 116 bzero(&dd_hdr, sizeof(dd_hdr)); 117 118 switch (nbr->iface->type) { 119 case IF_TYPE_POINTOPOINT: 120 inet_pton(AF_INET6, AllSPFRouters, &dst); 121 dd_hdr.iface_mtu = htons(nbr->iface->mtu); 122 break; 123 case IF_TYPE_BROADCAST: 124 dst = nbr->addr; 125 dd_hdr.iface_mtu = htons(nbr->iface->mtu); 126 break; 127 case IF_TYPE_NBMA: 128 case IF_TYPE_POINTOMULTIPOINT: 129 /* XXX not supported */ 130 break; 131 case IF_TYPE_VIRTUALLINK: 132 dst = nbr->iface->dst; 133 dd_hdr.iface_mtu = 0; 134 break; 135 default: 136 fatalx("send_db_description: unknown interface type"); 137 } 138 139 dd_hdr.opts = area_ospf_options(area_find(oeconf, nbr->iface->area_id)); 140 dd_hdr.bits = bits; 141 dd_hdr.dd_seq_num = htonl(nbr->dd_seq_num); 142 143 memcpy(buf_seek(buf, sizeof(struct ospf_hdr), sizeof(dd_hdr)), 144 &dd_hdr, sizeof(dd_hdr)); 145 146 /* calculate checksum */ 147 if (upd_ospf_hdr(buf, nbr->iface)) 148 goto fail; 149 150 /* transmit packet */ 151 ret = send_packet(nbr->iface, buf->buf, buf->wpos, &dst); 152 done: 153 buf_free(buf); 154 return (ret); 155 fail: 156 log_warn("send_db_description"); 157 buf_free(buf); 158 return (-1); 159 } 160 161 void 162 recv_db_description(struct nbr *nbr, char *buf, u_int16_t len) 163 { 164 struct db_dscrp_hdr dd_hdr; 165 int dupe = 0; 166 167 if (len < sizeof(dd_hdr)) { 168 log_warnx("recv_db_description: " 169 "bad packet size, neighbor ID %s", inet_ntoa(nbr->id)); 170 return; 171 } 172 memcpy(&dd_hdr, buf, sizeof(dd_hdr)); 173 buf += sizeof(dd_hdr); 174 len -= sizeof(dd_hdr); 175 176 /* db description packet sanity checks */ 177 if (ntohs(dd_hdr.iface_mtu) > nbr->iface->mtu) { 178 log_warnx("recv_db_description: invalid MTU %d sent by " 179 "neighbor ID %s, expected %d", ntohs(dd_hdr.iface_mtu), 180 inet_ntoa(nbr->id), nbr->iface->mtu); 181 return; 182 } 183 184 if (nbr->last_rx_options == dd_hdr.opts && 185 nbr->last_rx_bits == dd_hdr.bits && 186 ntohl(dd_hdr.dd_seq_num) == nbr->dd_seq_num - nbr->dd_master ? 187 1 : 0) { 188 log_debug("recv_db_description: dupe"); 189 dupe = 1; 190 } 191 192 switch (nbr->state) { 193 case NBR_STA_DOWN: 194 case NBR_STA_ATTEMPT: 195 case NBR_STA_2_WAY: 196 case NBR_STA_SNAP: 197 log_debug("recv_db_description: packet ignored in state %s, " 198 "neighbor ID %s", nbr_state_name(nbr->state), 199 inet_ntoa(nbr->id)); 200 return; 201 case NBR_STA_INIT: 202 /* evaluate dr and bdr after issuing a 2-Way event */ 203 nbr_fsm(nbr, NBR_EVT_2_WAY_RCVD); 204 if_fsm(nbr->iface, IF_EVT_NBR_CHNG); 205 if (nbr->state != NBR_STA_XSTRT) 206 return; 207 /* FALLTHROUGH */ 208 case NBR_STA_XSTRT: 209 if (dupe) 210 return; 211 /* 212 * check bits: either I,M,MS or only M 213 */ 214 if (dd_hdr.bits == (OSPF_DBD_I | OSPF_DBD_M | OSPF_DBD_MS)) { 215 /* if nbr Router ID is larger than own -> slave */ 216 if ((ntohl(nbr->id.s_addr)) > 217 ntohl(ospfe_router_id())) { 218 /* slave */ 219 nbr->dd_master = 0; 220 nbr->dd_seq_num = ntohl(dd_hdr.dd_seq_num); 221 222 /* event negotiation done */ 223 nbr_fsm(nbr, NBR_EVT_NEG_DONE); 224 } 225 } else if (!(dd_hdr.bits & (OSPF_DBD_I | OSPF_DBD_MS))) { 226 /* M only case: we are master */ 227 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num) { 228 log_warnx("recv_db_description: invalid " 229 "seq num, mine %x his %x", 230 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 231 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 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: packet ignored in " 248 "state %s (bad flags), neighbor ID %s", 249 nbr_state_name(nbr->state), inet_ntoa(nbr->id)); 250 } 251 break; 252 case NBR_STA_XCHNG: 253 case NBR_STA_LOAD: 254 case NBR_STA_FULL: 255 if (dd_hdr.bits & OSPF_DBD_I || 256 !(dd_hdr.bits & OSPF_DBD_MS) == !nbr->dd_master) { 257 log_warnx("recv_db_description: seq num mismatch, " 258 "bad flags"); 259 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 260 return; 261 } 262 263 if (nbr->last_rx_options != dd_hdr.opts) { 264 log_warnx("recv_db_description: seq num mismatch, " 265 "bad options"); 266 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 267 return; 268 } 269 270 if (dupe) { 271 if (!nbr->dd_master) 272 /* retransmit */ 273 start_db_tx_timer(nbr); 274 return; 275 } 276 277 if (nbr->state != NBR_STA_XCHNG) { 278 log_warnx("recv_db_description: invalid " 279 "seq num, mine %x his %x", 280 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 281 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 282 return; 283 } 284 285 /* sanity check dd seq number */ 286 if (nbr->dd_master) { 287 /* master */ 288 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num) { 289 log_warnx("recv_db_description: invalid " 290 "seq num, mine %x his %x", 291 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 292 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 293 return; 294 } 295 nbr->dd_seq_num++; 296 } else { 297 /* slave */ 298 if (ntohl(dd_hdr.dd_seq_num) != nbr->dd_seq_num + 1) { 299 log_warnx("recv_db_description: invalid " 300 "seq num, mine %x his %x", 301 nbr->dd_seq_num, ntohl(dd_hdr.dd_seq_num)); 302 nbr_fsm(nbr, NBR_EVT_SEQ_NUM_MIS); 303 return; 304 } 305 nbr->dd_seq_num = ntohl(dd_hdr.dd_seq_num); 306 } 307 308 /* forward to RDE and let it decide which LSAs to request */ 309 if (len > 0) { 310 nbr->dd_pending++; 311 ospfe_imsg_compose_rde(IMSG_DD, nbr->peerid, 0, 312 buf, len); 313 } 314 315 /* next packet */ 316 db_sum_list_next(nbr); 317 start_db_tx_timer(nbr); 318 319 if (!(dd_hdr.bits & OSPF_DBD_M) && 320 TAILQ_EMPTY(&nbr->db_sum_list)) 321 if (!nbr->dd_master || !nbr->dd_more) 322 nbr_fsm(nbr, NBR_EVT_XCHNG_DONE); 323 break; 324 default: 325 fatalx("recv_db_description: unknown neighbor state"); 326 } 327 328 nbr->last_rx_options = dd_hdr.opts; 329 nbr->last_rx_bits = dd_hdr.bits; 330 } 331 332 void 333 db_sum_list_add(struct nbr *nbr, struct lsa_hdr *lsa) 334 { 335 struct lsa_entry *le; 336 337 if ((le = calloc(1, sizeof(*le))) == NULL) 338 fatal("db_sum_list_add"); 339 340 TAILQ_INSERT_TAIL(&nbr->db_sum_list, le, entry); 341 le->le_lsa = lsa; 342 } 343 344 void 345 db_sum_list_next(struct nbr *nbr) 346 { 347 struct lsa_entry *le; 348 349 while ((le = TAILQ_FIRST(&nbr->db_sum_list)) != nbr->dd_end) { 350 TAILQ_REMOVE(&nbr->db_sum_list, le, entry); 351 free(le->le_lsa); 352 free(le); 353 } 354 } 355 356 void 357 db_sum_list_clr(struct nbr *nbr) 358 { 359 nbr->dd_end = NULL; 360 db_sum_list_next(nbr); 361 } 362 363 /* timers */ 364 /* ARGSUSED */ 365 void 366 db_tx_timer(int fd, short event, void *arg) 367 { 368 struct nbr *nbr = arg; 369 struct timeval tv; 370 371 switch (nbr->state) { 372 case NBR_STA_DOWN: 373 case NBR_STA_ATTEMPT: 374 case NBR_STA_INIT: 375 case NBR_STA_2_WAY: 376 case NBR_STA_SNAP: 377 return ; 378 case NBR_STA_XSTRT: 379 case NBR_STA_XCHNG: 380 case NBR_STA_LOAD: 381 case NBR_STA_FULL: 382 send_db_description(nbr); 383 break; 384 default: 385 log_debug("db_tx_timer: unknown neighbor state, " 386 "neighbor ID %s", inet_ntoa(nbr->id)); 387 break; 388 } 389 390 /* reschedule db_tx_timer but only in master mode */ 391 if (nbr->dd_master) { 392 timerclear(&tv); 393 tv.tv_sec = nbr->iface->rxmt_interval; 394 if (evtimer_add(&nbr->db_tx_timer, &tv) == -1) 395 fatal("db_tx_timer"); 396 } 397 } 398 399 void 400 start_db_tx_timer(struct nbr *nbr) 401 { 402 struct timeval tv; 403 404 if (nbr == nbr->iface->self) 405 return; 406 407 timerclear(&tv); 408 if (evtimer_add(&nbr->db_tx_timer, &tv) == -1) 409 fatal("start_db_tx_timer"); 410 } 411 412 void 413 stop_db_tx_timer(struct nbr *nbr) 414 { 415 if (nbr == nbr->iface->self) 416 return; 417 418 if (evtimer_del(&nbr->db_tx_timer) == -1) 419 fatal("stop_db_tx_timer"); 420 } 421