Annotation of embedaddon/quagga/ospfd/ospf_packet.c, revision 1.1
1.1 ! misho 1: /*
! 2: * OSPF Sending and Receiving OSPF Packets.
! 3: * Copyright (C) 1999, 2000 Toshiaki Takada
! 4: *
! 5: * This file is part of GNU Zebra.
! 6: *
! 7: * GNU Zebra is free software; you can redistribute it and/or modify it
! 8: * under the terms of the GNU General Public License as published by the
! 9: * Free Software Foundation; either version 2, or (at your option) any
! 10: * later version.
! 11: *
! 12: * GNU Zebra is distributed in the hope that it will be useful, but
! 13: * WITHOUT ANY WARRANTY; without even the implied warranty of
! 14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
! 15: * General Public License for more details.
! 16: *
! 17: * You should have received a copy of the GNU General Public License
! 18: * along with GNU Zebra; see the file COPYING. If not, write to the Free
! 19: * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
! 20: * 02111-1307, USA.
! 21: */
! 22:
! 23: #include <zebra.h>
! 24:
! 25: #include "thread.h"
! 26: #include "memory.h"
! 27: #include "linklist.h"
! 28: #include "prefix.h"
! 29: #include "if.h"
! 30: #include "table.h"
! 31: #include "sockunion.h"
! 32: #include "stream.h"
! 33: #include "log.h"
! 34: #include "sockopt.h"
! 35: #include "checksum.h"
! 36: #include "md5.h"
! 37:
! 38: #include "ospfd/ospfd.h"
! 39: #include "ospfd/ospf_network.h"
! 40: #include "ospfd/ospf_interface.h"
! 41: #include "ospfd/ospf_ism.h"
! 42: #include "ospfd/ospf_asbr.h"
! 43: #include "ospfd/ospf_lsa.h"
! 44: #include "ospfd/ospf_lsdb.h"
! 45: #include "ospfd/ospf_neighbor.h"
! 46: #include "ospfd/ospf_nsm.h"
! 47: #include "ospfd/ospf_packet.h"
! 48: #include "ospfd/ospf_spf.h"
! 49: #include "ospfd/ospf_flood.h"
! 50: #include "ospfd/ospf_dump.h"
! 51:
! 52: /* Packet Type String. */
! 53: const char *ospf_packet_type_str[] =
! 54: {
! 55: "unknown",
! 56: "Hello",
! 57: "Database Description",
! 58: "Link State Request",
! 59: "Link State Update",
! 60: "Link State Acknowledgment",
! 61: };
! 62:
! 63: /* OSPF authentication checking function */
! 64: static int
! 65: ospf_auth_type (struct ospf_interface *oi)
! 66: {
! 67: int auth_type;
! 68:
! 69: if (OSPF_IF_PARAM (oi, auth_type) == OSPF_AUTH_NOTSET)
! 70: auth_type = oi->area->auth_type;
! 71: else
! 72: auth_type = OSPF_IF_PARAM (oi, auth_type);
! 73:
! 74: /* Handle case where MD5 key list is not configured aka Cisco */
! 75: if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC &&
! 76: list_isempty (OSPF_IF_PARAM (oi, auth_crypt)))
! 77: return OSPF_AUTH_NULL;
! 78:
! 79: return auth_type;
! 80:
! 81: }
! 82:
! 83: struct ospf_packet *
! 84: ospf_packet_new (size_t size)
! 85: {
! 86: struct ospf_packet *new;
! 87:
! 88: new = XCALLOC (MTYPE_OSPF_PACKET, sizeof (struct ospf_packet));
! 89: new->s = stream_new (size);
! 90:
! 91: return new;
! 92: }
! 93:
! 94: void
! 95: ospf_packet_free (struct ospf_packet *op)
! 96: {
! 97: if (op->s)
! 98: stream_free (op->s);
! 99:
! 100: XFREE (MTYPE_OSPF_PACKET, op);
! 101:
! 102: op = NULL;
! 103: }
! 104:
! 105: struct ospf_fifo *
! 106: ospf_fifo_new ()
! 107: {
! 108: struct ospf_fifo *new;
! 109:
! 110: new = XCALLOC (MTYPE_OSPF_FIFO, sizeof (struct ospf_fifo));
! 111: return new;
! 112: }
! 113:
! 114: /* Add new packet to fifo. */
! 115: void
! 116: ospf_fifo_push (struct ospf_fifo *fifo, struct ospf_packet *op)
! 117: {
! 118: if (fifo->tail)
! 119: fifo->tail->next = op;
! 120: else
! 121: fifo->head = op;
! 122:
! 123: fifo->tail = op;
! 124:
! 125: fifo->count++;
! 126: }
! 127:
! 128: /* Add new packet to head of fifo. */
! 129: static void
! 130: ospf_fifo_push_head (struct ospf_fifo *fifo, struct ospf_packet *op)
! 131: {
! 132: op->next = fifo->head;
! 133:
! 134: if (fifo->tail == NULL)
! 135: fifo->tail = op;
! 136:
! 137: fifo->head = op;
! 138:
! 139: fifo->count++;
! 140: }
! 141:
! 142: /* Delete first packet from fifo. */
! 143: struct ospf_packet *
! 144: ospf_fifo_pop (struct ospf_fifo *fifo)
! 145: {
! 146: struct ospf_packet *op;
! 147:
! 148: op = fifo->head;
! 149:
! 150: if (op)
! 151: {
! 152: fifo->head = op->next;
! 153:
! 154: if (fifo->head == NULL)
! 155: fifo->tail = NULL;
! 156:
! 157: fifo->count--;
! 158: }
! 159:
! 160: return op;
! 161: }
! 162:
! 163: /* Return first fifo entry. */
! 164: struct ospf_packet *
! 165: ospf_fifo_head (struct ospf_fifo *fifo)
! 166: {
! 167: return fifo->head;
! 168: }
! 169:
! 170: /* Flush ospf packet fifo. */
! 171: void
! 172: ospf_fifo_flush (struct ospf_fifo *fifo)
! 173: {
! 174: struct ospf_packet *op;
! 175: struct ospf_packet *next;
! 176:
! 177: for (op = fifo->head; op; op = next)
! 178: {
! 179: next = op->next;
! 180: ospf_packet_free (op);
! 181: }
! 182: fifo->head = fifo->tail = NULL;
! 183: fifo->count = 0;
! 184: }
! 185:
! 186: /* Free ospf packet fifo. */
! 187: void
! 188: ospf_fifo_free (struct ospf_fifo *fifo)
! 189: {
! 190: ospf_fifo_flush (fifo);
! 191:
! 192: XFREE (MTYPE_OSPF_FIFO, fifo);
! 193: }
! 194:
! 195: void
! 196: ospf_packet_add (struct ospf_interface *oi, struct ospf_packet *op)
! 197: {
! 198: if (!oi->obuf)
! 199: {
! 200: zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, "
! 201: "destination %s) called with NULL obuf, ignoring "
! 202: "(please report this bug)!\n",
! 203: IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state),
! 204: ospf_packet_type_str[stream_getc_from(op->s, 1)],
! 205: inet_ntoa (op->dst));
! 206: return;
! 207: }
! 208:
! 209: /* Add packet to end of queue. */
! 210: ospf_fifo_push (oi->obuf, op);
! 211:
! 212: /* Debug of packet fifo*/
! 213: /* ospf_fifo_debug (oi->obuf); */
! 214: }
! 215:
! 216: static void
! 217: ospf_packet_add_top (struct ospf_interface *oi, struct ospf_packet *op)
! 218: {
! 219: if (!oi->obuf)
! 220: {
! 221: zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, "
! 222: "destination %s) called with NULL obuf, ignoring "
! 223: "(please report this bug)!\n",
! 224: IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state),
! 225: ospf_packet_type_str[stream_getc_from(op->s, 1)],
! 226: inet_ntoa (op->dst));
! 227: return;
! 228: }
! 229:
! 230: /* Add packet to head of queue. */
! 231: ospf_fifo_push_head (oi->obuf, op);
! 232:
! 233: /* Debug of packet fifo*/
! 234: /* ospf_fifo_debug (oi->obuf); */
! 235: }
! 236:
! 237: void
! 238: ospf_packet_delete (struct ospf_interface *oi)
! 239: {
! 240: struct ospf_packet *op;
! 241:
! 242: op = ospf_fifo_pop (oi->obuf);
! 243:
! 244: if (op)
! 245: ospf_packet_free (op);
! 246: }
! 247:
! 248: struct ospf_packet *
! 249: ospf_packet_dup (struct ospf_packet *op)
! 250: {
! 251: struct ospf_packet *new;
! 252:
! 253: if (stream_get_endp(op->s) != op->length)
! 254: /* XXX size_t */
! 255: zlog_warn ("ospf_packet_dup stream %lu ospf_packet %u size mismatch",
! 256: (u_long)STREAM_SIZE(op->s), op->length);
! 257:
! 258: /* Reserve space for MD5 authentication that may be added later. */
! 259: new = ospf_packet_new (stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE);
! 260: stream_copy (new->s, op->s);
! 261:
! 262: new->dst = op->dst;
! 263: new->length = op->length;
! 264:
! 265: return new;
! 266: }
! 267:
! 268: /* XXX inline */
! 269: static inline unsigned int
! 270: ospf_packet_authspace (struct ospf_interface *oi)
! 271: {
! 272: int auth = 0;
! 273:
! 274: if ( ospf_auth_type (oi) == OSPF_AUTH_CRYPTOGRAPHIC)
! 275: auth = OSPF_AUTH_MD5_SIZE;
! 276:
! 277: return auth;
! 278: }
! 279:
! 280: static unsigned int
! 281: ospf_packet_max (struct ospf_interface *oi)
! 282: {
! 283: int max;
! 284:
! 285: max = oi->ifp->mtu - ospf_packet_authspace(oi);
! 286:
! 287: max -= (OSPF_HEADER_SIZE + sizeof (struct ip));
! 288:
! 289: return max;
! 290: }
! 291:
! 292:
! 293: static int
! 294: ospf_check_md5_digest (struct ospf_interface *oi, struct stream *s,
! 295: u_int16_t length)
! 296: {
! 297: unsigned char *ibuf;
! 298: MD5_CTX ctx;
! 299: unsigned char digest[OSPF_AUTH_MD5_SIZE];
! 300: unsigned char *pdigest;
! 301: struct crypt_key *ck;
! 302: struct ospf_header *ospfh;
! 303: struct ospf_neighbor *nbr;
! 304:
! 305:
! 306: ibuf = STREAM_PNT (s);
! 307: ospfh = (struct ospf_header *) ibuf;
! 308:
! 309: /* Get pointer to the end of the packet. */
! 310: pdigest = ibuf + length;
! 311:
! 312: /* Get secret key. */
! 313: ck = ospf_crypt_key_lookup (OSPF_IF_PARAM (oi, auth_crypt),
! 314: ospfh->u.crypt.key_id);
! 315: if (ck == NULL)
! 316: {
! 317: zlog_warn ("interface %s: ospf_check_md5 no key %d",
! 318: IF_NAME (oi), ospfh->u.crypt.key_id);
! 319: return 0;
! 320: }
! 321:
! 322: /* check crypto seqnum. */
! 323: nbr = ospf_nbr_lookup_by_routerid (oi->nbrs, &ospfh->router_id);
! 324:
! 325: if (nbr && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum))
! 326: {
! 327: zlog_warn ("interface %s: ospf_check_md5 bad sequence %d (expect %d)",
! 328: IF_NAME (oi),
! 329: ntohl(ospfh->u.crypt.crypt_seqnum),
! 330: ntohl(nbr->crypt_seqnum));
! 331: return 0;
! 332: }
! 333:
! 334: /* Generate a digest for the ospf packet - their digest + our digest. */
! 335: memset(&ctx, 0, sizeof(ctx));
! 336: MD5Init(&ctx);
! 337: MD5Update(&ctx, ibuf, length);
! 338: MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE);
! 339: MD5Final(digest, &ctx);
! 340:
! 341: /* compare the two */
! 342: if (memcmp (pdigest, digest, OSPF_AUTH_MD5_SIZE))
! 343: {
! 344: zlog_warn ("interface %s: ospf_check_md5 checksum mismatch",
! 345: IF_NAME (oi));
! 346: return 0;
! 347: }
! 348:
! 349: /* save neighbor's crypt_seqnum */
! 350: if (nbr)
! 351: nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum;
! 352: return 1;
! 353: }
! 354:
! 355: /* This function is called from ospf_write(), it will detect the
! 356: authentication scheme and if it is MD5, it will change the sequence
! 357: and update the MD5 digest. */
! 358: static int
! 359: ospf_make_md5_digest (struct ospf_interface *oi, struct ospf_packet *op)
! 360: {
! 361: struct ospf_header *ospfh;
! 362: unsigned char digest[OSPF_AUTH_MD5_SIZE];
! 363: MD5_CTX ctx;
! 364: void *ibuf;
! 365: u_int32_t t;
! 366: struct crypt_key *ck;
! 367: const u_int8_t *auth_key;
! 368:
! 369: ibuf = STREAM_DATA (op->s);
! 370: ospfh = (struct ospf_header *) ibuf;
! 371:
! 372: if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC)
! 373: return 0;
! 374:
! 375: /* We do this here so when we dup a packet, we don't have to
! 376: waste CPU rewriting other headers.
! 377:
! 378: Note that quagga_time /deliberately/ is not used here */
! 379: t = (time(NULL) & 0xFFFFFFFF);
! 380: if (t > oi->crypt_seqnum)
! 381: oi->crypt_seqnum = t;
! 382: else
! 383: oi->crypt_seqnum++;
! 384:
! 385: ospfh->u.crypt.crypt_seqnum = htonl (oi->crypt_seqnum);
! 386:
! 387: /* Get MD5 Authentication key from auth_key list. */
! 388: if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt)))
! 389: auth_key = (const u_int8_t *) "";
! 390: else
! 391: {
! 392: ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt)));
! 393: auth_key = ck->auth_key;
! 394: }
! 395:
! 396: /* Generate a digest for the entire packet + our secret key. */
! 397: memset(&ctx, 0, sizeof(ctx));
! 398: MD5Init(&ctx);
! 399: MD5Update(&ctx, ibuf, ntohs (ospfh->length));
! 400: MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE);
! 401: MD5Final(digest, &ctx);
! 402:
! 403: /* Append md5 digest to the end of the stream. */
! 404: stream_put (op->s, digest, OSPF_AUTH_MD5_SIZE);
! 405:
! 406: /* We do *NOT* increment the OSPF header length. */
! 407: op->length = ntohs (ospfh->length) + OSPF_AUTH_MD5_SIZE;
! 408:
! 409: if (stream_get_endp(op->s) != op->length)
! 410: /* XXX size_t */
! 411: zlog_warn("ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u",
! 412: (u_long)stream_get_endp(op->s), op->length);
! 413:
! 414: return OSPF_AUTH_MD5_SIZE;
! 415: }
! 416:
! 417:
! 418: static int
! 419: ospf_ls_req_timer (struct thread *thread)
! 420: {
! 421: struct ospf_neighbor *nbr;
! 422:
! 423: nbr = THREAD_ARG (thread);
! 424: nbr->t_ls_req = NULL;
! 425:
! 426: /* Send Link State Request. */
! 427: if (ospf_ls_request_count (nbr))
! 428: ospf_ls_req_send (nbr);
! 429:
! 430: /* Set Link State Request retransmission timer. */
! 431: OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req);
! 432:
! 433: return 0;
! 434: }
! 435:
! 436: void
! 437: ospf_ls_req_event (struct ospf_neighbor *nbr)
! 438: {
! 439: if (nbr->t_ls_req)
! 440: {
! 441: thread_cancel (nbr->t_ls_req);
! 442: nbr->t_ls_req = NULL;
! 443: }
! 444: nbr->t_ls_req = thread_add_event (master, ospf_ls_req_timer, nbr, 0);
! 445: }
! 446:
! 447: /* Cyclic timer function. Fist registered in ospf_nbr_new () in
! 448: ospf_neighbor.c */
! 449: int
! 450: ospf_ls_upd_timer (struct thread *thread)
! 451: {
! 452: struct ospf_neighbor *nbr;
! 453:
! 454: nbr = THREAD_ARG (thread);
! 455: nbr->t_ls_upd = NULL;
! 456:
! 457: /* Send Link State Update. */
! 458: if (ospf_ls_retransmit_count (nbr) > 0)
! 459: {
! 460: struct list *update;
! 461: struct ospf_lsdb *lsdb;
! 462: int i;
! 463: int retransmit_interval;
! 464:
! 465: retransmit_interval = OSPF_IF_PARAM (nbr->oi, retransmit_interval);
! 466:
! 467: lsdb = &nbr->ls_rxmt;
! 468: update = list_new ();
! 469:
! 470: for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++)
! 471: {
! 472: struct route_table *table = lsdb->type[i].db;
! 473: struct route_node *rn;
! 474:
! 475: for (rn = route_top (table); rn; rn = route_next (rn))
! 476: {
! 477: struct ospf_lsa *lsa;
! 478:
! 479: if ((lsa = rn->info) != NULL)
! 480: /* Don't retransmit an LSA if we received it within
! 481: the last RxmtInterval seconds - this is to allow the
! 482: neighbour a chance to acknowledge the LSA as it may
! 483: have ben just received before the retransmit timer
! 484: fired. This is a small tweak to what is in the RFC,
! 485: but it will cut out out a lot of retransmit traffic
! 486: - MAG */
! 487: if (tv_cmp (tv_sub (recent_relative_time (), lsa->tv_recv),
! 488: int2tv (retransmit_interval)) >= 0)
! 489: listnode_add (update, rn->info);
! 490: }
! 491: }
! 492:
! 493: if (listcount (update) > 0)
! 494: ospf_ls_upd_send (nbr, update, OSPF_SEND_PACKET_DIRECT);
! 495: list_delete (update);
! 496: }
! 497:
! 498: /* Set LS Update retransmission timer. */
! 499: OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd);
! 500:
! 501: return 0;
! 502: }
! 503:
! 504: int
! 505: ospf_ls_ack_timer (struct thread *thread)
! 506: {
! 507: struct ospf_interface *oi;
! 508:
! 509: oi = THREAD_ARG (thread);
! 510: oi->t_ls_ack = NULL;
! 511:
! 512: /* Send Link State Acknowledgment. */
! 513: if (listcount (oi->ls_ack) > 0)
! 514: ospf_ls_ack_send_delayed (oi);
! 515:
! 516: /* Set LS Ack timer. */
! 517: OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack);
! 518:
! 519: return 0;
! 520: }
! 521:
! 522: #ifdef WANT_OSPF_WRITE_FRAGMENT
! 523: static void
! 524: ospf_write_frags (int fd, struct ospf_packet *op, struct ip *iph,
! 525: struct msghdr *msg, unsigned int maxdatasize,
! 526: unsigned int mtu, int flags, u_char type)
! 527: {
! 528: #define OSPF_WRITE_FRAG_SHIFT 3
! 529: u_int16_t offset;
! 530: struct iovec *iovp;
! 531: int ret;
! 532:
! 533: assert ( op->length == stream_get_endp(op->s) );
! 534: assert (msg->msg_iovlen == 2);
! 535:
! 536: /* we can but try.
! 537: *
! 538: * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
! 539: * well as the IP_MF flag, making this all quite pointless.
! 540: *
! 541: * However, for a system on which IP_MF is left alone, and ip_id left
! 542: * alone or else which sets same ip_id for each fragment this might
! 543: * work, eg linux.
! 544: *
! 545: * XXX-TODO: It would be much nicer to have the kernel's use their
! 546: * existing fragmentation support to do this for us. Bugs/RFEs need to
! 547: * be raised against the various kernels.
! 548: */
! 549:
! 550: /* set More Frag */
! 551: iph->ip_off |= IP_MF;
! 552:
! 553: /* ip frag offset is expressed in units of 8byte words */
! 554: offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT;
! 555:
! 556: iovp = &msg->msg_iov[1];
! 557:
! 558: while ( (stream_get_endp(op->s) - stream_get_getp (op->s))
! 559: > maxdatasize )
! 560: {
! 561: /* data length of this frag is to next offset value */
! 562: iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT;
! 563: iph->ip_len = iovp->iov_len + sizeof (struct ip);
! 564: assert (iph->ip_len <= mtu);
! 565:
! 566: sockopt_iphdrincl_swab_htosys (iph);
! 567:
! 568: ret = sendmsg (fd, msg, flags);
! 569:
! 570: sockopt_iphdrincl_swab_systoh (iph);
! 571:
! 572: if (ret < 0)
! 573: zlog_warn ("*** ospf_write_frags: sendmsg failed to %s,"
! 574: " id %d, off %d, len %d, mtu %u failed with %s",
! 575: inet_ntoa (iph->ip_dst),
! 576: iph->ip_id,
! 577: iph->ip_off,
! 578: iph->ip_len,
! 579: mtu,
! 580: safe_strerror (errno));
! 581:
! 582: if (IS_DEBUG_OSPF_PACKET (type - 1, SEND))
! 583: {
! 584: zlog_debug ("ospf_write_frags: sent id %d, off %d, len %d to %s\n",
! 585: iph->ip_id, iph->ip_off, iph->ip_len,
! 586: inet_ntoa (iph->ip_dst));
! 587: if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL))
! 588: {
! 589: zlog_debug ("-----------------IP Header Dump----------------------");
! 590: ospf_ip_header_dump (iph);
! 591: zlog_debug ("-----------------------------------------------------");
! 592: }
! 593: }
! 594:
! 595: iph->ip_off += offset;
! 596: stream_forward_getp (op->s, iovp->iov_len);
! 597: iovp->iov_base = STREAM_PNT (op->s);
! 598: }
! 599:
! 600: /* setup for final fragment */
! 601: iovp->iov_len = stream_get_endp(op->s) - stream_get_getp (op->s);
! 602: iph->ip_len = iovp->iov_len + sizeof (struct ip);
! 603: iph->ip_off &= (~IP_MF);
! 604: }
! 605: #endif /* WANT_OSPF_WRITE_FRAGMENT */
! 606:
! 607: static int
! 608: ospf_write (struct thread *thread)
! 609: {
! 610: struct ospf *ospf = THREAD_ARG (thread);
! 611: struct ospf_interface *oi;
! 612: struct ospf_packet *op;
! 613: struct sockaddr_in sa_dst;
! 614: struct ip iph;
! 615: struct msghdr msg;
! 616: struct iovec iov[2];
! 617: u_char type;
! 618: int ret;
! 619: int flags = 0;
! 620: struct listnode *node;
! 621: #ifdef WANT_OSPF_WRITE_FRAGMENT
! 622: static u_int16_t ipid = 0;
! 623: #endif /* WANT_OSPF_WRITE_FRAGMENT */
! 624: u_int16_t maxdatasize;
! 625: #define OSPF_WRITE_IPHL_SHIFT 2
! 626:
! 627: ospf->t_write = NULL;
! 628:
! 629: node = listhead (ospf->oi_write_q);
! 630: assert (node);
! 631: oi = listgetdata (node);
! 632: assert (oi);
! 633:
! 634: #ifdef WANT_OSPF_WRITE_FRAGMENT
! 635: /* seed ipid static with low order bits of time */
! 636: if (ipid == 0)
! 637: ipid = (time(NULL) & 0xffff);
! 638: #endif /* WANT_OSPF_WRITE_FRAGMENT */
! 639:
! 640: /* convenience - max OSPF data per packet,
! 641: * and reliability - not more data, than our
! 642: * socket can accept
! 643: */
! 644: maxdatasize = MIN (oi->ifp->mtu, ospf->maxsndbuflen) -
! 645: sizeof (struct ip);
! 646:
! 647: /* Get one packet from queue. */
! 648: op = ospf_fifo_head (oi->obuf);
! 649: assert (op);
! 650: assert (op->length >= OSPF_HEADER_SIZE);
! 651:
! 652: if (op->dst.s_addr == htonl (OSPF_ALLSPFROUTERS)
! 653: || op->dst.s_addr == htonl (OSPF_ALLDROUTERS))
! 654: ospf_if_ipmulticast (ospf, oi->address, oi->ifp->ifindex);
! 655:
! 656: /* Rewrite the md5 signature & update the seq */
! 657: ospf_make_md5_digest (oi, op);
! 658:
! 659: /* Retrieve OSPF packet type. */
! 660: stream_set_getp (op->s, 1);
! 661: type = stream_getc (op->s);
! 662:
! 663: /* reset get pointer */
! 664: stream_set_getp (op->s, 0);
! 665:
! 666: memset (&iph, 0, sizeof (struct ip));
! 667: memset (&sa_dst, 0, sizeof (sa_dst));
! 668:
! 669: sa_dst.sin_family = AF_INET;
! 670: #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
! 671: sa_dst.sin_len = sizeof(sa_dst);
! 672: #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
! 673: sa_dst.sin_addr = op->dst;
! 674: sa_dst.sin_port = htons (0);
! 675:
! 676: /* Set DONTROUTE flag if dst is unicast. */
! 677: if (oi->type != OSPF_IFTYPE_VIRTUALLINK)
! 678: if (!IN_MULTICAST (htonl (op->dst.s_addr)))
! 679: flags = MSG_DONTROUTE;
! 680:
! 681: iph.ip_hl = sizeof (struct ip) >> OSPF_WRITE_IPHL_SHIFT;
! 682: /* it'd be very strange for header to not be 4byte-word aligned but.. */
! 683: if ( sizeof (struct ip)
! 684: > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) )
! 685: iph.ip_hl++; /* we presume sizeof struct ip cant overflow ip_hl.. */
! 686:
! 687: iph.ip_v = IPVERSION;
! 688: iph.ip_tos = IPTOS_PREC_INTERNETCONTROL;
! 689: iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length;
! 690:
! 691: #if defined(__DragonFly__)
! 692: /*
! 693: * DragonFly's raw socket expects ip_len/ip_off in network byte order.
! 694: */
! 695: iph.ip_len = htons(iph.ip_len);
! 696: #endif
! 697:
! 698: #ifdef WANT_OSPF_WRITE_FRAGMENT
! 699: /* XXX-MT: not thread-safe at all..
! 700: * XXX: this presumes this is only programme sending OSPF packets
! 701: * otherwise, no guarantee ipid will be unique
! 702: */
! 703: iph.ip_id = ++ipid;
! 704: #endif /* WANT_OSPF_WRITE_FRAGMENT */
! 705:
! 706: iph.ip_off = 0;
! 707: if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
! 708: iph.ip_ttl = OSPF_VL_IP_TTL;
! 709: else
! 710: iph.ip_ttl = OSPF_IP_TTL;
! 711: iph.ip_p = IPPROTO_OSPFIGP;
! 712: iph.ip_sum = 0;
! 713: iph.ip_src.s_addr = oi->address->u.prefix4.s_addr;
! 714: iph.ip_dst.s_addr = op->dst.s_addr;
! 715:
! 716: memset (&msg, 0, sizeof (msg));
! 717: msg.msg_name = (caddr_t) &sa_dst;
! 718: msg.msg_namelen = sizeof (sa_dst);
! 719: msg.msg_iov = iov;
! 720: msg.msg_iovlen = 2;
! 721: iov[0].iov_base = (char*)&iph;
! 722: iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT;
! 723: iov[1].iov_base = STREAM_PNT (op->s);
! 724: iov[1].iov_len = op->length;
! 725:
! 726: /* Sadly we can not rely on kernels to fragment packets because of either
! 727: * IP_HDRINCL and/or multicast destination being set.
! 728: */
! 729: #ifdef WANT_OSPF_WRITE_FRAGMENT
! 730: if ( op->length > maxdatasize )
! 731: ospf_write_frags (ospf->fd, op, &iph, &msg, maxdatasize,
! 732: oi->ifp->mtu, flags, type);
! 733: #endif /* WANT_OSPF_WRITE_FRAGMENT */
! 734:
! 735: /* send final fragment (could be first) */
! 736: sockopt_iphdrincl_swab_htosys (&iph);
! 737: ret = sendmsg (ospf->fd, &msg, flags);
! 738: sockopt_iphdrincl_swab_systoh (&iph);
! 739:
! 740: if (ret < 0)
! 741: zlog_warn ("*** sendmsg in ospf_write failed to %s, "
! 742: "id %d, off %d, len %d, interface %s, mtu %u: %s",
! 743: inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len,
! 744: oi->ifp->name, oi->ifp->mtu, safe_strerror (errno));
! 745:
! 746: /* Show debug sending packet. */
! 747: if (IS_DEBUG_OSPF_PACKET (type - 1, SEND))
! 748: {
! 749: if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL))
! 750: {
! 751: zlog_debug ("-----------------------------------------------------");
! 752: ospf_ip_header_dump (&iph);
! 753: stream_set_getp (op->s, 0);
! 754: ospf_packet_dump (op->s);
! 755: }
! 756:
! 757: zlog_debug ("%s sent to [%s] via [%s].",
! 758: ospf_packet_type_str[type], inet_ntoa (op->dst),
! 759: IF_NAME (oi));
! 760:
! 761: if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL))
! 762: zlog_debug ("-----------------------------------------------------");
! 763: }
! 764:
! 765: /* Now delete packet from queue. */
! 766: ospf_packet_delete (oi);
! 767:
! 768: if (ospf_fifo_head (oi->obuf) == NULL)
! 769: {
! 770: oi->on_write_q = 0;
! 771: list_delete_node (ospf->oi_write_q, node);
! 772: }
! 773:
! 774: /* If packets still remain in queue, call write thread. */
! 775: if (!list_isempty (ospf->oi_write_q))
! 776: ospf->t_write =
! 777: thread_add_write (master, ospf_write, ospf, ospf->fd);
! 778:
! 779: return 0;
! 780: }
! 781:
! 782: /* OSPF Hello message read -- RFC2328 Section 10.5. */
! 783: static void
! 784: ospf_hello (struct ip *iph, struct ospf_header *ospfh,
! 785: struct stream * s, struct ospf_interface *oi, int size)
! 786: {
! 787: struct ospf_hello *hello;
! 788: struct ospf_neighbor *nbr;
! 789: int old_state;
! 790: struct prefix p;
! 791:
! 792: /* increment statistics. */
! 793: oi->hello_in++;
! 794:
! 795: hello = (struct ospf_hello *) STREAM_PNT (s);
! 796:
! 797: /* If Hello is myself, silently discard. */
! 798: if (IPV4_ADDR_SAME (&ospfh->router_id, &oi->ospf->router_id))
! 799: {
! 800: if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV))
! 801: {
! 802: zlog_debug ("ospf_header[%s/%s]: selforiginated, "
! 803: "dropping.",
! 804: ospf_packet_type_str[ospfh->type],
! 805: inet_ntoa (iph->ip_src));
! 806: }
! 807: return;
! 808: }
! 809:
! 810: /* get neighbor prefix. */
! 811: p.family = AF_INET;
! 812: p.prefixlen = ip_masklen (hello->network_mask);
! 813: p.u.prefix4 = iph->ip_src;
! 814:
! 815: /* Compare network mask. */
! 816: /* Checking is ignored for Point-to-Point and Virtual link. */
! 817: if (oi->type != OSPF_IFTYPE_POINTOPOINT
! 818: && oi->type != OSPF_IFTYPE_VIRTUALLINK)
! 819: if (oi->address->prefixlen != p.prefixlen)
! 820: {
! 821: zlog_warn ("Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
! 822: inet_ntoa(ospfh->router_id), IF_NAME(oi),
! 823: (int)oi->address->prefixlen, (int)p.prefixlen);
! 824: return;
! 825: }
! 826:
! 827: /* Compare Router Dead Interval. */
! 828: if (OSPF_IF_PARAM (oi, v_wait) != ntohl (hello->dead_interval))
! 829: {
! 830: zlog_warn ("Packet %s [Hello:RECV]: RouterDeadInterval mismatch "
! 831: "(expected %u, but received %u).",
! 832: inet_ntoa(ospfh->router_id),
! 833: OSPF_IF_PARAM(oi, v_wait), ntohl(hello->dead_interval));
! 834: return;
! 835: }
! 836:
! 837: /* Compare Hello Interval - ignored if fast-hellos are set. */
! 838: if (OSPF_IF_PARAM (oi, fast_hello) == 0)
! 839: {
! 840: if (OSPF_IF_PARAM (oi, v_hello) != ntohs (hello->hello_interval))
! 841: {
! 842: zlog_warn ("Packet %s [Hello:RECV]: HelloInterval mismatch "
! 843: "(expected %u, but received %u).",
! 844: inet_ntoa(ospfh->router_id),
! 845: OSPF_IF_PARAM(oi, v_hello), ntohs(hello->hello_interval));
! 846: return;
! 847: }
! 848: }
! 849:
! 850: if (IS_DEBUG_OSPF_EVENT)
! 851: zlog_debug ("Packet %s [Hello:RECV]: Options %s",
! 852: inet_ntoa (ospfh->router_id),
! 853: ospf_options_dump (hello->options));
! 854:
! 855: /* Compare options. */
! 856: #define REJECT_IF_TBIT_ON 1 /* XXX */
! 857: #ifdef REJECT_IF_TBIT_ON
! 858: if (CHECK_FLAG (hello->options, OSPF_OPTION_T))
! 859: {
! 860: /*
! 861: * This router does not support non-zero TOS.
! 862: * Drop this Hello packet not to establish neighbor relationship.
! 863: */
! 864: zlog_warn ("Packet %s [Hello:RECV]: T-bit on, drop it.",
! 865: inet_ntoa (ospfh->router_id));
! 866: return;
! 867: }
! 868: #endif /* REJECT_IF_TBIT_ON */
! 869:
! 870: #ifdef HAVE_OPAQUE_LSA
! 871: if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)
! 872: && CHECK_FLAG (hello->options, OSPF_OPTION_O))
! 873: {
! 874: /*
! 875: * This router does know the correct usage of O-bit
! 876: * the bit should be set in DD packet only.
! 877: */
! 878: zlog_warn ("Packet %s [Hello:RECV]: O-bit abuse?",
! 879: inet_ntoa (ospfh->router_id));
! 880: #ifdef STRICT_OBIT_USAGE_CHECK
! 881: return; /* Reject this packet. */
! 882: #else /* STRICT_OBIT_USAGE_CHECK */
! 883: UNSET_FLAG (hello->options, OSPF_OPTION_O); /* Ignore O-bit. */
! 884: #endif /* STRICT_OBIT_USAGE_CHECK */
! 885: }
! 886: #endif /* HAVE_OPAQUE_LSA */
! 887:
! 888: /* new for NSSA is to ensure that NP is on and E is off */
! 889:
! 890: if (oi->area->external_routing == OSPF_AREA_NSSA)
! 891: {
! 892: if (! (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_NP)
! 893: && CHECK_FLAG (hello->options, OSPF_OPTION_NP)
! 894: && ! CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E)
! 895: && ! CHECK_FLAG (hello->options, OSPF_OPTION_E)))
! 896: {
! 897: zlog_warn ("NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", inet_ntoa (ospfh->router_id), OPTIONS (oi), hello->options);
! 898: return;
! 899: }
! 900: if (IS_DEBUG_OSPF_NSSA)
! 901: zlog_debug ("NSSA-Hello:RECV:Packet from %s:", inet_ntoa(ospfh->router_id));
! 902: }
! 903: else
! 904: /* The setting of the E-bit found in the Hello Packet's Options
! 905: field must match this area's ExternalRoutingCapability A
! 906: mismatch causes processing to stop and the packet to be
! 907: dropped. The setting of the rest of the bits in the Hello
! 908: Packet's Options field should be ignored. */
! 909: if (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) !=
! 910: CHECK_FLAG (hello->options, OSPF_OPTION_E))
! 911: {
! 912: zlog_warn ("Packet %s [Hello:RECV]: my options: %x, his options %x",
! 913: inet_ntoa(ospfh->router_id), OPTIONS (oi), hello->options);
! 914: return;
! 915: }
! 916:
! 917: /* get neighbour struct */
! 918: nbr = ospf_nbr_get (oi, ospfh, iph, &p);
! 919:
! 920: /* neighbour must be valid, ospf_nbr_get creates if none existed */
! 921: assert (nbr);
! 922:
! 923: old_state = nbr->state;
! 924:
! 925: /* Add event to thread. */
! 926: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived);
! 927:
! 928: /* RFC2328 Section 9.5.1
! 929: If the router is not eligible to become Designated Router,
! 930: (snip) It must also send an Hello Packet in reply to an
! 931: Hello Packet received from any eligible neighbor (other than
! 932: the current Designated Router and Backup Designated Router). */
! 933: if (oi->type == OSPF_IFTYPE_NBMA)
! 934: if (PRIORITY(oi) == 0 && hello->priority > 0
! 935: && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src)
! 936: && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src))
! 937: OSPF_NSM_TIMER_ON (nbr->t_hello_reply, ospf_hello_reply_timer,
! 938: OSPF_HELLO_REPLY_DELAY);
! 939:
! 940: /* on NBMA network type, it happens to receive bidirectional Hello packet
! 941: without advance 1-Way Received event.
! 942: To avoid incorrect DR-seletion, raise 1-Way Received event.*/
! 943: if (oi->type == OSPF_IFTYPE_NBMA &&
! 944: (old_state == NSM_Down || old_state == NSM_Attempt))
! 945: {
! 946: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_OneWayReceived);
! 947: nbr->priority = hello->priority;
! 948: nbr->d_router = hello->d_router;
! 949: nbr->bd_router = hello->bd_router;
! 950: return;
! 951: }
! 952:
! 953: if (ospf_nbr_bidirectional (&oi->ospf->router_id, hello->neighbors,
! 954: size - OSPF_HELLO_MIN_SIZE))
! 955: {
! 956: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_TwoWayReceived);
! 957: nbr->options |= hello->options;
! 958: }
! 959: else
! 960: {
! 961: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_OneWayReceived);
! 962: /* Set neighbor information. */
! 963: nbr->priority = hello->priority;
! 964: nbr->d_router = hello->d_router;
! 965: nbr->bd_router = hello->bd_router;
! 966: return;
! 967: }
! 968:
! 969: /* If neighbor itself declares DR and no BDR exists,
! 970: cause event BackupSeen */
! 971: if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router))
! 972: if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting)
! 973: OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen);
! 974:
! 975: /* neighbor itself declares BDR. */
! 976: if (oi->state == ISM_Waiting &&
! 977: IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router))
! 978: OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen);
! 979:
! 980: /* had not previously. */
! 981: if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router) &&
! 982: IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->d_router)) ||
! 983: (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->d_router) &&
! 984: IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->d_router)))
! 985: OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange);
! 986:
! 987: /* had not previously. */
! 988: if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router) &&
! 989: IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->bd_router)) ||
! 990: (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->bd_router) &&
! 991: IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->bd_router)))
! 992: OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange);
! 993:
! 994: /* Neighbor priority check. */
! 995: if (nbr->priority >= 0 && nbr->priority != hello->priority)
! 996: OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange);
! 997:
! 998: /* Set neighbor information. */
! 999: nbr->priority = hello->priority;
! 1000: nbr->d_router = hello->d_router;
! 1001: nbr->bd_router = hello->bd_router;
! 1002: }
! 1003:
! 1004: /* Save DD flags/options/Seqnum received. */
! 1005: static void
! 1006: ospf_db_desc_save_current (struct ospf_neighbor *nbr,
! 1007: struct ospf_db_desc *dd)
! 1008: {
! 1009: nbr->last_recv.flags = dd->flags;
! 1010: nbr->last_recv.options = dd->options;
! 1011: nbr->last_recv.dd_seqnum = ntohl (dd->dd_seqnum);
! 1012: }
! 1013:
! 1014: /* Process rest of DD packet. */
! 1015: static void
! 1016: ospf_db_desc_proc (struct stream *s, struct ospf_interface *oi,
! 1017: struct ospf_neighbor *nbr, struct ospf_db_desc *dd,
! 1018: u_int16_t size)
! 1019: {
! 1020: struct ospf_lsa *new, *find;
! 1021: struct lsa_header *lsah;
! 1022:
! 1023: stream_forward_getp (s, OSPF_DB_DESC_MIN_SIZE);
! 1024: for (size -= OSPF_DB_DESC_MIN_SIZE;
! 1025: size >= OSPF_LSA_HEADER_SIZE; size -= OSPF_LSA_HEADER_SIZE)
! 1026: {
! 1027: lsah = (struct lsa_header *) STREAM_PNT (s);
! 1028: stream_forward_getp (s, OSPF_LSA_HEADER_SIZE);
! 1029:
! 1030: /* Unknown LS type. */
! 1031: if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA)
! 1032: {
! 1033: zlog_warn ("Packet [DD:RECV]: Unknown LS type %d.", lsah->type);
! 1034: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch);
! 1035: return;
! 1036: }
! 1037:
! 1038: #ifdef HAVE_OPAQUE_LSA
! 1039: if (IS_OPAQUE_LSA (lsah->type)
! 1040: && ! CHECK_FLAG (nbr->options, OSPF_OPTION_O))
! 1041: {
! 1042: zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id));
! 1043: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch);
! 1044: return;
! 1045: }
! 1046: #endif /* HAVE_OPAQUE_LSA */
! 1047:
! 1048: switch (lsah->type)
! 1049: {
! 1050: case OSPF_AS_EXTERNAL_LSA:
! 1051: #ifdef HAVE_OPAQUE_LSA
! 1052: case OSPF_OPAQUE_AS_LSA:
! 1053: #endif /* HAVE_OPAQUE_LSA */
! 1054: /* Check for stub area. Reject if AS-External from stub but
! 1055: allow if from NSSA. */
! 1056: if (oi->area->external_routing == OSPF_AREA_STUB)
! 1057: {
! 1058: zlog_warn ("Packet [DD:RECV]: LSA[Type%d:%s] from %s area.",
! 1059: lsah->type, inet_ntoa (lsah->id),
! 1060: (oi->area->external_routing == OSPF_AREA_STUB) ?\
! 1061: "STUB" : "NSSA");
! 1062: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch);
! 1063: return;
! 1064: }
! 1065: break;
! 1066: default:
! 1067: break;
! 1068: }
! 1069:
! 1070: /* Create LS-request object. */
! 1071: new = ospf_ls_request_new (lsah);
! 1072:
! 1073: /* Lookup received LSA, then add LS request list. */
! 1074: find = ospf_lsa_lookup_by_header (oi->area, lsah);
! 1075:
! 1076: /* ospf_lsa_more_recent is fine with NULL pointers */
! 1077: switch (ospf_lsa_more_recent (find, new))
! 1078: {
! 1079: case -1:
! 1080: /* Neighbour has a more recent LSA, we must request it */
! 1081: ospf_ls_request_add (nbr, new);
! 1082: case 0:
! 1083: /* If we have a copy of this LSA, it's either less recent
! 1084: * and we're requesting it from neighbour (the case above), or
! 1085: * it's as recent and we both have same copy (this case).
! 1086: *
! 1087: * In neither of these two cases is there any point in
! 1088: * describing our copy of the LSA to the neighbour in a
! 1089: * DB-Summary packet, if we're still intending to do so.
! 1090: *
! 1091: * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
! 1092: * backward compatible optimisation to OSPF DB Exchange /
! 1093: * DB Description process implemented here.
! 1094: */
! 1095: if (find)
! 1096: ospf_lsdb_delete (&nbr->db_sum, find);
! 1097: ospf_lsa_discard (new);
! 1098: break;
! 1099: default:
! 1100: /* We have the more recent copy, nothing specific to do:
! 1101: * - no need to request neighbours stale copy
! 1102: * - must leave DB summary list copy alone
! 1103: */
! 1104: if (IS_DEBUG_OSPF_EVENT)
! 1105: zlog_debug ("Packet [DD:RECV]: LSA received Type %d, "
! 1106: "ID %s is not recent.", lsah->type, inet_ntoa (lsah->id));
! 1107: ospf_lsa_discard (new);
! 1108: }
! 1109: }
! 1110:
! 1111: /* Master */
! 1112: if (IS_SET_DD_MS (nbr->dd_flags))
! 1113: {
! 1114: nbr->dd_seqnum++;
! 1115:
! 1116: /* Both sides have no More, then we're done with Exchange */
! 1117: if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags))
! 1118: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone);
! 1119: else
! 1120: ospf_db_desc_send (nbr);
! 1121: }
! 1122: /* Slave */
! 1123: else
! 1124: {
! 1125: nbr->dd_seqnum = ntohl (dd->dd_seqnum);
! 1126:
! 1127: /* Send DD packet in reply.
! 1128: *
! 1129: * Must be done to acknowledge the Master's DD, regardless of
! 1130: * whether we have more LSAs ourselves to describe.
! 1131: *
! 1132: * This function will clear the 'More' bit, if after this DD
! 1133: * we have no more LSAs to describe to the master..
! 1134: */
! 1135: ospf_db_desc_send (nbr);
! 1136:
! 1137: /* Slave can raise ExchangeDone now, if master is also done */
! 1138: if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags))
! 1139: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone);
! 1140: }
! 1141:
! 1142: /* Save received neighbor values from DD. */
! 1143: ospf_db_desc_save_current (nbr, dd);
! 1144: }
! 1145:
! 1146: static int
! 1147: ospf_db_desc_is_dup (struct ospf_db_desc *dd, struct ospf_neighbor *nbr)
! 1148: {
! 1149: /* Is DD duplicated? */
! 1150: if (dd->options == nbr->last_recv.options &&
! 1151: dd->flags == nbr->last_recv.flags &&
! 1152: dd->dd_seqnum == htonl (nbr->last_recv.dd_seqnum))
! 1153: return 1;
! 1154:
! 1155: return 0;
! 1156: }
! 1157:
! 1158: /* OSPF Database Description message read -- RFC2328 Section 10.6. */
! 1159: static void
! 1160: ospf_db_desc (struct ip *iph, struct ospf_header *ospfh,
! 1161: struct stream *s, struct ospf_interface *oi, u_int16_t size)
! 1162: {
! 1163: struct ospf_db_desc *dd;
! 1164: struct ospf_neighbor *nbr;
! 1165:
! 1166: /* Increment statistics. */
! 1167: oi->db_desc_in++;
! 1168:
! 1169: dd = (struct ospf_db_desc *) STREAM_PNT (s);
! 1170:
! 1171: nbr = ospf_nbr_lookup (oi, iph, ospfh);
! 1172: if (nbr == NULL)
! 1173: {
! 1174: zlog_warn ("Packet[DD]: Unknown Neighbor %s",
! 1175: inet_ntoa (ospfh->router_id));
! 1176: return;
! 1177: }
! 1178:
! 1179: /* Check MTU. */
! 1180: if ((OSPF_IF_PARAM (oi, mtu_ignore) == 0) &&
! 1181: (ntohs (dd->mtu) > oi->ifp->mtu))
! 1182: {
! 1183: zlog_warn ("Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u",
! 1184: inet_ntoa (nbr->router_id), ntohs (dd->mtu),
! 1185: IF_NAME (oi), oi->ifp->mtu);
! 1186: return;
! 1187: }
! 1188:
! 1189: /*
! 1190: * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is not
! 1191: * required. In fact at least JunOS sends DD packets with P bit clear.
! 1192: * Until proper solution is developped, this hack should help.
! 1193: *
! 1194: * Update: According to the RFCs, N bit is specified /only/ for Hello
! 1195: * options, unfortunately its use in DD options is not specified. Hence some
! 1196: * implementations follow E-bit semantics and set it in DD options, and some
! 1197: * treat it as unspecified and hence follow the directive "default for
! 1198: * options is clear", ie unset.
! 1199: *
! 1200: * Reset the flag, as ospfd follows E-bit semantics.
! 1201: */
! 1202: if ( (oi->area->external_routing == OSPF_AREA_NSSA)
! 1203: && (CHECK_FLAG (nbr->options, OSPF_OPTION_NP))
! 1204: && (!CHECK_FLAG (dd->options, OSPF_OPTION_NP)) )
! 1205: {
! 1206: if (IS_DEBUG_OSPF_EVENT)
! 1207: zlog_debug ("Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options",
! 1208: inet_ntoa (nbr->router_id) );
! 1209: SET_FLAG (dd->options, OSPF_OPTION_NP);
! 1210: }
! 1211:
! 1212: #ifdef REJECT_IF_TBIT_ON
! 1213: if (CHECK_FLAG (dd->options, OSPF_OPTION_T))
! 1214: {
! 1215: /*
! 1216: * In Hello protocol, optional capability must have checked
! 1217: * to prevent this T-bit enabled router be my neighbor.
! 1218: */
! 1219: zlog_warn ("Packet[DD]: Neighbor %s: T-bit on?", inet_ntoa (nbr->router_id));
! 1220: return;
! 1221: }
! 1222: #endif /* REJECT_IF_TBIT_ON */
! 1223:
! 1224: #ifdef HAVE_OPAQUE_LSA
! 1225: if (CHECK_FLAG (dd->options, OSPF_OPTION_O)
! 1226: && !CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE))
! 1227: {
! 1228: /*
! 1229: * This node is not configured to handle O-bit, for now.
! 1230: * Clear it to ignore unsupported capability proposed by neighbor.
! 1231: */
! 1232: UNSET_FLAG (dd->options, OSPF_OPTION_O);
! 1233: }
! 1234: #endif /* HAVE_OPAQUE_LSA */
! 1235:
! 1236: /* Add event to thread. */
! 1237: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived);
! 1238:
! 1239: /* Process DD packet by neighbor status. */
! 1240: switch (nbr->state)
! 1241: {
! 1242: case NSM_Down:
! 1243: case NSM_Attempt:
! 1244: case NSM_TwoWay:
! 1245: zlog_warn ("Packet[DD]: Neighbor %s state is %s, packet discarded.",
! 1246: inet_ntoa(nbr->router_id),
! 1247: LOOKUP (ospf_nsm_state_msg, nbr->state));
! 1248: break;
! 1249: case NSM_Init:
! 1250: OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived);
! 1251: /* If the new state is ExStart, the processing of the current
! 1252: packet should then continue in this new state by falling
! 1253: through to case ExStart below. */
! 1254: if (nbr->state != NSM_ExStart)
! 1255: break;
! 1256: case NSM_ExStart:
! 1257: /* Initial DBD */
! 1258: if ((IS_SET_DD_ALL (dd->flags) == OSPF_DD_FLAG_ALL) &&
! 1259: (size == OSPF_DB_DESC_MIN_SIZE))
! 1260: {
! 1261: if (IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) > 0)
! 1262: {
! 1263: /* We're Slave---obey */
! 1264: zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Slave).",
! 1265: inet_ntoa(nbr->router_id));
! 1266: nbr->dd_seqnum = ntohl (dd->dd_seqnum);
! 1267:
! 1268: /* Reset I/MS */
! 1269: UNSET_FLAG (nbr->dd_flags, (OSPF_DD_FLAG_MS|OSPF_DD_FLAG_I));
! 1270: }
! 1271: else
! 1272: {
! 1273: /* We're Master, ignore the initial DBD from Slave */
! 1274: zlog_info ("Packet[DD]: Neighbor %s: Initial DBD from Slave, "
! 1275: "ignoring.", inet_ntoa(nbr->router_id));
! 1276: break;
! 1277: }
! 1278: }
! 1279: /* Ack from the Slave */
! 1280: else if (!IS_SET_DD_MS (dd->flags) && !IS_SET_DD_I (dd->flags) &&
! 1281: ntohl (dd->dd_seqnum) == nbr->dd_seqnum &&
! 1282: IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) < 0)
! 1283: {
! 1284: zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Master).",
! 1285: inet_ntoa(nbr->router_id));
! 1286: /* Reset I, leaving MS */
! 1287: UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_I);
! 1288: }
! 1289: else
! 1290: {
! 1291: zlog_warn ("Packet[DD]: Neighbor %s Negotiation fails.",
! 1292: inet_ntoa(nbr->router_id));
! 1293: break;
! 1294: }
! 1295:
! 1296: /* This is where the real Options are saved */
! 1297: nbr->options = dd->options;
! 1298:
! 1299: #ifdef HAVE_OPAQUE_LSA
! 1300: if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE))
! 1301: {
! 1302: if (IS_DEBUG_OSPF_EVENT)
! 1303: zlog_debug ("Neighbor[%s] is %sOpaque-capable.",
! 1304: inet_ntoa (nbr->router_id),
! 1305: CHECK_FLAG (nbr->options, OSPF_OPTION_O) ? "" : "NOT ");
! 1306:
! 1307: if (! CHECK_FLAG (nbr->options, OSPF_OPTION_O)
! 1308: && IPV4_ADDR_SAME (&DR (oi), &nbr->address.u.prefix4))
! 1309: {
! 1310: zlog_warn ("DR-neighbor[%s] is NOT opaque-capable; "
! 1311: "Opaque-LSAs cannot be reliably advertised "
! 1312: "in this network.",
! 1313: inet_ntoa (nbr->router_id));
! 1314: /* This situation is undesirable, but not a real error. */
! 1315: }
! 1316: }
! 1317: #endif /* HAVE_OPAQUE_LSA */
! 1318:
! 1319: OSPF_NSM_EVENT_EXECUTE (nbr, NSM_NegotiationDone);
! 1320:
! 1321: /* continue processing rest of packet. */
! 1322: ospf_db_desc_proc (s, oi, nbr, dd, size);
! 1323: break;
! 1324: case NSM_Exchange:
! 1325: if (ospf_db_desc_is_dup (dd, nbr))
! 1326: {
! 1327: if (IS_SET_DD_MS (nbr->dd_flags))
! 1328: /* Master: discard duplicated DD packet. */
! 1329: zlog_info ("Packet[DD] (Master): Neighbor %s packet duplicated.",
! 1330: inet_ntoa (nbr->router_id));
! 1331: else
! 1332: /* Slave: cause to retransmit the last Database Description. */
! 1333: {
! 1334: zlog_info ("Packet[DD] [Slave]: Neighbor %s packet duplicated.",
! 1335: inet_ntoa (nbr->router_id));
! 1336: ospf_db_desc_resend (nbr);
! 1337: }
! 1338: break;
! 1339: }
! 1340:
! 1341: /* Otherwise DD packet should be checked. */
! 1342: /* Check Master/Slave bit mismatch */
! 1343: if (IS_SET_DD_MS (dd->flags) != IS_SET_DD_MS (nbr->last_recv.flags))
! 1344: {
! 1345: zlog_warn ("Packet[DD]: Neighbor %s MS-bit mismatch.",
! 1346: inet_ntoa(nbr->router_id));
! 1347: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch);
! 1348: if (IS_DEBUG_OSPF_EVENT)
! 1349: zlog_debug ("Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
! 1350: dd->flags, nbr->dd_flags);
! 1351: break;
! 1352: }
! 1353:
! 1354: /* Check initialize bit is set. */
! 1355: if (IS_SET_DD_I (dd->flags))
! 1356: {
! 1357: zlog_info ("Packet[DD]: Neighbor %s I-bit set.",
! 1358: inet_ntoa(nbr->router_id));
! 1359: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch);
! 1360: break;
! 1361: }
! 1362:
! 1363: /* Check DD Options. */
! 1364: if (dd->options != nbr->options)
! 1365: {
! 1366: #ifdef ORIGINAL_CODING
! 1367: /* Save the new options for debugging */
! 1368: nbr->options = dd->options;
! 1369: #endif /* ORIGINAL_CODING */
! 1370: zlog_warn ("Packet[DD]: Neighbor %s options mismatch.",
! 1371: inet_ntoa(nbr->router_id));
! 1372: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch);
! 1373: break;
! 1374: }
! 1375:
! 1376: /* Check DD sequence number. */
! 1377: if ((IS_SET_DD_MS (nbr->dd_flags) &&
! 1378: ntohl (dd->dd_seqnum) != nbr->dd_seqnum) ||
! 1379: (!IS_SET_DD_MS (nbr->dd_flags) &&
! 1380: ntohl (dd->dd_seqnum) != nbr->dd_seqnum + 1))
! 1381: {
! 1382: zlog_warn ("Packet[DD]: Neighbor %s sequence number mismatch.",
! 1383: inet_ntoa(nbr->router_id));
! 1384: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch);
! 1385: break;
! 1386: }
! 1387:
! 1388: /* Continue processing rest of packet. */
! 1389: ospf_db_desc_proc (s, oi, nbr, dd, size);
! 1390: break;
! 1391: case NSM_Loading:
! 1392: case NSM_Full:
! 1393: if (ospf_db_desc_is_dup (dd, nbr))
! 1394: {
! 1395: if (IS_SET_DD_MS (nbr->dd_flags))
! 1396: {
! 1397: /* Master should discard duplicate DD packet. */
! 1398: zlog_info ("Packet[DD]: Neighbor %s duplicated, "
! 1399: "packet discarded.",
! 1400: inet_ntoa(nbr->router_id));
! 1401: break;
! 1402: }
! 1403: else
! 1404: {
! 1405: struct timeval t, now;
! 1406: quagga_gettime (QUAGGA_CLK_MONOTONIC, &now);
! 1407: t = tv_sub (now, nbr->last_send_ts);
! 1408: if (tv_cmp (t, int2tv (nbr->v_inactivity)) < 0)
! 1409: {
! 1410: /* In states Loading and Full the slave must resend
! 1411: its last Database Description packet in response to
! 1412: duplicate Database Description packets received
! 1413: from the master. For this reason the slave must
! 1414: wait RouterDeadInterval seconds before freeing the
! 1415: last Database Description packet. Reception of a
! 1416: Database Description packet from the master after
! 1417: this interval will generate a SeqNumberMismatch
! 1418: neighbor event. RFC2328 Section 10.8 */
! 1419: ospf_db_desc_resend (nbr);
! 1420: break;
! 1421: }
! 1422: }
! 1423: }
! 1424:
! 1425: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch);
! 1426: break;
! 1427: default:
! 1428: zlog_warn ("Packet[DD]: Neighbor %s NSM illegal status %u.",
! 1429: inet_ntoa(nbr->router_id), nbr->state);
! 1430: break;
! 1431: }
! 1432: }
! 1433:
! 1434: #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
! 1435:
! 1436: /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
! 1437: static void
! 1438: ospf_ls_req (struct ip *iph, struct ospf_header *ospfh,
! 1439: struct stream *s, struct ospf_interface *oi, u_int16_t size)
! 1440: {
! 1441: struct ospf_neighbor *nbr;
! 1442: u_int32_t ls_type;
! 1443: struct in_addr ls_id;
! 1444: struct in_addr adv_router;
! 1445: struct ospf_lsa *find;
! 1446: struct list *ls_upd;
! 1447: unsigned int length;
! 1448:
! 1449: /* Increment statistics. */
! 1450: oi->ls_req_in++;
! 1451:
! 1452: nbr = ospf_nbr_lookup (oi, iph, ospfh);
! 1453: if (nbr == NULL)
! 1454: {
! 1455: zlog_warn ("Link State Request: Unknown Neighbor %s.",
! 1456: inet_ntoa (ospfh->router_id));
! 1457: return;
! 1458: }
! 1459:
! 1460: /* Add event to thread. */
! 1461: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived);
! 1462:
! 1463: /* Neighbor State should be Exchange or later. */
! 1464: if (nbr->state != NSM_Exchange &&
! 1465: nbr->state != NSM_Loading &&
! 1466: nbr->state != NSM_Full)
! 1467: {
! 1468: zlog_warn ("Link State Request received from %s: "
! 1469: "Neighbor state is %s, packet discarded.",
! 1470: inet_ntoa (ospfh->router_id),
! 1471: LOOKUP (ospf_nsm_state_msg, nbr->state));
! 1472: return;
! 1473: }
! 1474:
! 1475: /* Send Link State Update for ALL requested LSAs. */
! 1476: ls_upd = list_new ();
! 1477: length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE;
! 1478:
! 1479: while (size >= OSPF_LSA_KEY_SIZE)
! 1480: {
! 1481: /* Get one slice of Link State Request. */
! 1482: ls_type = stream_getl (s);
! 1483: ls_id.s_addr = stream_get_ipv4 (s);
! 1484: adv_router.s_addr = stream_get_ipv4 (s);
! 1485:
! 1486: /* Verify LSA type. */
! 1487: if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA)
! 1488: {
! 1489: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq);
! 1490: list_delete (ls_upd);
! 1491: return;
! 1492: }
! 1493:
! 1494: /* Search proper LSA in LSDB. */
! 1495: find = ospf_lsa_lookup (oi->area, ls_type, ls_id, adv_router);
! 1496: if (find == NULL)
! 1497: {
! 1498: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq);
! 1499: list_delete (ls_upd);
! 1500: return;
! 1501: }
! 1502:
! 1503: /* Packet overflows MTU size, send immediately. */
! 1504: if (length + ntohs (find->data->length) > ospf_packet_max (oi))
! 1505: {
! 1506: if (oi->type == OSPF_IFTYPE_NBMA)
! 1507: ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT);
! 1508: else
! 1509: ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT);
! 1510:
! 1511: /* Only remove list contents. Keep ls_upd. */
! 1512: list_delete_all_node (ls_upd);
! 1513:
! 1514: length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE;
! 1515: }
! 1516:
! 1517: /* Append LSA to update list. */
! 1518: listnode_add (ls_upd, find);
! 1519: length += ntohs (find->data->length);
! 1520:
! 1521: size -= OSPF_LSA_KEY_SIZE;
! 1522: }
! 1523:
! 1524: /* Send rest of Link State Update. */
! 1525: if (listcount (ls_upd) > 0)
! 1526: {
! 1527: if (oi->type == OSPF_IFTYPE_NBMA)
! 1528: ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT);
! 1529: else
! 1530: ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT);
! 1531:
! 1532: list_delete (ls_upd);
! 1533: }
! 1534: else
! 1535: list_free (ls_upd);
! 1536: }
! 1537:
! 1538: /* Get the list of LSAs from Link State Update packet.
! 1539: And process some validation -- RFC2328 Section 13. (1)-(2). */
! 1540: static struct list *
! 1541: ospf_ls_upd_list_lsa (struct ospf_neighbor *nbr, struct stream *s,
! 1542: struct ospf_interface *oi, size_t size)
! 1543: {
! 1544: u_int16_t count, sum;
! 1545: u_int32_t length;
! 1546: struct lsa_header *lsah;
! 1547: struct ospf_lsa *lsa;
! 1548: struct list *lsas;
! 1549:
! 1550: lsas = list_new ();
! 1551:
! 1552: count = stream_getl (s);
! 1553: size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */
! 1554:
! 1555: for (; size >= OSPF_LSA_HEADER_SIZE && count > 0;
! 1556: size -= length, stream_forward_getp (s, length), count--)
! 1557: {
! 1558: lsah = (struct lsa_header *) STREAM_PNT (s);
! 1559: length = ntohs (lsah->length);
! 1560:
! 1561: if (length > size)
! 1562: {
! 1563: zlog_warn ("Link State Update: LSA length exceeds packet size.");
! 1564: break;
! 1565: }
! 1566:
! 1567: /* Validate the LSA's LS checksum. */
! 1568: sum = lsah->checksum;
! 1569: if (sum != ospf_lsa_checksum (lsah))
! 1570: {
! 1571: zlog_warn ("Link State Update: LSA checksum error %x, %x.",
! 1572: sum, lsah->checksum);
! 1573: continue;
! 1574: }
! 1575:
! 1576: /* Examine the LSA's LS type. */
! 1577: if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA)
! 1578: {
! 1579: zlog_warn ("Link State Update: Unknown LS type %d", lsah->type);
! 1580: continue;
! 1581: }
! 1582:
! 1583: /*
! 1584: * What if the received LSA's age is greater than MaxAge?
! 1585: * Treat it as a MaxAge case -- endo.
! 1586: */
! 1587: if (ntohs (lsah->ls_age) > OSPF_LSA_MAXAGE)
! 1588: lsah->ls_age = htons (OSPF_LSA_MAXAGE);
! 1589:
! 1590: #ifdef HAVE_OPAQUE_LSA
! 1591: if (CHECK_FLAG (nbr->options, OSPF_OPTION_O))
! 1592: {
! 1593: #ifdef STRICT_OBIT_USAGE_CHECK
! 1594: if ((IS_OPAQUE_LSA(lsah->type) &&
! 1595: ! CHECK_FLAG (lsah->options, OSPF_OPTION_O))
! 1596: || (! IS_OPAQUE_LSA(lsah->type) &&
! 1597: CHECK_FLAG (lsah->options, OSPF_OPTION_O)))
! 1598: {
! 1599: /*
! 1600: * This neighbor must know the exact usage of O-bit;
! 1601: * the bit will be set in Type-9,10,11 LSAs only.
! 1602: */
! 1603: zlog_warn ("LSA[Type%d:%s]: O-bit abuse?", lsah->type, inet_ntoa (lsah->id));
! 1604: continue;
! 1605: }
! 1606: #endif /* STRICT_OBIT_USAGE_CHECK */
! 1607:
! 1608: /* Do not take in AS External Opaque-LSAs if we are a stub. */
! 1609: if (lsah->type == OSPF_OPAQUE_AS_LSA
! 1610: && nbr->oi->area->external_routing != OSPF_AREA_DEFAULT)
! 1611: {
! 1612: if (IS_DEBUG_OSPF_EVENT)
! 1613: zlog_debug ("LSA[Type%d:%s]: We are a stub, don't take this LSA.", lsah->type, inet_ntoa (lsah->id));
! 1614: continue;
! 1615: }
! 1616: }
! 1617: else if (IS_OPAQUE_LSA(lsah->type))
! 1618: {
! 1619: zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id));
! 1620: continue;
! 1621: }
! 1622: #endif /* HAVE_OPAQUE_LSA */
! 1623:
! 1624: /* Create OSPF LSA instance. */
! 1625: lsa = ospf_lsa_new ();
! 1626:
! 1627: /* We may wish to put some error checking if type NSSA comes in
! 1628: and area not in NSSA mode */
! 1629: switch (lsah->type)
! 1630: {
! 1631: case OSPF_AS_EXTERNAL_LSA:
! 1632: #ifdef HAVE_OPAQUE_LSA
! 1633: case OSPF_OPAQUE_AS_LSA:
! 1634: lsa->area = NULL;
! 1635: break;
! 1636: case OSPF_OPAQUE_LINK_LSA:
! 1637: lsa->oi = oi; /* Remember incoming interface for flooding control. */
! 1638: /* Fallthrough */
! 1639: #endif /* HAVE_OPAQUE_LSA */
! 1640: default:
! 1641: lsa->area = oi->area;
! 1642: break;
! 1643: }
! 1644:
! 1645: lsa->data = ospf_lsa_data_new (length);
! 1646: memcpy (lsa->data, lsah, length);
! 1647:
! 1648: if (IS_DEBUG_OSPF_EVENT)
! 1649: zlog_debug("LSA[Type%d:%s]: %p new LSA created with Link State Update",
! 1650: lsa->data->type, inet_ntoa (lsa->data->id), lsa);
! 1651: listnode_add (lsas, lsa);
! 1652: }
! 1653:
! 1654: return lsas;
! 1655: }
! 1656:
! 1657: /* Cleanup Update list. */
! 1658: static void
! 1659: ospf_upd_list_clean (struct list *lsas)
! 1660: {
! 1661: struct listnode *node, *nnode;
! 1662: struct ospf_lsa *lsa;
! 1663:
! 1664: for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa))
! 1665: ospf_lsa_discard (lsa);
! 1666:
! 1667: list_delete (lsas);
! 1668: }
! 1669:
! 1670: /* OSPF Link State Update message read -- RFC2328 Section 13. */
! 1671: static void
! 1672: ospf_ls_upd (struct ip *iph, struct ospf_header *ospfh,
! 1673: struct stream *s, struct ospf_interface *oi, u_int16_t size)
! 1674: {
! 1675: struct ospf_neighbor *nbr;
! 1676: struct list *lsas;
! 1677: struct listnode *node, *nnode;
! 1678: struct ospf_lsa *lsa = NULL;
! 1679: /* unsigned long ls_req_found = 0; */
! 1680:
! 1681: /* Dis-assemble the stream, update each entry, re-encapsulate for flooding */
! 1682:
! 1683: /* Increment statistics. */
! 1684: oi->ls_upd_in++;
! 1685:
! 1686: /* Check neighbor. */
! 1687: nbr = ospf_nbr_lookup (oi, iph, ospfh);
! 1688: if (nbr == NULL)
! 1689: {
! 1690: zlog_warn ("Link State Update: Unknown Neighbor %s on int: %s",
! 1691: inet_ntoa (ospfh->router_id), IF_NAME (oi));
! 1692: return;
! 1693: }
! 1694:
! 1695: /* Add event to thread. */
! 1696: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived);
! 1697:
! 1698: /* Check neighbor state. */
! 1699: if (nbr->state < NSM_Exchange)
! 1700: {
! 1701: zlog_warn ("Link State Update: "
! 1702: "Neighbor[%s] state %s is less than Exchange",
! 1703: inet_ntoa (ospfh->router_id),
! 1704: LOOKUP(ospf_nsm_state_msg, nbr->state));
! 1705: return;
! 1706: }
! 1707:
! 1708: /* Get list of LSAs from Link State Update packet. - Also perorms Stages
! 1709: * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
! 1710: * of section 13.
! 1711: */
! 1712: lsas = ospf_ls_upd_list_lsa (nbr, s, oi, size);
! 1713:
! 1714: #ifdef HAVE_OPAQUE_LSA
! 1715: /*
! 1716: * If self-originated Opaque-LSAs that have flooded before restart
! 1717: * are contained in the received LSUpd message, corresponding LSReq
! 1718: * messages to be sent may have to be modified.
! 1719: * To eliminate possible race conditions such that flushing and normal
! 1720: * updating for the same LSA would take place alternately, this trick
! 1721: * must be done before entering to the loop below.
! 1722: */
! 1723: /* XXX: Why is this Opaque specific? Either our core code is deficient
! 1724: * and this should be fixed generally, or Opaque is inventing strawman
! 1725: * problems */
! 1726: ospf_opaque_adjust_lsreq (nbr, lsas);
! 1727: #endif /* HAVE_OPAQUE_LSA */
! 1728:
! 1729: #define DISCARD_LSA(L,N) {\
! 1730: if (IS_DEBUG_OSPF_EVENT) \
! 1731: zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p Type-%d", N, lsa, (int) lsa->data->type); \
! 1732: ospf_lsa_discard (L); \
! 1733: continue; }
! 1734:
! 1735: /* Process each LSA received in the one packet. */
! 1736: for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa))
! 1737: {
! 1738: struct ospf_lsa *ls_ret, *current;
! 1739: int ret = 1;
! 1740:
! 1741: if (IS_DEBUG_OSPF_NSSA)
! 1742: {
! 1743: char buf1[INET_ADDRSTRLEN];
! 1744: char buf2[INET_ADDRSTRLEN];
! 1745: char buf3[INET_ADDRSTRLEN];
! 1746:
! 1747: zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s",
! 1748: lsa->data->type,
! 1749: inet_ntop (AF_INET, &ospfh->router_id,
! 1750: buf1, INET_ADDRSTRLEN),
! 1751: inet_ntop (AF_INET, &lsa->data->id,
! 1752: buf2, INET_ADDRSTRLEN),
! 1753: inet_ntop (AF_INET, &lsa->data->adv_router,
! 1754: buf3, INET_ADDRSTRLEN));
! 1755: }
! 1756:
! 1757: listnode_delete (lsas, lsa); /* We don't need it in list anymore */
! 1758:
! 1759: /* Validate Checksum - Done above by ospf_ls_upd_list_lsa() */
! 1760:
! 1761: /* LSA Type - Done above by ospf_ls_upd_list_lsa() */
! 1762:
! 1763: /* Do not take in AS External LSAs if we are a stub or NSSA. */
! 1764:
! 1765: /* Do not take in AS NSSA if this neighbor and we are not NSSA */
! 1766:
! 1767: /* Do take in Type-7's if we are an NSSA */
! 1768:
! 1769: /* If we are also an ABR, later translate them to a Type-5 packet */
! 1770:
! 1771: /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
! 1772: translate them to a separate Type-5 packet. */
! 1773:
! 1774: if (lsa->data->type == OSPF_AS_EXTERNAL_LSA)
! 1775: /* Reject from STUB or NSSA */
! 1776: if (nbr->oi->area->external_routing != OSPF_AREA_DEFAULT)
! 1777: {
! 1778: if (IS_DEBUG_OSPF_NSSA)
! 1779: zlog_debug("Incoming External LSA Discarded: We are NSSA/STUB Area");
! 1780: DISCARD_LSA (lsa, 1);
! 1781: }
! 1782:
! 1783: if (lsa->data->type == OSPF_AS_NSSA_LSA)
! 1784: if (nbr->oi->area->external_routing != OSPF_AREA_NSSA)
! 1785: {
! 1786: if (IS_DEBUG_OSPF_NSSA)
! 1787: zlog_debug("Incoming NSSA LSA Discarded: Not NSSA Area");
! 1788: DISCARD_LSA (lsa,2);
! 1789: }
! 1790:
! 1791: /* Find the LSA in the current database. */
! 1792:
! 1793: current = ospf_lsa_lookup_by_header (oi->area, lsa->data);
! 1794:
! 1795: /* If the LSA's LS age is equal to MaxAge, and there is currently
! 1796: no instance of the LSA in the router's link state database,
! 1797: and none of router's neighbors are in states Exchange or Loading,
! 1798: then take the following actions. */
! 1799:
! 1800: if (IS_LSA_MAXAGE (lsa) && !current &&
! 1801: (ospf_nbr_count (oi, NSM_Exchange) +
! 1802: ospf_nbr_count (oi, NSM_Loading)) == 0)
! 1803: {
! 1804: /* Response Link State Acknowledgment. */
! 1805: ospf_ls_ack_send (nbr, lsa);
! 1806:
! 1807: /* Discard LSA. */
! 1808: zlog_info ("Link State Update[%s]: LS age is equal to MaxAge.",
! 1809: dump_lsa_key(lsa));
! 1810: DISCARD_LSA (lsa, 3);
! 1811: }
! 1812:
! 1813: #ifdef HAVE_OPAQUE_LSA
! 1814: if (IS_OPAQUE_LSA (lsa->data->type)
! 1815: && IPV4_ADDR_SAME (&lsa->data->adv_router, &oi->ospf->router_id))
! 1816: {
! 1817: /*
! 1818: * Even if initial flushing seems to be completed, there might
! 1819: * be a case that self-originated LSA with MaxAge still remain
! 1820: * in the routing domain.
! 1821: * Just send an LSAck message to cease retransmission.
! 1822: */
! 1823: if (IS_LSA_MAXAGE (lsa))
! 1824: {
! 1825: zlog_warn ("LSA[%s]: Boomerang effect?", dump_lsa_key (lsa));
! 1826: ospf_ls_ack_send (nbr, lsa);
! 1827: ospf_lsa_discard (lsa);
! 1828:
! 1829: if (current != NULL && ! IS_LSA_MAXAGE (current))
! 1830: ospf_opaque_lsa_refresh_schedule (current);
! 1831: continue;
! 1832: }
! 1833:
! 1834: /*
! 1835: * If an instance of self-originated Opaque-LSA is not found
! 1836: * in the LSDB, there are some possible cases here.
! 1837: *
! 1838: * 1) This node lost opaque-capability after restart.
! 1839: * 2) Else, a part of opaque-type is no more supported.
! 1840: * 3) Else, a part of opaque-id is no more supported.
! 1841: *
! 1842: * Anyway, it is still this node's responsibility to flush it.
! 1843: * Otherwise, the LSA instance remains in the routing domain
! 1844: * until its age reaches to MaxAge.
! 1845: */
! 1846: /* XXX: We should deal with this for *ALL* LSAs, not just opaque */
! 1847: if (current == NULL)
! 1848: {
! 1849: if (IS_DEBUG_OSPF_EVENT)
! 1850: zlog_debug ("LSA[%s]: Previously originated Opaque-LSA,"
! 1851: "not found in the LSDB.", dump_lsa_key (lsa));
! 1852:
! 1853: SET_FLAG (lsa->flags, OSPF_LSA_SELF);
! 1854:
! 1855: ospf_opaque_self_originated_lsa_received (nbr, lsa);
! 1856: ospf_ls_ack_send (nbr, lsa);
! 1857:
! 1858: continue;
! 1859: }
! 1860: }
! 1861: #endif /* HAVE_OPAQUE_LSA */
! 1862:
! 1863: /* It might be happen that received LSA is self-originated network LSA, but
! 1864: * router ID is cahnged. So, we should check if LSA is a network-LSA whose
! 1865: * Link State ID is one of the router's own IP interface addresses but whose
! 1866: * Advertising Router is not equal to the router's own Router ID
! 1867: * According to RFC 2328 12.4.2 and 13.4 this LSA should be flushed.
! 1868: */
! 1869:
! 1870: if(lsa->data->type == OSPF_NETWORK_LSA)
! 1871: {
! 1872: struct listnode *oinode, *oinnode;
! 1873: struct ospf_interface *out_if;
! 1874: int Flag = 0;
! 1875:
! 1876: for (ALL_LIST_ELEMENTS (oi->ospf->oiflist, oinode, oinnode, out_if))
! 1877: {
! 1878: if(out_if == NULL)
! 1879: break;
! 1880:
! 1881: if((IPV4_ADDR_SAME(&out_if->address->u.prefix4, &lsa->data->id)) &&
! 1882: (!(IPV4_ADDR_SAME(&oi->ospf->router_id, &lsa->data->adv_router))))
! 1883: {
! 1884: if(out_if->network_lsa_self)
! 1885: {
! 1886: ospf_lsa_flush_area(lsa,out_if->area);
! 1887: if(IS_DEBUG_OSPF_EVENT)
! 1888: zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
! 1889: lsa, (int) lsa->data->type);
! 1890: ospf_lsa_discard (lsa);
! 1891: Flag = 1;
! 1892: }
! 1893: break;
! 1894: }
! 1895: }
! 1896: if(Flag)
! 1897: continue;
! 1898: }
! 1899:
! 1900: /* (5) Find the instance of this LSA that is currently contained
! 1901: in the router's link state database. If there is no
! 1902: database copy, or the received LSA is more recent than
! 1903: the database copy the following steps must be performed. */
! 1904:
! 1905: if (current == NULL ||
! 1906: (ret = ospf_lsa_more_recent (current, lsa)) < 0)
! 1907: {
! 1908: /* Actual flooding procedure. */
! 1909: if (ospf_flood (oi->ospf, nbr, current, lsa) < 0) /* Trap NSSA later. */
! 1910: DISCARD_LSA (lsa, 4);
! 1911: continue;
! 1912: }
! 1913:
! 1914: /* (6) Else, If there is an instance of the LSA on the sending
! 1915: neighbor's Link state request list, an error has occurred in
! 1916: the Database Exchange process. In this case, restart the
! 1917: Database Exchange process by generating the neighbor event
! 1918: BadLSReq for the sending neighbor and stop processing the
! 1919: Link State Update packet. */
! 1920:
! 1921: if (ospf_ls_request_lookup (nbr, lsa))
! 1922: {
! 1923: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq);
! 1924: zlog_warn("LSA[%s] instance exists on Link state request list",
! 1925: dump_lsa_key(lsa));
! 1926:
! 1927: /* Clean list of LSAs. */
! 1928: ospf_upd_list_clean (lsas);
! 1929: /* this lsa is not on lsas list already. */
! 1930: ospf_lsa_discard (lsa);
! 1931: return;
! 1932: }
! 1933:
! 1934: /* If the received LSA is the same instance as the database copy
! 1935: (i.e., neither one is more recent) the following two steps
! 1936: should be performed: */
! 1937:
! 1938: if (ret == 0)
! 1939: {
! 1940: /* If the LSA is listed in the Link state retransmission list
! 1941: for the receiving adjacency, the router itself is expecting
! 1942: an acknowledgment for this LSA. The router should treat the
! 1943: received LSA as an acknowledgment by removing the LSA from
! 1944: the Link state retransmission list. This is termed an
! 1945: "implied acknowledgment". */
! 1946:
! 1947: ls_ret = ospf_ls_retransmit_lookup (nbr, lsa);
! 1948:
! 1949: if (ls_ret != NULL)
! 1950: {
! 1951: ospf_ls_retransmit_delete (nbr, ls_ret);
! 1952:
! 1953: /* Delayed acknowledgment sent if advertisement received
! 1954: from Designated Router, otherwise do nothing. */
! 1955: if (oi->state == ISM_Backup)
! 1956: if (NBR_IS_DR (nbr))
! 1957: listnode_add (oi->ls_ack, ospf_lsa_lock (lsa));
! 1958:
! 1959: DISCARD_LSA (lsa, 5);
! 1960: }
! 1961: else
! 1962: /* Acknowledge the receipt of the LSA by sending a
! 1963: Link State Acknowledgment packet back out the receiving
! 1964: interface. */
! 1965: {
! 1966: ospf_ls_ack_send (nbr, lsa);
! 1967: DISCARD_LSA (lsa, 6);
! 1968: }
! 1969: }
! 1970:
! 1971: /* The database copy is more recent. If the database copy
! 1972: has LS age equal to MaxAge and LS sequence number equal to
! 1973: MaxSequenceNumber, simply discard the received LSA without
! 1974: acknowledging it. (In this case, the LSA's LS sequence number is
! 1975: wrapping, and the MaxSequenceNumber LSA must be completely
! 1976: flushed before any new LSA instance can be introduced). */
! 1977:
! 1978: else if (ret > 0) /* Database copy is more recent */
! 1979: {
! 1980: if (IS_LSA_MAXAGE (current) &&
! 1981: current->data->ls_seqnum == htonl (OSPF_MAX_SEQUENCE_NUMBER))
! 1982: {
! 1983: DISCARD_LSA (lsa, 7);
! 1984: }
! 1985: /* Otherwise, as long as the database copy has not been sent in a
! 1986: Link State Update within the last MinLSArrival seconds, send the
! 1987: database copy back to the sending neighbor, encapsulated within
! 1988: a Link State Update Packet. The Link State Update Packet should
! 1989: be sent directly to the neighbor. In so doing, do not put the
! 1990: database copy of the LSA on the neighbor's link state
! 1991: retransmission list, and do not acknowledge the received (less
! 1992: recent) LSA instance. */
! 1993: else
! 1994: {
! 1995: struct timeval now;
! 1996:
! 1997: quagga_gettime (QUAGGA_CLK_MONOTONIC, &now);
! 1998:
! 1999: if (tv_cmp (tv_sub (now, current->tv_orig),
! 2000: int2tv (OSPF_MIN_LS_ARRIVAL)) >= 0)
! 2001: /* Trap NSSA type later.*/
! 2002: ospf_ls_upd_send_lsa (nbr, current, OSPF_SEND_PACKET_DIRECT);
! 2003: DISCARD_LSA (lsa, 8);
! 2004: }
! 2005: }
! 2006: }
! 2007: #undef DISCARD_LSA
! 2008:
! 2009: assert (listcount (lsas) == 0);
! 2010: list_delete (lsas);
! 2011: }
! 2012:
! 2013: /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
! 2014: static void
! 2015: ospf_ls_ack (struct ip *iph, struct ospf_header *ospfh,
! 2016: struct stream *s, struct ospf_interface *oi, u_int16_t size)
! 2017: {
! 2018: struct ospf_neighbor *nbr;
! 2019:
! 2020: /* increment statistics. */
! 2021: oi->ls_ack_in++;
! 2022:
! 2023: nbr = ospf_nbr_lookup (oi, iph, ospfh);
! 2024: if (nbr == NULL)
! 2025: {
! 2026: zlog_warn ("Link State Acknowledgment: Unknown Neighbor %s.",
! 2027: inet_ntoa (ospfh->router_id));
! 2028: return;
! 2029: }
! 2030:
! 2031: /* Add event to thread. */
! 2032: OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_PacketReceived);
! 2033:
! 2034: if (nbr->state < NSM_Exchange)
! 2035: {
! 2036: zlog_warn ("Link State Acknowledgment: "
! 2037: "Neighbor[%s] state %s is less than Exchange",
! 2038: inet_ntoa (ospfh->router_id),
! 2039: LOOKUP(ospf_nsm_state_msg, nbr->state));
! 2040: return;
! 2041: }
! 2042:
! 2043: while (size >= OSPF_LSA_HEADER_SIZE)
! 2044: {
! 2045: struct ospf_lsa *lsa, *lsr;
! 2046:
! 2047: lsa = ospf_lsa_new ();
! 2048: lsa->data = (struct lsa_header *) STREAM_PNT (s);
! 2049:
! 2050: /* lsah = (struct lsa_header *) STREAM_PNT (s); */
! 2051: size -= OSPF_LSA_HEADER_SIZE;
! 2052: stream_forward_getp (s, OSPF_LSA_HEADER_SIZE);
! 2053:
! 2054: if (lsa->data->type < OSPF_MIN_LSA || lsa->data->type >= OSPF_MAX_LSA)
! 2055: {
! 2056: lsa->data = NULL;
! 2057: ospf_lsa_discard (lsa);
! 2058: continue;
! 2059: }
! 2060:
! 2061: lsr = ospf_ls_retransmit_lookup (nbr, lsa);
! 2062:
! 2063: if (lsr != NULL && lsr->data->ls_seqnum == lsa->data->ls_seqnum)
! 2064: {
! 2065: #ifdef HAVE_OPAQUE_LSA
! 2066: if (IS_OPAQUE_LSA (lsr->data->type))
! 2067: ospf_opaque_ls_ack_received (nbr, lsr);
! 2068: #endif /* HAVE_OPAQUE_LSA */
! 2069:
! 2070: ospf_ls_retransmit_delete (nbr, lsr);
! 2071: }
! 2072:
! 2073: lsa->data = NULL;
! 2074: ospf_lsa_discard (lsa);
! 2075: }
! 2076:
! 2077: return;
! 2078: }
! 2079:
! 2080: static struct stream *
! 2081: ospf_recv_packet (int fd, struct interface **ifp, struct stream *ibuf)
! 2082: {
! 2083: int ret;
! 2084: struct ip *iph;
! 2085: u_int16_t ip_len;
! 2086: unsigned int ifindex = 0;
! 2087: struct iovec iov;
! 2088: /* Header and data both require alignment. */
! 2089: char buff [CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
! 2090: struct msghdr msgh;
! 2091:
! 2092: memset (&msgh, 0, sizeof (struct msghdr));
! 2093: msgh.msg_iov = &iov;
! 2094: msgh.msg_iovlen = 1;
! 2095: msgh.msg_control = (caddr_t) buff;
! 2096: msgh.msg_controllen = sizeof (buff);
! 2097:
! 2098: ret = stream_recvmsg (ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE+1);
! 2099: if (ret < 0)
! 2100: {
! 2101: zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno));
! 2102: return NULL;
! 2103: }
! 2104: if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */
! 2105: {
! 2106: zlog_warn("ospf_recv_packet: discarding runt packet of length %d "
! 2107: "(ip header size is %u)",
! 2108: ret, (u_int)sizeof(iph));
! 2109: return NULL;
! 2110: }
! 2111:
! 2112: /* Note that there should not be alignment problems with this assignment
! 2113: because this is at the beginning of the stream data buffer. */
! 2114: iph = (struct ip *) STREAM_DATA(ibuf);
! 2115: sockopt_iphdrincl_swab_systoh (iph);
! 2116:
! 2117: ip_len = iph->ip_len;
! 2118:
! 2119: #if !defined(GNU_LINUX) && (OpenBSD < 200311)
! 2120: /*
! 2121: * Kernel network code touches incoming IP header parameters,
! 2122: * before protocol specific processing.
! 2123: *
! 2124: * 1) Convert byteorder to host representation.
! 2125: * --> ip_len, ip_id, ip_off
! 2126: *
! 2127: * 2) Adjust ip_len to strip IP header size!
! 2128: * --> If user process receives entire IP packet via RAW
! 2129: * socket, it must consider adding IP header size to
! 2130: * the "ip_len" field of "ip" structure.
! 2131: *
! 2132: * For more details, see <netinet/ip_input.c>.
! 2133: */
! 2134: ip_len = ip_len + (iph->ip_hl << 2);
! 2135: #endif
! 2136:
! 2137: #if defined(__DragonFly__)
! 2138: /*
! 2139: * in DragonFly's raw socket, ip_len/ip_off are read
! 2140: * in network byte order.
! 2141: * As OpenBSD < 200311 adjust ip_len to strip IP header size!
! 2142: */
! 2143: ip_len = ntohs(iph->ip_len) + (iph->ip_hl << 2);
! 2144: #endif
! 2145:
! 2146: ifindex = getsockopt_ifindex (AF_INET, &msgh);
! 2147:
! 2148: *ifp = if_lookup_by_index (ifindex);
! 2149:
! 2150: if (ret != ip_len)
! 2151: {
! 2152: zlog_warn ("ospf_recv_packet read length mismatch: ip_len is %d, "
! 2153: "but recvmsg returned %d", ip_len, ret);
! 2154: return NULL;
! 2155: }
! 2156:
! 2157: return ibuf;
! 2158: }
! 2159:
! 2160: static struct ospf_interface *
! 2161: ospf_associate_packet_vl (struct ospf *ospf, struct interface *ifp,
! 2162: struct ip *iph, struct ospf_header *ospfh)
! 2163: {
! 2164: struct ospf_interface *rcv_oi;
! 2165: struct ospf_vl_data *vl_data;
! 2166: struct ospf_area *vl_area;
! 2167: struct listnode *node;
! 2168:
! 2169: if (IN_MULTICAST (ntohl (iph->ip_dst.s_addr)) ||
! 2170: !OSPF_IS_AREA_BACKBONE (ospfh))
! 2171: return NULL;
! 2172:
! 2173: /* look for local OSPF interface matching the destination
! 2174: * to determine Area ID. We presume therefore the destination address
! 2175: * is unique, or at least (for "unnumbered" links), not used in other
! 2176: * areas
! 2177: */
! 2178: if ((rcv_oi = ospf_if_lookup_by_local_addr (ospf, NULL,
! 2179: iph->ip_dst)) == NULL)
! 2180: return NULL;
! 2181:
! 2182: for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data))
! 2183: {
! 2184: vl_area = ospf_area_lookup_by_area_id (ospf, vl_data->vl_area_id);
! 2185: if (!vl_area)
! 2186: continue;
! 2187:
! 2188: if (OSPF_AREA_SAME (&vl_area, &rcv_oi->area) &&
! 2189: IPV4_ADDR_SAME (&vl_data->vl_peer, &ospfh->router_id))
! 2190: {
! 2191: if (IS_DEBUG_OSPF_EVENT)
! 2192: zlog_debug ("associating packet with %s",
! 2193: IF_NAME (vl_data->vl_oi));
! 2194: if (! CHECK_FLAG (vl_data->vl_oi->ifp->flags, IFF_UP))
! 2195: {
! 2196: if (IS_DEBUG_OSPF_EVENT)
! 2197: zlog_debug ("This VL is not up yet, sorry");
! 2198: return NULL;
! 2199: }
! 2200:
! 2201: return vl_data->vl_oi;
! 2202: }
! 2203: }
! 2204:
! 2205: if (IS_DEBUG_OSPF_EVENT)
! 2206: zlog_debug ("couldn't find any VL to associate the packet with");
! 2207:
! 2208: return NULL;
! 2209: }
! 2210:
! 2211: static inline int
! 2212: ospf_check_area_id (struct ospf_interface *oi, struct ospf_header *ospfh)
! 2213: {
! 2214: /* Check match the Area ID of the receiving interface. */
! 2215: if (OSPF_AREA_SAME (&oi->area, &ospfh))
! 2216: return 1;
! 2217:
! 2218: return 0;
! 2219: }
! 2220:
! 2221: /* Unbound socket will accept any Raw IP packets if proto is matched.
! 2222: To prevent it, compare src IP address and i/f address with masking
! 2223: i/f network mask. */
! 2224: static int
! 2225: ospf_check_network_mask (struct ospf_interface *oi, struct in_addr ip_src)
! 2226: {
! 2227: struct in_addr mask, me, him;
! 2228:
! 2229: if (oi->type == OSPF_IFTYPE_POINTOPOINT ||
! 2230: oi->type == OSPF_IFTYPE_VIRTUALLINK)
! 2231: return 1;
! 2232:
! 2233: masklen2ip (oi->address->prefixlen, &mask);
! 2234:
! 2235: me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr;
! 2236: him.s_addr = ip_src.s_addr & mask.s_addr;
! 2237:
! 2238: if (IPV4_ADDR_SAME (&me, &him))
! 2239: return 1;
! 2240:
! 2241: return 0;
! 2242: }
! 2243:
! 2244: static int
! 2245: ospf_check_auth (struct ospf_interface *oi, struct stream *ibuf,
! 2246: struct ospf_header *ospfh)
! 2247: {
! 2248: int ret = 0;
! 2249: struct crypt_key *ck;
! 2250:
! 2251: switch (ntohs (ospfh->auth_type))
! 2252: {
! 2253: case OSPF_AUTH_NULL:
! 2254: ret = 1;
! 2255: break;
! 2256: case OSPF_AUTH_SIMPLE:
! 2257: if (!memcmp (OSPF_IF_PARAM (oi, auth_simple), ospfh->u.auth_data, OSPF_AUTH_SIMPLE_SIZE))
! 2258: ret = 1;
! 2259: else
! 2260: ret = 0;
! 2261: break;
! 2262: case OSPF_AUTH_CRYPTOGRAPHIC:
! 2263: if ((ck = listgetdata (listtail(OSPF_IF_PARAM (oi,auth_crypt)))) == NULL)
! 2264: {
! 2265: ret = 0;
! 2266: break;
! 2267: }
! 2268:
! 2269: /* This is very basic, the digest processing is elsewhere */
! 2270: if (ospfh->u.crypt.auth_data_len == OSPF_AUTH_MD5_SIZE &&
! 2271: ospfh->u.crypt.key_id == ck->key_id &&
! 2272: ntohs (ospfh->length) + OSPF_AUTH_SIMPLE_SIZE <= stream_get_size (ibuf))
! 2273: ret = 1;
! 2274: else
! 2275: ret = 0;
! 2276: break;
! 2277: default:
! 2278: ret = 0;
! 2279: break;
! 2280: }
! 2281:
! 2282: return ret;
! 2283: }
! 2284:
! 2285: static int
! 2286: ospf_check_sum (struct ospf_header *ospfh)
! 2287: {
! 2288: u_int32_t ret;
! 2289: u_int16_t sum;
! 2290:
! 2291: /* clear auth_data for checksum. */
! 2292: memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE);
! 2293:
! 2294: /* keep checksum and clear. */
! 2295: sum = ospfh->checksum;
! 2296: memset (&ospfh->checksum, 0, sizeof (u_int16_t));
! 2297:
! 2298: /* calculate checksum. */
! 2299: ret = in_cksum (ospfh, ntohs (ospfh->length));
! 2300:
! 2301: if (ret != sum)
! 2302: {
! 2303: zlog_info ("ospf_check_sum(): checksum mismatch, my %X, his %X",
! 2304: ret, sum);
! 2305: return 0;
! 2306: }
! 2307:
! 2308: return 1;
! 2309: }
! 2310:
! 2311: /* OSPF Header verification. */
! 2312: static int
! 2313: ospf_verify_header (struct stream *ibuf, struct ospf_interface *oi,
! 2314: struct ip *iph, struct ospf_header *ospfh)
! 2315: {
! 2316: /* check version. */
! 2317: if (ospfh->version != OSPF_VERSION)
! 2318: {
! 2319: zlog_warn ("interface %s: ospf_read version number mismatch.",
! 2320: IF_NAME (oi));
! 2321: return -1;
! 2322: }
! 2323:
! 2324: /* Valid OSPFv2 packet types are 1 through 5 inclusive. */
! 2325: if (ospfh->type < 1 || ospfh->type > 5)
! 2326: {
! 2327: zlog_warn ("interface %s: invalid packet type %u", IF_NAME (oi), ospfh->type);
! 2328: return -1;
! 2329: }
! 2330:
! 2331: /* Check Area ID. */
! 2332: if (!ospf_check_area_id (oi, ospfh))
! 2333: {
! 2334: zlog_warn ("interface %s: ospf_read invalid Area ID %s.",
! 2335: IF_NAME (oi), inet_ntoa (ospfh->area_id));
! 2336: return -1;
! 2337: }
! 2338:
! 2339: /* Check network mask, Silently discarded. */
! 2340: if (! ospf_check_network_mask (oi, iph->ip_src))
! 2341: {
! 2342: zlog_warn ("interface %s: ospf_read network address is not same [%s]",
! 2343: IF_NAME (oi), inet_ntoa (iph->ip_src));
! 2344: return -1;
! 2345: }
! 2346:
! 2347: /* Check authentication. */
! 2348: if (ospf_auth_type (oi) != ntohs (ospfh->auth_type))
! 2349: {
! 2350: zlog_warn ("interface %s: auth-type mismatch, local %d, rcvd %d",
! 2351: IF_NAME (oi), ospf_auth_type (oi), ntohs (ospfh->auth_type));
! 2352: return -1;
! 2353: }
! 2354:
! 2355: if (! ospf_check_auth (oi, ibuf, ospfh))
! 2356: {
! 2357: zlog_warn ("interface %s: ospf_read authentication failed.",
! 2358: IF_NAME (oi));
! 2359: return -1;
! 2360: }
! 2361:
! 2362: /* if check sum is invalid, packet is discarded. */
! 2363: if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC)
! 2364: {
! 2365: if (! ospf_check_sum (ospfh))
! 2366: {
! 2367: zlog_warn ("interface %s: ospf_read packet checksum error %s",
! 2368: IF_NAME (oi), inet_ntoa (ospfh->router_id));
! 2369: return -1;
! 2370: }
! 2371: }
! 2372: else
! 2373: {
! 2374: if (ospfh->checksum != 0)
! 2375: return -1;
! 2376: if (ospf_check_md5_digest (oi, ibuf, ntohs (ospfh->length)) == 0)
! 2377: {
! 2378: zlog_warn ("interface %s: ospf_read md5 authentication failed.",
! 2379: IF_NAME (oi));
! 2380: return -1;
! 2381: }
! 2382: }
! 2383:
! 2384: return 0;
! 2385: }
! 2386:
! 2387: /* Starting point of packet process function. */
! 2388: int
! 2389: ospf_read (struct thread *thread)
! 2390: {
! 2391: int ret;
! 2392: struct stream *ibuf;
! 2393: struct ospf *ospf;
! 2394: struct ospf_interface *oi;
! 2395: struct ip *iph;
! 2396: struct ospf_header *ospfh;
! 2397: u_int16_t length;
! 2398: struct interface *ifp;
! 2399:
! 2400: /* first of all get interface pointer. */
! 2401: ospf = THREAD_ARG (thread);
! 2402:
! 2403: /* prepare for next packet. */
! 2404: ospf->t_read = thread_add_read (master, ospf_read, ospf, ospf->fd);
! 2405:
! 2406: /* read OSPF packet. */
! 2407: stream_reset(ospf->ibuf);
! 2408: if (!(ibuf = ospf_recv_packet (ospf->fd, &ifp, ospf->ibuf)))
! 2409: return -1;
! 2410:
! 2411: /* Note that there should not be alignment problems with this assignment
! 2412: because this is at the beginning of the stream data buffer. */
! 2413: iph = (struct ip *) STREAM_DATA (ibuf);
! 2414: /* Note that sockopt_iphdrincl_swab_systoh was called in ospf_recv_packet. */
! 2415:
! 2416: if (ifp == NULL)
! 2417: /* Handle cases where the platform does not support retrieving the ifindex,
! 2418: and also platforms (such as Solaris 8) that claim to support ifindex
! 2419: retrieval but do not. */
! 2420: ifp = if_lookup_address (iph->ip_src);
! 2421:
! 2422: if (ifp == NULL)
! 2423: return 0;
! 2424:
! 2425: /* IP Header dump. */
! 2426: if (IS_DEBUG_OSPF_PACKET(0, RECV))
! 2427: ospf_ip_header_dump (iph);
! 2428:
! 2429: /* Self-originated packet should be discarded silently. */
! 2430: if (ospf_if_lookup_by_local_addr (ospf, NULL, iph->ip_src))
! 2431: {
! 2432: if (IS_DEBUG_OSPF_PACKET (0, RECV))
! 2433: {
! 2434: zlog_debug ("ospf_read[%s]: Dropping self-originated packet",
! 2435: inet_ntoa (iph->ip_src));
! 2436: }
! 2437: return 0;
! 2438: }
! 2439:
! 2440: /* Advance from IP header to OSPF header (iph->ip_hl has been verified
! 2441: by ospf_recv_packet() to be correct). */
! 2442: stream_forward_getp (ibuf, iph->ip_hl * 4);
! 2443:
! 2444: /* Make sure the OSPF header is really there. */
! 2445: if (stream_get_endp (ibuf) - stream_get_getp (ibuf) < OSPF_HEADER_SIZE)
! 2446: {
! 2447: zlog_debug ("ospf_read: ignored OSPF packet with undersized (%u bytes) header",
! 2448: stream_get_endp (ibuf) - stream_get_getp (ibuf));
! 2449: return -1;
! 2450: }
! 2451:
! 2452: /* Now it is safe to access all fields of OSPF packet header. */
! 2453: ospfh = (struct ospf_header *) STREAM_PNT (ibuf);
! 2454:
! 2455: /* associate packet with ospf interface */
! 2456: oi = ospf_if_lookup_recv_if (ospf, iph->ip_src, ifp);
! 2457:
! 2458: /* ospf_verify_header() relies on a valid "oi" and thus can be called only
! 2459: after the passive/backbone/other checks below are passed. These checks
! 2460: in turn access the fields of unverified "ospfh" structure for their own
! 2461: purposes and must remain very accurate in doing this. */
! 2462:
! 2463: /* If incoming interface is passive one, ignore it. */
! 2464: if (oi && OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE)
! 2465: {
! 2466: char buf[3][INET_ADDRSTRLEN];
! 2467:
! 2468: if (IS_DEBUG_OSPF_EVENT)
! 2469: zlog_debug ("ignoring packet from router %s sent to %s, "
! 2470: "received on a passive interface, %s",
! 2471: inet_ntop(AF_INET, &ospfh->router_id, buf[0], sizeof(buf[0])),
! 2472: inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])),
! 2473: inet_ntop(AF_INET, &oi->address->u.prefix4,
! 2474: buf[2], sizeof(buf[2])));
! 2475:
! 2476: if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS))
! 2477: {
! 2478: /* Try to fix multicast membership.
! 2479: * Some OS:es may have problems in this area,
! 2480: * make sure it is removed.
! 2481: */
! 2482: OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS);
! 2483: ospf_if_set_multicast(oi);
! 2484: }
! 2485: return 0;
! 2486: }
! 2487:
! 2488:
! 2489: /* if no local ospf_interface,
! 2490: * or header area is backbone but ospf_interface is not
! 2491: * check for VLINK interface
! 2492: */
! 2493: if ( (oi == NULL) ||
! 2494: (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id)
! 2495: && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id))
! 2496: )
! 2497: {
! 2498: if ((oi = ospf_associate_packet_vl (ospf, ifp, iph, ospfh)) == NULL)
! 2499: {
! 2500: if (IS_DEBUG_OSPF_EVENT)
! 2501: zlog_debug ("Packet from [%s] received on link %s"
! 2502: " but no ospf_interface",
! 2503: inet_ntoa (iph->ip_src), ifp->name);
! 2504: return 0;
! 2505: }
! 2506: }
! 2507:
! 2508: /* else it must be a local ospf interface, check it was received on
! 2509: * correct link
! 2510: */
! 2511: else if (oi->ifp != ifp)
! 2512: {
! 2513: if (IS_DEBUG_OSPF_EVENT)
! 2514: zlog_warn ("Packet from [%s] received on wrong link %s",
! 2515: inet_ntoa (iph->ip_src), ifp->name);
! 2516: return 0;
! 2517: }
! 2518: else if (oi->state == ISM_Down)
! 2519: {
! 2520: char buf[2][INET_ADDRSTRLEN];
! 2521: zlog_warn ("Ignoring packet from %s to %s received on interface that is "
! 2522: "down [%s]; interface flags are %s",
! 2523: inet_ntop(AF_INET, &iph->ip_src, buf[0], sizeof(buf[0])),
! 2524: inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])),
! 2525: ifp->name, if_flag_dump(ifp->flags));
! 2526: /* Fix multicast memberships? */
! 2527: if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS))
! 2528: OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS);
! 2529: else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS))
! 2530: OI_MEMBER_JOINED(oi, MEMBER_DROUTERS);
! 2531: if (oi->multicast_memberships)
! 2532: ospf_if_set_multicast(oi);
! 2533: return 0;
! 2534: }
! 2535:
! 2536: /*
! 2537: * If the received packet is destined for AllDRouters, the packet
! 2538: * should be accepted only if the received ospf interface state is
! 2539: * either DR or Backup -- endo.
! 2540: */
! 2541: if (iph->ip_dst.s_addr == htonl (OSPF_ALLDROUTERS)
! 2542: && (oi->state != ISM_DR && oi->state != ISM_Backup))
! 2543: {
! 2544: zlog_warn ("Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)",
! 2545: inet_ntoa (iph->ip_src), IF_NAME (oi),
! 2546: LOOKUP (ospf_ism_state_msg, oi->state));
! 2547: /* Try to fix multicast membership. */
! 2548: SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS);
! 2549: ospf_if_set_multicast(oi);
! 2550: return 0;
! 2551: }
! 2552:
! 2553: /* Verify more OSPF header fields. */
! 2554: ret = ospf_verify_header (ibuf, oi, iph, ospfh);
! 2555: if (ret < 0)
! 2556: {
! 2557: if (IS_DEBUG_OSPF_PACKET (0, RECV))
! 2558: zlog_debug ("ospf_read[%s]: Header check failed, "
! 2559: "dropping.",
! 2560: inet_ntoa (iph->ip_src));
! 2561: return ret;
! 2562: }
! 2563:
! 2564: /* Show debug receiving packet. */
! 2565: if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV))
! 2566: {
! 2567: if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL))
! 2568: {
! 2569: zlog_debug ("-----------------------------------------------------");
! 2570: ospf_packet_dump (ibuf);
! 2571: }
! 2572:
! 2573: zlog_debug ("%s received from [%s] via [%s]",
! 2574: ospf_packet_type_str[ospfh->type],
! 2575: inet_ntoa (ospfh->router_id), IF_NAME (oi));
! 2576: zlog_debug (" src [%s],", inet_ntoa (iph->ip_src));
! 2577: zlog_debug (" dst [%s]", inet_ntoa (iph->ip_dst));
! 2578:
! 2579: if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL))
! 2580: zlog_debug ("-----------------------------------------------------");
! 2581: }
! 2582:
! 2583: stream_forward_getp (ibuf, OSPF_HEADER_SIZE);
! 2584:
! 2585: /* Adjust size to message length. */
! 2586: length = ntohs (ospfh->length) - OSPF_HEADER_SIZE;
! 2587:
! 2588: /* Read rest of the packet and call each sort of packet routine. */
! 2589: switch (ospfh->type)
! 2590: {
! 2591: case OSPF_MSG_HELLO:
! 2592: ospf_hello (iph, ospfh, ibuf, oi, length);
! 2593: break;
! 2594: case OSPF_MSG_DB_DESC:
! 2595: ospf_db_desc (iph, ospfh, ibuf, oi, length);
! 2596: break;
! 2597: case OSPF_MSG_LS_REQ:
! 2598: ospf_ls_req (iph, ospfh, ibuf, oi, length);
! 2599: break;
! 2600: case OSPF_MSG_LS_UPD:
! 2601: ospf_ls_upd (iph, ospfh, ibuf, oi, length);
! 2602: break;
! 2603: case OSPF_MSG_LS_ACK:
! 2604: ospf_ls_ack (iph, ospfh, ibuf, oi, length);
! 2605: break;
! 2606: default:
! 2607: zlog (NULL, LOG_WARNING,
! 2608: "interface %s: OSPF packet header type %d is illegal",
! 2609: IF_NAME (oi), ospfh->type);
! 2610: break;
! 2611: }
! 2612:
! 2613: return 0;
! 2614: }
! 2615:
! 2616: /* Make OSPF header. */
! 2617: static void
! 2618: ospf_make_header (int type, struct ospf_interface *oi, struct stream *s)
! 2619: {
! 2620: struct ospf_header *ospfh;
! 2621:
! 2622: ospfh = (struct ospf_header *) STREAM_DATA (s);
! 2623:
! 2624: ospfh->version = (u_char) OSPF_VERSION;
! 2625: ospfh->type = (u_char) type;
! 2626:
! 2627: ospfh->router_id = oi->ospf->router_id;
! 2628:
! 2629: ospfh->checksum = 0;
! 2630: ospfh->area_id = oi->area->area_id;
! 2631: ospfh->auth_type = htons (ospf_auth_type (oi));
! 2632:
! 2633: memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE);
! 2634:
! 2635: stream_forward_endp (s, OSPF_HEADER_SIZE);
! 2636: }
! 2637:
! 2638: /* Make Authentication Data. */
! 2639: static int
! 2640: ospf_make_auth (struct ospf_interface *oi, struct ospf_header *ospfh)
! 2641: {
! 2642: struct crypt_key *ck;
! 2643:
! 2644: switch (ospf_auth_type (oi))
! 2645: {
! 2646: case OSPF_AUTH_NULL:
! 2647: /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */
! 2648: break;
! 2649: case OSPF_AUTH_SIMPLE:
! 2650: memcpy (ospfh->u.auth_data, OSPF_IF_PARAM (oi, auth_simple),
! 2651: OSPF_AUTH_SIMPLE_SIZE);
! 2652: break;
! 2653: case OSPF_AUTH_CRYPTOGRAPHIC:
! 2654: /* If key is not set, then set 0. */
! 2655: if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt)))
! 2656: {
! 2657: ospfh->u.crypt.zero = 0;
! 2658: ospfh->u.crypt.key_id = 0;
! 2659: ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE;
! 2660: }
! 2661: else
! 2662: {
! 2663: ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt)));
! 2664: ospfh->u.crypt.zero = 0;
! 2665: ospfh->u.crypt.key_id = ck->key_id;
! 2666: ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE;
! 2667: }
! 2668: /* note: the seq is done in ospf_make_md5_digest() */
! 2669: break;
! 2670: default:
! 2671: /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */
! 2672: break;
! 2673: }
! 2674:
! 2675: return 0;
! 2676: }
! 2677:
! 2678: /* Fill rest of OSPF header. */
! 2679: static void
! 2680: ospf_fill_header (struct ospf_interface *oi,
! 2681: struct stream *s, u_int16_t length)
! 2682: {
! 2683: struct ospf_header *ospfh;
! 2684:
! 2685: ospfh = (struct ospf_header *) STREAM_DATA (s);
! 2686:
! 2687: /* Fill length. */
! 2688: ospfh->length = htons (length);
! 2689:
! 2690: /* Calculate checksum. */
! 2691: if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC)
! 2692: ospfh->checksum = in_cksum (ospfh, length);
! 2693: else
! 2694: ospfh->checksum = 0;
! 2695:
! 2696: /* Add Authentication Data. */
! 2697: ospf_make_auth (oi, ospfh);
! 2698: }
! 2699:
! 2700: static int
! 2701: ospf_make_hello (struct ospf_interface *oi, struct stream *s)
! 2702: {
! 2703: struct ospf_neighbor *nbr;
! 2704: struct route_node *rn;
! 2705: u_int16_t length = OSPF_HELLO_MIN_SIZE;
! 2706: struct in_addr mask;
! 2707: unsigned long p;
! 2708: int flag = 0;
! 2709:
! 2710: /* Set netmask of interface. */
! 2711: if (oi->type != OSPF_IFTYPE_POINTOPOINT &&
! 2712: oi->type != OSPF_IFTYPE_VIRTUALLINK)
! 2713: masklen2ip (oi->address->prefixlen, &mask);
! 2714: else
! 2715: memset ((char *) &mask, 0, sizeof (struct in_addr));
! 2716: stream_put_ipv4 (s, mask.s_addr);
! 2717:
! 2718: /* Set Hello Interval. */
! 2719: if (OSPF_IF_PARAM (oi, fast_hello) == 0)
! 2720: stream_putw (s, OSPF_IF_PARAM (oi, v_hello));
! 2721: else
! 2722: stream_putw (s, 0); /* hello-interval of 0 for fast-hellos */
! 2723:
! 2724: if (IS_DEBUG_OSPF_EVENT)
! 2725: zlog_debug ("make_hello: options: %x, int: %s",
! 2726: OPTIONS(oi), IF_NAME (oi));
! 2727:
! 2728: /* Set Options. */
! 2729: stream_putc (s, OPTIONS (oi));
! 2730:
! 2731: /* Set Router Priority. */
! 2732: stream_putc (s, PRIORITY (oi));
! 2733:
! 2734: /* Set Router Dead Interval. */
! 2735: stream_putl (s, OSPF_IF_PARAM (oi, v_wait));
! 2736:
! 2737: /* Set Designated Router. */
! 2738: stream_put_ipv4 (s, DR (oi).s_addr);
! 2739:
! 2740: p = stream_get_endp (s);
! 2741:
! 2742: /* Set Backup Designated Router. */
! 2743: stream_put_ipv4 (s, BDR (oi).s_addr);
! 2744:
! 2745: /* Add neighbor seen. */
! 2746: for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
! 2747: if ((nbr = rn->info))
! 2748: if (nbr->router_id.s_addr != 0) /* Ignore 0.0.0.0 node. */
! 2749: if (nbr->state != NSM_Attempt) /* Ignore Down neighbor. */
! 2750: if (nbr->state != NSM_Down) /* This is myself for DR election. */
! 2751: if (!IPV4_ADDR_SAME (&nbr->router_id, &oi->ospf->router_id))
! 2752: {
! 2753: /* Check neighbor is sane? */
! 2754: if (nbr->d_router.s_addr != 0
! 2755: && IPV4_ADDR_SAME (&nbr->d_router, &oi->address->u.prefix4)
! 2756: && IPV4_ADDR_SAME (&nbr->bd_router, &oi->address->u.prefix4))
! 2757: flag = 1;
! 2758:
! 2759: stream_put_ipv4 (s, nbr->router_id.s_addr);
! 2760: length += 4;
! 2761: }
! 2762:
! 2763: /* Let neighbor generate BackupSeen. */
! 2764: if (flag == 1)
! 2765: stream_putl_at (s, p, 0); /* ipv4 address, normally */
! 2766:
! 2767: return length;
! 2768: }
! 2769:
! 2770: static int
! 2771: ospf_make_db_desc (struct ospf_interface *oi, struct ospf_neighbor *nbr,
! 2772: struct stream *s)
! 2773: {
! 2774: struct ospf_lsa *lsa;
! 2775: u_int16_t length = OSPF_DB_DESC_MIN_SIZE;
! 2776: u_char options;
! 2777: unsigned long pp;
! 2778: int i;
! 2779: struct ospf_lsdb *lsdb;
! 2780:
! 2781: /* Set Interface MTU. */
! 2782: if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
! 2783: stream_putw (s, 0);
! 2784: else
! 2785: stream_putw (s, oi->ifp->mtu);
! 2786:
! 2787: /* Set Options. */
! 2788: options = OPTIONS (oi);
! 2789: #ifdef HAVE_OPAQUE_LSA
! 2790: if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE))
! 2791: {
! 2792: if (IS_SET_DD_I (nbr->dd_flags)
! 2793: || CHECK_FLAG (nbr->options, OSPF_OPTION_O))
! 2794: /*
! 2795: * Set O-bit in the outgoing DD packet for capablity negotiation,
! 2796: * if one of following case is applicable.
! 2797: *
! 2798: * 1) WaitTimer expiration event triggered the neighbor state to
! 2799: * change to Exstart, but no (valid) DD packet has received
! 2800: * from the neighbor yet.
! 2801: *
! 2802: * 2) At least one DD packet with O-bit on has received from the
! 2803: * neighbor.
! 2804: */
! 2805: SET_FLAG (options, OSPF_OPTION_O);
! 2806: }
! 2807: #endif /* HAVE_OPAQUE_LSA */
! 2808: stream_putc (s, options);
! 2809:
! 2810: /* DD flags */
! 2811: pp = stream_get_endp (s);
! 2812: stream_putc (s, nbr->dd_flags);
! 2813:
! 2814: /* Set DD Sequence Number. */
! 2815: stream_putl (s, nbr->dd_seqnum);
! 2816:
! 2817: /* shortcut unneeded walk of (empty) summary LSDBs */
! 2818: if (ospf_db_summary_isempty (nbr))
! 2819: goto empty;
! 2820:
! 2821: /* Describe LSA Header from Database Summary List. */
! 2822: lsdb = &nbr->db_sum;
! 2823:
! 2824: for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++)
! 2825: {
! 2826: struct route_table *table = lsdb->type[i].db;
! 2827: struct route_node *rn;
! 2828:
! 2829: for (rn = route_top (table); rn; rn = route_next (rn))
! 2830: if ((lsa = rn->info) != NULL)
! 2831: {
! 2832: #ifdef HAVE_OPAQUE_LSA
! 2833: if (IS_OPAQUE_LSA (lsa->data->type)
! 2834: && (! CHECK_FLAG (options, OSPF_OPTION_O)))
! 2835: {
! 2836: /* Suppress advertising opaque-informations. */
! 2837: /* Remove LSA from DB summary list. */
! 2838: ospf_lsdb_delete (lsdb, lsa);
! 2839: continue;
! 2840: }
! 2841: #endif /* HAVE_OPAQUE_LSA */
! 2842:
! 2843: if (!CHECK_FLAG (lsa->flags, OSPF_LSA_DISCARD))
! 2844: {
! 2845: struct lsa_header *lsah;
! 2846: u_int16_t ls_age;
! 2847:
! 2848: /* DD packet overflows interface MTU. */
! 2849: if (length + OSPF_LSA_HEADER_SIZE > ospf_packet_max (oi))
! 2850: break;
! 2851:
! 2852: /* Keep pointer to LS age. */
! 2853: lsah = (struct lsa_header *) (STREAM_DATA (s) +
! 2854: stream_get_endp (s));
! 2855:
! 2856: /* Proceed stream pointer. */
! 2857: stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE);
! 2858: length += OSPF_LSA_HEADER_SIZE;
! 2859:
! 2860: /* Set LS age. */
! 2861: ls_age = LS_AGE (lsa);
! 2862: lsah->ls_age = htons (ls_age);
! 2863:
! 2864: }
! 2865:
! 2866: /* Remove LSA from DB summary list. */
! 2867: ospf_lsdb_delete (lsdb, lsa);
! 2868: }
! 2869: }
! 2870:
! 2871: /* Update 'More' bit */
! 2872: if (ospf_db_summary_isempty (nbr))
! 2873: {
! 2874: empty:
! 2875: if (nbr->state >= NSM_Exchange)
! 2876: {
! 2877: UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_M);
! 2878: /* Rewrite DD flags */
! 2879: stream_putc_at (s, pp, nbr->dd_flags);
! 2880: }
! 2881: else
! 2882: {
! 2883: assert (IS_SET_DD_M(nbr->dd_flags));
! 2884: }
! 2885: }
! 2886: return length;
! 2887: }
! 2888:
! 2889: static int
! 2890: ospf_make_ls_req_func (struct stream *s, u_int16_t *length,
! 2891: unsigned long delta, struct ospf_neighbor *nbr,
! 2892: struct ospf_lsa *lsa)
! 2893: {
! 2894: struct ospf_interface *oi;
! 2895:
! 2896: oi = nbr->oi;
! 2897:
! 2898: /* LS Request packet overflows interface MTU. */
! 2899: if (*length + delta > ospf_packet_max(oi))
! 2900: return 0;
! 2901:
! 2902: stream_putl (s, lsa->data->type);
! 2903: stream_put_ipv4 (s, lsa->data->id.s_addr);
! 2904: stream_put_ipv4 (s, lsa->data->adv_router.s_addr);
! 2905:
! 2906: ospf_lsa_unlock (&nbr->ls_req_last);
! 2907: nbr->ls_req_last = ospf_lsa_lock (lsa);
! 2908:
! 2909: *length += 12;
! 2910: return 1;
! 2911: }
! 2912:
! 2913: static int
! 2914: ospf_make_ls_req (struct ospf_neighbor *nbr, struct stream *s)
! 2915: {
! 2916: struct ospf_lsa *lsa;
! 2917: u_int16_t length = OSPF_LS_REQ_MIN_SIZE;
! 2918: unsigned long delta = stream_get_endp(s)+12;
! 2919: struct route_table *table;
! 2920: struct route_node *rn;
! 2921: int i;
! 2922: struct ospf_lsdb *lsdb;
! 2923:
! 2924: lsdb = &nbr->ls_req;
! 2925:
! 2926: for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++)
! 2927: {
! 2928: table = lsdb->type[i].db;
! 2929: for (rn = route_top (table); rn; rn = route_next (rn))
! 2930: if ((lsa = (rn->info)) != NULL)
! 2931: if (ospf_make_ls_req_func (s, &length, delta, nbr, lsa) == 0)
! 2932: {
! 2933: route_unlock_node (rn);
! 2934: break;
! 2935: }
! 2936: }
! 2937: return length;
! 2938: }
! 2939:
! 2940: static int
! 2941: ls_age_increment (struct ospf_lsa *lsa, int delay)
! 2942: {
! 2943: int age;
! 2944:
! 2945: age = IS_LSA_MAXAGE (lsa) ? OSPF_LSA_MAXAGE : LS_AGE (lsa) + delay;
! 2946:
! 2947: return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age);
! 2948: }
! 2949:
! 2950: static int
! 2951: ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream *s)
! 2952: {
! 2953: struct ospf_lsa *lsa;
! 2954: struct listnode *node;
! 2955: u_int16_t length = 0;
! 2956: unsigned int size_noauth;
! 2957: unsigned long delta = stream_get_endp (s);
! 2958: unsigned long pp;
! 2959: int count = 0;
! 2960:
! 2961: if (IS_DEBUG_OSPF_EVENT)
! 2962: zlog_debug ("ospf_make_ls_upd: Start");
! 2963:
! 2964: pp = stream_get_endp (s);
! 2965: stream_forward_endp (s, OSPF_LS_UPD_MIN_SIZE);
! 2966: length += OSPF_LS_UPD_MIN_SIZE;
! 2967:
! 2968: /* Calculate amount of packet usable for data. */
! 2969: size_noauth = stream_get_size(s) - ospf_packet_authspace(oi);
! 2970:
! 2971: while ((node = listhead (update)) != NULL)
! 2972: {
! 2973: struct lsa_header *lsah;
! 2974: u_int16_t ls_age;
! 2975:
! 2976: if (IS_DEBUG_OSPF_EVENT)
! 2977: zlog_debug ("ospf_make_ls_upd: List Iteration");
! 2978:
! 2979: lsa = listgetdata (node);
! 2980:
! 2981: assert (lsa->data);
! 2982:
! 2983: /* Will it fit? */
! 2984: if (length + delta + ntohs (lsa->data->length) > size_noauth)
! 2985: break;
! 2986:
! 2987: /* Keep pointer to LS age. */
! 2988: lsah = (struct lsa_header *) (STREAM_DATA (s) + stream_get_endp (s));
! 2989:
! 2990: /* Put LSA to Link State Request. */
! 2991: stream_put (s, lsa->data, ntohs (lsa->data->length));
! 2992:
! 2993: /* Set LS age. */
! 2994: /* each hop must increment an lsa_age by transmit_delay
! 2995: of OSPF interface */
! 2996: ls_age = ls_age_increment (lsa, OSPF_IF_PARAM (oi, transmit_delay));
! 2997: lsah->ls_age = htons (ls_age);
! 2998:
! 2999: length += ntohs (lsa->data->length);
! 3000: count++;
! 3001:
! 3002: list_delete_node (update, node);
! 3003: ospf_lsa_unlock (&lsa); /* oi->ls_upd_queue */
! 3004: }
! 3005:
! 3006: /* Now set #LSAs. */
! 3007: stream_putl_at (s, pp, count);
! 3008:
! 3009: if (IS_DEBUG_OSPF_EVENT)
! 3010: zlog_debug ("ospf_make_ls_upd: Stop");
! 3011: return length;
! 3012: }
! 3013:
! 3014: static int
! 3015: ospf_make_ls_ack (struct ospf_interface *oi, struct list *ack, struct stream *s)
! 3016: {
! 3017: struct listnode *node, *nnode;
! 3018: u_int16_t length = OSPF_LS_ACK_MIN_SIZE;
! 3019: unsigned long delta = stream_get_endp(s) + 24;
! 3020: struct ospf_lsa *lsa;
! 3021:
! 3022: for (ALL_LIST_ELEMENTS (ack, node, nnode, lsa))
! 3023: {
! 3024: assert (lsa);
! 3025:
! 3026: if (length + delta > ospf_packet_max (oi))
! 3027: break;
! 3028:
! 3029: stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE);
! 3030: length += OSPF_LSA_HEADER_SIZE;
! 3031:
! 3032: listnode_delete (ack, lsa);
! 3033: ospf_lsa_unlock (&lsa); /* oi->ls_ack_direct.ls_ack */
! 3034: }
! 3035:
! 3036: return length;
! 3037: }
! 3038:
! 3039: static void
! 3040: ospf_hello_send_sub (struct ospf_interface *oi, in_addr_t addr)
! 3041: {
! 3042: struct ospf_packet *op;
! 3043: u_int16_t length = OSPF_HEADER_SIZE;
! 3044:
! 3045: op = ospf_packet_new (oi->ifp->mtu);
! 3046:
! 3047: /* Prepare OSPF common header. */
! 3048: ospf_make_header (OSPF_MSG_HELLO, oi, op->s);
! 3049:
! 3050: /* Prepare OSPF Hello body. */
! 3051: length += ospf_make_hello (oi, op->s);
! 3052:
! 3053: /* Fill OSPF header. */
! 3054: ospf_fill_header (oi, op->s, length);
! 3055:
! 3056: /* Set packet length. */
! 3057: op->length = length;
! 3058:
! 3059: op->dst.s_addr = addr;
! 3060:
! 3061: /* Add packet to the top of the interface output queue, so that they
! 3062: * can't get delayed by things like long queues of LS Update packets
! 3063: */
! 3064: ospf_packet_add_top (oi, op);
! 3065:
! 3066: /* Hook thread to write packet. */
! 3067: OSPF_ISM_WRITE_ON (oi->ospf);
! 3068: }
! 3069:
! 3070: static void
! 3071: ospf_poll_send (struct ospf_nbr_nbma *nbr_nbma)
! 3072: {
! 3073: struct ospf_interface *oi;
! 3074:
! 3075: oi = nbr_nbma->oi;
! 3076: assert(oi);
! 3077:
! 3078: /* If this is passive interface, do not send OSPF Hello. */
! 3079: if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE)
! 3080: return;
! 3081:
! 3082: if (oi->type != OSPF_IFTYPE_NBMA)
! 3083: return;
! 3084:
! 3085: if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down)
! 3086: return;
! 3087:
! 3088: if (PRIORITY(oi) == 0)
! 3089: return;
! 3090:
! 3091: if (nbr_nbma->priority == 0
! 3092: && oi->state != ISM_DR && oi->state != ISM_Backup)
! 3093: return;
! 3094:
! 3095: ospf_hello_send_sub (oi, nbr_nbma->addr.s_addr);
! 3096: }
! 3097:
! 3098: int
! 3099: ospf_poll_timer (struct thread *thread)
! 3100: {
! 3101: struct ospf_nbr_nbma *nbr_nbma;
! 3102:
! 3103: nbr_nbma = THREAD_ARG (thread);
! 3104: nbr_nbma->t_poll = NULL;
! 3105:
! 3106: if (IS_DEBUG_OSPF (nsm, NSM_TIMERS))
! 3107: zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Poll timer expire)",
! 3108: IF_NAME (nbr_nbma->oi), inet_ntoa (nbr_nbma->addr));
! 3109:
! 3110: ospf_poll_send (nbr_nbma);
! 3111:
! 3112: if (nbr_nbma->v_poll > 0)
! 3113: OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer,
! 3114: nbr_nbma->v_poll);
! 3115:
! 3116: return 0;
! 3117: }
! 3118:
! 3119:
! 3120: int
! 3121: ospf_hello_reply_timer (struct thread *thread)
! 3122: {
! 3123: struct ospf_neighbor *nbr;
! 3124:
! 3125: nbr = THREAD_ARG (thread);
! 3126: nbr->t_hello_reply = NULL;
! 3127:
! 3128: assert (nbr->oi);
! 3129:
! 3130: if (IS_DEBUG_OSPF (nsm, NSM_TIMERS))
! 3131: zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (hello-reply timer expire)",
! 3132: IF_NAME (nbr->oi), inet_ntoa (nbr->router_id));
! 3133:
! 3134: ospf_hello_send_sub (nbr->oi, nbr->address.u.prefix4.s_addr);
! 3135:
! 3136: return 0;
! 3137: }
! 3138:
! 3139: /* Send OSPF Hello. */
! 3140: void
! 3141: ospf_hello_send (struct ospf_interface *oi)
! 3142: {
! 3143: /* If this is passive interface, do not send OSPF Hello. */
! 3144: if (OSPF_IF_PASSIVE_STATUS (oi) == OSPF_IF_PASSIVE)
! 3145: return;
! 3146:
! 3147: if (oi->type == OSPF_IFTYPE_NBMA)
! 3148: {
! 3149: struct ospf_neighbor *nbr;
! 3150: struct route_node *rn;
! 3151:
! 3152: for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
! 3153: if ((nbr = rn->info))
! 3154: if (nbr != oi->nbr_self)
! 3155: if (nbr->state != NSM_Down)
! 3156: {
! 3157: /* RFC 2328 Section 9.5.1
! 3158: If the router is not eligible to become Designated Router,
! 3159: it must periodically send Hello Packets to both the
! 3160: Designated Router and the Backup Designated Router (if they
! 3161: exist). */
! 3162: if (PRIORITY(oi) == 0 &&
! 3163: IPV4_ADDR_CMP(&DR(oi), &nbr->address.u.prefix4) &&
! 3164: IPV4_ADDR_CMP(&BDR(oi), &nbr->address.u.prefix4))
! 3165: continue;
! 3166:
! 3167: /* If the router is eligible to become Designated Router, it
! 3168: must periodically send Hello Packets to all neighbors that
! 3169: are also eligible. In addition, if the router is itself the
! 3170: Designated Router or Backup Designated Router, it must also
! 3171: send periodic Hello Packets to all other neighbors. */
! 3172:
! 3173: if (nbr->priority == 0 && oi->state == ISM_DROther)
! 3174: continue;
! 3175: /* if oi->state == Waiting, send hello to all neighbors */
! 3176: ospf_hello_send_sub (oi, nbr->address.u.prefix4.s_addr);
! 3177: }
! 3178: }
! 3179: else
! 3180: {
! 3181: /* Decide destination address. */
! 3182: if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
! 3183: ospf_hello_send_sub (oi, oi->vl_data->peer_addr.s_addr);
! 3184: else
! 3185: ospf_hello_send_sub (oi, htonl (OSPF_ALLSPFROUTERS));
! 3186: }
! 3187: }
! 3188:
! 3189: /* Send OSPF Database Description. */
! 3190: void
! 3191: ospf_db_desc_send (struct ospf_neighbor *nbr)
! 3192: {
! 3193: struct ospf_interface *oi;
! 3194: struct ospf_packet *op;
! 3195: u_int16_t length = OSPF_HEADER_SIZE;
! 3196:
! 3197: oi = nbr->oi;
! 3198: op = ospf_packet_new (oi->ifp->mtu);
! 3199:
! 3200: /* Prepare OSPF common header. */
! 3201: ospf_make_header (OSPF_MSG_DB_DESC, oi, op->s);
! 3202:
! 3203: /* Prepare OSPF Database Description body. */
! 3204: length += ospf_make_db_desc (oi, nbr, op->s);
! 3205:
! 3206: /* Fill OSPF header. */
! 3207: ospf_fill_header (oi, op->s, length);
! 3208:
! 3209: /* Set packet length. */
! 3210: op->length = length;
! 3211:
! 3212: /* Decide destination address. */
! 3213: if (oi->type == OSPF_IFTYPE_POINTOPOINT)
! 3214: op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3215: else
! 3216: op->dst = nbr->address.u.prefix4;
! 3217:
! 3218: /* Add packet to the interface output queue. */
! 3219: ospf_packet_add (oi, op);
! 3220:
! 3221: /* Hook thread to write packet. */
! 3222: OSPF_ISM_WRITE_ON (oi->ospf);
! 3223:
! 3224: /* Remove old DD packet, then copy new one and keep in neighbor structure. */
! 3225: if (nbr->last_send)
! 3226: ospf_packet_free (nbr->last_send);
! 3227: nbr->last_send = ospf_packet_dup (op);
! 3228: quagga_gettime (QUAGGA_CLK_MONOTONIC, &nbr->last_send_ts);
! 3229: }
! 3230:
! 3231: /* Re-send Database Description. */
! 3232: void
! 3233: ospf_db_desc_resend (struct ospf_neighbor *nbr)
! 3234: {
! 3235: struct ospf_interface *oi;
! 3236:
! 3237: oi = nbr->oi;
! 3238:
! 3239: /* Add packet to the interface output queue. */
! 3240: ospf_packet_add (oi, ospf_packet_dup (nbr->last_send));
! 3241:
! 3242: /* Hook thread to write packet. */
! 3243: OSPF_ISM_WRITE_ON (oi->ospf);
! 3244: }
! 3245:
! 3246: /* Send Link State Request. */
! 3247: void
! 3248: ospf_ls_req_send (struct ospf_neighbor *nbr)
! 3249: {
! 3250: struct ospf_interface *oi;
! 3251: struct ospf_packet *op;
! 3252: u_int16_t length = OSPF_HEADER_SIZE;
! 3253:
! 3254: oi = nbr->oi;
! 3255: op = ospf_packet_new (oi->ifp->mtu);
! 3256:
! 3257: /* Prepare OSPF common header. */
! 3258: ospf_make_header (OSPF_MSG_LS_REQ, oi, op->s);
! 3259:
! 3260: /* Prepare OSPF Link State Request body. */
! 3261: length += ospf_make_ls_req (nbr, op->s);
! 3262: if (length == OSPF_HEADER_SIZE)
! 3263: {
! 3264: ospf_packet_free (op);
! 3265: return;
! 3266: }
! 3267:
! 3268: /* Fill OSPF header. */
! 3269: ospf_fill_header (oi, op->s, length);
! 3270:
! 3271: /* Set packet length. */
! 3272: op->length = length;
! 3273:
! 3274: /* Decide destination address. */
! 3275: if (oi->type == OSPF_IFTYPE_POINTOPOINT)
! 3276: op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3277: else
! 3278: op->dst = nbr->address.u.prefix4;
! 3279:
! 3280: /* Add packet to the interface output queue. */
! 3281: ospf_packet_add (oi, op);
! 3282:
! 3283: /* Hook thread to write packet. */
! 3284: OSPF_ISM_WRITE_ON (oi->ospf);
! 3285:
! 3286: /* Add Link State Request Retransmission Timer. */
! 3287: OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req);
! 3288: }
! 3289:
! 3290: /* Send Link State Update with an LSA. */
! 3291: void
! 3292: ospf_ls_upd_send_lsa (struct ospf_neighbor *nbr, struct ospf_lsa *lsa,
! 3293: int flag)
! 3294: {
! 3295: struct list *update;
! 3296:
! 3297: update = list_new ();
! 3298:
! 3299: listnode_add (update, lsa);
! 3300: ospf_ls_upd_send (nbr, update, flag);
! 3301:
! 3302: list_delete (update);
! 3303: }
! 3304:
! 3305: /* Determine size for packet. Must be at least big enough to accomodate next
! 3306: * LSA on list, which may be bigger than MTU size.
! 3307: *
! 3308: * Return pointer to new ospf_packet
! 3309: * NULL if we can not allocate, eg because LSA is bigger than imposed limit
! 3310: * on packet sizes (in which case offending LSA is deleted from update list)
! 3311: */
! 3312: static struct ospf_packet *
! 3313: ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi)
! 3314: {
! 3315: struct ospf_lsa *lsa;
! 3316: struct listnode *ln;
! 3317: size_t size;
! 3318: static char warned = 0;
! 3319:
! 3320: lsa = listgetdata((ln = listhead (update)));
! 3321: assert (lsa->data);
! 3322:
! 3323: if ((OSPF_LS_UPD_MIN_SIZE + ntohs (lsa->data->length))
! 3324: > ospf_packet_max (oi))
! 3325: {
! 3326: if (!warned)
! 3327: {
! 3328: zlog_warn ("ospf_ls_upd_packet_new: oversized LSA encountered!"
! 3329: "will need to fragment. Not optimal. Try divide up"
! 3330: " your network with areas. Use 'debug ospf packet send'"
! 3331: " to see details, or look at 'show ip ospf database ..'");
! 3332: warned = 1;
! 3333: }
! 3334:
! 3335: if (IS_DEBUG_OSPF_PACKET (0, SEND))
! 3336: zlog_debug ("ospf_ls_upd_packet_new: oversized LSA id:%s,"
! 3337: " %d bytes originated by %s, will be fragmented!",
! 3338: inet_ntoa (lsa->data->id),
! 3339: ntohs (lsa->data->length),
! 3340: inet_ntoa (lsa->data->adv_router));
! 3341:
! 3342: /*
! 3343: * Allocate just enough to fit this LSA only, to avoid including other
! 3344: * LSAs in fragmented LSA Updates.
! 3345: */
! 3346: size = ntohs (lsa->data->length) + (oi->ifp->mtu - ospf_packet_max (oi))
! 3347: + OSPF_LS_UPD_MIN_SIZE;
! 3348: }
! 3349: else
! 3350: size = oi->ifp->mtu;
! 3351:
! 3352: if (size > OSPF_MAX_PACKET_SIZE)
! 3353: {
! 3354: zlog_warn ("ospf_ls_upd_packet_new: oversized LSA id:%s too big,"
! 3355: " %d bytes, packet size %ld, dropping it completely."
! 3356: " OSPF routing is broken!",
! 3357: inet_ntoa (lsa->data->id), ntohs (lsa->data->length),
! 3358: (long int) size);
! 3359: list_delete_node (update, ln);
! 3360: return NULL;
! 3361: }
! 3362:
! 3363: /* IP header is built up separately by ospf_write(). This means, that we must
! 3364: * reduce the "affordable" size just calculated by length of an IP header.
! 3365: * This makes sure, that even if we manage to fill the payload with LSA data
! 3366: * completely, the final packet (our data plus IP header) still fits into
! 3367: * outgoing interface MTU. This correction isn't really meaningful for an
! 3368: * oversized LSA, but for consistency the correction is done for both cases.
! 3369: *
! 3370: * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
! 3371: */
! 3372: return ospf_packet_new (size - sizeof (struct ip));
! 3373: }
! 3374:
! 3375: static void
! 3376: ospf_ls_upd_queue_send (struct ospf_interface *oi, struct list *update,
! 3377: struct in_addr addr)
! 3378: {
! 3379: struct ospf_packet *op;
! 3380: u_int16_t length = OSPF_HEADER_SIZE;
! 3381:
! 3382: if (IS_DEBUG_OSPF_EVENT)
! 3383: zlog_debug ("listcount = %d, dst %s", listcount (update), inet_ntoa(addr));
! 3384:
! 3385: op = ospf_ls_upd_packet_new (update, oi);
! 3386:
! 3387: /* Prepare OSPF common header. */
! 3388: ospf_make_header (OSPF_MSG_LS_UPD, oi, op->s);
! 3389:
! 3390: /* Prepare OSPF Link State Update body.
! 3391: * Includes Type-7 translation.
! 3392: */
! 3393: length += ospf_make_ls_upd (oi, update, op->s);
! 3394:
! 3395: /* Fill OSPF header. */
! 3396: ospf_fill_header (oi, op->s, length);
! 3397:
! 3398: /* Set packet length. */
! 3399: op->length = length;
! 3400:
! 3401: /* Decide destination address. */
! 3402: if (oi->type == OSPF_IFTYPE_POINTOPOINT)
! 3403: op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3404: else
! 3405: op->dst.s_addr = addr.s_addr;
! 3406:
! 3407: /* Add packet to the interface output queue. */
! 3408: ospf_packet_add (oi, op);
! 3409:
! 3410: /* Hook thread to write packet. */
! 3411: OSPF_ISM_WRITE_ON (oi->ospf);
! 3412: }
! 3413:
! 3414: static int
! 3415: ospf_ls_upd_send_queue_event (struct thread *thread)
! 3416: {
! 3417: struct ospf_interface *oi = THREAD_ARG(thread);
! 3418: struct route_node *rn;
! 3419: struct route_node *rnext;
! 3420: struct list *update;
! 3421: char again = 0;
! 3422:
! 3423: oi->t_ls_upd_event = NULL;
! 3424:
! 3425: if (IS_DEBUG_OSPF_EVENT)
! 3426: zlog_debug ("ospf_ls_upd_send_queue start");
! 3427:
! 3428: for (rn = route_top (oi->ls_upd_queue); rn; rn = rnext)
! 3429: {
! 3430: rnext = route_next (rn);
! 3431:
! 3432: if (rn->info == NULL)
! 3433: continue;
! 3434:
! 3435: update = (struct list *)rn->info;
! 3436:
! 3437: ospf_ls_upd_queue_send (oi, update, rn->p.u.prefix4);
! 3438:
! 3439: /* list might not be empty. */
! 3440: if (listcount(update) == 0)
! 3441: {
! 3442: list_delete (rn->info);
! 3443: rn->info = NULL;
! 3444: route_unlock_node (rn);
! 3445: }
! 3446: else
! 3447: again = 1;
! 3448: }
! 3449:
! 3450: if (again != 0)
! 3451: {
! 3452: if (IS_DEBUG_OSPF_EVENT)
! 3453: zlog_debug ("ospf_ls_upd_send_queue: update lists not cleared,"
! 3454: " %d nodes to try again, raising new event", again);
! 3455: oi->t_ls_upd_event =
! 3456: thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0);
! 3457: }
! 3458:
! 3459: if (IS_DEBUG_OSPF_EVENT)
! 3460: zlog_debug ("ospf_ls_upd_send_queue stop");
! 3461:
! 3462: return 0;
! 3463: }
! 3464:
! 3465: void
! 3466: ospf_ls_upd_send (struct ospf_neighbor *nbr, struct list *update, int flag)
! 3467: {
! 3468: struct ospf_interface *oi;
! 3469: struct ospf_lsa *lsa;
! 3470: struct prefix_ipv4 p;
! 3471: struct route_node *rn;
! 3472: struct listnode *node;
! 3473:
! 3474: oi = nbr->oi;
! 3475:
! 3476: p.family = AF_INET;
! 3477: p.prefixlen = IPV4_MAX_BITLEN;
! 3478:
! 3479: /* Decide destination address. */
! 3480: if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
! 3481: p.prefix = oi->vl_data->peer_addr;
! 3482: else if (oi->type == OSPF_IFTYPE_POINTOPOINT)
! 3483: p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3484: else if (flag == OSPF_SEND_PACKET_DIRECT)
! 3485: p.prefix = nbr->address.u.prefix4;
! 3486: else if (oi->state == ISM_DR || oi->state == ISM_Backup)
! 3487: p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3488: else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT)
! 3489: p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3490: else
! 3491: p.prefix.s_addr = htonl (OSPF_ALLDROUTERS);
! 3492:
! 3493: if (oi->type == OSPF_IFTYPE_NBMA)
! 3494: {
! 3495: if (flag == OSPF_SEND_PACKET_INDIRECT)
! 3496: zlog_warn ("* LS-Update is directly sent on NBMA network.");
! 3497: if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix.s_addr))
! 3498: zlog_warn ("* LS-Update is sent to myself.");
! 3499: }
! 3500:
! 3501: rn = route_node_get (oi->ls_upd_queue, (struct prefix *) &p);
! 3502:
! 3503: if (rn->info == NULL)
! 3504: rn->info = list_new ();
! 3505:
! 3506: for (ALL_LIST_ELEMENTS_RO (update, node, lsa))
! 3507: listnode_add (rn->info, ospf_lsa_lock (lsa)); /* oi->ls_upd_queue */
! 3508:
! 3509: if (oi->t_ls_upd_event == NULL)
! 3510: oi->t_ls_upd_event =
! 3511: thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0);
! 3512: }
! 3513:
! 3514: static void
! 3515: ospf_ls_ack_send_list (struct ospf_interface *oi, struct list *ack,
! 3516: struct in_addr dst)
! 3517: {
! 3518: struct ospf_packet *op;
! 3519: u_int16_t length = OSPF_HEADER_SIZE;
! 3520:
! 3521: op = ospf_packet_new (oi->ifp->mtu);
! 3522:
! 3523: /* Prepare OSPF common header. */
! 3524: ospf_make_header (OSPF_MSG_LS_ACK, oi, op->s);
! 3525:
! 3526: /* Prepare OSPF Link State Acknowledgment body. */
! 3527: length += ospf_make_ls_ack (oi, ack, op->s);
! 3528:
! 3529: /* Fill OSPF header. */
! 3530: ospf_fill_header (oi, op->s, length);
! 3531:
! 3532: /* Set packet length. */
! 3533: op->length = length;
! 3534:
! 3535: /* Set destination IP address. */
! 3536: op->dst = dst;
! 3537:
! 3538: /* Add packet to the interface output queue. */
! 3539: ospf_packet_add (oi, op);
! 3540:
! 3541: /* Hook thread to write packet. */
! 3542: OSPF_ISM_WRITE_ON (oi->ospf);
! 3543: }
! 3544:
! 3545: static int
! 3546: ospf_ls_ack_send_event (struct thread *thread)
! 3547: {
! 3548: struct ospf_interface *oi = THREAD_ARG (thread);
! 3549:
! 3550: oi->t_ls_ack_direct = NULL;
! 3551:
! 3552: while (listcount (oi->ls_ack_direct.ls_ack))
! 3553: ospf_ls_ack_send_list (oi, oi->ls_ack_direct.ls_ack,
! 3554: oi->ls_ack_direct.dst);
! 3555:
! 3556: return 0;
! 3557: }
! 3558:
! 3559: void
! 3560: ospf_ls_ack_send (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
! 3561: {
! 3562: struct ospf_interface *oi = nbr->oi;
! 3563:
! 3564: if (listcount (oi->ls_ack_direct.ls_ack) == 0)
! 3565: oi->ls_ack_direct.dst = nbr->address.u.prefix4;
! 3566:
! 3567: listnode_add (oi->ls_ack_direct.ls_ack, ospf_lsa_lock (lsa));
! 3568:
! 3569: if (oi->t_ls_ack_direct == NULL)
! 3570: oi->t_ls_ack_direct =
! 3571: thread_add_event (master, ospf_ls_ack_send_event, oi, 0);
! 3572: }
! 3573:
! 3574: /* Send Link State Acknowledgment delayed. */
! 3575: void
! 3576: ospf_ls_ack_send_delayed (struct ospf_interface *oi)
! 3577: {
! 3578: struct in_addr dst;
! 3579:
! 3580: /* Decide destination address. */
! 3581: /* RFC2328 Section 13.5 On non-broadcast
! 3582: networks, delayed Link State Acknowledgment packets must be
! 3583: unicast separately over each adjacency (i.e., neighbor whose
! 3584: state is >= Exchange). */
! 3585: if (oi->type == OSPF_IFTYPE_NBMA)
! 3586: {
! 3587: struct ospf_neighbor *nbr;
! 3588: struct route_node *rn;
! 3589:
! 3590: for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
! 3591: if ((nbr = rn->info) != NULL)
! 3592: if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange)
! 3593: while (listcount (oi->ls_ack))
! 3594: ospf_ls_ack_send_list (oi, oi->ls_ack, nbr->address.u.prefix4);
! 3595: return;
! 3596: }
! 3597: if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
! 3598: dst.s_addr = oi->vl_data->peer_addr.s_addr;
! 3599: else if (oi->state == ISM_DR || oi->state == ISM_Backup)
! 3600: dst.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3601: else if (oi->type == OSPF_IFTYPE_POINTOPOINT)
! 3602: dst.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3603: else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT)
! 3604: dst.s_addr = htonl (OSPF_ALLSPFROUTERS);
! 3605: else
! 3606: dst.s_addr = htonl (OSPF_ALLDROUTERS);
! 3607:
! 3608: while (listcount (oi->ls_ack))
! 3609: ospf_ls_ack_send_list (oi, oi->ls_ack, dst);
! 3610: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to ospf_packet.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / quagga / ospfd