2 * OSPF Sending and Receiving OSPF Packets.
3 * Copyright (C) 1999, 2000 Toshiaki Takada
5 * This file is part of GNU Zebra.
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
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.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; see the file COPYING; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
31 #include "sockunion.h"
36 #ifdef CRYPTO_INTERNAL
40 #include "lib_errors.h"
42 #include "ospfd/ospfd.h"
43 #include "ospfd/ospf_network.h"
44 #include "ospfd/ospf_interface.h"
45 #include "ospfd/ospf_ism.h"
46 #include "ospfd/ospf_asbr.h"
47 #include "ospfd/ospf_lsa.h"
48 #include "ospfd/ospf_lsdb.h"
49 #include "ospfd/ospf_neighbor.h"
50 #include "ospfd/ospf_nsm.h"
51 #include "ospfd/ospf_packet.h"
52 #include "ospfd/ospf_spf.h"
53 #include "ospfd/ospf_flood.h"
54 #include "ospfd/ospf_dump.h"
55 #include "ospfd/ospf_errors.h"
58 * OSPF Fragmentation / fragmented writes
60 * ospfd can support writing fragmented packets, for cases where
61 * kernel will not fragment IP_HDRINCL and/or multicast destined
62 * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However,
63 * SunOS, probably BSD too, clobber the user supplied IP ID and IP
64 * flags fields, hence user-space fragmentation will not work.
65 * Only Linux is known to leave IP header unmolested.
66 * Further, fragmentation really should be done the kernel, which already
67 * supports it, and which avoids nasty IP ID state problems.
69 * Fragmentation of OSPF packets can be required on networks with router
70 * with many many interfaces active in one area, or on networks with links
74 #define WANT_OSPF_WRITE_FRAGMENT
77 /* Packet Type String. */
78 const struct message ospf_packet_type_str
[] = {
79 {OSPF_MSG_HELLO
, "Hello"},
80 {OSPF_MSG_DB_DESC
, "Database Description"},
81 {OSPF_MSG_LS_REQ
, "Link State Request"},
82 {OSPF_MSG_LS_UPD
, "Link State Update"},
83 {OSPF_MSG_LS_ACK
, "Link State Acknowledgment"},
86 /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of
87 particular types, offset is the "type" field of a packet. */
88 static const uint16_t ospf_packet_minlen
[] = {
91 OSPF_DB_DESC_MIN_SIZE
,
97 /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular
98 types, offset is the "LSA type" field. */
99 static const uint16_t ospf_lsa_minlen
[] = {
101 OSPF_ROUTER_LSA_MIN_SIZE
,
102 OSPF_NETWORK_LSA_MIN_SIZE
,
103 OSPF_SUMMARY_LSA_MIN_SIZE
,
104 OSPF_SUMMARY_LSA_MIN_SIZE
,
105 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
107 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
114 /* for ospf_check_auth() */
115 static int ospf_check_sum(struct ospf_header
*);
117 /* OSPF authentication checking function */
118 static int ospf_auth_type(struct ospf_interface
*oi
)
122 if (OSPF_IF_PARAM(oi
, auth_type
) == OSPF_AUTH_NOTSET
)
123 auth_type
= oi
->area
->auth_type
;
125 auth_type
= OSPF_IF_PARAM(oi
, auth_type
);
127 /* Handle case where MD5 key list is not configured aka Cisco */
128 if (auth_type
== OSPF_AUTH_CRYPTOGRAPHIC
129 && list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
130 return OSPF_AUTH_NULL
;
135 struct ospf_packet
*ospf_packet_new(size_t size
)
137 struct ospf_packet
*new;
139 new = XCALLOC(MTYPE_OSPF_PACKET
, sizeof(struct ospf_packet
));
140 new->s
= stream_new(size
);
145 void ospf_packet_free(struct ospf_packet
*op
)
150 XFREE(MTYPE_OSPF_PACKET
, op
);
153 struct ospf_fifo
*ospf_fifo_new(void)
155 struct ospf_fifo
*new;
157 new = XCALLOC(MTYPE_OSPF_FIFO
, sizeof(struct ospf_fifo
));
161 /* Add new packet to fifo. */
162 void ospf_fifo_push(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
165 fifo
->tail
->next
= op
;
174 /* Add new packet to head of fifo. */
175 static void ospf_fifo_push_head(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
177 op
->next
= fifo
->head
;
179 if (fifo
->tail
== NULL
)
187 /* Delete first packet from fifo. */
188 struct ospf_packet
*ospf_fifo_pop(struct ospf_fifo
*fifo
)
190 struct ospf_packet
*op
;
195 fifo
->head
= op
->next
;
197 if (fifo
->head
== NULL
)
206 /* Return first fifo entry. */
207 struct ospf_packet
*ospf_fifo_head(struct ospf_fifo
*fifo
)
212 /* Flush ospf packet fifo. */
213 void ospf_fifo_flush(struct ospf_fifo
*fifo
)
215 struct ospf_packet
*op
;
216 struct ospf_packet
*next
;
218 for (op
= fifo
->head
; op
; op
= next
) {
220 ospf_packet_free(op
);
222 fifo
->head
= fifo
->tail
= NULL
;
226 /* Free ospf packet fifo. */
227 void ospf_fifo_free(struct ospf_fifo
*fifo
)
229 ospf_fifo_flush(fifo
);
231 XFREE(MTYPE_OSPF_FIFO
, fifo
);
234 void ospf_packet_add(struct ospf_interface
*oi
, struct ospf_packet
*op
)
239 "ospf_packet_add(interface %s in state %d [%s], packet type %s, "
240 "destination %s) called with NULL obuf, ignoring "
241 "(please report this bug)!\n",
242 IF_NAME(oi
), oi
->state
,
243 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
),
244 lookup_msg(ospf_packet_type_str
,
245 stream_getc_from(op
->s
, 1), NULL
),
250 /* Add packet to end of queue. */
251 ospf_fifo_push(oi
->obuf
, op
);
253 /* Debug of packet fifo*/
254 /* ospf_fifo_debug (oi->obuf); */
257 static void ospf_packet_add_top(struct ospf_interface
*oi
,
258 struct ospf_packet
*op
)
263 "ospf_packet_add(interface %s in state %d [%s], packet type %s, "
264 "destination %s) called with NULL obuf, ignoring "
265 "(please report this bug)!\n",
266 IF_NAME(oi
), oi
->state
,
267 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
),
268 lookup_msg(ospf_packet_type_str
,
269 stream_getc_from(op
->s
, 1), NULL
),
274 /* Add packet to head of queue. */
275 ospf_fifo_push_head(oi
->obuf
, op
);
277 /* Debug of packet fifo*/
278 /* ospf_fifo_debug (oi->obuf); */
281 void ospf_packet_delete(struct ospf_interface
*oi
)
283 struct ospf_packet
*op
;
285 op
= ospf_fifo_pop(oi
->obuf
);
288 ospf_packet_free(op
);
291 struct ospf_packet
*ospf_packet_dup(struct ospf_packet
*op
)
293 struct ospf_packet
*new;
295 if (stream_get_endp(op
->s
) != op
->length
)
298 "ospf_packet_dup stream %lu ospf_packet %u size mismatch",
299 (unsigned long)STREAM_SIZE(op
->s
), op
->length
);
301 /* Reserve space for MD5 authentication that may be added later. */
302 new = ospf_packet_new(stream_get_endp(op
->s
) + OSPF_AUTH_MD5_SIZE
);
303 stream_copy(new->s
, op
->s
);
306 new->length
= op
->length
;
312 static unsigned int ospf_packet_authspace(struct ospf_interface
*oi
)
316 if (ospf_auth_type(oi
) == OSPF_AUTH_CRYPTOGRAPHIC
)
317 auth
= OSPF_AUTH_MD5_SIZE
;
322 static unsigned int ospf_packet_max(struct ospf_interface
*oi
)
326 max
= oi
->ifp
->mtu
- ospf_packet_authspace(oi
);
328 max
-= (OSPF_HEADER_SIZE
+ sizeof(struct ip
));
334 static int ospf_check_md5_digest(struct ospf_interface
*oi
,
335 struct ospf_header
*ospfh
)
337 #ifdef CRYPTO_OPENSSL
339 #elif CRYPTO_INTERNAL
342 unsigned char digest
[OSPF_AUTH_MD5_SIZE
];
343 struct crypt_key
*ck
;
344 struct ospf_neighbor
*nbr
;
345 uint16_t length
= ntohs(ospfh
->length
);
347 /* Get secret key. */
348 ck
= ospf_crypt_key_lookup(OSPF_IF_PARAM(oi
, auth_crypt
),
349 ospfh
->u
.crypt
.key_id
);
351 flog_warn(EC_OSPF_MD5
, "interface %s: ospf_check_md5 no key %d",
352 IF_NAME(oi
), ospfh
->u
.crypt
.key_id
);
356 /* check crypto seqnum. */
357 nbr
= ospf_nbr_lookup_by_routerid(oi
->nbrs
, &ospfh
->router_id
);
360 && ntohl(nbr
->crypt_seqnum
) > ntohl(ospfh
->u
.crypt
.crypt_seqnum
)) {
363 "interface %s: ospf_check_md5 bad sequence %d (expect %d)",
364 IF_NAME(oi
), ntohl(ospfh
->u
.crypt
.crypt_seqnum
),
365 ntohl(nbr
->crypt_seqnum
));
369 /* Generate a digest for the ospf packet - their digest + our digest. */
370 #ifdef CRYPTO_OPENSSL
371 unsigned int md5_size
= OSPF_AUTH_MD5_SIZE
;
372 ctx
= EVP_MD_CTX_new();
373 EVP_DigestInit(ctx
, EVP_md5());
374 EVP_DigestUpdate(ctx
, ospfh
, length
);
375 EVP_DigestUpdate(ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
376 EVP_DigestFinal(ctx
, digest
, &md5_size
);
377 EVP_MD_CTX_free(ctx
);
378 #elif CRYPTO_INTERNAL
379 memset(&ctx
, 0, sizeof(ctx
));
381 MD5Update(&ctx
, ospfh
, length
);
382 MD5Update(&ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
383 MD5Final(digest
, &ctx
);
386 /* compare the two */
387 if (memcmp((caddr_t
)ospfh
+ length
, digest
, OSPF_AUTH_MD5_SIZE
)) {
388 flog_warn(EC_OSPF_MD5
,
389 "interface %s: ospf_check_md5 checksum mismatch",
394 /* save neighbor's crypt_seqnum */
396 nbr
->crypt_seqnum
= ospfh
->u
.crypt
.crypt_seqnum
;
400 /* This function is called from ospf_write(), it will detect the
401 authentication scheme and if it is MD5, it will change the sequence
402 and update the MD5 digest. */
403 static int ospf_make_md5_digest(struct ospf_interface
*oi
,
404 struct ospf_packet
*op
)
406 struct ospf_header
*ospfh
;
407 unsigned char digest
[OSPF_AUTH_MD5_SIZE
] = {0};
408 #ifdef CRYPTO_OPENSSL
410 #elif CRYPTO_INTERNAL
415 struct crypt_key
*ck
;
416 const uint8_t *auth_key
;
418 ibuf
= STREAM_DATA(op
->s
);
419 ospfh
= (struct ospf_header
*)ibuf
;
421 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
424 /* We do this here so when we dup a packet, we don't have to
425 waste CPU rewriting other headers.
427 Note that quagga_time /deliberately/ is not used here */
428 t
= (time(NULL
) & 0xFFFFFFFF);
429 if (t
> oi
->crypt_seqnum
)
430 oi
->crypt_seqnum
= t
;
434 ospfh
->u
.crypt
.crypt_seqnum
= htonl(oi
->crypt_seqnum
);
436 /* Get MD5 Authentication key from auth_key list. */
437 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
438 auth_key
= (const uint8_t *)digest
;
440 ck
= listgetdata(listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
441 auth_key
= ck
->auth_key
;
444 /* Generate a digest for the entire packet + our secret key. */
445 #ifdef CRYPTO_OPENSSL
446 unsigned int md5_size
= OSPF_AUTH_MD5_SIZE
;
447 ctx
= EVP_MD_CTX_new();
448 EVP_DigestInit(ctx
, EVP_md5());
449 EVP_DigestUpdate(ctx
, ibuf
, ntohs(ospfh
->length
));
450 EVP_DigestUpdate(ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
451 EVP_DigestFinal(ctx
, digest
, &md5_size
);
452 EVP_MD_CTX_free(ctx
);
453 #elif CRYPTO_INTERNAL
454 memset(&ctx
, 0, sizeof(ctx
));
456 MD5Update(&ctx
, ibuf
, ntohs(ospfh
->length
));
457 MD5Update(&ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
458 MD5Final(digest
, &ctx
);
461 /* Append md5 digest to the end of the stream. */
462 stream_put(op
->s
, digest
, OSPF_AUTH_MD5_SIZE
);
464 /* We do *NOT* increment the OSPF header length. */
465 op
->length
= ntohs(ospfh
->length
) + OSPF_AUTH_MD5_SIZE
;
467 if (stream_get_endp(op
->s
) != op
->length
)
471 "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u",
472 (unsigned long)stream_get_endp(op
->s
), op
->length
);
474 return OSPF_AUTH_MD5_SIZE
;
478 static int ospf_ls_req_timer(struct thread
*thread
)
480 struct ospf_neighbor
*nbr
;
482 nbr
= THREAD_ARG(thread
);
483 nbr
->t_ls_req
= NULL
;
485 /* Send Link State Request. */
486 if (ospf_ls_request_count(nbr
))
487 ospf_ls_req_send(nbr
);
489 /* Set Link State Request retransmission timer. */
490 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
495 void ospf_ls_req_event(struct ospf_neighbor
*nbr
)
498 thread_cancel(nbr
->t_ls_req
);
499 nbr
->t_ls_req
= NULL
;
501 nbr
->t_ls_req
= NULL
;
502 thread_add_event(master
, ospf_ls_req_timer
, nbr
, 0, &nbr
->t_ls_req
);
505 /* Cyclic timer function. Fist registered in ospf_nbr_new () in
507 int ospf_ls_upd_timer(struct thread
*thread
)
509 struct ospf_neighbor
*nbr
;
511 nbr
= THREAD_ARG(thread
);
512 nbr
->t_ls_upd
= NULL
;
514 /* Send Link State Update. */
515 if (ospf_ls_retransmit_count(nbr
) > 0) {
517 struct ospf_lsdb
*lsdb
;
519 int retransmit_interval
;
521 retransmit_interval
=
522 OSPF_IF_PARAM(nbr
->oi
, retransmit_interval
);
524 lsdb
= &nbr
->ls_rxmt
;
527 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
528 struct route_table
*table
= lsdb
->type
[i
].db
;
529 struct route_node
*rn
;
531 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
532 struct ospf_lsa
*lsa
;
534 if ((lsa
= rn
->info
) != NULL
) {
535 /* Don't retransmit an LSA if we
537 the last RxmtInterval seconds - this
539 neighbour a chance to acknowledge the
541 have ben just received before the
543 fired. This is a small tweak to what
545 but it will cut out out a lot of
548 if (monotime_since(&lsa
->tv_recv
, NULL
)
549 >= retransmit_interval
* 1000000LL)
550 listnode_add(update
, rn
->info
);
555 if (listcount(update
) > 0)
556 ospf_ls_upd_send(nbr
, update
, OSPF_SEND_PACKET_DIRECT
,
558 list_delete(&update
);
561 /* Set LS Update retransmission timer. */
562 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
, nbr
->v_ls_upd
);
567 int ospf_ls_ack_timer(struct thread
*thread
)
569 struct ospf_interface
*oi
;
571 oi
= THREAD_ARG(thread
);
574 /* Send Link State Acknowledgment. */
575 if (listcount(oi
->ls_ack
) > 0)
576 ospf_ls_ack_send_delayed(oi
);
578 /* Set LS Ack timer. */
579 OSPF_ISM_TIMER_ON(oi
->t_ls_ack
, ospf_ls_ack_timer
, oi
->v_ls_ack
);
584 #ifdef WANT_OSPF_WRITE_FRAGMENT
585 static void ospf_write_frags(int fd
, struct ospf_packet
*op
, struct ip
*iph
,
586 struct msghdr
*msg
, unsigned int maxdatasize
,
587 unsigned int mtu
, int flags
, uint8_t type
)
589 #define OSPF_WRITE_FRAG_SHIFT 3
594 assert(op
->length
== stream_get_endp(op
->s
));
595 assert(msg
->msg_iovlen
== 2);
599 * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
600 * well as the IP_MF flag, making this all quite pointless.
602 * However, for a system on which IP_MF is left alone, and ip_id left
603 * alone or else which sets same ip_id for each fragment this might
606 * XXX-TODO: It would be much nicer to have the kernel's use their
607 * existing fragmentation support to do this for us. Bugs/RFEs need to
608 * be raised against the various kernels.
612 iph
->ip_off
|= IP_MF
;
614 /* ip frag offset is expressed in units of 8byte words */
615 offset
= maxdatasize
>> OSPF_WRITE_FRAG_SHIFT
;
617 iovp
= &msg
->msg_iov
[1];
619 while ((stream_get_endp(op
->s
) - stream_get_getp(op
->s
))
621 /* data length of this frag is to next offset value */
622 iovp
->iov_len
= offset
<< OSPF_WRITE_FRAG_SHIFT
;
623 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
624 assert(iph
->ip_len
<= mtu
);
626 sockopt_iphdrincl_swab_htosys(iph
);
628 ret
= sendmsg(fd
, msg
, flags
);
630 sockopt_iphdrincl_swab_systoh(iph
);
635 "*** ospf_write_frags: sendmsg failed to %s,"
636 " id %d, off %d, len %d, mtu %u failed with %s",
637 inet_ntoa(iph
->ip_dst
), iph
->ip_id
, iph
->ip_off
,
638 iph
->ip_len
, mtu
, safe_strerror(errno
));
640 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
642 "ospf_write_frags: sent id %d, off %d, len %d to %s\n",
643 iph
->ip_id
, iph
->ip_off
, iph
->ip_len
,
644 inet_ntoa(iph
->ip_dst
));
645 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
647 "-----------------IP Header Dump----------------------");
648 ospf_ip_header_dump(iph
);
650 "-----------------------------------------------------");
654 iph
->ip_off
+= offset
;
655 stream_forward_getp(op
->s
, iovp
->iov_len
);
656 iovp
->iov_base
= stream_pnt(op
->s
);
659 /* setup for final fragment */
660 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
661 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
662 iph
->ip_off
&= (~IP_MF
);
664 #endif /* WANT_OSPF_WRITE_FRAGMENT */
666 static int ospf_write(struct thread
*thread
)
668 struct ospf
*ospf
= THREAD_ARG(thread
);
669 struct ospf_interface
*oi
;
670 struct ospf_interface
*last_serviced_oi
= NULL
;
671 struct ospf_packet
*op
;
672 struct sockaddr_in sa_dst
;
679 struct listnode
*node
;
680 #ifdef WANT_OSPF_WRITE_FRAGMENT
681 static uint16_t ipid
= 0;
682 uint16_t maxdatasize
;
683 #endif /* WANT_OSPF_WRITE_FRAGMENT */
684 #define OSPF_WRITE_IPHL_SHIFT 2
688 unsigned char cmsgbuf
[64] = {};
689 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
690 struct in_pktinfo
*pi
;
693 if (ospf
->fd
< 0 || ospf
->oi_running
== 0) {
694 if (IS_DEBUG_OSPF_EVENT
)
696 "ospf_write failed to send, fd %d, instance %u"
697 ,ospf
->fd
, ospf
->oi_running
);
701 ospf
->t_write
= NULL
;
703 node
= listhead(ospf
->oi_write_q
);
705 oi
= listgetdata(node
);
708 #ifdef WANT_OSPF_WRITE_FRAGMENT
709 /* seed ipid static with low order bits of time */
711 ipid
= (time(NULL
) & 0xffff);
712 #endif /* WANT_OSPF_WRITE_FRAGMENT */
714 while ((pkt_count
< ospf
->write_oi_count
) && oi
715 && (last_serviced_oi
!= oi
)) {
716 /* If there is only packet in the queue, the oi is removed from
717 write-q, so fix up the last interface that was serviced */
718 if (last_serviced_oi
== NULL
) {
719 last_serviced_oi
= oi
;
722 #ifdef WANT_OSPF_WRITE_FRAGMENT
723 /* convenience - max OSPF data per packet */
724 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
725 #endif /* WANT_OSPF_WRITE_FRAGMENT */
726 /* Get one packet from queue. */
727 op
= ospf_fifo_head(oi
->obuf
);
729 assert(op
->length
>= OSPF_HEADER_SIZE
);
731 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
732 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
733 ospf_if_ipmulticast(ospf
, oi
->address
,
736 /* Rewrite the md5 signature & update the seq */
737 ospf_make_md5_digest(oi
, op
);
739 /* Retrieve OSPF packet type. */
740 stream_set_getp(op
->s
, 1);
741 type
= stream_getc(op
->s
);
743 /* reset get pointer */
744 stream_set_getp(op
->s
, 0);
746 memset(&iph
, 0, sizeof(struct ip
));
747 memset(&sa_dst
, 0, sizeof(sa_dst
));
749 sa_dst
.sin_family
= AF_INET
;
750 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
751 sa_dst
.sin_len
= sizeof(sa_dst
);
752 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
753 sa_dst
.sin_addr
= op
->dst
;
754 sa_dst
.sin_port
= htons(0);
756 /* Set DONTROUTE flag if dst is unicast. */
757 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
758 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
759 flags
= MSG_DONTROUTE
;
761 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
762 /* it'd be very strange for header to not be 4byte-word aligned
764 if (sizeof(struct ip
)
765 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
766 iph
.ip_hl
++; /* we presume sizeof struct ip cant
769 iph
.ip_v
= IPVERSION
;
770 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
771 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
773 #if defined(__DragonFly__)
775 * DragonFly's raw socket expects ip_len/ip_off in network byte
778 iph
.ip_len
= htons(iph
.ip_len
);
781 #ifdef WANT_OSPF_WRITE_FRAGMENT
782 /* XXX-MT: not thread-safe at all..
783 * XXX: this presumes this is only programme sending OSPF
785 * otherwise, no guarantee ipid will be unique
788 #endif /* WANT_OSPF_WRITE_FRAGMENT */
791 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
792 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
794 iph
.ip_ttl
= OSPF_IP_TTL
;
795 iph
.ip_p
= IPPROTO_OSPFIGP
;
797 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
798 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
800 memset(&msg
, 0, sizeof(msg
));
801 msg
.msg_name
= (caddr_t
)&sa_dst
;
802 msg
.msg_namelen
= sizeof(sa_dst
);
806 iov
[0].iov_base
= (char *)&iph
;
807 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
808 iov
[1].iov_base
= stream_pnt(op
->s
);
809 iov
[1].iov_len
= op
->length
;
812 msg
.msg_control
= (caddr_t
)cm
;
813 cm
->cmsg_level
= SOL_IP
;
814 cm
->cmsg_type
= IP_PKTINFO
;
815 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
816 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
817 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
819 msg
.msg_controllen
= cm
->cmsg_len
;
822 /* Sadly we can not rely on kernels to fragment packets
823 * because of either IP_HDRINCL and/or multicast
824 * destination being set.
827 #ifdef WANT_OSPF_WRITE_FRAGMENT
828 if (op
->length
> maxdatasize
)
829 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
830 oi
->ifp
->mtu
, flags
, type
);
831 #endif /* WANT_OSPF_WRITE_FRAGMENT */
833 /* send final fragment (could be first) */
834 sockopt_iphdrincl_swab_htosys(&iph
);
835 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
836 sockopt_iphdrincl_swab_systoh(&iph
);
837 if (IS_DEBUG_OSPF_EVENT
)
840 "id %d, off %d, len %d, interface %s, mtu %u:",
841 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
842 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
847 "*** sendmsg in ospf_write failed to %s, "
848 "id %d, off %d, len %d, interface %s, mtu %u: %s",
849 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
850 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
851 safe_strerror(errno
));
853 /* Show debug sending packet. */
854 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
855 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
857 "-----------------------------------------------------");
858 ospf_ip_header_dump(&iph
);
859 stream_set_getp(op
->s
, 0);
860 ospf_packet_dump(op
->s
);
863 zlog_debug("%s sent to [%s] via [%s].",
864 lookup_msg(ospf_packet_type_str
, type
, NULL
),
865 inet_ntoa(op
->dst
), IF_NAME(oi
));
867 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
869 "-----------------------------------------------------");
876 case OSPF_MSG_DB_DESC
:
879 case OSPF_MSG_LS_REQ
:
882 case OSPF_MSG_LS_UPD
:
885 case OSPF_MSG_LS_ACK
:
892 /* Now delete packet from queue. */
893 ospf_packet_delete(oi
);
895 /* Move this interface to the tail of write_q to
896 serve everyone in a round robin fashion */
897 list_delete_node(ospf
->oi_write_q
, node
);
898 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
900 last_serviced_oi
= NULL
;
903 listnode_add(ospf
->oi_write_q
, oi
);
906 /* Setup to service from the head of the queue again */
907 if (!list_isempty(ospf
->oi_write_q
)) {
908 node
= listhead(ospf
->oi_write_q
);
910 oi
= listgetdata(node
);
915 /* If packets still remain in queue, call write thread. */
916 if (!list_isempty(ospf
->oi_write_q
))
917 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
923 /* OSPF Hello message read -- RFC2328 Section 10.5. */
924 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
925 struct stream
*s
, struct ospf_interface
*oi
, int size
)
927 struct ospf_hello
*hello
;
928 struct ospf_neighbor
*nbr
;
932 /* increment statistics. */
935 hello
= (struct ospf_hello
*)stream_pnt(s
);
937 /* If Hello is myself, silently discard. */
938 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
939 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
941 "ospf_header[%s/%s]: selforiginated, "
943 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
945 inet_ntoa(iph
->ip_src
));
950 /* get neighbor prefix. */
952 p
.prefixlen
= ip_masklen(hello
->network_mask
);
953 p
.u
.prefix4
= iph
->ip_src
;
955 /* Compare network mask. */
956 /* Checking is ignored for Point-to-Point and Virtual link. */
957 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
958 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
959 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
962 "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
963 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
),
964 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
968 /* Compare Router Dead Interval. */
969 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
970 flog_warn(EC_OSPF_PACKET
,
971 "Packet %s [Hello:RECV]: RouterDeadInterval mismatch "
972 "(expected %u, but received %u).",
973 inet_ntoa(ospfh
->router_id
),
974 OSPF_IF_PARAM(oi
, v_wait
),
975 ntohl(hello
->dead_interval
));
979 /* Compare Hello Interval - ignored if fast-hellos are set. */
980 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
981 if (OSPF_IF_PARAM(oi
, v_hello
)
982 != ntohs(hello
->hello_interval
)) {
985 "Packet %s [Hello:RECV]: HelloInterval mismatch "
986 "(expected %u, but received %u).",
987 inet_ntoa(ospfh
->router_id
),
988 OSPF_IF_PARAM(oi
, v_hello
),
989 ntohs(hello
->hello_interval
));
994 if (IS_DEBUG_OSPF_EVENT
)
995 zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s",
996 inet_ntoa(ospfh
->router_id
),
997 ospf_options_dump(hello
->options
),
998 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
1000 /* Compare options. */
1001 #define REJECT_IF_TBIT_ON 1 /* XXX */
1002 #ifdef REJECT_IF_TBIT_ON
1003 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
1005 * This router does not support non-zero TOS.
1006 * Drop this Hello packet not to establish neighbor
1009 flog_warn(EC_OSPF_PACKET
,
1010 "Packet %s [Hello:RECV]: T-bit on, drop it.",
1011 inet_ntoa(ospfh
->router_id
));
1014 #endif /* REJECT_IF_TBIT_ON */
1016 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
1017 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
1019 * This router does know the correct usage of O-bit
1020 * the bit should be set in DD packet only.
1022 flog_warn(EC_OSPF_PACKET
,
1023 "Packet %s [Hello:RECV]: O-bit abuse?",
1024 inet_ntoa(ospfh
->router_id
));
1025 #ifdef STRICT_OBIT_USAGE_CHECK
1026 return; /* Reject this packet. */
1027 #else /* STRICT_OBIT_USAGE_CHECK */
1028 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
1029 #endif /* STRICT_OBIT_USAGE_CHECK */
1032 /* new for NSSA is to ensure that NP is on and E is off */
1034 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
1035 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
1036 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
1037 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1038 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
1041 "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x",
1042 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1046 if (IS_DEBUG_OSPF_NSSA
)
1047 zlog_debug("NSSA-Hello:RECV:Packet from %s:",
1048 inet_ntoa(ospfh
->router_id
));
1050 /* The setting of the E-bit found in the Hello Packet's Options
1051 field must match this area's ExternalRoutingCapability A
1052 mismatch causes processing to stop and the packet to be
1053 dropped. The setting of the rest of the bits in the Hello
1054 Packet's Options field should be ignored. */
1055 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1056 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1059 "Packet %s [Hello:RECV]: my options: %x, his options %x",
1060 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1065 /* get neighbour struct */
1066 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1068 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1071 old_state
= nbr
->state
;
1073 /* Add event to thread. */
1074 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1076 /* RFC2328 Section 9.5.1
1077 If the router is not eligible to become Designated Router,
1078 (snip) It must also send an Hello Packet in reply to an
1079 Hello Packet received from any eligible neighbor (other than
1080 the current Designated Router and Backup Designated Router). */
1081 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1082 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1083 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1084 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1085 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1086 ospf_hello_reply_timer
,
1087 OSPF_HELLO_REPLY_DELAY
);
1089 /* on NBMA network type, it happens to receive bidirectional Hello
1091 without advance 1-Way Received event.
1092 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1093 if (oi
->type
== OSPF_IFTYPE_NBMA
1094 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1095 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1096 nbr
->priority
= hello
->priority
;
1097 nbr
->d_router
= hello
->d_router
;
1098 nbr
->bd_router
= hello
->bd_router
;
1102 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1103 size
- OSPF_HELLO_MIN_SIZE
)) {
1104 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1105 nbr
->options
|= hello
->options
;
1107 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1108 /* Set neighbor information. */
1109 nbr
->priority
= hello
->priority
;
1110 nbr
->d_router
= hello
->d_router
;
1111 nbr
->bd_router
= hello
->bd_router
;
1115 /* If neighbor itself declares DR and no BDR exists,
1116 cause event BackupSeen */
1117 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1118 if (hello
->bd_router
.s_addr
== 0 && oi
->state
== ISM_Waiting
)
1119 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1121 /* neighbor itself declares BDR. */
1122 if (oi
->state
== ISM_Waiting
1123 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
))
1124 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1126 /* had not previously. */
1127 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1128 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1129 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1130 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->d_router
)))
1131 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1133 /* had not previously. */
1134 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1135 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1136 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1137 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
)))
1138 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1140 /* Neighbor priority check. */
1141 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1142 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1144 /* Set neighbor information. */
1145 nbr
->priority
= hello
->priority
;
1146 nbr
->d_router
= hello
->d_router
;
1147 nbr
->bd_router
= hello
->bd_router
;
1150 /* Save DD flags/options/Seqnum received. */
1151 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1152 struct ospf_db_desc
*dd
)
1154 nbr
->last_recv
.flags
= dd
->flags
;
1155 nbr
->last_recv
.options
= dd
->options
;
1156 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1159 /* Process rest of DD packet. */
1160 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1161 struct ospf_neighbor
*nbr
,
1162 struct ospf_db_desc
*dd
, uint16_t size
)
1164 struct ospf_lsa
*new, *find
;
1165 struct lsa_header
*lsah
;
1167 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1168 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1169 size
-= OSPF_LSA_HEADER_SIZE
) {
1170 lsah
= (struct lsa_header
*)stream_pnt(s
);
1171 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1173 /* Unknown LS type. */
1174 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1175 flog_warn(EC_OSPF_PACKET
,
1176 "Packet [DD:RECV]: Unknown LS type %d.",
1178 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1182 if (IS_OPAQUE_LSA(lsah
->type
)
1183 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1184 flog_warn(EC_OSPF_PACKET
,
1185 "LSA[Type%d:%s]: Opaque capability mismatch?",
1186 lsah
->type
, inet_ntoa(lsah
->id
));
1187 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1191 switch (lsah
->type
) {
1192 case OSPF_AS_EXTERNAL_LSA
:
1193 case OSPF_OPAQUE_AS_LSA
:
1194 /* Check for stub area. Reject if AS-External from stub
1196 allow if from NSSA. */
1197 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1200 "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.",
1201 lsah
->type
, inet_ntoa(lsah
->id
),
1202 (oi
->area
->external_routing
1206 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1207 NSM_SeqNumberMismatch
);
1215 /* Create LS-request object. */
1216 new = ospf_ls_request_new(lsah
);
1218 /* Lookup received LSA, then add LS request list. */
1219 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1221 /* ospf_lsa_more_recent is fine with NULL pointers */
1222 switch (ospf_lsa_more_recent(find
, new)) {
1224 /* Neighbour has a more recent LSA, we must request it
1226 ospf_ls_request_add(nbr
, new);
1229 /* If we have a copy of this LSA, it's either less
1231 * and we're requesting it from neighbour (the case
1233 * it's as recent and we both have same copy (this
1236 * In neither of these two cases is there any point in
1237 * describing our copy of the LSA to the neighbour in a
1238 * DB-Summary packet, if we're still intending to do so.
1240 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1241 * backward compatible optimisation to OSPF DB Exchange
1243 * DB Description process implemented here.
1246 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1247 ospf_lsa_discard(new);
1250 /* We have the more recent copy, nothing specific to do:
1251 * - no need to request neighbours stale copy
1252 * - must leave DB summary list copy alone
1254 if (IS_DEBUG_OSPF_EVENT
)
1256 "Packet [DD:RECV]: LSA received Type %d, "
1257 "ID %s is not recent.",
1258 lsah
->type
, inet_ntoa(lsah
->id
));
1259 ospf_lsa_discard(new);
1264 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1267 /* Both sides have no More, then we're done with Exchange */
1268 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1269 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1271 ospf_db_desc_send(nbr
);
1275 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1277 /* Send DD packet in reply.
1279 * Must be done to acknowledge the Master's DD, regardless of
1280 * whether we have more LSAs ourselves to describe.
1282 * This function will clear the 'More' bit, if after this DD
1283 * we have no more LSAs to describe to the master..
1285 ospf_db_desc_send(nbr
);
1287 /* Slave can raise ExchangeDone now, if master is also done */
1288 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1289 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1292 /* Save received neighbor values from DD. */
1293 ospf_db_desc_save_current(nbr
, dd
);
1296 ospf_ls_req_send(nbr
);
1299 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1300 struct ospf_neighbor
*nbr
)
1302 /* Is DD duplicated? */
1303 if (dd
->options
== nbr
->last_recv
.options
1304 && dd
->flags
== nbr
->last_recv
.flags
1305 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1311 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1312 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1313 struct stream
*s
, struct ospf_interface
*oi
,
1316 struct ospf_db_desc
*dd
;
1317 struct ospf_neighbor
*nbr
;
1319 /* Increment statistics. */
1322 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1324 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1326 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %s",
1327 inet_ntoa(ospfh
->router_id
));
1332 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1333 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1336 "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u",
1337 inet_ntoa(nbr
->router_id
), ntohs(dd
->mtu
), IF_NAME(oi
),
1343 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1345 * required. In fact at least JunOS sends DD packets with P bit clear.
1346 * Until proper solution is developped, this hack should help.
1348 * Update: According to the RFCs, N bit is specified /only/ for Hello
1349 * options, unfortunately its use in DD options is not specified. Hence
1351 * implementations follow E-bit semantics and set it in DD options, and
1353 * treat it as unspecified and hence follow the directive "default for
1354 * options is clear", ie unset.
1356 * Reset the flag, as ospfd follows E-bit semantics.
1358 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1359 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1360 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1361 if (IS_DEBUG_OSPF_EVENT
)
1363 "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options",
1364 inet_ntoa(nbr
->router_id
));
1365 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1368 #ifdef REJECT_IF_TBIT_ON
1369 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1371 * In Hello protocol, optional capability must have checked
1372 * to prevent this T-bit enabled router be my neighbor.
1374 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %s: T-bit on?",
1375 inet_ntoa(nbr
->router_id
));
1378 #endif /* REJECT_IF_TBIT_ON */
1380 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1381 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1383 * This node is not configured to handle O-bit, for now.
1384 * Clear it to ignore unsupported capability proposed by
1387 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1390 /* Add event to thread. */
1391 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1393 /* Process DD packet by neighbor status. */
1394 switch (nbr
->state
) {
1400 "Packet[DD]: Neighbor %s state is %s, packet discarded.",
1401 inet_ntoa(nbr
->router_id
),
1402 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1405 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1406 /* If the new state is ExStart, the processing of the current
1407 packet should then continue in this new state by falling
1408 through to case ExStart below. */
1409 if (nbr
->state
!= NSM_ExStart
)
1414 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1415 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1416 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1418 /* We're Slave---obey */
1419 if (CHECK_FLAG(oi
->ospf
->config
,
1420 OSPF_LOG_ADJACENCY_DETAIL
))
1422 "Packet[DD]: Neighbor %s Negotiation done (Slave).",
1423 inet_ntoa(nbr
->router_id
));
1425 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1428 UNSET_FLAG(nbr
->dd_flags
,
1429 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1431 /* We're Master, ignore the initial DBD from
1433 if (CHECK_FLAG(oi
->ospf
->config
,
1434 OSPF_LOG_ADJACENCY_DETAIL
))
1436 "Packet[DD]: Neighbor %s: Initial DBD from Slave, "
1438 inet_ntoa(nbr
->router_id
));
1442 /* Ack from the Slave */
1443 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1444 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1445 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1448 "Packet[DD]: Neighbor %s Negotiation done (Master).",
1449 inet_ntoa(nbr
->router_id
));
1450 /* Reset I, leaving MS */
1451 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1453 flog_warn(EC_OSPF_PACKET
,
1454 "Packet[DD]: Neighbor %s Negotiation fails.",
1455 inet_ntoa(nbr
->router_id
));
1459 /* This is where the real Options are saved */
1460 nbr
->options
= dd
->options
;
1462 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1463 if (IS_DEBUG_OSPF_EVENT
)
1465 "Neighbor[%s] is %sOpaque-capable.",
1466 inet_ntoa(nbr
->router_id
),
1467 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1471 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1472 && IPV4_ADDR_SAME(&DR(oi
),
1473 &nbr
->address
.u
.prefix4
)) {
1476 "DR-neighbor[%s] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1477 inet_ntoa(nbr
->router_id
));
1478 /* This situation is undesirable, but not a real
1483 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1485 /* continue processing rest of packet. */
1486 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1489 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1490 if (IS_SET_DD_MS(nbr
->dd_flags
))
1491 /* Master: discard duplicated DD packet. */
1493 "Packet[DD] (Master): Neighbor %s packet duplicated.",
1494 inet_ntoa(nbr
->router_id
));
1496 /* Slave: cause to retransmit the last Database
1500 "Packet[DD] [Slave]: Neighbor %s packet duplicated.",
1501 inet_ntoa(nbr
->router_id
));
1502 ospf_db_desc_resend(nbr
);
1507 /* Otherwise DD packet should be checked. */
1508 /* Check Master/Slave bit mismatch */
1509 if (IS_SET_DD_MS(dd
->flags
)
1510 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1511 flog_warn(EC_OSPF_PACKET
,
1512 "Packet[DD]: Neighbor %s MS-bit mismatch.",
1513 inet_ntoa(nbr
->router_id
));
1514 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1515 if (IS_DEBUG_OSPF_EVENT
)
1517 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1518 dd
->flags
, nbr
->dd_flags
);
1522 /* Check initialize bit is set. */
1523 if (IS_SET_DD_I(dd
->flags
)) {
1524 zlog_info("Packet[DD]: Neighbor %s I-bit set.",
1525 inet_ntoa(nbr
->router_id
));
1526 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1530 /* Check DD Options. */
1531 if (dd
->options
!= nbr
->options
) {
1532 #ifdef ORIGINAL_CODING
1533 /* Save the new options for debugging */
1534 nbr
->options
= dd
->options
;
1535 #endif /* ORIGINAL_CODING */
1536 flog_warn(EC_OSPF_PACKET
,
1537 "Packet[DD]: Neighbor %s options mismatch.",
1538 inet_ntoa(nbr
->router_id
));
1539 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1543 /* Check DD sequence number. */
1544 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1545 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1546 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1547 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1550 "Packet[DD]: Neighbor %s sequence number mismatch.",
1551 inet_ntoa(nbr
->router_id
));
1552 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1556 /* Continue processing rest of packet. */
1557 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1561 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1562 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1563 /* Master should discard duplicate DD packet. */
1565 "Packet[DD]: Neighbor %s duplicated, "
1566 "packet discarded.",
1567 inet_ntoa(nbr
->router_id
));
1570 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1571 < nbr
->v_inactivity
* 1000000LL) {
1572 /* In states Loading and Full the slave
1574 its last Database Description packet
1576 duplicate Database Description
1578 from the master. For this reason the
1580 wait RouterDeadInterval seconds
1582 last Database Description packet.
1584 Database Description packet from the
1586 this interval will generate a
1588 neighbor event. RFC2328 Section 10.8
1590 ospf_db_desc_resend(nbr
);
1596 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1599 flog_warn(EC_OSPF_PACKET
,
1600 "Packet[DD]: Neighbor %s NSM illegal status %u.",
1601 inet_ntoa(nbr
->router_id
), nbr
->state
);
1606 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1608 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1609 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1610 struct stream
*s
, struct ospf_interface
*oi
,
1613 struct ospf_neighbor
*nbr
;
1615 struct in_addr ls_id
;
1616 struct in_addr adv_router
;
1617 struct ospf_lsa
*find
;
1618 struct list
*ls_upd
;
1619 unsigned int length
;
1621 /* Increment statistics. */
1624 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1626 flog_warn(EC_OSPF_PACKET
,
1627 "Link State Request: Unknown Neighbor %s.",
1628 inet_ntoa(ospfh
->router_id
));
1632 /* Add event to thread. */
1633 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1635 /* Neighbor State should be Exchange or later. */
1636 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1637 && nbr
->state
!= NSM_Full
) {
1640 "Link State Request received from %s: Neighbor state is %s, packet discarded.",
1641 inet_ntoa(ospfh
->router_id
),
1642 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1646 /* Send Link State Update for ALL requested LSAs. */
1647 ls_upd
= list_new();
1648 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1650 while (size
>= OSPF_LSA_KEY_SIZE
) {
1651 /* Get one slice of Link State Request. */
1652 ls_type
= stream_getl(s
);
1653 ls_id
.s_addr
= stream_get_ipv4(s
);
1654 adv_router
.s_addr
= stream_get_ipv4(s
);
1656 /* Verify LSA type. */
1657 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1658 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1659 list_delete(&ls_upd
);
1663 /* Search proper LSA in LSDB. */
1664 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1667 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1668 list_delete(&ls_upd
);
1672 /* Packet overflows MTU size, send immediately. */
1673 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1674 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1675 ospf_ls_upd_send(nbr
, ls_upd
,
1676 OSPF_SEND_PACKET_DIRECT
, 0);
1678 ospf_ls_upd_send(nbr
, ls_upd
,
1679 OSPF_SEND_PACKET_INDIRECT
, 0);
1681 /* Only remove list contents. Keep ls_upd. */
1682 list_delete_all_node(ls_upd
);
1684 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1687 /* Append LSA to update list. */
1688 listnode_add(ls_upd
, find
);
1689 length
+= ntohs(find
->data
->length
);
1691 size
-= OSPF_LSA_KEY_SIZE
;
1694 /* Send rest of Link State Update. */
1695 if (listcount(ls_upd
) > 0) {
1696 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1697 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1700 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1703 list_delete(&ls_upd
);
1705 list_delete(&ls_upd
);
1708 /* Get the list of LSAs from Link State Update packet.
1709 And process some validation -- RFC2328 Section 13. (1)-(2). */
1710 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1712 struct ospf_interface
*oi
, size_t size
)
1714 uint16_t count
, sum
;
1716 struct lsa_header
*lsah
;
1717 struct ospf_lsa
*lsa
;
1722 count
= stream_getl(s
);
1723 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1725 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1726 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1727 lsah
= (struct lsa_header
*)stream_pnt(s
);
1728 length
= ntohs(lsah
->length
);
1730 if (length
> size
) {
1733 "Link State Update: LSA length exceeds packet size.");
1737 /* Validate the LSA's LS checksum. */
1738 sum
= lsah
->checksum
;
1739 if (!ospf_lsa_checksum_valid(lsah
)) {
1740 /* (bug #685) more details in a one-line message make it
1742 * to identify problem source on the one hand and to
1744 * chance to compress repeated messages in syslog on the
1748 "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s",
1749 sum
, lsah
->checksum
, inet_ntoa(lsah
->id
),
1750 inet_ntoa(nbr
->src
), inet_ntoa(nbr
->router_id
),
1751 inet_ntoa(lsah
->adv_router
));
1755 /* Examine the LSA's LS type. */
1756 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1757 flog_warn(EC_OSPF_PACKET
,
1758 "Link State Update: Unknown LS type %d",
1764 * What if the received LSA's age is greater than MaxAge?
1765 * Treat it as a MaxAge case -- endo.
1767 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1768 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1770 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1771 #ifdef STRICT_OBIT_USAGE_CHECK
1772 if ((IS_OPAQUE_LSA(lsah
->type
)
1773 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1774 || (!IS_OPAQUE_LSA(lsah
->type
)
1775 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1777 * This neighbor must know the exact usage of
1779 * the bit will be set in Type-9,10,11 LSAs
1782 flog_warn(EC_OSPF_PACKET
,
1783 "LSA[Type%d:%s]: O-bit abuse?",
1784 lsah
->type
, inet_ntoa(lsah
->id
));
1787 #endif /* STRICT_OBIT_USAGE_CHECK */
1789 /* Do not take in AS External Opaque-LSAs if we are a
1791 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1792 && nbr
->oi
->area
->external_routing
1793 != OSPF_AREA_DEFAULT
) {
1794 if (IS_DEBUG_OSPF_EVENT
)
1796 "LSA[Type%d:%s]: We are a stub, don't take this LSA.",
1798 inet_ntoa(lsah
->id
));
1801 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1802 flog_warn(EC_OSPF_PACKET
,
1803 "LSA[Type%d:%s]: Opaque capability mismatch?",
1804 lsah
->type
, inet_ntoa(lsah
->id
));
1808 /* Create OSPF LSA instance. */
1809 lsa
= ospf_lsa_new_and_data(length
);
1811 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1812 /* We may wish to put some error checking if type NSSA comes in
1813 and area not in NSSA mode */
1814 switch (lsah
->type
) {
1815 case OSPF_AS_EXTERNAL_LSA
:
1816 case OSPF_OPAQUE_AS_LSA
:
1819 case OSPF_OPAQUE_LINK_LSA
:
1820 lsa
->oi
= oi
; /* Remember incoming interface for
1821 flooding control. */
1824 lsa
->area
= oi
->area
;
1828 memcpy(lsa
->data
, lsah
, length
);
1830 if (IS_DEBUG_OSPF_EVENT
)
1832 "LSA[Type%d:%s]: %p new LSA created with Link State Update",
1833 lsa
->data
->type
, inet_ntoa(lsa
->data
->id
),
1835 listnode_add(lsas
, lsa
);
1841 /* Cleanup Update list. */
1842 static void ospf_upd_list_clean(struct list
*lsas
)
1844 struct listnode
*node
, *nnode
;
1845 struct ospf_lsa
*lsa
;
1847 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1848 ospf_lsa_discard(lsa
);
1853 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1854 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1855 struct ospf_header
*ospfh
, struct stream
*s
,
1856 struct ospf_interface
*oi
, uint16_t size
)
1858 struct ospf_neighbor
*nbr
;
1860 struct listnode
*node
, *nnode
;
1861 struct ospf_lsa
*lsa
= NULL
;
1862 /* unsigned long ls_req_found = 0; */
1864 /* Dis-assemble the stream, update each entry, re-encapsulate for
1867 /* Increment statistics. */
1870 /* Check neighbor. */
1871 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1873 flog_warn(EC_OSPF_PACKET
,
1874 "Link State Update: Unknown Neighbor %s on int: %s",
1875 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
1879 /* Add event to thread. */
1880 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1882 /* Check neighbor state. */
1883 if (nbr
->state
< NSM_Exchange
) {
1884 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1886 "Link State Update: "
1887 "Neighbor[%s] state %s is less than Exchange",
1888 inet_ntoa(ospfh
->router_id
),
1889 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1894 /* Get list of LSAs from Link State Update packet. - Also perorms Stages
1895 * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
1898 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1902 #define DISCARD_LSA(L, N) \
1904 if (IS_DEBUG_OSPF_EVENT) \
1906 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1908 N, (void *)lsa, (int)lsa->data->type); \
1909 ospf_lsa_discard(L); \
1913 /* Process each LSA received in the one packet.
1915 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1916 * text below are from the steps in RFC 2328, Section 13.
1918 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1919 struct ospf_lsa
*ls_ret
, *current
;
1922 if (IS_DEBUG_OSPF_NSSA
) {
1923 char buf1
[INET_ADDRSTRLEN
];
1924 char buf2
[INET_ADDRSTRLEN
];
1925 char buf3
[INET_ADDRSTRLEN
];
1927 zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s",
1929 inet_ntop(AF_INET
, &ospfh
->router_id
, buf1
,
1931 inet_ntop(AF_INET
, &lsa
->data
->id
, buf2
,
1933 inet_ntop(AF_INET
, &lsa
->data
->adv_router
,
1934 buf3
, INET_ADDRSTRLEN
));
1937 listnode_delete(lsas
,
1938 lsa
); /* We don't need it in list anymore */
1940 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1943 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1945 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1948 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1951 /* Do take in Type-7's if we are an NSSA */
1953 /* If we are also an ABR, later translate them to a Type-5
1956 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1957 translate them to a separate Type-5 packet. */
1959 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1960 /* Reject from STUB or NSSA */
1961 if (nbr
->oi
->area
->external_routing
1962 != OSPF_AREA_DEFAULT
) {
1963 if (IS_DEBUG_OSPF_NSSA
)
1965 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1966 DISCARD_LSA(lsa
, 1);
1969 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1970 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1971 if (IS_DEBUG_OSPF_NSSA
)
1973 "Incoming NSSA LSA Discarded: Not NSSA Area");
1974 DISCARD_LSA(lsa
, 2);
1977 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1978 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1979 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1980 &lsa
->data
->adv_router
)) {
1981 char buf1
[INET_ADDRSTRLEN
];
1982 char buf2
[INET_ADDRSTRLEN
];
1983 char buf3
[INET_ADDRSTRLEN
];
1985 flog_err(EC_OSPF_ROUTER_LSA_MISMATCH
,
1986 "Incoming Router-LSA from %s with "
1987 "Adv-ID[%s] != LS-ID[%s]",
1988 inet_ntop(AF_INET
, &ospfh
->router_id
,
1989 buf1
, INET_ADDRSTRLEN
),
1990 inet_ntop(AF_INET
, &lsa
->data
->id
,
1991 buf2
, INET_ADDRSTRLEN
),
1993 &lsa
->data
->adv_router
, buf3
,
1996 EC_OSPF_DOMAIN_CORRUPT
,
1997 "OSPF domain compromised by attack or corruption. "
1998 "Verify correct operation of -ALL- OSPF routers.");
1999 DISCARD_LSA(lsa
, 0);
2002 /* Find the LSA in the current database. */
2004 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
2006 /* (4) If the LSA's LS age is equal to MaxAge, and there is
2008 no instance of the LSA in the router's link state database,
2009 and none of router's neighbors are in states Exchange or
2011 then take the following actions: */
2013 if (IS_LSA_MAXAGE(lsa
) && !current
2014 && ospf_check_nbr_status(oi
->ospf
)) {
2015 /* (4a) Response Link State Acknowledgment. */
2016 ospf_ls_ack_send(nbr
, lsa
);
2018 /* (4b) Discard LSA. */
2019 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
2021 "Link State Update[%s]: LS age is equal to MaxAge.",
2024 DISCARD_LSA(lsa
, 3);
2027 if (IS_OPAQUE_LSA(lsa
->data
->type
)
2028 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
2029 &oi
->ospf
->router_id
)) {
2031 * Even if initial flushing seems to be completed, there
2033 * be a case that self-originated LSA with MaxAge still
2035 * in the routing domain.
2036 * Just send an LSAck message to cease retransmission.
2038 if (IS_LSA_MAXAGE(lsa
)) {
2039 zlog_info("LSA[%s]: Boomerang effect?",
2041 ospf_ls_ack_send(nbr
, lsa
);
2042 ospf_lsa_discard(lsa
);
2044 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2045 ospf_opaque_lsa_refresh_schedule(
2051 * If an instance of self-originated Opaque-LSA is not
2053 * in the LSDB, there are some possible cases here.
2055 * 1) This node lost opaque-capability after restart.
2056 * 2) Else, a part of opaque-type is no more supported.
2057 * 3) Else, a part of opaque-id is no more supported.
2059 * Anyway, it is still this node's responsibility to
2061 * Otherwise, the LSA instance remains in the routing
2063 * until its age reaches to MaxAge.
2065 /* XXX: We should deal with this for *ALL* LSAs, not
2067 if (current
== NULL
) {
2068 if (IS_DEBUG_OSPF_EVENT
)
2070 "LSA[%s]: Previously originated Opaque-LSA,"
2071 "not found in the LSDB.",
2074 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2076 ospf_opaque_self_originated_lsa_received(nbr
,
2078 ospf_ls_ack_send(nbr
, lsa
);
2084 /* It might be happen that received LSA is self-originated
2086 * router ID is changed. So, we should check if LSA is a
2088 * Link State ID is one of the router's own IP interface
2089 * addresses but whose
2090 * Advertising Router is not equal to the router's own Router ID
2091 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2095 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2096 struct listnode
*oinode
, *oinnode
;
2097 struct ospf_interface
*out_if
;
2100 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2105 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2107 && (!(IPV4_ADDR_SAME(
2108 &oi
->ospf
->router_id
,
2109 &lsa
->data
->adv_router
)))) {
2110 if (out_if
->network_lsa_self
) {
2111 ospf_lsa_flush_area(
2113 if (IS_DEBUG_OSPF_EVENT
)
2115 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2119 ospf_lsa_discard(lsa
);
2129 /* (5) Find the instance of this LSA that is currently contained
2130 in the router's link state database. If there is no
2131 database copy, or the received LSA is more recent than
2132 the database copy the following steps must be performed.
2133 (The sub steps from RFC 2328 section 13 step (5) will be
2138 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2140 if (current
&& (lsa
->data
->ls_seqnum
==
2141 htonl(OSPF_MAX_SEQUENCE_NUMBER
)
2142 && !IS_LSA_MAXAGE(lsa
))) {
2144 "Link State Update[%s]: has Max Seq but not MaxAge. Dropping it",
2147 DISCARD_LSA(lsa
, 4);
2150 /* Actual flooding procedure. */
2151 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2152 < 0) /* Trap NSSA later. */
2153 DISCARD_LSA(lsa
, 5);
2157 /* (6) Else, If there is an instance of the LSA on the sending
2158 neighbor's Link state request list, an error has occurred in
2159 the Database Exchange process. In this case, restart the
2160 Database Exchange process by generating the neighbor event
2161 BadLSReq for the sending neighbor and stop processing the
2162 Link State Update packet. */
2164 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2165 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2168 "LSA[%s] instance exists on Link state request list",
2171 /* Clean list of LSAs. */
2172 ospf_upd_list_clean(lsas
);
2173 /* this lsa is not on lsas list already. */
2174 ospf_lsa_discard(lsa
);
2178 /* If the received LSA is the same instance as the database copy
2179 (i.e., neither one is more recent) the following two steps
2180 should be performed: */
2183 /* If the LSA is listed in the Link state retransmission
2185 for the receiving adjacency, the router itself is
2187 an acknowledgment for this LSA. The router should
2189 received LSA as an acknowledgment by removing the LSA
2191 the Link state retransmission list. This is termed
2193 "implied acknowledgment". */
2195 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2197 if (ls_ret
!= NULL
) {
2198 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2200 /* Delayed acknowledgment sent if advertisement
2202 from Designated Router, otherwise do nothing.
2204 if (oi
->state
== ISM_Backup
)
2208 ospf_lsa_lock(lsa
));
2210 DISCARD_LSA(lsa
, 6);
2212 /* Acknowledge the receipt of the LSA by sending a
2213 Link State Acknowledgment packet back out the
2217 ospf_ls_ack_send(nbr
, lsa
);
2218 DISCARD_LSA(lsa
, 7);
2222 /* The database copy is more recent. If the database copy
2223 has LS age equal to MaxAge and LS sequence number equal to
2224 MaxSequenceNumber, simply discard the received LSA without
2225 acknowledging it. (In this case, the LSA's LS sequence number
2227 wrapping, and the MaxSequenceNumber LSA must be completely
2228 flushed before any new LSA instance can be introduced). */
2230 else if (ret
> 0) /* Database copy is more recent */
2232 if (IS_LSA_MAXAGE(current
)
2233 && current
->data
->ls_seqnum
2234 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2235 DISCARD_LSA(lsa
, 8);
2237 /* Otherwise, as long as the database copy has not been
2239 Link State Update within the last MinLSArrival
2241 database copy back to the sending neighbor,
2243 a Link State Update Packet. The Link State Update
2245 be sent directly to the neighbor. In so doing, do not
2247 database copy of the LSA on the neighbor's link state
2248 retransmission list, and do not acknowledge the
2250 recent) LSA instance. */
2252 if (monotime_since(¤t
->tv_orig
, NULL
)
2253 >= ospf
->min_ls_arrival
* 1000LL)
2254 /* Trap NSSA type later.*/
2255 ospf_ls_upd_send_lsa(
2257 OSPF_SEND_PACKET_DIRECT
);
2258 DISCARD_LSA(lsa
, 9);
2264 assert(listcount(lsas
) == 0);
2268 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2269 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2270 struct stream
*s
, struct ospf_interface
*oi
,
2273 struct ospf_neighbor
*nbr
;
2275 /* increment statistics. */
2278 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2280 flog_warn(EC_OSPF_PACKET
,
2281 "Link State Acknowledgment: Unknown Neighbor %s.",
2282 inet_ntoa(ospfh
->router_id
));
2286 /* Add event to thread. */
2287 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
2289 if (nbr
->state
< NSM_Exchange
) {
2290 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2292 "Link State Acknowledgment: "
2293 "Neighbor[%s] state %s is less than Exchange",
2294 inet_ntoa(ospfh
->router_id
),
2295 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2300 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2301 struct ospf_lsa
*lsa
, *lsr
;
2303 lsa
= ospf_lsa_new();
2304 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2305 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2307 /* lsah = (struct lsa_header *) stream_pnt (s); */
2308 size
-= OSPF_LSA_HEADER_SIZE
;
2309 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2311 if (lsa
->data
->type
< OSPF_MIN_LSA
2312 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2314 ospf_lsa_discard(lsa
);
2318 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2320 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0)
2321 ospf_ls_retransmit_delete(nbr
, lsr
);
2324 ospf_lsa_discard(lsa
);
2330 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2331 struct interface
**ifp
,
2332 struct stream
*ibuf
)
2337 ifindex_t ifindex
= 0;
2339 /* Header and data both require alignment. */
2340 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2343 memset(&msgh
, 0, sizeof(struct msghdr
));
2344 msgh
.msg_iov
= &iov
;
2345 msgh
.msg_iovlen
= 1;
2346 msgh
.msg_control
= (caddr_t
)buff
;
2347 msgh
.msg_controllen
= sizeof(buff
);
2349 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, 0, OSPF_MAX_PACKET_SIZE
+ 1);
2351 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2352 safe_strerror(errno
));
2355 if ((unsigned int)ret
< sizeof(iph
)) /* ret must be > 0 now */
2359 "ospf_recv_packet: discarding runt packet of length %d "
2360 "(ip header size is %u)",
2361 ret
, (unsigned int)sizeof(iph
));
2365 /* Note that there should not be alignment problems with this assignment
2366 because this is at the beginning of the stream data buffer. */
2367 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2368 sockopt_iphdrincl_swab_systoh(iph
);
2370 ip_len
= iph
->ip_len
;
2372 #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000)
2374 * Kernel network code touches incoming IP header parameters,
2375 * before protocol specific processing.
2377 * 1) Convert byteorder to host representation.
2378 * --> ip_len, ip_id, ip_off
2380 * 2) Adjust ip_len to strip IP header size!
2381 * --> If user process receives entire IP packet via RAW
2382 * socket, it must consider adding IP header size to
2383 * the "ip_len" field of "ip" structure.
2385 * For more details, see <netinet/ip_input.c>.
2387 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2390 #if defined(__DragonFly__)
2392 * in DragonFly's raw socket, ip_len/ip_off are read
2393 * in network byte order.
2394 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2396 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2399 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2401 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2403 if (ret
!= ip_len
) {
2406 "ospf_recv_packet read length mismatch: ip_len is %d, "
2407 "but recvmsg returned %d",
2415 static struct ospf_interface
*
2416 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2417 struct ip
*iph
, struct ospf_header
*ospfh
)
2419 struct ospf_interface
*rcv_oi
;
2420 struct ospf_vl_data
*vl_data
;
2421 struct ospf_area
*vl_area
;
2422 struct listnode
*node
;
2424 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2425 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2428 /* look for local OSPF interface matching the destination
2429 * to determine Area ID. We presume therefore the destination address
2430 * is unique, or at least (for "unnumbered" links), not used in other
2433 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2437 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2439 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2443 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2444 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2445 if (IS_DEBUG_OSPF_EVENT
)
2446 zlog_debug("associating packet with %s",
2447 IF_NAME(vl_data
->vl_oi
));
2448 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2449 if (IS_DEBUG_OSPF_EVENT
)
2451 "This VL is not up yet, sorry");
2455 return vl_data
->vl_oi
;
2459 if (IS_DEBUG_OSPF_EVENT
)
2460 zlog_debug("couldn't find any VL to associate the packet with");
2465 static int ospf_check_area_id(struct ospf_interface
*oi
,
2466 struct ospf_header
*ospfh
)
2468 /* Check match the Area ID of the receiving interface. */
2469 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2475 /* Unbound socket will accept any Raw IP packets if proto is matched.
2476 To prevent it, compare src IP address and i/f address with masking
2477 i/f network mask. */
2478 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2479 struct in_addr ip_src
)
2481 struct in_addr mask
, me
, him
;
2483 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2484 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2487 masklen2ip(oi
->address
->prefixlen
, &mask
);
2489 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2490 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2492 if (IPV4_ADDR_SAME(&me
, &him
))
2498 /* Return 1, if the packet is properly authenticated and checksummed,
2499 0 otherwise. In particular, check that AuType header field is valid and
2500 matches the locally configured AuType, and that D.5 requirements are met. */
2501 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2503 struct crypt_key
*ck
;
2504 uint16_t iface_auth_type
;
2505 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2507 switch (pkt_auth_type
) {
2508 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2509 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2510 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2513 "interface %s: auth-type mismatch, local %s, rcvd Null",
2515 lookup_msg(ospf_auth_type_str
,
2516 iface_auth_type
, NULL
));
2519 if (!ospf_check_sum(ospfh
)) {
2520 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2523 "interface %s: Null auth OK, but checksum error, Router-ID %s",
2525 inet_ntoa(ospfh
->router_id
));
2529 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2530 if (OSPF_AUTH_SIMPLE
2531 != (iface_auth_type
= ospf_auth_type(oi
))) {
2532 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2535 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2537 lookup_msg(ospf_auth_type_str
,
2538 iface_auth_type
, NULL
));
2541 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2542 OSPF_AUTH_SIMPLE_SIZE
)) {
2543 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2544 flog_warn(EC_OSPF_PACKET
,
2545 "interface %s: Simple auth failed",
2549 if (!ospf_check_sum(ospfh
)) {
2550 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2553 "interface %s: Simple auth OK, checksum error, Router-ID %s",
2555 inet_ntoa(ospfh
->router_id
));
2559 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2560 if (OSPF_AUTH_CRYPTOGRAPHIC
2561 != (iface_auth_type
= ospf_auth_type(oi
))) {
2562 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2565 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2567 lookup_msg(ospf_auth_type_str
,
2568 iface_auth_type
, NULL
));
2571 if (ospfh
->checksum
) {
2572 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2575 "interface %s: OSPF header checksum is not 0",
2579 /* only MD5 crypto method can pass ospf_packet_examin() */
2580 if (NULL
== (ck
= listgetdata(
2581 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2582 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2583 /* Condition above uses the last key ID on the list,
2585 different from what ospf_crypt_key_lookup() does. A
2587 !ospf_check_md5_digest(oi
, ospfh
)) {
2588 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2589 flog_warn(EC_OSPF_MD5
,
2590 "interface %s: MD5 auth failed",
2596 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2599 "interface %s: invalid packet auth-type (%02x)",
2600 IF_NAME(oi
), pkt_auth_type
);
2605 static int ospf_check_sum(struct ospf_header
*ospfh
)
2610 /* clear auth_data for checksum. */
2611 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2613 /* keep checksum and clear. */
2614 sum
= ospfh
->checksum
;
2615 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2617 /* calculate checksum. */
2618 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2621 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2629 /* Verify, that given link/TOS records are properly sized/aligned and match
2630 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2631 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2633 const uint16_t num_links
)
2635 unsigned counted_links
= 0, thislinklen
;
2639 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2640 if (thislinklen
> linkbytes
) {
2641 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2642 zlog_debug("%s: length error in link block #%u",
2643 __func__
, counted_links
);
2646 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2647 linkbytes
-= thislinklen
;
2650 if (counted_links
!= num_links
) {
2651 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2652 zlog_debug("%s: %u link blocks declared, %u present",
2653 __func__
, num_links
, counted_links
);
2659 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2660 minimum length constraint). */
2661 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2662 const uint8_t headeronly
)
2665 struct router_lsa
*rlsa
;
2666 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2667 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2668 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2669 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2670 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2674 switch (lsah
->type
) {
2675 case OSPF_ROUTER_LSA
:
2676 /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1
2677 * (12+)-byte link blocks */
2679 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2680 - OSPF_ROUTER_LSA_MIN_SIZE
)
2686 rlsa
= (struct router_lsa
*)lsah
;
2687 ret
= ospf_router_lsa_links_examin(
2688 (struct router_lsa_link
*)rlsa
->link
,
2689 lsalen
- OSPF_LSA_HEADER_SIZE
- 4, /* skip: basic
2692 ntohs(rlsa
->links
) /* 16 bits */
2695 case OSPF_AS_EXTERNAL_LSA
:
2696 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2698 case OSPF_AS_NSSA_LSA
:
2699 /* RFC3101 C, idem */
2700 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2701 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2706 /* Following LSA types are considered OK length-wise as soon as their
2708 * length constraint is met and length of the whole LSA is a multiple of
2710 * (basic LSA header size is already a multiple of 4). */
2711 case OSPF_NETWORK_LSA
:
2712 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2713 case OSPF_SUMMARY_LSA
:
2714 case OSPF_ASBR_SUMMARY_LSA
:
2715 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2717 case OSPF_OPAQUE_LINK_LSA
:
2718 case OSPF_OPAQUE_AREA_LSA
:
2719 case OSPF_OPAQUE_AS_LSA
:
2720 /* RFC5250 A.2, "some number of octets (of application-specific
2721 * data) padded to 32-bit alignment." This is considered
2723 * to 4-byte alignment of all other LSA types, see
2724 * OSPF-ALIGNMENT.txt
2725 * file for the detailed analysis of this passage. */
2726 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2729 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2730 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2734 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2735 zlog_debug("%s: alignment error in %s", __func__
,
2736 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2740 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2741 includes verification of LSA blocks length/alignment and dispatching
2742 of deeper-level checks. */
2744 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2745 size_t length
, const uint8_t headeronly
,
2746 /* When declared_num_lsas is not 0, compare it to the real
2748 and treat the difference as an error. */
2749 const uint32_t declared_num_lsas
)
2751 uint32_t counted_lsas
= 0;
2755 if (length
< OSPF_LSA_HEADER_SIZE
) {
2756 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2758 "%s: undersized (%zu B) trailing (#%u) LSA header",
2759 __func__
, length
, counted_lsas
);
2762 /* save on ntohs() calls here and in the LSA validator */
2763 lsalen
= ntohs(lsah
->length
);
2764 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2765 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2767 "%s: malformed LSA header #%u, declared length is %u B",
2768 __func__
, counted_lsas
, lsalen
);
2772 /* less checks here and in ospf_lsa_examin() */
2773 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2774 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2776 "%s: malformed header-only LSA #%u",
2777 __func__
, counted_lsas
);
2780 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2781 + OSPF_LSA_HEADER_SIZE
);
2782 length
-= OSPF_LSA_HEADER_SIZE
;
2784 /* make sure the input buffer is deep enough before
2786 if (lsalen
> length
) {
2787 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2789 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2790 __func__
, counted_lsas
, lsalen
,
2794 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2795 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2796 zlog_debug("%s: malformed LSA #%u",
2797 __func__
, counted_lsas
);
2800 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2806 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2807 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2809 "%s: #LSAs declared (%u) does not match actual (%u)",
2810 __func__
, declared_num_lsas
, counted_lsas
);
2816 /* Verify a complete OSPF packet for proper sizing/alignment. */
2817 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2818 const unsigned bytesonwire
)
2820 uint16_t bytesdeclared
, bytesauth
;
2822 struct ospf_ls_update
*lsupd
;
2824 /* Length, 1st approximation. */
2825 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2826 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2827 zlog_debug("%s: undersized (%u B) packet", __func__
,
2831 /* Now it is safe to access header fields. Performing length check,
2833 * for possible extra bytes of crypto auth/padding, which are not
2835 * in the OSPF header "length" field. */
2836 if (oh
->version
!= OSPF_VERSION
) {
2837 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2838 zlog_debug("%s: invalid (%u) protocol version",
2839 __func__
, oh
->version
);
2842 bytesdeclared
= ntohs(oh
->length
);
2843 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2846 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2847 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2849 "%s: unsupported crypto auth length (%u B)",
2850 __func__
, oh
->u
.crypt
.auth_data_len
);
2853 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2855 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2856 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2858 "%s: packet length error (%u real, %u+%u declared)",
2859 __func__
, bytesonwire
, bytesdeclared
,
2863 /* Length, 2nd approximation. The type-specific constraint is checked
2864 against declared length, not amount of bytes on wire. */
2865 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2867 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2868 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2869 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2871 lookup_msg(ospf_packet_type_str
, oh
->type
,
2876 case OSPF_MSG_HELLO
:
2877 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2879 by N>=0 router-IDs. */
2880 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2885 case OSPF_MSG_DB_DESC
:
2886 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2888 by N>=0 header-only LSAs. */
2889 ret
= ospf_lsaseq_examin(
2890 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2891 + OSPF_DB_DESC_MIN_SIZE
),
2892 bytesdeclared
- OSPF_HEADER_SIZE
2893 - OSPF_DB_DESC_MIN_SIZE
,
2894 1, /* header-only LSAs */
2897 case OSPF_MSG_LS_REQ
:
2898 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2899 * request blocks. */
2900 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2905 case OSPF_MSG_LS_UPD
:
2906 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2908 by N>=0 full LSAs (with N declared beforehand). */
2909 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2910 + OSPF_HEADER_SIZE
);
2911 ret
= ospf_lsaseq_examin(
2912 (struct lsa_header
*)((caddr_t
)lsupd
2913 + OSPF_LS_UPD_MIN_SIZE
),
2914 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2916 ntohl(lsupd
->num_lsas
) /* 32 bits */
2919 case OSPF_MSG_LS_ACK
:
2920 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2922 ret
= ospf_lsaseq_examin(
2923 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2924 + OSPF_LS_ACK_MIN_SIZE
),
2925 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2926 1, /* header-only LSAs */
2930 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2931 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2935 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2936 zlog_debug("%s: malformed %s packet", __func__
,
2937 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2941 /* OSPF Header verification. */
2942 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2943 struct ip
*iph
, struct ospf_header
*ospfh
)
2945 /* Check Area ID. */
2946 if (!ospf_check_area_id(oi
, ospfh
)) {
2947 flog_warn(EC_OSPF_PACKET
,
2948 "interface %s: ospf_read invalid Area ID %s.",
2949 IF_NAME(oi
), inet_ntoa(ospfh
->area_id
));
2953 /* Check network mask, Silently discarded. */
2954 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2957 "interface %s: ospf_read network address is not same [%s]",
2958 IF_NAME(oi
), inet_ntoa(iph
->ip_src
));
2962 /* Check authentication. The function handles logging actions, where
2964 if (!ospf_check_auth(oi
, ospfh
))
2970 /* Starting point of packet process function. */
2971 int ospf_read(struct thread
*thread
)
2974 struct stream
*ibuf
;
2976 struct ospf_interface
*oi
;
2978 struct ospf_header
*ospfh
;
2980 struct interface
*ifp
= NULL
;
2981 struct connected
*c
;
2983 /* first of all get interface pointer. */
2984 ospf
= THREAD_ARG(thread
);
2986 /* prepare for next packet. */
2987 ospf
->t_read
= NULL
;
2988 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
2990 stream_reset(ospf
->ibuf
);
2991 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2994 /* This raw packet is known to be at least as big as its IP header. */
2996 /* Note that there should not be alignment problems with this assignment
2997 because this is at the beginning of the stream data buffer. */
2998 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2999 /* Note that sockopt_iphdrincl_swab_systoh was called in
3000 * ospf_recv_packet. */
3003 /* Handle cases where the platform does not support retrieving
3005 and also platforms (such as Solaris 8) that claim to support
3007 retrieval but do not. */
3008 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
3016 /* IP Header dump. */
3017 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3018 ospf_ip_header_dump(iph
);
3020 /* Self-originated packet should be discarded silently. */
3021 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
3022 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
3024 "ospf_read[%s]: Dropping self-originated packet",
3025 inet_ntoa(iph
->ip_src
));
3030 /* Advance from IP header to OSPF header (iph->ip_hl has been verified
3031 by ospf_recv_packet() to be correct). */
3032 stream_forward_getp(ibuf
, iph
->ip_hl
* 4);
3034 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3036 != ospf_packet_examin(
3037 ospfh
, stream_get_endp(ibuf
) - stream_get_getp(ibuf
)))
3039 /* Now it is safe to access all fields of OSPF packet header. */
3041 /* associate packet with ospf interface */
3042 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3044 /* ospf_verify_header() relies on a valid "oi" and thus can be called
3046 after the passive/backbone/other checks below are passed. These
3048 in turn access the fields of unverified "ospfh" structure for their
3050 purposes and must remain very accurate in doing this. */
3052 /* If incoming interface is passive one, ignore it. */
3053 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3054 char buf
[3][INET_ADDRSTRLEN
];
3056 if (IS_DEBUG_OSPF_EVENT
)
3058 "ignoring packet from router %s sent to %s, "
3059 "received on a passive interface, %s",
3060 inet_ntop(AF_INET
, &ospfh
->router_id
, buf
[0],
3062 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3064 inet_ntop(AF_INET
, &oi
->address
->u
.prefix4
,
3065 buf
[2], sizeof(buf
[2])));
3067 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3068 /* Try to fix multicast membership.
3069 * Some OS:es may have problems in this area,
3070 * make sure it is removed.
3072 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3073 ospf_if_set_multicast(oi
);
3079 /* if no local ospf_interface,
3080 * or header area is backbone but ospf_interface is not
3081 * check for VLINK interface
3083 if ((oi
== NULL
) || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3084 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3085 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3087 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3089 "Packet from [%s] received on link %s"
3090 " but no ospf_interface",
3091 inet_ntoa(iph
->ip_src
), ifp
->name
);
3096 /* else it must be a local ospf interface, check it was received on
3099 else if (oi
->ifp
!= ifp
) {
3100 if (IS_DEBUG_OSPF_EVENT
)
3101 flog_warn(EC_OSPF_PACKET
,
3102 "Packet from [%s] received on wrong link %s",
3103 inet_ntoa(iph
->ip_src
), ifp
->name
);
3105 } else if (oi
->state
== ISM_Down
) {
3106 char buf
[2][INET_ADDRSTRLEN
];
3109 "Ignoring packet from %s to %s received on interface that is "
3110 "down [%s]; interface flags are %s",
3111 inet_ntop(AF_INET
, &iph
->ip_src
, buf
[0],
3113 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3115 ifp
->name
, if_flag_dump(ifp
->flags
));
3116 /* Fix multicast memberships? */
3117 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3118 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3119 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3120 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3121 if (oi
->multicast_memberships
)
3122 ospf_if_set_multicast(oi
);
3127 * If the received packet is destined for AllDRouters, the packet
3128 * should be accepted only if the received ospf interface state is
3129 * either DR or Backup -- endo.
3131 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3132 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3135 "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)",
3136 inet_ntoa(iph
->ip_src
), IF_NAME(oi
),
3137 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3138 /* Try to fix multicast membership. */
3139 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3140 ospf_if_set_multicast(oi
);
3144 /* Verify more OSPF header fields. */
3145 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3147 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3149 "ospf_read[%s]: Header check failed, "
3151 inet_ntoa(iph
->ip_src
));
3155 /* Show debug receiving packet. */
3156 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3157 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3159 "-----------------------------------------------------");
3160 ospf_packet_dump(ibuf
);
3163 zlog_debug("%s received from [%s] via [%s]",
3164 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3165 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
3166 zlog_debug(" src [%s],", inet_ntoa(iph
->ip_src
));
3167 zlog_debug(" dst [%s]", inet_ntoa(iph
->ip_dst
));
3169 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3171 "-----------------------------------------------------");
3174 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3176 /* Adjust size to message length. */
3177 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3179 /* Read rest of the packet and call each sort of packet routine. */
3180 switch (ospfh
->type
) {
3181 case OSPF_MSG_HELLO
:
3182 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3184 case OSPF_MSG_DB_DESC
:
3185 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3187 case OSPF_MSG_LS_REQ
:
3188 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3190 case OSPF_MSG_LS_UPD
:
3191 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3193 case OSPF_MSG_LS_ACK
:
3194 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3197 flog_warn(EC_OSPF_PACKET
,
3198 "interface %s: OSPF packet header type %d is illegal",
3199 IF_NAME(oi
), ospfh
->type
);
3206 /* Make OSPF header. */
3207 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3210 struct ospf_header
*ospfh
;
3212 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3214 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3215 ospfh
->type
= (uint8_t)type
;
3217 ospfh
->router_id
= oi
->ospf
->router_id
;
3219 ospfh
->checksum
= 0;
3220 ospfh
->area_id
= oi
->area
->area_id
;
3221 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3223 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3225 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3228 /* Make Authentication Data. */
3229 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3231 struct crypt_key
*ck
;
3233 switch (ospf_auth_type(oi
)) {
3234 case OSPF_AUTH_NULL
:
3235 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3238 case OSPF_AUTH_SIMPLE
:
3239 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3240 OSPF_AUTH_SIMPLE_SIZE
);
3242 case OSPF_AUTH_CRYPTOGRAPHIC
:
3243 /* If key is not set, then set 0. */
3244 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3245 ospfh
->u
.crypt
.zero
= 0;
3246 ospfh
->u
.crypt
.key_id
= 0;
3247 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3250 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3251 ospfh
->u
.crypt
.zero
= 0;
3252 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3253 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3255 /* note: the seq is done in ospf_make_md5_digest() */
3258 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3266 /* Fill rest of OSPF header. */
3267 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3270 struct ospf_header
*ospfh
;
3272 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3275 ospfh
->length
= htons(length
);
3277 /* Calculate checksum. */
3278 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3279 ospfh
->checksum
= in_cksum(ospfh
, length
);
3281 ospfh
->checksum
= 0;
3283 /* Add Authentication Data. */
3284 ospf_make_auth(oi
, ospfh
);
3287 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3289 struct ospf_neighbor
*nbr
;
3290 struct route_node
*rn
;
3291 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3292 struct in_addr mask
;
3296 /* Set netmask of interface. */
3297 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3298 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3299 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3300 masklen2ip(oi
->address
->prefixlen
, &mask
);
3302 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3303 stream_put_ipv4(s
, mask
.s_addr
);
3305 /* Set Hello Interval. */
3306 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3307 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3309 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3311 if (IS_DEBUG_OSPF_EVENT
)
3312 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3316 stream_putc(s
, OPTIONS(oi
));
3318 /* Set Router Priority. */
3319 stream_putc(s
, PRIORITY(oi
));
3321 /* Set Router Dead Interval. */
3322 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3324 /* Set Designated Router. */
3325 stream_put_ipv4(s
, DR(oi
).s_addr
);
3327 p
= stream_get_endp(s
);
3329 /* Set Backup Designated Router. */
3330 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3332 /* Add neighbor seen. */
3333 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3334 if ((nbr
= rn
->info
))
3335 if (nbr
->router_id
.s_addr
3336 != 0) /* Ignore 0.0.0.0 node. */
3338 != NSM_Attempt
) /* Ignore Down neighbor. */
3340 != NSM_Down
) /* This is myself for
3342 if (!IPV4_ADDR_SAME(
3344 &oi
->ospf
->router_id
)) {
3345 /* Check neighbor is
3347 if (nbr
->d_router
.s_addr
3361 /* Hello packet overflows interface MTU. */
3362 if (length
+ sizeof(uint32_t)
3363 > ospf_packet_max(oi
)) {
3365 EC_OSPF_LARGE_HELLO
,
3366 "Oversized Hello packet! Larger than MTU. Not sending it out");
3377 /* Let neighbor generate BackupSeen. */
3379 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3384 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3385 struct ospf_neighbor
*nbr
, struct stream
*s
)
3387 struct ospf_lsa
*lsa
;
3388 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3392 struct ospf_lsdb
*lsdb
;
3394 /* Set Interface MTU. */
3395 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3398 stream_putw(s
, oi
->ifp
->mtu
);
3401 options
= OPTIONS(oi
);
3402 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3403 SET_FLAG(options
, OSPF_OPTION_O
);
3404 stream_putc(s
, options
);
3407 pp
= stream_get_endp(s
);
3408 stream_putc(s
, nbr
->dd_flags
);
3410 /* Set DD Sequence Number. */
3411 stream_putl(s
, nbr
->dd_seqnum
);
3413 /* shortcut unneeded walk of (empty) summary LSDBs */
3414 if (ospf_db_summary_isempty(nbr
))
3417 /* Describe LSA Header from Database Summary List. */
3418 lsdb
= &nbr
->db_sum
;
3420 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3421 struct route_table
*table
= lsdb
->type
[i
].db
;
3422 struct route_node
*rn
;
3424 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3425 if ((lsa
= rn
->info
) != NULL
) {
3426 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3427 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3428 /* Suppress advertising
3429 * opaque-information. */
3430 /* Remove LSA from DB summary list. */
3431 ospf_lsdb_delete(lsdb
, lsa
);
3435 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3436 struct lsa_header
*lsah
;
3439 /* DD packet overflows interface MTU. */
3440 if (length
+ OSPF_LSA_HEADER_SIZE
3441 > ospf_packet_max(oi
))
3444 /* Keep pointer to LS age. */
3445 lsah
= (struct lsa_header
3450 /* Proceed stream pointer. */
3451 stream_put(s
, lsa
->data
,
3452 OSPF_LSA_HEADER_SIZE
);
3453 length
+= OSPF_LSA_HEADER_SIZE
;
3456 ls_age
= LS_AGE(lsa
);
3457 lsah
->ls_age
= htons(ls_age
);
3460 /* Remove LSA from DB summary list. */
3461 ospf_lsdb_delete(lsdb
, lsa
);
3465 /* Update 'More' bit */
3466 if (ospf_db_summary_isempty(nbr
)) {
3468 if (nbr
->state
>= NSM_Exchange
) {
3469 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3470 /* Rewrite DD flags */
3471 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3473 assert(IS_SET_DD_M(nbr
->dd_flags
));
3479 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3480 unsigned long delta
, struct ospf_neighbor
*nbr
,
3481 struct ospf_lsa
*lsa
)
3483 struct ospf_interface
*oi
;
3487 /* LS Request packet overflows interface MTU
3488 * delta is just number of bytes required for 1 LS Req
3489 * ospf_packet_max will return the number of bytes can
3490 * be accomodated without ospf header. So length+delta
3491 * can be compared to ospf_packet_max
3492 * to check if it can fit another lsreq in the same packet.
3495 if (*length
+ delta
> ospf_packet_max(oi
))
3498 stream_putl(s
, lsa
->data
->type
);
3499 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3500 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3502 ospf_lsa_unlock(&nbr
->ls_req_last
);
3503 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3509 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3511 struct ospf_lsa
*lsa
;
3512 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3513 unsigned long delta
= 12;
3514 struct route_table
*table
;
3515 struct route_node
*rn
;
3517 struct ospf_lsdb
*lsdb
;
3519 lsdb
= &nbr
->ls_req
;
3521 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3522 table
= lsdb
->type
[i
].db
;
3523 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3524 if ((lsa
= (rn
->info
)) != NULL
)
3525 if (ospf_make_ls_req_func(s
, &length
, delta
,
3528 route_unlock_node(rn
);
3535 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3539 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3541 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3544 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3547 struct ospf_lsa
*lsa
;
3548 struct listnode
*node
;
3549 uint16_t length
= 0;
3550 unsigned int size_noauth
;
3551 unsigned long delta
= stream_get_endp(s
);
3555 if (IS_DEBUG_OSPF_EVENT
)
3556 zlog_debug("ospf_make_ls_upd: Start");
3558 pp
= stream_get_endp(s
);
3559 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3560 length
+= OSPF_LS_UPD_MIN_SIZE
;
3562 /* Calculate amount of packet usable for data. */
3563 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3565 while ((node
= listhead(update
)) != NULL
) {
3566 struct lsa_header
*lsah
;
3569 if (IS_DEBUG_OSPF_EVENT
)
3570 zlog_debug("ospf_make_ls_upd: List Iteration %d",
3573 lsa
= listgetdata(node
);
3577 /* Will it fit? Minimum it has to fit atleast one */
3578 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3582 /* Keep pointer to LS age. */
3583 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3584 + stream_get_endp(s
));
3586 /* Put LSA to Link State Request. */
3587 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3590 /* each hop must increment an lsa_age by transmit_delay
3591 of OSPF interface */
3592 ls_age
= ls_age_increment(lsa
,
3593 OSPF_IF_PARAM(oi
, transmit_delay
));
3594 lsah
->ls_age
= htons(ls_age
);
3596 length
+= ntohs(lsa
->data
->length
);
3599 list_delete_node(update
, node
);
3600 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3603 /* Now set #LSAs. */
3604 stream_putl_at(s
, pp
, count
);
3606 if (IS_DEBUG_OSPF_EVENT
)
3607 zlog_debug("ospf_make_ls_upd: Stop");
3611 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3614 struct listnode
*node
, *nnode
;
3615 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3616 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3617 struct ospf_lsa
*lsa
;
3619 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3622 /* LS Ack packet overflows interface MTU
3623 * delta is just number of bytes required for
3624 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3625 * the number of bytes can be accomodated without
3626 * ospf header. So length+delta can be compared
3627 * against ospf_packet_max to check if it can fit
3628 * another ls header in the same packet.
3630 if ((length
+ delta
) > ospf_packet_max(oi
))
3633 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3634 length
+= OSPF_LSA_HEADER_SIZE
;
3636 listnode_delete(ack
, lsa
);
3637 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3643 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3645 struct ospf_packet
*op
;
3646 uint16_t length
= OSPF_HEADER_SIZE
;
3648 op
= ospf_packet_new(oi
->ifp
->mtu
);
3650 /* Prepare OSPF common header. */
3651 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3653 /* Prepare OSPF Hello body. */
3654 length
+= ospf_make_hello(oi
, op
->s
);
3655 if (length
== OSPF_HEADER_SIZE
) {
3656 /* Hello overshooting MTU */
3657 ospf_packet_free(op
);
3661 /* Fill OSPF header. */
3662 ospf_fill_header(oi
, op
->s
, length
);
3664 /* Set packet length. */
3665 op
->length
= length
;
3667 op
->dst
.s_addr
= addr
;
3669 if (IS_DEBUG_OSPF_EVENT
) {
3670 if (oi
->ospf
->vrf_id
)
3672 "%s: Hello Tx interface %s ospf vrf %s id %u",
3673 __PRETTY_FUNCTION__
, oi
->ifp
->name
,
3674 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3677 /* Add packet to the top of the interface output queue, so that they
3678 * can't get delayed by things like long queues of LS Update packets
3680 ospf_packet_add_top(oi
, op
);
3682 /* Hook thread to write packet. */
3683 OSPF_ISM_WRITE_ON(oi
->ospf
);
3686 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3688 struct ospf_interface
*oi
;
3693 /* If this is passive interface, do not send OSPF Hello. */
3694 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3697 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3700 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3703 if (PRIORITY(oi
) == 0)
3706 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3707 && oi
->state
!= ISM_Backup
)
3710 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3713 int ospf_poll_timer(struct thread
*thread
)
3715 struct ospf_nbr_nbma
*nbr_nbma
;
3717 nbr_nbma
= THREAD_ARG(thread
);
3718 nbr_nbma
->t_poll
= NULL
;
3720 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3721 zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)",
3722 IF_NAME(nbr_nbma
->oi
), inet_ntoa(nbr_nbma
->addr
));
3724 ospf_poll_send(nbr_nbma
);
3726 if (nbr_nbma
->v_poll
> 0)
3727 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3734 int ospf_hello_reply_timer(struct thread
*thread
)
3736 struct ospf_neighbor
*nbr
;
3738 nbr
= THREAD_ARG(thread
);
3739 nbr
->t_hello_reply
= NULL
;
3743 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3744 zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)",
3745 IF_NAME(nbr
->oi
), inet_ntoa(nbr
->router_id
));
3747 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3752 /* Send OSPF Hello. */
3753 void ospf_hello_send(struct ospf_interface
*oi
)
3755 /* If this is passive interface, do not send OSPF Hello. */
3756 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3759 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3760 struct ospf_neighbor
*nbr
;
3761 struct route_node
*rn
;
3763 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3764 if ((nbr
= rn
->info
))
3765 if (nbr
!= oi
->nbr_self
)
3766 if (nbr
->state
!= NSM_Down
) {
3767 /* RFC 2328 Section 9.5.1
3768 If the router is not
3769 eligible to become Designated
3771 it must periodically send
3772 Hello Packets to both the
3773 Designated Router and the
3774 Backup Designated Router (if
3777 if (PRIORITY(oi
) == 0
3788 /* If the router is eligible to
3789 become Designated Router, it
3790 must periodically send Hello
3791 Packets to all neighbors that
3792 are also eligible. In
3793 addition, if the router is
3795 Designated Router or Backup
3796 Designated Router, it must
3798 send periodic Hello Packets
3799 to all other neighbors. */
3801 if (nbr
->priority
== 0
3802 && oi
->state
== ISM_DROther
)
3804 /* if oi->state == Waiting, send
3805 * hello to all neighbors */
3806 ospf_hello_send_sub(
3808 nbr
->address
.u
.prefix4
3812 /* Decide destination address. */
3813 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3814 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3816 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3820 /* Send OSPF Database Description. */
3821 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3823 struct ospf_interface
*oi
;
3824 struct ospf_packet
*op
;
3825 uint16_t length
= OSPF_HEADER_SIZE
;
3828 op
= ospf_packet_new(oi
->ifp
->mtu
);
3830 /* Prepare OSPF common header. */
3831 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3833 /* Prepare OSPF Database Description body. */
3834 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3836 /* Fill OSPF header. */
3837 ospf_fill_header(oi
, op
->s
, length
);
3839 /* Set packet length. */
3840 op
->length
= length
;
3842 /* Decide destination address. */
3843 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3844 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3846 op
->dst
= nbr
->address
.u
.prefix4
;
3848 /* Add packet to the interface output queue. */
3849 ospf_packet_add(oi
, op
);
3851 /* Hook thread to write packet. */
3852 OSPF_ISM_WRITE_ON(oi
->ospf
);
3854 /* Remove old DD packet, then copy new one and keep in neighbor
3857 ospf_packet_free(nbr
->last_send
);
3858 nbr
->last_send
= ospf_packet_dup(op
);
3859 monotime(&nbr
->last_send_ts
);
3862 /* Re-send Database Description. */
3863 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3865 struct ospf_interface
*oi
;
3869 /* Add packet to the interface output queue. */
3870 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3872 /* Hook thread to write packet. */
3873 OSPF_ISM_WRITE_ON(oi
->ospf
);
3876 /* Send Link State Request. */
3877 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3879 struct ospf_interface
*oi
;
3880 struct ospf_packet
*op
;
3881 uint16_t length
= OSPF_HEADER_SIZE
;
3884 op
= ospf_packet_new(oi
->ifp
->mtu
);
3886 /* Prepare OSPF common header. */
3887 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3889 /* Prepare OSPF Link State Request body. */
3890 length
+= ospf_make_ls_req(nbr
, op
->s
);
3891 if (length
== OSPF_HEADER_SIZE
) {
3892 ospf_packet_free(op
);
3896 /* Fill OSPF header. */
3897 ospf_fill_header(oi
, op
->s
, length
);
3899 /* Set packet length. */
3900 op
->length
= length
;
3902 /* Decide destination address. */
3903 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3904 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3906 op
->dst
= nbr
->address
.u
.prefix4
;
3908 /* Add packet to the interface output queue. */
3909 ospf_packet_add(oi
, op
);
3911 /* Hook thread to write packet. */
3912 OSPF_ISM_WRITE_ON(oi
->ospf
);
3914 /* Add Link State Request Retransmission Timer. */
3915 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3918 /* Send Link State Update with an LSA. */
3919 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3922 struct list
*update
;
3924 update
= list_new();
3926 listnode_add(update
, lsa
);
3928 /*ospf instance is going down, send self originated
3929 * MAXAGE LSA update to neighbors to remove from LSDB */
3930 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3931 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3933 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3935 list_delete(&update
);
3938 /* Determine size for packet. Must be at least big enough to accomodate next
3939 * LSA on list, which may be bigger than MTU size.
3941 * Return pointer to new ospf_packet
3942 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3943 * on packet sizes (in which case offending LSA is deleted from update list)
3945 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3946 struct ospf_interface
*oi
)
3948 struct ospf_lsa
*lsa
;
3949 struct listnode
*ln
;
3951 static char warned
= 0;
3953 lsa
= listgetdata((ln
= listhead(update
)));
3956 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3957 > ospf_packet_max(oi
)) {
3961 "ospf_ls_upd_packet_new: oversized LSA encountered!"
3962 "will need to fragment. Not optimal. Try divide up"
3963 " your network with areas. Use 'debug ospf packet send'"
3964 " to see details, or look at 'show ip ospf database ..'");
3968 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3970 "ospf_ls_upd_packet_new: oversized LSA id:%s,"
3971 " %d bytes originated by %s, will be fragmented!",
3972 inet_ntoa(lsa
->data
->id
),
3973 ntohs(lsa
->data
->length
),
3974 inet_ntoa(lsa
->data
->adv_router
));
3977 * Allocate just enough to fit this LSA only, to avoid including
3979 * LSAs in fragmented LSA Updates.
3981 size
= ntohs(lsa
->data
->length
)
3982 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
3983 + OSPF_LS_UPD_MIN_SIZE
;
3985 size
= oi
->ifp
->mtu
;
3987 if (size
> OSPF_MAX_PACKET_SIZE
) {
3988 flog_warn(EC_OSPF_LARGE_LSA
,
3989 "ospf_ls_upd_packet_new: oversized LSA id:%s too big,"
3990 " %d bytes, packet size %ld, dropping it completely."
3991 " OSPF routing is broken!",
3992 inet_ntoa(lsa
->data
->id
), ntohs(lsa
->data
->length
),
3994 list_delete_node(update
, ln
);
3998 /* IP header is built up separately by ospf_write(). This means, that we
4000 * reduce the "affordable" size just calculated by length of an IP
4002 * This makes sure, that even if we manage to fill the payload with LSA
4004 * completely, the final packet (our data plus IP header) still fits
4006 * outgoing interface MTU. This correction isn't really meaningful for
4008 * oversized LSA, but for consistency the correction is done for both
4011 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
4013 return ospf_packet_new(size
- sizeof(struct ip
));
4016 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
4017 struct list
*update
, struct in_addr addr
,
4020 struct ospf_packet
*op
;
4021 uint16_t length
= OSPF_HEADER_SIZE
;
4023 if (IS_DEBUG_OSPF_EVENT
)
4024 zlog_debug("listcount = %d, [%s]dst %s", listcount(update
),
4025 IF_NAME(oi
), inet_ntoa(addr
));
4027 /* Check that we have really something to process */
4028 if (listcount(update
) == 0)
4031 op
= ospf_ls_upd_packet_new(update
, oi
);
4033 /* Prepare OSPF common header. */
4034 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4036 /* Prepare OSPF Link State Update body.
4037 * Includes Type-7 translation.
4039 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4041 /* Fill OSPF header. */
4042 ospf_fill_header(oi
, op
->s
, length
);
4044 /* Set packet length. */
4045 op
->length
= length
;
4047 /* Decide destination address. */
4048 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4049 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4051 op
->dst
.s_addr
= addr
.s_addr
;
4053 /* Add packet to the interface output queue. */
4054 ospf_packet_add(oi
, op
);
4055 /* Call ospf_write() right away to send ospf packets to neighbors */
4056 if (send_lsupd_now
) {
4057 struct thread os_packet_thd
;
4059 os_packet_thd
.arg
= (void *)oi
->ospf
;
4060 if (oi
->on_write_q
== 0) {
4061 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4064 ospf_write(&os_packet_thd
);
4066 /* Hook thread to write packet. */
4067 OSPF_ISM_WRITE_ON(oi
->ospf
);
4071 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
4073 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4074 struct route_node
*rn
;
4075 struct route_node
*rnext
;
4076 struct list
*update
;
4079 oi
->t_ls_upd_event
= NULL
;
4081 if (IS_DEBUG_OSPF_EVENT
)
4082 zlog_debug("ospf_ls_upd_send_queue start");
4084 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4085 rnext
= route_next(rn
);
4087 if (rn
->info
== NULL
)
4090 update
= (struct list
*)rn
->info
;
4092 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4094 /* list might not be empty. */
4095 if (listcount(update
) == 0) {
4096 list_delete((struct list
**)&rn
->info
);
4097 route_unlock_node(rn
);
4103 if (IS_DEBUG_OSPF_EVENT
)
4105 "ospf_ls_upd_send_queue: update lists not cleared,"
4106 " %d nodes to try again, raising new event",
4108 oi
->t_ls_upd_event
= NULL
;
4109 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4110 &oi
->t_ls_upd_event
);
4113 if (IS_DEBUG_OSPF_EVENT
)
4114 zlog_debug("ospf_ls_upd_send_queue stop");
4119 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4122 struct ospf_interface
*oi
;
4123 struct ospf_lsa
*lsa
;
4124 struct prefix_ipv4 p
;
4125 struct route_node
*rn
;
4126 struct listnode
*node
;
4131 p
.prefixlen
= IPV4_MAX_BITLEN
;
4133 /* Decide destination address. */
4134 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4135 p
.prefix
= oi
->vl_data
->peer_addr
;
4136 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4137 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4138 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4139 p
.prefix
= nbr
->address
.u
.prefix4
;
4140 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4141 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4142 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4143 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4145 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4147 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4148 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4151 "* LS-Update is directly sent on NBMA network.");
4152 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4153 flog_warn(EC_OSPF_PACKET
,
4154 "* LS-Update is sent to myself.");
4157 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4159 if (rn
->info
== NULL
)
4160 rn
->info
= list_new();
4162 route_unlock_node(rn
);
4164 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4165 listnode_add(rn
->info
,
4166 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4167 if (send_lsupd_now
) {
4168 struct list
*send_update_list
;
4169 struct route_node
*rnext
;
4171 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4172 rnext
= route_next(rn
);
4174 if (rn
->info
== NULL
)
4177 send_update_list
= (struct list
*)rn
->info
;
4179 ospf_ls_upd_queue_send(oi
, send_update_list
,
4180 rn
->p
.u
.prefix4
, 1);
4183 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4184 &oi
->t_ls_upd_event
);
4187 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4190 struct ospf_packet
*op
;
4191 uint16_t length
= OSPF_HEADER_SIZE
;
4193 op
= ospf_packet_new(oi
->ifp
->mtu
);
4195 /* Prepare OSPF common header. */
4196 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4198 /* Prepare OSPF Link State Acknowledgment body. */
4199 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4201 /* Fill OSPF header. */
4202 ospf_fill_header(oi
, op
->s
, length
);
4204 /* Set packet length. */
4205 op
->length
= length
;
4207 /* Decide destination address. */
4208 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4209 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4211 op
->dst
.s_addr
= dst
.s_addr
;
4213 /* Add packet to the interface output queue. */
4214 ospf_packet_add(oi
, op
);
4216 /* Hook thread to write packet. */
4217 OSPF_ISM_WRITE_ON(oi
->ospf
);
4220 static int ospf_ls_ack_send_event(struct thread
*thread
)
4222 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4224 oi
->t_ls_ack_direct
= NULL
;
4226 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4227 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4228 oi
->ls_ack_direct
.dst
);
4233 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4235 struct ospf_interface
*oi
= nbr
->oi
;
4237 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4238 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4240 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4242 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4243 &oi
->t_ls_ack_direct
);
4246 /* Send Link State Acknowledgment delayed. */
4247 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4251 /* Decide destination address. */
4252 /* RFC2328 Section 13.5 On non-broadcast
4253 networks, delayed Link State Acknowledgment packets must be
4254 unicast separately over each adjacency (i.e., neighbor whose
4255 state is >= Exchange). */
4256 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4257 struct ospf_neighbor
*nbr
;
4258 struct route_node
*rn
;
4260 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4261 if ((nbr
= rn
->info
) != NULL
)
4262 if (nbr
!= oi
->nbr_self
4263 && nbr
->state
>= NSM_Exchange
)
4264 while (listcount(oi
->ls_ack
))
4265 ospf_ls_ack_send_list(
4267 nbr
->address
.u
.prefix4
);
4270 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4271 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4272 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4273 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4274 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4275 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4276 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4277 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4279 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4281 while (listcount(oi
->ls_ack
))
4282 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4286 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4287 * address. As a result, the kernel does not need to learn the interface
4288 * MAC of the OSPF neighbor. However, in our world, this will delay
4289 * convergence. Take the case when due to a link flap, all routes now
4290 * want to use an interface which was deemed to be costlier prior to this
4291 * event. For routes that will be installed, the missing MAC will have
4292 * punt-to-CPU set on them. This may overload the CPU control path that
4293 * can be avoided if the MAC was known apriori.
4295 #define OSPF_PING_NBR_STR_MAX (BUFSIZ)
4296 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4298 char ping_nbr
[OSPF_PING_NBR_STR_MAX
];
4301 if (!nbr
|| !nbr
->oi
|| !nbr
->oi
->ifp
)
4304 snprintf(ping_nbr
, sizeof(ping_nbr
),
4305 "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr
->oi
->ifp
->name
,
4306 inet_ntoa(nbr
->address
.u
.prefix4
));
4308 ret
= system(ping_nbr
);
4309 if (IS_DEBUG_OSPF_EVENT
)
4310 zlog_debug("Executed %s %s", ping_nbr
,
4311 ((ret
== 0) ? "successfully" : "but failed"));