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 static 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 static void ospf_packet_add(struct ospf_interface
*oi
, struct ospf_packet
*op
)
236 /* Add packet to end of queue. */
237 ospf_fifo_push(oi
->obuf
, op
);
239 /* Debug of packet fifo*/
240 /* ospf_fifo_debug (oi->obuf); */
243 static void ospf_packet_add_top(struct ospf_interface
*oi
,
244 struct ospf_packet
*op
)
246 /* Add packet to head of queue. */
247 ospf_fifo_push_head(oi
->obuf
, op
);
249 /* Debug of packet fifo*/
250 /* ospf_fifo_debug (oi->obuf); */
253 static void ospf_packet_delete(struct ospf_interface
*oi
)
255 struct ospf_packet
*op
;
257 op
= ospf_fifo_pop(oi
->obuf
);
260 ospf_packet_free(op
);
263 static struct ospf_packet
*ospf_packet_dup(struct ospf_packet
*op
)
265 struct ospf_packet
*new;
267 if (stream_get_endp(op
->s
) != op
->length
)
270 "ospf_packet_dup stream %lu ospf_packet %u size mismatch",
271 (unsigned long)STREAM_SIZE(op
->s
), op
->length
);
273 /* Reserve space for MD5 authentication that may be added later. */
274 new = ospf_packet_new(stream_get_endp(op
->s
) + OSPF_AUTH_MD5_SIZE
);
275 stream_copy(new->s
, op
->s
);
278 new->length
= op
->length
;
284 static unsigned int ospf_packet_authspace(struct ospf_interface
*oi
)
288 if (ospf_auth_type(oi
) == OSPF_AUTH_CRYPTOGRAPHIC
)
289 auth
= OSPF_AUTH_MD5_SIZE
;
294 static unsigned int ospf_packet_max(struct ospf_interface
*oi
)
298 max
= oi
->ifp
->mtu
- ospf_packet_authspace(oi
);
300 max
-= (OSPF_HEADER_SIZE
+ sizeof(struct ip
));
306 static int ospf_check_md5_digest(struct ospf_interface
*oi
,
307 struct ospf_header
*ospfh
)
309 #ifdef CRYPTO_OPENSSL
311 #elif CRYPTO_INTERNAL
314 unsigned char digest
[OSPF_AUTH_MD5_SIZE
];
315 struct crypt_key
*ck
;
316 struct ospf_neighbor
*nbr
;
317 uint16_t length
= ntohs(ospfh
->length
);
319 /* Get secret key. */
320 ck
= ospf_crypt_key_lookup(OSPF_IF_PARAM(oi
, auth_crypt
),
321 ospfh
->u
.crypt
.key_id
);
323 flog_warn(EC_OSPF_MD5
, "interface %s: ospf_check_md5 no key %d",
324 IF_NAME(oi
), ospfh
->u
.crypt
.key_id
);
328 /* check crypto seqnum. */
329 nbr
= ospf_nbr_lookup_by_routerid(oi
->nbrs
, &ospfh
->router_id
);
332 && ntohl(nbr
->crypt_seqnum
) > ntohl(ospfh
->u
.crypt
.crypt_seqnum
)) {
335 "interface %s: ospf_check_md5 bad sequence %d (expect %d)",
336 IF_NAME(oi
), ntohl(ospfh
->u
.crypt
.crypt_seqnum
),
337 ntohl(nbr
->crypt_seqnum
));
341 /* Generate a digest for the ospf packet - their digest + our digest. */
342 #ifdef CRYPTO_OPENSSL
343 unsigned int md5_size
= OSPF_AUTH_MD5_SIZE
;
344 ctx
= EVP_MD_CTX_new();
345 EVP_DigestInit(ctx
, EVP_md5());
346 EVP_DigestUpdate(ctx
, ospfh
, length
);
347 EVP_DigestUpdate(ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
348 EVP_DigestFinal(ctx
, digest
, &md5_size
);
349 EVP_MD_CTX_free(ctx
);
350 #elif CRYPTO_INTERNAL
351 memset(&ctx
, 0, sizeof(ctx
));
353 MD5Update(&ctx
, ospfh
, length
);
354 MD5Update(&ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
355 MD5Final(digest
, &ctx
);
358 /* compare the two */
359 if (memcmp((caddr_t
)ospfh
+ length
, digest
, OSPF_AUTH_MD5_SIZE
)) {
360 flog_warn(EC_OSPF_MD5
,
361 "interface %s: ospf_check_md5 checksum mismatch",
366 /* save neighbor's crypt_seqnum */
368 nbr
->crypt_seqnum
= ospfh
->u
.crypt
.crypt_seqnum
;
372 /* This function is called from ospf_write(), it will detect the
373 authentication scheme and if it is MD5, it will change the sequence
374 and update the MD5 digest. */
375 static int ospf_make_md5_digest(struct ospf_interface
*oi
,
376 struct ospf_packet
*op
)
378 struct ospf_header
*ospfh
;
379 unsigned char digest
[OSPF_AUTH_MD5_SIZE
] = {0};
380 #ifdef CRYPTO_OPENSSL
382 #elif CRYPTO_INTERNAL
387 struct crypt_key
*ck
;
388 const uint8_t *auth_key
;
390 ibuf
= STREAM_DATA(op
->s
);
391 ospfh
= (struct ospf_header
*)ibuf
;
393 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
396 /* We do this here so when we dup a packet, we don't have to
397 waste CPU rewriting other headers.
399 Note that quagga_time /deliberately/ is not used here */
400 t
= (time(NULL
) & 0xFFFFFFFF);
401 if (t
> oi
->crypt_seqnum
)
402 oi
->crypt_seqnum
= t
;
406 ospfh
->u
.crypt
.crypt_seqnum
= htonl(oi
->crypt_seqnum
);
408 /* Get MD5 Authentication key from auth_key list. */
409 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
410 auth_key
= (const uint8_t *)digest
;
412 ck
= listgetdata(listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
413 auth_key
= ck
->auth_key
;
416 /* Generate a digest for the entire packet + our secret key. */
417 #ifdef CRYPTO_OPENSSL
418 unsigned int md5_size
= OSPF_AUTH_MD5_SIZE
;
419 ctx
= EVP_MD_CTX_new();
420 EVP_DigestInit(ctx
, EVP_md5());
421 EVP_DigestUpdate(ctx
, ibuf
, ntohs(ospfh
->length
));
422 EVP_DigestUpdate(ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
423 EVP_DigestFinal(ctx
, digest
, &md5_size
);
424 EVP_MD_CTX_free(ctx
);
425 #elif CRYPTO_INTERNAL
426 memset(&ctx
, 0, sizeof(ctx
));
428 MD5Update(&ctx
, ibuf
, ntohs(ospfh
->length
));
429 MD5Update(&ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
430 MD5Final(digest
, &ctx
);
433 /* Append md5 digest to the end of the stream. */
434 stream_put(op
->s
, digest
, OSPF_AUTH_MD5_SIZE
);
436 /* We do *NOT* increment the OSPF header length. */
437 op
->length
= ntohs(ospfh
->length
) + OSPF_AUTH_MD5_SIZE
;
439 if (stream_get_endp(op
->s
) != op
->length
)
443 "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u",
444 (unsigned long)stream_get_endp(op
->s
), op
->length
);
446 return OSPF_AUTH_MD5_SIZE
;
450 static int ospf_ls_req_timer(struct thread
*thread
)
452 struct ospf_neighbor
*nbr
;
454 nbr
= THREAD_ARG(thread
);
455 nbr
->t_ls_req
= NULL
;
457 /* Send Link State Request. */
458 if (ospf_ls_request_count(nbr
))
459 ospf_ls_req_send(nbr
);
461 /* Set Link State Request retransmission timer. */
462 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
467 void ospf_ls_req_event(struct ospf_neighbor
*nbr
)
470 thread_cancel(nbr
->t_ls_req
);
471 nbr
->t_ls_req
= NULL
;
473 nbr
->t_ls_req
= NULL
;
474 thread_add_event(master
, ospf_ls_req_timer
, nbr
, 0, &nbr
->t_ls_req
);
477 /* Cyclic timer function. Fist registered in ospf_nbr_new () in
479 int ospf_ls_upd_timer(struct thread
*thread
)
481 struct ospf_neighbor
*nbr
;
483 nbr
= THREAD_ARG(thread
);
484 nbr
->t_ls_upd
= NULL
;
486 /* Send Link State Update. */
487 if (ospf_ls_retransmit_count(nbr
) > 0) {
489 struct ospf_lsdb
*lsdb
;
491 int retransmit_interval
;
493 retransmit_interval
=
494 OSPF_IF_PARAM(nbr
->oi
, retransmit_interval
);
496 lsdb
= &nbr
->ls_rxmt
;
499 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
500 struct route_table
*table
= lsdb
->type
[i
].db
;
501 struct route_node
*rn
;
503 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
504 struct ospf_lsa
*lsa
;
506 if ((lsa
= rn
->info
) != NULL
) {
507 /* Don't retransmit an LSA if we
509 the last RxmtInterval seconds - this
511 neighbour a chance to acknowledge the
513 have ben just received before the
515 fired. This is a small tweak to what
517 but it will cut out out a lot of
520 if (monotime_since(&lsa
->tv_recv
, NULL
)
521 >= retransmit_interval
* 1000000LL)
522 listnode_add(update
, rn
->info
);
527 if (listcount(update
) > 0)
528 ospf_ls_upd_send(nbr
, update
, OSPF_SEND_PACKET_DIRECT
,
530 list_delete(&update
);
533 /* Set LS Update retransmission timer. */
534 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
, nbr
->v_ls_upd
);
539 int ospf_ls_ack_timer(struct thread
*thread
)
541 struct ospf_interface
*oi
;
543 oi
= THREAD_ARG(thread
);
546 /* Send Link State Acknowledgment. */
547 if (listcount(oi
->ls_ack
) > 0)
548 ospf_ls_ack_send_delayed(oi
);
550 /* Set LS Ack timer. */
551 OSPF_ISM_TIMER_ON(oi
->t_ls_ack
, ospf_ls_ack_timer
, oi
->v_ls_ack
);
556 #ifdef WANT_OSPF_WRITE_FRAGMENT
557 static void ospf_write_frags(int fd
, struct ospf_packet
*op
, struct ip
*iph
,
558 struct msghdr
*msg
, unsigned int maxdatasize
,
559 unsigned int mtu
, int flags
, uint8_t type
)
561 #define OSPF_WRITE_FRAG_SHIFT 3
566 assert(op
->length
== stream_get_endp(op
->s
));
567 assert(msg
->msg_iovlen
== 2);
571 * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
572 * well as the IP_MF flag, making this all quite pointless.
574 * However, for a system on which IP_MF is left alone, and ip_id left
575 * alone or else which sets same ip_id for each fragment this might
578 * XXX-TODO: It would be much nicer to have the kernel's use their
579 * existing fragmentation support to do this for us. Bugs/RFEs need to
580 * be raised against the various kernels.
584 iph
->ip_off
|= IP_MF
;
586 /* ip frag offset is expressed in units of 8byte words */
587 offset
= maxdatasize
>> OSPF_WRITE_FRAG_SHIFT
;
589 iovp
= &msg
->msg_iov
[1];
591 while ((stream_get_endp(op
->s
) - stream_get_getp(op
->s
))
593 /* data length of this frag is to next offset value */
594 iovp
->iov_len
= offset
<< OSPF_WRITE_FRAG_SHIFT
;
595 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
596 assert(iph
->ip_len
<= mtu
);
598 sockopt_iphdrincl_swab_htosys(iph
);
600 ret
= sendmsg(fd
, msg
, flags
);
602 sockopt_iphdrincl_swab_systoh(iph
);
607 "*** ospf_write_frags: sendmsg failed to %s,"
608 " id %d, off %d, len %d, mtu %u failed with %s",
609 inet_ntoa(iph
->ip_dst
), iph
->ip_id
, iph
->ip_off
,
610 iph
->ip_len
, mtu
, safe_strerror(errno
));
612 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
614 "ospf_write_frags: sent id %d, off %d, len %d to %s\n",
615 iph
->ip_id
, iph
->ip_off
, iph
->ip_len
,
616 inet_ntoa(iph
->ip_dst
));
619 iph
->ip_off
+= offset
;
620 stream_forward_getp(op
->s
, iovp
->iov_len
);
621 iovp
->iov_base
= stream_pnt(op
->s
);
624 /* setup for final fragment */
625 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
626 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
627 iph
->ip_off
&= (~IP_MF
);
629 #endif /* WANT_OSPF_WRITE_FRAGMENT */
631 static int ospf_write(struct thread
*thread
)
633 struct ospf
*ospf
= THREAD_ARG(thread
);
634 struct ospf_interface
*oi
;
635 struct ospf_interface
*last_serviced_oi
= NULL
;
636 struct ospf_packet
*op
;
637 struct sockaddr_in sa_dst
;
644 struct listnode
*node
;
645 #ifdef WANT_OSPF_WRITE_FRAGMENT
646 static uint16_t ipid
= 0;
647 uint16_t maxdatasize
;
648 #endif /* WANT_OSPF_WRITE_FRAGMENT */
649 #define OSPF_WRITE_IPHL_SHIFT 2
653 unsigned char cmsgbuf
[64] = {};
654 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
655 struct in_pktinfo
*pi
;
658 if (ospf
->fd
< 0 || ospf
->oi_running
== 0) {
659 if (IS_DEBUG_OSPF_EVENT
)
661 "ospf_write failed to send, fd %d, instance %u"
662 ,ospf
->fd
, ospf
->oi_running
);
666 node
= listhead(ospf
->oi_write_q
);
668 oi
= listgetdata(node
);
670 #ifdef WANT_OSPF_WRITE_FRAGMENT
671 /* seed ipid static with low order bits of time */
673 ipid
= (time(NULL
) & 0xffff);
674 #endif /* WANT_OSPF_WRITE_FRAGMENT */
676 while ((pkt_count
< ospf
->write_oi_count
) && oi
677 && (last_serviced_oi
!= oi
)) {
678 /* If there is only packet in the queue, the oi is removed from
679 write-q, so fix up the last interface that was serviced */
680 if (last_serviced_oi
== NULL
) {
681 last_serviced_oi
= oi
;
684 #ifdef WANT_OSPF_WRITE_FRAGMENT
685 /* convenience - max OSPF data per packet */
686 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
687 #endif /* WANT_OSPF_WRITE_FRAGMENT */
688 /* Get one packet from queue. */
689 op
= ospf_fifo_head(oi
->obuf
);
691 assert(op
->length
>= OSPF_HEADER_SIZE
);
693 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
694 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
695 ospf_if_ipmulticast(ospf
, oi
->address
,
698 /* Rewrite the md5 signature & update the seq */
699 ospf_make_md5_digest(oi
, op
);
701 /* Retrieve OSPF packet type. */
702 stream_set_getp(op
->s
, 1);
703 type
= stream_getc(op
->s
);
705 /* reset get pointer */
706 stream_set_getp(op
->s
, 0);
708 memset(&iph
, 0, sizeof(struct ip
));
709 memset(&sa_dst
, 0, sizeof(sa_dst
));
711 sa_dst
.sin_family
= AF_INET
;
712 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
713 sa_dst
.sin_len
= sizeof(sa_dst
);
714 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
715 sa_dst
.sin_addr
= op
->dst
;
716 sa_dst
.sin_port
= htons(0);
718 /* Set DONTROUTE flag if dst is unicast. */
719 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
720 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
721 flags
= MSG_DONTROUTE
;
723 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
724 /* it'd be very strange for header to not be 4byte-word aligned
726 if (sizeof(struct ip
)
727 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
728 iph
.ip_hl
++; /* we presume sizeof struct ip cant
731 iph
.ip_v
= IPVERSION
;
732 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
733 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
735 #if defined(__DragonFly__)
737 * DragonFly's raw socket expects ip_len/ip_off in network byte
740 iph
.ip_len
= htons(iph
.ip_len
);
743 #ifdef WANT_OSPF_WRITE_FRAGMENT
744 /* XXX-MT: not thread-safe at all..
745 * XXX: this presumes this is only programme sending OSPF
747 * otherwise, no guarantee ipid will be unique
750 #endif /* WANT_OSPF_WRITE_FRAGMENT */
753 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
754 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
756 iph
.ip_ttl
= OSPF_IP_TTL
;
757 iph
.ip_p
= IPPROTO_OSPFIGP
;
759 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
760 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
762 memset(&msg
, 0, sizeof(msg
));
763 msg
.msg_name
= (caddr_t
)&sa_dst
;
764 msg
.msg_namelen
= sizeof(sa_dst
);
768 iov
[0].iov_base
= (char *)&iph
;
769 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
770 iov
[1].iov_base
= stream_pnt(op
->s
);
771 iov
[1].iov_len
= op
->length
;
774 msg
.msg_control
= (caddr_t
)cm
;
775 cm
->cmsg_level
= SOL_IP
;
776 cm
->cmsg_type
= IP_PKTINFO
;
777 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
778 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
779 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
781 msg
.msg_controllen
= cm
->cmsg_len
;
784 /* Sadly we can not rely on kernels to fragment packets
785 * because of either IP_HDRINCL and/or multicast
786 * destination being set.
789 #ifdef WANT_OSPF_WRITE_FRAGMENT
790 if (op
->length
> maxdatasize
)
791 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
792 oi
->ifp
->mtu
, flags
, type
);
793 #endif /* WANT_OSPF_WRITE_FRAGMENT */
795 /* send final fragment (could be first) */
796 sockopt_iphdrincl_swab_htosys(&iph
);
797 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
798 sockopt_iphdrincl_swab_systoh(&iph
);
799 if (IS_DEBUG_OSPF_EVENT
)
802 "id %d, off %d, len %d, interface %s, mtu %u:",
803 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
804 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
809 "*** sendmsg in ospf_write failed to %s, "
810 "id %d, off %d, len %d, interface %s, mtu %u: %s",
811 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
812 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
813 safe_strerror(errno
));
815 /* Show debug sending packet. */
816 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
817 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
819 "-----------------------------------------------------");
820 stream_set_getp(op
->s
, 0);
821 ospf_packet_dump(op
->s
);
824 zlog_debug("%s sent to [%s] via [%s].",
825 lookup_msg(ospf_packet_type_str
, type
, NULL
),
826 inet_ntoa(op
->dst
), IF_NAME(oi
));
828 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
830 "-----------------------------------------------------");
837 case OSPF_MSG_DB_DESC
:
840 case OSPF_MSG_LS_REQ
:
843 case OSPF_MSG_LS_UPD
:
846 case OSPF_MSG_LS_ACK
:
853 /* Now delete packet from queue. */
854 ospf_packet_delete(oi
);
856 /* Move this interface to the tail of write_q to
857 serve everyone in a round robin fashion */
858 list_delete_node(ospf
->oi_write_q
, node
);
859 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
861 last_serviced_oi
= NULL
;
864 listnode_add(ospf
->oi_write_q
, oi
);
867 /* Setup to service from the head of the queue again */
868 if (!list_isempty(ospf
->oi_write_q
)) {
869 node
= listhead(ospf
->oi_write_q
);
870 oi
= listgetdata(node
);
874 /* If packets still remain in queue, call write thread. */
875 if (!list_isempty(ospf
->oi_write_q
))
876 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
882 /* OSPF Hello message read -- RFC2328 Section 10.5. */
883 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
884 struct stream
*s
, struct ospf_interface
*oi
, int size
)
886 struct ospf_hello
*hello
;
887 struct ospf_neighbor
*nbr
;
891 /* increment statistics. */
894 hello
= (struct ospf_hello
*)stream_pnt(s
);
896 /* If Hello is myself, silently discard. */
897 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
898 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
900 "ospf_header[%s/%s]: selforiginated, "
902 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
904 inet_ntoa(iph
->ip_src
));
909 /* get neighbor prefix. */
911 p
.prefixlen
= ip_masklen(hello
->network_mask
);
912 p
.u
.prefix4
= iph
->ip_src
;
914 /* Compare network mask. */
915 /* Checking is ignored for Point-to-Point and Virtual link. */
916 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
917 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
918 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
921 "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
922 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
),
923 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
927 /* Compare Router Dead Interval. */
928 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
929 flog_warn(EC_OSPF_PACKET
,
930 "Packet %s [Hello:RECV]: RouterDeadInterval mismatch "
931 "(expected %u, but received %u).",
932 inet_ntoa(ospfh
->router_id
),
933 OSPF_IF_PARAM(oi
, v_wait
),
934 ntohl(hello
->dead_interval
));
938 /* Compare Hello Interval - ignored if fast-hellos are set. */
939 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
940 if (OSPF_IF_PARAM(oi
, v_hello
)
941 != ntohs(hello
->hello_interval
)) {
944 "Packet %s [Hello:RECV]: HelloInterval mismatch "
945 "(expected %u, but received %u).",
946 inet_ntoa(ospfh
->router_id
),
947 OSPF_IF_PARAM(oi
, v_hello
),
948 ntohs(hello
->hello_interval
));
953 if (IS_DEBUG_OSPF_EVENT
)
954 zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s",
955 inet_ntoa(ospfh
->router_id
),
956 ospf_options_dump(hello
->options
),
957 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
959 /* Compare options. */
960 #define REJECT_IF_TBIT_ON 1 /* XXX */
961 #ifdef REJECT_IF_TBIT_ON
962 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
964 * This router does not support non-zero TOS.
965 * Drop this Hello packet not to establish neighbor
968 flog_warn(EC_OSPF_PACKET
,
969 "Packet %s [Hello:RECV]: T-bit on, drop it.",
970 inet_ntoa(ospfh
->router_id
));
973 #endif /* REJECT_IF_TBIT_ON */
975 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
976 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
978 * This router does know the correct usage of O-bit
979 * the bit should be set in DD packet only.
981 flog_warn(EC_OSPF_PACKET
,
982 "Packet %s [Hello:RECV]: O-bit abuse?",
983 inet_ntoa(ospfh
->router_id
));
984 #ifdef STRICT_OBIT_USAGE_CHECK
985 return; /* Reject this packet. */
986 #else /* STRICT_OBIT_USAGE_CHECK */
987 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
988 #endif /* STRICT_OBIT_USAGE_CHECK */
991 /* new for NSSA is to ensure that NP is on and E is off */
993 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
994 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
995 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
996 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
997 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
1000 "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x",
1001 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1005 if (IS_DEBUG_OSPF_NSSA
)
1006 zlog_debug("NSSA-Hello:RECV:Packet from %s:",
1007 inet_ntoa(ospfh
->router_id
));
1009 /* The setting of the E-bit found in the Hello Packet's Options
1010 field must match this area's ExternalRoutingCapability A
1011 mismatch causes processing to stop and the packet to be
1012 dropped. The setting of the rest of the bits in the Hello
1013 Packet's Options field should be ignored. */
1014 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1015 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1018 "Packet %s [Hello:RECV]: my options: %x, his options %x",
1019 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1024 /* get neighbour struct */
1025 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1027 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1030 old_state
= nbr
->state
;
1032 /* Add event to thread. */
1033 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1035 /* RFC2328 Section 9.5.1
1036 If the router is not eligible to become Designated Router,
1037 (snip) It must also send an Hello Packet in reply to an
1038 Hello Packet received from any eligible neighbor (other than
1039 the current Designated Router and Backup Designated Router). */
1040 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1041 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1042 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1043 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1044 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1045 ospf_hello_reply_timer
,
1046 OSPF_HELLO_REPLY_DELAY
);
1048 /* on NBMA network type, it happens to receive bidirectional Hello
1050 without advance 1-Way Received event.
1051 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1052 if (oi
->type
== OSPF_IFTYPE_NBMA
1053 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1054 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1055 nbr
->priority
= hello
->priority
;
1056 nbr
->d_router
= hello
->d_router
;
1057 nbr
->bd_router
= hello
->bd_router
;
1061 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1062 size
- OSPF_HELLO_MIN_SIZE
)) {
1063 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1064 nbr
->options
|= hello
->options
;
1066 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1067 /* Set neighbor information. */
1068 nbr
->priority
= hello
->priority
;
1069 nbr
->d_router
= hello
->d_router
;
1070 nbr
->bd_router
= hello
->bd_router
;
1074 /* If neighbor itself declares DR and no BDR exists,
1075 cause event BackupSeen */
1076 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1077 if (hello
->bd_router
.s_addr
== 0 && oi
->state
== ISM_Waiting
)
1078 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1080 /* neighbor itself declares BDR. */
1081 if (oi
->state
== ISM_Waiting
1082 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
))
1083 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1085 /* had not previously. */
1086 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1087 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1088 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1089 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->d_router
)))
1090 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1092 /* had not previously. */
1093 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1094 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1095 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1096 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
)))
1097 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1099 /* Neighbor priority check. */
1100 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1101 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1103 /* Set neighbor information. */
1104 nbr
->priority
= hello
->priority
;
1105 nbr
->d_router
= hello
->d_router
;
1106 nbr
->bd_router
= hello
->bd_router
;
1109 /* Save DD flags/options/Seqnum received. */
1110 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1111 struct ospf_db_desc
*dd
)
1113 nbr
->last_recv
.flags
= dd
->flags
;
1114 nbr
->last_recv
.options
= dd
->options
;
1115 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1118 /* Process rest of DD packet. */
1119 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1120 struct ospf_neighbor
*nbr
,
1121 struct ospf_db_desc
*dd
, uint16_t size
)
1123 struct ospf_lsa
*new, *find
;
1124 struct lsa_header
*lsah
;
1126 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1127 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1128 size
-= OSPF_LSA_HEADER_SIZE
) {
1129 lsah
= (struct lsa_header
*)stream_pnt(s
);
1130 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1132 /* Unknown LS type. */
1133 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1134 flog_warn(EC_OSPF_PACKET
,
1135 "Packet [DD:RECV]: Unknown LS type %d.",
1137 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1141 if (IS_OPAQUE_LSA(lsah
->type
)
1142 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1143 flog_warn(EC_OSPF_PACKET
,
1144 "LSA[Type%d:%s]: Opaque capability mismatch?",
1145 lsah
->type
, inet_ntoa(lsah
->id
));
1146 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1150 switch (lsah
->type
) {
1151 case OSPF_AS_EXTERNAL_LSA
:
1152 case OSPF_OPAQUE_AS_LSA
:
1153 /* Check for stub area. Reject if AS-External from stub
1155 allow if from NSSA. */
1156 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1159 "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.",
1160 lsah
->type
, inet_ntoa(lsah
->id
),
1161 (oi
->area
->external_routing
1165 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1166 NSM_SeqNumberMismatch
);
1174 /* Create LS-request object. */
1175 new = ospf_ls_request_new(lsah
);
1177 /* Lookup received LSA, then add LS request list. */
1178 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1180 /* ospf_lsa_more_recent is fine with NULL pointers */
1181 switch (ospf_lsa_more_recent(find
, new)) {
1183 /* Neighbour has a more recent LSA, we must request it
1185 ospf_ls_request_add(nbr
, new);
1188 /* If we have a copy of this LSA, it's either less
1190 * and we're requesting it from neighbour (the case
1192 * it's as recent and we both have same copy (this
1195 * In neither of these two cases is there any point in
1196 * describing our copy of the LSA to the neighbour in a
1197 * DB-Summary packet, if we're still intending to do so.
1199 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1200 * backward compatible optimisation to OSPF DB Exchange
1202 * DB Description process implemented here.
1205 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1206 ospf_lsa_discard(new);
1209 /* We have the more recent copy, nothing specific to do:
1210 * - no need to request neighbours stale copy
1211 * - must leave DB summary list copy alone
1213 if (IS_DEBUG_OSPF_EVENT
)
1215 "Packet [DD:RECV]: LSA received Type %d, "
1216 "ID %s is not recent.",
1217 lsah
->type
, inet_ntoa(lsah
->id
));
1218 ospf_lsa_discard(new);
1223 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1226 /* Both sides have no More, then we're done with Exchange */
1227 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1228 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1230 ospf_db_desc_send(nbr
);
1234 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1236 /* Send DD packet in reply.
1238 * Must be done to acknowledge the Master's DD, regardless of
1239 * whether we have more LSAs ourselves to describe.
1241 * This function will clear the 'More' bit, if after this DD
1242 * we have no more LSAs to describe to the master..
1244 ospf_db_desc_send(nbr
);
1246 /* Slave can raise ExchangeDone now, if master is also done */
1247 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1248 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1251 /* Save received neighbor values from DD. */
1252 ospf_db_desc_save_current(nbr
, dd
);
1255 ospf_ls_req_send(nbr
);
1258 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1259 struct ospf_neighbor
*nbr
)
1261 /* Is DD duplicated? */
1262 if (dd
->options
== nbr
->last_recv
.options
1263 && dd
->flags
== nbr
->last_recv
.flags
1264 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1270 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1271 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1272 struct stream
*s
, struct ospf_interface
*oi
,
1275 struct ospf_db_desc
*dd
;
1276 struct ospf_neighbor
*nbr
;
1278 /* Increment statistics. */
1281 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1283 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1285 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %s",
1286 inet_ntoa(ospfh
->router_id
));
1291 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1292 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1295 "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u",
1296 inet_ntoa(nbr
->router_id
), ntohs(dd
->mtu
), IF_NAME(oi
),
1302 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1304 * required. In fact at least JunOS sends DD packets with P bit clear.
1305 * Until proper solution is developped, this hack should help.
1307 * Update: According to the RFCs, N bit is specified /only/ for Hello
1308 * options, unfortunately its use in DD options is not specified. Hence
1310 * implementations follow E-bit semantics and set it in DD options, and
1312 * treat it as unspecified and hence follow the directive "default for
1313 * options is clear", ie unset.
1315 * Reset the flag, as ospfd follows E-bit semantics.
1317 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1318 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1319 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1320 if (IS_DEBUG_OSPF_EVENT
)
1322 "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options",
1323 inet_ntoa(nbr
->router_id
));
1324 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1327 #ifdef REJECT_IF_TBIT_ON
1328 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1330 * In Hello protocol, optional capability must have checked
1331 * to prevent this T-bit enabled router be my neighbor.
1333 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %s: T-bit on?",
1334 inet_ntoa(nbr
->router_id
));
1337 #endif /* REJECT_IF_TBIT_ON */
1339 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1340 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1342 * This node is not configured to handle O-bit, for now.
1343 * Clear it to ignore unsupported capability proposed by
1346 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1349 /* Add event to thread. */
1350 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1352 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1354 "%s:Packet[DD]: Neighbor %s state is %s, seq_num:0x%x, local:0x%x",
1355 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
1356 inet_ntoa(nbr
->router_id
),
1357 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
1358 ntohl(dd
->dd_seqnum
), nbr
->dd_seqnum
);
1360 /* Process DD packet by neighbor status. */
1361 switch (nbr
->state
) {
1365 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1367 "Packet[DD]: Neighbor %s state is %s, packet discarded.",
1368 inet_ntoa(nbr
->router_id
),
1369 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1373 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1374 /* If the new state is ExStart, the processing of the current
1375 packet should then continue in this new state by falling
1376 through to case ExStart below. */
1377 if (nbr
->state
!= NSM_ExStart
)
1382 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1383 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1384 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1386 /* We're Slave---obey */
1387 if (CHECK_FLAG(oi
->ospf
->config
,
1388 OSPF_LOG_ADJACENCY_DETAIL
))
1390 "Packet[DD]: Neighbor %s Negotiation done (Slave).",
1391 inet_ntoa(nbr
->router_id
));
1393 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1396 UNSET_FLAG(nbr
->dd_flags
,
1397 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1399 /* We're Master, ignore the initial DBD from
1401 if (CHECK_FLAG(oi
->ospf
->config
,
1402 OSPF_LOG_ADJACENCY_DETAIL
))
1404 "Packet[DD]: Neighbor %s: Initial DBD from Slave, "
1406 inet_ntoa(nbr
->router_id
));
1410 /* Ack from the Slave */
1411 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1412 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1413 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1416 "Packet[DD]: Neighbor %s Negotiation done (Master).",
1417 inet_ntoa(nbr
->router_id
));
1418 /* Reset I, leaving MS */
1419 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1421 flog_warn(EC_OSPF_PACKET
,
1422 "Packet[DD]: Neighbor %s Negotiation fails.",
1423 inet_ntoa(nbr
->router_id
));
1427 /* This is where the real Options are saved */
1428 nbr
->options
= dd
->options
;
1430 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1431 if (IS_DEBUG_OSPF_EVENT
)
1433 "Neighbor[%s] is %sOpaque-capable.",
1434 inet_ntoa(nbr
->router_id
),
1435 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1439 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1440 && IPV4_ADDR_SAME(&DR(oi
),
1441 &nbr
->address
.u
.prefix4
)) {
1444 "DR-neighbor[%s] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1445 inet_ntoa(nbr
->router_id
));
1446 /* This situation is undesirable, but not a real
1451 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1453 /* continue processing rest of packet. */
1454 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1457 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1458 if (IS_SET_DD_MS(nbr
->dd_flags
))
1459 /* Master: discard duplicated DD packet. */
1461 "Packet[DD] (Master): Neighbor %s packet duplicated.",
1462 inet_ntoa(nbr
->router_id
));
1464 /* Slave: cause to retransmit the last Database
1468 "Packet[DD] [Slave]: Neighbor %s packet duplicated.",
1469 inet_ntoa(nbr
->router_id
));
1470 ospf_db_desc_resend(nbr
);
1475 /* Otherwise DD packet should be checked. */
1476 /* Check Master/Slave bit mismatch */
1477 if (IS_SET_DD_MS(dd
->flags
)
1478 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1479 flog_warn(EC_OSPF_PACKET
,
1480 "Packet[DD]: Neighbor %s MS-bit mismatch.",
1481 inet_ntoa(nbr
->router_id
));
1482 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1483 if (IS_DEBUG_OSPF_EVENT
)
1485 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1486 dd
->flags
, nbr
->dd_flags
);
1490 /* Check initialize bit is set. */
1491 if (IS_SET_DD_I(dd
->flags
)) {
1492 zlog_info("Packet[DD]: Neighbor %s I-bit set.",
1493 inet_ntoa(nbr
->router_id
));
1494 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1498 /* Check DD Options. */
1499 if (dd
->options
!= nbr
->options
) {
1500 flog_warn(EC_OSPF_PACKET
,
1501 "Packet[DD]: Neighbor %s options mismatch.",
1502 inet_ntoa(nbr
->router_id
));
1503 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1507 /* Check DD sequence number. */
1508 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1509 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1510 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1511 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1514 "Packet[DD]: Neighbor %s sequence number mismatch.",
1515 inet_ntoa(nbr
->router_id
));
1516 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1520 /* Continue processing rest of packet. */
1521 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1525 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1526 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1527 /* Master should discard duplicate DD packet. */
1529 "Packet[DD]: Neighbor %s duplicated, "
1530 "packet discarded.",
1531 inet_ntoa(nbr
->router_id
));
1534 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1535 < nbr
->v_inactivity
* 1000000LL) {
1536 /* In states Loading and Full the slave
1538 its last Database Description packet
1540 duplicate Database Description
1542 from the master. For this reason the
1544 wait RouterDeadInterval seconds
1546 last Database Description packet.
1548 Database Description packet from the
1550 this interval will generate a
1552 neighbor event. RFC2328 Section 10.8
1554 ospf_db_desc_resend(nbr
);
1560 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1563 flog_warn(EC_OSPF_PACKET
,
1564 "Packet[DD]: Neighbor %s NSM illegal status %u.",
1565 inet_ntoa(nbr
->router_id
), nbr
->state
);
1570 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1572 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1573 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1574 struct stream
*s
, struct ospf_interface
*oi
,
1577 struct ospf_neighbor
*nbr
;
1579 struct in_addr ls_id
;
1580 struct in_addr adv_router
;
1581 struct ospf_lsa
*find
;
1582 struct list
*ls_upd
;
1583 unsigned int length
;
1585 /* Increment statistics. */
1588 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1590 flog_warn(EC_OSPF_PACKET
,
1591 "Link State Request: Unknown Neighbor %s.",
1592 inet_ntoa(ospfh
->router_id
));
1596 /* Add event to thread. */
1597 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1599 /* Neighbor State should be Exchange or later. */
1600 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1601 && nbr
->state
!= NSM_Full
) {
1604 "Link State Request received from %s: Neighbor state is %s, packet discarded.",
1605 inet_ntoa(ospfh
->router_id
),
1606 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1610 /* Send Link State Update for ALL requested LSAs. */
1611 ls_upd
= list_new();
1612 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1614 while (size
>= OSPF_LSA_KEY_SIZE
) {
1615 /* Get one slice of Link State Request. */
1616 ls_type
= stream_getl(s
);
1617 ls_id
.s_addr
= stream_get_ipv4(s
);
1618 adv_router
.s_addr
= stream_get_ipv4(s
);
1620 /* Verify LSA type. */
1621 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1622 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1623 list_delete(&ls_upd
);
1627 /* Search proper LSA in LSDB. */
1628 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1631 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1632 list_delete(&ls_upd
);
1636 /* Packet overflows MTU size, send immediately. */
1637 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1638 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1639 ospf_ls_upd_send(nbr
, ls_upd
,
1640 OSPF_SEND_PACKET_DIRECT
, 0);
1642 ospf_ls_upd_send(nbr
, ls_upd
,
1643 OSPF_SEND_PACKET_INDIRECT
, 0);
1645 /* Only remove list contents. Keep ls_upd. */
1646 list_delete_all_node(ls_upd
);
1648 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1651 /* Append LSA to update list. */
1652 listnode_add(ls_upd
, find
);
1653 length
+= ntohs(find
->data
->length
);
1655 size
-= OSPF_LSA_KEY_SIZE
;
1658 /* Send rest of Link State Update. */
1659 if (listcount(ls_upd
) > 0) {
1660 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1661 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1664 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1667 list_delete(&ls_upd
);
1669 list_delete(&ls_upd
);
1672 /* Get the list of LSAs from Link State Update packet.
1673 And process some validation -- RFC2328 Section 13. (1)-(2). */
1674 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1676 struct ospf_interface
*oi
, size_t size
)
1678 uint16_t count
, sum
;
1680 struct lsa_header
*lsah
;
1681 struct ospf_lsa
*lsa
;
1686 count
= stream_getl(s
);
1687 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1689 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1690 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1691 lsah
= (struct lsa_header
*)stream_pnt(s
);
1692 length
= ntohs(lsah
->length
);
1694 if (length
> size
) {
1697 "Link State Update: LSA length exceeds packet size.");
1701 /* Validate the LSA's LS checksum. */
1702 sum
= lsah
->checksum
;
1703 if (!ospf_lsa_checksum_valid(lsah
)) {
1704 /* (bug #685) more details in a one-line message make it
1706 * to identify problem source on the one hand and to
1708 * chance to compress repeated messages in syslog on the
1712 "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s",
1713 sum
, lsah
->checksum
, inet_ntoa(lsah
->id
),
1714 inet_ntoa(nbr
->src
), inet_ntoa(nbr
->router_id
),
1715 inet_ntoa(lsah
->adv_router
));
1719 /* Examine the LSA's LS type. */
1720 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1721 flog_warn(EC_OSPF_PACKET
,
1722 "Link State Update: Unknown LS type %d",
1728 * What if the received LSA's age is greater than MaxAge?
1729 * Treat it as a MaxAge case -- endo.
1731 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1732 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1734 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1735 #ifdef STRICT_OBIT_USAGE_CHECK
1736 if ((IS_OPAQUE_LSA(lsah
->type
)
1737 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1738 || (!IS_OPAQUE_LSA(lsah
->type
)
1739 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1741 * This neighbor must know the exact usage of
1743 * the bit will be set in Type-9,10,11 LSAs
1746 flog_warn(EC_OSPF_PACKET
,
1747 "LSA[Type%d:%s]: O-bit abuse?",
1748 lsah
->type
, inet_ntoa(lsah
->id
));
1751 #endif /* STRICT_OBIT_USAGE_CHECK */
1753 /* Do not take in AS External Opaque-LSAs if we are a
1755 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1756 && nbr
->oi
->area
->external_routing
1757 != OSPF_AREA_DEFAULT
) {
1758 if (IS_DEBUG_OSPF_EVENT
)
1760 "LSA[Type%d:%s]: We are a stub, don't take this LSA.",
1762 inet_ntoa(lsah
->id
));
1765 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1766 flog_warn(EC_OSPF_PACKET
,
1767 "LSA[Type%d:%s]: Opaque capability mismatch?",
1768 lsah
->type
, inet_ntoa(lsah
->id
));
1772 /* Create OSPF LSA instance. */
1773 lsa
= ospf_lsa_new_and_data(length
);
1775 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1776 /* We may wish to put some error checking if type NSSA comes in
1777 and area not in NSSA mode */
1778 switch (lsah
->type
) {
1779 case OSPF_AS_EXTERNAL_LSA
:
1780 case OSPF_OPAQUE_AS_LSA
:
1783 case OSPF_OPAQUE_LINK_LSA
:
1784 lsa
->oi
= oi
; /* Remember incoming interface for
1785 flooding control. */
1788 lsa
->area
= oi
->area
;
1792 memcpy(lsa
->data
, lsah
, length
);
1794 if (IS_DEBUG_OSPF_EVENT
)
1796 "LSA[Type%d:%s]: %p new LSA created with Link State Update",
1797 lsa
->data
->type
, inet_ntoa(lsa
->data
->id
),
1799 listnode_add(lsas
, lsa
);
1805 /* Cleanup Update list. */
1806 static void ospf_upd_list_clean(struct list
*lsas
)
1808 struct listnode
*node
, *nnode
;
1809 struct ospf_lsa
*lsa
;
1811 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1812 ospf_lsa_discard(lsa
);
1817 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1818 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1819 struct ospf_header
*ospfh
, struct stream
*s
,
1820 struct ospf_interface
*oi
, uint16_t size
)
1822 struct ospf_neighbor
*nbr
;
1824 struct listnode
*node
, *nnode
;
1825 struct ospf_lsa
*lsa
= NULL
;
1826 /* unsigned long ls_req_found = 0; */
1828 /* Dis-assemble the stream, update each entry, re-encapsulate for
1831 /* Increment statistics. */
1834 /* Check neighbor. */
1835 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1837 flog_warn(EC_OSPF_PACKET
,
1838 "Link State Update: Unknown Neighbor %s on int: %s",
1839 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
1843 /* Add event to thread. */
1844 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1846 /* Check neighbor state. */
1847 if (nbr
->state
< NSM_Exchange
) {
1848 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1850 "Link State Update: "
1851 "Neighbor[%s] state %s is less than Exchange",
1852 inet_ntoa(ospfh
->router_id
),
1853 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1858 /* Get list of LSAs from Link State Update packet. - Also perorms Stages
1859 * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
1862 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1866 #define DISCARD_LSA(L, N) \
1868 if (IS_DEBUG_OSPF_EVENT) \
1870 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1872 N, (void *)lsa, (int)lsa->data->type); \
1873 ospf_lsa_discard(L); \
1877 /* Process each LSA received in the one packet.
1879 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1880 * text below are from the steps in RFC 2328, Section 13.
1882 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1883 struct ospf_lsa
*ls_ret
, *current
;
1886 if (IS_DEBUG_OSPF_NSSA
) {
1887 char buf1
[INET_ADDRSTRLEN
];
1888 char buf2
[INET_ADDRSTRLEN
];
1889 char buf3
[INET_ADDRSTRLEN
];
1891 zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s",
1893 inet_ntop(AF_INET
, &ospfh
->router_id
, buf1
,
1895 inet_ntop(AF_INET
, &lsa
->data
->id
, buf2
,
1897 inet_ntop(AF_INET
, &lsa
->data
->adv_router
,
1898 buf3
, INET_ADDRSTRLEN
));
1901 listnode_delete(lsas
,
1902 lsa
); /* We don't need it in list anymore */
1904 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1907 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1909 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1912 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1915 /* Do take in Type-7's if we are an NSSA */
1917 /* If we are also an ABR, later translate them to a Type-5
1920 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1921 translate them to a separate Type-5 packet. */
1923 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1924 /* Reject from STUB or NSSA */
1925 if (nbr
->oi
->area
->external_routing
1926 != OSPF_AREA_DEFAULT
) {
1927 if (IS_DEBUG_OSPF_NSSA
)
1929 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1930 DISCARD_LSA(lsa
, 1);
1933 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1934 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1935 if (IS_DEBUG_OSPF_NSSA
)
1937 "Incoming NSSA LSA Discarded: Not NSSA Area");
1938 DISCARD_LSA(lsa
, 2);
1941 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1942 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1943 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1944 &lsa
->data
->adv_router
)) {
1945 char buf1
[INET_ADDRSTRLEN
];
1946 char buf2
[INET_ADDRSTRLEN
];
1947 char buf3
[INET_ADDRSTRLEN
];
1949 flog_err(EC_OSPF_ROUTER_LSA_MISMATCH
,
1950 "Incoming Router-LSA from %s with "
1951 "Adv-ID[%s] != LS-ID[%s]",
1952 inet_ntop(AF_INET
, &ospfh
->router_id
,
1953 buf1
, INET_ADDRSTRLEN
),
1954 inet_ntop(AF_INET
, &lsa
->data
->id
,
1955 buf2
, INET_ADDRSTRLEN
),
1957 &lsa
->data
->adv_router
, buf3
,
1960 EC_OSPF_DOMAIN_CORRUPT
,
1961 "OSPF domain compromised by attack or corruption. "
1962 "Verify correct operation of -ALL- OSPF routers.");
1963 DISCARD_LSA(lsa
, 0);
1966 /* Find the LSA in the current database. */
1968 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1970 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1972 no instance of the LSA in the router's link state database,
1973 and none of router's neighbors are in states Exchange or
1975 then take the following actions: */
1977 if (IS_LSA_MAXAGE(lsa
) && !current
1978 && ospf_check_nbr_status(oi
->ospf
)) {
1979 /* (4a) Response Link State Acknowledgment. */
1980 ospf_ls_ack_send(nbr
, lsa
);
1982 /* (4b) Discard LSA. */
1983 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1985 "Link State Update[%s]: LS age is equal to MaxAge.",
1988 DISCARD_LSA(lsa
, 3);
1991 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1992 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1993 &oi
->ospf
->router_id
)) {
1995 * Even if initial flushing seems to be completed, there
1997 * be a case that self-originated LSA with MaxAge still
1999 * in the routing domain.
2000 * Just send an LSAck message to cease retransmission.
2002 if (IS_LSA_MAXAGE(lsa
)) {
2003 zlog_info("LSA[%s]: Boomerang effect?",
2005 ospf_ls_ack_send(nbr
, lsa
);
2006 ospf_lsa_discard(lsa
);
2008 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2009 ospf_opaque_lsa_refresh_schedule(
2015 * If an instance of self-originated Opaque-LSA is not
2017 * in the LSDB, there are some possible cases here.
2019 * 1) This node lost opaque-capability after restart.
2020 * 2) Else, a part of opaque-type is no more supported.
2021 * 3) Else, a part of opaque-id is no more supported.
2023 * Anyway, it is still this node's responsibility to
2025 * Otherwise, the LSA instance remains in the routing
2027 * until its age reaches to MaxAge.
2029 /* XXX: We should deal with this for *ALL* LSAs, not
2031 if (current
== NULL
) {
2032 if (IS_DEBUG_OSPF_EVENT
)
2034 "LSA[%s]: Previously originated Opaque-LSA,"
2035 "not found in the LSDB.",
2038 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2040 ospf_opaque_self_originated_lsa_received(nbr
,
2042 ospf_ls_ack_send(nbr
, lsa
);
2048 /* It might be happen that received LSA is self-originated
2050 * router ID is changed. So, we should check if LSA is a
2052 * Link State ID is one of the router's own IP interface
2053 * addresses but whose
2054 * Advertising Router is not equal to the router's own Router ID
2055 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2059 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2060 struct listnode
*oinode
, *oinnode
;
2061 struct ospf_interface
*out_if
;
2064 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2069 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2071 && (!(IPV4_ADDR_SAME(
2072 &oi
->ospf
->router_id
,
2073 &lsa
->data
->adv_router
)))) {
2074 if (out_if
->network_lsa_self
) {
2075 ospf_lsa_flush_area(
2077 if (IS_DEBUG_OSPF_EVENT
)
2079 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2083 ospf_lsa_discard(lsa
);
2093 /* (5) Find the instance of this LSA that is currently contained
2094 in the router's link state database. If there is no
2095 database copy, or the received LSA is more recent than
2096 the database copy the following steps must be performed.
2097 (The sub steps from RFC 2328 section 13 step (5) will be
2102 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2104 if (current
&& (lsa
->data
->ls_seqnum
==
2105 htonl(OSPF_MAX_SEQUENCE_NUMBER
)
2106 && !IS_LSA_MAXAGE(lsa
))) {
2108 "Link State Update[%s]: has Max Seq but not MaxAge. Dropping it",
2111 DISCARD_LSA(lsa
, 4);
2114 /* Actual flooding procedure. */
2115 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2116 < 0) /* Trap NSSA later. */
2117 DISCARD_LSA(lsa
, 5);
2121 /* (6) Else, If there is an instance of the LSA on the sending
2122 neighbor's Link state request list, an error has occurred in
2123 the Database Exchange process. In this case, restart the
2124 Database Exchange process by generating the neighbor event
2125 BadLSReq for the sending neighbor and stop processing the
2126 Link State Update packet. */
2128 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2129 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2132 "LSA[%s] instance exists on Link state request list",
2135 /* Clean list of LSAs. */
2136 ospf_upd_list_clean(lsas
);
2137 /* this lsa is not on lsas list already. */
2138 ospf_lsa_discard(lsa
);
2142 /* If the received LSA is the same instance as the database copy
2143 (i.e., neither one is more recent) the following two steps
2144 should be performed: */
2147 /* If the LSA is listed in the Link state retransmission
2149 for the receiving adjacency, the router itself is
2151 an acknowledgment for this LSA. The router should
2153 received LSA as an acknowledgment by removing the LSA
2155 the Link state retransmission list. This is termed
2157 "implied acknowledgment". */
2159 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2161 if (ls_ret
!= NULL
) {
2162 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2164 /* Delayed acknowledgment sent if advertisement
2166 from Designated Router, otherwise do nothing.
2168 if (oi
->state
== ISM_Backup
)
2172 ospf_lsa_lock(lsa
));
2174 DISCARD_LSA(lsa
, 6);
2176 /* Acknowledge the receipt of the LSA by sending a
2177 Link State Acknowledgment packet back out the
2181 ospf_ls_ack_send(nbr
, lsa
);
2182 DISCARD_LSA(lsa
, 7);
2186 /* The database copy is more recent. If the database copy
2187 has LS age equal to MaxAge and LS sequence number equal to
2188 MaxSequenceNumber, simply discard the received LSA without
2189 acknowledging it. (In this case, the LSA's LS sequence number
2191 wrapping, and the MaxSequenceNumber LSA must be completely
2192 flushed before any new LSA instance can be introduced). */
2194 else if (ret
> 0) /* Database copy is more recent */
2196 if (IS_LSA_MAXAGE(current
)
2197 && current
->data
->ls_seqnum
2198 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2199 DISCARD_LSA(lsa
, 8);
2201 /* Otherwise, as long as the database copy has not been
2203 Link State Update within the last MinLSArrival
2205 database copy back to the sending neighbor,
2207 a Link State Update Packet. The Link State Update
2209 be sent directly to the neighbor. In so doing, do not
2211 database copy of the LSA on the neighbor's link state
2212 retransmission list, and do not acknowledge the
2214 recent) LSA instance. */
2216 if (monotime_since(¤t
->tv_orig
, NULL
)
2217 >= ospf
->min_ls_arrival
* 1000LL)
2218 /* Trap NSSA type later.*/
2219 ospf_ls_upd_send_lsa(
2221 OSPF_SEND_PACKET_DIRECT
);
2222 DISCARD_LSA(lsa
, 9);
2228 assert(listcount(lsas
) == 0);
2232 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2233 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2234 struct stream
*s
, struct ospf_interface
*oi
,
2237 struct ospf_neighbor
*nbr
;
2239 /* increment statistics. */
2242 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2244 flog_warn(EC_OSPF_PACKET
,
2245 "Link State Acknowledgment: Unknown Neighbor %s.",
2246 inet_ntoa(ospfh
->router_id
));
2250 /* Add event to thread. */
2251 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
2253 if (nbr
->state
< NSM_Exchange
) {
2254 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2256 "Link State Acknowledgment: "
2257 "Neighbor[%s] state %s is less than Exchange",
2258 inet_ntoa(ospfh
->router_id
),
2259 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2264 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2265 struct ospf_lsa
*lsa
, *lsr
;
2267 lsa
= ospf_lsa_new();
2268 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2269 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2271 /* lsah = (struct lsa_header *) stream_pnt (s); */
2272 size
-= OSPF_LSA_HEADER_SIZE
;
2273 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2275 if (lsa
->data
->type
< OSPF_MIN_LSA
2276 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2278 ospf_lsa_discard(lsa
);
2282 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2284 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0)
2285 ospf_ls_retransmit_delete(nbr
, lsr
);
2288 ospf_lsa_discard(lsa
);
2294 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2295 struct interface
**ifp
,
2296 struct stream
*ibuf
)
2301 ifindex_t ifindex
= 0;
2303 /* Header and data both require alignment. */
2304 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2307 memset(&msgh
, 0, sizeof(struct msghdr
));
2308 msgh
.msg_iov
= &iov
;
2309 msgh
.msg_iovlen
= 1;
2310 msgh
.msg_control
= (caddr_t
)buff
;
2311 msgh
.msg_controllen
= sizeof(buff
);
2313 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, MSG_DONTWAIT
,
2314 OSPF_MAX_PACKET_SIZE
+ 1);
2316 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
)
2317 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2318 safe_strerror(errno
));
2321 if ((unsigned int)ret
< sizeof(iph
)) /* ret must be > 0 now */
2325 "ospf_recv_packet: discarding runt packet of length %d "
2326 "(ip header size is %u)",
2327 ret
, (unsigned int)sizeof(iph
));
2331 /* Note that there should not be alignment problems with this assignment
2332 because this is at the beginning of the stream data buffer. */
2333 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2334 sockopt_iphdrincl_swab_systoh(iph
);
2336 ip_len
= iph
->ip_len
;
2338 #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000)
2340 * Kernel network code touches incoming IP header parameters,
2341 * before protocol specific processing.
2343 * 1) Convert byteorder to host representation.
2344 * --> ip_len, ip_id, ip_off
2346 * 2) Adjust ip_len to strip IP header size!
2347 * --> If user process receives entire IP packet via RAW
2348 * socket, it must consider adding IP header size to
2349 * the "ip_len" field of "ip" structure.
2351 * For more details, see <netinet/ip_input.c>.
2353 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2356 #if defined(__DragonFly__)
2358 * in DragonFly's raw socket, ip_len/ip_off are read
2359 * in network byte order.
2360 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2362 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2365 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2367 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2369 if (ret
!= ip_len
) {
2372 "ospf_recv_packet read length mismatch: ip_len is %d, "
2373 "but recvmsg returned %d",
2378 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2379 zlog_debug("%s: fd %d(%s) on interface %d(%s)",
2380 __PRETTY_FUNCTION__
, fd
, ospf_get_name(ospf
),
2381 ifindex
, *ifp
? (*ifp
)->name
: "Unknown");
2385 static struct ospf_interface
*
2386 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2387 struct ip
*iph
, struct ospf_header
*ospfh
)
2389 struct ospf_interface
*rcv_oi
;
2390 struct ospf_vl_data
*vl_data
;
2391 struct ospf_area
*vl_area
;
2392 struct listnode
*node
;
2394 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2395 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2398 /* look for local OSPF interface matching the destination
2399 * to determine Area ID. We presume therefore the destination address
2400 * is unique, or at least (for "unnumbered" links), not used in other
2403 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2407 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2409 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2413 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2414 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2415 if (IS_DEBUG_OSPF_EVENT
)
2416 zlog_debug("associating packet with %s",
2417 IF_NAME(vl_data
->vl_oi
));
2418 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2419 if (IS_DEBUG_OSPF_EVENT
)
2421 "This VL is not up yet, sorry");
2425 return vl_data
->vl_oi
;
2429 if (IS_DEBUG_OSPF_EVENT
)
2430 zlog_debug("couldn't find any VL to associate the packet with");
2435 static int ospf_check_area_id(struct ospf_interface
*oi
,
2436 struct ospf_header
*ospfh
)
2438 /* Check match the Area ID of the receiving interface. */
2439 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2445 /* Unbound socket will accept any Raw IP packets if proto is matched.
2446 To prevent it, compare src IP address and i/f address with masking
2447 i/f network mask. */
2448 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2449 struct in_addr ip_src
)
2451 struct in_addr mask
, me
, him
;
2453 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2454 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2457 masklen2ip(oi
->address
->prefixlen
, &mask
);
2459 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2460 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2462 if (IPV4_ADDR_SAME(&me
, &him
))
2468 /* Return 1, if the packet is properly authenticated and checksummed,
2469 0 otherwise. In particular, check that AuType header field is valid and
2470 matches the locally configured AuType, and that D.5 requirements are met. */
2471 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2473 struct crypt_key
*ck
;
2474 uint16_t iface_auth_type
;
2475 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2477 switch (pkt_auth_type
) {
2478 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2479 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2480 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2483 "interface %s: auth-type mismatch, local %s, rcvd Null",
2485 lookup_msg(ospf_auth_type_str
,
2486 iface_auth_type
, NULL
));
2489 if (!ospf_check_sum(ospfh
)) {
2490 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2493 "interface %s: Null auth OK, but checksum error, Router-ID %s",
2495 inet_ntoa(ospfh
->router_id
));
2499 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2500 if (OSPF_AUTH_SIMPLE
2501 != (iface_auth_type
= ospf_auth_type(oi
))) {
2502 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2505 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2507 lookup_msg(ospf_auth_type_str
,
2508 iface_auth_type
, NULL
));
2511 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2512 OSPF_AUTH_SIMPLE_SIZE
)) {
2513 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2514 flog_warn(EC_OSPF_PACKET
,
2515 "interface %s: Simple auth failed",
2519 if (!ospf_check_sum(ospfh
)) {
2520 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2523 "interface %s: Simple auth OK, checksum error, Router-ID %s",
2525 inet_ntoa(ospfh
->router_id
));
2529 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2530 if (OSPF_AUTH_CRYPTOGRAPHIC
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 Cryptographic",
2537 lookup_msg(ospf_auth_type_str
,
2538 iface_auth_type
, NULL
));
2541 if (ospfh
->checksum
) {
2542 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2545 "interface %s: OSPF header checksum is not 0",
2549 /* only MD5 crypto method can pass ospf_packet_examin() */
2550 if (NULL
== (ck
= listgetdata(
2551 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2552 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2553 /* Condition above uses the last key ID on the list,
2555 different from what ospf_crypt_key_lookup() does. A
2557 !ospf_check_md5_digest(oi
, ospfh
)) {
2558 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2559 flog_warn(EC_OSPF_MD5
,
2560 "interface %s: MD5 auth failed",
2566 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2569 "interface %s: invalid packet auth-type (%02x)",
2570 IF_NAME(oi
), pkt_auth_type
);
2575 static int ospf_check_sum(struct ospf_header
*ospfh
)
2580 /* clear auth_data for checksum. */
2581 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2583 /* keep checksum and clear. */
2584 sum
= ospfh
->checksum
;
2585 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2587 /* calculate checksum. */
2588 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2591 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2599 /* Verify, that given link/TOS records are properly sized/aligned and match
2600 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2601 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2603 const uint16_t num_links
)
2605 unsigned counted_links
= 0, thislinklen
;
2609 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2610 if (thislinklen
> linkbytes
) {
2611 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2612 zlog_debug("%s: length error in link block #%u",
2613 __func__
, counted_links
);
2616 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2617 linkbytes
-= thislinklen
;
2620 if (counted_links
!= num_links
) {
2621 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2622 zlog_debug("%s: %u link blocks declared, %u present",
2623 __func__
, num_links
, counted_links
);
2629 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2630 minimum length constraint). */
2631 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2632 const uint8_t headeronly
)
2635 struct router_lsa
*rlsa
;
2636 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2637 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2638 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2639 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2640 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2644 switch (lsah
->type
) {
2645 case OSPF_ROUTER_LSA
:
2646 /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1
2647 * (12+)-byte link blocks */
2649 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2650 - OSPF_ROUTER_LSA_MIN_SIZE
)
2656 rlsa
= (struct router_lsa
*)lsah
;
2657 ret
= ospf_router_lsa_links_examin(
2658 (struct router_lsa_link
*)rlsa
->link
,
2659 lsalen
- OSPF_LSA_HEADER_SIZE
- 4, /* skip: basic
2662 ntohs(rlsa
->links
) /* 16 bits */
2665 case OSPF_AS_EXTERNAL_LSA
:
2666 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2668 case OSPF_AS_NSSA_LSA
:
2669 /* RFC3101 C, idem */
2670 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2671 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2676 /* Following LSA types are considered OK length-wise as soon as their
2678 * length constraint is met and length of the whole LSA is a multiple of
2680 * (basic LSA header size is already a multiple of 4). */
2681 case OSPF_NETWORK_LSA
:
2682 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2683 case OSPF_SUMMARY_LSA
:
2684 case OSPF_ASBR_SUMMARY_LSA
:
2685 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2687 case OSPF_OPAQUE_LINK_LSA
:
2688 case OSPF_OPAQUE_AREA_LSA
:
2689 case OSPF_OPAQUE_AS_LSA
:
2690 /* RFC5250 A.2, "some number of octets (of application-specific
2691 * data) padded to 32-bit alignment." This is considered
2693 * to 4-byte alignment of all other LSA types, see
2694 * OSPF-ALIGNMENT.txt
2695 * file for the detailed analysis of this passage. */
2696 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2699 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2700 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2704 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2705 zlog_debug("%s: alignment error in %s", __func__
,
2706 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2710 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2711 includes verification of LSA blocks length/alignment and dispatching
2712 of deeper-level checks. */
2714 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2715 size_t length
, const uint8_t headeronly
,
2716 /* When declared_num_lsas is not 0, compare it to the real
2718 and treat the difference as an error. */
2719 const uint32_t declared_num_lsas
)
2721 uint32_t counted_lsas
= 0;
2725 if (length
< OSPF_LSA_HEADER_SIZE
) {
2726 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2728 "%s: undersized (%zu B) trailing (#%u) LSA header",
2729 __func__
, length
, counted_lsas
);
2732 /* save on ntohs() calls here and in the LSA validator */
2733 lsalen
= ntohs(lsah
->length
);
2734 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2735 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2737 "%s: malformed LSA header #%u, declared length is %u B",
2738 __func__
, counted_lsas
, lsalen
);
2742 /* less checks here and in ospf_lsa_examin() */
2743 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2744 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2746 "%s: malformed header-only LSA #%u",
2747 __func__
, counted_lsas
);
2750 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2751 + OSPF_LSA_HEADER_SIZE
);
2752 length
-= OSPF_LSA_HEADER_SIZE
;
2754 /* make sure the input buffer is deep enough before
2756 if (lsalen
> length
) {
2757 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2759 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2760 __func__
, counted_lsas
, lsalen
,
2764 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2765 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2766 zlog_debug("%s: malformed LSA #%u",
2767 __func__
, counted_lsas
);
2770 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2776 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2777 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2779 "%s: #LSAs declared (%u) does not match actual (%u)",
2780 __func__
, declared_num_lsas
, counted_lsas
);
2786 /* Verify a complete OSPF packet for proper sizing/alignment. */
2787 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2788 const unsigned bytesonwire
)
2790 uint16_t bytesdeclared
, bytesauth
;
2792 struct ospf_ls_update
*lsupd
;
2794 /* Length, 1st approximation. */
2795 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2796 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2797 zlog_debug("%s: undersized (%u B) packet", __func__
,
2801 /* Now it is safe to access header fields. Performing length check,
2803 * for possible extra bytes of crypto auth/padding, which are not
2805 * in the OSPF header "length" field. */
2806 if (oh
->version
!= OSPF_VERSION
) {
2807 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2808 zlog_debug("%s: invalid (%u) protocol version",
2809 __func__
, oh
->version
);
2812 bytesdeclared
= ntohs(oh
->length
);
2813 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2816 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2817 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2819 "%s: unsupported crypto auth length (%u B)",
2820 __func__
, oh
->u
.crypt
.auth_data_len
);
2823 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2825 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2826 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2828 "%s: packet length error (%u real, %u+%u declared)",
2829 __func__
, bytesonwire
, bytesdeclared
,
2833 /* Length, 2nd approximation. The type-specific constraint is checked
2834 against declared length, not amount of bytes on wire. */
2835 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2837 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2838 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2839 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2841 lookup_msg(ospf_packet_type_str
, oh
->type
,
2846 case OSPF_MSG_HELLO
:
2847 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2849 by N>=0 router-IDs. */
2850 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2855 case OSPF_MSG_DB_DESC
:
2856 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2858 by N>=0 header-only LSAs. */
2859 ret
= ospf_lsaseq_examin(
2860 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2861 + OSPF_DB_DESC_MIN_SIZE
),
2862 bytesdeclared
- OSPF_HEADER_SIZE
2863 - OSPF_DB_DESC_MIN_SIZE
,
2864 1, /* header-only LSAs */
2867 case OSPF_MSG_LS_REQ
:
2868 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2869 * request blocks. */
2870 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2875 case OSPF_MSG_LS_UPD
:
2876 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2878 by N>=0 full LSAs (with N declared beforehand). */
2879 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2880 + OSPF_HEADER_SIZE
);
2881 ret
= ospf_lsaseq_examin(
2882 (struct lsa_header
*)((caddr_t
)lsupd
2883 + OSPF_LS_UPD_MIN_SIZE
),
2884 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2886 ntohl(lsupd
->num_lsas
) /* 32 bits */
2889 case OSPF_MSG_LS_ACK
:
2890 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2892 ret
= ospf_lsaseq_examin(
2893 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2894 + OSPF_LS_ACK_MIN_SIZE
),
2895 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2896 1, /* header-only LSAs */
2900 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2901 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2905 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2906 zlog_debug("%s: malformed %s packet", __func__
,
2907 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2911 /* OSPF Header verification. */
2912 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2913 struct ip
*iph
, struct ospf_header
*ospfh
)
2915 /* Check Area ID. */
2916 if (!ospf_check_area_id(oi
, ospfh
)) {
2917 flog_warn(EC_OSPF_PACKET
,
2918 "interface %s: ospf_read invalid Area ID %s.",
2919 IF_NAME(oi
), inet_ntoa(ospfh
->area_id
));
2923 /* Check network mask, Silently discarded. */
2924 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2927 "interface %s: ospf_read network address is not same [%s]",
2928 IF_NAME(oi
), inet_ntoa(iph
->ip_src
));
2932 /* Check authentication. The function handles logging actions, where
2934 if (!ospf_check_auth(oi
, ospfh
))
2940 enum ospf_read_return_enum
{
2945 static enum ospf_read_return_enum
ospf_read_helper(struct ospf
*ospf
)
2948 struct stream
*ibuf
;
2949 struct ospf_interface
*oi
;
2951 struct ospf_header
*ospfh
;
2953 struct connected
*c
;
2954 struct interface
*ifp
= NULL
;
2956 stream_reset(ospf
->ibuf
);
2957 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2959 return OSPF_READ_ERROR
;
2962 * This raw packet is known to be at least as big as its
2963 * IP header. Note that there should not be alignment problems with
2964 * this assignment because this is at the beginning of the
2965 * stream data buffer.
2967 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2969 * Note that sockopt_iphdrincl_swab_systoh was called in
2974 * Handle cases where the platform does not support
2975 * retrieving the ifindex, and also platforms (such as
2976 * Solaris 8) that claim to support ifindex retrieval but do
2979 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2984 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2986 "%s: Unable to determine incoming interface from: %s(%s)",
2987 __PRETTY_FUNCTION__
,
2988 inet_ntoa(iph
->ip_src
),
2989 ospf_get_name(ospf
));
2990 return OSPF_READ_CONTINUE
;
2994 /* Self-originated packet should be discarded silently. */
2995 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
2996 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
2998 "ospf_read[%s]: Dropping self-originated packet",
2999 inet_ntoa(iph
->ip_src
));
3001 return OSPF_READ_CONTINUE
;
3005 * Advance from IP header to OSPF header (iph->ip_hl has
3006 * been verified by ospf_recv_packet() to be correct).
3008 stream_forward_getp(ibuf
, iph
->ip_hl
* 4);
3010 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3012 != ospf_packet_examin(ospfh
, stream_get_endp(ibuf
)
3013 - stream_get_getp(ibuf
)))
3014 return OSPF_READ_CONTINUE
;
3015 /* Now it is safe to access all fields of OSPF packet header. */
3017 /* associate packet with ospf interface */
3018 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3021 * ospf_verify_header() relies on a valid "oi" and thus can be called
3022 * only after the passive/backbone/other checks below are passed.
3023 * These checks in turn access the fields of unverified "ospfh"
3024 * structure for their own purposes and must remain very accurate
3028 /* If incoming interface is passive one, ignore it. */
3029 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3030 char buf
[3][INET_ADDRSTRLEN
];
3032 if (IS_DEBUG_OSPF_EVENT
)
3034 "ignoring packet from router %s sent to %s, received on a passive interface, %s",
3035 inet_ntop(AF_INET
, &ospfh
->router_id
, buf
[0],
3037 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3039 inet_ntop(AF_INET
, &oi
->address
->u
.prefix4
,
3040 buf
[2], sizeof(buf
[2])));
3042 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3043 /* Try to fix multicast membership.
3044 * Some OS:es may have problems in this area,
3045 * make sure it is removed.
3047 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3048 ospf_if_set_multicast(oi
);
3050 return OSPF_READ_CONTINUE
;
3054 /* if no local ospf_interface,
3055 * or header area is backbone but ospf_interface is not
3056 * check for VLINK interface
3059 || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3060 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3061 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3063 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3065 "Packet from [%s] received on link %s but no ospf_interface",
3066 inet_ntoa(iph
->ip_src
), ifp
->name
);
3067 return OSPF_READ_CONTINUE
;
3072 * else it must be a local ospf interface, check it was
3073 * received on correct link
3075 else if (oi
->ifp
!= ifp
) {
3076 if (IS_DEBUG_OSPF_EVENT
)
3077 flog_warn(EC_OSPF_PACKET
,
3078 "Packet from [%s] received on wrong link %s",
3079 inet_ntoa(iph
->ip_src
), ifp
->name
);
3080 return OSPF_READ_CONTINUE
;
3081 } else if (oi
->state
== ISM_Down
) {
3082 char buf
[2][INET_ADDRSTRLEN
];
3086 "Ignoring packet from %s to %s received on interface that is down [%s]; interface flags are %s",
3087 inet_ntop(AF_INET
, &iph
->ip_src
, buf
[0],
3089 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3091 ifp
->name
, if_flag_dump(ifp
->flags
));
3092 /* Fix multicast memberships? */
3093 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3094 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3095 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3096 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3097 if (oi
->multicast_memberships
)
3098 ospf_if_set_multicast(oi
);
3099 return OSPF_READ_CONTINUE
;
3103 * If the received packet is destined for AllDRouters, the
3104 * packet should be accepted only if the received ospf
3105 * interface state is either DR or Backup -- endo.
3107 * I wonder who endo is?
3109 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3110 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3113 "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)",
3114 inet_ntoa(iph
->ip_src
), IF_NAME(oi
),
3115 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3116 /* Try to fix multicast membership. */
3117 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3118 ospf_if_set_multicast(oi
);
3119 return OSPF_READ_CONTINUE
;
3122 /* Verify more OSPF header fields. */
3123 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3125 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3127 "ospf_read[%s]: Header check failed, "
3129 inet_ntoa(iph
->ip_src
));
3130 return OSPF_READ_CONTINUE
;
3133 /* Show debug receiving packet. */
3134 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3135 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3137 "-----------------------------------------------------");
3138 ospf_packet_dump(ibuf
);
3141 zlog_debug("%s received from [%s] via [%s]",
3142 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3143 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
3144 zlog_debug(" src [%s],", inet_ntoa(iph
->ip_src
));
3145 zlog_debug(" dst [%s]", inet_ntoa(iph
->ip_dst
));
3147 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3149 "-----------------------------------------------------");
3152 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3154 /* Adjust size to message length. */
3155 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3157 /* Read rest of the packet and call each sort of packet routine.
3159 switch (ospfh
->type
) {
3160 case OSPF_MSG_HELLO
:
3161 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3163 case OSPF_MSG_DB_DESC
:
3164 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3166 case OSPF_MSG_LS_REQ
:
3167 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3169 case OSPF_MSG_LS_UPD
:
3170 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3172 case OSPF_MSG_LS_ACK
:
3173 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3178 "interface %s(%s): OSPF packet header type %d is illegal",
3179 IF_NAME(oi
), ospf_get_name(ospf
), ospfh
->type
);
3183 return OSPF_READ_CONTINUE
;
3186 /* Starting point of packet process function. */
3187 int ospf_read(struct thread
*thread
)
3191 enum ospf_read_return_enum ret
;
3193 /* first of all get interface pointer. */
3194 ospf
= THREAD_ARG(thread
);
3196 /* prepare for next packet. */
3197 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
3199 while (count
< ospf
->write_oi_count
) {
3201 ret
= ospf_read_helper(ospf
);
3203 case OSPF_READ_ERROR
:
3206 case OSPF_READ_CONTINUE
:
3214 /* Make OSPF header. */
3215 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3218 struct ospf_header
*ospfh
;
3220 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3222 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3223 ospfh
->type
= (uint8_t)type
;
3225 ospfh
->router_id
= oi
->ospf
->router_id
;
3227 ospfh
->checksum
= 0;
3228 ospfh
->area_id
= oi
->area
->area_id
;
3229 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3231 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3233 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3236 /* Make Authentication Data. */
3237 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3239 struct crypt_key
*ck
;
3241 switch (ospf_auth_type(oi
)) {
3242 case OSPF_AUTH_NULL
:
3243 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3246 case OSPF_AUTH_SIMPLE
:
3247 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3248 OSPF_AUTH_SIMPLE_SIZE
);
3250 case OSPF_AUTH_CRYPTOGRAPHIC
:
3251 /* If key is not set, then set 0. */
3252 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3253 ospfh
->u
.crypt
.zero
= 0;
3254 ospfh
->u
.crypt
.key_id
= 0;
3255 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3258 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3259 ospfh
->u
.crypt
.zero
= 0;
3260 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3261 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3263 /* note: the seq is done in ospf_make_md5_digest() */
3266 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3274 /* Fill rest of OSPF header. */
3275 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3278 struct ospf_header
*ospfh
;
3280 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3283 ospfh
->length
= htons(length
);
3285 /* Calculate checksum. */
3286 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3287 ospfh
->checksum
= in_cksum(ospfh
, length
);
3289 ospfh
->checksum
= 0;
3291 /* Add Authentication Data. */
3292 ospf_make_auth(oi
, ospfh
);
3295 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3297 struct ospf_neighbor
*nbr
;
3298 struct route_node
*rn
;
3299 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3300 struct in_addr mask
;
3304 /* Set netmask of interface. */
3305 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3306 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3307 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3308 masklen2ip(oi
->address
->prefixlen
, &mask
);
3310 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3311 stream_put_ipv4(s
, mask
.s_addr
);
3313 /* Set Hello Interval. */
3314 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3315 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3317 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3319 if (IS_DEBUG_OSPF_EVENT
)
3320 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3324 stream_putc(s
, OPTIONS(oi
));
3326 /* Set Router Priority. */
3327 stream_putc(s
, PRIORITY(oi
));
3329 /* Set Router Dead Interval. */
3330 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3332 /* Set Designated Router. */
3333 stream_put_ipv4(s
, DR(oi
).s_addr
);
3335 p
= stream_get_endp(s
);
3337 /* Set Backup Designated Router. */
3338 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3340 /* Add neighbor seen. */
3341 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3342 if ((nbr
= rn
->info
))
3343 if (nbr
->router_id
.s_addr
3344 != 0) /* Ignore 0.0.0.0 node. */
3346 != NSM_Attempt
) /* Ignore Down neighbor. */
3348 != NSM_Down
) /* This is myself for
3350 if (!IPV4_ADDR_SAME(
3352 &oi
->ospf
->router_id
)) {
3353 /* Check neighbor is
3355 if (nbr
->d_router
.s_addr
3369 /* Hello packet overflows interface MTU. */
3370 if (length
+ sizeof(uint32_t)
3371 > ospf_packet_max(oi
)) {
3373 EC_OSPF_LARGE_HELLO
,
3374 "Oversized Hello packet! Larger than MTU. Not sending it out");
3385 /* Let neighbor generate BackupSeen. */
3387 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3392 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3393 struct ospf_neighbor
*nbr
, struct stream
*s
)
3395 struct ospf_lsa
*lsa
;
3396 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3400 struct ospf_lsdb
*lsdb
;
3402 /* Set Interface MTU. */
3403 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3406 stream_putw(s
, oi
->ifp
->mtu
);
3409 options
= OPTIONS(oi
);
3410 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3411 SET_FLAG(options
, OSPF_OPTION_O
);
3412 stream_putc(s
, options
);
3415 pp
= stream_get_endp(s
);
3416 stream_putc(s
, nbr
->dd_flags
);
3418 /* Set DD Sequence Number. */
3419 stream_putl(s
, nbr
->dd_seqnum
);
3421 /* shortcut unneeded walk of (empty) summary LSDBs */
3422 if (ospf_db_summary_isempty(nbr
))
3425 /* Describe LSA Header from Database Summary List. */
3426 lsdb
= &nbr
->db_sum
;
3428 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3429 struct route_table
*table
= lsdb
->type
[i
].db
;
3430 struct route_node
*rn
;
3432 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3433 if ((lsa
= rn
->info
) != NULL
) {
3434 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3435 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3436 /* Suppress advertising
3437 * opaque-information. */
3438 /* Remove LSA from DB summary list. */
3439 ospf_lsdb_delete(lsdb
, lsa
);
3443 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3444 struct lsa_header
*lsah
;
3447 /* DD packet overflows interface MTU. */
3448 if (length
+ OSPF_LSA_HEADER_SIZE
3449 > ospf_packet_max(oi
))
3452 /* Keep pointer to LS age. */
3453 lsah
= (struct lsa_header
3458 /* Proceed stream pointer. */
3459 stream_put(s
, lsa
->data
,
3460 OSPF_LSA_HEADER_SIZE
);
3461 length
+= OSPF_LSA_HEADER_SIZE
;
3464 ls_age
= LS_AGE(lsa
);
3465 lsah
->ls_age
= htons(ls_age
);
3468 /* Remove LSA from DB summary list. */
3469 ospf_lsdb_delete(lsdb
, lsa
);
3473 /* Update 'More' bit */
3474 if (ospf_db_summary_isempty(nbr
)) {
3476 if (nbr
->state
>= NSM_Exchange
) {
3477 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3478 /* Rewrite DD flags */
3479 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3481 assert(IS_SET_DD_M(nbr
->dd_flags
));
3487 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3488 unsigned long delta
, struct ospf_neighbor
*nbr
,
3489 struct ospf_lsa
*lsa
)
3491 struct ospf_interface
*oi
;
3495 /* LS Request packet overflows interface MTU
3496 * delta is just number of bytes required for 1 LS Req
3497 * ospf_packet_max will return the number of bytes can
3498 * be accomodated without ospf header. So length+delta
3499 * can be compared to ospf_packet_max
3500 * to check if it can fit another lsreq in the same packet.
3503 if (*length
+ delta
> ospf_packet_max(oi
))
3506 stream_putl(s
, lsa
->data
->type
);
3507 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3508 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3510 ospf_lsa_unlock(&nbr
->ls_req_last
);
3511 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3517 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3519 struct ospf_lsa
*lsa
;
3520 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3521 unsigned long delta
= 12;
3522 struct route_table
*table
;
3523 struct route_node
*rn
;
3525 struct ospf_lsdb
*lsdb
;
3527 lsdb
= &nbr
->ls_req
;
3529 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3530 table
= lsdb
->type
[i
].db
;
3531 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3532 if ((lsa
= (rn
->info
)) != NULL
)
3533 if (ospf_make_ls_req_func(s
, &length
, delta
,
3536 route_unlock_node(rn
);
3543 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3547 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3549 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3552 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3555 struct ospf_lsa
*lsa
;
3556 struct listnode
*node
;
3557 uint16_t length
= 0;
3558 unsigned int size_noauth
;
3559 unsigned long delta
= stream_get_endp(s
);
3563 if (IS_DEBUG_OSPF_EVENT
)
3564 zlog_debug("ospf_make_ls_upd: Start");
3566 pp
= stream_get_endp(s
);
3567 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3568 length
+= OSPF_LS_UPD_MIN_SIZE
;
3570 /* Calculate amount of packet usable for data. */
3571 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3573 while ((node
= listhead(update
)) != NULL
) {
3574 struct lsa_header
*lsah
;
3577 if (IS_DEBUG_OSPF_EVENT
)
3578 zlog_debug("ospf_make_ls_upd: List Iteration %d",
3581 lsa
= listgetdata(node
);
3585 /* Will it fit? Minimum it has to fit atleast one */
3586 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3590 /* Keep pointer to LS age. */
3591 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3592 + stream_get_endp(s
));
3594 /* Put LSA to Link State Request. */
3595 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3598 /* each hop must increment an lsa_age by transmit_delay
3599 of OSPF interface */
3600 ls_age
= ls_age_increment(lsa
,
3601 OSPF_IF_PARAM(oi
, transmit_delay
));
3602 lsah
->ls_age
= htons(ls_age
);
3604 length
+= ntohs(lsa
->data
->length
);
3607 list_delete_node(update
, node
);
3608 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3611 /* Now set #LSAs. */
3612 stream_putl_at(s
, pp
, count
);
3614 if (IS_DEBUG_OSPF_EVENT
)
3615 zlog_debug("ospf_make_ls_upd: Stop");
3619 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3622 struct listnode
*node
, *nnode
;
3623 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3624 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3625 struct ospf_lsa
*lsa
;
3627 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3630 /* LS Ack packet overflows interface MTU
3631 * delta is just number of bytes required for
3632 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3633 * the number of bytes can be accomodated without
3634 * ospf header. So length+delta can be compared
3635 * against ospf_packet_max to check if it can fit
3636 * another ls header in the same packet.
3638 if ((length
+ delta
) > ospf_packet_max(oi
))
3641 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3642 length
+= OSPF_LSA_HEADER_SIZE
;
3644 listnode_delete(ack
, lsa
);
3645 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3651 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3653 struct ospf_packet
*op
;
3654 uint16_t length
= OSPF_HEADER_SIZE
;
3656 op
= ospf_packet_new(oi
->ifp
->mtu
);
3658 /* Prepare OSPF common header. */
3659 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3661 /* Prepare OSPF Hello body. */
3662 length
+= ospf_make_hello(oi
, op
->s
);
3663 if (length
== OSPF_HEADER_SIZE
) {
3664 /* Hello overshooting MTU */
3665 ospf_packet_free(op
);
3669 /* Fill OSPF header. */
3670 ospf_fill_header(oi
, op
->s
, length
);
3672 /* Set packet length. */
3673 op
->length
= length
;
3675 op
->dst
.s_addr
= addr
;
3677 if (IS_DEBUG_OSPF_EVENT
) {
3678 if (oi
->ospf
->vrf_id
)
3680 "%s: Hello Tx interface %s ospf vrf %s id %u",
3681 __PRETTY_FUNCTION__
, oi
->ifp
->name
,
3682 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3685 /* Add packet to the top of the interface output queue, so that they
3686 * can't get delayed by things like long queues of LS Update packets
3688 ospf_packet_add_top(oi
, op
);
3690 /* Hook thread to write packet. */
3691 OSPF_ISM_WRITE_ON(oi
->ospf
);
3694 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3696 struct ospf_interface
*oi
;
3701 /* If this is passive interface, do not send OSPF Hello. */
3702 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3705 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3708 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3711 if (PRIORITY(oi
) == 0)
3714 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3715 && oi
->state
!= ISM_Backup
)
3718 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3721 int ospf_poll_timer(struct thread
*thread
)
3723 struct ospf_nbr_nbma
*nbr_nbma
;
3725 nbr_nbma
= THREAD_ARG(thread
);
3726 nbr_nbma
->t_poll
= NULL
;
3728 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3729 zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)",
3730 IF_NAME(nbr_nbma
->oi
), inet_ntoa(nbr_nbma
->addr
));
3732 ospf_poll_send(nbr_nbma
);
3734 if (nbr_nbma
->v_poll
> 0)
3735 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3742 int ospf_hello_reply_timer(struct thread
*thread
)
3744 struct ospf_neighbor
*nbr
;
3746 nbr
= THREAD_ARG(thread
);
3747 nbr
->t_hello_reply
= NULL
;
3751 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3752 zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)",
3753 IF_NAME(nbr
->oi
), inet_ntoa(nbr
->router_id
));
3755 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3760 /* Send OSPF Hello. */
3761 void ospf_hello_send(struct ospf_interface
*oi
)
3763 /* If this is passive interface, do not send OSPF Hello. */
3764 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3767 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3768 struct ospf_neighbor
*nbr
;
3769 struct route_node
*rn
;
3771 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3772 if ((nbr
= rn
->info
))
3773 if (nbr
!= oi
->nbr_self
)
3774 if (nbr
->state
!= NSM_Down
) {
3775 /* RFC 2328 Section 9.5.1
3776 If the router is not
3777 eligible to become Designated
3779 it must periodically send
3780 Hello Packets to both the
3781 Designated Router and the
3782 Backup Designated Router (if
3785 if (PRIORITY(oi
) == 0
3796 /* If the router is eligible to
3797 become Designated Router, it
3798 must periodically send Hello
3799 Packets to all neighbors that
3800 are also eligible. In
3801 addition, if the router is
3803 Designated Router or Backup
3804 Designated Router, it must
3806 send periodic Hello Packets
3807 to all other neighbors. */
3809 if (nbr
->priority
== 0
3810 && oi
->state
== ISM_DROther
)
3812 /* if oi->state == Waiting, send
3813 * hello to all neighbors */
3814 ospf_hello_send_sub(
3816 nbr
->address
.u
.prefix4
3820 /* Decide destination address. */
3821 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3822 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3824 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3828 /* Send OSPF Database Description. */
3829 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3831 struct ospf_interface
*oi
;
3832 struct ospf_packet
*op
;
3833 uint16_t length
= OSPF_HEADER_SIZE
;
3836 op
= ospf_packet_new(oi
->ifp
->mtu
);
3838 /* Prepare OSPF common header. */
3839 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3841 /* Prepare OSPF Database Description body. */
3842 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3844 /* Fill OSPF header. */
3845 ospf_fill_header(oi
, op
->s
, length
);
3847 /* Set packet length. */
3848 op
->length
= length
;
3850 /* Decide destination address. */
3851 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3852 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3854 op
->dst
= nbr
->address
.u
.prefix4
;
3856 /* Add packet to the interface output queue. */
3857 ospf_packet_add(oi
, op
);
3859 /* Hook thread to write packet. */
3860 OSPF_ISM_WRITE_ON(oi
->ospf
);
3862 /* Remove old DD packet, then copy new one and keep in neighbor
3865 ospf_packet_free(nbr
->last_send
);
3866 nbr
->last_send
= ospf_packet_dup(op
);
3867 monotime(&nbr
->last_send_ts
);
3868 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3870 "%s:Packet[DD]: %s DB Desc send with seqnum:%x , flags:%x",
3871 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
3872 inet_ntoa(nbr
->router_id
), nbr
->dd_seqnum
,
3876 /* Re-send Database Description. */
3877 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3879 struct ospf_interface
*oi
;
3883 /* Add packet to the interface output queue. */
3884 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3886 /* Hook thread to write packet. */
3887 OSPF_ISM_WRITE_ON(oi
->ospf
);
3888 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3890 "%s:Packet[DD]: %s DB Desc resend with seqnum:%x , flags:%x",
3891 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
3892 inet_ntoa(nbr
->router_id
), nbr
->dd_seqnum
,
3896 /* Send Link State Request. */
3897 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3899 struct ospf_interface
*oi
;
3900 struct ospf_packet
*op
;
3901 uint16_t length
= OSPF_HEADER_SIZE
;
3904 op
= ospf_packet_new(oi
->ifp
->mtu
);
3906 /* Prepare OSPF common header. */
3907 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3909 /* Prepare OSPF Link State Request body. */
3910 length
+= ospf_make_ls_req(nbr
, op
->s
);
3911 if (length
== OSPF_HEADER_SIZE
) {
3912 ospf_packet_free(op
);
3916 /* Fill OSPF header. */
3917 ospf_fill_header(oi
, op
->s
, length
);
3919 /* Set packet length. */
3920 op
->length
= length
;
3922 /* Decide destination address. */
3923 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3924 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3926 op
->dst
= nbr
->address
.u
.prefix4
;
3928 /* Add packet to the interface output queue. */
3929 ospf_packet_add(oi
, op
);
3931 /* Hook thread to write packet. */
3932 OSPF_ISM_WRITE_ON(oi
->ospf
);
3934 /* Add Link State Request Retransmission Timer. */
3935 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3938 /* Send Link State Update with an LSA. */
3939 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3942 struct list
*update
;
3944 update
= list_new();
3946 listnode_add(update
, lsa
);
3948 /*ospf instance is going down, send self originated
3949 * MAXAGE LSA update to neighbors to remove from LSDB */
3950 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3951 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3953 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3955 list_delete(&update
);
3958 /* Determine size for packet. Must be at least big enough to accomodate next
3959 * LSA on list, which may be bigger than MTU size.
3961 * Return pointer to new ospf_packet
3962 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3963 * on packet sizes (in which case offending LSA is deleted from update list)
3965 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3966 struct ospf_interface
*oi
)
3968 struct ospf_lsa
*lsa
;
3969 struct listnode
*ln
;
3971 static char warned
= 0;
3973 lsa
= listgetdata((ln
= listhead(update
)));
3976 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3977 > ospf_packet_max(oi
)) {
3981 "ospf_ls_upd_packet_new: oversized LSA encountered!"
3982 "will need to fragment. Not optimal. Try divide up"
3983 " your network with areas. Use 'debug ospf packet send'"
3984 " to see details, or look at 'show ip ospf database ..'");
3988 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3990 "ospf_ls_upd_packet_new: oversized LSA id:%s,"
3991 " %d bytes originated by %s, will be fragmented!",
3992 inet_ntoa(lsa
->data
->id
),
3993 ntohs(lsa
->data
->length
),
3994 inet_ntoa(lsa
->data
->adv_router
));
3997 * Allocate just enough to fit this LSA only, to avoid including
3999 * LSAs in fragmented LSA Updates.
4001 size
= ntohs(lsa
->data
->length
)
4002 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
4003 + OSPF_LS_UPD_MIN_SIZE
;
4005 size
= oi
->ifp
->mtu
;
4007 if (size
> OSPF_MAX_PACKET_SIZE
) {
4008 flog_warn(EC_OSPF_LARGE_LSA
,
4009 "ospf_ls_upd_packet_new: oversized LSA id:%s too big,"
4010 " %d bytes, packet size %ld, dropping it completely."
4011 " OSPF routing is broken!",
4012 inet_ntoa(lsa
->data
->id
), ntohs(lsa
->data
->length
),
4014 list_delete_node(update
, ln
);
4018 /* IP header is built up separately by ospf_write(). This means, that we
4020 * reduce the "affordable" size just calculated by length of an IP
4022 * This makes sure, that even if we manage to fill the payload with LSA
4024 * completely, the final packet (our data plus IP header) still fits
4026 * outgoing interface MTU. This correction isn't really meaningful for
4028 * oversized LSA, but for consistency the correction is done for both
4031 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
4033 return ospf_packet_new(size
- sizeof(struct ip
));
4036 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
4037 struct list
*update
, struct in_addr addr
,
4040 struct ospf_packet
*op
;
4041 uint16_t length
= OSPF_HEADER_SIZE
;
4043 if (IS_DEBUG_OSPF_EVENT
)
4044 zlog_debug("listcount = %d, [%s]dst %s", listcount(update
),
4045 IF_NAME(oi
), inet_ntoa(addr
));
4047 /* Check that we have really something to process */
4048 if (listcount(update
) == 0)
4051 op
= ospf_ls_upd_packet_new(update
, oi
);
4053 /* Prepare OSPF common header. */
4054 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4056 /* Prepare OSPF Link State Update body.
4057 * Includes Type-7 translation.
4059 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4061 /* Fill OSPF header. */
4062 ospf_fill_header(oi
, op
->s
, length
);
4064 /* Set packet length. */
4065 op
->length
= length
;
4067 /* Decide destination address. */
4068 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4069 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4071 op
->dst
.s_addr
= addr
.s_addr
;
4073 /* Add packet to the interface output queue. */
4074 ospf_packet_add(oi
, op
);
4075 /* Call ospf_write() right away to send ospf packets to neighbors */
4076 if (send_lsupd_now
) {
4077 struct thread os_packet_thd
;
4079 os_packet_thd
.arg
= (void *)oi
->ospf
;
4080 if (oi
->on_write_q
== 0) {
4081 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4084 ospf_write(&os_packet_thd
);
4086 * We are fake calling ospf_write with a fake
4087 * thread. Imagine that we have oi_a already
4088 * enqueued and we have turned on the write
4090 * Now this function calls this for oi_b
4091 * so the on_write_q has oi_a and oi_b on
4092 * it, ospf_write runs and clears the packets
4093 * for both oi_a and oi_b. Removing them from
4094 * the on_write_q. After this thread of execution
4095 * finishes we will execute the t_write thread
4096 * with nothing in the on_write_q causing an
4097 * assert. So just make sure that the t_write
4098 * is actually turned off.
4100 if (list_isempty(oi
->ospf
->oi_write_q
))
4101 OSPF_TIMER_OFF(oi
->ospf
->t_write
);
4103 /* Hook thread to write packet. */
4104 OSPF_ISM_WRITE_ON(oi
->ospf
);
4108 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
4110 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4111 struct route_node
*rn
;
4112 struct route_node
*rnext
;
4113 struct list
*update
;
4116 oi
->t_ls_upd_event
= NULL
;
4118 if (IS_DEBUG_OSPF_EVENT
)
4119 zlog_debug("ospf_ls_upd_send_queue start");
4121 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4122 rnext
= route_next(rn
);
4124 if (rn
->info
== NULL
)
4127 update
= (struct list
*)rn
->info
;
4129 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4131 /* list might not be empty. */
4132 if (listcount(update
) == 0) {
4133 list_delete((struct list
**)&rn
->info
);
4134 route_unlock_node(rn
);
4140 if (IS_DEBUG_OSPF_EVENT
)
4142 "ospf_ls_upd_send_queue: update lists not cleared,"
4143 " %d nodes to try again, raising new event",
4145 oi
->t_ls_upd_event
= NULL
;
4146 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4147 &oi
->t_ls_upd_event
);
4150 if (IS_DEBUG_OSPF_EVENT
)
4151 zlog_debug("ospf_ls_upd_send_queue stop");
4156 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4159 struct ospf_interface
*oi
;
4160 struct ospf_lsa
*lsa
;
4161 struct prefix_ipv4 p
;
4162 struct route_node
*rn
;
4163 struct listnode
*node
;
4168 p
.prefixlen
= IPV4_MAX_BITLEN
;
4170 /* Decide destination address. */
4171 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4172 p
.prefix
= oi
->vl_data
->peer_addr
;
4173 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4174 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4175 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4176 p
.prefix
= nbr
->address
.u
.prefix4
;
4177 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4178 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4179 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4180 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4182 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4184 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4185 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4188 "* LS-Update is directly sent on NBMA network.");
4189 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4190 flog_warn(EC_OSPF_PACKET
,
4191 "* LS-Update is sent to myself.");
4194 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4196 if (rn
->info
== NULL
)
4197 rn
->info
= list_new();
4199 route_unlock_node(rn
);
4201 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4202 listnode_add(rn
->info
,
4203 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4204 if (send_lsupd_now
) {
4205 struct list
*send_update_list
;
4206 struct route_node
*rnext
;
4208 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4209 rnext
= route_next(rn
);
4211 if (rn
->info
== NULL
)
4214 send_update_list
= (struct list
*)rn
->info
;
4216 ospf_ls_upd_queue_send(oi
, send_update_list
,
4217 rn
->p
.u
.prefix4
, 1);
4220 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4221 &oi
->t_ls_upd_event
);
4224 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4227 struct ospf_packet
*op
;
4228 uint16_t length
= OSPF_HEADER_SIZE
;
4230 op
= ospf_packet_new(oi
->ifp
->mtu
);
4232 /* Prepare OSPF common header. */
4233 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4235 /* Prepare OSPF Link State Acknowledgment body. */
4236 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4238 /* Fill OSPF header. */
4239 ospf_fill_header(oi
, op
->s
, length
);
4241 /* Set packet length. */
4242 op
->length
= length
;
4244 /* Decide destination address. */
4245 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4246 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4248 op
->dst
.s_addr
= dst
.s_addr
;
4250 /* Add packet to the interface output queue. */
4251 ospf_packet_add(oi
, op
);
4253 /* Hook thread to write packet. */
4254 OSPF_ISM_WRITE_ON(oi
->ospf
);
4257 static int ospf_ls_ack_send_event(struct thread
*thread
)
4259 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4261 oi
->t_ls_ack_direct
= NULL
;
4263 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4264 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4265 oi
->ls_ack_direct
.dst
);
4270 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4272 struct ospf_interface
*oi
= nbr
->oi
;
4274 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4275 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4277 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4279 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4280 &oi
->t_ls_ack_direct
);
4283 /* Send Link State Acknowledgment delayed. */
4284 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4288 /* Decide destination address. */
4289 /* RFC2328 Section 13.5 On non-broadcast
4290 networks, delayed Link State Acknowledgment packets must be
4291 unicast separately over each adjacency (i.e., neighbor whose
4292 state is >= Exchange). */
4293 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4294 struct ospf_neighbor
*nbr
;
4295 struct route_node
*rn
;
4297 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4298 if ((nbr
= rn
->info
) != NULL
)
4299 if (nbr
!= oi
->nbr_self
4300 && nbr
->state
>= NSM_Exchange
)
4301 while (listcount(oi
->ls_ack
))
4302 ospf_ls_ack_send_list(
4304 nbr
->address
.u
.prefix4
);
4307 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4308 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4309 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4310 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4311 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4312 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4313 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4314 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4316 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4318 while (listcount(oi
->ls_ack
))
4319 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4323 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4324 * address. As a result, the kernel does not need to learn the interface
4325 * MAC of the OSPF neighbor. However, in our world, this will delay
4326 * convergence. Take the case when due to a link flap, all routes now
4327 * want to use an interface which was deemed to be costlier prior to this
4328 * event. For routes that will be installed, the missing MAC will have
4329 * punt-to-CPU set on them. This may overload the CPU control path that
4330 * can be avoided if the MAC was known apriori.
4332 #define OSPF_PING_NBR_STR_MAX (BUFSIZ)
4333 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4335 char ping_nbr
[OSPF_PING_NBR_STR_MAX
];
4338 if (!nbr
|| !nbr
->oi
|| !nbr
->oi
->ifp
)
4341 snprintf(ping_nbr
, sizeof(ping_nbr
),
4342 "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr
->oi
->ifp
->name
,
4343 inet_ntoa(nbr
->address
.u
.prefix4
));
4345 ret
= system(ping_nbr
);
4346 if (IS_DEBUG_OSPF_EVENT
)
4347 zlog_debug("Executed %s %s", ping_nbr
,
4348 ((ret
== 0) ? "successfully" : "but failed"));