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
));
617 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
619 "-----------------IP Header Dump----------------------");
620 ospf_ip_header_dump(iph
);
622 "-----------------------------------------------------");
626 iph
->ip_off
+= offset
;
627 stream_forward_getp(op
->s
, iovp
->iov_len
);
628 iovp
->iov_base
= stream_pnt(op
->s
);
631 /* setup for final fragment */
632 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
633 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
634 iph
->ip_off
&= (~IP_MF
);
636 #endif /* WANT_OSPF_WRITE_FRAGMENT */
638 static int ospf_write(struct thread
*thread
)
640 struct ospf
*ospf
= THREAD_ARG(thread
);
641 struct ospf_interface
*oi
;
642 struct ospf_interface
*last_serviced_oi
= NULL
;
643 struct ospf_packet
*op
;
644 struct sockaddr_in sa_dst
;
651 struct listnode
*node
;
652 #ifdef WANT_OSPF_WRITE_FRAGMENT
653 static uint16_t ipid
= 0;
654 uint16_t maxdatasize
;
655 #endif /* WANT_OSPF_WRITE_FRAGMENT */
656 #define OSPF_WRITE_IPHL_SHIFT 2
660 unsigned char cmsgbuf
[64] = {};
661 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
662 struct in_pktinfo
*pi
;
665 if (ospf
->fd
< 0 || ospf
->oi_running
== 0) {
666 if (IS_DEBUG_OSPF_EVENT
)
668 "ospf_write failed to send, fd %d, instance %u"
669 ,ospf
->fd
, ospf
->oi_running
);
673 node
= listhead(ospf
->oi_write_q
);
675 oi
= listgetdata(node
);
677 #ifdef WANT_OSPF_WRITE_FRAGMENT
678 /* seed ipid static with low order bits of time */
680 ipid
= (time(NULL
) & 0xffff);
681 #endif /* WANT_OSPF_WRITE_FRAGMENT */
683 while ((pkt_count
< ospf
->write_oi_count
) && oi
684 && (last_serviced_oi
!= oi
)) {
685 /* If there is only packet in the queue, the oi is removed from
686 write-q, so fix up the last interface that was serviced */
687 if (last_serviced_oi
== NULL
) {
688 last_serviced_oi
= oi
;
691 #ifdef WANT_OSPF_WRITE_FRAGMENT
692 /* convenience - max OSPF data per packet */
693 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
694 #endif /* WANT_OSPF_WRITE_FRAGMENT */
695 /* Get one packet from queue. */
696 op
= ospf_fifo_head(oi
->obuf
);
698 assert(op
->length
>= OSPF_HEADER_SIZE
);
700 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
701 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
702 ospf_if_ipmulticast(ospf
, oi
->address
,
705 /* Rewrite the md5 signature & update the seq */
706 ospf_make_md5_digest(oi
, op
);
708 /* Retrieve OSPF packet type. */
709 stream_set_getp(op
->s
, 1);
710 type
= stream_getc(op
->s
);
712 /* reset get pointer */
713 stream_set_getp(op
->s
, 0);
715 memset(&iph
, 0, sizeof(struct ip
));
716 memset(&sa_dst
, 0, sizeof(sa_dst
));
718 sa_dst
.sin_family
= AF_INET
;
719 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
720 sa_dst
.sin_len
= sizeof(sa_dst
);
721 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
722 sa_dst
.sin_addr
= op
->dst
;
723 sa_dst
.sin_port
= htons(0);
725 /* Set DONTROUTE flag if dst is unicast. */
726 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
727 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
728 flags
= MSG_DONTROUTE
;
730 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
731 /* it'd be very strange for header to not be 4byte-word aligned
733 if (sizeof(struct ip
)
734 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
735 iph
.ip_hl
++; /* we presume sizeof struct ip cant
738 iph
.ip_v
= IPVERSION
;
739 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
740 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
742 #if defined(__DragonFly__)
744 * DragonFly's raw socket expects ip_len/ip_off in network byte
747 iph
.ip_len
= htons(iph
.ip_len
);
750 #ifdef WANT_OSPF_WRITE_FRAGMENT
751 /* XXX-MT: not thread-safe at all..
752 * XXX: this presumes this is only programme sending OSPF
754 * otherwise, no guarantee ipid will be unique
757 #endif /* WANT_OSPF_WRITE_FRAGMENT */
760 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
761 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
763 iph
.ip_ttl
= OSPF_IP_TTL
;
764 iph
.ip_p
= IPPROTO_OSPFIGP
;
766 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
767 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
769 memset(&msg
, 0, sizeof(msg
));
770 msg
.msg_name
= (caddr_t
)&sa_dst
;
771 msg
.msg_namelen
= sizeof(sa_dst
);
775 iov
[0].iov_base
= (char *)&iph
;
776 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
777 iov
[1].iov_base
= stream_pnt(op
->s
);
778 iov
[1].iov_len
= op
->length
;
781 msg
.msg_control
= (caddr_t
)cm
;
782 cm
->cmsg_level
= SOL_IP
;
783 cm
->cmsg_type
= IP_PKTINFO
;
784 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
785 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
786 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
788 msg
.msg_controllen
= cm
->cmsg_len
;
791 /* Sadly we can not rely on kernels to fragment packets
792 * because of either IP_HDRINCL and/or multicast
793 * destination being set.
796 #ifdef WANT_OSPF_WRITE_FRAGMENT
797 if (op
->length
> maxdatasize
)
798 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
799 oi
->ifp
->mtu
, flags
, type
);
800 #endif /* WANT_OSPF_WRITE_FRAGMENT */
802 /* send final fragment (could be first) */
803 sockopt_iphdrincl_swab_htosys(&iph
);
804 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
805 sockopt_iphdrincl_swab_systoh(&iph
);
806 if (IS_DEBUG_OSPF_EVENT
)
809 "id %d, off %d, len %d, interface %s, mtu %u:",
810 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
811 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
816 "*** sendmsg in ospf_write failed to %s, "
817 "id %d, off %d, len %d, interface %s, mtu %u: %s",
818 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
819 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
820 safe_strerror(errno
));
822 /* Show debug sending packet. */
823 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
824 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
826 "-----------------------------------------------------");
827 ospf_ip_header_dump(&iph
);
828 stream_set_getp(op
->s
, 0);
829 ospf_packet_dump(op
->s
);
832 zlog_debug("%s sent to [%s] via [%s].",
833 lookup_msg(ospf_packet_type_str
, type
, NULL
),
834 inet_ntoa(op
->dst
), IF_NAME(oi
));
836 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
838 "-----------------------------------------------------");
845 case OSPF_MSG_DB_DESC
:
848 case OSPF_MSG_LS_REQ
:
851 case OSPF_MSG_LS_UPD
:
854 case OSPF_MSG_LS_ACK
:
861 /* Now delete packet from queue. */
862 ospf_packet_delete(oi
);
864 /* Move this interface to the tail of write_q to
865 serve everyone in a round robin fashion */
866 list_delete_node(ospf
->oi_write_q
, node
);
867 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
869 last_serviced_oi
= NULL
;
872 listnode_add(ospf
->oi_write_q
, oi
);
875 /* Setup to service from the head of the queue again */
876 if (!list_isempty(ospf
->oi_write_q
)) {
877 node
= listhead(ospf
->oi_write_q
);
878 oi
= listgetdata(node
);
882 /* If packets still remain in queue, call write thread. */
883 if (!list_isempty(ospf
->oi_write_q
))
884 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
890 /* OSPF Hello message read -- RFC2328 Section 10.5. */
891 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
892 struct stream
*s
, struct ospf_interface
*oi
, int size
)
894 struct ospf_hello
*hello
;
895 struct ospf_neighbor
*nbr
;
899 /* increment statistics. */
902 hello
= (struct ospf_hello
*)stream_pnt(s
);
904 /* If Hello is myself, silently discard. */
905 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
906 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
908 "ospf_header[%s/%s]: selforiginated, "
910 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
912 inet_ntoa(iph
->ip_src
));
917 /* get neighbor prefix. */
919 p
.prefixlen
= ip_masklen(hello
->network_mask
);
920 p
.u
.prefix4
= iph
->ip_src
;
922 /* Compare network mask. */
923 /* Checking is ignored for Point-to-Point and Virtual link. */
924 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
925 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
926 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
929 "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
930 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
),
931 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
935 /* Compare Router Dead Interval. */
936 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
937 flog_warn(EC_OSPF_PACKET
,
938 "Packet %s [Hello:RECV]: RouterDeadInterval mismatch "
939 "(expected %u, but received %u).",
940 inet_ntoa(ospfh
->router_id
),
941 OSPF_IF_PARAM(oi
, v_wait
),
942 ntohl(hello
->dead_interval
));
946 /* Compare Hello Interval - ignored if fast-hellos are set. */
947 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
948 if (OSPF_IF_PARAM(oi
, v_hello
)
949 != ntohs(hello
->hello_interval
)) {
952 "Packet %s [Hello:RECV]: HelloInterval mismatch "
953 "(expected %u, but received %u).",
954 inet_ntoa(ospfh
->router_id
),
955 OSPF_IF_PARAM(oi
, v_hello
),
956 ntohs(hello
->hello_interval
));
961 if (IS_DEBUG_OSPF_EVENT
)
962 zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s",
963 inet_ntoa(ospfh
->router_id
),
964 ospf_options_dump(hello
->options
),
965 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
967 /* Compare options. */
968 #define REJECT_IF_TBIT_ON 1 /* XXX */
969 #ifdef REJECT_IF_TBIT_ON
970 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
972 * This router does not support non-zero TOS.
973 * Drop this Hello packet not to establish neighbor
976 flog_warn(EC_OSPF_PACKET
,
977 "Packet %s [Hello:RECV]: T-bit on, drop it.",
978 inet_ntoa(ospfh
->router_id
));
981 #endif /* REJECT_IF_TBIT_ON */
983 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
984 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
986 * This router does know the correct usage of O-bit
987 * the bit should be set in DD packet only.
989 flog_warn(EC_OSPF_PACKET
,
990 "Packet %s [Hello:RECV]: O-bit abuse?",
991 inet_ntoa(ospfh
->router_id
));
992 #ifdef STRICT_OBIT_USAGE_CHECK
993 return; /* Reject this packet. */
994 #else /* STRICT_OBIT_USAGE_CHECK */
995 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
996 #endif /* STRICT_OBIT_USAGE_CHECK */
999 /* new for NSSA is to ensure that NP is on and E is off */
1001 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
1002 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
1003 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
1004 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1005 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
1008 "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x",
1009 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1013 if (IS_DEBUG_OSPF_NSSA
)
1014 zlog_debug("NSSA-Hello:RECV:Packet from %s:",
1015 inet_ntoa(ospfh
->router_id
));
1017 /* The setting of the E-bit found in the Hello Packet's Options
1018 field must match this area's ExternalRoutingCapability A
1019 mismatch causes processing to stop and the packet to be
1020 dropped. The setting of the rest of the bits in the Hello
1021 Packet's Options field should be ignored. */
1022 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1023 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1026 "Packet %s [Hello:RECV]: my options: %x, his options %x",
1027 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1032 /* get neighbour struct */
1033 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1035 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1038 old_state
= nbr
->state
;
1040 /* Add event to thread. */
1041 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1043 /* RFC2328 Section 9.5.1
1044 If the router is not eligible to become Designated Router,
1045 (snip) It must also send an Hello Packet in reply to an
1046 Hello Packet received from any eligible neighbor (other than
1047 the current Designated Router and Backup Designated Router). */
1048 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1049 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1050 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1051 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1052 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1053 ospf_hello_reply_timer
,
1054 OSPF_HELLO_REPLY_DELAY
);
1056 /* on NBMA network type, it happens to receive bidirectional Hello
1058 without advance 1-Way Received event.
1059 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1060 if (oi
->type
== OSPF_IFTYPE_NBMA
1061 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1062 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1063 nbr
->priority
= hello
->priority
;
1064 nbr
->d_router
= hello
->d_router
;
1065 nbr
->bd_router
= hello
->bd_router
;
1069 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1070 size
- OSPF_HELLO_MIN_SIZE
)) {
1071 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1072 nbr
->options
|= hello
->options
;
1074 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1075 /* Set neighbor information. */
1076 nbr
->priority
= hello
->priority
;
1077 nbr
->d_router
= hello
->d_router
;
1078 nbr
->bd_router
= hello
->bd_router
;
1082 /* If neighbor itself declares DR and no BDR exists,
1083 cause event BackupSeen */
1084 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1085 if (hello
->bd_router
.s_addr
== 0 && oi
->state
== ISM_Waiting
)
1086 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1088 /* neighbor itself declares BDR. */
1089 if (oi
->state
== ISM_Waiting
1090 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
))
1091 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1093 /* had not previously. */
1094 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1095 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1096 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1097 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->d_router
)))
1098 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1100 /* had not previously. */
1101 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1102 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1103 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1104 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
)))
1105 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1107 /* Neighbor priority check. */
1108 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1109 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1111 /* Set neighbor information. */
1112 nbr
->priority
= hello
->priority
;
1113 nbr
->d_router
= hello
->d_router
;
1114 nbr
->bd_router
= hello
->bd_router
;
1117 /* Save DD flags/options/Seqnum received. */
1118 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1119 struct ospf_db_desc
*dd
)
1121 nbr
->last_recv
.flags
= dd
->flags
;
1122 nbr
->last_recv
.options
= dd
->options
;
1123 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1126 /* Process rest of DD packet. */
1127 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1128 struct ospf_neighbor
*nbr
,
1129 struct ospf_db_desc
*dd
, uint16_t size
)
1131 struct ospf_lsa
*new, *find
;
1132 struct lsa_header
*lsah
;
1134 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1135 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1136 size
-= OSPF_LSA_HEADER_SIZE
) {
1137 lsah
= (struct lsa_header
*)stream_pnt(s
);
1138 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1140 /* Unknown LS type. */
1141 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1142 flog_warn(EC_OSPF_PACKET
,
1143 "Packet [DD:RECV]: Unknown LS type %d.",
1145 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1149 if (IS_OPAQUE_LSA(lsah
->type
)
1150 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1151 flog_warn(EC_OSPF_PACKET
,
1152 "LSA[Type%d:%s]: Opaque capability mismatch?",
1153 lsah
->type
, inet_ntoa(lsah
->id
));
1154 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1158 switch (lsah
->type
) {
1159 case OSPF_AS_EXTERNAL_LSA
:
1160 case OSPF_OPAQUE_AS_LSA
:
1161 /* Check for stub area. Reject if AS-External from stub
1163 allow if from NSSA. */
1164 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1167 "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.",
1168 lsah
->type
, inet_ntoa(lsah
->id
),
1169 (oi
->area
->external_routing
1173 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1174 NSM_SeqNumberMismatch
);
1182 /* Create LS-request object. */
1183 new = ospf_ls_request_new(lsah
);
1185 /* Lookup received LSA, then add LS request list. */
1186 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1188 /* ospf_lsa_more_recent is fine with NULL pointers */
1189 switch (ospf_lsa_more_recent(find
, new)) {
1191 /* Neighbour has a more recent LSA, we must request it
1193 ospf_ls_request_add(nbr
, new);
1196 /* If we have a copy of this LSA, it's either less
1198 * and we're requesting it from neighbour (the case
1200 * it's as recent and we both have same copy (this
1203 * In neither of these two cases is there any point in
1204 * describing our copy of the LSA to the neighbour in a
1205 * DB-Summary packet, if we're still intending to do so.
1207 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1208 * backward compatible optimisation to OSPF DB Exchange
1210 * DB Description process implemented here.
1213 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1214 ospf_lsa_discard(new);
1217 /* We have the more recent copy, nothing specific to do:
1218 * - no need to request neighbours stale copy
1219 * - must leave DB summary list copy alone
1221 if (IS_DEBUG_OSPF_EVENT
)
1223 "Packet [DD:RECV]: LSA received Type %d, "
1224 "ID %s is not recent.",
1225 lsah
->type
, inet_ntoa(lsah
->id
));
1226 ospf_lsa_discard(new);
1231 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1234 /* Both sides have no More, then we're done with Exchange */
1235 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1236 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1238 ospf_db_desc_send(nbr
);
1242 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1244 /* Send DD packet in reply.
1246 * Must be done to acknowledge the Master's DD, regardless of
1247 * whether we have more LSAs ourselves to describe.
1249 * This function will clear the 'More' bit, if after this DD
1250 * we have no more LSAs to describe to the master..
1252 ospf_db_desc_send(nbr
);
1254 /* Slave can raise ExchangeDone now, if master is also done */
1255 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1256 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1259 /* Save received neighbor values from DD. */
1260 ospf_db_desc_save_current(nbr
, dd
);
1263 ospf_ls_req_send(nbr
);
1266 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1267 struct ospf_neighbor
*nbr
)
1269 /* Is DD duplicated? */
1270 if (dd
->options
== nbr
->last_recv
.options
1271 && dd
->flags
== nbr
->last_recv
.flags
1272 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1278 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1279 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1280 struct stream
*s
, struct ospf_interface
*oi
,
1283 struct ospf_db_desc
*dd
;
1284 struct ospf_neighbor
*nbr
;
1286 /* Increment statistics. */
1289 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1291 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1293 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %s",
1294 inet_ntoa(ospfh
->router_id
));
1299 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1300 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1303 "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u",
1304 inet_ntoa(nbr
->router_id
), ntohs(dd
->mtu
), IF_NAME(oi
),
1310 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1312 * required. In fact at least JunOS sends DD packets with P bit clear.
1313 * Until proper solution is developped, this hack should help.
1315 * Update: According to the RFCs, N bit is specified /only/ for Hello
1316 * options, unfortunately its use in DD options is not specified. Hence
1318 * implementations follow E-bit semantics and set it in DD options, and
1320 * treat it as unspecified and hence follow the directive "default for
1321 * options is clear", ie unset.
1323 * Reset the flag, as ospfd follows E-bit semantics.
1325 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1326 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1327 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1328 if (IS_DEBUG_OSPF_EVENT
)
1330 "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options",
1331 inet_ntoa(nbr
->router_id
));
1332 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1335 #ifdef REJECT_IF_TBIT_ON
1336 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1338 * In Hello protocol, optional capability must have checked
1339 * to prevent this T-bit enabled router be my neighbor.
1341 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %s: T-bit on?",
1342 inet_ntoa(nbr
->router_id
));
1345 #endif /* REJECT_IF_TBIT_ON */
1347 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1348 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1350 * This node is not configured to handle O-bit, for now.
1351 * Clear it to ignore unsupported capability proposed by
1354 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1357 /* Add event to thread. */
1358 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1360 /* Process DD packet by neighbor status. */
1361 switch (nbr
->state
) {
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
, NULL
));
1372 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1373 /* If the new state is ExStart, the processing of the current
1374 packet should then continue in this new state by falling
1375 through to case ExStart below. */
1376 if (nbr
->state
!= NSM_ExStart
)
1381 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1382 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1383 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1385 /* We're Slave---obey */
1386 if (CHECK_FLAG(oi
->ospf
->config
,
1387 OSPF_LOG_ADJACENCY_DETAIL
))
1389 "Packet[DD]: Neighbor %s Negotiation done (Slave).",
1390 inet_ntoa(nbr
->router_id
));
1392 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1395 UNSET_FLAG(nbr
->dd_flags
,
1396 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1398 /* We're Master, ignore the initial DBD from
1400 if (CHECK_FLAG(oi
->ospf
->config
,
1401 OSPF_LOG_ADJACENCY_DETAIL
))
1403 "Packet[DD]: Neighbor %s: Initial DBD from Slave, "
1405 inet_ntoa(nbr
->router_id
));
1409 /* Ack from the Slave */
1410 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1411 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1412 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1415 "Packet[DD]: Neighbor %s Negotiation done (Master).",
1416 inet_ntoa(nbr
->router_id
));
1417 /* Reset I, leaving MS */
1418 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1420 flog_warn(EC_OSPF_PACKET
,
1421 "Packet[DD]: Neighbor %s Negotiation fails.",
1422 inet_ntoa(nbr
->router_id
));
1426 /* This is where the real Options are saved */
1427 nbr
->options
= dd
->options
;
1429 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1430 if (IS_DEBUG_OSPF_EVENT
)
1432 "Neighbor[%s] is %sOpaque-capable.",
1433 inet_ntoa(nbr
->router_id
),
1434 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1438 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1439 && IPV4_ADDR_SAME(&DR(oi
),
1440 &nbr
->address
.u
.prefix4
)) {
1443 "DR-neighbor[%s] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1444 inet_ntoa(nbr
->router_id
));
1445 /* This situation is undesirable, but not a real
1450 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1452 /* continue processing rest of packet. */
1453 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1456 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1457 if (IS_SET_DD_MS(nbr
->dd_flags
))
1458 /* Master: discard duplicated DD packet. */
1460 "Packet[DD] (Master): Neighbor %s packet duplicated.",
1461 inet_ntoa(nbr
->router_id
));
1463 /* Slave: cause to retransmit the last Database
1467 "Packet[DD] [Slave]: Neighbor %s packet duplicated.",
1468 inet_ntoa(nbr
->router_id
));
1469 ospf_db_desc_resend(nbr
);
1474 /* Otherwise DD packet should be checked. */
1475 /* Check Master/Slave bit mismatch */
1476 if (IS_SET_DD_MS(dd
->flags
)
1477 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1478 flog_warn(EC_OSPF_PACKET
,
1479 "Packet[DD]: Neighbor %s MS-bit mismatch.",
1480 inet_ntoa(nbr
->router_id
));
1481 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1482 if (IS_DEBUG_OSPF_EVENT
)
1484 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1485 dd
->flags
, nbr
->dd_flags
);
1489 /* Check initialize bit is set. */
1490 if (IS_SET_DD_I(dd
->flags
)) {
1491 zlog_info("Packet[DD]: Neighbor %s I-bit set.",
1492 inet_ntoa(nbr
->router_id
));
1493 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1497 /* Check DD Options. */
1498 if (dd
->options
!= nbr
->options
) {
1499 #ifdef ORIGINAL_CODING
1500 /* Save the new options for debugging */
1501 nbr
->options
= dd
->options
;
1502 #endif /* ORIGINAL_CODING */
1503 flog_warn(EC_OSPF_PACKET
,
1504 "Packet[DD]: Neighbor %s options mismatch.",
1505 inet_ntoa(nbr
->router_id
));
1506 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1510 /* Check DD sequence number. */
1511 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1512 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1513 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1514 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1517 "Packet[DD]: Neighbor %s sequence number mismatch.",
1518 inet_ntoa(nbr
->router_id
));
1519 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1523 /* Continue processing rest of packet. */
1524 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1528 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1529 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1530 /* Master should discard duplicate DD packet. */
1532 "Packet[DD]: Neighbor %s duplicated, "
1533 "packet discarded.",
1534 inet_ntoa(nbr
->router_id
));
1537 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1538 < nbr
->v_inactivity
* 1000000LL) {
1539 /* In states Loading and Full the slave
1541 its last Database Description packet
1543 duplicate Database Description
1545 from the master. For this reason the
1547 wait RouterDeadInterval seconds
1549 last Database Description packet.
1551 Database Description packet from the
1553 this interval will generate a
1555 neighbor event. RFC2328 Section 10.8
1557 ospf_db_desc_resend(nbr
);
1563 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1566 flog_warn(EC_OSPF_PACKET
,
1567 "Packet[DD]: Neighbor %s NSM illegal status %u.",
1568 inet_ntoa(nbr
->router_id
), nbr
->state
);
1573 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1575 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1576 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1577 struct stream
*s
, struct ospf_interface
*oi
,
1580 struct ospf_neighbor
*nbr
;
1582 struct in_addr ls_id
;
1583 struct in_addr adv_router
;
1584 struct ospf_lsa
*find
;
1585 struct list
*ls_upd
;
1586 unsigned int length
;
1588 /* Increment statistics. */
1591 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1593 flog_warn(EC_OSPF_PACKET
,
1594 "Link State Request: Unknown Neighbor %s.",
1595 inet_ntoa(ospfh
->router_id
));
1599 /* Add event to thread. */
1600 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1602 /* Neighbor State should be Exchange or later. */
1603 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1604 && nbr
->state
!= NSM_Full
) {
1607 "Link State Request received from %s: Neighbor state is %s, packet discarded.",
1608 inet_ntoa(ospfh
->router_id
),
1609 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1613 /* Send Link State Update for ALL requested LSAs. */
1614 ls_upd
= list_new();
1615 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1617 while (size
>= OSPF_LSA_KEY_SIZE
) {
1618 /* Get one slice of Link State Request. */
1619 ls_type
= stream_getl(s
);
1620 ls_id
.s_addr
= stream_get_ipv4(s
);
1621 adv_router
.s_addr
= stream_get_ipv4(s
);
1623 /* Verify LSA type. */
1624 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1625 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1626 list_delete(&ls_upd
);
1630 /* Search proper LSA in LSDB. */
1631 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1634 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1635 list_delete(&ls_upd
);
1639 /* Packet overflows MTU size, send immediately. */
1640 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1641 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1642 ospf_ls_upd_send(nbr
, ls_upd
,
1643 OSPF_SEND_PACKET_DIRECT
, 0);
1645 ospf_ls_upd_send(nbr
, ls_upd
,
1646 OSPF_SEND_PACKET_INDIRECT
, 0);
1648 /* Only remove list contents. Keep ls_upd. */
1649 list_delete_all_node(ls_upd
);
1651 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1654 /* Append LSA to update list. */
1655 listnode_add(ls_upd
, find
);
1656 length
+= ntohs(find
->data
->length
);
1658 size
-= OSPF_LSA_KEY_SIZE
;
1661 /* Send rest of Link State Update. */
1662 if (listcount(ls_upd
) > 0) {
1663 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1664 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1667 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1670 list_delete(&ls_upd
);
1672 list_delete(&ls_upd
);
1675 /* Get the list of LSAs from Link State Update packet.
1676 And process some validation -- RFC2328 Section 13. (1)-(2). */
1677 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1679 struct ospf_interface
*oi
, size_t size
)
1681 uint16_t count
, sum
;
1683 struct lsa_header
*lsah
;
1684 struct ospf_lsa
*lsa
;
1689 count
= stream_getl(s
);
1690 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1692 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1693 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1694 lsah
= (struct lsa_header
*)stream_pnt(s
);
1695 length
= ntohs(lsah
->length
);
1697 if (length
> size
) {
1700 "Link State Update: LSA length exceeds packet size.");
1704 /* Validate the LSA's LS checksum. */
1705 sum
= lsah
->checksum
;
1706 if (!ospf_lsa_checksum_valid(lsah
)) {
1707 /* (bug #685) more details in a one-line message make it
1709 * to identify problem source on the one hand and to
1711 * chance to compress repeated messages in syslog on the
1715 "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s",
1716 sum
, lsah
->checksum
, inet_ntoa(lsah
->id
),
1717 inet_ntoa(nbr
->src
), inet_ntoa(nbr
->router_id
),
1718 inet_ntoa(lsah
->adv_router
));
1722 /* Examine the LSA's LS type. */
1723 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1724 flog_warn(EC_OSPF_PACKET
,
1725 "Link State Update: Unknown LS type %d",
1731 * What if the received LSA's age is greater than MaxAge?
1732 * Treat it as a MaxAge case -- endo.
1734 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1735 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1737 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1738 #ifdef STRICT_OBIT_USAGE_CHECK
1739 if ((IS_OPAQUE_LSA(lsah
->type
)
1740 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1741 || (!IS_OPAQUE_LSA(lsah
->type
)
1742 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1744 * This neighbor must know the exact usage of
1746 * the bit will be set in Type-9,10,11 LSAs
1749 flog_warn(EC_OSPF_PACKET
,
1750 "LSA[Type%d:%s]: O-bit abuse?",
1751 lsah
->type
, inet_ntoa(lsah
->id
));
1754 #endif /* STRICT_OBIT_USAGE_CHECK */
1756 /* Do not take in AS External Opaque-LSAs if we are a
1758 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1759 && nbr
->oi
->area
->external_routing
1760 != OSPF_AREA_DEFAULT
) {
1761 if (IS_DEBUG_OSPF_EVENT
)
1763 "LSA[Type%d:%s]: We are a stub, don't take this LSA.",
1765 inet_ntoa(lsah
->id
));
1768 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1769 flog_warn(EC_OSPF_PACKET
,
1770 "LSA[Type%d:%s]: Opaque capability mismatch?",
1771 lsah
->type
, inet_ntoa(lsah
->id
));
1775 /* Create OSPF LSA instance. */
1776 lsa
= ospf_lsa_new_and_data(length
);
1778 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1779 /* We may wish to put some error checking if type NSSA comes in
1780 and area not in NSSA mode */
1781 switch (lsah
->type
) {
1782 case OSPF_AS_EXTERNAL_LSA
:
1783 case OSPF_OPAQUE_AS_LSA
:
1786 case OSPF_OPAQUE_LINK_LSA
:
1787 lsa
->oi
= oi
; /* Remember incoming interface for
1788 flooding control. */
1791 lsa
->area
= oi
->area
;
1795 memcpy(lsa
->data
, lsah
, length
);
1797 if (IS_DEBUG_OSPF_EVENT
)
1799 "LSA[Type%d:%s]: %p new LSA created with Link State Update",
1800 lsa
->data
->type
, inet_ntoa(lsa
->data
->id
),
1802 listnode_add(lsas
, lsa
);
1808 /* Cleanup Update list. */
1809 static void ospf_upd_list_clean(struct list
*lsas
)
1811 struct listnode
*node
, *nnode
;
1812 struct ospf_lsa
*lsa
;
1814 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1815 ospf_lsa_discard(lsa
);
1820 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1821 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1822 struct ospf_header
*ospfh
, struct stream
*s
,
1823 struct ospf_interface
*oi
, uint16_t size
)
1825 struct ospf_neighbor
*nbr
;
1827 struct listnode
*node
, *nnode
;
1828 struct ospf_lsa
*lsa
= NULL
;
1829 /* unsigned long ls_req_found = 0; */
1831 /* Dis-assemble the stream, update each entry, re-encapsulate for
1834 /* Increment statistics. */
1837 /* Check neighbor. */
1838 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1840 flog_warn(EC_OSPF_PACKET
,
1841 "Link State Update: Unknown Neighbor %s on int: %s",
1842 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
1846 /* Add event to thread. */
1847 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1849 /* Check neighbor state. */
1850 if (nbr
->state
< NSM_Exchange
) {
1851 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1853 "Link State Update: "
1854 "Neighbor[%s] state %s is less than Exchange",
1855 inet_ntoa(ospfh
->router_id
),
1856 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1861 /* Get list of LSAs from Link State Update packet. - Also perorms Stages
1862 * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
1865 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1869 #define DISCARD_LSA(L, N) \
1871 if (IS_DEBUG_OSPF_EVENT) \
1873 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1875 N, (void *)lsa, (int)lsa->data->type); \
1876 ospf_lsa_discard(L); \
1880 /* Process each LSA received in the one packet.
1882 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1883 * text below are from the steps in RFC 2328, Section 13.
1885 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1886 struct ospf_lsa
*ls_ret
, *current
;
1889 if (IS_DEBUG_OSPF_NSSA
) {
1890 char buf1
[INET_ADDRSTRLEN
];
1891 char buf2
[INET_ADDRSTRLEN
];
1892 char buf3
[INET_ADDRSTRLEN
];
1894 zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s",
1896 inet_ntop(AF_INET
, &ospfh
->router_id
, buf1
,
1898 inet_ntop(AF_INET
, &lsa
->data
->id
, buf2
,
1900 inet_ntop(AF_INET
, &lsa
->data
->adv_router
,
1901 buf3
, INET_ADDRSTRLEN
));
1904 listnode_delete(lsas
,
1905 lsa
); /* We don't need it in list anymore */
1907 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1910 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1912 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1915 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1918 /* Do take in Type-7's if we are an NSSA */
1920 /* If we are also an ABR, later translate them to a Type-5
1923 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1924 translate them to a separate Type-5 packet. */
1926 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1927 /* Reject from STUB or NSSA */
1928 if (nbr
->oi
->area
->external_routing
1929 != OSPF_AREA_DEFAULT
) {
1930 if (IS_DEBUG_OSPF_NSSA
)
1932 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1933 DISCARD_LSA(lsa
, 1);
1936 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1937 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1938 if (IS_DEBUG_OSPF_NSSA
)
1940 "Incoming NSSA LSA Discarded: Not NSSA Area");
1941 DISCARD_LSA(lsa
, 2);
1944 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1945 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1946 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1947 &lsa
->data
->adv_router
)) {
1948 char buf1
[INET_ADDRSTRLEN
];
1949 char buf2
[INET_ADDRSTRLEN
];
1950 char buf3
[INET_ADDRSTRLEN
];
1952 flog_err(EC_OSPF_ROUTER_LSA_MISMATCH
,
1953 "Incoming Router-LSA from %s with "
1954 "Adv-ID[%s] != LS-ID[%s]",
1955 inet_ntop(AF_INET
, &ospfh
->router_id
,
1956 buf1
, INET_ADDRSTRLEN
),
1957 inet_ntop(AF_INET
, &lsa
->data
->id
,
1958 buf2
, INET_ADDRSTRLEN
),
1960 &lsa
->data
->adv_router
, buf3
,
1963 EC_OSPF_DOMAIN_CORRUPT
,
1964 "OSPF domain compromised by attack or corruption. "
1965 "Verify correct operation of -ALL- OSPF routers.");
1966 DISCARD_LSA(lsa
, 0);
1969 /* Find the LSA in the current database. */
1971 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1973 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1975 no instance of the LSA in the router's link state database,
1976 and none of router's neighbors are in states Exchange or
1978 then take the following actions: */
1980 if (IS_LSA_MAXAGE(lsa
) && !current
1981 && ospf_check_nbr_status(oi
->ospf
)) {
1982 /* (4a) Response Link State Acknowledgment. */
1983 ospf_ls_ack_send(nbr
, lsa
);
1985 /* (4b) Discard LSA. */
1986 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1988 "Link State Update[%s]: LS age is equal to MaxAge.",
1991 DISCARD_LSA(lsa
, 3);
1994 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1995 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1996 &oi
->ospf
->router_id
)) {
1998 * Even if initial flushing seems to be completed, there
2000 * be a case that self-originated LSA with MaxAge still
2002 * in the routing domain.
2003 * Just send an LSAck message to cease retransmission.
2005 if (IS_LSA_MAXAGE(lsa
)) {
2006 zlog_info("LSA[%s]: Boomerang effect?",
2008 ospf_ls_ack_send(nbr
, lsa
);
2009 ospf_lsa_discard(lsa
);
2011 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2012 ospf_opaque_lsa_refresh_schedule(
2018 * If an instance of self-originated Opaque-LSA is not
2020 * in the LSDB, there are some possible cases here.
2022 * 1) This node lost opaque-capability after restart.
2023 * 2) Else, a part of opaque-type is no more supported.
2024 * 3) Else, a part of opaque-id is no more supported.
2026 * Anyway, it is still this node's responsibility to
2028 * Otherwise, the LSA instance remains in the routing
2030 * until its age reaches to MaxAge.
2032 /* XXX: We should deal with this for *ALL* LSAs, not
2034 if (current
== NULL
) {
2035 if (IS_DEBUG_OSPF_EVENT
)
2037 "LSA[%s]: Previously originated Opaque-LSA,"
2038 "not found in the LSDB.",
2041 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2043 ospf_opaque_self_originated_lsa_received(nbr
,
2045 ospf_ls_ack_send(nbr
, lsa
);
2051 /* It might be happen that received LSA is self-originated
2053 * router ID is changed. So, we should check if LSA is a
2055 * Link State ID is one of the router's own IP interface
2056 * addresses but whose
2057 * Advertising Router is not equal to the router's own Router ID
2058 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2062 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2063 struct listnode
*oinode
, *oinnode
;
2064 struct ospf_interface
*out_if
;
2067 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2072 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2074 && (!(IPV4_ADDR_SAME(
2075 &oi
->ospf
->router_id
,
2076 &lsa
->data
->adv_router
)))) {
2077 if (out_if
->network_lsa_self
) {
2078 ospf_lsa_flush_area(
2080 if (IS_DEBUG_OSPF_EVENT
)
2082 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2086 ospf_lsa_discard(lsa
);
2096 /* (5) Find the instance of this LSA that is currently contained
2097 in the router's link state database. If there is no
2098 database copy, or the received LSA is more recent than
2099 the database copy the following steps must be performed.
2100 (The sub steps from RFC 2328 section 13 step (5) will be
2105 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2107 if (current
&& (lsa
->data
->ls_seqnum
==
2108 htonl(OSPF_MAX_SEQUENCE_NUMBER
)
2109 && !IS_LSA_MAXAGE(lsa
))) {
2111 "Link State Update[%s]: has Max Seq but not MaxAge. Dropping it",
2114 DISCARD_LSA(lsa
, 4);
2117 /* Actual flooding procedure. */
2118 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2119 < 0) /* Trap NSSA later. */
2120 DISCARD_LSA(lsa
, 5);
2124 /* (6) Else, If there is an instance of the LSA on the sending
2125 neighbor's Link state request list, an error has occurred in
2126 the Database Exchange process. In this case, restart the
2127 Database Exchange process by generating the neighbor event
2128 BadLSReq for the sending neighbor and stop processing the
2129 Link State Update packet. */
2131 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2132 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2135 "LSA[%s] instance exists on Link state request list",
2138 /* Clean list of LSAs. */
2139 ospf_upd_list_clean(lsas
);
2140 /* this lsa is not on lsas list already. */
2141 ospf_lsa_discard(lsa
);
2145 /* If the received LSA is the same instance as the database copy
2146 (i.e., neither one is more recent) the following two steps
2147 should be performed: */
2150 /* If the LSA is listed in the Link state retransmission
2152 for the receiving adjacency, the router itself is
2154 an acknowledgment for this LSA. The router should
2156 received LSA as an acknowledgment by removing the LSA
2158 the Link state retransmission list. This is termed
2160 "implied acknowledgment". */
2162 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2164 if (ls_ret
!= NULL
) {
2165 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2167 /* Delayed acknowledgment sent if advertisement
2169 from Designated Router, otherwise do nothing.
2171 if (oi
->state
== ISM_Backup
)
2175 ospf_lsa_lock(lsa
));
2177 DISCARD_LSA(lsa
, 6);
2179 /* Acknowledge the receipt of the LSA by sending a
2180 Link State Acknowledgment packet back out the
2184 ospf_ls_ack_send(nbr
, lsa
);
2185 DISCARD_LSA(lsa
, 7);
2189 /* The database copy is more recent. If the database copy
2190 has LS age equal to MaxAge and LS sequence number equal to
2191 MaxSequenceNumber, simply discard the received LSA without
2192 acknowledging it. (In this case, the LSA's LS sequence number
2194 wrapping, and the MaxSequenceNumber LSA must be completely
2195 flushed before any new LSA instance can be introduced). */
2197 else if (ret
> 0) /* Database copy is more recent */
2199 if (IS_LSA_MAXAGE(current
)
2200 && current
->data
->ls_seqnum
2201 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2202 DISCARD_LSA(lsa
, 8);
2204 /* Otherwise, as long as the database copy has not been
2206 Link State Update within the last MinLSArrival
2208 database copy back to the sending neighbor,
2210 a Link State Update Packet. The Link State Update
2212 be sent directly to the neighbor. In so doing, do not
2214 database copy of the LSA on the neighbor's link state
2215 retransmission list, and do not acknowledge the
2217 recent) LSA instance. */
2219 if (monotime_since(¤t
->tv_orig
, NULL
)
2220 >= ospf
->min_ls_arrival
* 1000LL)
2221 /* Trap NSSA type later.*/
2222 ospf_ls_upd_send_lsa(
2224 OSPF_SEND_PACKET_DIRECT
);
2225 DISCARD_LSA(lsa
, 9);
2231 assert(listcount(lsas
) == 0);
2235 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2236 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2237 struct stream
*s
, struct ospf_interface
*oi
,
2240 struct ospf_neighbor
*nbr
;
2242 /* increment statistics. */
2245 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2247 flog_warn(EC_OSPF_PACKET
,
2248 "Link State Acknowledgment: Unknown Neighbor %s.",
2249 inet_ntoa(ospfh
->router_id
));
2253 /* Add event to thread. */
2254 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
2256 if (nbr
->state
< NSM_Exchange
) {
2257 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2259 "Link State Acknowledgment: "
2260 "Neighbor[%s] state %s is less than Exchange",
2261 inet_ntoa(ospfh
->router_id
),
2262 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2267 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2268 struct ospf_lsa
*lsa
, *lsr
;
2270 lsa
= ospf_lsa_new();
2271 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2272 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2274 /* lsah = (struct lsa_header *) stream_pnt (s); */
2275 size
-= OSPF_LSA_HEADER_SIZE
;
2276 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2278 if (lsa
->data
->type
< OSPF_MIN_LSA
2279 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2281 ospf_lsa_discard(lsa
);
2285 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2287 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0)
2288 ospf_ls_retransmit_delete(nbr
, lsr
);
2291 ospf_lsa_discard(lsa
);
2297 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2298 struct interface
**ifp
,
2299 struct stream
*ibuf
)
2304 ifindex_t ifindex
= 0;
2306 /* Header and data both require alignment. */
2307 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2310 memset(&msgh
, 0, sizeof(struct msghdr
));
2311 msgh
.msg_iov
= &iov
;
2312 msgh
.msg_iovlen
= 1;
2313 msgh
.msg_control
= (caddr_t
)buff
;
2314 msgh
.msg_controllen
= sizeof(buff
);
2316 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, 0, OSPF_MAX_PACKET_SIZE
+ 1);
2318 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2319 safe_strerror(errno
));
2322 if ((unsigned int)ret
< sizeof(iph
)) /* ret must be > 0 now */
2326 "ospf_recv_packet: discarding runt packet of length %d "
2327 "(ip header size is %u)",
2328 ret
, (unsigned int)sizeof(iph
));
2332 /* Note that there should not be alignment problems with this assignment
2333 because this is at the beginning of the stream data buffer. */
2334 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2335 sockopt_iphdrincl_swab_systoh(iph
);
2337 ip_len
= iph
->ip_len
;
2339 #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000)
2341 * Kernel network code touches incoming IP header parameters,
2342 * before protocol specific processing.
2344 * 1) Convert byteorder to host representation.
2345 * --> ip_len, ip_id, ip_off
2347 * 2) Adjust ip_len to strip IP header size!
2348 * --> If user process receives entire IP packet via RAW
2349 * socket, it must consider adding IP header size to
2350 * the "ip_len" field of "ip" structure.
2352 * For more details, see <netinet/ip_input.c>.
2354 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2357 #if defined(__DragonFly__)
2359 * in DragonFly's raw socket, ip_len/ip_off are read
2360 * in network byte order.
2361 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2363 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2366 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2368 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2370 if (ret
!= ip_len
) {
2373 "ospf_recv_packet read length mismatch: ip_len is %d, "
2374 "but recvmsg returned %d",
2382 static struct ospf_interface
*
2383 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2384 struct ip
*iph
, struct ospf_header
*ospfh
)
2386 struct ospf_interface
*rcv_oi
;
2387 struct ospf_vl_data
*vl_data
;
2388 struct ospf_area
*vl_area
;
2389 struct listnode
*node
;
2391 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2392 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2395 /* look for local OSPF interface matching the destination
2396 * to determine Area ID. We presume therefore the destination address
2397 * is unique, or at least (for "unnumbered" links), not used in other
2400 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2404 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2406 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2410 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2411 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2412 if (IS_DEBUG_OSPF_EVENT
)
2413 zlog_debug("associating packet with %s",
2414 IF_NAME(vl_data
->vl_oi
));
2415 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2416 if (IS_DEBUG_OSPF_EVENT
)
2418 "This VL is not up yet, sorry");
2422 return vl_data
->vl_oi
;
2426 if (IS_DEBUG_OSPF_EVENT
)
2427 zlog_debug("couldn't find any VL to associate the packet with");
2432 static int ospf_check_area_id(struct ospf_interface
*oi
,
2433 struct ospf_header
*ospfh
)
2435 /* Check match the Area ID of the receiving interface. */
2436 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2442 /* Unbound socket will accept any Raw IP packets if proto is matched.
2443 To prevent it, compare src IP address and i/f address with masking
2444 i/f network mask. */
2445 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2446 struct in_addr ip_src
)
2448 struct in_addr mask
, me
, him
;
2450 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2451 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2454 masklen2ip(oi
->address
->prefixlen
, &mask
);
2456 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2457 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2459 if (IPV4_ADDR_SAME(&me
, &him
))
2465 /* Return 1, if the packet is properly authenticated and checksummed,
2466 0 otherwise. In particular, check that AuType header field is valid and
2467 matches the locally configured AuType, and that D.5 requirements are met. */
2468 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2470 struct crypt_key
*ck
;
2471 uint16_t iface_auth_type
;
2472 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2474 switch (pkt_auth_type
) {
2475 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2476 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2477 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2480 "interface %s: auth-type mismatch, local %s, rcvd Null",
2482 lookup_msg(ospf_auth_type_str
,
2483 iface_auth_type
, NULL
));
2486 if (!ospf_check_sum(ospfh
)) {
2487 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2490 "interface %s: Null auth OK, but checksum error, Router-ID %s",
2492 inet_ntoa(ospfh
->router_id
));
2496 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2497 if (OSPF_AUTH_SIMPLE
2498 != (iface_auth_type
= ospf_auth_type(oi
))) {
2499 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2502 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2504 lookup_msg(ospf_auth_type_str
,
2505 iface_auth_type
, NULL
));
2508 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2509 OSPF_AUTH_SIMPLE_SIZE
)) {
2510 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2511 flog_warn(EC_OSPF_PACKET
,
2512 "interface %s: Simple auth failed",
2516 if (!ospf_check_sum(ospfh
)) {
2517 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2520 "interface %s: Simple auth OK, checksum error, Router-ID %s",
2522 inet_ntoa(ospfh
->router_id
));
2526 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2527 if (OSPF_AUTH_CRYPTOGRAPHIC
2528 != (iface_auth_type
= ospf_auth_type(oi
))) {
2529 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2532 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2534 lookup_msg(ospf_auth_type_str
,
2535 iface_auth_type
, NULL
));
2538 if (ospfh
->checksum
) {
2539 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2542 "interface %s: OSPF header checksum is not 0",
2546 /* only MD5 crypto method can pass ospf_packet_examin() */
2547 if (NULL
== (ck
= listgetdata(
2548 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2549 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2550 /* Condition above uses the last key ID on the list,
2552 different from what ospf_crypt_key_lookup() does. A
2554 !ospf_check_md5_digest(oi
, ospfh
)) {
2555 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2556 flog_warn(EC_OSPF_MD5
,
2557 "interface %s: MD5 auth failed",
2563 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2566 "interface %s: invalid packet auth-type (%02x)",
2567 IF_NAME(oi
), pkt_auth_type
);
2572 static int ospf_check_sum(struct ospf_header
*ospfh
)
2577 /* clear auth_data for checksum. */
2578 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2580 /* keep checksum and clear. */
2581 sum
= ospfh
->checksum
;
2582 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2584 /* calculate checksum. */
2585 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2588 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2596 /* Verify, that given link/TOS records are properly sized/aligned and match
2597 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2598 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2600 const uint16_t num_links
)
2602 unsigned counted_links
= 0, thislinklen
;
2606 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2607 if (thislinklen
> linkbytes
) {
2608 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2609 zlog_debug("%s: length error in link block #%u",
2610 __func__
, counted_links
);
2613 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2614 linkbytes
-= thislinklen
;
2617 if (counted_links
!= num_links
) {
2618 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2619 zlog_debug("%s: %u link blocks declared, %u present",
2620 __func__
, num_links
, counted_links
);
2626 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2627 minimum length constraint). */
2628 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2629 const uint8_t headeronly
)
2632 struct router_lsa
*rlsa
;
2633 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2634 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2635 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2636 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2637 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2641 switch (lsah
->type
) {
2642 case OSPF_ROUTER_LSA
:
2643 /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1
2644 * (12+)-byte link blocks */
2646 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2647 - OSPF_ROUTER_LSA_MIN_SIZE
)
2653 rlsa
= (struct router_lsa
*)lsah
;
2654 ret
= ospf_router_lsa_links_examin(
2655 (struct router_lsa_link
*)rlsa
->link
,
2656 lsalen
- OSPF_LSA_HEADER_SIZE
- 4, /* skip: basic
2659 ntohs(rlsa
->links
) /* 16 bits */
2662 case OSPF_AS_EXTERNAL_LSA
:
2663 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2665 case OSPF_AS_NSSA_LSA
:
2666 /* RFC3101 C, idem */
2667 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2668 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2673 /* Following LSA types are considered OK length-wise as soon as their
2675 * length constraint is met and length of the whole LSA is a multiple of
2677 * (basic LSA header size is already a multiple of 4). */
2678 case OSPF_NETWORK_LSA
:
2679 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2680 case OSPF_SUMMARY_LSA
:
2681 case OSPF_ASBR_SUMMARY_LSA
:
2682 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2684 case OSPF_OPAQUE_LINK_LSA
:
2685 case OSPF_OPAQUE_AREA_LSA
:
2686 case OSPF_OPAQUE_AS_LSA
:
2687 /* RFC5250 A.2, "some number of octets (of application-specific
2688 * data) padded to 32-bit alignment." This is considered
2690 * to 4-byte alignment of all other LSA types, see
2691 * OSPF-ALIGNMENT.txt
2692 * file for the detailed analysis of this passage. */
2693 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2696 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2697 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2701 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2702 zlog_debug("%s: alignment error in %s", __func__
,
2703 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2707 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2708 includes verification of LSA blocks length/alignment and dispatching
2709 of deeper-level checks. */
2711 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2712 size_t length
, const uint8_t headeronly
,
2713 /* When declared_num_lsas is not 0, compare it to the real
2715 and treat the difference as an error. */
2716 const uint32_t declared_num_lsas
)
2718 uint32_t counted_lsas
= 0;
2722 if (length
< OSPF_LSA_HEADER_SIZE
) {
2723 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2725 "%s: undersized (%zu B) trailing (#%u) LSA header",
2726 __func__
, length
, counted_lsas
);
2729 /* save on ntohs() calls here and in the LSA validator */
2730 lsalen
= ntohs(lsah
->length
);
2731 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2732 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2734 "%s: malformed LSA header #%u, declared length is %u B",
2735 __func__
, counted_lsas
, lsalen
);
2739 /* less checks here and in ospf_lsa_examin() */
2740 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2741 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2743 "%s: malformed header-only LSA #%u",
2744 __func__
, counted_lsas
);
2747 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2748 + OSPF_LSA_HEADER_SIZE
);
2749 length
-= OSPF_LSA_HEADER_SIZE
;
2751 /* make sure the input buffer is deep enough before
2753 if (lsalen
> length
) {
2754 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2756 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2757 __func__
, counted_lsas
, lsalen
,
2761 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2762 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2763 zlog_debug("%s: malformed LSA #%u",
2764 __func__
, counted_lsas
);
2767 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2773 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2774 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2776 "%s: #LSAs declared (%u) does not match actual (%u)",
2777 __func__
, declared_num_lsas
, counted_lsas
);
2783 /* Verify a complete OSPF packet for proper sizing/alignment. */
2784 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2785 const unsigned bytesonwire
)
2787 uint16_t bytesdeclared
, bytesauth
;
2789 struct ospf_ls_update
*lsupd
;
2791 /* Length, 1st approximation. */
2792 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2793 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2794 zlog_debug("%s: undersized (%u B) packet", __func__
,
2798 /* Now it is safe to access header fields. Performing length check,
2800 * for possible extra bytes of crypto auth/padding, which are not
2802 * in the OSPF header "length" field. */
2803 if (oh
->version
!= OSPF_VERSION
) {
2804 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2805 zlog_debug("%s: invalid (%u) protocol version",
2806 __func__
, oh
->version
);
2809 bytesdeclared
= ntohs(oh
->length
);
2810 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2813 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2814 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2816 "%s: unsupported crypto auth length (%u B)",
2817 __func__
, oh
->u
.crypt
.auth_data_len
);
2820 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2822 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2823 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2825 "%s: packet length error (%u real, %u+%u declared)",
2826 __func__
, bytesonwire
, bytesdeclared
,
2830 /* Length, 2nd approximation. The type-specific constraint is checked
2831 against declared length, not amount of bytes on wire. */
2832 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2834 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2835 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2836 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2838 lookup_msg(ospf_packet_type_str
, oh
->type
,
2843 case OSPF_MSG_HELLO
:
2844 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2846 by N>=0 router-IDs. */
2847 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2852 case OSPF_MSG_DB_DESC
:
2853 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2855 by N>=0 header-only LSAs. */
2856 ret
= ospf_lsaseq_examin(
2857 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2858 + OSPF_DB_DESC_MIN_SIZE
),
2859 bytesdeclared
- OSPF_HEADER_SIZE
2860 - OSPF_DB_DESC_MIN_SIZE
,
2861 1, /* header-only LSAs */
2864 case OSPF_MSG_LS_REQ
:
2865 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2866 * request blocks. */
2867 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2872 case OSPF_MSG_LS_UPD
:
2873 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2875 by N>=0 full LSAs (with N declared beforehand). */
2876 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2877 + OSPF_HEADER_SIZE
);
2878 ret
= ospf_lsaseq_examin(
2879 (struct lsa_header
*)((caddr_t
)lsupd
2880 + OSPF_LS_UPD_MIN_SIZE
),
2881 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2883 ntohl(lsupd
->num_lsas
) /* 32 bits */
2886 case OSPF_MSG_LS_ACK
:
2887 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2889 ret
= ospf_lsaseq_examin(
2890 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2891 + OSPF_LS_ACK_MIN_SIZE
),
2892 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2893 1, /* header-only LSAs */
2897 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2898 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2902 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2903 zlog_debug("%s: malformed %s packet", __func__
,
2904 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2908 /* OSPF Header verification. */
2909 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2910 struct ip
*iph
, struct ospf_header
*ospfh
)
2912 /* Check Area ID. */
2913 if (!ospf_check_area_id(oi
, ospfh
)) {
2914 flog_warn(EC_OSPF_PACKET
,
2915 "interface %s: ospf_read invalid Area ID %s.",
2916 IF_NAME(oi
), inet_ntoa(ospfh
->area_id
));
2920 /* Check network mask, Silently discarded. */
2921 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2924 "interface %s: ospf_read network address is not same [%s]",
2925 IF_NAME(oi
), inet_ntoa(iph
->ip_src
));
2929 /* Check authentication. The function handles logging actions, where
2931 if (!ospf_check_auth(oi
, ospfh
))
2937 /* Starting point of packet process function. */
2938 int ospf_read(struct thread
*thread
)
2941 struct stream
*ibuf
;
2943 struct ospf_interface
*oi
;
2945 struct ospf_header
*ospfh
;
2947 struct interface
*ifp
= NULL
;
2948 struct connected
*c
;
2950 /* first of all get interface pointer. */
2951 ospf
= THREAD_ARG(thread
);
2953 /* prepare for next packet. */
2954 ospf
->t_read
= NULL
;
2955 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
2957 stream_reset(ospf
->ibuf
);
2958 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2961 /* This raw packet is known to be at least as big as its IP header. */
2963 /* Note that there should not be alignment problems with this assignment
2964 because this is at the beginning of the stream data buffer. */
2965 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2966 /* Note that sockopt_iphdrincl_swab_systoh was called in
2967 * ospf_recv_packet. */
2970 /* Handle cases where the platform does not support retrieving
2972 and also platforms (such as Solaris 8) that claim to support
2974 retrieval but do not. */
2975 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2983 /* IP Header dump. */
2984 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2985 ospf_ip_header_dump(iph
);
2987 /* Self-originated packet should be discarded silently. */
2988 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
2989 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
2991 "ospf_read[%s]: Dropping self-originated packet",
2992 inet_ntoa(iph
->ip_src
));
2997 /* Advance from IP header to OSPF header (iph->ip_hl has been verified
2998 by ospf_recv_packet() to be correct). */
2999 stream_forward_getp(ibuf
, iph
->ip_hl
* 4);
3001 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3003 != ospf_packet_examin(
3004 ospfh
, stream_get_endp(ibuf
) - stream_get_getp(ibuf
)))
3006 /* Now it is safe to access all fields of OSPF packet header. */
3008 /* associate packet with ospf interface */
3009 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3011 /* ospf_verify_header() relies on a valid "oi" and thus can be called
3013 after the passive/backbone/other checks below are passed. These
3015 in turn access the fields of unverified "ospfh" structure for their
3017 purposes and must remain very accurate in doing this. */
3019 /* If incoming interface is passive one, ignore it. */
3020 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3021 char buf
[3][INET_ADDRSTRLEN
];
3023 if (IS_DEBUG_OSPF_EVENT
)
3025 "ignoring packet from router %s sent to %s, "
3026 "received on a passive interface, %s",
3027 inet_ntop(AF_INET
, &ospfh
->router_id
, buf
[0],
3029 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3031 inet_ntop(AF_INET
, &oi
->address
->u
.prefix4
,
3032 buf
[2], sizeof(buf
[2])));
3034 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3035 /* Try to fix multicast membership.
3036 * Some OS:es may have problems in this area,
3037 * make sure it is removed.
3039 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3040 ospf_if_set_multicast(oi
);
3046 /* if no local ospf_interface,
3047 * or header area is backbone but ospf_interface is not
3048 * check for VLINK interface
3050 if ((oi
== NULL
) || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3051 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3052 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3054 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3056 "Packet from [%s] received on link %s"
3057 " but no ospf_interface",
3058 inet_ntoa(iph
->ip_src
), ifp
->name
);
3063 /* else it must be a local ospf interface, check it was received on
3066 else if (oi
->ifp
!= ifp
) {
3067 if (IS_DEBUG_OSPF_EVENT
)
3068 flog_warn(EC_OSPF_PACKET
,
3069 "Packet from [%s] received on wrong link %s",
3070 inet_ntoa(iph
->ip_src
), ifp
->name
);
3072 } else if (oi
->state
== ISM_Down
) {
3073 char buf
[2][INET_ADDRSTRLEN
];
3076 "Ignoring packet from %s to %s received on interface that is "
3077 "down [%s]; interface flags are %s",
3078 inet_ntop(AF_INET
, &iph
->ip_src
, buf
[0],
3080 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3082 ifp
->name
, if_flag_dump(ifp
->flags
));
3083 /* Fix multicast memberships? */
3084 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3085 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3086 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3087 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3088 if (oi
->multicast_memberships
)
3089 ospf_if_set_multicast(oi
);
3094 * If the received packet is destined for AllDRouters, the packet
3095 * should be accepted only if the received ospf interface state is
3096 * either DR or Backup -- endo.
3098 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3099 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3102 "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)",
3103 inet_ntoa(iph
->ip_src
), IF_NAME(oi
),
3104 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3105 /* Try to fix multicast membership. */
3106 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3107 ospf_if_set_multicast(oi
);
3111 /* Verify more OSPF header fields. */
3112 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3114 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3116 "ospf_read[%s]: Header check failed, "
3118 inet_ntoa(iph
->ip_src
));
3122 /* Show debug receiving packet. */
3123 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3124 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3126 "-----------------------------------------------------");
3127 ospf_packet_dump(ibuf
);
3130 zlog_debug("%s received from [%s] via [%s]",
3131 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3132 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
3133 zlog_debug(" src [%s],", inet_ntoa(iph
->ip_src
));
3134 zlog_debug(" dst [%s]", inet_ntoa(iph
->ip_dst
));
3136 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3138 "-----------------------------------------------------");
3141 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3143 /* Adjust size to message length. */
3144 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3146 /* Read rest of the packet and call each sort of packet routine. */
3147 switch (ospfh
->type
) {
3148 case OSPF_MSG_HELLO
:
3149 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3151 case OSPF_MSG_DB_DESC
:
3152 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3154 case OSPF_MSG_LS_REQ
:
3155 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3157 case OSPF_MSG_LS_UPD
:
3158 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3160 case OSPF_MSG_LS_ACK
:
3161 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3164 flog_warn(EC_OSPF_PACKET
,
3165 "interface %s: OSPF packet header type %d is illegal",
3166 IF_NAME(oi
), ospfh
->type
);
3173 /* Make OSPF header. */
3174 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3177 struct ospf_header
*ospfh
;
3179 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3181 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3182 ospfh
->type
= (uint8_t)type
;
3184 ospfh
->router_id
= oi
->ospf
->router_id
;
3186 ospfh
->checksum
= 0;
3187 ospfh
->area_id
= oi
->area
->area_id
;
3188 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3190 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3192 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3195 /* Make Authentication Data. */
3196 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3198 struct crypt_key
*ck
;
3200 switch (ospf_auth_type(oi
)) {
3201 case OSPF_AUTH_NULL
:
3202 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3205 case OSPF_AUTH_SIMPLE
:
3206 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3207 OSPF_AUTH_SIMPLE_SIZE
);
3209 case OSPF_AUTH_CRYPTOGRAPHIC
:
3210 /* If key is not set, then set 0. */
3211 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3212 ospfh
->u
.crypt
.zero
= 0;
3213 ospfh
->u
.crypt
.key_id
= 0;
3214 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3217 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3218 ospfh
->u
.crypt
.zero
= 0;
3219 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3220 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3222 /* note: the seq is done in ospf_make_md5_digest() */
3225 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3233 /* Fill rest of OSPF header. */
3234 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3237 struct ospf_header
*ospfh
;
3239 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3242 ospfh
->length
= htons(length
);
3244 /* Calculate checksum. */
3245 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3246 ospfh
->checksum
= in_cksum(ospfh
, length
);
3248 ospfh
->checksum
= 0;
3250 /* Add Authentication Data. */
3251 ospf_make_auth(oi
, ospfh
);
3254 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3256 struct ospf_neighbor
*nbr
;
3257 struct route_node
*rn
;
3258 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3259 struct in_addr mask
;
3263 /* Set netmask of interface. */
3264 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3265 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3266 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3267 masklen2ip(oi
->address
->prefixlen
, &mask
);
3269 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3270 stream_put_ipv4(s
, mask
.s_addr
);
3272 /* Set Hello Interval. */
3273 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3274 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3276 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3278 if (IS_DEBUG_OSPF_EVENT
)
3279 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3283 stream_putc(s
, OPTIONS(oi
));
3285 /* Set Router Priority. */
3286 stream_putc(s
, PRIORITY(oi
));
3288 /* Set Router Dead Interval. */
3289 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3291 /* Set Designated Router. */
3292 stream_put_ipv4(s
, DR(oi
).s_addr
);
3294 p
= stream_get_endp(s
);
3296 /* Set Backup Designated Router. */
3297 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3299 /* Add neighbor seen. */
3300 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3301 if ((nbr
= rn
->info
))
3302 if (nbr
->router_id
.s_addr
3303 != 0) /* Ignore 0.0.0.0 node. */
3305 != NSM_Attempt
) /* Ignore Down neighbor. */
3307 != NSM_Down
) /* This is myself for
3309 if (!IPV4_ADDR_SAME(
3311 &oi
->ospf
->router_id
)) {
3312 /* Check neighbor is
3314 if (nbr
->d_router
.s_addr
3328 /* Hello packet overflows interface MTU. */
3329 if (length
+ sizeof(uint32_t)
3330 > ospf_packet_max(oi
)) {
3332 EC_OSPF_LARGE_HELLO
,
3333 "Oversized Hello packet! Larger than MTU. Not sending it out");
3344 /* Let neighbor generate BackupSeen. */
3346 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3351 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3352 struct ospf_neighbor
*nbr
, struct stream
*s
)
3354 struct ospf_lsa
*lsa
;
3355 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3359 struct ospf_lsdb
*lsdb
;
3361 /* Set Interface MTU. */
3362 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3365 stream_putw(s
, oi
->ifp
->mtu
);
3368 options
= OPTIONS(oi
);
3369 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3370 SET_FLAG(options
, OSPF_OPTION_O
);
3371 stream_putc(s
, options
);
3374 pp
= stream_get_endp(s
);
3375 stream_putc(s
, nbr
->dd_flags
);
3377 /* Set DD Sequence Number. */
3378 stream_putl(s
, nbr
->dd_seqnum
);
3380 /* shortcut unneeded walk of (empty) summary LSDBs */
3381 if (ospf_db_summary_isempty(nbr
))
3384 /* Describe LSA Header from Database Summary List. */
3385 lsdb
= &nbr
->db_sum
;
3387 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3388 struct route_table
*table
= lsdb
->type
[i
].db
;
3389 struct route_node
*rn
;
3391 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3392 if ((lsa
= rn
->info
) != NULL
) {
3393 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3394 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3395 /* Suppress advertising
3396 * opaque-information. */
3397 /* Remove LSA from DB summary list. */
3398 ospf_lsdb_delete(lsdb
, lsa
);
3402 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3403 struct lsa_header
*lsah
;
3406 /* DD packet overflows interface MTU. */
3407 if (length
+ OSPF_LSA_HEADER_SIZE
3408 > ospf_packet_max(oi
))
3411 /* Keep pointer to LS age. */
3412 lsah
= (struct lsa_header
3417 /* Proceed stream pointer. */
3418 stream_put(s
, lsa
->data
,
3419 OSPF_LSA_HEADER_SIZE
);
3420 length
+= OSPF_LSA_HEADER_SIZE
;
3423 ls_age
= LS_AGE(lsa
);
3424 lsah
->ls_age
= htons(ls_age
);
3427 /* Remove LSA from DB summary list. */
3428 ospf_lsdb_delete(lsdb
, lsa
);
3432 /* Update 'More' bit */
3433 if (ospf_db_summary_isempty(nbr
)) {
3435 if (nbr
->state
>= NSM_Exchange
) {
3436 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3437 /* Rewrite DD flags */
3438 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3440 assert(IS_SET_DD_M(nbr
->dd_flags
));
3446 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3447 unsigned long delta
, struct ospf_neighbor
*nbr
,
3448 struct ospf_lsa
*lsa
)
3450 struct ospf_interface
*oi
;
3454 /* LS Request packet overflows interface MTU
3455 * delta is just number of bytes required for 1 LS Req
3456 * ospf_packet_max will return the number of bytes can
3457 * be accomodated without ospf header. So length+delta
3458 * can be compared to ospf_packet_max
3459 * to check if it can fit another lsreq in the same packet.
3462 if (*length
+ delta
> ospf_packet_max(oi
))
3465 stream_putl(s
, lsa
->data
->type
);
3466 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3467 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3469 ospf_lsa_unlock(&nbr
->ls_req_last
);
3470 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3476 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3478 struct ospf_lsa
*lsa
;
3479 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3480 unsigned long delta
= 12;
3481 struct route_table
*table
;
3482 struct route_node
*rn
;
3484 struct ospf_lsdb
*lsdb
;
3486 lsdb
= &nbr
->ls_req
;
3488 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3489 table
= lsdb
->type
[i
].db
;
3490 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3491 if ((lsa
= (rn
->info
)) != NULL
)
3492 if (ospf_make_ls_req_func(s
, &length
, delta
,
3495 route_unlock_node(rn
);
3502 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3506 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3508 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3511 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3514 struct ospf_lsa
*lsa
;
3515 struct listnode
*node
;
3516 uint16_t length
= 0;
3517 unsigned int size_noauth
;
3518 unsigned long delta
= stream_get_endp(s
);
3522 if (IS_DEBUG_OSPF_EVENT
)
3523 zlog_debug("ospf_make_ls_upd: Start");
3525 pp
= stream_get_endp(s
);
3526 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3527 length
+= OSPF_LS_UPD_MIN_SIZE
;
3529 /* Calculate amount of packet usable for data. */
3530 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3532 while ((node
= listhead(update
)) != NULL
) {
3533 struct lsa_header
*lsah
;
3536 if (IS_DEBUG_OSPF_EVENT
)
3537 zlog_debug("ospf_make_ls_upd: List Iteration %d",
3540 lsa
= listgetdata(node
);
3544 /* Will it fit? Minimum it has to fit atleast one */
3545 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3549 /* Keep pointer to LS age. */
3550 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3551 + stream_get_endp(s
));
3553 /* Put LSA to Link State Request. */
3554 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3557 /* each hop must increment an lsa_age by transmit_delay
3558 of OSPF interface */
3559 ls_age
= ls_age_increment(lsa
,
3560 OSPF_IF_PARAM(oi
, transmit_delay
));
3561 lsah
->ls_age
= htons(ls_age
);
3563 length
+= ntohs(lsa
->data
->length
);
3566 list_delete_node(update
, node
);
3567 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3570 /* Now set #LSAs. */
3571 stream_putl_at(s
, pp
, count
);
3573 if (IS_DEBUG_OSPF_EVENT
)
3574 zlog_debug("ospf_make_ls_upd: Stop");
3578 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3581 struct listnode
*node
, *nnode
;
3582 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3583 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3584 struct ospf_lsa
*lsa
;
3586 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3589 /* LS Ack packet overflows interface MTU
3590 * delta is just number of bytes required for
3591 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3592 * the number of bytes can be accomodated without
3593 * ospf header. So length+delta can be compared
3594 * against ospf_packet_max to check if it can fit
3595 * another ls header in the same packet.
3597 if ((length
+ delta
) > ospf_packet_max(oi
))
3600 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3601 length
+= OSPF_LSA_HEADER_SIZE
;
3603 listnode_delete(ack
, lsa
);
3604 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3610 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3612 struct ospf_packet
*op
;
3613 uint16_t length
= OSPF_HEADER_SIZE
;
3615 op
= ospf_packet_new(oi
->ifp
->mtu
);
3617 /* Prepare OSPF common header. */
3618 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3620 /* Prepare OSPF Hello body. */
3621 length
+= ospf_make_hello(oi
, op
->s
);
3622 if (length
== OSPF_HEADER_SIZE
) {
3623 /* Hello overshooting MTU */
3624 ospf_packet_free(op
);
3628 /* Fill OSPF header. */
3629 ospf_fill_header(oi
, op
->s
, length
);
3631 /* Set packet length. */
3632 op
->length
= length
;
3634 op
->dst
.s_addr
= addr
;
3636 if (IS_DEBUG_OSPF_EVENT
) {
3637 if (oi
->ospf
->vrf_id
)
3639 "%s: Hello Tx interface %s ospf vrf %s id %u",
3640 __PRETTY_FUNCTION__
, oi
->ifp
->name
,
3641 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3644 /* Add packet to the top of the interface output queue, so that they
3645 * can't get delayed by things like long queues of LS Update packets
3647 ospf_packet_add_top(oi
, op
);
3649 /* Hook thread to write packet. */
3650 OSPF_ISM_WRITE_ON(oi
->ospf
);
3653 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3655 struct ospf_interface
*oi
;
3660 /* If this is passive interface, do not send OSPF Hello. */
3661 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3664 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3667 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3670 if (PRIORITY(oi
) == 0)
3673 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3674 && oi
->state
!= ISM_Backup
)
3677 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3680 int ospf_poll_timer(struct thread
*thread
)
3682 struct ospf_nbr_nbma
*nbr_nbma
;
3684 nbr_nbma
= THREAD_ARG(thread
);
3685 nbr_nbma
->t_poll
= NULL
;
3687 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3688 zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)",
3689 IF_NAME(nbr_nbma
->oi
), inet_ntoa(nbr_nbma
->addr
));
3691 ospf_poll_send(nbr_nbma
);
3693 if (nbr_nbma
->v_poll
> 0)
3694 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3701 int ospf_hello_reply_timer(struct thread
*thread
)
3703 struct ospf_neighbor
*nbr
;
3705 nbr
= THREAD_ARG(thread
);
3706 nbr
->t_hello_reply
= NULL
;
3710 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3711 zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)",
3712 IF_NAME(nbr
->oi
), inet_ntoa(nbr
->router_id
));
3714 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3719 /* Send OSPF Hello. */
3720 void ospf_hello_send(struct ospf_interface
*oi
)
3722 /* If this is passive interface, do not send OSPF Hello. */
3723 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3726 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3727 struct ospf_neighbor
*nbr
;
3728 struct route_node
*rn
;
3730 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3731 if ((nbr
= rn
->info
))
3732 if (nbr
!= oi
->nbr_self
)
3733 if (nbr
->state
!= NSM_Down
) {
3734 /* RFC 2328 Section 9.5.1
3735 If the router is not
3736 eligible to become Designated
3738 it must periodically send
3739 Hello Packets to both the
3740 Designated Router and the
3741 Backup Designated Router (if
3744 if (PRIORITY(oi
) == 0
3755 /* If the router is eligible to
3756 become Designated Router, it
3757 must periodically send Hello
3758 Packets to all neighbors that
3759 are also eligible. In
3760 addition, if the router is
3762 Designated Router or Backup
3763 Designated Router, it must
3765 send periodic Hello Packets
3766 to all other neighbors. */
3768 if (nbr
->priority
== 0
3769 && oi
->state
== ISM_DROther
)
3771 /* if oi->state == Waiting, send
3772 * hello to all neighbors */
3773 ospf_hello_send_sub(
3775 nbr
->address
.u
.prefix4
3779 /* Decide destination address. */
3780 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3781 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3783 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3787 /* Send OSPF Database Description. */
3788 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3790 struct ospf_interface
*oi
;
3791 struct ospf_packet
*op
;
3792 uint16_t length
= OSPF_HEADER_SIZE
;
3795 op
= ospf_packet_new(oi
->ifp
->mtu
);
3797 /* Prepare OSPF common header. */
3798 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3800 /* Prepare OSPF Database Description body. */
3801 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3803 /* Fill OSPF header. */
3804 ospf_fill_header(oi
, op
->s
, length
);
3806 /* Set packet length. */
3807 op
->length
= length
;
3809 /* Decide destination address. */
3810 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3811 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3813 op
->dst
= nbr
->address
.u
.prefix4
;
3815 /* Add packet to the interface output queue. */
3816 ospf_packet_add(oi
, op
);
3818 /* Hook thread to write packet. */
3819 OSPF_ISM_WRITE_ON(oi
->ospf
);
3821 /* Remove old DD packet, then copy new one and keep in neighbor
3824 ospf_packet_free(nbr
->last_send
);
3825 nbr
->last_send
= ospf_packet_dup(op
);
3826 monotime(&nbr
->last_send_ts
);
3829 /* Re-send Database Description. */
3830 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3832 struct ospf_interface
*oi
;
3836 /* Add packet to the interface output queue. */
3837 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3839 /* Hook thread to write packet. */
3840 OSPF_ISM_WRITE_ON(oi
->ospf
);
3843 /* Send Link State Request. */
3844 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3846 struct ospf_interface
*oi
;
3847 struct ospf_packet
*op
;
3848 uint16_t length
= OSPF_HEADER_SIZE
;
3851 op
= ospf_packet_new(oi
->ifp
->mtu
);
3853 /* Prepare OSPF common header. */
3854 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3856 /* Prepare OSPF Link State Request body. */
3857 length
+= ospf_make_ls_req(nbr
, op
->s
);
3858 if (length
== OSPF_HEADER_SIZE
) {
3859 ospf_packet_free(op
);
3863 /* Fill OSPF header. */
3864 ospf_fill_header(oi
, op
->s
, length
);
3866 /* Set packet length. */
3867 op
->length
= length
;
3869 /* Decide destination address. */
3870 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3871 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3873 op
->dst
= nbr
->address
.u
.prefix4
;
3875 /* Add packet to the interface output queue. */
3876 ospf_packet_add(oi
, op
);
3878 /* Hook thread to write packet. */
3879 OSPF_ISM_WRITE_ON(oi
->ospf
);
3881 /* Add Link State Request Retransmission Timer. */
3882 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3885 /* Send Link State Update with an LSA. */
3886 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3889 struct list
*update
;
3891 update
= list_new();
3893 listnode_add(update
, lsa
);
3895 /*ospf instance is going down, send self originated
3896 * MAXAGE LSA update to neighbors to remove from LSDB */
3897 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3898 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3900 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3902 list_delete(&update
);
3905 /* Determine size for packet. Must be at least big enough to accomodate next
3906 * LSA on list, which may be bigger than MTU size.
3908 * Return pointer to new ospf_packet
3909 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3910 * on packet sizes (in which case offending LSA is deleted from update list)
3912 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3913 struct ospf_interface
*oi
)
3915 struct ospf_lsa
*lsa
;
3916 struct listnode
*ln
;
3918 static char warned
= 0;
3920 lsa
= listgetdata((ln
= listhead(update
)));
3923 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3924 > ospf_packet_max(oi
)) {
3928 "ospf_ls_upd_packet_new: oversized LSA encountered!"
3929 "will need to fragment. Not optimal. Try divide up"
3930 " your network with areas. Use 'debug ospf packet send'"
3931 " to see details, or look at 'show ip ospf database ..'");
3935 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3937 "ospf_ls_upd_packet_new: oversized LSA id:%s,"
3938 " %d bytes originated by %s, will be fragmented!",
3939 inet_ntoa(lsa
->data
->id
),
3940 ntohs(lsa
->data
->length
),
3941 inet_ntoa(lsa
->data
->adv_router
));
3944 * Allocate just enough to fit this LSA only, to avoid including
3946 * LSAs in fragmented LSA Updates.
3948 size
= ntohs(lsa
->data
->length
)
3949 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
3950 + OSPF_LS_UPD_MIN_SIZE
;
3952 size
= oi
->ifp
->mtu
;
3954 if (size
> OSPF_MAX_PACKET_SIZE
) {
3955 flog_warn(EC_OSPF_LARGE_LSA
,
3956 "ospf_ls_upd_packet_new: oversized LSA id:%s too big,"
3957 " %d bytes, packet size %ld, dropping it completely."
3958 " OSPF routing is broken!",
3959 inet_ntoa(lsa
->data
->id
), ntohs(lsa
->data
->length
),
3961 list_delete_node(update
, ln
);
3965 /* IP header is built up separately by ospf_write(). This means, that we
3967 * reduce the "affordable" size just calculated by length of an IP
3969 * This makes sure, that even if we manage to fill the payload with LSA
3971 * completely, the final packet (our data plus IP header) still fits
3973 * outgoing interface MTU. This correction isn't really meaningful for
3975 * oversized LSA, but for consistency the correction is done for both
3978 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
3980 return ospf_packet_new(size
- sizeof(struct ip
));
3983 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
3984 struct list
*update
, struct in_addr addr
,
3987 struct ospf_packet
*op
;
3988 uint16_t length
= OSPF_HEADER_SIZE
;
3990 if (IS_DEBUG_OSPF_EVENT
)
3991 zlog_debug("listcount = %d, [%s]dst %s", listcount(update
),
3992 IF_NAME(oi
), inet_ntoa(addr
));
3994 /* Check that we have really something to process */
3995 if (listcount(update
) == 0)
3998 op
= ospf_ls_upd_packet_new(update
, oi
);
4000 /* Prepare OSPF common header. */
4001 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4003 /* Prepare OSPF Link State Update body.
4004 * Includes Type-7 translation.
4006 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4008 /* Fill OSPF header. */
4009 ospf_fill_header(oi
, op
->s
, length
);
4011 /* Set packet length. */
4012 op
->length
= length
;
4014 /* Decide destination address. */
4015 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4016 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4018 op
->dst
.s_addr
= addr
.s_addr
;
4020 /* Add packet to the interface output queue. */
4021 ospf_packet_add(oi
, op
);
4022 /* Call ospf_write() right away to send ospf packets to neighbors */
4023 if (send_lsupd_now
) {
4024 struct thread os_packet_thd
;
4026 os_packet_thd
.arg
= (void *)oi
->ospf
;
4027 if (oi
->on_write_q
== 0) {
4028 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4031 ospf_write(&os_packet_thd
);
4033 * We are fake calling ospf_write with a fake
4034 * thread. Imagine that we have oi_a already
4035 * enqueued and we have turned on the write
4037 * Now this function calls this for oi_b
4038 * so the on_write_q has oi_a and oi_b on
4039 * it, ospf_write runs and clears the packets
4040 * for both oi_a and oi_b. Removing them from
4041 * the on_write_q. After this thread of execution
4042 * finishes we will execute the t_write thread
4043 * with nothing in the on_write_q causing an
4044 * assert. So just make sure that the t_write
4045 * is actually turned off.
4047 if (list_isempty(oi
->ospf
->oi_write_q
))
4048 OSPF_TIMER_OFF(oi
->ospf
->t_write
);
4050 /* Hook thread to write packet. */
4051 OSPF_ISM_WRITE_ON(oi
->ospf
);
4055 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
4057 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4058 struct route_node
*rn
;
4059 struct route_node
*rnext
;
4060 struct list
*update
;
4063 oi
->t_ls_upd_event
= NULL
;
4065 if (IS_DEBUG_OSPF_EVENT
)
4066 zlog_debug("ospf_ls_upd_send_queue start");
4068 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4069 rnext
= route_next(rn
);
4071 if (rn
->info
== NULL
)
4074 update
= (struct list
*)rn
->info
;
4076 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4078 /* list might not be empty. */
4079 if (listcount(update
) == 0) {
4080 list_delete((struct list
**)&rn
->info
);
4081 route_unlock_node(rn
);
4087 if (IS_DEBUG_OSPF_EVENT
)
4089 "ospf_ls_upd_send_queue: update lists not cleared,"
4090 " %d nodes to try again, raising new event",
4092 oi
->t_ls_upd_event
= NULL
;
4093 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4094 &oi
->t_ls_upd_event
);
4097 if (IS_DEBUG_OSPF_EVENT
)
4098 zlog_debug("ospf_ls_upd_send_queue stop");
4103 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4106 struct ospf_interface
*oi
;
4107 struct ospf_lsa
*lsa
;
4108 struct prefix_ipv4 p
;
4109 struct route_node
*rn
;
4110 struct listnode
*node
;
4115 p
.prefixlen
= IPV4_MAX_BITLEN
;
4117 /* Decide destination address. */
4118 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4119 p
.prefix
= oi
->vl_data
->peer_addr
;
4120 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4121 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4122 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4123 p
.prefix
= nbr
->address
.u
.prefix4
;
4124 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4125 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4126 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4127 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4129 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4131 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4132 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4135 "* LS-Update is directly sent on NBMA network.");
4136 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4137 flog_warn(EC_OSPF_PACKET
,
4138 "* LS-Update is sent to myself.");
4141 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4143 if (rn
->info
== NULL
)
4144 rn
->info
= list_new();
4146 route_unlock_node(rn
);
4148 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4149 listnode_add(rn
->info
,
4150 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4151 if (send_lsupd_now
) {
4152 struct list
*send_update_list
;
4153 struct route_node
*rnext
;
4155 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4156 rnext
= route_next(rn
);
4158 if (rn
->info
== NULL
)
4161 send_update_list
= (struct list
*)rn
->info
;
4163 ospf_ls_upd_queue_send(oi
, send_update_list
,
4164 rn
->p
.u
.prefix4
, 1);
4167 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4168 &oi
->t_ls_upd_event
);
4171 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4174 struct ospf_packet
*op
;
4175 uint16_t length
= OSPF_HEADER_SIZE
;
4177 op
= ospf_packet_new(oi
->ifp
->mtu
);
4179 /* Prepare OSPF common header. */
4180 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4182 /* Prepare OSPF Link State Acknowledgment body. */
4183 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4185 /* Fill OSPF header. */
4186 ospf_fill_header(oi
, op
->s
, length
);
4188 /* Set packet length. */
4189 op
->length
= length
;
4191 /* Decide destination address. */
4192 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4193 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4195 op
->dst
.s_addr
= dst
.s_addr
;
4197 /* Add packet to the interface output queue. */
4198 ospf_packet_add(oi
, op
);
4200 /* Hook thread to write packet. */
4201 OSPF_ISM_WRITE_ON(oi
->ospf
);
4204 static int ospf_ls_ack_send_event(struct thread
*thread
)
4206 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4208 oi
->t_ls_ack_direct
= NULL
;
4210 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4211 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4212 oi
->ls_ack_direct
.dst
);
4217 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4219 struct ospf_interface
*oi
= nbr
->oi
;
4221 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4222 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4224 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4226 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4227 &oi
->t_ls_ack_direct
);
4230 /* Send Link State Acknowledgment delayed. */
4231 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4235 /* Decide destination address. */
4236 /* RFC2328 Section 13.5 On non-broadcast
4237 networks, delayed Link State Acknowledgment packets must be
4238 unicast separately over each adjacency (i.e., neighbor whose
4239 state is >= Exchange). */
4240 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4241 struct ospf_neighbor
*nbr
;
4242 struct route_node
*rn
;
4244 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4245 if ((nbr
= rn
->info
) != NULL
)
4246 if (nbr
!= oi
->nbr_self
4247 && nbr
->state
>= NSM_Exchange
)
4248 while (listcount(oi
->ls_ack
))
4249 ospf_ls_ack_send_list(
4251 nbr
->address
.u
.prefix4
);
4254 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4255 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4256 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4257 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4258 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4259 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4260 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4261 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4263 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4265 while (listcount(oi
->ls_ack
))
4266 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4270 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4271 * address. As a result, the kernel does not need to learn the interface
4272 * MAC of the OSPF neighbor. However, in our world, this will delay
4273 * convergence. Take the case when due to a link flap, all routes now
4274 * want to use an interface which was deemed to be costlier prior to this
4275 * event. For routes that will be installed, the missing MAC will have
4276 * punt-to-CPU set on them. This may overload the CPU control path that
4277 * can be avoided if the MAC was known apriori.
4279 #define OSPF_PING_NBR_STR_MAX (BUFSIZ)
4280 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4282 char ping_nbr
[OSPF_PING_NBR_STR_MAX
];
4285 if (!nbr
|| !nbr
->oi
|| !nbr
->oi
->ifp
)
4288 snprintf(ping_nbr
, sizeof(ping_nbr
),
4289 "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr
->oi
->ifp
->name
,
4290 inet_ntoa(nbr
->address
.u
.prefix4
));
4292 ret
= system(ping_nbr
);
4293 if (IS_DEBUG_OSPF_EVENT
)
4294 zlog_debug("Executed %s %s", ping_nbr
,
4295 ((ret
== 0) ? "successfully" : "but failed"));