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
) {
1365 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1367 "Packet[DD]: Neighbor %s state is %s, packet discarded.",
1368 inet_ntoa(nbr
->router_id
),
1369 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1373 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1374 /* If the new state is ExStart, the processing of the current
1375 packet should then continue in this new state by falling
1376 through to case ExStart below. */
1377 if (nbr
->state
!= NSM_ExStart
)
1382 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1383 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1384 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1386 /* We're Slave---obey */
1387 if (CHECK_FLAG(oi
->ospf
->config
,
1388 OSPF_LOG_ADJACENCY_DETAIL
))
1390 "Packet[DD]: Neighbor %s Negotiation done (Slave).",
1391 inet_ntoa(nbr
->router_id
));
1393 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1396 UNSET_FLAG(nbr
->dd_flags
,
1397 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1399 /* We're Master, ignore the initial DBD from
1401 if (CHECK_FLAG(oi
->ospf
->config
,
1402 OSPF_LOG_ADJACENCY_DETAIL
))
1404 "Packet[DD]: Neighbor %s: Initial DBD from Slave, "
1406 inet_ntoa(nbr
->router_id
));
1410 /* Ack from the Slave */
1411 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1412 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1413 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1416 "Packet[DD]: Neighbor %s Negotiation done (Master).",
1417 inet_ntoa(nbr
->router_id
));
1418 /* Reset I, leaving MS */
1419 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1421 flog_warn(EC_OSPF_PACKET
,
1422 "Packet[DD]: Neighbor %s Negotiation fails.",
1423 inet_ntoa(nbr
->router_id
));
1427 /* This is where the real Options are saved */
1428 nbr
->options
= dd
->options
;
1430 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1431 if (IS_DEBUG_OSPF_EVENT
)
1433 "Neighbor[%s] is %sOpaque-capable.",
1434 inet_ntoa(nbr
->router_id
),
1435 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1439 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1440 && IPV4_ADDR_SAME(&DR(oi
),
1441 &nbr
->address
.u
.prefix4
)) {
1444 "DR-neighbor[%s] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1445 inet_ntoa(nbr
->router_id
));
1446 /* This situation is undesirable, but not a real
1451 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1453 /* continue processing rest of packet. */
1454 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1457 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1458 if (IS_SET_DD_MS(nbr
->dd_flags
))
1459 /* Master: discard duplicated DD packet. */
1461 "Packet[DD] (Master): Neighbor %s packet duplicated.",
1462 inet_ntoa(nbr
->router_id
));
1464 /* Slave: cause to retransmit the last Database
1468 "Packet[DD] [Slave]: Neighbor %s packet duplicated.",
1469 inet_ntoa(nbr
->router_id
));
1470 ospf_db_desc_resend(nbr
);
1475 /* Otherwise DD packet should be checked. */
1476 /* Check Master/Slave bit mismatch */
1477 if (IS_SET_DD_MS(dd
->flags
)
1478 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1479 flog_warn(EC_OSPF_PACKET
,
1480 "Packet[DD]: Neighbor %s MS-bit mismatch.",
1481 inet_ntoa(nbr
->router_id
));
1482 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1483 if (IS_DEBUG_OSPF_EVENT
)
1485 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1486 dd
->flags
, nbr
->dd_flags
);
1490 /* Check initialize bit is set. */
1491 if (IS_SET_DD_I(dd
->flags
)) {
1492 zlog_info("Packet[DD]: Neighbor %s I-bit set.",
1493 inet_ntoa(nbr
->router_id
));
1494 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1498 /* Check DD Options. */
1499 if (dd
->options
!= nbr
->options
) {
1500 #ifdef ORIGINAL_CODING
1501 /* Save the new options for debugging */
1502 nbr
->options
= dd
->options
;
1503 #endif /* ORIGINAL_CODING */
1504 flog_warn(EC_OSPF_PACKET
,
1505 "Packet[DD]: Neighbor %s options mismatch.",
1506 inet_ntoa(nbr
->router_id
));
1507 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1511 /* Check DD sequence number. */
1512 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1513 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1514 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1515 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1518 "Packet[DD]: Neighbor %s sequence number mismatch.",
1519 inet_ntoa(nbr
->router_id
));
1520 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1524 /* Continue processing rest of packet. */
1525 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1529 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1530 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1531 /* Master should discard duplicate DD packet. */
1533 "Packet[DD]: Neighbor %s duplicated, "
1534 "packet discarded.",
1535 inet_ntoa(nbr
->router_id
));
1538 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1539 < nbr
->v_inactivity
* 1000000LL) {
1540 /* In states Loading and Full the slave
1542 its last Database Description packet
1544 duplicate Database Description
1546 from the master. For this reason the
1548 wait RouterDeadInterval seconds
1550 last Database Description packet.
1552 Database Description packet from the
1554 this interval will generate a
1556 neighbor event. RFC2328 Section 10.8
1558 ospf_db_desc_resend(nbr
);
1564 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1567 flog_warn(EC_OSPF_PACKET
,
1568 "Packet[DD]: Neighbor %s NSM illegal status %u.",
1569 inet_ntoa(nbr
->router_id
), nbr
->state
);
1574 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1576 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1577 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1578 struct stream
*s
, struct ospf_interface
*oi
,
1581 struct ospf_neighbor
*nbr
;
1583 struct in_addr ls_id
;
1584 struct in_addr adv_router
;
1585 struct ospf_lsa
*find
;
1586 struct list
*ls_upd
;
1587 unsigned int length
;
1589 /* Increment statistics. */
1592 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1594 flog_warn(EC_OSPF_PACKET
,
1595 "Link State Request: Unknown Neighbor %s.",
1596 inet_ntoa(ospfh
->router_id
));
1600 /* Add event to thread. */
1601 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1603 /* Neighbor State should be Exchange or later. */
1604 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1605 && nbr
->state
!= NSM_Full
) {
1608 "Link State Request received from %s: Neighbor state is %s, packet discarded.",
1609 inet_ntoa(ospfh
->router_id
),
1610 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1614 /* Send Link State Update for ALL requested LSAs. */
1615 ls_upd
= list_new();
1616 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1618 while (size
>= OSPF_LSA_KEY_SIZE
) {
1619 /* Get one slice of Link State Request. */
1620 ls_type
= stream_getl(s
);
1621 ls_id
.s_addr
= stream_get_ipv4(s
);
1622 adv_router
.s_addr
= stream_get_ipv4(s
);
1624 /* Verify LSA type. */
1625 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1626 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1627 list_delete(&ls_upd
);
1631 /* Search proper LSA in LSDB. */
1632 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1635 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1636 list_delete(&ls_upd
);
1640 /* Packet overflows MTU size, send immediately. */
1641 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1642 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1643 ospf_ls_upd_send(nbr
, ls_upd
,
1644 OSPF_SEND_PACKET_DIRECT
, 0);
1646 ospf_ls_upd_send(nbr
, ls_upd
,
1647 OSPF_SEND_PACKET_INDIRECT
, 0);
1649 /* Only remove list contents. Keep ls_upd. */
1650 list_delete_all_node(ls_upd
);
1652 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1655 /* Append LSA to update list. */
1656 listnode_add(ls_upd
, find
);
1657 length
+= ntohs(find
->data
->length
);
1659 size
-= OSPF_LSA_KEY_SIZE
;
1662 /* Send rest of Link State Update. */
1663 if (listcount(ls_upd
) > 0) {
1664 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1665 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1668 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1671 list_delete(&ls_upd
);
1673 list_delete(&ls_upd
);
1676 /* Get the list of LSAs from Link State Update packet.
1677 And process some validation -- RFC2328 Section 13. (1)-(2). */
1678 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1680 struct ospf_interface
*oi
, size_t size
)
1682 uint16_t count
, sum
;
1684 struct lsa_header
*lsah
;
1685 struct ospf_lsa
*lsa
;
1690 count
= stream_getl(s
);
1691 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1693 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1694 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1695 lsah
= (struct lsa_header
*)stream_pnt(s
);
1696 length
= ntohs(lsah
->length
);
1698 if (length
> size
) {
1701 "Link State Update: LSA length exceeds packet size.");
1705 /* Validate the LSA's LS checksum. */
1706 sum
= lsah
->checksum
;
1707 if (!ospf_lsa_checksum_valid(lsah
)) {
1708 /* (bug #685) more details in a one-line message make it
1710 * to identify problem source on the one hand and to
1712 * chance to compress repeated messages in syslog on the
1716 "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s",
1717 sum
, lsah
->checksum
, inet_ntoa(lsah
->id
),
1718 inet_ntoa(nbr
->src
), inet_ntoa(nbr
->router_id
),
1719 inet_ntoa(lsah
->adv_router
));
1723 /* Examine the LSA's LS type. */
1724 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1725 flog_warn(EC_OSPF_PACKET
,
1726 "Link State Update: Unknown LS type %d",
1732 * What if the received LSA's age is greater than MaxAge?
1733 * Treat it as a MaxAge case -- endo.
1735 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1736 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1738 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1739 #ifdef STRICT_OBIT_USAGE_CHECK
1740 if ((IS_OPAQUE_LSA(lsah
->type
)
1741 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1742 || (!IS_OPAQUE_LSA(lsah
->type
)
1743 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1745 * This neighbor must know the exact usage of
1747 * the bit will be set in Type-9,10,11 LSAs
1750 flog_warn(EC_OSPF_PACKET
,
1751 "LSA[Type%d:%s]: O-bit abuse?",
1752 lsah
->type
, inet_ntoa(lsah
->id
));
1755 #endif /* STRICT_OBIT_USAGE_CHECK */
1757 /* Do not take in AS External Opaque-LSAs if we are a
1759 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1760 && nbr
->oi
->area
->external_routing
1761 != OSPF_AREA_DEFAULT
) {
1762 if (IS_DEBUG_OSPF_EVENT
)
1764 "LSA[Type%d:%s]: We are a stub, don't take this LSA.",
1766 inet_ntoa(lsah
->id
));
1769 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1770 flog_warn(EC_OSPF_PACKET
,
1771 "LSA[Type%d:%s]: Opaque capability mismatch?",
1772 lsah
->type
, inet_ntoa(lsah
->id
));
1776 /* Create OSPF LSA instance. */
1777 lsa
= ospf_lsa_new_and_data(length
);
1779 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1780 /* We may wish to put some error checking if type NSSA comes in
1781 and area not in NSSA mode */
1782 switch (lsah
->type
) {
1783 case OSPF_AS_EXTERNAL_LSA
:
1784 case OSPF_OPAQUE_AS_LSA
:
1787 case OSPF_OPAQUE_LINK_LSA
:
1788 lsa
->oi
= oi
; /* Remember incoming interface for
1789 flooding control. */
1792 lsa
->area
= oi
->area
;
1796 memcpy(lsa
->data
, lsah
, length
);
1798 if (IS_DEBUG_OSPF_EVENT
)
1800 "LSA[Type%d:%s]: %p new LSA created with Link State Update",
1801 lsa
->data
->type
, inet_ntoa(lsa
->data
->id
),
1803 listnode_add(lsas
, lsa
);
1809 /* Cleanup Update list. */
1810 static void ospf_upd_list_clean(struct list
*lsas
)
1812 struct listnode
*node
, *nnode
;
1813 struct ospf_lsa
*lsa
;
1815 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1816 ospf_lsa_discard(lsa
);
1821 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1822 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1823 struct ospf_header
*ospfh
, struct stream
*s
,
1824 struct ospf_interface
*oi
, uint16_t size
)
1826 struct ospf_neighbor
*nbr
;
1828 struct listnode
*node
, *nnode
;
1829 struct ospf_lsa
*lsa
= NULL
;
1830 /* unsigned long ls_req_found = 0; */
1832 /* Dis-assemble the stream, update each entry, re-encapsulate for
1835 /* Increment statistics. */
1838 /* Check neighbor. */
1839 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1841 flog_warn(EC_OSPF_PACKET
,
1842 "Link State Update: Unknown Neighbor %s on int: %s",
1843 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
1847 /* Add event to thread. */
1848 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1850 /* Check neighbor state. */
1851 if (nbr
->state
< NSM_Exchange
) {
1852 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1854 "Link State Update: "
1855 "Neighbor[%s] state %s is less than Exchange",
1856 inet_ntoa(ospfh
->router_id
),
1857 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1862 /* Get list of LSAs from Link State Update packet. - Also perorms Stages
1863 * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
1866 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1870 #define DISCARD_LSA(L, N) \
1872 if (IS_DEBUG_OSPF_EVENT) \
1874 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1876 N, (void *)lsa, (int)lsa->data->type); \
1877 ospf_lsa_discard(L); \
1881 /* Process each LSA received in the one packet.
1883 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1884 * text below are from the steps in RFC 2328, Section 13.
1886 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1887 struct ospf_lsa
*ls_ret
, *current
;
1890 if (IS_DEBUG_OSPF_NSSA
) {
1891 char buf1
[INET_ADDRSTRLEN
];
1892 char buf2
[INET_ADDRSTRLEN
];
1893 char buf3
[INET_ADDRSTRLEN
];
1895 zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s",
1897 inet_ntop(AF_INET
, &ospfh
->router_id
, buf1
,
1899 inet_ntop(AF_INET
, &lsa
->data
->id
, buf2
,
1901 inet_ntop(AF_INET
, &lsa
->data
->adv_router
,
1902 buf3
, INET_ADDRSTRLEN
));
1905 listnode_delete(lsas
,
1906 lsa
); /* We don't need it in list anymore */
1908 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1911 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1913 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1916 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1919 /* Do take in Type-7's if we are an NSSA */
1921 /* If we are also an ABR, later translate them to a Type-5
1924 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1925 translate them to a separate Type-5 packet. */
1927 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1928 /* Reject from STUB or NSSA */
1929 if (nbr
->oi
->area
->external_routing
1930 != OSPF_AREA_DEFAULT
) {
1931 if (IS_DEBUG_OSPF_NSSA
)
1933 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1934 DISCARD_LSA(lsa
, 1);
1937 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1938 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1939 if (IS_DEBUG_OSPF_NSSA
)
1941 "Incoming NSSA LSA Discarded: Not NSSA Area");
1942 DISCARD_LSA(lsa
, 2);
1945 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1946 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1947 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1948 &lsa
->data
->adv_router
)) {
1949 char buf1
[INET_ADDRSTRLEN
];
1950 char buf2
[INET_ADDRSTRLEN
];
1951 char buf3
[INET_ADDRSTRLEN
];
1953 flog_err(EC_OSPF_ROUTER_LSA_MISMATCH
,
1954 "Incoming Router-LSA from %s with "
1955 "Adv-ID[%s] != LS-ID[%s]",
1956 inet_ntop(AF_INET
, &ospfh
->router_id
,
1957 buf1
, INET_ADDRSTRLEN
),
1958 inet_ntop(AF_INET
, &lsa
->data
->id
,
1959 buf2
, INET_ADDRSTRLEN
),
1961 &lsa
->data
->adv_router
, buf3
,
1964 EC_OSPF_DOMAIN_CORRUPT
,
1965 "OSPF domain compromised by attack or corruption. "
1966 "Verify correct operation of -ALL- OSPF routers.");
1967 DISCARD_LSA(lsa
, 0);
1970 /* Find the LSA in the current database. */
1972 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1974 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1976 no instance of the LSA in the router's link state database,
1977 and none of router's neighbors are in states Exchange or
1979 then take the following actions: */
1981 if (IS_LSA_MAXAGE(lsa
) && !current
1982 && ospf_check_nbr_status(oi
->ospf
)) {
1983 /* (4a) Response Link State Acknowledgment. */
1984 ospf_ls_ack_send(nbr
, lsa
);
1986 /* (4b) Discard LSA. */
1987 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1989 "Link State Update[%s]: LS age is equal to MaxAge.",
1992 DISCARD_LSA(lsa
, 3);
1995 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1996 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1997 &oi
->ospf
->router_id
)) {
1999 * Even if initial flushing seems to be completed, there
2001 * be a case that self-originated LSA with MaxAge still
2003 * in the routing domain.
2004 * Just send an LSAck message to cease retransmission.
2006 if (IS_LSA_MAXAGE(lsa
)) {
2007 zlog_info("LSA[%s]: Boomerang effect?",
2009 ospf_ls_ack_send(nbr
, lsa
);
2010 ospf_lsa_discard(lsa
);
2012 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2013 ospf_opaque_lsa_refresh_schedule(
2019 * If an instance of self-originated Opaque-LSA is not
2021 * in the LSDB, there are some possible cases here.
2023 * 1) This node lost opaque-capability after restart.
2024 * 2) Else, a part of opaque-type is no more supported.
2025 * 3) Else, a part of opaque-id is no more supported.
2027 * Anyway, it is still this node's responsibility to
2029 * Otherwise, the LSA instance remains in the routing
2031 * until its age reaches to MaxAge.
2033 /* XXX: We should deal with this for *ALL* LSAs, not
2035 if (current
== NULL
) {
2036 if (IS_DEBUG_OSPF_EVENT
)
2038 "LSA[%s]: Previously originated Opaque-LSA,"
2039 "not found in the LSDB.",
2042 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2044 ospf_opaque_self_originated_lsa_received(nbr
,
2046 ospf_ls_ack_send(nbr
, lsa
);
2052 /* It might be happen that received LSA is self-originated
2054 * router ID is changed. So, we should check if LSA is a
2056 * Link State ID is one of the router's own IP interface
2057 * addresses but whose
2058 * Advertising Router is not equal to the router's own Router ID
2059 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2063 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2064 struct listnode
*oinode
, *oinnode
;
2065 struct ospf_interface
*out_if
;
2068 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2073 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2075 && (!(IPV4_ADDR_SAME(
2076 &oi
->ospf
->router_id
,
2077 &lsa
->data
->adv_router
)))) {
2078 if (out_if
->network_lsa_self
) {
2079 ospf_lsa_flush_area(
2081 if (IS_DEBUG_OSPF_EVENT
)
2083 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2087 ospf_lsa_discard(lsa
);
2097 /* (5) Find the instance of this LSA that is currently contained
2098 in the router's link state database. If there is no
2099 database copy, or the received LSA is more recent than
2100 the database copy the following steps must be performed.
2101 (The sub steps from RFC 2328 section 13 step (5) will be
2106 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2108 if (current
&& (lsa
->data
->ls_seqnum
==
2109 htonl(OSPF_MAX_SEQUENCE_NUMBER
)
2110 && !IS_LSA_MAXAGE(lsa
))) {
2112 "Link State Update[%s]: has Max Seq but not MaxAge. Dropping it",
2115 DISCARD_LSA(lsa
, 4);
2118 /* Actual flooding procedure. */
2119 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2120 < 0) /* Trap NSSA later. */
2121 DISCARD_LSA(lsa
, 5);
2125 /* (6) Else, If there is an instance of the LSA on the sending
2126 neighbor's Link state request list, an error has occurred in
2127 the Database Exchange process. In this case, restart the
2128 Database Exchange process by generating the neighbor event
2129 BadLSReq for the sending neighbor and stop processing the
2130 Link State Update packet. */
2132 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2133 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2136 "LSA[%s] instance exists on Link state request list",
2139 /* Clean list of LSAs. */
2140 ospf_upd_list_clean(lsas
);
2141 /* this lsa is not on lsas list already. */
2142 ospf_lsa_discard(lsa
);
2146 /* If the received LSA is the same instance as the database copy
2147 (i.e., neither one is more recent) the following two steps
2148 should be performed: */
2151 /* If the LSA is listed in the Link state retransmission
2153 for the receiving adjacency, the router itself is
2155 an acknowledgment for this LSA. The router should
2157 received LSA as an acknowledgment by removing the LSA
2159 the Link state retransmission list. This is termed
2161 "implied acknowledgment". */
2163 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2165 if (ls_ret
!= NULL
) {
2166 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2168 /* Delayed acknowledgment sent if advertisement
2170 from Designated Router, otherwise do nothing.
2172 if (oi
->state
== ISM_Backup
)
2176 ospf_lsa_lock(lsa
));
2178 DISCARD_LSA(lsa
, 6);
2180 /* Acknowledge the receipt of the LSA by sending a
2181 Link State Acknowledgment packet back out the
2185 ospf_ls_ack_send(nbr
, lsa
);
2186 DISCARD_LSA(lsa
, 7);
2190 /* The database copy is more recent. If the database copy
2191 has LS age equal to MaxAge and LS sequence number equal to
2192 MaxSequenceNumber, simply discard the received LSA without
2193 acknowledging it. (In this case, the LSA's LS sequence number
2195 wrapping, and the MaxSequenceNumber LSA must be completely
2196 flushed before any new LSA instance can be introduced). */
2198 else if (ret
> 0) /* Database copy is more recent */
2200 if (IS_LSA_MAXAGE(current
)
2201 && current
->data
->ls_seqnum
2202 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2203 DISCARD_LSA(lsa
, 8);
2205 /* Otherwise, as long as the database copy has not been
2207 Link State Update within the last MinLSArrival
2209 database copy back to the sending neighbor,
2211 a Link State Update Packet. The Link State Update
2213 be sent directly to the neighbor. In so doing, do not
2215 database copy of the LSA on the neighbor's link state
2216 retransmission list, and do not acknowledge the
2218 recent) LSA instance. */
2220 if (monotime_since(¤t
->tv_orig
, NULL
)
2221 >= ospf
->min_ls_arrival
* 1000LL)
2222 /* Trap NSSA type later.*/
2223 ospf_ls_upd_send_lsa(
2225 OSPF_SEND_PACKET_DIRECT
);
2226 DISCARD_LSA(lsa
, 9);
2232 assert(listcount(lsas
) == 0);
2236 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2237 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2238 struct stream
*s
, struct ospf_interface
*oi
,
2241 struct ospf_neighbor
*nbr
;
2243 /* increment statistics. */
2246 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2248 flog_warn(EC_OSPF_PACKET
,
2249 "Link State Acknowledgment: Unknown Neighbor %s.",
2250 inet_ntoa(ospfh
->router_id
));
2254 /* Add event to thread. */
2255 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
2257 if (nbr
->state
< NSM_Exchange
) {
2258 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2260 "Link State Acknowledgment: "
2261 "Neighbor[%s] state %s is less than Exchange",
2262 inet_ntoa(ospfh
->router_id
),
2263 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2268 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2269 struct ospf_lsa
*lsa
, *lsr
;
2271 lsa
= ospf_lsa_new();
2272 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2273 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2275 /* lsah = (struct lsa_header *) stream_pnt (s); */
2276 size
-= OSPF_LSA_HEADER_SIZE
;
2277 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2279 if (lsa
->data
->type
< OSPF_MIN_LSA
2280 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2282 ospf_lsa_discard(lsa
);
2286 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2288 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0)
2289 ospf_ls_retransmit_delete(nbr
, lsr
);
2292 ospf_lsa_discard(lsa
);
2298 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2299 struct interface
**ifp
,
2300 struct stream
*ibuf
)
2305 ifindex_t ifindex
= 0;
2307 /* Header and data both require alignment. */
2308 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2311 memset(&msgh
, 0, sizeof(struct msghdr
));
2312 msgh
.msg_iov
= &iov
;
2313 msgh
.msg_iovlen
= 1;
2314 msgh
.msg_control
= (caddr_t
)buff
;
2315 msgh
.msg_controllen
= sizeof(buff
);
2317 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, 0, OSPF_MAX_PACKET_SIZE
+ 1);
2319 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2320 safe_strerror(errno
));
2323 if ((unsigned int)ret
< sizeof(iph
)) /* ret must be > 0 now */
2327 "ospf_recv_packet: discarding runt packet of length %d "
2328 "(ip header size is %u)",
2329 ret
, (unsigned int)sizeof(iph
));
2333 /* Note that there should not be alignment problems with this assignment
2334 because this is at the beginning of the stream data buffer. */
2335 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2336 sockopt_iphdrincl_swab_systoh(iph
);
2338 ip_len
= iph
->ip_len
;
2340 #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000)
2342 * Kernel network code touches incoming IP header parameters,
2343 * before protocol specific processing.
2345 * 1) Convert byteorder to host representation.
2346 * --> ip_len, ip_id, ip_off
2348 * 2) Adjust ip_len to strip IP header size!
2349 * --> If user process receives entire IP packet via RAW
2350 * socket, it must consider adding IP header size to
2351 * the "ip_len" field of "ip" structure.
2353 * For more details, see <netinet/ip_input.c>.
2355 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2358 #if defined(__DragonFly__)
2360 * in DragonFly's raw socket, ip_len/ip_off are read
2361 * in network byte order.
2362 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2364 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2367 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2369 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2371 if (ret
!= ip_len
) {
2374 "ospf_recv_packet read length mismatch: ip_len is %d, "
2375 "but recvmsg returned %d",
2383 static struct ospf_interface
*
2384 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2385 struct ip
*iph
, struct ospf_header
*ospfh
)
2387 struct ospf_interface
*rcv_oi
;
2388 struct ospf_vl_data
*vl_data
;
2389 struct ospf_area
*vl_area
;
2390 struct listnode
*node
;
2392 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2393 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2396 /* look for local OSPF interface matching the destination
2397 * to determine Area ID. We presume therefore the destination address
2398 * is unique, or at least (for "unnumbered" links), not used in other
2401 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2405 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2407 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2411 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2412 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2413 if (IS_DEBUG_OSPF_EVENT
)
2414 zlog_debug("associating packet with %s",
2415 IF_NAME(vl_data
->vl_oi
));
2416 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2417 if (IS_DEBUG_OSPF_EVENT
)
2419 "This VL is not up yet, sorry");
2423 return vl_data
->vl_oi
;
2427 if (IS_DEBUG_OSPF_EVENT
)
2428 zlog_debug("couldn't find any VL to associate the packet with");
2433 static int ospf_check_area_id(struct ospf_interface
*oi
,
2434 struct ospf_header
*ospfh
)
2436 /* Check match the Area ID of the receiving interface. */
2437 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2443 /* Unbound socket will accept any Raw IP packets if proto is matched.
2444 To prevent it, compare src IP address and i/f address with masking
2445 i/f network mask. */
2446 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2447 struct in_addr ip_src
)
2449 struct in_addr mask
, me
, him
;
2451 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2452 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2455 masklen2ip(oi
->address
->prefixlen
, &mask
);
2457 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2458 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2460 if (IPV4_ADDR_SAME(&me
, &him
))
2466 /* Return 1, if the packet is properly authenticated and checksummed,
2467 0 otherwise. In particular, check that AuType header field is valid and
2468 matches the locally configured AuType, and that D.5 requirements are met. */
2469 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2471 struct crypt_key
*ck
;
2472 uint16_t iface_auth_type
;
2473 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2475 switch (pkt_auth_type
) {
2476 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2477 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2478 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2481 "interface %s: auth-type mismatch, local %s, rcvd Null",
2483 lookup_msg(ospf_auth_type_str
,
2484 iface_auth_type
, NULL
));
2487 if (!ospf_check_sum(ospfh
)) {
2488 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2491 "interface %s: Null auth OK, but checksum error, Router-ID %s",
2493 inet_ntoa(ospfh
->router_id
));
2497 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2498 if (OSPF_AUTH_SIMPLE
2499 != (iface_auth_type
= ospf_auth_type(oi
))) {
2500 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2503 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2505 lookup_msg(ospf_auth_type_str
,
2506 iface_auth_type
, NULL
));
2509 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2510 OSPF_AUTH_SIMPLE_SIZE
)) {
2511 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2512 flog_warn(EC_OSPF_PACKET
,
2513 "interface %s: Simple auth failed",
2517 if (!ospf_check_sum(ospfh
)) {
2518 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2521 "interface %s: Simple auth OK, checksum error, Router-ID %s",
2523 inet_ntoa(ospfh
->router_id
));
2527 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2528 if (OSPF_AUTH_CRYPTOGRAPHIC
2529 != (iface_auth_type
= ospf_auth_type(oi
))) {
2530 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2533 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2535 lookup_msg(ospf_auth_type_str
,
2536 iface_auth_type
, NULL
));
2539 if (ospfh
->checksum
) {
2540 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2543 "interface %s: OSPF header checksum is not 0",
2547 /* only MD5 crypto method can pass ospf_packet_examin() */
2548 if (NULL
== (ck
= listgetdata(
2549 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2550 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2551 /* Condition above uses the last key ID on the list,
2553 different from what ospf_crypt_key_lookup() does. A
2555 !ospf_check_md5_digest(oi
, ospfh
)) {
2556 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2557 flog_warn(EC_OSPF_MD5
,
2558 "interface %s: MD5 auth failed",
2564 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2567 "interface %s: invalid packet auth-type (%02x)",
2568 IF_NAME(oi
), pkt_auth_type
);
2573 static int ospf_check_sum(struct ospf_header
*ospfh
)
2578 /* clear auth_data for checksum. */
2579 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2581 /* keep checksum and clear. */
2582 sum
= ospfh
->checksum
;
2583 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2585 /* calculate checksum. */
2586 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2589 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2597 /* Verify, that given link/TOS records are properly sized/aligned and match
2598 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2599 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2601 const uint16_t num_links
)
2603 unsigned counted_links
= 0, thislinklen
;
2607 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2608 if (thislinklen
> linkbytes
) {
2609 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2610 zlog_debug("%s: length error in link block #%u",
2611 __func__
, counted_links
);
2614 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2615 linkbytes
-= thislinklen
;
2618 if (counted_links
!= num_links
) {
2619 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2620 zlog_debug("%s: %u link blocks declared, %u present",
2621 __func__
, num_links
, counted_links
);
2627 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2628 minimum length constraint). */
2629 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2630 const uint8_t headeronly
)
2633 struct router_lsa
*rlsa
;
2634 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2635 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2636 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2637 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2638 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2642 switch (lsah
->type
) {
2643 case OSPF_ROUTER_LSA
:
2644 /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1
2645 * (12+)-byte link blocks */
2647 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2648 - OSPF_ROUTER_LSA_MIN_SIZE
)
2654 rlsa
= (struct router_lsa
*)lsah
;
2655 ret
= ospf_router_lsa_links_examin(
2656 (struct router_lsa_link
*)rlsa
->link
,
2657 lsalen
- OSPF_LSA_HEADER_SIZE
- 4, /* skip: basic
2660 ntohs(rlsa
->links
) /* 16 bits */
2663 case OSPF_AS_EXTERNAL_LSA
:
2664 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2666 case OSPF_AS_NSSA_LSA
:
2667 /* RFC3101 C, idem */
2668 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2669 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2674 /* Following LSA types are considered OK length-wise as soon as their
2676 * length constraint is met and length of the whole LSA is a multiple of
2678 * (basic LSA header size is already a multiple of 4). */
2679 case OSPF_NETWORK_LSA
:
2680 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2681 case OSPF_SUMMARY_LSA
:
2682 case OSPF_ASBR_SUMMARY_LSA
:
2683 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2685 case OSPF_OPAQUE_LINK_LSA
:
2686 case OSPF_OPAQUE_AREA_LSA
:
2687 case OSPF_OPAQUE_AS_LSA
:
2688 /* RFC5250 A.2, "some number of octets (of application-specific
2689 * data) padded to 32-bit alignment." This is considered
2691 * to 4-byte alignment of all other LSA types, see
2692 * OSPF-ALIGNMENT.txt
2693 * file for the detailed analysis of this passage. */
2694 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2697 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2698 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2702 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2703 zlog_debug("%s: alignment error in %s", __func__
,
2704 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2708 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2709 includes verification of LSA blocks length/alignment and dispatching
2710 of deeper-level checks. */
2712 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2713 size_t length
, const uint8_t headeronly
,
2714 /* When declared_num_lsas is not 0, compare it to the real
2716 and treat the difference as an error. */
2717 const uint32_t declared_num_lsas
)
2719 uint32_t counted_lsas
= 0;
2723 if (length
< OSPF_LSA_HEADER_SIZE
) {
2724 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2726 "%s: undersized (%zu B) trailing (#%u) LSA header",
2727 __func__
, length
, counted_lsas
);
2730 /* save on ntohs() calls here and in the LSA validator */
2731 lsalen
= ntohs(lsah
->length
);
2732 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2733 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2735 "%s: malformed LSA header #%u, declared length is %u B",
2736 __func__
, counted_lsas
, lsalen
);
2740 /* less checks here and in ospf_lsa_examin() */
2741 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2742 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2744 "%s: malformed header-only LSA #%u",
2745 __func__
, counted_lsas
);
2748 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2749 + OSPF_LSA_HEADER_SIZE
);
2750 length
-= OSPF_LSA_HEADER_SIZE
;
2752 /* make sure the input buffer is deep enough before
2754 if (lsalen
> length
) {
2755 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2757 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2758 __func__
, counted_lsas
, lsalen
,
2762 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2763 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2764 zlog_debug("%s: malformed LSA #%u",
2765 __func__
, counted_lsas
);
2768 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2774 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2775 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2777 "%s: #LSAs declared (%u) does not match actual (%u)",
2778 __func__
, declared_num_lsas
, counted_lsas
);
2784 /* Verify a complete OSPF packet for proper sizing/alignment. */
2785 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2786 const unsigned bytesonwire
)
2788 uint16_t bytesdeclared
, bytesauth
;
2790 struct ospf_ls_update
*lsupd
;
2792 /* Length, 1st approximation. */
2793 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2794 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2795 zlog_debug("%s: undersized (%u B) packet", __func__
,
2799 /* Now it is safe to access header fields. Performing length check,
2801 * for possible extra bytes of crypto auth/padding, which are not
2803 * in the OSPF header "length" field. */
2804 if (oh
->version
!= OSPF_VERSION
) {
2805 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2806 zlog_debug("%s: invalid (%u) protocol version",
2807 __func__
, oh
->version
);
2810 bytesdeclared
= ntohs(oh
->length
);
2811 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2814 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2815 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2817 "%s: unsupported crypto auth length (%u B)",
2818 __func__
, oh
->u
.crypt
.auth_data_len
);
2821 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2823 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2824 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2826 "%s: packet length error (%u real, %u+%u declared)",
2827 __func__
, bytesonwire
, bytesdeclared
,
2831 /* Length, 2nd approximation. The type-specific constraint is checked
2832 against declared length, not amount of bytes on wire. */
2833 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2835 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2836 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2837 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2839 lookup_msg(ospf_packet_type_str
, oh
->type
,
2844 case OSPF_MSG_HELLO
:
2845 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2847 by N>=0 router-IDs. */
2848 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2853 case OSPF_MSG_DB_DESC
:
2854 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2856 by N>=0 header-only LSAs. */
2857 ret
= ospf_lsaseq_examin(
2858 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2859 + OSPF_DB_DESC_MIN_SIZE
),
2860 bytesdeclared
- OSPF_HEADER_SIZE
2861 - OSPF_DB_DESC_MIN_SIZE
,
2862 1, /* header-only LSAs */
2865 case OSPF_MSG_LS_REQ
:
2866 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2867 * request blocks. */
2868 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2873 case OSPF_MSG_LS_UPD
:
2874 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2876 by N>=0 full LSAs (with N declared beforehand). */
2877 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2878 + OSPF_HEADER_SIZE
);
2879 ret
= ospf_lsaseq_examin(
2880 (struct lsa_header
*)((caddr_t
)lsupd
2881 + OSPF_LS_UPD_MIN_SIZE
),
2882 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2884 ntohl(lsupd
->num_lsas
) /* 32 bits */
2887 case OSPF_MSG_LS_ACK
:
2888 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2890 ret
= ospf_lsaseq_examin(
2891 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2892 + OSPF_LS_ACK_MIN_SIZE
),
2893 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2894 1, /* header-only LSAs */
2898 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2899 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2903 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2904 zlog_debug("%s: malformed %s packet", __func__
,
2905 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2909 /* OSPF Header verification. */
2910 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2911 struct ip
*iph
, struct ospf_header
*ospfh
)
2913 /* Check Area ID. */
2914 if (!ospf_check_area_id(oi
, ospfh
)) {
2915 flog_warn(EC_OSPF_PACKET
,
2916 "interface %s: ospf_read invalid Area ID %s.",
2917 IF_NAME(oi
), inet_ntoa(ospfh
->area_id
));
2921 /* Check network mask, Silently discarded. */
2922 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2925 "interface %s: ospf_read network address is not same [%s]",
2926 IF_NAME(oi
), inet_ntoa(iph
->ip_src
));
2930 /* Check authentication. The function handles logging actions, where
2932 if (!ospf_check_auth(oi
, ospfh
))
2938 /* Starting point of packet process function. */
2939 int ospf_read(struct thread
*thread
)
2942 struct stream
*ibuf
;
2944 struct ospf_interface
*oi
;
2946 struct ospf_header
*ospfh
;
2948 struct interface
*ifp
= NULL
;
2949 struct connected
*c
;
2951 /* first of all get interface pointer. */
2952 ospf
= THREAD_ARG(thread
);
2954 /* prepare for next packet. */
2955 ospf
->t_read
= NULL
;
2956 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
2958 stream_reset(ospf
->ibuf
);
2959 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2962 /* This raw packet is known to be at least as big as its IP header. */
2964 /* Note that there should not be alignment problems with this assignment
2965 because this is at the beginning of the stream data buffer. */
2966 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2967 /* Note that sockopt_iphdrincl_swab_systoh was called in
2968 * ospf_recv_packet. */
2971 /* Handle cases where the platform does not support retrieving
2973 and also platforms (such as Solaris 8) that claim to support
2975 retrieval but do not. */
2976 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2984 /* IP Header dump. */
2985 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2986 ospf_ip_header_dump(iph
);
2988 /* Self-originated packet should be discarded silently. */
2989 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
2990 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
2992 "ospf_read[%s]: Dropping self-originated packet",
2993 inet_ntoa(iph
->ip_src
));
2998 /* Advance from IP header to OSPF header (iph->ip_hl has been verified
2999 by ospf_recv_packet() to be correct). */
3000 stream_forward_getp(ibuf
, iph
->ip_hl
* 4);
3002 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3004 != ospf_packet_examin(
3005 ospfh
, stream_get_endp(ibuf
) - stream_get_getp(ibuf
)))
3007 /* Now it is safe to access all fields of OSPF packet header. */
3009 /* associate packet with ospf interface */
3010 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3012 /* ospf_verify_header() relies on a valid "oi" and thus can be called
3014 after the passive/backbone/other checks below are passed. These
3016 in turn access the fields of unverified "ospfh" structure for their
3018 purposes and must remain very accurate in doing this. */
3020 /* If incoming interface is passive one, ignore it. */
3021 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3022 char buf
[3][INET_ADDRSTRLEN
];
3024 if (IS_DEBUG_OSPF_EVENT
)
3026 "ignoring packet from router %s sent to %s, "
3027 "received on a passive interface, %s",
3028 inet_ntop(AF_INET
, &ospfh
->router_id
, buf
[0],
3030 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3032 inet_ntop(AF_INET
, &oi
->address
->u
.prefix4
,
3033 buf
[2], sizeof(buf
[2])));
3035 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3036 /* Try to fix multicast membership.
3037 * Some OS:es may have problems in this area,
3038 * make sure it is removed.
3040 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3041 ospf_if_set_multicast(oi
);
3047 /* if no local ospf_interface,
3048 * or header area is backbone but ospf_interface is not
3049 * check for VLINK interface
3051 if ((oi
== NULL
) || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3052 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3053 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3055 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3057 "Packet from [%s] received on link %s"
3058 " but no ospf_interface",
3059 inet_ntoa(iph
->ip_src
), ifp
->name
);
3064 /* else it must be a local ospf interface, check it was received on
3067 else if (oi
->ifp
!= ifp
) {
3068 if (IS_DEBUG_OSPF_EVENT
)
3069 flog_warn(EC_OSPF_PACKET
,
3070 "Packet from [%s] received on wrong link %s",
3071 inet_ntoa(iph
->ip_src
), ifp
->name
);
3073 } else if (oi
->state
== ISM_Down
) {
3074 char buf
[2][INET_ADDRSTRLEN
];
3077 "Ignoring packet from %s to %s received on interface that is "
3078 "down [%s]; interface flags are %s",
3079 inet_ntop(AF_INET
, &iph
->ip_src
, buf
[0],
3081 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3083 ifp
->name
, if_flag_dump(ifp
->flags
));
3084 /* Fix multicast memberships? */
3085 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3086 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3087 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3088 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3089 if (oi
->multicast_memberships
)
3090 ospf_if_set_multicast(oi
);
3095 * If the received packet is destined for AllDRouters, the packet
3096 * should be accepted only if the received ospf interface state is
3097 * either DR or Backup -- endo.
3099 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3100 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3103 "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)",
3104 inet_ntoa(iph
->ip_src
), IF_NAME(oi
),
3105 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3106 /* Try to fix multicast membership. */
3107 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3108 ospf_if_set_multicast(oi
);
3112 /* Verify more OSPF header fields. */
3113 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3115 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3117 "ospf_read[%s]: Header check failed, "
3119 inet_ntoa(iph
->ip_src
));
3123 /* Show debug receiving packet. */
3124 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3125 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3127 "-----------------------------------------------------");
3128 ospf_packet_dump(ibuf
);
3131 zlog_debug("%s received from [%s] via [%s]",
3132 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3133 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
3134 zlog_debug(" src [%s],", inet_ntoa(iph
->ip_src
));
3135 zlog_debug(" dst [%s]", inet_ntoa(iph
->ip_dst
));
3137 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3139 "-----------------------------------------------------");
3142 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3144 /* Adjust size to message length. */
3145 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3147 /* Read rest of the packet and call each sort of packet routine. */
3148 switch (ospfh
->type
) {
3149 case OSPF_MSG_HELLO
:
3150 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3152 case OSPF_MSG_DB_DESC
:
3153 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3155 case OSPF_MSG_LS_REQ
:
3156 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3158 case OSPF_MSG_LS_UPD
:
3159 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3161 case OSPF_MSG_LS_ACK
:
3162 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3165 flog_warn(EC_OSPF_PACKET
,
3166 "interface %s: OSPF packet header type %d is illegal",
3167 IF_NAME(oi
), ospfh
->type
);
3174 /* Make OSPF header. */
3175 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3178 struct ospf_header
*ospfh
;
3180 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3182 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3183 ospfh
->type
= (uint8_t)type
;
3185 ospfh
->router_id
= oi
->ospf
->router_id
;
3187 ospfh
->checksum
= 0;
3188 ospfh
->area_id
= oi
->area
->area_id
;
3189 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3191 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3193 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3196 /* Make Authentication Data. */
3197 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3199 struct crypt_key
*ck
;
3201 switch (ospf_auth_type(oi
)) {
3202 case OSPF_AUTH_NULL
:
3203 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3206 case OSPF_AUTH_SIMPLE
:
3207 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3208 OSPF_AUTH_SIMPLE_SIZE
);
3210 case OSPF_AUTH_CRYPTOGRAPHIC
:
3211 /* If key is not set, then set 0. */
3212 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3213 ospfh
->u
.crypt
.zero
= 0;
3214 ospfh
->u
.crypt
.key_id
= 0;
3215 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3218 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3219 ospfh
->u
.crypt
.zero
= 0;
3220 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3221 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3223 /* note: the seq is done in ospf_make_md5_digest() */
3226 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3234 /* Fill rest of OSPF header. */
3235 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3238 struct ospf_header
*ospfh
;
3240 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3243 ospfh
->length
= htons(length
);
3245 /* Calculate checksum. */
3246 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3247 ospfh
->checksum
= in_cksum(ospfh
, length
);
3249 ospfh
->checksum
= 0;
3251 /* Add Authentication Data. */
3252 ospf_make_auth(oi
, ospfh
);
3255 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3257 struct ospf_neighbor
*nbr
;
3258 struct route_node
*rn
;
3259 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3260 struct in_addr mask
;
3264 /* Set netmask of interface. */
3265 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3266 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3267 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3268 masklen2ip(oi
->address
->prefixlen
, &mask
);
3270 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3271 stream_put_ipv4(s
, mask
.s_addr
);
3273 /* Set Hello Interval. */
3274 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3275 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3277 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3279 if (IS_DEBUG_OSPF_EVENT
)
3280 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3284 stream_putc(s
, OPTIONS(oi
));
3286 /* Set Router Priority. */
3287 stream_putc(s
, PRIORITY(oi
));
3289 /* Set Router Dead Interval. */
3290 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3292 /* Set Designated Router. */
3293 stream_put_ipv4(s
, DR(oi
).s_addr
);
3295 p
= stream_get_endp(s
);
3297 /* Set Backup Designated Router. */
3298 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3300 /* Add neighbor seen. */
3301 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3302 if ((nbr
= rn
->info
))
3303 if (nbr
->router_id
.s_addr
3304 != 0) /* Ignore 0.0.0.0 node. */
3306 != NSM_Attempt
) /* Ignore Down neighbor. */
3308 != NSM_Down
) /* This is myself for
3310 if (!IPV4_ADDR_SAME(
3312 &oi
->ospf
->router_id
)) {
3313 /* Check neighbor is
3315 if (nbr
->d_router
.s_addr
3329 /* Hello packet overflows interface MTU. */
3330 if (length
+ sizeof(uint32_t)
3331 > ospf_packet_max(oi
)) {
3333 EC_OSPF_LARGE_HELLO
,
3334 "Oversized Hello packet! Larger than MTU. Not sending it out");
3345 /* Let neighbor generate BackupSeen. */
3347 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3352 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3353 struct ospf_neighbor
*nbr
, struct stream
*s
)
3355 struct ospf_lsa
*lsa
;
3356 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3360 struct ospf_lsdb
*lsdb
;
3362 /* Set Interface MTU. */
3363 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3366 stream_putw(s
, oi
->ifp
->mtu
);
3369 options
= OPTIONS(oi
);
3370 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3371 SET_FLAG(options
, OSPF_OPTION_O
);
3372 stream_putc(s
, options
);
3375 pp
= stream_get_endp(s
);
3376 stream_putc(s
, nbr
->dd_flags
);
3378 /* Set DD Sequence Number. */
3379 stream_putl(s
, nbr
->dd_seqnum
);
3381 /* shortcut unneeded walk of (empty) summary LSDBs */
3382 if (ospf_db_summary_isempty(nbr
))
3385 /* Describe LSA Header from Database Summary List. */
3386 lsdb
= &nbr
->db_sum
;
3388 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3389 struct route_table
*table
= lsdb
->type
[i
].db
;
3390 struct route_node
*rn
;
3392 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3393 if ((lsa
= rn
->info
) != NULL
) {
3394 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3395 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3396 /* Suppress advertising
3397 * opaque-information. */
3398 /* Remove LSA from DB summary list. */
3399 ospf_lsdb_delete(lsdb
, lsa
);
3403 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3404 struct lsa_header
*lsah
;
3407 /* DD packet overflows interface MTU. */
3408 if (length
+ OSPF_LSA_HEADER_SIZE
3409 > ospf_packet_max(oi
))
3412 /* Keep pointer to LS age. */
3413 lsah
= (struct lsa_header
3418 /* Proceed stream pointer. */
3419 stream_put(s
, lsa
->data
,
3420 OSPF_LSA_HEADER_SIZE
);
3421 length
+= OSPF_LSA_HEADER_SIZE
;
3424 ls_age
= LS_AGE(lsa
);
3425 lsah
->ls_age
= htons(ls_age
);
3428 /* Remove LSA from DB summary list. */
3429 ospf_lsdb_delete(lsdb
, lsa
);
3433 /* Update 'More' bit */
3434 if (ospf_db_summary_isempty(nbr
)) {
3436 if (nbr
->state
>= NSM_Exchange
) {
3437 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3438 /* Rewrite DD flags */
3439 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3441 assert(IS_SET_DD_M(nbr
->dd_flags
));
3447 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3448 unsigned long delta
, struct ospf_neighbor
*nbr
,
3449 struct ospf_lsa
*lsa
)
3451 struct ospf_interface
*oi
;
3455 /* LS Request packet overflows interface MTU
3456 * delta is just number of bytes required for 1 LS Req
3457 * ospf_packet_max will return the number of bytes can
3458 * be accomodated without ospf header. So length+delta
3459 * can be compared to ospf_packet_max
3460 * to check if it can fit another lsreq in the same packet.
3463 if (*length
+ delta
> ospf_packet_max(oi
))
3466 stream_putl(s
, lsa
->data
->type
);
3467 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3468 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3470 ospf_lsa_unlock(&nbr
->ls_req_last
);
3471 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3477 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3479 struct ospf_lsa
*lsa
;
3480 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3481 unsigned long delta
= 12;
3482 struct route_table
*table
;
3483 struct route_node
*rn
;
3485 struct ospf_lsdb
*lsdb
;
3487 lsdb
= &nbr
->ls_req
;
3489 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3490 table
= lsdb
->type
[i
].db
;
3491 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3492 if ((lsa
= (rn
->info
)) != NULL
)
3493 if (ospf_make_ls_req_func(s
, &length
, delta
,
3496 route_unlock_node(rn
);
3503 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3507 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3509 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3512 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3515 struct ospf_lsa
*lsa
;
3516 struct listnode
*node
;
3517 uint16_t length
= 0;
3518 unsigned int size_noauth
;
3519 unsigned long delta
= stream_get_endp(s
);
3523 if (IS_DEBUG_OSPF_EVENT
)
3524 zlog_debug("ospf_make_ls_upd: Start");
3526 pp
= stream_get_endp(s
);
3527 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3528 length
+= OSPF_LS_UPD_MIN_SIZE
;
3530 /* Calculate amount of packet usable for data. */
3531 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3533 while ((node
= listhead(update
)) != NULL
) {
3534 struct lsa_header
*lsah
;
3537 if (IS_DEBUG_OSPF_EVENT
)
3538 zlog_debug("ospf_make_ls_upd: List Iteration %d",
3541 lsa
= listgetdata(node
);
3545 /* Will it fit? Minimum it has to fit atleast one */
3546 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3550 /* Keep pointer to LS age. */
3551 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3552 + stream_get_endp(s
));
3554 /* Put LSA to Link State Request. */
3555 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3558 /* each hop must increment an lsa_age by transmit_delay
3559 of OSPF interface */
3560 ls_age
= ls_age_increment(lsa
,
3561 OSPF_IF_PARAM(oi
, transmit_delay
));
3562 lsah
->ls_age
= htons(ls_age
);
3564 length
+= ntohs(lsa
->data
->length
);
3567 list_delete_node(update
, node
);
3568 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3571 /* Now set #LSAs. */
3572 stream_putl_at(s
, pp
, count
);
3574 if (IS_DEBUG_OSPF_EVENT
)
3575 zlog_debug("ospf_make_ls_upd: Stop");
3579 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3582 struct listnode
*node
, *nnode
;
3583 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3584 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3585 struct ospf_lsa
*lsa
;
3587 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3590 /* LS Ack packet overflows interface MTU
3591 * delta is just number of bytes required for
3592 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3593 * the number of bytes can be accomodated without
3594 * ospf header. So length+delta can be compared
3595 * against ospf_packet_max to check if it can fit
3596 * another ls header in the same packet.
3598 if ((length
+ delta
) > ospf_packet_max(oi
))
3601 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3602 length
+= OSPF_LSA_HEADER_SIZE
;
3604 listnode_delete(ack
, lsa
);
3605 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3611 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3613 struct ospf_packet
*op
;
3614 uint16_t length
= OSPF_HEADER_SIZE
;
3616 op
= ospf_packet_new(oi
->ifp
->mtu
);
3618 /* Prepare OSPF common header. */
3619 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3621 /* Prepare OSPF Hello body. */
3622 length
+= ospf_make_hello(oi
, op
->s
);
3623 if (length
== OSPF_HEADER_SIZE
) {
3624 /* Hello overshooting MTU */
3625 ospf_packet_free(op
);
3629 /* Fill OSPF header. */
3630 ospf_fill_header(oi
, op
->s
, length
);
3632 /* Set packet length. */
3633 op
->length
= length
;
3635 op
->dst
.s_addr
= addr
;
3637 if (IS_DEBUG_OSPF_EVENT
) {
3638 if (oi
->ospf
->vrf_id
)
3640 "%s: Hello Tx interface %s ospf vrf %s id %u",
3641 __PRETTY_FUNCTION__
, oi
->ifp
->name
,
3642 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3645 /* Add packet to the top of the interface output queue, so that they
3646 * can't get delayed by things like long queues of LS Update packets
3648 ospf_packet_add_top(oi
, op
);
3650 /* Hook thread to write packet. */
3651 OSPF_ISM_WRITE_ON(oi
->ospf
);
3654 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3656 struct ospf_interface
*oi
;
3661 /* If this is passive interface, do not send OSPF Hello. */
3662 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3665 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3668 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3671 if (PRIORITY(oi
) == 0)
3674 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3675 && oi
->state
!= ISM_Backup
)
3678 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3681 int ospf_poll_timer(struct thread
*thread
)
3683 struct ospf_nbr_nbma
*nbr_nbma
;
3685 nbr_nbma
= THREAD_ARG(thread
);
3686 nbr_nbma
->t_poll
= NULL
;
3688 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3689 zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)",
3690 IF_NAME(nbr_nbma
->oi
), inet_ntoa(nbr_nbma
->addr
));
3692 ospf_poll_send(nbr_nbma
);
3694 if (nbr_nbma
->v_poll
> 0)
3695 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3702 int ospf_hello_reply_timer(struct thread
*thread
)
3704 struct ospf_neighbor
*nbr
;
3706 nbr
= THREAD_ARG(thread
);
3707 nbr
->t_hello_reply
= NULL
;
3711 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3712 zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)",
3713 IF_NAME(nbr
->oi
), inet_ntoa(nbr
->router_id
));
3715 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3720 /* Send OSPF Hello. */
3721 void ospf_hello_send(struct ospf_interface
*oi
)
3723 /* If this is passive interface, do not send OSPF Hello. */
3724 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3727 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3728 struct ospf_neighbor
*nbr
;
3729 struct route_node
*rn
;
3731 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3732 if ((nbr
= rn
->info
))
3733 if (nbr
!= oi
->nbr_self
)
3734 if (nbr
->state
!= NSM_Down
) {
3735 /* RFC 2328 Section 9.5.1
3736 If the router is not
3737 eligible to become Designated
3739 it must periodically send
3740 Hello Packets to both the
3741 Designated Router and the
3742 Backup Designated Router (if
3745 if (PRIORITY(oi
) == 0
3756 /* If the router is eligible to
3757 become Designated Router, it
3758 must periodically send Hello
3759 Packets to all neighbors that
3760 are also eligible. In
3761 addition, if the router is
3763 Designated Router or Backup
3764 Designated Router, it must
3766 send periodic Hello Packets
3767 to all other neighbors. */
3769 if (nbr
->priority
== 0
3770 && oi
->state
== ISM_DROther
)
3772 /* if oi->state == Waiting, send
3773 * hello to all neighbors */
3774 ospf_hello_send_sub(
3776 nbr
->address
.u
.prefix4
3780 /* Decide destination address. */
3781 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3782 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3784 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3788 /* Send OSPF Database Description. */
3789 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3791 struct ospf_interface
*oi
;
3792 struct ospf_packet
*op
;
3793 uint16_t length
= OSPF_HEADER_SIZE
;
3796 op
= ospf_packet_new(oi
->ifp
->mtu
);
3798 /* Prepare OSPF common header. */
3799 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3801 /* Prepare OSPF Database Description body. */
3802 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3804 /* Fill OSPF header. */
3805 ospf_fill_header(oi
, op
->s
, length
);
3807 /* Set packet length. */
3808 op
->length
= length
;
3810 /* Decide destination address. */
3811 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3812 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3814 op
->dst
= nbr
->address
.u
.prefix4
;
3816 /* Add packet to the interface output queue. */
3817 ospf_packet_add(oi
, op
);
3819 /* Hook thread to write packet. */
3820 OSPF_ISM_WRITE_ON(oi
->ospf
);
3822 /* Remove old DD packet, then copy new one and keep in neighbor
3825 ospf_packet_free(nbr
->last_send
);
3826 nbr
->last_send
= ospf_packet_dup(op
);
3827 monotime(&nbr
->last_send_ts
);
3830 /* Re-send Database Description. */
3831 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3833 struct ospf_interface
*oi
;
3837 /* Add packet to the interface output queue. */
3838 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3840 /* Hook thread to write packet. */
3841 OSPF_ISM_WRITE_ON(oi
->ospf
);
3844 /* Send Link State Request. */
3845 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3847 struct ospf_interface
*oi
;
3848 struct ospf_packet
*op
;
3849 uint16_t length
= OSPF_HEADER_SIZE
;
3852 op
= ospf_packet_new(oi
->ifp
->mtu
);
3854 /* Prepare OSPF common header. */
3855 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3857 /* Prepare OSPF Link State Request body. */
3858 length
+= ospf_make_ls_req(nbr
, op
->s
);
3859 if (length
== OSPF_HEADER_SIZE
) {
3860 ospf_packet_free(op
);
3864 /* Fill OSPF header. */
3865 ospf_fill_header(oi
, op
->s
, length
);
3867 /* Set packet length. */
3868 op
->length
= length
;
3870 /* Decide destination address. */
3871 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3872 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3874 op
->dst
= nbr
->address
.u
.prefix4
;
3876 /* Add packet to the interface output queue. */
3877 ospf_packet_add(oi
, op
);
3879 /* Hook thread to write packet. */
3880 OSPF_ISM_WRITE_ON(oi
->ospf
);
3882 /* Add Link State Request Retransmission Timer. */
3883 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3886 /* Send Link State Update with an LSA. */
3887 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3890 struct list
*update
;
3892 update
= list_new();
3894 listnode_add(update
, lsa
);
3896 /*ospf instance is going down, send self originated
3897 * MAXAGE LSA update to neighbors to remove from LSDB */
3898 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3899 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3901 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3903 list_delete(&update
);
3906 /* Determine size for packet. Must be at least big enough to accomodate next
3907 * LSA on list, which may be bigger than MTU size.
3909 * Return pointer to new ospf_packet
3910 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3911 * on packet sizes (in which case offending LSA is deleted from update list)
3913 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3914 struct ospf_interface
*oi
)
3916 struct ospf_lsa
*lsa
;
3917 struct listnode
*ln
;
3919 static char warned
= 0;
3921 lsa
= listgetdata((ln
= listhead(update
)));
3924 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3925 > ospf_packet_max(oi
)) {
3929 "ospf_ls_upd_packet_new: oversized LSA encountered!"
3930 "will need to fragment. Not optimal. Try divide up"
3931 " your network with areas. Use 'debug ospf packet send'"
3932 " to see details, or look at 'show ip ospf database ..'");
3936 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3938 "ospf_ls_upd_packet_new: oversized LSA id:%s,"
3939 " %d bytes originated by %s, will be fragmented!",
3940 inet_ntoa(lsa
->data
->id
),
3941 ntohs(lsa
->data
->length
),
3942 inet_ntoa(lsa
->data
->adv_router
));
3945 * Allocate just enough to fit this LSA only, to avoid including
3947 * LSAs in fragmented LSA Updates.
3949 size
= ntohs(lsa
->data
->length
)
3950 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
3951 + OSPF_LS_UPD_MIN_SIZE
;
3953 size
= oi
->ifp
->mtu
;
3955 if (size
> OSPF_MAX_PACKET_SIZE
) {
3956 flog_warn(EC_OSPF_LARGE_LSA
,
3957 "ospf_ls_upd_packet_new: oversized LSA id:%s too big,"
3958 " %d bytes, packet size %ld, dropping it completely."
3959 " OSPF routing is broken!",
3960 inet_ntoa(lsa
->data
->id
), ntohs(lsa
->data
->length
),
3962 list_delete_node(update
, ln
);
3966 /* IP header is built up separately by ospf_write(). This means, that we
3968 * reduce the "affordable" size just calculated by length of an IP
3970 * This makes sure, that even if we manage to fill the payload with LSA
3972 * completely, the final packet (our data plus IP header) still fits
3974 * outgoing interface MTU. This correction isn't really meaningful for
3976 * oversized LSA, but for consistency the correction is done for both
3979 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
3981 return ospf_packet_new(size
- sizeof(struct ip
));
3984 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
3985 struct list
*update
, struct in_addr addr
,
3988 struct ospf_packet
*op
;
3989 uint16_t length
= OSPF_HEADER_SIZE
;
3991 if (IS_DEBUG_OSPF_EVENT
)
3992 zlog_debug("listcount = %d, [%s]dst %s", listcount(update
),
3993 IF_NAME(oi
), inet_ntoa(addr
));
3995 /* Check that we have really something to process */
3996 if (listcount(update
) == 0)
3999 op
= ospf_ls_upd_packet_new(update
, oi
);
4001 /* Prepare OSPF common header. */
4002 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4004 /* Prepare OSPF Link State Update body.
4005 * Includes Type-7 translation.
4007 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4009 /* Fill OSPF header. */
4010 ospf_fill_header(oi
, op
->s
, length
);
4012 /* Set packet length. */
4013 op
->length
= length
;
4015 /* Decide destination address. */
4016 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4017 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4019 op
->dst
.s_addr
= addr
.s_addr
;
4021 /* Add packet to the interface output queue. */
4022 ospf_packet_add(oi
, op
);
4023 /* Call ospf_write() right away to send ospf packets to neighbors */
4024 if (send_lsupd_now
) {
4025 struct thread os_packet_thd
;
4027 os_packet_thd
.arg
= (void *)oi
->ospf
;
4028 if (oi
->on_write_q
== 0) {
4029 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4032 ospf_write(&os_packet_thd
);
4034 * We are fake calling ospf_write with a fake
4035 * thread. Imagine that we have oi_a already
4036 * enqueued and we have turned on the write
4038 * Now this function calls this for oi_b
4039 * so the on_write_q has oi_a and oi_b on
4040 * it, ospf_write runs and clears the packets
4041 * for both oi_a and oi_b. Removing them from
4042 * the on_write_q. After this thread of execution
4043 * finishes we will execute the t_write thread
4044 * with nothing in the on_write_q causing an
4045 * assert. So just make sure that the t_write
4046 * is actually turned off.
4048 if (list_isempty(oi
->ospf
->oi_write_q
))
4049 OSPF_TIMER_OFF(oi
->ospf
->t_write
);
4051 /* Hook thread to write packet. */
4052 OSPF_ISM_WRITE_ON(oi
->ospf
);
4056 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
4058 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4059 struct route_node
*rn
;
4060 struct route_node
*rnext
;
4061 struct list
*update
;
4064 oi
->t_ls_upd_event
= NULL
;
4066 if (IS_DEBUG_OSPF_EVENT
)
4067 zlog_debug("ospf_ls_upd_send_queue start");
4069 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4070 rnext
= route_next(rn
);
4072 if (rn
->info
== NULL
)
4075 update
= (struct list
*)rn
->info
;
4077 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4079 /* list might not be empty. */
4080 if (listcount(update
) == 0) {
4081 list_delete((struct list
**)&rn
->info
);
4082 route_unlock_node(rn
);
4088 if (IS_DEBUG_OSPF_EVENT
)
4090 "ospf_ls_upd_send_queue: update lists not cleared,"
4091 " %d nodes to try again, raising new event",
4093 oi
->t_ls_upd_event
= NULL
;
4094 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4095 &oi
->t_ls_upd_event
);
4098 if (IS_DEBUG_OSPF_EVENT
)
4099 zlog_debug("ospf_ls_upd_send_queue stop");
4104 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4107 struct ospf_interface
*oi
;
4108 struct ospf_lsa
*lsa
;
4109 struct prefix_ipv4 p
;
4110 struct route_node
*rn
;
4111 struct listnode
*node
;
4116 p
.prefixlen
= IPV4_MAX_BITLEN
;
4118 /* Decide destination address. */
4119 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4120 p
.prefix
= oi
->vl_data
->peer_addr
;
4121 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4122 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4123 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4124 p
.prefix
= nbr
->address
.u
.prefix4
;
4125 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4126 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4127 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4128 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4130 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4132 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4133 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4136 "* LS-Update is directly sent on NBMA network.");
4137 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4138 flog_warn(EC_OSPF_PACKET
,
4139 "* LS-Update is sent to myself.");
4142 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4144 if (rn
->info
== NULL
)
4145 rn
->info
= list_new();
4147 route_unlock_node(rn
);
4149 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4150 listnode_add(rn
->info
,
4151 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4152 if (send_lsupd_now
) {
4153 struct list
*send_update_list
;
4154 struct route_node
*rnext
;
4156 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4157 rnext
= route_next(rn
);
4159 if (rn
->info
== NULL
)
4162 send_update_list
= (struct list
*)rn
->info
;
4164 ospf_ls_upd_queue_send(oi
, send_update_list
,
4165 rn
->p
.u
.prefix4
, 1);
4168 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4169 &oi
->t_ls_upd_event
);
4172 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4175 struct ospf_packet
*op
;
4176 uint16_t length
= OSPF_HEADER_SIZE
;
4178 op
= ospf_packet_new(oi
->ifp
->mtu
);
4180 /* Prepare OSPF common header. */
4181 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4183 /* Prepare OSPF Link State Acknowledgment body. */
4184 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4186 /* Fill OSPF header. */
4187 ospf_fill_header(oi
, op
->s
, length
);
4189 /* Set packet length. */
4190 op
->length
= length
;
4192 /* Decide destination address. */
4193 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4194 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4196 op
->dst
.s_addr
= dst
.s_addr
;
4198 /* Add packet to the interface output queue. */
4199 ospf_packet_add(oi
, op
);
4201 /* Hook thread to write packet. */
4202 OSPF_ISM_WRITE_ON(oi
->ospf
);
4205 static int ospf_ls_ack_send_event(struct thread
*thread
)
4207 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4209 oi
->t_ls_ack_direct
= NULL
;
4211 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4212 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4213 oi
->ls_ack_direct
.dst
);
4218 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4220 struct ospf_interface
*oi
= nbr
->oi
;
4222 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4223 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4225 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4227 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4228 &oi
->t_ls_ack_direct
);
4231 /* Send Link State Acknowledgment delayed. */
4232 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4236 /* Decide destination address. */
4237 /* RFC2328 Section 13.5 On non-broadcast
4238 networks, delayed Link State Acknowledgment packets must be
4239 unicast separately over each adjacency (i.e., neighbor whose
4240 state is >= Exchange). */
4241 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4242 struct ospf_neighbor
*nbr
;
4243 struct route_node
*rn
;
4245 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4246 if ((nbr
= rn
->info
) != NULL
)
4247 if (nbr
!= oi
->nbr_self
4248 && nbr
->state
>= NSM_Exchange
)
4249 while (listcount(oi
->ls_ack
))
4250 ospf_ls_ack_send_list(
4252 nbr
->address
.u
.prefix4
);
4255 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4256 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4257 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4258 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4259 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4260 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4261 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4262 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4264 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4266 while (listcount(oi
->ls_ack
))
4267 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4271 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4272 * address. As a result, the kernel does not need to learn the interface
4273 * MAC of the OSPF neighbor. However, in our world, this will delay
4274 * convergence. Take the case when due to a link flap, all routes now
4275 * want to use an interface which was deemed to be costlier prior to this
4276 * event. For routes that will be installed, the missing MAC will have
4277 * punt-to-CPU set on them. This may overload the CPU control path that
4278 * can be avoided if the MAC was known apriori.
4280 #define OSPF_PING_NBR_STR_MAX (BUFSIZ)
4281 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4283 char ping_nbr
[OSPF_PING_NBR_STR_MAX
];
4286 if (!nbr
|| !nbr
->oi
|| !nbr
->oi
->ifp
)
4289 snprintf(ping_nbr
, sizeof(ping_nbr
),
4290 "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr
->oi
->ifp
->name
,
4291 inet_ntoa(nbr
->address
.u
.prefix4
));
4293 ret
= system(ping_nbr
);
4294 if (IS_DEBUG_OSPF_EVENT
)
4295 zlog_debug("Executed %s %s", ping_nbr
,
4296 ((ret
== 0) ? "successfully" : "but failed"));