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"
56 #include "ospfd/ospf_zebra.h"
57 #include "ospfd/ospf_gr_helper.h"
60 * OSPF Fragmentation / fragmented writes
62 * ospfd can support writing fragmented packets, for cases where
63 * kernel will not fragment IP_HDRINCL and/or multicast destined
64 * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However,
65 * SunOS, probably BSD too, clobber the user supplied IP ID and IP
66 * flags fields, hence user-space fragmentation will not work.
67 * Only Linux is known to leave IP header unmolested.
68 * Further, fragmentation really should be done the kernel, which already
69 * supports it, and which avoids nasty IP ID state problems.
71 * Fragmentation of OSPF packets can be required on networks with router
72 * with many many interfaces active in one area, or on networks with links
76 #define WANT_OSPF_WRITE_FRAGMENT
79 /* Packet Type String. */
80 const struct message ospf_packet_type_str
[] = {
81 {OSPF_MSG_HELLO
, "Hello"},
82 {OSPF_MSG_DB_DESC
, "Database Description"},
83 {OSPF_MSG_LS_REQ
, "Link State Request"},
84 {OSPF_MSG_LS_UPD
, "Link State Update"},
85 {OSPF_MSG_LS_ACK
, "Link State Acknowledgment"},
88 /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of
89 particular types, offset is the "type" field of a packet. */
90 static const uint16_t ospf_packet_minlen
[] = {
93 OSPF_DB_DESC_MIN_SIZE
,
99 /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular
100 types, offset is the "LSA type" field. */
101 static const uint16_t ospf_lsa_minlen
[] = {
103 OSPF_ROUTER_LSA_MIN_SIZE
,
104 OSPF_NETWORK_LSA_MIN_SIZE
,
105 OSPF_SUMMARY_LSA_MIN_SIZE
,
106 OSPF_SUMMARY_LSA_MIN_SIZE
,
107 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
109 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
116 /* for ospf_check_auth() */
117 static int ospf_check_sum(struct ospf_header
*);
119 /* OSPF authentication checking function */
120 static int ospf_auth_type(struct ospf_interface
*oi
)
124 if (OSPF_IF_PARAM(oi
, auth_type
) == OSPF_AUTH_NOTSET
)
125 auth_type
= oi
->area
->auth_type
;
127 auth_type
= OSPF_IF_PARAM(oi
, auth_type
);
129 /* Handle case where MD5 key list is not configured aka Cisco */
130 if (auth_type
== OSPF_AUTH_CRYPTOGRAPHIC
131 && list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
132 return OSPF_AUTH_NULL
;
137 static struct ospf_packet
*ospf_packet_new(size_t size
)
139 struct ospf_packet
*new;
141 new = XCALLOC(MTYPE_OSPF_PACKET
, sizeof(struct ospf_packet
));
142 new->s
= stream_new(size
);
147 void ospf_packet_free(struct ospf_packet
*op
)
152 XFREE(MTYPE_OSPF_PACKET
, op
);
155 struct ospf_fifo
*ospf_fifo_new(void)
157 struct ospf_fifo
*new;
159 new = XCALLOC(MTYPE_OSPF_FIFO
, sizeof(struct ospf_fifo
));
163 /* Add new packet to fifo. */
164 void ospf_fifo_push(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
167 fifo
->tail
->next
= op
;
176 /* Add new packet to head of fifo. */
177 static void ospf_fifo_push_head(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
179 op
->next
= fifo
->head
;
181 if (fifo
->tail
== NULL
)
189 /* Delete first packet from fifo. */
190 struct ospf_packet
*ospf_fifo_pop(struct ospf_fifo
*fifo
)
192 struct ospf_packet
*op
;
197 fifo
->head
= op
->next
;
199 if (fifo
->head
== NULL
)
208 /* Return first fifo entry. */
209 struct ospf_packet
*ospf_fifo_head(struct ospf_fifo
*fifo
)
214 /* Flush ospf packet fifo. */
215 void ospf_fifo_flush(struct ospf_fifo
*fifo
)
217 struct ospf_packet
*op
;
218 struct ospf_packet
*next
;
220 for (op
= fifo
->head
; op
; op
= next
) {
222 ospf_packet_free(op
);
224 fifo
->head
= fifo
->tail
= NULL
;
228 /* Free ospf packet fifo. */
229 void ospf_fifo_free(struct ospf_fifo
*fifo
)
231 ospf_fifo_flush(fifo
);
233 XFREE(MTYPE_OSPF_FIFO
, fifo
);
236 static void ospf_packet_add(struct ospf_interface
*oi
, struct ospf_packet
*op
)
238 /* Add packet to end of queue. */
239 ospf_fifo_push(oi
->obuf
, op
);
241 /* Debug of packet fifo*/
242 /* ospf_fifo_debug (oi->obuf); */
245 static void ospf_packet_add_top(struct ospf_interface
*oi
,
246 struct ospf_packet
*op
)
248 /* Add packet to head of queue. */
249 ospf_fifo_push_head(oi
->obuf
, op
);
251 /* Debug of packet fifo*/
252 /* ospf_fifo_debug (oi->obuf); */
255 static void ospf_packet_delete(struct ospf_interface
*oi
)
257 struct ospf_packet
*op
;
259 op
= ospf_fifo_pop(oi
->obuf
);
262 ospf_packet_free(op
);
265 static struct ospf_packet
*ospf_packet_dup(struct ospf_packet
*op
)
267 struct ospf_packet
*new;
269 if (stream_get_endp(op
->s
) != op
->length
)
272 "ospf_packet_dup stream %lu ospf_packet %u size mismatch",
273 (unsigned long)STREAM_SIZE(op
->s
), op
->length
);
275 /* Reserve space for MD5 authentication that may be added later. */
276 new = ospf_packet_new(stream_get_endp(op
->s
) + OSPF_AUTH_MD5_SIZE
);
277 stream_copy(new->s
, op
->s
);
280 new->length
= op
->length
;
286 static unsigned int ospf_packet_authspace(struct ospf_interface
*oi
)
290 if (ospf_auth_type(oi
) == OSPF_AUTH_CRYPTOGRAPHIC
)
291 auth
= OSPF_AUTH_MD5_SIZE
;
296 static unsigned int ospf_packet_max(struct ospf_interface
*oi
)
300 max
= oi
->ifp
->mtu
- ospf_packet_authspace(oi
);
302 max
-= (OSPF_HEADER_SIZE
+ sizeof(struct ip
));
308 static int ospf_check_md5_digest(struct ospf_interface
*oi
,
309 struct ospf_header
*ospfh
)
311 #ifdef CRYPTO_OPENSSL
313 #elif CRYPTO_INTERNAL
316 unsigned char digest
[OSPF_AUTH_MD5_SIZE
];
317 struct crypt_key
*ck
;
318 struct ospf_neighbor
*nbr
;
319 uint16_t length
= ntohs(ospfh
->length
);
321 /* Get secret key. */
322 ck
= ospf_crypt_key_lookup(OSPF_IF_PARAM(oi
, auth_crypt
),
323 ospfh
->u
.crypt
.key_id
);
325 flog_warn(EC_OSPF_MD5
, "interface %s: ospf_check_md5 no key %d",
326 IF_NAME(oi
), ospfh
->u
.crypt
.key_id
);
330 /* check crypto seqnum. */
331 nbr
= ospf_nbr_lookup_by_routerid(oi
->nbrs
, &ospfh
->router_id
);
334 && ntohl(nbr
->crypt_seqnum
) > ntohl(ospfh
->u
.crypt
.crypt_seqnum
)) {
337 "interface %s: ospf_check_md5 bad sequence %d (expect %d)",
338 IF_NAME(oi
), ntohl(ospfh
->u
.crypt
.crypt_seqnum
),
339 ntohl(nbr
->crypt_seqnum
));
343 /* Generate a digest for the ospf packet - their digest + our digest. */
344 #ifdef CRYPTO_OPENSSL
345 unsigned int md5_size
= OSPF_AUTH_MD5_SIZE
;
346 ctx
= EVP_MD_CTX_new();
347 EVP_DigestInit(ctx
, EVP_md5());
348 EVP_DigestUpdate(ctx
, ospfh
, length
);
349 EVP_DigestUpdate(ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
350 EVP_DigestFinal(ctx
, digest
, &md5_size
);
351 EVP_MD_CTX_free(ctx
);
352 #elif CRYPTO_INTERNAL
353 memset(&ctx
, 0, sizeof(ctx
));
355 MD5Update(&ctx
, ospfh
, length
);
356 MD5Update(&ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
357 MD5Final(digest
, &ctx
);
360 /* compare the two */
361 if (memcmp((caddr_t
)ospfh
+ length
, digest
, OSPF_AUTH_MD5_SIZE
)) {
362 flog_warn(EC_OSPF_MD5
,
363 "interface %s: ospf_check_md5 checksum mismatch",
368 /* save neighbor's crypt_seqnum */
370 nbr
->crypt_seqnum
= ospfh
->u
.crypt
.crypt_seqnum
;
374 /* This function is called from ospf_write(), it will detect the
375 authentication scheme and if it is MD5, it will change the sequence
376 and update the MD5 digest. */
377 static int ospf_make_md5_digest(struct ospf_interface
*oi
,
378 struct ospf_packet
*op
)
380 struct ospf_header
*ospfh
;
381 unsigned char digest
[OSPF_AUTH_MD5_SIZE
] = {0};
382 #ifdef CRYPTO_OPENSSL
384 #elif CRYPTO_INTERNAL
389 struct crypt_key
*ck
;
390 const uint8_t *auth_key
;
392 ibuf
= STREAM_DATA(op
->s
);
393 ospfh
= (struct ospf_header
*)ibuf
;
395 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
398 /* We do this here so when we dup a packet, we don't have to
399 waste CPU rewriting other headers.
401 Note that quagga_time /deliberately/ is not used here */
402 t
= (time(NULL
) & 0xFFFFFFFF);
403 if (t
> oi
->crypt_seqnum
)
404 oi
->crypt_seqnum
= t
;
408 ospfh
->u
.crypt
.crypt_seqnum
= htonl(oi
->crypt_seqnum
);
410 /* Get MD5 Authentication key from auth_key list. */
411 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
412 auth_key
= (const uint8_t *)digest
;
414 ck
= listgetdata(listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
415 auth_key
= ck
->auth_key
;
418 /* Generate a digest for the entire packet + our secret key. */
419 #ifdef CRYPTO_OPENSSL
420 unsigned int md5_size
= OSPF_AUTH_MD5_SIZE
;
421 ctx
= EVP_MD_CTX_new();
422 EVP_DigestInit(ctx
, EVP_md5());
423 EVP_DigestUpdate(ctx
, ibuf
, ntohs(ospfh
->length
));
424 EVP_DigestUpdate(ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
425 EVP_DigestFinal(ctx
, digest
, &md5_size
);
426 EVP_MD_CTX_free(ctx
);
427 #elif CRYPTO_INTERNAL
428 memset(&ctx
, 0, sizeof(ctx
));
430 MD5Update(&ctx
, ibuf
, ntohs(ospfh
->length
));
431 MD5Update(&ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
432 MD5Final(digest
, &ctx
);
435 /* Append md5 digest to the end of the stream. */
436 stream_put(op
->s
, digest
, OSPF_AUTH_MD5_SIZE
);
438 /* We do *NOT* increment the OSPF header length. */
439 op
->length
= ntohs(ospfh
->length
) + OSPF_AUTH_MD5_SIZE
;
441 if (stream_get_endp(op
->s
) != op
->length
)
445 "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u",
446 (unsigned long)stream_get_endp(op
->s
), op
->length
);
448 return OSPF_AUTH_MD5_SIZE
;
452 static int ospf_ls_req_timer(struct thread
*thread
)
454 struct ospf_neighbor
*nbr
;
456 nbr
= THREAD_ARG(thread
);
457 nbr
->t_ls_req
= NULL
;
459 /* Send Link State Request. */
460 if (ospf_ls_request_count(nbr
))
461 ospf_ls_req_send(nbr
);
463 /* Set Link State Request retransmission timer. */
464 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
469 void ospf_ls_req_event(struct ospf_neighbor
*nbr
)
471 thread_cancel(&nbr
->t_ls_req
);
472 thread_add_event(master
, ospf_ls_req_timer
, nbr
, 0, &nbr
->t_ls_req
);
475 /* Cyclic timer function. Fist registered in ospf_nbr_new () in
477 int ospf_ls_upd_timer(struct thread
*thread
)
479 struct ospf_neighbor
*nbr
;
481 nbr
= THREAD_ARG(thread
);
482 nbr
->t_ls_upd
= NULL
;
484 /* Send Link State Update. */
485 if (ospf_ls_retransmit_count(nbr
) > 0) {
487 struct ospf_lsdb
*lsdb
;
489 int retransmit_interval
;
491 retransmit_interval
=
492 OSPF_IF_PARAM(nbr
->oi
, retransmit_interval
);
494 lsdb
= &nbr
->ls_rxmt
;
497 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
498 struct route_table
*table
= lsdb
->type
[i
].db
;
499 struct route_node
*rn
;
501 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
502 struct ospf_lsa
*lsa
;
504 if ((lsa
= rn
->info
) != NULL
) {
505 /* Don't retransmit an LSA if we
507 the last RxmtInterval seconds - this
509 neighbour a chance to acknowledge the
511 have ben just received before the
513 fired. This is a small tweak to what
515 but it will cut out out a lot of
518 if (monotime_since(&lsa
->tv_recv
, NULL
)
519 >= retransmit_interval
* 1000000LL)
520 listnode_add(update
, rn
->info
);
525 if (listcount(update
) > 0)
526 ospf_ls_upd_send(nbr
, update
, OSPF_SEND_PACKET_DIRECT
,
528 list_delete(&update
);
531 /* Set LS Update retransmission timer. */
532 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
, nbr
->v_ls_upd
);
537 int ospf_ls_ack_timer(struct thread
*thread
)
539 struct ospf_interface
*oi
;
541 oi
= THREAD_ARG(thread
);
544 /* Send Link State Acknowledgment. */
545 if (listcount(oi
->ls_ack
) > 0)
546 ospf_ls_ack_send_delayed(oi
);
548 /* Set LS Ack timer. */
549 OSPF_ISM_TIMER_ON(oi
->t_ls_ack
, ospf_ls_ack_timer
, oi
->v_ls_ack
);
554 #ifdef WANT_OSPF_WRITE_FRAGMENT
555 static void ospf_write_frags(int fd
, struct ospf_packet
*op
, struct ip
*iph
,
556 struct msghdr
*msg
, unsigned int maxdatasize
,
557 unsigned int mtu
, int flags
, uint8_t type
)
559 #define OSPF_WRITE_FRAG_SHIFT 3
564 assert(op
->length
== stream_get_endp(op
->s
));
565 assert(msg
->msg_iovlen
== 2);
569 * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
570 * well as the IP_MF flag, making this all quite pointless.
572 * However, for a system on which IP_MF is left alone, and ip_id left
573 * alone or else which sets same ip_id for each fragment this might
576 * XXX-TODO: It would be much nicer to have the kernel's use their
577 * existing fragmentation support to do this for us. Bugs/RFEs need to
578 * be raised against the various kernels.
582 iph
->ip_off
|= IP_MF
;
584 /* ip frag offset is expressed in units of 8byte words */
585 offset
= maxdatasize
>> OSPF_WRITE_FRAG_SHIFT
;
587 iovp
= &msg
->msg_iov
[1];
589 while ((stream_get_endp(op
->s
) - stream_get_getp(op
->s
))
591 /* data length of this frag is to next offset value */
592 iovp
->iov_len
= offset
<< OSPF_WRITE_FRAG_SHIFT
;
593 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
594 assert(iph
->ip_len
<= mtu
);
596 sockopt_iphdrincl_swab_htosys(iph
);
598 ret
= sendmsg(fd
, msg
, flags
);
600 sockopt_iphdrincl_swab_systoh(iph
);
605 "*** ospf_write_frags: sendmsg failed to %pI4, id %d, off %d, len %d, mtu %u failed with %s",
606 &iph
->ip_dst
, iph
->ip_id
, iph
->ip_off
,
607 iph
->ip_len
, mtu
, safe_strerror(errno
));
609 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
611 "ospf_write_frags: sent id %d, off %d, len %d to %pI4",
612 iph
->ip_id
, iph
->ip_off
, iph
->ip_len
,
616 iph
->ip_off
+= offset
;
617 stream_forward_getp(op
->s
, iovp
->iov_len
);
618 iovp
->iov_base
= stream_pnt(op
->s
);
621 /* setup for final fragment */
622 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
623 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
624 iph
->ip_off
&= (~IP_MF
);
626 #endif /* WANT_OSPF_WRITE_FRAGMENT */
628 static int ospf_write(struct thread
*thread
)
630 struct ospf
*ospf
= THREAD_ARG(thread
);
631 struct ospf_interface
*oi
;
632 struct ospf_interface
*last_serviced_oi
= NULL
;
633 struct ospf_packet
*op
;
634 struct sockaddr_in sa_dst
;
641 struct listnode
*node
;
642 #ifdef WANT_OSPF_WRITE_FRAGMENT
643 static uint16_t ipid
= 0;
644 uint16_t maxdatasize
;
645 #endif /* WANT_OSPF_WRITE_FRAGMENT */
646 #define OSPF_WRITE_IPHL_SHIFT 2
650 unsigned char cmsgbuf
[64] = {};
651 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
652 struct in_pktinfo
*pi
;
655 if (ospf
->fd
< 0 || ospf
->oi_running
== 0) {
656 if (IS_DEBUG_OSPF_EVENT
)
658 "ospf_write failed to send, fd %d, instance %u",
659 ospf
->fd
, ospf
->oi_running
);
663 node
= listhead(ospf
->oi_write_q
);
665 oi
= listgetdata(node
);
667 #ifdef WANT_OSPF_WRITE_FRAGMENT
668 /* seed ipid static with low order bits of time */
670 ipid
= (time(NULL
) & 0xffff);
671 #endif /* WANT_OSPF_WRITE_FRAGMENT */
673 while ((pkt_count
< ospf
->write_oi_count
) && oi
674 && (last_serviced_oi
!= oi
)) {
675 /* If there is only packet in the queue, the oi is removed from
676 write-q, so fix up the last interface that was serviced */
677 if (last_serviced_oi
== NULL
) {
678 last_serviced_oi
= oi
;
681 #ifdef WANT_OSPF_WRITE_FRAGMENT
682 /* convenience - max OSPF data per packet */
683 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
684 #endif /* WANT_OSPF_WRITE_FRAGMENT */
685 /* Get one packet from queue. */
686 op
= ospf_fifo_head(oi
->obuf
);
688 assert(op
->length
>= OSPF_HEADER_SIZE
);
690 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
691 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
692 ospf_if_ipmulticast(ospf
, oi
->address
,
695 /* Rewrite the md5 signature & update the seq */
696 ospf_make_md5_digest(oi
, op
);
698 /* Retrieve OSPF packet type. */
699 stream_set_getp(op
->s
, 1);
700 type
= stream_getc(op
->s
);
702 /* reset get pointer */
703 stream_set_getp(op
->s
, 0);
705 memset(&iph
, 0, sizeof(struct ip
));
706 memset(&sa_dst
, 0, sizeof(sa_dst
));
708 sa_dst
.sin_family
= AF_INET
;
709 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
710 sa_dst
.sin_len
= sizeof(sa_dst
);
711 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
712 sa_dst
.sin_addr
= op
->dst
;
713 sa_dst
.sin_port
= htons(0);
715 /* Set DONTROUTE flag if dst is unicast. */
716 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
717 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
718 flags
= MSG_DONTROUTE
;
720 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
721 /* it'd be very strange for header to not be 4byte-word aligned
723 if (sizeof(struct ip
)
724 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
725 iph
.ip_hl
++; /* we presume sizeof(struct ip) cant
728 iph
.ip_v
= IPVERSION
;
729 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
730 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
732 #if defined(__DragonFly__)
734 * DragonFly's raw socket expects ip_len/ip_off in network byte
737 iph
.ip_len
= htons(iph
.ip_len
);
740 #ifdef WANT_OSPF_WRITE_FRAGMENT
741 /* XXX-MT: not thread-safe at all..
742 * XXX: this presumes this is only programme sending OSPF
744 * otherwise, no guarantee ipid will be unique
747 #endif /* WANT_OSPF_WRITE_FRAGMENT */
750 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
751 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
753 iph
.ip_ttl
= OSPF_IP_TTL
;
754 iph
.ip_p
= IPPROTO_OSPFIGP
;
756 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
757 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
759 memset(&msg
, 0, sizeof(msg
));
760 msg
.msg_name
= (caddr_t
)&sa_dst
;
761 msg
.msg_namelen
= sizeof(sa_dst
);
765 iov
[0].iov_base
= (char *)&iph
;
766 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
767 iov
[1].iov_base
= stream_pnt(op
->s
);
768 iov
[1].iov_len
= op
->length
;
771 msg
.msg_control
= (caddr_t
)cm
;
772 cm
->cmsg_level
= SOL_IP
;
773 cm
->cmsg_type
= IP_PKTINFO
;
774 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
775 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
776 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
778 msg
.msg_controllen
= cm
->cmsg_len
;
781 /* Sadly we can not rely on kernels to fragment packets
782 * because of either IP_HDRINCL and/or multicast
783 * destination being set.
786 #ifdef WANT_OSPF_WRITE_FRAGMENT
787 if (op
->length
> maxdatasize
)
788 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
789 oi
->ifp
->mtu
, flags
, type
);
790 #endif /* WANT_OSPF_WRITE_FRAGMENT */
792 /* send final fragment (could be first) */
793 sockopt_iphdrincl_swab_htosys(&iph
);
794 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
795 sockopt_iphdrincl_swab_systoh(&iph
);
796 if (IS_DEBUG_OSPF_EVENT
)
798 "ospf_write to %pI4, id %d, off %d, len %d, interface %s, mtu %u:",
799 &iph
.ip_dst
, iph
.ip_id
, iph
.ip_off
,
800 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
802 /* sendmsg will return EPERM if firewall is blocking sending.
803 * This is a normal situation when 'ip nhrp map multicast xxx'
804 * is being used to send multicast packets to DMVPN peers. In
805 * that case the original message is blocked with iptables rule
806 * causing the EPERM result
808 if (ret
< 0 && errno
!= EPERM
)
811 "*** sendmsg in ospf_write failed to %pI4, id %d, off %d, len %d, interface %s, mtu %u: %s",
812 &iph
.ip_dst
, iph
.ip_id
, iph
.ip_off
,
813 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
814 safe_strerror(errno
));
816 /* Show debug sending packet. */
817 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
818 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
820 "-----------------------------------------------------");
821 stream_set_getp(op
->s
, 0);
822 ospf_packet_dump(op
->s
);
825 zlog_debug("%s sent to [%pI4] via [%s].",
826 lookup_msg(ospf_packet_type_str
, type
, NULL
),
827 &op
->dst
, IF_NAME(oi
));
829 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
831 "-----------------------------------------------------");
838 case OSPF_MSG_DB_DESC
:
841 case OSPF_MSG_LS_REQ
:
844 case OSPF_MSG_LS_UPD
:
847 case OSPF_MSG_LS_ACK
:
854 /* Now delete packet from queue. */
855 ospf_packet_delete(oi
);
857 /* Move this interface to the tail of write_q to
858 serve everyone in a round robin fashion */
859 list_delete_node(ospf
->oi_write_q
, node
);
860 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
862 last_serviced_oi
= NULL
;
865 listnode_add(ospf
->oi_write_q
, oi
);
868 /* Setup to service from the head of the queue again */
869 if (!list_isempty(ospf
->oi_write_q
)) {
870 node
= listhead(ospf
->oi_write_q
);
871 oi
= listgetdata(node
);
875 /* If packets still remain in queue, call write thread. */
876 if (!list_isempty(ospf
->oi_write_q
))
877 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
883 /* OSPF Hello message read -- RFC2328 Section 10.5. */
884 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
885 struct stream
*s
, struct ospf_interface
*oi
, int size
)
887 struct ospf_hello
*hello
;
888 struct ospf_neighbor
*nbr
;
892 /* increment statistics. */
895 hello
= (struct ospf_hello
*)stream_pnt(s
);
897 /* If Hello is myself, silently discard. */
898 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
899 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
901 "ospf_header[%s/%pI4]: selforiginated, dropping.",
902 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
909 /* get neighbor prefix. */
911 p
.prefixlen
= ip_masklen(hello
->network_mask
);
912 p
.u
.prefix4
= iph
->ip_src
;
914 /* Compare network mask. */
915 /* Checking is ignored for Point-to-Point and Virtual link. */
916 /* Checking is also ignored for Point-to-Multipoint with /32 prefix */
917 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
918 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
919 && !(oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
920 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
))
921 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
924 "Packet %pI4 [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
925 &ospfh
->router_id
, IF_NAME(oi
),
926 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
930 /* Compare Router Dead Interval. */
931 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
932 flog_warn(EC_OSPF_PACKET
,
933 "Packet %pI4 [Hello:RECV]: RouterDeadInterval mismatch (expected %u, but received %u).",
935 OSPF_IF_PARAM(oi
, v_wait
),
936 ntohl(hello
->dead_interval
));
940 /* Compare Hello Interval - ignored if fast-hellos are set. */
941 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
942 if (OSPF_IF_PARAM(oi
, v_hello
)
943 != ntohs(hello
->hello_interval
)) {
946 "Packet %pI4 [Hello:RECV]: HelloInterval mismatch (expected %u, but received %u).",
948 OSPF_IF_PARAM(oi
, v_hello
),
949 ntohs(hello
->hello_interval
));
954 if (IS_DEBUG_OSPF_EVENT
)
955 zlog_debug("Packet %pI4 [Hello:RECV]: Options %s vrf %s",
957 ospf_options_dump(hello
->options
),
958 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
960 /* Compare options. */
961 #define REJECT_IF_TBIT_ON 1 /* XXX */
962 #ifdef REJECT_IF_TBIT_ON
963 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
965 * This router does not support non-zero TOS.
966 * Drop this Hello packet not to establish neighbor
969 flog_warn(EC_OSPF_PACKET
,
970 "Packet %pI4 [Hello:RECV]: T-bit on, drop it.",
974 #endif /* REJECT_IF_TBIT_ON */
976 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
977 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
979 * This router does know the correct usage of O-bit
980 * the bit should be set in DD packet only.
982 flog_warn(EC_OSPF_PACKET
,
983 "Packet %pI4 [Hello:RECV]: O-bit abuse?",
985 #ifdef STRICT_OBIT_USAGE_CHECK
986 return; /* Reject this packet. */
987 #else /* STRICT_OBIT_USAGE_CHECK */
988 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
989 #endif /* STRICT_OBIT_USAGE_CHECK */
992 /* new for NSSA is to ensure that NP is on and E is off */
994 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
995 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
996 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
997 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
998 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
1001 "NSSA-Packet-%pI4[Hello:RECV]: my options: %x, his options %x",
1002 &ospfh
->router_id
, OPTIONS(oi
),
1006 if (IS_DEBUG_OSPF_NSSA
)
1007 zlog_debug("NSSA-Hello:RECV:Packet from %pI4:",
1010 /* The setting of the E-bit found in the Hello Packet's Options
1011 field must match this area's ExternalRoutingCapability A
1012 mismatch causes processing to stop and the packet to be
1013 dropped. The setting of the rest of the bits in the Hello
1014 Packet's Options field should be ignored. */
1015 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1016 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1019 "Packet %pI4 [Hello:RECV]: my options: %x, his options %x",
1020 &ospfh
->router_id
, OPTIONS(oi
),
1025 /* get neighbour struct */
1026 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1028 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1031 old_state
= nbr
->state
;
1033 /* Add event to thread. */
1034 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1036 /* RFC2328 Section 9.5.1
1037 If the router is not eligible to become Designated Router,
1038 (snip) It must also send an Hello Packet in reply to an
1039 Hello Packet received from any eligible neighbor (other than
1040 the current Designated Router and Backup Designated Router). */
1041 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1042 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1043 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1044 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1045 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1046 ospf_hello_reply_timer
,
1047 OSPF_HELLO_REPLY_DELAY
);
1049 /* on NBMA network type, it happens to receive bidirectional Hello
1051 without advance 1-Way Received event.
1052 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1053 if (oi
->type
== OSPF_IFTYPE_NBMA
1054 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1055 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1056 nbr
->priority
= hello
->priority
;
1057 nbr
->d_router
= hello
->d_router
;
1058 nbr
->bd_router
= hello
->bd_router
;
1062 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1063 size
- OSPF_HELLO_MIN_SIZE
)) {
1064 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1065 nbr
->options
|= hello
->options
;
1067 /* If the router is DR_OTHER, RESTARTER will not wait
1068 * until it receives the hello from it if it receives
1070 * So, helper might receives ONW_WAY hello from
1071 * RESTARTER. So not allowing to change the state if it
1072 * receives one_way hellow when it acts as HELPER for
1073 * that specific neighbor.
1075 if (!OSPF_GR_IS_ACTIVE_HELPER(nbr
))
1076 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1077 /* Set neighbor information. */
1078 nbr
->priority
= hello
->priority
;
1079 nbr
->d_router
= hello
->d_router
;
1080 nbr
->bd_router
= hello
->bd_router
;
1084 /* If neighbor itself declares DR and no BDR exists,
1085 cause event BackupSeen */
1086 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1087 if (hello
->bd_router
.s_addr
== INADDR_ANY
1088 && oi
->state
== ISM_Waiting
)
1089 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1091 /* neighbor itself declares BDR. */
1092 if (oi
->state
== ISM_Waiting
1093 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
))
1094 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1096 /* had not previously. */
1097 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1098 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1099 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1100 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->d_router
)))
1101 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1103 /* had not previously. */
1104 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1105 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1106 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1107 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
)))
1108 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1110 /* Neighbor priority check. */
1111 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1112 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1114 /* Set neighbor information. */
1115 nbr
->priority
= hello
->priority
;
1116 nbr
->d_router
= hello
->d_router
;
1117 nbr
->bd_router
= hello
->bd_router
;
1120 /* Save DD flags/options/Seqnum received. */
1121 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1122 struct ospf_db_desc
*dd
)
1124 nbr
->last_recv
.flags
= dd
->flags
;
1125 nbr
->last_recv
.options
= dd
->options
;
1126 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1129 /* Process rest of DD packet. */
1130 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1131 struct ospf_neighbor
*nbr
,
1132 struct ospf_db_desc
*dd
, uint16_t size
)
1134 struct ospf_lsa
*new, *find
;
1135 struct lsa_header
*lsah
;
1137 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1138 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1139 size
-= OSPF_LSA_HEADER_SIZE
) {
1140 lsah
= (struct lsa_header
*)stream_pnt(s
);
1141 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1143 /* Unknown LS type. */
1144 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1145 flog_warn(EC_OSPF_PACKET
,
1146 "Packet [DD:RECV]: Unknown LS type %d.",
1148 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1152 if (IS_OPAQUE_LSA(lsah
->type
)
1153 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1154 flog_warn(EC_OSPF_PACKET
,
1155 "LSA[Type%d:%pI4]: Opaque capability mismatch?",
1156 lsah
->type
, &lsah
->id
);
1157 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1161 switch (lsah
->type
) {
1162 case OSPF_AS_EXTERNAL_LSA
:
1163 case OSPF_OPAQUE_AS_LSA
:
1164 /* Check for stub area. Reject if AS-External from stub
1166 allow if from NSSA. */
1167 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1170 "Packet [DD:RECV]: LSA[Type%d:%pI4] from %s area.",
1171 lsah
->type
, &lsah
->id
,
1172 (oi
->area
->external_routing
1176 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1177 NSM_SeqNumberMismatch
);
1185 /* Create LS-request object. */
1186 new = ospf_ls_request_new(lsah
);
1188 /* Lookup received LSA, then add LS request list. */
1189 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1191 /* ospf_lsa_more_recent is fine with NULL pointers */
1192 switch (ospf_lsa_more_recent(find
, new)) {
1194 /* Neighbour has a more recent LSA, we must request it
1196 ospf_ls_request_add(nbr
, new);
1199 /* If we have a copy of this LSA, it's either less
1201 * and we're requesting it from neighbour (the case
1203 * it's as recent and we both have same copy (this
1206 * In neither of these two cases is there any point in
1207 * describing our copy of the LSA to the neighbour in a
1208 * DB-Summary packet, if we're still intending to do so.
1210 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1211 * backward compatible optimisation to OSPF DB Exchange
1213 * DB Description process implemented here.
1216 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1217 ospf_lsa_discard(new);
1220 /* We have the more recent copy, nothing specific to do:
1221 * - no need to request neighbours stale copy
1222 * - must leave DB summary list copy alone
1224 if (IS_DEBUG_OSPF_EVENT
)
1226 "Packet [DD:RECV]: LSA received Type %d, ID %pI4 is not recent.",
1227 lsah
->type
, &lsah
->id
);
1228 ospf_lsa_discard(new);
1233 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1236 /* Both sides have no More, then we're done with Exchange */
1237 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1238 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1240 ospf_db_desc_send(nbr
);
1244 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1246 /* Send DD packet in reply.
1248 * Must be done to acknowledge the Master's DD, regardless of
1249 * whether we have more LSAs ourselves to describe.
1251 * This function will clear the 'More' bit, if after this DD
1252 * we have no more LSAs to describe to the master..
1254 ospf_db_desc_send(nbr
);
1256 /* Slave can raise ExchangeDone now, if master is also done */
1257 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1258 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1261 /* Save received neighbor values from DD. */
1262 ospf_db_desc_save_current(nbr
, dd
);
1265 ospf_ls_req_send(nbr
);
1268 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1269 struct ospf_neighbor
*nbr
)
1271 /* Is DD duplicated? */
1272 if (dd
->options
== nbr
->last_recv
.options
1273 && dd
->flags
== nbr
->last_recv
.flags
1274 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1280 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1281 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1282 struct stream
*s
, struct ospf_interface
*oi
,
1285 struct ospf_db_desc
*dd
;
1286 struct ospf_neighbor
*nbr
;
1288 /* Increment statistics. */
1291 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1293 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1295 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %pI4",
1301 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1302 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1305 "Packet[DD]: Neighbor %pI4 MTU %u is larger than [%s]'s MTU %u",
1306 &nbr
->router_id
, ntohs(dd
->mtu
), IF_NAME(oi
),
1312 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1314 * required. In fact at least JunOS sends DD packets with P bit clear.
1315 * Until proper solution is developped, this hack should help.
1317 * Update: According to the RFCs, N bit is specified /only/ for Hello
1318 * options, unfortunately its use in DD options is not specified. Hence
1320 * implementations follow E-bit semantics and set it in DD options, and
1322 * treat it as unspecified and hence follow the directive "default for
1323 * options is clear", ie unset.
1325 * Reset the flag, as ospfd follows E-bit semantics.
1327 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1328 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1329 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1330 if (IS_DEBUG_OSPF_EVENT
)
1332 "Packet[DD]: Neighbour %pI4: Has NSSA capability, sends with N bit clear in DD options",
1334 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1337 #ifdef REJECT_IF_TBIT_ON
1338 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1340 * In Hello protocol, optional capability must have checked
1341 * to prevent this T-bit enabled router be my neighbor.
1343 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %pI4: T-bit on?",
1347 #endif /* REJECT_IF_TBIT_ON */
1349 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1350 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1352 * This node is not configured to handle O-bit, for now.
1353 * Clear it to ignore unsupported capability proposed by
1356 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1359 /* Add event to thread. */
1360 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1362 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1364 "%s:Packet[DD]: Neighbor %pI4 state is %s, seq_num:0x%x, local:0x%x",
1365 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
1367 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
1368 ntohl(dd
->dd_seqnum
), nbr
->dd_seqnum
);
1370 /* Process DD packet by neighbor status. */
1371 switch (nbr
->state
) {
1375 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1377 "Packet[DD]: Neighbor %pI4 state is %s, packet discarded.",
1379 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1383 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1384 /* If the new state is ExStart, the processing of the current
1385 packet should then continue in this new state by falling
1386 through to case ExStart below. */
1387 if (nbr
->state
!= NSM_ExStart
)
1392 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1393 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1394 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1396 /* We're Slave---obey */
1397 if (CHECK_FLAG(oi
->ospf
->config
,
1398 OSPF_LOG_ADJACENCY_DETAIL
))
1400 "Packet[DD]: Neighbor %pI4 Negotiation done (Slave).",
1403 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1406 UNSET_FLAG(nbr
->dd_flags
,
1407 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1409 /* We're Master, ignore the initial DBD from
1411 if (CHECK_FLAG(oi
->ospf
->config
,
1412 OSPF_LOG_ADJACENCY_DETAIL
))
1414 "Packet[DD]: Neighbor %pI4: Initial DBD from Slave, ignoring.",
1419 /* Ack from the Slave */
1420 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1421 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1422 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1425 "Packet[DD]: Neighbor %pI4 Negotiation done (Master).",
1427 /* Reset I, leaving MS */
1428 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1430 flog_warn(EC_OSPF_PACKET
,
1431 "Packet[DD]: Neighbor %pI4 Negotiation fails.",
1436 /* This is where the real Options are saved */
1437 nbr
->options
= dd
->options
;
1439 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1440 if (IS_DEBUG_OSPF_EVENT
)
1442 "Neighbor[%pI4] is %sOpaque-capable.",
1444 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1448 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1449 && IPV4_ADDR_SAME(&DR(oi
),
1450 &nbr
->address
.u
.prefix4
)) {
1453 "DR-neighbor[%pI4] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1455 /* This situation is undesirable, but not a real
1460 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1462 /* continue processing rest of packet. */
1463 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1466 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1467 if (IS_SET_DD_MS(nbr
->dd_flags
))
1468 /* Master: discard duplicated DD packet. */
1470 "Packet[DD] (Master): Neighbor %pI4 packet duplicated.",
1473 /* Slave: cause to retransmit the last Database
1477 "Packet[DD] [Slave]: Neighbor %pI4 packet duplicated.",
1479 ospf_db_desc_resend(nbr
);
1484 /* Otherwise DD packet should be checked. */
1485 /* Check Master/Slave bit mismatch */
1486 if (IS_SET_DD_MS(dd
->flags
)
1487 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1488 flog_warn(EC_OSPF_PACKET
,
1489 "Packet[DD]: Neighbor %pI4 MS-bit mismatch.",
1491 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1492 if (IS_DEBUG_OSPF_EVENT
)
1494 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1495 dd
->flags
, nbr
->dd_flags
);
1499 /* Check initialize bit is set. */
1500 if (IS_SET_DD_I(dd
->flags
)) {
1501 zlog_info("Packet[DD]: Neighbor %pI4 I-bit set.",
1503 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1507 /* Check DD Options. */
1508 if (dd
->options
!= nbr
->options
) {
1509 flog_warn(EC_OSPF_PACKET
,
1510 "Packet[DD]: Neighbor %pI4 options mismatch.",
1512 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1516 /* Check DD sequence number. */
1517 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1518 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1519 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1520 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1523 "Packet[DD]: Neighbor %pI4 sequence number mismatch.",
1525 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1529 /* Continue processing rest of packet. */
1530 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1534 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1535 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1536 /* Master should discard duplicate DD packet. */
1538 "Packet[DD]: Neighbor %pI4 duplicated, packet discarded.",
1542 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1543 < nbr
->v_inactivity
* 1000000LL) {
1544 /* In states Loading and Full the slave
1546 its last Database Description packet
1548 duplicate Database Description
1550 from the master. For this reason the
1552 wait RouterDeadInterval seconds
1554 last Database Description packet.
1556 Database Description packet from the
1558 this interval will generate a
1560 neighbor event. RFC2328 Section 10.8
1562 ospf_db_desc_resend(nbr
);
1568 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1571 flog_warn(EC_OSPF_PACKET
,
1572 "Packet[DD]: Neighbor %pI4 NSM illegal status %u.",
1573 &nbr
->router_id
, nbr
->state
);
1578 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1580 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1581 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1582 struct stream
*s
, struct ospf_interface
*oi
,
1585 struct ospf_neighbor
*nbr
;
1587 struct in_addr ls_id
;
1588 struct in_addr adv_router
;
1589 struct ospf_lsa
*find
;
1590 struct list
*ls_upd
;
1591 unsigned int length
;
1593 /* Increment statistics. */
1596 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1598 flog_warn(EC_OSPF_PACKET
,
1599 "Link State Request: Unknown Neighbor %pI4",
1604 /* Add event to thread. */
1605 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1607 /* Neighbor State should be Exchange or later. */
1608 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1609 && nbr
->state
!= NSM_Full
) {
1612 "Link State Request received from %pI4: Neighbor state is %s, packet discarded.",
1614 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1618 /* Send Link State Update for ALL requested LSAs. */
1619 ls_upd
= list_new();
1620 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1622 while (size
>= OSPF_LSA_KEY_SIZE
) {
1623 /* Get one slice of Link State Request. */
1624 ls_type
= stream_getl(s
);
1625 ls_id
.s_addr
= stream_get_ipv4(s
);
1626 adv_router
.s_addr
= stream_get_ipv4(s
);
1628 /* Verify LSA type. */
1629 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1630 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1631 list_delete(&ls_upd
);
1635 /* Search proper LSA in LSDB. */
1636 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1639 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1640 list_delete(&ls_upd
);
1644 /* Packet overflows MTU size, send immediately. */
1645 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1646 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1647 ospf_ls_upd_send(nbr
, ls_upd
,
1648 OSPF_SEND_PACKET_DIRECT
, 0);
1650 ospf_ls_upd_send(nbr
, ls_upd
,
1651 OSPF_SEND_PACKET_INDIRECT
, 0);
1653 /* Only remove list contents. Keep ls_upd. */
1654 list_delete_all_node(ls_upd
);
1656 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1659 /* Append LSA to update list. */
1660 listnode_add(ls_upd
, find
);
1661 length
+= ntohs(find
->data
->length
);
1663 size
-= OSPF_LSA_KEY_SIZE
;
1666 /* Send rest of Link State Update. */
1667 if (listcount(ls_upd
) > 0) {
1668 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1669 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1672 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1675 list_delete(&ls_upd
);
1677 list_delete(&ls_upd
);
1680 /* Get the list of LSAs from Link State Update packet.
1681 And process some validation -- RFC2328 Section 13. (1)-(2). */
1682 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1684 struct ospf_interface
*oi
, size_t size
)
1686 uint16_t count
, sum
;
1688 struct lsa_header
*lsah
;
1689 struct ospf_lsa
*lsa
;
1694 count
= stream_getl(s
);
1695 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1697 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1698 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1699 lsah
= (struct lsa_header
*)stream_pnt(s
);
1700 length
= ntohs(lsah
->length
);
1702 if (length
> size
) {
1705 "Link State Update: LSA length exceeds packet size.");
1709 /* Validate the LSA's LS checksum. */
1710 sum
= lsah
->checksum
;
1711 if (!ospf_lsa_checksum_valid(lsah
)) {
1712 /* (bug #685) more details in a one-line message make it
1714 * to identify problem source on the one hand and to
1716 * chance to compress repeated messages in syslog on the
1720 "Link State Update: LSA checksum error %x/%x, ID=%pI4 from: nbr %pI4, router ID %pI4, adv router %pI4",
1721 sum
, lsah
->checksum
, &lsah
->id
,
1722 &nbr
->src
, &nbr
->router_id
,
1727 /* Examine the LSA's LS type. */
1728 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1729 flog_warn(EC_OSPF_PACKET
,
1730 "Link State Update: Unknown LS type %d",
1736 * What if the received LSA's age is greater than MaxAge?
1737 * Treat it as a MaxAge case -- endo.
1739 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1740 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1742 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1743 #ifdef STRICT_OBIT_USAGE_CHECK
1744 if ((IS_OPAQUE_LSA(lsah
->type
)
1745 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1746 || (!IS_OPAQUE_LSA(lsah
->type
)
1747 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1749 * This neighbor must know the exact usage of
1751 * the bit will be set in Type-9,10,11 LSAs
1754 flog_warn(EC_OSPF_PACKET
,
1755 "LSA[Type%d:%pI4]: O-bit abuse?",
1756 lsah
->type
, &lsah
->id
);
1759 #endif /* STRICT_OBIT_USAGE_CHECK */
1761 /* Do not take in AS External Opaque-LSAs if we are a
1763 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1764 && nbr
->oi
->area
->external_routing
1765 != OSPF_AREA_DEFAULT
) {
1766 if (IS_DEBUG_OSPF_EVENT
)
1768 "LSA[Type%d:%pI4]: We are a stub, don't take this LSA.",
1773 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1774 flog_warn(EC_OSPF_PACKET
,
1775 "LSA[Type%d:%pI4]: Opaque capability mismatch?",
1776 lsah
->type
, &lsah
->id
);
1780 /* Create OSPF LSA instance. */
1781 lsa
= ospf_lsa_new_and_data(length
);
1783 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1784 /* We may wish to put some error checking if type NSSA comes in
1785 and area not in NSSA mode */
1786 switch (lsah
->type
) {
1787 case OSPF_AS_EXTERNAL_LSA
:
1788 case OSPF_OPAQUE_AS_LSA
:
1791 case OSPF_OPAQUE_LINK_LSA
:
1792 lsa
->oi
= oi
; /* Remember incoming interface for
1793 flooding control. */
1796 lsa
->area
= oi
->area
;
1800 memcpy(lsa
->data
, lsah
, length
);
1802 if (IS_DEBUG_OSPF_EVENT
)
1804 "LSA[Type%d:%pI4]: %p new LSA created with Link State Update",
1805 lsa
->data
->type
, &lsa
->data
->id
,
1807 listnode_add(lsas
, lsa
);
1813 /* Cleanup Update list. */
1814 static void ospf_upd_list_clean(struct list
*lsas
)
1816 struct listnode
*node
, *nnode
;
1817 struct ospf_lsa
*lsa
;
1819 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1820 ospf_lsa_discard(lsa
);
1825 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1826 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1827 struct ospf_header
*ospfh
, struct stream
*s
,
1828 struct ospf_interface
*oi
, uint16_t size
)
1830 struct ospf_neighbor
*nbr
;
1832 struct listnode
*node
, *nnode
;
1833 struct ospf_lsa
*lsa
= NULL
;
1834 /* unsigned long ls_req_found = 0; */
1836 /* Dis-assemble the stream, update each entry, re-encapsulate for
1839 /* Increment statistics. */
1842 /* Check neighbor. */
1843 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1845 flog_warn(EC_OSPF_PACKET
,
1846 "Link State Update: Unknown Neighbor %pI4 on int: %s",
1847 &ospfh
->router_id
, IF_NAME(oi
));
1851 /* Add event to thread. */
1852 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1854 /* Check neighbor state. */
1855 if (nbr
->state
< NSM_Exchange
) {
1856 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1858 "Link State Update: Neighbor[%pI4] state %s is less than Exchange",
1860 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1865 /* Get list of LSAs from Link State Update packet. - Also perorms Stages
1866 * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
1869 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1873 #define DISCARD_LSA(L, N) \
1875 if (IS_DEBUG_OSPF_EVENT) \
1877 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1879 N, (void *)lsa, (int)lsa->data->type); \
1880 ospf_lsa_discard(L); \
1884 /* Process each LSA received in the one packet.
1886 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1887 * text below are from the steps in RFC 2328, Section 13.
1889 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1890 struct ospf_lsa
*ls_ret
, *current
;
1893 if (IS_DEBUG_OSPF_NSSA
)
1894 zlog_debug("LSA Type-%d from %pI4, ID: %pI4, ADV: %pI4",
1895 lsa
->data
->type
, &ospfh
->router_id
,
1896 &lsa
->data
->id
, &lsa
->data
->adv_router
);
1898 listnode_delete(lsas
,
1899 lsa
); /* We don't need it in list anymore */
1901 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1904 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1906 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1909 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1912 /* Do take in Type-7's if we are an NSSA */
1914 /* If we are also an ABR, later translate them to a Type-5
1917 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1918 translate them to a separate Type-5 packet. */
1920 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1921 /* Reject from STUB or NSSA */
1922 if (nbr
->oi
->area
->external_routing
1923 != OSPF_AREA_DEFAULT
) {
1924 if (IS_DEBUG_OSPF_NSSA
)
1926 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1927 DISCARD_LSA(lsa
, 1);
1930 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1931 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1932 if (IS_DEBUG_OSPF_NSSA
)
1934 "Incoming NSSA LSA Discarded: Not NSSA Area");
1935 DISCARD_LSA(lsa
, 2);
1938 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1939 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1940 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1941 &lsa
->data
->adv_router
)) {
1943 EC_OSPF_ROUTER_LSA_MISMATCH
,
1944 "Incoming Router-LSA from %pI4 with Adv-ID[%pI4] != LS-ID[%pI4]",
1945 &ospfh
->router_id
, &lsa
->data
->id
,
1946 &lsa
->data
->adv_router
);
1948 EC_OSPF_DOMAIN_CORRUPT
,
1949 "OSPF domain compromised by attack or corruption. Verify correct operation of -ALL- OSPF routers.");
1950 DISCARD_LSA(lsa
, 0);
1953 /* Find the LSA in the current database. */
1955 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1957 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1959 no instance of the LSA in the router's link state database,
1960 and none of router's neighbors are in states Exchange or
1962 then take the following actions: */
1964 if (IS_LSA_MAXAGE(lsa
) && !current
1965 && ospf_check_nbr_status(oi
->ospf
)) {
1966 /* (4a) Response Link State Acknowledgment. */
1967 ospf_ls_ack_send(nbr
, lsa
);
1969 /* (4b) Discard LSA. */
1970 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1972 "Link State Update[%s]: LS age is equal to MaxAge.",
1975 DISCARD_LSA(lsa
, 3);
1978 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1979 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1980 &oi
->ospf
->router_id
)) {
1982 * Even if initial flushing seems to be completed, there
1984 * be a case that self-originated LSA with MaxAge still
1986 * in the routing domain.
1987 * Just send an LSAck message to cease retransmission.
1989 if (IS_LSA_MAXAGE(lsa
)) {
1990 zlog_info("LSA[%s]: Boomerang effect?",
1992 ospf_ls_ack_send(nbr
, lsa
);
1993 ospf_lsa_discard(lsa
);
1995 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
1996 ospf_opaque_lsa_refresh_schedule(
2002 * If an instance of self-originated Opaque-LSA is not
2004 * in the LSDB, there are some possible cases here.
2006 * 1) This node lost opaque-capability after restart.
2007 * 2) Else, a part of opaque-type is no more supported.
2008 * 3) Else, a part of opaque-id is no more supported.
2010 * Anyway, it is still this node's responsibility to
2012 * Otherwise, the LSA instance remains in the routing
2014 * until its age reaches to MaxAge.
2016 /* XXX: We should deal with this for *ALL* LSAs, not
2018 if (current
== NULL
) {
2019 if (IS_DEBUG_OSPF_EVENT
)
2021 "LSA[%s]: Previously originated Opaque-LSA,not found in the LSDB.",
2024 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2026 ospf_ls_ack_send(nbr
, lsa
);
2028 ospf_opaque_self_originated_lsa_received(nbr
,
2034 /* It might be happen that received LSA is self-originated
2036 * router ID is changed. So, we should check if LSA is a
2038 * Link State ID is one of the router's own IP interface
2039 * addresses but whose
2040 * Advertising Router is not equal to the router's own Router ID
2041 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2045 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2046 struct listnode
*oinode
, *oinnode
;
2047 struct ospf_interface
*out_if
;
2050 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2055 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2057 && (!(IPV4_ADDR_SAME(
2058 &oi
->ospf
->router_id
,
2059 &lsa
->data
->adv_router
)))) {
2060 if (out_if
->network_lsa_self
) {
2061 ospf_lsa_flush_area(
2063 if (IS_DEBUG_OSPF_EVENT
)
2065 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2069 ospf_lsa_discard(lsa
);
2079 /* (5) Find the instance of this LSA that is currently contained
2080 in the router's link state database. If there is no
2081 database copy, or the received LSA is more recent than
2082 the database copy the following steps must be performed.
2083 (The sub steps from RFC 2328 section 13 step (5) will be
2088 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2090 if (current
&& (lsa
->data
->ls_seqnum
==
2091 htonl(OSPF_MAX_SEQUENCE_NUMBER
)
2092 && !IS_LSA_MAXAGE(lsa
))) {
2094 "Link State Update[%s]: has Max Seq but not MaxAge. Dropping it",
2097 DISCARD_LSA(lsa
, 4);
2100 /* Actual flooding procedure. */
2101 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2102 < 0) /* Trap NSSA later. */
2103 DISCARD_LSA(lsa
, 5);
2107 /* (6) Else, If there is an instance of the LSA on the sending
2108 neighbor's Link state request list, an error has occurred in
2109 the Database Exchange process. In this case, restart the
2110 Database Exchange process by generating the neighbor event
2111 BadLSReq for the sending neighbor and stop processing the
2112 Link State Update packet. */
2114 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2115 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2118 "LSA[%s] instance exists on Link state request list",
2121 /* Clean list of LSAs. */
2122 ospf_upd_list_clean(lsas
);
2123 /* this lsa is not on lsas list already. */
2124 ospf_lsa_discard(lsa
);
2128 /* If the received LSA is the same instance as the database copy
2129 (i.e., neither one is more recent) the following two steps
2130 should be performed: */
2133 /* If the LSA is listed in the Link state retransmission
2135 for the receiving adjacency, the router itself is
2137 an acknowledgment for this LSA. The router should
2139 received LSA as an acknowledgment by removing the LSA
2141 the Link state retransmission list. This is termed
2143 "implied acknowledgment". */
2145 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2147 if (ls_ret
!= NULL
) {
2148 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2150 /* Delayed acknowledgment sent if advertisement
2152 from Designated Router, otherwise do nothing.
2154 if (oi
->state
== ISM_Backup
)
2158 ospf_lsa_lock(lsa
));
2160 DISCARD_LSA(lsa
, 6);
2162 /* Acknowledge the receipt of the LSA by sending a
2163 Link State Acknowledgment packet back out the
2167 ospf_ls_ack_send(nbr
, lsa
);
2168 DISCARD_LSA(lsa
, 7);
2172 /* The database copy is more recent. If the database copy
2173 has LS age equal to MaxAge and LS sequence number equal to
2174 MaxSequenceNumber, simply discard the received LSA without
2175 acknowledging it. (In this case, the LSA's LS sequence number
2177 wrapping, and the MaxSequenceNumber LSA must be completely
2178 flushed before any new LSA instance can be introduced). */
2180 else if (ret
> 0) /* Database copy is more recent */
2182 if (IS_LSA_MAXAGE(current
)
2183 && current
->data
->ls_seqnum
2184 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2185 DISCARD_LSA(lsa
, 8);
2187 /* Otherwise, as long as the database copy has not been
2189 Link State Update within the last MinLSArrival
2191 database copy back to the sending neighbor,
2193 a Link State Update Packet. The Link State Update
2195 be sent directly to the neighbor. In so doing, do not
2197 database copy of the LSA on the neighbor's link state
2198 retransmission list, and do not acknowledge the
2200 recent) LSA instance. */
2202 if (monotime_since(¤t
->tv_orig
, NULL
)
2203 >= ospf
->min_ls_arrival
* 1000LL)
2204 /* Trap NSSA type later.*/
2205 ospf_ls_upd_send_lsa(
2207 OSPF_SEND_PACKET_DIRECT
);
2208 DISCARD_LSA(lsa
, 9);
2214 assert(listcount(lsas
) == 0);
2218 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2219 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2220 struct stream
*s
, struct ospf_interface
*oi
,
2223 struct ospf_neighbor
*nbr
;
2225 /* increment statistics. */
2228 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2230 flog_warn(EC_OSPF_PACKET
,
2231 "Link State Acknowledgment: Unknown Neighbor %pI4",
2236 /* Add event to thread. */
2237 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
2239 if (nbr
->state
< NSM_Exchange
) {
2240 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2242 "Link State Acknowledgment: Neighbor[%pI4] state %s is less than Exchange",
2244 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2249 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2250 struct ospf_lsa
*lsa
, *lsr
;
2252 lsa
= ospf_lsa_new();
2253 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2254 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2256 /* lsah = (struct lsa_header *) stream_pnt (s); */
2257 size
-= OSPF_LSA_HEADER_SIZE
;
2258 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2260 if (lsa
->data
->type
< OSPF_MIN_LSA
2261 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2263 ospf_lsa_discard(lsa
);
2267 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2269 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0)
2270 ospf_ls_retransmit_delete(nbr
, lsr
);
2273 ospf_lsa_discard(lsa
);
2279 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2280 struct interface
**ifp
,
2281 struct stream
*ibuf
)
2286 ifindex_t ifindex
= 0;
2288 /* Header and data both require alignment. */
2289 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2292 memset(&msgh
, 0, sizeof(struct msghdr
));
2293 msgh
.msg_iov
= &iov
;
2294 msgh
.msg_iovlen
= 1;
2295 msgh
.msg_control
= (caddr_t
)buff
;
2296 msgh
.msg_controllen
= sizeof(buff
);
2298 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, MSG_DONTWAIT
,
2299 OSPF_MAX_PACKET_SIZE
+ 1);
2301 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
)
2302 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2303 safe_strerror(errno
));
2306 if ((unsigned int)ret
< sizeof(struct ip
)) {
2309 "ospf_recv_packet: discarding runt packet of length %d (ip header size is %u)",
2310 ret
, (unsigned int)sizeof(iph
));
2314 /* Note that there should not be alignment problems with this assignment
2315 because this is at the beginning of the stream data buffer. */
2316 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2317 sockopt_iphdrincl_swab_systoh(iph
);
2319 ip_len
= iph
->ip_len
;
2321 #if defined(__FreeBSD__) && (__FreeBSD_version < 1000000)
2323 * Kernel network code touches incoming IP header parameters,
2324 * before protocol specific processing.
2326 * 1) Convert byteorder to host representation.
2327 * --> ip_len, ip_id, ip_off
2329 * 2) Adjust ip_len to strip IP header size!
2330 * --> If user process receives entire IP packet via RAW
2331 * socket, it must consider adding IP header size to
2332 * the "ip_len" field of "ip" structure.
2334 * For more details, see <netinet/ip_input.c>.
2336 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2339 #if defined(__DragonFly__)
2341 * in DragonFly's raw socket, ip_len/ip_off are read
2342 * in network byte order.
2343 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2345 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2348 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2350 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2352 if (ret
!= ip_len
) {
2355 "ospf_recv_packet read length mismatch: ip_len is %d, but recvmsg returned %d",
2360 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2361 zlog_debug("%s: fd %d(%s) on interface %d(%s)", __func__
, fd
,
2362 ospf_get_name(ospf
), ifindex
,
2363 *ifp
? (*ifp
)->name
: "Unknown");
2367 static struct ospf_interface
*
2368 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2369 struct ip
*iph
, struct ospf_header
*ospfh
)
2371 struct ospf_interface
*rcv_oi
;
2372 struct ospf_vl_data
*vl_data
;
2373 struct ospf_area
*vl_area
;
2374 struct listnode
*node
;
2376 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2377 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2380 /* look for local OSPF interface matching the destination
2381 * to determine Area ID. We presume therefore the destination address
2382 * is unique, or at least (for "unnumbered" links), not used in other
2385 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2389 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2391 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2395 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2396 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2397 if (IS_DEBUG_OSPF_EVENT
)
2398 zlog_debug("associating packet with %s",
2399 IF_NAME(vl_data
->vl_oi
));
2400 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2401 if (IS_DEBUG_OSPF_EVENT
)
2403 "This VL is not up yet, sorry");
2407 return vl_data
->vl_oi
;
2411 if (IS_DEBUG_OSPF_EVENT
)
2412 zlog_debug("couldn't find any VL to associate the packet with");
2417 static int ospf_check_area_id(struct ospf_interface
*oi
,
2418 struct ospf_header
*ospfh
)
2420 /* Check match the Area ID of the receiving interface. */
2421 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2427 /* Unbound socket will accept any Raw IP packets if proto is matched.
2428 To prevent it, compare src IP address and i/f address with masking
2429 i/f network mask. */
2430 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2431 struct in_addr ip_src
)
2433 struct in_addr mask
, me
, him
;
2435 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2436 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2439 /* Ignore mask check for max prefix length (32) */
2440 if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
2441 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
)
2444 masklen2ip(oi
->address
->prefixlen
, &mask
);
2446 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2447 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2449 if (IPV4_ADDR_SAME(&me
, &him
))
2455 /* Return 1, if the packet is properly authenticated and checksummed,
2456 0 otherwise. In particular, check that AuType header field is valid and
2457 matches the locally configured AuType, and that D.5 requirements are met. */
2458 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2460 struct crypt_key
*ck
;
2461 uint16_t iface_auth_type
;
2462 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2464 switch (pkt_auth_type
) {
2465 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2466 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2467 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2470 "interface %s: auth-type mismatch, local %s, rcvd Null",
2472 lookup_msg(ospf_auth_type_str
,
2473 iface_auth_type
, NULL
));
2476 if (!ospf_check_sum(ospfh
)) {
2477 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2480 "interface %s: Null auth OK, but checksum error, Router-ID %pI4",
2486 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2487 if (OSPF_AUTH_SIMPLE
2488 != (iface_auth_type
= ospf_auth_type(oi
))) {
2489 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2492 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2494 lookup_msg(ospf_auth_type_str
,
2495 iface_auth_type
, NULL
));
2498 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2499 OSPF_AUTH_SIMPLE_SIZE
)) {
2500 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2501 flog_warn(EC_OSPF_PACKET
,
2502 "interface %s: Simple auth failed",
2506 if (!ospf_check_sum(ospfh
)) {
2507 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2510 "interface %s: Simple auth OK, checksum error, Router-ID %pI4",
2516 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2517 if (OSPF_AUTH_CRYPTOGRAPHIC
2518 != (iface_auth_type
= ospf_auth_type(oi
))) {
2519 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2522 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2524 lookup_msg(ospf_auth_type_str
,
2525 iface_auth_type
, NULL
));
2528 if (ospfh
->checksum
) {
2529 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2532 "interface %s: OSPF header checksum is not 0",
2536 /* only MD5 crypto method can pass ospf_packet_examin() */
2537 if (NULL
== (ck
= listgetdata(
2538 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2539 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2540 /* Condition above uses the last key ID on the list,
2542 different from what ospf_crypt_key_lookup() does. A
2544 !ospf_check_md5_digest(oi
, ospfh
)) {
2545 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2546 flog_warn(EC_OSPF_MD5
,
2547 "interface %s: MD5 auth failed",
2553 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2556 "interface %s: invalid packet auth-type (%02x)",
2557 IF_NAME(oi
), pkt_auth_type
);
2562 static int ospf_check_sum(struct ospf_header
*ospfh
)
2567 /* clear auth_data for checksum. */
2568 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2570 /* keep checksum and clear. */
2571 sum
= ospfh
->checksum
;
2572 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2574 /* calculate checksum. */
2575 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2578 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2586 /* Verify, that given link/TOS records are properly sized/aligned and match
2587 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2588 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2590 const uint16_t num_links
)
2592 unsigned counted_links
= 0, thislinklen
;
2594 while (linkbytes
>= OSPF_ROUTER_LSA_LINK_SIZE
) {
2596 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2597 if (thislinklen
> linkbytes
) {
2598 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2599 zlog_debug("%s: length error in link block #%u",
2600 __func__
, counted_links
);
2603 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2604 linkbytes
-= thislinklen
;
2607 if (counted_links
!= num_links
) {
2608 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2609 zlog_debug("%s: %u link blocks declared, %u present",
2610 __func__
, num_links
, counted_links
);
2616 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2617 minimum length constraint). */
2618 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2619 const uint8_t headeronly
)
2622 struct router_lsa
*rlsa
;
2623 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2624 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2625 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2626 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2627 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2631 switch (lsah
->type
) {
2632 case OSPF_ROUTER_LSA
: {
2634 * RFC2328 A.4.2, LSA header + 4 bytes followed by N>=0
2635 * (12+)-byte link blocks
2637 size_t linkbytes_len
= lsalen
- OSPF_LSA_HEADER_SIZE
2638 - OSPF_ROUTER_LSA_MIN_SIZE
;
2641 * LSA link blocks are variable length but always multiples of
2642 * 4; basic sanity check
2644 if (linkbytes_len
% 4 != 0)
2650 rlsa
= (struct router_lsa
*)lsah
;
2652 ret
= ospf_router_lsa_links_examin(
2653 (struct router_lsa_link
*)rlsa
->link
,
2655 ntohs(rlsa
->links
));
2658 case OSPF_AS_EXTERNAL_LSA
:
2659 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2661 case OSPF_AS_NSSA_LSA
:
2662 /* RFC3101 C, idem */
2663 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2664 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2669 /* Following LSA types are considered OK length-wise as soon as their
2671 * length constraint is met and length of the whole LSA is a multiple of
2673 * (basic LSA header size is already a multiple of 4). */
2674 case OSPF_NETWORK_LSA
:
2675 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2676 case OSPF_SUMMARY_LSA
:
2677 case OSPF_ASBR_SUMMARY_LSA
:
2678 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2680 case OSPF_OPAQUE_LINK_LSA
:
2681 case OSPF_OPAQUE_AREA_LSA
:
2682 case OSPF_OPAQUE_AS_LSA
:
2683 /* RFC5250 A.2, "some number of octets (of application-specific
2684 * data) padded to 32-bit alignment." This is considered
2686 * to 4-byte alignment of all other LSA types, see
2687 * OSPF-ALIGNMENT.txt
2688 * file for the detailed analysis of this passage. */
2689 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2692 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2693 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2697 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2698 zlog_debug("%s: alignment error in %s", __func__
,
2699 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2703 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2704 includes verification of LSA blocks length/alignment and dispatching
2705 of deeper-level checks. */
2707 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2708 size_t length
, const uint8_t headeronly
,
2709 /* When declared_num_lsas is not 0, compare it to the real
2711 and treat the difference as an error. */
2712 const uint32_t declared_num_lsas
)
2714 uint32_t counted_lsas
= 0;
2718 if (length
< OSPF_LSA_HEADER_SIZE
) {
2719 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2721 "%s: undersized (%zu B) trailing (#%u) LSA header",
2722 __func__
, length
, counted_lsas
);
2725 /* save on ntohs() calls here and in the LSA validator */
2726 lsalen
= ntohs(lsah
->length
);
2727 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2728 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2730 "%s: malformed LSA header #%u, declared length is %u B",
2731 __func__
, counted_lsas
, lsalen
);
2735 /* less checks here and in ospf_lsa_examin() */
2736 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2737 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2739 "%s: malformed header-only LSA #%u",
2740 __func__
, counted_lsas
);
2743 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2744 + OSPF_LSA_HEADER_SIZE
);
2745 length
-= OSPF_LSA_HEADER_SIZE
;
2747 /* make sure the input buffer is deep enough before
2749 if (lsalen
> length
) {
2750 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2752 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2753 __func__
, counted_lsas
, lsalen
,
2757 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2758 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2759 zlog_debug("%s: malformed LSA #%u",
2760 __func__
, counted_lsas
);
2763 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2769 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2770 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2772 "%s: #LSAs declared (%u) does not match actual (%u)",
2773 __func__
, declared_num_lsas
, counted_lsas
);
2779 /* Verify a complete OSPF packet for proper sizing/alignment. */
2780 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2781 const unsigned bytesonwire
)
2783 uint16_t bytesdeclared
, bytesauth
;
2785 struct ospf_ls_update
*lsupd
;
2787 /* Length, 1st approximation. */
2788 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2789 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2790 zlog_debug("%s: undersized (%u B) packet", __func__
,
2794 /* Now it is safe to access header fields. Performing length check,
2796 * for possible extra bytes of crypto auth/padding, which are not
2798 * in the OSPF header "length" field. */
2799 if (oh
->version
!= OSPF_VERSION
) {
2800 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2801 zlog_debug("%s: invalid (%u) protocol version",
2802 __func__
, oh
->version
);
2805 bytesdeclared
= ntohs(oh
->length
);
2806 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2809 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2810 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2812 "%s: unsupported crypto auth length (%u B)",
2813 __func__
, oh
->u
.crypt
.auth_data_len
);
2816 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2818 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2819 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2821 "%s: packet length error (%u real, %u+%u declared)",
2822 __func__
, bytesonwire
, bytesdeclared
,
2826 /* Length, 2nd approximation. The type-specific constraint is checked
2827 against declared length, not amount of bytes on wire. */
2828 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2830 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2831 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2832 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2834 lookup_msg(ospf_packet_type_str
, oh
->type
,
2839 case OSPF_MSG_HELLO
:
2840 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2842 by N>=0 router-IDs. */
2843 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2848 case OSPF_MSG_DB_DESC
:
2849 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2851 by N>=0 header-only LSAs. */
2852 ret
= ospf_lsaseq_examin(
2853 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2854 + OSPF_DB_DESC_MIN_SIZE
),
2855 bytesdeclared
- OSPF_HEADER_SIZE
2856 - OSPF_DB_DESC_MIN_SIZE
,
2857 1, /* header-only LSAs */
2860 case OSPF_MSG_LS_REQ
:
2861 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2862 * request blocks. */
2863 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2868 case OSPF_MSG_LS_UPD
:
2869 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2871 by N>=0 full LSAs (with N declared beforehand). */
2872 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2873 + OSPF_HEADER_SIZE
);
2874 ret
= ospf_lsaseq_examin(
2875 (struct lsa_header
*)((caddr_t
)lsupd
2876 + OSPF_LS_UPD_MIN_SIZE
),
2877 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2879 ntohl(lsupd
->num_lsas
) /* 32 bits */
2882 case OSPF_MSG_LS_ACK
:
2883 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2885 ret
= ospf_lsaseq_examin(
2886 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2887 + OSPF_LS_ACK_MIN_SIZE
),
2888 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2889 1, /* header-only LSAs */
2893 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2894 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2898 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2899 zlog_debug("%s: malformed %s packet", __func__
,
2900 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2904 /* OSPF Header verification. */
2905 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2906 struct ip
*iph
, struct ospf_header
*ospfh
)
2908 /* Check Area ID. */
2909 if (!ospf_check_area_id(oi
, ospfh
)) {
2910 flog_warn(EC_OSPF_PACKET
,
2911 "interface %s: ospf_read invalid Area ID %pI4",
2912 IF_NAME(oi
), &ospfh
->area_id
);
2916 /* Check network mask, Silently discarded. */
2917 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2920 "interface %s: ospf_read network address is not same [%pI4]",
2921 IF_NAME(oi
), &iph
->ip_src
);
2925 /* Check authentication. The function handles logging actions, where
2927 if (!ospf_check_auth(oi
, ospfh
))
2933 enum ospf_read_return_enum
{
2938 static enum ospf_read_return_enum
ospf_read_helper(struct ospf
*ospf
)
2941 struct stream
*ibuf
;
2942 struct ospf_interface
*oi
;
2944 struct ospf_header
*ospfh
;
2946 struct connected
*c
;
2947 struct interface
*ifp
= NULL
;
2949 stream_reset(ospf
->ibuf
);
2950 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2952 return OSPF_READ_ERROR
;
2955 * This raw packet is known to be at least as big as its
2956 * IP header. Note that there should not be alignment problems with
2957 * this assignment because this is at the beginning of the
2958 * stream data buffer.
2960 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2962 * Note that sockopt_iphdrincl_swab_systoh was called in
2967 * Handle cases where the platform does not support
2968 * retrieving the ifindex, and also platforms (such as
2969 * Solaris 8) that claim to support ifindex retrieval but do
2972 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2977 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2979 "%s: Unable to determine incoming interface from: %pI4(%s)",
2980 __func__
, &iph
->ip_src
,
2981 ospf_get_name(ospf
));
2982 return OSPF_READ_CONTINUE
;
2986 if (ospf
->vrf_id
== VRF_DEFAULT
&& ospf
->vrf_id
!= ifp
->vrf_id
) {
2988 * We may have a situation where l3mdev_accept == 1
2989 * let's just kindly drop the packet and move on.
2990 * ospf really really really does not like when
2991 * we receive the same packet multiple times.
2993 return OSPF_READ_CONTINUE
;
2996 /* Self-originated packet should be discarded silently. */
2997 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
2998 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
3000 "ospf_read[%pI4]: Dropping self-originated packet",
3003 return OSPF_READ_CONTINUE
;
3006 /* Check that we have enough for an IP header */
3007 if ((unsigned int)(iph
->ip_hl
<< 2) >= STREAM_READABLE(ibuf
)) {
3008 if ((unsigned int)(iph
->ip_hl
<< 2) == STREAM_READABLE(ibuf
)) {
3011 "Rx'd IP packet with OSPF protocol number but no payload");
3015 "IP header length field claims header is %u bytes, but we only have %zu",
3016 (unsigned int)(iph
->ip_hl
<< 2),
3017 STREAM_READABLE(ibuf
));
3020 return OSPF_READ_ERROR
;
3022 stream_forward_getp(ibuf
, iph
->ip_hl
<< 2);
3024 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3026 != ospf_packet_examin(ospfh
, stream_get_endp(ibuf
)
3027 - stream_get_getp(ibuf
)))
3028 return OSPF_READ_CONTINUE
;
3029 /* Now it is safe to access all fields of OSPF packet header. */
3031 /* associate packet with ospf interface */
3032 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3035 * ospf_verify_header() relies on a valid "oi" and thus can be called
3036 * only after the passive/backbone/other checks below are passed.
3037 * These checks in turn access the fields of unverified "ospfh"
3038 * structure for their own purposes and must remain very accurate
3042 /* If incoming interface is passive one, ignore it. */
3043 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3044 if (IS_DEBUG_OSPF_EVENT
)
3046 "ignoring packet from router %pI4 sent to %pI4, received on a passive interface, %pI4",
3047 &ospfh
->router_id
, &iph
->ip_dst
,
3048 &oi
->address
->u
.prefix4
);
3050 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3051 /* Try to fix multicast membership.
3052 * Some OS:es may have problems in this area,
3053 * make sure it is removed.
3055 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3056 ospf_if_set_multicast(oi
);
3058 return OSPF_READ_CONTINUE
;
3062 /* if no local ospf_interface,
3063 * or header area is backbone but ospf_interface is not
3064 * check for VLINK interface
3067 || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3068 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3069 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3071 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3073 "Packet from [%pI4] received on link %s but no ospf_interface",
3074 &iph
->ip_src
, ifp
->name
);
3075 return OSPF_READ_CONTINUE
;
3080 * else it must be a local ospf interface, check it was
3081 * received on correct link
3083 else if (oi
->ifp
!= ifp
) {
3084 if (IS_DEBUG_OSPF_EVENT
)
3085 flog_warn(EC_OSPF_PACKET
,
3086 "Packet from [%pI4] received on wrong link %s",
3087 &iph
->ip_src
, ifp
->name
);
3088 return OSPF_READ_CONTINUE
;
3089 } else if (oi
->state
== ISM_Down
) {
3092 "Ignoring packet from %pI4 to %pI4 received on interface that is down [%s]; interface flags are %s",
3093 &iph
->ip_src
, &iph
->ip_dst
, ifp
->name
,
3094 if_flag_dump(ifp
->flags
));
3095 /* Fix multicast memberships? */
3096 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3097 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3098 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3099 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3100 if (oi
->multicast_memberships
)
3101 ospf_if_set_multicast(oi
);
3102 return OSPF_READ_CONTINUE
;
3106 * If the received packet is destined for AllDRouters, the
3107 * packet should be accepted only if the received ospf
3108 * interface state is either DR or Backup -- endo.
3110 * I wonder who endo is?
3112 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3113 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3116 "Dropping packet for AllDRouters from [%pI4] via [%s] (ISM: %s)",
3117 &iph
->ip_src
, IF_NAME(oi
),
3118 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3119 /* Try to fix multicast membership. */
3120 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3121 ospf_if_set_multicast(oi
);
3122 return OSPF_READ_CONTINUE
;
3125 /* Verify more OSPF header fields. */
3126 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3128 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3130 "ospf_read[%pI4]: Header check failed, dropping.",
3132 return OSPF_READ_CONTINUE
;
3135 /* Show debug receiving packet. */
3136 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3137 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3139 "-----------------------------------------------------");
3140 ospf_packet_dump(ibuf
);
3143 zlog_debug("%s received from [%pI4] via [%s]",
3144 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3145 &ospfh
->router_id
, IF_NAME(oi
));
3146 zlog_debug(" src [%pI4],", &iph
->ip_src
);
3147 zlog_debug(" dst [%pI4]", &iph
->ip_dst
);
3149 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3151 "-----------------------------------------------------");
3154 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3156 /* Adjust size to message length. */
3157 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3159 /* Read rest of the packet and call each sort of packet routine.
3161 switch (ospfh
->type
) {
3162 case OSPF_MSG_HELLO
:
3163 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3165 case OSPF_MSG_DB_DESC
:
3166 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3168 case OSPF_MSG_LS_REQ
:
3169 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3171 case OSPF_MSG_LS_UPD
:
3172 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3174 case OSPF_MSG_LS_ACK
:
3175 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3180 "interface %s(%s): OSPF packet header type %d is illegal",
3181 IF_NAME(oi
), ospf_get_name(ospf
), ospfh
->type
);
3185 return OSPF_READ_CONTINUE
;
3188 /* Starting point of packet process function. */
3189 int ospf_read(struct thread
*thread
)
3193 enum ospf_read_return_enum ret
;
3195 /* first of all get interface pointer. */
3196 ospf
= THREAD_ARG(thread
);
3198 /* prepare for next packet. */
3199 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
3201 while (count
< ospf
->write_oi_count
) {
3203 ret
= ospf_read_helper(ospf
);
3205 case OSPF_READ_ERROR
:
3207 case OSPF_READ_CONTINUE
:
3215 /* Make OSPF header. */
3216 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3219 struct ospf_header
*ospfh
;
3221 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3223 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3224 ospfh
->type
= (uint8_t)type
;
3226 ospfh
->router_id
= oi
->ospf
->router_id
;
3228 ospfh
->checksum
= 0;
3229 ospfh
->area_id
= oi
->area
->area_id
;
3230 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3232 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3234 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3237 /* Make Authentication Data. */
3238 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3240 struct crypt_key
*ck
;
3242 switch (ospf_auth_type(oi
)) {
3243 case OSPF_AUTH_NULL
:
3244 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3247 case OSPF_AUTH_SIMPLE
:
3248 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3249 OSPF_AUTH_SIMPLE_SIZE
);
3251 case OSPF_AUTH_CRYPTOGRAPHIC
:
3252 /* If key is not set, then set 0. */
3253 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3254 ospfh
->u
.crypt
.zero
= 0;
3255 ospfh
->u
.crypt
.key_id
= 0;
3256 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3259 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3260 ospfh
->u
.crypt
.zero
= 0;
3261 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3262 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3264 /* note: the seq is done in ospf_make_md5_digest() */
3267 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3275 /* Fill rest of OSPF header. */
3276 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3279 struct ospf_header
*ospfh
;
3281 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3284 ospfh
->length
= htons(length
);
3286 /* Calculate checksum. */
3287 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3288 ospfh
->checksum
= in_cksum(ospfh
, length
);
3290 ospfh
->checksum
= 0;
3292 /* Add Authentication Data. */
3293 ospf_make_auth(oi
, ospfh
);
3296 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3298 struct ospf_neighbor
*nbr
;
3299 struct route_node
*rn
;
3300 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3301 struct in_addr mask
;
3305 /* Set netmask of interface. */
3306 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3307 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3308 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3309 masklen2ip(oi
->address
->prefixlen
, &mask
);
3311 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3312 stream_put_ipv4(s
, mask
.s_addr
);
3314 /* Set Hello Interval. */
3315 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3316 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3318 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3320 if (IS_DEBUG_OSPF_EVENT
)
3321 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3325 stream_putc(s
, OPTIONS(oi
));
3327 /* Set Router Priority. */
3328 stream_putc(s
, PRIORITY(oi
));
3330 /* Set Router Dead Interval. */
3331 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3333 /* Set Designated Router. */
3334 stream_put_ipv4(s
, DR(oi
).s_addr
);
3336 p
= stream_get_endp(s
);
3338 /* Set Backup Designated Router. */
3339 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3341 /* Add neighbor seen. */
3342 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3343 if ((nbr
= rn
->info
))
3344 if (nbr
->router_id
.s_addr
3345 != INADDR_ANY
) /* Ignore 0.0.0.0 node. */
3347 != NSM_Attempt
) /* Ignore Down neighbor. */
3349 != NSM_Down
) /* This is myself for
3351 if (!IPV4_ADDR_SAME(
3353 &oi
->ospf
->router_id
)) {
3354 /* Check neighbor is
3356 if (nbr
->d_router
.s_addr
3370 /* Hello packet overflows interface MTU. */
3371 if (length
+ sizeof(uint32_t)
3372 > ospf_packet_max(oi
)) {
3374 EC_OSPF_LARGE_HELLO
,
3375 "Oversized Hello packet! Larger than MTU. Not sending it out");
3386 /* Let neighbor generate BackupSeen. */
3388 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3393 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3394 struct ospf_neighbor
*nbr
, struct stream
*s
)
3396 struct ospf_lsa
*lsa
;
3397 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3401 struct ospf_lsdb
*lsdb
;
3403 /* Set Interface MTU. */
3404 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3407 stream_putw(s
, oi
->ifp
->mtu
);
3410 options
= OPTIONS(oi
);
3411 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3412 SET_FLAG(options
, OSPF_OPTION_O
);
3413 stream_putc(s
, options
);
3416 pp
= stream_get_endp(s
);
3417 stream_putc(s
, nbr
->dd_flags
);
3419 /* Set DD Sequence Number. */
3420 stream_putl(s
, nbr
->dd_seqnum
);
3422 /* shortcut unneeded walk of (empty) summary LSDBs */
3423 if (ospf_db_summary_isempty(nbr
))
3426 /* Describe LSA Header from Database Summary List. */
3427 lsdb
= &nbr
->db_sum
;
3429 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3430 struct route_table
*table
= lsdb
->type
[i
].db
;
3431 struct route_node
*rn
;
3433 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3434 if ((lsa
= rn
->info
) != NULL
) {
3435 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3436 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3437 /* Suppress advertising
3438 * opaque-information. */
3439 /* Remove LSA from DB summary list. */
3440 ospf_lsdb_delete(lsdb
, lsa
);
3444 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3445 struct lsa_header
*lsah
;
3448 /* DD packet overflows interface MTU. */
3449 if (length
+ OSPF_LSA_HEADER_SIZE
3450 > ospf_packet_max(oi
))
3453 /* Keep pointer to LS age. */
3454 lsah
= (struct lsa_header
3459 /* Proceed stream pointer. */
3460 stream_put(s
, lsa
->data
,
3461 OSPF_LSA_HEADER_SIZE
);
3462 length
+= OSPF_LSA_HEADER_SIZE
;
3465 ls_age
= LS_AGE(lsa
);
3466 lsah
->ls_age
= htons(ls_age
);
3469 /* Remove LSA from DB summary list. */
3470 ospf_lsdb_delete(lsdb
, lsa
);
3474 /* Update 'More' bit */
3475 if (ospf_db_summary_isempty(nbr
)) {
3477 if (nbr
->state
>= NSM_Exchange
) {
3478 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3479 /* Rewrite DD flags */
3480 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3482 assert(IS_SET_DD_M(nbr
->dd_flags
));
3488 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3489 unsigned long delta
, struct ospf_neighbor
*nbr
,
3490 struct ospf_lsa
*lsa
)
3492 struct ospf_interface
*oi
;
3496 /* LS Request packet overflows interface MTU
3497 * delta is just number of bytes required for 1 LS Req
3498 * ospf_packet_max will return the number of bytes can
3499 * be accomodated without ospf header. So length+delta
3500 * can be compared to ospf_packet_max
3501 * to check if it can fit another lsreq in the same packet.
3504 if (*length
+ delta
> ospf_packet_max(oi
))
3507 stream_putl(s
, lsa
->data
->type
);
3508 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3509 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3511 ospf_lsa_unlock(&nbr
->ls_req_last
);
3512 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3518 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3520 struct ospf_lsa
*lsa
;
3521 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3522 unsigned long delta
= 12;
3523 struct route_table
*table
;
3524 struct route_node
*rn
;
3526 struct ospf_lsdb
*lsdb
;
3528 lsdb
= &nbr
->ls_req
;
3530 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3531 table
= lsdb
->type
[i
].db
;
3532 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3533 if ((lsa
= (rn
->info
)) != NULL
)
3534 if (ospf_make_ls_req_func(s
, &length
, delta
,
3537 route_unlock_node(rn
);
3544 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3548 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3550 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3553 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3556 struct ospf_lsa
*lsa
;
3557 struct listnode
*node
;
3558 uint16_t length
= 0;
3559 unsigned int size_noauth
;
3560 unsigned long delta
= stream_get_endp(s
);
3564 if (IS_DEBUG_OSPF_EVENT
)
3565 zlog_debug("ospf_make_ls_upd: Start");
3567 pp
= stream_get_endp(s
);
3568 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3569 length
+= OSPF_LS_UPD_MIN_SIZE
;
3571 /* Calculate amount of packet usable for data. */
3572 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3574 while ((node
= listhead(update
)) != NULL
) {
3575 struct lsa_header
*lsah
;
3578 if (IS_DEBUG_OSPF_EVENT
)
3579 zlog_debug("ospf_make_ls_upd: List Iteration %d",
3582 lsa
= listgetdata(node
);
3586 /* Will it fit? Minimum it has to fit atleast one */
3587 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3591 /* Keep pointer to LS age. */
3592 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3593 + stream_get_endp(s
));
3595 /* Put LSA to Link State Request. */
3596 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3599 /* each hop must increment an lsa_age by transmit_delay
3600 of OSPF interface */
3601 ls_age
= ls_age_increment(lsa
,
3602 OSPF_IF_PARAM(oi
, transmit_delay
));
3603 lsah
->ls_age
= htons(ls_age
);
3605 length
+= ntohs(lsa
->data
->length
);
3608 list_delete_node(update
, node
);
3609 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3612 /* Now set #LSAs. */
3613 stream_putl_at(s
, pp
, count
);
3615 if (IS_DEBUG_OSPF_EVENT
)
3616 zlog_debug("ospf_make_ls_upd: Stop");
3620 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3623 struct listnode
*node
, *nnode
;
3624 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3625 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3626 struct ospf_lsa
*lsa
;
3628 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3631 /* LS Ack packet overflows interface MTU
3632 * delta is just number of bytes required for
3633 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3634 * the number of bytes can be accomodated without
3635 * ospf header. So length+delta can be compared
3636 * against ospf_packet_max to check if it can fit
3637 * another ls header in the same packet.
3639 if ((length
+ delta
) > ospf_packet_max(oi
))
3642 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3643 length
+= OSPF_LSA_HEADER_SIZE
;
3645 listnode_delete(ack
, lsa
);
3646 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3652 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3654 struct ospf_packet
*op
;
3655 uint16_t length
= OSPF_HEADER_SIZE
;
3657 op
= ospf_packet_new(oi
->ifp
->mtu
);
3659 /* Prepare OSPF common header. */
3660 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3662 /* Prepare OSPF Hello body. */
3663 length
+= ospf_make_hello(oi
, op
->s
);
3664 if (length
== OSPF_HEADER_SIZE
) {
3665 /* Hello overshooting MTU */
3666 ospf_packet_free(op
);
3670 /* Fill OSPF header. */
3671 ospf_fill_header(oi
, op
->s
, length
);
3673 /* Set packet length. */
3674 op
->length
= length
;
3676 op
->dst
.s_addr
= addr
;
3678 if (IS_DEBUG_OSPF_EVENT
) {
3679 if (oi
->ospf
->vrf_id
)
3681 "%s: Hello Tx interface %s ospf vrf %s id %u",
3682 __func__
, oi
->ifp
->name
,
3683 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3686 /* Add packet to the top of the interface output queue, so that they
3687 * can't get delayed by things like long queues of LS Update packets
3689 ospf_packet_add_top(oi
, op
);
3691 /* Hook thread to write packet. */
3692 OSPF_ISM_WRITE_ON(oi
->ospf
);
3695 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3697 struct ospf_interface
*oi
;
3702 /* If this is passive interface, do not send OSPF Hello. */
3703 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3706 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3709 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3712 if (PRIORITY(oi
) == 0)
3715 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3716 && oi
->state
!= ISM_Backup
)
3719 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3722 int ospf_poll_timer(struct thread
*thread
)
3724 struct ospf_nbr_nbma
*nbr_nbma
;
3726 nbr_nbma
= THREAD_ARG(thread
);
3727 nbr_nbma
->t_poll
= NULL
;
3729 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3730 zlog_debug("NSM[%s:%pI4]: Timer (Poll timer expire)",
3731 IF_NAME(nbr_nbma
->oi
), &nbr_nbma
->addr
);
3733 ospf_poll_send(nbr_nbma
);
3735 if (nbr_nbma
->v_poll
> 0)
3736 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3743 int ospf_hello_reply_timer(struct thread
*thread
)
3745 struct ospf_neighbor
*nbr
;
3747 nbr
= THREAD_ARG(thread
);
3748 nbr
->t_hello_reply
= NULL
;
3750 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3751 zlog_debug("NSM[%s:%pI4]: Timer (hello-reply timer expire)",
3752 IF_NAME(nbr
->oi
), &nbr
->router_id
);
3754 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3759 /* Send OSPF Hello. */
3760 void ospf_hello_send(struct ospf_interface
*oi
)
3762 /* If this is passive interface, do not send OSPF Hello. */
3763 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3766 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3767 struct ospf_neighbor
*nbr
;
3768 struct route_node
*rn
;
3770 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3771 if ((nbr
= rn
->info
))
3772 if (nbr
!= oi
->nbr_self
)
3773 if (nbr
->state
!= NSM_Down
) {
3774 /* RFC 2328 Section 9.5.1
3775 If the router is not
3776 eligible to become Designated
3778 it must periodically send
3779 Hello Packets to both the
3780 Designated Router and the
3781 Backup Designated Router (if
3784 if (PRIORITY(oi
) == 0
3795 /* If the router is eligible to
3796 become Designated Router, it
3797 must periodically send Hello
3798 Packets to all neighbors that
3799 are also eligible. In
3800 addition, if the router is
3802 Designated Router or Backup
3803 Designated Router, it must
3805 send periodic Hello Packets
3806 to all other neighbors. */
3808 if (nbr
->priority
== 0
3809 && oi
->state
== ISM_DROther
)
3811 /* if oi->state == Waiting, send
3812 * hello to all neighbors */
3813 ospf_hello_send_sub(
3815 nbr
->address
.u
.prefix4
3819 /* Decide destination address. */
3820 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3821 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3823 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3827 /* Send OSPF Database Description. */
3828 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3830 struct ospf_interface
*oi
;
3831 struct ospf_packet
*op
;
3832 uint16_t length
= OSPF_HEADER_SIZE
;
3835 op
= ospf_packet_new(oi
->ifp
->mtu
);
3837 /* Prepare OSPF common header. */
3838 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3840 /* Prepare OSPF Database Description body. */
3841 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3843 /* Fill OSPF header. */
3844 ospf_fill_header(oi
, op
->s
, length
);
3846 /* Set packet length. */
3847 op
->length
= length
;
3849 /* Decide destination address. */
3850 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3851 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3853 op
->dst
= nbr
->address
.u
.prefix4
;
3855 /* Add packet to the interface output queue. */
3856 ospf_packet_add(oi
, op
);
3858 /* Hook thread to write packet. */
3859 OSPF_ISM_WRITE_ON(oi
->ospf
);
3861 /* Remove old DD packet, then copy new one and keep in neighbor
3864 ospf_packet_free(nbr
->last_send
);
3865 nbr
->last_send
= ospf_packet_dup(op
);
3866 monotime(&nbr
->last_send_ts
);
3867 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3869 "%s:Packet[DD]: %pI4 DB Desc send with seqnum:%x , flags:%x",
3870 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
3871 &nbr
->router_id
, nbr
->dd_seqnum
,
3875 /* Re-send Database Description. */
3876 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3878 struct ospf_interface
*oi
;
3882 /* Add packet to the interface output queue. */
3883 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3885 /* Hook thread to write packet. */
3886 OSPF_ISM_WRITE_ON(oi
->ospf
);
3887 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3889 "%s:Packet[DD]: %pI4 DB Desc resend with seqnum:%x , flags:%x",
3890 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
3891 &nbr
->router_id
, nbr
->dd_seqnum
,
3895 /* Send Link State Request. */
3896 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3898 struct ospf_interface
*oi
;
3899 struct ospf_packet
*op
;
3900 uint16_t length
= OSPF_HEADER_SIZE
;
3903 op
= ospf_packet_new(oi
->ifp
->mtu
);
3905 /* Prepare OSPF common header. */
3906 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3908 /* Prepare OSPF Link State Request body. */
3909 length
+= ospf_make_ls_req(nbr
, op
->s
);
3910 if (length
== OSPF_HEADER_SIZE
) {
3911 ospf_packet_free(op
);
3915 /* Fill OSPF header. */
3916 ospf_fill_header(oi
, op
->s
, length
);
3918 /* Set packet length. */
3919 op
->length
= length
;
3921 /* Decide destination address. */
3922 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3923 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3925 op
->dst
= nbr
->address
.u
.prefix4
;
3927 /* Add packet to the interface output queue. */
3928 ospf_packet_add(oi
, op
);
3930 /* Hook thread to write packet. */
3931 OSPF_ISM_WRITE_ON(oi
->ospf
);
3933 /* Add Link State Request Retransmission Timer. */
3934 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3937 /* Send Link State Update with an LSA. */
3938 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3941 struct list
*update
;
3943 update
= list_new();
3945 listnode_add(update
, lsa
);
3947 /*ospf instance is going down, send self originated
3948 * MAXAGE LSA update to neighbors to remove from LSDB */
3949 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3950 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3952 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3954 list_delete(&update
);
3957 /* Determine size for packet. Must be at least big enough to accomodate next
3958 * LSA on list, which may be bigger than MTU size.
3960 * Return pointer to new ospf_packet
3961 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3962 * on packet sizes (in which case offending LSA is deleted from update list)
3964 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3965 struct ospf_interface
*oi
)
3967 struct ospf_lsa
*lsa
;
3968 struct listnode
*ln
;
3970 static char warned
= 0;
3972 lsa
= listgetdata((ln
= listhead(update
)));
3975 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3976 > ospf_packet_max(oi
)) {
3980 "ospf_ls_upd_packet_new: oversized LSA encountered!will need to fragment. Not optimal. Try divide up your network with areas. Use 'debug ospf packet send' to see details, or look at 'show ip ospf database ..'");
3984 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3986 "ospf_ls_upd_packet_new: oversized LSA id:%pI4, %d bytes originated by %pI4, will be fragmented!",
3988 ntohs(lsa
->data
->length
),
3989 &lsa
->data
->adv_router
);
3992 * Allocate just enough to fit this LSA only, to avoid including
3994 * LSAs in fragmented LSA Updates.
3996 size
= ntohs(lsa
->data
->length
)
3997 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
3998 + OSPF_LS_UPD_MIN_SIZE
;
4000 size
= oi
->ifp
->mtu
;
4002 if (size
> OSPF_MAX_PACKET_SIZE
) {
4003 flog_warn(EC_OSPF_LARGE_LSA
,
4004 "ospf_ls_upd_packet_new: oversized LSA id:%pI4 too big, %d bytes, packet size %ld, dropping it completely. OSPF routing is broken!",
4005 &lsa
->data
->id
, ntohs(lsa
->data
->length
),
4007 list_delete_node(update
, ln
);
4011 /* IP header is built up separately by ospf_write(). This means, that we
4013 * reduce the "affordable" size just calculated by length of an IP
4015 * This makes sure, that even if we manage to fill the payload with LSA
4017 * completely, the final packet (our data plus IP header) still fits
4019 * outgoing interface MTU. This correction isn't really meaningful for
4021 * oversized LSA, but for consistency the correction is done for both
4024 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
4026 return ospf_packet_new(size
- sizeof(struct ip
));
4029 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
4030 struct list
*update
, struct in_addr addr
,
4033 struct ospf_packet
*op
;
4034 uint16_t length
= OSPF_HEADER_SIZE
;
4036 if (IS_DEBUG_OSPF_EVENT
)
4037 zlog_debug("listcount = %d, [%s]dst %pI4", listcount(update
),
4038 IF_NAME(oi
), &addr
);
4040 /* Check that we have really something to process */
4041 if (listcount(update
) == 0)
4044 op
= ospf_ls_upd_packet_new(update
, oi
);
4046 /* Prepare OSPF common header. */
4047 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4049 /* Prepare OSPF Link State Update body.
4050 * Includes Type-7 translation.
4052 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4054 /* Fill OSPF header. */
4055 ospf_fill_header(oi
, op
->s
, length
);
4057 /* Set packet length. */
4058 op
->length
= length
;
4060 /* Decide destination address. */
4061 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4062 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4064 op
->dst
.s_addr
= addr
.s_addr
;
4066 /* Add packet to the interface output queue. */
4067 ospf_packet_add(oi
, op
);
4068 /* Call ospf_write() right away to send ospf packets to neighbors */
4069 if (send_lsupd_now
) {
4070 struct thread os_packet_thd
;
4072 os_packet_thd
.arg
= (void *)oi
->ospf
;
4073 if (oi
->on_write_q
== 0) {
4074 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4077 ospf_write(&os_packet_thd
);
4079 * We are fake calling ospf_write with a fake
4080 * thread. Imagine that we have oi_a already
4081 * enqueued and we have turned on the write
4083 * Now this function calls this for oi_b
4084 * so the on_write_q has oi_a and oi_b on
4085 * it, ospf_write runs and clears the packets
4086 * for both oi_a and oi_b. Removing them from
4087 * the on_write_q. After this thread of execution
4088 * finishes we will execute the t_write thread
4089 * with nothing in the on_write_q causing an
4090 * assert. So just make sure that the t_write
4091 * is actually turned off.
4093 if (list_isempty(oi
->ospf
->oi_write_q
))
4094 OSPF_TIMER_OFF(oi
->ospf
->t_write
);
4096 /* Hook thread to write packet. */
4097 OSPF_ISM_WRITE_ON(oi
->ospf
);
4101 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
4103 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4104 struct route_node
*rn
;
4105 struct route_node
*rnext
;
4106 struct list
*update
;
4109 oi
->t_ls_upd_event
= NULL
;
4111 if (IS_DEBUG_OSPF_EVENT
)
4112 zlog_debug("ospf_ls_upd_send_queue start");
4114 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4115 rnext
= route_next(rn
);
4117 if (rn
->info
== NULL
)
4120 update
= (struct list
*)rn
->info
;
4122 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4124 /* list might not be empty. */
4125 if (listcount(update
) == 0) {
4126 list_delete((struct list
**)&rn
->info
);
4127 route_unlock_node(rn
);
4133 if (IS_DEBUG_OSPF_EVENT
)
4135 "ospf_ls_upd_send_queue: update lists not cleared, %d nodes to try again, raising new event",
4137 oi
->t_ls_upd_event
= NULL
;
4138 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4139 &oi
->t_ls_upd_event
);
4142 if (IS_DEBUG_OSPF_EVENT
)
4143 zlog_debug("ospf_ls_upd_send_queue stop");
4148 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4151 struct ospf_interface
*oi
;
4152 struct ospf_lsa
*lsa
;
4153 struct prefix_ipv4 p
;
4154 struct route_node
*rn
;
4155 struct listnode
*node
;
4160 p
.prefixlen
= IPV4_MAX_BITLEN
;
4162 /* Decide destination address. */
4163 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4164 p
.prefix
= oi
->vl_data
->peer_addr
;
4165 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4166 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4167 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4168 p
.prefix
= nbr
->address
.u
.prefix4
;
4169 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4170 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4171 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4172 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4174 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4176 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4177 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4180 "* LS-Update is directly sent on NBMA network.");
4181 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4182 flog_warn(EC_OSPF_PACKET
,
4183 "* LS-Update is sent to myself.");
4186 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4188 if (rn
->info
== NULL
)
4189 rn
->info
= list_new();
4191 route_unlock_node(rn
);
4193 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4194 listnode_add(rn
->info
,
4195 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4196 if (send_lsupd_now
) {
4197 struct list
*send_update_list
;
4198 struct route_node
*rnext
;
4200 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4201 rnext
= route_next(rn
);
4203 if (rn
->info
== NULL
)
4206 send_update_list
= (struct list
*)rn
->info
;
4208 ospf_ls_upd_queue_send(oi
, send_update_list
,
4209 rn
->p
.u
.prefix4
, 1);
4212 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4213 &oi
->t_ls_upd_event
);
4216 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4219 struct ospf_packet
*op
;
4220 uint16_t length
= OSPF_HEADER_SIZE
;
4222 op
= ospf_packet_new(oi
->ifp
->mtu
);
4224 /* Prepare OSPF common header. */
4225 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4227 /* Prepare OSPF Link State Acknowledgment body. */
4228 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4230 /* Fill OSPF header. */
4231 ospf_fill_header(oi
, op
->s
, length
);
4233 /* Set packet length. */
4234 op
->length
= length
;
4236 /* Decide destination address. */
4237 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4238 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4240 op
->dst
.s_addr
= dst
.s_addr
;
4242 /* Add packet to the interface output queue. */
4243 ospf_packet_add(oi
, op
);
4245 /* Hook thread to write packet. */
4246 OSPF_ISM_WRITE_ON(oi
->ospf
);
4249 static int ospf_ls_ack_send_event(struct thread
*thread
)
4251 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4253 oi
->t_ls_ack_direct
= NULL
;
4255 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4256 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4257 oi
->ls_ack_direct
.dst
);
4262 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4264 struct ospf_interface
*oi
= nbr
->oi
;
4266 if (IS_GRACE_LSA(lsa
)) {
4267 if (IS_DEBUG_OSPF_GR_HELPER
)
4268 zlog_debug("%s, Sending GRACE ACK to Restarter.",
4269 __PRETTY_FUNCTION__
);
4272 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4273 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4275 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4277 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4278 &oi
->t_ls_ack_direct
);
4281 /* Send Link State Acknowledgment delayed. */
4282 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4286 /* Decide destination address. */
4287 /* RFC2328 Section 13.5 On non-broadcast
4288 networks, delayed Link State Acknowledgment packets must be
4289 unicast separately over each adjacency (i.e., neighbor whose
4290 state is >= Exchange). */
4291 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4292 struct ospf_neighbor
*nbr
;
4293 struct route_node
*rn
;
4295 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4296 if ((nbr
= rn
->info
) != NULL
)
4297 if (nbr
!= oi
->nbr_self
4298 && nbr
->state
>= NSM_Exchange
)
4299 while (listcount(oi
->ls_ack
))
4300 ospf_ls_ack_send_list(
4302 nbr
->address
.u
.prefix4
);
4305 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4306 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4307 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4308 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4309 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4310 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4311 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4312 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4314 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4316 while (listcount(oi
->ls_ack
))
4317 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4321 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4322 * address. As a result, the kernel does not need to learn the interface
4323 * MAC of the OSPF neighbor. However, in our world, this will delay
4324 * convergence. Take the case when due to a link flap, all routes now
4325 * want to use an interface which was deemed to be costlier prior to this
4326 * event. For routes that will be installed, the missing MAC will have
4327 * punt-to-CPU set on them. This may overload the CPU control path that
4328 * can be avoided if the MAC was known apriori.
4330 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4332 if (!nbr
|| !nbr
->oi
->ospf
->proactive_arp
)
4335 ospf_zebra_send_arp(nbr
->oi
->ifp
, &nbr
->address
);