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.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 (OSPF_GR_IS_ACTIVE_HELPER(nbr
)) {
1085 /* As per the GR Conformance Test Case 7.2. Section 3
1086 * "Also, if X was the Designated Router on network segment S
1087 * when the helping relationship began, Y maintains X as the
1088 * Designated Router until the helping relationship is
1090 * When I am helper for this neighbor, I should not trigger the
1091 * ISM Events. Also Intentionally not setting the priority and
1092 * other fields so that when the neighbor exits the Grace
1093 * period, it can handle if there is any change before GR and
1095 if (IS_DEBUG_OSPF_GR
)
1097 "%s, Neighbor is under GR Restart, hence ignoring the ISM Events",
1098 __PRETTY_FUNCTION__
);
1103 /* If neighbor itself declares DR and no BDR exists,
1104 cause event BackupSeen */
1105 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1106 if (hello
->bd_router
.s_addr
== INADDR_ANY
1107 && oi
->state
== ISM_Waiting
)
1108 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1110 /* neighbor itself declares BDR. */
1111 if (oi
->state
== ISM_Waiting
1112 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
))
1113 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1115 /* had not previously. */
1116 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1117 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1118 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1119 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->d_router
)))
1120 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1122 /* had not previously. */
1123 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1124 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1125 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1126 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
)))
1127 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1129 /* Neighbor priority check. */
1130 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1131 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1133 /* Set neighbor information. */
1134 nbr
->priority
= hello
->priority
;
1135 nbr
->d_router
= hello
->d_router
;
1136 nbr
->bd_router
= hello
->bd_router
;
1139 /* Save DD flags/options/Seqnum received. */
1140 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1141 struct ospf_db_desc
*dd
)
1143 nbr
->last_recv
.flags
= dd
->flags
;
1144 nbr
->last_recv
.options
= dd
->options
;
1145 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1148 /* Process rest of DD packet. */
1149 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1150 struct ospf_neighbor
*nbr
,
1151 struct ospf_db_desc
*dd
, uint16_t size
)
1153 struct ospf_lsa
*new, *find
;
1154 struct lsa_header
*lsah
;
1156 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1157 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1158 size
-= OSPF_LSA_HEADER_SIZE
) {
1159 lsah
= (struct lsa_header
*)stream_pnt(s
);
1160 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1162 /* Unknown LS type. */
1163 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1164 flog_warn(EC_OSPF_PACKET
,
1165 "Packet [DD:RECV]: Unknown LS type %d.",
1167 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1171 if (IS_OPAQUE_LSA(lsah
->type
)
1172 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1173 flog_warn(EC_OSPF_PACKET
,
1174 "LSA[Type%d:%pI4]: Opaque capability mismatch?",
1175 lsah
->type
, &lsah
->id
);
1176 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1180 switch (lsah
->type
) {
1181 case OSPF_AS_EXTERNAL_LSA
:
1182 case OSPF_OPAQUE_AS_LSA
:
1183 /* Check for stub area. Reject if AS-External from stub
1185 allow if from NSSA. */
1186 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1189 "Packet [DD:RECV]: LSA[Type%d:%pI4] from %s area.",
1190 lsah
->type
, &lsah
->id
,
1191 (oi
->area
->external_routing
1195 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1196 NSM_SeqNumberMismatch
);
1204 /* Create LS-request object. */
1205 new = ospf_ls_request_new(lsah
);
1207 /* Lookup received LSA, then add LS request list. */
1208 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1210 /* ospf_lsa_more_recent is fine with NULL pointers */
1211 switch (ospf_lsa_more_recent(find
, new)) {
1213 /* Neighbour has a more recent LSA, we must request it
1215 ospf_ls_request_add(nbr
, new);
1218 /* If we have a copy of this LSA, it's either less
1220 * and we're requesting it from neighbour (the case
1222 * it's as recent and we both have same copy (this
1225 * In neither of these two cases is there any point in
1226 * describing our copy of the LSA to the neighbour in a
1227 * DB-Summary packet, if we're still intending to do so.
1229 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1230 * backward compatible optimisation to OSPF DB Exchange
1232 * DB Description process implemented here.
1235 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1236 ospf_lsa_discard(new);
1239 /* We have the more recent copy, nothing specific to do:
1240 * - no need to request neighbours stale copy
1241 * - must leave DB summary list copy alone
1243 if (IS_DEBUG_OSPF_EVENT
)
1245 "Packet [DD:RECV]: LSA received Type %d, ID %pI4 is not recent.",
1246 lsah
->type
, &lsah
->id
);
1247 ospf_lsa_discard(new);
1252 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1255 /* Both sides have no More, then we're done with Exchange */
1256 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1257 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1259 ospf_db_desc_send(nbr
);
1263 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1265 /* Send DD packet in reply.
1267 * Must be done to acknowledge the Master's DD, regardless of
1268 * whether we have more LSAs ourselves to describe.
1270 * This function will clear the 'More' bit, if after this DD
1271 * we have no more LSAs to describe to the master..
1273 ospf_db_desc_send(nbr
);
1275 /* Slave can raise ExchangeDone now, if master is also done */
1276 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1277 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1280 /* Save received neighbor values from DD. */
1281 ospf_db_desc_save_current(nbr
, dd
);
1284 ospf_ls_req_send(nbr
);
1287 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1288 struct ospf_neighbor
*nbr
)
1290 /* Is DD duplicated? */
1291 if (dd
->options
== nbr
->last_recv
.options
1292 && dd
->flags
== nbr
->last_recv
.flags
1293 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1299 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1300 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1301 struct stream
*s
, struct ospf_interface
*oi
,
1304 struct ospf_db_desc
*dd
;
1305 struct ospf_neighbor
*nbr
;
1307 /* Increment statistics. */
1310 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1312 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1314 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %pI4",
1320 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1321 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1324 "Packet[DD]: Neighbor %pI4 MTU %u is larger than [%s]'s MTU %u",
1325 &nbr
->router_id
, ntohs(dd
->mtu
), IF_NAME(oi
),
1331 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1333 * required. In fact at least JunOS sends DD packets with P bit clear.
1334 * Until proper solution is developped, this hack should help.
1336 * Update: According to the RFCs, N bit is specified /only/ for Hello
1337 * options, unfortunately its use in DD options is not specified. Hence
1339 * implementations follow E-bit semantics and set it in DD options, and
1341 * treat it as unspecified and hence follow the directive "default for
1342 * options is clear", ie unset.
1344 * Reset the flag, as ospfd follows E-bit semantics.
1346 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1347 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1348 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1349 if (IS_DEBUG_OSPF_EVENT
)
1351 "Packet[DD]: Neighbour %pI4: Has NSSA capability, sends with N bit clear in DD options",
1353 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1356 #ifdef REJECT_IF_TBIT_ON
1357 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1359 * In Hello protocol, optional capability must have checked
1360 * to prevent this T-bit enabled router be my neighbor.
1362 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %pI4: T-bit on?",
1366 #endif /* REJECT_IF_TBIT_ON */
1368 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1369 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1371 * This node is not configured to handle O-bit, for now.
1372 * Clear it to ignore unsupported capability proposed by
1375 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1378 /* Add event to thread. */
1379 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1381 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1383 "%s:Packet[DD]: Neighbor %pI4 state is %s, seq_num:0x%x, local:0x%x",
1384 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
1386 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
1387 ntohl(dd
->dd_seqnum
), nbr
->dd_seqnum
);
1389 /* Process DD packet by neighbor status. */
1390 switch (nbr
->state
) {
1394 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1396 "Packet[DD]: Neighbor %pI4 state is %s, packet discarded.",
1398 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1402 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1403 /* If the new state is ExStart, the processing of the current
1404 packet should then continue in this new state by falling
1405 through to case ExStart below. */
1406 if (nbr
->state
!= NSM_ExStart
)
1411 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1412 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1413 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1415 /* We're Slave---obey */
1416 if (CHECK_FLAG(oi
->ospf
->config
,
1417 OSPF_LOG_ADJACENCY_DETAIL
))
1419 "Packet[DD]: Neighbor %pI4 Negotiation done (Slave).",
1422 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1425 UNSET_FLAG(nbr
->dd_flags
,
1426 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1428 /* We're Master, ignore the initial DBD from
1430 if (CHECK_FLAG(oi
->ospf
->config
,
1431 OSPF_LOG_ADJACENCY_DETAIL
))
1433 "Packet[DD]: Neighbor %pI4: Initial DBD from Slave, ignoring.",
1438 /* Ack from the Slave */
1439 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1440 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1441 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1444 "Packet[DD]: Neighbor %pI4 Negotiation done (Master).",
1446 /* Reset I, leaving MS */
1447 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1449 flog_warn(EC_OSPF_PACKET
,
1450 "Packet[DD]: Neighbor %pI4 Negotiation fails.",
1455 /* This is where the real Options are saved */
1456 nbr
->options
= dd
->options
;
1458 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1459 if (IS_DEBUG_OSPF_EVENT
)
1461 "Neighbor[%pI4] is %sOpaque-capable.",
1463 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1467 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1468 && IPV4_ADDR_SAME(&DR(oi
),
1469 &nbr
->address
.u
.prefix4
)) {
1472 "DR-neighbor[%pI4] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1474 /* This situation is undesirable, but not a real
1479 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1481 /* continue processing rest of packet. */
1482 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1485 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1486 if (IS_SET_DD_MS(nbr
->dd_flags
))
1487 /* Master: discard duplicated DD packet. */
1489 "Packet[DD] (Master): Neighbor %pI4 packet duplicated.",
1492 /* Slave: cause to retransmit the last Database
1496 "Packet[DD] [Slave]: Neighbor %pI4 packet duplicated.",
1498 ospf_db_desc_resend(nbr
);
1503 /* Otherwise DD packet should be checked. */
1504 /* Check Master/Slave bit mismatch */
1505 if (IS_SET_DD_MS(dd
->flags
)
1506 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1507 flog_warn(EC_OSPF_PACKET
,
1508 "Packet[DD]: Neighbor %pI4 MS-bit mismatch.",
1510 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1511 if (IS_DEBUG_OSPF_EVENT
)
1513 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1514 dd
->flags
, nbr
->dd_flags
);
1518 /* Check initialize bit is set. */
1519 if (IS_SET_DD_I(dd
->flags
)) {
1520 zlog_info("Packet[DD]: Neighbor %pI4 I-bit set.",
1522 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1526 /* Check DD Options. */
1527 if (dd
->options
!= nbr
->options
) {
1528 flog_warn(EC_OSPF_PACKET
,
1529 "Packet[DD]: Neighbor %pI4 options mismatch.",
1531 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1535 /* Check DD sequence number. */
1536 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1537 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1538 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1539 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1542 "Packet[DD]: Neighbor %pI4 sequence number mismatch.",
1544 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1548 /* Continue processing rest of packet. */
1549 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1553 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1554 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1555 /* Master should discard duplicate DD packet. */
1557 "Packet[DD]: Neighbor %pI4 duplicated, packet discarded.",
1561 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1562 < nbr
->v_inactivity
* 1000000LL) {
1563 /* In states Loading and Full the slave
1565 its last Database Description packet
1567 duplicate Database Description
1569 from the master. For this reason the
1571 wait RouterDeadInterval seconds
1573 last Database Description packet.
1575 Database Description packet from the
1577 this interval will generate a
1579 neighbor event. RFC2328 Section 10.8
1581 ospf_db_desc_resend(nbr
);
1587 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1590 flog_warn(EC_OSPF_PACKET
,
1591 "Packet[DD]: Neighbor %pI4 NSM illegal status %u.",
1592 &nbr
->router_id
, nbr
->state
);
1597 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1599 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1600 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1601 struct stream
*s
, struct ospf_interface
*oi
,
1604 struct ospf_neighbor
*nbr
;
1606 struct in_addr ls_id
;
1607 struct in_addr adv_router
;
1608 struct ospf_lsa
*find
;
1609 struct list
*ls_upd
;
1610 unsigned int length
;
1612 /* Increment statistics. */
1615 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1617 flog_warn(EC_OSPF_PACKET
,
1618 "Link State Request: Unknown Neighbor %pI4",
1623 /* Add event to thread. */
1624 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1626 /* Neighbor State should be Exchange or later. */
1627 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1628 && nbr
->state
!= NSM_Full
) {
1631 "Link State Request received from %pI4: Neighbor state is %s, packet discarded.",
1633 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1637 /* Send Link State Update for ALL requested LSAs. */
1638 ls_upd
= list_new();
1639 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1641 while (size
>= OSPF_LSA_KEY_SIZE
) {
1642 /* Get one slice of Link State Request. */
1643 ls_type
= stream_getl(s
);
1644 ls_id
.s_addr
= stream_get_ipv4(s
);
1645 adv_router
.s_addr
= stream_get_ipv4(s
);
1647 /* Verify LSA type. */
1648 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1649 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1650 list_delete(&ls_upd
);
1654 /* Search proper LSA in LSDB. */
1655 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1658 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1659 list_delete(&ls_upd
);
1663 /* Packet overflows MTU size, send immediately. */
1664 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1665 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1666 ospf_ls_upd_send(nbr
, ls_upd
,
1667 OSPF_SEND_PACKET_DIRECT
, 0);
1669 ospf_ls_upd_send(nbr
, ls_upd
,
1670 OSPF_SEND_PACKET_INDIRECT
, 0);
1672 /* Only remove list contents. Keep ls_upd. */
1673 list_delete_all_node(ls_upd
);
1675 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1678 /* Append LSA to update list. */
1679 listnode_add(ls_upd
, find
);
1680 length
+= ntohs(find
->data
->length
);
1682 size
-= OSPF_LSA_KEY_SIZE
;
1685 /* Send rest of Link State Update. */
1686 if (listcount(ls_upd
) > 0) {
1687 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1688 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1691 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1694 list_delete(&ls_upd
);
1696 list_delete(&ls_upd
);
1699 /* Get the list of LSAs from Link State Update packet.
1700 And process some validation -- RFC2328 Section 13. (1)-(2). */
1701 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1703 struct ospf_interface
*oi
, size_t size
)
1705 uint16_t count
, sum
;
1707 struct lsa_header
*lsah
;
1708 struct ospf_lsa
*lsa
;
1713 count
= stream_getl(s
);
1714 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1716 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1717 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1718 lsah
= (struct lsa_header
*)stream_pnt(s
);
1719 length
= ntohs(lsah
->length
);
1721 if (length
> size
) {
1724 "Link State Update: LSA length exceeds packet size.");
1728 /* Validate the LSA's LS checksum. */
1729 sum
= lsah
->checksum
;
1730 if (!ospf_lsa_checksum_valid(lsah
)) {
1731 /* (bug #685) more details in a one-line message make it
1733 * to identify problem source on the one hand and to
1735 * chance to compress repeated messages in syslog on the
1739 "Link State Update: LSA checksum error %x/%x, ID=%pI4 from: nbr %pI4, router ID %pI4, adv router %pI4",
1740 sum
, lsah
->checksum
, &lsah
->id
,
1741 &nbr
->src
, &nbr
->router_id
,
1746 /* Examine the LSA's LS type. */
1747 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1748 flog_warn(EC_OSPF_PACKET
,
1749 "Link State Update: Unknown LS type %d",
1755 * What if the received LSA's age is greater than MaxAge?
1756 * Treat it as a MaxAge case -- endo.
1758 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1759 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1761 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1762 #ifdef STRICT_OBIT_USAGE_CHECK
1763 if ((IS_OPAQUE_LSA(lsah
->type
)
1764 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1765 || (!IS_OPAQUE_LSA(lsah
->type
)
1766 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1768 * This neighbor must know the exact usage of
1770 * the bit will be set in Type-9,10,11 LSAs
1773 flog_warn(EC_OSPF_PACKET
,
1774 "LSA[Type%d:%pI4]: O-bit abuse?",
1775 lsah
->type
, &lsah
->id
);
1778 #endif /* STRICT_OBIT_USAGE_CHECK */
1780 /* Do not take in AS External Opaque-LSAs if we are a
1782 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1783 && nbr
->oi
->area
->external_routing
1784 != OSPF_AREA_DEFAULT
) {
1785 if (IS_DEBUG_OSPF_EVENT
)
1787 "LSA[Type%d:%pI4]: We are a stub, don't take this LSA.",
1792 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1793 flog_warn(EC_OSPF_PACKET
,
1794 "LSA[Type%d:%pI4]: Opaque capability mismatch?",
1795 lsah
->type
, &lsah
->id
);
1799 /* Create OSPF LSA instance. */
1800 lsa
= ospf_lsa_new_and_data(length
);
1802 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1803 /* We may wish to put some error checking if type NSSA comes in
1804 and area not in NSSA mode */
1805 switch (lsah
->type
) {
1806 case OSPF_AS_EXTERNAL_LSA
:
1807 case OSPF_OPAQUE_AS_LSA
:
1810 case OSPF_OPAQUE_LINK_LSA
:
1811 lsa
->oi
= oi
; /* Remember incoming interface for
1812 flooding control. */
1815 lsa
->area
= oi
->area
;
1819 memcpy(lsa
->data
, lsah
, length
);
1821 if (IS_DEBUG_OSPF_EVENT
)
1823 "LSA[Type%d:%pI4]: %p new LSA created with Link State Update",
1824 lsa
->data
->type
, &lsa
->data
->id
,
1826 listnode_add(lsas
, lsa
);
1832 /* Cleanup Update list. */
1833 static void ospf_upd_list_clean(struct list
*lsas
)
1835 struct listnode
*node
, *nnode
;
1836 struct ospf_lsa
*lsa
;
1838 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1839 ospf_lsa_discard(lsa
);
1844 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1845 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1846 struct ospf_header
*ospfh
, struct stream
*s
,
1847 struct ospf_interface
*oi
, uint16_t size
)
1849 struct ospf_neighbor
*nbr
;
1851 struct listnode
*node
, *nnode
;
1852 struct ospf_lsa
*lsa
= NULL
;
1853 /* unsigned long ls_req_found = 0; */
1855 /* Dis-assemble the stream, update each entry, re-encapsulate for
1858 /* Increment statistics. */
1861 /* Check neighbor. */
1862 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1864 flog_warn(EC_OSPF_PACKET
,
1865 "Link State Update: Unknown Neighbor %pI4 on int: %s",
1866 &ospfh
->router_id
, IF_NAME(oi
));
1870 /* Add event to thread. */
1871 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1873 /* Check neighbor state. */
1874 if (nbr
->state
< NSM_Exchange
) {
1875 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1877 "Link State Update: Neighbor[%pI4] state %s is less than Exchange",
1879 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1884 /* Get list of LSAs from Link State Update packet. - Also performs
1885 * Stages 1 (validate LSA checksum) and 2 (check for LSA consistent
1886 * type) of section 13.
1888 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1892 #define DISCARD_LSA(L, N) \
1894 if (IS_DEBUG_OSPF_EVENT) \
1896 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1898 N, (void *)lsa, (int)lsa->data->type); \
1899 ospf_lsa_discard(L); \
1903 /* Process each LSA received in the one packet.
1905 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1906 * text below are from the steps in RFC 2328, Section 13.
1908 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1909 struct ospf_lsa
*ls_ret
, *current
;
1912 if (IS_DEBUG_OSPF(lsa
, LSA
))
1913 zlog_debug("LSA Type-%d from %pI4, ID: %pI4, ADV: %pI4",
1914 lsa
->data
->type
, &ospfh
->router_id
,
1915 &lsa
->data
->id
, &lsa
->data
->adv_router
);
1917 listnode_delete(lsas
,
1918 lsa
); /* We don't need it in list anymore */
1920 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1923 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1925 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1928 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1931 /* Do take in Type-7's if we are an NSSA */
1933 /* If we are also an ABR, later translate them to a Type-5
1936 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1937 translate them to a separate Type-5 packet. */
1939 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1940 /* Reject from STUB or NSSA */
1941 if (nbr
->oi
->area
->external_routing
1942 != OSPF_AREA_DEFAULT
) {
1943 if (IS_DEBUG_OSPF_NSSA
)
1945 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1946 DISCARD_LSA(lsa
, 1);
1949 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1950 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1951 if (IS_DEBUG_OSPF_NSSA
)
1953 "Incoming NSSA LSA Discarded: Not NSSA Area");
1954 DISCARD_LSA(lsa
, 2);
1957 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1958 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1959 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1960 &lsa
->data
->adv_router
)) {
1962 EC_OSPF_ROUTER_LSA_MISMATCH
,
1963 "Incoming Router-LSA from %pI4 with Adv-ID[%pI4] != LS-ID[%pI4]",
1964 &ospfh
->router_id
, &lsa
->data
->id
,
1965 &lsa
->data
->adv_router
);
1967 EC_OSPF_DOMAIN_CORRUPT
,
1968 "OSPF domain compromised by attack or corruption. Verify correct operation of -ALL- OSPF routers.");
1969 DISCARD_LSA(lsa
, 0);
1972 /* Find the LSA in the current database. */
1974 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1976 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1978 no instance of the LSA in the router's link state database,
1979 and none of router's neighbors are in states Exchange or
1981 then take the following actions: */
1983 if (IS_LSA_MAXAGE(lsa
) && !current
1984 && ospf_check_nbr_status(oi
->ospf
)) {
1985 /* (4a) Response Link State Acknowledgment. */
1986 ospf_ls_ack_send(nbr
, lsa
);
1988 /* (4b) Discard LSA. */
1989 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1991 "Link State Update[%s]: LS age is equal to MaxAge.",
1994 DISCARD_LSA(lsa
, 3);
1997 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1998 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1999 &oi
->ospf
->router_id
)) {
2001 * Even if initial flushing seems to be completed, there
2003 * be a case that self-originated LSA with MaxAge still
2005 * in the routing domain.
2006 * Just send an LSAck message to cease retransmission.
2008 if (IS_LSA_MAXAGE(lsa
)) {
2009 zlog_info("LSA[%s]: Boomerang effect?",
2011 ospf_ls_ack_send(nbr
, lsa
);
2012 ospf_lsa_discard(lsa
);
2014 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2015 ospf_opaque_lsa_refresh_schedule(
2021 * If an instance of self-originated Opaque-LSA is not
2023 * in the LSDB, there are some possible cases here.
2025 * 1) This node lost opaque-capability after restart.
2026 * 2) Else, a part of opaque-type is no more supported.
2027 * 3) Else, a part of opaque-id is no more supported.
2029 * Anyway, it is still this node's responsibility to
2031 * Otherwise, the LSA instance remains in the routing
2033 * until its age reaches to MaxAge.
2035 /* XXX: We should deal with this for *ALL* LSAs, not
2037 if (current
== NULL
) {
2038 if (IS_DEBUG_OSPF_EVENT
)
2040 "LSA[%s]: Previously originated Opaque-LSA,not found in the LSDB.",
2043 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2045 ospf_ls_ack_send(nbr
, lsa
);
2047 if (!ospf
->gr_info
.restart_in_progress
) {
2048 ospf_opaque_self_originated_lsa_received(
2055 /* It might be happen that received LSA is self-originated
2057 * router ID is changed. So, we should check if LSA is a
2059 * Link State ID is one of the router's own IP interface
2060 * addresses but whose
2061 * Advertising Router is not equal to the router's own Router ID
2062 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2066 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2067 struct listnode
*oinode
, *oinnode
;
2068 struct ospf_interface
*out_if
;
2071 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2076 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2078 && (!(IPV4_ADDR_SAME(
2079 &oi
->ospf
->router_id
,
2080 &lsa
->data
->adv_router
)))) {
2081 if (out_if
->network_lsa_self
) {
2082 ospf_lsa_flush_area(
2084 if (IS_DEBUG_OSPF_EVENT
)
2086 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2090 ospf_lsa_discard(lsa
);
2100 /* (5) Find the instance of this LSA that is currently contained
2101 in the router's link state database. If there is no
2102 database copy, or the received LSA is more recent than
2103 the database copy the following steps must be performed.
2104 (The sub steps from RFC 2328 section 13 step (5) will be
2109 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2111 if (current
&& (IS_LSA_MAX_SEQ(current
))
2112 && (IS_LSA_MAX_SEQ(lsa
)) && !IS_LSA_MAXAGE(lsa
)) {
2114 "Link State Update[%s]: has Max Seq and higher checksum but not MaxAge. Dropping it",
2117 DISCARD_LSA(lsa
, 4);
2120 /* Actual flooding procedure. */
2121 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2122 < 0) /* Trap NSSA later. */
2123 DISCARD_LSA(lsa
, 5);
2127 /* (6) Else, If there is an instance of the LSA on the sending
2128 neighbor's Link state request list, an error has occurred in
2129 the Database Exchange process. In this case, restart the
2130 Database Exchange process by generating the neighbor event
2131 BadLSReq for the sending neighbor and stop processing the
2132 Link State Update packet. */
2134 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2135 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2138 "LSA[%s] instance exists on Link state request list",
2141 /* Clean list of LSAs. */
2142 ospf_upd_list_clean(lsas
);
2143 /* this lsa is not on lsas list already. */
2144 ospf_lsa_discard(lsa
);
2148 /* If the received LSA is the same instance as the database copy
2149 (i.e., neither one is more recent) the following two steps
2150 should be performed: */
2153 /* If the LSA is listed in the Link state retransmission
2155 for the receiving adjacency, the router itself is
2157 an acknowledgment for this LSA. The router should
2159 received LSA as an acknowledgment by removing the LSA
2161 the Link state retransmission list. This is termed
2163 "implied acknowledgment". */
2165 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2167 if (ls_ret
!= NULL
) {
2168 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2170 /* Delayed acknowledgment sent if advertisement
2172 from Designated Router, otherwise do nothing.
2174 if (oi
->state
== ISM_Backup
)
2178 ospf_lsa_lock(lsa
));
2180 DISCARD_LSA(lsa
, 6);
2182 /* Acknowledge the receipt of the LSA by sending a
2183 Link State Acknowledgment packet back out the
2187 ospf_ls_ack_send(nbr
, lsa
);
2188 DISCARD_LSA(lsa
, 7);
2192 /* The database copy is more recent. If the database copy
2193 has LS age equal to MaxAge and LS sequence number equal to
2194 MaxSequenceNumber, simply discard the received LSA without
2195 acknowledging it. (In this case, the LSA's LS sequence number
2197 wrapping, and the MaxSequenceNumber LSA must be completely
2198 flushed before any new LSA instance can be introduced). */
2200 else if (ret
> 0) /* Database copy is more recent */
2202 if (IS_LSA_MAXAGE(current
)
2203 && current
->data
->ls_seqnum
2204 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2205 DISCARD_LSA(lsa
, 8);
2207 /* Otherwise, as long as the database copy has not been
2209 Link State Update within the last MinLSArrival
2211 database copy back to the sending neighbor,
2213 a Link State Update Packet. The Link State Update
2215 be sent directly to the neighbor. In so doing, do not
2217 database copy of the LSA on the neighbor's link state
2218 retransmission list, and do not acknowledge the
2220 recent) LSA instance. */
2222 if (monotime_since(¤t
->tv_orig
, NULL
)
2223 >= ospf
->min_ls_arrival
* 1000LL)
2224 /* Trap NSSA type later.*/
2225 ospf_ls_upd_send_lsa(
2227 OSPF_SEND_PACKET_DIRECT
);
2228 DISCARD_LSA(lsa
, 9);
2234 assert(listcount(lsas
) == 0);
2237 if (ospf
->gr_info
.restart_in_progress
)
2238 ospf_gr_check_lsdb_consistency(oi
->ospf
, oi
->area
);
2241 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2242 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2243 struct stream
*s
, struct ospf_interface
*oi
,
2246 struct ospf_neighbor
*nbr
;
2248 /* increment statistics. */
2251 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2253 flog_warn(EC_OSPF_PACKET
,
2254 "Link State Acknowledgment: Unknown Neighbor %pI4",
2259 /* Add event to thread. */
2260 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
2262 if (nbr
->state
< NSM_Exchange
) {
2263 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2265 "Link State Acknowledgment: Neighbor[%pI4] state %s is less than Exchange",
2267 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2272 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2273 struct ospf_lsa
*lsa
, *lsr
;
2275 lsa
= ospf_lsa_new();
2276 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2277 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2279 /* lsah = (struct lsa_header *) stream_pnt (s); */
2280 size
-= OSPF_LSA_HEADER_SIZE
;
2281 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2283 if (lsa
->data
->type
< OSPF_MIN_LSA
2284 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2286 ospf_lsa_discard(lsa
);
2290 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2292 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0) {
2293 ospf_ls_retransmit_delete(nbr
, lsr
);
2294 ospf_check_and_gen_init_seq_lsa(oi
, lsa
);
2298 ospf_lsa_discard(lsa
);
2304 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2305 struct interface
**ifp
,
2306 struct stream
*ibuf
)
2311 ifindex_t ifindex
= 0;
2313 /* Header and data both require alignment. */
2314 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2317 memset(&msgh
, 0, sizeof(struct msghdr
));
2318 msgh
.msg_iov
= &iov
;
2319 msgh
.msg_iovlen
= 1;
2320 msgh
.msg_control
= (caddr_t
)buff
;
2321 msgh
.msg_controllen
= sizeof(buff
);
2323 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, MSG_DONTWAIT
,
2324 OSPF_MAX_PACKET_SIZE
+ 1);
2326 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
)
2327 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2328 safe_strerror(errno
));
2331 if ((unsigned int)ret
< sizeof(struct ip
)) {
2334 "ospf_recv_packet: discarding runt packet of length %d (ip header size is %u)",
2335 ret
, (unsigned int)sizeof(iph
));
2339 /* Note that there should not be alignment problems with this assignment
2340 because this is at the beginning of the stream data buffer. */
2341 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2342 sockopt_iphdrincl_swab_systoh(iph
);
2344 ip_len
= iph
->ip_len
;
2346 #if defined(__FreeBSD__) && (__FreeBSD_version < 1000000)
2348 * Kernel network code touches incoming IP header parameters,
2349 * before protocol specific processing.
2351 * 1) Convert byteorder to host representation.
2352 * --> ip_len, ip_id, ip_off
2354 * 2) Adjust ip_len to strip IP header size!
2355 * --> If user process receives entire IP packet via RAW
2356 * socket, it must consider adding IP header size to
2357 * the "ip_len" field of "ip" structure.
2359 * For more details, see <netinet/ip_input.c>.
2361 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2364 #if defined(__DragonFly__)
2366 * in DragonFly's raw socket, ip_len/ip_off are read
2367 * in network byte order.
2368 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2370 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2373 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2375 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2377 if (ret
!= ip_len
) {
2380 "ospf_recv_packet read length mismatch: ip_len is %d, but recvmsg returned %d",
2385 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2386 zlog_debug("%s: fd %d(%s) on interface %d(%s)", __func__
, fd
,
2387 ospf_get_name(ospf
), ifindex
,
2388 *ifp
? (*ifp
)->name
: "Unknown");
2392 static struct ospf_interface
*
2393 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2394 struct ip
*iph
, struct ospf_header
*ospfh
)
2396 struct ospf_interface
*rcv_oi
;
2397 struct ospf_vl_data
*vl_data
;
2398 struct ospf_area
*vl_area
;
2399 struct listnode
*node
;
2401 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2402 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2405 /* look for local OSPF interface matching the destination
2406 * to determine Area ID. We presume therefore the destination address
2407 * is unique, or at least (for "unnumbered" links), not used in other
2410 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2414 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2416 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2420 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2421 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2422 if (IS_DEBUG_OSPF_EVENT
)
2423 zlog_debug("associating packet with %s",
2424 IF_NAME(vl_data
->vl_oi
));
2425 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2426 if (IS_DEBUG_OSPF_EVENT
)
2428 "This VL is not up yet, sorry");
2432 return vl_data
->vl_oi
;
2436 if (IS_DEBUG_OSPF_EVENT
)
2437 zlog_debug("couldn't find any VL to associate the packet with");
2442 static int ospf_check_area_id(struct ospf_interface
*oi
,
2443 struct ospf_header
*ospfh
)
2445 /* Check match the Area ID of the receiving interface. */
2446 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2452 /* Unbound socket will accept any Raw IP packets if proto is matched.
2453 To prevent it, compare src IP address and i/f address with masking
2454 i/f network mask. */
2455 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2456 struct in_addr ip_src
)
2458 struct in_addr mask
, me
, him
;
2460 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2461 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2464 /* Ignore mask check for max prefix length (32) */
2465 if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
2466 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
)
2469 masklen2ip(oi
->address
->prefixlen
, &mask
);
2471 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2472 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2474 if (IPV4_ADDR_SAME(&me
, &him
))
2480 /* Return 1, if the packet is properly authenticated and checksummed,
2481 0 otherwise. In particular, check that AuType header field is valid and
2482 matches the locally configured AuType, and that D.5 requirements are met. */
2483 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2485 struct crypt_key
*ck
;
2486 uint16_t iface_auth_type
;
2487 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2489 switch (pkt_auth_type
) {
2490 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2491 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2492 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2495 "interface %s: auth-type mismatch, local %s, rcvd Null",
2497 lookup_msg(ospf_auth_type_str
,
2498 iface_auth_type
, NULL
));
2501 if (!ospf_check_sum(ospfh
)) {
2502 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2505 "interface %s: Null auth OK, but checksum error, Router-ID %pI4",
2511 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2512 if (OSPF_AUTH_SIMPLE
2513 != (iface_auth_type
= ospf_auth_type(oi
))) {
2514 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2517 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2519 lookup_msg(ospf_auth_type_str
,
2520 iface_auth_type
, NULL
));
2523 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2524 OSPF_AUTH_SIMPLE_SIZE
)) {
2525 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2526 flog_warn(EC_OSPF_PACKET
,
2527 "interface %s: Simple auth failed",
2531 if (!ospf_check_sum(ospfh
)) {
2532 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2535 "interface %s: Simple auth OK, checksum error, Router-ID %pI4",
2541 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2542 if (OSPF_AUTH_CRYPTOGRAPHIC
2543 != (iface_auth_type
= ospf_auth_type(oi
))) {
2544 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2547 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2549 lookup_msg(ospf_auth_type_str
,
2550 iface_auth_type
, NULL
));
2553 if (ospfh
->checksum
) {
2554 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2557 "interface %s: OSPF header checksum is not 0",
2561 /* only MD5 crypto method can pass ospf_packet_examin() */
2562 if (NULL
== (ck
= listgetdata(
2563 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2564 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2565 /* Condition above uses the last key ID on the list,
2567 different from what ospf_crypt_key_lookup() does. A
2569 !ospf_check_md5_digest(oi
, ospfh
)) {
2570 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2571 flog_warn(EC_OSPF_MD5
,
2572 "interface %s: MD5 auth failed",
2578 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2581 "interface %s: invalid packet auth-type (%02x)",
2582 IF_NAME(oi
), pkt_auth_type
);
2587 static int ospf_check_sum(struct ospf_header
*ospfh
)
2592 /* clear auth_data for checksum. */
2593 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2595 /* keep checksum and clear. */
2596 sum
= ospfh
->checksum
;
2597 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2599 /* calculate checksum. */
2600 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2603 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2611 /* Verify, that given link/TOS records are properly sized/aligned and match
2612 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2613 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2615 const uint16_t num_links
)
2617 unsigned counted_links
= 0, thislinklen
;
2619 while (linkbytes
>= OSPF_ROUTER_LSA_LINK_SIZE
) {
2621 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2622 if (thislinklen
> linkbytes
) {
2623 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2624 zlog_debug("%s: length error in link block #%u",
2625 __func__
, counted_links
);
2628 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2629 linkbytes
-= thislinklen
;
2632 if (counted_links
!= num_links
) {
2633 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2634 zlog_debug("%s: %u link blocks declared, %u present",
2635 __func__
, num_links
, counted_links
);
2641 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2642 minimum length constraint). */
2643 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2644 const uint8_t headeronly
)
2647 struct router_lsa
*rlsa
;
2648 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2649 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2650 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2651 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2652 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2656 switch (lsah
->type
) {
2657 case OSPF_ROUTER_LSA
: {
2659 * RFC2328 A.4.2, LSA header + 4 bytes followed by N>=0
2660 * (12+)-byte link blocks
2662 size_t linkbytes_len
= lsalen
- OSPF_LSA_HEADER_SIZE
2663 - OSPF_ROUTER_LSA_MIN_SIZE
;
2666 * LSA link blocks are variable length but always multiples of
2667 * 4; basic sanity check
2669 if (linkbytes_len
% 4 != 0)
2675 rlsa
= (struct router_lsa
*)lsah
;
2677 ret
= ospf_router_lsa_links_examin(
2678 (struct router_lsa_link
*)rlsa
->link
,
2680 ntohs(rlsa
->links
));
2683 case OSPF_AS_EXTERNAL_LSA
:
2684 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2686 case OSPF_AS_NSSA_LSA
:
2687 /* RFC3101 C, idem */
2688 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2689 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2694 /* Following LSA types are considered OK length-wise as soon as their
2696 * length constraint is met and length of the whole LSA is a multiple of
2698 * (basic LSA header size is already a multiple of 4). */
2699 case OSPF_NETWORK_LSA
:
2700 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2701 case OSPF_SUMMARY_LSA
:
2702 case OSPF_ASBR_SUMMARY_LSA
:
2703 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2705 case OSPF_OPAQUE_LINK_LSA
:
2706 case OSPF_OPAQUE_AREA_LSA
:
2707 case OSPF_OPAQUE_AS_LSA
:
2708 /* RFC5250 A.2, "some number of octets (of application-specific
2709 * data) padded to 32-bit alignment." This is considered
2711 * to 4-byte alignment of all other LSA types, see
2712 * OSPF-ALIGNMENT.txt
2713 * file for the detailed analysis of this passage. */
2714 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2717 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2718 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2722 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2723 zlog_debug("%s: alignment error in %s", __func__
,
2724 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2728 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2729 includes verification of LSA blocks length/alignment and dispatching
2730 of deeper-level checks. */
2732 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2733 size_t length
, const uint8_t headeronly
,
2734 /* When declared_num_lsas is not 0, compare it to the real
2736 and treat the difference as an error. */
2737 const uint32_t declared_num_lsas
)
2739 uint32_t counted_lsas
= 0;
2743 if (length
< OSPF_LSA_HEADER_SIZE
) {
2744 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2746 "%s: undersized (%zu B) trailing (#%u) LSA header",
2747 __func__
, length
, counted_lsas
);
2750 /* save on ntohs() calls here and in the LSA validator */
2751 lsalen
= ntohs(lsah
->length
);
2752 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2753 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2755 "%s: malformed LSA header #%u, declared length is %u B",
2756 __func__
, counted_lsas
, lsalen
);
2760 /* less checks here and in ospf_lsa_examin() */
2761 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2762 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2764 "%s: malformed header-only LSA #%u",
2765 __func__
, counted_lsas
);
2768 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2769 + OSPF_LSA_HEADER_SIZE
);
2770 length
-= OSPF_LSA_HEADER_SIZE
;
2772 /* make sure the input buffer is deep enough before
2774 if (lsalen
> length
) {
2775 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2777 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2778 __func__
, counted_lsas
, lsalen
,
2782 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2783 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2784 zlog_debug("%s: malformed LSA #%u",
2785 __func__
, counted_lsas
);
2788 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2794 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2795 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2797 "%s: #LSAs declared (%u) does not match actual (%u)",
2798 __func__
, declared_num_lsas
, counted_lsas
);
2804 /* Verify a complete OSPF packet for proper sizing/alignment. */
2805 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2806 const unsigned bytesonwire
)
2808 uint16_t bytesdeclared
, bytesauth
;
2810 struct ospf_ls_update
*lsupd
;
2812 /* Length, 1st approximation. */
2813 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2814 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2815 zlog_debug("%s: undersized (%u B) packet", __func__
,
2819 /* Now it is safe to access header fields. Performing length check,
2821 * for possible extra bytes of crypto auth/padding, which are not
2823 * in the OSPF header "length" field. */
2824 if (oh
->version
!= OSPF_VERSION
) {
2825 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2826 zlog_debug("%s: invalid (%u) protocol version",
2827 __func__
, oh
->version
);
2830 bytesdeclared
= ntohs(oh
->length
);
2831 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2834 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2835 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2837 "%s: unsupported crypto auth length (%u B)",
2838 __func__
, oh
->u
.crypt
.auth_data_len
);
2841 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2843 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2844 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2846 "%s: packet length error (%u real, %u+%u declared)",
2847 __func__
, bytesonwire
, bytesdeclared
,
2851 /* Length, 2nd approximation. The type-specific constraint is checked
2852 against declared length, not amount of bytes on wire. */
2853 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2855 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2856 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2857 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2859 lookup_msg(ospf_packet_type_str
, oh
->type
,
2864 case OSPF_MSG_HELLO
:
2865 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2867 by N>=0 router-IDs. */
2868 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2873 case OSPF_MSG_DB_DESC
:
2874 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2876 by N>=0 header-only LSAs. */
2877 ret
= ospf_lsaseq_examin(
2878 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2879 + OSPF_DB_DESC_MIN_SIZE
),
2880 bytesdeclared
- OSPF_HEADER_SIZE
2881 - OSPF_DB_DESC_MIN_SIZE
,
2882 1, /* header-only LSAs */
2885 case OSPF_MSG_LS_REQ
:
2886 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2887 * request blocks. */
2888 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2893 case OSPF_MSG_LS_UPD
:
2894 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2896 by N>=0 full LSAs (with N declared beforehand). */
2897 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2898 + OSPF_HEADER_SIZE
);
2899 ret
= ospf_lsaseq_examin(
2900 (struct lsa_header
*)((caddr_t
)lsupd
2901 + OSPF_LS_UPD_MIN_SIZE
),
2902 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2904 ntohl(lsupd
->num_lsas
) /* 32 bits */
2907 case OSPF_MSG_LS_ACK
:
2908 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2910 ret
= ospf_lsaseq_examin(
2911 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2912 + OSPF_LS_ACK_MIN_SIZE
),
2913 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2914 1, /* header-only LSAs */
2918 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2919 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2923 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2924 zlog_debug("%s: malformed %s packet", __func__
,
2925 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2929 /* OSPF Header verification. */
2930 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2931 struct ip
*iph
, struct ospf_header
*ospfh
)
2933 /* Check Area ID. */
2934 if (!ospf_check_area_id(oi
, ospfh
)) {
2935 flog_warn(EC_OSPF_PACKET
,
2936 "interface %s: ospf_read invalid Area ID %pI4",
2937 IF_NAME(oi
), &ospfh
->area_id
);
2941 /* Check network mask, Silently discarded. */
2942 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2945 "interface %s: ospf_read network address is not same [%pI4]",
2946 IF_NAME(oi
), &iph
->ip_src
);
2950 /* Check authentication. The function handles logging actions, where
2952 if (!ospf_check_auth(oi
, ospfh
))
2958 enum ospf_read_return_enum
{
2963 static enum ospf_read_return_enum
ospf_read_helper(struct ospf
*ospf
)
2966 struct stream
*ibuf
;
2967 struct ospf_interface
*oi
;
2969 struct ospf_header
*ospfh
;
2971 struct connected
*c
;
2972 struct interface
*ifp
= NULL
;
2974 stream_reset(ospf
->ibuf
);
2975 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2977 return OSPF_READ_ERROR
;
2980 * This raw packet is known to be at least as big as its
2981 * IP header. Note that there should not be alignment problems with
2982 * this assignment because this is at the beginning of the
2983 * stream data buffer.
2985 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2987 * Note that sockopt_iphdrincl_swab_systoh was called in
2992 * Handle cases where the platform does not support
2993 * retrieving the ifindex, and also platforms (such as
2994 * Solaris 8) that claim to support ifindex retrieval but do
2997 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
3002 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3004 "%s: Unable to determine incoming interface from: %pI4(%s)",
3005 __func__
, &iph
->ip_src
,
3006 ospf_get_name(ospf
));
3007 return OSPF_READ_CONTINUE
;
3011 if (ospf
->vrf_id
== VRF_DEFAULT
&& ospf
->vrf_id
!= ifp
->vrf_id
) {
3013 * We may have a situation where l3mdev_accept == 1
3014 * let's just kindly drop the packet and move on.
3015 * ospf really really really does not like when
3016 * we receive the same packet multiple times.
3018 return OSPF_READ_CONTINUE
;
3021 /* Self-originated packet should be discarded silently. */
3022 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
3023 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
3025 "ospf_read[%pI4]: Dropping self-originated packet",
3028 return OSPF_READ_CONTINUE
;
3031 /* Check that we have enough for an IP header */
3032 if ((unsigned int)(iph
->ip_hl
<< 2) >= STREAM_READABLE(ibuf
)) {
3033 if ((unsigned int)(iph
->ip_hl
<< 2) == STREAM_READABLE(ibuf
)) {
3036 "Rx'd IP packet with OSPF protocol number but no payload");
3040 "IP header length field claims header is %u bytes, but we only have %zu",
3041 (unsigned int)(iph
->ip_hl
<< 2),
3042 STREAM_READABLE(ibuf
));
3045 return OSPF_READ_ERROR
;
3047 stream_forward_getp(ibuf
, iph
->ip_hl
<< 2);
3049 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3051 != ospf_packet_examin(ospfh
, stream_get_endp(ibuf
)
3052 - stream_get_getp(ibuf
)))
3053 return OSPF_READ_CONTINUE
;
3054 /* Now it is safe to access all fields of OSPF packet header. */
3056 /* associate packet with ospf interface */
3057 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3060 * ospf_verify_header() relies on a valid "oi" and thus can be called
3061 * only after the passive/backbone/other checks below are passed.
3062 * These checks in turn access the fields of unverified "ospfh"
3063 * structure for their own purposes and must remain very accurate
3067 /* If incoming interface is passive one, ignore it. */
3068 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3069 if (IS_DEBUG_OSPF_EVENT
)
3071 "ignoring packet from router %pI4 sent to %pI4, received on a passive interface, %pI4",
3072 &ospfh
->router_id
, &iph
->ip_dst
,
3073 &oi
->address
->u
.prefix4
);
3075 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3076 /* Try to fix multicast membership.
3077 * Some OS:es may have problems in this area,
3078 * make sure it is removed.
3080 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3081 ospf_if_set_multicast(oi
);
3083 return OSPF_READ_CONTINUE
;
3087 /* if no local ospf_interface,
3088 * or header area is backbone but ospf_interface is not
3089 * check for VLINK interface
3092 || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3093 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3094 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3096 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3098 "Packet from [%pI4] received on link %s but no ospf_interface",
3099 &iph
->ip_src
, ifp
->name
);
3100 return OSPF_READ_CONTINUE
;
3105 * else it must be a local ospf interface, check it was
3106 * received on correct link
3108 else if (oi
->ifp
!= ifp
) {
3109 if (IS_DEBUG_OSPF_EVENT
)
3110 flog_warn(EC_OSPF_PACKET
,
3111 "Packet from [%pI4] received on wrong link %s",
3112 &iph
->ip_src
, ifp
->name
);
3113 return OSPF_READ_CONTINUE
;
3114 } else if (oi
->state
== ISM_Down
) {
3117 "Ignoring packet from %pI4 to %pI4 received on interface that is down [%s]; interface flags are %s",
3118 &iph
->ip_src
, &iph
->ip_dst
, ifp
->name
,
3119 if_flag_dump(ifp
->flags
));
3120 /* Fix multicast memberships? */
3121 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3122 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3123 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3124 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3125 if (oi
->multicast_memberships
)
3126 ospf_if_set_multicast(oi
);
3127 return OSPF_READ_CONTINUE
;
3131 * If the received packet is destined for AllDRouters, the
3132 * packet should be accepted only if the received ospf
3133 * interface state is either DR or Backup -- endo.
3135 * I wonder who endo is?
3137 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3138 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3141 "Dropping packet for AllDRouters from [%pI4] via [%s] (ISM: %s)",
3142 &iph
->ip_src
, IF_NAME(oi
),
3143 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3144 /* Try to fix multicast membership. */
3145 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3146 ospf_if_set_multicast(oi
);
3147 return OSPF_READ_CONTINUE
;
3150 /* Verify more OSPF header fields. */
3151 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3153 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3155 "ospf_read[%pI4]: Header check failed, dropping.",
3157 return OSPF_READ_CONTINUE
;
3160 /* Show debug receiving packet. */
3161 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3162 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3164 "-----------------------------------------------------");
3165 ospf_packet_dump(ibuf
);
3168 zlog_debug("%s received from [%pI4] via [%s]",
3169 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3170 &ospfh
->router_id
, IF_NAME(oi
));
3171 zlog_debug(" src [%pI4],", &iph
->ip_src
);
3172 zlog_debug(" dst [%pI4]", &iph
->ip_dst
);
3174 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3176 "-----------------------------------------------------");
3179 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3181 /* Adjust size to message length. */
3182 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3184 /* Read rest of the packet and call each sort of packet routine.
3186 switch (ospfh
->type
) {
3187 case OSPF_MSG_HELLO
:
3188 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3190 case OSPF_MSG_DB_DESC
:
3191 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3193 case OSPF_MSG_LS_REQ
:
3194 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3196 case OSPF_MSG_LS_UPD
:
3197 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3199 case OSPF_MSG_LS_ACK
:
3200 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3205 "interface %s(%s): OSPF packet header type %d is illegal",
3206 IF_NAME(oi
), ospf_get_name(ospf
), ospfh
->type
);
3210 return OSPF_READ_CONTINUE
;
3213 /* Starting point of packet process function. */
3214 int ospf_read(struct thread
*thread
)
3218 enum ospf_read_return_enum ret
;
3220 /* first of all get interface pointer. */
3221 ospf
= THREAD_ARG(thread
);
3223 /* prepare for next packet. */
3224 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
3226 while (count
< ospf
->write_oi_count
) {
3228 ret
= ospf_read_helper(ospf
);
3230 case OSPF_READ_ERROR
:
3232 case OSPF_READ_CONTINUE
:
3240 /* Make OSPF header. */
3241 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3244 struct ospf_header
*ospfh
;
3246 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3248 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3249 ospfh
->type
= (uint8_t)type
;
3251 ospfh
->router_id
= oi
->ospf
->router_id
;
3253 ospfh
->checksum
= 0;
3254 ospfh
->area_id
= oi
->area
->area_id
;
3255 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3257 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3259 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3262 /* Make Authentication Data. */
3263 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3265 struct crypt_key
*ck
;
3267 switch (ospf_auth_type(oi
)) {
3268 case OSPF_AUTH_NULL
:
3269 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3272 case OSPF_AUTH_SIMPLE
:
3273 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3274 OSPF_AUTH_SIMPLE_SIZE
);
3276 case OSPF_AUTH_CRYPTOGRAPHIC
:
3277 /* If key is not set, then set 0. */
3278 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3279 ospfh
->u
.crypt
.zero
= 0;
3280 ospfh
->u
.crypt
.key_id
= 0;
3281 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3284 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3285 ospfh
->u
.crypt
.zero
= 0;
3286 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3287 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3289 /* note: the seq is done in ospf_make_md5_digest() */
3292 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3300 /* Fill rest of OSPF header. */
3301 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3304 struct ospf_header
*ospfh
;
3306 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3309 ospfh
->length
= htons(length
);
3311 /* Calculate checksum. */
3312 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3313 ospfh
->checksum
= in_cksum(ospfh
, length
);
3315 ospfh
->checksum
= 0;
3317 /* Add Authentication Data. */
3318 ospf_make_auth(oi
, ospfh
);
3321 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3323 struct ospf_neighbor
*nbr
;
3324 struct route_node
*rn
;
3325 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3326 struct in_addr mask
;
3330 /* Set netmask of interface. */
3331 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3332 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3333 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3334 masklen2ip(oi
->address
->prefixlen
, &mask
);
3336 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3337 stream_put_ipv4(s
, mask
.s_addr
);
3339 /* Set Hello Interval. */
3340 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3341 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3343 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3345 if (IS_DEBUG_OSPF_EVENT
)
3346 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3350 stream_putc(s
, OPTIONS(oi
));
3352 /* Set Router Priority. */
3353 stream_putc(s
, PRIORITY(oi
));
3355 /* Set Router Dead Interval. */
3356 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3358 /* Set Designated Router. */
3359 stream_put_ipv4(s
, DR(oi
).s_addr
);
3361 p
= stream_get_endp(s
);
3363 /* Set Backup Designated Router. */
3364 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3366 /* Add neighbor seen. */
3367 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3368 if ((nbr
= rn
->info
))
3369 if (nbr
->router_id
.s_addr
3370 != INADDR_ANY
) /* Ignore 0.0.0.0 node. */
3372 != NSM_Attempt
) /* Ignore Down neighbor. */
3374 != NSM_Down
) /* This is myself for
3376 if (!IPV4_ADDR_SAME(
3378 &oi
->ospf
->router_id
)) {
3379 /* Check neighbor is
3381 if (nbr
->d_router
.s_addr
3395 /* Hello packet overflows interface MTU. */
3396 if (length
+ sizeof(uint32_t)
3397 > ospf_packet_max(oi
)) {
3399 EC_OSPF_LARGE_HELLO
,
3400 "Oversized Hello packet! Larger than MTU. Not sending it out");
3411 /* Let neighbor generate BackupSeen. */
3413 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3418 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3419 struct ospf_neighbor
*nbr
, struct stream
*s
)
3421 struct ospf_lsa
*lsa
;
3422 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3426 struct ospf_lsdb
*lsdb
;
3428 /* Set Interface MTU. */
3429 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3432 stream_putw(s
, oi
->ifp
->mtu
);
3435 options
= OPTIONS(oi
);
3436 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3437 SET_FLAG(options
, OSPF_OPTION_O
);
3438 stream_putc(s
, options
);
3441 pp
= stream_get_endp(s
);
3442 stream_putc(s
, nbr
->dd_flags
);
3444 /* Set DD Sequence Number. */
3445 stream_putl(s
, nbr
->dd_seqnum
);
3447 /* shortcut unneeded walk of (empty) summary LSDBs */
3448 if (ospf_db_summary_isempty(nbr
))
3451 /* Describe LSA Header from Database Summary List. */
3452 lsdb
= &nbr
->db_sum
;
3454 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3455 struct route_table
*table
= lsdb
->type
[i
].db
;
3456 struct route_node
*rn
;
3458 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3459 if ((lsa
= rn
->info
) != NULL
) {
3460 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3461 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3462 /* Suppress advertising
3463 * opaque-information. */
3464 /* Remove LSA from DB summary list. */
3465 ospf_lsdb_delete(lsdb
, lsa
);
3469 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3470 struct lsa_header
*lsah
;
3473 /* DD packet overflows interface MTU. */
3474 if (length
+ OSPF_LSA_HEADER_SIZE
3475 > ospf_packet_max(oi
))
3478 /* Keep pointer to LS age. */
3479 lsah
= (struct lsa_header
3484 /* Proceed stream pointer. */
3485 stream_put(s
, lsa
->data
,
3486 OSPF_LSA_HEADER_SIZE
);
3487 length
+= OSPF_LSA_HEADER_SIZE
;
3490 ls_age
= LS_AGE(lsa
);
3491 lsah
->ls_age
= htons(ls_age
);
3494 /* Remove LSA from DB summary list. */
3495 ospf_lsdb_delete(lsdb
, lsa
);
3499 /* Update 'More' bit */
3500 if (ospf_db_summary_isempty(nbr
)) {
3502 if (nbr
->state
>= NSM_Exchange
) {
3503 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3504 /* Rewrite DD flags */
3505 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3507 assert(IS_SET_DD_M(nbr
->dd_flags
));
3513 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3514 unsigned long delta
, struct ospf_neighbor
*nbr
,
3515 struct ospf_lsa
*lsa
)
3517 struct ospf_interface
*oi
;
3521 /* LS Request packet overflows interface MTU
3522 * delta is just number of bytes required for 1 LS Req
3523 * ospf_packet_max will return the number of bytes can
3524 * be accomodated without ospf header. So length+delta
3525 * can be compared to ospf_packet_max
3526 * to check if it can fit another lsreq in the same packet.
3529 if (*length
+ delta
> ospf_packet_max(oi
))
3532 stream_putl(s
, lsa
->data
->type
);
3533 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3534 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3536 ospf_lsa_unlock(&nbr
->ls_req_last
);
3537 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3543 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3545 struct ospf_lsa
*lsa
;
3546 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3547 unsigned long delta
= 12;
3548 struct route_table
*table
;
3549 struct route_node
*rn
;
3551 struct ospf_lsdb
*lsdb
;
3553 lsdb
= &nbr
->ls_req
;
3555 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3556 table
= lsdb
->type
[i
].db
;
3557 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3558 if ((lsa
= (rn
->info
)) != NULL
)
3559 if (ospf_make_ls_req_func(s
, &length
, delta
,
3562 route_unlock_node(rn
);
3569 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3573 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3575 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3578 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3581 struct ospf_lsa
*lsa
;
3582 struct listnode
*node
;
3583 uint16_t length
= 0;
3584 unsigned int size_noauth
;
3585 unsigned long delta
= stream_get_endp(s
);
3589 if (IS_DEBUG_OSPF_EVENT
)
3590 zlog_debug("ospf_make_ls_upd: Start");
3592 pp
= stream_get_endp(s
);
3593 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3594 length
+= OSPF_LS_UPD_MIN_SIZE
;
3596 /* Calculate amount of packet usable for data. */
3597 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3599 while ((node
= listhead(update
)) != NULL
) {
3600 struct lsa_header
*lsah
;
3603 lsa
= listgetdata(node
);
3606 if (IS_DEBUG_OSPF_EVENT
)
3607 zlog_debug("%s: List Iteration %d LSA[%s]", __func__
,
3608 count
, dump_lsa_key(lsa
));
3610 /* Will it fit? Minimum it has to fit atleast one */
3611 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3615 /* Keep pointer to LS age. */
3616 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3617 + stream_get_endp(s
));
3619 /* Put LSA to Link State Request. */
3620 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3623 /* each hop must increment an lsa_age by transmit_delay
3624 of OSPF interface */
3625 ls_age
= ls_age_increment(lsa
,
3626 OSPF_IF_PARAM(oi
, transmit_delay
));
3627 lsah
->ls_age
= htons(ls_age
);
3629 length
+= ntohs(lsa
->data
->length
);
3632 list_delete_node(update
, node
);
3633 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3636 /* Now set #LSAs. */
3637 stream_putl_at(s
, pp
, count
);
3639 if (IS_DEBUG_OSPF_EVENT
)
3640 zlog_debug("ospf_make_ls_upd: Stop");
3644 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3647 struct listnode
*node
, *nnode
;
3648 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3649 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3650 struct ospf_lsa
*lsa
;
3652 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3655 /* LS Ack packet overflows interface MTU
3656 * delta is just number of bytes required for
3657 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3658 * the number of bytes can be accomodated without
3659 * ospf header. So length+delta can be compared
3660 * against ospf_packet_max to check if it can fit
3661 * another ls header in the same packet.
3663 if ((length
+ delta
) > ospf_packet_max(oi
))
3666 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3667 length
+= OSPF_LSA_HEADER_SIZE
;
3669 listnode_delete(ack
, lsa
);
3670 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3676 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3678 struct ospf_packet
*op
;
3679 uint16_t length
= OSPF_HEADER_SIZE
;
3681 op
= ospf_packet_new(oi
->ifp
->mtu
);
3683 /* Prepare OSPF common header. */
3684 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3686 /* Prepare OSPF Hello body. */
3687 length
+= ospf_make_hello(oi
, op
->s
);
3688 if (length
== OSPF_HEADER_SIZE
) {
3689 /* Hello overshooting MTU */
3690 ospf_packet_free(op
);
3694 /* Fill OSPF header. */
3695 ospf_fill_header(oi
, op
->s
, length
);
3697 /* Set packet length. */
3698 op
->length
= length
;
3700 op
->dst
.s_addr
= addr
;
3702 if (IS_DEBUG_OSPF_EVENT
) {
3703 if (oi
->ospf
->vrf_id
)
3705 "%s: Hello Tx interface %s ospf vrf %s id %u",
3706 __func__
, oi
->ifp
->name
,
3707 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3710 /* Add packet to the top of the interface output queue, so that they
3711 * can't get delayed by things like long queues of LS Update packets
3713 ospf_packet_add_top(oi
, op
);
3715 /* Hook thread to write packet. */
3716 OSPF_ISM_WRITE_ON(oi
->ospf
);
3719 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3721 struct ospf_interface
*oi
;
3726 /* If this is passive interface, do not send OSPF Hello. */
3727 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3730 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3733 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3736 if (PRIORITY(oi
) == 0)
3739 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3740 && oi
->state
!= ISM_Backup
)
3743 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3746 int ospf_poll_timer(struct thread
*thread
)
3748 struct ospf_nbr_nbma
*nbr_nbma
;
3750 nbr_nbma
= THREAD_ARG(thread
);
3751 nbr_nbma
->t_poll
= NULL
;
3753 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3754 zlog_debug("NSM[%s:%pI4]: Timer (Poll timer expire)",
3755 IF_NAME(nbr_nbma
->oi
), &nbr_nbma
->addr
);
3757 ospf_poll_send(nbr_nbma
);
3759 if (nbr_nbma
->v_poll
> 0)
3760 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3767 int ospf_hello_reply_timer(struct thread
*thread
)
3769 struct ospf_neighbor
*nbr
;
3771 nbr
= THREAD_ARG(thread
);
3772 nbr
->t_hello_reply
= NULL
;
3774 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3775 zlog_debug("NSM[%s:%pI4]: Timer (hello-reply timer expire)",
3776 IF_NAME(nbr
->oi
), &nbr
->router_id
);
3778 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3783 /* Send OSPF Hello. */
3784 void ospf_hello_send(struct ospf_interface
*oi
)
3786 /* If this is passive interface, do not send OSPF Hello. */
3787 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3790 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3791 struct ospf_neighbor
*nbr
;
3792 struct route_node
*rn
;
3794 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3795 if ((nbr
= rn
->info
))
3796 if (nbr
!= oi
->nbr_self
)
3797 if (nbr
->state
!= NSM_Down
) {
3798 /* RFC 2328 Section 9.5.1
3799 If the router is not
3800 eligible to become Designated
3802 it must periodically send
3803 Hello Packets to both the
3804 Designated Router and the
3805 Backup Designated Router (if
3808 if (PRIORITY(oi
) == 0
3819 /* If the router is eligible to
3820 become Designated Router, it
3821 must periodically send Hello
3822 Packets to all neighbors that
3823 are also eligible. In
3824 addition, if the router is
3826 Designated Router or Backup
3827 Designated Router, it must
3829 send periodic Hello Packets
3830 to all other neighbors. */
3832 if (nbr
->priority
== 0
3833 && oi
->state
== ISM_DROther
)
3835 /* if oi->state == Waiting, send
3836 * hello to all neighbors */
3837 ospf_hello_send_sub(
3839 nbr
->address
.u
.prefix4
3843 /* Decide destination address. */
3844 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3845 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3847 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3851 /* Send OSPF Database Description. */
3852 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3854 struct ospf_interface
*oi
;
3855 struct ospf_packet
*op
;
3856 uint16_t length
= OSPF_HEADER_SIZE
;
3859 op
= ospf_packet_new(oi
->ifp
->mtu
);
3861 /* Prepare OSPF common header. */
3862 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3864 /* Prepare OSPF Database Description body. */
3865 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3867 /* Fill OSPF header. */
3868 ospf_fill_header(oi
, op
->s
, length
);
3870 /* Set packet length. */
3871 op
->length
= length
;
3873 /* Decide destination address. */
3874 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3875 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3877 op
->dst
= nbr
->address
.u
.prefix4
;
3879 /* Add packet to the interface output queue. */
3880 ospf_packet_add(oi
, op
);
3882 /* Hook thread to write packet. */
3883 OSPF_ISM_WRITE_ON(oi
->ospf
);
3885 /* Remove old DD packet, then copy new one and keep in neighbor
3888 ospf_packet_free(nbr
->last_send
);
3889 nbr
->last_send
= ospf_packet_dup(op
);
3890 monotime(&nbr
->last_send_ts
);
3891 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3893 "%s:Packet[DD]: %pI4 DB Desc send with seqnum:%x , flags:%x",
3894 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
3895 &nbr
->router_id
, nbr
->dd_seqnum
,
3899 /* Re-send Database Description. */
3900 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3902 struct ospf_interface
*oi
;
3906 /* Add packet to the interface output queue. */
3907 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3909 /* Hook thread to write packet. */
3910 OSPF_ISM_WRITE_ON(oi
->ospf
);
3911 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3913 "%s:Packet[DD]: %pI4 DB Desc resend with seqnum:%x , flags:%x",
3914 (oi
->ospf
->name
) ? oi
->ospf
->name
: VRF_DEFAULT_NAME
,
3915 &nbr
->router_id
, nbr
->dd_seqnum
,
3919 /* Send Link State Request. */
3920 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3922 struct ospf_interface
*oi
;
3923 struct ospf_packet
*op
;
3924 uint16_t length
= OSPF_HEADER_SIZE
;
3927 op
= ospf_packet_new(oi
->ifp
->mtu
);
3929 /* Prepare OSPF common header. */
3930 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3932 /* Prepare OSPF Link State Request body. */
3933 length
+= ospf_make_ls_req(nbr
, op
->s
);
3934 if (length
== OSPF_HEADER_SIZE
) {
3935 ospf_packet_free(op
);
3939 /* Fill OSPF header. */
3940 ospf_fill_header(oi
, op
->s
, length
);
3942 /* Set packet length. */
3943 op
->length
= length
;
3945 /* Decide destination address. */
3946 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3947 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3949 op
->dst
= nbr
->address
.u
.prefix4
;
3951 /* Add packet to the interface output queue. */
3952 ospf_packet_add(oi
, op
);
3954 /* Hook thread to write packet. */
3955 OSPF_ISM_WRITE_ON(oi
->ospf
);
3957 /* Add Link State Request Retransmission Timer. */
3958 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3961 /* Send Link State Update with an LSA. */
3962 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3965 struct list
*update
;
3967 update
= list_new();
3969 listnode_add(update
, lsa
);
3971 /*ospf instance is going down, send self originated
3972 * MAXAGE LSA update to neighbors to remove from LSDB */
3973 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3974 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3976 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3978 list_delete(&update
);
3981 /* Determine size for packet. Must be at least big enough to accomodate next
3982 * LSA on list, which may be bigger than MTU size.
3984 * Return pointer to new ospf_packet
3985 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3986 * on packet sizes (in which case offending LSA is deleted from update list)
3988 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3989 struct ospf_interface
*oi
)
3991 struct ospf_lsa
*lsa
;
3992 struct listnode
*ln
;
3994 static char warned
= 0;
3996 lsa
= listgetdata((ln
= listhead(update
)));
3999 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
4000 > ospf_packet_max(oi
)) {
4004 "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 ..'");
4008 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
4010 "ospf_ls_upd_packet_new: oversized LSA id:%pI4, %d bytes originated by %pI4, will be fragmented!",
4012 ntohs(lsa
->data
->length
),
4013 &lsa
->data
->adv_router
);
4016 * Allocate just enough to fit this LSA only, to avoid including
4018 * LSAs in fragmented LSA Updates.
4020 size
= ntohs(lsa
->data
->length
)
4021 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
4022 + OSPF_LS_UPD_MIN_SIZE
;
4024 size
= oi
->ifp
->mtu
;
4026 if (size
> OSPF_MAX_PACKET_SIZE
) {
4027 flog_warn(EC_OSPF_LARGE_LSA
,
4028 "ospf_ls_upd_packet_new: oversized LSA id:%pI4 too big, %d bytes, packet size %ld, dropping it completely. OSPF routing is broken!",
4029 &lsa
->data
->id
, ntohs(lsa
->data
->length
),
4031 list_delete_node(update
, ln
);
4035 /* IP header is built up separately by ospf_write(). This means, that we
4037 * reduce the "affordable" size just calculated by length of an IP
4039 * This makes sure, that even if we manage to fill the payload with LSA
4041 * completely, the final packet (our data plus IP header) still fits
4043 * outgoing interface MTU. This correction isn't really meaningful for
4045 * oversized LSA, but for consistency the correction is done for both
4048 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
4050 return ospf_packet_new(size
- sizeof(struct ip
));
4053 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
4054 struct list
*update
, struct in_addr addr
,
4057 struct ospf_packet
*op
;
4058 uint16_t length
= OSPF_HEADER_SIZE
;
4060 if (IS_DEBUG_OSPF_EVENT
)
4061 zlog_debug("listcount = %d, [%s]dst %pI4", listcount(update
),
4062 IF_NAME(oi
), &addr
);
4064 /* Check that we have really something to process */
4065 if (listcount(update
) == 0)
4068 op
= ospf_ls_upd_packet_new(update
, oi
);
4070 /* Prepare OSPF common header. */
4071 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4073 /* Prepare OSPF Link State Update body.
4074 * Includes Type-7 translation.
4076 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4078 /* Fill OSPF header. */
4079 ospf_fill_header(oi
, op
->s
, length
);
4081 /* Set packet length. */
4082 op
->length
= length
;
4084 /* Decide destination address. */
4085 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4086 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4088 op
->dst
.s_addr
= addr
.s_addr
;
4090 /* Add packet to the interface output queue. */
4091 ospf_packet_add(oi
, op
);
4092 /* Call ospf_write() right away to send ospf packets to neighbors */
4093 if (send_lsupd_now
) {
4094 struct thread os_packet_thd
;
4096 os_packet_thd
.arg
= (void *)oi
->ospf
;
4097 if (oi
->on_write_q
== 0) {
4098 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4101 ospf_write(&os_packet_thd
);
4103 * We are fake calling ospf_write with a fake
4104 * thread. Imagine that we have oi_a already
4105 * enqueued and we have turned on the write
4107 * Now this function calls this for oi_b
4108 * so the on_write_q has oi_a and oi_b on
4109 * it, ospf_write runs and clears the packets
4110 * for both oi_a and oi_b. Removing them from
4111 * the on_write_q. After this thread of execution
4112 * finishes we will execute the t_write thread
4113 * with nothing in the on_write_q causing an
4114 * assert. So just make sure that the t_write
4115 * is actually turned off.
4117 if (list_isempty(oi
->ospf
->oi_write_q
))
4118 OSPF_TIMER_OFF(oi
->ospf
->t_write
);
4120 /* Hook thread to write packet. */
4121 OSPF_ISM_WRITE_ON(oi
->ospf
);
4125 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
4127 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4128 struct route_node
*rn
;
4129 struct route_node
*rnext
;
4130 struct list
*update
;
4133 oi
->t_ls_upd_event
= NULL
;
4135 if (IS_DEBUG_OSPF_EVENT
)
4136 zlog_debug("ospf_ls_upd_send_queue start");
4138 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4139 rnext
= route_next(rn
);
4141 if (rn
->info
== NULL
)
4144 update
= (struct list
*)rn
->info
;
4146 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4148 /* list might not be empty. */
4149 if (listcount(update
) == 0) {
4150 list_delete((struct list
**)&rn
->info
);
4151 route_unlock_node(rn
);
4157 if (IS_DEBUG_OSPF_EVENT
)
4159 "ospf_ls_upd_send_queue: update lists not cleared, %d nodes to try again, raising new event",
4161 oi
->t_ls_upd_event
= NULL
;
4162 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4163 &oi
->t_ls_upd_event
);
4166 if (IS_DEBUG_OSPF_EVENT
)
4167 zlog_debug("ospf_ls_upd_send_queue stop");
4172 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4175 struct ospf_interface
*oi
;
4176 struct ospf_lsa
*lsa
;
4177 struct prefix_ipv4 p
;
4178 struct route_node
*rn
;
4179 struct listnode
*node
;
4184 p
.prefixlen
= IPV4_MAX_BITLEN
;
4186 /* Decide destination address. */
4187 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4188 p
.prefix
= oi
->vl_data
->peer_addr
;
4189 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4190 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4191 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4192 p
.prefix
= nbr
->address
.u
.prefix4
;
4193 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4194 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4195 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4196 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4198 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4200 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4201 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4204 "* LS-Update is directly sent on NBMA network.");
4205 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4206 flog_warn(EC_OSPF_PACKET
,
4207 "* LS-Update is sent to myself.");
4210 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4212 if (rn
->info
== NULL
)
4213 rn
->info
= list_new();
4215 route_unlock_node(rn
);
4217 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4218 listnode_add(rn
->info
,
4219 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4220 if (send_lsupd_now
) {
4221 struct list
*send_update_list
;
4222 struct route_node
*rnext
;
4224 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4225 rnext
= route_next(rn
);
4227 if (rn
->info
== NULL
)
4230 send_update_list
= (struct list
*)rn
->info
;
4232 ospf_ls_upd_queue_send(oi
, send_update_list
,
4233 rn
->p
.u
.prefix4
, 1);
4236 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4237 &oi
->t_ls_upd_event
);
4240 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4243 struct ospf_packet
*op
;
4244 uint16_t length
= OSPF_HEADER_SIZE
;
4246 op
= ospf_packet_new(oi
->ifp
->mtu
);
4248 /* Prepare OSPF common header. */
4249 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4251 /* Prepare OSPF Link State Acknowledgment body. */
4252 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4254 /* Fill OSPF header. */
4255 ospf_fill_header(oi
, op
->s
, length
);
4257 /* Set packet length. */
4258 op
->length
= length
;
4260 /* Decide destination address. */
4261 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4262 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4264 op
->dst
.s_addr
= dst
.s_addr
;
4266 /* Add packet to the interface output queue. */
4267 ospf_packet_add(oi
, op
);
4269 /* Hook thread to write packet. */
4270 OSPF_ISM_WRITE_ON(oi
->ospf
);
4273 static int ospf_ls_ack_send_event(struct thread
*thread
)
4275 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4277 oi
->t_ls_ack_direct
= NULL
;
4279 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4280 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4281 oi
->ls_ack_direct
.dst
);
4286 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4288 struct ospf_interface
*oi
= nbr
->oi
;
4290 if (IS_GRACE_LSA(lsa
)) {
4291 if (IS_DEBUG_OSPF_GR
)
4292 zlog_debug("%s, Sending GRACE ACK to Restarter.",
4296 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4297 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4299 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4301 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4302 &oi
->t_ls_ack_direct
);
4305 /* Send Link State Acknowledgment delayed. */
4306 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4310 /* Decide destination address. */
4311 /* RFC2328 Section 13.5 On non-broadcast
4312 networks, delayed Link State Acknowledgment packets must be
4313 unicast separately over each adjacency (i.e., neighbor whose
4314 state is >= Exchange). */
4315 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4316 struct ospf_neighbor
*nbr
;
4317 struct route_node
*rn
;
4319 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4320 if ((nbr
= rn
->info
) != NULL
)
4321 if (nbr
!= oi
->nbr_self
4322 && nbr
->state
>= NSM_Exchange
)
4323 while (listcount(oi
->ls_ack
))
4324 ospf_ls_ack_send_list(
4326 nbr
->address
.u
.prefix4
);
4329 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4330 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4331 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4332 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4333 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4334 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4335 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4336 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4338 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4340 while (listcount(oi
->ls_ack
))
4341 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4345 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4346 * address. As a result, the kernel does not need to learn the interface
4347 * MAC of the OSPF neighbor. However, in our world, this will delay
4348 * convergence. Take the case when due to a link flap, all routes now
4349 * want to use an interface which was deemed to be costlier prior to this
4350 * event. For routes that will be installed, the missing MAC will have
4351 * punt-to-CPU set on them. This may overload the CPU control path that
4352 * can be avoided if the MAC was known apriori.
4354 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4356 if (!nbr
|| !nbr
->oi
->ospf
->proactive_arp
)
4359 ospf_zebra_send_arp(nbr
->oi
->ifp
, &nbr
->address
);