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
[] = {
102 0, /* OSPF_UNKNOWN_LSA */
103 OSPF_ROUTER_LSA_MIN_SIZE
, /* OSPF_ROUTER_LSA */
104 OSPF_NETWORK_LSA_MIN_SIZE
, /* OSPF_NETWORK_LSA */
105 OSPF_SUMMARY_LSA_MIN_SIZE
, /* OSPF_SUMMARY_LSA */
106 OSPF_SUMMARY_LSA_MIN_SIZE
, /* OSPF_ASBR_SUMMARY_LSA */
107 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
, /* OSPF_AS_EXTERNAL_LSA */
108 0, /* Unsupported, OSPF_GROUP_MEMBER_LSA */
109 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
, /* OSPF_AS_NSSA_LSA */
110 0, /* Unsupported, OSPF_EXTERNAL_ATTRIBURES_LSA */
111 OSPF_OPAQUE_LSA_MIN_SIZE
, /* OSPF_OPAQUE_LINK_LSA */
112 OSPF_OPAQUE_LSA_MIN_SIZE
, /* OSPF_OPAQUE_AREA_LSA */
113 OSPF_OPAQUE_LSA_MIN_SIZE
, /* OSPF_OPAQUE_AS_LSA */
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 frr_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
)
443 flog_warn(EC_OSPF_MD5
,
444 "%s: length mismatch stream %lu ospf_packet %u",
445 __func__
, (unsigned long)stream_get_endp(op
->s
),
448 return OSPF_AUTH_MD5_SIZE
;
452 static void 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
);
467 void ospf_ls_req_event(struct ospf_neighbor
*nbr
)
469 THREAD_OFF(nbr
->t_ls_req
);
470 thread_add_event(master
, ospf_ls_req_timer
, nbr
, 0, &nbr
->t_ls_req
);
473 /* Cyclic timer function. Fist registered in ospf_nbr_new () in
475 void ospf_ls_upd_timer(struct thread
*thread
)
477 struct ospf_neighbor
*nbr
;
479 nbr
= THREAD_ARG(thread
);
480 nbr
->t_ls_upd
= NULL
;
482 /* Send Link State Update. */
483 if (ospf_ls_retransmit_count(nbr
) > 0) {
485 struct ospf_lsdb
*lsdb
;
487 int retransmit_interval
;
489 retransmit_interval
=
490 OSPF_IF_PARAM(nbr
->oi
, retransmit_interval
);
492 lsdb
= &nbr
->ls_rxmt
;
495 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
496 struct route_table
*table
= lsdb
->type
[i
].db
;
497 struct route_node
*rn
;
499 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
500 struct ospf_lsa
*lsa
;
502 if ((lsa
= rn
->info
) != NULL
) {
503 /* Don't retransmit an LSA if we
505 the last RxmtInterval seconds - this
507 neighbour a chance to acknowledge the
509 have ben just received before the
511 fired. This is a small tweak to what
513 but it will cut out out a lot of
516 if (monotime_since(&lsa
->tv_recv
, NULL
)
517 >= retransmit_interval
* 1000000LL)
518 listnode_add(update
, rn
->info
);
523 if (listcount(update
) > 0)
524 ospf_ls_upd_send(nbr
, update
, OSPF_SEND_PACKET_DIRECT
,
526 list_delete(&update
);
529 /* Set LS Update retransmission timer. */
530 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
, nbr
->v_ls_upd
);
533 void ospf_ls_ack_timer(struct thread
*thread
)
535 struct ospf_interface
*oi
;
537 oi
= THREAD_ARG(thread
);
540 /* Send Link State Acknowledgment. */
541 if (listcount(oi
->ls_ack
) > 0)
542 ospf_ls_ack_send_delayed(oi
);
544 /* Set LS Ack timer. */
545 OSPF_ISM_TIMER_ON(oi
->t_ls_ack
, ospf_ls_ack_timer
, oi
->v_ls_ack
);
548 #ifdef WANT_OSPF_WRITE_FRAGMENT
549 static void ospf_write_frags(int fd
, struct ospf_packet
*op
, struct ip
*iph
,
550 struct msghdr
*msg
, unsigned int maxdatasize
,
551 unsigned int mtu
, int flags
, uint8_t type
)
553 #define OSPF_WRITE_FRAG_SHIFT 3
558 assert(op
->length
== stream_get_endp(op
->s
));
559 assert(msg
->msg_iovlen
== 2);
563 * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
564 * well as the IP_MF flag, making this all quite pointless.
566 * However, for a system on which IP_MF is left alone, and ip_id left
567 * alone or else which sets same ip_id for each fragment this might
570 * XXX-TODO: It would be much nicer to have the kernel's use their
571 * existing fragmentation support to do this for us. Bugs/RFEs need to
572 * be raised against the various kernels.
576 iph
->ip_off
|= IP_MF
;
578 /* ip frag offset is expressed in units of 8byte words */
579 offset
= maxdatasize
>> OSPF_WRITE_FRAG_SHIFT
;
581 iovp
= &msg
->msg_iov
[1];
583 while ((stream_get_endp(op
->s
) - stream_get_getp(op
->s
))
585 /* data length of this frag is to next offset value */
586 iovp
->iov_len
= offset
<< OSPF_WRITE_FRAG_SHIFT
;
587 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
588 assert(iph
->ip_len
<= mtu
);
590 sockopt_iphdrincl_swab_htosys(iph
);
592 ret
= sendmsg(fd
, msg
, flags
);
594 sockopt_iphdrincl_swab_systoh(iph
);
599 "*** %s: sendmsg failed to %pI4, id %d, off %d, len %d, mtu %u failed with %s",
600 __func__
, &iph
->ip_dst
, iph
->ip_id
, iph
->ip_off
,
601 iph
->ip_len
, mtu
, safe_strerror(errno
));
603 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
604 zlog_debug("%s: sent id %d, off %d, len %d to %pI4",
605 __func__
, iph
->ip_id
, iph
->ip_off
,
606 iph
->ip_len
, &iph
->ip_dst
);
609 iph
->ip_off
+= offset
;
610 stream_forward_getp(op
->s
, iovp
->iov_len
);
611 iovp
->iov_base
= stream_pnt(op
->s
);
614 /* setup for final fragment */
615 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
616 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
617 iph
->ip_off
&= (~IP_MF
);
619 #endif /* WANT_OSPF_WRITE_FRAGMENT */
621 static void ospf_write(struct thread
*thread
)
623 struct ospf
*ospf
= THREAD_ARG(thread
);
624 struct ospf_interface
*oi
;
625 struct ospf_packet
*op
;
626 struct sockaddr_in sa_dst
;
633 struct listnode
*node
;
634 #ifdef WANT_OSPF_WRITE_FRAGMENT
635 static uint16_t ipid
= 0;
636 uint16_t maxdatasize
;
637 #endif /* WANT_OSPF_WRITE_FRAGMENT */
638 #define OSPF_WRITE_IPHL_SHIFT 2
642 unsigned char cmsgbuf
[64] = {};
643 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
644 struct in_pktinfo
*pi
;
647 if (ospf
->fd
< 0 || ospf
->oi_running
== 0) {
648 if (IS_DEBUG_OSPF_EVENT
)
649 zlog_debug("%s failed to send, fd %d, instance %u",
650 __func__
, ospf
->fd
, ospf
->oi_running
);
654 node
= listhead(ospf
->oi_write_q
);
656 oi
= listgetdata(node
);
658 #ifdef WANT_OSPF_WRITE_FRAGMENT
659 /* seed ipid static with low order bits of time */
661 ipid
= (time(NULL
) & 0xffff);
662 #endif /* WANT_OSPF_WRITE_FRAGMENT */
664 while ((pkt_count
< ospf
->write_oi_count
) && oi
) {
666 #ifdef WANT_OSPF_WRITE_FRAGMENT
667 /* convenience - max OSPF data per packet */
668 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
669 #endif /* WANT_OSPF_WRITE_FRAGMENT */
670 /* Get one packet from queue. */
671 op
= ospf_fifo_head(oi
->obuf
);
673 assert(op
->length
>= OSPF_HEADER_SIZE
);
675 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
676 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
677 ospf_if_ipmulticast(ospf
, oi
->address
,
680 /* Rewrite the md5 signature & update the seq */
681 ospf_make_md5_digest(oi
, op
);
683 /* Retrieve OSPF packet type. */
684 stream_set_getp(op
->s
, 1);
685 type
= stream_getc(op
->s
);
687 /* reset get pointer */
688 stream_set_getp(op
->s
, 0);
690 memset(&iph
, 0, sizeof(iph
));
691 memset(&sa_dst
, 0, sizeof(sa_dst
));
693 sa_dst
.sin_family
= AF_INET
;
694 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
695 sa_dst
.sin_len
= sizeof(sa_dst
);
696 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
697 sa_dst
.sin_addr
= op
->dst
;
698 sa_dst
.sin_port
= htons(0);
700 /* Set DONTROUTE flag if dst is unicast. */
701 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
702 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
703 flags
= MSG_DONTROUTE
;
705 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
706 /* it'd be very strange for header to not be 4byte-word aligned
708 if (sizeof(struct ip
)
709 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
710 iph
.ip_hl
++; /* we presume sizeof(struct ip) cant
713 iph
.ip_v
= IPVERSION
;
714 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
715 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
717 #if defined(__DragonFly__)
719 * DragonFly's raw socket expects ip_len/ip_off in network byte
722 iph
.ip_len
= htons(iph
.ip_len
);
725 #ifdef WANT_OSPF_WRITE_FRAGMENT
726 /* XXX-MT: not thread-safe at all..
727 * XXX: this presumes this is only programme sending OSPF
729 * otherwise, no guarantee ipid will be unique
732 #endif /* WANT_OSPF_WRITE_FRAGMENT */
735 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
736 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
738 iph
.ip_ttl
= OSPF_IP_TTL
;
739 iph
.ip_p
= IPPROTO_OSPFIGP
;
741 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
742 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
744 memset(&msg
, 0, sizeof(msg
));
745 msg
.msg_name
= (caddr_t
)&sa_dst
;
746 msg
.msg_namelen
= sizeof(sa_dst
);
750 iov
[0].iov_base
= (char *)&iph
;
751 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
752 iov
[1].iov_base
= stream_pnt(op
->s
);
753 iov
[1].iov_len
= op
->length
;
756 msg
.msg_control
= (caddr_t
)cm
;
757 cm
->cmsg_level
= SOL_IP
;
758 cm
->cmsg_type
= IP_PKTINFO
;
759 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
760 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
761 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
763 msg
.msg_controllen
= cm
->cmsg_len
;
766 /* Sadly we can not rely on kernels to fragment packets
767 * because of either IP_HDRINCL and/or multicast
768 * destination being set.
771 #ifdef WANT_OSPF_WRITE_FRAGMENT
772 if (op
->length
> maxdatasize
)
773 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
774 oi
->ifp
->mtu
, flags
, type
);
775 #endif /* WANT_OSPF_WRITE_FRAGMENT */
777 /* send final fragment (could be first) */
778 sockopt_iphdrincl_swab_htosys(&iph
);
779 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
780 sockopt_iphdrincl_swab_systoh(&iph
);
781 if (IS_DEBUG_OSPF_EVENT
)
783 "%s to %pI4, id %d, off %d, len %d, interface %s, mtu %u:",
784 __func__
, &iph
.ip_dst
, iph
.ip_id
, iph
.ip_off
,
785 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
787 /* sendmsg will return EPERM if firewall is blocking sending.
788 * This is a normal situation when 'ip nhrp map multicast xxx'
789 * is being used to send multicast packets to DMVPN peers. In
790 * that case the original message is blocked with iptables rule
791 * causing the EPERM result
793 if (ret
< 0 && errno
!= EPERM
)
796 "*** sendmsg in %s failed to %pI4, id %d, off %d, len %d, interface %s, mtu %u: %s",
797 __func__
, &iph
.ip_dst
, iph
.ip_id
, iph
.ip_off
,
798 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
799 safe_strerror(errno
));
801 /* Show debug sending packet. */
802 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
803 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
805 "-----------------------------------------------------");
806 stream_set_getp(op
->s
, 0);
807 ospf_packet_dump(op
->s
);
810 zlog_debug("%s sent to [%pI4] via [%s].",
811 lookup_msg(ospf_packet_type_str
, type
, NULL
),
812 &op
->dst
, IF_NAME(oi
));
814 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
816 "-----------------------------------------------------");
823 case OSPF_MSG_DB_DESC
:
826 case OSPF_MSG_LS_REQ
:
829 case OSPF_MSG_LS_UPD
:
832 case OSPF_MSG_LS_ACK
:
839 /* Now delete packet from queue. */
840 ospf_packet_delete(oi
);
842 /* Move this interface to the tail of write_q to
843 serve everyone in a round robin fashion */
844 list_delete_node(ospf
->oi_write_q
, node
);
845 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
849 listnode_add(ospf
->oi_write_q
, oi
);
851 /* Setup to service from the head of the queue again */
852 if (!list_isempty(ospf
->oi_write_q
)) {
853 node
= listhead(ospf
->oi_write_q
);
854 oi
= listgetdata(node
);
858 /* If packets still remain in queue, call write thread. */
859 if (!list_isempty(ospf
->oi_write_q
))
860 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
864 /* OSPF Hello message read -- RFC2328 Section 10.5. */
865 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
866 struct stream
*s
, struct ospf_interface
*oi
, int size
)
868 struct ospf_hello
*hello
;
869 struct ospf_neighbor
*nbr
;
873 /* increment statistics. */
876 hello
= (struct ospf_hello
*)stream_pnt(s
);
878 /* If Hello is myself, silently discard. */
879 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
880 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
882 "ospf_header[%s/%pI4]: selforiginated, dropping.",
883 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
890 /* get neighbor prefix. */
892 p
.prefixlen
= ip_masklen(hello
->network_mask
);
893 p
.u
.prefix4
= iph
->ip_src
;
895 /* Compare network mask. */
896 /* Checking is ignored for Point-to-Point and Virtual link. */
897 /* Checking is also ignored for Point-to-Multipoint with /32 prefix */
898 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
899 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
900 && !(oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
901 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
))
902 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
905 "Packet %pI4 [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
906 &ospfh
->router_id
, IF_NAME(oi
),
907 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
911 /* Compare Router Dead Interval. */
912 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
913 flog_warn(EC_OSPF_PACKET
,
914 "Packet %pI4 [Hello:RECV]: RouterDeadInterval mismatch (expected %u, but received %u).",
916 OSPF_IF_PARAM(oi
, v_wait
),
917 ntohl(hello
->dead_interval
));
921 /* Compare Hello Interval - ignored if fast-hellos are set. */
922 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
923 if (OSPF_IF_PARAM(oi
, v_hello
)
924 != ntohs(hello
->hello_interval
)) {
927 "Packet %pI4 [Hello:RECV]: HelloInterval mismatch (expected %u, but received %u).",
929 OSPF_IF_PARAM(oi
, v_hello
),
930 ntohs(hello
->hello_interval
));
935 if (IS_DEBUG_OSPF_EVENT
)
936 zlog_debug("Packet %pI4 [Hello:RECV]: Options %s vrf %s",
938 ospf_options_dump(hello
->options
),
939 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
941 /* Compare options. */
942 #define REJECT_IF_TBIT_ON 1 /* XXX */
943 #ifdef REJECT_IF_TBIT_ON
944 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
946 * This router does not support non-zero TOS.
947 * Drop this Hello packet not to establish neighbor
950 flog_warn(EC_OSPF_PACKET
,
951 "Packet %pI4 [Hello:RECV]: T-bit on, drop it.",
955 #endif /* REJECT_IF_TBIT_ON */
957 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
958 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
960 * This router does know the correct usage of O-bit
961 * the bit should be set in DD packet only.
963 flog_warn(EC_OSPF_PACKET
,
964 "Packet %pI4 [Hello:RECV]: O-bit abuse?",
966 #ifdef STRICT_OBIT_USAGE_CHECK
967 return; /* Reject this packet. */
968 #else /* STRICT_OBIT_USAGE_CHECK */
969 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
970 #endif /* STRICT_OBIT_USAGE_CHECK */
973 /* new for NSSA is to ensure that NP is on and E is off */
975 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
976 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
977 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
978 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
979 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
982 "NSSA-Packet-%pI4[Hello:RECV]: my options: %x, his options %x",
983 &ospfh
->router_id
, OPTIONS(oi
),
987 if (IS_DEBUG_OSPF_NSSA
)
988 zlog_debug("NSSA-Hello:RECV:Packet from %pI4:",
991 /* The setting of the E-bit found in the Hello Packet's Options
992 field must match this area's ExternalRoutingCapability A
993 mismatch causes processing to stop and the packet to be
994 dropped. The setting of the rest of the bits in the Hello
995 Packet's Options field should be ignored. */
996 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
997 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1000 "Packet %pI4 [Hello:RECV]: my options: %x, his options %x",
1001 &ospfh
->router_id
, OPTIONS(oi
),
1006 /* get neighbour struct */
1007 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1009 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1012 old_state
= nbr
->state
;
1014 /* Add event to thread. */
1015 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_HelloReceived
);
1017 /* RFC2328 Section 9.5.1
1018 If the router is not eligible to become Designated Router,
1019 (snip) It must also send an Hello Packet in reply to an
1020 Hello Packet received from any eligible neighbor (other than
1021 the current Designated Router and Backup Designated Router). */
1022 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1023 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1024 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1025 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1026 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1027 ospf_hello_reply_timer
,
1028 OSPF_HELLO_REPLY_DELAY
);
1030 /* on NBMA network type, it happens to receive bidirectional Hello
1032 without advance 1-Way Received event.
1033 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1034 if (oi
->type
== OSPF_IFTYPE_NBMA
1035 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1036 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1037 nbr
->priority
= hello
->priority
;
1038 nbr
->d_router
= hello
->d_router
;
1039 nbr
->bd_router
= hello
->bd_router
;
1043 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1044 size
- OSPF_HELLO_MIN_SIZE
)) {
1045 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1046 nbr
->options
|= hello
->options
;
1048 /* If the router is DR_OTHER, RESTARTER will not wait
1049 * until it receives the hello from it if it receives
1051 * So, helper might receives ONW_WAY hello from
1052 * RESTARTER. So not allowing to change the state if it
1053 * receives one_way hellow when it acts as HELPER for
1054 * that specific neighbor.
1056 if (!OSPF_GR_IS_ACTIVE_HELPER(nbr
))
1057 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1058 /* Set neighbor information. */
1059 nbr
->priority
= hello
->priority
;
1060 nbr
->d_router
= hello
->d_router
;
1061 nbr
->bd_router
= hello
->bd_router
;
1065 if (OSPF_GR_IS_ACTIVE_HELPER(nbr
)) {
1066 /* As per the GR Conformance Test Case 7.2. Section 3
1067 * "Also, if X was the Designated Router on network segment S
1068 * when the helping relationship began, Y maintains X as the
1069 * Designated Router until the helping relationship is
1071 * When I am helper for this neighbor, I should not trigger the
1072 * ISM Events. Also Intentionally not setting the priority and
1073 * other fields so that when the neighbor exits the Grace
1074 * period, it can handle if there is any change before GR and
1076 if (IS_DEBUG_OSPF_GR
)
1078 "%s, Neighbor is under GR Restart, hence ignoring the ISM Events",
1079 __PRETTY_FUNCTION__
);
1081 /* If neighbor itself declares DR and no BDR exists,
1082 cause event BackupSeen */
1083 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1084 if (hello
->bd_router
.s_addr
== INADDR_ANY
1085 && oi
->state
== ISM_Waiting
)
1086 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1088 /* neighbor itself declares BDR. */
1089 if (oi
->state
== ISM_Waiting
1090 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1092 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1094 /* had not previously. */
1095 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1096 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1097 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1098 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1100 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1102 /* had not previously. */
1103 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1104 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1105 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
,
1107 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1109 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1111 /* Neighbor priority check. */
1112 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1113 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1116 /* Set neighbor information. */
1117 nbr
->priority
= hello
->priority
;
1118 nbr
->d_router
= hello
->d_router
;
1119 nbr
->bd_router
= hello
->bd_router
;
1122 * RFC 3623 - Section 2:
1123 * "If the restarting router determines that it was the Designated
1124 * Router on a given segment prior to the restart, it elects
1125 * itself as the Designated Router again. The restarting router
1126 * knows that it was the Designated Router if, while the
1127 * associated interface is in Waiting state, a Hello packet is
1128 * received from a neighbor listing the router as the Designated
1131 if (oi
->area
->ospf
->gr_info
.restart_in_progress
1132 && oi
->state
== ISM_Waiting
1133 && IPV4_ADDR_SAME(&hello
->d_router
, &oi
->address
->u
.prefix4
))
1134 DR(oi
) = hello
->d_router
;
1137 /* Save DD flags/options/Seqnum received. */
1138 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1139 struct ospf_db_desc
*dd
)
1141 nbr
->last_recv
.flags
= dd
->flags
;
1142 nbr
->last_recv
.options
= dd
->options
;
1143 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1146 /* Process rest of DD packet. */
1147 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1148 struct ospf_neighbor
*nbr
,
1149 struct ospf_db_desc
*dd
, uint16_t size
)
1151 struct ospf_lsa
*new, *find
;
1152 struct lsa_header
*lsah
;
1154 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1155 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1156 size
-= OSPF_LSA_HEADER_SIZE
) {
1157 lsah
= (struct lsa_header
*)stream_pnt(s
);
1158 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1160 /* Unknown LS type. */
1161 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1162 flog_warn(EC_OSPF_PACKET
,
1163 "Packet [DD:RECV]: Unknown LS type %d.",
1165 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1169 if (IS_OPAQUE_LSA(lsah
->type
)
1170 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1171 flog_warn(EC_OSPF_PACKET
,
1172 "LSA[Type%d:%pI4] from %pI4: Opaque capability mismatch?",
1173 lsah
->type
, &lsah
->id
, &lsah
->adv_router
);
1174 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1178 switch (lsah
->type
) {
1179 case OSPF_AS_EXTERNAL_LSA
:
1180 case OSPF_OPAQUE_AS_LSA
:
1181 /* Check for stub area. Reject if AS-External from stub
1183 allow if from NSSA. */
1184 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1187 "Packet [DD:RECV]: LSA[Type%d:%pI4] from %s area.",
1188 lsah
->type
, &lsah
->id
,
1189 (oi
->area
->external_routing
1193 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1194 NSM_SeqNumberMismatch
);
1202 /* Create LS-request object. */
1203 new = ospf_ls_request_new(lsah
);
1205 /* Lookup received LSA, then add LS request list. */
1206 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1208 /* ospf_lsa_more_recent is fine with NULL pointers */
1209 switch (ospf_lsa_more_recent(find
, new)) {
1211 /* Neighbour has a more recent LSA, we must request it
1213 ospf_ls_request_add(nbr
, new);
1216 /* If we have a copy of this LSA, it's either less
1218 * and we're requesting it from neighbour (the case
1220 * it's as recent and we both have same copy (this
1223 * In neither of these two cases is there any point in
1224 * describing our copy of the LSA to the neighbour in a
1225 * DB-Summary packet, if we're still intending to do so.
1227 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1228 * backward compatible optimisation to OSPF DB Exchange
1230 * DB Description process implemented here.
1233 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1234 ospf_lsa_discard(new);
1237 /* We have the more recent copy, nothing specific to do:
1238 * - no need to request neighbours stale copy
1239 * - must leave DB summary list copy alone
1241 if (IS_DEBUG_OSPF_EVENT
)
1243 "Packet [DD:RECV]: LSA received Type %d, ID %pI4 is not recent.",
1244 lsah
->type
, &lsah
->id
);
1245 ospf_lsa_discard(new);
1250 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1253 /* Both sides have no More, then we're done with Exchange */
1254 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1255 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1257 ospf_db_desc_send(nbr
);
1261 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1263 /* Send DD packet in reply.
1265 * Must be done to acknowledge the Master's DD, regardless of
1266 * whether we have more LSAs ourselves to describe.
1268 * This function will clear the 'More' bit, if after this DD
1269 * we have no more LSAs to describe to the master..
1271 ospf_db_desc_send(nbr
);
1273 /* Slave can raise ExchangeDone now, if master is also done */
1274 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1275 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1278 /* Save received neighbor values from DD. */
1279 ospf_db_desc_save_current(nbr
, dd
);
1282 ospf_ls_req_send(nbr
);
1285 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1286 struct ospf_neighbor
*nbr
)
1288 /* Is DD duplicated? */
1289 if (dd
->options
== nbr
->last_recv
.options
1290 && dd
->flags
== nbr
->last_recv
.flags
1291 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1297 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1298 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1299 struct stream
*s
, struct ospf_interface
*oi
,
1302 struct ospf_db_desc
*dd
;
1303 struct ospf_neighbor
*nbr
;
1305 /* Increment statistics. */
1308 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1310 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1312 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %pI4",
1318 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1319 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1322 "Packet[DD]: Neighbor %pI4 MTU %u is larger than [%s]'s MTU %u",
1323 &nbr
->router_id
, ntohs(dd
->mtu
), IF_NAME(oi
),
1329 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1331 * required. In fact at least JunOS sends DD packets with P bit clear.
1332 * Until proper solution is developped, this hack should help.
1334 * Update: According to the RFCs, N bit is specified /only/ for Hello
1335 * options, unfortunately its use in DD options is not specified. Hence
1337 * implementations follow E-bit semantics and set it in DD options, and
1339 * treat it as unspecified and hence follow the directive "default for
1340 * options is clear", ie unset.
1342 * Reset the flag, as ospfd follows E-bit semantics.
1344 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1345 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1346 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1347 if (IS_DEBUG_OSPF_EVENT
)
1349 "Packet[DD]: Neighbour %pI4: Has NSSA capability, sends with N bit clear in DD options",
1351 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1354 #ifdef REJECT_IF_TBIT_ON
1355 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1357 * In Hello protocol, optional capability must have checked
1358 * to prevent this T-bit enabled router be my neighbor.
1360 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %pI4: T-bit on?",
1364 #endif /* REJECT_IF_TBIT_ON */
1366 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1367 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1369 * This node is not configured to handle O-bit, for now.
1370 * Clear it to ignore unsupported capability proposed by
1373 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1376 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1378 "%s:Packet[DD]: Neighbor %pI4 state is %s, seq_num:0x%x, local:0x%x",
1379 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
1380 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
1381 ntohl(dd
->dd_seqnum
), nbr
->dd_seqnum
);
1383 /* Process DD packet by neighbor status. */
1384 switch (nbr
->state
) {
1388 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1390 "Packet[DD]: Neighbor %pI4 state is %s, packet discarded.",
1392 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1396 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1397 /* If the new state is ExStart, the processing of the current
1398 packet should then continue in this new state by falling
1399 through to case ExStart below. */
1400 if (nbr
->state
!= NSM_ExStart
)
1405 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1406 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1407 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1409 /* We're Slave---obey */
1410 if (CHECK_FLAG(oi
->ospf
->config
,
1411 OSPF_LOG_ADJACENCY_DETAIL
))
1413 "Packet[DD]: Neighbor %pI4 Negotiation done (Slave).",
1416 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1419 UNSET_FLAG(nbr
->dd_flags
,
1420 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1422 /* We're Master, ignore the initial DBD from
1424 if (CHECK_FLAG(oi
->ospf
->config
,
1425 OSPF_LOG_ADJACENCY_DETAIL
))
1427 "Packet[DD]: Neighbor %pI4: Initial DBD from Slave, ignoring.",
1432 /* Ack from the Slave */
1433 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1434 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1435 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1438 "Packet[DD]: Neighbor %pI4 Negotiation done (Master).",
1440 /* Reset I, leaving MS */
1441 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1443 flog_warn(EC_OSPF_PACKET
,
1444 "Packet[DD]: Neighbor %pI4 Negotiation fails.",
1449 /* This is where the real Options are saved */
1450 nbr
->options
= dd
->options
;
1452 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1453 if (IS_DEBUG_OSPF_EVENT
)
1455 "Neighbor[%pI4] is %sOpaque-capable.",
1457 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1461 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1462 && IPV4_ADDR_SAME(&DR(oi
),
1463 &nbr
->address
.u
.prefix4
)) {
1466 "DR-neighbor[%pI4] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1468 /* This situation is undesirable, but not a real
1473 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1475 /* continue processing rest of packet. */
1476 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1479 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1480 if (IS_SET_DD_MS(nbr
->dd_flags
))
1481 /* Master: discard duplicated DD packet. */
1483 "Packet[DD] (Master): Neighbor %pI4 packet duplicated.",
1486 /* Slave: cause to retransmit the last Database
1490 "Packet[DD] [Slave]: Neighbor %pI4 packet duplicated.",
1492 ospf_db_desc_resend(nbr
);
1497 /* Otherwise DD packet should be checked. */
1498 /* Check Master/Slave bit mismatch */
1499 if (IS_SET_DD_MS(dd
->flags
)
1500 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1501 flog_warn(EC_OSPF_PACKET
,
1502 "Packet[DD]: Neighbor %pI4 MS-bit mismatch.",
1504 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1505 if (IS_DEBUG_OSPF_EVENT
)
1507 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1508 dd
->flags
, nbr
->dd_flags
);
1512 /* Check initialize bit is set. */
1513 if (IS_SET_DD_I(dd
->flags
)) {
1514 zlog_info("Packet[DD]: Neighbor %pI4 I-bit set.",
1516 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1520 /* Check DD Options. */
1521 if (dd
->options
!= nbr
->options
) {
1522 flog_warn(EC_OSPF_PACKET
,
1523 "Packet[DD]: Neighbor %pI4 options mismatch.",
1525 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1529 /* Check DD sequence number. */
1530 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1531 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1532 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1533 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1536 "Packet[DD]: Neighbor %pI4 sequence number mismatch.",
1538 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1542 /* Continue processing rest of packet. */
1543 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1547 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1548 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1549 /* Master should discard duplicate DD packet. */
1551 "Packet[DD]: Neighbor %pI4 duplicated, packet discarded.",
1555 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1556 < nbr
->v_inactivity
* 1000000LL) {
1557 /* In states Loading and Full the slave
1559 its last Database Description packet
1561 duplicate Database Description
1563 from the master. For this reason the
1565 wait RouterDeadInterval seconds
1567 last Database Description packet.
1569 Database Description packet from the
1571 this interval will generate a
1573 neighbor event. RFC2328 Section 10.8
1575 ospf_db_desc_resend(nbr
);
1581 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1584 flog_warn(EC_OSPF_PACKET
,
1585 "Packet[DD]: Neighbor %pI4 NSM illegal status %u.",
1586 &nbr
->router_id
, nbr
->state
);
1591 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1593 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1594 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1595 struct stream
*s
, struct ospf_interface
*oi
,
1598 struct ospf_neighbor
*nbr
;
1600 struct in_addr ls_id
;
1601 struct in_addr adv_router
;
1602 struct ospf_lsa
*find
;
1603 struct list
*ls_upd
;
1604 unsigned int length
;
1606 /* Increment statistics. */
1609 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1611 flog_warn(EC_OSPF_PACKET
,
1612 "Link State Request: Unknown Neighbor %pI4",
1617 /* Neighbor State should be Exchange or later. */
1618 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1619 && nbr
->state
!= NSM_Full
) {
1622 "Link State Request received from %pI4: Neighbor state is %s, packet discarded.",
1624 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1628 /* Send Link State Update for ALL requested LSAs. */
1629 ls_upd
= list_new();
1630 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1632 while (size
>= OSPF_LSA_KEY_SIZE
) {
1633 /* Get one slice of Link State Request. */
1634 ls_type
= stream_getl(s
);
1635 ls_id
.s_addr
= stream_get_ipv4(s
);
1636 adv_router
.s_addr
= stream_get_ipv4(s
);
1638 /* Verify LSA type. */
1639 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1640 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1641 list_delete(&ls_upd
);
1645 /* Search proper LSA in LSDB. */
1646 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1649 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1650 list_delete(&ls_upd
);
1654 /* Packet overflows MTU size, send immediately. */
1655 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1656 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1657 ospf_ls_upd_send(nbr
, ls_upd
,
1658 OSPF_SEND_PACKET_DIRECT
, 0);
1660 ospf_ls_upd_send(nbr
, ls_upd
,
1661 OSPF_SEND_PACKET_INDIRECT
, 0);
1663 /* Only remove list contents. Keep ls_upd. */
1664 list_delete_all_node(ls_upd
);
1666 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1669 /* Append LSA to update list. */
1670 listnode_add(ls_upd
, find
);
1671 length
+= ntohs(find
->data
->length
);
1673 size
-= OSPF_LSA_KEY_SIZE
;
1676 /* Send rest of Link State Update. */
1677 if (listcount(ls_upd
) > 0) {
1678 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1679 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1682 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1685 list_delete(&ls_upd
);
1687 list_delete(&ls_upd
);
1690 /* Get the list of LSAs from Link State Update packet.
1691 And process some validation -- RFC2328 Section 13. (1)-(2). */
1692 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1694 struct ospf_interface
*oi
, size_t size
)
1696 uint16_t count
, sum
;
1698 struct lsa_header
*lsah
;
1699 struct ospf_lsa
*lsa
;
1704 count
= stream_getl(s
);
1705 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1707 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1708 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1709 lsah
= (struct lsa_header
*)stream_pnt(s
);
1710 length
= ntohs(lsah
->length
);
1712 if (length
> size
) {
1715 "Link State Update: LSA length exceeds packet size.");
1719 if (length
< OSPF_LSA_HEADER_SIZE
) {
1720 flog_warn(EC_OSPF_PACKET
,
1721 "Link State Update: LSA length too small.");
1725 /* Validate the LSA's LS checksum. */
1726 sum
= lsah
->checksum
;
1727 if (!ospf_lsa_checksum_valid(lsah
)) {
1728 /* (bug #685) more details in a one-line message make it
1730 * to identify problem source on the one hand and to
1732 * chance to compress repeated messages in syslog on the
1736 "Link State Update: LSA checksum error %x/%x, ID=%pI4 from: nbr %pI4, router ID %pI4, adv router %pI4",
1737 sum
, lsah
->checksum
, &lsah
->id
,
1738 &nbr
->src
, &nbr
->router_id
,
1743 /* Examine the LSA's LS type. */
1744 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1745 flog_warn(EC_OSPF_PACKET
,
1746 "Link State Update: Unknown LS type %d",
1752 * What if the received LSA's age is greater than MaxAge?
1753 * Treat it as a MaxAge case -- endo.
1755 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1756 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1758 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1759 #ifdef STRICT_OBIT_USAGE_CHECK
1760 if ((IS_OPAQUE_LSA(lsah
->type
)
1761 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1762 || (!IS_OPAQUE_LSA(lsah
->type
)
1763 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1765 * This neighbor must know the exact usage of
1767 * the bit will be set in Type-9,10,11 LSAs
1770 flog_warn(EC_OSPF_PACKET
,
1771 "LSA[Type%d:%pI4]: O-bit abuse?",
1772 lsah
->type
, &lsah
->id
);
1775 #endif /* STRICT_OBIT_USAGE_CHECK */
1777 /* Do not take in AS External Opaque-LSAs if we are a
1779 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1780 && nbr
->oi
->area
->external_routing
1781 != OSPF_AREA_DEFAULT
) {
1782 if (IS_DEBUG_OSPF_EVENT
)
1784 "LSA[Type%d:%pI4]: We are a stub, don't take this LSA.",
1789 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1792 "LSA[Type%d:%pI4] from %pI4: Opaque capability mismatch?",
1793 lsah
->type
, &lsah
->id
, &lsah
->adv_router
);
1797 /* Create OSPF LSA instance. */
1798 lsa
= ospf_lsa_new_and_data(length
);
1800 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1801 /* We may wish to put some error checking if type NSSA comes in
1802 and area not in NSSA mode */
1803 switch (lsah
->type
) {
1804 case OSPF_AS_EXTERNAL_LSA
:
1805 case OSPF_OPAQUE_AS_LSA
:
1808 case OSPF_OPAQUE_LINK_LSA
:
1809 lsa
->oi
= oi
; /* Remember incoming interface for
1810 flooding control. */
1813 lsa
->area
= oi
->area
;
1817 memcpy(lsa
->data
, lsah
, length
);
1819 if (IS_DEBUG_OSPF_EVENT
)
1821 "LSA[Type%d:%pI4]: %p new LSA created with Link State Update",
1822 lsa
->data
->type
, &lsa
->data
->id
,
1824 listnode_add(lsas
, lsa
);
1830 /* Cleanup Update list. */
1831 static void ospf_upd_list_clean(struct list
*lsas
)
1833 struct listnode
*node
, *nnode
;
1834 struct ospf_lsa
*lsa
;
1836 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1837 ospf_lsa_discard(lsa
);
1842 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1843 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1844 struct ospf_header
*ospfh
, struct stream
*s
,
1845 struct ospf_interface
*oi
, uint16_t size
)
1847 struct ospf_neighbor
*nbr
;
1849 struct listnode
*node
, *nnode
;
1850 struct ospf_lsa
*lsa
= NULL
;
1851 /* unsigned long ls_req_found = 0; */
1853 /* Dis-assemble the stream, update each entry, re-encapsulate for
1856 /* Increment statistics. */
1859 /* Check neighbor. */
1860 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1862 flog_warn(EC_OSPF_PACKET
,
1863 "Link State Update: Unknown Neighbor %pI4 on int: %s",
1864 &ospfh
->router_id
, IF_NAME(oi
));
1868 /* Check neighbor state. */
1869 if (nbr
->state
< NSM_Exchange
) {
1870 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1872 "Link State Update: Neighbor[%pI4] state %s is less than Exchange",
1874 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1879 /* Get list of LSAs from Link State Update packet. - Also performs
1880 * Stages 1 (validate LSA checksum) and 2 (check for LSA consistent
1881 * type) of section 13.
1883 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1887 #define DISCARD_LSA(L, N) \
1889 if (IS_DEBUG_OSPF_EVENT) \
1891 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1893 N, (void *)lsa, (int)lsa->data->type); \
1894 ospf_lsa_discard(L); \
1898 /* Process each LSA received in the one packet.
1900 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1901 * text below are from the steps in RFC 2328, Section 13.
1903 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1904 struct ospf_lsa
*ls_ret
, *current
;
1907 if (IS_DEBUG_OSPF(lsa
, LSA
))
1908 zlog_debug("LSA Type-%d from %pI4, ID: %pI4, ADV: %pI4",
1909 lsa
->data
->type
, &ospfh
->router_id
,
1910 &lsa
->data
->id
, &lsa
->data
->adv_router
);
1912 listnode_delete(lsas
,
1913 lsa
); /* We don't need it in list anymore */
1915 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1918 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1920 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1923 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1926 /* Do take in Type-7's if we are an NSSA */
1928 /* If we are also an ABR, later translate them to a Type-5
1931 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1932 translate them to a separate Type-5 packet. */
1934 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1935 /* Reject from STUB or NSSA */
1936 if (nbr
->oi
->area
->external_routing
1937 != OSPF_AREA_DEFAULT
) {
1938 if (IS_DEBUG_OSPF_NSSA
)
1940 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1941 DISCARD_LSA(lsa
, 1);
1944 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1945 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1946 if (IS_DEBUG_OSPF_NSSA
)
1948 "Incoming NSSA LSA Discarded: Not NSSA Area");
1949 DISCARD_LSA(lsa
, 2);
1952 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1953 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1954 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1955 &lsa
->data
->adv_router
)) {
1957 EC_OSPF_ROUTER_LSA_MISMATCH
,
1958 "Incoming Router-LSA from %pI4 with Adv-ID[%pI4] != LS-ID[%pI4]",
1959 &ospfh
->router_id
, &lsa
->data
->id
,
1960 &lsa
->data
->adv_router
);
1962 EC_OSPF_DOMAIN_CORRUPT
,
1963 "OSPF domain compromised by attack or corruption. Verify correct operation of -ALL- OSPF routers.");
1964 DISCARD_LSA(lsa
, 0);
1967 /* Find the LSA in the current database. */
1969 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1971 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1973 no instance of the LSA in the router's link state database,
1974 and none of router's neighbors are in states Exchange or
1976 then take the following actions: */
1978 if (IS_LSA_MAXAGE(lsa
) && !current
1979 && ospf_check_nbr_status(oi
->ospf
)) {
1980 /* (4a) Response Link State Acknowledgment. */
1981 ospf_ls_ack_send(nbr
, lsa
);
1983 /* (4b) Discard LSA. */
1984 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1986 "Link State Update[%s]: LS age is equal to MaxAge.",
1989 DISCARD_LSA(lsa
, 3);
1992 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1993 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1994 &oi
->ospf
->router_id
)) {
1996 * Even if initial flushing seems to be completed, there
1998 * be a case that self-originated LSA with MaxAge still
2000 * in the routing domain.
2001 * Just send an LSAck message to cease retransmission.
2003 if (IS_LSA_MAXAGE(lsa
)) {
2004 zlog_info("LSA[%s]: Boomerang effect?",
2006 ospf_ls_ack_send(nbr
, lsa
);
2007 ospf_lsa_discard(lsa
);
2009 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2010 ospf_opaque_lsa_refresh_schedule(
2016 * If an instance of self-originated Opaque-LSA is not
2018 * in the LSDB, there are some possible cases here.
2020 * 1) This node lost opaque-capability after restart.
2021 * 2) Else, a part of opaque-type is no more supported.
2022 * 3) Else, a part of opaque-id is no more supported.
2024 * Anyway, it is still this node's responsibility to
2026 * Otherwise, the LSA instance remains in the routing
2028 * until its age reaches to MaxAge.
2030 /* XXX: We should deal with this for *ALL* LSAs, not
2032 if (current
== NULL
) {
2033 if (IS_DEBUG_OSPF_EVENT
)
2035 "LSA[%s]: Previously originated Opaque-LSA,not found in the LSDB.",
2038 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2040 ospf_ls_ack_send(nbr
, lsa
);
2042 if (!ospf
->gr_info
.restart_in_progress
) {
2043 ospf_opaque_self_originated_lsa_received(
2050 /* It might be happen that received LSA is self-originated
2052 * router ID is changed. So, we should check if LSA is a
2054 * Link State ID is one of the router's own IP interface
2055 * addresses but whose
2056 * Advertising Router is not equal to the router's own Router ID
2057 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2061 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2062 struct listnode
*oinode
, *oinnode
;
2063 struct ospf_interface
*out_if
;
2066 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2071 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2073 && (!(IPV4_ADDR_SAME(
2074 &oi
->ospf
->router_id
,
2075 &lsa
->data
->adv_router
)))) {
2076 if (out_if
->network_lsa_self
) {
2077 ospf_lsa_flush_area(
2079 if (IS_DEBUG_OSPF_EVENT
)
2081 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2085 ospf_lsa_discard(lsa
);
2095 /* (5) Find the instance of this LSA that is currently contained
2096 in the router's link state database. If there is no
2097 database copy, or the received LSA is more recent than
2098 the database copy the following steps must be performed.
2099 (The sub steps from RFC 2328 section 13 step (5) will be
2104 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2106 if (current
&& (IS_LSA_MAX_SEQ(current
))
2107 && (IS_LSA_MAX_SEQ(lsa
)) && !IS_LSA_MAXAGE(lsa
)) {
2109 "Link State Update[%s]: has Max Seq and higher checksum but not MaxAge. Dropping it",
2112 DISCARD_LSA(lsa
, 4);
2115 /* Actual flooding procedure. */
2116 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2117 < 0) /* Trap NSSA later. */
2118 DISCARD_LSA(lsa
, 5);
2122 /* (6) Else, If there is an instance of the LSA on the sending
2123 neighbor's Link state request list, an error has occurred in
2124 the Database Exchange process. In this case, restart the
2125 Database Exchange process by generating the neighbor event
2126 BadLSReq for the sending neighbor and stop processing the
2127 Link State Update packet. */
2129 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2130 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2133 "LSA[%s] instance exists on Link state request list",
2136 /* Clean list of LSAs. */
2137 ospf_upd_list_clean(lsas
);
2138 /* this lsa is not on lsas list already. */
2139 ospf_lsa_discard(lsa
);
2143 /* If the received LSA is the same instance as the database copy
2144 (i.e., neither one is more recent) the following two steps
2145 should be performed: */
2148 /* If the LSA is listed in the Link state retransmission
2150 for the receiving adjacency, the router itself is
2152 an acknowledgment for this LSA. The router should
2154 received LSA as an acknowledgment by removing the LSA
2156 the Link state retransmission list. This is termed
2158 "implied acknowledgment". */
2160 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2162 if (ls_ret
!= NULL
) {
2163 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2165 /* Delayed acknowledgment sent if advertisement
2167 from Designated Router, otherwise do nothing.
2169 if (oi
->state
== ISM_Backup
)
2173 ospf_lsa_lock(lsa
));
2175 DISCARD_LSA(lsa
, 6);
2177 /* Acknowledge the receipt of the LSA by sending a
2178 Link State Acknowledgment packet back out the
2182 ospf_ls_ack_send(nbr
, lsa
);
2183 DISCARD_LSA(lsa
, 7);
2187 /* The database copy is more recent. If the database copy
2188 has LS age equal to MaxAge and LS sequence number equal to
2189 MaxSequenceNumber, simply discard the received LSA without
2190 acknowledging it. (In this case, the LSA's LS sequence number
2192 wrapping, and the MaxSequenceNumber LSA must be completely
2193 flushed before any new LSA instance can be introduced). */
2195 else if (ret
> 0) /* Database copy is more recent */
2197 if (IS_LSA_MAXAGE(current
)
2198 && current
->data
->ls_seqnum
2199 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2200 DISCARD_LSA(lsa
, 8);
2202 /* Otherwise, as long as the database copy has not been
2204 Link State Update within the last MinLSArrival
2206 database copy back to the sending neighbor,
2208 a Link State Update Packet. The Link State Update
2210 be sent directly to the neighbor. In so doing, do not
2212 database copy of the LSA on the neighbor's link state
2213 retransmission list, and do not acknowledge the
2215 recent) LSA instance. */
2217 if (monotime_since(¤t
->tv_orig
, NULL
)
2218 >= ospf
->min_ls_arrival
* 1000LL)
2219 /* Trap NSSA type later.*/
2220 ospf_ls_upd_send_lsa(
2222 OSPF_SEND_PACKET_DIRECT
);
2223 DISCARD_LSA(lsa
, 9);
2229 assert(listcount(lsas
) == 0);
2232 if (ospf
->gr_info
.restart_in_progress
)
2233 ospf_gr_check_lsdb_consistency(oi
->ospf
, oi
->area
);
2236 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2237 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2238 struct stream
*s
, struct ospf_interface
*oi
,
2241 struct ospf_neighbor
*nbr
;
2243 /* increment statistics. */
2246 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2248 flog_warn(EC_OSPF_PACKET
,
2249 "Link State Acknowledgment: Unknown Neighbor %pI4",
2254 if (nbr
->state
< NSM_Exchange
) {
2255 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2257 "Link State Acknowledgment: Neighbor[%pI4] state %s is less than Exchange",
2259 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2264 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2265 struct ospf_lsa
*lsa
, *lsr
;
2267 lsa
= ospf_lsa_new();
2268 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2269 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2271 /* lsah = (struct lsa_header *) stream_pnt (s); */
2272 size
-= OSPF_LSA_HEADER_SIZE
;
2273 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2275 if (lsa
->data
->type
< OSPF_MIN_LSA
2276 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2278 ospf_lsa_discard(lsa
);
2282 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2284 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0) {
2285 ospf_ls_retransmit_delete(nbr
, lsr
);
2286 ospf_check_and_gen_init_seq_lsa(oi
, lsa
);
2290 ospf_lsa_discard(lsa
);
2296 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2297 struct interface
**ifp
,
2298 struct stream
*ibuf
)
2303 ifindex_t ifindex
= 0;
2305 /* Header and data both require alignment. */
2306 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2309 memset(&msgh
, 0, sizeof(msgh
));
2310 msgh
.msg_iov
= &iov
;
2311 msgh
.msg_iovlen
= 1;
2312 msgh
.msg_control
= (caddr_t
)buff
;
2313 msgh
.msg_controllen
= sizeof(buff
);
2315 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, MSG_DONTWAIT
,
2316 OSPF_MAX_PACKET_SIZE
+ 1);
2318 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
)
2319 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2320 safe_strerror(errno
));
2323 if ((unsigned int)ret
< sizeof(struct ip
)) {
2326 "%s: discarding runt packet of length %d (ip header size is %u)",
2327 __func__
, ret
, (unsigned int)sizeof(iph
));
2331 /* Note that there should not be alignment problems with this assignment
2332 because this is at the beginning of the stream data buffer. */
2333 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2334 sockopt_iphdrincl_swab_systoh(iph
);
2336 ip_len
= iph
->ip_len
;
2338 #if defined(__FreeBSD__) && (__FreeBSD_version < 1000000)
2340 * Kernel network code touches incoming IP header parameters,
2341 * before protocol specific processing.
2343 * 1) Convert byteorder to host representation.
2344 * --> ip_len, ip_id, ip_off
2346 * 2) Adjust ip_len to strip IP header size!
2347 * --> If user process receives entire IP packet via RAW
2348 * socket, it must consider adding IP header size to
2349 * the "ip_len" field of "ip" structure.
2351 * For more details, see <netinet/ip_input.c>.
2353 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2356 #if defined(__DragonFly__)
2358 * in DragonFly's raw socket, ip_len/ip_off are read
2359 * in network byte order.
2360 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2362 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2365 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2367 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2369 if (ret
!= ip_len
) {
2372 "%s read length mismatch: ip_len is %d, but recvmsg returned %d",
2373 __func__
, ip_len
, ret
);
2377 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2378 zlog_debug("%s: fd %d(%s) on interface %d(%s)", __func__
, fd
,
2379 ospf_get_name(ospf
), ifindex
,
2380 *ifp
? (*ifp
)->name
: "Unknown");
2384 static struct ospf_interface
*
2385 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2386 struct ip
*iph
, struct ospf_header
*ospfh
)
2388 struct ospf_interface
*rcv_oi
;
2389 struct ospf_vl_data
*vl_data
;
2390 struct ospf_area
*vl_area
;
2391 struct listnode
*node
;
2393 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2394 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2397 /* look for local OSPF interface matching the destination
2398 * to determine Area ID. We presume therefore the destination address
2399 * is unique, or at least (for "unnumbered" links), not used in other
2402 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2406 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2408 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2412 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2413 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2414 if (IS_DEBUG_OSPF_EVENT
)
2415 zlog_debug("associating packet with %s",
2416 IF_NAME(vl_data
->vl_oi
));
2417 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2418 if (IS_DEBUG_OSPF_EVENT
)
2420 "This VL is not up yet, sorry");
2424 return vl_data
->vl_oi
;
2428 if (IS_DEBUG_OSPF_EVENT
)
2429 zlog_debug("couldn't find any VL to associate the packet with");
2434 static int ospf_check_area_id(struct ospf_interface
*oi
,
2435 struct ospf_header
*ospfh
)
2437 /* Check match the Area ID of the receiving interface. */
2438 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2444 /* Unbound socket will accept any Raw IP packets if proto is matched.
2445 To prevent it, compare src IP address and i/f address with masking
2446 i/f network mask. */
2447 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2448 struct in_addr ip_src
)
2450 struct in_addr mask
, me
, him
;
2452 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2453 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2456 /* Ignore mask check for max prefix length (32) */
2457 if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
2458 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
)
2461 masklen2ip(oi
->address
->prefixlen
, &mask
);
2463 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2464 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2466 if (IPV4_ADDR_SAME(&me
, &him
))
2472 /* Return 1, if the packet is properly authenticated and checksummed,
2473 0 otherwise. In particular, check that AuType header field is valid and
2474 matches the locally configured AuType, and that D.5 requirements are met. */
2475 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2477 struct crypt_key
*ck
;
2478 uint16_t iface_auth_type
;
2479 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2481 switch (pkt_auth_type
) {
2482 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2483 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2484 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2487 "interface %s: auth-type mismatch, local %s, rcvd Null",
2489 lookup_msg(ospf_auth_type_str
,
2490 iface_auth_type
, NULL
));
2493 if (!ospf_check_sum(ospfh
)) {
2494 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2497 "interface %s: Null auth OK, but checksum error, Router-ID %pI4",
2503 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2504 if (OSPF_AUTH_SIMPLE
2505 != (iface_auth_type
= ospf_auth_type(oi
))) {
2506 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2509 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2511 lookup_msg(ospf_auth_type_str
,
2512 iface_auth_type
, NULL
));
2515 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2516 OSPF_AUTH_SIMPLE_SIZE
)) {
2517 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2518 flog_warn(EC_OSPF_PACKET
,
2519 "interface %s: Simple auth failed",
2523 if (!ospf_check_sum(ospfh
)) {
2524 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2527 "interface %s: Simple auth OK, checksum error, Router-ID %pI4",
2533 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2534 if (OSPF_AUTH_CRYPTOGRAPHIC
2535 != (iface_auth_type
= ospf_auth_type(oi
))) {
2536 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2539 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2541 lookup_msg(ospf_auth_type_str
,
2542 iface_auth_type
, NULL
));
2545 if (ospfh
->checksum
) {
2546 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2549 "interface %s: OSPF header checksum is not 0",
2553 /* only MD5 crypto method can pass ospf_packet_examin() */
2554 if (NULL
== (ck
= listgetdata(
2555 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2556 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2557 /* Condition above uses the last key ID on the list,
2559 different from what ospf_crypt_key_lookup() does. A
2561 !ospf_check_md5_digest(oi
, ospfh
)) {
2562 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2563 flog_warn(EC_OSPF_MD5
,
2564 "interface %s: MD5 auth failed",
2570 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2573 "interface %s: invalid packet auth-type (%02x)",
2574 IF_NAME(oi
), pkt_auth_type
);
2579 static int ospf_check_sum(struct ospf_header
*ospfh
)
2584 /* clear auth_data for checksum. */
2585 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2587 /* keep checksum and clear. */
2588 sum
= ospfh
->checksum
;
2589 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2591 /* calculate checksum. */
2592 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2595 zlog_info("%s: checksum mismatch, my %X, his %X", __func__
, ret
,
2603 /* Verify, that given link/TOS records are properly sized/aligned and match
2604 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2605 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2607 const uint16_t num_links
)
2609 unsigned counted_links
= 0, thislinklen
;
2611 while (linkbytes
>= OSPF_ROUTER_LSA_LINK_SIZE
) {
2613 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2614 if (thislinklen
> linkbytes
) {
2615 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2616 zlog_debug("%s: length error in link block #%u",
2617 __func__
, counted_links
);
2620 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2621 linkbytes
-= thislinklen
;
2624 if (counted_links
!= num_links
) {
2625 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2626 zlog_debug("%s: %u link blocks declared, %u present",
2627 __func__
, num_links
, counted_links
);
2633 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2634 minimum length constraint). */
2635 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2636 const uint8_t headeronly
)
2639 struct router_lsa
*rlsa
;
2640 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2641 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2642 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2643 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2644 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2648 switch (lsah
->type
) {
2649 case OSPF_ROUTER_LSA
: {
2651 * RFC2328 A.4.2, LSA header + 4 bytes followed by N>=0
2652 * (12+)-byte link blocks
2654 size_t linkbytes_len
= lsalen
- OSPF_LSA_HEADER_SIZE
2655 - OSPF_ROUTER_LSA_MIN_SIZE
;
2658 * LSA link blocks are variable length but always multiples of
2659 * 4; basic sanity check
2661 if (linkbytes_len
% 4 != 0)
2667 rlsa
= (struct router_lsa
*)lsah
;
2669 ret
= ospf_router_lsa_links_examin(
2670 (struct router_lsa_link
*)rlsa
->link
,
2672 ntohs(rlsa
->links
));
2675 case OSPF_AS_EXTERNAL_LSA
:
2676 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2678 case OSPF_AS_NSSA_LSA
:
2679 /* RFC3101 C, idem */
2680 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2681 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2686 /* Following LSA types are considered OK length-wise as soon as their
2688 * length constraint is met and length of the whole LSA is a multiple of
2690 * (basic LSA header size is already a multiple of 4). */
2691 case OSPF_NETWORK_LSA
:
2692 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2693 case OSPF_SUMMARY_LSA
:
2694 case OSPF_ASBR_SUMMARY_LSA
:
2695 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2697 case OSPF_OPAQUE_LINK_LSA
:
2698 case OSPF_OPAQUE_AREA_LSA
:
2699 case OSPF_OPAQUE_AS_LSA
:
2700 /* RFC5250 A.2, "some number of octets (of application-specific
2701 * data) padded to 32-bit alignment." This is considered
2703 * to 4-byte alignment of all other LSA types, see
2704 * OSPF-ALIGNMENT.txt
2705 * file for the detailed analysis of this passage. */
2706 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2709 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2710 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2714 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2715 zlog_debug("%s: alignment error in %s", __func__
,
2716 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2720 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2721 includes verification of LSA blocks length/alignment and dispatching
2722 of deeper-level checks. */
2724 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2725 size_t length
, const uint8_t headeronly
,
2726 /* When declared_num_lsas is not 0, compare it to the real
2728 and treat the difference as an error. */
2729 const uint32_t declared_num_lsas
)
2731 uint32_t counted_lsas
= 0;
2735 if (length
< OSPF_LSA_HEADER_SIZE
) {
2736 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2738 "%s: undersized (%zu B) trailing (#%u) LSA header",
2739 __func__
, length
, counted_lsas
);
2742 /* save on ntohs() calls here and in the LSA validator */
2743 lsalen
= ntohs(lsah
->length
);
2744 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2745 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2747 "%s: malformed LSA header #%u, declared length is %u B",
2748 __func__
, counted_lsas
, lsalen
);
2752 /* less checks here and in ospf_lsa_examin() */
2753 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2754 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2756 "%s: malformed header-only LSA #%u",
2757 __func__
, counted_lsas
);
2760 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2761 + OSPF_LSA_HEADER_SIZE
);
2762 length
-= OSPF_LSA_HEADER_SIZE
;
2764 /* make sure the input buffer is deep enough before
2766 if (lsalen
> length
) {
2767 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2769 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2770 __func__
, counted_lsas
, lsalen
,
2774 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2775 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2776 zlog_debug("%s: malformed LSA #%u",
2777 __func__
, counted_lsas
);
2780 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2786 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2787 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2789 "%s: #LSAs declared (%u) does not match actual (%u)",
2790 __func__
, declared_num_lsas
, counted_lsas
);
2796 /* Verify a complete OSPF packet for proper sizing/alignment. */
2797 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2798 const unsigned bytesonwire
)
2800 uint16_t bytesdeclared
, bytesauth
;
2802 struct ospf_ls_update
*lsupd
;
2804 /* Length, 1st approximation. */
2805 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2806 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2807 zlog_debug("%s: undersized (%u B) packet", __func__
,
2811 /* Now it is safe to access header fields. Performing length check,
2813 * for possible extra bytes of crypto auth/padding, which are not
2815 * in the OSPF header "length" field. */
2816 if (oh
->version
!= OSPF_VERSION
) {
2817 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2818 zlog_debug("%s: invalid (%u) protocol version",
2819 __func__
, oh
->version
);
2822 bytesdeclared
= ntohs(oh
->length
);
2823 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2826 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2827 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2829 "%s: unsupported crypto auth length (%u B)",
2830 __func__
, oh
->u
.crypt
.auth_data_len
);
2833 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2835 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2836 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2838 "%s: packet length error (%u real, %u+%u declared)",
2839 __func__
, bytesonwire
, bytesdeclared
,
2843 /* Length, 2nd approximation. The type-specific constraint is checked
2844 against declared length, not amount of bytes on wire. */
2845 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2847 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2848 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2849 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2851 lookup_msg(ospf_packet_type_str
, oh
->type
,
2856 case OSPF_MSG_HELLO
:
2857 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2859 by N>=0 router-IDs. */
2860 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2865 case OSPF_MSG_DB_DESC
:
2866 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2868 by N>=0 header-only LSAs. */
2869 ret
= ospf_lsaseq_examin(
2870 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2871 + OSPF_DB_DESC_MIN_SIZE
),
2872 bytesdeclared
- OSPF_HEADER_SIZE
2873 - OSPF_DB_DESC_MIN_SIZE
,
2874 1, /* header-only LSAs */
2877 case OSPF_MSG_LS_REQ
:
2878 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2879 * request blocks. */
2880 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2885 case OSPF_MSG_LS_UPD
:
2886 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2888 by N>=0 full LSAs (with N declared beforehand). */
2889 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2890 + OSPF_HEADER_SIZE
);
2891 ret
= ospf_lsaseq_examin(
2892 (struct lsa_header
*)((caddr_t
)lsupd
2893 + OSPF_LS_UPD_MIN_SIZE
),
2894 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2896 ntohl(lsupd
->num_lsas
) /* 32 bits */
2899 case OSPF_MSG_LS_ACK
:
2900 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2902 ret
= ospf_lsaseq_examin(
2903 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2904 + OSPF_LS_ACK_MIN_SIZE
),
2905 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2906 1, /* header-only LSAs */
2910 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2911 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2915 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2916 zlog_debug("%s: malformed %s packet", __func__
,
2917 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2921 /* OSPF Header verification. */
2922 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2923 struct ip
*iph
, struct ospf_header
*ospfh
)
2925 /* Check Area ID. */
2926 if (!ospf_check_area_id(oi
, ospfh
)) {
2927 flog_warn(EC_OSPF_PACKET
,
2928 "interface %s: ospf_read invalid Area ID %pI4",
2929 IF_NAME(oi
), &ospfh
->area_id
);
2933 /* Check network mask, Silently discarded. */
2934 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2937 "interface %s: ospf_read network address is not same [%pI4]",
2938 IF_NAME(oi
), &iph
->ip_src
);
2942 /* Check authentication. The function handles logging actions, where
2944 if (!ospf_check_auth(oi
, ospfh
))
2950 enum ospf_read_return_enum
{
2955 static enum ospf_read_return_enum
ospf_read_helper(struct ospf
*ospf
)
2958 struct stream
*ibuf
;
2959 struct ospf_interface
*oi
;
2961 struct ospf_header
*ospfh
;
2963 struct connected
*c
;
2964 struct interface
*ifp
= NULL
;
2966 stream_reset(ospf
->ibuf
);
2967 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2969 return OSPF_READ_ERROR
;
2972 * This raw packet is known to be at least as big as its
2973 * IP header. Note that there should not be alignment problems with
2974 * this assignment because this is at the beginning of the
2975 * stream data buffer.
2977 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2979 * Note that sockopt_iphdrincl_swab_systoh was called in
2984 * Handle cases where the platform does not support
2985 * retrieving the ifindex, and also platforms (such as
2986 * Solaris 8) that claim to support ifindex retrieval but do
2989 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2994 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2996 "%s: Unable to determine incoming interface from: %pI4(%s)",
2997 __func__
, &iph
->ip_src
,
2998 ospf_get_name(ospf
));
2999 return OSPF_READ_CONTINUE
;
3003 if (ospf
->vrf_id
== VRF_DEFAULT
&& ospf
->vrf_id
!= ifp
->vrf
->vrf_id
) {
3005 * We may have a situation where l3mdev_accept == 1
3006 * let's just kindly drop the packet and move on.
3007 * ospf really really really does not like when
3008 * we receive the same packet multiple times.
3010 return OSPF_READ_CONTINUE
;
3013 /* Self-originated packet should be discarded silently. */
3014 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
3015 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
3017 "ospf_read[%pI4]: Dropping self-originated packet",
3020 return OSPF_READ_CONTINUE
;
3023 /* Check that we have enough for an IP header */
3024 if ((unsigned int)(iph
->ip_hl
<< 2) >= STREAM_READABLE(ibuf
)) {
3025 if ((unsigned int)(iph
->ip_hl
<< 2) == STREAM_READABLE(ibuf
)) {
3028 "Rx'd IP packet with OSPF protocol number but no payload");
3032 "IP header length field claims header is %u bytes, but we only have %zu",
3033 (unsigned int)(iph
->ip_hl
<< 2),
3034 STREAM_READABLE(ibuf
));
3037 return OSPF_READ_ERROR
;
3039 stream_forward_getp(ibuf
, iph
->ip_hl
<< 2);
3041 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3043 != ospf_packet_examin(ospfh
, stream_get_endp(ibuf
)
3044 - stream_get_getp(ibuf
)))
3045 return OSPF_READ_CONTINUE
;
3046 /* Now it is safe to access all fields of OSPF packet header. */
3048 /* associate packet with ospf interface */
3049 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3052 * ospf_verify_header() relies on a valid "oi" and thus can be called
3053 * only after the passive/backbone/other checks below are passed.
3054 * These checks in turn access the fields of unverified "ospfh"
3055 * structure for their own purposes and must remain very accurate
3059 /* If incoming interface is passive one, ignore it. */
3060 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3061 if (IS_DEBUG_OSPF_EVENT
)
3063 "ignoring packet from router %pI4 sent to %pI4, received on a passive interface, %pI4",
3064 &ospfh
->router_id
, &iph
->ip_dst
,
3065 &oi
->address
->u
.prefix4
);
3067 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3068 /* Try to fix multicast membership.
3069 * Some OS:es may have problems in this area,
3070 * make sure it is removed.
3072 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3073 ospf_if_set_multicast(oi
);
3075 return OSPF_READ_CONTINUE
;
3079 /* if no local ospf_interface,
3080 * or header area is backbone but ospf_interface is not
3081 * check for VLINK interface
3084 || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3085 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3086 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3088 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3090 "Packet from [%pI4] received on link %s but no ospf_interface",
3091 &iph
->ip_src
, ifp
->name
);
3092 return OSPF_READ_CONTINUE
;
3097 * else it must be a local ospf interface, check it was
3098 * received on correct link
3100 else if (oi
->ifp
!= ifp
) {
3101 if (IS_DEBUG_OSPF_EVENT
)
3102 flog_warn(EC_OSPF_PACKET
,
3103 "Packet from [%pI4] received on wrong link %s",
3104 &iph
->ip_src
, ifp
->name
);
3105 return OSPF_READ_CONTINUE
;
3106 } else if (oi
->state
== ISM_Down
) {
3109 "Ignoring packet from %pI4 to %pI4 received on interface that is down [%s]; interface flags are %s",
3110 &iph
->ip_src
, &iph
->ip_dst
, ifp
->name
,
3111 if_flag_dump(ifp
->flags
));
3112 /* Fix multicast memberships? */
3113 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3114 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3115 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3116 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3117 if (oi
->multicast_memberships
)
3118 ospf_if_set_multicast(oi
);
3119 return OSPF_READ_CONTINUE
;
3123 * If the received packet is destined for AllDRouters, the
3124 * packet should be accepted only if the received ospf
3125 * interface state is either DR or Backup -- endo.
3127 * I wonder who endo is?
3129 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3130 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3133 "Dropping packet for AllDRouters from [%pI4] via [%s] (ISM: %s)",
3134 &iph
->ip_src
, IF_NAME(oi
),
3135 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3136 /* Try to fix multicast membership. */
3137 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3138 ospf_if_set_multicast(oi
);
3139 return OSPF_READ_CONTINUE
;
3142 /* Verify more OSPF header fields. */
3143 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3145 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3147 "ospf_read[%pI4]: Header check failed, dropping.",
3149 return OSPF_READ_CONTINUE
;
3152 /* Show debug receiving packet. */
3153 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3154 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3156 "-----------------------------------------------------");
3157 ospf_packet_dump(ibuf
);
3160 zlog_debug("%s received from [%pI4] via [%s]",
3161 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3162 &ospfh
->router_id
, IF_NAME(oi
));
3163 zlog_debug(" src [%pI4],", &iph
->ip_src
);
3164 zlog_debug(" dst [%pI4]", &iph
->ip_dst
);
3166 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3168 "-----------------------------------------------------");
3171 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3173 /* Adjust size to message length. */
3174 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3176 /* Read rest of the packet and call each sort of packet routine.
3178 switch (ospfh
->type
) {
3179 case OSPF_MSG_HELLO
:
3180 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3182 case OSPF_MSG_DB_DESC
:
3183 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3185 case OSPF_MSG_LS_REQ
:
3186 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3188 case OSPF_MSG_LS_UPD
:
3189 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3191 case OSPF_MSG_LS_ACK
:
3192 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3197 "interface %s(%s): OSPF packet header type %d is illegal",
3198 IF_NAME(oi
), ospf_get_name(ospf
), ospfh
->type
);
3202 return OSPF_READ_CONTINUE
;
3205 /* Starting point of packet process function. */
3206 void ospf_read(struct thread
*thread
)
3210 enum ospf_read_return_enum ret
;
3212 /* first of all get interface pointer. */
3213 ospf
= THREAD_ARG(thread
);
3215 /* prepare for next packet. */
3216 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
3218 while (count
< ospf
->write_oi_count
) {
3220 ret
= ospf_read_helper(ospf
);
3222 case OSPF_READ_ERROR
:
3224 case OSPF_READ_CONTINUE
:
3230 /* Make OSPF header. */
3231 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3234 struct ospf_header
*ospfh
;
3236 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3238 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3239 ospfh
->type
= (uint8_t)type
;
3241 ospfh
->router_id
= oi
->ospf
->router_id
;
3243 ospfh
->checksum
= 0;
3244 ospfh
->area_id
= oi
->area
->area_id
;
3245 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3247 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3249 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3252 /* Make Authentication Data. */
3253 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3255 struct crypt_key
*ck
;
3257 switch (ospf_auth_type(oi
)) {
3258 case OSPF_AUTH_NULL
:
3259 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3262 case OSPF_AUTH_SIMPLE
:
3263 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3264 OSPF_AUTH_SIMPLE_SIZE
);
3266 case OSPF_AUTH_CRYPTOGRAPHIC
:
3267 /* If key is not set, then set 0. */
3268 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3269 ospfh
->u
.crypt
.zero
= 0;
3270 ospfh
->u
.crypt
.key_id
= 0;
3271 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3274 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3275 ospfh
->u
.crypt
.zero
= 0;
3276 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3277 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3279 /* note: the seq is done in ospf_make_md5_digest() */
3282 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3290 /* Fill rest of OSPF header. */
3291 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3294 struct ospf_header
*ospfh
;
3296 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3299 ospfh
->length
= htons(length
);
3301 /* Calculate checksum. */
3302 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3303 ospfh
->checksum
= in_cksum(ospfh
, length
);
3305 ospfh
->checksum
= 0;
3307 /* Add Authentication Data. */
3308 ospf_make_auth(oi
, ospfh
);
3311 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3313 struct ospf_neighbor
*nbr
;
3314 struct route_node
*rn
;
3315 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3316 struct in_addr mask
;
3320 /* Set netmask of interface. */
3321 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3322 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3323 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3324 masklen2ip(oi
->address
->prefixlen
, &mask
);
3326 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3327 stream_put_ipv4(s
, mask
.s_addr
);
3329 /* Set Hello Interval. */
3330 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3331 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3333 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3335 if (IS_DEBUG_OSPF_EVENT
)
3336 zlog_debug("%s: options: %x, int: %s", __func__
, OPTIONS(oi
),
3340 stream_putc(s
, OPTIONS(oi
));
3342 /* Set Router Priority. */
3343 stream_putc(s
, PRIORITY(oi
));
3345 /* Set Router Dead Interval. */
3346 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3348 /* Set Designated Router. */
3349 stream_put_ipv4(s
, DR(oi
).s_addr
);
3351 p
= stream_get_endp(s
);
3353 /* Set Backup Designated Router. */
3354 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3356 /* Add neighbor seen. */
3357 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
)) {
3363 /* Ignore the 0.0.0.0 node */
3364 if (nbr
->router_id
.s_addr
== INADDR_ANY
)
3367 /* Ignore Down neighbor */
3368 if (nbr
->state
== NSM_Attempt
)
3371 /* This is myself for DR election */
3372 if (nbr
->state
== NSM_Down
)
3375 if (IPV4_ADDR_SAME(&nbr
->router_id
, &oi
->ospf
->router_id
))
3377 /* Check neighbor is sane? */
3378 if (nbr
->d_router
.s_addr
!= INADDR_ANY
&&
3379 IPV4_ADDR_SAME(&nbr
->d_router
, &oi
->address
->u
.prefix4
) &&
3380 IPV4_ADDR_SAME(&nbr
->bd_router
, &oi
->address
->u
.prefix4
))
3383 /* Hello packet overflows interface MTU.
3385 if (length
+ sizeof(uint32_t) > ospf_packet_max(oi
)) {
3387 EC_OSPF_LARGE_HELLO
,
3388 "Oversized Hello packet! Larger than MTU. Not sending it out");
3392 stream_put_ipv4(s
, nbr
->router_id
.s_addr
);
3396 /* Let neighbor generate BackupSeen. */
3398 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3403 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3404 struct ospf_neighbor
*nbr
, struct stream
*s
)
3406 struct ospf_lsa
*lsa
;
3407 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3411 struct ospf_lsdb
*lsdb
;
3413 /* Set Interface MTU. */
3414 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3417 stream_putw(s
, oi
->ifp
->mtu
);
3420 options
= OPTIONS(oi
);
3421 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3422 SET_FLAG(options
, OSPF_OPTION_O
);
3423 stream_putc(s
, options
);
3426 pp
= stream_get_endp(s
);
3427 stream_putc(s
, nbr
->dd_flags
);
3429 /* Set DD Sequence Number. */
3430 stream_putl(s
, nbr
->dd_seqnum
);
3432 /* shortcut unneeded walk of (empty) summary LSDBs */
3433 if (ospf_db_summary_isempty(nbr
))
3436 /* Describe LSA Header from Database Summary List. */
3437 lsdb
= &nbr
->db_sum
;
3439 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3440 struct route_table
*table
= lsdb
->type
[i
].db
;
3441 struct route_node
*rn
;
3443 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3444 if ((lsa
= rn
->info
) != NULL
) {
3445 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3446 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3447 /* Suppress advertising
3448 * opaque-information. */
3449 /* Remove LSA from DB summary list. */
3450 ospf_lsdb_delete(lsdb
, lsa
);
3454 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3455 struct lsa_header
*lsah
;
3458 /* DD packet overflows interface MTU. */
3459 if (length
+ OSPF_LSA_HEADER_SIZE
3460 > ospf_packet_max(oi
))
3463 /* Keep pointer to LS age. */
3464 lsah
= (struct lsa_header
3469 /* Proceed stream pointer. */
3470 stream_put(s
, lsa
->data
,
3471 OSPF_LSA_HEADER_SIZE
);
3472 length
+= OSPF_LSA_HEADER_SIZE
;
3475 ls_age
= LS_AGE(lsa
);
3476 lsah
->ls_age
= htons(ls_age
);
3479 /* Remove LSA from DB summary list. */
3480 ospf_lsdb_delete(lsdb
, lsa
);
3484 /* Update 'More' bit */
3485 if (ospf_db_summary_isempty(nbr
)) {
3487 if (nbr
->state
>= NSM_Exchange
) {
3488 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3489 /* Rewrite DD flags */
3490 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3492 assert(IS_SET_DD_M(nbr
->dd_flags
));
3498 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3499 unsigned long delta
, struct ospf_neighbor
*nbr
,
3500 struct ospf_lsa
*lsa
)
3502 struct ospf_interface
*oi
;
3506 /* LS Request packet overflows interface MTU
3507 * delta is just number of bytes required for 1 LS Req
3508 * ospf_packet_max will return the number of bytes can
3509 * be accommodated without ospf header. So length+delta
3510 * can be compared to ospf_packet_max
3511 * to check if it can fit another lsreq in the same packet.
3514 if (*length
+ delta
> ospf_packet_max(oi
))
3517 stream_putl(s
, lsa
->data
->type
);
3518 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3519 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3521 ospf_lsa_unlock(&nbr
->ls_req_last
);
3522 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3528 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3530 struct ospf_lsa
*lsa
;
3531 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3532 unsigned long delta
= 12;
3533 struct route_table
*table
;
3534 struct route_node
*rn
;
3536 struct ospf_lsdb
*lsdb
;
3538 lsdb
= &nbr
->ls_req
;
3540 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3541 table
= lsdb
->type
[i
].db
;
3542 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3543 if ((lsa
= (rn
->info
)) != NULL
)
3544 if (ospf_make_ls_req_func(s
, &length
, delta
,
3547 route_unlock_node(rn
);
3554 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3558 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3560 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3563 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3566 struct ospf_lsa
*lsa
;
3567 struct listnode
*node
;
3568 uint16_t length
= 0;
3569 unsigned int size_noauth
;
3570 unsigned long delta
= stream_get_endp(s
);
3574 if (IS_DEBUG_OSPF_EVENT
)
3575 zlog_debug("%s: Start", __func__
);
3577 pp
= stream_get_endp(s
);
3578 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3579 length
+= OSPF_LS_UPD_MIN_SIZE
;
3581 /* Calculate amount of packet usable for data. */
3582 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3584 while ((node
= listhead(update
)) != NULL
) {
3585 struct lsa_header
*lsah
;
3588 lsa
= listgetdata(node
);
3591 if (IS_DEBUG_OSPF_EVENT
)
3592 zlog_debug("%s: List Iteration %d LSA[%s]", __func__
,
3593 count
, dump_lsa_key(lsa
));
3595 /* Will it fit? Minimum it has to fit at least one */
3596 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3600 /* Keep pointer to LS age. */
3601 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3602 + stream_get_endp(s
));
3604 /* Put LSA to Link State Request. */
3605 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3608 /* each hop must increment an lsa_age by transmit_delay
3609 of OSPF interface */
3610 ls_age
= ls_age_increment(lsa
,
3611 OSPF_IF_PARAM(oi
, transmit_delay
));
3612 lsah
->ls_age
= htons(ls_age
);
3614 length
+= ntohs(lsa
->data
->length
);
3617 list_delete_node(update
, node
);
3618 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3621 /* Now set #LSAs. */
3622 stream_putl_at(s
, pp
, count
);
3624 if (IS_DEBUG_OSPF_EVENT
)
3625 zlog_debug("%s: Stop", __func__
);
3629 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3632 struct listnode
*node
, *nnode
;
3633 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3634 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3635 struct ospf_lsa
*lsa
;
3637 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3640 /* LS Ack packet overflows interface MTU
3641 * delta is just number of bytes required for
3642 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3643 * the number of bytes can be accommodated without
3644 * ospf header. So length+delta can be compared
3645 * against ospf_packet_max to check if it can fit
3646 * another ls header in the same packet.
3648 if ((length
+ delta
) > ospf_packet_max(oi
))
3651 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3652 length
+= OSPF_LSA_HEADER_SIZE
;
3654 listnode_delete(ack
, lsa
);
3655 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3661 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3663 struct ospf_packet
*op
;
3664 uint16_t length
= OSPF_HEADER_SIZE
;
3666 op
= ospf_packet_new(oi
->ifp
->mtu
);
3668 /* Prepare OSPF common header. */
3669 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3671 /* Prepare OSPF Hello body. */
3672 length
+= ospf_make_hello(oi
, op
->s
);
3673 if (length
== OSPF_HEADER_SIZE
) {
3674 /* Hello overshooting MTU */
3675 ospf_packet_free(op
);
3679 /* Fill OSPF header. */
3680 ospf_fill_header(oi
, op
->s
, length
);
3682 /* Set packet length. */
3683 op
->length
= length
;
3685 op
->dst
.s_addr
= addr
;
3687 if (IS_DEBUG_OSPF_EVENT
) {
3688 if (oi
->ospf
->vrf_id
)
3690 "%s: Hello Tx interface %s ospf vrf %s id %u",
3691 __func__
, oi
->ifp
->name
,
3692 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3695 /* Add packet to the top of the interface output queue, so that they
3696 * can't get delayed by things like long queues of LS Update packets
3698 ospf_packet_add_top(oi
, op
);
3700 /* Hook thread to write packet. */
3701 OSPF_ISM_WRITE_ON(oi
->ospf
);
3704 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3706 struct ospf_interface
*oi
;
3711 /* If this is passive interface, do not send OSPF Hello. */
3712 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3715 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3718 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3721 if (PRIORITY(oi
) == 0)
3724 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3725 && oi
->state
!= ISM_Backup
)
3728 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3731 void ospf_poll_timer(struct thread
*thread
)
3733 struct ospf_nbr_nbma
*nbr_nbma
;
3735 nbr_nbma
= THREAD_ARG(thread
);
3736 nbr_nbma
->t_poll
= NULL
;
3738 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3739 zlog_debug("NSM[%s:%pI4]: Timer (Poll timer expire)",
3740 IF_NAME(nbr_nbma
->oi
), &nbr_nbma
->addr
);
3742 ospf_poll_send(nbr_nbma
);
3744 if (nbr_nbma
->v_poll
> 0)
3745 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3750 void ospf_hello_reply_timer(struct thread
*thread
)
3752 struct ospf_neighbor
*nbr
;
3754 nbr
= THREAD_ARG(thread
);
3755 nbr
->t_hello_reply
= NULL
;
3757 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3758 zlog_debug("NSM[%s:%pI4]: Timer (hello-reply timer expire)",
3759 IF_NAME(nbr
->oi
), &nbr
->router_id
);
3761 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3764 /* Send OSPF Hello. */
3765 void ospf_hello_send(struct ospf_interface
*oi
)
3767 /* If this is passive interface, do not send OSPF Hello. */
3768 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3771 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3772 struct ospf_neighbor
*nbr
;
3773 struct route_node
*rn
;
3775 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
)) {
3780 if (nbr
== oi
->nbr_self
)
3783 if (nbr
->state
== NSM_Down
)
3787 * RFC 2328 Section 9.5.1
3788 * If the router is not eligible to become Designated
3789 * Router, it must periodically send Hello Packets to
3790 * both the Designated Router and the Backup
3791 * Designated Router (if they exist).
3793 if (PRIORITY(oi
) == 0 &&
3794 IPV4_ADDR_CMP(&DR(oi
), &nbr
->address
.u
.prefix4
) &&
3795 IPV4_ADDR_CMP(&BDR(oi
), &nbr
->address
.u
.prefix4
))
3799 * If the router is eligible to become Designated
3800 * Router, it must periodically send Hello Packets to
3801 * all neighbors that are also eligible. In addition,
3802 * if the router is itself the Designated Router or
3803 * Backup Designated Router, it must also send periodic
3804 * Hello Packets to all other neighbors.
3806 if (nbr
->priority
== 0 && oi
->state
== ISM_DROther
)
3809 /* if oi->state == Waiting, send
3810 * hello to all neighbors */
3811 ospf_hello_send_sub(oi
, nbr
->address
.u
.prefix4
.s_addr
);
3814 /* Decide destination address. */
3815 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3816 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3818 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3822 /* Send OSPF Database Description. */
3823 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3825 struct ospf_interface
*oi
;
3826 struct ospf_packet
*op
;
3827 uint16_t length
= OSPF_HEADER_SIZE
;
3830 op
= ospf_packet_new(oi
->ifp
->mtu
);
3832 /* Prepare OSPF common header. */
3833 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3835 /* Prepare OSPF Database Description body. */
3836 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3838 /* Fill OSPF header. */
3839 ospf_fill_header(oi
, op
->s
, length
);
3841 /* Set packet length. */
3842 op
->length
= length
;
3844 /* Decide destination address. */
3845 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3846 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3848 op
->dst
= nbr
->address
.u
.prefix4
;
3850 /* Add packet to the interface output queue. */
3851 ospf_packet_add(oi
, op
);
3853 /* Hook thread to write packet. */
3854 OSPF_ISM_WRITE_ON(oi
->ospf
);
3856 /* Remove old DD packet, then copy new one and keep in neighbor
3859 ospf_packet_free(nbr
->last_send
);
3860 nbr
->last_send
= ospf_packet_dup(op
);
3861 monotime(&nbr
->last_send_ts
);
3862 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3864 "%s:Packet[DD]: %pI4 DB Desc send with seqnum:%x , flags:%x",
3865 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
3866 nbr
->dd_seqnum
, nbr
->dd_flags
);
3869 /* Re-send Database Description. */
3870 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3872 struct ospf_interface
*oi
;
3876 /* Add packet to the interface output queue. */
3877 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3879 /* Hook thread to write packet. */
3880 OSPF_ISM_WRITE_ON(oi
->ospf
);
3881 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3883 "%s:Packet[DD]: %pI4 DB Desc resend with seqnum:%x , flags:%x",
3884 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
3885 nbr
->dd_seqnum
, nbr
->dd_flags
);
3888 /* Send Link State Request. */
3889 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3891 struct ospf_interface
*oi
;
3892 struct ospf_packet
*op
;
3893 uint16_t length
= OSPF_HEADER_SIZE
;
3896 op
= ospf_packet_new(oi
->ifp
->mtu
);
3898 /* Prepare OSPF common header. */
3899 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3901 /* Prepare OSPF Link State Request body. */
3902 length
+= ospf_make_ls_req(nbr
, op
->s
);
3903 if (length
== OSPF_HEADER_SIZE
) {
3904 ospf_packet_free(op
);
3908 /* Fill OSPF header. */
3909 ospf_fill_header(oi
, op
->s
, length
);
3911 /* Set packet length. */
3912 op
->length
= length
;
3914 /* Decide destination address. */
3915 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3916 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3918 op
->dst
= nbr
->address
.u
.prefix4
;
3920 /* Add packet to the interface output queue. */
3921 ospf_packet_add(oi
, op
);
3923 /* Hook thread to write packet. */
3924 OSPF_ISM_WRITE_ON(oi
->ospf
);
3926 /* Add Link State Request Retransmission Timer. */
3927 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3930 /* Send Link State Update with an LSA. */
3931 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3934 struct list
*update
;
3936 update
= list_new();
3938 listnode_add(update
, lsa
);
3940 /*ospf instance is going down, send self originated
3941 * MAXAGE LSA update to neighbors to remove from LSDB */
3942 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3943 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3945 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3947 list_delete(&update
);
3950 /* Determine size for packet. Must be at least big enough to accommodate next
3951 * LSA on list, which may be bigger than MTU size.
3953 * Return pointer to new ospf_packet
3954 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3955 * on packet sizes (in which case offending LSA is deleted from update list)
3957 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3958 struct ospf_interface
*oi
)
3960 struct ospf_lsa
*lsa
;
3961 struct listnode
*ln
;
3963 static char warned
= 0;
3965 lsa
= listgetdata((ln
= listhead(update
)));
3968 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3969 > ospf_packet_max(oi
)) {
3973 "%s: 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 ..'",
3978 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3980 "%s: oversized LSA id:%pI4, %d bytes originated by %pI4, will be fragmented!",
3981 __func__
, &lsa
->data
->id
,
3982 ntohs(lsa
->data
->length
),
3983 &lsa
->data
->adv_router
);
3986 * Allocate just enough to fit this LSA only, to avoid including
3988 * LSAs in fragmented LSA Updates.
3990 size
= ntohs(lsa
->data
->length
)
3991 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
3992 + OSPF_LS_UPD_MIN_SIZE
;
3994 size
= oi
->ifp
->mtu
;
3996 if (size
> OSPF_MAX_PACKET_SIZE
) {
3999 "%s: oversized LSA id:%pI4 too big, %d bytes, packet size %ld, dropping it completely. OSPF routing is broken!",
4000 __func__
, &lsa
->data
->id
, ntohs(lsa
->data
->length
),
4002 list_delete_node(update
, ln
);
4006 /* IP header is built up separately by ospf_write(). This means, that we
4008 * reduce the "affordable" size just calculated by length of an IP
4010 * This makes sure, that even if we manage to fill the payload with LSA
4012 * completely, the final packet (our data plus IP header) still fits
4014 * outgoing interface MTU. This correction isn't really meaningful for
4016 * oversized LSA, but for consistency the correction is done for both
4019 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
4021 return ospf_packet_new(size
- sizeof(struct ip
));
4024 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
4025 struct list
*update
, struct in_addr addr
,
4028 struct ospf_packet
*op
;
4029 uint16_t length
= OSPF_HEADER_SIZE
;
4031 if (IS_DEBUG_OSPF_EVENT
)
4032 zlog_debug("listcount = %d, [%s]dst %pI4", listcount(update
),
4033 IF_NAME(oi
), &addr
);
4035 /* Check that we have really something to process */
4036 if (listcount(update
) == 0)
4039 op
= ospf_ls_upd_packet_new(update
, oi
);
4041 /* Prepare OSPF common header. */
4042 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4044 /* Prepare OSPF Link State Update body.
4045 * Includes Type-7 translation.
4047 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4049 /* Fill OSPF header. */
4050 ospf_fill_header(oi
, op
->s
, length
);
4052 /* Set packet length. */
4053 op
->length
= length
;
4055 /* Decide destination address. */
4056 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4057 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4059 op
->dst
.s_addr
= addr
.s_addr
;
4061 /* Add packet to the interface output queue. */
4062 ospf_packet_add(oi
, op
);
4063 /* Call ospf_write() right away to send ospf packets to neighbors */
4064 if (send_lsupd_now
) {
4065 struct thread os_packet_thd
;
4067 os_packet_thd
.arg
= (void *)oi
->ospf
;
4068 if (oi
->on_write_q
== 0) {
4069 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4072 ospf_write(&os_packet_thd
);
4074 * We are fake calling ospf_write with a fake
4075 * thread. Imagine that we have oi_a already
4076 * enqueued and we have turned on the write
4078 * Now this function calls this for oi_b
4079 * so the on_write_q has oi_a and oi_b on
4080 * it, ospf_write runs and clears the packets
4081 * for both oi_a and oi_b. Removing them from
4082 * the on_write_q. After this thread of execution
4083 * finishes we will execute the t_write thread
4084 * with nothing in the on_write_q causing an
4085 * assert. So just make sure that the t_write
4086 * is actually turned off.
4088 if (list_isempty(oi
->ospf
->oi_write_q
))
4089 THREAD_OFF(oi
->ospf
->t_write
);
4091 /* Hook thread to write packet. */
4092 OSPF_ISM_WRITE_ON(oi
->ospf
);
4096 static void ospf_ls_upd_send_queue_event(struct thread
*thread
)
4098 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4099 struct route_node
*rn
;
4100 struct route_node
*rnext
;
4101 struct list
*update
;
4104 oi
->t_ls_upd_event
= NULL
;
4106 if (IS_DEBUG_OSPF_EVENT
)
4107 zlog_debug("%s start", __func__
);
4109 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4110 rnext
= route_next(rn
);
4112 if (rn
->info
== NULL
)
4115 update
= (struct list
*)rn
->info
;
4117 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4119 /* list might not be empty. */
4120 if (listcount(update
) == 0) {
4121 list_delete((struct list
**)&rn
->info
);
4122 route_unlock_node(rn
);
4128 if (IS_DEBUG_OSPF_EVENT
)
4130 "%s: update lists not cleared, %d nodes to try again, raising new event",
4132 oi
->t_ls_upd_event
= NULL
;
4133 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4134 &oi
->t_ls_upd_event
);
4137 if (IS_DEBUG_OSPF_EVENT
)
4138 zlog_debug("%s stop", __func__
);
4141 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4144 struct ospf_interface
*oi
;
4145 struct ospf_lsa
*lsa
;
4146 struct prefix_ipv4 p
;
4147 struct route_node
*rn
;
4148 struct listnode
*node
;
4153 p
.prefixlen
= IPV4_MAX_BITLEN
;
4155 /* Decide destination address. */
4156 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4157 p
.prefix
= oi
->vl_data
->peer_addr
;
4158 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4159 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4160 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4161 p
.prefix
= nbr
->address
.u
.prefix4
;
4162 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4163 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4164 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4165 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4167 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4169 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4170 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4173 "* LS-Update is directly sent on NBMA network.");
4174 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4175 flog_warn(EC_OSPF_PACKET
,
4176 "* LS-Update is sent to myself.");
4179 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4181 if (rn
->info
== NULL
)
4182 rn
->info
= list_new();
4184 route_unlock_node(rn
);
4186 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4187 listnode_add(rn
->info
,
4188 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4189 if (send_lsupd_now
) {
4190 struct list
*send_update_list
;
4191 struct route_node
*rnext
;
4193 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4194 rnext
= route_next(rn
);
4196 if (rn
->info
== NULL
)
4199 send_update_list
= (struct list
*)rn
->info
;
4201 ospf_ls_upd_queue_send(oi
, send_update_list
,
4202 rn
->p
.u
.prefix4
, 1);
4205 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4206 &oi
->t_ls_upd_event
);
4209 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4212 struct ospf_packet
*op
;
4213 uint16_t length
= OSPF_HEADER_SIZE
;
4215 op
= ospf_packet_new(oi
->ifp
->mtu
);
4217 /* Prepare OSPF common header. */
4218 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4220 /* Prepare OSPF Link State Acknowledgment body. */
4221 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4223 /* Fill OSPF header. */
4224 ospf_fill_header(oi
, op
->s
, length
);
4226 /* Set packet length. */
4227 op
->length
= length
;
4229 /* Decide destination address. */
4230 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
||
4231 oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4232 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4234 op
->dst
.s_addr
= dst
.s_addr
;
4236 /* Add packet to the interface output queue. */
4237 ospf_packet_add(oi
, op
);
4239 /* Hook thread to write packet. */
4240 OSPF_ISM_WRITE_ON(oi
->ospf
);
4243 static void ospf_ls_ack_send_event(struct thread
*thread
)
4245 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4247 oi
->t_ls_ack_direct
= NULL
;
4249 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4250 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4251 oi
->ls_ack_direct
.dst
);
4254 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4256 struct ospf_interface
*oi
= nbr
->oi
;
4258 if (IS_GRACE_LSA(lsa
)) {
4259 if (IS_DEBUG_OSPF_GR
)
4260 zlog_debug("%s, Sending GRACE ACK to Restarter.",
4264 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4265 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4267 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4269 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4270 &oi
->t_ls_ack_direct
);
4273 /* Send Link State Acknowledgment delayed. */
4274 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4278 /* Decide destination address. */
4279 /* RFC2328 Section 13.5 On non-broadcast
4280 networks, delayed Link State Acknowledgment packets must be
4281 unicast separately over each adjacency (i.e., neighbor whose
4282 state is >= Exchange). */
4283 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4284 struct ospf_neighbor
*nbr
;
4285 struct route_node
*rn
;
4287 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
)) {
4293 if (nbr
!= oi
->nbr_self
&& nbr
->state
>= NSM_Exchange
)
4294 while (listcount(oi
->ls_ack
))
4295 ospf_ls_ack_send_list(
4297 nbr
->address
.u
.prefix4
);
4301 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4302 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4303 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4304 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4305 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4306 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4307 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4308 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4310 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4312 while (listcount(oi
->ls_ack
))
4313 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4317 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4318 * address. As a result, the kernel does not need to learn the interface
4319 * MAC of the OSPF neighbor. However, in our world, this will delay
4320 * convergence. Take the case when due to a link flap, all routes now
4321 * want to use an interface which was deemed to be costlier prior to this
4322 * event. For routes that will be installed, the missing MAC will have
4323 * punt-to-CPU set on them. This may overload the CPU control path that
4324 * can be avoided if the MAC was known apriori.
4326 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4328 if (!nbr
|| !nbr
->oi
->ospf
->proactive_arp
)
4331 ospf_zebra_send_arp(nbr
->oi
->ifp
, &nbr
->address
);