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
)
445 "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u",
446 (unsigned long)stream_get_endp(op
->s
), op
->length
);
448 return OSPF_AUTH_MD5_SIZE
;
452 static 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_cancel(&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 "*** ospf_write_frags: sendmsg failed to %pI4, id %d, off %d, len %d, mtu %u failed with %s",
600 &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
)) {
605 "ospf_write_frags: sent id %d, off %d, len %d to %pI4",
606 iph
->ip_id
, iph
->ip_off
, iph
->ip_len
,
610 iph
->ip_off
+= offset
;
611 stream_forward_getp(op
->s
, iovp
->iov_len
);
612 iovp
->iov_base
= stream_pnt(op
->s
);
615 /* setup for final fragment */
616 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
617 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
618 iph
->ip_off
&= (~IP_MF
);
620 #endif /* WANT_OSPF_WRITE_FRAGMENT */
622 static void ospf_write(struct thread
*thread
)
624 struct ospf
*ospf
= THREAD_ARG(thread
);
625 struct ospf_interface
*oi
;
626 struct ospf_interface
*last_serviced_oi
= NULL
;
627 struct ospf_packet
*op
;
628 struct sockaddr_in sa_dst
;
635 struct listnode
*node
;
636 #ifdef WANT_OSPF_WRITE_FRAGMENT
637 static uint16_t ipid
= 0;
638 uint16_t maxdatasize
;
639 #endif /* WANT_OSPF_WRITE_FRAGMENT */
640 #define OSPF_WRITE_IPHL_SHIFT 2
644 unsigned char cmsgbuf
[64] = {};
645 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
646 struct in_pktinfo
*pi
;
649 if (ospf
->fd
< 0 || ospf
->oi_running
== 0) {
650 if (IS_DEBUG_OSPF_EVENT
)
652 "ospf_write failed to send, fd %d, instance %u",
653 ospf
->fd
, ospf
->oi_running
);
657 node
= listhead(ospf
->oi_write_q
);
659 oi
= listgetdata(node
);
661 #ifdef WANT_OSPF_WRITE_FRAGMENT
662 /* seed ipid static with low order bits of time */
664 ipid
= (time(NULL
) & 0xffff);
665 #endif /* WANT_OSPF_WRITE_FRAGMENT */
667 while ((pkt_count
< ospf
->write_oi_count
) && oi
668 && (last_serviced_oi
!= oi
)) {
669 /* If there is only packet in the queue, the oi is removed from
670 write-q, so fix up the last interface that was serviced */
671 if (last_serviced_oi
== NULL
) {
672 last_serviced_oi
= oi
;
675 #ifdef WANT_OSPF_WRITE_FRAGMENT
676 /* convenience - max OSPF data per packet */
677 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
678 #endif /* WANT_OSPF_WRITE_FRAGMENT */
679 /* Get one packet from queue. */
680 op
= ospf_fifo_head(oi
->obuf
);
682 assert(op
->length
>= OSPF_HEADER_SIZE
);
684 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
685 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
686 ospf_if_ipmulticast(ospf
, oi
->address
,
689 /* Rewrite the md5 signature & update the seq */
690 ospf_make_md5_digest(oi
, op
);
692 /* Retrieve OSPF packet type. */
693 stream_set_getp(op
->s
, 1);
694 type
= stream_getc(op
->s
);
696 /* reset get pointer */
697 stream_set_getp(op
->s
, 0);
699 memset(&iph
, 0, sizeof(struct ip
));
700 memset(&sa_dst
, 0, sizeof(sa_dst
));
702 sa_dst
.sin_family
= AF_INET
;
703 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
704 sa_dst
.sin_len
= sizeof(sa_dst
);
705 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
706 sa_dst
.sin_addr
= op
->dst
;
707 sa_dst
.sin_port
= htons(0);
709 /* Set DONTROUTE flag if dst is unicast. */
710 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
711 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
712 flags
= MSG_DONTROUTE
;
714 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
715 /* it'd be very strange for header to not be 4byte-word aligned
717 if (sizeof(struct ip
)
718 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
719 iph
.ip_hl
++; /* we presume sizeof(struct ip) cant
722 iph
.ip_v
= IPVERSION
;
723 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
724 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
726 #if defined(__DragonFly__)
728 * DragonFly's raw socket expects ip_len/ip_off in network byte
731 iph
.ip_len
= htons(iph
.ip_len
);
734 #ifdef WANT_OSPF_WRITE_FRAGMENT
735 /* XXX-MT: not thread-safe at all..
736 * XXX: this presumes this is only programme sending OSPF
738 * otherwise, no guarantee ipid will be unique
741 #endif /* WANT_OSPF_WRITE_FRAGMENT */
744 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
745 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
747 iph
.ip_ttl
= OSPF_IP_TTL
;
748 iph
.ip_p
= IPPROTO_OSPFIGP
;
750 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
751 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
753 memset(&msg
, 0, sizeof(msg
));
754 msg
.msg_name
= (caddr_t
)&sa_dst
;
755 msg
.msg_namelen
= sizeof(sa_dst
);
759 iov
[0].iov_base
= (char *)&iph
;
760 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
761 iov
[1].iov_base
= stream_pnt(op
->s
);
762 iov
[1].iov_len
= op
->length
;
765 msg
.msg_control
= (caddr_t
)cm
;
766 cm
->cmsg_level
= SOL_IP
;
767 cm
->cmsg_type
= IP_PKTINFO
;
768 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
769 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
770 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
772 msg
.msg_controllen
= cm
->cmsg_len
;
775 /* Sadly we can not rely on kernels to fragment packets
776 * because of either IP_HDRINCL and/or multicast
777 * destination being set.
780 #ifdef WANT_OSPF_WRITE_FRAGMENT
781 if (op
->length
> maxdatasize
)
782 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
783 oi
->ifp
->mtu
, flags
, type
);
784 #endif /* WANT_OSPF_WRITE_FRAGMENT */
786 /* send final fragment (could be first) */
787 sockopt_iphdrincl_swab_htosys(&iph
);
788 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
789 sockopt_iphdrincl_swab_systoh(&iph
);
790 if (IS_DEBUG_OSPF_EVENT
)
792 "ospf_write to %pI4, id %d, off %d, len %d, interface %s, mtu %u:",
793 &iph
.ip_dst
, iph
.ip_id
, iph
.ip_off
,
794 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
796 /* sendmsg will return EPERM if firewall is blocking sending.
797 * This is a normal situation when 'ip nhrp map multicast xxx'
798 * is being used to send multicast packets to DMVPN peers. In
799 * that case the original message is blocked with iptables rule
800 * causing the EPERM result
802 if (ret
< 0 && errno
!= EPERM
)
805 "*** sendmsg in ospf_write failed to %pI4, id %d, off %d, len %d, interface %s, mtu %u: %s",
806 &iph
.ip_dst
, iph
.ip_id
, iph
.ip_off
,
807 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
808 safe_strerror(errno
));
810 /* Show debug sending packet. */
811 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
812 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
814 "-----------------------------------------------------");
815 stream_set_getp(op
->s
, 0);
816 ospf_packet_dump(op
->s
);
819 zlog_debug("%s sent to [%pI4] via [%s].",
820 lookup_msg(ospf_packet_type_str
, type
, NULL
),
821 &op
->dst
, IF_NAME(oi
));
823 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
825 "-----------------------------------------------------");
832 case OSPF_MSG_DB_DESC
:
835 case OSPF_MSG_LS_REQ
:
838 case OSPF_MSG_LS_UPD
:
841 case OSPF_MSG_LS_ACK
:
848 /* Now delete packet from queue. */
849 ospf_packet_delete(oi
);
851 /* Move this interface to the tail of write_q to
852 serve everyone in a round robin fashion */
853 list_delete_node(ospf
->oi_write_q
, node
);
854 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
856 last_serviced_oi
= NULL
;
859 listnode_add(ospf
->oi_write_q
, oi
);
862 /* Setup to service from the head of the queue again */
863 if (!list_isempty(ospf
->oi_write_q
)) {
864 node
= listhead(ospf
->oi_write_q
);
865 oi
= listgetdata(node
);
869 /* If packets still remain in queue, call write thread. */
870 if (!list_isempty(ospf
->oi_write_q
))
871 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
875 /* OSPF Hello message read -- RFC2328 Section 10.5. */
876 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
877 struct stream
*s
, struct ospf_interface
*oi
, int size
)
879 struct ospf_hello
*hello
;
880 struct ospf_neighbor
*nbr
;
884 /* increment statistics. */
887 hello
= (struct ospf_hello
*)stream_pnt(s
);
889 /* If Hello is myself, silently discard. */
890 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
891 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
893 "ospf_header[%s/%pI4]: selforiginated, dropping.",
894 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
901 /* get neighbor prefix. */
903 p
.prefixlen
= ip_masklen(hello
->network_mask
);
904 p
.u
.prefix4
= iph
->ip_src
;
906 /* Compare network mask. */
907 /* Checking is ignored for Point-to-Point and Virtual link. */
908 /* Checking is also ignored for Point-to-Multipoint with /32 prefix */
909 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
910 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
911 && !(oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
912 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
))
913 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
916 "Packet %pI4 [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
917 &ospfh
->router_id
, IF_NAME(oi
),
918 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
922 /* Compare Router Dead Interval. */
923 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
924 flog_warn(EC_OSPF_PACKET
,
925 "Packet %pI4 [Hello:RECV]: RouterDeadInterval mismatch (expected %u, but received %u).",
927 OSPF_IF_PARAM(oi
, v_wait
),
928 ntohl(hello
->dead_interval
));
932 /* Compare Hello Interval - ignored if fast-hellos are set. */
933 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
934 if (OSPF_IF_PARAM(oi
, v_hello
)
935 != ntohs(hello
->hello_interval
)) {
938 "Packet %pI4 [Hello:RECV]: HelloInterval mismatch (expected %u, but received %u).",
940 OSPF_IF_PARAM(oi
, v_hello
),
941 ntohs(hello
->hello_interval
));
946 if (IS_DEBUG_OSPF_EVENT
)
947 zlog_debug("Packet %pI4 [Hello:RECV]: Options %s vrf %s",
949 ospf_options_dump(hello
->options
),
950 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
952 /* Compare options. */
953 #define REJECT_IF_TBIT_ON 1 /* XXX */
954 #ifdef REJECT_IF_TBIT_ON
955 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
957 * This router does not support non-zero TOS.
958 * Drop this Hello packet not to establish neighbor
961 flog_warn(EC_OSPF_PACKET
,
962 "Packet %pI4 [Hello:RECV]: T-bit on, drop it.",
966 #endif /* REJECT_IF_TBIT_ON */
968 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
969 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
971 * This router does know the correct usage of O-bit
972 * the bit should be set in DD packet only.
974 flog_warn(EC_OSPF_PACKET
,
975 "Packet %pI4 [Hello:RECV]: O-bit abuse?",
977 #ifdef STRICT_OBIT_USAGE_CHECK
978 return; /* Reject this packet. */
979 #else /* STRICT_OBIT_USAGE_CHECK */
980 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
981 #endif /* STRICT_OBIT_USAGE_CHECK */
984 /* new for NSSA is to ensure that NP is on and E is off */
986 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
987 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
988 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
989 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
990 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
993 "NSSA-Packet-%pI4[Hello:RECV]: my options: %x, his options %x",
994 &ospfh
->router_id
, OPTIONS(oi
),
998 if (IS_DEBUG_OSPF_NSSA
)
999 zlog_debug("NSSA-Hello:RECV:Packet from %pI4:",
1002 /* The setting of the E-bit found in the Hello Packet's Options
1003 field must match this area's ExternalRoutingCapability A
1004 mismatch causes processing to stop and the packet to be
1005 dropped. The setting of the rest of the bits in the Hello
1006 Packet's Options field should be ignored. */
1007 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1008 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1011 "Packet %pI4 [Hello:RECV]: my options: %x, his options %x",
1012 &ospfh
->router_id
, OPTIONS(oi
),
1017 /* get neighbour struct */
1018 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1020 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1023 old_state
= nbr
->state
;
1025 /* Add event to thread. */
1026 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_HelloReceived
);
1028 /* RFC2328 Section 9.5.1
1029 If the router is not eligible to become Designated Router,
1030 (snip) It must also send an Hello Packet in reply to an
1031 Hello Packet received from any eligible neighbor (other than
1032 the current Designated Router and Backup Designated Router). */
1033 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1034 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1035 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1036 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1037 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1038 ospf_hello_reply_timer
,
1039 OSPF_HELLO_REPLY_DELAY
);
1041 /* on NBMA network type, it happens to receive bidirectional Hello
1043 without advance 1-Way Received event.
1044 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1045 if (oi
->type
== OSPF_IFTYPE_NBMA
1046 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1047 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1048 nbr
->priority
= hello
->priority
;
1049 nbr
->d_router
= hello
->d_router
;
1050 nbr
->bd_router
= hello
->bd_router
;
1054 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1055 size
- OSPF_HELLO_MIN_SIZE
)) {
1056 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1057 nbr
->options
|= hello
->options
;
1059 /* If the router is DR_OTHER, RESTARTER will not wait
1060 * until it receives the hello from it if it receives
1062 * So, helper might receives ONW_WAY hello from
1063 * RESTARTER. So not allowing to change the state if it
1064 * receives one_way hellow when it acts as HELPER for
1065 * that specific neighbor.
1067 if (!OSPF_GR_IS_ACTIVE_HELPER(nbr
))
1068 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1069 /* Set neighbor information. */
1070 nbr
->priority
= hello
->priority
;
1071 nbr
->d_router
= hello
->d_router
;
1072 nbr
->bd_router
= hello
->bd_router
;
1076 if (OSPF_GR_IS_ACTIVE_HELPER(nbr
)) {
1077 /* As per the GR Conformance Test Case 7.2. Section 3
1078 * "Also, if X was the Designated Router on network segment S
1079 * when the helping relationship began, Y maintains X as the
1080 * Designated Router until the helping relationship is
1082 * When I am helper for this neighbor, I should not trigger the
1083 * ISM Events. Also Intentionally not setting the priority and
1084 * other fields so that when the neighbor exits the Grace
1085 * period, it can handle if there is any change before GR and
1087 if (IS_DEBUG_OSPF_GR
)
1089 "%s, Neighbor is under GR Restart, hence ignoring the ISM Events",
1090 __PRETTY_FUNCTION__
);
1092 /* If neighbor itself declares DR and no BDR exists,
1093 cause event BackupSeen */
1094 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1095 if (hello
->bd_router
.s_addr
== INADDR_ANY
1096 && oi
->state
== ISM_Waiting
)
1097 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1099 /* neighbor itself declares BDR. */
1100 if (oi
->state
== ISM_Waiting
1101 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1103 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1105 /* had not previously. */
1106 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1107 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1108 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1109 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1111 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1113 /* had not previously. */
1114 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1115 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1116 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
,
1118 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1120 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1122 /* Neighbor priority check. */
1123 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1124 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1127 /* Set neighbor information. */
1128 nbr
->priority
= hello
->priority
;
1129 nbr
->d_router
= hello
->d_router
;
1130 nbr
->bd_router
= hello
->bd_router
;
1133 * RFC 3623 - Section 2:
1134 * "If the restarting router determines that it was the Designated
1135 * Router on a given segment prior to the restart, it elects
1136 * itself as the Designated Router again. The restarting router
1137 * knows that it was the Designated Router if, while the
1138 * associated interface is in Waiting state, a Hello packet is
1139 * received from a neighbor listing the router as the Designated
1142 if (oi
->area
->ospf
->gr_info
.restart_in_progress
1143 && oi
->state
== ISM_Waiting
1144 && IPV4_ADDR_SAME(&hello
->d_router
, &oi
->address
->u
.prefix4
))
1145 DR(oi
) = hello
->d_router
;
1148 /* Save DD flags/options/Seqnum received. */
1149 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1150 struct ospf_db_desc
*dd
)
1152 nbr
->last_recv
.flags
= dd
->flags
;
1153 nbr
->last_recv
.options
= dd
->options
;
1154 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1157 /* Process rest of DD packet. */
1158 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1159 struct ospf_neighbor
*nbr
,
1160 struct ospf_db_desc
*dd
, uint16_t size
)
1162 struct ospf_lsa
*new, *find
;
1163 struct lsa_header
*lsah
;
1165 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1166 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1167 size
-= OSPF_LSA_HEADER_SIZE
) {
1168 lsah
= (struct lsa_header
*)stream_pnt(s
);
1169 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1171 /* Unknown LS type. */
1172 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1173 flog_warn(EC_OSPF_PACKET
,
1174 "Packet [DD:RECV]: Unknown LS type %d.",
1176 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1180 if (IS_OPAQUE_LSA(lsah
->type
)
1181 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1182 flog_warn(EC_OSPF_PACKET
,
1183 "LSA[Type%d:%pI4]: Opaque capability mismatch?",
1184 lsah
->type
, &lsah
->id
);
1185 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1189 switch (lsah
->type
) {
1190 case OSPF_AS_EXTERNAL_LSA
:
1191 case OSPF_OPAQUE_AS_LSA
:
1192 /* Check for stub area. Reject if AS-External from stub
1194 allow if from NSSA. */
1195 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1198 "Packet [DD:RECV]: LSA[Type%d:%pI4] from %s area.",
1199 lsah
->type
, &lsah
->id
,
1200 (oi
->area
->external_routing
1204 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1205 NSM_SeqNumberMismatch
);
1213 /* Create LS-request object. */
1214 new = ospf_ls_request_new(lsah
);
1216 /* Lookup received LSA, then add LS request list. */
1217 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1219 /* ospf_lsa_more_recent is fine with NULL pointers */
1220 switch (ospf_lsa_more_recent(find
, new)) {
1222 /* Neighbour has a more recent LSA, we must request it
1224 ospf_ls_request_add(nbr
, new);
1227 /* If we have a copy of this LSA, it's either less
1229 * and we're requesting it from neighbour (the case
1231 * it's as recent and we both have same copy (this
1234 * In neither of these two cases is there any point in
1235 * describing our copy of the LSA to the neighbour in a
1236 * DB-Summary packet, if we're still intending to do so.
1238 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1239 * backward compatible optimisation to OSPF DB Exchange
1241 * DB Description process implemented here.
1244 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1245 ospf_lsa_discard(new);
1248 /* We have the more recent copy, nothing specific to do:
1249 * - no need to request neighbours stale copy
1250 * - must leave DB summary list copy alone
1252 if (IS_DEBUG_OSPF_EVENT
)
1254 "Packet [DD:RECV]: LSA received Type %d, ID %pI4 is not recent.",
1255 lsah
->type
, &lsah
->id
);
1256 ospf_lsa_discard(new);
1261 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1264 /* Both sides have no More, then we're done with Exchange */
1265 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1266 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1268 ospf_db_desc_send(nbr
);
1272 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1274 /* Send DD packet in reply.
1276 * Must be done to acknowledge the Master's DD, regardless of
1277 * whether we have more LSAs ourselves to describe.
1279 * This function will clear the 'More' bit, if after this DD
1280 * we have no more LSAs to describe to the master..
1282 ospf_db_desc_send(nbr
);
1284 /* Slave can raise ExchangeDone now, if master is also done */
1285 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1286 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1289 /* Save received neighbor values from DD. */
1290 ospf_db_desc_save_current(nbr
, dd
);
1293 ospf_ls_req_send(nbr
);
1296 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1297 struct ospf_neighbor
*nbr
)
1299 /* Is DD duplicated? */
1300 if (dd
->options
== nbr
->last_recv
.options
1301 && dd
->flags
== nbr
->last_recv
.flags
1302 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1308 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1309 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1310 struct stream
*s
, struct ospf_interface
*oi
,
1313 struct ospf_db_desc
*dd
;
1314 struct ospf_neighbor
*nbr
;
1316 /* Increment statistics. */
1319 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1321 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1323 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %pI4",
1329 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1330 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1333 "Packet[DD]: Neighbor %pI4 MTU %u is larger than [%s]'s MTU %u",
1334 &nbr
->router_id
, ntohs(dd
->mtu
), IF_NAME(oi
),
1340 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1342 * required. In fact at least JunOS sends DD packets with P bit clear.
1343 * Until proper solution is developped, this hack should help.
1345 * Update: According to the RFCs, N bit is specified /only/ for Hello
1346 * options, unfortunately its use in DD options is not specified. Hence
1348 * implementations follow E-bit semantics and set it in DD options, and
1350 * treat it as unspecified and hence follow the directive "default for
1351 * options is clear", ie unset.
1353 * Reset the flag, as ospfd follows E-bit semantics.
1355 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1356 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1357 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1358 if (IS_DEBUG_OSPF_EVENT
)
1360 "Packet[DD]: Neighbour %pI4: Has NSSA capability, sends with N bit clear in DD options",
1362 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1365 #ifdef REJECT_IF_TBIT_ON
1366 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1368 * In Hello protocol, optional capability must have checked
1369 * to prevent this T-bit enabled router be my neighbor.
1371 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %pI4: T-bit on?",
1375 #endif /* REJECT_IF_TBIT_ON */
1377 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1378 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1380 * This node is not configured to handle O-bit, for now.
1381 * Clear it to ignore unsupported capability proposed by
1384 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1387 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1389 "%s:Packet[DD]: Neighbor %pI4 state is %s, seq_num:0x%x, local:0x%x",
1390 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
1391 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
1392 ntohl(dd
->dd_seqnum
), nbr
->dd_seqnum
);
1394 /* Process DD packet by neighbor status. */
1395 switch (nbr
->state
) {
1399 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1401 "Packet[DD]: Neighbor %pI4 state is %s, packet discarded.",
1403 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1407 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1408 /* If the new state is ExStart, the processing of the current
1409 packet should then continue in this new state by falling
1410 through to case ExStart below. */
1411 if (nbr
->state
!= NSM_ExStart
)
1416 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1417 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1418 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1420 /* We're Slave---obey */
1421 if (CHECK_FLAG(oi
->ospf
->config
,
1422 OSPF_LOG_ADJACENCY_DETAIL
))
1424 "Packet[DD]: Neighbor %pI4 Negotiation done (Slave).",
1427 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1430 UNSET_FLAG(nbr
->dd_flags
,
1431 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1433 /* We're Master, ignore the initial DBD from
1435 if (CHECK_FLAG(oi
->ospf
->config
,
1436 OSPF_LOG_ADJACENCY_DETAIL
))
1438 "Packet[DD]: Neighbor %pI4: Initial DBD from Slave, ignoring.",
1443 /* Ack from the Slave */
1444 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1445 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1446 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1449 "Packet[DD]: Neighbor %pI4 Negotiation done (Master).",
1451 /* Reset I, leaving MS */
1452 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1454 flog_warn(EC_OSPF_PACKET
,
1455 "Packet[DD]: Neighbor %pI4 Negotiation fails.",
1460 /* This is where the real Options are saved */
1461 nbr
->options
= dd
->options
;
1463 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1464 if (IS_DEBUG_OSPF_EVENT
)
1466 "Neighbor[%pI4] is %sOpaque-capable.",
1468 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1472 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1473 && IPV4_ADDR_SAME(&DR(oi
),
1474 &nbr
->address
.u
.prefix4
)) {
1477 "DR-neighbor[%pI4] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1479 /* This situation is undesirable, but not a real
1484 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1486 /* continue processing rest of packet. */
1487 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1490 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1491 if (IS_SET_DD_MS(nbr
->dd_flags
))
1492 /* Master: discard duplicated DD packet. */
1494 "Packet[DD] (Master): Neighbor %pI4 packet duplicated.",
1497 /* Slave: cause to retransmit the last Database
1501 "Packet[DD] [Slave]: Neighbor %pI4 packet duplicated.",
1503 ospf_db_desc_resend(nbr
);
1508 /* Otherwise DD packet should be checked. */
1509 /* Check Master/Slave bit mismatch */
1510 if (IS_SET_DD_MS(dd
->flags
)
1511 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1512 flog_warn(EC_OSPF_PACKET
,
1513 "Packet[DD]: Neighbor %pI4 MS-bit mismatch.",
1515 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1516 if (IS_DEBUG_OSPF_EVENT
)
1518 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1519 dd
->flags
, nbr
->dd_flags
);
1523 /* Check initialize bit is set. */
1524 if (IS_SET_DD_I(dd
->flags
)) {
1525 zlog_info("Packet[DD]: Neighbor %pI4 I-bit set.",
1527 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1531 /* Check DD Options. */
1532 if (dd
->options
!= nbr
->options
) {
1533 flog_warn(EC_OSPF_PACKET
,
1534 "Packet[DD]: Neighbor %pI4 options mismatch.",
1536 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1540 /* Check DD sequence number. */
1541 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1542 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1543 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1544 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1547 "Packet[DD]: Neighbor %pI4 sequence number mismatch.",
1549 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1553 /* Continue processing rest of packet. */
1554 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1558 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1559 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1560 /* Master should discard duplicate DD packet. */
1562 "Packet[DD]: Neighbor %pI4 duplicated, packet discarded.",
1566 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1567 < nbr
->v_inactivity
* 1000000LL) {
1568 /* In states Loading and Full the slave
1570 its last Database Description packet
1572 duplicate Database Description
1574 from the master. For this reason the
1576 wait RouterDeadInterval seconds
1578 last Database Description packet.
1580 Database Description packet from the
1582 this interval will generate a
1584 neighbor event. RFC2328 Section 10.8
1586 ospf_db_desc_resend(nbr
);
1592 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1595 flog_warn(EC_OSPF_PACKET
,
1596 "Packet[DD]: Neighbor %pI4 NSM illegal status %u.",
1597 &nbr
->router_id
, nbr
->state
);
1602 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1604 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1605 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1606 struct stream
*s
, struct ospf_interface
*oi
,
1609 struct ospf_neighbor
*nbr
;
1611 struct in_addr ls_id
;
1612 struct in_addr adv_router
;
1613 struct ospf_lsa
*find
;
1614 struct list
*ls_upd
;
1615 unsigned int length
;
1617 /* Increment statistics. */
1620 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1622 flog_warn(EC_OSPF_PACKET
,
1623 "Link State Request: Unknown Neighbor %pI4",
1628 /* Neighbor State should be Exchange or later. */
1629 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1630 && nbr
->state
!= NSM_Full
) {
1633 "Link State Request received from %pI4: Neighbor state is %s, packet discarded.",
1635 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1639 /* Send Link State Update for ALL requested LSAs. */
1640 ls_upd
= list_new();
1641 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1643 while (size
>= OSPF_LSA_KEY_SIZE
) {
1644 /* Get one slice of Link State Request. */
1645 ls_type
= stream_getl(s
);
1646 ls_id
.s_addr
= stream_get_ipv4(s
);
1647 adv_router
.s_addr
= stream_get_ipv4(s
);
1649 /* Verify LSA type. */
1650 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1651 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1652 list_delete(&ls_upd
);
1656 /* Search proper LSA in LSDB. */
1657 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1660 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1661 list_delete(&ls_upd
);
1665 /* Packet overflows MTU size, send immediately. */
1666 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1667 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1668 ospf_ls_upd_send(nbr
, ls_upd
,
1669 OSPF_SEND_PACKET_DIRECT
, 0);
1671 ospf_ls_upd_send(nbr
, ls_upd
,
1672 OSPF_SEND_PACKET_INDIRECT
, 0);
1674 /* Only remove list contents. Keep ls_upd. */
1675 list_delete_all_node(ls_upd
);
1677 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1680 /* Append LSA to update list. */
1681 listnode_add(ls_upd
, find
);
1682 length
+= ntohs(find
->data
->length
);
1684 size
-= OSPF_LSA_KEY_SIZE
;
1687 /* Send rest of Link State Update. */
1688 if (listcount(ls_upd
) > 0) {
1689 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1690 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1693 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1696 list_delete(&ls_upd
);
1698 list_delete(&ls_upd
);
1701 /* Get the list of LSAs from Link State Update packet.
1702 And process some validation -- RFC2328 Section 13. (1)-(2). */
1703 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1705 struct ospf_interface
*oi
, size_t size
)
1707 uint16_t count
, sum
;
1709 struct lsa_header
*lsah
;
1710 struct ospf_lsa
*lsa
;
1715 count
= stream_getl(s
);
1716 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1718 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1719 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1720 lsah
= (struct lsa_header
*)stream_pnt(s
);
1721 length
= ntohs(lsah
->length
);
1723 if (length
> size
) {
1726 "Link State Update: LSA length exceeds packet size.");
1730 /* Validate the LSA's LS checksum. */
1731 sum
= lsah
->checksum
;
1732 if (!ospf_lsa_checksum_valid(lsah
)) {
1733 /* (bug #685) more details in a one-line message make it
1735 * to identify problem source on the one hand and to
1737 * chance to compress repeated messages in syslog on the
1741 "Link State Update: LSA checksum error %x/%x, ID=%pI4 from: nbr %pI4, router ID %pI4, adv router %pI4",
1742 sum
, lsah
->checksum
, &lsah
->id
,
1743 &nbr
->src
, &nbr
->router_id
,
1748 /* Examine the LSA's LS type. */
1749 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1750 flog_warn(EC_OSPF_PACKET
,
1751 "Link State Update: Unknown LS type %d",
1757 * What if the received LSA's age is greater than MaxAge?
1758 * Treat it as a MaxAge case -- endo.
1760 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1761 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1763 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1764 #ifdef STRICT_OBIT_USAGE_CHECK
1765 if ((IS_OPAQUE_LSA(lsah
->type
)
1766 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1767 || (!IS_OPAQUE_LSA(lsah
->type
)
1768 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1770 * This neighbor must know the exact usage of
1772 * the bit will be set in Type-9,10,11 LSAs
1775 flog_warn(EC_OSPF_PACKET
,
1776 "LSA[Type%d:%pI4]: O-bit abuse?",
1777 lsah
->type
, &lsah
->id
);
1780 #endif /* STRICT_OBIT_USAGE_CHECK */
1782 /* Do not take in AS External Opaque-LSAs if we are a
1784 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1785 && nbr
->oi
->area
->external_routing
1786 != OSPF_AREA_DEFAULT
) {
1787 if (IS_DEBUG_OSPF_EVENT
)
1789 "LSA[Type%d:%pI4]: We are a stub, don't take this LSA.",
1794 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1795 flog_warn(EC_OSPF_PACKET
,
1796 "LSA[Type%d:%pI4]: Opaque capability mismatch?",
1797 lsah
->type
, &lsah
->id
);
1801 /* Create OSPF LSA instance. */
1802 lsa
= ospf_lsa_new_and_data(length
);
1804 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1805 /* We may wish to put some error checking if type NSSA comes in
1806 and area not in NSSA mode */
1807 switch (lsah
->type
) {
1808 case OSPF_AS_EXTERNAL_LSA
:
1809 case OSPF_OPAQUE_AS_LSA
:
1812 case OSPF_OPAQUE_LINK_LSA
:
1813 lsa
->oi
= oi
; /* Remember incoming interface for
1814 flooding control. */
1817 lsa
->area
= oi
->area
;
1821 memcpy(lsa
->data
, lsah
, length
);
1823 if (IS_DEBUG_OSPF_EVENT
)
1825 "LSA[Type%d:%pI4]: %p new LSA created with Link State Update",
1826 lsa
->data
->type
, &lsa
->data
->id
,
1828 listnode_add(lsas
, lsa
);
1834 /* Cleanup Update list. */
1835 static void ospf_upd_list_clean(struct list
*lsas
)
1837 struct listnode
*node
, *nnode
;
1838 struct ospf_lsa
*lsa
;
1840 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1841 ospf_lsa_discard(lsa
);
1846 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1847 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1848 struct ospf_header
*ospfh
, struct stream
*s
,
1849 struct ospf_interface
*oi
, uint16_t size
)
1851 struct ospf_neighbor
*nbr
;
1853 struct listnode
*node
, *nnode
;
1854 struct ospf_lsa
*lsa
= NULL
;
1855 /* unsigned long ls_req_found = 0; */
1857 /* Dis-assemble the stream, update each entry, re-encapsulate for
1860 /* Increment statistics. */
1863 /* Check neighbor. */
1864 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1866 flog_warn(EC_OSPF_PACKET
,
1867 "Link State Update: Unknown Neighbor %pI4 on int: %s",
1868 &ospfh
->router_id
, IF_NAME(oi
));
1872 /* Check neighbor state. */
1873 if (nbr
->state
< NSM_Exchange
) {
1874 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1876 "Link State Update: Neighbor[%pI4] state %s is less than Exchange",
1878 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1883 /* Get list of LSAs from Link State Update packet. - Also performs
1884 * Stages 1 (validate LSA checksum) and 2 (check for LSA consistent
1885 * type) of section 13.
1887 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1891 #define DISCARD_LSA(L, N) \
1893 if (IS_DEBUG_OSPF_EVENT) \
1895 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1897 N, (void *)lsa, (int)lsa->data->type); \
1898 ospf_lsa_discard(L); \
1902 /* Process each LSA received in the one packet.
1904 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1905 * text below are from the steps in RFC 2328, Section 13.
1907 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1908 struct ospf_lsa
*ls_ret
, *current
;
1911 if (IS_DEBUG_OSPF(lsa
, LSA
))
1912 zlog_debug("LSA Type-%d from %pI4, ID: %pI4, ADV: %pI4",
1913 lsa
->data
->type
, &ospfh
->router_id
,
1914 &lsa
->data
->id
, &lsa
->data
->adv_router
);
1916 listnode_delete(lsas
,
1917 lsa
); /* We don't need it in list anymore */
1919 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1922 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1924 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1927 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1930 /* Do take in Type-7's if we are an NSSA */
1932 /* If we are also an ABR, later translate them to a Type-5
1935 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1936 translate them to a separate Type-5 packet. */
1938 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1939 /* Reject from STUB or NSSA */
1940 if (nbr
->oi
->area
->external_routing
1941 != OSPF_AREA_DEFAULT
) {
1942 if (IS_DEBUG_OSPF_NSSA
)
1944 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1945 DISCARD_LSA(lsa
, 1);
1948 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1949 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1950 if (IS_DEBUG_OSPF_NSSA
)
1952 "Incoming NSSA LSA Discarded: Not NSSA Area");
1953 DISCARD_LSA(lsa
, 2);
1956 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1957 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1958 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1959 &lsa
->data
->adv_router
)) {
1961 EC_OSPF_ROUTER_LSA_MISMATCH
,
1962 "Incoming Router-LSA from %pI4 with Adv-ID[%pI4] != LS-ID[%pI4]",
1963 &ospfh
->router_id
, &lsa
->data
->id
,
1964 &lsa
->data
->adv_router
);
1966 EC_OSPF_DOMAIN_CORRUPT
,
1967 "OSPF domain compromised by attack or corruption. Verify correct operation of -ALL- OSPF routers.");
1968 DISCARD_LSA(lsa
, 0);
1971 /* Find the LSA in the current database. */
1973 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1975 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1977 no instance of the LSA in the router's link state database,
1978 and none of router's neighbors are in states Exchange or
1980 then take the following actions: */
1982 if (IS_LSA_MAXAGE(lsa
) && !current
1983 && ospf_check_nbr_status(oi
->ospf
)) {
1984 /* (4a) Response Link State Acknowledgment. */
1985 ospf_ls_ack_send(nbr
, lsa
);
1987 /* (4b) Discard LSA. */
1988 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1990 "Link State Update[%s]: LS age is equal to MaxAge.",
1993 DISCARD_LSA(lsa
, 3);
1996 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1997 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1998 &oi
->ospf
->router_id
)) {
2000 * Even if initial flushing seems to be completed, there
2002 * be a case that self-originated LSA with MaxAge still
2004 * in the routing domain.
2005 * Just send an LSAck message to cease retransmission.
2007 if (IS_LSA_MAXAGE(lsa
)) {
2008 zlog_info("LSA[%s]: Boomerang effect?",
2010 ospf_ls_ack_send(nbr
, lsa
);
2011 ospf_lsa_discard(lsa
);
2013 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2014 ospf_opaque_lsa_refresh_schedule(
2020 * If an instance of self-originated Opaque-LSA is not
2022 * in the LSDB, there are some possible cases here.
2024 * 1) This node lost opaque-capability after restart.
2025 * 2) Else, a part of opaque-type is no more supported.
2026 * 3) Else, a part of opaque-id is no more supported.
2028 * Anyway, it is still this node's responsibility to
2030 * Otherwise, the LSA instance remains in the routing
2032 * until its age reaches to MaxAge.
2034 /* XXX: We should deal with this for *ALL* LSAs, not
2036 if (current
== NULL
) {
2037 if (IS_DEBUG_OSPF_EVENT
)
2039 "LSA[%s]: Previously originated Opaque-LSA,not found in the LSDB.",
2042 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2044 ospf_ls_ack_send(nbr
, lsa
);
2046 if (!ospf
->gr_info
.restart_in_progress
) {
2047 ospf_opaque_self_originated_lsa_received(
2054 /* It might be happen that received LSA is self-originated
2056 * router ID is changed. So, we should check if LSA is a
2058 * Link State ID is one of the router's own IP interface
2059 * addresses but whose
2060 * Advertising Router is not equal to the router's own Router ID
2061 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2065 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2066 struct listnode
*oinode
, *oinnode
;
2067 struct ospf_interface
*out_if
;
2070 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2075 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2077 && (!(IPV4_ADDR_SAME(
2078 &oi
->ospf
->router_id
,
2079 &lsa
->data
->adv_router
)))) {
2080 if (out_if
->network_lsa_self
) {
2081 ospf_lsa_flush_area(
2083 if (IS_DEBUG_OSPF_EVENT
)
2085 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2089 ospf_lsa_discard(lsa
);
2099 /* (5) Find the instance of this LSA that is currently contained
2100 in the router's link state database. If there is no
2101 database copy, or the received LSA is more recent than
2102 the database copy the following steps must be performed.
2103 (The sub steps from RFC 2328 section 13 step (5) will be
2108 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2110 if (current
&& (IS_LSA_MAX_SEQ(current
))
2111 && (IS_LSA_MAX_SEQ(lsa
)) && !IS_LSA_MAXAGE(lsa
)) {
2113 "Link State Update[%s]: has Max Seq and higher checksum but not MaxAge. Dropping it",
2116 DISCARD_LSA(lsa
, 4);
2119 /* Actual flooding procedure. */
2120 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2121 < 0) /* Trap NSSA later. */
2122 DISCARD_LSA(lsa
, 5);
2126 /* (6) Else, If there is an instance of the LSA on the sending
2127 neighbor's Link state request list, an error has occurred in
2128 the Database Exchange process. In this case, restart the
2129 Database Exchange process by generating the neighbor event
2130 BadLSReq for the sending neighbor and stop processing the
2131 Link State Update packet. */
2133 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2134 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2137 "LSA[%s] instance exists on Link state request list",
2140 /* Clean list of LSAs. */
2141 ospf_upd_list_clean(lsas
);
2142 /* this lsa is not on lsas list already. */
2143 ospf_lsa_discard(lsa
);
2147 /* If the received LSA is the same instance as the database copy
2148 (i.e., neither one is more recent) the following two steps
2149 should be performed: */
2152 /* If the LSA is listed in the Link state retransmission
2154 for the receiving adjacency, the router itself is
2156 an acknowledgment for this LSA. The router should
2158 received LSA as an acknowledgment by removing the LSA
2160 the Link state retransmission list. This is termed
2162 "implied acknowledgment". */
2164 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2166 if (ls_ret
!= NULL
) {
2167 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2169 /* Delayed acknowledgment sent if advertisement
2171 from Designated Router, otherwise do nothing.
2173 if (oi
->state
== ISM_Backup
)
2177 ospf_lsa_lock(lsa
));
2179 DISCARD_LSA(lsa
, 6);
2181 /* Acknowledge the receipt of the LSA by sending a
2182 Link State Acknowledgment packet back out the
2186 ospf_ls_ack_send(nbr
, lsa
);
2187 DISCARD_LSA(lsa
, 7);
2191 /* The database copy is more recent. If the database copy
2192 has LS age equal to MaxAge and LS sequence number equal to
2193 MaxSequenceNumber, simply discard the received LSA without
2194 acknowledging it. (In this case, the LSA's LS sequence number
2196 wrapping, and the MaxSequenceNumber LSA must be completely
2197 flushed before any new LSA instance can be introduced). */
2199 else if (ret
> 0) /* Database copy is more recent */
2201 if (IS_LSA_MAXAGE(current
)
2202 && current
->data
->ls_seqnum
2203 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2204 DISCARD_LSA(lsa
, 8);
2206 /* Otherwise, as long as the database copy has not been
2208 Link State Update within the last MinLSArrival
2210 database copy back to the sending neighbor,
2212 a Link State Update Packet. The Link State Update
2214 be sent directly to the neighbor. In so doing, do not
2216 database copy of the LSA on the neighbor's link state
2217 retransmission list, and do not acknowledge the
2219 recent) LSA instance. */
2221 if (monotime_since(¤t
->tv_orig
, NULL
)
2222 >= ospf
->min_ls_arrival
* 1000LL)
2223 /* Trap NSSA type later.*/
2224 ospf_ls_upd_send_lsa(
2226 OSPF_SEND_PACKET_DIRECT
);
2227 DISCARD_LSA(lsa
, 9);
2233 assert(listcount(lsas
) == 0);
2236 if (ospf
->gr_info
.restart_in_progress
)
2237 ospf_gr_check_lsdb_consistency(oi
->ospf
, oi
->area
);
2240 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2241 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2242 struct stream
*s
, struct ospf_interface
*oi
,
2245 struct ospf_neighbor
*nbr
;
2247 /* increment statistics. */
2250 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2252 flog_warn(EC_OSPF_PACKET
,
2253 "Link State Acknowledgment: Unknown Neighbor %pI4",
2258 if (nbr
->state
< NSM_Exchange
) {
2259 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2261 "Link State Acknowledgment: Neighbor[%pI4] state %s is less than Exchange",
2263 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2268 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2269 struct ospf_lsa
*lsa
, *lsr
;
2271 lsa
= ospf_lsa_new();
2272 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2273 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2275 /* lsah = (struct lsa_header *) stream_pnt (s); */
2276 size
-= OSPF_LSA_HEADER_SIZE
;
2277 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2279 if (lsa
->data
->type
< OSPF_MIN_LSA
2280 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2282 ospf_lsa_discard(lsa
);
2286 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2288 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0) {
2289 ospf_ls_retransmit_delete(nbr
, lsr
);
2290 ospf_check_and_gen_init_seq_lsa(oi
, lsa
);
2294 ospf_lsa_discard(lsa
);
2300 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2301 struct interface
**ifp
,
2302 struct stream
*ibuf
)
2307 ifindex_t ifindex
= 0;
2309 /* Header and data both require alignment. */
2310 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2313 memset(&msgh
, 0, sizeof(struct msghdr
));
2314 msgh
.msg_iov
= &iov
;
2315 msgh
.msg_iovlen
= 1;
2316 msgh
.msg_control
= (caddr_t
)buff
;
2317 msgh
.msg_controllen
= sizeof(buff
);
2319 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, MSG_DONTWAIT
,
2320 OSPF_MAX_PACKET_SIZE
+ 1);
2322 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
)
2323 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2324 safe_strerror(errno
));
2327 if ((unsigned int)ret
< sizeof(struct ip
)) {
2330 "ospf_recv_packet: discarding runt packet of length %d (ip header size is %u)",
2331 ret
, (unsigned int)sizeof(iph
));
2335 /* Note that there should not be alignment problems with this assignment
2336 because this is at the beginning of the stream data buffer. */
2337 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2338 sockopt_iphdrincl_swab_systoh(iph
);
2340 ip_len
= iph
->ip_len
;
2342 #if defined(__FreeBSD__) && (__FreeBSD_version < 1000000)
2344 * Kernel network code touches incoming IP header parameters,
2345 * before protocol specific processing.
2347 * 1) Convert byteorder to host representation.
2348 * --> ip_len, ip_id, ip_off
2350 * 2) Adjust ip_len to strip IP header size!
2351 * --> If user process receives entire IP packet via RAW
2352 * socket, it must consider adding IP header size to
2353 * the "ip_len" field of "ip" structure.
2355 * For more details, see <netinet/ip_input.c>.
2357 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2360 #if defined(__DragonFly__)
2362 * in DragonFly's raw socket, ip_len/ip_off are read
2363 * in network byte order.
2364 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2366 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2369 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2371 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2373 if (ret
!= ip_len
) {
2376 "ospf_recv_packet read length mismatch: ip_len is %d, but recvmsg returned %d",
2381 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2382 zlog_debug("%s: fd %d(%s) on interface %d(%s)", __func__
, fd
,
2383 ospf_get_name(ospf
), ifindex
,
2384 *ifp
? (*ifp
)->name
: "Unknown");
2388 static struct ospf_interface
*
2389 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2390 struct ip
*iph
, struct ospf_header
*ospfh
)
2392 struct ospf_interface
*rcv_oi
;
2393 struct ospf_vl_data
*vl_data
;
2394 struct ospf_area
*vl_area
;
2395 struct listnode
*node
;
2397 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2398 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2401 /* look for local OSPF interface matching the destination
2402 * to determine Area ID. We presume therefore the destination address
2403 * is unique, or at least (for "unnumbered" links), not used in other
2406 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2410 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2412 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2416 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2417 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2418 if (IS_DEBUG_OSPF_EVENT
)
2419 zlog_debug("associating packet with %s",
2420 IF_NAME(vl_data
->vl_oi
));
2421 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2422 if (IS_DEBUG_OSPF_EVENT
)
2424 "This VL is not up yet, sorry");
2428 return vl_data
->vl_oi
;
2432 if (IS_DEBUG_OSPF_EVENT
)
2433 zlog_debug("couldn't find any VL to associate the packet with");
2438 static int ospf_check_area_id(struct ospf_interface
*oi
,
2439 struct ospf_header
*ospfh
)
2441 /* Check match the Area ID of the receiving interface. */
2442 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2448 /* Unbound socket will accept any Raw IP packets if proto is matched.
2449 To prevent it, compare src IP address and i/f address with masking
2450 i/f network mask. */
2451 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2452 struct in_addr ip_src
)
2454 struct in_addr mask
, me
, him
;
2456 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2457 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2460 /* Ignore mask check for max prefix length (32) */
2461 if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
2462 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
)
2465 masklen2ip(oi
->address
->prefixlen
, &mask
);
2467 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2468 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2470 if (IPV4_ADDR_SAME(&me
, &him
))
2476 /* Return 1, if the packet is properly authenticated and checksummed,
2477 0 otherwise. In particular, check that AuType header field is valid and
2478 matches the locally configured AuType, and that D.5 requirements are met. */
2479 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2481 struct crypt_key
*ck
;
2482 uint16_t iface_auth_type
;
2483 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2485 switch (pkt_auth_type
) {
2486 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2487 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2488 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2491 "interface %s: auth-type mismatch, local %s, rcvd Null",
2493 lookup_msg(ospf_auth_type_str
,
2494 iface_auth_type
, NULL
));
2497 if (!ospf_check_sum(ospfh
)) {
2498 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2501 "interface %s: Null auth OK, but checksum error, Router-ID %pI4",
2507 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2508 if (OSPF_AUTH_SIMPLE
2509 != (iface_auth_type
= ospf_auth_type(oi
))) {
2510 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2513 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2515 lookup_msg(ospf_auth_type_str
,
2516 iface_auth_type
, NULL
));
2519 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2520 OSPF_AUTH_SIMPLE_SIZE
)) {
2521 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2522 flog_warn(EC_OSPF_PACKET
,
2523 "interface %s: Simple auth failed",
2527 if (!ospf_check_sum(ospfh
)) {
2528 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2531 "interface %s: Simple auth OK, checksum error, Router-ID %pI4",
2537 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2538 if (OSPF_AUTH_CRYPTOGRAPHIC
2539 != (iface_auth_type
= ospf_auth_type(oi
))) {
2540 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2543 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2545 lookup_msg(ospf_auth_type_str
,
2546 iface_auth_type
, NULL
));
2549 if (ospfh
->checksum
) {
2550 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2553 "interface %s: OSPF header checksum is not 0",
2557 /* only MD5 crypto method can pass ospf_packet_examin() */
2558 if (NULL
== (ck
= listgetdata(
2559 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2560 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2561 /* Condition above uses the last key ID on the list,
2563 different from what ospf_crypt_key_lookup() does. A
2565 !ospf_check_md5_digest(oi
, ospfh
)) {
2566 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2567 flog_warn(EC_OSPF_MD5
,
2568 "interface %s: MD5 auth failed",
2574 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2577 "interface %s: invalid packet auth-type (%02x)",
2578 IF_NAME(oi
), pkt_auth_type
);
2583 static int ospf_check_sum(struct ospf_header
*ospfh
)
2588 /* clear auth_data for checksum. */
2589 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2591 /* keep checksum and clear. */
2592 sum
= ospfh
->checksum
;
2593 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2595 /* calculate checksum. */
2596 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2599 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2607 /* Verify, that given link/TOS records are properly sized/aligned and match
2608 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2609 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2611 const uint16_t num_links
)
2613 unsigned counted_links
= 0, thislinklen
;
2615 while (linkbytes
>= OSPF_ROUTER_LSA_LINK_SIZE
) {
2617 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2618 if (thislinklen
> linkbytes
) {
2619 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2620 zlog_debug("%s: length error in link block #%u",
2621 __func__
, counted_links
);
2624 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2625 linkbytes
-= thislinklen
;
2628 if (counted_links
!= num_links
) {
2629 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2630 zlog_debug("%s: %u link blocks declared, %u present",
2631 __func__
, num_links
, counted_links
);
2637 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2638 minimum length constraint). */
2639 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2640 const uint8_t headeronly
)
2643 struct router_lsa
*rlsa
;
2644 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2645 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2646 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2647 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2648 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2652 switch (lsah
->type
) {
2653 case OSPF_ROUTER_LSA
: {
2655 * RFC2328 A.4.2, LSA header + 4 bytes followed by N>=0
2656 * (12+)-byte link blocks
2658 size_t linkbytes_len
= lsalen
- OSPF_LSA_HEADER_SIZE
2659 - OSPF_ROUTER_LSA_MIN_SIZE
;
2662 * LSA link blocks are variable length but always multiples of
2663 * 4; basic sanity check
2665 if (linkbytes_len
% 4 != 0)
2671 rlsa
= (struct router_lsa
*)lsah
;
2673 ret
= ospf_router_lsa_links_examin(
2674 (struct router_lsa_link
*)rlsa
->link
,
2676 ntohs(rlsa
->links
));
2679 case OSPF_AS_EXTERNAL_LSA
:
2680 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2682 case OSPF_AS_NSSA_LSA
:
2683 /* RFC3101 C, idem */
2684 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2685 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2690 /* Following LSA types are considered OK length-wise as soon as their
2692 * length constraint is met and length of the whole LSA is a multiple of
2694 * (basic LSA header size is already a multiple of 4). */
2695 case OSPF_NETWORK_LSA
:
2696 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2697 case OSPF_SUMMARY_LSA
:
2698 case OSPF_ASBR_SUMMARY_LSA
:
2699 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2701 case OSPF_OPAQUE_LINK_LSA
:
2702 case OSPF_OPAQUE_AREA_LSA
:
2703 case OSPF_OPAQUE_AS_LSA
:
2704 /* RFC5250 A.2, "some number of octets (of application-specific
2705 * data) padded to 32-bit alignment." This is considered
2707 * to 4-byte alignment of all other LSA types, see
2708 * OSPF-ALIGNMENT.txt
2709 * file for the detailed analysis of this passage. */
2710 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2713 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2714 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2718 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2719 zlog_debug("%s: alignment error in %s", __func__
,
2720 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2724 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2725 includes verification of LSA blocks length/alignment and dispatching
2726 of deeper-level checks. */
2728 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2729 size_t length
, const uint8_t headeronly
,
2730 /* When declared_num_lsas is not 0, compare it to the real
2732 and treat the difference as an error. */
2733 const uint32_t declared_num_lsas
)
2735 uint32_t counted_lsas
= 0;
2739 if (length
< OSPF_LSA_HEADER_SIZE
) {
2740 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2742 "%s: undersized (%zu B) trailing (#%u) LSA header",
2743 __func__
, length
, counted_lsas
);
2746 /* save on ntohs() calls here and in the LSA validator */
2747 lsalen
= ntohs(lsah
->length
);
2748 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2749 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2751 "%s: malformed LSA header #%u, declared length is %u B",
2752 __func__
, counted_lsas
, lsalen
);
2756 /* less checks here and in ospf_lsa_examin() */
2757 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2758 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2760 "%s: malformed header-only LSA #%u",
2761 __func__
, counted_lsas
);
2764 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2765 + OSPF_LSA_HEADER_SIZE
);
2766 length
-= OSPF_LSA_HEADER_SIZE
;
2768 /* make sure the input buffer is deep enough before
2770 if (lsalen
> length
) {
2771 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2773 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2774 __func__
, counted_lsas
, lsalen
,
2778 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2779 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2780 zlog_debug("%s: malformed LSA #%u",
2781 __func__
, counted_lsas
);
2784 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2790 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2791 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2793 "%s: #LSAs declared (%u) does not match actual (%u)",
2794 __func__
, declared_num_lsas
, counted_lsas
);
2800 /* Verify a complete OSPF packet for proper sizing/alignment. */
2801 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2802 const unsigned bytesonwire
)
2804 uint16_t bytesdeclared
, bytesauth
;
2806 struct ospf_ls_update
*lsupd
;
2808 /* Length, 1st approximation. */
2809 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2810 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2811 zlog_debug("%s: undersized (%u B) packet", __func__
,
2815 /* Now it is safe to access header fields. Performing length check,
2817 * for possible extra bytes of crypto auth/padding, which are not
2819 * in the OSPF header "length" field. */
2820 if (oh
->version
!= OSPF_VERSION
) {
2821 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2822 zlog_debug("%s: invalid (%u) protocol version",
2823 __func__
, oh
->version
);
2826 bytesdeclared
= ntohs(oh
->length
);
2827 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2830 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2831 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2833 "%s: unsupported crypto auth length (%u B)",
2834 __func__
, oh
->u
.crypt
.auth_data_len
);
2837 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2839 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2840 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2842 "%s: packet length error (%u real, %u+%u declared)",
2843 __func__
, bytesonwire
, bytesdeclared
,
2847 /* Length, 2nd approximation. The type-specific constraint is checked
2848 against declared length, not amount of bytes on wire. */
2849 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2851 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2852 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2853 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2855 lookup_msg(ospf_packet_type_str
, oh
->type
,
2860 case OSPF_MSG_HELLO
:
2861 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2863 by N>=0 router-IDs. */
2864 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2869 case OSPF_MSG_DB_DESC
:
2870 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2872 by N>=0 header-only LSAs. */
2873 ret
= ospf_lsaseq_examin(
2874 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2875 + OSPF_DB_DESC_MIN_SIZE
),
2876 bytesdeclared
- OSPF_HEADER_SIZE
2877 - OSPF_DB_DESC_MIN_SIZE
,
2878 1, /* header-only LSAs */
2881 case OSPF_MSG_LS_REQ
:
2882 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2883 * request blocks. */
2884 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2889 case OSPF_MSG_LS_UPD
:
2890 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2892 by N>=0 full LSAs (with N declared beforehand). */
2893 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2894 + OSPF_HEADER_SIZE
);
2895 ret
= ospf_lsaseq_examin(
2896 (struct lsa_header
*)((caddr_t
)lsupd
2897 + OSPF_LS_UPD_MIN_SIZE
),
2898 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2900 ntohl(lsupd
->num_lsas
) /* 32 bits */
2903 case OSPF_MSG_LS_ACK
:
2904 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2906 ret
= ospf_lsaseq_examin(
2907 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2908 + OSPF_LS_ACK_MIN_SIZE
),
2909 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2910 1, /* header-only LSAs */
2914 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2915 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2919 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2920 zlog_debug("%s: malformed %s packet", __func__
,
2921 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2925 /* OSPF Header verification. */
2926 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2927 struct ip
*iph
, struct ospf_header
*ospfh
)
2929 /* Check Area ID. */
2930 if (!ospf_check_area_id(oi
, ospfh
)) {
2931 flog_warn(EC_OSPF_PACKET
,
2932 "interface %s: ospf_read invalid Area ID %pI4",
2933 IF_NAME(oi
), &ospfh
->area_id
);
2937 /* Check network mask, Silently discarded. */
2938 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2941 "interface %s: ospf_read network address is not same [%pI4]",
2942 IF_NAME(oi
), &iph
->ip_src
);
2946 /* Check authentication. The function handles logging actions, where
2948 if (!ospf_check_auth(oi
, ospfh
))
2954 enum ospf_read_return_enum
{
2959 static enum ospf_read_return_enum
ospf_read_helper(struct ospf
*ospf
)
2962 struct stream
*ibuf
;
2963 struct ospf_interface
*oi
;
2965 struct ospf_header
*ospfh
;
2967 struct connected
*c
;
2968 struct interface
*ifp
= NULL
;
2970 stream_reset(ospf
->ibuf
);
2971 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2973 return OSPF_READ_ERROR
;
2976 * This raw packet is known to be at least as big as its
2977 * IP header. Note that there should not be alignment problems with
2978 * this assignment because this is at the beginning of the
2979 * stream data buffer.
2981 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2983 * Note that sockopt_iphdrincl_swab_systoh was called in
2988 * Handle cases where the platform does not support
2989 * retrieving the ifindex, and also platforms (such as
2990 * Solaris 8) that claim to support ifindex retrieval but do
2993 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2998 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3000 "%s: Unable to determine incoming interface from: %pI4(%s)",
3001 __func__
, &iph
->ip_src
,
3002 ospf_get_name(ospf
));
3003 return OSPF_READ_CONTINUE
;
3007 if (ospf
->vrf_id
== VRF_DEFAULT
&& ospf
->vrf_id
!= ifp
->vrf
->vrf_id
) {
3009 * We may have a situation where l3mdev_accept == 1
3010 * let's just kindly drop the packet and move on.
3011 * ospf really really really does not like when
3012 * we receive the same packet multiple times.
3014 return OSPF_READ_CONTINUE
;
3017 /* Self-originated packet should be discarded silently. */
3018 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
3019 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
3021 "ospf_read[%pI4]: Dropping self-originated packet",
3024 return OSPF_READ_CONTINUE
;
3027 /* Check that we have enough for an IP header */
3028 if ((unsigned int)(iph
->ip_hl
<< 2) >= STREAM_READABLE(ibuf
)) {
3029 if ((unsigned int)(iph
->ip_hl
<< 2) == STREAM_READABLE(ibuf
)) {
3032 "Rx'd IP packet with OSPF protocol number but no payload");
3036 "IP header length field claims header is %u bytes, but we only have %zu",
3037 (unsigned int)(iph
->ip_hl
<< 2),
3038 STREAM_READABLE(ibuf
));
3041 return OSPF_READ_ERROR
;
3043 stream_forward_getp(ibuf
, iph
->ip_hl
<< 2);
3045 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3047 != ospf_packet_examin(ospfh
, stream_get_endp(ibuf
)
3048 - stream_get_getp(ibuf
)))
3049 return OSPF_READ_CONTINUE
;
3050 /* Now it is safe to access all fields of OSPF packet header. */
3052 /* associate packet with ospf interface */
3053 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3056 * ospf_verify_header() relies on a valid "oi" and thus can be called
3057 * only after the passive/backbone/other checks below are passed.
3058 * These checks in turn access the fields of unverified "ospfh"
3059 * structure for their own purposes and must remain very accurate
3063 /* If incoming interface is passive one, ignore it. */
3064 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3065 if (IS_DEBUG_OSPF_EVENT
)
3067 "ignoring packet from router %pI4 sent to %pI4, received on a passive interface, %pI4",
3068 &ospfh
->router_id
, &iph
->ip_dst
,
3069 &oi
->address
->u
.prefix4
);
3071 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3072 /* Try to fix multicast membership.
3073 * Some OS:es may have problems in this area,
3074 * make sure it is removed.
3076 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3077 ospf_if_set_multicast(oi
);
3079 return OSPF_READ_CONTINUE
;
3083 /* if no local ospf_interface,
3084 * or header area is backbone but ospf_interface is not
3085 * check for VLINK interface
3088 || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3089 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3090 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3092 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3094 "Packet from [%pI4] received on link %s but no ospf_interface",
3095 &iph
->ip_src
, ifp
->name
);
3096 return OSPF_READ_CONTINUE
;
3101 * else it must be a local ospf interface, check it was
3102 * received on correct link
3104 else if (oi
->ifp
!= ifp
) {
3105 if (IS_DEBUG_OSPF_EVENT
)
3106 flog_warn(EC_OSPF_PACKET
,
3107 "Packet from [%pI4] received on wrong link %s",
3108 &iph
->ip_src
, ifp
->name
);
3109 return OSPF_READ_CONTINUE
;
3110 } else if (oi
->state
== ISM_Down
) {
3113 "Ignoring packet from %pI4 to %pI4 received on interface that is down [%s]; interface flags are %s",
3114 &iph
->ip_src
, &iph
->ip_dst
, ifp
->name
,
3115 if_flag_dump(ifp
->flags
));
3116 /* Fix multicast memberships? */
3117 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3118 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3119 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3120 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3121 if (oi
->multicast_memberships
)
3122 ospf_if_set_multicast(oi
);
3123 return OSPF_READ_CONTINUE
;
3127 * If the received packet is destined for AllDRouters, the
3128 * packet should be accepted only if the received ospf
3129 * interface state is either DR or Backup -- endo.
3131 * I wonder who endo is?
3133 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3134 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3137 "Dropping packet for AllDRouters from [%pI4] via [%s] (ISM: %s)",
3138 &iph
->ip_src
, IF_NAME(oi
),
3139 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3140 /* Try to fix multicast membership. */
3141 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3142 ospf_if_set_multicast(oi
);
3143 return OSPF_READ_CONTINUE
;
3146 /* Verify more OSPF header fields. */
3147 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3149 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3151 "ospf_read[%pI4]: Header check failed, dropping.",
3153 return OSPF_READ_CONTINUE
;
3156 /* Show debug receiving packet. */
3157 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3158 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3160 "-----------------------------------------------------");
3161 ospf_packet_dump(ibuf
);
3164 zlog_debug("%s received from [%pI4] via [%s]",
3165 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3166 &ospfh
->router_id
, IF_NAME(oi
));
3167 zlog_debug(" src [%pI4],", &iph
->ip_src
);
3168 zlog_debug(" dst [%pI4]", &iph
->ip_dst
);
3170 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3172 "-----------------------------------------------------");
3175 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3177 /* Adjust size to message length. */
3178 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3180 /* Read rest of the packet and call each sort of packet routine.
3182 switch (ospfh
->type
) {
3183 case OSPF_MSG_HELLO
:
3184 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3186 case OSPF_MSG_DB_DESC
:
3187 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3189 case OSPF_MSG_LS_REQ
:
3190 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3192 case OSPF_MSG_LS_UPD
:
3193 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3195 case OSPF_MSG_LS_ACK
:
3196 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3201 "interface %s(%s): OSPF packet header type %d is illegal",
3202 IF_NAME(oi
), ospf_get_name(ospf
), ospfh
->type
);
3206 return OSPF_READ_CONTINUE
;
3209 /* Starting point of packet process function. */
3210 void ospf_read(struct thread
*thread
)
3214 enum ospf_read_return_enum ret
;
3216 /* first of all get interface pointer. */
3217 ospf
= THREAD_ARG(thread
);
3219 /* prepare for next packet. */
3220 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
3222 while (count
< ospf
->write_oi_count
) {
3224 ret
= ospf_read_helper(ospf
);
3226 case OSPF_READ_ERROR
:
3228 case OSPF_READ_CONTINUE
:
3234 /* Make OSPF header. */
3235 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3238 struct ospf_header
*ospfh
;
3240 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3242 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3243 ospfh
->type
= (uint8_t)type
;
3245 ospfh
->router_id
= oi
->ospf
->router_id
;
3247 ospfh
->checksum
= 0;
3248 ospfh
->area_id
= oi
->area
->area_id
;
3249 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3251 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3253 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3256 /* Make Authentication Data. */
3257 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3259 struct crypt_key
*ck
;
3261 switch (ospf_auth_type(oi
)) {
3262 case OSPF_AUTH_NULL
:
3263 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3266 case OSPF_AUTH_SIMPLE
:
3267 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3268 OSPF_AUTH_SIMPLE_SIZE
);
3270 case OSPF_AUTH_CRYPTOGRAPHIC
:
3271 /* If key is not set, then set 0. */
3272 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3273 ospfh
->u
.crypt
.zero
= 0;
3274 ospfh
->u
.crypt
.key_id
= 0;
3275 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3278 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3279 ospfh
->u
.crypt
.zero
= 0;
3280 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3281 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3283 /* note: the seq is done in ospf_make_md5_digest() */
3286 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3294 /* Fill rest of OSPF header. */
3295 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3298 struct ospf_header
*ospfh
;
3300 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3303 ospfh
->length
= htons(length
);
3305 /* Calculate checksum. */
3306 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3307 ospfh
->checksum
= in_cksum(ospfh
, length
);
3309 ospfh
->checksum
= 0;
3311 /* Add Authentication Data. */
3312 ospf_make_auth(oi
, ospfh
);
3315 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3317 struct ospf_neighbor
*nbr
;
3318 struct route_node
*rn
;
3319 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3320 struct in_addr mask
;
3324 /* Set netmask of interface. */
3325 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3326 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3327 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3328 masklen2ip(oi
->address
->prefixlen
, &mask
);
3330 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3331 stream_put_ipv4(s
, mask
.s_addr
);
3333 /* Set Hello Interval. */
3334 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3335 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3337 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3339 if (IS_DEBUG_OSPF_EVENT
)
3340 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3344 stream_putc(s
, OPTIONS(oi
));
3346 /* Set Router Priority. */
3347 stream_putc(s
, PRIORITY(oi
));
3349 /* Set Router Dead Interval. */
3350 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3352 /* Set Designated Router. */
3353 stream_put_ipv4(s
, DR(oi
).s_addr
);
3355 p
= stream_get_endp(s
);
3357 /* Set Backup Designated Router. */
3358 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3360 /* Add neighbor seen. */
3361 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3362 if ((nbr
= rn
->info
))
3363 if (nbr
->router_id
.s_addr
3364 != INADDR_ANY
) /* Ignore 0.0.0.0 node. */
3366 != NSM_Attempt
) /* Ignore Down neighbor. */
3368 != NSM_Down
) /* This is myself for
3370 if (!IPV4_ADDR_SAME(
3372 &oi
->ospf
->router_id
)) {
3373 /* Check neighbor is
3375 if (nbr
->d_router
.s_addr
3389 /* Hello packet overflows interface MTU. */
3390 if (length
+ sizeof(uint32_t)
3391 > ospf_packet_max(oi
)) {
3393 EC_OSPF_LARGE_HELLO
,
3394 "Oversized Hello packet! Larger than MTU. Not sending it out");
3405 /* Let neighbor generate BackupSeen. */
3407 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3412 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3413 struct ospf_neighbor
*nbr
, struct stream
*s
)
3415 struct ospf_lsa
*lsa
;
3416 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3420 struct ospf_lsdb
*lsdb
;
3422 /* Set Interface MTU. */
3423 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3426 stream_putw(s
, oi
->ifp
->mtu
);
3429 options
= OPTIONS(oi
);
3430 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3431 SET_FLAG(options
, OSPF_OPTION_O
);
3432 stream_putc(s
, options
);
3435 pp
= stream_get_endp(s
);
3436 stream_putc(s
, nbr
->dd_flags
);
3438 /* Set DD Sequence Number. */
3439 stream_putl(s
, nbr
->dd_seqnum
);
3441 /* shortcut unneeded walk of (empty) summary LSDBs */
3442 if (ospf_db_summary_isempty(nbr
))
3445 /* Describe LSA Header from Database Summary List. */
3446 lsdb
= &nbr
->db_sum
;
3448 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3449 struct route_table
*table
= lsdb
->type
[i
].db
;
3450 struct route_node
*rn
;
3452 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3453 if ((lsa
= rn
->info
) != NULL
) {
3454 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3455 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3456 /* Suppress advertising
3457 * opaque-information. */
3458 /* Remove LSA from DB summary list. */
3459 ospf_lsdb_delete(lsdb
, lsa
);
3463 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3464 struct lsa_header
*lsah
;
3467 /* DD packet overflows interface MTU. */
3468 if (length
+ OSPF_LSA_HEADER_SIZE
3469 > ospf_packet_max(oi
))
3472 /* Keep pointer to LS age. */
3473 lsah
= (struct lsa_header
3478 /* Proceed stream pointer. */
3479 stream_put(s
, lsa
->data
,
3480 OSPF_LSA_HEADER_SIZE
);
3481 length
+= OSPF_LSA_HEADER_SIZE
;
3484 ls_age
= LS_AGE(lsa
);
3485 lsah
->ls_age
= htons(ls_age
);
3488 /* Remove LSA from DB summary list. */
3489 ospf_lsdb_delete(lsdb
, lsa
);
3493 /* Update 'More' bit */
3494 if (ospf_db_summary_isempty(nbr
)) {
3496 if (nbr
->state
>= NSM_Exchange
) {
3497 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3498 /* Rewrite DD flags */
3499 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3501 assert(IS_SET_DD_M(nbr
->dd_flags
));
3507 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3508 unsigned long delta
, struct ospf_neighbor
*nbr
,
3509 struct ospf_lsa
*lsa
)
3511 struct ospf_interface
*oi
;
3515 /* LS Request packet overflows interface MTU
3516 * delta is just number of bytes required for 1 LS Req
3517 * ospf_packet_max will return the number of bytes can
3518 * be accomodated without ospf header. So length+delta
3519 * can be compared to ospf_packet_max
3520 * to check if it can fit another lsreq in the same packet.
3523 if (*length
+ delta
> ospf_packet_max(oi
))
3526 stream_putl(s
, lsa
->data
->type
);
3527 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3528 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3530 ospf_lsa_unlock(&nbr
->ls_req_last
);
3531 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3537 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3539 struct ospf_lsa
*lsa
;
3540 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3541 unsigned long delta
= 12;
3542 struct route_table
*table
;
3543 struct route_node
*rn
;
3545 struct ospf_lsdb
*lsdb
;
3547 lsdb
= &nbr
->ls_req
;
3549 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3550 table
= lsdb
->type
[i
].db
;
3551 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3552 if ((lsa
= (rn
->info
)) != NULL
)
3553 if (ospf_make_ls_req_func(s
, &length
, delta
,
3556 route_unlock_node(rn
);
3563 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3567 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3569 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3572 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3575 struct ospf_lsa
*lsa
;
3576 struct listnode
*node
;
3577 uint16_t length
= 0;
3578 unsigned int size_noauth
;
3579 unsigned long delta
= stream_get_endp(s
);
3583 if (IS_DEBUG_OSPF_EVENT
)
3584 zlog_debug("ospf_make_ls_upd: Start");
3586 pp
= stream_get_endp(s
);
3587 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3588 length
+= OSPF_LS_UPD_MIN_SIZE
;
3590 /* Calculate amount of packet usable for data. */
3591 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3593 while ((node
= listhead(update
)) != NULL
) {
3594 struct lsa_header
*lsah
;
3597 lsa
= listgetdata(node
);
3600 if (IS_DEBUG_OSPF_EVENT
)
3601 zlog_debug("%s: List Iteration %d LSA[%s]", __func__
,
3602 count
, dump_lsa_key(lsa
));
3604 /* Will it fit? Minimum it has to fit atleast one */
3605 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3609 /* Keep pointer to LS age. */
3610 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3611 + stream_get_endp(s
));
3613 /* Put LSA to Link State Request. */
3614 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3617 /* each hop must increment an lsa_age by transmit_delay
3618 of OSPF interface */
3619 ls_age
= ls_age_increment(lsa
,
3620 OSPF_IF_PARAM(oi
, transmit_delay
));
3621 lsah
->ls_age
= htons(ls_age
);
3623 length
+= ntohs(lsa
->data
->length
);
3626 list_delete_node(update
, node
);
3627 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3630 /* Now set #LSAs. */
3631 stream_putl_at(s
, pp
, count
);
3633 if (IS_DEBUG_OSPF_EVENT
)
3634 zlog_debug("ospf_make_ls_upd: Stop");
3638 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3641 struct listnode
*node
, *nnode
;
3642 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3643 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3644 struct ospf_lsa
*lsa
;
3646 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3649 /* LS Ack packet overflows interface MTU
3650 * delta is just number of bytes required for
3651 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3652 * the number of bytes can be accomodated without
3653 * ospf header. So length+delta can be compared
3654 * against ospf_packet_max to check if it can fit
3655 * another ls header in the same packet.
3657 if ((length
+ delta
) > ospf_packet_max(oi
))
3660 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3661 length
+= OSPF_LSA_HEADER_SIZE
;
3663 listnode_delete(ack
, lsa
);
3664 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3670 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3672 struct ospf_packet
*op
;
3673 uint16_t length
= OSPF_HEADER_SIZE
;
3675 op
= ospf_packet_new(oi
->ifp
->mtu
);
3677 /* Prepare OSPF common header. */
3678 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3680 /* Prepare OSPF Hello body. */
3681 length
+= ospf_make_hello(oi
, op
->s
);
3682 if (length
== OSPF_HEADER_SIZE
) {
3683 /* Hello overshooting MTU */
3684 ospf_packet_free(op
);
3688 /* Fill OSPF header. */
3689 ospf_fill_header(oi
, op
->s
, length
);
3691 /* Set packet length. */
3692 op
->length
= length
;
3694 op
->dst
.s_addr
= addr
;
3696 if (IS_DEBUG_OSPF_EVENT
) {
3697 if (oi
->ospf
->vrf_id
)
3699 "%s: Hello Tx interface %s ospf vrf %s id %u",
3700 __func__
, oi
->ifp
->name
,
3701 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3704 /* Add packet to the top of the interface output queue, so that they
3705 * can't get delayed by things like long queues of LS Update packets
3707 ospf_packet_add_top(oi
, op
);
3709 /* Hook thread to write packet. */
3710 OSPF_ISM_WRITE_ON(oi
->ospf
);
3713 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3715 struct ospf_interface
*oi
;
3720 /* If this is passive interface, do not send OSPF Hello. */
3721 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3724 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3727 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3730 if (PRIORITY(oi
) == 0)
3733 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3734 && oi
->state
!= ISM_Backup
)
3737 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3740 void ospf_poll_timer(struct thread
*thread
)
3742 struct ospf_nbr_nbma
*nbr_nbma
;
3744 nbr_nbma
= THREAD_ARG(thread
);
3745 nbr_nbma
->t_poll
= NULL
;
3747 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3748 zlog_debug("NSM[%s:%pI4]: Timer (Poll timer expire)",
3749 IF_NAME(nbr_nbma
->oi
), &nbr_nbma
->addr
);
3751 ospf_poll_send(nbr_nbma
);
3753 if (nbr_nbma
->v_poll
> 0)
3754 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3759 void ospf_hello_reply_timer(struct thread
*thread
)
3761 struct ospf_neighbor
*nbr
;
3763 nbr
= THREAD_ARG(thread
);
3764 nbr
->t_hello_reply
= NULL
;
3766 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3767 zlog_debug("NSM[%s:%pI4]: Timer (hello-reply timer expire)",
3768 IF_NAME(nbr
->oi
), &nbr
->router_id
);
3770 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3773 /* Send OSPF Hello. */
3774 void ospf_hello_send(struct ospf_interface
*oi
)
3776 /* If this is passive interface, do not send OSPF Hello. */
3777 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3780 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3781 struct ospf_neighbor
*nbr
;
3782 struct route_node
*rn
;
3784 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3785 if ((nbr
= rn
->info
))
3786 if (nbr
!= oi
->nbr_self
)
3787 if (nbr
->state
!= NSM_Down
) {
3788 /* RFC 2328 Section 9.5.1
3789 If the router is not
3790 eligible to become Designated
3792 it must periodically send
3793 Hello Packets to both the
3794 Designated Router and the
3795 Backup Designated Router (if
3798 if (PRIORITY(oi
) == 0
3809 /* If the router is eligible to
3810 become Designated Router, it
3811 must periodically send Hello
3812 Packets to all neighbors that
3813 are also eligible. In
3814 addition, if the router is
3816 Designated Router or Backup
3817 Designated Router, it must
3819 send periodic Hello Packets
3820 to all other neighbors. */
3822 if (nbr
->priority
== 0
3823 && oi
->state
== ISM_DROther
)
3825 /* if oi->state == Waiting, send
3826 * hello to all neighbors */
3827 ospf_hello_send_sub(
3829 nbr
->address
.u
.prefix4
3833 /* Decide destination address. */
3834 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3835 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3837 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3841 /* Send OSPF Database Description. */
3842 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3844 struct ospf_interface
*oi
;
3845 struct ospf_packet
*op
;
3846 uint16_t length
= OSPF_HEADER_SIZE
;
3849 op
= ospf_packet_new(oi
->ifp
->mtu
);
3851 /* Prepare OSPF common header. */
3852 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3854 /* Prepare OSPF Database Description body. */
3855 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3857 /* Fill OSPF header. */
3858 ospf_fill_header(oi
, op
->s
, length
);
3860 /* Set packet length. */
3861 op
->length
= length
;
3863 /* Decide destination address. */
3864 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3865 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3867 op
->dst
= nbr
->address
.u
.prefix4
;
3869 /* Add packet to the interface output queue. */
3870 ospf_packet_add(oi
, op
);
3872 /* Hook thread to write packet. */
3873 OSPF_ISM_WRITE_ON(oi
->ospf
);
3875 /* Remove old DD packet, then copy new one and keep in neighbor
3878 ospf_packet_free(nbr
->last_send
);
3879 nbr
->last_send
= ospf_packet_dup(op
);
3880 monotime(&nbr
->last_send_ts
);
3881 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3883 "%s:Packet[DD]: %pI4 DB Desc send with seqnum:%x , flags:%x",
3884 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
3885 nbr
->dd_seqnum
, nbr
->dd_flags
);
3888 /* Re-send Database Description. */
3889 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3891 struct ospf_interface
*oi
;
3895 /* Add packet to the interface output queue. */
3896 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3898 /* Hook thread to write packet. */
3899 OSPF_ISM_WRITE_ON(oi
->ospf
);
3900 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3902 "%s:Packet[DD]: %pI4 DB Desc resend with seqnum:%x , flags:%x",
3903 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
3904 nbr
->dd_seqnum
, nbr
->dd_flags
);
3907 /* Send Link State Request. */
3908 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3910 struct ospf_interface
*oi
;
3911 struct ospf_packet
*op
;
3912 uint16_t length
= OSPF_HEADER_SIZE
;
3915 op
= ospf_packet_new(oi
->ifp
->mtu
);
3917 /* Prepare OSPF common header. */
3918 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3920 /* Prepare OSPF Link State Request body. */
3921 length
+= ospf_make_ls_req(nbr
, op
->s
);
3922 if (length
== OSPF_HEADER_SIZE
) {
3923 ospf_packet_free(op
);
3927 /* Fill OSPF header. */
3928 ospf_fill_header(oi
, op
->s
, length
);
3930 /* Set packet length. */
3931 op
->length
= length
;
3933 /* Decide destination address. */
3934 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3935 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3937 op
->dst
= nbr
->address
.u
.prefix4
;
3939 /* Add packet to the interface output queue. */
3940 ospf_packet_add(oi
, op
);
3942 /* Hook thread to write packet. */
3943 OSPF_ISM_WRITE_ON(oi
->ospf
);
3945 /* Add Link State Request Retransmission Timer. */
3946 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3949 /* Send Link State Update with an LSA. */
3950 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3953 struct list
*update
;
3955 update
= list_new();
3957 listnode_add(update
, lsa
);
3959 /*ospf instance is going down, send self originated
3960 * MAXAGE LSA update to neighbors to remove from LSDB */
3961 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3962 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3964 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3966 list_delete(&update
);
3969 /* Determine size for packet. Must be at least big enough to accomodate next
3970 * LSA on list, which may be bigger than MTU size.
3972 * Return pointer to new ospf_packet
3973 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3974 * on packet sizes (in which case offending LSA is deleted from update list)
3976 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3977 struct ospf_interface
*oi
)
3979 struct ospf_lsa
*lsa
;
3980 struct listnode
*ln
;
3982 static char warned
= 0;
3984 lsa
= listgetdata((ln
= listhead(update
)));
3987 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3988 > ospf_packet_max(oi
)) {
3992 "ospf_ls_upd_packet_new: oversized LSA encountered!will need to fragment. Not optimal. Try divide up your network with areas. Use 'debug ospf packet send' to see details, or look at 'show ip ospf database ..'");
3996 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3998 "ospf_ls_upd_packet_new: oversized LSA id:%pI4, %d bytes originated by %pI4, will be fragmented!",
4000 ntohs(lsa
->data
->length
),
4001 &lsa
->data
->adv_router
);
4004 * Allocate just enough to fit this LSA only, to avoid including
4006 * LSAs in fragmented LSA Updates.
4008 size
= ntohs(lsa
->data
->length
)
4009 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
4010 + OSPF_LS_UPD_MIN_SIZE
;
4012 size
= oi
->ifp
->mtu
;
4014 if (size
> OSPF_MAX_PACKET_SIZE
) {
4015 flog_warn(EC_OSPF_LARGE_LSA
,
4016 "ospf_ls_upd_packet_new: oversized LSA id:%pI4 too big, %d bytes, packet size %ld, dropping it completely. OSPF routing is broken!",
4017 &lsa
->data
->id
, ntohs(lsa
->data
->length
),
4019 list_delete_node(update
, ln
);
4023 /* IP header is built up separately by ospf_write(). This means, that we
4025 * reduce the "affordable" size just calculated by length of an IP
4027 * This makes sure, that even if we manage to fill the payload with LSA
4029 * completely, the final packet (our data plus IP header) still fits
4031 * outgoing interface MTU. This correction isn't really meaningful for
4033 * oversized LSA, but for consistency the correction is done for both
4036 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
4038 return ospf_packet_new(size
- sizeof(struct ip
));
4041 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
4042 struct list
*update
, struct in_addr addr
,
4045 struct ospf_packet
*op
;
4046 uint16_t length
= OSPF_HEADER_SIZE
;
4048 if (IS_DEBUG_OSPF_EVENT
)
4049 zlog_debug("listcount = %d, [%s]dst %pI4", listcount(update
),
4050 IF_NAME(oi
), &addr
);
4052 /* Check that we have really something to process */
4053 if (listcount(update
) == 0)
4056 op
= ospf_ls_upd_packet_new(update
, oi
);
4058 /* Prepare OSPF common header. */
4059 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4061 /* Prepare OSPF Link State Update body.
4062 * Includes Type-7 translation.
4064 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4066 /* Fill OSPF header. */
4067 ospf_fill_header(oi
, op
->s
, length
);
4069 /* Set packet length. */
4070 op
->length
= length
;
4072 /* Decide destination address. */
4073 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4074 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4076 op
->dst
.s_addr
= addr
.s_addr
;
4078 /* Add packet to the interface output queue. */
4079 ospf_packet_add(oi
, op
);
4080 /* Call ospf_write() right away to send ospf packets to neighbors */
4081 if (send_lsupd_now
) {
4082 struct thread os_packet_thd
;
4084 os_packet_thd
.arg
= (void *)oi
->ospf
;
4085 if (oi
->on_write_q
== 0) {
4086 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4089 ospf_write(&os_packet_thd
);
4091 * We are fake calling ospf_write with a fake
4092 * thread. Imagine that we have oi_a already
4093 * enqueued and we have turned on the write
4095 * Now this function calls this for oi_b
4096 * so the on_write_q has oi_a and oi_b on
4097 * it, ospf_write runs and clears the packets
4098 * for both oi_a and oi_b. Removing them from
4099 * the on_write_q. After this thread of execution
4100 * finishes we will execute the t_write thread
4101 * with nothing in the on_write_q causing an
4102 * assert. So just make sure that the t_write
4103 * is actually turned off.
4105 if (list_isempty(oi
->ospf
->oi_write_q
))
4106 OSPF_TIMER_OFF(oi
->ospf
->t_write
);
4108 /* Hook thread to write packet. */
4109 OSPF_ISM_WRITE_ON(oi
->ospf
);
4113 static void ospf_ls_upd_send_queue_event(struct thread
*thread
)
4115 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4116 struct route_node
*rn
;
4117 struct route_node
*rnext
;
4118 struct list
*update
;
4121 oi
->t_ls_upd_event
= NULL
;
4123 if (IS_DEBUG_OSPF_EVENT
)
4124 zlog_debug("ospf_ls_upd_send_queue start");
4126 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4127 rnext
= route_next(rn
);
4129 if (rn
->info
== NULL
)
4132 update
= (struct list
*)rn
->info
;
4134 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4136 /* list might not be empty. */
4137 if (listcount(update
) == 0) {
4138 list_delete((struct list
**)&rn
->info
);
4139 route_unlock_node(rn
);
4145 if (IS_DEBUG_OSPF_EVENT
)
4147 "ospf_ls_upd_send_queue: update lists not cleared, %d nodes to try again, raising new event",
4149 oi
->t_ls_upd_event
= NULL
;
4150 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4151 &oi
->t_ls_upd_event
);
4154 if (IS_DEBUG_OSPF_EVENT
)
4155 zlog_debug("ospf_ls_upd_send_queue stop");
4158 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4161 struct ospf_interface
*oi
;
4162 struct ospf_lsa
*lsa
;
4163 struct prefix_ipv4 p
;
4164 struct route_node
*rn
;
4165 struct listnode
*node
;
4170 p
.prefixlen
= IPV4_MAX_BITLEN
;
4172 /* Decide destination address. */
4173 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4174 p
.prefix
= oi
->vl_data
->peer_addr
;
4175 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4176 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4177 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4178 p
.prefix
= nbr
->address
.u
.prefix4
;
4179 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4180 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4181 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4182 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4184 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4186 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4187 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4190 "* LS-Update is directly sent on NBMA network.");
4191 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4192 flog_warn(EC_OSPF_PACKET
,
4193 "* LS-Update is sent to myself.");
4196 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4198 if (rn
->info
== NULL
)
4199 rn
->info
= list_new();
4201 route_unlock_node(rn
);
4203 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4204 listnode_add(rn
->info
,
4205 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4206 if (send_lsupd_now
) {
4207 struct list
*send_update_list
;
4208 struct route_node
*rnext
;
4210 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4211 rnext
= route_next(rn
);
4213 if (rn
->info
== NULL
)
4216 send_update_list
= (struct list
*)rn
->info
;
4218 ospf_ls_upd_queue_send(oi
, send_update_list
,
4219 rn
->p
.u
.prefix4
, 1);
4222 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4223 &oi
->t_ls_upd_event
);
4226 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4229 struct ospf_packet
*op
;
4230 uint16_t length
= OSPF_HEADER_SIZE
;
4232 op
= ospf_packet_new(oi
->ifp
->mtu
);
4234 /* Prepare OSPF common header. */
4235 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4237 /* Prepare OSPF Link State Acknowledgment body. */
4238 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4240 /* Fill OSPF header. */
4241 ospf_fill_header(oi
, op
->s
, length
);
4243 /* Set packet length. */
4244 op
->length
= length
;
4246 /* Decide destination address. */
4247 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4248 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4250 op
->dst
.s_addr
= dst
.s_addr
;
4252 /* Add packet to the interface output queue. */
4253 ospf_packet_add(oi
, op
);
4255 /* Hook thread to write packet. */
4256 OSPF_ISM_WRITE_ON(oi
->ospf
);
4259 static void ospf_ls_ack_send_event(struct thread
*thread
)
4261 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4263 oi
->t_ls_ack_direct
= NULL
;
4265 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4266 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4267 oi
->ls_ack_direct
.dst
);
4270 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4272 struct ospf_interface
*oi
= nbr
->oi
;
4274 if (IS_GRACE_LSA(lsa
)) {
4275 if (IS_DEBUG_OSPF_GR
)
4276 zlog_debug("%s, Sending GRACE ACK to Restarter.",
4280 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4281 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4283 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4285 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4286 &oi
->t_ls_ack_direct
);
4289 /* Send Link State Acknowledgment delayed. */
4290 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4294 /* Decide destination address. */
4295 /* RFC2328 Section 13.5 On non-broadcast
4296 networks, delayed Link State Acknowledgment packets must be
4297 unicast separately over each adjacency (i.e., neighbor whose
4298 state is >= Exchange). */
4299 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4300 struct ospf_neighbor
*nbr
;
4301 struct route_node
*rn
;
4303 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4304 if ((nbr
= rn
->info
) != NULL
)
4305 if (nbr
!= oi
->nbr_self
4306 && nbr
->state
>= NSM_Exchange
)
4307 while (listcount(oi
->ls_ack
))
4308 ospf_ls_ack_send_list(
4310 nbr
->address
.u
.prefix4
);
4313 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4314 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4315 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4316 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4317 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4318 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4319 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4320 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4322 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4324 while (listcount(oi
->ls_ack
))
4325 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4329 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4330 * address. As a result, the kernel does not need to learn the interface
4331 * MAC of the OSPF neighbor. However, in our world, this will delay
4332 * convergence. Take the case when due to a link flap, all routes now
4333 * want to use an interface which was deemed to be costlier prior to this
4334 * event. For routes that will be installed, the missing MAC will have
4335 * punt-to-CPU set on them. This may overload the CPU control path that
4336 * can be avoided if the MAC was known apriori.
4338 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4340 if (!nbr
|| !nbr
->oi
->ospf
->proactive_arp
)
4343 ospf_zebra_send_arp(nbr
->oi
->ifp
, &nbr
->address
);