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_OFF(nbr
->t_ls_req
);
470 thread_add_event(master
, ospf_ls_req_timer
, nbr
, 0, &nbr
->t_ls_req
);
473 /* Cyclic timer function. Fist registered in ospf_nbr_new () in
475 void ospf_ls_upd_timer(struct thread
*thread
)
477 struct ospf_neighbor
*nbr
;
479 nbr
= THREAD_ARG(thread
);
480 nbr
->t_ls_upd
= NULL
;
482 /* Send Link State Update. */
483 if (ospf_ls_retransmit_count(nbr
) > 0) {
485 struct ospf_lsdb
*lsdb
;
487 int retransmit_interval
;
489 retransmit_interval
=
490 OSPF_IF_PARAM(nbr
->oi
, retransmit_interval
);
492 lsdb
= &nbr
->ls_rxmt
;
495 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
496 struct route_table
*table
= lsdb
->type
[i
].db
;
497 struct route_node
*rn
;
499 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
500 struct ospf_lsa
*lsa
;
502 if ((lsa
= rn
->info
) != NULL
) {
503 /* Don't retransmit an LSA if we
505 the last RxmtInterval seconds - this
507 neighbour a chance to acknowledge the
509 have ben just received before the
511 fired. This is a small tweak to what
513 but it will cut out out a lot of
516 if (monotime_since(&lsa
->tv_recv
, NULL
)
517 >= retransmit_interval
* 1000000LL)
518 listnode_add(update
, rn
->info
);
523 if (listcount(update
) > 0)
524 ospf_ls_upd_send(nbr
, update
, OSPF_SEND_PACKET_DIRECT
,
526 list_delete(&update
);
529 /* Set LS Update retransmission timer. */
530 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
, nbr
->v_ls_upd
);
533 void ospf_ls_ack_timer(struct thread
*thread
)
535 struct ospf_interface
*oi
;
537 oi
= THREAD_ARG(thread
);
540 /* Send Link State Acknowledgment. */
541 if (listcount(oi
->ls_ack
) > 0)
542 ospf_ls_ack_send_delayed(oi
);
544 /* Set LS Ack timer. */
545 OSPF_ISM_TIMER_ON(oi
->t_ls_ack
, ospf_ls_ack_timer
, oi
->v_ls_ack
);
548 #ifdef WANT_OSPF_WRITE_FRAGMENT
549 static void ospf_write_frags(int fd
, struct ospf_packet
*op
, struct ip
*iph
,
550 struct msghdr
*msg
, unsigned int maxdatasize
,
551 unsigned int mtu
, int flags
, uint8_t type
)
553 #define OSPF_WRITE_FRAG_SHIFT 3
558 assert(op
->length
== stream_get_endp(op
->s
));
559 assert(msg
->msg_iovlen
== 2);
563 * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
564 * well as the IP_MF flag, making this all quite pointless.
566 * However, for a system on which IP_MF is left alone, and ip_id left
567 * alone or else which sets same ip_id for each fragment this might
570 * XXX-TODO: It would be much nicer to have the kernel's use their
571 * existing fragmentation support to do this for us. Bugs/RFEs need to
572 * be raised against the various kernels.
576 iph
->ip_off
|= IP_MF
;
578 /* ip frag offset is expressed in units of 8byte words */
579 offset
= maxdatasize
>> OSPF_WRITE_FRAG_SHIFT
;
581 iovp
= &msg
->msg_iov
[1];
583 while ((stream_get_endp(op
->s
) - stream_get_getp(op
->s
))
585 /* data length of this frag is to next offset value */
586 iovp
->iov_len
= offset
<< OSPF_WRITE_FRAG_SHIFT
;
587 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
588 assert(iph
->ip_len
<= mtu
);
590 sockopt_iphdrincl_swab_htosys(iph
);
592 ret
= sendmsg(fd
, msg
, flags
);
594 sockopt_iphdrincl_swab_systoh(iph
);
599 "*** 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_packet
*op
;
627 struct sockaddr_in sa_dst
;
634 struct listnode
*node
;
635 #ifdef WANT_OSPF_WRITE_FRAGMENT
636 static uint16_t ipid
= 0;
637 uint16_t maxdatasize
;
638 #endif /* WANT_OSPF_WRITE_FRAGMENT */
639 #define OSPF_WRITE_IPHL_SHIFT 2
643 unsigned char cmsgbuf
[64] = {};
644 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
645 struct in_pktinfo
*pi
;
648 if (ospf
->fd
< 0 || ospf
->oi_running
== 0) {
649 if (IS_DEBUG_OSPF_EVENT
)
651 "ospf_write failed to send, fd %d, instance %u",
652 ospf
->fd
, ospf
->oi_running
);
656 node
= listhead(ospf
->oi_write_q
);
658 oi
= listgetdata(node
);
660 #ifdef WANT_OSPF_WRITE_FRAGMENT
661 /* seed ipid static with low order bits of time */
663 ipid
= (time(NULL
) & 0xffff);
664 #endif /* WANT_OSPF_WRITE_FRAGMENT */
666 while ((pkt_count
< ospf
->write_oi_count
) && oi
) {
668 #ifdef WANT_OSPF_WRITE_FRAGMENT
669 /* convenience - max OSPF data per packet */
670 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
671 #endif /* WANT_OSPF_WRITE_FRAGMENT */
672 /* Get one packet from queue. */
673 op
= ospf_fifo_head(oi
->obuf
);
675 assert(op
->length
>= OSPF_HEADER_SIZE
);
677 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
678 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
679 ospf_if_ipmulticast(ospf
, oi
->address
,
682 /* Rewrite the md5 signature & update the seq */
683 ospf_make_md5_digest(oi
, op
);
685 /* Retrieve OSPF packet type. */
686 stream_set_getp(op
->s
, 1);
687 type
= stream_getc(op
->s
);
689 /* reset get pointer */
690 stream_set_getp(op
->s
, 0);
692 memset(&iph
, 0, sizeof(iph
));
693 memset(&sa_dst
, 0, sizeof(sa_dst
));
695 sa_dst
.sin_family
= AF_INET
;
696 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
697 sa_dst
.sin_len
= sizeof(sa_dst
);
698 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
699 sa_dst
.sin_addr
= op
->dst
;
700 sa_dst
.sin_port
= htons(0);
702 /* Set DONTROUTE flag if dst is unicast. */
703 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
704 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
705 flags
= MSG_DONTROUTE
;
707 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
708 /* it'd be very strange for header to not be 4byte-word aligned
710 if (sizeof(struct ip
)
711 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
712 iph
.ip_hl
++; /* we presume sizeof(struct ip) cant
715 iph
.ip_v
= IPVERSION
;
716 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
717 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
719 #if defined(__DragonFly__)
721 * DragonFly's raw socket expects ip_len/ip_off in network byte
724 iph
.ip_len
= htons(iph
.ip_len
);
727 #ifdef WANT_OSPF_WRITE_FRAGMENT
728 /* XXX-MT: not thread-safe at all..
729 * XXX: this presumes this is only programme sending OSPF
731 * otherwise, no guarantee ipid will be unique
734 #endif /* WANT_OSPF_WRITE_FRAGMENT */
737 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
738 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
740 iph
.ip_ttl
= OSPF_IP_TTL
;
741 iph
.ip_p
= IPPROTO_OSPFIGP
;
743 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
744 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
746 memset(&msg
, 0, sizeof(msg
));
747 msg
.msg_name
= (caddr_t
)&sa_dst
;
748 msg
.msg_namelen
= sizeof(sa_dst
);
752 iov
[0].iov_base
= (char *)&iph
;
753 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
754 iov
[1].iov_base
= stream_pnt(op
->s
);
755 iov
[1].iov_len
= op
->length
;
758 msg
.msg_control
= (caddr_t
)cm
;
759 cm
->cmsg_level
= SOL_IP
;
760 cm
->cmsg_type
= IP_PKTINFO
;
761 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
762 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
763 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
765 msg
.msg_controllen
= cm
->cmsg_len
;
768 /* Sadly we can not rely on kernels to fragment packets
769 * because of either IP_HDRINCL and/or multicast
770 * destination being set.
773 #ifdef WANT_OSPF_WRITE_FRAGMENT
774 if (op
->length
> maxdatasize
)
775 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
776 oi
->ifp
->mtu
, flags
, type
);
777 #endif /* WANT_OSPF_WRITE_FRAGMENT */
779 /* send final fragment (could be first) */
780 sockopt_iphdrincl_swab_htosys(&iph
);
781 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
782 sockopt_iphdrincl_swab_systoh(&iph
);
783 if (IS_DEBUG_OSPF_EVENT
)
785 "ospf_write to %pI4, id %d, off %d, len %d, interface %s, mtu %u:",
786 &iph
.ip_dst
, iph
.ip_id
, iph
.ip_off
,
787 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
789 /* sendmsg will return EPERM if firewall is blocking sending.
790 * This is a normal situation when 'ip nhrp map multicast xxx'
791 * is being used to send multicast packets to DMVPN peers. In
792 * that case the original message is blocked with iptables rule
793 * causing the EPERM result
795 if (ret
< 0 && errno
!= EPERM
)
798 "*** sendmsg in ospf_write failed to %pI4, id %d, off %d, len %d, interface %s, mtu %u: %s",
799 &iph
.ip_dst
, iph
.ip_id
, iph
.ip_off
,
800 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
801 safe_strerror(errno
));
803 /* Show debug sending packet. */
804 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
805 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
807 "-----------------------------------------------------");
808 stream_set_getp(op
->s
, 0);
809 ospf_packet_dump(op
->s
);
812 zlog_debug("%s sent to [%pI4] via [%s].",
813 lookup_msg(ospf_packet_type_str
, type
, NULL
),
814 &op
->dst
, IF_NAME(oi
));
816 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
818 "-----------------------------------------------------");
825 case OSPF_MSG_DB_DESC
:
828 case OSPF_MSG_LS_REQ
:
831 case OSPF_MSG_LS_UPD
:
834 case OSPF_MSG_LS_ACK
:
841 /* Now delete packet from queue. */
842 ospf_packet_delete(oi
);
844 /* Move this interface to the tail of write_q to
845 serve everyone in a round robin fashion */
846 list_delete_node(ospf
->oi_write_q
, node
);
847 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
851 listnode_add(ospf
->oi_write_q
, oi
);
853 /* Setup to service from the head of the queue again */
854 if (!list_isempty(ospf
->oi_write_q
)) {
855 node
= listhead(ospf
->oi_write_q
);
856 oi
= listgetdata(node
);
860 /* If packets still remain in queue, call write thread. */
861 if (!list_isempty(ospf
->oi_write_q
))
862 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
866 /* OSPF Hello message read -- RFC2328 Section 10.5. */
867 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
868 struct stream
*s
, struct ospf_interface
*oi
, int size
)
870 struct ospf_hello
*hello
;
871 struct ospf_neighbor
*nbr
;
875 /* increment statistics. */
878 hello
= (struct ospf_hello
*)stream_pnt(s
);
880 /* If Hello is myself, silently discard. */
881 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
882 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
884 "ospf_header[%s/%pI4]: selforiginated, dropping.",
885 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
892 /* get neighbor prefix. */
894 p
.prefixlen
= ip_masklen(hello
->network_mask
);
895 p
.u
.prefix4
= iph
->ip_src
;
897 /* Compare network mask. */
898 /* Checking is ignored for Point-to-Point and Virtual link. */
899 /* Checking is also ignored for Point-to-Multipoint with /32 prefix */
900 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
901 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
902 && !(oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
903 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
))
904 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
907 "Packet %pI4 [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
908 &ospfh
->router_id
, IF_NAME(oi
),
909 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
913 /* Compare Router Dead Interval. */
914 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
915 flog_warn(EC_OSPF_PACKET
,
916 "Packet %pI4 [Hello:RECV]: RouterDeadInterval mismatch (expected %u, but received %u).",
918 OSPF_IF_PARAM(oi
, v_wait
),
919 ntohl(hello
->dead_interval
));
923 /* Compare Hello Interval - ignored if fast-hellos are set. */
924 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
925 if (OSPF_IF_PARAM(oi
, v_hello
)
926 != ntohs(hello
->hello_interval
)) {
929 "Packet %pI4 [Hello:RECV]: HelloInterval mismatch (expected %u, but received %u).",
931 OSPF_IF_PARAM(oi
, v_hello
),
932 ntohs(hello
->hello_interval
));
937 if (IS_DEBUG_OSPF_EVENT
)
938 zlog_debug("Packet %pI4 [Hello:RECV]: Options %s vrf %s",
940 ospf_options_dump(hello
->options
),
941 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
943 /* Compare options. */
944 #define REJECT_IF_TBIT_ON 1 /* XXX */
945 #ifdef REJECT_IF_TBIT_ON
946 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
948 * This router does not support non-zero TOS.
949 * Drop this Hello packet not to establish neighbor
952 flog_warn(EC_OSPF_PACKET
,
953 "Packet %pI4 [Hello:RECV]: T-bit on, drop it.",
957 #endif /* REJECT_IF_TBIT_ON */
959 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
960 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
962 * This router does know the correct usage of O-bit
963 * the bit should be set in DD packet only.
965 flog_warn(EC_OSPF_PACKET
,
966 "Packet %pI4 [Hello:RECV]: O-bit abuse?",
968 #ifdef STRICT_OBIT_USAGE_CHECK
969 return; /* Reject this packet. */
970 #else /* STRICT_OBIT_USAGE_CHECK */
971 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
972 #endif /* STRICT_OBIT_USAGE_CHECK */
975 /* new for NSSA is to ensure that NP is on and E is off */
977 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
978 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
979 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
980 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
981 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
984 "NSSA-Packet-%pI4[Hello:RECV]: my options: %x, his options %x",
985 &ospfh
->router_id
, OPTIONS(oi
),
989 if (IS_DEBUG_OSPF_NSSA
)
990 zlog_debug("NSSA-Hello:RECV:Packet from %pI4:",
993 /* The setting of the E-bit found in the Hello Packet's Options
994 field must match this area's ExternalRoutingCapability A
995 mismatch causes processing to stop and the packet to be
996 dropped. The setting of the rest of the bits in the Hello
997 Packet's Options field should be ignored. */
998 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
999 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1002 "Packet %pI4 [Hello:RECV]: my options: %x, his options %x",
1003 &ospfh
->router_id
, OPTIONS(oi
),
1008 /* get neighbour struct */
1009 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1011 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1014 old_state
= nbr
->state
;
1016 /* Add event to thread. */
1017 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_HelloReceived
);
1019 /* RFC2328 Section 9.5.1
1020 If the router is not eligible to become Designated Router,
1021 (snip) It must also send an Hello Packet in reply to an
1022 Hello Packet received from any eligible neighbor (other than
1023 the current Designated Router and Backup Designated Router). */
1024 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1025 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1026 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1027 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1028 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1029 ospf_hello_reply_timer
,
1030 OSPF_HELLO_REPLY_DELAY
);
1032 /* on NBMA network type, it happens to receive bidirectional Hello
1034 without advance 1-Way Received event.
1035 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1036 if (oi
->type
== OSPF_IFTYPE_NBMA
1037 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1038 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1039 nbr
->priority
= hello
->priority
;
1040 nbr
->d_router
= hello
->d_router
;
1041 nbr
->bd_router
= hello
->bd_router
;
1045 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1046 size
- OSPF_HELLO_MIN_SIZE
)) {
1047 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1048 nbr
->options
|= hello
->options
;
1050 /* If the router is DR_OTHER, RESTARTER will not wait
1051 * until it receives the hello from it if it receives
1053 * So, helper might receives ONW_WAY hello from
1054 * RESTARTER. So not allowing to change the state if it
1055 * receives one_way hellow when it acts as HELPER for
1056 * that specific neighbor.
1058 if (!OSPF_GR_IS_ACTIVE_HELPER(nbr
))
1059 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1060 /* Set neighbor information. */
1061 nbr
->priority
= hello
->priority
;
1062 nbr
->d_router
= hello
->d_router
;
1063 nbr
->bd_router
= hello
->bd_router
;
1067 if (OSPF_GR_IS_ACTIVE_HELPER(nbr
)) {
1068 /* As per the GR Conformance Test Case 7.2. Section 3
1069 * "Also, if X was the Designated Router on network segment S
1070 * when the helping relationship began, Y maintains X as the
1071 * Designated Router until the helping relationship is
1073 * When I am helper for this neighbor, I should not trigger the
1074 * ISM Events. Also Intentionally not setting the priority and
1075 * other fields so that when the neighbor exits the Grace
1076 * period, it can handle if there is any change before GR and
1078 if (IS_DEBUG_OSPF_GR
)
1080 "%s, Neighbor is under GR Restart, hence ignoring the ISM Events",
1081 __PRETTY_FUNCTION__
);
1083 /* If neighbor itself declares DR and no BDR exists,
1084 cause event BackupSeen */
1085 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1086 if (hello
->bd_router
.s_addr
== INADDR_ANY
1087 && oi
->state
== ISM_Waiting
)
1088 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1090 /* neighbor itself declares BDR. */
1091 if (oi
->state
== ISM_Waiting
1092 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1094 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1096 /* had not previously. */
1097 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1098 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1099 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1100 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1102 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1104 /* had not previously. */
1105 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1106 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1107 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
,
1109 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
,
1111 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1113 /* Neighbor priority check. */
1114 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1115 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1118 /* Set neighbor information. */
1119 nbr
->priority
= hello
->priority
;
1120 nbr
->d_router
= hello
->d_router
;
1121 nbr
->bd_router
= hello
->bd_router
;
1124 * RFC 3623 - Section 2:
1125 * "If the restarting router determines that it was the Designated
1126 * Router on a given segment prior to the restart, it elects
1127 * itself as the Designated Router again. The restarting router
1128 * knows that it was the Designated Router if, while the
1129 * associated interface is in Waiting state, a Hello packet is
1130 * received from a neighbor listing the router as the Designated
1133 if (oi
->area
->ospf
->gr_info
.restart_in_progress
1134 && oi
->state
== ISM_Waiting
1135 && IPV4_ADDR_SAME(&hello
->d_router
, &oi
->address
->u
.prefix4
))
1136 DR(oi
) = hello
->d_router
;
1139 /* Save DD flags/options/Seqnum received. */
1140 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1141 struct ospf_db_desc
*dd
)
1143 nbr
->last_recv
.flags
= dd
->flags
;
1144 nbr
->last_recv
.options
= dd
->options
;
1145 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1148 /* Process rest of DD packet. */
1149 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1150 struct ospf_neighbor
*nbr
,
1151 struct ospf_db_desc
*dd
, uint16_t size
)
1153 struct ospf_lsa
*new, *find
;
1154 struct lsa_header
*lsah
;
1156 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1157 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1158 size
-= OSPF_LSA_HEADER_SIZE
) {
1159 lsah
= (struct lsa_header
*)stream_pnt(s
);
1160 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1162 /* Unknown LS type. */
1163 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1164 flog_warn(EC_OSPF_PACKET
,
1165 "Packet [DD:RECV]: Unknown LS type %d.",
1167 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1171 if (IS_OPAQUE_LSA(lsah
->type
)
1172 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1173 flog_warn(EC_OSPF_PACKET
,
1174 "LSA[Type%d:%pI4]: Opaque capability mismatch?",
1175 lsah
->type
, &lsah
->id
);
1176 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1180 switch (lsah
->type
) {
1181 case OSPF_AS_EXTERNAL_LSA
:
1182 case OSPF_OPAQUE_AS_LSA
:
1183 /* Check for stub area. Reject if AS-External from stub
1185 allow if from NSSA. */
1186 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1189 "Packet [DD:RECV]: LSA[Type%d:%pI4] from %s area.",
1190 lsah
->type
, &lsah
->id
,
1191 (oi
->area
->external_routing
1195 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1196 NSM_SeqNumberMismatch
);
1204 /* Create LS-request object. */
1205 new = ospf_ls_request_new(lsah
);
1207 /* Lookup received LSA, then add LS request list. */
1208 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1210 /* ospf_lsa_more_recent is fine with NULL pointers */
1211 switch (ospf_lsa_more_recent(find
, new)) {
1213 /* Neighbour has a more recent LSA, we must request it
1215 ospf_ls_request_add(nbr
, new);
1218 /* If we have a copy of this LSA, it's either less
1220 * and we're requesting it from neighbour (the case
1222 * it's as recent and we both have same copy (this
1225 * In neither of these two cases is there any point in
1226 * describing our copy of the LSA to the neighbour in a
1227 * DB-Summary packet, if we're still intending to do so.
1229 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1230 * backward compatible optimisation to OSPF DB Exchange
1232 * DB Description process implemented here.
1235 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1236 ospf_lsa_discard(new);
1239 /* We have the more recent copy, nothing specific to do:
1240 * - no need to request neighbours stale copy
1241 * - must leave DB summary list copy alone
1243 if (IS_DEBUG_OSPF_EVENT
)
1245 "Packet [DD:RECV]: LSA received Type %d, ID %pI4 is not recent.",
1246 lsah
->type
, &lsah
->id
);
1247 ospf_lsa_discard(new);
1252 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1255 /* Both sides have no More, then we're done with Exchange */
1256 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1257 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1259 ospf_db_desc_send(nbr
);
1263 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1265 /* Send DD packet in reply.
1267 * Must be done to acknowledge the Master's DD, regardless of
1268 * whether we have more LSAs ourselves to describe.
1270 * This function will clear the 'More' bit, if after this DD
1271 * we have no more LSAs to describe to the master..
1273 ospf_db_desc_send(nbr
);
1275 /* Slave can raise ExchangeDone now, if master is also done */
1276 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1277 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1280 /* Save received neighbor values from DD. */
1281 ospf_db_desc_save_current(nbr
, dd
);
1284 ospf_ls_req_send(nbr
);
1287 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1288 struct ospf_neighbor
*nbr
)
1290 /* Is DD duplicated? */
1291 if (dd
->options
== nbr
->last_recv
.options
1292 && dd
->flags
== nbr
->last_recv
.flags
1293 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1299 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1300 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1301 struct stream
*s
, struct ospf_interface
*oi
,
1304 struct ospf_db_desc
*dd
;
1305 struct ospf_neighbor
*nbr
;
1307 /* Increment statistics. */
1310 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1312 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1314 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %pI4",
1320 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1321 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1324 "Packet[DD]: Neighbor %pI4 MTU %u is larger than [%s]'s MTU %u",
1325 &nbr
->router_id
, ntohs(dd
->mtu
), IF_NAME(oi
),
1331 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1333 * required. In fact at least JunOS sends DD packets with P bit clear.
1334 * Until proper solution is developped, this hack should help.
1336 * Update: According to the RFCs, N bit is specified /only/ for Hello
1337 * options, unfortunately its use in DD options is not specified. Hence
1339 * implementations follow E-bit semantics and set it in DD options, and
1341 * treat it as unspecified and hence follow the directive "default for
1342 * options is clear", ie unset.
1344 * Reset the flag, as ospfd follows E-bit semantics.
1346 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1347 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1348 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1349 if (IS_DEBUG_OSPF_EVENT
)
1351 "Packet[DD]: Neighbour %pI4: Has NSSA capability, sends with N bit clear in DD options",
1353 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1356 #ifdef REJECT_IF_TBIT_ON
1357 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1359 * In Hello protocol, optional capability must have checked
1360 * to prevent this T-bit enabled router be my neighbor.
1362 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %pI4: T-bit on?",
1366 #endif /* REJECT_IF_TBIT_ON */
1368 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1369 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1371 * This node is not configured to handle O-bit, for now.
1372 * Clear it to ignore unsupported capability proposed by
1375 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1378 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1380 "%s:Packet[DD]: Neighbor %pI4 state is %s, seq_num:0x%x, local:0x%x",
1381 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
1382 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
),
1383 ntohl(dd
->dd_seqnum
), nbr
->dd_seqnum
);
1385 /* Process DD packet by neighbor status. */
1386 switch (nbr
->state
) {
1390 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
1392 "Packet[DD]: Neighbor %pI4 state is %s, packet discarded.",
1394 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1398 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1399 /* If the new state is ExStart, the processing of the current
1400 packet should then continue in this new state by falling
1401 through to case ExStart below. */
1402 if (nbr
->state
!= NSM_ExStart
)
1407 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1408 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1409 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1411 /* We're Slave---obey */
1412 if (CHECK_FLAG(oi
->ospf
->config
,
1413 OSPF_LOG_ADJACENCY_DETAIL
))
1415 "Packet[DD]: Neighbor %pI4 Negotiation done (Slave).",
1418 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1421 UNSET_FLAG(nbr
->dd_flags
,
1422 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1424 /* We're Master, ignore the initial DBD from
1426 if (CHECK_FLAG(oi
->ospf
->config
,
1427 OSPF_LOG_ADJACENCY_DETAIL
))
1429 "Packet[DD]: Neighbor %pI4: Initial DBD from Slave, ignoring.",
1434 /* Ack from the Slave */
1435 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1436 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1437 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1440 "Packet[DD]: Neighbor %pI4 Negotiation done (Master).",
1442 /* Reset I, leaving MS */
1443 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1445 flog_warn(EC_OSPF_PACKET
,
1446 "Packet[DD]: Neighbor %pI4 Negotiation fails.",
1451 /* This is where the real Options are saved */
1452 nbr
->options
= dd
->options
;
1454 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1455 if (IS_DEBUG_OSPF_EVENT
)
1457 "Neighbor[%pI4] is %sOpaque-capable.",
1459 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1463 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1464 && IPV4_ADDR_SAME(&DR(oi
),
1465 &nbr
->address
.u
.prefix4
)) {
1468 "DR-neighbor[%pI4] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1470 /* This situation is undesirable, but not a real
1475 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1477 /* continue processing rest of packet. */
1478 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1481 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1482 if (IS_SET_DD_MS(nbr
->dd_flags
))
1483 /* Master: discard duplicated DD packet. */
1485 "Packet[DD] (Master): Neighbor %pI4 packet duplicated.",
1488 /* Slave: cause to retransmit the last Database
1492 "Packet[DD] [Slave]: Neighbor %pI4 packet duplicated.",
1494 ospf_db_desc_resend(nbr
);
1499 /* Otherwise DD packet should be checked. */
1500 /* Check Master/Slave bit mismatch */
1501 if (IS_SET_DD_MS(dd
->flags
)
1502 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1503 flog_warn(EC_OSPF_PACKET
,
1504 "Packet[DD]: Neighbor %pI4 MS-bit mismatch.",
1506 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1507 if (IS_DEBUG_OSPF_EVENT
)
1509 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1510 dd
->flags
, nbr
->dd_flags
);
1514 /* Check initialize bit is set. */
1515 if (IS_SET_DD_I(dd
->flags
)) {
1516 zlog_info("Packet[DD]: Neighbor %pI4 I-bit set.",
1518 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1522 /* Check DD Options. */
1523 if (dd
->options
!= nbr
->options
) {
1524 flog_warn(EC_OSPF_PACKET
,
1525 "Packet[DD]: Neighbor %pI4 options mismatch.",
1527 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1531 /* Check DD sequence number. */
1532 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1533 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1534 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1535 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1538 "Packet[DD]: Neighbor %pI4 sequence number mismatch.",
1540 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1544 /* Continue processing rest of packet. */
1545 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1549 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1550 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1551 /* Master should discard duplicate DD packet. */
1553 "Packet[DD]: Neighbor %pI4 duplicated, packet discarded.",
1557 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1558 < nbr
->v_inactivity
* 1000000LL) {
1559 /* In states Loading and Full the slave
1561 its last Database Description packet
1563 duplicate Database Description
1565 from the master. For this reason the
1567 wait RouterDeadInterval seconds
1569 last Database Description packet.
1571 Database Description packet from the
1573 this interval will generate a
1575 neighbor event. RFC2328 Section 10.8
1577 ospf_db_desc_resend(nbr
);
1583 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1586 flog_warn(EC_OSPF_PACKET
,
1587 "Packet[DD]: Neighbor %pI4 NSM illegal status %u.",
1588 &nbr
->router_id
, nbr
->state
);
1593 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1595 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1596 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1597 struct stream
*s
, struct ospf_interface
*oi
,
1600 struct ospf_neighbor
*nbr
;
1602 struct in_addr ls_id
;
1603 struct in_addr adv_router
;
1604 struct ospf_lsa
*find
;
1605 struct list
*ls_upd
;
1606 unsigned int length
;
1608 /* Increment statistics. */
1611 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1613 flog_warn(EC_OSPF_PACKET
,
1614 "Link State Request: Unknown Neighbor %pI4",
1619 /* Neighbor State should be Exchange or later. */
1620 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1621 && nbr
->state
!= NSM_Full
) {
1624 "Link State Request received from %pI4: Neighbor state is %s, packet discarded.",
1626 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1630 /* Send Link State Update for ALL requested LSAs. */
1631 ls_upd
= list_new();
1632 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1634 while (size
>= OSPF_LSA_KEY_SIZE
) {
1635 /* Get one slice of Link State Request. */
1636 ls_type
= stream_getl(s
);
1637 ls_id
.s_addr
= stream_get_ipv4(s
);
1638 adv_router
.s_addr
= stream_get_ipv4(s
);
1640 /* Verify LSA type. */
1641 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1642 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1643 list_delete(&ls_upd
);
1647 /* Search proper LSA in LSDB. */
1648 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1651 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1652 list_delete(&ls_upd
);
1656 /* Packet overflows MTU size, send immediately. */
1657 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1658 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1659 ospf_ls_upd_send(nbr
, ls_upd
,
1660 OSPF_SEND_PACKET_DIRECT
, 0);
1662 ospf_ls_upd_send(nbr
, ls_upd
,
1663 OSPF_SEND_PACKET_INDIRECT
, 0);
1665 /* Only remove list contents. Keep ls_upd. */
1666 list_delete_all_node(ls_upd
);
1668 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1671 /* Append LSA to update list. */
1672 listnode_add(ls_upd
, find
);
1673 length
+= ntohs(find
->data
->length
);
1675 size
-= OSPF_LSA_KEY_SIZE
;
1678 /* Send rest of Link State Update. */
1679 if (listcount(ls_upd
) > 0) {
1680 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1681 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1684 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1687 list_delete(&ls_upd
);
1689 list_delete(&ls_upd
);
1692 /* Get the list of LSAs from Link State Update packet.
1693 And process some validation -- RFC2328 Section 13. (1)-(2). */
1694 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1696 struct ospf_interface
*oi
, size_t size
)
1698 uint16_t count
, sum
;
1700 struct lsa_header
*lsah
;
1701 struct ospf_lsa
*lsa
;
1706 count
= stream_getl(s
);
1707 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1709 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1710 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1711 lsah
= (struct lsa_header
*)stream_pnt(s
);
1712 length
= ntohs(lsah
->length
);
1714 if (length
> size
) {
1717 "Link State Update: LSA length exceeds packet size.");
1721 /* Validate the LSA's LS checksum. */
1722 sum
= lsah
->checksum
;
1723 if (!ospf_lsa_checksum_valid(lsah
)) {
1724 /* (bug #685) more details in a one-line message make it
1726 * to identify problem source on the one hand and to
1728 * chance to compress repeated messages in syslog on the
1732 "Link State Update: LSA checksum error %x/%x, ID=%pI4 from: nbr %pI4, router ID %pI4, adv router %pI4",
1733 sum
, lsah
->checksum
, &lsah
->id
,
1734 &nbr
->src
, &nbr
->router_id
,
1739 /* Examine the LSA's LS type. */
1740 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1741 flog_warn(EC_OSPF_PACKET
,
1742 "Link State Update: Unknown LS type %d",
1748 * What if the received LSA's age is greater than MaxAge?
1749 * Treat it as a MaxAge case -- endo.
1751 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1752 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1754 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1755 #ifdef STRICT_OBIT_USAGE_CHECK
1756 if ((IS_OPAQUE_LSA(lsah
->type
)
1757 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1758 || (!IS_OPAQUE_LSA(lsah
->type
)
1759 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1761 * This neighbor must know the exact usage of
1763 * the bit will be set in Type-9,10,11 LSAs
1766 flog_warn(EC_OSPF_PACKET
,
1767 "LSA[Type%d:%pI4]: O-bit abuse?",
1768 lsah
->type
, &lsah
->id
);
1771 #endif /* STRICT_OBIT_USAGE_CHECK */
1773 /* Do not take in AS External Opaque-LSAs if we are a
1775 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1776 && nbr
->oi
->area
->external_routing
1777 != OSPF_AREA_DEFAULT
) {
1778 if (IS_DEBUG_OSPF_EVENT
)
1780 "LSA[Type%d:%pI4]: We are a stub, don't take this LSA.",
1785 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1786 flog_warn(EC_OSPF_PACKET
,
1787 "LSA[Type%d:%pI4]: Opaque capability mismatch?",
1788 lsah
->type
, &lsah
->id
);
1792 /* Create OSPF LSA instance. */
1793 lsa
= ospf_lsa_new_and_data(length
);
1795 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1796 /* We may wish to put some error checking if type NSSA comes in
1797 and area not in NSSA mode */
1798 switch (lsah
->type
) {
1799 case OSPF_AS_EXTERNAL_LSA
:
1800 case OSPF_OPAQUE_AS_LSA
:
1803 case OSPF_OPAQUE_LINK_LSA
:
1804 lsa
->oi
= oi
; /* Remember incoming interface for
1805 flooding control. */
1808 lsa
->area
= oi
->area
;
1812 memcpy(lsa
->data
, lsah
, length
);
1814 if (IS_DEBUG_OSPF_EVENT
)
1816 "LSA[Type%d:%pI4]: %p new LSA created with Link State Update",
1817 lsa
->data
->type
, &lsa
->data
->id
,
1819 listnode_add(lsas
, lsa
);
1825 /* Cleanup Update list. */
1826 static void ospf_upd_list_clean(struct list
*lsas
)
1828 struct listnode
*node
, *nnode
;
1829 struct ospf_lsa
*lsa
;
1831 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1832 ospf_lsa_discard(lsa
);
1837 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1838 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1839 struct ospf_header
*ospfh
, struct stream
*s
,
1840 struct ospf_interface
*oi
, uint16_t size
)
1842 struct ospf_neighbor
*nbr
;
1844 struct listnode
*node
, *nnode
;
1845 struct ospf_lsa
*lsa
= NULL
;
1846 /* unsigned long ls_req_found = 0; */
1848 /* Dis-assemble the stream, update each entry, re-encapsulate for
1851 /* Increment statistics. */
1854 /* Check neighbor. */
1855 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1857 flog_warn(EC_OSPF_PACKET
,
1858 "Link State Update: Unknown Neighbor %pI4 on int: %s",
1859 &ospfh
->router_id
, IF_NAME(oi
));
1863 /* Check neighbor state. */
1864 if (nbr
->state
< NSM_Exchange
) {
1865 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1867 "Link State Update: Neighbor[%pI4] state %s is less than Exchange",
1869 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1874 /* Get list of LSAs from Link State Update packet. - Also performs
1875 * Stages 1 (validate LSA checksum) and 2 (check for LSA consistent
1876 * type) of section 13.
1878 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1882 #define DISCARD_LSA(L, N) \
1884 if (IS_DEBUG_OSPF_EVENT) \
1886 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1888 N, (void *)lsa, (int)lsa->data->type); \
1889 ospf_lsa_discard(L); \
1893 /* Process each LSA received in the one packet.
1895 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1896 * text below are from the steps in RFC 2328, Section 13.
1898 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1899 struct ospf_lsa
*ls_ret
, *current
;
1902 if (IS_DEBUG_OSPF(lsa
, LSA
))
1903 zlog_debug("LSA Type-%d from %pI4, ID: %pI4, ADV: %pI4",
1904 lsa
->data
->type
, &ospfh
->router_id
,
1905 &lsa
->data
->id
, &lsa
->data
->adv_router
);
1907 listnode_delete(lsas
,
1908 lsa
); /* We don't need it in list anymore */
1910 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1913 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1915 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1918 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1921 /* Do take in Type-7's if we are an NSSA */
1923 /* If we are also an ABR, later translate them to a Type-5
1926 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1927 translate them to a separate Type-5 packet. */
1929 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1930 /* Reject from STUB or NSSA */
1931 if (nbr
->oi
->area
->external_routing
1932 != OSPF_AREA_DEFAULT
) {
1933 if (IS_DEBUG_OSPF_NSSA
)
1935 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1936 DISCARD_LSA(lsa
, 1);
1939 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1940 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1941 if (IS_DEBUG_OSPF_NSSA
)
1943 "Incoming NSSA LSA Discarded: Not NSSA Area");
1944 DISCARD_LSA(lsa
, 2);
1947 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1948 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1949 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1950 &lsa
->data
->adv_router
)) {
1952 EC_OSPF_ROUTER_LSA_MISMATCH
,
1953 "Incoming Router-LSA from %pI4 with Adv-ID[%pI4] != LS-ID[%pI4]",
1954 &ospfh
->router_id
, &lsa
->data
->id
,
1955 &lsa
->data
->adv_router
);
1957 EC_OSPF_DOMAIN_CORRUPT
,
1958 "OSPF domain compromised by attack or corruption. Verify correct operation of -ALL- OSPF routers.");
1959 DISCARD_LSA(lsa
, 0);
1962 /* Find the LSA in the current database. */
1964 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1966 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1968 no instance of the LSA in the router's link state database,
1969 and none of router's neighbors are in states Exchange or
1971 then take the following actions: */
1973 if (IS_LSA_MAXAGE(lsa
) && !current
1974 && ospf_check_nbr_status(oi
->ospf
)) {
1975 /* (4a) Response Link State Acknowledgment. */
1976 ospf_ls_ack_send(nbr
, lsa
);
1978 /* (4b) Discard LSA. */
1979 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1981 "Link State Update[%s]: LS age is equal to MaxAge.",
1984 DISCARD_LSA(lsa
, 3);
1987 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1988 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1989 &oi
->ospf
->router_id
)) {
1991 * Even if initial flushing seems to be completed, there
1993 * be a case that self-originated LSA with MaxAge still
1995 * in the routing domain.
1996 * Just send an LSAck message to cease retransmission.
1998 if (IS_LSA_MAXAGE(lsa
)) {
1999 zlog_info("LSA[%s]: Boomerang effect?",
2001 ospf_ls_ack_send(nbr
, lsa
);
2002 ospf_lsa_discard(lsa
);
2004 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2005 ospf_opaque_lsa_refresh_schedule(
2011 * If an instance of self-originated Opaque-LSA is not
2013 * in the LSDB, there are some possible cases here.
2015 * 1) This node lost opaque-capability after restart.
2016 * 2) Else, a part of opaque-type is no more supported.
2017 * 3) Else, a part of opaque-id is no more supported.
2019 * Anyway, it is still this node's responsibility to
2021 * Otherwise, the LSA instance remains in the routing
2023 * until its age reaches to MaxAge.
2025 /* XXX: We should deal with this for *ALL* LSAs, not
2027 if (current
== NULL
) {
2028 if (IS_DEBUG_OSPF_EVENT
)
2030 "LSA[%s]: Previously originated Opaque-LSA,not found in the LSDB.",
2033 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2035 ospf_ls_ack_send(nbr
, lsa
);
2037 if (!ospf
->gr_info
.restart_in_progress
) {
2038 ospf_opaque_self_originated_lsa_received(
2045 /* It might be happen that received LSA is self-originated
2047 * router ID is changed. So, we should check if LSA is a
2049 * Link State ID is one of the router's own IP interface
2050 * addresses but whose
2051 * Advertising Router is not equal to the router's own Router ID
2052 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2056 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2057 struct listnode
*oinode
, *oinnode
;
2058 struct ospf_interface
*out_if
;
2061 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2066 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2068 && (!(IPV4_ADDR_SAME(
2069 &oi
->ospf
->router_id
,
2070 &lsa
->data
->adv_router
)))) {
2071 if (out_if
->network_lsa_self
) {
2072 ospf_lsa_flush_area(
2074 if (IS_DEBUG_OSPF_EVENT
)
2076 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2080 ospf_lsa_discard(lsa
);
2090 /* (5) Find the instance of this LSA that is currently contained
2091 in the router's link state database. If there is no
2092 database copy, or the received LSA is more recent than
2093 the database copy the following steps must be performed.
2094 (The sub steps from RFC 2328 section 13 step (5) will be
2099 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2101 if (current
&& (IS_LSA_MAX_SEQ(current
))
2102 && (IS_LSA_MAX_SEQ(lsa
)) && !IS_LSA_MAXAGE(lsa
)) {
2104 "Link State Update[%s]: has Max Seq and higher checksum but not MaxAge. Dropping it",
2107 DISCARD_LSA(lsa
, 4);
2110 /* Actual flooding procedure. */
2111 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2112 < 0) /* Trap NSSA later. */
2113 DISCARD_LSA(lsa
, 5);
2117 /* (6) Else, If there is an instance of the LSA on the sending
2118 neighbor's Link state request list, an error has occurred in
2119 the Database Exchange process. In this case, restart the
2120 Database Exchange process by generating the neighbor event
2121 BadLSReq for the sending neighbor and stop processing the
2122 Link State Update packet. */
2124 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2125 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2128 "LSA[%s] instance exists on Link state request list",
2131 /* Clean list of LSAs. */
2132 ospf_upd_list_clean(lsas
);
2133 /* this lsa is not on lsas list already. */
2134 ospf_lsa_discard(lsa
);
2138 /* If the received LSA is the same instance as the database copy
2139 (i.e., neither one is more recent) the following two steps
2140 should be performed: */
2143 /* If the LSA is listed in the Link state retransmission
2145 for the receiving adjacency, the router itself is
2147 an acknowledgment for this LSA. The router should
2149 received LSA as an acknowledgment by removing the LSA
2151 the Link state retransmission list. This is termed
2153 "implied acknowledgment". */
2155 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2157 if (ls_ret
!= NULL
) {
2158 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2160 /* Delayed acknowledgment sent if advertisement
2162 from Designated Router, otherwise do nothing.
2164 if (oi
->state
== ISM_Backup
)
2168 ospf_lsa_lock(lsa
));
2170 DISCARD_LSA(lsa
, 6);
2172 /* Acknowledge the receipt of the LSA by sending a
2173 Link State Acknowledgment packet back out the
2177 ospf_ls_ack_send(nbr
, lsa
);
2178 DISCARD_LSA(lsa
, 7);
2182 /* The database copy is more recent. If the database copy
2183 has LS age equal to MaxAge and LS sequence number equal to
2184 MaxSequenceNumber, simply discard the received LSA without
2185 acknowledging it. (In this case, the LSA's LS sequence number
2187 wrapping, and the MaxSequenceNumber LSA must be completely
2188 flushed before any new LSA instance can be introduced). */
2190 else if (ret
> 0) /* Database copy is more recent */
2192 if (IS_LSA_MAXAGE(current
)
2193 && current
->data
->ls_seqnum
2194 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2195 DISCARD_LSA(lsa
, 8);
2197 /* Otherwise, as long as the database copy has not been
2199 Link State Update within the last MinLSArrival
2201 database copy back to the sending neighbor,
2203 a Link State Update Packet. The Link State Update
2205 be sent directly to the neighbor. In so doing, do not
2207 database copy of the LSA on the neighbor's link state
2208 retransmission list, and do not acknowledge the
2210 recent) LSA instance. */
2212 if (monotime_since(¤t
->tv_orig
, NULL
)
2213 >= ospf
->min_ls_arrival
* 1000LL)
2214 /* Trap NSSA type later.*/
2215 ospf_ls_upd_send_lsa(
2217 OSPF_SEND_PACKET_DIRECT
);
2218 DISCARD_LSA(lsa
, 9);
2224 assert(listcount(lsas
) == 0);
2227 if (ospf
->gr_info
.restart_in_progress
)
2228 ospf_gr_check_lsdb_consistency(oi
->ospf
, oi
->area
);
2231 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2232 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2233 struct stream
*s
, struct ospf_interface
*oi
,
2236 struct ospf_neighbor
*nbr
;
2238 /* increment statistics. */
2241 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2243 flog_warn(EC_OSPF_PACKET
,
2244 "Link State Acknowledgment: Unknown Neighbor %pI4",
2249 if (nbr
->state
< NSM_Exchange
) {
2250 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2252 "Link State Acknowledgment: Neighbor[%pI4] state %s is less than Exchange",
2254 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2259 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2260 struct ospf_lsa
*lsa
, *lsr
;
2262 lsa
= ospf_lsa_new();
2263 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2264 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2266 /* lsah = (struct lsa_header *) stream_pnt (s); */
2267 size
-= OSPF_LSA_HEADER_SIZE
;
2268 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2270 if (lsa
->data
->type
< OSPF_MIN_LSA
2271 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2273 ospf_lsa_discard(lsa
);
2277 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2279 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0) {
2280 ospf_ls_retransmit_delete(nbr
, lsr
);
2281 ospf_check_and_gen_init_seq_lsa(oi
, lsa
);
2285 ospf_lsa_discard(lsa
);
2291 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2292 struct interface
**ifp
,
2293 struct stream
*ibuf
)
2298 ifindex_t ifindex
= 0;
2300 /* Header and data both require alignment. */
2301 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2304 memset(&msgh
, 0, sizeof(msgh
));
2305 msgh
.msg_iov
= &iov
;
2306 msgh
.msg_iovlen
= 1;
2307 msgh
.msg_control
= (caddr_t
)buff
;
2308 msgh
.msg_controllen
= sizeof(buff
);
2310 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, MSG_DONTWAIT
,
2311 OSPF_MAX_PACKET_SIZE
+ 1);
2313 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
)
2314 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2315 safe_strerror(errno
));
2318 if ((unsigned int)ret
< sizeof(struct ip
)) {
2321 "ospf_recv_packet: discarding runt packet of length %d (ip header size is %u)",
2322 ret
, (unsigned int)sizeof(iph
));
2326 /* Note that there should not be alignment problems with this assignment
2327 because this is at the beginning of the stream data buffer. */
2328 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2329 sockopt_iphdrincl_swab_systoh(iph
);
2331 ip_len
= iph
->ip_len
;
2333 #if defined(__FreeBSD__) && (__FreeBSD_version < 1000000)
2335 * Kernel network code touches incoming IP header parameters,
2336 * before protocol specific processing.
2338 * 1) Convert byteorder to host representation.
2339 * --> ip_len, ip_id, ip_off
2341 * 2) Adjust ip_len to strip IP header size!
2342 * --> If user process receives entire IP packet via RAW
2343 * socket, it must consider adding IP header size to
2344 * the "ip_len" field of "ip" structure.
2346 * For more details, see <netinet/ip_input.c>.
2348 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2351 #if defined(__DragonFly__)
2353 * in DragonFly's raw socket, ip_len/ip_off are read
2354 * in network byte order.
2355 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2357 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2360 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2362 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2364 if (ret
!= ip_len
) {
2367 "ospf_recv_packet read length mismatch: ip_len is %d, but recvmsg returned %d",
2372 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2373 zlog_debug("%s: fd %d(%s) on interface %d(%s)", __func__
, fd
,
2374 ospf_get_name(ospf
), ifindex
,
2375 *ifp
? (*ifp
)->name
: "Unknown");
2379 static struct ospf_interface
*
2380 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2381 struct ip
*iph
, struct ospf_header
*ospfh
)
2383 struct ospf_interface
*rcv_oi
;
2384 struct ospf_vl_data
*vl_data
;
2385 struct ospf_area
*vl_area
;
2386 struct listnode
*node
;
2388 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2389 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2392 /* look for local OSPF interface matching the destination
2393 * to determine Area ID. We presume therefore the destination address
2394 * is unique, or at least (for "unnumbered" links), not used in other
2397 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2401 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2403 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2407 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2408 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2409 if (IS_DEBUG_OSPF_EVENT
)
2410 zlog_debug("associating packet with %s",
2411 IF_NAME(vl_data
->vl_oi
));
2412 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2413 if (IS_DEBUG_OSPF_EVENT
)
2415 "This VL is not up yet, sorry");
2419 return vl_data
->vl_oi
;
2423 if (IS_DEBUG_OSPF_EVENT
)
2424 zlog_debug("couldn't find any VL to associate the packet with");
2429 static int ospf_check_area_id(struct ospf_interface
*oi
,
2430 struct ospf_header
*ospfh
)
2432 /* Check match the Area ID of the receiving interface. */
2433 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2439 /* Unbound socket will accept any Raw IP packets if proto is matched.
2440 To prevent it, compare src IP address and i/f address with masking
2441 i/f network mask. */
2442 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2443 struct in_addr ip_src
)
2445 struct in_addr mask
, me
, him
;
2447 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2448 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2451 /* Ignore mask check for max prefix length (32) */
2452 if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
2453 && oi
->address
->prefixlen
== IPV4_MAX_BITLEN
)
2456 masklen2ip(oi
->address
->prefixlen
, &mask
);
2458 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2459 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2461 if (IPV4_ADDR_SAME(&me
, &him
))
2467 /* Return 1, if the packet is properly authenticated and checksummed,
2468 0 otherwise. In particular, check that AuType header field is valid and
2469 matches the locally configured AuType, and that D.5 requirements are met. */
2470 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2472 struct crypt_key
*ck
;
2473 uint16_t iface_auth_type
;
2474 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2476 switch (pkt_auth_type
) {
2477 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2478 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2479 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2482 "interface %s: auth-type mismatch, local %s, rcvd Null",
2484 lookup_msg(ospf_auth_type_str
,
2485 iface_auth_type
, NULL
));
2488 if (!ospf_check_sum(ospfh
)) {
2489 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2492 "interface %s: Null auth OK, but checksum error, Router-ID %pI4",
2498 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2499 if (OSPF_AUTH_SIMPLE
2500 != (iface_auth_type
= ospf_auth_type(oi
))) {
2501 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2504 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2506 lookup_msg(ospf_auth_type_str
,
2507 iface_auth_type
, NULL
));
2510 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2511 OSPF_AUTH_SIMPLE_SIZE
)) {
2512 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2513 flog_warn(EC_OSPF_PACKET
,
2514 "interface %s: Simple auth failed",
2518 if (!ospf_check_sum(ospfh
)) {
2519 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2522 "interface %s: Simple auth OK, checksum error, Router-ID %pI4",
2528 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2529 if (OSPF_AUTH_CRYPTOGRAPHIC
2530 != (iface_auth_type
= ospf_auth_type(oi
))) {
2531 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2534 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2536 lookup_msg(ospf_auth_type_str
,
2537 iface_auth_type
, NULL
));
2540 if (ospfh
->checksum
) {
2541 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2544 "interface %s: OSPF header checksum is not 0",
2548 /* only MD5 crypto method can pass ospf_packet_examin() */
2549 if (NULL
== (ck
= listgetdata(
2550 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2551 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2552 /* Condition above uses the last key ID on the list,
2554 different from what ospf_crypt_key_lookup() does. A
2556 !ospf_check_md5_digest(oi
, ospfh
)) {
2557 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2558 flog_warn(EC_OSPF_MD5
,
2559 "interface %s: MD5 auth failed",
2565 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2568 "interface %s: invalid packet auth-type (%02x)",
2569 IF_NAME(oi
), pkt_auth_type
);
2574 static int ospf_check_sum(struct ospf_header
*ospfh
)
2579 /* clear auth_data for checksum. */
2580 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2582 /* keep checksum and clear. */
2583 sum
= ospfh
->checksum
;
2584 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2586 /* calculate checksum. */
2587 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2590 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2598 /* Verify, that given link/TOS records are properly sized/aligned and match
2599 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2600 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2602 const uint16_t num_links
)
2604 unsigned counted_links
= 0, thislinklen
;
2606 while (linkbytes
>= OSPF_ROUTER_LSA_LINK_SIZE
) {
2608 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2609 if (thislinklen
> linkbytes
) {
2610 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2611 zlog_debug("%s: length error in link block #%u",
2612 __func__
, counted_links
);
2615 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2616 linkbytes
-= thislinklen
;
2619 if (counted_links
!= num_links
) {
2620 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2621 zlog_debug("%s: %u link blocks declared, %u present",
2622 __func__
, num_links
, counted_links
);
2628 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2629 minimum length constraint). */
2630 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2631 const uint8_t headeronly
)
2634 struct router_lsa
*rlsa
;
2635 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2636 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2637 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2638 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2639 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2643 switch (lsah
->type
) {
2644 case OSPF_ROUTER_LSA
: {
2646 * RFC2328 A.4.2, LSA header + 4 bytes followed by N>=0
2647 * (12+)-byte link blocks
2649 size_t linkbytes_len
= lsalen
- OSPF_LSA_HEADER_SIZE
2650 - OSPF_ROUTER_LSA_MIN_SIZE
;
2653 * LSA link blocks are variable length but always multiples of
2654 * 4; basic sanity check
2656 if (linkbytes_len
% 4 != 0)
2662 rlsa
= (struct router_lsa
*)lsah
;
2664 ret
= ospf_router_lsa_links_examin(
2665 (struct router_lsa_link
*)rlsa
->link
,
2667 ntohs(rlsa
->links
));
2670 case OSPF_AS_EXTERNAL_LSA
:
2671 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2673 case OSPF_AS_NSSA_LSA
:
2674 /* RFC3101 C, idem */
2675 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2676 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2681 /* Following LSA types are considered OK length-wise as soon as their
2683 * length constraint is met and length of the whole LSA is a multiple of
2685 * (basic LSA header size is already a multiple of 4). */
2686 case OSPF_NETWORK_LSA
:
2687 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2688 case OSPF_SUMMARY_LSA
:
2689 case OSPF_ASBR_SUMMARY_LSA
:
2690 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2692 case OSPF_OPAQUE_LINK_LSA
:
2693 case OSPF_OPAQUE_AREA_LSA
:
2694 case OSPF_OPAQUE_AS_LSA
:
2695 /* RFC5250 A.2, "some number of octets (of application-specific
2696 * data) padded to 32-bit alignment." This is considered
2698 * to 4-byte alignment of all other LSA types, see
2699 * OSPF-ALIGNMENT.txt
2700 * file for the detailed analysis of this passage. */
2701 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2704 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2705 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2709 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2710 zlog_debug("%s: alignment error in %s", __func__
,
2711 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2715 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2716 includes verification of LSA blocks length/alignment and dispatching
2717 of deeper-level checks. */
2719 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2720 size_t length
, const uint8_t headeronly
,
2721 /* When declared_num_lsas is not 0, compare it to the real
2723 and treat the difference as an error. */
2724 const uint32_t declared_num_lsas
)
2726 uint32_t counted_lsas
= 0;
2730 if (length
< OSPF_LSA_HEADER_SIZE
) {
2731 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2733 "%s: undersized (%zu B) trailing (#%u) LSA header",
2734 __func__
, length
, counted_lsas
);
2737 /* save on ntohs() calls here and in the LSA validator */
2738 lsalen
= ntohs(lsah
->length
);
2739 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2740 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2742 "%s: malformed LSA header #%u, declared length is %u B",
2743 __func__
, counted_lsas
, lsalen
);
2747 /* less checks here and in ospf_lsa_examin() */
2748 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2749 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2751 "%s: malformed header-only LSA #%u",
2752 __func__
, counted_lsas
);
2755 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2756 + OSPF_LSA_HEADER_SIZE
);
2757 length
-= OSPF_LSA_HEADER_SIZE
;
2759 /* make sure the input buffer is deep enough before
2761 if (lsalen
> length
) {
2762 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2764 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2765 __func__
, counted_lsas
, lsalen
,
2769 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2770 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2771 zlog_debug("%s: malformed LSA #%u",
2772 __func__
, counted_lsas
);
2775 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2781 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2782 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2784 "%s: #LSAs declared (%u) does not match actual (%u)",
2785 __func__
, declared_num_lsas
, counted_lsas
);
2791 /* Verify a complete OSPF packet for proper sizing/alignment. */
2792 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2793 const unsigned bytesonwire
)
2795 uint16_t bytesdeclared
, bytesauth
;
2797 struct ospf_ls_update
*lsupd
;
2799 /* Length, 1st approximation. */
2800 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2801 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2802 zlog_debug("%s: undersized (%u B) packet", __func__
,
2806 /* Now it is safe to access header fields. Performing length check,
2808 * for possible extra bytes of crypto auth/padding, which are not
2810 * in the OSPF header "length" field. */
2811 if (oh
->version
!= OSPF_VERSION
) {
2812 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2813 zlog_debug("%s: invalid (%u) protocol version",
2814 __func__
, oh
->version
);
2817 bytesdeclared
= ntohs(oh
->length
);
2818 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2821 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2822 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2824 "%s: unsupported crypto auth length (%u B)",
2825 __func__
, oh
->u
.crypt
.auth_data_len
);
2828 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2830 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2831 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2833 "%s: packet length error (%u real, %u+%u declared)",
2834 __func__
, bytesonwire
, bytesdeclared
,
2838 /* Length, 2nd approximation. The type-specific constraint is checked
2839 against declared length, not amount of bytes on wire. */
2840 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2842 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2843 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2844 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2846 lookup_msg(ospf_packet_type_str
, oh
->type
,
2851 case OSPF_MSG_HELLO
:
2852 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2854 by N>=0 router-IDs. */
2855 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2860 case OSPF_MSG_DB_DESC
:
2861 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2863 by N>=0 header-only LSAs. */
2864 ret
= ospf_lsaseq_examin(
2865 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2866 + OSPF_DB_DESC_MIN_SIZE
),
2867 bytesdeclared
- OSPF_HEADER_SIZE
2868 - OSPF_DB_DESC_MIN_SIZE
,
2869 1, /* header-only LSAs */
2872 case OSPF_MSG_LS_REQ
:
2873 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2874 * request blocks. */
2875 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2880 case OSPF_MSG_LS_UPD
:
2881 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2883 by N>=0 full LSAs (with N declared beforehand). */
2884 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2885 + OSPF_HEADER_SIZE
);
2886 ret
= ospf_lsaseq_examin(
2887 (struct lsa_header
*)((caddr_t
)lsupd
2888 + OSPF_LS_UPD_MIN_SIZE
),
2889 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2891 ntohl(lsupd
->num_lsas
) /* 32 bits */
2894 case OSPF_MSG_LS_ACK
:
2895 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2897 ret
= ospf_lsaseq_examin(
2898 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2899 + OSPF_LS_ACK_MIN_SIZE
),
2900 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2901 1, /* header-only LSAs */
2905 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2906 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2910 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2911 zlog_debug("%s: malformed %s packet", __func__
,
2912 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2916 /* OSPF Header verification. */
2917 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2918 struct ip
*iph
, struct ospf_header
*ospfh
)
2920 /* Check Area ID. */
2921 if (!ospf_check_area_id(oi
, ospfh
)) {
2922 flog_warn(EC_OSPF_PACKET
,
2923 "interface %s: ospf_read invalid Area ID %pI4",
2924 IF_NAME(oi
), &ospfh
->area_id
);
2928 /* Check network mask, Silently discarded. */
2929 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2932 "interface %s: ospf_read network address is not same [%pI4]",
2933 IF_NAME(oi
), &iph
->ip_src
);
2937 /* Check authentication. The function handles logging actions, where
2939 if (!ospf_check_auth(oi
, ospfh
))
2945 enum ospf_read_return_enum
{
2950 static enum ospf_read_return_enum
ospf_read_helper(struct ospf
*ospf
)
2953 struct stream
*ibuf
;
2954 struct ospf_interface
*oi
;
2956 struct ospf_header
*ospfh
;
2958 struct connected
*c
;
2959 struct interface
*ifp
= NULL
;
2961 stream_reset(ospf
->ibuf
);
2962 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2964 return OSPF_READ_ERROR
;
2967 * This raw packet is known to be at least as big as its
2968 * IP header. Note that there should not be alignment problems with
2969 * this assignment because this is at the beginning of the
2970 * stream data buffer.
2972 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2974 * Note that sockopt_iphdrincl_swab_systoh was called in
2979 * Handle cases where the platform does not support
2980 * retrieving the ifindex, and also platforms (such as
2981 * Solaris 8) that claim to support ifindex retrieval but do
2984 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2989 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2991 "%s: Unable to determine incoming interface from: %pI4(%s)",
2992 __func__
, &iph
->ip_src
,
2993 ospf_get_name(ospf
));
2994 return OSPF_READ_CONTINUE
;
2998 if (ospf
->vrf_id
== VRF_DEFAULT
&& ospf
->vrf_id
!= ifp
->vrf
->vrf_id
) {
3000 * We may have a situation where l3mdev_accept == 1
3001 * let's just kindly drop the packet and move on.
3002 * ospf really really really does not like when
3003 * we receive the same packet multiple times.
3005 return OSPF_READ_CONTINUE
;
3008 /* Self-originated packet should be discarded silently. */
3009 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
3010 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
3012 "ospf_read[%pI4]: Dropping self-originated packet",
3015 return OSPF_READ_CONTINUE
;
3018 /* Check that we have enough for an IP header */
3019 if ((unsigned int)(iph
->ip_hl
<< 2) >= STREAM_READABLE(ibuf
)) {
3020 if ((unsigned int)(iph
->ip_hl
<< 2) == STREAM_READABLE(ibuf
)) {
3023 "Rx'd IP packet with OSPF protocol number but no payload");
3027 "IP header length field claims header is %u bytes, but we only have %zu",
3028 (unsigned int)(iph
->ip_hl
<< 2),
3029 STREAM_READABLE(ibuf
));
3032 return OSPF_READ_ERROR
;
3034 stream_forward_getp(ibuf
, iph
->ip_hl
<< 2);
3036 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
3038 != ospf_packet_examin(ospfh
, stream_get_endp(ibuf
)
3039 - stream_get_getp(ibuf
)))
3040 return OSPF_READ_CONTINUE
;
3041 /* Now it is safe to access all fields of OSPF packet header. */
3043 /* associate packet with ospf interface */
3044 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
3047 * ospf_verify_header() relies on a valid "oi" and thus can be called
3048 * only after the passive/backbone/other checks below are passed.
3049 * These checks in turn access the fields of unverified "ospfh"
3050 * structure for their own purposes and must remain very accurate
3054 /* If incoming interface is passive one, ignore it. */
3055 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3056 if (IS_DEBUG_OSPF_EVENT
)
3058 "ignoring packet from router %pI4 sent to %pI4, received on a passive interface, %pI4",
3059 &ospfh
->router_id
, &iph
->ip_dst
,
3060 &oi
->address
->u
.prefix4
);
3062 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3063 /* Try to fix multicast membership.
3064 * Some OS:es may have problems in this area,
3065 * make sure it is removed.
3067 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3068 ospf_if_set_multicast(oi
);
3070 return OSPF_READ_CONTINUE
;
3074 /* if no local ospf_interface,
3075 * or header area is backbone but ospf_interface is not
3076 * check for VLINK interface
3079 || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3080 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3081 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3083 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3085 "Packet from [%pI4] received on link %s but no ospf_interface",
3086 &iph
->ip_src
, ifp
->name
);
3087 return OSPF_READ_CONTINUE
;
3092 * else it must be a local ospf interface, check it was
3093 * received on correct link
3095 else if (oi
->ifp
!= ifp
) {
3096 if (IS_DEBUG_OSPF_EVENT
)
3097 flog_warn(EC_OSPF_PACKET
,
3098 "Packet from [%pI4] received on wrong link %s",
3099 &iph
->ip_src
, ifp
->name
);
3100 return OSPF_READ_CONTINUE
;
3101 } else if (oi
->state
== ISM_Down
) {
3104 "Ignoring packet from %pI4 to %pI4 received on interface that is down [%s]; interface flags are %s",
3105 &iph
->ip_src
, &iph
->ip_dst
, ifp
->name
,
3106 if_flag_dump(ifp
->flags
));
3107 /* Fix multicast memberships? */
3108 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3109 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3110 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3111 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3112 if (oi
->multicast_memberships
)
3113 ospf_if_set_multicast(oi
);
3114 return OSPF_READ_CONTINUE
;
3118 * If the received packet is destined for AllDRouters, the
3119 * packet should be accepted only if the received ospf
3120 * interface state is either DR or Backup -- endo.
3122 * I wonder who endo is?
3124 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3125 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3128 "Dropping packet for AllDRouters from [%pI4] via [%s] (ISM: %s)",
3129 &iph
->ip_src
, IF_NAME(oi
),
3130 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3131 /* Try to fix multicast membership. */
3132 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3133 ospf_if_set_multicast(oi
);
3134 return OSPF_READ_CONTINUE
;
3137 /* Verify more OSPF header fields. */
3138 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3140 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3142 "ospf_read[%pI4]: Header check failed, dropping.",
3144 return OSPF_READ_CONTINUE
;
3147 /* Show debug receiving packet. */
3148 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3149 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3151 "-----------------------------------------------------");
3152 ospf_packet_dump(ibuf
);
3155 zlog_debug("%s received from [%pI4] via [%s]",
3156 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3157 &ospfh
->router_id
, IF_NAME(oi
));
3158 zlog_debug(" src [%pI4],", &iph
->ip_src
);
3159 zlog_debug(" dst [%pI4]", &iph
->ip_dst
);
3161 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3163 "-----------------------------------------------------");
3166 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3168 /* Adjust size to message length. */
3169 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3171 /* Read rest of the packet and call each sort of packet routine.
3173 switch (ospfh
->type
) {
3174 case OSPF_MSG_HELLO
:
3175 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3177 case OSPF_MSG_DB_DESC
:
3178 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3180 case OSPF_MSG_LS_REQ
:
3181 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3183 case OSPF_MSG_LS_UPD
:
3184 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3186 case OSPF_MSG_LS_ACK
:
3187 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3192 "interface %s(%s): OSPF packet header type %d is illegal",
3193 IF_NAME(oi
), ospf_get_name(ospf
), ospfh
->type
);
3197 return OSPF_READ_CONTINUE
;
3200 /* Starting point of packet process function. */
3201 void ospf_read(struct thread
*thread
)
3205 enum ospf_read_return_enum ret
;
3207 /* first of all get interface pointer. */
3208 ospf
= THREAD_ARG(thread
);
3210 /* prepare for next packet. */
3211 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
3213 while (count
< ospf
->write_oi_count
) {
3215 ret
= ospf_read_helper(ospf
);
3217 case OSPF_READ_ERROR
:
3219 case OSPF_READ_CONTINUE
:
3225 /* Make OSPF header. */
3226 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3229 struct ospf_header
*ospfh
;
3231 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3233 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3234 ospfh
->type
= (uint8_t)type
;
3236 ospfh
->router_id
= oi
->ospf
->router_id
;
3238 ospfh
->checksum
= 0;
3239 ospfh
->area_id
= oi
->area
->area_id
;
3240 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3242 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3244 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3247 /* Make Authentication Data. */
3248 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3250 struct crypt_key
*ck
;
3252 switch (ospf_auth_type(oi
)) {
3253 case OSPF_AUTH_NULL
:
3254 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3257 case OSPF_AUTH_SIMPLE
:
3258 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3259 OSPF_AUTH_SIMPLE_SIZE
);
3261 case OSPF_AUTH_CRYPTOGRAPHIC
:
3262 /* If key is not set, then set 0. */
3263 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3264 ospfh
->u
.crypt
.zero
= 0;
3265 ospfh
->u
.crypt
.key_id
= 0;
3266 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3269 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3270 ospfh
->u
.crypt
.zero
= 0;
3271 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3272 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3274 /* note: the seq is done in ospf_make_md5_digest() */
3277 /* memset (ospfh->u.auth_data, 0, sizeof(ospfh->u.auth_data));
3285 /* Fill rest of OSPF header. */
3286 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3289 struct ospf_header
*ospfh
;
3291 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3294 ospfh
->length
= htons(length
);
3296 /* Calculate checksum. */
3297 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3298 ospfh
->checksum
= in_cksum(ospfh
, length
);
3300 ospfh
->checksum
= 0;
3302 /* Add Authentication Data. */
3303 ospf_make_auth(oi
, ospfh
);
3306 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3308 struct ospf_neighbor
*nbr
;
3309 struct route_node
*rn
;
3310 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3311 struct in_addr mask
;
3315 /* Set netmask of interface. */
3316 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3317 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3318 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3319 masklen2ip(oi
->address
->prefixlen
, &mask
);
3321 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3322 stream_put_ipv4(s
, mask
.s_addr
);
3324 /* Set Hello Interval. */
3325 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3326 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3328 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3330 if (IS_DEBUG_OSPF_EVENT
)
3331 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3335 stream_putc(s
, OPTIONS(oi
));
3337 /* Set Router Priority. */
3338 stream_putc(s
, PRIORITY(oi
));
3340 /* Set Router Dead Interval. */
3341 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3343 /* Set Designated Router. */
3344 stream_put_ipv4(s
, DR(oi
).s_addr
);
3346 p
= stream_get_endp(s
);
3348 /* Set Backup Designated Router. */
3349 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3351 /* Add neighbor seen. */
3352 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3353 if ((nbr
= rn
->info
))
3354 if (nbr
->router_id
.s_addr
3355 != INADDR_ANY
) /* Ignore 0.0.0.0 node. */
3357 != NSM_Attempt
) /* Ignore Down neighbor. */
3359 != NSM_Down
) /* This is myself for
3361 if (!IPV4_ADDR_SAME(
3363 &oi
->ospf
->router_id
)) {
3364 /* Check neighbor is
3366 if (nbr
->d_router
.s_addr
3380 /* Hello packet overflows interface MTU. */
3381 if (length
+ sizeof(uint32_t)
3382 > ospf_packet_max(oi
)) {
3384 EC_OSPF_LARGE_HELLO
,
3385 "Oversized Hello packet! Larger than MTU. Not sending it out");
3396 /* Let neighbor generate BackupSeen. */
3398 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3403 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3404 struct ospf_neighbor
*nbr
, struct stream
*s
)
3406 struct ospf_lsa
*lsa
;
3407 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3411 struct ospf_lsdb
*lsdb
;
3413 /* Set Interface MTU. */
3414 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3417 stream_putw(s
, oi
->ifp
->mtu
);
3420 options
= OPTIONS(oi
);
3421 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3422 SET_FLAG(options
, OSPF_OPTION_O
);
3423 stream_putc(s
, options
);
3426 pp
= stream_get_endp(s
);
3427 stream_putc(s
, nbr
->dd_flags
);
3429 /* Set DD Sequence Number. */
3430 stream_putl(s
, nbr
->dd_seqnum
);
3432 /* shortcut unneeded walk of (empty) summary LSDBs */
3433 if (ospf_db_summary_isempty(nbr
))
3436 /* Describe LSA Header from Database Summary List. */
3437 lsdb
= &nbr
->db_sum
;
3439 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3440 struct route_table
*table
= lsdb
->type
[i
].db
;
3441 struct route_node
*rn
;
3443 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3444 if ((lsa
= rn
->info
) != NULL
) {
3445 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3446 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3447 /* Suppress advertising
3448 * opaque-information. */
3449 /* Remove LSA from DB summary list. */
3450 ospf_lsdb_delete(lsdb
, lsa
);
3454 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3455 struct lsa_header
*lsah
;
3458 /* DD packet overflows interface MTU. */
3459 if (length
+ OSPF_LSA_HEADER_SIZE
3460 > ospf_packet_max(oi
))
3463 /* Keep pointer to LS age. */
3464 lsah
= (struct lsa_header
3469 /* Proceed stream pointer. */
3470 stream_put(s
, lsa
->data
,
3471 OSPF_LSA_HEADER_SIZE
);
3472 length
+= OSPF_LSA_HEADER_SIZE
;
3475 ls_age
= LS_AGE(lsa
);
3476 lsah
->ls_age
= htons(ls_age
);
3479 /* Remove LSA from DB summary list. */
3480 ospf_lsdb_delete(lsdb
, lsa
);
3484 /* Update 'More' bit */
3485 if (ospf_db_summary_isempty(nbr
)) {
3487 if (nbr
->state
>= NSM_Exchange
) {
3488 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3489 /* Rewrite DD flags */
3490 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3492 assert(IS_SET_DD_M(nbr
->dd_flags
));
3498 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3499 unsigned long delta
, struct ospf_neighbor
*nbr
,
3500 struct ospf_lsa
*lsa
)
3502 struct ospf_interface
*oi
;
3506 /* LS Request packet overflows interface MTU
3507 * delta is just number of bytes required for 1 LS Req
3508 * ospf_packet_max will return the number of bytes can
3509 * be accommodated without ospf header. So length+delta
3510 * can be compared to ospf_packet_max
3511 * to check if it can fit another lsreq in the same packet.
3514 if (*length
+ delta
> ospf_packet_max(oi
))
3517 stream_putl(s
, lsa
->data
->type
);
3518 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3519 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3521 ospf_lsa_unlock(&nbr
->ls_req_last
);
3522 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3528 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3530 struct ospf_lsa
*lsa
;
3531 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3532 unsigned long delta
= 12;
3533 struct route_table
*table
;
3534 struct route_node
*rn
;
3536 struct ospf_lsdb
*lsdb
;
3538 lsdb
= &nbr
->ls_req
;
3540 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3541 table
= lsdb
->type
[i
].db
;
3542 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3543 if ((lsa
= (rn
->info
)) != NULL
)
3544 if (ospf_make_ls_req_func(s
, &length
, delta
,
3547 route_unlock_node(rn
);
3554 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3558 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3560 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3563 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3566 struct ospf_lsa
*lsa
;
3567 struct listnode
*node
;
3568 uint16_t length
= 0;
3569 unsigned int size_noauth
;
3570 unsigned long delta
= stream_get_endp(s
);
3574 if (IS_DEBUG_OSPF_EVENT
)
3575 zlog_debug("ospf_make_ls_upd: Start");
3577 pp
= stream_get_endp(s
);
3578 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3579 length
+= OSPF_LS_UPD_MIN_SIZE
;
3581 /* Calculate amount of packet usable for data. */
3582 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3584 while ((node
= listhead(update
)) != NULL
) {
3585 struct lsa_header
*lsah
;
3588 lsa
= listgetdata(node
);
3591 if (IS_DEBUG_OSPF_EVENT
)
3592 zlog_debug("%s: List Iteration %d LSA[%s]", __func__
,
3593 count
, dump_lsa_key(lsa
));
3595 /* Will it fit? Minimum it has to fit at least one */
3596 if ((length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
) &&
3600 /* Keep pointer to LS age. */
3601 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3602 + stream_get_endp(s
));
3604 /* Put LSA to Link State Request. */
3605 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3608 /* each hop must increment an lsa_age by transmit_delay
3609 of OSPF interface */
3610 ls_age
= ls_age_increment(lsa
,
3611 OSPF_IF_PARAM(oi
, transmit_delay
));
3612 lsah
->ls_age
= htons(ls_age
);
3614 length
+= ntohs(lsa
->data
->length
);
3617 list_delete_node(update
, node
);
3618 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3621 /* Now set #LSAs. */
3622 stream_putl_at(s
, pp
, count
);
3624 if (IS_DEBUG_OSPF_EVENT
)
3625 zlog_debug("ospf_make_ls_upd: Stop");
3629 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3632 struct listnode
*node
, *nnode
;
3633 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3634 unsigned long delta
= OSPF_LSA_HEADER_SIZE
;
3635 struct ospf_lsa
*lsa
;
3637 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3640 /* LS Ack packet overflows interface MTU
3641 * delta is just number of bytes required for
3642 * 1 LS Ack(1 LS Hdr) ospf_packet_max will return
3643 * the number of bytes can be accommodated without
3644 * ospf header. So length+delta can be compared
3645 * against ospf_packet_max to check if it can fit
3646 * another ls header in the same packet.
3648 if ((length
+ delta
) > ospf_packet_max(oi
))
3651 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3652 length
+= OSPF_LSA_HEADER_SIZE
;
3654 listnode_delete(ack
, lsa
);
3655 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3661 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3663 struct ospf_packet
*op
;
3664 uint16_t length
= OSPF_HEADER_SIZE
;
3666 op
= ospf_packet_new(oi
->ifp
->mtu
);
3668 /* Prepare OSPF common header. */
3669 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3671 /* Prepare OSPF Hello body. */
3672 length
+= ospf_make_hello(oi
, op
->s
);
3673 if (length
== OSPF_HEADER_SIZE
) {
3674 /* Hello overshooting MTU */
3675 ospf_packet_free(op
);
3679 /* Fill OSPF header. */
3680 ospf_fill_header(oi
, op
->s
, length
);
3682 /* Set packet length. */
3683 op
->length
= length
;
3685 op
->dst
.s_addr
= addr
;
3687 if (IS_DEBUG_OSPF_EVENT
) {
3688 if (oi
->ospf
->vrf_id
)
3690 "%s: Hello Tx interface %s ospf vrf %s id %u",
3691 __func__
, oi
->ifp
->name
,
3692 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3695 /* Add packet to the top of the interface output queue, so that they
3696 * can't get delayed by things like long queues of LS Update packets
3698 ospf_packet_add_top(oi
, op
);
3700 /* Hook thread to write packet. */
3701 OSPF_ISM_WRITE_ON(oi
->ospf
);
3704 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3706 struct ospf_interface
*oi
;
3711 /* If this is passive interface, do not send OSPF Hello. */
3712 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3715 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3718 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3721 if (PRIORITY(oi
) == 0)
3724 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3725 && oi
->state
!= ISM_Backup
)
3728 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3731 void ospf_poll_timer(struct thread
*thread
)
3733 struct ospf_nbr_nbma
*nbr_nbma
;
3735 nbr_nbma
= THREAD_ARG(thread
);
3736 nbr_nbma
->t_poll
= NULL
;
3738 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3739 zlog_debug("NSM[%s:%pI4]: Timer (Poll timer expire)",
3740 IF_NAME(nbr_nbma
->oi
), &nbr_nbma
->addr
);
3742 ospf_poll_send(nbr_nbma
);
3744 if (nbr_nbma
->v_poll
> 0)
3745 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3750 void ospf_hello_reply_timer(struct thread
*thread
)
3752 struct ospf_neighbor
*nbr
;
3754 nbr
= THREAD_ARG(thread
);
3755 nbr
->t_hello_reply
= NULL
;
3757 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3758 zlog_debug("NSM[%s:%pI4]: Timer (hello-reply timer expire)",
3759 IF_NAME(nbr
->oi
), &nbr
->router_id
);
3761 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3764 /* Send OSPF Hello. */
3765 void ospf_hello_send(struct ospf_interface
*oi
)
3767 /* If this is passive interface, do not send OSPF Hello. */
3768 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3771 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3772 struct ospf_neighbor
*nbr
;
3773 struct route_node
*rn
;
3775 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3776 if ((nbr
= rn
->info
))
3777 if (nbr
!= oi
->nbr_self
)
3778 if (nbr
->state
!= NSM_Down
) {
3779 /* RFC 2328 Section 9.5.1
3780 If the router is not
3781 eligible to become Designated
3783 it must periodically send
3784 Hello Packets to both the
3785 Designated Router and the
3786 Backup Designated Router (if
3789 if (PRIORITY(oi
) == 0
3800 /* If the router is eligible to
3801 become Designated Router, it
3802 must periodically send Hello
3803 Packets to all neighbors that
3804 are also eligible. In
3805 addition, if the router is
3807 Designated Router or Backup
3808 Designated Router, it must
3810 send periodic Hello Packets
3811 to all other neighbors. */
3813 if (nbr
->priority
== 0
3814 && oi
->state
== ISM_DROther
)
3816 /* if oi->state == Waiting, send
3817 * hello to all neighbors */
3818 ospf_hello_send_sub(
3820 nbr
->address
.u
.prefix4
3824 /* Decide destination address. */
3825 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3826 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3828 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3832 /* Send OSPF Database Description. */
3833 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3835 struct ospf_interface
*oi
;
3836 struct ospf_packet
*op
;
3837 uint16_t length
= OSPF_HEADER_SIZE
;
3840 op
= ospf_packet_new(oi
->ifp
->mtu
);
3842 /* Prepare OSPF common header. */
3843 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3845 /* Prepare OSPF Database Description body. */
3846 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3848 /* Fill OSPF header. */
3849 ospf_fill_header(oi
, op
->s
, length
);
3851 /* Set packet length. */
3852 op
->length
= length
;
3854 /* Decide destination address. */
3855 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3856 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3858 op
->dst
= nbr
->address
.u
.prefix4
;
3860 /* Add packet to the interface output queue. */
3861 ospf_packet_add(oi
, op
);
3863 /* Hook thread to write packet. */
3864 OSPF_ISM_WRITE_ON(oi
->ospf
);
3866 /* Remove old DD packet, then copy new one and keep in neighbor
3869 ospf_packet_free(nbr
->last_send
);
3870 nbr
->last_send
= ospf_packet_dup(op
);
3871 monotime(&nbr
->last_send_ts
);
3872 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3874 "%s:Packet[DD]: %pI4 DB Desc send with seqnum:%x , flags:%x",
3875 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
3876 nbr
->dd_seqnum
, nbr
->dd_flags
);
3879 /* Re-send Database Description. */
3880 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3882 struct ospf_interface
*oi
;
3886 /* Add packet to the interface output queue. */
3887 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3889 /* Hook thread to write packet. */
3890 OSPF_ISM_WRITE_ON(oi
->ospf
);
3891 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_LOG_ADJACENCY_DETAIL
))
3893 "%s:Packet[DD]: %pI4 DB Desc resend with seqnum:%x , flags:%x",
3894 ospf_get_name(oi
->ospf
), &nbr
->router_id
,
3895 nbr
->dd_seqnum
, nbr
->dd_flags
);
3898 /* Send Link State Request. */
3899 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3901 struct ospf_interface
*oi
;
3902 struct ospf_packet
*op
;
3903 uint16_t length
= OSPF_HEADER_SIZE
;
3906 op
= ospf_packet_new(oi
->ifp
->mtu
);
3908 /* Prepare OSPF common header. */
3909 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3911 /* Prepare OSPF Link State Request body. */
3912 length
+= ospf_make_ls_req(nbr
, op
->s
);
3913 if (length
== OSPF_HEADER_SIZE
) {
3914 ospf_packet_free(op
);
3918 /* Fill OSPF header. */
3919 ospf_fill_header(oi
, op
->s
, length
);
3921 /* Set packet length. */
3922 op
->length
= length
;
3924 /* Decide destination address. */
3925 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3926 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3928 op
->dst
= nbr
->address
.u
.prefix4
;
3930 /* Add packet to the interface output queue. */
3931 ospf_packet_add(oi
, op
);
3933 /* Hook thread to write packet. */
3934 OSPF_ISM_WRITE_ON(oi
->ospf
);
3936 /* Add Link State Request Retransmission Timer. */
3937 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3940 /* Send Link State Update with an LSA. */
3941 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3944 struct list
*update
;
3946 update
= list_new();
3948 listnode_add(update
, lsa
);
3950 /*ospf instance is going down, send self originated
3951 * MAXAGE LSA update to neighbors to remove from LSDB */
3952 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3953 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3955 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3957 list_delete(&update
);
3960 /* Determine size for packet. Must be at least big enough to accommodate next
3961 * LSA on list, which may be bigger than MTU size.
3963 * Return pointer to new ospf_packet
3964 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3965 * on packet sizes (in which case offending LSA is deleted from update list)
3967 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3968 struct ospf_interface
*oi
)
3970 struct ospf_lsa
*lsa
;
3971 struct listnode
*ln
;
3973 static char warned
= 0;
3975 lsa
= listgetdata((ln
= listhead(update
)));
3978 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3979 > ospf_packet_max(oi
)) {
3983 "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 ..'");
3987 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3989 "ospf_ls_upd_packet_new: oversized LSA id:%pI4, %d bytes originated by %pI4, will be fragmented!",
3991 ntohs(lsa
->data
->length
),
3992 &lsa
->data
->adv_router
);
3995 * Allocate just enough to fit this LSA only, to avoid including
3997 * LSAs in fragmented LSA Updates.
3999 size
= ntohs(lsa
->data
->length
)
4000 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
4001 + OSPF_LS_UPD_MIN_SIZE
;
4003 size
= oi
->ifp
->mtu
;
4005 if (size
> OSPF_MAX_PACKET_SIZE
) {
4006 flog_warn(EC_OSPF_LARGE_LSA
,
4007 "ospf_ls_upd_packet_new: oversized LSA id:%pI4 too big, %d bytes, packet size %ld, dropping it completely. OSPF routing is broken!",
4008 &lsa
->data
->id
, ntohs(lsa
->data
->length
),
4010 list_delete_node(update
, ln
);
4014 /* IP header is built up separately by ospf_write(). This means, that we
4016 * reduce the "affordable" size just calculated by length of an IP
4018 * This makes sure, that even if we manage to fill the payload with LSA
4020 * completely, the final packet (our data plus IP header) still fits
4022 * outgoing interface MTU. This correction isn't really meaningful for
4024 * oversized LSA, but for consistency the correction is done for both
4027 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
4029 return ospf_packet_new(size
- sizeof(struct ip
));
4032 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
4033 struct list
*update
, struct in_addr addr
,
4036 struct ospf_packet
*op
;
4037 uint16_t length
= OSPF_HEADER_SIZE
;
4039 if (IS_DEBUG_OSPF_EVENT
)
4040 zlog_debug("listcount = %d, [%s]dst %pI4", listcount(update
),
4041 IF_NAME(oi
), &addr
);
4043 /* Check that we have really something to process */
4044 if (listcount(update
) == 0)
4047 op
= ospf_ls_upd_packet_new(update
, oi
);
4049 /* Prepare OSPF common header. */
4050 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
4052 /* Prepare OSPF Link State Update body.
4053 * Includes Type-7 translation.
4055 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
4057 /* Fill OSPF header. */
4058 ospf_fill_header(oi
, op
->s
, length
);
4060 /* Set packet length. */
4061 op
->length
= length
;
4063 /* Decide destination address. */
4064 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4065 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4067 op
->dst
.s_addr
= addr
.s_addr
;
4069 /* Add packet to the interface output queue. */
4070 ospf_packet_add(oi
, op
);
4071 /* Call ospf_write() right away to send ospf packets to neighbors */
4072 if (send_lsupd_now
) {
4073 struct thread os_packet_thd
;
4075 os_packet_thd
.arg
= (void *)oi
->ospf
;
4076 if (oi
->on_write_q
== 0) {
4077 listnode_add(oi
->ospf
->oi_write_q
, oi
);
4080 ospf_write(&os_packet_thd
);
4082 * We are fake calling ospf_write with a fake
4083 * thread. Imagine that we have oi_a already
4084 * enqueued and we have turned on the write
4086 * Now this function calls this for oi_b
4087 * so the on_write_q has oi_a and oi_b on
4088 * it, ospf_write runs and clears the packets
4089 * for both oi_a and oi_b. Removing them from
4090 * the on_write_q. After this thread of execution
4091 * finishes we will execute the t_write thread
4092 * with nothing in the on_write_q causing an
4093 * assert. So just make sure that the t_write
4094 * is actually turned off.
4096 if (list_isempty(oi
->ospf
->oi_write_q
))
4097 THREAD_OFF(oi
->ospf
->t_write
);
4099 /* Hook thread to write packet. */
4100 OSPF_ISM_WRITE_ON(oi
->ospf
);
4104 static void ospf_ls_upd_send_queue_event(struct thread
*thread
)
4106 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4107 struct route_node
*rn
;
4108 struct route_node
*rnext
;
4109 struct list
*update
;
4112 oi
->t_ls_upd_event
= NULL
;
4114 if (IS_DEBUG_OSPF_EVENT
)
4115 zlog_debug("ospf_ls_upd_send_queue start");
4117 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4118 rnext
= route_next(rn
);
4120 if (rn
->info
== NULL
)
4123 update
= (struct list
*)rn
->info
;
4125 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4127 /* list might not be empty. */
4128 if (listcount(update
) == 0) {
4129 list_delete((struct list
**)&rn
->info
);
4130 route_unlock_node(rn
);
4136 if (IS_DEBUG_OSPF_EVENT
)
4138 "ospf_ls_upd_send_queue: update lists not cleared, %d nodes to try again, raising new event",
4140 oi
->t_ls_upd_event
= NULL
;
4141 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4142 &oi
->t_ls_upd_event
);
4145 if (IS_DEBUG_OSPF_EVENT
)
4146 zlog_debug("ospf_ls_upd_send_queue stop");
4149 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4152 struct ospf_interface
*oi
;
4153 struct ospf_lsa
*lsa
;
4154 struct prefix_ipv4 p
;
4155 struct route_node
*rn
;
4156 struct listnode
*node
;
4161 p
.prefixlen
= IPV4_MAX_BITLEN
;
4163 /* Decide destination address. */
4164 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4165 p
.prefix
= oi
->vl_data
->peer_addr
;
4166 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4167 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4168 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4169 p
.prefix
= nbr
->address
.u
.prefix4
;
4170 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4171 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4172 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4173 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4175 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4177 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4178 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4181 "* LS-Update is directly sent on NBMA network.");
4182 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4183 flog_warn(EC_OSPF_PACKET
,
4184 "* LS-Update is sent to myself.");
4187 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4189 if (rn
->info
== NULL
)
4190 rn
->info
= list_new();
4192 route_unlock_node(rn
);
4194 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4195 listnode_add(rn
->info
,
4196 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4197 if (send_lsupd_now
) {
4198 struct list
*send_update_list
;
4199 struct route_node
*rnext
;
4201 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4202 rnext
= route_next(rn
);
4204 if (rn
->info
== NULL
)
4207 send_update_list
= (struct list
*)rn
->info
;
4209 ospf_ls_upd_queue_send(oi
, send_update_list
,
4210 rn
->p
.u
.prefix4
, 1);
4213 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4214 &oi
->t_ls_upd_event
);
4217 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4220 struct ospf_packet
*op
;
4221 uint16_t length
= OSPF_HEADER_SIZE
;
4223 op
= ospf_packet_new(oi
->ifp
->mtu
);
4225 /* Prepare OSPF common header. */
4226 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4228 /* Prepare OSPF Link State Acknowledgment body. */
4229 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4231 /* Fill OSPF header. */
4232 ospf_fill_header(oi
, op
->s
, length
);
4234 /* Set packet length. */
4235 op
->length
= length
;
4237 /* Decide destination address. */
4238 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4239 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4241 op
->dst
.s_addr
= dst
.s_addr
;
4243 /* Add packet to the interface output queue. */
4244 ospf_packet_add(oi
, op
);
4246 /* Hook thread to write packet. */
4247 OSPF_ISM_WRITE_ON(oi
->ospf
);
4250 static void ospf_ls_ack_send_event(struct thread
*thread
)
4252 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4254 oi
->t_ls_ack_direct
= NULL
;
4256 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4257 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4258 oi
->ls_ack_direct
.dst
);
4261 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4263 struct ospf_interface
*oi
= nbr
->oi
;
4265 if (IS_GRACE_LSA(lsa
)) {
4266 if (IS_DEBUG_OSPF_GR
)
4267 zlog_debug("%s, Sending GRACE ACK to Restarter.",
4271 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4272 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4274 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4276 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4277 &oi
->t_ls_ack_direct
);
4280 /* Send Link State Acknowledgment delayed. */
4281 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4285 /* Decide destination address. */
4286 /* RFC2328 Section 13.5 On non-broadcast
4287 networks, delayed Link State Acknowledgment packets must be
4288 unicast separately over each adjacency (i.e., neighbor whose
4289 state is >= Exchange). */
4290 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4291 struct ospf_neighbor
*nbr
;
4292 struct route_node
*rn
;
4294 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4295 if ((nbr
= rn
->info
) != NULL
)
4296 if (nbr
!= oi
->nbr_self
4297 && nbr
->state
>= NSM_Exchange
)
4298 while (listcount(oi
->ls_ack
))
4299 ospf_ls_ack_send_list(
4301 nbr
->address
.u
.prefix4
);
4304 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4305 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4306 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4307 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4308 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4309 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4310 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4311 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4313 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4315 while (listcount(oi
->ls_ack
))
4316 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4320 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4321 * address. As a result, the kernel does not need to learn the interface
4322 * MAC of the OSPF neighbor. However, in our world, this will delay
4323 * convergence. Take the case when due to a link flap, all routes now
4324 * want to use an interface which was deemed to be costlier prior to this
4325 * event. For routes that will be installed, the missing MAC will have
4326 * punt-to-CPU set on them. This may overload the CPU control path that
4327 * can be avoided if the MAC was known apriori.
4329 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4331 if (!nbr
|| !nbr
->oi
->ospf
->proactive_arp
)
4334 ospf_zebra_send_arp(nbr
->oi
->ifp
, &nbr
->address
);