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"
38 #include "lib_errors.h"
40 #include "ospfd/ospfd.h"
41 #include "ospfd/ospf_network.h"
42 #include "ospfd/ospf_interface.h"
43 #include "ospfd/ospf_ism.h"
44 #include "ospfd/ospf_asbr.h"
45 #include "ospfd/ospf_lsa.h"
46 #include "ospfd/ospf_lsdb.h"
47 #include "ospfd/ospf_neighbor.h"
48 #include "ospfd/ospf_nsm.h"
49 #include "ospfd/ospf_packet.h"
50 #include "ospfd/ospf_spf.h"
51 #include "ospfd/ospf_flood.h"
52 #include "ospfd/ospf_dump.h"
53 #include "ospfd/ospf_errors.h"
56 * OSPF Fragmentation / fragmented writes
58 * ospfd can support writing fragmented packets, for cases where
59 * kernel will not fragment IP_HDRINCL and/or multicast destined
60 * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However,
61 * SunOS, probably BSD too, clobber the user supplied IP ID and IP
62 * flags fields, hence user-space fragmentation will not work.
63 * Only Linux is known to leave IP header unmolested.
64 * Further, fragmentation really should be done the kernel, which already
65 * supports it, and which avoids nasty IP ID state problems.
67 * Fragmentation of OSPF packets can be required on networks with router
68 * with many many interfaces active in one area, or on networks with links
72 #define WANT_OSPF_WRITE_FRAGMENT
75 /* Packet Type String. */
76 const struct message ospf_packet_type_str
[] = {
77 {OSPF_MSG_HELLO
, "Hello"},
78 {OSPF_MSG_DB_DESC
, "Database Description"},
79 {OSPF_MSG_LS_REQ
, "Link State Request"},
80 {OSPF_MSG_LS_UPD
, "Link State Update"},
81 {OSPF_MSG_LS_ACK
, "Link State Acknowledgment"},
84 /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of
85 particular types, offset is the "type" field of a packet. */
86 static const uint16_t ospf_packet_minlen
[] = {
89 OSPF_DB_DESC_MIN_SIZE
,
95 /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular
96 types, offset is the "LSA type" field. */
97 static const uint16_t ospf_lsa_minlen
[] = {
99 OSPF_ROUTER_LSA_MIN_SIZE
,
100 OSPF_NETWORK_LSA_MIN_SIZE
,
101 OSPF_SUMMARY_LSA_MIN_SIZE
,
102 OSPF_SUMMARY_LSA_MIN_SIZE
,
103 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
105 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
112 /* for ospf_check_auth() */
113 static int ospf_check_sum(struct ospf_header
*);
115 /* OSPF authentication checking function */
116 static int ospf_auth_type(struct ospf_interface
*oi
)
120 if (OSPF_IF_PARAM(oi
, auth_type
) == OSPF_AUTH_NOTSET
)
121 auth_type
= oi
->area
->auth_type
;
123 auth_type
= OSPF_IF_PARAM(oi
, auth_type
);
125 /* Handle case where MD5 key list is not configured aka Cisco */
126 if (auth_type
== OSPF_AUTH_CRYPTOGRAPHIC
127 && list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
128 return OSPF_AUTH_NULL
;
133 struct ospf_packet
*ospf_packet_new(size_t size
)
135 struct ospf_packet
*new;
137 new = XCALLOC(MTYPE_OSPF_PACKET
, sizeof(struct ospf_packet
));
138 new->s
= stream_new(size
);
143 void ospf_packet_free(struct ospf_packet
*op
)
148 XFREE(MTYPE_OSPF_PACKET
, op
);
151 struct ospf_fifo
*ospf_fifo_new()
153 struct ospf_fifo
*new;
155 new = XCALLOC(MTYPE_OSPF_FIFO
, sizeof(struct ospf_fifo
));
159 /* Add new packet to fifo. */
160 void ospf_fifo_push(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
163 fifo
->tail
->next
= op
;
172 /* Add new packet to head of fifo. */
173 static void ospf_fifo_push_head(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
175 op
->next
= fifo
->head
;
177 if (fifo
->tail
== NULL
)
185 /* Delete first packet from fifo. */
186 struct ospf_packet
*ospf_fifo_pop(struct ospf_fifo
*fifo
)
188 struct ospf_packet
*op
;
193 fifo
->head
= op
->next
;
195 if (fifo
->head
== NULL
)
204 /* Return first fifo entry. */
205 struct ospf_packet
*ospf_fifo_head(struct ospf_fifo
*fifo
)
210 /* Flush ospf packet fifo. */
211 void ospf_fifo_flush(struct ospf_fifo
*fifo
)
213 struct ospf_packet
*op
;
214 struct ospf_packet
*next
;
216 for (op
= fifo
->head
; op
; op
= next
) {
218 ospf_packet_free(op
);
220 fifo
->head
= fifo
->tail
= NULL
;
224 /* Free ospf packet fifo. */
225 void ospf_fifo_free(struct ospf_fifo
*fifo
)
227 ospf_fifo_flush(fifo
);
229 XFREE(MTYPE_OSPF_FIFO
, fifo
);
232 void ospf_packet_add(struct ospf_interface
*oi
, struct ospf_packet
*op
)
237 "ospf_packet_add(interface %s in state %d [%s], packet type %s, "
238 "destination %s) called with NULL obuf, ignoring "
239 "(please report this bug)!\n",
240 IF_NAME(oi
), oi
->state
,
241 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
),
242 lookup_msg(ospf_packet_type_str
,
243 stream_getc_from(op
->s
, 1), NULL
),
248 /* Add packet to end of queue. */
249 ospf_fifo_push(oi
->obuf
, op
);
251 /* Debug of packet fifo*/
252 /* ospf_fifo_debug (oi->obuf); */
255 static void ospf_packet_add_top(struct ospf_interface
*oi
,
256 struct ospf_packet
*op
)
261 "ospf_packet_add(interface %s in state %d [%s], packet type %s, "
262 "destination %s) called with NULL obuf, ignoring "
263 "(please report this bug)!\n",
264 IF_NAME(oi
), oi
->state
,
265 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
),
266 lookup_msg(ospf_packet_type_str
,
267 stream_getc_from(op
->s
, 1), NULL
),
272 /* Add packet to head of queue. */
273 ospf_fifo_push_head(oi
->obuf
, op
);
275 /* Debug of packet fifo*/
276 /* ospf_fifo_debug (oi->obuf); */
279 void ospf_packet_delete(struct ospf_interface
*oi
)
281 struct ospf_packet
*op
;
283 op
= ospf_fifo_pop(oi
->obuf
);
286 ospf_packet_free(op
);
289 struct ospf_packet
*ospf_packet_dup(struct ospf_packet
*op
)
291 struct ospf_packet
*new;
293 if (stream_get_endp(op
->s
) != op
->length
)
296 "ospf_packet_dup stream %lu ospf_packet %u size mismatch",
297 (unsigned long)STREAM_SIZE(op
->s
), op
->length
);
299 /* Reserve space for MD5 authentication that may be added later. */
300 new = ospf_packet_new(stream_get_endp(op
->s
) + OSPF_AUTH_MD5_SIZE
);
301 stream_copy(new->s
, op
->s
);
304 new->length
= op
->length
;
310 static unsigned int ospf_packet_authspace(struct ospf_interface
*oi
)
314 if (ospf_auth_type(oi
) == OSPF_AUTH_CRYPTOGRAPHIC
)
315 auth
= OSPF_AUTH_MD5_SIZE
;
320 static unsigned int ospf_packet_max(struct ospf_interface
*oi
)
324 max
= oi
->ifp
->mtu
- ospf_packet_authspace(oi
);
326 max
-= (OSPF_HEADER_SIZE
+ sizeof(struct ip
));
332 static int ospf_check_md5_digest(struct ospf_interface
*oi
,
333 struct ospf_header
*ospfh
)
336 unsigned char digest
[OSPF_AUTH_MD5_SIZE
];
337 struct crypt_key
*ck
;
338 struct ospf_neighbor
*nbr
;
339 uint16_t length
= ntohs(ospfh
->length
);
341 /* Get secret key. */
342 ck
= ospf_crypt_key_lookup(OSPF_IF_PARAM(oi
, auth_crypt
),
343 ospfh
->u
.crypt
.key_id
);
345 flog_warn(EC_OSPF_MD5
, "interface %s: ospf_check_md5 no key %d",
346 IF_NAME(oi
), ospfh
->u
.crypt
.key_id
);
350 /* check crypto seqnum. */
351 nbr
= ospf_nbr_lookup_by_routerid(oi
->nbrs
, &ospfh
->router_id
);
354 && ntohl(nbr
->crypt_seqnum
) > ntohl(ospfh
->u
.crypt
.crypt_seqnum
)) {
357 "interface %s: ospf_check_md5 bad sequence %d (expect %d)",
358 IF_NAME(oi
), ntohl(ospfh
->u
.crypt
.crypt_seqnum
),
359 ntohl(nbr
->crypt_seqnum
));
363 /* Generate a digest for the ospf packet - their digest + our digest. */
364 memset(&ctx
, 0, sizeof(ctx
));
366 MD5Update(&ctx
, ospfh
, length
);
367 MD5Update(&ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
368 MD5Final(digest
, &ctx
);
370 /* compare the two */
371 if (memcmp((caddr_t
)ospfh
+ length
, digest
, OSPF_AUTH_MD5_SIZE
)) {
372 flog_warn(EC_OSPF_MD5
,
373 "interface %s: ospf_check_md5 checksum mismatch",
378 /* save neighbor's crypt_seqnum */
380 nbr
->crypt_seqnum
= ospfh
->u
.crypt
.crypt_seqnum
;
384 /* This function is called from ospf_write(), it will detect the
385 authentication scheme and if it is MD5, it will change the sequence
386 and update the MD5 digest. */
387 static int ospf_make_md5_digest(struct ospf_interface
*oi
,
388 struct ospf_packet
*op
)
390 struct ospf_header
*ospfh
;
391 unsigned char digest
[OSPF_AUTH_MD5_SIZE
] = {0};
395 struct crypt_key
*ck
;
396 const uint8_t *auth_key
;
398 ibuf
= STREAM_DATA(op
->s
);
399 ospfh
= (struct ospf_header
*)ibuf
;
401 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
404 /* We do this here so when we dup a packet, we don't have to
405 waste CPU rewriting other headers.
407 Note that quagga_time /deliberately/ is not used here */
408 t
= (time(NULL
) & 0xFFFFFFFF);
409 if (t
> oi
->crypt_seqnum
)
410 oi
->crypt_seqnum
= t
;
414 ospfh
->u
.crypt
.crypt_seqnum
= htonl(oi
->crypt_seqnum
);
416 /* Get MD5 Authentication key from auth_key list. */
417 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
418 auth_key
= (const uint8_t *)digest
;
420 ck
= listgetdata(listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
421 auth_key
= ck
->auth_key
;
424 /* Generate a digest for the entire packet + our secret key. */
425 memset(&ctx
, 0, sizeof(ctx
));
427 MD5Update(&ctx
, ibuf
, ntohs(ospfh
->length
));
428 MD5Update(&ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
429 MD5Final(digest
, &ctx
);
431 /* Append md5 digest to the end of the stream. */
432 stream_put(op
->s
, digest
, OSPF_AUTH_MD5_SIZE
);
434 /* We do *NOT* increment the OSPF header length. */
435 op
->length
= ntohs(ospfh
->length
) + OSPF_AUTH_MD5_SIZE
;
437 if (stream_get_endp(op
->s
) != op
->length
)
441 "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u",
442 (unsigned long)stream_get_endp(op
->s
), op
->length
);
444 return OSPF_AUTH_MD5_SIZE
;
448 static int ospf_ls_req_timer(struct thread
*thread
)
450 struct ospf_neighbor
*nbr
;
452 nbr
= THREAD_ARG(thread
);
453 nbr
->t_ls_req
= NULL
;
455 /* Send Link State Request. */
456 if (ospf_ls_request_count(nbr
))
457 ospf_ls_req_send(nbr
);
459 /* Set Link State Request retransmission timer. */
460 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
465 void ospf_ls_req_event(struct ospf_neighbor
*nbr
)
468 thread_cancel(nbr
->t_ls_req
);
469 nbr
->t_ls_req
= NULL
;
471 nbr
->t_ls_req
= NULL
;
472 thread_add_event(master
, ospf_ls_req_timer
, nbr
, 0, &nbr
->t_ls_req
);
475 /* Cyclic timer function. Fist registered in ospf_nbr_new () in
477 int ospf_ls_upd_timer(struct thread
*thread
)
479 struct ospf_neighbor
*nbr
;
481 nbr
= THREAD_ARG(thread
);
482 nbr
->t_ls_upd
= NULL
;
484 /* Send Link State Update. */
485 if (ospf_ls_retransmit_count(nbr
) > 0) {
487 struct ospf_lsdb
*lsdb
;
489 int retransmit_interval
;
491 retransmit_interval
=
492 OSPF_IF_PARAM(nbr
->oi
, retransmit_interval
);
494 lsdb
= &nbr
->ls_rxmt
;
497 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
498 struct route_table
*table
= lsdb
->type
[i
].db
;
499 struct route_node
*rn
;
501 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
502 struct ospf_lsa
*lsa
;
504 if ((lsa
= rn
->info
) != NULL
) {
505 /* Don't retransmit an LSA if we
507 the last RxmtInterval seconds - this
509 neighbour a chance to acknowledge the
511 have ben just received before the
513 fired. This is a small tweak to what
515 but it will cut out out a lot of
518 if (monotime_since(&lsa
->tv_recv
, NULL
)
519 >= retransmit_interval
* 1000000LL)
520 listnode_add(update
, rn
->info
);
525 if (listcount(update
) > 0)
526 ospf_ls_upd_send(nbr
, update
, OSPF_SEND_PACKET_DIRECT
,
528 list_delete(&update
);
531 /* Set LS Update retransmission timer. */
532 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
, nbr
->v_ls_upd
);
537 int ospf_ls_ack_timer(struct thread
*thread
)
539 struct ospf_interface
*oi
;
541 oi
= THREAD_ARG(thread
);
544 /* Send Link State Acknowledgment. */
545 if (listcount(oi
->ls_ack
) > 0)
546 ospf_ls_ack_send_delayed(oi
);
548 /* Set LS Ack timer. */
549 OSPF_ISM_TIMER_ON(oi
->t_ls_ack
, ospf_ls_ack_timer
, oi
->v_ls_ack
);
554 #ifdef WANT_OSPF_WRITE_FRAGMENT
555 static void ospf_write_frags(int fd
, struct ospf_packet
*op
, struct ip
*iph
,
556 struct msghdr
*msg
, unsigned int maxdatasize
,
557 unsigned int mtu
, int flags
, uint8_t type
)
559 #define OSPF_WRITE_FRAG_SHIFT 3
564 assert(op
->length
== stream_get_endp(op
->s
));
565 assert(msg
->msg_iovlen
== 2);
569 * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
570 * well as the IP_MF flag, making this all quite pointless.
572 * However, for a system on which IP_MF is left alone, and ip_id left
573 * alone or else which sets same ip_id for each fragment this might
576 * XXX-TODO: It would be much nicer to have the kernel's use their
577 * existing fragmentation support to do this for us. Bugs/RFEs need to
578 * be raised against the various kernels.
582 iph
->ip_off
|= IP_MF
;
584 /* ip frag offset is expressed in units of 8byte words */
585 offset
= maxdatasize
>> OSPF_WRITE_FRAG_SHIFT
;
587 iovp
= &msg
->msg_iov
[1];
589 while ((stream_get_endp(op
->s
) - stream_get_getp(op
->s
))
591 /* data length of this frag is to next offset value */
592 iovp
->iov_len
= offset
<< OSPF_WRITE_FRAG_SHIFT
;
593 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
594 assert(iph
->ip_len
<= mtu
);
596 sockopt_iphdrincl_swab_htosys(iph
);
598 ret
= sendmsg(fd
, msg
, flags
);
600 sockopt_iphdrincl_swab_systoh(iph
);
605 "*** ospf_write_frags: sendmsg failed to %s,"
606 " id %d, off %d, len %d, mtu %u failed with %s",
607 inet_ntoa(iph
->ip_dst
), iph
->ip_id
, iph
->ip_off
,
608 iph
->ip_len
, mtu
, safe_strerror(errno
));
610 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
612 "ospf_write_frags: sent id %d, off %d, len %d to %s\n",
613 iph
->ip_id
, iph
->ip_off
, iph
->ip_len
,
614 inet_ntoa(iph
->ip_dst
));
615 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
617 "-----------------IP Header Dump----------------------");
618 ospf_ip_header_dump(iph
);
620 "-----------------------------------------------------");
624 iph
->ip_off
+= offset
;
625 stream_forward_getp(op
->s
, iovp
->iov_len
);
626 iovp
->iov_base
= stream_pnt(op
->s
);
629 /* setup for final fragment */
630 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
631 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
632 iph
->ip_off
&= (~IP_MF
);
634 #endif /* WANT_OSPF_WRITE_FRAGMENT */
636 static int ospf_write(struct thread
*thread
)
638 struct ospf
*ospf
= THREAD_ARG(thread
);
639 struct ospf_interface
*oi
;
640 struct ospf_interface
*last_serviced_oi
= NULL
;
641 struct ospf_packet
*op
;
642 struct sockaddr_in sa_dst
;
649 struct listnode
*node
;
650 #ifdef WANT_OSPF_WRITE_FRAGMENT
651 static uint16_t ipid
= 0;
652 uint16_t maxdatasize
;
653 #endif /* WANT_OSPF_WRITE_FRAGMENT */
654 #define OSPF_WRITE_IPHL_SHIFT 2
658 unsigned char cmsgbuf
[64] = {0};
659 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
660 struct in_pktinfo
*pi
;
663 ospf
->t_write
= NULL
;
665 node
= listhead(ospf
->oi_write_q
);
667 oi
= listgetdata(node
);
670 #ifdef WANT_OSPF_WRITE_FRAGMENT
671 /* seed ipid static with low order bits of time */
673 ipid
= (time(NULL
) & 0xffff);
674 #endif /* WANT_OSPF_WRITE_FRAGMENT */
676 while ((pkt_count
< ospf
->write_oi_count
) && oi
677 && (last_serviced_oi
!= oi
)) {
678 /* If there is only packet in the queue, the oi is removed from
679 write-q, so fix up the last interface that was serviced */
680 if (last_serviced_oi
== NULL
) {
681 last_serviced_oi
= oi
;
684 #ifdef WANT_OSPF_WRITE_FRAGMENT
685 /* convenience - max OSPF data per packet */
686 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
687 #endif /* WANT_OSPF_WRITE_FRAGMENT */
688 /* Get one packet from queue. */
689 op
= ospf_fifo_head(oi
->obuf
);
691 assert(op
->length
>= OSPF_HEADER_SIZE
);
693 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
694 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
695 ospf_if_ipmulticast(ospf
, oi
->address
,
698 /* Rewrite the md5 signature & update the seq */
699 ospf_make_md5_digest(oi
, op
);
701 /* Retrieve OSPF packet type. */
702 stream_set_getp(op
->s
, 1);
703 type
= stream_getc(op
->s
);
705 /* reset get pointer */
706 stream_set_getp(op
->s
, 0);
708 memset(&iph
, 0, sizeof(struct ip
));
709 memset(&sa_dst
, 0, sizeof(sa_dst
));
711 sa_dst
.sin_family
= AF_INET
;
712 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
713 sa_dst
.sin_len
= sizeof(sa_dst
);
714 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
715 sa_dst
.sin_addr
= op
->dst
;
716 sa_dst
.sin_port
= htons(0);
718 /* Set DONTROUTE flag if dst is unicast. */
719 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
720 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
721 flags
= MSG_DONTROUTE
;
723 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
724 /* it'd be very strange for header to not be 4byte-word aligned
726 if (sizeof(struct ip
)
727 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
728 iph
.ip_hl
++; /* we presume sizeof struct ip cant
731 iph
.ip_v
= IPVERSION
;
732 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
733 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
735 #if defined(__DragonFly__)
737 * DragonFly's raw socket expects ip_len/ip_off in network byte
740 iph
.ip_len
= htons(iph
.ip_len
);
743 #ifdef WANT_OSPF_WRITE_FRAGMENT
744 /* XXX-MT: not thread-safe at all..
745 * XXX: this presumes this is only programme sending OSPF
747 * otherwise, no guarantee ipid will be unique
750 #endif /* WANT_OSPF_WRITE_FRAGMENT */
753 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
754 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
756 iph
.ip_ttl
= OSPF_IP_TTL
;
757 iph
.ip_p
= IPPROTO_OSPFIGP
;
759 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
760 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
762 memset(&msg
, 0, sizeof(msg
));
763 msg
.msg_name
= (caddr_t
)&sa_dst
;
764 msg
.msg_namelen
= sizeof(sa_dst
);
768 iov
[0].iov_base
= (char *)&iph
;
769 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
770 iov
[1].iov_base
= stream_pnt(op
->s
);
771 iov
[1].iov_len
= op
->length
;
774 msg
.msg_control
= (caddr_t
)cm
;
775 cm
->cmsg_level
= SOL_IP
;
776 cm
->cmsg_type
= IP_PKTINFO
;
777 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
778 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
779 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
781 msg
.msg_controllen
= cm
->cmsg_len
;
784 /* Sadly we can not rely on kernels to fragment packets
785 * because of either IP_HDRINCL and/or multicast
786 * destination being set.
789 #ifdef WANT_OSPF_WRITE_FRAGMENT
790 if (op
->length
> maxdatasize
)
791 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
792 oi
->ifp
->mtu
, flags
, type
);
793 #endif /* WANT_OSPF_WRITE_FRAGMENT */
795 /* send final fragment (could be first) */
796 sockopt_iphdrincl_swab_htosys(&iph
);
797 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
798 sockopt_iphdrincl_swab_systoh(&iph
);
799 if (IS_DEBUG_OSPF_EVENT
)
802 "id %d, off %d, len %d, interface %s, mtu %u:",
803 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
804 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
809 "*** sendmsg in ospf_write failed to %s, "
810 "id %d, off %d, len %d, interface %s, mtu %u: %s",
811 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
812 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
813 safe_strerror(errno
));
815 /* Show debug sending packet. */
816 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
817 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
819 "-----------------------------------------------------");
820 ospf_ip_header_dump(&iph
);
821 stream_set_getp(op
->s
, 0);
822 ospf_packet_dump(op
->s
);
825 zlog_debug("%s sent to [%s] via [%s].",
826 lookup_msg(ospf_packet_type_str
, type
, NULL
),
827 inet_ntoa(op
->dst
), IF_NAME(oi
));
829 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
831 "-----------------------------------------------------");
838 case OSPF_MSG_DB_DESC
:
841 case OSPF_MSG_LS_REQ
:
844 case OSPF_MSG_LS_UPD
:
847 case OSPF_MSG_LS_ACK
:
854 /* Now delete packet from queue. */
855 ospf_packet_delete(oi
);
857 /* Move this interface to the tail of write_q to
858 serve everyone in a round robin fashion */
859 list_delete_node(ospf
->oi_write_q
, node
);
860 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
862 last_serviced_oi
= NULL
;
865 listnode_add(ospf
->oi_write_q
, oi
);
868 /* Setup to service from the head of the queue again */
869 if (!list_isempty(ospf
->oi_write_q
)) {
870 node
= listhead(ospf
->oi_write_q
);
872 oi
= listgetdata(node
);
877 /* If packets still remain in queue, call write thread. */
878 if (!list_isempty(ospf
->oi_write_q
))
879 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
885 /* OSPF Hello message read -- RFC2328 Section 10.5. */
886 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
887 struct stream
*s
, struct ospf_interface
*oi
, int size
)
889 struct ospf_hello
*hello
;
890 struct ospf_neighbor
*nbr
;
894 /* increment statistics. */
897 hello
= (struct ospf_hello
*)stream_pnt(s
);
899 /* If Hello is myself, silently discard. */
900 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
901 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
903 "ospf_header[%s/%s]: selforiginated, "
905 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
907 inet_ntoa(iph
->ip_src
));
912 /* get neighbor prefix. */
914 p
.prefixlen
= ip_masklen(hello
->network_mask
);
915 p
.u
.prefix4
= iph
->ip_src
;
917 /* Compare network mask. */
918 /* Checking is ignored for Point-to-Point and Virtual link. */
919 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
920 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
921 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
924 "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
925 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
),
926 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
930 /* Compare Router Dead Interval. */
931 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
932 flog_warn(EC_OSPF_PACKET
,
933 "Packet %s [Hello:RECV]: RouterDeadInterval mismatch "
934 "(expected %u, but received %u).",
935 inet_ntoa(ospfh
->router_id
),
936 OSPF_IF_PARAM(oi
, v_wait
),
937 ntohl(hello
->dead_interval
));
941 /* Compare Hello Interval - ignored if fast-hellos are set. */
942 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
943 if (OSPF_IF_PARAM(oi
, v_hello
)
944 != ntohs(hello
->hello_interval
)) {
947 "Packet %s [Hello:RECV]: HelloInterval mismatch "
948 "(expected %u, but received %u).",
949 inet_ntoa(ospfh
->router_id
),
950 OSPF_IF_PARAM(oi
, v_hello
),
951 ntohs(hello
->hello_interval
));
956 if (IS_DEBUG_OSPF_EVENT
)
957 zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s",
958 inet_ntoa(ospfh
->router_id
),
959 ospf_options_dump(hello
->options
),
960 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
962 /* Compare options. */
963 #define REJECT_IF_TBIT_ON 1 /* XXX */
964 #ifdef REJECT_IF_TBIT_ON
965 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
967 * This router does not support non-zero TOS.
968 * Drop this Hello packet not to establish neighbor
971 flog_warn(EC_OSPF_PACKET
,
972 "Packet %s [Hello:RECV]: T-bit on, drop it.",
973 inet_ntoa(ospfh
->router_id
));
976 #endif /* REJECT_IF_TBIT_ON */
978 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
979 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
981 * This router does know the correct usage of O-bit
982 * the bit should be set in DD packet only.
984 flog_warn(EC_OSPF_PACKET
,
985 "Packet %s [Hello:RECV]: O-bit abuse?",
986 inet_ntoa(ospfh
->router_id
));
987 #ifdef STRICT_OBIT_USAGE_CHECK
988 return; /* Reject this packet. */
989 #else /* STRICT_OBIT_USAGE_CHECK */
990 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
991 #endif /* STRICT_OBIT_USAGE_CHECK */
994 /* new for NSSA is to ensure that NP is on and E is off */
996 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
997 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
998 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
999 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1000 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
1003 "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x",
1004 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1008 if (IS_DEBUG_OSPF_NSSA
)
1009 zlog_debug("NSSA-Hello:RECV:Packet from %s:",
1010 inet_ntoa(ospfh
->router_id
));
1012 /* The setting of the E-bit found in the Hello Packet's Options
1013 field must match this area's ExternalRoutingCapability A
1014 mismatch causes processing to stop and the packet to be
1015 dropped. The setting of the rest of the bits in the Hello
1016 Packet's Options field should be ignored. */
1017 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1018 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1021 "Packet %s [Hello:RECV]: my options: %x, his options %x",
1022 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1027 /* get neighbour struct */
1028 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1030 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1033 old_state
= nbr
->state
;
1035 /* Add event to thread. */
1036 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1038 /* RFC2328 Section 9.5.1
1039 If the router is not eligible to become Designated Router,
1040 (snip) It must also send an Hello Packet in reply to an
1041 Hello Packet received from any eligible neighbor (other than
1042 the current Designated Router and Backup Designated Router). */
1043 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1044 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1045 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1046 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1047 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1048 ospf_hello_reply_timer
,
1049 OSPF_HELLO_REPLY_DELAY
);
1051 /* on NBMA network type, it happens to receive bidirectional Hello
1053 without advance 1-Way Received event.
1054 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1055 if (oi
->type
== OSPF_IFTYPE_NBMA
1056 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1057 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1058 nbr
->priority
= hello
->priority
;
1059 nbr
->d_router
= hello
->d_router
;
1060 nbr
->bd_router
= hello
->bd_router
;
1064 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1065 size
- OSPF_HELLO_MIN_SIZE
)) {
1066 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1067 nbr
->options
|= hello
->options
;
1069 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1070 /* Set neighbor information. */
1071 nbr
->priority
= hello
->priority
;
1072 nbr
->d_router
= hello
->d_router
;
1073 nbr
->bd_router
= hello
->bd_router
;
1077 /* If neighbor itself declares DR and no BDR exists,
1078 cause event BackupSeen */
1079 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1080 if (hello
->bd_router
.s_addr
== 0 && oi
->state
== ISM_Waiting
)
1081 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1083 /* neighbor itself declares BDR. */
1084 if (oi
->state
== ISM_Waiting
1085 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
))
1086 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1088 /* had not previously. */
1089 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1090 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1091 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1092 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->d_router
)))
1093 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1095 /* had not previously. */
1096 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1097 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1098 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1099 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
)))
1100 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1102 /* Neighbor priority check. */
1103 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1104 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1106 /* Set neighbor information. */
1107 nbr
->priority
= hello
->priority
;
1108 nbr
->d_router
= hello
->d_router
;
1109 nbr
->bd_router
= hello
->bd_router
;
1112 /* Save DD flags/options/Seqnum received. */
1113 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1114 struct ospf_db_desc
*dd
)
1116 nbr
->last_recv
.flags
= dd
->flags
;
1117 nbr
->last_recv
.options
= dd
->options
;
1118 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1121 /* Process rest of DD packet. */
1122 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1123 struct ospf_neighbor
*nbr
,
1124 struct ospf_db_desc
*dd
, uint16_t size
)
1126 struct ospf_lsa
*new, *find
;
1127 struct lsa_header
*lsah
;
1129 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1130 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1131 size
-= OSPF_LSA_HEADER_SIZE
) {
1132 lsah
= (struct lsa_header
*)stream_pnt(s
);
1133 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1135 /* Unknown LS type. */
1136 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1137 flog_warn(EC_OSPF_PACKET
,
1138 "Packet [DD:RECV]: Unknown LS type %d.",
1140 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1144 if (IS_OPAQUE_LSA(lsah
->type
)
1145 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1146 flog_warn(EC_OSPF_PACKET
,
1147 "LSA[Type%d:%s]: Opaque capability mismatch?",
1148 lsah
->type
, inet_ntoa(lsah
->id
));
1149 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1153 switch (lsah
->type
) {
1154 case OSPF_AS_EXTERNAL_LSA
:
1155 case OSPF_OPAQUE_AS_LSA
:
1156 /* Check for stub area. Reject if AS-External from stub
1158 allow if from NSSA. */
1159 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1162 "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.",
1163 lsah
->type
, inet_ntoa(lsah
->id
),
1164 (oi
->area
->external_routing
1168 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1169 NSM_SeqNumberMismatch
);
1177 /* Create LS-request object. */
1178 new = ospf_ls_request_new(lsah
);
1180 /* Lookup received LSA, then add LS request list. */
1181 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1183 /* ospf_lsa_more_recent is fine with NULL pointers */
1184 switch (ospf_lsa_more_recent(find
, new)) {
1186 /* Neighbour has a more recent LSA, we must request it
1188 ospf_ls_request_add(nbr
, new);
1191 /* If we have a copy of this LSA, it's either less
1193 * and we're requesting it from neighbour (the case
1195 * it's as recent and we both have same copy (this
1198 * In neither of these two cases is there any point in
1199 * describing our copy of the LSA to the neighbour in a
1200 * DB-Summary packet, if we're still intending to do so.
1202 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1203 * backward compatible optimisation to OSPF DB Exchange
1205 * DB Description process implemented here.
1208 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1209 ospf_lsa_discard(new);
1212 /* We have the more recent copy, nothing specific to do:
1213 * - no need to request neighbours stale copy
1214 * - must leave DB summary list copy alone
1216 if (IS_DEBUG_OSPF_EVENT
)
1218 "Packet [DD:RECV]: LSA received Type %d, "
1219 "ID %s is not recent.",
1220 lsah
->type
, inet_ntoa(lsah
->id
));
1221 ospf_lsa_discard(new);
1226 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1229 /* Both sides have no More, then we're done with Exchange */
1230 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1231 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1233 ospf_db_desc_send(nbr
);
1237 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1239 /* Send DD packet in reply.
1241 * Must be done to acknowledge the Master's DD, regardless of
1242 * whether we have more LSAs ourselves to describe.
1244 * This function will clear the 'More' bit, if after this DD
1245 * we have no more LSAs to describe to the master..
1247 ospf_db_desc_send(nbr
);
1249 /* Slave can raise ExchangeDone now, if master is also done */
1250 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1251 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1254 /* Save received neighbor values from DD. */
1255 ospf_db_desc_save_current(nbr
, dd
);
1258 ospf_ls_req_send(nbr
);
1261 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1262 struct ospf_neighbor
*nbr
)
1264 /* Is DD duplicated? */
1265 if (dd
->options
== nbr
->last_recv
.options
1266 && dd
->flags
== nbr
->last_recv
.flags
1267 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1273 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1274 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1275 struct stream
*s
, struct ospf_interface
*oi
,
1278 struct ospf_db_desc
*dd
;
1279 struct ospf_neighbor
*nbr
;
1281 /* Increment statistics. */
1284 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1286 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1288 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Unknown Neighbor %s",
1289 inet_ntoa(ospfh
->router_id
));
1294 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1295 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1298 "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u",
1299 inet_ntoa(nbr
->router_id
), ntohs(dd
->mtu
), IF_NAME(oi
),
1305 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1307 * required. In fact at least JunOS sends DD packets with P bit clear.
1308 * Until proper solution is developped, this hack should help.
1310 * Update: According to the RFCs, N bit is specified /only/ for Hello
1311 * options, unfortunately its use in DD options is not specified. Hence
1313 * implementations follow E-bit semantics and set it in DD options, and
1315 * treat it as unspecified and hence follow the directive "default for
1316 * options is clear", ie unset.
1318 * Reset the flag, as ospfd follows E-bit semantics.
1320 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1321 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1322 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1323 if (IS_DEBUG_OSPF_EVENT
)
1325 "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options",
1326 inet_ntoa(nbr
->router_id
));
1327 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1330 #ifdef REJECT_IF_TBIT_ON
1331 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1333 * In Hello protocol, optional capability must have checked
1334 * to prevent this T-bit enabled router be my neighbor.
1336 flog_warn(EC_OSPF_PACKET
, "Packet[DD]: Neighbor %s: T-bit on?",
1337 inet_ntoa(nbr
->router_id
));
1340 #endif /* REJECT_IF_TBIT_ON */
1342 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1343 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1345 * This node is not configured to handle O-bit, for now.
1346 * Clear it to ignore unsupported capability proposed by
1349 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1352 /* Add event to thread. */
1353 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1355 /* Process DD packet by neighbor status. */
1356 switch (nbr
->state
) {
1362 "Packet[DD]: Neighbor %s state is %s, packet discarded.",
1363 inet_ntoa(nbr
->router_id
),
1364 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1367 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1368 /* If the new state is ExStart, the processing of the current
1369 packet should then continue in this new state by falling
1370 through to case ExStart below. */
1371 if (nbr
->state
!= NSM_ExStart
)
1376 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1377 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1378 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1380 /* We're Slave---obey */
1381 if (CHECK_FLAG(oi
->ospf
->config
,
1382 OSPF_LOG_ADJACENCY_DETAIL
))
1384 "Packet[DD]: Neighbor %s Negotiation done (Slave).",
1385 inet_ntoa(nbr
->router_id
));
1387 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1390 UNSET_FLAG(nbr
->dd_flags
,
1391 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1393 /* We're Master, ignore the initial DBD from
1395 if (CHECK_FLAG(oi
->ospf
->config
,
1396 OSPF_LOG_ADJACENCY_DETAIL
))
1398 "Packet[DD]: Neighbor %s: Initial DBD from Slave, "
1400 inet_ntoa(nbr
->router_id
));
1404 /* Ack from the Slave */
1405 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1406 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1407 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1410 "Packet[DD]: Neighbor %s Negotiation done (Master).",
1411 inet_ntoa(nbr
->router_id
));
1412 /* Reset I, leaving MS */
1413 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1415 flog_warn(EC_OSPF_PACKET
,
1416 "Packet[DD]: Neighbor %s Negotiation fails.",
1417 inet_ntoa(nbr
->router_id
));
1421 /* This is where the real Options are saved */
1422 nbr
->options
= dd
->options
;
1424 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1425 if (IS_DEBUG_OSPF_EVENT
)
1427 "Neighbor[%s] is %sOpaque-capable.",
1428 inet_ntoa(nbr
->router_id
),
1429 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1433 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1434 && IPV4_ADDR_SAME(&DR(oi
),
1435 &nbr
->address
.u
.prefix4
)) {
1438 "DR-neighbor[%s] is NOT opaque-capable; Opaque-LSAs cannot be reliably advertised in this network.",
1439 inet_ntoa(nbr
->router_id
));
1440 /* This situation is undesirable, but not a real
1445 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1447 /* continue processing rest of packet. */
1448 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1451 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1452 if (IS_SET_DD_MS(nbr
->dd_flags
))
1453 /* Master: discard duplicated DD packet. */
1455 "Packet[DD] (Master): Neighbor %s packet duplicated.",
1456 inet_ntoa(nbr
->router_id
));
1458 /* Slave: cause to retransmit the last Database
1462 "Packet[DD] [Slave]: Neighbor %s packet duplicated.",
1463 inet_ntoa(nbr
->router_id
));
1464 ospf_db_desc_resend(nbr
);
1469 /* Otherwise DD packet should be checked. */
1470 /* Check Master/Slave bit mismatch */
1471 if (IS_SET_DD_MS(dd
->flags
)
1472 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1473 flog_warn(EC_OSPF_PACKET
,
1474 "Packet[DD]: Neighbor %s MS-bit mismatch.",
1475 inet_ntoa(nbr
->router_id
));
1476 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1477 if (IS_DEBUG_OSPF_EVENT
)
1479 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1480 dd
->flags
, nbr
->dd_flags
);
1484 /* Check initialize bit is set. */
1485 if (IS_SET_DD_I(dd
->flags
)) {
1486 zlog_info("Packet[DD]: Neighbor %s I-bit set.",
1487 inet_ntoa(nbr
->router_id
));
1488 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1492 /* Check DD Options. */
1493 if (dd
->options
!= nbr
->options
) {
1494 #ifdef ORIGINAL_CODING
1495 /* Save the new options for debugging */
1496 nbr
->options
= dd
->options
;
1497 #endif /* ORIGINAL_CODING */
1498 flog_warn(EC_OSPF_PACKET
,
1499 "Packet[DD]: Neighbor %s options mismatch.",
1500 inet_ntoa(nbr
->router_id
));
1501 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1505 /* Check DD sequence number. */
1506 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1507 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1508 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1509 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1512 "Packet[DD]: Neighbor %s sequence number mismatch.",
1513 inet_ntoa(nbr
->router_id
));
1514 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1518 /* Continue processing rest of packet. */
1519 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1523 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1524 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1525 /* Master should discard duplicate DD packet. */
1527 "Packet[DD]: Neighbor %s duplicated, "
1528 "packet discarded.",
1529 inet_ntoa(nbr
->router_id
));
1532 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1533 < nbr
->v_inactivity
* 1000000LL) {
1534 /* In states Loading and Full the slave
1536 its last Database Description packet
1538 duplicate Database Description
1540 from the master. For this reason the
1542 wait RouterDeadInterval seconds
1544 last Database Description packet.
1546 Database Description packet from the
1548 this interval will generate a
1550 neighbor event. RFC2328 Section 10.8
1552 ospf_db_desc_resend(nbr
);
1558 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1561 flog_warn(EC_OSPF_PACKET
,
1562 "Packet[DD]: Neighbor %s NSM illegal status %u.",
1563 inet_ntoa(nbr
->router_id
), nbr
->state
);
1568 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1570 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1571 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1572 struct stream
*s
, struct ospf_interface
*oi
,
1575 struct ospf_neighbor
*nbr
;
1577 struct in_addr ls_id
;
1578 struct in_addr adv_router
;
1579 struct ospf_lsa
*find
;
1580 struct list
*ls_upd
;
1581 unsigned int length
;
1583 /* Increment statistics. */
1586 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1588 flog_warn(EC_OSPF_PACKET
,
1589 "Link State Request: Unknown Neighbor %s.",
1590 inet_ntoa(ospfh
->router_id
));
1594 /* Add event to thread. */
1595 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1597 /* Neighbor State should be Exchange or later. */
1598 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1599 && nbr
->state
!= NSM_Full
) {
1602 "Link State Request received from %s: Neighbor state is %s, packet discarded.",
1603 inet_ntoa(ospfh
->router_id
),
1604 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1608 /* Send Link State Update for ALL requested LSAs. */
1609 ls_upd
= list_new();
1610 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1612 while (size
>= OSPF_LSA_KEY_SIZE
) {
1613 /* Get one slice of Link State Request. */
1614 ls_type
= stream_getl(s
);
1615 ls_id
.s_addr
= stream_get_ipv4(s
);
1616 adv_router
.s_addr
= stream_get_ipv4(s
);
1618 /* Verify LSA type. */
1619 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1620 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1621 list_delete(&ls_upd
);
1625 /* Search proper LSA in LSDB. */
1626 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1629 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1630 list_delete(&ls_upd
);
1634 /* Packet overflows MTU size, send immediately. */
1635 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1636 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1637 ospf_ls_upd_send(nbr
, ls_upd
,
1638 OSPF_SEND_PACKET_DIRECT
, 0);
1640 ospf_ls_upd_send(nbr
, ls_upd
,
1641 OSPF_SEND_PACKET_INDIRECT
, 0);
1643 /* Only remove list contents. Keep ls_upd. */
1644 list_delete_all_node(ls_upd
);
1646 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1649 /* Append LSA to update list. */
1650 listnode_add(ls_upd
, find
);
1651 length
+= ntohs(find
->data
->length
);
1653 size
-= OSPF_LSA_KEY_SIZE
;
1656 /* Send rest of Link State Update. */
1657 if (listcount(ls_upd
) > 0) {
1658 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1659 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1662 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1665 list_delete(&ls_upd
);
1667 list_delete(&ls_upd
);
1670 /* Get the list of LSAs from Link State Update packet.
1671 And process some validation -- RFC2328 Section 13. (1)-(2). */
1672 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1674 struct ospf_interface
*oi
, size_t size
)
1676 uint16_t count
, sum
;
1678 struct lsa_header
*lsah
;
1679 struct ospf_lsa
*lsa
;
1684 count
= stream_getl(s
);
1685 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1687 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1688 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1689 lsah
= (struct lsa_header
*)stream_pnt(s
);
1690 length
= ntohs(lsah
->length
);
1692 if (length
> size
) {
1695 "Link State Update: LSA length exceeds packet size.");
1699 /* Validate the LSA's LS checksum. */
1700 sum
= lsah
->checksum
;
1701 if (!ospf_lsa_checksum_valid(lsah
)) {
1702 /* (bug #685) more details in a one-line message make it
1704 * to identify problem source on the one hand and to
1706 * chance to compress repeated messages in syslog on the
1710 "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s",
1711 sum
, lsah
->checksum
, inet_ntoa(lsah
->id
),
1712 inet_ntoa(nbr
->src
), inet_ntoa(nbr
->router_id
),
1713 inet_ntoa(lsah
->adv_router
));
1717 /* Examine the LSA's LS type. */
1718 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1719 flog_warn(EC_OSPF_PACKET
,
1720 "Link State Update: Unknown LS type %d",
1726 * What if the received LSA's age is greater than MaxAge?
1727 * Treat it as a MaxAge case -- endo.
1729 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1730 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1732 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1733 #ifdef STRICT_OBIT_USAGE_CHECK
1734 if ((IS_OPAQUE_LSA(lsah
->type
)
1735 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1736 || (!IS_OPAQUE_LSA(lsah
->type
)
1737 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1739 * This neighbor must know the exact usage of
1741 * the bit will be set in Type-9,10,11 LSAs
1744 flog_warn(EC_OSPF_PACKET
,
1745 "LSA[Type%d:%s]: O-bit abuse?",
1746 lsah
->type
, inet_ntoa(lsah
->id
));
1749 #endif /* STRICT_OBIT_USAGE_CHECK */
1751 /* Do not take in AS External Opaque-LSAs if we are a
1753 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1754 && nbr
->oi
->area
->external_routing
1755 != OSPF_AREA_DEFAULT
) {
1756 if (IS_DEBUG_OSPF_EVENT
)
1758 "LSA[Type%d:%s]: We are a stub, don't take this LSA.",
1760 inet_ntoa(lsah
->id
));
1763 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1764 flog_warn(EC_OSPF_PACKET
,
1765 "LSA[Type%d:%s]: Opaque capability mismatch?",
1766 lsah
->type
, inet_ntoa(lsah
->id
));
1770 /* Create OSPF LSA instance. */
1771 lsa
= ospf_lsa_new_and_data(length
);
1773 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1774 /* We may wish to put some error checking if type NSSA comes in
1775 and area not in NSSA mode */
1776 switch (lsah
->type
) {
1777 case OSPF_AS_EXTERNAL_LSA
:
1778 case OSPF_OPAQUE_AS_LSA
:
1781 case OSPF_OPAQUE_LINK_LSA
:
1782 lsa
->oi
= oi
; /* Remember incoming interface for
1783 flooding control. */
1786 lsa
->area
= oi
->area
;
1790 memcpy(lsa
->data
, lsah
, length
);
1792 if (IS_DEBUG_OSPF_EVENT
)
1794 "LSA[Type%d:%s]: %p new LSA created with Link State Update",
1795 lsa
->data
->type
, inet_ntoa(lsa
->data
->id
),
1797 listnode_add(lsas
, lsa
);
1803 /* Cleanup Update list. */
1804 static void ospf_upd_list_clean(struct list
*lsas
)
1806 struct listnode
*node
, *nnode
;
1807 struct ospf_lsa
*lsa
;
1809 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1810 ospf_lsa_discard(lsa
);
1815 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1816 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1817 struct ospf_header
*ospfh
, struct stream
*s
,
1818 struct ospf_interface
*oi
, uint16_t size
)
1820 struct ospf_neighbor
*nbr
;
1822 struct listnode
*node
, *nnode
;
1823 struct ospf_lsa
*lsa
= NULL
;
1824 /* unsigned long ls_req_found = 0; */
1826 /* Dis-assemble the stream, update each entry, re-encapsulate for
1829 /* Increment statistics. */
1832 /* Check neighbor. */
1833 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1835 flog_warn(EC_OSPF_PACKET
,
1836 "Link State Update: Unknown Neighbor %s on int: %s",
1837 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
1841 /* Add event to thread. */
1842 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1844 /* Check neighbor state. */
1845 if (nbr
->state
< NSM_Exchange
) {
1846 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1848 "Link State Update: "
1849 "Neighbor[%s] state %s is less than Exchange",
1850 inet_ntoa(ospfh
->router_id
),
1851 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1856 /* Get list of LSAs from Link State Update packet. - Also perorms Stages
1857 * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
1860 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1864 #define DISCARD_LSA(L, N) \
1866 if (IS_DEBUG_OSPF_EVENT) \
1868 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1870 N, (void *)lsa, (int)lsa->data->type); \
1871 ospf_lsa_discard(L); \
1875 /* Process each LSA received in the one packet.
1877 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1878 * text below are from the steps in RFC 2328, Section 13.
1880 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1881 struct ospf_lsa
*ls_ret
, *current
;
1884 if (IS_DEBUG_OSPF_NSSA
) {
1885 char buf1
[INET_ADDRSTRLEN
];
1886 char buf2
[INET_ADDRSTRLEN
];
1887 char buf3
[INET_ADDRSTRLEN
];
1889 zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s",
1891 inet_ntop(AF_INET
, &ospfh
->router_id
, buf1
,
1893 inet_ntop(AF_INET
, &lsa
->data
->id
, buf2
,
1895 inet_ntop(AF_INET
, &lsa
->data
->adv_router
,
1896 buf3
, INET_ADDRSTRLEN
));
1899 listnode_delete(lsas
,
1900 lsa
); /* We don't need it in list anymore */
1902 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1905 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1907 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1910 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1913 /* Do take in Type-7's if we are an NSSA */
1915 /* If we are also an ABR, later translate them to a Type-5
1918 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1919 translate them to a separate Type-5 packet. */
1921 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1922 /* Reject from STUB or NSSA */
1923 if (nbr
->oi
->area
->external_routing
1924 != OSPF_AREA_DEFAULT
) {
1925 if (IS_DEBUG_OSPF_NSSA
)
1927 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1928 DISCARD_LSA(lsa
, 1);
1931 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1932 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1933 if (IS_DEBUG_OSPF_NSSA
)
1935 "Incoming NSSA LSA Discarded: Not NSSA Area");
1936 DISCARD_LSA(lsa
, 2);
1939 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1940 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1941 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1942 &lsa
->data
->adv_router
)) {
1943 char buf1
[INET_ADDRSTRLEN
];
1944 char buf2
[INET_ADDRSTRLEN
];
1945 char buf3
[INET_ADDRSTRLEN
];
1947 flog_err(EC_OSPF_ROUTER_LSA_MISMATCH
,
1948 "Incoming Router-LSA from %s with "
1949 "Adv-ID[%s] != LS-ID[%s]",
1950 inet_ntop(AF_INET
, &ospfh
->router_id
,
1951 buf1
, INET_ADDRSTRLEN
),
1952 inet_ntop(AF_INET
, &lsa
->data
->id
,
1953 buf2
, INET_ADDRSTRLEN
),
1955 &lsa
->data
->adv_router
, buf3
,
1958 EC_OSPF_DOMAIN_CORRUPT
,
1959 "OSPF domain compromised by attack or corruption. "
1960 "Verify correct operation of -ALL- OSPF routers.");
1961 DISCARD_LSA(lsa
, 0);
1964 /* Find the LSA in the current database. */
1966 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1968 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1970 no instance of the LSA in the router's link state database,
1971 and none of router's neighbors are in states Exchange or
1973 then take the following actions: */
1975 if (IS_LSA_MAXAGE(lsa
) && !current
1976 && ospf_check_nbr_status(oi
->ospf
)) {
1977 /* (4a) Response Link State Acknowledgment. */
1978 ospf_ls_ack_send(nbr
, lsa
);
1980 /* (4b) Discard LSA. */
1981 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1983 "Link State Update[%s]: LS age is equal to MaxAge.",
1986 DISCARD_LSA(lsa
, 3);
1989 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1990 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1991 &oi
->ospf
->router_id
)) {
1993 * Even if initial flushing seems to be completed, there
1995 * be a case that self-originated LSA with MaxAge still
1997 * in the routing domain.
1998 * Just send an LSAck message to cease retransmission.
2000 if (IS_LSA_MAXAGE(lsa
)) {
2001 zlog_info("LSA[%s]: Boomerang effect?",
2003 ospf_ls_ack_send(nbr
, lsa
);
2004 ospf_lsa_discard(lsa
);
2006 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
2007 ospf_opaque_lsa_refresh_schedule(
2013 * If an instance of self-originated Opaque-LSA is not
2015 * in the LSDB, there are some possible cases here.
2017 * 1) This node lost opaque-capability after restart.
2018 * 2) Else, a part of opaque-type is no more supported.
2019 * 3) Else, a part of opaque-id is no more supported.
2021 * Anyway, it is still this node's responsibility to
2023 * Otherwise, the LSA instance remains in the routing
2025 * until its age reaches to MaxAge.
2027 /* XXX: We should deal with this for *ALL* LSAs, not
2029 if (current
== NULL
) {
2030 if (IS_DEBUG_OSPF_EVENT
)
2032 "LSA[%s]: Previously originated Opaque-LSA,"
2033 "not found in the LSDB.",
2036 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2038 ospf_opaque_self_originated_lsa_received(nbr
,
2040 ospf_ls_ack_send(nbr
, lsa
);
2046 /* It might be happen that received LSA is self-originated
2048 * router ID is changed. So, we should check if LSA is a
2050 * Link State ID is one of the router's own IP interface
2051 * addresses but whose
2052 * Advertising Router is not equal to the router's own Router ID
2053 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2057 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2058 struct listnode
*oinode
, *oinnode
;
2059 struct ospf_interface
*out_if
;
2062 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2067 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2069 && (!(IPV4_ADDR_SAME(
2070 &oi
->ospf
->router_id
,
2071 &lsa
->data
->adv_router
)))) {
2072 if (out_if
->network_lsa_self
) {
2073 ospf_lsa_flush_area(
2075 if (IS_DEBUG_OSPF_EVENT
)
2077 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2081 ospf_lsa_discard(lsa
);
2091 /* (5) Find the instance of this LSA that is currently contained
2092 in the router's link state database. If there is no
2093 database copy, or the received LSA is more recent than
2094 the database copy the following steps must be performed.
2095 (The sub steps from RFC 2328 section 13 step (5) will be
2100 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2101 /* Actual flooding procedure. */
2102 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2103 < 0) /* Trap NSSA later. */
2104 DISCARD_LSA(lsa
, 4);
2108 /* (6) Else, If there is an instance of the LSA on the sending
2109 neighbor's Link state request list, an error has occurred in
2110 the Database Exchange process. In this case, restart the
2111 Database Exchange process by generating the neighbor event
2112 BadLSReq for the sending neighbor and stop processing the
2113 Link State Update packet. */
2115 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2116 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2119 "LSA[%s] instance exists on Link state request list",
2122 /* Clean list of LSAs. */
2123 ospf_upd_list_clean(lsas
);
2124 /* this lsa is not on lsas list already. */
2125 ospf_lsa_discard(lsa
);
2129 /* If the received LSA is the same instance as the database copy
2130 (i.e., neither one is more recent) the following two steps
2131 should be performed: */
2134 /* If the LSA is listed in the Link state retransmission
2136 for the receiving adjacency, the router itself is
2138 an acknowledgment for this LSA. The router should
2140 received LSA as an acknowledgment by removing the LSA
2142 the Link state retransmission list. This is termed
2144 "implied acknowledgment". */
2146 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2148 if (ls_ret
!= NULL
) {
2149 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2151 /* Delayed acknowledgment sent if advertisement
2153 from Designated Router, otherwise do nothing.
2155 if (oi
->state
== ISM_Backup
)
2159 ospf_lsa_lock(lsa
));
2161 DISCARD_LSA(lsa
, 5);
2163 /* Acknowledge the receipt of the LSA by sending a
2164 Link State Acknowledgment packet back out the
2168 ospf_ls_ack_send(nbr
, lsa
);
2169 DISCARD_LSA(lsa
, 6);
2173 /* The database copy is more recent. If the database copy
2174 has LS age equal to MaxAge and LS sequence number equal to
2175 MaxSequenceNumber, simply discard the received LSA without
2176 acknowledging it. (In this case, the LSA's LS sequence number
2178 wrapping, and the MaxSequenceNumber LSA must be completely
2179 flushed before any new LSA instance can be introduced). */
2181 else if (ret
> 0) /* Database copy is more recent */
2183 if (IS_LSA_MAXAGE(current
)
2184 && current
->data
->ls_seqnum
2185 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2186 DISCARD_LSA(lsa
, 7);
2188 /* Otherwise, as long as the database copy has not been
2190 Link State Update within the last MinLSArrival
2192 database copy back to the sending neighbor,
2194 a Link State Update Packet. The Link State Update
2196 be sent directly to the neighbor. In so doing, do not
2198 database copy of the LSA on the neighbor's link state
2199 retransmission list, and do not acknowledge the
2201 recent) LSA instance. */
2203 if (monotime_since(¤t
->tv_orig
, NULL
)
2204 >= ospf
->min_ls_arrival
* 1000LL)
2205 /* Trap NSSA type later.*/
2206 ospf_ls_upd_send_lsa(
2208 OSPF_SEND_PACKET_DIRECT
);
2209 DISCARD_LSA(lsa
, 8);
2215 assert(listcount(lsas
) == 0);
2219 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2220 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2221 struct stream
*s
, struct ospf_interface
*oi
,
2224 struct ospf_neighbor
*nbr
;
2226 /* increment statistics. */
2229 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2231 flog_warn(EC_OSPF_PACKET
,
2232 "Link State Acknowledgment: Unknown Neighbor %s.",
2233 inet_ntoa(ospfh
->router_id
));
2237 /* Add event to thread. */
2238 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
2240 if (nbr
->state
< NSM_Exchange
) {
2241 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2243 "Link State Acknowledgment: "
2244 "Neighbor[%s] state %s is less than Exchange",
2245 inet_ntoa(ospfh
->router_id
),
2246 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2251 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2252 struct ospf_lsa
*lsa
, *lsr
;
2254 lsa
= ospf_lsa_new();
2255 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2256 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2258 /* lsah = (struct lsa_header *) stream_pnt (s); */
2259 size
-= OSPF_LSA_HEADER_SIZE
;
2260 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2262 if (lsa
->data
->type
< OSPF_MIN_LSA
2263 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2265 ospf_lsa_discard(lsa
);
2269 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2271 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0)
2272 ospf_ls_retransmit_delete(nbr
, lsr
);
2275 ospf_lsa_discard(lsa
);
2281 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2282 struct interface
**ifp
,
2283 struct stream
*ibuf
)
2288 ifindex_t ifindex
= 0;
2290 /* Header and data both require alignment. */
2291 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2294 memset(&msgh
, 0, sizeof(struct msghdr
));
2295 msgh
.msg_iov
= &iov
;
2296 msgh
.msg_iovlen
= 1;
2297 msgh
.msg_control
= (caddr_t
)buff
;
2298 msgh
.msg_controllen
= sizeof(buff
);
2300 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, 0, OSPF_MAX_PACKET_SIZE
+ 1);
2302 flog_warn(EC_OSPF_PACKET
, "stream_recvmsg failed: %s",
2303 safe_strerror(errno
));
2306 if ((unsigned int)ret
< sizeof(iph
)) /* ret must be > 0 now */
2310 "ospf_recv_packet: discarding runt packet of length %d "
2311 "(ip header size is %u)",
2312 ret
, (unsigned int)sizeof(iph
));
2316 /* Note that there should not be alignment problems with this assignment
2317 because this is at the beginning of the stream data buffer. */
2318 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2319 sockopt_iphdrincl_swab_systoh(iph
);
2321 ip_len
= iph
->ip_len
;
2323 #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000)
2325 * Kernel network code touches incoming IP header parameters,
2326 * before protocol specific processing.
2328 * 1) Convert byteorder to host representation.
2329 * --> ip_len, ip_id, ip_off
2331 * 2) Adjust ip_len to strip IP header size!
2332 * --> If user process receives entire IP packet via RAW
2333 * socket, it must consider adding IP header size to
2334 * the "ip_len" field of "ip" structure.
2336 * For more details, see <netinet/ip_input.c>.
2338 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2341 #if defined(__DragonFly__)
2343 * in DragonFly's raw socket, ip_len/ip_off are read
2344 * in network byte order.
2345 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2347 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2350 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2352 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2354 if (ret
!= ip_len
) {
2357 "ospf_recv_packet read length mismatch: ip_len is %d, "
2358 "but recvmsg returned %d",
2366 static struct ospf_interface
*
2367 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2368 struct ip
*iph
, struct ospf_header
*ospfh
)
2370 struct ospf_interface
*rcv_oi
;
2371 struct ospf_vl_data
*vl_data
;
2372 struct ospf_area
*vl_area
;
2373 struct listnode
*node
;
2375 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2376 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2379 /* look for local OSPF interface matching the destination
2380 * to determine Area ID. We presume therefore the destination address
2381 * is unique, or at least (for "unnumbered" links), not used in other
2384 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2388 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2390 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2394 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2395 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2396 if (IS_DEBUG_OSPF_EVENT
)
2397 zlog_debug("associating packet with %s",
2398 IF_NAME(vl_data
->vl_oi
));
2399 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2400 if (IS_DEBUG_OSPF_EVENT
)
2402 "This VL is not up yet, sorry");
2406 return vl_data
->vl_oi
;
2410 if (IS_DEBUG_OSPF_EVENT
)
2411 zlog_debug("couldn't find any VL to associate the packet with");
2416 static int ospf_check_area_id(struct ospf_interface
*oi
,
2417 struct ospf_header
*ospfh
)
2419 /* Check match the Area ID of the receiving interface. */
2420 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2426 /* Unbound socket will accept any Raw IP packets if proto is matched.
2427 To prevent it, compare src IP address and i/f address with masking
2428 i/f network mask. */
2429 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2430 struct in_addr ip_src
)
2432 struct in_addr mask
, me
, him
;
2434 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2435 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2438 masklen2ip(oi
->address
->prefixlen
, &mask
);
2440 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2441 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2443 if (IPV4_ADDR_SAME(&me
, &him
))
2449 /* Return 1, if the packet is properly authenticated and checksummed,
2450 0 otherwise. In particular, check that AuType header field is valid and
2451 matches the locally configured AuType, and that D.5 requirements are met. */
2452 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2454 struct crypt_key
*ck
;
2455 uint16_t iface_auth_type
;
2456 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2458 switch (pkt_auth_type
) {
2459 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2460 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2461 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2464 "interface %s: auth-type mismatch, local %s, rcvd Null",
2466 lookup_msg(ospf_auth_type_str
,
2467 iface_auth_type
, NULL
));
2470 if (!ospf_check_sum(ospfh
)) {
2471 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2474 "interface %s: Null auth OK, but checksum error, Router-ID %s",
2476 inet_ntoa(ospfh
->router_id
));
2480 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2481 if (OSPF_AUTH_SIMPLE
2482 != (iface_auth_type
= ospf_auth_type(oi
))) {
2483 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2486 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2488 lookup_msg(ospf_auth_type_str
,
2489 iface_auth_type
, NULL
));
2492 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2493 OSPF_AUTH_SIMPLE_SIZE
)) {
2494 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2495 flog_warn(EC_OSPF_PACKET
,
2496 "interface %s: Simple auth failed",
2500 if (!ospf_check_sum(ospfh
)) {
2501 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2504 "interface %s: Simple auth OK, checksum error, Router-ID %s",
2506 inet_ntoa(ospfh
->router_id
));
2510 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2511 if (OSPF_AUTH_CRYPTOGRAPHIC
2512 != (iface_auth_type
= ospf_auth_type(oi
))) {
2513 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2516 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2518 lookup_msg(ospf_auth_type_str
,
2519 iface_auth_type
, NULL
));
2522 if (ospfh
->checksum
) {
2523 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2526 "interface %s: OSPF header checksum is not 0",
2530 /* only MD5 crypto method can pass ospf_packet_examin() */
2531 if (NULL
== (ck
= listgetdata(
2532 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2533 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2534 /* Condition above uses the last key ID on the list,
2536 different from what ospf_crypt_key_lookup() does. A
2538 !ospf_check_md5_digest(oi
, ospfh
)) {
2539 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2540 flog_warn(EC_OSPF_MD5
,
2541 "interface %s: MD5 auth failed",
2547 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2550 "interface %s: invalid packet auth-type (%02x)",
2551 IF_NAME(oi
), pkt_auth_type
);
2556 static int ospf_check_sum(struct ospf_header
*ospfh
)
2561 /* clear auth_data for checksum. */
2562 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2564 /* keep checksum and clear. */
2565 sum
= ospfh
->checksum
;
2566 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2568 /* calculate checksum. */
2569 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2572 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2580 /* Verify, that given link/TOS records are properly sized/aligned and match
2581 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2582 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2584 const uint16_t num_links
)
2586 unsigned counted_links
= 0, thislinklen
;
2590 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2591 if (thislinklen
> linkbytes
) {
2592 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2593 zlog_debug("%s: length error in link block #%u",
2594 __func__
, counted_links
);
2597 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2598 linkbytes
-= thislinklen
;
2601 if (counted_links
!= num_links
) {
2602 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2603 zlog_debug("%s: %u link blocks declared, %u present",
2604 __func__
, num_links
, counted_links
);
2610 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2611 minimum length constraint). */
2612 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2613 const uint8_t headeronly
)
2616 struct router_lsa
*rlsa
;
2617 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2618 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2619 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2620 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2621 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2625 switch (lsah
->type
) {
2626 case OSPF_ROUTER_LSA
:
2627 /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1
2628 * (12+)-byte link blocks */
2630 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2631 - OSPF_ROUTER_LSA_MIN_SIZE
)
2637 rlsa
= (struct router_lsa
*)lsah
;
2638 ret
= ospf_router_lsa_links_examin(
2639 (struct router_lsa_link
*)rlsa
->link
,
2640 lsalen
- OSPF_LSA_HEADER_SIZE
- 4, /* skip: basic
2643 ntohs(rlsa
->links
) /* 16 bits */
2646 case OSPF_AS_EXTERNAL_LSA
:
2647 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2649 case OSPF_AS_NSSA_LSA
:
2650 /* RFC3101 C, idem */
2651 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2652 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2657 /* Following LSA types are considered OK length-wise as soon as their
2659 * length constraint is met and length of the whole LSA is a multiple of
2661 * (basic LSA header size is already a multiple of 4). */
2662 case OSPF_NETWORK_LSA
:
2663 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2664 case OSPF_SUMMARY_LSA
:
2665 case OSPF_ASBR_SUMMARY_LSA
:
2666 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2668 case OSPF_OPAQUE_LINK_LSA
:
2669 case OSPF_OPAQUE_AREA_LSA
:
2670 case OSPF_OPAQUE_AS_LSA
:
2671 /* RFC5250 A.2, "some number of octets (of application-specific
2672 * data) padded to 32-bit alignment." This is considered
2674 * to 4-byte alignment of all other LSA types, see
2675 * OSPF-ALIGNMENT.txt
2676 * file for the detailed analysis of this passage. */
2677 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2680 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2681 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2685 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2686 zlog_debug("%s: alignment error in %s", __func__
,
2687 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2691 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2692 includes verification of LSA blocks length/alignment and dispatching
2693 of deeper-level checks. */
2695 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2696 size_t length
, const uint8_t headeronly
,
2697 /* When declared_num_lsas is not 0, compare it to the real
2699 and treat the difference as an error. */
2700 const uint32_t declared_num_lsas
)
2702 uint32_t counted_lsas
= 0;
2706 if (length
< OSPF_LSA_HEADER_SIZE
) {
2707 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2709 "%s: undersized (%zu B) trailing (#%u) LSA header",
2710 __func__
, length
, counted_lsas
);
2713 /* save on ntohs() calls here and in the LSA validator */
2714 lsalen
= ntohs(lsah
->length
);
2715 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2716 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2718 "%s: malformed LSA header #%u, declared length is %u B",
2719 __func__
, counted_lsas
, lsalen
);
2723 /* less checks here and in ospf_lsa_examin() */
2724 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2725 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2727 "%s: malformed header-only LSA #%u",
2728 __func__
, counted_lsas
);
2731 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2732 + OSPF_LSA_HEADER_SIZE
);
2733 length
-= OSPF_LSA_HEADER_SIZE
;
2735 /* make sure the input buffer is deep enough before
2737 if (lsalen
> length
) {
2738 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2740 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2741 __func__
, counted_lsas
, lsalen
,
2745 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2746 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2747 zlog_debug("%s: malformed LSA #%u",
2748 __func__
, counted_lsas
);
2751 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2757 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2758 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2760 "%s: #LSAs declared (%u) does not match actual (%u)",
2761 __func__
, declared_num_lsas
, counted_lsas
);
2767 /* Verify a complete OSPF packet for proper sizing/alignment. */
2768 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2769 const unsigned bytesonwire
)
2771 uint16_t bytesdeclared
, bytesauth
;
2773 struct ospf_ls_update
*lsupd
;
2775 /* Length, 1st approximation. */
2776 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2777 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2778 zlog_debug("%s: undersized (%u B) packet", __func__
,
2782 /* Now it is safe to access header fields. Performing length check,
2784 * for possible extra bytes of crypto auth/padding, which are not
2786 * in the OSPF header "length" field. */
2787 if (oh
->version
!= OSPF_VERSION
) {
2788 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2789 zlog_debug("%s: invalid (%u) protocol version",
2790 __func__
, oh
->version
);
2793 bytesdeclared
= ntohs(oh
->length
);
2794 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2797 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2798 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2800 "%s: unsupported crypto auth length (%u B)",
2801 __func__
, oh
->u
.crypt
.auth_data_len
);
2804 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2806 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2807 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2809 "%s: packet length error (%u real, %u+%u declared)",
2810 __func__
, bytesonwire
, bytesdeclared
,
2814 /* Length, 2nd approximation. The type-specific constraint is checked
2815 against declared length, not amount of bytes on wire. */
2816 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2818 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2819 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2820 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2822 lookup_msg(ospf_packet_type_str
, oh
->type
,
2827 case OSPF_MSG_HELLO
:
2828 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2830 by N>=0 router-IDs. */
2831 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2836 case OSPF_MSG_DB_DESC
:
2837 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2839 by N>=0 header-only LSAs. */
2840 ret
= ospf_lsaseq_examin(
2841 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2842 + OSPF_DB_DESC_MIN_SIZE
),
2843 bytesdeclared
- OSPF_HEADER_SIZE
2844 - OSPF_DB_DESC_MIN_SIZE
,
2845 1, /* header-only LSAs */
2848 case OSPF_MSG_LS_REQ
:
2849 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2850 * request blocks. */
2851 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2856 case OSPF_MSG_LS_UPD
:
2857 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2859 by N>=0 full LSAs (with N declared beforehand). */
2860 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2861 + OSPF_HEADER_SIZE
);
2862 ret
= ospf_lsaseq_examin(
2863 (struct lsa_header
*)((caddr_t
)lsupd
2864 + OSPF_LS_UPD_MIN_SIZE
),
2865 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2867 ntohl(lsupd
->num_lsas
) /* 32 bits */
2870 case OSPF_MSG_LS_ACK
:
2871 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2873 ret
= ospf_lsaseq_examin(
2874 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2875 + OSPF_LS_ACK_MIN_SIZE
),
2876 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2877 1, /* header-only LSAs */
2881 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2882 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2886 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2887 zlog_debug("%s: malformed %s packet", __func__
,
2888 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2892 /* OSPF Header verification. */
2893 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2894 struct ip
*iph
, struct ospf_header
*ospfh
)
2896 /* Check Area ID. */
2897 if (!ospf_check_area_id(oi
, ospfh
)) {
2898 flog_warn(EC_OSPF_PACKET
,
2899 "interface %s: ospf_read invalid Area ID %s.",
2900 IF_NAME(oi
), inet_ntoa(ospfh
->area_id
));
2904 /* Check network mask, Silently discarded. */
2905 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2908 "interface %s: ospf_read network address is not same [%s]",
2909 IF_NAME(oi
), inet_ntoa(iph
->ip_src
));
2913 /* Check authentication. The function handles logging actions, where
2915 if (!ospf_check_auth(oi
, ospfh
))
2921 /* Starting point of packet process function. */
2922 int ospf_read(struct thread
*thread
)
2925 struct stream
*ibuf
;
2927 struct ospf_interface
*oi
;
2929 struct ospf_header
*ospfh
;
2931 struct interface
*ifp
= NULL
;
2932 struct connected
*c
;
2934 /* first of all get interface pointer. */
2935 ospf
= THREAD_ARG(thread
);
2937 /* prepare for next packet. */
2938 ospf
->t_read
= NULL
;
2939 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
2941 stream_reset(ospf
->ibuf
);
2942 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2945 /* This raw packet is known to be at least as big as its IP header. */
2947 /* Note that there should not be alignment problems with this assignment
2948 because this is at the beginning of the stream data buffer. */
2949 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2950 /* Note that sockopt_iphdrincl_swab_systoh was called in
2951 * ospf_recv_packet. */
2954 /* Handle cases where the platform does not support retrieving
2956 and also platforms (such as Solaris 8) that claim to support
2958 retrieval but do not. */
2959 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2967 /* IP Header dump. */
2968 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2969 ospf_ip_header_dump(iph
);
2971 /* Self-originated packet should be discarded silently. */
2972 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
2973 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
2975 "ospf_read[%s]: Dropping self-originated packet",
2976 inet_ntoa(iph
->ip_src
));
2981 /* Advance from IP header to OSPF header (iph->ip_hl has been verified
2982 by ospf_recv_packet() to be correct). */
2983 stream_forward_getp(ibuf
, iph
->ip_hl
* 4);
2985 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
2987 != ospf_packet_examin(
2988 ospfh
, stream_get_endp(ibuf
) - stream_get_getp(ibuf
)))
2990 /* Now it is safe to access all fields of OSPF packet header. */
2992 /* associate packet with ospf interface */
2993 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
2995 /* ospf_verify_header() relies on a valid "oi" and thus can be called
2997 after the passive/backbone/other checks below are passed. These
2999 in turn access the fields of unverified "ospfh" structure for their
3001 purposes and must remain very accurate in doing this. */
3003 /* If incoming interface is passive one, ignore it. */
3004 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
3005 char buf
[3][INET_ADDRSTRLEN
];
3007 if (IS_DEBUG_OSPF_EVENT
)
3009 "ignoring packet from router %s sent to %s, "
3010 "received on a passive interface, %s",
3011 inet_ntop(AF_INET
, &ospfh
->router_id
, buf
[0],
3013 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3015 inet_ntop(AF_INET
, &oi
->address
->u
.prefix4
,
3016 buf
[2], sizeof(buf
[2])));
3018 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
3019 /* Try to fix multicast membership.
3020 * Some OS:es may have problems in this area,
3021 * make sure it is removed.
3023 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3024 ospf_if_set_multicast(oi
);
3030 /* if no local ospf_interface,
3031 * or header area is backbone but ospf_interface is not
3032 * check for VLINK interface
3034 if ((oi
== NULL
) || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
3035 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
3036 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
3038 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
3040 "Packet from [%s] received on link %s"
3041 " but no ospf_interface",
3042 inet_ntoa(iph
->ip_src
), ifp
->name
);
3047 /* else it must be a local ospf interface, check it was received on
3050 else if (oi
->ifp
!= ifp
) {
3051 if (IS_DEBUG_OSPF_EVENT
)
3052 flog_warn(EC_OSPF_PACKET
,
3053 "Packet from [%s] received on wrong link %s",
3054 inet_ntoa(iph
->ip_src
), ifp
->name
);
3056 } else if (oi
->state
== ISM_Down
) {
3057 char buf
[2][INET_ADDRSTRLEN
];
3060 "Ignoring packet from %s to %s received on interface that is "
3061 "down [%s]; interface flags are %s",
3062 inet_ntop(AF_INET
, &iph
->ip_src
, buf
[0],
3064 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3066 ifp
->name
, if_flag_dump(ifp
->flags
));
3067 /* Fix multicast memberships? */
3068 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3069 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3070 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3071 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3072 if (oi
->multicast_memberships
)
3073 ospf_if_set_multicast(oi
);
3078 * If the received packet is destined for AllDRouters, the packet
3079 * should be accepted only if the received ospf interface state is
3080 * either DR or Backup -- endo.
3082 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3083 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3086 "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)",
3087 inet_ntoa(iph
->ip_src
), IF_NAME(oi
),
3088 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3089 /* Try to fix multicast membership. */
3090 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3091 ospf_if_set_multicast(oi
);
3095 /* Verify more OSPF header fields. */
3096 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3098 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3100 "ospf_read[%s]: Header check failed, "
3102 inet_ntoa(iph
->ip_src
));
3106 /* Show debug receiving packet. */
3107 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3108 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3110 "-----------------------------------------------------");
3111 ospf_packet_dump(ibuf
);
3114 zlog_debug("%s received from [%s] via [%s]",
3115 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3116 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
3117 zlog_debug(" src [%s],", inet_ntoa(iph
->ip_src
));
3118 zlog_debug(" dst [%s]", inet_ntoa(iph
->ip_dst
));
3120 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3122 "-----------------------------------------------------");
3125 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3127 /* Adjust size to message length. */
3128 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3130 /* Read rest of the packet and call each sort of packet routine. */
3131 switch (ospfh
->type
) {
3132 case OSPF_MSG_HELLO
:
3133 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3135 case OSPF_MSG_DB_DESC
:
3136 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3138 case OSPF_MSG_LS_REQ
:
3139 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3141 case OSPF_MSG_LS_UPD
:
3142 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3144 case OSPF_MSG_LS_ACK
:
3145 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3148 flog_warn(EC_OSPF_PACKET
,
3149 "interface %s: OSPF packet header type %d is illegal",
3150 IF_NAME(oi
), ospfh
->type
);
3157 /* Make OSPF header. */
3158 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3161 struct ospf_header
*ospfh
;
3163 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3165 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3166 ospfh
->type
= (uint8_t)type
;
3168 ospfh
->router_id
= oi
->ospf
->router_id
;
3170 ospfh
->checksum
= 0;
3171 ospfh
->area_id
= oi
->area
->area_id
;
3172 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3174 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3176 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3179 /* Make Authentication Data. */
3180 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3182 struct crypt_key
*ck
;
3184 switch (ospf_auth_type(oi
)) {
3185 case OSPF_AUTH_NULL
:
3186 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3189 case OSPF_AUTH_SIMPLE
:
3190 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3191 OSPF_AUTH_SIMPLE_SIZE
);
3193 case OSPF_AUTH_CRYPTOGRAPHIC
:
3194 /* If key is not set, then set 0. */
3195 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3196 ospfh
->u
.crypt
.zero
= 0;
3197 ospfh
->u
.crypt
.key_id
= 0;
3198 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3201 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3202 ospfh
->u
.crypt
.zero
= 0;
3203 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3204 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3206 /* note: the seq is done in ospf_make_md5_digest() */
3209 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3217 /* Fill rest of OSPF header. */
3218 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3221 struct ospf_header
*ospfh
;
3223 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3226 ospfh
->length
= htons(length
);
3228 /* Calculate checksum. */
3229 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3230 ospfh
->checksum
= in_cksum(ospfh
, length
);
3232 ospfh
->checksum
= 0;
3234 /* Add Authentication Data. */
3235 ospf_make_auth(oi
, ospfh
);
3238 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3240 struct ospf_neighbor
*nbr
;
3241 struct route_node
*rn
;
3242 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3243 struct in_addr mask
;
3247 /* Set netmask of interface. */
3248 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3249 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3250 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3251 masklen2ip(oi
->address
->prefixlen
, &mask
);
3253 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3254 stream_put_ipv4(s
, mask
.s_addr
);
3256 /* Set Hello Interval. */
3257 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3258 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3260 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3262 if (IS_DEBUG_OSPF_EVENT
)
3263 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3267 stream_putc(s
, OPTIONS(oi
));
3269 /* Set Router Priority. */
3270 stream_putc(s
, PRIORITY(oi
));
3272 /* Set Router Dead Interval. */
3273 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3275 /* Set Designated Router. */
3276 stream_put_ipv4(s
, DR(oi
).s_addr
);
3278 p
= stream_get_endp(s
);
3280 /* Set Backup Designated Router. */
3281 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3283 /* Add neighbor seen. */
3284 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3285 if ((nbr
= rn
->info
))
3286 if (nbr
->router_id
.s_addr
3287 != 0) /* Ignore 0.0.0.0 node. */
3289 != NSM_Attempt
) /* Ignore Down neighbor. */
3291 != NSM_Down
) /* This is myself for
3293 if (!IPV4_ADDR_SAME(
3295 &oi
->ospf
->router_id
)) {
3296 /* Check neighbor is
3298 if (nbr
->d_router
.s_addr
3319 /* Let neighbor generate BackupSeen. */
3321 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3326 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3327 struct ospf_neighbor
*nbr
, struct stream
*s
)
3329 struct ospf_lsa
*lsa
;
3330 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3334 struct ospf_lsdb
*lsdb
;
3336 /* Set Interface MTU. */
3337 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3340 stream_putw(s
, oi
->ifp
->mtu
);
3343 options
= OPTIONS(oi
);
3344 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3345 SET_FLAG(options
, OSPF_OPTION_O
);
3346 stream_putc(s
, options
);
3349 pp
= stream_get_endp(s
);
3350 stream_putc(s
, nbr
->dd_flags
);
3352 /* Set DD Sequence Number. */
3353 stream_putl(s
, nbr
->dd_seqnum
);
3355 /* shortcut unneeded walk of (empty) summary LSDBs */
3356 if (ospf_db_summary_isempty(nbr
))
3359 /* Describe LSA Header from Database Summary List. */
3360 lsdb
= &nbr
->db_sum
;
3362 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3363 struct route_table
*table
= lsdb
->type
[i
].db
;
3364 struct route_node
*rn
;
3366 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3367 if ((lsa
= rn
->info
) != NULL
) {
3368 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3369 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3370 /* Suppress advertising
3371 * opaque-information. */
3372 /* Remove LSA from DB summary list. */
3373 ospf_lsdb_delete(lsdb
, lsa
);
3377 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3378 struct lsa_header
*lsah
;
3381 /* DD packet overflows interface MTU. */
3382 if (length
+ OSPF_LSA_HEADER_SIZE
3383 > ospf_packet_max(oi
))
3386 /* Keep pointer to LS age. */
3387 lsah
= (struct lsa_header
3392 /* Proceed stream pointer. */
3393 stream_put(s
, lsa
->data
,
3394 OSPF_LSA_HEADER_SIZE
);
3395 length
+= OSPF_LSA_HEADER_SIZE
;
3398 ls_age
= LS_AGE(lsa
);
3399 lsah
->ls_age
= htons(ls_age
);
3402 /* Remove LSA from DB summary list. */
3403 ospf_lsdb_delete(lsdb
, lsa
);
3407 /* Update 'More' bit */
3408 if (ospf_db_summary_isempty(nbr
)) {
3410 if (nbr
->state
>= NSM_Exchange
) {
3411 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3412 /* Rewrite DD flags */
3413 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3415 assert(IS_SET_DD_M(nbr
->dd_flags
));
3421 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3422 unsigned long delta
, struct ospf_neighbor
*nbr
,
3423 struct ospf_lsa
*lsa
)
3425 struct ospf_interface
*oi
;
3429 /* LS Request packet overflows interface MTU. */
3430 if (*length
+ delta
> ospf_packet_max(oi
))
3433 stream_putl(s
, lsa
->data
->type
);
3434 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3435 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3437 ospf_lsa_unlock(&nbr
->ls_req_last
);
3438 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3444 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3446 struct ospf_lsa
*lsa
;
3447 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3448 unsigned long delta
= stream_get_endp(s
) + 12;
3449 struct route_table
*table
;
3450 struct route_node
*rn
;
3452 struct ospf_lsdb
*lsdb
;
3454 lsdb
= &nbr
->ls_req
;
3456 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3457 table
= lsdb
->type
[i
].db
;
3458 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3459 if ((lsa
= (rn
->info
)) != NULL
)
3460 if (ospf_make_ls_req_func(s
, &length
, delta
,
3463 route_unlock_node(rn
);
3470 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3474 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3476 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3479 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3482 struct ospf_lsa
*lsa
;
3483 struct listnode
*node
;
3484 uint16_t length
= 0;
3485 unsigned int size_noauth
;
3486 unsigned long delta
= stream_get_endp(s
);
3490 if (IS_DEBUG_OSPF_EVENT
)
3491 zlog_debug("ospf_make_ls_upd: Start");
3493 pp
= stream_get_endp(s
);
3494 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3495 length
+= OSPF_LS_UPD_MIN_SIZE
;
3497 /* Calculate amount of packet usable for data. */
3498 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3500 while ((node
= listhead(update
)) != NULL
) {
3501 struct lsa_header
*lsah
;
3504 if (IS_DEBUG_OSPF_EVENT
)
3505 zlog_debug("ospf_make_ls_upd: List Iteration %d",
3508 lsa
= listgetdata(node
);
3513 if (length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
)
3516 /* Keep pointer to LS age. */
3517 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3518 + stream_get_endp(s
));
3520 /* Put LSA to Link State Request. */
3521 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3524 /* each hop must increment an lsa_age by transmit_delay
3525 of OSPF interface */
3526 ls_age
= ls_age_increment(lsa
,
3527 OSPF_IF_PARAM(oi
, transmit_delay
));
3528 lsah
->ls_age
= htons(ls_age
);
3530 length
+= ntohs(lsa
->data
->length
);
3533 list_delete_node(update
, node
);
3534 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3537 /* Now set #LSAs. */
3538 stream_putl_at(s
, pp
, count
);
3540 if (IS_DEBUG_OSPF_EVENT
)
3541 zlog_debug("ospf_make_ls_upd: Stop");
3545 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3548 struct listnode
*node
, *nnode
;
3549 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3550 unsigned long delta
= stream_get_endp(s
) + 24;
3551 struct ospf_lsa
*lsa
;
3553 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3556 if (length
+ delta
> ospf_packet_max(oi
))
3559 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3560 length
+= OSPF_LSA_HEADER_SIZE
;
3562 listnode_delete(ack
, lsa
);
3563 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3569 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3571 struct ospf_packet
*op
;
3572 uint16_t length
= OSPF_HEADER_SIZE
;
3574 op
= ospf_packet_new(oi
->ifp
->mtu
);
3576 /* Prepare OSPF common header. */
3577 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3579 /* Prepare OSPF Hello body. */
3580 length
+= ospf_make_hello(oi
, op
->s
);
3582 /* Fill OSPF header. */
3583 ospf_fill_header(oi
, op
->s
, length
);
3585 /* Set packet length. */
3586 op
->length
= length
;
3588 op
->dst
.s_addr
= addr
;
3590 if (IS_DEBUG_OSPF_EVENT
) {
3591 if (oi
->ospf
->vrf_id
)
3593 "%s: Hello Tx interface %s ospf vrf %s id %u",
3594 __PRETTY_FUNCTION__
, oi
->ifp
->name
,
3595 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3598 /* Add packet to the top of the interface output queue, so that they
3599 * can't get delayed by things like long queues of LS Update packets
3601 ospf_packet_add_top(oi
, op
);
3603 /* Hook thread to write packet. */
3604 OSPF_ISM_WRITE_ON(oi
->ospf
);
3607 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3609 struct ospf_interface
*oi
;
3614 /* If this is passive interface, do not send OSPF Hello. */
3615 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3618 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3621 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3624 if (PRIORITY(oi
) == 0)
3627 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3628 && oi
->state
!= ISM_Backup
)
3631 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3634 int ospf_poll_timer(struct thread
*thread
)
3636 struct ospf_nbr_nbma
*nbr_nbma
;
3638 nbr_nbma
= THREAD_ARG(thread
);
3639 nbr_nbma
->t_poll
= NULL
;
3641 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3642 zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)",
3643 IF_NAME(nbr_nbma
->oi
), inet_ntoa(nbr_nbma
->addr
));
3645 ospf_poll_send(nbr_nbma
);
3647 if (nbr_nbma
->v_poll
> 0)
3648 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3655 int ospf_hello_reply_timer(struct thread
*thread
)
3657 struct ospf_neighbor
*nbr
;
3659 nbr
= THREAD_ARG(thread
);
3660 nbr
->t_hello_reply
= NULL
;
3664 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3665 zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)",
3666 IF_NAME(nbr
->oi
), inet_ntoa(nbr
->router_id
));
3668 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3673 /* Send OSPF Hello. */
3674 void ospf_hello_send(struct ospf_interface
*oi
)
3676 /* If this is passive interface, do not send OSPF Hello. */
3677 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3680 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3681 struct ospf_neighbor
*nbr
;
3682 struct route_node
*rn
;
3684 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3685 if ((nbr
= rn
->info
))
3686 if (nbr
!= oi
->nbr_self
)
3687 if (nbr
->state
!= NSM_Down
) {
3688 /* RFC 2328 Section 9.5.1
3689 If the router is not
3690 eligible to become Designated
3692 it must periodically send
3693 Hello Packets to both the
3694 Designated Router and the
3695 Backup Designated Router (if
3698 if (PRIORITY(oi
) == 0
3709 /* If the router is eligible to
3710 become Designated Router, it
3711 must periodically send Hello
3712 Packets to all neighbors that
3713 are also eligible. In
3714 addition, if the router is
3716 Designated Router or Backup
3717 Designated Router, it must
3719 send periodic Hello Packets
3720 to all other neighbors. */
3722 if (nbr
->priority
== 0
3723 && oi
->state
== ISM_DROther
)
3725 /* if oi->state == Waiting, send
3726 * hello to all neighbors */
3727 ospf_hello_send_sub(
3729 nbr
->address
.u
.prefix4
3733 /* Decide destination address. */
3734 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3735 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3737 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3741 /* Send OSPF Database Description. */
3742 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3744 struct ospf_interface
*oi
;
3745 struct ospf_packet
*op
;
3746 uint16_t length
= OSPF_HEADER_SIZE
;
3749 op
= ospf_packet_new(oi
->ifp
->mtu
);
3751 /* Prepare OSPF common header. */
3752 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3754 /* Prepare OSPF Database Description body. */
3755 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3757 /* Fill OSPF header. */
3758 ospf_fill_header(oi
, op
->s
, length
);
3760 /* Set packet length. */
3761 op
->length
= length
;
3763 /* Decide destination address. */
3764 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3765 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3767 op
->dst
= nbr
->address
.u
.prefix4
;
3769 /* Add packet to the interface output queue. */
3770 ospf_packet_add(oi
, op
);
3772 /* Hook thread to write packet. */
3773 OSPF_ISM_WRITE_ON(oi
->ospf
);
3775 /* Remove old DD packet, then copy new one and keep in neighbor
3778 ospf_packet_free(nbr
->last_send
);
3779 nbr
->last_send
= ospf_packet_dup(op
);
3780 monotime(&nbr
->last_send_ts
);
3783 /* Re-send Database Description. */
3784 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3786 struct ospf_interface
*oi
;
3790 /* Add packet to the interface output queue. */
3791 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3793 /* Hook thread to write packet. */
3794 OSPF_ISM_WRITE_ON(oi
->ospf
);
3797 /* Send Link State Request. */
3798 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3800 struct ospf_interface
*oi
;
3801 struct ospf_packet
*op
;
3802 uint16_t length
= OSPF_HEADER_SIZE
;
3805 op
= ospf_packet_new(oi
->ifp
->mtu
);
3807 /* Prepare OSPF common header. */
3808 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3810 /* Prepare OSPF Link State Request body. */
3811 length
+= ospf_make_ls_req(nbr
, op
->s
);
3812 if (length
== OSPF_HEADER_SIZE
) {
3813 ospf_packet_free(op
);
3817 /* Fill OSPF header. */
3818 ospf_fill_header(oi
, op
->s
, length
);
3820 /* Set packet length. */
3821 op
->length
= length
;
3823 /* Decide destination address. */
3824 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3825 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3827 op
->dst
= nbr
->address
.u
.prefix4
;
3829 /* Add packet to the interface output queue. */
3830 ospf_packet_add(oi
, op
);
3832 /* Hook thread to write packet. */
3833 OSPF_ISM_WRITE_ON(oi
->ospf
);
3835 /* Add Link State Request Retransmission Timer. */
3836 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3839 /* Send Link State Update with an LSA. */
3840 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3843 struct list
*update
;
3845 update
= list_new();
3847 listnode_add(update
, lsa
);
3849 /*ospf instance is going down, send self originated
3850 * MAXAGE LSA update to neighbors to remove from LSDB */
3851 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3852 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3854 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3856 list_delete(&update
);
3859 /* Determine size for packet. Must be at least big enough to accomodate next
3860 * LSA on list, which may be bigger than MTU size.
3862 * Return pointer to new ospf_packet
3863 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3864 * on packet sizes (in which case offending LSA is deleted from update list)
3866 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3867 struct ospf_interface
*oi
)
3869 struct ospf_lsa
*lsa
;
3870 struct listnode
*ln
;
3872 static char warned
= 0;
3874 lsa
= listgetdata((ln
= listhead(update
)));
3877 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3878 > ospf_packet_max(oi
)) {
3882 "ospf_ls_upd_packet_new: oversized LSA encountered!"
3883 "will need to fragment. Not optimal. Try divide up"
3884 " your network with areas. Use 'debug ospf packet send'"
3885 " to see details, or look at 'show ip ospf database ..'");
3889 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3891 "ospf_ls_upd_packet_new: oversized LSA id:%s,"
3892 " %d bytes originated by %s, will be fragmented!",
3893 inet_ntoa(lsa
->data
->id
),
3894 ntohs(lsa
->data
->length
),
3895 inet_ntoa(lsa
->data
->adv_router
));
3898 * Allocate just enough to fit this LSA only, to avoid including
3900 * LSAs in fragmented LSA Updates.
3902 size
= ntohs(lsa
->data
->length
)
3903 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
3904 + OSPF_LS_UPD_MIN_SIZE
;
3906 size
= oi
->ifp
->mtu
;
3908 if (size
> OSPF_MAX_PACKET_SIZE
) {
3909 flog_warn(EC_OSPF_LARGE_LSA
,
3910 "ospf_ls_upd_packet_new: oversized LSA id:%s too big,"
3911 " %d bytes, packet size %ld, dropping it completely."
3912 " OSPF routing is broken!",
3913 inet_ntoa(lsa
->data
->id
), ntohs(lsa
->data
->length
),
3915 list_delete_node(update
, ln
);
3919 /* IP header is built up separately by ospf_write(). This means, that we
3921 * reduce the "affordable" size just calculated by length of an IP
3923 * This makes sure, that even if we manage to fill the payload with LSA
3925 * completely, the final packet (our data plus IP header) still fits
3927 * outgoing interface MTU. This correction isn't really meaningful for
3929 * oversized LSA, but for consistency the correction is done for both
3932 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
3934 return ospf_packet_new(size
- sizeof(struct ip
));
3937 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
3938 struct list
*update
, struct in_addr addr
,
3941 struct ospf_packet
*op
;
3942 uint16_t length
= OSPF_HEADER_SIZE
;
3944 if (IS_DEBUG_OSPF_EVENT
)
3945 zlog_debug("listcount = %d, [%s]dst %s", listcount(update
),
3946 IF_NAME(oi
), inet_ntoa(addr
));
3948 /* Check that we have really something to process */
3949 if (listcount(update
) == 0)
3952 op
= ospf_ls_upd_packet_new(update
, oi
);
3954 /* Prepare OSPF common header. */
3955 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
3957 /* Prepare OSPF Link State Update body.
3958 * Includes Type-7 translation.
3960 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
3962 /* Fill OSPF header. */
3963 ospf_fill_header(oi
, op
->s
, length
);
3965 /* Set packet length. */
3966 op
->length
= length
;
3968 /* Decide destination address. */
3969 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3970 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3972 op
->dst
.s_addr
= addr
.s_addr
;
3974 /* Add packet to the interface output queue. */
3975 ospf_packet_add(oi
, op
);
3976 /* Call ospf_write() right away to send ospf packets to neighbors */
3977 if (send_lsupd_now
) {
3978 struct thread os_packet_thd
;
3980 os_packet_thd
.arg
= (void *)oi
->ospf
;
3981 if (oi
->on_write_q
== 0) {
3982 listnode_add(oi
->ospf
->oi_write_q
, oi
);
3985 ospf_write(&os_packet_thd
);
3987 /* Hook thread to write packet. */
3988 OSPF_ISM_WRITE_ON(oi
->ospf
);
3992 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
3994 struct ospf_interface
*oi
= THREAD_ARG(thread
);
3995 struct route_node
*rn
;
3996 struct route_node
*rnext
;
3997 struct list
*update
;
4000 oi
->t_ls_upd_event
= NULL
;
4002 if (IS_DEBUG_OSPF_EVENT
)
4003 zlog_debug("ospf_ls_upd_send_queue start");
4005 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4006 rnext
= route_next(rn
);
4008 if (rn
->info
== NULL
)
4011 update
= (struct list
*)rn
->info
;
4013 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
4015 /* list might not be empty. */
4016 if (listcount(update
) == 0) {
4017 list_delete((struct list
**)&rn
->info
);
4018 route_unlock_node(rn
);
4024 if (IS_DEBUG_OSPF_EVENT
)
4026 "ospf_ls_upd_send_queue: update lists not cleared,"
4027 " %d nodes to try again, raising new event",
4029 oi
->t_ls_upd_event
= NULL
;
4030 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4031 &oi
->t_ls_upd_event
);
4034 if (IS_DEBUG_OSPF_EVENT
)
4035 zlog_debug("ospf_ls_upd_send_queue stop");
4040 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
4043 struct ospf_interface
*oi
;
4044 struct ospf_lsa
*lsa
;
4045 struct prefix_ipv4 p
;
4046 struct route_node
*rn
;
4047 struct listnode
*node
;
4052 p
.prefixlen
= IPV4_MAX_BITLEN
;
4054 /* Decide destination address. */
4055 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4056 p
.prefix
= oi
->vl_data
->peer_addr
;
4057 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4058 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4059 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4060 p
.prefix
= nbr
->address
.u
.prefix4
;
4061 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4062 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4063 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4064 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4066 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4068 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4069 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4072 "* LS-Update is directly sent on NBMA network.");
4073 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4074 flog_warn(EC_OSPF_PACKET
,
4075 "* LS-Update is sent to myself.");
4078 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4080 if (rn
->info
== NULL
)
4081 rn
->info
= list_new();
4083 route_unlock_node(rn
);
4085 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4086 listnode_add(rn
->info
,
4087 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4088 if (send_lsupd_now
) {
4089 struct list
*send_update_list
;
4090 struct route_node
*rnext
;
4092 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4093 rnext
= route_next(rn
);
4095 if (rn
->info
== NULL
)
4098 send_update_list
= (struct list
*)rn
->info
;
4100 ospf_ls_upd_queue_send(oi
, send_update_list
,
4101 rn
->p
.u
.prefix4
, 1);
4104 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4105 &oi
->t_ls_upd_event
);
4108 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4111 struct ospf_packet
*op
;
4112 uint16_t length
= OSPF_HEADER_SIZE
;
4114 op
= ospf_packet_new(oi
->ifp
->mtu
);
4116 /* Prepare OSPF common header. */
4117 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4119 /* Prepare OSPF Link State Acknowledgment body. */
4120 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4122 /* Fill OSPF header. */
4123 ospf_fill_header(oi
, op
->s
, length
);
4125 /* Set packet length. */
4126 op
->length
= length
;
4128 /* Decide destination address. */
4129 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4130 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4132 op
->dst
.s_addr
= dst
.s_addr
;
4134 /* Add packet to the interface output queue. */
4135 ospf_packet_add(oi
, op
);
4137 /* Hook thread to write packet. */
4138 OSPF_ISM_WRITE_ON(oi
->ospf
);
4141 static int ospf_ls_ack_send_event(struct thread
*thread
)
4143 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4145 oi
->t_ls_ack_direct
= NULL
;
4147 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4148 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4149 oi
->ls_ack_direct
.dst
);
4154 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4156 struct ospf_interface
*oi
= nbr
->oi
;
4158 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4159 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4161 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4163 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4164 &oi
->t_ls_ack_direct
);
4167 /* Send Link State Acknowledgment delayed. */
4168 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4172 /* Decide destination address. */
4173 /* RFC2328 Section 13.5 On non-broadcast
4174 networks, delayed Link State Acknowledgment packets must be
4175 unicast separately over each adjacency (i.e., neighbor whose
4176 state is >= Exchange). */
4177 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4178 struct ospf_neighbor
*nbr
;
4179 struct route_node
*rn
;
4181 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4182 if ((nbr
= rn
->info
) != NULL
)
4183 if (nbr
!= oi
->nbr_self
4184 && nbr
->state
>= NSM_Exchange
)
4185 while (listcount(oi
->ls_ack
))
4186 ospf_ls_ack_send_list(
4188 nbr
->address
.u
.prefix4
);
4191 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4192 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4193 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4194 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4195 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4196 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4197 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4198 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4200 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4202 while (listcount(oi
->ls_ack
))
4203 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4207 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4208 * address. As a result, the kernel does not need to learn the interface
4209 * MAC of the OSPF neighbor. However, in our world, this will delay
4210 * convergence. Take the case when due to a link flap, all routes now
4211 * want to use an interface which was deemed to be costlier prior to this
4212 * event. For routes that will be installed, the missing MAC will have
4213 * punt-to-CPU set on them. This may overload the CPU control path that
4214 * can be avoided if the MAC was known apriori.
4216 #define OSPF_PING_NBR_STR_MAX (BUFSIZ)
4217 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4219 char ping_nbr
[OSPF_PING_NBR_STR_MAX
];
4222 if (!nbr
|| !nbr
->oi
|| !nbr
->oi
->ifp
)
4225 snprintf(ping_nbr
, sizeof(ping_nbr
),
4226 "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr
->oi
->ifp
->name
,
4227 inet_ntoa(nbr
->address
.u
.prefix4
));
4229 ret
= system(ping_nbr
);
4230 if (IS_DEBUG_OSPF_EVENT
)
4231 zlog_debug("Executed %s %s", ping_nbr
,
4232 ((ret
== 0) ? "successfully" : "but failed"));