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 "ospf_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"
55 * OSPF Fragmentation / fragmented writes
57 * ospfd can support writing fragmented packets, for cases where
58 * kernel will not fragment IP_HDRINCL and/or multicast destined
59 * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However,
60 * SunOS, probably BSD too, clobber the user supplied IP ID and IP
61 * flags fields, hence user-space fragmentation will not work.
62 * Only Linux is known to leave IP header unmolested.
63 * Further, fragmentation really should be done the kernel, which already
64 * supports it, and which avoids nasty IP ID state problems.
66 * Fragmentation of OSPF packets can be required on networks with router
67 * with many many interfaces active in one area, or on networks with links
71 #define WANT_OSPF_WRITE_FRAGMENT
74 /* Packet Type String. */
75 const struct message ospf_packet_type_str
[] = {
76 {OSPF_MSG_HELLO
, "Hello"},
77 {OSPF_MSG_DB_DESC
, "Database Description"},
78 {OSPF_MSG_LS_REQ
, "Link State Request"},
79 {OSPF_MSG_LS_UPD
, "Link State Update"},
80 {OSPF_MSG_LS_ACK
, "Link State Acknowledgment"},
83 /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of
84 particular types, offset is the "type" field of a packet. */
85 static const uint16_t ospf_packet_minlen
[] = {
88 OSPF_DB_DESC_MIN_SIZE
,
94 /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular
95 types, offset is the "LSA type" field. */
96 static const uint16_t ospf_lsa_minlen
[] = {
98 OSPF_ROUTER_LSA_MIN_SIZE
,
99 OSPF_NETWORK_LSA_MIN_SIZE
,
100 OSPF_SUMMARY_LSA_MIN_SIZE
,
101 OSPF_SUMMARY_LSA_MIN_SIZE
,
102 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
104 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
111 /* for ospf_check_auth() */
112 static int ospf_check_sum(struct ospf_header
*);
114 /* OSPF authentication checking function */
115 static int ospf_auth_type(struct ospf_interface
*oi
)
119 if (OSPF_IF_PARAM(oi
, auth_type
) == OSPF_AUTH_NOTSET
)
120 auth_type
= oi
->area
->auth_type
;
122 auth_type
= OSPF_IF_PARAM(oi
, auth_type
);
124 /* Handle case where MD5 key list is not configured aka Cisco */
125 if (auth_type
== OSPF_AUTH_CRYPTOGRAPHIC
126 && list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
127 return OSPF_AUTH_NULL
;
132 struct ospf_packet
*ospf_packet_new(size_t size
)
134 struct ospf_packet
*new;
136 new = XCALLOC(MTYPE_OSPF_PACKET
, sizeof(struct ospf_packet
));
137 new->s
= stream_new(size
);
142 void ospf_packet_free(struct ospf_packet
*op
)
147 XFREE(MTYPE_OSPF_PACKET
, op
);
150 struct ospf_fifo
*ospf_fifo_new()
152 struct ospf_fifo
*new;
154 new = XCALLOC(MTYPE_OSPF_FIFO
, sizeof(struct ospf_fifo
));
158 /* Add new packet to fifo. */
159 void ospf_fifo_push(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
162 fifo
->tail
->next
= op
;
171 /* Add new packet to head of fifo. */
172 static void ospf_fifo_push_head(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
174 op
->next
= fifo
->head
;
176 if (fifo
->tail
== NULL
)
184 /* Delete first packet from fifo. */
185 struct ospf_packet
*ospf_fifo_pop(struct ospf_fifo
*fifo
)
187 struct ospf_packet
*op
;
192 fifo
->head
= op
->next
;
194 if (fifo
->head
== NULL
)
203 /* Return first fifo entry. */
204 struct ospf_packet
*ospf_fifo_head(struct ospf_fifo
*fifo
)
209 /* Flush ospf packet fifo. */
210 void ospf_fifo_flush(struct ospf_fifo
*fifo
)
212 struct ospf_packet
*op
;
213 struct ospf_packet
*next
;
215 for (op
= fifo
->head
; op
; op
= next
) {
217 ospf_packet_free(op
);
219 fifo
->head
= fifo
->tail
= NULL
;
223 /* Free ospf packet fifo. */
224 void ospf_fifo_free(struct ospf_fifo
*fifo
)
226 ospf_fifo_flush(fifo
);
228 XFREE(MTYPE_OSPF_FIFO
, fifo
);
231 void ospf_packet_add(struct ospf_interface
*oi
, struct ospf_packet
*op
)
235 OSPF_ERR_PKT_PROCESS
,
236 "ospf_packet_add(interface %s in state %d [%s], packet type %s, "
237 "destination %s) called with NULL obuf, ignoring "
238 "(please report this bug)!\n",
239 IF_NAME(oi
), oi
->state
,
240 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
),
241 lookup_msg(ospf_packet_type_str
,
242 stream_getc_from(op
->s
, 1), NULL
),
247 /* Add packet to end of queue. */
248 ospf_fifo_push(oi
->obuf
, op
);
250 /* Debug of packet fifo*/
251 /* ospf_fifo_debug (oi->obuf); */
254 static void ospf_packet_add_top(struct ospf_interface
*oi
,
255 struct ospf_packet
*op
)
259 OSPF_ERR_PKT_PROCESS
,
260 "ospf_packet_add(interface %s in state %d [%s], packet type %s, "
261 "destination %s) called with NULL obuf, ignoring "
262 "(please report this bug)!\n",
263 IF_NAME(oi
), oi
->state
,
264 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
),
265 lookup_msg(ospf_packet_type_str
,
266 stream_getc_from(op
->s
, 1), NULL
),
271 /* Add packet to head of queue. */
272 ospf_fifo_push_head(oi
->obuf
, op
);
274 /* Debug of packet fifo*/
275 /* ospf_fifo_debug (oi->obuf); */
278 void ospf_packet_delete(struct ospf_interface
*oi
)
280 struct ospf_packet
*op
;
282 op
= ospf_fifo_pop(oi
->obuf
);
285 ospf_packet_free(op
);
288 struct ospf_packet
*ospf_packet_dup(struct ospf_packet
*op
)
290 struct ospf_packet
*new;
292 if (stream_get_endp(op
->s
) != op
->length
)
295 "ospf_packet_dup stream %lu ospf_packet %u size mismatch",
296 (unsigned long)STREAM_SIZE(op
->s
), op
->length
);
298 /* Reserve space for MD5 authentication that may be added later. */
299 new = ospf_packet_new(stream_get_endp(op
->s
) + OSPF_AUTH_MD5_SIZE
);
300 stream_copy(new->s
, op
->s
);
303 new->length
= op
->length
;
309 static unsigned int ospf_packet_authspace(struct ospf_interface
*oi
)
313 if (ospf_auth_type(oi
) == OSPF_AUTH_CRYPTOGRAPHIC
)
314 auth
= OSPF_AUTH_MD5_SIZE
;
319 static unsigned int ospf_packet_max(struct ospf_interface
*oi
)
323 max
= oi
->ifp
->mtu
- ospf_packet_authspace(oi
);
325 max
-= (OSPF_HEADER_SIZE
+ sizeof(struct ip
));
331 static int ospf_check_md5_digest(struct ospf_interface
*oi
,
332 struct ospf_header
*ospfh
)
335 unsigned char digest
[OSPF_AUTH_MD5_SIZE
];
336 struct crypt_key
*ck
;
337 struct ospf_neighbor
*nbr
;
338 uint16_t length
= ntohs(ospfh
->length
);
340 /* Get secret key. */
341 ck
= ospf_crypt_key_lookup(OSPF_IF_PARAM(oi
, auth_crypt
),
342 ospfh
->u
.crypt
.key_id
);
344 zlog_warn("interface %s: ospf_check_md5 no key %d", IF_NAME(oi
),
345 ospfh
->u
.crypt
.key_id
);
349 /* check crypto seqnum. */
350 nbr
= ospf_nbr_lookup_by_routerid(oi
->nbrs
, &ospfh
->router_id
);
353 && ntohl(nbr
->crypt_seqnum
) > ntohl(ospfh
->u
.crypt
.crypt_seqnum
)) {
355 "interface %s: ospf_check_md5 bad sequence %d (expect %d)",
356 IF_NAME(oi
), ntohl(ospfh
->u
.crypt
.crypt_seqnum
),
357 ntohl(nbr
->crypt_seqnum
));
361 /* Generate a digest for the ospf packet - their digest + our digest. */
362 memset(&ctx
, 0, sizeof(ctx
));
364 MD5Update(&ctx
, ospfh
, length
);
365 MD5Update(&ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
366 MD5Final(digest
, &ctx
);
368 /* compare the two */
369 if (memcmp((caddr_t
)ospfh
+ length
, digest
, OSPF_AUTH_MD5_SIZE
)) {
370 zlog_warn("interface %s: ospf_check_md5 checksum mismatch",
375 /* save neighbor's crypt_seqnum */
377 nbr
->crypt_seqnum
= ospfh
->u
.crypt
.crypt_seqnum
;
381 /* This function is called from ospf_write(), it will detect the
382 authentication scheme and if it is MD5, it will change the sequence
383 and update the MD5 digest. */
384 static int ospf_make_md5_digest(struct ospf_interface
*oi
,
385 struct ospf_packet
*op
)
387 struct ospf_header
*ospfh
;
388 unsigned char digest
[OSPF_AUTH_MD5_SIZE
] = {0};
392 struct crypt_key
*ck
;
393 const uint8_t *auth_key
;
395 ibuf
= STREAM_DATA(op
->s
);
396 ospfh
= (struct ospf_header
*)ibuf
;
398 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
401 /* We do this here so when we dup a packet, we don't have to
402 waste CPU rewriting other headers.
404 Note that quagga_time /deliberately/ is not used here */
405 t
= (time(NULL
) & 0xFFFFFFFF);
406 if (t
> oi
->crypt_seqnum
)
407 oi
->crypt_seqnum
= t
;
411 ospfh
->u
.crypt
.crypt_seqnum
= htonl(oi
->crypt_seqnum
);
413 /* Get MD5 Authentication key from auth_key list. */
414 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
415 auth_key
= (const uint8_t *)digest
;
417 ck
= listgetdata(listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
418 auth_key
= ck
->auth_key
;
421 /* Generate a digest for the entire packet + our secret key. */
422 memset(&ctx
, 0, sizeof(ctx
));
424 MD5Update(&ctx
, ibuf
, ntohs(ospfh
->length
));
425 MD5Update(&ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
426 MD5Final(digest
, &ctx
);
428 /* Append md5 digest to the end of the stream. */
429 stream_put(op
->s
, digest
, OSPF_AUTH_MD5_SIZE
);
431 /* We do *NOT* increment the OSPF header length. */
432 op
->length
= ntohs(ospfh
->length
) + OSPF_AUTH_MD5_SIZE
;
434 if (stream_get_endp(op
->s
) != op
->length
)
437 "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u",
438 (unsigned long)stream_get_endp(op
->s
), op
->length
);
440 return OSPF_AUTH_MD5_SIZE
;
444 static int ospf_ls_req_timer(struct thread
*thread
)
446 struct ospf_neighbor
*nbr
;
448 nbr
= THREAD_ARG(thread
);
449 nbr
->t_ls_req
= NULL
;
451 /* Send Link State Request. */
452 if (ospf_ls_request_count(nbr
))
453 ospf_ls_req_send(nbr
);
455 /* Set Link State Request retransmission timer. */
456 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
461 void ospf_ls_req_event(struct ospf_neighbor
*nbr
)
464 thread_cancel(nbr
->t_ls_req
);
465 nbr
->t_ls_req
= NULL
;
467 nbr
->t_ls_req
= NULL
;
468 thread_add_event(master
, ospf_ls_req_timer
, nbr
, 0, &nbr
->t_ls_req
);
471 /* Cyclic timer function. Fist registered in ospf_nbr_new () in
473 int ospf_ls_upd_timer(struct thread
*thread
)
475 struct ospf_neighbor
*nbr
;
477 nbr
= THREAD_ARG(thread
);
478 nbr
->t_ls_upd
= NULL
;
480 /* Send Link State Update. */
481 if (ospf_ls_retransmit_count(nbr
) > 0) {
483 struct ospf_lsdb
*lsdb
;
485 int retransmit_interval
;
487 retransmit_interval
=
488 OSPF_IF_PARAM(nbr
->oi
, retransmit_interval
);
490 lsdb
= &nbr
->ls_rxmt
;
493 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
494 struct route_table
*table
= lsdb
->type
[i
].db
;
495 struct route_node
*rn
;
497 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
498 struct ospf_lsa
*lsa
;
500 if ((lsa
= rn
->info
) != NULL
) {
501 /* Don't retransmit an LSA if we
503 the last RxmtInterval seconds - this
505 neighbour a chance to acknowledge the
507 have ben just received before the
509 fired. This is a small tweak to what
511 but it will cut out out a lot of
514 if (monotime_since(&lsa
->tv_recv
, NULL
)
515 >= retransmit_interval
* 1000000LL)
516 listnode_add(update
, rn
->info
);
521 if (listcount(update
) > 0)
522 ospf_ls_upd_send(nbr
, update
, OSPF_SEND_PACKET_DIRECT
,
524 list_delete_and_null(&update
);
527 /* Set LS Update retransmission timer. */
528 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
, nbr
->v_ls_upd
);
533 int ospf_ls_ack_timer(struct thread
*thread
)
535 struct ospf_interface
*oi
;
537 oi
= THREAD_ARG(thread
);
540 /* Send Link State Acknowledgment. */
541 if (listcount(oi
->ls_ack
) > 0)
542 ospf_ls_ack_send_delayed(oi
);
544 /* Set LS Ack timer. */
545 OSPF_ISM_TIMER_ON(oi
->t_ls_ack
, ospf_ls_ack_timer
, oi
->v_ls_ack
);
550 #ifdef WANT_OSPF_WRITE_FRAGMENT
551 static void ospf_write_frags(int fd
, struct ospf_packet
*op
, struct ip
*iph
,
552 struct msghdr
*msg
, unsigned int maxdatasize
,
553 unsigned int mtu
, int flags
, uint8_t type
)
555 #define OSPF_WRITE_FRAG_SHIFT 3
560 assert(op
->length
== stream_get_endp(op
->s
));
561 assert(msg
->msg_iovlen
== 2);
565 * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
566 * well as the IP_MF flag, making this all quite pointless.
568 * However, for a system on which IP_MF is left alone, and ip_id left
569 * alone or else which sets same ip_id for each fragment this might
572 * XXX-TODO: It would be much nicer to have the kernel's use their
573 * existing fragmentation support to do this for us. Bugs/RFEs need to
574 * be raised against the various kernels.
578 iph
->ip_off
|= IP_MF
;
580 /* ip frag offset is expressed in units of 8byte words */
581 offset
= maxdatasize
>> OSPF_WRITE_FRAG_SHIFT
;
583 iovp
= &msg
->msg_iov
[1];
585 while ((stream_get_endp(op
->s
) - stream_get_getp(op
->s
))
587 /* data length of this frag is to next offset value */
588 iovp
->iov_len
= offset
<< OSPF_WRITE_FRAG_SHIFT
;
589 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
590 assert(iph
->ip_len
<= mtu
);
592 sockopt_iphdrincl_swab_htosys(iph
);
594 ret
= sendmsg(fd
, msg
, flags
);
596 sockopt_iphdrincl_swab_systoh(iph
);
600 "*** ospf_write_frags: sendmsg failed to %s,"
601 " id %d, off %d, len %d, mtu %u failed with %s",
602 inet_ntoa(iph
->ip_dst
), iph
->ip_id
, iph
->ip_off
,
603 iph
->ip_len
, mtu
, safe_strerror(errno
));
605 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
607 "ospf_write_frags: sent id %d, off %d, len %d to %s\n",
608 iph
->ip_id
, iph
->ip_off
, iph
->ip_len
,
609 inet_ntoa(iph
->ip_dst
));
610 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
612 "-----------------IP Header Dump----------------------");
613 ospf_ip_header_dump(iph
);
615 "-----------------------------------------------------");
619 iph
->ip_off
+= offset
;
620 stream_forward_getp(op
->s
, iovp
->iov_len
);
621 iovp
->iov_base
= stream_pnt(op
->s
);
624 /* setup for final fragment */
625 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
626 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
627 iph
->ip_off
&= (~IP_MF
);
629 #endif /* WANT_OSPF_WRITE_FRAGMENT */
631 static int ospf_write(struct thread
*thread
)
633 struct ospf
*ospf
= THREAD_ARG(thread
);
634 struct ospf_interface
*oi
;
635 struct ospf_interface
*last_serviced_oi
= NULL
;
636 struct ospf_packet
*op
;
637 struct sockaddr_in sa_dst
;
644 struct listnode
*node
;
645 #ifdef WANT_OSPF_WRITE_FRAGMENT
646 static uint16_t ipid
= 0;
647 uint16_t maxdatasize
;
648 #endif /* WANT_OSPF_WRITE_FRAGMENT */
649 #define OSPF_WRITE_IPHL_SHIFT 2
653 unsigned char cmsgbuf
[64] = {};
654 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
655 struct in_pktinfo
*pi
;
658 ospf
->t_write
= NULL
;
660 node
= listhead(ospf
->oi_write_q
);
662 oi
= listgetdata(node
);
665 #ifdef WANT_OSPF_WRITE_FRAGMENT
666 /* seed ipid static with low order bits of time */
668 ipid
= (time(NULL
) & 0xffff);
669 #endif /* WANT_OSPF_WRITE_FRAGMENT */
671 while ((pkt_count
< ospf
->write_oi_count
) && oi
672 && (last_serviced_oi
!= oi
)) {
673 /* If there is only packet in the queue, the oi is removed from
674 write-q, so fix up the last interface that was serviced */
675 if (last_serviced_oi
== NULL
) {
676 last_serviced_oi
= oi
;
679 #ifdef WANT_OSPF_WRITE_FRAGMENT
680 /* convenience - max OSPF data per packet */
681 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
682 #endif /* WANT_OSPF_WRITE_FRAGMENT */
683 /* Get one packet from queue. */
684 op
= ospf_fifo_head(oi
->obuf
);
686 assert(op
->length
>= OSPF_HEADER_SIZE
);
688 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
689 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
690 ospf_if_ipmulticast(ospf
, oi
->address
,
693 /* Rewrite the md5 signature & update the seq */
694 ospf_make_md5_digest(oi
, op
);
696 /* Retrieve OSPF packet type. */
697 stream_set_getp(op
->s
, 1);
698 type
= stream_getc(op
->s
);
700 /* reset get pointer */
701 stream_set_getp(op
->s
, 0);
703 memset(&iph
, 0, sizeof(struct ip
));
704 memset(&sa_dst
, 0, sizeof(sa_dst
));
706 sa_dst
.sin_family
= AF_INET
;
707 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
708 sa_dst
.sin_len
= sizeof(sa_dst
);
709 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
710 sa_dst
.sin_addr
= op
->dst
;
711 sa_dst
.sin_port
= htons(0);
713 /* Set DONTROUTE flag if dst is unicast. */
714 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
715 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
716 flags
= MSG_DONTROUTE
;
718 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
719 /* it'd be very strange for header to not be 4byte-word aligned
721 if (sizeof(struct ip
)
722 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
723 iph
.ip_hl
++; /* we presume sizeof struct ip cant
726 iph
.ip_v
= IPVERSION
;
727 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
728 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
730 #if defined(__DragonFly__)
732 * DragonFly's raw socket expects ip_len/ip_off in network byte
735 iph
.ip_len
= htons(iph
.ip_len
);
738 #ifdef WANT_OSPF_WRITE_FRAGMENT
739 /* XXX-MT: not thread-safe at all..
740 * XXX: this presumes this is only programme sending OSPF
742 * otherwise, no guarantee ipid will be unique
745 #endif /* WANT_OSPF_WRITE_FRAGMENT */
748 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
749 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
751 iph
.ip_ttl
= OSPF_IP_TTL
;
752 iph
.ip_p
= IPPROTO_OSPFIGP
;
754 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
755 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
757 memset(&msg
, 0, sizeof(msg
));
758 msg
.msg_name
= (caddr_t
)&sa_dst
;
759 msg
.msg_namelen
= sizeof(sa_dst
);
763 iov
[0].iov_base
= (char *)&iph
;
764 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
765 iov
[1].iov_base
= stream_pnt(op
->s
);
766 iov
[1].iov_len
= op
->length
;
769 msg
.msg_control
= (caddr_t
)cm
;
770 cm
->cmsg_level
= SOL_IP
;
771 cm
->cmsg_type
= IP_PKTINFO
;
772 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
773 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
774 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
776 msg
.msg_controllen
= cm
->cmsg_len
;
779 /* Sadly we can not rely on kernels to fragment packets
780 * because of either IP_HDRINCL and/or multicast
781 * destination being set.
784 #ifdef WANT_OSPF_WRITE_FRAGMENT
785 if (op
->length
> maxdatasize
)
786 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
787 oi
->ifp
->mtu
, flags
, type
);
788 #endif /* WANT_OSPF_WRITE_FRAGMENT */
790 /* send final fragment (could be first) */
791 sockopt_iphdrincl_swab_htosys(&iph
);
792 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
793 sockopt_iphdrincl_swab_systoh(&iph
);
794 if (IS_DEBUG_OSPF_EVENT
)
797 "id %d, off %d, len %d, interface %s, mtu %u:",
798 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
799 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
803 "*** sendmsg in ospf_write failed to %s, "
804 "id %d, off %d, len %d, interface %s, mtu %u: %s",
805 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
806 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
807 safe_strerror(errno
));
809 /* Show debug sending packet. */
810 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
811 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
813 "-----------------------------------------------------");
814 ospf_ip_header_dump(&iph
);
815 stream_set_getp(op
->s
, 0);
816 ospf_packet_dump(op
->s
);
819 zlog_debug("%s sent to [%s] via [%s].",
820 lookup_msg(ospf_packet_type_str
, type
, NULL
),
821 inet_ntoa(op
->dst
), IF_NAME(oi
));
823 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
825 "-----------------------------------------------------");
832 case OSPF_MSG_DB_DESC
:
835 case OSPF_MSG_LS_REQ
:
838 case OSPF_MSG_LS_UPD
:
841 case OSPF_MSG_LS_ACK
:
848 /* Now delete packet from queue. */
849 ospf_packet_delete(oi
);
851 /* Move this interface to the tail of write_q to
852 serve everyone in a round robin fashion */
853 list_delete_node(ospf
->oi_write_q
, node
);
854 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
856 last_serviced_oi
= NULL
;
859 listnode_add(ospf
->oi_write_q
, oi
);
862 /* Setup to service from the head of the queue again */
863 if (!list_isempty(ospf
->oi_write_q
)) {
864 node
= listhead(ospf
->oi_write_q
);
866 oi
= listgetdata(node
);
871 /* If packets still remain in queue, call write thread. */
872 if (!list_isempty(ospf
->oi_write_q
)) {
873 ospf
->t_write
= NULL
;
874 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
881 /* OSPF Hello message read -- RFC2328 Section 10.5. */
882 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
883 struct stream
*s
, struct ospf_interface
*oi
, int size
)
885 struct ospf_hello
*hello
;
886 struct ospf_neighbor
*nbr
;
890 /* increment statistics. */
893 hello
= (struct ospf_hello
*)stream_pnt(s
);
895 /* If Hello is myself, silently discard. */
896 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
897 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
899 "ospf_header[%s/%s]: selforiginated, "
901 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
903 inet_ntoa(iph
->ip_src
));
908 /* get neighbor prefix. */
910 p
.prefixlen
= ip_masklen(hello
->network_mask
);
911 p
.u
.prefix4
= iph
->ip_src
;
913 /* Compare network mask. */
914 /* Checking is ignored for Point-to-Point and Virtual link. */
915 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
916 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
917 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
919 "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
920 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
),
921 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
925 /* Compare Router Dead Interval. */
926 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
928 "Packet %s [Hello:RECV]: RouterDeadInterval mismatch "
929 "(expected %u, but received %u).",
930 inet_ntoa(ospfh
->router_id
), OSPF_IF_PARAM(oi
, v_wait
),
931 ntohl(hello
->dead_interval
));
935 /* Compare Hello Interval - ignored if fast-hellos are set. */
936 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
937 if (OSPF_IF_PARAM(oi
, v_hello
)
938 != ntohs(hello
->hello_interval
)) {
940 "Packet %s [Hello:RECV]: HelloInterval mismatch "
941 "(expected %u, but received %u).",
942 inet_ntoa(ospfh
->router_id
),
943 OSPF_IF_PARAM(oi
, v_hello
),
944 ntohs(hello
->hello_interval
));
949 if (IS_DEBUG_OSPF_EVENT
)
950 zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s",
951 inet_ntoa(ospfh
->router_id
),
952 ospf_options_dump(hello
->options
),
953 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
955 /* Compare options. */
956 #define REJECT_IF_TBIT_ON 1 /* XXX */
957 #ifdef REJECT_IF_TBIT_ON
958 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
960 * This router does not support non-zero TOS.
961 * Drop this Hello packet not to establish neighbor
964 zlog_warn("Packet %s [Hello:RECV]: T-bit on, drop it.",
965 inet_ntoa(ospfh
->router_id
));
968 #endif /* REJECT_IF_TBIT_ON */
970 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
971 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
973 * This router does know the correct usage of O-bit
974 * the bit should be set in DD packet only.
976 zlog_warn("Packet %s [Hello:RECV]: O-bit abuse?",
977 inet_ntoa(ospfh
->router_id
));
978 #ifdef STRICT_OBIT_USAGE_CHECK
979 return; /* Reject this packet. */
980 #else /* STRICT_OBIT_USAGE_CHECK */
981 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
982 #endif /* STRICT_OBIT_USAGE_CHECK */
985 /* new for NSSA is to ensure that NP is on and E is off */
987 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
988 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
989 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
990 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
991 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
993 "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x",
994 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
998 if (IS_DEBUG_OSPF_NSSA
)
999 zlog_debug("NSSA-Hello:RECV:Packet from %s:",
1000 inet_ntoa(ospfh
->router_id
));
1002 /* The setting of the E-bit found in the Hello Packet's Options
1003 field must match this area's ExternalRoutingCapability A
1004 mismatch causes processing to stop and the packet to be
1005 dropped. The setting of the rest of the bits in the Hello
1006 Packet's Options field should be ignored. */
1007 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1008 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1010 "Packet %s [Hello:RECV]: my options: %x, his options %x",
1011 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1016 /* get neighbour struct */
1017 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1019 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1022 old_state
= nbr
->state
;
1024 /* Add event to thread. */
1025 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1027 /* RFC2328 Section 9.5.1
1028 If the router is not eligible to become Designated Router,
1029 (snip) It must also send an Hello Packet in reply to an
1030 Hello Packet received from any eligible neighbor (other than
1031 the current Designated Router and Backup Designated Router). */
1032 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1033 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1034 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1035 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1036 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1037 ospf_hello_reply_timer
,
1038 OSPF_HELLO_REPLY_DELAY
);
1040 /* on NBMA network type, it happens to receive bidirectional Hello
1042 without advance 1-Way Received event.
1043 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1044 if (oi
->type
== OSPF_IFTYPE_NBMA
1045 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1046 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1047 nbr
->priority
= hello
->priority
;
1048 nbr
->d_router
= hello
->d_router
;
1049 nbr
->bd_router
= hello
->bd_router
;
1053 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1054 size
- OSPF_HELLO_MIN_SIZE
)) {
1055 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1056 nbr
->options
|= hello
->options
;
1058 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1059 /* Set neighbor information. */
1060 nbr
->priority
= hello
->priority
;
1061 nbr
->d_router
= hello
->d_router
;
1062 nbr
->bd_router
= hello
->bd_router
;
1066 /* If neighbor itself declares DR and no BDR exists,
1067 cause event BackupSeen */
1068 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1069 if (hello
->bd_router
.s_addr
== 0 && oi
->state
== ISM_Waiting
)
1070 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1072 /* neighbor itself declares BDR. */
1073 if (oi
->state
== ISM_Waiting
1074 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
))
1075 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1077 /* had not previously. */
1078 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1079 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1080 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1081 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->d_router
)))
1082 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1084 /* had not previously. */
1085 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1086 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1087 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1088 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
)))
1089 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1091 /* Neighbor priority check. */
1092 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1093 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1095 /* Set neighbor information. */
1096 nbr
->priority
= hello
->priority
;
1097 nbr
->d_router
= hello
->d_router
;
1098 nbr
->bd_router
= hello
->bd_router
;
1101 /* Save DD flags/options/Seqnum received. */
1102 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1103 struct ospf_db_desc
*dd
)
1105 nbr
->last_recv
.flags
= dd
->flags
;
1106 nbr
->last_recv
.options
= dd
->options
;
1107 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1110 /* Process rest of DD packet. */
1111 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1112 struct ospf_neighbor
*nbr
,
1113 struct ospf_db_desc
*dd
, uint16_t size
)
1115 struct ospf_lsa
*new, *find
;
1116 struct lsa_header
*lsah
;
1118 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1119 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1120 size
-= OSPF_LSA_HEADER_SIZE
) {
1121 lsah
= (struct lsa_header
*)stream_pnt(s
);
1122 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1124 /* Unknown LS type. */
1125 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1126 zlog_warn("Packet [DD:RECV]: Unknown LS type %d.",
1128 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1132 if (IS_OPAQUE_LSA(lsah
->type
)
1133 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1134 zlog_warn("LSA[Type%d:%s]: Opaque capability mismatch?",
1135 lsah
->type
, inet_ntoa(lsah
->id
));
1136 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1140 switch (lsah
->type
) {
1141 case OSPF_AS_EXTERNAL_LSA
:
1142 case OSPF_OPAQUE_AS_LSA
:
1143 /* Check for stub area. Reject if AS-External from stub
1145 allow if from NSSA. */
1146 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1148 "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.",
1149 lsah
->type
, inet_ntoa(lsah
->id
),
1150 (oi
->area
->external_routing
1154 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1155 NSM_SeqNumberMismatch
);
1163 /* Create LS-request object. */
1164 new = ospf_ls_request_new(lsah
);
1166 /* Lookup received LSA, then add LS request list. */
1167 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1169 /* ospf_lsa_more_recent is fine with NULL pointers */
1170 switch (ospf_lsa_more_recent(find
, new)) {
1172 /* Neighbour has a more recent LSA, we must request it
1174 ospf_ls_request_add(nbr
, new);
1177 /* If we have a copy of this LSA, it's either less
1179 * and we're requesting it from neighbour (the case
1181 * it's as recent and we both have same copy (this
1184 * In neither of these two cases is there any point in
1185 * describing our copy of the LSA to the neighbour in a
1186 * DB-Summary packet, if we're still intending to do so.
1188 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1189 * backward compatible optimisation to OSPF DB Exchange
1191 * DB Description process implemented here.
1194 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1195 ospf_lsa_discard(new);
1198 /* We have the more recent copy, nothing specific to do:
1199 * - no need to request neighbours stale copy
1200 * - must leave DB summary list copy alone
1202 if (IS_DEBUG_OSPF_EVENT
)
1204 "Packet [DD:RECV]: LSA received Type %d, "
1205 "ID %s is not recent.",
1206 lsah
->type
, inet_ntoa(lsah
->id
));
1207 ospf_lsa_discard(new);
1212 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1215 /* Both sides have no More, then we're done with Exchange */
1216 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1217 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1219 ospf_db_desc_send(nbr
);
1223 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1225 /* Send DD packet in reply.
1227 * Must be done to acknowledge the Master's DD, regardless of
1228 * whether we have more LSAs ourselves to describe.
1230 * This function will clear the 'More' bit, if after this DD
1231 * we have no more LSAs to describe to the master..
1233 ospf_db_desc_send(nbr
);
1235 /* Slave can raise ExchangeDone now, if master is also done */
1236 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1237 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1240 /* Save received neighbor values from DD. */
1241 ospf_db_desc_save_current(nbr
, dd
);
1244 ospf_ls_req_send(nbr
);
1247 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1248 struct ospf_neighbor
*nbr
)
1250 /* Is DD duplicated? */
1251 if (dd
->options
== nbr
->last_recv
.options
1252 && dd
->flags
== nbr
->last_recv
.flags
1253 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1259 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1260 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1261 struct stream
*s
, struct ospf_interface
*oi
,
1264 struct ospf_db_desc
*dd
;
1265 struct ospf_neighbor
*nbr
;
1267 /* Increment statistics. */
1270 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1272 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1274 zlog_warn("Packet[DD]: Unknown Neighbor %s",
1275 inet_ntoa(ospfh
->router_id
));
1280 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1281 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1283 "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u",
1284 inet_ntoa(nbr
->router_id
), ntohs(dd
->mtu
), IF_NAME(oi
),
1290 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1292 * required. In fact at least JunOS sends DD packets with P bit clear.
1293 * Until proper solution is developped, this hack should help.
1295 * Update: According to the RFCs, N bit is specified /only/ for Hello
1296 * options, unfortunately its use in DD options is not specified. Hence
1298 * implementations follow E-bit semantics and set it in DD options, and
1300 * treat it as unspecified and hence follow the directive "default for
1301 * options is clear", ie unset.
1303 * Reset the flag, as ospfd follows E-bit semantics.
1305 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1306 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1307 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1308 if (IS_DEBUG_OSPF_EVENT
)
1310 "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options",
1311 inet_ntoa(nbr
->router_id
));
1312 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1315 #ifdef REJECT_IF_TBIT_ON
1316 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1318 * In Hello protocol, optional capability must have checked
1319 * to prevent this T-bit enabled router be my neighbor.
1321 zlog_warn("Packet[DD]: Neighbor %s: T-bit on?",
1322 inet_ntoa(nbr
->router_id
));
1325 #endif /* REJECT_IF_TBIT_ON */
1327 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1328 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1330 * This node is not configured to handle O-bit, for now.
1331 * Clear it to ignore unsupported capability proposed by
1334 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1337 /* Add event to thread. */
1338 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1340 /* Process DD packet by neighbor status. */
1341 switch (nbr
->state
) {
1346 "Packet[DD]: Neighbor %s state is %s, packet discarded.",
1347 inet_ntoa(nbr
->router_id
),
1348 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1351 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1352 /* If the new state is ExStart, the processing of the current
1353 packet should then continue in this new state by falling
1354 through to case ExStart below. */
1355 if (nbr
->state
!= NSM_ExStart
)
1360 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1361 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1362 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1364 /* We're Slave---obey */
1365 if (CHECK_FLAG(oi
->ospf
->config
,
1366 OSPF_LOG_ADJACENCY_DETAIL
))
1368 "Packet[DD]: Neighbor %s Negotiation done (Slave).",
1369 inet_ntoa(nbr
->router_id
));
1371 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1374 UNSET_FLAG(nbr
->dd_flags
,
1375 (OSPF_DD_FLAG_MS
| OSPF_DD_FLAG_I
));
1377 /* We're Master, ignore the initial DBD from
1379 if (CHECK_FLAG(oi
->ospf
->config
,
1380 OSPF_LOG_ADJACENCY_DETAIL
))
1382 "Packet[DD]: Neighbor %s: Initial DBD from Slave, "
1384 inet_ntoa(nbr
->router_id
));
1388 /* Ack from the Slave */
1389 else if (!IS_SET_DD_MS(dd
->flags
) && !IS_SET_DD_I(dd
->flags
)
1390 && ntohl(dd
->dd_seqnum
) == nbr
->dd_seqnum
1391 && IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1394 "Packet[DD]: Neighbor %s Negotiation done (Master).",
1395 inet_ntoa(nbr
->router_id
));
1396 /* Reset I, leaving MS */
1397 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_I
);
1399 zlog_warn("Packet[DD]: Neighbor %s Negotiation fails.",
1400 inet_ntoa(nbr
->router_id
));
1404 /* This is where the real Options are saved */
1405 nbr
->options
= dd
->options
;
1407 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1408 if (IS_DEBUG_OSPF_EVENT
)
1410 "Neighbor[%s] is %sOpaque-capable.",
1411 inet_ntoa(nbr
->router_id
),
1412 CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1416 if (!CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)
1417 && IPV4_ADDR_SAME(&DR(oi
),
1418 &nbr
->address
.u
.prefix4
)) {
1420 "DR-neighbor[%s] is NOT opaque-capable; "
1421 "Opaque-LSAs cannot be reliably advertised "
1423 inet_ntoa(nbr
->router_id
));
1424 /* This situation is undesirable, but not a real
1429 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_NegotiationDone
);
1431 /* continue processing rest of packet. */
1432 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1435 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1436 if (IS_SET_DD_MS(nbr
->dd_flags
))
1437 /* Master: discard duplicated DD packet. */
1439 "Packet[DD] (Master): Neighbor %s packet duplicated.",
1440 inet_ntoa(nbr
->router_id
));
1442 /* Slave: cause to retransmit the last Database
1446 "Packet[DD] [Slave]: Neighbor %s packet duplicated.",
1447 inet_ntoa(nbr
->router_id
));
1448 ospf_db_desc_resend(nbr
);
1453 /* Otherwise DD packet should be checked. */
1454 /* Check Master/Slave bit mismatch */
1455 if (IS_SET_DD_MS(dd
->flags
)
1456 != IS_SET_DD_MS(nbr
->last_recv
.flags
)) {
1457 zlog_warn("Packet[DD]: Neighbor %s MS-bit mismatch.",
1458 inet_ntoa(nbr
->router_id
));
1459 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1460 if (IS_DEBUG_OSPF_EVENT
)
1462 "Packet[DD]: dd->flags=%d, nbr->dd_flags=%d",
1463 dd
->flags
, nbr
->dd_flags
);
1467 /* Check initialize bit is set. */
1468 if (IS_SET_DD_I(dd
->flags
)) {
1469 zlog_info("Packet[DD]: Neighbor %s I-bit set.",
1470 inet_ntoa(nbr
->router_id
));
1471 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1475 /* Check DD Options. */
1476 if (dd
->options
!= nbr
->options
) {
1477 #ifdef ORIGINAL_CODING
1478 /* Save the new options for debugging */
1479 nbr
->options
= dd
->options
;
1480 #endif /* ORIGINAL_CODING */
1481 zlog_warn("Packet[DD]: Neighbor %s options mismatch.",
1482 inet_ntoa(nbr
->router_id
));
1483 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1487 /* Check DD sequence number. */
1488 if ((IS_SET_DD_MS(nbr
->dd_flags
)
1489 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
)
1490 || (!IS_SET_DD_MS(nbr
->dd_flags
)
1491 && ntohl(dd
->dd_seqnum
) != nbr
->dd_seqnum
+ 1)) {
1493 "Packet[DD]: Neighbor %s sequence number mismatch.",
1494 inet_ntoa(nbr
->router_id
));
1495 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1499 /* Continue processing rest of packet. */
1500 ospf_db_desc_proc(s
, oi
, nbr
, dd
, size
);
1504 if (ospf_db_desc_is_dup(dd
, nbr
)) {
1505 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1506 /* Master should discard duplicate DD packet. */
1508 "Packet[DD]: Neighbor %s duplicated, "
1509 "packet discarded.",
1510 inet_ntoa(nbr
->router_id
));
1513 if (monotime_since(&nbr
->last_send_ts
, NULL
)
1514 < nbr
->v_inactivity
* 1000000LL) {
1515 /* In states Loading and Full the slave
1517 its last Database Description packet
1519 duplicate Database Description
1521 from the master. For this reason the
1523 wait RouterDeadInterval seconds
1525 last Database Description packet.
1527 Database Description packet from the
1529 this interval will generate a
1531 neighbor event. RFC2328 Section 10.8
1533 ospf_db_desc_resend(nbr
);
1539 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1542 zlog_warn("Packet[DD]: Neighbor %s NSM illegal status %u.",
1543 inet_ntoa(nbr
->router_id
), nbr
->state
);
1548 #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */
1550 /* OSPF Link State Request Read -- RFC2328 Section 10.7. */
1551 static void ospf_ls_req(struct ip
*iph
, struct ospf_header
*ospfh
,
1552 struct stream
*s
, struct ospf_interface
*oi
,
1555 struct ospf_neighbor
*nbr
;
1557 struct in_addr ls_id
;
1558 struct in_addr adv_router
;
1559 struct ospf_lsa
*find
;
1560 struct list
*ls_upd
;
1561 unsigned int length
;
1563 /* Increment statistics. */
1566 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1568 zlog_warn("Link State Request: Unknown Neighbor %s.",
1569 inet_ntoa(ospfh
->router_id
));
1573 /* Add event to thread. */
1574 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1576 /* Neighbor State should be Exchange or later. */
1577 if (nbr
->state
!= NSM_Exchange
&& nbr
->state
!= NSM_Loading
1578 && nbr
->state
!= NSM_Full
) {
1580 "Link State Request received from %s: "
1581 "Neighbor state is %s, packet discarded.",
1582 inet_ntoa(ospfh
->router_id
),
1583 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1587 /* Send Link State Update for ALL requested LSAs. */
1588 ls_upd
= list_new();
1589 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1591 while (size
>= OSPF_LSA_KEY_SIZE
) {
1592 /* Get one slice of Link State Request. */
1593 ls_type
= stream_getl(s
);
1594 ls_id
.s_addr
= stream_get_ipv4(s
);
1595 adv_router
.s_addr
= stream_get_ipv4(s
);
1597 /* Verify LSA type. */
1598 if (ls_type
< OSPF_MIN_LSA
|| ls_type
>= OSPF_MAX_LSA
) {
1599 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1600 list_delete_and_null(&ls_upd
);
1604 /* Search proper LSA in LSDB. */
1605 find
= ospf_lsa_lookup(oi
->ospf
, oi
->area
, ls_type
, ls_id
,
1608 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
1609 list_delete_and_null(&ls_upd
);
1613 /* Packet overflows MTU size, send immediately. */
1614 if (length
+ ntohs(find
->data
->length
) > ospf_packet_max(oi
)) {
1615 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1616 ospf_ls_upd_send(nbr
, ls_upd
,
1617 OSPF_SEND_PACKET_DIRECT
, 0);
1619 ospf_ls_upd_send(nbr
, ls_upd
,
1620 OSPF_SEND_PACKET_INDIRECT
, 0);
1622 /* Only remove list contents. Keep ls_upd. */
1623 list_delete_all_node(ls_upd
);
1625 length
= OSPF_HEADER_SIZE
+ OSPF_LS_UPD_MIN_SIZE
;
1628 /* Append LSA to update list. */
1629 listnode_add(ls_upd
, find
);
1630 length
+= ntohs(find
->data
->length
);
1632 size
-= OSPF_LSA_KEY_SIZE
;
1635 /* Send rest of Link State Update. */
1636 if (listcount(ls_upd
) > 0) {
1637 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1638 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_DIRECT
,
1641 ospf_ls_upd_send(nbr
, ls_upd
, OSPF_SEND_PACKET_INDIRECT
,
1644 list_delete_and_null(&ls_upd
);
1646 list_delete_and_null(&ls_upd
);
1649 /* Get the list of LSAs from Link State Update packet.
1650 And process some validation -- RFC2328 Section 13. (1)-(2). */
1651 static struct list
*ospf_ls_upd_list_lsa(struct ospf_neighbor
*nbr
,
1653 struct ospf_interface
*oi
, size_t size
)
1655 uint16_t count
, sum
;
1657 struct lsa_header
*lsah
;
1658 struct ospf_lsa
*lsa
;
1663 count
= stream_getl(s
);
1664 size
-= OSPF_LS_UPD_MIN_SIZE
; /* # LSAs */
1666 for (; size
>= OSPF_LSA_HEADER_SIZE
&& count
> 0;
1667 size
-= length
, stream_forward_getp(s
, length
), count
--) {
1668 lsah
= (struct lsa_header
*)stream_pnt(s
);
1669 length
= ntohs(lsah
->length
);
1671 if (length
> size
) {
1673 "Link State Update: LSA length exceeds packet size.");
1677 /* Validate the LSA's LS checksum. */
1678 sum
= lsah
->checksum
;
1679 if (!ospf_lsa_checksum_valid(lsah
)) {
1680 /* (bug #685) more details in a one-line message make it
1682 * to identify problem source on the one hand and to
1684 * chance to compress repeated messages in syslog on the
1687 "Link State Update: LSA checksum error %x/%x, ID=%s from: nbr %s, router ID %s, adv router %s",
1688 sum
, lsah
->checksum
, inet_ntoa(lsah
->id
),
1689 inet_ntoa(nbr
->src
), inet_ntoa(nbr
->router_id
),
1690 inet_ntoa(lsah
->adv_router
));
1694 /* Examine the LSA's LS type. */
1695 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1696 zlog_warn("Link State Update: Unknown LS type %d",
1702 * What if the received LSA's age is greater than MaxAge?
1703 * Treat it as a MaxAge case -- endo.
1705 if (ntohs(lsah
->ls_age
) > OSPF_LSA_MAXAGE
)
1706 lsah
->ls_age
= htons(OSPF_LSA_MAXAGE
);
1708 if (CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1709 #ifdef STRICT_OBIT_USAGE_CHECK
1710 if ((IS_OPAQUE_LSA(lsah
->type
)
1711 && !CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))
1712 || (!IS_OPAQUE_LSA(lsah
->type
)
1713 && CHECK_FLAG(lsah
->options
, OSPF_OPTION_O
))) {
1715 * This neighbor must know the exact usage of
1717 * the bit will be set in Type-9,10,11 LSAs
1720 zlog_warn("LSA[Type%d:%s]: O-bit abuse?",
1721 lsah
->type
, inet_ntoa(lsah
->id
));
1724 #endif /* STRICT_OBIT_USAGE_CHECK */
1726 /* Do not take in AS External Opaque-LSAs if we are a
1728 if (lsah
->type
== OSPF_OPAQUE_AS_LSA
1729 && nbr
->oi
->area
->external_routing
1730 != OSPF_AREA_DEFAULT
) {
1731 if (IS_DEBUG_OSPF_EVENT
)
1733 "LSA[Type%d:%s]: We are a stub, don't take this LSA.",
1735 inet_ntoa(lsah
->id
));
1738 } else if (IS_OPAQUE_LSA(lsah
->type
)) {
1739 zlog_warn("LSA[Type%d:%s]: Opaque capability mismatch?",
1740 lsah
->type
, inet_ntoa(lsah
->id
));
1744 /* Create OSPF LSA instance. */
1745 lsa
= ospf_lsa_new_and_data(length
);
1747 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
1748 /* We may wish to put some error checking if type NSSA comes in
1749 and area not in NSSA mode */
1750 switch (lsah
->type
) {
1751 case OSPF_AS_EXTERNAL_LSA
:
1752 case OSPF_OPAQUE_AS_LSA
:
1755 case OSPF_OPAQUE_LINK_LSA
:
1756 lsa
->oi
= oi
; /* Remember incoming interface for
1757 flooding control. */
1760 lsa
->area
= oi
->area
;
1764 memcpy(lsa
->data
, lsah
, length
);
1766 if (IS_DEBUG_OSPF_EVENT
)
1768 "LSA[Type%d:%s]: %p new LSA created with Link State Update",
1769 lsa
->data
->type
, inet_ntoa(lsa
->data
->id
),
1771 listnode_add(lsas
, lsa
);
1777 /* Cleanup Update list. */
1778 static void ospf_upd_list_clean(struct list
*lsas
)
1780 struct listnode
*node
, *nnode
;
1781 struct ospf_lsa
*lsa
;
1783 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1784 ospf_lsa_discard(lsa
);
1786 list_delete_and_null(&lsas
);
1789 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1790 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1791 struct ospf_header
*ospfh
, struct stream
*s
,
1792 struct ospf_interface
*oi
, uint16_t size
)
1794 struct ospf_neighbor
*nbr
;
1796 struct listnode
*node
, *nnode
;
1797 struct ospf_lsa
*lsa
= NULL
;
1798 /* unsigned long ls_req_found = 0; */
1800 /* Dis-assemble the stream, update each entry, re-encapsulate for
1803 /* Increment statistics. */
1806 /* Check neighbor. */
1807 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1809 zlog_warn("Link State Update: Unknown Neighbor %s on int: %s",
1810 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
1814 /* Add event to thread. */
1815 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1817 /* Check neighbor state. */
1818 if (nbr
->state
< NSM_Exchange
) {
1819 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1821 "Link State Update: "
1822 "Neighbor[%s] state %s is less than Exchange",
1823 inet_ntoa(ospfh
->router_id
),
1824 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1829 /* Get list of LSAs from Link State Update packet. - Also perorms Stages
1830 * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
1833 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1837 #define DISCARD_LSA(L, N) \
1839 if (IS_DEBUG_OSPF_EVENT) \
1841 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1843 N, (void *)lsa, (int)lsa->data->type); \
1844 ospf_lsa_discard(L); \
1848 /* Process each LSA received in the one packet.
1850 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1851 * text below are from the steps in RFC 2328, Section 13.
1853 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1854 struct ospf_lsa
*ls_ret
, *current
;
1857 if (IS_DEBUG_OSPF_NSSA
) {
1858 char buf1
[INET_ADDRSTRLEN
];
1859 char buf2
[INET_ADDRSTRLEN
];
1860 char buf3
[INET_ADDRSTRLEN
];
1862 zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s",
1864 inet_ntop(AF_INET
, &ospfh
->router_id
, buf1
,
1866 inet_ntop(AF_INET
, &lsa
->data
->id
, buf2
,
1868 inet_ntop(AF_INET
, &lsa
->data
->adv_router
,
1869 buf3
, INET_ADDRSTRLEN
));
1872 listnode_delete(lsas
,
1873 lsa
); /* We don't need it in list anymore */
1875 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1878 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1880 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1883 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1886 /* Do take in Type-7's if we are an NSSA */
1888 /* If we are also an ABR, later translate them to a Type-5
1891 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1892 translate them to a separate Type-5 packet. */
1894 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1895 /* Reject from STUB or NSSA */
1896 if (nbr
->oi
->area
->external_routing
1897 != OSPF_AREA_DEFAULT
) {
1898 if (IS_DEBUG_OSPF_NSSA
)
1900 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1901 DISCARD_LSA(lsa
, 1);
1904 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1905 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1906 if (IS_DEBUG_OSPF_NSSA
)
1908 "Incoming NSSA LSA Discarded: Not NSSA Area");
1909 DISCARD_LSA(lsa
, 2);
1912 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1913 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1914 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1915 &lsa
->data
->adv_router
)) {
1916 char buf1
[INET_ADDRSTRLEN
];
1917 char buf2
[INET_ADDRSTRLEN
];
1918 char buf3
[INET_ADDRSTRLEN
];
1920 flog_err(OSPF_ERR_ROUTER_LSA_MISMATCH
,
1921 "Incoming Router-LSA from %s with "
1922 "Adv-ID[%s] != LS-ID[%s]",
1923 inet_ntop(AF_INET
, &ospfh
->router_id
,
1924 buf1
, INET_ADDRSTRLEN
),
1925 inet_ntop(AF_INET
, &lsa
->data
->id
,
1926 buf2
, INET_ADDRSTRLEN
),
1928 &lsa
->data
->adv_router
,
1929 buf3
, INET_ADDRSTRLEN
));
1931 OSPF_ERR_DOMAIN_CORRUPT
,
1932 "OSPF domain compromised by attack or corruption. "
1933 "Verify correct operation of -ALL- OSPF routers.");
1934 DISCARD_LSA(lsa
, 0);
1937 /* Find the LSA in the current database. */
1939 current
= ospf_lsa_lookup_by_header(oi
->area
, lsa
->data
);
1941 /* (4) If the LSA's LS age is equal to MaxAge, and there is
1943 no instance of the LSA in the router's link state database,
1944 and none of router's neighbors are in states Exchange or
1946 then take the following actions: */
1948 if (IS_LSA_MAXAGE(lsa
) && !current
1949 && ospf_check_nbr_status(oi
->ospf
)) {
1950 /* (4a) Response Link State Acknowledgment. */
1951 ospf_ls_ack_send(nbr
, lsa
);
1953 /* (4b) Discard LSA. */
1954 if (IS_DEBUG_OSPF(lsa
, LSA
)) {
1956 "Link State Update[%s]: LS age is equal to MaxAge.",
1959 DISCARD_LSA(lsa
, 3);
1962 if (IS_OPAQUE_LSA(lsa
->data
->type
)
1963 && IPV4_ADDR_SAME(&lsa
->data
->adv_router
,
1964 &oi
->ospf
->router_id
)) {
1966 * Even if initial flushing seems to be completed, there
1968 * be a case that self-originated LSA with MaxAge still
1970 * in the routing domain.
1971 * Just send an LSAck message to cease retransmission.
1973 if (IS_LSA_MAXAGE(lsa
)) {
1974 zlog_warn("LSA[%s]: Boomerang effect?",
1976 ospf_ls_ack_send(nbr
, lsa
);
1977 ospf_lsa_discard(lsa
);
1979 if (current
!= NULL
&& !IS_LSA_MAXAGE(current
))
1980 ospf_opaque_lsa_refresh_schedule(
1986 * If an instance of self-originated Opaque-LSA is not
1988 * in the LSDB, there are some possible cases here.
1990 * 1) This node lost opaque-capability after restart.
1991 * 2) Else, a part of opaque-type is no more supported.
1992 * 3) Else, a part of opaque-id is no more supported.
1994 * Anyway, it is still this node's responsibility to
1996 * Otherwise, the LSA instance remains in the routing
1998 * until its age reaches to MaxAge.
2000 /* XXX: We should deal with this for *ALL* LSAs, not
2002 if (current
== NULL
) {
2003 if (IS_DEBUG_OSPF_EVENT
)
2005 "LSA[%s]: Previously originated Opaque-LSA,"
2006 "not found in the LSDB.",
2009 SET_FLAG(lsa
->flags
, OSPF_LSA_SELF
);
2011 ospf_opaque_self_originated_lsa_received(nbr
,
2013 ospf_ls_ack_send(nbr
, lsa
);
2019 /* It might be happen that received LSA is self-originated
2021 * router ID is changed. So, we should check if LSA is a
2023 * Link State ID is one of the router's own IP interface
2024 * addresses but whose
2025 * Advertising Router is not equal to the router's own Router ID
2026 * According to RFC 2328 12.4.2 and 13.4 this LSA should be
2030 if (lsa
->data
->type
== OSPF_NETWORK_LSA
) {
2031 struct listnode
*oinode
, *oinnode
;
2032 struct ospf_interface
*out_if
;
2035 for (ALL_LIST_ELEMENTS(oi
->ospf
->oiflist
, oinode
,
2040 if ((IPV4_ADDR_SAME(&out_if
->address
->u
.prefix4
,
2042 && (!(IPV4_ADDR_SAME(
2043 &oi
->ospf
->router_id
,
2044 &lsa
->data
->adv_router
)))) {
2045 if (out_if
->network_lsa_self
) {
2046 ospf_lsa_flush_area(
2048 if (IS_DEBUG_OSPF_EVENT
)
2050 "ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d",
2054 ospf_lsa_discard(lsa
);
2064 /* (5) Find the instance of this LSA that is currently contained
2065 in the router's link state database. If there is no
2066 database copy, or the received LSA is more recent than
2067 the database copy the following steps must be performed.
2068 (The sub steps from RFC 2328 section 13 step (5) will be
2073 || (ret
= ospf_lsa_more_recent(current
, lsa
)) < 0) {
2074 /* Actual flooding procedure. */
2075 if (ospf_flood(oi
->ospf
, nbr
, current
, lsa
)
2076 < 0) /* Trap NSSA later. */
2077 DISCARD_LSA(lsa
, 4);
2081 /* (6) Else, If there is an instance of the LSA on the sending
2082 neighbor's Link state request list, an error has occurred in
2083 the Database Exchange process. In this case, restart the
2084 Database Exchange process by generating the neighbor event
2085 BadLSReq for the sending neighbor and stop processing the
2086 Link State Update packet. */
2088 if (ospf_ls_request_lookup(nbr
, lsa
)) {
2089 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_BadLSReq
);
2091 "LSA[%s] instance exists on Link state request list",
2094 /* Clean list of LSAs. */
2095 ospf_upd_list_clean(lsas
);
2096 /* this lsa is not on lsas list already. */
2097 ospf_lsa_discard(lsa
);
2101 /* If the received LSA is the same instance as the database copy
2102 (i.e., neither one is more recent) the following two steps
2103 should be performed: */
2106 /* If the LSA is listed in the Link state retransmission
2108 for the receiving adjacency, the router itself is
2110 an acknowledgment for this LSA. The router should
2112 received LSA as an acknowledgment by removing the LSA
2114 the Link state retransmission list. This is termed
2116 "implied acknowledgment". */
2118 ls_ret
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2120 if (ls_ret
!= NULL
) {
2121 ospf_ls_retransmit_delete(nbr
, ls_ret
);
2123 /* Delayed acknowledgment sent if advertisement
2125 from Designated Router, otherwise do nothing.
2127 if (oi
->state
== ISM_Backup
)
2131 ospf_lsa_lock(lsa
));
2133 DISCARD_LSA(lsa
, 5);
2135 /* Acknowledge the receipt of the LSA by sending a
2136 Link State Acknowledgment packet back out the
2140 ospf_ls_ack_send(nbr
, lsa
);
2141 DISCARD_LSA(lsa
, 6);
2145 /* The database copy is more recent. If the database copy
2146 has LS age equal to MaxAge and LS sequence number equal to
2147 MaxSequenceNumber, simply discard the received LSA without
2148 acknowledging it. (In this case, the LSA's LS sequence number
2150 wrapping, and the MaxSequenceNumber LSA must be completely
2151 flushed before any new LSA instance can be introduced). */
2153 else if (ret
> 0) /* Database copy is more recent */
2155 if (IS_LSA_MAXAGE(current
)
2156 && current
->data
->ls_seqnum
2157 == htonl(OSPF_MAX_SEQUENCE_NUMBER
)) {
2158 DISCARD_LSA(lsa
, 7);
2160 /* Otherwise, as long as the database copy has not been
2162 Link State Update within the last MinLSArrival
2164 database copy back to the sending neighbor,
2166 a Link State Update Packet. The Link State Update
2168 be sent directly to the neighbor. In so doing, do not
2170 database copy of the LSA on the neighbor's link state
2171 retransmission list, and do not acknowledge the
2173 recent) LSA instance. */
2175 if (monotime_since(¤t
->tv_orig
, NULL
)
2176 >= ospf
->min_ls_arrival
* 1000LL)
2177 /* Trap NSSA type later.*/
2178 ospf_ls_upd_send_lsa(
2180 OSPF_SEND_PACKET_DIRECT
);
2181 DISCARD_LSA(lsa
, 8);
2187 assert(listcount(lsas
) == 0);
2188 list_delete_and_null(&lsas
);
2191 /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */
2192 static void ospf_ls_ack(struct ip
*iph
, struct ospf_header
*ospfh
,
2193 struct stream
*s
, struct ospf_interface
*oi
,
2196 struct ospf_neighbor
*nbr
;
2198 /* increment statistics. */
2201 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
2203 zlog_warn("Link State Acknowledgment: Unknown Neighbor %s.",
2204 inet_ntoa(ospfh
->router_id
));
2208 /* Add event to thread. */
2209 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
2211 if (nbr
->state
< NSM_Exchange
) {
2212 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
2214 "Link State Acknowledgment: "
2215 "Neighbor[%s] state %s is less than Exchange",
2216 inet_ntoa(ospfh
->router_id
),
2217 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
2222 while (size
>= OSPF_LSA_HEADER_SIZE
) {
2223 struct ospf_lsa
*lsa
, *lsr
;
2225 lsa
= ospf_lsa_new();
2226 lsa
->data
= (struct lsa_header
*)stream_pnt(s
);
2227 lsa
->vrf_id
= oi
->ospf
->vrf_id
;
2229 /* lsah = (struct lsa_header *) stream_pnt (s); */
2230 size
-= OSPF_LSA_HEADER_SIZE
;
2231 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
2233 if (lsa
->data
->type
< OSPF_MIN_LSA
2234 || lsa
->data
->type
>= OSPF_MAX_LSA
) {
2236 ospf_lsa_discard(lsa
);
2240 lsr
= ospf_ls_retransmit_lookup(nbr
, lsa
);
2242 if (lsr
!= NULL
&& ospf_lsa_more_recent(lsr
, lsa
) == 0)
2243 ospf_ls_retransmit_delete(nbr
, lsr
);
2246 ospf_lsa_discard(lsa
);
2252 static struct stream
*ospf_recv_packet(struct ospf
*ospf
, int fd
,
2253 struct interface
**ifp
,
2254 struct stream
*ibuf
)
2259 ifindex_t ifindex
= 0;
2261 /* Header and data both require alignment. */
2262 char buff
[CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())];
2265 memset(&msgh
, 0, sizeof(struct msghdr
));
2266 msgh
.msg_iov
= &iov
;
2267 msgh
.msg_iovlen
= 1;
2268 msgh
.msg_control
= (caddr_t
)buff
;
2269 msgh
.msg_controllen
= sizeof(buff
);
2271 ret
= stream_recvmsg(ibuf
, fd
, &msgh
, 0, OSPF_MAX_PACKET_SIZE
+ 1);
2273 zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno
));
2276 if ((unsigned int)ret
< sizeof(iph
)) /* ret must be > 0 now */
2279 "ospf_recv_packet: discarding runt packet of length %d "
2280 "(ip header size is %u)",
2281 ret
, (unsigned int)sizeof(iph
));
2285 /* Note that there should not be alignment problems with this assignment
2286 because this is at the beginning of the stream data buffer. */
2287 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2288 sockopt_iphdrincl_swab_systoh(iph
);
2290 ip_len
= iph
->ip_len
;
2292 #if !defined(GNU_LINUX) && (OpenBSD < 200311) && (__FreeBSD_version < 1000000)
2294 * Kernel network code touches incoming IP header parameters,
2295 * before protocol specific processing.
2297 * 1) Convert byteorder to host representation.
2298 * --> ip_len, ip_id, ip_off
2300 * 2) Adjust ip_len to strip IP header size!
2301 * --> If user process receives entire IP packet via RAW
2302 * socket, it must consider adding IP header size to
2303 * the "ip_len" field of "ip" structure.
2305 * For more details, see <netinet/ip_input.c>.
2307 ip_len
= ip_len
+ (iph
->ip_hl
<< 2);
2310 #if defined(__DragonFly__)
2312 * in DragonFly's raw socket, ip_len/ip_off are read
2313 * in network byte order.
2314 * As OpenBSD < 200311 adjust ip_len to strip IP header size!
2316 ip_len
= ntohs(iph
->ip_len
) + (iph
->ip_hl
<< 2);
2319 ifindex
= getsockopt_ifindex(AF_INET
, &msgh
);
2321 *ifp
= if_lookup_by_index(ifindex
, ospf
->vrf_id
);
2323 if (ret
!= ip_len
) {
2325 "ospf_recv_packet read length mismatch: ip_len is %d, "
2326 "but recvmsg returned %d",
2334 static struct ospf_interface
*
2335 ospf_associate_packet_vl(struct ospf
*ospf
, struct interface
*ifp
,
2336 struct ip
*iph
, struct ospf_header
*ospfh
)
2338 struct ospf_interface
*rcv_oi
;
2339 struct ospf_vl_data
*vl_data
;
2340 struct ospf_area
*vl_area
;
2341 struct listnode
*node
;
2343 if (IN_MULTICAST(ntohl(iph
->ip_dst
.s_addr
))
2344 || !OSPF_IS_AREA_BACKBONE(ospfh
))
2347 /* look for local OSPF interface matching the destination
2348 * to determine Area ID. We presume therefore the destination address
2349 * is unique, or at least (for "unnumbered" links), not used in other
2352 if ((rcv_oi
= ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_dst
))
2356 for (ALL_LIST_ELEMENTS_RO(ospf
->vlinks
, node
, vl_data
)) {
2358 ospf_area_lookup_by_area_id(ospf
, vl_data
->vl_area_id
);
2362 if (OSPF_AREA_SAME(&vl_area
, &rcv_oi
->area
)
2363 && IPV4_ADDR_SAME(&vl_data
->vl_peer
, &ospfh
->router_id
)) {
2364 if (IS_DEBUG_OSPF_EVENT
)
2365 zlog_debug("associating packet with %s",
2366 IF_NAME(vl_data
->vl_oi
));
2367 if (!CHECK_FLAG(vl_data
->vl_oi
->ifp
->flags
, IFF_UP
)) {
2368 if (IS_DEBUG_OSPF_EVENT
)
2370 "This VL is not up yet, sorry");
2374 return vl_data
->vl_oi
;
2378 if (IS_DEBUG_OSPF_EVENT
)
2379 zlog_debug("couldn't find any VL to associate the packet with");
2384 static int ospf_check_area_id(struct ospf_interface
*oi
,
2385 struct ospf_header
*ospfh
)
2387 /* Check match the Area ID of the receiving interface. */
2388 if (OSPF_AREA_SAME(&oi
->area
, &ospfh
))
2394 /* Unbound socket will accept any Raw IP packets if proto is matched.
2395 To prevent it, compare src IP address and i/f address with masking
2396 i/f network mask. */
2397 static int ospf_check_network_mask(struct ospf_interface
*oi
,
2398 struct in_addr ip_src
)
2400 struct in_addr mask
, me
, him
;
2402 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
2403 || oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
2406 masklen2ip(oi
->address
->prefixlen
, &mask
);
2408 me
.s_addr
= oi
->address
->u
.prefix4
.s_addr
& mask
.s_addr
;
2409 him
.s_addr
= ip_src
.s_addr
& mask
.s_addr
;
2411 if (IPV4_ADDR_SAME(&me
, &him
))
2417 /* Return 1, if the packet is properly authenticated and checksummed,
2418 0 otherwise. In particular, check that AuType header field is valid and
2419 matches the locally configured AuType, and that D.5 requirements are met. */
2420 static int ospf_check_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
2422 struct crypt_key
*ck
;
2423 uint16_t iface_auth_type
;
2424 uint16_t pkt_auth_type
= ntohs(ospfh
->auth_type
);
2426 switch (pkt_auth_type
) {
2427 case OSPF_AUTH_NULL
: /* RFC2328 D.5.1 */
2428 if (OSPF_AUTH_NULL
!= (iface_auth_type
= ospf_auth_type(oi
))) {
2429 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2431 "interface %s: auth-type mismatch, local %s, rcvd Null",
2433 lookup_msg(ospf_auth_type_str
,
2434 iface_auth_type
, NULL
));
2437 if (!ospf_check_sum(ospfh
)) {
2438 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2440 "interface %s: Null auth OK, but checksum error, Router-ID %s",
2442 inet_ntoa(ospfh
->router_id
));
2446 case OSPF_AUTH_SIMPLE
: /* RFC2328 D.5.2 */
2447 if (OSPF_AUTH_SIMPLE
2448 != (iface_auth_type
= ospf_auth_type(oi
))) {
2449 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2451 "interface %s: auth-type mismatch, local %s, rcvd Simple",
2453 lookup_msg(ospf_auth_type_str
,
2454 iface_auth_type
, NULL
));
2457 if (memcmp(OSPF_IF_PARAM(oi
, auth_simple
), ospfh
->u
.auth_data
,
2458 OSPF_AUTH_SIMPLE_SIZE
)) {
2459 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2460 zlog_warn("interface %s: Simple auth failed",
2464 if (!ospf_check_sum(ospfh
)) {
2465 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2467 "interface %s: Simple auth OK, checksum error, Router-ID %s",
2469 inet_ntoa(ospfh
->router_id
));
2473 case OSPF_AUTH_CRYPTOGRAPHIC
: /* RFC2328 D.5.3 */
2474 if (OSPF_AUTH_CRYPTOGRAPHIC
2475 != (iface_auth_type
= ospf_auth_type(oi
))) {
2476 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2478 "interface %s: auth-type mismatch, local %s, rcvd Cryptographic",
2480 lookup_msg(ospf_auth_type_str
,
2481 iface_auth_type
, NULL
));
2484 if (ospfh
->checksum
) {
2485 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2487 "interface %s: OSPF header checksum is not 0",
2491 /* only MD5 crypto method can pass ospf_packet_examin() */
2492 if (NULL
== (ck
= listgetdata(
2493 listtail(OSPF_IF_PARAM(oi
, auth_crypt
))))
2494 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2495 /* Condition above uses the last key ID on the list,
2497 different from what ospf_crypt_key_lookup() does. A
2499 !ospf_check_md5_digest(oi
, ospfh
)) {
2500 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2501 zlog_warn("interface %s: MD5 auth failed",
2507 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2509 "interface %s: invalid packet auth-type (%02x)",
2510 IF_NAME(oi
), pkt_auth_type
);
2515 static int ospf_check_sum(struct ospf_header
*ospfh
)
2520 /* clear auth_data for checksum. */
2521 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2523 /* keep checksum and clear. */
2524 sum
= ospfh
->checksum
;
2525 memset(&ospfh
->checksum
, 0, sizeof(uint16_t));
2527 /* calculate checksum. */
2528 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2531 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2539 /* Verify, that given link/TOS records are properly sized/aligned and match
2540 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2541 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2543 const uint16_t num_links
)
2545 unsigned counted_links
= 0, thislinklen
;
2549 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2550 if (thislinklen
> linkbytes
) {
2551 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2552 zlog_debug("%s: length error in link block #%u",
2553 __func__
, counted_links
);
2556 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2557 linkbytes
-= thislinklen
;
2560 if (counted_links
!= num_links
) {
2561 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2562 zlog_debug("%s: %u link blocks declared, %u present",
2563 __func__
, num_links
, counted_links
);
2569 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2570 minimum length constraint). */
2571 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const uint16_t lsalen
,
2572 const uint8_t headeronly
)
2575 struct router_lsa
*rlsa
;
2576 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2577 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2578 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2579 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2580 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2584 switch (lsah
->type
) {
2585 case OSPF_ROUTER_LSA
:
2586 /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1
2587 * (12+)-byte link blocks */
2589 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2590 - OSPF_ROUTER_LSA_MIN_SIZE
)
2596 rlsa
= (struct router_lsa
*)lsah
;
2597 ret
= ospf_router_lsa_links_examin(
2598 (struct router_lsa_link
*)rlsa
->link
,
2599 lsalen
- OSPF_LSA_HEADER_SIZE
- 4, /* skip: basic
2602 ntohs(rlsa
->links
) /* 16 bits */
2605 case OSPF_AS_EXTERNAL_LSA
:
2606 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2608 case OSPF_AS_NSSA_LSA
:
2609 /* RFC3101 C, idem */
2610 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2611 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2616 /* Following LSA types are considered OK length-wise as soon as their
2618 * length constraint is met and length of the whole LSA is a multiple of
2620 * (basic LSA header size is already a multiple of 4). */
2621 case OSPF_NETWORK_LSA
:
2622 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2623 case OSPF_SUMMARY_LSA
:
2624 case OSPF_ASBR_SUMMARY_LSA
:
2625 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2627 case OSPF_OPAQUE_LINK_LSA
:
2628 case OSPF_OPAQUE_AREA_LSA
:
2629 case OSPF_OPAQUE_AS_LSA
:
2630 /* RFC5250 A.2, "some number of octets (of application-specific
2631 * data) padded to 32-bit alignment." This is considered
2633 * to 4-byte alignment of all other LSA types, see
2634 * OSPF-ALIGNMENT.txt
2635 * file for the detailed analysis of this passage. */
2636 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2639 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2640 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2644 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2645 zlog_debug("%s: alignment error in %s", __func__
,
2646 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2650 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2651 includes verification of LSA blocks length/alignment and dispatching
2652 of deeper-level checks. */
2654 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2655 size_t length
, const uint8_t headeronly
,
2656 /* When declared_num_lsas is not 0, compare it to the real
2658 and treat the difference as an error. */
2659 const uint32_t declared_num_lsas
)
2661 uint32_t counted_lsas
= 0;
2665 if (length
< OSPF_LSA_HEADER_SIZE
) {
2666 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2668 "%s: undersized (%zu B) trailing (#%u) LSA header",
2669 __func__
, length
, counted_lsas
);
2672 /* save on ntohs() calls here and in the LSA validator */
2673 lsalen
= ntohs(lsah
->length
);
2674 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2675 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2677 "%s: malformed LSA header #%u, declared length is %u B",
2678 __func__
, counted_lsas
, lsalen
);
2682 /* less checks here and in ospf_lsa_examin() */
2683 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2684 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2686 "%s: malformed header-only LSA #%u",
2687 __func__
, counted_lsas
);
2690 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2691 + OSPF_LSA_HEADER_SIZE
);
2692 length
-= OSPF_LSA_HEADER_SIZE
;
2694 /* make sure the input buffer is deep enough before
2696 if (lsalen
> length
) {
2697 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2699 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2700 __func__
, counted_lsas
, lsalen
,
2704 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2705 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2706 zlog_debug("%s: malformed LSA #%u",
2707 __func__
, counted_lsas
);
2710 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2716 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2717 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2719 "%s: #LSAs declared (%u) does not match actual (%u)",
2720 __func__
, declared_num_lsas
, counted_lsas
);
2726 /* Verify a complete OSPF packet for proper sizing/alignment. */
2727 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2728 const unsigned bytesonwire
)
2730 uint16_t bytesdeclared
, bytesauth
;
2732 struct ospf_ls_update
*lsupd
;
2734 /* Length, 1st approximation. */
2735 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2736 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2737 zlog_debug("%s: undersized (%u B) packet", __func__
,
2741 /* Now it is safe to access header fields. Performing length check,
2743 * for possible extra bytes of crypto auth/padding, which are not
2745 * in the OSPF header "length" field. */
2746 if (oh
->version
!= OSPF_VERSION
) {
2747 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2748 zlog_debug("%s: invalid (%u) protocol version",
2749 __func__
, oh
->version
);
2752 bytesdeclared
= ntohs(oh
->length
);
2753 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2756 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2757 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2759 "%s: unsupported crypto auth length (%u B)",
2760 __func__
, oh
->u
.crypt
.auth_data_len
);
2763 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2765 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2766 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2768 "%s: packet length error (%u real, %u+%u declared)",
2769 __func__
, bytesonwire
, bytesdeclared
,
2773 /* Length, 2nd approximation. The type-specific constraint is checked
2774 against declared length, not amount of bytes on wire. */
2775 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2777 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2778 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2779 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2781 lookup_msg(ospf_packet_type_str
, oh
->type
,
2786 case OSPF_MSG_HELLO
:
2787 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2789 by N>=0 router-IDs. */
2790 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2795 case OSPF_MSG_DB_DESC
:
2796 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2798 by N>=0 header-only LSAs. */
2799 ret
= ospf_lsaseq_examin(
2800 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2801 + OSPF_DB_DESC_MIN_SIZE
),
2802 bytesdeclared
- OSPF_HEADER_SIZE
2803 - OSPF_DB_DESC_MIN_SIZE
,
2804 1, /* header-only LSAs */
2807 case OSPF_MSG_LS_REQ
:
2808 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2809 * request blocks. */
2810 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2815 case OSPF_MSG_LS_UPD
:
2816 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2818 by N>=0 full LSAs (with N declared beforehand). */
2819 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2820 + OSPF_HEADER_SIZE
);
2821 ret
= ospf_lsaseq_examin(
2822 (struct lsa_header
*)((caddr_t
)lsupd
2823 + OSPF_LS_UPD_MIN_SIZE
),
2824 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2826 ntohl(lsupd
->num_lsas
) /* 32 bits */
2829 case OSPF_MSG_LS_ACK
:
2830 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2832 ret
= ospf_lsaseq_examin(
2833 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2834 + OSPF_LS_ACK_MIN_SIZE
),
2835 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2836 1, /* header-only LSAs */
2840 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2841 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2845 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2846 zlog_debug("%s: malformed %s packet", __func__
,
2847 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2851 /* OSPF Header verification. */
2852 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2853 struct ip
*iph
, struct ospf_header
*ospfh
)
2855 /* Check Area ID. */
2856 if (!ospf_check_area_id(oi
, ospfh
)) {
2857 zlog_warn("interface %s: ospf_read invalid Area ID %s.",
2858 IF_NAME(oi
), inet_ntoa(ospfh
->area_id
));
2862 /* Check network mask, Silently discarded. */
2863 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2865 "interface %s: ospf_read network address is not same [%s]",
2866 IF_NAME(oi
), inet_ntoa(iph
->ip_src
));
2870 /* Check authentication. The function handles logging actions, where
2872 if (!ospf_check_auth(oi
, ospfh
))
2878 /* Starting point of packet process function. */
2879 int ospf_read(struct thread
*thread
)
2882 struct stream
*ibuf
;
2884 struct ospf_interface
*oi
;
2886 struct ospf_header
*ospfh
;
2888 struct interface
*ifp
= NULL
;
2889 struct connected
*c
;
2891 /* first of all get interface pointer. */
2892 ospf
= THREAD_ARG(thread
);
2894 /* prepare for next packet. */
2895 ospf
->t_read
= NULL
;
2896 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
2898 stream_reset(ospf
->ibuf
);
2899 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2902 /* This raw packet is known to be at least as big as its IP header. */
2904 /* Note that there should not be alignment problems with this assignment
2905 because this is at the beginning of the stream data buffer. */
2906 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2907 /* Note that sockopt_iphdrincl_swab_systoh was called in
2908 * ospf_recv_packet. */
2911 /* Handle cases where the platform does not support retrieving
2913 and also platforms (such as Solaris 8) that claim to support
2915 retrieval but do not. */
2916 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2924 /* IP Header dump. */
2925 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2926 ospf_ip_header_dump(iph
);
2928 /* Self-originated packet should be discarded silently. */
2929 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
2930 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
2932 "ospf_read[%s]: Dropping self-originated packet",
2933 inet_ntoa(iph
->ip_src
));
2938 /* Advance from IP header to OSPF header (iph->ip_hl has been verified
2939 by ospf_recv_packet() to be correct). */
2940 stream_forward_getp(ibuf
, iph
->ip_hl
* 4);
2942 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
2944 != ospf_packet_examin(
2945 ospfh
, stream_get_endp(ibuf
) - stream_get_getp(ibuf
)))
2947 /* Now it is safe to access all fields of OSPF packet header. */
2949 /* associate packet with ospf interface */
2950 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
2952 /* ospf_verify_header() relies on a valid "oi" and thus can be called
2954 after the passive/backbone/other checks below are passed. These
2956 in turn access the fields of unverified "ospfh" structure for their
2958 purposes and must remain very accurate in doing this. */
2960 /* If incoming interface is passive one, ignore it. */
2961 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
2962 char buf
[3][INET_ADDRSTRLEN
];
2964 if (IS_DEBUG_OSPF_EVENT
)
2966 "ignoring packet from router %s sent to %s, "
2967 "received on a passive interface, %s",
2968 inet_ntop(AF_INET
, &ospfh
->router_id
, buf
[0],
2970 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
2972 inet_ntop(AF_INET
, &oi
->address
->u
.prefix4
,
2973 buf
[2], sizeof(buf
[2])));
2975 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
2976 /* Try to fix multicast membership.
2977 * Some OS:es may have problems in this area,
2978 * make sure it is removed.
2980 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
2981 ospf_if_set_multicast(oi
);
2987 /* if no local ospf_interface,
2988 * or header area is backbone but ospf_interface is not
2989 * check for VLINK interface
2991 if ((oi
== NULL
) || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
2992 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
2993 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
2995 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
2997 "Packet from [%s] received on link %s"
2998 " but no ospf_interface",
2999 inet_ntoa(iph
->ip_src
), ifp
->name
);
3004 /* else it must be a local ospf interface, check it was received on
3007 else if (oi
->ifp
!= ifp
) {
3008 if (IS_DEBUG_OSPF_EVENT
)
3009 zlog_warn("Packet from [%s] received on wrong link %s",
3010 inet_ntoa(iph
->ip_src
), ifp
->name
);
3012 } else if (oi
->state
== ISM_Down
) {
3013 char buf
[2][INET_ADDRSTRLEN
];
3015 "Ignoring packet from %s to %s received on interface that is "
3016 "down [%s]; interface flags are %s",
3017 inet_ntop(AF_INET
, &iph
->ip_src
, buf
[0],
3019 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3021 ifp
->name
, if_flag_dump(ifp
->flags
));
3022 /* Fix multicast memberships? */
3023 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3024 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3025 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3026 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3027 if (oi
->multicast_memberships
)
3028 ospf_if_set_multicast(oi
);
3033 * If the received packet is destined for AllDRouters, the packet
3034 * should be accepted only if the received ospf interface state is
3035 * either DR or Backup -- endo.
3037 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3038 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3040 "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)",
3041 inet_ntoa(iph
->ip_src
), IF_NAME(oi
),
3042 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3043 /* Try to fix multicast membership. */
3044 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3045 ospf_if_set_multicast(oi
);
3049 /* Verify more OSPF header fields. */
3050 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3052 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3054 "ospf_read[%s]: Header check failed, "
3056 inet_ntoa(iph
->ip_src
));
3060 /* Show debug receiving packet. */
3061 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3062 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3064 "-----------------------------------------------------");
3065 ospf_packet_dump(ibuf
);
3068 zlog_debug("%s received from [%s] via [%s]",
3069 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3070 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
3071 zlog_debug(" src [%s],", inet_ntoa(iph
->ip_src
));
3072 zlog_debug(" dst [%s]", inet_ntoa(iph
->ip_dst
));
3074 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3076 "-----------------------------------------------------");
3079 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3081 /* Adjust size to message length. */
3082 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3084 /* Read rest of the packet and call each sort of packet routine. */
3085 switch (ospfh
->type
) {
3086 case OSPF_MSG_HELLO
:
3087 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3089 case OSPF_MSG_DB_DESC
:
3090 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3092 case OSPF_MSG_LS_REQ
:
3093 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3095 case OSPF_MSG_LS_UPD
:
3096 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3098 case OSPF_MSG_LS_ACK
:
3099 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3102 zlog_warn("interface %s: OSPF packet header type %d is illegal",
3103 IF_NAME(oi
), ospfh
->type
);
3110 /* Make OSPF header. */
3111 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3114 struct ospf_header
*ospfh
;
3116 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3118 ospfh
->version
= (uint8_t)OSPF_VERSION
;
3119 ospfh
->type
= (uint8_t)type
;
3121 ospfh
->router_id
= oi
->ospf
->router_id
;
3123 ospfh
->checksum
= 0;
3124 ospfh
->area_id
= oi
->area
->area_id
;
3125 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3127 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3129 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3132 /* Make Authentication Data. */
3133 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3135 struct crypt_key
*ck
;
3137 switch (ospf_auth_type(oi
)) {
3138 case OSPF_AUTH_NULL
:
3139 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3142 case OSPF_AUTH_SIMPLE
:
3143 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3144 OSPF_AUTH_SIMPLE_SIZE
);
3146 case OSPF_AUTH_CRYPTOGRAPHIC
:
3147 /* If key is not set, then set 0. */
3148 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3149 ospfh
->u
.crypt
.zero
= 0;
3150 ospfh
->u
.crypt
.key_id
= 0;
3151 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3154 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3155 ospfh
->u
.crypt
.zero
= 0;
3156 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3157 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3159 /* note: the seq is done in ospf_make_md5_digest() */
3162 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3170 /* Fill rest of OSPF header. */
3171 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3174 struct ospf_header
*ospfh
;
3176 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3179 ospfh
->length
= htons(length
);
3181 /* Calculate checksum. */
3182 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3183 ospfh
->checksum
= in_cksum(ospfh
, length
);
3185 ospfh
->checksum
= 0;
3187 /* Add Authentication Data. */
3188 ospf_make_auth(oi
, ospfh
);
3191 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3193 struct ospf_neighbor
*nbr
;
3194 struct route_node
*rn
;
3195 uint16_t length
= OSPF_HELLO_MIN_SIZE
;
3196 struct in_addr mask
;
3200 /* Set netmask of interface. */
3201 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3202 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3203 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3204 masklen2ip(oi
->address
->prefixlen
, &mask
);
3206 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3207 stream_put_ipv4(s
, mask
.s_addr
);
3209 /* Set Hello Interval. */
3210 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3211 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3213 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3215 if (IS_DEBUG_OSPF_EVENT
)
3216 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3220 stream_putc(s
, OPTIONS(oi
));
3222 /* Set Router Priority. */
3223 stream_putc(s
, PRIORITY(oi
));
3225 /* Set Router Dead Interval. */
3226 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3228 /* Set Designated Router. */
3229 stream_put_ipv4(s
, DR(oi
).s_addr
);
3231 p
= stream_get_endp(s
);
3233 /* Set Backup Designated Router. */
3234 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3236 /* Add neighbor seen. */
3237 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3238 if ((nbr
= rn
->info
))
3239 if (nbr
->router_id
.s_addr
3240 != 0) /* Ignore 0.0.0.0 node. */
3242 != NSM_Attempt
) /* Ignore Down neighbor. */
3244 != NSM_Down
) /* This is myself for
3246 if (!IPV4_ADDR_SAME(
3248 &oi
->ospf
->router_id
)) {
3249 /* Check neighbor is
3251 if (nbr
->d_router
.s_addr
3272 /* Let neighbor generate BackupSeen. */
3274 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3279 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3280 struct ospf_neighbor
*nbr
, struct stream
*s
)
3282 struct ospf_lsa
*lsa
;
3283 uint16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3287 struct ospf_lsdb
*lsdb
;
3289 /* Set Interface MTU. */
3290 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3293 stream_putw(s
, oi
->ifp
->mtu
);
3296 options
= OPTIONS(oi
);
3297 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3298 SET_FLAG(options
, OSPF_OPTION_O
);
3299 stream_putc(s
, options
);
3302 pp
= stream_get_endp(s
);
3303 stream_putc(s
, nbr
->dd_flags
);
3305 /* Set DD Sequence Number. */
3306 stream_putl(s
, nbr
->dd_seqnum
);
3308 /* shortcut unneeded walk of (empty) summary LSDBs */
3309 if (ospf_db_summary_isempty(nbr
))
3312 /* Describe LSA Header from Database Summary List. */
3313 lsdb
= &nbr
->db_sum
;
3315 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3316 struct route_table
*table
= lsdb
->type
[i
].db
;
3317 struct route_node
*rn
;
3319 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3320 if ((lsa
= rn
->info
) != NULL
) {
3321 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3322 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3323 /* Suppress advertising
3324 * opaque-informations. */
3325 /* Remove LSA from DB summary list. */
3326 ospf_lsdb_delete(lsdb
, lsa
);
3330 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3331 struct lsa_header
*lsah
;
3334 /* DD packet overflows interface MTU. */
3335 if (length
+ OSPF_LSA_HEADER_SIZE
3336 > ospf_packet_max(oi
))
3339 /* Keep pointer to LS age. */
3340 lsah
= (struct lsa_header
3345 /* Proceed stream pointer. */
3346 stream_put(s
, lsa
->data
,
3347 OSPF_LSA_HEADER_SIZE
);
3348 length
+= OSPF_LSA_HEADER_SIZE
;
3351 ls_age
= LS_AGE(lsa
);
3352 lsah
->ls_age
= htons(ls_age
);
3355 /* Remove LSA from DB summary list. */
3356 ospf_lsdb_delete(lsdb
, lsa
);
3360 /* Update 'More' bit */
3361 if (ospf_db_summary_isempty(nbr
)) {
3363 if (nbr
->state
>= NSM_Exchange
) {
3364 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3365 /* Rewrite DD flags */
3366 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3368 assert(IS_SET_DD_M(nbr
->dd_flags
));
3374 static int ospf_make_ls_req_func(struct stream
*s
, uint16_t *length
,
3375 unsigned long delta
, struct ospf_neighbor
*nbr
,
3376 struct ospf_lsa
*lsa
)
3378 struct ospf_interface
*oi
;
3382 /* LS Request packet overflows interface MTU. */
3383 if (*length
+ delta
> ospf_packet_max(oi
))
3386 stream_putl(s
, lsa
->data
->type
);
3387 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3388 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3390 ospf_lsa_unlock(&nbr
->ls_req_last
);
3391 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3397 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3399 struct ospf_lsa
*lsa
;
3400 uint16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3401 unsigned long delta
= stream_get_endp(s
) + 12;
3402 struct route_table
*table
;
3403 struct route_node
*rn
;
3405 struct ospf_lsdb
*lsdb
;
3407 lsdb
= &nbr
->ls_req
;
3409 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3410 table
= lsdb
->type
[i
].db
;
3411 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3412 if ((lsa
= (rn
->info
)) != NULL
)
3413 if (ospf_make_ls_req_func(s
, &length
, delta
,
3416 route_unlock_node(rn
);
3423 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3427 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3429 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3432 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3435 struct ospf_lsa
*lsa
;
3436 struct listnode
*node
;
3437 uint16_t length
= 0;
3438 unsigned int size_noauth
;
3439 unsigned long delta
= stream_get_endp(s
);
3443 if (IS_DEBUG_OSPF_EVENT
)
3444 zlog_debug("ospf_make_ls_upd: Start");
3446 pp
= stream_get_endp(s
);
3447 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3448 length
+= OSPF_LS_UPD_MIN_SIZE
;
3450 /* Calculate amount of packet usable for data. */
3451 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3453 while ((node
= listhead(update
)) != NULL
) {
3454 struct lsa_header
*lsah
;
3457 if (IS_DEBUG_OSPF_EVENT
)
3458 zlog_debug("ospf_make_ls_upd: List Iteration %d",
3461 lsa
= listgetdata(node
);
3466 if (length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
)
3469 /* Keep pointer to LS age. */
3470 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3471 + stream_get_endp(s
));
3473 /* Put LSA to Link State Request. */
3474 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3477 /* each hop must increment an lsa_age by transmit_delay
3478 of OSPF interface */
3479 ls_age
= ls_age_increment(lsa
,
3480 OSPF_IF_PARAM(oi
, transmit_delay
));
3481 lsah
->ls_age
= htons(ls_age
);
3483 length
+= ntohs(lsa
->data
->length
);
3486 list_delete_node(update
, node
);
3487 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3490 /* Now set #LSAs. */
3491 stream_putl_at(s
, pp
, count
);
3493 if (IS_DEBUG_OSPF_EVENT
)
3494 zlog_debug("ospf_make_ls_upd: Stop");
3498 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3501 struct listnode
*node
, *nnode
;
3502 uint16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3503 unsigned long delta
= stream_get_endp(s
) + 24;
3504 struct ospf_lsa
*lsa
;
3506 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3509 if (length
+ delta
> ospf_packet_max(oi
))
3512 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3513 length
+= OSPF_LSA_HEADER_SIZE
;
3515 listnode_delete(ack
, lsa
);
3516 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3522 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3524 struct ospf_packet
*op
;
3525 uint16_t length
= OSPF_HEADER_SIZE
;
3527 op
= ospf_packet_new(oi
->ifp
->mtu
);
3529 /* Prepare OSPF common header. */
3530 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3532 /* Prepare OSPF Hello body. */
3533 length
+= ospf_make_hello(oi
, op
->s
);
3535 /* Fill OSPF header. */
3536 ospf_fill_header(oi
, op
->s
, length
);
3538 /* Set packet length. */
3539 op
->length
= length
;
3541 op
->dst
.s_addr
= addr
;
3543 if (IS_DEBUG_OSPF_EVENT
) {
3544 if (oi
->ospf
->vrf_id
)
3546 "%s: Hello Tx interface %s ospf vrf %s id %u",
3547 __PRETTY_FUNCTION__
, oi
->ifp
->name
,
3548 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
),
3551 /* Add packet to the top of the interface output queue, so that they
3552 * can't get delayed by things like long queues of LS Update packets
3554 ospf_packet_add_top(oi
, op
);
3556 /* Hook thread to write packet. */
3557 OSPF_ISM_WRITE_ON(oi
->ospf
);
3560 static void ospf_poll_send(struct ospf_nbr_nbma
*nbr_nbma
)
3562 struct ospf_interface
*oi
;
3567 /* If this is passive interface, do not send OSPF Hello. */
3568 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3571 if (oi
->type
!= OSPF_IFTYPE_NBMA
)
3574 if (nbr_nbma
->nbr
!= NULL
&& nbr_nbma
->nbr
->state
!= NSM_Down
)
3577 if (PRIORITY(oi
) == 0)
3580 if (nbr_nbma
->priority
== 0 && oi
->state
!= ISM_DR
3581 && oi
->state
!= ISM_Backup
)
3584 ospf_hello_send_sub(oi
, nbr_nbma
->addr
.s_addr
);
3587 int ospf_poll_timer(struct thread
*thread
)
3589 struct ospf_nbr_nbma
*nbr_nbma
;
3591 nbr_nbma
= THREAD_ARG(thread
);
3592 nbr_nbma
->t_poll
= NULL
;
3594 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3595 zlog_debug("NSM[%s:%s]: Timer (Poll timer expire)",
3596 IF_NAME(nbr_nbma
->oi
), inet_ntoa(nbr_nbma
->addr
));
3598 ospf_poll_send(nbr_nbma
);
3600 if (nbr_nbma
->v_poll
> 0)
3601 OSPF_POLL_TIMER_ON(nbr_nbma
->t_poll
, ospf_poll_timer
,
3608 int ospf_hello_reply_timer(struct thread
*thread
)
3610 struct ospf_neighbor
*nbr
;
3612 nbr
= THREAD_ARG(thread
);
3613 nbr
->t_hello_reply
= NULL
;
3617 if (IS_DEBUG_OSPF(nsm
, NSM_TIMERS
))
3618 zlog_debug("NSM[%s:%s]: Timer (hello-reply timer expire)",
3619 IF_NAME(nbr
->oi
), inet_ntoa(nbr
->router_id
));
3621 ospf_hello_send_sub(nbr
->oi
, nbr
->address
.u
.prefix4
.s_addr
);
3626 /* Send OSPF Hello. */
3627 void ospf_hello_send(struct ospf_interface
*oi
)
3629 /* If this is passive interface, do not send OSPF Hello. */
3630 if (OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
)
3633 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
3634 struct ospf_neighbor
*nbr
;
3635 struct route_node
*rn
;
3637 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3638 if ((nbr
= rn
->info
))
3639 if (nbr
!= oi
->nbr_self
)
3640 if (nbr
->state
!= NSM_Down
) {
3641 /* RFC 2328 Section 9.5.1
3642 If the router is not
3643 eligible to become Designated
3645 it must periodically send
3646 Hello Packets to both the
3647 Designated Router and the
3648 Backup Designated Router (if
3651 if (PRIORITY(oi
) == 0
3662 /* If the router is eligible to
3663 become Designated Router, it
3664 must periodically send Hello
3665 Packets to all neighbors that
3666 are also eligible. In
3667 addition, if the router is
3669 Designated Router or Backup
3670 Designated Router, it must
3672 send periodic Hello Packets
3673 to all other neighbors. */
3675 if (nbr
->priority
== 0
3676 && oi
->state
== ISM_DROther
)
3678 /* if oi->state == Waiting, send
3679 * hello to all neighbors */
3680 ospf_hello_send_sub(
3682 nbr
->address
.u
.prefix4
3686 /* Decide destination address. */
3687 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3688 ospf_hello_send_sub(oi
, oi
->vl_data
->peer_addr
.s_addr
);
3690 ospf_hello_send_sub(oi
, htonl(OSPF_ALLSPFROUTERS
));
3694 /* Send OSPF Database Description. */
3695 void ospf_db_desc_send(struct ospf_neighbor
*nbr
)
3697 struct ospf_interface
*oi
;
3698 struct ospf_packet
*op
;
3699 uint16_t length
= OSPF_HEADER_SIZE
;
3702 op
= ospf_packet_new(oi
->ifp
->mtu
);
3704 /* Prepare OSPF common header. */
3705 ospf_make_header(OSPF_MSG_DB_DESC
, oi
, op
->s
);
3707 /* Prepare OSPF Database Description body. */
3708 length
+= ospf_make_db_desc(oi
, nbr
, op
->s
);
3710 /* Fill OSPF header. */
3711 ospf_fill_header(oi
, op
->s
, length
);
3713 /* Set packet length. */
3714 op
->length
= length
;
3716 /* Decide destination address. */
3717 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3718 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3720 op
->dst
= nbr
->address
.u
.prefix4
;
3722 /* Add packet to the interface output queue. */
3723 ospf_packet_add(oi
, op
);
3725 /* Hook thread to write packet. */
3726 OSPF_ISM_WRITE_ON(oi
->ospf
);
3728 /* Remove old DD packet, then copy new one and keep in neighbor
3731 ospf_packet_free(nbr
->last_send
);
3732 nbr
->last_send
= ospf_packet_dup(op
);
3733 monotime(&nbr
->last_send_ts
);
3736 /* Re-send Database Description. */
3737 void ospf_db_desc_resend(struct ospf_neighbor
*nbr
)
3739 struct ospf_interface
*oi
;
3743 /* Add packet to the interface output queue. */
3744 ospf_packet_add(oi
, ospf_packet_dup(nbr
->last_send
));
3746 /* Hook thread to write packet. */
3747 OSPF_ISM_WRITE_ON(oi
->ospf
);
3750 /* Send Link State Request. */
3751 void ospf_ls_req_send(struct ospf_neighbor
*nbr
)
3753 struct ospf_interface
*oi
;
3754 struct ospf_packet
*op
;
3755 uint16_t length
= OSPF_HEADER_SIZE
;
3758 op
= ospf_packet_new(oi
->ifp
->mtu
);
3760 /* Prepare OSPF common header. */
3761 ospf_make_header(OSPF_MSG_LS_REQ
, oi
, op
->s
);
3763 /* Prepare OSPF Link State Request body. */
3764 length
+= ospf_make_ls_req(nbr
, op
->s
);
3765 if (length
== OSPF_HEADER_SIZE
) {
3766 ospf_packet_free(op
);
3770 /* Fill OSPF header. */
3771 ospf_fill_header(oi
, op
->s
, length
);
3773 /* Set packet length. */
3774 op
->length
= length
;
3776 /* Decide destination address. */
3777 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3778 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3780 op
->dst
= nbr
->address
.u
.prefix4
;
3782 /* Add packet to the interface output queue. */
3783 ospf_packet_add(oi
, op
);
3785 /* Hook thread to write packet. */
3786 OSPF_ISM_WRITE_ON(oi
->ospf
);
3788 /* Add Link State Request Retransmission Timer. */
3789 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
3792 /* Send Link State Update with an LSA. */
3793 void ospf_ls_upd_send_lsa(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
,
3796 struct list
*update
;
3798 update
= list_new();
3800 listnode_add(update
, lsa
);
3802 /*ospf instance is going down, send self originated
3803 * MAXAGE LSA update to neighbors to remove from LSDB */
3804 if (nbr
->oi
->ospf
->inst_shutdown
&& IS_LSA_MAXAGE(lsa
))
3805 ospf_ls_upd_send(nbr
, update
, flag
, 1);
3807 ospf_ls_upd_send(nbr
, update
, flag
, 0);
3809 list_delete_and_null(&update
);
3812 /* Determine size for packet. Must be at least big enough to accomodate next
3813 * LSA on list, which may be bigger than MTU size.
3815 * Return pointer to new ospf_packet
3816 * NULL if we can not allocate, eg because LSA is bigger than imposed limit
3817 * on packet sizes (in which case offending LSA is deleted from update list)
3819 static struct ospf_packet
*ospf_ls_upd_packet_new(struct list
*update
,
3820 struct ospf_interface
*oi
)
3822 struct ospf_lsa
*lsa
;
3823 struct listnode
*ln
;
3825 static char warned
= 0;
3827 lsa
= listgetdata((ln
= listhead(update
)));
3830 if ((OSPF_LS_UPD_MIN_SIZE
+ ntohs(lsa
->data
->length
))
3831 > ospf_packet_max(oi
)) {
3834 "ospf_ls_upd_packet_new: oversized LSA encountered!"
3835 "will need to fragment. Not optimal. Try divide up"
3836 " your network with areas. Use 'debug ospf packet send'"
3837 " to see details, or look at 'show ip ospf database ..'");
3841 if (IS_DEBUG_OSPF_PACKET(0, SEND
))
3843 "ospf_ls_upd_packet_new: oversized LSA id:%s,"
3844 " %d bytes originated by %s, will be fragmented!",
3845 inet_ntoa(lsa
->data
->id
),
3846 ntohs(lsa
->data
->length
),
3847 inet_ntoa(lsa
->data
->adv_router
));
3850 * Allocate just enough to fit this LSA only, to avoid including
3852 * LSAs in fragmented LSA Updates.
3854 size
= ntohs(lsa
->data
->length
)
3855 + (oi
->ifp
->mtu
- ospf_packet_max(oi
))
3856 + OSPF_LS_UPD_MIN_SIZE
;
3858 size
= oi
->ifp
->mtu
;
3860 if (size
> OSPF_MAX_PACKET_SIZE
) {
3862 "ospf_ls_upd_packet_new: oversized LSA id:%s too big,"
3863 " %d bytes, packet size %ld, dropping it completely."
3864 " OSPF routing is broken!",
3865 inet_ntoa(lsa
->data
->id
), ntohs(lsa
->data
->length
),
3867 list_delete_node(update
, ln
);
3871 /* IP header is built up separately by ospf_write(). This means, that we
3873 * reduce the "affordable" size just calculated by length of an IP
3875 * This makes sure, that even if we manage to fill the payload with LSA
3877 * completely, the final packet (our data plus IP header) still fits
3879 * outgoing interface MTU. This correction isn't really meaningful for
3881 * oversized LSA, but for consistency the correction is done for both
3884 * P.S. OSPF_MAX_PACKET_SIZE above already includes IP header size
3886 return ospf_packet_new(size
- sizeof(struct ip
));
3889 static void ospf_ls_upd_queue_send(struct ospf_interface
*oi
,
3890 struct list
*update
, struct in_addr addr
,
3893 struct ospf_packet
*op
;
3894 uint16_t length
= OSPF_HEADER_SIZE
;
3896 if (IS_DEBUG_OSPF_EVENT
)
3897 zlog_debug("listcount = %d, [%s]dst %s", listcount(update
),
3898 IF_NAME(oi
), inet_ntoa(addr
));
3900 /* Check that we have really something to process */
3901 if (listcount(update
) == 0)
3904 op
= ospf_ls_upd_packet_new(update
, oi
);
3906 /* Prepare OSPF common header. */
3907 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
3909 /* Prepare OSPF Link State Update body.
3910 * Includes Type-7 translation.
3912 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
3914 /* Fill OSPF header. */
3915 ospf_fill_header(oi
, op
->s
, length
);
3917 /* Set packet length. */
3918 op
->length
= length
;
3920 /* Decide destination address. */
3921 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3922 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3924 op
->dst
.s_addr
= addr
.s_addr
;
3926 /* Add packet to the interface output queue. */
3927 ospf_packet_add(oi
, op
);
3928 /* Call ospf_write() right away to send ospf packets to neighbors */
3929 if (send_lsupd_now
) {
3930 struct thread os_packet_thd
;
3932 os_packet_thd
.arg
= (void *)oi
->ospf
;
3933 if (oi
->on_write_q
== 0) {
3934 listnode_add(oi
->ospf
->oi_write_q
, oi
);
3937 ospf_write(&os_packet_thd
);
3939 /* Hook thread to write packet. */
3940 OSPF_ISM_WRITE_ON(oi
->ospf
);
3944 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
3946 struct ospf_interface
*oi
= THREAD_ARG(thread
);
3947 struct route_node
*rn
;
3948 struct route_node
*rnext
;
3949 struct list
*update
;
3952 oi
->t_ls_upd_event
= NULL
;
3954 if (IS_DEBUG_OSPF_EVENT
)
3955 zlog_debug("ospf_ls_upd_send_queue start");
3957 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
3958 rnext
= route_next(rn
);
3960 if (rn
->info
== NULL
)
3963 update
= (struct list
*)rn
->info
;
3965 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
3967 /* list might not be empty. */
3968 if (listcount(update
) == 0) {
3969 list_delete_and_null((struct list
**)&rn
->info
);
3970 route_unlock_node(rn
);
3976 if (IS_DEBUG_OSPF_EVENT
)
3978 "ospf_ls_upd_send_queue: update lists not cleared,"
3979 " %d nodes to try again, raising new event",
3981 oi
->t_ls_upd_event
= NULL
;
3982 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
3983 &oi
->t_ls_upd_event
);
3986 if (IS_DEBUG_OSPF_EVENT
)
3987 zlog_debug("ospf_ls_upd_send_queue stop");
3992 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
3995 struct ospf_interface
*oi
;
3996 struct ospf_lsa
*lsa
;
3997 struct prefix_ipv4 p
;
3998 struct route_node
*rn
;
3999 struct listnode
*node
;
4004 p
.prefixlen
= IPV4_MAX_BITLEN
;
4006 /* Decide destination address. */
4007 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4008 p
.prefix
= oi
->vl_data
->peer_addr
;
4009 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4010 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4011 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4012 p
.prefix
= nbr
->address
.u
.prefix4
;
4013 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4014 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4015 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4016 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4018 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4020 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4021 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4023 "* LS-Update is directly sent on NBMA network.");
4024 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4025 zlog_warn("* LS-Update is sent to myself.");
4028 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4030 if (rn
->info
== NULL
)
4031 rn
->info
= list_new();
4033 route_unlock_node(rn
);
4035 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4036 listnode_add(rn
->info
,
4037 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4038 if (send_lsupd_now
) {
4039 struct list
*send_update_list
;
4040 struct route_node
*rn
, *rnext
;
4042 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4043 rnext
= route_next(rn
);
4045 if (rn
->info
== NULL
)
4048 send_update_list
= (struct list
*)rn
->info
;
4050 ospf_ls_upd_queue_send(oi
, send_update_list
,
4051 rn
->p
.u
.prefix4
, 1);
4054 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4055 &oi
->t_ls_upd_event
);
4058 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4061 struct ospf_packet
*op
;
4062 uint16_t length
= OSPF_HEADER_SIZE
;
4064 op
= ospf_packet_new(oi
->ifp
->mtu
);
4066 /* Prepare OSPF common header. */
4067 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4069 /* Prepare OSPF Link State Acknowledgment body. */
4070 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4072 /* Fill OSPF header. */
4073 ospf_fill_header(oi
, op
->s
, length
);
4075 /* Set packet length. */
4076 op
->length
= length
;
4078 /* Decide destination address. */
4079 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4080 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4082 op
->dst
.s_addr
= dst
.s_addr
;
4084 /* Add packet to the interface output queue. */
4085 ospf_packet_add(oi
, op
);
4087 /* Hook thread to write packet. */
4088 OSPF_ISM_WRITE_ON(oi
->ospf
);
4091 static int ospf_ls_ack_send_event(struct thread
*thread
)
4093 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4095 oi
->t_ls_ack_direct
= NULL
;
4097 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4098 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4099 oi
->ls_ack_direct
.dst
);
4104 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4106 struct ospf_interface
*oi
= nbr
->oi
;
4108 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4109 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4111 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4113 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4114 &oi
->t_ls_ack_direct
);
4117 /* Send Link State Acknowledgment delayed. */
4118 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4122 /* Decide destination address. */
4123 /* RFC2328 Section 13.5 On non-broadcast
4124 networks, delayed Link State Acknowledgment packets must be
4125 unicast separately over each adjacency (i.e., neighbor whose
4126 state is >= Exchange). */
4127 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4128 struct ospf_neighbor
*nbr
;
4129 struct route_node
*rn
;
4131 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4132 if ((nbr
= rn
->info
) != NULL
)
4133 if (nbr
!= oi
->nbr_self
4134 && nbr
->state
>= NSM_Exchange
)
4135 while (listcount(oi
->ls_ack
))
4136 ospf_ls_ack_send_list(
4138 nbr
->address
.u
.prefix4
);
4141 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4142 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4143 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4144 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4145 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4146 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4147 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4148 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4150 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4152 while (listcount(oi
->ls_ack
))
4153 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4157 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4158 * address. As a result, the kernel does not need to learn the interface
4159 * MAC of the OSPF neighbor. However, in our world, this will delay
4160 * convergence. Take the case when due to a link flap, all routes now
4161 * want to use an interface which was deemed to be costlier prior to this
4162 * event. For routes that will be installed, the missing MAC will have
4163 * punt-to-CPU set on them. This may overload the CPU control path that
4164 * can be avoided if the MAC was known apriori.
4166 #define OSPF_PING_NBR_STR_MAX (BUFSIZ)
4167 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4169 char ping_nbr
[OSPF_PING_NBR_STR_MAX
];
4172 if (!nbr
|| !nbr
->oi
|| !nbr
->oi
->ifp
)
4175 snprintf(ping_nbr
, sizeof(ping_nbr
),
4176 "ping -c 1 -I %s %s > /dev/null 2>&1 &", nbr
->oi
->ifp
->name
,
4177 inet_ntoa(nbr
->address
.u
.prefix4
));
4179 ret
= system(ping_nbr
);
4180 if (IS_DEBUG_OSPF_EVENT
)
4181 zlog_debug("Executed %s %s", ping_nbr
,
4182 ((ret
== 0) ? "successfully" : "but failed"));