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"
39 #include "ospfd/ospfd.h"
40 #include "ospfd/ospf_network.h"
41 #include "ospfd/ospf_interface.h"
42 #include "ospfd/ospf_ism.h"
43 #include "ospfd/ospf_asbr.h"
44 #include "ospfd/ospf_lsa.h"
45 #include "ospfd/ospf_lsdb.h"
46 #include "ospfd/ospf_neighbor.h"
47 #include "ospfd/ospf_nsm.h"
48 #include "ospfd/ospf_packet.h"
49 #include "ospfd/ospf_spf.h"
50 #include "ospfd/ospf_flood.h"
51 #include "ospfd/ospf_dump.h"
54 * OSPF Fragmentation / fragmented writes
56 * ospfd can support writing fragmented packets, for cases where
57 * kernel will not fragment IP_HDRINCL and/or multicast destined
58 * packets (ie TTBOMK all kernels, BSD, SunOS, Linux). However,
59 * SunOS, probably BSD too, clobber the user supplied IP ID and IP
60 * flags fields, hence user-space fragmentation will not work.
61 * Only Linux is known to leave IP header unmolested.
62 * Further, fragmentation really should be done the kernel, which already
63 * supports it, and which avoids nasty IP ID state problems.
65 * Fragmentation of OSPF packets can be required on networks with router
66 * with many many interfaces active in one area, or on networks with links
70 #define WANT_OSPF_WRITE_FRAGMENT
73 /* Packet Type String. */
74 const struct message ospf_packet_type_str
[] = {
75 {OSPF_MSG_HELLO
, "Hello"},
76 {OSPF_MSG_DB_DESC
, "Database Description"},
77 {OSPF_MSG_LS_REQ
, "Link State Request"},
78 {OSPF_MSG_LS_UPD
, "Link State Update"},
79 {OSPF_MSG_LS_ACK
, "Link State Acknowledgment"},
82 /* Minimum (besides OSPF_HEADER_SIZE) lengths for OSPF packets of
83 particular types, offset is the "type" field of a packet. */
84 static const u_int16_t ospf_packet_minlen
[] = {
87 OSPF_DB_DESC_MIN_SIZE
,
93 /* Minimum (besides OSPF_LSA_HEADER_SIZE) lengths for LSAs of particular
94 types, offset is the "LSA type" field. */
95 static const u_int16_t ospf_lsa_minlen
[] = {
97 OSPF_ROUTER_LSA_MIN_SIZE
,
98 OSPF_NETWORK_LSA_MIN_SIZE
,
99 OSPF_SUMMARY_LSA_MIN_SIZE
,
100 OSPF_SUMMARY_LSA_MIN_SIZE
,
101 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
103 OSPF_AS_EXTERNAL_LSA_MIN_SIZE
,
110 /* for ospf_check_auth() */
111 static int ospf_check_sum(struct ospf_header
*);
113 /* OSPF authentication checking function */
114 static int ospf_auth_type(struct ospf_interface
*oi
)
118 if (OSPF_IF_PARAM(oi
, auth_type
) == OSPF_AUTH_NOTSET
)
119 auth_type
= oi
->area
->auth_type
;
121 auth_type
= OSPF_IF_PARAM(oi
, auth_type
);
123 /* Handle case where MD5 key list is not configured aka Cisco */
124 if (auth_type
== OSPF_AUTH_CRYPTOGRAPHIC
125 && list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
126 return OSPF_AUTH_NULL
;
131 struct ospf_packet
*ospf_packet_new(size_t size
)
133 struct ospf_packet
*new;
135 new = XCALLOC(MTYPE_OSPF_PACKET
, sizeof(struct ospf_packet
));
136 new->s
= stream_new(size
);
141 void ospf_packet_free(struct ospf_packet
*op
)
146 XFREE(MTYPE_OSPF_PACKET
, op
);
151 struct ospf_fifo
*ospf_fifo_new()
153 struct ospf_fifo
*new;
155 new = XCALLOC(MTYPE_OSPF_FIFO
, sizeof(struct ospf_fifo
));
159 /* Add new packet to fifo. */
160 void ospf_fifo_push(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
163 fifo
->tail
->next
= op
;
172 /* Add new packet to head of fifo. */
173 static void ospf_fifo_push_head(struct ospf_fifo
*fifo
, struct ospf_packet
*op
)
175 op
->next
= fifo
->head
;
177 if (fifo
->tail
== NULL
)
185 /* Delete first packet from fifo. */
186 struct ospf_packet
*ospf_fifo_pop(struct ospf_fifo
*fifo
)
188 struct ospf_packet
*op
;
193 fifo
->head
= op
->next
;
195 if (fifo
->head
== NULL
)
204 /* Return first fifo entry. */
205 struct ospf_packet
*ospf_fifo_head(struct ospf_fifo
*fifo
)
210 /* Flush ospf packet fifo. */
211 void ospf_fifo_flush(struct ospf_fifo
*fifo
)
213 struct ospf_packet
*op
;
214 struct ospf_packet
*next
;
216 for (op
= fifo
->head
; op
; op
= next
) {
218 ospf_packet_free(op
);
220 fifo
->head
= fifo
->tail
= NULL
;
224 /* Free ospf packet fifo. */
225 void ospf_fifo_free(struct ospf_fifo
*fifo
)
227 ospf_fifo_flush(fifo
);
229 XFREE(MTYPE_OSPF_FIFO
, fifo
);
232 void ospf_packet_add(struct ospf_interface
*oi
, struct ospf_packet
*op
)
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_packet_add(interface %s in state %d [%s], packet type %s, "
260 "destination %s) called with NULL obuf, ignoring "
261 "(please report this bug)!\n",
262 IF_NAME(oi
), oi
->state
,
263 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
),
264 lookup_msg(ospf_packet_type_str
,
265 stream_getc_from(op
->s
, 1), NULL
),
270 /* Add packet to head of queue. */
271 ospf_fifo_push_head(oi
->obuf
, op
);
273 /* Debug of packet fifo*/
274 /* ospf_fifo_debug (oi->obuf); */
277 void ospf_packet_delete(struct ospf_interface
*oi
)
279 struct ospf_packet
*op
;
281 op
= ospf_fifo_pop(oi
->obuf
);
284 ospf_packet_free(op
);
287 struct ospf_packet
*ospf_packet_dup(struct ospf_packet
*op
)
289 struct ospf_packet
*new;
291 if (stream_get_endp(op
->s
) != op
->length
)
294 "ospf_packet_dup stream %lu ospf_packet %u size mismatch",
295 (u_long
)STREAM_SIZE(op
->s
), op
->length
);
297 /* Reserve space for MD5 authentication that may be added later. */
298 new = ospf_packet_new(stream_get_endp(op
->s
) + OSPF_AUTH_MD5_SIZE
);
299 stream_copy(new->s
, op
->s
);
302 new->length
= op
->length
;
308 static unsigned int ospf_packet_authspace(struct ospf_interface
*oi
)
312 if (ospf_auth_type(oi
) == OSPF_AUTH_CRYPTOGRAPHIC
)
313 auth
= OSPF_AUTH_MD5_SIZE
;
318 static unsigned int ospf_packet_max(struct ospf_interface
*oi
)
322 max
= oi
->ifp
->mtu
- ospf_packet_authspace(oi
);
324 max
-= (OSPF_HEADER_SIZE
+ sizeof(struct ip
));
330 static int ospf_check_md5_digest(struct ospf_interface
*oi
,
331 struct ospf_header
*ospfh
)
334 unsigned char digest
[OSPF_AUTH_MD5_SIZE
];
335 struct crypt_key
*ck
;
336 struct ospf_neighbor
*nbr
;
337 u_int16_t length
= ntohs(ospfh
->length
);
339 /* Get secret key. */
340 ck
= ospf_crypt_key_lookup(OSPF_IF_PARAM(oi
, auth_crypt
),
341 ospfh
->u
.crypt
.key_id
);
343 zlog_warn("interface %s: ospf_check_md5 no key %d", IF_NAME(oi
),
344 ospfh
->u
.crypt
.key_id
);
348 /* check crypto seqnum. */
349 nbr
= ospf_nbr_lookup_by_routerid(oi
->nbrs
, &ospfh
->router_id
);
352 && ntohl(nbr
->crypt_seqnum
) > ntohl(ospfh
->u
.crypt
.crypt_seqnum
)) {
354 "interface %s: ospf_check_md5 bad sequence %d (expect %d)",
355 IF_NAME(oi
), ntohl(ospfh
->u
.crypt
.crypt_seqnum
),
356 ntohl(nbr
->crypt_seqnum
));
360 /* Generate a digest for the ospf packet - their digest + our digest. */
361 memset(&ctx
, 0, sizeof(ctx
));
363 MD5Update(&ctx
, ospfh
, length
);
364 MD5Update(&ctx
, ck
->auth_key
, OSPF_AUTH_MD5_SIZE
);
365 MD5Final(digest
, &ctx
);
367 /* compare the two */
368 if (memcmp((caddr_t
)ospfh
+ length
, digest
, OSPF_AUTH_MD5_SIZE
)) {
369 zlog_warn("interface %s: ospf_check_md5 checksum mismatch",
374 /* save neighbor's crypt_seqnum */
376 nbr
->crypt_seqnum
= ospfh
->u
.crypt
.crypt_seqnum
;
380 /* This function is called from ospf_write(), it will detect the
381 authentication scheme and if it is MD5, it will change the sequence
382 and update the MD5 digest. */
383 static int ospf_make_md5_digest(struct ospf_interface
*oi
,
384 struct ospf_packet
*op
)
386 struct ospf_header
*ospfh
;
387 unsigned char digest
[OSPF_AUTH_MD5_SIZE
] = {0};
391 struct crypt_key
*ck
;
392 const u_int8_t
*auth_key
;
394 ibuf
= STREAM_DATA(op
->s
);
395 ospfh
= (struct ospf_header
*)ibuf
;
397 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
400 /* We do this here so when we dup a packet, we don't have to
401 waste CPU rewriting other headers.
403 Note that quagga_time /deliberately/ is not used here */
404 t
= (time(NULL
) & 0xFFFFFFFF);
405 if (t
> oi
->crypt_seqnum
)
406 oi
->crypt_seqnum
= t
;
410 ospfh
->u
.crypt
.crypt_seqnum
= htonl(oi
->crypt_seqnum
);
412 /* Get MD5 Authentication key from auth_key list. */
413 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
)))
414 auth_key
= (const u_int8_t
*)digest
;
416 ck
= listgetdata(listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
417 auth_key
= ck
->auth_key
;
420 /* Generate a digest for the entire packet + our secret key. */
421 memset(&ctx
, 0, sizeof(ctx
));
423 MD5Update(&ctx
, ibuf
, ntohs(ospfh
->length
));
424 MD5Update(&ctx
, auth_key
, OSPF_AUTH_MD5_SIZE
);
425 MD5Final(digest
, &ctx
);
427 /* Append md5 digest to the end of the stream. */
428 stream_put(op
->s
, digest
, OSPF_AUTH_MD5_SIZE
);
430 /* We do *NOT* increment the OSPF header length. */
431 op
->length
= ntohs(ospfh
->length
) + OSPF_AUTH_MD5_SIZE
;
433 if (stream_get_endp(op
->s
) != op
->length
)
436 "ospf_make_md5_digest: length mismatch stream %lu ospf_packet %u",
437 (u_long
)stream_get_endp(op
->s
), op
->length
);
439 return OSPF_AUTH_MD5_SIZE
;
443 static int ospf_ls_req_timer(struct thread
*thread
)
445 struct ospf_neighbor
*nbr
;
447 nbr
= THREAD_ARG(thread
);
448 nbr
->t_ls_req
= NULL
;
450 /* Send Link State Request. */
451 if (ospf_ls_request_count(nbr
))
452 ospf_ls_req_send(nbr
);
454 /* Set Link State Request retransmission timer. */
455 OSPF_NSM_TIMER_ON(nbr
->t_ls_req
, ospf_ls_req_timer
, nbr
->v_ls_req
);
460 void ospf_ls_req_event(struct ospf_neighbor
*nbr
)
463 thread_cancel(nbr
->t_ls_req
);
464 nbr
->t_ls_req
= NULL
;
466 nbr
->t_ls_req
= NULL
;
467 thread_add_event(master
, ospf_ls_req_timer
, nbr
, 0, &nbr
->t_ls_req
);
470 /* Cyclic timer function. Fist registered in ospf_nbr_new () in
472 int ospf_ls_upd_timer(struct thread
*thread
)
474 struct ospf_neighbor
*nbr
;
476 nbr
= THREAD_ARG(thread
);
477 nbr
->t_ls_upd
= NULL
;
479 /* Send Link State Update. */
480 if (ospf_ls_retransmit_count(nbr
) > 0) {
482 struct ospf_lsdb
*lsdb
;
484 int retransmit_interval
;
486 retransmit_interval
=
487 OSPF_IF_PARAM(nbr
->oi
, retransmit_interval
);
489 lsdb
= &nbr
->ls_rxmt
;
492 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
493 struct route_table
*table
= lsdb
->type
[i
].db
;
494 struct route_node
*rn
;
496 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
497 struct ospf_lsa
*lsa
;
499 if ((lsa
= rn
->info
) != NULL
) {
500 /* Don't retransmit an LSA if we
502 the last RxmtInterval seconds - this
504 neighbour a chance to acknowledge the
506 have ben just received before the
508 fired. This is a small tweak to what
510 but it will cut out out a lot of
513 if (monotime_since(&lsa
->tv_recv
, NULL
)
514 >= retransmit_interval
* 1000000LL)
515 listnode_add(update
, rn
->info
);
520 if (listcount(update
) > 0)
521 ospf_ls_upd_send(nbr
, update
,
522 OSPF_SEND_PACKET_DIRECT
, 0);
523 list_delete_and_null(&update
);
526 /* Set LS Update retransmission timer. */
527 OSPF_NSM_TIMER_ON(nbr
->t_ls_upd
, ospf_ls_upd_timer
, nbr
->v_ls_upd
);
532 int ospf_ls_ack_timer(struct thread
*thread
)
534 struct ospf_interface
*oi
;
536 oi
= THREAD_ARG(thread
);
539 /* Send Link State Acknowledgment. */
540 if (listcount(oi
->ls_ack
) > 0)
541 ospf_ls_ack_send_delayed(oi
);
543 /* Set LS Ack timer. */
544 OSPF_ISM_TIMER_ON(oi
->t_ls_ack
, ospf_ls_ack_timer
, oi
->v_ls_ack
);
549 #ifdef WANT_OSPF_WRITE_FRAGMENT
550 static void ospf_write_frags(int fd
, struct ospf_packet
*op
, struct ip
*iph
,
551 struct msghdr
*msg
, unsigned int maxdatasize
,
552 unsigned int mtu
, int flags
, u_char type
)
554 #define OSPF_WRITE_FRAG_SHIFT 3
559 assert(op
->length
== stream_get_endp(op
->s
));
560 assert(msg
->msg_iovlen
== 2);
564 * SunOS, BSD and BSD derived kernels likely will clear ip_id, as
565 * well as the IP_MF flag, making this all quite pointless.
567 * However, for a system on which IP_MF is left alone, and ip_id left
568 * alone or else which sets same ip_id for each fragment this might
571 * XXX-TODO: It would be much nicer to have the kernel's use their
572 * existing fragmentation support to do this for us. Bugs/RFEs need to
573 * be raised against the various kernels.
577 iph
->ip_off
|= IP_MF
;
579 /* ip frag offset is expressed in units of 8byte words */
580 offset
= maxdatasize
>> OSPF_WRITE_FRAG_SHIFT
;
582 iovp
= &msg
->msg_iov
[1];
584 while ((stream_get_endp(op
->s
) - stream_get_getp(op
->s
))
586 /* data length of this frag is to next offset value */
587 iovp
->iov_len
= offset
<< OSPF_WRITE_FRAG_SHIFT
;
588 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
589 assert(iph
->ip_len
<= mtu
);
591 sockopt_iphdrincl_swab_htosys(iph
);
593 ret
= sendmsg(fd
, msg
, flags
);
595 sockopt_iphdrincl_swab_systoh(iph
);
599 "*** ospf_write_frags: sendmsg failed to %s,"
600 " id %d, off %d, len %d, mtu %u failed with %s",
601 inet_ntoa(iph
->ip_dst
), iph
->ip_id
, iph
->ip_off
,
602 iph
->ip_len
, mtu
, safe_strerror(errno
));
604 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
606 "ospf_write_frags: sent id %d, off %d, len %d to %s\n",
607 iph
->ip_id
, iph
->ip_off
, iph
->ip_len
,
608 inet_ntoa(iph
->ip_dst
));
609 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
611 "-----------------IP Header Dump----------------------");
612 ospf_ip_header_dump(iph
);
614 "-----------------------------------------------------");
618 iph
->ip_off
+= offset
;
619 stream_forward_getp(op
->s
, iovp
->iov_len
);
620 iovp
->iov_base
= stream_pnt(op
->s
);
623 /* setup for final fragment */
624 iovp
->iov_len
= stream_get_endp(op
->s
) - stream_get_getp(op
->s
);
625 iph
->ip_len
= iovp
->iov_len
+ sizeof(struct ip
);
626 iph
->ip_off
&= (~IP_MF
);
628 #endif /* WANT_OSPF_WRITE_FRAGMENT */
630 static int ospf_write(struct thread
*thread
)
632 struct ospf
*ospf
= THREAD_ARG(thread
);
633 struct ospf_interface
*oi
;
634 struct ospf_interface
*last_serviced_oi
= NULL
;
635 struct ospf_packet
*op
;
636 struct sockaddr_in sa_dst
;
643 struct listnode
*node
;
644 #ifdef WANT_OSPF_WRITE_FRAGMENT
645 static u_int16_t ipid
= 0;
646 u_int16_t maxdatasize
;
647 #endif /* WANT_OSPF_WRITE_FRAGMENT */
649 /* clang-format off */
650 #define OSPF_WRITE_IPHL_SHIFT 2
654 unsigned char cmsgbuf
[64] = {};
655 struct cmsghdr
*cm
= (struct cmsghdr
*)cmsgbuf
;
656 struct in_pktinfo
*pi
;
659 ospf
->t_write
= NULL
;
661 node
= listhead(ospf
->oi_write_q
);
663 oi
= listgetdata(node
);
666 #ifdef WANT_OSPF_WRITE_FRAGMENT
667 /* seed ipid static with low order bits of time */
669 ipid
= (time(NULL
) & 0xffff);
670 #endif /* WANT_OSPF_WRITE_FRAGMENT */
672 while ((pkt_count
< ospf
->write_oi_count
) && oi
673 && (last_serviced_oi
!= oi
)) {
674 /* If there is only packet in the queue, the oi is removed from
675 write-q, so fix up the last interface that was serviced */
676 if (last_serviced_oi
== NULL
) {
677 last_serviced_oi
= oi
;
680 #ifdef WANT_OSPF_WRITE_FRAGMENT
681 /* convenience - max OSPF data per packet */
682 maxdatasize
= oi
->ifp
->mtu
- sizeof(struct ip
);
683 #endif /* WANT_OSPF_WRITE_FRAGMENT */
684 /* Get one packet from queue. */
685 op
= ospf_fifo_head(oi
->obuf
);
687 assert(op
->length
>= OSPF_HEADER_SIZE
);
689 if (op
->dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)
690 || op
->dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
691 ospf_if_ipmulticast(ospf
, oi
->address
,
694 /* Rewrite the md5 signature & update the seq */
695 ospf_make_md5_digest(oi
, op
);
697 /* Retrieve OSPF packet type. */
698 stream_set_getp(op
->s
, 1);
699 type
= stream_getc(op
->s
);
701 /* reset get pointer */
702 stream_set_getp(op
->s
, 0);
704 memset(&iph
, 0, sizeof(struct ip
));
705 memset(&sa_dst
, 0, sizeof(sa_dst
));
707 sa_dst
.sin_family
= AF_INET
;
708 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
709 sa_dst
.sin_len
= sizeof(sa_dst
);
710 #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
711 sa_dst
.sin_addr
= op
->dst
;
712 sa_dst
.sin_port
= htons(0);
714 /* Set DONTROUTE flag if dst is unicast. */
715 if (oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
716 if (!IN_MULTICAST(htonl(op
->dst
.s_addr
)))
717 flags
= MSG_DONTROUTE
;
719 iph
.ip_hl
= sizeof(struct ip
) >> OSPF_WRITE_IPHL_SHIFT
;
720 /* it'd be very strange for header to not be 4byte-word aligned
722 if (sizeof(struct ip
)
723 > (unsigned int)(iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
))
724 iph
.ip_hl
++; /* we presume sizeof struct ip cant
727 iph
.ip_v
= IPVERSION
;
728 iph
.ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
729 iph
.ip_len
= (iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
) + op
->length
;
731 #if defined(__DragonFly__)
733 * DragonFly's raw socket expects ip_len/ip_off in network byte
736 iph
.ip_len
= htons(iph
.ip_len
);
739 #ifdef WANT_OSPF_WRITE_FRAGMENT
740 /* XXX-MT: not thread-safe at all..
741 * XXX: this presumes this is only programme sending OSPF
743 * otherwise, no guarantee ipid will be unique
746 #endif /* WANT_OSPF_WRITE_FRAGMENT */
749 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
750 iph
.ip_ttl
= OSPF_VL_IP_TTL
;
752 iph
.ip_ttl
= OSPF_IP_TTL
;
753 iph
.ip_p
= IPPROTO_OSPFIGP
;
755 iph
.ip_src
.s_addr
= oi
->address
->u
.prefix4
.s_addr
;
756 iph
.ip_dst
.s_addr
= op
->dst
.s_addr
;
758 memset(&msg
, 0, sizeof(msg
));
759 msg
.msg_name
= (caddr_t
)&sa_dst
;
760 msg
.msg_namelen
= sizeof(sa_dst
);
764 iov
[0].iov_base
= (char *)&iph
;
765 iov
[0].iov_len
= iph
.ip_hl
<< OSPF_WRITE_IPHL_SHIFT
;
766 iov
[1].iov_base
= stream_pnt(op
->s
);
767 iov
[1].iov_len
= op
->length
;
770 msg
.msg_control
= (caddr_t
)cm
;
771 cm
->cmsg_level
= SOL_IP
;
772 cm
->cmsg_type
= IP_PKTINFO
;
773 cm
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
774 pi
= (struct in_pktinfo
*)CMSG_DATA(cm
);
775 pi
->ipi_ifindex
= oi
->ifp
->ifindex
;
777 msg
.msg_controllen
= cm
->cmsg_len
;
780 /* Sadly we can not rely on kernels to fragment packets
781 * because of either IP_HDRINCL and/or multicast
782 * destination being set.
785 #ifdef WANT_OSPF_WRITE_FRAGMENT
786 if (op
->length
> maxdatasize
)
787 ospf_write_frags(ospf
->fd
, op
, &iph
, &msg
, maxdatasize
,
788 oi
->ifp
->mtu
, flags
, type
);
789 #endif /* WANT_OSPF_WRITE_FRAGMENT */
791 /* send final fragment (could be first) */
792 sockopt_iphdrincl_swab_htosys(&iph
);
793 ret
= sendmsg(ospf
->fd
, &msg
, flags
);
794 sockopt_iphdrincl_swab_systoh(&iph
);
795 if (IS_DEBUG_OSPF_EVENT
)
798 "id %d, off %d, len %d, interface %s, mtu %u:",
799 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
800 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
);
804 "*** sendmsg in ospf_write failed to %s, "
805 "id %d, off %d, len %d, interface %s, mtu %u: %s",
806 inet_ntoa(iph
.ip_dst
), iph
.ip_id
, iph
.ip_off
,
807 iph
.ip_len
, oi
->ifp
->name
, oi
->ifp
->mtu
,
808 safe_strerror(errno
));
810 /* Show debug sending packet. */
811 if (IS_DEBUG_OSPF_PACKET(type
- 1, SEND
)) {
812 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
)) {
814 "-----------------------------------------------------");
815 ospf_ip_header_dump(&iph
);
816 stream_set_getp(op
->s
, 0);
817 ospf_packet_dump(op
->s
);
820 zlog_debug("%s sent to [%s] via [%s].",
821 lookup_msg(ospf_packet_type_str
, type
, NULL
),
822 inet_ntoa(op
->dst
), IF_NAME(oi
));
824 if (IS_DEBUG_OSPF_PACKET(type
- 1, DETAIL
))
826 "-----------------------------------------------------");
833 case OSPF_MSG_DB_DESC
:
836 case OSPF_MSG_LS_REQ
:
839 case OSPF_MSG_LS_UPD
:
842 case OSPF_MSG_LS_ACK
:
849 /* Now delete packet from queue. */
850 ospf_packet_delete(oi
);
852 /* Move this interface to the tail of write_q to
853 serve everyone in a round robin fashion */
854 list_delete_node(ospf
->oi_write_q
, node
);
855 if (ospf_fifo_head(oi
->obuf
) == NULL
) {
857 last_serviced_oi
= NULL
;
860 listnode_add(ospf
->oi_write_q
, oi
);
863 /* Setup to service from the head of the queue again */
864 if (!list_isempty(ospf
->oi_write_q
)) {
865 node
= listhead(ospf
->oi_write_q
);
867 oi
= listgetdata(node
);
872 /* If packets still remain in queue, call write thread. */
873 if (!list_isempty(ospf
->oi_write_q
)) {
874 ospf
->t_write
= NULL
;
875 thread_add_write(master
, ospf_write
, ospf
, ospf
->fd
,
882 /* OSPF Hello message read -- RFC2328 Section 10.5. */
883 static void ospf_hello(struct ip
*iph
, struct ospf_header
*ospfh
,
884 struct stream
*s
, struct ospf_interface
*oi
, int size
)
886 struct ospf_hello
*hello
;
887 struct ospf_neighbor
*nbr
;
891 /* increment statistics. */
894 hello
= (struct ospf_hello
*)stream_pnt(s
);
896 /* If Hello is myself, silently discard. */
897 if (IPV4_ADDR_SAME(&ospfh
->router_id
, &oi
->ospf
->router_id
)) {
898 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
900 "ospf_header[%s/%s]: selforiginated, "
902 lookup_msg(ospf_packet_type_str
, ospfh
->type
,
904 inet_ntoa(iph
->ip_src
));
909 /* get neighbor prefix. */
911 p
.prefixlen
= ip_masklen(hello
->network_mask
);
912 p
.u
.prefix4
= iph
->ip_src
;
914 /* Compare network mask. */
915 /* Checking is ignored for Point-to-Point and Virtual link. */
916 if (oi
->type
!= OSPF_IFTYPE_POINTOPOINT
917 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
918 if (oi
->address
->prefixlen
!= p
.prefixlen
) {
920 "Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).",
921 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
),
922 (int)oi
->address
->prefixlen
, (int)p
.prefixlen
);
926 /* Compare Router Dead Interval. */
927 if (OSPF_IF_PARAM(oi
, v_wait
) != ntohl(hello
->dead_interval
)) {
929 "Packet %s [Hello:RECV]: RouterDeadInterval mismatch "
930 "(expected %u, but received %u).",
931 inet_ntoa(ospfh
->router_id
), OSPF_IF_PARAM(oi
, v_wait
),
932 ntohl(hello
->dead_interval
));
936 /* Compare Hello Interval - ignored if fast-hellos are set. */
937 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0) {
938 if (OSPF_IF_PARAM(oi
, v_hello
)
939 != ntohs(hello
->hello_interval
)) {
941 "Packet %s [Hello:RECV]: HelloInterval mismatch "
942 "(expected %u, but received %u).",
943 inet_ntoa(ospfh
->router_id
),
944 OSPF_IF_PARAM(oi
, v_hello
),
945 ntohs(hello
->hello_interval
));
950 if (IS_DEBUG_OSPF_EVENT
)
951 zlog_debug("Packet %s [Hello:RECV]: Options %s vrf %s",
952 inet_ntoa(ospfh
->router_id
),
953 ospf_options_dump(hello
->options
),
954 ospf_vrf_id_to_name(oi
->ospf
->vrf_id
));
956 /* Compare options. */
957 #define REJECT_IF_TBIT_ON 1 /* XXX */
958 #ifdef REJECT_IF_TBIT_ON
959 if (CHECK_FLAG(hello
->options
, OSPF_OPTION_MT
)) {
961 * This router does not support non-zero TOS.
962 * Drop this Hello packet not to establish neighbor
965 zlog_warn("Packet %s [Hello:RECV]: T-bit on, drop it.",
966 inet_ntoa(ospfh
->router_id
));
969 #endif /* REJECT_IF_TBIT_ON */
971 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)
972 && CHECK_FLAG(hello
->options
, OSPF_OPTION_O
)) {
974 * This router does know the correct usage of O-bit
975 * the bit should be set in DD packet only.
977 zlog_warn("Packet %s [Hello:RECV]: O-bit abuse?",
978 inet_ntoa(ospfh
->router_id
));
979 #ifdef STRICT_OBIT_USAGE_CHECK
980 return; /* Reject this packet. */
981 #else /* STRICT_OBIT_USAGE_CHECK */
982 UNSET_FLAG(hello
->options
, OSPF_OPTION_O
); /* Ignore O-bit. */
983 #endif /* STRICT_OBIT_USAGE_CHECK */
986 /* new for NSSA is to ensure that NP is on and E is off */
988 if (oi
->area
->external_routing
== OSPF_AREA_NSSA
) {
989 if (!(CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_NP
)
990 && CHECK_FLAG(hello
->options
, OSPF_OPTION_NP
)
991 && !CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
992 && !CHECK_FLAG(hello
->options
, OSPF_OPTION_E
))) {
994 "NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x",
995 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
999 if (IS_DEBUG_OSPF_NSSA
)
1000 zlog_debug("NSSA-Hello:RECV:Packet from %s:",
1001 inet_ntoa(ospfh
->router_id
));
1003 /* The setting of the E-bit found in the Hello Packet's Options
1004 field must match this area's ExternalRoutingCapability A
1005 mismatch causes processing to stop and the packet to be
1006 dropped. The setting of the rest of the bits in the Hello
1007 Packet's Options field should be ignored. */
1008 if (CHECK_FLAG(OPTIONS(oi
), OSPF_OPTION_E
)
1009 != CHECK_FLAG(hello
->options
, OSPF_OPTION_E
)) {
1011 "Packet %s [Hello:RECV]: my options: %x, his options %x",
1012 inet_ntoa(ospfh
->router_id
), OPTIONS(oi
),
1017 /* get neighbour struct */
1018 nbr
= ospf_nbr_get(oi
, ospfh
, iph
, &p
);
1020 /* neighbour must be valid, ospf_nbr_get creates if none existed */
1023 old_state
= nbr
->state
;
1025 /* Add event to thread. */
1026 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1028 /* RFC2328 Section 9.5.1
1029 If the router is not eligible to become Designated Router,
1030 (snip) It must also send an Hello Packet in reply to an
1031 Hello Packet received from any eligible neighbor (other than
1032 the current Designated Router and Backup Designated Router). */
1033 if (oi
->type
== OSPF_IFTYPE_NBMA
)
1034 if (PRIORITY(oi
) == 0 && hello
->priority
> 0
1035 && IPV4_ADDR_CMP(&DR(oi
), &iph
->ip_src
)
1036 && IPV4_ADDR_CMP(&BDR(oi
), &iph
->ip_src
))
1037 OSPF_NSM_TIMER_ON(nbr
->t_hello_reply
,
1038 ospf_hello_reply_timer
,
1039 OSPF_HELLO_REPLY_DELAY
);
1041 /* on NBMA network type, it happens to receive bidirectional Hello
1043 without advance 1-Way Received event.
1044 To avoid incorrect DR-seletion, raise 1-Way Received event.*/
1045 if (oi
->type
== OSPF_IFTYPE_NBMA
1046 && (old_state
== NSM_Down
|| old_state
== NSM_Attempt
)) {
1047 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1048 nbr
->priority
= hello
->priority
;
1049 nbr
->d_router
= hello
->d_router
;
1050 nbr
->bd_router
= hello
->bd_router
;
1054 if (ospf_nbr_bidirectional(&oi
->ospf
->router_id
, hello
->neighbors
,
1055 size
- OSPF_HELLO_MIN_SIZE
)) {
1056 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_TwoWayReceived
);
1057 nbr
->options
|= hello
->options
;
1059 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_OneWayReceived
);
1060 /* Set neighbor information. */
1061 nbr
->priority
= hello
->priority
;
1062 nbr
->d_router
= hello
->d_router
;
1063 nbr
->bd_router
= hello
->bd_router
;
1067 /* If neighbor itself declares DR and no BDR exists,
1068 cause event BackupSeen */
1069 if (IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
))
1070 if (hello
->bd_router
.s_addr
== 0 && oi
->state
== ISM_Waiting
)
1071 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1073 /* neighbor itself declares BDR. */
1074 if (oi
->state
== ISM_Waiting
1075 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
))
1076 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_BackupSeen
);
1078 /* had not previously. */
1079 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1080 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->d_router
))
1081 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->d_router
)
1082 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->d_router
)))
1083 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1085 /* had not previously. */
1086 if ((IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1087 && IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
))
1088 || (IPV4_ADDR_CMP(&nbr
->address
.u
.prefix4
, &hello
->bd_router
)
1089 && IPV4_ADDR_SAME(&nbr
->address
.u
.prefix4
, &nbr
->bd_router
)))
1090 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1092 /* Neighbor priority check. */
1093 if (nbr
->priority
>= 0 && nbr
->priority
!= hello
->priority
)
1094 OSPF_ISM_EVENT_SCHEDULE(oi
, ISM_NeighborChange
);
1096 /* Set neighbor information. */
1097 nbr
->priority
= hello
->priority
;
1098 nbr
->d_router
= hello
->d_router
;
1099 nbr
->bd_router
= hello
->bd_router
;
1102 /* Save DD flags/options/Seqnum received. */
1103 static void ospf_db_desc_save_current(struct ospf_neighbor
*nbr
,
1104 struct ospf_db_desc
*dd
)
1106 nbr
->last_recv
.flags
= dd
->flags
;
1107 nbr
->last_recv
.options
= dd
->options
;
1108 nbr
->last_recv
.dd_seqnum
= ntohl(dd
->dd_seqnum
);
1111 /* Process rest of DD packet. */
1112 static void ospf_db_desc_proc(struct stream
*s
, struct ospf_interface
*oi
,
1113 struct ospf_neighbor
*nbr
,
1114 struct ospf_db_desc
*dd
, u_int16_t size
)
1116 struct ospf_lsa
*new, *find
;
1117 struct lsa_header
*lsah
;
1119 stream_forward_getp(s
, OSPF_DB_DESC_MIN_SIZE
);
1120 for (size
-= OSPF_DB_DESC_MIN_SIZE
; size
>= OSPF_LSA_HEADER_SIZE
;
1121 size
-= OSPF_LSA_HEADER_SIZE
) {
1122 lsah
= (struct lsa_header
*)stream_pnt(s
);
1123 stream_forward_getp(s
, OSPF_LSA_HEADER_SIZE
);
1125 /* Unknown LS type. */
1126 if (lsah
->type
< OSPF_MIN_LSA
|| lsah
->type
>= OSPF_MAX_LSA
) {
1127 zlog_warn("Packet [DD:RECV]: Unknown LS type %d.",
1129 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1133 if (IS_OPAQUE_LSA(lsah
->type
)
1134 && !CHECK_FLAG(nbr
->options
, OSPF_OPTION_O
)) {
1135 zlog_warn("LSA[Type%d:%s]: Opaque capability mismatch?",
1136 lsah
->type
, inet_ntoa(lsah
->id
));
1137 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_SeqNumberMismatch
);
1141 switch (lsah
->type
) {
1142 case OSPF_AS_EXTERNAL_LSA
:
1143 case OSPF_OPAQUE_AS_LSA
:
1144 /* Check for stub area. Reject if AS-External from stub
1146 allow if from NSSA. */
1147 if (oi
->area
->external_routing
== OSPF_AREA_STUB
) {
1149 "Packet [DD:RECV]: LSA[Type%d:%s] from %s area.",
1150 lsah
->type
, inet_ntoa(lsah
->id
),
1151 (oi
->area
->external_routing
1155 OSPF_NSM_EVENT_SCHEDULE(nbr
,
1156 NSM_SeqNumberMismatch
);
1164 /* Create LS-request object. */
1165 new = ospf_ls_request_new(lsah
);
1167 /* Lookup received LSA, then add LS request list. */
1168 find
= ospf_lsa_lookup_by_header(oi
->area
, lsah
);
1170 /* ospf_lsa_more_recent is fine with NULL pointers */
1171 switch (ospf_lsa_more_recent(find
, new)) {
1173 /* Neighbour has a more recent LSA, we must request it
1175 ospf_ls_request_add(nbr
, new);
1178 /* If we have a copy of this LSA, it's either less
1180 * and we're requesting it from neighbour (the case
1182 * it's as recent and we both have same copy (this
1185 * In neither of these two cases is there any point in
1186 * describing our copy of the LSA to the neighbour in a
1187 * DB-Summary packet, if we're still intending to do so.
1189 * See: draft-ogier-ospf-dbex-opt-00.txt, describing the
1190 * backward compatible optimisation to OSPF DB Exchange
1192 * DB Description process implemented here.
1195 ospf_lsdb_delete(&nbr
->db_sum
, find
);
1196 ospf_lsa_discard(new);
1199 /* We have the more recent copy, nothing specific to do:
1200 * - no need to request neighbours stale copy
1201 * - must leave DB summary list copy alone
1203 if (IS_DEBUG_OSPF_EVENT
)
1205 "Packet [DD:RECV]: LSA received Type %d, "
1206 "ID %s is not recent.",
1207 lsah
->type
, inet_ntoa(lsah
->id
));
1208 ospf_lsa_discard(new);
1213 if (IS_SET_DD_MS(nbr
->dd_flags
)) {
1216 /* Both sides have no More, then we're done with Exchange */
1217 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1218 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1220 ospf_db_desc_send(nbr
);
1224 nbr
->dd_seqnum
= ntohl(dd
->dd_seqnum
);
1226 /* Send DD packet in reply.
1228 * Must be done to acknowledge the Master's DD, regardless of
1229 * whether we have more LSAs ourselves to describe.
1231 * This function will clear the 'More' bit, if after this DD
1232 * we have no more LSAs to describe to the master..
1234 ospf_db_desc_send(nbr
);
1236 /* Slave can raise ExchangeDone now, if master is also done */
1237 if (!IS_SET_DD_M(dd
->flags
) && !IS_SET_DD_M(nbr
->dd_flags
))
1238 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_ExchangeDone
);
1241 /* Save received neighbor values from DD. */
1242 ospf_db_desc_save_current(nbr
, dd
);
1245 ospf_ls_req_send(nbr
);
1248 static int ospf_db_desc_is_dup(struct ospf_db_desc
*dd
,
1249 struct ospf_neighbor
*nbr
)
1251 /* Is DD duplicated? */
1252 if (dd
->options
== nbr
->last_recv
.options
1253 && dd
->flags
== nbr
->last_recv
.flags
1254 && dd
->dd_seqnum
== htonl(nbr
->last_recv
.dd_seqnum
))
1260 /* OSPF Database Description message read -- RFC2328 Section 10.6. */
1261 static void ospf_db_desc(struct ip
*iph
, struct ospf_header
*ospfh
,
1262 struct stream
*s
, struct ospf_interface
*oi
,
1265 struct ospf_db_desc
*dd
;
1266 struct ospf_neighbor
*nbr
;
1268 /* Increment statistics. */
1271 dd
= (struct ospf_db_desc
*)stream_pnt(s
);
1273 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1275 zlog_warn("Packet[DD]: Unknown Neighbor %s",
1276 inet_ntoa(ospfh
->router_id
));
1281 if ((OSPF_IF_PARAM(oi
, mtu_ignore
) == 0)
1282 && (ntohs(dd
->mtu
) > oi
->ifp
->mtu
)) {
1284 "Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u",
1285 inet_ntoa(nbr
->router_id
), ntohs(dd
->mtu
), IF_NAME(oi
),
1291 * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is
1293 * required. In fact at least JunOS sends DD packets with P bit clear.
1294 * Until proper solution is developped, this hack should help.
1296 * Update: According to the RFCs, N bit is specified /only/ for Hello
1297 * options, unfortunately its use in DD options is not specified. Hence
1299 * implementations follow E-bit semantics and set it in DD options, and
1301 * treat it as unspecified and hence follow the directive "default for
1302 * options is clear", ie unset.
1304 * Reset the flag, as ospfd follows E-bit semantics.
1306 if ((oi
->area
->external_routing
== OSPF_AREA_NSSA
)
1307 && (CHECK_FLAG(nbr
->options
, OSPF_OPTION_NP
))
1308 && (!CHECK_FLAG(dd
->options
, OSPF_OPTION_NP
))) {
1309 if (IS_DEBUG_OSPF_EVENT
)
1311 "Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options",
1312 inet_ntoa(nbr
->router_id
));
1313 SET_FLAG(dd
->options
, OSPF_OPTION_NP
);
1316 #ifdef REJECT_IF_TBIT_ON
1317 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_MT
)) {
1319 * In Hello protocol, optional capability must have checked
1320 * to prevent this T-bit enabled router be my neighbor.
1322 zlog_warn("Packet[DD]: Neighbor %s: T-bit on?",
1323 inet_ntoa(nbr
->router_id
));
1326 #endif /* REJECT_IF_TBIT_ON */
1328 if (CHECK_FLAG(dd
->options
, OSPF_OPTION_O
)
1329 && !CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
)) {
1331 * This node is not configured to handle O-bit, for now.
1332 * Clear it to ignore unsupported capability proposed by
1335 UNSET_FLAG(dd
->options
, OSPF_OPTION_O
);
1338 /* Add event to thread. */
1339 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1341 /* Process DD packet by neighbor status. */
1342 switch (nbr
->state
) {
1347 "Packet[DD]: Neighbor %s state is %s, packet discarded.",
1348 inet_ntoa(nbr
->router_id
),
1349 lookup_msg(ospf_nsm_state_msg
, nbr
->state
, NULL
));
1352 OSPF_NSM_EVENT_EXECUTE(nbr
, NSM_TwoWayReceived
);
1353 /* If the new state is ExStart, the processing of the current
1354 packet should then continue in this new state by falling
1355 through to case ExStart below. */
1356 if (nbr
->state
!= NSM_ExStart
)
1361 if ((IS_SET_DD_ALL(dd
->flags
) == OSPF_DD_FLAG_ALL
)
1362 && (size
== OSPF_DB_DESC_MIN_SIZE
)) {
1363 if (IPV4_ADDR_CMP(&nbr
->router_id
, &oi
->ospf
->router_id
)
1365 /* We're Slave---obey */
1366 if (CHECK_FLAG(oi
->ospf
->config
,
1367 OSPF_LOG_ADJACENCY_DETAIL
))
1368 zlog_info("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
,
1639 OSPF_SEND_PACKET_DIRECT
, 0);
1641 ospf_ls_upd_send(nbr
, ls_upd
,
1642 OSPF_SEND_PACKET_INDIRECT
, 0);
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 u_int16_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();
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 lsa
->data
= ospf_lsa_data_new(length
);
1765 memcpy(lsa
->data
, lsah
, length
);
1767 if (IS_DEBUG_OSPF_EVENT
)
1769 "LSA[Type%d:%s]: %p new LSA created with Link State Update",
1770 lsa
->data
->type
, inet_ntoa(lsa
->data
->id
),
1772 listnode_add(lsas
, lsa
);
1778 /* Cleanup Update list. */
1779 static void ospf_upd_list_clean(struct list
*lsas
)
1781 struct listnode
*node
, *nnode
;
1782 struct ospf_lsa
*lsa
;
1784 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
))
1785 ospf_lsa_discard(lsa
);
1787 list_delete_and_null(&lsas
);
1790 /* OSPF Link State Update message read -- RFC2328 Section 13. */
1791 static void ospf_ls_upd(struct ospf
*ospf
, struct ip
*iph
,
1792 struct ospf_header
*ospfh
, struct stream
*s
,
1793 struct ospf_interface
*oi
, u_int16_t size
)
1795 struct ospf_neighbor
*nbr
;
1797 struct listnode
*node
, *nnode
;
1798 struct ospf_lsa
*lsa
= NULL
;
1799 /* unsigned long ls_req_found = 0; */
1801 /* Dis-assemble the stream, update each entry, re-encapsulate for
1804 /* Increment statistics. */
1807 /* Check neighbor. */
1808 nbr
= ospf_nbr_lookup(oi
, iph
, ospfh
);
1810 zlog_warn("Link State Update: Unknown Neighbor %s on int: %s",
1811 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
1815 /* Add event to thread. */
1816 OSPF_NSM_EVENT_SCHEDULE(nbr
, NSM_PacketReceived
);
1818 /* Check neighbor state. */
1819 if (nbr
->state
< NSM_Exchange
) {
1820 if (IS_DEBUG_OSPF(nsm
, NSM_EVENTS
))
1822 "Link State Update: "
1823 "Neighbor[%s] state %s is less than Exchange",
1824 inet_ntoa(ospfh
->router_id
),
1825 lookup_msg(ospf_nsm_state_msg
, nbr
->state
,
1830 /* Get list of LSAs from Link State Update packet. - Also perorms Stages
1831 * 1 (validate LSA checksum) and 2 (check for LSA consistent type)
1834 lsas
= ospf_ls_upd_list_lsa(nbr
, s
, oi
, size
);
1838 #define DISCARD_LSA(L, N) \
1840 if (IS_DEBUG_OSPF_EVENT) \
1842 "ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p" \
1844 N, (void *)lsa, (int)lsa->data->type); \
1845 ospf_lsa_discard(L); \
1849 /* Process each LSA received in the one packet.
1851 * Numbers in parentheses, e.g. (1), (2), etc., and the corresponding
1852 * text below are from the steps in RFC 2328, Section 13.
1854 for (ALL_LIST_ELEMENTS(lsas
, node
, nnode
, lsa
)) {
1855 struct ospf_lsa
*ls_ret
, *current
;
1858 if (IS_DEBUG_OSPF_NSSA
) {
1859 char buf1
[INET_ADDRSTRLEN
];
1860 char buf2
[INET_ADDRSTRLEN
];
1861 char buf3
[INET_ADDRSTRLEN
];
1863 zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s",
1865 inet_ntop(AF_INET
, &ospfh
->router_id
, buf1
,
1867 inet_ntop(AF_INET
, &lsa
->data
->id
, buf2
,
1869 inet_ntop(AF_INET
, &lsa
->data
->adv_router
,
1870 buf3
, INET_ADDRSTRLEN
));
1873 listnode_delete(lsas
,
1874 lsa
); /* We don't need it in list anymore */
1876 /* (1) Validate Checksum - Done above by ospf_ls_upd_list_lsa()
1879 /* (2) LSA Type - Done above by ospf_ls_upd_list_lsa() */
1881 /* (3) Do not take in AS External LSAs if we are a stub or NSSA.
1884 /* Do not take in AS NSSA if this neighbor and we are not NSSA
1887 /* Do take in Type-7's if we are an NSSA */
1889 /* If we are also an ABR, later translate them to a Type-5
1892 /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will
1893 translate them to a separate Type-5 packet. */
1895 if (lsa
->data
->type
== OSPF_AS_EXTERNAL_LSA
)
1896 /* Reject from STUB or NSSA */
1897 if (nbr
->oi
->area
->external_routing
1898 != OSPF_AREA_DEFAULT
) {
1899 if (IS_DEBUG_OSPF_NSSA
)
1901 "Incoming External LSA Discarded: We are NSSA/STUB Area");
1902 DISCARD_LSA(lsa
, 1);
1905 if (lsa
->data
->type
== OSPF_AS_NSSA_LSA
)
1906 if (nbr
->oi
->area
->external_routing
!= OSPF_AREA_NSSA
) {
1907 if (IS_DEBUG_OSPF_NSSA
)
1909 "Incoming NSSA LSA Discarded: Not NSSA Area");
1910 DISCARD_LSA(lsa
, 2);
1913 /* VU229804: Router-LSA Adv-ID must be equal to LS-ID */
1914 if (lsa
->data
->type
== OSPF_ROUTER_LSA
)
1915 if (!IPV4_ADDR_SAME(&lsa
->data
->id
,
1916 &lsa
->data
->adv_router
)) {
1917 char buf1
[INET_ADDRSTRLEN
];
1918 char buf2
[INET_ADDRSTRLEN
];
1919 char buf3
[INET_ADDRSTRLEN
];
1922 "Incoming Router-LSA from %s with "
1923 "Adv-ID[%s] != LS-ID[%s]",
1924 inet_ntop(AF_INET
, &ospfh
->router_id
,
1925 buf1
, INET_ADDRSTRLEN
),
1926 inet_ntop(AF_INET
, &lsa
->data
->id
, buf2
,
1929 &lsa
->data
->adv_router
, buf3
,
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
, (u_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 u_int16_t iface_auth_type
;
2424 u_int16_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() */
2493 NULL
== (ck
= listgetdata(listtail(
2494 OSPF_IF_PARAM(oi
, auth_crypt
))))
2495 || ospfh
->u
.crypt
.key_id
!= ck
->key_id
||
2496 /* Condition above uses the last key ID on the list,
2498 different from what ospf_crypt_key_lookup() does. A
2500 !ospf_check_md5_digest(oi
, ospfh
)) {
2501 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2502 zlog_warn("interface %s: MD5 auth failed",
2508 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
))
2510 "interface %s: invalid packet auth-type (%02x)",
2511 IF_NAME(oi
), pkt_auth_type
);
2516 static int ospf_check_sum(struct ospf_header
*ospfh
)
2521 /* clear auth_data for checksum. */
2522 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
2524 /* keep checksum and clear. */
2525 sum
= ospfh
->checksum
;
2526 memset(&ospfh
->checksum
, 0, sizeof(u_int16_t
));
2528 /* calculate checksum. */
2529 ret
= in_cksum(ospfh
, ntohs(ospfh
->length
));
2532 zlog_info("ospf_check_sum(): checksum mismatch, my %X, his %X",
2540 /* Verify, that given link/TOS records are properly sized/aligned and match
2541 Router-LSA "# links" and "# TOS" fields as specified in RFC2328 A.4.2. */
2542 static unsigned ospf_router_lsa_links_examin(struct router_lsa_link
*link
,
2543 u_int16_t linkbytes
,
2544 const u_int16_t num_links
)
2546 unsigned counted_links
= 0, thislinklen
;
2550 OSPF_ROUTER_LSA_LINK_SIZE
+ 4 * link
->m
[0].tos_count
;
2551 if (thislinklen
> linkbytes
) {
2552 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2553 zlog_debug("%s: length error in link block #%u",
2554 __func__
, counted_links
);
2557 link
= (struct router_lsa_link
*)((caddr_t
)link
+ thislinklen
);
2558 linkbytes
-= thislinklen
;
2561 if (counted_links
!= num_links
) {
2562 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2563 zlog_debug("%s: %u link blocks declared, %u present",
2564 __func__
, num_links
, counted_links
);
2570 /* Verify, that the given LSA is properly sized/aligned (including type-specific
2571 minimum length constraint). */
2572 static unsigned ospf_lsa_examin(struct lsa_header
*lsah
, const u_int16_t lsalen
,
2573 const u_char headeronly
)
2576 struct router_lsa
*rlsa
;
2577 if (lsah
->type
< OSPF_MAX_LSA
&& ospf_lsa_minlen
[lsah
->type
]
2578 && lsalen
< OSPF_LSA_HEADER_SIZE
+ ospf_lsa_minlen
[lsah
->type
]) {
2579 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2580 zlog_debug("%s: undersized (%u B) %s", __func__
, lsalen
,
2581 lookup_msg(ospf_lsa_type_msg
, lsah
->type
,
2585 switch (lsah
->type
) {
2586 case OSPF_ROUTER_LSA
:
2587 /* RFC2328 A.4.2, LSA header + 4 bytes followed by N>=1
2588 * (12+)-byte link blocks */
2590 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2591 - OSPF_ROUTER_LSA_MIN_SIZE
)
2597 rlsa
= (struct router_lsa
*)lsah
;
2598 ret
= ospf_router_lsa_links_examin(
2599 (struct router_lsa_link
*)rlsa
->link
,
2600 lsalen
- OSPF_LSA_HEADER_SIZE
- 4, /* skip: basic
2603 ntohs(rlsa
->links
) /* 16 bits */
2606 case OSPF_AS_EXTERNAL_LSA
:
2607 /* RFC2328 A.4.5, LSA header + 4 bytes followed by N>=1 12-bytes long
2609 case OSPF_AS_NSSA_LSA
:
2610 /* RFC3101 C, idem */
2611 ret
= (lsalen
- OSPF_LSA_HEADER_SIZE
2612 - OSPF_AS_EXTERNAL_LSA_MIN_SIZE
)
2617 /* Following LSA types are considered OK length-wise as soon as their
2619 * length constraint is met and length of the whole LSA is a multiple of
2621 * (basic LSA header size is already a multiple of 4). */
2622 case OSPF_NETWORK_LSA
:
2623 /* RFC2328 A.4.3, LSA header + 4 bytes followed by N>=1 router-IDs */
2624 case OSPF_SUMMARY_LSA
:
2625 case OSPF_ASBR_SUMMARY_LSA
:
2626 /* RFC2328 A.4.4, LSA header + 4 bytes followed by N>=1 4-bytes TOS
2628 case OSPF_OPAQUE_LINK_LSA
:
2629 case OSPF_OPAQUE_AREA_LSA
:
2630 case OSPF_OPAQUE_AS_LSA
:
2631 /* RFC5250 A.2, "some number of octets (of application-specific
2632 * data) padded to 32-bit alignment." This is considered
2634 * to 4-byte alignment of all other LSA types, see
2635 * OSPF-ALIGNMENT.txt
2636 * file for the detailed analysis of this passage. */
2637 ret
= lsalen
% 4 ? MSG_NG
: MSG_OK
;
2640 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2641 zlog_debug("%s: unsupported LSA type 0x%02x", __func__
,
2645 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2646 zlog_debug("%s: alignment error in %s", __func__
,
2647 lookup_msg(ospf_lsa_type_msg
, lsah
->type
, NULL
));
2651 /* Verify if the provided input buffer is a valid sequence of LSAs. This
2652 includes verification of LSA blocks length/alignment and dispatching
2653 of deeper-level checks. */
2655 ospf_lsaseq_examin(struct lsa_header
*lsah
, /* start of buffered data */
2656 size_t length
, const u_char headeronly
,
2657 /* When declared_num_lsas is not 0, compare it to the real
2659 and treat the difference as an error. */
2660 const u_int32_t declared_num_lsas
)
2662 u_int32_t counted_lsas
= 0;
2666 if (length
< OSPF_LSA_HEADER_SIZE
) {
2667 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2669 "%s: undersized (%zu B) trailing (#%u) LSA header",
2670 __func__
, length
, counted_lsas
);
2673 /* save on ntohs() calls here and in the LSA validator */
2674 lsalen
= ntohs(lsah
->length
);
2675 if (lsalen
< OSPF_LSA_HEADER_SIZE
) {
2676 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2678 "%s: malformed LSA header #%u, declared length is %u B",
2679 __func__
, counted_lsas
, lsalen
);
2683 /* less checks here and in ospf_lsa_examin() */
2684 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 1)) {
2685 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2687 "%s: malformed header-only LSA #%u",
2688 __func__
, counted_lsas
);
2691 lsah
= (struct lsa_header
*)((caddr_t
)lsah
2692 + OSPF_LSA_HEADER_SIZE
);
2693 length
-= OSPF_LSA_HEADER_SIZE
;
2695 /* make sure the input buffer is deep enough before
2697 if (lsalen
> length
) {
2698 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2700 "%s: anomaly in LSA #%u: declared length is %u B, buffered length is %zu B",
2701 __func__
, counted_lsas
, lsalen
,
2705 if (MSG_OK
!= ospf_lsa_examin(lsah
, lsalen
, 0)) {
2706 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2707 zlog_debug("%s: malformed LSA #%u",
2708 __func__
, counted_lsas
);
2711 lsah
= (struct lsa_header
*)((caddr_t
)lsah
+ lsalen
);
2717 if (declared_num_lsas
&& counted_lsas
!= declared_num_lsas
) {
2718 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2720 "%s: #LSAs declared (%u) does not match actual (%u)",
2721 __func__
, declared_num_lsas
, counted_lsas
);
2727 /* Verify a complete OSPF packet for proper sizing/alignment. */
2728 static unsigned ospf_packet_examin(struct ospf_header
*oh
,
2729 const unsigned bytesonwire
)
2731 u_int16_t bytesdeclared
, bytesauth
;
2733 struct ospf_ls_update
*lsupd
;
2735 /* Length, 1st approximation. */
2736 if (bytesonwire
< OSPF_HEADER_SIZE
) {
2737 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2738 zlog_debug("%s: undersized (%u B) packet", __func__
,
2742 /* Now it is safe to access header fields. Performing length check,
2744 * for possible extra bytes of crypto auth/padding, which are not
2746 * in the OSPF header "length" field. */
2747 if (oh
->version
!= OSPF_VERSION
) {
2748 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2749 zlog_debug("%s: invalid (%u) protocol version",
2750 __func__
, oh
->version
);
2753 bytesdeclared
= ntohs(oh
->length
);
2754 if (ntohs(oh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
2757 if (oh
->u
.crypt
.auth_data_len
!= OSPF_AUTH_MD5_SIZE
) {
2758 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2760 "%s: unsupported crypto auth length (%u B)",
2761 __func__
, oh
->u
.crypt
.auth_data_len
);
2764 bytesauth
= OSPF_AUTH_MD5_SIZE
;
2766 if (bytesdeclared
+ bytesauth
> bytesonwire
) {
2767 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2769 "%s: packet length error (%u real, %u+%u declared)",
2770 __func__
, bytesonwire
, bytesdeclared
,
2774 /* Length, 2nd approximation. The type-specific constraint is checked
2775 against declared length, not amount of bytes on wire. */
2776 if (oh
->type
>= OSPF_MSG_HELLO
&& oh
->type
<= OSPF_MSG_LS_ACK
2778 < OSPF_HEADER_SIZE
+ ospf_packet_minlen
[oh
->type
]) {
2779 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2780 zlog_debug("%s: undersized (%u B) %s packet", __func__
,
2782 lookup_msg(ospf_packet_type_str
, oh
->type
,
2787 case OSPF_MSG_HELLO
:
2788 /* RFC2328 A.3.2, packet header + OSPF_HELLO_MIN_SIZE bytes
2790 by N>=0 router-IDs. */
2791 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_HELLO_MIN_SIZE
)
2796 case OSPF_MSG_DB_DESC
:
2797 /* RFC2328 A.3.3, packet header + OSPF_DB_DESC_MIN_SIZE bytes
2799 by N>=0 header-only LSAs. */
2800 ret
= ospf_lsaseq_examin(
2801 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2802 + OSPF_DB_DESC_MIN_SIZE
),
2803 bytesdeclared
- OSPF_HEADER_SIZE
2804 - OSPF_DB_DESC_MIN_SIZE
,
2805 1, /* header-only LSAs */
2808 case OSPF_MSG_LS_REQ
:
2809 /* RFC2328 A.3.4, packet header followed by N>=0 12-bytes
2810 * request blocks. */
2811 ret
= (bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_REQ_MIN_SIZE
)
2816 case OSPF_MSG_LS_UPD
:
2817 /* RFC2328 A.3.5, packet header + OSPF_LS_UPD_MIN_SIZE bytes
2819 by N>=0 full LSAs (with N declared beforehand). */
2820 lsupd
= (struct ospf_ls_update
*)((caddr_t
)oh
2821 + OSPF_HEADER_SIZE
);
2822 ret
= ospf_lsaseq_examin(
2823 (struct lsa_header
*)((caddr_t
)lsupd
2824 + OSPF_LS_UPD_MIN_SIZE
),
2825 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_UPD_MIN_SIZE
,
2827 ntohl(lsupd
->num_lsas
) /* 32 bits */
2830 case OSPF_MSG_LS_ACK
:
2831 /* RFC2328 A.3.6, packet header followed by N>=0 header-only
2833 ret
= ospf_lsaseq_examin(
2834 (struct lsa_header
*)((caddr_t
)oh
+ OSPF_HEADER_SIZE
2835 + OSPF_LS_ACK_MIN_SIZE
),
2836 bytesdeclared
- OSPF_HEADER_SIZE
- OSPF_LS_ACK_MIN_SIZE
,
2837 1, /* header-only LSAs */
2841 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2842 zlog_debug("%s: invalid packet type 0x%02x", __func__
,
2846 if (ret
!= MSG_OK
&& IS_DEBUG_OSPF_PACKET(0, RECV
))
2847 zlog_debug("%s: malformed %s packet", __func__
,
2848 lookup_msg(ospf_packet_type_str
, oh
->type
, NULL
));
2852 /* OSPF Header verification. */
2853 static int ospf_verify_header(struct stream
*ibuf
, struct ospf_interface
*oi
,
2854 struct ip
*iph
, struct ospf_header
*ospfh
)
2856 /* Check Area ID. */
2857 if (!ospf_check_area_id(oi
, ospfh
)) {
2858 zlog_warn("interface %s: ospf_read invalid Area ID %s.",
2859 IF_NAME(oi
), inet_ntoa(ospfh
->area_id
));
2863 /* Check network mask, Silently discarded. */
2864 if (!ospf_check_network_mask(oi
, iph
->ip_src
)) {
2866 "interface %s: ospf_read network address is not same [%s]",
2867 IF_NAME(oi
), inet_ntoa(iph
->ip_src
));
2871 /* Check authentication. The function handles logging actions, where
2873 if (!ospf_check_auth(oi
, ospfh
))
2879 /* Starting point of packet process function. */
2880 int ospf_read(struct thread
*thread
)
2883 struct stream
*ibuf
;
2885 struct ospf_interface
*oi
;
2887 struct ospf_header
*ospfh
;
2889 struct interface
*ifp
= NULL
;
2890 struct connected
*c
;
2892 /* first of all get interface pointer. */
2893 ospf
= THREAD_ARG(thread
);
2895 /* prepare for next packet. */
2896 ospf
->t_read
= NULL
;
2897 thread_add_read(master
, ospf_read
, ospf
, ospf
->fd
, &ospf
->t_read
);
2899 stream_reset(ospf
->ibuf
);
2900 ibuf
= ospf_recv_packet(ospf
, ospf
->fd
, &ifp
, ospf
->ibuf
);
2903 /* This raw packet is known to be at least as big as its IP header. */
2905 /* Note that there should not be alignment problems with this assignment
2906 because this is at the beginning of the stream data buffer. */
2907 iph
= (struct ip
*)STREAM_DATA(ibuf
);
2908 /* Note that sockopt_iphdrincl_swab_systoh was called in
2909 * ospf_recv_packet. */
2912 /* Handle cases where the platform does not support retrieving
2914 and also platforms (such as Solaris 8) that claim to support
2916 retrieval but do not. */
2917 c
= if_lookup_address((void *)&iph
->ip_src
, AF_INET
,
2925 /* IP Header dump. */
2926 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
2927 ospf_ip_header_dump(iph
);
2929 /* Self-originated packet should be discarded silently. */
2930 if (ospf_if_lookup_by_local_addr(ospf
, NULL
, iph
->ip_src
)) {
2931 if (IS_DEBUG_OSPF_PACKET(0, RECV
)) {
2933 "ospf_read[%s]: Dropping self-originated packet",
2934 inet_ntoa(iph
->ip_src
));
2939 /* Advance from IP header to OSPF header (iph->ip_hl has been verified
2940 by ospf_recv_packet() to be correct). */
2941 stream_forward_getp(ibuf
, iph
->ip_hl
* 4);
2943 ospfh
= (struct ospf_header
*)stream_pnt(ibuf
);
2945 != ospf_packet_examin(
2946 ospfh
, stream_get_endp(ibuf
) - stream_get_getp(ibuf
)))
2948 /* Now it is safe to access all fields of OSPF packet header. */
2950 /* associate packet with ospf interface */
2951 oi
= ospf_if_lookup_recv_if(ospf
, iph
->ip_src
, ifp
);
2953 /* ospf_verify_header() relies on a valid "oi" and thus can be called
2955 after the passive/backbone/other checks below are passed. These
2957 in turn access the fields of unverified "ospfh" structure for their
2959 purposes and must remain very accurate in doing this. */
2961 /* If incoming interface is passive one, ignore it. */
2962 if (oi
&& OSPF_IF_PASSIVE_STATUS(oi
) == OSPF_IF_PASSIVE
) {
2963 char buf
[3][INET_ADDRSTRLEN
];
2965 if (IS_DEBUG_OSPF_EVENT
)
2967 "ignoring packet from router %s sent to %s, "
2968 "received on a passive interface, %s",
2969 inet_ntop(AF_INET
, &ospfh
->router_id
, buf
[0],
2971 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
2973 inet_ntop(AF_INET
, &oi
->address
->u
.prefix4
,
2974 buf
[2], sizeof(buf
[2])));
2976 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
)) {
2977 /* Try to fix multicast membership.
2978 * Some OS:es may have problems in this area,
2979 * make sure it is removed.
2981 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
2982 ospf_if_set_multicast(oi
);
2988 /* if no local ospf_interface,
2989 * or header area is backbone but ospf_interface is not
2990 * check for VLINK interface
2992 if ((oi
== NULL
) || (OSPF_IS_AREA_ID_BACKBONE(ospfh
->area_id
)
2993 && !OSPF_IS_AREA_ID_BACKBONE(oi
->area
->area_id
))) {
2994 if ((oi
= ospf_associate_packet_vl(ospf
, ifp
, iph
, ospfh
))
2996 if (!ospf
->instance
&& IS_DEBUG_OSPF_EVENT
)
2998 "Packet from [%s] received on link %s"
2999 " but no ospf_interface",
3000 inet_ntoa(iph
->ip_src
), ifp
->name
);
3005 /* else it must be a local ospf interface, check it was received on
3008 else if (oi
->ifp
!= ifp
) {
3009 if (IS_DEBUG_OSPF_EVENT
)
3010 zlog_warn("Packet from [%s] received on wrong link %s",
3011 inet_ntoa(iph
->ip_src
), ifp
->name
);
3013 } else if (oi
->state
== ISM_Down
) {
3014 char buf
[2][INET_ADDRSTRLEN
];
3016 "Ignoring packet from %s to %s received on interface that is "
3017 "down [%s]; interface flags are %s",
3018 inet_ntop(AF_INET
, &iph
->ip_src
, buf
[0],
3020 inet_ntop(AF_INET
, &iph
->ip_dst
, buf
[1],
3022 ifp
->name
, if_flag_dump(ifp
->flags
));
3023 /* Fix multicast memberships? */
3024 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLSPFROUTERS
))
3025 OI_MEMBER_JOINED(oi
, MEMBER_ALLROUTERS
);
3026 else if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
))
3027 OI_MEMBER_JOINED(oi
, MEMBER_DROUTERS
);
3028 if (oi
->multicast_memberships
)
3029 ospf_if_set_multicast(oi
);
3034 * If the received packet is destined for AllDRouters, the packet
3035 * should be accepted only if the received ospf interface state is
3036 * either DR or Backup -- endo.
3038 if (iph
->ip_dst
.s_addr
== htonl(OSPF_ALLDROUTERS
)
3039 && (oi
->state
!= ISM_DR
&& oi
->state
!= ISM_Backup
)) {
3041 "Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)",
3042 inet_ntoa(iph
->ip_src
), IF_NAME(oi
),
3043 lookup_msg(ospf_ism_state_msg
, oi
->state
, NULL
));
3044 /* Try to fix multicast membership. */
3045 SET_FLAG(oi
->multicast_memberships
, MEMBER_DROUTERS
);
3046 ospf_if_set_multicast(oi
);
3050 /* Verify more OSPF header fields. */
3051 ret
= ospf_verify_header(ibuf
, oi
, iph
, ospfh
);
3053 if (IS_DEBUG_OSPF_PACKET(0, RECV
))
3055 "ospf_read[%s]: Header check failed, "
3057 inet_ntoa(iph
->ip_src
));
3061 /* Show debug receiving packet. */
3062 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, RECV
)) {
3063 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
)) {
3065 "-----------------------------------------------------");
3066 ospf_packet_dump(ibuf
);
3069 zlog_debug("%s received from [%s] via [%s]",
3070 lookup_msg(ospf_packet_type_str
, ospfh
->type
, NULL
),
3071 inet_ntoa(ospfh
->router_id
), IF_NAME(oi
));
3072 zlog_debug(" src [%s],", inet_ntoa(iph
->ip_src
));
3073 zlog_debug(" dst [%s]", inet_ntoa(iph
->ip_dst
));
3075 if (IS_DEBUG_OSPF_PACKET(ospfh
->type
- 1, DETAIL
))
3077 "-----------------------------------------------------");
3080 stream_forward_getp(ibuf
, OSPF_HEADER_SIZE
);
3082 /* Adjust size to message length. */
3083 length
= ntohs(ospfh
->length
) - OSPF_HEADER_SIZE
;
3085 /* Read rest of the packet and call each sort of packet routine. */
3086 switch (ospfh
->type
) {
3087 case OSPF_MSG_HELLO
:
3088 ospf_hello(iph
, ospfh
, ibuf
, oi
, length
);
3090 case OSPF_MSG_DB_DESC
:
3091 ospf_db_desc(iph
, ospfh
, ibuf
, oi
, length
);
3093 case OSPF_MSG_LS_REQ
:
3094 ospf_ls_req(iph
, ospfh
, ibuf
, oi
, length
);
3096 case OSPF_MSG_LS_UPD
:
3097 ospf_ls_upd(ospf
, iph
, ospfh
, ibuf
, oi
, length
);
3099 case OSPF_MSG_LS_ACK
:
3100 ospf_ls_ack(iph
, ospfh
, ibuf
, oi
, length
);
3103 zlog_warn("interface %s: OSPF packet header type %d is illegal",
3104 IF_NAME(oi
), ospfh
->type
);
3111 /* Make OSPF header. */
3112 static void ospf_make_header(int type
, struct ospf_interface
*oi
,
3115 struct ospf_header
*ospfh
;
3117 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3119 ospfh
->version
= (u_char
)OSPF_VERSION
;
3120 ospfh
->type
= (u_char
)type
;
3122 ospfh
->router_id
= oi
->ospf
->router_id
;
3124 ospfh
->checksum
= 0;
3125 ospfh
->area_id
= oi
->area
->area_id
;
3126 ospfh
->auth_type
= htons(ospf_auth_type(oi
));
3128 memset(ospfh
->u
.auth_data
, 0, OSPF_AUTH_SIMPLE_SIZE
);
3130 stream_forward_endp(s
, OSPF_HEADER_SIZE
);
3133 /* Make Authentication Data. */
3134 static int ospf_make_auth(struct ospf_interface
*oi
, struct ospf_header
*ospfh
)
3136 struct crypt_key
*ck
;
3138 switch (ospf_auth_type(oi
)) {
3139 case OSPF_AUTH_NULL
:
3140 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3143 case OSPF_AUTH_SIMPLE
:
3144 memcpy(ospfh
->u
.auth_data
, OSPF_IF_PARAM(oi
, auth_simple
),
3145 OSPF_AUTH_SIMPLE_SIZE
);
3147 case OSPF_AUTH_CRYPTOGRAPHIC
:
3148 /* If key is not set, then set 0. */
3149 if (list_isempty(OSPF_IF_PARAM(oi
, auth_crypt
))) {
3150 ospfh
->u
.crypt
.zero
= 0;
3151 ospfh
->u
.crypt
.key_id
= 0;
3152 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3155 listtail(OSPF_IF_PARAM(oi
, auth_crypt
)));
3156 ospfh
->u
.crypt
.zero
= 0;
3157 ospfh
->u
.crypt
.key_id
= ck
->key_id
;
3158 ospfh
->u
.crypt
.auth_data_len
= OSPF_AUTH_MD5_SIZE
;
3160 /* note: the seq is done in ospf_make_md5_digest() */
3163 /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data));
3171 /* Fill rest of OSPF header. */
3172 static void ospf_fill_header(struct ospf_interface
*oi
, struct stream
*s
,
3175 struct ospf_header
*ospfh
;
3177 ospfh
= (struct ospf_header
*)STREAM_DATA(s
);
3180 ospfh
->length
= htons(length
);
3182 /* Calculate checksum. */
3183 if (ntohs(ospfh
->auth_type
) != OSPF_AUTH_CRYPTOGRAPHIC
)
3184 ospfh
->checksum
= in_cksum(ospfh
, length
);
3186 ospfh
->checksum
= 0;
3188 /* Add Authentication Data. */
3189 ospf_make_auth(oi
, ospfh
);
3192 static int ospf_make_hello(struct ospf_interface
*oi
, struct stream
*s
)
3194 struct ospf_neighbor
*nbr
;
3195 struct route_node
*rn
;
3196 u_int16_t length
= OSPF_HELLO_MIN_SIZE
;
3197 struct in_addr mask
;
3201 /* Set netmask of interface. */
3202 if (!(CHECK_FLAG(oi
->connected
->flags
, ZEBRA_IFA_UNNUMBERED
)
3203 && oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3204 && oi
->type
!= OSPF_IFTYPE_VIRTUALLINK
)
3205 masklen2ip(oi
->address
->prefixlen
, &mask
);
3207 memset((char *)&mask
, 0, sizeof(struct in_addr
));
3208 stream_put_ipv4(s
, mask
.s_addr
);
3210 /* Set Hello Interval. */
3211 if (OSPF_IF_PARAM(oi
, fast_hello
) == 0)
3212 stream_putw(s
, OSPF_IF_PARAM(oi
, v_hello
));
3214 stream_putw(s
, 0); /* hello-interval of 0 for fast-hellos */
3216 if (IS_DEBUG_OSPF_EVENT
)
3217 zlog_debug("make_hello: options: %x, int: %s", OPTIONS(oi
),
3221 stream_putc(s
, OPTIONS(oi
));
3223 /* Set Router Priority. */
3224 stream_putc(s
, PRIORITY(oi
));
3226 /* Set Router Dead Interval. */
3227 stream_putl(s
, OSPF_IF_PARAM(oi
, v_wait
));
3229 /* Set Designated Router. */
3230 stream_put_ipv4(s
, DR(oi
).s_addr
);
3232 p
= stream_get_endp(s
);
3234 /* Set Backup Designated Router. */
3235 stream_put_ipv4(s
, BDR(oi
).s_addr
);
3237 /* Add neighbor seen. */
3238 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
3239 if ((nbr
= rn
->info
))
3240 if (nbr
->router_id
.s_addr
3241 != 0) /* Ignore 0.0.0.0 node. */
3243 != NSM_Attempt
) /* Ignore Down neighbor. */
3245 != NSM_Down
) /* This is myself for
3247 if (!IPV4_ADDR_SAME(
3249 &oi
->ospf
->router_id
)) {
3250 /* Check neighbor is
3252 if (nbr
->d_router
.s_addr
3273 /* Let neighbor generate BackupSeen. */
3275 stream_putl_at(s
, p
, 0); /* ipv4 address, normally */
3280 static int ospf_make_db_desc(struct ospf_interface
*oi
,
3281 struct ospf_neighbor
*nbr
, struct stream
*s
)
3283 struct ospf_lsa
*lsa
;
3284 u_int16_t length
= OSPF_DB_DESC_MIN_SIZE
;
3288 struct ospf_lsdb
*lsdb
;
3290 /* Set Interface MTU. */
3291 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
3294 stream_putw(s
, oi
->ifp
->mtu
);
3297 options
= OPTIONS(oi
);
3298 if (CHECK_FLAG(oi
->ospf
->config
, OSPF_OPAQUE_CAPABLE
))
3299 SET_FLAG(options
, OSPF_OPTION_O
);
3300 stream_putc(s
, options
);
3303 pp
= stream_get_endp(s
);
3304 stream_putc(s
, nbr
->dd_flags
);
3306 /* Set DD Sequence Number. */
3307 stream_putl(s
, nbr
->dd_seqnum
);
3309 /* shortcut unneeded walk of (empty) summary LSDBs */
3310 if (ospf_db_summary_isempty(nbr
))
3313 /* Describe LSA Header from Database Summary List. */
3314 lsdb
= &nbr
->db_sum
;
3316 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3317 struct route_table
*table
= lsdb
->type
[i
].db
;
3318 struct route_node
*rn
;
3320 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3321 if ((lsa
= rn
->info
) != NULL
) {
3322 if (IS_OPAQUE_LSA(lsa
->data
->type
)
3323 && (!CHECK_FLAG(options
, OSPF_OPTION_O
))) {
3324 /* Suppress advertising
3325 * opaque-informations. */
3326 /* Remove LSA from DB summary list. */
3327 ospf_lsdb_delete(lsdb
, lsa
);
3331 if (!CHECK_FLAG(lsa
->flags
, OSPF_LSA_DISCARD
)) {
3332 struct lsa_header
*lsah
;
3335 /* DD packet overflows interface MTU. */
3336 if (length
+ OSPF_LSA_HEADER_SIZE
3337 > ospf_packet_max(oi
))
3340 /* Keep pointer to LS age. */
3341 lsah
= (struct lsa_header
3346 /* Proceed stream pointer. */
3347 stream_put(s
, lsa
->data
,
3348 OSPF_LSA_HEADER_SIZE
);
3349 length
+= OSPF_LSA_HEADER_SIZE
;
3352 ls_age
= LS_AGE(lsa
);
3353 lsah
->ls_age
= htons(ls_age
);
3356 /* Remove LSA from DB summary list. */
3357 ospf_lsdb_delete(lsdb
, lsa
);
3361 /* Update 'More' bit */
3362 if (ospf_db_summary_isempty(nbr
)) {
3364 if (nbr
->state
>= NSM_Exchange
) {
3365 UNSET_FLAG(nbr
->dd_flags
, OSPF_DD_FLAG_M
);
3366 /* Rewrite DD flags */
3367 stream_putc_at(s
, pp
, nbr
->dd_flags
);
3369 assert(IS_SET_DD_M(nbr
->dd_flags
));
3375 static int ospf_make_ls_req_func(struct stream
*s
, u_int16_t
*length
,
3376 unsigned long delta
, struct ospf_neighbor
*nbr
,
3377 struct ospf_lsa
*lsa
)
3379 struct ospf_interface
*oi
;
3383 /* LS Request packet overflows interface MTU. */
3384 if (*length
+ delta
> ospf_packet_max(oi
))
3387 stream_putl(s
, lsa
->data
->type
);
3388 stream_put_ipv4(s
, lsa
->data
->id
.s_addr
);
3389 stream_put_ipv4(s
, lsa
->data
->adv_router
.s_addr
);
3391 ospf_lsa_unlock(&nbr
->ls_req_last
);
3392 nbr
->ls_req_last
= ospf_lsa_lock(lsa
);
3398 static int ospf_make_ls_req(struct ospf_neighbor
*nbr
, struct stream
*s
)
3400 struct ospf_lsa
*lsa
;
3401 u_int16_t length
= OSPF_LS_REQ_MIN_SIZE
;
3402 unsigned long delta
= stream_get_endp(s
) + 12;
3403 struct route_table
*table
;
3404 struct route_node
*rn
;
3406 struct ospf_lsdb
*lsdb
;
3408 lsdb
= &nbr
->ls_req
;
3410 for (i
= OSPF_MIN_LSA
; i
< OSPF_MAX_LSA
; i
++) {
3411 table
= lsdb
->type
[i
].db
;
3412 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
3413 if ((lsa
= (rn
->info
)) != NULL
)
3414 if (ospf_make_ls_req_func(s
, &length
, delta
,
3417 route_unlock_node(rn
);
3424 static int ls_age_increment(struct ospf_lsa
*lsa
, int delay
)
3428 age
= IS_LSA_MAXAGE(lsa
) ? OSPF_LSA_MAXAGE
: LS_AGE(lsa
) + delay
;
3430 return (age
> OSPF_LSA_MAXAGE
? OSPF_LSA_MAXAGE
: age
);
3433 static int ospf_make_ls_upd(struct ospf_interface
*oi
, struct list
*update
,
3436 struct ospf_lsa
*lsa
;
3437 struct listnode
*node
;
3438 u_int16_t length
= 0;
3439 unsigned int size_noauth
;
3440 unsigned long delta
= stream_get_endp(s
);
3444 if (IS_DEBUG_OSPF_EVENT
)
3445 zlog_debug("ospf_make_ls_upd: Start");
3447 pp
= stream_get_endp(s
);
3448 stream_forward_endp(s
, OSPF_LS_UPD_MIN_SIZE
);
3449 length
+= OSPF_LS_UPD_MIN_SIZE
;
3451 /* Calculate amount of packet usable for data. */
3452 size_noauth
= stream_get_size(s
) - ospf_packet_authspace(oi
);
3454 while ((node
= listhead(update
)) != NULL
) {
3455 struct lsa_header
*lsah
;
3458 if (IS_DEBUG_OSPF_EVENT
)
3459 zlog_debug("ospf_make_ls_upd: List Iteration %d",
3462 lsa
= listgetdata(node
);
3467 if (length
+ delta
+ ntohs(lsa
->data
->length
) > size_noauth
)
3470 /* Keep pointer to LS age. */
3471 lsah
= (struct lsa_header
*)(STREAM_DATA(s
)
3472 + stream_get_endp(s
));
3474 /* Put LSA to Link State Request. */
3475 stream_put(s
, lsa
->data
, ntohs(lsa
->data
->length
));
3478 /* each hop must increment an lsa_age by transmit_delay
3479 of OSPF interface */
3480 ls_age
= ls_age_increment(lsa
,
3481 OSPF_IF_PARAM(oi
, transmit_delay
));
3482 lsah
->ls_age
= htons(ls_age
);
3484 length
+= ntohs(lsa
->data
->length
);
3487 list_delete_node(update
, node
);
3488 ospf_lsa_unlock(&lsa
); /* oi->ls_upd_queue */
3491 /* Now set #LSAs. */
3492 stream_putl_at(s
, pp
, count
);
3494 if (IS_DEBUG_OSPF_EVENT
)
3495 zlog_debug("ospf_make_ls_upd: Stop");
3499 static int ospf_make_ls_ack(struct ospf_interface
*oi
, struct list
*ack
,
3502 struct listnode
*node
, *nnode
;
3503 u_int16_t length
= OSPF_LS_ACK_MIN_SIZE
;
3504 unsigned long delta
= stream_get_endp(s
) + 24;
3505 struct ospf_lsa
*lsa
;
3507 for (ALL_LIST_ELEMENTS(ack
, node
, nnode
, lsa
)) {
3510 if (length
+ delta
> ospf_packet_max(oi
))
3513 stream_put(s
, lsa
->data
, OSPF_LSA_HEADER_SIZE
);
3514 length
+= OSPF_LSA_HEADER_SIZE
;
3516 listnode_delete(ack
, lsa
);
3517 ospf_lsa_unlock(&lsa
); /* oi->ls_ack_direct.ls_ack */
3523 static void ospf_hello_send_sub(struct ospf_interface
*oi
, in_addr_t addr
)
3525 struct ospf_packet
*op
;
3526 u_int16_t length
= OSPF_HEADER_SIZE
;
3528 op
= ospf_packet_new(oi
->ifp
->mtu
);
3530 /* Prepare OSPF common header. */
3531 ospf_make_header(OSPF_MSG_HELLO
, oi
, op
->s
);
3533 /* Prepare OSPF Hello body. */
3534 length
+= ospf_make_hello(oi
, op
->s
);
3536 /* Fill OSPF header. */
3537 ospf_fill_header(oi
, op
->s
, length
);
3539 /* Set packet length. */
3540 op
->length
= length
;
3542 op
->dst
.s_addr
= addr
;
3544 if (IS_DEBUG_OSPF_EVENT
) {
3545 if (oi
->ospf
->vrf_id
)
3546 zlog_debug("%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 u_int16_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 u_int16_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 u_int16_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 op
= ospf_ls_upd_packet_new(update
, oi
);
3902 /* Prepare OSPF common header. */
3903 ospf_make_header(OSPF_MSG_LS_UPD
, oi
, op
->s
);
3905 /* Prepare OSPF Link State Update body.
3906 * Includes Type-7 translation.
3908 length
+= ospf_make_ls_upd(oi
, update
, op
->s
);
3910 /* Fill OSPF header. */
3911 ospf_fill_header(oi
, op
->s
, length
);
3913 /* Set packet length. */
3914 op
->length
= length
;
3916 /* Decide destination address. */
3917 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
3918 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
3920 op
->dst
.s_addr
= addr
.s_addr
;
3922 /* Add packet to the interface output queue. */
3923 ospf_packet_add(oi
, op
);
3924 /* Call ospf_write() right away to send ospf packets to neighbors */
3925 if (send_lsupd_now
) {
3926 struct thread os_packet_thd
;
3928 os_packet_thd
.arg
= (void *)oi
->ospf
;
3929 if (oi
->on_write_q
== 0) {
3930 listnode_add(oi
->ospf
->oi_write_q
, oi
);
3933 ospf_write(&os_packet_thd
);
3935 /* Hook thread to write packet. */
3936 OSPF_ISM_WRITE_ON(oi
->ospf
);
3940 static int ospf_ls_upd_send_queue_event(struct thread
*thread
)
3942 struct ospf_interface
*oi
= THREAD_ARG(thread
);
3943 struct route_node
*rn
;
3944 struct route_node
*rnext
;
3945 struct list
*update
;
3948 oi
->t_ls_upd_event
= NULL
;
3950 if (IS_DEBUG_OSPF_EVENT
)
3951 zlog_debug("ospf_ls_upd_send_queue start");
3953 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
3954 rnext
= route_next(rn
);
3956 if (rn
->info
== NULL
)
3959 update
= (struct list
*)rn
->info
;
3961 ospf_ls_upd_queue_send(oi
, update
, rn
->p
.u
.prefix4
, 0);
3963 /* list might not be empty. */
3964 if (listcount(update
) == 0) {
3965 list_delete_and_null((struct list
**)&rn
->info
);
3966 route_unlock_node(rn
);
3972 if (IS_DEBUG_OSPF_EVENT
)
3974 "ospf_ls_upd_send_queue: update lists not cleared,"
3975 " %d nodes to try again, raising new event",
3977 oi
->t_ls_upd_event
= NULL
;
3978 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
3979 &oi
->t_ls_upd_event
);
3982 if (IS_DEBUG_OSPF_EVENT
)
3983 zlog_debug("ospf_ls_upd_send_queue stop");
3988 void ospf_ls_upd_send(struct ospf_neighbor
*nbr
, struct list
*update
, int flag
,
3991 struct ospf_interface
*oi
;
3992 struct ospf_lsa
*lsa
;
3993 struct prefix_ipv4 p
;
3994 struct route_node
*rn
;
3995 struct listnode
*node
;
4000 p
.prefixlen
= IPV4_MAX_BITLEN
;
4002 /* Decide destination address. */
4003 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4004 p
.prefix
= oi
->vl_data
->peer_addr
;
4005 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4006 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4007 else if (flag
== OSPF_SEND_PACKET_DIRECT
)
4008 p
.prefix
= nbr
->address
.u
.prefix4
;
4009 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4010 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4011 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4012 p
.prefix
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4014 p
.prefix
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4016 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4017 if (flag
== OSPF_SEND_PACKET_INDIRECT
)
4019 "* LS-Update is directly sent on NBMA network.");
4020 if (IPV4_ADDR_SAME(&oi
->address
->u
.prefix4
, &p
.prefix
))
4021 zlog_warn("* LS-Update is sent to myself.");
4024 rn
= route_node_get(oi
->ls_upd_queue
, (struct prefix
*)&p
);
4026 if (rn
->info
== NULL
)
4027 rn
->info
= list_new();
4029 route_unlock_node(rn
);
4031 for (ALL_LIST_ELEMENTS_RO(update
, node
, lsa
))
4032 listnode_add(rn
->info
,
4033 ospf_lsa_lock(lsa
)); /* oi->ls_upd_queue */
4034 if (send_lsupd_now
) {
4035 struct list
*send_update_list
;
4036 struct route_node
*rn
, *rnext
;
4038 for (rn
= route_top(oi
->ls_upd_queue
); rn
; rn
= rnext
) {
4039 rnext
= route_next(rn
);
4041 if (rn
->info
== NULL
)
4044 send_update_list
= (struct list
*)rn
->info
;
4046 ospf_ls_upd_queue_send(oi
, send_update_list
,
4047 rn
->p
.u
.prefix4
, 1);
4051 thread_add_event(master
, ospf_ls_upd_send_queue_event
, oi
, 0,
4052 &oi
->t_ls_upd_event
);
4055 static void ospf_ls_ack_send_list(struct ospf_interface
*oi
, struct list
*ack
,
4058 struct ospf_packet
*op
;
4059 u_int16_t length
= OSPF_HEADER_SIZE
;
4061 op
= ospf_packet_new(oi
->ifp
->mtu
);
4063 /* Prepare OSPF common header. */
4064 ospf_make_header(OSPF_MSG_LS_ACK
, oi
, op
->s
);
4066 /* Prepare OSPF Link State Acknowledgment body. */
4067 length
+= ospf_make_ls_ack(oi
, ack
, op
->s
);
4069 /* Fill OSPF header. */
4070 ospf_fill_header(oi
, op
->s
, length
);
4072 /* Set packet length. */
4073 op
->length
= length
;
4075 /* Decide destination address. */
4076 if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4077 op
->dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4079 op
->dst
.s_addr
= dst
.s_addr
;
4081 /* Add packet to the interface output queue. */
4082 ospf_packet_add(oi
, op
);
4084 /* Hook thread to write packet. */
4085 OSPF_ISM_WRITE_ON(oi
->ospf
);
4088 static int ospf_ls_ack_send_event(struct thread
*thread
)
4090 struct ospf_interface
*oi
= THREAD_ARG(thread
);
4092 oi
->t_ls_ack_direct
= NULL
;
4094 while (listcount(oi
->ls_ack_direct
.ls_ack
))
4095 ospf_ls_ack_send_list(oi
, oi
->ls_ack_direct
.ls_ack
,
4096 oi
->ls_ack_direct
.dst
);
4101 void ospf_ls_ack_send(struct ospf_neighbor
*nbr
, struct ospf_lsa
*lsa
)
4103 struct ospf_interface
*oi
= nbr
->oi
;
4105 if (listcount(oi
->ls_ack_direct
.ls_ack
) == 0)
4106 oi
->ls_ack_direct
.dst
= nbr
->address
.u
.prefix4
;
4108 listnode_add(oi
->ls_ack_direct
.ls_ack
, ospf_lsa_lock(lsa
));
4110 thread_add_event(master
, ospf_ls_ack_send_event
, oi
, 0,
4111 &oi
->t_ls_ack_direct
);
4114 /* Send Link State Acknowledgment delayed. */
4115 void ospf_ls_ack_send_delayed(struct ospf_interface
*oi
)
4119 /* Decide destination address. */
4120 /* RFC2328 Section 13.5 On non-broadcast
4121 networks, delayed Link State Acknowledgment packets must be
4122 unicast separately over each adjacency (i.e., neighbor whose
4123 state is >= Exchange). */
4124 if (oi
->type
== OSPF_IFTYPE_NBMA
) {
4125 struct ospf_neighbor
*nbr
;
4126 struct route_node
*rn
;
4128 for (rn
= route_top(oi
->nbrs
); rn
; rn
= route_next(rn
))
4129 if ((nbr
= rn
->info
) != NULL
)
4130 if (nbr
!= oi
->nbr_self
4131 && nbr
->state
>= NSM_Exchange
)
4132 while (listcount(oi
->ls_ack
))
4133 ospf_ls_ack_send_list(
4135 nbr
->address
.u
.prefix4
);
4138 if (oi
->type
== OSPF_IFTYPE_VIRTUALLINK
)
4139 dst
.s_addr
= oi
->vl_data
->peer_addr
.s_addr
;
4140 else if (oi
->state
== ISM_DR
|| oi
->state
== ISM_Backup
)
4141 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4142 else if (oi
->type
== OSPF_IFTYPE_POINTOPOINT
)
4143 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4144 else if (oi
->type
== OSPF_IFTYPE_POINTOMULTIPOINT
)
4145 dst
.s_addr
= htonl(OSPF_ALLSPFROUTERS
);
4147 dst
.s_addr
= htonl(OSPF_ALLDROUTERS
);
4149 while (listcount(oi
->ls_ack
))
4150 ospf_ls_ack_send_list(oi
, oi
->ls_ack
, dst
);
4154 * On pt-to-pt links, all OSPF control packets are sent to the multicast
4155 * address. As a result, the kernel does not need to learn the interface
4156 * MAC of the OSPF neighbor. However, in our world, this will delay
4157 * convergence. Take the case when due to a link flap, all routes now
4158 * want to use an interface which was deemed to be costlier prior to this
4159 * event. For routes that will be installed, the missing MAC will have
4160 * punt-to-CPU set on them. This may overload the CPU control path that
4161 * can be avoided if the MAC was known apriori.
4163 #define OSPF_PING_NBR_STR_MAX (BUFSIZ)
4164 void ospf_proactively_arp(struct ospf_neighbor
*nbr
)
4166 char ping_nbr
[OSPF_PING_NBR_STR_MAX
];
4169 if (!nbr
|| !nbr
->oi
|| !nbr
->oi
->ifp
)
4172 snprintf(ping_nbr
, sizeof(ping_nbr
),
4173 "ping -c 1 -I %s %s > /dev/null 2>&1 &",
4174 nbr
->oi
->ifp
->name
, inet_ntoa(nbr
->address
.u
.prefix4
));
4176 ret
= system(ping_nbr
);
4177 if (IS_DEBUG_OSPF_EVENT
)
4178 zlog_debug("Executed %s %s", ping_nbr
,
4179 ((ret
== 0) ? "successfully" : "but failed"));