2 * EIGRP Sending and Receiving EIGRP Update Packets.
3 * Copyright (C) 2013-2016
15 * This file is part of GNU Zebra.
17 * GNU Zebra is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the
19 * Free Software Foundation; either version 2, or (at your option) any
22 * GNU Zebra is distributed in the hope that it will be useful, but
23 * WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * You should have received a copy of the GNU General Public License along
28 * with this program; see the file COPYING; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
40 #include "sockunion.h"
48 #include "plist_int.h"
52 #include "eigrpd/eigrp_types.h"
53 #include "eigrpd/eigrp_structs.h"
54 #include "eigrpd/eigrpd.h"
55 #include "eigrpd/eigrp_interface.h"
56 #include "eigrpd/eigrp_neighbor.h"
57 #include "eigrpd/eigrp_packet.h"
58 #include "eigrpd/eigrp_zebra.h"
59 #include "eigrpd/eigrp_vty.h"
60 #include "eigrpd/eigrp_dump.h"
61 #include "eigrpd/eigrp_macros.h"
62 #include "eigrpd/eigrp_topology.h"
63 #include "eigrpd/eigrp_fsm.h"
64 #include "eigrpd/eigrp_network.h"
65 #include "eigrpd/eigrp_metric.h"
67 bool eigrp_update_prefix_apply(struct eigrp
*eigrp
, struct eigrp_interface
*ei
,
68 int in
, struct prefix
*prefix
)
70 struct access_list
*alist
;
71 struct prefix_list
*plist
;
73 alist
= eigrp
->list
[in
];
74 if (alist
&& access_list_apply(alist
, prefix
) == FILTER_DENY
)
77 plist
= eigrp
->prefix
[in
];
78 if (plist
&& prefix_list_apply(plist
, prefix
) == PREFIX_DENY
)
82 if (alist
&& access_list_apply(alist
, prefix
) == FILTER_DENY
)
85 plist
= ei
->prefix
[in
];
86 if (plist
&& prefix_list_apply(plist
, prefix
) == PREFIX_DENY
)
93 * @fn remove_received_prefix_gr
95 * @param[in] nbr_prefixes List of neighbor prefixes
96 * @param[in] recv_prefix Prefix which needs to be removed from
102 * Function is used for removing received prefix
103 * from list of neighbor prefixes
106 remove_received_prefix_gr(struct list
*nbr_prefixes
,
107 struct eigrp_prefix_descriptor
*recv_prefix
)
109 struct listnode
*node1
, *node11
;
110 struct eigrp_prefix_descriptor
*prefix
= NULL
;
112 /* iterate over all prefixes in list */
113 for (ALL_LIST_ELEMENTS(nbr_prefixes
, node1
, node11
, prefix
)) {
114 /* remove prefix from list if found */
115 if (prefix
== recv_prefix
) {
116 listnode_delete(nbr_prefixes
, prefix
);
122 * @fn eigrp_update_receive_GR_ask
124 * @param[in] eigrp EIGRP process
125 * @param[in] nbr Neighbor update of who we
127 * @param[in] nbr_prefixes Prefixes which weren't advertised
132 * Function is used for notifying FSM about prefixes which
133 * weren't advertised by neighbor:
134 * We will send message to FSM with prefix delay set to infinity.
136 static void eigrp_update_receive_GR_ask(struct eigrp
*eigrp
,
137 struct eigrp_neighbor
*nbr
,
138 struct list
*nbr_prefixes
)
140 struct listnode
*node1
;
141 struct eigrp_prefix_descriptor
*prefix
;
142 struct eigrp_fsm_action_message fsm_msg
;
144 /* iterate over all prefixes which weren't advertised by neighbor */
145 for (ALL_LIST_ELEMENTS_RO(nbr_prefixes
, node1
, prefix
)) {
146 zlog_debug("GR receive: Neighbor not advertised %pFX",
147 prefix
->destination
);
149 fsm_msg
.metrics
= prefix
->reported_metric
;
150 /* set delay to MAX */
151 fsm_msg
.metrics
.delay
= EIGRP_MAX_METRIC
;
153 struct eigrp_route_descriptor
*entry
=
154 eigrp_route_descriptor_lookup(prefix
->entries
, nbr
);
156 fsm_msg
.packet_type
= EIGRP_OPC_UPDATE
;
157 fsm_msg
.eigrp
= eigrp
;
158 fsm_msg
.data_type
= EIGRP_INT
;
159 fsm_msg
.adv_router
= nbr
;
160 fsm_msg
.entry
= entry
;
161 fsm_msg
.prefix
= prefix
;
163 /* send message to FSM */
164 eigrp_fsm_event(&fsm_msg
);
169 * EIGRP UPDATE read function
171 void eigrp_update_receive(struct eigrp
*eigrp
, struct ip
*iph
,
172 struct eigrp_header
*eigrph
, struct stream
*s
,
173 struct eigrp_interface
*ei
, int size
)
175 struct eigrp_neighbor
*nbr
;
176 struct TLV_IPv4_Internal_type
*tlv
;
177 struct eigrp_prefix_descriptor
*pe
;
178 struct eigrp_route_descriptor
*ne
;
183 struct prefix dest_addr
;
184 uint8_t graceful_restart
;
185 uint8_t graceful_restart_final
;
186 struct list
*nbr_prefixes
= NULL
;
188 /* increment statistics. */
191 /* get neighbor struct */
192 nbr
= eigrp_nbr_get(ei
, eigrph
, iph
);
194 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
197 flags
= ntohl(eigrph
->flags
);
199 if (flags
& EIGRP_CR_FLAG
) {
204 graceful_restart
= 0;
205 graceful_restart_final
= 0;
206 if ((nbr
->recv_sequence_number
) == (ntohl(eigrph
->sequence
)))
209 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
210 if (IS_DEBUG_EIGRP_PACKET(0, RECV
))
212 "Processing Update size[%u] int(%s) nbr(%pI4) seq [%u] flags [%0x]",
214 ifindex2ifname(nbr
->ei
->ifp
->ifindex
, eigrp
->vrf_id
),
215 &nbr
->src
, nbr
->recv_sequence_number
, flags
);
218 if ((flags
== (EIGRP_INIT_FLAG
+ EIGRP_RS_FLAG
+ EIGRP_EOT_FLAG
))
220 /* Graceful restart Update received with all routes */
222 zlog_info("Neighbor %pI4 (%s) is resync: peer graceful-restart",
224 ifindex2ifname(nbr
->ei
->ifp
->ifindex
, eigrp
->vrf_id
));
226 /* get all prefixes from neighbor from topology table */
227 nbr_prefixes
= eigrp_neighbor_prefixes_lookup(eigrp
, nbr
);
228 graceful_restart
= 1;
229 graceful_restart_final
= 1;
230 } else if ((flags
== (EIGRP_INIT_FLAG
+ EIGRP_RS_FLAG
)) && (!same
)) {
231 /* Graceful restart Update received, routes also in next packet
234 zlog_info("Neighbor %pI4 (%s) is resync: peer graceful-restart",
236 ifindex2ifname(nbr
->ei
->ifp
->ifindex
, eigrp
->vrf_id
));
238 /* get all prefixes from neighbor from topology table */
239 nbr_prefixes
= eigrp_neighbor_prefixes_lookup(eigrp
, nbr
);
240 /* save prefixes to neighbor for later use */
241 nbr
->nbr_gr_prefixes
= nbr_prefixes
;
242 graceful_restart
= 1;
243 graceful_restart_final
= 0;
244 } else if ((flags
== (EIGRP_EOT_FLAG
)) && (!same
)) {
245 /* If there was INIT+RS Update packet before,
246 * consider this as GR EOT */
248 if (nbr
->nbr_gr_prefixes
!= NULL
) {
249 /* this is final packet of GR */
250 nbr_prefixes
= nbr
->nbr_gr_prefixes
;
251 nbr
->nbr_gr_prefixes
= NULL
;
253 graceful_restart
= 1;
254 graceful_restart_final
= 1;
257 } else if ((flags
== (0)) && (!same
)) {
258 /* If there was INIT+RS Update packet before,
259 * consider this as GR not final packet */
261 if (nbr
->nbr_gr_prefixes
!= NULL
) {
262 /* this is GR not final route packet */
263 nbr_prefixes
= nbr
->nbr_gr_prefixes
;
265 graceful_restart
= 1;
266 graceful_restart_final
= 0;
269 } else if ((flags
& EIGRP_INIT_FLAG
)
270 && (!same
)) { /* When in pending state, send INIT update only
272 already sent before (only if init_sequence
274 if ((nbr
->state
== EIGRP_NEIGHBOR_PENDING
)
275 && (nbr
->init_sequence_number
== 0))
276 eigrp_update_send_init(nbr
);
278 if (nbr
->state
== EIGRP_NEIGHBOR_UP
) {
279 eigrp_nbr_state_set(nbr
, EIGRP_NEIGHBOR_DOWN
);
280 eigrp_topology_neighbor_down(nbr
->ei
->eigrp
, nbr
);
281 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
282 zlog_info("Neighbor %pI4 (%s) is down: peer restarted",
284 ifindex2ifname(nbr
->ei
->ifp
->ifindex
,
286 eigrp_nbr_state_set(nbr
, EIGRP_NEIGHBOR_PENDING
);
288 "Neighbor %pI4 (%s) is pending: new adjacency",
290 ifindex2ifname(nbr
->ei
->ifp
->ifindex
,
292 eigrp_update_send_init(nbr
);
296 /*If there is topology information*/
297 while (s
->endp
> s
->getp
) {
298 type
= stream_getw(s
);
300 case EIGRP_TLV_IPv4_INT
:
301 stream_set_getp(s
, s
->getp
- sizeof(uint16_t));
303 tlv
= eigrp_read_ipv4_tlv(s
);
305 /*searching if destination exists */
306 dest_addr
.family
= AF_INET
;
307 dest_addr
.u
.prefix4
= tlv
->destination
;
308 dest_addr
.prefixlen
= tlv
->prefix_length
;
309 struct eigrp_prefix_descriptor
*dest
=
310 eigrp_topology_table_lookup_ipv4(
311 eigrp
->topology_table
, &dest_addr
);
313 /*if exists it comes to DUAL*/
315 /* remove received prefix from neighbor prefix
317 if (graceful_restart
)
318 remove_received_prefix_gr(nbr_prefixes
,
321 struct eigrp_fsm_action_message msg
;
322 struct eigrp_route_descriptor
*entry
=
323 eigrp_route_descriptor_lookup(
326 msg
.packet_type
= EIGRP_OPC_UPDATE
;
328 msg
.data_type
= EIGRP_INT
;
329 msg
.adv_router
= nbr
;
330 msg
.metrics
= tlv
->metric
;
333 eigrp_fsm_event(&msg
);
335 /*Here comes topology information save*/
336 pe
= eigrp_prefix_descriptor_new();
337 pe
->serno
= eigrp
->serno
;
339 (struct prefix
*)prefix_ipv4_new();
340 prefix_copy(pe
->destination
, &dest_addr
);
342 pe
->state
= EIGRP_FSM_STATE_PASSIVE
;
343 pe
->nt
= EIGRP_TOPOLOGY_TYPE_REMOTE
;
345 ne
= eigrp_route_descriptor_new();
347 ne
->adv_router
= nbr
;
348 ne
->reported_metric
= tlv
->metric
;
349 ne
->reported_distance
= eigrp_calculate_metrics(
354 if (eigrp_update_prefix_apply(eigrp
, ei
,
357 ne
->reported_metric
.delay
=
360 ne
->distance
= eigrp_calculate_total_metrics(
363 pe
->fdistance
= pe
->distance
= pe
->rdistance
=
367 EIGRP_ROUTE_DESCRIPTOR_SUCCESSOR_FLAG
;
369 eigrp_prefix_descriptor_add(
370 eigrp
->topology_table
, pe
);
371 eigrp_route_descriptor_add(eigrp
, pe
, ne
);
372 pe
->distance
= pe
->fdistance
= pe
->rdistance
=
374 pe
->reported_metric
= ne
->total_metric
;
375 eigrp_topology_update_node_flags(eigrp
, pe
);
377 pe
->req_action
|= EIGRP_FSM_NEED_UPDATE
;
379 eigrp
->topology_changes_internalIPV4
,
382 eigrp_IPv4_InternalTLV_free(tlv
);
385 case EIGRP_TLV_IPv4_EXT
:
386 /* DVS: processing of external routes needs packet and fsm work.
387 * for now, lets just not creash the box
390 length
= stream_getw(s
);
391 // -2 for type, -2 for len
392 for (length
-= 4; length
; length
--) {
393 (void)stream_getc(s
);
398 /* ask about prefixes not present in GR update,
399 * if this is final GR packet */
400 if (graceful_restart_final
) {
401 eigrp_update_receive_GR_ask(eigrp
, nbr
, nbr_prefixes
);
405 * We don't need to send separate Ack for INIT Update. INIT will be
406 * acked in EOT Update.
408 if ((nbr
->state
== EIGRP_NEIGHBOR_UP
) && !(flags
== EIGRP_INIT_FLAG
)) {
409 eigrp_hello_send_ack(nbr
);
412 eigrp_query_send_all(eigrp
);
413 eigrp_update_send_all(eigrp
, ei
);
416 list_delete(&nbr_prefixes
);
419 /*send EIGRP Update packet*/
420 void eigrp_update_send_init(struct eigrp_neighbor
*nbr
)
422 struct eigrp_packet
*ep
;
423 uint16_t length
= EIGRP_HEADER_LEN
;
425 ep
= eigrp_packet_new(EIGRP_PACKET_MTU(nbr
->ei
->ifp
->mtu
), nbr
);
427 /* Prepare EIGRP INIT UPDATE header */
428 if (IS_DEBUG_EIGRP_PACKET(0, RECV
))
429 zlog_debug("Enqueuing Update Init Seq [%u] Ack [%u]",
430 nbr
->ei
->eigrp
->sequence_number
,
431 nbr
->recv_sequence_number
);
433 eigrp_packet_header_init(
434 EIGRP_OPC_UPDATE
, nbr
->ei
->eigrp
, ep
->s
, EIGRP_INIT_FLAG
,
435 nbr
->ei
->eigrp
->sequence_number
, nbr
->recv_sequence_number
);
437 // encode Authentication TLV, if needed
438 if ((nbr
->ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
439 && (nbr
->ei
->params
.auth_keychain
!= NULL
)) {
440 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, nbr
->ei
);
441 eigrp_make_md5_digest(nbr
->ei
, ep
->s
,
442 EIGRP_AUTH_UPDATE_INIT_FLAG
);
446 eigrp_packet_checksum(nbr
->ei
, ep
->s
, length
);
449 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
451 /*This ack number we await from neighbor*/
452 nbr
->init_sequence_number
= nbr
->ei
->eigrp
->sequence_number
;
453 ep
->sequence_number
= nbr
->ei
->eigrp
->sequence_number
;
454 if (IS_DEBUG_EIGRP_PACKET(0, RECV
))
456 "Enqueuing Update Init Len [%u] Seq [%u] Dest [%pI4]",
457 ep
->length
, ep
->sequence_number
, &ep
->dst
);
459 /*Put packet to retransmission queue*/
460 eigrp_fifo_push(nbr
->retrans_queue
, ep
);
462 if (nbr
->retrans_queue
->count
== 1) {
463 eigrp_send_packet_reliably(nbr
);
467 static void eigrp_update_place_on_nbr_queue(struct eigrp_neighbor
*nbr
,
468 struct eigrp_packet
*ep
,
469 uint32_t seq_no
, int length
)
471 if ((nbr
->ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
472 && (nbr
->ei
->params
.auth_keychain
!= NULL
)) {
473 eigrp_make_md5_digest(nbr
->ei
, ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
477 eigrp_packet_checksum(nbr
->ei
, ep
->s
, length
);
480 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
482 /*This ack number we await from neighbor*/
483 ep
->sequence_number
= seq_no
;
485 if (IS_DEBUG_EIGRP_PACKET(0, RECV
))
487 "Enqueuing Update Init Len [%u] Seq [%u] Dest [%pI4]",
488 ep
->length
, ep
->sequence_number
, &ep
->dst
);
490 /*Put packet to retransmission queue*/
491 eigrp_fifo_push(nbr
->retrans_queue
, ep
);
493 if (nbr
->retrans_queue
->count
== 1)
494 eigrp_send_packet_reliably(nbr
);
497 static void eigrp_update_send_to_all_nbrs(struct eigrp_interface
*ei
,
498 struct eigrp_packet
*ep
)
500 struct listnode
*node
, *nnode
;
501 struct eigrp_neighbor
*nbr
;
502 bool packet_sent
= false;
504 for (ALL_LIST_ELEMENTS(ei
->nbrs
, node
, nnode
, nbr
)) {
505 struct eigrp_packet
*ep_dup
;
507 if (nbr
->state
!= EIGRP_NEIGHBOR_UP
)
511 ep_dup
= eigrp_packet_duplicate(ep
, NULL
);
517 /*Put packet to retransmission queue*/
518 eigrp_fifo_push(nbr
->retrans_queue
, ep_dup
);
520 if (nbr
->retrans_queue
->count
== 1) {
521 eigrp_send_packet_reliably(nbr
);
526 eigrp_packet_free(ep
);
529 void eigrp_update_send_EOT(struct eigrp_neighbor
*nbr
)
531 struct eigrp_packet
*ep
;
532 uint16_t length
= EIGRP_HEADER_LEN
;
533 struct eigrp_route_descriptor
*te
;
534 struct eigrp_prefix_descriptor
*pe
;
535 struct listnode
*node2
, *nnode2
;
536 struct eigrp_interface
*ei
= nbr
->ei
;
537 struct eigrp
*eigrp
= ei
->eigrp
;
538 struct prefix
*dest_addr
;
539 uint32_t seq_no
= eigrp
->sequence_number
;
540 uint16_t eigrp_mtu
= EIGRP_PACKET_MTU(ei
->ifp
->mtu
);
541 struct route_node
*rn
;
543 ep
= eigrp_packet_new(eigrp_mtu
, nbr
);
545 /* Prepare EIGRP EOT UPDATE header */
546 eigrp_packet_header_init(EIGRP_OPC_UPDATE
, eigrp
, ep
->s
, EIGRP_EOT_FLAG
,
547 seq_no
, nbr
->recv_sequence_number
);
549 // encode Authentication TLV, if needed
550 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
551 && (ei
->params
.auth_keychain
!= NULL
)) {
552 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, ei
);
555 for (rn
= route_top(eigrp
->topology_table
); rn
; rn
= route_next(rn
)) {
560 for (ALL_LIST_ELEMENTS(pe
->entries
, node2
, nnode2
, te
)) {
561 if (eigrp_nbr_split_horizon_check(te
, ei
))
564 if ((length
+ EIGRP_TLV_MAX_IPV4_BYTE
) > eigrp_mtu
) {
565 eigrp_update_place_on_nbr_queue(nbr
, ep
, seq_no
,
569 length
= EIGRP_HEADER_LEN
;
570 ep
= eigrp_packet_new(eigrp_mtu
, nbr
);
571 eigrp_packet_header_init(
572 EIGRP_OPC_UPDATE
, nbr
->ei
->eigrp
, ep
->s
,
573 EIGRP_EOT_FLAG
, seq_no
,
574 nbr
->recv_sequence_number
);
576 if ((ei
->params
.auth_type
577 == EIGRP_AUTH_TYPE_MD5
)
578 && (ei
->params
.auth_keychain
!= NULL
)) {
580 eigrp_add_authTLV_MD5_to_stream(
584 /* Get destination address from prefix */
585 dest_addr
= pe
->destination
;
587 /* Check if any list fits */
588 if (eigrp_update_prefix_apply(
589 eigrp
, ei
, EIGRP_FILTER_OUT
, dest_addr
))
592 length
+= eigrp_add_internalTLV_to_stream(ep
->s
,
598 eigrp_update_place_on_nbr_queue(nbr
, ep
, seq_no
, length
);
599 eigrp
->sequence_number
= seq_no
++;
602 void eigrp_update_send(struct eigrp_interface
*ei
)
604 struct eigrp_packet
*ep
;
605 struct listnode
*node
, *nnode
;
606 struct eigrp_prefix_descriptor
*pe
;
608 struct eigrp
*eigrp
= ei
->eigrp
;
609 struct prefix
*dest_addr
;
610 uint32_t seq_no
= eigrp
->sequence_number
;
611 uint16_t eigrp_mtu
= EIGRP_PACKET_MTU(ei
->ifp
->mtu
);
613 if (ei
->nbrs
->count
== 0)
616 uint16_t length
= EIGRP_HEADER_LEN
;
618 ep
= eigrp_packet_new(eigrp_mtu
, NULL
);
620 /* Prepare EIGRP INIT UPDATE header */
621 eigrp_packet_header_init(EIGRP_OPC_UPDATE
, eigrp
, ep
->s
, 0, seq_no
, 0);
623 // encode Authentication TLV, if needed
624 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
625 && (ei
->params
.auth_keychain
!= NULL
)) {
626 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, ei
);
630 for (ALL_LIST_ELEMENTS(ei
->eigrp
->topology_changes_internalIPV4
, node
,
632 struct eigrp_route_descriptor
*ne
;
634 if (!(pe
->req_action
& EIGRP_FSM_NEED_UPDATE
))
637 ne
= listnode_head(pe
->entries
);
638 if (eigrp_nbr_split_horizon_check(ne
, ei
))
641 if ((length
+ EIGRP_TLV_MAX_IPV4_BYTE
) > eigrp_mtu
) {
642 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
643 && (ei
->params
.auth_keychain
!= NULL
)) {
644 eigrp_make_md5_digest(ei
, ep
->s
,
645 EIGRP_AUTH_UPDATE_FLAG
);
648 eigrp_packet_checksum(ei
, ep
->s
, length
);
651 ep
->dst
.s_addr
= htonl(EIGRP_MULTICAST_ADDRESS
);
653 ep
->sequence_number
= seq_no
;
655 eigrp_update_send_to_all_nbrs(ei
, ep
);
657 length
= EIGRP_HEADER_LEN
;
658 ep
= eigrp_packet_new(eigrp_mtu
, NULL
);
659 eigrp_packet_header_init(EIGRP_OPC_UPDATE
, eigrp
, ep
->s
,
661 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
662 && (ei
->params
.auth_keychain
!= NULL
)) {
663 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
,
668 /* Get destination address from prefix */
669 dest_addr
= pe
->destination
;
671 if (eigrp_update_prefix_apply(eigrp
, ei
, EIGRP_FILTER_OUT
,
673 // pe->reported_metric.delay = EIGRP_MAX_METRIC;
676 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe
);
682 eigrp_packet_free(ep
);
686 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
687 && (ei
->params
.auth_keychain
!= NULL
)) {
688 eigrp_make_md5_digest(ei
, ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
692 eigrp_packet_checksum(ei
, ep
->s
, length
);
695 ep
->dst
.s_addr
= htonl(EIGRP_MULTICAST_ADDRESS
);
697 /*This ack number we await from neighbor*/
698 ep
->sequence_number
= eigrp
->sequence_number
;
700 if (IS_DEBUG_EIGRP_PACKET(0, RECV
))
701 zlog_debug("Enqueuing Update length[%u] Seq [%u]", length
,
702 ep
->sequence_number
);
704 eigrp_update_send_to_all_nbrs(ei
, ep
);
705 ei
->eigrp
->sequence_number
= seq_no
++;
708 void eigrp_update_send_all(struct eigrp
*eigrp
,
709 struct eigrp_interface
*exception
)
711 struct eigrp_interface
*iface
;
712 struct listnode
*node
, *node2
, *nnode2
;
713 struct eigrp_prefix_descriptor
*pe
;
715 for (ALL_LIST_ELEMENTS_RO(eigrp
->eiflist
, node
, iface
)) {
716 if (iface
!= exception
) {
717 eigrp_update_send(iface
);
721 for (ALL_LIST_ELEMENTS(eigrp
->topology_changes_internalIPV4
, node2
,
723 if (pe
->req_action
& EIGRP_FSM_NEED_UPDATE
) {
724 pe
->req_action
&= ~EIGRP_FSM_NEED_UPDATE
;
725 listnode_delete(eigrp
->topology_changes_internalIPV4
,
732 * @fn eigrp_update_send_GR_part
734 * @param[in] nbr contains neighbor who would receive
741 * Function used for sending Graceful restart Update packet
742 * and if there are multiple chunks, send only one of them.
743 * It is called from thread. Do not call it directly.
745 * Uses nbr_gr_packet_type from neighbor.
747 static void eigrp_update_send_GR_part(struct eigrp_neighbor
*nbr
)
749 struct eigrp_packet
*ep
;
750 uint16_t length
= EIGRP_HEADER_LEN
;
751 struct eigrp_prefix_descriptor
*pe
;
752 struct prefix
*dest_addr
;
753 struct eigrp_interface
*ei
= nbr
->ei
;
754 struct eigrp
*eigrp
= ei
->eigrp
;
755 struct list
*prefixes
;
757 unsigned int send_prefixes
;
758 struct route_node
*rn
;
760 /* get prefixes to send to neighbor */
761 prefixes
= nbr
->nbr_gr_prefixes_send
;
765 /* if there already were last packet chunk, we won't continue */
766 if (nbr
->nbr_gr_packet_type
== EIGRP_PACKET_PART_LAST
)
769 /* if this is first packet chunk, we need to decide,
770 * if there will be one or more chunks */
771 if (nbr
->nbr_gr_packet_type
== EIGRP_PACKET_PART_FIRST
) {
772 if (prefixes
->count
<= EIGRP_TLV_MAX_IPv4
) {
773 /* there will be only one chunk */
774 flags
= EIGRP_INIT_FLAG
+ EIGRP_RS_FLAG
776 nbr
->nbr_gr_packet_type
= EIGRP_PACKET_PART_LAST
;
778 /* there will be more chunks */
779 flags
= EIGRP_INIT_FLAG
+ EIGRP_RS_FLAG
;
780 nbr
->nbr_gr_packet_type
= EIGRP_PACKET_PART_NA
;
783 /* this is not first chunk, and we need to decide,
784 * if there will be more chunks */
785 if (prefixes
->count
<= EIGRP_TLV_MAX_IPv4
) {
786 /* this is last chunk */
787 flags
= EIGRP_EOT_FLAG
;
788 nbr
->nbr_gr_packet_type
= EIGRP_PACKET_PART_LAST
;
790 /* there will be more chunks */
792 nbr
->nbr_gr_packet_type
= EIGRP_PACKET_PART_NA
;
796 ep
= eigrp_packet_new(EIGRP_PACKET_MTU(ei
->ifp
->mtu
), nbr
);
798 /* Prepare EIGRP Graceful restart UPDATE header */
799 eigrp_packet_header_init(EIGRP_OPC_UPDATE
, eigrp
, ep
->s
, flags
,
800 eigrp
->sequence_number
,
801 nbr
->recv_sequence_number
);
803 // encode Authentication TLV, if needed
804 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
805 && (ei
->params
.auth_keychain
!= NULL
)) {
806 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, ei
);
809 for (rn
= route_top(eigrp
->topology_table
); rn
; rn
= route_next(rn
)) {
817 dest_addr
= pe
->destination
;
819 if (eigrp_update_prefix_apply(eigrp
, ei
, EIGRP_FILTER_OUT
,
821 /* do not send filtered route */
822 zlog_info("Filtered prefix %pI4 won't be sent out.",
823 &dest_addr
->u
.prefix4
);
825 /* sending route which wasn't filtered */
826 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe
);
831 * This makes no sense, Filter out then filter in???
832 * Look into this more - DBS
834 if (eigrp_update_prefix_apply(eigrp
, ei
, EIGRP_FILTER_IN
,
836 /* do not send filtered route */
837 zlog_info("Filtered prefix %pI4 will be removed.",
838 &dest_addr
->u
.prefix4
);
840 /* prepare message for FSM */
841 struct eigrp_fsm_action_message fsm_msg
;
843 struct eigrp_route_descriptor
*entry
=
844 eigrp_route_descriptor_lookup(pe
->entries
, nbr
);
846 fsm_msg
.packet_type
= EIGRP_OPC_UPDATE
;
847 fsm_msg
.eigrp
= eigrp
;
848 fsm_msg
.data_type
= EIGRP_INT
;
849 fsm_msg
.adv_router
= nbr
;
850 fsm_msg
.metrics
= pe
->reported_metric
;
851 /* Set delay to MAX */
852 fsm_msg
.metrics
.delay
= EIGRP_MAX_METRIC
;
853 fsm_msg
.entry
= entry
;
856 /* send message to FSM */
857 eigrp_fsm_event(&fsm_msg
);
860 /* NULL the pointer */
863 /* delete processed prefix from list */
864 listnode_delete(prefixes
, pe
);
866 /* if there are enough prefixes, send packet */
867 if (send_prefixes
>= EIGRP_TLV_MAX_IPv4
)
871 /* compute Auth digest */
872 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
873 && (ei
->params
.auth_keychain
!= NULL
)) {
874 eigrp_make_md5_digest(ei
, ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
878 eigrp_packet_checksum(ei
, ep
->s
, length
);
881 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
883 /*This ack number we await from neighbor*/
884 ep
->sequence_number
= eigrp
->sequence_number
;
886 if (IS_DEBUG_EIGRP_PACKET(0, RECV
))
888 "Enqueuing Update Init Len [%u] Seq [%u] Dest [%pI4]",
889 ep
->length
, ep
->sequence_number
, &ep
->dst
);
891 /*Put packet to retransmission queue*/
892 eigrp_fifo_push(nbr
->retrans_queue
, ep
);
894 if (nbr
->retrans_queue
->count
== 1) {
895 eigrp_send_packet_reliably(nbr
);
900 * @fn eigrp_update_send_GR_thread
902 * @param[in] thread contains neighbor who would receive
905 * @return int always 0
908 * Function used for sending Graceful restart Update packet
909 * in thread, it is prepared for multiple chunks of packet.
911 * Uses nbr_gr_packet_type and t_nbr_send_gr from neighbor.
913 int eigrp_update_send_GR_thread(struct thread
*thread
)
915 struct eigrp_neighbor
*nbr
;
917 /* get argument from thread */
918 nbr
= THREAD_ARG(thread
);
919 /* remove this thread pointer */
921 /* if there is packet waiting in queue,
922 * schedule this thread again with small delay */
923 if (nbr
->retrans_queue
->count
> 0) {
924 thread_add_timer_msec(master
, eigrp_update_send_GR_thread
, nbr
,
925 10, &nbr
->t_nbr_send_gr
);
929 /* send GR EIGRP packet chunk */
930 eigrp_update_send_GR_part(nbr
);
932 /* if it wasn't last chunk, schedule this thread again */
933 if (nbr
->nbr_gr_packet_type
!= EIGRP_PACKET_PART_LAST
) {
934 thread_execute(master
, eigrp_update_send_GR_thread
, nbr
, 0);
941 * @fn eigrp_update_send_GR
943 * @param[in] nbr Neighbor who would receive
946 * @param[in] gr_type Who executed Graceful restart
947 * @param[in] vty Virtual terminal for log output
952 * Function used for sending Graceful restart Update packet:
953 * Creates Update packet with INIT, RS, EOT flags and include
954 * all route except those filtered
956 void eigrp_update_send_GR(struct eigrp_neighbor
*nbr
, enum GR_type gr_type
,
959 struct eigrp_prefix_descriptor
*pe2
;
960 struct list
*prefixes
;
961 struct route_node
*rn
;
962 struct eigrp_interface
*ei
= nbr
->ei
;
963 struct eigrp
*eigrp
= ei
->eigrp
;
965 if (gr_type
== EIGRP_GR_FILTER
) {
966 /* function was called after applying filtration */
968 "Neighbor %pI4 (%s) is resync: route configuration changed",
970 ifindex2ifname(ei
->ifp
->ifindex
, eigrp
->vrf_id
));
971 } else if (gr_type
== EIGRP_GR_MANUAL
) {
972 /* Graceful restart was called manually */
973 zlog_info("Neighbor %pI4 (%s) is resync: manually cleared",
975 ifindex2ifname(ei
->ifp
->ifindex
, eigrp
->vrf_id
));
978 vty_time_print(vty
, 0);
980 "Neighbor %pI4 (%s) is resync: manually cleared\n",
982 ifindex2ifname(ei
->ifp
->ifindex
,
987 prefixes
= list_new();
988 /* add all prefixes from topology table to list */
989 for (rn
= route_top(eigrp
->topology_table
); rn
; rn
= route_next(rn
)) {
994 listnode_add(prefixes
, pe2
);
997 /* save prefixes to neighbor */
998 nbr
->nbr_gr_prefixes_send
= prefixes
;
999 /* indicate, that this is first GR Update packet chunk */
1000 nbr
->nbr_gr_packet_type
= EIGRP_PACKET_PART_FIRST
;
1001 /* execute packet sending in thread */
1002 thread_execute(master
, eigrp_update_send_GR_thread
, nbr
, 0);
1006 * @fn eigrp_update_send_interface_GR
1008 * @param[in] ei Interface to neighbors of which
1012 * @param[in] gr_type Who executed Graceful restart
1013 * @param[in] vty Virtual terminal for log output
1018 * Function used for sending Graceful restart Update packet
1019 * to all neighbors on specified interface.
1021 void eigrp_update_send_interface_GR(struct eigrp_interface
*ei
,
1022 enum GR_type gr_type
, struct vty
*vty
)
1024 struct listnode
*node
;
1025 struct eigrp_neighbor
*nbr
;
1027 /* iterate over all neighbors on eigrp interface */
1028 for (ALL_LIST_ELEMENTS_RO(ei
->nbrs
, node
, nbr
)) {
1029 /* send GR to neighbor */
1030 eigrp_update_send_GR(nbr
, gr_type
, vty
);
1035 * @fn eigrp_update_send_process_GR
1037 * @param[in] eigrp EIGRP process
1038 * @param[in] gr_type Who executed Graceful restart
1039 * @param[in] vty Virtual terminal for log output
1044 * Function used for sending Graceful restart Update packet
1045 * to all neighbors in eigrp process.
1047 void eigrp_update_send_process_GR(struct eigrp
*eigrp
, enum GR_type gr_type
,
1050 struct listnode
*node
;
1051 struct eigrp_interface
*ei
;
1053 /* iterate over all eigrp interfaces */
1054 for (ALL_LIST_ELEMENTS_RO(eigrp
->eiflist
, node
, ei
)) {
1055 /* send GR to all neighbors on interface */
1056 eigrp_update_send_interface_GR(ei
, gr_type
, vty
);