1 /* Zebra next hop tracking code
2 * Copyright (C) 2013 Cumulus Networks, Inc.
4 * This file is part of GNU Zebra.
6 * GNU Zebra is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2, or (at your option) any
11 * GNU Zebra is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "sockunion.h"
32 #include "workqueue.h"
39 #include "zebra/rib.h"
41 #include "zebra/zserv.h"
42 #include "zebra/zebra_ns.h"
43 #include "zebra/zebra_vrf.h"
44 #include "zebra/redistribute.h"
45 #include "zebra/debug.h"
46 #include "zebra/zebra_rnh.h"
47 #include "zebra/zebra_routemap.h"
48 #include "zebra/interface.h"
49 #include "zebra/zebra_memory.h"
51 static void free_state(vrf_id_t vrf_id
, struct route_entry
*re
,
52 struct route_node
*rn
);
53 static void copy_state(struct rnh
*rnh
, struct route_entry
*re
,
54 struct route_node
*rn
);
55 #define lookup_rnh_table(v, f) \
57 struct zebra_vrf *zvrf; \
58 struct route_table *t = NULL; \
59 zvrf = zebra_vrf_lookup_by_id(v); \
61 t = zvrf->rnh_table[family2afi(f)]; \
65 static int compare_state(struct route_entry
*r1
, struct route_entry
*r2
);
66 static int send_client(struct rnh
*rnh
, struct zserv
*client
, rnh_type_t type
,
68 static void print_rnh(struct route_node
*rn
, struct vty
*vty
);
70 int zebra_rnh_ip_default_route
= 0;
71 int zebra_rnh_ipv6_default_route
= 0;
73 static inline struct route_table
*get_rnh_table(vrf_id_t vrfid
, int family
,
76 struct zebra_vrf
*zvrf
;
77 struct route_table
*t
= NULL
;
79 zvrf
= zebra_vrf_lookup_by_id(vrfid
);
82 case RNH_NEXTHOP_TYPE
:
83 t
= zvrf
->rnh_table
[family2afi(family
)];
85 case RNH_IMPORT_CHECK_TYPE
:
86 t
= zvrf
->import_check_table
[family2afi(family
)];
93 char *rnh_str(struct rnh
*rnh
, char *buf
, int size
)
95 prefix2str(&(rnh
->node
->p
), buf
, size
);
99 struct rnh
*zebra_add_rnh(struct prefix
*p
, vrf_id_t vrfid
, rnh_type_t type
)
101 struct route_table
*table
;
102 struct route_node
*rn
;
103 struct rnh
*rnh
= NULL
;
104 char buf
[PREFIX2STR_BUFFER
];
106 if (IS_ZEBRA_DEBUG_NHT
) {
107 prefix2str(p
, buf
, sizeof(buf
));
108 zlog_debug("%u: Add RNH %s type %d", vrfid
, buf
, type
);
110 table
= get_rnh_table(vrfid
, PREFIX_FAMILY(p
), type
);
112 prefix2str(p
, buf
, sizeof(buf
));
113 zlog_warn("%u: Add RNH %s type %d - table not found", vrfid
,
118 /* Make it sure prefixlen is applied to the prefix. */
121 /* Lookup (or add) route node.*/
122 rn
= route_node_get(table
, p
);
125 rnh
= XCALLOC(MTYPE_RNH
, sizeof(struct rnh
));
126 rnh
->client_list
= list_new();
128 rnh
->zebra_static_route_list
= list_new();
129 rnh
->zebra_pseudowire_list
= list_new();
135 route_unlock_node(rn
);
139 struct rnh
*zebra_lookup_rnh(struct prefix
*p
, vrf_id_t vrfid
, rnh_type_t type
)
141 struct route_table
*table
;
142 struct route_node
*rn
;
144 table
= get_rnh_table(vrfid
, PREFIX_FAMILY(p
), type
);
148 /* Make it sure prefixlen is applied to the prefix. */
151 /* Lookup route node.*/
152 rn
= route_node_lookup(table
, p
);
156 route_unlock_node(rn
);
160 void zebra_free_rnh(struct rnh
*rnh
)
162 rnh
->flags
|= ZEBRA_NHT_DELETED
;
163 list_delete_and_null(&rnh
->client_list
);
164 list_delete_and_null(&rnh
->zebra_static_route_list
);
165 list_delete_and_null(&rnh
->zebra_pseudowire_list
);
166 free_state(rnh
->vrf_id
, rnh
->state
, rnh
->node
);
167 XFREE(MTYPE_RNH
, rnh
);
170 void zebra_delete_rnh(struct rnh
*rnh
, rnh_type_t type
)
172 struct route_node
*rn
;
174 if (!rnh
|| (rnh
->flags
& ZEBRA_NHT_DELETED
) || !(rn
= rnh
->node
))
177 if (IS_ZEBRA_DEBUG_NHT
) {
178 char buf
[PREFIX2STR_BUFFER
];
179 zlog_debug("%u: Del RNH %s type %d", rnh
->vrf_id
,
180 rnh_str(rnh
, buf
, sizeof(buf
)), type
);
185 route_unlock_node(rn
);
188 void zebra_add_rnh_client(struct rnh
*rnh
, struct zserv
*client
,
189 rnh_type_t type
, vrf_id_t vrf_id
)
191 if (IS_ZEBRA_DEBUG_NHT
) {
192 char buf
[PREFIX2STR_BUFFER
];
193 zlog_debug("%u: Client %s registers for RNH %s type %d", vrf_id
,
194 zebra_route_string(client
->proto
),
195 rnh_str(rnh
, buf
, sizeof(buf
)), type
);
197 if (!listnode_lookup(rnh
->client_list
, client
)) {
198 listnode_add(rnh
->client_list
, client
);
199 send_client(rnh
, client
, type
,
200 vrf_id
); // Pending: check if its needed
204 void zebra_remove_rnh_client(struct rnh
*rnh
, struct zserv
*client
,
207 if (IS_ZEBRA_DEBUG_NHT
) {
208 char buf
[PREFIX2STR_BUFFER
];
209 zlog_debug("Client %s unregisters for RNH %s type %d",
210 zebra_route_string(client
->proto
),
211 rnh_str(rnh
, buf
, sizeof(buf
)), type
);
213 listnode_delete(rnh
->client_list
, client
);
214 if (list_isempty(rnh
->client_list
)
215 && list_isempty(rnh
->zebra_static_route_list
)
216 && list_isempty(rnh
->zebra_pseudowire_list
))
217 zebra_delete_rnh(rnh
, type
);
220 void zebra_register_rnh_static_nh(vrf_id_t vrf_id
, struct prefix
*nh
,
221 struct route_node
*static_rn
)
225 rnh
= zebra_add_rnh(nh
, vrf_id
, RNH_NEXTHOP_TYPE
);
226 if (rnh
&& !listnode_lookup(rnh
->zebra_static_route_list
, static_rn
)) {
227 listnode_add(rnh
->zebra_static_route_list
, static_rn
);
231 void zebra_deregister_rnh_static_nh(vrf_id_t vrf_id
, struct prefix
*nh
,
232 struct route_node
*static_rn
)
236 rnh
= zebra_lookup_rnh(nh
, vrf_id
, RNH_NEXTHOP_TYPE
);
237 if (!rnh
|| (rnh
->flags
& ZEBRA_NHT_DELETED
))
240 listnode_delete(rnh
->zebra_static_route_list
, static_rn
);
242 if (list_isempty(rnh
->client_list
)
243 && list_isempty(rnh
->zebra_static_route_list
)
244 && list_isempty(rnh
->zebra_pseudowire_list
))
245 zebra_delete_rnh(rnh
, RNH_NEXTHOP_TYPE
);
248 void zebra_deregister_rnh_static_nexthops(vrf_id_t vrf_id
,
249 struct nexthop
*nexthop
,
250 struct route_node
*rn
)
255 for (nh
= nexthop
; nh
; nh
= nh
->next
) {
257 case NEXTHOP_TYPE_IPV4
:
258 case NEXTHOP_TYPE_IPV4_IFINDEX
:
259 nh_p
.family
= AF_INET
;
260 nh_p
.prefixlen
= IPV4_MAX_BITLEN
;
261 nh_p
.u
.prefix4
= nh
->gate
.ipv4
;
263 case NEXTHOP_TYPE_IPV6
:
264 case NEXTHOP_TYPE_IPV6_IFINDEX
:
265 nh_p
.family
= AF_INET6
;
266 nh_p
.prefixlen
= IPV6_MAX_BITLEN
;
267 nh_p
.u
.prefix6
= nh
->gate
.ipv6
;
270 * Not sure what really to do here, we are not
271 * supposed to have either of these for NHT
272 * and the code has no way to know what prefix
273 * to use. So I'm going to just continue
274 * for the moment, which is preferable to
275 * what is currently happening which is a
277 * Some simple testing shows that we
278 * are not leaving slag around for these
279 * skipped static routes. Since
280 * they don't appear to be installed
282 case NEXTHOP_TYPE_IFINDEX
:
283 case NEXTHOP_TYPE_BLACKHOLE
:
287 zebra_deregister_rnh_static_nh(vrf_id
, &nh_p
, rn
);
291 /* XXX move this utility function elsewhere? */
292 static void addr2hostprefix(int af
, const union g_addr
*addr
,
293 struct prefix
*prefix
)
297 prefix
->family
= AF_INET
;
298 prefix
->prefixlen
= IPV4_MAX_BITLEN
;
299 prefix
->u
.prefix4
= addr
->ipv4
;
302 prefix
->family
= AF_INET6
;
303 prefix
->prefixlen
= IPV6_MAX_BITLEN
;
304 prefix
->u
.prefix6
= addr
->ipv6
;
307 memset(prefix
, 0, sizeof(*prefix
));
308 zlog_warn("%s: unknown address family %d", __func__
, af
);
313 void zebra_register_rnh_pseudowire(vrf_id_t vrf_id
, struct zebra_pw
*pw
)
318 addr2hostprefix(pw
->af
, &pw
->nexthop
, &nh
);
319 rnh
= zebra_add_rnh(&nh
, vrf_id
, RNH_NEXTHOP_TYPE
);
320 if (rnh
&& !listnode_lookup(rnh
->zebra_pseudowire_list
, pw
)) {
321 listnode_add(rnh
->zebra_pseudowire_list
, pw
);
323 zebra_evaluate_rnh(vrf_id
, pw
->af
, 1, RNH_NEXTHOP_TYPE
, &nh
);
327 void zebra_deregister_rnh_pseudowire(vrf_id_t vrf_id
, struct zebra_pw
*pw
)
335 listnode_delete(rnh
->zebra_pseudowire_list
, pw
);
338 if (list_isempty(rnh
->client_list
)
339 && list_isempty(rnh
->zebra_static_route_list
)
340 && list_isempty(rnh
->zebra_pseudowire_list
))
341 zebra_delete_rnh(rnh
, RNH_NEXTHOP_TYPE
);
344 /* Apply the NHT route-map for a client to the route (and nexthops)
347 static int zebra_rnh_apply_nht_rmap(int family
, struct route_node
*prn
,
348 struct route_entry
*re
, int proto
)
350 int at_least_one
= 0;
351 int rmap_family
; /* Route map has diff AF family enum */
352 struct nexthop
*nexthop
;
355 rmap_family
= (family
== AF_INET
) ? AFI_IP
: AFI_IP6
;
358 for (nexthop
= re
->nexthop
; nexthop
; nexthop
= nexthop
->next
) {
359 ret
= zebra_nht_route_map_check(rmap_family
, proto
,
360 &prn
->p
, re
, nexthop
);
361 if (ret
!= RMAP_DENYMATCH
) {
362 SET_FLAG(nexthop
->flags
, NEXTHOP_FLAG_ACTIVE
);
363 at_least_one
++; /* at least one valid NH */
365 UNSET_FLAG(nexthop
->flags
, NEXTHOP_FLAG_ACTIVE
);
369 return (at_least_one
);
373 * Determine appropriate route (RE entry) resolving a tracked BGP route
374 * for BGP route for import.
377 struct route_entry
*zebra_rnh_resolve_import_entry(vrf_id_t vrfid
,
379 struct route_node
*nrn
,
381 struct route_node
**prn
)
383 struct route_table
*route_table
;
384 struct route_node
*rn
;
385 struct route_entry
*re
;
389 route_table
= zebra_vrf_table(family2afi(family
), SAFI_UNICAST
, vrfid
);
390 if (!route_table
) // unexpected
393 rn
= route_node_match(route_table
, &nrn
->p
);
397 /* Unlock route node - we don't need to lock when walking the tree. */
398 route_unlock_node(rn
);
400 if (CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_EXACT_MATCH
) &&
401 !prefix_same(&nrn
->p
, &rn
->p
))
404 /* Identify appropriate route entry. */
405 RNODE_FOREACH_RE(rn
, re
) {
406 if (!CHECK_FLAG(re
->status
, ROUTE_ENTRY_REMOVED
) &&
407 CHECK_FLAG(re
->flags
, ZEBRA_FLAG_SELECTED
) &&
408 (re
->type
!= ZEBRA_ROUTE_BGP
))
418 * See if a tracked route entry for import (by BGP) has undergone any
419 * change, and if so, notify the client.
421 static void zebra_rnh_eval_import_check_entry(vrf_id_t vrfid
, int family
,
422 int force
, struct route_node
*nrn
,
424 struct route_entry
*re
)
426 int state_changed
= 0;
427 struct zserv
*client
;
428 char bufn
[INET6_ADDRSTRLEN
];
429 struct listnode
*node
;
430 struct nexthop
*nexthop
;
432 if (re
&& (rnh
->state
== NULL
)) {
433 for (ALL_NEXTHOPS(re
->nexthop
, nexthop
))
434 if (CHECK_FLAG(nexthop
->flags
, NEXTHOP_FLAG_FIB
)) {
438 } else if (!re
&& (rnh
->state
!= NULL
))
441 if (compare_state(re
, rnh
->state
))
442 copy_state(rnh
, re
, nrn
);
444 if (state_changed
|| force
) {
445 if (IS_ZEBRA_DEBUG_NHT
) {
446 prefix2str(&nrn
->p
, bufn
, INET6_ADDRSTRLEN
);
447 zlog_debug("%u:%s: Route import check %s %s\n", vrfid
,
448 bufn
, rnh
->state
? "passed" : "failed",
449 state_changed
? "(state changed)" : "");
451 /* state changed, notify clients */
452 for (ALL_LIST_ELEMENTS_RO(rnh
->client_list
, node
, client
)) {
453 send_client(rnh
, client
, RNH_IMPORT_CHECK_TYPE
, vrfid
);
459 * Notify clients registered for this nexthop about a change.
461 static void zebra_rnh_notify_protocol_clients(vrf_id_t vrfid
, int family
,
462 struct route_node
*nrn
,
464 struct route_node
*prn
,
465 struct route_entry
*re
)
467 struct listnode
*node
;
468 struct zserv
*client
;
469 char bufn
[INET6_ADDRSTRLEN
];
470 char bufp
[INET6_ADDRSTRLEN
];
471 int num_resolving_nh
;
473 if (IS_ZEBRA_DEBUG_NHT
) {
474 prefix2str(&nrn
->p
, bufn
, INET6_ADDRSTRLEN
);
476 prefix2str(&prn
->p
, bufp
, INET6_ADDRSTRLEN
);
477 zlog_debug("%u:%s: NH resolved over route %s", vrfid
,
480 zlog_debug("%u:%s: NH has become unresolved", vrfid
,
484 for (ALL_LIST_ELEMENTS_RO(rnh
->client_list
, node
, client
)) {
486 /* Apply route-map for this client to route resolving
488 * nexthop to see if it is filtered or not.
490 num_resolving_nh
= zebra_rnh_apply_nht_rmap(
491 family
, prn
, re
, client
->proto
);
492 if (num_resolving_nh
)
493 rnh
->filtered
[client
->proto
] = 0;
495 rnh
->filtered
[client
->proto
] = 1;
497 if (IS_ZEBRA_DEBUG_NHT
)
499 "%u:%s: Notifying client %s about NH %s",
501 zebra_route_string(client
->proto
),
504 : "(filtered by route-map)");
506 rnh
->filtered
[client
->proto
] = 0;
507 if (IS_ZEBRA_DEBUG_NHT
)
509 "%u:%s: Notifying client %s about NH (unreachable)",
511 zebra_route_string(client
->proto
));
514 send_client(rnh
, client
, RNH_NEXTHOP_TYPE
, vrfid
);
518 static void zebra_rnh_process_static_routes(vrf_id_t vrfid
, int family
,
519 struct route_node
*nrn
,
521 struct route_node
*prn
,
522 struct route_entry
*re
)
524 struct listnode
*node
;
525 int num_resolving_nh
= 0;
526 struct route_node
*static_rn
;
527 struct route_entry
*sre
;
528 struct nexthop
*nexthop
;
529 char bufn
[INET6_ADDRSTRLEN
];
530 char bufp
[INET6_ADDRSTRLEN
];
531 char bufs
[INET6_ADDRSTRLEN
];
533 if (IS_ZEBRA_DEBUG_NHT
) {
534 prefix2str(&nrn
->p
, bufn
, INET6_ADDRSTRLEN
);
536 prefix2str(&prn
->p
, bufp
, INET6_ADDRSTRLEN
);
540 /* Apply route-map for "static" to route resolving this
541 * nexthop to see if it is filtered or not.
543 num_resolving_nh
= zebra_rnh_apply_nht_rmap(family
, prn
, re
,
545 if (num_resolving_nh
)
546 rnh
->filtered
[ZEBRA_ROUTE_STATIC
] = 0;
548 rnh
->filtered
[ZEBRA_ROUTE_STATIC
] = 1;
550 rnh
->filtered
[ZEBRA_ROUTE_STATIC
] = 0;
552 /* Evaluate each static route associated with this nexthop. */
553 for (ALL_LIST_ELEMENTS_RO(rnh
->zebra_static_route_list
, node
,
555 RNODE_FOREACH_RE (static_rn
, sre
) {
556 if (sre
->type
!= ZEBRA_ROUTE_STATIC
)
559 /* Set the filter flag for the correct nexthop - static
561 * be having multiple. We care here only about
562 * registered nexthops.
564 for (nexthop
= sre
->nexthop
; nexthop
;
565 nexthop
= nexthop
->next
) {
566 switch (nexthop
->type
) {
567 case NEXTHOP_TYPE_IPV4
:
568 case NEXTHOP_TYPE_IPV4_IFINDEX
:
569 if (nexthop
->gate
.ipv4
.s_addr
570 == nrn
->p
.u
.prefix4
.s_addr
) {
571 if (num_resolving_nh
)
574 NEXTHOP_FLAG_FILTERED
);
578 NEXTHOP_FLAG_FILTERED
);
581 case NEXTHOP_TYPE_IPV6
:
582 case NEXTHOP_TYPE_IPV6_IFINDEX
:
584 if (memcmp(&nexthop
->gate
.ipv6
,
585 &nrn
->p
.u
.prefix6
, 16)
587 if (num_resolving_nh
)
590 NEXTHOP_FLAG_FILTERED
);
594 NEXTHOP_FLAG_FILTERED
);
602 if (IS_ZEBRA_DEBUG_NHT
) {
603 prefix2str(&static_rn
->p
, bufs
,
607 "%u:%s: NH change %s, scheduling static route %s",
611 : "(filtered by route-map)",
615 "%u:%s: NH unreachable, scheduling static route %s",
619 SET_FLAG(sre
->status
, ROUTE_ENTRY_CHANGED
);
620 SET_FLAG(sre
->status
, ROUTE_ENTRY_NEXTHOPS_CHANGED
);
623 rib_queue_add(static_rn
);
628 * Determine appropriate route (route entry) resolving a tracked
631 static struct route_entry
*zebra_rnh_resolve_nexthop_entry(vrf_id_t vrfid
,
633 struct route_node
*nrn
,
635 struct route_node
**prn
)
637 struct route_table
*route_table
;
638 struct route_node
*rn
;
639 struct route_entry
*re
;
643 route_table
= zebra_vrf_table(family2afi(family
), SAFI_UNICAST
, vrfid
);
647 rn
= route_node_match(route_table
, &nrn
->p
);
651 /* Unlock route node - we don't need to lock when walking the tree. */
652 route_unlock_node(rn
);
654 /* While resolving nexthops, we may need to walk up the tree from the
655 * most-specific match. Do similar logic as in zebra_rib.c
658 /* Do not resolve over default route unless allowed &&
659 * match route to be exact if so specified
661 if (is_default_prefix(&rn
->p
) &&
662 !nh_resolve_via_default(rn
->p
.family
))
665 /* Identify appropriate route entry. */
666 RNODE_FOREACH_RE(rn
, re
) {
667 if (CHECK_FLAG(re
->status
, ROUTE_ENTRY_REMOVED
))
669 if (!CHECK_FLAG(re
->flags
, ZEBRA_FLAG_SELECTED
))
672 if (CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_CONNECTED
)) {
673 if ((re
->type
== ZEBRA_ROUTE_CONNECT
)
674 || (re
->type
== ZEBRA_ROUTE_STATIC
))
676 if (re
->type
== ZEBRA_ROUTE_NHRP
) {
677 struct nexthop
*nexthop
;
679 for (nexthop
= re
->nexthop
;
681 nexthop
= nexthop
->next
)
683 == NEXTHOP_TYPE_IFINDEX
)
692 /* Route entry found, we're done; else, walk up the tree. */
698 if (CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_CONNECTED
))
707 static void zebra_rnh_process_pseudowires(vrf_id_t vrfid
, struct rnh
*rnh
)
710 struct listnode
*node
;
712 for (ALL_LIST_ELEMENTS_RO(rnh
->zebra_pseudowire_list
, node
, pw
))
717 * See if a tracked nexthop entry has undergone any change, and if so,
718 * take appropriate action; this involves notifying any clients and/or
719 * scheduling dependent static routes for processing.
721 static void zebra_rnh_eval_nexthop_entry(vrf_id_t vrfid
, int family
, int force
,
722 struct route_node
*nrn
,
724 struct route_node
*prn
,
725 struct route_entry
*re
)
727 int state_changed
= 0;
729 /* If we're resolving over a different route, resolution has changed or
730 * the resolving route has some change (e.g., metric), there is a state
733 if (!prefix_same(&rnh
->resolved_route
, &prn
->p
)) {
735 prefix_copy(&rnh
->resolved_route
, &prn
->p
);
737 memset(&rnh
->resolved_route
, 0, sizeof(struct prefix
));
739 copy_state(rnh
, re
, nrn
);
741 } else if (compare_state(re
, rnh
->state
)) {
742 copy_state(rnh
, re
, nrn
);
746 if (state_changed
|| force
) {
747 /* NOTE: Use the "copy" of resolving route stored in 'rnh' i.e.,
750 /* Notify registered protocol clients. */
751 zebra_rnh_notify_protocol_clients(vrfid
, family
, nrn
, rnh
, prn
,
754 /* Process static routes attached to this nexthop */
755 zebra_rnh_process_static_routes(vrfid
, family
, nrn
, rnh
, prn
,
758 /* Process pseudowires attached to this nexthop */
759 zebra_rnh_process_pseudowires(vrfid
, rnh
);
763 /* Evaluate one tracked entry */
764 static void zebra_rnh_evaluate_entry(vrf_id_t vrfid
, int family
, int force
,
765 rnh_type_t type
, struct route_node
*nrn
)
768 struct route_entry
*re
;
769 struct route_node
*prn
;
770 char bufn
[INET6_ADDRSTRLEN
];
772 if (IS_ZEBRA_DEBUG_NHT
) {
773 prefix2str(&nrn
->p
, bufn
, INET6_ADDRSTRLEN
);
774 zlog_debug("%u:%s: Evaluate RNH, type %d %s", vrfid
, bufn
, type
,
775 force
? "(force)" : "");
780 /* Identify route entry (RE) resolving this tracked entry. */
781 if (type
== RNH_IMPORT_CHECK_TYPE
)
782 re
= zebra_rnh_resolve_import_entry(vrfid
, family
, nrn
,
785 re
= zebra_rnh_resolve_nexthop_entry(vrfid
, family
, nrn
, rnh
,
788 /* If the entry cannot be resolved and that is also the existing state,
789 * there is nothing further to do.
791 if (!re
&& rnh
->state
== NULL
&& !force
)
794 /* Process based on type of entry. */
795 if (type
== RNH_IMPORT_CHECK_TYPE
)
796 zebra_rnh_eval_import_check_entry(vrfid
, family
, force
, nrn
,
799 zebra_rnh_eval_nexthop_entry(vrfid
, family
, force
, nrn
, rnh
,
804 * Clear the ROUTE_ENTRY_NEXTHOPS_CHANGED flag
805 * from the re entries.
807 * Please note we are doing this *after* we have
808 * notified the world about each nexthop as that
809 * we can have a situation where one re entry
810 * covers multiple nexthops we are interested in.
812 static void zebra_rnh_clear_nhc_flag(vrf_id_t vrfid
, int family
,
813 rnh_type_t type
, struct route_node
*nrn
)
816 struct route_entry
*re
;
817 struct route_node
*prn
;
821 /* Identify route entry (RIB) resolving this tracked entry. */
822 if (type
== RNH_IMPORT_CHECK_TYPE
)
823 re
= zebra_rnh_resolve_import_entry(vrfid
, family
, nrn
,
826 re
= zebra_rnh_resolve_nexthop_entry(vrfid
, family
, nrn
, rnh
,
830 UNSET_FLAG(re
->status
, ROUTE_ENTRY_NEXTHOPS_CHANGED
);
831 UNSET_FLAG(re
->status
, ROUTE_ENTRY_LABELS_CHANGED
);
835 /* Evaluate all tracked entries (nexthops or routes for import into BGP)
836 * of a particular VRF and address-family or a specific prefix.
838 void zebra_evaluate_rnh(vrf_id_t vrfid
, int family
, int force
, rnh_type_t type
,
841 struct route_table
*rnh_table
;
842 struct route_node
*nrn
;
844 rnh_table
= get_rnh_table(vrfid
, family
, type
);
845 if (!rnh_table
) // unexpected
849 /* Evaluating a specific entry, make sure it exists. */
850 nrn
= route_node_lookup(rnh_table
, p
);
851 if (nrn
&& nrn
->info
)
852 zebra_rnh_evaluate_entry(vrfid
, family
, force
, type
,
856 route_unlock_node(nrn
);
858 /* Evaluate entire table. */
859 nrn
= route_top(rnh_table
);
862 zebra_rnh_evaluate_entry(vrfid
, family
, force
,
864 nrn
= route_next(nrn
); /* this will also unlock nrn */
866 nrn
= route_top(rnh_table
);
869 zebra_rnh_clear_nhc_flag(vrfid
, family
, type
,
871 nrn
= route_next(nrn
); /* this will also unlock nrn */
876 void zebra_print_rnh_table(vrf_id_t vrfid
, int af
, struct vty
*vty
,
879 struct route_table
*table
;
880 struct route_node
*rn
;
882 table
= get_rnh_table(vrfid
, af
, type
);
884 zlog_debug("print_rnhs: rnh table not found\n");
888 for (rn
= route_top(table
); rn
; rn
= route_next(rn
))
893 int zebra_cleanup_rnh_client(vrf_id_t vrf_id
, int family
, struct zserv
*client
,
896 struct route_table
*ntable
;
897 struct route_node
*nrn
;
900 if (IS_ZEBRA_DEBUG_NHT
)
901 zlog_debug("%u: Client %s RNH cleanup for family %d type %d",
902 vrf_id
, zebra_route_string(client
->proto
), family
,
905 ntable
= get_rnh_table(vrf_id
, family
, type
);
907 zlog_debug("cleanup_rnh_client: rnh table not found\n");
911 for (nrn
= route_top(ntable
); nrn
; nrn
= route_next(nrn
)) {
916 zebra_remove_rnh_client(rnh
, client
, type
);
922 * free_state - free up the re structure associated with the rnh.
924 static void free_state(vrf_id_t vrf_id
, struct route_entry
*re
,
925 struct route_node
*rn
)
931 /* free RE and nexthops */
932 zebra_deregister_rnh_static_nexthops(vrf_id
, re
->nexthop
, rn
);
933 nexthops_free(re
->nexthop
);
937 static void copy_state(struct rnh
*rnh
, struct route_entry
*re
,
938 struct route_node
*rn
)
940 struct route_entry
*state
;
943 free_state(rnh
->vrf_id
, rnh
->state
, rn
);
950 state
= XCALLOC(MTYPE_RE
, sizeof(struct route_entry
));
951 state
->type
= re
->type
;
952 state
->distance
= re
->distance
;
953 state
->metric
= re
->metric
;
954 state
->vrf_id
= re
->vrf_id
;
955 state
->nh_vrf_id
= re
->vrf_id
;
957 route_entry_copy_nexthops(state
, re
->nexthop
);
961 static int compare_state(struct route_entry
*r1
, struct route_entry
*r2
)
967 if ((!r1
&& r2
) || (r1
&& !r2
))
970 if (r1
->distance
!= r2
->distance
)
973 if (r1
->metric
!= r2
->metric
)
976 if (r1
->nexthop_num
!= r2
->nexthop_num
)
979 if (CHECK_FLAG(r1
->status
, ROUTE_ENTRY_NEXTHOPS_CHANGED
)
980 || CHECK_FLAG(r1
->status
, ROUTE_ENTRY_LABELS_CHANGED
))
986 static int send_client(struct rnh
*rnh
, struct zserv
*client
, rnh_type_t type
,
990 struct route_entry
*re
;
993 struct nexthop
*nexthop
;
994 struct route_node
*rn
;
995 int cmd
= (type
== RNH_IMPORT_CHECK_TYPE
) ? ZEBRA_IMPORT_CHECK_UPDATE
996 : ZEBRA_NEXTHOP_UPDATE
;
1001 /* Get output stream. */
1005 zclient_create_header(s
, cmd
, vrf_id
);
1007 stream_putw(s
, rn
->p
.family
);
1008 switch (rn
->p
.family
) {
1010 stream_putc(s
, rn
->p
.prefixlen
);
1011 stream_put_in_addr(s
, &rn
->p
.u
.prefix4
);
1014 stream_putc(s
, rn
->p
.prefixlen
);
1015 stream_put(s
, &rn
->p
.u
.prefix6
, IPV6_MAX_BYTELEN
);
1018 zlog_err("%s: Unknown family (%d) notification attempted\n",
1019 __FUNCTION__
, rn
->p
.family
);
1023 stream_putc(s
, re
->distance
);
1024 stream_putl(s
, re
->metric
);
1026 nump
= stream_get_endp(s
);
1028 for (nexthop
= re
->nexthop
; nexthop
; nexthop
= nexthop
->next
)
1029 if ((CHECK_FLAG(nexthop
->flags
, NEXTHOP_FLAG_FIB
)
1030 || CHECK_FLAG(nexthop
->flags
,
1031 NEXTHOP_FLAG_RECURSIVE
))
1032 && CHECK_FLAG(nexthop
->flags
,
1033 NEXTHOP_FLAG_ACTIVE
)) {
1034 stream_putc(s
, nexthop
->type
);
1035 switch (nexthop
->type
) {
1036 case NEXTHOP_TYPE_IPV4
:
1037 case NEXTHOP_TYPE_IPV4_IFINDEX
:
1038 stream_put_in_addr(s
,
1039 &nexthop
->gate
.ipv4
);
1040 stream_putl(s
, nexthop
->ifindex
);
1042 case NEXTHOP_TYPE_IFINDEX
:
1043 stream_putl(s
, nexthop
->ifindex
);
1045 case NEXTHOP_TYPE_IPV6
:
1046 case NEXTHOP_TYPE_IPV6_IFINDEX
:
1047 stream_put(s
, &nexthop
->gate
.ipv6
, 16);
1048 stream_putl(s
, nexthop
->ifindex
);
1056 stream_putc_at(s
, nump
, num
);
1058 stream_putc(s
, 0); // distance
1059 stream_putl(s
, 0); // metric
1060 stream_putc(s
, 0); // nexthops
1062 stream_putw_at(s
, 0, stream_get_endp(s
));
1064 client
->nh_last_upd_time
= monotime(NULL
);
1065 client
->last_write_cmd
= cmd
;
1066 return zebra_server_send_message(client
);
1069 static void print_nh(struct nexthop
*nexthop
, struct vty
*vty
)
1072 struct zebra_ns
*zns
= zebra_ns_lookup(NS_DEFAULT
);
1074 switch (nexthop
->type
) {
1075 case NEXTHOP_TYPE_IPV4
:
1076 case NEXTHOP_TYPE_IPV4_IFINDEX
:
1077 vty_out(vty
, " via %s", inet_ntoa(nexthop
->gate
.ipv4
));
1078 if (nexthop
->ifindex
)
1079 vty_out(vty
, ", %s",
1080 ifindex2ifname_per_ns(zns
, nexthop
->ifindex
));
1082 case NEXTHOP_TYPE_IPV6
:
1083 case NEXTHOP_TYPE_IPV6_IFINDEX
:
1085 inet_ntop(AF_INET6
, &nexthop
->gate
.ipv6
, buf
, BUFSIZ
));
1086 if (nexthop
->ifindex
)
1087 vty_out(vty
, ", via %s",
1088 ifindex2ifname_per_ns(zns
, nexthop
->ifindex
));
1090 case NEXTHOP_TYPE_IFINDEX
:
1091 vty_out(vty
, " is directly connected, %s",
1092 ifindex2ifname_per_ns(zns
, nexthop
->ifindex
));
1094 case NEXTHOP_TYPE_BLACKHOLE
:
1095 vty_out(vty
, " is directly connected, Null0");
1103 static void print_rnh(struct route_node
*rn
, struct vty
*vty
)
1106 struct nexthop
*nexthop
;
1107 struct listnode
*node
;
1108 struct zserv
*client
;
1112 vty_out(vty
, "%s%s\n",
1113 inet_ntop(rn
->p
.family
, &rn
->p
.u
.prefix
, buf
, BUFSIZ
),
1114 CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_CONNECTED
) ? "(Connected)"
1117 vty_out(vty
, " resolved via %s\n",
1118 zebra_route_string(rnh
->state
->type
));
1119 for (nexthop
= rnh
->state
->nexthop
; nexthop
;
1120 nexthop
= nexthop
->next
)
1121 print_nh(nexthop
, vty
);
1123 vty_out(vty
, " unresolved%s\n",
1124 CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_CONNECTED
)
1128 vty_out(vty
, " Client list:");
1129 for (ALL_LIST_ELEMENTS_RO(rnh
->client_list
, node
, client
))
1130 vty_out(vty
, " %s(fd %d)%s", zebra_route_string(client
->proto
),
1132 rnh
->filtered
[client
->proto
] ? "(filtered)" : "");
1133 if (!list_isempty(rnh
->zebra_static_route_list
))
1134 vty_out(vty
, " zebra%s",
1135 rnh
->filtered
[ZEBRA_ROUTE_STATIC
] ? "(filtered)" : "");
1136 if (!list_isempty(rnh
->zebra_pseudowire_list
))
1137 vty_out(vty
, " zebra[pseudowires]");