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/zebra_router.h"
40 #include "zebra/rib.h"
42 #include "zebra/zserv.h"
43 #include "zebra/zebra_ns.h"
44 #include "zebra/zebra_vrf.h"
45 #include "zebra/redistribute.h"
46 #include "zebra/debug.h"
47 #include "zebra/zebra_rnh.h"
48 #include "zebra/zebra_routemap.h"
49 #include "zebra/interface.h"
50 #include "zebra/zebra_memory.h"
51 #include "zebra/zebra_errors.h"
53 DEFINE_MTYPE_STATIC(ZEBRA
, RNH
, "Nexthop tracking object")
55 static void free_state(vrf_id_t vrf_id
, struct route_entry
*re
,
56 struct route_node
*rn
);
57 static void copy_state(struct rnh
*rnh
, struct route_entry
*re
,
58 struct route_node
*rn
);
59 static int compare_state(struct route_entry
*r1
, struct route_entry
*r2
);
60 static int send_client(struct rnh
*rnh
, struct zserv
*client
, rnh_type_t type
,
62 static void print_rnh(struct route_node
*rn
, struct vty
*vty
);
63 static int zebra_client_cleanup_rnh(struct zserv
*client
);
65 int zebra_rnh_ip_default_route
= 0;
66 int zebra_rnh_ipv6_default_route
= 0;
68 void zebra_rnh_init(void)
70 hook_register(zserv_client_close
, zebra_client_cleanup_rnh
);
73 static inline struct route_table
*get_rnh_table(vrf_id_t vrfid
, afi_t afi
,
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
[afi
];
85 case RNH_IMPORT_CHECK_TYPE
:
86 t
= zvrf
->import_check_table
[afi
];
93 char *rnh_str(struct rnh
*rnh
, char *buf
, int size
)
95 prefix2str(&(rnh
->node
->p
), buf
, size
);
99 static void zebra_rnh_remove_from_routing_table(struct rnh
*rnh
)
101 struct zebra_vrf
*zvrf
= zebra_vrf_lookup_by_id(rnh
->vrf_id
);
102 struct route_table
*table
= zvrf
->table
[rnh
->afi
][SAFI_UNICAST
];
103 struct route_node
*rn
;
109 rn
= route_node_match(table
, &rnh
->resolved_route
);
113 if (IS_ZEBRA_DEBUG_NHT_DETAILED
) {
114 char buf
[PREFIX_STRLEN
];
115 char buf1
[PREFIX_STRLEN
];
117 zlog_debug("%s: %u:%s removed from tracking on %s",
118 __PRETTY_FUNCTION__
, rnh
->vrf_id
,
119 prefix2str(&rnh
->node
->p
, buf
, sizeof(buf
)),
120 srcdest_rnode2str(rn
, buf1
, sizeof(buf
)));
123 dest
= rib_dest_from_rnode(rn
);
124 rnh_list_del(&dest
->nht
, rnh
);
125 route_unlock_node(rn
);
128 static void zebra_rnh_store_in_routing_table(struct rnh
*rnh
)
130 struct zebra_vrf
*zvrf
= zebra_vrf_lookup_by_id(rnh
->vrf_id
);
131 struct route_table
*table
= zvrf
->table
[rnh
->afi
][SAFI_UNICAST
];
132 struct route_node
*rn
;
135 rn
= route_node_match(table
, &rnh
->resolved_route
);
139 if (IS_ZEBRA_DEBUG_NHT_DETAILED
) {
140 char buf
[PREFIX_STRLEN
];
141 char buf1
[PREFIX_STRLEN
];
143 zlog_debug("%s: %u:%s added for tracking on %s",
144 __PRETTY_FUNCTION__
, rnh
->vrf_id
,
145 prefix2str(&rnh
->node
->p
, buf
, sizeof(buf
)),
146 srcdest_rnode2str(rn
, buf1
, sizeof(buf
)));
149 dest
= rib_dest_from_rnode(rn
);
150 rnh_list_add_tail(&dest
->nht
, rnh
);
151 route_unlock_node(rn
);
154 struct rnh
*zebra_add_rnh(struct prefix
*p
, vrf_id_t vrfid
, rnh_type_t type
,
157 struct route_table
*table
;
158 struct route_node
*rn
;
159 struct rnh
*rnh
= NULL
;
160 char buf
[PREFIX2STR_BUFFER
];
161 afi_t afi
= family2afi(p
->family
);
163 if (IS_ZEBRA_DEBUG_NHT
) {
164 prefix2str(p
, buf
, sizeof(buf
));
165 zlog_debug("%u: Add RNH %s type %s", vrfid
, buf
,
168 table
= get_rnh_table(vrfid
, afi
, type
);
170 prefix2str(p
, buf
, sizeof(buf
));
171 flog_warn(EC_ZEBRA_RNH_NO_TABLE
,
172 "%u: Add RNH %s type %s - table not found", vrfid
,
173 buf
, rnh_type2str(type
));
178 /* Make it sure prefixlen is applied to the prefix. */
181 /* Lookup (or add) route node.*/
182 rn
= route_node_get(table
, p
);
185 rnh
= XCALLOC(MTYPE_RNH
, sizeof(struct rnh
));
188 * The resolved route is already 0.0.0.0/0 or
189 * 0::0/0 due to the calloc right above, but
190 * we should set the family so that future
191 * comparisons can just be done
193 rnh
->resolved_route
.family
= p
->family
;
194 rnh
->client_list
= list_new();
199 rnh
->zebra_pseudowire_list
= list_new();
205 zebra_rnh_store_in_routing_table(rnh
);
209 route_unlock_node(rn
);
213 struct rnh
*zebra_lookup_rnh(struct prefix
*p
, vrf_id_t vrfid
, rnh_type_t type
)
215 struct route_table
*table
;
216 struct route_node
*rn
;
218 table
= get_rnh_table(vrfid
, family2afi(PREFIX_FAMILY(p
)), type
);
222 /* Make it sure prefixlen is applied to the prefix. */
225 /* Lookup route node.*/
226 rn
= route_node_lookup(table
, p
);
230 route_unlock_node(rn
);
234 void zebra_free_rnh(struct rnh
*rnh
)
236 struct zebra_vrf
*zvrf
;
237 struct route_table
*table
;
239 zebra_rnh_remove_from_routing_table(rnh
);
240 rnh
->flags
|= ZEBRA_NHT_DELETED
;
241 list_delete(&rnh
->client_list
);
242 list_delete(&rnh
->zebra_pseudowire_list
);
244 zvrf
= zebra_vrf_lookup_by_id(rnh
->vrf_id
);
245 table
= zvrf
->table
[family2afi(rnh
->resolved_route
.family
)][SAFI_UNICAST
];
248 struct route_node
*rern
;
250 rern
= route_node_match(table
, &rnh
->resolved_route
);
254 route_unlock_node(rern
);
256 dest
= rib_dest_from_rnode(rern
);
257 rnh_list_del(&dest
->nht
, rnh
);
260 free_state(rnh
->vrf_id
, rnh
->state
, rnh
->node
);
261 XFREE(MTYPE_RNH
, rnh
);
264 static void zebra_delete_rnh(struct rnh
*rnh
, rnh_type_t type
)
266 struct route_node
*rn
;
268 if (!list_isempty(rnh
->client_list
)
269 || !list_isempty(rnh
->zebra_pseudowire_list
))
272 if ((rnh
->flags
& ZEBRA_NHT_DELETED
) || !(rn
= rnh
->node
))
275 if (IS_ZEBRA_DEBUG_NHT
) {
276 char buf
[PREFIX2STR_BUFFER
];
277 zlog_debug("%u: Del RNH %s type %s", rnh
->vrf_id
,
278 rnh_str(rnh
, buf
, sizeof(buf
)), rnh_type2str(type
));
283 route_unlock_node(rn
);
287 * This code will send to the registering client
289 * For a rnh that was created, there is no data
290 * so it will send an empty nexthop group
291 * If rnh exists then we know it has been evaluated
292 * and as such it will have a resolved rnh.
294 void zebra_add_rnh_client(struct rnh
*rnh
, struct zserv
*client
,
295 rnh_type_t type
, vrf_id_t vrf_id
)
297 if (IS_ZEBRA_DEBUG_NHT
) {
298 char buf
[PREFIX2STR_BUFFER
];
299 zlog_debug("%u: Client %s registers for RNH %s type %s", vrf_id
,
300 zebra_route_string(client
->proto
),
301 rnh_str(rnh
, buf
, sizeof(buf
)), rnh_type2str(type
));
303 if (!listnode_lookup(rnh
->client_list
, client
))
304 listnode_add(rnh
->client_list
, client
);
307 * We always need to respond with known information,
308 * currently multiple daemons expect this behavior
310 send_client(rnh
, client
, type
, vrf_id
);
313 void zebra_remove_rnh_client(struct rnh
*rnh
, struct zserv
*client
,
316 if (IS_ZEBRA_DEBUG_NHT
) {
317 char buf
[PREFIX2STR_BUFFER
];
318 zlog_debug("Client %s unregisters for RNH %s type %s",
319 zebra_route_string(client
->proto
),
320 rnh_str(rnh
, buf
, sizeof(buf
)), rnh_type2str(type
));
322 listnode_delete(rnh
->client_list
, client
);
323 zebra_delete_rnh(rnh
, type
);
326 /* XXX move this utility function elsewhere? */
327 static void addr2hostprefix(int af
, const union g_addr
*addr
,
328 struct prefix
*prefix
)
332 prefix
->family
= AF_INET
;
333 prefix
->prefixlen
= IPV4_MAX_BITLEN
;
334 prefix
->u
.prefix4
= addr
->ipv4
;
337 prefix
->family
= AF_INET6
;
338 prefix
->prefixlen
= IPV6_MAX_BITLEN
;
339 prefix
->u
.prefix6
= addr
->ipv6
;
342 memset(prefix
, 0, sizeof(*prefix
));
343 zlog_debug("%s: unknown address family %d", __func__
, af
);
348 void zebra_register_rnh_pseudowire(vrf_id_t vrf_id
, struct zebra_pw
*pw
)
353 struct zebra_vrf
*zvrf
;
355 zvrf
= vrf_info_lookup(vrf_id
);
359 addr2hostprefix(pw
->af
, &pw
->nexthop
, &nh
);
360 rnh
= zebra_add_rnh(&nh
, vrf_id
, RNH_NEXTHOP_TYPE
, &exists
);
361 if (rnh
&& !listnode_lookup(rnh
->zebra_pseudowire_list
, pw
)) {
362 listnode_add(rnh
->zebra_pseudowire_list
, pw
);
364 zebra_evaluate_rnh(zvrf
, family2afi(pw
->af
), 1,
365 RNH_NEXTHOP_TYPE
, &nh
);
369 void zebra_deregister_rnh_pseudowire(vrf_id_t vrf_id
, struct zebra_pw
*pw
)
377 listnode_delete(rnh
->zebra_pseudowire_list
, pw
);
380 zebra_delete_rnh(rnh
, RNH_NEXTHOP_TYPE
);
383 /* Clear the NEXTHOP_FLAG_RNH_FILTERED flags on all nexthops
385 static void zebra_rnh_clear_nexthop_rnh_filters(struct route_entry
*re
)
387 struct nexthop
*nexthop
;
390 for (nexthop
= re
->ng
.nexthop
; nexthop
;
391 nexthop
= nexthop
->next
) {
392 UNSET_FLAG(nexthop
->flags
, NEXTHOP_FLAG_RNH_FILTERED
);
397 /* Apply the NHT route-map for a client to the route (and nexthops)
400 static int zebra_rnh_apply_nht_rmap(afi_t afi
, struct zebra_vrf
*zvrf
,
401 struct route_node
*prn
,
402 struct route_entry
*re
, int proto
)
404 int at_least_one
= 0;
405 struct nexthop
*nexthop
;
409 for (nexthop
= re
->ng
.nexthop
; nexthop
;
410 nexthop
= nexthop
->next
) {
411 ret
= zebra_nht_route_map_check(
412 afi
, proto
, &prn
->p
, zvrf
, re
, nexthop
);
413 if (ret
!= RMAP_DENYMATCH
)
414 at_least_one
++; /* at least one valid NH */
416 SET_FLAG(nexthop
->flags
,
417 NEXTHOP_FLAG_RNH_FILTERED
);
421 return (at_least_one
);
425 * Determine appropriate route (RE entry) resolving a tracked BGP route
426 * for BGP route for import.
428 static struct route_entry
*
429 zebra_rnh_resolve_import_entry(struct zebra_vrf
*zvrf
, afi_t afi
,
430 struct route_node
*nrn
, struct rnh
*rnh
,
431 struct route_node
**prn
)
433 struct route_table
*route_table
;
434 struct route_node
*rn
;
435 struct route_entry
*re
;
439 route_table
= zvrf
->table
[afi
][SAFI_UNICAST
];
440 if (!route_table
) // unexpected
443 rn
= route_node_match(route_table
, &nrn
->p
);
447 /* Unlock route node - we don't need to lock when walking the tree. */
448 route_unlock_node(rn
);
450 if (CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_EXACT_MATCH
)
451 && !prefix_same(&nrn
->p
, &rn
->p
))
454 if (IS_ZEBRA_DEBUG_NHT_DETAILED
) {
455 char buf
[PREFIX_STRLEN
];
456 char buf1
[PREFIX_STRLEN
];
458 zlog_debug("%s: %u:%s Resolved Import Entry to %s",
459 __PRETTY_FUNCTION__
, rnh
->vrf_id
,
460 prefix2str(&rnh
->node
->p
, buf
, sizeof(buf
)),
461 srcdest_rnode2str(rn
, buf1
, sizeof(buf
)));
464 /* Identify appropriate route entry. */
465 RNODE_FOREACH_RE (rn
, re
) {
466 if (!CHECK_FLAG(re
->status
, ROUTE_ENTRY_REMOVED
)
467 && CHECK_FLAG(re
->flags
, ZEBRA_FLAG_SELECTED
)
468 && (re
->type
!= ZEBRA_ROUTE_BGP
))
475 if (!re
&& IS_ZEBRA_DEBUG_NHT_DETAILED
)
476 zlog_debug("\tRejected due to removed or is a bgp route");
482 * See if a tracked route entry for import (by BGP) has undergone any
483 * change, and if so, notify the client.
485 static void zebra_rnh_eval_import_check_entry(struct zebra_vrf
*zvrf
, afi_t afi
,
486 int force
, struct route_node
*nrn
,
488 struct route_node
*prn
,
489 struct route_entry
*re
)
491 int state_changed
= 0;
492 struct zserv
*client
;
493 char bufn
[INET6_ADDRSTRLEN
];
494 struct listnode
*node
;
496 zebra_rnh_remove_from_routing_table(rnh
);
498 prefix_copy(&rnh
->resolved_route
, &prn
->p
);
500 int family
= rnh
->resolved_route
.family
;
502 memset(&rnh
->resolved_route
.family
, 0, sizeof(struct prefix
));
503 rnh
->resolved_route
.family
= family
;
505 zebra_rnh_store_in_routing_table(rnh
);
507 if (re
&& (rnh
->state
== NULL
)) {
508 if (CHECK_FLAG(re
->status
, ROUTE_ENTRY_INSTALLED
))
510 } else if (!re
&& (rnh
->state
!= NULL
))
513 if (compare_state(re
, rnh
->state
)) {
514 copy_state(rnh
, re
, nrn
);
518 if (state_changed
|| force
) {
519 if (IS_ZEBRA_DEBUG_NHT
) {
520 prefix2str(&nrn
->p
, bufn
, INET6_ADDRSTRLEN
);
521 zlog_debug("%u:%s: Route import check %s %s",
523 bufn
, rnh
->state
? "passed" : "failed",
524 state_changed
? "(state changed)" : "");
526 /* state changed, notify clients */
527 for (ALL_LIST_ELEMENTS_RO(rnh
->client_list
, node
, client
)) {
528 send_client(rnh
, client
,
529 RNH_IMPORT_CHECK_TYPE
, zvrf
->vrf
->vrf_id
);
535 * Notify clients registered for this nexthop about a change.
537 static void zebra_rnh_notify_protocol_clients(struct zebra_vrf
*zvrf
, afi_t afi
,
538 struct route_node
*nrn
,
540 struct route_node
*prn
,
541 struct route_entry
*re
)
543 struct listnode
*node
;
544 struct zserv
*client
;
545 char bufn
[INET6_ADDRSTRLEN
];
546 char bufp
[INET6_ADDRSTRLEN
];
547 int num_resolving_nh
;
549 if (IS_ZEBRA_DEBUG_NHT
) {
550 prefix2str(&nrn
->p
, bufn
, INET6_ADDRSTRLEN
);
552 srcdest_rnode2str(prn
, bufp
, INET6_ADDRSTRLEN
);
553 zlog_debug("%u:%s: NH resolved over route %s",
554 zvrf
->vrf
->vrf_id
, bufn
, bufp
);
556 zlog_debug("%u:%s: NH has become unresolved",
557 zvrf
->vrf
->vrf_id
, bufn
);
560 for (ALL_LIST_ELEMENTS_RO(rnh
->client_list
, node
, client
)) {
562 /* Apply route-map for this client to route resolving
564 * nexthop to see if it is filtered or not.
566 zebra_rnh_clear_nexthop_rnh_filters(re
);
567 num_resolving_nh
= zebra_rnh_apply_nht_rmap(
568 afi
, zvrf
, prn
, re
, client
->proto
);
569 if (num_resolving_nh
)
570 rnh
->filtered
[client
->proto
] = 0;
572 rnh
->filtered
[client
->proto
] = 1;
574 if (IS_ZEBRA_DEBUG_NHT
)
576 "%u:%s: Notifying client %s about NH %s",
577 zvrf
->vrf
->vrf_id
, bufn
,
578 zebra_route_string(client
->proto
),
581 : "(filtered by route-map)");
583 rnh
->filtered
[client
->proto
] = 0;
584 if (IS_ZEBRA_DEBUG_NHT
)
586 "%u:%s: Notifying client %s about NH (unreachable)",
587 zvrf
->vrf
->vrf_id
, bufn
,
588 zebra_route_string(client
->proto
));
591 send_client(rnh
, client
, RNH_NEXTHOP_TYPE
, zvrf
->vrf
->vrf_id
);
595 zebra_rnh_clear_nexthop_rnh_filters(re
);
599 * Utility to determine whether a candidate nexthop is useable. We make this
600 * check in a couple of places, so this is a single home for the logic we
603 static bool rnh_nexthop_valid(const struct route_entry
*re
,
604 const struct nexthop
*nh
)
606 return (CHECK_FLAG(re
->status
, ROUTE_ENTRY_INSTALLED
)
607 && CHECK_FLAG(nh
->flags
, NEXTHOP_FLAG_ACTIVE
)
608 && !CHECK_FLAG(nh
->flags
, NEXTHOP_FLAG_RECURSIVE
)
609 && !CHECK_FLAG(nh
->flags
, NEXTHOP_FLAG_DUPLICATE
)
610 && !CHECK_FLAG(nh
->flags
, NEXTHOP_FLAG_RNH_FILTERED
));
614 * Determine appropriate route (route entry) resolving a tracked
617 static struct route_entry
*
618 zebra_rnh_resolve_nexthop_entry(struct zebra_vrf
*zvrf
, afi_t afi
,
619 struct route_node
*nrn
, struct rnh
*rnh
,
620 struct route_node
**prn
)
622 struct route_table
*route_table
;
623 struct route_node
*rn
;
624 struct route_entry
*re
;
625 struct nexthop
*nexthop
;
629 route_table
= zvrf
->table
[afi
][SAFI_UNICAST
];
633 rn
= route_node_match(route_table
, &nrn
->p
);
637 /* Unlock route node - we don't need to lock when walking the tree. */
638 route_unlock_node(rn
);
640 /* While resolving nexthops, we may need to walk up the tree from the
641 * most-specific match. Do similar logic as in zebra_rib.c
644 if (IS_ZEBRA_DEBUG_NHT_DETAILED
) {
645 char buf
[PREFIX_STRLEN
];
646 char buf1
[PREFIX_STRLEN
];
648 zlog_debug("%s: %u:%s Possible Match to %s",
649 __PRETTY_FUNCTION__
, rnh
->vrf_id
,
650 prefix2str(&rnh
->node
->p
, buf
, sizeof(buf
)),
651 srcdest_rnode2str(rn
, buf1
, sizeof(buf
)));
654 /* Do not resolve over default route unless allowed &&
655 * match route to be exact if so specified
657 if (is_default_prefix(&rn
->p
)
658 && !rnh_resolve_via_default(rn
->p
.family
)) {
659 if (IS_ZEBRA_DEBUG_NHT_DETAILED
)
661 "\tNot allowed to resolve through default prefix");
665 /* Identify appropriate route entry. */
666 RNODE_FOREACH_RE (rn
, re
) {
667 if (CHECK_FLAG(re
->status
, ROUTE_ENTRY_REMOVED
)) {
668 if (IS_ZEBRA_DEBUG_NHT_DETAILED
)
670 "\tRoute Entry %s removed",
671 zebra_route_string(re
->type
));
674 if (!CHECK_FLAG(re
->flags
, ZEBRA_FLAG_SELECTED
)) {
675 if (IS_ZEBRA_DEBUG_NHT_DETAILED
)
677 "\tRoute Entry %s !selected",
678 zebra_route_string(re
->type
));
682 /* Just being SELECTED isn't quite enough - must
683 * have an installed nexthop to be useful.
685 for (ALL_NEXTHOPS(re
->ng
, nexthop
)) {
686 if (rnh_nexthop_valid(re
, nexthop
))
690 if (nexthop
== NULL
) {
691 if (IS_ZEBRA_DEBUG_NHT_DETAILED
)
693 "\tRoute Entry %s no nexthops",
694 zebra_route_string(re
->type
));
698 if (CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_CONNECTED
)) {
699 if ((re
->type
== ZEBRA_ROUTE_CONNECT
)
700 || (re
->type
== ZEBRA_ROUTE_STATIC
))
702 if (re
->type
== ZEBRA_ROUTE_NHRP
) {
704 for (nexthop
= re
->ng
.nexthop
; nexthop
;
705 nexthop
= nexthop
->next
)
707 == NEXTHOP_TYPE_IFINDEX
)
716 /* Route entry found, we're done; else, walk up the tree. */
722 if (!CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_CONNECTED
))
725 if (IS_ZEBRA_DEBUG_NHT_DETAILED
)
727 "\tNexthop must be connected, cannot recurse up");
735 static void zebra_rnh_process_pseudowires(vrf_id_t vrfid
, struct rnh
*rnh
)
738 struct listnode
*node
;
740 for (ALL_LIST_ELEMENTS_RO(rnh
->zebra_pseudowire_list
, node
, pw
))
745 * See if a tracked nexthop entry has undergone any change, and if so,
746 * take appropriate action; this involves notifying any clients and/or
747 * scheduling dependent static routes for processing.
749 static void zebra_rnh_eval_nexthop_entry(struct zebra_vrf
*zvrf
, afi_t afi
,
750 int force
, struct route_node
*nrn
,
752 struct route_node
*prn
,
753 struct route_entry
*re
)
755 int state_changed
= 0;
757 /* If we're resolving over a different route, resolution has changed or
758 * the resolving route has some change (e.g., metric), there is a state
761 zebra_rnh_remove_from_routing_table(rnh
);
762 if (!prefix_same(&rnh
->resolved_route
, prn
? NULL
: &prn
->p
)) {
764 prefix_copy(&rnh
->resolved_route
, &prn
->p
);
767 * Just quickly store the family of the resolved
768 * route so that we can reset it in a second here
770 int family
= rnh
->resolved_route
.family
;
772 memset(&rnh
->resolved_route
, 0, sizeof(struct prefix
));
773 rnh
->resolved_route
.family
= family
;
776 copy_state(rnh
, re
, nrn
);
778 } else if (compare_state(re
, rnh
->state
)) {
779 copy_state(rnh
, re
, nrn
);
782 zebra_rnh_store_in_routing_table(rnh
);
784 if (state_changed
|| force
) {
785 /* NOTE: Use the "copy" of resolving route stored in 'rnh' i.e.,
788 /* Notify registered protocol clients. */
789 zebra_rnh_notify_protocol_clients(zvrf
, afi
, nrn
, rnh
, prn
,
792 /* Process pseudowires attached to this nexthop */
793 zebra_rnh_process_pseudowires(zvrf
->vrf
->vrf_id
, rnh
);
797 /* Evaluate one tracked entry */
798 static void zebra_rnh_evaluate_entry(struct zebra_vrf
*zvrf
, afi_t afi
,
799 int force
, rnh_type_t type
,
800 struct route_node
*nrn
)
803 struct route_entry
*re
;
804 struct route_node
*prn
;
805 char bufn
[INET6_ADDRSTRLEN
];
807 if (IS_ZEBRA_DEBUG_NHT
) {
808 prefix2str(&nrn
->p
, bufn
, INET6_ADDRSTRLEN
);
809 zlog_debug("%u:%s: Evaluate RNH, type %s %s", zvrf
->vrf
->vrf_id
,
810 bufn
, rnh_type2str(type
), force
? "(force)" : "");
815 /* Identify route entry (RE) resolving this tracked entry. */
816 if (type
== RNH_IMPORT_CHECK_TYPE
)
817 re
= zebra_rnh_resolve_import_entry(zvrf
, afi
, nrn
, rnh
, &prn
);
819 re
= zebra_rnh_resolve_nexthop_entry(zvrf
, afi
, nrn
, rnh
, &prn
);
821 /* If the entry cannot be resolved and that is also the existing state,
822 * there is nothing further to do.
824 if (!re
&& rnh
->state
== NULL
&& !force
)
827 /* Process based on type of entry. */
828 if (type
== RNH_IMPORT_CHECK_TYPE
)
829 zebra_rnh_eval_import_check_entry(zvrf
, afi
, force
, nrn
, rnh
,
832 zebra_rnh_eval_nexthop_entry(zvrf
, afi
, force
, nrn
, rnh
, prn
,
837 * Clear the ROUTE_ENTRY_NEXTHOPS_CHANGED flag
838 * from the re entries.
840 * Please note we are doing this *after* we have
841 * notified the world about each nexthop as that
842 * we can have a situation where one re entry
843 * covers multiple nexthops we are interested in.
845 static void zebra_rnh_clear_nhc_flag(struct zebra_vrf
*zvrf
, afi_t afi
,
846 rnh_type_t type
, struct route_node
*nrn
)
849 struct route_entry
*re
;
850 struct route_node
*prn
;
854 /* Identify route entry (RIB) resolving this tracked entry. */
855 if (type
== RNH_IMPORT_CHECK_TYPE
)
856 re
= zebra_rnh_resolve_import_entry(zvrf
, afi
, nrn
, rnh
,
859 re
= zebra_rnh_resolve_nexthop_entry(zvrf
, afi
, nrn
, rnh
,
863 UNSET_FLAG(re
->status
, ROUTE_ENTRY_NEXTHOPS_CHANGED
);
864 UNSET_FLAG(re
->status
, ROUTE_ENTRY_LABELS_CHANGED
);
868 /* Evaluate all tracked entries (nexthops or routes for import into BGP)
869 * of a particular VRF and address-family or a specific prefix.
871 void zebra_evaluate_rnh(struct zebra_vrf
*zvrf
, afi_t afi
, int force
,
872 rnh_type_t type
, struct prefix
*p
)
874 struct route_table
*rnh_table
;
875 struct route_node
*nrn
;
877 rnh_table
= get_rnh_table(zvrf
->vrf
->vrf_id
, afi
, type
);
878 if (!rnh_table
) // unexpected
882 /* Evaluating a specific entry, make sure it exists. */
883 nrn
= route_node_lookup(rnh_table
, p
);
884 if (nrn
&& nrn
->info
)
885 zebra_rnh_evaluate_entry(zvrf
, afi
, force
, type
, nrn
);
888 route_unlock_node(nrn
);
890 /* Evaluate entire table. */
891 nrn
= route_top(rnh_table
);
894 zebra_rnh_evaluate_entry(zvrf
, afi
, force
, type
,
896 nrn
= route_next(nrn
); /* this will also unlock nrn */
898 nrn
= route_top(rnh_table
);
901 zebra_rnh_clear_nhc_flag(zvrf
, afi
, type
, nrn
);
902 nrn
= route_next(nrn
); /* this will also unlock nrn */
907 void zebra_print_rnh_table(vrf_id_t vrfid
, afi_t afi
, struct vty
*vty
,
908 rnh_type_t type
, struct prefix
*p
)
910 struct route_table
*table
;
911 struct route_node
*rn
;
913 table
= get_rnh_table(vrfid
, afi
, type
);
915 zlog_debug("print_rnhs: rnh table not found");
919 for (rn
= route_top(table
); rn
; rn
= route_next(rn
)) {
920 if (p
&& prefix_cmp(&rn
->p
, p
) != 0)
929 * free_state - free up the re structure associated with the rnh.
931 static void free_state(vrf_id_t vrf_id
, struct route_entry
*re
,
932 struct route_node
*rn
)
937 /* free RE and nexthops */
938 nexthops_free(re
->ng
.nexthop
);
942 static void copy_state(struct rnh
*rnh
, struct route_entry
*re
,
943 struct route_node
*rn
)
945 struct route_entry
*state
;
948 free_state(rnh
->vrf_id
, rnh
->state
, rn
);
955 state
= XCALLOC(MTYPE_RE
, sizeof(struct route_entry
));
956 state
->type
= re
->type
;
957 state
->distance
= re
->distance
;
958 state
->metric
= re
->metric
;
959 state
->vrf_id
= re
->vrf_id
;
960 state
->status
= re
->status
;
962 route_entry_copy_nexthops(state
, re
->ng
.nexthop
);
966 static int compare_state(struct route_entry
*r1
, struct route_entry
*r2
)
972 if ((!r1
&& r2
) || (r1
&& !r2
))
975 if (r1
->distance
!= r2
->distance
)
978 if (r1
->metric
!= r2
->metric
)
981 if (r1
->nexthop_num
!= r2
->nexthop_num
)
984 if (CHECK_FLAG(r1
->status
, ROUTE_ENTRY_NEXTHOPS_CHANGED
)
985 || CHECK_FLAG(r1
->status
, ROUTE_ENTRY_LABELS_CHANGED
))
991 static int send_client(struct rnh
*rnh
, struct zserv
*client
, rnh_type_t type
,
995 struct route_entry
*re
;
999 struct route_node
*rn
;
1000 int cmd
= (type
== RNH_IMPORT_CHECK_TYPE
) ? ZEBRA_IMPORT_CHECK_UPDATE
1001 : ZEBRA_NEXTHOP_UPDATE
;
1006 /* Get output stream. */
1007 s
= stream_new(ZEBRA_MAX_PACKET_SIZ
);
1009 zclient_create_header(s
, cmd
, vrf_id
);
1011 stream_putw(s
, rn
->p
.family
);
1012 switch (rn
->p
.family
) {
1014 stream_putc(s
, rn
->p
.prefixlen
);
1015 stream_put_in_addr(s
, &rn
->p
.u
.prefix4
);
1018 stream_putc(s
, rn
->p
.prefixlen
);
1019 stream_put(s
, &rn
->p
.u
.prefix6
, IPV6_MAX_BYTELEN
);
1022 flog_err(EC_ZEBRA_RNH_UNKNOWN_FAMILY
,
1023 "%s: Unknown family (%d) notification attempted\n",
1024 __FUNCTION__
, rn
->p
.family
);
1028 stream_putc(s
, re
->type
);
1029 stream_putw(s
, re
->instance
);
1030 stream_putc(s
, re
->distance
);
1031 stream_putl(s
, re
->metric
);
1033 nump
= stream_get_endp(s
);
1035 for (ALL_NEXTHOPS(re
->ng
, nh
))
1036 if (rnh_nexthop_valid(re
, nh
)) {
1037 stream_putl(s
, nh
->vrf_id
);
1038 stream_putc(s
, nh
->type
);
1040 case NEXTHOP_TYPE_IPV4
:
1041 case NEXTHOP_TYPE_IPV4_IFINDEX
:
1042 stream_put_in_addr(s
, &nh
->gate
.ipv4
);
1043 stream_putl(s
, nh
->ifindex
);
1045 case NEXTHOP_TYPE_IFINDEX
:
1046 stream_putl(s
, nh
->ifindex
);
1048 case NEXTHOP_TYPE_IPV6
:
1049 case NEXTHOP_TYPE_IPV6_IFINDEX
:
1050 stream_put(s
, &nh
->gate
.ipv6
, 16);
1051 stream_putl(s
, nh
->ifindex
);
1059 nh
->nh_label
->num_labels
);
1060 if (nh
->nh_label
->num_labels
)
1063 &nh
->nh_label
->label
[0],
1064 nh
->nh_label
->num_labels
1065 * sizeof(mpls_label_t
));
1070 stream_putc_at(s
, nump
, num
);
1072 stream_putc(s
, 0); // type
1073 stream_putw(s
, 0); // instance
1074 stream_putc(s
, 0); // distance
1075 stream_putl(s
, 0); // metric
1076 stream_putc(s
, 0); // nexthops
1078 stream_putw_at(s
, 0, stream_get_endp(s
));
1080 client
->nh_last_upd_time
= monotime(NULL
);
1081 client
->last_write_cmd
= cmd
;
1082 return zserv_send_message(client
, s
);
1085 static void print_nh(struct nexthop
*nexthop
, struct vty
*vty
)
1088 struct zebra_ns
*zns
= zebra_ns_lookup(nexthop
->vrf_id
);
1090 switch (nexthop
->type
) {
1091 case NEXTHOP_TYPE_IPV4
:
1092 case NEXTHOP_TYPE_IPV4_IFINDEX
:
1093 vty_out(vty
, " via %s", inet_ntoa(nexthop
->gate
.ipv4
));
1094 if (nexthop
->ifindex
)
1095 vty_out(vty
, ", %s",
1096 ifindex2ifname_per_ns(zns
, nexthop
->ifindex
));
1098 case NEXTHOP_TYPE_IPV6
:
1099 case NEXTHOP_TYPE_IPV6_IFINDEX
:
1101 inet_ntop(AF_INET6
, &nexthop
->gate
.ipv6
, buf
, BUFSIZ
));
1102 if (nexthop
->ifindex
)
1103 vty_out(vty
, ", via %s",
1104 ifindex2ifname_per_ns(zns
, nexthop
->ifindex
));
1106 case NEXTHOP_TYPE_IFINDEX
:
1107 vty_out(vty
, " is directly connected, %s",
1108 ifindex2ifname_per_ns(zns
, nexthop
->ifindex
));
1110 case NEXTHOP_TYPE_BLACKHOLE
:
1111 vty_out(vty
, " is directly connected, Null0");
1119 static void print_rnh(struct route_node
*rn
, struct vty
*vty
)
1122 struct nexthop
*nexthop
;
1123 struct listnode
*node
;
1124 struct zserv
*client
;
1128 vty_out(vty
, "%s%s\n",
1129 inet_ntop(rn
->p
.family
, &rn
->p
.u
.prefix
, buf
, BUFSIZ
),
1130 CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_CONNECTED
) ? "(Connected)"
1133 vty_out(vty
, " resolved via %s\n",
1134 zebra_route_string(rnh
->state
->type
));
1135 for (nexthop
= rnh
->state
->ng
.nexthop
; nexthop
;
1136 nexthop
= nexthop
->next
)
1137 print_nh(nexthop
, vty
);
1139 vty_out(vty
, " unresolved%s\n",
1140 CHECK_FLAG(rnh
->flags
, ZEBRA_NHT_CONNECTED
)
1144 vty_out(vty
, " Client list:");
1145 for (ALL_LIST_ELEMENTS_RO(rnh
->client_list
, node
, client
))
1146 vty_out(vty
, " %s(fd %d)%s", zebra_route_string(client
->proto
),
1148 rnh
->filtered
[client
->proto
] ? "(filtered)" : "");
1149 if (!list_isempty(rnh
->zebra_pseudowire_list
))
1150 vty_out(vty
, " zebra[pseudowires]");
1154 static int zebra_cleanup_rnh_client(vrf_id_t vrf_id
, afi_t afi
,
1155 struct zserv
*client
, rnh_type_t type
)
1157 struct route_table
*ntable
;
1158 struct route_node
*nrn
;
1161 if (IS_ZEBRA_DEBUG_NHT
)
1162 zlog_debug("%u: Client %s RNH cleanup for family %s type %s",
1163 vrf_id
, zebra_route_string(client
->proto
),
1164 afi2str(afi
), rnh_type2str(type
));
1166 ntable
= get_rnh_table(vrf_id
, afi
, type
);
1168 zlog_debug("cleanup_rnh_client: rnh table not found");
1172 for (nrn
= route_top(ntable
); nrn
; nrn
= route_next(nrn
)) {
1177 zebra_remove_rnh_client(rnh
, client
, type
);
1182 /* Cleanup registered nexthops (across VRFs) upon client disconnect. */
1183 static int zebra_client_cleanup_rnh(struct zserv
*client
)
1186 struct zebra_vrf
*zvrf
;
1188 RB_FOREACH (vrf
, vrf_id_head
, &vrfs_by_id
) {
1191 zebra_cleanup_rnh_client(zvrf_id(zvrf
), AFI_IP
, client
,
1193 zebra_cleanup_rnh_client(zvrf_id(zvrf
), AFI_IP6
, client
,
1195 zebra_cleanup_rnh_client(zvrf_id(zvrf
), AFI_IP
, client
,
1196 RNH_IMPORT_CHECK_TYPE
);
1197 zebra_cleanup_rnh_client(zvrf_id(zvrf
), AFI_IP6
, client
,
1198 RNH_IMPORT_CHECK_TYPE
);
1199 if (client
->proto
== ZEBRA_ROUTE_LDP
) {
1200 hash_iterate(zvrf
->lsp_table
,
1201 mpls_ldp_lsp_uninstall_all
,
1203 mpls_ldp_ftn_uninstall_all(zvrf
, AFI_IP
);
1204 mpls_ldp_ftn_uninstall_all(zvrf
, AFI_IP6
);