3 * Copyright (C) 2017 Cumulus Networks, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
30 #include "pimd/pim_nht.h"
34 #include "pim_ifchannel.h"
35 #include "pim_mroute.h"
36 #include "pim_zebra.h"
37 #include "pim_upstream.h"
39 #include "pim_jp_agg.h"
40 #include "pim_zebra.h"
41 #include "pim_zlookup.h"
45 * pim_sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister
48 void pim_sendmsg_zebra_rnh(struct pim_instance
*pim
, struct zclient
*zclient
,
49 struct pim_nexthop_cache
*pnc
, int command
)
54 p
= &(pnc
->rpf
.rpf_addr
);
55 ret
= zclient_send_rnh(zclient
, command
, p
, false, pim
->vrf_id
);
57 zlog_warn("sendmsg_nexthop: zclient_send_message() failed");
59 if (PIM_DEBUG_PIM_NHT
) {
60 char buf
[PREFIX2STR_BUFFER
];
61 prefix2str(p
, buf
, sizeof(buf
));
63 "%s: NHT %sregistered addr %s(%s) with Zebra ret:%d ",
65 (command
== ZEBRA_NEXTHOP_REGISTER
) ? " " : "de", buf
,
72 struct pim_nexthop_cache
*pim_nexthop_cache_find(struct pim_instance
*pim
,
75 struct pim_nexthop_cache
*pnc
= NULL
;
76 struct pim_nexthop_cache lookup
;
78 lookup
.rpf
.rpf_addr
.family
= rpf
->rpf_addr
.family
;
79 lookup
.rpf
.rpf_addr
.prefixlen
= rpf
->rpf_addr
.prefixlen
;
80 lookup
.rpf
.rpf_addr
.u
.prefix4
.s_addr
= rpf
->rpf_addr
.u
.prefix4
.s_addr
;
82 pnc
= hash_lookup(pim
->rpf_hash
, &lookup
);
87 static struct pim_nexthop_cache
*pim_nexthop_cache_add(struct pim_instance
*pim
,
88 struct pim_rpf
*rpf_addr
)
90 struct pim_nexthop_cache
*pnc
;
94 pnc
= XCALLOC(MTYPE_PIM_NEXTHOP_CACHE
,
95 sizeof(struct pim_nexthop_cache
));
96 pnc
->rpf
.rpf_addr
.family
= rpf_addr
->rpf_addr
.family
;
97 pnc
->rpf
.rpf_addr
.prefixlen
= rpf_addr
->rpf_addr
.prefixlen
;
98 pnc
->rpf
.rpf_addr
.u
.prefix4
.s_addr
=
99 rpf_addr
->rpf_addr
.u
.prefix4
.s_addr
;
101 pnc
= hash_get(pim
->rpf_hash
, pnc
, hash_alloc_intern
);
103 pnc
->rp_list
= list_new();
104 pnc
->rp_list
->cmp
= pim_rp_list_cmp
;
106 snprintf(hash_name
, 64, "PNC %s(%s) Upstream Hash",
107 prefix2str(&pnc
->rpf
.rpf_addr
, buf1
, 64), pim
->vrf
->name
);
108 pnc
->upstream_hash
= hash_create_size(8192, pim_upstream_hash_key
,
109 pim_upstream_equal
, hash_name
);
115 * pim_find_or_track_nexthop
117 * This API is used to Register an address with Zebra
122 int pim_find_or_track_nexthop(struct pim_instance
*pim
, struct prefix
*addr
,
123 struct pim_upstream
*up
, struct rp_info
*rp
,
124 struct pim_nexthop_cache
*out_pnc
)
126 struct pim_nexthop_cache
*pnc
= NULL
;
128 struct listnode
*ch_node
= NULL
;
129 struct zclient
*zclient
= NULL
;
131 zclient
= pim_zebra_zclient_get();
132 memset(&rpf
, 0, sizeof(struct pim_rpf
));
133 rpf
.rpf_addr
.family
= addr
->family
;
134 rpf
.rpf_addr
.prefixlen
= addr
->prefixlen
;
135 rpf
.rpf_addr
.u
.prefix4
= addr
->u
.prefix4
;
137 pnc
= pim_nexthop_cache_find(pim
, &rpf
);
139 pnc
= pim_nexthop_cache_add(pim
, &rpf
);
140 pim_sendmsg_zebra_rnh(pim
, zclient
, pnc
,
141 ZEBRA_NEXTHOP_REGISTER
);
142 if (PIM_DEBUG_PIM_NHT
) {
143 char buf
[PREFIX2STR_BUFFER
];
144 prefix2str(addr
, buf
, sizeof(buf
));
146 "%s: NHT cache and zebra notification added for %s(%s)",
147 __PRETTY_FUNCTION__
, buf
, pim
->vrf
->name
);
152 ch_node
= listnode_lookup(pnc
->rp_list
, rp
);
154 listnode_add_sort(pnc
->rp_list
, rp
);
158 hash_get(pnc
->upstream_hash
, up
, hash_alloc_intern
);
160 if (CHECK_FLAG(pnc
->flags
, PIM_NEXTHOP_VALID
)) {
162 memcpy(out_pnc
, pnc
, sizeof(struct pim_nexthop_cache
));
169 void pim_delete_tracked_nexthop(struct pim_instance
*pim
, struct prefix
*addr
,
170 struct pim_upstream
*up
, struct rp_info
*rp
)
172 struct pim_nexthop_cache
*pnc
= NULL
;
173 struct pim_nexthop_cache lookup
;
174 struct zclient
*zclient
= NULL
;
175 struct listnode
*upnode
= NULL
;
176 struct pim_upstream
*upstream
= NULL
;
178 zclient
= pim_zebra_zclient_get();
180 /* Remove from RPF hash if it is the last entry */
181 lookup
.rpf
.rpf_addr
= *addr
;
182 pnc
= hash_lookup(pim
->rpf_hash
, &lookup
);
185 /* Release the (*, G)upstream from pnc->upstream_hash,
186 * whose Group belongs to the RP getting deleted
188 for (ALL_LIST_ELEMENTS_RO(pim
->upstream_list
, upnode
,
191 struct rp_info
*trp_info
;
193 if (upstream
->sg
.src
.s_addr
!= INADDR_ANY
)
196 grp
.family
= AF_INET
;
197 grp
.prefixlen
= IPV4_MAX_BITLEN
;
198 grp
.u
.prefix4
= upstream
->sg
.grp
;
200 trp_info
= pim_rp_find_match_group(pim
, &grp
);
202 hash_release(pnc
->upstream_hash
,
205 listnode_delete(pnc
->rp_list
, rp
);
209 hash_release(pnc
->upstream_hash
, up
);
211 if (PIM_DEBUG_PIM_NHT
) {
212 char buf
[PREFIX_STRLEN
];
213 prefix2str(addr
, buf
, sizeof buf
);
215 "%s: NHT %s(%s) rp_list count:%d upstream count:%ld",
216 __PRETTY_FUNCTION__
, buf
, pim
->vrf
->name
,
217 pnc
->rp_list
->count
, pnc
->upstream_hash
->count
);
220 if (pnc
->rp_list
->count
== 0
221 && pnc
->upstream_hash
->count
== 0) {
222 pim_sendmsg_zebra_rnh(pim
, zclient
, pnc
,
223 ZEBRA_NEXTHOP_UNREGISTER
);
225 list_delete(&pnc
->rp_list
);
226 hash_free(pnc
->upstream_hash
);
228 hash_release(pim
->rpf_hash
, pnc
);
230 nexthops_free(pnc
->nexthop
);
231 XFREE(MTYPE_PIM_NEXTHOP_CACHE
, pnc
);
236 void pim_rp_nexthop_del(struct rp_info
*rp_info
)
238 rp_info
->rp
.source_nexthop
.interface
= NULL
;
239 rp_info
->rp
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
.s_addr
=
241 rp_info
->rp
.source_nexthop
.mrib_metric_preference
=
242 router
->infinite_assert_metric
.metric_preference
;
243 rp_info
->rp
.source_nexthop
.mrib_route_metric
=
244 router
->infinite_assert_metric
.route_metric
;
247 /* Update RP nexthop info based on Nexthop update received from Zebra.*/
248 static void pim_update_rp_nh(struct pim_instance
*pim
,
249 struct pim_nexthop_cache
*pnc
)
251 struct listnode
*node
= NULL
;
252 struct rp_info
*rp_info
= NULL
;
254 /*Traverse RP list and update each RP Nexthop info */
255 for (ALL_LIST_ELEMENTS_RO(pnc
->rp_list
, node
, rp_info
)) {
256 if (rp_info
->rp
.rpf_addr
.u
.prefix4
.s_addr
== INADDR_NONE
)
259 // Compute PIM RPF using cached nexthop
260 if (!pim_ecmp_nexthop_lookup(pim
, &rp_info
->rp
.source_nexthop
,
261 &rp_info
->rp
.rpf_addr
,
263 pim_rp_nexthop_del(rp_info
);
267 /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/
268 static int pim_update_upstream_nh_helper(struct hash_bucket
*bucket
, void *arg
)
270 struct pim_instance
*pim
= (struct pim_instance
*)arg
;
271 struct pim_upstream
*up
= (struct pim_upstream
*)bucket
->data
;
274 enum pim_rpf_result rpf_result
;
277 old
.source_nexthop
.interface
= up
->rpf
.source_nexthop
.interface
;
278 rpf_result
= pim_rpf_update(pim
, up
, &old
, 0);
279 if (rpf_result
== PIM_RPF_FAILURE
) {
280 pim_upstream_rpf_clear(pim
, up
);
281 return HASHWALK_CONTINUE
;
284 /* update kernel multicast forwarding cache (MFC) */
285 if (up
->rpf
.source_nexthop
.interface
) {
286 ifindex_t ifindex
= up
->rpf
.source_nexthop
.interface
->ifindex
;
288 vif_index
= pim_if_find_vifindex_by_ifindex(pim
, ifindex
);
289 /* Pass Current selected NH vif index to mroute download
292 pim_scan_individual_oil(up
->channel_oil
, vif_index
);
294 if (PIM_DEBUG_PIM_NHT
)
296 "%s: NHT upstream %s channel_oil IIF %s vif_index is not valid",
297 __PRETTY_FUNCTION__
, up
->sg_str
,
298 up
->rpf
.source_nexthop
.interface
->name
);
302 if (rpf_result
== PIM_RPF_CHANGED
)
303 pim_zebra_upstream_rpf_changed(pim
, up
, &old
);
306 if (PIM_DEBUG_PIM_NHT
) {
307 zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s",
308 __PRETTY_FUNCTION__
, up
->sg_str
, pim
->vrf
->name
,
309 old
.source_nexthop
.interface
310 ? old
.source_nexthop
.interface
->name
: "Unknwon",
311 up
->rpf
.source_nexthop
.interface
->name
);
314 return HASHWALK_CONTINUE
;
317 static int pim_update_upstream_nh(struct pim_instance
*pim
,
318 struct pim_nexthop_cache
*pnc
)
320 hash_walk(pnc
->upstream_hash
, pim_update_upstream_nh_helper
, pim
);
322 pim_zebra_update_all_interfaces(pim
);
327 uint32_t pim_compute_ecmp_hash(struct prefix
*src
, struct prefix
*grp
)
330 uint32_t s
= 0, g
= 0;
335 switch (src
->family
) {
337 s
= src
->u
.prefix4
.s_addr
;
340 g
= grp
->u
.prefix4
.s_addr
;
346 hash_val
= jhash_2words(g
, s
, 101);
350 static int pim_ecmp_nexthop_search(struct pim_instance
*pim
,
351 struct pim_nexthop_cache
*pnc
,
352 struct pim_nexthop
*nexthop
,
353 struct prefix
*src
, struct prefix
*grp
,
356 struct pim_neighbor
*nbrs
[MULTIPATH_NUM
], *nbr
= NULL
;
357 struct interface
*ifps
[MULTIPATH_NUM
];
358 struct nexthop
*nh_node
= NULL
;
359 ifindex_t first_ifindex
;
360 struct interface
*ifp
= NULL
;
361 uint32_t hash_val
= 0, mod_val
= 0;
362 uint8_t nh_iter
= 0, found
= 0;
363 uint32_t i
, num_nbrs
= 0;
365 if (!pnc
|| !pnc
->nexthop_num
|| !nexthop
)
368 memset(&nbrs
, 0, sizeof(nbrs
));
369 memset(&ifps
, 0, sizeof(ifps
));
371 // Current Nexthop is VALID, check to stay on the current path.
372 if (nexthop
->interface
&& nexthop
->interface
->info
373 && nexthop
->mrib_nexthop_addr
.u
.prefix4
.s_addr
374 != PIM_NET_INADDR_ANY
) {
375 /* User configured knob to explicitly switch
376 to new path is disabled or current path
377 metric is less than nexthop update.
380 if (pim
->ecmp_rebalance_enable
== 0) {
381 uint8_t curr_route_valid
= 0;
382 // Check if current nexthop is present in new updated
384 // If the current nexthop is not valid, candidate to
385 // choose new Nexthop.
386 for (nh_node
= pnc
->nexthop
; nh_node
;
387 nh_node
= nh_node
->next
) {
388 curr_route_valid
= (nexthop
->interface
->ifindex
389 == nh_node
->ifindex
);
390 if (curr_route_valid
)
395 && !pim_if_connected_to_source(nexthop
->interface
,
397 nbr
= pim_neighbor_find(
399 nexthop
->mrib_nexthop_addr
.u
.prefix4
);
401 && !if_is_loopback(nexthop
->interface
)) {
402 if (PIM_DEBUG_PIM_NHT
)
404 "%s: current nexthop does not have nbr ",
405 __PRETTY_FUNCTION__
);
407 if (PIM_DEBUG_PIM_NHT
) {
408 char src_str
[INET_ADDRSTRLEN
];
409 pim_inet4_dump("<addr?>",
413 char grp_str
[INET_ADDRSTRLEN
];
414 pim_inet4_dump("<addr?>",
419 "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection",
423 nexthop
->interface
->name
);
432 * Look up all interfaces and neighbors,
433 * store for later usage
435 for (nh_node
= pnc
->nexthop
, i
= 0; nh_node
;
436 nh_node
= nh_node
->next
, i
++) {
437 ifps
[i
] = if_lookup_by_index(nh_node
->ifindex
, pim
->vrf_id
);
439 nbrs
[i
] = pim_neighbor_find(ifps
[i
],
441 if (nbrs
[i
] || pim_if_connected_to_source(ifps
[i
],
447 if (pim
->ecmp_enable
) {
448 uint32_t consider
= pnc
->nexthop_num
;
450 if (neighbor_needed
&& num_nbrs
< consider
)
456 // PIM ECMP flag is enable then choose ECMP path.
457 hash_val
= pim_compute_ecmp_hash(src
, grp
);
458 mod_val
= hash_val
% consider
;
461 for (nh_node
= pnc
->nexthop
; nh_node
&& (found
== 0);
462 nh_node
= nh_node
->next
) {
463 first_ifindex
= nh_node
->ifindex
;
466 if (PIM_DEBUG_PIM_NHT
) {
467 char addr_str
[INET_ADDRSTRLEN
];
468 pim_inet4_dump("<addr?>", src
->u
.prefix4
,
469 addr_str
, sizeof(addr_str
));
471 "%s %s: could not find interface for ifindex %d (address %s(%s))",
472 __FILE__
, __PRETTY_FUNCTION__
,
473 first_ifindex
, addr_str
,
476 if (nh_iter
== mod_val
)
477 mod_val
++; // Select nexthpath
482 if (PIM_DEBUG_PIM_NHT
) {
483 char addr_str
[INET_ADDRSTRLEN
];
484 pim_inet4_dump("<addr?>", src
->u
.prefix4
,
485 addr_str
, sizeof(addr_str
));
487 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)",
488 __PRETTY_FUNCTION__
, ifp
->name
,
489 pim
->vrf
->name
, first_ifindex
,
492 if (nh_iter
== mod_val
)
493 mod_val
++; // Select nexthpath
499 && !pim_if_connected_to_source(ifp
, src
->u
.prefix4
)) {
501 if (!nbr
&& !if_is_loopback(ifp
)) {
502 if (PIM_DEBUG_PIM_NHT
)
504 "%s: pim nbr not found on input interface %s(%s)",
505 __PRETTY_FUNCTION__
, ifp
->name
,
507 if (nh_iter
== mod_val
)
508 mod_val
++; // Select nexthpath
514 if (nh_iter
== mod_val
) {
515 nexthop
->interface
= ifp
;
516 nexthop
->mrib_nexthop_addr
.family
= AF_INET
;
517 nexthop
->mrib_nexthop_addr
.prefixlen
= IPV4_MAX_BITLEN
;
518 nexthop
->mrib_nexthop_addr
.u
.prefix4
=
520 nexthop
->mrib_metric_preference
= pnc
->distance
;
521 nexthop
->mrib_route_metric
= pnc
->metric
;
522 nexthop
->last_lookup
= src
->u
.prefix4
;
523 nexthop
->last_lookup_time
= pim_time_monotonic_usec();
526 if (PIM_DEBUG_PIM_NHT
) {
527 char buf
[INET_ADDRSTRLEN
];
528 char buf2
[INET_ADDRSTRLEN
];
529 char buf3
[INET_ADDRSTRLEN
];
530 pim_inet4_dump("<src?>", src
->u
.prefix4
, buf2
,
532 pim_inet4_dump("<grp?>", grp
->u
.prefix4
, buf3
,
536 nexthop
->mrib_nexthop_addr
.u
.prefix4
,
539 "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d",
540 __PRETTY_FUNCTION__
, buf2
, buf3
,
541 pim
->vrf
->name
, ifp
->name
, buf
, mod_val
,
542 nh_iter
, pim
->ecmp_enable
);
554 /* This API is used to parse Registered address nexthop update coming from Zebra
556 int pim_parse_nexthop_update(ZAPI_CALLBACK_ARGS
)
558 struct nexthop
*nexthop
;
559 struct nexthop
*nhlist_head
= NULL
;
560 struct nexthop
*nhlist_tail
= NULL
;
563 struct pim_nexthop_cache
*pnc
= NULL
;
564 struct pim_neighbor
*nbr
= NULL
;
565 struct interface
*ifp
= NULL
;
566 struct interface
*ifp1
= NULL
;
567 struct vrf
*vrf
= vrf_lookup_by_id(vrf_id
);
568 struct pim_instance
*pim
;
569 struct zapi_route nhr
;
575 if (!zapi_nexthop_update_decode(zclient
->ibuf
, &nhr
)) {
576 if (PIM_DEBUG_PIM_NHT
)
578 "%s: Decode of nexthop update from zebra failed",
579 __PRETTY_FUNCTION__
);
583 if (cmd
== ZEBRA_NEXTHOP_UPDATE
) {
584 prefix_copy(&rpf
.rpf_addr
, &nhr
.prefix
);
585 pnc
= pim_nexthop_cache_find(pim
, &rpf
);
587 if (PIM_DEBUG_PIM_NHT
) {
588 char buf
[PREFIX2STR_BUFFER
];
589 prefix2str(&rpf
.rpf_addr
, buf
, sizeof(buf
));
591 "%s: Skipping NHT update, addr %s is not in local cached DB.",
592 __PRETTY_FUNCTION__
, buf
);
598 * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE
603 pnc
->last_update
= pim_time_monotonic_usec();
605 if (nhr
.nexthop_num
) {
606 pnc
->nexthop_num
= 0; // Only increment for pim enabled rpf.
608 for (i
= 0; i
< nhr
.nexthop_num
; i
++) {
609 nexthop
= nexthop_from_zapi_nexthop(&nhr
.nexthops
[i
]);
610 switch (nexthop
->type
) {
611 case NEXTHOP_TYPE_IPV4
:
612 case NEXTHOP_TYPE_IPV4_IFINDEX
:
613 case NEXTHOP_TYPE_IPV6
:
614 case NEXTHOP_TYPE_BLACKHOLE
:
616 case NEXTHOP_TYPE_IFINDEX
:
618 * Connected route (i.e. no nexthop), use
619 * RPF address from nexthop cache (i.e.
620 * destination) as PIM nexthop.
622 nexthop
->type
= NEXTHOP_TYPE_IPV4_IFINDEX
;
624 pnc
->rpf
.rpf_addr
.u
.prefix4
;
626 case NEXTHOP_TYPE_IPV6_IFINDEX
:
627 ifp1
= if_lookup_by_index(nexthop
->ifindex
,
629 nbr
= pim_neighbor_find_if(ifp1
);
630 /* Overwrite with Nbr address as NH addr */
632 nexthop
->gate
.ipv4
= nbr
->source_addr
;
634 // Mark nexthop address to 0 until PIM
636 nexthop
->gate
.ipv4
.s_addr
=
643 ifp
= if_lookup_by_index(nexthop
->ifindex
, pim
->vrf_id
);
645 if (PIM_DEBUG_PIM_NHT
) {
646 char buf
[NEXTHOP_STRLEN
];
648 "%s: could not find interface for ifindex %d(%s) (addr %s)",
652 nexthop2str(nexthop
, buf
,
655 nexthop_free(nexthop
);
659 if (PIM_DEBUG_PIM_NHT
) {
660 char p_str
[PREFIX2STR_BUFFER
];
662 prefix2str(&nhr
.prefix
, p_str
, sizeof(p_str
));
664 "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ",
665 __PRETTY_FUNCTION__
, p_str
,
666 pim
->vrf
->name
, i
+ 1,
667 inet_ntoa(nexthop
->gate
.ipv4
),
668 ifp
->name
, nexthop
->type
, nhr
.distance
,
673 if (PIM_DEBUG_PIM_NHT
) {
674 char buf
[NEXTHOP_STRLEN
];
677 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)",
678 __PRETTY_FUNCTION__
, ifp
->name
,
681 nexthop2str(nexthop
, buf
,
684 nexthop_free(nexthop
);
689 nhlist_tail
->next
= nexthop
;
690 nhlist_tail
= nexthop
;
692 nhlist_tail
= nexthop
;
693 nhlist_head
= nexthop
;
695 // Only keep track of nexthops which are PIM enabled.
698 /* Reset existing pnc->nexthop before assigning new list */
699 nexthops_free(pnc
->nexthop
);
700 pnc
->nexthop
= nhlist_head
;
701 if (pnc
->nexthop_num
) {
702 pnc
->flags
|= PIM_NEXTHOP_VALID
;
703 pnc
->distance
= nhr
.distance
;
704 pnc
->metric
= nhr
.metric
;
707 pnc
->flags
&= ~PIM_NEXTHOP_VALID
;
708 pnc
->nexthop_num
= nhr
.nexthop_num
;
709 nexthops_free(pnc
->nexthop
);
712 SET_FLAG(pnc
->flags
, PIM_NEXTHOP_ANSWER_RECEIVED
);
714 if (PIM_DEBUG_PIM_NHT
) {
715 char buf
[PREFIX2STR_BUFFER
];
716 prefix2str(&nhr
.prefix
, buf
, sizeof(buf
));
718 "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d",
719 __PRETTY_FUNCTION__
, buf
, pim
->vrf
->name
,
720 nhr
.nexthop_num
, pnc
->nexthop_num
, vrf_id
,
721 pnc
->upstream_hash
->count
, listcount(pnc
->rp_list
));
724 pim_rpf_set_refresh_time(pim
);
726 if (listcount(pnc
->rp_list
))
727 pim_update_rp_nh(pim
, pnc
);
728 if (pnc
->upstream_hash
->count
)
729 pim_update_upstream_nh(pim
, pnc
);
734 int pim_ecmp_nexthop_lookup(struct pim_instance
*pim
,
735 struct pim_nexthop
*nexthop
, struct prefix
*src
,
736 struct prefix
*grp
, int neighbor_needed
)
738 struct pim_nexthop_cache
*pnc
;
739 struct pim_zlookup_nexthop nexthop_tab
[MULTIPATH_NUM
];
740 struct pim_neighbor
*nbrs
[MULTIPATH_NUM
], *nbr
= NULL
;
743 struct interface
*ifps
[MULTIPATH_NUM
], *ifp
;
747 uint32_t hash_val
= 0, mod_val
= 0;
748 uint32_t num_nbrs
= 0;
749 char addr_str
[PREFIX_STRLEN
];
751 if (PIM_DEBUG_PIM_NHT
) {
752 pim_inet4_dump("<addr?>", src
->u
.prefix4
, addr_str
,
754 zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld",
755 __PRETTY_FUNCTION__
, addr_str
, pim
->vrf
->name
,
756 nexthop
->last_lookup_time
);
759 memset(&rpf
, 0, sizeof(struct pim_rpf
));
760 rpf
.rpf_addr
.family
= AF_INET
;
761 rpf
.rpf_addr
.prefixlen
= IPV4_MAX_BITLEN
;
762 rpf
.rpf_addr
.u
.prefix4
= src
->u
.prefix4
;
764 pnc
= pim_nexthop_cache_find(pim
, &rpf
);
766 if (CHECK_FLAG(pnc
->flags
, PIM_NEXTHOP_ANSWER_RECEIVED
))
767 return pim_ecmp_nexthop_search(pim
, pnc
, nexthop
, src
, grp
,
771 memset(nexthop_tab
, 0,
772 sizeof(struct pim_zlookup_nexthop
) * MULTIPATH_NUM
);
774 zclient_lookup_nexthop(pim
, nexthop_tab
, MULTIPATH_NUM
,
775 src
->u
.prefix4
, PIM_NEXTHOP_LOOKUP_MAX
);
776 if (num_ifindex
< 1) {
777 if (PIM_DEBUG_PIM_NHT
)
779 "%s: could not find nexthop ifindex for address %s(%s)",
780 __PRETTY_FUNCTION__
, addr_str
, pim
->vrf
->name
);
784 memset(&nbrs
, 0, sizeof(nbrs
));
785 memset(&ifps
, 0, sizeof(ifps
));
788 * Look up all interfaces and neighbors,
789 * store for later usage
791 for (i
= 0; i
< num_ifindex
; i
++) {
792 ifps
[i
] = if_lookup_by_index(nexthop_tab
[i
].ifindex
,
795 nbrs
[i
] = pim_neighbor_find(
796 ifps
[i
], nexthop_tab
[i
].nexthop_addr
.u
.prefix4
);
798 || pim_if_connected_to_source(ifps
[i
],
804 // If PIM ECMP enable then choose ECMP path.
805 if (pim
->ecmp_enable
) {
806 uint32_t consider
= num_ifindex
;
808 if (neighbor_needed
&& num_nbrs
< consider
)
814 hash_val
= pim_compute_ecmp_hash(src
, grp
);
815 mod_val
= hash_val
% consider
;
816 if (PIM_DEBUG_PIM_NHT_DETAIL
)
817 zlog_debug("%s: hash_val %u mod_val %u",
818 __PRETTY_FUNCTION__
, hash_val
, mod_val
);
822 while (!found
&& (i
< num_ifindex
)) {
823 first_ifindex
= nexthop_tab
[i
].ifindex
;
827 if (PIM_DEBUG_PIM_NHT
)
829 "%s %s: could not find interface for ifindex %d (address %s(%s))",
830 __FILE__
, __PRETTY_FUNCTION__
,
831 first_ifindex
, addr_str
,
840 if (PIM_DEBUG_PIM_NHT
)
842 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)",
843 __PRETTY_FUNCTION__
, ifp
->name
,
844 pim
->vrf
->name
, first_ifindex
,
852 && !pim_if_connected_to_source(ifp
, src
->u
.prefix4
)) {
854 if (PIM_DEBUG_PIM_NHT_DETAIL
)
855 zlog_debug("ifp name: %s(%s), pim nbr: %p",
856 ifp
->name
, pim
->vrf
->name
, nbr
);
857 if (!nbr
&& !if_is_loopback(ifp
)) {
861 if (PIM_DEBUG_PIM_NHT
)
863 "%s: NBR not found on input interface %s(%s) (RPF for source %s)",
864 __PRETTY_FUNCTION__
, ifp
->name
,
865 pim
->vrf
->name
, addr_str
);
871 if (PIM_DEBUG_PIM_NHT
) {
872 char nexthop_str
[PREFIX_STRLEN
];
874 pim_addr_dump("<nexthop?>",
875 &nexthop_tab
[i
].nexthop_addr
,
876 nexthop_str
, sizeof(nexthop_str
));
878 "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d",
879 __PRETTY_FUNCTION__
, nexthop_str
,
880 addr_str
, ifp
->name
, pim
->vrf
->name
,
881 nexthop_tab
[i
].route_metric
,
882 nexthop_tab
[i
].protocol_distance
);
884 /* update nexthop data */
885 nexthop
->interface
= ifp
;
886 nexthop
->mrib_nexthop_addr
=
887 nexthop_tab
[i
].nexthop_addr
;
888 nexthop
->mrib_metric_preference
=
889 nexthop_tab
[i
].protocol_distance
;
890 nexthop
->mrib_route_metric
=
891 nexthop_tab
[i
].route_metric
;
892 nexthop
->last_lookup
= src
->u
.prefix4
;
893 nexthop
->last_lookup_time
= pim_time_monotonic_usec();
906 int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance
*pim
,
907 struct prefix
*src
, struct prefix
*grp
)
909 struct pim_nexthop nhop
;
912 char addr_str
[PREFIX_STRLEN
];
914 if (PIM_DEBUG_PIM_NHT
)
915 pim_inet4_dump("<addr?>", src
->u
.prefix4
, addr_str
,
918 memset(&nhop
, 0, sizeof(nhop
));
919 if (!pim_ecmp_nexthop_lookup(pim
, &nhop
, src
, grp
, 0)) {
920 if (PIM_DEBUG_PIM_NHT
)
922 "%s: could not find nexthop ifindex for address %s(%s)",
923 __PRETTY_FUNCTION__
, addr_str
, pim
->vrf
->name
);
927 ifindex
= nhop
.interface
->ifindex
;
928 if (PIM_DEBUG_PIM_NHT
)
930 "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s",
931 __PRETTY_FUNCTION__
, ifindex
,
932 ifindex2ifname(ifindex
, pim
->vrf_id
),
933 pim
->vrf
->name
, addr_str
);
935 vif_index
= pim_if_find_vifindex_by_ifindex(pim
, ifindex
);
938 if (PIM_DEBUG_PIM_NHT
) {
940 "%s: low vif_index=%d(%s) < 1 nexthop for address %s",
941 __PRETTY_FUNCTION__
, vif_index
, pim
->vrf
->name
,