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 bool bsr_track_needed
,
125 struct pim_nexthop_cache
*out_pnc
)
127 struct pim_nexthop_cache
*pnc
= NULL
;
129 struct listnode
*ch_node
= NULL
;
130 struct zclient
*zclient
= NULL
;
132 zclient
= pim_zebra_zclient_get();
133 memset(&rpf
, 0, sizeof(struct pim_rpf
));
134 rpf
.rpf_addr
.family
= addr
->family
;
135 rpf
.rpf_addr
.prefixlen
= addr
->prefixlen
;
136 rpf
.rpf_addr
.u
.prefix4
= addr
->u
.prefix4
;
138 pnc
= pim_nexthop_cache_find(pim
, &rpf
);
140 pnc
= pim_nexthop_cache_add(pim
, &rpf
);
141 pim_sendmsg_zebra_rnh(pim
, zclient
, pnc
,
142 ZEBRA_NEXTHOP_REGISTER
);
143 if (PIM_DEBUG_PIM_NHT
) {
144 char buf
[PREFIX2STR_BUFFER
];
145 prefix2str(addr
, buf
, sizeof(buf
));
147 "%s: NHT cache and zebra notification added for %s(%s)",
148 __PRETTY_FUNCTION__
, buf
, pim
->vrf
->name
);
153 ch_node
= listnode_lookup(pnc
->rp_list
, rp
);
155 listnode_add_sort(pnc
->rp_list
, rp
);
159 hash_get(pnc
->upstream_hash
, up
, hash_alloc_intern
);
161 if (bsr_track_needed
)
162 pnc
->bsr_tracking
= true;
164 if (CHECK_FLAG(pnc
->flags
, PIM_NEXTHOP_VALID
)) {
166 memcpy(out_pnc
, pnc
, sizeof(struct pim_nexthop_cache
));
173 void pim_delete_tracked_nexthop(struct pim_instance
*pim
, struct prefix
*addr
,
174 struct pim_upstream
*up
, struct rp_info
*rp
,
175 bool del_bsr_tracking
)
177 struct pim_nexthop_cache
*pnc
= NULL
;
178 struct pim_nexthop_cache lookup
;
179 struct zclient
*zclient
= NULL
;
180 struct pim_upstream
*upstream
= NULL
;
182 zclient
= pim_zebra_zclient_get();
184 /* Remove from RPF hash if it is the last entry */
185 lookup
.rpf
.rpf_addr
= *addr
;
186 pnc
= hash_lookup(pim
->rpf_hash
, &lookup
);
189 /* Release the (*, G)upstream from pnc->upstream_hash,
190 * whose Group belongs to the RP getting deleted
192 frr_each (rb_pim_upstream
, &pim
->upstream_head
,
195 struct rp_info
*trp_info
;
197 if (upstream
->sg
.src
.s_addr
!= INADDR_ANY
)
200 grp
.family
= AF_INET
;
201 grp
.prefixlen
= IPV4_MAX_BITLEN
;
202 grp
.u
.prefix4
= upstream
->sg
.grp
;
204 trp_info
= pim_rp_find_match_group(pim
, &grp
);
206 hash_release(pnc
->upstream_hash
,
209 listnode_delete(pnc
->rp_list
, rp
);
213 hash_release(pnc
->upstream_hash
, up
);
215 if (del_bsr_tracking
)
216 pnc
->bsr_tracking
= false;
218 if (PIM_DEBUG_PIM_NHT
) {
219 char buf
[PREFIX_STRLEN
];
220 prefix2str(addr
, buf
, sizeof buf
);
222 "%s: NHT %s(%s) rp_list count:%d upstream count:%ld",
223 __PRETTY_FUNCTION__
, buf
, pim
->vrf
->name
,
224 pnc
->rp_list
->count
, pnc
->upstream_hash
->count
);
227 if (pnc
->rp_list
->count
== 0
228 && pnc
->upstream_hash
->count
== 0
229 && pnc
->bsr_tracking
== false) {
230 pim_sendmsg_zebra_rnh(pim
, zclient
, pnc
,
231 ZEBRA_NEXTHOP_UNREGISTER
);
233 list_delete(&pnc
->rp_list
);
234 hash_free(pnc
->upstream_hash
);
236 hash_release(pim
->rpf_hash
, pnc
);
238 nexthops_free(pnc
->nexthop
);
239 XFREE(MTYPE_PIM_NEXTHOP_CACHE
, pnc
);
244 /* Given a source address and a neighbor address, check if the neighbor is one
245 * of the next hop to reach the source. search from zebra route database
247 bool pim_nexthop_match(struct pim_instance
*pim
, struct in_addr addr
,
248 struct in_addr ip_src
)
250 struct pim_zlookup_nexthop nexthop_tab
[MULTIPATH_NUM
];
252 ifindex_t first_ifindex
= 0;
253 struct interface
*ifp
= NULL
;
254 struct pim_neighbor
*nbr
= NULL
;
257 if (addr
.s_addr
== INADDR_NONE
)
260 memset(nexthop_tab
, 0,
261 sizeof(struct pim_zlookup_nexthop
) * MULTIPATH_NUM
);
262 num_ifindex
= zclient_lookup_nexthop(pim
, nexthop_tab
, MULTIPATH_NUM
,
263 addr
, PIM_NEXTHOP_LOOKUP_MAX
);
264 if (num_ifindex
< 1) {
265 char addr_str
[INET_ADDRSTRLEN
];
267 pim_inet4_dump("<addr?>", addr
, addr_str
, sizeof(addr_str
));
269 "%s %s: could not find nexthop ifindex for address %s",
270 __FILE__
, __PRETTY_FUNCTION__
, addr_str
);
274 while (i
< num_ifindex
) {
275 first_ifindex
= nexthop_tab
[i
].ifindex
;
277 ifp
= if_lookup_by_index(first_ifindex
, pim
->vrf_id
);
279 if (PIM_DEBUG_ZEBRA
) {
280 char addr_str
[INET_ADDRSTRLEN
];
282 pim_inet4_dump("<addr?>", addr
, addr_str
,
285 "%s %s: could not find interface for ifindex %d (address %s)",
286 __FILE__
, __PRETTY_FUNCTION__
,
287 first_ifindex
, addr_str
);
294 if (PIM_DEBUG_ZEBRA
) {
295 char addr_str
[INET_ADDRSTRLEN
];
297 pim_inet4_dump("<addr?>", addr
, addr_str
,
300 "%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)",
301 __PRETTY_FUNCTION__
, ifp
->name
,
302 first_ifindex
, addr_str
);
308 if (!pim_if_connected_to_source(ifp
, addr
)) {
309 nbr
= pim_neighbor_find(
310 ifp
, nexthop_tab
[i
].nexthop_addr
.u
.prefix4
);
311 if (PIM_DEBUG_PIM_TRACE_DETAIL
)
312 zlog_debug("ifp name: %s, pim nbr: %p",
314 if (!nbr
&& !if_is_loopback(ifp
)) {
320 if (nexthop_tab
[i
].nexthop_addr
.u
.prefix4
.s_addr
330 /* Given a source address and a neighbor address, check if the neighbor is one
331 * of the next hop to reach the source. search from pim next hop cache
333 bool pim_nexthop_match_nht_cache(struct pim_instance
*pim
, struct in_addr addr
,
334 struct in_addr ip_src
)
337 ifindex_t first_ifindex
;
338 struct interface
*ifp
= NULL
;
340 struct pim_neighbor
*nbr
= NULL
;
341 struct nexthop
*nh_node
= NULL
;
342 struct pim_nexthop_cache
*pnc
= NULL
;
344 memset(&rpf
, 0, sizeof(struct pim_rpf
));
345 rpf
.rpf_addr
.family
= AF_INET
;
346 rpf
.rpf_addr
.prefixlen
= IPV4_MAX_BITLEN
;
347 rpf
.rpf_addr
.u
.prefix4
= addr
;
349 pnc
= pim_nexthop_cache_find(pim
, &rpf
);
350 if (!pnc
|| !pnc
->nexthop_num
)
353 for (nh_node
= pnc
->nexthop
; nh_node
; nh_node
= nh_node
->next
) {
354 first_ifindex
= nh_node
->ifindex
;
355 ifp
= if_lookup_by_index(first_ifindex
, pim
->vrf_id
);
357 if (PIM_DEBUG_PIM_NHT
) {
358 char addr_str
[INET_ADDRSTRLEN
];
360 pim_inet4_dump("<addr?>", addr
, addr_str
,
363 "%s %s: could not find interface for ifindex %d (address %s(%s))",
364 __FILE__
, __PRETTY_FUNCTION__
,
365 first_ifindex
, addr_str
,
372 if (PIM_DEBUG_PIM_NHT
) {
373 char addr_str
[INET_ADDRSTRLEN
];
375 pim_inet4_dump("<addr?>", addr
, addr_str
,
378 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)",
379 __PRETTY_FUNCTION__
, ifp
->name
,
380 pim
->vrf
->name
, first_ifindex
,
387 if (!pim_if_connected_to_source(ifp
, addr
)) {
388 nbr
= pim_neighbor_find(ifp
, nh_node
->gate
.ipv4
);
389 if (!nbr
&& !if_is_loopback(ifp
)) {
390 if (PIM_DEBUG_PIM_NHT
)
392 "%s: pim nbr not found on input interface %s(%s)",
393 __PRETTY_FUNCTION__
, ifp
->name
,
400 if (nh_node
->gate
.ipv4
.s_addr
== ip_src
.s_addr
)
407 void pim_rp_nexthop_del(struct rp_info
*rp_info
)
409 rp_info
->rp
.source_nexthop
.interface
= NULL
;
410 rp_info
->rp
.source_nexthop
.mrib_nexthop_addr
.u
.prefix4
.s_addr
=
412 rp_info
->rp
.source_nexthop
.mrib_metric_preference
=
413 router
->infinite_assert_metric
.metric_preference
;
414 rp_info
->rp
.source_nexthop
.mrib_route_metric
=
415 router
->infinite_assert_metric
.route_metric
;
418 /* Update RP nexthop info based on Nexthop update received from Zebra.*/
419 static void pim_update_rp_nh(struct pim_instance
*pim
,
420 struct pim_nexthop_cache
*pnc
)
422 struct listnode
*node
= NULL
;
423 struct rp_info
*rp_info
= NULL
;
425 /*Traverse RP list and update each RP Nexthop info */
426 for (ALL_LIST_ELEMENTS_RO(pnc
->rp_list
, node
, rp_info
)) {
427 if (rp_info
->rp
.rpf_addr
.u
.prefix4
.s_addr
== INADDR_NONE
)
430 // Compute PIM RPF using cached nexthop
431 if (!pim_ecmp_nexthop_lookup(pim
, &rp_info
->rp
.source_nexthop
,
432 &rp_info
->rp
.rpf_addr
,
434 pim_rp_nexthop_del(rp_info
);
438 /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/
439 static int pim_update_upstream_nh_helper(struct hash_bucket
*bucket
, void *arg
)
441 struct pim_instance
*pim
= (struct pim_instance
*)arg
;
442 struct pim_upstream
*up
= (struct pim_upstream
*)bucket
->data
;
444 enum pim_rpf_result rpf_result
;
447 old
.source_nexthop
.interface
= up
->rpf
.source_nexthop
.interface
;
448 rpf_result
= pim_rpf_update(pim
, up
, &old
, __func__
);
450 /* update kernel multicast forwarding cache (MFC); if the
451 * RPF nbr is now unreachable the MFC has already been updated
454 if (rpf_result
!= PIM_RPF_FAILURE
)
455 pim_upstream_mroute_iif_update(up
->channel_oil
, __func__
);
457 if (rpf_result
== PIM_RPF_CHANGED
||
458 (rpf_result
== PIM_RPF_FAILURE
&& old
.source_nexthop
.interface
))
459 pim_zebra_upstream_rpf_changed(pim
, up
, &old
);
462 if (PIM_DEBUG_PIM_NHT
) {
463 zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s",
464 __PRETTY_FUNCTION__
, up
->sg_str
, pim
->vrf
->name
,
465 old
.source_nexthop
.interface
466 ? old
.source_nexthop
.interface
->name
: "Unknown",
467 up
->rpf
.source_nexthop
.interface
468 ? up
->rpf
.source_nexthop
.interface
->name
: "Unknown");
471 return HASHWALK_CONTINUE
;
474 static int pim_update_upstream_nh(struct pim_instance
*pim
,
475 struct pim_nexthop_cache
*pnc
)
477 hash_walk(pnc
->upstream_hash
, pim_update_upstream_nh_helper
, pim
);
479 pim_zebra_update_all_interfaces(pim
);
484 uint32_t pim_compute_ecmp_hash(struct prefix
*src
, struct prefix
*grp
)
487 uint32_t s
= 0, g
= 0;
492 switch (src
->family
) {
494 s
= src
->u
.prefix4
.s_addr
;
497 g
= grp
->u
.prefix4
.s_addr
;
503 hash_val
= jhash_2words(g
, s
, 101);
507 static int pim_ecmp_nexthop_search(struct pim_instance
*pim
,
508 struct pim_nexthop_cache
*pnc
,
509 struct pim_nexthop
*nexthop
,
510 struct prefix
*src
, struct prefix
*grp
,
513 struct pim_neighbor
*nbrs
[MULTIPATH_NUM
], *nbr
= NULL
;
514 struct interface
*ifps
[MULTIPATH_NUM
];
515 struct nexthop
*nh_node
= NULL
;
516 ifindex_t first_ifindex
;
517 struct interface
*ifp
= NULL
;
518 uint32_t hash_val
= 0, mod_val
= 0;
519 uint8_t nh_iter
= 0, found
= 0;
520 uint32_t i
, num_nbrs
= 0;
522 if (!pnc
|| !pnc
->nexthop_num
|| !nexthop
)
525 memset(&nbrs
, 0, sizeof(nbrs
));
526 memset(&ifps
, 0, sizeof(ifps
));
528 // Current Nexthop is VALID, check to stay on the current path.
529 if (nexthop
->interface
&& nexthop
->interface
->info
530 && nexthop
->mrib_nexthop_addr
.u
.prefix4
.s_addr
531 != PIM_NET_INADDR_ANY
) {
532 /* User configured knob to explicitly switch
533 to new path is disabled or current path
534 metric is less than nexthop update.
537 if (pim
->ecmp_rebalance_enable
== 0) {
538 uint8_t curr_route_valid
= 0;
539 // Check if current nexthop is present in new updated
541 // If the current nexthop is not valid, candidate to
542 // choose new Nexthop.
543 for (nh_node
= pnc
->nexthop
; nh_node
;
544 nh_node
= nh_node
->next
) {
545 curr_route_valid
= (nexthop
->interface
->ifindex
546 == nh_node
->ifindex
);
547 if (curr_route_valid
)
552 && !pim_if_connected_to_source(nexthop
->interface
,
554 nbr
= pim_neighbor_find(
556 nexthop
->mrib_nexthop_addr
.u
.prefix4
);
558 && !if_is_loopback(nexthop
->interface
)) {
559 if (PIM_DEBUG_PIM_NHT
)
561 "%s: current nexthop does not have nbr ",
562 __PRETTY_FUNCTION__
);
564 if (PIM_DEBUG_PIM_NHT
) {
565 char src_str
[INET_ADDRSTRLEN
];
566 pim_inet4_dump("<addr?>",
570 char grp_str
[INET_ADDRSTRLEN
];
571 pim_inet4_dump("<addr?>",
576 "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection",
580 nexthop
->interface
->name
);
589 * Look up all interfaces and neighbors,
590 * store for later usage
592 for (nh_node
= pnc
->nexthop
, i
= 0; nh_node
;
593 nh_node
= nh_node
->next
, i
++) {
594 ifps
[i
] = if_lookup_by_index(nh_node
->ifindex
, pim
->vrf_id
);
596 nbrs
[i
] = pim_neighbor_find(ifps
[i
],
598 if (nbrs
[i
] || pim_if_connected_to_source(ifps
[i
],
604 if (pim
->ecmp_enable
) {
605 uint32_t consider
= pnc
->nexthop_num
;
607 if (neighbor_needed
&& num_nbrs
< consider
)
613 // PIM ECMP flag is enable then choose ECMP path.
614 hash_val
= pim_compute_ecmp_hash(src
, grp
);
615 mod_val
= hash_val
% consider
;
618 for (nh_node
= pnc
->nexthop
; nh_node
&& (found
== 0);
619 nh_node
= nh_node
->next
) {
620 first_ifindex
= nh_node
->ifindex
;
623 if (PIM_DEBUG_PIM_NHT
) {
624 char addr_str
[INET_ADDRSTRLEN
];
625 pim_inet4_dump("<addr?>", src
->u
.prefix4
,
626 addr_str
, sizeof(addr_str
));
628 "%s %s: could not find interface for ifindex %d (address %s(%s))",
629 __FILE__
, __PRETTY_FUNCTION__
,
630 first_ifindex
, addr_str
,
633 if (nh_iter
== mod_val
)
634 mod_val
++; // Select nexthpath
639 if (PIM_DEBUG_PIM_NHT
) {
640 char addr_str
[INET_ADDRSTRLEN
];
641 pim_inet4_dump("<addr?>", src
->u
.prefix4
,
642 addr_str
, sizeof(addr_str
));
644 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)",
645 __PRETTY_FUNCTION__
, ifp
->name
,
646 pim
->vrf
->name
, first_ifindex
,
649 if (nh_iter
== mod_val
)
650 mod_val
++; // Select nexthpath
656 && !pim_if_connected_to_source(ifp
, src
->u
.prefix4
)) {
658 if (!nbr
&& !if_is_loopback(ifp
)) {
659 if (PIM_DEBUG_PIM_NHT
)
661 "%s: pim nbr not found on input interface %s(%s)",
662 __PRETTY_FUNCTION__
, ifp
->name
,
664 if (nh_iter
== mod_val
)
665 mod_val
++; // Select nexthpath
671 if (nh_iter
== mod_val
) {
672 nexthop
->interface
= ifp
;
673 nexthop
->mrib_nexthop_addr
.family
= AF_INET
;
674 nexthop
->mrib_nexthop_addr
.prefixlen
= IPV4_MAX_BITLEN
;
675 nexthop
->mrib_nexthop_addr
.u
.prefix4
=
677 nexthop
->mrib_metric_preference
= pnc
->distance
;
678 nexthop
->mrib_route_metric
= pnc
->metric
;
679 nexthop
->last_lookup
= src
->u
.prefix4
;
680 nexthop
->last_lookup_time
= pim_time_monotonic_usec();
683 if (PIM_DEBUG_PIM_NHT
) {
684 char buf
[INET_ADDRSTRLEN
];
685 char buf2
[INET_ADDRSTRLEN
];
686 char buf3
[INET_ADDRSTRLEN
];
687 pim_inet4_dump("<src?>", src
->u
.prefix4
, buf2
,
689 pim_inet4_dump("<grp?>", grp
->u
.prefix4
, buf3
,
693 nexthop
->mrib_nexthop_addr
.u
.prefix4
,
696 "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d",
697 __PRETTY_FUNCTION__
, buf2
, buf3
,
698 pim
->vrf
->name
, ifp
->name
, buf
, mod_val
,
699 nh_iter
, pim
->ecmp_enable
);
711 /* This API is used to parse Registered address nexthop update coming from Zebra
713 int pim_parse_nexthop_update(ZAPI_CALLBACK_ARGS
)
715 struct nexthop
*nexthop
;
716 struct nexthop
*nhlist_head
= NULL
;
717 struct nexthop
*nhlist_tail
= NULL
;
720 struct pim_nexthop_cache
*pnc
= NULL
;
721 struct pim_neighbor
*nbr
= NULL
;
722 struct interface
*ifp
= NULL
;
723 struct interface
*ifp1
= NULL
;
724 struct vrf
*vrf
= vrf_lookup_by_id(vrf_id
);
725 struct pim_instance
*pim
;
726 struct zapi_route nhr
;
732 if (!zapi_nexthop_update_decode(zclient
->ibuf
, &nhr
)) {
733 if (PIM_DEBUG_PIM_NHT
)
735 "%s: Decode of nexthop update from zebra failed",
736 __PRETTY_FUNCTION__
);
740 if (cmd
== ZEBRA_NEXTHOP_UPDATE
) {
741 prefix_copy(&rpf
.rpf_addr
, &nhr
.prefix
);
742 pnc
= pim_nexthop_cache_find(pim
, &rpf
);
744 if (PIM_DEBUG_PIM_NHT
) {
745 char buf
[PREFIX2STR_BUFFER
];
746 prefix2str(&rpf
.rpf_addr
, buf
, sizeof(buf
));
748 "%s: Skipping NHT update, addr %s is not in local cached DB.",
749 __PRETTY_FUNCTION__
, buf
);
755 * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE
760 pnc
->last_update
= pim_time_monotonic_usec();
762 if (nhr
.nexthop_num
) {
763 pnc
->nexthop_num
= 0; // Only increment for pim enabled rpf.
765 for (i
= 0; i
< nhr
.nexthop_num
; i
++) {
766 nexthop
= nexthop_from_zapi_nexthop(&nhr
.nexthops
[i
]);
767 switch (nexthop
->type
) {
768 case NEXTHOP_TYPE_IPV4
:
769 case NEXTHOP_TYPE_IPV4_IFINDEX
:
770 case NEXTHOP_TYPE_IPV6
:
771 case NEXTHOP_TYPE_BLACKHOLE
:
773 case NEXTHOP_TYPE_IFINDEX
:
775 * Connected route (i.e. no nexthop), use
776 * RPF address from nexthop cache (i.e.
777 * destination) as PIM nexthop.
779 nexthop
->type
= NEXTHOP_TYPE_IPV4_IFINDEX
;
781 pnc
->rpf
.rpf_addr
.u
.prefix4
;
783 case NEXTHOP_TYPE_IPV6_IFINDEX
:
784 ifp1
= if_lookup_by_index(nexthop
->ifindex
,
786 nbr
= pim_neighbor_find_if(ifp1
);
787 /* Overwrite with Nbr address as NH addr */
789 nexthop
->gate
.ipv4
= nbr
->source_addr
;
791 // Mark nexthop address to 0 until PIM
793 nexthop
->gate
.ipv4
.s_addr
=
800 ifp
= if_lookup_by_index(nexthop
->ifindex
, pim
->vrf_id
);
802 if (PIM_DEBUG_PIM_NHT
) {
803 char buf
[NEXTHOP_STRLEN
];
805 "%s: could not find interface for ifindex %d(%s) (addr %s)",
809 nexthop2str(nexthop
, buf
,
812 nexthop_free(nexthop
);
816 if (PIM_DEBUG_PIM_NHT
) {
817 char p_str
[PREFIX2STR_BUFFER
];
819 prefix2str(&nhr
.prefix
, p_str
, sizeof(p_str
));
821 "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ",
822 __PRETTY_FUNCTION__
, p_str
,
823 pim
->vrf
->name
, i
+ 1,
824 inet_ntoa(nexthop
->gate
.ipv4
),
825 ifp
->name
, nexthop
->type
, nhr
.distance
,
831 * Though Multicast is not enabled on this
832 * Interface store it in database otheriwse we
833 * may miss this update and this will not cause
834 * any issue, because while choosing the path we
835 * are ommitting the Interfaces which are not
838 if (PIM_DEBUG_PIM_NHT
) {
839 char buf
[NEXTHOP_STRLEN
];
842 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)",
843 __PRETTY_FUNCTION__
, ifp
->name
,
846 nexthop2str(nexthop
, buf
,
852 nhlist_tail
->next
= nexthop
;
853 nhlist_tail
= nexthop
;
855 nhlist_tail
= nexthop
;
856 nhlist_head
= nexthop
;
858 // Only keep track of nexthops which are PIM enabled.
861 /* Reset existing pnc->nexthop before assigning new list */
862 nexthops_free(pnc
->nexthop
);
863 pnc
->nexthop
= nhlist_head
;
864 if (pnc
->nexthop_num
) {
865 pnc
->flags
|= PIM_NEXTHOP_VALID
;
866 pnc
->distance
= nhr
.distance
;
867 pnc
->metric
= nhr
.metric
;
870 pnc
->flags
&= ~PIM_NEXTHOP_VALID
;
871 pnc
->nexthop_num
= nhr
.nexthop_num
;
872 nexthops_free(pnc
->nexthop
);
875 SET_FLAG(pnc
->flags
, PIM_NEXTHOP_ANSWER_RECEIVED
);
877 if (PIM_DEBUG_PIM_NHT
) {
878 char buf
[PREFIX2STR_BUFFER
];
879 prefix2str(&nhr
.prefix
, buf
, sizeof(buf
));
881 "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d",
882 __PRETTY_FUNCTION__
, buf
, pim
->vrf
->name
,
883 nhr
.nexthop_num
, pnc
->nexthop_num
, vrf_id
,
884 pnc
->upstream_hash
->count
, listcount(pnc
->rp_list
));
887 pim_rpf_set_refresh_time(pim
);
889 if (listcount(pnc
->rp_list
))
890 pim_update_rp_nh(pim
, pnc
);
891 if (pnc
->upstream_hash
->count
)
892 pim_update_upstream_nh(pim
, pnc
);
897 int pim_ecmp_nexthop_lookup(struct pim_instance
*pim
,
898 struct pim_nexthop
*nexthop
, struct prefix
*src
,
899 struct prefix
*grp
, int neighbor_needed
)
901 struct pim_nexthop_cache
*pnc
;
902 struct pim_zlookup_nexthop nexthop_tab
[MULTIPATH_NUM
];
903 struct pim_neighbor
*nbrs
[MULTIPATH_NUM
], *nbr
= NULL
;
906 struct interface
*ifps
[MULTIPATH_NUM
], *ifp
;
910 uint32_t hash_val
= 0, mod_val
= 0;
911 uint32_t num_nbrs
= 0;
912 char addr_str
[PREFIX_STRLEN
];
914 if (PIM_DEBUG_PIM_NHT
) {
915 pim_inet4_dump("<addr?>", src
->u
.prefix4
, addr_str
,
917 zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld",
918 __PRETTY_FUNCTION__
, addr_str
, pim
->vrf
->name
,
919 nexthop
->last_lookup_time
);
922 memset(&rpf
, 0, sizeof(struct pim_rpf
));
923 rpf
.rpf_addr
.family
= AF_INET
;
924 rpf
.rpf_addr
.prefixlen
= IPV4_MAX_BITLEN
;
925 rpf
.rpf_addr
.u
.prefix4
= src
->u
.prefix4
;
927 pnc
= pim_nexthop_cache_find(pim
, &rpf
);
929 if (CHECK_FLAG(pnc
->flags
, PIM_NEXTHOP_ANSWER_RECEIVED
))
930 return pim_ecmp_nexthop_search(pim
, pnc
, nexthop
, src
, grp
,
934 memset(nexthop_tab
, 0,
935 sizeof(struct pim_zlookup_nexthop
) * MULTIPATH_NUM
);
937 zclient_lookup_nexthop(pim
, nexthop_tab
, MULTIPATH_NUM
,
938 src
->u
.prefix4
, PIM_NEXTHOP_LOOKUP_MAX
);
939 if (num_ifindex
< 1) {
940 if (PIM_DEBUG_PIM_NHT
)
942 "%s: could not find nexthop ifindex for address %s(%s)",
943 __PRETTY_FUNCTION__
, addr_str
, pim
->vrf
->name
);
947 memset(&nbrs
, 0, sizeof(nbrs
));
948 memset(&ifps
, 0, sizeof(ifps
));
951 * Look up all interfaces and neighbors,
952 * store for later usage
954 for (i
= 0; i
< num_ifindex
; i
++) {
955 ifps
[i
] = if_lookup_by_index(nexthop_tab
[i
].ifindex
,
958 nbrs
[i
] = pim_neighbor_find(
959 ifps
[i
], nexthop_tab
[i
].nexthop_addr
.u
.prefix4
);
961 || pim_if_connected_to_source(ifps
[i
],
967 // If PIM ECMP enable then choose ECMP path.
968 if (pim
->ecmp_enable
) {
969 uint32_t consider
= num_ifindex
;
971 if (neighbor_needed
&& num_nbrs
< consider
)
977 hash_val
= pim_compute_ecmp_hash(src
, grp
);
978 mod_val
= hash_val
% consider
;
979 if (PIM_DEBUG_PIM_NHT_DETAIL
)
980 zlog_debug("%s: hash_val %u mod_val %u",
981 __PRETTY_FUNCTION__
, hash_val
, mod_val
);
985 while (!found
&& (i
< num_ifindex
)) {
986 first_ifindex
= nexthop_tab
[i
].ifindex
;
990 if (PIM_DEBUG_PIM_NHT
)
992 "%s %s: could not find interface for ifindex %d (address %s(%s))",
993 __FILE__
, __PRETTY_FUNCTION__
,
994 first_ifindex
, addr_str
,
1003 if (PIM_DEBUG_PIM_NHT
)
1005 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)",
1006 __PRETTY_FUNCTION__
, ifp
->name
,
1007 pim
->vrf
->name
, first_ifindex
,
1015 && !pim_if_connected_to_source(ifp
, src
->u
.prefix4
)) {
1017 if (PIM_DEBUG_PIM_NHT_DETAIL
)
1018 zlog_debug("ifp name: %s(%s), pim nbr: %p",
1019 ifp
->name
, pim
->vrf
->name
, nbr
);
1020 if (!nbr
&& !if_is_loopback(ifp
)) {
1024 if (PIM_DEBUG_PIM_NHT
)
1026 "%s: NBR not found on input interface %s(%s) (RPF for source %s)",
1027 __PRETTY_FUNCTION__
, ifp
->name
,
1028 pim
->vrf
->name
, addr_str
);
1034 if (PIM_DEBUG_PIM_NHT
) {
1035 char nexthop_str
[PREFIX_STRLEN
];
1037 pim_addr_dump("<nexthop?>",
1038 &nexthop_tab
[i
].nexthop_addr
,
1039 nexthop_str
, sizeof(nexthop_str
));
1041 "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d",
1042 __PRETTY_FUNCTION__
, nexthop_str
,
1043 addr_str
, ifp
->name
, pim
->vrf
->name
,
1044 nexthop_tab
[i
].route_metric
,
1045 nexthop_tab
[i
].protocol_distance
);
1047 /* update nexthop data */
1048 nexthop
->interface
= ifp
;
1049 nexthop
->mrib_nexthop_addr
=
1050 nexthop_tab
[i
].nexthop_addr
;
1051 nexthop
->mrib_metric_preference
=
1052 nexthop_tab
[i
].protocol_distance
;
1053 nexthop
->mrib_route_metric
=
1054 nexthop_tab
[i
].route_metric
;
1055 nexthop
->last_lookup
= src
->u
.prefix4
;
1056 nexthop
->last_lookup_time
= pim_time_monotonic_usec();
1069 int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance
*pim
,
1070 struct prefix
*src
, struct prefix
*grp
)
1072 struct pim_nexthop nhop
;
1075 char addr_str
[PREFIX_STRLEN
];
1077 if (PIM_DEBUG_PIM_NHT
)
1078 pim_inet4_dump("<addr?>", src
->u
.prefix4
, addr_str
,
1081 memset(&nhop
, 0, sizeof(nhop
));
1082 if (!pim_ecmp_nexthop_lookup(pim
, &nhop
, src
, grp
, 0)) {
1083 if (PIM_DEBUG_PIM_NHT
)
1085 "%s: could not find nexthop ifindex for address %s(%s)",
1086 __PRETTY_FUNCTION__
, addr_str
, pim
->vrf
->name
);
1090 ifindex
= nhop
.interface
->ifindex
;
1091 if (PIM_DEBUG_PIM_NHT
)
1093 "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s",
1094 __PRETTY_FUNCTION__
, ifindex
,
1095 ifindex2ifname(ifindex
, pim
->vrf_id
),
1096 pim
->vrf
->name
, addr_str
);
1098 vif_index
= pim_if_find_vifindex_by_ifindex(pim
, ifindex
);
1100 if (vif_index
< 0) {
1101 if (PIM_DEBUG_PIM_NHT
) {
1103 "%s: low vif_index=%d(%s) < 1 nexthop for address %s",
1104 __PRETTY_FUNCTION__
, vif_index
, pim
->vrf
->name
,