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Merge pull request #5498 from mjstapp/sharp_with_labels
[mirror_frr.git] / pimd / pim_nht.c
1 /*
2 * PIM for Quagga
3 * Copyright (C) 2017 Cumulus Networks, Inc.
4 * Chirag Shah
5 *
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.
10 *
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.
15 *
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
19 */
20 #include <zebra.h>
21 #include "network.h"
22 #include "zclient.h"
23 #include "stream.h"
24 #include "nexthop.h"
25 #include "if.h"
26 #include "hash.h"
27 #include "jhash.h"
28
29 #include "pimd.h"
30 #include "pimd/pim_nht.h"
31 #include "log.h"
32 #include "pim_time.h"
33 #include "pim_oil.h"
34 #include "pim_ifchannel.h"
35 #include "pim_mroute.h"
36 #include "pim_zebra.h"
37 #include "pim_upstream.h"
38 #include "pim_join.h"
39 #include "pim_jp_agg.h"
40 #include "pim_zebra.h"
41 #include "pim_zlookup.h"
42 #include "pim_rp.h"
43
44 /**
45 * pim_sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister
46 * command to Zebra.
47 */
48 void pim_sendmsg_zebra_rnh(struct pim_instance *pim, struct zclient *zclient,
49 struct pim_nexthop_cache *pnc, int command)
50 {
51 struct prefix *p;
52 int ret;
53
54 p = &(pnc->rpf.rpf_addr);
55 ret = zclient_send_rnh(zclient, command, p, false, pim->vrf_id);
56 if (ret < 0)
57 zlog_warn("sendmsg_nexthop: zclient_send_message() failed");
58
59 if (PIM_DEBUG_PIM_NHT) {
60 char buf[PREFIX2STR_BUFFER];
61 prefix2str(p, buf, sizeof(buf));
62 zlog_debug(
63 "%s: NHT %sregistered addr %s(%s) with Zebra ret:%d ",
64 __PRETTY_FUNCTION__,
65 (command == ZEBRA_NEXTHOP_REGISTER) ? " " : "de", buf,
66 pim->vrf->name, ret);
67 }
68
69 return;
70 }
71
72 struct pim_nexthop_cache *pim_nexthop_cache_find(struct pim_instance *pim,
73 struct pim_rpf *rpf)
74 {
75 struct pim_nexthop_cache *pnc = NULL;
76 struct pim_nexthop_cache lookup;
77
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;
81
82 pnc = hash_lookup(pim->rpf_hash, &lookup);
83
84 return pnc;
85 }
86
87 static struct pim_nexthop_cache *pim_nexthop_cache_add(struct pim_instance *pim,
88 struct pim_rpf *rpf_addr)
89 {
90 struct pim_nexthop_cache *pnc;
91 char hash_name[64];
92 char buf1[64];
93
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;
100
101 pnc = hash_get(pim->rpf_hash, pnc, hash_alloc_intern);
102
103 pnc->rp_list = list_new();
104 pnc->rp_list->cmp = pim_rp_list_cmp;
105
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);
110
111 return pnc;
112 }
113
114 /*
115 * pim_find_or_track_nexthop
116 *
117 * This API is used to Register an address with Zebra
118 *
119 * 1 -> Success
120 * 0 -> Failure
121 */
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)
126 {
127 struct pim_nexthop_cache *pnc = NULL;
128 struct pim_rpf rpf;
129 struct listnode *ch_node = NULL;
130 struct zclient *zclient = NULL;
131
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;
137
138 pnc = pim_nexthop_cache_find(pim, &rpf);
139 if (!pnc) {
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));
146 zlog_debug(
147 "%s: NHT cache and zebra notification added for %s(%s)",
148 __PRETTY_FUNCTION__, buf, pim->vrf->name);
149 }
150 }
151
152 if (rp != NULL) {
153 ch_node = listnode_lookup(pnc->rp_list, rp);
154 if (ch_node == NULL)
155 listnode_add_sort(pnc->rp_list, rp);
156 }
157
158 if (up != NULL)
159 hash_get(pnc->upstream_hash, up, hash_alloc_intern);
160
161 if (bsr_track_needed)
162 pnc->bsr_tracking = true;
163
164 if (CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) {
165 if (out_pnc)
166 memcpy(out_pnc, pnc, sizeof(struct pim_nexthop_cache));
167 return 1;
168 }
169
170 return 0;
171 }
172
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)
176 {
177 struct pim_nexthop_cache *pnc = NULL;
178 struct pim_nexthop_cache lookup;
179 struct zclient *zclient = NULL;
180 struct listnode *upnode = NULL;
181 struct pim_upstream *upstream = NULL;
182
183 zclient = pim_zebra_zclient_get();
184
185 /* Remove from RPF hash if it is the last entry */
186 lookup.rpf.rpf_addr = *addr;
187 pnc = hash_lookup(pim->rpf_hash, &lookup);
188 if (pnc) {
189 if (rp) {
190 /* Release the (*, G)upstream from pnc->upstream_hash,
191 * whose Group belongs to the RP getting deleted
192 */
193 for (ALL_LIST_ELEMENTS_RO(pim->upstream_list, upnode,
194 upstream)) {
195 struct prefix grp;
196 struct rp_info *trp_info;
197
198 if (upstream->sg.src.s_addr != INADDR_ANY)
199 continue;
200
201 grp.family = AF_INET;
202 grp.prefixlen = IPV4_MAX_BITLEN;
203 grp.u.prefix4 = upstream->sg.grp;
204
205 trp_info = pim_rp_find_match_group(pim, &grp);
206 if (trp_info == rp)
207 hash_release(pnc->upstream_hash,
208 upstream);
209 }
210 listnode_delete(pnc->rp_list, rp);
211 }
212
213 if (up)
214 hash_release(pnc->upstream_hash, up);
215
216 if (del_bsr_tracking)
217 pnc->bsr_tracking = false;
218
219 if (PIM_DEBUG_PIM_NHT) {
220 char buf[PREFIX_STRLEN];
221 prefix2str(addr, buf, sizeof buf);
222 zlog_debug(
223 "%s: NHT %s(%s) rp_list count:%d upstream count:%ld",
224 __PRETTY_FUNCTION__, buf, pim->vrf->name,
225 pnc->rp_list->count, pnc->upstream_hash->count);
226 }
227
228 if (pnc->rp_list->count == 0
229 && pnc->upstream_hash->count == 0
230 && pnc->bsr_tracking == false) {
231 pim_sendmsg_zebra_rnh(pim, zclient, pnc,
232 ZEBRA_NEXTHOP_UNREGISTER);
233
234 list_delete(&pnc->rp_list);
235 hash_free(pnc->upstream_hash);
236
237 hash_release(pim->rpf_hash, pnc);
238 if (pnc->nexthop)
239 nexthops_free(pnc->nexthop);
240 XFREE(MTYPE_PIM_NEXTHOP_CACHE, pnc);
241 }
242 }
243 }
244
245 /* Given a source address and a neighbor address, check if the neighbor is one
246 * of the next hop to reach the source. search from zebra route database
247 */
248 bool pim_nexthop_match(struct pim_instance *pim, struct in_addr addr,
249 struct in_addr ip_src)
250 {
251 struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM];
252 int i = 0;
253 ifindex_t first_ifindex = 0;
254 struct interface *ifp = NULL;
255 struct pim_neighbor *nbr = NULL;
256 int num_ifindex;
257
258 if (addr.s_addr == INADDR_NONE)
259 return 0;
260
261 memset(nexthop_tab, 0,
262 sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM);
263 num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM,
264 addr, PIM_NEXTHOP_LOOKUP_MAX);
265 if (num_ifindex < 1) {
266 char addr_str[INET_ADDRSTRLEN];
267
268 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
269 zlog_warn(
270 "%s %s: could not find nexthop ifindex for address %s",
271 __FILE__, __PRETTY_FUNCTION__, addr_str);
272 return 0;
273 }
274
275 while (i < num_ifindex) {
276 first_ifindex = nexthop_tab[i].ifindex;
277
278 ifp = if_lookup_by_index(first_ifindex, pim->vrf_id);
279 if (!ifp) {
280 if (PIM_DEBUG_ZEBRA) {
281 char addr_str[INET_ADDRSTRLEN];
282
283 pim_inet4_dump("<addr?>", addr, addr_str,
284 sizeof(addr_str));
285 zlog_debug(
286 "%s %s: could not find interface for ifindex %d (address %s)",
287 __FILE__, __PRETTY_FUNCTION__,
288 first_ifindex, addr_str);
289 }
290 i++;
291 continue;
292 }
293
294 if (!ifp->info) {
295 if (PIM_DEBUG_ZEBRA) {
296 char addr_str[INET_ADDRSTRLEN];
297
298 pim_inet4_dump("<addr?>", addr, addr_str,
299 sizeof(addr_str));
300 zlog_debug(
301 "%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)",
302 __PRETTY_FUNCTION__, ifp->name,
303 first_ifindex, addr_str);
304 }
305 i++;
306 continue;
307 }
308
309 if (!pim_if_connected_to_source(ifp, addr)) {
310 nbr = pim_neighbor_find(
311 ifp, nexthop_tab[i].nexthop_addr.u.prefix4);
312 if (PIM_DEBUG_PIM_TRACE_DETAIL)
313 zlog_debug("ifp name: %s, pim nbr: %p",
314 ifp->name, nbr);
315 if (!nbr && !if_is_loopback(ifp)) {
316 i++;
317 continue;
318 }
319 }
320
321 if (nexthop_tab[i].nexthop_addr.u.prefix4.s_addr
322 == ip_src.s_addr)
323 return 1;
324
325 i++;
326 }
327
328 return 0;
329 }
330
331 /* Given a source address and a neighbor address, check if the neighbor is one
332 * of the next hop to reach the source. search from pim next hop cache
333 */
334 bool pim_nexthop_match_nht_cache(struct pim_instance *pim, struct in_addr addr,
335 struct in_addr ip_src)
336 {
337 struct pim_rpf rpf;
338 ifindex_t first_ifindex;
339 struct interface *ifp = NULL;
340 uint8_t nh_iter = 0;
341 struct pim_neighbor *nbr = NULL;
342 struct nexthop *nh_node = NULL;
343 struct pim_nexthop_cache *pnc = NULL;
344
345 memset(&rpf, 0, sizeof(struct pim_rpf));
346 rpf.rpf_addr.family = AF_INET;
347 rpf.rpf_addr.prefixlen = IPV4_MAX_BITLEN;
348 rpf.rpf_addr.u.prefix4 = addr;
349
350 pnc = pim_nexthop_cache_find(pim, &rpf);
351 if (!pnc || !pnc->nexthop_num)
352 return 0;
353
354 for (nh_node = pnc->nexthop; nh_node; nh_node = nh_node->next) {
355 first_ifindex = nh_node->ifindex;
356 ifp = if_lookup_by_index(first_ifindex, pim->vrf_id);
357 if (!ifp) {
358 if (PIM_DEBUG_PIM_NHT) {
359 char addr_str[INET_ADDRSTRLEN];
360
361 pim_inet4_dump("<addr?>", addr, addr_str,
362 sizeof(addr_str));
363 zlog_debug(
364 "%s %s: could not find interface for ifindex %d (address %s(%s))",
365 __FILE__, __PRETTY_FUNCTION__,
366 first_ifindex, addr_str,
367 pim->vrf->name);
368 }
369 nh_iter++;
370 continue;
371 }
372 if (!ifp->info) {
373 if (PIM_DEBUG_PIM_NHT) {
374 char addr_str[INET_ADDRSTRLEN];
375
376 pim_inet4_dump("<addr?>", addr, addr_str,
377 sizeof(addr_str));
378 zlog_debug(
379 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)",
380 __PRETTY_FUNCTION__, ifp->name,
381 pim->vrf->name, first_ifindex,
382 addr_str);
383 }
384 nh_iter++;
385 continue;
386 }
387
388 if (!pim_if_connected_to_source(ifp, addr)) {
389 nbr = pim_neighbor_find(ifp, nh_node->gate.ipv4);
390 if (!nbr && !if_is_loopback(ifp)) {
391 if (PIM_DEBUG_PIM_NHT)
392 zlog_debug(
393 "%s: pim nbr not found on input interface %s(%s)",
394 __PRETTY_FUNCTION__, ifp->name,
395 pim->vrf->name);
396 nh_iter++;
397 continue;
398 }
399 }
400
401 if (nh_node->gate.ipv4.s_addr == ip_src.s_addr)
402 return 1;
403 }
404
405 return 0;
406 }
407
408 void pim_rp_nexthop_del(struct rp_info *rp_info)
409 {
410 rp_info->rp.source_nexthop.interface = NULL;
411 rp_info->rp.source_nexthop.mrib_nexthop_addr.u.prefix4.s_addr =
412 PIM_NET_INADDR_ANY;
413 rp_info->rp.source_nexthop.mrib_metric_preference =
414 router->infinite_assert_metric.metric_preference;
415 rp_info->rp.source_nexthop.mrib_route_metric =
416 router->infinite_assert_metric.route_metric;
417 }
418
419 /* Update RP nexthop info based on Nexthop update received from Zebra.*/
420 static void pim_update_rp_nh(struct pim_instance *pim,
421 struct pim_nexthop_cache *pnc)
422 {
423 struct listnode *node = NULL;
424 struct rp_info *rp_info = NULL;
425
426 /*Traverse RP list and update each RP Nexthop info */
427 for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) {
428 if (rp_info->rp.rpf_addr.u.prefix4.s_addr == INADDR_NONE)
429 continue;
430
431 // Compute PIM RPF using cached nexthop
432 if (!pim_ecmp_nexthop_lookup(pim, &rp_info->rp.source_nexthop,
433 &rp_info->rp.rpf_addr,
434 &rp_info->group, 1))
435 pim_rp_nexthop_del(rp_info);
436 }
437 }
438
439 /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/
440 static int pim_update_upstream_nh_helper(struct hash_bucket *bucket, void *arg)
441 {
442 struct pim_instance *pim = (struct pim_instance *)arg;
443 struct pim_upstream *up = (struct pim_upstream *)bucket->data;
444
445 enum pim_rpf_result rpf_result;
446 struct pim_rpf old;
447
448 old.source_nexthop.interface = up->rpf.source_nexthop.interface;
449 rpf_result = pim_rpf_update(pim, up, &old, __func__);
450
451 /* update kernel multicast forwarding cache (MFC); if the
452 * RPF nbr is now unreachable the MFC has already been updated
453 * by pim_rpf_clear
454 */
455 if (rpf_result != PIM_RPF_FAILURE)
456 pim_upstream_mroute_iif_update(up->channel_oil, __func__);
457
458 if (rpf_result == PIM_RPF_CHANGED ||
459 (rpf_result == PIM_RPF_FAILURE && old.source_nexthop.interface))
460 pim_zebra_upstream_rpf_changed(pim, up, &old);
461
462
463 if (PIM_DEBUG_PIM_NHT) {
464 zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s",
465 __PRETTY_FUNCTION__, up->sg_str, pim->vrf->name,
466 old.source_nexthop.interface
467 ? old.source_nexthop.interface->name : "Unknown",
468 up->rpf.source_nexthop.interface
469 ? up->rpf.source_nexthop.interface->name : "Unknown");
470 }
471
472 return HASHWALK_CONTINUE;
473 }
474
475 static int pim_update_upstream_nh(struct pim_instance *pim,
476 struct pim_nexthop_cache *pnc)
477 {
478 hash_walk(pnc->upstream_hash, pim_update_upstream_nh_helper, pim);
479
480 pim_zebra_update_all_interfaces(pim);
481
482 return 0;
483 }
484
485 uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp)
486 {
487 uint32_t hash_val;
488 uint32_t s = 0, g = 0;
489
490 if ((!src))
491 return 0;
492
493 switch (src->family) {
494 case AF_INET: {
495 s = src->u.prefix4.s_addr;
496 s = s == 0 ? 1 : s;
497 if (grp)
498 g = grp->u.prefix4.s_addr;
499 } break;
500 default:
501 break;
502 }
503
504 hash_val = jhash_2words(g, s, 101);
505 return hash_val;
506 }
507
508 static int pim_ecmp_nexthop_search(struct pim_instance *pim,
509 struct pim_nexthop_cache *pnc,
510 struct pim_nexthop *nexthop,
511 struct prefix *src, struct prefix *grp,
512 int neighbor_needed)
513 {
514 struct pim_neighbor *nbrs[MULTIPATH_NUM], *nbr = NULL;
515 struct interface *ifps[MULTIPATH_NUM];
516 struct nexthop *nh_node = NULL;
517 ifindex_t first_ifindex;
518 struct interface *ifp = NULL;
519 uint32_t hash_val = 0, mod_val = 0;
520 uint8_t nh_iter = 0, found = 0;
521 uint32_t i, num_nbrs = 0;
522
523 if (!pnc || !pnc->nexthop_num || !nexthop)
524 return 0;
525
526 memset(&nbrs, 0, sizeof(nbrs));
527 memset(&ifps, 0, sizeof(ifps));
528
529 // Current Nexthop is VALID, check to stay on the current path.
530 if (nexthop->interface && nexthop->interface->info
531 && nexthop->mrib_nexthop_addr.u.prefix4.s_addr
532 != PIM_NET_INADDR_ANY) {
533 /* User configured knob to explicitly switch
534 to new path is disabled or current path
535 metric is less than nexthop update.
536 */
537
538 if (pim->ecmp_rebalance_enable == 0) {
539 uint8_t curr_route_valid = 0;
540 // Check if current nexthop is present in new updated
541 // Nexthop list.
542 // If the current nexthop is not valid, candidate to
543 // choose new Nexthop.
544 for (nh_node = pnc->nexthop; nh_node;
545 nh_node = nh_node->next) {
546 curr_route_valid = (nexthop->interface->ifindex
547 == nh_node->ifindex);
548 if (curr_route_valid)
549 break;
550 }
551
552 if (curr_route_valid
553 && !pim_if_connected_to_source(nexthop->interface,
554 src->u.prefix4)) {
555 nbr = pim_neighbor_find(
556 nexthop->interface,
557 nexthop->mrib_nexthop_addr.u.prefix4);
558 if (!nbr
559 && !if_is_loopback(nexthop->interface)) {
560 if (PIM_DEBUG_PIM_NHT)
561 zlog_debug(
562 "%s: current nexthop does not have nbr ",
563 __PRETTY_FUNCTION__);
564 } else {
565 if (PIM_DEBUG_PIM_NHT) {
566 char src_str[INET_ADDRSTRLEN];
567 pim_inet4_dump("<addr?>",
568 src->u.prefix4,
569 src_str,
570 sizeof(src_str));
571 char grp_str[INET_ADDRSTRLEN];
572 pim_inet4_dump("<addr?>",
573 grp->u.prefix4,
574 grp_str,
575 sizeof(grp_str));
576 zlog_debug(
577 "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection",
578 __PRETTY_FUNCTION__,
579 src_str, grp_str,
580 pim->vrf->name,
581 nexthop->interface->name);
582 }
583 return 1;
584 }
585 }
586 }
587 }
588
589 /*
590 * Look up all interfaces and neighbors,
591 * store for later usage
592 */
593 for (nh_node = pnc->nexthop, i = 0; nh_node;
594 nh_node = nh_node->next, i++) {
595 ifps[i] = if_lookup_by_index(nh_node->ifindex, pim->vrf_id);
596 if (ifps[i]) {
597 nbrs[i] = pim_neighbor_find(ifps[i],
598 nh_node->gate.ipv4);
599 if (nbrs[i] || pim_if_connected_to_source(ifps[i],
600
601 src->u.prefix4))
602 num_nbrs++;
603 }
604 }
605 if (pim->ecmp_enable) {
606 uint32_t consider = pnc->nexthop_num;
607
608 if (neighbor_needed && num_nbrs < consider)
609 consider = num_nbrs;
610
611 if (consider == 0)
612 return 0;
613
614 // PIM ECMP flag is enable then choose ECMP path.
615 hash_val = pim_compute_ecmp_hash(src, grp);
616 mod_val = hash_val % consider;
617 }
618
619 for (nh_node = pnc->nexthop; nh_node && (found == 0);
620 nh_node = nh_node->next) {
621 first_ifindex = nh_node->ifindex;
622 ifp = ifps[nh_iter];
623 if (!ifp) {
624 if (PIM_DEBUG_PIM_NHT) {
625 char addr_str[INET_ADDRSTRLEN];
626 pim_inet4_dump("<addr?>", src->u.prefix4,
627 addr_str, sizeof(addr_str));
628 zlog_debug(
629 "%s %s: could not find interface for ifindex %d (address %s(%s))",
630 __FILE__, __PRETTY_FUNCTION__,
631 first_ifindex, addr_str,
632 pim->vrf->name);
633 }
634 if (nh_iter == mod_val)
635 mod_val++; // Select nexthpath
636 nh_iter++;
637 continue;
638 }
639 if (!ifp->info) {
640 if (PIM_DEBUG_PIM_NHT) {
641 char addr_str[INET_ADDRSTRLEN];
642 pim_inet4_dump("<addr?>", src->u.prefix4,
643 addr_str, sizeof(addr_str));
644 zlog_debug(
645 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)",
646 __PRETTY_FUNCTION__, ifp->name,
647 pim->vrf->name, first_ifindex,
648 addr_str);
649 }
650 if (nh_iter == mod_val)
651 mod_val++; // Select nexthpath
652 nh_iter++;
653 continue;
654 }
655
656 if (neighbor_needed
657 && !pim_if_connected_to_source(ifp, src->u.prefix4)) {
658 nbr = nbrs[nh_iter];
659 if (!nbr && !if_is_loopback(ifp)) {
660 if (PIM_DEBUG_PIM_NHT)
661 zlog_debug(
662 "%s: pim nbr not found on input interface %s(%s)",
663 __PRETTY_FUNCTION__, ifp->name,
664 pim->vrf->name);
665 if (nh_iter == mod_val)
666 mod_val++; // Select nexthpath
667 nh_iter++;
668 continue;
669 }
670 }
671
672 if (nh_iter == mod_val) {
673 nexthop->interface = ifp;
674 nexthop->mrib_nexthop_addr.family = AF_INET;
675 nexthop->mrib_nexthop_addr.prefixlen = IPV4_MAX_BITLEN;
676 nexthop->mrib_nexthop_addr.u.prefix4 =
677 nh_node->gate.ipv4;
678 nexthop->mrib_metric_preference = pnc->distance;
679 nexthop->mrib_route_metric = pnc->metric;
680 nexthop->last_lookup = src->u.prefix4;
681 nexthop->last_lookup_time = pim_time_monotonic_usec();
682 nexthop->nbr = nbr;
683 found = 1;
684 if (PIM_DEBUG_PIM_NHT) {
685 char buf[INET_ADDRSTRLEN];
686 char buf2[INET_ADDRSTRLEN];
687 char buf3[INET_ADDRSTRLEN];
688 pim_inet4_dump("<src?>", src->u.prefix4, buf2,
689 sizeof(buf2));
690 pim_inet4_dump("<grp?>", grp->u.prefix4, buf3,
691 sizeof(buf3));
692 pim_inet4_dump(
693 "<rpf?>",
694 nexthop->mrib_nexthop_addr.u.prefix4,
695 buf, sizeof(buf));
696 zlog_debug(
697 "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d",
698 __PRETTY_FUNCTION__, buf2, buf3,
699 pim->vrf->name, ifp->name, buf, mod_val,
700 nh_iter, pim->ecmp_enable);
701 }
702 }
703 nh_iter++;
704 }
705
706 if (found)
707 return 1;
708 else
709 return 0;
710 }
711
712 /* This API is used to parse Registered address nexthop update coming from Zebra
713 */
714 int pim_parse_nexthop_update(ZAPI_CALLBACK_ARGS)
715 {
716 struct nexthop *nexthop;
717 struct nexthop *nhlist_head = NULL;
718 struct nexthop *nhlist_tail = NULL;
719 int i;
720 struct pim_rpf rpf;
721 struct pim_nexthop_cache *pnc = NULL;
722 struct pim_neighbor *nbr = NULL;
723 struct interface *ifp = NULL;
724 struct interface *ifp1 = NULL;
725 struct vrf *vrf = vrf_lookup_by_id(vrf_id);
726 struct pim_instance *pim;
727 struct zapi_route nhr;
728
729 if (!vrf)
730 return 0;
731 pim = vrf->info;
732
733 if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) {
734 if (PIM_DEBUG_PIM_NHT)
735 zlog_debug(
736 "%s: Decode of nexthop update from zebra failed",
737 __PRETTY_FUNCTION__);
738 return 0;
739 }
740
741 if (cmd == ZEBRA_NEXTHOP_UPDATE) {
742 prefix_copy(&rpf.rpf_addr, &nhr.prefix);
743 pnc = pim_nexthop_cache_find(pim, &rpf);
744 if (!pnc) {
745 if (PIM_DEBUG_PIM_NHT) {
746 char buf[PREFIX2STR_BUFFER];
747 prefix2str(&rpf.rpf_addr, buf, sizeof(buf));
748 zlog_debug(
749 "%s: Skipping NHT update, addr %s is not in local cached DB.",
750 __PRETTY_FUNCTION__, buf);
751 }
752 return 0;
753 }
754 } else {
755 /*
756 * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE
757 */
758 return 0;
759 }
760
761 pnc->last_update = pim_time_monotonic_usec();
762
763 if (nhr.nexthop_num) {
764 pnc->nexthop_num = 0; // Only increment for pim enabled rpf.
765
766 for (i = 0; i < nhr.nexthop_num; i++) {
767 nexthop = nexthop_from_zapi_nexthop(&nhr.nexthops[i]);
768 switch (nexthop->type) {
769 case NEXTHOP_TYPE_IPV4:
770 case NEXTHOP_TYPE_IPV4_IFINDEX:
771 case NEXTHOP_TYPE_IPV6:
772 case NEXTHOP_TYPE_BLACKHOLE:
773 break;
774 case NEXTHOP_TYPE_IFINDEX:
775 /*
776 * Connected route (i.e. no nexthop), use
777 * RPF address from nexthop cache (i.e.
778 * destination) as PIM nexthop.
779 */
780 nexthop->type = NEXTHOP_TYPE_IPV4_IFINDEX;
781 nexthop->gate.ipv4 =
782 pnc->rpf.rpf_addr.u.prefix4;
783 break;
784 case NEXTHOP_TYPE_IPV6_IFINDEX:
785 ifp1 = if_lookup_by_index(nexthop->ifindex,
786 pim->vrf_id);
787 nbr = pim_neighbor_find_if(ifp1);
788 /* Overwrite with Nbr address as NH addr */
789 if (nbr)
790 nexthop->gate.ipv4 = nbr->source_addr;
791 else {
792 // Mark nexthop address to 0 until PIM
793 // Nbr is resolved.
794 nexthop->gate.ipv4.s_addr =
795 PIM_NET_INADDR_ANY;
796 }
797
798 break;
799 }
800
801 ifp = if_lookup_by_index(nexthop->ifindex, pim->vrf_id);
802 if (!ifp) {
803 if (PIM_DEBUG_PIM_NHT) {
804 char buf[NEXTHOP_STRLEN];
805 zlog_debug(
806 "%s: could not find interface for ifindex %d(%s) (addr %s)",
807 __PRETTY_FUNCTION__,
808 nexthop->ifindex,
809 pim->vrf->name,
810 nexthop2str(nexthop, buf,
811 sizeof(buf)));
812 }
813 nexthop_free(nexthop);
814 continue;
815 }
816
817 if (PIM_DEBUG_PIM_NHT) {
818 char p_str[PREFIX2STR_BUFFER];
819
820 prefix2str(&nhr.prefix, p_str, sizeof(p_str));
821 zlog_debug(
822 "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ",
823 __PRETTY_FUNCTION__, p_str,
824 pim->vrf->name, i + 1,
825 inet_ntoa(nexthop->gate.ipv4),
826 ifp->name, nexthop->type, nhr.distance,
827 nhr.metric);
828 }
829
830 if (!ifp->info) {
831 /*
832 * Though Multicast is not enabled on this
833 * Interface store it in database otheriwse we
834 * may miss this update and this will not cause
835 * any issue, because while choosing the path we
836 * are ommitting the Interfaces which are not
837 * multicast enabled
838 */
839 if (PIM_DEBUG_PIM_NHT) {
840 char buf[NEXTHOP_STRLEN];
841
842 zlog_debug(
843 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)",
844 __PRETTY_FUNCTION__, ifp->name,
845 pim->vrf->name,
846 nexthop->ifindex,
847 nexthop2str(nexthop, buf,
848 sizeof(buf)));
849 }
850 }
851
852 if (nhlist_tail) {
853 nhlist_tail->next = nexthop;
854 nhlist_tail = nexthop;
855 } else {
856 nhlist_tail = nexthop;
857 nhlist_head = nexthop;
858 }
859 // Only keep track of nexthops which are PIM enabled.
860 pnc->nexthop_num++;
861 }
862 /* Reset existing pnc->nexthop before assigning new list */
863 nexthops_free(pnc->nexthop);
864 pnc->nexthop = nhlist_head;
865 if (pnc->nexthop_num) {
866 pnc->flags |= PIM_NEXTHOP_VALID;
867 pnc->distance = nhr.distance;
868 pnc->metric = nhr.metric;
869 }
870 } else {
871 pnc->flags &= ~PIM_NEXTHOP_VALID;
872 pnc->nexthop_num = nhr.nexthop_num;
873 nexthops_free(pnc->nexthop);
874 pnc->nexthop = NULL;
875 }
876 SET_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED);
877
878 if (PIM_DEBUG_PIM_NHT) {
879 char buf[PREFIX2STR_BUFFER];
880 prefix2str(&nhr.prefix, buf, sizeof(buf));
881 zlog_debug(
882 "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d",
883 __PRETTY_FUNCTION__, buf, pim->vrf->name,
884 nhr.nexthop_num, pnc->nexthop_num, vrf_id,
885 pnc->upstream_hash->count, listcount(pnc->rp_list));
886 }
887
888 pim_rpf_set_refresh_time(pim);
889
890 if (listcount(pnc->rp_list))
891 pim_update_rp_nh(pim, pnc);
892 if (pnc->upstream_hash->count)
893 pim_update_upstream_nh(pim, pnc);
894
895 return 0;
896 }
897
898 int pim_ecmp_nexthop_lookup(struct pim_instance *pim,
899 struct pim_nexthop *nexthop, struct prefix *src,
900 struct prefix *grp, int neighbor_needed)
901 {
902 struct pim_nexthop_cache *pnc;
903 struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM];
904 struct pim_neighbor *nbrs[MULTIPATH_NUM], *nbr = NULL;
905 struct pim_rpf rpf;
906 int num_ifindex;
907 struct interface *ifps[MULTIPATH_NUM], *ifp;
908 int first_ifindex;
909 int found = 0;
910 uint8_t i = 0;
911 uint32_t hash_val = 0, mod_val = 0;
912 uint32_t num_nbrs = 0;
913 char addr_str[PREFIX_STRLEN];
914
915 if (PIM_DEBUG_PIM_NHT) {
916 pim_inet4_dump("<addr?>", src->u.prefix4, addr_str,
917 sizeof(addr_str));
918 zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld",
919 __PRETTY_FUNCTION__, addr_str, pim->vrf->name,
920 nexthop->last_lookup_time);
921 }
922
923 memset(&rpf, 0, sizeof(struct pim_rpf));
924 rpf.rpf_addr.family = AF_INET;
925 rpf.rpf_addr.prefixlen = IPV4_MAX_BITLEN;
926 rpf.rpf_addr.u.prefix4 = src->u.prefix4;
927
928 pnc = pim_nexthop_cache_find(pim, &rpf);
929 if (pnc) {
930 if (CHECK_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED))
931 return pim_ecmp_nexthop_search(pim, pnc, nexthop, src, grp,
932 neighbor_needed);
933 }
934
935 memset(nexthop_tab, 0,
936 sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM);
937 num_ifindex =
938 zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM,
939 src->u.prefix4, PIM_NEXTHOP_LOOKUP_MAX);
940 if (num_ifindex < 1) {
941 if (PIM_DEBUG_PIM_NHT)
942 zlog_warn(
943 "%s: could not find nexthop ifindex for address %s(%s)",
944 __PRETTY_FUNCTION__, addr_str, pim->vrf->name);
945 return 0;
946 }
947
948 memset(&nbrs, 0, sizeof(nbrs));
949 memset(&ifps, 0, sizeof(ifps));
950
951 /*
952 * Look up all interfaces and neighbors,
953 * store for later usage
954 */
955 for (i = 0; i < num_ifindex; i++) {
956 ifps[i] = if_lookup_by_index(nexthop_tab[i].ifindex,
957 pim->vrf_id);
958 if (ifps[i]) {
959 nbrs[i] = pim_neighbor_find(
960 ifps[i], nexthop_tab[i].nexthop_addr.u.prefix4);
961 if (nbrs[i]
962 || pim_if_connected_to_source(ifps[i],
963 src->u.prefix4))
964 num_nbrs++;
965 }
966 }
967
968 // If PIM ECMP enable then choose ECMP path.
969 if (pim->ecmp_enable) {
970 uint32_t consider = num_ifindex;
971
972 if (neighbor_needed && num_nbrs < consider)
973 consider = num_nbrs;
974
975 if (consider == 0)
976 return 0;
977
978 hash_val = pim_compute_ecmp_hash(src, grp);
979 mod_val = hash_val % consider;
980 if (PIM_DEBUG_PIM_NHT_DETAIL)
981 zlog_debug("%s: hash_val %u mod_val %u",
982 __PRETTY_FUNCTION__, hash_val, mod_val);
983 }
984
985 i = 0;
986 while (!found && (i < num_ifindex)) {
987 first_ifindex = nexthop_tab[i].ifindex;
988
989 ifp = ifps[i];
990 if (!ifp) {
991 if (PIM_DEBUG_PIM_NHT)
992 zlog_debug(
993 "%s %s: could not find interface for ifindex %d (address %s(%s))",
994 __FILE__, __PRETTY_FUNCTION__,
995 first_ifindex, addr_str,
996 pim->vrf->name);
997 if (i == mod_val)
998 mod_val++;
999 i++;
1000 continue;
1001 }
1002
1003 if (!ifp->info) {
1004 if (PIM_DEBUG_PIM_NHT)
1005 zlog_debug(
1006 "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)",
1007 __PRETTY_FUNCTION__, ifp->name,
1008 pim->vrf->name, first_ifindex,
1009 addr_str);
1010 if (i == mod_val)
1011 mod_val++;
1012 i++;
1013 continue;
1014 }
1015 if (neighbor_needed
1016 && !pim_if_connected_to_source(ifp, src->u.prefix4)) {
1017 nbr = nbrs[i];
1018 if (PIM_DEBUG_PIM_NHT_DETAIL)
1019 zlog_debug("ifp name: %s(%s), pim nbr: %p",
1020 ifp->name, pim->vrf->name, nbr);
1021 if (!nbr && !if_is_loopback(ifp)) {
1022 if (i == mod_val)
1023 mod_val++;
1024 i++;
1025 if (PIM_DEBUG_PIM_NHT)
1026 zlog_debug(
1027 "%s: NBR not found on input interface %s(%s) (RPF for source %s)",
1028 __PRETTY_FUNCTION__, ifp->name,
1029 pim->vrf->name, addr_str);
1030 continue;
1031 }
1032 }
1033
1034 if (i == mod_val) {
1035 if (PIM_DEBUG_PIM_NHT) {
1036 char nexthop_str[PREFIX_STRLEN];
1037
1038 pim_addr_dump("<nexthop?>",
1039 &nexthop_tab[i].nexthop_addr,
1040 nexthop_str, sizeof(nexthop_str));
1041 zlog_debug(
1042 "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d",
1043 __PRETTY_FUNCTION__, nexthop_str,
1044 addr_str, ifp->name, pim->vrf->name,
1045 nexthop_tab[i].route_metric,
1046 nexthop_tab[i].protocol_distance);
1047 }
1048 /* update nexthop data */
1049 nexthop->interface = ifp;
1050 nexthop->mrib_nexthop_addr =
1051 nexthop_tab[i].nexthop_addr;
1052 nexthop->mrib_metric_preference =
1053 nexthop_tab[i].protocol_distance;
1054 nexthop->mrib_route_metric =
1055 nexthop_tab[i].route_metric;
1056 nexthop->last_lookup = src->u.prefix4;
1057 nexthop->last_lookup_time = pim_time_monotonic_usec();
1058 nexthop->nbr = nbr;
1059 found = 1;
1060 }
1061 i++;
1062 }
1063
1064 if (found)
1065 return 1;
1066 else
1067 return 0;
1068 }
1069
1070 int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim,
1071 struct prefix *src, struct prefix *grp)
1072 {
1073 struct pim_nexthop nhop;
1074 int vif_index;
1075 ifindex_t ifindex;
1076 char addr_str[PREFIX_STRLEN];
1077
1078 if (PIM_DEBUG_PIM_NHT)
1079 pim_inet4_dump("<addr?>", src->u.prefix4, addr_str,
1080 sizeof(addr_str));
1081
1082 memset(&nhop, 0, sizeof(nhop));
1083 if (!pim_ecmp_nexthop_lookup(pim, &nhop, src, grp, 0)) {
1084 if (PIM_DEBUG_PIM_NHT)
1085 zlog_debug(
1086 "%s: could not find nexthop ifindex for address %s(%s)",
1087 __PRETTY_FUNCTION__, addr_str, pim->vrf->name);
1088 return -1;
1089 }
1090
1091 ifindex = nhop.interface->ifindex;
1092 if (PIM_DEBUG_PIM_NHT)
1093 zlog_debug(
1094 "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s",
1095 __PRETTY_FUNCTION__, ifindex,
1096 ifindex2ifname(ifindex, pim->vrf_id),
1097 pim->vrf->name, addr_str);
1098
1099 vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex);
1100
1101 if (vif_index < 0) {
1102 if (PIM_DEBUG_PIM_NHT) {
1103 zlog_debug(
1104 "%s: low vif_index=%d(%s) < 1 nexthop for address %s",
1105 __PRETTY_FUNCTION__, vif_index, pim->vrf->name,
1106 addr_str);
1107 }
1108 return -2;
1109 }
1110
1111 return vif_index;
1112 }
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