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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 | } |