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1bc98276 CS |
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 | * | |
896014f4 DL |
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 | |
1bc98276 CS |
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" | |
633988a7 | 41 | #include "pim_zlookup.h" |
1bc98276 CS |
42 | |
43 | /** | |
44 | * pim_sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister | |
45 | * command to Zebra. | |
46 | */ | |
d62a17ae | 47 | void pim_sendmsg_zebra_rnh(struct zclient *zclient, |
48 | struct pim_nexthop_cache *pnc, int command) | |
1bc98276 | 49 | { |
d62a17ae | 50 | struct stream *s; |
51 | struct prefix *p; | |
52 | int ret; | |
53 | ||
54 | /* Check socket. */ | |
55 | if (!zclient || zclient->sock < 0) | |
56 | return; | |
57 | ||
58 | p = &(pnc->rpf.rpf_addr); | |
59 | s = zclient->obuf; | |
60 | stream_reset(s); | |
0708beb1 | 61 | zclient_create_header(s, command, pimg->vrf_id); |
d62a17ae | 62 | /* get update for all routes for a prefix */ |
63 | stream_putc(s, 0); | |
64 | ||
65 | stream_putw(s, PREFIX_FAMILY(p)); | |
66 | stream_putc(s, p->prefixlen); | |
67 | switch (PREFIX_FAMILY(p)) { | |
68 | case AF_INET: | |
69 | stream_put_in_addr(s, &p->u.prefix4); | |
70 | break; | |
71 | case AF_INET6: | |
72 | stream_put(s, &(p->u.prefix6), 16); | |
73 | break; | |
74 | default: | |
75 | break; | |
76 | } | |
77 | stream_putw_at(s, 0, stream_get_endp(s)); | |
78 | ||
79 | ret = zclient_send_message(zclient); | |
80 | if (ret < 0) | |
81 | zlog_warn("sendmsg_nexthop: zclient_send_message() failed"); | |
82 | ||
83 | ||
84 | if (PIM_DEBUG_TRACE) { | |
85 | char buf[PREFIX2STR_BUFFER]; | |
86 | prefix2str(p, buf, sizeof(buf)); | |
87 | zlog_debug("%s: NHT %sregistered addr %s with Zebra ret:%d ", | |
88 | __PRETTY_FUNCTION__, | |
89 | (command == ZEBRA_NEXTHOP_REGISTER) ? " " : "de", | |
90 | buf, ret); | |
91 | } | |
92 | ||
93 | return; | |
1bc98276 CS |
94 | } |
95 | ||
d0a4f55d DS |
96 | struct pim_nexthop_cache *pim_nexthop_cache_find(struct pim_instance *pim, |
97 | struct pim_rpf *rpf) | |
1bc98276 | 98 | { |
d62a17ae | 99 | struct pim_nexthop_cache *pnc = NULL; |
100 | struct pim_nexthop_cache lookup; | |
1bc98276 | 101 | |
d62a17ae | 102 | lookup.rpf.rpf_addr.family = rpf->rpf_addr.family; |
103 | lookup.rpf.rpf_addr.prefixlen = rpf->rpf_addr.prefixlen; | |
104 | lookup.rpf.rpf_addr.u.prefix4.s_addr = rpf->rpf_addr.u.prefix4.s_addr; | |
1bc98276 | 105 | |
d0a4f55d | 106 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
1bc98276 | 107 | |
d62a17ae | 108 | return pnc; |
1bc98276 CS |
109 | } |
110 | ||
d0a4f55d DS |
111 | struct pim_nexthop_cache *pim_nexthop_cache_add(struct pim_instance *pim, |
112 | struct pim_rpf *rpf_addr) | |
1bc98276 | 113 | { |
d62a17ae | 114 | struct pim_nexthop_cache *pnc; |
115 | ||
116 | pnc = XCALLOC(MTYPE_PIM_NEXTHOP_CACHE, | |
117 | sizeof(struct pim_nexthop_cache)); | |
118 | if (!pnc) { | |
119 | zlog_err("%s: NHT PIM XCALLOC failure ", __PRETTY_FUNCTION__); | |
120 | return NULL; | |
121 | } | |
122 | pnc->rpf.rpf_addr.family = rpf_addr->rpf_addr.family; | |
123 | pnc->rpf.rpf_addr.prefixlen = rpf_addr->rpf_addr.prefixlen; | |
124 | pnc->rpf.rpf_addr.u.prefix4.s_addr = | |
125 | rpf_addr->rpf_addr.u.prefix4.s_addr; | |
126 | ||
d0a4f55d | 127 | pnc = hash_get(pim->rpf_hash, pnc, hash_alloc_intern); |
d62a17ae | 128 | |
129 | pnc->rp_list = list_new(); | |
130 | pnc->rp_list->cmp = pim_rp_list_cmp; | |
131 | ||
132 | pnc->upstream_list = list_new(); | |
133 | pnc->upstream_list->cmp = pim_upstream_compare; | |
134 | ||
135 | if (PIM_DEBUG_ZEBRA) { | |
136 | char rpf_str[PREFIX_STRLEN]; | |
137 | pim_addr_dump("<nht?>", &rpf_addr->rpf_addr, rpf_str, | |
138 | sizeof(rpf_str)); | |
139 | zlog_debug( | |
140 | "%s: NHT hash node, RP and UP lists allocated for %s ", | |
141 | __PRETTY_FUNCTION__, rpf_str); | |
142 | } | |
143 | ||
144 | return pnc; | |
1bc98276 CS |
145 | } |
146 | ||
cb9c7c50 DS |
147 | /* |
148 | * pim_find_or_track_nexthop | |
149 | * | |
150 | * This API is used to Register an address with Zebra | |
151 | * | |
152 | * 1 -> Success | |
153 | * 0 -> Failure | |
154 | */ | |
d62a17ae | 155 | int pim_find_or_track_nexthop(struct prefix *addr, struct pim_upstream *up, |
156 | struct rp_info *rp, | |
157 | struct pim_nexthop_cache *out_pnc) | |
1bc98276 | 158 | { |
d62a17ae | 159 | struct pim_nexthop_cache *pnc = NULL; |
160 | struct pim_rpf rpf; | |
161 | struct listnode *ch_node = NULL; | |
162 | struct zclient *zclient = NULL; | |
163 | ||
164 | zclient = pim_zebra_zclient_get(); | |
165 | memset(&rpf, 0, sizeof(struct pim_rpf)); | |
166 | rpf.rpf_addr.family = addr->family; | |
167 | rpf.rpf_addr.prefixlen = addr->prefixlen; | |
168 | rpf.rpf_addr.u.prefix4 = addr->u.prefix4; | |
169 | ||
d0a4f55d | 170 | pnc = pim_nexthop_cache_find(pimg, &rpf); |
d62a17ae | 171 | if (!pnc) { |
d0a4f55d | 172 | pnc = pim_nexthop_cache_add(pimg, &rpf); |
d62a17ae | 173 | if (pnc) |
174 | pim_sendmsg_zebra_rnh(zclient, pnc, | |
175 | ZEBRA_NEXTHOP_REGISTER); | |
176 | else { | |
177 | char rpf_str[PREFIX_STRLEN]; | |
178 | pim_addr_dump("<nht-pnc?>", addr, rpf_str, | |
179 | sizeof(rpf_str)); | |
180 | zlog_warn("%s: pnc node allocation failed. addr %s ", | |
181 | __PRETTY_FUNCTION__, rpf_str); | |
cb9c7c50 | 182 | return 0; |
d62a17ae | 183 | } |
184 | } | |
185 | ||
186 | if (rp != NULL) { | |
187 | ch_node = listnode_lookup(pnc->rp_list, rp); | |
188 | if (ch_node == NULL) { | |
189 | if (PIM_DEBUG_ZEBRA) { | |
190 | char rp_str[PREFIX_STRLEN]; | |
191 | pim_addr_dump("<rp?>", &rp->rp.rpf_addr, rp_str, | |
192 | sizeof(rp_str)); | |
193 | zlog_debug( | |
194 | "%s: Add RP %s node to pnc cached list", | |
195 | __PRETTY_FUNCTION__, rp_str); | |
196 | } | |
197 | listnode_add_sort(pnc->rp_list, rp); | |
198 | } | |
199 | } | |
200 | ||
201 | if (up != NULL) { | |
202 | ch_node = listnode_lookup(pnc->upstream_list, up); | |
203 | if (ch_node == NULL) { | |
204 | if (PIM_DEBUG_ZEBRA) { | |
205 | char buf[PREFIX2STR_BUFFER]; | |
206 | prefix2str(addr, buf, sizeof(buf)); | |
207 | zlog_debug( | |
208 | "%s: Add upstream %s node to pnc cached list, rpf %s", | |
209 | __PRETTY_FUNCTION__, up->sg_str, buf); | |
210 | } | |
211 | listnode_add_sort(pnc->upstream_list, up); | |
212 | } | |
213 | } | |
214 | ||
215 | if (pnc && CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) { | |
216 | memcpy(out_pnc, pnc, sizeof(struct pim_nexthop_cache)); | |
217 | return 1; | |
218 | } | |
219 | ||
220 | return 0; | |
1bc98276 CS |
221 | } |
222 | ||
d0a4f55d DS |
223 | void pim_delete_tracked_nexthop(struct pim_instance *pim, struct prefix *addr, |
224 | struct pim_upstream *up, struct rp_info *rp) | |
1bc98276 | 225 | { |
d62a17ae | 226 | struct pim_nexthop_cache *pnc = NULL; |
227 | struct pim_nexthop_cache lookup; | |
228 | struct zclient *zclient = NULL; | |
229 | ||
230 | zclient = pim_zebra_zclient_get(); | |
231 | ||
232 | /* Remove from RPF hash if it is the last entry */ | |
233 | lookup.rpf.rpf_addr = *addr; | |
d0a4f55d | 234 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
d62a17ae | 235 | if (pnc) { |
236 | if (rp) | |
237 | listnode_delete(pnc->rp_list, rp); | |
238 | if (up) | |
239 | listnode_delete(pnc->upstream_list, up); | |
240 | ||
241 | if (PIM_DEBUG_ZEBRA) | |
242 | zlog_debug( | |
243 | "%s: NHT rp_list count:%d upstream_list count:%d ", | |
244 | __PRETTY_FUNCTION__, pnc->rp_list->count, | |
245 | pnc->upstream_list->count); | |
246 | ||
247 | if (pnc->rp_list->count == 0 | |
248 | && pnc->upstream_list->count == 0) { | |
249 | pim_sendmsg_zebra_rnh(zclient, pnc, | |
250 | ZEBRA_NEXTHOP_UNREGISTER); | |
251 | ||
252 | list_delete(pnc->rp_list); | |
253 | list_delete(pnc->upstream_list); | |
254 | ||
d0a4f55d | 255 | hash_release(pim->rpf_hash, pnc); |
d62a17ae | 256 | if (pnc->nexthop) |
257 | nexthops_free(pnc->nexthop); | |
258 | XFREE(MTYPE_PIM_NEXTHOP_CACHE, pnc); | |
259 | } | |
260 | } | |
1bc98276 CS |
261 | } |
262 | ||
263 | /* Update RP nexthop info based on Nexthop update received from Zebra.*/ | |
d62a17ae | 264 | int pim_update_rp_nh(struct pim_nexthop_cache *pnc) |
1bc98276 | 265 | { |
d62a17ae | 266 | struct listnode *node = NULL; |
267 | struct rp_info *rp_info = NULL; | |
268 | int ret = 0; | |
269 | ||
270 | /*Traverse RP list and update each RP Nexthop info */ | |
271 | for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) { | |
272 | if (rp_info->rp.rpf_addr.u.prefix4.s_addr == INADDR_NONE) | |
273 | continue; | |
274 | ||
275 | // Compute PIM RPF using cached nexthop | |
276 | ret = pim_ecmp_nexthop_search(pnc, &rp_info->rp.source_nexthop, | |
277 | &rp_info->rp.rpf_addr, | |
278 | &rp_info->group, 1); | |
279 | ||
280 | if (PIM_DEBUG_TRACE) { | |
281 | char rp_str[PREFIX_STRLEN]; | |
282 | pim_addr_dump("<rp?>", &rp_info->rp.rpf_addr, rp_str, | |
283 | sizeof(rp_str)); | |
284 | zlog_debug( | |
285 | "%s: NHT update, nexthop for RP %s is interface %s ", | |
286 | __PRETTY_FUNCTION__, rp_str, | |
287 | rp_info->rp.source_nexthop.interface->name); | |
288 | } | |
289 | } | |
290 | ||
291 | if (ret) | |
292 | return 0; | |
293 | ||
294 | return 1; | |
1bc98276 CS |
295 | } |
296 | ||
633988a7 CS |
297 | /* This API is used to traverse nexthop cache of RPF addr |
298 | of upstream entry whose IPv4 nexthop address is in | |
299 | unresolved state and due to event like pim neighbor | |
300 | UP event if it can be resolved. | |
301 | */ | |
d62a17ae | 302 | void pim_resolve_upstream_nh(struct prefix *nht_p) |
633988a7 | 303 | { |
d62a17ae | 304 | struct nexthop *nh_node = NULL; |
305 | struct pim_nexthop_cache pnc; | |
306 | struct pim_neighbor *nbr = NULL; | |
307 | ||
308 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
cb9c7c50 DS |
309 | if (!pim_find_or_track_nexthop(nht_p, NULL, NULL, &pnc)) |
310 | return; | |
311 | ||
312 | for (nh_node = pnc.nexthop; nh_node; nh_node = nh_node->next) { | |
313 | if (nh_node->gate.ipv4.s_addr != 0) | |
314 | continue; | |
315 | ||
316 | struct interface *ifp1 = | |
317 | if_lookup_by_index(nh_node->ifindex, pimg->vrf_id); | |
318 | nbr = pim_neighbor_find_if(ifp1); | |
319 | if (!nbr) | |
320 | continue; | |
321 | ||
322 | nh_node->gate.ipv4 = nbr->source_addr; | |
323 | if (PIM_DEBUG_TRACE) { | |
324 | char str[PREFIX_STRLEN]; | |
325 | char str1[INET_ADDRSTRLEN]; | |
326 | pim_inet4_dump("<nht_nbr?>", nbr->source_addr, str1, | |
327 | sizeof(str1)); | |
328 | pim_addr_dump("<nht_addr?>", nht_p, str, sizeof(str)); | |
329 | zlog_debug( | |
330 | "%s: addr %s new nexthop addr %s interface %s", | |
331 | __PRETTY_FUNCTION__, str, str1, ifp1->name); | |
d62a17ae | 332 | } |
333 | } | |
633988a7 CS |
334 | } |
335 | ||
1bc98276 | 336 | /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/ |
d62a17ae | 337 | static int pim_update_upstream_nh(struct pim_nexthop_cache *pnc) |
1bc98276 | 338 | { |
d62a17ae | 339 | struct listnode *up_node; |
340 | struct listnode *ifnode; | |
341 | struct listnode *up_nextnode; | |
342 | struct listnode *node; | |
343 | struct pim_upstream *up = NULL; | |
344 | struct interface *ifp = NULL; | |
345 | int vif_index = 0; | |
346 | ||
347 | for (ALL_LIST_ELEMENTS(pnc->upstream_list, up_node, up_nextnode, up)) { | |
348 | enum pim_rpf_result rpf_result; | |
349 | struct pim_rpf old; | |
350 | ||
351 | old.source_nexthop.interface = up->rpf.source_nexthop.interface; | |
352 | rpf_result = pim_rpf_update(up, &old, 0); | |
353 | if (rpf_result == PIM_RPF_FAILURE) | |
354 | continue; | |
355 | ||
356 | /* update kernel multicast forwarding cache (MFC) */ | |
357 | if (up->channel_oil) { | |
358 | ifindex_t ifindex = | |
359 | up->rpf.source_nexthop.interface->ifindex; | |
360 | vif_index = pim_if_find_vifindex_by_ifindex(ifindex); | |
361 | /* Pass Current selected NH vif index to mroute download | |
362 | */ | |
363 | if (vif_index) | |
364 | pim_scan_individual_oil(up->channel_oil, | |
365 | vif_index); | |
366 | else { | |
367 | if (PIM_DEBUG_ZEBRA) | |
368 | zlog_debug( | |
369 | "%s: NHT upstream %s channel_oil IIF %s vif_index is not valid", | |
370 | __PRETTY_FUNCTION__, up->sg_str, | |
371 | up->rpf.source_nexthop | |
372 | .interface->name); | |
373 | } | |
374 | } | |
375 | ||
376 | if (rpf_result == PIM_RPF_CHANGED) { | |
377 | struct pim_neighbor *nbr; | |
378 | ||
379 | nbr = pim_neighbor_find(old.source_nexthop.interface, | |
380 | old.rpf_addr.u.prefix4); | |
381 | if (nbr) | |
382 | pim_jp_agg_remove_group(nbr->upstream_jp_agg, | |
383 | up); | |
384 | ||
385 | /* | |
386 | * We have detected a case where we might need to rescan | |
387 | * the inherited o_list so do it. | |
388 | */ | |
389 | if (up->channel_oil | |
390 | && up->channel_oil->oil_inherited_rescan) { | |
391 | pim_upstream_inherited_olist_decide(up); | |
392 | up->channel_oil->oil_inherited_rescan = 0; | |
393 | } | |
394 | ||
395 | if (up->join_state == PIM_UPSTREAM_JOINED) { | |
396 | /* | |
397 | * If we come up real fast we can be here | |
398 | * where the mroute has not been installed | |
399 | * so install it. | |
400 | */ | |
401 | if (up->channel_oil | |
402 | && !up->channel_oil->installed) | |
403 | pim_mroute_add(up->channel_oil, | |
404 | __PRETTY_FUNCTION__); | |
405 | ||
406 | /* | |
407 | RFC 4601: 4.5.7. Sending (S,G) Join/Prune | |
408 | Messages | |
409 | ||
410 | Transitions from Joined State | |
411 | ||
412 | RPF'(S,G) changes not due to an Assert | |
413 | ||
414 | The upstream (S,G) state machine remains in | |
415 | Joined | |
416 | state. Send Join(S,G) to the new upstream | |
417 | neighbor, which is | |
418 | the new value of RPF'(S,G). Send Prune(S,G) | |
419 | to the old | |
420 | upstream neighbor, which is the old value of | |
421 | RPF'(S,G). Set | |
422 | the Join Timer (JT) to expire after | |
423 | t_periodic seconds. | |
424 | */ | |
425 | pim_jp_agg_switch_interface(&old, &up->rpf, up); | |
426 | ||
427 | pim_upstream_join_timer_restart(up, &old); | |
428 | } /* up->join_state == PIM_UPSTREAM_JOINED */ | |
429 | ||
430 | /* FIXME can join_desired actually be changed by | |
431 | pim_rpf_update() | |
432 | returning PIM_RPF_CHANGED ? */ | |
433 | pim_upstream_update_join_desired(up); | |
434 | ||
435 | } /* PIM_RPF_CHANGED */ | |
436 | ||
437 | if (PIM_DEBUG_TRACE) { | |
438 | zlog_debug("%s: NHT upstream %s old ifp %s new ifp %s", | |
439 | __PRETTY_FUNCTION__, up->sg_str, | |
440 | old.source_nexthop.interface->name, | |
441 | up->rpf.source_nexthop.interface->name); | |
442 | } | |
443 | } /* for (pnc->upstream_list) */ | |
444 | ||
0708beb1 | 445 | for (ALL_LIST_ELEMENTS_RO(vrf_iflist(pimg->vrf_id), ifnode, ifp)) |
d62a17ae | 446 | if (ifp->info) { |
447 | struct pim_interface *pim_ifp = ifp->info; | |
448 | struct pim_iface_upstream_switch *us; | |
449 | ||
450 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->upstream_switch_list, | |
451 | node, us)) { | |
452 | struct pim_rpf rpf; | |
453 | rpf.source_nexthop.interface = ifp; | |
454 | rpf.rpf_addr.u.prefix4 = us->address; | |
455 | pim_joinprune_send(&rpf, us->us); | |
456 | pim_jp_agg_clear_group(us->us); | |
457 | } | |
458 | } | |
459 | ||
460 | return 0; | |
1bc98276 CS |
461 | } |
462 | ||
d62a17ae | 463 | uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp) |
633988a7 | 464 | { |
d62a17ae | 465 | uint32_t hash_val; |
466 | uint32_t s = 0, g = 0; | |
467 | ||
468 | if ((!src)) | |
469 | return 0; | |
470 | ||
471 | switch (src->family) { | |
472 | case AF_INET: { | |
473 | s = src->u.prefix4.s_addr; | |
474 | s = s == 0 ? 1 : s; | |
475 | if (grp) | |
476 | g = grp->u.prefix4.s_addr; | |
477 | } break; | |
478 | default: | |
479 | break; | |
480 | } | |
481 | ||
482 | hash_val = jhash_2words(g, s, 101); | |
483 | if (PIM_DEBUG_PIM_TRACE_DETAIL) { | |
484 | char buf[PREFIX2STR_BUFFER]; | |
485 | char bufg[PREFIX2STR_BUFFER]; | |
486 | prefix2str(src, buf, sizeof(buf)); | |
487 | if (grp) | |
488 | prefix2str(grp, bufg, sizeof(bufg)); | |
489 | zlog_debug("%s: addr %s %s hash_val %u", __PRETTY_FUNCTION__, | |
490 | buf, grp ? bufg : "", hash_val); | |
491 | } | |
492 | return hash_val; | |
633988a7 CS |
493 | } |
494 | ||
d62a17ae | 495 | int pim_ecmp_nexthop_search(struct pim_nexthop_cache *pnc, |
496 | struct pim_nexthop *nexthop, struct prefix *src, | |
497 | struct prefix *grp, int neighbor_needed) | |
633988a7 | 498 | { |
d62a17ae | 499 | struct pim_neighbor *nbr = NULL; |
500 | struct nexthop *nh_node = NULL; | |
501 | ifindex_t first_ifindex; | |
502 | struct interface *ifp = NULL; | |
503 | uint32_t hash_val = 0, mod_val = 0; | |
504 | uint8_t nh_iter = 0, found = 0; | |
505 | ||
506 | if (!pnc || !pnc->nexthop_num || !nexthop) | |
cb9c7c50 | 507 | return 0; |
d62a17ae | 508 | |
509 | // Current Nexthop is VALID, check to stay on the current path. | |
510 | if (nexthop->interface && nexthop->interface->info | |
511 | && nexthop->mrib_nexthop_addr.u.prefix4.s_addr | |
512 | != PIM_NET_INADDR_ANY) { | |
513 | /* User configured knob to explicitly switch | |
514 | to new path is disabled or current path | |
515 | metric is less than nexthop update. | |
516 | */ | |
517 | ||
518 | if (qpim_ecmp_rebalance_enable == 0) { | |
519 | uint8_t curr_route_valid = 0; | |
520 | // Check if current nexthop is present in new updated | |
521 | // Nexthop list. | |
522 | // If the current nexthop is not valid, candidate to | |
523 | // choose new Nexthop. | |
524 | for (nh_node = pnc->nexthop; nh_node; | |
525 | nh_node = nh_node->next) | |
526 | curr_route_valid = (nexthop->interface->ifindex | |
527 | == nh_node->ifindex); | |
528 | ||
529 | if (curr_route_valid | |
530 | && !pim_if_connected_to_source(nexthop->interface, | |
531 | src->u.prefix4)) { | |
532 | nbr = pim_neighbor_find( | |
533 | nexthop->interface, | |
534 | nexthop->mrib_nexthop_addr.u.prefix4); | |
535 | if (!nbr | |
536 | && !if_is_loopback(nexthop->interface)) { | |
537 | if (PIM_DEBUG_TRACE) | |
538 | zlog_debug( | |
539 | "%s: current nexthop does not have nbr ", | |
540 | __PRETTY_FUNCTION__); | |
541 | } else { | |
542 | if (PIM_DEBUG_TRACE) { | |
543 | char src_str[INET_ADDRSTRLEN]; | |
544 | pim_inet4_dump("<addr?>", | |
545 | src->u.prefix4, | |
546 | src_str, | |
547 | sizeof(src_str)); | |
548 | char grp_str[INET_ADDRSTRLEN]; | |
549 | pim_inet4_dump("<addr?>", | |
550 | grp->u.prefix4, | |
551 | grp_str, | |
552 | sizeof(grp_str)); | |
553 | zlog_debug( | |
554 | "%s: (%s, %s) current nexthop %s is valid, skipping new path selection", | |
555 | __PRETTY_FUNCTION__, | |
556 | src_str, grp_str, | |
557 | nexthop->interface->name); | |
558 | } | |
559 | return 0; | |
560 | } | |
561 | } | |
562 | } | |
563 | } | |
564 | if (qpim_ecmp_enable) { | |
565 | // PIM ECMP flag is enable then choose ECMP path. | |
566 | hash_val = pim_compute_ecmp_hash(src, grp); | |
567 | mod_val = hash_val % pnc->nexthop_num; | |
568 | if (PIM_DEBUG_PIM_TRACE_DETAIL) | |
569 | zlog_debug("%s: hash_val %u mod_val %u ", | |
570 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
571 | } | |
572 | ||
573 | for (nh_node = pnc->nexthop; nh_node && (found == 0); | |
574 | nh_node = nh_node->next) { | |
575 | first_ifindex = nh_node->ifindex; | |
0708beb1 | 576 | ifp = if_lookup_by_index(first_ifindex, pimg->vrf_id); |
d62a17ae | 577 | if (!ifp) { |
578 | if (PIM_DEBUG_ZEBRA) { | |
579 | char addr_str[INET_ADDRSTRLEN]; | |
580 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
581 | addr_str, sizeof(addr_str)); | |
582 | zlog_debug( | |
583 | "%s %s: could not find interface for ifindex %d (address %s)", | |
584 | __FILE__, __PRETTY_FUNCTION__, | |
585 | first_ifindex, addr_str); | |
586 | } | |
587 | if (nh_iter == mod_val) | |
588 | mod_val++; // Select nexthpath | |
589 | nh_iter++; | |
590 | continue; | |
591 | } | |
592 | if (!ifp->info) { | |
593 | if (PIM_DEBUG_ZEBRA) { | |
594 | char addr_str[INET_ADDRSTRLEN]; | |
595 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
596 | addr_str, sizeof(addr_str)); | |
597 | zlog_debug( | |
598 | "%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)", | |
599 | __PRETTY_FUNCTION__, ifp->name, | |
600 | first_ifindex, addr_str); | |
601 | } | |
602 | if (nh_iter == mod_val) | |
603 | mod_val++; // Select nexthpath | |
604 | nh_iter++; | |
605 | continue; | |
606 | } | |
607 | ||
608 | if (neighbor_needed | |
609 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
610 | nbr = pim_neighbor_find(ifp, nh_node->gate.ipv4); | |
611 | if (PIM_DEBUG_PIM_TRACE_DETAIL) | |
612 | zlog_debug("ifp name: %s, pim nbr: %p", | |
613 | ifp->name, nbr); | |
614 | if (!nbr && !if_is_loopback(ifp)) { | |
615 | if (PIM_DEBUG_ZEBRA) | |
616 | zlog_debug( | |
617 | "%s: pim nbr not found on input interface %s", | |
618 | __PRETTY_FUNCTION__, ifp->name); | |
619 | if (nh_iter == mod_val) | |
620 | mod_val++; // Select nexthpath | |
621 | nh_iter++; | |
622 | continue; | |
623 | } | |
624 | } | |
625 | ||
626 | if (nh_iter == mod_val) { | |
627 | nexthop->interface = ifp; | |
628 | nexthop->mrib_nexthop_addr.family = AF_INET; | |
629 | nexthop->mrib_nexthop_addr.prefixlen = IPV4_MAX_BITLEN; | |
630 | nexthop->mrib_nexthop_addr.u.prefix4 = | |
631 | nh_node->gate.ipv4; | |
632 | nexthop->mrib_metric_preference = pnc->distance; | |
633 | nexthop->mrib_route_metric = pnc->metric; | |
634 | nexthop->last_lookup = src->u.prefix4; | |
635 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
636 | nexthop->nbr = nbr; | |
637 | found = 1; | |
638 | if (PIM_DEBUG_ZEBRA) { | |
639 | char buf[INET_ADDRSTRLEN]; | |
640 | char buf2[INET_ADDRSTRLEN]; | |
641 | char buf3[INET_ADDRSTRLEN]; | |
642 | pim_inet4_dump("<src?>", src->u.prefix4, buf2, | |
643 | sizeof(buf2)); | |
644 | pim_inet4_dump("<grp?>", grp->u.prefix4, buf3, | |
645 | sizeof(buf3)); | |
646 | pim_inet4_dump( | |
647 | "<rpf?>", | |
648 | nexthop->mrib_nexthop_addr.u.prefix4, | |
649 | buf, sizeof(buf)); | |
650 | zlog_debug( | |
651 | "%s: (%s, %s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d", | |
652 | __PRETTY_FUNCTION__, buf2, buf3, | |
653 | ifp->name, buf, mod_val, nh_iter, | |
654 | qpim_ecmp_enable); | |
655 | } | |
656 | } | |
657 | nh_iter++; | |
658 | } | |
659 | ||
660 | if (found) | |
cb9c7c50 | 661 | return 1; |
d62a17ae | 662 | else |
cb9c7c50 | 663 | return 0; |
633988a7 CS |
664 | } |
665 | ||
d62a17ae | 666 | /* This API is used to parse Registered address nexthop update coming from Zebra |
667 | */ | |
668 | int pim_parse_nexthop_update(int command, struct zclient *zclient, | |
669 | zebra_size_t length, vrf_id_t vrf_id) | |
1bc98276 | 670 | { |
d62a17ae | 671 | struct stream *s; |
672 | struct prefix p; | |
673 | struct nexthop *nexthop; | |
674 | struct nexthop *nhlist_head = NULL; | |
675 | struct nexthop *nhlist_tail = NULL; | |
676 | uint32_t metric, distance; | |
677 | u_char nexthop_num = 0; | |
678 | int i; | |
679 | struct pim_rpf rpf; | |
680 | struct pim_nexthop_cache *pnc = NULL; | |
681 | struct pim_neighbor *nbr = NULL; | |
682 | struct interface *ifp = NULL; | |
683 | struct interface *ifp1 = NULL; | |
684 | struct pim_interface *pim_ifp = NULL; | |
685 | char str[INET_ADDRSTRLEN]; | |
686 | ||
687 | s = zclient->ibuf; | |
688 | memset(&p, 0, sizeof(struct prefix)); | |
689 | p.family = stream_getw(s); | |
690 | p.prefixlen = stream_getc(s); | |
691 | switch (p.family) { | |
692 | case AF_INET: | |
693 | p.u.prefix4.s_addr = stream_get_ipv4(s); | |
694 | break; | |
695 | case AF_INET6: | |
696 | stream_get(&p.u.prefix6, s, 16); | |
697 | break; | |
698 | default: | |
699 | break; | |
700 | } | |
701 | ||
702 | if (command == ZEBRA_NEXTHOP_UPDATE) { | |
703 | rpf.rpf_addr.family = p.family; | |
704 | rpf.rpf_addr.prefixlen = p.prefixlen; | |
705 | rpf.rpf_addr.u.prefix4.s_addr = p.u.prefix4.s_addr; | |
d0a4f55d | 706 | pnc = pim_nexthop_cache_find(pimg, &rpf); |
d62a17ae | 707 | if (!pnc) { |
708 | if (PIM_DEBUG_TRACE) { | |
709 | char buf[PREFIX2STR_BUFFER]; | |
710 | prefix2str(&rpf.rpf_addr, buf, sizeof(buf)); | |
711 | zlog_debug( | |
712 | "%s: Skipping NHT update, addr %s is not in local cached DB.", | |
713 | __PRETTY_FUNCTION__, buf); | |
714 | } | |
715 | return 0; | |
716 | } | |
717 | } else { | |
718 | /* | |
719 | * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE | |
720 | */ | |
721 | return 0; | |
722 | } | |
723 | ||
724 | pnc->last_update = pim_time_monotonic_usec(); | |
725 | distance = stream_getc(s); | |
726 | metric = stream_getl(s); | |
727 | nexthop_num = stream_getc(s); | |
728 | ||
729 | if (nexthop_num) { | |
730 | pnc->nexthop_num = 0; // Only increment for pim enabled rpf. | |
731 | ||
732 | for (i = 0; i < nexthop_num; i++) { | |
733 | nexthop = nexthop_new(); | |
734 | nexthop->type = stream_getc(s); | |
735 | switch (nexthop->type) { | |
736 | case NEXTHOP_TYPE_IPV4: | |
737 | nexthop->gate.ipv4.s_addr = stream_get_ipv4(s); | |
738 | nexthop->ifindex = stream_getl(s); | |
739 | break; | |
740 | case NEXTHOP_TYPE_IFINDEX: | |
741 | nexthop->ifindex = stream_getl(s); | |
742 | break; | |
743 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
744 | nexthop->gate.ipv4.s_addr = stream_get_ipv4(s); | |
745 | nexthop->ifindex = stream_getl(s); | |
746 | break; | |
747 | case NEXTHOP_TYPE_IPV6: | |
748 | stream_get(&nexthop->gate.ipv6, s, 16); | |
749 | break; | |
750 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
751 | stream_get(&nexthop->gate.ipv6, s, 16); | |
752 | nexthop->ifindex = stream_getl(s); | |
753 | ifp1 = if_lookup_by_index(nexthop->ifindex, | |
0708beb1 | 754 | pimg->vrf_id); |
d62a17ae | 755 | nbr = pim_neighbor_find_if(ifp1); |
756 | /* Overwrite with Nbr address as NH addr */ | |
757 | if (nbr) { | |
758 | nexthop->gate.ipv4 = nbr->source_addr; | |
759 | if (PIM_DEBUG_TRACE) { | |
760 | pim_inet4_dump("<nht_nbr?>", | |
761 | nbr->source_addr, | |
762 | str, | |
763 | sizeof(str)); | |
764 | zlog_debug( | |
765 | "%s: NHT using pim nbr addr %s interface %s as rpf", | |
766 | __PRETTY_FUNCTION__, | |
767 | str, ifp1->name); | |
768 | } | |
769 | } else { | |
770 | if (PIM_DEBUG_TRACE) { | |
771 | pim_ifp = ifp1->info; | |
772 | zlog_debug( | |
773 | "%s: NHT pim nbr not found on interface %s nbr count:%d ", | |
774 | __PRETTY_FUNCTION__, | |
775 | ifp1->name, | |
776 | pim_ifp->pim_neighbor_list | |
777 | ->count); | |
778 | } | |
779 | // Mark nexthop address to 0 until PIM | |
780 | // Nbr is resolved. | |
781 | nexthop->gate.ipv4.s_addr = | |
782 | PIM_NET_INADDR_ANY; | |
783 | } | |
784 | ||
785 | break; | |
786 | default: | |
787 | /* do nothing */ | |
788 | break; | |
789 | } | |
790 | ||
791 | if (PIM_DEBUG_TRACE) { | |
792 | char p_str[PREFIX2STR_BUFFER]; | |
793 | prefix2str(&p, p_str, sizeof(p_str)); | |
794 | zlog_debug( | |
795 | "%s: NHT addr %s %d-nhop via %s type %d distance:%u metric:%u ", | |
796 | __PRETTY_FUNCTION__, p_str, i + 1, | |
797 | inet_ntoa(nexthop->gate.ipv4), | |
798 | nexthop->type, distance, metric); | |
799 | } | |
800 | ||
0708beb1 DS |
801 | ifp = if_lookup_by_index(nexthop->ifindex, |
802 | pimg->vrf_id); | |
d62a17ae | 803 | if (!ifp) { |
804 | if (PIM_DEBUG_ZEBRA) { | |
805 | char buf[NEXTHOP_STRLEN]; | |
806 | zlog_debug( | |
807 | "%s: could not find interface for ifindex %d (addr %s)", | |
808 | __PRETTY_FUNCTION__, | |
809 | nexthop->ifindex, | |
810 | nexthop2str(nexthop, buf, | |
811 | sizeof(buf))); | |
812 | } | |
813 | nexthop_free(nexthop); | |
814 | continue; | |
815 | } | |
816 | ||
817 | if (!ifp->info) { | |
818 | if (PIM_DEBUG_ZEBRA) { | |
819 | char buf[NEXTHOP_STRLEN]; | |
820 | zlog_debug( | |
821 | "%s: multicast not enabled on input interface %s (ifindex=%d, addr %s)", | |
822 | __PRETTY_FUNCTION__, ifp->name, | |
823 | nexthop->ifindex, | |
824 | nexthop2str(nexthop, buf, | |
825 | sizeof(buf))); | |
826 | } | |
827 | nexthop_free(nexthop); | |
828 | continue; | |
829 | } | |
830 | ||
831 | if (nhlist_tail) { | |
832 | nhlist_tail->next = nexthop; | |
833 | nhlist_tail = nexthop; | |
834 | } else { | |
835 | nhlist_tail = nexthop; | |
836 | nhlist_head = nexthop; | |
837 | } | |
838 | // Only keep track of nexthops which are PIM enabled. | |
839 | pnc->nexthop_num++; | |
840 | } | |
841 | /* Reset existing pnc->nexthop before assigning new list */ | |
842 | nexthops_free(pnc->nexthop); | |
843 | pnc->nexthop = nhlist_head; | |
844 | if (pnc->nexthop_num) { | |
845 | pnc->flags |= PIM_NEXTHOP_VALID; | |
846 | pnc->distance = distance; | |
847 | pnc->metric = metric; | |
848 | } | |
849 | } else { | |
850 | pnc->flags &= ~PIM_NEXTHOP_VALID; | |
851 | pnc->nexthop_num = nexthop_num; | |
852 | nexthops_free(pnc->nexthop); | |
853 | pnc->nexthop = NULL; | |
854 | } | |
855 | ||
856 | if (PIM_DEBUG_TRACE) { | |
857 | char buf[PREFIX2STR_BUFFER]; | |
858 | prefix2str(&p, buf, sizeof(buf)); | |
859 | zlog_debug( | |
860 | "%s: NHT Update for %s num_nh %d num_pim_nh %d vrf:%d up %d rp %d", | |
861 | __PRETTY_FUNCTION__, buf, nexthop_num, pnc->nexthop_num, | |
862 | vrf_id, listcount(pnc->upstream_list), | |
863 | listcount(pnc->rp_list)); | |
864 | } | |
865 | ||
866 | pim_rpf_set_refresh_time(); | |
867 | ||
868 | if (listcount(pnc->rp_list)) | |
869 | pim_update_rp_nh(pnc); | |
870 | if (listcount(pnc->upstream_list)) | |
871 | pim_update_upstream_nh(pnc); | |
872 | ||
873 | return 0; | |
1bc98276 | 874 | } |
633988a7 | 875 | |
d62a17ae | 876 | int pim_ecmp_nexthop_lookup(struct pim_nexthop *nexthop, struct in_addr addr, |
877 | struct prefix *src, struct prefix *grp, | |
878 | int neighbor_needed) | |
633988a7 | 879 | { |
d62a17ae | 880 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
881 | struct pim_neighbor *nbr = NULL; | |
882 | int num_ifindex; | |
883 | struct interface *ifp; | |
884 | int first_ifindex; | |
885 | int found = 0; | |
886 | uint8_t i = 0; | |
887 | uint32_t hash_val = 0, mod_val = 0; | |
888 | ||
889 | if (PIM_DEBUG_TRACE) { | |
890 | char addr_str[INET_ADDRSTRLEN]; | |
891 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
892 | zlog_debug("%s: Looking up: %s, last lookup time: %lld", | |
893 | __PRETTY_FUNCTION__, addr_str, | |
894 | nexthop->last_lookup_time); | |
895 | } | |
896 | ||
897 | memset(nexthop_tab, 0, | |
898 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
899 | num_ifindex = zclient_lookup_nexthop(nexthop_tab, MULTIPATH_NUM, addr, | |
900 | PIM_NEXTHOP_LOOKUP_MAX); | |
901 | if (num_ifindex < 1) { | |
902 | char addr_str[INET_ADDRSTRLEN]; | |
903 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
904 | zlog_warn( | |
905 | "%s %s: could not find nexthop ifindex for address %s", | |
906 | __FILE__, __PRETTY_FUNCTION__, addr_str); | |
cb9c7c50 | 907 | return 0; |
d62a17ae | 908 | } |
909 | ||
910 | // If PIM ECMP enable then choose ECMP path. | |
911 | if (qpim_ecmp_enable) { | |
912 | hash_val = pim_compute_ecmp_hash(src, grp); | |
913 | mod_val = hash_val % num_ifindex; | |
914 | if (PIM_DEBUG_PIM_TRACE_DETAIL) | |
915 | zlog_debug("%s: hash_val %u mod_val %u", | |
916 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
917 | } | |
918 | ||
919 | while (!found && (i < num_ifindex)) { | |
920 | first_ifindex = nexthop_tab[i].ifindex; | |
921 | ||
0708beb1 | 922 | ifp = if_lookup_by_index(first_ifindex, pimg->vrf_id); |
d62a17ae | 923 | if (!ifp) { |
924 | if (PIM_DEBUG_ZEBRA) { | |
925 | char addr_str[INET_ADDRSTRLEN]; | |
926 | pim_inet4_dump("<addr?>", addr, addr_str, | |
927 | sizeof(addr_str)); | |
928 | zlog_debug( | |
929 | "%s %s: could not find interface for ifindex %d (address %s)", | |
930 | __FILE__, __PRETTY_FUNCTION__, | |
931 | first_ifindex, addr_str); | |
932 | } | |
933 | if (i == mod_val) | |
934 | mod_val++; | |
935 | i++; | |
936 | continue; | |
937 | } | |
938 | ||
939 | if (!ifp->info) { | |
940 | if (PIM_DEBUG_ZEBRA) { | |
941 | char addr_str[INET_ADDRSTRLEN]; | |
942 | pim_inet4_dump("<addr?>", addr, addr_str, | |
943 | sizeof(addr_str)); | |
944 | zlog_debug( | |
945 | "%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)", | |
946 | __PRETTY_FUNCTION__, ifp->name, | |
947 | first_ifindex, addr_str); | |
948 | } | |
949 | if (i == mod_val) | |
950 | mod_val++; | |
951 | i++; | |
952 | continue; | |
953 | } | |
954 | if (neighbor_needed && !pim_if_connected_to_source(ifp, addr)) { | |
955 | nbr = pim_neighbor_find( | |
956 | ifp, nexthop_tab[i].nexthop_addr.u.prefix4); | |
957 | if (PIM_DEBUG_PIM_TRACE_DETAIL) | |
958 | zlog_debug("ifp name: %s, pim nbr: %p", | |
959 | ifp->name, nbr); | |
960 | if (!nbr && !if_is_loopback(ifp)) { | |
961 | if (i == mod_val) | |
962 | mod_val++; | |
963 | i++; | |
964 | if (PIM_DEBUG_ZEBRA) { | |
965 | char addr_str[INET_ADDRSTRLEN]; | |
966 | pim_inet4_dump("<addr?>", addr, | |
967 | addr_str, | |
968 | sizeof(addr_str)); | |
969 | zlog_debug( | |
970 | "%s: NBR not found on input interface %s (RPF for source %s)", | |
971 | __PRETTY_FUNCTION__, ifp->name, | |
972 | addr_str); | |
973 | } | |
974 | continue; | |
975 | } | |
976 | } | |
977 | ||
978 | if (i == mod_val) { | |
979 | if (PIM_DEBUG_ZEBRA) { | |
980 | char nexthop_str[PREFIX_STRLEN]; | |
981 | char addr_str[INET_ADDRSTRLEN]; | |
982 | pim_addr_dump("<nexthop?>", | |
983 | &nexthop_tab[i].nexthop_addr, | |
984 | nexthop_str, sizeof(nexthop_str)); | |
985 | pim_inet4_dump("<addr?>", addr, addr_str, | |
986 | sizeof(addr_str)); | |
987 | zlog_debug( | |
988 | "%s %s: found nhop %s for addr %s interface %s metric %d dist %d", | |
989 | __FILE__, __PRETTY_FUNCTION__, | |
990 | nexthop_str, addr_str, ifp->name, | |
991 | nexthop_tab[i].route_metric, | |
992 | nexthop_tab[i].protocol_distance); | |
993 | } | |
994 | /* update nextop data */ | |
995 | nexthop->interface = ifp; | |
996 | nexthop->mrib_nexthop_addr = | |
997 | nexthop_tab[i].nexthop_addr; | |
998 | nexthop->mrib_metric_preference = | |
999 | nexthop_tab[i].protocol_distance; | |
1000 | nexthop->mrib_route_metric = | |
1001 | nexthop_tab[i].route_metric; | |
1002 | nexthop->last_lookup = addr; | |
1003 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
1004 | nexthop->nbr = nbr; | |
1005 | found = 1; | |
1006 | } | |
1007 | i++; | |
1008 | } | |
cb9c7c50 | 1009 | |
d62a17ae | 1010 | if (found) |
cb9c7c50 | 1011 | return 1; |
d62a17ae | 1012 | else |
cb9c7c50 | 1013 | return 0; |
633988a7 | 1014 | } |
815c33c9 | 1015 | |
d62a17ae | 1016 | int pim_ecmp_fib_lookup_if_vif_index(struct in_addr addr, struct prefix *src, |
1017 | struct prefix *grp) | |
815c33c9 | 1018 | { |
d62a17ae | 1019 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
1020 | int num_ifindex; | |
1021 | int vif_index; | |
1022 | ifindex_t first_ifindex; | |
1023 | uint32_t hash_val = 0, mod_val = 0; | |
1024 | ||
1025 | memset(nexthop_tab, 0, | |
1026 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
1027 | num_ifindex = zclient_lookup_nexthop(nexthop_tab, MULTIPATH_NUM, addr, | |
1028 | PIM_NEXTHOP_LOOKUP_MAX); | |
1029 | if (num_ifindex < 1) { | |
1030 | if (PIM_DEBUG_ZEBRA) { | |
1031 | char addr_str[INET_ADDRSTRLEN]; | |
1032 | pim_inet4_dump("<addr?>", addr, addr_str, | |
1033 | sizeof(addr_str)); | |
1034 | zlog_debug( | |
1035 | "%s %s: could not find nexthop ifindex for address %s", | |
1036 | __FILE__, __PRETTY_FUNCTION__, addr_str); | |
1037 | } | |
1038 | return -1; | |
1039 | } | |
1040 | ||
1041 | // If PIM ECMP enable then choose ECMP path. | |
1042 | if (qpim_ecmp_enable) { | |
1043 | hash_val = pim_compute_ecmp_hash(src, grp); | |
1044 | mod_val = hash_val % num_ifindex; | |
1045 | if (PIM_DEBUG_PIM_TRACE_DETAIL) | |
1046 | zlog_debug("%s: hash_val %u mod_val %u", | |
1047 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
1048 | } | |
1049 | ||
1050 | first_ifindex = nexthop_tab[mod_val].ifindex; | |
1051 | ||
1052 | if (PIM_DEBUG_ZEBRA) { | |
1053 | char addr_str[INET_ADDRSTRLEN]; | |
1054 | pim_inet4_dump("<ifaddr?>", addr, addr_str, sizeof(addr_str)); | |
1055 | zlog_debug( | |
1056 | "%s %s: found nexthop ifindex=%d (interface %s) for address %s", | |
1057 | __FILE__, __PRETTY_FUNCTION__, first_ifindex, | |
0708beb1 | 1058 | ifindex2ifname(first_ifindex, pimg->vrf_id), addr_str); |
d62a17ae | 1059 | } |
1060 | ||
1061 | vif_index = pim_if_find_vifindex_by_ifindex(first_ifindex); | |
1062 | ||
1063 | if (vif_index < 0) { | |
1064 | if (PIM_DEBUG_ZEBRA) { | |
1065 | char addr_str[INET_ADDRSTRLEN]; | |
1066 | pim_inet4_dump("<addr?>", addr, addr_str, | |
1067 | sizeof(addr_str)); | |
1068 | zlog_debug( | |
1069 | "%s %s: low vif_index=%d < 1 nexthop for address %s", | |
1070 | __FILE__, __PRETTY_FUNCTION__, vif_index, | |
1071 | addr_str); | |
1072 | } | |
1073 | return -2; | |
1074 | } | |
1075 | ||
1076 | return vif_index; | |
815c33c9 | 1077 | } |