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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 | */ | |
64c86530 | 47 | void pim_sendmsg_zebra_rnh(struct pim_instance *pim, struct zclient *zclient, |
d62a17ae | 48 | struct pim_nexthop_cache *pnc, int command) |
1bc98276 | 49 | { |
d62a17ae | 50 | struct prefix *p; |
51 | int ret; | |
52 | ||
d62a17ae | 53 | p = &(pnc->rpf.rpf_addr); |
3c192540 | 54 | ret = zclient_send_rnh(zclient, command, p, false, pim->vrf_id); |
d62a17ae | 55 | if (ret < 0) |
56 | zlog_warn("sendmsg_nexthop: zclient_send_message() failed"); | |
57 | ||
5cef40fc | 58 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 59 | char buf[PREFIX2STR_BUFFER]; |
60 | prefix2str(p, buf, sizeof(buf)); | |
5cef40fc DS |
61 | zlog_debug( |
62 | "%s: NHT %sregistered addr %s(%s) with Zebra ret:%d ", | |
63 | __PRETTY_FUNCTION__, | |
64 | (command == ZEBRA_NEXTHOP_REGISTER) ? " " : "de", buf, | |
65 | pim->vrf->name, ret); | |
d62a17ae | 66 | } |
67 | ||
68 | return; | |
1bc98276 CS |
69 | } |
70 | ||
d0a4f55d DS |
71 | struct pim_nexthop_cache *pim_nexthop_cache_find(struct pim_instance *pim, |
72 | struct pim_rpf *rpf) | |
1bc98276 | 73 | { |
d62a17ae | 74 | struct pim_nexthop_cache *pnc = NULL; |
75 | struct pim_nexthop_cache lookup; | |
1bc98276 | 76 | |
d62a17ae | 77 | lookup.rpf.rpf_addr.family = rpf->rpf_addr.family; |
78 | lookup.rpf.rpf_addr.prefixlen = rpf->rpf_addr.prefixlen; | |
79 | lookup.rpf.rpf_addr.u.prefix4.s_addr = rpf->rpf_addr.u.prefix4.s_addr; | |
1bc98276 | 80 | |
d0a4f55d | 81 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
1bc98276 | 82 | |
d62a17ae | 83 | return pnc; |
1bc98276 CS |
84 | } |
85 | ||
5cef40fc DS |
86 | static struct pim_nexthop_cache *pim_nexthop_cache_add(struct pim_instance *pim, |
87 | struct pim_rpf *rpf_addr) | |
1bc98276 | 88 | { |
d62a17ae | 89 | struct pim_nexthop_cache *pnc; |
9fb302f4 DS |
90 | char hash_name[64]; |
91 | char buf1[64]; | |
d62a17ae | 92 | |
93 | pnc = XCALLOC(MTYPE_PIM_NEXTHOP_CACHE, | |
94 | sizeof(struct pim_nexthop_cache)); | |
95 | if (!pnc) { | |
96 | zlog_err("%s: NHT PIM XCALLOC failure ", __PRETTY_FUNCTION__); | |
97 | return NULL; | |
98 | } | |
99 | pnc->rpf.rpf_addr.family = rpf_addr->rpf_addr.family; | |
100 | pnc->rpf.rpf_addr.prefixlen = rpf_addr->rpf_addr.prefixlen; | |
101 | pnc->rpf.rpf_addr.u.prefix4.s_addr = | |
102 | rpf_addr->rpf_addr.u.prefix4.s_addr; | |
103 | ||
d0a4f55d | 104 | pnc = hash_get(pim->rpf_hash, pnc, hash_alloc_intern); |
d62a17ae | 105 | |
106 | pnc->rp_list = list_new(); | |
107 | pnc->rp_list->cmp = pim_rp_list_cmp; | |
108 | ||
9fb302f4 | 109 | snprintf(hash_name, 64, "PNC %s(%s) Upstream Hash", |
996c9314 | 110 | prefix2str(&pnc->rpf.rpf_addr, buf1, 64), pim->vrf->name); |
7c591950 | 111 | pnc->upstream_hash = hash_create_size(8192, pim_upstream_hash_key, |
996c9314 | 112 | pim_upstream_equal, hash_name); |
d62a17ae | 113 | |
d62a17ae | 114 | return pnc; |
1bc98276 CS |
115 | } |
116 | ||
cb9c7c50 DS |
117 | /* |
118 | * pim_find_or_track_nexthop | |
119 | * | |
120 | * This API is used to Register an address with Zebra | |
121 | * | |
122 | * 1 -> Success | |
123 | * 0 -> Failure | |
124 | */ | |
25bdac42 DS |
125 | int pim_find_or_track_nexthop(struct pim_instance *pim, struct prefix *addr, |
126 | struct pim_upstream *up, struct rp_info *rp, | |
d62a17ae | 127 | struct pim_nexthop_cache *out_pnc) |
1bc98276 | 128 | { |
d62a17ae | 129 | struct pim_nexthop_cache *pnc = NULL; |
130 | struct pim_rpf rpf; | |
131 | struct listnode *ch_node = NULL; | |
132 | struct zclient *zclient = NULL; | |
133 | ||
134 | zclient = pim_zebra_zclient_get(); | |
135 | memset(&rpf, 0, sizeof(struct pim_rpf)); | |
136 | rpf.rpf_addr.family = addr->family; | |
137 | rpf.rpf_addr.prefixlen = addr->prefixlen; | |
138 | rpf.rpf_addr.u.prefix4 = addr->u.prefix4; | |
139 | ||
25bdac42 | 140 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 141 | if (!pnc) { |
25bdac42 | 142 | pnc = pim_nexthop_cache_add(pim, &rpf); |
5cef40fc | 143 | if (!pnc) { |
d62a17ae | 144 | char rpf_str[PREFIX_STRLEN]; |
145 | pim_addr_dump("<nht-pnc?>", addr, rpf_str, | |
146 | sizeof(rpf_str)); | |
147 | zlog_warn("%s: pnc node allocation failed. addr %s ", | |
148 | __PRETTY_FUNCTION__, rpf_str); | |
cb9c7c50 | 149 | return 0; |
d62a17ae | 150 | } |
5cef40fc DS |
151 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
152 | ZEBRA_NEXTHOP_REGISTER); | |
153 | if (PIM_DEBUG_PIM_NHT) { | |
154 | char buf[PREFIX2STR_BUFFER]; | |
155 | prefix2str(addr, buf, sizeof(buf)); | |
156 | zlog_debug( | |
157 | "%s: NHT cache and zebra notification added for %s(%s)", | |
158 | __PRETTY_FUNCTION__, buf, pim->vrf->name); | |
159 | } | |
d62a17ae | 160 | } |
161 | ||
162 | if (rp != NULL) { | |
163 | ch_node = listnode_lookup(pnc->rp_list, rp); | |
5cef40fc | 164 | if (ch_node == NULL) |
d62a17ae | 165 | listnode_add_sort(pnc->rp_list, rp); |
d62a17ae | 166 | } |
167 | ||
7c591950 | 168 | if (up != NULL) |
c31a793b | 169 | hash_get(pnc->upstream_hash, up, hash_alloc_intern); |
d62a17ae | 170 | |
171 | if (pnc && CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) { | |
172 | memcpy(out_pnc, pnc, sizeof(struct pim_nexthop_cache)); | |
173 | return 1; | |
174 | } | |
175 | ||
176 | return 0; | |
1bc98276 CS |
177 | } |
178 | ||
d0a4f55d DS |
179 | void pim_delete_tracked_nexthop(struct pim_instance *pim, struct prefix *addr, |
180 | struct pim_upstream *up, struct rp_info *rp) | |
1bc98276 | 181 | { |
d62a17ae | 182 | struct pim_nexthop_cache *pnc = NULL; |
183 | struct pim_nexthop_cache lookup; | |
184 | struct zclient *zclient = NULL; | |
185 | ||
186 | zclient = pim_zebra_zclient_get(); | |
187 | ||
188 | /* Remove from RPF hash if it is the last entry */ | |
189 | lookup.rpf.rpf_addr = *addr; | |
d0a4f55d | 190 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
d62a17ae | 191 | if (pnc) { |
192 | if (rp) | |
193 | listnode_delete(pnc->rp_list, rp); | |
194 | if (up) | |
7c591950 | 195 | hash_release(pnc->upstream_hash, up); |
d62a17ae | 196 | |
5cef40fc DS |
197 | if (PIM_DEBUG_PIM_NHT) { |
198 | char buf[PREFIX_STRLEN]; | |
199 | prefix2str(addr, buf, sizeof buf); | |
d62a17ae | 200 | zlog_debug( |
7c591950 | 201 | "%s: NHT %s(%s) rp_list count:%d upstream count:%ld", |
5cef40fc | 202 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
7c591950 | 203 | pnc->rp_list->count, pnc->upstream_hash->count); |
5cef40fc | 204 | } |
d62a17ae | 205 | |
206 | if (pnc->rp_list->count == 0 | |
7c591950 | 207 | && pnc->upstream_hash->count == 0) { |
64c86530 | 208 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
d62a17ae | 209 | ZEBRA_NEXTHOP_UNREGISTER); |
210 | ||
affe9e99 | 211 | list_delete_and_null(&pnc->rp_list); |
7c591950 | 212 | hash_free(pnc->upstream_hash); |
d62a17ae | 213 | |
d0a4f55d | 214 | hash_release(pim->rpf_hash, pnc); |
d62a17ae | 215 | if (pnc->nexthop) |
216 | nexthops_free(pnc->nexthop); | |
217 | XFREE(MTYPE_PIM_NEXTHOP_CACHE, pnc); | |
218 | } | |
219 | } | |
1bc98276 CS |
220 | } |
221 | ||
222 | /* Update RP nexthop info based on Nexthop update received from Zebra.*/ | |
a7f95c76 DS |
223 | static void pim_update_rp_nh(struct pim_instance *pim, |
224 | struct pim_nexthop_cache *pnc) | |
1bc98276 | 225 | { |
d62a17ae | 226 | struct listnode *node = NULL; |
227 | struct rp_info *rp_info = NULL; | |
d62a17ae | 228 | |
229 | /*Traverse RP list and update each RP Nexthop info */ | |
230 | for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) { | |
231 | if (rp_info->rp.rpf_addr.u.prefix4.s_addr == INADDR_NONE) | |
232 | continue; | |
233 | ||
234 | // Compute PIM RPF using cached nexthop | |
996c9314 LB |
235 | pim_ecmp_nexthop_search(pim, pnc, &rp_info->rp.source_nexthop, |
236 | &rp_info->rp.rpf_addr, &rp_info->group, | |
237 | 1); | |
d62a17ae | 238 | } |
1bc98276 CS |
239 | } |
240 | ||
633988a7 CS |
241 | /* This API is used to traverse nexthop cache of RPF addr |
242 | of upstream entry whose IPv4 nexthop address is in | |
243 | unresolved state and due to event like pim neighbor | |
244 | UP event if it can be resolved. | |
245 | */ | |
25b787a2 | 246 | void pim_resolve_upstream_nh(struct pim_instance *pim, struct prefix *nht_p) |
633988a7 | 247 | { |
d62a17ae | 248 | struct nexthop *nh_node = NULL; |
249 | struct pim_nexthop_cache pnc; | |
250 | struct pim_neighbor *nbr = NULL; | |
251 | ||
252 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
25b787a2 | 253 | if (!pim_find_or_track_nexthop(pim, nht_p, NULL, NULL, &pnc)) |
cb9c7c50 DS |
254 | return; |
255 | ||
256 | for (nh_node = pnc.nexthop; nh_node; nh_node = nh_node->next) { | |
257 | if (nh_node->gate.ipv4.s_addr != 0) | |
258 | continue; | |
259 | ||
260 | struct interface *ifp1 = | |
25b787a2 | 261 | if_lookup_by_index(nh_node->ifindex, pim->vrf_id); |
cb9c7c50 DS |
262 | nbr = pim_neighbor_find_if(ifp1); |
263 | if (!nbr) | |
264 | continue; | |
265 | ||
266 | nh_node->gate.ipv4 = nbr->source_addr; | |
5cef40fc | 267 | if (PIM_DEBUG_PIM_NHT) { |
cb9c7c50 DS |
268 | char str[PREFIX_STRLEN]; |
269 | char str1[INET_ADDRSTRLEN]; | |
270 | pim_inet4_dump("<nht_nbr?>", nbr->source_addr, str1, | |
271 | sizeof(str1)); | |
272 | pim_addr_dump("<nht_addr?>", nht_p, str, sizeof(str)); | |
273 | zlog_debug( | |
274 | "%s: addr %s new nexthop addr %s interface %s", | |
275 | __PRETTY_FUNCTION__, str, str1, ifp1->name); | |
d62a17ae | 276 | } |
277 | } | |
633988a7 CS |
278 | } |
279 | ||
1bc98276 | 280 | /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/ |
7c591950 | 281 | static int pim_update_upstream_nh_helper(struct hash_backet *backet, void *arg) |
1bc98276 | 282 | { |
7c591950 DS |
283 | struct pim_instance *pim = (struct pim_instance *)arg; |
284 | struct pim_upstream *up = (struct pim_upstream *)backet->data; | |
d62a17ae | 285 | int vif_index = 0; |
286 | ||
7c591950 DS |
287 | enum pim_rpf_result rpf_result; |
288 | struct pim_rpf old; | |
d62a17ae | 289 | |
7c591950 DS |
290 | old.source_nexthop.interface = up->rpf.source_nexthop.interface; |
291 | rpf_result = pim_rpf_update(pim, up, &old, 0); | |
a7f95c76 DS |
292 | if (rpf_result == PIM_RPF_FAILURE) { |
293 | pim_mroute_del(up->channel_oil, __PRETTY_FUNCTION__); | |
7c591950 | 294 | return HASHWALK_CONTINUE; |
a7f95c76 | 295 | } |
d62a17ae | 296 | |
7c591950 DS |
297 | /* update kernel multicast forwarding cache (MFC) */ |
298 | if (up->channel_oil) { | |
299 | ifindex_t ifindex = up->rpf.source_nexthop.interface->ifindex; | |
300 | ||
301 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); | |
302 | /* Pass Current selected NH vif index to mroute download | |
303 | */ | |
304 | if (vif_index) | |
305 | pim_scan_individual_oil(up->channel_oil, vif_index); | |
306 | else { | |
307 | if (PIM_DEBUG_PIM_NHT) | |
308 | zlog_debug( | |
309 | "%s: NHT upstream %s channel_oil IIF %s vif_index is not valid", | |
310 | __PRETTY_FUNCTION__, up->sg_str, | |
311 | up->rpf.source_nexthop.interface->name); | |
d62a17ae | 312 | } |
7c591950 DS |
313 | } |
314 | ||
315 | if (rpf_result == PIM_RPF_CHANGED) { | |
316 | struct pim_neighbor *nbr; | |
d62a17ae | 317 | |
7c591950 DS |
318 | nbr = pim_neighbor_find(old.source_nexthop.interface, |
319 | old.rpf_addr.u.prefix4); | |
320 | if (nbr) | |
321 | pim_jp_agg_remove_group(nbr->upstream_jp_agg, up); | |
d62a17ae | 322 | |
7c591950 DS |
323 | /* |
324 | * We have detected a case where we might need to rescan | |
325 | * the inherited o_list so do it. | |
326 | */ | |
996c9314 | 327 | if (up->channel_oil && up->channel_oil->oil_inherited_rescan) { |
7c591950 DS |
328 | pim_upstream_inherited_olist_decide(pim, up); |
329 | up->channel_oil->oil_inherited_rescan = 0; | |
330 | } | |
d62a17ae | 331 | |
7c591950 | 332 | if (up->join_state == PIM_UPSTREAM_JOINED) { |
d62a17ae | 333 | /* |
7c591950 DS |
334 | * If we come up real fast we can be here |
335 | * where the mroute has not been installed | |
336 | * so install it. | |
d62a17ae | 337 | */ |
996c9314 | 338 | if (up->channel_oil && !up->channel_oil->installed) |
7c591950 DS |
339 | pim_mroute_add(up->channel_oil, |
340 | __PRETTY_FUNCTION__); | |
d62a17ae | 341 | |
7c591950 DS |
342 | /* |
343 | * RFC 4601: 4.5.7. Sending (S,G) Join/Prune Messages | |
344 | * | |
345 | * Transitions from Joined State | |
346 | * | |
347 | * RPF'(S,G) changes not due to an Assert | |
348 | * | |
349 | * The upstream (S,G) state machine remains in Joined | |
350 | * state. Send Join(S,G) to the new upstream | |
351 | * neighbor, which is the new value of RPF'(S,G). | |
352 | * Send Prune(S,G) to the old upstream neighbor, which | |
353 | * is the old value of RPF'(S,G). Set the Join | |
354 | * Timer (JT) to expire after t_periodic seconds. | |
355 | */ | |
356 | pim_jp_agg_switch_interface(&old, &up->rpf, up); | |
d62a17ae | 357 | |
7c591950 DS |
358 | pim_upstream_join_timer_restart(up, &old); |
359 | } /* up->join_state == PIM_UPSTREAM_JOINED */ | |
360 | ||
361 | /* | |
362 | * FIXME can join_desired actually be changed by | |
363 | * pim_rpf_update() returning PIM_RPF_CHANGED ? | |
364 | */ | |
365 | pim_upstream_update_join_desired(pim, up); | |
366 | ||
367 | } /* PIM_RPF_CHANGED */ | |
368 | ||
369 | if (PIM_DEBUG_PIM_NHT) { | |
370 | zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s", | |
371 | __PRETTY_FUNCTION__, up->sg_str, pim->vrf->name, | |
372 | old.source_nexthop.interface->name, | |
373 | up->rpf.source_nexthop.interface->name); | |
374 | } | |
375 | ||
376 | return HASHWALK_CONTINUE; | |
377 | } | |
378 | ||
379 | static int pim_update_upstream_nh(struct pim_instance *pim, | |
380 | struct pim_nexthop_cache *pnc) | |
381 | { | |
f4e14fdb | 382 | struct listnode *node; |
7c591950 DS |
383 | struct interface *ifp; |
384 | ||
385 | hash_walk(pnc->upstream_hash, pim_update_upstream_nh_helper, pim); | |
d62a17ae | 386 | |
451fda4f | 387 | FOR_ALL_INTERFACES (pim->vrf, ifp) |
d62a17ae | 388 | if (ifp->info) { |
389 | struct pim_interface *pim_ifp = ifp->info; | |
390 | struct pim_iface_upstream_switch *us; | |
391 | ||
392 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->upstream_switch_list, | |
393 | node, us)) { | |
394 | struct pim_rpf rpf; | |
395 | rpf.source_nexthop.interface = ifp; | |
396 | rpf.rpf_addr.u.prefix4 = us->address; | |
397 | pim_joinprune_send(&rpf, us->us); | |
398 | pim_jp_agg_clear_group(us->us); | |
399 | } | |
400 | } | |
401 | ||
402 | return 0; | |
1bc98276 CS |
403 | } |
404 | ||
d62a17ae | 405 | uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp) |
633988a7 | 406 | { |
d62a17ae | 407 | uint32_t hash_val; |
408 | uint32_t s = 0, g = 0; | |
409 | ||
410 | if ((!src)) | |
411 | return 0; | |
412 | ||
413 | switch (src->family) { | |
414 | case AF_INET: { | |
415 | s = src->u.prefix4.s_addr; | |
416 | s = s == 0 ? 1 : s; | |
417 | if (grp) | |
418 | g = grp->u.prefix4.s_addr; | |
419 | } break; | |
420 | default: | |
421 | break; | |
422 | } | |
423 | ||
424 | hash_val = jhash_2words(g, s, 101); | |
d62a17ae | 425 | return hash_val; |
633988a7 CS |
426 | } |
427 | ||
25b787a2 DS |
428 | int pim_ecmp_nexthop_search(struct pim_instance *pim, |
429 | struct pim_nexthop_cache *pnc, | |
d62a17ae | 430 | struct pim_nexthop *nexthop, struct prefix *src, |
431 | struct prefix *grp, int neighbor_needed) | |
633988a7 | 432 | { |
d62a17ae | 433 | struct pim_neighbor *nbr = NULL; |
434 | struct nexthop *nh_node = NULL; | |
435 | ifindex_t first_ifindex; | |
436 | struct interface *ifp = NULL; | |
437 | uint32_t hash_val = 0, mod_val = 0; | |
438 | uint8_t nh_iter = 0, found = 0; | |
439 | ||
440 | if (!pnc || !pnc->nexthop_num || !nexthop) | |
cb9c7c50 | 441 | return 0; |
d62a17ae | 442 | |
443 | // Current Nexthop is VALID, check to stay on the current path. | |
444 | if (nexthop->interface && nexthop->interface->info | |
445 | && nexthop->mrib_nexthop_addr.u.prefix4.s_addr | |
446 | != PIM_NET_INADDR_ANY) { | |
447 | /* User configured knob to explicitly switch | |
448 | to new path is disabled or current path | |
449 | metric is less than nexthop update. | |
450 | */ | |
451 | ||
452 | if (qpim_ecmp_rebalance_enable == 0) { | |
453 | uint8_t curr_route_valid = 0; | |
454 | // Check if current nexthop is present in new updated | |
455 | // Nexthop list. | |
456 | // If the current nexthop is not valid, candidate to | |
457 | // choose new Nexthop. | |
458 | for (nh_node = pnc->nexthop; nh_node; | |
1b5f8a1a | 459 | nh_node = nh_node->next) { |
d62a17ae | 460 | curr_route_valid = (nexthop->interface->ifindex |
461 | == nh_node->ifindex); | |
1b5f8a1a DS |
462 | if (curr_route_valid) |
463 | break; | |
464 | } | |
d62a17ae | 465 | |
466 | if (curr_route_valid | |
467 | && !pim_if_connected_to_source(nexthop->interface, | |
468 | src->u.prefix4)) { | |
469 | nbr = pim_neighbor_find( | |
470 | nexthop->interface, | |
471 | nexthop->mrib_nexthop_addr.u.prefix4); | |
472 | if (!nbr | |
473 | && !if_is_loopback(nexthop->interface)) { | |
5cef40fc | 474 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 475 | zlog_debug( |
476 | "%s: current nexthop does not have nbr ", | |
477 | __PRETTY_FUNCTION__); | |
478 | } else { | |
5cef40fc | 479 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 480 | char src_str[INET_ADDRSTRLEN]; |
481 | pim_inet4_dump("<addr?>", | |
482 | src->u.prefix4, | |
483 | src_str, | |
484 | sizeof(src_str)); | |
485 | char grp_str[INET_ADDRSTRLEN]; | |
486 | pim_inet4_dump("<addr?>", | |
487 | grp->u.prefix4, | |
488 | grp_str, | |
489 | sizeof(grp_str)); | |
490 | zlog_debug( | |
5cef40fc | 491 | "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection", |
d62a17ae | 492 | __PRETTY_FUNCTION__, |
493 | src_str, grp_str, | |
5cef40fc | 494 | pim->vrf->name, |
d62a17ae | 495 | nexthop->interface->name); |
496 | } | |
a7f95c76 | 497 | return 1; |
d62a17ae | 498 | } |
499 | } | |
500 | } | |
501 | } | |
502 | if (qpim_ecmp_enable) { | |
503 | // PIM ECMP flag is enable then choose ECMP path. | |
504 | hash_val = pim_compute_ecmp_hash(src, grp); | |
505 | mod_val = hash_val % pnc->nexthop_num; | |
d62a17ae | 506 | } |
507 | ||
508 | for (nh_node = pnc->nexthop; nh_node && (found == 0); | |
509 | nh_node = nh_node->next) { | |
510 | first_ifindex = nh_node->ifindex; | |
25b787a2 | 511 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); |
d62a17ae | 512 | if (!ifp) { |
5cef40fc | 513 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 514 | char addr_str[INET_ADDRSTRLEN]; |
515 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
516 | addr_str, sizeof(addr_str)); | |
517 | zlog_debug( | |
5cef40fc | 518 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 519 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
520 | first_ifindex, addr_str, |
521 | pim->vrf->name); | |
d62a17ae | 522 | } |
523 | if (nh_iter == mod_val) | |
524 | mod_val++; // Select nexthpath | |
525 | nh_iter++; | |
526 | continue; | |
527 | } | |
528 | if (!ifp->info) { | |
5cef40fc | 529 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 530 | char addr_str[INET_ADDRSTRLEN]; |
531 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
532 | addr_str, sizeof(addr_str)); | |
533 | zlog_debug( | |
5cef40fc | 534 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 535 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
536 | pim->vrf->name, first_ifindex, |
537 | addr_str); | |
d62a17ae | 538 | } |
539 | if (nh_iter == mod_val) | |
540 | mod_val++; // Select nexthpath | |
541 | nh_iter++; | |
542 | continue; | |
543 | } | |
544 | ||
545 | if (neighbor_needed | |
546 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
547 | nbr = pim_neighbor_find(ifp, nh_node->gate.ipv4); | |
d62a17ae | 548 | if (!nbr && !if_is_loopback(ifp)) { |
5cef40fc | 549 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 550 | zlog_debug( |
5cef40fc DS |
551 | "%s: pim nbr not found on input interface %s(%s)", |
552 | __PRETTY_FUNCTION__, ifp->name, | |
553 | pim->vrf->name); | |
d62a17ae | 554 | if (nh_iter == mod_val) |
555 | mod_val++; // Select nexthpath | |
556 | nh_iter++; | |
557 | continue; | |
558 | } | |
559 | } | |
560 | ||
561 | if (nh_iter == mod_val) { | |
562 | nexthop->interface = ifp; | |
563 | nexthop->mrib_nexthop_addr.family = AF_INET; | |
564 | nexthop->mrib_nexthop_addr.prefixlen = IPV4_MAX_BITLEN; | |
565 | nexthop->mrib_nexthop_addr.u.prefix4 = | |
566 | nh_node->gate.ipv4; | |
567 | nexthop->mrib_metric_preference = pnc->distance; | |
568 | nexthop->mrib_route_metric = pnc->metric; | |
569 | nexthop->last_lookup = src->u.prefix4; | |
570 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
571 | nexthop->nbr = nbr; | |
572 | found = 1; | |
5cef40fc | 573 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 574 | char buf[INET_ADDRSTRLEN]; |
575 | char buf2[INET_ADDRSTRLEN]; | |
576 | char buf3[INET_ADDRSTRLEN]; | |
577 | pim_inet4_dump("<src?>", src->u.prefix4, buf2, | |
578 | sizeof(buf2)); | |
579 | pim_inet4_dump("<grp?>", grp->u.prefix4, buf3, | |
580 | sizeof(buf3)); | |
581 | pim_inet4_dump( | |
582 | "<rpf?>", | |
583 | nexthop->mrib_nexthop_addr.u.prefix4, | |
584 | buf, sizeof(buf)); | |
585 | zlog_debug( | |
5cef40fc | 586 | "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d", |
d62a17ae | 587 | __PRETTY_FUNCTION__, buf2, buf3, |
5cef40fc DS |
588 | pim->vrf->name, ifp->name, buf, mod_val, |
589 | nh_iter, qpim_ecmp_enable); | |
d62a17ae | 590 | } |
591 | } | |
592 | nh_iter++; | |
593 | } | |
594 | ||
595 | if (found) | |
cb9c7c50 | 596 | return 1; |
d62a17ae | 597 | else |
cb9c7c50 | 598 | return 0; |
633988a7 CS |
599 | } |
600 | ||
d62a17ae | 601 | /* This API is used to parse Registered address nexthop update coming from Zebra |
602 | */ | |
603 | int pim_parse_nexthop_update(int command, struct zclient *zclient, | |
604 | zebra_size_t length, vrf_id_t vrf_id) | |
1bc98276 | 605 | { |
d62a17ae | 606 | struct nexthop *nexthop; |
607 | struct nexthop *nhlist_head = NULL; | |
608 | struct nexthop *nhlist_tail = NULL; | |
d62a17ae | 609 | int i; |
610 | struct pim_rpf rpf; | |
611 | struct pim_nexthop_cache *pnc = NULL; | |
612 | struct pim_neighbor *nbr = NULL; | |
613 | struct interface *ifp = NULL; | |
614 | struct interface *ifp1 = NULL; | |
cf663ceb | 615 | struct vrf *vrf = vrf_lookup_by_id(vrf_id); |
819f099b | 616 | struct pim_instance *pim; |
4a749e2c | 617 | struct zapi_route nhr; |
819f099b DS |
618 | |
619 | if (!vrf) | |
620 | return 0; | |
621 | pim = vrf->info; | |
d62a17ae | 622 | |
7d30a959 DS |
623 | if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) { |
624 | if (PIM_DEBUG_PIM_NHT) | |
996c9314 LB |
625 | zlog_debug( |
626 | "%s: Decode of nexthop update from zebra failed", | |
627 | __PRETTY_FUNCTION__); | |
7d30a959 DS |
628 | return 0; |
629 | } | |
d62a17ae | 630 | |
631 | if (command == ZEBRA_NEXTHOP_UPDATE) { | |
4a749e2c | 632 | prefix_copy(&rpf.rpf_addr, &nhr.prefix); |
25b787a2 | 633 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 634 | if (!pnc) { |
5cef40fc | 635 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 636 | char buf[PREFIX2STR_BUFFER]; |
637 | prefix2str(&rpf.rpf_addr, buf, sizeof(buf)); | |
638 | zlog_debug( | |
639 | "%s: Skipping NHT update, addr %s is not in local cached DB.", | |
640 | __PRETTY_FUNCTION__, buf); | |
641 | } | |
642 | return 0; | |
643 | } | |
644 | } else { | |
645 | /* | |
646 | * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE | |
647 | */ | |
648 | return 0; | |
649 | } | |
650 | ||
651 | pnc->last_update = pim_time_monotonic_usec(); | |
d62a17ae | 652 | |
4a749e2c | 653 | if (nhr.nexthop_num) { |
d62a17ae | 654 | pnc->nexthop_num = 0; // Only increment for pim enabled rpf. |
655 | ||
4a749e2c DS |
656 | for (i = 0; i < nhr.nexthop_num; i++) { |
657 | nexthop = nexthop_from_zapi_nexthop(&nhr.nexthops[i]); | |
d62a17ae | 658 | switch (nexthop->type) { |
659 | case NEXTHOP_TYPE_IPV4: | |
d62a17ae | 660 | case NEXTHOP_TYPE_IFINDEX: |
d62a17ae | 661 | case NEXTHOP_TYPE_IPV4_IFINDEX: |
d62a17ae | 662 | case NEXTHOP_TYPE_IPV6: |
4a749e2c | 663 | case NEXTHOP_TYPE_BLACKHOLE: |
d62a17ae | 664 | break; |
665 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
d62a17ae | 666 | ifp1 = if_lookup_by_index(nexthop->ifindex, |
25b787a2 | 667 | pim->vrf_id); |
d62a17ae | 668 | nbr = pim_neighbor_find_if(ifp1); |
669 | /* Overwrite with Nbr address as NH addr */ | |
5cef40fc | 670 | if (nbr) |
d62a17ae | 671 | nexthop->gate.ipv4 = nbr->source_addr; |
5cef40fc | 672 | else { |
d62a17ae | 673 | // Mark nexthop address to 0 until PIM |
674 | // Nbr is resolved. | |
675 | nexthop->gate.ipv4.s_addr = | |
676 | PIM_NET_INADDR_ANY; | |
677 | } | |
678 | ||
d62a17ae | 679 | break; |
680 | } | |
681 | ||
25b787a2 | 682 | ifp = if_lookup_by_index(nexthop->ifindex, pim->vrf_id); |
d62a17ae | 683 | if (!ifp) { |
5cef40fc | 684 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 685 | char buf[NEXTHOP_STRLEN]; |
686 | zlog_debug( | |
5cef40fc | 687 | "%s: could not find interface for ifindex %d(%s) (addr %s)", |
d62a17ae | 688 | __PRETTY_FUNCTION__, |
689 | nexthop->ifindex, | |
5cef40fc | 690 | pim->vrf->name, |
d62a17ae | 691 | nexthop2str(nexthop, buf, |
692 | sizeof(buf))); | |
693 | } | |
694 | nexthop_free(nexthop); | |
695 | continue; | |
696 | } | |
697 | ||
1b5f8a1a DS |
698 | if (PIM_DEBUG_PIM_NHT) { |
699 | char p_str[PREFIX2STR_BUFFER]; | |
4a749e2c DS |
700 | |
701 | prefix2str(&nhr.prefix, p_str, sizeof(p_str)); | |
1b5f8a1a DS |
702 | zlog_debug( |
703 | "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ", | |
704 | __PRETTY_FUNCTION__, p_str, | |
705 | pim->vrf->name, i + 1, | |
706 | inet_ntoa(nexthop->gate.ipv4), | |
4a749e2c DS |
707 | ifp->name, nexthop->type, nhr.distance, |
708 | nhr.metric); | |
1b5f8a1a DS |
709 | } |
710 | ||
d62a17ae | 711 | if (!ifp->info) { |
5cef40fc | 712 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 713 | char buf[NEXTHOP_STRLEN]; |
4a749e2c | 714 | |
d62a17ae | 715 | zlog_debug( |
5cef40fc | 716 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)", |
d62a17ae | 717 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 718 | pim->vrf->name, |
d62a17ae | 719 | nexthop->ifindex, |
720 | nexthop2str(nexthop, buf, | |
721 | sizeof(buf))); | |
722 | } | |
723 | nexthop_free(nexthop); | |
724 | continue; | |
725 | } | |
726 | ||
727 | if (nhlist_tail) { | |
728 | nhlist_tail->next = nexthop; | |
729 | nhlist_tail = nexthop; | |
730 | } else { | |
731 | nhlist_tail = nexthop; | |
732 | nhlist_head = nexthop; | |
733 | } | |
734 | // Only keep track of nexthops which are PIM enabled. | |
735 | pnc->nexthop_num++; | |
736 | } | |
737 | /* Reset existing pnc->nexthop before assigning new list */ | |
738 | nexthops_free(pnc->nexthop); | |
739 | pnc->nexthop = nhlist_head; | |
740 | if (pnc->nexthop_num) { | |
741 | pnc->flags |= PIM_NEXTHOP_VALID; | |
4a749e2c DS |
742 | pnc->distance = nhr.distance; |
743 | pnc->metric = nhr.metric; | |
d62a17ae | 744 | } |
745 | } else { | |
746 | pnc->flags &= ~PIM_NEXTHOP_VALID; | |
4a749e2c | 747 | pnc->nexthop_num = nhr.nexthop_num; |
d62a17ae | 748 | nexthops_free(pnc->nexthop); |
749 | pnc->nexthop = NULL; | |
750 | } | |
751 | ||
5cef40fc | 752 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 753 | char buf[PREFIX2STR_BUFFER]; |
4a749e2c | 754 | prefix2str(&nhr.prefix, buf, sizeof(buf)); |
d62a17ae | 755 | zlog_debug( |
87ad28f4 | 756 | "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d", |
4a749e2c DS |
757 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
758 | nhr.nexthop_num, pnc->nexthop_num, vrf_id, | |
996c9314 | 759 | pnc->upstream_hash->count, listcount(pnc->rp_list)); |
d62a17ae | 760 | } |
761 | ||
bfc92019 | 762 | pim_rpf_set_refresh_time(pim); |
d62a17ae | 763 | |
764 | if (listcount(pnc->rp_list)) | |
25b787a2 | 765 | pim_update_rp_nh(pim, pnc); |
7c591950 | 766 | if (pnc->upstream_hash->count) |
cf663ceb | 767 | pim_update_upstream_nh(pim, pnc); |
d62a17ae | 768 | |
769 | return 0; | |
1bc98276 | 770 | } |
633988a7 | 771 | |
25b787a2 DS |
772 | int pim_ecmp_nexthop_lookup(struct pim_instance *pim, |
773 | struct pim_nexthop *nexthop, struct in_addr addr, | |
d62a17ae | 774 | struct prefix *src, struct prefix *grp, |
775 | int neighbor_needed) | |
633988a7 | 776 | { |
d62a17ae | 777 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
778 | struct pim_neighbor *nbr = NULL; | |
779 | int num_ifindex; | |
780 | struct interface *ifp; | |
781 | int first_ifindex; | |
782 | int found = 0; | |
783 | uint8_t i = 0; | |
784 | uint32_t hash_val = 0, mod_val = 0; | |
785 | ||
5cef40fc | 786 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 787 | char addr_str[INET_ADDRSTRLEN]; |
788 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
5cef40fc DS |
789 | zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld", |
790 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name, | |
d62a17ae | 791 | nexthop->last_lookup_time); |
792 | } | |
793 | ||
794 | memset(nexthop_tab, 0, | |
795 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
71edad0f DS |
796 | num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, |
797 | addr, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 798 | if (num_ifindex < 1) { |
209a5679 DS |
799 | if (PIM_DEBUG_PIM_NHT) { |
800 | char addr_str[INET_ADDRSTRLEN]; | |
996c9314 LB |
801 | pim_inet4_dump("<addr?>", addr, addr_str, |
802 | sizeof(addr_str)); | |
209a5679 DS |
803 | zlog_warn( |
804 | "%s: could not find nexthop ifindex for address %s(%s)", | |
996c9314 | 805 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); |
209a5679 | 806 | } |
cb9c7c50 | 807 | return 0; |
d62a17ae | 808 | } |
809 | ||
810 | // If PIM ECMP enable then choose ECMP path. | |
811 | if (qpim_ecmp_enable) { | |
812 | hash_val = pim_compute_ecmp_hash(src, grp); | |
813 | mod_val = hash_val % num_ifindex; | |
5cef40fc | 814 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 815 | zlog_debug("%s: hash_val %u mod_val %u", |
816 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
817 | } | |
818 | ||
819 | while (!found && (i < num_ifindex)) { | |
820 | first_ifindex = nexthop_tab[i].ifindex; | |
821 | ||
25b787a2 | 822 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); |
d62a17ae | 823 | if (!ifp) { |
5cef40fc | 824 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 825 | char addr_str[INET_ADDRSTRLEN]; |
826 | pim_inet4_dump("<addr?>", addr, addr_str, | |
827 | sizeof(addr_str)); | |
828 | zlog_debug( | |
5cef40fc | 829 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 830 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
831 | first_ifindex, addr_str, |
832 | pim->vrf->name); | |
d62a17ae | 833 | } |
834 | if (i == mod_val) | |
835 | mod_val++; | |
836 | i++; | |
837 | continue; | |
838 | } | |
839 | ||
840 | if (!ifp->info) { | |
5cef40fc | 841 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 842 | char addr_str[INET_ADDRSTRLEN]; |
843 | pim_inet4_dump("<addr?>", addr, addr_str, | |
844 | sizeof(addr_str)); | |
845 | zlog_debug( | |
5cef40fc | 846 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 847 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
848 | pim->vrf->name, first_ifindex, |
849 | addr_str); | |
d62a17ae | 850 | } |
851 | if (i == mod_val) | |
852 | mod_val++; | |
853 | i++; | |
854 | continue; | |
855 | } | |
856 | if (neighbor_needed && !pim_if_connected_to_source(ifp, addr)) { | |
857 | nbr = pim_neighbor_find( | |
858 | ifp, nexthop_tab[i].nexthop_addr.u.prefix4); | |
5cef40fc DS |
859 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
860 | zlog_debug("ifp name: %s(%s), pim nbr: %p", | |
861 | ifp->name, pim->vrf->name, nbr); | |
d62a17ae | 862 | if (!nbr && !if_is_loopback(ifp)) { |
863 | if (i == mod_val) | |
864 | mod_val++; | |
865 | i++; | |
5cef40fc | 866 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 867 | char addr_str[INET_ADDRSTRLEN]; |
868 | pim_inet4_dump("<addr?>", addr, | |
869 | addr_str, | |
870 | sizeof(addr_str)); | |
871 | zlog_debug( | |
5cef40fc | 872 | "%s: NBR not found on input interface %s(%s) (RPF for source %s)", |
d62a17ae | 873 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 874 | pim->vrf->name, addr_str); |
d62a17ae | 875 | } |
876 | continue; | |
877 | } | |
878 | } | |
879 | ||
880 | if (i == mod_val) { | |
5cef40fc | 881 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 882 | char nexthop_str[PREFIX_STRLEN]; |
883 | char addr_str[INET_ADDRSTRLEN]; | |
884 | pim_addr_dump("<nexthop?>", | |
885 | &nexthop_tab[i].nexthop_addr, | |
886 | nexthop_str, sizeof(nexthop_str)); | |
887 | pim_inet4_dump("<addr?>", addr, addr_str, | |
888 | sizeof(addr_str)); | |
889 | zlog_debug( | |
5cef40fc DS |
890 | "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d", |
891 | __PRETTY_FUNCTION__, nexthop_str, | |
892 | addr_str, ifp->name, pim->vrf->name, | |
d62a17ae | 893 | nexthop_tab[i].route_metric, |
894 | nexthop_tab[i].protocol_distance); | |
895 | } | |
896 | /* update nextop data */ | |
897 | nexthop->interface = ifp; | |
898 | nexthop->mrib_nexthop_addr = | |
899 | nexthop_tab[i].nexthop_addr; | |
900 | nexthop->mrib_metric_preference = | |
901 | nexthop_tab[i].protocol_distance; | |
902 | nexthop->mrib_route_metric = | |
903 | nexthop_tab[i].route_metric; | |
904 | nexthop->last_lookup = addr; | |
905 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
906 | nexthop->nbr = nbr; | |
907 | found = 1; | |
908 | } | |
909 | i++; | |
910 | } | |
cb9c7c50 | 911 | |
d62a17ae | 912 | if (found) |
cb9c7c50 | 913 | return 1; |
d62a17ae | 914 | else |
cb9c7c50 | 915 | return 0; |
633988a7 | 916 | } |
815c33c9 | 917 | |
25b787a2 DS |
918 | int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim, |
919 | struct in_addr addr, struct prefix *src, | |
d62a17ae | 920 | struct prefix *grp) |
815c33c9 | 921 | { |
d62a17ae | 922 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
923 | int num_ifindex; | |
924 | int vif_index; | |
925 | ifindex_t first_ifindex; | |
926 | uint32_t hash_val = 0, mod_val = 0; | |
927 | ||
928 | memset(nexthop_tab, 0, | |
929 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
71edad0f DS |
930 | num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, |
931 | addr, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 932 | if (num_ifindex < 1) { |
5cef40fc | 933 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 934 | char addr_str[INET_ADDRSTRLEN]; |
935 | pim_inet4_dump("<addr?>", addr, addr_str, | |
936 | sizeof(addr_str)); | |
937 | zlog_debug( | |
5cef40fc DS |
938 | "%s: could not find nexthop ifindex for address %s(%s)", |
939 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); | |
d62a17ae | 940 | } |
941 | return -1; | |
942 | } | |
943 | ||
944 | // If PIM ECMP enable then choose ECMP path. | |
945 | if (qpim_ecmp_enable) { | |
946 | hash_val = pim_compute_ecmp_hash(src, grp); | |
947 | mod_val = hash_val % num_ifindex; | |
5cef40fc | 948 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 949 | zlog_debug("%s: hash_val %u mod_val %u", |
950 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
951 | } | |
952 | ||
953 | first_ifindex = nexthop_tab[mod_val].ifindex; | |
954 | ||
5cef40fc | 955 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 956 | char addr_str[INET_ADDRSTRLEN]; |
957 | pim_inet4_dump("<ifaddr?>", addr, addr_str, sizeof(addr_str)); | |
958 | zlog_debug( | |
5cef40fc DS |
959 | "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s", |
960 | __PRETTY_FUNCTION__, first_ifindex, | |
961 | ifindex2ifname(first_ifindex, pim->vrf_id), | |
962 | pim->vrf->name, addr_str); | |
d62a17ae | 963 | } |
964 | ||
7cfc7bcf | 965 | vif_index = pim_if_find_vifindex_by_ifindex(pim, first_ifindex); |
d62a17ae | 966 | |
967 | if (vif_index < 0) { | |
5cef40fc | 968 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 969 | char addr_str[INET_ADDRSTRLEN]; |
970 | pim_inet4_dump("<addr?>", addr, addr_str, | |
971 | sizeof(addr_str)); | |
972 | zlog_debug( | |
5cef40fc DS |
973 | "%s: low vif_index=%d(%s) < 1 nexthop for address %s", |
974 | __PRETTY_FUNCTION__, vif_index, pim->vrf->name, | |
d62a17ae | 975 | addr_str); |
976 | } | |
977 | return -2; | |
978 | } | |
979 | ||
980 | return vif_index; | |
815c33c9 | 981 | } |