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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 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); | |
cf663ceb | 61 | zclient_create_header(s, command, pim->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 | ||
5cef40fc | 84 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 85 | char buf[PREFIX2STR_BUFFER]; |
86 | prefix2str(p, buf, sizeof(buf)); | |
5cef40fc DS |
87 | zlog_debug( |
88 | "%s: NHT %sregistered addr %s(%s) with Zebra ret:%d ", | |
89 | __PRETTY_FUNCTION__, | |
90 | (command == ZEBRA_NEXTHOP_REGISTER) ? " " : "de", buf, | |
91 | pim->vrf->name, ret); | |
d62a17ae | 92 | } |
93 | ||
94 | return; | |
1bc98276 CS |
95 | } |
96 | ||
d0a4f55d DS |
97 | struct pim_nexthop_cache *pim_nexthop_cache_find(struct pim_instance *pim, |
98 | struct pim_rpf *rpf) | |
1bc98276 | 99 | { |
d62a17ae | 100 | struct pim_nexthop_cache *pnc = NULL; |
101 | struct pim_nexthop_cache lookup; | |
1bc98276 | 102 | |
d62a17ae | 103 | lookup.rpf.rpf_addr.family = rpf->rpf_addr.family; |
104 | lookup.rpf.rpf_addr.prefixlen = rpf->rpf_addr.prefixlen; | |
105 | lookup.rpf.rpf_addr.u.prefix4.s_addr = rpf->rpf_addr.u.prefix4.s_addr; | |
1bc98276 | 106 | |
d0a4f55d | 107 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
1bc98276 | 108 | |
d62a17ae | 109 | return pnc; |
1bc98276 CS |
110 | } |
111 | ||
5cef40fc DS |
112 | static struct pim_nexthop_cache *pim_nexthop_cache_add(struct pim_instance *pim, |
113 | struct pim_rpf *rpf_addr) | |
1bc98276 | 114 | { |
d62a17ae | 115 | struct pim_nexthop_cache *pnc; |
116 | ||
117 | pnc = XCALLOC(MTYPE_PIM_NEXTHOP_CACHE, | |
118 | sizeof(struct pim_nexthop_cache)); | |
119 | if (!pnc) { | |
120 | zlog_err("%s: NHT PIM XCALLOC failure ", __PRETTY_FUNCTION__); | |
121 | return NULL; | |
122 | } | |
123 | pnc->rpf.rpf_addr.family = rpf_addr->rpf_addr.family; | |
124 | pnc->rpf.rpf_addr.prefixlen = rpf_addr->rpf_addr.prefixlen; | |
125 | pnc->rpf.rpf_addr.u.prefix4.s_addr = | |
126 | rpf_addr->rpf_addr.u.prefix4.s_addr; | |
127 | ||
d0a4f55d | 128 | pnc = hash_get(pim->rpf_hash, pnc, hash_alloc_intern); |
d62a17ae | 129 | |
130 | pnc->rp_list = list_new(); | |
131 | pnc->rp_list->cmp = pim_rp_list_cmp; | |
132 | ||
7c591950 DS |
133 | pnc->upstream_hash = hash_create_size(8192, pim_upstream_hash_key, |
134 | pim_upstream_equal, | |
135 | "PNC Upstream Hash"); | |
d62a17ae | 136 | |
d62a17ae | 137 | return pnc; |
1bc98276 CS |
138 | } |
139 | ||
cb9c7c50 DS |
140 | /* |
141 | * pim_find_or_track_nexthop | |
142 | * | |
143 | * This API is used to Register an address with Zebra | |
144 | * | |
145 | * 1 -> Success | |
146 | * 0 -> Failure | |
147 | */ | |
25bdac42 DS |
148 | int pim_find_or_track_nexthop(struct pim_instance *pim, struct prefix *addr, |
149 | struct pim_upstream *up, struct rp_info *rp, | |
d62a17ae | 150 | struct pim_nexthop_cache *out_pnc) |
1bc98276 | 151 | { |
d62a17ae | 152 | struct pim_nexthop_cache *pnc = NULL; |
153 | struct pim_rpf rpf; | |
154 | struct listnode *ch_node = NULL; | |
155 | struct zclient *zclient = NULL; | |
156 | ||
157 | zclient = pim_zebra_zclient_get(); | |
158 | memset(&rpf, 0, sizeof(struct pim_rpf)); | |
159 | rpf.rpf_addr.family = addr->family; | |
160 | rpf.rpf_addr.prefixlen = addr->prefixlen; | |
161 | rpf.rpf_addr.u.prefix4 = addr->u.prefix4; | |
162 | ||
25bdac42 | 163 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 164 | if (!pnc) { |
25bdac42 | 165 | pnc = pim_nexthop_cache_add(pim, &rpf); |
5cef40fc | 166 | if (!pnc) { |
d62a17ae | 167 | char rpf_str[PREFIX_STRLEN]; |
168 | pim_addr_dump("<nht-pnc?>", addr, rpf_str, | |
169 | sizeof(rpf_str)); | |
170 | zlog_warn("%s: pnc node allocation failed. addr %s ", | |
171 | __PRETTY_FUNCTION__, rpf_str); | |
cb9c7c50 | 172 | return 0; |
d62a17ae | 173 | } |
5cef40fc DS |
174 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
175 | ZEBRA_NEXTHOP_REGISTER); | |
176 | if (PIM_DEBUG_PIM_NHT) { | |
177 | char buf[PREFIX2STR_BUFFER]; | |
178 | prefix2str(addr, buf, sizeof(buf)); | |
179 | zlog_debug( | |
180 | "%s: NHT cache and zebra notification added for %s(%s)", | |
181 | __PRETTY_FUNCTION__, buf, pim->vrf->name); | |
182 | } | |
d62a17ae | 183 | } |
184 | ||
185 | if (rp != NULL) { | |
186 | ch_node = listnode_lookup(pnc->rp_list, rp); | |
5cef40fc | 187 | if (ch_node == NULL) |
d62a17ae | 188 | listnode_add_sort(pnc->rp_list, rp); |
d62a17ae | 189 | } |
190 | ||
7c591950 DS |
191 | if (up != NULL) |
192 | up = hash_get(pnc->upstream_hash, up, hash_alloc_intern); | |
d62a17ae | 193 | |
194 | if (pnc && CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) { | |
195 | memcpy(out_pnc, pnc, sizeof(struct pim_nexthop_cache)); | |
196 | return 1; | |
197 | } | |
198 | ||
199 | return 0; | |
1bc98276 CS |
200 | } |
201 | ||
d0a4f55d DS |
202 | void pim_delete_tracked_nexthop(struct pim_instance *pim, struct prefix *addr, |
203 | struct pim_upstream *up, struct rp_info *rp) | |
1bc98276 | 204 | { |
d62a17ae | 205 | struct pim_nexthop_cache *pnc = NULL; |
206 | struct pim_nexthop_cache lookup; | |
207 | struct zclient *zclient = NULL; | |
208 | ||
209 | zclient = pim_zebra_zclient_get(); | |
210 | ||
211 | /* Remove from RPF hash if it is the last entry */ | |
212 | lookup.rpf.rpf_addr = *addr; | |
d0a4f55d | 213 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
d62a17ae | 214 | if (pnc) { |
215 | if (rp) | |
216 | listnode_delete(pnc->rp_list, rp); | |
217 | if (up) | |
7c591950 | 218 | hash_release(pnc->upstream_hash, up); |
d62a17ae | 219 | |
5cef40fc DS |
220 | if (PIM_DEBUG_PIM_NHT) { |
221 | char buf[PREFIX_STRLEN]; | |
222 | prefix2str(addr, buf, sizeof buf); | |
d62a17ae | 223 | zlog_debug( |
7c591950 | 224 | "%s: NHT %s(%s) rp_list count:%d upstream count:%ld", |
5cef40fc | 225 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
7c591950 | 226 | pnc->rp_list->count, pnc->upstream_hash->count); |
5cef40fc | 227 | } |
d62a17ae | 228 | |
229 | if (pnc->rp_list->count == 0 | |
7c591950 | 230 | && pnc->upstream_hash->count == 0) { |
64c86530 | 231 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
d62a17ae | 232 | ZEBRA_NEXTHOP_UNREGISTER); |
233 | ||
234 | list_delete(pnc->rp_list); | |
7c591950 | 235 | hash_free(pnc->upstream_hash); |
d62a17ae | 236 | |
d0a4f55d | 237 | hash_release(pim->rpf_hash, pnc); |
d62a17ae | 238 | if (pnc->nexthop) |
239 | nexthops_free(pnc->nexthop); | |
240 | XFREE(MTYPE_PIM_NEXTHOP_CACHE, pnc); | |
241 | } | |
242 | } | |
1bc98276 CS |
243 | } |
244 | ||
245 | /* Update RP nexthop info based on Nexthop update received from Zebra.*/ | |
5cef40fc DS |
246 | static int pim_update_rp_nh(struct pim_instance *pim, |
247 | struct pim_nexthop_cache *pnc) | |
1bc98276 | 248 | { |
d62a17ae | 249 | struct listnode *node = NULL; |
250 | struct rp_info *rp_info = NULL; | |
251 | int ret = 0; | |
252 | ||
253 | /*Traverse RP list and update each RP Nexthop info */ | |
254 | for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) { | |
255 | if (rp_info->rp.rpf_addr.u.prefix4.s_addr == INADDR_NONE) | |
256 | continue; | |
257 | ||
258 | // Compute PIM RPF using cached nexthop | |
25b787a2 DS |
259 | ret = pim_ecmp_nexthop_search( |
260 | pim, pnc, &rp_info->rp.source_nexthop, | |
261 | &rp_info->rp.rpf_addr, &rp_info->group, 1); | |
d62a17ae | 262 | } |
263 | ||
5cef40fc | 264 | return !ret; |
1bc98276 CS |
265 | } |
266 | ||
633988a7 CS |
267 | /* This API is used to traverse nexthop cache of RPF addr |
268 | of upstream entry whose IPv4 nexthop address is in | |
269 | unresolved state and due to event like pim neighbor | |
270 | UP event if it can be resolved. | |
271 | */ | |
25b787a2 | 272 | void pim_resolve_upstream_nh(struct pim_instance *pim, struct prefix *nht_p) |
633988a7 | 273 | { |
d62a17ae | 274 | struct nexthop *nh_node = NULL; |
275 | struct pim_nexthop_cache pnc; | |
276 | struct pim_neighbor *nbr = NULL; | |
277 | ||
278 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
25b787a2 | 279 | if (!pim_find_or_track_nexthop(pim, nht_p, NULL, NULL, &pnc)) |
cb9c7c50 DS |
280 | return; |
281 | ||
282 | for (nh_node = pnc.nexthop; nh_node; nh_node = nh_node->next) { | |
283 | if (nh_node->gate.ipv4.s_addr != 0) | |
284 | continue; | |
285 | ||
286 | struct interface *ifp1 = | |
25b787a2 | 287 | if_lookup_by_index(nh_node->ifindex, pim->vrf_id); |
cb9c7c50 DS |
288 | nbr = pim_neighbor_find_if(ifp1); |
289 | if (!nbr) | |
290 | continue; | |
291 | ||
292 | nh_node->gate.ipv4 = nbr->source_addr; | |
5cef40fc | 293 | if (PIM_DEBUG_PIM_NHT) { |
cb9c7c50 DS |
294 | char str[PREFIX_STRLEN]; |
295 | char str1[INET_ADDRSTRLEN]; | |
296 | pim_inet4_dump("<nht_nbr?>", nbr->source_addr, str1, | |
297 | sizeof(str1)); | |
298 | pim_addr_dump("<nht_addr?>", nht_p, str, sizeof(str)); | |
299 | zlog_debug( | |
300 | "%s: addr %s new nexthop addr %s interface %s", | |
301 | __PRETTY_FUNCTION__, str, str1, ifp1->name); | |
d62a17ae | 302 | } |
303 | } | |
633988a7 CS |
304 | } |
305 | ||
1bc98276 | 306 | /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/ |
7c591950 | 307 | static int pim_update_upstream_nh_helper(struct hash_backet *backet, void *arg) |
1bc98276 | 308 | { |
7c591950 DS |
309 | struct pim_instance *pim = (struct pim_instance *)arg; |
310 | struct pim_upstream *up = (struct pim_upstream *)backet->data; | |
d62a17ae | 311 | int vif_index = 0; |
312 | ||
7c591950 DS |
313 | enum pim_rpf_result rpf_result; |
314 | struct pim_rpf old; | |
d62a17ae | 315 | |
7c591950 DS |
316 | old.source_nexthop.interface = up->rpf.source_nexthop.interface; |
317 | rpf_result = pim_rpf_update(pim, up, &old, 0); | |
318 | if (rpf_result == PIM_RPF_FAILURE) | |
319 | return HASHWALK_CONTINUE; | |
d62a17ae | 320 | |
7c591950 DS |
321 | /* update kernel multicast forwarding cache (MFC) */ |
322 | if (up->channel_oil) { | |
323 | ifindex_t ifindex = up->rpf.source_nexthop.interface->ifindex; | |
324 | ||
325 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); | |
326 | /* Pass Current selected NH vif index to mroute download | |
327 | */ | |
328 | if (vif_index) | |
329 | pim_scan_individual_oil(up->channel_oil, vif_index); | |
330 | else { | |
331 | if (PIM_DEBUG_PIM_NHT) | |
332 | zlog_debug( | |
333 | "%s: NHT upstream %s channel_oil IIF %s vif_index is not valid", | |
334 | __PRETTY_FUNCTION__, up->sg_str, | |
335 | up->rpf.source_nexthop.interface->name); | |
d62a17ae | 336 | } |
7c591950 DS |
337 | } |
338 | ||
339 | if (rpf_result == PIM_RPF_CHANGED) { | |
340 | struct pim_neighbor *nbr; | |
d62a17ae | 341 | |
7c591950 DS |
342 | nbr = pim_neighbor_find(old.source_nexthop.interface, |
343 | old.rpf_addr.u.prefix4); | |
344 | if (nbr) | |
345 | pim_jp_agg_remove_group(nbr->upstream_jp_agg, up); | |
d62a17ae | 346 | |
7c591950 DS |
347 | /* |
348 | * We have detected a case where we might need to rescan | |
349 | * the inherited o_list so do it. | |
350 | */ | |
351 | if (up->channel_oil | |
352 | && up->channel_oil->oil_inherited_rescan) { | |
353 | pim_upstream_inherited_olist_decide(pim, up); | |
354 | up->channel_oil->oil_inherited_rescan = 0; | |
355 | } | |
d62a17ae | 356 | |
7c591950 | 357 | if (up->join_state == PIM_UPSTREAM_JOINED) { |
d62a17ae | 358 | /* |
7c591950 DS |
359 | * If we come up real fast we can be here |
360 | * where the mroute has not been installed | |
361 | * so install it. | |
d62a17ae | 362 | */ |
363 | if (up->channel_oil | |
7c591950 DS |
364 | && !up->channel_oil->installed) |
365 | pim_mroute_add(up->channel_oil, | |
366 | __PRETTY_FUNCTION__); | |
d62a17ae | 367 | |
7c591950 DS |
368 | /* |
369 | * RFC 4601: 4.5.7. Sending (S,G) Join/Prune Messages | |
370 | * | |
371 | * Transitions from Joined State | |
372 | * | |
373 | * RPF'(S,G) changes not due to an Assert | |
374 | * | |
375 | * The upstream (S,G) state machine remains in Joined | |
376 | * state. Send Join(S,G) to the new upstream | |
377 | * neighbor, which is the new value of RPF'(S,G). | |
378 | * Send Prune(S,G) to the old upstream neighbor, which | |
379 | * is the old value of RPF'(S,G). Set the Join | |
380 | * Timer (JT) to expire after t_periodic seconds. | |
381 | */ | |
382 | pim_jp_agg_switch_interface(&old, &up->rpf, up); | |
d62a17ae | 383 | |
7c591950 DS |
384 | pim_upstream_join_timer_restart(up, &old); |
385 | } /* up->join_state == PIM_UPSTREAM_JOINED */ | |
386 | ||
387 | /* | |
388 | * FIXME can join_desired actually be changed by | |
389 | * pim_rpf_update() returning PIM_RPF_CHANGED ? | |
390 | */ | |
391 | pim_upstream_update_join_desired(pim, up); | |
392 | ||
393 | } /* PIM_RPF_CHANGED */ | |
394 | ||
395 | if (PIM_DEBUG_PIM_NHT) { | |
396 | zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s", | |
397 | __PRETTY_FUNCTION__, up->sg_str, pim->vrf->name, | |
398 | old.source_nexthop.interface->name, | |
399 | up->rpf.source_nexthop.interface->name); | |
400 | } | |
401 | ||
402 | return HASHWALK_CONTINUE; | |
403 | } | |
404 | ||
405 | static int pim_update_upstream_nh(struct pim_instance *pim, | |
406 | struct pim_nexthop_cache *pnc) | |
407 | { | |
408 | struct listnode *node, *ifnode; | |
409 | struct interface *ifp; | |
410 | ||
411 | hash_walk(pnc->upstream_hash, pim_update_upstream_nh_helper, pim); | |
d62a17ae | 412 | |
25b787a2 | 413 | for (ALL_LIST_ELEMENTS_RO(vrf_iflist(pim->vrf_id), ifnode, ifp)) |
d62a17ae | 414 | if (ifp->info) { |
415 | struct pim_interface *pim_ifp = ifp->info; | |
416 | struct pim_iface_upstream_switch *us; | |
417 | ||
418 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->upstream_switch_list, | |
419 | node, us)) { | |
420 | struct pim_rpf rpf; | |
421 | rpf.source_nexthop.interface = ifp; | |
422 | rpf.rpf_addr.u.prefix4 = us->address; | |
423 | pim_joinprune_send(&rpf, us->us); | |
424 | pim_jp_agg_clear_group(us->us); | |
425 | } | |
426 | } | |
427 | ||
428 | return 0; | |
1bc98276 CS |
429 | } |
430 | ||
d62a17ae | 431 | uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp) |
633988a7 | 432 | { |
d62a17ae | 433 | uint32_t hash_val; |
434 | uint32_t s = 0, g = 0; | |
435 | ||
436 | if ((!src)) | |
437 | return 0; | |
438 | ||
439 | switch (src->family) { | |
440 | case AF_INET: { | |
441 | s = src->u.prefix4.s_addr; | |
442 | s = s == 0 ? 1 : s; | |
443 | if (grp) | |
444 | g = grp->u.prefix4.s_addr; | |
445 | } break; | |
446 | default: | |
447 | break; | |
448 | } | |
449 | ||
450 | hash_val = jhash_2words(g, s, 101); | |
d62a17ae | 451 | return hash_val; |
633988a7 CS |
452 | } |
453 | ||
25b787a2 DS |
454 | int pim_ecmp_nexthop_search(struct pim_instance *pim, |
455 | struct pim_nexthop_cache *pnc, | |
d62a17ae | 456 | struct pim_nexthop *nexthop, struct prefix *src, |
457 | struct prefix *grp, int neighbor_needed) | |
633988a7 | 458 | { |
d62a17ae | 459 | struct pim_neighbor *nbr = NULL; |
460 | struct nexthop *nh_node = NULL; | |
461 | ifindex_t first_ifindex; | |
462 | struct interface *ifp = NULL; | |
463 | uint32_t hash_val = 0, mod_val = 0; | |
464 | uint8_t nh_iter = 0, found = 0; | |
465 | ||
466 | if (!pnc || !pnc->nexthop_num || !nexthop) | |
cb9c7c50 | 467 | return 0; |
d62a17ae | 468 | |
469 | // Current Nexthop is VALID, check to stay on the current path. | |
470 | if (nexthop->interface && nexthop->interface->info | |
471 | && nexthop->mrib_nexthop_addr.u.prefix4.s_addr | |
472 | != PIM_NET_INADDR_ANY) { | |
473 | /* User configured knob to explicitly switch | |
474 | to new path is disabled or current path | |
475 | metric is less than nexthop update. | |
476 | */ | |
477 | ||
478 | if (qpim_ecmp_rebalance_enable == 0) { | |
479 | uint8_t curr_route_valid = 0; | |
480 | // Check if current nexthop is present in new updated | |
481 | // Nexthop list. | |
482 | // If the current nexthop is not valid, candidate to | |
483 | // choose new Nexthop. | |
484 | for (nh_node = pnc->nexthop; nh_node; | |
1b5f8a1a | 485 | nh_node = nh_node->next) { |
d62a17ae | 486 | curr_route_valid = (nexthop->interface->ifindex |
487 | == nh_node->ifindex); | |
1b5f8a1a DS |
488 | if (curr_route_valid) |
489 | break; | |
490 | } | |
d62a17ae | 491 | |
492 | if (curr_route_valid | |
493 | && !pim_if_connected_to_source(nexthop->interface, | |
494 | src->u.prefix4)) { | |
495 | nbr = pim_neighbor_find( | |
496 | nexthop->interface, | |
497 | nexthop->mrib_nexthop_addr.u.prefix4); | |
498 | if (!nbr | |
499 | && !if_is_loopback(nexthop->interface)) { | |
5cef40fc | 500 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 501 | zlog_debug( |
502 | "%s: current nexthop does not have nbr ", | |
503 | __PRETTY_FUNCTION__); | |
504 | } else { | |
5cef40fc | 505 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 506 | char src_str[INET_ADDRSTRLEN]; |
507 | pim_inet4_dump("<addr?>", | |
508 | src->u.prefix4, | |
509 | src_str, | |
510 | sizeof(src_str)); | |
511 | char grp_str[INET_ADDRSTRLEN]; | |
512 | pim_inet4_dump("<addr?>", | |
513 | grp->u.prefix4, | |
514 | grp_str, | |
515 | sizeof(grp_str)); | |
516 | zlog_debug( | |
5cef40fc | 517 | "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection", |
d62a17ae | 518 | __PRETTY_FUNCTION__, |
519 | src_str, grp_str, | |
5cef40fc | 520 | pim->vrf->name, |
d62a17ae | 521 | nexthop->interface->name); |
522 | } | |
523 | return 0; | |
524 | } | |
525 | } | |
526 | } | |
527 | } | |
528 | if (qpim_ecmp_enable) { | |
529 | // PIM ECMP flag is enable then choose ECMP path. | |
530 | hash_val = pim_compute_ecmp_hash(src, grp); | |
531 | mod_val = hash_val % pnc->nexthop_num; | |
d62a17ae | 532 | } |
533 | ||
534 | for (nh_node = pnc->nexthop; nh_node && (found == 0); | |
535 | nh_node = nh_node->next) { | |
536 | first_ifindex = nh_node->ifindex; | |
25b787a2 | 537 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); |
d62a17ae | 538 | if (!ifp) { |
5cef40fc | 539 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 540 | char addr_str[INET_ADDRSTRLEN]; |
541 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
542 | addr_str, sizeof(addr_str)); | |
543 | zlog_debug( | |
5cef40fc | 544 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 545 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
546 | first_ifindex, addr_str, |
547 | pim->vrf->name); | |
d62a17ae | 548 | } |
549 | if (nh_iter == mod_val) | |
550 | mod_val++; // Select nexthpath | |
551 | nh_iter++; | |
552 | continue; | |
553 | } | |
554 | if (!ifp->info) { | |
5cef40fc | 555 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 556 | char addr_str[INET_ADDRSTRLEN]; |
557 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
558 | addr_str, sizeof(addr_str)); | |
559 | zlog_debug( | |
5cef40fc | 560 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 561 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
562 | pim->vrf->name, first_ifindex, |
563 | addr_str); | |
d62a17ae | 564 | } |
565 | if (nh_iter == mod_val) | |
566 | mod_val++; // Select nexthpath | |
567 | nh_iter++; | |
568 | continue; | |
569 | } | |
570 | ||
571 | if (neighbor_needed | |
572 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
573 | nbr = pim_neighbor_find(ifp, nh_node->gate.ipv4); | |
d62a17ae | 574 | if (!nbr && !if_is_loopback(ifp)) { |
5cef40fc | 575 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 576 | zlog_debug( |
5cef40fc DS |
577 | "%s: pim nbr not found on input interface %s(%s)", |
578 | __PRETTY_FUNCTION__, ifp->name, | |
579 | pim->vrf->name); | |
d62a17ae | 580 | if (nh_iter == mod_val) |
581 | mod_val++; // Select nexthpath | |
582 | nh_iter++; | |
583 | continue; | |
584 | } | |
585 | } | |
586 | ||
587 | if (nh_iter == mod_val) { | |
588 | nexthop->interface = ifp; | |
589 | nexthop->mrib_nexthop_addr.family = AF_INET; | |
590 | nexthop->mrib_nexthop_addr.prefixlen = IPV4_MAX_BITLEN; | |
591 | nexthop->mrib_nexthop_addr.u.prefix4 = | |
592 | nh_node->gate.ipv4; | |
593 | nexthop->mrib_metric_preference = pnc->distance; | |
594 | nexthop->mrib_route_metric = pnc->metric; | |
595 | nexthop->last_lookup = src->u.prefix4; | |
596 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
597 | nexthop->nbr = nbr; | |
598 | found = 1; | |
5cef40fc | 599 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 600 | char buf[INET_ADDRSTRLEN]; |
601 | char buf2[INET_ADDRSTRLEN]; | |
602 | char buf3[INET_ADDRSTRLEN]; | |
603 | pim_inet4_dump("<src?>", src->u.prefix4, buf2, | |
604 | sizeof(buf2)); | |
605 | pim_inet4_dump("<grp?>", grp->u.prefix4, buf3, | |
606 | sizeof(buf3)); | |
607 | pim_inet4_dump( | |
608 | "<rpf?>", | |
609 | nexthop->mrib_nexthop_addr.u.prefix4, | |
610 | buf, sizeof(buf)); | |
611 | zlog_debug( | |
5cef40fc | 612 | "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d", |
d62a17ae | 613 | __PRETTY_FUNCTION__, buf2, buf3, |
5cef40fc DS |
614 | pim->vrf->name, ifp->name, buf, mod_val, |
615 | nh_iter, qpim_ecmp_enable); | |
d62a17ae | 616 | } |
617 | } | |
618 | nh_iter++; | |
619 | } | |
620 | ||
621 | if (found) | |
cb9c7c50 | 622 | return 1; |
d62a17ae | 623 | else |
cb9c7c50 | 624 | return 0; |
633988a7 CS |
625 | } |
626 | ||
d62a17ae | 627 | /* This API is used to parse Registered address nexthop update coming from Zebra |
628 | */ | |
629 | int pim_parse_nexthop_update(int command, struct zclient *zclient, | |
630 | zebra_size_t length, vrf_id_t vrf_id) | |
1bc98276 | 631 | { |
d62a17ae | 632 | struct stream *s; |
633 | struct prefix p; | |
634 | struct nexthop *nexthop; | |
635 | struct nexthop *nhlist_head = NULL; | |
636 | struct nexthop *nhlist_tail = NULL; | |
637 | uint32_t metric, distance; | |
638 | u_char nexthop_num = 0; | |
639 | int i; | |
640 | struct pim_rpf rpf; | |
641 | struct pim_nexthop_cache *pnc = NULL; | |
642 | struct pim_neighbor *nbr = NULL; | |
643 | struct interface *ifp = NULL; | |
644 | struct interface *ifp1 = NULL; | |
cf663ceb DS |
645 | struct vrf *vrf = vrf_lookup_by_id(vrf_id); |
646 | struct pim_instance *pim = vrf->info; | |
d62a17ae | 647 | |
648 | s = zclient->ibuf; | |
649 | memset(&p, 0, sizeof(struct prefix)); | |
650 | p.family = stream_getw(s); | |
651 | p.prefixlen = stream_getc(s); | |
652 | switch (p.family) { | |
653 | case AF_INET: | |
654 | p.u.prefix4.s_addr = stream_get_ipv4(s); | |
655 | break; | |
656 | case AF_INET6: | |
657 | stream_get(&p.u.prefix6, s, 16); | |
658 | break; | |
659 | default: | |
660 | break; | |
661 | } | |
662 | ||
663 | if (command == ZEBRA_NEXTHOP_UPDATE) { | |
664 | rpf.rpf_addr.family = p.family; | |
665 | rpf.rpf_addr.prefixlen = p.prefixlen; | |
666 | rpf.rpf_addr.u.prefix4.s_addr = p.u.prefix4.s_addr; | |
25b787a2 | 667 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 668 | if (!pnc) { |
5cef40fc | 669 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 670 | char buf[PREFIX2STR_BUFFER]; |
671 | prefix2str(&rpf.rpf_addr, buf, sizeof(buf)); | |
672 | zlog_debug( | |
673 | "%s: Skipping NHT update, addr %s is not in local cached DB.", | |
674 | __PRETTY_FUNCTION__, buf); | |
675 | } | |
676 | return 0; | |
677 | } | |
678 | } else { | |
679 | /* | |
680 | * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE | |
681 | */ | |
682 | return 0; | |
683 | } | |
684 | ||
685 | pnc->last_update = pim_time_monotonic_usec(); | |
686 | distance = stream_getc(s); | |
687 | metric = stream_getl(s); | |
688 | nexthop_num = stream_getc(s); | |
689 | ||
690 | if (nexthop_num) { | |
691 | pnc->nexthop_num = 0; // Only increment for pim enabled rpf. | |
692 | ||
693 | for (i = 0; i < nexthop_num; i++) { | |
694 | nexthop = nexthop_new(); | |
695 | nexthop->type = stream_getc(s); | |
696 | switch (nexthop->type) { | |
697 | case NEXTHOP_TYPE_IPV4: | |
698 | nexthop->gate.ipv4.s_addr = stream_get_ipv4(s); | |
699 | nexthop->ifindex = stream_getl(s); | |
700 | break; | |
701 | case NEXTHOP_TYPE_IFINDEX: | |
702 | nexthop->ifindex = stream_getl(s); | |
703 | break; | |
704 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
705 | nexthop->gate.ipv4.s_addr = stream_get_ipv4(s); | |
706 | nexthop->ifindex = stream_getl(s); | |
707 | break; | |
708 | case NEXTHOP_TYPE_IPV6: | |
709 | stream_get(&nexthop->gate.ipv6, s, 16); | |
710 | break; | |
711 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
712 | stream_get(&nexthop->gate.ipv6, s, 16); | |
713 | nexthop->ifindex = stream_getl(s); | |
714 | ifp1 = if_lookup_by_index(nexthop->ifindex, | |
25b787a2 | 715 | pim->vrf_id); |
d62a17ae | 716 | nbr = pim_neighbor_find_if(ifp1); |
717 | /* Overwrite with Nbr address as NH addr */ | |
5cef40fc | 718 | if (nbr) |
d62a17ae | 719 | nexthop->gate.ipv4 = nbr->source_addr; |
5cef40fc | 720 | else { |
d62a17ae | 721 | // Mark nexthop address to 0 until PIM |
722 | // Nbr is resolved. | |
723 | nexthop->gate.ipv4.s_addr = | |
724 | PIM_NET_INADDR_ANY; | |
725 | } | |
726 | ||
727 | break; | |
728 | default: | |
729 | /* do nothing */ | |
730 | break; | |
731 | } | |
732 | ||
25b787a2 | 733 | ifp = if_lookup_by_index(nexthop->ifindex, pim->vrf_id); |
d62a17ae | 734 | if (!ifp) { |
5cef40fc | 735 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 736 | char buf[NEXTHOP_STRLEN]; |
737 | zlog_debug( | |
5cef40fc | 738 | "%s: could not find interface for ifindex %d(%s) (addr %s)", |
d62a17ae | 739 | __PRETTY_FUNCTION__, |
740 | nexthop->ifindex, | |
5cef40fc | 741 | pim->vrf->name, |
d62a17ae | 742 | nexthop2str(nexthop, buf, |
743 | sizeof(buf))); | |
744 | } | |
745 | nexthop_free(nexthop); | |
746 | continue; | |
747 | } | |
748 | ||
1b5f8a1a DS |
749 | if (PIM_DEBUG_PIM_NHT) { |
750 | char p_str[PREFIX2STR_BUFFER]; | |
751 | prefix2str(&p, p_str, sizeof(p_str)); | |
752 | zlog_debug( | |
753 | "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ", | |
754 | __PRETTY_FUNCTION__, p_str, | |
755 | pim->vrf->name, i + 1, | |
756 | inet_ntoa(nexthop->gate.ipv4), | |
757 | ifp->name, nexthop->type, distance, | |
758 | metric); | |
759 | } | |
760 | ||
d62a17ae | 761 | if (!ifp->info) { |
5cef40fc | 762 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 763 | char buf[NEXTHOP_STRLEN]; |
764 | zlog_debug( | |
5cef40fc | 765 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)", |
d62a17ae | 766 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 767 | pim->vrf->name, |
d62a17ae | 768 | nexthop->ifindex, |
769 | nexthop2str(nexthop, buf, | |
770 | sizeof(buf))); | |
771 | } | |
772 | nexthop_free(nexthop); | |
773 | continue; | |
774 | } | |
775 | ||
776 | if (nhlist_tail) { | |
777 | nhlist_tail->next = nexthop; | |
778 | nhlist_tail = nexthop; | |
779 | } else { | |
780 | nhlist_tail = nexthop; | |
781 | nhlist_head = nexthop; | |
782 | } | |
783 | // Only keep track of nexthops which are PIM enabled. | |
784 | pnc->nexthop_num++; | |
785 | } | |
786 | /* Reset existing pnc->nexthop before assigning new list */ | |
787 | nexthops_free(pnc->nexthop); | |
788 | pnc->nexthop = nhlist_head; | |
789 | if (pnc->nexthop_num) { | |
790 | pnc->flags |= PIM_NEXTHOP_VALID; | |
791 | pnc->distance = distance; | |
792 | pnc->metric = metric; | |
793 | } | |
794 | } else { | |
795 | pnc->flags &= ~PIM_NEXTHOP_VALID; | |
796 | pnc->nexthop_num = nexthop_num; | |
797 | nexthops_free(pnc->nexthop); | |
798 | pnc->nexthop = NULL; | |
799 | } | |
800 | ||
5cef40fc | 801 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 802 | char buf[PREFIX2STR_BUFFER]; |
803 | prefix2str(&p, buf, sizeof(buf)); | |
804 | zlog_debug( | |
7c591950 | 805 | "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%d up %ld rp %d", |
5cef40fc | 806 | __PRETTY_FUNCTION__, buf, pim->vrf->name, nexthop_num, |
7c591950 | 807 | pnc->nexthop_num, vrf_id, pnc->upstream_hash->count, |
d62a17ae | 808 | listcount(pnc->rp_list)); |
809 | } | |
810 | ||
811 | pim_rpf_set_refresh_time(); | |
812 | ||
813 | if (listcount(pnc->rp_list)) | |
25b787a2 | 814 | pim_update_rp_nh(pim, pnc); |
7c591950 | 815 | if (pnc->upstream_hash->count) |
cf663ceb | 816 | pim_update_upstream_nh(pim, pnc); |
d62a17ae | 817 | |
818 | return 0; | |
1bc98276 | 819 | } |
633988a7 | 820 | |
25b787a2 DS |
821 | int pim_ecmp_nexthop_lookup(struct pim_instance *pim, |
822 | struct pim_nexthop *nexthop, struct in_addr addr, | |
d62a17ae | 823 | struct prefix *src, struct prefix *grp, |
824 | int neighbor_needed) | |
633988a7 | 825 | { |
d62a17ae | 826 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
827 | struct pim_neighbor *nbr = NULL; | |
828 | int num_ifindex; | |
829 | struct interface *ifp; | |
830 | int first_ifindex; | |
831 | int found = 0; | |
832 | uint8_t i = 0; | |
833 | uint32_t hash_val = 0, mod_val = 0; | |
834 | ||
5cef40fc | 835 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 836 | char addr_str[INET_ADDRSTRLEN]; |
837 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
5cef40fc DS |
838 | zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld", |
839 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name, | |
d62a17ae | 840 | nexthop->last_lookup_time); |
841 | } | |
842 | ||
843 | memset(nexthop_tab, 0, | |
844 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
71edad0f DS |
845 | num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, |
846 | addr, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 847 | if (num_ifindex < 1) { |
848 | char addr_str[INET_ADDRSTRLEN]; | |
849 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
850 | zlog_warn( | |
5cef40fc DS |
851 | "%s %s: could not find nexthop ifindex for address %s(%s)", |
852 | __FILE__, __PRETTY_FUNCTION__, addr_str, | |
853 | pim->vrf->name); | |
cb9c7c50 | 854 | return 0; |
d62a17ae | 855 | } |
856 | ||
857 | // If PIM ECMP enable then choose ECMP path. | |
858 | if (qpim_ecmp_enable) { | |
859 | hash_val = pim_compute_ecmp_hash(src, grp); | |
860 | mod_val = hash_val % num_ifindex; | |
5cef40fc | 861 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 862 | zlog_debug("%s: hash_val %u mod_val %u", |
863 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
864 | } | |
865 | ||
866 | while (!found && (i < num_ifindex)) { | |
867 | first_ifindex = nexthop_tab[i].ifindex; | |
868 | ||
25b787a2 | 869 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); |
d62a17ae | 870 | if (!ifp) { |
5cef40fc | 871 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 872 | char addr_str[INET_ADDRSTRLEN]; |
873 | pim_inet4_dump("<addr?>", addr, addr_str, | |
874 | sizeof(addr_str)); | |
875 | zlog_debug( | |
5cef40fc | 876 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 877 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
878 | first_ifindex, addr_str, |
879 | pim->vrf->name); | |
d62a17ae | 880 | } |
881 | if (i == mod_val) | |
882 | mod_val++; | |
883 | i++; | |
884 | continue; | |
885 | } | |
886 | ||
887 | if (!ifp->info) { | |
5cef40fc | 888 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 889 | char addr_str[INET_ADDRSTRLEN]; |
890 | pim_inet4_dump("<addr?>", addr, addr_str, | |
891 | sizeof(addr_str)); | |
892 | zlog_debug( | |
5cef40fc | 893 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 894 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
895 | pim->vrf->name, first_ifindex, |
896 | addr_str); | |
d62a17ae | 897 | } |
898 | if (i == mod_val) | |
899 | mod_val++; | |
900 | i++; | |
901 | continue; | |
902 | } | |
903 | if (neighbor_needed && !pim_if_connected_to_source(ifp, addr)) { | |
904 | nbr = pim_neighbor_find( | |
905 | ifp, nexthop_tab[i].nexthop_addr.u.prefix4); | |
5cef40fc DS |
906 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
907 | zlog_debug("ifp name: %s(%s), pim nbr: %p", | |
908 | ifp->name, pim->vrf->name, nbr); | |
d62a17ae | 909 | if (!nbr && !if_is_loopback(ifp)) { |
910 | if (i == mod_val) | |
911 | mod_val++; | |
912 | i++; | |
5cef40fc | 913 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 914 | char addr_str[INET_ADDRSTRLEN]; |
915 | pim_inet4_dump("<addr?>", addr, | |
916 | addr_str, | |
917 | sizeof(addr_str)); | |
918 | zlog_debug( | |
5cef40fc | 919 | "%s: NBR not found on input interface %s(%s) (RPF for source %s)", |
d62a17ae | 920 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 921 | pim->vrf->name, addr_str); |
d62a17ae | 922 | } |
923 | continue; | |
924 | } | |
925 | } | |
926 | ||
927 | if (i == mod_val) { | |
5cef40fc | 928 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 929 | char nexthop_str[PREFIX_STRLEN]; |
930 | char addr_str[INET_ADDRSTRLEN]; | |
931 | pim_addr_dump("<nexthop?>", | |
932 | &nexthop_tab[i].nexthop_addr, | |
933 | nexthop_str, sizeof(nexthop_str)); | |
934 | pim_inet4_dump("<addr?>", addr, addr_str, | |
935 | sizeof(addr_str)); | |
936 | zlog_debug( | |
5cef40fc DS |
937 | "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d", |
938 | __PRETTY_FUNCTION__, nexthop_str, | |
939 | addr_str, ifp->name, pim->vrf->name, | |
d62a17ae | 940 | nexthop_tab[i].route_metric, |
941 | nexthop_tab[i].protocol_distance); | |
942 | } | |
943 | /* update nextop data */ | |
944 | nexthop->interface = ifp; | |
945 | nexthop->mrib_nexthop_addr = | |
946 | nexthop_tab[i].nexthop_addr; | |
947 | nexthop->mrib_metric_preference = | |
948 | nexthop_tab[i].protocol_distance; | |
949 | nexthop->mrib_route_metric = | |
950 | nexthop_tab[i].route_metric; | |
951 | nexthop->last_lookup = addr; | |
952 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
953 | nexthop->nbr = nbr; | |
954 | found = 1; | |
955 | } | |
956 | i++; | |
957 | } | |
cb9c7c50 | 958 | |
d62a17ae | 959 | if (found) |
cb9c7c50 | 960 | return 1; |
d62a17ae | 961 | else |
cb9c7c50 | 962 | return 0; |
633988a7 | 963 | } |
815c33c9 | 964 | |
25b787a2 DS |
965 | int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim, |
966 | struct in_addr addr, struct prefix *src, | |
d62a17ae | 967 | struct prefix *grp) |
815c33c9 | 968 | { |
d62a17ae | 969 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
970 | int num_ifindex; | |
971 | int vif_index; | |
972 | ifindex_t first_ifindex; | |
973 | uint32_t hash_val = 0, mod_val = 0; | |
974 | ||
975 | memset(nexthop_tab, 0, | |
976 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
71edad0f DS |
977 | num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, |
978 | addr, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 979 | if (num_ifindex < 1) { |
5cef40fc | 980 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 981 | char addr_str[INET_ADDRSTRLEN]; |
982 | pim_inet4_dump("<addr?>", addr, addr_str, | |
983 | sizeof(addr_str)); | |
984 | zlog_debug( | |
5cef40fc DS |
985 | "%s: could not find nexthop ifindex for address %s(%s)", |
986 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); | |
d62a17ae | 987 | } |
988 | return -1; | |
989 | } | |
990 | ||
991 | // If PIM ECMP enable then choose ECMP path. | |
992 | if (qpim_ecmp_enable) { | |
993 | hash_val = pim_compute_ecmp_hash(src, grp); | |
994 | mod_val = hash_val % num_ifindex; | |
5cef40fc | 995 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 996 | zlog_debug("%s: hash_val %u mod_val %u", |
997 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
998 | } | |
999 | ||
1000 | first_ifindex = nexthop_tab[mod_val].ifindex; | |
1001 | ||
5cef40fc | 1002 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 1003 | char addr_str[INET_ADDRSTRLEN]; |
1004 | pim_inet4_dump("<ifaddr?>", addr, addr_str, sizeof(addr_str)); | |
1005 | zlog_debug( | |
5cef40fc DS |
1006 | "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s", |
1007 | __PRETTY_FUNCTION__, first_ifindex, | |
1008 | ifindex2ifname(first_ifindex, pim->vrf_id), | |
1009 | pim->vrf->name, addr_str); | |
d62a17ae | 1010 | } |
1011 | ||
7cfc7bcf | 1012 | vif_index = pim_if_find_vifindex_by_ifindex(pim, first_ifindex); |
d62a17ae | 1013 | |
1014 | if (vif_index < 0) { | |
5cef40fc | 1015 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 1016 | char addr_str[INET_ADDRSTRLEN]; |
1017 | pim_inet4_dump("<addr?>", addr, addr_str, | |
1018 | sizeof(addr_str)); | |
1019 | zlog_debug( | |
5cef40fc DS |
1020 | "%s: low vif_index=%d(%s) < 1 nexthop for address %s", |
1021 | __PRETTY_FUNCTION__, vif_index, pim->vrf->name, | |
d62a17ae | 1022 | addr_str); |
1023 | } | |
1024 | return -2; | |
1025 | } | |
1026 | ||
1027 | return vif_index; | |
815c33c9 | 1028 | } |