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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" |
640b8d93 | 42 | #include "pim_rp.h" |
1bc98276 CS |
43 | |
44 | /** | |
45 | * pim_sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister | |
46 | * command to Zebra. | |
47 | */ | |
64c86530 | 48 | void pim_sendmsg_zebra_rnh(struct pim_instance *pim, struct zclient *zclient, |
d62a17ae | 49 | struct pim_nexthop_cache *pnc, int command) |
1bc98276 | 50 | { |
d62a17ae | 51 | struct prefix *p; |
52 | int ret; | |
53 | ||
d62a17ae | 54 | p = &(pnc->rpf.rpf_addr); |
3c192540 | 55 | ret = zclient_send_rnh(zclient, command, p, false, pim->vrf_id); |
d62a17ae | 56 | if (ret < 0) |
57 | zlog_warn("sendmsg_nexthop: zclient_send_message() failed"); | |
58 | ||
5cef40fc | 59 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 60 | char buf[PREFIX2STR_BUFFER]; |
61 | prefix2str(p, buf, sizeof(buf)); | |
5cef40fc DS |
62 | zlog_debug( |
63 | "%s: NHT %sregistered addr %s(%s) with Zebra ret:%d ", | |
64 | __PRETTY_FUNCTION__, | |
65 | (command == ZEBRA_NEXTHOP_REGISTER) ? " " : "de", buf, | |
66 | pim->vrf->name, ret); | |
d62a17ae | 67 | } |
68 | ||
69 | return; | |
1bc98276 CS |
70 | } |
71 | ||
d0a4f55d DS |
72 | struct pim_nexthop_cache *pim_nexthop_cache_find(struct pim_instance *pim, |
73 | struct pim_rpf *rpf) | |
1bc98276 | 74 | { |
d62a17ae | 75 | struct pim_nexthop_cache *pnc = NULL; |
76 | struct pim_nexthop_cache lookup; | |
1bc98276 | 77 | |
d62a17ae | 78 | lookup.rpf.rpf_addr.family = rpf->rpf_addr.family; |
79 | lookup.rpf.rpf_addr.prefixlen = rpf->rpf_addr.prefixlen; | |
80 | lookup.rpf.rpf_addr.u.prefix4.s_addr = rpf->rpf_addr.u.prefix4.s_addr; | |
1bc98276 | 81 | |
d0a4f55d | 82 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
1bc98276 | 83 | |
d62a17ae | 84 | return pnc; |
1bc98276 CS |
85 | } |
86 | ||
5cef40fc DS |
87 | static struct pim_nexthop_cache *pim_nexthop_cache_add(struct pim_instance *pim, |
88 | struct pim_rpf *rpf_addr) | |
1bc98276 | 89 | { |
d62a17ae | 90 | struct pim_nexthop_cache *pnc; |
9fb302f4 DS |
91 | char hash_name[64]; |
92 | char buf1[64]; | |
d62a17ae | 93 | |
94 | pnc = XCALLOC(MTYPE_PIM_NEXTHOP_CACHE, | |
95 | sizeof(struct pim_nexthop_cache)); | |
d62a17ae | 96 | pnc->rpf.rpf_addr.family = rpf_addr->rpf_addr.family; |
97 | pnc->rpf.rpf_addr.prefixlen = rpf_addr->rpf_addr.prefixlen; | |
98 | pnc->rpf.rpf_addr.u.prefix4.s_addr = | |
99 | rpf_addr->rpf_addr.u.prefix4.s_addr; | |
100 | ||
d0a4f55d | 101 | pnc = hash_get(pim->rpf_hash, pnc, hash_alloc_intern); |
d62a17ae | 102 | |
103 | pnc->rp_list = list_new(); | |
104 | pnc->rp_list->cmp = pim_rp_list_cmp; | |
105 | ||
9fb302f4 | 106 | snprintf(hash_name, 64, "PNC %s(%s) Upstream Hash", |
996c9314 | 107 | prefix2str(&pnc->rpf.rpf_addr, buf1, 64), pim->vrf->name); |
7c591950 | 108 | pnc->upstream_hash = hash_create_size(8192, pim_upstream_hash_key, |
996c9314 | 109 | pim_upstream_equal, hash_name); |
d62a17ae | 110 | |
d62a17ae | 111 | return pnc; |
1bc98276 CS |
112 | } |
113 | ||
cb9c7c50 DS |
114 | /* |
115 | * pim_find_or_track_nexthop | |
116 | * | |
117 | * This API is used to Register an address with Zebra | |
118 | * | |
119 | * 1 -> Success | |
120 | * 0 -> Failure | |
121 | */ | |
25bdac42 DS |
122 | int pim_find_or_track_nexthop(struct pim_instance *pim, struct prefix *addr, |
123 | struct pim_upstream *up, struct rp_info *rp, | |
4533b847 | 124 | bool bsr_track_needed, |
d62a17ae | 125 | struct pim_nexthop_cache *out_pnc) |
1bc98276 | 126 | { |
d62a17ae | 127 | struct pim_nexthop_cache *pnc = NULL; |
128 | struct pim_rpf rpf; | |
129 | struct listnode *ch_node = NULL; | |
130 | struct zclient *zclient = NULL; | |
131 | ||
132 | zclient = pim_zebra_zclient_get(); | |
133 | memset(&rpf, 0, sizeof(struct pim_rpf)); | |
134 | rpf.rpf_addr.family = addr->family; | |
135 | rpf.rpf_addr.prefixlen = addr->prefixlen; | |
136 | rpf.rpf_addr.u.prefix4 = addr->u.prefix4; | |
137 | ||
25bdac42 | 138 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 139 | if (!pnc) { |
25bdac42 | 140 | pnc = pim_nexthop_cache_add(pim, &rpf); |
5cef40fc DS |
141 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
142 | ZEBRA_NEXTHOP_REGISTER); | |
143 | if (PIM_DEBUG_PIM_NHT) { | |
144 | char buf[PREFIX2STR_BUFFER]; | |
145 | prefix2str(addr, buf, sizeof(buf)); | |
146 | zlog_debug( | |
147 | "%s: NHT cache and zebra notification added for %s(%s)", | |
148 | __PRETTY_FUNCTION__, buf, pim->vrf->name); | |
149 | } | |
d62a17ae | 150 | } |
151 | ||
152 | if (rp != NULL) { | |
153 | ch_node = listnode_lookup(pnc->rp_list, rp); | |
5cef40fc | 154 | if (ch_node == NULL) |
d62a17ae | 155 | listnode_add_sort(pnc->rp_list, rp); |
d62a17ae | 156 | } |
157 | ||
7c591950 | 158 | if (up != NULL) |
c31a793b | 159 | hash_get(pnc->upstream_hash, up, hash_alloc_intern); |
d62a17ae | 160 | |
4533b847 | 161 | if (bsr_track_needed) |
162 | pnc->bsr_tracking = true; | |
163 | ||
2b57b948 | 164 | if (CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) { |
43763b11 DS |
165 | if (out_pnc) |
166 | memcpy(out_pnc, pnc, sizeof(struct pim_nexthop_cache)); | |
d62a17ae | 167 | return 1; |
168 | } | |
169 | ||
170 | return 0; | |
1bc98276 CS |
171 | } |
172 | ||
d0a4f55d | 173 | void pim_delete_tracked_nexthop(struct pim_instance *pim, struct prefix *addr, |
4533b847 | 174 | struct pim_upstream *up, struct rp_info *rp, |
175 | bool del_bsr_tracking) | |
1bc98276 | 176 | { |
d62a17ae | 177 | struct pim_nexthop_cache *pnc = NULL; |
178 | struct pim_nexthop_cache lookup; | |
179 | struct zclient *zclient = NULL; | |
246445a3 SP |
180 | struct listnode *upnode = NULL; |
181 | struct pim_upstream *upstream = NULL; | |
d62a17ae | 182 | |
183 | zclient = pim_zebra_zclient_get(); | |
184 | ||
185 | /* Remove from RPF hash if it is the last entry */ | |
186 | lookup.rpf.rpf_addr = *addr; | |
d0a4f55d | 187 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
d62a17ae | 188 | if (pnc) { |
246445a3 SP |
189 | if (rp) { |
190 | /* Release the (*, G)upstream from pnc->upstream_hash, | |
191 | * whose Group belongs to the RP getting deleted | |
192 | */ | |
193 | for (ALL_LIST_ELEMENTS_RO(pim->upstream_list, upnode, | |
194 | upstream)) { | |
195 | struct prefix grp; | |
196 | struct rp_info *trp_info; | |
197 | ||
198 | if (upstream->sg.src.s_addr != INADDR_ANY) | |
199 | continue; | |
200 | ||
201 | grp.family = AF_INET; | |
202 | grp.prefixlen = IPV4_MAX_BITLEN; | |
203 | grp.u.prefix4 = upstream->sg.grp; | |
204 | ||
205 | trp_info = pim_rp_find_match_group(pim, &grp); | |
206 | if (trp_info == rp) | |
207 | hash_release(pnc->upstream_hash, | |
208 | upstream); | |
209 | } | |
d62a17ae | 210 | listnode_delete(pnc->rp_list, rp); |
246445a3 SP |
211 | } |
212 | ||
d62a17ae | 213 | if (up) |
7c591950 | 214 | hash_release(pnc->upstream_hash, up); |
d62a17ae | 215 | |
4533b847 | 216 | if (del_bsr_tracking) |
217 | pnc->bsr_tracking = false; | |
218 | ||
5cef40fc DS |
219 | if (PIM_DEBUG_PIM_NHT) { |
220 | char buf[PREFIX_STRLEN]; | |
221 | prefix2str(addr, buf, sizeof buf); | |
d62a17ae | 222 | zlog_debug( |
7c591950 | 223 | "%s: NHT %s(%s) rp_list count:%d upstream count:%ld", |
5cef40fc | 224 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
7c591950 | 225 | pnc->rp_list->count, pnc->upstream_hash->count); |
5cef40fc | 226 | } |
d62a17ae | 227 | |
228 | if (pnc->rp_list->count == 0 | |
4533b847 | 229 | && pnc->upstream_hash->count == 0 |
230 | && pnc->bsr_tracking == false) { | |
64c86530 | 231 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
d62a17ae | 232 | ZEBRA_NEXTHOP_UNREGISTER); |
233 | ||
6a154c88 | 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 | ||
640b8d93 SP |
245 | void pim_rp_nexthop_del(struct rp_info *rp_info) |
246 | { | |
247 | rp_info->rp.source_nexthop.interface = NULL; | |
248 | rp_info->rp.source_nexthop.mrib_nexthop_addr.u.prefix4.s_addr = | |
249 | PIM_NET_INADDR_ANY; | |
250 | rp_info->rp.source_nexthop.mrib_metric_preference = | |
251 | router->infinite_assert_metric.metric_preference; | |
252 | rp_info->rp.source_nexthop.mrib_route_metric = | |
253 | router->infinite_assert_metric.route_metric; | |
254 | } | |
255 | ||
1bc98276 | 256 | /* Update RP nexthop info based on Nexthop update received from Zebra.*/ |
a7f95c76 DS |
257 | static void pim_update_rp_nh(struct pim_instance *pim, |
258 | struct pim_nexthop_cache *pnc) | |
1bc98276 | 259 | { |
d62a17ae | 260 | struct listnode *node = NULL; |
261 | struct rp_info *rp_info = NULL; | |
d62a17ae | 262 | |
263 | /*Traverse RP list and update each RP Nexthop info */ | |
264 | for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) { | |
265 | if (rp_info->rp.rpf_addr.u.prefix4.s_addr == INADDR_NONE) | |
266 | continue; | |
267 | ||
268 | // Compute PIM RPF using cached nexthop | |
43763b11 DS |
269 | if (!pim_ecmp_nexthop_lookup(pim, &rp_info->rp.source_nexthop, |
270 | &rp_info->rp.rpf_addr, | |
271 | &rp_info->group, 1)) | |
640b8d93 | 272 | pim_rp_nexthop_del(rp_info); |
d62a17ae | 273 | } |
1bc98276 CS |
274 | } |
275 | ||
276 | /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/ | |
e3b78da8 | 277 | static int pim_update_upstream_nh_helper(struct hash_bucket *bucket, void *arg) |
1bc98276 | 278 | { |
7c591950 | 279 | struct pim_instance *pim = (struct pim_instance *)arg; |
e3b78da8 | 280 | struct pim_upstream *up = (struct pim_upstream *)bucket->data; |
d62a17ae | 281 | int vif_index = 0; |
282 | ||
7c591950 DS |
283 | enum pim_rpf_result rpf_result; |
284 | struct pim_rpf old; | |
d62a17ae | 285 | |
7c591950 DS |
286 | old.source_nexthop.interface = up->rpf.source_nexthop.interface; |
287 | rpf_result = pim_rpf_update(pim, up, &old, 0); | |
a7f95c76 | 288 | if (rpf_result == PIM_RPF_FAILURE) { |
1250cb5d | 289 | pim_upstream_rpf_clear(pim, up); |
7c591950 | 290 | return HASHWALK_CONTINUE; |
a7f95c76 | 291 | } |
d62a17ae | 292 | |
7c591950 | 293 | /* update kernel multicast forwarding cache (MFC) */ |
957d93ea | 294 | if (up->rpf.source_nexthop.interface) { |
7c591950 DS |
295 | ifindex_t ifindex = up->rpf.source_nexthop.interface->ifindex; |
296 | ||
297 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); | |
298 | /* Pass Current selected NH vif index to mroute download | |
299 | */ | |
300 | if (vif_index) | |
301 | pim_scan_individual_oil(up->channel_oil, vif_index); | |
302 | else { | |
303 | if (PIM_DEBUG_PIM_NHT) | |
304 | zlog_debug( | |
305 | "%s: NHT upstream %s channel_oil IIF %s vif_index is not valid", | |
306 | __PRETTY_FUNCTION__, up->sg_str, | |
307 | up->rpf.source_nexthop.interface->name); | |
d62a17ae | 308 | } |
7c591950 DS |
309 | } |
310 | ||
cc67ccf9 DS |
311 | if (rpf_result == PIM_RPF_CHANGED) |
312 | pim_zebra_upstream_rpf_changed(pim, up, &old); | |
d62a17ae | 313 | |
7c591950 DS |
314 | |
315 | if (PIM_DEBUG_PIM_NHT) { | |
316 | zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s", | |
957d93ea SP |
317 | __PRETTY_FUNCTION__, up->sg_str, pim->vrf->name, |
318 | old.source_nexthop.interface | |
319 | ? old.source_nexthop.interface->name : "Unknwon", | |
320 | up->rpf.source_nexthop.interface->name); | |
7c591950 DS |
321 | } |
322 | ||
323 | return HASHWALK_CONTINUE; | |
324 | } | |
325 | ||
326 | static int pim_update_upstream_nh(struct pim_instance *pim, | |
327 | struct pim_nexthop_cache *pnc) | |
328 | { | |
7c591950 | 329 | hash_walk(pnc->upstream_hash, pim_update_upstream_nh_helper, pim); |
d62a17ae | 330 | |
74389231 | 331 | pim_zebra_update_all_interfaces(pim); |
d62a17ae | 332 | |
333 | return 0; | |
1bc98276 CS |
334 | } |
335 | ||
d62a17ae | 336 | uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp) |
633988a7 | 337 | { |
d62a17ae | 338 | uint32_t hash_val; |
339 | uint32_t s = 0, g = 0; | |
340 | ||
341 | if ((!src)) | |
342 | return 0; | |
343 | ||
344 | switch (src->family) { | |
345 | case AF_INET: { | |
346 | s = src->u.prefix4.s_addr; | |
347 | s = s == 0 ? 1 : s; | |
348 | if (grp) | |
349 | g = grp->u.prefix4.s_addr; | |
350 | } break; | |
351 | default: | |
352 | break; | |
353 | } | |
354 | ||
355 | hash_val = jhash_2words(g, s, 101); | |
d62a17ae | 356 | return hash_val; |
633988a7 CS |
357 | } |
358 | ||
43763b11 DS |
359 | static int pim_ecmp_nexthop_search(struct pim_instance *pim, |
360 | struct pim_nexthop_cache *pnc, | |
361 | struct pim_nexthop *nexthop, | |
362 | struct prefix *src, struct prefix *grp, | |
363 | int neighbor_needed) | |
633988a7 | 364 | { |
c517178d | 365 | struct pim_neighbor *nbrs[MULTIPATH_NUM], *nbr = NULL; |
19967127 | 366 | struct interface *ifps[MULTIPATH_NUM]; |
d62a17ae | 367 | struct nexthop *nh_node = NULL; |
368 | ifindex_t first_ifindex; | |
369 | struct interface *ifp = NULL; | |
370 | uint32_t hash_val = 0, mod_val = 0; | |
371 | uint8_t nh_iter = 0, found = 0; | |
19967127 | 372 | uint32_t i, num_nbrs = 0; |
d62a17ae | 373 | |
374 | if (!pnc || !pnc->nexthop_num || !nexthop) | |
cb9c7c50 | 375 | return 0; |
d62a17ae | 376 | |
431f21d3 A |
377 | memset(&nbrs, 0, sizeof(nbrs)); |
378 | memset(&ifps, 0, sizeof(ifps)); | |
379 | ||
d62a17ae | 380 | // Current Nexthop is VALID, check to stay on the current path. |
381 | if (nexthop->interface && nexthop->interface->info | |
382 | && nexthop->mrib_nexthop_addr.u.prefix4.s_addr | |
383 | != PIM_NET_INADDR_ANY) { | |
384 | /* User configured knob to explicitly switch | |
385 | to new path is disabled or current path | |
386 | metric is less than nexthop update. | |
387 | */ | |
388 | ||
4795fff7 | 389 | if (pim->ecmp_rebalance_enable == 0) { |
d62a17ae | 390 | uint8_t curr_route_valid = 0; |
391 | // Check if current nexthop is present in new updated | |
392 | // Nexthop list. | |
393 | // If the current nexthop is not valid, candidate to | |
394 | // choose new Nexthop. | |
395 | for (nh_node = pnc->nexthop; nh_node; | |
1b5f8a1a | 396 | nh_node = nh_node->next) { |
d62a17ae | 397 | curr_route_valid = (nexthop->interface->ifindex |
398 | == nh_node->ifindex); | |
1b5f8a1a DS |
399 | if (curr_route_valid) |
400 | break; | |
401 | } | |
d62a17ae | 402 | |
403 | if (curr_route_valid | |
404 | && !pim_if_connected_to_source(nexthop->interface, | |
405 | src->u.prefix4)) { | |
406 | nbr = pim_neighbor_find( | |
407 | nexthop->interface, | |
408 | nexthop->mrib_nexthop_addr.u.prefix4); | |
409 | if (!nbr | |
410 | && !if_is_loopback(nexthop->interface)) { | |
5cef40fc | 411 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 412 | zlog_debug( |
413 | "%s: current nexthop does not have nbr ", | |
414 | __PRETTY_FUNCTION__); | |
415 | } else { | |
5cef40fc | 416 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 417 | char src_str[INET_ADDRSTRLEN]; |
418 | pim_inet4_dump("<addr?>", | |
419 | src->u.prefix4, | |
420 | src_str, | |
421 | sizeof(src_str)); | |
422 | char grp_str[INET_ADDRSTRLEN]; | |
423 | pim_inet4_dump("<addr?>", | |
424 | grp->u.prefix4, | |
425 | grp_str, | |
426 | sizeof(grp_str)); | |
427 | zlog_debug( | |
5cef40fc | 428 | "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection", |
d62a17ae | 429 | __PRETTY_FUNCTION__, |
430 | src_str, grp_str, | |
5cef40fc | 431 | pim->vrf->name, |
d62a17ae | 432 | nexthop->interface->name); |
433 | } | |
a7f95c76 | 434 | return 1; |
d62a17ae | 435 | } |
436 | } | |
437 | } | |
438 | } | |
19967127 DS |
439 | |
440 | /* | |
441 | * Look up all interfaces and neighbors, | |
442 | * store for later usage | |
443 | */ | |
444 | for (nh_node = pnc->nexthop, i = 0; nh_node; | |
445 | nh_node = nh_node->next, i++) { | |
446 | ifps[i] = if_lookup_by_index(nh_node->ifindex, pim->vrf_id); | |
447 | if (ifps[i]) { | |
448 | nbrs[i] = pim_neighbor_find(ifps[i], | |
449 | nh_node->gate.ipv4); | |
450 | if (nbrs[i] || pim_if_connected_to_source(ifps[i], | |
ff5d90c2 | 451 | |
19967127 DS |
452 | src->u.prefix4)) |
453 | num_nbrs++; | |
454 | } | |
455 | } | |
4795fff7 | 456 | if (pim->ecmp_enable) { |
19967127 DS |
457 | uint32_t consider = pnc->nexthop_num; |
458 | ||
459 | if (neighbor_needed && num_nbrs < consider) | |
460 | consider = num_nbrs; | |
461 | ||
462 | if (consider == 0) | |
463 | return 0; | |
464 | ||
d62a17ae | 465 | // PIM ECMP flag is enable then choose ECMP path. |
466 | hash_val = pim_compute_ecmp_hash(src, grp); | |
19967127 | 467 | mod_val = hash_val % consider; |
d62a17ae | 468 | } |
469 | ||
470 | for (nh_node = pnc->nexthop; nh_node && (found == 0); | |
471 | nh_node = nh_node->next) { | |
472 | first_ifindex = nh_node->ifindex; | |
19967127 | 473 | ifp = ifps[nh_iter]; |
d62a17ae | 474 | if (!ifp) { |
5cef40fc | 475 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 476 | char addr_str[INET_ADDRSTRLEN]; |
477 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
478 | addr_str, sizeof(addr_str)); | |
479 | zlog_debug( | |
5cef40fc | 480 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 481 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
482 | first_ifindex, addr_str, |
483 | pim->vrf->name); | |
d62a17ae | 484 | } |
485 | if (nh_iter == mod_val) | |
486 | mod_val++; // Select nexthpath | |
487 | nh_iter++; | |
488 | continue; | |
489 | } | |
490 | if (!ifp->info) { | |
5cef40fc | 491 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 492 | char addr_str[INET_ADDRSTRLEN]; |
493 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
494 | addr_str, sizeof(addr_str)); | |
495 | zlog_debug( | |
5cef40fc | 496 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 497 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
498 | pim->vrf->name, first_ifindex, |
499 | addr_str); | |
d62a17ae | 500 | } |
501 | if (nh_iter == mod_val) | |
502 | mod_val++; // Select nexthpath | |
503 | nh_iter++; | |
504 | continue; | |
505 | } | |
506 | ||
507 | if (neighbor_needed | |
508 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
19967127 | 509 | nbr = nbrs[nh_iter]; |
d62a17ae | 510 | if (!nbr && !if_is_loopback(ifp)) { |
5cef40fc | 511 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 512 | zlog_debug( |
5cef40fc DS |
513 | "%s: pim nbr not found on input interface %s(%s)", |
514 | __PRETTY_FUNCTION__, ifp->name, | |
515 | pim->vrf->name); | |
d62a17ae | 516 | if (nh_iter == mod_val) |
517 | mod_val++; // Select nexthpath | |
518 | nh_iter++; | |
519 | continue; | |
520 | } | |
521 | } | |
522 | ||
523 | if (nh_iter == mod_val) { | |
524 | nexthop->interface = ifp; | |
525 | nexthop->mrib_nexthop_addr.family = AF_INET; | |
526 | nexthop->mrib_nexthop_addr.prefixlen = IPV4_MAX_BITLEN; | |
527 | nexthop->mrib_nexthop_addr.u.prefix4 = | |
528 | nh_node->gate.ipv4; | |
529 | nexthop->mrib_metric_preference = pnc->distance; | |
530 | nexthop->mrib_route_metric = pnc->metric; | |
531 | nexthop->last_lookup = src->u.prefix4; | |
532 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
533 | nexthop->nbr = nbr; | |
534 | found = 1; | |
5cef40fc | 535 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 536 | char buf[INET_ADDRSTRLEN]; |
537 | char buf2[INET_ADDRSTRLEN]; | |
538 | char buf3[INET_ADDRSTRLEN]; | |
539 | pim_inet4_dump("<src?>", src->u.prefix4, buf2, | |
540 | sizeof(buf2)); | |
541 | pim_inet4_dump("<grp?>", grp->u.prefix4, buf3, | |
542 | sizeof(buf3)); | |
543 | pim_inet4_dump( | |
544 | "<rpf?>", | |
545 | nexthop->mrib_nexthop_addr.u.prefix4, | |
546 | buf, sizeof(buf)); | |
547 | zlog_debug( | |
5cef40fc | 548 | "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d", |
d62a17ae | 549 | __PRETTY_FUNCTION__, buf2, buf3, |
5cef40fc | 550 | pim->vrf->name, ifp->name, buf, mod_val, |
4795fff7 | 551 | nh_iter, pim->ecmp_enable); |
d62a17ae | 552 | } |
553 | } | |
554 | nh_iter++; | |
555 | } | |
556 | ||
557 | if (found) | |
cb9c7c50 | 558 | return 1; |
d62a17ae | 559 | else |
cb9c7c50 | 560 | return 0; |
633988a7 CS |
561 | } |
562 | ||
d62a17ae | 563 | /* This API is used to parse Registered address nexthop update coming from Zebra |
564 | */ | |
565 | int pim_parse_nexthop_update(int command, struct zclient *zclient, | |
566 | zebra_size_t length, vrf_id_t vrf_id) | |
1bc98276 | 567 | { |
d62a17ae | 568 | struct nexthop *nexthop; |
569 | struct nexthop *nhlist_head = NULL; | |
570 | struct nexthop *nhlist_tail = NULL; | |
d62a17ae | 571 | int i; |
572 | struct pim_rpf rpf; | |
573 | struct pim_nexthop_cache *pnc = NULL; | |
574 | struct pim_neighbor *nbr = NULL; | |
575 | struct interface *ifp = NULL; | |
576 | struct interface *ifp1 = NULL; | |
cf663ceb | 577 | struct vrf *vrf = vrf_lookup_by_id(vrf_id); |
819f099b | 578 | struct pim_instance *pim; |
4a749e2c | 579 | struct zapi_route nhr; |
819f099b DS |
580 | |
581 | if (!vrf) | |
582 | return 0; | |
583 | pim = vrf->info; | |
d62a17ae | 584 | |
7d30a959 DS |
585 | if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) { |
586 | if (PIM_DEBUG_PIM_NHT) | |
996c9314 LB |
587 | zlog_debug( |
588 | "%s: Decode of nexthop update from zebra failed", | |
589 | __PRETTY_FUNCTION__); | |
7d30a959 DS |
590 | return 0; |
591 | } | |
d62a17ae | 592 | |
593 | if (command == ZEBRA_NEXTHOP_UPDATE) { | |
4a749e2c | 594 | prefix_copy(&rpf.rpf_addr, &nhr.prefix); |
25b787a2 | 595 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 596 | if (!pnc) { |
5cef40fc | 597 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 598 | char buf[PREFIX2STR_BUFFER]; |
599 | prefix2str(&rpf.rpf_addr, buf, sizeof(buf)); | |
600 | zlog_debug( | |
601 | "%s: Skipping NHT update, addr %s is not in local cached DB.", | |
602 | __PRETTY_FUNCTION__, buf); | |
603 | } | |
604 | return 0; | |
605 | } | |
606 | } else { | |
607 | /* | |
608 | * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE | |
609 | */ | |
610 | return 0; | |
611 | } | |
612 | ||
613 | pnc->last_update = pim_time_monotonic_usec(); | |
d62a17ae | 614 | |
4a749e2c | 615 | if (nhr.nexthop_num) { |
d62a17ae | 616 | pnc->nexthop_num = 0; // Only increment for pim enabled rpf. |
617 | ||
4a749e2c DS |
618 | for (i = 0; i < nhr.nexthop_num; i++) { |
619 | nexthop = nexthop_from_zapi_nexthop(&nhr.nexthops[i]); | |
d62a17ae | 620 | switch (nexthop->type) { |
621 | case NEXTHOP_TYPE_IPV4: | |
d62a17ae | 622 | case NEXTHOP_TYPE_IPV4_IFINDEX: |
d62a17ae | 623 | case NEXTHOP_TYPE_IPV6: |
4a749e2c | 624 | case NEXTHOP_TYPE_BLACKHOLE: |
d62a17ae | 625 | break; |
66f5152f MB |
626 | case NEXTHOP_TYPE_IFINDEX: |
627 | /* | |
628 | * Connected route (i.e. no nexthop), use | |
629 | * RPF address from nexthop cache (i.e. | |
630 | * destination) as PIM nexthop. | |
631 | */ | |
56c1568b | 632 | nexthop->type = NEXTHOP_TYPE_IPV4_IFINDEX; |
66f5152f MB |
633 | nexthop->gate.ipv4 = |
634 | pnc->rpf.rpf_addr.u.prefix4; | |
635 | break; | |
d62a17ae | 636 | case NEXTHOP_TYPE_IPV6_IFINDEX: |
d62a17ae | 637 | ifp1 = if_lookup_by_index(nexthop->ifindex, |
25b787a2 | 638 | pim->vrf_id); |
d62a17ae | 639 | nbr = pim_neighbor_find_if(ifp1); |
640 | /* Overwrite with Nbr address as NH addr */ | |
5cef40fc | 641 | if (nbr) |
d62a17ae | 642 | nexthop->gate.ipv4 = nbr->source_addr; |
5cef40fc | 643 | else { |
d62a17ae | 644 | // Mark nexthop address to 0 until PIM |
645 | // Nbr is resolved. | |
646 | nexthop->gate.ipv4.s_addr = | |
647 | PIM_NET_INADDR_ANY; | |
648 | } | |
649 | ||
d62a17ae | 650 | break; |
651 | } | |
652 | ||
25b787a2 | 653 | ifp = if_lookup_by_index(nexthop->ifindex, pim->vrf_id); |
d62a17ae | 654 | if (!ifp) { |
5cef40fc | 655 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 656 | char buf[NEXTHOP_STRLEN]; |
657 | zlog_debug( | |
5cef40fc | 658 | "%s: could not find interface for ifindex %d(%s) (addr %s)", |
d62a17ae | 659 | __PRETTY_FUNCTION__, |
660 | nexthop->ifindex, | |
5cef40fc | 661 | pim->vrf->name, |
d62a17ae | 662 | nexthop2str(nexthop, buf, |
663 | sizeof(buf))); | |
664 | } | |
665 | nexthop_free(nexthop); | |
666 | continue; | |
667 | } | |
668 | ||
1b5f8a1a DS |
669 | if (PIM_DEBUG_PIM_NHT) { |
670 | char p_str[PREFIX2STR_BUFFER]; | |
4a749e2c DS |
671 | |
672 | prefix2str(&nhr.prefix, p_str, sizeof(p_str)); | |
1b5f8a1a DS |
673 | zlog_debug( |
674 | "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ", | |
675 | __PRETTY_FUNCTION__, p_str, | |
676 | pim->vrf->name, i + 1, | |
677 | inet_ntoa(nexthop->gate.ipv4), | |
4a749e2c DS |
678 | ifp->name, nexthop->type, nhr.distance, |
679 | nhr.metric); | |
1b5f8a1a DS |
680 | } |
681 | ||
d62a17ae | 682 | if (!ifp->info) { |
5cef40fc | 683 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 684 | char buf[NEXTHOP_STRLEN]; |
4a749e2c | 685 | |
d62a17ae | 686 | zlog_debug( |
5cef40fc | 687 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)", |
d62a17ae | 688 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 689 | pim->vrf->name, |
d62a17ae | 690 | nexthop->ifindex, |
691 | nexthop2str(nexthop, buf, | |
692 | sizeof(buf))); | |
693 | } | |
694 | nexthop_free(nexthop); | |
695 | continue; | |
696 | } | |
697 | ||
698 | if (nhlist_tail) { | |
699 | nhlist_tail->next = nexthop; | |
700 | nhlist_tail = nexthop; | |
701 | } else { | |
702 | nhlist_tail = nexthop; | |
703 | nhlist_head = nexthop; | |
704 | } | |
705 | // Only keep track of nexthops which are PIM enabled. | |
706 | pnc->nexthop_num++; | |
707 | } | |
708 | /* Reset existing pnc->nexthop before assigning new list */ | |
709 | nexthops_free(pnc->nexthop); | |
710 | pnc->nexthop = nhlist_head; | |
711 | if (pnc->nexthop_num) { | |
712 | pnc->flags |= PIM_NEXTHOP_VALID; | |
4a749e2c DS |
713 | pnc->distance = nhr.distance; |
714 | pnc->metric = nhr.metric; | |
d62a17ae | 715 | } |
716 | } else { | |
717 | pnc->flags &= ~PIM_NEXTHOP_VALID; | |
4a749e2c | 718 | pnc->nexthop_num = nhr.nexthop_num; |
d62a17ae | 719 | nexthops_free(pnc->nexthop); |
720 | pnc->nexthop = NULL; | |
721 | } | |
2cb7234f | 722 | SET_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED); |
d62a17ae | 723 | |
5cef40fc | 724 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 725 | char buf[PREFIX2STR_BUFFER]; |
4a749e2c | 726 | prefix2str(&nhr.prefix, buf, sizeof(buf)); |
d62a17ae | 727 | zlog_debug( |
87ad28f4 | 728 | "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d", |
4a749e2c DS |
729 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
730 | nhr.nexthop_num, pnc->nexthop_num, vrf_id, | |
996c9314 | 731 | pnc->upstream_hash->count, listcount(pnc->rp_list)); |
d62a17ae | 732 | } |
733 | ||
bfc92019 | 734 | pim_rpf_set_refresh_time(pim); |
d62a17ae | 735 | |
736 | if (listcount(pnc->rp_list)) | |
25b787a2 | 737 | pim_update_rp_nh(pim, pnc); |
7c591950 | 738 | if (pnc->upstream_hash->count) |
cf663ceb | 739 | pim_update_upstream_nh(pim, pnc); |
d62a17ae | 740 | |
741 | return 0; | |
1bc98276 | 742 | } |
633988a7 | 743 | |
25b787a2 | 744 | int pim_ecmp_nexthop_lookup(struct pim_instance *pim, |
b938537b DS |
745 | struct pim_nexthop *nexthop, struct prefix *src, |
746 | struct prefix *grp, int neighbor_needed) | |
633988a7 | 747 | { |
43763b11 | 748 | struct pim_nexthop_cache *pnc; |
d62a17ae | 749 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
19967127 | 750 | struct pim_neighbor *nbrs[MULTIPATH_NUM], *nbr = NULL; |
43763b11 | 751 | struct pim_rpf rpf; |
d62a17ae | 752 | int num_ifindex; |
19967127 | 753 | struct interface *ifps[MULTIPATH_NUM], *ifp; |
d62a17ae | 754 | int first_ifindex; |
755 | int found = 0; | |
756 | uint8_t i = 0; | |
757 | uint32_t hash_val = 0, mod_val = 0; | |
19967127 | 758 | uint32_t num_nbrs = 0; |
b938537b | 759 | char addr_str[PREFIX_STRLEN]; |
d62a17ae | 760 | |
5cef40fc | 761 | if (PIM_DEBUG_PIM_NHT) { |
b938537b DS |
762 | pim_inet4_dump("<addr?>", src->u.prefix4, addr_str, |
763 | sizeof(addr_str)); | |
5cef40fc DS |
764 | zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld", |
765 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name, | |
d62a17ae | 766 | nexthop->last_lookup_time); |
767 | } | |
768 | ||
43763b11 DS |
769 | memset(&rpf, 0, sizeof(struct pim_rpf)); |
770 | rpf.rpf_addr.family = AF_INET; | |
771 | rpf.rpf_addr.prefixlen = IPV4_MAX_BITLEN; | |
772 | rpf.rpf_addr.u.prefix4 = src->u.prefix4; | |
773 | ||
774 | pnc = pim_nexthop_cache_find(pim, &rpf); | |
2cb7234f DS |
775 | if (pnc) { |
776 | if (CHECK_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED)) | |
777 | return pim_ecmp_nexthop_search(pim, pnc, nexthop, src, grp, | |
778 | neighbor_needed); | |
779 | } | |
43763b11 | 780 | |
d62a17ae | 781 | memset(nexthop_tab, 0, |
782 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
b938537b DS |
783 | num_ifindex = |
784 | zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, | |
785 | src->u.prefix4, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 786 | if (num_ifindex < 1) { |
b938537b | 787 | if (PIM_DEBUG_PIM_NHT) |
209a5679 DS |
788 | zlog_warn( |
789 | "%s: could not find nexthop ifindex for address %s(%s)", | |
996c9314 | 790 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); |
cb9c7c50 | 791 | return 0; |
d62a17ae | 792 | } |
793 | ||
431f21d3 A |
794 | memset(&nbrs, 0, sizeof(nbrs)); |
795 | memset(&ifps, 0, sizeof(ifps)); | |
796 | ||
19967127 DS |
797 | /* |
798 | * Look up all interfaces and neighbors, | |
799 | * store for later usage | |
800 | */ | |
801 | for (i = 0; i < num_ifindex; i++) { | |
802 | ifps[i] = if_lookup_by_index(nexthop_tab[i].ifindex, | |
803 | pim->vrf_id); | |
804 | if (ifps[i]) { | |
805 | nbrs[i] = pim_neighbor_find( | |
806 | ifps[i], nexthop_tab[i].nexthop_addr.u.prefix4); | |
b938537b DS |
807 | if (nbrs[i] |
808 | || pim_if_connected_to_source(ifps[i], | |
809 | src->u.prefix4)) | |
19967127 DS |
810 | num_nbrs++; |
811 | } | |
812 | } | |
813 | ||
d62a17ae | 814 | // If PIM ECMP enable then choose ECMP path. |
4795fff7 | 815 | if (pim->ecmp_enable) { |
19967127 DS |
816 | uint32_t consider = num_ifindex; |
817 | ||
818 | if (neighbor_needed && num_nbrs < consider) | |
819 | consider = num_nbrs; | |
820 | ||
821 | if (consider == 0) | |
822 | return 0; | |
823 | ||
d62a17ae | 824 | hash_val = pim_compute_ecmp_hash(src, grp); |
19967127 | 825 | mod_val = hash_val % consider; |
5cef40fc | 826 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 827 | zlog_debug("%s: hash_val %u mod_val %u", |
828 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
829 | } | |
830 | ||
19967127 | 831 | i = 0; |
d62a17ae | 832 | while (!found && (i < num_ifindex)) { |
833 | first_ifindex = nexthop_tab[i].ifindex; | |
834 | ||
19967127 | 835 | ifp = ifps[i]; |
d62a17ae | 836 | if (!ifp) { |
b938537b | 837 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 838 | zlog_debug( |
5cef40fc | 839 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 840 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
841 | first_ifindex, addr_str, |
842 | pim->vrf->name); | |
d62a17ae | 843 | if (i == mod_val) |
844 | mod_val++; | |
845 | i++; | |
846 | continue; | |
847 | } | |
848 | ||
849 | if (!ifp->info) { | |
b938537b | 850 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 851 | zlog_debug( |
5cef40fc | 852 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 853 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
854 | pim->vrf->name, first_ifindex, |
855 | addr_str); | |
d62a17ae | 856 | if (i == mod_val) |
857 | mod_val++; | |
858 | i++; | |
859 | continue; | |
860 | } | |
b938537b DS |
861 | if (neighbor_needed |
862 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
19967127 | 863 | nbr = nbrs[i]; |
5cef40fc DS |
864 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
865 | zlog_debug("ifp name: %s(%s), pim nbr: %p", | |
866 | ifp->name, pim->vrf->name, nbr); | |
d62a17ae | 867 | if (!nbr && !if_is_loopback(ifp)) { |
868 | if (i == mod_val) | |
869 | mod_val++; | |
870 | i++; | |
b938537b | 871 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 872 | zlog_debug( |
5cef40fc | 873 | "%s: NBR not found on input interface %s(%s) (RPF for source %s)", |
d62a17ae | 874 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 875 | pim->vrf->name, addr_str); |
d62a17ae | 876 | continue; |
877 | } | |
878 | } | |
879 | ||
880 | if (i == mod_val) { | |
5cef40fc | 881 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 882 | char nexthop_str[PREFIX_STRLEN]; |
b938537b | 883 | |
d62a17ae | 884 | pim_addr_dump("<nexthop?>", |
885 | &nexthop_tab[i].nexthop_addr, | |
886 | nexthop_str, sizeof(nexthop_str)); | |
d62a17ae | 887 | zlog_debug( |
5cef40fc DS |
888 | "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d", |
889 | __PRETTY_FUNCTION__, nexthop_str, | |
890 | addr_str, ifp->name, pim->vrf->name, | |
d62a17ae | 891 | nexthop_tab[i].route_metric, |
892 | nexthop_tab[i].protocol_distance); | |
893 | } | |
1a81b790 | 894 | /* update nexthop data */ |
d62a17ae | 895 | nexthop->interface = ifp; |
896 | nexthop->mrib_nexthop_addr = | |
897 | nexthop_tab[i].nexthop_addr; | |
898 | nexthop->mrib_metric_preference = | |
899 | nexthop_tab[i].protocol_distance; | |
900 | nexthop->mrib_route_metric = | |
901 | nexthop_tab[i].route_metric; | |
b938537b | 902 | nexthop->last_lookup = src->u.prefix4; |
d62a17ae | 903 | nexthop->last_lookup_time = pim_time_monotonic_usec(); |
904 | nexthop->nbr = nbr; | |
905 | found = 1; | |
906 | } | |
907 | i++; | |
908 | } | |
cb9c7c50 | 909 | |
d62a17ae | 910 | if (found) |
cb9c7c50 | 911 | return 1; |
d62a17ae | 912 | else |
cb9c7c50 | 913 | return 0; |
633988a7 | 914 | } |
815c33c9 | 915 | |
25b787a2 | 916 | int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim, |
b938537b | 917 | struct prefix *src, struct prefix *grp) |
815c33c9 | 918 | { |
8a5134aa | 919 | struct pim_nexthop nhop; |
d62a17ae | 920 | int vif_index; |
8a5134aa | 921 | ifindex_t ifindex; |
b938537b | 922 | char addr_str[PREFIX_STRLEN]; |
d62a17ae | 923 | |
b938537b DS |
924 | if (PIM_DEBUG_PIM_NHT) |
925 | pim_inet4_dump("<addr?>", src->u.prefix4, addr_str, | |
926 | sizeof(addr_str)); | |
2ccc414b DS |
927 | |
928 | memset(&nhop, 0, sizeof(nhop)); | |
b938537b DS |
929 | if (!pim_ecmp_nexthop_lookup(pim, &nhop, src, grp, 0)) { |
930 | if (PIM_DEBUG_PIM_NHT) | |
d62a17ae | 931 | zlog_debug( |
5cef40fc DS |
932 | "%s: could not find nexthop ifindex for address %s(%s)", |
933 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); | |
d62a17ae | 934 | return -1; |
935 | } | |
936 | ||
8a5134aa | 937 | ifindex = nhop.interface->ifindex; |
b938537b | 938 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 939 | zlog_debug( |
5cef40fc | 940 | "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s", |
8a5134aa DS |
941 | __PRETTY_FUNCTION__, ifindex, |
942 | ifindex2ifname(ifindex, pim->vrf_id), | |
5cef40fc | 943 | pim->vrf->name, addr_str); |
d62a17ae | 944 | |
8a5134aa | 945 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); |
d62a17ae | 946 | |
947 | if (vif_index < 0) { | |
5cef40fc | 948 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 949 | zlog_debug( |
5cef40fc DS |
950 | "%s: low vif_index=%d(%s) < 1 nexthop for address %s", |
951 | __PRETTY_FUNCTION__, vif_index, pim->vrf->name, | |
d62a17ae | 952 | addr_str); |
953 | } | |
954 | return -2; | |
955 | } | |
956 | ||
957 | return vif_index; | |
815c33c9 | 958 | } |