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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)); | |
d62a17ae | 95 | pnc->rpf.rpf_addr.family = rpf_addr->rpf_addr.family; |
96 | pnc->rpf.rpf_addr.prefixlen = rpf_addr->rpf_addr.prefixlen; | |
97 | pnc->rpf.rpf_addr.u.prefix4.s_addr = | |
98 | rpf_addr->rpf_addr.u.prefix4.s_addr; | |
99 | ||
d0a4f55d | 100 | pnc = hash_get(pim->rpf_hash, pnc, hash_alloc_intern); |
d62a17ae | 101 | |
102 | pnc->rp_list = list_new(); | |
103 | pnc->rp_list->cmp = pim_rp_list_cmp; | |
104 | ||
9fb302f4 | 105 | snprintf(hash_name, 64, "PNC %s(%s) Upstream Hash", |
996c9314 | 106 | prefix2str(&pnc->rpf.rpf_addr, buf1, 64), pim->vrf->name); |
7c591950 | 107 | pnc->upstream_hash = hash_create_size(8192, pim_upstream_hash_key, |
996c9314 | 108 | pim_upstream_equal, hash_name); |
d62a17ae | 109 | |
d62a17ae | 110 | return pnc; |
1bc98276 CS |
111 | } |
112 | ||
cb9c7c50 DS |
113 | /* |
114 | * pim_find_or_track_nexthop | |
115 | * | |
116 | * This API is used to Register an address with Zebra | |
117 | * | |
118 | * 1 -> Success | |
119 | * 0 -> Failure | |
120 | */ | |
25bdac42 DS |
121 | int pim_find_or_track_nexthop(struct pim_instance *pim, struct prefix *addr, |
122 | struct pim_upstream *up, struct rp_info *rp, | |
d62a17ae | 123 | struct pim_nexthop_cache *out_pnc) |
1bc98276 | 124 | { |
d62a17ae | 125 | struct pim_nexthop_cache *pnc = NULL; |
126 | struct pim_rpf rpf; | |
127 | struct listnode *ch_node = NULL; | |
128 | struct zclient *zclient = NULL; | |
129 | ||
130 | zclient = pim_zebra_zclient_get(); | |
131 | memset(&rpf, 0, sizeof(struct pim_rpf)); | |
132 | rpf.rpf_addr.family = addr->family; | |
133 | rpf.rpf_addr.prefixlen = addr->prefixlen; | |
134 | rpf.rpf_addr.u.prefix4 = addr->u.prefix4; | |
135 | ||
25bdac42 | 136 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 137 | if (!pnc) { |
25bdac42 | 138 | pnc = pim_nexthop_cache_add(pim, &rpf); |
5cef40fc DS |
139 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
140 | ZEBRA_NEXTHOP_REGISTER); | |
141 | if (PIM_DEBUG_PIM_NHT) { | |
142 | char buf[PREFIX2STR_BUFFER]; | |
143 | prefix2str(addr, buf, sizeof(buf)); | |
144 | zlog_debug( | |
145 | "%s: NHT cache and zebra notification added for %s(%s)", | |
146 | __PRETTY_FUNCTION__, buf, pim->vrf->name); | |
147 | } | |
d62a17ae | 148 | } |
149 | ||
150 | if (rp != NULL) { | |
151 | ch_node = listnode_lookup(pnc->rp_list, rp); | |
5cef40fc | 152 | if (ch_node == NULL) |
d62a17ae | 153 | listnode_add_sort(pnc->rp_list, rp); |
d62a17ae | 154 | } |
155 | ||
7c591950 | 156 | if (up != NULL) |
c31a793b | 157 | hash_get(pnc->upstream_hash, up, hash_alloc_intern); |
d62a17ae | 158 | |
2b57b948 | 159 | if (CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) { |
d62a17ae | 160 | memcpy(out_pnc, pnc, sizeof(struct pim_nexthop_cache)); |
161 | return 1; | |
162 | } | |
163 | ||
164 | return 0; | |
1bc98276 CS |
165 | } |
166 | ||
d0a4f55d DS |
167 | void pim_delete_tracked_nexthop(struct pim_instance *pim, struct prefix *addr, |
168 | struct pim_upstream *up, struct rp_info *rp) | |
1bc98276 | 169 | { |
d62a17ae | 170 | struct pim_nexthop_cache *pnc = NULL; |
171 | struct pim_nexthop_cache lookup; | |
172 | struct zclient *zclient = NULL; | |
173 | ||
174 | zclient = pim_zebra_zclient_get(); | |
175 | ||
176 | /* Remove from RPF hash if it is the last entry */ | |
177 | lookup.rpf.rpf_addr = *addr; | |
d0a4f55d | 178 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
d62a17ae | 179 | if (pnc) { |
180 | if (rp) | |
181 | listnode_delete(pnc->rp_list, rp); | |
182 | if (up) | |
7c591950 | 183 | hash_release(pnc->upstream_hash, up); |
d62a17ae | 184 | |
5cef40fc DS |
185 | if (PIM_DEBUG_PIM_NHT) { |
186 | char buf[PREFIX_STRLEN]; | |
187 | prefix2str(addr, buf, sizeof buf); | |
d62a17ae | 188 | zlog_debug( |
7c591950 | 189 | "%s: NHT %s(%s) rp_list count:%d upstream count:%ld", |
5cef40fc | 190 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
7c591950 | 191 | pnc->rp_list->count, pnc->upstream_hash->count); |
5cef40fc | 192 | } |
d62a17ae | 193 | |
194 | if (pnc->rp_list->count == 0 | |
7c591950 | 195 | && pnc->upstream_hash->count == 0) { |
64c86530 | 196 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
d62a17ae | 197 | ZEBRA_NEXTHOP_UNREGISTER); |
198 | ||
6a154c88 | 199 | list_delete(&pnc->rp_list); |
7c591950 | 200 | hash_free(pnc->upstream_hash); |
d62a17ae | 201 | |
d0a4f55d | 202 | hash_release(pim->rpf_hash, pnc); |
d62a17ae | 203 | if (pnc->nexthop) |
204 | nexthops_free(pnc->nexthop); | |
205 | XFREE(MTYPE_PIM_NEXTHOP_CACHE, pnc); | |
206 | } | |
207 | } | |
1bc98276 CS |
208 | } |
209 | ||
210 | /* Update RP nexthop info based on Nexthop update received from Zebra.*/ | |
a7f95c76 DS |
211 | static void pim_update_rp_nh(struct pim_instance *pim, |
212 | struct pim_nexthop_cache *pnc) | |
1bc98276 | 213 | { |
d62a17ae | 214 | struct listnode *node = NULL; |
215 | struct rp_info *rp_info = NULL; | |
d62a17ae | 216 | |
217 | /*Traverse RP list and update each RP Nexthop info */ | |
218 | for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) { | |
219 | if (rp_info->rp.rpf_addr.u.prefix4.s_addr == INADDR_NONE) | |
220 | continue; | |
221 | ||
222 | // Compute PIM RPF using cached nexthop | |
996c9314 LB |
223 | pim_ecmp_nexthop_search(pim, pnc, &rp_info->rp.source_nexthop, |
224 | &rp_info->rp.rpf_addr, &rp_info->group, | |
225 | 1); | |
d62a17ae | 226 | } |
1bc98276 CS |
227 | } |
228 | ||
633988a7 CS |
229 | /* This API is used to traverse nexthop cache of RPF addr |
230 | of upstream entry whose IPv4 nexthop address is in | |
231 | unresolved state and due to event like pim neighbor | |
232 | UP event if it can be resolved. | |
233 | */ | |
25b787a2 | 234 | void pim_resolve_upstream_nh(struct pim_instance *pim, struct prefix *nht_p) |
633988a7 | 235 | { |
d62a17ae | 236 | struct nexthop *nh_node = NULL; |
237 | struct pim_nexthop_cache pnc; | |
238 | struct pim_neighbor *nbr = NULL; | |
239 | ||
240 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
25b787a2 | 241 | if (!pim_find_or_track_nexthop(pim, nht_p, NULL, NULL, &pnc)) |
cb9c7c50 DS |
242 | return; |
243 | ||
244 | for (nh_node = pnc.nexthop; nh_node; nh_node = nh_node->next) { | |
245 | if (nh_node->gate.ipv4.s_addr != 0) | |
246 | continue; | |
247 | ||
248 | struct interface *ifp1 = | |
25b787a2 | 249 | if_lookup_by_index(nh_node->ifindex, pim->vrf_id); |
cb9c7c50 DS |
250 | nbr = pim_neighbor_find_if(ifp1); |
251 | if (!nbr) | |
252 | continue; | |
253 | ||
254 | nh_node->gate.ipv4 = nbr->source_addr; | |
5cef40fc | 255 | if (PIM_DEBUG_PIM_NHT) { |
cb9c7c50 DS |
256 | char str[PREFIX_STRLEN]; |
257 | char str1[INET_ADDRSTRLEN]; | |
258 | pim_inet4_dump("<nht_nbr?>", nbr->source_addr, str1, | |
259 | sizeof(str1)); | |
260 | pim_addr_dump("<nht_addr?>", nht_p, str, sizeof(str)); | |
261 | zlog_debug( | |
262 | "%s: addr %s new nexthop addr %s interface %s", | |
263 | __PRETTY_FUNCTION__, str, str1, ifp1->name); | |
d62a17ae | 264 | } |
265 | } | |
633988a7 CS |
266 | } |
267 | ||
1bc98276 | 268 | /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/ |
e3b78da8 | 269 | static int pim_update_upstream_nh_helper(struct hash_bucket *bucket, void *arg) |
1bc98276 | 270 | { |
7c591950 | 271 | struct pim_instance *pim = (struct pim_instance *)arg; |
e3b78da8 | 272 | struct pim_upstream *up = (struct pim_upstream *)bucket->data; |
d62a17ae | 273 | int vif_index = 0; |
274 | ||
7c591950 DS |
275 | enum pim_rpf_result rpf_result; |
276 | struct pim_rpf old; | |
d62a17ae | 277 | |
7c591950 DS |
278 | old.source_nexthop.interface = up->rpf.source_nexthop.interface; |
279 | rpf_result = pim_rpf_update(pim, up, &old, 0); | |
a7f95c76 DS |
280 | if (rpf_result == PIM_RPF_FAILURE) { |
281 | pim_mroute_del(up->channel_oil, __PRETTY_FUNCTION__); | |
7c591950 | 282 | return HASHWALK_CONTINUE; |
a7f95c76 | 283 | } |
d62a17ae | 284 | |
7c591950 DS |
285 | /* update kernel multicast forwarding cache (MFC) */ |
286 | if (up->channel_oil) { | |
287 | ifindex_t ifindex = up->rpf.source_nexthop.interface->ifindex; | |
288 | ||
289 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); | |
290 | /* Pass Current selected NH vif index to mroute download | |
291 | */ | |
292 | if (vif_index) | |
293 | pim_scan_individual_oil(up->channel_oil, vif_index); | |
294 | else { | |
295 | if (PIM_DEBUG_PIM_NHT) | |
296 | zlog_debug( | |
297 | "%s: NHT upstream %s channel_oil IIF %s vif_index is not valid", | |
298 | __PRETTY_FUNCTION__, up->sg_str, | |
299 | up->rpf.source_nexthop.interface->name); | |
d62a17ae | 300 | } |
7c591950 DS |
301 | } |
302 | ||
cc67ccf9 DS |
303 | if (rpf_result == PIM_RPF_CHANGED) |
304 | pim_zebra_upstream_rpf_changed(pim, up, &old); | |
d62a17ae | 305 | |
7c591950 DS |
306 | |
307 | if (PIM_DEBUG_PIM_NHT) { | |
308 | zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s", | |
309 | __PRETTY_FUNCTION__, up->sg_str, pim->vrf->name, | |
310 | old.source_nexthop.interface->name, | |
311 | up->rpf.source_nexthop.interface->name); | |
312 | } | |
313 | ||
314 | return HASHWALK_CONTINUE; | |
315 | } | |
316 | ||
317 | static int pim_update_upstream_nh(struct pim_instance *pim, | |
318 | struct pim_nexthop_cache *pnc) | |
319 | { | |
7c591950 | 320 | hash_walk(pnc->upstream_hash, pim_update_upstream_nh_helper, pim); |
d62a17ae | 321 | |
74389231 | 322 | pim_zebra_update_all_interfaces(pim); |
d62a17ae | 323 | |
324 | return 0; | |
1bc98276 CS |
325 | } |
326 | ||
d62a17ae | 327 | uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp) |
633988a7 | 328 | { |
d62a17ae | 329 | uint32_t hash_val; |
330 | uint32_t s = 0, g = 0; | |
331 | ||
332 | if ((!src)) | |
333 | return 0; | |
334 | ||
335 | switch (src->family) { | |
336 | case AF_INET: { | |
337 | s = src->u.prefix4.s_addr; | |
338 | s = s == 0 ? 1 : s; | |
339 | if (grp) | |
340 | g = grp->u.prefix4.s_addr; | |
341 | } break; | |
342 | default: | |
343 | break; | |
344 | } | |
345 | ||
346 | hash_val = jhash_2words(g, s, 101); | |
d62a17ae | 347 | return hash_val; |
633988a7 CS |
348 | } |
349 | ||
25b787a2 DS |
350 | int pim_ecmp_nexthop_search(struct pim_instance *pim, |
351 | struct pim_nexthop_cache *pnc, | |
d62a17ae | 352 | struct pim_nexthop *nexthop, struct prefix *src, |
353 | struct prefix *grp, int neighbor_needed) | |
633988a7 | 354 | { |
c517178d | 355 | struct pim_neighbor *nbrs[MULTIPATH_NUM], *nbr = NULL; |
19967127 | 356 | struct interface *ifps[MULTIPATH_NUM]; |
d62a17ae | 357 | struct nexthop *nh_node = NULL; |
358 | ifindex_t first_ifindex; | |
359 | struct interface *ifp = NULL; | |
360 | uint32_t hash_val = 0, mod_val = 0; | |
361 | uint8_t nh_iter = 0, found = 0; | |
19967127 | 362 | uint32_t i, num_nbrs = 0; |
d62a17ae | 363 | |
364 | if (!pnc || !pnc->nexthop_num || !nexthop) | |
cb9c7c50 | 365 | return 0; |
d62a17ae | 366 | |
431f21d3 A |
367 | memset(&nbrs, 0, sizeof(nbrs)); |
368 | memset(&ifps, 0, sizeof(ifps)); | |
369 | ||
d62a17ae | 370 | // Current Nexthop is VALID, check to stay on the current path. |
371 | if (nexthop->interface && nexthop->interface->info | |
372 | && nexthop->mrib_nexthop_addr.u.prefix4.s_addr | |
373 | != PIM_NET_INADDR_ANY) { | |
374 | /* User configured knob to explicitly switch | |
375 | to new path is disabled or current path | |
376 | metric is less than nexthop update. | |
377 | */ | |
378 | ||
4795fff7 | 379 | if (pim->ecmp_rebalance_enable == 0) { |
d62a17ae | 380 | uint8_t curr_route_valid = 0; |
381 | // Check if current nexthop is present in new updated | |
382 | // Nexthop list. | |
383 | // If the current nexthop is not valid, candidate to | |
384 | // choose new Nexthop. | |
385 | for (nh_node = pnc->nexthop; nh_node; | |
1b5f8a1a | 386 | nh_node = nh_node->next) { |
d62a17ae | 387 | curr_route_valid = (nexthop->interface->ifindex |
388 | == nh_node->ifindex); | |
1b5f8a1a DS |
389 | if (curr_route_valid) |
390 | break; | |
391 | } | |
d62a17ae | 392 | |
393 | if (curr_route_valid | |
394 | && !pim_if_connected_to_source(nexthop->interface, | |
395 | src->u.prefix4)) { | |
396 | nbr = pim_neighbor_find( | |
397 | nexthop->interface, | |
398 | nexthop->mrib_nexthop_addr.u.prefix4); | |
399 | if (!nbr | |
400 | && !if_is_loopback(nexthop->interface)) { | |
5cef40fc | 401 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 402 | zlog_debug( |
403 | "%s: current nexthop does not have nbr ", | |
404 | __PRETTY_FUNCTION__); | |
405 | } else { | |
5cef40fc | 406 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 407 | char src_str[INET_ADDRSTRLEN]; |
408 | pim_inet4_dump("<addr?>", | |
409 | src->u.prefix4, | |
410 | src_str, | |
411 | sizeof(src_str)); | |
412 | char grp_str[INET_ADDRSTRLEN]; | |
413 | pim_inet4_dump("<addr?>", | |
414 | grp->u.prefix4, | |
415 | grp_str, | |
416 | sizeof(grp_str)); | |
417 | zlog_debug( | |
5cef40fc | 418 | "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection", |
d62a17ae | 419 | __PRETTY_FUNCTION__, |
420 | src_str, grp_str, | |
5cef40fc | 421 | pim->vrf->name, |
d62a17ae | 422 | nexthop->interface->name); |
423 | } | |
a7f95c76 | 424 | return 1; |
d62a17ae | 425 | } |
426 | } | |
427 | } | |
428 | } | |
19967127 DS |
429 | |
430 | /* | |
431 | * Look up all interfaces and neighbors, | |
432 | * store for later usage | |
433 | */ | |
434 | for (nh_node = pnc->nexthop, i = 0; nh_node; | |
435 | nh_node = nh_node->next, i++) { | |
436 | ifps[i] = if_lookup_by_index(nh_node->ifindex, pim->vrf_id); | |
437 | if (ifps[i]) { | |
438 | nbrs[i] = pim_neighbor_find(ifps[i], | |
439 | nh_node->gate.ipv4); | |
440 | if (nbrs[i] || pim_if_connected_to_source(ifps[i], | |
ff5d90c2 | 441 | |
19967127 DS |
442 | src->u.prefix4)) |
443 | num_nbrs++; | |
444 | } | |
445 | } | |
4795fff7 | 446 | if (pim->ecmp_enable) { |
19967127 DS |
447 | uint32_t consider = pnc->nexthop_num; |
448 | ||
449 | if (neighbor_needed && num_nbrs < consider) | |
450 | consider = num_nbrs; | |
451 | ||
452 | if (consider == 0) | |
453 | return 0; | |
454 | ||
d62a17ae | 455 | // PIM ECMP flag is enable then choose ECMP path. |
456 | hash_val = pim_compute_ecmp_hash(src, grp); | |
19967127 | 457 | mod_val = hash_val % consider; |
d62a17ae | 458 | } |
459 | ||
460 | for (nh_node = pnc->nexthop; nh_node && (found == 0); | |
461 | nh_node = nh_node->next) { | |
462 | first_ifindex = nh_node->ifindex; | |
19967127 | 463 | ifp = ifps[nh_iter]; |
d62a17ae | 464 | if (!ifp) { |
5cef40fc | 465 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 466 | char addr_str[INET_ADDRSTRLEN]; |
467 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
468 | addr_str, sizeof(addr_str)); | |
469 | zlog_debug( | |
5cef40fc | 470 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 471 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
472 | first_ifindex, addr_str, |
473 | pim->vrf->name); | |
d62a17ae | 474 | } |
475 | if (nh_iter == mod_val) | |
476 | mod_val++; // Select nexthpath | |
477 | nh_iter++; | |
478 | continue; | |
479 | } | |
480 | if (!ifp->info) { | |
5cef40fc | 481 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 482 | char addr_str[INET_ADDRSTRLEN]; |
483 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
484 | addr_str, sizeof(addr_str)); | |
485 | zlog_debug( | |
5cef40fc | 486 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 487 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
488 | pim->vrf->name, first_ifindex, |
489 | addr_str); | |
d62a17ae | 490 | } |
491 | if (nh_iter == mod_val) | |
492 | mod_val++; // Select nexthpath | |
493 | nh_iter++; | |
494 | continue; | |
495 | } | |
496 | ||
497 | if (neighbor_needed | |
498 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
19967127 | 499 | nbr = nbrs[nh_iter]; |
d62a17ae | 500 | if (!nbr && !if_is_loopback(ifp)) { |
5cef40fc | 501 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 502 | zlog_debug( |
5cef40fc DS |
503 | "%s: pim nbr not found on input interface %s(%s)", |
504 | __PRETTY_FUNCTION__, ifp->name, | |
505 | pim->vrf->name); | |
d62a17ae | 506 | if (nh_iter == mod_val) |
507 | mod_val++; // Select nexthpath | |
508 | nh_iter++; | |
509 | continue; | |
510 | } | |
511 | } | |
512 | ||
513 | if (nh_iter == mod_val) { | |
514 | nexthop->interface = ifp; | |
515 | nexthop->mrib_nexthop_addr.family = AF_INET; | |
516 | nexthop->mrib_nexthop_addr.prefixlen = IPV4_MAX_BITLEN; | |
517 | nexthop->mrib_nexthop_addr.u.prefix4 = | |
518 | nh_node->gate.ipv4; | |
519 | nexthop->mrib_metric_preference = pnc->distance; | |
520 | nexthop->mrib_route_metric = pnc->metric; | |
521 | nexthop->last_lookup = src->u.prefix4; | |
522 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
523 | nexthop->nbr = nbr; | |
524 | found = 1; | |
5cef40fc | 525 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 526 | char buf[INET_ADDRSTRLEN]; |
527 | char buf2[INET_ADDRSTRLEN]; | |
528 | char buf3[INET_ADDRSTRLEN]; | |
529 | pim_inet4_dump("<src?>", src->u.prefix4, buf2, | |
530 | sizeof(buf2)); | |
531 | pim_inet4_dump("<grp?>", grp->u.prefix4, buf3, | |
532 | sizeof(buf3)); | |
533 | pim_inet4_dump( | |
534 | "<rpf?>", | |
535 | nexthop->mrib_nexthop_addr.u.prefix4, | |
536 | buf, sizeof(buf)); | |
537 | zlog_debug( | |
5cef40fc | 538 | "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d", |
d62a17ae | 539 | __PRETTY_FUNCTION__, buf2, buf3, |
5cef40fc | 540 | pim->vrf->name, ifp->name, buf, mod_val, |
4795fff7 | 541 | nh_iter, pim->ecmp_enable); |
d62a17ae | 542 | } |
543 | } | |
544 | nh_iter++; | |
545 | } | |
546 | ||
547 | if (found) | |
cb9c7c50 | 548 | return 1; |
d62a17ae | 549 | else |
cb9c7c50 | 550 | return 0; |
633988a7 CS |
551 | } |
552 | ||
d62a17ae | 553 | /* This API is used to parse Registered address nexthop update coming from Zebra |
554 | */ | |
555 | int pim_parse_nexthop_update(int command, struct zclient *zclient, | |
556 | zebra_size_t length, vrf_id_t vrf_id) | |
1bc98276 | 557 | { |
d62a17ae | 558 | struct nexthop *nexthop; |
559 | struct nexthop *nhlist_head = NULL; | |
560 | struct nexthop *nhlist_tail = NULL; | |
d62a17ae | 561 | int i; |
562 | struct pim_rpf rpf; | |
563 | struct pim_nexthop_cache *pnc = NULL; | |
564 | struct pim_neighbor *nbr = NULL; | |
565 | struct interface *ifp = NULL; | |
566 | struct interface *ifp1 = NULL; | |
cf663ceb | 567 | struct vrf *vrf = vrf_lookup_by_id(vrf_id); |
819f099b | 568 | struct pim_instance *pim; |
4a749e2c | 569 | struct zapi_route nhr; |
819f099b DS |
570 | |
571 | if (!vrf) | |
572 | return 0; | |
573 | pim = vrf->info; | |
d62a17ae | 574 | |
7d30a959 DS |
575 | if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) { |
576 | if (PIM_DEBUG_PIM_NHT) | |
996c9314 LB |
577 | zlog_debug( |
578 | "%s: Decode of nexthop update from zebra failed", | |
579 | __PRETTY_FUNCTION__); | |
7d30a959 DS |
580 | return 0; |
581 | } | |
d62a17ae | 582 | |
583 | if (command == ZEBRA_NEXTHOP_UPDATE) { | |
4a749e2c | 584 | prefix_copy(&rpf.rpf_addr, &nhr.prefix); |
25b787a2 | 585 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 586 | if (!pnc) { |
5cef40fc | 587 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 588 | char buf[PREFIX2STR_BUFFER]; |
589 | prefix2str(&rpf.rpf_addr, buf, sizeof(buf)); | |
590 | zlog_debug( | |
591 | "%s: Skipping NHT update, addr %s is not in local cached DB.", | |
592 | __PRETTY_FUNCTION__, buf); | |
593 | } | |
594 | return 0; | |
595 | } | |
596 | } else { | |
597 | /* | |
598 | * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE | |
599 | */ | |
600 | return 0; | |
601 | } | |
602 | ||
603 | pnc->last_update = pim_time_monotonic_usec(); | |
d62a17ae | 604 | |
4a749e2c | 605 | if (nhr.nexthop_num) { |
d62a17ae | 606 | pnc->nexthop_num = 0; // Only increment for pim enabled rpf. |
607 | ||
4a749e2c DS |
608 | for (i = 0; i < nhr.nexthop_num; i++) { |
609 | nexthop = nexthop_from_zapi_nexthop(&nhr.nexthops[i]); | |
d62a17ae | 610 | switch (nexthop->type) { |
611 | case NEXTHOP_TYPE_IPV4: | |
d62a17ae | 612 | case NEXTHOP_TYPE_IPV4_IFINDEX: |
d62a17ae | 613 | case NEXTHOP_TYPE_IPV6: |
4a749e2c | 614 | case NEXTHOP_TYPE_BLACKHOLE: |
d62a17ae | 615 | break; |
66f5152f MB |
616 | case NEXTHOP_TYPE_IFINDEX: |
617 | /* | |
618 | * Connected route (i.e. no nexthop), use | |
619 | * RPF address from nexthop cache (i.e. | |
620 | * destination) as PIM nexthop. | |
621 | */ | |
56c1568b | 622 | nexthop->type = NEXTHOP_TYPE_IPV4_IFINDEX; |
66f5152f MB |
623 | nexthop->gate.ipv4 = |
624 | pnc->rpf.rpf_addr.u.prefix4; | |
625 | break; | |
d62a17ae | 626 | case NEXTHOP_TYPE_IPV6_IFINDEX: |
d62a17ae | 627 | ifp1 = if_lookup_by_index(nexthop->ifindex, |
25b787a2 | 628 | pim->vrf_id); |
d62a17ae | 629 | nbr = pim_neighbor_find_if(ifp1); |
630 | /* Overwrite with Nbr address as NH addr */ | |
5cef40fc | 631 | if (nbr) |
d62a17ae | 632 | nexthop->gate.ipv4 = nbr->source_addr; |
5cef40fc | 633 | else { |
d62a17ae | 634 | // Mark nexthop address to 0 until PIM |
635 | // Nbr is resolved. | |
636 | nexthop->gate.ipv4.s_addr = | |
637 | PIM_NET_INADDR_ANY; | |
638 | } | |
639 | ||
d62a17ae | 640 | break; |
641 | } | |
642 | ||
25b787a2 | 643 | ifp = if_lookup_by_index(nexthop->ifindex, pim->vrf_id); |
d62a17ae | 644 | if (!ifp) { |
5cef40fc | 645 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 646 | char buf[NEXTHOP_STRLEN]; |
647 | zlog_debug( | |
5cef40fc | 648 | "%s: could not find interface for ifindex %d(%s) (addr %s)", |
d62a17ae | 649 | __PRETTY_FUNCTION__, |
650 | nexthop->ifindex, | |
5cef40fc | 651 | pim->vrf->name, |
d62a17ae | 652 | nexthop2str(nexthop, buf, |
653 | sizeof(buf))); | |
654 | } | |
655 | nexthop_free(nexthop); | |
656 | continue; | |
657 | } | |
658 | ||
1b5f8a1a DS |
659 | if (PIM_DEBUG_PIM_NHT) { |
660 | char p_str[PREFIX2STR_BUFFER]; | |
4a749e2c DS |
661 | |
662 | prefix2str(&nhr.prefix, p_str, sizeof(p_str)); | |
1b5f8a1a DS |
663 | zlog_debug( |
664 | "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ", | |
665 | __PRETTY_FUNCTION__, p_str, | |
666 | pim->vrf->name, i + 1, | |
667 | inet_ntoa(nexthop->gate.ipv4), | |
4a749e2c DS |
668 | ifp->name, nexthop->type, nhr.distance, |
669 | nhr.metric); | |
1b5f8a1a DS |
670 | } |
671 | ||
d62a17ae | 672 | if (!ifp->info) { |
5cef40fc | 673 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 674 | char buf[NEXTHOP_STRLEN]; |
4a749e2c | 675 | |
d62a17ae | 676 | zlog_debug( |
5cef40fc | 677 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)", |
d62a17ae | 678 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 679 | pim->vrf->name, |
d62a17ae | 680 | nexthop->ifindex, |
681 | nexthop2str(nexthop, buf, | |
682 | sizeof(buf))); | |
683 | } | |
684 | nexthop_free(nexthop); | |
685 | continue; | |
686 | } | |
687 | ||
688 | if (nhlist_tail) { | |
689 | nhlist_tail->next = nexthop; | |
690 | nhlist_tail = nexthop; | |
691 | } else { | |
692 | nhlist_tail = nexthop; | |
693 | nhlist_head = nexthop; | |
694 | } | |
695 | // Only keep track of nexthops which are PIM enabled. | |
696 | pnc->nexthop_num++; | |
697 | } | |
698 | /* Reset existing pnc->nexthop before assigning new list */ | |
699 | nexthops_free(pnc->nexthop); | |
700 | pnc->nexthop = nhlist_head; | |
701 | if (pnc->nexthop_num) { | |
702 | pnc->flags |= PIM_NEXTHOP_VALID; | |
4a749e2c DS |
703 | pnc->distance = nhr.distance; |
704 | pnc->metric = nhr.metric; | |
d62a17ae | 705 | } |
706 | } else { | |
707 | pnc->flags &= ~PIM_NEXTHOP_VALID; | |
4a749e2c | 708 | pnc->nexthop_num = nhr.nexthop_num; |
d62a17ae | 709 | nexthops_free(pnc->nexthop); |
710 | pnc->nexthop = NULL; | |
711 | } | |
712 | ||
5cef40fc | 713 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 714 | char buf[PREFIX2STR_BUFFER]; |
4a749e2c | 715 | prefix2str(&nhr.prefix, buf, sizeof(buf)); |
d62a17ae | 716 | zlog_debug( |
87ad28f4 | 717 | "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d", |
4a749e2c DS |
718 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
719 | nhr.nexthop_num, pnc->nexthop_num, vrf_id, | |
996c9314 | 720 | pnc->upstream_hash->count, listcount(pnc->rp_list)); |
d62a17ae | 721 | } |
722 | ||
bfc92019 | 723 | pim_rpf_set_refresh_time(pim); |
d62a17ae | 724 | |
725 | if (listcount(pnc->rp_list)) | |
25b787a2 | 726 | pim_update_rp_nh(pim, pnc); |
7c591950 | 727 | if (pnc->upstream_hash->count) |
cf663ceb | 728 | pim_update_upstream_nh(pim, pnc); |
d62a17ae | 729 | |
730 | return 0; | |
1bc98276 | 731 | } |
633988a7 | 732 | |
25b787a2 | 733 | int pim_ecmp_nexthop_lookup(struct pim_instance *pim, |
b938537b DS |
734 | struct pim_nexthop *nexthop, struct prefix *src, |
735 | struct prefix *grp, int neighbor_needed) | |
633988a7 | 736 | { |
d62a17ae | 737 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
19967127 | 738 | struct pim_neighbor *nbrs[MULTIPATH_NUM], *nbr = NULL; |
d62a17ae | 739 | int num_ifindex; |
19967127 | 740 | struct interface *ifps[MULTIPATH_NUM], *ifp; |
d62a17ae | 741 | int first_ifindex; |
742 | int found = 0; | |
743 | uint8_t i = 0; | |
744 | uint32_t hash_val = 0, mod_val = 0; | |
19967127 | 745 | uint32_t num_nbrs = 0; |
b938537b | 746 | char addr_str[PREFIX_STRLEN]; |
d62a17ae | 747 | |
5cef40fc | 748 | if (PIM_DEBUG_PIM_NHT) { |
b938537b DS |
749 | pim_inet4_dump("<addr?>", src->u.prefix4, addr_str, |
750 | sizeof(addr_str)); | |
5cef40fc DS |
751 | zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld", |
752 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name, | |
d62a17ae | 753 | nexthop->last_lookup_time); |
754 | } | |
755 | ||
756 | memset(nexthop_tab, 0, | |
757 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
b938537b DS |
758 | num_ifindex = |
759 | zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, | |
760 | src->u.prefix4, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 761 | if (num_ifindex < 1) { |
b938537b | 762 | if (PIM_DEBUG_PIM_NHT) |
209a5679 DS |
763 | zlog_warn( |
764 | "%s: could not find nexthop ifindex for address %s(%s)", | |
996c9314 | 765 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); |
cb9c7c50 | 766 | return 0; |
d62a17ae | 767 | } |
768 | ||
431f21d3 A |
769 | memset(&nbrs, 0, sizeof(nbrs)); |
770 | memset(&ifps, 0, sizeof(ifps)); | |
771 | ||
19967127 DS |
772 | /* |
773 | * Look up all interfaces and neighbors, | |
774 | * store for later usage | |
775 | */ | |
776 | for (i = 0; i < num_ifindex; i++) { | |
777 | ifps[i] = if_lookup_by_index(nexthop_tab[i].ifindex, | |
778 | pim->vrf_id); | |
779 | if (ifps[i]) { | |
780 | nbrs[i] = pim_neighbor_find( | |
781 | ifps[i], nexthop_tab[i].nexthop_addr.u.prefix4); | |
b938537b DS |
782 | if (nbrs[i] |
783 | || pim_if_connected_to_source(ifps[i], | |
784 | src->u.prefix4)) | |
19967127 DS |
785 | num_nbrs++; |
786 | } | |
787 | } | |
788 | ||
d62a17ae | 789 | // If PIM ECMP enable then choose ECMP path. |
4795fff7 | 790 | if (pim->ecmp_enable) { |
19967127 DS |
791 | uint32_t consider = num_ifindex; |
792 | ||
793 | if (neighbor_needed && num_nbrs < consider) | |
794 | consider = num_nbrs; | |
795 | ||
796 | if (consider == 0) | |
797 | return 0; | |
798 | ||
d62a17ae | 799 | hash_val = pim_compute_ecmp_hash(src, grp); |
19967127 | 800 | mod_val = hash_val % consider; |
5cef40fc | 801 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 802 | zlog_debug("%s: hash_val %u mod_val %u", |
803 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
804 | } | |
805 | ||
19967127 | 806 | i = 0; |
d62a17ae | 807 | while (!found && (i < num_ifindex)) { |
808 | first_ifindex = nexthop_tab[i].ifindex; | |
809 | ||
19967127 | 810 | ifp = ifps[i]; |
d62a17ae | 811 | if (!ifp) { |
b938537b | 812 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 813 | zlog_debug( |
5cef40fc | 814 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 815 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
816 | first_ifindex, addr_str, |
817 | pim->vrf->name); | |
d62a17ae | 818 | if (i == mod_val) |
819 | mod_val++; | |
820 | i++; | |
821 | continue; | |
822 | } | |
823 | ||
824 | if (!ifp->info) { | |
b938537b | 825 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 826 | zlog_debug( |
5cef40fc | 827 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 828 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
829 | pim->vrf->name, first_ifindex, |
830 | addr_str); | |
d62a17ae | 831 | if (i == mod_val) |
832 | mod_val++; | |
833 | i++; | |
834 | continue; | |
835 | } | |
b938537b DS |
836 | if (neighbor_needed |
837 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
19967127 | 838 | nbr = nbrs[i]; |
5cef40fc DS |
839 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
840 | zlog_debug("ifp name: %s(%s), pim nbr: %p", | |
841 | ifp->name, pim->vrf->name, nbr); | |
d62a17ae | 842 | if (!nbr && !if_is_loopback(ifp)) { |
843 | if (i == mod_val) | |
844 | mod_val++; | |
845 | i++; | |
b938537b | 846 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 847 | zlog_debug( |
5cef40fc | 848 | "%s: NBR not found on input interface %s(%s) (RPF for source %s)", |
d62a17ae | 849 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 850 | pim->vrf->name, addr_str); |
d62a17ae | 851 | continue; |
852 | } | |
853 | } | |
854 | ||
855 | if (i == mod_val) { | |
5cef40fc | 856 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 857 | char nexthop_str[PREFIX_STRLEN]; |
b938537b | 858 | |
d62a17ae | 859 | pim_addr_dump("<nexthop?>", |
860 | &nexthop_tab[i].nexthop_addr, | |
861 | nexthop_str, sizeof(nexthop_str)); | |
d62a17ae | 862 | zlog_debug( |
5cef40fc DS |
863 | "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d", |
864 | __PRETTY_FUNCTION__, nexthop_str, | |
865 | addr_str, ifp->name, pim->vrf->name, | |
d62a17ae | 866 | nexthop_tab[i].route_metric, |
867 | nexthop_tab[i].protocol_distance); | |
868 | } | |
1a81b790 | 869 | /* update nexthop data */ |
d62a17ae | 870 | nexthop->interface = ifp; |
871 | nexthop->mrib_nexthop_addr = | |
872 | nexthop_tab[i].nexthop_addr; | |
873 | nexthop->mrib_metric_preference = | |
874 | nexthop_tab[i].protocol_distance; | |
875 | nexthop->mrib_route_metric = | |
876 | nexthop_tab[i].route_metric; | |
b938537b | 877 | nexthop->last_lookup = src->u.prefix4; |
d62a17ae | 878 | nexthop->last_lookup_time = pim_time_monotonic_usec(); |
879 | nexthop->nbr = nbr; | |
880 | found = 1; | |
881 | } | |
882 | i++; | |
883 | } | |
cb9c7c50 | 884 | |
d62a17ae | 885 | if (found) |
cb9c7c50 | 886 | return 1; |
d62a17ae | 887 | else |
cb9c7c50 | 888 | return 0; |
633988a7 | 889 | } |
815c33c9 | 890 | |
25b787a2 | 891 | int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim, |
b938537b | 892 | struct prefix *src, struct prefix *grp) |
815c33c9 | 893 | { |
8a5134aa | 894 | struct pim_nexthop nhop; |
d62a17ae | 895 | int vif_index; |
8a5134aa | 896 | ifindex_t ifindex; |
b938537b | 897 | char addr_str[PREFIX_STRLEN]; |
d62a17ae | 898 | |
b938537b DS |
899 | if (PIM_DEBUG_PIM_NHT) |
900 | pim_inet4_dump("<addr?>", src->u.prefix4, addr_str, | |
901 | sizeof(addr_str)); | |
902 | if (!pim_ecmp_nexthop_lookup(pim, &nhop, src, grp, 0)) { | |
903 | if (PIM_DEBUG_PIM_NHT) | |
d62a17ae | 904 | zlog_debug( |
5cef40fc DS |
905 | "%s: could not find nexthop ifindex for address %s(%s)", |
906 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); | |
d62a17ae | 907 | return -1; |
908 | } | |
909 | ||
8a5134aa | 910 | ifindex = nhop.interface->ifindex; |
b938537b | 911 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 912 | zlog_debug( |
5cef40fc | 913 | "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s", |
8a5134aa DS |
914 | __PRETTY_FUNCTION__, ifindex, |
915 | ifindex2ifname(ifindex, pim->vrf_id), | |
5cef40fc | 916 | pim->vrf->name, addr_str); |
d62a17ae | 917 | |
8a5134aa | 918 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); |
d62a17ae | 919 | |
920 | if (vif_index < 0) { | |
5cef40fc | 921 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 922 | zlog_debug( |
5cef40fc DS |
923 | "%s: low vif_index=%d(%s) < 1 nexthop for address %s", |
924 | __PRETTY_FUNCTION__, vif_index, pim->vrf->name, | |
d62a17ae | 925 | addr_str); |
926 | } | |
927 | return -2; | |
928 | } | |
929 | ||
930 | return vif_index; | |
815c33c9 | 931 | } |