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1bc98276 CS |
1 | /* |
2 | * PIM for Quagga | |
3 | * Copyright (C) 2017 Cumulus Networks, Inc. | |
4 | * Chirag Shah | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
896014f4 DL |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1bc98276 CS |
19 | */ |
20 | #include <zebra.h> | |
21 | #include "network.h" | |
22 | #include "zclient.h" | |
23 | #include "stream.h" | |
24 | #include "nexthop.h" | |
25 | #include "if.h" | |
26 | #include "hash.h" | |
27 | #include "jhash.h" | |
28 | ||
29 | #include "pimd.h" | |
30 | #include "pimd/pim_nht.h" | |
31 | #include "log.h" | |
32 | #include "pim_time.h" | |
33 | #include "pim_oil.h" | |
34 | #include "pim_ifchannel.h" | |
35 | #include "pim_mroute.h" | |
36 | #include "pim_zebra.h" | |
37 | #include "pim_upstream.h" | |
38 | #include "pim_join.h" | |
39 | #include "pim_jp_agg.h" | |
40 | #include "pim_zebra.h" | |
633988a7 | 41 | #include "pim_zlookup.h" |
1bc98276 CS |
42 | |
43 | /** | |
44 | * pim_sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister | |
45 | * command to Zebra. | |
46 | */ | |
64c86530 | 47 | void pim_sendmsg_zebra_rnh(struct pim_instance *pim, struct zclient *zclient, |
d62a17ae | 48 | struct pim_nexthop_cache *pnc, int command) |
1bc98276 | 49 | { |
d62a17ae | 50 | struct prefix *p; |
51 | int ret; | |
52 | ||
d62a17ae | 53 | p = &(pnc->rpf.rpf_addr); |
3c192540 | 54 | ret = zclient_send_rnh(zclient, command, p, false, pim->vrf_id); |
d62a17ae | 55 | if (ret < 0) |
56 | zlog_warn("sendmsg_nexthop: zclient_send_message() failed"); | |
57 | ||
5cef40fc | 58 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 59 | char buf[PREFIX2STR_BUFFER]; |
60 | prefix2str(p, buf, sizeof(buf)); | |
5cef40fc DS |
61 | zlog_debug( |
62 | "%s: NHT %sregistered addr %s(%s) with Zebra ret:%d ", | |
63 | __PRETTY_FUNCTION__, | |
64 | (command == ZEBRA_NEXTHOP_REGISTER) ? " " : "de", buf, | |
65 | pim->vrf->name, ret); | |
d62a17ae | 66 | } |
67 | ||
68 | return; | |
1bc98276 CS |
69 | } |
70 | ||
d0a4f55d DS |
71 | struct pim_nexthop_cache *pim_nexthop_cache_find(struct pim_instance *pim, |
72 | struct pim_rpf *rpf) | |
1bc98276 | 73 | { |
d62a17ae | 74 | struct pim_nexthop_cache *pnc = NULL; |
75 | struct pim_nexthop_cache lookup; | |
1bc98276 | 76 | |
d62a17ae | 77 | lookup.rpf.rpf_addr.family = rpf->rpf_addr.family; |
78 | lookup.rpf.rpf_addr.prefixlen = rpf->rpf_addr.prefixlen; | |
79 | lookup.rpf.rpf_addr.u.prefix4.s_addr = rpf->rpf_addr.u.prefix4.s_addr; | |
1bc98276 | 80 | |
d0a4f55d | 81 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
1bc98276 | 82 | |
d62a17ae | 83 | return pnc; |
1bc98276 CS |
84 | } |
85 | ||
5cef40fc DS |
86 | static struct pim_nexthop_cache *pim_nexthop_cache_add(struct pim_instance *pim, |
87 | struct pim_rpf *rpf_addr) | |
1bc98276 | 88 | { |
d62a17ae | 89 | struct pim_nexthop_cache *pnc; |
9fb302f4 DS |
90 | char hash_name[64]; |
91 | char buf1[64]; | |
d62a17ae | 92 | |
93 | pnc = XCALLOC(MTYPE_PIM_NEXTHOP_CACHE, | |
94 | sizeof(struct pim_nexthop_cache)); | |
95 | if (!pnc) { | |
96 | zlog_err("%s: NHT PIM XCALLOC failure ", __PRETTY_FUNCTION__); | |
97 | return NULL; | |
98 | } | |
99 | pnc->rpf.rpf_addr.family = rpf_addr->rpf_addr.family; | |
100 | pnc->rpf.rpf_addr.prefixlen = rpf_addr->rpf_addr.prefixlen; | |
101 | pnc->rpf.rpf_addr.u.prefix4.s_addr = | |
102 | rpf_addr->rpf_addr.u.prefix4.s_addr; | |
103 | ||
d0a4f55d | 104 | pnc = hash_get(pim->rpf_hash, pnc, hash_alloc_intern); |
d62a17ae | 105 | |
106 | pnc->rp_list = list_new(); | |
107 | pnc->rp_list->cmp = pim_rp_list_cmp; | |
108 | ||
9fb302f4 DS |
109 | snprintf(hash_name, 64, "PNC %s(%s) Upstream Hash", |
110 | prefix2str(&pnc->rpf.rpf_addr, buf1, 64), | |
111 | pim->vrf->name); | |
7c591950 DS |
112 | pnc->upstream_hash = hash_create_size(8192, pim_upstream_hash_key, |
113 | pim_upstream_equal, | |
9fb302f4 | 114 | hash_name); |
d62a17ae | 115 | |
d62a17ae | 116 | return pnc; |
1bc98276 CS |
117 | } |
118 | ||
cb9c7c50 DS |
119 | /* |
120 | * pim_find_or_track_nexthop | |
121 | * | |
122 | * This API is used to Register an address with Zebra | |
123 | * | |
124 | * 1 -> Success | |
125 | * 0 -> Failure | |
126 | */ | |
25bdac42 DS |
127 | int pim_find_or_track_nexthop(struct pim_instance *pim, struct prefix *addr, |
128 | struct pim_upstream *up, struct rp_info *rp, | |
d62a17ae | 129 | struct pim_nexthop_cache *out_pnc) |
1bc98276 | 130 | { |
d62a17ae | 131 | struct pim_nexthop_cache *pnc = NULL; |
132 | struct pim_rpf rpf; | |
133 | struct listnode *ch_node = NULL; | |
134 | struct zclient *zclient = NULL; | |
135 | ||
136 | zclient = pim_zebra_zclient_get(); | |
137 | memset(&rpf, 0, sizeof(struct pim_rpf)); | |
138 | rpf.rpf_addr.family = addr->family; | |
139 | rpf.rpf_addr.prefixlen = addr->prefixlen; | |
140 | rpf.rpf_addr.u.prefix4 = addr->u.prefix4; | |
141 | ||
25bdac42 | 142 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 143 | if (!pnc) { |
25bdac42 | 144 | pnc = pim_nexthop_cache_add(pim, &rpf); |
5cef40fc | 145 | if (!pnc) { |
d62a17ae | 146 | char rpf_str[PREFIX_STRLEN]; |
147 | pim_addr_dump("<nht-pnc?>", addr, rpf_str, | |
148 | sizeof(rpf_str)); | |
149 | zlog_warn("%s: pnc node allocation failed. addr %s ", | |
150 | __PRETTY_FUNCTION__, rpf_str); | |
cb9c7c50 | 151 | return 0; |
d62a17ae | 152 | } |
5cef40fc DS |
153 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
154 | ZEBRA_NEXTHOP_REGISTER); | |
155 | if (PIM_DEBUG_PIM_NHT) { | |
156 | char buf[PREFIX2STR_BUFFER]; | |
157 | prefix2str(addr, buf, sizeof(buf)); | |
158 | zlog_debug( | |
159 | "%s: NHT cache and zebra notification added for %s(%s)", | |
160 | __PRETTY_FUNCTION__, buf, pim->vrf->name); | |
161 | } | |
d62a17ae | 162 | } |
163 | ||
164 | if (rp != NULL) { | |
165 | ch_node = listnode_lookup(pnc->rp_list, rp); | |
5cef40fc | 166 | if (ch_node == NULL) |
d62a17ae | 167 | listnode_add_sort(pnc->rp_list, rp); |
d62a17ae | 168 | } |
169 | ||
7c591950 | 170 | if (up != NULL) |
c31a793b | 171 | hash_get(pnc->upstream_hash, up, hash_alloc_intern); |
d62a17ae | 172 | |
173 | if (pnc && CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) { | |
174 | memcpy(out_pnc, pnc, sizeof(struct pim_nexthop_cache)); | |
175 | return 1; | |
176 | } | |
177 | ||
178 | return 0; | |
1bc98276 CS |
179 | } |
180 | ||
d0a4f55d DS |
181 | void pim_delete_tracked_nexthop(struct pim_instance *pim, struct prefix *addr, |
182 | struct pim_upstream *up, struct rp_info *rp) | |
1bc98276 | 183 | { |
d62a17ae | 184 | struct pim_nexthop_cache *pnc = NULL; |
185 | struct pim_nexthop_cache lookup; | |
186 | struct zclient *zclient = NULL; | |
187 | ||
188 | zclient = pim_zebra_zclient_get(); | |
189 | ||
190 | /* Remove from RPF hash if it is the last entry */ | |
191 | lookup.rpf.rpf_addr = *addr; | |
d0a4f55d | 192 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
d62a17ae | 193 | if (pnc) { |
194 | if (rp) | |
195 | listnode_delete(pnc->rp_list, rp); | |
196 | if (up) | |
7c591950 | 197 | hash_release(pnc->upstream_hash, up); |
d62a17ae | 198 | |
5cef40fc DS |
199 | if (PIM_DEBUG_PIM_NHT) { |
200 | char buf[PREFIX_STRLEN]; | |
201 | prefix2str(addr, buf, sizeof buf); | |
d62a17ae | 202 | zlog_debug( |
7c591950 | 203 | "%s: NHT %s(%s) rp_list count:%d upstream count:%ld", |
5cef40fc | 204 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
7c591950 | 205 | pnc->rp_list->count, pnc->upstream_hash->count); |
5cef40fc | 206 | } |
d62a17ae | 207 | |
208 | if (pnc->rp_list->count == 0 | |
7c591950 | 209 | && pnc->upstream_hash->count == 0) { |
64c86530 | 210 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
d62a17ae | 211 | ZEBRA_NEXTHOP_UNREGISTER); |
212 | ||
affe9e99 | 213 | list_delete_and_null(&pnc->rp_list); |
7c591950 | 214 | hash_free(pnc->upstream_hash); |
d62a17ae | 215 | |
d0a4f55d | 216 | hash_release(pim->rpf_hash, pnc); |
d62a17ae | 217 | if (pnc->nexthop) |
218 | nexthops_free(pnc->nexthop); | |
219 | XFREE(MTYPE_PIM_NEXTHOP_CACHE, pnc); | |
220 | } | |
221 | } | |
1bc98276 CS |
222 | } |
223 | ||
224 | /* Update RP nexthop info based on Nexthop update received from Zebra.*/ | |
a7f95c76 DS |
225 | static void pim_update_rp_nh(struct pim_instance *pim, |
226 | struct pim_nexthop_cache *pnc) | |
1bc98276 | 227 | { |
d62a17ae | 228 | struct listnode *node = NULL; |
229 | struct rp_info *rp_info = NULL; | |
d62a17ae | 230 | |
231 | /*Traverse RP list and update each RP Nexthop info */ | |
232 | for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) { | |
233 | if (rp_info->rp.rpf_addr.u.prefix4.s_addr == INADDR_NONE) | |
234 | continue; | |
235 | ||
236 | // Compute PIM RPF using cached nexthop | |
a7f95c76 DS |
237 | pim_ecmp_nexthop_search(pim, pnc, |
238 | &rp_info->rp.source_nexthop, | |
239 | &rp_info->rp.rpf_addr, | |
240 | &rp_info->group, 1); | |
d62a17ae | 241 | } |
1bc98276 CS |
242 | } |
243 | ||
633988a7 CS |
244 | /* This API is used to traverse nexthop cache of RPF addr |
245 | of upstream entry whose IPv4 nexthop address is in | |
246 | unresolved state and due to event like pim neighbor | |
247 | UP event if it can be resolved. | |
248 | */ | |
25b787a2 | 249 | void pim_resolve_upstream_nh(struct pim_instance *pim, struct prefix *nht_p) |
633988a7 | 250 | { |
d62a17ae | 251 | struct nexthop *nh_node = NULL; |
252 | struct pim_nexthop_cache pnc; | |
253 | struct pim_neighbor *nbr = NULL; | |
254 | ||
255 | memset(&pnc, 0, sizeof(struct pim_nexthop_cache)); | |
25b787a2 | 256 | if (!pim_find_or_track_nexthop(pim, nht_p, NULL, NULL, &pnc)) |
cb9c7c50 DS |
257 | return; |
258 | ||
259 | for (nh_node = pnc.nexthop; nh_node; nh_node = nh_node->next) { | |
260 | if (nh_node->gate.ipv4.s_addr != 0) | |
261 | continue; | |
262 | ||
263 | struct interface *ifp1 = | |
25b787a2 | 264 | if_lookup_by_index(nh_node->ifindex, pim->vrf_id); |
cb9c7c50 DS |
265 | nbr = pim_neighbor_find_if(ifp1); |
266 | if (!nbr) | |
267 | continue; | |
268 | ||
269 | nh_node->gate.ipv4 = nbr->source_addr; | |
5cef40fc | 270 | if (PIM_DEBUG_PIM_NHT) { |
cb9c7c50 DS |
271 | char str[PREFIX_STRLEN]; |
272 | char str1[INET_ADDRSTRLEN]; | |
273 | pim_inet4_dump("<nht_nbr?>", nbr->source_addr, str1, | |
274 | sizeof(str1)); | |
275 | pim_addr_dump("<nht_addr?>", nht_p, str, sizeof(str)); | |
276 | zlog_debug( | |
277 | "%s: addr %s new nexthop addr %s interface %s", | |
278 | __PRETTY_FUNCTION__, str, str1, ifp1->name); | |
d62a17ae | 279 | } |
280 | } | |
633988a7 CS |
281 | } |
282 | ||
1bc98276 | 283 | /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/ |
7c591950 | 284 | static int pim_update_upstream_nh_helper(struct hash_backet *backet, void *arg) |
1bc98276 | 285 | { |
7c591950 DS |
286 | struct pim_instance *pim = (struct pim_instance *)arg; |
287 | struct pim_upstream *up = (struct pim_upstream *)backet->data; | |
d62a17ae | 288 | int vif_index = 0; |
289 | ||
7c591950 DS |
290 | enum pim_rpf_result rpf_result; |
291 | struct pim_rpf old; | |
d62a17ae | 292 | |
7c591950 DS |
293 | old.source_nexthop.interface = up->rpf.source_nexthop.interface; |
294 | rpf_result = pim_rpf_update(pim, up, &old, 0); | |
a7f95c76 DS |
295 | if (rpf_result == PIM_RPF_FAILURE) { |
296 | pim_mroute_del(up->channel_oil, __PRETTY_FUNCTION__); | |
7c591950 | 297 | return HASHWALK_CONTINUE; |
a7f95c76 | 298 | } |
d62a17ae | 299 | |
7c591950 DS |
300 | /* update kernel multicast forwarding cache (MFC) */ |
301 | if (up->channel_oil) { | |
302 | ifindex_t ifindex = up->rpf.source_nexthop.interface->ifindex; | |
303 | ||
304 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); | |
305 | /* Pass Current selected NH vif index to mroute download | |
306 | */ | |
307 | if (vif_index) | |
308 | pim_scan_individual_oil(up->channel_oil, vif_index); | |
309 | else { | |
310 | if (PIM_DEBUG_PIM_NHT) | |
311 | zlog_debug( | |
312 | "%s: NHT upstream %s channel_oil IIF %s vif_index is not valid", | |
313 | __PRETTY_FUNCTION__, up->sg_str, | |
314 | up->rpf.source_nexthop.interface->name); | |
d62a17ae | 315 | } |
7c591950 DS |
316 | } |
317 | ||
318 | if (rpf_result == PIM_RPF_CHANGED) { | |
319 | struct pim_neighbor *nbr; | |
d62a17ae | 320 | |
7c591950 DS |
321 | nbr = pim_neighbor_find(old.source_nexthop.interface, |
322 | old.rpf_addr.u.prefix4); | |
323 | if (nbr) | |
324 | pim_jp_agg_remove_group(nbr->upstream_jp_agg, up); | |
d62a17ae | 325 | |
7c591950 DS |
326 | /* |
327 | * We have detected a case where we might need to rescan | |
328 | * the inherited o_list so do it. | |
329 | */ | |
330 | if (up->channel_oil | |
331 | && up->channel_oil->oil_inherited_rescan) { | |
332 | pim_upstream_inherited_olist_decide(pim, up); | |
333 | up->channel_oil->oil_inherited_rescan = 0; | |
334 | } | |
d62a17ae | 335 | |
7c591950 | 336 | if (up->join_state == PIM_UPSTREAM_JOINED) { |
d62a17ae | 337 | /* |
7c591950 DS |
338 | * If we come up real fast we can be here |
339 | * where the mroute has not been installed | |
340 | * so install it. | |
d62a17ae | 341 | */ |
342 | if (up->channel_oil | |
7c591950 DS |
343 | && !up->channel_oil->installed) |
344 | pim_mroute_add(up->channel_oil, | |
345 | __PRETTY_FUNCTION__); | |
d62a17ae | 346 | |
7c591950 DS |
347 | /* |
348 | * RFC 4601: 4.5.7. Sending (S,G) Join/Prune Messages | |
349 | * | |
350 | * Transitions from Joined State | |
351 | * | |
352 | * RPF'(S,G) changes not due to an Assert | |
353 | * | |
354 | * The upstream (S,G) state machine remains in Joined | |
355 | * state. Send Join(S,G) to the new upstream | |
356 | * neighbor, which is the new value of RPF'(S,G). | |
357 | * Send Prune(S,G) to the old upstream neighbor, which | |
358 | * is the old value of RPF'(S,G). Set the Join | |
359 | * Timer (JT) to expire after t_periodic seconds. | |
360 | */ | |
361 | pim_jp_agg_switch_interface(&old, &up->rpf, up); | |
d62a17ae | 362 | |
7c591950 DS |
363 | pim_upstream_join_timer_restart(up, &old); |
364 | } /* up->join_state == PIM_UPSTREAM_JOINED */ | |
365 | ||
366 | /* | |
367 | * FIXME can join_desired actually be changed by | |
368 | * pim_rpf_update() returning PIM_RPF_CHANGED ? | |
369 | */ | |
370 | pim_upstream_update_join_desired(pim, up); | |
371 | ||
372 | } /* PIM_RPF_CHANGED */ | |
373 | ||
374 | if (PIM_DEBUG_PIM_NHT) { | |
375 | zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s", | |
376 | __PRETTY_FUNCTION__, up->sg_str, pim->vrf->name, | |
377 | old.source_nexthop.interface->name, | |
378 | up->rpf.source_nexthop.interface->name); | |
379 | } | |
380 | ||
381 | return HASHWALK_CONTINUE; | |
382 | } | |
383 | ||
384 | static int pim_update_upstream_nh(struct pim_instance *pim, | |
385 | struct pim_nexthop_cache *pnc) | |
386 | { | |
f4e14fdb | 387 | struct listnode *node; |
7c591950 DS |
388 | struct interface *ifp; |
389 | ||
390 | hash_walk(pnc->upstream_hash, pim_update_upstream_nh_helper, pim); | |
d62a17ae | 391 | |
451fda4f | 392 | FOR_ALL_INTERFACES (pim->vrf, ifp) |
d62a17ae | 393 | if (ifp->info) { |
394 | struct pim_interface *pim_ifp = ifp->info; | |
395 | struct pim_iface_upstream_switch *us; | |
396 | ||
397 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->upstream_switch_list, | |
398 | node, us)) { | |
399 | struct pim_rpf rpf; | |
400 | rpf.source_nexthop.interface = ifp; | |
401 | rpf.rpf_addr.u.prefix4 = us->address; | |
402 | pim_joinprune_send(&rpf, us->us); | |
403 | pim_jp_agg_clear_group(us->us); | |
404 | } | |
405 | } | |
406 | ||
407 | return 0; | |
1bc98276 CS |
408 | } |
409 | ||
d62a17ae | 410 | uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp) |
633988a7 | 411 | { |
d62a17ae | 412 | uint32_t hash_val; |
413 | uint32_t s = 0, g = 0; | |
414 | ||
415 | if ((!src)) | |
416 | return 0; | |
417 | ||
418 | switch (src->family) { | |
419 | case AF_INET: { | |
420 | s = src->u.prefix4.s_addr; | |
421 | s = s == 0 ? 1 : s; | |
422 | if (grp) | |
423 | g = grp->u.prefix4.s_addr; | |
424 | } break; | |
425 | default: | |
426 | break; | |
427 | } | |
428 | ||
429 | hash_val = jhash_2words(g, s, 101); | |
d62a17ae | 430 | return hash_val; |
633988a7 CS |
431 | } |
432 | ||
25b787a2 DS |
433 | int pim_ecmp_nexthop_search(struct pim_instance *pim, |
434 | struct pim_nexthop_cache *pnc, | |
d62a17ae | 435 | struct pim_nexthop *nexthop, struct prefix *src, |
436 | struct prefix *grp, int neighbor_needed) | |
633988a7 | 437 | { |
d62a17ae | 438 | struct pim_neighbor *nbr = NULL; |
439 | struct nexthop *nh_node = NULL; | |
440 | ifindex_t first_ifindex; | |
441 | struct interface *ifp = NULL; | |
442 | uint32_t hash_val = 0, mod_val = 0; | |
443 | uint8_t nh_iter = 0, found = 0; | |
444 | ||
445 | if (!pnc || !pnc->nexthop_num || !nexthop) | |
cb9c7c50 | 446 | return 0; |
d62a17ae | 447 | |
448 | // Current Nexthop is VALID, check to stay on the current path. | |
449 | if (nexthop->interface && nexthop->interface->info | |
450 | && nexthop->mrib_nexthop_addr.u.prefix4.s_addr | |
451 | != PIM_NET_INADDR_ANY) { | |
452 | /* User configured knob to explicitly switch | |
453 | to new path is disabled or current path | |
454 | metric is less than nexthop update. | |
455 | */ | |
456 | ||
457 | if (qpim_ecmp_rebalance_enable == 0) { | |
458 | uint8_t curr_route_valid = 0; | |
459 | // Check if current nexthop is present in new updated | |
460 | // Nexthop list. | |
461 | // If the current nexthop is not valid, candidate to | |
462 | // choose new Nexthop. | |
463 | for (nh_node = pnc->nexthop; nh_node; | |
1b5f8a1a | 464 | nh_node = nh_node->next) { |
d62a17ae | 465 | curr_route_valid = (nexthop->interface->ifindex |
466 | == nh_node->ifindex); | |
1b5f8a1a DS |
467 | if (curr_route_valid) |
468 | break; | |
469 | } | |
d62a17ae | 470 | |
471 | if (curr_route_valid | |
472 | && !pim_if_connected_to_source(nexthop->interface, | |
473 | src->u.prefix4)) { | |
474 | nbr = pim_neighbor_find( | |
475 | nexthop->interface, | |
476 | nexthop->mrib_nexthop_addr.u.prefix4); | |
477 | if (!nbr | |
478 | && !if_is_loopback(nexthop->interface)) { | |
5cef40fc | 479 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 480 | zlog_debug( |
481 | "%s: current nexthop does not have nbr ", | |
482 | __PRETTY_FUNCTION__); | |
483 | } else { | |
5cef40fc | 484 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 485 | char src_str[INET_ADDRSTRLEN]; |
486 | pim_inet4_dump("<addr?>", | |
487 | src->u.prefix4, | |
488 | src_str, | |
489 | sizeof(src_str)); | |
490 | char grp_str[INET_ADDRSTRLEN]; | |
491 | pim_inet4_dump("<addr?>", | |
492 | grp->u.prefix4, | |
493 | grp_str, | |
494 | sizeof(grp_str)); | |
495 | zlog_debug( | |
5cef40fc | 496 | "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection", |
d62a17ae | 497 | __PRETTY_FUNCTION__, |
498 | src_str, grp_str, | |
5cef40fc | 499 | pim->vrf->name, |
d62a17ae | 500 | nexthop->interface->name); |
501 | } | |
a7f95c76 | 502 | return 1; |
d62a17ae | 503 | } |
504 | } | |
505 | } | |
506 | } | |
507 | if (qpim_ecmp_enable) { | |
508 | // PIM ECMP flag is enable then choose ECMP path. | |
509 | hash_val = pim_compute_ecmp_hash(src, grp); | |
510 | mod_val = hash_val % pnc->nexthop_num; | |
d62a17ae | 511 | } |
512 | ||
513 | for (nh_node = pnc->nexthop; nh_node && (found == 0); | |
514 | nh_node = nh_node->next) { | |
515 | first_ifindex = nh_node->ifindex; | |
25b787a2 | 516 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); |
d62a17ae | 517 | if (!ifp) { |
5cef40fc | 518 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 519 | char addr_str[INET_ADDRSTRLEN]; |
520 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
521 | addr_str, sizeof(addr_str)); | |
522 | zlog_debug( | |
5cef40fc | 523 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 524 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
525 | first_ifindex, addr_str, |
526 | pim->vrf->name); | |
d62a17ae | 527 | } |
528 | if (nh_iter == mod_val) | |
529 | mod_val++; // Select nexthpath | |
530 | nh_iter++; | |
531 | continue; | |
532 | } | |
533 | if (!ifp->info) { | |
5cef40fc | 534 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 535 | char addr_str[INET_ADDRSTRLEN]; |
536 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
537 | addr_str, sizeof(addr_str)); | |
538 | zlog_debug( | |
5cef40fc | 539 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 540 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
541 | pim->vrf->name, first_ifindex, |
542 | addr_str); | |
d62a17ae | 543 | } |
544 | if (nh_iter == mod_val) | |
545 | mod_val++; // Select nexthpath | |
546 | nh_iter++; | |
547 | continue; | |
548 | } | |
549 | ||
550 | if (neighbor_needed | |
551 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
552 | nbr = pim_neighbor_find(ifp, nh_node->gate.ipv4); | |
d62a17ae | 553 | if (!nbr && !if_is_loopback(ifp)) { |
5cef40fc | 554 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 555 | zlog_debug( |
5cef40fc DS |
556 | "%s: pim nbr not found on input interface %s(%s)", |
557 | __PRETTY_FUNCTION__, ifp->name, | |
558 | pim->vrf->name); | |
d62a17ae | 559 | if (nh_iter == mod_val) |
560 | mod_val++; // Select nexthpath | |
561 | nh_iter++; | |
562 | continue; | |
563 | } | |
564 | } | |
565 | ||
566 | if (nh_iter == mod_val) { | |
567 | nexthop->interface = ifp; | |
568 | nexthop->mrib_nexthop_addr.family = AF_INET; | |
569 | nexthop->mrib_nexthop_addr.prefixlen = IPV4_MAX_BITLEN; | |
570 | nexthop->mrib_nexthop_addr.u.prefix4 = | |
571 | nh_node->gate.ipv4; | |
572 | nexthop->mrib_metric_preference = pnc->distance; | |
573 | nexthop->mrib_route_metric = pnc->metric; | |
574 | nexthop->last_lookup = src->u.prefix4; | |
575 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
576 | nexthop->nbr = nbr; | |
577 | found = 1; | |
5cef40fc | 578 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 579 | char buf[INET_ADDRSTRLEN]; |
580 | char buf2[INET_ADDRSTRLEN]; | |
581 | char buf3[INET_ADDRSTRLEN]; | |
582 | pim_inet4_dump("<src?>", src->u.prefix4, buf2, | |
583 | sizeof(buf2)); | |
584 | pim_inet4_dump("<grp?>", grp->u.prefix4, buf3, | |
585 | sizeof(buf3)); | |
586 | pim_inet4_dump( | |
587 | "<rpf?>", | |
588 | nexthop->mrib_nexthop_addr.u.prefix4, | |
589 | buf, sizeof(buf)); | |
590 | zlog_debug( | |
5cef40fc | 591 | "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d", |
d62a17ae | 592 | __PRETTY_FUNCTION__, buf2, buf3, |
5cef40fc DS |
593 | pim->vrf->name, ifp->name, buf, mod_val, |
594 | nh_iter, qpim_ecmp_enable); | |
d62a17ae | 595 | } |
596 | } | |
597 | nh_iter++; | |
598 | } | |
599 | ||
600 | if (found) | |
cb9c7c50 | 601 | return 1; |
d62a17ae | 602 | else |
cb9c7c50 | 603 | return 0; |
633988a7 CS |
604 | } |
605 | ||
d62a17ae | 606 | /* This API is used to parse Registered address nexthop update coming from Zebra |
607 | */ | |
608 | int pim_parse_nexthop_update(int command, struct zclient *zclient, | |
609 | zebra_size_t length, vrf_id_t vrf_id) | |
1bc98276 | 610 | { |
d62a17ae | 611 | struct stream *s; |
612 | struct prefix p; | |
613 | struct nexthop *nexthop; | |
614 | struct nexthop *nhlist_head = NULL; | |
615 | struct nexthop *nhlist_tail = NULL; | |
616 | uint32_t metric, distance; | |
617 | u_char nexthop_num = 0; | |
618 | int i; | |
619 | struct pim_rpf rpf; | |
620 | struct pim_nexthop_cache *pnc = NULL; | |
621 | struct pim_neighbor *nbr = NULL; | |
622 | struct interface *ifp = NULL; | |
623 | struct interface *ifp1 = NULL; | |
cf663ceb | 624 | struct vrf *vrf = vrf_lookup_by_id(vrf_id); |
819f099b DS |
625 | struct pim_instance *pim; |
626 | ||
627 | if (!vrf) | |
628 | return 0; | |
629 | pim = vrf->info; | |
d62a17ae | 630 | |
631 | s = zclient->ibuf; | |
632 | memset(&p, 0, sizeof(struct prefix)); | |
633 | p.family = stream_getw(s); | |
634 | p.prefixlen = stream_getc(s); | |
635 | switch (p.family) { | |
636 | case AF_INET: | |
637 | p.u.prefix4.s_addr = stream_get_ipv4(s); | |
638 | break; | |
639 | case AF_INET6: | |
640 | stream_get(&p.u.prefix6, s, 16); | |
641 | break; | |
642 | default: | |
643 | break; | |
644 | } | |
645 | ||
646 | if (command == ZEBRA_NEXTHOP_UPDATE) { | |
647 | rpf.rpf_addr.family = p.family; | |
648 | rpf.rpf_addr.prefixlen = p.prefixlen; | |
649 | rpf.rpf_addr.u.prefix4.s_addr = p.u.prefix4.s_addr; | |
25b787a2 | 650 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 651 | if (!pnc) { |
5cef40fc | 652 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 653 | char buf[PREFIX2STR_BUFFER]; |
654 | prefix2str(&rpf.rpf_addr, buf, sizeof(buf)); | |
655 | zlog_debug( | |
656 | "%s: Skipping NHT update, addr %s is not in local cached DB.", | |
657 | __PRETTY_FUNCTION__, buf); | |
658 | } | |
659 | return 0; | |
660 | } | |
661 | } else { | |
662 | /* | |
663 | * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE | |
664 | */ | |
665 | return 0; | |
666 | } | |
667 | ||
668 | pnc->last_update = pim_time_monotonic_usec(); | |
669 | distance = stream_getc(s); | |
670 | metric = stream_getl(s); | |
671 | nexthop_num = stream_getc(s); | |
672 | ||
673 | if (nexthop_num) { | |
674 | pnc->nexthop_num = 0; // Only increment for pim enabled rpf. | |
675 | ||
676 | for (i = 0; i < nexthop_num; i++) { | |
677 | nexthop = nexthop_new(); | |
678 | nexthop->type = stream_getc(s); | |
679 | switch (nexthop->type) { | |
680 | case NEXTHOP_TYPE_IPV4: | |
681 | nexthop->gate.ipv4.s_addr = stream_get_ipv4(s); | |
682 | nexthop->ifindex = stream_getl(s); | |
683 | break; | |
684 | case NEXTHOP_TYPE_IFINDEX: | |
685 | nexthop->ifindex = stream_getl(s); | |
686 | break; | |
687 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
688 | nexthop->gate.ipv4.s_addr = stream_get_ipv4(s); | |
689 | nexthop->ifindex = stream_getl(s); | |
690 | break; | |
691 | case NEXTHOP_TYPE_IPV6: | |
692 | stream_get(&nexthop->gate.ipv6, s, 16); | |
693 | break; | |
694 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
695 | stream_get(&nexthop->gate.ipv6, s, 16); | |
696 | nexthop->ifindex = stream_getl(s); | |
697 | ifp1 = if_lookup_by_index(nexthop->ifindex, | |
25b787a2 | 698 | pim->vrf_id); |
d62a17ae | 699 | nbr = pim_neighbor_find_if(ifp1); |
700 | /* Overwrite with Nbr address as NH addr */ | |
5cef40fc | 701 | if (nbr) |
d62a17ae | 702 | nexthop->gate.ipv4 = nbr->source_addr; |
5cef40fc | 703 | else { |
d62a17ae | 704 | // Mark nexthop address to 0 until PIM |
705 | // Nbr is resolved. | |
706 | nexthop->gate.ipv4.s_addr = | |
707 | PIM_NET_INADDR_ANY; | |
708 | } | |
709 | ||
710 | break; | |
711 | default: | |
712 | /* do nothing */ | |
713 | break; | |
714 | } | |
715 | ||
25b787a2 | 716 | ifp = if_lookup_by_index(nexthop->ifindex, pim->vrf_id); |
d62a17ae | 717 | if (!ifp) { |
5cef40fc | 718 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 719 | char buf[NEXTHOP_STRLEN]; |
720 | zlog_debug( | |
5cef40fc | 721 | "%s: could not find interface for ifindex %d(%s) (addr %s)", |
d62a17ae | 722 | __PRETTY_FUNCTION__, |
723 | nexthop->ifindex, | |
5cef40fc | 724 | pim->vrf->name, |
d62a17ae | 725 | nexthop2str(nexthop, buf, |
726 | sizeof(buf))); | |
727 | } | |
728 | nexthop_free(nexthop); | |
729 | continue; | |
730 | } | |
731 | ||
1b5f8a1a DS |
732 | if (PIM_DEBUG_PIM_NHT) { |
733 | char p_str[PREFIX2STR_BUFFER]; | |
734 | prefix2str(&p, p_str, sizeof(p_str)); | |
735 | zlog_debug( | |
736 | "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ", | |
737 | __PRETTY_FUNCTION__, p_str, | |
738 | pim->vrf->name, i + 1, | |
739 | inet_ntoa(nexthop->gate.ipv4), | |
740 | ifp->name, nexthop->type, distance, | |
741 | metric); | |
742 | } | |
743 | ||
d62a17ae | 744 | if (!ifp->info) { |
5cef40fc | 745 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 746 | char buf[NEXTHOP_STRLEN]; |
747 | zlog_debug( | |
5cef40fc | 748 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)", |
d62a17ae | 749 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 750 | pim->vrf->name, |
d62a17ae | 751 | nexthop->ifindex, |
752 | nexthop2str(nexthop, buf, | |
753 | sizeof(buf))); | |
754 | } | |
755 | nexthop_free(nexthop); | |
756 | continue; | |
757 | } | |
758 | ||
759 | if (nhlist_tail) { | |
760 | nhlist_tail->next = nexthop; | |
761 | nhlist_tail = nexthop; | |
762 | } else { | |
763 | nhlist_tail = nexthop; | |
764 | nhlist_head = nexthop; | |
765 | } | |
766 | // Only keep track of nexthops which are PIM enabled. | |
767 | pnc->nexthop_num++; | |
768 | } | |
769 | /* Reset existing pnc->nexthop before assigning new list */ | |
770 | nexthops_free(pnc->nexthop); | |
771 | pnc->nexthop = nhlist_head; | |
772 | if (pnc->nexthop_num) { | |
773 | pnc->flags |= PIM_NEXTHOP_VALID; | |
774 | pnc->distance = distance; | |
775 | pnc->metric = metric; | |
776 | } | |
777 | } else { | |
778 | pnc->flags &= ~PIM_NEXTHOP_VALID; | |
779 | pnc->nexthop_num = nexthop_num; | |
780 | nexthops_free(pnc->nexthop); | |
781 | pnc->nexthop = NULL; | |
782 | } | |
783 | ||
5cef40fc | 784 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 785 | char buf[PREFIX2STR_BUFFER]; |
786 | prefix2str(&p, buf, sizeof(buf)); | |
787 | zlog_debug( | |
87ad28f4 | 788 | "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d", |
5cef40fc | 789 | __PRETTY_FUNCTION__, buf, pim->vrf->name, nexthop_num, |
7c591950 | 790 | pnc->nexthop_num, vrf_id, pnc->upstream_hash->count, |
d62a17ae | 791 | listcount(pnc->rp_list)); |
792 | } | |
793 | ||
794 | pim_rpf_set_refresh_time(); | |
795 | ||
796 | if (listcount(pnc->rp_list)) | |
25b787a2 | 797 | pim_update_rp_nh(pim, pnc); |
7c591950 | 798 | if (pnc->upstream_hash->count) |
cf663ceb | 799 | pim_update_upstream_nh(pim, pnc); |
d62a17ae | 800 | |
801 | return 0; | |
1bc98276 | 802 | } |
633988a7 | 803 | |
25b787a2 DS |
804 | int pim_ecmp_nexthop_lookup(struct pim_instance *pim, |
805 | struct pim_nexthop *nexthop, struct in_addr addr, | |
d62a17ae | 806 | struct prefix *src, struct prefix *grp, |
807 | int neighbor_needed) | |
633988a7 | 808 | { |
d62a17ae | 809 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
810 | struct pim_neighbor *nbr = NULL; | |
811 | int num_ifindex; | |
812 | struct interface *ifp; | |
813 | int first_ifindex; | |
814 | int found = 0; | |
815 | uint8_t i = 0; | |
816 | uint32_t hash_val = 0, mod_val = 0; | |
817 | ||
5cef40fc | 818 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 819 | char addr_str[INET_ADDRSTRLEN]; |
820 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
5cef40fc DS |
821 | zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld", |
822 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name, | |
d62a17ae | 823 | nexthop->last_lookup_time); |
824 | } | |
825 | ||
826 | memset(nexthop_tab, 0, | |
827 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
71edad0f DS |
828 | num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, |
829 | addr, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 830 | if (num_ifindex < 1) { |
209a5679 DS |
831 | if (PIM_DEBUG_PIM_NHT) { |
832 | char addr_str[INET_ADDRSTRLEN]; | |
833 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
834 | zlog_warn( | |
835 | "%s: could not find nexthop ifindex for address %s(%s)", | |
836 | __PRETTY_FUNCTION__, addr_str, | |
837 | pim->vrf->name); | |
838 | } | |
cb9c7c50 | 839 | return 0; |
d62a17ae | 840 | } |
841 | ||
842 | // If PIM ECMP enable then choose ECMP path. | |
843 | if (qpim_ecmp_enable) { | |
844 | hash_val = pim_compute_ecmp_hash(src, grp); | |
845 | mod_val = hash_val % num_ifindex; | |
5cef40fc | 846 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 847 | zlog_debug("%s: hash_val %u mod_val %u", |
848 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
849 | } | |
850 | ||
851 | while (!found && (i < num_ifindex)) { | |
852 | first_ifindex = nexthop_tab[i].ifindex; | |
853 | ||
25b787a2 | 854 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); |
d62a17ae | 855 | if (!ifp) { |
5cef40fc | 856 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 857 | char addr_str[INET_ADDRSTRLEN]; |
858 | pim_inet4_dump("<addr?>", addr, addr_str, | |
859 | sizeof(addr_str)); | |
860 | zlog_debug( | |
5cef40fc | 861 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 862 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
863 | first_ifindex, addr_str, |
864 | pim->vrf->name); | |
d62a17ae | 865 | } |
866 | if (i == mod_val) | |
867 | mod_val++; | |
868 | i++; | |
869 | continue; | |
870 | } | |
871 | ||
872 | if (!ifp->info) { | |
5cef40fc | 873 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 874 | char addr_str[INET_ADDRSTRLEN]; |
875 | pim_inet4_dump("<addr?>", addr, addr_str, | |
876 | sizeof(addr_str)); | |
877 | zlog_debug( | |
5cef40fc | 878 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 879 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
880 | pim->vrf->name, first_ifindex, |
881 | addr_str); | |
d62a17ae | 882 | } |
883 | if (i == mod_val) | |
884 | mod_val++; | |
885 | i++; | |
886 | continue; | |
887 | } | |
888 | if (neighbor_needed && !pim_if_connected_to_source(ifp, addr)) { | |
889 | nbr = pim_neighbor_find( | |
890 | ifp, nexthop_tab[i].nexthop_addr.u.prefix4); | |
5cef40fc DS |
891 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
892 | zlog_debug("ifp name: %s(%s), pim nbr: %p", | |
893 | ifp->name, pim->vrf->name, nbr); | |
d62a17ae | 894 | if (!nbr && !if_is_loopback(ifp)) { |
895 | if (i == mod_val) | |
896 | mod_val++; | |
897 | i++; | |
5cef40fc | 898 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 899 | char addr_str[INET_ADDRSTRLEN]; |
900 | pim_inet4_dump("<addr?>", addr, | |
901 | addr_str, | |
902 | sizeof(addr_str)); | |
903 | zlog_debug( | |
5cef40fc | 904 | "%s: NBR not found on input interface %s(%s) (RPF for source %s)", |
d62a17ae | 905 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 906 | pim->vrf->name, addr_str); |
d62a17ae | 907 | } |
908 | continue; | |
909 | } | |
910 | } | |
911 | ||
912 | if (i == mod_val) { | |
5cef40fc | 913 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 914 | char nexthop_str[PREFIX_STRLEN]; |
915 | char addr_str[INET_ADDRSTRLEN]; | |
916 | pim_addr_dump("<nexthop?>", | |
917 | &nexthop_tab[i].nexthop_addr, | |
918 | nexthop_str, sizeof(nexthop_str)); | |
919 | pim_inet4_dump("<addr?>", addr, addr_str, | |
920 | sizeof(addr_str)); | |
921 | zlog_debug( | |
5cef40fc DS |
922 | "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d", |
923 | __PRETTY_FUNCTION__, nexthop_str, | |
924 | addr_str, ifp->name, pim->vrf->name, | |
d62a17ae | 925 | nexthop_tab[i].route_metric, |
926 | nexthop_tab[i].protocol_distance); | |
927 | } | |
928 | /* update nextop data */ | |
929 | nexthop->interface = ifp; | |
930 | nexthop->mrib_nexthop_addr = | |
931 | nexthop_tab[i].nexthop_addr; | |
932 | nexthop->mrib_metric_preference = | |
933 | nexthop_tab[i].protocol_distance; | |
934 | nexthop->mrib_route_metric = | |
935 | nexthop_tab[i].route_metric; | |
936 | nexthop->last_lookup = addr; | |
937 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
938 | nexthop->nbr = nbr; | |
939 | found = 1; | |
940 | } | |
941 | i++; | |
942 | } | |
cb9c7c50 | 943 | |
d62a17ae | 944 | if (found) |
cb9c7c50 | 945 | return 1; |
d62a17ae | 946 | else |
cb9c7c50 | 947 | return 0; |
633988a7 | 948 | } |
815c33c9 | 949 | |
25b787a2 DS |
950 | int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim, |
951 | struct in_addr addr, struct prefix *src, | |
d62a17ae | 952 | struct prefix *grp) |
815c33c9 | 953 | { |
d62a17ae | 954 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
955 | int num_ifindex; | |
956 | int vif_index; | |
957 | ifindex_t first_ifindex; | |
958 | uint32_t hash_val = 0, mod_val = 0; | |
959 | ||
960 | memset(nexthop_tab, 0, | |
961 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
71edad0f DS |
962 | num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, |
963 | addr, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 964 | if (num_ifindex < 1) { |
5cef40fc | 965 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 966 | char addr_str[INET_ADDRSTRLEN]; |
967 | pim_inet4_dump("<addr?>", addr, addr_str, | |
968 | sizeof(addr_str)); | |
969 | zlog_debug( | |
5cef40fc DS |
970 | "%s: could not find nexthop ifindex for address %s(%s)", |
971 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); | |
d62a17ae | 972 | } |
973 | return -1; | |
974 | } | |
975 | ||
976 | // If PIM ECMP enable then choose ECMP path. | |
977 | if (qpim_ecmp_enable) { | |
978 | hash_val = pim_compute_ecmp_hash(src, grp); | |
979 | mod_val = hash_val % num_ifindex; | |
5cef40fc | 980 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 981 | zlog_debug("%s: hash_val %u mod_val %u", |
982 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
983 | } | |
984 | ||
985 | first_ifindex = nexthop_tab[mod_val].ifindex; | |
986 | ||
5cef40fc | 987 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 988 | char addr_str[INET_ADDRSTRLEN]; |
989 | pim_inet4_dump("<ifaddr?>", addr, addr_str, sizeof(addr_str)); | |
990 | zlog_debug( | |
5cef40fc DS |
991 | "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s", |
992 | __PRETTY_FUNCTION__, first_ifindex, | |
993 | ifindex2ifname(first_ifindex, pim->vrf_id), | |
994 | pim->vrf->name, addr_str); | |
d62a17ae | 995 | } |
996 | ||
7cfc7bcf | 997 | vif_index = pim_if_find_vifindex_by_ifindex(pim, first_ifindex); |
d62a17ae | 998 | |
999 | if (vif_index < 0) { | |
5cef40fc | 1000 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 1001 | char addr_str[INET_ADDRSTRLEN]; |
1002 | pim_inet4_dump("<addr?>", addr, addr_str, | |
1003 | sizeof(addr_str)); | |
1004 | zlog_debug( | |
5cef40fc DS |
1005 | "%s: low vif_index=%d(%s) < 1 nexthop for address %s", |
1006 | __PRETTY_FUNCTION__, vif_index, pim->vrf->name, | |
d62a17ae | 1007 | addr_str); |
1008 | } | |
1009 | return -2; | |
1010 | } | |
1011 | ||
1012 | return vif_index; | |
815c33c9 | 1013 | } |