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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 | 180 | struct pim_upstream *upstream = NULL; |
d62a17ae | 181 | |
182 | zclient = pim_zebra_zclient_get(); | |
183 | ||
184 | /* Remove from RPF hash if it is the last entry */ | |
185 | lookup.rpf.rpf_addr = *addr; | |
d0a4f55d | 186 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
d62a17ae | 187 | if (pnc) { |
246445a3 SP |
188 | if (rp) { |
189 | /* Release the (*, G)upstream from pnc->upstream_hash, | |
190 | * whose Group belongs to the RP getting deleted | |
191 | */ | |
dd3364cb DS |
192 | frr_each (rb_pim_upstream, &pim->upstream_head, |
193 | upstream) { | |
246445a3 SP |
194 | struct prefix grp; |
195 | struct rp_info *trp_info; | |
196 | ||
197 | if (upstream->sg.src.s_addr != INADDR_ANY) | |
198 | continue; | |
199 | ||
200 | grp.family = AF_INET; | |
201 | grp.prefixlen = IPV4_MAX_BITLEN; | |
202 | grp.u.prefix4 = upstream->sg.grp; | |
203 | ||
204 | trp_info = pim_rp_find_match_group(pim, &grp); | |
205 | if (trp_info == rp) | |
206 | hash_release(pnc->upstream_hash, | |
207 | upstream); | |
208 | } | |
d62a17ae | 209 | listnode_delete(pnc->rp_list, rp); |
246445a3 SP |
210 | } |
211 | ||
d62a17ae | 212 | if (up) |
7c591950 | 213 | hash_release(pnc->upstream_hash, up); |
d62a17ae | 214 | |
4533b847 | 215 | if (del_bsr_tracking) |
216 | pnc->bsr_tracking = false; | |
217 | ||
5cef40fc DS |
218 | if (PIM_DEBUG_PIM_NHT) { |
219 | char buf[PREFIX_STRLEN]; | |
220 | prefix2str(addr, buf, sizeof buf); | |
d62a17ae | 221 | zlog_debug( |
7c591950 | 222 | "%s: NHT %s(%s) rp_list count:%d upstream count:%ld", |
5cef40fc | 223 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
7c591950 | 224 | pnc->rp_list->count, pnc->upstream_hash->count); |
5cef40fc | 225 | } |
d62a17ae | 226 | |
227 | if (pnc->rp_list->count == 0 | |
4533b847 | 228 | && pnc->upstream_hash->count == 0 |
229 | && pnc->bsr_tracking == false) { | |
64c86530 | 230 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
d62a17ae | 231 | ZEBRA_NEXTHOP_UNREGISTER); |
232 | ||
6a154c88 | 233 | list_delete(&pnc->rp_list); |
7c591950 | 234 | hash_free(pnc->upstream_hash); |
d62a17ae | 235 | |
d0a4f55d | 236 | hash_release(pim->rpf_hash, pnc); |
d62a17ae | 237 | if (pnc->nexthop) |
238 | nexthops_free(pnc->nexthop); | |
239 | XFREE(MTYPE_PIM_NEXTHOP_CACHE, pnc); | |
240 | } | |
241 | } | |
1bc98276 CS |
242 | } |
243 | ||
4b936634 | 244 | /* Given a source address and a neighbor address, check if the neighbor is one |
245 | * of the next hop to reach the source. search from zebra route database | |
246 | */ | |
247 | bool pim_nexthop_match(struct pim_instance *pim, struct in_addr addr, | |
248 | struct in_addr ip_src) | |
249 | { | |
250 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; | |
251 | int i = 0; | |
252 | ifindex_t first_ifindex = 0; | |
253 | struct interface *ifp = NULL; | |
254 | struct pim_neighbor *nbr = NULL; | |
255 | int num_ifindex; | |
256 | ||
257 | if (addr.s_addr == INADDR_NONE) | |
258 | return 0; | |
259 | ||
260 | memset(nexthop_tab, 0, | |
261 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
262 | num_ifindex = zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, | |
263 | addr, PIM_NEXTHOP_LOOKUP_MAX); | |
264 | if (num_ifindex < 1) { | |
265 | char addr_str[INET_ADDRSTRLEN]; | |
266 | ||
267 | pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str)); | |
268 | zlog_warn( | |
269 | "%s %s: could not find nexthop ifindex for address %s", | |
270 | __FILE__, __PRETTY_FUNCTION__, addr_str); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | while (i < num_ifindex) { | |
275 | first_ifindex = nexthop_tab[i].ifindex; | |
276 | ||
277 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); | |
278 | if (!ifp) { | |
279 | if (PIM_DEBUG_ZEBRA) { | |
280 | char addr_str[INET_ADDRSTRLEN]; | |
281 | ||
282 | pim_inet4_dump("<addr?>", addr, addr_str, | |
283 | sizeof(addr_str)); | |
284 | zlog_debug( | |
285 | "%s %s: could not find interface for ifindex %d (address %s)", | |
286 | __FILE__, __PRETTY_FUNCTION__, | |
287 | first_ifindex, addr_str); | |
288 | } | |
289 | i++; | |
290 | continue; | |
291 | } | |
292 | ||
293 | if (!ifp->info) { | |
294 | if (PIM_DEBUG_ZEBRA) { | |
295 | char addr_str[INET_ADDRSTRLEN]; | |
296 | ||
297 | pim_inet4_dump("<addr?>", addr, addr_str, | |
298 | sizeof(addr_str)); | |
299 | zlog_debug( | |
300 | "%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)", | |
301 | __PRETTY_FUNCTION__, ifp->name, | |
302 | first_ifindex, addr_str); | |
303 | } | |
304 | i++; | |
305 | continue; | |
306 | } | |
307 | ||
308 | if (!pim_if_connected_to_source(ifp, addr)) { | |
309 | nbr = pim_neighbor_find( | |
310 | ifp, nexthop_tab[i].nexthop_addr.u.prefix4); | |
311 | if (PIM_DEBUG_PIM_TRACE_DETAIL) | |
312 | zlog_debug("ifp name: %s, pim nbr: %p", | |
313 | ifp->name, nbr); | |
314 | if (!nbr && !if_is_loopback(ifp)) { | |
315 | i++; | |
316 | continue; | |
317 | } | |
318 | } | |
319 | ||
320 | if (nexthop_tab[i].nexthop_addr.u.prefix4.s_addr | |
321 | == ip_src.s_addr) | |
322 | return 1; | |
323 | ||
324 | i++; | |
325 | } | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | /* Given a source address and a neighbor address, check if the neighbor is one | |
331 | * of the next hop to reach the source. search from pim next hop cache | |
332 | */ | |
333 | bool pim_nexthop_match_nht_cache(struct pim_instance *pim, struct in_addr addr, | |
334 | struct in_addr ip_src) | |
335 | { | |
336 | struct pim_rpf rpf; | |
337 | ifindex_t first_ifindex; | |
338 | struct interface *ifp = NULL; | |
339 | uint8_t nh_iter = 0; | |
340 | struct pim_neighbor *nbr = NULL; | |
341 | struct nexthop *nh_node = NULL; | |
342 | struct pim_nexthop_cache *pnc = NULL; | |
343 | ||
344 | memset(&rpf, 0, sizeof(struct pim_rpf)); | |
345 | rpf.rpf_addr.family = AF_INET; | |
346 | rpf.rpf_addr.prefixlen = IPV4_MAX_BITLEN; | |
347 | rpf.rpf_addr.u.prefix4 = addr; | |
348 | ||
349 | pnc = pim_nexthop_cache_find(pim, &rpf); | |
350 | if (!pnc || !pnc->nexthop_num) | |
351 | return 0; | |
352 | ||
353 | for (nh_node = pnc->nexthop; nh_node; nh_node = nh_node->next) { | |
354 | first_ifindex = nh_node->ifindex; | |
355 | ifp = if_lookup_by_index(first_ifindex, pim->vrf_id); | |
356 | if (!ifp) { | |
357 | if (PIM_DEBUG_PIM_NHT) { | |
358 | char addr_str[INET_ADDRSTRLEN]; | |
359 | ||
360 | pim_inet4_dump("<addr?>", addr, addr_str, | |
361 | sizeof(addr_str)); | |
362 | zlog_debug( | |
363 | "%s %s: could not find interface for ifindex %d (address %s(%s))", | |
364 | __FILE__, __PRETTY_FUNCTION__, | |
365 | first_ifindex, addr_str, | |
366 | pim->vrf->name); | |
367 | } | |
368 | nh_iter++; | |
369 | continue; | |
370 | } | |
371 | if (!ifp->info) { | |
372 | if (PIM_DEBUG_PIM_NHT) { | |
373 | char addr_str[INET_ADDRSTRLEN]; | |
374 | ||
375 | pim_inet4_dump("<addr?>", addr, addr_str, | |
376 | sizeof(addr_str)); | |
377 | zlog_debug( | |
378 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", | |
379 | __PRETTY_FUNCTION__, ifp->name, | |
380 | pim->vrf->name, first_ifindex, | |
381 | addr_str); | |
382 | } | |
383 | nh_iter++; | |
384 | continue; | |
385 | } | |
386 | ||
387 | if (!pim_if_connected_to_source(ifp, addr)) { | |
388 | nbr = pim_neighbor_find(ifp, nh_node->gate.ipv4); | |
389 | if (!nbr && !if_is_loopback(ifp)) { | |
390 | if (PIM_DEBUG_PIM_NHT) | |
391 | zlog_debug( | |
392 | "%s: pim nbr not found on input interface %s(%s)", | |
393 | __PRETTY_FUNCTION__, ifp->name, | |
394 | pim->vrf->name); | |
395 | nh_iter++; | |
396 | continue; | |
397 | } | |
398 | } | |
399 | ||
400 | if (nh_node->gate.ipv4.s_addr == ip_src.s_addr) | |
401 | return 1; | |
402 | } | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
640b8d93 SP |
407 | void pim_rp_nexthop_del(struct rp_info *rp_info) |
408 | { | |
409 | rp_info->rp.source_nexthop.interface = NULL; | |
410 | rp_info->rp.source_nexthop.mrib_nexthop_addr.u.prefix4.s_addr = | |
411 | PIM_NET_INADDR_ANY; | |
412 | rp_info->rp.source_nexthop.mrib_metric_preference = | |
413 | router->infinite_assert_metric.metric_preference; | |
414 | rp_info->rp.source_nexthop.mrib_route_metric = | |
415 | router->infinite_assert_metric.route_metric; | |
416 | } | |
417 | ||
1bc98276 | 418 | /* Update RP nexthop info based on Nexthop update received from Zebra.*/ |
a7f95c76 DS |
419 | static void pim_update_rp_nh(struct pim_instance *pim, |
420 | struct pim_nexthop_cache *pnc) | |
1bc98276 | 421 | { |
d62a17ae | 422 | struct listnode *node = NULL; |
423 | struct rp_info *rp_info = NULL; | |
d62a17ae | 424 | |
425 | /*Traverse RP list and update each RP Nexthop info */ | |
426 | for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) { | |
427 | if (rp_info->rp.rpf_addr.u.prefix4.s_addr == INADDR_NONE) | |
428 | continue; | |
429 | ||
430 | // Compute PIM RPF using cached nexthop | |
43763b11 DS |
431 | if (!pim_ecmp_nexthop_lookup(pim, &rp_info->rp.source_nexthop, |
432 | &rp_info->rp.rpf_addr, | |
433 | &rp_info->group, 1)) | |
640b8d93 | 434 | pim_rp_nexthop_del(rp_info); |
d62a17ae | 435 | } |
1bc98276 CS |
436 | } |
437 | ||
438 | /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/ | |
e3b78da8 | 439 | static int pim_update_upstream_nh_helper(struct hash_bucket *bucket, void *arg) |
1bc98276 | 440 | { |
7c591950 | 441 | struct pim_instance *pim = (struct pim_instance *)arg; |
e3b78da8 | 442 | struct pim_upstream *up = (struct pim_upstream *)bucket->data; |
d62a17ae | 443 | |
7c591950 DS |
444 | enum pim_rpf_result rpf_result; |
445 | struct pim_rpf old; | |
d62a17ae | 446 | |
7c591950 | 447 | old.source_nexthop.interface = up->rpf.source_nexthop.interface; |
8c55c132 | 448 | rpf_result = pim_rpf_update(pim, up, &old, __func__); |
d62a17ae | 449 | |
b36576e4 AK |
450 | /* update kernel multicast forwarding cache (MFC); if the |
451 | * RPF nbr is now unreachable the MFC has already been updated | |
452 | * by pim_rpf_clear | |
453 | */ | |
454 | if (rpf_result != PIM_RPF_FAILURE) | |
455 | pim_upstream_mroute_iif_update(up->channel_oil, __func__); | |
7c591950 | 456 | |
b36576e4 AK |
457 | if (rpf_result == PIM_RPF_CHANGED || |
458 | (rpf_result == PIM_RPF_FAILURE && old.source_nexthop.interface)) | |
cc67ccf9 | 459 | pim_zebra_upstream_rpf_changed(pim, up, &old); |
d62a17ae | 460 | |
7c591950 DS |
461 | |
462 | if (PIM_DEBUG_PIM_NHT) { | |
463 | zlog_debug("%s: NHT upstream %s(%s) old ifp %s new ifp %s", | |
957d93ea SP |
464 | __PRETTY_FUNCTION__, up->sg_str, pim->vrf->name, |
465 | old.source_nexthop.interface | |
f79f7a7b | 466 | ? old.source_nexthop.interface->name : "Unknown", |
b36576e4 AK |
467 | up->rpf.source_nexthop.interface |
468 | ? up->rpf.source_nexthop.interface->name : "Unknown"); | |
7c591950 DS |
469 | } |
470 | ||
471 | return HASHWALK_CONTINUE; | |
472 | } | |
473 | ||
474 | static int pim_update_upstream_nh(struct pim_instance *pim, | |
475 | struct pim_nexthop_cache *pnc) | |
476 | { | |
7c591950 | 477 | hash_walk(pnc->upstream_hash, pim_update_upstream_nh_helper, pim); |
d62a17ae | 478 | |
74389231 | 479 | pim_zebra_update_all_interfaces(pim); |
d62a17ae | 480 | |
481 | return 0; | |
1bc98276 CS |
482 | } |
483 | ||
d62a17ae | 484 | uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp) |
633988a7 | 485 | { |
d62a17ae | 486 | uint32_t hash_val; |
487 | uint32_t s = 0, g = 0; | |
488 | ||
489 | if ((!src)) | |
490 | return 0; | |
491 | ||
492 | switch (src->family) { | |
493 | case AF_INET: { | |
494 | s = src->u.prefix4.s_addr; | |
495 | s = s == 0 ? 1 : s; | |
496 | if (grp) | |
497 | g = grp->u.prefix4.s_addr; | |
498 | } break; | |
499 | default: | |
500 | break; | |
501 | } | |
502 | ||
503 | hash_val = jhash_2words(g, s, 101); | |
d62a17ae | 504 | return hash_val; |
633988a7 CS |
505 | } |
506 | ||
43763b11 DS |
507 | static int pim_ecmp_nexthop_search(struct pim_instance *pim, |
508 | struct pim_nexthop_cache *pnc, | |
509 | struct pim_nexthop *nexthop, | |
510 | struct prefix *src, struct prefix *grp, | |
511 | int neighbor_needed) | |
633988a7 | 512 | { |
c517178d | 513 | struct pim_neighbor *nbrs[MULTIPATH_NUM], *nbr = NULL; |
19967127 | 514 | struct interface *ifps[MULTIPATH_NUM]; |
d62a17ae | 515 | struct nexthop *nh_node = NULL; |
516 | ifindex_t first_ifindex; | |
517 | struct interface *ifp = NULL; | |
518 | uint32_t hash_val = 0, mod_val = 0; | |
519 | uint8_t nh_iter = 0, found = 0; | |
19967127 | 520 | uint32_t i, num_nbrs = 0; |
d62a17ae | 521 | |
522 | if (!pnc || !pnc->nexthop_num || !nexthop) | |
cb9c7c50 | 523 | return 0; |
d62a17ae | 524 | |
431f21d3 A |
525 | memset(&nbrs, 0, sizeof(nbrs)); |
526 | memset(&ifps, 0, sizeof(ifps)); | |
527 | ||
d62a17ae | 528 | // Current Nexthop is VALID, check to stay on the current path. |
529 | if (nexthop->interface && nexthop->interface->info | |
530 | && nexthop->mrib_nexthop_addr.u.prefix4.s_addr | |
531 | != PIM_NET_INADDR_ANY) { | |
532 | /* User configured knob to explicitly switch | |
533 | to new path is disabled or current path | |
534 | metric is less than nexthop update. | |
535 | */ | |
536 | ||
4795fff7 | 537 | if (pim->ecmp_rebalance_enable == 0) { |
d62a17ae | 538 | uint8_t curr_route_valid = 0; |
539 | // Check if current nexthop is present in new updated | |
540 | // Nexthop list. | |
541 | // If the current nexthop is not valid, candidate to | |
542 | // choose new Nexthop. | |
543 | for (nh_node = pnc->nexthop; nh_node; | |
1b5f8a1a | 544 | nh_node = nh_node->next) { |
d62a17ae | 545 | curr_route_valid = (nexthop->interface->ifindex |
546 | == nh_node->ifindex); | |
1b5f8a1a DS |
547 | if (curr_route_valid) |
548 | break; | |
549 | } | |
d62a17ae | 550 | |
551 | if (curr_route_valid | |
552 | && !pim_if_connected_to_source(nexthop->interface, | |
553 | src->u.prefix4)) { | |
554 | nbr = pim_neighbor_find( | |
555 | nexthop->interface, | |
556 | nexthop->mrib_nexthop_addr.u.prefix4); | |
557 | if (!nbr | |
558 | && !if_is_loopback(nexthop->interface)) { | |
5cef40fc | 559 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 560 | zlog_debug( |
561 | "%s: current nexthop does not have nbr ", | |
562 | __PRETTY_FUNCTION__); | |
563 | } else { | |
5cef40fc | 564 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 565 | char src_str[INET_ADDRSTRLEN]; |
566 | pim_inet4_dump("<addr?>", | |
567 | src->u.prefix4, | |
568 | src_str, | |
569 | sizeof(src_str)); | |
570 | char grp_str[INET_ADDRSTRLEN]; | |
571 | pim_inet4_dump("<addr?>", | |
572 | grp->u.prefix4, | |
573 | grp_str, | |
574 | sizeof(grp_str)); | |
575 | zlog_debug( | |
5cef40fc | 576 | "%s: (%s,%s)(%s) current nexthop %s is valid, skipping new path selection", |
d62a17ae | 577 | __PRETTY_FUNCTION__, |
578 | src_str, grp_str, | |
5cef40fc | 579 | pim->vrf->name, |
d62a17ae | 580 | nexthop->interface->name); |
581 | } | |
a7f95c76 | 582 | return 1; |
d62a17ae | 583 | } |
584 | } | |
585 | } | |
586 | } | |
19967127 DS |
587 | |
588 | /* | |
589 | * Look up all interfaces and neighbors, | |
590 | * store for later usage | |
591 | */ | |
592 | for (nh_node = pnc->nexthop, i = 0; nh_node; | |
593 | nh_node = nh_node->next, i++) { | |
594 | ifps[i] = if_lookup_by_index(nh_node->ifindex, pim->vrf_id); | |
595 | if (ifps[i]) { | |
596 | nbrs[i] = pim_neighbor_find(ifps[i], | |
597 | nh_node->gate.ipv4); | |
598 | if (nbrs[i] || pim_if_connected_to_source(ifps[i], | |
ff5d90c2 | 599 | |
19967127 DS |
600 | src->u.prefix4)) |
601 | num_nbrs++; | |
602 | } | |
603 | } | |
4795fff7 | 604 | if (pim->ecmp_enable) { |
19967127 DS |
605 | uint32_t consider = pnc->nexthop_num; |
606 | ||
607 | if (neighbor_needed && num_nbrs < consider) | |
608 | consider = num_nbrs; | |
609 | ||
610 | if (consider == 0) | |
611 | return 0; | |
612 | ||
d62a17ae | 613 | // PIM ECMP flag is enable then choose ECMP path. |
614 | hash_val = pim_compute_ecmp_hash(src, grp); | |
19967127 | 615 | mod_val = hash_val % consider; |
d62a17ae | 616 | } |
617 | ||
618 | for (nh_node = pnc->nexthop; nh_node && (found == 0); | |
619 | nh_node = nh_node->next) { | |
620 | first_ifindex = nh_node->ifindex; | |
19967127 | 621 | ifp = ifps[nh_iter]; |
d62a17ae | 622 | if (!ifp) { |
5cef40fc | 623 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 624 | char addr_str[INET_ADDRSTRLEN]; |
625 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
626 | addr_str, sizeof(addr_str)); | |
627 | zlog_debug( | |
5cef40fc | 628 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 629 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
630 | first_ifindex, addr_str, |
631 | pim->vrf->name); | |
d62a17ae | 632 | } |
633 | if (nh_iter == mod_val) | |
634 | mod_val++; // Select nexthpath | |
635 | nh_iter++; | |
636 | continue; | |
637 | } | |
638 | if (!ifp->info) { | |
5cef40fc | 639 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 640 | char addr_str[INET_ADDRSTRLEN]; |
641 | pim_inet4_dump("<addr?>", src->u.prefix4, | |
642 | addr_str, sizeof(addr_str)); | |
643 | zlog_debug( | |
5cef40fc | 644 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 645 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
646 | pim->vrf->name, first_ifindex, |
647 | addr_str); | |
d62a17ae | 648 | } |
649 | if (nh_iter == mod_val) | |
650 | mod_val++; // Select nexthpath | |
651 | nh_iter++; | |
652 | continue; | |
653 | } | |
654 | ||
655 | if (neighbor_needed | |
656 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
19967127 | 657 | nbr = nbrs[nh_iter]; |
d62a17ae | 658 | if (!nbr && !if_is_loopback(ifp)) { |
5cef40fc | 659 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 660 | zlog_debug( |
5cef40fc DS |
661 | "%s: pim nbr not found on input interface %s(%s)", |
662 | __PRETTY_FUNCTION__, ifp->name, | |
663 | pim->vrf->name); | |
d62a17ae | 664 | if (nh_iter == mod_val) |
665 | mod_val++; // Select nexthpath | |
666 | nh_iter++; | |
667 | continue; | |
668 | } | |
669 | } | |
670 | ||
671 | if (nh_iter == mod_val) { | |
672 | nexthop->interface = ifp; | |
673 | nexthop->mrib_nexthop_addr.family = AF_INET; | |
674 | nexthop->mrib_nexthop_addr.prefixlen = IPV4_MAX_BITLEN; | |
675 | nexthop->mrib_nexthop_addr.u.prefix4 = | |
676 | nh_node->gate.ipv4; | |
677 | nexthop->mrib_metric_preference = pnc->distance; | |
678 | nexthop->mrib_route_metric = pnc->metric; | |
679 | nexthop->last_lookup = src->u.prefix4; | |
680 | nexthop->last_lookup_time = pim_time_monotonic_usec(); | |
681 | nexthop->nbr = nbr; | |
682 | found = 1; | |
5cef40fc | 683 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 684 | char buf[INET_ADDRSTRLEN]; |
685 | char buf2[INET_ADDRSTRLEN]; | |
686 | char buf3[INET_ADDRSTRLEN]; | |
687 | pim_inet4_dump("<src?>", src->u.prefix4, buf2, | |
688 | sizeof(buf2)); | |
689 | pim_inet4_dump("<grp?>", grp->u.prefix4, buf3, | |
690 | sizeof(buf3)); | |
691 | pim_inet4_dump( | |
692 | "<rpf?>", | |
693 | nexthop->mrib_nexthop_addr.u.prefix4, | |
694 | buf, sizeof(buf)); | |
695 | zlog_debug( | |
5cef40fc | 696 | "%s: (%s,%s)(%s) selected nhop interface %s addr %s mod_val %u iter %d ecmp %d", |
d62a17ae | 697 | __PRETTY_FUNCTION__, buf2, buf3, |
5cef40fc | 698 | pim->vrf->name, ifp->name, buf, mod_val, |
4795fff7 | 699 | nh_iter, pim->ecmp_enable); |
d62a17ae | 700 | } |
701 | } | |
702 | nh_iter++; | |
703 | } | |
704 | ||
705 | if (found) | |
cb9c7c50 | 706 | return 1; |
d62a17ae | 707 | else |
cb9c7c50 | 708 | return 0; |
633988a7 CS |
709 | } |
710 | ||
d62a17ae | 711 | /* This API is used to parse Registered address nexthop update coming from Zebra |
712 | */ | |
121f9dee | 713 | int pim_parse_nexthop_update(ZAPI_CALLBACK_ARGS) |
1bc98276 | 714 | { |
d62a17ae | 715 | struct nexthop *nexthop; |
716 | struct nexthop *nhlist_head = NULL; | |
717 | struct nexthop *nhlist_tail = NULL; | |
d62a17ae | 718 | int i; |
719 | struct pim_rpf rpf; | |
720 | struct pim_nexthop_cache *pnc = NULL; | |
721 | struct pim_neighbor *nbr = NULL; | |
722 | struct interface *ifp = NULL; | |
723 | struct interface *ifp1 = NULL; | |
cf663ceb | 724 | struct vrf *vrf = vrf_lookup_by_id(vrf_id); |
819f099b | 725 | struct pim_instance *pim; |
4a749e2c | 726 | struct zapi_route nhr; |
819f099b DS |
727 | |
728 | if (!vrf) | |
729 | return 0; | |
730 | pim = vrf->info; | |
d62a17ae | 731 | |
7d30a959 DS |
732 | if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) { |
733 | if (PIM_DEBUG_PIM_NHT) | |
996c9314 LB |
734 | zlog_debug( |
735 | "%s: Decode of nexthop update from zebra failed", | |
736 | __PRETTY_FUNCTION__); | |
7d30a959 DS |
737 | return 0; |
738 | } | |
d62a17ae | 739 | |
121f9dee | 740 | if (cmd == ZEBRA_NEXTHOP_UPDATE) { |
4a749e2c | 741 | prefix_copy(&rpf.rpf_addr, &nhr.prefix); |
25b787a2 | 742 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 743 | if (!pnc) { |
5cef40fc | 744 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 745 | char buf[PREFIX2STR_BUFFER]; |
746 | prefix2str(&rpf.rpf_addr, buf, sizeof(buf)); | |
747 | zlog_debug( | |
748 | "%s: Skipping NHT update, addr %s is not in local cached DB.", | |
749 | __PRETTY_FUNCTION__, buf); | |
750 | } | |
751 | return 0; | |
752 | } | |
753 | } else { | |
754 | /* | |
755 | * We do not currently handle ZEBRA_IMPORT_CHECK_UPDATE | |
756 | */ | |
757 | return 0; | |
758 | } | |
759 | ||
760 | pnc->last_update = pim_time_monotonic_usec(); | |
d62a17ae | 761 | |
4a749e2c | 762 | if (nhr.nexthop_num) { |
d62a17ae | 763 | pnc->nexthop_num = 0; // Only increment for pim enabled rpf. |
764 | ||
4a749e2c DS |
765 | for (i = 0; i < nhr.nexthop_num; i++) { |
766 | nexthop = nexthop_from_zapi_nexthop(&nhr.nexthops[i]); | |
d62a17ae | 767 | switch (nexthop->type) { |
768 | case NEXTHOP_TYPE_IPV4: | |
d62a17ae | 769 | case NEXTHOP_TYPE_IPV4_IFINDEX: |
d62a17ae | 770 | case NEXTHOP_TYPE_IPV6: |
4a749e2c | 771 | case NEXTHOP_TYPE_BLACKHOLE: |
d62a17ae | 772 | break; |
66f5152f MB |
773 | case NEXTHOP_TYPE_IFINDEX: |
774 | /* | |
775 | * Connected route (i.e. no nexthop), use | |
776 | * RPF address from nexthop cache (i.e. | |
777 | * destination) as PIM nexthop. | |
778 | */ | |
56c1568b | 779 | nexthop->type = NEXTHOP_TYPE_IPV4_IFINDEX; |
66f5152f MB |
780 | nexthop->gate.ipv4 = |
781 | pnc->rpf.rpf_addr.u.prefix4; | |
782 | break; | |
d62a17ae | 783 | case NEXTHOP_TYPE_IPV6_IFINDEX: |
d62a17ae | 784 | ifp1 = if_lookup_by_index(nexthop->ifindex, |
25b787a2 | 785 | pim->vrf_id); |
d62a17ae | 786 | nbr = pim_neighbor_find_if(ifp1); |
787 | /* Overwrite with Nbr address as NH addr */ | |
5cef40fc | 788 | if (nbr) |
d62a17ae | 789 | nexthop->gate.ipv4 = nbr->source_addr; |
5cef40fc | 790 | else { |
d62a17ae | 791 | // Mark nexthop address to 0 until PIM |
792 | // Nbr is resolved. | |
793 | nexthop->gate.ipv4.s_addr = | |
794 | PIM_NET_INADDR_ANY; | |
795 | } | |
796 | ||
d62a17ae | 797 | break; |
798 | } | |
799 | ||
25b787a2 | 800 | ifp = if_lookup_by_index(nexthop->ifindex, pim->vrf_id); |
d62a17ae | 801 | if (!ifp) { |
5cef40fc | 802 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 803 | char buf[NEXTHOP_STRLEN]; |
804 | zlog_debug( | |
5cef40fc | 805 | "%s: could not find interface for ifindex %d(%s) (addr %s)", |
d62a17ae | 806 | __PRETTY_FUNCTION__, |
807 | nexthop->ifindex, | |
5cef40fc | 808 | pim->vrf->name, |
d62a17ae | 809 | nexthop2str(nexthop, buf, |
810 | sizeof(buf))); | |
811 | } | |
812 | nexthop_free(nexthop); | |
813 | continue; | |
814 | } | |
815 | ||
1b5f8a1a DS |
816 | if (PIM_DEBUG_PIM_NHT) { |
817 | char p_str[PREFIX2STR_BUFFER]; | |
4a749e2c DS |
818 | |
819 | prefix2str(&nhr.prefix, p_str, sizeof(p_str)); | |
1b5f8a1a DS |
820 | zlog_debug( |
821 | "%s: NHT addr %s(%s) %d-nhop via %s(%s) type %d distance:%u metric:%u ", | |
822 | __PRETTY_FUNCTION__, p_str, | |
823 | pim->vrf->name, i + 1, | |
824 | inet_ntoa(nexthop->gate.ipv4), | |
4a749e2c DS |
825 | ifp->name, nexthop->type, nhr.distance, |
826 | nhr.metric); | |
1b5f8a1a DS |
827 | } |
828 | ||
d62a17ae | 829 | if (!ifp->info) { |
59711f10 SK |
830 | /* |
831 | * Though Multicast is not enabled on this | |
832 | * Interface store it in database otheriwse we | |
833 | * may miss this update and this will not cause | |
834 | * any issue, because while choosing the path we | |
835 | * are ommitting the Interfaces which are not | |
836 | * multicast enabled | |
837 | */ | |
5cef40fc | 838 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 839 | char buf[NEXTHOP_STRLEN]; |
4a749e2c | 840 | |
d62a17ae | 841 | zlog_debug( |
5cef40fc | 842 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, addr %s)", |
d62a17ae | 843 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 844 | pim->vrf->name, |
d62a17ae | 845 | nexthop->ifindex, |
846 | nexthop2str(nexthop, buf, | |
847 | sizeof(buf))); | |
848 | } | |
d62a17ae | 849 | } |
850 | ||
851 | if (nhlist_tail) { | |
852 | nhlist_tail->next = nexthop; | |
853 | nhlist_tail = nexthop; | |
854 | } else { | |
855 | nhlist_tail = nexthop; | |
856 | nhlist_head = nexthop; | |
857 | } | |
858 | // Only keep track of nexthops which are PIM enabled. | |
859 | pnc->nexthop_num++; | |
860 | } | |
861 | /* Reset existing pnc->nexthop before assigning new list */ | |
862 | nexthops_free(pnc->nexthop); | |
863 | pnc->nexthop = nhlist_head; | |
864 | if (pnc->nexthop_num) { | |
865 | pnc->flags |= PIM_NEXTHOP_VALID; | |
4a749e2c DS |
866 | pnc->distance = nhr.distance; |
867 | pnc->metric = nhr.metric; | |
d62a17ae | 868 | } |
869 | } else { | |
870 | pnc->flags &= ~PIM_NEXTHOP_VALID; | |
4a749e2c | 871 | pnc->nexthop_num = nhr.nexthop_num; |
d62a17ae | 872 | nexthops_free(pnc->nexthop); |
873 | pnc->nexthop = NULL; | |
874 | } | |
2cb7234f | 875 | SET_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED); |
d62a17ae | 876 | |
5cef40fc | 877 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 878 | char buf[PREFIX2STR_BUFFER]; |
4a749e2c | 879 | prefix2str(&nhr.prefix, buf, sizeof(buf)); |
d62a17ae | 880 | zlog_debug( |
87ad28f4 | 881 | "%s: NHT Update for %s(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d", |
4a749e2c DS |
882 | __PRETTY_FUNCTION__, buf, pim->vrf->name, |
883 | nhr.nexthop_num, pnc->nexthop_num, vrf_id, | |
996c9314 | 884 | pnc->upstream_hash->count, listcount(pnc->rp_list)); |
d62a17ae | 885 | } |
886 | ||
bfc92019 | 887 | pim_rpf_set_refresh_time(pim); |
d62a17ae | 888 | |
889 | if (listcount(pnc->rp_list)) | |
25b787a2 | 890 | pim_update_rp_nh(pim, pnc); |
7c591950 | 891 | if (pnc->upstream_hash->count) |
cf663ceb | 892 | pim_update_upstream_nh(pim, pnc); |
d62a17ae | 893 | |
894 | return 0; | |
1bc98276 | 895 | } |
633988a7 | 896 | |
25b787a2 | 897 | int pim_ecmp_nexthop_lookup(struct pim_instance *pim, |
b938537b DS |
898 | struct pim_nexthop *nexthop, struct prefix *src, |
899 | struct prefix *grp, int neighbor_needed) | |
633988a7 | 900 | { |
43763b11 | 901 | struct pim_nexthop_cache *pnc; |
d62a17ae | 902 | struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM]; |
19967127 | 903 | struct pim_neighbor *nbrs[MULTIPATH_NUM], *nbr = NULL; |
43763b11 | 904 | struct pim_rpf rpf; |
d62a17ae | 905 | int num_ifindex; |
19967127 | 906 | struct interface *ifps[MULTIPATH_NUM], *ifp; |
d62a17ae | 907 | int first_ifindex; |
908 | int found = 0; | |
909 | uint8_t i = 0; | |
910 | uint32_t hash_val = 0, mod_val = 0; | |
19967127 | 911 | uint32_t num_nbrs = 0; |
b938537b | 912 | char addr_str[PREFIX_STRLEN]; |
d62a17ae | 913 | |
5cef40fc | 914 | if (PIM_DEBUG_PIM_NHT) { |
b938537b DS |
915 | pim_inet4_dump("<addr?>", src->u.prefix4, addr_str, |
916 | sizeof(addr_str)); | |
5cef40fc DS |
917 | zlog_debug("%s: Looking up: %s(%s), last lookup time: %lld", |
918 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name, | |
d62a17ae | 919 | nexthop->last_lookup_time); |
920 | } | |
921 | ||
43763b11 DS |
922 | memset(&rpf, 0, sizeof(struct pim_rpf)); |
923 | rpf.rpf_addr.family = AF_INET; | |
924 | rpf.rpf_addr.prefixlen = IPV4_MAX_BITLEN; | |
925 | rpf.rpf_addr.u.prefix4 = src->u.prefix4; | |
926 | ||
927 | pnc = pim_nexthop_cache_find(pim, &rpf); | |
2cb7234f DS |
928 | if (pnc) { |
929 | if (CHECK_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED)) | |
930 | return pim_ecmp_nexthop_search(pim, pnc, nexthop, src, grp, | |
931 | neighbor_needed); | |
932 | } | |
43763b11 | 933 | |
d62a17ae | 934 | memset(nexthop_tab, 0, |
935 | sizeof(struct pim_zlookup_nexthop) * MULTIPATH_NUM); | |
b938537b DS |
936 | num_ifindex = |
937 | zclient_lookup_nexthop(pim, nexthop_tab, MULTIPATH_NUM, | |
938 | src->u.prefix4, PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 939 | if (num_ifindex < 1) { |
b938537b | 940 | if (PIM_DEBUG_PIM_NHT) |
209a5679 DS |
941 | zlog_warn( |
942 | "%s: could not find nexthop ifindex for address %s(%s)", | |
996c9314 | 943 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); |
cb9c7c50 | 944 | return 0; |
d62a17ae | 945 | } |
946 | ||
431f21d3 A |
947 | memset(&nbrs, 0, sizeof(nbrs)); |
948 | memset(&ifps, 0, sizeof(ifps)); | |
949 | ||
19967127 DS |
950 | /* |
951 | * Look up all interfaces and neighbors, | |
952 | * store for later usage | |
953 | */ | |
954 | for (i = 0; i < num_ifindex; i++) { | |
955 | ifps[i] = if_lookup_by_index(nexthop_tab[i].ifindex, | |
956 | pim->vrf_id); | |
957 | if (ifps[i]) { | |
958 | nbrs[i] = pim_neighbor_find( | |
959 | ifps[i], nexthop_tab[i].nexthop_addr.u.prefix4); | |
b938537b DS |
960 | if (nbrs[i] |
961 | || pim_if_connected_to_source(ifps[i], | |
962 | src->u.prefix4)) | |
19967127 DS |
963 | num_nbrs++; |
964 | } | |
965 | } | |
966 | ||
d62a17ae | 967 | // If PIM ECMP enable then choose ECMP path. |
4795fff7 | 968 | if (pim->ecmp_enable) { |
19967127 DS |
969 | uint32_t consider = num_ifindex; |
970 | ||
971 | if (neighbor_needed && num_nbrs < consider) | |
972 | consider = num_nbrs; | |
973 | ||
974 | if (consider == 0) | |
975 | return 0; | |
976 | ||
d62a17ae | 977 | hash_val = pim_compute_ecmp_hash(src, grp); |
19967127 | 978 | mod_val = hash_val % consider; |
5cef40fc | 979 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
d62a17ae | 980 | zlog_debug("%s: hash_val %u mod_val %u", |
981 | __PRETTY_FUNCTION__, hash_val, mod_val); | |
982 | } | |
983 | ||
19967127 | 984 | i = 0; |
d62a17ae | 985 | while (!found && (i < num_ifindex)) { |
986 | first_ifindex = nexthop_tab[i].ifindex; | |
987 | ||
19967127 | 988 | ifp = ifps[i]; |
d62a17ae | 989 | if (!ifp) { |
b938537b | 990 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 991 | zlog_debug( |
5cef40fc | 992 | "%s %s: could not find interface for ifindex %d (address %s(%s))", |
d62a17ae | 993 | __FILE__, __PRETTY_FUNCTION__, |
5cef40fc DS |
994 | first_ifindex, addr_str, |
995 | pim->vrf->name); | |
d62a17ae | 996 | if (i == mod_val) |
997 | mod_val++; | |
998 | i++; | |
999 | continue; | |
1000 | } | |
1001 | ||
1002 | if (!ifp->info) { | |
b938537b | 1003 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 1004 | zlog_debug( |
5cef40fc | 1005 | "%s: multicast not enabled on input interface %s(%s) (ifindex=%d, RPF for source %s)", |
d62a17ae | 1006 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc DS |
1007 | pim->vrf->name, first_ifindex, |
1008 | addr_str); | |
d62a17ae | 1009 | if (i == mod_val) |
1010 | mod_val++; | |
1011 | i++; | |
1012 | continue; | |
1013 | } | |
b938537b DS |
1014 | if (neighbor_needed |
1015 | && !pim_if_connected_to_source(ifp, src->u.prefix4)) { | |
19967127 | 1016 | nbr = nbrs[i]; |
5cef40fc DS |
1017 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
1018 | zlog_debug("ifp name: %s(%s), pim nbr: %p", | |
1019 | ifp->name, pim->vrf->name, nbr); | |
d62a17ae | 1020 | if (!nbr && !if_is_loopback(ifp)) { |
1021 | if (i == mod_val) | |
1022 | mod_val++; | |
1023 | i++; | |
b938537b | 1024 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 1025 | zlog_debug( |
5cef40fc | 1026 | "%s: NBR not found on input interface %s(%s) (RPF for source %s)", |
d62a17ae | 1027 | __PRETTY_FUNCTION__, ifp->name, |
5cef40fc | 1028 | pim->vrf->name, addr_str); |
d62a17ae | 1029 | continue; |
1030 | } | |
1031 | } | |
1032 | ||
1033 | if (i == mod_val) { | |
5cef40fc | 1034 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 1035 | char nexthop_str[PREFIX_STRLEN]; |
b938537b | 1036 | |
d62a17ae | 1037 | pim_addr_dump("<nexthop?>", |
1038 | &nexthop_tab[i].nexthop_addr, | |
1039 | nexthop_str, sizeof(nexthop_str)); | |
d62a17ae | 1040 | zlog_debug( |
5cef40fc DS |
1041 | "%s: found nhop %s for addr %s interface %s(%s) metric %d dist %d", |
1042 | __PRETTY_FUNCTION__, nexthop_str, | |
1043 | addr_str, ifp->name, pim->vrf->name, | |
d62a17ae | 1044 | nexthop_tab[i].route_metric, |
1045 | nexthop_tab[i].protocol_distance); | |
1046 | } | |
1a81b790 | 1047 | /* update nexthop data */ |
d62a17ae | 1048 | nexthop->interface = ifp; |
1049 | nexthop->mrib_nexthop_addr = | |
1050 | nexthop_tab[i].nexthop_addr; | |
1051 | nexthop->mrib_metric_preference = | |
1052 | nexthop_tab[i].protocol_distance; | |
1053 | nexthop->mrib_route_metric = | |
1054 | nexthop_tab[i].route_metric; | |
b938537b | 1055 | nexthop->last_lookup = src->u.prefix4; |
d62a17ae | 1056 | nexthop->last_lookup_time = pim_time_monotonic_usec(); |
1057 | nexthop->nbr = nbr; | |
1058 | found = 1; | |
1059 | } | |
1060 | i++; | |
1061 | } | |
cb9c7c50 | 1062 | |
d62a17ae | 1063 | if (found) |
cb9c7c50 | 1064 | return 1; |
d62a17ae | 1065 | else |
cb9c7c50 | 1066 | return 0; |
633988a7 | 1067 | } |
815c33c9 | 1068 | |
25b787a2 | 1069 | int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim, |
b938537b | 1070 | struct prefix *src, struct prefix *grp) |
815c33c9 | 1071 | { |
8a5134aa | 1072 | struct pim_nexthop nhop; |
d62a17ae | 1073 | int vif_index; |
8a5134aa | 1074 | ifindex_t ifindex; |
b938537b | 1075 | char addr_str[PREFIX_STRLEN]; |
d62a17ae | 1076 | |
b938537b DS |
1077 | if (PIM_DEBUG_PIM_NHT) |
1078 | pim_inet4_dump("<addr?>", src->u.prefix4, addr_str, | |
1079 | sizeof(addr_str)); | |
2ccc414b DS |
1080 | |
1081 | memset(&nhop, 0, sizeof(nhop)); | |
b938537b DS |
1082 | if (!pim_ecmp_nexthop_lookup(pim, &nhop, src, grp, 0)) { |
1083 | if (PIM_DEBUG_PIM_NHT) | |
d62a17ae | 1084 | zlog_debug( |
5cef40fc DS |
1085 | "%s: could not find nexthop ifindex for address %s(%s)", |
1086 | __PRETTY_FUNCTION__, addr_str, pim->vrf->name); | |
d62a17ae | 1087 | return -1; |
1088 | } | |
1089 | ||
8a5134aa | 1090 | ifindex = nhop.interface->ifindex; |
b938537b | 1091 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 1092 | zlog_debug( |
5cef40fc | 1093 | "%s: found nexthop ifindex=%d (interface %s(%s)) for address %s", |
8a5134aa DS |
1094 | __PRETTY_FUNCTION__, ifindex, |
1095 | ifindex2ifname(ifindex, pim->vrf_id), | |
5cef40fc | 1096 | pim->vrf->name, addr_str); |
d62a17ae | 1097 | |
8a5134aa | 1098 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); |
d62a17ae | 1099 | |
1100 | if (vif_index < 0) { | |
5cef40fc | 1101 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 1102 | zlog_debug( |
5cef40fc DS |
1103 | "%s: low vif_index=%d(%s) < 1 nexthop for address %s", |
1104 | __PRETTY_FUNCTION__, vif_index, pim->vrf->name, | |
d62a17ae | 1105 | addr_str); |
1106 | } | |
1107 | return -2; | |
1108 | } | |
1109 | ||
1110 | return vif_index; | |
815c33c9 | 1111 | } |