]>
Commit | Line | Data |
---|---|---|
acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1bc98276 CS |
2 | /* |
3 | * PIM for Quagga | |
4 | * Copyright (C) 2017 Cumulus Networks, Inc. | |
5 | * Chirag Shah | |
1bc98276 CS |
6 | */ |
7 | #include <zebra.h> | |
8 | #include "network.h" | |
9 | #include "zclient.h" | |
10 | #include "stream.h" | |
11 | #include "nexthop.h" | |
12 | #include "if.h" | |
13 | #include "hash.h" | |
14 | #include "jhash.h" | |
15 | ||
2dbe669b DA |
16 | #include "lib/printfrr.h" |
17 | ||
1bc98276 CS |
18 | #include "pimd.h" |
19 | #include "pimd/pim_nht.h" | |
993e3d8e | 20 | #include "pim_instance.h" |
1bc98276 CS |
21 | #include "log.h" |
22 | #include "pim_time.h" | |
23 | #include "pim_oil.h" | |
24 | #include "pim_ifchannel.h" | |
25 | #include "pim_mroute.h" | |
26 | #include "pim_zebra.h" | |
27 | #include "pim_upstream.h" | |
28 | #include "pim_join.h" | |
29 | #include "pim_jp_agg.h" | |
30 | #include "pim_zebra.h" | |
633988a7 | 31 | #include "pim_zlookup.h" |
640b8d93 | 32 | #include "pim_rp.h" |
90ab4458 | 33 | #include "pim_addr.h" |
1bc98276 CS |
34 | |
35 | /** | |
36 | * pim_sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister | |
37 | * command to Zebra. | |
38 | */ | |
64c86530 | 39 | void pim_sendmsg_zebra_rnh(struct pim_instance *pim, struct zclient *zclient, |
d62a17ae | 40 | struct pim_nexthop_cache *pnc, int command) |
1bc98276 | 41 | { |
6288ebcf | 42 | struct prefix p; |
d62a17ae | 43 | int ret; |
44 | ||
6288ebcf | 45 | pim_addr_to_prefix(&p, pnc->rpf.rpf_addr); |
46 | ret = zclient_send_rnh(zclient, command, &p, SAFI_UNICAST, false, false, | |
ed6cec97 | 47 | pim->vrf->vrf_id); |
7cfdb485 | 48 | if (ret == ZCLIENT_SEND_FAILURE) |
d62a17ae | 49 | zlog_warn("sendmsg_nexthop: zclient_send_message() failed"); |
50 | ||
2dbe669b | 51 | if (PIM_DEBUG_PIM_NHT) |
5cef40fc | 52 | zlog_debug( |
2dbe669b | 53 | "%s: NHT %sregistered addr %pFX(%s) with Zebra ret:%d ", |
15569c58 | 54 | __func__, |
6288ebcf | 55 | (command == ZEBRA_NEXTHOP_REGISTER) ? " " : "de", &p, |
5cef40fc | 56 | pim->vrf->name, ret); |
d62a17ae | 57 | |
58 | return; | |
1bc98276 CS |
59 | } |
60 | ||
d0a4f55d DS |
61 | struct pim_nexthop_cache *pim_nexthop_cache_find(struct pim_instance *pim, |
62 | struct pim_rpf *rpf) | |
1bc98276 | 63 | { |
d62a17ae | 64 | struct pim_nexthop_cache *pnc = NULL; |
65 | struct pim_nexthop_cache lookup; | |
1bc98276 | 66 | |
90ab4458 | 67 | lookup.rpf.rpf_addr = rpf->rpf_addr; |
d0a4f55d | 68 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
1bc98276 | 69 | |
d62a17ae | 70 | return pnc; |
1bc98276 CS |
71 | } |
72 | ||
5cef40fc DS |
73 | static struct pim_nexthop_cache *pim_nexthop_cache_add(struct pim_instance *pim, |
74 | struct pim_rpf *rpf_addr) | |
1bc98276 | 75 | { |
d62a17ae | 76 | struct pim_nexthop_cache *pnc; |
9fb302f4 | 77 | char hash_name[64]; |
d62a17ae | 78 | |
79 | pnc = XCALLOC(MTYPE_PIM_NEXTHOP_CACHE, | |
80 | sizeof(struct pim_nexthop_cache)); | |
90ab4458 | 81 | pnc->rpf.rpf_addr = rpf_addr->rpf_addr; |
d62a17ae | 82 | |
d0a4f55d | 83 | pnc = hash_get(pim->rpf_hash, pnc, hash_alloc_intern); |
d62a17ae | 84 | |
85 | pnc->rp_list = list_new(); | |
86 | pnc->rp_list->cmp = pim_rp_list_cmp; | |
87 | ||
6288ebcf | 88 | snprintfrr(hash_name, sizeof(hash_name), "PNC %pPA(%s) Upstream Hash", |
2dbe669b | 89 | &pnc->rpf.rpf_addr, pim->vrf->name); |
7c591950 | 90 | pnc->upstream_hash = hash_create_size(8192, pim_upstream_hash_key, |
996c9314 | 91 | pim_upstream_equal, hash_name); |
d62a17ae | 92 | |
d62a17ae | 93 | return pnc; |
1bc98276 CS |
94 | } |
95 | ||
4efdb9c6 | 96 | static struct pim_nexthop_cache *pim_nht_get(struct pim_instance *pim, |
e6e53006 | 97 | pim_addr addr) |
1bc98276 | 98 | { |
d62a17ae | 99 | struct pim_nexthop_cache *pnc = NULL; |
100 | struct pim_rpf rpf; | |
d62a17ae | 101 | struct zclient *zclient = NULL; |
102 | ||
103 | zclient = pim_zebra_zclient_get(); | |
6006b807 | 104 | memset(&rpf, 0, sizeof(rpf)); |
e6e53006 | 105 | rpf.rpf_addr = addr; |
d62a17ae | 106 | |
25bdac42 | 107 | pnc = pim_nexthop_cache_find(pim, &rpf); |
d62a17ae | 108 | if (!pnc) { |
25bdac42 | 109 | pnc = pim_nexthop_cache_add(pim, &rpf); |
5cef40fc DS |
110 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, |
111 | ZEBRA_NEXTHOP_REGISTER); | |
6d733f0d | 112 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
5cef40fc | 113 | zlog_debug( |
6288ebcf | 114 | "%s: NHT cache and zebra notification added for %pPA(%s)", |
e6e53006 | 115 | __func__, &addr, pim->vrf->name); |
d62a17ae | 116 | } |
117 | ||
4efdb9c6 DL |
118 | return pnc; |
119 | } | |
120 | ||
121 | /* TBD: this does several distinct things and should probably be split up. | |
122 | * (checking state vs. returning pnc vs. adding upstream vs. adding rp) | |
123 | */ | |
e6e53006 | 124 | int pim_find_or_track_nexthop(struct pim_instance *pim, pim_addr addr, |
4efdb9c6 DL |
125 | struct pim_upstream *up, struct rp_info *rp, |
126 | struct pim_nexthop_cache *out_pnc) | |
127 | { | |
128 | struct pim_nexthop_cache *pnc; | |
129 | struct listnode *ch_node = NULL; | |
130 | ||
131 | pnc = pim_nht_get(pim, addr); | |
132 | ||
e6e53006 | 133 | assertf(up || rp, "addr=%pPA", &addr); |
4efdb9c6 | 134 | |
d62a17ae | 135 | if (rp != NULL) { |
136 | ch_node = listnode_lookup(pnc->rp_list, rp); | |
5cef40fc | 137 | if (ch_node == NULL) |
d62a17ae | 138 | listnode_add_sort(pnc->rp_list, rp); |
d62a17ae | 139 | } |
140 | ||
7c591950 | 141 | if (up != NULL) |
8e3aae66 | 142 | (void)hash_get(pnc->upstream_hash, up, hash_alloc_intern); |
d62a17ae | 143 | |
2b57b948 | 144 | if (CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) { |
43763b11 DS |
145 | if (out_pnc) |
146 | memcpy(out_pnc, pnc, sizeof(struct pim_nexthop_cache)); | |
d62a17ae | 147 | return 1; |
148 | } | |
149 | ||
150 | return 0; | |
1bc98276 CS |
151 | } |
152 | ||
53bbfd53 | 153 | void pim_nht_bsr_add(struct pim_instance *pim, pim_addr addr) |
4efdb9c6 DL |
154 | { |
155 | struct pim_nexthop_cache *pnc; | |
4efdb9c6 | 156 | |
e6e53006 | 157 | pnc = pim_nht_get(pim, addr); |
4efdb9c6 DL |
158 | |
159 | pnc->bsr_count++; | |
160 | } | |
161 | ||
162 | static void pim_nht_drop_maybe(struct pim_instance *pim, | |
163 | struct pim_nexthop_cache *pnc) | |
164 | { | |
165 | if (PIM_DEBUG_PIM_NHT) | |
166 | zlog_debug( | |
6288ebcf | 167 | "%s: NHT %pPA(%s) rp_list count:%d upstream count:%ld BSR count:%u", |
4efdb9c6 DL |
168 | __func__, &pnc->rpf.rpf_addr, pim->vrf->name, |
169 | pnc->rp_list->count, pnc->upstream_hash->count, | |
170 | pnc->bsr_count); | |
171 | ||
172 | if (pnc->rp_list->count == 0 && pnc->upstream_hash->count == 0 | |
173 | && pnc->bsr_count == 0) { | |
174 | struct zclient *zclient = pim_zebra_zclient_get(); | |
175 | ||
176 | pim_sendmsg_zebra_rnh(pim, zclient, pnc, | |
177 | ZEBRA_NEXTHOP_UNREGISTER); | |
178 | ||
179 | list_delete(&pnc->rp_list); | |
180 | hash_free(pnc->upstream_hash); | |
181 | ||
182 | hash_release(pim->rpf_hash, pnc); | |
183 | if (pnc->nexthop) | |
184 | nexthops_free(pnc->nexthop); | |
185 | XFREE(MTYPE_PIM_NEXTHOP_CACHE, pnc); | |
186 | } | |
187 | } | |
188 | ||
e6e53006 | 189 | void pim_delete_tracked_nexthop(struct pim_instance *pim, pim_addr addr, |
4efdb9c6 | 190 | struct pim_upstream *up, struct rp_info *rp) |
1bc98276 | 191 | { |
d62a17ae | 192 | struct pim_nexthop_cache *pnc = NULL; |
193 | struct pim_nexthop_cache lookup; | |
246445a3 | 194 | struct pim_upstream *upstream = NULL; |
d62a17ae | 195 | |
d62a17ae | 196 | /* Remove from RPF hash if it is the last entry */ |
e6e53006 | 197 | lookup.rpf.rpf_addr = addr; |
d0a4f55d | 198 | pnc = hash_lookup(pim->rpf_hash, &lookup); |
4efdb9c6 | 199 | if (!pnc) { |
6288ebcf | 200 | zlog_warn("attempting to delete nonexistent NHT entry %pPA", |
e6e53006 | 201 | &addr); |
4efdb9c6 DL |
202 | return; |
203 | } | |
204 | ||
205 | if (rp) { | |
206 | /* Release the (*, G)upstream from pnc->upstream_hash, | |
207 | * whose Group belongs to the RP getting deleted | |
208 | */ | |
209 | frr_each (rb_pim_upstream, &pim->upstream_head, upstream) { | |
210 | struct prefix grp; | |
211 | struct rp_info *trp_info; | |
212 | ||
2a27f13b | 213 | if (!pim_addr_is_any(upstream->sg.src)) |
4efdb9c6 DL |
214 | continue; |
215 | ||
c631920c | 216 | pim_addr_to_prefix(&grp, upstream->sg.grp); |
4efdb9c6 DL |
217 | trp_info = pim_rp_find_match_group(pim, &grp); |
218 | if (trp_info == rp) | |
219 | hash_release(pnc->upstream_hash, upstream); | |
246445a3 | 220 | } |
4efdb9c6 DL |
221 | listnode_delete(pnc->rp_list, rp); |
222 | } | |
246445a3 | 223 | |
4efdb9c6 DL |
224 | if (up) |
225 | hash_release(pnc->upstream_hash, up); | |
d62a17ae | 226 | |
4efdb9c6 DL |
227 | pim_nht_drop_maybe(pim, pnc); |
228 | } | |
4533b847 | 229 | |
53bbfd53 | 230 | void pim_nht_bsr_del(struct pim_instance *pim, pim_addr addr) |
4efdb9c6 DL |
231 | { |
232 | struct pim_nexthop_cache *pnc = NULL; | |
233 | struct pim_nexthop_cache lookup; | |
234 | ||
5f010b12 DS |
235 | /* |
236 | * Nothing to do here if the address to unregister | |
237 | * is 0.0.0.0 as that the BSR has not been registered | |
238 | * for tracking yet. | |
239 | */ | |
53bbfd53 | 240 | if (pim_addr_is_any(addr)) |
5f010b12 DS |
241 | return; |
242 | ||
6288ebcf | 243 | lookup.rpf.rpf_addr = addr; |
4efdb9c6 DL |
244 | |
245 | pnc = hash_lookup(pim->rpf_hash, &lookup); | |
246 | ||
247 | if (!pnc) { | |
53bbfd53 | 248 | zlog_warn("attempting to delete nonexistent NHT BSR entry %pPA", |
4efdb9c6 DL |
249 | &addr); |
250 | return; | |
251 | } | |
252 | ||
53bbfd53 | 253 | assertf(pnc->bsr_count > 0, "addr=%pPA", &addr); |
4efdb9c6 DL |
254 | pnc->bsr_count--; |
255 | ||
256 | pim_nht_drop_maybe(pim, pnc); | |
257 | } | |
258 | ||
53bbfd53 | 259 | bool pim_nht_bsr_rpf_check(struct pim_instance *pim, pim_addr bsr_addr, |
76bfa030 | 260 | struct interface *src_ifp, pim_addr src_ip) |
4efdb9c6 DL |
261 | { |
262 | struct pim_nexthop_cache *pnc = NULL; | |
263 | struct pim_nexthop_cache lookup; | |
caef8f79 | 264 | struct pim_neighbor *nbr = NULL; |
4efdb9c6 | 265 | struct nexthop *nh; |
caef8f79 | 266 | struct interface *ifp; |
4efdb9c6 | 267 | |
6288ebcf | 268 | lookup.rpf.rpf_addr = bsr_addr; |
4efdb9c6 DL |
269 | |
270 | pnc = hash_lookup(pim->rpf_hash, &lookup); | |
caef8f79 DL |
271 | if (!pnc || !CHECK_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED)) { |
272 | /* BSM from a new freshly registered BSR - do a synchronous | |
273 | * zebra query since otherwise we'd drop the first packet, | |
274 | * leading to additional delay in picking up BSM data | |
275 | */ | |
276 | ||
277 | /* FIXME: this should really be moved into a generic NHT | |
278 | * function that does "add and get immediate result" or maybe | |
279 | * "check cache or get immediate result." But until that can | |
280 | * be worked in, here's a copy of the code below :( | |
281 | */ | |
75700af6 | 282 | struct pim_zlookup_nexthop nexthop_tab[router->multipath]; |
caef8f79 DL |
283 | ifindex_t i; |
284 | struct interface *ifp = NULL; | |
285 | int num_ifindex; | |
286 | ||
287 | memset(nexthop_tab, 0, sizeof(nexthop_tab)); | |
75700af6 DS |
288 | num_ifindex = zclient_lookup_nexthop( |
289 | pim, nexthop_tab, router->multipath, bsr_addr, | |
290 | PIM_NEXTHOP_LOOKUP_MAX); | |
caef8f79 DL |
291 | |
292 | if (num_ifindex <= 0) | |
293 | return false; | |
294 | ||
295 | for (i = 0; i < num_ifindex; i++) { | |
296 | struct pim_zlookup_nexthop *znh = &nexthop_tab[i]; | |
297 | ||
298 | /* pim_zlookup_nexthop has no ->type */ | |
299 | ||
300 | /* 1:1 match code below with znh instead of nh */ | |
301 | ifp = if_lookup_by_index(znh->ifindex, | |
302 | pim->vrf->vrf_id); | |
303 | ||
304 | if (!ifp || !ifp->info) | |
305 | continue; | |
306 | ||
307 | if (if_is_loopback(ifp) && if_is_loopback(src_ifp)) | |
308 | return true; | |
309 | ||
2c6a32f9 | 310 | nbr = pim_neighbor_find(ifp, znh->nexthop_addr, true); |
caef8f79 DL |
311 | if (!nbr) |
312 | continue; | |
313 | ||
2c6a32f9 | 314 | return znh->ifindex == src_ifp->ifindex; |
caef8f79 | 315 | } |
4efdb9c6 | 316 | return false; |
caef8f79 DL |
317 | } |
318 | ||
4efdb9c6 DL |
319 | if (!CHECK_FLAG(pnc->flags, PIM_NEXTHOP_VALID)) |
320 | return false; | |
321 | ||
322 | /* if we accept BSMs from more than one ECMP nexthop, this will cause | |
323 | * BSM message "multiplication" for each ECMP hop. i.e. if you have | |
324 | * 4-way ECMP and 4 hops you end up with 256 copies of each BSM | |
325 | * message. | |
326 | * | |
caef8f79 | 327 | * so... only accept the first (IPv4) valid nexthop as source. |
4efdb9c6 DL |
328 | */ |
329 | ||
330 | for (nh = pnc->nexthop; nh; nh = nh->next) { | |
9bb93fa0 | 331 | pim_addr nhaddr; |
1bc98276 | 332 | |
caef8f79 | 333 | switch (nh->type) { |
ae449dc5 | 334 | #if PIM_IPV == 4 |
caef8f79 DL |
335 | case NEXTHOP_TYPE_IPV4: |
336 | if (nh->ifindex == IFINDEX_INTERNAL) | |
337 | continue; | |
4b936634 | 338 | |
caef8f79 DL |
339 | /* fallthru */ |
340 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
341 | nhaddr = nh->gate.ipv4; | |
342 | break; | |
da21ae9d DS |
343 | case NEXTHOP_TYPE_IPV6: |
344 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
345 | continue; | |
9bb93fa0 DL |
346 | #else |
347 | case NEXTHOP_TYPE_IPV6: | |
348 | if (nh->ifindex == IFINDEX_INTERNAL) | |
349 | continue; | |
4b936634 | 350 | |
9bb93fa0 DL |
351 | /* fallthru */ |
352 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
353 | nhaddr = nh->gate.ipv6; | |
354 | break; | |
da21ae9d DS |
355 | case NEXTHOP_TYPE_IPV4: |
356 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
357 | continue; | |
9bb93fa0 | 358 | #endif |
caef8f79 DL |
359 | case NEXTHOP_TYPE_IFINDEX: |
360 | nhaddr = bsr_addr; | |
361 | break; | |
4b936634 | 362 | |
da21ae9d | 363 | case NEXTHOP_TYPE_BLACKHOLE: |
4b936634 | 364 | continue; |
365 | } | |
366 | ||
caef8f79 DL |
367 | ifp = if_lookup_by_index(nh->ifindex, pim->vrf->vrf_id); |
368 | if (!ifp || !ifp->info) | |
4b936634 | 369 | continue; |
4b936634 | 370 | |
caef8f79 | 371 | if (if_is_loopback(ifp) && if_is_loopback(src_ifp)) |
f06c4576 | 372 | return true; |
4b936634 | 373 | |
caef8f79 | 374 | /* MRIB (IGP) may be pointing at a router where PIM is down */ |
2c6a32f9 SP |
375 | |
376 | nbr = pim_neighbor_find(ifp, nhaddr, true); | |
377 | ||
caef8f79 | 378 | if (!nbr) |
4b936634 | 379 | continue; |
4b936634 | 380 | |
2c6a32f9 | 381 | return nh->ifindex == src_ifp->ifindex; |
4b936634 | 382 | } |
f06c4576 | 383 | return false; |
4b936634 | 384 | } |
385 | ||
640b8d93 SP |
386 | void pim_rp_nexthop_del(struct rp_info *rp_info) |
387 | { | |
388 | rp_info->rp.source_nexthop.interface = NULL; | |
dac86a0a | 389 | rp_info->rp.source_nexthop.mrib_nexthop_addr = PIMADDR_ANY; |
640b8d93 SP |
390 | rp_info->rp.source_nexthop.mrib_metric_preference = |
391 | router->infinite_assert_metric.metric_preference; | |
392 | rp_info->rp.source_nexthop.mrib_route_metric = | |
393 | router->infinite_assert_metric.route_metric; | |
394 | } | |
395 | ||
1bc98276 | 396 | /* Update RP nexthop info based on Nexthop update received from Zebra.*/ |
a7f95c76 DS |
397 | static void pim_update_rp_nh(struct pim_instance *pim, |
398 | struct pim_nexthop_cache *pnc) | |
1bc98276 | 399 | { |
d62a17ae | 400 | struct listnode *node = NULL; |
401 | struct rp_info *rp_info = NULL; | |
d62a17ae | 402 | |
403 | /*Traverse RP list and update each RP Nexthop info */ | |
404 | for (ALL_LIST_ELEMENTS_RO(pnc->rp_list, node, rp_info)) { | |
cc144e8b | 405 | if (pim_rpf_addr_is_inaddr_any(&rp_info->rp)) |
d62a17ae | 406 | continue; |
407 | ||
408 | // Compute PIM RPF using cached nexthop | |
43763b11 | 409 | if (!pim_ecmp_nexthop_lookup(pim, &rp_info->rp.source_nexthop, |
e6e53006 | 410 | rp_info->rp.rpf_addr, |
43763b11 | 411 | &rp_info->group, 1)) |
640b8d93 | 412 | pim_rp_nexthop_del(rp_info); |
d62a17ae | 413 | } |
1bc98276 CS |
414 | } |
415 | ||
416 | /* Update Upstream nexthop info based on Nexthop update received from Zebra.*/ | |
e3b78da8 | 417 | static int pim_update_upstream_nh_helper(struct hash_bucket *bucket, void *arg) |
1bc98276 | 418 | { |
7c591950 | 419 | struct pim_instance *pim = (struct pim_instance *)arg; |
e3b78da8 | 420 | struct pim_upstream *up = (struct pim_upstream *)bucket->data; |
d62a17ae | 421 | |
7c591950 DS |
422 | enum pim_rpf_result rpf_result; |
423 | struct pim_rpf old; | |
d62a17ae | 424 | |
7c591950 | 425 | old.source_nexthop.interface = up->rpf.source_nexthop.interface; |
8c55c132 | 426 | rpf_result = pim_rpf_update(pim, up, &old, __func__); |
d62a17ae | 427 | |
b36576e4 AK |
428 | /* update kernel multicast forwarding cache (MFC); if the |
429 | * RPF nbr is now unreachable the MFC has already been updated | |
430 | * by pim_rpf_clear | |
431 | */ | |
f7896836 | 432 | if (rpf_result == PIM_RPF_CHANGED) |
b36576e4 | 433 | pim_upstream_mroute_iif_update(up->channel_oil, __func__); |
7c591950 | 434 | |
b36576e4 AK |
435 | if (rpf_result == PIM_RPF_CHANGED || |
436 | (rpf_result == PIM_RPF_FAILURE && old.source_nexthop.interface)) | |
cc67ccf9 | 437 | pim_zebra_upstream_rpf_changed(pim, up, &old); |
d62a17ae | 438 | |
7c591950 DS |
439 | |
440 | if (PIM_DEBUG_PIM_NHT) { | |
15569c58 DA |
441 | zlog_debug( |
442 | "%s: NHT upstream %s(%s) old ifp %s new ifp %s", | |
443 | __func__, up->sg_str, pim->vrf->name, | |
444 | old.source_nexthop.interface ? old.source_nexthop | |
445 | .interface->name | |
446 | : "Unknown", | |
447 | up->rpf.source_nexthop.interface ? up->rpf.source_nexthop | |
448 | .interface->name | |
449 | : "Unknown"); | |
7c591950 DS |
450 | } |
451 | ||
452 | return HASHWALK_CONTINUE; | |
453 | } | |
454 | ||
455 | static int pim_update_upstream_nh(struct pim_instance *pim, | |
456 | struct pim_nexthop_cache *pnc) | |
457 | { | |
7c591950 | 458 | hash_walk(pnc->upstream_hash, pim_update_upstream_nh_helper, pim); |
d62a17ae | 459 | |
74389231 | 460 | pim_zebra_update_all_interfaces(pim); |
d62a17ae | 461 | |
462 | return 0; | |
1bc98276 CS |
463 | } |
464 | ||
93d4f4f0 SP |
465 | static int pim_upstream_nh_if_update_helper(struct hash_bucket *bucket, |
466 | void *arg) | |
467 | { | |
468 | struct pim_nexthop_cache *pnc = bucket->data; | |
469 | struct pnc_hash_walk_data *pwd = arg; | |
470 | struct pim_instance *pim = pwd->pim; | |
471 | struct interface *ifp = pwd->ifp; | |
472 | struct nexthop *nh_node = NULL; | |
473 | ifindex_t first_ifindex; | |
474 | ||
475 | for (nh_node = pnc->nexthop; nh_node; nh_node = nh_node->next) { | |
476 | first_ifindex = nh_node->ifindex; | |
477 | if (ifp != if_lookup_by_index(first_ifindex, pim->vrf->vrf_id)) | |
478 | continue; | |
479 | ||
480 | if (pnc->upstream_hash->count) { | |
481 | pim_update_upstream_nh(pim, pnc); | |
482 | break; | |
483 | } | |
484 | } | |
485 | ||
486 | return HASHWALK_CONTINUE; | |
487 | } | |
488 | ||
489 | void pim_upstream_nh_if_update(struct pim_instance *pim, struct interface *ifp) | |
490 | { | |
491 | struct pnc_hash_walk_data pwd; | |
492 | ||
493 | pwd.pim = pim; | |
494 | pwd.ifp = ifp; | |
495 | ||
496 | hash_walk(pim->rpf_hash, pim_upstream_nh_if_update_helper, &pwd); | |
497 | } | |
498 | ||
d62a17ae | 499 | uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp) |
633988a7 | 500 | { |
d62a17ae | 501 | uint32_t hash_val; |
d62a17ae | 502 | |
bc97f40d | 503 | if (!src) |
d62a17ae | 504 | return 0; |
505 | ||
bc97f40d DL |
506 | hash_val = prefix_hash_key(src); |
507 | if (grp) | |
508 | hash_val ^= prefix_hash_key(grp); | |
d62a17ae | 509 | return hash_val; |
633988a7 CS |
510 | } |
511 | ||
43763b11 DS |
512 | static int pim_ecmp_nexthop_search(struct pim_instance *pim, |
513 | struct pim_nexthop_cache *pnc, | |
e6e53006 | 514 | struct pim_nexthop *nexthop, pim_addr src, |
6288ebcf | 515 | struct prefix *grp, int neighbor_needed) |
633988a7 | 516 | { |
75700af6 DS |
517 | struct pim_neighbor *nbrs[router->multipath], *nbr = NULL; |
518 | struct interface *ifps[router->multipath]; | |
d62a17ae | 519 | struct nexthop *nh_node = NULL; |
520 | ifindex_t first_ifindex; | |
521 | struct interface *ifp = NULL; | |
522 | uint32_t hash_val = 0, mod_val = 0; | |
523 | uint8_t nh_iter = 0, found = 0; | |
19967127 | 524 | uint32_t i, num_nbrs = 0; |
31b66ed6 | 525 | struct pim_interface *pim_ifp; |
d62a17ae | 526 | |
527 | if (!pnc || !pnc->nexthop_num || !nexthop) | |
cb9c7c50 | 528 | return 0; |
d62a17ae | 529 | |
b6467a42 SG |
530 | pim_addr nh_addr = nexthop->mrib_nexthop_addr; |
531 | pim_addr grp_addr = pim_addr_from_prefix(grp); | |
532 | ||
431f21d3 A |
533 | memset(&nbrs, 0, sizeof(nbrs)); |
534 | memset(&ifps, 0, sizeof(ifps)); | |
535 | ||
90ab4458 | 536 | |
d62a17ae | 537 | // Current Nexthop is VALID, check to stay on the current path. |
90ab4458 | 538 | if (nexthop->interface && nexthop->interface->info && |
539 | (!pim_addr_is_any(nh_addr))) { | |
d62a17ae | 540 | /* User configured knob to explicitly switch |
541 | to new path is disabled or current path | |
542 | metric is less than nexthop update. | |
543 | */ | |
544 | ||
4795fff7 | 545 | if (pim->ecmp_rebalance_enable == 0) { |
d62a17ae | 546 | uint8_t curr_route_valid = 0; |
547 | // Check if current nexthop is present in new updated | |
548 | // Nexthop list. | |
549 | // If the current nexthop is not valid, candidate to | |
550 | // choose new Nexthop. | |
551 | for (nh_node = pnc->nexthop; nh_node; | |
1b5f8a1a | 552 | nh_node = nh_node->next) { |
d62a17ae | 553 | curr_route_valid = (nexthop->interface->ifindex |
554 | == nh_node->ifindex); | |
1b5f8a1a DS |
555 | if (curr_route_valid) |
556 | break; | |
557 | } | |
d62a17ae | 558 | |
bc97f40d DL |
559 | if (curr_route_valid && |
560 | !pim_if_connected_to_source(nexthop->interface, | |
e6e53006 | 561 | src)) { |
dac86a0a | 562 | nbr = pim_neighbor_find( |
d62a17ae | 563 | nexthop->interface, |
ae5bcac0 | 564 | nexthop->mrib_nexthop_addr, true); |
d62a17ae | 565 | if (!nbr |
566 | && !if_is_loopback(nexthop->interface)) { | |
5cef40fc | 567 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 568 | zlog_debug( |
569 | "%s: current nexthop does not have nbr ", | |
15569c58 | 570 | __func__); |
d62a17ae | 571 | } else { |
20fcf61c AK |
572 | /* update metric even if the upstream |
573 | * neighbor stays unchanged | |
574 | */ | |
575 | nexthop->mrib_metric_preference = | |
576 | pnc->distance; | |
577 | nexthop->mrib_route_metric = | |
578 | pnc->metric; | |
90ab4458 | 579 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 580 | zlog_debug( |
90ab4458 | 581 | "%s: (%pPA,%pPA)(%s) current nexthop %s is valid, skipping new path selection", |
e6e53006 | 582 | __func__, &src, |
90ab4458 | 583 | &grp_addr, |
584 | pim->vrf->name, | |
d62a17ae | 585 | nexthop->interface->name); |
a7f95c76 | 586 | return 1; |
d62a17ae | 587 | } |
588 | } | |
589 | } | |
590 | } | |
19967127 DS |
591 | |
592 | /* | |
593 | * Look up all interfaces and neighbors, | |
594 | * store for later usage | |
595 | */ | |
596 | for (nh_node = pnc->nexthop, i = 0; nh_node; | |
597 | nh_node = nh_node->next, i++) { | |
d3cc1e45 DS |
598 | ifps[i] = |
599 | if_lookup_by_index(nh_node->ifindex, pim->vrf->vrf_id); | |
19967127 | 600 | if (ifps[i]) { |
ae449dc5 | 601 | #if PIM_IPV == 4 |
9bb93fa0 DL |
602 | pim_addr nhaddr = nh_node->gate.ipv4; |
603 | #else | |
604 | pim_addr nhaddr = nh_node->gate.ipv6; | |
605 | #endif | |
ae5bcac0 | 606 | nbrs[i] = pim_neighbor_find(ifps[i], nhaddr, true); |
e6e53006 | 607 | if (nbrs[i] || pim_if_connected_to_source(ifps[i], src)) |
19967127 DS |
608 | num_nbrs++; |
609 | } | |
610 | } | |
4795fff7 | 611 | if (pim->ecmp_enable) { |
6288ebcf | 612 | struct prefix src_pfx; |
19967127 DS |
613 | uint32_t consider = pnc->nexthop_num; |
614 | ||
615 | if (neighbor_needed && num_nbrs < consider) | |
616 | consider = num_nbrs; | |
617 | ||
618 | if (consider == 0) | |
619 | return 0; | |
620 | ||
d62a17ae | 621 | // PIM ECMP flag is enable then choose ECMP path. |
e6e53006 | 622 | pim_addr_to_prefix(&src_pfx, src); |
6288ebcf | 623 | hash_val = pim_compute_ecmp_hash(&src_pfx, grp); |
19967127 | 624 | mod_val = hash_val % consider; |
d62a17ae | 625 | } |
626 | ||
627 | for (nh_node = pnc->nexthop; nh_node && (found == 0); | |
628 | nh_node = nh_node->next) { | |
629 | first_ifindex = nh_node->ifindex; | |
19967127 | 630 | ifp = ifps[nh_iter]; |
d62a17ae | 631 | if (!ifp) { |
90ab4458 | 632 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 633 | zlog_debug( |
90ab4458 | 634 | "%s %s: could not find interface for ifindex %d (address %pPA(%s))", |
e6e53006 | 635 | __FILE__, __func__, first_ifindex, &src, |
6288ebcf | 636 | pim->vrf->name); |
d62a17ae | 637 | if (nh_iter == mod_val) |
638 | mod_val++; // Select nexthpath | |
639 | nh_iter++; | |
640 | continue; | |
641 | } | |
31b66ed6 SP |
642 | |
643 | pim_ifp = ifp->info; | |
644 | ||
645 | if (!pim_ifp || !pim_ifp->pim_enable) { | |
90ab4458 | 646 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 647 | zlog_debug( |
31b66ed6 | 648 | "%s: pim not enabled on input interface %s(%s) (ifindex=%d, RPF for source %pPA)", |
15569c58 | 649 | __func__, ifp->name, pim->vrf->name, |
e6e53006 | 650 | first_ifindex, &src); |
d62a17ae | 651 | if (nh_iter == mod_val) |
652 | mod_val++; // Select nexthpath | |
653 | nh_iter++; | |
654 | continue; | |
655 | } | |
656 | ||
e6e53006 | 657 | if (neighbor_needed && !pim_if_connected_to_source(ifp, src)) { |
19967127 | 658 | nbr = nbrs[nh_iter]; |
d62a17ae | 659 | if (!nbr && !if_is_loopback(ifp)) { |
5cef40fc | 660 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 661 | zlog_debug( |
5cef40fc | 662 | "%s: pim nbr not found on input interface %s(%s)", |
15569c58 | 663 | __func__, ifp->name, |
5cef40fc | 664 | pim->vrf->name); |
d62a17ae | 665 | if (nh_iter == mod_val) |
666 | mod_val++; // Select nexthpath | |
667 | nh_iter++; | |
668 | continue; | |
669 | } | |
670 | } | |
671 | ||
672 | if (nh_iter == mod_val) { | |
673 | nexthop->interface = ifp; | |
90ab4458 | 674 | #if PIM_IPV == 4 |
dac86a0a | 675 | nexthop->mrib_nexthop_addr = nh_node->gate.ipv4; |
90ab4458 | 676 | #else |
dac86a0a | 677 | nexthop->mrib_nexthop_addr = nh_node->gate.ipv6; |
90ab4458 | 678 | #endif |
d62a17ae | 679 | nexthop->mrib_metric_preference = pnc->distance; |
680 | nexthop->mrib_route_metric = pnc->metric; | |
e6e53006 | 681 | nexthop->last_lookup = src; |
d62a17ae | 682 | nexthop->last_lookup_time = pim_time_monotonic_usec(); |
683 | nexthop->nbr = nbr; | |
684 | found = 1; | |
90ab4458 | 685 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 686 | zlog_debug( |
90ab4458 | 687 | "%s: (%pPA,%pPA)(%s) selected nhop interface %s addr %pPAs mod_val %u iter %d ecmp %d", |
e6e53006 | 688 | __func__, &src, &grp_addr, |
90ab4458 | 689 | pim->vrf->name, ifp->name, &nh_addr, |
690 | mod_val, nh_iter, pim->ecmp_enable); | |
d62a17ae | 691 | } |
692 | nh_iter++; | |
693 | } | |
694 | ||
695 | if (found) | |
cb9c7c50 | 696 | return 1; |
d62a17ae | 697 | else |
cb9c7c50 | 698 | return 0; |
633988a7 CS |
699 | } |
700 | ||
d62a17ae | 701 | /* This API is used to parse Registered address nexthop update coming from Zebra |
702 | */ | |
121f9dee | 703 | int pim_parse_nexthop_update(ZAPI_CALLBACK_ARGS) |
1bc98276 | 704 | { |
d62a17ae | 705 | struct nexthop *nexthop; |
706 | struct nexthop *nhlist_head = NULL; | |
707 | struct nexthop *nhlist_tail = NULL; | |
d62a17ae | 708 | int i; |
709 | struct pim_rpf rpf; | |
710 | struct pim_nexthop_cache *pnc = NULL; | |
d62a17ae | 711 | struct interface *ifp = NULL; |
cf663ceb | 712 | struct vrf *vrf = vrf_lookup_by_id(vrf_id); |
819f099b | 713 | struct pim_instance *pim; |
4a749e2c | 714 | struct zapi_route nhr; |
06e4e901 | 715 | struct prefix match; |
819f099b DS |
716 | |
717 | if (!vrf) | |
718 | return 0; | |
719 | pim = vrf->info; | |
d62a17ae | 720 | |
06e4e901 | 721 | if (!zapi_nexthop_update_decode(zclient->ibuf, &match, &nhr)) { |
6c83dded QY |
722 | zlog_err("%s: Decode of nexthop update from zebra failed", |
723 | __func__); | |
7d30a959 DS |
724 | return 0; |
725 | } | |
d62a17ae | 726 | |
5903e49c DL |
727 | rpf.rpf_addr = pim_addr_from_prefix(&match); |
728 | pnc = pim_nexthop_cache_find(pim, &rpf); | |
729 | if (!pnc) { | |
730 | if (PIM_DEBUG_PIM_NHT) | |
731 | zlog_debug( | |
732 | "%s: Skipping NHT update, addr %pPA is not in local cached DB.", | |
733 | __func__, &rpf.rpf_addr); | |
d62a17ae | 734 | return 0; |
735 | } | |
736 | ||
737 | pnc->last_update = pim_time_monotonic_usec(); | |
d62a17ae | 738 | |
4a749e2c | 739 | if (nhr.nexthop_num) { |
3d8814f8 | 740 | pnc->nexthop_num = 0; |
d62a17ae | 741 | |
4a749e2c DS |
742 | for (i = 0; i < nhr.nexthop_num; i++) { |
743 | nexthop = nexthop_from_zapi_nexthop(&nhr.nexthops[i]); | |
d62a17ae | 744 | switch (nexthop->type) { |
66f5152f MB |
745 | case NEXTHOP_TYPE_IFINDEX: |
746 | /* | |
747 | * Connected route (i.e. no nexthop), use | |
748 | * RPF address from nexthop cache (i.e. | |
749 | * destination) as PIM nexthop. | |
750 | */ | |
90ab4458 | 751 | #if PIM_IPV == 4 |
56c1568b | 752 | nexthop->type = NEXTHOP_TYPE_IPV4_IFINDEX; |
6288ebcf | 753 | nexthop->gate.ipv4 = pnc->rpf.rpf_addr; |
90ab4458 | 754 | #else |
755 | nexthop->type = NEXTHOP_TYPE_IPV6_IFINDEX; | |
6288ebcf | 756 | nexthop->gate.ipv6 = pnc->rpf.rpf_addr; |
90ab4458 | 757 | #endif |
66f5152f | 758 | break; |
c13a8235 DL |
759 | #if PIM_IPV == 4 |
760 | /* RFC5549 IPv4-over-IPv6 nexthop handling: | |
761 | * if we get an IPv6 nexthop in IPv4 PIM, hunt down a | |
762 | * PIM neighbor and use that instead. | |
763 | */ | |
764 | case NEXTHOP_TYPE_IPV6_IFINDEX: { | |
765 | struct interface *ifp1 = NULL; | |
766 | struct pim_neighbor *nbr = NULL; | |
767 | ||
d62a17ae | 768 | ifp1 = if_lookup_by_index(nexthop->ifindex, |
d3cc1e45 | 769 | pim->vrf->vrf_id); |
85948e7b DS |
770 | |
771 | if (!ifp1) | |
772 | nbr = NULL; | |
773 | else | |
c13a8235 DL |
774 | /* FIXME: should really use nbr's |
775 | * secondary address list here | |
776 | */ | |
85948e7b | 777 | nbr = pim_neighbor_find_if(ifp1); |
c13a8235 | 778 | |
d62a17ae | 779 | /* Overwrite with Nbr address as NH addr */ |
5cef40fc | 780 | if (nbr) |
d62a17ae | 781 | nexthop->gate.ipv4 = nbr->source_addr; |
c13a8235 | 782 | else |
d62a17ae | 783 | // Mark nexthop address to 0 until PIM |
784 | // Nbr is resolved. | |
90ab4458 | 785 | nexthop->gate.ipv4 = PIMADDR_ANY; |
c13a8235 DL |
786 | |
787 | break; | |
788 | } | |
90ab4458 | 789 | #else |
c13a8235 | 790 | case NEXTHOP_TYPE_IPV6_IFINDEX: |
90ab4458 | 791 | #endif |
c13a8235 DL |
792 | case NEXTHOP_TYPE_IPV6: |
793 | case NEXTHOP_TYPE_IPV4: | |
794 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
795 | case NEXTHOP_TYPE_BLACKHOLE: | |
796 | /* nothing to do for the other nexthop types */ | |
d62a17ae | 797 | break; |
798 | } | |
799 | ||
d3cc1e45 DS |
800 | ifp = if_lookup_by_index(nexthop->ifindex, |
801 | pim->vrf->vrf_id); | |
d62a17ae | 802 | if (!ifp) { |
5cef40fc | 803 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 804 | char buf[NEXTHOP_STRLEN]; |
805 | zlog_debug( | |
5cef40fc | 806 | "%s: could not find interface for ifindex %d(%s) (addr %s)", |
15569c58 | 807 | __func__, nexthop->ifindex, |
5cef40fc | 808 | pim->vrf->name, |
d62a17ae | 809 | nexthop2str(nexthop, buf, |
810 | sizeof(buf))); | |
811 | } | |
812 | nexthop_free(nexthop); | |
813 | continue; | |
814 | } | |
815 | ||
f11bc925 DL |
816 | if (PIM_DEBUG_PIM_NHT) { |
817 | #if PIM_IPV == 4 | |
818 | pim_addr nhaddr = nexthop->gate.ipv4; | |
819 | #else | |
820 | pim_addr nhaddr = nexthop->gate.ipv6; | |
821 | #endif | |
1b5f8a1a | 822 | zlog_debug( |
f11bc925 | 823 | "%s: NHT addr %pFX(%s) %d-nhop via %pPA(%s) type %d distance:%u metric:%u ", |
06e4e901 | 824 | __func__, &match, pim->vrf->name, i + 1, |
f11bc925 DL |
825 | &nhaddr, ifp->name, nexthop->type, |
826 | nhr.distance, nhr.metric); | |
827 | } | |
1b5f8a1a | 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)", |
15569c58 | 843 | __func__, 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 | } | |
3d8814f8 | 858 | |
859 | // Keep track of all nexthops, even PIM-disabled ones. | |
d62a17ae | 860 | pnc->nexthop_num++; |
861 | } | |
862 | /* Reset existing pnc->nexthop before assigning new list */ | |
863 | nexthops_free(pnc->nexthop); | |
864 | pnc->nexthop = nhlist_head; | |
865 | if (pnc->nexthop_num) { | |
866 | pnc->flags |= PIM_NEXTHOP_VALID; | |
4a749e2c DS |
867 | pnc->distance = nhr.distance; |
868 | pnc->metric = nhr.metric; | |
d62a17ae | 869 | } |
870 | } else { | |
871 | pnc->flags &= ~PIM_NEXTHOP_VALID; | |
4a749e2c | 872 | pnc->nexthop_num = nhr.nexthop_num; |
d62a17ae | 873 | nexthops_free(pnc->nexthop); |
874 | pnc->nexthop = NULL; | |
875 | } | |
2cb7234f | 876 | SET_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED); |
d62a17ae | 877 | |
2dbe669b | 878 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 879 | zlog_debug( |
2dbe669b | 880 | "%s: NHT Update for %pFX(%s) num_nh %d num_pim_nh %d vrf:%u up %ld rp %d", |
06e4e901 | 881 | __func__, &match, pim->vrf->name, nhr.nexthop_num, |
15569c58 DA |
882 | pnc->nexthop_num, vrf_id, pnc->upstream_hash->count, |
883 | listcount(pnc->rp_list)); | |
d62a17ae | 884 | |
bfc92019 | 885 | pim_rpf_set_refresh_time(pim); |
d62a17ae | 886 | |
887 | if (listcount(pnc->rp_list)) | |
25b787a2 | 888 | pim_update_rp_nh(pim, pnc); |
7c591950 | 889 | if (pnc->upstream_hash->count) |
cf663ceb | 890 | pim_update_upstream_nh(pim, pnc); |
d62a17ae | 891 | |
892 | return 0; | |
1bc98276 | 893 | } |
633988a7 | 894 | |
25b787a2 | 895 | int pim_ecmp_nexthop_lookup(struct pim_instance *pim, |
e6e53006 | 896 | struct pim_nexthop *nexthop, pim_addr src, |
b938537b | 897 | struct prefix *grp, int neighbor_needed) |
633988a7 | 898 | { |
43763b11 | 899 | struct pim_nexthop_cache *pnc; |
75700af6 DS |
900 | struct pim_zlookup_nexthop nexthop_tab[router->multipath]; |
901 | struct pim_neighbor *nbrs[router->multipath], *nbr = NULL; | |
43763b11 | 902 | struct pim_rpf rpf; |
d62a17ae | 903 | int num_ifindex; |
75700af6 | 904 | struct interface *ifps[router->multipath], *ifp; |
d62a17ae | 905 | int first_ifindex; |
906 | int found = 0; | |
907 | uint8_t i = 0; | |
908 | uint32_t hash_val = 0, mod_val = 0; | |
19967127 | 909 | uint32_t num_nbrs = 0; |
31b66ed6 | 910 | struct pim_interface *pim_ifp; |
d62a17ae | 911 | |
6d733f0d | 912 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
90ab4458 | 913 | zlog_debug("%s: Looking up: %pPA(%s), last lookup time: %lld", |
e6e53006 | 914 | __func__, &src, pim->vrf->name, |
d62a17ae | 915 | nexthop->last_lookup_time); |
d62a17ae | 916 | |
e6e53006 | 917 | rpf.rpf_addr = src; |
43763b11 DS |
918 | |
919 | pnc = pim_nexthop_cache_find(pim, &rpf); | |
2cb7234f DS |
920 | if (pnc) { |
921 | if (CHECK_FLAG(pnc->flags, PIM_NEXTHOP_ANSWER_RECEIVED)) | |
922 | return pim_ecmp_nexthop_search(pim, pnc, nexthop, src, grp, | |
923 | neighbor_needed); | |
924 | } | |
43763b11 | 925 | |
d62a17ae | 926 | memset(nexthop_tab, 0, |
75700af6 DS |
927 | sizeof(struct pim_zlookup_nexthop) * router->multipath); |
928 | num_ifindex = | |
6288ebcf | 929 | zclient_lookup_nexthop(pim, nexthop_tab, router->multipath, src, |
930 | PIM_NEXTHOP_LOOKUP_MAX); | |
d62a17ae | 931 | if (num_ifindex < 1) { |
b938537b | 932 | if (PIM_DEBUG_PIM_NHT) |
209a5679 | 933 | zlog_warn( |
90ab4458 | 934 | "%s: could not find nexthop ifindex for address %pPA(%s)", |
e6e53006 | 935 | __func__, &src, pim->vrf->name); |
cb9c7c50 | 936 | return 0; |
d62a17ae | 937 | } |
938 | ||
431f21d3 A |
939 | memset(&nbrs, 0, sizeof(nbrs)); |
940 | memset(&ifps, 0, sizeof(ifps)); | |
941 | ||
19967127 DS |
942 | /* |
943 | * Look up all interfaces and neighbors, | |
944 | * store for later usage | |
945 | */ | |
946 | for (i = 0; i < num_ifindex; i++) { | |
947 | ifps[i] = if_lookup_by_index(nexthop_tab[i].ifindex, | |
d3cc1e45 | 948 | pim->vrf->vrf_id); |
19967127 | 949 | if (ifps[i]) { |
dac86a0a | 950 | nbrs[i] = pim_neighbor_find( |
ae5bcac0 SP |
951 | ifps[i], nexthop_tab[i].nexthop_addr, true); |
952 | ||
e6e53006 | 953 | if (nbrs[i] || pim_if_connected_to_source(ifps[i], src)) |
19967127 DS |
954 | num_nbrs++; |
955 | } | |
956 | } | |
957 | ||
d62a17ae | 958 | // If PIM ECMP enable then choose ECMP path. |
4795fff7 | 959 | if (pim->ecmp_enable) { |
6288ebcf | 960 | struct prefix src_pfx; |
19967127 DS |
961 | uint32_t consider = num_ifindex; |
962 | ||
963 | if (neighbor_needed && num_nbrs < consider) | |
964 | consider = num_nbrs; | |
965 | ||
966 | if (consider == 0) | |
967 | return 0; | |
968 | ||
e6e53006 | 969 | pim_addr_to_prefix(&src_pfx, src); |
6288ebcf | 970 | hash_val = pim_compute_ecmp_hash(&src_pfx, grp); |
19967127 | 971 | mod_val = hash_val % consider; |
5cef40fc | 972 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
15569c58 DA |
973 | zlog_debug("%s: hash_val %u mod_val %u", __func__, |
974 | hash_val, mod_val); | |
d62a17ae | 975 | } |
976 | ||
19967127 | 977 | i = 0; |
d62a17ae | 978 | while (!found && (i < num_ifindex)) { |
979 | first_ifindex = nexthop_tab[i].ifindex; | |
980 | ||
19967127 | 981 | ifp = ifps[i]; |
d62a17ae | 982 | if (!ifp) { |
b938537b | 983 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 984 | zlog_debug( |
90ab4458 | 985 | "%s %s: could not find interface for ifindex %d (address %pPA(%s))", |
e6e53006 | 986 | __FILE__, __func__, first_ifindex, &src, |
6288ebcf | 987 | pim->vrf->name); |
d62a17ae | 988 | if (i == mod_val) |
989 | mod_val++; | |
990 | i++; | |
991 | continue; | |
992 | } | |
993 | ||
31b66ed6 SP |
994 | pim_ifp = ifp->info; |
995 | ||
996 | if (!pim_ifp || !pim_ifp->pim_enable) { | |
b938537b | 997 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 998 | zlog_debug( |
31b66ed6 | 999 | "%s: pim not enabled on input interface %s(%s) (ifindex=%d, RPF for source %pPA)", |
15569c58 | 1000 | __func__, ifp->name, pim->vrf->name, |
e6e53006 | 1001 | first_ifindex, &src); |
d62a17ae | 1002 | if (i == mod_val) |
1003 | mod_val++; | |
1004 | i++; | |
1005 | continue; | |
1006 | } | |
e6e53006 | 1007 | if (neighbor_needed && !pim_if_connected_to_source(ifp, src)) { |
19967127 | 1008 | nbr = nbrs[i]; |
5cef40fc DS |
1009 | if (PIM_DEBUG_PIM_NHT_DETAIL) |
1010 | zlog_debug("ifp name: %s(%s), pim nbr: %p", | |
1011 | ifp->name, pim->vrf->name, nbr); | |
d62a17ae | 1012 | if (!nbr && !if_is_loopback(ifp)) { |
1013 | if (i == mod_val) | |
1014 | mod_val++; | |
b938537b | 1015 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 1016 | zlog_debug( |
dac86a0a | 1017 | "%s: NBR (%pPA) not found on input interface %s(%s) (RPF for source %pPA)", |
185754fe DL |
1018 | __func__, |
1019 | &nexthop_tab[i].nexthop_addr, | |
e6e53006 | 1020 | ifp->name, pim->vrf->name, |
1021 | &src); | |
185754fe | 1022 | i++; |
d62a17ae | 1023 | continue; |
1024 | } | |
1025 | } | |
1026 | ||
1027 | if (i == mod_val) { | |
dac86a0a | 1028 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 1029 | zlog_debug( |
dac86a0a | 1030 | "%s: found nhop %pPA for addr %pPA interface %s(%s) metric %d dist %d", |
1031 | __func__, &nexthop_tab[i].nexthop_addr, | |
e6e53006 | 1032 | &src, ifp->name, pim->vrf->name, |
d62a17ae | 1033 | nexthop_tab[i].route_metric, |
1034 | nexthop_tab[i].protocol_distance); | |
1a81b790 | 1035 | /* update nexthop data */ |
d62a17ae | 1036 | nexthop->interface = ifp; |
1037 | nexthop->mrib_nexthop_addr = | |
1038 | nexthop_tab[i].nexthop_addr; | |
1039 | nexthop->mrib_metric_preference = | |
1040 | nexthop_tab[i].protocol_distance; | |
1041 | nexthop->mrib_route_metric = | |
1042 | nexthop_tab[i].route_metric; | |
e6e53006 | 1043 | nexthop->last_lookup = src; |
d62a17ae | 1044 | nexthop->last_lookup_time = pim_time_monotonic_usec(); |
1045 | nexthop->nbr = nbr; | |
1046 | found = 1; | |
1047 | } | |
1048 | i++; | |
1049 | } | |
cb9c7c50 | 1050 | |
d62a17ae | 1051 | if (found) |
cb9c7c50 | 1052 | return 1; |
d62a17ae | 1053 | else |
cb9c7c50 | 1054 | return 0; |
633988a7 | 1055 | } |
815c33c9 | 1056 | |
e6e53006 | 1057 | int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim, pim_addr src, |
6288ebcf | 1058 | struct prefix *grp) |
815c33c9 | 1059 | { |
8a5134aa | 1060 | struct pim_nexthop nhop; |
d62a17ae | 1061 | int vif_index; |
8a5134aa | 1062 | ifindex_t ifindex; |
2ccc414b DS |
1063 | |
1064 | memset(&nhop, 0, sizeof(nhop)); | |
3d68661d | 1065 | if (!pim_ecmp_nexthop_lookup(pim, &nhop, src, grp, 1)) { |
b938537b | 1066 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 1067 | zlog_debug( |
90ab4458 | 1068 | "%s: could not find nexthop ifindex for address %pPA(%s)", |
e6e53006 | 1069 | __func__, &src, pim->vrf->name); |
d62a17ae | 1070 | return -1; |
1071 | } | |
1072 | ||
8a5134aa | 1073 | ifindex = nhop.interface->ifindex; |
b938537b | 1074 | if (PIM_DEBUG_PIM_NHT) |
d62a17ae | 1075 | zlog_debug( |
90ab4458 | 1076 | "%s: found nexthop ifindex=%d (interface %s(%s)) for address %pPA", |
d3cc1e45 DS |
1077 | __func__, ifindex, |
1078 | ifindex2ifname(ifindex, pim->vrf->vrf_id), | |
e6e53006 | 1079 | pim->vrf->name, &src); |
d62a17ae | 1080 | |
8a5134aa | 1081 | vif_index = pim_if_find_vifindex_by_ifindex(pim, ifindex); |
d62a17ae | 1082 | |
1083 | if (vif_index < 0) { | |
5cef40fc | 1084 | if (PIM_DEBUG_PIM_NHT) { |
d62a17ae | 1085 | zlog_debug( |
90ab4458 | 1086 | "%s: low vif_index=%d(%s) < 1 nexthop for address %pPA", |
e6e53006 | 1087 | __func__, vif_index, pim->vrf->name, &src); |
d62a17ae | 1088 | } |
1089 | return -2; | |
1090 | } | |
1091 | ||
1092 | return vif_index; | |
815c33c9 | 1093 | } |