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ad28e79a SW |
1 | /* Zebra Nexthop Group Code. |
2 | * Copyright (C) 2019 Cumulus Networks, Inc. | |
3 | * Donald Sharp | |
4 | * Stephen Worley | |
5 | * | |
6 | * This file is part of FRR. | |
7 | * | |
8 | * FRR is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2, or (at your option) any | |
11 | * later version. | |
12 | * | |
13 | * FRR is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with FRR; see the file COPYING. If not, write to the Free | |
20 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
21 | * 02111-1307, USA. | |
22 | */ | |
23 | #include <zebra.h> | |
24 | ||
25 | #include "lib/nexthop.h" | |
50d89650 | 26 | #include "lib/nexthop_group_private.h" |
ad28e79a | 27 | #include "lib/routemap.h" |
b43434ad | 28 | #include "lib/mpls.h" |
69171da2 | 29 | #include "lib/jhash.h" |
ad28e79a SW |
30 | |
31 | #include "zebra/connected.h" | |
32 | #include "zebra/debug.h" | |
33 | #include "zebra/zebra_router.h" | |
34 | #include "zebra/zebra_nhg.h" | |
35 | #include "zebra/zebra_rnh.h" | |
36 | #include "zebra/zebra_routemap.h" | |
37 | #include "zebra/rt.h" | |
38 | ||
4e49c8b8 DS |
39 | |
40 | static void *zebra_nhg_alloc(void *arg) | |
41 | { | |
42 | struct nhg_hash_entry *nhe; | |
43 | struct nhg_hash_entry *copy = arg; | |
44 | ||
45 | nhe = XMALLOC(MTYPE_TMP, sizeof(struct nhg_hash_entry)); | |
46 | ||
47 | nhe->vrf_id = copy->vrf_id; | |
48 | nhe->afi = copy->afi; | |
49 | nhe->refcnt = 0; | |
50 | nhe->dplane_ref = zebra_router_get_next_sequence(); | |
51 | nhe->nhg.nexthop = NULL; | |
52 | ||
53 | nexthop_group_copy(&nhe->nhg, ©->nhg); | |
54 | ||
55 | nhe->refcnt = 1; | |
56 | ||
57 | return nhe; | |
58 | } | |
59 | ||
60 | static uint32_t zebra_nhg_hash_key_nexthop_group(struct nexthop_group *nhg) | |
61 | { | |
62 | struct nexthop *nh; | |
63 | uint32_t i; | |
64 | uint32_t key = 0; | |
65 | ||
66 | /* | |
67 | * We are not interested in hashing over any recursively | |
68 | * resolved nexthops | |
69 | */ | |
70 | for (nh = nhg->nexthop; nh; nh = nh->next) { | |
71 | key = jhash_2words(nh->vrf_id, nh->nh_label_type, key); | |
72 | /* gate and blackhole are together in a union */ | |
73 | key = jhash(&nh->gate, sizeof(nh->gate), key); | |
74 | key = jhash(&nh->src, sizeof(nh->src), key); | |
75 | key = jhash(&nh->rmap_src, sizeof(nh->rmap_src), key); | |
76 | if (nh->nh_label) { | |
77 | for (i = 0; i < nh->nh_label->num_labels; i++) | |
78 | key = jhash_1word(nh->nh_label->label[i], key); | |
79 | } | |
80 | switch (nh->type) { | |
81 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
82 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
83 | case NEXTHOP_TYPE_IFINDEX: | |
84 | key = jhash_1word(nh->ifindex, key); | |
85 | break; | |
86 | case NEXTHOP_TYPE_BLACKHOLE: | |
87 | case NEXTHOP_TYPE_IPV4: | |
88 | case NEXTHOP_TYPE_IPV6: | |
89 | break; | |
90 | } | |
91 | } | |
92 | return key; | |
93 | } | |
94 | ||
95 | uint32_t zebra_nhg_hash_key(const void *arg) | |
96 | { | |
97 | const struct nhg_hash_entry *nhe = arg; | |
98 | int key = 0x5a351234; | |
99 | ||
100 | key = jhash_2words(nhe->vrf_id, nhe->afi, key); | |
101 | ||
102 | return jhash_1word(zebra_nhg_hash_key_nexthop_group(&nhe->nhg), key); | |
103 | } | |
104 | ||
a95b8020 SW |
105 | uint32_t zebra_nhg_id_key(const void *arg) |
106 | { | |
107 | const struct nhg_hash_entry *nhe = arg; | |
108 | ||
109 | return nhe->id; | |
110 | } | |
111 | ||
112 | bool zebra_nhg_id_equal(const void *arg1, const void *arg2) | |
113 | { | |
114 | const struct nhg_hash_entry *nhe1 = arg1; | |
115 | const struct nhg_hash_entry *nhe2 = arg2; | |
116 | ||
117 | return (nhe1->id == nhe2->id); | |
118 | } | |
119 | ||
4e49c8b8 DS |
120 | bool zebra_nhg_hash_equal(const void *arg1, const void *arg2) |
121 | { | |
122 | const struct nhg_hash_entry *nhe1 = arg1; | |
123 | const struct nhg_hash_entry *nhe2 = arg2; | |
124 | struct nexthop *nh1, *nh2; | |
125 | uint32_t nh_count = 0; | |
126 | ||
127 | if (nhe1->vrf_id != nhe2->vrf_id) | |
128 | return false; | |
129 | ||
130 | if (nhe1->afi != nhe2->afi) | |
131 | return false; | |
132 | ||
133 | /* | |
134 | * Again we are not interested in looking at any recursively | |
135 | * resolved nexthops. Top level only | |
136 | */ | |
137 | for (nh1 = nhe1->nhg.nexthop; nh1; nh1 = nh1->next) { | |
138 | uint32_t inner_nh_count = 0; | |
139 | for (nh2 = nhe2->nhg.nexthop; nh2; nh2 = nh2->next) { | |
140 | if (inner_nh_count == nh_count) { | |
141 | break; | |
142 | } | |
143 | inner_nh_count++; | |
144 | } | |
145 | ||
146 | if (!nexthop_same(nh1, nh2)) | |
147 | return false; | |
148 | ||
149 | nh_count++; | |
150 | } | |
151 | ||
152 | return true; | |
153 | } | |
154 | ||
a95b8020 SW |
155 | /** |
156 | * Helper function for lookup and get() | |
157 | * since we are using two different tables. | |
158 | * | |
159 | * Avoiding code duplication hopefully. | |
160 | */ | |
161 | static void zebra_nhg_lookup_get(struct hash *hash_table, | |
162 | struct nhg_hash_entry *lookup) | |
4e49c8b8 | 163 | { |
a95b8020 | 164 | struct nhg_hash_entry *nhe; |
4e49c8b8 | 165 | |
a95b8020 | 166 | nhe = hash_lookup(hash_table, lookup); |
4e49c8b8 | 167 | |
4e49c8b8 | 168 | if (!nhe) |
a95b8020 | 169 | nhe = hash_get(hash_table, lookup, zebra_nhg_alloc); |
4e49c8b8 DS |
170 | else |
171 | nhe->refcnt++; | |
172 | ||
173 | //re->ng = nhe->nhg; | |
174 | ||
175 | return; | |
176 | } | |
177 | ||
a95b8020 SW |
178 | void zebra_nhg_find_id(uint32_t id, struct nexthop_group *nhg) |
179 | { | |
180 | struct nhg_hash_entry lookup = {0}; | |
181 | ||
182 | lookup.nhg = *nhg; | |
183 | ||
184 | zebra_nhg_lookup_get(zrouter.nhgs_id, &lookup); | |
185 | } | |
186 | ||
187 | void zebra_nhg_find(afi_t afi, struct nexthop_group *nhg, | |
188 | struct route_entry *re) | |
189 | { | |
190 | struct nhg_hash_entry lookup; | |
191 | ||
192 | memset(&lookup, 0, sizeof(lookup)); | |
193 | lookup.vrf_id = re->vrf_id; | |
194 | lookup.afi = afi; | |
195 | lookup.nhg = *nhg; | |
196 | ||
197 | zebra_nhg_lookup_get(zrouter.nhgs, &lookup); | |
198 | } | |
199 | ||
4e49c8b8 DS |
200 | void zebra_nhg_release(afi_t afi, struct route_entry *re) |
201 | { | |
202 | struct nhg_hash_entry lookup, *nhe; | |
203 | ||
204 | lookup.vrf_id = re->vrf_id; | |
205 | lookup.afi = afi; | |
6b468511 | 206 | lookup.nhg = *re->ng; |
4e49c8b8 DS |
207 | |
208 | nhe = hash_lookup(zrouter.nhgs, &lookup); | |
209 | nhe->refcnt--; | |
210 | ||
211 | if (nhe->refcnt == 0) | |
212 | hash_release(zrouter.nhgs, nhe); | |
213 | // re->ng = NULL; | |
214 | } | |
215 | ||
ad28e79a SW |
216 | static void nexthop_set_resolved(afi_t afi, const struct nexthop *newhop, |
217 | struct nexthop *nexthop) | |
218 | { | |
219 | struct nexthop *resolved_hop; | |
b43434ad SW |
220 | uint8_t num_labels = 0; |
221 | mpls_label_t labels[MPLS_MAX_LABELS]; | |
222 | enum lsp_types_t label_type = ZEBRA_LSP_NONE; | |
223 | int i = 0; | |
ad28e79a SW |
224 | |
225 | resolved_hop = nexthop_new(); | |
226 | SET_FLAG(resolved_hop->flags, NEXTHOP_FLAG_ACTIVE); | |
227 | ||
228 | resolved_hop->vrf_id = nexthop->vrf_id; | |
229 | switch (newhop->type) { | |
230 | case NEXTHOP_TYPE_IPV4: | |
231 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
232 | /* If the resolving route specifies a gateway, use it */ | |
233 | resolved_hop->type = newhop->type; | |
234 | resolved_hop->gate.ipv4 = newhop->gate.ipv4; | |
235 | ||
236 | if (newhop->ifindex) { | |
237 | resolved_hop->type = NEXTHOP_TYPE_IPV4_IFINDEX; | |
238 | resolved_hop->ifindex = newhop->ifindex; | |
239 | } | |
240 | break; | |
241 | case NEXTHOP_TYPE_IPV6: | |
242 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
243 | resolved_hop->type = newhop->type; | |
244 | resolved_hop->gate.ipv6 = newhop->gate.ipv6; | |
245 | ||
246 | if (newhop->ifindex) { | |
247 | resolved_hop->type = NEXTHOP_TYPE_IPV6_IFINDEX; | |
248 | resolved_hop->ifindex = newhop->ifindex; | |
249 | } | |
250 | break; | |
251 | case NEXTHOP_TYPE_IFINDEX: | |
252 | /* If the resolving route is an interface route, | |
253 | * it means the gateway we are looking up is connected | |
254 | * to that interface. (The actual network is _not_ onlink). | |
255 | * Therefore, the resolved route should have the original | |
256 | * gateway as nexthop as it is directly connected. | |
257 | * | |
258 | * On Linux, we have to set the onlink netlink flag because | |
259 | * otherwise, the kernel won't accept the route. | |
260 | */ | |
261 | resolved_hop->flags |= NEXTHOP_FLAG_ONLINK; | |
262 | if (afi == AFI_IP) { | |
263 | resolved_hop->type = NEXTHOP_TYPE_IPV4_IFINDEX; | |
264 | resolved_hop->gate.ipv4 = nexthop->gate.ipv4; | |
265 | } else if (afi == AFI_IP6) { | |
266 | resolved_hop->type = NEXTHOP_TYPE_IPV6_IFINDEX; | |
267 | resolved_hop->gate.ipv6 = nexthop->gate.ipv6; | |
268 | } | |
269 | resolved_hop->ifindex = newhop->ifindex; | |
270 | break; | |
271 | case NEXTHOP_TYPE_BLACKHOLE: | |
272 | resolved_hop->type = NEXTHOP_TYPE_BLACKHOLE; | |
2dc359a6 | 273 | resolved_hop->bh_type = newhop->bh_type; |
ad28e79a SW |
274 | break; |
275 | } | |
276 | ||
277 | if (newhop->flags & NEXTHOP_FLAG_ONLINK) | |
278 | resolved_hop->flags |= NEXTHOP_FLAG_ONLINK; | |
279 | ||
b43434ad SW |
280 | /* Copy labels of the resolved route and the parent resolving to it */ |
281 | if (newhop->nh_label) { | |
282 | for (i = 0; i < newhop->nh_label->num_labels; i++) | |
283 | labels[num_labels++] = newhop->nh_label->label[i]; | |
284 | label_type = newhop->nh_label_type; | |
285 | } | |
286 | ||
287 | if (nexthop->nh_label) { | |
288 | for (i = 0; i < nexthop->nh_label->num_labels; i++) | |
289 | labels[num_labels++] = nexthop->nh_label->label[i]; | |
290 | ||
291 | /* If the parent has labels, use its type */ | |
292 | label_type = nexthop->nh_label_type; | |
293 | } | |
294 | ||
295 | if (num_labels) | |
296 | nexthop_add_labels(resolved_hop, label_type, num_labels, | |
297 | labels); | |
ad28e79a SW |
298 | |
299 | resolved_hop->rparent = nexthop; | |
50d89650 | 300 | _nexthop_add(&nexthop->resolved, resolved_hop); |
ad28e79a SW |
301 | } |
302 | ||
6913cb1b SW |
303 | /* Checks if nexthop we are trying to resolve to is valid */ |
304 | static bool nexthop_valid_resolve(const struct nexthop *nexthop, | |
305 | const struct nexthop *resolved) | |
306 | { | |
307 | /* Can't resolve to a recursive nexthop */ | |
308 | if (CHECK_FLAG(resolved->flags, NEXTHOP_FLAG_RECURSIVE)) | |
309 | return false; | |
310 | ||
311 | switch (nexthop->type) { | |
312 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
313 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
314 | /* If the nexthop we are resolving to does not match the | |
315 | * ifindex for the nexthop the route wanted, its not valid. | |
316 | */ | |
317 | if (nexthop->ifindex != resolved->ifindex) | |
318 | return false; | |
319 | break; | |
320 | case NEXTHOP_TYPE_IPV4: | |
321 | case NEXTHOP_TYPE_IPV6: | |
322 | case NEXTHOP_TYPE_IFINDEX: | |
323 | case NEXTHOP_TYPE_BLACKHOLE: | |
324 | break; | |
325 | } | |
326 | ||
327 | return true; | |
328 | } | |
329 | ||
ad28e79a SW |
330 | /* |
331 | * Given a nexthop we need to properly recursively resolve | |
332 | * the route. As such, do a table lookup to find and match | |
333 | * if at all possible. Set the nexthop->ifindex as appropriate | |
334 | */ | |
335 | static int nexthop_active(afi_t afi, struct route_entry *re, | |
336 | struct nexthop *nexthop, struct route_node *top) | |
337 | { | |
338 | struct prefix p; | |
339 | struct route_table *table; | |
340 | struct route_node *rn; | |
341 | struct route_entry *match = NULL; | |
342 | int resolved; | |
343 | struct nexthop *newhop; | |
344 | struct interface *ifp; | |
345 | rib_dest_t *dest; | |
5a0bdc78 | 346 | struct zebra_vrf *zvrf; |
ad28e79a SW |
347 | |
348 | if ((nexthop->type == NEXTHOP_TYPE_IPV4) | |
349 | || nexthop->type == NEXTHOP_TYPE_IPV6) | |
350 | nexthop->ifindex = 0; | |
351 | ||
352 | UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE); | |
353 | nexthops_free(nexthop->resolved); | |
354 | nexthop->resolved = NULL; | |
355 | re->nexthop_mtu = 0; | |
356 | ||
357 | /* | |
a8c427ee | 358 | * If the kernel has sent us a NEW route, then |
ad28e79a | 359 | * by golly gee whiz it's a good route. |
a8c427ee SW |
360 | * |
361 | * If its an already INSTALLED route we have already handled, then the | |
362 | * kernel route's nexthop might have became unreachable | |
363 | * and we have to handle that. | |
ad28e79a | 364 | */ |
a8c427ee SW |
365 | if (!CHECK_FLAG(re->status, ROUTE_ENTRY_INSTALLED) |
366 | && (re->type == ZEBRA_ROUTE_KERNEL | |
367 | || re->type == ZEBRA_ROUTE_SYSTEM)) | |
ad28e79a SW |
368 | return 1; |
369 | ||
370 | /* | |
371 | * Check to see if we should trust the passed in information | |
372 | * for UNNUMBERED interfaces as that we won't find the GW | |
373 | * address in the routing table. | |
374 | * This check should suffice to handle IPv4 or IPv6 routes | |
375 | * sourced from EVPN routes which are installed with the | |
376 | * next hop as the remote VTEP IP. | |
377 | */ | |
378 | if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ONLINK)) { | |
379 | ifp = if_lookup_by_index(nexthop->ifindex, nexthop->vrf_id); | |
380 | if (!ifp) { | |
381 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) | |
382 | zlog_debug( | |
383 | "\t%s: Onlink and interface: %u[%u] does not exist", | |
384 | __PRETTY_FUNCTION__, nexthop->ifindex, | |
385 | nexthop->vrf_id); | |
386 | return 0; | |
387 | } | |
388 | if (connected_is_unnumbered(ifp)) { | |
389 | if (if_is_operative(ifp)) | |
390 | return 1; | |
391 | else { | |
392 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) | |
393 | zlog_debug( | |
394 | "\t%s: Onlink and interface %s is not operative", | |
395 | __PRETTY_FUNCTION__, ifp->name); | |
396 | return 0; | |
397 | } | |
398 | } | |
399 | if (!if_is_operative(ifp)) { | |
400 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) | |
401 | zlog_debug( | |
402 | "\t%s: Interface %s is not unnumbered", | |
403 | __PRETTY_FUNCTION__, ifp->name); | |
404 | return 0; | |
405 | } | |
406 | } | |
407 | ||
408 | /* Make lookup prefix. */ | |
409 | memset(&p, 0, sizeof(struct prefix)); | |
410 | switch (afi) { | |
411 | case AFI_IP: | |
412 | p.family = AF_INET; | |
413 | p.prefixlen = IPV4_MAX_PREFIXLEN; | |
414 | p.u.prefix4 = nexthop->gate.ipv4; | |
415 | break; | |
416 | case AFI_IP6: | |
417 | p.family = AF_INET6; | |
418 | p.prefixlen = IPV6_MAX_PREFIXLEN; | |
419 | p.u.prefix6 = nexthop->gate.ipv6; | |
420 | break; | |
421 | default: | |
422 | assert(afi != AFI_IP && afi != AFI_IP6); | |
423 | break; | |
424 | } | |
425 | /* Lookup table. */ | |
426 | table = zebra_vrf_table(afi, SAFI_UNICAST, nexthop->vrf_id); | |
5a0bdc78 PG |
427 | /* get zvrf */ |
428 | zvrf = zebra_vrf_lookup_by_id(nexthop->vrf_id); | |
429 | if (!table || !zvrf) { | |
ad28e79a SW |
430 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) |
431 | zlog_debug("\t%s: Table not found", | |
432 | __PRETTY_FUNCTION__); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | rn = route_node_match(table, (struct prefix *)&p); | |
437 | while (rn) { | |
438 | route_unlock_node(rn); | |
439 | ||
440 | /* Lookup should halt if we've matched against ourselves ('top', | |
441 | * if specified) - i.e., we cannot have a nexthop NH1 is | |
442 | * resolved by a route NH1. The exception is if the route is a | |
443 | * host route. | |
444 | */ | |
445 | if (top && rn == top) | |
446 | if (((afi == AFI_IP) && (rn->p.prefixlen != 32)) | |
447 | || ((afi == AFI_IP6) && (rn->p.prefixlen != 128))) { | |
448 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) | |
449 | zlog_debug( | |
450 | "\t%s: Matched against ourself and prefix length is not max bit length", | |
451 | __PRETTY_FUNCTION__); | |
452 | return 0; | |
453 | } | |
454 | ||
455 | /* Pick up selected route. */ | |
456 | /* However, do not resolve over default route unless explicitly | |
457 | * allowed. */ | |
458 | if (is_default_prefix(&rn->p) | |
5a0bdc78 | 459 | && !rnh_resolve_via_default(zvrf, p.family)) { |
ad28e79a SW |
460 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) |
461 | zlog_debug( | |
462 | "\t:%s: Resolved against default route", | |
463 | __PRETTY_FUNCTION__); | |
464 | return 0; | |
465 | } | |
466 | ||
467 | dest = rib_dest_from_rnode(rn); | |
468 | if (dest && dest->selected_fib | |
469 | && !CHECK_FLAG(dest->selected_fib->status, | |
470 | ROUTE_ENTRY_REMOVED) | |
471 | && dest->selected_fib->type != ZEBRA_ROUTE_TABLE) | |
472 | match = dest->selected_fib; | |
473 | ||
474 | /* If there is no selected route or matched route is EGP, go up | |
475 | tree. */ | |
476 | if (!match) { | |
477 | do { | |
478 | rn = rn->parent; | |
479 | } while (rn && rn->info == NULL); | |
480 | if (rn) | |
481 | route_lock_node(rn); | |
482 | ||
483 | continue; | |
484 | } | |
485 | ||
486 | if (match->type == ZEBRA_ROUTE_CONNECT) { | |
487 | /* Directly point connected route. */ | |
6b468511 | 488 | newhop = match->ng->nexthop; |
ad28e79a SW |
489 | if (newhop) { |
490 | if (nexthop->type == NEXTHOP_TYPE_IPV4 | |
491 | || nexthop->type == NEXTHOP_TYPE_IPV6) | |
492 | nexthop->ifindex = newhop->ifindex; | |
493 | } | |
494 | return 1; | |
495 | } else if (CHECK_FLAG(re->flags, ZEBRA_FLAG_ALLOW_RECURSION)) { | |
496 | resolved = 0; | |
6b468511 | 497 | for (ALL_NEXTHOPS_PTR(match->ng, newhop)) { |
ad28e79a SW |
498 | if (!CHECK_FLAG(match->status, |
499 | ROUTE_ENTRY_INSTALLED)) | |
500 | continue; | |
6913cb1b | 501 | if (!nexthop_valid_resolve(nexthop, newhop)) |
ad28e79a SW |
502 | continue; |
503 | ||
504 | SET_FLAG(nexthop->flags, | |
505 | NEXTHOP_FLAG_RECURSIVE); | |
ad28e79a SW |
506 | nexthop_set_resolved(afi, newhop, nexthop); |
507 | resolved = 1; | |
508 | } | |
509 | if (resolved) | |
510 | re->nexthop_mtu = match->mtu; | |
511 | if (!resolved && IS_ZEBRA_DEBUG_RIB_DETAILED) | |
512 | zlog_debug("\t%s: Recursion failed to find", | |
513 | __PRETTY_FUNCTION__); | |
514 | return resolved; | |
515 | } else if (re->type == ZEBRA_ROUTE_STATIC) { | |
516 | resolved = 0; | |
6b468511 | 517 | for (ALL_NEXTHOPS_PTR(match->ng, newhop)) { |
ad28e79a SW |
518 | if (!CHECK_FLAG(match->status, |
519 | ROUTE_ENTRY_INSTALLED)) | |
520 | continue; | |
6913cb1b | 521 | if (!nexthop_valid_resolve(nexthop, newhop)) |
ad28e79a SW |
522 | continue; |
523 | ||
524 | SET_FLAG(nexthop->flags, | |
525 | NEXTHOP_FLAG_RECURSIVE); | |
526 | nexthop_set_resolved(afi, newhop, nexthop); | |
527 | resolved = 1; | |
528 | } | |
529 | if (resolved) | |
530 | re->nexthop_mtu = match->mtu; | |
531 | ||
532 | if (!resolved && IS_ZEBRA_DEBUG_RIB_DETAILED) | |
533 | zlog_debug( | |
534 | "\t%s: Static route unable to resolve", | |
535 | __PRETTY_FUNCTION__); | |
536 | return resolved; | |
537 | } else { | |
538 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) { | |
539 | zlog_debug( | |
540 | "\t%s: Route Type %s has not turned on recursion", | |
541 | __PRETTY_FUNCTION__, | |
542 | zebra_route_string(re->type)); | |
543 | if (re->type == ZEBRA_ROUTE_BGP | |
544 | && !CHECK_FLAG(re->flags, ZEBRA_FLAG_IBGP)) | |
545 | zlog_debug( | |
546 | "\tEBGP: see \"disable-ebgp-connected-route-check\" or \"disable-connected-check\""); | |
547 | } | |
548 | return 0; | |
549 | } | |
550 | } | |
551 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) | |
552 | zlog_debug("\t%s: Nexthop did not lookup in table", | |
553 | __PRETTY_FUNCTION__); | |
554 | return 0; | |
555 | } | |
556 | ||
557 | /* This function verifies reachability of one given nexthop, which can be | |
558 | * numbered or unnumbered, IPv4 or IPv6. The result is unconditionally stored | |
559 | * in nexthop->flags field. The nexthop->ifindex will be updated | |
560 | * appropriately as well. An existing route map can turn | |
561 | * (otherwise active) nexthop into inactive, but not vice versa. | |
562 | * | |
563 | * The return value is the final value of 'ACTIVE' flag. | |
564 | */ | |
565 | static unsigned nexthop_active_check(struct route_node *rn, | |
566 | struct route_entry *re, | |
567 | struct nexthop *nexthop) | |
568 | { | |
569 | struct interface *ifp; | |
b68885f9 | 570 | route_map_result_t ret = RMAP_PERMITMATCH; |
ad28e79a SW |
571 | int family; |
572 | char buf[SRCDEST2STR_BUFFER]; | |
573 | const struct prefix *p, *src_p; | |
574 | struct zebra_vrf *zvrf; | |
575 | ||
576 | srcdest_rnode_prefixes(rn, &p, &src_p); | |
577 | ||
578 | if (rn->p.family == AF_INET) | |
579 | family = AFI_IP; | |
580 | else if (rn->p.family == AF_INET6) | |
581 | family = AFI_IP6; | |
582 | else | |
583 | family = 0; | |
584 | switch (nexthop->type) { | |
585 | case NEXTHOP_TYPE_IFINDEX: | |
586 | ifp = if_lookup_by_index(nexthop->ifindex, nexthop->vrf_id); | |
587 | if (ifp && if_is_operative(ifp)) | |
588 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
589 | else | |
590 | UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
591 | break; | |
592 | case NEXTHOP_TYPE_IPV4: | |
593 | case NEXTHOP_TYPE_IPV4_IFINDEX: | |
594 | family = AFI_IP; | |
595 | if (nexthop_active(AFI_IP, re, nexthop, rn)) | |
596 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
597 | else | |
598 | UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
599 | break; | |
600 | case NEXTHOP_TYPE_IPV6: | |
601 | family = AFI_IP6; | |
602 | if (nexthop_active(AFI_IP6, re, nexthop, rn)) | |
603 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
604 | else | |
605 | UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
606 | break; | |
607 | case NEXTHOP_TYPE_IPV6_IFINDEX: | |
608 | /* RFC 5549, v4 prefix with v6 NH */ | |
609 | if (rn->p.family != AF_INET) | |
610 | family = AFI_IP6; | |
611 | if (IN6_IS_ADDR_LINKLOCAL(&nexthop->gate.ipv6)) { | |
612 | ifp = if_lookup_by_index(nexthop->ifindex, | |
613 | nexthop->vrf_id); | |
614 | if (ifp && if_is_operative(ifp)) | |
615 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
616 | else | |
617 | UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
618 | } else { | |
619 | if (nexthop_active(AFI_IP6, re, nexthop, rn)) | |
620 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
621 | else | |
622 | UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
623 | } | |
624 | break; | |
625 | case NEXTHOP_TYPE_BLACKHOLE: | |
626 | SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
627 | break; | |
628 | default: | |
629 | break; | |
630 | } | |
631 | if (!CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)) { | |
632 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) | |
633 | zlog_debug("\t%s: Unable to find a active nexthop", | |
634 | __PRETTY_FUNCTION__); | |
635 | return 0; | |
636 | } | |
637 | ||
638 | /* XXX: What exactly do those checks do? Do we support | |
639 | * e.g. IPv4 routes with IPv6 nexthops or vice versa? | |
640 | */ | |
641 | if (RIB_SYSTEM_ROUTE(re) || (family == AFI_IP && p->family != AF_INET) | |
642 | || (family == AFI_IP6 && p->family != AF_INET6)) | |
643 | return CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
644 | ||
645 | /* The original code didn't determine the family correctly | |
646 | * e.g. for NEXTHOP_TYPE_IFINDEX. Retrieve the correct afi | |
647 | * from the rib_table_info in those cases. | |
648 | * Possibly it may be better to use only the rib_table_info | |
649 | * in every case. | |
650 | */ | |
651 | if (!family) { | |
652 | rib_table_info_t *info; | |
653 | ||
654 | info = srcdest_rnode_table_info(rn); | |
655 | family = info->afi; | |
656 | } | |
657 | ||
658 | memset(&nexthop->rmap_src.ipv6, 0, sizeof(union g_addr)); | |
659 | ||
660 | zvrf = zebra_vrf_lookup_by_id(nexthop->vrf_id); | |
661 | if (!zvrf) { | |
662 | if (IS_ZEBRA_DEBUG_RIB_DETAILED) | |
663 | zlog_debug("\t%s: zvrf is NULL", __PRETTY_FUNCTION__); | |
664 | return CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
665 | } | |
666 | ||
667 | /* It'll get set if required inside */ | |
668 | ret = zebra_route_map_check(family, re->type, re->instance, p, nexthop, | |
669 | zvrf, re->tag); | |
670 | if (ret == RMAP_DENYMATCH) { | |
671 | if (IS_ZEBRA_DEBUG_RIB) { | |
672 | srcdest_rnode2str(rn, buf, sizeof(buf)); | |
673 | zlog_debug( | |
674 | "%u:%s: Filtering out with NH out %s due to route map", | |
675 | re->vrf_id, buf, | |
676 | ifindex2ifname(nexthop->ifindex, | |
677 | nexthop->vrf_id)); | |
678 | } | |
679 | UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
680 | } | |
681 | return CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
682 | } | |
683 | ||
684 | /* | |
685 | * Iterate over all nexthops of the given RIB entry and refresh their | |
9a0d4dd3 DS |
686 | * ACTIVE flag. If any nexthop is found to toggle the ACTIVE flag, |
687 | * the whole re structure is flagged with ROUTE_ENTRY_CHANGED. | |
ad28e79a SW |
688 | * |
689 | * Return value is the new number of active nexthops. | |
690 | */ | |
691 | int nexthop_active_update(struct route_node *rn, struct route_entry *re) | |
692 | { | |
693 | struct nexthop *nexthop; | |
694 | union g_addr prev_src; | |
695 | unsigned int prev_active, new_active; | |
696 | ifindex_t prev_index; | |
9a0d4dd3 | 697 | uint8_t curr_active = 0; |
ad28e79a | 698 | |
ad28e79a SW |
699 | UNSET_FLAG(re->status, ROUTE_ENTRY_CHANGED); |
700 | ||
6b468511 | 701 | for (nexthop = re->ng->nexthop; nexthop; nexthop = nexthop->next) { |
ad28e79a SW |
702 | /* No protocol daemon provides src and so we're skipping |
703 | * tracking it */ | |
704 | prev_src = nexthop->rmap_src; | |
705 | prev_active = CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); | |
706 | prev_index = nexthop->ifindex; | |
707 | /* | |
708 | * We need to respect the multipath_num here | |
709 | * as that what we should be able to install from | |
710 | * a multipath perpsective should not be a data plane | |
711 | * decision point. | |
712 | */ | |
713 | new_active = nexthop_active_check(rn, re, nexthop); | |
714 | if (new_active | |
9a0d4dd3 DS |
715 | && nexthop_group_active_nexthop_num(re->ng) |
716 | >= zrouter.multipath_num) { | |
ad28e79a SW |
717 | UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE); |
718 | new_active = 0; | |
719 | } | |
9a0d4dd3 | 720 | |
ad28e79a | 721 | if (new_active) |
9a0d4dd3 DS |
722 | curr_active++; |
723 | ||
ad28e79a SW |
724 | /* Don't allow src setting on IPv6 addr for now */ |
725 | if (prev_active != new_active || prev_index != nexthop->ifindex | |
726 | || ((nexthop->type >= NEXTHOP_TYPE_IFINDEX | |
727 | && nexthop->type < NEXTHOP_TYPE_IPV6) | |
728 | && prev_src.ipv4.s_addr | |
729 | != nexthop->rmap_src.ipv4.s_addr) | |
730 | || ((nexthop->type >= NEXTHOP_TYPE_IPV6 | |
731 | && nexthop->type < NEXTHOP_TYPE_BLACKHOLE) | |
732 | && !(IPV6_ADDR_SAME(&prev_src.ipv6, | |
733 | &nexthop->rmap_src.ipv6))) | |
42fc558e | 734 | || CHECK_FLAG(re->status, ROUTE_ENTRY_LABELS_CHANGED)) |
ad28e79a | 735 | SET_FLAG(re->status, ROUTE_ENTRY_CHANGED); |
ad28e79a SW |
736 | } |
737 | ||
9a0d4dd3 | 738 | return curr_active; |
ad28e79a | 739 | } |