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fb018d25 DS |
1 | /* BGP Nexthop tracking |
2 | * Copyright (C) 2013 Cumulus Networks, Inc. | |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra 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 | |
fb018d25 DS |
19 | */ |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "command.h" | |
24 | #include "thread.h" | |
25 | #include "prefix.h" | |
26 | #include "zclient.h" | |
27 | #include "stream.h" | |
28 | #include "network.h" | |
29 | #include "log.h" | |
30 | #include "memory.h" | |
31 | #include "nexthop.h" | |
7076bb2f | 32 | #include "vrf.h" |
039f3a34 | 33 | #include "filter.h" |
8bcb09a1 | 34 | #include "nexthop_group.h" |
fb018d25 DS |
35 | |
36 | #include "bgpd/bgpd.h" | |
37 | #include "bgpd/bgp_table.h" | |
38 | #include "bgpd/bgp_route.h" | |
39 | #include "bgpd/bgp_attr.h" | |
40 | #include "bgpd/bgp_nexthop.h" | |
41 | #include "bgpd/bgp_debug.h" | |
14454c9f | 42 | #include "bgpd/bgp_errors.h" |
fb018d25 | 43 | #include "bgpd/bgp_nht.h" |
ffd0c037 | 44 | #include "bgpd/bgp_fsm.h" |
afbb1c59 | 45 | #include "bgpd/bgp_zebra.h" |
0378bcaa | 46 | #include "bgpd/bgp_flowspec_util.h" |
7c312383 | 47 | #include "bgpd/bgp_evpn.h" |
9e15d76a | 48 | #include "bgpd/bgp_rd.h" |
fb018d25 DS |
49 | |
50 | extern struct zclient *zclient; | |
fb018d25 | 51 | |
23f60ffd DA |
52 | static void register_zebra_rnh(struct bgp_nexthop_cache *bnc); |
53 | static void unregister_zebra_rnh(struct bgp_nexthop_cache *bnc); | |
40381db7 | 54 | static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p); |
cc9f21da | 55 | static void bgp_nht_ifp_initial(struct thread *thread); |
fb018d25 | 56 | |
d62a17ae | 57 | static int bgp_isvalid_nexthop(struct bgp_nexthop_cache *bnc) |
d4d9d757 | 58 | { |
d62a17ae | 59 | return (bgp_zebra_num_connects() == 0 |
c3b95419 EDP |
60 | || (bnc && CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID) |
61 | && bnc->nexthop_num > 0)); | |
d4d9d757 LB |
62 | } |
63 | ||
4cd690ae PG |
64 | static int bgp_isvalid_nexthop_for_ebgp(struct bgp_nexthop_cache *bnc, |
65 | struct bgp_path_info *path) | |
66 | { | |
67 | struct interface *ifp = NULL; | |
68 | struct nexthop *nexthop; | |
69 | struct bgp_interface *iifp; | |
70 | struct peer *peer; | |
71 | ||
72 | if (!path->extra || !path->extra->peer_orig) | |
73 | return false; | |
74 | ||
75 | peer = path->extra->peer_orig; | |
76 | ||
77 | /* only connected ebgp peers are valid */ | |
78 | if (peer->sort != BGP_PEER_EBGP || peer->ttl != BGP_DEFAULT_TTL || | |
79 | CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) || | |
80 | CHECK_FLAG(peer->bgp->flags, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
81 | return false; | |
82 | ||
83 | for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next) { | |
84 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX || | |
85 | nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX || | |
86 | nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) { | |
87 | ifp = if_lookup_by_index( | |
88 | bnc->ifindex ? bnc->ifindex : nexthop->ifindex, | |
89 | bnc->bgp->vrf_id); | |
90 | } | |
91 | if (!ifp) | |
92 | continue; | |
93 | iifp = ifp->info; | |
94 | if (CHECK_FLAG(iifp->flags, BGP_INTERFACE_MPLS_BGP_FORWARDING)) | |
95 | return true; | |
96 | } | |
97 | return false; | |
98 | } | |
99 | ||
1bb550b6 PG |
100 | static int bgp_isvalid_nexthop_for_mplsovergre(struct bgp_nexthop_cache *bnc, |
101 | struct bgp_path_info *path) | |
102 | { | |
103 | struct interface *ifp = NULL; | |
104 | struct nexthop *nexthop; | |
105 | ||
106 | for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next) { | |
107 | if (nexthop->type != NEXTHOP_TYPE_BLACKHOLE) { | |
108 | ifp = if_lookup_by_index( | |
109 | bnc->ifindex ? bnc->ifindex : nexthop->ifindex, | |
110 | bnc->bgp->vrf_id); | |
111 | if (ifp && (ifp->ll_type == ZEBRA_LLT_IPGRE || | |
112 | ifp->ll_type == ZEBRA_LLT_IP6GRE)) | |
113 | break; | |
114 | } | |
115 | } | |
116 | if (!ifp) | |
117 | return false; | |
118 | ||
119 | if (CHECK_FLAG(path->attr->rmap_change_flags, | |
120 | BATTR_RMAP_L3VPN_ACCEPT_GRE)) | |
121 | return true; | |
122 | ||
123 | return false; | |
124 | } | |
125 | ||
126 | static int bgp_isvalid_nexthop_for_mpls(struct bgp_nexthop_cache *bnc, | |
127 | struct bgp_path_info *path) | |
960035b2 | 128 | { |
7f8c7d91 | 129 | /* |
1bb550b6 | 130 | * - In the case of MPLS-VPN, the label is learned from LDP or other |
7f8c7d91 HS |
131 | * protocols, and nexthop tracking is enabled for the label. |
132 | * The value is recorded as BGP_NEXTHOP_LABELED_VALID. | |
1bb550b6 | 133 | * - In the case of SRv6-VPN, we need to track the reachability to the |
7f8c7d91 HS |
134 | * SID (in other words, IPv6 address). As in MPLS, we need to record |
135 | * the value as BGP_NEXTHOP_SID_VALID. However, this function is | |
136 | * currently not implemented, and this function assumes that all | |
137 | * Transit routes for SRv6-VPN are valid. | |
1bb550b6 | 138 | * - Otherwise check for mpls-gre acceptance |
7f8c7d91 | 139 | */ |
1bb550b6 PG |
140 | return (bgp_zebra_num_connects() == 0 || |
141 | (bnc && (bnc->nexthop_num > 0 && | |
46dbf9d0 DA |
142 | (CHECK_FLAG(path->flags, BGP_PATH_ACCEPT_OWN) || |
143 | CHECK_FLAG(bnc->flags, BGP_NEXTHOP_LABELED_VALID) || | |
1bb550b6 | 144 | bnc->bgp->srv6_enabled || |
4cd690ae | 145 | bgp_isvalid_nexthop_for_ebgp(bnc, path) || |
1bb550b6 | 146 | bgp_isvalid_nexthop_for_mplsovergre(bnc, path))))); |
960035b2 PZ |
147 | } |
148 | ||
d62a17ae | 149 | static void bgp_unlink_nexthop_check(struct bgp_nexthop_cache *bnc) |
fb018d25 | 150 | { |
d5c4bac9 | 151 | if (LIST_EMPTY(&(bnc->paths)) && !bnc->nht_info) { |
036f482f DA |
152 | if (BGP_DEBUG(nht, NHT)) |
153 | zlog_debug("%s: freeing bnc %pFX(%d)(%u)(%s)", __func__, | |
154 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 155 | bnc->bgp->name_pretty); |
e37e1e27 PR |
156 | /* only unregister if this is the last nh for this prefix*/ |
157 | if (!bnc_existing_for_prefix(bnc)) | |
23f60ffd | 158 | unregister_zebra_rnh(bnc); |
d62a17ae | 159 | bnc_free(bnc); |
fb018d25 | 160 | } |
fb018d25 DS |
161 | } |
162 | ||
4b7e6066 | 163 | void bgp_unlink_nexthop(struct bgp_path_info *path) |
f9164b1d | 164 | { |
d62a17ae | 165 | struct bgp_nexthop_cache *bnc = path->nexthop; |
166 | ||
167 | if (!bnc) | |
168 | return; | |
f9164b1d | 169 | |
7f040da1 | 170 | path_nh_map(path, NULL, false); |
f9164b1d | 171 | |
d62a17ae | 172 | bgp_unlink_nexthop_check(bnc); |
f9164b1d PJ |
173 | } |
174 | ||
996319e6 DS |
175 | void bgp_replace_nexthop_by_peer(struct peer *from, struct peer *to) |
176 | { | |
177 | struct prefix pp; | |
178 | struct prefix pt; | |
179 | struct bgp_nexthop_cache *bncp, *bnct; | |
180 | afi_t afi; | |
35aae5c9 | 181 | ifindex_t ifindex = 0; |
996319e6 DS |
182 | |
183 | if (!sockunion2hostprefix(&from->su, &pp)) | |
184 | return; | |
185 | ||
35aae5c9 DS |
186 | /* |
187 | * Gather the ifindex for if up/down events to be | |
188 | * tagged into this fun | |
189 | */ | |
190 | if (from->conf_if && IN6_IS_ADDR_LINKLOCAL(&from->su.sin6.sin6_addr)) | |
191 | ifindex = from->su.sin6.sin6_scope_id; | |
192 | ||
996319e6 | 193 | afi = family2afi(pp.family); |
35aae5c9 | 194 | bncp = bnc_find(&from->bgp->nexthop_cache_table[afi], &pp, 0, ifindex); |
996319e6 DS |
195 | |
196 | if (!sockunion2hostprefix(&to->su, &pt)) | |
197 | return; | |
198 | ||
35aae5c9 DS |
199 | /* |
200 | * Gather the ifindex for if up/down events to be | |
201 | * tagged into this fun | |
202 | */ | |
203 | ifindex = 0; | |
204 | if (to->conf_if && IN6_IS_ADDR_LINKLOCAL(&to->su.sin6.sin6_addr)) | |
205 | ifindex = to->su.sin6.sin6_scope_id; | |
206 | bnct = bnc_find(&to->bgp->nexthop_cache_table[afi], &pt, 0, ifindex); | |
996319e6 DS |
207 | |
208 | if (bnct != bncp) | |
209 | return; | |
210 | ||
211 | if (bnct) | |
212 | bnct->nht_info = to; | |
213 | } | |
214 | ||
51f3216b PJD |
215 | /* |
216 | * Returns the bnc whose bnc->nht_info matches the LL peer by | |
217 | * looping through the IPv6 nexthop table | |
218 | */ | |
219 | static struct bgp_nexthop_cache * | |
220 | bgp_find_ipv6_nexthop_matching_peer(struct peer *peer) | |
221 | { | |
222 | struct bgp_nexthop_cache *bnc; | |
223 | ||
224 | frr_each (bgp_nexthop_cache, &peer->bgp->nexthop_cache_table[AFI_IP6], | |
225 | bnc) { | |
226 | if (bnc->nht_info == peer) { | |
227 | if (BGP_DEBUG(nht, NHT)) { | |
228 | zlog_debug( | |
229 | "Found bnc: %pFX(%u)(%u)(%p) for peer: %s(%s) %p", | |
230 | &bnc->prefix, bnc->ifindex, | |
231 | bnc->srte_color, bnc, peer->host, | |
232 | peer->bgp->name_pretty, peer); | |
233 | } | |
234 | return bnc; | |
235 | } | |
236 | } | |
237 | ||
238 | if (BGP_DEBUG(nht, NHT)) | |
239 | zlog_debug( | |
240 | "Could not find bnc for peer %s(%s) %p in v6 nexthop table", | |
241 | peer->host, peer->bgp->name_pretty, peer); | |
242 | ||
243 | return NULL; | |
244 | } | |
245 | ||
d62a17ae | 246 | void bgp_unlink_nexthop_by_peer(struct peer *peer) |
f9164b1d | 247 | { |
d62a17ae | 248 | struct prefix p; |
d62a17ae | 249 | struct bgp_nexthop_cache *bnc; |
250 | afi_t afi = family2afi(peer->su.sa.sa_family); | |
35aae5c9 | 251 | ifindex_t ifindex = 0; |
d62a17ae | 252 | |
51f3216b PJD |
253 | if (!sockunion2hostprefix(&peer->su, &p)) { |
254 | /* | |
255 | * In scenarios where unnumbered BGP session is brought | |
256 | * down by shutting down the interface before unconfiguring | |
257 | * the BGP neighbor, neighbor information in peer->su.sa | |
258 | * will be cleared when the interface is shutdown. So | |
259 | * during the deletion of unnumbered bgp peer, above check | |
260 | * will return true. Therefore, in this case,BGP needs to | |
261 | * find the bnc whose bnc->nht_info matches the | |
262 | * peer being deleted and free it. | |
263 | */ | |
264 | bnc = bgp_find_ipv6_nexthop_matching_peer(peer); | |
265 | } else { | |
266 | /* | |
267 | * Gather the ifindex for if up/down events to be | |
268 | * tagged into this fun | |
269 | */ | |
270 | if (afi == AFI_IP6 && | |
271 | IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
272 | ifindex = peer->su.sin6.sin6_scope_id; | |
273 | bnc = bnc_find(&peer->bgp->nexthop_cache_table[afi], &p, 0, | |
274 | ifindex); | |
275 | } | |
276 | ||
14315f2d | 277 | if (!bnc) |
d62a17ae | 278 | return; |
279 | ||
d62a17ae | 280 | /* cleanup the peer reference */ |
281 | bnc->nht_info = NULL; | |
282 | ||
283 | bgp_unlink_nexthop_check(bnc); | |
f9164b1d PJ |
284 | } |
285 | ||
960035b2 PZ |
286 | /* |
287 | * A route and its nexthop might belong to different VRFs. Therefore, | |
288 | * we need both the bgp_route and bgp_nexthop pointers. | |
289 | */ | |
290 | int bgp_find_or_add_nexthop(struct bgp *bgp_route, struct bgp *bgp_nexthop, | |
4053e952 | 291 | afi_t afi, safi_t safi, struct bgp_path_info *pi, |
654a5978 PG |
292 | struct peer *peer, int connected, |
293 | const struct prefix *orig_prefix) | |
fb018d25 | 294 | { |
f663c581 | 295 | struct bgp_nexthop_cache_head *tree = NULL; |
d62a17ae | 296 | struct bgp_nexthop_cache *bnc; |
ac2f64d3 | 297 | struct bgp_path_info *bpi_ultimate; |
d62a17ae | 298 | struct prefix p; |
545aeef1 | 299 | uint32_t srte_color = 0; |
d62a17ae | 300 | int is_bgp_static_route = 0; |
8761cd6d | 301 | ifindex_t ifindex = 0; |
d62a17ae | 302 | |
40381db7 DS |
303 | if (pi) { |
304 | is_bgp_static_route = ((pi->type == ZEBRA_ROUTE_BGP) | |
305 | && (pi->sub_type == BGP_ROUTE_STATIC)) | |
d62a17ae | 306 | ? 1 |
307 | : 0; | |
308 | ||
309 | /* Since Extended Next-hop Encoding (RFC5549) support, we want | |
310 | to derive | |
311 | address-family from the next-hop. */ | |
312 | if (!is_bgp_static_route) | |
7226bc40 TA |
313 | afi = BGP_ATTR_MP_NEXTHOP_LEN_IP6(pi->attr) ? AFI_IP6 |
314 | : AFI_IP; | |
d62a17ae | 315 | |
92d6f769 K |
316 | /* Validation for the ipv4 mapped ipv6 nexthop. */ |
317 | if (IS_MAPPED_IPV6(&pi->attr->mp_nexthop_global)) { | |
318 | afi = AFI_IP; | |
319 | } | |
320 | ||
2951a7a4 | 321 | /* This will return true if the global IPv6 NH is a link local |
d62a17ae | 322 | * addr */ |
40381db7 | 323 | if (make_prefix(afi, pi, &p) < 0) |
d62a17ae | 324 | return 1; |
545aeef1 | 325 | |
654a5978 PG |
326 | if (!is_bgp_static_route && orig_prefix |
327 | && prefix_same(&p, orig_prefix)) { | |
328 | if (BGP_DEBUG(nht, NHT)) { | |
329 | zlog_debug( | |
330 | "%s(%pFX): prefix loops through itself", | |
331 | __func__, &p); | |
332 | } | |
333 | return 0; | |
334 | } | |
335 | ||
545aeef1 | 336 | srte_color = pi->attr->srte_color; |
d62a17ae | 337 | } else if (peer) { |
8761cd6d DS |
338 | /* |
339 | * Gather the ifindex for if up/down events to be | |
340 | * tagged into this fun | |
341 | */ | |
35aae5c9 DS |
342 | if (afi == AFI_IP6 && |
343 | IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) { | |
8761cd6d | 344 | ifindex = peer->su.sin6.sin6_scope_id; |
35aae5c9 DS |
345 | if (ifindex == 0) { |
346 | if (BGP_DEBUG(nht, NHT)) { | |
347 | zlog_debug( | |
348 | "%s: Unable to locate ifindex, waiting till we have one", | |
349 | peer->conf_if); | |
350 | } | |
351 | return 0; | |
352 | } | |
353 | } | |
8761cd6d | 354 | |
d62a17ae | 355 | if (!sockunion2hostprefix(&peer->su, &p)) { |
356 | if (BGP_DEBUG(nht, NHT)) { | |
357 | zlog_debug( | |
358 | "%s: Attempting to register with unknown AFI %d (not %d or %d)", | |
15569c58 | 359 | __func__, afi, AFI_IP, AFI_IP6); |
d62a17ae | 360 | } |
361 | return 0; | |
362 | } | |
363 | } else | |
364 | return 0; | |
365 | ||
366 | if (is_bgp_static_route) | |
f663c581 | 367 | tree = &bgp_nexthop->import_check_table[afi]; |
d62a17ae | 368 | else |
f663c581 | 369 | tree = &bgp_nexthop->nexthop_cache_table[afi]; |
d62a17ae | 370 | |
35aae5c9 | 371 | bnc = bnc_find(tree, &p, srte_color, ifindex); |
14315f2d | 372 | if (!bnc) { |
35aae5c9 | 373 | bnc = bnc_new(tree, &p, srte_color, ifindex); |
960035b2 | 374 | bnc->bgp = bgp_nexthop; |
036f482f DA |
375 | if (BGP_DEBUG(nht, NHT)) |
376 | zlog_debug("Allocated bnc %pFX(%d)(%u)(%s) peer %p", | |
377 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 378 | bnc->bgp->name_pretty, peer); |
4115b296 | 379 | } else { |
036f482f | 380 | if (BGP_DEBUG(nht, NHT)) |
4115b296 | 381 | zlog_debug( |
036f482f DA |
382 | "Found existing bnc %pFX(%d)(%s) flags 0x%x ifindex %d #paths %d peer %p", |
383 | &bnc->prefix, bnc->ifindex, | |
384 | bnc->bgp->name_pretty, bnc->flags, bnc->ifindex, | |
385 | bnc->path_count, bnc->nht_info); | |
fc9a856f | 386 | } |
d62a17ae | 387 | |
021b6596 AD |
388 | if (pi && is_route_parent_evpn(pi)) |
389 | bnc->is_evpn_gwip_nexthop = true; | |
390 | ||
2bb8b49c | 391 | if (is_bgp_static_route) { |
d62a17ae | 392 | SET_FLAG(bnc->flags, BGP_STATIC_ROUTE); |
393 | ||
394 | /* If we're toggling the type, re-register */ | |
892fedb6 | 395 | if ((CHECK_FLAG(bgp_route->flags, BGP_FLAG_IMPORT_CHECK)) |
d62a17ae | 396 | && !CHECK_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH)) { |
397 | SET_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH); | |
398 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
399 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
892fedb6 DA |
400 | } else if ((!CHECK_FLAG(bgp_route->flags, |
401 | BGP_FLAG_IMPORT_CHECK)) | |
d62a17ae | 402 | && CHECK_FLAG(bnc->flags, |
403 | BGP_STATIC_ROUTE_EXACT_MATCH)) { | |
404 | UNSET_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH); | |
405 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
406 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
407 | } | |
078430f6 | 408 | } |
d62a17ae | 409 | /* When nexthop is already known, but now requires 'connected' |
410 | * resolution, | |
411 | * re-register it. The reverse scenario where the nexthop currently | |
412 | * requires | |
413 | * 'connected' resolution does not need a re-register (i.e., we treat | |
414 | * 'connected-required' as an override) except in the scenario where | |
415 | * this | |
416 | * is actually a case of tracking a peer for connectivity (e.g., after | |
417 | * disable connected-check). | |
418 | * NOTE: We don't track the number of paths separately for 'connected- | |
419 | * required' vs 'connected-not-required' as this change is not a common | |
420 | * scenario. | |
421 | */ | |
422 | else if (connected && !CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) { | |
423 | SET_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED); | |
424 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
425 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
2bb8b49c DS |
426 | } else if (peer && !connected |
427 | && CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) { | |
d62a17ae | 428 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED); |
429 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
430 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
078430f6 | 431 | } |
4115b296 | 432 | if (peer && (bnc->ifindex != ifindex)) { |
433 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
434 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
435 | bnc->ifindex = ifindex; | |
436 | } | |
960035b2 | 437 | if (bgp_route->inst_type == BGP_INSTANCE_TYPE_VIEW) { |
1ee0a2df DS |
438 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
439 | SET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
b54892e0 | 440 | } else if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED) |
f663c581 | 441 | && !is_default_host_route(&bnc->prefix)) |
23f60ffd | 442 | register_zebra_rnh(bnc); |
1eb6c3ea | 443 | |
40381db7 | 444 | if (pi && pi->nexthop != bnc) { |
d62a17ae | 445 | /* Unlink from existing nexthop cache, if any. This will also |
446 | * free | |
447 | * the nexthop cache entry, if appropriate. | |
448 | */ | |
40381db7 | 449 | bgp_unlink_nexthop(pi); |
d62a17ae | 450 | |
7f040da1 DS |
451 | /* updates NHT pi list reference */ |
452 | path_nh_map(pi, bnc, true); | |
d62a17ae | 453 | |
ac2f64d3 | 454 | bpi_ultimate = bgp_get_imported_bpi_ultimate(pi); |
d62a17ae | 455 | if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID) && bnc->metric) |
ac2f64d3 LS |
456 | (bgp_path_info_extra_get(bpi_ultimate))->igpmetric = |
457 | bnc->metric; | |
458 | else if (bpi_ultimate->extra) | |
459 | bpi_ultimate->extra->igpmetric = 0; | |
996319e6 DS |
460 | } else if (peer) { |
461 | /* | |
4667220e | 462 | * Let's not accidentally save the peer data for a peer |
996319e6 DS |
463 | * we are going to throw away in a second or so. |
464 | * When we come back around we'll fix up this | |
465 | * data properly in replace_nexthop_by_peer | |
466 | */ | |
467 | if (CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
468 | bnc->nht_info = (void *)peer; /* NHT peer reference */ | |
469 | } | |
d62a17ae | 470 | |
471 | /* | |
472 | * We are cheating here. Views have no associated underlying | |
473 | * ability to detect nexthops. So when we have a view | |
474 | * just tell everyone the nexthop is valid | |
475 | */ | |
960035b2 | 476 | if (bgp_route->inst_type == BGP_INSTANCE_TYPE_VIEW) |
d62a17ae | 477 | return 1; |
1bb550b6 PG |
478 | else if (safi == SAFI_UNICAST && pi && |
479 | pi->sub_type == BGP_ROUTE_IMPORTED && pi->extra && | |
480 | pi->extra->num_labels && !bnc->is_evpn_gwip_nexthop) | |
481 | return bgp_isvalid_nexthop_for_mpls(bnc, pi); | |
482 | else | |
d62a17ae | 483 | return (bgp_isvalid_nexthop(bnc)); |
fb018d25 DS |
484 | } |
485 | ||
d62a17ae | 486 | void bgp_delete_connected_nexthop(afi_t afi, struct peer *peer) |
9a233a02 | 487 | { |
d62a17ae | 488 | struct bgp_nexthop_cache *bnc; |
489 | struct prefix p; | |
35aae5c9 | 490 | ifindex_t ifindex = 0; |
d62a17ae | 491 | |
492 | if (!peer) | |
493 | return; | |
494 | ||
51f3216b PJD |
495 | /* |
496 | * In case the below check evaluates true and if | |
497 | * the bnc has not been freed at this point, then | |
498 | * we might have to do something similar to what's | |
499 | * done in bgp_unlink_nexthop_by_peer(). Since | |
500 | * bgp_unlink_nexthop_by_peer() loops through the | |
501 | * nodes of V6 nexthop cache to find the bnc, it is | |
502 | * currently not being called here. | |
503 | */ | |
d62a17ae | 504 | if (!sockunion2hostprefix(&peer->su, &p)) |
505 | return; | |
35aae5c9 DS |
506 | /* |
507 | * Gather the ifindex for if up/down events to be | |
508 | * tagged into this fun | |
509 | */ | |
510 | if (afi == AFI_IP6 && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
511 | ifindex = peer->su.sin6.sin6_scope_id; | |
f663c581 | 512 | bnc = bnc_find(&peer->bgp->nexthop_cache_table[family2afi(p.family)], |
35aae5c9 | 513 | &p, 0, ifindex); |
14315f2d DS |
514 | if (!bnc) { |
515 | if (BGP_DEBUG(nht, NHT)) | |
8c1a4c10 | 516 | zlog_debug( |
f663c581 | 517 | "Cannot find connected NHT node for peer %s(%s)", |
8c1a4c10 | 518 | peer->host, peer->bgp->name_pretty); |
14315f2d DS |
519 | return; |
520 | } | |
d62a17ae | 521 | |
522 | if (bnc->nht_info != peer) { | |
523 | if (BGP_DEBUG(nht, NHT)) | |
524 | zlog_debug( | |
8c1a4c10 DS |
525 | "Connected NHT %p node for peer %s(%s) points to %p", |
526 | bnc, peer->host, bnc->bgp->name_pretty, | |
527 | bnc->nht_info); | |
d62a17ae | 528 | return; |
529 | } | |
530 | ||
531 | bnc->nht_info = NULL; | |
532 | ||
533 | if (LIST_EMPTY(&(bnc->paths))) { | |
534 | if (BGP_DEBUG(nht, NHT)) | |
8c1a4c10 DS |
535 | zlog_debug( |
536 | "Freeing connected NHT node %p for peer %s(%s)", | |
537 | bnc, peer->host, bnc->bgp->name_pretty); | |
23f60ffd | 538 | unregister_zebra_rnh(bnc); |
d62a17ae | 539 | bnc_free(bnc); |
540 | } | |
9a233a02 DS |
541 | } |
542 | ||
545aeef1 | 543 | static void bgp_process_nexthop_update(struct bgp_nexthop_cache *bnc, |
9f002fa5 DS |
544 | struct zapi_route *nhr, |
545 | bool import_check) | |
fb018d25 | 546 | { |
d62a17ae | 547 | struct nexthop *nexthop; |
548 | struct nexthop *oldnh; | |
549 | struct nexthop *nhlist_head = NULL; | |
550 | struct nexthop *nhlist_tail = NULL; | |
d62a17ae | 551 | int i; |
021b6596 | 552 | bool evpn_resolved = false; |
14315f2d | 553 | |
083ec940 | 554 | bnc->last_update = monotime(NULL); |
d62a17ae | 555 | bnc->change_flags = 0; |
d62a17ae | 556 | |
557 | /* debug print the input */ | |
987a720a DS |
558 | if (BGP_DEBUG(nht, NHT)) { |
559 | char bnc_buf[BNC_FLAG_DUMP_SIZE]; | |
560 | ||
d62a17ae | 561 | zlog_debug( |
35aae5c9 | 562 | "%s(%u): Rcvd NH update %pFX(%u)%u) - metric %d/%d #nhops %d/%d flags %s", |
2dbe669b | 563 | bnc->bgp->name_pretty, bnc->bgp->vrf_id, &nhr->prefix, |
35aae5c9 | 564 | bnc->ifindex, bnc->srte_color, nhr->metric, bnc->metric, |
987a720a DS |
565 | nhr->nexthop_num, bnc->nexthop_num, |
566 | bgp_nexthop_dump_bnc_flags(bnc, bnc_buf, | |
567 | sizeof(bnc_buf))); | |
568 | } | |
d62a17ae | 569 | |
545aeef1 | 570 | if (nhr->metric != bnc->metric) |
d62a17ae | 571 | bnc->change_flags |= BGP_NEXTHOP_METRIC_CHANGED; |
572 | ||
545aeef1 | 573 | if (nhr->nexthop_num != bnc->nexthop_num) |
d62a17ae | 574 | bnc->change_flags |= BGP_NEXTHOP_CHANGED; |
575 | ||
9f002fa5 DS |
576 | if (import_check && (nhr->type == ZEBRA_ROUTE_BGP || |
577 | !prefix_same(&bnc->prefix, &nhr->prefix))) { | |
578 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
579 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
580 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_LABELED_VALID); | |
581 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_EVPN_INCOMPLETE); | |
582 | ||
583 | bnc_nexthop_free(bnc); | |
584 | bnc->nexthop = NULL; | |
585 | ||
586 | if (BGP_DEBUG(nht, NHT)) | |
587 | zlog_debug( | |
588 | "%s: Import Check does not resolve to the same prefix for %pFX received %pFX or matching route is BGP", | |
589 | __func__, &bnc->prefix, &nhr->prefix); | |
590 | } else if (nhr->nexthop_num) { | |
6137a77d DS |
591 | struct peer *peer = bnc->nht_info; |
592 | ||
d62a17ae | 593 | /* notify bgp fsm if nbr ip goes from invalid->valid */ |
594 | if (!bnc->nexthop_num) | |
595 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
596 | ||
021b6596 AD |
597 | if (!bnc->is_evpn_gwip_nexthop) |
598 | bnc->flags |= BGP_NEXTHOP_VALID; | |
545aeef1 RW |
599 | bnc->metric = nhr->metric; |
600 | bnc->nexthop_num = nhr->nexthop_num; | |
4a749e2c | 601 | |
960035b2 PZ |
602 | bnc->flags &= ~BGP_NEXTHOP_LABELED_VALID; /* check below */ |
603 | ||
545aeef1 | 604 | for (i = 0; i < nhr->nexthop_num; i++) { |
960035b2 PZ |
605 | int num_labels = 0; |
606 | ||
545aeef1 | 607 | nexthop = nexthop_from_zapi_nexthop(&nhr->nexthops[i]); |
d62a17ae | 608 | |
6137a77d DS |
609 | /* |
610 | * Turn on RA for the v6 nexthops | |
611 | * we receive from bgp. This is to allow us | |
612 | * to work with v4 routing over v6 nexthops | |
613 | */ | |
687a2b5d DS |
614 | if (peer && !peer->ifp |
615 | && CHECK_FLAG(peer->flags, | |
616 | PEER_FLAG_CAPABILITY_ENHE) | |
545aeef1 | 617 | && nhr->prefix.family == AF_INET6 |
65f803e8 | 618 | && nexthop->type != NEXTHOP_TYPE_BLACKHOLE) { |
6137a77d DS |
619 | struct interface *ifp; |
620 | ||
621 | ifp = if_lookup_by_index(nexthop->ifindex, | |
622 | nexthop->vrf_id); | |
8c9769e0 DS |
623 | if (ifp) |
624 | zclient_send_interface_radv_req( | |
625 | zclient, nexthop->vrf_id, ifp, | |
626 | true, | |
627 | BGP_UNNUM_DEFAULT_RA_INTERVAL); | |
6137a77d | 628 | } |
960035b2 PZ |
629 | /* There is at least one label-switched path */ |
630 | if (nexthop->nh_label && | |
631 | nexthop->nh_label->num_labels) { | |
632 | ||
633 | bnc->flags |= BGP_NEXTHOP_LABELED_VALID; | |
634 | num_labels = nexthop->nh_label->num_labels; | |
635 | } | |
636 | ||
d62a17ae | 637 | if (BGP_DEBUG(nht, NHT)) { |
638 | char buf[NEXTHOP_STRLEN]; | |
639 | zlog_debug( | |
960035b2 PZ |
640 | " nhop via %s (%d labels)", |
641 | nexthop2str(nexthop, buf, sizeof(buf)), | |
642 | num_labels); | |
d62a17ae | 643 | } |
644 | ||
645 | if (nhlist_tail) { | |
646 | nhlist_tail->next = nexthop; | |
647 | nhlist_tail = nexthop; | |
648 | } else { | |
649 | nhlist_tail = nexthop; | |
650 | nhlist_head = nexthop; | |
651 | } | |
652 | ||
653 | /* No need to evaluate the nexthop if we have already | |
654 | * determined | |
655 | * that there has been a change. | |
656 | */ | |
657 | if (bnc->change_flags & BGP_NEXTHOP_CHANGED) | |
658 | continue; | |
659 | ||
660 | for (oldnh = bnc->nexthop; oldnh; oldnh = oldnh->next) | |
78fba41b | 661 | if (nexthop_same(oldnh, nexthop)) |
d62a17ae | 662 | break; |
663 | ||
664 | if (!oldnh) | |
665 | bnc->change_flags |= BGP_NEXTHOP_CHANGED; | |
666 | } | |
667 | bnc_nexthop_free(bnc); | |
668 | bnc->nexthop = nhlist_head; | |
021b6596 AD |
669 | |
670 | /* | |
671 | * Gateway IP nexthop is L3 reachable. Mark it as | |
672 | * BGP_NEXTHOP_VALID only if it is recursively resolved with a | |
673 | * remote EVPN RT-2. | |
674 | * Else, mark it as BGP_NEXTHOP_EVPN_INCOMPLETE. | |
675 | * When its mapping with EVPN RT-2 is established, unset | |
676 | * BGP_NEXTHOP_EVPN_INCOMPLETE and set BGP_NEXTHOP_VALID. | |
677 | */ | |
678 | if (bnc->is_evpn_gwip_nexthop) { | |
679 | evpn_resolved = bgp_evpn_is_gateway_ip_resolved(bnc); | |
680 | ||
511211bf | 681 | if (BGP_DEBUG(nht, NHT)) |
021b6596 | 682 | zlog_debug( |
511211bf DA |
683 | "EVPN gateway IP %pFX recursive MAC/IP lookup %s", |
684 | &bnc->prefix, | |
021b6596 AD |
685 | (evpn_resolved ? "successful" |
686 | : "failed")); | |
021b6596 AD |
687 | |
688 | if (evpn_resolved) { | |
689 | bnc->flags |= BGP_NEXTHOP_VALID; | |
690 | bnc->flags &= ~BGP_NEXTHOP_EVPN_INCOMPLETE; | |
691 | bnc->change_flags |= BGP_NEXTHOP_MACIP_CHANGED; | |
692 | } else { | |
693 | bnc->flags |= BGP_NEXTHOP_EVPN_INCOMPLETE; | |
694 | bnc->flags &= ~BGP_NEXTHOP_VALID; | |
695 | } | |
696 | } | |
d62a17ae | 697 | } else { |
021b6596 | 698 | bnc->flags &= ~BGP_NEXTHOP_EVPN_INCOMPLETE; |
d62a17ae | 699 | bnc->flags &= ~BGP_NEXTHOP_VALID; |
c3b95419 | 700 | bnc->flags &= ~BGP_NEXTHOP_LABELED_VALID; |
545aeef1 | 701 | bnc->nexthop_num = nhr->nexthop_num; |
d62a17ae | 702 | |
703 | /* notify bgp fsm if nbr ip goes from valid->invalid */ | |
704 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
705 | ||
706 | bnc_nexthop_free(bnc); | |
707 | bnc->nexthop = NULL; | |
708 | } | |
709 | ||
710 | evaluate_paths(bnc); | |
fb018d25 DS |
711 | } |
712 | ||
8761cd6d DS |
713 | static void bgp_nht_ifp_table_handle(struct bgp *bgp, |
714 | struct bgp_nexthop_cache_head *table, | |
715 | struct interface *ifp, bool up) | |
716 | { | |
717 | struct bgp_nexthop_cache *bnc; | |
718 | ||
719 | frr_each (bgp_nexthop_cache, table, bnc) { | |
720 | if (bnc->ifindex != ifp->ifindex) | |
721 | continue; | |
722 | ||
083ec940 | 723 | bnc->last_update = monotime(NULL); |
8761cd6d DS |
724 | bnc->change_flags = 0; |
725 | ||
474cfe4a DS |
726 | /* |
727 | * For interface based routes ( ala the v6 LL routes | |
728 | * that this was written for ) the metric received | |
729 | * for the connected route is 0 not 1. | |
730 | */ | |
731 | bnc->metric = 0; | |
8761cd6d DS |
732 | if (up) { |
733 | SET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
734 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
8761cd6d DS |
735 | bnc->nexthop_num = 1; |
736 | } else { | |
737 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
738 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
739 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
740 | bnc->nexthop_num = 0; | |
8761cd6d DS |
741 | } |
742 | ||
743 | evaluate_paths(bnc); | |
744 | } | |
745 | } | |
746 | static void bgp_nht_ifp_handle(struct interface *ifp, bool up) | |
747 | { | |
748 | struct bgp *bgp; | |
749 | ||
096f7609 | 750 | bgp = ifp->vrf->info; |
8761cd6d DS |
751 | if (!bgp) |
752 | return; | |
753 | ||
7f2e9cce DS |
754 | bgp_nht_ifp_table_handle(bgp, &bgp->nexthop_cache_table[AFI_IP], ifp, |
755 | up); | |
756 | bgp_nht_ifp_table_handle(bgp, &bgp->import_check_table[AFI_IP], ifp, | |
757 | up); | |
8761cd6d DS |
758 | bgp_nht_ifp_table_handle(bgp, &bgp->nexthop_cache_table[AFI_IP6], ifp, |
759 | up); | |
760 | bgp_nht_ifp_table_handle(bgp, &bgp->import_check_table[AFI_IP6], ifp, | |
761 | up); | |
762 | } | |
763 | ||
764 | void bgp_nht_ifp_up(struct interface *ifp) | |
765 | { | |
766 | bgp_nht_ifp_handle(ifp, true); | |
767 | } | |
768 | ||
769 | void bgp_nht_ifp_down(struct interface *ifp) | |
770 | { | |
771 | bgp_nht_ifp_handle(ifp, false); | |
772 | } | |
773 | ||
cc9f21da | 774 | static void bgp_nht_ifp_initial(struct thread *thread) |
8761cd6d DS |
775 | { |
776 | ifindex_t ifindex = THREAD_VAL(thread); | |
0b52b75a IR |
777 | struct bgp *bgp = THREAD_ARG(thread); |
778 | struct interface *ifp = if_lookup_by_index(ifindex, bgp->vrf_id); | |
8761cd6d DS |
779 | |
780 | if (!ifp) | |
cc9f21da | 781 | return; |
8761cd6d | 782 | |
4115b296 | 783 | if (BGP_DEBUG(nht, NHT)) |
784 | zlog_debug( | |
785 | "Handle NHT initial update for Intf %s(%d) status %s", | |
786 | ifp->name, ifp->ifindex, if_is_up(ifp) ? "up" : "down"); | |
787 | ||
8761cd6d DS |
788 | if (if_is_up(ifp)) |
789 | bgp_nht_ifp_up(ifp); | |
790 | else | |
791 | bgp_nht_ifp_down(ifp); | |
8761cd6d DS |
792 | } |
793 | ||
794 | /* | |
795 | * So the bnc code has the ability to handle interface up/down | |
796 | * events to properly handle v6 LL peering. | |
797 | * What is happening here: | |
798 | * The event system for peering expects the nht code to | |
799 | * report on the tracking events after we move to active | |
800 | * So let's give the system a chance to report on that event | |
801 | * in a manner that is expected. | |
802 | */ | |
803 | void bgp_nht_interface_events(struct peer *peer) | |
804 | { | |
805 | struct bgp *bgp = peer->bgp; | |
806 | struct bgp_nexthop_cache_head *table; | |
807 | struct bgp_nexthop_cache *bnc; | |
808 | struct prefix p; | |
35aae5c9 | 809 | ifindex_t ifindex = 0; |
8761cd6d DS |
810 | |
811 | if (!IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
812 | return; | |
813 | ||
814 | if (!sockunion2hostprefix(&peer->su, &p)) | |
815 | return; | |
35aae5c9 DS |
816 | /* |
817 | * Gather the ifindex for if up/down events to be | |
818 | * tagged into this fun | |
819 | */ | |
820 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
821 | ifindex = peer->su.sin6.sin6_scope_id; | |
8761cd6d DS |
822 | |
823 | table = &bgp->nexthop_cache_table[AFI_IP6]; | |
35aae5c9 | 824 | bnc = bnc_find(table, &p, 0, ifindex); |
8761cd6d DS |
825 | if (!bnc) |
826 | return; | |
827 | ||
828 | if (bnc->ifindex) | |
0b52b75a | 829 | thread_add_event(bm->master, bgp_nht_ifp_initial, bnc->bgp, |
8761cd6d DS |
830 | bnc->ifindex, NULL); |
831 | } | |
832 | ||
545aeef1 RW |
833 | void bgp_parse_nexthop_update(int command, vrf_id_t vrf_id) |
834 | { | |
835 | struct bgp_nexthop_cache_head *tree = NULL; | |
b8210849 | 836 | struct bgp_nexthop_cache *bnc_nhc, *bnc_import; |
545aeef1 | 837 | struct bgp *bgp; |
06e4e901 | 838 | struct prefix match; |
545aeef1 RW |
839 | struct zapi_route nhr; |
840 | afi_t afi; | |
841 | ||
842 | bgp = bgp_lookup_by_vrf_id(vrf_id); | |
843 | if (!bgp) { | |
844 | flog_err( | |
845 | EC_BGP_NH_UPD, | |
846 | "parse nexthop update: instance not found for vrf_id %u", | |
847 | vrf_id); | |
848 | return; | |
849 | } | |
850 | ||
06e4e901 | 851 | if (!zapi_nexthop_update_decode(zclient->ibuf, &match, &nhr)) { |
cc42c4f0 DS |
852 | zlog_err("%s[%s]: Failure to decode nexthop update", __func__, |
853 | bgp->name_pretty); | |
545aeef1 RW |
854 | return; |
855 | } | |
856 | ||
06e4e901 | 857 | afi = family2afi(match.family); |
b8210849 | 858 | tree = &bgp->nexthop_cache_table[afi]; |
545aeef1 | 859 | |
35aae5c9 | 860 | bnc_nhc = bnc_find(tree, &match, nhr.srte_color, 0); |
2bb8b49c DS |
861 | if (!bnc_nhc) { |
862 | if (BGP_DEBUG(nht, NHT)) | |
863 | zlog_debug( | |
864 | "parse nexthop update(%pFX(%u)(%s)): bnc info not found for nexthop cache", | |
865 | &nhr.prefix, nhr.srte_color, bgp->name_pretty); | |
866 | } else | |
9f002fa5 | 867 | bgp_process_nexthop_update(bnc_nhc, &nhr, false); |
b8210849 DS |
868 | |
869 | tree = &bgp->import_check_table[afi]; | |
870 | ||
35aae5c9 | 871 | bnc_import = bnc_find(tree, &match, nhr.srte_color, 0); |
2bb8b49c DS |
872 | if (!bnc_import) { |
873 | if (BGP_DEBUG(nht, NHT)) | |
874 | zlog_debug( | |
875 | "parse nexthop update(%pFX(%u)(%s)): bnc info not found for import check", | |
876 | &nhr.prefix, nhr.srte_color, bgp->name_pretty); | |
877 | } else | |
d00a5f6b | 878 | bgp_process_nexthop_update(bnc_import, &nhr, true); |
1e24860b | 879 | |
545aeef1 RW |
880 | /* |
881 | * HACK: if any BGP route is dependant on an SR-policy that doesn't | |
882 | * exist, zebra will never send NH updates relative to that policy. In | |
883 | * that case, whenever we receive an update about a colorless NH, update | |
884 | * the corresponding colorful NHs that share the same endpoint but that | |
885 | * are inactive. This ugly hack should work around the problem at the | |
886 | * cost of a performance pernalty. Long term, what should be done is to | |
887 | * make zebra's RNH subsystem aware of SR-TE colors (like bgpd is), | |
888 | * which should provide a better infrastructure to solve this issue in | |
889 | * a more efficient and elegant way. | |
890 | */ | |
b8210849 | 891 | if (nhr.srte_color == 0 && bnc_nhc) { |
545aeef1 RW |
892 | struct bgp_nexthop_cache *bnc_iter; |
893 | ||
894 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], | |
895 | bnc_iter) { | |
d00a5f6b DS |
896 | if (!prefix_same(&bnc_nhc->prefix, &bnc_iter->prefix) || |
897 | bnc_iter->srte_color == 0 || | |
898 | CHECK_FLAG(bnc_iter->flags, BGP_NEXTHOP_VALID)) | |
545aeef1 RW |
899 | continue; |
900 | ||
9f002fa5 | 901 | bgp_process_nexthop_update(bnc_iter, &nhr, false); |
545aeef1 RW |
902 | } |
903 | } | |
904 | } | |
905 | ||
ee7ca6c0 | 906 | /* |
907 | * Cleanup nexthop registration and status information for BGP nexthops | |
908 | * pertaining to this VRF. This is invoked upon VRF deletion. | |
909 | */ | |
910 | void bgp_cleanup_nexthops(struct bgp *bgp) | |
911 | { | |
f663c581 RW |
912 | for (afi_t afi = AFI_IP; afi < AFI_MAX; afi++) { |
913 | struct bgp_nexthop_cache *bnc; | |
ee7ca6c0 | 914 | |
f663c581 RW |
915 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], |
916 | bnc) { | |
ee7ca6c0 | 917 | /* Clear relevant flags. */ |
918 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
919 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
920 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
021b6596 | 921 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_EVPN_INCOMPLETE); |
ee7ca6c0 | 922 | } |
923 | } | |
924 | } | |
925 | ||
fb018d25 DS |
926 | /** |
927 | * make_prefix - make a prefix structure from the path (essentially | |
928 | * path's node. | |
929 | */ | |
40381db7 | 930 | static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p) |
fb018d25 | 931 | { |
078430f6 | 932 | |
40381db7 DS |
933 | int is_bgp_static = ((pi->type == ZEBRA_ROUTE_BGP) |
934 | && (pi->sub_type == BGP_ROUTE_STATIC)) | |
d62a17ae | 935 | ? 1 |
936 | : 0; | |
9bcb3eef DS |
937 | struct bgp_dest *net = pi->net; |
938 | const struct prefix *p_orig = bgp_dest_get_prefix(net); | |
92d6f769 | 939 | struct in_addr ipv4; |
0378bcaa PG |
940 | |
941 | if (p_orig->family == AF_FLOWSPEC) { | |
942 | if (!pi->peer) | |
943 | return -1; | |
944 | return bgp_flowspec_get_first_nh(pi->peer->bgp, | |
1840384b | 945 | pi, p, afi); |
0378bcaa | 946 | } |
d62a17ae | 947 | memset(p, 0, sizeof(struct prefix)); |
948 | switch (afi) { | |
949 | case AFI_IP: | |
950 | p->family = AF_INET; | |
951 | if (is_bgp_static) { | |
b54892e0 DS |
952 | p->u.prefix4 = p_orig->u.prefix4; |
953 | p->prefixlen = p_orig->prefixlen; | |
d62a17ae | 954 | } else { |
92d6f769 K |
955 | if (IS_MAPPED_IPV6(&pi->attr->mp_nexthop_global)) { |
956 | ipv4_mapped_ipv6_to_ipv4( | |
957 | &pi->attr->mp_nexthop_global, &ipv4); | |
958 | p->u.prefix4 = ipv4; | |
959 | p->prefixlen = IPV4_MAX_BITLEN; | |
960 | } else { | |
7226bc40 TA |
961 | if (p_orig->family == AF_EVPN) |
962 | p->u.prefix4 = | |
963 | pi->attr->mp_nexthop_global_in; | |
964 | else | |
965 | p->u.prefix4 = pi->attr->nexthop; | |
92d6f769 K |
966 | p->prefixlen = IPV4_MAX_BITLEN; |
967 | } | |
d62a17ae | 968 | } |
969 | break; | |
970 | case AFI_IP6: | |
d62a17ae | 971 | p->family = AF_INET6; |
972 | ||
973 | if (is_bgp_static) { | |
b54892e0 DS |
974 | p->u.prefix6 = p_orig->u.prefix6; |
975 | p->prefixlen = p_orig->prefixlen; | |
d62a17ae | 976 | } else { |
606fdbb1 DA |
977 | /* If we receive MP_REACH nexthop with ::(LL) |
978 | * or LL(LL), use LL address as nexthop cache. | |
979 | */ | |
980 | if (pi->attr->mp_nexthop_len | |
981 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL | |
982 | && (IN6_IS_ADDR_UNSPECIFIED( | |
983 | &pi->attr->mp_nexthop_global) | |
984 | || IN6_IS_ADDR_LINKLOCAL( | |
985 | &pi->attr->mp_nexthop_global))) | |
986 | p->u.prefix6 = pi->attr->mp_nexthop_local; | |
17ef5a93 PG |
987 | /* If we receive MR_REACH with (GA)::(LL) |
988 | * then check for route-map to choose GA or LL | |
989 | */ | |
990 | else if (pi->attr->mp_nexthop_len | |
991 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2bb8b49c | 992 | if (pi->attr->mp_nexthop_prefer_global) |
17ef5a93 PG |
993 | p->u.prefix6 = |
994 | pi->attr->mp_nexthop_global; | |
995 | else | |
996 | p->u.prefix6 = | |
997 | pi->attr->mp_nexthop_local; | |
998 | } else | |
606fdbb1 | 999 | p->u.prefix6 = pi->attr->mp_nexthop_global; |
d62a17ae | 1000 | p->prefixlen = IPV6_MAX_BITLEN; |
1001 | } | |
1002 | break; | |
1003 | default: | |
1004 | if (BGP_DEBUG(nht, NHT)) { | |
1005 | zlog_debug( | |
1006 | "%s: Attempting to make prefix with unknown AFI %d (not %d or %d)", | |
15569c58 | 1007 | __func__, afi, AFI_IP, AFI_IP6); |
d62a17ae | 1008 | } |
1009 | break; | |
65740e1b | 1010 | } |
d62a17ae | 1011 | return 0; |
fb018d25 DS |
1012 | } |
1013 | ||
1014 | /** | |
078430f6 | 1015 | * sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister |
fb018d25 DS |
1016 | * command to Zebra. |
1017 | * ARGUMENTS: | |
1018 | * struct bgp_nexthop_cache *bnc -- the nexthop structure. | |
078430f6 | 1019 | * int command -- command to send to zebra |
fb018d25 DS |
1020 | * RETURNS: |
1021 | * void. | |
1022 | */ | |
d62a17ae | 1023 | static void sendmsg_zebra_rnh(struct bgp_nexthop_cache *bnc, int command) |
fb018d25 | 1024 | { |
3c192540 | 1025 | bool exact_match = false; |
ed6cec97 | 1026 | bool resolve_via_default = false; |
d62a17ae | 1027 | int ret; |
1028 | ||
3c192540 | 1029 | if (!zclient) |
d62a17ae | 1030 | return; |
1031 | ||
1032 | /* Don't try to register if Zebra doesn't know of this instance. */ | |
bb4ef1ae DS |
1033 | if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bnc->bgp)) { |
1034 | if (BGP_DEBUG(zebra, ZEBRA)) | |
15569c58 DA |
1035 | zlog_debug( |
1036 | "%s: No zebra instance to talk to, not installing NHT entry", | |
1037 | __func__); | |
d62a17ae | 1038 | return; |
bb4ef1ae | 1039 | } |
d62a17ae | 1040 | |
1ee0a2df DS |
1041 | if (!bgp_zebra_num_connects()) { |
1042 | if (BGP_DEBUG(zebra, ZEBRA)) | |
15569c58 DA |
1043 | zlog_debug( |
1044 | "%s: We have not connected yet, cannot send nexthops", | |
1045 | __func__); | |
1ee0a2df | 1046 | } |
ed6cec97 DS |
1047 | if (command == ZEBRA_NEXTHOP_REGISTER) { |
1048 | if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) | |
1049 | exact_match = true; | |
1050 | if (CHECK_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH)) | |
1051 | resolve_via_default = true; | |
1052 | } | |
d62a17ae | 1053 | |
f663c581 RW |
1054 | if (BGP_DEBUG(zebra, ZEBRA)) |
1055 | zlog_debug("%s: sending cmd %s for %pFX (vrf %s)", __func__, | |
1056 | zserv_command_string(command), &bnc->prefix, | |
1057 | bnc->bgp->name_pretty); | |
960035b2 | 1058 | |
eb3c9d97 DL |
1059 | ret = zclient_send_rnh(zclient, command, &bnc->prefix, SAFI_UNICAST, |
1060 | exact_match, resolve_via_default, | |
1061 | bnc->bgp->vrf_id); | |
a6522038 | 1062 | if (ret == ZCLIENT_SEND_FAILURE) { |
e50f7cfd | 1063 | flog_warn(EC_BGP_ZEBRA_SEND, |
f162a5b9 | 1064 | "sendmsg_nexthop: zclient_send_message() failed"); |
a6522038 | 1065 | return; |
1066 | } | |
d62a17ae | 1067 | |
3d174ce0 | 1068 | if (command == ZEBRA_NEXTHOP_REGISTER) |
d62a17ae | 1069 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
3d174ce0 | 1070 | else if (command == ZEBRA_NEXTHOP_UNREGISTER) |
d62a17ae | 1071 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
1072 | return; | |
fb018d25 DS |
1073 | } |
1074 | ||
1075 | /** | |
078430f6 DS |
1076 | * register_zebra_rnh - register a NH/route with Zebra for notification |
1077 | * when the route or the route to the nexthop changes. | |
fb018d25 | 1078 | * ARGUMENTS: |
078430f6 | 1079 | * struct bgp_nexthop_cache *bnc |
fb018d25 DS |
1080 | * RETURNS: |
1081 | * void. | |
1082 | */ | |
23f60ffd | 1083 | static void register_zebra_rnh(struct bgp_nexthop_cache *bnc) |
fb018d25 | 1084 | { |
d62a17ae | 1085 | /* Check if we have already registered */ |
1086 | if (bnc->flags & BGP_NEXTHOP_REGISTERED) | |
1087 | return; | |
8761cd6d DS |
1088 | |
1089 | if (bnc->ifindex) { | |
1090 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
1091 | return; | |
1092 | } | |
1093 | ||
3d174ce0 | 1094 | sendmsg_zebra_rnh(bnc, ZEBRA_NEXTHOP_REGISTER); |
fb018d25 DS |
1095 | } |
1096 | ||
1097 | /** | |
078430f6 | 1098 | * unregister_zebra_rnh -- Unregister the route/nexthop from Zebra. |
fb018d25 | 1099 | * ARGUMENTS: |
078430f6 | 1100 | * struct bgp_nexthop_cache *bnc |
fb018d25 DS |
1101 | * RETURNS: |
1102 | * void. | |
1103 | */ | |
23f60ffd | 1104 | static void unregister_zebra_rnh(struct bgp_nexthop_cache *bnc) |
fb018d25 | 1105 | { |
d62a17ae | 1106 | /* Check if we have already registered */ |
1107 | if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED)) | |
1108 | return; | |
1109 | ||
8761cd6d DS |
1110 | if (bnc->ifindex) { |
1111 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
1112 | return; | |
1113 | } | |
1114 | ||
3d174ce0 | 1115 | sendmsg_zebra_rnh(bnc, ZEBRA_NEXTHOP_UNREGISTER); |
fb018d25 DS |
1116 | } |
1117 | ||
1118 | /** | |
1119 | * evaluate_paths - Evaluate the paths/nets associated with a nexthop. | |
1120 | * ARGUMENTS: | |
1121 | * struct bgp_nexthop_cache *bnc -- the nexthop structure. | |
1122 | * RETURNS: | |
1123 | * void. | |
1124 | */ | |
021b6596 | 1125 | void evaluate_paths(struct bgp_nexthop_cache *bnc) |
fb018d25 | 1126 | { |
9bcb3eef | 1127 | struct bgp_dest *dest; |
4b7e6066 | 1128 | struct bgp_path_info *path; |
ac2f64d3 | 1129 | struct bgp_path_info *bpi_ultimate; |
d62a17ae | 1130 | int afi; |
1131 | struct peer *peer = (struct peer *)bnc->nht_info; | |
1132 | struct bgp_table *table; | |
1133 | safi_t safi; | |
960035b2 | 1134 | struct bgp *bgp_path; |
b54892e0 | 1135 | const struct prefix *p; |
d62a17ae | 1136 | |
1137 | if (BGP_DEBUG(nht, NHT)) { | |
987a720a | 1138 | char bnc_buf[BNC_FLAG_DUMP_SIZE]; |
df2a41a9 | 1139 | char chg_buf[BNC_FLAG_DUMP_SIZE]; |
987a720a | 1140 | |
d62a17ae | 1141 | zlog_debug( |
036f482f DA |
1142 | "NH update for %pFX(%d)(%u)(%s) - flags %s chgflags %s- evaluate paths", |
1143 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 1144 | bnc->bgp->name_pretty, |
df2a41a9 DS |
1145 | bgp_nexthop_dump_bnc_flags(bnc, bnc_buf, |
1146 | sizeof(bnc_buf)), | |
1147 | bgp_nexthop_dump_bnc_change_flags(bnc, chg_buf, | |
1148 | sizeof(bnc_buf))); | |
fb018d25 DS |
1149 | } |
1150 | ||
a2addae8 | 1151 | LIST_FOREACH (path, &(bnc->paths), nh_thread) { |
d62a17ae | 1152 | if (!(path->type == ZEBRA_ROUTE_BGP |
1153 | && ((path->sub_type == BGP_ROUTE_NORMAL) | |
960035b2 PZ |
1154 | || (path->sub_type == BGP_ROUTE_STATIC) |
1155 | || (path->sub_type == BGP_ROUTE_IMPORTED)))) | |
d62a17ae | 1156 | continue; |
1157 | ||
9bcb3eef DS |
1158 | dest = path->net; |
1159 | assert(dest && bgp_dest_table(dest)); | |
1160 | p = bgp_dest_get_prefix(dest); | |
b54892e0 | 1161 | afi = family2afi(p->family); |
9bcb3eef | 1162 | table = bgp_dest_table(dest); |
d62a17ae | 1163 | safi = table->safi; |
1164 | ||
960035b2 PZ |
1165 | /* |
1166 | * handle routes from other VRFs (they can have a | |
1167 | * nexthop in THIS VRF). bgp_path is the bgp instance | |
1168 | * that owns the route referencing this nexthop. | |
1169 | */ | |
1170 | bgp_path = table->bgp; | |
1171 | ||
1172 | /* | |
1173 | * Path becomes valid/invalid depending on whether the nexthop | |
d62a17ae | 1174 | * reachable/unreachable. |
960035b2 PZ |
1175 | * |
1176 | * In case of unicast routes that were imported from vpn | |
1177 | * and that have labels, they are valid only if there are | |
1178 | * nexthops with labels | |
a2299aba AD |
1179 | * |
1180 | * If the nexthop is EVPN gateway-IP, | |
1181 | * do not check for a valid label. | |
d62a17ae | 1182 | */ |
960035b2 | 1183 | |
34ea39b6 | 1184 | bool bnc_is_valid_nexthop = false; |
1185 | bool path_valid = false; | |
960035b2 | 1186 | |
021b6596 AD |
1187 | if (safi == SAFI_UNICAST && path->sub_type == BGP_ROUTE_IMPORTED |
1188 | && path->extra && path->extra->num_labels | |
1189 | && (path->attr->evpn_overlay.type | |
1190 | != OVERLAY_INDEX_GATEWAY_IP)) { | |
960035b2 | 1191 | bnc_is_valid_nexthop = |
1bb550b6 PG |
1192 | bgp_isvalid_nexthop_for_mpls(bnc, path) ? true |
1193 | : false; | |
960035b2 | 1194 | } else { |
e7cbe5e5 NT |
1195 | if (bgp_update_martian_nexthop( |
1196 | bnc->bgp, afi, safi, path->type, | |
9bcb3eef | 1197 | path->sub_type, path->attr, dest)) { |
e7cbe5e5 NT |
1198 | if (BGP_DEBUG(nht, NHT)) |
1199 | zlog_debug( | |
56ca3b5b | 1200 | "%s: prefix %pBD (vrf %s), ignoring path due to martian or self-next-hop", |
9bcb3eef | 1201 | __func__, dest, bgp_path->name); |
e7cbe5e5 NT |
1202 | } else |
1203 | bnc_is_valid_nexthop = | |
34ea39b6 | 1204 | bgp_isvalid_nexthop(bnc) ? true : false; |
960035b2 PZ |
1205 | } |
1206 | ||
9e15d76a | 1207 | if (BGP_DEBUG(nht, NHT)) { |
c4f64ea9 | 1208 | if (dest->pdest) |
9e15d76a | 1209 | zlog_debug( |
c4f64ea9 DA |
1210 | "... eval path %d/%d %pBD RD %pRD %s flags 0x%x", |
1211 | afi, safi, dest, | |
1212 | (struct prefix_rd *)bgp_dest_get_prefix( | |
1213 | dest->pdest), | |
9e15d76a | 1214 | bgp_path->name_pretty, path->flags); |
c4f64ea9 | 1215 | else |
9e15d76a | 1216 | zlog_debug( |
56ca3b5b | 1217 | "... eval path %d/%d %pBD %s flags 0x%x", |
9bcb3eef | 1218 | afi, safi, dest, bgp_path->name_pretty, |
9e15d76a | 1219 | path->flags); |
1220 | } | |
d62a17ae | 1221 | |
0139efe0 | 1222 | /* Skip paths marked for removal or as history. */ |
1223 | if (CHECK_FLAG(path->flags, BGP_PATH_REMOVED) | |
1224 | || CHECK_FLAG(path->flags, BGP_PATH_HISTORY)) | |
1225 | continue; | |
1226 | ||
d62a17ae | 1227 | /* Copy the metric to the path. Will be used for bestpath |
1228 | * computation */ | |
ac2f64d3 | 1229 | bpi_ultimate = bgp_get_imported_bpi_ultimate(path); |
d62a17ae | 1230 | if (bgp_isvalid_nexthop(bnc) && bnc->metric) |
ac2f64d3 | 1231 | (bgp_path_info_extra_get(bpi_ultimate))->igpmetric = |
18ee8310 | 1232 | bnc->metric; |
ac2f64d3 LS |
1233 | else if (bpi_ultimate->extra) |
1234 | bpi_ultimate->extra->igpmetric = 0; | |
d62a17ae | 1235 | |
1236 | if (CHECK_FLAG(bnc->change_flags, BGP_NEXTHOP_METRIC_CHANGED) | |
545aeef1 RW |
1237 | || CHECK_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED) |
1238 | || path->attr->srte_color != 0) | |
1defdda8 | 1239 | SET_FLAG(path->flags, BGP_PATH_IGP_CHANGED); |
d62a17ae | 1240 | |
d4980edf | 1241 | path_valid = CHECK_FLAG(path->flags, BGP_PATH_VALID); |
34ea39b6 | 1242 | if (path_valid != bnc_is_valid_nexthop) { |
1243 | if (path_valid) { | |
1244 | /* No longer valid, clear flag; also for EVPN | |
1245 | * routes, unimport from VRFs if needed. | |
1246 | */ | |
1247 | bgp_aggregate_decrement(bgp_path, p, path, afi, | |
1248 | safi); | |
9bcb3eef | 1249 | bgp_path_info_unset_flag(dest, path, |
34ea39b6 | 1250 | BGP_PATH_VALID); |
1251 | if (safi == SAFI_EVPN && | |
9bcb3eef | 1252 | bgp_evpn_is_prefix_nht_supported(bgp_dest_get_prefix(dest))) |
34ea39b6 | 1253 | bgp_evpn_unimport_route(bgp_path, |
9bcb3eef | 1254 | afi, safi, bgp_dest_get_prefix(dest), path); |
34ea39b6 | 1255 | } else { |
1256 | /* Path becomes valid, set flag; also for EVPN | |
1257 | * routes, import from VRFs if needed. | |
1258 | */ | |
9bcb3eef | 1259 | bgp_path_info_set_flag(dest, path, |
34ea39b6 | 1260 | BGP_PATH_VALID); |
1261 | bgp_aggregate_increment(bgp_path, p, path, afi, | |
1262 | safi); | |
1263 | if (safi == SAFI_EVPN && | |
9bcb3eef | 1264 | bgp_evpn_is_prefix_nht_supported(bgp_dest_get_prefix(dest))) |
34ea39b6 | 1265 | bgp_evpn_import_route(bgp_path, |
9bcb3eef | 1266 | afi, safi, bgp_dest_get_prefix(dest), path); |
34ea39b6 | 1267 | } |
7c312383 AD |
1268 | } |
1269 | ||
9bcb3eef | 1270 | bgp_process(bgp_path, dest, afi, safi); |
d62a17ae | 1271 | } |
fc9a856f | 1272 | |
1e91f1d1 DS |
1273 | if (peer) { |
1274 | int valid_nexthops = bgp_isvalid_nexthop(bnc); | |
1275 | ||
824065c4 DS |
1276 | if (valid_nexthops) { |
1277 | /* | |
1278 | * Peering cannot occur across a blackhole nexthop | |
1279 | */ | |
e817f2cc | 1280 | if (bnc->nexthop_num == 1 && bnc->nexthop |
824065c4 DS |
1281 | && bnc->nexthop->type == NEXTHOP_TYPE_BLACKHOLE) { |
1282 | peer->last_reset = PEER_DOWN_WAITING_NHT; | |
1283 | valid_nexthops = 0; | |
1284 | } else | |
1285 | peer->last_reset = PEER_DOWN_WAITING_OPEN; | |
1286 | } else | |
1e91f1d1 DS |
1287 | peer->last_reset = PEER_DOWN_WAITING_NHT; |
1288 | ||
1289 | if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED)) { | |
1290 | if (BGP_DEBUG(nht, NHT)) | |
15569c58 | 1291 | zlog_debug( |
8761cd6d | 1292 | "%s: Updating peer (%s(%s)) status with NHT nexthops %d", |
15569c58 | 1293 | __func__, peer->host, |
8761cd6d DS |
1294 | peer->bgp->name_pretty, |
1295 | !!valid_nexthops); | |
f8dcd38d | 1296 | bgp_fsm_nht_update(peer, !!valid_nexthops); |
1e91f1d1 DS |
1297 | SET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); |
1298 | } | |
d62a17ae | 1299 | } |
fc9a856f | 1300 | |
d62a17ae | 1301 | RESET_FLAG(bnc->change_flags); |
fb018d25 DS |
1302 | } |
1303 | ||
1304 | /** | |
1305 | * path_nh_map - make or break path-to-nexthop association. | |
1306 | * ARGUMENTS: | |
1307 | * path - pointer to the path structure | |
1308 | * bnc - pointer to the nexthop structure | |
1309 | * make - if set, make the association. if unset, just break the existing | |
1310 | * association. | |
1311 | */ | |
7f040da1 DS |
1312 | void path_nh_map(struct bgp_path_info *path, struct bgp_nexthop_cache *bnc, |
1313 | bool make) | |
fb018d25 | 1314 | { |
d62a17ae | 1315 | if (path->nexthop) { |
1316 | LIST_REMOVE(path, nh_thread); | |
1317 | path->nexthop->path_count--; | |
1318 | path->nexthop = NULL; | |
1319 | } | |
1320 | if (make) { | |
1321 | LIST_INSERT_HEAD(&(bnc->paths), path, nh_thread); | |
1322 | path->nexthop = bnc; | |
1323 | path->nexthop->path_count++; | |
1324 | } | |
fb018d25 | 1325 | } |
1ee0a2df DS |
1326 | |
1327 | /* | |
1328 | * This function is called to register nexthops to zebra | |
1329 | * as that we may have tried to install the nexthops | |
1330 | * before we actually have a zebra connection | |
1331 | */ | |
1332 | void bgp_nht_register_nexthops(struct bgp *bgp) | |
1333 | { | |
f663c581 RW |
1334 | for (afi_t afi = AFI_IP; afi < AFI_MAX; afi++) { |
1335 | struct bgp_nexthop_cache *bnc; | |
1ee0a2df | 1336 | |
f663c581 RW |
1337 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], |
1338 | bnc) { | |
23f60ffd | 1339 | register_zebra_rnh(bnc); |
1ee0a2df DS |
1340 | } |
1341 | } | |
1342 | } | |
1ea03b90 | 1343 | |
b3a3290e | 1344 | void bgp_nht_reg_enhe_cap_intfs(struct peer *peer) |
1ea03b90 DS |
1345 | { |
1346 | struct bgp *bgp; | |
1ea03b90 DS |
1347 | struct bgp_nexthop_cache *bnc; |
1348 | struct nexthop *nhop; | |
1349 | struct interface *ifp; | |
1350 | struct prefix p; | |
35aae5c9 | 1351 | ifindex_t ifindex = 0; |
1ea03b90 DS |
1352 | |
1353 | if (peer->ifp) | |
1354 | return; | |
1355 | ||
1356 | bgp = peer->bgp; | |
1ea03b90 | 1357 | if (!sockunion2hostprefix(&peer->su, &p)) { |
b3a3290e DS |
1358 | zlog_warn("%s: Unable to convert sockunion to prefix for %s", |
1359 | __func__, peer->host); | |
1ea03b90 DS |
1360 | return; |
1361 | } | |
1362 | ||
1363 | if (p.family != AF_INET6) | |
1364 | return; | |
35aae5c9 DS |
1365 | /* |
1366 | * Gather the ifindex for if up/down events to be | |
1367 | * tagged into this fun | |
1368 | */ | |
1369 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
1370 | ifindex = peer->su.sin6.sin6_scope_id; | |
1ea03b90 | 1371 | |
35aae5c9 | 1372 | bnc = bnc_find(&bgp->nexthop_cache_table[AFI_IP6], &p, 0, ifindex); |
1ea03b90 DS |
1373 | if (!bnc) |
1374 | return; | |
1375 | ||
1376 | if (peer != bnc->nht_info) | |
1377 | return; | |
1378 | ||
1379 | for (nhop = bnc->nexthop; nhop; nhop = nhop->next) { | |
8c9769e0 DS |
1380 | ifp = if_lookup_by_index(nhop->ifindex, nhop->vrf_id); |
1381 | ||
1382 | if (!ifp) | |
1383 | continue; | |
1384 | ||
1ea03b90 DS |
1385 | zclient_send_interface_radv_req(zclient, |
1386 | nhop->vrf_id, | |
1387 | ifp, true, | |
1388 | BGP_UNNUM_DEFAULT_RA_INTERVAL); | |
1389 | } | |
1390 | } | |
b3a3290e DS |
1391 | |
1392 | void bgp_nht_dereg_enhe_cap_intfs(struct peer *peer) | |
1393 | { | |
1394 | struct bgp *bgp; | |
b3a3290e DS |
1395 | struct bgp_nexthop_cache *bnc; |
1396 | struct nexthop *nhop; | |
1397 | struct interface *ifp; | |
1398 | struct prefix p; | |
35aae5c9 | 1399 | ifindex_t ifindex = 0; |
b3a3290e DS |
1400 | |
1401 | if (peer->ifp) | |
1402 | return; | |
1403 | ||
1404 | bgp = peer->bgp; | |
1405 | ||
b3a3290e DS |
1406 | if (!sockunion2hostprefix(&peer->su, &p)) { |
1407 | zlog_warn("%s: Unable to convert sockunion to prefix for %s", | |
1408 | __func__, peer->host); | |
1409 | return; | |
1410 | } | |
1411 | ||
1412 | if (p.family != AF_INET6) | |
1413 | return; | |
35aae5c9 DS |
1414 | /* |
1415 | * Gather the ifindex for if up/down events to be | |
1416 | * tagged into this fun | |
1417 | */ | |
1418 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
1419 | ifindex = peer->su.sin6.sin6_scope_id; | |
b3a3290e | 1420 | |
35aae5c9 | 1421 | bnc = bnc_find(&bgp->nexthop_cache_table[AFI_IP6], &p, 0, ifindex); |
b3a3290e DS |
1422 | if (!bnc) |
1423 | return; | |
1424 | ||
1425 | if (peer != bnc->nht_info) | |
1426 | return; | |
1427 | ||
1428 | for (nhop = bnc->nexthop; nhop; nhop = nhop->next) { | |
1429 | ifp = if_lookup_by_index(nhop->ifindex, nhop->vrf_id); | |
1430 | ||
68cecc3b DS |
1431 | if (!ifp) |
1432 | continue; | |
1433 | ||
b3a3290e DS |
1434 | zclient_send_interface_radv_req(zclient, nhop->vrf_id, ifp, 0, |
1435 | 0); | |
1436 | } | |
1437 | } | |
c589d847 AK |
1438 | |
1439 | /**************************************************************************** | |
1440 | * L3 NHGs are used for fast failover of nexthops in the dplane. These are | |
1441 | * the APIs for allocating L3 NHG ids. Management of the L3 NHG itself is | |
1442 | * left to the application using it. | |
1443 | * PS: Currently EVPN host routes is the only app using L3 NHG for fast | |
1444 | * failover of remote ES links. | |
1445 | ***************************************************************************/ | |
1446 | static bitfield_t bgp_nh_id_bitmap; | |
8bcb09a1 | 1447 | static uint32_t bgp_l3nhg_start; |
c589d847 | 1448 | |
8bcb09a1 AK |
1449 | /* XXX - currently we do nothing on the callbacks */ |
1450 | static void bgp_l3nhg_add_cb(const char *name) | |
1451 | { | |
1452 | } | |
f3c6dd49 DS |
1453 | |
1454 | static void bgp_l3nhg_modify_cb(const struct nexthop_group_cmd *nhgc) | |
1455 | { | |
1456 | } | |
1457 | ||
8bcb09a1 AK |
1458 | static void bgp_l3nhg_add_nexthop_cb(const struct nexthop_group_cmd *nhgc, |
1459 | const struct nexthop *nhop) | |
1460 | { | |
1461 | } | |
f3c6dd49 | 1462 | |
8bcb09a1 AK |
1463 | static void bgp_l3nhg_del_nexthop_cb(const struct nexthop_group_cmd *nhgc, |
1464 | const struct nexthop *nhop) | |
1465 | { | |
1466 | } | |
f3c6dd49 | 1467 | |
8bcb09a1 | 1468 | static void bgp_l3nhg_del_cb(const char *name) |
c589d847 | 1469 | { |
c589d847 AK |
1470 | } |
1471 | ||
8bcb09a1 | 1472 | static void bgp_l3nhg_zebra_init(void) |
c589d847 | 1473 | { |
8bcb09a1 AK |
1474 | static bool bgp_l3nhg_zebra_inited; |
1475 | if (bgp_l3nhg_zebra_inited) | |
c589d847 AK |
1476 | return; |
1477 | ||
8bcb09a1 AK |
1478 | bgp_l3nhg_zebra_inited = true; |
1479 | bgp_l3nhg_start = zclient_get_nhg_start(ZEBRA_ROUTE_BGP); | |
f3c6dd49 DS |
1480 | nexthop_group_init(bgp_l3nhg_add_cb, bgp_l3nhg_modify_cb, |
1481 | bgp_l3nhg_add_nexthop_cb, bgp_l3nhg_del_nexthop_cb, | |
1482 | bgp_l3nhg_del_cb); | |
c589d847 AK |
1483 | } |
1484 | ||
8bcb09a1 | 1485 | |
c589d847 AK |
1486 | void bgp_l3nhg_init(void) |
1487 | { | |
8bcb09a1 AK |
1488 | uint32_t id_max; |
1489 | ||
7a8ce9d5 | 1490 | id_max = MIN(ZEBRA_NHG_PROTO_SPACING - 1, 16 * 1024); |
8bcb09a1 | 1491 | bf_init(bgp_nh_id_bitmap, id_max); |
c589d847 | 1492 | bf_assign_zero_index(bgp_nh_id_bitmap); |
8bcb09a1 AK |
1493 | |
1494 | if (BGP_DEBUG(nht, NHT) || BGP_DEBUG(evpn_mh, EVPN_MH_ES)) | |
1495 | zlog_debug("bgp l3_nhg range %u - %u", bgp_l3nhg_start + 1, | |
1496 | bgp_l3nhg_start + id_max); | |
c589d847 AK |
1497 | } |
1498 | ||
1499 | void bgp_l3nhg_finish(void) | |
1500 | { | |
1501 | bf_free(bgp_nh_id_bitmap); | |
1502 | } | |
8bcb09a1 AK |
1503 | |
1504 | uint32_t bgp_l3nhg_id_alloc(void) | |
1505 | { | |
1506 | uint32_t nhg_id = 0; | |
1507 | ||
1508 | bgp_l3nhg_zebra_init(); | |
1509 | bf_assign_index(bgp_nh_id_bitmap, nhg_id); | |
1510 | if (nhg_id) | |
1511 | nhg_id += bgp_l3nhg_start; | |
1512 | ||
1513 | return nhg_id; | |
1514 | } | |
1515 | ||
1516 | void bgp_l3nhg_id_free(uint32_t nhg_id) | |
1517 | { | |
1518 | if (!nhg_id || (nhg_id <= bgp_l3nhg_start)) | |
1519 | return; | |
1520 | ||
1521 | nhg_id -= bgp_l3nhg_start; | |
1522 | ||
1523 | bf_release_index(bgp_nh_id_bitmap, nhg_id); | |
1524 | } |