]>
Commit | Line | Data |
---|---|---|
acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fb018d25 DS |
2 | /* BGP Nexthop tracking |
3 | * Copyright (C) 2013 Cumulus Networks, Inc. | |
fb018d25 DS |
4 | */ |
5 | ||
6 | #include <zebra.h> | |
7 | ||
8 | #include "command.h" | |
24a58196 | 9 | #include "frrevent.h" |
fb018d25 DS |
10 | #include "prefix.h" |
11 | #include "zclient.h" | |
12 | #include "stream.h" | |
13 | #include "network.h" | |
14 | #include "log.h" | |
15 | #include "memory.h" | |
16 | #include "nexthop.h" | |
7076bb2f | 17 | #include "vrf.h" |
039f3a34 | 18 | #include "filter.h" |
8bcb09a1 | 19 | #include "nexthop_group.h" |
fb018d25 DS |
20 | |
21 | #include "bgpd/bgpd.h" | |
22 | #include "bgpd/bgp_table.h" | |
23 | #include "bgpd/bgp_route.h" | |
24 | #include "bgpd/bgp_attr.h" | |
25 | #include "bgpd/bgp_nexthop.h" | |
26 | #include "bgpd/bgp_debug.h" | |
14454c9f | 27 | #include "bgpd/bgp_errors.h" |
fb018d25 | 28 | #include "bgpd/bgp_nht.h" |
ffd0c037 | 29 | #include "bgpd/bgp_fsm.h" |
afbb1c59 | 30 | #include "bgpd/bgp_zebra.h" |
0378bcaa | 31 | #include "bgpd/bgp_flowspec_util.h" |
7c312383 | 32 | #include "bgpd/bgp_evpn.h" |
9e15d76a | 33 | #include "bgpd/bgp_rd.h" |
fb018d25 DS |
34 | |
35 | extern struct zclient *zclient; | |
fb018d25 | 36 | |
23f60ffd DA |
37 | static void register_zebra_rnh(struct bgp_nexthop_cache *bnc); |
38 | static void unregister_zebra_rnh(struct bgp_nexthop_cache *bnc); | |
40381db7 | 39 | static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p); |
e6685141 | 40 | static void bgp_nht_ifp_initial(struct event *thread); |
fb018d25 | 41 | |
d62a17ae | 42 | static int bgp_isvalid_nexthop(struct bgp_nexthop_cache *bnc) |
d4d9d757 | 43 | { |
d62a17ae | 44 | return (bgp_zebra_num_connects() == 0 |
c3b95419 EDP |
45 | || (bnc && CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID) |
46 | && bnc->nexthop_num > 0)); | |
d4d9d757 LB |
47 | } |
48 | ||
4cd690ae PG |
49 | static int bgp_isvalid_nexthop_for_ebgp(struct bgp_nexthop_cache *bnc, |
50 | struct bgp_path_info *path) | |
51 | { | |
52 | struct interface *ifp = NULL; | |
53 | struct nexthop *nexthop; | |
54 | struct bgp_interface *iifp; | |
55 | struct peer *peer; | |
56 | ||
57 | if (!path->extra || !path->extra->peer_orig) | |
58 | return false; | |
59 | ||
60 | peer = path->extra->peer_orig; | |
61 | ||
62 | /* only connected ebgp peers are valid */ | |
63 | if (peer->sort != BGP_PEER_EBGP || peer->ttl != BGP_DEFAULT_TTL || | |
64 | CHECK_FLAG(peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK) || | |
65 | CHECK_FLAG(peer->bgp->flags, BGP_FLAG_DISABLE_NH_CONNECTED_CHK)) | |
66 | return false; | |
67 | ||
68 | for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next) { | |
69 | if (nexthop->type == NEXTHOP_TYPE_IFINDEX || | |
70 | nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX || | |
71 | nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) { | |
72 | ifp = if_lookup_by_index( | |
73 | bnc->ifindex ? bnc->ifindex : nexthop->ifindex, | |
74 | bnc->bgp->vrf_id); | |
75 | } | |
76 | if (!ifp) | |
77 | continue; | |
78 | iifp = ifp->info; | |
79 | if (CHECK_FLAG(iifp->flags, BGP_INTERFACE_MPLS_BGP_FORWARDING)) | |
80 | return true; | |
81 | } | |
82 | return false; | |
83 | } | |
84 | ||
1bb550b6 PG |
85 | static int bgp_isvalid_nexthop_for_mplsovergre(struct bgp_nexthop_cache *bnc, |
86 | struct bgp_path_info *path) | |
87 | { | |
88 | struct interface *ifp = NULL; | |
89 | struct nexthop *nexthop; | |
90 | ||
91 | for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next) { | |
92 | if (nexthop->type != NEXTHOP_TYPE_BLACKHOLE) { | |
93 | ifp = if_lookup_by_index( | |
94 | bnc->ifindex ? bnc->ifindex : nexthop->ifindex, | |
95 | bnc->bgp->vrf_id); | |
96 | if (ifp && (ifp->ll_type == ZEBRA_LLT_IPGRE || | |
97 | ifp->ll_type == ZEBRA_LLT_IP6GRE)) | |
98 | break; | |
99 | } | |
100 | } | |
101 | if (!ifp) | |
102 | return false; | |
103 | ||
104 | if (CHECK_FLAG(path->attr->rmap_change_flags, | |
105 | BATTR_RMAP_L3VPN_ACCEPT_GRE)) | |
106 | return true; | |
107 | ||
108 | return false; | |
109 | } | |
110 | ||
111 | static int bgp_isvalid_nexthop_for_mpls(struct bgp_nexthop_cache *bnc, | |
112 | struct bgp_path_info *path) | |
960035b2 | 113 | { |
7f8c7d91 | 114 | /* |
1bb550b6 | 115 | * - In the case of MPLS-VPN, the label is learned from LDP or other |
7f8c7d91 HS |
116 | * protocols, and nexthop tracking is enabled for the label. |
117 | * The value is recorded as BGP_NEXTHOP_LABELED_VALID. | |
1bb550b6 | 118 | * - In the case of SRv6-VPN, we need to track the reachability to the |
7f8c7d91 HS |
119 | * SID (in other words, IPv6 address). As in MPLS, we need to record |
120 | * the value as BGP_NEXTHOP_SID_VALID. However, this function is | |
121 | * currently not implemented, and this function assumes that all | |
122 | * Transit routes for SRv6-VPN are valid. | |
1bb550b6 | 123 | * - Otherwise check for mpls-gre acceptance |
7f8c7d91 | 124 | */ |
1bb550b6 PG |
125 | return (bgp_zebra_num_connects() == 0 || |
126 | (bnc && (bnc->nexthop_num > 0 && | |
46dbf9d0 DA |
127 | (CHECK_FLAG(path->flags, BGP_PATH_ACCEPT_OWN) || |
128 | CHECK_FLAG(bnc->flags, BGP_NEXTHOP_LABELED_VALID) || | |
1bb550b6 | 129 | bnc->bgp->srv6_enabled || |
4cd690ae | 130 | bgp_isvalid_nexthop_for_ebgp(bnc, path) || |
1bb550b6 | 131 | bgp_isvalid_nexthop_for_mplsovergre(bnc, path))))); |
960035b2 PZ |
132 | } |
133 | ||
d62a17ae | 134 | static void bgp_unlink_nexthop_check(struct bgp_nexthop_cache *bnc) |
fb018d25 | 135 | { |
d5c4bac9 | 136 | if (LIST_EMPTY(&(bnc->paths)) && !bnc->nht_info) { |
036f482f DA |
137 | if (BGP_DEBUG(nht, NHT)) |
138 | zlog_debug("%s: freeing bnc %pFX(%d)(%u)(%s)", __func__, | |
139 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 140 | bnc->bgp->name_pretty); |
e37e1e27 PR |
141 | /* only unregister if this is the last nh for this prefix*/ |
142 | if (!bnc_existing_for_prefix(bnc)) | |
23f60ffd | 143 | unregister_zebra_rnh(bnc); |
d62a17ae | 144 | bnc_free(bnc); |
fb018d25 | 145 | } |
fb018d25 DS |
146 | } |
147 | ||
4b7e6066 | 148 | void bgp_unlink_nexthop(struct bgp_path_info *path) |
f9164b1d | 149 | { |
d62a17ae | 150 | struct bgp_nexthop_cache *bnc = path->nexthop; |
151 | ||
152 | if (!bnc) | |
153 | return; | |
f9164b1d | 154 | |
7f040da1 | 155 | path_nh_map(path, NULL, false); |
f9164b1d | 156 | |
d62a17ae | 157 | bgp_unlink_nexthop_check(bnc); |
f9164b1d PJ |
158 | } |
159 | ||
996319e6 DS |
160 | void bgp_replace_nexthop_by_peer(struct peer *from, struct peer *to) |
161 | { | |
162 | struct prefix pp; | |
163 | struct prefix pt; | |
164 | struct bgp_nexthop_cache *bncp, *bnct; | |
165 | afi_t afi; | |
35aae5c9 | 166 | ifindex_t ifindex = 0; |
996319e6 DS |
167 | |
168 | if (!sockunion2hostprefix(&from->su, &pp)) | |
169 | return; | |
170 | ||
35aae5c9 DS |
171 | /* |
172 | * Gather the ifindex for if up/down events to be | |
173 | * tagged into this fun | |
174 | */ | |
175 | if (from->conf_if && IN6_IS_ADDR_LINKLOCAL(&from->su.sin6.sin6_addr)) | |
176 | ifindex = from->su.sin6.sin6_scope_id; | |
177 | ||
996319e6 | 178 | afi = family2afi(pp.family); |
35aae5c9 | 179 | bncp = bnc_find(&from->bgp->nexthop_cache_table[afi], &pp, 0, ifindex); |
996319e6 DS |
180 | |
181 | if (!sockunion2hostprefix(&to->su, &pt)) | |
182 | return; | |
183 | ||
35aae5c9 DS |
184 | /* |
185 | * Gather the ifindex for if up/down events to be | |
186 | * tagged into this fun | |
187 | */ | |
188 | ifindex = 0; | |
189 | if (to->conf_if && IN6_IS_ADDR_LINKLOCAL(&to->su.sin6.sin6_addr)) | |
190 | ifindex = to->su.sin6.sin6_scope_id; | |
191 | bnct = bnc_find(&to->bgp->nexthop_cache_table[afi], &pt, 0, ifindex); | |
996319e6 DS |
192 | |
193 | if (bnct != bncp) | |
194 | return; | |
195 | ||
196 | if (bnct) | |
197 | bnct->nht_info = to; | |
198 | } | |
199 | ||
51f3216b PJD |
200 | /* |
201 | * Returns the bnc whose bnc->nht_info matches the LL peer by | |
202 | * looping through the IPv6 nexthop table | |
203 | */ | |
204 | static struct bgp_nexthop_cache * | |
205 | bgp_find_ipv6_nexthop_matching_peer(struct peer *peer) | |
206 | { | |
207 | struct bgp_nexthop_cache *bnc; | |
208 | ||
209 | frr_each (bgp_nexthop_cache, &peer->bgp->nexthop_cache_table[AFI_IP6], | |
210 | bnc) { | |
211 | if (bnc->nht_info == peer) { | |
212 | if (BGP_DEBUG(nht, NHT)) { | |
213 | zlog_debug( | |
214 | "Found bnc: %pFX(%u)(%u)(%p) for peer: %s(%s) %p", | |
215 | &bnc->prefix, bnc->ifindex, | |
216 | bnc->srte_color, bnc, peer->host, | |
217 | peer->bgp->name_pretty, peer); | |
218 | } | |
219 | return bnc; | |
220 | } | |
221 | } | |
222 | ||
223 | if (BGP_DEBUG(nht, NHT)) | |
224 | zlog_debug( | |
225 | "Could not find bnc for peer %s(%s) %p in v6 nexthop table", | |
226 | peer->host, peer->bgp->name_pretty, peer); | |
227 | ||
228 | return NULL; | |
229 | } | |
230 | ||
d62a17ae | 231 | void bgp_unlink_nexthop_by_peer(struct peer *peer) |
f9164b1d | 232 | { |
d62a17ae | 233 | struct prefix p; |
d62a17ae | 234 | struct bgp_nexthop_cache *bnc; |
235 | afi_t afi = family2afi(peer->su.sa.sa_family); | |
35aae5c9 | 236 | ifindex_t ifindex = 0; |
d62a17ae | 237 | |
51f3216b PJD |
238 | if (!sockunion2hostprefix(&peer->su, &p)) { |
239 | /* | |
240 | * In scenarios where unnumbered BGP session is brought | |
241 | * down by shutting down the interface before unconfiguring | |
242 | * the BGP neighbor, neighbor information in peer->su.sa | |
243 | * will be cleared when the interface is shutdown. So | |
244 | * during the deletion of unnumbered bgp peer, above check | |
245 | * will return true. Therefore, in this case,BGP needs to | |
246 | * find the bnc whose bnc->nht_info matches the | |
247 | * peer being deleted and free it. | |
248 | */ | |
249 | bnc = bgp_find_ipv6_nexthop_matching_peer(peer); | |
250 | } else { | |
251 | /* | |
252 | * Gather the ifindex for if up/down events to be | |
253 | * tagged into this fun | |
254 | */ | |
255 | if (afi == AFI_IP6 && | |
256 | IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
257 | ifindex = peer->su.sin6.sin6_scope_id; | |
258 | bnc = bnc_find(&peer->bgp->nexthop_cache_table[afi], &p, 0, | |
259 | ifindex); | |
260 | } | |
261 | ||
14315f2d | 262 | if (!bnc) |
d62a17ae | 263 | return; |
264 | ||
d62a17ae | 265 | /* cleanup the peer reference */ |
266 | bnc->nht_info = NULL; | |
267 | ||
268 | bgp_unlink_nexthop_check(bnc); | |
f9164b1d PJ |
269 | } |
270 | ||
960035b2 PZ |
271 | /* |
272 | * A route and its nexthop might belong to different VRFs. Therefore, | |
273 | * we need both the bgp_route and bgp_nexthop pointers. | |
274 | */ | |
275 | int bgp_find_or_add_nexthop(struct bgp *bgp_route, struct bgp *bgp_nexthop, | |
4053e952 | 276 | afi_t afi, safi_t safi, struct bgp_path_info *pi, |
654a5978 PG |
277 | struct peer *peer, int connected, |
278 | const struct prefix *orig_prefix) | |
fb018d25 | 279 | { |
f663c581 | 280 | struct bgp_nexthop_cache_head *tree = NULL; |
d62a17ae | 281 | struct bgp_nexthop_cache *bnc; |
ac2f64d3 | 282 | struct bgp_path_info *bpi_ultimate; |
d62a17ae | 283 | struct prefix p; |
545aeef1 | 284 | uint32_t srte_color = 0; |
d62a17ae | 285 | int is_bgp_static_route = 0; |
8761cd6d | 286 | ifindex_t ifindex = 0; |
d62a17ae | 287 | |
40381db7 DS |
288 | if (pi) { |
289 | is_bgp_static_route = ((pi->type == ZEBRA_ROUTE_BGP) | |
290 | && (pi->sub_type == BGP_ROUTE_STATIC)) | |
d62a17ae | 291 | ? 1 |
292 | : 0; | |
293 | ||
294 | /* Since Extended Next-hop Encoding (RFC5549) support, we want | |
295 | to derive | |
296 | address-family from the next-hop. */ | |
297 | if (!is_bgp_static_route) | |
7226bc40 TA |
298 | afi = BGP_ATTR_MP_NEXTHOP_LEN_IP6(pi->attr) ? AFI_IP6 |
299 | : AFI_IP; | |
d62a17ae | 300 | |
92d6f769 K |
301 | /* Validation for the ipv4 mapped ipv6 nexthop. */ |
302 | if (IS_MAPPED_IPV6(&pi->attr->mp_nexthop_global)) { | |
303 | afi = AFI_IP; | |
304 | } | |
305 | ||
2951a7a4 | 306 | /* This will return true if the global IPv6 NH is a link local |
d62a17ae | 307 | * addr */ |
40381db7 | 308 | if (make_prefix(afi, pi, &p) < 0) |
d62a17ae | 309 | return 1; |
545aeef1 | 310 | |
654a5978 PG |
311 | if (!is_bgp_static_route && orig_prefix |
312 | && prefix_same(&p, orig_prefix)) { | |
313 | if (BGP_DEBUG(nht, NHT)) { | |
314 | zlog_debug( | |
315 | "%s(%pFX): prefix loops through itself", | |
316 | __func__, &p); | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
545aeef1 | 321 | srte_color = pi->attr->srte_color; |
d62a17ae | 322 | } else if (peer) { |
8761cd6d DS |
323 | /* |
324 | * Gather the ifindex for if up/down events to be | |
325 | * tagged into this fun | |
326 | */ | |
e9ad26e5 | 327 | if (afi == AFI_IP6 && peer->conf_if && |
35aae5c9 | 328 | IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) { |
8761cd6d | 329 | ifindex = peer->su.sin6.sin6_scope_id; |
35aae5c9 DS |
330 | if (ifindex == 0) { |
331 | if (BGP_DEBUG(nht, NHT)) { | |
332 | zlog_debug( | |
333 | "%s: Unable to locate ifindex, waiting till we have one", | |
334 | peer->conf_if); | |
335 | } | |
336 | return 0; | |
337 | } | |
338 | } | |
8761cd6d | 339 | |
d62a17ae | 340 | if (!sockunion2hostprefix(&peer->su, &p)) { |
341 | if (BGP_DEBUG(nht, NHT)) { | |
342 | zlog_debug( | |
343 | "%s: Attempting to register with unknown AFI %d (not %d or %d)", | |
15569c58 | 344 | __func__, afi, AFI_IP, AFI_IP6); |
d62a17ae | 345 | } |
346 | return 0; | |
347 | } | |
348 | } else | |
349 | return 0; | |
350 | ||
351 | if (is_bgp_static_route) | |
f663c581 | 352 | tree = &bgp_nexthop->import_check_table[afi]; |
d62a17ae | 353 | else |
f663c581 | 354 | tree = &bgp_nexthop->nexthop_cache_table[afi]; |
d62a17ae | 355 | |
35aae5c9 | 356 | bnc = bnc_find(tree, &p, srte_color, ifindex); |
14315f2d | 357 | if (!bnc) { |
35aae5c9 | 358 | bnc = bnc_new(tree, &p, srte_color, ifindex); |
960035b2 | 359 | bnc->bgp = bgp_nexthop; |
036f482f DA |
360 | if (BGP_DEBUG(nht, NHT)) |
361 | zlog_debug("Allocated bnc %pFX(%d)(%u)(%s) peer %p", | |
362 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 363 | bnc->bgp->name_pretty, peer); |
4115b296 | 364 | } else { |
036f482f | 365 | if (BGP_DEBUG(nht, NHT)) |
4115b296 | 366 | zlog_debug( |
036f482f DA |
367 | "Found existing bnc %pFX(%d)(%s) flags 0x%x ifindex %d #paths %d peer %p", |
368 | &bnc->prefix, bnc->ifindex, | |
369 | bnc->bgp->name_pretty, bnc->flags, bnc->ifindex, | |
370 | bnc->path_count, bnc->nht_info); | |
fc9a856f | 371 | } |
d62a17ae | 372 | |
021b6596 AD |
373 | if (pi && is_route_parent_evpn(pi)) |
374 | bnc->is_evpn_gwip_nexthop = true; | |
375 | ||
2bb8b49c | 376 | if (is_bgp_static_route) { |
d62a17ae | 377 | SET_FLAG(bnc->flags, BGP_STATIC_ROUTE); |
378 | ||
379 | /* If we're toggling the type, re-register */ | |
892fedb6 | 380 | if ((CHECK_FLAG(bgp_route->flags, BGP_FLAG_IMPORT_CHECK)) |
d62a17ae | 381 | && !CHECK_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH)) { |
382 | SET_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH); | |
383 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
384 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
892fedb6 DA |
385 | } else if ((!CHECK_FLAG(bgp_route->flags, |
386 | BGP_FLAG_IMPORT_CHECK)) | |
d62a17ae | 387 | && CHECK_FLAG(bnc->flags, |
388 | BGP_STATIC_ROUTE_EXACT_MATCH)) { | |
389 | UNSET_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH); | |
390 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
391 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
392 | } | |
078430f6 | 393 | } |
d62a17ae | 394 | /* When nexthop is already known, but now requires 'connected' |
395 | * resolution, | |
396 | * re-register it. The reverse scenario where the nexthop currently | |
397 | * requires | |
398 | * 'connected' resolution does not need a re-register (i.e., we treat | |
399 | * 'connected-required' as an override) except in the scenario where | |
400 | * this | |
401 | * is actually a case of tracking a peer for connectivity (e.g., after | |
402 | * disable connected-check). | |
403 | * NOTE: We don't track the number of paths separately for 'connected- | |
404 | * required' vs 'connected-not-required' as this change is not a common | |
405 | * scenario. | |
406 | */ | |
407 | else if (connected && !CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) { | |
408 | SET_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED); | |
409 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
410 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
2bb8b49c DS |
411 | } else if (peer && !connected |
412 | && CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) { | |
d62a17ae | 413 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED); |
414 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
415 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
078430f6 | 416 | } |
4115b296 | 417 | if (peer && (bnc->ifindex != ifindex)) { |
418 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
419 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
420 | bnc->ifindex = ifindex; | |
421 | } | |
960035b2 | 422 | if (bgp_route->inst_type == BGP_INSTANCE_TYPE_VIEW) { |
1ee0a2df DS |
423 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
424 | SET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
b54892e0 | 425 | } else if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED) |
f663c581 | 426 | && !is_default_host_route(&bnc->prefix)) |
23f60ffd | 427 | register_zebra_rnh(bnc); |
1eb6c3ea | 428 | |
40381db7 | 429 | if (pi && pi->nexthop != bnc) { |
d62a17ae | 430 | /* Unlink from existing nexthop cache, if any. This will also |
431 | * free | |
432 | * the nexthop cache entry, if appropriate. | |
433 | */ | |
40381db7 | 434 | bgp_unlink_nexthop(pi); |
d62a17ae | 435 | |
7f040da1 DS |
436 | /* updates NHT pi list reference */ |
437 | path_nh_map(pi, bnc, true); | |
d62a17ae | 438 | |
ac2f64d3 | 439 | bpi_ultimate = bgp_get_imported_bpi_ultimate(pi); |
d62a17ae | 440 | if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID) && bnc->metric) |
ac2f64d3 LS |
441 | (bgp_path_info_extra_get(bpi_ultimate))->igpmetric = |
442 | bnc->metric; | |
443 | else if (bpi_ultimate->extra) | |
444 | bpi_ultimate->extra->igpmetric = 0; | |
996319e6 DS |
445 | } else if (peer) { |
446 | /* | |
4667220e | 447 | * Let's not accidentally save the peer data for a peer |
996319e6 DS |
448 | * we are going to throw away in a second or so. |
449 | * When we come back around we'll fix up this | |
450 | * data properly in replace_nexthop_by_peer | |
451 | */ | |
452 | if (CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
453 | bnc->nht_info = (void *)peer; /* NHT peer reference */ | |
454 | } | |
d62a17ae | 455 | |
456 | /* | |
457 | * We are cheating here. Views have no associated underlying | |
458 | * ability to detect nexthops. So when we have a view | |
459 | * just tell everyone the nexthop is valid | |
460 | */ | |
960035b2 | 461 | if (bgp_route->inst_type == BGP_INSTANCE_TYPE_VIEW) |
d62a17ae | 462 | return 1; |
1bb550b6 PG |
463 | else if (safi == SAFI_UNICAST && pi && |
464 | pi->sub_type == BGP_ROUTE_IMPORTED && pi->extra && | |
465 | pi->extra->num_labels && !bnc->is_evpn_gwip_nexthop) | |
466 | return bgp_isvalid_nexthop_for_mpls(bnc, pi); | |
467 | else | |
d62a17ae | 468 | return (bgp_isvalid_nexthop(bnc)); |
fb018d25 DS |
469 | } |
470 | ||
d62a17ae | 471 | void bgp_delete_connected_nexthop(afi_t afi, struct peer *peer) |
9a233a02 | 472 | { |
d62a17ae | 473 | struct bgp_nexthop_cache *bnc; |
474 | struct prefix p; | |
35aae5c9 | 475 | ifindex_t ifindex = 0; |
d62a17ae | 476 | |
477 | if (!peer) | |
478 | return; | |
479 | ||
51f3216b PJD |
480 | /* |
481 | * In case the below check evaluates true and if | |
482 | * the bnc has not been freed at this point, then | |
483 | * we might have to do something similar to what's | |
484 | * done in bgp_unlink_nexthop_by_peer(). Since | |
485 | * bgp_unlink_nexthop_by_peer() loops through the | |
486 | * nodes of V6 nexthop cache to find the bnc, it is | |
487 | * currently not being called here. | |
488 | */ | |
d62a17ae | 489 | if (!sockunion2hostprefix(&peer->su, &p)) |
490 | return; | |
35aae5c9 DS |
491 | /* |
492 | * Gather the ifindex for if up/down events to be | |
493 | * tagged into this fun | |
494 | */ | |
495 | if (afi == AFI_IP6 && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
496 | ifindex = peer->su.sin6.sin6_scope_id; | |
f663c581 | 497 | bnc = bnc_find(&peer->bgp->nexthop_cache_table[family2afi(p.family)], |
35aae5c9 | 498 | &p, 0, ifindex); |
14315f2d DS |
499 | if (!bnc) { |
500 | if (BGP_DEBUG(nht, NHT)) | |
8c1a4c10 | 501 | zlog_debug( |
f663c581 | 502 | "Cannot find connected NHT node for peer %s(%s)", |
8c1a4c10 | 503 | peer->host, peer->bgp->name_pretty); |
14315f2d DS |
504 | return; |
505 | } | |
d62a17ae | 506 | |
507 | if (bnc->nht_info != peer) { | |
508 | if (BGP_DEBUG(nht, NHT)) | |
509 | zlog_debug( | |
8c1a4c10 DS |
510 | "Connected NHT %p node for peer %s(%s) points to %p", |
511 | bnc, peer->host, bnc->bgp->name_pretty, | |
512 | bnc->nht_info); | |
d62a17ae | 513 | return; |
514 | } | |
515 | ||
516 | bnc->nht_info = NULL; | |
517 | ||
518 | if (LIST_EMPTY(&(bnc->paths))) { | |
519 | if (BGP_DEBUG(nht, NHT)) | |
8c1a4c10 DS |
520 | zlog_debug( |
521 | "Freeing connected NHT node %p for peer %s(%s)", | |
522 | bnc, peer->host, bnc->bgp->name_pretty); | |
23f60ffd | 523 | unregister_zebra_rnh(bnc); |
d62a17ae | 524 | bnc_free(bnc); |
525 | } | |
9a233a02 DS |
526 | } |
527 | ||
545aeef1 | 528 | static void bgp_process_nexthop_update(struct bgp_nexthop_cache *bnc, |
9f002fa5 DS |
529 | struct zapi_route *nhr, |
530 | bool import_check) | |
fb018d25 | 531 | { |
d62a17ae | 532 | struct nexthop *nexthop; |
533 | struct nexthop *oldnh; | |
534 | struct nexthop *nhlist_head = NULL; | |
535 | struct nexthop *nhlist_tail = NULL; | |
d62a17ae | 536 | int i; |
021b6596 | 537 | bool evpn_resolved = false; |
14315f2d | 538 | |
083ec940 | 539 | bnc->last_update = monotime(NULL); |
d62a17ae | 540 | bnc->change_flags = 0; |
d62a17ae | 541 | |
542 | /* debug print the input */ | |
987a720a DS |
543 | if (BGP_DEBUG(nht, NHT)) { |
544 | char bnc_buf[BNC_FLAG_DUMP_SIZE]; | |
545 | ||
d62a17ae | 546 | zlog_debug( |
35aae5c9 | 547 | "%s(%u): Rcvd NH update %pFX(%u)%u) - metric %d/%d #nhops %d/%d flags %s", |
2dbe669b | 548 | bnc->bgp->name_pretty, bnc->bgp->vrf_id, &nhr->prefix, |
35aae5c9 | 549 | bnc->ifindex, bnc->srte_color, nhr->metric, bnc->metric, |
987a720a DS |
550 | nhr->nexthop_num, bnc->nexthop_num, |
551 | bgp_nexthop_dump_bnc_flags(bnc, bnc_buf, | |
552 | sizeof(bnc_buf))); | |
553 | } | |
d62a17ae | 554 | |
545aeef1 | 555 | if (nhr->metric != bnc->metric) |
d62a17ae | 556 | bnc->change_flags |= BGP_NEXTHOP_METRIC_CHANGED; |
557 | ||
545aeef1 | 558 | if (nhr->nexthop_num != bnc->nexthop_num) |
d62a17ae | 559 | bnc->change_flags |= BGP_NEXTHOP_CHANGED; |
560 | ||
9f002fa5 DS |
561 | if (import_check && (nhr->type == ZEBRA_ROUTE_BGP || |
562 | !prefix_same(&bnc->prefix, &nhr->prefix))) { | |
563 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
564 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
565 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_LABELED_VALID); | |
566 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_EVPN_INCOMPLETE); | |
567 | ||
568 | bnc_nexthop_free(bnc); | |
569 | bnc->nexthop = NULL; | |
570 | ||
571 | if (BGP_DEBUG(nht, NHT)) | |
572 | zlog_debug( | |
573 | "%s: Import Check does not resolve to the same prefix for %pFX received %pFX or matching route is BGP", | |
574 | __func__, &bnc->prefix, &nhr->prefix); | |
575 | } else if (nhr->nexthop_num) { | |
6137a77d DS |
576 | struct peer *peer = bnc->nht_info; |
577 | ||
d62a17ae | 578 | /* notify bgp fsm if nbr ip goes from invalid->valid */ |
579 | if (!bnc->nexthop_num) | |
580 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
581 | ||
021b6596 AD |
582 | if (!bnc->is_evpn_gwip_nexthop) |
583 | bnc->flags |= BGP_NEXTHOP_VALID; | |
545aeef1 RW |
584 | bnc->metric = nhr->metric; |
585 | bnc->nexthop_num = nhr->nexthop_num; | |
4a749e2c | 586 | |
960035b2 PZ |
587 | bnc->flags &= ~BGP_NEXTHOP_LABELED_VALID; /* check below */ |
588 | ||
545aeef1 | 589 | for (i = 0; i < nhr->nexthop_num; i++) { |
960035b2 PZ |
590 | int num_labels = 0; |
591 | ||
545aeef1 | 592 | nexthop = nexthop_from_zapi_nexthop(&nhr->nexthops[i]); |
d62a17ae | 593 | |
6137a77d DS |
594 | /* |
595 | * Turn on RA for the v6 nexthops | |
596 | * we receive from bgp. This is to allow us | |
597 | * to work with v4 routing over v6 nexthops | |
598 | */ | |
687a2b5d DS |
599 | if (peer && !peer->ifp |
600 | && CHECK_FLAG(peer->flags, | |
601 | PEER_FLAG_CAPABILITY_ENHE) | |
545aeef1 | 602 | && nhr->prefix.family == AF_INET6 |
65f803e8 | 603 | && nexthop->type != NEXTHOP_TYPE_BLACKHOLE) { |
6137a77d DS |
604 | struct interface *ifp; |
605 | ||
606 | ifp = if_lookup_by_index(nexthop->ifindex, | |
607 | nexthop->vrf_id); | |
8c9769e0 DS |
608 | if (ifp) |
609 | zclient_send_interface_radv_req( | |
610 | zclient, nexthop->vrf_id, ifp, | |
611 | true, | |
612 | BGP_UNNUM_DEFAULT_RA_INTERVAL); | |
6137a77d | 613 | } |
960035b2 PZ |
614 | /* There is at least one label-switched path */ |
615 | if (nexthop->nh_label && | |
616 | nexthop->nh_label->num_labels) { | |
617 | ||
618 | bnc->flags |= BGP_NEXTHOP_LABELED_VALID; | |
619 | num_labels = nexthop->nh_label->num_labels; | |
620 | } | |
621 | ||
d62a17ae | 622 | if (BGP_DEBUG(nht, NHT)) { |
623 | char buf[NEXTHOP_STRLEN]; | |
624 | zlog_debug( | |
960035b2 PZ |
625 | " nhop via %s (%d labels)", |
626 | nexthop2str(nexthop, buf, sizeof(buf)), | |
627 | num_labels); | |
d62a17ae | 628 | } |
629 | ||
630 | if (nhlist_tail) { | |
631 | nhlist_tail->next = nexthop; | |
632 | nhlist_tail = nexthop; | |
633 | } else { | |
634 | nhlist_tail = nexthop; | |
635 | nhlist_head = nexthop; | |
636 | } | |
637 | ||
638 | /* No need to evaluate the nexthop if we have already | |
639 | * determined | |
640 | * that there has been a change. | |
641 | */ | |
642 | if (bnc->change_flags & BGP_NEXTHOP_CHANGED) | |
643 | continue; | |
644 | ||
645 | for (oldnh = bnc->nexthop; oldnh; oldnh = oldnh->next) | |
78fba41b | 646 | if (nexthop_same(oldnh, nexthop)) |
d62a17ae | 647 | break; |
648 | ||
649 | if (!oldnh) | |
650 | bnc->change_flags |= BGP_NEXTHOP_CHANGED; | |
651 | } | |
652 | bnc_nexthop_free(bnc); | |
653 | bnc->nexthop = nhlist_head; | |
021b6596 AD |
654 | |
655 | /* | |
656 | * Gateway IP nexthop is L3 reachable. Mark it as | |
657 | * BGP_NEXTHOP_VALID only if it is recursively resolved with a | |
658 | * remote EVPN RT-2. | |
659 | * Else, mark it as BGP_NEXTHOP_EVPN_INCOMPLETE. | |
660 | * When its mapping with EVPN RT-2 is established, unset | |
661 | * BGP_NEXTHOP_EVPN_INCOMPLETE and set BGP_NEXTHOP_VALID. | |
662 | */ | |
663 | if (bnc->is_evpn_gwip_nexthop) { | |
664 | evpn_resolved = bgp_evpn_is_gateway_ip_resolved(bnc); | |
665 | ||
511211bf | 666 | if (BGP_DEBUG(nht, NHT)) |
021b6596 | 667 | zlog_debug( |
511211bf DA |
668 | "EVPN gateway IP %pFX recursive MAC/IP lookup %s", |
669 | &bnc->prefix, | |
021b6596 AD |
670 | (evpn_resolved ? "successful" |
671 | : "failed")); | |
021b6596 AD |
672 | |
673 | if (evpn_resolved) { | |
674 | bnc->flags |= BGP_NEXTHOP_VALID; | |
675 | bnc->flags &= ~BGP_NEXTHOP_EVPN_INCOMPLETE; | |
676 | bnc->change_flags |= BGP_NEXTHOP_MACIP_CHANGED; | |
677 | } else { | |
678 | bnc->flags |= BGP_NEXTHOP_EVPN_INCOMPLETE; | |
679 | bnc->flags &= ~BGP_NEXTHOP_VALID; | |
680 | } | |
681 | } | |
d62a17ae | 682 | } else { |
021b6596 | 683 | bnc->flags &= ~BGP_NEXTHOP_EVPN_INCOMPLETE; |
d62a17ae | 684 | bnc->flags &= ~BGP_NEXTHOP_VALID; |
c3b95419 | 685 | bnc->flags &= ~BGP_NEXTHOP_LABELED_VALID; |
545aeef1 | 686 | bnc->nexthop_num = nhr->nexthop_num; |
d62a17ae | 687 | |
688 | /* notify bgp fsm if nbr ip goes from valid->invalid */ | |
689 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
690 | ||
691 | bnc_nexthop_free(bnc); | |
692 | bnc->nexthop = NULL; | |
693 | } | |
694 | ||
695 | evaluate_paths(bnc); | |
fb018d25 DS |
696 | } |
697 | ||
8761cd6d DS |
698 | static void bgp_nht_ifp_table_handle(struct bgp *bgp, |
699 | struct bgp_nexthop_cache_head *table, | |
700 | struct interface *ifp, bool up) | |
701 | { | |
702 | struct bgp_nexthop_cache *bnc; | |
703 | ||
704 | frr_each (bgp_nexthop_cache, table, bnc) { | |
705 | if (bnc->ifindex != ifp->ifindex) | |
706 | continue; | |
707 | ||
083ec940 | 708 | bnc->last_update = monotime(NULL); |
8761cd6d DS |
709 | bnc->change_flags = 0; |
710 | ||
474cfe4a DS |
711 | /* |
712 | * For interface based routes ( ala the v6 LL routes | |
713 | * that this was written for ) the metric received | |
714 | * for the connected route is 0 not 1. | |
715 | */ | |
716 | bnc->metric = 0; | |
8761cd6d DS |
717 | if (up) { |
718 | SET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
719 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
8761cd6d DS |
720 | bnc->nexthop_num = 1; |
721 | } else { | |
722 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
723 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
724 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
725 | bnc->nexthop_num = 0; | |
8761cd6d DS |
726 | } |
727 | ||
728 | evaluate_paths(bnc); | |
729 | } | |
730 | } | |
731 | static void bgp_nht_ifp_handle(struct interface *ifp, bool up) | |
732 | { | |
733 | struct bgp *bgp; | |
734 | ||
096f7609 | 735 | bgp = ifp->vrf->info; |
8761cd6d DS |
736 | if (!bgp) |
737 | return; | |
738 | ||
7f2e9cce DS |
739 | bgp_nht_ifp_table_handle(bgp, &bgp->nexthop_cache_table[AFI_IP], ifp, |
740 | up); | |
741 | bgp_nht_ifp_table_handle(bgp, &bgp->import_check_table[AFI_IP], ifp, | |
742 | up); | |
8761cd6d DS |
743 | bgp_nht_ifp_table_handle(bgp, &bgp->nexthop_cache_table[AFI_IP6], ifp, |
744 | up); | |
745 | bgp_nht_ifp_table_handle(bgp, &bgp->import_check_table[AFI_IP6], ifp, | |
746 | up); | |
747 | } | |
748 | ||
749 | void bgp_nht_ifp_up(struct interface *ifp) | |
750 | { | |
751 | bgp_nht_ifp_handle(ifp, true); | |
752 | } | |
753 | ||
754 | void bgp_nht_ifp_down(struct interface *ifp) | |
755 | { | |
756 | bgp_nht_ifp_handle(ifp, false); | |
757 | } | |
758 | ||
e6685141 | 759 | static void bgp_nht_ifp_initial(struct event *thread) |
8761cd6d | 760 | { |
e16d030c DS |
761 | ifindex_t ifindex = EVENT_VAL(thread); |
762 | struct bgp *bgp = EVENT_ARG(thread); | |
0b52b75a | 763 | struct interface *ifp = if_lookup_by_index(ifindex, bgp->vrf_id); |
8761cd6d DS |
764 | |
765 | if (!ifp) | |
cc9f21da | 766 | return; |
8761cd6d | 767 | |
4115b296 | 768 | if (BGP_DEBUG(nht, NHT)) |
769 | zlog_debug( | |
770 | "Handle NHT initial update for Intf %s(%d) status %s", | |
771 | ifp->name, ifp->ifindex, if_is_up(ifp) ? "up" : "down"); | |
772 | ||
8761cd6d DS |
773 | if (if_is_up(ifp)) |
774 | bgp_nht_ifp_up(ifp); | |
775 | else | |
776 | bgp_nht_ifp_down(ifp); | |
8761cd6d DS |
777 | } |
778 | ||
779 | /* | |
780 | * So the bnc code has the ability to handle interface up/down | |
781 | * events to properly handle v6 LL peering. | |
782 | * What is happening here: | |
783 | * The event system for peering expects the nht code to | |
784 | * report on the tracking events after we move to active | |
785 | * So let's give the system a chance to report on that event | |
786 | * in a manner that is expected. | |
787 | */ | |
788 | void bgp_nht_interface_events(struct peer *peer) | |
789 | { | |
790 | struct bgp *bgp = peer->bgp; | |
791 | struct bgp_nexthop_cache_head *table; | |
792 | struct bgp_nexthop_cache *bnc; | |
793 | struct prefix p; | |
35aae5c9 | 794 | ifindex_t ifindex = 0; |
8761cd6d DS |
795 | |
796 | if (!IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
797 | return; | |
798 | ||
799 | if (!sockunion2hostprefix(&peer->su, &p)) | |
800 | return; | |
35aae5c9 DS |
801 | /* |
802 | * Gather the ifindex for if up/down events to be | |
803 | * tagged into this fun | |
804 | */ | |
805 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
806 | ifindex = peer->su.sin6.sin6_scope_id; | |
8761cd6d DS |
807 | |
808 | table = &bgp->nexthop_cache_table[AFI_IP6]; | |
35aae5c9 | 809 | bnc = bnc_find(table, &p, 0, ifindex); |
8761cd6d DS |
810 | if (!bnc) |
811 | return; | |
812 | ||
813 | if (bnc->ifindex) | |
907a2395 DS |
814 | event_add_event(bm->master, bgp_nht_ifp_initial, bnc->bgp, |
815 | bnc->ifindex, NULL); | |
8761cd6d DS |
816 | } |
817 | ||
545aeef1 RW |
818 | void bgp_parse_nexthop_update(int command, vrf_id_t vrf_id) |
819 | { | |
820 | struct bgp_nexthop_cache_head *tree = NULL; | |
b8210849 | 821 | struct bgp_nexthop_cache *bnc_nhc, *bnc_import; |
545aeef1 | 822 | struct bgp *bgp; |
06e4e901 | 823 | struct prefix match; |
545aeef1 RW |
824 | struct zapi_route nhr; |
825 | afi_t afi; | |
826 | ||
827 | bgp = bgp_lookup_by_vrf_id(vrf_id); | |
828 | if (!bgp) { | |
829 | flog_err( | |
830 | EC_BGP_NH_UPD, | |
831 | "parse nexthop update: instance not found for vrf_id %u", | |
832 | vrf_id); | |
833 | return; | |
834 | } | |
835 | ||
06e4e901 | 836 | if (!zapi_nexthop_update_decode(zclient->ibuf, &match, &nhr)) { |
cc42c4f0 DS |
837 | zlog_err("%s[%s]: Failure to decode nexthop update", __func__, |
838 | bgp->name_pretty); | |
545aeef1 RW |
839 | return; |
840 | } | |
841 | ||
06e4e901 | 842 | afi = family2afi(match.family); |
b8210849 | 843 | tree = &bgp->nexthop_cache_table[afi]; |
545aeef1 | 844 | |
35aae5c9 | 845 | bnc_nhc = bnc_find(tree, &match, nhr.srte_color, 0); |
2bb8b49c DS |
846 | if (!bnc_nhc) { |
847 | if (BGP_DEBUG(nht, NHT)) | |
848 | zlog_debug( | |
849 | "parse nexthop update(%pFX(%u)(%s)): bnc info not found for nexthop cache", | |
850 | &nhr.prefix, nhr.srte_color, bgp->name_pretty); | |
851 | } else | |
9f002fa5 | 852 | bgp_process_nexthop_update(bnc_nhc, &nhr, false); |
b8210849 DS |
853 | |
854 | tree = &bgp->import_check_table[afi]; | |
855 | ||
35aae5c9 | 856 | bnc_import = bnc_find(tree, &match, nhr.srte_color, 0); |
2bb8b49c DS |
857 | if (!bnc_import) { |
858 | if (BGP_DEBUG(nht, NHT)) | |
859 | zlog_debug( | |
860 | "parse nexthop update(%pFX(%u)(%s)): bnc info not found for import check", | |
861 | &nhr.prefix, nhr.srte_color, bgp->name_pretty); | |
862 | } else | |
d00a5f6b | 863 | bgp_process_nexthop_update(bnc_import, &nhr, true); |
1e24860b | 864 | |
545aeef1 RW |
865 | /* |
866 | * HACK: if any BGP route is dependant on an SR-policy that doesn't | |
867 | * exist, zebra will never send NH updates relative to that policy. In | |
868 | * that case, whenever we receive an update about a colorless NH, update | |
869 | * the corresponding colorful NHs that share the same endpoint but that | |
870 | * are inactive. This ugly hack should work around the problem at the | |
871 | * cost of a performance pernalty. Long term, what should be done is to | |
872 | * make zebra's RNH subsystem aware of SR-TE colors (like bgpd is), | |
873 | * which should provide a better infrastructure to solve this issue in | |
874 | * a more efficient and elegant way. | |
875 | */ | |
b8210849 | 876 | if (nhr.srte_color == 0 && bnc_nhc) { |
545aeef1 RW |
877 | struct bgp_nexthop_cache *bnc_iter; |
878 | ||
879 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], | |
880 | bnc_iter) { | |
d00a5f6b DS |
881 | if (!prefix_same(&bnc_nhc->prefix, &bnc_iter->prefix) || |
882 | bnc_iter->srte_color == 0 || | |
883 | CHECK_FLAG(bnc_iter->flags, BGP_NEXTHOP_VALID)) | |
545aeef1 RW |
884 | continue; |
885 | ||
9f002fa5 | 886 | bgp_process_nexthop_update(bnc_iter, &nhr, false); |
545aeef1 RW |
887 | } |
888 | } | |
889 | } | |
890 | ||
ee7ca6c0 | 891 | /* |
892 | * Cleanup nexthop registration and status information for BGP nexthops | |
893 | * pertaining to this VRF. This is invoked upon VRF deletion. | |
894 | */ | |
895 | void bgp_cleanup_nexthops(struct bgp *bgp) | |
896 | { | |
f663c581 RW |
897 | for (afi_t afi = AFI_IP; afi < AFI_MAX; afi++) { |
898 | struct bgp_nexthop_cache *bnc; | |
ee7ca6c0 | 899 | |
f663c581 RW |
900 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], |
901 | bnc) { | |
ee7ca6c0 | 902 | /* Clear relevant flags. */ |
903 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
904 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
905 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
021b6596 | 906 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_EVPN_INCOMPLETE); |
ee7ca6c0 | 907 | } |
908 | } | |
909 | } | |
910 | ||
fb018d25 DS |
911 | /** |
912 | * make_prefix - make a prefix structure from the path (essentially | |
913 | * path's node. | |
914 | */ | |
40381db7 | 915 | static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p) |
fb018d25 | 916 | { |
078430f6 | 917 | |
40381db7 DS |
918 | int is_bgp_static = ((pi->type == ZEBRA_ROUTE_BGP) |
919 | && (pi->sub_type == BGP_ROUTE_STATIC)) | |
d62a17ae | 920 | ? 1 |
921 | : 0; | |
9bcb3eef DS |
922 | struct bgp_dest *net = pi->net; |
923 | const struct prefix *p_orig = bgp_dest_get_prefix(net); | |
92d6f769 | 924 | struct in_addr ipv4; |
0378bcaa PG |
925 | |
926 | if (p_orig->family == AF_FLOWSPEC) { | |
927 | if (!pi->peer) | |
928 | return -1; | |
929 | return bgp_flowspec_get_first_nh(pi->peer->bgp, | |
1840384b | 930 | pi, p, afi); |
0378bcaa | 931 | } |
d62a17ae | 932 | memset(p, 0, sizeof(struct prefix)); |
933 | switch (afi) { | |
934 | case AFI_IP: | |
935 | p->family = AF_INET; | |
936 | if (is_bgp_static) { | |
b54892e0 DS |
937 | p->u.prefix4 = p_orig->u.prefix4; |
938 | p->prefixlen = p_orig->prefixlen; | |
d62a17ae | 939 | } else { |
92d6f769 K |
940 | if (IS_MAPPED_IPV6(&pi->attr->mp_nexthop_global)) { |
941 | ipv4_mapped_ipv6_to_ipv4( | |
942 | &pi->attr->mp_nexthop_global, &ipv4); | |
943 | p->u.prefix4 = ipv4; | |
944 | p->prefixlen = IPV4_MAX_BITLEN; | |
945 | } else { | |
7226bc40 TA |
946 | if (p_orig->family == AF_EVPN) |
947 | p->u.prefix4 = | |
948 | pi->attr->mp_nexthop_global_in; | |
949 | else | |
950 | p->u.prefix4 = pi->attr->nexthop; | |
92d6f769 K |
951 | p->prefixlen = IPV4_MAX_BITLEN; |
952 | } | |
d62a17ae | 953 | } |
954 | break; | |
955 | case AFI_IP6: | |
d62a17ae | 956 | p->family = AF_INET6; |
957 | ||
958 | if (is_bgp_static) { | |
b54892e0 DS |
959 | p->u.prefix6 = p_orig->u.prefix6; |
960 | p->prefixlen = p_orig->prefixlen; | |
d62a17ae | 961 | } else { |
606fdbb1 DA |
962 | /* If we receive MP_REACH nexthop with ::(LL) |
963 | * or LL(LL), use LL address as nexthop cache. | |
964 | */ | |
965 | if (pi->attr->mp_nexthop_len | |
966 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL | |
967 | && (IN6_IS_ADDR_UNSPECIFIED( | |
968 | &pi->attr->mp_nexthop_global) | |
969 | || IN6_IS_ADDR_LINKLOCAL( | |
970 | &pi->attr->mp_nexthop_global))) | |
971 | p->u.prefix6 = pi->attr->mp_nexthop_local; | |
17ef5a93 PG |
972 | /* If we receive MR_REACH with (GA)::(LL) |
973 | * then check for route-map to choose GA or LL | |
974 | */ | |
975 | else if (pi->attr->mp_nexthop_len | |
976 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
2bb8b49c | 977 | if (pi->attr->mp_nexthop_prefer_global) |
17ef5a93 PG |
978 | p->u.prefix6 = |
979 | pi->attr->mp_nexthop_global; | |
980 | else | |
981 | p->u.prefix6 = | |
982 | pi->attr->mp_nexthop_local; | |
983 | } else | |
606fdbb1 | 984 | p->u.prefix6 = pi->attr->mp_nexthop_global; |
d62a17ae | 985 | p->prefixlen = IPV6_MAX_BITLEN; |
986 | } | |
987 | break; | |
988 | default: | |
989 | if (BGP_DEBUG(nht, NHT)) { | |
990 | zlog_debug( | |
991 | "%s: Attempting to make prefix with unknown AFI %d (not %d or %d)", | |
15569c58 | 992 | __func__, afi, AFI_IP, AFI_IP6); |
d62a17ae | 993 | } |
994 | break; | |
65740e1b | 995 | } |
d62a17ae | 996 | return 0; |
fb018d25 DS |
997 | } |
998 | ||
999 | /** | |
078430f6 | 1000 | * sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister |
fb018d25 DS |
1001 | * command to Zebra. |
1002 | * ARGUMENTS: | |
1003 | * struct bgp_nexthop_cache *bnc -- the nexthop structure. | |
078430f6 | 1004 | * int command -- command to send to zebra |
fb018d25 DS |
1005 | * RETURNS: |
1006 | * void. | |
1007 | */ | |
d62a17ae | 1008 | static void sendmsg_zebra_rnh(struct bgp_nexthop_cache *bnc, int command) |
fb018d25 | 1009 | { |
3c192540 | 1010 | bool exact_match = false; |
ed6cec97 | 1011 | bool resolve_via_default = false; |
d62a17ae | 1012 | int ret; |
1013 | ||
3c192540 | 1014 | if (!zclient) |
d62a17ae | 1015 | return; |
1016 | ||
1017 | /* Don't try to register if Zebra doesn't know of this instance. */ | |
bb4ef1ae DS |
1018 | if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bnc->bgp)) { |
1019 | if (BGP_DEBUG(zebra, ZEBRA)) | |
15569c58 DA |
1020 | zlog_debug( |
1021 | "%s: No zebra instance to talk to, not installing NHT entry", | |
1022 | __func__); | |
d62a17ae | 1023 | return; |
bb4ef1ae | 1024 | } |
d62a17ae | 1025 | |
1ee0a2df DS |
1026 | if (!bgp_zebra_num_connects()) { |
1027 | if (BGP_DEBUG(zebra, ZEBRA)) | |
15569c58 DA |
1028 | zlog_debug( |
1029 | "%s: We have not connected yet, cannot send nexthops", | |
1030 | __func__); | |
1ee0a2df | 1031 | } |
ed6cec97 DS |
1032 | if (command == ZEBRA_NEXTHOP_REGISTER) { |
1033 | if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) | |
1034 | exact_match = true; | |
1035 | if (CHECK_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH)) | |
1036 | resolve_via_default = true; | |
1037 | } | |
d62a17ae | 1038 | |
f663c581 RW |
1039 | if (BGP_DEBUG(zebra, ZEBRA)) |
1040 | zlog_debug("%s: sending cmd %s for %pFX (vrf %s)", __func__, | |
1041 | zserv_command_string(command), &bnc->prefix, | |
1042 | bnc->bgp->name_pretty); | |
960035b2 | 1043 | |
eb3c9d97 DL |
1044 | ret = zclient_send_rnh(zclient, command, &bnc->prefix, SAFI_UNICAST, |
1045 | exact_match, resolve_via_default, | |
1046 | bnc->bgp->vrf_id); | |
a6522038 | 1047 | if (ret == ZCLIENT_SEND_FAILURE) { |
e50f7cfd | 1048 | flog_warn(EC_BGP_ZEBRA_SEND, |
f162a5b9 | 1049 | "sendmsg_nexthop: zclient_send_message() failed"); |
a6522038 | 1050 | return; |
1051 | } | |
d62a17ae | 1052 | |
3d174ce0 | 1053 | if (command == ZEBRA_NEXTHOP_REGISTER) |
d62a17ae | 1054 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
3d174ce0 | 1055 | else if (command == ZEBRA_NEXTHOP_UNREGISTER) |
d62a17ae | 1056 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
1057 | return; | |
fb018d25 DS |
1058 | } |
1059 | ||
1060 | /** | |
078430f6 DS |
1061 | * register_zebra_rnh - register a NH/route with Zebra for notification |
1062 | * when the route or the route to the nexthop changes. | |
fb018d25 | 1063 | * ARGUMENTS: |
078430f6 | 1064 | * struct bgp_nexthop_cache *bnc |
fb018d25 DS |
1065 | * RETURNS: |
1066 | * void. | |
1067 | */ | |
23f60ffd | 1068 | static void register_zebra_rnh(struct bgp_nexthop_cache *bnc) |
fb018d25 | 1069 | { |
d62a17ae | 1070 | /* Check if we have already registered */ |
1071 | if (bnc->flags & BGP_NEXTHOP_REGISTERED) | |
1072 | return; | |
8761cd6d DS |
1073 | |
1074 | if (bnc->ifindex) { | |
1075 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
1076 | return; | |
1077 | } | |
1078 | ||
3d174ce0 | 1079 | sendmsg_zebra_rnh(bnc, ZEBRA_NEXTHOP_REGISTER); |
fb018d25 DS |
1080 | } |
1081 | ||
1082 | /** | |
078430f6 | 1083 | * unregister_zebra_rnh -- Unregister the route/nexthop from Zebra. |
fb018d25 | 1084 | * ARGUMENTS: |
078430f6 | 1085 | * struct bgp_nexthop_cache *bnc |
fb018d25 DS |
1086 | * RETURNS: |
1087 | * void. | |
1088 | */ | |
23f60ffd | 1089 | static void unregister_zebra_rnh(struct bgp_nexthop_cache *bnc) |
fb018d25 | 1090 | { |
d62a17ae | 1091 | /* Check if we have already registered */ |
1092 | if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED)) | |
1093 | return; | |
1094 | ||
8761cd6d DS |
1095 | if (bnc->ifindex) { |
1096 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
1097 | return; | |
1098 | } | |
1099 | ||
3d174ce0 | 1100 | sendmsg_zebra_rnh(bnc, ZEBRA_NEXTHOP_UNREGISTER); |
fb018d25 DS |
1101 | } |
1102 | ||
1103 | /** | |
1104 | * evaluate_paths - Evaluate the paths/nets associated with a nexthop. | |
1105 | * ARGUMENTS: | |
1106 | * struct bgp_nexthop_cache *bnc -- the nexthop structure. | |
1107 | * RETURNS: | |
1108 | * void. | |
1109 | */ | |
021b6596 | 1110 | void evaluate_paths(struct bgp_nexthop_cache *bnc) |
fb018d25 | 1111 | { |
9bcb3eef | 1112 | struct bgp_dest *dest; |
4b7e6066 | 1113 | struct bgp_path_info *path; |
ac2f64d3 | 1114 | struct bgp_path_info *bpi_ultimate; |
d62a17ae | 1115 | int afi; |
1116 | struct peer *peer = (struct peer *)bnc->nht_info; | |
1117 | struct bgp_table *table; | |
1118 | safi_t safi; | |
960035b2 | 1119 | struct bgp *bgp_path; |
b54892e0 | 1120 | const struct prefix *p; |
d62a17ae | 1121 | |
1122 | if (BGP_DEBUG(nht, NHT)) { | |
987a720a | 1123 | char bnc_buf[BNC_FLAG_DUMP_SIZE]; |
df2a41a9 | 1124 | char chg_buf[BNC_FLAG_DUMP_SIZE]; |
987a720a | 1125 | |
d62a17ae | 1126 | zlog_debug( |
036f482f DA |
1127 | "NH update for %pFX(%d)(%u)(%s) - flags %s chgflags %s- evaluate paths", |
1128 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 1129 | bnc->bgp->name_pretty, |
df2a41a9 DS |
1130 | bgp_nexthop_dump_bnc_flags(bnc, bnc_buf, |
1131 | sizeof(bnc_buf)), | |
1132 | bgp_nexthop_dump_bnc_change_flags(bnc, chg_buf, | |
1133 | sizeof(bnc_buf))); | |
fb018d25 DS |
1134 | } |
1135 | ||
a2addae8 | 1136 | LIST_FOREACH (path, &(bnc->paths), nh_thread) { |
d62a17ae | 1137 | if (!(path->type == ZEBRA_ROUTE_BGP |
1138 | && ((path->sub_type == BGP_ROUTE_NORMAL) | |
960035b2 PZ |
1139 | || (path->sub_type == BGP_ROUTE_STATIC) |
1140 | || (path->sub_type == BGP_ROUTE_IMPORTED)))) | |
d62a17ae | 1141 | continue; |
1142 | ||
9bcb3eef DS |
1143 | dest = path->net; |
1144 | assert(dest && bgp_dest_table(dest)); | |
1145 | p = bgp_dest_get_prefix(dest); | |
b54892e0 | 1146 | afi = family2afi(p->family); |
9bcb3eef | 1147 | table = bgp_dest_table(dest); |
d62a17ae | 1148 | safi = table->safi; |
1149 | ||
960035b2 PZ |
1150 | /* |
1151 | * handle routes from other VRFs (they can have a | |
1152 | * nexthop in THIS VRF). bgp_path is the bgp instance | |
1153 | * that owns the route referencing this nexthop. | |
1154 | */ | |
1155 | bgp_path = table->bgp; | |
1156 | ||
1157 | /* | |
1158 | * Path becomes valid/invalid depending on whether the nexthop | |
d62a17ae | 1159 | * reachable/unreachable. |
960035b2 PZ |
1160 | * |
1161 | * In case of unicast routes that were imported from vpn | |
1162 | * and that have labels, they are valid only if there are | |
1163 | * nexthops with labels | |
a2299aba AD |
1164 | * |
1165 | * If the nexthop is EVPN gateway-IP, | |
1166 | * do not check for a valid label. | |
d62a17ae | 1167 | */ |
960035b2 | 1168 | |
34ea39b6 | 1169 | bool bnc_is_valid_nexthop = false; |
1170 | bool path_valid = false; | |
960035b2 | 1171 | |
021b6596 AD |
1172 | if (safi == SAFI_UNICAST && path->sub_type == BGP_ROUTE_IMPORTED |
1173 | && path->extra && path->extra->num_labels | |
1174 | && (path->attr->evpn_overlay.type | |
1175 | != OVERLAY_INDEX_GATEWAY_IP)) { | |
960035b2 | 1176 | bnc_is_valid_nexthop = |
1bb550b6 PG |
1177 | bgp_isvalid_nexthop_for_mpls(bnc, path) ? true |
1178 | : false; | |
960035b2 | 1179 | } else { |
e7cbe5e5 NT |
1180 | if (bgp_update_martian_nexthop( |
1181 | bnc->bgp, afi, safi, path->type, | |
9bcb3eef | 1182 | path->sub_type, path->attr, dest)) { |
e7cbe5e5 NT |
1183 | if (BGP_DEBUG(nht, NHT)) |
1184 | zlog_debug( | |
56ca3b5b | 1185 | "%s: prefix %pBD (vrf %s), ignoring path due to martian or self-next-hop", |
9bcb3eef | 1186 | __func__, dest, bgp_path->name); |
e7cbe5e5 NT |
1187 | } else |
1188 | bnc_is_valid_nexthop = | |
34ea39b6 | 1189 | bgp_isvalid_nexthop(bnc) ? true : false; |
960035b2 PZ |
1190 | } |
1191 | ||
9e15d76a | 1192 | if (BGP_DEBUG(nht, NHT)) { |
4a8cd6ad PG |
1193 | |
1194 | if (dest->pdest) { | |
1195 | char rd_buf[RD_ADDRSTRLEN]; | |
1196 | ||
1197 | prefix_rd2str( | |
c4f64ea9 DA |
1198 | (struct prefix_rd *)bgp_dest_get_prefix( |
1199 | dest->pdest), | |
4a8cd6ad PG |
1200 | rd_buf, sizeof(rd_buf), |
1201 | bgp_get_asnotation(bnc->bgp)); | |
1202 | zlog_debug( | |
1203 | "... eval path %d/%d %pBD RD %s %s flags 0x%x", | |
1204 | afi, safi, dest, rd_buf, | |
9e15d76a | 1205 | bgp_path->name_pretty, path->flags); |
4a8cd6ad | 1206 | } else |
9e15d76a | 1207 | zlog_debug( |
56ca3b5b | 1208 | "... eval path %d/%d %pBD %s flags 0x%x", |
9bcb3eef | 1209 | afi, safi, dest, bgp_path->name_pretty, |
9e15d76a | 1210 | path->flags); |
1211 | } | |
d62a17ae | 1212 | |
0139efe0 | 1213 | /* Skip paths marked for removal or as history. */ |
1214 | if (CHECK_FLAG(path->flags, BGP_PATH_REMOVED) | |
1215 | || CHECK_FLAG(path->flags, BGP_PATH_HISTORY)) | |
1216 | continue; | |
1217 | ||
d62a17ae | 1218 | /* Copy the metric to the path. Will be used for bestpath |
1219 | * computation */ | |
ac2f64d3 | 1220 | bpi_ultimate = bgp_get_imported_bpi_ultimate(path); |
d62a17ae | 1221 | if (bgp_isvalid_nexthop(bnc) && bnc->metric) |
ac2f64d3 | 1222 | (bgp_path_info_extra_get(bpi_ultimate))->igpmetric = |
18ee8310 | 1223 | bnc->metric; |
ac2f64d3 LS |
1224 | else if (bpi_ultimate->extra) |
1225 | bpi_ultimate->extra->igpmetric = 0; | |
d62a17ae | 1226 | |
1227 | if (CHECK_FLAG(bnc->change_flags, BGP_NEXTHOP_METRIC_CHANGED) | |
545aeef1 RW |
1228 | || CHECK_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED) |
1229 | || path->attr->srte_color != 0) | |
1defdda8 | 1230 | SET_FLAG(path->flags, BGP_PATH_IGP_CHANGED); |
d62a17ae | 1231 | |
d4980edf | 1232 | path_valid = CHECK_FLAG(path->flags, BGP_PATH_VALID); |
34ea39b6 | 1233 | if (path_valid != bnc_is_valid_nexthop) { |
1234 | if (path_valid) { | |
1235 | /* No longer valid, clear flag; also for EVPN | |
1236 | * routes, unimport from VRFs if needed. | |
1237 | */ | |
1238 | bgp_aggregate_decrement(bgp_path, p, path, afi, | |
1239 | safi); | |
9bcb3eef | 1240 | bgp_path_info_unset_flag(dest, path, |
34ea39b6 | 1241 | BGP_PATH_VALID); |
1242 | if (safi == SAFI_EVPN && | |
9bcb3eef | 1243 | bgp_evpn_is_prefix_nht_supported(bgp_dest_get_prefix(dest))) |
34ea39b6 | 1244 | bgp_evpn_unimport_route(bgp_path, |
9bcb3eef | 1245 | afi, safi, bgp_dest_get_prefix(dest), path); |
34ea39b6 | 1246 | } else { |
1247 | /* Path becomes valid, set flag; also for EVPN | |
1248 | * routes, import from VRFs if needed. | |
1249 | */ | |
9bcb3eef | 1250 | bgp_path_info_set_flag(dest, path, |
34ea39b6 | 1251 | BGP_PATH_VALID); |
1252 | bgp_aggregate_increment(bgp_path, p, path, afi, | |
1253 | safi); | |
1254 | if (safi == SAFI_EVPN && | |
9bcb3eef | 1255 | bgp_evpn_is_prefix_nht_supported(bgp_dest_get_prefix(dest))) |
34ea39b6 | 1256 | bgp_evpn_import_route(bgp_path, |
9bcb3eef | 1257 | afi, safi, bgp_dest_get_prefix(dest), path); |
34ea39b6 | 1258 | } |
7c312383 AD |
1259 | } |
1260 | ||
9bcb3eef | 1261 | bgp_process(bgp_path, dest, afi, safi); |
d62a17ae | 1262 | } |
fc9a856f | 1263 | |
1e91f1d1 DS |
1264 | if (peer) { |
1265 | int valid_nexthops = bgp_isvalid_nexthop(bnc); | |
1266 | ||
824065c4 DS |
1267 | if (valid_nexthops) { |
1268 | /* | |
1269 | * Peering cannot occur across a blackhole nexthop | |
1270 | */ | |
e817f2cc | 1271 | if (bnc->nexthop_num == 1 && bnc->nexthop |
824065c4 DS |
1272 | && bnc->nexthop->type == NEXTHOP_TYPE_BLACKHOLE) { |
1273 | peer->last_reset = PEER_DOWN_WAITING_NHT; | |
1274 | valid_nexthops = 0; | |
1275 | } else | |
1276 | peer->last_reset = PEER_DOWN_WAITING_OPEN; | |
1277 | } else | |
1e91f1d1 DS |
1278 | peer->last_reset = PEER_DOWN_WAITING_NHT; |
1279 | ||
1280 | if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED)) { | |
1281 | if (BGP_DEBUG(nht, NHT)) | |
15569c58 | 1282 | zlog_debug( |
8761cd6d | 1283 | "%s: Updating peer (%s(%s)) status with NHT nexthops %d", |
15569c58 | 1284 | __func__, peer->host, |
8761cd6d DS |
1285 | peer->bgp->name_pretty, |
1286 | !!valid_nexthops); | |
f8dcd38d | 1287 | bgp_fsm_nht_update(peer, !!valid_nexthops); |
1e91f1d1 DS |
1288 | SET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); |
1289 | } | |
d62a17ae | 1290 | } |
fc9a856f | 1291 | |
d62a17ae | 1292 | RESET_FLAG(bnc->change_flags); |
fb018d25 DS |
1293 | } |
1294 | ||
1295 | /** | |
1296 | * path_nh_map - make or break path-to-nexthop association. | |
1297 | * ARGUMENTS: | |
1298 | * path - pointer to the path structure | |
1299 | * bnc - pointer to the nexthop structure | |
1300 | * make - if set, make the association. if unset, just break the existing | |
1301 | * association. | |
1302 | */ | |
7f040da1 DS |
1303 | void path_nh_map(struct bgp_path_info *path, struct bgp_nexthop_cache *bnc, |
1304 | bool make) | |
fb018d25 | 1305 | { |
d62a17ae | 1306 | if (path->nexthop) { |
1307 | LIST_REMOVE(path, nh_thread); | |
1308 | path->nexthop->path_count--; | |
1309 | path->nexthop = NULL; | |
1310 | } | |
1311 | if (make) { | |
1312 | LIST_INSERT_HEAD(&(bnc->paths), path, nh_thread); | |
1313 | path->nexthop = bnc; | |
1314 | path->nexthop->path_count++; | |
1315 | } | |
fb018d25 | 1316 | } |
1ee0a2df DS |
1317 | |
1318 | /* | |
1319 | * This function is called to register nexthops to zebra | |
1320 | * as that we may have tried to install the nexthops | |
1321 | * before we actually have a zebra connection | |
1322 | */ | |
1323 | void bgp_nht_register_nexthops(struct bgp *bgp) | |
1324 | { | |
f663c581 RW |
1325 | for (afi_t afi = AFI_IP; afi < AFI_MAX; afi++) { |
1326 | struct bgp_nexthop_cache *bnc; | |
1ee0a2df | 1327 | |
f663c581 RW |
1328 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], |
1329 | bnc) { | |
23f60ffd | 1330 | register_zebra_rnh(bnc); |
1ee0a2df DS |
1331 | } |
1332 | } | |
1333 | } | |
1ea03b90 | 1334 | |
b3a3290e | 1335 | void bgp_nht_reg_enhe_cap_intfs(struct peer *peer) |
1ea03b90 DS |
1336 | { |
1337 | struct bgp *bgp; | |
1ea03b90 DS |
1338 | struct bgp_nexthop_cache *bnc; |
1339 | struct nexthop *nhop; | |
1340 | struct interface *ifp; | |
1341 | struct prefix p; | |
35aae5c9 | 1342 | ifindex_t ifindex = 0; |
1ea03b90 DS |
1343 | |
1344 | if (peer->ifp) | |
1345 | return; | |
1346 | ||
1347 | bgp = peer->bgp; | |
1ea03b90 | 1348 | if (!sockunion2hostprefix(&peer->su, &p)) { |
b3a3290e DS |
1349 | zlog_warn("%s: Unable to convert sockunion to prefix for %s", |
1350 | __func__, peer->host); | |
1ea03b90 DS |
1351 | return; |
1352 | } | |
1353 | ||
1354 | if (p.family != AF_INET6) | |
1355 | return; | |
35aae5c9 DS |
1356 | /* |
1357 | * Gather the ifindex for if up/down events to be | |
1358 | * tagged into this fun | |
1359 | */ | |
1360 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
1361 | ifindex = peer->su.sin6.sin6_scope_id; | |
1ea03b90 | 1362 | |
35aae5c9 | 1363 | bnc = bnc_find(&bgp->nexthop_cache_table[AFI_IP6], &p, 0, ifindex); |
1ea03b90 DS |
1364 | if (!bnc) |
1365 | return; | |
1366 | ||
1367 | if (peer != bnc->nht_info) | |
1368 | return; | |
1369 | ||
1370 | for (nhop = bnc->nexthop; nhop; nhop = nhop->next) { | |
8c9769e0 DS |
1371 | ifp = if_lookup_by_index(nhop->ifindex, nhop->vrf_id); |
1372 | ||
1373 | if (!ifp) | |
1374 | continue; | |
1375 | ||
1ea03b90 DS |
1376 | zclient_send_interface_radv_req(zclient, |
1377 | nhop->vrf_id, | |
1378 | ifp, true, | |
1379 | BGP_UNNUM_DEFAULT_RA_INTERVAL); | |
1380 | } | |
1381 | } | |
b3a3290e DS |
1382 | |
1383 | void bgp_nht_dereg_enhe_cap_intfs(struct peer *peer) | |
1384 | { | |
1385 | struct bgp *bgp; | |
b3a3290e DS |
1386 | struct bgp_nexthop_cache *bnc; |
1387 | struct nexthop *nhop; | |
1388 | struct interface *ifp; | |
1389 | struct prefix p; | |
35aae5c9 | 1390 | ifindex_t ifindex = 0; |
b3a3290e DS |
1391 | |
1392 | if (peer->ifp) | |
1393 | return; | |
1394 | ||
1395 | bgp = peer->bgp; | |
1396 | ||
b3a3290e DS |
1397 | if (!sockunion2hostprefix(&peer->su, &p)) { |
1398 | zlog_warn("%s: Unable to convert sockunion to prefix for %s", | |
1399 | __func__, peer->host); | |
1400 | return; | |
1401 | } | |
1402 | ||
1403 | if (p.family != AF_INET6) | |
1404 | return; | |
35aae5c9 DS |
1405 | /* |
1406 | * Gather the ifindex for if up/down events to be | |
1407 | * tagged into this fun | |
1408 | */ | |
1409 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
1410 | ifindex = peer->su.sin6.sin6_scope_id; | |
b3a3290e | 1411 | |
35aae5c9 | 1412 | bnc = bnc_find(&bgp->nexthop_cache_table[AFI_IP6], &p, 0, ifindex); |
b3a3290e DS |
1413 | if (!bnc) |
1414 | return; | |
1415 | ||
1416 | if (peer != bnc->nht_info) | |
1417 | return; | |
1418 | ||
1419 | for (nhop = bnc->nexthop; nhop; nhop = nhop->next) { | |
1420 | ifp = if_lookup_by_index(nhop->ifindex, nhop->vrf_id); | |
1421 | ||
68cecc3b DS |
1422 | if (!ifp) |
1423 | continue; | |
1424 | ||
b3a3290e DS |
1425 | zclient_send_interface_radv_req(zclient, nhop->vrf_id, ifp, 0, |
1426 | 0); | |
1427 | } | |
1428 | } | |
c589d847 AK |
1429 | |
1430 | /**************************************************************************** | |
1431 | * L3 NHGs are used for fast failover of nexthops in the dplane. These are | |
1432 | * the APIs for allocating L3 NHG ids. Management of the L3 NHG itself is | |
1433 | * left to the application using it. | |
1434 | * PS: Currently EVPN host routes is the only app using L3 NHG for fast | |
1435 | * failover of remote ES links. | |
1436 | ***************************************************************************/ | |
1437 | static bitfield_t bgp_nh_id_bitmap; | |
8bcb09a1 | 1438 | static uint32_t bgp_l3nhg_start; |
c589d847 | 1439 | |
8bcb09a1 AK |
1440 | /* XXX - currently we do nothing on the callbacks */ |
1441 | static void bgp_l3nhg_add_cb(const char *name) | |
1442 | { | |
1443 | } | |
f3c6dd49 DS |
1444 | |
1445 | static void bgp_l3nhg_modify_cb(const struct nexthop_group_cmd *nhgc) | |
1446 | { | |
1447 | } | |
1448 | ||
8bcb09a1 AK |
1449 | static void bgp_l3nhg_add_nexthop_cb(const struct nexthop_group_cmd *nhgc, |
1450 | const struct nexthop *nhop) | |
1451 | { | |
1452 | } | |
f3c6dd49 | 1453 | |
8bcb09a1 AK |
1454 | static void bgp_l3nhg_del_nexthop_cb(const struct nexthop_group_cmd *nhgc, |
1455 | const struct nexthop *nhop) | |
1456 | { | |
1457 | } | |
f3c6dd49 | 1458 | |
8bcb09a1 | 1459 | static void bgp_l3nhg_del_cb(const char *name) |
c589d847 | 1460 | { |
c589d847 AK |
1461 | } |
1462 | ||
8bcb09a1 | 1463 | static void bgp_l3nhg_zebra_init(void) |
c589d847 | 1464 | { |
8bcb09a1 AK |
1465 | static bool bgp_l3nhg_zebra_inited; |
1466 | if (bgp_l3nhg_zebra_inited) | |
c589d847 AK |
1467 | return; |
1468 | ||
8bcb09a1 AK |
1469 | bgp_l3nhg_zebra_inited = true; |
1470 | bgp_l3nhg_start = zclient_get_nhg_start(ZEBRA_ROUTE_BGP); | |
f3c6dd49 DS |
1471 | nexthop_group_init(bgp_l3nhg_add_cb, bgp_l3nhg_modify_cb, |
1472 | bgp_l3nhg_add_nexthop_cb, bgp_l3nhg_del_nexthop_cb, | |
1473 | bgp_l3nhg_del_cb); | |
c589d847 AK |
1474 | } |
1475 | ||
8bcb09a1 | 1476 | |
c589d847 AK |
1477 | void bgp_l3nhg_init(void) |
1478 | { | |
8bcb09a1 AK |
1479 | uint32_t id_max; |
1480 | ||
7a8ce9d5 | 1481 | id_max = MIN(ZEBRA_NHG_PROTO_SPACING - 1, 16 * 1024); |
8bcb09a1 | 1482 | bf_init(bgp_nh_id_bitmap, id_max); |
c589d847 | 1483 | bf_assign_zero_index(bgp_nh_id_bitmap); |
8bcb09a1 AK |
1484 | |
1485 | if (BGP_DEBUG(nht, NHT) || BGP_DEBUG(evpn_mh, EVPN_MH_ES)) | |
1486 | zlog_debug("bgp l3_nhg range %u - %u", bgp_l3nhg_start + 1, | |
1487 | bgp_l3nhg_start + id_max); | |
c589d847 AK |
1488 | } |
1489 | ||
1490 | void bgp_l3nhg_finish(void) | |
1491 | { | |
1492 | bf_free(bgp_nh_id_bitmap); | |
1493 | } | |
8bcb09a1 AK |
1494 | |
1495 | uint32_t bgp_l3nhg_id_alloc(void) | |
1496 | { | |
1497 | uint32_t nhg_id = 0; | |
1498 | ||
1499 | bgp_l3nhg_zebra_init(); | |
1500 | bf_assign_index(bgp_nh_id_bitmap, nhg_id); | |
1501 | if (nhg_id) | |
1502 | nhg_id += bgp_l3nhg_start; | |
1503 | ||
1504 | return nhg_id; | |
1505 | } | |
1506 | ||
1507 | void bgp_l3nhg_id_free(uint32_t nhg_id) | |
1508 | { | |
1509 | if (!nhg_id || (nhg_id <= bgp_l3nhg_start)) | |
1510 | return; | |
1511 | ||
1512 | nhg_id -= bgp_l3nhg_start; | |
1513 | ||
1514 | bf_release_index(bgp_nh_id_bitmap, nhg_id); | |
1515 | } |