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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 | ||
1bb550b6 PG |
64 | static int bgp_isvalid_nexthop_for_mplsovergre(struct bgp_nexthop_cache *bnc, |
65 | struct bgp_path_info *path) | |
66 | { | |
67 | struct interface *ifp = NULL; | |
68 | struct nexthop *nexthop; | |
69 | ||
70 | for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next) { | |
71 | if (nexthop->type != NEXTHOP_TYPE_BLACKHOLE) { | |
72 | ifp = if_lookup_by_index( | |
73 | bnc->ifindex ? bnc->ifindex : nexthop->ifindex, | |
74 | bnc->bgp->vrf_id); | |
75 | if (ifp && (ifp->ll_type == ZEBRA_LLT_IPGRE || | |
76 | ifp->ll_type == ZEBRA_LLT_IP6GRE)) | |
77 | break; | |
78 | } | |
79 | } | |
80 | if (!ifp) | |
81 | return false; | |
82 | ||
83 | if (CHECK_FLAG(path->attr->rmap_change_flags, | |
84 | BATTR_RMAP_L3VPN_ACCEPT_GRE)) | |
85 | return true; | |
86 | ||
87 | return false; | |
88 | } | |
89 | ||
90 | static int bgp_isvalid_nexthop_for_mpls(struct bgp_nexthop_cache *bnc, | |
91 | struct bgp_path_info *path) | |
960035b2 | 92 | { |
7f8c7d91 | 93 | /* |
1bb550b6 | 94 | * - In the case of MPLS-VPN, the label is learned from LDP or other |
7f8c7d91 HS |
95 | * protocols, and nexthop tracking is enabled for the label. |
96 | * The value is recorded as BGP_NEXTHOP_LABELED_VALID. | |
1bb550b6 | 97 | * - In the case of SRv6-VPN, we need to track the reachability to the |
7f8c7d91 HS |
98 | * SID (in other words, IPv6 address). As in MPLS, we need to record |
99 | * the value as BGP_NEXTHOP_SID_VALID. However, this function is | |
100 | * currently not implemented, and this function assumes that all | |
101 | * Transit routes for SRv6-VPN are valid. | |
1bb550b6 | 102 | * - Otherwise check for mpls-gre acceptance |
7f8c7d91 | 103 | */ |
1bb550b6 PG |
104 | return (bgp_zebra_num_connects() == 0 || |
105 | (bnc && (bnc->nexthop_num > 0 && | |
106 | (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_LABELED_VALID) || | |
107 | bnc->bgp->srv6_enabled || | |
108 | bgp_isvalid_nexthop_for_mplsovergre(bnc, path))))); | |
960035b2 PZ |
109 | } |
110 | ||
d62a17ae | 111 | static void bgp_unlink_nexthop_check(struct bgp_nexthop_cache *bnc) |
fb018d25 | 112 | { |
d5c4bac9 | 113 | if (LIST_EMPTY(&(bnc->paths)) && !bnc->nht_info) { |
036f482f DA |
114 | if (BGP_DEBUG(nht, NHT)) |
115 | zlog_debug("%s: freeing bnc %pFX(%d)(%u)(%s)", __func__, | |
116 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 117 | bnc->bgp->name_pretty); |
e37e1e27 PR |
118 | /* only unregister if this is the last nh for this prefix*/ |
119 | if (!bnc_existing_for_prefix(bnc)) | |
23f60ffd | 120 | unregister_zebra_rnh(bnc); |
d62a17ae | 121 | bnc_free(bnc); |
fb018d25 | 122 | } |
fb018d25 DS |
123 | } |
124 | ||
4b7e6066 | 125 | void bgp_unlink_nexthop(struct bgp_path_info *path) |
f9164b1d | 126 | { |
d62a17ae | 127 | struct bgp_nexthop_cache *bnc = path->nexthop; |
128 | ||
129 | if (!bnc) | |
130 | return; | |
f9164b1d | 131 | |
7f040da1 | 132 | path_nh_map(path, NULL, false); |
f9164b1d | 133 | |
d62a17ae | 134 | bgp_unlink_nexthop_check(bnc); |
f9164b1d PJ |
135 | } |
136 | ||
996319e6 DS |
137 | void bgp_replace_nexthop_by_peer(struct peer *from, struct peer *to) |
138 | { | |
139 | struct prefix pp; | |
140 | struct prefix pt; | |
141 | struct bgp_nexthop_cache *bncp, *bnct; | |
142 | afi_t afi; | |
35aae5c9 | 143 | ifindex_t ifindex = 0; |
996319e6 DS |
144 | |
145 | if (!sockunion2hostprefix(&from->su, &pp)) | |
146 | return; | |
147 | ||
35aae5c9 DS |
148 | /* |
149 | * Gather the ifindex for if up/down events to be | |
150 | * tagged into this fun | |
151 | */ | |
152 | if (from->conf_if && IN6_IS_ADDR_LINKLOCAL(&from->su.sin6.sin6_addr)) | |
153 | ifindex = from->su.sin6.sin6_scope_id; | |
154 | ||
996319e6 | 155 | afi = family2afi(pp.family); |
35aae5c9 | 156 | bncp = bnc_find(&from->bgp->nexthop_cache_table[afi], &pp, 0, ifindex); |
996319e6 DS |
157 | |
158 | if (!sockunion2hostprefix(&to->su, &pt)) | |
159 | return; | |
160 | ||
35aae5c9 DS |
161 | /* |
162 | * Gather the ifindex for if up/down events to be | |
163 | * tagged into this fun | |
164 | */ | |
165 | ifindex = 0; | |
166 | if (to->conf_if && IN6_IS_ADDR_LINKLOCAL(&to->su.sin6.sin6_addr)) | |
167 | ifindex = to->su.sin6.sin6_scope_id; | |
168 | bnct = bnc_find(&to->bgp->nexthop_cache_table[afi], &pt, 0, ifindex); | |
996319e6 DS |
169 | |
170 | if (bnct != bncp) | |
171 | return; | |
172 | ||
173 | if (bnct) | |
174 | bnct->nht_info = to; | |
175 | } | |
176 | ||
d62a17ae | 177 | void bgp_unlink_nexthop_by_peer(struct peer *peer) |
f9164b1d | 178 | { |
d62a17ae | 179 | struct prefix p; |
d62a17ae | 180 | struct bgp_nexthop_cache *bnc; |
181 | afi_t afi = family2afi(peer->su.sa.sa_family); | |
35aae5c9 | 182 | ifindex_t ifindex = 0; |
d62a17ae | 183 | |
184 | if (!sockunion2hostprefix(&peer->su, &p)) | |
185 | return; | |
35aae5c9 DS |
186 | /* |
187 | * Gather the ifindex for if up/down events to be | |
188 | * tagged into this fun | |
189 | */ | |
190 | if (afi == AFI_IP6 && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
191 | ifindex = peer->su.sin6.sin6_scope_id; | |
192 | bnc = bnc_find(&peer->bgp->nexthop_cache_table[afi], &p, 0, ifindex); | |
14315f2d | 193 | if (!bnc) |
d62a17ae | 194 | return; |
195 | ||
d62a17ae | 196 | /* cleanup the peer reference */ |
197 | bnc->nht_info = NULL; | |
198 | ||
199 | bgp_unlink_nexthop_check(bnc); | |
f9164b1d PJ |
200 | } |
201 | ||
960035b2 PZ |
202 | /* |
203 | * A route and its nexthop might belong to different VRFs. Therefore, | |
204 | * we need both the bgp_route and bgp_nexthop pointers. | |
205 | */ | |
206 | int bgp_find_or_add_nexthop(struct bgp *bgp_route, struct bgp *bgp_nexthop, | |
4053e952 | 207 | afi_t afi, safi_t safi, struct bgp_path_info *pi, |
654a5978 PG |
208 | struct peer *peer, int connected, |
209 | const struct prefix *orig_prefix) | |
fb018d25 | 210 | { |
f663c581 | 211 | struct bgp_nexthop_cache_head *tree = NULL; |
d62a17ae | 212 | struct bgp_nexthop_cache *bnc; |
213 | struct prefix p; | |
545aeef1 | 214 | uint32_t srte_color = 0; |
d62a17ae | 215 | int is_bgp_static_route = 0; |
8761cd6d | 216 | ifindex_t ifindex = 0; |
d62a17ae | 217 | |
40381db7 DS |
218 | if (pi) { |
219 | is_bgp_static_route = ((pi->type == ZEBRA_ROUTE_BGP) | |
220 | && (pi->sub_type == BGP_ROUTE_STATIC)) | |
d62a17ae | 221 | ? 1 |
222 | : 0; | |
223 | ||
224 | /* Since Extended Next-hop Encoding (RFC5549) support, we want | |
225 | to derive | |
226 | address-family from the next-hop. */ | |
227 | if (!is_bgp_static_route) | |
7226bc40 TA |
228 | afi = BGP_ATTR_MP_NEXTHOP_LEN_IP6(pi->attr) ? AFI_IP6 |
229 | : AFI_IP; | |
d62a17ae | 230 | |
92d6f769 K |
231 | /* Validation for the ipv4 mapped ipv6 nexthop. */ |
232 | if (IS_MAPPED_IPV6(&pi->attr->mp_nexthop_global)) { | |
233 | afi = AFI_IP; | |
234 | } | |
235 | ||
2951a7a4 | 236 | /* This will return true if the global IPv6 NH is a link local |
d62a17ae | 237 | * addr */ |
40381db7 | 238 | if (make_prefix(afi, pi, &p) < 0) |
d62a17ae | 239 | return 1; |
545aeef1 | 240 | |
654a5978 PG |
241 | if (!is_bgp_static_route && orig_prefix |
242 | && prefix_same(&p, orig_prefix)) { | |
243 | if (BGP_DEBUG(nht, NHT)) { | |
244 | zlog_debug( | |
245 | "%s(%pFX): prefix loops through itself", | |
246 | __func__, &p); | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
545aeef1 | 251 | srte_color = pi->attr->srte_color; |
d62a17ae | 252 | } else if (peer) { |
8761cd6d DS |
253 | /* |
254 | * Gather the ifindex for if up/down events to be | |
255 | * tagged into this fun | |
256 | */ | |
35aae5c9 DS |
257 | if (afi == AFI_IP6 && |
258 | IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) { | |
8761cd6d | 259 | ifindex = peer->su.sin6.sin6_scope_id; |
35aae5c9 DS |
260 | if (ifindex == 0) { |
261 | if (BGP_DEBUG(nht, NHT)) { | |
262 | zlog_debug( | |
263 | "%s: Unable to locate ifindex, waiting till we have one", | |
264 | peer->conf_if); | |
265 | } | |
266 | return 0; | |
267 | } | |
268 | } | |
8761cd6d | 269 | |
d62a17ae | 270 | if (!sockunion2hostprefix(&peer->su, &p)) { |
271 | if (BGP_DEBUG(nht, NHT)) { | |
272 | zlog_debug( | |
273 | "%s: Attempting to register with unknown AFI %d (not %d or %d)", | |
15569c58 | 274 | __func__, afi, AFI_IP, AFI_IP6); |
d62a17ae | 275 | } |
276 | return 0; | |
277 | } | |
278 | } else | |
279 | return 0; | |
280 | ||
281 | if (is_bgp_static_route) | |
f663c581 | 282 | tree = &bgp_nexthop->import_check_table[afi]; |
d62a17ae | 283 | else |
f663c581 | 284 | tree = &bgp_nexthop->nexthop_cache_table[afi]; |
d62a17ae | 285 | |
35aae5c9 | 286 | bnc = bnc_find(tree, &p, srte_color, ifindex); |
14315f2d | 287 | if (!bnc) { |
35aae5c9 | 288 | bnc = bnc_new(tree, &p, srte_color, ifindex); |
960035b2 | 289 | bnc->bgp = bgp_nexthop; |
036f482f DA |
290 | if (BGP_DEBUG(nht, NHT)) |
291 | zlog_debug("Allocated bnc %pFX(%d)(%u)(%s) peer %p", | |
292 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 293 | bnc->bgp->name_pretty, peer); |
4115b296 | 294 | } else { |
036f482f | 295 | if (BGP_DEBUG(nht, NHT)) |
4115b296 | 296 | zlog_debug( |
036f482f DA |
297 | "Found existing bnc %pFX(%d)(%s) flags 0x%x ifindex %d #paths %d peer %p", |
298 | &bnc->prefix, bnc->ifindex, | |
299 | bnc->bgp->name_pretty, bnc->flags, bnc->ifindex, | |
300 | bnc->path_count, bnc->nht_info); | |
fc9a856f | 301 | } |
d62a17ae | 302 | |
021b6596 AD |
303 | if (pi && is_route_parent_evpn(pi)) |
304 | bnc->is_evpn_gwip_nexthop = true; | |
305 | ||
d62a17ae | 306 | if (is_bgp_static_route) { |
307 | SET_FLAG(bnc->flags, BGP_STATIC_ROUTE); | |
308 | ||
309 | /* If we're toggling the type, re-register */ | |
892fedb6 | 310 | if ((CHECK_FLAG(bgp_route->flags, BGP_FLAG_IMPORT_CHECK)) |
d62a17ae | 311 | && !CHECK_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH)) { |
312 | SET_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH); | |
313 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
314 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
892fedb6 DA |
315 | } else if ((!CHECK_FLAG(bgp_route->flags, |
316 | BGP_FLAG_IMPORT_CHECK)) | |
d62a17ae | 317 | && CHECK_FLAG(bnc->flags, |
318 | BGP_STATIC_ROUTE_EXACT_MATCH)) { | |
319 | UNSET_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH); | |
320 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
321 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
322 | } | |
078430f6 | 323 | } |
d62a17ae | 324 | /* When nexthop is already known, but now requires 'connected' |
325 | * resolution, | |
326 | * re-register it. The reverse scenario where the nexthop currently | |
327 | * requires | |
328 | * 'connected' resolution does not need a re-register (i.e., we treat | |
329 | * 'connected-required' as an override) except in the scenario where | |
330 | * this | |
331 | * is actually a case of tracking a peer for connectivity (e.g., after | |
332 | * disable connected-check). | |
333 | * NOTE: We don't track the number of paths separately for 'connected- | |
334 | * required' vs 'connected-not-required' as this change is not a common | |
335 | * scenario. | |
336 | */ | |
337 | else if (connected && !CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) { | |
338 | SET_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED); | |
339 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
340 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
341 | } else if (peer && !connected | |
342 | && CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) { | |
343 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED); | |
344 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
345 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
078430f6 | 346 | } |
4115b296 | 347 | if (peer && (bnc->ifindex != ifindex)) { |
348 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
349 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
350 | bnc->ifindex = ifindex; | |
351 | } | |
960035b2 | 352 | if (bgp_route->inst_type == BGP_INSTANCE_TYPE_VIEW) { |
1ee0a2df DS |
353 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
354 | SET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
b54892e0 | 355 | } else if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED) |
f663c581 | 356 | && !is_default_host_route(&bnc->prefix)) |
23f60ffd | 357 | register_zebra_rnh(bnc); |
1eb6c3ea | 358 | |
40381db7 | 359 | if (pi && pi->nexthop != bnc) { |
d62a17ae | 360 | /* Unlink from existing nexthop cache, if any. This will also |
361 | * free | |
362 | * the nexthop cache entry, if appropriate. | |
363 | */ | |
40381db7 | 364 | bgp_unlink_nexthop(pi); |
d62a17ae | 365 | |
7f040da1 DS |
366 | /* updates NHT pi list reference */ |
367 | path_nh_map(pi, bnc, true); | |
d62a17ae | 368 | |
369 | if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID) && bnc->metric) | |
40381db7 DS |
370 | (bgp_path_info_extra_get(pi))->igpmetric = bnc->metric; |
371 | else if (pi->extra) | |
372 | pi->extra->igpmetric = 0; | |
996319e6 DS |
373 | } else if (peer) { |
374 | /* | |
4667220e | 375 | * Let's not accidentally save the peer data for a peer |
996319e6 DS |
376 | * we are going to throw away in a second or so. |
377 | * When we come back around we'll fix up this | |
378 | * data properly in replace_nexthop_by_peer | |
379 | */ | |
380 | if (CHECK_FLAG(peer->flags, PEER_FLAG_CONFIG_NODE)) | |
381 | bnc->nht_info = (void *)peer; /* NHT peer reference */ | |
382 | } | |
d62a17ae | 383 | |
384 | /* | |
385 | * We are cheating here. Views have no associated underlying | |
386 | * ability to detect nexthops. So when we have a view | |
387 | * just tell everyone the nexthop is valid | |
388 | */ | |
960035b2 | 389 | if (bgp_route->inst_type == BGP_INSTANCE_TYPE_VIEW) |
d62a17ae | 390 | return 1; |
1bb550b6 PG |
391 | else if (safi == SAFI_UNICAST && pi && |
392 | pi->sub_type == BGP_ROUTE_IMPORTED && pi->extra && | |
393 | pi->extra->num_labels && !bnc->is_evpn_gwip_nexthop) | |
394 | return bgp_isvalid_nexthop_for_mpls(bnc, pi); | |
395 | else | |
d62a17ae | 396 | return (bgp_isvalid_nexthop(bnc)); |
fb018d25 DS |
397 | } |
398 | ||
d62a17ae | 399 | void bgp_delete_connected_nexthop(afi_t afi, struct peer *peer) |
9a233a02 | 400 | { |
d62a17ae | 401 | struct bgp_nexthop_cache *bnc; |
402 | struct prefix p; | |
35aae5c9 | 403 | ifindex_t ifindex = 0; |
d62a17ae | 404 | |
405 | if (!peer) | |
406 | return; | |
407 | ||
d62a17ae | 408 | if (!sockunion2hostprefix(&peer->su, &p)) |
409 | return; | |
35aae5c9 DS |
410 | /* |
411 | * Gather the ifindex for if up/down events to be | |
412 | * tagged into this fun | |
413 | */ | |
414 | if (afi == AFI_IP6 && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
415 | ifindex = peer->su.sin6.sin6_scope_id; | |
f663c581 | 416 | bnc = bnc_find(&peer->bgp->nexthop_cache_table[family2afi(p.family)], |
35aae5c9 | 417 | &p, 0, ifindex); |
14315f2d DS |
418 | if (!bnc) { |
419 | if (BGP_DEBUG(nht, NHT)) | |
8c1a4c10 | 420 | zlog_debug( |
f663c581 | 421 | "Cannot find connected NHT node for peer %s(%s)", |
8c1a4c10 | 422 | peer->host, peer->bgp->name_pretty); |
14315f2d DS |
423 | return; |
424 | } | |
d62a17ae | 425 | |
426 | if (bnc->nht_info != peer) { | |
427 | if (BGP_DEBUG(nht, NHT)) | |
428 | zlog_debug( | |
8c1a4c10 DS |
429 | "Connected NHT %p node for peer %s(%s) points to %p", |
430 | bnc, peer->host, bnc->bgp->name_pretty, | |
431 | bnc->nht_info); | |
d62a17ae | 432 | return; |
433 | } | |
434 | ||
435 | bnc->nht_info = NULL; | |
436 | ||
437 | if (LIST_EMPTY(&(bnc->paths))) { | |
438 | if (BGP_DEBUG(nht, NHT)) | |
8c1a4c10 DS |
439 | zlog_debug( |
440 | "Freeing connected NHT node %p for peer %s(%s)", | |
441 | bnc, peer->host, bnc->bgp->name_pretty); | |
23f60ffd | 442 | unregister_zebra_rnh(bnc); |
d62a17ae | 443 | bnc_free(bnc); |
444 | } | |
9a233a02 DS |
445 | } |
446 | ||
545aeef1 | 447 | static void bgp_process_nexthop_update(struct bgp_nexthop_cache *bnc, |
9f002fa5 DS |
448 | struct zapi_route *nhr, |
449 | bool import_check) | |
fb018d25 | 450 | { |
d62a17ae | 451 | struct nexthop *nexthop; |
452 | struct nexthop *oldnh; | |
453 | struct nexthop *nhlist_head = NULL; | |
454 | struct nexthop *nhlist_tail = NULL; | |
d62a17ae | 455 | int i; |
021b6596 | 456 | bool evpn_resolved = false; |
14315f2d | 457 | |
083ec940 | 458 | bnc->last_update = monotime(NULL); |
d62a17ae | 459 | bnc->change_flags = 0; |
d62a17ae | 460 | |
461 | /* debug print the input */ | |
987a720a DS |
462 | if (BGP_DEBUG(nht, NHT)) { |
463 | char bnc_buf[BNC_FLAG_DUMP_SIZE]; | |
464 | ||
d62a17ae | 465 | zlog_debug( |
35aae5c9 | 466 | "%s(%u): Rcvd NH update %pFX(%u)%u) - metric %d/%d #nhops %d/%d flags %s", |
2dbe669b | 467 | bnc->bgp->name_pretty, bnc->bgp->vrf_id, &nhr->prefix, |
35aae5c9 | 468 | bnc->ifindex, bnc->srte_color, nhr->metric, bnc->metric, |
987a720a DS |
469 | nhr->nexthop_num, bnc->nexthop_num, |
470 | bgp_nexthop_dump_bnc_flags(bnc, bnc_buf, | |
471 | sizeof(bnc_buf))); | |
472 | } | |
d62a17ae | 473 | |
545aeef1 | 474 | if (nhr->metric != bnc->metric) |
d62a17ae | 475 | bnc->change_flags |= BGP_NEXTHOP_METRIC_CHANGED; |
476 | ||
545aeef1 | 477 | if (nhr->nexthop_num != bnc->nexthop_num) |
d62a17ae | 478 | bnc->change_flags |= BGP_NEXTHOP_CHANGED; |
479 | ||
9f002fa5 DS |
480 | if (import_check && (nhr->type == ZEBRA_ROUTE_BGP || |
481 | !prefix_same(&bnc->prefix, &nhr->prefix))) { | |
482 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
483 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
484 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_LABELED_VALID); | |
485 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_EVPN_INCOMPLETE); | |
486 | ||
487 | bnc_nexthop_free(bnc); | |
488 | bnc->nexthop = NULL; | |
489 | ||
490 | if (BGP_DEBUG(nht, NHT)) | |
491 | zlog_debug( | |
492 | "%s: Import Check does not resolve to the same prefix for %pFX received %pFX or matching route is BGP", | |
493 | __func__, &bnc->prefix, &nhr->prefix); | |
494 | } else if (nhr->nexthop_num) { | |
6137a77d DS |
495 | struct peer *peer = bnc->nht_info; |
496 | ||
d62a17ae | 497 | /* notify bgp fsm if nbr ip goes from invalid->valid */ |
498 | if (!bnc->nexthop_num) | |
499 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
500 | ||
021b6596 AD |
501 | if (!bnc->is_evpn_gwip_nexthop) |
502 | bnc->flags |= BGP_NEXTHOP_VALID; | |
545aeef1 RW |
503 | bnc->metric = nhr->metric; |
504 | bnc->nexthop_num = nhr->nexthop_num; | |
4a749e2c | 505 | |
960035b2 PZ |
506 | bnc->flags &= ~BGP_NEXTHOP_LABELED_VALID; /* check below */ |
507 | ||
545aeef1 | 508 | for (i = 0; i < nhr->nexthop_num; i++) { |
960035b2 PZ |
509 | int num_labels = 0; |
510 | ||
545aeef1 | 511 | nexthop = nexthop_from_zapi_nexthop(&nhr->nexthops[i]); |
d62a17ae | 512 | |
6137a77d DS |
513 | /* |
514 | * Turn on RA for the v6 nexthops | |
515 | * we receive from bgp. This is to allow us | |
516 | * to work with v4 routing over v6 nexthops | |
517 | */ | |
687a2b5d DS |
518 | if (peer && !peer->ifp |
519 | && CHECK_FLAG(peer->flags, | |
520 | PEER_FLAG_CAPABILITY_ENHE) | |
545aeef1 | 521 | && nhr->prefix.family == AF_INET6 |
65f803e8 | 522 | && nexthop->type != NEXTHOP_TYPE_BLACKHOLE) { |
6137a77d DS |
523 | struct interface *ifp; |
524 | ||
525 | ifp = if_lookup_by_index(nexthop->ifindex, | |
526 | nexthop->vrf_id); | |
8c9769e0 DS |
527 | if (ifp) |
528 | zclient_send_interface_radv_req( | |
529 | zclient, nexthop->vrf_id, ifp, | |
530 | true, | |
531 | BGP_UNNUM_DEFAULT_RA_INTERVAL); | |
6137a77d | 532 | } |
960035b2 PZ |
533 | /* There is at least one label-switched path */ |
534 | if (nexthop->nh_label && | |
535 | nexthop->nh_label->num_labels) { | |
536 | ||
537 | bnc->flags |= BGP_NEXTHOP_LABELED_VALID; | |
538 | num_labels = nexthop->nh_label->num_labels; | |
539 | } | |
540 | ||
d62a17ae | 541 | if (BGP_DEBUG(nht, NHT)) { |
542 | char buf[NEXTHOP_STRLEN]; | |
543 | zlog_debug( | |
960035b2 PZ |
544 | " nhop via %s (%d labels)", |
545 | nexthop2str(nexthop, buf, sizeof(buf)), | |
546 | num_labels); | |
d62a17ae | 547 | } |
548 | ||
549 | if (nhlist_tail) { | |
550 | nhlist_tail->next = nexthop; | |
551 | nhlist_tail = nexthop; | |
552 | } else { | |
553 | nhlist_tail = nexthop; | |
554 | nhlist_head = nexthop; | |
555 | } | |
556 | ||
557 | /* No need to evaluate the nexthop if we have already | |
558 | * determined | |
559 | * that there has been a change. | |
560 | */ | |
561 | if (bnc->change_flags & BGP_NEXTHOP_CHANGED) | |
562 | continue; | |
563 | ||
564 | for (oldnh = bnc->nexthop; oldnh; oldnh = oldnh->next) | |
78fba41b | 565 | if (nexthop_same(oldnh, nexthop)) |
d62a17ae | 566 | break; |
567 | ||
568 | if (!oldnh) | |
569 | bnc->change_flags |= BGP_NEXTHOP_CHANGED; | |
570 | } | |
571 | bnc_nexthop_free(bnc); | |
572 | bnc->nexthop = nhlist_head; | |
021b6596 AD |
573 | |
574 | /* | |
575 | * Gateway IP nexthop is L3 reachable. Mark it as | |
576 | * BGP_NEXTHOP_VALID only if it is recursively resolved with a | |
577 | * remote EVPN RT-2. | |
578 | * Else, mark it as BGP_NEXTHOP_EVPN_INCOMPLETE. | |
579 | * When its mapping with EVPN RT-2 is established, unset | |
580 | * BGP_NEXTHOP_EVPN_INCOMPLETE and set BGP_NEXTHOP_VALID. | |
581 | */ | |
582 | if (bnc->is_evpn_gwip_nexthop) { | |
583 | evpn_resolved = bgp_evpn_is_gateway_ip_resolved(bnc); | |
584 | ||
511211bf | 585 | if (BGP_DEBUG(nht, NHT)) |
021b6596 | 586 | zlog_debug( |
511211bf DA |
587 | "EVPN gateway IP %pFX recursive MAC/IP lookup %s", |
588 | &bnc->prefix, | |
021b6596 AD |
589 | (evpn_resolved ? "successful" |
590 | : "failed")); | |
021b6596 AD |
591 | |
592 | if (evpn_resolved) { | |
593 | bnc->flags |= BGP_NEXTHOP_VALID; | |
594 | bnc->flags &= ~BGP_NEXTHOP_EVPN_INCOMPLETE; | |
595 | bnc->change_flags |= BGP_NEXTHOP_MACIP_CHANGED; | |
596 | } else { | |
597 | bnc->flags |= BGP_NEXTHOP_EVPN_INCOMPLETE; | |
598 | bnc->flags &= ~BGP_NEXTHOP_VALID; | |
599 | } | |
600 | } | |
d62a17ae | 601 | } else { |
021b6596 | 602 | bnc->flags &= ~BGP_NEXTHOP_EVPN_INCOMPLETE; |
d62a17ae | 603 | bnc->flags &= ~BGP_NEXTHOP_VALID; |
c3b95419 | 604 | bnc->flags &= ~BGP_NEXTHOP_LABELED_VALID; |
545aeef1 | 605 | bnc->nexthop_num = nhr->nexthop_num; |
d62a17ae | 606 | |
607 | /* notify bgp fsm if nbr ip goes from valid->invalid */ | |
608 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
609 | ||
610 | bnc_nexthop_free(bnc); | |
611 | bnc->nexthop = NULL; | |
612 | } | |
613 | ||
614 | evaluate_paths(bnc); | |
fb018d25 DS |
615 | } |
616 | ||
8761cd6d DS |
617 | static void bgp_nht_ifp_table_handle(struct bgp *bgp, |
618 | struct bgp_nexthop_cache_head *table, | |
619 | struct interface *ifp, bool up) | |
620 | { | |
621 | struct bgp_nexthop_cache *bnc; | |
622 | ||
623 | frr_each (bgp_nexthop_cache, table, bnc) { | |
624 | if (bnc->ifindex != ifp->ifindex) | |
625 | continue; | |
626 | ||
083ec940 | 627 | bnc->last_update = monotime(NULL); |
8761cd6d DS |
628 | bnc->change_flags = 0; |
629 | ||
474cfe4a DS |
630 | /* |
631 | * For interface based routes ( ala the v6 LL routes | |
632 | * that this was written for ) the metric received | |
633 | * for the connected route is 0 not 1. | |
634 | */ | |
635 | bnc->metric = 0; | |
8761cd6d DS |
636 | if (up) { |
637 | SET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
638 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
8761cd6d DS |
639 | bnc->nexthop_num = 1; |
640 | } else { | |
641 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
642 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
643 | SET_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED); | |
644 | bnc->nexthop_num = 0; | |
8761cd6d DS |
645 | } |
646 | ||
647 | evaluate_paths(bnc); | |
648 | } | |
649 | } | |
650 | static void bgp_nht_ifp_handle(struct interface *ifp, bool up) | |
651 | { | |
652 | struct bgp *bgp; | |
653 | ||
096f7609 | 654 | bgp = ifp->vrf->info; |
8761cd6d DS |
655 | if (!bgp) |
656 | return; | |
657 | ||
7f2e9cce DS |
658 | bgp_nht_ifp_table_handle(bgp, &bgp->nexthop_cache_table[AFI_IP], ifp, |
659 | up); | |
660 | bgp_nht_ifp_table_handle(bgp, &bgp->import_check_table[AFI_IP], ifp, | |
661 | up); | |
8761cd6d DS |
662 | bgp_nht_ifp_table_handle(bgp, &bgp->nexthop_cache_table[AFI_IP6], ifp, |
663 | up); | |
664 | bgp_nht_ifp_table_handle(bgp, &bgp->import_check_table[AFI_IP6], ifp, | |
665 | up); | |
666 | } | |
667 | ||
668 | void bgp_nht_ifp_up(struct interface *ifp) | |
669 | { | |
670 | bgp_nht_ifp_handle(ifp, true); | |
671 | } | |
672 | ||
673 | void bgp_nht_ifp_down(struct interface *ifp) | |
674 | { | |
675 | bgp_nht_ifp_handle(ifp, false); | |
676 | } | |
677 | ||
cc9f21da | 678 | static void bgp_nht_ifp_initial(struct thread *thread) |
8761cd6d DS |
679 | { |
680 | ifindex_t ifindex = THREAD_VAL(thread); | |
0b52b75a IR |
681 | struct bgp *bgp = THREAD_ARG(thread); |
682 | struct interface *ifp = if_lookup_by_index(ifindex, bgp->vrf_id); | |
8761cd6d DS |
683 | |
684 | if (!ifp) | |
cc9f21da | 685 | return; |
8761cd6d | 686 | |
4115b296 | 687 | if (BGP_DEBUG(nht, NHT)) |
688 | zlog_debug( | |
689 | "Handle NHT initial update for Intf %s(%d) status %s", | |
690 | ifp->name, ifp->ifindex, if_is_up(ifp) ? "up" : "down"); | |
691 | ||
8761cd6d DS |
692 | if (if_is_up(ifp)) |
693 | bgp_nht_ifp_up(ifp); | |
694 | else | |
695 | bgp_nht_ifp_down(ifp); | |
8761cd6d DS |
696 | } |
697 | ||
698 | /* | |
699 | * So the bnc code has the ability to handle interface up/down | |
700 | * events to properly handle v6 LL peering. | |
701 | * What is happening here: | |
702 | * The event system for peering expects the nht code to | |
703 | * report on the tracking events after we move to active | |
704 | * So let's give the system a chance to report on that event | |
705 | * in a manner that is expected. | |
706 | */ | |
707 | void bgp_nht_interface_events(struct peer *peer) | |
708 | { | |
709 | struct bgp *bgp = peer->bgp; | |
710 | struct bgp_nexthop_cache_head *table; | |
711 | struct bgp_nexthop_cache *bnc; | |
712 | struct prefix p; | |
35aae5c9 | 713 | ifindex_t ifindex = 0; |
8761cd6d DS |
714 | |
715 | if (!IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
716 | return; | |
717 | ||
718 | if (!sockunion2hostprefix(&peer->su, &p)) | |
719 | return; | |
35aae5c9 DS |
720 | /* |
721 | * Gather the ifindex for if up/down events to be | |
722 | * tagged into this fun | |
723 | */ | |
724 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
725 | ifindex = peer->su.sin6.sin6_scope_id; | |
8761cd6d DS |
726 | |
727 | table = &bgp->nexthop_cache_table[AFI_IP6]; | |
35aae5c9 | 728 | bnc = bnc_find(table, &p, 0, ifindex); |
8761cd6d DS |
729 | if (!bnc) |
730 | return; | |
731 | ||
732 | if (bnc->ifindex) | |
0b52b75a | 733 | thread_add_event(bm->master, bgp_nht_ifp_initial, bnc->bgp, |
8761cd6d DS |
734 | bnc->ifindex, NULL); |
735 | } | |
736 | ||
545aeef1 RW |
737 | void bgp_parse_nexthop_update(int command, vrf_id_t vrf_id) |
738 | { | |
739 | struct bgp_nexthop_cache_head *tree = NULL; | |
b8210849 | 740 | struct bgp_nexthop_cache *bnc_nhc, *bnc_import; |
545aeef1 | 741 | struct bgp *bgp; |
06e4e901 | 742 | struct prefix match; |
545aeef1 RW |
743 | struct zapi_route nhr; |
744 | afi_t afi; | |
745 | ||
746 | bgp = bgp_lookup_by_vrf_id(vrf_id); | |
747 | if (!bgp) { | |
748 | flog_err( | |
749 | EC_BGP_NH_UPD, | |
750 | "parse nexthop update: instance not found for vrf_id %u", | |
751 | vrf_id); | |
752 | return; | |
753 | } | |
754 | ||
06e4e901 | 755 | if (!zapi_nexthop_update_decode(zclient->ibuf, &match, &nhr)) { |
cc42c4f0 DS |
756 | zlog_err("%s[%s]: Failure to decode nexthop update", __func__, |
757 | bgp->name_pretty); | |
545aeef1 RW |
758 | return; |
759 | } | |
760 | ||
06e4e901 | 761 | afi = family2afi(match.family); |
b8210849 | 762 | tree = &bgp->nexthop_cache_table[afi]; |
545aeef1 | 763 | |
35aae5c9 | 764 | bnc_nhc = bnc_find(tree, &match, nhr.srte_color, 0); |
b8210849 DS |
765 | if (!bnc_nhc) { |
766 | if (BGP_DEBUG(nht, NHT)) | |
767 | zlog_debug( | |
768 | "parse nexthop update(%pFX(%u)(%s)): bnc info not found for nexthop cache", | |
769 | &nhr.prefix, nhr.srte_color, bgp->name_pretty); | |
770 | } else | |
9f002fa5 | 771 | bgp_process_nexthop_update(bnc_nhc, &nhr, false); |
b8210849 DS |
772 | |
773 | tree = &bgp->import_check_table[afi]; | |
774 | ||
35aae5c9 | 775 | bnc_import = bnc_find(tree, &match, nhr.srte_color, 0); |
b8210849 | 776 | if (!bnc_import) { |
2dbe669b | 777 | if (BGP_DEBUG(nht, NHT)) |
545aeef1 | 778 | zlog_debug( |
b8210849 | 779 | "parse nexthop update(%pFX(%u)(%s)): bnc info not found for import check", |
2dbe669b | 780 | &nhr.prefix, nhr.srte_color, bgp->name_pretty); |
d00a5f6b DS |
781 | } else |
782 | bgp_process_nexthop_update(bnc_import, &nhr, true); | |
545aeef1 | 783 | |
545aeef1 RW |
784 | /* |
785 | * HACK: if any BGP route is dependant on an SR-policy that doesn't | |
786 | * exist, zebra will never send NH updates relative to that policy. In | |
787 | * that case, whenever we receive an update about a colorless NH, update | |
788 | * the corresponding colorful NHs that share the same endpoint but that | |
789 | * are inactive. This ugly hack should work around the problem at the | |
790 | * cost of a performance pernalty. Long term, what should be done is to | |
791 | * make zebra's RNH subsystem aware of SR-TE colors (like bgpd is), | |
792 | * which should provide a better infrastructure to solve this issue in | |
793 | * a more efficient and elegant way. | |
794 | */ | |
b8210849 | 795 | if (nhr.srte_color == 0 && bnc_nhc) { |
545aeef1 RW |
796 | struct bgp_nexthop_cache *bnc_iter; |
797 | ||
798 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], | |
799 | bnc_iter) { | |
d00a5f6b DS |
800 | if (!prefix_same(&bnc_nhc->prefix, &bnc_iter->prefix) || |
801 | bnc_iter->srte_color == 0 || | |
802 | CHECK_FLAG(bnc_iter->flags, BGP_NEXTHOP_VALID)) | |
545aeef1 RW |
803 | continue; |
804 | ||
9f002fa5 | 805 | bgp_process_nexthop_update(bnc_iter, &nhr, false); |
545aeef1 RW |
806 | } |
807 | } | |
808 | } | |
809 | ||
ee7ca6c0 | 810 | /* |
811 | * Cleanup nexthop registration and status information for BGP nexthops | |
812 | * pertaining to this VRF. This is invoked upon VRF deletion. | |
813 | */ | |
814 | void bgp_cleanup_nexthops(struct bgp *bgp) | |
815 | { | |
f663c581 RW |
816 | for (afi_t afi = AFI_IP; afi < AFI_MAX; afi++) { |
817 | struct bgp_nexthop_cache *bnc; | |
ee7ca6c0 | 818 | |
f663c581 RW |
819 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], |
820 | bnc) { | |
ee7ca6c0 | 821 | /* Clear relevant flags. */ |
822 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID); | |
823 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
824 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); | |
021b6596 | 825 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_EVPN_INCOMPLETE); |
ee7ca6c0 | 826 | } |
827 | } | |
828 | } | |
829 | ||
fb018d25 DS |
830 | /** |
831 | * make_prefix - make a prefix structure from the path (essentially | |
832 | * path's node. | |
833 | */ | |
40381db7 | 834 | static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p) |
fb018d25 | 835 | { |
078430f6 | 836 | |
40381db7 DS |
837 | int is_bgp_static = ((pi->type == ZEBRA_ROUTE_BGP) |
838 | && (pi->sub_type == BGP_ROUTE_STATIC)) | |
d62a17ae | 839 | ? 1 |
840 | : 0; | |
9bcb3eef DS |
841 | struct bgp_dest *net = pi->net; |
842 | const struct prefix *p_orig = bgp_dest_get_prefix(net); | |
92d6f769 | 843 | struct in_addr ipv4; |
0378bcaa PG |
844 | |
845 | if (p_orig->family == AF_FLOWSPEC) { | |
846 | if (!pi->peer) | |
847 | return -1; | |
848 | return bgp_flowspec_get_first_nh(pi->peer->bgp, | |
1840384b | 849 | pi, p, afi); |
0378bcaa | 850 | } |
d62a17ae | 851 | memset(p, 0, sizeof(struct prefix)); |
852 | switch (afi) { | |
853 | case AFI_IP: | |
854 | p->family = AF_INET; | |
855 | if (is_bgp_static) { | |
b54892e0 DS |
856 | p->u.prefix4 = p_orig->u.prefix4; |
857 | p->prefixlen = p_orig->prefixlen; | |
d62a17ae | 858 | } else { |
92d6f769 K |
859 | if (IS_MAPPED_IPV6(&pi->attr->mp_nexthop_global)) { |
860 | ipv4_mapped_ipv6_to_ipv4( | |
861 | &pi->attr->mp_nexthop_global, &ipv4); | |
862 | p->u.prefix4 = ipv4; | |
863 | p->prefixlen = IPV4_MAX_BITLEN; | |
864 | } else { | |
7226bc40 TA |
865 | if (p_orig->family == AF_EVPN) |
866 | p->u.prefix4 = | |
867 | pi->attr->mp_nexthop_global_in; | |
868 | else | |
869 | p->u.prefix4 = pi->attr->nexthop; | |
92d6f769 K |
870 | p->prefixlen = IPV4_MAX_BITLEN; |
871 | } | |
d62a17ae | 872 | } |
873 | break; | |
874 | case AFI_IP6: | |
d62a17ae | 875 | p->family = AF_INET6; |
876 | ||
877 | if (is_bgp_static) { | |
b54892e0 DS |
878 | p->u.prefix6 = p_orig->u.prefix6; |
879 | p->prefixlen = p_orig->prefixlen; | |
d62a17ae | 880 | } else { |
606fdbb1 DA |
881 | /* If we receive MP_REACH nexthop with ::(LL) |
882 | * or LL(LL), use LL address as nexthop cache. | |
883 | */ | |
884 | if (pi->attr->mp_nexthop_len | |
885 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL | |
886 | && (IN6_IS_ADDR_UNSPECIFIED( | |
887 | &pi->attr->mp_nexthop_global) | |
888 | || IN6_IS_ADDR_LINKLOCAL( | |
889 | &pi->attr->mp_nexthop_global))) | |
890 | p->u.prefix6 = pi->attr->mp_nexthop_local; | |
17ef5a93 PG |
891 | /* If we receive MR_REACH with (GA)::(LL) |
892 | * then check for route-map to choose GA or LL | |
893 | */ | |
894 | else if (pi->attr->mp_nexthop_len | |
895 | == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) { | |
896 | if (pi->attr->mp_nexthop_prefer_global) | |
897 | p->u.prefix6 = | |
898 | pi->attr->mp_nexthop_global; | |
899 | else | |
900 | p->u.prefix6 = | |
901 | pi->attr->mp_nexthop_local; | |
902 | } else | |
606fdbb1 | 903 | p->u.prefix6 = pi->attr->mp_nexthop_global; |
d62a17ae | 904 | p->prefixlen = IPV6_MAX_BITLEN; |
905 | } | |
906 | break; | |
907 | default: | |
908 | if (BGP_DEBUG(nht, NHT)) { | |
909 | zlog_debug( | |
910 | "%s: Attempting to make prefix with unknown AFI %d (not %d or %d)", | |
15569c58 | 911 | __func__, afi, AFI_IP, AFI_IP6); |
d62a17ae | 912 | } |
913 | break; | |
65740e1b | 914 | } |
d62a17ae | 915 | return 0; |
fb018d25 DS |
916 | } |
917 | ||
918 | /** | |
078430f6 | 919 | * sendmsg_zebra_rnh -- Format and send a nexthop register/Unregister |
fb018d25 DS |
920 | * command to Zebra. |
921 | * ARGUMENTS: | |
922 | * struct bgp_nexthop_cache *bnc -- the nexthop structure. | |
078430f6 | 923 | * int command -- command to send to zebra |
fb018d25 DS |
924 | * RETURNS: |
925 | * void. | |
926 | */ | |
d62a17ae | 927 | static void sendmsg_zebra_rnh(struct bgp_nexthop_cache *bnc, int command) |
fb018d25 | 928 | { |
3c192540 | 929 | bool exact_match = false; |
ed6cec97 | 930 | bool resolve_via_default = false; |
d62a17ae | 931 | int ret; |
932 | ||
3c192540 | 933 | if (!zclient) |
d62a17ae | 934 | return; |
935 | ||
936 | /* Don't try to register if Zebra doesn't know of this instance. */ | |
bb4ef1ae DS |
937 | if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bnc->bgp)) { |
938 | if (BGP_DEBUG(zebra, ZEBRA)) | |
15569c58 DA |
939 | zlog_debug( |
940 | "%s: No zebra instance to talk to, not installing NHT entry", | |
941 | __func__); | |
d62a17ae | 942 | return; |
bb4ef1ae | 943 | } |
d62a17ae | 944 | |
1ee0a2df DS |
945 | if (!bgp_zebra_num_connects()) { |
946 | if (BGP_DEBUG(zebra, ZEBRA)) | |
15569c58 DA |
947 | zlog_debug( |
948 | "%s: We have not connected yet, cannot send nexthops", | |
949 | __func__); | |
1ee0a2df | 950 | } |
ed6cec97 DS |
951 | if (command == ZEBRA_NEXTHOP_REGISTER) { |
952 | if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED)) | |
953 | exact_match = true; | |
954 | if (CHECK_FLAG(bnc->flags, BGP_STATIC_ROUTE_EXACT_MATCH)) | |
955 | resolve_via_default = true; | |
956 | } | |
d62a17ae | 957 | |
f663c581 RW |
958 | if (BGP_DEBUG(zebra, ZEBRA)) |
959 | zlog_debug("%s: sending cmd %s for %pFX (vrf %s)", __func__, | |
960 | zserv_command_string(command), &bnc->prefix, | |
961 | bnc->bgp->name_pretty); | |
960035b2 | 962 | |
eb3c9d97 DL |
963 | ret = zclient_send_rnh(zclient, command, &bnc->prefix, SAFI_UNICAST, |
964 | exact_match, resolve_via_default, | |
965 | bnc->bgp->vrf_id); | |
a6522038 | 966 | if (ret == ZCLIENT_SEND_FAILURE) { |
e50f7cfd | 967 | flog_warn(EC_BGP_ZEBRA_SEND, |
f162a5b9 | 968 | "sendmsg_nexthop: zclient_send_message() failed"); |
a6522038 | 969 | return; |
970 | } | |
d62a17ae | 971 | |
3d174ce0 | 972 | if (command == ZEBRA_NEXTHOP_REGISTER) |
d62a17ae | 973 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
3d174ce0 | 974 | else if (command == ZEBRA_NEXTHOP_UNREGISTER) |
d62a17ae | 975 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); |
976 | return; | |
fb018d25 DS |
977 | } |
978 | ||
979 | /** | |
078430f6 DS |
980 | * register_zebra_rnh - register a NH/route with Zebra for notification |
981 | * when the route or the route to the nexthop changes. | |
fb018d25 | 982 | * ARGUMENTS: |
078430f6 | 983 | * struct bgp_nexthop_cache *bnc |
fb018d25 DS |
984 | * RETURNS: |
985 | * void. | |
986 | */ | |
23f60ffd | 987 | static void register_zebra_rnh(struct bgp_nexthop_cache *bnc) |
fb018d25 | 988 | { |
d62a17ae | 989 | /* Check if we have already registered */ |
990 | if (bnc->flags & BGP_NEXTHOP_REGISTERED) | |
991 | return; | |
8761cd6d DS |
992 | |
993 | if (bnc->ifindex) { | |
994 | SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
995 | return; | |
996 | } | |
997 | ||
3d174ce0 | 998 | sendmsg_zebra_rnh(bnc, ZEBRA_NEXTHOP_REGISTER); |
fb018d25 DS |
999 | } |
1000 | ||
1001 | /** | |
078430f6 | 1002 | * unregister_zebra_rnh -- Unregister the route/nexthop from Zebra. |
fb018d25 | 1003 | * ARGUMENTS: |
078430f6 | 1004 | * struct bgp_nexthop_cache *bnc |
fb018d25 DS |
1005 | * RETURNS: |
1006 | * void. | |
1007 | */ | |
23f60ffd | 1008 | static void unregister_zebra_rnh(struct bgp_nexthop_cache *bnc) |
fb018d25 | 1009 | { |
d62a17ae | 1010 | /* Check if we have already registered */ |
1011 | if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED)) | |
1012 | return; | |
1013 | ||
8761cd6d DS |
1014 | if (bnc->ifindex) { |
1015 | UNSET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED); | |
1016 | return; | |
1017 | } | |
1018 | ||
3d174ce0 | 1019 | sendmsg_zebra_rnh(bnc, ZEBRA_NEXTHOP_UNREGISTER); |
fb018d25 DS |
1020 | } |
1021 | ||
1022 | /** | |
1023 | * evaluate_paths - Evaluate the paths/nets associated with a nexthop. | |
1024 | * ARGUMENTS: | |
1025 | * struct bgp_nexthop_cache *bnc -- the nexthop structure. | |
1026 | * RETURNS: | |
1027 | * void. | |
1028 | */ | |
021b6596 | 1029 | void evaluate_paths(struct bgp_nexthop_cache *bnc) |
fb018d25 | 1030 | { |
9bcb3eef | 1031 | struct bgp_dest *dest; |
4b7e6066 | 1032 | struct bgp_path_info *path; |
d62a17ae | 1033 | int afi; |
1034 | struct peer *peer = (struct peer *)bnc->nht_info; | |
1035 | struct bgp_table *table; | |
1036 | safi_t safi; | |
960035b2 | 1037 | struct bgp *bgp_path; |
b54892e0 | 1038 | const struct prefix *p; |
d62a17ae | 1039 | |
1040 | if (BGP_DEBUG(nht, NHT)) { | |
987a720a | 1041 | char bnc_buf[BNC_FLAG_DUMP_SIZE]; |
df2a41a9 | 1042 | char chg_buf[BNC_FLAG_DUMP_SIZE]; |
987a720a | 1043 | |
d62a17ae | 1044 | zlog_debug( |
036f482f DA |
1045 | "NH update for %pFX(%d)(%u)(%s) - flags %s chgflags %s- evaluate paths", |
1046 | &bnc->prefix, bnc->ifindex, bnc->srte_color, | |
35aae5c9 | 1047 | bnc->bgp->name_pretty, |
df2a41a9 DS |
1048 | bgp_nexthop_dump_bnc_flags(bnc, bnc_buf, |
1049 | sizeof(bnc_buf)), | |
1050 | bgp_nexthop_dump_bnc_change_flags(bnc, chg_buf, | |
1051 | sizeof(bnc_buf))); | |
fb018d25 DS |
1052 | } |
1053 | ||
a2addae8 | 1054 | LIST_FOREACH (path, &(bnc->paths), nh_thread) { |
d62a17ae | 1055 | if (!(path->type == ZEBRA_ROUTE_BGP |
1056 | && ((path->sub_type == BGP_ROUTE_NORMAL) | |
960035b2 PZ |
1057 | || (path->sub_type == BGP_ROUTE_STATIC) |
1058 | || (path->sub_type == BGP_ROUTE_IMPORTED)))) | |
d62a17ae | 1059 | continue; |
1060 | ||
9bcb3eef DS |
1061 | dest = path->net; |
1062 | assert(dest && bgp_dest_table(dest)); | |
1063 | p = bgp_dest_get_prefix(dest); | |
b54892e0 | 1064 | afi = family2afi(p->family); |
9bcb3eef | 1065 | table = bgp_dest_table(dest); |
d62a17ae | 1066 | safi = table->safi; |
1067 | ||
960035b2 PZ |
1068 | /* |
1069 | * handle routes from other VRFs (they can have a | |
1070 | * nexthop in THIS VRF). bgp_path is the bgp instance | |
1071 | * that owns the route referencing this nexthop. | |
1072 | */ | |
1073 | bgp_path = table->bgp; | |
1074 | ||
1075 | /* | |
1076 | * Path becomes valid/invalid depending on whether the nexthop | |
d62a17ae | 1077 | * reachable/unreachable. |
960035b2 PZ |
1078 | * |
1079 | * In case of unicast routes that were imported from vpn | |
1080 | * and that have labels, they are valid only if there are | |
1081 | * nexthops with labels | |
a2299aba AD |
1082 | * |
1083 | * If the nexthop is EVPN gateway-IP, | |
1084 | * do not check for a valid label. | |
d62a17ae | 1085 | */ |
960035b2 | 1086 | |
34ea39b6 | 1087 | bool bnc_is_valid_nexthop = false; |
1088 | bool path_valid = false; | |
960035b2 | 1089 | |
021b6596 AD |
1090 | if (safi == SAFI_UNICAST && path->sub_type == BGP_ROUTE_IMPORTED |
1091 | && path->extra && path->extra->num_labels | |
1092 | && (path->attr->evpn_overlay.type | |
1093 | != OVERLAY_INDEX_GATEWAY_IP)) { | |
960035b2 | 1094 | bnc_is_valid_nexthop = |
1bb550b6 PG |
1095 | bgp_isvalid_nexthop_for_mpls(bnc, path) ? true |
1096 | : false; | |
960035b2 | 1097 | } else { |
e7cbe5e5 NT |
1098 | if (bgp_update_martian_nexthop( |
1099 | bnc->bgp, afi, safi, path->type, | |
9bcb3eef | 1100 | path->sub_type, path->attr, dest)) { |
e7cbe5e5 NT |
1101 | if (BGP_DEBUG(nht, NHT)) |
1102 | zlog_debug( | |
56ca3b5b | 1103 | "%s: prefix %pBD (vrf %s), ignoring path due to martian or self-next-hop", |
9bcb3eef | 1104 | __func__, dest, bgp_path->name); |
e7cbe5e5 NT |
1105 | } else |
1106 | bnc_is_valid_nexthop = | |
34ea39b6 | 1107 | bgp_isvalid_nexthop(bnc) ? true : false; |
960035b2 PZ |
1108 | } |
1109 | ||
9e15d76a | 1110 | if (BGP_DEBUG(nht, NHT)) { |
1111 | char buf1[RD_ADDRSTRLEN]; | |
960035b2 | 1112 | |
9bcb3eef DS |
1113 | if (dest->pdest) { |
1114 | prefix_rd2str((struct prefix_rd *)bgp_dest_get_prefix(dest->pdest), | |
9e15d76a | 1115 | buf1, sizeof(buf1)); |
1116 | zlog_debug( | |
56ca3b5b | 1117 | "... eval path %d/%d %pBD RD %s %s flags 0x%x", |
9bcb3eef | 1118 | afi, safi, dest, buf1, |
9e15d76a | 1119 | bgp_path->name_pretty, path->flags); |
1120 | } else | |
1121 | zlog_debug( | |
56ca3b5b | 1122 | "... eval path %d/%d %pBD %s flags 0x%x", |
9bcb3eef | 1123 | afi, safi, dest, bgp_path->name_pretty, |
9e15d76a | 1124 | path->flags); |
1125 | } | |
d62a17ae | 1126 | |
0139efe0 | 1127 | /* Skip paths marked for removal or as history. */ |
1128 | if (CHECK_FLAG(path->flags, BGP_PATH_REMOVED) | |
1129 | || CHECK_FLAG(path->flags, BGP_PATH_HISTORY)) | |
1130 | continue; | |
1131 | ||
d62a17ae | 1132 | /* Copy the metric to the path. Will be used for bestpath |
1133 | * computation */ | |
1134 | if (bgp_isvalid_nexthop(bnc) && bnc->metric) | |
18ee8310 DS |
1135 | (bgp_path_info_extra_get(path))->igpmetric = |
1136 | bnc->metric; | |
d62a17ae | 1137 | else if (path->extra) |
1138 | path->extra->igpmetric = 0; | |
1139 | ||
1140 | if (CHECK_FLAG(bnc->change_flags, BGP_NEXTHOP_METRIC_CHANGED) | |
545aeef1 RW |
1141 | || CHECK_FLAG(bnc->change_flags, BGP_NEXTHOP_CHANGED) |
1142 | || path->attr->srte_color != 0) | |
1defdda8 | 1143 | SET_FLAG(path->flags, BGP_PATH_IGP_CHANGED); |
d62a17ae | 1144 | |
d4980edf | 1145 | path_valid = CHECK_FLAG(path->flags, BGP_PATH_VALID); |
34ea39b6 | 1146 | if (path_valid != bnc_is_valid_nexthop) { |
1147 | if (path_valid) { | |
1148 | /* No longer valid, clear flag; also for EVPN | |
1149 | * routes, unimport from VRFs if needed. | |
1150 | */ | |
1151 | bgp_aggregate_decrement(bgp_path, p, path, afi, | |
1152 | safi); | |
9bcb3eef | 1153 | bgp_path_info_unset_flag(dest, path, |
34ea39b6 | 1154 | BGP_PATH_VALID); |
1155 | if (safi == SAFI_EVPN && | |
9bcb3eef | 1156 | bgp_evpn_is_prefix_nht_supported(bgp_dest_get_prefix(dest))) |
34ea39b6 | 1157 | bgp_evpn_unimport_route(bgp_path, |
9bcb3eef | 1158 | afi, safi, bgp_dest_get_prefix(dest), path); |
34ea39b6 | 1159 | } else { |
1160 | /* Path becomes valid, set flag; also for EVPN | |
1161 | * routes, import from VRFs if needed. | |
1162 | */ | |
9bcb3eef | 1163 | bgp_path_info_set_flag(dest, path, |
34ea39b6 | 1164 | BGP_PATH_VALID); |
1165 | bgp_aggregate_increment(bgp_path, p, path, afi, | |
1166 | safi); | |
1167 | if (safi == SAFI_EVPN && | |
9bcb3eef | 1168 | bgp_evpn_is_prefix_nht_supported(bgp_dest_get_prefix(dest))) |
34ea39b6 | 1169 | bgp_evpn_import_route(bgp_path, |
9bcb3eef | 1170 | afi, safi, bgp_dest_get_prefix(dest), path); |
34ea39b6 | 1171 | } |
7c312383 AD |
1172 | } |
1173 | ||
9bcb3eef | 1174 | bgp_process(bgp_path, dest, afi, safi); |
d62a17ae | 1175 | } |
fc9a856f | 1176 | |
1e91f1d1 DS |
1177 | if (peer) { |
1178 | int valid_nexthops = bgp_isvalid_nexthop(bnc); | |
1179 | ||
824065c4 DS |
1180 | if (valid_nexthops) { |
1181 | /* | |
1182 | * Peering cannot occur across a blackhole nexthop | |
1183 | */ | |
e817f2cc | 1184 | if (bnc->nexthop_num == 1 && bnc->nexthop |
824065c4 DS |
1185 | && bnc->nexthop->type == NEXTHOP_TYPE_BLACKHOLE) { |
1186 | peer->last_reset = PEER_DOWN_WAITING_NHT; | |
1187 | valid_nexthops = 0; | |
1188 | } else | |
1189 | peer->last_reset = PEER_DOWN_WAITING_OPEN; | |
1190 | } else | |
1e91f1d1 DS |
1191 | peer->last_reset = PEER_DOWN_WAITING_NHT; |
1192 | ||
1193 | if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED)) { | |
1194 | if (BGP_DEBUG(nht, NHT)) | |
15569c58 | 1195 | zlog_debug( |
8761cd6d | 1196 | "%s: Updating peer (%s(%s)) status with NHT nexthops %d", |
15569c58 | 1197 | __func__, peer->host, |
8761cd6d DS |
1198 | peer->bgp->name_pretty, |
1199 | !!valid_nexthops); | |
f8dcd38d | 1200 | bgp_fsm_nht_update(peer, !!valid_nexthops); |
1e91f1d1 DS |
1201 | SET_FLAG(bnc->flags, BGP_NEXTHOP_PEER_NOTIFIED); |
1202 | } | |
d62a17ae | 1203 | } |
fc9a856f | 1204 | |
d62a17ae | 1205 | RESET_FLAG(bnc->change_flags); |
fb018d25 DS |
1206 | } |
1207 | ||
1208 | /** | |
1209 | * path_nh_map - make or break path-to-nexthop association. | |
1210 | * ARGUMENTS: | |
1211 | * path - pointer to the path structure | |
1212 | * bnc - pointer to the nexthop structure | |
1213 | * make - if set, make the association. if unset, just break the existing | |
1214 | * association. | |
1215 | */ | |
7f040da1 DS |
1216 | void path_nh_map(struct bgp_path_info *path, struct bgp_nexthop_cache *bnc, |
1217 | bool make) | |
fb018d25 | 1218 | { |
d62a17ae | 1219 | if (path->nexthop) { |
1220 | LIST_REMOVE(path, nh_thread); | |
1221 | path->nexthop->path_count--; | |
1222 | path->nexthop = NULL; | |
1223 | } | |
1224 | if (make) { | |
1225 | LIST_INSERT_HEAD(&(bnc->paths), path, nh_thread); | |
1226 | path->nexthop = bnc; | |
1227 | path->nexthop->path_count++; | |
1228 | } | |
fb018d25 | 1229 | } |
1ee0a2df DS |
1230 | |
1231 | /* | |
1232 | * This function is called to register nexthops to zebra | |
1233 | * as that we may have tried to install the nexthops | |
1234 | * before we actually have a zebra connection | |
1235 | */ | |
1236 | void bgp_nht_register_nexthops(struct bgp *bgp) | |
1237 | { | |
f663c581 RW |
1238 | for (afi_t afi = AFI_IP; afi < AFI_MAX; afi++) { |
1239 | struct bgp_nexthop_cache *bnc; | |
1ee0a2df | 1240 | |
f663c581 RW |
1241 | frr_each (bgp_nexthop_cache, &bgp->nexthop_cache_table[afi], |
1242 | bnc) { | |
23f60ffd | 1243 | register_zebra_rnh(bnc); |
1ee0a2df DS |
1244 | } |
1245 | } | |
1246 | } | |
1ea03b90 | 1247 | |
b3a3290e | 1248 | void bgp_nht_reg_enhe_cap_intfs(struct peer *peer) |
1ea03b90 DS |
1249 | { |
1250 | struct bgp *bgp; | |
1ea03b90 DS |
1251 | struct bgp_nexthop_cache *bnc; |
1252 | struct nexthop *nhop; | |
1253 | struct interface *ifp; | |
1254 | struct prefix p; | |
35aae5c9 | 1255 | ifindex_t ifindex = 0; |
1ea03b90 DS |
1256 | |
1257 | if (peer->ifp) | |
1258 | return; | |
1259 | ||
1260 | bgp = peer->bgp; | |
1ea03b90 | 1261 | if (!sockunion2hostprefix(&peer->su, &p)) { |
b3a3290e DS |
1262 | zlog_warn("%s: Unable to convert sockunion to prefix for %s", |
1263 | __func__, peer->host); | |
1ea03b90 DS |
1264 | return; |
1265 | } | |
1266 | ||
1267 | if (p.family != AF_INET6) | |
1268 | return; | |
35aae5c9 DS |
1269 | /* |
1270 | * Gather the ifindex for if up/down events to be | |
1271 | * tagged into this fun | |
1272 | */ | |
1273 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
1274 | ifindex = peer->su.sin6.sin6_scope_id; | |
1ea03b90 | 1275 | |
35aae5c9 | 1276 | bnc = bnc_find(&bgp->nexthop_cache_table[AFI_IP6], &p, 0, ifindex); |
1ea03b90 DS |
1277 | if (!bnc) |
1278 | return; | |
1279 | ||
1280 | if (peer != bnc->nht_info) | |
1281 | return; | |
1282 | ||
1283 | for (nhop = bnc->nexthop; nhop; nhop = nhop->next) { | |
8c9769e0 DS |
1284 | ifp = if_lookup_by_index(nhop->ifindex, nhop->vrf_id); |
1285 | ||
1286 | if (!ifp) | |
1287 | continue; | |
1288 | ||
1ea03b90 DS |
1289 | zclient_send_interface_radv_req(zclient, |
1290 | nhop->vrf_id, | |
1291 | ifp, true, | |
1292 | BGP_UNNUM_DEFAULT_RA_INTERVAL); | |
1293 | } | |
1294 | } | |
b3a3290e DS |
1295 | |
1296 | void bgp_nht_dereg_enhe_cap_intfs(struct peer *peer) | |
1297 | { | |
1298 | struct bgp *bgp; | |
b3a3290e DS |
1299 | struct bgp_nexthop_cache *bnc; |
1300 | struct nexthop *nhop; | |
1301 | struct interface *ifp; | |
1302 | struct prefix p; | |
35aae5c9 | 1303 | ifindex_t ifindex = 0; |
b3a3290e DS |
1304 | |
1305 | if (peer->ifp) | |
1306 | return; | |
1307 | ||
1308 | bgp = peer->bgp; | |
1309 | ||
b3a3290e DS |
1310 | if (!sockunion2hostprefix(&peer->su, &p)) { |
1311 | zlog_warn("%s: Unable to convert sockunion to prefix for %s", | |
1312 | __func__, peer->host); | |
1313 | return; | |
1314 | } | |
1315 | ||
1316 | if (p.family != AF_INET6) | |
1317 | return; | |
35aae5c9 DS |
1318 | /* |
1319 | * Gather the ifindex for if up/down events to be | |
1320 | * tagged into this fun | |
1321 | */ | |
1322 | if (peer->conf_if && IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) | |
1323 | ifindex = peer->su.sin6.sin6_scope_id; | |
b3a3290e | 1324 | |
35aae5c9 | 1325 | bnc = bnc_find(&bgp->nexthop_cache_table[AFI_IP6], &p, 0, ifindex); |
b3a3290e DS |
1326 | if (!bnc) |
1327 | return; | |
1328 | ||
1329 | if (peer != bnc->nht_info) | |
1330 | return; | |
1331 | ||
1332 | for (nhop = bnc->nexthop; nhop; nhop = nhop->next) { | |
1333 | ifp = if_lookup_by_index(nhop->ifindex, nhop->vrf_id); | |
1334 | ||
68cecc3b DS |
1335 | if (!ifp) |
1336 | continue; | |
1337 | ||
b3a3290e DS |
1338 | zclient_send_interface_radv_req(zclient, nhop->vrf_id, ifp, 0, |
1339 | 0); | |
1340 | } | |
1341 | } | |
c589d847 AK |
1342 | |
1343 | /**************************************************************************** | |
1344 | * L3 NHGs are used for fast failover of nexthops in the dplane. These are | |
1345 | * the APIs for allocating L3 NHG ids. Management of the L3 NHG itself is | |
1346 | * left to the application using it. | |
1347 | * PS: Currently EVPN host routes is the only app using L3 NHG for fast | |
1348 | * failover of remote ES links. | |
1349 | ***************************************************************************/ | |
1350 | static bitfield_t bgp_nh_id_bitmap; | |
8bcb09a1 | 1351 | static uint32_t bgp_l3nhg_start; |
c589d847 | 1352 | |
8bcb09a1 AK |
1353 | /* XXX - currently we do nothing on the callbacks */ |
1354 | static void bgp_l3nhg_add_cb(const char *name) | |
1355 | { | |
1356 | } | |
1357 | static void bgp_l3nhg_add_nexthop_cb(const struct nexthop_group_cmd *nhgc, | |
1358 | const struct nexthop *nhop) | |
1359 | { | |
1360 | } | |
1361 | static void bgp_l3nhg_del_nexthop_cb(const struct nexthop_group_cmd *nhgc, | |
1362 | const struct nexthop *nhop) | |
1363 | { | |
1364 | } | |
1365 | static void bgp_l3nhg_del_cb(const char *name) | |
c589d847 | 1366 | { |
c589d847 AK |
1367 | } |
1368 | ||
8bcb09a1 | 1369 | static void bgp_l3nhg_zebra_init(void) |
c589d847 | 1370 | { |
8bcb09a1 AK |
1371 | static bool bgp_l3nhg_zebra_inited; |
1372 | if (bgp_l3nhg_zebra_inited) | |
c589d847 AK |
1373 | return; |
1374 | ||
8bcb09a1 AK |
1375 | bgp_l3nhg_zebra_inited = true; |
1376 | bgp_l3nhg_start = zclient_get_nhg_start(ZEBRA_ROUTE_BGP); | |
1377 | nexthop_group_init(bgp_l3nhg_add_cb, bgp_l3nhg_add_nexthop_cb, | |
1378 | bgp_l3nhg_del_nexthop_cb, bgp_l3nhg_del_cb); | |
c589d847 AK |
1379 | } |
1380 | ||
8bcb09a1 | 1381 | |
c589d847 AK |
1382 | void bgp_l3nhg_init(void) |
1383 | { | |
8bcb09a1 AK |
1384 | uint32_t id_max; |
1385 | ||
7a8ce9d5 | 1386 | id_max = MIN(ZEBRA_NHG_PROTO_SPACING - 1, 16 * 1024); |
8bcb09a1 | 1387 | bf_init(bgp_nh_id_bitmap, id_max); |
c589d847 | 1388 | bf_assign_zero_index(bgp_nh_id_bitmap); |
8bcb09a1 AK |
1389 | |
1390 | if (BGP_DEBUG(nht, NHT) || BGP_DEBUG(evpn_mh, EVPN_MH_ES)) | |
1391 | zlog_debug("bgp l3_nhg range %u - %u", bgp_l3nhg_start + 1, | |
1392 | bgp_l3nhg_start + id_max); | |
c589d847 AK |
1393 | } |
1394 | ||
1395 | void bgp_l3nhg_finish(void) | |
1396 | { | |
1397 | bf_free(bgp_nh_id_bitmap); | |
1398 | } | |
8bcb09a1 AK |
1399 | |
1400 | uint32_t bgp_l3nhg_id_alloc(void) | |
1401 | { | |
1402 | uint32_t nhg_id = 0; | |
1403 | ||
1404 | bgp_l3nhg_zebra_init(); | |
1405 | bf_assign_index(bgp_nh_id_bitmap, nhg_id); | |
1406 | if (nhg_id) | |
1407 | nhg_id += bgp_l3nhg_start; | |
1408 | ||
1409 | return nhg_id; | |
1410 | } | |
1411 | ||
1412 | void bgp_l3nhg_id_free(uint32_t nhg_id) | |
1413 | { | |
1414 | if (!nhg_id || (nhg_id <= bgp_l3nhg_start)) | |
1415 | return; | |
1416 | ||
1417 | nhg_id -= bgp_l3nhg_start; | |
1418 | ||
1419 | bf_release_index(bgp_nh_id_bitmap, nhg_id); | |
1420 | } |