1 /* NHRP routing functions
2 * Copyright (c) 2014-2015 Timo Teräs
4 * This file is free software: you may copy, redistribute and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
21 DEFINE_MTYPE_STATIC(NHRPD
, NHRP_ROUTE
, "NHRP routing entry");
23 static struct zclient
*zclient
;
24 static struct route_table
*zebra_rib
[AFI_MAX
];
28 struct interface
*ifp
;
29 struct interface
*nhrp_ifp
;
32 static struct route_node
*nhrp_route_update_get(const struct prefix
*p
,
35 struct route_node
*rn
;
36 afi_t afi
= family2afi(PREFIX_FAMILY(p
));
42 rn
= route_node_get(zebra_rib
[afi
], p
);
44 rn
->info
= XCALLOC(MTYPE_NHRP_ROUTE
,
45 sizeof(struct route_info
));
50 return route_node_lookup(zebra_rib
[afi
], p
);
54 static void nhrp_route_update_put(struct route_node
*rn
)
56 struct route_info
*ri
= rn
->info
;
58 if (!ri
->ifp
&& !ri
->nhrp_ifp
59 && sockunion_is_null(&ri
->via
)) {
60 XFREE(MTYPE_NHRP_ROUTE
, rn
->info
);
61 route_unlock_node(rn
);
63 route_unlock_node(rn
);
66 static void nhrp_route_update_zebra(const struct prefix
*p
,
67 union sockunion
*nexthop
,
68 struct interface
*ifp
)
70 struct route_node
*rn
;
71 struct route_info
*ri
;
73 rn
= nhrp_route_update_get(p
, !sockunion_is_null(nexthop
) || ifp
);
78 nhrp_route_update_put(rn
);
82 static void nhrp_zebra_register_neigh(vrf_id_t vrf_id
, afi_t afi
, bool reg
)
86 if (!zclient
|| zclient
->sock
< 0)
92 zclient_create_header(s
, reg
? ZEBRA_NHRP_NEIGH_REGISTER
:
93 ZEBRA_NHRP_NEIGH_UNREGISTER
,
96 stream_putw_at(s
, 0, stream_get_endp(s
));
97 zclient_send_message(zclient
);
100 void nhrp_route_update_nhrp(const struct prefix
*p
, struct interface
*ifp
)
102 struct route_node
*rn
;
103 struct route_info
*ri
;
105 rn
= nhrp_route_update_get(p
, ifp
!= NULL
);
109 nhrp_route_update_put(rn
);
113 void nhrp_route_announce(int add
, enum nhrp_cache_type type
,
114 const struct prefix
*p
, struct interface
*ifp
,
115 const union sockunion
*nexthop
, uint32_t mtu
)
117 struct zapi_route api
;
118 struct zapi_nexthop
*api_nh
;
119 union sockunion
*nexthop_ref
= (union sockunion
*)nexthop
;
121 if (zclient
->sock
< 0)
124 memset(&api
, 0, sizeof(api
));
125 api
.type
= ZEBRA_ROUTE_NHRP
;
126 api
.safi
= SAFI_UNICAST
;
127 api
.vrf_id
= VRF_DEFAULT
;
131 case NHRP_CACHE_NEGATIVE
:
132 zapi_route_set_blackhole(&api
, BLACKHOLE_REJECT
);
136 case NHRP_CACHE_DYNAMIC
:
138 case NHRP_CACHE_STATIC
:
139 /* Regular route, so these are announced
140 * to other routing daemons */
143 SET_FLAG(api
.flags
, ZEBRA_FLAG_FIB_OVERRIDE
);
146 SET_FLAG(api
.flags
, ZEBRA_FLAG_ALLOW_RECURSION
);
148 SET_FLAG(api
.message
, ZAPI_MESSAGE_NEXTHOP
);
150 api_nh
= &api
.nexthops
[0];
151 api_nh
->vrf_id
= VRF_DEFAULT
;
153 switch (api
.prefix
.family
) {
155 if (api
.prefix
.prefixlen
== IPV4_MAX_BITLEN
&&
157 memcmp(&nexthop_ref
->sin
.sin_addr
, &api
.prefix
.u
.prefix4
,
158 sizeof(struct in_addr
)) == 0) {
162 api_nh
->gate
.ipv4
= nexthop_ref
->sin
.sin_addr
;
163 api_nh
->type
= NEXTHOP_TYPE_IPV4
;
166 api_nh
->ifindex
= ifp
->ifindex
;
167 if (api_nh
->type
== NEXTHOP_TYPE_IPV4
)
168 api_nh
->type
= NEXTHOP_TYPE_IPV4_IFINDEX
;
170 api_nh
->type
= NEXTHOP_TYPE_IFINDEX
;
174 if (api
.prefix
.prefixlen
== IPV6_MAX_BITLEN
&&
176 memcmp(&nexthop_ref
->sin6
.sin6_addr
, &api
.prefix
.u
.prefix6
,
177 sizeof(struct in6_addr
)) == 0) {
181 api_nh
->gate
.ipv6
= nexthop_ref
->sin6
.sin6_addr
;
182 api_nh
->type
= NEXTHOP_TYPE_IPV6
;
185 api_nh
->ifindex
= ifp
->ifindex
;
186 if (api_nh
->type
== NEXTHOP_TYPE_IPV6
)
187 api_nh
->type
= NEXTHOP_TYPE_IPV6_IFINDEX
;
189 api_nh
->type
= NEXTHOP_TYPE_IFINDEX
;
194 SET_FLAG(api
.message
, ZAPI_MESSAGE_MTU
);
198 if (unlikely(debug_flags
& NHRP_DEBUG_ROUTE
)) {
199 char buf
[PREFIX_STRLEN
];
202 "Zebra send: route %s %pFX nexthop %s metric %u count %d dev %s",
203 add
? "add" : "del", &api
.prefix
,
204 nexthop_ref
? inet_ntop(api
.prefix
.family
,
208 api
.metric
, api
.nexthop_num
, ifp
? ifp
->name
: "none");
211 zclient_route_send(add
? ZEBRA_ROUTE_ADD
: ZEBRA_ROUTE_DELETE
, zclient
,
215 int nhrp_route_read(ZAPI_CALLBACK_ARGS
)
217 struct zapi_route api
;
218 struct zapi_nexthop
*api_nh
;
219 struct interface
*ifp
= NULL
;
220 union sockunion nexthop_addr
;
223 if (zapi_route_decode(zclient
->ibuf
, &api
) < 0)
226 /* we completely ignore srcdest routes for now. */
227 if (CHECK_FLAG(api
.message
, ZAPI_MESSAGE_SRCPFX
))
230 /* ignore our routes */
231 if (api
.type
== ZEBRA_ROUTE_NHRP
)
234 sockunion_family(&nexthop_addr
) = AF_UNSPEC
;
235 if (CHECK_FLAG(api
.message
, ZAPI_MESSAGE_NEXTHOP
)) {
236 api_nh
= &api
.nexthops
[0];
238 nexthop_addr
.sa
.sa_family
= api
.prefix
.family
;
239 switch (nexthop_addr
.sa
.sa_family
) {
241 nexthop_addr
.sin
.sin_addr
= api_nh
->gate
.ipv4
;
244 nexthop_addr
.sin6
.sin6_addr
= api_nh
->gate
.ipv6
;
248 if (api_nh
->ifindex
!= IFINDEX_INTERNAL
)
249 ifp
= if_lookup_by_index(api_nh
->ifindex
, VRF_DEFAULT
);
252 added
= (cmd
== ZEBRA_REDISTRIBUTE_ROUTE_ADD
);
253 debugf(NHRP_DEBUG_ROUTE
, "if-route-%s: %pFX via %pSU dev %s",
254 added
? "add" : "del", &api
.prefix
, &nexthop_addr
,
255 ifp
? ifp
->name
: "(none)");
257 nhrp_route_update_zebra(&api
.prefix
, &nexthop_addr
, added
? ifp
: NULL
);
258 nhrp_shortcut_prefix_change(&api
.prefix
, !added
);
263 int nhrp_route_get_nexthop(const union sockunion
*addr
, struct prefix
*p
,
264 union sockunion
*via
, struct interface
**ifp
)
266 struct route_node
*rn
;
267 struct route_info
*ri
;
268 struct prefix lookup
;
269 afi_t afi
= family2afi(sockunion_family(addr
));
271 sockunion2hostprefix(addr
, &lookup
);
273 rn
= route_node_match(zebra_rib
[afi
], &lookup
);
279 debugf(NHRP_DEBUG_ROUTE
, "lookup %pFX: nhrp_if=%s", &lookup
,
283 sockunion_family(via
) = AF_UNSPEC
;
287 debugf(NHRP_DEBUG_ROUTE
, "lookup %pFX: zebra route dev %s",
288 &lookup
, ri
->ifp
? ri
->ifp
->name
: "(none)");
297 route_unlock_node(rn
);
301 enum nhrp_route_type
nhrp_route_address(struct interface
*in_ifp
,
302 union sockunion
*addr
, struct prefix
*p
,
303 struct nhrp_peer
**peer
)
305 struct interface
*ifp
= in_ifp
;
306 struct nhrp_interface
*nifp
;
307 struct nhrp_cache
*c
;
308 union sockunion via
[4];
309 uint32_t network_id
= 0;
310 afi_t afi
= family2afi(sockunion_family(addr
));
315 network_id
= nifp
->afi
[afi
].network_id
;
317 c
= nhrp_cache_get(ifp
, addr
, 0);
318 if (c
&& c
->cur
.type
== NHRP_CACHE_LOCAL
) {
320 memset(p
, 0, sizeof(*p
));
321 return NHRP_ROUTE_LOCAL
;
325 for (i
= 0; i
< 4; i
++) {
326 if (!nhrp_route_get_nexthop(addr
, p
, &via
[i
], &ifp
))
327 return NHRP_ROUTE_BLACKHOLE
;
329 /* Departing from nbma network? */
332 && network_id
!= nifp
->afi
[afi
].network_id
)
333 return NHRP_ROUTE_OFF_NBMA
;
335 if (sockunion_family(&via
[i
]) == AF_UNSPEC
)
337 /* Resolve via node, but return the prefix of first match */
343 c
= nhrp_cache_get(ifp
, addr
, 0);
344 if (c
&& c
->cur
.type
>= NHRP_CACHE_DYNAMIC
) {
346 memset(p
, 0, sizeof(*p
));
347 if (c
->cur
.type
== NHRP_CACHE_LOCAL
)
348 return NHRP_ROUTE_LOCAL
;
350 *peer
= nhrp_peer_ref(c
->cur
.peer
);
351 return NHRP_ROUTE_NBMA_NEXTHOP
;
355 return NHRP_ROUTE_BLACKHOLE
;
358 static void nhrp_zebra_connected(struct zclient
*zclient
)
360 zclient_send_reg_requests(zclient
, VRF_DEFAULT
);
361 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD
, zclient
, AFI_IP
,
362 ZEBRA_ROUTE_ALL
, 0, VRF_DEFAULT
);
363 zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD
, zclient
, AFI_IP6
,
364 ZEBRA_ROUTE_ALL
, 0, VRF_DEFAULT
);
365 nhrp_zebra_register_neigh(VRF_DEFAULT
, AFI_IP
, true);
366 nhrp_zebra_register_neigh(VRF_DEFAULT
, AFI_IP6
, true);
369 void nhrp_zebra_init(void)
371 zebra_rib
[AFI_IP
] = route_table_init();
372 zebra_rib
[AFI_IP6
] = route_table_init();
374 zclient
= zclient_new(master
, &zclient_options_default
);
375 zclient
->zebra_connected
= nhrp_zebra_connected
;
376 zclient
->interface_address_add
= nhrp_interface_address_add
;
377 zclient
->interface_address_delete
= nhrp_interface_address_delete
;
378 zclient
->redistribute_route_add
= nhrp_route_read
;
379 zclient
->redistribute_route_del
= nhrp_route_read
;
380 zclient
->neighbor_added
= nhrp_neighbor_operation
;
381 zclient
->neighbor_removed
= nhrp_neighbor_operation
;
382 zclient
->neighbor_get
= nhrp_neighbor_operation
;
383 zclient
->gre_update
= nhrp_gre_update
;
384 zclient_init(zclient
, ZEBRA_ROUTE_NHRP
, 0, &nhrpd_privs
);
387 static void nhrp_table_node_cleanup(struct route_table
*table
,
388 struct route_node
*node
)
393 XFREE(MTYPE_NHRP_ROUTE
, node
->info
);
396 void nhrp_send_zebra_configure_arp(struct interface
*ifp
, int family
)
400 if (!zclient
|| zclient
->sock
< 0) {
401 debugf(NHRP_DEBUG_COMMON
, "%s() : zclient not ready",
407 zclient_create_header(s
,
410 stream_putc(s
, family
);
411 stream_putl(s
, ifp
->ifindex
);
412 stream_putw_at(s
, 0, stream_get_endp(s
));
413 zclient_send_message(zclient
);
416 void nhrp_send_zebra_gre_source_set(struct interface
*ifp
,
417 unsigned int link_idx
,
418 vrf_id_t link_vrf_id
)
422 if (!zclient
|| zclient
->sock
< 0) {
423 zlog_err("%s : zclient not ready", __func__
);
426 if (link_idx
== IFINDEX_INTERNAL
|| link_vrf_id
== VRF_UNKNOWN
) {
427 /* silently ignore */
432 zclient_create_header(s
,
433 ZEBRA_GRE_SOURCE_SET
,
435 stream_putl(s
, ifp
->ifindex
);
436 stream_putl(s
, link_idx
);
437 stream_putl(s
, link_vrf_id
);
438 stream_putl(s
, 0); /* mtu provisioning */
439 stream_putw_at(s
, 0, stream_get_endp(s
));
440 zclient_send_message(zclient
);
443 void nhrp_send_zebra_nbr(union sockunion
*in
,
444 union sockunion
*out
,
445 struct interface
*ifp
)
449 if (!zclient
|| zclient
->sock
< 0)
453 zclient_neigh_ip_encode(s
, out
? ZEBRA_NEIGH_IP_ADD
:
454 ZEBRA_NEIGH_IP_DEL
, in
, out
,
456 stream_putw_at(s
, 0, stream_get_endp(s
));
457 zclient_send_message(zclient
);
460 int nhrp_send_zebra_gre_request(struct interface
*ifp
)
462 return zclient_send_zebra_gre_request(zclient
, ifp
);
465 void nhrp_zebra_terminate(void)
467 nhrp_zebra_register_neigh(VRF_DEFAULT
, AFI_IP
, false);
468 nhrp_zebra_register_neigh(VRF_DEFAULT
, AFI_IP6
, false);
469 zclient_stop(zclient
);
470 zclient_free(zclient
);
472 zebra_rib
[AFI_IP
]->cleanup
= nhrp_table_node_cleanup
;
473 zebra_rib
[AFI_IP6
]->cleanup
= nhrp_table_node_cleanup
;
474 route_table_finish(zebra_rib
[AFI_IP
]);
475 route_table_finish(zebra_rib
[AFI_IP6
]);
478 void nhrp_gre_update(ZAPI_CALLBACK_ARGS
)
481 struct nhrp_gre_info gre_info
, *val
;
482 struct interface
*ifp
;
486 if (vrf_id
!= VRF_DEFAULT
)
489 /* read GRE information */
490 STREAM_GETL(s
, gre_info
.ifindex
);
491 STREAM_GETL(s
, gre_info
.ikey
);
492 STREAM_GETL(s
, gre_info
.okey
);
493 STREAM_GETL(s
, gre_info
.ifindex_link
);
494 STREAM_GETL(s
, gre_info
.vrfid_link
);
495 STREAM_GETL(s
, gre_info
.vtep_ip
.s_addr
);
496 STREAM_GETL(s
, gre_info
.vtep_ip_remote
.s_addr
);
497 if (gre_info
.ifindex
== IFINDEX_INTERNAL
)
500 val
= hash_lookup(nhrp_gre_list
, &gre_info
);
502 if (gre_info
.vtep_ip
.s_addr
!= val
->vtep_ip
.s_addr
||
503 gre_info
.vrfid_link
!= val
->vrfid_link
||
504 gre_info
.ifindex_link
!= val
->ifindex_link
||
505 gre_info
.ikey
!= val
->ikey
||
506 gre_info
.okey
!= val
->okey
) {
508 memcpy(val
, &gre_info
, sizeof(struct nhrp_gre_info
));
511 val
= nhrp_gre_info_alloc(&gre_info
);
513 ifp
= if_lookup_by_index(gre_info
.ifindex
, vrf_id
);
514 debugf(NHRP_DEBUG_EVENT
, "%s: gre interface %d vr %d obtained from system",
515 ifp
? ifp
->name
: "<none>", gre_info
.ifindex
, vrf_id
);
517 nhrp_interface_update_nbma(ifp
, val
);
520 zlog_err("%s(): error reading response ..", __func__
);