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2fb975da TT |
1 | /* NHRP routing functions |
2 | * Copyright (c) 2014-2015 Timo Teräs | |
3 | * | |
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. | |
8 | */ | |
9 | ||
b45ac5f5 DL |
10 | #ifdef HAVE_CONFIG_H |
11 | #include "config.h" | |
12 | #endif | |
13 | ||
2fb975da TT |
14 | #include "nhrpd.h" |
15 | #include "table.h" | |
16 | #include "memory.h" | |
17 | #include "stream.h" | |
18 | #include "log.h" | |
19 | #include "zclient.h" | |
20 | ||
819dc8bb DL |
21 | DEFINE_MTYPE_STATIC(NHRPD, NHRP_ROUTE, "NHRP routing entry") |
22 | ||
2fb975da TT |
23 | static struct zclient *zclient; |
24 | static struct route_table *zebra_rib[AFI_MAX]; | |
25 | ||
26 | struct route_info { | |
27 | union sockunion via; | |
28 | struct interface *ifp; | |
29 | struct interface *nhrp_ifp; | |
30 | }; | |
31 | ||
996c9314 LB |
32 | static struct route_node *nhrp_route_update_get(const struct prefix *p, |
33 | int create) | |
2fb975da TT |
34 | { |
35 | struct route_node *rn; | |
36 | afi_t afi = family2afi(PREFIX_FAMILY(p)); | |
37 | ||
38 | if (!zebra_rib[afi]) | |
39 | return NULL; | |
40 | ||
41 | if (create) { | |
42 | rn = route_node_get(zebra_rib[afi], p); | |
43 | if (!rn->info) { | |
996c9314 LB |
44 | rn->info = XCALLOC(MTYPE_NHRP_ROUTE, |
45 | sizeof(struct route_info)); | |
2fb975da TT |
46 | route_lock_node(rn); |
47 | } | |
48 | return rn; | |
49 | } else { | |
50 | return route_node_lookup(zebra_rib[afi], p); | |
51 | } | |
52 | } | |
53 | ||
54 | static void nhrp_route_update_put(struct route_node *rn) | |
55 | { | |
56 | struct route_info *ri = rn->info; | |
57 | ||
996c9314 LB |
58 | if (!ri->ifp && !ri->nhrp_ifp |
59 | && sockunion_family(&ri->via) == AF_UNSPEC) { | |
2fb975da | 60 | XFREE(MTYPE_NHRP_ROUTE, rn->info); |
2fb975da TT |
61 | route_unlock_node(rn); |
62 | } | |
63 | route_unlock_node(rn); | |
64 | } | |
65 | ||
996c9314 LB |
66 | static void nhrp_route_update_zebra(const struct prefix *p, |
67 | union sockunion *nexthop, | |
68 | struct interface *ifp) | |
2fb975da TT |
69 | { |
70 | struct route_node *rn; | |
71 | struct route_info *ri; | |
72 | ||
996c9314 LB |
73 | rn = nhrp_route_update_get( |
74 | p, (sockunion_family(nexthop) != AF_UNSPEC) || ifp); | |
2fb975da TT |
75 | if (rn) { |
76 | ri = rn->info; | |
77 | ri->via = *nexthop; | |
78 | ri->ifp = ifp; | |
79 | nhrp_route_update_put(rn); | |
80 | } | |
81 | } | |
82 | ||
83 | void nhrp_route_update_nhrp(const struct prefix *p, struct interface *ifp) | |
84 | { | |
85 | struct route_node *rn; | |
86 | struct route_info *ri; | |
87 | ||
88 | rn = nhrp_route_update_get(p, ifp != NULL); | |
89 | if (rn) { | |
90 | ri = rn->info; | |
91 | ri->nhrp_ifp = ifp; | |
92 | nhrp_route_update_put(rn); | |
93 | } | |
94 | } | |
95 | ||
996c9314 LB |
96 | void nhrp_route_announce(int add, enum nhrp_cache_type type, |
97 | const struct prefix *p, struct interface *ifp, | |
98 | const union sockunion *nexthop, uint32_t mtu) | |
2fb975da | 99 | { |
9350687d RW |
100 | struct zapi_route api; |
101 | struct zapi_nexthop *api_nh; | |
2fb975da TT |
102 | |
103 | if (zclient->sock < 0) | |
104 | return; | |
105 | ||
9350687d RW |
106 | memset(&api, 0, sizeof(api)); |
107 | api.type = ZEBRA_ROUTE_NHRP; | |
108 | api.safi = SAFI_UNICAST; | |
d5b2119c | 109 | api.vrf_id = VRF_DEFAULT; |
9350687d RW |
110 | api.prefix = *p; |
111 | ||
2fb975da TT |
112 | switch (type) { |
113 | case NHRP_CACHE_NEGATIVE: | |
09a484dd DL |
114 | zapi_route_set_blackhole(&api, BLACKHOLE_REJECT); |
115 | ifp = NULL; | |
116 | nexthop = NULL; | |
2fb975da TT |
117 | break; |
118 | case NHRP_CACHE_DYNAMIC: | |
119 | case NHRP_CACHE_NHS: | |
120 | case NHRP_CACHE_STATIC: | |
121 | /* Regular route, so these are announced | |
122 | * to other routing daemons */ | |
123 | break; | |
124 | default: | |
9350687d | 125 | SET_FLAG(api.flags, ZEBRA_FLAG_FIB_OVERRIDE); |
2fb975da TT |
126 | break; |
127 | } | |
4e8b02f4 | 128 | SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION); |
2fb975da | 129 | |
9350687d RW |
130 | SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); |
131 | api.nexthop_num = 1; | |
132 | api_nh = &api.nexthops[0]; | |
4a7371e9 | 133 | api_nh->vrf_id = VRF_DEFAULT; |
2fb975da | 134 | |
9350687d RW |
135 | switch (api.prefix.family) { |
136 | case AF_INET: | |
2fb975da | 137 | if (nexthop) { |
6f27a9f6 RW |
138 | api_nh->gate.ipv4 = nexthop->sin.sin_addr; |
139 | api_nh->type = NEXTHOP_TYPE_IPV4; | |
2fb975da TT |
140 | } |
141 | if (ifp) { | |
6f27a9f6 RW |
142 | api_nh->ifindex = ifp->ifindex; |
143 | if (api_nh->type == NEXTHOP_TYPE_IPV4) | |
144 | api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX; | |
145 | else | |
146 | api_nh->type = NEXTHOP_TYPE_IFINDEX; | |
2fb975da | 147 | } |
9350687d RW |
148 | break; |
149 | case AF_INET6: | |
37dc8ab5 | 150 | if (nexthop) { |
6f27a9f6 RW |
151 | api_nh->gate.ipv6 = nexthop->sin6.sin6_addr; |
152 | api_nh->type = NEXTHOP_TYPE_IPV6; | |
37dc8ab5 TT |
153 | } |
154 | if (ifp) { | |
6f27a9f6 RW |
155 | api_nh->ifindex = ifp->ifindex; |
156 | if (api_nh->type == NEXTHOP_TYPE_IPV6) | |
157 | api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX; | |
158 | else | |
159 | api_nh->type = NEXTHOP_TYPE_IFINDEX; | |
37dc8ab5 | 160 | } |
9350687d RW |
161 | break; |
162 | } | |
163 | if (mtu) { | |
164 | SET_FLAG(api.message, ZAPI_MESSAGE_MTU); | |
165 | api.mtu = mtu; | |
166 | } | |
37dc8ab5 | 167 | |
9350687d RW |
168 | if (unlikely(debug_flags & NHRP_DEBUG_ROUTE)) { |
169 | char buf[2][PREFIX_STRLEN]; | |
37dc8ab5 | 170 | |
9350687d | 171 | prefix2str(&api.prefix, buf[0], sizeof(buf[0])); |
996c9314 LB |
172 | zlog_debug( |
173 | "Zebra send: route %s %s nexthop %s metric %u" | |
9350687d RW |
174 | " count %d dev %s", |
175 | add ? "add" : "del", buf[0], | |
996c9314 LB |
176 | nexthop ? inet_ntop(api.prefix.family, &api_nh->gate, |
177 | buf[1], sizeof(buf[1])) | |
178 | : "<onlink>", | |
09a484dd | 179 | api.metric, api.nexthop_num, ifp ? ifp->name : "none"); |
2fb975da | 180 | } |
9350687d RW |
181 | |
182 | zclient_route_send(add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE, zclient, | |
183 | &api); | |
2fb975da TT |
184 | } |
185 | ||
121f9dee | 186 | int nhrp_route_read(ZAPI_CALLBACK_ARGS) |
2fb975da | 187 | { |
74489921 RW |
188 | struct zapi_route api; |
189 | struct zapi_nexthop *api_nh; | |
2fb975da | 190 | struct interface *ifp = NULL; |
2fb975da | 191 | union sockunion nexthop_addr; |
2fb975da | 192 | char buf[2][PREFIX_STRLEN]; |
74489921 | 193 | int added; |
2fb975da | 194 | |
74489921 | 195 | if (zapi_route_decode(zclient->ibuf, &api) < 0) |
2fb975da | 196 | return -1; |
74489921 RW |
197 | |
198 | /* we completely ignore srcdest routes for now. */ | |
199 | if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX)) | |
c125d1d4 RW |
200 | return 0; |
201 | ||
74489921 RW |
202 | sockunion_family(&nexthop_addr) = AF_UNSPEC; |
203 | if (CHECK_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP)) { | |
204 | api_nh = &api.nexthops[0]; | |
205 | ||
206 | nexthop_addr.sa.sa_family = api.prefix.family; | |
207 | switch (nexthop_addr.sa.sa_family) { | |
208 | case AF_INET: | |
209 | nexthop_addr.sin.sin_addr = api_nh->gate.ipv4; | |
210 | break; | |
211 | case AF_INET6: | |
212 | nexthop_addr.sin6.sin6_addr = api_nh->gate.ipv6; | |
213 | break; | |
2fb975da | 214 | } |
74489921 RW |
215 | |
216 | if (api_nh->ifindex != IFINDEX_INTERNAL) | |
996c9314 | 217 | ifp = if_lookup_by_index(api_nh->ifindex, VRF_DEFAULT); |
2fb975da | 218 | } |
2fb975da | 219 | |
74489921 | 220 | added = (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD); |
2fb975da | 221 | debugf(NHRP_DEBUG_ROUTE, "if-route-%s: %s via %s dev %s", |
996c9314 | 222 | added ? "add" : "del", |
0d6f7fd6 DA |
223 | prefix2str(&api.prefix, buf[0], sizeof(buf[0])), |
224 | sockunion2str(&nexthop_addr, buf[1], sizeof(buf[1])), | |
996c9314 | 225 | ifp ? ifp->name : "(none)"); |
2fb975da | 226 | |
74489921 RW |
227 | nhrp_route_update_zebra(&api.prefix, &nexthop_addr, ifp); |
228 | nhrp_shortcut_prefix_change(&api.prefix, !added); | |
2fb975da TT |
229 | |
230 | return 0; | |
231 | } | |
232 | ||
996c9314 LB |
233 | int nhrp_route_get_nexthop(const union sockunion *addr, struct prefix *p, |
234 | union sockunion *via, struct interface **ifp) | |
2fb975da TT |
235 | { |
236 | struct route_node *rn; | |
237 | struct route_info *ri; | |
238 | struct prefix lookup; | |
239 | afi_t afi = family2afi(sockunion_family(addr)); | |
240 | char buf[PREFIX_STRLEN]; | |
241 | ||
242 | sockunion2hostprefix(addr, &lookup); | |
243 | ||
244 | rn = route_node_match(zebra_rib[afi], &lookup); | |
996c9314 LB |
245 | if (!rn) |
246 | return 0; | |
2fb975da TT |
247 | |
248 | ri = rn->info; | |
249 | if (ri->nhrp_ifp) { | |
250 | debugf(NHRP_DEBUG_ROUTE, "lookup %s: nhrp_if=%s", | |
0d6f7fd6 | 251 | prefix2str(&lookup, buf, sizeof(buf)), |
996c9314 | 252 | ri->nhrp_ifp->name); |
2fb975da | 253 | |
996c9314 LB |
254 | if (via) |
255 | sockunion_family(via) = AF_UNSPEC; | |
256 | if (ifp) | |
257 | *ifp = ri->nhrp_ifp; | |
2fb975da TT |
258 | } else { |
259 | debugf(NHRP_DEBUG_ROUTE, "lookup %s: zebra route dev %s", | |
0d6f7fd6 | 260 | prefix2str(&lookup, buf, sizeof(buf)), |
996c9314 | 261 | ri->ifp ? ri->ifp->name : "(none)"); |
2fb975da | 262 | |
996c9314 LB |
263 | if (via) |
264 | *via = ri->via; | |
265 | if (ifp) | |
266 | *ifp = ri->ifp; | |
2fb975da | 267 | } |
996c9314 LB |
268 | if (p) |
269 | *p = rn->p; | |
2fb975da TT |
270 | route_unlock_node(rn); |
271 | return 1; | |
272 | } | |
273 | ||
996c9314 LB |
274 | enum nhrp_route_type nhrp_route_address(struct interface *in_ifp, |
275 | union sockunion *addr, struct prefix *p, | |
276 | struct nhrp_peer **peer) | |
2fb975da TT |
277 | { |
278 | struct interface *ifp = in_ifp; | |
279 | struct nhrp_interface *nifp; | |
280 | struct nhrp_cache *c; | |
281 | union sockunion via[4]; | |
282 | uint32_t network_id = 0; | |
283 | afi_t afi = family2afi(sockunion_family(addr)); | |
284 | int i; | |
285 | ||
286 | if (ifp) { | |
287 | nifp = ifp->info; | |
288 | network_id = nifp->afi[afi].network_id; | |
289 | ||
290 | c = nhrp_cache_get(ifp, addr, 0); | |
291 | if (c && c->cur.type == NHRP_CACHE_LOCAL) { | |
996c9314 LB |
292 | if (p) |
293 | memset(p, 0, sizeof(*p)); | |
2fb975da TT |
294 | return NHRP_ROUTE_LOCAL; |
295 | } | |
296 | } | |
297 | ||
298 | for (i = 0; i < 4; i++) { | |
299 | if (!nhrp_route_get_nexthop(addr, p, &via[i], &ifp)) | |
300 | return NHRP_ROUTE_BLACKHOLE; | |
301 | if (ifp) { | |
302 | /* Departing from nbma network? */ | |
303 | nifp = ifp->info; | |
996c9314 LB |
304 | if (network_id |
305 | && network_id != nifp->afi[afi].network_id) | |
2fb975da TT |
306 | return NHRP_ROUTE_OFF_NBMA; |
307 | } | |
308 | if (sockunion_family(&via[i]) == AF_UNSPEC) | |
309 | break; | |
310 | /* Resolve via node, but return the prefix of first match */ | |
311 | addr = &via[i]; | |
312 | p = NULL; | |
313 | } | |
314 | ||
315 | if (ifp) { | |
316 | c = nhrp_cache_get(ifp, addr, 0); | |
317 | if (c && c->cur.type >= NHRP_CACHE_DYNAMIC) { | |
996c9314 LB |
318 | if (p) |
319 | memset(p, 0, sizeof(*p)); | |
2fb975da TT |
320 | if (c->cur.type == NHRP_CACHE_LOCAL) |
321 | return NHRP_ROUTE_LOCAL; | |
996c9314 LB |
322 | if (peer) |
323 | *peer = nhrp_peer_ref(c->cur.peer); | |
2fb975da TT |
324 | return NHRP_ROUTE_NBMA_NEXTHOP; |
325 | } | |
326 | } | |
327 | ||
328 | return NHRP_ROUTE_BLACKHOLE; | |
329 | } | |
330 | ||
996c9314 | 331 | static void nhrp_zebra_connected(struct zclient *zclient) |
a1f1bab0 JB |
332 | { |
333 | zclient_send_reg_requests(zclient, VRF_DEFAULT); | |
334 | zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, | |
996c9314 | 335 | ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT); |
a1f1bab0 | 336 | zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, |
996c9314 | 337 | ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT); |
a1f1bab0 JB |
338 | } |
339 | ||
2fb975da TT |
340 | void nhrp_zebra_init(void) |
341 | { | |
342 | zebra_rib[AFI_IP] = route_table_init(); | |
343 | zebra_rib[AFI_IP6] = route_table_init(); | |
344 | ||
26f63a1e | 345 | zclient = zclient_new(master, &zclient_options_default); |
a1f1bab0 | 346 | zclient->zebra_connected = nhrp_zebra_connected; |
2fb975da TT |
347 | zclient->interface_address_add = nhrp_interface_address_add; |
348 | zclient->interface_address_delete = nhrp_interface_address_delete; | |
74489921 RW |
349 | zclient->redistribute_route_add = nhrp_route_read; |
350 | zclient->redistribute_route_del = nhrp_route_read; | |
819dc8bb | 351 | |
342213ea | 352 | zclient_init(zclient, ZEBRA_ROUTE_NHRP, 0, &nhrpd_privs); |
2fb975da TT |
353 | } |
354 | ||
355 | void nhrp_zebra_terminate(void) | |
356 | { | |
357 | zclient_stop(zclient); | |
20a11b25 | 358 | zclient_free(zclient); |
2fb975da TT |
359 | route_table_finish(zebra_rib[AFI_IP]); |
360 | route_table_finish(zebra_rib[AFI_IP6]); | |
361 | } |