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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 | ||
10 | #include "nhrpd.h" | |
11 | #include "table.h" | |
12 | #include "memory.h" | |
13 | #include "stream.h" | |
14 | #include "log.h" | |
15 | #include "zclient.h" | |
16 | ||
819dc8bb DL |
17 | DEFINE_MTYPE_STATIC(NHRPD, NHRP_ROUTE, "NHRP routing entry") |
18 | ||
2fb975da TT |
19 | static struct zclient *zclient; |
20 | static struct route_table *zebra_rib[AFI_MAX]; | |
21 | ||
22 | struct route_info { | |
23 | union sockunion via; | |
24 | struct interface *ifp; | |
25 | struct interface *nhrp_ifp; | |
26 | }; | |
27 | ||
2fb975da TT |
28 | static struct route_node *nhrp_route_update_get(const struct prefix *p, int create) |
29 | { | |
30 | struct route_node *rn; | |
31 | afi_t afi = family2afi(PREFIX_FAMILY(p)); | |
32 | ||
33 | if (!zebra_rib[afi]) | |
34 | return NULL; | |
35 | ||
36 | if (create) { | |
37 | rn = route_node_get(zebra_rib[afi], p); | |
38 | if (!rn->info) { | |
39 | rn->info = XCALLOC(MTYPE_NHRP_ROUTE, sizeof(struct route_info)); | |
40 | route_lock_node(rn); | |
41 | } | |
42 | return rn; | |
43 | } else { | |
44 | return route_node_lookup(zebra_rib[afi], p); | |
45 | } | |
46 | } | |
47 | ||
48 | static void nhrp_route_update_put(struct route_node *rn) | |
49 | { | |
50 | struct route_info *ri = rn->info; | |
51 | ||
52 | if (!ri->ifp && !ri->nhrp_ifp && sockunion_family(&ri->via) == AF_UNSPEC) { | |
53 | XFREE(MTYPE_NHRP_ROUTE, rn->info); | |
54 | rn->info = NULL; | |
55 | route_unlock_node(rn); | |
56 | } | |
57 | route_unlock_node(rn); | |
58 | } | |
59 | ||
60 | static void nhrp_route_update_zebra(const struct prefix *p, union sockunion *nexthop, struct interface *ifp) | |
61 | { | |
62 | struct route_node *rn; | |
63 | struct route_info *ri; | |
64 | ||
65 | rn = nhrp_route_update_get(p, (sockunion_family(nexthop) != AF_UNSPEC) || ifp); | |
66 | if (rn) { | |
67 | ri = rn->info; | |
68 | ri->via = *nexthop; | |
69 | ri->ifp = ifp; | |
70 | nhrp_route_update_put(rn); | |
71 | } | |
72 | } | |
73 | ||
74 | void nhrp_route_update_nhrp(const struct prefix *p, struct interface *ifp) | |
75 | { | |
76 | struct route_node *rn; | |
77 | struct route_info *ri; | |
78 | ||
79 | rn = nhrp_route_update_get(p, ifp != NULL); | |
80 | if (rn) { | |
81 | ri = rn->info; | |
82 | ri->nhrp_ifp = ifp; | |
83 | nhrp_route_update_put(rn); | |
84 | } | |
85 | } | |
86 | ||
87 | void nhrp_route_announce(int add, enum nhrp_cache_type type, const struct prefix *p, struct interface *ifp, const union sockunion *nexthop, uint32_t mtu) | |
88 | { | |
9350687d RW |
89 | struct zapi_route api; |
90 | struct zapi_nexthop *api_nh; | |
2fb975da TT |
91 | |
92 | if (zclient->sock < 0) | |
93 | return; | |
94 | ||
9350687d RW |
95 | memset(&api, 0, sizeof(api)); |
96 | api.type = ZEBRA_ROUTE_NHRP; | |
97 | api.safi = SAFI_UNICAST; | |
d5b2119c | 98 | api.vrf_id = VRF_DEFAULT; |
9350687d RW |
99 | api.prefix = *p; |
100 | ||
2fb975da TT |
101 | switch (type) { |
102 | case NHRP_CACHE_NEGATIVE: | |
09a484dd DL |
103 | zapi_route_set_blackhole(&api, BLACKHOLE_REJECT); |
104 | ifp = NULL; | |
105 | nexthop = NULL; | |
2fb975da TT |
106 | break; |
107 | case NHRP_CACHE_DYNAMIC: | |
108 | case NHRP_CACHE_NHS: | |
109 | case NHRP_CACHE_STATIC: | |
110 | /* Regular route, so these are announced | |
111 | * to other routing daemons */ | |
112 | break; | |
113 | default: | |
9350687d | 114 | SET_FLAG(api.flags, ZEBRA_FLAG_FIB_OVERRIDE); |
2fb975da TT |
115 | break; |
116 | } | |
4e8b02f4 | 117 | SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION); |
2fb975da | 118 | |
9350687d RW |
119 | SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); |
120 | api.nexthop_num = 1; | |
121 | api_nh = &api.nexthops[0]; | |
4a7371e9 | 122 | api_nh->vrf_id = VRF_DEFAULT; |
2fb975da | 123 | |
9350687d RW |
124 | switch (api.prefix.family) { |
125 | case AF_INET: | |
2fb975da | 126 | if (nexthop) { |
6f27a9f6 RW |
127 | api_nh->gate.ipv4 = nexthop->sin.sin_addr; |
128 | api_nh->type = NEXTHOP_TYPE_IPV4; | |
2fb975da TT |
129 | } |
130 | if (ifp) { | |
6f27a9f6 RW |
131 | api_nh->ifindex = ifp->ifindex; |
132 | if (api_nh->type == NEXTHOP_TYPE_IPV4) | |
133 | api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX; | |
134 | else | |
135 | api_nh->type = NEXTHOP_TYPE_IFINDEX; | |
2fb975da | 136 | } |
9350687d RW |
137 | break; |
138 | case AF_INET6: | |
37dc8ab5 | 139 | if (nexthop) { |
6f27a9f6 RW |
140 | api_nh->gate.ipv6 = nexthop->sin6.sin6_addr; |
141 | api_nh->type = NEXTHOP_TYPE_IPV6; | |
37dc8ab5 TT |
142 | } |
143 | if (ifp) { | |
6f27a9f6 RW |
144 | api_nh->ifindex = ifp->ifindex; |
145 | if (api_nh->type == NEXTHOP_TYPE_IPV6) | |
146 | api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX; | |
147 | else | |
148 | api_nh->type = NEXTHOP_TYPE_IFINDEX; | |
37dc8ab5 | 149 | } |
9350687d RW |
150 | break; |
151 | } | |
152 | if (mtu) { | |
153 | SET_FLAG(api.message, ZAPI_MESSAGE_MTU); | |
154 | api.mtu = mtu; | |
155 | } | |
37dc8ab5 | 156 | |
9350687d RW |
157 | if (unlikely(debug_flags & NHRP_DEBUG_ROUTE)) { |
158 | char buf[2][PREFIX_STRLEN]; | |
37dc8ab5 | 159 | |
9350687d RW |
160 | prefix2str(&api.prefix, buf[0], sizeof(buf[0])); |
161 | zlog_debug("Zebra send: route %s %s nexthop %s metric %u" | |
162 | " count %d dev %s", | |
163 | add ? "add" : "del", buf[0], | |
164 | nexthop ? inet_ntop(api.prefix.family, &api_nh->gate, buf[1], sizeof(buf[1])) : "<onlink>", | |
09a484dd | 165 | api.metric, api.nexthop_num, ifp ? ifp->name : "none"); |
2fb975da | 166 | } |
9350687d RW |
167 | |
168 | zclient_route_send(add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE, zclient, | |
169 | &api); | |
2fb975da TT |
170 | } |
171 | ||
172 | int nhrp_route_read(int cmd, struct zclient *zclient, zebra_size_t length, vrf_id_t vrf_id) | |
173 | { | |
74489921 RW |
174 | struct zapi_route api; |
175 | struct zapi_nexthop *api_nh; | |
2fb975da | 176 | struct interface *ifp = NULL; |
2fb975da | 177 | union sockunion nexthop_addr; |
2fb975da | 178 | char buf[2][PREFIX_STRLEN]; |
74489921 | 179 | int added; |
2fb975da | 180 | |
74489921 | 181 | if (zapi_route_decode(zclient->ibuf, &api) < 0) |
2fb975da | 182 | return -1; |
74489921 RW |
183 | |
184 | /* we completely ignore srcdest routes for now. */ | |
185 | if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX)) | |
c125d1d4 RW |
186 | return 0; |
187 | ||
74489921 RW |
188 | sockunion_family(&nexthop_addr) = AF_UNSPEC; |
189 | if (CHECK_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP)) { | |
190 | api_nh = &api.nexthops[0]; | |
191 | ||
192 | nexthop_addr.sa.sa_family = api.prefix.family; | |
193 | switch (nexthop_addr.sa.sa_family) { | |
194 | case AF_INET: | |
195 | nexthop_addr.sin.sin_addr = api_nh->gate.ipv4; | |
196 | break; | |
197 | case AF_INET6: | |
198 | nexthop_addr.sin6.sin6_addr = api_nh->gate.ipv6; | |
199 | break; | |
2fb975da | 200 | } |
74489921 RW |
201 | |
202 | if (api_nh->ifindex != IFINDEX_INTERNAL) | |
203 | ifp = if_lookup_by_index(api_nh->ifindex, VRF_DEFAULT); | |
2fb975da | 204 | } |
2fb975da | 205 | |
74489921 | 206 | added = (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD); |
2fb975da TT |
207 | debugf(NHRP_DEBUG_ROUTE, "if-route-%s: %s via %s dev %s", |
208 | added ? "add" : "del", | |
74489921 | 209 | prefix2str(&api.prefix, buf[0], sizeof buf[0]), |
2fb975da TT |
210 | sockunion2str(&nexthop_addr, buf[1], sizeof buf[1]), |
211 | ifp ? ifp->name : "(none)"); | |
212 | ||
74489921 RW |
213 | nhrp_route_update_zebra(&api.prefix, &nexthop_addr, ifp); |
214 | nhrp_shortcut_prefix_change(&api.prefix, !added); | |
2fb975da TT |
215 | |
216 | return 0; | |
217 | } | |
218 | ||
219 | int nhrp_route_get_nexthop(const union sockunion *addr, struct prefix *p, union sockunion *via, struct interface **ifp) | |
220 | { | |
221 | struct route_node *rn; | |
222 | struct route_info *ri; | |
223 | struct prefix lookup; | |
224 | afi_t afi = family2afi(sockunion_family(addr)); | |
225 | char buf[PREFIX_STRLEN]; | |
226 | ||
227 | sockunion2hostprefix(addr, &lookup); | |
228 | ||
229 | rn = route_node_match(zebra_rib[afi], &lookup); | |
230 | if (!rn) return 0; | |
231 | ||
232 | ri = rn->info; | |
233 | if (ri->nhrp_ifp) { | |
234 | debugf(NHRP_DEBUG_ROUTE, "lookup %s: nhrp_if=%s", | |
235 | prefix2str(&lookup, buf, sizeof buf), | |
236 | ri->nhrp_ifp->name); | |
237 | ||
238 | if (via) sockunion_family(via) = AF_UNSPEC; | |
239 | if (ifp) *ifp = ri->nhrp_ifp; | |
240 | } else { | |
241 | debugf(NHRP_DEBUG_ROUTE, "lookup %s: zebra route dev %s", | |
242 | prefix2str(&lookup, buf, sizeof buf), | |
243 | ri->ifp ? ri->ifp->name : "(none)"); | |
244 | ||
245 | if (via) *via = ri->via; | |
246 | if (ifp) *ifp = ri->ifp; | |
247 | } | |
248 | if (p) *p = rn->p; | |
249 | route_unlock_node(rn); | |
250 | return 1; | |
251 | } | |
252 | ||
253 | enum nhrp_route_type nhrp_route_address(struct interface *in_ifp, union sockunion *addr, struct prefix *p, struct nhrp_peer **peer) | |
254 | { | |
255 | struct interface *ifp = in_ifp; | |
256 | struct nhrp_interface *nifp; | |
257 | struct nhrp_cache *c; | |
258 | union sockunion via[4]; | |
259 | uint32_t network_id = 0; | |
260 | afi_t afi = family2afi(sockunion_family(addr)); | |
261 | int i; | |
262 | ||
263 | if (ifp) { | |
264 | nifp = ifp->info; | |
265 | network_id = nifp->afi[afi].network_id; | |
266 | ||
267 | c = nhrp_cache_get(ifp, addr, 0); | |
268 | if (c && c->cur.type == NHRP_CACHE_LOCAL) { | |
269 | if (p) memset(p, 0, sizeof(*p)); | |
270 | return NHRP_ROUTE_LOCAL; | |
271 | } | |
272 | } | |
273 | ||
274 | for (i = 0; i < 4; i++) { | |
275 | if (!nhrp_route_get_nexthop(addr, p, &via[i], &ifp)) | |
276 | return NHRP_ROUTE_BLACKHOLE; | |
277 | if (ifp) { | |
278 | /* Departing from nbma network? */ | |
279 | nifp = ifp->info; | |
280 | if (network_id && network_id != nifp->afi[afi].network_id) | |
281 | return NHRP_ROUTE_OFF_NBMA; | |
282 | } | |
283 | if (sockunion_family(&via[i]) == AF_UNSPEC) | |
284 | break; | |
285 | /* Resolve via node, but return the prefix of first match */ | |
286 | addr = &via[i]; | |
287 | p = NULL; | |
288 | } | |
289 | ||
290 | if (ifp) { | |
291 | c = nhrp_cache_get(ifp, addr, 0); | |
292 | if (c && c->cur.type >= NHRP_CACHE_DYNAMIC) { | |
293 | if (p) memset(p, 0, sizeof(*p)); | |
294 | if (c->cur.type == NHRP_CACHE_LOCAL) | |
295 | return NHRP_ROUTE_LOCAL; | |
296 | if (peer) *peer = nhrp_peer_ref(c->cur.peer); | |
297 | return NHRP_ROUTE_NBMA_NEXTHOP; | |
298 | } | |
299 | } | |
300 | ||
301 | return NHRP_ROUTE_BLACKHOLE; | |
302 | } | |
303 | ||
a1f1bab0 JB |
304 | static void |
305 | nhrp_zebra_connected (struct zclient *zclient) | |
306 | { | |
307 | zclient_send_reg_requests(zclient, VRF_DEFAULT); | |
308 | zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, | |
309 | ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT); | |
310 | zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, | |
311 | ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT); | |
312 | } | |
313 | ||
2fb975da TT |
314 | void nhrp_zebra_init(void) |
315 | { | |
316 | zebra_rib[AFI_IP] = route_table_init(); | |
317 | zebra_rib[AFI_IP6] = route_table_init(); | |
318 | ||
e1a1880d | 319 | zclient = zclient_new_notify(master, &zclient_options_default); |
a1f1bab0 | 320 | zclient->zebra_connected = nhrp_zebra_connected; |
2fb975da TT |
321 | zclient->interface_add = nhrp_interface_add; |
322 | zclient->interface_delete = nhrp_interface_delete; | |
323 | zclient->interface_up = nhrp_interface_up; | |
324 | zclient->interface_down = nhrp_interface_down; | |
325 | zclient->interface_address_add = nhrp_interface_address_add; | |
326 | zclient->interface_address_delete = nhrp_interface_address_delete; | |
74489921 RW |
327 | zclient->redistribute_route_add = nhrp_route_read; |
328 | zclient->redistribute_route_del = nhrp_route_read; | |
819dc8bb | 329 | |
342213ea | 330 | zclient_init(zclient, ZEBRA_ROUTE_NHRP, 0, &nhrpd_privs); |
2fb975da TT |
331 | } |
332 | ||
333 | void nhrp_zebra_terminate(void) | |
334 | { | |
335 | zclient_stop(zclient); | |
20a11b25 | 336 | zclient_free(zclient); |
2fb975da TT |
337 | route_table_finish(zebra_rib[AFI_IP]); |
338 | route_table_finish(zebra_rib[AFI_IP6]); | |
339 | } |