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2fb975da TT |
1 | /* NHRP NHC nexthop server functions (registration) |
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 "zebra.h" | |
11 | #include "zbuf.h" | |
12 | #include "memory.h" | |
13 | #include "thread.h" | |
14 | #include "nhrpd.h" | |
15 | #include "nhrp_protocol.h" | |
16 | ||
819dc8bb DL |
17 | DEFINE_MTYPE_STATIC(NHRPD, NHRP_NHS, "NHRP next hop server") |
18 | DEFINE_MTYPE_STATIC(NHRPD, NHRP_REGISTRATION, "NHRP registration entries") | |
19 | ||
2fb975da | 20 | static int nhrp_nhs_resolve(struct thread *t); |
2fb975da TT |
21 | static int nhrp_reg_send_req(struct thread *t); |
22 | ||
23 | static void nhrp_reg_reply(struct nhrp_reqid *reqid, void *arg) | |
24 | { | |
25 | struct nhrp_packet_parser *p = arg; | |
26 | struct nhrp_registration *r = container_of(reqid, struct nhrp_registration, reqid); | |
27 | struct nhrp_nhs *nhs = r->nhs; | |
28 | struct interface *ifp = nhs->ifp; | |
29 | struct nhrp_interface *nifp = ifp->info; | |
30 | struct nhrp_extension_header *ext; | |
31 | struct nhrp_cie_header *cie; | |
32 | struct nhrp_cache *c; | |
33 | struct zbuf extpl; | |
34 | union sockunion cie_nbma, cie_proto, *proto; | |
35 | char buf[64]; | |
36 | int ok = 0, holdtime; | |
37 | ||
38 | nhrp_reqid_free(&nhrp_packet_reqid, &r->reqid); | |
39 | ||
40 | if (p->hdr->type != NHRP_PACKET_REGISTRATION_REPLY) { | |
41 | debugf(NHRP_DEBUG_COMMON, "NHS: Registration failed"); | |
42 | return; | |
43 | } | |
44 | ||
45 | debugf(NHRP_DEBUG_COMMON, "NHS: Reg.reply received"); | |
46 | ||
47 | ok = 1; | |
48 | while ((cie = nhrp_cie_pull(&p->payload, p->hdr, &cie_nbma, &cie_proto)) != NULL) { | |
49 | proto = sockunion_family(&cie_proto) != AF_UNSPEC ? &cie_proto : &p->src_proto; | |
50 | debugf(NHRP_DEBUG_COMMON, "NHS: CIE registration: %s: %d", | |
51 | sockunion2str(proto, buf, sizeof(buf)), | |
52 | cie->code); | |
53 | if (!((cie->code == NHRP_CODE_SUCCESS) || | |
54 | (cie->code == NHRP_CODE_ADMINISTRATIVELY_PROHIBITED && nhs->hub))) | |
55 | ok = 0; | |
56 | } | |
57 | ||
58 | if (!ok) | |
59 | return; | |
60 | ||
61 | /* Parse extensions */ | |
62 | sockunion_family(&nifp->nat_nbma) = AF_UNSPEC; | |
63 | while ((ext = nhrp_ext_pull(&p->extensions, &extpl)) != NULL) { | |
64 | switch (htons(ext->type) & ~NHRP_EXTENSION_FLAG_COMPULSORY) { | |
65 | case NHRP_EXTENSION_NAT_ADDRESS: | |
66 | /* NHS adds second CIE if NAT is detected */ | |
67 | if (nhrp_cie_pull(&extpl, p->hdr, &cie_nbma, &cie_proto) && | |
68 | nhrp_cie_pull(&extpl, p->hdr, &cie_nbma, &cie_proto)) { | |
69 | nifp->nat_nbma = cie_nbma; | |
70 | debugf(NHRP_DEBUG_IF, "%s: NAT detected, real NBMA address: %s", | |
71 | ifp->name, sockunion2str(&nifp->nbma, buf, sizeof(buf))); | |
72 | } | |
73 | break; | |
74 | } | |
75 | } | |
76 | ||
77 | /* Success - schedule next registration, and route NHS */ | |
78 | r->timeout = 2; | |
79 | holdtime = nifp->afi[nhs->afi].holdtime; | |
80 | THREAD_OFF(r->t_register); | |
81 | ||
82 | /* RFC 2332 5.2.3 - Registration is recommend to be renewed | |
83 | * every one third of holdtime */ | |
ffa2c898 QY |
84 | thread_add_timer(master, nhrp_reg_send_req, r, holdtime / 3, |
85 | &r->t_register); | |
2fb975da TT |
86 | |
87 | r->proto_addr = p->dst_proto; | |
88 | c = nhrp_cache_get(ifp, &p->dst_proto, 1); | |
89 | if (c) nhrp_cache_update_binding(c, NHRP_CACHE_NHS, holdtime, nhrp_peer_ref(r->peer), 0, NULL); | |
90 | } | |
91 | ||
92 | static int nhrp_reg_timeout(struct thread *t) | |
93 | { | |
94 | struct nhrp_registration *r = THREAD_ARG(t); | |
95 | struct nhrp_cache *c; | |
96 | ||
97 | r->t_register = NULL; | |
98 | ||
99 | if (r->timeout >= 16 && sockunion_family(&r->proto_addr) != AF_UNSPEC) { | |
100 | nhrp_reqid_free(&nhrp_packet_reqid, &r->reqid); | |
101 | c = nhrp_cache_get(r->nhs->ifp, &r->proto_addr, 0); | |
102 | if (c) nhrp_cache_update_binding(c, NHRP_CACHE_NHS, -1, NULL, 0, NULL); | |
103 | sockunion_family(&r->proto_addr) = AF_UNSPEC; | |
104 | } | |
105 | ||
106 | r->timeout <<= 1; | |
107 | if (r->timeout > 64) r->timeout = 2; | |
ffa2c898 QY |
108 | thread_add_timer_msec(master, nhrp_reg_send_req, r, 10, |
109 | &r->t_register); | |
2fb975da TT |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static void nhrp_reg_peer_notify(struct notifier_block *n, unsigned long cmd) | |
115 | { | |
116 | struct nhrp_registration *r = container_of(n, struct nhrp_registration, peer_notifier); | |
117 | char buf[SU_ADDRSTRLEN]; | |
118 | ||
119 | switch (cmd) { | |
120 | case NOTIFY_PEER_UP: | |
121 | case NOTIFY_PEER_DOWN: | |
122 | case NOTIFY_PEER_IFCONFIG_CHANGED: | |
123 | case NOTIFY_PEER_MTU_CHANGED: | |
124 | debugf(NHRP_DEBUG_COMMON, "NHS: Flush timer for %s", | |
125 | sockunion2str(&r->peer->vc->remote.nbma, buf, sizeof buf)); | |
126 | THREAD_TIMER_OFF(r->t_register); | |
ffa2c898 QY |
127 | thread_add_timer_msec(master, nhrp_reg_send_req, r, 10, |
128 | &r->t_register); | |
2fb975da TT |
129 | break; |
130 | } | |
131 | } | |
132 | ||
133 | static int nhrp_reg_send_req(struct thread *t) | |
134 | { | |
135 | struct nhrp_registration *r = THREAD_ARG(t); | |
136 | struct nhrp_nhs *nhs = r->nhs; | |
137 | char buf1[SU_ADDRSTRLEN], buf2[SU_ADDRSTRLEN]; | |
138 | struct interface *ifp = nhs->ifp; | |
139 | struct nhrp_interface *nifp = ifp->info; | |
140 | struct nhrp_afi_data *if_ad = &nifp->afi[nhs->afi]; | |
141 | union sockunion *dst_proto; | |
142 | struct zbuf *zb; | |
143 | struct nhrp_packet_header *hdr; | |
144 | struct nhrp_extension_header *ext; | |
145 | struct nhrp_cie_header *cie; | |
146 | ||
147 | r->t_register = NULL; | |
148 | if (!nhrp_peer_check(r->peer, 2)) { | |
149 | debugf(NHRP_DEBUG_COMMON, "NHS: Waiting link for %s", | |
150 | sockunion2str(&r->peer->vc->remote.nbma, buf1, sizeof buf1)); | |
ffa2c898 QY |
151 | thread_add_timer(master, nhrp_reg_send_req, r, 120, |
152 | &r->t_register); | |
2fb975da TT |
153 | return 0; |
154 | } | |
155 | ||
ffa2c898 QY |
156 | thread_add_timer(master, nhrp_reg_timeout, r, r->timeout, |
157 | &r->t_register); | |
2fb975da TT |
158 | |
159 | /* RFC2332 5.2.3 NHC uses it's own address as dst if NHS is unknown */ | |
160 | dst_proto = &nhs->proto_addr; | |
161 | if (sockunion_family(dst_proto) == AF_UNSPEC) | |
162 | dst_proto = &if_ad->addr; | |
163 | ||
164 | sockunion2str(&if_ad->addr, buf1, sizeof(buf1)); | |
165 | sockunion2str(dst_proto, buf2, sizeof(buf2)); | |
166 | debugf(NHRP_DEBUG_COMMON, "NHS: Register %s -> %s (timeout %d)", buf1, buf2, r->timeout); | |
167 | ||
168 | /* No protocol address configured for tunnel interface */ | |
169 | if (sockunion_family(&if_ad->addr) == AF_UNSPEC) | |
170 | return 0; | |
171 | ||
172 | zb = zbuf_alloc(1400); | |
173 | hdr = nhrp_packet_push(zb, NHRP_PACKET_REGISTRATION_REQUEST, &nifp->nbma, &if_ad->addr, dst_proto); | |
174 | hdr->hop_count = 0; | |
175 | if (!(if_ad->flags & NHRP_IFF_REG_NO_UNIQUE)) | |
176 | hdr->flags |= htons(NHRP_FLAG_REGISTRATION_UNIQUE); | |
177 | ||
178 | hdr->u.request_id = htonl(nhrp_reqid_alloc(&nhrp_packet_reqid, &r->reqid, nhrp_reg_reply)); | |
179 | ||
180 | /* FIXME: push CIE for each local protocol address */ | |
181 | cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, NULL, NULL); | |
182 | cie->prefix_length = 0xff; | |
183 | cie->holding_time = htons(if_ad->holdtime); | |
184 | cie->mtu = htons(if_ad->mtu); | |
185 | ||
186 | nhrp_ext_request(zb, hdr, ifp); | |
187 | ||
188 | /* Cisco NAT detection extension */ | |
189 | hdr->flags |= htons(NHRP_FLAG_REGISTRATION_NAT); | |
190 | ext = nhrp_ext_push(zb, hdr, NHRP_EXTENSION_NAT_ADDRESS); | |
191 | cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, &nifp->nbma, &if_ad->addr); | |
55fd6ee9 | 192 | cie->prefix_length = 8 * sockunion_get_addrlen(&if_ad->addr); |
2fb975da TT |
193 | nhrp_ext_complete(zb, ext); |
194 | ||
195 | nhrp_packet_complete(zb, hdr); | |
196 | nhrp_peer_send(r->peer, zb); | |
197 | zbuf_free(zb); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static void nhrp_reg_delete(struct nhrp_registration *r) | |
203 | { | |
204 | nhrp_peer_notify_del(r->peer, &r->peer_notifier); | |
205 | nhrp_peer_unref(r->peer); | |
206 | list_del(&r->reglist_entry); | |
207 | THREAD_OFF(r->t_register); | |
208 | XFREE(MTYPE_NHRP_REGISTRATION, r); | |
209 | } | |
210 | ||
211 | static struct nhrp_registration *nhrp_reg_by_nbma(struct nhrp_nhs *nhs, const union sockunion *nbma_addr) | |
212 | { | |
213 | struct nhrp_registration *r; | |
214 | ||
215 | list_for_each_entry(r, &nhs->reglist_head, reglist_entry) | |
216 | if (sockunion_same(&r->peer->vc->remote.nbma, nbma_addr)) | |
217 | return r; | |
218 | return NULL; | |
219 | } | |
220 | ||
221 | static void nhrp_nhs_resolve_cb(struct resolver_query *q, int n, union sockunion *addrs) | |
222 | { | |
223 | struct nhrp_nhs *nhs = container_of(q, struct nhrp_nhs, dns_resolve); | |
224 | struct nhrp_interface *nifp = nhs->ifp->info; | |
225 | struct nhrp_registration *reg, *regn; | |
226 | int i; | |
227 | ||
228 | nhs->t_resolve = NULL; | |
229 | if (n < 0) { | |
230 | /* Failed, retry in a moment */ | |
ffa2c898 QY |
231 | thread_add_timer(master, nhrp_nhs_resolve, nhs, 5, |
232 | &nhs->t_resolve); | |
2fb975da TT |
233 | return; |
234 | } | |
235 | ||
ffa2c898 QY |
236 | thread_add_timer(master, nhrp_nhs_resolve, nhs, 2 * 60 * 60, |
237 | &nhs->t_resolve); | |
2fb975da TT |
238 | |
239 | list_for_each_entry(reg, &nhs->reglist_head, reglist_entry) | |
240 | reg->mark = 1; | |
241 | ||
242 | nhs->hub = 0; | |
243 | for (i = 0; i < n; i++) { | |
244 | if (sockunion_same(&addrs[i], &nifp->nbma)) { | |
245 | nhs->hub = 1; | |
246 | continue; | |
247 | } | |
248 | ||
249 | reg = nhrp_reg_by_nbma(nhs, &addrs[i]); | |
250 | if (reg) { | |
251 | reg->mark = 0; | |
252 | continue; | |
253 | } | |
254 | ||
255 | reg = XCALLOC(MTYPE_NHRP_REGISTRATION, sizeof(*reg)); | |
256 | reg->peer = nhrp_peer_get(nhs->ifp, &addrs[i]); | |
257 | reg->nhs = nhs; | |
258 | reg->timeout = 1; | |
259 | list_init(®->reglist_entry); | |
260 | list_add_tail(®->reglist_entry, &nhs->reglist_head); | |
261 | nhrp_peer_notify_add(reg->peer, ®->peer_notifier, nhrp_reg_peer_notify); | |
ffa2c898 QY |
262 | thread_add_timer_msec(master, nhrp_reg_send_req, reg, 50, |
263 | ®->t_register); | |
2fb975da TT |
264 | } |
265 | ||
266 | list_for_each_entry_safe(reg, regn, &nhs->reglist_head, reglist_entry) { | |
267 | if (reg->mark) | |
268 | nhrp_reg_delete(reg); | |
269 | } | |
270 | } | |
271 | ||
272 | static int nhrp_nhs_resolve(struct thread *t) | |
273 | { | |
274 | struct nhrp_nhs *nhs = THREAD_ARG(t); | |
275 | ||
276 | resolver_resolve(&nhs->dns_resolve, AF_INET, nhs->nbma_fqdn, nhrp_nhs_resolve_cb); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | int nhrp_nhs_add(struct interface *ifp, afi_t afi, union sockunion *proto_addr, const char *nbma_fqdn) | |
282 | { | |
283 | struct nhrp_interface *nifp = ifp->info; | |
284 | struct nhrp_nhs *nhs; | |
285 | ||
286 | if (sockunion_family(proto_addr) != AF_UNSPEC && | |
287 | sockunion_family(proto_addr) != afi2family(afi)) | |
288 | return NHRP_ERR_PROTOCOL_ADDRESS_MISMATCH; | |
289 | ||
290 | list_for_each_entry(nhs, &nifp->afi[afi].nhslist_head, nhslist_entry) { | |
291 | if (sockunion_family(&nhs->proto_addr) != AF_UNSPEC && | |
292 | sockunion_family(proto_addr) != AF_UNSPEC && | |
293 | sockunion_same(&nhs->proto_addr, proto_addr)) | |
294 | return NHRP_ERR_ENTRY_EXISTS; | |
295 | ||
296 | if (strcmp(nhs->nbma_fqdn, nbma_fqdn) == 0) | |
297 | return NHRP_ERR_ENTRY_EXISTS; | |
298 | } | |
299 | ||
300 | nhs = XMALLOC(MTYPE_NHRP_NHS, sizeof(struct nhrp_nhs)); | |
301 | if (!nhs) return NHRP_ERR_NO_MEMORY; | |
302 | ||
303 | *nhs = (struct nhrp_nhs) { | |
304 | .afi = afi, | |
305 | .ifp = ifp, | |
306 | .proto_addr = *proto_addr, | |
307 | .nbma_fqdn = strdup(nbma_fqdn), | |
308 | .reglist_head = LIST_INITIALIZER(nhs->reglist_head), | |
309 | }; | |
310 | list_add_tail(&nhs->nhslist_entry, &nifp->afi[afi].nhslist_head); | |
ffa2c898 QY |
311 | thread_add_timer_msec(master, nhrp_nhs_resolve, nhs, 1000, |
312 | &nhs->t_resolve); | |
2fb975da TT |
313 | |
314 | return NHRP_OK; | |
315 | } | |
316 | ||
317 | int nhrp_nhs_del(struct interface *ifp, afi_t afi, union sockunion *proto_addr, const char *nbma_fqdn) | |
318 | { | |
319 | struct nhrp_interface *nifp = ifp->info; | |
320 | struct nhrp_nhs *nhs, *nnhs; | |
321 | int ret = NHRP_ERR_ENTRY_NOT_FOUND; | |
322 | ||
323 | if (sockunion_family(proto_addr) != AF_UNSPEC && | |
324 | sockunion_family(proto_addr) != afi2family(afi)) | |
325 | return NHRP_ERR_PROTOCOL_ADDRESS_MISMATCH; | |
326 | ||
327 | list_for_each_entry_safe(nhs, nnhs, &nifp->afi[afi].nhslist_head, nhslist_entry) { | |
328 | if (!sockunion_same(&nhs->proto_addr, proto_addr)) | |
329 | continue; | |
330 | if (strcmp(nhs->nbma_fqdn, nbma_fqdn) != 0) | |
331 | continue; | |
332 | ||
333 | nhrp_nhs_free(nhs); | |
334 | ret = NHRP_OK; | |
335 | } | |
336 | ||
337 | return ret; | |
338 | } | |
339 | ||
340 | int nhrp_nhs_free(struct nhrp_nhs *nhs) | |
341 | { | |
342 | struct nhrp_registration *r, *rn; | |
343 | ||
344 | list_for_each_entry_safe(r, rn, &nhs->reglist_head, reglist_entry) | |
345 | nhrp_reg_delete(r); | |
346 | THREAD_OFF(nhs->t_resolve); | |
347 | list_del(&nhs->nhslist_entry); | |
348 | free((void*) nhs->nbma_fqdn); | |
349 | XFREE(MTYPE_NHRP_NHS, nhs); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | void nhrp_nhs_terminate(void) | |
354 | { | |
355 | struct interface *ifp; | |
356 | struct nhrp_interface *nifp; | |
357 | struct nhrp_nhs *nhs, *tmp; | |
358 | struct listnode *node; | |
359 | afi_t afi; | |
360 | ||
819dc8bb | 361 | for (ALL_LIST_ELEMENTS_RO(vrf_iflist (VRF_DEFAULT), node, ifp)) { |
2fb975da TT |
362 | nifp = ifp->info; |
363 | for (afi = 0; afi < AFI_MAX; afi++) { | |
364 | list_for_each_entry_safe(nhs, tmp, &nifp->afi[afi].nhslist_head, nhslist_entry) | |
365 | nhrp_nhs_free(nhs); | |
366 | } | |
367 | } | |
368 | } | |
0ca036b4 TT |
369 | |
370 | void nhrp_nhs_foreach(struct interface *ifp, afi_t afi, void (*cb)(struct nhrp_nhs *, struct nhrp_registration *, void *), void *ctx) | |
371 | { | |
372 | struct nhrp_interface *nifp = ifp->info; | |
373 | struct nhrp_nhs *nhs; | |
374 | struct nhrp_registration *reg; | |
375 | ||
376 | list_for_each_entry(nhs, &nifp->afi[afi].nhslist_head, nhslist_entry) { | |
377 | if (!list_empty(&nhs->reglist_head)) { | |
378 | list_for_each_entry(reg, &nhs->reglist_head, reglist_entry) | |
379 | cb(nhs, reg, ctx); | |
380 | } else | |
381 | cb(nhs, 0, ctx); | |
382 | } | |
383 | } |