]>
Commit | Line | Data |
---|---|---|
98bd7ca0 | 1 | /* |
388cba45 | 2 | * Copyright (C) 2006-2014 by Internet Systems Consortium, Inc. ("ISC") |
98bd7ca0 DH |
3 | * |
4 | * Permission to use, copy, modify, and distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH | |
9 | * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY | |
10 | * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, | |
11 | * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM | |
12 | * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE | |
13 | * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR | |
14 | * PERFORMANCE OF THIS SOFTWARE. | |
15 | */ | |
16 | ||
01fa619f SR |
17 | /*! \file server/dhcpv6.c */ |
18 | ||
98bd7ca0 DH |
19 | #include "dhcpd.h" |
20 | ||
fe5b0fdd DH |
21 | #ifdef DHCPv6 |
22 | ||
98bd7ca0 DH |
23 | /* |
24 | * We use print_hex_1() to output DUID values. We could actually output | |
25 | * the DUID with more information... MAC address if using type 1 or 3, | |
26 | * and so on. However, RFC 3315 contains Grave Warnings against actually | |
27 | * attempting to understand a DUID. | |
28 | */ | |
29 | ||
30 | /* | |
31 | * TODO: gettext() or other method of localization for the messages | |
32 | * for status codes (and probably for log formats eventually) | |
33 | * TODO: refactoring (simplify, simplify, simplify) | |
34 | * TODO: support multiple shared_networks on each interface (this | |
35 | * will allow the server to issue multiple IPv6 addresses to | |
36 | * a single interface) | |
37 | */ | |
38 | ||
5279b8f3 DH |
39 | /* |
40 | * DHCPv6 Reply workflow assist. A Reply packet is built by various | |
41 | * different functions; this gives us one location where we keep state | |
42 | * regarding a reply. | |
43 | */ | |
44 | struct reply_state { | |
45 | /* root level persistent state */ | |
46 | struct shared_network *shared; | |
47 | struct host_decl *host; | |
2267da84 | 48 | struct subnet *subnet; /* Used to match fixed-addrs to subnet scopes. */ |
5279b8f3 DH |
49 | struct option_state *opt_state; |
50 | struct packet *packet; | |
51 | struct data_string client_id; | |
52 | ||
53 | /* IA level persistent state */ | |
54 | unsigned ia_count; | |
9322442f | 55 | unsigned pd_count; |
1d9774ab | 56 | unsigned client_resources; |
9322442f | 57 | isc_boolean_t resources_included; |
b024480e | 58 | isc_boolean_t static_lease; |
80c9fdb0 | 59 | unsigned static_prefixes; |
9322442f FD |
60 | struct ia_xx *ia; |
61 | struct ia_xx *old_ia; | |
5279b8f3 DH |
62 | struct option_state *reply_ia; |
63 | struct data_string fixed; | |
d9b5c150 | 64 | struct iaddrcidrnet fixed_pref; /* static prefix for logging */ |
5279b8f3 | 65 | |
9322442f | 66 | /* IAADDR/PREFIX level persistent state */ |
1d17db44 | 67 | struct iasubopt *lease; |
5279b8f3 DH |
68 | |
69 | /* | |
70 | * "t1", "t2", preferred, and valid lifetimes records for calculating | |
71 | * t1 and t2 (min/max). | |
72 | */ | |
73 | u_int32_t renew, rebind, prefer, valid; | |
74 | ||
20ae1aff | 75 | /* Client-requested valid and preferred lifetimes. */ |
5279b8f3 DH |
76 | u_int32_t client_valid, client_prefer; |
77 | ||
78 | /* Chosen values to transmit for valid and preferred lifetimes. */ | |
79 | u_int32_t send_valid, send_prefer; | |
80 | ||
80c9fdb0 FD |
81 | /* Preferred prefix length (-1 is any). */ |
82 | int preflen; | |
83 | ||
20ae1aff | 84 | /* Index into the data field that has been consumed. */ |
5279b8f3 DH |
85 | unsigned cursor; |
86 | ||
a7341359 SR |
87 | /* Space for the on commit statements for a fixed host */ |
88 | struct on_star on_star; | |
89 | ||
5279b8f3 DH |
90 | union reply_buffer { |
91 | unsigned char data[65536]; | |
92 | struct dhcpv6_packet reply; | |
93 | } buf; | |
94 | }; | |
95 | ||
98bd7ca0 DH |
96 | /* |
97 | * Prototypes local to this file. | |
98 | */ | |
8eab95f2 DH |
99 | static int get_encapsulated_IA_state(struct option_state **enc_opt_state, |
100 | struct data_string *enc_opt_data, | |
101 | struct packet *packet, | |
102 | struct option_cache *oc, | |
103 | int offset); | |
98bd7ca0 | 104 | static void build_dhcpv6_reply(struct data_string *, struct packet *); |
bd72740e FD |
105 | static isc_result_t shared_network_from_packet6(struct shared_network **shared, |
106 | struct packet *packet); | |
5279b8f3 DH |
107 | static void seek_shared_host(struct host_decl **hp, |
108 | struct shared_network *shared); | |
109 | static isc_boolean_t fixed_matches_shared(struct host_decl *host, | |
110 | struct shared_network *shared); | |
1d9774ab FD |
111 | static isc_result_t reply_process_ia_na(struct reply_state *reply, |
112 | struct option_cache *ia); | |
80c9fdb0 FD |
113 | static isc_result_t reply_process_ia_ta(struct reply_state *reply, |
114 | struct option_cache *ia); | |
5279b8f3 DH |
115 | static isc_result_t reply_process_addr(struct reply_state *reply, |
116 | struct option_cache *addr); | |
117 | static isc_boolean_t address_is_owned(struct reply_state *reply, | |
118 | struct iaddr *addr); | |
783259b1 FD |
119 | static isc_boolean_t temporary_is_available(struct reply_state *reply, |
120 | struct iaddr *addr); | |
80c9fdb0 | 121 | static isc_result_t find_client_temporaries(struct reply_state *reply); |
5279b8f3 DH |
122 | static isc_result_t reply_process_try_addr(struct reply_state *reply, |
123 | struct iaddr *addr); | |
124 | static isc_result_t find_client_address(struct reply_state *reply); | |
125 | static isc_result_t reply_process_is_addressed(struct reply_state *reply, | |
126 | struct binding_scope **scope, | |
127 | struct group *group); | |
128 | static isc_result_t reply_process_send_addr(struct reply_state *reply, | |
129 | struct iaddr *addr); | |
1d17db44 FD |
130 | static struct iasubopt *lease_compare(struct iasubopt *alpha, |
131 | struct iasubopt *beta); | |
80c9fdb0 FD |
132 | static isc_result_t reply_process_ia_pd(struct reply_state *reply, |
133 | struct option_cache *ia_pd); | |
134 | static isc_result_t reply_process_prefix(struct reply_state *reply, | |
135 | struct option_cache *pref); | |
136 | static isc_boolean_t prefix_is_owned(struct reply_state *reply, | |
137 | struct iaddrcidrnet *pref); | |
138 | static isc_result_t find_client_prefix(struct reply_state *reply); | |
139 | static isc_result_t reply_process_try_prefix(struct reply_state *reply, | |
140 | struct iaddrcidrnet *pref); | |
141 | static isc_result_t reply_process_is_prefixed(struct reply_state *reply, | |
80c9fdb0 FD |
142 | struct binding_scope **scope, |
143 | struct group *group); | |
144 | static isc_result_t reply_process_send_prefix(struct reply_state *reply, | |
145 | struct iaddrcidrnet *pref); | |
1d17db44 FD |
146 | static struct iasubopt *prefix_compare(struct reply_state *reply, |
147 | struct iasubopt *alpha, | |
148 | struct iasubopt *beta); | |
c900c5b2 DH |
149 | static int find_hosts_by_duid_chaddr(struct host_decl **host, |
150 | const struct data_string *client_id); | |
ad80055f SR |
151 | static void schedule_lease_timeout_reply(struct reply_state *reply); |
152 | ||
153 | /* | |
154 | * Schedule lease timeouts for all of the iasubopts in the reply. | |
155 | * This is currently used to schedule timeouts for soft leases. | |
156 | */ | |
157 | ||
158 | static void | |
159 | schedule_lease_timeout_reply(struct reply_state *reply) { | |
160 | struct iasubopt *tmp; | |
161 | int i; | |
162 | ||
163 | /* sanity check the reply */ | |
164 | if ((reply == NULL) || (reply->ia == NULL) || (reply->ia->iasubopt == NULL)) | |
165 | return; | |
166 | ||
167 | /* walk through the list, scheduling as we go */ | |
168 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { | |
169 | tmp = reply->ia->iasubopt[i]; | |
170 | schedule_lease_timeout(tmp->ipv6_pool); | |
171 | } | |
172 | } | |
173 | ||
98bd7ca0 DH |
174 | /* |
175 | * This function returns the time since DUID time start for the | |
176 | * given time_t value. | |
177 | */ | |
178 | static u_int32_t | |
179 | duid_time(time_t when) { | |
180 | /* | |
181 | * This time is modulo 2^32. | |
182 | */ | |
183 | while ((when - DUID_TIME_EPOCH) > 4294967295u) { | |
184 | /* use 2^31 to avoid spurious compiler warnings */ | |
185 | when -= 2147483648u; | |
186 | when -= 2147483648u; | |
187 | } | |
188 | ||
189 | return when - DUID_TIME_EPOCH; | |
190 | } | |
191 | ||
192 | ||
193 | /* | |
194 | * Server DUID. | |
195 | * | |
196 | * This must remain the same for the lifetime of this server, because | |
197 | * clients return the server DUID that we sent them in Request packets. | |
198 | * | |
199 | * We pick the server DUID like this: | |
200 | * | |
201 | * 1. Check dhcpd.conf - any value the administrator has configured | |
202 | * overrides any possible values. | |
203 | * 2. Check the leases.txt - we want to use the previous value if | |
204 | * possible. | |
205 | * 3. Check if dhcpd.conf specifies a type of server DUID to use, | |
206 | * and generate that type. | |
207 | * 4. Generate a type 1 (time + hardware address) DUID. | |
208 | */ | |
209 | static struct data_string server_duid; | |
210 | ||
211 | /* | |
212 | * Check if the server_duid has been set. | |
213 | */ | |
783259b1 | 214 | isc_boolean_t |
98bd7ca0 DH |
215 | server_duid_isset(void) { |
216 | return (server_duid.data != NULL); | |
217 | } | |
218 | ||
219 | /* | |
220 | * Return the server_duid. | |
221 | */ | |
222 | void | |
223 | copy_server_duid(struct data_string *ds, const char *file, int line) { | |
224 | data_string_copy(ds, &server_duid, file, line); | |
225 | } | |
226 | ||
227 | /* | |
228 | * Set the server DUID to a specified value. This is used when | |
229 | * the server DUID is stored in persistent memory (basically the | |
230 | * leases.txt file). | |
231 | */ | |
232 | void | |
233 | set_server_duid(struct data_string *new_duid) { | |
234 | /* INSIST(new_duid != NULL); */ | |
235 | /* INSIST(new_duid->data != NULL); */ | |
236 | ||
237 | if (server_duid_isset()) { | |
238 | data_string_forget(&server_duid, MDL); | |
239 | } | |
240 | data_string_copy(&server_duid, new_duid, MDL); | |
241 | } | |
242 | ||
243 | ||
244 | /* | |
245 | * Set the server DUID based on the D6O_SERVERID option. This handles | |
246 | * the case where the administrator explicitly put it in the dhcpd.conf | |
247 | * file. | |
248 | */ | |
249 | isc_result_t | |
250 | set_server_duid_from_option(void) { | |
251 | struct option_state *opt_state; | |
252 | struct option_cache *oc; | |
253 | struct data_string option_duid; | |
254 | isc_result_t ret_val; | |
255 | ||
256 | opt_state = NULL; | |
257 | if (!option_state_allocate(&opt_state, MDL)) { | |
258 | log_fatal("No memory for server DUID."); | |
259 | } | |
260 | ||
261 | execute_statements_in_scope(NULL, NULL, NULL, NULL, NULL, | |
a7341359 SR |
262 | opt_state, &global_scope, root_group, |
263 | NULL, NULL); | |
98bd7ca0 DH |
264 | |
265 | oc = lookup_option(&dhcpv6_universe, opt_state, D6O_SERVERID); | |
266 | if (oc == NULL) { | |
267 | ret_val = ISC_R_NOTFOUND; | |
268 | } else { | |
269 | memset(&option_duid, 0, sizeof(option_duid)); | |
783259b1 FD |
270 | if (!evaluate_option_cache(&option_duid, NULL, NULL, NULL, |
271 | opt_state, NULL, &global_scope, | |
98bd7ca0 DH |
272 | oc, MDL)) { |
273 | ret_val = ISC_R_UNEXPECTED; | |
274 | } else { | |
275 | set_server_duid(&option_duid); | |
276 | data_string_forget(&option_duid, MDL); | |
277 | ret_val = ISC_R_SUCCESS; | |
278 | } | |
279 | } | |
280 | ||
281 | option_state_dereference(&opt_state, MDL); | |
282 | ||
283 | return ret_val; | |
284 | } | |
285 | ||
286 | /* | |
287 | * DUID layout, as defined in RFC 3315, section 9. | |
288 | * | |
289 | * We support type 1 (hardware address plus time) and type 3 (hardware | |
290 | * address). | |
291 | * | |
292 | * We can support type 2 for specific vendors in the future, if they | |
293 | * publish the specification. And of course there may be additional | |
294 | * types later. | |
295 | */ | |
296 | static int server_duid_type = DUID_LLT; | |
297 | ||
298 | /* | |
299 | * Set the DUID type. | |
300 | */ | |
301 | void | |
302 | set_server_duid_type(int type) { | |
303 | server_duid_type = type; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Generate a new server DUID. This is done if there was no DUID in | |
308 | * the leases.txt or in the dhcpd.conf file. | |
309 | */ | |
310 | isc_result_t | |
311 | generate_new_server_duid(void) { | |
312 | struct interface_info *p; | |
313 | u_int32_t time_val; | |
314 | struct data_string generated_duid; | |
315 | ||
316 | /* | |
317 | * Verify we have a type that we support. | |
318 | */ | |
319 | if ((server_duid_type != DUID_LL) && (server_duid_type != DUID_LLT)) { | |
320 | log_error("Invalid DUID type %d specified, " | |
321 | "only LL and LLT types supported", server_duid_type); | |
98bf1607 | 322 | return DHCP_R_INVALIDARG; |
98bd7ca0 DH |
323 | } |
324 | ||
325 | /* | |
326 | * Find an interface with a hardware address. | |
327 | * Any will do. :) | |
328 | */ | |
329 | for (p = interfaces; p != NULL; p = p->next) { | |
330 | if (p->hw_address.hlen > 0) { | |
331 | break; | |
332 | } | |
333 | } | |
334 | if (p == NULL) { | |
335 | return ISC_R_UNEXPECTED; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Build our DUID. | |
340 | */ | |
341 | memset(&generated_duid, 0, sizeof(generated_duid)); | |
342 | if (server_duid_type == DUID_LLT) { | |
343 | time_val = duid_time(time(NULL)); | |
344 | generated_duid.len = 8 + p->hw_address.hlen - 1; | |
783259b1 | 345 | if (!buffer_allocate(&generated_duid.buffer, |
98bd7ca0 DH |
346 | generated_duid.len, MDL)) { |
347 | log_fatal("No memory for server DUID."); | |
348 | } | |
349 | generated_duid.data = generated_duid.buffer->data; | |
350 | putUShort(generated_duid.buffer->data, DUID_LLT); | |
783259b1 | 351 | putUShort(generated_duid.buffer->data + 2, |
98bd7ca0 DH |
352 | p->hw_address.hbuf[0]); |
353 | putULong(generated_duid.buffer->data + 4, time_val); | |
783259b1 | 354 | memcpy(generated_duid.buffer->data + 8, |
98bd7ca0 DH |
355 | p->hw_address.hbuf+1, p->hw_address.hlen-1); |
356 | } else if (server_duid_type == DUID_LL) { | |
357 | generated_duid.len = 4 + p->hw_address.hlen - 1; | |
783259b1 | 358 | if (!buffer_allocate(&generated_duid.buffer, |
98bd7ca0 DH |
359 | generated_duid.len, MDL)) { |
360 | log_fatal("No memory for server DUID."); | |
361 | } | |
362 | generated_duid.data = generated_duid.buffer->data; | |
363 | putUShort(generated_duid.buffer->data, DUID_LL); | |
783259b1 | 364 | putUShort(generated_duid.buffer->data + 2, |
98bd7ca0 | 365 | p->hw_address.hbuf[0]); |
783259b1 | 366 | memcpy(generated_duid.buffer->data + 4, |
98bd7ca0 DH |
367 | p->hw_address.hbuf+1, p->hw_address.hlen-1); |
368 | } else { | |
369 | log_fatal("Unsupported server DUID type %d.", server_duid_type); | |
783259b1 | 370 | } |
98bd7ca0 DH |
371 | |
372 | set_server_duid(&generated_duid); | |
373 | data_string_forget(&generated_duid, MDL); | |
374 | ||
375 | return ISC_R_SUCCESS; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Get the client identifier from the packet. | |
380 | */ | |
381 | isc_result_t | |
382 | get_client_id(struct packet *packet, struct data_string *client_id) { | |
383 | struct option_cache *oc; | |
384 | ||
385 | /* | |
386 | * Verify our client_id structure is empty. | |
387 | */ | |
388 | if ((client_id->data != NULL) || (client_id->len != 0)) { | |
98bf1607 | 389 | return DHCP_R_INVALIDARG; |
98bd7ca0 DH |
390 | } |
391 | ||
392 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_CLIENTID); | |
393 | if (oc == NULL) { | |
394 | return ISC_R_NOTFOUND; | |
395 | } | |
396 | ||
783259b1 | 397 | if (!evaluate_option_cache(client_id, packet, NULL, NULL, |
98bd7ca0 DH |
398 | packet->options, NULL, |
399 | &global_scope, oc, MDL)) { | |
400 | return ISC_R_FAILURE; | |
401 | } | |
402 | ||
403 | return ISC_R_SUCCESS; | |
404 | } | |
405 | ||
406 | /* | |
407 | * Message validation, defined in RFC 3315, sections 15.2, 15.5, 15.7: | |
408 | * | |
409 | * Servers MUST discard any Solicit messages that do not include a | |
410 | * Client Identifier option or that do include a Server Identifier | |
411 | * option. | |
412 | */ | |
413 | int | |
414 | valid_client_msg(struct packet *packet, struct data_string *client_id) { | |
415 | int ret_val; | |
416 | struct option_cache *oc; | |
417 | struct data_string data; | |
418 | ||
419 | ret_val = 0; | |
420 | memset(client_id, 0, sizeof(*client_id)); | |
421 | memset(&data, 0, sizeof(data)); | |
422 | ||
423 | switch (get_client_id(packet, client_id)) { | |
424 | case ISC_R_SUCCESS: | |
425 | break; | |
426 | case ISC_R_NOTFOUND: | |
427 | log_debug("Discarding %s from %s; " | |
783259b1 | 428 | "client identifier missing", |
98bd7ca0 DH |
429 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
430 | piaddr(packet->client_addr)); | |
431 | goto exit; | |
432 | default: | |
433 | log_error("Error processing %s from %s; " | |
434 | "unable to evaluate Client Identifier", | |
435 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
436 | piaddr(packet->client_addr)); | |
437 | goto exit; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Required by RFC 3315, section 15. | |
442 | */ | |
443 | if (packet->unicast) { | |
444 | log_debug("Discarding %s from %s; packet sent unicast " | |
783259b1 | 445 | "(CLIENTID %s)", |
98bd7ca0 DH |
446 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
447 | piaddr(packet->client_addr), | |
c382bc98 | 448 | print_hex_1(client_id->len, client_id->data, 60)); |
98bd7ca0 DH |
449 | goto exit; |
450 | } | |
451 | ||
452 | ||
453 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); | |
454 | if (oc != NULL) { | |
455 | if (evaluate_option_cache(&data, packet, NULL, NULL, | |
783259b1 | 456 | packet->options, NULL, |
98bd7ca0 | 457 | &global_scope, oc, MDL)) { |
783259b1 | 458 | log_debug("Discarding %s from %s; " |
98bd7ca0 | 459 | "server identifier found " |
783259b1 | 460 | "(CLIENTID %s, SERVERID %s)", |
98bd7ca0 DH |
461 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
462 | piaddr(packet->client_addr), | |
783259b1 | 463 | print_hex_1(client_id->len, |
98bd7ca0 DH |
464 | client_id->data, 60), |
465 | print_hex_2(data.len, | |
466 | data.data, 60)); | |
467 | } else { | |
783259b1 | 468 | log_debug("Discarding %s from %s; " |
98bd7ca0 | 469 | "server identifier found " |
783259b1 | 470 | "(CLIENTID %s)", |
98bd7ca0 | 471 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
783259b1 | 472 | print_hex_1(client_id->len, |
98bd7ca0 DH |
473 | client_id->data, 60), |
474 | piaddr(packet->client_addr)); | |
475 | } | |
476 | goto exit; | |
477 | } | |
478 | ||
479 | /* looks good */ | |
480 | ret_val = 1; | |
481 | ||
482 | exit: | |
483 | if (data.len > 0) { | |
484 | data_string_forget(&data, MDL); | |
485 | } | |
486 | if (!ret_val) { | |
487 | if (client_id->len > 0) { | |
488 | data_string_forget(client_id, MDL); | |
489 | } | |
490 | } | |
491 | return ret_val; | |
492 | } | |
493 | ||
494 | /* | |
495 | * Response validation, defined in RFC 3315, sections 15.4, 15.6, 15.8, | |
496 | * 15.9 (slightly different wording, but same meaning): | |
497 | * | |
498 | * Servers MUST discard any received Request message that meet any of | |
499 | * the following conditions: | |
500 | * | |
501 | * - the message does not include a Server Identifier option. | |
502 | * - the contents of the Server Identifier option do not match the | |
503 | * server's DUID. | |
504 | * - the message does not include a Client Identifier option. | |
505 | */ | |
506 | int | |
507 | valid_client_resp(struct packet *packet, | |
508 | struct data_string *client_id, | |
c382bc98 SK |
509 | struct data_string *server_id) |
510 | { | |
98bd7ca0 DH |
511 | int ret_val; |
512 | struct option_cache *oc; | |
513 | ||
514 | /* INSIST((duid.data != NULL) && (duid.len > 0)); */ | |
515 | ||
516 | ret_val = 0; | |
517 | memset(client_id, 0, sizeof(*client_id)); | |
518 | memset(server_id, 0, sizeof(*server_id)); | |
519 | ||
520 | switch (get_client_id(packet, client_id)) { | |
521 | case ISC_R_SUCCESS: | |
522 | break; | |
523 | case ISC_R_NOTFOUND: | |
524 | log_debug("Discarding %s from %s; " | |
783259b1 | 525 | "client identifier missing", |
98bd7ca0 DH |
526 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
527 | piaddr(packet->client_addr)); | |
528 | goto exit; | |
529 | default: | |
530 | log_error("Error processing %s from %s; " | |
531 | "unable to evaluate Client Identifier", | |
532 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
533 | piaddr(packet->client_addr)); | |
534 | goto exit; | |
535 | } | |
536 | ||
537 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); | |
538 | if (oc == NULL) { | |
539 | log_debug("Discarding %s from %s: " | |
783259b1 | 540 | "server identifier missing (CLIENTID %s)", |
98bd7ca0 DH |
541 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
542 | piaddr(packet->client_addr), | |
543 | print_hex_1(client_id->len, client_id->data, 60)); | |
544 | goto exit; | |
545 | } | |
783259b1 | 546 | if (!evaluate_option_cache(server_id, packet, NULL, NULL, |
98bd7ca0 DH |
547 | packet->options, NULL, |
548 | &global_scope, oc, MDL)) { | |
549 | log_error("Error processing %s from %s; " | |
550 | "unable to evaluate Server Identifier (CLIENTID %s)", | |
551 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
552 | piaddr(packet->client_addr), | |
553 | print_hex_1(client_id->len, client_id->data, 60)); | |
554 | goto exit; | |
555 | } | |
783259b1 | 556 | if ((server_duid.len != server_id->len) || |
98bd7ca0 | 557 | (memcmp(server_duid.data, server_id->data, server_duid.len) != 0)) { |
783259b1 | 558 | log_debug("Discarding %s from %s; " |
98bd7ca0 | 559 | "not our server identifier " |
783259b1 | 560 | "(CLIENTID %s, SERVERID %s, server DUID %s)", |
98bd7ca0 DH |
561 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
562 | piaddr(packet->client_addr), | |
563 | print_hex_1(client_id->len, client_id->data, 60), | |
564 | print_hex_2(server_id->len, server_id->data, 60), | |
565 | print_hex_3(server_duid.len, server_duid.data, 60)); | |
566 | goto exit; | |
567 | } | |
568 | ||
569 | /* looks good */ | |
570 | ret_val = 1; | |
571 | ||
572 | exit: | |
573 | if (!ret_val) { | |
574 | if (server_id->len > 0) { | |
575 | data_string_forget(server_id, MDL); | |
576 | } | |
577 | if (client_id->len > 0) { | |
578 | data_string_forget(client_id, MDL); | |
579 | } | |
580 | } | |
581 | return ret_val; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Information request validation, defined in RFC 3315, section 15.12: | |
586 | * | |
587 | * Servers MUST discard any received Information-request message that | |
588 | * meets any of the following conditions: | |
589 | * | |
590 | * - The message includes a Server Identifier option and the DUID in | |
591 | * the option does not match the server's DUID. | |
592 | * | |
593 | * - The message includes an IA option. | |
594 | */ | |
595 | int | |
596 | valid_client_info_req(struct packet *packet, struct data_string *server_id) { | |
597 | int ret_val; | |
598 | struct option_cache *oc; | |
c382bc98 SK |
599 | struct data_string client_id; |
600 | char client_id_str[80]; /* print_hex_1() uses maximum 60 characters, | |
601 | plus a few more for extra information */ | |
98bd7ca0 DH |
602 | |
603 | ret_val = 0; | |
604 | memset(server_id, 0, sizeof(*server_id)); | |
0f750c4f | 605 | memset(&client_id, 0, sizeof(client_id)); |
98bd7ca0 | 606 | |
c382bc98 SK |
607 | /* |
608 | * Make a string that we can print out to give more | |
609 | * information about the client if we need to. | |
610 | * | |
611 | * By RFC 3315, Section 18.1.5 clients SHOULD have a | |
612 | * client-id on an Information-request packet, but it | |
613 | * is not strictly necessary. | |
614 | */ | |
615 | if (get_client_id(packet, &client_id) == ISC_R_SUCCESS) { | |
616 | snprintf(client_id_str, sizeof(client_id_str), " (CLIENTID %s)", | |
617 | print_hex_1(client_id.len, client_id.data, 60)); | |
618 | data_string_forget(&client_id, MDL); | |
619 | } else { | |
620 | client_id_str[0] = '\0'; | |
621 | } | |
622 | ||
98bd7ca0 DH |
623 | /* |
624 | * Required by RFC 3315, section 15. | |
625 | */ | |
626 | if (packet->unicast) { | |
c382bc98 | 627 | log_debug("Discarding %s from %s; packet sent unicast%s", |
98bd7ca0 | 628 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
c382bc98 | 629 | piaddr(packet->client_addr), client_id_str); |
98bd7ca0 DH |
630 | goto exit; |
631 | } | |
632 | ||
633 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); | |
634 | if (oc != NULL) { | |
635 | log_debug("Discarding %s from %s; " | |
783259b1 | 636 | "IA_NA option present%s", |
98bd7ca0 | 637 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
c382bc98 | 638 | piaddr(packet->client_addr), client_id_str); |
98bd7ca0 DH |
639 | goto exit; |
640 | } | |
641 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); | |
642 | if (oc != NULL) { | |
643 | log_debug("Discarding %s from %s; " | |
783259b1 | 644 | "IA_TA option present%s", |
98bd7ca0 | 645 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
c382bc98 | 646 | piaddr(packet->client_addr), client_id_str); |
98bd7ca0 DH |
647 | goto exit; |
648 | } | |
1d9774ab FD |
649 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); |
650 | if (oc != NULL) { | |
651 | log_debug("Discarding %s from %s; " | |
783259b1 | 652 | "IA_PD option present%s", |
1d9774ab FD |
653 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
654 | piaddr(packet->client_addr), client_id_str); | |
655 | goto exit; | |
656 | } | |
98bd7ca0 DH |
657 | |
658 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); | |
659 | if (oc != NULL) { | |
783259b1 | 660 | if (!evaluate_option_cache(server_id, packet, NULL, NULL, |
98bd7ca0 DH |
661 | packet->options, NULL, |
662 | &global_scope, oc, MDL)) { | |
663 | log_error("Error processing %s from %s; " | |
c382bc98 | 664 | "unable to evaluate Server Identifier%s", |
98bd7ca0 | 665 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
c382bc98 | 666 | piaddr(packet->client_addr), client_id_str); |
98bd7ca0 DH |
667 | goto exit; |
668 | } | |
783259b1 FD |
669 | if ((server_duid.len != server_id->len) || |
670 | (memcmp(server_duid.data, server_id->data, | |
98bd7ca0 | 671 | server_duid.len) != 0)) { |
783259b1 | 672 | log_debug("Discarding %s from %s; " |
98bd7ca0 | 673 | "not our server identifier " |
783259b1 | 674 | "(SERVERID %s, server DUID %s)%s", |
98bd7ca0 DH |
675 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
676 | piaddr(packet->client_addr), | |
783259b1 | 677 | print_hex_1(server_id->len, |
98bd7ca0 | 678 | server_id->data, 60), |
783259b1 | 679 | print_hex_2(server_duid.len, |
c382bc98 SK |
680 | server_duid.data, 60), |
681 | client_id_str); | |
98bd7ca0 DH |
682 | goto exit; |
683 | } | |
684 | } | |
685 | ||
686 | /* looks good */ | |
687 | ret_val = 1; | |
688 | ||
689 | exit: | |
690 | if (!ret_val) { | |
691 | if (server_id->len > 0) { | |
692 | data_string_forget(server_id, MDL); | |
693 | } | |
694 | } | |
695 | return ret_val; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Options that we want to send, in addition to what was requested | |
700 | * via the ORO. | |
701 | */ | |
702 | static const int required_opts[] = { | |
703 | D6O_CLIENTID, | |
704 | D6O_SERVERID, | |
705 | D6O_STATUS_CODE, | |
76db44f9 | 706 | D6O_PREFERENCE, |
98bd7ca0 DH |
707 | 0 |
708 | }; | |
709 | static const int required_opts_solicit[] = { | |
710 | D6O_CLIENTID, | |
711 | D6O_SERVERID, | |
712 | D6O_IA_NA, | |
713 | D6O_IA_TA, | |
1d9774ab | 714 | D6O_IA_PD, |
98bd7ca0 DH |
715 | D6O_RAPID_COMMIT, |
716 | D6O_STATUS_CODE, | |
98bd7ca0 | 717 | D6O_RECONF_ACCEPT, |
76db44f9 | 718 | D6O_PREFERENCE, |
98bd7ca0 DH |
719 | 0 |
720 | }; | |
2b964ac0 FD |
721 | static const int required_opts_agent[] = { |
722 | D6O_INTERFACE_ID, | |
723 | D6O_RELAY_MSG, | |
724 | 0 | |
725 | }; | |
80c9fdb0 | 726 | static const int required_opts_IA[] = { |
1d9774ab FD |
727 | D6O_IAADDR, |
728 | D6O_STATUS_CODE, | |
1d9774ab FD |
729 | 0 |
730 | }; | |
731 | static const int required_opts_IA_PD[] = { | |
732 | D6O_IAPREFIX, | |
733 | D6O_STATUS_CODE, | |
1d9774ab FD |
734 | 0 |
735 | }; | |
98bd7ca0 DH |
736 | static const int required_opts_STATUS_CODE[] = { |
737 | D6O_STATUS_CODE, | |
738 | 0 | |
739 | }; | |
740 | ||
741 | /* | |
8eab95f2 DH |
742 | * Extracts from packet contents an IA_* option, storing the IA structure |
743 | * in its entirety in enc_opt_data, and storing any decoded DHCPv6 options | |
744 | * in enc_opt_state for later lookup and evaluation. The 'offset' indicates | |
745 | * where in the IA_* the DHCPv6 options commence. | |
98bd7ca0 DH |
746 | */ |
747 | static int | |
783259b1 | 748 | get_encapsulated_IA_state(struct option_state **enc_opt_state, |
98bd7ca0 DH |
749 | struct data_string *enc_opt_data, |
750 | struct packet *packet, | |
8eab95f2 DH |
751 | struct option_cache *oc, |
752 | int offset) | |
c382bc98 | 753 | { |
98bd7ca0 DH |
754 | /* |
755 | * Get the raw data for the encapsulated options. | |
756 | */ | |
757 | memset(enc_opt_data, 0, sizeof(*enc_opt_data)); | |
758 | if (!evaluate_option_cache(enc_opt_data, packet, | |
759 | NULL, NULL, packet->options, NULL, | |
760 | &global_scope, oc, MDL)) { | |
761 | log_error("get_encapsulated_IA_state: " | |
762 | "error evaluating raw option."); | |
763 | return 0; | |
764 | } | |
8eab95f2 | 765 | if (enc_opt_data->len < offset) { |
98bd7ca0 DH |
766 | log_error("get_encapsulated_IA_state: raw option too small."); |
767 | data_string_forget(enc_opt_data, MDL); | |
768 | return 0; | |
769 | } | |
770 | ||
771 | /* | |
772 | * Now create the option state structure, and pass it to the | |
773 | * function that parses options. | |
774 | */ | |
775 | *enc_opt_state = NULL; | |
776 | if (!option_state_allocate(enc_opt_state, MDL)) { | |
777 | log_error("get_encapsulated_IA_state: no memory for options."); | |
778 | data_string_forget(enc_opt_data, MDL); | |
779 | return 0; | |
780 | } | |
783259b1 | 781 | if (!parse_option_buffer(*enc_opt_state, |
8eab95f2 DH |
782 | enc_opt_data->data + offset, |
783 | enc_opt_data->len - offset, | |
98bd7ca0 DH |
784 | &dhcpv6_universe)) { |
785 | log_error("get_encapsulated_IA_state: error parsing options."); | |
786 | option_state_dereference(enc_opt_state, MDL); | |
787 | data_string_forget(enc_opt_data, MDL); | |
788 | return 0; | |
789 | } | |
790 | ||
791 | return 1; | |
792 | } | |
793 | ||
794 | static int | |
795 | set_status_code(u_int16_t status_code, const char *status_message, | |
c382bc98 SK |
796 | struct option_state *opt_state) |
797 | { | |
98bd7ca0 DH |
798 | struct data_string d; |
799 | int ret_val; | |
800 | ||
801 | memset(&d, 0, sizeof(d)); | |
802 | d.len = sizeof(status_code) + strlen(status_message); | |
803 | if (!buffer_allocate(&d.buffer, d.len, MDL)) { | |
804 | log_fatal("set_status_code: no memory for status code."); | |
805 | } | |
806 | d.data = d.buffer->data; | |
807 | putUShort(d.buffer->data, status_code); | |
808 | memcpy(d.buffer->data + sizeof(status_code), | |
809 | status_message, d.len - sizeof(status_code)); | |
810 | if (!save_option_buffer(&dhcpv6_universe, opt_state, | |
28868515 | 811 | d.buffer, (unsigned char *)d.data, d.len, |
98bd7ca0 DH |
812 | D6O_STATUS_CODE, 0)) { |
813 | log_error("set_status_code: error saving status code."); | |
814 | ret_val = 0; | |
815 | } else { | |
816 | ret_val = 1; | |
817 | } | |
818 | data_string_forget(&d, MDL); | |
819 | return ret_val; | |
820 | } | |
821 | ||
250f7134 SR |
822 | void check_pool6_threshold(struct reply_state *reply, |
823 | struct iasubopt *lease) | |
824 | { | |
825 | struct ipv6_pond *pond; | |
826 | int used, count, high_threshold, poolhigh = 0, poollow = 0; | |
827 | char *shared_name = "no name"; | |
828 | char tmp_addr[INET6_ADDRSTRLEN]; | |
829 | ||
830 | if ((lease->ipv6_pool == NULL) || (lease->ipv6_pool->ipv6_pond == NULL)) | |
831 | return; | |
832 | pond = lease->ipv6_pool->ipv6_pond; | |
833 | ||
834 | count = pond->num_total; | |
835 | used = pond->num_active; | |
836 | ||
837 | /* The logged flag indicates if we have already crossed the high | |
838 | * threshold and emitted a log message. If it is set we check to | |
839 | * see if we have re-crossed the low threshold and need to reset | |
840 | * things. When we cross the high threshold we determine what | |
841 | * the low threshold is and save it into the low_threshold value. | |
842 | * When we cross that threshold we reset the logged flag and | |
843 | * the low_threshold to 0 which allows the high threshold message | |
844 | * to be emitted once again. | |
845 | * if we haven't recrossed the boundry we don't need to do anything. | |
846 | */ | |
847 | if (pond->logged !=0) { | |
848 | if (used <= pond->low_threshold) { | |
849 | pond->low_threshold = 0; | |
850 | pond->logged = 0; | |
851 | log_error("Pool threshold reset - shared subnet: %s; " | |
852 | "address: %s; low threshold %d/%d.", | |
853 | shared_name, | |
854 | inet_ntop(AF_INET6, &lease->addr, | |
855 | tmp_addr, sizeof(tmp_addr)), | |
856 | used, count); | |
857 | } | |
858 | return; | |
859 | } | |
860 | ||
861 | /* find the high threshold */ | |
862 | if (get_option_int(&poolhigh, &server_universe, reply->packet, NULL, | |
863 | NULL, reply->packet->options, reply->opt_state, | |
864 | reply->opt_state, &lease->scope, | |
865 | SV_LOG_THRESHOLD_HIGH, MDL) == 0) { | |
866 | /* no threshold bail out */ | |
867 | return; | |
868 | } | |
869 | ||
870 | /* We do have a threshold for this pool, see if its valid */ | |
871 | if ((poolhigh <= 0) || (poolhigh > 100)) { | |
872 | /* not valid */ | |
873 | return; | |
874 | } | |
875 | ||
876 | /* we have a valid value, have we exceeded it */ | |
877 | high_threshold = FIND_PERCENT(count, poolhigh); | |
878 | if (used < high_threshold) { | |
879 | /* nope, no more to do */ | |
880 | return; | |
881 | } | |
882 | ||
883 | /* we've exceeded it, output a message */ | |
884 | if ((pond->shared_network != NULL) && | |
885 | (pond->shared_network->name != NULL)) { | |
886 | shared_name = pond->shared_network->name; | |
887 | } | |
888 | log_error("Pool threshold exceeded - shared subnet: %s; " | |
889 | "address: %s; high threshold %d%% %d/%d.", | |
890 | shared_name, | |
891 | inet_ntop(AF_INET6, &lease->addr, tmp_addr, sizeof(tmp_addr)), | |
892 | poolhigh, used, count); | |
893 | ||
894 | /* handle the low threshold now, if we don't | |
895 | * have one we default to 0. */ | |
896 | if ((get_option_int(&poollow, &server_universe, reply->packet, NULL, | |
897 | NULL, reply->packet->options, reply->opt_state, | |
898 | reply->opt_state, &lease->scope, | |
899 | SV_LOG_THRESHOLD_LOW, MDL) == 0) || | |
900 | (poollow > 100)) { | |
901 | poollow = 0; | |
902 | } | |
903 | ||
904 | /* | |
905 | * If the low theshold is higher than the high threshold we continue to log | |
906 | * If it isn't then we set the flag saying we already logged and determine | |
907 | * what the reset threshold is. | |
908 | */ | |
909 | if (poollow < poolhigh) { | |
910 | pond->logged = 1; | |
911 | pond->low_threshold = FIND_PERCENT(count, poollow); | |
912 | } | |
913 | } | |
914 | ||
98bd7ca0 DH |
915 | /* |
916 | * We have a set of operations we do to set up the reply packet, which | |
917 | * is the same for many message types. | |
918 | */ | |
919 | static int | |
920 | start_reply(struct packet *packet, | |
921 | const struct data_string *client_id, | |
922 | const struct data_string *server_id, | |
923 | struct option_state **opt_state, | |
c382bc98 SK |
924 | struct dhcpv6_packet *reply) |
925 | { | |
98bd7ca0 | 926 | struct option_cache *oc; |
28868515 | 927 | const unsigned char *server_id_data; |
98bd7ca0 DH |
928 | int server_id_len; |
929 | ||
98bd7ca0 DH |
930 | /* |
931 | * Build our option state for reply. | |
932 | */ | |
933 | *opt_state = NULL; | |
934 | if (!option_state_allocate(opt_state, MDL)) { | |
935 | log_error("start_reply: no memory for option_state."); | |
936 | return 0; | |
937 | } | |
5279b8f3 DH |
938 | execute_statements_in_scope(NULL, packet, NULL, NULL, |
939 | packet->options, *opt_state, | |
a7341359 | 940 | &global_scope, root_group, NULL, NULL); |
98bd7ca0 | 941 | |
5279b8f3 DH |
942 | /* |
943 | * A small bit of special handling for Solicit messages. | |
944 | * | |
945 | * We could move the logic into a flag, but for now just check | |
946 | * explicitly. | |
947 | */ | |
948 | if (packet->dhcpv6_msg_type == DHCPV6_SOLICIT) { | |
949 | reply->msg_type = DHCPV6_ADVERTISE; | |
950 | ||
951 | /* | |
952 | * If: | |
953 | * - this message type supports rapid commit (Solicit), and | |
954 | * - the server is configured to supply a rapid commit, and | |
955 | * - the client requests a rapid commit, | |
956 | * Then we add a rapid commit option, and send Reply (instead | |
957 | * of an Advertise). | |
958 | */ | |
959 | oc = lookup_option(&dhcpv6_universe, | |
960 | *opt_state, D6O_RAPID_COMMIT); | |
961 | if (oc != NULL) { | |
962 | oc = lookup_option(&dhcpv6_universe, | |
963 | packet->options, D6O_RAPID_COMMIT); | |
964 | if (oc != NULL) { | |
a8ac02a4 | 965 | /* Rapid-commit in action. */ |
5279b8f3 | 966 | reply->msg_type = DHCPV6_REPLY; |
a8ac02a4 FD |
967 | } else { |
968 | /* Don't want a rapid-commit in advertise. */ | |
969 | delete_option(&dhcpv6_universe, | |
970 | *opt_state, D6O_RAPID_COMMIT); | |
5279b8f3 DH |
971 | } |
972 | } | |
a8ac02a4 | 973 | } else { |
5279b8f3 | 974 | reply->msg_type = DHCPV6_REPLY; |
a8ac02a4 FD |
975 | /* Delete the rapid-commit from the sent options. */ |
976 | oc = lookup_option(&dhcpv6_universe, | |
977 | *opt_state, D6O_RAPID_COMMIT); | |
978 | if (oc != NULL) { | |
979 | delete_option(&dhcpv6_universe, | |
980 | *opt_state, D6O_RAPID_COMMIT); | |
981 | } | |
982 | } | |
5279b8f3 DH |
983 | |
984 | /* | |
985 | * Use the client's transaction identifier for the reply. | |
986 | */ | |
987 | memcpy(reply->transaction_id, packet->dhcpv6_transaction_id, | |
988 | sizeof(reply->transaction_id)); | |
989 | ||
98bd7ca0 DH |
990 | /* |
991 | * RFC 3315, section 18.2 says we need server identifier and | |
992 | * client identifier. | |
993 | * | |
994 | * If the server ID is defined via the configuration file, then | |
995 | * it will already be present in the option state at this point, | |
996 | * so we don't need to set it. | |
997 | * | |
998 | * If we have a server ID passed in from the caller, | |
999 | * use that, otherwise use the global DUID. | |
1000 | */ | |
1001 | oc = lookup_option(&dhcpv6_universe, *opt_state, D6O_SERVERID); | |
1002 | if (oc == NULL) { | |
1003 | if (server_id == NULL) { | |
28868515 | 1004 | server_id_data = server_duid.data; |
98bd7ca0 DH |
1005 | server_id_len = server_duid.len; |
1006 | } else { | |
28868515 | 1007 | server_id_data = server_id->data; |
98bd7ca0 DH |
1008 | server_id_len = server_id->len; |
1009 | } | |
1010 | if (!save_option_buffer(&dhcpv6_universe, *opt_state, | |
28868515 SK |
1011 | NULL, (unsigned char *)server_id_data, |
1012 | server_id_len, D6O_SERVERID, 0)) { | |
98bd7ca0 DH |
1013 | log_error("start_reply: " |
1014 | "error saving server identifier."); | |
1015 | return 0; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | if (client_id->buffer != NULL) { | |
1020 | if (!save_option_buffer(&dhcpv6_universe, *opt_state, | |
1021 | client_id->buffer, | |
1022 | (unsigned char *)client_id->data, | |
1023 | client_id->len, | |
1024 | D6O_CLIENTID, 0)) { | |
1025 | log_error("start_reply: error saving " | |
1026 | "client identifier."); | |
1027 | return 0; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * If the client accepts reconfiguration, let it know that we | |
1033 | * will send them. | |
1034 | * | |
1035 | * Note: we don't actually do this yet, but DOCSIS requires we | |
1036 | * claim to. | |
1037 | */ | |
1038 | oc = lookup_option(&dhcpv6_universe, packet->options, | |
1039 | D6O_RECONF_ACCEPT); | |
1040 | if (oc != NULL) { | |
1041 | if (!save_option_buffer(&dhcpv6_universe, *opt_state, | |
28868515 SK |
1042 | NULL, (unsigned char *)"", 0, |
1043 | D6O_RECONF_ACCEPT, 0)) { | |
98bd7ca0 DH |
1044 | log_error("start_reply: " |
1045 | "error saving RECONF_ACCEPT option."); | |
1046 | option_state_dereference(opt_state, MDL); | |
1047 | return 0; | |
1048 | } | |
1049 | } | |
1050 | ||
98bd7ca0 DH |
1051 | return 1; |
1052 | } | |
1053 | ||
1054 | /* | |
5279b8f3 | 1055 | * Try to get the IPv6 address the client asked for from the |
98bd7ca0 DH |
1056 | * pool. |
1057 | * | |
1058 | * addr is the result (should be a pointer to NULL on entry) | |
1059 | * pool is the pool to search in | |
1060 | * requested_addr is the address the client wants | |
1061 | */ | |
1062 | static isc_result_t | |
1d17db44 | 1063 | try_client_v6_address(struct iasubopt **addr, |
98bd7ca0 | 1064 | struct ipv6_pool *pool, |
c382bc98 SK |
1065 | const struct data_string *requested_addr) |
1066 | { | |
98bd7ca0 DH |
1067 | struct in6_addr tmp_addr; |
1068 | isc_result_t result; | |
98bd7ca0 DH |
1069 | |
1070 | if (requested_addr->len < sizeof(tmp_addr)) { | |
98bf1607 | 1071 | return DHCP_R_INVALIDARG; |
98bd7ca0 DH |
1072 | } |
1073 | memcpy(&tmp_addr, requested_addr->data, sizeof(tmp_addr)); | |
1074 | if (IN6_IS_ADDR_UNSPECIFIED(&tmp_addr)) { | |
1075 | return ISC_R_FAILURE; | |
1076 | } | |
1077 | ||
1aa0fe5e DH |
1078 | /* |
1079 | * The address is not covered by this (or possibly any) dynamic | |
1080 | * range. | |
1081 | */ | |
9322442f | 1082 | if (!ipv6_in_pool(&tmp_addr, pool)) { |
1aa0fe5e | 1083 | return ISC_R_ADDRNOTAVAIL; |
98bd7ca0 DH |
1084 | } |
1085 | ||
1086 | if (lease6_exists(pool, &tmp_addr)) { | |
1087 | return ISC_R_ADDRINUSE; | |
1088 | } | |
1089 | ||
1d17db44 | 1090 | result = iasubopt_allocate(addr, MDL); |
98bd7ca0 DH |
1091 | if (result != ISC_R_SUCCESS) { |
1092 | return result; | |
1093 | } | |
1094 | (*addr)->addr = tmp_addr; | |
9322442f | 1095 | (*addr)->plen = 0; |
98bd7ca0 | 1096 | |
5d89d60f FD |
1097 | /* Default is soft binding for 2 minutes. */ |
1098 | result = add_lease6(pool, *addr, cur_time + 120); | |
98bd7ca0 | 1099 | if (result != ISC_R_SUCCESS) { |
1d17db44 | 1100 | iasubopt_dereference(addr, MDL); |
98bd7ca0 DH |
1101 | } |
1102 | return result; | |
1103 | } | |
1104 | ||
01fa619f SR |
1105 | |
1106 | /*! | |
98bd7ca0 | 1107 | * |
01fa619f SR |
1108 | * \brief Get an IPv6 address for the client. |
1109 | * | |
1110 | * Attempt to find a usable address for the client. We walk through | |
1111 | * the ponds checking for permit and deny then through the pools | |
1112 | * seeing if they have an available address. | |
1113 | * | |
1114 | * \param reply = the state structure for the current work on this request | |
1115 | * if we create a lease we return it using reply->lease | |
1116 | * | |
1117 | * \return | |
1118 | * ISC_R_SUCCESS = we were able to find an address and are returning a | |
1119 | * pointer to the lease | |
1120 | * ISC_R_NORESOURCES = there don't appear to be any free addresses. This | |
1121 | * is probabalistic. We don't exhaustively try the | |
1122 | * address range, instead we hash the duid and if | |
1123 | * the address derived from the hash is in use we | |
1124 | * hash the address. After a number of failures we | |
1125 | * conclude the pool is basically full. | |
98bd7ca0 DH |
1126 | */ |
1127 | static isc_result_t | |
01fa619f | 1128 | pick_v6_address(struct reply_state *reply) |
c382bc98 | 1129 | { |
01fa619f SR |
1130 | struct ipv6_pool *p = NULL; |
1131 | struct ipv6_pond *pond; | |
98bd7ca0 DH |
1132 | int i; |
1133 | int start_pool; | |
28868515 | 1134 | unsigned int attempts; |
1b5053b5 | 1135 | char tmp_buf[INET6_ADDRSTRLEN]; |
01fa619f | 1136 | struct iasubopt **addr = &reply->lease; |
98bd7ca0 | 1137 | |
98bd7ca0 | 1138 | /* |
01fa619f SR |
1139 | * Do a quick walk through of the ponds and pools |
1140 | * to see if we have any NA address pools | |
98bd7ca0 | 1141 | */ |
01fa619f SR |
1142 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { |
1143 | if (pond->ipv6_pools == NULL) | |
1144 | continue; | |
1145 | ||
1146 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { | |
1147 | if (p->pool_type == D6O_IA_NA) | |
1148 | break; | |
80c9fdb0 | 1149 | } |
01fa619f | 1150 | if (p != NULL) |
80c9fdb0 | 1151 | break; |
80c9fdb0 | 1152 | } |
98bd7ca0 | 1153 | |
01fa619f SR |
1154 | /* If we get here and p is NULL we have no useful pools */ |
1155 | if (p == NULL) { | |
1156 | log_debug("Unable to pick client address: " | |
1157 | "no IPv6 pools on this shared network"); | |
1158 | return ISC_R_NORESOURCES; | |
1159 | } | |
1160 | ||
98bd7ca0 | 1161 | /* |
01fa619f SR |
1162 | * We have at least one pool that could provide an address |
1163 | * Now we walk through the ponds and pools again and check | |
1164 | * to see if the client is permitted and if an address is | |
1165 | * available | |
1166 | * | |
1167 | * Within a given pond we start looking at the last pool we | |
1168 | * allocated from, unless it had a collision trying to allocate | |
1169 | * an address. This will tend to move us into less-filled pools. | |
1170 | */ | |
1171 | ||
1172 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
1173 | if (((pond->prohibit_list != NULL) && | |
1174 | (permitted(reply->packet, pond->prohibit_list))) || | |
1175 | ((pond->permit_list != NULL) && | |
1176 | (!permitted(reply->packet, pond->permit_list)))) | |
1177 | continue; | |
1178 | ||
1179 | start_pool = pond->last_ipv6_pool; | |
1180 | i = start_pool; | |
1181 | do { | |
1182 | p = pond->ipv6_pools[i]; | |
1183 | if ((p->pool_type == D6O_IA_NA) && | |
1184 | (create_lease6(p, addr, &attempts, | |
1185 | &reply->ia->iaid_duid, | |
1186 | cur_time + 120) == ISC_R_SUCCESS)) { | |
1187 | /* | |
1188 | * Record the pool used (or next one if there | |
1189 | * was a collision). | |
1190 | */ | |
1191 | if (attempts > 1) { | |
1192 | i++; | |
1193 | if (pond->ipv6_pools[i] == NULL) { | |
1194 | i = 0; | |
1195 | } | |
98bd7ca0 | 1196 | } |
01fa619f | 1197 | pond->last_ipv6_pool = i; |
98bd7ca0 | 1198 | |
01fa619f SR |
1199 | log_debug("Picking pool address %s", |
1200 | inet_ntop(AF_INET6, &((*addr)->addr), | |
1201 | tmp_buf, sizeof(tmp_buf))); | |
1202 | return (ISC_R_SUCCESS); | |
1203 | } | |
98bd7ca0 | 1204 | |
01fa619f SR |
1205 | i++; |
1206 | if (pond->ipv6_pools[i] == NULL) { | |
1207 | i = 0; | |
1208 | } | |
1209 | } while (i != start_pool); | |
1210 | } | |
98bd7ca0 DH |
1211 | |
1212 | /* | |
1213 | * If we failed to pick an IPv6 address from any of the subnets. | |
1214 | * Presumably that means we have no addresses for the client. | |
1215 | */ | |
1b5053b5 | 1216 | log_debug("Unable to pick client address: no addresses available"); |
98bd7ca0 DH |
1217 | return ISC_R_NORESOURCES; |
1218 | } | |
1219 | ||
80c9fdb0 FD |
1220 | /* |
1221 | * Try to get the IPv6 prefix the client asked for from the | |
1222 | * prefix pool. | |
1223 | * | |
1224 | * pref is the result (should be a pointer to NULL on entry) | |
9322442f | 1225 | * pool is the prefix pool to search in |
80c9fdb0 FD |
1226 | * requested_pref is the address the client wants |
1227 | */ | |
1228 | static isc_result_t | |
1d17db44 | 1229 | try_client_v6_prefix(struct iasubopt **pref, |
9322442f | 1230 | struct ipv6_pool *pool, |
80c9fdb0 FD |
1231 | const struct data_string *requested_pref) |
1232 | { | |
1233 | u_int8_t tmp_plen; | |
1234 | struct in6_addr tmp_pref; | |
1235 | struct iaddr ia; | |
1236 | isc_result_t result; | |
1237 | ||
1238 | if (requested_pref->len < sizeof(tmp_plen) + sizeof(tmp_pref)) { | |
98bf1607 | 1239 | return DHCP_R_INVALIDARG; |
80c9fdb0 FD |
1240 | } |
1241 | tmp_plen = (int) requested_pref->data[0]; | |
d19fa5a1 SR |
1242 | if ((tmp_plen < 3) || (tmp_plen > 128) || |
1243 | ((int)tmp_plen != pool->units)) { | |
80c9fdb0 FD |
1244 | return ISC_R_FAILURE; |
1245 | } | |
1246 | memcpy(&tmp_pref, requested_pref->data + 1, sizeof(tmp_pref)); | |
1247 | if (IN6_IS_ADDR_UNSPECIFIED(&tmp_pref)) { | |
1248 | return ISC_R_FAILURE; | |
1249 | } | |
1250 | ia.len = 16; | |
1251 | memcpy(&ia.iabuf, &tmp_pref, 16); | |
1252 | if (!is_cidr_mask_valid(&ia, (int) tmp_plen)) { | |
1253 | return ISC_R_FAILURE; | |
1254 | } | |
1255 | ||
d19fa5a1 SR |
1256 | if (!ipv6_in_pool(&tmp_pref, pool)) { |
1257 | return ISC_R_ADDRNOTAVAIL; | |
80c9fdb0 FD |
1258 | } |
1259 | ||
9322442f | 1260 | if (prefix6_exists(pool, &tmp_pref, tmp_plen)) { |
80c9fdb0 FD |
1261 | return ISC_R_ADDRINUSE; |
1262 | } | |
1263 | ||
1d17db44 | 1264 | result = iasubopt_allocate(pref, MDL); |
80c9fdb0 FD |
1265 | if (result != ISC_R_SUCCESS) { |
1266 | return result; | |
1267 | } | |
9322442f | 1268 | (*pref)->addr = tmp_pref; |
80c9fdb0 FD |
1269 | (*pref)->plen = tmp_plen; |
1270 | ||
5d89d60f | 1271 | /* Default is soft binding for 2 minutes. */ |
9322442f | 1272 | result = add_lease6(pool, *pref, cur_time + 120); |
80c9fdb0 | 1273 | if (result != ISC_R_SUCCESS) { |
1d17db44 | 1274 | iasubopt_dereference(pref, MDL); |
80c9fdb0 FD |
1275 | } |
1276 | return result; | |
1277 | } | |
1278 | ||
01fa619f | 1279 | /*! |
80c9fdb0 | 1280 | * |
01fa619f SR |
1281 | * \brief Get an IPv6 prefix for the client. |
1282 | * | |
1283 | * Attempt to find a usable prefix for the client. We walk through | |
1284 | * the ponds checking for permit and deny then through the pools | |
1285 | * seeing if they have an available prefix. | |
1286 | * | |
1287 | * \param reply = the state structure for the current work on this request | |
1288 | * if we create a lease we return it using reply->lease | |
1289 | * | |
1290 | * \return | |
1291 | * ISC_R_SUCCESS = we were able to find an prefix and are returning a | |
1292 | * pointer to the lease | |
1293 | * ISC_R_NORESOURCES = there don't appear to be any free addresses. This | |
1294 | * is probabalistic. We don't exhaustively try the | |
1295 | * address range, instead we hash the duid and if | |
1296 | * the address derived from the hash is in use we | |
1297 | * hash the address. After a number of failures we | |
1298 | * conclude the pool is basically full. | |
80c9fdb0 | 1299 | */ |
01fa619f | 1300 | |
80c9fdb0 | 1301 | static isc_result_t |
01fa619f | 1302 | pick_v6_prefix(struct reply_state *reply) |
80c9fdb0 | 1303 | { |
01fa619f SR |
1304 | struct ipv6_pool *p = NULL; |
1305 | struct ipv6_pond *pond; | |
80c9fdb0 FD |
1306 | int i; |
1307 | unsigned int attempts; | |
1308 | char tmp_buf[INET6_ADDRSTRLEN]; | |
01fa619f | 1309 | struct iasubopt **pref = &reply->lease; |
80c9fdb0 FD |
1310 | |
1311 | /* | |
01fa619f SR |
1312 | * Do a quick walk through of the ponds and pools |
1313 | * to see if we have any prefix pools | |
80c9fdb0 | 1314 | */ |
01fa619f SR |
1315 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { |
1316 | if (pond->ipv6_pools == NULL) | |
1317 | continue; | |
1318 | ||
1319 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { | |
1320 | if (p->pool_type == D6O_IA_PD) | |
1321 | break; | |
1322 | } | |
1323 | if (p != NULL) | |
1324 | break; | |
1325 | } | |
1326 | ||
1327 | /* If we get here and p is NULL we have no useful pools */ | |
1328 | if (p == NULL) { | |
80c9fdb0 | 1329 | log_debug("Unable to pick client prefix: " |
9322442f | 1330 | "no IPv6 pools on this shared network"); |
80c9fdb0 FD |
1331 | return ISC_R_NORESOURCES; |
1332 | } | |
1333 | ||
1334 | /* | |
01fa619f SR |
1335 | * We have at least one pool that could provide a prefix |
1336 | * Now we walk through the ponds and pools again and check | |
1337 | * to see if the client is permitted and if an prefix is | |
1338 | * available | |
1339 | * | |
1340 | */ | |
1341 | ||
1342 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
1343 | if (((pond->prohibit_list != NULL) && | |
1344 | (permitted(reply->packet, pond->prohibit_list))) || | |
1345 | ((pond->permit_list != NULL) && | |
1346 | (!permitted(reply->packet, pond->permit_list)))) | |
9322442f | 1347 | continue; |
80c9fdb0 | 1348 | |
01fa619f SR |
1349 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { |
1350 | if (p->pool_type != D6O_IA_PD) { | |
1351 | continue; | |
1352 | } | |
80c9fdb0 | 1353 | |
01fa619f SR |
1354 | /* |
1355 | * Try only pools with the requested prefix length if any. | |
1356 | */ | |
1357 | if ((reply->preflen >= 0) && (p->units != reply->preflen)) { | |
1358 | continue; | |
1359 | } | |
1360 | ||
1361 | if (create_prefix6(p, pref, &attempts, &reply->ia->iaid_duid, | |
1362 | cur_time + 120) == ISC_R_SUCCESS) { | |
1363 | log_debug("Picking pool prefix %s/%u", | |
1364 | inet_ntop(AF_INET6, &((*pref)->addr), | |
1365 | tmp_buf, sizeof(tmp_buf)), | |
1366 | (unsigned) (*pref)->plen); | |
1367 | ||
1368 | return (ISC_R_SUCCESS); | |
1369 | } | |
80c9fdb0 FD |
1370 | } |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * If we failed to pick an IPv6 prefix | |
1375 | * Presumably that means we have no prefixes for the client. | |
1376 | */ | |
1377 | log_debug("Unable to pick client prefix: no prefixes available"); | |
1378 | return ISC_R_NORESOURCES; | |
1379 | } | |
1380 | ||
5279b8f3 | 1381 | /* |
cbbd2714 SR |
1382 | *! \file server/dhcpv6.c |
1383 | * | |
1384 | * \brief construct a reply containing information about a client's lease | |
1385 | * | |
5279b8f3 DH |
1386 | * lease_to_client() is called from several messages to construct a |
1387 | * reply that contains all that we know about the client's correct lease | |
1388 | * (or projected lease). | |
1389 | * | |
20ae1aff | 1390 | * Solicit - "Soft" binding, ignore unknown addresses or bindings, just |
5279b8f3 DH |
1391 | * send what we "may" give them on a request. |
1392 | * | |
1393 | * Request - "Hard" binding, but ignore supplied addresses (just provide what | |
1394 | * the client should really use). | |
1395 | * | |
1396 | * Renew - "Hard" binding, but client-supplied addresses are 'real'. Error | |
1397 | * Rebind out any "wrong" addresses the client sends. This means we send | |
1398 | * an empty IA_NA with a status code of NoBinding or NotOnLink or | |
1399 | * possibly send the address with zeroed lifetimes. | |
1400 | * | |
4f963ddc FD |
1401 | * Information-Request - No binding. |
1402 | * | |
5279b8f3 DH |
1403 | * The basic structure is to traverse the client-supplied data first, and |
1404 | * validate and echo back any contents that can be. If the client-supplied | |
1405 | * data does not error out (on renew/rebind as above), but we did not send | |
1406 | * any addresses, attempt to allocate one. | |
cbbd2714 SR |
1407 | * |
1408 | * At the end of the this function we call commit_leases_timed() to | |
1409 | * fsync and rotate the file as necessary. commit_leases_timed() will | |
1410 | * check that we have written at least one lease to the file and that | |
1411 | * some time has passed before doing any fsync or file rewrite so we | |
1412 | * don't bother tracking if we did a write_ia during this function. | |
5279b8f3 | 1413 | */ |
98bd7ca0 | 1414 | /* TODO: look at client hints for lease times */ |
cbbd2714 | 1415 | |
98bd7ca0 DH |
1416 | static void |
1417 | lease_to_client(struct data_string *reply_ret, | |
1418 | struct packet *packet, | |
1419 | const struct data_string *client_id, | |
c382bc98 SK |
1420 | const struct data_string *server_id) |
1421 | { | |
5279b8f3 | 1422 | static struct reply_state reply; |
98bd7ca0 DH |
1423 | struct option_cache *oc; |
1424 | struct data_string packet_oro; | |
01fa619f | 1425 | int i; |
98bd7ca0 | 1426 | |
355db4b6 SR |
1427 | memset(&packet_oro, 0, sizeof(packet_oro)); |
1428 | ||
5279b8f3 | 1429 | /* Locate the client. */ |
bd72740e FD |
1430 | if (shared_network_from_packet6(&reply.shared, |
1431 | packet) != ISC_R_SUCCESS) | |
1432 | goto exit; | |
06eb8bab | 1433 | |
98bd7ca0 | 1434 | /* |
5279b8f3 | 1435 | * Initialize the reply. |
98bd7ca0 | 1436 | */ |
5279b8f3 DH |
1437 | packet_reference(&reply.packet, packet, MDL); |
1438 | data_string_copy(&reply.client_id, client_id, MDL); | |
1439 | ||
1440 | if (!start_reply(packet, client_id, server_id, &reply.opt_state, | |
1441 | &reply.buf.reply)) | |
98bd7ca0 | 1442 | goto exit; |
5279b8f3 DH |
1443 | |
1444 | /* Set the write cursor to just past the reply header. */ | |
1445 | reply.cursor = REPLY_OPTIONS_INDEX; | |
98bd7ca0 DH |
1446 | |
1447 | /* | |
1448 | * Get the ORO from the packet, if any. | |
1449 | */ | |
1450 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_ORO); | |
1451 | if (oc != NULL) { | |
1452 | if (!evaluate_option_cache(&packet_oro, packet, | |
1453 | NULL, NULL, | |
1454 | packet->options, NULL, | |
1455 | &global_scope, oc, MDL)) { | |
1456 | log_error("lease_to_client: error evaluating ORO."); | |
1457 | goto exit; | |
1458 | } | |
1459 | } | |
1460 | ||
5279b8f3 DH |
1461 | /* |
1462 | * Find a host record that matches from the packet, if any, and is | |
1463 | * valid for the shared network the client is on. | |
98bd7ca0 | 1464 | */ |
c900c5b2 | 1465 | if (find_hosts_by_uid(&reply.host, client_id->data, client_id->len, |
01fa619f SR |
1466 | MDL)) { |
1467 | packet->known = 1; | |
bd72740e | 1468 | seek_shared_host(&reply.host, reply.shared); |
01fa619f | 1469 | } |
98bd7ca0 | 1470 | |
5279b8f3 | 1471 | if ((reply.host == NULL) && |
01fa619f SR |
1472 | find_hosts_by_option(&reply.host, packet, packet->options, MDL)) { |
1473 | packet->known = 1; | |
c900c5b2 | 1474 | seek_shared_host(&reply.host, reply.shared); |
01fa619f | 1475 | } |
c900c5b2 DH |
1476 | |
1477 | /* | |
1478 | * Check for 'hardware' matches last, as some of the synthesis methods | |
1479 | * are not considered to be as reliable. | |
1480 | */ | |
1481 | if ((reply.host == NULL) && | |
01fa619f SR |
1482 | find_hosts_by_duid_chaddr(&reply.host, client_id)) { |
1483 | packet->known = 1; | |
bd72740e | 1484 | seek_shared_host(&reply.host, reply.shared); |
01fa619f | 1485 | } |
98bd7ca0 | 1486 | |
80c9fdb0 | 1487 | /* Process the client supplied IA's onto the reply buffer. */ |
5279b8f3 DH |
1488 | reply.ia_count = 0; |
1489 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); | |
d19fa5a1 | 1490 | |
5279b8f3 | 1491 | for (; oc != NULL ; oc = oc->next) { |
9f1d5a2f DH |
1492 | isc_result_t status; |
1493 | ||
1d9774ab FD |
1494 | /* Start counting resources (addresses) offered. */ |
1495 | reply.client_resources = 0; | |
9322442f | 1496 | reply.resources_included = ISC_FALSE; |
9f1d5a2f | 1497 | |
1d9774ab | 1498 | status = reply_process_ia_na(&reply, oc); |
9f1d5a2f DH |
1499 | |
1500 | /* | |
1501 | * We continue to try other IA's whether we can address | |
1502 | * this one or not. Any other result is an immediate fail. | |
1503 | */ | |
1504 | if ((status != ISC_R_SUCCESS) && | |
1505 | (status != ISC_R_NORESOURCES)) | |
5279b8f3 | 1506 | goto exit; |
80c9fdb0 FD |
1507 | } |
1508 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); | |
1509 | for (; oc != NULL ; oc = oc->next) { | |
1510 | isc_result_t status; | |
1511 | ||
80c9fdb0 FD |
1512 | /* Start counting resources (addresses) offered. */ |
1513 | reply.client_resources = 0; | |
9322442f | 1514 | reply.resources_included = ISC_FALSE; |
80c9fdb0 FD |
1515 | |
1516 | status = reply_process_ia_ta(&reply, oc); | |
1517 | ||
1518 | /* | |
1519 | * We continue to try other IA's whether we can address | |
1520 | * this one or not. Any other result is an immediate fail. | |
1521 | */ | |
1522 | if ((status != ISC_R_SUCCESS) && | |
1523 | (status != ISC_R_NORESOURCES)) | |
1524 | goto exit; | |
5279b8f3 DH |
1525 | } |
1526 | ||
80c9fdb0 | 1527 | /* Same for IA_PD's. */ |
9322442f | 1528 | reply.pd_count = 0; |
80c9fdb0 FD |
1529 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); |
1530 | for (; oc != NULL ; oc = oc->next) { | |
1531 | isc_result_t status; | |
1532 | ||
1533 | /* Start counting resources (prefixes) offered. */ | |
1534 | reply.client_resources = 0; | |
9322442f | 1535 | reply.resources_included = ISC_FALSE; |
80c9fdb0 FD |
1536 | |
1537 | status = reply_process_ia_pd(&reply, oc); | |
1538 | ||
1539 | /* | |
1540 | * We continue to try other IA_PD's whether we can address | |
1541 | * this one or not. Any other result is an immediate fail. | |
1542 | */ | |
1543 | if ((status != ISC_R_SUCCESS) && | |
1544 | (status != ISC_R_NORESOURCES)) | |
1545 | goto exit; | |
80c9fdb0 | 1546 | } |
1d9774ab | 1547 | |
5279b8f3 | 1548 | /* |
4f963ddc FD |
1549 | * Make no reply if we gave no resources and is not |
1550 | * for Information-Request. | |
5279b8f3 | 1551 | */ |
7d6180be DH |
1552 | if ((reply.ia_count == 0) && (reply.pd_count == 0)) { |
1553 | if (reply.packet->dhcpv6_msg_type != | |
1554 | DHCPV6_INFORMATION_REQUEST) | |
1555 | goto exit; | |
1556 | ||
1557 | /* | |
1558 | * Because we only execute statements on a per-IA basis, | |
1559 | * we need to execute statements in any non-IA reply to | |
1560 | * source configuration. | |
1561 | */ | |
1562 | execute_statements_in_scope(NULL, reply.packet, NULL, NULL, | |
1563 | reply.packet->options, | |
1564 | reply.opt_state, &global_scope, | |
a7341359 SR |
1565 | reply.shared->group, root_group, |
1566 | NULL); | |
2267da84 | 1567 | |
01fa619f SR |
1568 | /* Execute statements from class scopes. */ |
1569 | for (i = reply.packet->class_count; i > 0; i--) { | |
1570 | execute_statements_in_scope(NULL, reply.packet, | |
1571 | NULL, NULL, | |
1572 | reply.packet->options, | |
1573 | reply.opt_state, | |
1574 | &global_scope, | |
1575 | reply.packet->classes[i - 1]->group, | |
1576 | reply.shared->group, NULL); | |
1577 | } | |
1578 | ||
2267da84 DH |
1579 | /* Bring in any configuration from a host record. */ |
1580 | if (reply.host != NULL) | |
a7341359 SR |
1581 | execute_statements_in_scope(NULL, reply.packet, |
1582 | NULL, NULL, | |
1583 | reply.packet->options, | |
2267da84 DH |
1584 | reply.opt_state, |
1585 | &global_scope, | |
1586 | reply.host->group, | |
a7341359 | 1587 | reply.shared->group, NULL); |
7d6180be | 1588 | } |
98bd7ca0 | 1589 | |
5279b8f3 | 1590 | /* |
9f1d5a2f DH |
1591 | * RFC3315 section 17.2.2 (Solicit): |
1592 | * | |
1593 | * If the server will not assign any addresses to any IAs in a | |
1594 | * subsequent Request from the client, the server MUST send an | |
1595 | * Advertise message to the client that includes only a Status | |
1596 | * Code option with code NoAddrsAvail and a status message for | |
1597 | * the user, a Server Identifier option with the server's DUID, | |
1598 | * and a Client Identifier option with the client's DUID. | |
1599 | * | |
388cba45 SR |
1600 | * This has been updated by an errata such that the server |
1601 | * can always send an IA. | |
1602 | * | |
9f1d5a2f DH |
1603 | * Section 18.2.1 (Request): |
1604 | * | |
1605 | * If the server cannot assign any addresses to an IA in the | |
1606 | * message from the client, the server MUST include the IA in | |
1607 | * the Reply message with no addresses in the IA and a Status | |
1608 | * Code option in the IA containing status code NoAddrsAvail. | |
1609 | * | |
892379ec | 1610 | * Section 18.1.8 (Client Behavior): |
9f1d5a2f | 1611 | * |
892379ec FD |
1612 | * Leave unchanged any information about addresses the client has |
1613 | * recorded in the IA but that were not included in the IA from | |
1614 | * the server. | |
1615 | * Sends a Renew/Rebind if the IA is not in the Reply message. | |
5279b8f3 | 1616 | */ |
9f1d5a2f | 1617 | |
d19fa5a1 SR |
1618 | /* |
1619 | * Having stored the client's IA's, store any options that | |
1620 | * will fit in the remaining space. | |
1621 | */ | |
1622 | reply.cursor += store_options6((char *)reply.buf.data + reply.cursor, | |
1623 | sizeof(reply.buf) - reply.cursor, | |
1624 | reply.opt_state, reply.packet, | |
1625 | required_opts_solicit, | |
1626 | &packet_oro); | |
5279b8f3 DH |
1627 | |
1628 | /* Return our reply to the caller. */ | |
1629 | reply_ret->len = reply.cursor; | |
1630 | reply_ret->buffer = NULL; | |
1631 | if (!buffer_allocate(&reply_ret->buffer, reply.cursor, MDL)) { | |
1632 | log_fatal("No memory to store Reply."); | |
98bd7ca0 | 1633 | } |
5279b8f3 DH |
1634 | memcpy(reply_ret->buffer->data, reply.buf.data, reply.cursor); |
1635 | reply_ret->data = reply_ret->buffer->data; | |
1636 | ||
cbbd2714 SR |
1637 | /* If appropriate commit and rotate the lease file */ |
1638 | (void) commit_leases_timed(); | |
1639 | ||
5279b8f3 DH |
1640 | exit: |
1641 | /* Cleanup. */ | |
1642 | if (reply.shared != NULL) | |
1643 | shared_network_dereference(&reply.shared, MDL); | |
1644 | if (reply.host != NULL) | |
1645 | host_dereference(&reply.host, MDL); | |
1646 | if (reply.opt_state != NULL) | |
1647 | option_state_dereference(&reply.opt_state, MDL); | |
1648 | if (reply.packet != NULL) | |
1649 | packet_dereference(&reply.packet, MDL); | |
1650 | if (reply.client_id.data != NULL) | |
1651 | data_string_forget(&reply.client_id, MDL); | |
3bedb117 SR |
1652 | if (packet_oro.buffer != NULL) |
1653 | data_string_forget(&packet_oro, MDL); | |
5279b8f3 DH |
1654 | reply.renew = reply.rebind = reply.prefer = reply.valid = 0; |
1655 | reply.cursor = 0; | |
1656 | } | |
98bd7ca0 | 1657 | |
b9137d42 | 1658 | /* Process a client-supplied IA_NA. This may append options to the tail of |
5279b8f3 DH |
1659 | * the reply packet being built in the reply_state structure. |
1660 | */ | |
1661 | static isc_result_t | |
1d9774ab | 1662 | reply_process_ia_na(struct reply_state *reply, struct option_cache *ia) { |
5279b8f3 DH |
1663 | isc_result_t status = ISC_R_SUCCESS; |
1664 | u_int32_t iaid; | |
1665 | unsigned ia_cursor; | |
1666 | struct option_state *packet_ia; | |
1667 | struct option_cache *oc; | |
1668 | struct data_string ia_data, data; | |
98bd7ca0 | 1669 | |
5279b8f3 DH |
1670 | /* Initialize values that will get cleaned up on return. */ |
1671 | packet_ia = NULL; | |
1672 | memset(&ia_data, 0, sizeof(ia_data)); | |
1673 | memset(&data, 0, sizeof(data)); | |
b9137d42 SK |
1674 | /* |
1675 | * Note that find_client_address() may set reply->lease. | |
1676 | */ | |
98bd7ca0 | 1677 | |
5279b8f3 DH |
1678 | /* Make sure there is at least room for the header. */ |
1679 | if ((reply->cursor + IA_NA_OFFSET + 4) > sizeof(reply->buf)) { | |
1d9774ab | 1680 | log_error("reply_process_ia_na: Reply too long for IA."); |
5279b8f3 | 1681 | return ISC_R_NOSPACE; |
98bd7ca0 | 1682 | } |
98bd7ca0 | 1683 | |
98bd7ca0 | 1684 | |
5279b8f3 DH |
1685 | /* Fetch the IA_NA contents. */ |
1686 | if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, | |
1687 | ia, IA_NA_OFFSET)) { | |
9322442f | 1688 | log_error("reply_process_ia_na: error evaluating ia"); |
5279b8f3 DH |
1689 | status = ISC_R_FAILURE; |
1690 | goto cleanup; | |
1691 | } | |
98bd7ca0 | 1692 | |
5279b8f3 DH |
1693 | /* Extract IA_NA header contents. */ |
1694 | iaid = getULong(ia_data.data); | |
1695 | reply->renew = getULong(ia_data.data + 4); | |
1696 | reply->rebind = getULong(ia_data.data + 8); | |
1697 | ||
1698 | /* Create an IA_NA structure. */ | |
9322442f FD |
1699 | if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, |
1700 | reply->client_id.len, MDL) != ISC_R_SUCCESS) { | |
1701 | log_error("reply_process_ia_na: no memory for ia."); | |
5279b8f3 DH |
1702 | status = ISC_R_NOMEMORY; |
1703 | goto cleanup; | |
1704 | } | |
9322442f | 1705 | reply->ia->ia_type = D6O_IA_NA; |
5279b8f3 DH |
1706 | |
1707 | /* Cache pre-existing IA, if any. */ | |
9322442f FD |
1708 | ia_hash_lookup(&reply->old_ia, ia_na_active, |
1709 | (unsigned char *)reply->ia->iaid_duid.data, | |
1710 | reply->ia->iaid_duid.len, MDL); | |
5279b8f3 DH |
1711 | |
1712 | /* | |
1713 | * Create an option cache to carry the IA_NA option contents, and | |
1714 | * execute any user-supplied values into it. | |
1715 | */ | |
1716 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
1717 | status = ISC_R_NOMEMORY; | |
1718 | goto cleanup; | |
1719 | } | |
1720 | ||
1721 | /* Check & cache the fixed host record. */ | |
1722 | if ((reply->host != NULL) && (reply->host->fixed_addr != NULL)) { | |
2267da84 DH |
1723 | struct iaddr tmp_addr; |
1724 | ||
5279b8f3 DH |
1725 | if (!evaluate_option_cache(&reply->fixed, NULL, NULL, NULL, |
1726 | NULL, NULL, &global_scope, | |
1727 | reply->host->fixed_addr, MDL)) { | |
1d9774ab | 1728 | log_error("reply_process_ia_na: unable to evaluate " |
5279b8f3 DH |
1729 | "fixed address."); |
1730 | status = ISC_R_FAILURE; | |
1731 | goto cleanup; | |
98bd7ca0 DH |
1732 | } |
1733 | ||
5279b8f3 | 1734 | if (reply->fixed.len < 16) { |
1d9774ab | 1735 | log_error("reply_process_ia_na: invalid fixed address."); |
98bf1607 | 1736 | status = DHCP_R_INVALIDARG; |
5279b8f3 | 1737 | goto cleanup; |
98bd7ca0 DH |
1738 | } |
1739 | ||
2267da84 DH |
1740 | /* Find the static lease's subnet. */ |
1741 | tmp_addr.len = 16; | |
1742 | memcpy(tmp_addr.iabuf, reply->fixed.data, 16); | |
1743 | ||
1744 | if (find_grouped_subnet(&reply->subnet, reply->shared, | |
1745 | tmp_addr, MDL) == 0) | |
1746 | log_fatal("Impossible condition at %s:%d.", MDL); | |
1747 | ||
5279b8f3 DH |
1748 | reply->static_lease = ISC_TRUE; |
1749 | } else | |
1750 | reply->static_lease = ISC_FALSE; | |
1751 | ||
1752 | /* | |
1753 | * Save the cursor position at the start of the IA, so we can | |
1754 | * set length and adjust t1/t2 values later. We write a temporary | |
1755 | * header out now just in case we decide to adjust the packet | |
1756 | * within sub-process functions. | |
1757 | */ | |
1758 | ia_cursor = reply->cursor; | |
1759 | ||
1760 | /* Initialize the IA_NA header. First the code. */ | |
1761 | putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_NA); | |
1762 | reply->cursor += 2; | |
1763 | ||
1764 | /* Then option length. */ | |
1765 | putUShort(reply->buf.data + reply->cursor, 0x0Cu); | |
1766 | reply->cursor += 2; | |
1767 | ||
1768 | /* Then IA_NA header contents; IAID. */ | |
1769 | putULong(reply->buf.data + reply->cursor, iaid); | |
1770 | reply->cursor += 4; | |
1771 | ||
1772 | /* We store the client's t1 for now, and may over-ride it later. */ | |
1773 | putULong(reply->buf.data + reply->cursor, reply->renew); | |
1774 | reply->cursor += 4; | |
1775 | ||
1776 | /* We store the client's t2 for now, and may over-ride it later. */ | |
1777 | putULong(reply->buf.data + reply->cursor, reply->rebind); | |
1778 | reply->cursor += 4; | |
1779 | ||
1780 | /* | |
892379ec FD |
1781 | * For each address in this IA_NA, decide what to do about it. |
1782 | * | |
1783 | * Guidelines: | |
1784 | * | |
7c7515b9 | 1785 | * The client leaves unchanged any information about addresses |
892379ec FD |
1786 | * it has recorded but are not included ("cancel/break" below). |
1787 | * A not included IA ("cleanup" below) could give a Renew/Rebind. | |
5279b8f3 DH |
1788 | */ |
1789 | oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAADDR); | |
1790 | reply->valid = reply->prefer = 0xffffffff; | |
1791 | reply->client_valid = reply->client_prefer = 0; | |
5279b8f3 DH |
1792 | for (; oc != NULL ; oc = oc->next) { |
1793 | status = reply_process_addr(reply, oc); | |
1794 | ||
98bd7ca0 | 1795 | /* |
5279b8f3 DH |
1796 | * Canceled means we did not allocate addresses to the |
1797 | * client, but we're "done" with this IA - we set a status | |
1798 | * code. So transmit this reply, e.g., move on to the next | |
1799 | * IA. | |
98bd7ca0 | 1800 | */ |
5279b8f3 DH |
1801 | if (status == ISC_R_CANCELED) |
1802 | break; | |
98bd7ca0 | 1803 | |
1aa0fe5e DH |
1804 | if ((status != ISC_R_SUCCESS) && |
1805 | (status != ISC_R_ADDRINUSE) && | |
1806 | (status != ISC_R_ADDRNOTAVAIL)) | |
5279b8f3 DH |
1807 | goto cleanup; |
1808 | } | |
1809 | ||
1810 | reply->ia_count++; | |
1811 | ||
1812 | /* | |
1813 | * If we fell through the above and never gave the client | |
1814 | * an address, give it one now. | |
1815 | */ | |
1d9774ab | 1816 | if ((status != ISC_R_CANCELED) && (reply->client_resources == 0)) { |
5279b8f3 DH |
1817 | status = find_client_address(reply); |
1818 | ||
9f1d5a2f DH |
1819 | if (status == ISC_R_NORESOURCES) { |
1820 | switch (reply->packet->dhcpv6_msg_type) { | |
1821 | case DHCPV6_SOLICIT: | |
1822 | /* | |
80c9fdb0 | 1823 | * No address for any IA is handled |
892379ec | 1824 | * by the caller. |
9f1d5a2f | 1825 | */ |
80c9fdb0 | 1826 | /* FALL THROUGH */ |
9f1d5a2f DH |
1827 | |
1828 | case DHCPV6_REQUEST: | |
1829 | /* Section 18.2.1 (Request): | |
1830 | * | |
1831 | * If the server cannot assign any addresses to | |
1832 | * an IA in the message from the client, the | |
1833 | * server MUST include the IA in the Reply | |
1834 | * message with no addresses in the IA and a | |
1835 | * Status Code option in the IA containing | |
1836 | * status code NoAddrsAvail. | |
1837 | */ | |
5279b8f3 DH |
1838 | option_state_dereference(&reply->reply_ia, MDL); |
1839 | if (!option_state_allocate(&reply->reply_ia, | |
9f1d5a2f DH |
1840 | MDL)) |
1841 | { | |
1d9774ab | 1842 | log_error("reply_process_ia_na: No " |
9f1d5a2f DH |
1843 | "memory for option state " |
1844 | "wipe."); | |
5279b8f3 DH |
1845 | status = ISC_R_NOMEMORY; |
1846 | goto cleanup; | |
1847 | } | |
5279b8f3 | 1848 | |
9f1d5a2f DH |
1849 | if (!set_status_code(STATUS_NoAddrsAvail, |
1850 | "No addresses available " | |
1851 | "for this interface.", | |
1852 | reply->reply_ia)) { | |
1d9774ab | 1853 | log_error("reply_process_ia_na: Unable " |
9f1d5a2f DH |
1854 | "to set NoAddrsAvail status " |
1855 | "code."); | |
1856 | status = ISC_R_FAILURE; | |
1857 | goto cleanup; | |
1858 | } | |
5279b8f3 | 1859 | |
9f1d5a2f DH |
1860 | status = ISC_R_SUCCESS; |
1861 | break; | |
1862 | ||
1863 | default: | |
1864 | /* | |
1865 | * RFC 3315 does not tell us to emit a status | |
1866 | * code in this condition, or anything else. | |
1867 | * | |
1868 | * If we included non-allocated addresses | |
1869 | * (zeroed lifetimes) in an IA, then the client | |
1870 | * will deconfigure them. | |
1871 | * | |
1872 | * So we want to include the IA even if we | |
1873 | * can't give it a new address if it includes | |
1874 | * zeroed lifetime addresses. | |
1875 | * | |
1876 | * We don't want to include the IA if we | |
1877 | * provide zero addresses including zeroed | |
892379ec | 1878 | * lifetimes. |
9f1d5a2f | 1879 | */ |
9322442f | 1880 | if (reply->resources_included) |
9f1d5a2f DH |
1881 | status = ISC_R_SUCCESS; |
1882 | else | |
1883 | goto cleanup; | |
1884 | break; | |
1885 | } | |
98bd7ca0 DH |
1886 | } |
1887 | ||
5279b8f3 DH |
1888 | if (status != ISC_R_SUCCESS) |
1889 | goto cleanup; | |
1890 | } | |
1891 | ||
1892 | reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, | |
1893 | sizeof(reply->buf) - reply->cursor, | |
1894 | reply->reply_ia, reply->packet, | |
80c9fdb0 | 1895 | required_opts_IA, NULL); |
5279b8f3 DH |
1896 | |
1897 | /* Reset the length of this IA to match what was just written. */ | |
1898 | putUShort(reply->buf.data + ia_cursor + 2, | |
1899 | reply->cursor - (ia_cursor + 4)); | |
1900 | ||
1901 | /* | |
1902 | * T1/T2 time selection is kind of weird. We actually use DHCP | |
1903 | * (v4) scoped options as handy existing places where these might | |
1904 | * be configured by an administrator. A value of zero tells the | |
1905 | * client it may choose its own renewal time. | |
1906 | */ | |
1907 | reply->renew = 0; | |
1908 | oc = lookup_option(&dhcp_universe, reply->opt_state, | |
1909 | DHO_DHCP_RENEWAL_TIME); | |
1910 | if (oc != NULL) { | |
1911 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
1912 | reply->packet->options, | |
1913 | reply->opt_state, &global_scope, | |
1914 | oc, MDL) || | |
1915 | (data.len != 4)) { | |
1916 | log_error("Invalid renewal time."); | |
1917 | } else { | |
1918 | reply->renew = getULong(data.data); | |
98bd7ca0 DH |
1919 | } |
1920 | ||
5279b8f3 DH |
1921 | if (data.data != NULL) |
1922 | data_string_forget(&data, MDL); | |
1923 | } | |
1924 | putULong(reply->buf.data + ia_cursor + 8, reply->renew); | |
1925 | ||
1926 | /* Now T2. */ | |
1927 | reply->rebind = 0; | |
1928 | oc = lookup_option(&dhcp_universe, reply->opt_state, | |
1929 | DHO_DHCP_REBINDING_TIME); | |
1930 | if (oc != NULL) { | |
1931 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
1932 | reply->packet->options, | |
1933 | reply->opt_state, &global_scope, | |
1934 | oc, MDL) || | |
1935 | (data.len != 4)) { | |
1936 | log_error("Invalid rebinding time."); | |
98bd7ca0 | 1937 | } else { |
5279b8f3 | 1938 | reply->rebind = getULong(data.data); |
98bd7ca0 DH |
1939 | } |
1940 | ||
5279b8f3 DH |
1941 | if (data.data != NULL) |
1942 | data_string_forget(&data, MDL); | |
1943 | } | |
1944 | putULong(reply->buf.data + ia_cursor + 12, reply->rebind); | |
98bd7ca0 | 1945 | |
d9b5c150 SR |
1946 | /* |
1947 | * yes, goto's aren't the best but we also want to avoid extra | |
1948 | * indents | |
1949 | */ | |
1950 | if (status == ISC_R_CANCELED) | |
1951 | goto cleanup; | |
1952 | ||
1953 | /* | |
1954 | * Handle static leases, we always log stuff and if it's | |
1955 | * a hard binding we run any commit statements that we have | |
1956 | */ | |
1957 | if (reply->static_lease) { | |
1958 | char tmp_addr[INET6_ADDRSTRLEN]; | |
1959 | log_info("%s NA: address %s to client with duid %s iaid = %d " | |
1960 | "static", | |
1961 | dhcpv6_type_names[reply->buf.reply.msg_type], | |
1962 | inet_ntop(AF_INET6, reply->fixed.data, tmp_addr, | |
1963 | sizeof(tmp_addr)), | |
1964 | print_hex_1(reply->client_id.len, | |
1965 | reply->client_id.data, 60), | |
1966 | iaid); | |
1967 | ||
1968 | if ((reply->buf.reply.msg_type == DHCPV6_REPLY) && | |
1969 | (reply->on_star.on_commit != NULL)) { | |
1970 | execute_statements(NULL, reply->packet, NULL, NULL, | |
1971 | reply->packet->options, | |
1972 | reply->opt_state, NULL, | |
1973 | reply->on_star.on_commit, NULL); | |
1974 | executable_statement_dereference | |
1975 | (&reply->on_star.on_commit, MDL); | |
1976 | } | |
1977 | goto cleanup; | |
1978 | } | |
1979 | ||
1980 | /* | |
1981 | * If we have any addresses log what we are doing. | |
1982 | */ | |
1983 | if (reply->ia->num_iasubopt != 0) { | |
1984 | struct iasubopt *tmp; | |
1985 | int i; | |
1986 | char tmp_addr[INET6_ADDRSTRLEN]; | |
1987 | ||
1988 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { | |
1989 | tmp = reply->ia->iasubopt[i]; | |
1990 | ||
1991 | log_info("%s NA: address %s to client with duid %s " | |
1992 | "iaid = %d valid for %d seconds", | |
1993 | dhcpv6_type_names[reply->buf.reply.msg_type], | |
1994 | inet_ntop(AF_INET6, &tmp->addr, | |
1995 | tmp_addr, sizeof(tmp_addr)), | |
1996 | print_hex_1(reply->client_id.len, | |
1997 | reply->client_id.data, 60), | |
1998 | iaid, tmp->valid); | |
1999 | } | |
2000 | } | |
2001 | ||
5279b8f3 DH |
2002 | /* |
2003 | * If this is not a 'soft' binding, consume the new changes into | |
2004 | * the database (if any have been attached to the ia_na). | |
2005 | * | |
2006 | * Loop through the assigned dynamic addresses, referencing the | |
2007 | * leases onto this IA_NA rather than any old ones, and updating | |
2008 | * pool timers for each (if any). | |
2009 | */ | |
d9b5c150 SR |
2010 | |
2011 | if ((reply->ia->num_iasubopt != 0) && | |
2012 | (reply->buf.reply.msg_type == DHCPV6_REPLY)) { | |
1d17db44 | 2013 | struct iasubopt *tmp; |
5279b8f3 DH |
2014 | struct data_string *ia_id; |
2015 | int i; | |
98bd7ca0 | 2016 | |
1d17db44 FD |
2017 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { |
2018 | tmp = reply->ia->iasubopt[i]; | |
98bd7ca0 | 2019 | |
9322442f FD |
2020 | if (tmp->ia != NULL) |
2021 | ia_dereference(&tmp->ia, MDL); | |
2022 | ia_reference(&tmp->ia, reply->ia, MDL); | |
98bd7ca0 | 2023 | |
5d89d60f | 2024 | /* Commit 'hard' bindings. */ |
5d89d60f | 2025 | renew_lease6(tmp->ipv6_pool, tmp); |
5279b8f3 | 2026 | schedule_lease_timeout(tmp->ipv6_pool); |
98bd7ca0 | 2027 | |
a7341359 SR |
2028 | /* If we have anything to do on commit do it now */ |
2029 | if (tmp->on_star.on_commit != NULL) { | |
2030 | execute_statements(NULL, reply->packet, | |
2031 | NULL, NULL, | |
2032 | reply->packet->options, | |
2033 | reply->opt_state, | |
58cb5d86 | 2034 | &tmp->scope, |
a7341359 SR |
2035 | tmp->on_star.on_commit, |
2036 | &tmp->on_star); | |
2037 | executable_statement_dereference | |
2038 | (&tmp->on_star.on_commit, MDL); | |
2039 | } | |
2040 | ||
98bf1607 | 2041 | #if defined (NSUPDATE) |
98bd7ca0 | 2042 | /* |
5d89d60f | 2043 | * Perform ddns updates. |
98bd7ca0 | 2044 | */ |
5279b8f3 DH |
2045 | oc = lookup_option(&server_universe, reply->opt_state, |
2046 | SV_DDNS_UPDATES); | |
2047 | if ((oc == NULL) || | |
2048 | evaluate_boolean_option_cache(NULL, reply->packet, | |
2049 | NULL, NULL, | |
2050 | reply->packet->options, | |
2051 | reply->opt_state, | |
bead14ea | 2052 | &tmp->scope, |
5279b8f3 DH |
2053 | oc, MDL)) { |
2054 | ddns_updates(reply->packet, NULL, NULL, | |
bead14ea | 2055 | tmp, NULL, reply->opt_state); |
98bd7ca0 | 2056 | } |
98bf1607 | 2057 | #endif |
250f7134 SR |
2058 | /* Do our threshold check. */ |
2059 | check_pool6_threshold(reply, tmp); | |
5279b8f3 | 2060 | } |
98bd7ca0 | 2061 | |
9322442f | 2062 | /* Remove any old ia from the hash. */ |
80c9fdb0 FD |
2063 | if (reply->old_ia != NULL) { |
2064 | ia_id = &reply->old_ia->iaid_duid; | |
9322442f FD |
2065 | ia_hash_delete(ia_na_active, |
2066 | (unsigned char *)ia_id->data, | |
2067 | ia_id->len, MDL); | |
2068 | ia_dereference(&reply->old_ia, MDL); | |
98bd7ca0 DH |
2069 | } |
2070 | ||
9322442f | 2071 | /* Put new ia into the hash. */ |
1acab09f | 2072 | reply->ia->cltt = cur_time; |
9322442f FD |
2073 | ia_id = &reply->ia->iaid_duid; |
2074 | ia_hash_add(ia_na_active, (unsigned char *)ia_id->data, | |
2075 | ia_id->len, reply->ia, MDL); | |
98bd7ca0 | 2076 | |
9322442f | 2077 | write_ia(reply->ia); |
ad80055f SR |
2078 | } else { |
2079 | schedule_lease_timeout_reply(reply); | |
5279b8f3 | 2080 | } |
98bd7ca0 | 2081 | |
5279b8f3 DH |
2082 | cleanup: |
2083 | if (packet_ia != NULL) | |
2084 | option_state_dereference(&packet_ia, MDL); | |
2085 | if (reply->reply_ia != NULL) | |
2086 | option_state_dereference(&reply->reply_ia, MDL); | |
2087 | if (ia_data.data != NULL) | |
2088 | data_string_forget(&ia_data, MDL); | |
2089 | if (data.data != NULL) | |
2090 | data_string_forget(&data, MDL); | |
9322442f FD |
2091 | if (reply->ia != NULL) |
2092 | ia_dereference(&reply->ia, MDL); | |
80c9fdb0 | 2093 | if (reply->old_ia != NULL) |
9322442f | 2094 | ia_dereference(&reply->old_ia, MDL); |
5d89d60f | 2095 | if (reply->lease != NULL) |
1d17db44 | 2096 | iasubopt_dereference(&reply->lease, MDL); |
5279b8f3 DH |
2097 | if (reply->fixed.data != NULL) |
2098 | data_string_forget(&reply->fixed, MDL); | |
2267da84 DH |
2099 | if (reply->subnet != NULL) |
2100 | subnet_dereference(&reply->subnet, MDL); | |
a7341359 SR |
2101 | if (reply->on_star.on_expiry != NULL) |
2102 | executable_statement_dereference | |
2103 | (&reply->on_star.on_expiry, MDL); | |
2104 | if (reply->on_star.on_release != NULL) | |
2105 | executable_statement_dereference | |
2106 | (&reply->on_star.on_release, MDL); | |
5279b8f3 DH |
2107 | |
2108 | /* | |
2109 | * ISC_R_CANCELED is a status code used by the addr processing to | |
2110 | * indicate we're replying with a status code. This is still a | |
2111 | * success at higher layers. | |
2112 | */ | |
2113 | return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); | |
2114 | } | |
2115 | ||
2116 | /* | |
9322442f | 2117 | * Process an IAADDR within a given IA_xA, storing any IAADDR reply contents |
5279b8f3 DH |
2118 | * into the reply's current ia-scoped option cache. Returns ISC_R_CANCELED |
2119 | * in the event we are replying with a status code and do not wish to process | |
2120 | * more IAADDRs within this IA. | |
2121 | */ | |
2122 | static isc_result_t | |
2123 | reply_process_addr(struct reply_state *reply, struct option_cache *addr) { | |
2124 | u_int32_t pref_life, valid_life; | |
2125 | struct binding_scope **scope; | |
2126 | struct group *group; | |
2127 | struct subnet *subnet; | |
2128 | struct iaddr tmp_addr; | |
b024480e | 2129 | struct option_cache *oc; |
5279b8f3 DH |
2130 | struct data_string iaaddr, data; |
2131 | isc_result_t status = ISC_R_SUCCESS; | |
2132 | ||
2133 | /* Initializes values that will be cleaned up. */ | |
2134 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
2135 | memset(&data, 0, sizeof(data)); | |
2136 | /* Note that reply->lease may be set by address_is_owned() */ | |
2137 | ||
2138 | /* | |
2139 | * There is no point trying to process an incoming address if there | |
2140 | * is no room for an outgoing address. | |
2141 | */ | |
2142 | if ((reply->cursor + 28) > sizeof(reply->buf)) { | |
2143 | log_error("reply_process_addr: Out of room for address."); | |
2144 | return ISC_R_NOSPACE; | |
2145 | } | |
2146 | ||
2147 | /* Extract this IAADDR option. */ | |
2148 | if (!evaluate_option_cache(&iaaddr, reply->packet, NULL, NULL, | |
2149 | reply->packet->options, NULL, &global_scope, | |
2150 | addr, MDL) || | |
2151 | (iaaddr.len < IAADDR_OFFSET)) { | |
2152 | log_error("reply_process_addr: error evaluating IAADDR."); | |
2153 | status = ISC_R_FAILURE; | |
2154 | goto cleanup; | |
2155 | } | |
2156 | ||
bead14ea | 2157 | /* The first 16 bytes are the IPv6 address. */ |
5279b8f3 DH |
2158 | pref_life = getULong(iaaddr.data + 16); |
2159 | valid_life = getULong(iaaddr.data + 20); | |
2160 | ||
2161 | if ((reply->client_valid == 0) || | |
2162 | (reply->client_valid > valid_life)) | |
2163 | reply->client_valid = valid_life; | |
2164 | ||
2165 | if ((reply->client_prefer == 0) || | |
2166 | (reply->client_prefer > pref_life)) | |
2167 | reply->client_prefer = pref_life; | |
2168 | ||
2169 | /* | |
2170 | * Clients may choose to send :: as an address, with the idea to give | |
2171 | * hints about preferred-lifetime or valid-lifetime. | |
2172 | */ | |
bead14ea DH |
2173 | tmp_addr.len = 16; |
2174 | memset(tmp_addr.iabuf, 0, 16); | |
5279b8f3 DH |
2175 | if (!memcmp(iaaddr.data, tmp_addr.iabuf, 16)) { |
2176 | /* Status remains success; we just ignore this one. */ | |
2177 | goto cleanup; | |
2178 | } | |
2179 | ||
bead14ea DH |
2180 | /* tmp_addr len remains 16 */ |
2181 | memcpy(tmp_addr.iabuf, iaaddr.data, 16); | |
2182 | ||
5279b8f3 DH |
2183 | /* |
2184 | * Verify that this address is on the client's network. | |
2185 | */ | |
2186 | for (subnet = reply->shared->subnets ; subnet != NULL ; | |
2187 | subnet = subnet->next_sibling) { | |
2188 | if (addr_eq(subnet_number(tmp_addr, subnet->netmask), | |
2189 | subnet->net)) | |
2190 | break; | |
2191 | } | |
98bd7ca0 | 2192 | |
5279b8f3 DH |
2193 | /* Address not found on shared network. */ |
2194 | if (subnet == NULL) { | |
2195 | /* Ignore this address on 'soft' bindings. */ | |
9322442f FD |
2196 | if (reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) { |
2197 | /* disable rapid commit */ | |
2198 | reply->buf.reply.msg_type = DHCPV6_ADVERTISE; | |
2199 | delete_option(&dhcpv6_universe, | |
2200 | reply->opt_state, | |
2201 | D6O_RAPID_COMMIT); | |
5279b8f3 DH |
2202 | /* status remains success */ |
2203 | goto cleanup; | |
9322442f | 2204 | } |
98bd7ca0 | 2205 | |
5279b8f3 DH |
2206 | /* |
2207 | * RFC3315 section 18.2.1: | |
2208 | * | |
2209 | * If the server finds that the prefix on one or more IP | |
2210 | * addresses in any IA in the message from the client is not | |
2211 | * appropriate for the link to which the client is connected, | |
2212 | * the server MUST return the IA to the client with a Status | |
2213 | * Code option with the value NotOnLink. | |
2214 | */ | |
2215 | if (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) { | |
2216 | /* Rewind the IA_NA to empty. */ | |
2217 | option_state_dereference(&reply->reply_ia, MDL); | |
2218 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
2219 | log_error("reply_process_addr: No memory for " | |
2220 | "option state wipe."); | |
2221 | status = ISC_R_NOMEMORY; | |
2222 | goto cleanup; | |
2223 | } | |
98bd7ca0 | 2224 | |
5279b8f3 DH |
2225 | /* Append a NotOnLink status code. */ |
2226 | if (!set_status_code(STATUS_NotOnLink, | |
2227 | "Address not for use on this " | |
2228 | "link.", reply->reply_ia)) { | |
2229 | log_error("reply_process_addr: Failure " | |
2230 | "setting status code."); | |
2231 | status = ISC_R_FAILURE; | |
2232 | goto cleanup; | |
98bd7ca0 | 2233 | } |
5279b8f3 DH |
2234 | |
2235 | /* Fin (no more IAADDRs). */ | |
2236 | status = ISC_R_CANCELED; | |
2237 | goto cleanup; | |
98bd7ca0 DH |
2238 | } |
2239 | ||
2240 | /* | |
5279b8f3 DH |
2241 | * RFC3315 sections 18.2.3 and 18.2.4 have identical language: |
2242 | * | |
2243 | * If the server finds that any of the addresses are not | |
2244 | * appropriate for the link to which the client is attached, | |
2245 | * the server returns the address to the client with lifetimes | |
2246 | * of 0. | |
98bd7ca0 | 2247 | */ |
5279b8f3 DH |
2248 | if ((reply->packet->dhcpv6_msg_type != DHCPV6_RENEW) && |
2249 | (reply->packet->dhcpv6_msg_type != DHCPV6_REBIND)) { | |
2250 | log_error("It is impossible to lease a client that is " | |
f415516e | 2251 | "not sending a solicit, request, renew, or " |
5279b8f3 DH |
2252 | "rebind."); |
2253 | status = ISC_R_FAILURE; | |
2254 | goto cleanup; | |
98bd7ca0 DH |
2255 | } |
2256 | ||
5279b8f3 DH |
2257 | reply->send_prefer = reply->send_valid = 0; |
2258 | goto send_addr; | |
2259 | } | |
2260 | ||
2261 | /* Verify the address belongs to the client. */ | |
2262 | if (!address_is_owned(reply, &tmp_addr)) { | |
98bd7ca0 | 2263 | /* |
5279b8f3 DH |
2264 | * For solicit and request, any addresses included are |
2265 | * 'requested' addresses. For rebind, we actually have | |
2266 | * no direction on what to do from 3315 section 18.2.4! | |
2267 | * So I think the best bet is to try and give it out, and if | |
2268 | * we can't, zero lifetimes. | |
98bd7ca0 | 2269 | */ |
5279b8f3 DH |
2270 | if ((reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) || |
2271 | (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) || | |
2272 | (reply->packet->dhcpv6_msg_type == DHCPV6_REBIND)) { | |
2273 | status = reply_process_try_addr(reply, &tmp_addr); | |
2274 | ||
1aa0fe5e DH |
2275 | /* |
2276 | * If the address is in use, or isn't in any dynamic | |
2277 | * range, continue as normal. If any other error was | |
2278 | * found, error out. | |
2279 | */ | |
6f76de58 | 2280 | if ((status != ISC_R_SUCCESS) && |
1aa0fe5e DH |
2281 | (status != ISC_R_ADDRINUSE) && |
2282 | (status != ISC_R_ADDRNOTAVAIL)) | |
5279b8f3 DH |
2283 | goto cleanup; |
2284 | ||
1aa0fe5e DH |
2285 | /* |
2286 | * If we didn't honor this lease, for solicit and | |
2287 | * request we simply omit it from our answer. For | |
2288 | * rebind, we send it with zeroed lifetimes. | |
2289 | */ | |
5279b8f3 DH |
2290 | if (reply->lease == NULL) { |
2291 | if (reply->packet->dhcpv6_msg_type == | |
2292 | DHCPV6_REBIND) { | |
2293 | reply->send_prefer = 0; | |
2294 | reply->send_valid = 0; | |
2295 | goto send_addr; | |
2296 | } | |
2297 | ||
2298 | /* status remains success - ignore */ | |
2299 | goto cleanup; | |
98bd7ca0 | 2300 | } |
5279b8f3 DH |
2301 | /* |
2302 | * RFC3315 section 18.2.3: | |
2303 | * | |
2304 | * If the server cannot find a client entry for the IA the | |
2305 | * server returns the IA containing no addresses with a Status | |
2306 | * Code option set to NoBinding in the Reply message. | |
892379ec FD |
2307 | * |
2308 | * On mismatch we (ab)use this pretending we have not the IA | |
2309 | * as soon as we have not an address. | |
5279b8f3 DH |
2310 | */ |
2311 | } else if (reply->packet->dhcpv6_msg_type == DHCPV6_RENEW) { | |
2312 | /* Rewind the IA_NA to empty. */ | |
2313 | option_state_dereference(&reply->reply_ia, MDL); | |
2314 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
2315 | log_error("reply_process_addr: No memory for " | |
2316 | "option state wipe."); | |
2317 | status = ISC_R_NOMEMORY; | |
2318 | goto cleanup; | |
98bd7ca0 | 2319 | } |
98bd7ca0 | 2320 | |
5279b8f3 DH |
2321 | /* Append a NoBinding status code. */ |
2322 | if (!set_status_code(STATUS_NoBinding, | |
2323 | "Address not bound to this " | |
2324 | "interface.", reply->reply_ia)) { | |
2325 | log_error("reply_process_addr: Unable to " | |
2326 | "attach status code."); | |
2327 | status = ISC_R_FAILURE; | |
2328 | goto cleanup; | |
98bd7ca0 | 2329 | } |
5279b8f3 DH |
2330 | |
2331 | /* Fin (no more IAADDRs). */ | |
2332 | status = ISC_R_CANCELED; | |
2333 | goto cleanup; | |
2334 | } else { | |
2335 | log_error("It is impossible to lease a client that is " | |
2336 | "not sending a solicit, request, renew, or " | |
2337 | "rebind message."); | |
2338 | status = ISC_R_FAILURE; | |
2339 | goto cleanup; | |
98bd7ca0 | 2340 | } |
5279b8f3 | 2341 | } |
98bd7ca0 | 2342 | |
5279b8f3 DH |
2343 | if (reply->static_lease) { |
2344 | if (reply->host == NULL) | |
2345 | log_fatal("Impossible condition at %s:%d.", MDL); | |
d9b43370 | 2346 | |
5279b8f3 | 2347 | scope = &global_scope; |
2267da84 | 2348 | group = reply->subnet->group; |
5279b8f3 DH |
2349 | } else { |
2350 | if (reply->lease == NULL) | |
2351 | log_fatal("Impossible condition at %s:%d.", MDL); | |
7285af30 | 2352 | |
5279b8f3 | 2353 | scope = &reply->lease->scope; |
01fa619f | 2354 | group = reply->lease->ipv6_pool->ipv6_pond->group; |
5279b8f3 | 2355 | } |
98bd7ca0 | 2356 | |
b024480e | 2357 | /* |
1d9774ab | 2358 | * If client_resources is nonzero, then the reply_process_is_addressed |
b024480e DH |
2359 | * function has executed configuration state into the reply option |
2360 | * cache. We will use that valid cache to derive configuration for | |
2361 | * whether or not to engage in additional addresses, and similar. | |
2362 | */ | |
1d9774ab | 2363 | if (reply->client_resources != 0) { |
b024480e DH |
2364 | unsigned limit = 1; |
2365 | ||
2366 | /* | |
2367 | * Does this client have "enough" addresses already? Default | |
2368 | * to one. Everybody gets one, and one should be enough for | |
2369 | * anybody. | |
2370 | */ | |
2371 | oc = lookup_option(&server_universe, reply->opt_state, | |
2372 | SV_LIMIT_ADDRS_PER_IA); | |
2373 | if (oc != NULL) { | |
2374 | if (!evaluate_option_cache(&data, reply->packet, | |
2375 | NULL, NULL, | |
2376 | reply->packet->options, | |
2377 | reply->opt_state, | |
2378 | scope, oc, MDL) || | |
2379 | (data.len != 4)) { | |
1d9774ab | 2380 | log_error("reply_process_addr: unable to " |
b024480e DH |
2381 | "evaluate addrs-per-ia value."); |
2382 | status = ISC_R_FAILURE; | |
2383 | goto cleanup; | |
2384 | } | |
2385 | ||
2386 | limit = getULong(data.data); | |
2387 | data_string_forget(&data, MDL); | |
2388 | } | |
2389 | ||
2390 | /* | |
2391 | * If we wish to limit the client to a certain number of | |
2392 | * addresses, then omit the address from the reply. | |
2393 | */ | |
1d9774ab | 2394 | if (reply->client_resources >= limit) |
b024480e DH |
2395 | goto cleanup; |
2396 | } | |
2397 | ||
9322442f | 2398 | status = reply_process_is_addressed(reply, scope, group); |
5279b8f3 DH |
2399 | if (status != ISC_R_SUCCESS) |
2400 | goto cleanup; | |
98bd7ca0 | 2401 | |
5279b8f3 DH |
2402 | send_addr: |
2403 | status = reply_process_send_addr(reply, &tmp_addr); | |
98bd7ca0 | 2404 | |
5279b8f3 DH |
2405 | cleanup: |
2406 | if (iaaddr.data != NULL) | |
2407 | data_string_forget(&iaaddr, MDL); | |
2408 | if (data.data != NULL) | |
2409 | data_string_forget(&data, MDL); | |
2410 | if (reply->lease != NULL) | |
1d17db44 | 2411 | iasubopt_dereference(&reply->lease, MDL); |
98bd7ca0 | 2412 | |
5279b8f3 DH |
2413 | return status; |
2414 | } | |
98bd7ca0 | 2415 | |
5279b8f3 DH |
2416 | /* |
2417 | * Verify the address belongs to the client. If we've got a host | |
2418 | * record with a fixed address, it has to be the assigned address | |
2419 | * (fault out all else). Otherwise it's a dynamic address, so lookup | |
2420 | * that address and make sure it belongs to this DUID:IAID pair. | |
2421 | */ | |
2422 | static isc_boolean_t | |
2423 | address_is_owned(struct reply_state *reply, struct iaddr *addr) { | |
2424 | int i; | |
01fa619f | 2425 | struct ipv6_pond *pond; |
98bd7ca0 | 2426 | |
5279b8f3 DH |
2427 | /* |
2428 | * This faults out addresses that don't match fixed addresses. | |
2429 | */ | |
2430 | if (reply->static_lease) { | |
2431 | if (reply->fixed.data == NULL) | |
2432 | log_fatal("Impossible condition at %s:%d.", MDL); | |
98bd7ca0 | 2433 | |
5279b8f3 | 2434 | if (memcmp(addr->iabuf, reply->fixed.data, 16) == 0) |
bc7f8b8e | 2435 | return (ISC_TRUE); |
98bd7ca0 | 2436 | |
bc7f8b8e | 2437 | return (ISC_FALSE); |
5279b8f3 DH |
2438 | } |
2439 | ||
1d17db44 | 2440 | if ((reply->old_ia == NULL) || (reply->old_ia->num_iasubopt == 0)) |
bc7f8b8e | 2441 | return (ISC_FALSE); |
5279b8f3 | 2442 | |
1d17db44 FD |
2443 | for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { |
2444 | struct iasubopt *tmp; | |
5279b8f3 | 2445 | |
1d17db44 | 2446 | tmp = reply->old_ia->iasubopt[i]; |
5279b8f3 DH |
2447 | |
2448 | if (memcmp(addr->iabuf, &tmp->addr, 16) == 0) { | |
bc7f8b8e SR |
2449 | if (lease6_usable(tmp) == ISC_FALSE) { |
2450 | return (ISC_FALSE); | |
2451 | } | |
01fa619f SR |
2452 | |
2453 | pond = tmp->ipv6_pool->ipv6_pond; | |
2454 | if (((pond->prohibit_list != NULL) && | |
2455 | (permitted(reply->packet, pond->prohibit_list))) || | |
2456 | ((pond->permit_list != NULL) && | |
2457 | (!permitted(reply->packet, pond->permit_list)))) | |
2458 | return (ISC_FALSE); | |
2459 | ||
1d17db44 | 2460 | iasubopt_reference(&reply->lease, tmp, MDL); |
01fa619f | 2461 | |
bc7f8b8e | 2462 | return (ISC_TRUE); |
98bd7ca0 | 2463 | } |
98bd7ca0 DH |
2464 | } |
2465 | ||
bc7f8b8e | 2466 | return (ISC_FALSE); |
5279b8f3 DH |
2467 | } |
2468 | ||
80c9fdb0 FD |
2469 | /* Process a client-supplied IA_TA. This may append options to the tail of |
2470 | * the reply packet being built in the reply_state structure. | |
5279b8f3 DH |
2471 | */ |
2472 | static isc_result_t | |
80c9fdb0 FD |
2473 | reply_process_ia_ta(struct reply_state *reply, struct option_cache *ia) { |
2474 | isc_result_t status = ISC_R_SUCCESS; | |
2475 | u_int32_t iaid; | |
2476 | unsigned ia_cursor; | |
2477 | struct option_state *packet_ia; | |
2478 | struct option_cache *oc; | |
2479 | struct data_string ia_data, data; | |
2480 | struct data_string iaaddr; | |
2481 | u_int32_t pref_life, valid_life; | |
783259b1 | 2482 | struct iaddr tmp_addr; |
5279b8f3 | 2483 | |
80c9fdb0 FD |
2484 | /* Initialize values that will get cleaned up on return. */ |
2485 | packet_ia = NULL; | |
2486 | memset(&ia_data, 0, sizeof(ia_data)); | |
2487 | memset(&data, 0, sizeof(data)); | |
2488 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
5279b8f3 | 2489 | |
80c9fdb0 FD |
2490 | /* Make sure there is at least room for the header. */ |
2491 | if ((reply->cursor + IA_TA_OFFSET + 4) > sizeof(reply->buf)) { | |
2492 | log_error("reply_process_ia_ta: Reply too long for IA."); | |
2493 | return ISC_R_NOSPACE; | |
98bd7ca0 | 2494 | } |
98bd7ca0 | 2495 | |
5279b8f3 | 2496 | |
80c9fdb0 FD |
2497 | /* Fetch the IA_TA contents. */ |
2498 | if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, | |
2499 | ia, IA_TA_OFFSET)) { | |
9322442f | 2500 | log_error("reply_process_ia_ta: error evaluating ia"); |
80c9fdb0 FD |
2501 | status = ISC_R_FAILURE; |
2502 | goto cleanup; | |
98bd7ca0 | 2503 | } |
5279b8f3 | 2504 | |
80c9fdb0 FD |
2505 | /* Extract IA_TA header contents. */ |
2506 | iaid = getULong(ia_data.data); | |
5279b8f3 | 2507 | |
80c9fdb0 | 2508 | /* Create an IA_TA structure. */ |
783259b1 | 2509 | if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, |
9322442f FD |
2510 | reply->client_id.len, MDL) != ISC_R_SUCCESS) { |
2511 | log_error("reply_process_ia_ta: no memory for ia."); | |
80c9fdb0 FD |
2512 | status = ISC_R_NOMEMORY; |
2513 | goto cleanup; | |
98bd7ca0 | 2514 | } |
9322442f | 2515 | reply->ia->ia_type = D6O_IA_TA; |
5279b8f3 | 2516 | |
80c9fdb0 | 2517 | /* Cache pre-existing IA, if any. */ |
9322442f FD |
2518 | ia_hash_lookup(&reply->old_ia, ia_ta_active, |
2519 | (unsigned char *)reply->ia->iaid_duid.data, | |
2520 | reply->ia->iaid_duid.len, MDL); | |
80c9fdb0 FD |
2521 | |
2522 | /* | |
2523 | * Create an option cache to carry the IA_TA option contents, and | |
2524 | * execute any user-supplied values into it. | |
5279b8f3 | 2525 | */ |
80c9fdb0 FD |
2526 | if (!option_state_allocate(&reply->reply_ia, MDL)) { |
2527 | status = ISC_R_NOMEMORY; | |
2528 | goto cleanup; | |
98bd7ca0 | 2529 | } |
5279b8f3 | 2530 | |
80c9fdb0 FD |
2531 | /* |
2532 | * Temporary leases are dynamic by definition. | |
2533 | */ | |
2534 | reply->static_lease = ISC_FALSE; | |
5279b8f3 | 2535 | |
80c9fdb0 FD |
2536 | /* |
2537 | * Save the cursor position at the start of the IA, so we can | |
2538 | * set length later. We write a temporary | |
2539 | * header out now just in case we decide to adjust the packet | |
2540 | * within sub-process functions. | |
2541 | */ | |
2542 | ia_cursor = reply->cursor; | |
2543 | ||
2544 | /* Initialize the IA_TA header. First the code. */ | |
2545 | putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_TA); | |
2546 | reply->cursor += 2; | |
2547 | ||
2548 | /* Then option length. */ | |
2549 | putUShort(reply->buf.data + reply->cursor, 0x04u); | |
2550 | reply->cursor += 2; | |
2551 | ||
2552 | /* Then IA_TA header contents; IAID. */ | |
2553 | putULong(reply->buf.data + reply->cursor, iaid); | |
2554 | reply->cursor += 4; | |
2555 | ||
2556 | /* | |
2557 | * Deal with an IAADDR for lifetimes. | |
783259b1 | 2558 | * For all or none, process IAADDRs as hints. |
80c9fdb0 FD |
2559 | */ |
2560 | reply->valid = reply->prefer = 0xffffffff; | |
2561 | reply->client_valid = reply->client_prefer = 0; | |
2562 | oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAADDR); | |
783259b1 FD |
2563 | for (; oc != NULL; oc = oc->next) { |
2564 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
80c9fdb0 FD |
2565 | if (!evaluate_option_cache(&iaaddr, reply->packet, |
2566 | NULL, NULL, | |
2567 | reply->packet->options, NULL, | |
2568 | &global_scope, oc, MDL) || | |
2569 | (iaaddr.len < IAADDR_OFFSET)) { | |
2570 | log_error("reply_process_ia_ta: error " | |
2571 | "evaluating IAADDR."); | |
2572 | status = ISC_R_FAILURE; | |
2573 | goto cleanup; | |
2574 | } | |
2575 | /* The first 16 bytes are the IPv6 address. */ | |
2576 | pref_life = getULong(iaaddr.data + 16); | |
2577 | valid_life = getULong(iaaddr.data + 20); | |
2578 | ||
2579 | if ((reply->client_valid == 0) || | |
2580 | (reply->client_valid > valid_life)) | |
2581 | reply->client_valid = valid_life; | |
2582 | ||
2583 | if ((reply->client_prefer == 0) || | |
2584 | (reply->client_prefer > pref_life)) | |
2585 | reply->client_prefer = pref_life; | |
80c9fdb0 | 2586 | |
783259b1 FD |
2587 | /* Nothing more if something has failed. */ |
2588 | if (status == ISC_R_CANCELED) | |
2589 | continue; | |
2590 | ||
2591 | tmp_addr.len = 16; | |
2592 | memcpy(tmp_addr.iabuf, iaaddr.data, 16); | |
2593 | if (!temporary_is_available(reply, &tmp_addr)) | |
2594 | goto bad_temp; | |
2595 | status = reply_process_is_addressed(reply, | |
2596 | &reply->lease->scope, | |
01fa619f | 2597 | reply->lease->ipv6_pool->ipv6_pond->group); |
783259b1 FD |
2598 | if (status != ISC_R_SUCCESS) |
2599 | goto bad_temp; | |
2600 | status = reply_process_send_addr(reply, &tmp_addr); | |
2601 | if (status != ISC_R_SUCCESS) | |
2602 | goto bad_temp; | |
2603 | if (reply->lease != NULL) | |
2604 | iasubopt_dereference(&reply->lease, MDL); | |
2605 | continue; | |
2606 | ||
2607 | bad_temp: | |
2608 | /* Rewind the IA_TA to empty. */ | |
2609 | option_state_dereference(&reply->reply_ia, MDL); | |
2610 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
2611 | status = ISC_R_NOMEMORY; | |
80c9fdb0 FD |
2612 | goto cleanup; |
2613 | } | |
2614 | status = ISC_R_CANCELED; | |
783259b1 FD |
2615 | reply->client_resources = 0; |
2616 | reply->resources_included = ISC_FALSE; | |
2617 | if (reply->lease != NULL) | |
2618 | iasubopt_dereference(&reply->lease, MDL); | |
80c9fdb0 | 2619 | } |
783259b1 | 2620 | reply->ia_count++; |
80c9fdb0 FD |
2621 | |
2622 | /* | |
2623 | * Give the client temporary addresses. | |
2624 | */ | |
783259b1 FD |
2625 | if (reply->client_resources != 0) |
2626 | goto store; | |
80c9fdb0 FD |
2627 | status = find_client_temporaries(reply); |
2628 | if (status == ISC_R_NORESOURCES) { | |
2629 | switch (reply->packet->dhcpv6_msg_type) { | |
2630 | case DHCPV6_SOLICIT: | |
2631 | /* | |
2632 | * No address for any IA is handled | |
2633 | * by the caller. | |
2634 | */ | |
2635 | /* FALL THROUGH */ | |
2636 | ||
2637 | case DHCPV6_REQUEST: | |
2638 | /* Section 18.2.1 (Request): | |
2639 | * | |
2640 | * If the server cannot assign any addresses to | |
2641 | * an IA in the message from the client, the | |
2642 | * server MUST include the IA in the Reply | |
2643 | * message with no addresses in the IA and a | |
2644 | * Status Code option in the IA containing | |
2645 | * status code NoAddrsAvail. | |
2646 | */ | |
2647 | option_state_dereference(&reply->reply_ia, MDL); | |
2648 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
2649 | log_error("reply_process_ia_ta: No " | |
2650 | "memory for option state wipe."); | |
2651 | status = ISC_R_NOMEMORY; | |
2652 | goto cleanup; | |
2653 | } | |
2654 | ||
2655 | if (!set_status_code(STATUS_NoAddrsAvail, | |
2656 | "No addresses available " | |
2657 | "for this interface.", | |
2658 | reply->reply_ia)) { | |
2659 | log_error("reply_process_ia_ta: Unable " | |
2660 | "to set NoAddrsAvail status code."); | |
2661 | status = ISC_R_FAILURE; | |
2662 | goto cleanup; | |
2663 | } | |
2664 | ||
2665 | status = ISC_R_SUCCESS; | |
2666 | break; | |
2667 | ||
2668 | default: | |
783259b1 FD |
2669 | /* |
2670 | * We don't want to include the IA if we | |
2671 | * provide zero addresses including zeroed | |
2672 | * lifetimes. | |
2673 | */ | |
2674 | if (reply->resources_included) | |
2675 | status = ISC_R_SUCCESS; | |
2676 | else | |
2677 | goto cleanup; | |
2678 | break; | |
80c9fdb0 FD |
2679 | } |
2680 | } else if (status != ISC_R_SUCCESS) | |
2681 | goto cleanup; | |
2682 | ||
2683 | store: | |
2684 | reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, | |
2685 | sizeof(reply->buf) - reply->cursor, | |
2686 | reply->reply_ia, reply->packet, | |
2687 | required_opts_IA, NULL); | |
2688 | ||
2689 | /* Reset the length of this IA to match what was just written. */ | |
2690 | putUShort(reply->buf.data + ia_cursor + 2, | |
2691 | reply->cursor - (ia_cursor + 4)); | |
2692 | ||
2693 | /* | |
d9b5c150 SR |
2694 | * yes, goto's aren't the best but we also want to avoid extra |
2695 | * indents | |
2696 | */ | |
2697 | if (status == ISC_R_CANCELED) | |
2698 | goto cleanup; | |
2699 | ||
2700 | /* | |
2701 | * If we have any addresses log what we are doing. | |
2702 | */ | |
2703 | if (reply->ia->num_iasubopt != 0) { | |
2704 | struct iasubopt *tmp; | |
2705 | int i; | |
2706 | char tmp_addr[INET6_ADDRSTRLEN]; | |
2707 | ||
2708 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { | |
2709 | tmp = reply->ia->iasubopt[i]; | |
2710 | ||
2711 | log_info("%s TA: address %s to client with duid %s " | |
2712 | "iaid = %d valid for %d seconds", | |
2713 | dhcpv6_type_names[reply->buf.reply.msg_type], | |
2714 | inet_ntop(AF_INET6, &tmp->addr, | |
2715 | tmp_addr, sizeof(tmp_addr)), | |
2716 | print_hex_1(reply->client_id.len, | |
2717 | reply->client_id.data, 60), | |
2718 | iaid, | |
2719 | tmp->valid); | |
2720 | } | |
2721 | } | |
2722 | ||
2723 | /* | |
2724 | * For hard bindings we consume the new changes into | |
2725 | * the database (if any have been attached to the ia_ta). | |
80c9fdb0 FD |
2726 | * |
2727 | * Loop through the assigned dynamic addresses, referencing the | |
2728 | * leases onto this IA_TA rather than any old ones, and updating | |
2729 | * pool timers for each (if any). | |
2730 | */ | |
d9b5c150 SR |
2731 | if ((reply->ia->num_iasubopt != 0) && |
2732 | (reply->buf.reply.msg_type == DHCPV6_REPLY)) { | |
1d17db44 | 2733 | struct iasubopt *tmp; |
80c9fdb0 FD |
2734 | struct data_string *ia_id; |
2735 | int i; | |
2736 | ||
1d17db44 FD |
2737 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { |
2738 | tmp = reply->ia->iasubopt[i]; | |
80c9fdb0 | 2739 | |
9322442f FD |
2740 | if (tmp->ia != NULL) |
2741 | ia_dereference(&tmp->ia, MDL); | |
2742 | ia_reference(&tmp->ia, reply->ia, MDL); | |
80c9fdb0 | 2743 | |
5d89d60f | 2744 | /* Commit 'hard' bindings. */ |
5d89d60f | 2745 | renew_lease6(tmp->ipv6_pool, tmp); |
80c9fdb0 FD |
2746 | schedule_lease_timeout(tmp->ipv6_pool); |
2747 | ||
a7341359 SR |
2748 | /* If we have anything to do on commit do it now */ |
2749 | if (tmp->on_star.on_commit != NULL) { | |
2750 | execute_statements(NULL, reply->packet, | |
2751 | NULL, NULL, | |
2752 | reply->packet->options, | |
2753 | reply->opt_state, | |
58cb5d86 | 2754 | &tmp->scope, |
a7341359 SR |
2755 | tmp->on_star.on_commit, |
2756 | &tmp->on_star); | |
2757 | executable_statement_dereference | |
2758 | (&tmp->on_star.on_commit, MDL); | |
2759 | } | |
2760 | ||
98bf1607 | 2761 | #if defined (NSUPDATE) |
80c9fdb0 FD |
2762 | /* |
2763 | * Perform ddns updates. | |
2764 | */ | |
2765 | oc = lookup_option(&server_universe, reply->opt_state, | |
2766 | SV_DDNS_UPDATES); | |
2767 | if ((oc == NULL) || | |
2768 | evaluate_boolean_option_cache(NULL, reply->packet, | |
2769 | NULL, NULL, | |
2770 | reply->packet->options, | |
2771 | reply->opt_state, | |
2772 | &tmp->scope, | |
2773 | oc, MDL)) { | |
2774 | ddns_updates(reply->packet, NULL, NULL, | |
2775 | tmp, NULL, reply->opt_state); | |
2776 | } | |
98bf1607 | 2777 | #endif |
250f7134 SR |
2778 | /* Do our threshold check. */ |
2779 | check_pool6_threshold(reply, tmp); | |
80c9fdb0 FD |
2780 | } |
2781 | ||
9322442f | 2782 | /* Remove any old ia from the hash. */ |
80c9fdb0 FD |
2783 | if (reply->old_ia != NULL) { |
2784 | ia_id = &reply->old_ia->iaid_duid; | |
9322442f FD |
2785 | ia_hash_delete(ia_ta_active, |
2786 | (unsigned char *)ia_id->data, | |
2787 | ia_id->len, MDL); | |
2788 | ia_dereference(&reply->old_ia, MDL); | |
80c9fdb0 FD |
2789 | } |
2790 | ||
9322442f | 2791 | /* Put new ia into the hash. */ |
1acab09f | 2792 | reply->ia->cltt = cur_time; |
9322442f FD |
2793 | ia_id = &reply->ia->iaid_duid; |
2794 | ia_hash_add(ia_ta_active, (unsigned char *)ia_id->data, | |
2795 | ia_id->len, reply->ia, MDL); | |
80c9fdb0 | 2796 | |
9322442f | 2797 | write_ia(reply->ia); |
ad80055f SR |
2798 | } else { |
2799 | schedule_lease_timeout_reply(reply); | |
80c9fdb0 FD |
2800 | } |
2801 | ||
2802 | cleanup: | |
2803 | if (packet_ia != NULL) | |
2804 | option_state_dereference(&packet_ia, MDL); | |
2805 | if (iaaddr.data != NULL) | |
2806 | data_string_forget(&iaaddr, MDL); | |
2807 | if (reply->reply_ia != NULL) | |
2808 | option_state_dereference(&reply->reply_ia, MDL); | |
2809 | if (ia_data.data != NULL) | |
2810 | data_string_forget(&ia_data, MDL); | |
2811 | if (data.data != NULL) | |
2812 | data_string_forget(&data, MDL); | |
9322442f FD |
2813 | if (reply->ia != NULL) |
2814 | ia_dereference(&reply->ia, MDL); | |
80c9fdb0 | 2815 | if (reply->old_ia != NULL) |
9322442f | 2816 | ia_dereference(&reply->old_ia, MDL); |
5d89d60f | 2817 | if (reply->lease != NULL) |
1d17db44 | 2818 | iasubopt_dereference(&reply->lease, MDL); |
80c9fdb0 FD |
2819 | |
2820 | /* | |
2821 | * ISC_R_CANCELED is a status code used by the addr processing to | |
783259b1 | 2822 | * indicate we're replying with other addresses. This is still a |
80c9fdb0 FD |
2823 | * success at higher layers. |
2824 | */ | |
2825 | return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); | |
2826 | } | |
2827 | ||
783259b1 FD |
2828 | /* |
2829 | * Verify the temporary address is available. | |
2830 | */ | |
2831 | static isc_boolean_t | |
2832 | temporary_is_available(struct reply_state *reply, struct iaddr *addr) { | |
2833 | struct in6_addr tmp_addr; | |
2834 | struct subnet *subnet; | |
01fa619f SR |
2835 | struct ipv6_pool *pool = NULL; |
2836 | struct ipv6_pond *pond = NULL; | |
783259b1 FD |
2837 | int i; |
2838 | ||
2839 | memcpy(&tmp_addr, addr->iabuf, sizeof(tmp_addr)); | |
2840 | /* | |
2841 | * Clients may choose to send :: as an address, with the idea to give | |
2842 | * hints about preferred-lifetime or valid-lifetime. | |
2843 | * So this is not a request for this address. | |
2844 | */ | |
2845 | if (IN6_IS_ADDR_UNSPECIFIED(&tmp_addr)) | |
2846 | return ISC_FALSE; | |
2847 | ||
2848 | /* | |
2849 | * Verify that this address is on the client's network. | |
2850 | */ | |
2851 | for (subnet = reply->shared->subnets ; subnet != NULL ; | |
2852 | subnet = subnet->next_sibling) { | |
2853 | if (addr_eq(subnet_number(*addr, subnet->netmask), | |
2854 | subnet->net)) | |
2855 | break; | |
2856 | } | |
2857 | ||
2858 | /* Address not found on shared network. */ | |
2859 | if (subnet == NULL) | |
2860 | return ISC_FALSE; | |
2861 | ||
2862 | /* | |
2863 | * Check if this address is owned (must be before next step). | |
2864 | */ | |
2865 | if (address_is_owned(reply, addr)) | |
2866 | return ISC_TRUE; | |
2867 | ||
2868 | /* | |
2869 | * Verify that this address is in a temporary pool and try to get it. | |
2870 | */ | |
01fa619f SR |
2871 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { |
2872 | if (((pond->prohibit_list != NULL) && | |
2873 | (permitted(reply->packet, pond->prohibit_list))) || | |
2874 | ((pond->permit_list != NULL) && | |
2875 | (!permitted(reply->packet, pond->permit_list)))) | |
783259b1 | 2876 | continue; |
01fa619f SR |
2877 | |
2878 | for (i = 0 ; (pool = pond->ipv6_pools[i]) != NULL ; i++) { | |
2879 | if (pool->pool_type != D6O_IA_TA) | |
2880 | continue; | |
2881 | ||
2882 | if (ipv6_in_pool(&tmp_addr, pool)) | |
2883 | break; | |
2884 | } | |
2885 | ||
2886 | if (pool != NULL) | |
783259b1 FD |
2887 | break; |
2888 | } | |
01fa619f | 2889 | |
783259b1 FD |
2890 | if (pool == NULL) |
2891 | return ISC_FALSE; | |
2892 | if (lease6_exists(pool, &tmp_addr)) | |
2893 | return ISC_FALSE; | |
2894 | if (iasubopt_allocate(&reply->lease, MDL) != ISC_R_SUCCESS) | |
2895 | return ISC_FALSE; | |
2896 | reply->lease->addr = tmp_addr; | |
2897 | reply->lease->plen = 0; | |
2898 | /* Default is soft binding for 2 minutes. */ | |
2899 | if (add_lease6(pool, reply->lease, cur_time + 120) != ISC_R_SUCCESS) | |
2900 | return ISC_FALSE; | |
2901 | ||
2902 | return ISC_TRUE; | |
2903 | } | |
2904 | ||
80c9fdb0 FD |
2905 | /* |
2906 | * Get a temporary address per prefix. | |
2907 | */ | |
2908 | static isc_result_t | |
2909 | find_client_temporaries(struct reply_state *reply) { | |
80c9fdb0 | 2910 | int i; |
f1ef85cf | 2911 | struct ipv6_pool *p = NULL; |
01fa619f SR |
2912 | struct ipv6_pond *pond; |
2913 | isc_result_t status = ISC_R_NORESOURCES;; | |
80c9fdb0 FD |
2914 | unsigned int attempts; |
2915 | struct iaddr send_addr; | |
2916 | ||
2917 | /* | |
01fa619f SR |
2918 | * Do a quick walk through of the ponds and pools |
2919 | * to see if we have any prefix pools | |
80c9fdb0 | 2920 | */ |
01fa619f SR |
2921 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { |
2922 | if (pond->ipv6_pools == NULL) | |
2923 | continue; | |
2924 | ||
2925 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { | |
2926 | if (p->pool_type == D6O_IA_TA) | |
2927 | break; | |
2928 | } | |
2929 | if (p != NULL) | |
2930 | break; | |
2931 | } | |
2932 | ||
2933 | /* If we get here and p is NULL we have no useful pools */ | |
2934 | if (p == NULL) { | |
80c9fdb0 FD |
2935 | log_debug("Unable to get client addresses: " |
2936 | "no IPv6 pools on this shared network"); | |
2937 | return ISC_R_NORESOURCES; | |
2938 | } | |
2939 | ||
01fa619f SR |
2940 | /* |
2941 | * We have at least one pool that could provide an address | |
2942 | * Now we walk through the ponds and pools again and check | |
2943 | * to see if the client is permitted and if an address is | |
2944 | * available | |
2945 | */ | |
2946 | ||
2947 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
2948 | if (((pond->prohibit_list != NULL) && | |
2949 | (permitted(reply->packet, pond->prohibit_list))) || | |
2950 | ((pond->permit_list != NULL) && | |
2951 | (!permitted(reply->packet, pond->permit_list)))) | |
80c9fdb0 | 2952 | continue; |
80c9fdb0 | 2953 | |
01fa619f SR |
2954 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { |
2955 | if (p->pool_type != D6O_IA_TA) { | |
2956 | continue; | |
2957 | } | |
80c9fdb0 | 2958 | |
01fa619f SR |
2959 | /* |
2960 | * Get an address in this temporary pool. | |
2961 | */ | |
2962 | status = create_lease6(p, &reply->lease, &attempts, | |
2963 | &reply->client_id, cur_time + 120); | |
2964 | if (status != ISC_R_SUCCESS) { | |
2965 | log_debug("Unable to get a temporary address."); | |
2966 | goto cleanup; | |
2967 | } | |
2968 | ||
2969 | status = reply_process_is_addressed(reply, | |
2970 | &reply->lease->scope, | |
2971 | pond->group); | |
2972 | if (status != ISC_R_SUCCESS) { | |
2973 | goto cleanup; | |
2974 | } | |
2975 | send_addr.len = 16; | |
2976 | memcpy(send_addr.iabuf, &reply->lease->addr, 16); | |
2977 | status = reply_process_send_addr(reply, &send_addr); | |
2978 | if (status != ISC_R_SUCCESS) { | |
2979 | goto cleanup; | |
2980 | } | |
2981 | /* | |
2982 | * reply->lease can't be null as we use it above | |
2983 | * add check if that changes | |
2984 | */ | |
2985 | iasubopt_dereference(&reply->lease, MDL); | |
80c9fdb0 | 2986 | } |
80c9fdb0 FD |
2987 | } |
2988 | ||
2989 | cleanup: | |
2990 | if (reply->lease != NULL) { | |
1d17db44 | 2991 | iasubopt_dereference(&reply->lease, MDL); |
80c9fdb0 FD |
2992 | } |
2993 | return status; | |
2994 | } | |
2995 | ||
2996 | /* | |
2997 | * This function only returns failure on 'hard' failures. If it succeeds, | |
2998 | * it will leave a lease structure behind. | |
2999 | */ | |
3000 | static isc_result_t | |
3001 | reply_process_try_addr(struct reply_state *reply, struct iaddr *addr) { | |
d19fa5a1 | 3002 | isc_result_t status = ISC_R_ADDRNOTAVAIL; |
01fa619f SR |
3003 | struct ipv6_pool *pool = NULL; |
3004 | struct ipv6_pond *pond = NULL; | |
80c9fdb0 FD |
3005 | int i; |
3006 | struct data_string data_addr; | |
3007 | ||
3008 | if ((reply == NULL) || (reply->shared == NULL) || | |
d19fa5a1 SR |
3009 | (addr == NULL) || (reply->lease != NULL)) |
3010 | return (DHCP_R_INVALIDARG); | |
3011 | ||
01fa619f SR |
3012 | /* |
3013 | * Do a quick walk through of the ponds and pools | |
3014 | * to see if we have any NA address pools | |
3015 | */ | |
3016 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
3017 | if (pond->ipv6_pools == NULL) | |
3018 | continue; | |
3019 | ||
3020 | for (i = 0; ; i++) { | |
3021 | pool = pond->ipv6_pools[i]; | |
3022 | if ((pool == NULL) || | |
3023 | (pool->pool_type == D6O_IA_NA)) | |
3024 | break; | |
3025 | } | |
3026 | if (pool != NULL) | |
3027 | break; | |
3028 | } | |
3029 | ||
3030 | /* If we get here and p is NULL we have no useful pools */ | |
3031 | if (pool == NULL) { | |
d19fa5a1 | 3032 | return (ISC_R_ADDRNOTAVAIL); |
01fa619f | 3033 | } |
80c9fdb0 FD |
3034 | |
3035 | memset(&data_addr, 0, sizeof(data_addr)); | |
3036 | data_addr.len = addr->len; | |
3037 | data_addr.data = addr->iabuf; | |
3038 | ||
01fa619f SR |
3039 | /* |
3040 | * We have at least one pool that could provide an address | |
3041 | * Now we walk through the ponds and pools again and check | |
3042 | * to see if the client is permitted and if an address is | |
3043 | * available | |
3044 | * | |
3045 | * Within a given pond we start looking at the last pool we | |
3046 | * allocated from, unless it had a collision trying to allocate | |
3047 | * an address. This will tend to move us into less-filled pools. | |
3048 | */ | |
3049 | ||
3050 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
3051 | if (((pond->prohibit_list != NULL) && | |
3052 | (permitted(reply->packet, pond->prohibit_list))) || | |
3053 | ((pond->permit_list != NULL) && | |
3054 | (!permitted(reply->packet, pond->permit_list)))) | |
9322442f | 3055 | continue; |
01fa619f SR |
3056 | |
3057 | for (i = 0 ; (pool = pond->ipv6_pools[i]) != NULL ; i++) { | |
3058 | if (pool->pool_type != D6O_IA_NA) | |
3059 | continue; | |
3060 | ||
3061 | status = try_client_v6_address(&reply->lease, pool, | |
3062 | &data_addr); | |
3063 | if (status == ISC_R_SUCCESS) | |
3064 | break; | |
3065 | } | |
3066 | ||
80c9fdb0 FD |
3067 | if (status == ISC_R_SUCCESS) |
3068 | break; | |
3069 | } | |
3070 | ||
3071 | /* Note that this is just pedantry. There is no allocation to free. */ | |
3072 | data_string_forget(&data_addr, MDL); | |
3073 | /* Return just the most recent status... */ | |
d19fa5a1 | 3074 | return (status); |
80c9fdb0 FD |
3075 | } |
3076 | ||
3077 | /* Look around for an address to give the client. First, look through the | |
3078 | * old IA for addresses we can extend. Second, try to allocate a new address. | |
3079 | * Finally, actually add that address into the current reply IA. | |
3080 | */ | |
3081 | static isc_result_t | |
3082 | find_client_address(struct reply_state *reply) { | |
3083 | struct iaddr send_addr; | |
3084 | isc_result_t status = ISC_R_NORESOURCES; | |
1d17db44 | 3085 | struct iasubopt *lease, *best_lease = NULL; |
80c9fdb0 FD |
3086 | struct binding_scope **scope; |
3087 | struct group *group; | |
3088 | int i; | |
3089 | ||
80c9fdb0 FD |
3090 | if (reply->static_lease) { |
3091 | if (reply->host == NULL) | |
98bf1607 | 3092 | return DHCP_R_INVALIDARG; |
80c9fdb0 FD |
3093 | |
3094 | send_addr.len = 16; | |
3095 | memcpy(send_addr.iabuf, reply->fixed.data, 16); | |
3096 | ||
80c9fdb0 | 3097 | scope = &global_scope; |
2267da84 | 3098 | group = reply->subnet->group; |
80c9fdb0 FD |
3099 | goto send_addr; |
3100 | } | |
3101 | ||
3102 | if (reply->old_ia != NULL) { | |
1d17db44 | 3103 | for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { |
0d8c3d6e | 3104 | struct shared_network *candidate_shared; |
01fa619f | 3105 | struct ipv6_pond *pond; |
0d8c3d6e | 3106 | |
1d17db44 | 3107 | lease = reply->old_ia->iasubopt[i]; |
0d8c3d6e | 3108 | candidate_shared = lease->ipv6_pool->shared_network; |
01fa619f | 3109 | pond = lease->ipv6_pool->ipv6_pond; |
80c9fdb0 | 3110 | |
0d8c3d6e DH |
3111 | /* |
3112 | * Look for the best lease on the client's shared | |
01fa619f | 3113 | * network, that is still permitted |
0d8c3d6e | 3114 | */ |
01fa619f SR |
3115 | |
3116 | if ((candidate_shared != reply->shared) || | |
3117 | (lease6_usable(lease) != ISC_TRUE)) | |
3118 | continue; | |
3119 | ||
3120 | if (((pond->prohibit_list != NULL) && | |
3121 | (permitted(reply->packet, pond->prohibit_list))) || | |
3122 | ((pond->permit_list != NULL) && | |
3123 | (!permitted(reply->packet, pond->permit_list)))) | |
3124 | continue; | |
3125 | ||
3126 | best_lease = lease_compare(lease, best_lease); | |
80c9fdb0 FD |
3127 | } |
3128 | } | |
3129 | ||
3130 | /* Try to pick a new address if we didn't find one, or if we found an | |
3131 | * abandoned lease. | |
3132 | */ | |
3133 | if ((best_lease == NULL) || (best_lease->state == FTS_ABANDONED)) { | |
01fa619f | 3134 | status = pick_v6_address(reply); |
80c9fdb0 | 3135 | } else if (best_lease != NULL) { |
1d17db44 | 3136 | iasubopt_reference(&reply->lease, best_lease, MDL); |
80c9fdb0 FD |
3137 | status = ISC_R_SUCCESS; |
3138 | } | |
3139 | ||
3140 | /* Pick the abandoned lease as a last resort. */ | |
3141 | if ((status == ISC_R_NORESOURCES) && (best_lease != NULL)) { | |
3142 | /* I don't see how this is supposed to be done right now. */ | |
3143 | log_error("Reclaiming abandoned addresses is not yet " | |
3144 | "supported. Treating this as an out of space " | |
3145 | "condition."); | |
1d17db44 | 3146 | /* iasubopt_reference(&reply->lease, best_lease, MDL); */ |
80c9fdb0 FD |
3147 | } |
3148 | ||
3149 | /* Give up now if we didn't find a lease. */ | |
3150 | if (status != ISC_R_SUCCESS) | |
3151 | return status; | |
3152 | ||
3153 | if (reply->lease == NULL) | |
3154 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3155 | ||
7d6180be DH |
3156 | /* Draw binding scopes from the lease's binding scope, and config |
3157 | * from the lease's containing subnet and higher. Note that it may | |
3158 | * be desirable to place the group attachment directly in the pool. | |
3159 | */ | |
80c9fdb0 | 3160 | scope = &reply->lease->scope; |
01fa619f | 3161 | group = reply->lease->ipv6_pool->ipv6_pond->group; |
80c9fdb0 FD |
3162 | |
3163 | send_addr.len = 16; | |
3164 | memcpy(send_addr.iabuf, &reply->lease->addr, 16); | |
3165 | ||
3166 | send_addr: | |
9322442f | 3167 | status = reply_process_is_addressed(reply, scope, group); |
80c9fdb0 FD |
3168 | if (status != ISC_R_SUCCESS) |
3169 | return status; | |
3170 | ||
3171 | status = reply_process_send_addr(reply, &send_addr); | |
3172 | return status; | |
3173 | } | |
3174 | ||
3175 | /* Once an address is found for a client, perform several common functions; | |
3176 | * Calculate and store valid and preferred lease times, draw client options | |
3177 | * into the option state. | |
3178 | */ | |
3179 | static isc_result_t | |
9322442f | 3180 | reply_process_is_addressed(struct reply_state *reply, |
80c9fdb0 FD |
3181 | struct binding_scope **scope, struct group *group) |
3182 | { | |
3183 | isc_result_t status = ISC_R_SUCCESS; | |
3184 | struct data_string data; | |
3185 | struct option_cache *oc; | |
a7341359 SR |
3186 | struct option_state *tmp_options = NULL; |
3187 | struct on_star *on_star; | |
01fa619f | 3188 | int i; |
80c9fdb0 FD |
3189 | |
3190 | /* Initialize values we will cleanup. */ | |
3191 | memset(&data, 0, sizeof(data)); | |
3192 | ||
a7341359 SR |
3193 | /* |
3194 | * Find the proper on_star block to use. We use the | |
3195 | * one in the lease if we have a lease or the one in | |
3196 | * the reply if we don't have a lease because this is | |
3197 | * a static instance | |
3198 | */ | |
3199 | if (reply->lease) { | |
3200 | on_star = &reply->lease->on_star; | |
3201 | } else { | |
3202 | on_star = &reply->on_star; | |
3203 | } | |
3204 | ||
3205 | /* | |
3206 | * Bring in the root configuration. We only do this to bring | |
3207 | * in the on * statements, as we didn't have the lease available | |
3208 | * we did it the first time. | |
3209 | */ | |
3210 | option_state_allocate(&tmp_options, MDL); | |
3211 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3212 | reply->packet->options, tmp_options, | |
3213 | &global_scope, root_group, NULL, | |
3214 | on_star); | |
3215 | if (tmp_options != NULL) { | |
3216 | option_state_dereference(&tmp_options, MDL); | |
3217 | } | |
3218 | ||
2267da84 DH |
3219 | /* |
3220 | * Bring configured options into the root packet level cache - start | |
3221 | * with the lease's closest enclosing group (passed in by the caller | |
3222 | * as 'group'). | |
3223 | */ | |
80c9fdb0 FD |
3224 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, |
3225 | reply->packet->options, reply->opt_state, | |
a7341359 | 3226 | scope, group, root_group, on_star); |
80c9fdb0 | 3227 | |
01fa619f SR |
3228 | /* Execute statements from class scopes. */ |
3229 | for (i = reply->packet->class_count; i > 0; i--) { | |
3230 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3231 | reply->packet->options, | |
3232 | reply->opt_state, scope, | |
3233 | reply->packet->classes[i - 1]->group, | |
3234 | group, on_star); | |
3235 | } | |
3236 | ||
2267da84 DH |
3237 | /* |
3238 | * If there is a host record, over-ride with values configured there, | |
3239 | * without re-evaluating configuration from the previously executed | |
3240 | * group or its common enclosers. | |
3241 | */ | |
3242 | if (reply->host != NULL) | |
3243 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3244 | reply->packet->options, | |
3245 | reply->opt_state, scope, | |
a7341359 SR |
3246 | reply->host->group, group, |
3247 | on_star); | |
2267da84 | 3248 | |
80c9fdb0 FD |
3249 | /* Determine valid lifetime. */ |
3250 | if (reply->client_valid == 0) | |
3251 | reply->send_valid = DEFAULT_DEFAULT_LEASE_TIME; | |
3252 | else | |
3253 | reply->send_valid = reply->client_valid; | |
3254 | ||
3255 | oc = lookup_option(&server_universe, reply->opt_state, | |
3256 | SV_DEFAULT_LEASE_TIME); | |
3257 | if (oc != NULL) { | |
3258 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
3259 | reply->packet->options, | |
3260 | reply->opt_state, | |
3261 | scope, oc, MDL) || | |
3262 | (data.len != 4)) { | |
3263 | log_error("reply_process_is_addressed: unable to " | |
3264 | "evaluate default lease time"); | |
3265 | status = ISC_R_FAILURE; | |
3266 | goto cleanup; | |
3267 | } | |
3268 | ||
3269 | reply->send_valid = getULong(data.data); | |
3270 | data_string_forget(&data, MDL); | |
3271 | } | |
3272 | ||
3273 | if (reply->client_prefer == 0) | |
3274 | reply->send_prefer = reply->send_valid; | |
3275 | else | |
3276 | reply->send_prefer = reply->client_prefer; | |
3277 | ||
3278 | if (reply->send_prefer >= reply->send_valid) | |
3279 | reply->send_prefer = (reply->send_valid / 2) + | |
3280 | (reply->send_valid / 8); | |
3281 | ||
3282 | oc = lookup_option(&server_universe, reply->opt_state, | |
3283 | SV_PREFER_LIFETIME); | |
3284 | if (oc != NULL) { | |
3285 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
3286 | reply->packet->options, | |
3287 | reply->opt_state, | |
3288 | scope, oc, MDL) || | |
3289 | (data.len != 4)) { | |
3290 | log_error("reply_process_is_addressed: unable to " | |
3291 | "evaluate preferred lease time"); | |
3292 | status = ISC_R_FAILURE; | |
3293 | goto cleanup; | |
3294 | } | |
3295 | ||
3296 | reply->send_prefer = getULong(data.data); | |
3297 | data_string_forget(&data, MDL); | |
3298 | } | |
3299 | ||
3300 | /* Note lowest values for later calculation of renew/rebind times. */ | |
3301 | if (reply->prefer > reply->send_prefer) | |
3302 | reply->prefer = reply->send_prefer; | |
3303 | ||
3304 | if (reply->valid > reply->send_valid) | |
3305 | reply->valid = reply->send_valid; | |
3306 | ||
3307 | #if 0 | |
3308 | /* | |
3309 | * XXX: Old 4.0.0 alpha code would change the host {} record | |
3310 | * XXX: uid upon lease assignment. This was intended to cover the | |
3311 | * XXX: case where a client first identifies itself using vendor | |
3312 | * XXX: options in a solicit, or request, but later neglects to include | |
3313 | * XXX: these options in a Renew or Rebind. It is not clear that this | |
3314 | * XXX: is required, and has some startling ramifications (such as | |
3315 | * XXX: how to recover this dynamic host {} state across restarts). | |
3316 | */ | |
3317 | if (reply->host != NULL) | |
3318 | change_host_uid(host, reply->client_id->data, | |
3319 | reply->client_id->len); | |
3320 | #endif /* 0 */ | |
3321 | ||
3322 | /* Perform dynamic lease related update work. */ | |
3323 | if (reply->lease != NULL) { | |
1acab09f FD |
3324 | /* Cached lifetimes */ |
3325 | reply->lease->prefer = reply->send_prefer; | |
3326 | reply->lease->valid = reply->send_valid; | |
3327 | ||
80c9fdb0 | 3328 | /* Advance (or rewind) the valid lifetime. */ |
5d89d60f FD |
3329 | if (reply->buf.reply.msg_type == DHCPV6_REPLY) { |
3330 | reply->lease->soft_lifetime_end_time = | |
3331 | cur_time + reply->send_valid; | |
3332 | /* Wait before renew! */ | |
3333 | } | |
80c9fdb0 | 3334 | |
1d17db44 | 3335 | status = ia_add_iasubopt(reply->ia, reply->lease, MDL); |
80c9fdb0 FD |
3336 | if (status != ISC_R_SUCCESS) { |
3337 | log_fatal("reply_process_is_addressed: Unable to " | |
3338 | "attach lease to new IA: %s", | |
3339 | isc_result_totext(status)); | |
3340 | } | |
3341 | ||
3342 | /* | |
3343 | * If this is a new lease, make sure it is attached somewhere. | |
3344 | */ | |
9322442f FD |
3345 | if (reply->lease->ia == NULL) { |
3346 | ia_reference(&reply->lease->ia, reply->ia, MDL); | |
80c9fdb0 FD |
3347 | } |
3348 | } | |
3349 | ||
3350 | /* Bring a copy of the relevant options into the IA scope. */ | |
3351 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3352 | reply->packet->options, reply->reply_ia, | |
a7341359 | 3353 | scope, group, root_group, NULL); |
80c9fdb0 | 3354 | |
01fa619f SR |
3355 | /* Execute statements from class scopes. */ |
3356 | for (i = reply->packet->class_count; i > 0; i--) { | |
3357 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3358 | reply->packet->options, | |
3359 | reply->reply_ia, scope, | |
3360 | reply->packet->classes[i - 1]->group, | |
3361 | group, NULL); | |
3362 | } | |
3363 | ||
2267da84 DH |
3364 | /* |
3365 | * And bring in host record configuration, if any, but not to overlap | |
3366 | * the previous group or its common enclosers. | |
3367 | */ | |
3368 | if (reply->host != NULL) | |
3369 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3370 | reply->packet->options, | |
3371 | reply->reply_ia, scope, | |
a7341359 | 3372 | reply->host->group, group, NULL); |
2267da84 | 3373 | |
80c9fdb0 FD |
3374 | cleanup: |
3375 | if (data.data != NULL) | |
3376 | data_string_forget(&data, MDL); | |
3377 | ||
3378 | if (status == ISC_R_SUCCESS) | |
3379 | reply->client_resources++; | |
3380 | ||
3381 | return status; | |
3382 | } | |
3383 | ||
3384 | /* Simply send an IAADDR within the IA scope as described. */ | |
3385 | static isc_result_t | |
3386 | reply_process_send_addr(struct reply_state *reply, struct iaddr *addr) { | |
3387 | isc_result_t status = ISC_R_SUCCESS; | |
3388 | struct data_string data; | |
3389 | ||
3390 | memset(&data, 0, sizeof(data)); | |
3391 | ||
3392 | /* Now append the lease. */ | |
3393 | data.len = IAADDR_OFFSET; | |
3394 | if (!buffer_allocate(&data.buffer, data.len, MDL)) { | |
3395 | log_error("reply_process_send_addr: out of memory" | |
3396 | "allocating new IAADDR buffer."); | |
3397 | status = ISC_R_NOMEMORY; | |
3398 | goto cleanup; | |
3399 | } | |
3400 | data.data = data.buffer->data; | |
3401 | ||
3402 | memcpy(data.buffer->data, addr->iabuf, 16); | |
3403 | putULong(data.buffer->data + 16, reply->send_prefer); | |
3404 | putULong(data.buffer->data + 20, reply->send_valid); | |
3405 | ||
3406 | if (!append_option_buffer(&dhcpv6_universe, reply->reply_ia, | |
3407 | data.buffer, data.buffer->data, | |
3408 | data.len, D6O_IAADDR, 0)) { | |
3409 | log_error("reply_process_send_addr: unable " | |
3410 | "to save IAADDR option"); | |
3411 | status = ISC_R_FAILURE; | |
3412 | goto cleanup; | |
3413 | } | |
3414 | ||
9322442f | 3415 | reply->resources_included = ISC_TRUE; |
80c9fdb0 FD |
3416 | |
3417 | cleanup: | |
3418 | if (data.data != NULL) | |
3419 | data_string_forget(&data, MDL); | |
3420 | ||
3421 | return status; | |
3422 | } | |
3423 | ||
3424 | /* Choose the better of two leases. */ | |
1d17db44 FD |
3425 | static struct iasubopt * |
3426 | lease_compare(struct iasubopt *alpha, struct iasubopt *beta) { | |
80c9fdb0 FD |
3427 | if (alpha == NULL) |
3428 | return beta; | |
3429 | if (beta == NULL) | |
3430 | return alpha; | |
3431 | ||
3432 | switch(alpha->state) { | |
3433 | case FTS_ACTIVE: | |
3434 | switch(beta->state) { | |
3435 | case FTS_ACTIVE: | |
3436 | /* Choose the lease with the longest lifetime (most | |
3437 | * likely the most recently allocated). | |
3438 | */ | |
5d89d60f FD |
3439 | if (alpha->hard_lifetime_end_time < |
3440 | beta->hard_lifetime_end_time) | |
80c9fdb0 FD |
3441 | return beta; |
3442 | else | |
3443 | return alpha; | |
3444 | ||
3445 | case FTS_EXPIRED: | |
3446 | case FTS_ABANDONED: | |
3447 | return alpha; | |
3448 | ||
3449 | default: | |
3450 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3451 | } | |
3452 | break; | |
3453 | ||
3454 | case FTS_EXPIRED: | |
3455 | switch (beta->state) { | |
3456 | case FTS_ACTIVE: | |
3457 | return beta; | |
3458 | ||
3459 | case FTS_EXPIRED: | |
3460 | /* Choose the most recently expired lease. */ | |
5d89d60f FD |
3461 | if (alpha->hard_lifetime_end_time < |
3462 | beta->hard_lifetime_end_time) | |
3463 | return beta; | |
3464 | else if ((alpha->hard_lifetime_end_time == | |
3465 | beta->hard_lifetime_end_time) && | |
3466 | (alpha->soft_lifetime_end_time < | |
3467 | beta->soft_lifetime_end_time)) | |
80c9fdb0 FD |
3468 | return beta; |
3469 | else | |
3470 | return alpha; | |
3471 | ||
3472 | case FTS_ABANDONED: | |
3473 | return alpha; | |
3474 | ||
3475 | default: | |
3476 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3477 | } | |
3478 | break; | |
3479 | ||
3480 | case FTS_ABANDONED: | |
3481 | switch (beta->state) { | |
3482 | case FTS_ACTIVE: | |
3483 | case FTS_EXPIRED: | |
3484 | return alpha; | |
3485 | ||
3486 | case FTS_ABANDONED: | |
3487 | /* Choose the lease that was abandoned longest ago. */ | |
5d89d60f FD |
3488 | if (alpha->hard_lifetime_end_time < |
3489 | beta->hard_lifetime_end_time) | |
80c9fdb0 | 3490 | return alpha; |
a07d99bb TM |
3491 | else |
3492 | return beta; | |
80c9fdb0 FD |
3493 | |
3494 | default: | |
3495 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3496 | } | |
3497 | break; | |
3498 | ||
3499 | default: | |
3500 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3501 | } | |
3502 | ||
3503 | log_fatal("Triple impossible condition at %s:%d.", MDL); | |
3504 | return NULL; | |
3505 | } | |
3506 | ||
3507 | /* Process a client-supplied IA_PD. This may append options to the tail of | |
3508 | * the reply packet being built in the reply_state structure. | |
3509 | */ | |
3510 | static isc_result_t | |
9322442f | 3511 | reply_process_ia_pd(struct reply_state *reply, struct option_cache *ia) { |
80c9fdb0 FD |
3512 | isc_result_t status = ISC_R_SUCCESS; |
3513 | u_int32_t iaid; | |
3514 | unsigned ia_cursor; | |
3515 | struct option_state *packet_ia; | |
3516 | struct option_cache *oc; | |
9322442f | 3517 | struct data_string ia_data, data; |
80c9fdb0 FD |
3518 | |
3519 | /* Initialize values that will get cleaned up on return. */ | |
3520 | packet_ia = NULL; | |
9322442f | 3521 | memset(&ia_data, 0, sizeof(ia_data)); |
80c9fdb0 | 3522 | memset(&data, 0, sizeof(data)); |
80c9fdb0 | 3523 | /* |
9322442f | 3524 | * Note that find_client_prefix() may set reply->lease. |
80c9fdb0 FD |
3525 | */ |
3526 | ||
3527 | /* Make sure there is at least room for the header. */ | |
3528 | if ((reply->cursor + IA_PD_OFFSET + 4) > sizeof(reply->buf)) { | |
3529 | log_error("reply_process_ia_pd: Reply too long for IA."); | |
3530 | return ISC_R_NOSPACE; | |
3531 | } | |
3532 | ||
3533 | ||
3534 | /* Fetch the IA_PD contents. */ | |
9322442f FD |
3535 | if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, |
3536 | ia, IA_PD_OFFSET)) { | |
3537 | log_error("reply_process_ia_pd: error evaluating ia"); | |
80c9fdb0 FD |
3538 | status = ISC_R_FAILURE; |
3539 | goto cleanup; | |
3540 | } | |
3541 | ||
3542 | /* Extract IA_PD header contents. */ | |
9322442f FD |
3543 | iaid = getULong(ia_data.data); |
3544 | reply->renew = getULong(ia_data.data + 4); | |
3545 | reply->rebind = getULong(ia_data.data + 8); | |
80c9fdb0 FD |
3546 | |
3547 | /* Create an IA_PD structure. */ | |
9322442f FD |
3548 | if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, |
3549 | reply->client_id.len, MDL) != ISC_R_SUCCESS) { | |
3550 | log_error("reply_process_ia_pd: no memory for ia."); | |
80c9fdb0 FD |
3551 | status = ISC_R_NOMEMORY; |
3552 | goto cleanup; | |
3553 | } | |
9322442f | 3554 | reply->ia->ia_type = D6O_IA_PD; |
80c9fdb0 FD |
3555 | |
3556 | /* Cache pre-existing IA_PD, if any. */ | |
9322442f FD |
3557 | ia_hash_lookup(&reply->old_ia, ia_pd_active, |
3558 | (unsigned char *)reply->ia->iaid_duid.data, | |
3559 | reply->ia->iaid_duid.len, MDL); | |
80c9fdb0 FD |
3560 | |
3561 | /* | |
3562 | * Create an option cache to carry the IA_PD option contents, and | |
3563 | * execute any user-supplied values into it. | |
3564 | */ | |
3565 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
3566 | status = ISC_R_NOMEMORY; | |
3567 | goto cleanup; | |
3568 | } | |
3569 | ||
3570 | /* Check & count the fixed prefix host records. */ | |
3571 | reply->static_prefixes = 0; | |
3572 | if ((reply->host != NULL) && (reply->host->fixed_prefix != NULL)) { | |
3573 | struct iaddrcidrnetlist *fp; | |
3574 | ||
3575 | for (fp = reply->host->fixed_prefix; fp != NULL; | |
3576 | fp = fp->next) { | |
3577 | reply->static_prefixes += 1; | |
3578 | } | |
3579 | } | |
3580 | ||
3581 | /* | |
3582 | * Save the cursor position at the start of the IA_PD, so we can | |
3583 | * set length and adjust t1/t2 values later. We write a temporary | |
3584 | * header out now just in case we decide to adjust the packet | |
3585 | * within sub-process functions. | |
3586 | */ | |
3587 | ia_cursor = reply->cursor; | |
3588 | ||
3589 | /* Initialize the IA_PD header. First the code. */ | |
3590 | putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_PD); | |
3591 | reply->cursor += 2; | |
3592 | ||
3593 | /* Then option length. */ | |
3594 | putUShort(reply->buf.data + reply->cursor, 0x0Cu); | |
3595 | reply->cursor += 2; | |
3596 | ||
3597 | /* Then IA_PD header contents; IAID. */ | |
3598 | putULong(reply->buf.data + reply->cursor, iaid); | |
3599 | reply->cursor += 4; | |
3600 | ||
3601 | /* We store the client's t1 for now, and may over-ride it later. */ | |
3602 | putULong(reply->buf.data + reply->cursor, reply->renew); | |
3603 | reply->cursor += 4; | |
3604 | ||
3605 | /* We store the client's t2 for now, and may over-ride it later. */ | |
3606 | putULong(reply->buf.data + reply->cursor, reply->rebind); | |
3607 | reply->cursor += 4; | |
3608 | ||
3609 | /* | |
3610 | * For each prefix in this IA_PD, decide what to do about it. | |
3611 | */ | |
3612 | oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAPREFIX); | |
3613 | reply->valid = reply->prefer = 0xffffffff; | |
3614 | reply->client_valid = reply->client_prefer = 0; | |
3615 | reply->preflen = -1; | |
3616 | for (; oc != NULL ; oc = oc->next) { | |
3617 | status = reply_process_prefix(reply, oc); | |
3618 | ||
3619 | /* | |
3620 | * Canceled means we did not allocate prefixes to the | |
3621 | * client, but we're "done" with this IA - we set a status | |
3622 | * code. So transmit this reply, e.g., move on to the next | |
3623 | * IA. | |
3624 | */ | |
3625 | if (status == ISC_R_CANCELED) | |
3626 | break; | |
3627 | ||
d19fa5a1 SR |
3628 | if ((status != ISC_R_SUCCESS) && |
3629 | (status != ISC_R_ADDRINUSE) && | |
3630 | (status != ISC_R_ADDRNOTAVAIL)) | |
80c9fdb0 FD |
3631 | goto cleanup; |
3632 | } | |
3633 | ||
9322442f | 3634 | reply->pd_count++; |
80c9fdb0 FD |
3635 | |
3636 | /* | |
3637 | * If we fell through the above and never gave the client | |
3638 | * a prefix, give it one now. | |
3639 | */ | |
3640 | if ((status != ISC_R_CANCELED) && (reply->client_resources == 0)) { | |
3641 | status = find_client_prefix(reply); | |
3642 | ||
3643 | if (status == ISC_R_NORESOURCES) { | |
3644 | switch (reply->packet->dhcpv6_msg_type) { | |
3645 | case DHCPV6_SOLICIT: | |
3646 | /* | |
3647 | * No prefix for any IA is handled | |
3648 | * by the caller. | |
3649 | */ | |
3650 | /* FALL THROUGH */ | |
3651 | ||
3652 | case DHCPV6_REQUEST: | |
3653 | /* Same than for addresses. */ | |
3654 | option_state_dereference(&reply->reply_ia, MDL); | |
3655 | if (!option_state_allocate(&reply->reply_ia, | |
3656 | MDL)) | |
3657 | { | |
3658 | log_error("reply_process_ia_pd: No " | |
3659 | "memory for option state " | |
3660 | "wipe."); | |
3661 | status = ISC_R_NOMEMORY; | |
3662 | goto cleanup; | |
3663 | } | |
3664 | ||
3665 | if (!set_status_code(STATUS_NoPrefixAvail, | |
3666 | "No prefixes available " | |
3667 | "for this interface.", | |
3668 | reply->reply_ia)) { | |
3669 | log_error("reply_process_ia_pd: " | |
3670 | "Unable to set " | |
3671 | "NoPrefixAvail status " | |
3672 | "code."); | |
3673 | status = ISC_R_FAILURE; | |
3674 | goto cleanup; | |
3675 | } | |
3676 | ||
3677 | status = ISC_R_SUCCESS; | |
3678 | break; | |
3679 | ||
3680 | default: | |
9322442f | 3681 | if (reply->resources_included) |
80c9fdb0 FD |
3682 | status = ISC_R_SUCCESS; |
3683 | else | |
3684 | goto cleanup; | |
3685 | break; | |
3686 | } | |
3687 | } | |
3688 | ||
3689 | if (status != ISC_R_SUCCESS) | |
3690 | goto cleanup; | |
3691 | } | |
3692 | ||
3693 | reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, | |
3694 | sizeof(reply->buf) - reply->cursor, | |
3695 | reply->reply_ia, reply->packet, | |
3696 | required_opts_IA_PD, NULL); | |
3697 | ||
3698 | /* Reset the length of this IA_PD to match what was just written. */ | |
3699 | putUShort(reply->buf.data + ia_cursor + 2, | |
3700 | reply->cursor - (ia_cursor + 4)); | |
3701 | ||
3702 | /* | |
3703 | * T1/T2 time selection is kind of weird. We actually use DHCP | |
3704 | * (v4) scoped options as handy existing places where these might | |
3705 | * be configured by an administrator. A value of zero tells the | |
3706 | * client it may choose its own renewal time. | |
3707 | */ | |
3708 | reply->renew = 0; | |
3709 | oc = lookup_option(&dhcp_universe, reply->opt_state, | |
3710 | DHO_DHCP_RENEWAL_TIME); | |
3711 | if (oc != NULL) { | |
3712 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
3713 | reply->packet->options, | |
3714 | reply->opt_state, &global_scope, | |
3715 | oc, MDL) || | |
3716 | (data.len != 4)) { | |
3717 | log_error("Invalid renewal time."); | |
3718 | } else { | |
3719 | reply->renew = getULong(data.data); | |
3720 | } | |
3721 | ||
3722 | if (data.data != NULL) | |
3723 | data_string_forget(&data, MDL); | |
3724 | } | |
3725 | putULong(reply->buf.data + ia_cursor + 8, reply->renew); | |
3726 | ||
3727 | /* Now T2. */ | |
3728 | reply->rebind = 0; | |
3729 | oc = lookup_option(&dhcp_universe, reply->opt_state, | |
3730 | DHO_DHCP_REBINDING_TIME); | |
3731 | if (oc != NULL) { | |
3732 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
3733 | reply->packet->options, | |
3734 | reply->opt_state, &global_scope, | |
3735 | oc, MDL) || | |
3736 | (data.len != 4)) { | |
3737 | log_error("Invalid rebinding time."); | |
3738 | } else { | |
3739 | reply->rebind = getULong(data.data); | |
3740 | } | |
3741 | ||
3742 | if (data.data != NULL) | |
3743 | data_string_forget(&data, MDL); | |
3744 | } | |
3745 | putULong(reply->buf.data + ia_cursor + 12, reply->rebind); | |
3746 | ||
d9b5c150 SR |
3747 | /* |
3748 | * yes, goto's aren't the best but we also want to avoid extra | |
3749 | * indents | |
3750 | */ | |
3751 | if (status == ISC_R_CANCELED) | |
3752 | goto cleanup; | |
3753 | ||
3754 | /* | |
3755 | * Handle static prefixes, we always log stuff and if it's | |
3756 | * a hard binding we run any commit statements that we have | |
3757 | */ | |
3758 | if (reply->static_prefixes != 0) { | |
3759 | char tmp_addr[INET6_ADDRSTRLEN]; | |
3760 | log_info("%s PD: address %s/%d to client with duid %s " | |
3761 | "iaid = %d static", | |
3762 | dhcpv6_type_names[reply->buf.reply.msg_type], | |
3763 | inet_ntop(AF_INET6, reply->fixed_pref.lo_addr.iabuf, | |
3764 | tmp_addr, sizeof(tmp_addr)), | |
3765 | reply->fixed_pref.bits, | |
3766 | print_hex_1(reply->client_id.len, | |
3767 | reply->client_id.data, 60), | |
3768 | iaid); | |
3769 | if ((reply->buf.reply.msg_type == DHCPV6_REPLY) && | |
3770 | (reply->on_star.on_commit != NULL)) { | |
3771 | execute_statements(NULL, reply->packet, NULL, NULL, | |
3772 | reply->packet->options, | |
3773 | reply->opt_state, | |
3774 | NULL, reply->on_star.on_commit, | |
3775 | NULL); | |
3776 | executable_statement_dereference | |
3777 | (&reply->on_star.on_commit, MDL); | |
3778 | } | |
3779 | goto cleanup; | |
3780 | } | |
3781 | ||
3782 | /* | |
3783 | * If we have any addresses log what we are doing. | |
3784 | */ | |
3785 | if (reply->ia->num_iasubopt != 0) { | |
3786 | struct iasubopt *tmp; | |
3787 | int i; | |
3788 | char tmp_addr[INET6_ADDRSTRLEN]; | |
3789 | ||
3790 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { | |
3791 | tmp = reply->ia->iasubopt[i]; | |
3792 | ||
3793 | log_info("%s PD: address %s/%d to client with duid %s" | |
3794 | " iaid = %d valid for %d seconds", | |
3795 | dhcpv6_type_names[reply->buf.reply.msg_type], | |
3796 | inet_ntop(AF_INET6, &tmp->addr, | |
3797 | tmp_addr, sizeof(tmp_addr)), | |
3798 | (int)tmp->plen, | |
3799 | print_hex_1(reply->client_id.len, | |
3800 | reply->client_id.data, 60), | |
3801 | iaid, tmp->valid); | |
3802 | } | |
3803 | } | |
3804 | ||
80c9fdb0 FD |
3805 | /* |
3806 | * If this is not a 'soft' binding, consume the new changes into | |
3807 | * the database (if any have been attached to the ia_pd). | |
3808 | * | |
3809 | * Loop through the assigned dynamic prefixes, referencing the | |
3810 | * prefixes onto this IA_PD rather than any old ones, and updating | |
3811 | * prefix pool timers for each (if any). | |
3812 | */ | |
d9b5c150 | 3813 | if ((reply->buf.reply.msg_type == DHCPV6_REPLY) && |
1d17db44 FD |
3814 | (reply->ia->num_iasubopt != 0)) { |
3815 | struct iasubopt *tmp; | |
80c9fdb0 FD |
3816 | struct data_string *ia_id; |
3817 | int i; | |
3818 | ||
1d17db44 FD |
3819 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { |
3820 | tmp = reply->ia->iasubopt[i]; | |
80c9fdb0 | 3821 | |
9322442f FD |
3822 | if (tmp->ia != NULL) |
3823 | ia_dereference(&tmp->ia, MDL); | |
3824 | ia_reference(&tmp->ia, reply->ia, MDL); | |
80c9fdb0 | 3825 | |
5d89d60f | 3826 | /* Commit 'hard' bindings. */ |
9322442f FD |
3827 | renew_lease6(tmp->ipv6_pool, tmp); |
3828 | schedule_lease_timeout(tmp->ipv6_pool); | |
a7341359 SR |
3829 | |
3830 | /* If we have anything to do on commit do it now */ | |
3831 | if (tmp->on_star.on_commit != NULL) { | |
3832 | execute_statements(NULL, reply->packet, | |
3833 | NULL, NULL, | |
3834 | reply->packet->options, | |
3835 | reply->opt_state, | |
58cb5d86 | 3836 | &tmp->scope, |
a7341359 SR |
3837 | tmp->on_star.on_commit, |
3838 | &tmp->on_star); | |
3839 | executable_statement_dereference | |
3840 | (&tmp->on_star.on_commit, MDL); | |
3841 | } | |
250f7134 SR |
3842 | |
3843 | /* Do our threshold check. */ | |
3844 | check_pool6_threshold(reply, tmp); | |
80c9fdb0 FD |
3845 | } |
3846 | ||
9322442f FD |
3847 | /* Remove any old ia from the hash. */ |
3848 | if (reply->old_ia != NULL) { | |
3849 | ia_id = &reply->old_ia->iaid_duid; | |
3850 | ia_hash_delete(ia_pd_active, | |
3851 | (unsigned char *)ia_id->data, | |
3852 | ia_id->len, MDL); | |
3853 | ia_dereference(&reply->old_ia, MDL); | |
80c9fdb0 FD |
3854 | } |
3855 | ||
9322442f | 3856 | /* Put new ia into the hash. */ |
1acab09f | 3857 | reply->ia->cltt = cur_time; |
9322442f FD |
3858 | ia_id = &reply->ia->iaid_duid; |
3859 | ia_hash_add(ia_pd_active, (unsigned char *)ia_id->data, | |
3860 | ia_id->len, reply->ia, MDL); | |
80c9fdb0 | 3861 | |
9322442f | 3862 | write_ia(reply->ia); |
ad80055f SR |
3863 | } else { |
3864 | schedule_lease_timeout_reply(reply); | |
80c9fdb0 FD |
3865 | } |
3866 | ||
3867 | cleanup: | |
3868 | if (packet_ia != NULL) | |
3869 | option_state_dereference(&packet_ia, MDL); | |
3870 | if (reply->reply_ia != NULL) | |
3871 | option_state_dereference(&reply->reply_ia, MDL); | |
9322442f FD |
3872 | if (ia_data.data != NULL) |
3873 | data_string_forget(&ia_data, MDL); | |
80c9fdb0 FD |
3874 | if (data.data != NULL) |
3875 | data_string_forget(&data, MDL); | |
9322442f FD |
3876 | if (reply->ia != NULL) |
3877 | ia_dereference(&reply->ia, MDL); | |
3878 | if (reply->old_ia != NULL) | |
3879 | ia_dereference(&reply->old_ia, MDL); | |
3880 | if (reply->lease != NULL) | |
1d17db44 | 3881 | iasubopt_dereference(&reply->lease, MDL); |
a7341359 SR |
3882 | if (reply->on_star.on_expiry != NULL) |
3883 | executable_statement_dereference | |
3884 | (&reply->on_star.on_expiry, MDL); | |
3885 | if (reply->on_star.on_release != NULL) | |
3886 | executable_statement_dereference | |
3887 | (&reply->on_star.on_release, MDL); | |
80c9fdb0 FD |
3888 | |
3889 | /* | |
3890 | * ISC_R_CANCELED is a status code used by the prefix processing to | |
3891 | * indicate we're replying with a status code. This is still a | |
3892 | * success at higher layers. | |
3893 | */ | |
3894 | return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); | |
3895 | } | |
3896 | ||
3897 | /* | |
3898 | * Process an IAPREFIX within a given IA_PD, storing any IAPREFIX reply | |
3899 | * contents into the reply's current ia_pd-scoped option cache. Returns | |
3900 | * ISC_R_CANCELED in the event we are replying with a status code and do | |
3901 | * not wish to process more IAPREFIXes within this IA_PD. | |
3902 | */ | |
3903 | static isc_result_t | |
3904 | reply_process_prefix(struct reply_state *reply, struct option_cache *pref) { | |
3905 | u_int32_t pref_life, valid_life; | |
3906 | struct binding_scope **scope; | |
80c9fdb0 FD |
3907 | struct iaddrcidrnet tmp_pref; |
3908 | struct option_cache *oc; | |
3909 | struct data_string iapref, data; | |
80c9fdb0 | 3910 | isc_result_t status = ISC_R_SUCCESS; |
01fa619f | 3911 | struct group *group; |
80c9fdb0 FD |
3912 | |
3913 | /* Initializes values that will be cleaned up. */ | |
80c9fdb0 FD |
3914 | memset(&iapref, 0, sizeof(iapref)); |
3915 | memset(&data, 0, sizeof(data)); | |
9322442f | 3916 | /* Note that reply->lease may be set by prefix_is_owned() */ |
80c9fdb0 FD |
3917 | |
3918 | /* | |
3919 | * There is no point trying to process an incoming prefix if there | |
3920 | * is no room for an outgoing prefix. | |
3921 | */ | |
3922 | if ((reply->cursor + 29) > sizeof(reply->buf)) { | |
3923 | log_error("reply_process_prefix: Out of room for prefix."); | |
3924 | return ISC_R_NOSPACE; | |
3925 | } | |
3926 | ||
3927 | /* Extract this IAPREFIX option. */ | |
3928 | if (!evaluate_option_cache(&iapref, reply->packet, NULL, NULL, | |
3929 | reply->packet->options, NULL, &global_scope, | |
3930 | pref, MDL) || | |
3931 | (iapref.len < IAPREFIX_OFFSET)) { | |
3932 | log_error("reply_process_prefix: error evaluating IAPREFIX."); | |
3933 | status = ISC_R_FAILURE; | |
3934 | goto cleanup; | |
3935 | } | |
3936 | ||
3937 | /* | |
3938 | * Layout: preferred and valid lifetimes followed by the prefix | |
3939 | * length and the IPv6 address. | |
3940 | */ | |
3941 | pref_life = getULong(iapref.data); | |
3942 | valid_life = getULong(iapref.data + 4); | |
3943 | ||
3944 | if ((reply->client_valid == 0) || | |
3945 | (reply->client_valid > valid_life)) | |
3946 | reply->client_valid = valid_life; | |
3947 | ||
3948 | if ((reply->client_prefer == 0) || | |
3949 | (reply->client_prefer > pref_life)) | |
3950 | reply->client_prefer = pref_life; | |
3951 | ||
3952 | /* | |
3953 | * Clients may choose to send ::/0 as a prefix, with the idea to give | |
3954 | * hints about preferred-lifetime or valid-lifetime. | |
3955 | */ | |
3956 | tmp_pref.lo_addr.len = 16; | |
3957 | memset(tmp_pref.lo_addr.iabuf, 0, 16); | |
3958 | if ((iapref.data[8] == 0) && | |
3959 | (memcmp(iapref.data + 9, tmp_pref.lo_addr.iabuf, 16) == 0)) { | |
3960 | /* Status remains success; we just ignore this one. */ | |
3961 | goto cleanup; | |
3962 | } | |
3963 | ||
3964 | /* | |
3965 | * Clients may choose to send ::/X as a prefix to specify a | |
3966 | * preferred/requested prefix length. Note X is never zero here. | |
3967 | */ | |
3968 | tmp_pref.bits = (int) iapref.data[8]; | |
3969 | if (reply->preflen < 0) { | |
3970 | /* Cache the first preferred prefix length. */ | |
3971 | reply->preflen = tmp_pref.bits; | |
3972 | } | |
3973 | if (memcmp(iapref.data + 9, tmp_pref.lo_addr.iabuf, 16) == 0) { | |
3974 | goto cleanup; | |
3975 | } | |
3976 | ||
3977 | memcpy(tmp_pref.lo_addr.iabuf, iapref.data + 9, 16); | |
3978 | ||
3979 | /* Verify the prefix belongs to the client. */ | |
3980 | if (!prefix_is_owned(reply, &tmp_pref)) { | |
3981 | /* Same than for addresses. */ | |
3982 | if ((reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) || | |
3983 | (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) || | |
3984 | (reply->packet->dhcpv6_msg_type == DHCPV6_REBIND)) { | |
3985 | status = reply_process_try_prefix(reply, &tmp_pref); | |
3986 | ||
3987 | /* Either error out or skip this prefix. */ | |
d19fa5a1 SR |
3988 | if ((status != ISC_R_SUCCESS) && |
3989 | (status != ISC_R_ADDRINUSE) && | |
3990 | (status != ISC_R_ADDRNOTAVAIL)) | |
80c9fdb0 FD |
3991 | goto cleanup; |
3992 | ||
9322442f | 3993 | if (reply->lease == NULL) { |
80c9fdb0 FD |
3994 | if (reply->packet->dhcpv6_msg_type == |
3995 | DHCPV6_REBIND) { | |
3996 | reply->send_prefer = 0; | |
3997 | reply->send_valid = 0; | |
3998 | goto send_pref; | |
3999 | } | |
4000 | ||
4001 | /* status remains success - ignore */ | |
4002 | goto cleanup; | |
4003 | } | |
80c9fdb0 FD |
4004 | /* |
4005 | * RFC3633 section 18.2.3: | |
4006 | * | |
4007 | * If the delegating router cannot find a binding | |
4008 | * for the requesting router's IA_PD the delegating | |
4009 | * router returns the IA_PD containing no prefixes | |
4010 | * with a Status Code option set to NoBinding in the | |
4011 | * Reply message. | |
4012 | * | |
4013 | * On mismatch we (ab)use this pretending we have not the IA | |
4014 | * as soon as we have not a prefix. | |
4015 | */ | |
4016 | } else if (reply->packet->dhcpv6_msg_type == DHCPV6_RENEW) { | |
4017 | /* Rewind the IA_PD to empty. */ | |
4018 | option_state_dereference(&reply->reply_ia, MDL); | |
4019 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
4020 | log_error("reply_process_prefix: No memory " | |
4021 | "for option state wipe."); | |
4022 | status = ISC_R_NOMEMORY; | |
4023 | goto cleanup; | |
4024 | } | |
4025 | ||
4026 | /* Append a NoBinding status code. */ | |
4027 | if (!set_status_code(STATUS_NoBinding, | |
4028 | "Prefix not bound to this " | |
4029 | "interface.", reply->reply_ia)) { | |
4030 | log_error("reply_process_prefix: Unable to " | |
4031 | "attach status code."); | |
4032 | status = ISC_R_FAILURE; | |
4033 | goto cleanup; | |
4034 | } | |
4035 | ||
4036 | /* Fin (no more IAPREFIXes). */ | |
4037 | status = ISC_R_CANCELED; | |
4038 | goto cleanup; | |
4039 | } else { | |
4040 | log_error("It is impossible to lease a client that is " | |
4041 | "not sending a solicit, request, renew, or " | |
4042 | "rebind message."); | |
4043 | status = ISC_R_FAILURE; | |
4044 | goto cleanup; | |
4045 | } | |
4046 | } | |
4047 | ||
4048 | if (reply->static_prefixes > 0) { | |
4049 | if (reply->host == NULL) | |
4050 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4051 | ||
4052 | scope = &global_scope; | |
01fa619f SR |
4053 | |
4054 | /* Find the static prefixe's subnet. */ | |
4055 | if (find_grouped_subnet(&reply->subnet, reply->shared, | |
4056 | tmp_pref.lo_addr, MDL) == 0) | |
4057 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4058 | group = reply->subnet->group; | |
4059 | subnet_dereference(&reply->subnet, MDL); | |
d9b5c150 SR |
4060 | |
4061 | /* Copy the static prefix for logging purposes */ | |
4062 | memcpy(&reply->fixed_pref, &tmp_pref, sizeof(tmp_pref)); | |
80c9fdb0 | 4063 | } else { |
9322442f | 4064 | if (reply->lease == NULL) |
80c9fdb0 FD |
4065 | log_fatal("Impossible condition at %s:%d.", MDL); |
4066 | ||
9322442f | 4067 | scope = &reply->lease->scope; |
01fa619f | 4068 | group = reply->lease->ipv6_pool->ipv6_pond->group; |
80c9fdb0 FD |
4069 | } |
4070 | ||
4071 | /* | |
4072 | * If client_resources is nonzero, then the reply_process_is_prefixed | |
4073 | * function has executed configuration state into the reply option | |
4074 | * cache. We will use that valid cache to derive configuration for | |
4075 | * whether or not to engage in additional prefixes, and similar. | |
4076 | */ | |
4077 | if (reply->client_resources != 0) { | |
4078 | unsigned limit = 1; | |
4079 | ||
4080 | /* | |
4081 | * Does this client have "enough" prefixes already? Default | |
4082 | * to one. Everybody gets one, and one should be enough for | |
4083 | * anybody. | |
4084 | */ | |
4085 | oc = lookup_option(&server_universe, reply->opt_state, | |
4086 | SV_LIMIT_PREFS_PER_IA); | |
4087 | if (oc != NULL) { | |
4088 | if (!evaluate_option_cache(&data, reply->packet, | |
4089 | NULL, NULL, | |
4090 | reply->packet->options, | |
4091 | reply->opt_state, | |
4092 | scope, oc, MDL) || | |
4093 | (data.len != 4)) { | |
4094 | log_error("reply_process_prefix: unable to " | |
4095 | "evaluate prefs-per-ia value."); | |
4096 | status = ISC_R_FAILURE; | |
4097 | goto cleanup; | |
4098 | } | |
4099 | ||
4100 | limit = getULong(data.data); | |
4101 | data_string_forget(&data, MDL); | |
4102 | } | |
4103 | ||
4104 | /* | |
4105 | * If we wish to limit the client to a certain number of | |
4106 | * prefixes, then omit the prefix from the reply. | |
4107 | */ | |
4108 | if (reply->client_resources >= limit) | |
4109 | goto cleanup; | |
4110 | } | |
4111 | ||
01fa619f | 4112 | status = reply_process_is_prefixed(reply, scope, group); |
80c9fdb0 FD |
4113 | if (status != ISC_R_SUCCESS) |
4114 | goto cleanup; | |
4115 | ||
4116 | send_pref: | |
4117 | status = reply_process_send_prefix(reply, &tmp_pref); | |
4118 | ||
4119 | cleanup: | |
4120 | if (iapref.data != NULL) | |
4121 | data_string_forget(&iapref, MDL); | |
4122 | if (data.data != NULL) | |
4123 | data_string_forget(&data, MDL); | |
9322442f | 4124 | if (reply->lease != NULL) |
1d17db44 | 4125 | iasubopt_dereference(&reply->lease, MDL); |
80c9fdb0 FD |
4126 | |
4127 | return status; | |
4128 | } | |
4129 | ||
4130 | /* | |
4131 | * Verify the prefix belongs to the client. If we've got a host | |
4132 | * record with fixed prefixes, it has to be an assigned prefix | |
4133 | * (fault out all else). Otherwise it's a dynamic prefix, so lookup | |
4134 | * that prefix and make sure it belongs to this DUID:IAID pair. | |
4135 | */ | |
4136 | static isc_boolean_t | |
4137 | prefix_is_owned(struct reply_state *reply, struct iaddrcidrnet *pref) { | |
4138 | struct iaddrcidrnetlist *l; | |
4139 | int i; | |
01fa619f | 4140 | struct ipv6_pond *pond; |
80c9fdb0 FD |
4141 | |
4142 | /* | |
4143 | * This faults out prefixes that don't match fixed prefixes. | |
4144 | */ | |
4145 | if (reply->static_prefixes > 0) { | |
4146 | for (l = reply->host->fixed_prefix; l != NULL; l = l->next) { | |
4147 | if ((pref->bits == l->cidrnet.bits) && | |
4148 | (memcmp(pref->lo_addr.iabuf, | |
4149 | l->cidrnet.lo_addr.iabuf, 16) == 0)) | |
bc7f8b8e | 4150 | return (ISC_TRUE); |
80c9fdb0 | 4151 | } |
bc7f8b8e | 4152 | return (ISC_FALSE); |
80c9fdb0 FD |
4153 | } |
4154 | ||
9322442f | 4155 | if ((reply->old_ia == NULL) || |
1d17db44 | 4156 | (reply->old_ia->num_iasubopt == 0)) |
bc7f8b8e | 4157 | return (ISC_FALSE); |
80c9fdb0 | 4158 | |
1d17db44 FD |
4159 | for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { |
4160 | struct iasubopt *tmp; | |
80c9fdb0 | 4161 | |
1d17db44 | 4162 | tmp = reply->old_ia->iasubopt[i]; |
80c9fdb0 FD |
4163 | |
4164 | if ((pref->bits == (int) tmp->plen) && | |
bc7f8b8e SR |
4165 | (memcmp(pref->lo_addr.iabuf, &tmp->addr, 16) == 0)) { |
4166 | if (lease6_usable(tmp) == ISC_FALSE) { | |
4167 | return (ISC_FALSE); | |
4168 | } | |
01fa619f SR |
4169 | |
4170 | pond = tmp->ipv6_pool->ipv6_pond; | |
4171 | if (((pond->prohibit_list != NULL) && | |
4172 | (permitted(reply->packet, pond->prohibit_list))) || | |
4173 | ((pond->permit_list != NULL) && | |
4174 | (!permitted(reply->packet, pond->permit_list)))) | |
4175 | return (ISC_FALSE); | |
4176 | ||
1d17db44 | 4177 | iasubopt_reference(&reply->lease, tmp, MDL); |
bc7f8b8e | 4178 | return (ISC_TRUE); |
80c9fdb0 FD |
4179 | } |
4180 | } | |
4181 | ||
bc7f8b8e | 4182 | return (ISC_FALSE); |
80c9fdb0 FD |
4183 | } |
4184 | ||
4185 | /* | |
4186 | * This function only returns failure on 'hard' failures. If it succeeds, | |
4187 | * it will leave a prefix structure behind. | |
4188 | */ | |
4189 | static isc_result_t | |
4190 | reply_process_try_prefix(struct reply_state *reply, | |
4191 | struct iaddrcidrnet *pref) { | |
d19fa5a1 | 4192 | isc_result_t status = ISC_R_ADDRNOTAVAIL; |
01fa619f SR |
4193 | struct ipv6_pool *pool = NULL; |
4194 | struct ipv6_pond *pond = NULL; | |
80c9fdb0 FD |
4195 | int i; |
4196 | struct data_string data_pref; | |
4197 | ||
bd72740e | 4198 | if ((reply == NULL) || (reply->shared == NULL) || |
d19fa5a1 SR |
4199 | (pref == NULL) || (reply->lease != NULL)) |
4200 | return (DHCP_R_INVALIDARG); | |
4201 | ||
01fa619f SR |
4202 | /* |
4203 | * Do a quick walk through of the ponds and pools | |
4204 | * to see if we have any prefix pools | |
4205 | */ | |
4206 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
4207 | if (pond->ipv6_pools == NULL) | |
4208 | continue; | |
4209 | ||
4210 | for (i = 0; (pool = pond->ipv6_pools[i]) != NULL; i++) { | |
4211 | if (pool->pool_type == D6O_IA_PD) | |
4212 | break; | |
4213 | } | |
4214 | if (pool != NULL) | |
4215 | break; | |
4216 | } | |
4217 | ||
4218 | /* If we get here and p is NULL we have no useful pools */ | |
4219 | if (pool == NULL) { | |
d19fa5a1 | 4220 | return (ISC_R_ADDRNOTAVAIL); |
01fa619f | 4221 | } |
80c9fdb0 FD |
4222 | |
4223 | memset(&data_pref, 0, sizeof(data_pref)); | |
4224 | data_pref.len = 17; | |
4225 | if (!buffer_allocate(&data_pref.buffer, data_pref.len, MDL)) { | |
4226 | log_error("reply_process_try_prefix: out of memory."); | |
d19fa5a1 | 4227 | return (ISC_R_NOMEMORY); |
80c9fdb0 FD |
4228 | } |
4229 | data_pref.data = data_pref.buffer->data; | |
4230 | data_pref.buffer->data[0] = (u_int8_t) pref->bits; | |
4231 | memcpy(data_pref.buffer->data + 1, pref->lo_addr.iabuf, 16); | |
4232 | ||
01fa619f SR |
4233 | /* |
4234 | * We have at least one pool that could provide a prefix | |
4235 | * Now we walk through the ponds and pools again and check | |
4236 | * to see if the client is permitted and if an prefix is | |
4237 | * available | |
4238 | * | |
4239 | */ | |
4240 | ||
4241 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
4242 | if (((pond->prohibit_list != NULL) && | |
4243 | (permitted(reply->packet, pond->prohibit_list))) || | |
4244 | ((pond->permit_list != NULL) && | |
4245 | (!permitted(reply->packet, pond->permit_list)))) | |
9322442f | 4246 | continue; |
01fa619f SR |
4247 | |
4248 | for (i = 0; (pool = pond->ipv6_pools[i]) != NULL; i++) { | |
4249 | if (pool->pool_type != D6O_IA_PD) { | |
4250 | continue; | |
4251 | } | |
4252 | ||
4253 | status = try_client_v6_prefix(&reply->lease, pool, | |
4254 | &data_pref); | |
4255 | /* If we found it in this pool (either in use or available), | |
4256 | there is no need to look further. */ | |
4257 | if ( (status == ISC_R_SUCCESS) || (status == ISC_R_ADDRINUSE) ) | |
4258 | break; | |
4259 | } | |
c7aa4dd4 | 4260 | if ( (status == ISC_R_SUCCESS) || (status == ISC_R_ADDRINUSE) ) |
80c9fdb0 FD |
4261 | break; |
4262 | } | |
4263 | ||
4264 | data_string_forget(&data_pref, MDL); | |
4265 | /* Return just the most recent status... */ | |
d19fa5a1 | 4266 | return (status); |
80c9fdb0 FD |
4267 | } |
4268 | ||
4269 | /* Look around for a prefix to give the client. First, look through the old | |
4270 | * IA_PD for prefixes we can extend. Second, try to allocate a new prefix. | |
4271 | * Finally, actually add that prefix into the current reply IA_PD. | |
4272 | */ | |
4273 | static isc_result_t | |
4274 | find_client_prefix(struct reply_state *reply) { | |
4275 | struct iaddrcidrnet send_pref; | |
4276 | isc_result_t status = ISC_R_NORESOURCES; | |
1d17db44 | 4277 | struct iasubopt *prefix, *best_prefix = NULL; |
80c9fdb0 | 4278 | struct binding_scope **scope; |
80c9fdb0 | 4279 | int i; |
01fa619f | 4280 | struct group *group; |
80c9fdb0 | 4281 | |
80c9fdb0 FD |
4282 | if (reply->static_prefixes > 0) { |
4283 | struct iaddrcidrnetlist *l; | |
4284 | ||
4285 | if (reply->host == NULL) | |
98bf1607 | 4286 | return DHCP_R_INVALIDARG; |
80c9fdb0 FD |
4287 | |
4288 | for (l = reply->host->fixed_prefix; l != NULL; l = l->next) { | |
4289 | if (l->cidrnet.bits == reply->preflen) | |
4290 | break; | |
4291 | } | |
4292 | if (l == NULL) { | |
4293 | /* | |
4294 | * If no fixed prefix has the preferred length, | |
4295 | * get the first one. | |
4296 | */ | |
4297 | l = reply->host->fixed_prefix; | |
4298 | } | |
4299 | memcpy(&send_pref, &l->cidrnet, sizeof(send_pref)); | |
4300 | ||
80c9fdb0 | 4301 | scope = &global_scope; |
01fa619f SR |
4302 | |
4303 | /* Find the static prefixe's subnet. */ | |
4304 | if (find_grouped_subnet(&reply->subnet, reply->shared, | |
4305 | send_pref.lo_addr, MDL) == 0) | |
4306 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4307 | group = reply->subnet->group; | |
4308 | subnet_dereference(&reply->subnet, MDL); | |
4309 | ||
d9b5c150 SR |
4310 | /* Copy the prefix for logging purposes */ |
4311 | memcpy(&reply->fixed_pref, &l->cidrnet, sizeof(send_pref)); | |
4312 | ||
80c9fdb0 FD |
4313 | goto send_pref; |
4314 | } | |
4315 | ||
9322442f | 4316 | if (reply->old_ia != NULL) { |
1d17db44 | 4317 | for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { |
0d8c3d6e | 4318 | struct shared_network *candidate_shared; |
01fa619f | 4319 | struct ipv6_pond *pond; |
0d8c3d6e | 4320 | |
1d17db44 | 4321 | prefix = reply->old_ia->iasubopt[i]; |
0d8c3d6e | 4322 | candidate_shared = prefix->ipv6_pool->shared_network; |
01fa619f | 4323 | pond = prefix->ipv6_pool->ipv6_pond; |
80c9fdb0 | 4324 | |
0d8c3d6e DH |
4325 | /* |
4326 | * Consider this prefix if it is in a global pool or | |
4327 | * if it is scoped in a pool under the client's shared | |
4328 | * network. | |
4329 | */ | |
01fa619f SR |
4330 | if (((candidate_shared != NULL) && |
4331 | (candidate_shared != reply->shared)) || | |
4332 | (lease6_usable(prefix) != ISC_TRUE)) | |
4333 | continue; | |
4334 | ||
4335 | /* | |
4336 | * And check if the prefix is still permitted | |
4337 | */ | |
4338 | ||
4339 | if (((pond->prohibit_list != NULL) && | |
4340 | (permitted(reply->packet, pond->prohibit_list))) || | |
4341 | ((pond->permit_list != NULL) && | |
4342 | (!permitted(reply->packet, pond->permit_list)))) | |
4343 | continue; | |
4344 | ||
4345 | best_prefix = prefix_compare(reply, prefix, | |
4346 | best_prefix); | |
80c9fdb0 FD |
4347 | } |
4348 | } | |
4349 | ||
4350 | /* Try to pick a new prefix if we didn't find one, or if we found an | |
4351 | * abandoned prefix. | |
4352 | */ | |
4353 | if ((best_prefix == NULL) || (best_prefix->state == FTS_ABANDONED)) { | |
01fa619f | 4354 | status = pick_v6_prefix(reply); |
80c9fdb0 | 4355 | } else if (best_prefix != NULL) { |
1d17db44 | 4356 | iasubopt_reference(&reply->lease, best_prefix, MDL); |
80c9fdb0 FD |
4357 | status = ISC_R_SUCCESS; |
4358 | } | |
4359 | ||
4360 | /* Pick the abandoned prefix as a last resort. */ | |
4361 | if ((status == ISC_R_NORESOURCES) && (best_prefix != NULL)) { | |
4362 | /* I don't see how this is supposed to be done right now. */ | |
4363 | log_error("Reclaiming abandoned prefixes is not yet " | |
4364 | "supported. Treating this as an out of space " | |
4365 | "condition."); | |
1d17db44 | 4366 | /* iasubopt_reference(&reply->lease, best_prefix, MDL); */ |
80c9fdb0 FD |
4367 | } |
4368 | ||
4369 | /* Give up now if we didn't find a prefix. */ | |
4370 | if (status != ISC_R_SUCCESS) | |
5279b8f3 DH |
4371 | return status; |
4372 | ||
9322442f | 4373 | if (reply->lease == NULL) |
5279b8f3 DH |
4374 | log_fatal("Impossible condition at %s:%d.", MDL); |
4375 | ||
9322442f | 4376 | scope = &reply->lease->scope; |
01fa619f | 4377 | group = reply->lease->ipv6_pool->ipv6_pond->group; |
5279b8f3 | 4378 | |
80c9fdb0 | 4379 | send_pref.lo_addr.len = 16; |
9322442f FD |
4380 | memcpy(send_pref.lo_addr.iabuf, &reply->lease->addr, 16); |
4381 | send_pref.bits = (int) reply->lease->plen; | |
5279b8f3 | 4382 | |
80c9fdb0 | 4383 | send_pref: |
01fa619f | 4384 | status = reply_process_is_prefixed(reply, scope, group); |
5279b8f3 DH |
4385 | if (status != ISC_R_SUCCESS) |
4386 | return status; | |
4387 | ||
80c9fdb0 | 4388 | status = reply_process_send_prefix(reply, &send_pref); |
5279b8f3 DH |
4389 | return status; |
4390 | } | |
4391 | ||
80c9fdb0 FD |
4392 | /* Once a prefix is found for a client, perform several common functions; |
4393 | * Calculate and store valid and preferred prefix times, draw client options | |
5279b8f3 DH |
4394 | * into the option state. |
4395 | */ | |
4396 | static isc_result_t | |
9322442f | 4397 | reply_process_is_prefixed(struct reply_state *reply, |
80c9fdb0 | 4398 | struct binding_scope **scope, struct group *group) |
5279b8f3 DH |
4399 | { |
4400 | isc_result_t status = ISC_R_SUCCESS; | |
4401 | struct data_string data; | |
4402 | struct option_cache *oc; | |
a7341359 SR |
4403 | struct option_state *tmp_options = NULL; |
4404 | struct on_star *on_star; | |
01fa619f | 4405 | int i; |
5279b8f3 DH |
4406 | |
4407 | /* Initialize values we will cleanup. */ | |
4408 | memset(&data, 0, sizeof(data)); | |
4409 | ||
a7341359 SR |
4410 | /* |
4411 | * Find the proper on_star block to use. We use the | |
4412 | * one in the lease if we have a lease or the one in | |
4413 | * the reply if we don't have a lease because this is | |
4414 | * a static instance | |
4415 | */ | |
4416 | if (reply->lease) { | |
4417 | on_star = &reply->lease->on_star; | |
4418 | } else { | |
4419 | on_star = &reply->on_star; | |
4420 | } | |
4421 | ||
4422 | /* | |
4423 | * Bring in the root configuration. We only do this to bring | |
4424 | * in the on * statements, as we didn't have the lease available | |
4425 | * we we did it the first time. | |
4426 | */ | |
4427 | option_state_allocate(&tmp_options, MDL); | |
4428 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4429 | reply->packet->options, tmp_options, | |
4430 | &global_scope, root_group, NULL, | |
4431 | on_star); | |
4432 | if (tmp_options != NULL) { | |
4433 | option_state_dereference(&tmp_options, MDL); | |
4434 | } | |
4435 | ||
2267da84 DH |
4436 | /* |
4437 | * Bring configured options into the root packet level cache - start | |
4438 | * with the lease's closest enclosing group (passed in by the caller | |
4439 | * as 'group'). | |
4440 | */ | |
5279b8f3 DH |
4441 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, |
4442 | reply->packet->options, reply->opt_state, | |
a7341359 | 4443 | scope, group, root_group, on_star); |
5279b8f3 | 4444 | |
01fa619f SR |
4445 | /* Execute statements from class scopes. */ |
4446 | for (i = reply->packet->class_count; i > 0; i--) { | |
4447 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4448 | reply->packet->options, | |
4449 | reply->opt_state, scope, | |
4450 | reply->packet->classes[i - 1]->group, | |
4451 | group, on_star); | |
4452 | } | |
4453 | ||
2267da84 DH |
4454 | /* |
4455 | * If there is a host record, over-ride with values configured there, | |
4456 | * without re-evaluating configuration from the previously executed | |
4457 | * group or its common enclosers. | |
4458 | */ | |
4459 | if (reply->host != NULL) | |
4460 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4461 | reply->packet->options, | |
4462 | reply->opt_state, scope, | |
a7341359 SR |
4463 | reply->host->group, group, |
4464 | on_star); | |
2267da84 | 4465 | |
5279b8f3 DH |
4466 | /* Determine valid lifetime. */ |
4467 | if (reply->client_valid == 0) | |
4468 | reply->send_valid = DEFAULT_DEFAULT_LEASE_TIME; | |
4469 | else | |
4470 | reply->send_valid = reply->client_valid; | |
4471 | ||
4472 | oc = lookup_option(&server_universe, reply->opt_state, | |
4473 | SV_DEFAULT_LEASE_TIME); | |
4474 | if (oc != NULL) { | |
b024480e | 4475 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, |
5279b8f3 DH |
4476 | reply->packet->options, |
4477 | reply->opt_state, | |
b024480e | 4478 | scope, oc, MDL) || |
5279b8f3 | 4479 | (data.len != 4)) { |
80c9fdb0 FD |
4480 | log_error("reply_process_is_prefixed: unable to " |
4481 | "evaluate default prefix time"); | |
5279b8f3 DH |
4482 | status = ISC_R_FAILURE; |
4483 | goto cleanup; | |
4484 | } | |
4485 | ||
4486 | reply->send_valid = getULong(data.data); | |
4487 | data_string_forget(&data, MDL); | |
98bd7ca0 | 4488 | } |
5279b8f3 DH |
4489 | |
4490 | if (reply->client_prefer == 0) | |
4491 | reply->send_prefer = reply->send_valid; | |
4492 | else | |
4493 | reply->send_prefer = reply->client_prefer; | |
4494 | ||
4495 | if (reply->send_prefer >= reply->send_valid) | |
4496 | reply->send_prefer = (reply->send_valid / 2) + | |
4497 | (reply->send_valid / 8); | |
4498 | ||
4499 | oc = lookup_option(&server_universe, reply->opt_state, | |
4500 | SV_PREFER_LIFETIME); | |
4501 | if (oc != NULL) { | |
b024480e | 4502 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, |
5279b8f3 DH |
4503 | reply->packet->options, |
4504 | reply->opt_state, | |
b024480e | 4505 | scope, oc, MDL) || |
5279b8f3 | 4506 | (data.len != 4)) { |
80c9fdb0 FD |
4507 | log_error("reply_process_is_prefixed: unable to " |
4508 | "evaluate preferred prefix time"); | |
5279b8f3 DH |
4509 | status = ISC_R_FAILURE; |
4510 | goto cleanup; | |
4511 | } | |
4512 | ||
4513 | reply->send_prefer = getULong(data.data); | |
4514 | data_string_forget(&data, MDL); | |
98bd7ca0 | 4515 | } |
5279b8f3 DH |
4516 | |
4517 | /* Note lowest values for later calculation of renew/rebind times. */ | |
4518 | if (reply->prefer > reply->send_prefer) | |
4519 | reply->prefer = reply->send_prefer; | |
4520 | ||
4521 | if (reply->valid > reply->send_valid) | |
4522 | reply->valid = reply->send_valid; | |
4523 | ||
80c9fdb0 | 4524 | /* Perform dynamic prefix related update work. */ |
9322442f | 4525 | if (reply->lease != NULL) { |
1acab09f FD |
4526 | /* Cached lifetimes */ |
4527 | reply->lease->prefer = reply->send_prefer; | |
4528 | reply->lease->valid = reply->send_valid; | |
4529 | ||
5279b8f3 | 4530 | /* Advance (or rewind) the valid lifetime. */ |
5d89d60f | 4531 | if (reply->buf.reply.msg_type == DHCPV6_REPLY) { |
9322442f | 4532 | reply->lease->soft_lifetime_end_time = |
5d89d60f FD |
4533 | cur_time + reply->send_valid; |
4534 | /* Wait before renew! */ | |
4535 | } | |
5279b8f3 | 4536 | |
1d17db44 | 4537 | status = ia_add_iasubopt(reply->ia, reply->lease, MDL); |
5279b8f3 | 4538 | if (status != ISC_R_SUCCESS) { |
80c9fdb0 FD |
4539 | log_fatal("reply_process_is_prefixed: Unable to " |
4540 | "attach prefix to new IA_PD: %s", | |
4541 | isc_result_totext(status)); | |
5279b8f3 DH |
4542 | } |
4543 | ||
4544 | /* | |
80c9fdb0 | 4545 | * If this is a new prefix, make sure it is attached somewhere. |
5279b8f3 | 4546 | */ |
9322442f FD |
4547 | if (reply->lease->ia == NULL) { |
4548 | ia_reference(&reply->lease->ia, reply->ia, MDL); | |
5279b8f3 | 4549 | } |
98bd7ca0 | 4550 | } |
5279b8f3 | 4551 | |
80c9fdb0 | 4552 | /* Bring a copy of the relevant options into the IA_PD scope. */ |
5279b8f3 DH |
4553 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, |
4554 | reply->packet->options, reply->reply_ia, | |
a7341359 | 4555 | scope, group, root_group, NULL); |
5279b8f3 | 4556 | |
01fa619f SR |
4557 | /* Execute statements from class scopes. */ |
4558 | for (i = reply->packet->class_count; i > 0; i--) { | |
4559 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4560 | reply->packet->options, | |
4561 | reply->reply_ia, scope, | |
4562 | reply->packet->classes[i - 1]->group, | |
4563 | group, NULL); | |
4564 | } | |
4565 | ||
2267da84 DH |
4566 | /* |
4567 | * And bring in host record configuration, if any, but not to overlap | |
4568 | * the previous group or its common enclosers. | |
4569 | */ | |
4570 | if (reply->host != NULL) | |
4571 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4572 | reply->packet->options, | |
4573 | reply->reply_ia, scope, | |
a7341359 | 4574 | reply->host->group, group, NULL); |
2267da84 | 4575 | |
5279b8f3 DH |
4576 | cleanup: |
4577 | if (data.data != NULL) | |
4578 | data_string_forget(&data, MDL); | |
4579 | ||
4580 | if (status == ISC_R_SUCCESS) | |
1d9774ab | 4581 | reply->client_resources++; |
5279b8f3 DH |
4582 | |
4583 | return status; | |
4584 | } | |
4585 | ||
80c9fdb0 | 4586 | /* Simply send an IAPREFIX within the IA_PD scope as described. */ |
5279b8f3 | 4587 | static isc_result_t |
80c9fdb0 FD |
4588 | reply_process_send_prefix(struct reply_state *reply, |
4589 | struct iaddrcidrnet *pref) { | |
5279b8f3 DH |
4590 | isc_result_t status = ISC_R_SUCCESS; |
4591 | struct data_string data; | |
4592 | ||
4593 | memset(&data, 0, sizeof(data)); | |
4594 | ||
80c9fdb0 FD |
4595 | /* Now append the prefix. */ |
4596 | data.len = IAPREFIX_OFFSET; | |
5279b8f3 | 4597 | if (!buffer_allocate(&data.buffer, data.len, MDL)) { |
80c9fdb0 FD |
4598 | log_error("reply_process_send_prefix: out of memory" |
4599 | "allocating new IAPREFIX buffer."); | |
5279b8f3 DH |
4600 | status = ISC_R_NOMEMORY; |
4601 | goto cleanup; | |
98bd7ca0 | 4602 | } |
5279b8f3 DH |
4603 | data.data = data.buffer->data; |
4604 | ||
80c9fdb0 FD |
4605 | putULong(data.buffer->data, reply->send_prefer); |
4606 | putULong(data.buffer->data + 4, reply->send_valid); | |
4607 | data.buffer->data[8] = pref->bits; | |
4608 | memcpy(data.buffer->data + 9, pref->lo_addr.iabuf, 16); | |
5279b8f3 | 4609 | |
bead14ea DH |
4610 | if (!append_option_buffer(&dhcpv6_universe, reply->reply_ia, |
4611 | data.buffer, data.buffer->data, | |
80c9fdb0 FD |
4612 | data.len, D6O_IAPREFIX, 0)) { |
4613 | log_error("reply_process_send_prefix: unable " | |
4614 | "to save IAPREFIX option"); | |
5279b8f3 DH |
4615 | status = ISC_R_FAILURE; |
4616 | goto cleanup; | |
4617 | } | |
4618 | ||
9322442f | 4619 | reply->resources_included = ISC_TRUE; |
9f1d5a2f | 4620 | |
5279b8f3 DH |
4621 | cleanup: |
4622 | if (data.data != NULL) | |
4623 | data_string_forget(&data, MDL); | |
4624 | ||
4625 | return status; | |
4626 | } | |
4627 | ||
80c9fdb0 | 4628 | /* Choose the better of two prefixes. */ |
1d17db44 | 4629 | static struct iasubopt * |
80c9fdb0 | 4630 | prefix_compare(struct reply_state *reply, |
1d17db44 | 4631 | struct iasubopt *alpha, struct iasubopt *beta) { |
5279b8f3 DH |
4632 | if (alpha == NULL) |
4633 | return beta; | |
4634 | if (beta == NULL) | |
4635 | return alpha; | |
4636 | ||
80c9fdb0 FD |
4637 | if (reply->preflen >= 0) { |
4638 | if ((alpha->plen == reply->preflen) && | |
4639 | (beta->plen != reply->preflen)) | |
4640 | return alpha; | |
4641 | if ((beta->plen == reply->preflen) && | |
4642 | (alpha->plen != reply->preflen)) | |
4643 | return beta; | |
4644 | } | |
4645 | ||
5279b8f3 DH |
4646 | switch(alpha->state) { |
4647 | case FTS_ACTIVE: | |
4648 | switch(beta->state) { | |
4649 | case FTS_ACTIVE: | |
80c9fdb0 | 4650 | /* Choose the prefix with the longest lifetime (most |
5279b8f3 DH |
4651 | * likely the most recently allocated). |
4652 | */ | |
5d89d60f FD |
4653 | if (alpha->hard_lifetime_end_time < |
4654 | beta->hard_lifetime_end_time) | |
5279b8f3 DH |
4655 | return beta; |
4656 | else | |
4657 | return alpha; | |
4658 | ||
4659 | case FTS_EXPIRED: | |
4660 | case FTS_ABANDONED: | |
4661 | return alpha; | |
4662 | ||
4663 | default: | |
4664 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4665 | } | |
4666 | break; | |
4667 | ||
4668 | case FTS_EXPIRED: | |
4669 | switch (beta->state) { | |
4670 | case FTS_ACTIVE: | |
4671 | return beta; | |
4672 | ||
4673 | case FTS_EXPIRED: | |
80c9fdb0 | 4674 | /* Choose the most recently expired prefix. */ |
5d89d60f FD |
4675 | if (alpha->hard_lifetime_end_time < |
4676 | beta->hard_lifetime_end_time) | |
4677 | return beta; | |
4678 | else if ((alpha->hard_lifetime_end_time == | |
4679 | beta->hard_lifetime_end_time) && | |
4680 | (alpha->soft_lifetime_end_time < | |
4681 | beta->soft_lifetime_end_time)) | |
5279b8f3 DH |
4682 | return beta; |
4683 | else | |
4684 | return alpha; | |
4685 | ||
4686 | case FTS_ABANDONED: | |
4687 | return alpha; | |
4688 | ||
4689 | default: | |
4690 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4691 | } | |
4692 | break; | |
4693 | ||
4694 | case FTS_ABANDONED: | |
4695 | switch (beta->state) { | |
4696 | case FTS_ACTIVE: | |
4697 | case FTS_EXPIRED: | |
4698 | return alpha; | |
4699 | ||
4700 | case FTS_ABANDONED: | |
80c9fdb0 | 4701 | /* Choose the prefix that was abandoned longest ago. */ |
5d89d60f FD |
4702 | if (alpha->hard_lifetime_end_time < |
4703 | beta->hard_lifetime_end_time) | |
5279b8f3 | 4704 | return alpha; |
a07d99bb TM |
4705 | else |
4706 | return beta; | |
5279b8f3 DH |
4707 | |
4708 | default: | |
4709 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4710 | } | |
4711 | break; | |
4712 | ||
4713 | default: | |
4714 | log_fatal("Impossible condition at %s:%d.", MDL); | |
98bd7ca0 | 4715 | } |
5279b8f3 DH |
4716 | |
4717 | log_fatal("Triple impossible condition at %s:%d.", MDL); | |
4718 | return NULL; | |
98bd7ca0 DH |
4719 | } |
4720 | ||
4721 | /* | |
4722 | * Solicit is how a client starts requesting addresses. | |
4723 | * | |
4724 | * If the client asks for rapid commit, and we support it, we will | |
4725 | * allocate the addresses and reply. | |
4726 | * | |
4727 | * Otherwise we will send an advertise message. | |
4728 | */ | |
4729 | ||
98bd7ca0 DH |
4730 | static void |
4731 | dhcpv6_solicit(struct data_string *reply_ret, struct packet *packet) { | |
4732 | struct data_string client_id; | |
98bd7ca0 DH |
4733 | |
4734 | /* | |
4735 | * Validate our input. | |
4736 | */ | |
4737 | if (!valid_client_msg(packet, &client_id)) { | |
4738 | return; | |
4739 | } | |
4740 | ||
4741 | lease_to_client(reply_ret, packet, &client_id, NULL); | |
4742 | ||
4743 | /* | |
4744 | * Clean up. | |
4745 | */ | |
4746 | data_string_forget(&client_id, MDL); | |
4747 | } | |
4748 | ||
4749 | /* | |
4750 | * Request is how a client actually requests addresses. | |
4751 | * | |
4752 | * Very similar to Solicit handling, except the server DUID is required. | |
4753 | */ | |
4754 | ||
72073970 | 4755 | /* TODO: reject unicast messages, unless we set unicast option */ |
98bd7ca0 DH |
4756 | static void |
4757 | dhcpv6_request(struct data_string *reply_ret, struct packet *packet) { | |
4758 | struct data_string client_id; | |
4759 | struct data_string server_id; | |
4760 | ||
4761 | /* | |
4762 | * Validate our input. | |
4763 | */ | |
4764 | if (!valid_client_resp(packet, &client_id, &server_id)) { | |
4765 | return; | |
4766 | } | |
4767 | ||
4768 | /* | |
4769 | * Issue our lease. | |
4770 | */ | |
4771 | lease_to_client(reply_ret, packet, &client_id, &server_id); | |
4772 | ||
4773 | /* | |
4774 | * Cleanup. | |
4775 | */ | |
4776 | data_string_forget(&client_id, MDL); | |
4777 | data_string_forget(&server_id, MDL); | |
4778 | } | |
4779 | ||
8eab95f2 DH |
4780 | /* Find a DHCPv6 packet's shared network from hints in the packet. |
4781 | */ | |
bd72740e | 4782 | static isc_result_t |
8eab95f2 DH |
4783 | shared_network_from_packet6(struct shared_network **shared, |
4784 | struct packet *packet) | |
4785 | { | |
4786 | const struct packet *chk_packet; | |
4787 | const struct in6_addr *link_addr, *first_link_addr; | |
4788 | struct iaddr tmp_addr; | |
4789 | struct subnet *subnet; | |
bd72740e | 4790 | isc_result_t status; |
8eab95f2 | 4791 | |
bd72740e | 4792 | if ((shared == NULL) || (*shared != NULL) || (packet == NULL)) |
98bf1607 | 4793 | return DHCP_R_INVALIDARG; |
8eab95f2 DH |
4794 | |
4795 | /* | |
4796 | * First, find the link address where the packet from the client | |
4797 | * first appeared (if this packet was relayed). | |
4798 | */ | |
4799 | first_link_addr = NULL; | |
4800 | chk_packet = packet->dhcpv6_container_packet; | |
4801 | while (chk_packet != NULL) { | |
4802 | link_addr = &chk_packet->dhcpv6_link_address; | |
4803 | if (!IN6_IS_ADDR_UNSPECIFIED(link_addr) && | |
4804 | !IN6_IS_ADDR_LINKLOCAL(link_addr)) { | |
4805 | first_link_addr = link_addr; | |
b445a411 | 4806 | break; |
8eab95f2 DH |
4807 | } |
4808 | chk_packet = chk_packet->dhcpv6_container_packet; | |
4809 | } | |
4810 | ||
4811 | /* | |
4812 | * If there is a relayed link address, find the subnet associated | |
4813 | * with that, and use that to get the appropriate | |
4814 | * shared_network. | |
4815 | */ | |
4816 | if (first_link_addr != NULL) { | |
4817 | tmp_addr.len = sizeof(*first_link_addr); | |
4818 | memcpy(tmp_addr.iabuf, | |
4819 | first_link_addr, sizeof(*first_link_addr)); | |
4820 | subnet = NULL; | |
4821 | if (!find_subnet(&subnet, tmp_addr, MDL)) { | |
4822 | log_debug("No subnet found for link-address %s.", | |
4823 | piaddr(tmp_addr)); | |
bd72740e | 4824 | return ISC_R_NOTFOUND; |
8eab95f2 | 4825 | } |
bd72740e FD |
4826 | status = shared_network_reference(shared, |
4827 | subnet->shared_network, MDL); | |
8eab95f2 DH |
4828 | subnet_dereference(&subnet, MDL); |
4829 | ||
4830 | /* | |
4831 | * If there is no link address, we will use the interface | |
4832 | * that this packet came in on to pick the shared_network. | |
4833 | */ | |
4dc5a6b1 | 4834 | } else if (packet->interface != NULL) { |
bd72740e | 4835 | status = shared_network_reference(shared, |
8eab95f2 DH |
4836 | packet->interface->shared_network, |
4837 | MDL); | |
4dc5a6b1 SR |
4838 | if (packet->dhcpv6_container_packet != NULL) { |
4839 | log_info("[L2 Relay] No link address in relay packet " | |
4840 | "assuming L2 relay and using receiving " | |
4841 | "interface"); | |
4842 | } | |
4843 | ||
4844 | } else { | |
4845 | /* | |
4846 | * We shouldn't be able to get here but if there is no link | |
4847 | * address and no interface we don't know where to get the | |
4848 | * pool from log an error and return an error. | |
4849 | */ | |
4850 | log_error("No interface and no link address " | |
4851 | "can't determine pool"); | |
4852 | status = DHCP_R_INVALIDARG; | |
8eab95f2 | 4853 | } |
bd72740e FD |
4854 | |
4855 | return status; | |
8eab95f2 DH |
4856 | } |
4857 | ||
98bd7ca0 DH |
4858 | /* |
4859 | * When a client thinks it might be on a new link, it sends a | |
4860 | * Confirm message. | |
8eab95f2 DH |
4861 | * |
4862 | * From RFC3315 section 18.2.2: | |
4863 | * | |
4864 | * When the server receives a Confirm message, the server determines | |
4865 | * whether the addresses in the Confirm message are appropriate for the | |
4866 | * link to which the client is attached. If all of the addresses in the | |
4867 | * Confirm message pass this test, the server returns a status of | |
4868 | * Success. If any of the addresses do not pass this test, the server | |
4869 | * returns a status of NotOnLink. If the server is unable to perform | |
4870 | * this test (for example, the server does not have information about | |
4871 | * prefixes on the link to which the client is connected), or there were | |
4872 | * no addresses in any of the IAs sent by the client, the server MUST | |
4873 | * NOT send a reply to the client. | |
98bd7ca0 DH |
4874 | */ |
4875 | ||
98bd7ca0 DH |
4876 | static void |
4877 | dhcpv6_confirm(struct data_string *reply_ret, struct packet *packet) { | |
8eab95f2 DH |
4878 | struct shared_network *shared; |
4879 | struct subnet *subnet; | |
4880 | struct option_cache *ia, *ta, *oc; | |
4881 | struct data_string cli_enc_opt_data, iaaddr, client_id, packet_oro; | |
4882 | struct option_state *cli_enc_opt_state, *opt_state; | |
4883 | struct iaddr cli_addr; | |
4884 | int pass; | |
4885 | isc_boolean_t inappropriate, has_addrs; | |
98bd7ca0 DH |
4886 | char reply_data[65536]; |
4887 | struct dhcpv6_packet *reply = (struct dhcpv6_packet *)reply_data; | |
a3528574 | 4888 | int reply_ofs = (int)(offsetof(struct dhcpv6_packet, options)); |
98bd7ca0 DH |
4889 | |
4890 | /* | |
8eab95f2 | 4891 | * Basic client message validation. |
98bd7ca0 | 4892 | */ |
8eab95f2 | 4893 | memset(&client_id, 0, sizeof(client_id)); |
98bd7ca0 DH |
4894 | if (!valid_client_msg(packet, &client_id)) { |
4895 | return; | |
4896 | } | |
4897 | ||
80c9fdb0 FD |
4898 | /* |
4899 | * Do not process Confirms that do not have IA's we do not recognize. | |
8eab95f2 DH |
4900 | */ |
4901 | ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); | |
4902 | ta = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); | |
4903 | if ((ia == NULL) && (ta == NULL)) | |
4904 | return; | |
4905 | ||
80c9fdb0 FD |
4906 | /* |
4907 | * IA_PD's are simply ignored. | |
4908 | */ | |
4909 | delete_option(&dhcpv6_universe, packet->options, D6O_IA_PD); | |
4910 | ||
98bd7ca0 DH |
4911 | /* |
4912 | * Bit of variable initialization. | |
4913 | */ | |
8eab95f2 DH |
4914 | opt_state = cli_enc_opt_state = NULL; |
4915 | memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); | |
98bd7ca0 | 4916 | memset(&iaaddr, 0, sizeof(iaaddr)); |
98bd7ca0 DH |
4917 | memset(&packet_oro, 0, sizeof(packet_oro)); |
4918 | ||
8eab95f2 DH |
4919 | /* Determine what shared network the client is connected to. We |
4920 | * must not respond if we don't have any information about the | |
4921 | * network the client is on. | |
98bd7ca0 | 4922 | */ |
8eab95f2 | 4923 | shared = NULL; |
bd72740e FD |
4924 | if ((shared_network_from_packet6(&shared, packet) != ISC_R_SUCCESS) || |
4925 | (shared == NULL)) | |
98bd7ca0 | 4926 | goto exit; |
98bd7ca0 | 4927 | |
8eab95f2 DH |
4928 | /* If there are no recorded subnets, then we have no |
4929 | * information about this subnet - ignore Confirms. | |
98bd7ca0 | 4930 | */ |
8eab95f2 DH |
4931 | subnet = shared->subnets; |
4932 | if (subnet == NULL) | |
4933 | goto exit; | |
98bd7ca0 | 4934 | |
8eab95f2 DH |
4935 | /* Are the addresses in all the IA's appropriate for that link? */ |
4936 | has_addrs = inappropriate = ISC_FALSE; | |
4937 | pass = D6O_IA_NA; | |
4938 | while(!inappropriate) { | |
4939 | /* If we've reached the end of the IA_NA pass, move to the | |
4940 | * IA_TA pass. | |
4941 | */ | |
4942 | if ((pass == D6O_IA_NA) && (ia == NULL)) { | |
4943 | pass = D6O_IA_TA; | |
4944 | ia = ta; | |
98bd7ca0 DH |
4945 | } |
4946 | ||
8eab95f2 DH |
4947 | /* If we've reached the end of all passes, we're done. */ |
4948 | if (ia == NULL) | |
4949 | break; | |
98bd7ca0 | 4950 | |
8eab95f2 DH |
4951 | if (((pass == D6O_IA_NA) && |
4952 | !get_encapsulated_IA_state(&cli_enc_opt_state, | |
4953 | &cli_enc_opt_data, | |
4954 | packet, ia, IA_NA_OFFSET)) || | |
4955 | ((pass == D6O_IA_TA) && | |
4956 | !get_encapsulated_IA_state(&cli_enc_opt_state, | |
4957 | &cli_enc_opt_data, | |
4958 | packet, ia, IA_TA_OFFSET))) { | |
98bd7ca0 DH |
4959 | goto exit; |
4960 | } | |
4961 | ||
8eab95f2 DH |
4962 | oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, |
4963 | D6O_IAADDR); | |
98bd7ca0 | 4964 | |
8eab95f2 DH |
4965 | for ( ; oc != NULL ; oc = oc->next) { |
4966 | if (!evaluate_option_cache(&iaaddr, packet, NULL, NULL, | |
4967 | packet->options, NULL, | |
4968 | &global_scope, oc, MDL) || | |
5279b8f3 | 4969 | (iaaddr.len < IAADDR_OFFSET)) { |
8eab95f2 DH |
4970 | log_error("dhcpv6_confirm: " |
4971 | "error evaluating IAADDR."); | |
98bd7ca0 DH |
4972 | goto exit; |
4973 | } | |
8eab95f2 DH |
4974 | |
4975 | /* Copy out the IPv6 address for processing. */ | |
4976 | cli_addr.len = 16; | |
4977 | memcpy(cli_addr.iabuf, iaaddr.data, 16); | |
4978 | ||
5279b8f3 DH |
4979 | data_string_forget(&iaaddr, MDL); |
4980 | ||
8eab95f2 DH |
4981 | /* Record that we've processed at least one address. */ |
4982 | has_addrs = ISC_TRUE; | |
4983 | ||
4984 | /* Find out if any subnets cover this address. */ | |
4985 | for (subnet = shared->subnets ; subnet != NULL ; | |
4986 | subnet = subnet->next_sibling) { | |
4987 | if (addr_eq(subnet_number(cli_addr, | |
4988 | subnet->netmask), | |
4989 | subnet->net)) | |
4990 | break; | |
4991 | } | |
4992 | ||
8eab95f2 DH |
4993 | /* If we reach the end of the subnet list, and no |
4994 | * subnet matches the client address, then it must | |
4995 | * be inappropriate to the link (so far as our | |
4996 | * configuration says). Once we've found one | |
4997 | * inappropriate address, there is no reason to | |
4998 | * continue searching. | |
4999 | */ | |
5000 | if (subnet == NULL) { | |
5001 | inappropriate = ISC_TRUE; | |
98bd7ca0 DH |
5002 | break; |
5003 | } | |
5279b8f3 | 5004 | } |
98bd7ca0 | 5005 | |
8eab95f2 DH |
5006 | option_state_dereference(&cli_enc_opt_state, MDL); |
5007 | data_string_forget(&cli_enc_opt_data, MDL); | |
98bd7ca0 | 5008 | |
8eab95f2 DH |
5009 | /* Advance to the next IA_*. */ |
5010 | ia = ia->next; | |
98bd7ca0 DH |
5011 | } |
5012 | ||
8eab95f2 DH |
5013 | /* If the client supplied no addresses, do not reply. */ |
5014 | if (!has_addrs) | |
5015 | goto exit; | |
5016 | ||
98bd7ca0 | 5017 | /* |
8eab95f2 | 5018 | * Set up reply. |
98bd7ca0 | 5019 | */ |
8eab95f2 | 5020 | if (!start_reply(packet, &client_id, NULL, &opt_state, reply)) { |
98bd7ca0 DH |
5021 | goto exit; |
5022 | } | |
5023 | ||
5024 | /* | |
5025 | * Set our status. | |
5026 | */ | |
8eab95f2 | 5027 | if (inappropriate) { |
98bd7ca0 DH |
5028 | if (!set_status_code(STATUS_NotOnLink, |
5029 | "Some of the addresses are not on link.", | |
5030 | opt_state)) { | |
5031 | goto exit; | |
5032 | } | |
5033 | } else { | |
5034 | if (!set_status_code(STATUS_Success, | |
5035 | "All addresses still on link.", | |
5036 | opt_state)) { | |
5037 | goto exit; | |
5038 | } | |
5039 | } | |
5040 | ||
5041 | /* | |
5042 | * Only one option: add it. | |
5043 | */ | |
5044 | reply_ofs += store_options6(reply_data+reply_ofs, | |
5045 | sizeof(reply_data)-reply_ofs, | |
5046 | opt_state, packet, | |
5047 | required_opts, &packet_oro); | |
5048 | ||
5049 | /* | |
5050 | * Return our reply to the caller. | |
5051 | */ | |
5052 | reply_ret->len = reply_ofs; | |
5053 | reply_ret->buffer = NULL; | |
5054 | if (!buffer_allocate(&reply_ret->buffer, reply_ofs, MDL)) { | |
5055 | log_fatal("No memory to store reply."); | |
5056 | } | |
5057 | reply_ret->data = reply_ret->buffer->data; | |
5058 | memcpy(reply_ret->buffer->data, reply, reply_ofs); | |
5059 | ||
5060 | exit: | |
8eab95f2 DH |
5061 | /* Cleanup any stale data strings. */ |
5062 | if (cli_enc_opt_data.buffer != NULL) | |
5063 | data_string_forget(&cli_enc_opt_data, MDL); | |
5064 | if (iaaddr.buffer != NULL) | |
98bd7ca0 | 5065 | data_string_forget(&iaaddr, MDL); |
8eab95f2 DH |
5066 | if (client_id.buffer != NULL) |
5067 | data_string_forget(&client_id, MDL); | |
5068 | if (packet_oro.buffer != NULL) | |
5069 | data_string_forget(&packet_oro, MDL); | |
5070 | ||
5071 | /* Release any stale option states. */ | |
5072 | if (cli_enc_opt_state != NULL) | |
5073 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5074 | if (opt_state != NULL) | |
5075 | option_state_dereference(&opt_state, MDL); | |
98bd7ca0 DH |
5076 | } |
5077 | ||
5078 | /* | |
80c9fdb0 | 5079 | * Renew is when a client wants to extend its lease/prefix, at time T1. |
98bd7ca0 | 5080 | * |
80c9fdb0 FD |
5081 | * We handle this the same as if the client wants a new lease/prefix, |
5082 | * except for the error code of when addresses don't match. | |
98bd7ca0 DH |
5083 | */ |
5084 | ||
72073970 | 5085 | /* TODO: reject unicast messages, unless we set unicast option */ |
98bd7ca0 DH |
5086 | static void |
5087 | dhcpv6_renew(struct data_string *reply, struct packet *packet) { | |
5088 | struct data_string client_id; | |
5089 | struct data_string server_id; | |
5090 | ||
5091 | /* | |
5092 | * Validate the request. | |
5093 | */ | |
5094 | if (!valid_client_resp(packet, &client_id, &server_id)) { | |
5095 | return; | |
5096 | } | |
5097 | ||
5098 | /* | |
5099 | * Renew our lease. | |
5100 | */ | |
5101 | lease_to_client(reply, packet, &client_id, &server_id); | |
5102 | ||
5103 | /* | |
5104 | * Cleanup. | |
5105 | */ | |
5106 | data_string_forget(&server_id, MDL); | |
5107 | data_string_forget(&client_id, MDL); | |
5108 | } | |
5109 | ||
5110 | /* | |
5111 | * Rebind is when a client wants to extend its lease, at time T2. | |
5112 | * | |
5113 | * We handle this the same as if the client wants a new lease, except | |
5114 | * for the error code of when addresses don't match. | |
5115 | */ | |
5116 | ||
98bd7ca0 DH |
5117 | static void |
5118 | dhcpv6_rebind(struct data_string *reply, struct packet *packet) { | |
5119 | struct data_string client_id; | |
5120 | ||
5121 | if (!valid_client_msg(packet, &client_id)) { | |
5122 | return; | |
5123 | } | |
5124 | ||
5279b8f3 | 5125 | lease_to_client(reply, packet, &client_id, NULL); |
98bd7ca0 DH |
5126 | |
5127 | data_string_forget(&client_id, MDL); | |
5128 | } | |
5129 | ||
5130 | static void | |
5131 | ia_na_match_decline(const struct data_string *client_id, | |
5132 | const struct data_string *iaaddr, | |
1d17db44 | 5133 | struct iasubopt *lease) |
c382bc98 | 5134 | { |
98bd7ca0 DH |
5135 | char tmp_addr[INET6_ADDRSTRLEN]; |
5136 | ||
5137 | log_error("Client %s reports address %s is " | |
5138 | "already in use by another host!", | |
5139 | print_hex_1(client_id->len, client_id->data, 60), | |
5140 | inet_ntop(AF_INET6, iaaddr->data, | |
5141 | tmp_addr, sizeof(tmp_addr))); | |
5142 | if (lease != NULL) { | |
5143 | decline_lease6(lease->ipv6_pool, lease); | |
1acab09f | 5144 | lease->ia->cltt = cur_time; |
9322442f | 5145 | write_ia(lease->ia); |
98bd7ca0 DH |
5146 | } |
5147 | } | |
5148 | ||
5149 | static void | |
5150 | ia_na_nomatch_decline(const struct data_string *client_id, | |
5151 | const struct data_string *iaaddr, | |
5152 | u_int32_t *ia_na_id, | |
5153 | struct packet *packet, | |
5154 | char *reply_data, | |
5155 | int *reply_ofs, | |
c382bc98 SK |
5156 | int reply_len) |
5157 | { | |
98bd7ca0 DH |
5158 | char tmp_addr[INET6_ADDRSTRLEN]; |
5159 | struct option_state *host_opt_state; | |
5160 | int len; | |
5161 | ||
5162 | log_info("Client %s declines address %s, which is not offered to it.", | |
5163 | print_hex_1(client_id->len, client_id->data, 60), | |
5164 | inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); | |
5165 | ||
5166 | /* | |
5167 | * Create state for this IA_NA. | |
5168 | */ | |
5169 | host_opt_state = NULL; | |
5170 | if (!option_state_allocate(&host_opt_state, MDL)) { | |
5171 | log_error("ia_na_nomatch_decline: out of memory " | |
5172 | "allocating option_state."); | |
5173 | goto exit; | |
5174 | } | |
5175 | ||
5176 | if (!set_status_code(STATUS_NoBinding, "Decline for unknown address.", | |
5177 | host_opt_state)) { | |
5178 | goto exit; | |
5179 | } | |
5180 | ||
5181 | /* | |
5182 | * Insure we have enough space | |
5183 | */ | |
5184 | if (reply_len < (*reply_ofs + 16)) { | |
5185 | log_error("ia_na_nomatch_decline: " | |
5186 | "out of space for reply packet."); | |
5187 | goto exit; | |
5188 | } | |
5189 | ||
5190 | /* | |
5191 | * Put our status code into the reply packet. | |
5192 | */ | |
5193 | len = store_options6(reply_data+(*reply_ofs)+16, | |
5194 | reply_len-(*reply_ofs)-16, | |
5195 | host_opt_state, packet, | |
5196 | required_opts_STATUS_CODE, NULL); | |
5197 | ||
5198 | /* | |
5199 | * Store the non-encapsulated option data for this | |
5200 | * IA_NA into our reply packet. Defined in RFC 3315, | |
5201 | * section 22.4. | |
5202 | */ | |
5203 | /* option number */ | |
28868515 | 5204 | putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_NA); |
98bd7ca0 | 5205 | /* option length */ |
28868515 | 5206 | putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); |
98bd7ca0 DH |
5207 | /* IA_NA, copied from the client */ |
5208 | memcpy(reply_data+(*reply_ofs)+4, ia_na_id, 4); | |
5209 | /* t1 and t2, odd that we need them, but here it is */ | |
28868515 SK |
5210 | putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); |
5211 | putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); | |
98bd7ca0 DH |
5212 | |
5213 | /* | |
5214 | * Get ready for next IA_NA. | |
5215 | */ | |
5216 | *reply_ofs += (len + 16); | |
5217 | ||
5218 | exit: | |
5219 | option_state_dereference(&host_opt_state, MDL); | |
5220 | } | |
5221 | ||
5222 | static void | |
5223 | iterate_over_ia_na(struct data_string *reply_ret, | |
5224 | struct packet *packet, | |
5225 | const struct data_string *client_id, | |
5226 | const struct data_string *server_id, | |
06eb8bab | 5227 | const char *packet_type, |
98bd7ca0 | 5228 | void (*ia_na_match)(), |
c382bc98 SK |
5229 | void (*ia_na_nomatch)()) |
5230 | { | |
98bd7ca0 DH |
5231 | struct option_state *opt_state; |
5232 | struct host_decl *packet_host; | |
5233 | struct option_cache *ia; | |
5234 | struct option_cache *oc; | |
5235 | /* cli_enc_... variables come from the IA_NA/IA_TA options */ | |
5236 | struct data_string cli_enc_opt_data; | |
5237 | struct option_state *cli_enc_opt_state; | |
5238 | struct host_decl *host; | |
5239 | struct option_state *host_opt_state; | |
98bd7ca0 DH |
5240 | struct data_string iaaddr; |
5241 | struct data_string fixed_addr; | |
98bd7ca0 DH |
5242 | char reply_data[65536]; |
5243 | struct dhcpv6_packet *reply = (struct dhcpv6_packet *)reply_data; | |
a3528574 | 5244 | int reply_ofs = (int)(offsetof(struct dhcpv6_packet, options)); |
98bd7ca0 | 5245 | char status_msg[32]; |
1d17db44 | 5246 | struct iasubopt *lease; |
9322442f | 5247 | struct ia_xx *existing_ia_na; |
98bd7ca0 DH |
5248 | int i; |
5249 | struct data_string key; | |
5250 | u_int32_t iaid; | |
5251 | ||
5252 | /* | |
5253 | * Initialize to empty values, in case we have to exit early. | |
5254 | */ | |
5255 | opt_state = NULL; | |
5256 | memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); | |
5257 | cli_enc_opt_state = NULL; | |
5258 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
5259 | memset(&fixed_addr, 0, sizeof(fixed_addr)); | |
5260 | host_opt_state = NULL; | |
5261 | lease = NULL; | |
5262 | ||
5263 | /* | |
5264 | * Find the host record that matches from the packet, if any. | |
5265 | */ | |
5266 | packet_host = NULL; | |
5267 | if (!find_hosts_by_uid(&packet_host, | |
5268 | client_id->data, client_id->len, MDL)) { | |
5269 | packet_host = NULL; | |
5270 | /* | |
5271 | * Note: In general, we don't expect a client to provide | |
5272 | * enough information to match by option for these | |
5273 | * types of messages, but if we don't have a UID | |
5274 | * match we can check anyway. | |
5275 | */ | |
5276 | if (!find_hosts_by_option(&packet_host, | |
5277 | packet, packet->options, MDL)) { | |
5278 | packet_host = NULL; | |
c900c5b2 DH |
5279 | |
5280 | if (!find_hosts_by_duid_chaddr(&packet_host, | |
5281 | client_id)) | |
5282 | packet_host = NULL; | |
98bd7ca0 DH |
5283 | } |
5284 | } | |
5285 | ||
5286 | /* | |
5287 | * Set our reply information. | |
5288 | */ | |
5289 | reply->msg_type = DHCPV6_REPLY; | |
5290 | memcpy(reply->transaction_id, packet->dhcpv6_transaction_id, | |
5291 | sizeof(reply->transaction_id)); | |
5292 | ||
5293 | /* | |
5294 | * Build our option state for reply. | |
5295 | */ | |
5296 | opt_state = NULL; | |
5297 | if (!option_state_allocate(&opt_state, MDL)) { | |
5298 | log_error("iterate_over_ia_na: no memory for option_state."); | |
5299 | goto exit; | |
5300 | } | |
5301 | execute_statements_in_scope(NULL, packet, NULL, NULL, | |
5302 | packet->options, opt_state, | |
a7341359 | 5303 | &global_scope, root_group, NULL, NULL); |
98bd7ca0 DH |
5304 | |
5305 | /* | |
5306 | * RFC 3315, section 18.2.7 tells us which options to include. | |
5307 | */ | |
5308 | oc = lookup_option(&dhcpv6_universe, opt_state, D6O_SERVERID); | |
5309 | if (oc == NULL) { | |
28868515 SK |
5310 | if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, |
5311 | (unsigned char *)server_duid.data, | |
98bd7ca0 DH |
5312 | server_duid.len, D6O_SERVERID, 0)) { |
5313 | log_error("iterate_over_ia_na: " | |
5314 | "error saving server identifier."); | |
5315 | goto exit; | |
5316 | } | |
5317 | } | |
5318 | ||
5319 | if (!save_option_buffer(&dhcpv6_universe, opt_state, | |
5320 | client_id->buffer, | |
5321 | (unsigned char *)client_id->data, | |
5322 | client_id->len, | |
5323 | D6O_CLIENTID, 0)) { | |
5324 | log_error("iterate_over_ia_na: " | |
5325 | "error saving client identifier."); | |
5326 | goto exit; | |
5327 | } | |
5328 | ||
5329 | snprintf(status_msg, sizeof(status_msg), "%s received.", packet_type); | |
5330 | if (!set_status_code(STATUS_Success, status_msg, opt_state)) { | |
5331 | goto exit; | |
5332 | } | |
5333 | ||
5334 | /* | |
5335 | * Add our options that are not associated with any IA_NA or IA_TA. | |
5336 | */ | |
5337 | reply_ofs += store_options6(reply_data+reply_ofs, | |
5338 | sizeof(reply_data)-reply_ofs, | |
5339 | opt_state, packet, | |
5340 | required_opts, NULL); | |
5341 | ||
5342 | /* | |
5343 | * Loop through the IA_NA reported by the client, and deal with | |
5344 | * addresses reported as already in use. | |
5345 | */ | |
5346 | for (ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); | |
5347 | ia != NULL; ia = ia->next) { | |
98bd7ca0 DH |
5348 | |
5349 | if (!get_encapsulated_IA_state(&cli_enc_opt_state, | |
5350 | &cli_enc_opt_data, | |
8eab95f2 | 5351 | packet, ia, IA_NA_OFFSET)) { |
98bd7ca0 DH |
5352 | goto exit; |
5353 | } | |
5354 | ||
5355 | iaid = getULong(cli_enc_opt_data.data); | |
5356 | ||
5357 | /* | |
5358 | * XXX: It is possible that we can get multiple addresses | |
5359 | * sent by the client. We don't send multiple | |
5360 | * addresses, so this indicates a client error. | |
5361 | * We should check for multiple IAADDR options, log | |
5362 | * if found, and set as an error. | |
5363 | */ | |
5364 | oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, | |
5365 | D6O_IAADDR); | |
5366 | if (oc == NULL) { | |
5367 | /* no address given for this IA, ignore */ | |
5368 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5369 | data_string_forget(&cli_enc_opt_data, MDL); | |
5370 | continue; | |
5371 | } | |
5372 | ||
5373 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
5374 | if (!evaluate_option_cache(&iaaddr, packet, NULL, NULL, | |
5375 | packet->options, NULL, | |
5376 | &global_scope, oc, MDL)) { | |
5377 | log_error("iterate_over_ia_na: " | |
5378 | "error evaluating IAADDR."); | |
5379 | goto exit; | |
5380 | } | |
5381 | ||
5382 | /* | |
5383 | * Now we need to figure out which host record matches | |
c900c5b2 DH |
5384 | * this IA_NA and IAADDR (encapsulated option contents |
5385 | * matching a host record by option). | |
98bd7ca0 DH |
5386 | * |
5387 | * XXX: We don't currently track IA_NA separately, but | |
5388 | * we will need to do this! | |
5389 | */ | |
5390 | host = NULL; | |
5391 | if (!find_hosts_by_option(&host, packet, | |
5392 | cli_enc_opt_state, MDL)) { | |
5393 | if (packet_host != NULL) { | |
5394 | host = packet_host; | |
5395 | } else { | |
5396 | host = NULL; | |
5397 | } | |
5398 | } | |
5399 | while (host != NULL) { | |
5400 | if (host->fixed_addr != NULL) { | |
5401 | if (!evaluate_option_cache(&fixed_addr, NULL, | |
5402 | NULL, NULL, NULL, | |
5403 | NULL, &global_scope, | |
5404 | host->fixed_addr, | |
5405 | MDL)) { | |
5406 | log_error("iterate_over_ia_na: error " | |
5407 | "evaluating host address."); | |
5408 | goto exit; | |
5409 | } | |
5410 | if ((iaaddr.len >= 16) && | |
5411 | !memcmp(fixed_addr.data, iaaddr.data, 16)) { | |
5412 | data_string_forget(&fixed_addr, MDL); | |
5413 | break; | |
5414 | } | |
5415 | data_string_forget(&fixed_addr, MDL); | |
5416 | } | |
5417 | host = host->n_ipaddr; | |
5418 | } | |
5419 | ||
5279b8f3 | 5420 | if ((host == NULL) && (iaaddr.len >= IAADDR_OFFSET)) { |
98bd7ca0 DH |
5421 | /* |
5422 | * Find existing IA_NA. | |
5423 | */ | |
1d9774ab FD |
5424 | if (ia_make_key(&key, iaid, |
5425 | (char *)client_id->data, | |
5426 | client_id->len, | |
5427 | MDL) != ISC_R_SUCCESS) { | |
98bd7ca0 DH |
5428 | log_fatal("iterate_over_ia_na: no memory for " |
5429 | "key."); | |
5430 | } | |
5431 | ||
5432 | existing_ia_na = NULL; | |
9322442f FD |
5433 | if (ia_hash_lookup(&existing_ia_na, ia_na_active, |
5434 | (unsigned char *)key.data, | |
5435 | key.len, MDL)) { | |
98bd7ca0 DH |
5436 | /* |
5437 | * Make sure this address is in the IA_NA. | |
5438 | */ | |
1d17db44 FD |
5439 | for (i=0; i<existing_ia_na->num_iasubopt; i++) { |
5440 | struct iasubopt *tmp; | |
98bd7ca0 DH |
5441 | struct in6_addr *in6_addr; |
5442 | ||
1d17db44 | 5443 | tmp = existing_ia_na->iasubopt[i]; |
98bd7ca0 DH |
5444 | in6_addr = &tmp->addr; |
5445 | if (memcmp(in6_addr, | |
5446 | iaaddr.data, 16) == 0) { | |
1d17db44 FD |
5447 | iasubopt_reference(&lease, |
5448 | tmp, MDL); | |
98bd7ca0 | 5449 | break; |
5279b8f3 | 5450 | } |
98bd7ca0 DH |
5451 | } |
5452 | } | |
5453 | ||
5454 | data_string_forget(&key, MDL); | |
5455 | } | |
5456 | ||
5457 | if ((host != NULL) || (lease != NULL)) { | |
5458 | ia_na_match(client_id, &iaaddr, lease); | |
5459 | } else { | |
5460 | ia_na_nomatch(client_id, &iaaddr, | |
5461 | (u_int32_t *)cli_enc_opt_data.data, | |
5462 | packet, reply_data, &reply_ofs, | |
5463 | sizeof(reply_data)); | |
5464 | } | |
5465 | ||
5466 | if (lease != NULL) { | |
1d17db44 | 5467 | iasubopt_dereference(&lease, MDL); |
98bd7ca0 DH |
5468 | } |
5469 | ||
5470 | data_string_forget(&iaaddr, MDL); | |
5471 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5472 | data_string_forget(&cli_enc_opt_data, MDL); | |
5473 | } | |
5474 | ||
5475 | /* | |
5476 | * Return our reply to the caller. | |
5477 | */ | |
5478 | reply_ret->len = reply_ofs; | |
5479 | reply_ret->buffer = NULL; | |
5480 | if (!buffer_allocate(&reply_ret->buffer, reply_ofs, MDL)) { | |
5481 | log_fatal("No memory to store reply."); | |
5482 | } | |
5483 | reply_ret->data = reply_ret->buffer->data; | |
5484 | memcpy(reply_ret->buffer->data, reply, reply_ofs); | |
5485 | ||
5486 | exit: | |
5487 | if (lease != NULL) { | |
1d17db44 | 5488 | iasubopt_dereference(&lease, MDL); |
98bd7ca0 DH |
5489 | } |
5490 | if (host_opt_state != NULL) { | |
5491 | option_state_dereference(&host_opt_state, MDL); | |
5492 | } | |
5493 | if (fixed_addr.buffer != NULL) { | |
5494 | data_string_forget(&fixed_addr, MDL); | |
5495 | } | |
5496 | if (iaaddr.buffer != NULL) { | |
5497 | data_string_forget(&iaaddr, MDL); | |
5498 | } | |
5499 | if (cli_enc_opt_state != NULL) { | |
5500 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5501 | } | |
5502 | if (cli_enc_opt_data.buffer != NULL) { | |
5503 | data_string_forget(&cli_enc_opt_data, MDL); | |
5504 | } | |
5505 | if (opt_state != NULL) { | |
5506 | option_state_dereference(&opt_state, MDL); | |
5507 | } | |
5508 | } | |
5509 | ||
5510 | /* | |
5511 | * Decline means a client has detected that something else is using an | |
5512 | * address we gave it. | |
5513 | * | |
5514 | * Since we're only dealing with fixed leases for now, there's not | |
20ae1aff | 5515 | * much we can do, other that log the occurrence. |
98bd7ca0 DH |
5516 | * |
5517 | * When we start issuing addresses from pools, then we will have to | |
5518 | * record our declined addresses and issue another. In general with | |
5519 | * IPv6 there is no worry about DoS by clients exhausting space, but | |
5520 | * we still need to be aware of this possibility. | |
5521 | */ | |
5522 | ||
72073970 | 5523 | /* TODO: reject unicast messages, unless we set unicast option */ |
98bd7ca0 DH |
5524 | /* TODO: IA_TA */ |
5525 | static void | |
5526 | dhcpv6_decline(struct data_string *reply, struct packet *packet) { | |
5527 | struct data_string client_id; | |
5528 | struct data_string server_id; | |
5529 | ||
5530 | /* | |
5531 | * Validate our input. | |
5532 | */ | |
5533 | if (!valid_client_resp(packet, &client_id, &server_id)) { | |
5534 | return; | |
5535 | } | |
5536 | ||
80c9fdb0 FD |
5537 | /* |
5538 | * Undefined for IA_PD. | |
5539 | */ | |
5540 | delete_option(&dhcpv6_universe, packet->options, D6O_IA_PD); | |
5541 | ||
98bd7ca0 DH |
5542 | /* |
5543 | * And operate on each IA_NA in this packet. | |
5544 | */ | |
5545 | iterate_over_ia_na(reply, packet, &client_id, &server_id, "Decline", | |
5546 | ia_na_match_decline, ia_na_nomatch_decline); | |
80c9fdb0 FD |
5547 | |
5548 | data_string_forget(&server_id, MDL); | |
5549 | data_string_forget(&client_id, MDL); | |
98bd7ca0 DH |
5550 | } |
5551 | ||
5552 | static void | |
5553 | ia_na_match_release(const struct data_string *client_id, | |
5554 | const struct data_string *iaaddr, | |
1d17db44 | 5555 | struct iasubopt *lease) |
c382bc98 | 5556 | { |
98bd7ca0 DH |
5557 | char tmp_addr[INET6_ADDRSTRLEN]; |
5558 | ||
5559 | log_info("Client %s releases address %s", | |
5560 | print_hex_1(client_id->len, client_id->data, 60), | |
5561 | inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); | |
5562 | if (lease != NULL) { | |
5563 | release_lease6(lease->ipv6_pool, lease); | |
1acab09f | 5564 | lease->ia->cltt = cur_time; |
9322442f | 5565 | write_ia(lease->ia); |
98bd7ca0 DH |
5566 | } |
5567 | } | |
5568 | ||
5569 | static void | |
5570 | ia_na_nomatch_release(const struct data_string *client_id, | |
5571 | const struct data_string *iaaddr, | |
5572 | u_int32_t *ia_na_id, | |
5573 | struct packet *packet, | |
5574 | char *reply_data, | |
5575 | int *reply_ofs, | |
c382bc98 SK |
5576 | int reply_len) |
5577 | { | |
98bd7ca0 DH |
5578 | char tmp_addr[INET6_ADDRSTRLEN]; |
5579 | struct option_state *host_opt_state; | |
5580 | int len; | |
5581 | ||
5582 | log_info("Client %s releases address %s, which is not leased to it.", | |
5583 | print_hex_1(client_id->len, client_id->data, 60), | |
5584 | inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); | |
5585 | ||
5586 | /* | |
5587 | * Create state for this IA_NA. | |
5588 | */ | |
5589 | host_opt_state = NULL; | |
5590 | if (!option_state_allocate(&host_opt_state, MDL)) { | |
c382bc98 | 5591 | log_error("ia_na_nomatch_release: out of memory " |
98bd7ca0 DH |
5592 | "allocating option_state."); |
5593 | goto exit; | |
5594 | } | |
5595 | ||
5596 | if (!set_status_code(STATUS_NoBinding, | |
5597 | "Release for non-leased address.", | |
5598 | host_opt_state)) { | |
5599 | goto exit; | |
5600 | } | |
5601 | ||
5602 | /* | |
5603 | * Insure we have enough space | |
5604 | */ | |
5605 | if (reply_len < (*reply_ofs + 16)) { | |
c382bc98 | 5606 | log_error("ia_na_nomatch_release: " |
98bd7ca0 DH |
5607 | "out of space for reply packet."); |
5608 | goto exit; | |
5609 | } | |
5610 | ||
5611 | /* | |
5612 | * Put our status code into the reply packet. | |
5613 | */ | |
5614 | len = store_options6(reply_data+(*reply_ofs)+16, | |
5615 | reply_len-(*reply_ofs)-16, | |
5616 | host_opt_state, packet, | |
5617 | required_opts_STATUS_CODE, NULL); | |
5618 | ||
5619 | /* | |
5620 | * Store the non-encapsulated option data for this | |
5621 | * IA_NA into our reply packet. Defined in RFC 3315, | |
5622 | * section 22.4. | |
5623 | */ | |
5624 | /* option number */ | |
28868515 | 5625 | putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_NA); |
98bd7ca0 | 5626 | /* option length */ |
28868515 | 5627 | putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); |
98bd7ca0 DH |
5628 | /* IA_NA, copied from the client */ |
5629 | memcpy(reply_data+(*reply_ofs)+4, ia_na_id, 4); | |
5630 | /* t1 and t2, odd that we need them, but here it is */ | |
28868515 SK |
5631 | putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); |
5632 | putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); | |
98bd7ca0 DH |
5633 | |
5634 | /* | |
5635 | * Get ready for next IA_NA. | |
5636 | */ | |
5637 | *reply_ofs += (len + 16); | |
5638 | ||
5639 | exit: | |
5640 | option_state_dereference(&host_opt_state, MDL); | |
5641 | } | |
5642 | ||
80c9fdb0 FD |
5643 | static void |
5644 | ia_pd_match_release(const struct data_string *client_id, | |
5645 | const struct data_string *iapref, | |
1d17db44 | 5646 | struct iasubopt *prefix) |
80c9fdb0 FD |
5647 | { |
5648 | char tmp_addr[INET6_ADDRSTRLEN]; | |
5649 | ||
5650 | log_info("Client %s releases prefix %s/%u", | |
5651 | print_hex_1(client_id->len, client_id->data, 60), | |
5652 | inet_ntop(AF_INET6, iapref->data + 9, | |
5653 | tmp_addr, sizeof(tmp_addr)), | |
5654 | (unsigned) getUChar(iapref->data + 8)); | |
5655 | if (prefix != NULL) { | |
9322442f | 5656 | release_lease6(prefix->ipv6_pool, prefix); |
1acab09f | 5657 | prefix->ia->cltt = cur_time; |
9322442f | 5658 | write_ia(prefix->ia); |
80c9fdb0 FD |
5659 | } |
5660 | } | |
5661 | ||
5662 | static void | |
5663 | ia_pd_nomatch_release(const struct data_string *client_id, | |
5664 | const struct data_string *iapref, | |
5665 | u_int32_t *ia_pd_id, | |
5666 | struct packet *packet, | |
5667 | char *reply_data, | |
5668 | int *reply_ofs, | |
5669 | int reply_len) | |
5670 | { | |
5671 | char tmp_addr[INET6_ADDRSTRLEN]; | |
5672 | struct option_state *host_opt_state; | |
5673 | int len; | |
5674 | ||
5675 | log_info("Client %s releases prefix %s/%u, which is not leased to it.", | |
5676 | print_hex_1(client_id->len, client_id->data, 60), | |
5677 | inet_ntop(AF_INET6, iapref->data + 9, | |
5678 | tmp_addr, sizeof(tmp_addr)), | |
5679 | (unsigned) getUChar(iapref->data + 8)); | |
5680 | ||
5681 | /* | |
5682 | * Create state for this IA_PD. | |
5683 | */ | |
5684 | host_opt_state = NULL; | |
5685 | if (!option_state_allocate(&host_opt_state, MDL)) { | |
5686 | log_error("ia_pd_nomatch_release: out of memory " | |
5687 | "allocating option_state."); | |
5688 | goto exit; | |
5689 | } | |
5690 | ||
5691 | if (!set_status_code(STATUS_NoBinding, | |
5692 | "Release for non-leased prefix.", | |
5693 | host_opt_state)) { | |
5694 | goto exit; | |
5695 | } | |
5696 | ||
5697 | /* | |
5698 | * Insure we have enough space | |
5699 | */ | |
5700 | if (reply_len < (*reply_ofs + 16)) { | |
5701 | log_error("ia_pd_nomatch_release: " | |
5702 | "out of space for reply packet."); | |
5703 | goto exit; | |
5704 | } | |
5705 | ||
5706 | /* | |
5707 | * Put our status code into the reply packet. | |
5708 | */ | |
5709 | len = store_options6(reply_data+(*reply_ofs)+16, | |
5710 | reply_len-(*reply_ofs)-16, | |
5711 | host_opt_state, packet, | |
5712 | required_opts_STATUS_CODE, NULL); | |
5713 | ||
5714 | /* | |
5715 | * Store the non-encapsulated option data for this | |
5716 | * IA_PD into our reply packet. Defined in RFC 3315, | |
5717 | * section 22.4. | |
5718 | */ | |
5719 | /* option number */ | |
5720 | putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_PD); | |
5721 | /* option length */ | |
5722 | putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); | |
5723 | /* IA_PD, copied from the client */ | |
5724 | memcpy(reply_data+(*reply_ofs)+4, ia_pd_id, 4); | |
5725 | /* t1 and t2, odd that we need them, but here it is */ | |
5726 | putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); | |
5727 | putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); | |
5728 | ||
5729 | /* | |
5730 | * Get ready for next IA_PD. | |
5731 | */ | |
5732 | *reply_ofs += (len + 16); | |
5733 | ||
5734 | exit: | |
5735 | option_state_dereference(&host_opt_state, MDL); | |
5736 | } | |
5737 | ||
5738 | static void | |
5739 | iterate_over_ia_pd(struct data_string *reply_ret, | |
5740 | struct packet *packet, | |
5741 | const struct data_string *client_id, | |
5742 | const struct data_string *server_id, | |
5743 | const char *packet_type, | |
5744 | void (*ia_pd_match)(), | |
5745 | void (*ia_pd_nomatch)()) | |
5746 | { | |
5747 | struct data_string reply_new; | |
5748 | int reply_len; | |
5749 | struct option_state *opt_state; | |
5750 | struct host_decl *packet_host; | |
5751 | struct option_cache *ia; | |
5752 | struct option_cache *oc; | |
5753 | /* cli_enc_... variables come from the IA_PD options */ | |
5754 | struct data_string cli_enc_opt_data; | |
5755 | struct option_state *cli_enc_opt_state; | |
5756 | struct host_decl *host; | |
5757 | struct option_state *host_opt_state; | |
5758 | struct data_string iaprefix; | |
80c9fdb0 FD |
5759 | char reply_data[65536]; |
5760 | int reply_ofs; | |
1d17db44 | 5761 | struct iasubopt *prefix; |
9322442f | 5762 | struct ia_xx *existing_ia_pd; |
80c9fdb0 FD |
5763 | int i; |
5764 | struct data_string key; | |
5765 | u_int32_t iaid; | |
5766 | ||
5767 | /* | |
5768 | * Initialize to empty values, in case we have to exit early. | |
5769 | */ | |
5770 | memset(&reply_new, 0, sizeof(reply_new)); | |
5771 | opt_state = NULL; | |
5772 | memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); | |
5773 | cli_enc_opt_state = NULL; | |
5774 | memset(&iaprefix, 0, sizeof(iaprefix)); | |
5775 | host_opt_state = NULL; | |
5776 | prefix = NULL; | |
5777 | ||
5778 | /* | |
5779 | * Compute the available length for the reply. | |
5780 | */ | |
5781 | reply_len = sizeof(reply_data) - reply_ret->len; | |
5782 | reply_ofs = 0; | |
5783 | ||
5784 | /* | |
5785 | * Find the host record that matches from the packet, if any. | |
5786 | */ | |
5787 | packet_host = NULL; | |
5788 | if (!find_hosts_by_uid(&packet_host, | |
5789 | client_id->data, client_id->len, MDL)) { | |
5790 | packet_host = NULL; | |
5791 | /* | |
5792 | * Note: In general, we don't expect a client to provide | |
5793 | * enough information to match by option for these | |
5794 | * types of messages, but if we don't have a UID | |
5795 | * match we can check anyway. | |
5796 | */ | |
5797 | if (!find_hosts_by_option(&packet_host, | |
5798 | packet, packet->options, MDL)) { | |
5799 | packet_host = NULL; | |
c900c5b2 DH |
5800 | |
5801 | if (!find_hosts_by_duid_chaddr(&packet_host, | |
5802 | client_id)) | |
5803 | packet_host = NULL; | |
80c9fdb0 FD |
5804 | } |
5805 | } | |
5806 | ||
5807 | /* | |
5808 | * Build our option state for reply. | |
5809 | */ | |
5810 | opt_state = NULL; | |
5811 | if (!option_state_allocate(&opt_state, MDL)) { | |
5812 | log_error("iterate_over_ia_pd: no memory for option_state."); | |
5813 | goto exit; | |
5814 | } | |
5815 | execute_statements_in_scope(NULL, packet, NULL, NULL, | |
5816 | packet->options, opt_state, | |
a7341359 | 5817 | &global_scope, root_group, NULL, NULL); |
80c9fdb0 FD |
5818 | |
5819 | /* | |
5820 | * Loop through the IA_PD reported by the client, and deal with | |
5821 | * prefixes reported as already in use. | |
5822 | */ | |
5823 | for (ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); | |
5824 | ia != NULL; ia = ia->next) { | |
80c9fdb0 FD |
5825 | |
5826 | if (!get_encapsulated_IA_state(&cli_enc_opt_state, | |
5827 | &cli_enc_opt_data, | |
5828 | packet, ia, IA_PD_OFFSET)) { | |
5829 | goto exit; | |
5830 | } | |
5831 | ||
5832 | iaid = getULong(cli_enc_opt_data.data); | |
5833 | ||
5834 | oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, | |
5835 | D6O_IAPREFIX); | |
5836 | if (oc == NULL) { | |
5837 | /* no prefix given for this IA_PD, ignore */ | |
5838 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5839 | data_string_forget(&cli_enc_opt_data, MDL); | |
5840 | continue; | |
5841 | } | |
5842 | ||
5843 | for (; oc != NULL; oc = oc->next) { | |
5844 | memset(&iaprefix, 0, sizeof(iaprefix)); | |
5845 | if (!evaluate_option_cache(&iaprefix, packet, NULL, NULL, | |
5846 | packet->options, NULL, | |
5847 | &global_scope, oc, MDL)) { | |
5848 | log_error("iterate_over_ia_pd: " | |
5849 | "error evaluating IAPREFIX."); | |
5850 | goto exit; | |
5851 | } | |
5852 | ||
5853 | /* | |
5854 | * Now we need to figure out which host record matches | |
c900c5b2 DH |
5855 | * this IA_PD and IAPREFIX (encapsulated option contents |
5856 | * matching a host record by option). | |
80c9fdb0 FD |
5857 | * |
5858 | * XXX: We don't currently track IA_PD separately, but | |
5859 | * we will need to do this! | |
5860 | */ | |
5861 | host = NULL; | |
5862 | if (!find_hosts_by_option(&host, packet, | |
5863 | cli_enc_opt_state, MDL)) { | |
5864 | if (packet_host != NULL) { | |
5865 | host = packet_host; | |
5866 | } else { | |
5867 | host = NULL; | |
5868 | } | |
5869 | } | |
5870 | while (host != NULL) { | |
5871 | if (host->fixed_prefix != NULL) { | |
5872 | struct iaddrcidrnetlist *l; | |
5873 | int plen = (int) getUChar(iaprefix.data + 8); | |
5874 | ||
5875 | for (l = host->fixed_prefix; l != NULL; | |
5876 | l = l->next) { | |
5877 | if (plen != l->cidrnet.bits) | |
5878 | continue; | |
5879 | if (memcmp(iaprefix.data + 9, | |
5880 | l->cidrnet.lo_addr.iabuf, | |
5881 | 16) == 0) | |
5882 | break; | |
5883 | } | |
5884 | if ((l != NULL) && (iaprefix.len >= 17)) | |
5885 | break; | |
5886 | } | |
5887 | host = host->n_ipaddr; | |
5888 | } | |
5889 | ||
5890 | if ((host == NULL) && (iaprefix.len >= IAPREFIX_OFFSET)) { | |
5891 | /* | |
5892 | * Find existing IA_PD. | |
5893 | */ | |
5894 | if (ia_make_key(&key, iaid, | |
5895 | (char *)client_id->data, | |
5896 | client_id->len, | |
5897 | MDL) != ISC_R_SUCCESS) { | |
5898 | log_fatal("iterate_over_ia_pd: no memory for " | |
5899 | "key."); | |
5900 | } | |
5901 | ||
5902 | existing_ia_pd = NULL; | |
9322442f FD |
5903 | if (ia_hash_lookup(&existing_ia_pd, ia_pd_active, |
5904 | (unsigned char *)key.data, | |
5905 | key.len, MDL)) { | |
80c9fdb0 FD |
5906 | /* |
5907 | * Make sure this prefix is in the IA_PD. | |
5908 | */ | |
5909 | for (i = 0; | |
1d17db44 | 5910 | i < existing_ia_pd->num_iasubopt; |
80c9fdb0 | 5911 | i++) { |
1d17db44 | 5912 | struct iasubopt *tmp; |
80c9fdb0 FD |
5913 | u_int8_t plen; |
5914 | ||
5915 | plen = getUChar(iaprefix.data + 8); | |
1d17db44 | 5916 | tmp = existing_ia_pd->iasubopt[i]; |
80c9fdb0 | 5917 | if ((tmp->plen == plen) && |
9322442f | 5918 | (memcmp(&tmp->addr, |
80c9fdb0 FD |
5919 | iaprefix.data + 9, |
5920 | 16) == 0)) { | |
1d17db44 FD |
5921 | iasubopt_reference(&prefix, |
5922 | tmp, MDL); | |
80c9fdb0 FD |
5923 | break; |
5924 | } | |
5925 | } | |
5926 | } | |
5927 | ||
5928 | data_string_forget(&key, MDL); | |
5929 | } | |
5930 | ||
5931 | if ((host != NULL) || (prefix != NULL)) { | |
5932 | ia_pd_match(client_id, &iaprefix, prefix); | |
5933 | } else { | |
5934 | ia_pd_nomatch(client_id, &iaprefix, | |
5935 | (u_int32_t *)cli_enc_opt_data.data, | |
5936 | packet, reply_data, &reply_ofs, | |
5937 | reply_len - reply_ofs); | |
5938 | } | |
5939 | ||
5940 | if (prefix != NULL) { | |
1d17db44 | 5941 | iasubopt_dereference(&prefix, MDL); |
80c9fdb0 FD |
5942 | } |
5943 | ||
5944 | data_string_forget(&iaprefix, MDL); | |
5945 | } | |
5946 | ||
5947 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5948 | data_string_forget(&cli_enc_opt_data, MDL); | |
5949 | } | |
5950 | ||
5951 | /* | |
5952 | * Return our reply to the caller. | |
5953 | * The IA_NA routine has already filled at least the header. | |
5954 | */ | |
5955 | reply_new.len = reply_ret->len + reply_ofs; | |
5956 | if (!buffer_allocate(&reply_new.buffer, reply_new.len, MDL)) { | |
5957 | log_fatal("No memory to store reply."); | |
5958 | } | |
5959 | reply_new.data = reply_new.buffer->data; | |
5960 | memcpy(reply_new.buffer->data, | |
5961 | reply_ret->buffer->data, reply_ret->len); | |
5962 | memcpy(reply_new.buffer->data + reply_ret->len, | |
5963 | reply_data, reply_ofs); | |
5964 | data_string_forget(reply_ret, MDL); | |
5965 | data_string_copy(reply_ret, &reply_new, MDL); | |
5966 | data_string_forget(&reply_new, MDL); | |
5967 | ||
5968 | exit: | |
5969 | if (prefix != NULL) { | |
1d17db44 | 5970 | iasubopt_dereference(&prefix, MDL); |
80c9fdb0 FD |
5971 | } |
5972 | if (host_opt_state != NULL) { | |
5973 | option_state_dereference(&host_opt_state, MDL); | |
5974 | } | |
5975 | if (iaprefix.buffer != NULL) { | |
5976 | data_string_forget(&iaprefix, MDL); | |
5977 | } | |
5978 | if (cli_enc_opt_state != NULL) { | |
5979 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5980 | } | |
5981 | if (cli_enc_opt_data.buffer != NULL) { | |
5982 | data_string_forget(&cli_enc_opt_data, MDL); | |
5983 | } | |
5984 | if (opt_state != NULL) { | |
5985 | option_state_dereference(&opt_state, MDL); | |
5986 | } | |
5987 | } | |
5988 | ||
98bd7ca0 | 5989 | /* |
9322442f | 5990 | * Release means a client is done with the leases. |
98bd7ca0 DH |
5991 | */ |
5992 | ||
72073970 | 5993 | /* TODO: reject unicast messages, unless we set unicast option */ |
98bd7ca0 DH |
5994 | static void |
5995 | dhcpv6_release(struct data_string *reply, struct packet *packet) { | |
5996 | struct data_string client_id; | |
5997 | struct data_string server_id; | |
5998 | ||
5999 | /* | |
6000 | * Validate our input. | |
6001 | */ | |
6002 | if (!valid_client_resp(packet, &client_id, &server_id)) { | |
6003 | return; | |
6004 | } | |
6005 | ||
6006 | /* | |
6007 | * And operate on each IA_NA in this packet. | |
6008 | */ | |
6009 | iterate_over_ia_na(reply, packet, &client_id, &server_id, "Release", | |
6010 | ia_na_match_release, ia_na_nomatch_release); | |
6011 | ||
80c9fdb0 FD |
6012 | /* |
6013 | * And operate on each IA_PD in this packet. | |
6014 | */ | |
6015 | iterate_over_ia_pd(reply, packet, &client_id, &server_id, "Release", | |
6016 | ia_pd_match_release, ia_pd_nomatch_release); | |
6017 | ||
98bd7ca0 DH |
6018 | data_string_forget(&server_id, MDL); |
6019 | data_string_forget(&client_id, MDL); | |
6020 | } | |
6021 | ||
6022 | /* | |
6023 | * Information-Request is used by clients who have obtained an address | |
6024 | * from other means, but want configuration information from the server. | |
6025 | */ | |
6026 | ||
98bd7ca0 DH |
6027 | static void |
6028 | dhcpv6_information_request(struct data_string *reply, struct packet *packet) { | |
6029 | struct data_string client_id; | |
6030 | struct data_string server_id; | |
6031 | ||
6032 | /* | |
6033 | * Validate our input. | |
6034 | */ | |
6035 | if (!valid_client_info_req(packet, &server_id)) { | |
6036 | return; | |
6037 | } | |
6038 | ||
6039 | /* | |
6040 | * Get our client ID, if there is one. | |
6041 | */ | |
6042 | memset(&client_id, 0, sizeof(client_id)); | |
6043 | if (get_client_id(packet, &client_id) != ISC_R_SUCCESS) { | |
6044 | data_string_forget(&client_id, MDL); | |
6045 | } | |
6046 | ||
6047 | /* | |
6048 | * Use the lease_to_client() function. This will work fine, | |
6049 | * because the valid_client_info_req() insures that we | |
80c9fdb0 FD |
6050 | * don't have any IA that would cause us to allocate |
6051 | * resources to the client. | |
98bd7ca0 | 6052 | */ |
4f963ddc FD |
6053 | lease_to_client(reply, packet, &client_id, |
6054 | server_id.data != NULL ? &server_id : NULL); | |
98bd7ca0 DH |
6055 | |
6056 | /* | |
6057 | * Cleanup. | |
6058 | */ | |
6059 | if (client_id.data != NULL) { | |
6060 | data_string_forget(&client_id, MDL); | |
6061 | } | |
6062 | data_string_forget(&server_id, MDL); | |
6063 | } | |
6064 | ||
6065 | /* | |
6066 | * The Relay-forw message is sent by relays. It typically contains a | |
6067 | * single option, which encapsulates an entire packet. | |
6068 | * | |
6069 | * We need to build an encapsulated reply. | |
6070 | */ | |
6071 | ||
6072 | /* XXX: this is very, very similar to do_packet6(), and should probably | |
6073 | be combined in a clever way */ | |
6074 | static void | |
6075 | dhcpv6_relay_forw(struct data_string *reply_ret, struct packet *packet) { | |
98bd7ca0 DH |
6076 | struct option_cache *oc; |
6077 | struct data_string enc_opt_data; | |
6078 | struct packet *enc_packet; | |
6079 | unsigned char msg_type; | |
5279b8f3 DH |
6080 | const struct dhcpv6_packet *msg; |
6081 | const struct dhcpv6_relay_packet *relay; | |
98bd7ca0 DH |
6082 | struct data_string enc_reply; |
6083 | char link_addr[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; | |
6084 | char peer_addr[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; | |
2b964ac0 FD |
6085 | struct data_string a_opt, packet_ero; |
6086 | struct option_state *opt_state; | |
6087 | static char reply_data[65536]; | |
6088 | struct dhcpv6_relay_packet *reply; | |
6089 | int reply_ofs; | |
98bd7ca0 DH |
6090 | |
6091 | /* | |
20ae1aff | 6092 | * Initialize variables for early exit. |
98bd7ca0 | 6093 | */ |
93c769ce | 6094 | opt_state = NULL; |
2b964ac0 FD |
6095 | memset(&a_opt, 0, sizeof(a_opt)); |
6096 | memset(&packet_ero, 0, sizeof(packet_ero)); | |
93c769ce FD |
6097 | memset(&enc_reply, 0, sizeof(enc_reply)); |
6098 | memset(&enc_opt_data, 0, sizeof(enc_opt_data)); | |
6099 | enc_packet = NULL; | |
98bd7ca0 DH |
6100 | |
6101 | /* | |
6102 | * Get our encapsulated relay message. | |
6103 | */ | |
6104 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_RELAY_MSG); | |
6105 | if (oc == NULL) { | |
6106 | inet_ntop(AF_INET6, &packet->dhcpv6_link_address, | |
6107 | link_addr, sizeof(link_addr)); | |
6108 | inet_ntop(AF_INET6, &packet->dhcpv6_peer_address, | |
6109 | peer_addr, sizeof(peer_addr)); | |
6110 | log_info("Relay-forward from %s with link address=%s and " | |
6111 | "peer address=%s missing Relay Message option.", | |
6112 | piaddr(packet->client_addr), link_addr, peer_addr); | |
6113 | goto exit; | |
6114 | } | |
6115 | ||
98bd7ca0 DH |
6116 | if (!evaluate_option_cache(&enc_opt_data, NULL, NULL, NULL, |
6117 | NULL, NULL, &global_scope, oc, MDL)) { | |
6118 | log_error("dhcpv6_forw_relay: error evaluating " | |
6119 | "relayed message."); | |
6120 | goto exit; | |
6121 | } | |
6122 | ||
28868515 | 6123 | if (!packet6_len_okay((char *)enc_opt_data.data, enc_opt_data.len)) { |
98bd7ca0 DH |
6124 | log_error("dhcpv6_forw_relay: encapsulated packet too short."); |
6125 | goto exit; | |
6126 | } | |
6127 | ||
6128 | /* | |
6129 | * Build a packet structure from this encapsulated packet. | |
6130 | */ | |
6131 | enc_packet = NULL; | |
6132 | if (!packet_allocate(&enc_packet, MDL)) { | |
6133 | log_error("dhcpv6_forw_relay: " | |
6134 | "no memory for encapsulated packet."); | |
6135 | goto exit; | |
6136 | } | |
6137 | ||
6138 | if (!option_state_allocate(&enc_packet->options, MDL)) { | |
6139 | log_error("dhcpv6_forw_relay: " | |
6140 | "no memory for encapsulated packet's options."); | |
6141 | goto exit; | |
6142 | } | |
6143 | ||
6144 | enc_packet->client_port = packet->client_port; | |
6145 | enc_packet->client_addr = packet->client_addr; | |
4dc5a6b1 | 6146 | interface_reference(&enc_packet->interface, packet->interface, MDL); |
98bd7ca0 DH |
6147 | enc_packet->dhcpv6_container_packet = packet; |
6148 | ||
6149 | msg_type = enc_opt_data.data[0]; | |
5279b8f3 DH |
6150 | if ((msg_type == DHCPV6_RELAY_FORW) || |
6151 | (msg_type == DHCPV6_RELAY_REPL)) { | |
b342f2e7 | 6152 | int relaylen = (int)(offsetof(struct dhcpv6_relay_packet, options)); |
5279b8f3 DH |
6153 | relay = (struct dhcpv6_relay_packet *)enc_opt_data.data; |
6154 | enc_packet->dhcpv6_msg_type = relay->msg_type; | |
98bd7ca0 | 6155 | |
5279b8f3 DH |
6156 | /* relay-specific data */ |
6157 | enc_packet->dhcpv6_hop_count = relay->hop_count; | |
98bd7ca0 DH |
6158 | memcpy(&enc_packet->dhcpv6_link_address, |
6159 | relay->link_address, sizeof(relay->link_address)); | |
6160 | memcpy(&enc_packet->dhcpv6_peer_address, | |
6161 | relay->peer_address, sizeof(relay->peer_address)); | |
6162 | ||
5279b8f3 DH |
6163 | if (!parse_option_buffer(enc_packet->options, |
6164 | relay->options, | |
b342f2e7 | 6165 | enc_opt_data.len - relaylen, |
5279b8f3 DH |
6166 | &dhcpv6_universe)) { |
6167 | /* no logging here, as parse_option_buffer() logs all | |
6168 | cases where it fails */ | |
6169 | goto exit; | |
6170 | } | |
6171 | } else { | |
b342f2e7 | 6172 | int msglen = (int)(offsetof(struct dhcpv6_packet, options)); |
5279b8f3 DH |
6173 | msg = (struct dhcpv6_packet *)enc_opt_data.data; |
6174 | enc_packet->dhcpv6_msg_type = msg->msg_type; | |
6175 | ||
6176 | /* message-specific data */ | |
6177 | memcpy(enc_packet->dhcpv6_transaction_id, | |
6178 | msg->transaction_id, | |
6179 | sizeof(enc_packet->dhcpv6_transaction_id)); | |
6180 | ||
6181 | if (!parse_option_buffer(enc_packet->options, | |
6182 | msg->options, | |
b342f2e7 | 6183 | enc_opt_data.len - msglen, |
5279b8f3 DH |
6184 | &dhcpv6_universe)) { |
6185 | /* no logging here, as parse_option_buffer() logs all | |
6186 | cases where it fails */ | |
6187 | goto exit; | |
6188 | } | |
6189 | } | |
98bd7ca0 DH |
6190 | |
6191 | /* | |
6192 | * This is recursive. It is possible to exceed maximum packet size. | |
6193 | * XXX: This will cause the packet send to fail. | |
6194 | */ | |
6195 | build_dhcpv6_reply(&enc_reply, enc_packet); | |
6196 | ||
6197 | /* | |
6198 | * If we got no encapsulated data, then it is discarded, and | |
6199 | * our reply-forw is also discarded. | |
6200 | */ | |
6201 | if (enc_reply.data == NULL) { | |
6202 | goto exit; | |
6203 | } | |
6204 | ||
6205 | /* | |
2b964ac0 FD |
6206 | * Now we can use the reply_data buffer. |
6207 | * Packet header stuff all comes from the forward message. | |
6208 | */ | |
6209 | reply = (struct dhcpv6_relay_packet *)reply_data; | |
6210 | reply->msg_type = DHCPV6_RELAY_REPL; | |
6211 | reply->hop_count = packet->dhcpv6_hop_count; | |
6212 | memcpy(reply->link_address, &packet->dhcpv6_link_address, | |
6213 | sizeof(reply->link_address)); | |
6214 | memcpy(reply->peer_address, &packet->dhcpv6_peer_address, | |
6215 | sizeof(reply->peer_address)); | |
a3528574 | 6216 | reply_ofs = (int)(offsetof(struct dhcpv6_relay_packet, options)); |
2b964ac0 FD |
6217 | |
6218 | /* | |
6219 | * Get the reply option state. | |
6220 | */ | |
6221 | opt_state = NULL; | |
6222 | if (!option_state_allocate(&opt_state, MDL)) { | |
6223 | log_error("dhcpv6_relay_forw: no memory for option state."); | |
6224 | goto exit; | |
6225 | } | |
6226 | ||
6227 | /* | |
6228 | * Append the interface-id if present. | |
98bd7ca0 | 6229 | */ |
2b964ac0 FD |
6230 | oc = lookup_option(&dhcpv6_universe, packet->options, |
6231 | D6O_INTERFACE_ID); | |
98bd7ca0 | 6232 | if (oc != NULL) { |
2b964ac0 FD |
6233 | if (!evaluate_option_cache(&a_opt, packet, |
6234 | NULL, NULL, | |
6235 | packet->options, NULL, | |
6236 | &global_scope, oc, MDL)) { | |
6237 | log_error("dhcpv6_relay_forw: error evaluating " | |
6238 | "Interface ID."); | |
6239 | goto exit; | |
6240 | } | |
6241 | if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, | |
6242 | (unsigned char *)a_opt.data, | |
6243 | a_opt.len, | |
6244 | D6O_INTERFACE_ID, 0)) { | |
6245 | log_error("dhcpv6_relay_forw: error saving " | |
98bd7ca0 DH |
6246 | "Interface ID."); |
6247 | goto exit; | |
6248 | } | |
2b964ac0 | 6249 | data_string_forget(&a_opt, MDL); |
98bd7ca0 DH |
6250 | } |
6251 | ||
98bd7ca0 | 6252 | /* |
2b964ac0 | 6253 | * Append our encapsulated stuff for caller. |
98bd7ca0 | 6254 | */ |
2b964ac0 FD |
6255 | if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, |
6256 | (unsigned char *)enc_reply.data, | |
6257 | enc_reply.len, | |
6258 | D6O_RELAY_MSG, 0)) { | |
6259 | log_error("dhcpv6_relay_forw: error saving Relay MSG."); | |
6260 | goto exit; | |
98bd7ca0 | 6261 | } |
2b964ac0 FD |
6262 | |
6263 | /* | |
6264 | * Get the ERO if any. | |
98bd7ca0 | 6265 | */ |
2b964ac0 FD |
6266 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_ERO); |
6267 | if (oc != NULL) { | |
6268 | unsigned req; | |
6269 | int i; | |
6270 | ||
6271 | if (!evaluate_option_cache(&packet_ero, packet, | |
6272 | NULL, NULL, | |
6273 | packet->options, NULL, | |
6274 | &global_scope, oc, MDL) || | |
6275 | (packet_ero.len & 1)) { | |
6276 | log_error("dhcpv6_relay_forw: error evaluating ERO."); | |
6277 | goto exit; | |
6278 | } | |
6279 | ||
6280 | /* Decode and apply the ERO. */ | |
6281 | for (i = 0; i < packet_ero.len; i += 2) { | |
6282 | req = getUShort(packet_ero.data + i); | |
6283 | /* Already in the reply? */ | |
6284 | oc = lookup_option(&dhcpv6_universe, opt_state, req); | |
6285 | if (oc != NULL) | |
6286 | continue; | |
6287 | /* Get it from the packet if present. */ | |
6288 | oc = lookup_option(&dhcpv6_universe, | |
6289 | packet->options, | |
6290 | req); | |
6291 | if (oc == NULL) | |
6292 | continue; | |
6293 | if (!evaluate_option_cache(&a_opt, packet, | |
6294 | NULL, NULL, | |
6295 | packet->options, NULL, | |
6296 | &global_scope, oc, MDL)) { | |
6297 | log_error("dhcpv6_relay_forw: error " | |
6298 | "evaluating option %u.", req); | |
6299 | goto exit; | |
6300 | } | |
6301 | if (!save_option_buffer(&dhcpv6_universe, | |
6302 | opt_state, | |
6303 | NULL, | |
6304 | (unsigned char *)a_opt.data, | |
6305 | a_opt.len, | |
6306 | req, | |
6307 | 0)) { | |
6308 | log_error("dhcpv6_relay_forw: error saving " | |
6309 | "option %u.", req); | |
6310 | goto exit; | |
6311 | } | |
6312 | data_string_forget(&a_opt, MDL); | |
6313 | } | |
98bd7ca0 | 6314 | } |
2b964ac0 FD |
6315 | |
6316 | reply_ofs += store_options6(reply_data + reply_ofs, | |
6317 | sizeof(reply_data) - reply_ofs, | |
6318 | opt_state, packet, | |
6319 | required_opts_agent, &packet_ero); | |
6320 | ||
6321 | /* | |
6322 | * Return our reply to the caller. | |
6323 | */ | |
6324 | reply_ret->len = reply_ofs; | |
98bd7ca0 DH |
6325 | reply_ret->buffer = NULL; |
6326 | if (!buffer_allocate(&reply_ret->buffer, reply_ret->len, MDL)) { | |
6327 | log_fatal("No memory to store reply."); | |
6328 | } | |
6329 | reply_ret->data = reply_ret->buffer->data; | |
2b964ac0 | 6330 | memcpy(reply_ret->buffer->data, reply_data, reply_ofs); |
98bd7ca0 DH |
6331 | |
6332 | exit: | |
2b964ac0 FD |
6333 | if (opt_state != NULL) |
6334 | option_state_dereference(&opt_state, MDL); | |
6335 | if (a_opt.data != NULL) { | |
6336 | data_string_forget(&a_opt, MDL); | |
6337 | } | |
6338 | if (packet_ero.data != NULL) { | |
6339 | data_string_forget(&packet_ero, MDL); | |
98bd7ca0 DH |
6340 | } |
6341 | if (enc_reply.data != NULL) { | |
6342 | data_string_forget(&enc_reply, MDL); | |
6343 | } | |
6344 | if (enc_opt_data.data != NULL) { | |
6345 | data_string_forget(&enc_opt_data, MDL); | |
6346 | } | |
6347 | if (enc_packet != NULL) { | |
6348 | packet_dereference(&enc_packet, MDL); | |
6349 | } | |
6350 | } | |
6351 | ||
6352 | static void | |
6353 | dhcpv6_discard(struct packet *packet) { | |
6354 | /* INSIST(packet->msg_type > 0); */ | |
6355 | /* INSIST(packet->msg_type < dhcpv6_type_name_max); */ | |
6356 | ||
6357 | log_debug("Discarding %s from %s; message type not handled by server", | |
6358 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
6359 | piaddr(packet->client_addr)); | |
6360 | } | |
6361 | ||
6362 | static void | |
6363 | build_dhcpv6_reply(struct data_string *reply, struct packet *packet) { | |
6364 | memset(reply, 0, sizeof(*reply)); | |
01fa619f | 6365 | |
619304cd SR |
6366 | /* I would like to classify the client once here, but |
6367 | * as I don't want to classify all of the incoming packets | |
6368 | * I need to do it before handling specific types. | |
6369 | * We don't need to classify if we are tossing the packet | |
6370 | * or if it is a relay - the classification step will get | |
6371 | * done when we process the inner client packet. | |
6372 | */ | |
01fa619f | 6373 | |
98bd7ca0 DH |
6374 | switch (packet->dhcpv6_msg_type) { |
6375 | case DHCPV6_SOLICIT: | |
619304cd | 6376 | classify_client(packet); |
98bd7ca0 DH |
6377 | dhcpv6_solicit(reply, packet); |
6378 | break; | |
6379 | case DHCPV6_ADVERTISE: | |
6380 | dhcpv6_discard(packet); | |
6381 | break; | |
6382 | case DHCPV6_REQUEST: | |
619304cd | 6383 | classify_client(packet); |
98bd7ca0 DH |
6384 | dhcpv6_request(reply, packet); |
6385 | break; | |
6386 | case DHCPV6_CONFIRM: | |
619304cd | 6387 | classify_client(packet); |
98bd7ca0 DH |
6388 | dhcpv6_confirm(reply, packet); |
6389 | break; | |
6390 | case DHCPV6_RENEW: | |
619304cd | 6391 | classify_client(packet); |
98bd7ca0 DH |
6392 | dhcpv6_renew(reply, packet); |
6393 | break; | |
6394 | case DHCPV6_REBIND: | |
619304cd | 6395 | classify_client(packet); |
98bd7ca0 DH |
6396 | dhcpv6_rebind(reply, packet); |
6397 | break; | |
6398 | case DHCPV6_REPLY: | |
6399 | dhcpv6_discard(packet); | |
6400 | break; | |
6401 | case DHCPV6_RELEASE: | |
619304cd | 6402 | classify_client(packet); |
98bd7ca0 DH |
6403 | dhcpv6_release(reply, packet); |
6404 | break; | |
6405 | case DHCPV6_DECLINE: | |
619304cd | 6406 | classify_client(packet); |
98bd7ca0 DH |
6407 | dhcpv6_decline(reply, packet); |
6408 | break; | |
6409 | case DHCPV6_RECONFIGURE: | |
6410 | dhcpv6_discard(packet); | |
6411 | break; | |
6412 | case DHCPV6_INFORMATION_REQUEST: | |
619304cd | 6413 | classify_client(packet); |
98bd7ca0 DH |
6414 | dhcpv6_information_request(reply, packet); |
6415 | break; | |
6416 | case DHCPV6_RELAY_FORW: | |
6417 | dhcpv6_relay_forw(reply, packet); | |
6418 | break; | |
6419 | case DHCPV6_RELAY_REPL: | |
6420 | dhcpv6_discard(packet); | |
6421 | break; | |
37ec5845 | 6422 | case DHCPV6_LEASEQUERY: |
619304cd | 6423 | classify_client(packet); |
37ec5845 FD |
6424 | dhcpv6_leasequery(reply, packet); |
6425 | break; | |
6426 | case DHCPV6_LEASEQUERY_REPLY: | |
6427 | dhcpv6_discard(packet); | |
6428 | break; | |
98bd7ca0 DH |
6429 | default: |
6430 | /* XXX: would be nice if we had "notice" level, | |
6431 | as syslog, for this */ | |
6432 | log_info("Discarding unknown DHCPv6 message type %d " | |
6433 | "from %s", packet->dhcpv6_msg_type, | |
6434 | piaddr(packet->client_addr)); | |
6435 | } | |
6436 | } | |
6437 | ||
6438 | static void | |
6439 | log_packet_in(const struct packet *packet) { | |
6440 | struct data_string s; | |
6441 | u_int32_t tid; | |
6442 | char tmp_addr[INET6_ADDRSTRLEN]; | |
6443 | const void *addr; | |
98bd7ca0 DH |
6444 | |
6445 | memset(&s, 0, sizeof(s)); | |
6446 | ||
6447 | if (packet->dhcpv6_msg_type < dhcpv6_type_name_max) { | |
6448 | data_string_sprintfa(&s, "%s message from %s port %d", | |
6449 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
6450 | piaddr(packet->client_addr), | |
6451 | ntohs(packet->client_port)); | |
6452 | } else { | |
6453 | data_string_sprintfa(&s, | |
6454 | "Unknown message type %d from %s port %d", | |
6455 | packet->dhcpv6_msg_type, | |
6456 | piaddr(packet->client_addr), | |
6457 | ntohs(packet->client_port)); | |
6458 | } | |
6459 | if ((packet->dhcpv6_msg_type == DHCPV6_RELAY_FORW) || | |
6460 | (packet->dhcpv6_msg_type == DHCPV6_RELAY_REPL)) { | |
6461 | addr = &packet->dhcpv6_link_address; | |
6462 | data_string_sprintfa(&s, ", link address %s", | |
6463 | inet_ntop(AF_INET6, addr, | |
6464 | tmp_addr, sizeof(tmp_addr))); | |
6465 | addr = &packet->dhcpv6_peer_address; | |
6466 | data_string_sprintfa(&s, ", peer address %s", | |
6467 | inet_ntop(AF_INET6, addr, | |
6468 | tmp_addr, sizeof(tmp_addr))); | |
6469 | } else { | |
6470 | tid = 0; | |
6471 | memcpy(((char *)&tid)+1, packet->dhcpv6_transaction_id, 3); | |
6472 | data_string_sprintfa(&s, ", transaction ID 0x%06X", tid); | |
6473 | ||
6474 | /* | |
6475 | oc = lookup_option(&dhcpv6_universe, packet->options, | |
6476 | D6O_CLIENTID); | |
6477 | if (oc != NULL) { | |
6478 | memset(&tmp_ds, 0, sizeof(tmp_ds_)); | |
6479 | if (!evaluate_option_cache(&tmp_ds, packet, NULL, NULL, | |
6480 | packet->options, NULL, | |
6481 | &global_scope, oc, MDL)) { | |
6482 | log_error("Error evaluating Client Identifier"); | |
6483 | } else { | |
6484 | data_strint_sprintf(&s, ", client ID %s", | |
6485 | ||
6486 | data_string_forget(&tmp_ds, MDL); | |
6487 | } | |
6488 | } | |
6489 | */ | |
6490 | ||
6491 | } | |
6492 | log_info("%s", s.data); | |
6493 | ||
6494 | data_string_forget(&s, MDL); | |
6495 | } | |
6496 | ||
6497 | void | |
6498 | dhcpv6(struct packet *packet) { | |
6499 | struct data_string reply; | |
6500 | struct sockaddr_in6 to_addr; | |
6501 | int send_ret; | |
6502 | ||
6503 | /* | |
6504 | * Log a message that we received this packet. | |
6505 | */ | |
6506 | log_packet_in(packet); | |
6507 | ||
6508 | /* | |
6509 | * Build our reply packet. | |
6510 | */ | |
6511 | build_dhcpv6_reply(&reply, packet); | |
6512 | ||
6513 | if (reply.data != NULL) { | |
6514 | /* | |
6515 | * Send our reply, if we have one. | |
6516 | */ | |
6517 | memset(&to_addr, 0, sizeof(to_addr)); | |
6518 | to_addr.sin6_family = AF_INET6; | |
6519 | if ((packet->dhcpv6_msg_type == DHCPV6_RELAY_FORW) || | |
6520 | (packet->dhcpv6_msg_type == DHCPV6_RELAY_REPL)) { | |
6521 | to_addr.sin6_port = local_port; | |
6522 | } else { | |
6523 | to_addr.sin6_port = remote_port; | |
6524 | } | |
fb30f3fc SR |
6525 | |
6526 | #if defined (REPLY_TO_SOURCE_PORT) | |
6527 | /* | |
6528 | * This appears to have been included for testing so we would | |
6529 | * not need a root client, but was accidently left in the | |
6530 | * final code. We continue to include it in case | |
6531 | * some users have come to rely upon it, but leave | |
6532 | * it off by default as it's a bad idea. | |
6533 | */ | |
98bd7ca0 | 6534 | to_addr.sin6_port = packet->client_port; |
fb30f3fc SR |
6535 | #endif |
6536 | ||
98bd7ca0 DH |
6537 | memcpy(&to_addr.sin6_addr, packet->client_addr.iabuf, |
6538 | sizeof(to_addr.sin6_addr)); | |
6539 | ||
6540 | log_info("Sending %s to %s port %d", | |
6541 | dhcpv6_type_names[reply.data[0]], | |
6542 | piaddr(packet->client_addr), | |
6543 | ntohs(to_addr.sin6_port)); | |
6544 | ||
6545 | send_ret = send_packet6(packet->interface, | |
6546 | reply.data, reply.len, &to_addr); | |
6547 | if (send_ret != reply.len) { | |
6548 | log_error("dhcpv6: send_packet6() sent %d of %d bytes", | |
6549 | send_ret, reply.len); | |
6550 | } | |
6551 | data_string_forget(&reply, MDL); | |
6552 | } | |
6553 | } | |
6554 | ||
5279b8f3 DH |
6555 | static void |
6556 | seek_shared_host(struct host_decl **hp, struct shared_network *shared) { | |
6557 | struct host_decl *nofixed = NULL; | |
6558 | struct host_decl *seek, *hold = NULL; | |
6559 | ||
6560 | /* | |
bd72740e FD |
6561 | * Seek forward through fixed addresses for the right link. |
6562 | * | |
6563 | * Note: how to do this for fixed prefixes??? | |
5279b8f3 DH |
6564 | */ |
6565 | host_reference(&hold, *hp, MDL); | |
6566 | host_dereference(hp, MDL); | |
6567 | seek = hold; | |
6568 | while (seek != NULL) { | |
6569 | if (seek->fixed_addr == NULL) | |
6570 | nofixed = seek; | |
6571 | else if (fixed_matches_shared(seek, shared)) | |
6572 | break; | |
6573 | ||
6574 | seek = seek->n_ipaddr; | |
6575 | } | |
6576 | ||
6577 | if ((seek == NULL) && (nofixed != NULL)) | |
6578 | seek = nofixed; | |
6579 | ||
6580 | if (seek != NULL) | |
6581 | host_reference(hp, seek, MDL); | |
6582 | } | |
6583 | ||
6584 | static isc_boolean_t | |
6585 | fixed_matches_shared(struct host_decl *host, struct shared_network *shared) { | |
6586 | struct subnet *subnet; | |
6587 | struct data_string addr; | |
6588 | isc_boolean_t matched; | |
6589 | struct iaddr fixed; | |
6590 | ||
6591 | if (host->fixed_addr == NULL) | |
6592 | return ISC_FALSE; | |
6593 | ||
6594 | memset(&addr, 0, sizeof(addr)); | |
6595 | if (!evaluate_option_cache(&addr, NULL, NULL, NULL, NULL, NULL, | |
6596 | &global_scope, host->fixed_addr, MDL)) | |
6597 | return ISC_FALSE; | |
6598 | ||
6599 | if (addr.len < 16) { | |
6600 | data_string_forget(&addr, MDL); | |
6601 | return ISC_FALSE; | |
6602 | } | |
6603 | ||
6604 | fixed.len = 16; | |
6605 | memcpy(fixed.iabuf, addr.data, 16); | |
6606 | ||
6607 | matched = ISC_FALSE; | |
6608 | for (subnet = shared->subnets ; subnet != NULL ; | |
6609 | subnet = subnet->next_sibling) { | |
6610 | if (addr_eq(subnet_number(fixed, subnet->netmask), | |
6611 | subnet->net)) { | |
6612 | matched = ISC_TRUE; | |
6613 | break; | |
6614 | } | |
6615 | } | |
6616 | ||
6617 | data_string_forget(&addr, MDL); | |
6618 | return matched; | |
6619 | } | |
6620 | ||
c900c5b2 DH |
6621 | /* |
6622 | * find_host_by_duid_chaddr() synthesizes a DHCPv4-like 'hardware' | |
6623 | * parameter from a DHCPv6 supplied DUID (client-identifier option), | |
6624 | * and may seek to use client or relay supplied hardware addresses. | |
6625 | */ | |
6626 | static int | |
6627 | find_hosts_by_duid_chaddr(struct host_decl **host, | |
6628 | const struct data_string *client_id) { | |
6629 | static int once_htype; | |
6630 | int htype, hlen; | |
6631 | const unsigned char *chaddr; | |
6632 | ||
6633 | /* | |
6634 | * The DUID-LL and DUID-LLT must have a 2-byte DUID type and 2-byte | |
6635 | * htype. | |
6636 | */ | |
6637 | if (client_id->len < 4) | |
6638 | return 0; | |
6639 | ||
6640 | /* | |
6641 | * The third and fourth octets of the DUID-LL and DUID-LLT | |
6642 | * is the hardware type, but in 16 bits. | |
6643 | */ | |
6644 | htype = getUShort(client_id->data + 2); | |
6645 | hlen = 0; | |
fed0952f | 6646 | chaddr = NULL; |
c900c5b2 DH |
6647 | |
6648 | /* The first two octets of the DUID identify the type. */ | |
6649 | switch(getUShort(client_id->data)) { | |
6650 | case DUID_LLT: | |
6651 | if (client_id->len > 8) { | |
6652 | hlen = client_id->len - 8; | |
6653 | chaddr = client_id->data + 8; | |
6654 | } | |
6655 | break; | |
6656 | ||
6657 | case DUID_LL: | |
6658 | /* | |
6659 | * Note that client_id->len must be greater than or equal | |
6660 | * to four to get to this point in the function. | |
6661 | */ | |
6662 | hlen = client_id->len - 4; | |
6663 | chaddr = client_id->data + 4; | |
6664 | break; | |
6665 | ||
6666 | default: | |
c900c5b2 DH |
6667 | break; |
6668 | } | |
6669 | ||
e563ec2e | 6670 | if ((hlen == 0) || (hlen > HARDWARE_ADDR_LEN)) |
c900c5b2 DH |
6671 | return 0; |
6672 | ||
6673 | /* | |
6674 | * XXX: DHCPv6 gives a 16-bit field for the htype. DHCPv4 gives an | |
6675 | * 8-bit field. To change the semantics of the generic 'hardware' | |
6676 | * structure, we would have to adjust many DHCPv4 sources (from | |
6677 | * interface to DHCPv4 lease code), and we would have to update the | |
6678 | * 'hardware' config directive (probably being reverse compatible and | |
6679 | * providing a new upgrade/replacement primitive). This is a little | |
6680 | * too much to change for now. Hopefully we will revisit this before | |
6681 | * hardware types exceeding 8 bits are assigned. | |
6682 | */ | |
6683 | if ((htype & 0xFF00) && !once_htype) { | |
6684 | once_htype = 1; | |
6685 | log_error("Attention: At least one client advertises a " | |
6686 | "hardware type of %d, which exceeds the software " | |
6687 | "limitation of 255.", htype); | |
6688 | } | |
6689 | ||
6690 | return find_hosts_by_haddr(host, htype, chaddr, hlen, MDL); | |
6691 | } | |
6692 | ||
fe5b0fdd DH |
6693 | #endif /* DHCPv6 */ |
6694 |