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98bd7ca0 | 1 | /* |
36c4a037 | 2 | * Copyright (C) 2006-2016 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 | 23 | /* |
b31fe1d5 TM |
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 | |
98bd7ca0 DH |
27 | * attempting to understand a DUID. |
28 | */ | |
29 | ||
b31fe1d5 | 30 | /* |
98bd7ca0 DH |
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) | |
b31fe1d5 TM |
34 | * TODO: support multiple shared_networks on each interface (this |
35 | * will allow the server to issue multiple IPv6 addresses to | |
98bd7ca0 DH |
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 | */ | |
dce576b8 | 73 | u_int32_t renew, rebind, min_prefer, min_valid; |
5279b8f3 | 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 | ||
b31fe1d5 | 96 | /* |
98bd7ca0 DH |
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); | |
34711bb7 | 134 | static struct group *find_group_by_prefix(struct reply_state *reply); |
80c9fdb0 FD |
135 | static isc_result_t reply_process_prefix(struct reply_state *reply, |
136 | struct option_cache *pref); | |
137 | static isc_boolean_t prefix_is_owned(struct reply_state *reply, | |
138 | struct iaddrcidrnet *pref); | |
139 | static isc_result_t find_client_prefix(struct reply_state *reply); | |
140 | static isc_result_t reply_process_try_prefix(struct reply_state *reply, | |
141 | struct iaddrcidrnet *pref); | |
142 | static isc_result_t reply_process_is_prefixed(struct reply_state *reply, | |
80c9fdb0 FD |
143 | struct binding_scope **scope, |
144 | struct group *group); | |
145 | static isc_result_t reply_process_send_prefix(struct reply_state *reply, | |
146 | struct iaddrcidrnet *pref); | |
1d17db44 FD |
147 | static struct iasubopt *prefix_compare(struct reply_state *reply, |
148 | struct iasubopt *alpha, | |
149 | struct iasubopt *beta); | |
ad80055f SR |
150 | static void schedule_lease_timeout_reply(struct reply_state *reply); |
151 | ||
1a006ff6 TM |
152 | static int eval_prefix_mode(int thislen, int preflen, int prefix_mode); |
153 | static isc_result_t pick_v6_prefix_helper(struct reply_state *reply, | |
154 | int prefix_mode); | |
155 | ||
b31fe1d5 TM |
156 | static void unicast_reject(struct data_string *reply_ret, struct packet *packet, |
157 | const struct data_string *client_id, | |
158 | const struct data_string *server_id); | |
159 | ||
160 | static isc_boolean_t is_unicast_option_defined(struct packet *packet); | |
161 | static isc_result_t shared_network_from_requested_addr (struct shared_network | |
162 | **shared, | |
163 | struct packet* packet); | |
164 | static isc_result_t get_first_ia_addr_val (struct packet* packet, int addr_type, | |
165 | struct iaddr* iaddr); | |
166 | ||
dce576b8 TM |
167 | static void |
168 | set_reply_tee_times(struct reply_state* reply, unsigned ia_cursor); | |
169 | ||
ad80055f SR |
170 | /* |
171 | * Schedule lease timeouts for all of the iasubopts in the reply. | |
172 | * This is currently used to schedule timeouts for soft leases. | |
173 | */ | |
174 | ||
175 | static void | |
176 | schedule_lease_timeout_reply(struct reply_state *reply) { | |
177 | struct iasubopt *tmp; | |
178 | int i; | |
179 | ||
180 | /* sanity check the reply */ | |
181 | if ((reply == NULL) || (reply->ia == NULL) || (reply->ia->iasubopt == NULL)) | |
182 | return; | |
183 | ||
184 | /* walk through the list, scheduling as we go */ | |
185 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { | |
186 | tmp = reply->ia->iasubopt[i]; | |
187 | schedule_lease_timeout(tmp->ipv6_pool); | |
188 | } | |
189 | } | |
190 | ||
98bd7ca0 DH |
191 | /* |
192 | * This function returns the time since DUID time start for the | |
193 | * given time_t value. | |
194 | */ | |
195 | static u_int32_t | |
196 | duid_time(time_t when) { | |
197 | /* | |
198 | * This time is modulo 2^32. | |
199 | */ | |
200 | while ((when - DUID_TIME_EPOCH) > 4294967295u) { | |
201 | /* use 2^31 to avoid spurious compiler warnings */ | |
202 | when -= 2147483648u; | |
203 | when -= 2147483648u; | |
204 | } | |
205 | ||
206 | return when - DUID_TIME_EPOCH; | |
207 | } | |
208 | ||
209 | ||
b31fe1d5 | 210 | /* |
98bd7ca0 DH |
211 | * Server DUID. |
212 | * | |
213 | * This must remain the same for the lifetime of this server, because | |
214 | * clients return the server DUID that we sent them in Request packets. | |
215 | * | |
216 | * We pick the server DUID like this: | |
217 | * | |
b31fe1d5 | 218 | * 1. Check dhcpd.conf - any value the administrator has configured |
98bd7ca0 | 219 | * overrides any possible values. |
b31fe1d5 | 220 | * 2. Check the leases.txt - we want to use the previous value if |
98bd7ca0 DH |
221 | * possible. |
222 | * 3. Check if dhcpd.conf specifies a type of server DUID to use, | |
223 | * and generate that type. | |
224 | * 4. Generate a type 1 (time + hardware address) DUID. | |
225 | */ | |
226 | static struct data_string server_duid; | |
227 | ||
228 | /* | |
229 | * Check if the server_duid has been set. | |
230 | */ | |
783259b1 | 231 | isc_boolean_t |
98bd7ca0 DH |
232 | server_duid_isset(void) { |
233 | return (server_duid.data != NULL); | |
234 | } | |
235 | ||
236 | /* | |
237 | * Return the server_duid. | |
238 | */ | |
239 | void | |
240 | copy_server_duid(struct data_string *ds, const char *file, int line) { | |
241 | data_string_copy(ds, &server_duid, file, line); | |
242 | } | |
243 | ||
244 | /* | |
245 | * Set the server DUID to a specified value. This is used when | |
246 | * the server DUID is stored in persistent memory (basically the | |
247 | * leases.txt file). | |
248 | */ | |
249 | void | |
250 | set_server_duid(struct data_string *new_duid) { | |
251 | /* INSIST(new_duid != NULL); */ | |
252 | /* INSIST(new_duid->data != NULL); */ | |
253 | ||
254 | if (server_duid_isset()) { | |
255 | data_string_forget(&server_duid, MDL); | |
256 | } | |
257 | data_string_copy(&server_duid, new_duid, MDL); | |
258 | } | |
259 | ||
260 | ||
261 | /* | |
262 | * Set the server DUID based on the D6O_SERVERID option. This handles | |
b31fe1d5 | 263 | * the case where the administrator explicitly put it in the dhcpd.conf |
98bd7ca0 DH |
264 | * file. |
265 | */ | |
266 | isc_result_t | |
267 | set_server_duid_from_option(void) { | |
268 | struct option_state *opt_state; | |
269 | struct option_cache *oc; | |
270 | struct data_string option_duid; | |
271 | isc_result_t ret_val; | |
272 | ||
273 | opt_state = NULL; | |
274 | if (!option_state_allocate(&opt_state, MDL)) { | |
275 | log_fatal("No memory for server DUID."); | |
276 | } | |
277 | ||
278 | execute_statements_in_scope(NULL, NULL, NULL, NULL, NULL, | |
a7341359 SR |
279 | opt_state, &global_scope, root_group, |
280 | NULL, NULL); | |
98bd7ca0 DH |
281 | |
282 | oc = lookup_option(&dhcpv6_universe, opt_state, D6O_SERVERID); | |
283 | if (oc == NULL) { | |
284 | ret_val = ISC_R_NOTFOUND; | |
285 | } else { | |
286 | memset(&option_duid, 0, sizeof(option_duid)); | |
783259b1 FD |
287 | if (!evaluate_option_cache(&option_duid, NULL, NULL, NULL, |
288 | opt_state, NULL, &global_scope, | |
98bd7ca0 DH |
289 | oc, MDL)) { |
290 | ret_val = ISC_R_UNEXPECTED; | |
291 | } else { | |
292 | set_server_duid(&option_duid); | |
293 | data_string_forget(&option_duid, MDL); | |
294 | ret_val = ISC_R_SUCCESS; | |
295 | } | |
296 | } | |
297 | ||
298 | option_state_dereference(&opt_state, MDL); | |
299 | ||
300 | return ret_val; | |
301 | } | |
302 | ||
303 | /* | |
304 | * DUID layout, as defined in RFC 3315, section 9. | |
b31fe1d5 | 305 | * |
98bd7ca0 DH |
306 | * We support type 1 (hardware address plus time) and type 3 (hardware |
307 | * address). | |
308 | * | |
b31fe1d5 | 309 | * We can support type 2 for specific vendors in the future, if they |
98bd7ca0 DH |
310 | * publish the specification. And of course there may be additional |
311 | * types later. | |
312 | */ | |
313 | static int server_duid_type = DUID_LLT; | |
314 | ||
b31fe1d5 | 315 | /* |
98bd7ca0 DH |
316 | * Set the DUID type. |
317 | */ | |
318 | void | |
319 | set_server_duid_type(int type) { | |
320 | server_duid_type = type; | |
321 | } | |
322 | ||
323 | /* | |
b31fe1d5 | 324 | * Generate a new server DUID. This is done if there was no DUID in |
98bd7ca0 DH |
325 | * the leases.txt or in the dhcpd.conf file. |
326 | */ | |
327 | isc_result_t | |
328 | generate_new_server_duid(void) { | |
329 | struct interface_info *p; | |
330 | u_int32_t time_val; | |
331 | struct data_string generated_duid; | |
332 | ||
333 | /* | |
334 | * Verify we have a type that we support. | |
335 | */ | |
336 | if ((server_duid_type != DUID_LL) && (server_duid_type != DUID_LLT)) { | |
337 | log_error("Invalid DUID type %d specified, " | |
338 | "only LL and LLT types supported", server_duid_type); | |
98bf1607 | 339 | return DHCP_R_INVALIDARG; |
98bd7ca0 DH |
340 | } |
341 | ||
342 | /* | |
343 | * Find an interface with a hardware address. | |
344 | * Any will do. :) | |
345 | */ | |
346 | for (p = interfaces; p != NULL; p = p->next) { | |
347 | if (p->hw_address.hlen > 0) { | |
348 | break; | |
349 | } | |
350 | } | |
351 | if (p == NULL) { | |
352 | return ISC_R_UNEXPECTED; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Build our DUID. | |
357 | */ | |
358 | memset(&generated_duid, 0, sizeof(generated_duid)); | |
359 | if (server_duid_type == DUID_LLT) { | |
360 | time_val = duid_time(time(NULL)); | |
361 | generated_duid.len = 8 + p->hw_address.hlen - 1; | |
783259b1 | 362 | if (!buffer_allocate(&generated_duid.buffer, |
98bd7ca0 DH |
363 | generated_duid.len, MDL)) { |
364 | log_fatal("No memory for server DUID."); | |
365 | } | |
366 | generated_duid.data = generated_duid.buffer->data; | |
367 | putUShort(generated_duid.buffer->data, DUID_LLT); | |
783259b1 | 368 | putUShort(generated_duid.buffer->data + 2, |
98bd7ca0 DH |
369 | p->hw_address.hbuf[0]); |
370 | putULong(generated_duid.buffer->data + 4, time_val); | |
783259b1 | 371 | memcpy(generated_duid.buffer->data + 8, |
98bd7ca0 DH |
372 | p->hw_address.hbuf+1, p->hw_address.hlen-1); |
373 | } else if (server_duid_type == DUID_LL) { | |
374 | generated_duid.len = 4 + p->hw_address.hlen - 1; | |
783259b1 | 375 | if (!buffer_allocate(&generated_duid.buffer, |
98bd7ca0 DH |
376 | generated_duid.len, MDL)) { |
377 | log_fatal("No memory for server DUID."); | |
378 | } | |
379 | generated_duid.data = generated_duid.buffer->data; | |
380 | putUShort(generated_duid.buffer->data, DUID_LL); | |
783259b1 | 381 | putUShort(generated_duid.buffer->data + 2, |
98bd7ca0 | 382 | p->hw_address.hbuf[0]); |
783259b1 | 383 | memcpy(generated_duid.buffer->data + 4, |
98bd7ca0 DH |
384 | p->hw_address.hbuf+1, p->hw_address.hlen-1); |
385 | } else { | |
386 | log_fatal("Unsupported server DUID type %d.", server_duid_type); | |
783259b1 | 387 | } |
98bd7ca0 DH |
388 | |
389 | set_server_duid(&generated_duid); | |
390 | data_string_forget(&generated_duid, MDL); | |
391 | ||
392 | return ISC_R_SUCCESS; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Get the client identifier from the packet. | |
397 | */ | |
398 | isc_result_t | |
399 | get_client_id(struct packet *packet, struct data_string *client_id) { | |
400 | struct option_cache *oc; | |
401 | ||
402 | /* | |
403 | * Verify our client_id structure is empty. | |
404 | */ | |
405 | if ((client_id->data != NULL) || (client_id->len != 0)) { | |
98bf1607 | 406 | return DHCP_R_INVALIDARG; |
98bd7ca0 DH |
407 | } |
408 | ||
409 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_CLIENTID); | |
410 | if (oc == NULL) { | |
411 | return ISC_R_NOTFOUND; | |
412 | } | |
413 | ||
783259b1 | 414 | if (!evaluate_option_cache(client_id, packet, NULL, NULL, |
98bd7ca0 DH |
415 | packet->options, NULL, |
416 | &global_scope, oc, MDL)) { | |
417 | return ISC_R_FAILURE; | |
418 | } | |
419 | ||
420 | return ISC_R_SUCCESS; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Message validation, defined in RFC 3315, sections 15.2, 15.5, 15.7: | |
425 | * | |
426 | * Servers MUST discard any Solicit messages that do not include a | |
427 | * Client Identifier option or that do include a Server Identifier | |
428 | * option. | |
429 | */ | |
430 | int | |
431 | valid_client_msg(struct packet *packet, struct data_string *client_id) { | |
432 | int ret_val; | |
433 | struct option_cache *oc; | |
434 | struct data_string data; | |
435 | ||
436 | ret_val = 0; | |
437 | memset(client_id, 0, sizeof(*client_id)); | |
438 | memset(&data, 0, sizeof(data)); | |
439 | ||
440 | switch (get_client_id(packet, client_id)) { | |
441 | case ISC_R_SUCCESS: | |
442 | break; | |
443 | case ISC_R_NOTFOUND: | |
444 | log_debug("Discarding %s from %s; " | |
783259b1 | 445 | "client identifier missing", |
98bd7ca0 DH |
446 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
447 | piaddr(packet->client_addr)); | |
448 | goto exit; | |
449 | default: | |
450 | log_error("Error processing %s from %s; " | |
451 | "unable to evaluate Client Identifier", | |
452 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
453 | piaddr(packet->client_addr)); | |
454 | goto exit; | |
455 | } | |
456 | ||
457 | /* | |
458 | * Required by RFC 3315, section 15. | |
459 | */ | |
460 | if (packet->unicast) { | |
461 | log_debug("Discarding %s from %s; packet sent unicast " | |
783259b1 | 462 | "(CLIENTID %s)", |
98bd7ca0 DH |
463 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
464 | piaddr(packet->client_addr), | |
c382bc98 | 465 | print_hex_1(client_id->len, client_id->data, 60)); |
98bd7ca0 DH |
466 | goto exit; |
467 | } | |
468 | ||
469 | ||
470 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); | |
471 | if (oc != NULL) { | |
472 | if (evaluate_option_cache(&data, packet, NULL, NULL, | |
783259b1 | 473 | packet->options, NULL, |
98bd7ca0 | 474 | &global_scope, oc, MDL)) { |
783259b1 | 475 | log_debug("Discarding %s from %s; " |
98bd7ca0 | 476 | "server identifier found " |
783259b1 | 477 | "(CLIENTID %s, SERVERID %s)", |
98bd7ca0 DH |
478 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
479 | piaddr(packet->client_addr), | |
783259b1 | 480 | print_hex_1(client_id->len, |
98bd7ca0 DH |
481 | client_id->data, 60), |
482 | print_hex_2(data.len, | |
483 | data.data, 60)); | |
484 | } else { | |
783259b1 | 485 | log_debug("Discarding %s from %s; " |
98bd7ca0 | 486 | "server identifier found " |
783259b1 | 487 | "(CLIENTID %s)", |
98bd7ca0 | 488 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
783259b1 | 489 | print_hex_1(client_id->len, |
98bd7ca0 DH |
490 | client_id->data, 60), |
491 | piaddr(packet->client_addr)); | |
492 | } | |
493 | goto exit; | |
494 | } | |
495 | ||
496 | /* looks good */ | |
497 | ret_val = 1; | |
498 | ||
499 | exit: | |
500 | if (data.len > 0) { | |
501 | data_string_forget(&data, MDL); | |
502 | } | |
503 | if (!ret_val) { | |
504 | if (client_id->len > 0) { | |
505 | data_string_forget(client_id, MDL); | |
506 | } | |
507 | } | |
508 | return ret_val; | |
509 | } | |
510 | ||
511 | /* | |
b31fe1d5 | 512 | * Response validation, defined in RFC 3315, sections 15.4, 15.6, 15.8, |
98bd7ca0 DH |
513 | * 15.9 (slightly different wording, but same meaning): |
514 | * | |
515 | * Servers MUST discard any received Request message that meet any of | |
516 | * the following conditions: | |
517 | * | |
518 | * - the message does not include a Server Identifier option. | |
519 | * - the contents of the Server Identifier option do not match the | |
520 | * server's DUID. | |
521 | * - the message does not include a Client Identifier option. | |
522 | */ | |
523 | int | |
524 | valid_client_resp(struct packet *packet, | |
525 | struct data_string *client_id, | |
c382bc98 SK |
526 | struct data_string *server_id) |
527 | { | |
98bd7ca0 DH |
528 | int ret_val; |
529 | struct option_cache *oc; | |
530 | ||
531 | /* INSIST((duid.data != NULL) && (duid.len > 0)); */ | |
532 | ||
533 | ret_val = 0; | |
534 | memset(client_id, 0, sizeof(*client_id)); | |
535 | memset(server_id, 0, sizeof(*server_id)); | |
536 | ||
537 | switch (get_client_id(packet, client_id)) { | |
538 | case ISC_R_SUCCESS: | |
539 | break; | |
540 | case ISC_R_NOTFOUND: | |
541 | log_debug("Discarding %s from %s; " | |
783259b1 | 542 | "client identifier missing", |
98bd7ca0 DH |
543 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
544 | piaddr(packet->client_addr)); | |
545 | goto exit; | |
546 | default: | |
547 | log_error("Error processing %s from %s; " | |
548 | "unable to evaluate Client Identifier", | |
549 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
550 | piaddr(packet->client_addr)); | |
551 | goto exit; | |
552 | } | |
553 | ||
554 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); | |
555 | if (oc == NULL) { | |
556 | log_debug("Discarding %s from %s: " | |
783259b1 | 557 | "server identifier missing (CLIENTID %s)", |
98bd7ca0 DH |
558 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
559 | piaddr(packet->client_addr), | |
560 | print_hex_1(client_id->len, client_id->data, 60)); | |
561 | goto exit; | |
562 | } | |
783259b1 | 563 | if (!evaluate_option_cache(server_id, packet, NULL, NULL, |
98bd7ca0 DH |
564 | packet->options, NULL, |
565 | &global_scope, oc, MDL)) { | |
566 | log_error("Error processing %s from %s; " | |
567 | "unable to evaluate Server Identifier (CLIENTID %s)", | |
568 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
569 | piaddr(packet->client_addr), | |
570 | print_hex_1(client_id->len, client_id->data, 60)); | |
571 | goto exit; | |
572 | } | |
783259b1 | 573 | if ((server_duid.len != server_id->len) || |
98bd7ca0 | 574 | (memcmp(server_duid.data, server_id->data, server_duid.len) != 0)) { |
783259b1 | 575 | log_debug("Discarding %s from %s; " |
98bd7ca0 | 576 | "not our server identifier " |
783259b1 | 577 | "(CLIENTID %s, SERVERID %s, server DUID %s)", |
98bd7ca0 DH |
578 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
579 | piaddr(packet->client_addr), | |
580 | print_hex_1(client_id->len, client_id->data, 60), | |
581 | print_hex_2(server_id->len, server_id->data, 60), | |
582 | print_hex_3(server_duid.len, server_duid.data, 60)); | |
583 | goto exit; | |
584 | } | |
585 | ||
586 | /* looks good */ | |
587 | ret_val = 1; | |
588 | ||
589 | exit: | |
590 | if (!ret_val) { | |
591 | if (server_id->len > 0) { | |
592 | data_string_forget(server_id, MDL); | |
593 | } | |
594 | if (client_id->len > 0) { | |
595 | data_string_forget(client_id, MDL); | |
596 | } | |
597 | } | |
598 | return ret_val; | |
599 | } | |
600 | ||
601 | /* | |
602 | * Information request validation, defined in RFC 3315, section 15.12: | |
603 | * | |
604 | * Servers MUST discard any received Information-request message that | |
605 | * meets any of the following conditions: | |
606 | * | |
607 | * - The message includes a Server Identifier option and the DUID in | |
608 | * the option does not match the server's DUID. | |
609 | * | |
610 | * - The message includes an IA option. | |
611 | */ | |
612 | int | |
613 | valid_client_info_req(struct packet *packet, struct data_string *server_id) { | |
614 | int ret_val; | |
615 | struct option_cache *oc; | |
c382bc98 SK |
616 | struct data_string client_id; |
617 | char client_id_str[80]; /* print_hex_1() uses maximum 60 characters, | |
618 | plus a few more for extra information */ | |
98bd7ca0 DH |
619 | |
620 | ret_val = 0; | |
621 | memset(server_id, 0, sizeof(*server_id)); | |
0f750c4f | 622 | memset(&client_id, 0, sizeof(client_id)); |
98bd7ca0 | 623 | |
c382bc98 | 624 | /* |
b31fe1d5 | 625 | * Make a string that we can print out to give more |
c382bc98 SK |
626 | * information about the client if we need to. |
627 | * | |
b31fe1d5 TM |
628 | * By RFC 3315, Section 18.1.5 clients SHOULD have a |
629 | * client-id on an Information-request packet, but it | |
c382bc98 SK |
630 | * is not strictly necessary. |
631 | */ | |
632 | if (get_client_id(packet, &client_id) == ISC_R_SUCCESS) { | |
633 | snprintf(client_id_str, sizeof(client_id_str), " (CLIENTID %s)", | |
634 | print_hex_1(client_id.len, client_id.data, 60)); | |
635 | data_string_forget(&client_id, MDL); | |
636 | } else { | |
637 | client_id_str[0] = '\0'; | |
638 | } | |
639 | ||
98bd7ca0 DH |
640 | /* |
641 | * Required by RFC 3315, section 15. | |
642 | */ | |
643 | if (packet->unicast) { | |
c382bc98 | 644 | log_debug("Discarding %s from %s; packet sent unicast%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 | } | |
649 | ||
650 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); | |
651 | if (oc != NULL) { | |
652 | log_debug("Discarding %s from %s; " | |
783259b1 | 653 | "IA_NA option present%s", |
98bd7ca0 | 654 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
c382bc98 | 655 | piaddr(packet->client_addr), client_id_str); |
98bd7ca0 DH |
656 | goto exit; |
657 | } | |
658 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); | |
659 | if (oc != NULL) { | |
660 | log_debug("Discarding %s from %s; " | |
783259b1 | 661 | "IA_TA option present%s", |
98bd7ca0 | 662 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
c382bc98 | 663 | piaddr(packet->client_addr), client_id_str); |
98bd7ca0 DH |
664 | goto exit; |
665 | } | |
1d9774ab FD |
666 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); |
667 | if (oc != NULL) { | |
668 | log_debug("Discarding %s from %s; " | |
783259b1 | 669 | "IA_PD option present%s", |
1d9774ab FD |
670 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
671 | piaddr(packet->client_addr), client_id_str); | |
672 | goto exit; | |
673 | } | |
98bd7ca0 DH |
674 | |
675 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); | |
676 | if (oc != NULL) { | |
783259b1 | 677 | if (!evaluate_option_cache(server_id, packet, NULL, NULL, |
98bd7ca0 DH |
678 | packet->options, NULL, |
679 | &global_scope, oc, MDL)) { | |
680 | log_error("Error processing %s from %s; " | |
c382bc98 | 681 | "unable to evaluate Server Identifier%s", |
98bd7ca0 | 682 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
c382bc98 | 683 | piaddr(packet->client_addr), client_id_str); |
98bd7ca0 DH |
684 | goto exit; |
685 | } | |
783259b1 FD |
686 | if ((server_duid.len != server_id->len) || |
687 | (memcmp(server_duid.data, server_id->data, | |
98bd7ca0 | 688 | server_duid.len) != 0)) { |
783259b1 | 689 | log_debug("Discarding %s from %s; " |
98bd7ca0 | 690 | "not our server identifier " |
783259b1 | 691 | "(SERVERID %s, server DUID %s)%s", |
98bd7ca0 DH |
692 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
693 | piaddr(packet->client_addr), | |
783259b1 | 694 | print_hex_1(server_id->len, |
98bd7ca0 | 695 | server_id->data, 60), |
783259b1 | 696 | print_hex_2(server_duid.len, |
c382bc98 SK |
697 | server_duid.data, 60), |
698 | client_id_str); | |
98bd7ca0 DH |
699 | goto exit; |
700 | } | |
701 | } | |
702 | ||
703 | /* looks good */ | |
704 | ret_val = 1; | |
705 | ||
706 | exit: | |
707 | if (!ret_val) { | |
708 | if (server_id->len > 0) { | |
709 | data_string_forget(server_id, MDL); | |
710 | } | |
711 | } | |
712 | return ret_val; | |
713 | } | |
714 | ||
b31fe1d5 | 715 | /* |
98bd7ca0 DH |
716 | * Options that we want to send, in addition to what was requested |
717 | * via the ORO. | |
718 | */ | |
719 | static const int required_opts[] = { | |
720 | D6O_CLIENTID, | |
721 | D6O_SERVERID, | |
722 | D6O_STATUS_CODE, | |
76db44f9 | 723 | D6O_PREFERENCE, |
98bd7ca0 DH |
724 | 0 |
725 | }; | |
726 | static const int required_opts_solicit[] = { | |
727 | D6O_CLIENTID, | |
728 | D6O_SERVERID, | |
729 | D6O_IA_NA, | |
730 | D6O_IA_TA, | |
1d9774ab | 731 | D6O_IA_PD, |
98bd7ca0 DH |
732 | D6O_RAPID_COMMIT, |
733 | D6O_STATUS_CODE, | |
98bd7ca0 | 734 | D6O_RECONF_ACCEPT, |
76db44f9 | 735 | D6O_PREFERENCE, |
98bd7ca0 DH |
736 | 0 |
737 | }; | |
2b964ac0 FD |
738 | static const int required_opts_agent[] = { |
739 | D6O_INTERFACE_ID, | |
740 | D6O_RELAY_MSG, | |
741 | 0 | |
742 | }; | |
80c9fdb0 | 743 | static const int required_opts_IA[] = { |
1d9774ab FD |
744 | D6O_IAADDR, |
745 | D6O_STATUS_CODE, | |
1d9774ab FD |
746 | 0 |
747 | }; | |
748 | static const int required_opts_IA_PD[] = { | |
749 | D6O_IAPREFIX, | |
750 | D6O_STATUS_CODE, | |
1d9774ab FD |
751 | 0 |
752 | }; | |
98bd7ca0 DH |
753 | static const int required_opts_STATUS_CODE[] = { |
754 | D6O_STATUS_CODE, | |
755 | 0 | |
756 | }; | |
757 | ||
b31fe1d5 TM |
758 | static const int unicast_reject_opts[] = { |
759 | D6O_CLIENTID, | |
760 | D6O_SERVERID, | |
761 | D6O_STATUS_CODE, | |
762 | 0 | |
763 | }; | |
764 | ||
765 | ||
98bd7ca0 | 766 | /* |
8eab95f2 DH |
767 | * Extracts from packet contents an IA_* option, storing the IA structure |
768 | * in its entirety in enc_opt_data, and storing any decoded DHCPv6 options | |
769 | * in enc_opt_state for later lookup and evaluation. The 'offset' indicates | |
770 | * where in the IA_* the DHCPv6 options commence. | |
98bd7ca0 DH |
771 | */ |
772 | static int | |
783259b1 | 773 | get_encapsulated_IA_state(struct option_state **enc_opt_state, |
98bd7ca0 DH |
774 | struct data_string *enc_opt_data, |
775 | struct packet *packet, | |
8eab95f2 DH |
776 | struct option_cache *oc, |
777 | int offset) | |
c382bc98 | 778 | { |
b31fe1d5 | 779 | /* |
98bd7ca0 DH |
780 | * Get the raw data for the encapsulated options. |
781 | */ | |
782 | memset(enc_opt_data, 0, sizeof(*enc_opt_data)); | |
783 | if (!evaluate_option_cache(enc_opt_data, packet, | |
784 | NULL, NULL, packet->options, NULL, | |
785 | &global_scope, oc, MDL)) { | |
786 | log_error("get_encapsulated_IA_state: " | |
787 | "error evaluating raw option."); | |
788 | return 0; | |
789 | } | |
8eab95f2 | 790 | if (enc_opt_data->len < offset) { |
98bd7ca0 DH |
791 | log_error("get_encapsulated_IA_state: raw option too small."); |
792 | data_string_forget(enc_opt_data, MDL); | |
793 | return 0; | |
794 | } | |
795 | ||
796 | /* | |
b31fe1d5 | 797 | * Now create the option state structure, and pass it to the |
98bd7ca0 DH |
798 | * function that parses options. |
799 | */ | |
800 | *enc_opt_state = NULL; | |
801 | if (!option_state_allocate(enc_opt_state, MDL)) { | |
802 | log_error("get_encapsulated_IA_state: no memory for options."); | |
803 | data_string_forget(enc_opt_data, MDL); | |
804 | return 0; | |
805 | } | |
783259b1 | 806 | if (!parse_option_buffer(*enc_opt_state, |
b31fe1d5 | 807 | enc_opt_data->data + offset, |
8eab95f2 | 808 | enc_opt_data->len - offset, |
98bd7ca0 DH |
809 | &dhcpv6_universe)) { |
810 | log_error("get_encapsulated_IA_state: error parsing options."); | |
811 | option_state_dereference(enc_opt_state, MDL); | |
812 | data_string_forget(enc_opt_data, MDL); | |
813 | return 0; | |
814 | } | |
815 | ||
816 | return 1; | |
817 | } | |
818 | ||
819 | static int | |
820 | set_status_code(u_int16_t status_code, const char *status_message, | |
c382bc98 SK |
821 | struct option_state *opt_state) |
822 | { | |
98bd7ca0 DH |
823 | struct data_string d; |
824 | int ret_val; | |
825 | ||
826 | memset(&d, 0, sizeof(d)); | |
827 | d.len = sizeof(status_code) + strlen(status_message); | |
828 | if (!buffer_allocate(&d.buffer, d.len, MDL)) { | |
829 | log_fatal("set_status_code: no memory for status code."); | |
830 | } | |
831 | d.data = d.buffer->data; | |
832 | putUShort(d.buffer->data, status_code); | |
b31fe1d5 | 833 | memcpy(d.buffer->data + sizeof(status_code), |
98bd7ca0 | 834 | status_message, d.len - sizeof(status_code)); |
b31fe1d5 TM |
835 | if (!save_option_buffer(&dhcpv6_universe, opt_state, |
836 | d.buffer, (unsigned char *)d.data, d.len, | |
98bd7ca0 DH |
837 | D6O_STATUS_CODE, 0)) { |
838 | log_error("set_status_code: error saving status code."); | |
839 | ret_val = 0; | |
840 | } else { | |
841 | ret_val = 1; | |
842 | } | |
843 | data_string_forget(&d, MDL); | |
844 | return ret_val; | |
845 | } | |
846 | ||
250f7134 SR |
847 | void check_pool6_threshold(struct reply_state *reply, |
848 | struct iasubopt *lease) | |
849 | { | |
850 | struct ipv6_pond *pond; | |
fb98e02e TM |
851 | isc_uint64_t used, count, high_threshold; |
852 | int poolhigh = 0, poollow = 0; | |
250f7134 SR |
853 | char *shared_name = "no name"; |
854 | char tmp_addr[INET6_ADDRSTRLEN]; | |
855 | ||
856 | if ((lease->ipv6_pool == NULL) || (lease->ipv6_pool->ipv6_pond == NULL)) | |
857 | return; | |
858 | pond = lease->ipv6_pool->ipv6_pond; | |
859 | ||
fb98e02e TM |
860 | /* If the address range is too large to track, just skip all this. */ |
861 | if (pond->jumbo_range == 1) { | |
862 | return; | |
863 | } | |
864 | ||
250f7134 SR |
865 | count = pond->num_total; |
866 | used = pond->num_active; | |
867 | ||
fb98e02e TM |
868 | /* get network name for logging */ |
869 | if ((pond->shared_network != NULL) && | |
870 | (pond->shared_network->name != NULL)) { | |
871 | shared_name = pond->shared_network->name; | |
872 | } | |
873 | ||
250f7134 SR |
874 | /* The logged flag indicates if we have already crossed the high |
875 | * threshold and emitted a log message. If it is set we check to | |
876 | * see if we have re-crossed the low threshold and need to reset | |
877 | * things. When we cross the high threshold we determine what | |
878 | * the low threshold is and save it into the low_threshold value. | |
879 | * When we cross that threshold we reset the logged flag and | |
880 | * the low_threshold to 0 which allows the high threshold message | |
881 | * to be emitted once again. | |
882 | * if we haven't recrossed the boundry we don't need to do anything. | |
883 | */ | |
884 | if (pond->logged !=0) { | |
885 | if (used <= pond->low_threshold) { | |
886 | pond->low_threshold = 0; | |
887 | pond->logged = 0; | |
888 | log_error("Pool threshold reset - shared subnet: %s; " | |
fb98e02e | 889 | "address: %s; low threshold %llu/%llu.", |
250f7134 SR |
890 | shared_name, |
891 | inet_ntop(AF_INET6, &lease->addr, | |
892 | tmp_addr, sizeof(tmp_addr)), | |
893 | used, count); | |
894 | } | |
895 | return; | |
896 | } | |
897 | ||
898 | /* find the high threshold */ | |
899 | if (get_option_int(&poolhigh, &server_universe, reply->packet, NULL, | |
900 | NULL, reply->packet->options, reply->opt_state, | |
901 | reply->opt_state, &lease->scope, | |
902 | SV_LOG_THRESHOLD_HIGH, MDL) == 0) { | |
903 | /* no threshold bail out */ | |
904 | return; | |
905 | } | |
906 | ||
907 | /* We do have a threshold for this pool, see if its valid */ | |
908 | if ((poolhigh <= 0) || (poolhigh > 100)) { | |
909 | /* not valid */ | |
910 | return; | |
911 | } | |
912 | ||
913 | /* we have a valid value, have we exceeded it */ | |
fb98e02e | 914 | high_threshold = FIND_POND6_PERCENT(count, poolhigh); |
250f7134 SR |
915 | if (used < high_threshold) { |
916 | /* nope, no more to do */ | |
917 | return; | |
918 | } | |
919 | ||
920 | /* we've exceeded it, output a message */ | |
250f7134 | 921 | log_error("Pool threshold exceeded - shared subnet: %s; " |
fb98e02e | 922 | "address: %s; high threshold %d%% %llu/%llu.", |
250f7134 SR |
923 | shared_name, |
924 | inet_ntop(AF_INET6, &lease->addr, tmp_addr, sizeof(tmp_addr)), | |
925 | poolhigh, used, count); | |
926 | ||
927 | /* handle the low threshold now, if we don't | |
928 | * have one we default to 0. */ | |
929 | if ((get_option_int(&poollow, &server_universe, reply->packet, NULL, | |
930 | NULL, reply->packet->options, reply->opt_state, | |
931 | reply->opt_state, &lease->scope, | |
932 | SV_LOG_THRESHOLD_LOW, MDL) == 0) || | |
933 | (poollow > 100)) { | |
934 | poollow = 0; | |
935 | } | |
936 | ||
937 | /* | |
938 | * If the low theshold is higher than the high threshold we continue to log | |
939 | * If it isn't then we set the flag saying we already logged and determine | |
940 | * what the reset threshold is. | |
941 | */ | |
942 | if (poollow < poolhigh) { | |
943 | pond->logged = 1; | |
fb98e02e | 944 | pond->low_threshold = FIND_POND6_PERCENT(count, poollow); |
250f7134 SR |
945 | } |
946 | } | |
947 | ||
98bd7ca0 DH |
948 | /* |
949 | * We have a set of operations we do to set up the reply packet, which | |
950 | * is the same for many message types. | |
951 | */ | |
952 | static int | |
953 | start_reply(struct packet *packet, | |
b31fe1d5 | 954 | const struct data_string *client_id, |
98bd7ca0 DH |
955 | const struct data_string *server_id, |
956 | struct option_state **opt_state, | |
c382bc98 SK |
957 | struct dhcpv6_packet *reply) |
958 | { | |
98bd7ca0 | 959 | struct option_cache *oc; |
28868515 | 960 | const unsigned char *server_id_data; |
98bd7ca0 DH |
961 | int server_id_len; |
962 | ||
98bd7ca0 DH |
963 | /* |
964 | * Build our option state for reply. | |
965 | */ | |
966 | *opt_state = NULL; | |
967 | if (!option_state_allocate(opt_state, MDL)) { | |
968 | log_error("start_reply: no memory for option_state."); | |
969 | return 0; | |
970 | } | |
5279b8f3 DH |
971 | execute_statements_in_scope(NULL, packet, NULL, NULL, |
972 | packet->options, *opt_state, | |
a7341359 | 973 | &global_scope, root_group, NULL, NULL); |
98bd7ca0 | 974 | |
5279b8f3 DH |
975 | /* |
976 | * A small bit of special handling for Solicit messages. | |
977 | * | |
978 | * We could move the logic into a flag, but for now just check | |
979 | * explicitly. | |
980 | */ | |
981 | if (packet->dhcpv6_msg_type == DHCPV6_SOLICIT) { | |
982 | reply->msg_type = DHCPV6_ADVERTISE; | |
983 | ||
984 | /* | |
985 | * If: | |
986 | * - this message type supports rapid commit (Solicit), and | |
987 | * - the server is configured to supply a rapid commit, and | |
988 | * - the client requests a rapid commit, | |
989 | * Then we add a rapid commit option, and send Reply (instead | |
990 | * of an Advertise). | |
991 | */ | |
992 | oc = lookup_option(&dhcpv6_universe, | |
993 | *opt_state, D6O_RAPID_COMMIT); | |
994 | if (oc != NULL) { | |
995 | oc = lookup_option(&dhcpv6_universe, | |
996 | packet->options, D6O_RAPID_COMMIT); | |
997 | if (oc != NULL) { | |
a8ac02a4 | 998 | /* Rapid-commit in action. */ |
5279b8f3 | 999 | reply->msg_type = DHCPV6_REPLY; |
a8ac02a4 FD |
1000 | } else { |
1001 | /* Don't want a rapid-commit in advertise. */ | |
1002 | delete_option(&dhcpv6_universe, | |
1003 | *opt_state, D6O_RAPID_COMMIT); | |
5279b8f3 DH |
1004 | } |
1005 | } | |
a8ac02a4 | 1006 | } else { |
5279b8f3 | 1007 | reply->msg_type = DHCPV6_REPLY; |
a8ac02a4 FD |
1008 | /* Delete the rapid-commit from the sent options. */ |
1009 | oc = lookup_option(&dhcpv6_universe, | |
1010 | *opt_state, D6O_RAPID_COMMIT); | |
1011 | if (oc != NULL) { | |
1012 | delete_option(&dhcpv6_universe, | |
1013 | *opt_state, D6O_RAPID_COMMIT); | |
1014 | } | |
1015 | } | |
5279b8f3 | 1016 | |
b31fe1d5 | 1017 | /* |
5279b8f3 DH |
1018 | * Use the client's transaction identifier for the reply. |
1019 | */ | |
b31fe1d5 | 1020 | memcpy(reply->transaction_id, packet->dhcpv6_transaction_id, |
5279b8f3 DH |
1021 | sizeof(reply->transaction_id)); |
1022 | ||
b31fe1d5 | 1023 | /* |
98bd7ca0 DH |
1024 | * RFC 3315, section 18.2 says we need server identifier and |
1025 | * client identifier. | |
1026 | * | |
1027 | * If the server ID is defined via the configuration file, then | |
b31fe1d5 | 1028 | * it will already be present in the option state at this point, |
98bd7ca0 DH |
1029 | * so we don't need to set it. |
1030 | * | |
b31fe1d5 | 1031 | * If we have a server ID passed in from the caller, |
98bd7ca0 DH |
1032 | * use that, otherwise use the global DUID. |
1033 | */ | |
1034 | oc = lookup_option(&dhcpv6_universe, *opt_state, D6O_SERVERID); | |
1035 | if (oc == NULL) { | |
1036 | if (server_id == NULL) { | |
28868515 | 1037 | server_id_data = server_duid.data; |
98bd7ca0 DH |
1038 | server_id_len = server_duid.len; |
1039 | } else { | |
28868515 | 1040 | server_id_data = server_id->data; |
98bd7ca0 DH |
1041 | server_id_len = server_id->len; |
1042 | } | |
b31fe1d5 | 1043 | if (!save_option_buffer(&dhcpv6_universe, *opt_state, |
28868515 SK |
1044 | NULL, (unsigned char *)server_id_data, |
1045 | server_id_len, D6O_SERVERID, 0)) { | |
98bd7ca0 DH |
1046 | log_error("start_reply: " |
1047 | "error saving server identifier."); | |
1048 | return 0; | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | if (client_id->buffer != NULL) { | |
b31fe1d5 TM |
1053 | if (!save_option_buffer(&dhcpv6_universe, *opt_state, |
1054 | client_id->buffer, | |
1055 | (unsigned char *)client_id->data, | |
1056 | client_id->len, | |
98bd7ca0 DH |
1057 | D6O_CLIENTID, 0)) { |
1058 | log_error("start_reply: error saving " | |
1059 | "client identifier."); | |
1060 | return 0; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * If the client accepts reconfiguration, let it know that we | |
1066 | * will send them. | |
1067 | * | |
1068 | * Note: we don't actually do this yet, but DOCSIS requires we | |
1069 | * claim to. | |
1070 | */ | |
1071 | oc = lookup_option(&dhcpv6_universe, packet->options, | |
1072 | D6O_RECONF_ACCEPT); | |
1073 | if (oc != NULL) { | |
1074 | if (!save_option_buffer(&dhcpv6_universe, *opt_state, | |
b31fe1d5 | 1075 | NULL, (unsigned char *)"", 0, |
28868515 | 1076 | D6O_RECONF_ACCEPT, 0)) { |
98bd7ca0 DH |
1077 | log_error("start_reply: " |
1078 | "error saving RECONF_ACCEPT option."); | |
1079 | option_state_dereference(opt_state, MDL); | |
1080 | return 0; | |
1081 | } | |
1082 | } | |
1083 | ||
98bd7ca0 DH |
1084 | return 1; |
1085 | } | |
1086 | ||
1087 | /* | |
5279b8f3 | 1088 | * Try to get the IPv6 address the client asked for from the |
98bd7ca0 DH |
1089 | * pool. |
1090 | * | |
1091 | * addr is the result (should be a pointer to NULL on entry) | |
1092 | * pool is the pool to search in | |
1093 | * requested_addr is the address the client wants | |
1094 | */ | |
1095 | static isc_result_t | |
1d17db44 | 1096 | try_client_v6_address(struct iasubopt **addr, |
98bd7ca0 | 1097 | struct ipv6_pool *pool, |
c382bc98 SK |
1098 | const struct data_string *requested_addr) |
1099 | { | |
98bd7ca0 DH |
1100 | struct in6_addr tmp_addr; |
1101 | isc_result_t result; | |
98bd7ca0 DH |
1102 | |
1103 | if (requested_addr->len < sizeof(tmp_addr)) { | |
98bf1607 | 1104 | return DHCP_R_INVALIDARG; |
98bd7ca0 DH |
1105 | } |
1106 | memcpy(&tmp_addr, requested_addr->data, sizeof(tmp_addr)); | |
1107 | if (IN6_IS_ADDR_UNSPECIFIED(&tmp_addr)) { | |
1108 | return ISC_R_FAILURE; | |
1109 | } | |
1110 | ||
1aa0fe5e DH |
1111 | /* |
1112 | * The address is not covered by this (or possibly any) dynamic | |
1113 | * range. | |
1114 | */ | |
9322442f | 1115 | if (!ipv6_in_pool(&tmp_addr, pool)) { |
1aa0fe5e | 1116 | return ISC_R_ADDRNOTAVAIL; |
98bd7ca0 DH |
1117 | } |
1118 | ||
1119 | if (lease6_exists(pool, &tmp_addr)) { | |
1120 | return ISC_R_ADDRINUSE; | |
1121 | } | |
1122 | ||
1d17db44 | 1123 | result = iasubopt_allocate(addr, MDL); |
98bd7ca0 DH |
1124 | if (result != ISC_R_SUCCESS) { |
1125 | return result; | |
1126 | } | |
1127 | (*addr)->addr = tmp_addr; | |
9322442f | 1128 | (*addr)->plen = 0; |
98bd7ca0 | 1129 | |
5d89d60f FD |
1130 | /* Default is soft binding for 2 minutes. */ |
1131 | result = add_lease6(pool, *addr, cur_time + 120); | |
98bd7ca0 | 1132 | if (result != ISC_R_SUCCESS) { |
1d17db44 | 1133 | iasubopt_dereference(addr, MDL); |
98bd7ca0 DH |
1134 | } |
1135 | return result; | |
1136 | } | |
1137 | ||
01fa619f SR |
1138 | |
1139 | /*! | |
98bd7ca0 | 1140 | * |
01fa619f SR |
1141 | * \brief Get an IPv6 address for the client. |
1142 | * | |
1143 | * Attempt to find a usable address for the client. We walk through | |
1144 | * the ponds checking for permit and deny then through the pools | |
1145 | * seeing if they have an available address. | |
1146 | * | |
1147 | * \param reply = the state structure for the current work on this request | |
1148 | * if we create a lease we return it using reply->lease | |
1149 | * | |
1150 | * \return | |
1151 | * ISC_R_SUCCESS = we were able to find an address and are returning a | |
1152 | * pointer to the lease | |
1153 | * ISC_R_NORESOURCES = there don't appear to be any free addresses. This | |
1154 | * is probabalistic. We don't exhaustively try the | |
1155 | * address range, instead we hash the duid and if | |
1156 | * the address derived from the hash is in use we | |
1157 | * hash the address. After a number of failures we | |
1158 | * conclude the pool is basically full. | |
98bd7ca0 | 1159 | */ |
b31fe1d5 | 1160 | static isc_result_t |
01fa619f | 1161 | pick_v6_address(struct reply_state *reply) |
c382bc98 | 1162 | { |
01fa619f SR |
1163 | struct ipv6_pool *p = NULL; |
1164 | struct ipv6_pond *pond; | |
98bd7ca0 DH |
1165 | int i; |
1166 | int start_pool; | |
28868515 | 1167 | unsigned int attempts; |
1b5053b5 | 1168 | char tmp_buf[INET6_ADDRSTRLEN]; |
01fa619f | 1169 | struct iasubopt **addr = &reply->lease; |
fb98e02e TM |
1170 | isc_uint64_t total = 0; |
1171 | isc_uint64_t active = 0; | |
1172 | isc_uint64_t abandoned = 0; | |
1173 | int jumbo_range = 0; | |
1174 | char *shared_name = (reply->shared->name ? | |
1175 | reply->shared->name : "(no name)"); | |
98bd7ca0 | 1176 | |
98bd7ca0 | 1177 | /* |
01fa619f SR |
1178 | * Do a quick walk through of the ponds and pools |
1179 | * to see if we have any NA address pools | |
98bd7ca0 | 1180 | */ |
01fa619f SR |
1181 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { |
1182 | if (pond->ipv6_pools == NULL) | |
1183 | continue; | |
1184 | ||
1185 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { | |
1186 | if (p->pool_type == D6O_IA_NA) | |
1187 | break; | |
80c9fdb0 | 1188 | } |
01fa619f | 1189 | if (p != NULL) |
80c9fdb0 | 1190 | break; |
80c9fdb0 | 1191 | } |
98bd7ca0 | 1192 | |
01fa619f SR |
1193 | /* If we get here and p is NULL we have no useful pools */ |
1194 | if (p == NULL) { | |
1195 | log_debug("Unable to pick client address: " | |
1196 | "no IPv6 pools on this shared network"); | |
1197 | return ISC_R_NORESOURCES; | |
1198 | } | |
b31fe1d5 | 1199 | |
98bd7ca0 | 1200 | /* |
01fa619f SR |
1201 | * We have at least one pool that could provide an address |
1202 | * Now we walk through the ponds and pools again and check | |
1203 | * to see if the client is permitted and if an address is | |
1204 | * available | |
b31fe1d5 | 1205 | * |
01fa619f SR |
1206 | * Within a given pond we start looking at the last pool we |
1207 | * allocated from, unless it had a collision trying to allocate | |
1208 | * an address. This will tend to move us into less-filled pools. | |
1209 | */ | |
1210 | ||
1211 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
f48dfdf1 | 1212 | isc_result_t result = ISC_R_FAILURE; |
fb98e02e | 1213 | |
01fa619f SR |
1214 | if (((pond->prohibit_list != NULL) && |
1215 | (permitted(reply->packet, pond->prohibit_list))) || | |
1216 | ((pond->permit_list != NULL) && | |
1217 | (!permitted(reply->packet, pond->permit_list)))) | |
1218 | continue; | |
1219 | ||
1220 | start_pool = pond->last_ipv6_pool; | |
1221 | i = start_pool; | |
1222 | do { | |
1223 | p = pond->ipv6_pools[i]; | |
fb98e02e TM |
1224 | if (p->pool_type == D6O_IA_NA) { |
1225 | result = create_lease6(p, addr, &attempts, | |
1226 | &reply->ia->iaid_duid, | |
1227 | cur_time + 120); | |
1228 | if (result == ISC_R_SUCCESS) { | |
1229 | /* | |
1230 | * Record the pool used (or next one if | |
1231 | * there was a collision). | |
1232 | */ | |
1233 | if (attempts > 1) { | |
1234 | i++; | |
1235 | if (pond->ipv6_pools[i] | |
1236 | == NULL) { | |
1237 | i = 0; | |
1238 | } | |
01fa619f | 1239 | } |
98bd7ca0 | 1240 | |
fb98e02e TM |
1241 | pond->last_ipv6_pool = i; |
1242 | ||
1243 | log_debug("Picking pool address %s", | |
1244 | inet_ntop(AF_INET6, | |
1245 | &((*addr)->addr), | |
1246 | tmp_buf, sizeof(tmp_buf))); | |
1247 | return (ISC_R_SUCCESS); | |
1248 | } | |
01fa619f | 1249 | } |
98bd7ca0 | 1250 | |
01fa619f SR |
1251 | i++; |
1252 | if (pond->ipv6_pools[i] == NULL) { | |
1253 | i = 0; | |
1254 | } | |
1255 | } while (i != start_pool); | |
fb98e02e TM |
1256 | |
1257 | if (result == ISC_R_NORESOURCES) { | |
1258 | jumbo_range += pond->jumbo_range; | |
1259 | total += pond->num_total; | |
1260 | active += pond->num_active; | |
1261 | abandoned += pond->num_abandoned; | |
1262 | } | |
01fa619f | 1263 | } |
98bd7ca0 DH |
1264 | |
1265 | /* | |
1266 | * If we failed to pick an IPv6 address from any of the subnets. | |
1267 | * Presumably that means we have no addresses for the client. | |
1268 | */ | |
fb98e02e TM |
1269 | if (jumbo_range != 0) { |
1270 | log_debug("Unable to pick client address: " | |
1271 | "no addresses available - shared network %s: " | |
1272 | " 2^64-1 < total, %llu active, %llu abandoned", | |
1273 | shared_name, active - abandoned, abandoned); | |
1274 | } else { | |
1275 | log_debug("Unable to pick client address: " | |
1276 | "no addresses available - shared network %s: " | |
1277 | "%llu total, %llu active, %llu abandoned", | |
1278 | shared_name, total, active - abandoned, abandoned); | |
1279 | } | |
1280 | ||
98bd7ca0 DH |
1281 | return ISC_R_NORESOURCES; |
1282 | } | |
1283 | ||
80c9fdb0 FD |
1284 | /* |
1285 | * Try to get the IPv6 prefix the client asked for from the | |
1286 | * prefix pool. | |
1287 | * | |
1288 | * pref is the result (should be a pointer to NULL on entry) | |
9322442f | 1289 | * pool is the prefix pool to search in |
80c9fdb0 FD |
1290 | * requested_pref is the address the client wants |
1291 | */ | |
1292 | static isc_result_t | |
1d17db44 | 1293 | try_client_v6_prefix(struct iasubopt **pref, |
9322442f | 1294 | struct ipv6_pool *pool, |
80c9fdb0 FD |
1295 | const struct data_string *requested_pref) |
1296 | { | |
1297 | u_int8_t tmp_plen; | |
1298 | struct in6_addr tmp_pref; | |
1299 | struct iaddr ia; | |
1300 | isc_result_t result; | |
1301 | ||
1302 | if (requested_pref->len < sizeof(tmp_plen) + sizeof(tmp_pref)) { | |
98bf1607 | 1303 | return DHCP_R_INVALIDARG; |
80c9fdb0 FD |
1304 | } |
1305 | tmp_plen = (int) requested_pref->data[0]; | |
d19fa5a1 SR |
1306 | if ((tmp_plen < 3) || (tmp_plen > 128) || |
1307 | ((int)tmp_plen != pool->units)) { | |
80c9fdb0 FD |
1308 | return ISC_R_FAILURE; |
1309 | } | |
1310 | memcpy(&tmp_pref, requested_pref->data + 1, sizeof(tmp_pref)); | |
1311 | if (IN6_IS_ADDR_UNSPECIFIED(&tmp_pref)) { | |
1312 | return ISC_R_FAILURE; | |
1313 | } | |
1314 | ia.len = 16; | |
1315 | memcpy(&ia.iabuf, &tmp_pref, 16); | |
1316 | if (!is_cidr_mask_valid(&ia, (int) tmp_plen)) { | |
1317 | return ISC_R_FAILURE; | |
1318 | } | |
1319 | ||
d19fa5a1 SR |
1320 | if (!ipv6_in_pool(&tmp_pref, pool)) { |
1321 | return ISC_R_ADDRNOTAVAIL; | |
80c9fdb0 FD |
1322 | } |
1323 | ||
9322442f | 1324 | if (prefix6_exists(pool, &tmp_pref, tmp_plen)) { |
80c9fdb0 FD |
1325 | return ISC_R_ADDRINUSE; |
1326 | } | |
1327 | ||
1d17db44 | 1328 | result = iasubopt_allocate(pref, MDL); |
80c9fdb0 FD |
1329 | if (result != ISC_R_SUCCESS) { |
1330 | return result; | |
1331 | } | |
9322442f | 1332 | (*pref)->addr = tmp_pref; |
80c9fdb0 FD |
1333 | (*pref)->plen = tmp_plen; |
1334 | ||
5d89d60f | 1335 | /* Default is soft binding for 2 minutes. */ |
9322442f | 1336 | result = add_lease6(pool, *pref, cur_time + 120); |
80c9fdb0 | 1337 | if (result != ISC_R_SUCCESS) { |
1d17db44 | 1338 | iasubopt_dereference(pref, MDL); |
80c9fdb0 FD |
1339 | } |
1340 | return result; | |
1341 | } | |
1342 | ||
01fa619f | 1343 | /*! |
80c9fdb0 | 1344 | * |
01fa619f SR |
1345 | * \brief Get an IPv6 prefix for the client. |
1346 | * | |
1a006ff6 TM |
1347 | * Attempt to find a usable prefix for the client. Based upon the prefix |
1348 | * length mode and the plen supplied by the client (if one), we make one | |
1349 | * or more calls to pick_v6_prefix_helper() to find a prefix as follows: | |
1350 | * | |
1351 | * PLM_IGNORE or client specifies a plen of zero, use the first available | |
1352 | * prefix regardless of it's length. | |
1353 | * | |
1354 | * PLM_PREFER – look for an exact match to client's plen first, if none | |
1355 | * found, use the first available prefix of any length | |
1356 | * | |
1357 | * PLM_EXACT – look for an exact match first, if none found then fail. This | |
1358 | * is the default behavior. | |
1359 | * | |
1360 | * PLM_MAXIMUM - look for an exact match first, then the first available whose | |
1361 | * prefix length is less than client's plen, otherwise fail. | |
1362 | * | |
1363 | * PLM_MINIMUM - look for an exact match first, then the first available whose | |
1364 | * prefix length is greater than client's plen, otherwise fail. | |
1365 | * | |
1366 | * Note that the selection mode is configurable at the global scope only via | |
1367 | * prefix-len-mode. | |
01fa619f SR |
1368 | * |
1369 | * \param reply = the state structure for the current work on this request | |
1370 | * if we create a lease we return it using reply->lease | |
1371 | * | |
1372 | * \return | |
1373 | * ISC_R_SUCCESS = we were able to find an prefix and are returning a | |
1374 | * pointer to the lease | |
1375 | * ISC_R_NORESOURCES = there don't appear to be any free addresses. This | |
1376 | * is probabalistic. We don't exhaustively try the | |
1377 | * address range, instead we hash the duid and if | |
1378 | * the address derived from the hash is in use we | |
1379 | * hash the address. After a number of failures we | |
1380 | * conclude the pool is basically full. | |
80c9fdb0 FD |
1381 | */ |
1382 | static isc_result_t | |
1a006ff6 TM |
1383 | pick_v6_prefix(struct reply_state *reply) { |
1384 | struct ipv6_pool *p = NULL; | |
1385 | struct ipv6_pond *pond; | |
1386 | int i; | |
1387 | isc_result_t result; | |
80c9fdb0 FD |
1388 | |
1389 | /* | |
01fa619f SR |
1390 | * Do a quick walk through of the ponds and pools |
1391 | * to see if we have any prefix pools | |
1a006ff6 | 1392 | */ |
01fa619f SR |
1393 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { |
1394 | if (pond->ipv6_pools == NULL) | |
1395 | continue; | |
1396 | ||
1397 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { | |
1398 | if (p->pool_type == D6O_IA_PD) | |
1399 | break; | |
1400 | } | |
1401 | if (p != NULL) | |
1402 | break; | |
1403 | } | |
1404 | ||
1405 | /* If we get here and p is NULL we have no useful pools */ | |
1406 | if (p == NULL) { | |
80c9fdb0 | 1407 | log_debug("Unable to pick client prefix: " |
9322442f | 1408 | "no IPv6 pools on this shared network"); |
80c9fdb0 FD |
1409 | return ISC_R_NORESOURCES; |
1410 | } | |
1411 | ||
1a006ff6 TM |
1412 | if (reply->preflen <= 0) { |
1413 | /* If we didn't get a plen (-1) or client plen is 0, then just | |
1414 | * select first available (same as PLM_INGORE) */ | |
1415 | result = pick_v6_prefix_helper(reply, PLM_IGNORE); | |
1416 | } else { | |
1417 | switch (prefix_length_mode) { | |
1418 | case PLM_PREFER: | |
1419 | /* First we look for an exact match, if not found | |
1420 | * then first available */ | |
1421 | result = pick_v6_prefix_helper(reply, PLM_EXACT); | |
1422 | if (result != ISC_R_SUCCESS) { | |
1423 | result = pick_v6_prefix_helper(reply, | |
1424 | PLM_IGNORE); | |
1425 | } | |
1426 | break; | |
1427 | ||
1428 | case PLM_EXACT: | |
1429 | /* Match exactly or fail */ | |
1430 | result = pick_v6_prefix_helper(reply, PLM_EXACT); | |
1431 | break; | |
1432 | ||
1433 | case PLM_MINIMUM: | |
1434 | case PLM_MAXIMUM: | |
1435 | /* First we look for an exact match, if not found | |
1436 | * then first available by mode */ | |
1437 | result = pick_v6_prefix_helper(reply, PLM_EXACT); | |
1438 | if (result != ISC_R_SUCCESS) { | |
1439 | result = pick_v6_prefix_helper(reply, | |
1440 | prefix_length_mode); | |
1441 | } | |
1442 | break; | |
1443 | ||
1444 | default: | |
1445 | /* First available */ | |
1446 | result = pick_v6_prefix_helper(reply, PLM_IGNORE); | |
1447 | break; | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | if (result == ISC_R_SUCCESS) { | |
1452 | char tmp_buf[INET6_ADDRSTRLEN]; | |
1453 | ||
1454 | log_debug("Picking pool prefix %s/%u", | |
1455 | inet_ntop(AF_INET6, &(reply->lease->addr), | |
1456 | tmp_buf, sizeof(tmp_buf)), | |
1457 | (unsigned)(reply->lease->plen)); | |
1458 | return (ISC_R_SUCCESS); | |
1459 | } | |
1460 | ||
80c9fdb0 | 1461 | /* |
1a006ff6 TM |
1462 | * If we failed to pick an IPv6 prefix |
1463 | * Presumably that means we have no prefixes for the client. | |
1464 | */ | |
1465 | log_debug("Unable to pick client prefix: no prefixes available"); | |
1466 | return ISC_R_NORESOURCES; | |
1467 | } | |
1468 | ||
1469 | /*! | |
1470 | * | |
1471 | * \brief Get an IPv6 prefix for the client based upon selection mode. | |
1472 | * | |
1473 | * We walk through the ponds checking for permit and deny. If a pond is | |
1474 | * permissable to use, loop through its PD pools checking prefix lengths | |
1475 | * against the client plen based on the prefix length mode, looking for | |
1476 | * available prefixes. | |
1477 | * | |
1478 | * \param reply = the state structure for the current work on this request | |
1479 | * if we create a lease we return it using reply->lease | |
1480 | * \prefix_mode = selection mode to use | |
1481 | * | |
1482 | * \return | |
1483 | * ISC_R_SUCCESS = we were able to find a prefix and are returning a | |
1484 | * pointer to the lease | |
1485 | * ISC_R_NORESOURCES = there don't appear to be any free addresses. This | |
1486 | * is probabalistic. We don't exhaustively try the | |
1487 | * address range, instead we hash the duid and if | |
1488 | * the address derived from the hash is in use we | |
1489 | * hash the address. After a number of failures we | |
1490 | * conclude the pool is basically full. | |
1491 | */ | |
1492 | isc_result_t | |
1493 | pick_v6_prefix_helper(struct reply_state *reply, int prefix_mode) { | |
1494 | struct ipv6_pool *p = NULL; | |
1495 | struct ipv6_pond *pond; | |
1496 | int i; | |
1497 | unsigned int attempts; | |
1498 | struct iasubopt **pref = &reply->lease; | |
01fa619f SR |
1499 | |
1500 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
1501 | if (((pond->prohibit_list != NULL) && | |
1502 | (permitted(reply->packet, pond->prohibit_list))) || | |
1503 | ((pond->permit_list != NULL) && | |
1504 | (!permitted(reply->packet, pond->permit_list)))) | |
9322442f | 1505 | continue; |
80c9fdb0 | 1506 | |
01fa619f | 1507 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { |
1a006ff6 TM |
1508 | if ((p->pool_type == D6O_IA_PD) && |
1509 | (eval_prefix_mode(p->units, reply->preflen, | |
1510 | prefix_mode) == 1) && | |
1511 | (create_prefix6(p, pref, &attempts, | |
1512 | &reply->ia->iaid_duid, | |
1513 | cur_time + 120) == ISC_R_SUCCESS)) { | |
01fa619f SR |
1514 | return (ISC_R_SUCCESS); |
1515 | } | |
80c9fdb0 FD |
1516 | } |
1517 | } | |
1518 | ||
80c9fdb0 FD |
1519 | return ISC_R_NORESOURCES; |
1520 | } | |
1521 | ||
1a006ff6 TM |
1522 | /*! |
1523 | * | |
1524 | * \brief Test a prefix length against another based on prefix length mode | |
1525 | * | |
1526 | * \param len - prefix length to test | |
1527 | * \param preflen - preferred prefix length against which to test | |
1528 | * \param prefix_mode - prefix selection mode with which to test | |
1529 | * | |
1530 | * Note that the case of preferred length of 0 is not short-cut here as it | |
1531 | * is assumed to be done at a higher level. | |
1532 | * | |
1533 | * \return 1 if the given length is usable based upon mode and a preferred | |
1534 | * length, 0 if not. | |
1535 | */ | |
1536 | int | |
1537 | eval_prefix_mode(int len, int preflen, int prefix_mode) { | |
1538 | int use_it = 1; | |
1539 | switch (prefix_mode) { | |
1540 | case PLM_EXACT: | |
1541 | use_it = (len == preflen); | |
1542 | break; | |
1543 | case PLM_MINIMUM: | |
1544 | /* they asked for a prefix length no "shorter" than preflen */ | |
1545 | use_it = (len >= preflen); | |
1546 | break; | |
1547 | case PLM_MAXIMUM: | |
1548 | /* they asked for a prefix length no "longer" than preflen */ | |
1549 | use_it = (len <= preflen); | |
1550 | break; | |
1551 | default: | |
1552 | /* otherwise use it */ | |
1553 | break; | |
1554 | } | |
1555 | ||
1556 | #if defined (DEBUG) | |
1557 | log_debug("eval_prefix_mode: " | |
1558 | "len %d, preflen %d, mode %s, use_it %d", | |
1559 | len, preflen, | |
1560 | prefix_length_modes.values[prefix_mode].name, use_it); | |
1561 | #endif | |
1562 | ||
1563 | return (use_it); | |
1564 | } | |
1565 | ||
5279b8f3 | 1566 | /* |
cbbd2714 SR |
1567 | *! \file server/dhcpv6.c |
1568 | * | |
1569 | * \brief construct a reply containing information about a client's lease | |
1570 | * | |
5279b8f3 DH |
1571 | * lease_to_client() is called from several messages to construct a |
1572 | * reply that contains all that we know about the client's correct lease | |
1573 | * (or projected lease). | |
1574 | * | |
20ae1aff | 1575 | * Solicit - "Soft" binding, ignore unknown addresses or bindings, just |
5279b8f3 DH |
1576 | * send what we "may" give them on a request. |
1577 | * | |
1578 | * Request - "Hard" binding, but ignore supplied addresses (just provide what | |
1579 | * the client should really use). | |
1580 | * | |
1581 | * Renew - "Hard" binding, but client-supplied addresses are 'real'. Error | |
1582 | * Rebind out any "wrong" addresses the client sends. This means we send | |
1583 | * an empty IA_NA with a status code of NoBinding or NotOnLink or | |
1584 | * possibly send the address with zeroed lifetimes. | |
1585 | * | |
4f963ddc FD |
1586 | * Information-Request - No binding. |
1587 | * | |
5279b8f3 DH |
1588 | * The basic structure is to traverse the client-supplied data first, and |
1589 | * validate and echo back any contents that can be. If the client-supplied | |
1590 | * data does not error out (on renew/rebind as above), but we did not send | |
1591 | * any addresses, attempt to allocate one. | |
cbbd2714 SR |
1592 | * |
1593 | * At the end of the this function we call commit_leases_timed() to | |
1594 | * fsync and rotate the file as necessary. commit_leases_timed() will | |
1595 | * check that we have written at least one lease to the file and that | |
1596 | * some time has passed before doing any fsync or file rewrite so we | |
1597 | * don't bother tracking if we did a write_ia during this function. | |
5279b8f3 | 1598 | */ |
98bd7ca0 | 1599 | /* TODO: look at client hints for lease times */ |
cbbd2714 | 1600 | |
98bd7ca0 DH |
1601 | static void |
1602 | lease_to_client(struct data_string *reply_ret, | |
b31fe1d5 | 1603 | struct packet *packet, |
98bd7ca0 | 1604 | const struct data_string *client_id, |
c382bc98 SK |
1605 | const struct data_string *server_id) |
1606 | { | |
5279b8f3 | 1607 | static struct reply_state reply; |
98bd7ca0 DH |
1608 | struct option_cache *oc; |
1609 | struct data_string packet_oro; | |
01fa619f | 1610 | int i; |
98bd7ca0 | 1611 | |
355db4b6 SR |
1612 | memset(&packet_oro, 0, sizeof(packet_oro)); |
1613 | ||
5279b8f3 | 1614 | /* Locate the client. */ |
bd72740e FD |
1615 | if (shared_network_from_packet6(&reply.shared, |
1616 | packet) != ISC_R_SUCCESS) | |
1617 | goto exit; | |
06eb8bab | 1618 | |
b31fe1d5 | 1619 | /* |
5279b8f3 | 1620 | * Initialize the reply. |
98bd7ca0 | 1621 | */ |
5279b8f3 DH |
1622 | packet_reference(&reply.packet, packet, MDL); |
1623 | data_string_copy(&reply.client_id, client_id, MDL); | |
1624 | ||
1625 | if (!start_reply(packet, client_id, server_id, &reply.opt_state, | |
1626 | &reply.buf.reply)) | |
98bd7ca0 | 1627 | goto exit; |
5279b8f3 DH |
1628 | |
1629 | /* Set the write cursor to just past the reply header. */ | |
1630 | reply.cursor = REPLY_OPTIONS_INDEX; | |
98bd7ca0 DH |
1631 | |
1632 | /* | |
1633 | * Get the ORO from the packet, if any. | |
1634 | */ | |
1635 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_ORO); | |
1636 | if (oc != NULL) { | |
b31fe1d5 TM |
1637 | if (!evaluate_option_cache(&packet_oro, packet, |
1638 | NULL, NULL, | |
98bd7ca0 DH |
1639 | packet->options, NULL, |
1640 | &global_scope, oc, MDL)) { | |
1641 | log_error("lease_to_client: error evaluating ORO."); | |
1642 | goto exit; | |
1643 | } | |
1644 | } | |
1645 | ||
b31fe1d5 | 1646 | /* |
62a9eb91 | 1647 | * Find a host record that matches the packet, if any, and is |
5279b8f3 | 1648 | * valid for the shared network the client is on. |
98bd7ca0 | 1649 | */ |
62a9eb91 | 1650 | if (find_hosts6(&reply.host, packet, client_id, MDL)) { |
01fa619f | 1651 | packet->known = 1; |
bd72740e | 1652 | seek_shared_host(&reply.host, reply.shared); |
01fa619f | 1653 | } |
98bd7ca0 | 1654 | |
80c9fdb0 | 1655 | /* Process the client supplied IA's onto the reply buffer. */ |
5279b8f3 DH |
1656 | reply.ia_count = 0; |
1657 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); | |
d19fa5a1 | 1658 | |
5279b8f3 | 1659 | for (; oc != NULL ; oc = oc->next) { |
9f1d5a2f DH |
1660 | isc_result_t status; |
1661 | ||
1d9774ab FD |
1662 | /* Start counting resources (addresses) offered. */ |
1663 | reply.client_resources = 0; | |
9322442f | 1664 | reply.resources_included = ISC_FALSE; |
9f1d5a2f | 1665 | |
1d9774ab | 1666 | status = reply_process_ia_na(&reply, oc); |
9f1d5a2f DH |
1667 | |
1668 | /* | |
1669 | * We continue to try other IA's whether we can address | |
1670 | * this one or not. Any other result is an immediate fail. | |
1671 | */ | |
1672 | if ((status != ISC_R_SUCCESS) && | |
1673 | (status != ISC_R_NORESOURCES)) | |
5279b8f3 | 1674 | goto exit; |
80c9fdb0 FD |
1675 | } |
1676 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); | |
1677 | for (; oc != NULL ; oc = oc->next) { | |
1678 | isc_result_t status; | |
1679 | ||
80c9fdb0 FD |
1680 | /* Start counting resources (addresses) offered. */ |
1681 | reply.client_resources = 0; | |
9322442f | 1682 | reply.resources_included = ISC_FALSE; |
80c9fdb0 FD |
1683 | |
1684 | status = reply_process_ia_ta(&reply, oc); | |
1685 | ||
1686 | /* | |
1687 | * We continue to try other IA's whether we can address | |
1688 | * this one or not. Any other result is an immediate fail. | |
1689 | */ | |
1690 | if ((status != ISC_R_SUCCESS) && | |
1691 | (status != ISC_R_NORESOURCES)) | |
1692 | goto exit; | |
5279b8f3 DH |
1693 | } |
1694 | ||
80c9fdb0 | 1695 | /* Same for IA_PD's. */ |
9322442f | 1696 | reply.pd_count = 0; |
80c9fdb0 FD |
1697 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); |
1698 | for (; oc != NULL ; oc = oc->next) { | |
1699 | isc_result_t status; | |
1700 | ||
1701 | /* Start counting resources (prefixes) offered. */ | |
1702 | reply.client_resources = 0; | |
9322442f | 1703 | reply.resources_included = ISC_FALSE; |
80c9fdb0 FD |
1704 | |
1705 | status = reply_process_ia_pd(&reply, oc); | |
1706 | ||
1707 | /* | |
1708 | * We continue to try other IA_PD's whether we can address | |
1709 | * this one or not. Any other result is an immediate fail. | |
1710 | */ | |
1711 | if ((status != ISC_R_SUCCESS) && | |
1712 | (status != ISC_R_NORESOURCES)) | |
1713 | goto exit; | |
80c9fdb0 | 1714 | } |
1d9774ab | 1715 | |
5279b8f3 | 1716 | /* |
4f963ddc FD |
1717 | * Make no reply if we gave no resources and is not |
1718 | * for Information-Request. | |
5279b8f3 | 1719 | */ |
7d6180be DH |
1720 | if ((reply.ia_count == 0) && (reply.pd_count == 0)) { |
1721 | if (reply.packet->dhcpv6_msg_type != | |
1722 | DHCPV6_INFORMATION_REQUEST) | |
1723 | goto exit; | |
1724 | ||
1725 | /* | |
1726 | * Because we only execute statements on a per-IA basis, | |
1727 | * we need to execute statements in any non-IA reply to | |
1728 | * source configuration. | |
1729 | */ | |
1730 | execute_statements_in_scope(NULL, reply.packet, NULL, NULL, | |
1731 | reply.packet->options, | |
1732 | reply.opt_state, &global_scope, | |
a7341359 SR |
1733 | reply.shared->group, root_group, |
1734 | NULL); | |
2267da84 | 1735 | |
01fa619f SR |
1736 | /* Execute statements from class scopes. */ |
1737 | for (i = reply.packet->class_count; i > 0; i--) { | |
1738 | execute_statements_in_scope(NULL, reply.packet, | |
1739 | NULL, NULL, | |
1740 | reply.packet->options, | |
1741 | reply.opt_state, | |
1742 | &global_scope, | |
1743 | reply.packet->classes[i - 1]->group, | |
1744 | reply.shared->group, NULL); | |
1745 | } | |
1746 | ||
2267da84 DH |
1747 | /* Bring in any configuration from a host record. */ |
1748 | if (reply.host != NULL) | |
a7341359 SR |
1749 | execute_statements_in_scope(NULL, reply.packet, |
1750 | NULL, NULL, | |
1751 | reply.packet->options, | |
2267da84 DH |
1752 | reply.opt_state, |
1753 | &global_scope, | |
1754 | reply.host->group, | |
a7341359 | 1755 | reply.shared->group, NULL); |
7d6180be | 1756 | } |
98bd7ca0 | 1757 | |
5279b8f3 | 1758 | /* |
9f1d5a2f DH |
1759 | * RFC3315 section 17.2.2 (Solicit): |
1760 | * | |
1761 | * If the server will not assign any addresses to any IAs in a | |
1762 | * subsequent Request from the client, the server MUST send an | |
1763 | * Advertise message to the client that includes only a Status | |
1764 | * Code option with code NoAddrsAvail and a status message for | |
1765 | * the user, a Server Identifier option with the server's DUID, | |
1766 | * and a Client Identifier option with the client's DUID. | |
1767 | * | |
388cba45 SR |
1768 | * This has been updated by an errata such that the server |
1769 | * can always send an IA. | |
1770 | * | |
9f1d5a2f DH |
1771 | * Section 18.2.1 (Request): |
1772 | * | |
1773 | * If the server cannot assign any addresses to an IA in the | |
1774 | * message from the client, the server MUST include the IA in | |
1775 | * the Reply message with no addresses in the IA and a Status | |
1776 | * Code option in the IA containing status code NoAddrsAvail. | |
1777 | * | |
892379ec | 1778 | * Section 18.1.8 (Client Behavior): |
9f1d5a2f | 1779 | * |
892379ec FD |
1780 | * Leave unchanged any information about addresses the client has |
1781 | * recorded in the IA but that were not included in the IA from | |
1782 | * the server. | |
1783 | * Sends a Renew/Rebind if the IA is not in the Reply message. | |
5279b8f3 | 1784 | */ |
9f1d5a2f | 1785 | |
d19fa5a1 SR |
1786 | /* |
1787 | * Having stored the client's IA's, store any options that | |
1788 | * will fit in the remaining space. | |
1789 | */ | |
1790 | reply.cursor += store_options6((char *)reply.buf.data + reply.cursor, | |
1791 | sizeof(reply.buf) - reply.cursor, | |
1792 | reply.opt_state, reply.packet, | |
1793 | required_opts_solicit, | |
1794 | &packet_oro); | |
5279b8f3 DH |
1795 | |
1796 | /* Return our reply to the caller. */ | |
1797 | reply_ret->len = reply.cursor; | |
1798 | reply_ret->buffer = NULL; | |
1799 | if (!buffer_allocate(&reply_ret->buffer, reply.cursor, MDL)) { | |
1800 | log_fatal("No memory to store Reply."); | |
98bd7ca0 | 1801 | } |
5279b8f3 DH |
1802 | memcpy(reply_ret->buffer->data, reply.buf.data, reply.cursor); |
1803 | reply_ret->data = reply_ret->buffer->data; | |
1804 | ||
cbbd2714 SR |
1805 | /* If appropriate commit and rotate the lease file */ |
1806 | (void) commit_leases_timed(); | |
1807 | ||
5279b8f3 DH |
1808 | exit: |
1809 | /* Cleanup. */ | |
1810 | if (reply.shared != NULL) | |
1811 | shared_network_dereference(&reply.shared, MDL); | |
1812 | if (reply.host != NULL) | |
1813 | host_dereference(&reply.host, MDL); | |
1814 | if (reply.opt_state != NULL) | |
1815 | option_state_dereference(&reply.opt_state, MDL); | |
1816 | if (reply.packet != NULL) | |
1817 | packet_dereference(&reply.packet, MDL); | |
1818 | if (reply.client_id.data != NULL) | |
1819 | data_string_forget(&reply.client_id, MDL); | |
3bedb117 SR |
1820 | if (packet_oro.buffer != NULL) |
1821 | data_string_forget(&packet_oro, MDL); | |
dce576b8 | 1822 | reply.renew = reply.rebind = reply.min_prefer = reply.min_valid = 0; |
5279b8f3 DH |
1823 | reply.cursor = 0; |
1824 | } | |
98bd7ca0 | 1825 | |
b9137d42 | 1826 | /* Process a client-supplied IA_NA. This may append options to the tail of |
5279b8f3 DH |
1827 | * the reply packet being built in the reply_state structure. |
1828 | */ | |
1829 | static isc_result_t | |
1d9774ab | 1830 | reply_process_ia_na(struct reply_state *reply, struct option_cache *ia) { |
5279b8f3 DH |
1831 | isc_result_t status = ISC_R_SUCCESS; |
1832 | u_int32_t iaid; | |
1833 | unsigned ia_cursor; | |
1834 | struct option_state *packet_ia; | |
1835 | struct option_cache *oc; | |
1836 | struct data_string ia_data, data; | |
98bd7ca0 | 1837 | |
5279b8f3 DH |
1838 | /* Initialize values that will get cleaned up on return. */ |
1839 | packet_ia = NULL; | |
1840 | memset(&ia_data, 0, sizeof(ia_data)); | |
1841 | memset(&data, 0, sizeof(data)); | |
b31fe1d5 TM |
1842 | /* |
1843 | * Note that find_client_address() may set reply->lease. | |
b9137d42 | 1844 | */ |
98bd7ca0 | 1845 | |
5279b8f3 DH |
1846 | /* Make sure there is at least room for the header. */ |
1847 | if ((reply->cursor + IA_NA_OFFSET + 4) > sizeof(reply->buf)) { | |
1d9774ab | 1848 | log_error("reply_process_ia_na: Reply too long for IA."); |
5279b8f3 | 1849 | return ISC_R_NOSPACE; |
98bd7ca0 | 1850 | } |
98bd7ca0 | 1851 | |
98bd7ca0 | 1852 | |
5279b8f3 DH |
1853 | /* Fetch the IA_NA contents. */ |
1854 | if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, | |
1855 | ia, IA_NA_OFFSET)) { | |
9322442f | 1856 | log_error("reply_process_ia_na: error evaluating ia"); |
5279b8f3 DH |
1857 | status = ISC_R_FAILURE; |
1858 | goto cleanup; | |
1859 | } | |
98bd7ca0 | 1860 | |
5279b8f3 DH |
1861 | /* Extract IA_NA header contents. */ |
1862 | iaid = getULong(ia_data.data); | |
1863 | reply->renew = getULong(ia_data.data + 4); | |
1864 | reply->rebind = getULong(ia_data.data + 8); | |
1865 | ||
1866 | /* Create an IA_NA structure. */ | |
b31fe1d5 | 1867 | if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, |
9322442f FD |
1868 | reply->client_id.len, MDL) != ISC_R_SUCCESS) { |
1869 | log_error("reply_process_ia_na: no memory for ia."); | |
5279b8f3 DH |
1870 | status = ISC_R_NOMEMORY; |
1871 | goto cleanup; | |
1872 | } | |
9322442f | 1873 | reply->ia->ia_type = D6O_IA_NA; |
5279b8f3 DH |
1874 | |
1875 | /* Cache pre-existing IA, if any. */ | |
9322442f FD |
1876 | ia_hash_lookup(&reply->old_ia, ia_na_active, |
1877 | (unsigned char *)reply->ia->iaid_duid.data, | |
1878 | reply->ia->iaid_duid.len, MDL); | |
5279b8f3 DH |
1879 | |
1880 | /* | |
1881 | * Create an option cache to carry the IA_NA option contents, and | |
1882 | * execute any user-supplied values into it. | |
1883 | */ | |
1884 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
1885 | status = ISC_R_NOMEMORY; | |
1886 | goto cleanup; | |
1887 | } | |
1888 | ||
1889 | /* Check & cache the fixed host record. */ | |
1890 | if ((reply->host != NULL) && (reply->host->fixed_addr != NULL)) { | |
2267da84 DH |
1891 | struct iaddr tmp_addr; |
1892 | ||
5279b8f3 DH |
1893 | if (!evaluate_option_cache(&reply->fixed, NULL, NULL, NULL, |
1894 | NULL, NULL, &global_scope, | |
1895 | reply->host->fixed_addr, MDL)) { | |
1d9774ab | 1896 | log_error("reply_process_ia_na: unable to evaluate " |
5279b8f3 DH |
1897 | "fixed address."); |
1898 | status = ISC_R_FAILURE; | |
1899 | goto cleanup; | |
98bd7ca0 DH |
1900 | } |
1901 | ||
5279b8f3 | 1902 | if (reply->fixed.len < 16) { |
1d9774ab | 1903 | log_error("reply_process_ia_na: invalid fixed address."); |
98bf1607 | 1904 | status = DHCP_R_INVALIDARG; |
5279b8f3 | 1905 | goto cleanup; |
98bd7ca0 DH |
1906 | } |
1907 | ||
2267da84 DH |
1908 | /* Find the static lease's subnet. */ |
1909 | tmp_addr.len = 16; | |
1910 | memcpy(tmp_addr.iabuf, reply->fixed.data, 16); | |
1911 | ||
1912 | if (find_grouped_subnet(&reply->subnet, reply->shared, | |
1913 | tmp_addr, MDL) == 0) | |
1914 | log_fatal("Impossible condition at %s:%d.", MDL); | |
1915 | ||
5279b8f3 DH |
1916 | reply->static_lease = ISC_TRUE; |
1917 | } else | |
1918 | reply->static_lease = ISC_FALSE; | |
1919 | ||
1920 | /* | |
1921 | * Save the cursor position at the start of the IA, so we can | |
1922 | * set length and adjust t1/t2 values later. We write a temporary | |
1923 | * header out now just in case we decide to adjust the packet | |
1924 | * within sub-process functions. | |
1925 | */ | |
1926 | ia_cursor = reply->cursor; | |
1927 | ||
1928 | /* Initialize the IA_NA header. First the code. */ | |
1929 | putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_NA); | |
1930 | reply->cursor += 2; | |
1931 | ||
1932 | /* Then option length. */ | |
1933 | putUShort(reply->buf.data + reply->cursor, 0x0Cu); | |
1934 | reply->cursor += 2; | |
1935 | ||
1936 | /* Then IA_NA header contents; IAID. */ | |
1937 | putULong(reply->buf.data + reply->cursor, iaid); | |
1938 | reply->cursor += 4; | |
1939 | ||
1940 | /* We store the client's t1 for now, and may over-ride it later. */ | |
1941 | putULong(reply->buf.data + reply->cursor, reply->renew); | |
1942 | reply->cursor += 4; | |
1943 | ||
1944 | /* We store the client's t2 for now, and may over-ride it later. */ | |
1945 | putULong(reply->buf.data + reply->cursor, reply->rebind); | |
1946 | reply->cursor += 4; | |
1947 | ||
b31fe1d5 | 1948 | /* |
892379ec FD |
1949 | * For each address in this IA_NA, decide what to do about it. |
1950 | * | |
1951 | * Guidelines: | |
1952 | * | |
7c7515b9 | 1953 | * The client leaves unchanged any information about addresses |
892379ec FD |
1954 | * it has recorded but are not included ("cancel/break" below). |
1955 | * A not included IA ("cleanup" below) could give a Renew/Rebind. | |
5279b8f3 DH |
1956 | */ |
1957 | oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAADDR); | |
dce576b8 | 1958 | reply->min_valid = reply->min_prefer = 0xffffffff; |
5279b8f3 | 1959 | reply->client_valid = reply->client_prefer = 0; |
5279b8f3 DH |
1960 | for (; oc != NULL ; oc = oc->next) { |
1961 | status = reply_process_addr(reply, oc); | |
1962 | ||
98bd7ca0 | 1963 | /* |
5279b8f3 DH |
1964 | * Canceled means we did not allocate addresses to the |
1965 | * client, but we're "done" with this IA - we set a status | |
1966 | * code. So transmit this reply, e.g., move on to the next | |
1967 | * IA. | |
98bd7ca0 | 1968 | */ |
5279b8f3 DH |
1969 | if (status == ISC_R_CANCELED) |
1970 | break; | |
98bd7ca0 | 1971 | |
1aa0fe5e DH |
1972 | if ((status != ISC_R_SUCCESS) && |
1973 | (status != ISC_R_ADDRINUSE) && | |
1974 | (status != ISC_R_ADDRNOTAVAIL)) | |
5279b8f3 DH |
1975 | goto cleanup; |
1976 | } | |
1977 | ||
1978 | reply->ia_count++; | |
1979 | ||
1980 | /* | |
1981 | * If we fell through the above and never gave the client | |
1982 | * an address, give it one now. | |
1983 | */ | |
1d9774ab | 1984 | if ((status != ISC_R_CANCELED) && (reply->client_resources == 0)) { |
5279b8f3 DH |
1985 | status = find_client_address(reply); |
1986 | ||
9f1d5a2f DH |
1987 | if (status == ISC_R_NORESOURCES) { |
1988 | switch (reply->packet->dhcpv6_msg_type) { | |
1989 | case DHCPV6_SOLICIT: | |
1990 | /* | |
80c9fdb0 | 1991 | * No address for any IA is handled |
892379ec | 1992 | * by the caller. |
9f1d5a2f | 1993 | */ |
80c9fdb0 | 1994 | /* FALL THROUGH */ |
9f1d5a2f DH |
1995 | |
1996 | case DHCPV6_REQUEST: | |
1997 | /* Section 18.2.1 (Request): | |
1998 | * | |
1999 | * If the server cannot assign any addresses to | |
2000 | * an IA in the message from the client, the | |
2001 | * server MUST include the IA in the Reply | |
2002 | * message with no addresses in the IA and a | |
2003 | * Status Code option in the IA containing | |
2004 | * status code NoAddrsAvail. | |
2005 | */ | |
5279b8f3 DH |
2006 | option_state_dereference(&reply->reply_ia, MDL); |
2007 | if (!option_state_allocate(&reply->reply_ia, | |
9f1d5a2f DH |
2008 | MDL)) |
2009 | { | |
1d9774ab | 2010 | log_error("reply_process_ia_na: No " |
9f1d5a2f DH |
2011 | "memory for option state " |
2012 | "wipe."); | |
5279b8f3 DH |
2013 | status = ISC_R_NOMEMORY; |
2014 | goto cleanup; | |
2015 | } | |
5279b8f3 | 2016 | |
9f1d5a2f DH |
2017 | if (!set_status_code(STATUS_NoAddrsAvail, |
2018 | "No addresses available " | |
2019 | "for this interface.", | |
2020 | reply->reply_ia)) { | |
1d9774ab | 2021 | log_error("reply_process_ia_na: Unable " |
9f1d5a2f DH |
2022 | "to set NoAddrsAvail status " |
2023 | "code."); | |
2024 | status = ISC_R_FAILURE; | |
2025 | goto cleanup; | |
2026 | } | |
5279b8f3 | 2027 | |
9f1d5a2f DH |
2028 | status = ISC_R_SUCCESS; |
2029 | break; | |
2030 | ||
2031 | default: | |
2032 | /* | |
2033 | * RFC 3315 does not tell us to emit a status | |
2034 | * code in this condition, or anything else. | |
2035 | * | |
2036 | * If we included non-allocated addresses | |
2037 | * (zeroed lifetimes) in an IA, then the client | |
2038 | * will deconfigure them. | |
2039 | * | |
2040 | * So we want to include the IA even if we | |
2041 | * can't give it a new address if it includes | |
2042 | * zeroed lifetime addresses. | |
2043 | * | |
2044 | * We don't want to include the IA if we | |
2045 | * provide zero addresses including zeroed | |
892379ec | 2046 | * lifetimes. |
9f1d5a2f | 2047 | */ |
9322442f | 2048 | if (reply->resources_included) |
9f1d5a2f DH |
2049 | status = ISC_R_SUCCESS; |
2050 | else | |
2051 | goto cleanup; | |
2052 | break; | |
2053 | } | |
98bd7ca0 DH |
2054 | } |
2055 | ||
5279b8f3 DH |
2056 | if (status != ISC_R_SUCCESS) |
2057 | goto cleanup; | |
2058 | } | |
2059 | ||
2060 | reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, | |
2061 | sizeof(reply->buf) - reply->cursor, | |
2062 | reply->reply_ia, reply->packet, | |
80c9fdb0 | 2063 | required_opts_IA, NULL); |
5279b8f3 DH |
2064 | |
2065 | /* Reset the length of this IA to match what was just written. */ | |
2066 | putUShort(reply->buf.data + ia_cursor + 2, | |
2067 | reply->cursor - (ia_cursor + 4)); | |
2068 | ||
dce576b8 TM |
2069 | /* Calculate T1/T2 and stuff them in the reply */ |
2070 | set_reply_tee_times(reply, ia_cursor); | |
98bd7ca0 | 2071 | |
d9b5c150 SR |
2072 | /* |
2073 | * yes, goto's aren't the best but we also want to avoid extra | |
2074 | * indents | |
2075 | */ | |
2076 | if (status == ISC_R_CANCELED) | |
2077 | goto cleanup; | |
2078 | ||
2079 | /* | |
2080 | * Handle static leases, we always log stuff and if it's | |
2081 | * a hard binding we run any commit statements that we have | |
2082 | */ | |
2083 | if (reply->static_lease) { | |
2084 | char tmp_addr[INET6_ADDRSTRLEN]; | |
2085 | log_info("%s NA: address %s to client with duid %s iaid = %d " | |
2086 | "static", | |
2087 | dhcpv6_type_names[reply->buf.reply.msg_type], | |
2088 | inet_ntop(AF_INET6, reply->fixed.data, tmp_addr, | |
2089 | sizeof(tmp_addr)), | |
2090 | print_hex_1(reply->client_id.len, | |
2091 | reply->client_id.data, 60), | |
2092 | iaid); | |
2093 | ||
2094 | if ((reply->buf.reply.msg_type == DHCPV6_REPLY) && | |
2095 | (reply->on_star.on_commit != NULL)) { | |
b31fe1d5 | 2096 | execute_statements(NULL, reply->packet, NULL, NULL, |
d9b5c150 SR |
2097 | reply->packet->options, |
2098 | reply->opt_state, NULL, | |
2099 | reply->on_star.on_commit, NULL); | |
2100 | executable_statement_dereference | |
2101 | (&reply->on_star.on_commit, MDL); | |
2102 | } | |
2103 | goto cleanup; | |
2104 | } | |
2105 | ||
2106 | /* | |
2107 | * If we have any addresses log what we are doing. | |
2108 | */ | |
2109 | if (reply->ia->num_iasubopt != 0) { | |
2110 | struct iasubopt *tmp; | |
2111 | int i; | |
2112 | char tmp_addr[INET6_ADDRSTRLEN]; | |
2113 | ||
2114 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { | |
2115 | tmp = reply->ia->iasubopt[i]; | |
2116 | ||
2117 | log_info("%s NA: address %s to client with duid %s " | |
36c4a037 | 2118 | "iaid = %d valid for %u seconds", |
d9b5c150 SR |
2119 | dhcpv6_type_names[reply->buf.reply.msg_type], |
2120 | inet_ntop(AF_INET6, &tmp->addr, | |
2121 | tmp_addr, sizeof(tmp_addr)), | |
2122 | print_hex_1(reply->client_id.len, | |
2123 | reply->client_id.data, 60), | |
2124 | iaid, tmp->valid); | |
2125 | } | |
2126 | } | |
2127 | ||
5279b8f3 DH |
2128 | /* |
2129 | * If this is not a 'soft' binding, consume the new changes into | |
2130 | * the database (if any have been attached to the ia_na). | |
2131 | * | |
2132 | * Loop through the assigned dynamic addresses, referencing the | |
2133 | * leases onto this IA_NA rather than any old ones, and updating | |
2134 | * pool timers for each (if any). | |
2135 | */ | |
d9b5c150 SR |
2136 | |
2137 | if ((reply->ia->num_iasubopt != 0) && | |
2138 | (reply->buf.reply.msg_type == DHCPV6_REPLY)) { | |
1d17db44 | 2139 | struct iasubopt *tmp; |
5279b8f3 DH |
2140 | struct data_string *ia_id; |
2141 | int i; | |
98bd7ca0 | 2142 | |
1d17db44 FD |
2143 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { |
2144 | tmp = reply->ia->iasubopt[i]; | |
98bd7ca0 | 2145 | |
9322442f FD |
2146 | if (tmp->ia != NULL) |
2147 | ia_dereference(&tmp->ia, MDL); | |
2148 | ia_reference(&tmp->ia, reply->ia, MDL); | |
98bd7ca0 | 2149 | |
5d89d60f | 2150 | /* Commit 'hard' bindings. */ |
5d89d60f | 2151 | renew_lease6(tmp->ipv6_pool, tmp); |
5279b8f3 | 2152 | schedule_lease_timeout(tmp->ipv6_pool); |
98bd7ca0 | 2153 | |
a7341359 SR |
2154 | /* If we have anything to do on commit do it now */ |
2155 | if (tmp->on_star.on_commit != NULL) { | |
2156 | execute_statements(NULL, reply->packet, | |
b31fe1d5 | 2157 | NULL, NULL, |
a7341359 SR |
2158 | reply->packet->options, |
2159 | reply->opt_state, | |
58cb5d86 | 2160 | &tmp->scope, |
a7341359 SR |
2161 | tmp->on_star.on_commit, |
2162 | &tmp->on_star); | |
2163 | executable_statement_dereference | |
2164 | (&tmp->on_star.on_commit, MDL); | |
2165 | } | |
2166 | ||
98bf1607 | 2167 | #if defined (NSUPDATE) |
98bd7ca0 | 2168 | /* |
5d89d60f | 2169 | * Perform ddns updates. |
98bd7ca0 | 2170 | */ |
5279b8f3 DH |
2171 | oc = lookup_option(&server_universe, reply->opt_state, |
2172 | SV_DDNS_UPDATES); | |
2173 | if ((oc == NULL) || | |
2174 | evaluate_boolean_option_cache(NULL, reply->packet, | |
2175 | NULL, NULL, | |
2176 | reply->packet->options, | |
2177 | reply->opt_state, | |
bead14ea | 2178 | &tmp->scope, |
5279b8f3 DH |
2179 | oc, MDL)) { |
2180 | ddns_updates(reply->packet, NULL, NULL, | |
bead14ea | 2181 | tmp, NULL, reply->opt_state); |
98bd7ca0 | 2182 | } |
98bf1607 | 2183 | #endif |
250f7134 SR |
2184 | /* Do our threshold check. */ |
2185 | check_pool6_threshold(reply, tmp); | |
5279b8f3 | 2186 | } |
98bd7ca0 | 2187 | |
9322442f | 2188 | /* Remove any old ia from the hash. */ |
80c9fdb0 FD |
2189 | if (reply->old_ia != NULL) { |
2190 | ia_id = &reply->old_ia->iaid_duid; | |
9322442f FD |
2191 | ia_hash_delete(ia_na_active, |
2192 | (unsigned char *)ia_id->data, | |
2193 | ia_id->len, MDL); | |
2194 | ia_dereference(&reply->old_ia, MDL); | |
98bd7ca0 DH |
2195 | } |
2196 | ||
9322442f | 2197 | /* Put new ia into the hash. */ |
1acab09f | 2198 | reply->ia->cltt = cur_time; |
9322442f FD |
2199 | ia_id = &reply->ia->iaid_duid; |
2200 | ia_hash_add(ia_na_active, (unsigned char *)ia_id->data, | |
2201 | ia_id->len, reply->ia, MDL); | |
98bd7ca0 | 2202 | |
9322442f | 2203 | write_ia(reply->ia); |
ad80055f SR |
2204 | } else { |
2205 | schedule_lease_timeout_reply(reply); | |
5279b8f3 | 2206 | } |
98bd7ca0 | 2207 | |
5279b8f3 DH |
2208 | cleanup: |
2209 | if (packet_ia != NULL) | |
2210 | option_state_dereference(&packet_ia, MDL); | |
2211 | if (reply->reply_ia != NULL) | |
2212 | option_state_dereference(&reply->reply_ia, MDL); | |
2213 | if (ia_data.data != NULL) | |
2214 | data_string_forget(&ia_data, MDL); | |
2215 | if (data.data != NULL) | |
2216 | data_string_forget(&data, MDL); | |
9322442f FD |
2217 | if (reply->ia != NULL) |
2218 | ia_dereference(&reply->ia, MDL); | |
80c9fdb0 | 2219 | if (reply->old_ia != NULL) |
9322442f | 2220 | ia_dereference(&reply->old_ia, MDL); |
5d89d60f | 2221 | if (reply->lease != NULL) |
1d17db44 | 2222 | iasubopt_dereference(&reply->lease, MDL); |
5279b8f3 DH |
2223 | if (reply->fixed.data != NULL) |
2224 | data_string_forget(&reply->fixed, MDL); | |
2267da84 DH |
2225 | if (reply->subnet != NULL) |
2226 | subnet_dereference(&reply->subnet, MDL); | |
a7341359 SR |
2227 | if (reply->on_star.on_expiry != NULL) |
2228 | executable_statement_dereference | |
2229 | (&reply->on_star.on_expiry, MDL); | |
2230 | if (reply->on_star.on_release != NULL) | |
2231 | executable_statement_dereference | |
2232 | (&reply->on_star.on_release, MDL); | |
5279b8f3 DH |
2233 | |
2234 | /* | |
2235 | * ISC_R_CANCELED is a status code used by the addr processing to | |
2236 | * indicate we're replying with a status code. This is still a | |
2237 | * success at higher layers. | |
2238 | */ | |
2239 | return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); | |
2240 | } | |
2241 | ||
2242 | /* | |
9322442f | 2243 | * Process an IAADDR within a given IA_xA, storing any IAADDR reply contents |
5279b8f3 DH |
2244 | * into the reply's current ia-scoped option cache. Returns ISC_R_CANCELED |
2245 | * in the event we are replying with a status code and do not wish to process | |
2246 | * more IAADDRs within this IA. | |
2247 | */ | |
2248 | static isc_result_t | |
2249 | reply_process_addr(struct reply_state *reply, struct option_cache *addr) { | |
2250 | u_int32_t pref_life, valid_life; | |
2251 | struct binding_scope **scope; | |
2252 | struct group *group; | |
2253 | struct subnet *subnet; | |
2254 | struct iaddr tmp_addr; | |
b024480e | 2255 | struct option_cache *oc; |
5279b8f3 DH |
2256 | struct data_string iaaddr, data; |
2257 | isc_result_t status = ISC_R_SUCCESS; | |
2258 | ||
2259 | /* Initializes values that will be cleaned up. */ | |
2260 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
2261 | memset(&data, 0, sizeof(data)); | |
2262 | /* Note that reply->lease may be set by address_is_owned() */ | |
2263 | ||
2264 | /* | |
2265 | * There is no point trying to process an incoming address if there | |
2266 | * is no room for an outgoing address. | |
2267 | */ | |
2268 | if ((reply->cursor + 28) > sizeof(reply->buf)) { | |
2269 | log_error("reply_process_addr: Out of room for address."); | |
2270 | return ISC_R_NOSPACE; | |
2271 | } | |
2272 | ||
2273 | /* Extract this IAADDR option. */ | |
b31fe1d5 | 2274 | if (!evaluate_option_cache(&iaaddr, reply->packet, NULL, NULL, |
5279b8f3 DH |
2275 | reply->packet->options, NULL, &global_scope, |
2276 | addr, MDL) || | |
2277 | (iaaddr.len < IAADDR_OFFSET)) { | |
2278 | log_error("reply_process_addr: error evaluating IAADDR."); | |
2279 | status = ISC_R_FAILURE; | |
2280 | goto cleanup; | |
2281 | } | |
2282 | ||
bead14ea | 2283 | /* The first 16 bytes are the IPv6 address. */ |
5279b8f3 DH |
2284 | pref_life = getULong(iaaddr.data + 16); |
2285 | valid_life = getULong(iaaddr.data + 20); | |
2286 | ||
2287 | if ((reply->client_valid == 0) || | |
2288 | (reply->client_valid > valid_life)) | |
2289 | reply->client_valid = valid_life; | |
2290 | ||
2291 | if ((reply->client_prefer == 0) || | |
2292 | (reply->client_prefer > pref_life)) | |
2293 | reply->client_prefer = pref_life; | |
2294 | ||
b31fe1d5 | 2295 | /* |
5279b8f3 DH |
2296 | * Clients may choose to send :: as an address, with the idea to give |
2297 | * hints about preferred-lifetime or valid-lifetime. | |
2298 | */ | |
bead14ea DH |
2299 | tmp_addr.len = 16; |
2300 | memset(tmp_addr.iabuf, 0, 16); | |
5279b8f3 DH |
2301 | if (!memcmp(iaaddr.data, tmp_addr.iabuf, 16)) { |
2302 | /* Status remains success; we just ignore this one. */ | |
2303 | goto cleanup; | |
2304 | } | |
2305 | ||
bead14ea DH |
2306 | /* tmp_addr len remains 16 */ |
2307 | memcpy(tmp_addr.iabuf, iaaddr.data, 16); | |
2308 | ||
5279b8f3 DH |
2309 | /* |
2310 | * Verify that this address is on the client's network. | |
2311 | */ | |
2312 | for (subnet = reply->shared->subnets ; subnet != NULL ; | |
2313 | subnet = subnet->next_sibling) { | |
2314 | if (addr_eq(subnet_number(tmp_addr, subnet->netmask), | |
2315 | subnet->net)) | |
2316 | break; | |
2317 | } | |
98bd7ca0 | 2318 | |
5279b8f3 DH |
2319 | /* Address not found on shared network. */ |
2320 | if (subnet == NULL) { | |
2321 | /* Ignore this address on 'soft' bindings. */ | |
9322442f FD |
2322 | if (reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) { |
2323 | /* disable rapid commit */ | |
2324 | reply->buf.reply.msg_type = DHCPV6_ADVERTISE; | |
2325 | delete_option(&dhcpv6_universe, | |
2326 | reply->opt_state, | |
2327 | D6O_RAPID_COMMIT); | |
5279b8f3 DH |
2328 | /* status remains success */ |
2329 | goto cleanup; | |
9322442f | 2330 | } |
98bd7ca0 | 2331 | |
5279b8f3 DH |
2332 | /* |
2333 | * RFC3315 section 18.2.1: | |
2334 | * | |
2335 | * If the server finds that the prefix on one or more IP | |
2336 | * addresses in any IA in the message from the client is not | |
2337 | * appropriate for the link to which the client is connected, | |
2338 | * the server MUST return the IA to the client with a Status | |
2339 | * Code option with the value NotOnLink. | |
2340 | */ | |
2341 | if (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) { | |
2342 | /* Rewind the IA_NA to empty. */ | |
2343 | option_state_dereference(&reply->reply_ia, MDL); | |
2344 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
2345 | log_error("reply_process_addr: No memory for " | |
2346 | "option state wipe."); | |
2347 | status = ISC_R_NOMEMORY; | |
2348 | goto cleanup; | |
2349 | } | |
98bd7ca0 | 2350 | |
5279b8f3 DH |
2351 | /* Append a NotOnLink status code. */ |
2352 | if (!set_status_code(STATUS_NotOnLink, | |
2353 | "Address not for use on this " | |
2354 | "link.", reply->reply_ia)) { | |
2355 | log_error("reply_process_addr: Failure " | |
2356 | "setting status code."); | |
2357 | status = ISC_R_FAILURE; | |
2358 | goto cleanup; | |
98bd7ca0 | 2359 | } |
5279b8f3 DH |
2360 | |
2361 | /* Fin (no more IAADDRs). */ | |
2362 | status = ISC_R_CANCELED; | |
2363 | goto cleanup; | |
98bd7ca0 DH |
2364 | } |
2365 | ||
2366 | /* | |
5279b8f3 DH |
2367 | * RFC3315 sections 18.2.3 and 18.2.4 have identical language: |
2368 | * | |
2369 | * If the server finds that any of the addresses are not | |
2370 | * appropriate for the link to which the client is attached, | |
2371 | * the server returns the address to the client with lifetimes | |
2372 | * of 0. | |
98bd7ca0 | 2373 | */ |
5279b8f3 DH |
2374 | if ((reply->packet->dhcpv6_msg_type != DHCPV6_RENEW) && |
2375 | (reply->packet->dhcpv6_msg_type != DHCPV6_REBIND)) { | |
2376 | log_error("It is impossible to lease a client that is " | |
f415516e | 2377 | "not sending a solicit, request, renew, or " |
5279b8f3 DH |
2378 | "rebind."); |
2379 | status = ISC_R_FAILURE; | |
2380 | goto cleanup; | |
98bd7ca0 DH |
2381 | } |
2382 | ||
5279b8f3 DH |
2383 | reply->send_prefer = reply->send_valid = 0; |
2384 | goto send_addr; | |
2385 | } | |
2386 | ||
2387 | /* Verify the address belongs to the client. */ | |
2388 | if (!address_is_owned(reply, &tmp_addr)) { | |
98bd7ca0 | 2389 | /* |
5279b8f3 DH |
2390 | * For solicit and request, any addresses included are |
2391 | * 'requested' addresses. For rebind, we actually have | |
2392 | * no direction on what to do from 3315 section 18.2.4! | |
2393 | * So I think the best bet is to try and give it out, and if | |
2394 | * we can't, zero lifetimes. | |
98bd7ca0 | 2395 | */ |
5279b8f3 DH |
2396 | if ((reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) || |
2397 | (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) || | |
2398 | (reply->packet->dhcpv6_msg_type == DHCPV6_REBIND)) { | |
2399 | status = reply_process_try_addr(reply, &tmp_addr); | |
2400 | ||
1aa0fe5e DH |
2401 | /* |
2402 | * If the address is in use, or isn't in any dynamic | |
2403 | * range, continue as normal. If any other error was | |
2404 | * found, error out. | |
2405 | */ | |
b31fe1d5 | 2406 | if ((status != ISC_R_SUCCESS) && |
1aa0fe5e DH |
2407 | (status != ISC_R_ADDRINUSE) && |
2408 | (status != ISC_R_ADDRNOTAVAIL)) | |
5279b8f3 DH |
2409 | goto cleanup; |
2410 | ||
1aa0fe5e DH |
2411 | /* |
2412 | * If we didn't honor this lease, for solicit and | |
2413 | * request we simply omit it from our answer. For | |
2414 | * rebind, we send it with zeroed lifetimes. | |
2415 | */ | |
5279b8f3 DH |
2416 | if (reply->lease == NULL) { |
2417 | if (reply->packet->dhcpv6_msg_type == | |
2418 | DHCPV6_REBIND) { | |
2419 | reply->send_prefer = 0; | |
2420 | reply->send_valid = 0; | |
2421 | goto send_addr; | |
2422 | } | |
2423 | ||
2424 | /* status remains success - ignore */ | |
2425 | goto cleanup; | |
98bd7ca0 | 2426 | } |
5279b8f3 DH |
2427 | /* |
2428 | * RFC3315 section 18.2.3: | |
2429 | * | |
2430 | * If the server cannot find a client entry for the IA the | |
2431 | * server returns the IA containing no addresses with a Status | |
2432 | * Code option set to NoBinding in the Reply message. | |
892379ec FD |
2433 | * |
2434 | * On mismatch we (ab)use this pretending we have not the IA | |
2435 | * as soon as we have not an address. | |
5279b8f3 DH |
2436 | */ |
2437 | } else if (reply->packet->dhcpv6_msg_type == DHCPV6_RENEW) { | |
2438 | /* Rewind the IA_NA to empty. */ | |
2439 | option_state_dereference(&reply->reply_ia, MDL); | |
2440 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
2441 | log_error("reply_process_addr: No memory for " | |
2442 | "option state wipe."); | |
2443 | status = ISC_R_NOMEMORY; | |
2444 | goto cleanup; | |
98bd7ca0 | 2445 | } |
98bd7ca0 | 2446 | |
5279b8f3 DH |
2447 | /* Append a NoBinding status code. */ |
2448 | if (!set_status_code(STATUS_NoBinding, | |
2449 | "Address not bound to this " | |
2450 | "interface.", reply->reply_ia)) { | |
2451 | log_error("reply_process_addr: Unable to " | |
2452 | "attach status code."); | |
2453 | status = ISC_R_FAILURE; | |
2454 | goto cleanup; | |
98bd7ca0 | 2455 | } |
5279b8f3 DH |
2456 | |
2457 | /* Fin (no more IAADDRs). */ | |
2458 | status = ISC_R_CANCELED; | |
2459 | goto cleanup; | |
2460 | } else { | |
2461 | log_error("It is impossible to lease a client that is " | |
2462 | "not sending a solicit, request, renew, or " | |
2463 | "rebind message."); | |
2464 | status = ISC_R_FAILURE; | |
2465 | goto cleanup; | |
98bd7ca0 | 2466 | } |
5279b8f3 | 2467 | } |
98bd7ca0 | 2468 | |
5279b8f3 DH |
2469 | if (reply->static_lease) { |
2470 | if (reply->host == NULL) | |
2471 | log_fatal("Impossible condition at %s:%d.", MDL); | |
d9b43370 | 2472 | |
5279b8f3 | 2473 | scope = &global_scope; |
2267da84 | 2474 | group = reply->subnet->group; |
5279b8f3 DH |
2475 | } else { |
2476 | if (reply->lease == NULL) | |
2477 | log_fatal("Impossible condition at %s:%d.", MDL); | |
7285af30 | 2478 | |
5279b8f3 | 2479 | scope = &reply->lease->scope; |
01fa619f | 2480 | group = reply->lease->ipv6_pool->ipv6_pond->group; |
5279b8f3 | 2481 | } |
98bd7ca0 | 2482 | |
b024480e | 2483 | /* |
1d9774ab | 2484 | * If client_resources is nonzero, then the reply_process_is_addressed |
b024480e DH |
2485 | * function has executed configuration state into the reply option |
2486 | * cache. We will use that valid cache to derive configuration for | |
2487 | * whether or not to engage in additional addresses, and similar. | |
2488 | */ | |
1d9774ab | 2489 | if (reply->client_resources != 0) { |
b024480e DH |
2490 | unsigned limit = 1; |
2491 | ||
2492 | /* | |
2493 | * Does this client have "enough" addresses already? Default | |
2494 | * to one. Everybody gets one, and one should be enough for | |
2495 | * anybody. | |
2496 | */ | |
2497 | oc = lookup_option(&server_universe, reply->opt_state, | |
2498 | SV_LIMIT_ADDRS_PER_IA); | |
2499 | if (oc != NULL) { | |
2500 | if (!evaluate_option_cache(&data, reply->packet, | |
2501 | NULL, NULL, | |
2502 | reply->packet->options, | |
2503 | reply->opt_state, | |
2504 | scope, oc, MDL) || | |
2505 | (data.len != 4)) { | |
1d9774ab | 2506 | log_error("reply_process_addr: unable to " |
b024480e DH |
2507 | "evaluate addrs-per-ia value."); |
2508 | status = ISC_R_FAILURE; | |
2509 | goto cleanup; | |
2510 | } | |
2511 | ||
2512 | limit = getULong(data.data); | |
2513 | data_string_forget(&data, MDL); | |
2514 | } | |
2515 | ||
2516 | /* | |
2517 | * If we wish to limit the client to a certain number of | |
2518 | * addresses, then omit the address from the reply. | |
2519 | */ | |
1d9774ab | 2520 | if (reply->client_resources >= limit) |
b024480e DH |
2521 | goto cleanup; |
2522 | } | |
2523 | ||
9322442f | 2524 | status = reply_process_is_addressed(reply, scope, group); |
5279b8f3 DH |
2525 | if (status != ISC_R_SUCCESS) |
2526 | goto cleanup; | |
98bd7ca0 | 2527 | |
5279b8f3 DH |
2528 | send_addr: |
2529 | status = reply_process_send_addr(reply, &tmp_addr); | |
98bd7ca0 | 2530 | |
5279b8f3 DH |
2531 | cleanup: |
2532 | if (iaaddr.data != NULL) | |
2533 | data_string_forget(&iaaddr, MDL); | |
2534 | if (data.data != NULL) | |
2535 | data_string_forget(&data, MDL); | |
2536 | if (reply->lease != NULL) | |
1d17db44 | 2537 | iasubopt_dereference(&reply->lease, MDL); |
98bd7ca0 | 2538 | |
5279b8f3 DH |
2539 | return status; |
2540 | } | |
98bd7ca0 | 2541 | |
5279b8f3 DH |
2542 | /* |
2543 | * Verify the address belongs to the client. If we've got a host | |
2544 | * record with a fixed address, it has to be the assigned address | |
2545 | * (fault out all else). Otherwise it's a dynamic address, so lookup | |
2546 | * that address and make sure it belongs to this DUID:IAID pair. | |
2547 | */ | |
2548 | static isc_boolean_t | |
2549 | address_is_owned(struct reply_state *reply, struct iaddr *addr) { | |
2550 | int i; | |
01fa619f | 2551 | struct ipv6_pond *pond; |
98bd7ca0 | 2552 | |
5279b8f3 DH |
2553 | /* |
2554 | * This faults out addresses that don't match fixed addresses. | |
2555 | */ | |
2556 | if (reply->static_lease) { | |
2557 | if (reply->fixed.data == NULL) | |
2558 | log_fatal("Impossible condition at %s:%d.", MDL); | |
98bd7ca0 | 2559 | |
5279b8f3 | 2560 | if (memcmp(addr->iabuf, reply->fixed.data, 16) == 0) |
bc7f8b8e | 2561 | return (ISC_TRUE); |
98bd7ca0 | 2562 | |
bc7f8b8e | 2563 | return (ISC_FALSE); |
5279b8f3 DH |
2564 | } |
2565 | ||
1d17db44 | 2566 | if ((reply->old_ia == NULL) || (reply->old_ia->num_iasubopt == 0)) |
bc7f8b8e | 2567 | return (ISC_FALSE); |
5279b8f3 | 2568 | |
1d17db44 FD |
2569 | for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { |
2570 | struct iasubopt *tmp; | |
5279b8f3 | 2571 | |
1d17db44 | 2572 | tmp = reply->old_ia->iasubopt[i]; |
5279b8f3 DH |
2573 | |
2574 | if (memcmp(addr->iabuf, &tmp->addr, 16) == 0) { | |
bc7f8b8e SR |
2575 | if (lease6_usable(tmp) == ISC_FALSE) { |
2576 | return (ISC_FALSE); | |
2577 | } | |
01fa619f SR |
2578 | |
2579 | pond = tmp->ipv6_pool->ipv6_pond; | |
2580 | if (((pond->prohibit_list != NULL) && | |
2581 | (permitted(reply->packet, pond->prohibit_list))) || | |
2582 | ((pond->permit_list != NULL) && | |
2583 | (!permitted(reply->packet, pond->permit_list)))) | |
2584 | return (ISC_FALSE); | |
2585 | ||
1d17db44 | 2586 | iasubopt_reference(&reply->lease, tmp, MDL); |
01fa619f | 2587 | |
bc7f8b8e | 2588 | return (ISC_TRUE); |
98bd7ca0 | 2589 | } |
98bd7ca0 DH |
2590 | } |
2591 | ||
bc7f8b8e | 2592 | return (ISC_FALSE); |
5279b8f3 DH |
2593 | } |
2594 | ||
80c9fdb0 FD |
2595 | /* Process a client-supplied IA_TA. This may append options to the tail of |
2596 | * the reply packet being built in the reply_state structure. | |
5279b8f3 DH |
2597 | */ |
2598 | static isc_result_t | |
80c9fdb0 FD |
2599 | reply_process_ia_ta(struct reply_state *reply, struct option_cache *ia) { |
2600 | isc_result_t status = ISC_R_SUCCESS; | |
2601 | u_int32_t iaid; | |
2602 | unsigned ia_cursor; | |
2603 | struct option_state *packet_ia; | |
2604 | struct option_cache *oc; | |
2605 | struct data_string ia_data, data; | |
2606 | struct data_string iaaddr; | |
2607 | u_int32_t pref_life, valid_life; | |
783259b1 | 2608 | struct iaddr tmp_addr; |
5279b8f3 | 2609 | |
80c9fdb0 FD |
2610 | /* Initialize values that will get cleaned up on return. */ |
2611 | packet_ia = NULL; | |
2612 | memset(&ia_data, 0, sizeof(ia_data)); | |
2613 | memset(&data, 0, sizeof(data)); | |
2614 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
5279b8f3 | 2615 | |
80c9fdb0 FD |
2616 | /* Make sure there is at least room for the header. */ |
2617 | if ((reply->cursor + IA_TA_OFFSET + 4) > sizeof(reply->buf)) { | |
2618 | log_error("reply_process_ia_ta: Reply too long for IA."); | |
2619 | return ISC_R_NOSPACE; | |
98bd7ca0 | 2620 | } |
98bd7ca0 | 2621 | |
5279b8f3 | 2622 | |
80c9fdb0 FD |
2623 | /* Fetch the IA_TA contents. */ |
2624 | if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, | |
2625 | ia, IA_TA_OFFSET)) { | |
9322442f | 2626 | log_error("reply_process_ia_ta: error evaluating ia"); |
80c9fdb0 FD |
2627 | status = ISC_R_FAILURE; |
2628 | goto cleanup; | |
98bd7ca0 | 2629 | } |
5279b8f3 | 2630 | |
80c9fdb0 FD |
2631 | /* Extract IA_TA header contents. */ |
2632 | iaid = getULong(ia_data.data); | |
5279b8f3 | 2633 | |
80c9fdb0 | 2634 | /* Create an IA_TA structure. */ |
783259b1 | 2635 | if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, |
9322442f FD |
2636 | reply->client_id.len, MDL) != ISC_R_SUCCESS) { |
2637 | log_error("reply_process_ia_ta: no memory for ia."); | |
80c9fdb0 FD |
2638 | status = ISC_R_NOMEMORY; |
2639 | goto cleanup; | |
98bd7ca0 | 2640 | } |
9322442f | 2641 | reply->ia->ia_type = D6O_IA_TA; |
5279b8f3 | 2642 | |
80c9fdb0 | 2643 | /* Cache pre-existing IA, if any. */ |
9322442f FD |
2644 | ia_hash_lookup(&reply->old_ia, ia_ta_active, |
2645 | (unsigned char *)reply->ia->iaid_duid.data, | |
2646 | reply->ia->iaid_duid.len, MDL); | |
80c9fdb0 FD |
2647 | |
2648 | /* | |
2649 | * Create an option cache to carry the IA_TA option contents, and | |
2650 | * execute any user-supplied values into it. | |
5279b8f3 | 2651 | */ |
80c9fdb0 FD |
2652 | if (!option_state_allocate(&reply->reply_ia, MDL)) { |
2653 | status = ISC_R_NOMEMORY; | |
2654 | goto cleanup; | |
98bd7ca0 | 2655 | } |
5279b8f3 | 2656 | |
80c9fdb0 FD |
2657 | /* |
2658 | * Temporary leases are dynamic by definition. | |
2659 | */ | |
2660 | reply->static_lease = ISC_FALSE; | |
5279b8f3 | 2661 | |
80c9fdb0 FD |
2662 | /* |
2663 | * Save the cursor position at the start of the IA, so we can | |
2664 | * set length later. We write a temporary | |
2665 | * header out now just in case we decide to adjust the packet | |
2666 | * within sub-process functions. | |
2667 | */ | |
2668 | ia_cursor = reply->cursor; | |
2669 | ||
2670 | /* Initialize the IA_TA header. First the code. */ | |
2671 | putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_TA); | |
2672 | reply->cursor += 2; | |
2673 | ||
2674 | /* Then option length. */ | |
2675 | putUShort(reply->buf.data + reply->cursor, 0x04u); | |
2676 | reply->cursor += 2; | |
2677 | ||
2678 | /* Then IA_TA header contents; IAID. */ | |
2679 | putULong(reply->buf.data + reply->cursor, iaid); | |
2680 | reply->cursor += 4; | |
2681 | ||
b31fe1d5 | 2682 | /* |
80c9fdb0 | 2683 | * Deal with an IAADDR for lifetimes. |
783259b1 | 2684 | * For all or none, process IAADDRs as hints. |
80c9fdb0 | 2685 | */ |
dce576b8 | 2686 | reply->min_valid = reply->min_prefer = 0xffffffff; |
80c9fdb0 FD |
2687 | reply->client_valid = reply->client_prefer = 0; |
2688 | oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAADDR); | |
783259b1 FD |
2689 | for (; oc != NULL; oc = oc->next) { |
2690 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
80c9fdb0 FD |
2691 | if (!evaluate_option_cache(&iaaddr, reply->packet, |
2692 | NULL, NULL, | |
2693 | reply->packet->options, NULL, | |
2694 | &global_scope, oc, MDL) || | |
2695 | (iaaddr.len < IAADDR_OFFSET)) { | |
2696 | log_error("reply_process_ia_ta: error " | |
2697 | "evaluating IAADDR."); | |
2698 | status = ISC_R_FAILURE; | |
2699 | goto cleanup; | |
2700 | } | |
2701 | /* The first 16 bytes are the IPv6 address. */ | |
2702 | pref_life = getULong(iaaddr.data + 16); | |
2703 | valid_life = getULong(iaaddr.data + 20); | |
2704 | ||
2705 | if ((reply->client_valid == 0) || | |
2706 | (reply->client_valid > valid_life)) | |
2707 | reply->client_valid = valid_life; | |
2708 | ||
2709 | if ((reply->client_prefer == 0) || | |
2710 | (reply->client_prefer > pref_life)) | |
2711 | reply->client_prefer = pref_life; | |
80c9fdb0 | 2712 | |
783259b1 FD |
2713 | /* Nothing more if something has failed. */ |
2714 | if (status == ISC_R_CANCELED) | |
2715 | continue; | |
2716 | ||
2717 | tmp_addr.len = 16; | |
2718 | memcpy(tmp_addr.iabuf, iaaddr.data, 16); | |
2719 | if (!temporary_is_available(reply, &tmp_addr)) | |
2720 | goto bad_temp; | |
2721 | status = reply_process_is_addressed(reply, | |
2722 | &reply->lease->scope, | |
01fa619f | 2723 | reply->lease->ipv6_pool->ipv6_pond->group); |
783259b1 FD |
2724 | if (status != ISC_R_SUCCESS) |
2725 | goto bad_temp; | |
2726 | status = reply_process_send_addr(reply, &tmp_addr); | |
2727 | if (status != ISC_R_SUCCESS) | |
2728 | goto bad_temp; | |
2729 | if (reply->lease != NULL) | |
2730 | iasubopt_dereference(&reply->lease, MDL); | |
2731 | continue; | |
2732 | ||
2733 | bad_temp: | |
2734 | /* Rewind the IA_TA to empty. */ | |
2735 | option_state_dereference(&reply->reply_ia, MDL); | |
2736 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
2737 | status = ISC_R_NOMEMORY; | |
80c9fdb0 FD |
2738 | goto cleanup; |
2739 | } | |
2740 | status = ISC_R_CANCELED; | |
783259b1 FD |
2741 | reply->client_resources = 0; |
2742 | reply->resources_included = ISC_FALSE; | |
2743 | if (reply->lease != NULL) | |
2744 | iasubopt_dereference(&reply->lease, MDL); | |
80c9fdb0 | 2745 | } |
783259b1 | 2746 | reply->ia_count++; |
80c9fdb0 FD |
2747 | |
2748 | /* | |
2749 | * Give the client temporary addresses. | |
2750 | */ | |
783259b1 FD |
2751 | if (reply->client_resources != 0) |
2752 | goto store; | |
80c9fdb0 FD |
2753 | status = find_client_temporaries(reply); |
2754 | if (status == ISC_R_NORESOURCES) { | |
2755 | switch (reply->packet->dhcpv6_msg_type) { | |
2756 | case DHCPV6_SOLICIT: | |
2757 | /* | |
2758 | * No address for any IA is handled | |
2759 | * by the caller. | |
2760 | */ | |
2761 | /* FALL THROUGH */ | |
2762 | ||
2763 | case DHCPV6_REQUEST: | |
2764 | /* Section 18.2.1 (Request): | |
2765 | * | |
2766 | * If the server cannot assign any addresses to | |
2767 | * an IA in the message from the client, the | |
2768 | * server MUST include the IA in the Reply | |
2769 | * message with no addresses in the IA and a | |
2770 | * Status Code option in the IA containing | |
2771 | * status code NoAddrsAvail. | |
2772 | */ | |
2773 | option_state_dereference(&reply->reply_ia, MDL); | |
2774 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
2775 | log_error("reply_process_ia_ta: No " | |
2776 | "memory for option state wipe."); | |
2777 | status = ISC_R_NOMEMORY; | |
2778 | goto cleanup; | |
2779 | } | |
2780 | ||
2781 | if (!set_status_code(STATUS_NoAddrsAvail, | |
2782 | "No addresses available " | |
2783 | "for this interface.", | |
2784 | reply->reply_ia)) { | |
2785 | log_error("reply_process_ia_ta: Unable " | |
2786 | "to set NoAddrsAvail status code."); | |
2787 | status = ISC_R_FAILURE; | |
2788 | goto cleanup; | |
2789 | } | |
2790 | ||
2791 | status = ISC_R_SUCCESS; | |
2792 | break; | |
2793 | ||
2794 | default: | |
783259b1 FD |
2795 | /* |
2796 | * We don't want to include the IA if we | |
2797 | * provide zero addresses including zeroed | |
2798 | * lifetimes. | |
2799 | */ | |
2800 | if (reply->resources_included) | |
2801 | status = ISC_R_SUCCESS; | |
2802 | else | |
2803 | goto cleanup; | |
2804 | break; | |
80c9fdb0 FD |
2805 | } |
2806 | } else if (status != ISC_R_SUCCESS) | |
2807 | goto cleanup; | |
2808 | ||
2809 | store: | |
2810 | reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, | |
2811 | sizeof(reply->buf) - reply->cursor, | |
2812 | reply->reply_ia, reply->packet, | |
2813 | required_opts_IA, NULL); | |
2814 | ||
2815 | /* Reset the length of this IA to match what was just written. */ | |
2816 | putUShort(reply->buf.data + ia_cursor + 2, | |
2817 | reply->cursor - (ia_cursor + 4)); | |
2818 | ||
2819 | /* | |
d9b5c150 SR |
2820 | * yes, goto's aren't the best but we also want to avoid extra |
2821 | * indents | |
2822 | */ | |
2823 | if (status == ISC_R_CANCELED) | |
2824 | goto cleanup; | |
2825 | ||
2826 | /* | |
2827 | * If we have any addresses log what we are doing. | |
2828 | */ | |
2829 | if (reply->ia->num_iasubopt != 0) { | |
2830 | struct iasubopt *tmp; | |
2831 | int i; | |
2832 | char tmp_addr[INET6_ADDRSTRLEN]; | |
2833 | ||
2834 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { | |
2835 | tmp = reply->ia->iasubopt[i]; | |
2836 | ||
2837 | log_info("%s TA: address %s to client with duid %s " | |
36c4a037 | 2838 | "iaid = %d valid for %u seconds", |
d9b5c150 SR |
2839 | dhcpv6_type_names[reply->buf.reply.msg_type], |
2840 | inet_ntop(AF_INET6, &tmp->addr, | |
2841 | tmp_addr, sizeof(tmp_addr)), | |
2842 | print_hex_1(reply->client_id.len, | |
2843 | reply->client_id.data, 60), | |
2844 | iaid, | |
2845 | tmp->valid); | |
2846 | } | |
2847 | } | |
2848 | ||
2849 | /* | |
2850 | * For hard bindings we consume the new changes into | |
2851 | * the database (if any have been attached to the ia_ta). | |
80c9fdb0 FD |
2852 | * |
2853 | * Loop through the assigned dynamic addresses, referencing the | |
2854 | * leases onto this IA_TA rather than any old ones, and updating | |
2855 | * pool timers for each (if any). | |
2856 | */ | |
d9b5c150 SR |
2857 | if ((reply->ia->num_iasubopt != 0) && |
2858 | (reply->buf.reply.msg_type == DHCPV6_REPLY)) { | |
1d17db44 | 2859 | struct iasubopt *tmp; |
80c9fdb0 FD |
2860 | struct data_string *ia_id; |
2861 | int i; | |
2862 | ||
1d17db44 FD |
2863 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { |
2864 | tmp = reply->ia->iasubopt[i]; | |
80c9fdb0 | 2865 | |
9322442f FD |
2866 | if (tmp->ia != NULL) |
2867 | ia_dereference(&tmp->ia, MDL); | |
2868 | ia_reference(&tmp->ia, reply->ia, MDL); | |
80c9fdb0 | 2869 | |
5d89d60f | 2870 | /* Commit 'hard' bindings. */ |
5d89d60f | 2871 | renew_lease6(tmp->ipv6_pool, tmp); |
80c9fdb0 FD |
2872 | schedule_lease_timeout(tmp->ipv6_pool); |
2873 | ||
a7341359 SR |
2874 | /* If we have anything to do on commit do it now */ |
2875 | if (tmp->on_star.on_commit != NULL) { | |
2876 | execute_statements(NULL, reply->packet, | |
b31fe1d5 | 2877 | NULL, NULL, |
a7341359 SR |
2878 | reply->packet->options, |
2879 | reply->opt_state, | |
58cb5d86 | 2880 | &tmp->scope, |
a7341359 SR |
2881 | tmp->on_star.on_commit, |
2882 | &tmp->on_star); | |
2883 | executable_statement_dereference | |
2884 | (&tmp->on_star.on_commit, MDL); | |
2885 | } | |
2886 | ||
98bf1607 | 2887 | #if defined (NSUPDATE) |
80c9fdb0 FD |
2888 | /* |
2889 | * Perform ddns updates. | |
2890 | */ | |
2891 | oc = lookup_option(&server_universe, reply->opt_state, | |
2892 | SV_DDNS_UPDATES); | |
2893 | if ((oc == NULL) || | |
2894 | evaluate_boolean_option_cache(NULL, reply->packet, | |
2895 | NULL, NULL, | |
2896 | reply->packet->options, | |
2897 | reply->opt_state, | |
2898 | &tmp->scope, | |
2899 | oc, MDL)) { | |
2900 | ddns_updates(reply->packet, NULL, NULL, | |
2901 | tmp, NULL, reply->opt_state); | |
2902 | } | |
98bf1607 | 2903 | #endif |
250f7134 SR |
2904 | /* Do our threshold check. */ |
2905 | check_pool6_threshold(reply, tmp); | |
80c9fdb0 FD |
2906 | } |
2907 | ||
9322442f | 2908 | /* Remove any old ia from the hash. */ |
80c9fdb0 FD |
2909 | if (reply->old_ia != NULL) { |
2910 | ia_id = &reply->old_ia->iaid_duid; | |
9322442f FD |
2911 | ia_hash_delete(ia_ta_active, |
2912 | (unsigned char *)ia_id->data, | |
2913 | ia_id->len, MDL); | |
2914 | ia_dereference(&reply->old_ia, MDL); | |
80c9fdb0 FD |
2915 | } |
2916 | ||
9322442f | 2917 | /* Put new ia into the hash. */ |
1acab09f | 2918 | reply->ia->cltt = cur_time; |
9322442f FD |
2919 | ia_id = &reply->ia->iaid_duid; |
2920 | ia_hash_add(ia_ta_active, (unsigned char *)ia_id->data, | |
2921 | ia_id->len, reply->ia, MDL); | |
80c9fdb0 | 2922 | |
9322442f | 2923 | write_ia(reply->ia); |
ad80055f SR |
2924 | } else { |
2925 | schedule_lease_timeout_reply(reply); | |
80c9fdb0 FD |
2926 | } |
2927 | ||
2928 | cleanup: | |
2929 | if (packet_ia != NULL) | |
2930 | option_state_dereference(&packet_ia, MDL); | |
2931 | if (iaaddr.data != NULL) | |
2932 | data_string_forget(&iaaddr, MDL); | |
2933 | if (reply->reply_ia != NULL) | |
2934 | option_state_dereference(&reply->reply_ia, MDL); | |
2935 | if (ia_data.data != NULL) | |
2936 | data_string_forget(&ia_data, MDL); | |
2937 | if (data.data != NULL) | |
2938 | data_string_forget(&data, MDL); | |
9322442f FD |
2939 | if (reply->ia != NULL) |
2940 | ia_dereference(&reply->ia, MDL); | |
80c9fdb0 | 2941 | if (reply->old_ia != NULL) |
9322442f | 2942 | ia_dereference(&reply->old_ia, MDL); |
5d89d60f | 2943 | if (reply->lease != NULL) |
1d17db44 | 2944 | iasubopt_dereference(&reply->lease, MDL); |
80c9fdb0 FD |
2945 | |
2946 | /* | |
2947 | * ISC_R_CANCELED is a status code used by the addr processing to | |
783259b1 | 2948 | * indicate we're replying with other addresses. This is still a |
80c9fdb0 FD |
2949 | * success at higher layers. |
2950 | */ | |
2951 | return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); | |
2952 | } | |
2953 | ||
783259b1 FD |
2954 | /* |
2955 | * Verify the temporary address is available. | |
2956 | */ | |
2957 | static isc_boolean_t | |
2958 | temporary_is_available(struct reply_state *reply, struct iaddr *addr) { | |
2959 | struct in6_addr tmp_addr; | |
2960 | struct subnet *subnet; | |
01fa619f SR |
2961 | struct ipv6_pool *pool = NULL; |
2962 | struct ipv6_pond *pond = NULL; | |
783259b1 FD |
2963 | int i; |
2964 | ||
2965 | memcpy(&tmp_addr, addr->iabuf, sizeof(tmp_addr)); | |
2966 | /* | |
2967 | * Clients may choose to send :: as an address, with the idea to give | |
2968 | * hints about preferred-lifetime or valid-lifetime. | |
2969 | * So this is not a request for this address. | |
2970 | */ | |
2971 | if (IN6_IS_ADDR_UNSPECIFIED(&tmp_addr)) | |
2972 | return ISC_FALSE; | |
2973 | ||
2974 | /* | |
2975 | * Verify that this address is on the client's network. | |
2976 | */ | |
2977 | for (subnet = reply->shared->subnets ; subnet != NULL ; | |
2978 | subnet = subnet->next_sibling) { | |
2979 | if (addr_eq(subnet_number(*addr, subnet->netmask), | |
2980 | subnet->net)) | |
2981 | break; | |
2982 | } | |
2983 | ||
2984 | /* Address not found on shared network. */ | |
2985 | if (subnet == NULL) | |
2986 | return ISC_FALSE; | |
2987 | ||
2988 | /* | |
2989 | * Check if this address is owned (must be before next step). | |
2990 | */ | |
2991 | if (address_is_owned(reply, addr)) | |
2992 | return ISC_TRUE; | |
2993 | ||
2994 | /* | |
2995 | * Verify that this address is in a temporary pool and try to get it. | |
2996 | */ | |
01fa619f SR |
2997 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { |
2998 | if (((pond->prohibit_list != NULL) && | |
2999 | (permitted(reply->packet, pond->prohibit_list))) || | |
3000 | ((pond->permit_list != NULL) && | |
3001 | (!permitted(reply->packet, pond->permit_list)))) | |
783259b1 | 3002 | continue; |
01fa619f SR |
3003 | |
3004 | for (i = 0 ; (pool = pond->ipv6_pools[i]) != NULL ; i++) { | |
3005 | if (pool->pool_type != D6O_IA_TA) | |
3006 | continue; | |
3007 | ||
3008 | if (ipv6_in_pool(&tmp_addr, pool)) | |
3009 | break; | |
3010 | } | |
3011 | ||
3012 | if (pool != NULL) | |
783259b1 FD |
3013 | break; |
3014 | } | |
01fa619f | 3015 | |
783259b1 FD |
3016 | if (pool == NULL) |
3017 | return ISC_FALSE; | |
3018 | if (lease6_exists(pool, &tmp_addr)) | |
3019 | return ISC_FALSE; | |
3020 | if (iasubopt_allocate(&reply->lease, MDL) != ISC_R_SUCCESS) | |
3021 | return ISC_FALSE; | |
3022 | reply->lease->addr = tmp_addr; | |
3023 | reply->lease->plen = 0; | |
3024 | /* Default is soft binding for 2 minutes. */ | |
3025 | if (add_lease6(pool, reply->lease, cur_time + 120) != ISC_R_SUCCESS) | |
3026 | return ISC_FALSE; | |
3027 | ||
3028 | return ISC_TRUE; | |
3029 | } | |
3030 | ||
80c9fdb0 FD |
3031 | /* |
3032 | * Get a temporary address per prefix. | |
3033 | */ | |
3034 | static isc_result_t | |
3035 | find_client_temporaries(struct reply_state *reply) { | |
80c9fdb0 | 3036 | int i; |
f1ef85cf | 3037 | struct ipv6_pool *p = NULL; |
01fa619f SR |
3038 | struct ipv6_pond *pond; |
3039 | isc_result_t status = ISC_R_NORESOURCES;; | |
80c9fdb0 FD |
3040 | unsigned int attempts; |
3041 | struct iaddr send_addr; | |
3042 | ||
3043 | /* | |
01fa619f SR |
3044 | * Do a quick walk through of the ponds and pools |
3045 | * to see if we have any prefix pools | |
80c9fdb0 | 3046 | */ |
01fa619f SR |
3047 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { |
3048 | if (pond->ipv6_pools == NULL) | |
3049 | continue; | |
3050 | ||
3051 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { | |
3052 | if (p->pool_type == D6O_IA_TA) | |
3053 | break; | |
3054 | } | |
3055 | if (p != NULL) | |
3056 | break; | |
3057 | } | |
3058 | ||
3059 | /* If we get here and p is NULL we have no useful pools */ | |
3060 | if (p == NULL) { | |
80c9fdb0 FD |
3061 | log_debug("Unable to get client addresses: " |
3062 | "no IPv6 pools on this shared network"); | |
3063 | return ISC_R_NORESOURCES; | |
3064 | } | |
3065 | ||
01fa619f SR |
3066 | /* |
3067 | * We have at least one pool that could provide an address | |
3068 | * Now we walk through the ponds and pools again and check | |
3069 | * to see if the client is permitted and if an address is | |
3070 | * available | |
3071 | */ | |
3072 | ||
3073 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
3074 | if (((pond->prohibit_list != NULL) && | |
3075 | (permitted(reply->packet, pond->prohibit_list))) || | |
3076 | ((pond->permit_list != NULL) && | |
3077 | (!permitted(reply->packet, pond->permit_list)))) | |
80c9fdb0 | 3078 | continue; |
80c9fdb0 | 3079 | |
01fa619f SR |
3080 | for (i = 0; (p = pond->ipv6_pools[i]) != NULL; i++) { |
3081 | if (p->pool_type != D6O_IA_TA) { | |
3082 | continue; | |
3083 | } | |
80c9fdb0 | 3084 | |
01fa619f SR |
3085 | /* |
3086 | * Get an address in this temporary pool. | |
3087 | */ | |
3088 | status = create_lease6(p, &reply->lease, &attempts, | |
3089 | &reply->client_id, cur_time + 120); | |
3090 | if (status != ISC_R_SUCCESS) { | |
3091 | log_debug("Unable to get a temporary address."); | |
3092 | goto cleanup; | |
3093 | } | |
3094 | ||
3095 | status = reply_process_is_addressed(reply, | |
3096 | &reply->lease->scope, | |
3097 | pond->group); | |
3098 | if (status != ISC_R_SUCCESS) { | |
3099 | goto cleanup; | |
3100 | } | |
3101 | send_addr.len = 16; | |
3102 | memcpy(send_addr.iabuf, &reply->lease->addr, 16); | |
3103 | status = reply_process_send_addr(reply, &send_addr); | |
3104 | if (status != ISC_R_SUCCESS) { | |
3105 | goto cleanup; | |
3106 | } | |
3107 | /* | |
3108 | * reply->lease can't be null as we use it above | |
3109 | * add check if that changes | |
3110 | */ | |
3111 | iasubopt_dereference(&reply->lease, MDL); | |
80c9fdb0 | 3112 | } |
80c9fdb0 FD |
3113 | } |
3114 | ||
3115 | cleanup: | |
3116 | if (reply->lease != NULL) { | |
1d17db44 | 3117 | iasubopt_dereference(&reply->lease, MDL); |
80c9fdb0 FD |
3118 | } |
3119 | return status; | |
3120 | } | |
3121 | ||
3122 | /* | |
3123 | * This function only returns failure on 'hard' failures. If it succeeds, | |
3124 | * it will leave a lease structure behind. | |
3125 | */ | |
3126 | static isc_result_t | |
3127 | reply_process_try_addr(struct reply_state *reply, struct iaddr *addr) { | |
d19fa5a1 | 3128 | isc_result_t status = ISC_R_ADDRNOTAVAIL; |
01fa619f SR |
3129 | struct ipv6_pool *pool = NULL; |
3130 | struct ipv6_pond *pond = NULL; | |
80c9fdb0 FD |
3131 | int i; |
3132 | struct data_string data_addr; | |
3133 | ||
3134 | if ((reply == NULL) || (reply->shared == NULL) || | |
d19fa5a1 SR |
3135 | (addr == NULL) || (reply->lease != NULL)) |
3136 | return (DHCP_R_INVALIDARG); | |
3137 | ||
01fa619f SR |
3138 | /* |
3139 | * Do a quick walk through of the ponds and pools | |
3140 | * to see if we have any NA address pools | |
3141 | */ | |
3142 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
3143 | if (pond->ipv6_pools == NULL) | |
3144 | continue; | |
3145 | ||
3146 | for (i = 0; ; i++) { | |
3147 | pool = pond->ipv6_pools[i]; | |
3148 | if ((pool == NULL) || | |
3149 | (pool->pool_type == D6O_IA_NA)) | |
3150 | break; | |
3151 | } | |
3152 | if (pool != NULL) | |
3153 | break; | |
3154 | } | |
3155 | ||
3156 | /* If we get here and p is NULL we have no useful pools */ | |
3157 | if (pool == NULL) { | |
d19fa5a1 | 3158 | return (ISC_R_ADDRNOTAVAIL); |
01fa619f | 3159 | } |
80c9fdb0 FD |
3160 | |
3161 | memset(&data_addr, 0, sizeof(data_addr)); | |
3162 | data_addr.len = addr->len; | |
3163 | data_addr.data = addr->iabuf; | |
3164 | ||
01fa619f SR |
3165 | /* |
3166 | * We have at least one pool that could provide an address | |
3167 | * Now we walk through the ponds and pools again and check | |
3168 | * to see if the client is permitted and if an address is | |
3169 | * available | |
b31fe1d5 | 3170 | * |
01fa619f SR |
3171 | * Within a given pond we start looking at the last pool we |
3172 | * allocated from, unless it had a collision trying to allocate | |
3173 | * an address. This will tend to move us into less-filled pools. | |
3174 | */ | |
3175 | ||
3176 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
3177 | if (((pond->prohibit_list != NULL) && | |
3178 | (permitted(reply->packet, pond->prohibit_list))) || | |
3179 | ((pond->permit_list != NULL) && | |
3180 | (!permitted(reply->packet, pond->permit_list)))) | |
9322442f | 3181 | continue; |
01fa619f SR |
3182 | |
3183 | for (i = 0 ; (pool = pond->ipv6_pools[i]) != NULL ; i++) { | |
3184 | if (pool->pool_type != D6O_IA_NA) | |
3185 | continue; | |
3186 | ||
3187 | status = try_client_v6_address(&reply->lease, pool, | |
3188 | &data_addr); | |
3189 | if (status == ISC_R_SUCCESS) | |
3190 | break; | |
3191 | } | |
3192 | ||
80c9fdb0 FD |
3193 | if (status == ISC_R_SUCCESS) |
3194 | break; | |
3195 | } | |
3196 | ||
3197 | /* Note that this is just pedantry. There is no allocation to free. */ | |
3198 | data_string_forget(&data_addr, MDL); | |
3199 | /* Return just the most recent status... */ | |
d19fa5a1 | 3200 | return (status); |
80c9fdb0 FD |
3201 | } |
3202 | ||
3203 | /* Look around for an address to give the client. First, look through the | |
3204 | * old IA for addresses we can extend. Second, try to allocate a new address. | |
3205 | * Finally, actually add that address into the current reply IA. | |
3206 | */ | |
3207 | static isc_result_t | |
3208 | find_client_address(struct reply_state *reply) { | |
3209 | struct iaddr send_addr; | |
3210 | isc_result_t status = ISC_R_NORESOURCES; | |
1d17db44 | 3211 | struct iasubopt *lease, *best_lease = NULL; |
80c9fdb0 FD |
3212 | struct binding_scope **scope; |
3213 | struct group *group; | |
3214 | int i; | |
3215 | ||
80c9fdb0 FD |
3216 | if (reply->static_lease) { |
3217 | if (reply->host == NULL) | |
98bf1607 | 3218 | return DHCP_R_INVALIDARG; |
80c9fdb0 FD |
3219 | |
3220 | send_addr.len = 16; | |
3221 | memcpy(send_addr.iabuf, reply->fixed.data, 16); | |
3222 | ||
80c9fdb0 | 3223 | scope = &global_scope; |
2267da84 | 3224 | group = reply->subnet->group; |
80c9fdb0 FD |
3225 | goto send_addr; |
3226 | } | |
3227 | ||
3228 | if (reply->old_ia != NULL) { | |
1d17db44 | 3229 | for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { |
0d8c3d6e | 3230 | struct shared_network *candidate_shared; |
01fa619f | 3231 | struct ipv6_pond *pond; |
0d8c3d6e | 3232 | |
1d17db44 | 3233 | lease = reply->old_ia->iasubopt[i]; |
0d8c3d6e | 3234 | candidate_shared = lease->ipv6_pool->shared_network; |
01fa619f | 3235 | pond = lease->ipv6_pool->ipv6_pond; |
80c9fdb0 | 3236 | |
0d8c3d6e DH |
3237 | /* |
3238 | * Look for the best lease on the client's shared | |
01fa619f | 3239 | * network, that is still permitted |
0d8c3d6e | 3240 | */ |
01fa619f SR |
3241 | |
3242 | if ((candidate_shared != reply->shared) || | |
3243 | (lease6_usable(lease) != ISC_TRUE)) | |
3244 | continue; | |
3245 | ||
3246 | if (((pond->prohibit_list != NULL) && | |
3247 | (permitted(reply->packet, pond->prohibit_list))) || | |
3248 | ((pond->permit_list != NULL) && | |
3249 | (!permitted(reply->packet, pond->permit_list)))) | |
3250 | continue; | |
3251 | ||
3252 | best_lease = lease_compare(lease, best_lease); | |
80c9fdb0 FD |
3253 | } |
3254 | } | |
3255 | ||
3256 | /* Try to pick a new address if we didn't find one, or if we found an | |
3257 | * abandoned lease. | |
3258 | */ | |
3259 | if ((best_lease == NULL) || (best_lease->state == FTS_ABANDONED)) { | |
01fa619f | 3260 | status = pick_v6_address(reply); |
80c9fdb0 | 3261 | } else if (best_lease != NULL) { |
1d17db44 | 3262 | iasubopt_reference(&reply->lease, best_lease, MDL); |
80c9fdb0 FD |
3263 | status = ISC_R_SUCCESS; |
3264 | } | |
3265 | ||
3266 | /* Pick the abandoned lease as a last resort. */ | |
3267 | if ((status == ISC_R_NORESOURCES) && (best_lease != NULL)) { | |
3268 | /* I don't see how this is supposed to be done right now. */ | |
fb98e02e TM |
3269 | log_error("Best match for DUID %s is an abandoned address," |
3270 | " This may be a result of multiple clients attempting" | |
3271 | " to use this DUID", | |
3272 | print_hex_1(reply->client_id.len, | |
3273 | reply->client_id.data, 60)); | |
1d17db44 | 3274 | /* iasubopt_reference(&reply->lease, best_lease, MDL); */ |
80c9fdb0 FD |
3275 | } |
3276 | ||
3277 | /* Give up now if we didn't find a lease. */ | |
3278 | if (status != ISC_R_SUCCESS) | |
3279 | return status; | |
3280 | ||
3281 | if (reply->lease == NULL) | |
3282 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3283 | ||
7d6180be DH |
3284 | /* Draw binding scopes from the lease's binding scope, and config |
3285 | * from the lease's containing subnet and higher. Note that it may | |
3286 | * be desirable to place the group attachment directly in the pool. | |
3287 | */ | |
80c9fdb0 | 3288 | scope = &reply->lease->scope; |
01fa619f | 3289 | group = reply->lease->ipv6_pool->ipv6_pond->group; |
80c9fdb0 FD |
3290 | |
3291 | send_addr.len = 16; | |
3292 | memcpy(send_addr.iabuf, &reply->lease->addr, 16); | |
3293 | ||
3294 | send_addr: | |
9322442f | 3295 | status = reply_process_is_addressed(reply, scope, group); |
80c9fdb0 FD |
3296 | if (status != ISC_R_SUCCESS) |
3297 | return status; | |
3298 | ||
3299 | status = reply_process_send_addr(reply, &send_addr); | |
3300 | return status; | |
3301 | } | |
3302 | ||
3303 | /* Once an address is found for a client, perform several common functions; | |
3304 | * Calculate and store valid and preferred lease times, draw client options | |
3305 | * into the option state. | |
3306 | */ | |
3307 | static isc_result_t | |
9322442f | 3308 | reply_process_is_addressed(struct reply_state *reply, |
80c9fdb0 FD |
3309 | struct binding_scope **scope, struct group *group) |
3310 | { | |
3311 | isc_result_t status = ISC_R_SUCCESS; | |
3312 | struct data_string data; | |
3313 | struct option_cache *oc; | |
a7341359 SR |
3314 | struct option_state *tmp_options = NULL; |
3315 | struct on_star *on_star; | |
01fa619f | 3316 | int i; |
80c9fdb0 FD |
3317 | |
3318 | /* Initialize values we will cleanup. */ | |
3319 | memset(&data, 0, sizeof(data)); | |
3320 | ||
a7341359 SR |
3321 | /* |
3322 | * Find the proper on_star block to use. We use the | |
3323 | * one in the lease if we have a lease or the one in | |
3324 | * the reply if we don't have a lease because this is | |
3325 | * a static instance | |
3326 | */ | |
3327 | if (reply->lease) { | |
3328 | on_star = &reply->lease->on_star; | |
3329 | } else { | |
3330 | on_star = &reply->on_star; | |
3331 | } | |
3332 | ||
3333 | /* | |
3334 | * Bring in the root configuration. We only do this to bring | |
3335 | * in the on * statements, as we didn't have the lease available | |
3336 | * we did it the first time. | |
3337 | */ | |
3338 | option_state_allocate(&tmp_options, MDL); | |
3339 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3340 | reply->packet->options, tmp_options, | |
3341 | &global_scope, root_group, NULL, | |
3342 | on_star); | |
3343 | if (tmp_options != NULL) { | |
3344 | option_state_dereference(&tmp_options, MDL); | |
3345 | } | |
3346 | ||
2267da84 DH |
3347 | /* |
3348 | * Bring configured options into the root packet level cache - start | |
3349 | * with the lease's closest enclosing group (passed in by the caller | |
3350 | * as 'group'). | |
3351 | */ | |
80c9fdb0 FD |
3352 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, |
3353 | reply->packet->options, reply->opt_state, | |
a7341359 | 3354 | scope, group, root_group, on_star); |
80c9fdb0 | 3355 | |
01fa619f SR |
3356 | /* Execute statements from class scopes. */ |
3357 | for (i = reply->packet->class_count; i > 0; i--) { | |
3358 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3359 | reply->packet->options, | |
3360 | reply->opt_state, scope, | |
3361 | reply->packet->classes[i - 1]->group, | |
3362 | group, on_star); | |
3363 | } | |
3364 | ||
2267da84 DH |
3365 | /* |
3366 | * If there is a host record, over-ride with values configured there, | |
3367 | * without re-evaluating configuration from the previously executed | |
3368 | * group or its common enclosers. | |
3369 | */ | |
3370 | if (reply->host != NULL) | |
3371 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3372 | reply->packet->options, | |
3373 | reply->opt_state, scope, | |
a7341359 SR |
3374 | reply->host->group, group, |
3375 | on_star); | |
2267da84 | 3376 | |
80c9fdb0 FD |
3377 | /* Determine valid lifetime. */ |
3378 | if (reply->client_valid == 0) | |
3379 | reply->send_valid = DEFAULT_DEFAULT_LEASE_TIME; | |
3380 | else | |
3381 | reply->send_valid = reply->client_valid; | |
3382 | ||
3383 | oc = lookup_option(&server_universe, reply->opt_state, | |
3384 | SV_DEFAULT_LEASE_TIME); | |
3385 | if (oc != NULL) { | |
3386 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
3387 | reply->packet->options, | |
3388 | reply->opt_state, | |
3389 | scope, oc, MDL) || | |
3390 | (data.len != 4)) { | |
3391 | log_error("reply_process_is_addressed: unable to " | |
3392 | "evaluate default lease time"); | |
3393 | status = ISC_R_FAILURE; | |
3394 | goto cleanup; | |
3395 | } | |
3396 | ||
3397 | reply->send_valid = getULong(data.data); | |
3398 | data_string_forget(&data, MDL); | |
3399 | } | |
3400 | ||
36c4a037 SR |
3401 | /* Check to see if the lease time would cause us to wrap |
3402 | * in which case we make it infinite. | |
3403 | * The following doesn't work on at least some systems: | |
3404 | * (cur_time + reply->send_valid < cur_time) | |
3405 | */ | |
3406 | if (reply->send_valid != 0xFFFFFFFF) { | |
3407 | time_t test_time = cur_time + reply->send_valid; | |
3408 | if (test_time < cur_time) | |
3409 | reply->send_valid = 0xFFFFFFFF; | |
3410 | } | |
3411 | ||
80c9fdb0 FD |
3412 | if (reply->client_prefer == 0) |
3413 | reply->send_prefer = reply->send_valid; | |
3414 | else | |
3415 | reply->send_prefer = reply->client_prefer; | |
3416 | ||
36c4a037 SR |
3417 | if ((reply->send_prefer >= reply->send_valid) && |
3418 | (reply->send_valid != 0xFFFFFFFF)) | |
80c9fdb0 FD |
3419 | reply->send_prefer = (reply->send_valid / 2) + |
3420 | (reply->send_valid / 8); | |
3421 | ||
3422 | oc = lookup_option(&server_universe, reply->opt_state, | |
3423 | SV_PREFER_LIFETIME); | |
3424 | if (oc != NULL) { | |
3425 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
3426 | reply->packet->options, | |
3427 | reply->opt_state, | |
3428 | scope, oc, MDL) || | |
3429 | (data.len != 4)) { | |
3430 | log_error("reply_process_is_addressed: unable to " | |
3431 | "evaluate preferred lease time"); | |
3432 | status = ISC_R_FAILURE; | |
3433 | goto cleanup; | |
3434 | } | |
3435 | ||
3436 | reply->send_prefer = getULong(data.data); | |
3437 | data_string_forget(&data, MDL); | |
3438 | } | |
3439 | ||
3440 | /* Note lowest values for later calculation of renew/rebind times. */ | |
dce576b8 TM |
3441 | if (reply->min_prefer > reply->send_prefer) |
3442 | reply->min_prefer = reply->send_prefer; | |
80c9fdb0 | 3443 | |
dce576b8 TM |
3444 | if (reply->min_valid > reply->send_valid) |
3445 | reply->min_valid = reply->send_valid; | |
80c9fdb0 FD |
3446 | |
3447 | #if 0 | |
3448 | /* | |
3449 | * XXX: Old 4.0.0 alpha code would change the host {} record | |
3450 | * XXX: uid upon lease assignment. This was intended to cover the | |
3451 | * XXX: case where a client first identifies itself using vendor | |
3452 | * XXX: options in a solicit, or request, but later neglects to include | |
3453 | * XXX: these options in a Renew or Rebind. It is not clear that this | |
3454 | * XXX: is required, and has some startling ramifications (such as | |
3455 | * XXX: how to recover this dynamic host {} state across restarts). | |
3456 | */ | |
3457 | if (reply->host != NULL) | |
3458 | change_host_uid(host, reply->client_id->data, | |
3459 | reply->client_id->len); | |
3460 | #endif /* 0 */ | |
3461 | ||
3462 | /* Perform dynamic lease related update work. */ | |
3463 | if (reply->lease != NULL) { | |
1acab09f FD |
3464 | /* Cached lifetimes */ |
3465 | reply->lease->prefer = reply->send_prefer; | |
3466 | reply->lease->valid = reply->send_valid; | |
3467 | ||
36c4a037 SR |
3468 | /* Advance (or rewind) the valid lifetime. |
3469 | * In the protocol 0xFFFFFFFF is infinite | |
3470 | * when connecting to the lease file MAX_TIME is | |
3471 | */ | |
5d89d60f | 3472 | if (reply->buf.reply.msg_type == DHCPV6_REPLY) { |
36c4a037 SR |
3473 | if (reply->send_valid == 0xFFFFFFFF) { |
3474 | reply->lease->soft_lifetime_end_time = MAX_TIME; | |
3475 | } else { | |
3476 | reply->lease->soft_lifetime_end_time = | |
3477 | cur_time + reply->send_valid; | |
3478 | } | |
5d89d60f FD |
3479 | /* Wait before renew! */ |
3480 | } | |
80c9fdb0 | 3481 | |
1d17db44 | 3482 | status = ia_add_iasubopt(reply->ia, reply->lease, MDL); |
80c9fdb0 FD |
3483 | if (status != ISC_R_SUCCESS) { |
3484 | log_fatal("reply_process_is_addressed: Unable to " | |
3485 | "attach lease to new IA: %s", | |
3486 | isc_result_totext(status)); | |
3487 | } | |
3488 | ||
3489 | /* | |
3490 | * If this is a new lease, make sure it is attached somewhere. | |
3491 | */ | |
9322442f FD |
3492 | if (reply->lease->ia == NULL) { |
3493 | ia_reference(&reply->lease->ia, reply->ia, MDL); | |
80c9fdb0 FD |
3494 | } |
3495 | } | |
3496 | ||
3497 | /* Bring a copy of the relevant options into the IA scope. */ | |
3498 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3499 | reply->packet->options, reply->reply_ia, | |
a7341359 | 3500 | scope, group, root_group, NULL); |
80c9fdb0 | 3501 | |
01fa619f SR |
3502 | /* Execute statements from class scopes. */ |
3503 | for (i = reply->packet->class_count; i > 0; i--) { | |
3504 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3505 | reply->packet->options, | |
3506 | reply->reply_ia, scope, | |
3507 | reply->packet->classes[i - 1]->group, | |
3508 | group, NULL); | |
3509 | } | |
b31fe1d5 | 3510 | |
2267da84 DH |
3511 | /* |
3512 | * And bring in host record configuration, if any, but not to overlap | |
3513 | * the previous group or its common enclosers. | |
3514 | */ | |
3515 | if (reply->host != NULL) | |
3516 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
3517 | reply->packet->options, | |
3518 | reply->reply_ia, scope, | |
a7341359 | 3519 | reply->host->group, group, NULL); |
2267da84 | 3520 | |
80c9fdb0 FD |
3521 | cleanup: |
3522 | if (data.data != NULL) | |
3523 | data_string_forget(&data, MDL); | |
3524 | ||
3525 | if (status == ISC_R_SUCCESS) | |
3526 | reply->client_resources++; | |
3527 | ||
3528 | return status; | |
3529 | } | |
3530 | ||
3531 | /* Simply send an IAADDR within the IA scope as described. */ | |
3532 | static isc_result_t | |
3533 | reply_process_send_addr(struct reply_state *reply, struct iaddr *addr) { | |
3534 | isc_result_t status = ISC_R_SUCCESS; | |
3535 | struct data_string data; | |
3536 | ||
3537 | memset(&data, 0, sizeof(data)); | |
3538 | ||
3539 | /* Now append the lease. */ | |
3540 | data.len = IAADDR_OFFSET; | |
3541 | if (!buffer_allocate(&data.buffer, data.len, MDL)) { | |
3542 | log_error("reply_process_send_addr: out of memory" | |
3543 | "allocating new IAADDR buffer."); | |
3544 | status = ISC_R_NOMEMORY; | |
3545 | goto cleanup; | |
3546 | } | |
3547 | data.data = data.buffer->data; | |
3548 | ||
3549 | memcpy(data.buffer->data, addr->iabuf, 16); | |
3550 | putULong(data.buffer->data + 16, reply->send_prefer); | |
3551 | putULong(data.buffer->data + 20, reply->send_valid); | |
3552 | ||
3553 | if (!append_option_buffer(&dhcpv6_universe, reply->reply_ia, | |
3554 | data.buffer, data.buffer->data, | |
3555 | data.len, D6O_IAADDR, 0)) { | |
3556 | log_error("reply_process_send_addr: unable " | |
3557 | "to save IAADDR option"); | |
3558 | status = ISC_R_FAILURE; | |
3559 | goto cleanup; | |
3560 | } | |
3561 | ||
9322442f | 3562 | reply->resources_included = ISC_TRUE; |
80c9fdb0 FD |
3563 | |
3564 | cleanup: | |
3565 | if (data.data != NULL) | |
3566 | data_string_forget(&data, MDL); | |
3567 | ||
3568 | return status; | |
3569 | } | |
3570 | ||
3571 | /* Choose the better of two leases. */ | |
1d17db44 FD |
3572 | static struct iasubopt * |
3573 | lease_compare(struct iasubopt *alpha, struct iasubopt *beta) { | |
80c9fdb0 FD |
3574 | if (alpha == NULL) |
3575 | return beta; | |
3576 | if (beta == NULL) | |
3577 | return alpha; | |
3578 | ||
3579 | switch(alpha->state) { | |
3580 | case FTS_ACTIVE: | |
3581 | switch(beta->state) { | |
3582 | case FTS_ACTIVE: | |
3583 | /* Choose the lease with the longest lifetime (most | |
3584 | * likely the most recently allocated). | |
3585 | */ | |
b31fe1d5 | 3586 | if (alpha->hard_lifetime_end_time < |
5d89d60f | 3587 | beta->hard_lifetime_end_time) |
80c9fdb0 FD |
3588 | return beta; |
3589 | else | |
3590 | return alpha; | |
3591 | ||
3592 | case FTS_EXPIRED: | |
3593 | case FTS_ABANDONED: | |
3594 | return alpha; | |
3595 | ||
3596 | default: | |
3597 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3598 | } | |
3599 | break; | |
3600 | ||
3601 | case FTS_EXPIRED: | |
3602 | switch (beta->state) { | |
3603 | case FTS_ACTIVE: | |
3604 | return beta; | |
3605 | ||
3606 | case FTS_EXPIRED: | |
3607 | /* Choose the most recently expired lease. */ | |
5d89d60f FD |
3608 | if (alpha->hard_lifetime_end_time < |
3609 | beta->hard_lifetime_end_time) | |
3610 | return beta; | |
3611 | else if ((alpha->hard_lifetime_end_time == | |
3612 | beta->hard_lifetime_end_time) && | |
3613 | (alpha->soft_lifetime_end_time < | |
3614 | beta->soft_lifetime_end_time)) | |
80c9fdb0 FD |
3615 | return beta; |
3616 | else | |
3617 | return alpha; | |
3618 | ||
3619 | case FTS_ABANDONED: | |
3620 | return alpha; | |
3621 | ||
3622 | default: | |
3623 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3624 | } | |
3625 | break; | |
3626 | ||
3627 | case FTS_ABANDONED: | |
3628 | switch (beta->state) { | |
3629 | case FTS_ACTIVE: | |
3630 | case FTS_EXPIRED: | |
3631 | return alpha; | |
3632 | ||
3633 | case FTS_ABANDONED: | |
3634 | /* Choose the lease that was abandoned longest ago. */ | |
5d89d60f FD |
3635 | if (alpha->hard_lifetime_end_time < |
3636 | beta->hard_lifetime_end_time) | |
80c9fdb0 | 3637 | return alpha; |
a07d99bb TM |
3638 | else |
3639 | return beta; | |
80c9fdb0 FD |
3640 | |
3641 | default: | |
3642 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3643 | } | |
3644 | break; | |
3645 | ||
3646 | default: | |
3647 | log_fatal("Impossible condition at %s:%d.", MDL); | |
3648 | } | |
3649 | ||
3650 | log_fatal("Triple impossible condition at %s:%d.", MDL); | |
3651 | return NULL; | |
3652 | } | |
3653 | ||
3654 | /* Process a client-supplied IA_PD. This may append options to the tail of | |
3655 | * the reply packet being built in the reply_state structure. | |
3656 | */ | |
3657 | static isc_result_t | |
9322442f | 3658 | reply_process_ia_pd(struct reply_state *reply, struct option_cache *ia) { |
80c9fdb0 FD |
3659 | isc_result_t status = ISC_R_SUCCESS; |
3660 | u_int32_t iaid; | |
3661 | unsigned ia_cursor; | |
3662 | struct option_state *packet_ia; | |
3663 | struct option_cache *oc; | |
9322442f | 3664 | struct data_string ia_data, data; |
80c9fdb0 FD |
3665 | |
3666 | /* Initialize values that will get cleaned up on return. */ | |
3667 | packet_ia = NULL; | |
9322442f | 3668 | memset(&ia_data, 0, sizeof(ia_data)); |
80c9fdb0 | 3669 | memset(&data, 0, sizeof(data)); |
b31fe1d5 | 3670 | /* |
9322442f | 3671 | * Note that find_client_prefix() may set reply->lease. |
80c9fdb0 FD |
3672 | */ |
3673 | ||
3674 | /* Make sure there is at least room for the header. */ | |
3675 | if ((reply->cursor + IA_PD_OFFSET + 4) > sizeof(reply->buf)) { | |
3676 | log_error("reply_process_ia_pd: Reply too long for IA."); | |
3677 | return ISC_R_NOSPACE; | |
3678 | } | |
3679 | ||
3680 | ||
3681 | /* Fetch the IA_PD contents. */ | |
9322442f FD |
3682 | if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, |
3683 | ia, IA_PD_OFFSET)) { | |
3684 | log_error("reply_process_ia_pd: error evaluating ia"); | |
80c9fdb0 FD |
3685 | status = ISC_R_FAILURE; |
3686 | goto cleanup; | |
3687 | } | |
3688 | ||
3689 | /* Extract IA_PD header contents. */ | |
9322442f FD |
3690 | iaid = getULong(ia_data.data); |
3691 | reply->renew = getULong(ia_data.data + 4); | |
3692 | reply->rebind = getULong(ia_data.data + 8); | |
80c9fdb0 FD |
3693 | |
3694 | /* Create an IA_PD structure. */ | |
b31fe1d5 | 3695 | if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, |
9322442f FD |
3696 | reply->client_id.len, MDL) != ISC_R_SUCCESS) { |
3697 | log_error("reply_process_ia_pd: no memory for ia."); | |
80c9fdb0 FD |
3698 | status = ISC_R_NOMEMORY; |
3699 | goto cleanup; | |
3700 | } | |
9322442f | 3701 | reply->ia->ia_type = D6O_IA_PD; |
80c9fdb0 FD |
3702 | |
3703 | /* Cache pre-existing IA_PD, if any. */ | |
9322442f FD |
3704 | ia_hash_lookup(&reply->old_ia, ia_pd_active, |
3705 | (unsigned char *)reply->ia->iaid_duid.data, | |
3706 | reply->ia->iaid_duid.len, MDL); | |
80c9fdb0 FD |
3707 | |
3708 | /* | |
3709 | * Create an option cache to carry the IA_PD option contents, and | |
3710 | * execute any user-supplied values into it. | |
3711 | */ | |
3712 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
3713 | status = ISC_R_NOMEMORY; | |
3714 | goto cleanup; | |
3715 | } | |
3716 | ||
3717 | /* Check & count the fixed prefix host records. */ | |
3718 | reply->static_prefixes = 0; | |
3719 | if ((reply->host != NULL) && (reply->host->fixed_prefix != NULL)) { | |
3720 | struct iaddrcidrnetlist *fp; | |
3721 | ||
3722 | for (fp = reply->host->fixed_prefix; fp != NULL; | |
3723 | fp = fp->next) { | |
3724 | reply->static_prefixes += 1; | |
3725 | } | |
3726 | } | |
3727 | ||
3728 | /* | |
3729 | * Save the cursor position at the start of the IA_PD, so we can | |
3730 | * set length and adjust t1/t2 values later. We write a temporary | |
3731 | * header out now just in case we decide to adjust the packet | |
3732 | * within sub-process functions. | |
3733 | */ | |
3734 | ia_cursor = reply->cursor; | |
3735 | ||
3736 | /* Initialize the IA_PD header. First the code. */ | |
3737 | putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_PD); | |
3738 | reply->cursor += 2; | |
3739 | ||
3740 | /* Then option length. */ | |
3741 | putUShort(reply->buf.data + reply->cursor, 0x0Cu); | |
3742 | reply->cursor += 2; | |
3743 | ||
3744 | /* Then IA_PD header contents; IAID. */ | |
3745 | putULong(reply->buf.data + reply->cursor, iaid); | |
3746 | reply->cursor += 4; | |
3747 | ||
3748 | /* We store the client's t1 for now, and may over-ride it later. */ | |
3749 | putULong(reply->buf.data + reply->cursor, reply->renew); | |
3750 | reply->cursor += 4; | |
3751 | ||
3752 | /* We store the client's t2 for now, and may over-ride it later. */ | |
3753 | putULong(reply->buf.data + reply->cursor, reply->rebind); | |
3754 | reply->cursor += 4; | |
3755 | ||
b31fe1d5 | 3756 | /* |
80c9fdb0 FD |
3757 | * For each prefix in this IA_PD, decide what to do about it. |
3758 | */ | |
3759 | oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAPREFIX); | |
dce576b8 | 3760 | reply->min_valid = reply->min_prefer = 0xffffffff; |
80c9fdb0 FD |
3761 | reply->client_valid = reply->client_prefer = 0; |
3762 | reply->preflen = -1; | |
3763 | for (; oc != NULL ; oc = oc->next) { | |
3764 | status = reply_process_prefix(reply, oc); | |
3765 | ||
3766 | /* | |
3767 | * Canceled means we did not allocate prefixes to the | |
3768 | * client, but we're "done" with this IA - we set a status | |
3769 | * code. So transmit this reply, e.g., move on to the next | |
3770 | * IA. | |
3771 | */ | |
3772 | if (status == ISC_R_CANCELED) | |
3773 | break; | |
3774 | ||
d19fa5a1 SR |
3775 | if ((status != ISC_R_SUCCESS) && |
3776 | (status != ISC_R_ADDRINUSE) && | |
3777 | (status != ISC_R_ADDRNOTAVAIL)) | |
80c9fdb0 FD |
3778 | goto cleanup; |
3779 | } | |
3780 | ||
9322442f | 3781 | reply->pd_count++; |
80c9fdb0 FD |
3782 | |
3783 | /* | |
3784 | * If we fell through the above and never gave the client | |
3785 | * a prefix, give it one now. | |
3786 | */ | |
3787 | if ((status != ISC_R_CANCELED) && (reply->client_resources == 0)) { | |
3788 | status = find_client_prefix(reply); | |
3789 | ||
3790 | if (status == ISC_R_NORESOURCES) { | |
3791 | switch (reply->packet->dhcpv6_msg_type) { | |
3792 | case DHCPV6_SOLICIT: | |
3793 | /* | |
3794 | * No prefix for any IA is handled | |
3795 | * by the caller. | |
3796 | */ | |
3797 | /* FALL THROUGH */ | |
3798 | ||
3799 | case DHCPV6_REQUEST: | |
3800 | /* Same than for addresses. */ | |
3801 | option_state_dereference(&reply->reply_ia, MDL); | |
3802 | if (!option_state_allocate(&reply->reply_ia, | |
3803 | MDL)) | |
3804 | { | |
3805 | log_error("reply_process_ia_pd: No " | |
3806 | "memory for option state " | |
3807 | "wipe."); | |
3808 | status = ISC_R_NOMEMORY; | |
3809 | goto cleanup; | |
3810 | } | |
3811 | ||
3812 | if (!set_status_code(STATUS_NoPrefixAvail, | |
3813 | "No prefixes available " | |
3814 | "for this interface.", | |
3815 | reply->reply_ia)) { | |
3816 | log_error("reply_process_ia_pd: " | |
3817 | "Unable to set " | |
3818 | "NoPrefixAvail status " | |
3819 | "code."); | |
3820 | status = ISC_R_FAILURE; | |
3821 | goto cleanup; | |
3822 | } | |
3823 | ||
3824 | status = ISC_R_SUCCESS; | |
3825 | break; | |
3826 | ||
3827 | default: | |
9322442f | 3828 | if (reply->resources_included) |
80c9fdb0 FD |
3829 | status = ISC_R_SUCCESS; |
3830 | else | |
3831 | goto cleanup; | |
3832 | break; | |
3833 | } | |
3834 | } | |
3835 | ||
3836 | if (status != ISC_R_SUCCESS) | |
3837 | goto cleanup; | |
3838 | } | |
3839 | ||
3840 | reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, | |
3841 | sizeof(reply->buf) - reply->cursor, | |
3842 | reply->reply_ia, reply->packet, | |
3843 | required_opts_IA_PD, NULL); | |
3844 | ||
3845 | /* Reset the length of this IA_PD to match what was just written. */ | |
3846 | putUShort(reply->buf.data + ia_cursor + 2, | |
3847 | reply->cursor - (ia_cursor + 4)); | |
3848 | ||
dce576b8 TM |
3849 | /* Calculate T1/T2 and stuff them in the reply */ |
3850 | set_reply_tee_times(reply, ia_cursor); | |
80c9fdb0 | 3851 | |
d9b5c150 SR |
3852 | /* |
3853 | * yes, goto's aren't the best but we also want to avoid extra | |
3854 | * indents | |
3855 | */ | |
3856 | if (status == ISC_R_CANCELED) | |
3857 | goto cleanup; | |
3858 | ||
3859 | /* | |
3860 | * Handle static prefixes, we always log stuff and if it's | |
3861 | * a hard binding we run any commit statements that we have | |
3862 | */ | |
3863 | if (reply->static_prefixes != 0) { | |
3864 | char tmp_addr[INET6_ADDRSTRLEN]; | |
3865 | log_info("%s PD: address %s/%d to client with duid %s " | |
3866 | "iaid = %d static", | |
3867 | dhcpv6_type_names[reply->buf.reply.msg_type], | |
3868 | inet_ntop(AF_INET6, reply->fixed_pref.lo_addr.iabuf, | |
3869 | tmp_addr, sizeof(tmp_addr)), | |
3870 | reply->fixed_pref.bits, | |
3871 | print_hex_1(reply->client_id.len, | |
3872 | reply->client_id.data, 60), | |
3873 | iaid); | |
3874 | if ((reply->buf.reply.msg_type == DHCPV6_REPLY) && | |
3875 | (reply->on_star.on_commit != NULL)) { | |
3876 | execute_statements(NULL, reply->packet, NULL, NULL, | |
3877 | reply->packet->options, | |
3878 | reply->opt_state, | |
3879 | NULL, reply->on_star.on_commit, | |
3880 | NULL); | |
3881 | executable_statement_dereference | |
3882 | (&reply->on_star.on_commit, MDL); | |
3883 | } | |
3884 | goto cleanup; | |
3885 | } | |
3886 | ||
3887 | /* | |
3888 | * If we have any addresses log what we are doing. | |
3889 | */ | |
3890 | if (reply->ia->num_iasubopt != 0) { | |
3891 | struct iasubopt *tmp; | |
3892 | int i; | |
3893 | char tmp_addr[INET6_ADDRSTRLEN]; | |
3894 | ||
3895 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { | |
3896 | tmp = reply->ia->iasubopt[i]; | |
3897 | ||
3898 | log_info("%s PD: address %s/%d to client with duid %s" | |
36c4a037 | 3899 | " iaid = %d valid for %u seconds", |
d9b5c150 SR |
3900 | dhcpv6_type_names[reply->buf.reply.msg_type], |
3901 | inet_ntop(AF_INET6, &tmp->addr, | |
3902 | tmp_addr, sizeof(tmp_addr)), | |
3903 | (int)tmp->plen, | |
3904 | print_hex_1(reply->client_id.len, | |
3905 | reply->client_id.data, 60), | |
3906 | iaid, tmp->valid); | |
3907 | } | |
3908 | } | |
3909 | ||
80c9fdb0 FD |
3910 | /* |
3911 | * If this is not a 'soft' binding, consume the new changes into | |
3912 | * the database (if any have been attached to the ia_pd). | |
3913 | * | |
3914 | * Loop through the assigned dynamic prefixes, referencing the | |
3915 | * prefixes onto this IA_PD rather than any old ones, and updating | |
3916 | * prefix pool timers for each (if any). | |
3917 | */ | |
d9b5c150 | 3918 | if ((reply->buf.reply.msg_type == DHCPV6_REPLY) && |
1d17db44 FD |
3919 | (reply->ia->num_iasubopt != 0)) { |
3920 | struct iasubopt *tmp; | |
80c9fdb0 FD |
3921 | struct data_string *ia_id; |
3922 | int i; | |
3923 | ||
1d17db44 FD |
3924 | for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { |
3925 | tmp = reply->ia->iasubopt[i]; | |
80c9fdb0 | 3926 | |
9322442f FD |
3927 | if (tmp->ia != NULL) |
3928 | ia_dereference(&tmp->ia, MDL); | |
3929 | ia_reference(&tmp->ia, reply->ia, MDL); | |
80c9fdb0 | 3930 | |
5d89d60f | 3931 | /* Commit 'hard' bindings. */ |
9322442f FD |
3932 | renew_lease6(tmp->ipv6_pool, tmp); |
3933 | schedule_lease_timeout(tmp->ipv6_pool); | |
a7341359 SR |
3934 | |
3935 | /* If we have anything to do on commit do it now */ | |
3936 | if (tmp->on_star.on_commit != NULL) { | |
3937 | execute_statements(NULL, reply->packet, | |
b31fe1d5 | 3938 | NULL, NULL, |
a7341359 SR |
3939 | reply->packet->options, |
3940 | reply->opt_state, | |
58cb5d86 | 3941 | &tmp->scope, |
a7341359 SR |
3942 | tmp->on_star.on_commit, |
3943 | &tmp->on_star); | |
3944 | executable_statement_dereference | |
3945 | (&tmp->on_star.on_commit, MDL); | |
3946 | } | |
250f7134 SR |
3947 | |
3948 | /* Do our threshold check. */ | |
3949 | check_pool6_threshold(reply, tmp); | |
80c9fdb0 FD |
3950 | } |
3951 | ||
9322442f FD |
3952 | /* Remove any old ia from the hash. */ |
3953 | if (reply->old_ia != NULL) { | |
3954 | ia_id = &reply->old_ia->iaid_duid; | |
3955 | ia_hash_delete(ia_pd_active, | |
3956 | (unsigned char *)ia_id->data, | |
3957 | ia_id->len, MDL); | |
3958 | ia_dereference(&reply->old_ia, MDL); | |
80c9fdb0 FD |
3959 | } |
3960 | ||
9322442f | 3961 | /* Put new ia into the hash. */ |
1acab09f | 3962 | reply->ia->cltt = cur_time; |
9322442f FD |
3963 | ia_id = &reply->ia->iaid_duid; |
3964 | ia_hash_add(ia_pd_active, (unsigned char *)ia_id->data, | |
3965 | ia_id->len, reply->ia, MDL); | |
80c9fdb0 | 3966 | |
9322442f | 3967 | write_ia(reply->ia); |
ad80055f SR |
3968 | } else { |
3969 | schedule_lease_timeout_reply(reply); | |
80c9fdb0 FD |
3970 | } |
3971 | ||
3972 | cleanup: | |
3973 | if (packet_ia != NULL) | |
3974 | option_state_dereference(&packet_ia, MDL); | |
3975 | if (reply->reply_ia != NULL) | |
3976 | option_state_dereference(&reply->reply_ia, MDL); | |
9322442f FD |
3977 | if (ia_data.data != NULL) |
3978 | data_string_forget(&ia_data, MDL); | |
80c9fdb0 FD |
3979 | if (data.data != NULL) |
3980 | data_string_forget(&data, MDL); | |
9322442f FD |
3981 | if (reply->ia != NULL) |
3982 | ia_dereference(&reply->ia, MDL); | |
3983 | if (reply->old_ia != NULL) | |
3984 | ia_dereference(&reply->old_ia, MDL); | |
3985 | if (reply->lease != NULL) | |
1d17db44 | 3986 | iasubopt_dereference(&reply->lease, MDL); |
a7341359 SR |
3987 | if (reply->on_star.on_expiry != NULL) |
3988 | executable_statement_dereference | |
3989 | (&reply->on_star.on_expiry, MDL); | |
3990 | if (reply->on_star.on_release != NULL) | |
3991 | executable_statement_dereference | |
3992 | (&reply->on_star.on_release, MDL); | |
80c9fdb0 FD |
3993 | |
3994 | /* | |
3995 | * ISC_R_CANCELED is a status code used by the prefix processing to | |
3996 | * indicate we're replying with a status code. This is still a | |
3997 | * success at higher layers. | |
3998 | */ | |
3999 | return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); | |
4000 | } | |
4001 | ||
34711bb7 SR |
4002 | /*! |
4003 | * | |
4004 | * \brief Find the proper scoping group for use with a v6 static prefix. | |
4005 | * | |
4006 | * We start by trying to find a subnet based on the given prefix and | |
4007 | * the shared network. If we don't find one then the prefix has been | |
4008 | * declared outside of any subnets. If there is a static address | |
4009 | * associated with the host we use it to try and find a subnet (this | |
4010 | * should succeed). If there isn't a static address we fall back | |
4011 | * to the shared subnet itself. | |
4012 | * Once we have a subnet we extract the group from it and return it. | |
4013 | * | |
4014 | * \param reply - the reply structure we use to collect information | |
4015 | * we will use the fields shared, fixed_pref and host | |
4016 | * from the structure | |
4017 | * | |
4018 | * \return a pointer to the group structure to use for scoping | |
4019 | */ | |
4020 | ||
4021 | static struct group * | |
4022 | find_group_by_prefix(struct reply_state *reply) { | |
4023 | /* default group if we don't find anything better */ | |
4024 | struct group *group = reply->shared->group; | |
4025 | struct subnet *subnet = NULL; | |
4026 | struct iaddr tmp_addr; | |
4027 | struct data_string fixed_addr; | |
4028 | ||
4029 | /* Try with the prefix first */ | |
4030 | if (find_grouped_subnet(&subnet, reply->shared, | |
4031 | reply->fixed_pref.lo_addr, MDL) != 0) { | |
4032 | group = subnet->group; | |
4033 | subnet_dereference(&subnet, MDL); | |
4034 | return (group); | |
4035 | } | |
4036 | ||
4037 | /* Didn't find a subnet via prefix, what about fixed address */ | |
4038 | /* The caller has already tested reply->host != NULL */ | |
4039 | ||
4040 | memset(&fixed_addr, 0, sizeof(fixed_addr)); | |
4041 | ||
4042 | if ((reply->host->fixed_addr != NULL) && | |
4043 | (evaluate_option_cache(&fixed_addr, NULL, NULL, NULL, | |
4044 | NULL, NULL, &global_scope, | |
4045 | reply->host->fixed_addr, MDL))) { | |
4046 | if (fixed_addr.len >= 16) { | |
4047 | tmp_addr.len = 16; | |
4048 | memcpy(tmp_addr.iabuf, fixed_addr.data, 16); | |
4049 | if (find_grouped_subnet(&subnet, reply->shared, | |
4050 | tmp_addr, MDL) != 0) { | |
4051 | group = subnet->group; | |
4052 | subnet_dereference(&subnet, MDL); | |
4053 | } | |
4054 | } | |
4055 | data_string_forget(&fixed_addr, MDL); | |
4056 | } | |
4057 | ||
4058 | /* return whatever we got */ | |
4059 | return (group); | |
4060 | } | |
4061 | ||
80c9fdb0 FD |
4062 | /* |
4063 | * Process an IAPREFIX within a given IA_PD, storing any IAPREFIX reply | |
4064 | * contents into the reply's current ia_pd-scoped option cache. Returns | |
4065 | * ISC_R_CANCELED in the event we are replying with a status code and do | |
4066 | * not wish to process more IAPREFIXes within this IA_PD. | |
4067 | */ | |
4068 | static isc_result_t | |
4069 | reply_process_prefix(struct reply_state *reply, struct option_cache *pref) { | |
4070 | u_int32_t pref_life, valid_life; | |
4071 | struct binding_scope **scope; | |
80c9fdb0 FD |
4072 | struct iaddrcidrnet tmp_pref; |
4073 | struct option_cache *oc; | |
4074 | struct data_string iapref, data; | |
80c9fdb0 | 4075 | isc_result_t status = ISC_R_SUCCESS; |
01fa619f | 4076 | struct group *group; |
80c9fdb0 FD |
4077 | |
4078 | /* Initializes values that will be cleaned up. */ | |
80c9fdb0 FD |
4079 | memset(&iapref, 0, sizeof(iapref)); |
4080 | memset(&data, 0, sizeof(data)); | |
9322442f | 4081 | /* Note that reply->lease may be set by prefix_is_owned() */ |
80c9fdb0 FD |
4082 | |
4083 | /* | |
4084 | * There is no point trying to process an incoming prefix if there | |
4085 | * is no room for an outgoing prefix. | |
4086 | */ | |
4087 | if ((reply->cursor + 29) > sizeof(reply->buf)) { | |
4088 | log_error("reply_process_prefix: Out of room for prefix."); | |
4089 | return ISC_R_NOSPACE; | |
4090 | } | |
4091 | ||
4092 | /* Extract this IAPREFIX option. */ | |
b31fe1d5 | 4093 | if (!evaluate_option_cache(&iapref, reply->packet, NULL, NULL, |
80c9fdb0 FD |
4094 | reply->packet->options, NULL, &global_scope, |
4095 | pref, MDL) || | |
4096 | (iapref.len < IAPREFIX_OFFSET)) { | |
4097 | log_error("reply_process_prefix: error evaluating IAPREFIX."); | |
4098 | status = ISC_R_FAILURE; | |
4099 | goto cleanup; | |
4100 | } | |
4101 | ||
4102 | /* | |
4103 | * Layout: preferred and valid lifetimes followed by the prefix | |
4104 | * length and the IPv6 address. | |
4105 | */ | |
4106 | pref_life = getULong(iapref.data); | |
4107 | valid_life = getULong(iapref.data + 4); | |
4108 | ||
4109 | if ((reply->client_valid == 0) || | |
4110 | (reply->client_valid > valid_life)) | |
4111 | reply->client_valid = valid_life; | |
4112 | ||
4113 | if ((reply->client_prefer == 0) || | |
4114 | (reply->client_prefer > pref_life)) | |
4115 | reply->client_prefer = pref_life; | |
4116 | ||
b31fe1d5 | 4117 | /* |
80c9fdb0 FD |
4118 | * Clients may choose to send ::/0 as a prefix, with the idea to give |
4119 | * hints about preferred-lifetime or valid-lifetime. | |
4120 | */ | |
4121 | tmp_pref.lo_addr.len = 16; | |
4122 | memset(tmp_pref.lo_addr.iabuf, 0, 16); | |
4123 | if ((iapref.data[8] == 0) && | |
4124 | (memcmp(iapref.data + 9, tmp_pref.lo_addr.iabuf, 16) == 0)) { | |
4125 | /* Status remains success; we just ignore this one. */ | |
4126 | goto cleanup; | |
4127 | } | |
4128 | ||
4129 | /* | |
4130 | * Clients may choose to send ::/X as a prefix to specify a | |
4131 | * preferred/requested prefix length. Note X is never zero here. | |
4132 | */ | |
4133 | tmp_pref.bits = (int) iapref.data[8]; | |
4134 | if (reply->preflen < 0) { | |
4135 | /* Cache the first preferred prefix length. */ | |
4136 | reply->preflen = tmp_pref.bits; | |
4137 | } | |
4138 | if (memcmp(iapref.data + 9, tmp_pref.lo_addr.iabuf, 16) == 0) { | |
4139 | goto cleanup; | |
4140 | } | |
4141 | ||
4142 | memcpy(tmp_pref.lo_addr.iabuf, iapref.data + 9, 16); | |
4143 | ||
4144 | /* Verify the prefix belongs to the client. */ | |
4145 | if (!prefix_is_owned(reply, &tmp_pref)) { | |
4146 | /* Same than for addresses. */ | |
4147 | if ((reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) || | |
4148 | (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) || | |
4149 | (reply->packet->dhcpv6_msg_type == DHCPV6_REBIND)) { | |
4150 | status = reply_process_try_prefix(reply, &tmp_pref); | |
4151 | ||
4152 | /* Either error out or skip this prefix. */ | |
d19fa5a1 SR |
4153 | if ((status != ISC_R_SUCCESS) && |
4154 | (status != ISC_R_ADDRINUSE) && | |
4155 | (status != ISC_R_ADDRNOTAVAIL)) | |
80c9fdb0 FD |
4156 | goto cleanup; |
4157 | ||
9322442f | 4158 | if (reply->lease == NULL) { |
80c9fdb0 FD |
4159 | if (reply->packet->dhcpv6_msg_type == |
4160 | DHCPV6_REBIND) { | |
4161 | reply->send_prefer = 0; | |
4162 | reply->send_valid = 0; | |
4163 | goto send_pref; | |
4164 | } | |
4165 | ||
4166 | /* status remains success - ignore */ | |
4167 | goto cleanup; | |
4168 | } | |
80c9fdb0 FD |
4169 | /* |
4170 | * RFC3633 section 18.2.3: | |
4171 | * | |
4172 | * If the delegating router cannot find a binding | |
4173 | * for the requesting router's IA_PD the delegating | |
4174 | * router returns the IA_PD containing no prefixes | |
4175 | * with a Status Code option set to NoBinding in the | |
4176 | * Reply message. | |
4177 | * | |
4178 | * On mismatch we (ab)use this pretending we have not the IA | |
4179 | * as soon as we have not a prefix. | |
4180 | */ | |
4181 | } else if (reply->packet->dhcpv6_msg_type == DHCPV6_RENEW) { | |
4182 | /* Rewind the IA_PD to empty. */ | |
4183 | option_state_dereference(&reply->reply_ia, MDL); | |
4184 | if (!option_state_allocate(&reply->reply_ia, MDL)) { | |
4185 | log_error("reply_process_prefix: No memory " | |
4186 | "for option state wipe."); | |
4187 | status = ISC_R_NOMEMORY; | |
4188 | goto cleanup; | |
4189 | } | |
4190 | ||
4191 | /* Append a NoBinding status code. */ | |
4192 | if (!set_status_code(STATUS_NoBinding, | |
4193 | "Prefix not bound to this " | |
4194 | "interface.", reply->reply_ia)) { | |
4195 | log_error("reply_process_prefix: Unable to " | |
4196 | "attach status code."); | |
4197 | status = ISC_R_FAILURE; | |
4198 | goto cleanup; | |
4199 | } | |
4200 | ||
4201 | /* Fin (no more IAPREFIXes). */ | |
4202 | status = ISC_R_CANCELED; | |
4203 | goto cleanup; | |
4204 | } else { | |
4205 | log_error("It is impossible to lease a client that is " | |
4206 | "not sending a solicit, request, renew, or " | |
4207 | "rebind message."); | |
4208 | status = ISC_R_FAILURE; | |
4209 | goto cleanup; | |
4210 | } | |
4211 | } | |
4212 | ||
4213 | if (reply->static_prefixes > 0) { | |
4214 | if (reply->host == NULL) | |
4215 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4216 | ||
4217 | scope = &global_scope; | |
01fa619f | 4218 | |
34711bb7 | 4219 | /* Copy the static prefix for logging and finding the group */ |
d9b5c150 | 4220 | memcpy(&reply->fixed_pref, &tmp_pref, sizeof(tmp_pref)); |
34711bb7 SR |
4221 | |
4222 | /* Try to find a group for the static prefix */ | |
4223 | group = find_group_by_prefix(reply); | |
80c9fdb0 | 4224 | } else { |
9322442f | 4225 | if (reply->lease == NULL) |
80c9fdb0 FD |
4226 | log_fatal("Impossible condition at %s:%d.", MDL); |
4227 | ||
9322442f | 4228 | scope = &reply->lease->scope; |
01fa619f | 4229 | group = reply->lease->ipv6_pool->ipv6_pond->group; |
80c9fdb0 FD |
4230 | } |
4231 | ||
4232 | /* | |
4233 | * If client_resources is nonzero, then the reply_process_is_prefixed | |
4234 | * function has executed configuration state into the reply option | |
4235 | * cache. We will use that valid cache to derive configuration for | |
4236 | * whether or not to engage in additional prefixes, and similar. | |
4237 | */ | |
4238 | if (reply->client_resources != 0) { | |
4239 | unsigned limit = 1; | |
4240 | ||
4241 | /* | |
4242 | * Does this client have "enough" prefixes already? Default | |
4243 | * to one. Everybody gets one, and one should be enough for | |
4244 | * anybody. | |
4245 | */ | |
4246 | oc = lookup_option(&server_universe, reply->opt_state, | |
4247 | SV_LIMIT_PREFS_PER_IA); | |
4248 | if (oc != NULL) { | |
4249 | if (!evaluate_option_cache(&data, reply->packet, | |
4250 | NULL, NULL, | |
4251 | reply->packet->options, | |
4252 | reply->opt_state, | |
4253 | scope, oc, MDL) || | |
4254 | (data.len != 4)) { | |
4255 | log_error("reply_process_prefix: unable to " | |
4256 | "evaluate prefs-per-ia value."); | |
4257 | status = ISC_R_FAILURE; | |
4258 | goto cleanup; | |
4259 | } | |
4260 | ||
4261 | limit = getULong(data.data); | |
4262 | data_string_forget(&data, MDL); | |
4263 | } | |
4264 | ||
4265 | /* | |
4266 | * If we wish to limit the client to a certain number of | |
4267 | * prefixes, then omit the prefix from the reply. | |
4268 | */ | |
4269 | if (reply->client_resources >= limit) | |
4270 | goto cleanup; | |
4271 | } | |
4272 | ||
01fa619f | 4273 | status = reply_process_is_prefixed(reply, scope, group); |
80c9fdb0 FD |
4274 | if (status != ISC_R_SUCCESS) |
4275 | goto cleanup; | |
4276 | ||
4277 | send_pref: | |
4278 | status = reply_process_send_prefix(reply, &tmp_pref); | |
4279 | ||
4280 | cleanup: | |
4281 | if (iapref.data != NULL) | |
4282 | data_string_forget(&iapref, MDL); | |
4283 | if (data.data != NULL) | |
4284 | data_string_forget(&data, MDL); | |
9322442f | 4285 | if (reply->lease != NULL) |
1d17db44 | 4286 | iasubopt_dereference(&reply->lease, MDL); |
80c9fdb0 FD |
4287 | |
4288 | return status; | |
4289 | } | |
4290 | ||
4291 | /* | |
4292 | * Verify the prefix belongs to the client. If we've got a host | |
4293 | * record with fixed prefixes, it has to be an assigned prefix | |
4294 | * (fault out all else). Otherwise it's a dynamic prefix, so lookup | |
4295 | * that prefix and make sure it belongs to this DUID:IAID pair. | |
4296 | */ | |
4297 | static isc_boolean_t | |
4298 | prefix_is_owned(struct reply_state *reply, struct iaddrcidrnet *pref) { | |
4299 | struct iaddrcidrnetlist *l; | |
4300 | int i; | |
01fa619f | 4301 | struct ipv6_pond *pond; |
80c9fdb0 FD |
4302 | |
4303 | /* | |
4304 | * This faults out prefixes that don't match fixed prefixes. | |
4305 | */ | |
4306 | if (reply->static_prefixes > 0) { | |
4307 | for (l = reply->host->fixed_prefix; l != NULL; l = l->next) { | |
4308 | if ((pref->bits == l->cidrnet.bits) && | |
4309 | (memcmp(pref->lo_addr.iabuf, | |
4310 | l->cidrnet.lo_addr.iabuf, 16) == 0)) | |
bc7f8b8e | 4311 | return (ISC_TRUE); |
80c9fdb0 | 4312 | } |
bc7f8b8e | 4313 | return (ISC_FALSE); |
80c9fdb0 FD |
4314 | } |
4315 | ||
9322442f | 4316 | if ((reply->old_ia == NULL) || |
1d17db44 | 4317 | (reply->old_ia->num_iasubopt == 0)) |
bc7f8b8e | 4318 | return (ISC_FALSE); |
80c9fdb0 | 4319 | |
1d17db44 FD |
4320 | for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { |
4321 | struct iasubopt *tmp; | |
80c9fdb0 | 4322 | |
1d17db44 | 4323 | tmp = reply->old_ia->iasubopt[i]; |
80c9fdb0 FD |
4324 | |
4325 | if ((pref->bits == (int) tmp->plen) && | |
bc7f8b8e SR |
4326 | (memcmp(pref->lo_addr.iabuf, &tmp->addr, 16) == 0)) { |
4327 | if (lease6_usable(tmp) == ISC_FALSE) { | |
4328 | return (ISC_FALSE); | |
4329 | } | |
01fa619f SR |
4330 | |
4331 | pond = tmp->ipv6_pool->ipv6_pond; | |
4332 | if (((pond->prohibit_list != NULL) && | |
4333 | (permitted(reply->packet, pond->prohibit_list))) || | |
4334 | ((pond->permit_list != NULL) && | |
4335 | (!permitted(reply->packet, pond->permit_list)))) | |
4336 | return (ISC_FALSE); | |
4337 | ||
1d17db44 | 4338 | iasubopt_reference(&reply->lease, tmp, MDL); |
bc7f8b8e | 4339 | return (ISC_TRUE); |
80c9fdb0 FD |
4340 | } |
4341 | } | |
4342 | ||
bc7f8b8e | 4343 | return (ISC_FALSE); |
80c9fdb0 FD |
4344 | } |
4345 | ||
4346 | /* | |
4347 | * This function only returns failure on 'hard' failures. If it succeeds, | |
4348 | * it will leave a prefix structure behind. | |
4349 | */ | |
4350 | static isc_result_t | |
4351 | reply_process_try_prefix(struct reply_state *reply, | |
4352 | struct iaddrcidrnet *pref) { | |
d19fa5a1 | 4353 | isc_result_t status = ISC_R_ADDRNOTAVAIL; |
01fa619f SR |
4354 | struct ipv6_pool *pool = NULL; |
4355 | struct ipv6_pond *pond = NULL; | |
80c9fdb0 FD |
4356 | int i; |
4357 | struct data_string data_pref; | |
4358 | ||
bd72740e | 4359 | if ((reply == NULL) || (reply->shared == NULL) || |
d19fa5a1 SR |
4360 | (pref == NULL) || (reply->lease != NULL)) |
4361 | return (DHCP_R_INVALIDARG); | |
4362 | ||
01fa619f SR |
4363 | /* |
4364 | * Do a quick walk through of the ponds and pools | |
4365 | * to see if we have any prefix pools | |
4366 | */ | |
4367 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
4368 | if (pond->ipv6_pools == NULL) | |
4369 | continue; | |
4370 | ||
4371 | for (i = 0; (pool = pond->ipv6_pools[i]) != NULL; i++) { | |
4372 | if (pool->pool_type == D6O_IA_PD) | |
4373 | break; | |
4374 | } | |
4375 | if (pool != NULL) | |
4376 | break; | |
4377 | } | |
4378 | ||
4379 | /* If we get here and p is NULL we have no useful pools */ | |
4380 | if (pool == NULL) { | |
d19fa5a1 | 4381 | return (ISC_R_ADDRNOTAVAIL); |
01fa619f | 4382 | } |
80c9fdb0 FD |
4383 | |
4384 | memset(&data_pref, 0, sizeof(data_pref)); | |
4385 | data_pref.len = 17; | |
4386 | if (!buffer_allocate(&data_pref.buffer, data_pref.len, MDL)) { | |
4387 | log_error("reply_process_try_prefix: out of memory."); | |
d19fa5a1 | 4388 | return (ISC_R_NOMEMORY); |
80c9fdb0 FD |
4389 | } |
4390 | data_pref.data = data_pref.buffer->data; | |
4391 | data_pref.buffer->data[0] = (u_int8_t) pref->bits; | |
4392 | memcpy(data_pref.buffer->data + 1, pref->lo_addr.iabuf, 16); | |
4393 | ||
01fa619f SR |
4394 | /* |
4395 | * We have at least one pool that could provide a prefix | |
4396 | * Now we walk through the ponds and pools again and check | |
4397 | * to see if the client is permitted and if an prefix is | |
4398 | * available | |
b31fe1d5 | 4399 | * |
01fa619f SR |
4400 | */ |
4401 | ||
4402 | for (pond = reply->shared->ipv6_pond; pond != NULL; pond = pond->next) { | |
4403 | if (((pond->prohibit_list != NULL) && | |
4404 | (permitted(reply->packet, pond->prohibit_list))) || | |
4405 | ((pond->permit_list != NULL) && | |
4406 | (!permitted(reply->packet, pond->permit_list)))) | |
9322442f | 4407 | continue; |
01fa619f SR |
4408 | |
4409 | for (i = 0; (pool = pond->ipv6_pools[i]) != NULL; i++) { | |
4410 | if (pool->pool_type != D6O_IA_PD) { | |
4411 | continue; | |
4412 | } | |
4413 | ||
4414 | status = try_client_v6_prefix(&reply->lease, pool, | |
4415 | &data_pref); | |
b31fe1d5 | 4416 | /* If we found it in this pool (either in use or available), |
01fa619f SR |
4417 | there is no need to look further. */ |
4418 | if ( (status == ISC_R_SUCCESS) || (status == ISC_R_ADDRINUSE) ) | |
4419 | break; | |
4420 | } | |
c7aa4dd4 | 4421 | if ( (status == ISC_R_SUCCESS) || (status == ISC_R_ADDRINUSE) ) |
80c9fdb0 FD |
4422 | break; |
4423 | } | |
4424 | ||
4425 | data_string_forget(&data_pref, MDL); | |
4426 | /* Return just the most recent status... */ | |
d19fa5a1 | 4427 | return (status); |
80c9fdb0 FD |
4428 | } |
4429 | ||
4430 | /* Look around for a prefix to give the client. First, look through the old | |
4431 | * IA_PD for prefixes we can extend. Second, try to allocate a new prefix. | |
4432 | * Finally, actually add that prefix into the current reply IA_PD. | |
4433 | */ | |
4434 | static isc_result_t | |
4435 | find_client_prefix(struct reply_state *reply) { | |
4436 | struct iaddrcidrnet send_pref; | |
4437 | isc_result_t status = ISC_R_NORESOURCES; | |
1d17db44 | 4438 | struct iasubopt *prefix, *best_prefix = NULL; |
80c9fdb0 | 4439 | struct binding_scope **scope; |
80c9fdb0 | 4440 | int i; |
01fa619f | 4441 | struct group *group; |
80c9fdb0 | 4442 | |
80c9fdb0 FD |
4443 | if (reply->static_prefixes > 0) { |
4444 | struct iaddrcidrnetlist *l; | |
4445 | ||
4446 | if (reply->host == NULL) | |
98bf1607 | 4447 | return DHCP_R_INVALIDARG; |
80c9fdb0 FD |
4448 | |
4449 | for (l = reply->host->fixed_prefix; l != NULL; l = l->next) { | |
4450 | if (l->cidrnet.bits == reply->preflen) | |
4451 | break; | |
4452 | } | |
4453 | if (l == NULL) { | |
4454 | /* | |
4455 | * If no fixed prefix has the preferred length, | |
4456 | * get the first one. | |
4457 | */ | |
4458 | l = reply->host->fixed_prefix; | |
4459 | } | |
4460 | memcpy(&send_pref, &l->cidrnet, sizeof(send_pref)); | |
4461 | ||
80c9fdb0 | 4462 | scope = &global_scope; |
01fa619f | 4463 | |
d9b5c150 SR |
4464 | /* Copy the prefix for logging purposes */ |
4465 | memcpy(&reply->fixed_pref, &l->cidrnet, sizeof(send_pref)); | |
4466 | ||
34711bb7 SR |
4467 | /* Try to find a group for the static prefix */ |
4468 | group = find_group_by_prefix(reply); | |
4469 | ||
80c9fdb0 FD |
4470 | goto send_pref; |
4471 | } | |
4472 | ||
9322442f | 4473 | if (reply->old_ia != NULL) { |
1d17db44 | 4474 | for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { |
0d8c3d6e | 4475 | struct shared_network *candidate_shared; |
01fa619f | 4476 | struct ipv6_pond *pond; |
0d8c3d6e | 4477 | |
1d17db44 | 4478 | prefix = reply->old_ia->iasubopt[i]; |
0d8c3d6e | 4479 | candidate_shared = prefix->ipv6_pool->shared_network; |
01fa619f | 4480 | pond = prefix->ipv6_pool->ipv6_pond; |
80c9fdb0 | 4481 | |
0d8c3d6e DH |
4482 | /* |
4483 | * Consider this prefix if it is in a global pool or | |
4484 | * if it is scoped in a pool under the client's shared | |
4485 | * network. | |
4486 | */ | |
01fa619f SR |
4487 | if (((candidate_shared != NULL) && |
4488 | (candidate_shared != reply->shared)) || | |
4489 | (lease6_usable(prefix) != ISC_TRUE)) | |
4490 | continue; | |
4491 | ||
4492 | /* | |
4493 | * And check if the prefix is still permitted | |
4494 | */ | |
4495 | ||
4496 | if (((pond->prohibit_list != NULL) && | |
4497 | (permitted(reply->packet, pond->prohibit_list))) || | |
4498 | ((pond->permit_list != NULL) && | |
4499 | (!permitted(reply->packet, pond->permit_list)))) | |
4500 | continue; | |
4501 | ||
4502 | best_prefix = prefix_compare(reply, prefix, | |
4503 | best_prefix); | |
80c9fdb0 FD |
4504 | } |
4505 | } | |
4506 | ||
4507 | /* Try to pick a new prefix if we didn't find one, or if we found an | |
4508 | * abandoned prefix. | |
4509 | */ | |
4510 | if ((best_prefix == NULL) || (best_prefix->state == FTS_ABANDONED)) { | |
01fa619f | 4511 | status = pick_v6_prefix(reply); |
80c9fdb0 | 4512 | } else if (best_prefix != NULL) { |
1d17db44 | 4513 | iasubopt_reference(&reply->lease, best_prefix, MDL); |
80c9fdb0 FD |
4514 | status = ISC_R_SUCCESS; |
4515 | } | |
4516 | ||
4517 | /* Pick the abandoned prefix as a last resort. */ | |
4518 | if ((status == ISC_R_NORESOURCES) && (best_prefix != NULL)) { | |
4519 | /* I don't see how this is supposed to be done right now. */ | |
4520 | log_error("Reclaiming abandoned prefixes is not yet " | |
4521 | "supported. Treating this as an out of space " | |
4522 | "condition."); | |
1d17db44 | 4523 | /* iasubopt_reference(&reply->lease, best_prefix, MDL); */ |
80c9fdb0 FD |
4524 | } |
4525 | ||
4526 | /* Give up now if we didn't find a prefix. */ | |
4527 | if (status != ISC_R_SUCCESS) | |
5279b8f3 DH |
4528 | return status; |
4529 | ||
9322442f | 4530 | if (reply->lease == NULL) |
5279b8f3 DH |
4531 | log_fatal("Impossible condition at %s:%d.", MDL); |
4532 | ||
9322442f | 4533 | scope = &reply->lease->scope; |
01fa619f | 4534 | group = reply->lease->ipv6_pool->ipv6_pond->group; |
5279b8f3 | 4535 | |
80c9fdb0 | 4536 | send_pref.lo_addr.len = 16; |
9322442f FD |
4537 | memcpy(send_pref.lo_addr.iabuf, &reply->lease->addr, 16); |
4538 | send_pref.bits = (int) reply->lease->plen; | |
5279b8f3 | 4539 | |
80c9fdb0 | 4540 | send_pref: |
01fa619f | 4541 | status = reply_process_is_prefixed(reply, scope, group); |
5279b8f3 DH |
4542 | if (status != ISC_R_SUCCESS) |
4543 | return status; | |
4544 | ||
80c9fdb0 | 4545 | status = reply_process_send_prefix(reply, &send_pref); |
5279b8f3 DH |
4546 | return status; |
4547 | } | |
4548 | ||
80c9fdb0 FD |
4549 | /* Once a prefix is found for a client, perform several common functions; |
4550 | * Calculate and store valid and preferred prefix times, draw client options | |
5279b8f3 DH |
4551 | * into the option state. |
4552 | */ | |
4553 | static isc_result_t | |
9322442f | 4554 | reply_process_is_prefixed(struct reply_state *reply, |
80c9fdb0 | 4555 | struct binding_scope **scope, struct group *group) |
5279b8f3 DH |
4556 | { |
4557 | isc_result_t status = ISC_R_SUCCESS; | |
4558 | struct data_string data; | |
4559 | struct option_cache *oc; | |
a7341359 SR |
4560 | struct option_state *tmp_options = NULL; |
4561 | struct on_star *on_star; | |
01fa619f | 4562 | int i; |
5279b8f3 DH |
4563 | |
4564 | /* Initialize values we will cleanup. */ | |
4565 | memset(&data, 0, sizeof(data)); | |
4566 | ||
a7341359 SR |
4567 | /* |
4568 | * Find the proper on_star block to use. We use the | |
4569 | * one in the lease if we have a lease or the one in | |
4570 | * the reply if we don't have a lease because this is | |
4571 | * a static instance | |
4572 | */ | |
4573 | if (reply->lease) { | |
4574 | on_star = &reply->lease->on_star; | |
4575 | } else { | |
4576 | on_star = &reply->on_star; | |
4577 | } | |
4578 | ||
4579 | /* | |
4580 | * Bring in the root configuration. We only do this to bring | |
4581 | * in the on * statements, as we didn't have the lease available | |
4582 | * we we did it the first time. | |
4583 | */ | |
4584 | option_state_allocate(&tmp_options, MDL); | |
4585 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4586 | reply->packet->options, tmp_options, | |
4587 | &global_scope, root_group, NULL, | |
4588 | on_star); | |
4589 | if (tmp_options != NULL) { | |
4590 | option_state_dereference(&tmp_options, MDL); | |
4591 | } | |
4592 | ||
2267da84 DH |
4593 | /* |
4594 | * Bring configured options into the root packet level cache - start | |
4595 | * with the lease's closest enclosing group (passed in by the caller | |
4596 | * as 'group'). | |
4597 | */ | |
5279b8f3 DH |
4598 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, |
4599 | reply->packet->options, reply->opt_state, | |
a7341359 | 4600 | scope, group, root_group, on_star); |
5279b8f3 | 4601 | |
01fa619f SR |
4602 | /* Execute statements from class scopes. */ |
4603 | for (i = reply->packet->class_count; i > 0; i--) { | |
4604 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4605 | reply->packet->options, | |
4606 | reply->opt_state, scope, | |
4607 | reply->packet->classes[i - 1]->group, | |
4608 | group, on_star); | |
4609 | } | |
b31fe1d5 | 4610 | |
2267da84 DH |
4611 | /* |
4612 | * If there is a host record, over-ride with values configured there, | |
4613 | * without re-evaluating configuration from the previously executed | |
4614 | * group or its common enclosers. | |
4615 | */ | |
4616 | if (reply->host != NULL) | |
4617 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4618 | reply->packet->options, | |
4619 | reply->opt_state, scope, | |
a7341359 SR |
4620 | reply->host->group, group, |
4621 | on_star); | |
2267da84 | 4622 | |
5279b8f3 DH |
4623 | /* Determine valid lifetime. */ |
4624 | if (reply->client_valid == 0) | |
4625 | reply->send_valid = DEFAULT_DEFAULT_LEASE_TIME; | |
4626 | else | |
4627 | reply->send_valid = reply->client_valid; | |
4628 | ||
4629 | oc = lookup_option(&server_universe, reply->opt_state, | |
4630 | SV_DEFAULT_LEASE_TIME); | |
4631 | if (oc != NULL) { | |
b024480e | 4632 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, |
5279b8f3 DH |
4633 | reply->packet->options, |
4634 | reply->opt_state, | |
b024480e | 4635 | scope, oc, MDL) || |
5279b8f3 | 4636 | (data.len != 4)) { |
80c9fdb0 FD |
4637 | log_error("reply_process_is_prefixed: unable to " |
4638 | "evaluate default prefix time"); | |
5279b8f3 DH |
4639 | status = ISC_R_FAILURE; |
4640 | goto cleanup; | |
4641 | } | |
4642 | ||
4643 | reply->send_valid = getULong(data.data); | |
4644 | data_string_forget(&data, MDL); | |
98bd7ca0 | 4645 | } |
5279b8f3 | 4646 | |
36c4a037 SR |
4647 | /* Check to see if the lease time would cause us to wrap |
4648 | * in which case we make it infinite. | |
4649 | * The following doesn't work on at least some systems: | |
4650 | * (cur_time + reply->send_valid < cur_time) | |
4651 | */ | |
4652 | if (reply->send_valid != 0xFFFFFFFF) { | |
4653 | time_t test_time = cur_time + reply->send_valid; | |
4654 | if (test_time < cur_time) | |
4655 | reply->send_valid = 0xFFFFFFFF; | |
4656 | } | |
4657 | ||
5279b8f3 DH |
4658 | if (reply->client_prefer == 0) |
4659 | reply->send_prefer = reply->send_valid; | |
4660 | else | |
4661 | reply->send_prefer = reply->client_prefer; | |
4662 | ||
36c4a037 SR |
4663 | if ((reply->send_prefer >= reply->send_valid) && |
4664 | (reply->send_valid != 0xFFFFFFFF)) | |
5279b8f3 DH |
4665 | reply->send_prefer = (reply->send_valid / 2) + |
4666 | (reply->send_valid / 8); | |
4667 | ||
4668 | oc = lookup_option(&server_universe, reply->opt_state, | |
4669 | SV_PREFER_LIFETIME); | |
4670 | if (oc != NULL) { | |
b024480e | 4671 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, |
5279b8f3 DH |
4672 | reply->packet->options, |
4673 | reply->opt_state, | |
b024480e | 4674 | scope, oc, MDL) || |
5279b8f3 | 4675 | (data.len != 4)) { |
80c9fdb0 FD |
4676 | log_error("reply_process_is_prefixed: unable to " |
4677 | "evaluate preferred prefix time"); | |
5279b8f3 DH |
4678 | status = ISC_R_FAILURE; |
4679 | goto cleanup; | |
4680 | } | |
4681 | ||
4682 | reply->send_prefer = getULong(data.data); | |
4683 | data_string_forget(&data, MDL); | |
98bd7ca0 | 4684 | } |
5279b8f3 DH |
4685 | |
4686 | /* Note lowest values for later calculation of renew/rebind times. */ | |
dce576b8 TM |
4687 | if (reply->min_prefer > reply->send_prefer) |
4688 | reply->min_prefer = reply->send_prefer; | |
5279b8f3 | 4689 | |
dce576b8 TM |
4690 | if (reply->min_valid > reply->send_valid) |
4691 | reply->min_valid = reply->send_valid; | |
5279b8f3 | 4692 | |
80c9fdb0 | 4693 | /* Perform dynamic prefix related update work. */ |
9322442f | 4694 | if (reply->lease != NULL) { |
1acab09f FD |
4695 | /* Cached lifetimes */ |
4696 | reply->lease->prefer = reply->send_prefer; | |
4697 | reply->lease->valid = reply->send_valid; | |
4698 | ||
36c4a037 SR |
4699 | /* Advance (or rewind) the valid lifetime. |
4700 | * In the protocol 0xFFFFFFFF is infinite | |
4701 | * when connecting to the lease file MAX_TIME is | |
4702 | */ | |
5d89d60f | 4703 | if (reply->buf.reply.msg_type == DHCPV6_REPLY) { |
36c4a037 SR |
4704 | if (reply->send_valid == 0xFFFFFFFF) { |
4705 | reply->lease->soft_lifetime_end_time = MAX_TIME; | |
4706 | } else { | |
4707 | reply->lease->soft_lifetime_end_time = | |
4708 | cur_time + reply->send_valid; | |
4709 | } | |
5d89d60f FD |
4710 | /* Wait before renew! */ |
4711 | } | |
5279b8f3 | 4712 | |
1d17db44 | 4713 | status = ia_add_iasubopt(reply->ia, reply->lease, MDL); |
5279b8f3 | 4714 | if (status != ISC_R_SUCCESS) { |
80c9fdb0 FD |
4715 | log_fatal("reply_process_is_prefixed: Unable to " |
4716 | "attach prefix to new IA_PD: %s", | |
4717 | isc_result_totext(status)); | |
5279b8f3 DH |
4718 | } |
4719 | ||
4720 | /* | |
80c9fdb0 | 4721 | * If this is a new prefix, make sure it is attached somewhere. |
5279b8f3 | 4722 | */ |
9322442f FD |
4723 | if (reply->lease->ia == NULL) { |
4724 | ia_reference(&reply->lease->ia, reply->ia, MDL); | |
5279b8f3 | 4725 | } |
98bd7ca0 | 4726 | } |
5279b8f3 | 4727 | |
80c9fdb0 | 4728 | /* Bring a copy of the relevant options into the IA_PD scope. */ |
5279b8f3 DH |
4729 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, |
4730 | reply->packet->options, reply->reply_ia, | |
a7341359 | 4731 | scope, group, root_group, NULL); |
5279b8f3 | 4732 | |
01fa619f SR |
4733 | /* Execute statements from class scopes. */ |
4734 | for (i = reply->packet->class_count; i > 0; i--) { | |
4735 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4736 | reply->packet->options, | |
4737 | reply->reply_ia, scope, | |
4738 | reply->packet->classes[i - 1]->group, | |
4739 | group, NULL); | |
4740 | } | |
b31fe1d5 | 4741 | |
2267da84 DH |
4742 | /* |
4743 | * And bring in host record configuration, if any, but not to overlap | |
4744 | * the previous group or its common enclosers. | |
4745 | */ | |
4746 | if (reply->host != NULL) | |
4747 | execute_statements_in_scope(NULL, reply->packet, NULL, NULL, | |
4748 | reply->packet->options, | |
4749 | reply->reply_ia, scope, | |
a7341359 | 4750 | reply->host->group, group, NULL); |
2267da84 | 4751 | |
5279b8f3 DH |
4752 | cleanup: |
4753 | if (data.data != NULL) | |
4754 | data_string_forget(&data, MDL); | |
4755 | ||
4756 | if (status == ISC_R_SUCCESS) | |
1d9774ab | 4757 | reply->client_resources++; |
5279b8f3 DH |
4758 | |
4759 | return status; | |
4760 | } | |
4761 | ||
80c9fdb0 | 4762 | /* Simply send an IAPREFIX within the IA_PD scope as described. */ |
5279b8f3 | 4763 | static isc_result_t |
80c9fdb0 FD |
4764 | reply_process_send_prefix(struct reply_state *reply, |
4765 | struct iaddrcidrnet *pref) { | |
5279b8f3 DH |
4766 | isc_result_t status = ISC_R_SUCCESS; |
4767 | struct data_string data; | |
4768 | ||
4769 | memset(&data, 0, sizeof(data)); | |
4770 | ||
80c9fdb0 FD |
4771 | /* Now append the prefix. */ |
4772 | data.len = IAPREFIX_OFFSET; | |
5279b8f3 | 4773 | if (!buffer_allocate(&data.buffer, data.len, MDL)) { |
80c9fdb0 FD |
4774 | log_error("reply_process_send_prefix: out of memory" |
4775 | "allocating new IAPREFIX buffer."); | |
5279b8f3 DH |
4776 | status = ISC_R_NOMEMORY; |
4777 | goto cleanup; | |
98bd7ca0 | 4778 | } |
5279b8f3 DH |
4779 | data.data = data.buffer->data; |
4780 | ||
80c9fdb0 FD |
4781 | putULong(data.buffer->data, reply->send_prefer); |
4782 | putULong(data.buffer->data + 4, reply->send_valid); | |
4783 | data.buffer->data[8] = pref->bits; | |
4784 | memcpy(data.buffer->data + 9, pref->lo_addr.iabuf, 16); | |
5279b8f3 | 4785 | |
bead14ea DH |
4786 | if (!append_option_buffer(&dhcpv6_universe, reply->reply_ia, |
4787 | data.buffer, data.buffer->data, | |
80c9fdb0 FD |
4788 | data.len, D6O_IAPREFIX, 0)) { |
4789 | log_error("reply_process_send_prefix: unable " | |
4790 | "to save IAPREFIX option"); | |
5279b8f3 DH |
4791 | status = ISC_R_FAILURE; |
4792 | goto cleanup; | |
4793 | } | |
4794 | ||
9322442f | 4795 | reply->resources_included = ISC_TRUE; |
9f1d5a2f | 4796 | |
5279b8f3 DH |
4797 | cleanup: |
4798 | if (data.data != NULL) | |
4799 | data_string_forget(&data, MDL); | |
4800 | ||
4801 | return status; | |
4802 | } | |
4803 | ||
80c9fdb0 | 4804 | /* Choose the better of two prefixes. */ |
1d17db44 | 4805 | static struct iasubopt * |
80c9fdb0 | 4806 | prefix_compare(struct reply_state *reply, |
1d17db44 | 4807 | struct iasubopt *alpha, struct iasubopt *beta) { |
5279b8f3 DH |
4808 | if (alpha == NULL) |
4809 | return beta; | |
4810 | if (beta == NULL) | |
4811 | return alpha; | |
4812 | ||
80c9fdb0 FD |
4813 | if (reply->preflen >= 0) { |
4814 | if ((alpha->plen == reply->preflen) && | |
4815 | (beta->plen != reply->preflen)) | |
4816 | return alpha; | |
4817 | if ((beta->plen == reply->preflen) && | |
4818 | (alpha->plen != reply->preflen)) | |
4819 | return beta; | |
4820 | } | |
4821 | ||
5279b8f3 DH |
4822 | switch(alpha->state) { |
4823 | case FTS_ACTIVE: | |
4824 | switch(beta->state) { | |
4825 | case FTS_ACTIVE: | |
80c9fdb0 | 4826 | /* Choose the prefix with the longest lifetime (most |
5279b8f3 DH |
4827 | * likely the most recently allocated). |
4828 | */ | |
b31fe1d5 | 4829 | if (alpha->hard_lifetime_end_time < |
5d89d60f | 4830 | beta->hard_lifetime_end_time) |
5279b8f3 DH |
4831 | return beta; |
4832 | else | |
4833 | return alpha; | |
4834 | ||
4835 | case FTS_EXPIRED: | |
4836 | case FTS_ABANDONED: | |
4837 | return alpha; | |
4838 | ||
4839 | default: | |
4840 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4841 | } | |
4842 | break; | |
4843 | ||
4844 | case FTS_EXPIRED: | |
4845 | switch (beta->state) { | |
4846 | case FTS_ACTIVE: | |
4847 | return beta; | |
4848 | ||
4849 | case FTS_EXPIRED: | |
80c9fdb0 | 4850 | /* Choose the most recently expired prefix. */ |
5d89d60f FD |
4851 | if (alpha->hard_lifetime_end_time < |
4852 | beta->hard_lifetime_end_time) | |
4853 | return beta; | |
4854 | else if ((alpha->hard_lifetime_end_time == | |
4855 | beta->hard_lifetime_end_time) && | |
4856 | (alpha->soft_lifetime_end_time < | |
4857 | beta->soft_lifetime_end_time)) | |
5279b8f3 DH |
4858 | return beta; |
4859 | else | |
4860 | return alpha; | |
4861 | ||
4862 | case FTS_ABANDONED: | |
4863 | return alpha; | |
4864 | ||
4865 | default: | |
4866 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4867 | } | |
4868 | break; | |
4869 | ||
4870 | case FTS_ABANDONED: | |
4871 | switch (beta->state) { | |
4872 | case FTS_ACTIVE: | |
4873 | case FTS_EXPIRED: | |
4874 | return alpha; | |
4875 | ||
4876 | case FTS_ABANDONED: | |
80c9fdb0 | 4877 | /* Choose the prefix that was abandoned longest ago. */ |
5d89d60f FD |
4878 | if (alpha->hard_lifetime_end_time < |
4879 | beta->hard_lifetime_end_time) | |
5279b8f3 | 4880 | return alpha; |
a07d99bb TM |
4881 | else |
4882 | return beta; | |
5279b8f3 DH |
4883 | |
4884 | default: | |
4885 | log_fatal("Impossible condition at %s:%d.", MDL); | |
4886 | } | |
4887 | break; | |
4888 | ||
4889 | default: | |
4890 | log_fatal("Impossible condition at %s:%d.", MDL); | |
98bd7ca0 | 4891 | } |
5279b8f3 DH |
4892 | |
4893 | log_fatal("Triple impossible condition at %s:%d.", MDL); | |
4894 | return NULL; | |
98bd7ca0 DH |
4895 | } |
4896 | ||
4897 | /* | |
4898 | * Solicit is how a client starts requesting addresses. | |
4899 | * | |
b31fe1d5 | 4900 | * If the client asks for rapid commit, and we support it, we will |
98bd7ca0 DH |
4901 | * allocate the addresses and reply. |
4902 | * | |
4903 | * Otherwise we will send an advertise message. | |
4904 | */ | |
4905 | ||
98bd7ca0 DH |
4906 | static void |
4907 | dhcpv6_solicit(struct data_string *reply_ret, struct packet *packet) { | |
4908 | struct data_string client_id; | |
98bd7ca0 | 4909 | |
b31fe1d5 | 4910 | /* |
98bd7ca0 DH |
4911 | * Validate our input. |
4912 | */ | |
4913 | if (!valid_client_msg(packet, &client_id)) { | |
4914 | return; | |
4915 | } | |
4916 | ||
4917 | lease_to_client(reply_ret, packet, &client_id, NULL); | |
4918 | ||
4919 | /* | |
4920 | * Clean up. | |
4921 | */ | |
4922 | data_string_forget(&client_id, MDL); | |
4923 | } | |
4924 | ||
4925 | /* | |
4926 | * Request is how a client actually requests addresses. | |
4927 | * | |
4928 | * Very similar to Solicit handling, except the server DUID is required. | |
4929 | */ | |
4930 | ||
98bd7ca0 DH |
4931 | static void |
4932 | dhcpv6_request(struct data_string *reply_ret, struct packet *packet) { | |
4933 | struct data_string client_id; | |
4934 | struct data_string server_id; | |
4935 | ||
4936 | /* | |
4937 | * Validate our input. | |
4938 | */ | |
4939 | if (!valid_client_resp(packet, &client_id, &server_id)) { | |
4940 | return; | |
4941 | } | |
4942 | ||
b31fe1d5 TM |
4943 | /* If the REQUEST arrived via unicast and unicast option isn't set, |
4944 | * reject it per RFC 3315, Sec 18.2.1 */ | |
4945 | if (packet->unicast == ISC_TRUE && | |
4946 | is_unicast_option_defined(packet) == ISC_FALSE) { | |
4947 | unicast_reject(reply_ret, packet, &client_id, &server_id); | |
4948 | } else { | |
4949 | /* | |
4950 | * Issue our lease. | |
4951 | */ | |
4952 | lease_to_client(reply_ret, packet, &client_id, &server_id); | |
4953 | } | |
98bd7ca0 DH |
4954 | |
4955 | /* | |
4956 | * Cleanup. | |
4957 | */ | |
4958 | data_string_forget(&client_id, MDL); | |
4959 | data_string_forget(&server_id, MDL); | |
4960 | } | |
4961 | ||
8eab95f2 DH |
4962 | /* Find a DHCPv6 packet's shared network from hints in the packet. |
4963 | */ | |
bd72740e | 4964 | static isc_result_t |
8eab95f2 DH |
4965 | shared_network_from_packet6(struct shared_network **shared, |
4966 | struct packet *packet) | |
4967 | { | |
4968 | const struct packet *chk_packet; | |
4969 | const struct in6_addr *link_addr, *first_link_addr; | |
4970 | struct iaddr tmp_addr; | |
4971 | struct subnet *subnet; | |
bd72740e | 4972 | isc_result_t status; |
8eab95f2 | 4973 | |
bd72740e | 4974 | if ((shared == NULL) || (*shared != NULL) || (packet == NULL)) |
98bf1607 | 4975 | return DHCP_R_INVALIDARG; |
8eab95f2 DH |
4976 | |
4977 | /* | |
4978 | * First, find the link address where the packet from the client | |
4979 | * first appeared (if this packet was relayed). | |
4980 | */ | |
4981 | first_link_addr = NULL; | |
4982 | chk_packet = packet->dhcpv6_container_packet; | |
4983 | while (chk_packet != NULL) { | |
4984 | link_addr = &chk_packet->dhcpv6_link_address; | |
4985 | if (!IN6_IS_ADDR_UNSPECIFIED(link_addr) && | |
4986 | !IN6_IS_ADDR_LINKLOCAL(link_addr)) { | |
4987 | first_link_addr = link_addr; | |
b445a411 | 4988 | break; |
8eab95f2 DH |
4989 | } |
4990 | chk_packet = chk_packet->dhcpv6_container_packet; | |
4991 | } | |
4992 | ||
4993 | /* | |
4994 | * If there is a relayed link address, find the subnet associated | |
4995 | * with that, and use that to get the appropriate | |
4996 | * shared_network. | |
4997 | */ | |
4998 | if (first_link_addr != NULL) { | |
4999 | tmp_addr.len = sizeof(*first_link_addr); | |
5000 | memcpy(tmp_addr.iabuf, | |
5001 | first_link_addr, sizeof(*first_link_addr)); | |
5002 | subnet = NULL; | |
5003 | if (!find_subnet(&subnet, tmp_addr, MDL)) { | |
5004 | log_debug("No subnet found for link-address %s.", | |
5005 | piaddr(tmp_addr)); | |
bd72740e | 5006 | return ISC_R_NOTFOUND; |
8eab95f2 | 5007 | } |
bd72740e FD |
5008 | status = shared_network_reference(shared, |
5009 | subnet->shared_network, MDL); | |
8eab95f2 DH |
5010 | subnet_dereference(&subnet, MDL); |
5011 | ||
5012 | /* | |
5013 | * If there is no link address, we will use the interface | |
5014 | * that this packet came in on to pick the shared_network. | |
5015 | */ | |
4dc5a6b1 | 5016 | } else if (packet->interface != NULL) { |
bd72740e | 5017 | status = shared_network_reference(shared, |
8eab95f2 DH |
5018 | packet->interface->shared_network, |
5019 | MDL); | |
4dc5a6b1 SR |
5020 | if (packet->dhcpv6_container_packet != NULL) { |
5021 | log_info("[L2 Relay] No link address in relay packet " | |
5022 | "assuming L2 relay and using receiving " | |
5023 | "interface"); | |
5024 | } | |
5025 | ||
5026 | } else { | |
5027 | /* | |
5028 | * We shouldn't be able to get here but if there is no link | |
5029 | * address and no interface we don't know where to get the | |
5030 | * pool from log an error and return an error. | |
5031 | */ | |
b31fe1d5 | 5032 | log_error("No interface and no link address " |
4dc5a6b1 SR |
5033 | "can't determine pool"); |
5034 | status = DHCP_R_INVALIDARG; | |
8eab95f2 | 5035 | } |
bd72740e FD |
5036 | |
5037 | return status; | |
8eab95f2 DH |
5038 | } |
5039 | ||
98bd7ca0 | 5040 | /* |
b31fe1d5 | 5041 | * When a client thinks it might be on a new link, it sends a |
98bd7ca0 | 5042 | * Confirm message. |
8eab95f2 DH |
5043 | * |
5044 | * From RFC3315 section 18.2.2: | |
5045 | * | |
5046 | * When the server receives a Confirm message, the server determines | |
5047 | * whether the addresses in the Confirm message are appropriate for the | |
5048 | * link to which the client is attached. If all of the addresses in the | |
5049 | * Confirm message pass this test, the server returns a status of | |
5050 | * Success. If any of the addresses do not pass this test, the server | |
5051 | * returns a status of NotOnLink. If the server is unable to perform | |
5052 | * this test (for example, the server does not have information about | |
5053 | * prefixes on the link to which the client is connected), or there were | |
5054 | * no addresses in any of the IAs sent by the client, the server MUST | |
5055 | * NOT send a reply to the client. | |
98bd7ca0 DH |
5056 | */ |
5057 | ||
98bd7ca0 DH |
5058 | static void |
5059 | dhcpv6_confirm(struct data_string *reply_ret, struct packet *packet) { | |
8eab95f2 DH |
5060 | struct shared_network *shared; |
5061 | struct subnet *subnet; | |
5062 | struct option_cache *ia, *ta, *oc; | |
5063 | struct data_string cli_enc_opt_data, iaaddr, client_id, packet_oro; | |
5064 | struct option_state *cli_enc_opt_state, *opt_state; | |
5065 | struct iaddr cli_addr; | |
5066 | int pass; | |
5067 | isc_boolean_t inappropriate, has_addrs; | |
98bd7ca0 DH |
5068 | char reply_data[65536]; |
5069 | struct dhcpv6_packet *reply = (struct dhcpv6_packet *)reply_data; | |
a3528574 | 5070 | int reply_ofs = (int)(offsetof(struct dhcpv6_packet, options)); |
98bd7ca0 | 5071 | |
b31fe1d5 | 5072 | /* |
8eab95f2 | 5073 | * Basic client message validation. |
98bd7ca0 | 5074 | */ |
8eab95f2 | 5075 | memset(&client_id, 0, sizeof(client_id)); |
98bd7ca0 DH |
5076 | if (!valid_client_msg(packet, &client_id)) { |
5077 | return; | |
5078 | } | |
5079 | ||
80c9fdb0 FD |
5080 | /* |
5081 | * Do not process Confirms that do not have IA's we do not recognize. | |
8eab95f2 DH |
5082 | */ |
5083 | ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); | |
5084 | ta = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); | |
5085 | if ((ia == NULL) && (ta == NULL)) | |
5086 | return; | |
5087 | ||
80c9fdb0 FD |
5088 | /* |
5089 | * IA_PD's are simply ignored. | |
5090 | */ | |
5091 | delete_option(&dhcpv6_universe, packet->options, D6O_IA_PD); | |
5092 | ||
b31fe1d5 | 5093 | /* |
98bd7ca0 DH |
5094 | * Bit of variable initialization. |
5095 | */ | |
8eab95f2 DH |
5096 | opt_state = cli_enc_opt_state = NULL; |
5097 | memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); | |
98bd7ca0 | 5098 | memset(&iaaddr, 0, sizeof(iaaddr)); |
98bd7ca0 DH |
5099 | memset(&packet_oro, 0, sizeof(packet_oro)); |
5100 | ||
8eab95f2 DH |
5101 | /* Determine what shared network the client is connected to. We |
5102 | * must not respond if we don't have any information about the | |
5103 | * network the client is on. | |
98bd7ca0 | 5104 | */ |
8eab95f2 | 5105 | shared = NULL; |
bd72740e FD |
5106 | if ((shared_network_from_packet6(&shared, packet) != ISC_R_SUCCESS) || |
5107 | (shared == NULL)) | |
98bd7ca0 | 5108 | goto exit; |
98bd7ca0 | 5109 | |
8eab95f2 DH |
5110 | /* If there are no recorded subnets, then we have no |
5111 | * information about this subnet - ignore Confirms. | |
98bd7ca0 | 5112 | */ |
8eab95f2 DH |
5113 | subnet = shared->subnets; |
5114 | if (subnet == NULL) | |
5115 | goto exit; | |
98bd7ca0 | 5116 | |
8eab95f2 DH |
5117 | /* Are the addresses in all the IA's appropriate for that link? */ |
5118 | has_addrs = inappropriate = ISC_FALSE; | |
5119 | pass = D6O_IA_NA; | |
5120 | while(!inappropriate) { | |
5121 | /* If we've reached the end of the IA_NA pass, move to the | |
5122 | * IA_TA pass. | |
5123 | */ | |
5124 | if ((pass == D6O_IA_NA) && (ia == NULL)) { | |
5125 | pass = D6O_IA_TA; | |
5126 | ia = ta; | |
98bd7ca0 DH |
5127 | } |
5128 | ||
8eab95f2 DH |
5129 | /* If we've reached the end of all passes, we're done. */ |
5130 | if (ia == NULL) | |
5131 | break; | |
98bd7ca0 | 5132 | |
8eab95f2 DH |
5133 | if (((pass == D6O_IA_NA) && |
5134 | !get_encapsulated_IA_state(&cli_enc_opt_state, | |
5135 | &cli_enc_opt_data, | |
5136 | packet, ia, IA_NA_OFFSET)) || | |
5137 | ((pass == D6O_IA_TA) && | |
5138 | !get_encapsulated_IA_state(&cli_enc_opt_state, | |
5139 | &cli_enc_opt_data, | |
5140 | packet, ia, IA_TA_OFFSET))) { | |
98bd7ca0 DH |
5141 | goto exit; |
5142 | } | |
5143 | ||
8eab95f2 DH |
5144 | oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, |
5145 | D6O_IAADDR); | |
98bd7ca0 | 5146 | |
8eab95f2 DH |
5147 | for ( ; oc != NULL ; oc = oc->next) { |
5148 | if (!evaluate_option_cache(&iaaddr, packet, NULL, NULL, | |
5149 | packet->options, NULL, | |
5150 | &global_scope, oc, MDL) || | |
5279b8f3 | 5151 | (iaaddr.len < IAADDR_OFFSET)) { |
8eab95f2 DH |
5152 | log_error("dhcpv6_confirm: " |
5153 | "error evaluating IAADDR."); | |
98bd7ca0 DH |
5154 | goto exit; |
5155 | } | |
8eab95f2 DH |
5156 | |
5157 | /* Copy out the IPv6 address for processing. */ | |
5158 | cli_addr.len = 16; | |
5159 | memcpy(cli_addr.iabuf, iaaddr.data, 16); | |
5160 | ||
5279b8f3 DH |
5161 | data_string_forget(&iaaddr, MDL); |
5162 | ||
8eab95f2 DH |
5163 | /* Record that we've processed at least one address. */ |
5164 | has_addrs = ISC_TRUE; | |
5165 | ||
5166 | /* Find out if any subnets cover this address. */ | |
5167 | for (subnet = shared->subnets ; subnet != NULL ; | |
5168 | subnet = subnet->next_sibling) { | |
5169 | if (addr_eq(subnet_number(cli_addr, | |
5170 | subnet->netmask), | |
5171 | subnet->net)) | |
5172 | break; | |
5173 | } | |
5174 | ||
8eab95f2 DH |
5175 | /* If we reach the end of the subnet list, and no |
5176 | * subnet matches the client address, then it must | |
5177 | * be inappropriate to the link (so far as our | |
5178 | * configuration says). Once we've found one | |
5179 | * inappropriate address, there is no reason to | |
5180 | * continue searching. | |
5181 | */ | |
5182 | if (subnet == NULL) { | |
5183 | inappropriate = ISC_TRUE; | |
98bd7ca0 DH |
5184 | break; |
5185 | } | |
5279b8f3 | 5186 | } |
98bd7ca0 | 5187 | |
8eab95f2 DH |
5188 | option_state_dereference(&cli_enc_opt_state, MDL); |
5189 | data_string_forget(&cli_enc_opt_data, MDL); | |
98bd7ca0 | 5190 | |
8eab95f2 DH |
5191 | /* Advance to the next IA_*. */ |
5192 | ia = ia->next; | |
98bd7ca0 DH |
5193 | } |
5194 | ||
8eab95f2 DH |
5195 | /* If the client supplied no addresses, do not reply. */ |
5196 | if (!has_addrs) | |
5197 | goto exit; | |
5198 | ||
b31fe1d5 | 5199 | /* |
8eab95f2 | 5200 | * Set up reply. |
98bd7ca0 | 5201 | */ |
8eab95f2 | 5202 | if (!start_reply(packet, &client_id, NULL, &opt_state, reply)) { |
98bd7ca0 DH |
5203 | goto exit; |
5204 | } | |
5205 | ||
b31fe1d5 | 5206 | /* |
98bd7ca0 DH |
5207 | * Set our status. |
5208 | */ | |
8eab95f2 | 5209 | if (inappropriate) { |
b31fe1d5 | 5210 | if (!set_status_code(STATUS_NotOnLink, |
98bd7ca0 DH |
5211 | "Some of the addresses are not on link.", |
5212 | opt_state)) { | |
5213 | goto exit; | |
5214 | } | |
5215 | } else { | |
b31fe1d5 | 5216 | if (!set_status_code(STATUS_Success, |
98bd7ca0 DH |
5217 | "All addresses still on link.", |
5218 | opt_state)) { | |
5219 | goto exit; | |
5220 | } | |
5221 | } | |
5222 | ||
b31fe1d5 | 5223 | /* |
98bd7ca0 DH |
5224 | * Only one option: add it. |
5225 | */ | |
5226 | reply_ofs += store_options6(reply_data+reply_ofs, | |
b31fe1d5 | 5227 | sizeof(reply_data)-reply_ofs, |
98bd7ca0 DH |
5228 | opt_state, packet, |
5229 | required_opts, &packet_oro); | |
5230 | ||
b31fe1d5 | 5231 | /* |
98bd7ca0 DH |
5232 | * Return our reply to the caller. |
5233 | */ | |
5234 | reply_ret->len = reply_ofs; | |
5235 | reply_ret->buffer = NULL; | |
5236 | if (!buffer_allocate(&reply_ret->buffer, reply_ofs, MDL)) { | |
5237 | log_fatal("No memory to store reply."); | |
5238 | } | |
5239 | reply_ret->data = reply_ret->buffer->data; | |
5240 | memcpy(reply_ret->buffer->data, reply, reply_ofs); | |
5241 | ||
5242 | exit: | |
8eab95f2 DH |
5243 | /* Cleanup any stale data strings. */ |
5244 | if (cli_enc_opt_data.buffer != NULL) | |
5245 | data_string_forget(&cli_enc_opt_data, MDL); | |
5246 | if (iaaddr.buffer != NULL) | |
98bd7ca0 | 5247 | data_string_forget(&iaaddr, MDL); |
8eab95f2 DH |
5248 | if (client_id.buffer != NULL) |
5249 | data_string_forget(&client_id, MDL); | |
5250 | if (packet_oro.buffer != NULL) | |
5251 | data_string_forget(&packet_oro, MDL); | |
5252 | ||
5253 | /* Release any stale option states. */ | |
5254 | if (cli_enc_opt_state != NULL) | |
5255 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5256 | if (opt_state != NULL) | |
5257 | option_state_dereference(&opt_state, MDL); | |
98bd7ca0 DH |
5258 | } |
5259 | ||
5260 | /* | |
80c9fdb0 | 5261 | * Renew is when a client wants to extend its lease/prefix, at time T1. |
98bd7ca0 | 5262 | * |
80c9fdb0 FD |
5263 | * We handle this the same as if the client wants a new lease/prefix, |
5264 | * except for the error code of when addresses don't match. | |
98bd7ca0 DH |
5265 | */ |
5266 | ||
98bd7ca0 DH |
5267 | static void |
5268 | dhcpv6_renew(struct data_string *reply, struct packet *packet) { | |
5269 | struct data_string client_id; | |
5270 | struct data_string server_id; | |
5271 | ||
b31fe1d5 | 5272 | /* |
98bd7ca0 DH |
5273 | * Validate the request. |
5274 | */ | |
5275 | if (!valid_client_resp(packet, &client_id, &server_id)) { | |
5276 | return; | |
5277 | } | |
5278 | ||
b31fe1d5 TM |
5279 | /* If the RENEW arrived via unicast and unicast option isn't set, |
5280 | * reject it per RFC 3315, Sec 18.2.3 */ | |
5281 | if (packet->unicast == ISC_TRUE && | |
5282 | is_unicast_option_defined(packet) == ISC_FALSE) { | |
5283 | unicast_reject(reply, packet, &client_id, &server_id); | |
5284 | } else { | |
5285 | /* | |
5286 | * Renew our lease. | |
5287 | */ | |
5288 | lease_to_client(reply, packet, &client_id, &server_id); | |
5289 | } | |
98bd7ca0 DH |
5290 | |
5291 | /* | |
5292 | * Cleanup. | |
5293 | */ | |
5294 | data_string_forget(&server_id, MDL); | |
5295 | data_string_forget(&client_id, MDL); | |
5296 | } | |
5297 | ||
5298 | /* | |
5299 | * Rebind is when a client wants to extend its lease, at time T2. | |
5300 | * | |
5301 | * We handle this the same as if the client wants a new lease, except | |
5302 | * for the error code of when addresses don't match. | |
5303 | */ | |
5304 | ||
98bd7ca0 DH |
5305 | static void |
5306 | dhcpv6_rebind(struct data_string *reply, struct packet *packet) { | |
5307 | struct data_string client_id; | |
5308 | ||
5309 | if (!valid_client_msg(packet, &client_id)) { | |
5310 | return; | |
5311 | } | |
5312 | ||
5279b8f3 | 5313 | lease_to_client(reply, packet, &client_id, NULL); |
98bd7ca0 DH |
5314 | |
5315 | data_string_forget(&client_id, MDL); | |
5316 | } | |
5317 | ||
5318 | static void | |
5319 | ia_na_match_decline(const struct data_string *client_id, | |
5320 | const struct data_string *iaaddr, | |
1d17db44 | 5321 | struct iasubopt *lease) |
c382bc98 | 5322 | { |
98bd7ca0 DH |
5323 | char tmp_addr[INET6_ADDRSTRLEN]; |
5324 | ||
5325 | log_error("Client %s reports address %s is " | |
5326 | "already in use by another host!", | |
5327 | print_hex_1(client_id->len, client_id->data, 60), | |
b31fe1d5 | 5328 | inet_ntop(AF_INET6, iaaddr->data, |
98bd7ca0 DH |
5329 | tmp_addr, sizeof(tmp_addr))); |
5330 | if (lease != NULL) { | |
5331 | decline_lease6(lease->ipv6_pool, lease); | |
1acab09f | 5332 | lease->ia->cltt = cur_time; |
9322442f | 5333 | write_ia(lease->ia); |
98bd7ca0 DH |
5334 | } |
5335 | } | |
5336 | ||
5337 | static void | |
5338 | ia_na_nomatch_decline(const struct data_string *client_id, | |
5339 | const struct data_string *iaaddr, | |
5340 | u_int32_t *ia_na_id, | |
5341 | struct packet *packet, | |
5342 | char *reply_data, | |
5343 | int *reply_ofs, | |
c382bc98 SK |
5344 | int reply_len) |
5345 | { | |
98bd7ca0 DH |
5346 | char tmp_addr[INET6_ADDRSTRLEN]; |
5347 | struct option_state *host_opt_state; | |
5348 | int len; | |
5349 | ||
5350 | log_info("Client %s declines address %s, which is not offered to it.", | |
5351 | print_hex_1(client_id->len, client_id->data, 60), | |
5352 | inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); | |
5353 | ||
5354 | /* | |
5355 | * Create state for this IA_NA. | |
5356 | */ | |
5357 | host_opt_state = NULL; | |
5358 | if (!option_state_allocate(&host_opt_state, MDL)) { | |
5359 | log_error("ia_na_nomatch_decline: out of memory " | |
5360 | "allocating option_state."); | |
5361 | goto exit; | |
5362 | } | |
5363 | ||
5364 | if (!set_status_code(STATUS_NoBinding, "Decline for unknown address.", | |
5365 | host_opt_state)) { | |
5366 | goto exit; | |
5367 | } | |
5368 | ||
5369 | /* | |
5370 | * Insure we have enough space | |
5371 | */ | |
5372 | if (reply_len < (*reply_ofs + 16)) { | |
5373 | log_error("ia_na_nomatch_decline: " | |
5374 | "out of space for reply packet."); | |
5375 | goto exit; | |
5376 | } | |
5377 | ||
5378 | /* | |
5379 | * Put our status code into the reply packet. | |
5380 | */ | |
5381 | len = store_options6(reply_data+(*reply_ofs)+16, | |
5382 | reply_len-(*reply_ofs)-16, | |
5383 | host_opt_state, packet, | |
5384 | required_opts_STATUS_CODE, NULL); | |
5385 | ||
5386 | /* | |
b31fe1d5 TM |
5387 | * Store the non-encapsulated option data for this |
5388 | * IA_NA into our reply packet. Defined in RFC 3315, | |
5389 | * section 22.4. | |
98bd7ca0 DH |
5390 | */ |
5391 | /* option number */ | |
28868515 | 5392 | putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_NA); |
98bd7ca0 | 5393 | /* option length */ |
28868515 | 5394 | putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); |
98bd7ca0 DH |
5395 | /* IA_NA, copied from the client */ |
5396 | memcpy(reply_data+(*reply_ofs)+4, ia_na_id, 4); | |
5397 | /* t1 and t2, odd that we need them, but here it is */ | |
28868515 SK |
5398 | putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); |
5399 | putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); | |
98bd7ca0 DH |
5400 | |
5401 | /* | |
5402 | * Get ready for next IA_NA. | |
5403 | */ | |
5404 | *reply_ofs += (len + 16); | |
5405 | ||
5406 | exit: | |
5407 | option_state_dereference(&host_opt_state, MDL); | |
5408 | } | |
5409 | ||
5410 | static void | |
b31fe1d5 | 5411 | iterate_over_ia_na(struct data_string *reply_ret, |
98bd7ca0 DH |
5412 | struct packet *packet, |
5413 | const struct data_string *client_id, | |
5414 | const struct data_string *server_id, | |
06eb8bab | 5415 | const char *packet_type, |
98bd7ca0 | 5416 | void (*ia_na_match)(), |
c382bc98 SK |
5417 | void (*ia_na_nomatch)()) |
5418 | { | |
98bd7ca0 DH |
5419 | struct option_state *opt_state; |
5420 | struct host_decl *packet_host; | |
5421 | struct option_cache *ia; | |
5422 | struct option_cache *oc; | |
5423 | /* cli_enc_... variables come from the IA_NA/IA_TA options */ | |
5424 | struct data_string cli_enc_opt_data; | |
5425 | struct option_state *cli_enc_opt_state; | |
5426 | struct host_decl *host; | |
5427 | struct option_state *host_opt_state; | |
98bd7ca0 DH |
5428 | struct data_string iaaddr; |
5429 | struct data_string fixed_addr; | |
98bd7ca0 DH |
5430 | char reply_data[65536]; |
5431 | struct dhcpv6_packet *reply = (struct dhcpv6_packet *)reply_data; | |
a3528574 | 5432 | int reply_ofs = (int)(offsetof(struct dhcpv6_packet, options)); |
98bd7ca0 | 5433 | char status_msg[32]; |
1d17db44 | 5434 | struct iasubopt *lease; |
9322442f | 5435 | struct ia_xx *existing_ia_na; |
98bd7ca0 DH |
5436 | int i; |
5437 | struct data_string key; | |
5438 | u_int32_t iaid; | |
5439 | ||
5440 | /* | |
5441 | * Initialize to empty values, in case we have to exit early. | |
5442 | */ | |
5443 | opt_state = NULL; | |
5444 | memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); | |
5445 | cli_enc_opt_state = NULL; | |
5446 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
5447 | memset(&fixed_addr, 0, sizeof(fixed_addr)); | |
5448 | host_opt_state = NULL; | |
5449 | lease = NULL; | |
5450 | ||
b31fe1d5 | 5451 | /* |
98bd7ca0 DH |
5452 | * Find the host record that matches from the packet, if any. |
5453 | */ | |
5454 | packet_host = NULL; | |
62a9eb91 | 5455 | find_hosts6(&packet_host, packet, client_id, MDL); |
98bd7ca0 | 5456 | |
b31fe1d5 | 5457 | /* |
98bd7ca0 DH |
5458 | * Set our reply information. |
5459 | */ | |
5460 | reply->msg_type = DHCPV6_REPLY; | |
b31fe1d5 | 5461 | memcpy(reply->transaction_id, packet->dhcpv6_transaction_id, |
98bd7ca0 DH |
5462 | sizeof(reply->transaction_id)); |
5463 | ||
5464 | /* | |
5465 | * Build our option state for reply. | |
5466 | */ | |
5467 | opt_state = NULL; | |
5468 | if (!option_state_allocate(&opt_state, MDL)) { | |
5469 | log_error("iterate_over_ia_na: no memory for option_state."); | |
5470 | goto exit; | |
5471 | } | |
b31fe1d5 TM |
5472 | execute_statements_in_scope(NULL, packet, NULL, NULL, |
5473 | packet->options, opt_state, | |
a7341359 | 5474 | &global_scope, root_group, NULL, NULL); |
98bd7ca0 | 5475 | |
b31fe1d5 | 5476 | /* |
98bd7ca0 DH |
5477 | * RFC 3315, section 18.2.7 tells us which options to include. |
5478 | */ | |
5479 | oc = lookup_option(&dhcpv6_universe, opt_state, D6O_SERVERID); | |
5480 | if (oc == NULL) { | |
b31fe1d5 TM |
5481 | if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, |
5482 | (unsigned char *)server_duid.data, | |
98bd7ca0 DH |
5483 | server_duid.len, D6O_SERVERID, 0)) { |
5484 | log_error("iterate_over_ia_na: " | |
5485 | "error saving server identifier."); | |
5486 | goto exit; | |
5487 | } | |
5488 | } | |
5489 | ||
b31fe1d5 TM |
5490 | if (!save_option_buffer(&dhcpv6_universe, opt_state, |
5491 | client_id->buffer, | |
98bd7ca0 | 5492 | (unsigned char *)client_id->data, |
b31fe1d5 | 5493 | client_id->len, |
98bd7ca0 DH |
5494 | D6O_CLIENTID, 0)) { |
5495 | log_error("iterate_over_ia_na: " | |
5496 | "error saving client identifier."); | |
5497 | goto exit; | |
5498 | } | |
5499 | ||
5500 | snprintf(status_msg, sizeof(status_msg), "%s received.", packet_type); | |
5501 | if (!set_status_code(STATUS_Success, status_msg, opt_state)) { | |
5502 | goto exit; | |
5503 | } | |
5504 | ||
b31fe1d5 TM |
5505 | /* |
5506 | * Add our options that are not associated with any IA_NA or IA_TA. | |
98bd7ca0 DH |
5507 | */ |
5508 | reply_ofs += store_options6(reply_data+reply_ofs, | |
b31fe1d5 | 5509 | sizeof(reply_data)-reply_ofs, |
98bd7ca0 DH |
5510 | opt_state, packet, |
5511 | required_opts, NULL); | |
5512 | ||
5513 | /* | |
5514 | * Loop through the IA_NA reported by the client, and deal with | |
5515 | * addresses reported as already in use. | |
5516 | */ | |
5517 | for (ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); | |
5518 | ia != NULL; ia = ia->next) { | |
98bd7ca0 DH |
5519 | |
5520 | if (!get_encapsulated_IA_state(&cli_enc_opt_state, | |
5521 | &cli_enc_opt_data, | |
8eab95f2 | 5522 | packet, ia, IA_NA_OFFSET)) { |
98bd7ca0 DH |
5523 | goto exit; |
5524 | } | |
5525 | ||
5526 | iaid = getULong(cli_enc_opt_data.data); | |
5527 | ||
b31fe1d5 | 5528 | /* |
98bd7ca0 | 5529 | * XXX: It is possible that we can get multiple addresses |
b31fe1d5 TM |
5530 | * sent by the client. We don't send multiple |
5531 | * addresses, so this indicates a client error. | |
98bd7ca0 DH |
5532 | * We should check for multiple IAADDR options, log |
5533 | * if found, and set as an error. | |
5534 | */ | |
b31fe1d5 | 5535 | oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, |
98bd7ca0 DH |
5536 | D6O_IAADDR); |
5537 | if (oc == NULL) { | |
5538 | /* no address given for this IA, ignore */ | |
5539 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5540 | data_string_forget(&cli_enc_opt_data, MDL); | |
5541 | continue; | |
5542 | } | |
5543 | ||
5544 | memset(&iaaddr, 0, sizeof(iaaddr)); | |
b31fe1d5 | 5545 | if (!evaluate_option_cache(&iaaddr, packet, NULL, NULL, |
98bd7ca0 DH |
5546 | packet->options, NULL, |
5547 | &global_scope, oc, MDL)) { | |
5548 | log_error("iterate_over_ia_na: " | |
5549 | "error evaluating IAADDR."); | |
5550 | goto exit; | |
5551 | } | |
5552 | ||
b31fe1d5 | 5553 | /* |
98bd7ca0 | 5554 | * Now we need to figure out which host record matches |
c900c5b2 DH |
5555 | * this IA_NA and IAADDR (encapsulated option contents |
5556 | * matching a host record by option). | |
98bd7ca0 DH |
5557 | * |
5558 | * XXX: We don't currently track IA_NA separately, but | |
5559 | * we will need to do this! | |
5560 | */ | |
5561 | host = NULL; | |
b31fe1d5 TM |
5562 | if (!find_hosts_by_option(&host, packet, |
5563 | cli_enc_opt_state, MDL)) { | |
98bd7ca0 DH |
5564 | if (packet_host != NULL) { |
5565 | host = packet_host; | |
5566 | } else { | |
5567 | host = NULL; | |
5568 | } | |
5569 | } | |
5570 | while (host != NULL) { | |
5571 | if (host->fixed_addr != NULL) { | |
b31fe1d5 TM |
5572 | if (!evaluate_option_cache(&fixed_addr, NULL, |
5573 | NULL, NULL, NULL, | |
98bd7ca0 | 5574 | NULL, &global_scope, |
b31fe1d5 | 5575 | host->fixed_addr, |
98bd7ca0 DH |
5576 | MDL)) { |
5577 | log_error("iterate_over_ia_na: error " | |
5578 | "evaluating host address."); | |
5579 | goto exit; | |
5580 | } | |
5581 | if ((iaaddr.len >= 16) && | |
5582 | !memcmp(fixed_addr.data, iaaddr.data, 16)) { | |
5583 | data_string_forget(&fixed_addr, MDL); | |
5584 | break; | |
5585 | } | |
5586 | data_string_forget(&fixed_addr, MDL); | |
5587 | } | |
5588 | host = host->n_ipaddr; | |
5589 | } | |
5590 | ||
5279b8f3 | 5591 | if ((host == NULL) && (iaaddr.len >= IAADDR_OFFSET)) { |
98bd7ca0 DH |
5592 | /* |
5593 | * Find existing IA_NA. | |
5594 | */ | |
b31fe1d5 | 5595 | if (ia_make_key(&key, iaid, |
1d9774ab | 5596 | (char *)client_id->data, |
b31fe1d5 | 5597 | client_id->len, |
1d9774ab | 5598 | MDL) != ISC_R_SUCCESS) { |
98bd7ca0 DH |
5599 | log_fatal("iterate_over_ia_na: no memory for " |
5600 | "key."); | |
5601 | } | |
5602 | ||
5603 | existing_ia_na = NULL; | |
b31fe1d5 TM |
5604 | if (ia_hash_lookup(&existing_ia_na, ia_na_active, |
5605 | (unsigned char *)key.data, | |
9322442f | 5606 | key.len, MDL)) { |
b31fe1d5 | 5607 | /* |
98bd7ca0 DH |
5608 | * Make sure this address is in the IA_NA. |
5609 | */ | |
1d17db44 FD |
5610 | for (i=0; i<existing_ia_na->num_iasubopt; i++) { |
5611 | struct iasubopt *tmp; | |
98bd7ca0 DH |
5612 | struct in6_addr *in6_addr; |
5613 | ||
1d17db44 | 5614 | tmp = existing_ia_na->iasubopt[i]; |
98bd7ca0 | 5615 | in6_addr = &tmp->addr; |
b31fe1d5 | 5616 | if (memcmp(in6_addr, |
98bd7ca0 | 5617 | iaaddr.data, 16) == 0) { |
1d17db44 FD |
5618 | iasubopt_reference(&lease, |
5619 | tmp, MDL); | |
98bd7ca0 | 5620 | break; |
5279b8f3 | 5621 | } |
98bd7ca0 DH |
5622 | } |
5623 | } | |
5624 | ||
5625 | data_string_forget(&key, MDL); | |
5626 | } | |
5627 | ||
5628 | if ((host != NULL) || (lease != NULL)) { | |
5629 | ia_na_match(client_id, &iaaddr, lease); | |
5630 | } else { | |
b31fe1d5 TM |
5631 | ia_na_nomatch(client_id, &iaaddr, |
5632 | (u_int32_t *)cli_enc_opt_data.data, | |
5633 | packet, reply_data, &reply_ofs, | |
98bd7ca0 DH |
5634 | sizeof(reply_data)); |
5635 | } | |
5636 | ||
5637 | if (lease != NULL) { | |
1d17db44 | 5638 | iasubopt_dereference(&lease, MDL); |
98bd7ca0 DH |
5639 | } |
5640 | ||
5641 | data_string_forget(&iaaddr, MDL); | |
5642 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5643 | data_string_forget(&cli_enc_opt_data, MDL); | |
5644 | } | |
5645 | ||
b31fe1d5 | 5646 | /* |
98bd7ca0 DH |
5647 | * Return our reply to the caller. |
5648 | */ | |
5649 | reply_ret->len = reply_ofs; | |
5650 | reply_ret->buffer = NULL; | |
5651 | if (!buffer_allocate(&reply_ret->buffer, reply_ofs, MDL)) { | |
5652 | log_fatal("No memory to store reply."); | |
5653 | } | |
5654 | reply_ret->data = reply_ret->buffer->data; | |
5655 | memcpy(reply_ret->buffer->data, reply, reply_ofs); | |
5656 | ||
5657 | exit: | |
5658 | if (lease != NULL) { | |
1d17db44 | 5659 | iasubopt_dereference(&lease, MDL); |
98bd7ca0 DH |
5660 | } |
5661 | if (host_opt_state != NULL) { | |
5662 | option_state_dereference(&host_opt_state, MDL); | |
5663 | } | |
5664 | if (fixed_addr.buffer != NULL) { | |
5665 | data_string_forget(&fixed_addr, MDL); | |
5666 | } | |
5667 | if (iaaddr.buffer != NULL) { | |
5668 | data_string_forget(&iaaddr, MDL); | |
5669 | } | |
5670 | if (cli_enc_opt_state != NULL) { | |
5671 | option_state_dereference(&cli_enc_opt_state, MDL); | |
5672 | } | |
5673 | if (cli_enc_opt_data.buffer != NULL) { | |
5674 | data_string_forget(&cli_enc_opt_data, MDL); | |
5675 | } | |
5676 | if (opt_state != NULL) { | |
5677 | option_state_dereference(&opt_state, MDL); | |
5678 | } | |
5679 | } | |
5680 | ||
5681 | /* | |
5682 | * Decline means a client has detected that something else is using an | |
5683 | * address we gave it. | |
5684 | * | |
5685 | * Since we're only dealing with fixed leases for now, there's not | |
20ae1aff | 5686 | * much we can do, other that log the occurrence. |
b31fe1d5 | 5687 | * |
98bd7ca0 DH |
5688 | * When we start issuing addresses from pools, then we will have to |
5689 | * record our declined addresses and issue another. In general with | |
5690 | * IPv6 there is no worry about DoS by clients exhausting space, but | |
5691 | * we still need to be aware of this possibility. | |
5692 | */ | |
5693 | ||
98bd7ca0 DH |
5694 | /* TODO: IA_TA */ |
5695 | static void | |
5696 | dhcpv6_decline(struct data_string *reply, struct packet *packet) { | |
5697 | struct data_string client_id; | |
5698 | struct data_string server_id; | |
5699 | ||
b31fe1d5 | 5700 | /* |
98bd7ca0 DH |
5701 | * Validate our input. |
5702 | */ | |
5703 | if (!valid_client_resp(packet, &client_id, &server_id)) { | |
5704 | return; | |
5705 | } | |
5706 | ||
b31fe1d5 TM |
5707 | /* If the DECLINE arrived via unicast and unicast option isn't set, |
5708 | * reject it per RFC 3315, Sec 18.2.7 */ | |
5709 | if (packet->unicast == ISC_TRUE && | |
5710 | is_unicast_option_defined(packet) == ISC_FALSE) { | |
5711 | unicast_reject(reply, packet, &client_id, &server_id); | |
5712 | } else { | |
5713 | /* | |
5714 | * Undefined for IA_PD. | |
5715 | */ | |
5716 | delete_option(&dhcpv6_universe, packet->options, D6O_IA_PD); | |
80c9fdb0 | 5717 | |
b31fe1d5 TM |
5718 | /* |
5719 | * And operate on each IA_NA in this packet. | |
5720 | */ | |
5721 | iterate_over_ia_na(reply, packet, &client_id, &server_id, | |
5722 | "Decline", ia_na_match_decline, | |
5723 | ia_na_nomatch_decline); | |
5724 | ||
5725 | } | |
80c9fdb0 FD |
5726 | |
5727 | data_string_forget(&server_id, MDL); | |
5728 | data_string_forget(&client_id, MDL); | |
98bd7ca0 DH |
5729 | } |
5730 | ||
5731 | static void | |
5732 | ia_na_match_release(const struct data_string *client_id, | |
5733 | const struct data_string *iaaddr, | |
1d17db44 | 5734 | struct iasubopt *lease) |
c382bc98 | 5735 | { |
98bd7ca0 DH |
5736 | char tmp_addr[INET6_ADDRSTRLEN]; |
5737 | ||
5738 | log_info("Client %s releases address %s", | |
5739 | print_hex_1(client_id->len, client_id->data, 60), | |
5740 | inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); | |
5741 | if (lease != NULL) { | |
5742 | release_lease6(lease->ipv6_pool, lease); | |
1acab09f | 5743 | lease->ia->cltt = cur_time; |
9322442f | 5744 | write_ia(lease->ia); |
98bd7ca0 DH |
5745 | } |
5746 | } | |
5747 | ||
5748 | static void | |
5749 | ia_na_nomatch_release(const struct data_string *client_id, | |
5750 | const struct data_string *iaaddr, | |
5751 | u_int32_t *ia_na_id, | |
5752 | struct packet *packet, | |
5753 | char *reply_data, | |
5754 | int *reply_ofs, | |
c382bc98 SK |
5755 | int reply_len) |
5756 | { | |
98bd7ca0 DH |
5757 | char tmp_addr[INET6_ADDRSTRLEN]; |
5758 | struct option_state *host_opt_state; | |
5759 | int len; | |
5760 | ||
5761 | log_info("Client %s releases address %s, which is not leased to it.", | |
5762 | print_hex_1(client_id->len, client_id->data, 60), | |
5763 | inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); | |
5764 | ||
5765 | /* | |
5766 | * Create state for this IA_NA. | |
5767 | */ | |
5768 | host_opt_state = NULL; | |
5769 | if (!option_state_allocate(&host_opt_state, MDL)) { | |
c382bc98 | 5770 | log_error("ia_na_nomatch_release: out of memory " |
98bd7ca0 DH |
5771 | "allocating option_state."); |
5772 | goto exit; | |
5773 | } | |
5774 | ||
b31fe1d5 | 5775 | if (!set_status_code(STATUS_NoBinding, |
98bd7ca0 DH |
5776 | "Release for non-leased address.", |
5777 | host_opt_state)) { | |
5778 | goto exit; | |
5779 | } | |
5780 | ||
5781 | /* | |
5782 | * Insure we have enough space | |
5783 | */ | |
5784 | if (reply_len < (*reply_ofs + 16)) { | |
c382bc98 | 5785 | log_error("ia_na_nomatch_release: " |
98bd7ca0 DH |
5786 | "out of space for reply packet."); |
5787 | goto exit; | |
5788 | } | |
5789 | ||
5790 | /* | |
5791 | * Put our status code into the reply packet. | |
5792 | */ | |
5793 | len = store_options6(reply_data+(*reply_ofs)+16, | |
5794 | reply_len-(*reply_ofs)-16, | |
5795 | host_opt_state, packet, | |
5796 | required_opts_STATUS_CODE, NULL); | |
5797 | ||
5798 | /* | |
b31fe1d5 TM |
5799 | * Store the non-encapsulated option data for this |
5800 | * IA_NA into our reply packet. Defined in RFC 3315, | |
5801 | * section 22.4. | |
98bd7ca0 DH |
5802 | */ |
5803 | /* option number */ | |
28868515 | 5804 | putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_NA); |
98bd7ca0 | 5805 | /* option length */ |
28868515 | 5806 | putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); |
98bd7ca0 DH |
5807 | /* IA_NA, copied from the client */ |
5808 | memcpy(reply_data+(*reply_ofs)+4, ia_na_id, 4); | |
5809 | /* t1 and t2, odd that we need them, but here it is */ | |
28868515 SK |
5810 | putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); |
5811 | putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); | |
98bd7ca0 DH |
5812 | |
5813 | /* | |
5814 | * Get ready for next IA_NA. | |
5815 | */ | |
5816 | *reply_ofs += (len + 16); | |
5817 | ||
5818 | exit: | |
5819 | option_state_dereference(&host_opt_state, MDL); | |
5820 | } | |
5821 | ||
80c9fdb0 FD |
5822 | static void |
5823 | ia_pd_match_release(const struct data_string *client_id, | |
5824 | const struct data_string *iapref, | |
1d17db44 | 5825 | struct iasubopt *prefix) |
80c9fdb0 FD |
5826 | { |
5827 | char tmp_addr[INET6_ADDRSTRLEN]; | |
5828 | ||
5829 | log_info("Client %s releases prefix %s/%u", | |
5830 | print_hex_1(client_id->len, client_id->data, 60), | |
5831 | inet_ntop(AF_INET6, iapref->data + 9, | |
5832 | tmp_addr, sizeof(tmp_addr)), | |
5833 | (unsigned) getUChar(iapref->data + 8)); | |
5834 | if (prefix != NULL) { | |
9322442f | 5835 | release_lease6(prefix->ipv6_pool, prefix); |
1acab09f | 5836 | prefix->ia->cltt = cur_time; |
9322442f | 5837 | write_ia(prefix->ia); |
80c9fdb0 FD |
5838 | } |
5839 | } | |
5840 | ||
5841 | static void | |
5842 | ia_pd_nomatch_release(const struct data_string *client_id, | |
5843 | const struct data_string *iapref, | |
5844 | u_int32_t *ia_pd_id, | |
5845 | struct packet *packet, | |
5846 | char *reply_data, | |
5847 | int *reply_ofs, | |
5848 | int reply_len) | |
5849 | { | |
5850 | char tmp_addr[INET6_ADDRSTRLEN]; | |
5851 | struct option_state *host_opt_state; | |
5852 | int len; | |
5853 | ||
5854 | log_info("Client %s releases prefix %s/%u, which is not leased to it.", | |
5855 | print_hex_1(client_id->len, client_id->data, 60), | |
5856 | inet_ntop(AF_INET6, iapref->data + 9, | |
5857 | tmp_addr, sizeof(tmp_addr)), | |
5858 | (unsigned) getUChar(iapref->data + 8)); | |
5859 | ||
5860 | /* | |
5861 | * Create state for this IA_PD. | |
5862 | */ | |
5863 | host_opt_state = NULL; | |
5864 | if (!option_state_allocate(&host_opt_state, MDL)) { | |
5865 | log_error("ia_pd_nomatch_release: out of memory " | |
5866 | "allocating option_state."); | |
5867 | goto exit; | |
5868 | } | |
5869 | ||
b31fe1d5 | 5870 | if (!set_status_code(STATUS_NoBinding, |
80c9fdb0 FD |
5871 | "Release for non-leased prefix.", |
5872 | host_opt_state)) { | |
5873 | goto exit; | |
5874 | } | |
5875 | ||
5876 | /* | |
5877 | * Insure we have enough space | |
5878 | */ | |
5879 | if (reply_len < (*reply_ofs + 16)) { | |
5880 | log_error("ia_pd_nomatch_release: " | |
5881 | "out of space for reply packet."); | |
5882 | goto exit; | |
5883 | } | |
5884 | ||
5885 | /* | |
5886 | * Put our status code into the reply packet. | |
5887 | */ | |
5888 | len = store_options6(reply_data+(*reply_ofs)+16, | |
5889 | reply_len-(*reply_ofs)-16, | |
5890 | host_opt_state, packet, | |
5891 | required_opts_STATUS_CODE, NULL); | |
5892 | ||
5893 | /* | |
b31fe1d5 TM |
5894 | * Store the non-encapsulated option data for this |
5895 | * IA_PD into our reply packet. Defined in RFC 3315, | |
5896 | * section 22.4. | |
80c9fdb0 FD |
5897 | */ |
5898 | /* option number */ | |
5899 | putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_PD); | |
5900 | /* option length */ | |
5901 | putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); | |
5902 | /* IA_PD, copied from the client */ | |
5903 | memcpy(reply_data+(*reply_ofs)+4, ia_pd_id, 4); | |
5904 | /* t1 and t2, odd that we need them, but here it is */ | |
5905 | putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); | |
5906 | putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); | |
5907 | ||
5908 | /* | |
5909 | * Get ready for next IA_PD. | |
5910 | */ | |
5911 | *reply_ofs += (len + 16); | |
5912 | ||
5913 | exit: | |
5914 | option_state_dereference(&host_opt_state, MDL); | |
5915 | } | |
5916 | ||
5917 | static void | |
b31fe1d5 | 5918 | iterate_over_ia_pd(struct data_string *reply_ret, |
80c9fdb0 FD |
5919 | struct packet *packet, |
5920 | const struct data_string *client_id, | |
5921 | const struct data_string *server_id, | |
5922 | const char *packet_type, | |
5923 | void (*ia_pd_match)(), | |
5924 | void (*ia_pd_nomatch)()) | |
5925 | { | |
5926 | struct data_string reply_new; | |
5927 | int reply_len; | |
5928 | struct option_state *opt_state; | |
5929 | struct host_decl *packet_host; | |
5930 | struct option_cache *ia; | |
5931 | struct option_cache *oc; | |
5932 | /* cli_enc_... variables come from the IA_PD options */ | |
5933 | struct data_string cli_enc_opt_data; | |
5934 | struct option_state *cli_enc_opt_state; | |
5935 | struct host_decl *host; | |
5936 | struct option_state *host_opt_state; | |
5937 | struct data_string iaprefix; | |
80c9fdb0 FD |
5938 | char reply_data[65536]; |
5939 | int reply_ofs; | |
1d17db44 | 5940 | struct iasubopt *prefix; |
9322442f | 5941 | struct ia_xx *existing_ia_pd; |
80c9fdb0 FD |
5942 | int i; |
5943 | struct data_string key; | |
5944 | u_int32_t iaid; | |
5945 | ||
5946 | /* | |
5947 | * Initialize to empty values, in case we have to exit early. | |
5948 | */ | |
5949 | memset(&reply_new, 0, sizeof(reply_new)); | |
5950 | opt_state = NULL; | |
5951 | memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); | |
5952 | cli_enc_opt_state = NULL; | |
5953 | memset(&iaprefix, 0, sizeof(iaprefix)); | |
5954 | host_opt_state = NULL; | |
5955 | prefix = NULL; | |
5956 | ||
5957 | /* | |
5958 | * Compute the available length for the reply. | |
5959 | */ | |
5960 | reply_len = sizeof(reply_data) - reply_ret->len; | |
5961 | reply_ofs = 0; | |
5962 | ||
b31fe1d5 | 5963 | /* |
80c9fdb0 FD |
5964 | * Find the host record that matches from the packet, if any. |
5965 | */ | |
5966 | packet_host = NULL; | |
62a9eb91 | 5967 | find_hosts6(&packet_host, packet, client_id, MDL); |
80c9fdb0 FD |
5968 | |
5969 | /* | |
5970 | * Build our option state for reply. | |
5971 | */ | |
5972 | opt_state = NULL; | |
5973 | if (!option_state_allocate(&opt_state, MDL)) { | |
5974 | log_error("iterate_over_ia_pd: no memory for option_state."); | |
5975 | goto exit; | |
5976 | } | |
b31fe1d5 TM |
5977 | execute_statements_in_scope(NULL, packet, NULL, NULL, |
5978 | packet->options, opt_state, | |
a7341359 | 5979 | &global_scope, root_group, NULL, NULL); |
80c9fdb0 FD |
5980 | |
5981 | /* | |
5982 | * Loop through the IA_PD reported by the client, and deal with | |
5983 | * prefixes reported as already in use. | |
5984 | */ | |
5985 | for (ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); | |
5986 | ia != NULL; ia = ia->next) { | |
80c9fdb0 FD |
5987 | |
5988 | if (!get_encapsulated_IA_state(&cli_enc_opt_state, | |
5989 | &cli_enc_opt_data, | |
5990 | packet, ia, IA_PD_OFFSET)) { | |
5991 | goto exit; | |
5992 | } | |
5993 | ||
5994 | iaid = getULong(cli_enc_opt_data.data); | |
5995 | ||
b31fe1d5 | 5996 | oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, |
80c9fdb0 FD |
5997 | D6O_IAPREFIX); |
5998 | if (oc == NULL) { | |
5999 | /* no prefix given for this IA_PD, ignore */ | |
6000 | option_state_dereference(&cli_enc_opt_state, MDL); | |
6001 | data_string_forget(&cli_enc_opt_data, MDL); | |
6002 | continue; | |
6003 | } | |
6004 | ||
6005 | for (; oc != NULL; oc = oc->next) { | |
6006 | memset(&iaprefix, 0, sizeof(iaprefix)); | |
b31fe1d5 | 6007 | if (!evaluate_option_cache(&iaprefix, packet, NULL, NULL, |
80c9fdb0 FD |
6008 | packet->options, NULL, |
6009 | &global_scope, oc, MDL)) { | |
6010 | log_error("iterate_over_ia_pd: " | |
6011 | "error evaluating IAPREFIX."); | |
6012 | goto exit; | |
6013 | } | |
6014 | ||
b31fe1d5 | 6015 | /* |
80c9fdb0 | 6016 | * Now we need to figure out which host record matches |
c900c5b2 DH |
6017 | * this IA_PD and IAPREFIX (encapsulated option contents |
6018 | * matching a host record by option). | |
80c9fdb0 FD |
6019 | * |
6020 | * XXX: We don't currently track IA_PD separately, but | |
6021 | * we will need to do this! | |
6022 | */ | |
6023 | host = NULL; | |
b31fe1d5 TM |
6024 | if (!find_hosts_by_option(&host, packet, |
6025 | cli_enc_opt_state, MDL)) { | |
80c9fdb0 FD |
6026 | if (packet_host != NULL) { |
6027 | host = packet_host; | |
6028 | } else { | |
6029 | host = NULL; | |
6030 | } | |
6031 | } | |
6032 | while (host != NULL) { | |
6033 | if (host->fixed_prefix != NULL) { | |
6034 | struct iaddrcidrnetlist *l; | |
6035 | int plen = (int) getUChar(iaprefix.data + 8); | |
6036 | ||
6037 | for (l = host->fixed_prefix; l != NULL; | |
6038 | l = l->next) { | |
6039 | if (plen != l->cidrnet.bits) | |
6040 | continue; | |
6041 | if (memcmp(iaprefix.data + 9, | |
6042 | l->cidrnet.lo_addr.iabuf, | |
6043 | 16) == 0) | |
6044 | break; | |
6045 | } | |
6046 | if ((l != NULL) && (iaprefix.len >= 17)) | |
6047 | break; | |
6048 | } | |
6049 | host = host->n_ipaddr; | |
6050 | } | |
6051 | ||
6052 | if ((host == NULL) && (iaprefix.len >= IAPREFIX_OFFSET)) { | |
6053 | /* | |
6054 | * Find existing IA_PD. | |
6055 | */ | |
b31fe1d5 | 6056 | if (ia_make_key(&key, iaid, |
80c9fdb0 | 6057 | (char *)client_id->data, |
b31fe1d5 | 6058 | client_id->len, |
80c9fdb0 FD |
6059 | MDL) != ISC_R_SUCCESS) { |
6060 | log_fatal("iterate_over_ia_pd: no memory for " | |
6061 | "key."); | |
6062 | } | |
6063 | ||
6064 | existing_ia_pd = NULL; | |
b31fe1d5 TM |
6065 | if (ia_hash_lookup(&existing_ia_pd, ia_pd_active, |
6066 | (unsigned char *)key.data, | |
9322442f | 6067 | key.len, MDL)) { |
b31fe1d5 | 6068 | /* |
80c9fdb0 FD |
6069 | * Make sure this prefix is in the IA_PD. |
6070 | */ | |
6071 | for (i = 0; | |
1d17db44 | 6072 | i < existing_ia_pd->num_iasubopt; |
80c9fdb0 | 6073 | i++) { |
1d17db44 | 6074 | struct iasubopt *tmp; |
80c9fdb0 FD |
6075 | u_int8_t plen; |
6076 | ||
6077 | plen = getUChar(iaprefix.data + 8); | |
1d17db44 | 6078 | tmp = existing_ia_pd->iasubopt[i]; |
80c9fdb0 | 6079 | if ((tmp->plen == plen) && |
9322442f | 6080 | (memcmp(&tmp->addr, |
80c9fdb0 FD |
6081 | iaprefix.data + 9, |
6082 | 16) == 0)) { | |
1d17db44 FD |
6083 | iasubopt_reference(&prefix, |
6084 | tmp, MDL); | |
80c9fdb0 FD |
6085 | break; |
6086 | } | |
6087 | } | |
6088 | } | |
6089 | ||
6090 | data_string_forget(&key, MDL); | |
6091 | } | |
6092 | ||
6093 | if ((host != NULL) || (prefix != NULL)) { | |
6094 | ia_pd_match(client_id, &iaprefix, prefix); | |
6095 | } else { | |
b31fe1d5 TM |
6096 | ia_pd_nomatch(client_id, &iaprefix, |
6097 | (u_int32_t *)cli_enc_opt_data.data, | |
6098 | packet, reply_data, &reply_ofs, | |
80c9fdb0 FD |
6099 | reply_len - reply_ofs); |
6100 | } | |
6101 | ||
6102 | if (prefix != NULL) { | |
1d17db44 | 6103 | iasubopt_dereference(&prefix, MDL); |
80c9fdb0 FD |
6104 | } |
6105 | ||
6106 | data_string_forget(&iaprefix, MDL); | |
6107 | } | |
6108 | ||
6109 | option_state_dereference(&cli_enc_opt_state, MDL); | |
6110 | data_string_forget(&cli_enc_opt_data, MDL); | |
6111 | } | |
6112 | ||
b31fe1d5 | 6113 | /* |
80c9fdb0 FD |
6114 | * Return our reply to the caller. |
6115 | * The IA_NA routine has already filled at least the header. | |
6116 | */ | |
6117 | reply_new.len = reply_ret->len + reply_ofs; | |
6118 | if (!buffer_allocate(&reply_new.buffer, reply_new.len, MDL)) { | |
6119 | log_fatal("No memory to store reply."); | |
6120 | } | |
6121 | reply_new.data = reply_new.buffer->data; | |
6122 | memcpy(reply_new.buffer->data, | |
6123 | reply_ret->buffer->data, reply_ret->len); | |
6124 | memcpy(reply_new.buffer->data + reply_ret->len, | |
6125 | reply_data, reply_ofs); | |
6126 | data_string_forget(reply_ret, MDL); | |
6127 | data_string_copy(reply_ret, &reply_new, MDL); | |
6128 | data_string_forget(&reply_new, MDL); | |
6129 | ||
6130 | exit: | |
6131 | if (prefix != NULL) { | |
1d17db44 | 6132 | iasubopt_dereference(&prefix, MDL); |
80c9fdb0 FD |
6133 | } |
6134 | if (host_opt_state != NULL) { | |
6135 | option_state_dereference(&host_opt_state, MDL); | |
6136 | } | |
6137 | if (iaprefix.buffer != NULL) { | |
6138 | data_string_forget(&iaprefix, MDL); | |
6139 | } | |
6140 | if (cli_enc_opt_state != NULL) { | |
6141 | option_state_dereference(&cli_enc_opt_state, MDL); | |
6142 | } | |
6143 | if (cli_enc_opt_data.buffer != NULL) { | |
6144 | data_string_forget(&cli_enc_opt_data, MDL); | |
6145 | } | |
6146 | if (opt_state != NULL) { | |
6147 | option_state_dereference(&opt_state, MDL); | |
6148 | } | |
6149 | } | |
6150 | ||
98bd7ca0 | 6151 | /* |
9322442f | 6152 | * Release means a client is done with the leases. |
98bd7ca0 DH |
6153 | */ |
6154 | ||
98bd7ca0 DH |
6155 | static void |
6156 | dhcpv6_release(struct data_string *reply, struct packet *packet) { | |
6157 | struct data_string client_id; | |
6158 | struct data_string server_id; | |
6159 | ||
b31fe1d5 | 6160 | /* |
98bd7ca0 DH |
6161 | * Validate our input. |
6162 | */ | |
6163 | if (!valid_client_resp(packet, &client_id, &server_id)) { | |
6164 | return; | |
6165 | } | |
6166 | ||
b31fe1d5 TM |
6167 | /* If the RELEASE arrived via unicast and unicast option isn't set, |
6168 | * reject it per RFC 3315, Sec 18.2.6 */ | |
6169 | if (packet->unicast == ISC_TRUE && | |
6170 | is_unicast_option_defined(packet) == ISC_FALSE) { | |
6171 | unicast_reject(reply, packet, &client_id, &server_id); | |
6172 | } else { | |
6173 | /* | |
6174 | * And operate on each IA_NA in this packet. | |
6175 | */ | |
6176 | iterate_over_ia_na(reply, packet, &client_id, &server_id, | |
6177 | "Release", ia_na_match_release, | |
6178 | ia_na_nomatch_release); | |
98bd7ca0 | 6179 | |
b31fe1d5 TM |
6180 | /* |
6181 | * And operate on each IA_PD in this packet. | |
6182 | */ | |
6183 | iterate_over_ia_pd(reply, packet, &client_id, &server_id, | |
6184 | "Release", ia_pd_match_release, | |
6185 | ia_pd_nomatch_release); | |
6186 | } | |
80c9fdb0 | 6187 | |
98bd7ca0 DH |
6188 | data_string_forget(&server_id, MDL); |
6189 | data_string_forget(&client_id, MDL); | |
6190 | } | |
6191 | ||
6192 | /* | |
6193 | * Information-Request is used by clients who have obtained an address | |
6194 | * from other means, but want configuration information from the server. | |
6195 | */ | |
6196 | ||
98bd7ca0 DH |
6197 | static void |
6198 | dhcpv6_information_request(struct data_string *reply, struct packet *packet) { | |
6199 | struct data_string client_id; | |
6200 | struct data_string server_id; | |
6201 | ||
6202 | /* | |
6203 | * Validate our input. | |
6204 | */ | |
6205 | if (!valid_client_info_req(packet, &server_id)) { | |
6206 | return; | |
6207 | } | |
6208 | ||
6209 | /* | |
6210 | * Get our client ID, if there is one. | |
6211 | */ | |
6212 | memset(&client_id, 0, sizeof(client_id)); | |
6213 | if (get_client_id(packet, &client_id) != ISC_R_SUCCESS) { | |
6214 | data_string_forget(&client_id, MDL); | |
6215 | } | |
6216 | ||
6217 | /* | |
b31fe1d5 TM |
6218 | * Use the lease_to_client() function. This will work fine, |
6219 | * because the valid_client_info_req() insures that we | |
80c9fdb0 FD |
6220 | * don't have any IA that would cause us to allocate |
6221 | * resources to the client. | |
98bd7ca0 | 6222 | */ |
4f963ddc FD |
6223 | lease_to_client(reply, packet, &client_id, |
6224 | server_id.data != NULL ? &server_id : NULL); | |
98bd7ca0 DH |
6225 | |
6226 | /* | |
6227 | * Cleanup. | |
6228 | */ | |
6229 | if (client_id.data != NULL) { | |
6230 | data_string_forget(&client_id, MDL); | |
6231 | } | |
6232 | data_string_forget(&server_id, MDL); | |
6233 | } | |
6234 | ||
b31fe1d5 | 6235 | /* |
98bd7ca0 DH |
6236 | * The Relay-forw message is sent by relays. It typically contains a |
6237 | * single option, which encapsulates an entire packet. | |
6238 | * | |
6239 | * We need to build an encapsulated reply. | |
6240 | */ | |
6241 | ||
6242 | /* XXX: this is very, very similar to do_packet6(), and should probably | |
6243 | be combined in a clever way */ | |
6244 | static void | |
6245 | dhcpv6_relay_forw(struct data_string *reply_ret, struct packet *packet) { | |
98bd7ca0 DH |
6246 | struct option_cache *oc; |
6247 | struct data_string enc_opt_data; | |
6248 | struct packet *enc_packet; | |
6249 | unsigned char msg_type; | |
5279b8f3 DH |
6250 | const struct dhcpv6_packet *msg; |
6251 | const struct dhcpv6_relay_packet *relay; | |
98bd7ca0 DH |
6252 | struct data_string enc_reply; |
6253 | char link_addr[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; | |
6254 | char peer_addr[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; | |
2b964ac0 FD |
6255 | struct data_string a_opt, packet_ero; |
6256 | struct option_state *opt_state; | |
6257 | static char reply_data[65536]; | |
6258 | struct dhcpv6_relay_packet *reply; | |
6259 | int reply_ofs; | |
98bd7ca0 | 6260 | |
b31fe1d5 | 6261 | /* |
20ae1aff | 6262 | * Initialize variables for early exit. |
98bd7ca0 | 6263 | */ |
93c769ce | 6264 | opt_state = NULL; |
2b964ac0 FD |
6265 | memset(&a_opt, 0, sizeof(a_opt)); |
6266 | memset(&packet_ero, 0, sizeof(packet_ero)); | |
93c769ce FD |
6267 | memset(&enc_reply, 0, sizeof(enc_reply)); |
6268 | memset(&enc_opt_data, 0, sizeof(enc_opt_data)); | |
6269 | enc_packet = NULL; | |
98bd7ca0 DH |
6270 | |
6271 | /* | |
6272 | * Get our encapsulated relay message. | |
6273 | */ | |
6274 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_RELAY_MSG); | |
6275 | if (oc == NULL) { | |
6276 | inet_ntop(AF_INET6, &packet->dhcpv6_link_address, | |
6277 | link_addr, sizeof(link_addr)); | |
6278 | inet_ntop(AF_INET6, &packet->dhcpv6_peer_address, | |
6279 | peer_addr, sizeof(peer_addr)); | |
6280 | log_info("Relay-forward from %s with link address=%s and " | |
6281 | "peer address=%s missing Relay Message option.", | |
6282 | piaddr(packet->client_addr), link_addr, peer_addr); | |
6283 | goto exit; | |
6284 | } | |
6285 | ||
b31fe1d5 | 6286 | if (!evaluate_option_cache(&enc_opt_data, NULL, NULL, NULL, |
98bd7ca0 DH |
6287 | NULL, NULL, &global_scope, oc, MDL)) { |
6288 | log_error("dhcpv6_forw_relay: error evaluating " | |
6289 | "relayed message."); | |
6290 | goto exit; | |
6291 | } | |
6292 | ||
28868515 | 6293 | if (!packet6_len_okay((char *)enc_opt_data.data, enc_opt_data.len)) { |
98bd7ca0 DH |
6294 | log_error("dhcpv6_forw_relay: encapsulated packet too short."); |
6295 | goto exit; | |
6296 | } | |
6297 | ||
6298 | /* | |
6299 | * Build a packet structure from this encapsulated packet. | |
6300 | */ | |
6301 | enc_packet = NULL; | |
6302 | if (!packet_allocate(&enc_packet, MDL)) { | |
6303 | log_error("dhcpv6_forw_relay: " | |
6304 | "no memory for encapsulated packet."); | |
6305 | goto exit; | |
6306 | } | |
6307 | ||
6308 | if (!option_state_allocate(&enc_packet->options, MDL)) { | |
6309 | log_error("dhcpv6_forw_relay: " | |
6310 | "no memory for encapsulated packet's options."); | |
6311 | goto exit; | |
6312 | } | |
6313 | ||
6314 | enc_packet->client_port = packet->client_port; | |
6315 | enc_packet->client_addr = packet->client_addr; | |
4dc5a6b1 | 6316 | interface_reference(&enc_packet->interface, packet->interface, MDL); |
98bd7ca0 DH |
6317 | enc_packet->dhcpv6_container_packet = packet; |
6318 | ||
6319 | msg_type = enc_opt_data.data[0]; | |
5279b8f3 DH |
6320 | if ((msg_type == DHCPV6_RELAY_FORW) || |
6321 | (msg_type == DHCPV6_RELAY_REPL)) { | |
b342f2e7 | 6322 | int relaylen = (int)(offsetof(struct dhcpv6_relay_packet, options)); |
5279b8f3 DH |
6323 | relay = (struct dhcpv6_relay_packet *)enc_opt_data.data; |
6324 | enc_packet->dhcpv6_msg_type = relay->msg_type; | |
98bd7ca0 | 6325 | |
5279b8f3 DH |
6326 | /* relay-specific data */ |
6327 | enc_packet->dhcpv6_hop_count = relay->hop_count; | |
98bd7ca0 DH |
6328 | memcpy(&enc_packet->dhcpv6_link_address, |
6329 | relay->link_address, sizeof(relay->link_address)); | |
6330 | memcpy(&enc_packet->dhcpv6_peer_address, | |
6331 | relay->peer_address, sizeof(relay->peer_address)); | |
6332 | ||
5279b8f3 | 6333 | if (!parse_option_buffer(enc_packet->options, |
b31fe1d5 | 6334 | relay->options, |
b342f2e7 | 6335 | enc_opt_data.len - relaylen, |
5279b8f3 DH |
6336 | &dhcpv6_universe)) { |
6337 | /* no logging here, as parse_option_buffer() logs all | |
6338 | cases where it fails */ | |
6339 | goto exit; | |
6340 | } | |
6341 | } else { | |
b342f2e7 | 6342 | int msglen = (int)(offsetof(struct dhcpv6_packet, options)); |
5279b8f3 DH |
6343 | msg = (struct dhcpv6_packet *)enc_opt_data.data; |
6344 | enc_packet->dhcpv6_msg_type = msg->msg_type; | |
6345 | ||
6346 | /* message-specific data */ | |
6347 | memcpy(enc_packet->dhcpv6_transaction_id, | |
6348 | msg->transaction_id, | |
6349 | sizeof(enc_packet->dhcpv6_transaction_id)); | |
6350 | ||
6351 | if (!parse_option_buffer(enc_packet->options, | |
b31fe1d5 | 6352 | msg->options, |
b342f2e7 | 6353 | enc_opt_data.len - msglen, |
5279b8f3 DH |
6354 | &dhcpv6_universe)) { |
6355 | /* no logging here, as parse_option_buffer() logs all | |
6356 | cases where it fails */ | |
6357 | goto exit; | |
6358 | } | |
6359 | } | |
98bd7ca0 DH |
6360 | |
6361 | /* | |
6362 | * This is recursive. It is possible to exceed maximum packet size. | |
6363 | * XXX: This will cause the packet send to fail. | |
6364 | */ | |
6365 | build_dhcpv6_reply(&enc_reply, enc_packet); | |
6366 | ||
6367 | /* | |
6368 | * If we got no encapsulated data, then it is discarded, and | |
6369 | * our reply-forw is also discarded. | |
6370 | */ | |
6371 | if (enc_reply.data == NULL) { | |
6372 | goto exit; | |
6373 | } | |
6374 | ||
6375 | /* | |
2b964ac0 FD |
6376 | * Now we can use the reply_data buffer. |
6377 | * Packet header stuff all comes from the forward message. | |
6378 | */ | |
6379 | reply = (struct dhcpv6_relay_packet *)reply_data; | |
6380 | reply->msg_type = DHCPV6_RELAY_REPL; | |
6381 | reply->hop_count = packet->dhcpv6_hop_count; | |
6382 | memcpy(reply->link_address, &packet->dhcpv6_link_address, | |
6383 | sizeof(reply->link_address)); | |
6384 | memcpy(reply->peer_address, &packet->dhcpv6_peer_address, | |
6385 | sizeof(reply->peer_address)); | |
a3528574 | 6386 | reply_ofs = (int)(offsetof(struct dhcpv6_relay_packet, options)); |
2b964ac0 FD |
6387 | |
6388 | /* | |
6389 | * Get the reply option state. | |
6390 | */ | |
6391 | opt_state = NULL; | |
6392 | if (!option_state_allocate(&opt_state, MDL)) { | |
6393 | log_error("dhcpv6_relay_forw: no memory for option state."); | |
6394 | goto exit; | |
6395 | } | |
6396 | ||
6397 | /* | |
6398 | * Append the interface-id if present. | |
98bd7ca0 | 6399 | */ |
2b964ac0 FD |
6400 | oc = lookup_option(&dhcpv6_universe, packet->options, |
6401 | D6O_INTERFACE_ID); | |
98bd7ca0 | 6402 | if (oc != NULL) { |
2b964ac0 | 6403 | if (!evaluate_option_cache(&a_opt, packet, |
b31fe1d5 | 6404 | NULL, NULL, |
2b964ac0 FD |
6405 | packet->options, NULL, |
6406 | &global_scope, oc, MDL)) { | |
6407 | log_error("dhcpv6_relay_forw: error evaluating " | |
6408 | "Interface ID."); | |
6409 | goto exit; | |
6410 | } | |
6411 | if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, | |
6412 | (unsigned char *)a_opt.data, | |
6413 | a_opt.len, | |
6414 | D6O_INTERFACE_ID, 0)) { | |
6415 | log_error("dhcpv6_relay_forw: error saving " | |
98bd7ca0 DH |
6416 | "Interface ID."); |
6417 | goto exit; | |
6418 | } | |
2b964ac0 | 6419 | data_string_forget(&a_opt, MDL); |
98bd7ca0 DH |
6420 | } |
6421 | ||
b31fe1d5 | 6422 | /* |
2b964ac0 | 6423 | * Append our encapsulated stuff for caller. |
98bd7ca0 | 6424 | */ |
2b964ac0 FD |
6425 | if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, |
6426 | (unsigned char *)enc_reply.data, | |
6427 | enc_reply.len, | |
6428 | D6O_RELAY_MSG, 0)) { | |
6429 | log_error("dhcpv6_relay_forw: error saving Relay MSG."); | |
6430 | goto exit; | |
98bd7ca0 | 6431 | } |
2b964ac0 FD |
6432 | |
6433 | /* | |
6434 | * Get the ERO if any. | |
98bd7ca0 | 6435 | */ |
2b964ac0 FD |
6436 | oc = lookup_option(&dhcpv6_universe, packet->options, D6O_ERO); |
6437 | if (oc != NULL) { | |
6438 | unsigned req; | |
6439 | int i; | |
6440 | ||
6441 | if (!evaluate_option_cache(&packet_ero, packet, | |
6442 | NULL, NULL, | |
6443 | packet->options, NULL, | |
6444 | &global_scope, oc, MDL) || | |
6445 | (packet_ero.len & 1)) { | |
6446 | log_error("dhcpv6_relay_forw: error evaluating ERO."); | |
6447 | goto exit; | |
6448 | } | |
6449 | ||
6450 | /* Decode and apply the ERO. */ | |
6451 | for (i = 0; i < packet_ero.len; i += 2) { | |
6452 | req = getUShort(packet_ero.data + i); | |
6453 | /* Already in the reply? */ | |
6454 | oc = lookup_option(&dhcpv6_universe, opt_state, req); | |
6455 | if (oc != NULL) | |
6456 | continue; | |
6457 | /* Get it from the packet if present. */ | |
6458 | oc = lookup_option(&dhcpv6_universe, | |
6459 | packet->options, | |
6460 | req); | |
6461 | if (oc == NULL) | |
6462 | continue; | |
6463 | if (!evaluate_option_cache(&a_opt, packet, | |
6464 | NULL, NULL, | |
6465 | packet->options, NULL, | |
6466 | &global_scope, oc, MDL)) { | |
6467 | log_error("dhcpv6_relay_forw: error " | |
6468 | "evaluating option %u.", req); | |
6469 | goto exit; | |
6470 | } | |
6471 | if (!save_option_buffer(&dhcpv6_universe, | |
6472 | opt_state, | |
6473 | NULL, | |
6474 | (unsigned char *)a_opt.data, | |
6475 | a_opt.len, | |
6476 | req, | |
6477 | 0)) { | |
6478 | log_error("dhcpv6_relay_forw: error saving " | |
6479 | "option %u.", req); | |
6480 | goto exit; | |
6481 | } | |
6482 | data_string_forget(&a_opt, MDL); | |
6483 | } | |
98bd7ca0 | 6484 | } |
2b964ac0 FD |
6485 | |
6486 | reply_ofs += store_options6(reply_data + reply_ofs, | |
6487 | sizeof(reply_data) - reply_ofs, | |
6488 | opt_state, packet, | |
6489 | required_opts_agent, &packet_ero); | |
6490 | ||
6491 | /* | |
6492 | * Return our reply to the caller. | |
6493 | */ | |
6494 | reply_ret->len = reply_ofs; | |
98bd7ca0 DH |
6495 | reply_ret->buffer = NULL; |
6496 | if (!buffer_allocate(&reply_ret->buffer, reply_ret->len, MDL)) { | |
6497 | log_fatal("No memory to store reply."); | |
6498 | } | |
6499 | reply_ret->data = reply_ret->buffer->data; | |
2b964ac0 | 6500 | memcpy(reply_ret->buffer->data, reply_data, reply_ofs); |
98bd7ca0 DH |
6501 | |
6502 | exit: | |
2b964ac0 FD |
6503 | if (opt_state != NULL) |
6504 | option_state_dereference(&opt_state, MDL); | |
6505 | if (a_opt.data != NULL) { | |
6506 | data_string_forget(&a_opt, MDL); | |
6507 | } | |
6508 | if (packet_ero.data != NULL) { | |
6509 | data_string_forget(&packet_ero, MDL); | |
98bd7ca0 DH |
6510 | } |
6511 | if (enc_reply.data != NULL) { | |
6512 | data_string_forget(&enc_reply, MDL); | |
6513 | } | |
6514 | if (enc_opt_data.data != NULL) { | |
6515 | data_string_forget(&enc_opt_data, MDL); | |
6516 | } | |
6517 | if (enc_packet != NULL) { | |
6518 | packet_dereference(&enc_packet, MDL); | |
6519 | } | |
6520 | } | |
6521 | ||
6522 | static void | |
6523 | dhcpv6_discard(struct packet *packet) { | |
6524 | /* INSIST(packet->msg_type > 0); */ | |
6525 | /* INSIST(packet->msg_type < dhcpv6_type_name_max); */ | |
6526 | ||
b31fe1d5 | 6527 | log_debug("Discarding %s from %s; message type not handled by server", |
98bd7ca0 DH |
6528 | dhcpv6_type_names[packet->dhcpv6_msg_type], |
6529 | piaddr(packet->client_addr)); | |
6530 | } | |
6531 | ||
b31fe1d5 | 6532 | static void |
98bd7ca0 DH |
6533 | build_dhcpv6_reply(struct data_string *reply, struct packet *packet) { |
6534 | memset(reply, 0, sizeof(*reply)); | |
01fa619f | 6535 | |
619304cd SR |
6536 | /* I would like to classify the client once here, but |
6537 | * as I don't want to classify all of the incoming packets | |
6538 | * I need to do it before handling specific types. | |
6539 | * We don't need to classify if we are tossing the packet | |
6540 | * or if it is a relay - the classification step will get | |
6541 | * done when we process the inner client packet. | |
6542 | */ | |
01fa619f | 6543 | |
98bd7ca0 DH |
6544 | switch (packet->dhcpv6_msg_type) { |
6545 | case DHCPV6_SOLICIT: | |
619304cd | 6546 | classify_client(packet); |
98bd7ca0 DH |
6547 | dhcpv6_solicit(reply, packet); |
6548 | break; | |
6549 | case DHCPV6_ADVERTISE: | |
6550 | dhcpv6_discard(packet); | |
6551 | break; | |
6552 | case DHCPV6_REQUEST: | |
619304cd | 6553 | classify_client(packet); |
98bd7ca0 DH |
6554 | dhcpv6_request(reply, packet); |
6555 | break; | |
6556 | case DHCPV6_CONFIRM: | |
619304cd | 6557 | classify_client(packet); |
98bd7ca0 DH |
6558 | dhcpv6_confirm(reply, packet); |
6559 | break; | |
6560 | case DHCPV6_RENEW: | |
619304cd | 6561 | classify_client(packet); |
98bd7ca0 DH |
6562 | dhcpv6_renew(reply, packet); |
6563 | break; | |
6564 | case DHCPV6_REBIND: | |
619304cd | 6565 | classify_client(packet); |
98bd7ca0 DH |
6566 | dhcpv6_rebind(reply, packet); |
6567 | break; | |
6568 | case DHCPV6_REPLY: | |
6569 | dhcpv6_discard(packet); | |
6570 | break; | |
6571 | case DHCPV6_RELEASE: | |
619304cd | 6572 | classify_client(packet); |
98bd7ca0 DH |
6573 | dhcpv6_release(reply, packet); |
6574 | break; | |
6575 | case DHCPV6_DECLINE: | |
619304cd | 6576 | classify_client(packet); |
98bd7ca0 DH |
6577 | dhcpv6_decline(reply, packet); |
6578 | break; | |
6579 | case DHCPV6_RECONFIGURE: | |
6580 | dhcpv6_discard(packet); | |
6581 | break; | |
6582 | case DHCPV6_INFORMATION_REQUEST: | |
619304cd | 6583 | classify_client(packet); |
98bd7ca0 DH |
6584 | dhcpv6_information_request(reply, packet); |
6585 | break; | |
6586 | case DHCPV6_RELAY_FORW: | |
6587 | dhcpv6_relay_forw(reply, packet); | |
6588 | break; | |
6589 | case DHCPV6_RELAY_REPL: | |
6590 | dhcpv6_discard(packet); | |
6591 | break; | |
37ec5845 | 6592 | case DHCPV6_LEASEQUERY: |
619304cd | 6593 | classify_client(packet); |
37ec5845 FD |
6594 | dhcpv6_leasequery(reply, packet); |
6595 | break; | |
6596 | case DHCPV6_LEASEQUERY_REPLY: | |
6597 | dhcpv6_discard(packet); | |
6598 | break; | |
98bd7ca0 | 6599 | default: |
b31fe1d5 | 6600 | /* XXX: would be nice if we had "notice" level, |
98bd7ca0 DH |
6601 | as syslog, for this */ |
6602 | log_info("Discarding unknown DHCPv6 message type %d " | |
b31fe1d5 | 6603 | "from %s", packet->dhcpv6_msg_type, |
98bd7ca0 DH |
6604 | piaddr(packet->client_addr)); |
6605 | } | |
6606 | } | |
6607 | ||
6608 | static void | |
6609 | log_packet_in(const struct packet *packet) { | |
6610 | struct data_string s; | |
6611 | u_int32_t tid; | |
6612 | char tmp_addr[INET6_ADDRSTRLEN]; | |
6613 | const void *addr; | |
98bd7ca0 DH |
6614 | |
6615 | memset(&s, 0, sizeof(s)); | |
6616 | ||
6617 | if (packet->dhcpv6_msg_type < dhcpv6_type_name_max) { | |
6618 | data_string_sprintfa(&s, "%s message from %s port %d", | |
6619 | dhcpv6_type_names[packet->dhcpv6_msg_type], | |
6620 | piaddr(packet->client_addr), | |
6621 | ntohs(packet->client_port)); | |
6622 | } else { | |
b31fe1d5 | 6623 | data_string_sprintfa(&s, |
98bd7ca0 DH |
6624 | "Unknown message type %d from %s port %d", |
6625 | packet->dhcpv6_msg_type, | |
6626 | piaddr(packet->client_addr), | |
6627 | ntohs(packet->client_port)); | |
6628 | } | |
b31fe1d5 | 6629 | if ((packet->dhcpv6_msg_type == DHCPV6_RELAY_FORW) || |
98bd7ca0 DH |
6630 | (packet->dhcpv6_msg_type == DHCPV6_RELAY_REPL)) { |
6631 | addr = &packet->dhcpv6_link_address; | |
b31fe1d5 TM |
6632 | data_string_sprintfa(&s, ", link address %s", |
6633 | inet_ntop(AF_INET6, addr, | |
98bd7ca0 DH |
6634 | tmp_addr, sizeof(tmp_addr))); |
6635 | addr = &packet->dhcpv6_peer_address; | |
b31fe1d5 TM |
6636 | data_string_sprintfa(&s, ", peer address %s", |
6637 | inet_ntop(AF_INET6, addr, | |
98bd7ca0 DH |
6638 | tmp_addr, sizeof(tmp_addr))); |
6639 | } else { | |
6640 | tid = 0; | |
6641 | memcpy(((char *)&tid)+1, packet->dhcpv6_transaction_id, 3); | |
6642 | data_string_sprintfa(&s, ", transaction ID 0x%06X", tid); | |
6643 | ||
6644 | /* | |
b31fe1d5 | 6645 | oc = lookup_option(&dhcpv6_universe, packet->options, |
98bd7ca0 DH |
6646 | D6O_CLIENTID); |
6647 | if (oc != NULL) { | |
6648 | memset(&tmp_ds, 0, sizeof(tmp_ds_)); | |
b31fe1d5 | 6649 | if (!evaluate_option_cache(&tmp_ds, packet, NULL, NULL, |
98bd7ca0 DH |
6650 | packet->options, NULL, |
6651 | &global_scope, oc, MDL)) { | |
6652 | log_error("Error evaluating Client Identifier"); | |
6653 | } else { | |
6654 | data_strint_sprintf(&s, ", client ID %s", | |
6655 | ||
6656 | data_string_forget(&tmp_ds, MDL); | |
6657 | } | |
6658 | } | |
6659 | */ | |
6660 | ||
6661 | } | |
6662 | log_info("%s", s.data); | |
6663 | ||
6664 | data_string_forget(&s, MDL); | |
6665 | } | |
6666 | ||
b31fe1d5 | 6667 | void |
98bd7ca0 DH |
6668 | dhcpv6(struct packet *packet) { |
6669 | struct data_string reply; | |
6670 | struct sockaddr_in6 to_addr; | |
6671 | int send_ret; | |
6672 | ||
b31fe1d5 | 6673 | /* |
98bd7ca0 DH |
6674 | * Log a message that we received this packet. |
6675 | */ | |
b31fe1d5 | 6676 | log_packet_in(packet); |
98bd7ca0 DH |
6677 | |
6678 | /* | |
6679 | * Build our reply packet. | |
6680 | */ | |
6681 | build_dhcpv6_reply(&reply, packet); | |
6682 | ||
6683 | if (reply.data != NULL) { | |
b31fe1d5 | 6684 | /* |
98bd7ca0 DH |
6685 | * Send our reply, if we have one. |
6686 | */ | |
6687 | memset(&to_addr, 0, sizeof(to_addr)); | |
6688 | to_addr.sin6_family = AF_INET6; | |
b31fe1d5 | 6689 | if ((packet->dhcpv6_msg_type == DHCPV6_RELAY_FORW) || |
98bd7ca0 DH |
6690 | (packet->dhcpv6_msg_type == DHCPV6_RELAY_REPL)) { |
6691 | to_addr.sin6_port = local_port; | |
6692 | } else { | |
6693 | to_addr.sin6_port = remote_port; | |
6694 | } | |
fb30f3fc SR |
6695 | |
6696 | #if defined (REPLY_TO_SOURCE_PORT) | |
6697 | /* | |
6698 | * This appears to have been included for testing so we would | |
6699 | * not need a root client, but was accidently left in the | |
6700 | * final code. We continue to include it in case | |
6701 | * some users have come to rely upon it, but leave | |
6702 | * it off by default as it's a bad idea. | |
6703 | */ | |
98bd7ca0 | 6704 | to_addr.sin6_port = packet->client_port; |
fb30f3fc SR |
6705 | #endif |
6706 | ||
b31fe1d5 | 6707 | memcpy(&to_addr.sin6_addr, packet->client_addr.iabuf, |
98bd7ca0 DH |
6708 | sizeof(to_addr.sin6_addr)); |
6709 | ||
b31fe1d5 | 6710 | log_info("Sending %s to %s port %d", |
98bd7ca0 DH |
6711 | dhcpv6_type_names[reply.data[0]], |
6712 | piaddr(packet->client_addr), | |
6713 | ntohs(to_addr.sin6_port)); | |
6714 | ||
b31fe1d5 | 6715 | send_ret = send_packet6(packet->interface, |
98bd7ca0 DH |
6716 | reply.data, reply.len, &to_addr); |
6717 | if (send_ret != reply.len) { | |
6718 | log_error("dhcpv6: send_packet6() sent %d of %d bytes", | |
6719 | send_ret, reply.len); | |
6720 | } | |
6721 | data_string_forget(&reply, MDL); | |
6722 | } | |
6723 | } | |
6724 | ||
5279b8f3 DH |
6725 | static void |
6726 | seek_shared_host(struct host_decl **hp, struct shared_network *shared) { | |
6727 | struct host_decl *nofixed = NULL; | |
6728 | struct host_decl *seek, *hold = NULL; | |
6729 | ||
6730 | /* | |
bd72740e FD |
6731 | * Seek forward through fixed addresses for the right link. |
6732 | * | |
6733 | * Note: how to do this for fixed prefixes??? | |
5279b8f3 DH |
6734 | */ |
6735 | host_reference(&hold, *hp, MDL); | |
6736 | host_dereference(hp, MDL); | |
6737 | seek = hold; | |
6738 | while (seek != NULL) { | |
6739 | if (seek->fixed_addr == NULL) | |
6740 | nofixed = seek; | |
6741 | else if (fixed_matches_shared(seek, shared)) | |
6742 | break; | |
6743 | ||
6744 | seek = seek->n_ipaddr; | |
6745 | } | |
6746 | ||
6747 | if ((seek == NULL) && (nofixed != NULL)) | |
6748 | seek = nofixed; | |
6749 | ||
6750 | if (seek != NULL) | |
6751 | host_reference(hp, seek, MDL); | |
6752 | } | |
6753 | ||
6754 | static isc_boolean_t | |
6755 | fixed_matches_shared(struct host_decl *host, struct shared_network *shared) { | |
6756 | struct subnet *subnet; | |
6757 | struct data_string addr; | |
6758 | isc_boolean_t matched; | |
6759 | struct iaddr fixed; | |
6760 | ||
6761 | if (host->fixed_addr == NULL) | |
6762 | return ISC_FALSE; | |
6763 | ||
6764 | memset(&addr, 0, sizeof(addr)); | |
6765 | if (!evaluate_option_cache(&addr, NULL, NULL, NULL, NULL, NULL, | |
6766 | &global_scope, host->fixed_addr, MDL)) | |
6767 | return ISC_FALSE; | |
6768 | ||
6769 | if (addr.len < 16) { | |
6770 | data_string_forget(&addr, MDL); | |
6771 | return ISC_FALSE; | |
6772 | } | |
6773 | ||
6774 | fixed.len = 16; | |
6775 | memcpy(fixed.iabuf, addr.data, 16); | |
6776 | ||
6777 | matched = ISC_FALSE; | |
6778 | for (subnet = shared->subnets ; subnet != NULL ; | |
6779 | subnet = subnet->next_sibling) { | |
6780 | if (addr_eq(subnet_number(fixed, subnet->netmask), | |
6781 | subnet->net)) { | |
6782 | matched = ISC_TRUE; | |
6783 | break; | |
6784 | } | |
6785 | } | |
6786 | ||
6787 | data_string_forget(&addr, MDL); | |
6788 | return matched; | |
6789 | } | |
6790 | ||
b31fe1d5 TM |
6791 | /*! |
6792 | * | |
6793 | * \brief Constructs a REPLY with status of UseMulticast to a given packet | |
6794 | * | |
6795 | * Per RFC 3315 Secs 18.2.1,3,6 & 7, when a server rejects a client's | |
6796 | * unicast-sent packet, the response must only contain the client id, | |
6797 | * server id, and a status code option of 5 (UseMulticast). This function | |
6798 | * constructs such a packet and returns it as a data_string. | |
6799 | * | |
6800 | * \param reply_ret = data_string which will receive the newly constructed | |
6801 | * reply | |
6802 | * \param packet = client request which is being rejected | |
6803 | * \param client_id = data_string which contains the client id | |
6804 | * \param server_id = data_string which which contains the server id | |
6805 | * | |
6806 | */ | |
6807 | void | |
6808 | unicast_reject(struct data_string *reply_ret, | |
6809 | struct packet *packet, | |
6810 | const struct data_string *client_id, | |
6811 | const struct data_string *server_id) | |
6812 | { | |
6813 | struct reply_state reply; | |
6814 | memset(&reply, 0x0, sizeof(struct reply_state)); | |
6815 | ||
6816 | /* Locate the client. */ | |
6817 | if (shared_network_from_packet6(&reply.shared, packet) | |
6818 | != ISC_R_SUCCESS) { | |
6819 | log_error("unicast_reject: could not locate client."); | |
6820 | return; | |
6821 | } | |
6822 | ||
6823 | /* Initialize the reply. */ | |
6824 | packet_reference(&reply.packet, packet, MDL); | |
6825 | data_string_copy(&reply.client_id, client_id, MDL); | |
6826 | ||
6827 | if (start_reply(packet, client_id, server_id, &reply.opt_state, | |
6828 | &reply.buf.reply)) { | |
6829 | /* Set the UseMulticast status code. */ | |
6830 | if (!set_status_code(STATUS_UseMulticast, | |
6831 | "Unicast not allowed by server.", | |
6832 | reply.opt_state)) { | |
6833 | log_error("unicast_reject: Unable to set status code."); | |
6834 | } else { | |
6835 | /* Set write cursor to just past the reply header. */ | |
6836 | reply.cursor = REPLY_OPTIONS_INDEX; | |
6837 | reply.cursor += store_options6(((char *)reply.buf.data | |
6838 | + reply.cursor), | |
6839 | (sizeof(reply.buf) | |
6840 | - reply.cursor), | |
6841 | reply.opt_state, | |
6842 | reply.packet, | |
6843 | unicast_reject_opts, | |
6844 | NULL); | |
6845 | ||
6846 | /* Return our reply to the caller. */ | |
6847 | reply_ret->len = reply.cursor; | |
6848 | reply_ret->buffer = NULL; | |
6849 | if (!buffer_allocate(&reply_ret->buffer, | |
6850 | reply.cursor, MDL)) { | |
6851 | log_fatal("unicast_reject:" | |
6852 | "No memory to store Reply."); | |
6853 | } | |
6854 | ||
6855 | memcpy(reply_ret->buffer->data, reply.buf.data, | |
6856 | reply.cursor); | |
6857 | reply_ret->data = reply_ret->buffer->data; | |
6858 | } | |
6859 | ||
6860 | } | |
6861 | ||
6862 | /* Cleanup. */ | |
6863 | if (reply.shared != NULL) | |
6864 | shared_network_dereference(&reply.shared, MDL); | |
6865 | if (reply.opt_state != NULL) | |
6866 | option_state_dereference(&reply.opt_state, MDL); | |
6867 | if (reply.packet != NULL) | |
6868 | packet_dereference(&reply.packet, MDL); | |
6869 | if (reply.client_id.data != NULL) | |
6870 | data_string_forget(&reply.client_id, MDL); | |
6871 | } | |
6872 | ||
6873 | /*! | |
6874 | * | |
6875 | * \brief Checks if the dhcp6.unicast option has been defined | |
6876 | * | |
6877 | * Scans the option space for the presence of the dhcp6.unicast option. The | |
6878 | * function attempts to map the inbound packet to a shared network first | |
6879 | * by an ip address specified via an D6O_IA_XX option and if that fails then | |
6880 | * by the packet's source information (e.g. relay link, link, or interace). | |
6881 | * Once the packet is mapped to a shared network, the function executes all | |
6882 | * statements from the network's group outward into a local option cache. | |
6883 | * The option cache is then scanned for the presence of unicast option. If | |
6884 | * the packet cannot be mapped to a shared network, the function returns | |
6885 | * ISC_FALSE. | |
6886 | * \param packet inbound packet from the client | |
6887 | * | |
6888 | * \return ISC_TRUE if the dhcp6.unicast option is defined, false otherwise. | |
6889 | * | |
6890 | */ | |
6891 | isc_boolean_t | |
6892 | is_unicast_option_defined(struct packet *packet) { | |
6893 | isc_boolean_t is_defined = ISC_FALSE; | |
6894 | struct option_state *opt_state = NULL; | |
6895 | struct option_cache *oc = NULL; | |
6896 | struct shared_network *shared = NULL; | |
6897 | ||
6898 | if (!option_state_allocate(&opt_state, MDL)) { | |
6899 | log_fatal("is_unicast_option_defined:" | |
6900 | "No memory for option state."); | |
6901 | } | |
6902 | ||
6903 | /* We try to map the packet to a network first by an IA_XX value. | |
6904 | * If that fails, we try by packet source. */ | |
6905 | if (((shared_network_from_requested_addr(&shared, packet) | |
6906 | != ISC_R_SUCCESS) && | |
6907 | (shared_network_from_packet6(&shared, packet) != ISC_R_SUCCESS)) | |
6908 | || (shared == NULL)) { | |
6909 | /* @todo what would this really mean? I think wrong network | |
6910 | * logic will catch it */ | |
6911 | log_error("is_unicast_option_defined:" | |
6912 | "cannot attribute packet to a network."); | |
6913 | return (ISC_FALSE); | |
6914 | } | |
6915 | ||
6916 | /* Now that we've mapped it to a network, execute statments to that | |
6917 | * scope, looking for the unicast option. We don't care about the | |
6918 | * value of the option, only whether or not it is defined. */ | |
6919 | execute_statements_in_scope(NULL, NULL, NULL, NULL, NULL, opt_state, | |
6920 | &global_scope, shared->group, NULL, NULL); | |
6921 | ||
6922 | oc = lookup_option(&dhcpv6_universe, opt_state, D6O_UNICAST); | |
6923 | is_defined = (oc != NULL ? ISC_TRUE : ISC_FALSE); | |
6924 | log_debug("is_unicast_option_defined: option found : %d", is_defined); | |
6925 | ||
6926 | if (shared != NULL) { | |
6927 | shared_network_dereference(&shared, MDL); | |
6928 | } | |
6929 | ||
6930 | if (opt_state != NULL) { | |
6931 | option_state_dereference(&opt_state, MDL); | |
6932 | } | |
6933 | ||
6934 | return (is_defined); | |
6935 | } | |
6936 | ||
6937 | /*! | |
6938 | * | |
6939 | * \brief Maps a packet to a shared network based on the requested IP address | |
6940 | * | |
6941 | * The function attempts to find a subnet that matches the first requested IP | |
6942 | * address contained within the given packet. Note that it looks first for | |
6943 | * D6O_IA_NAs, then D6O_IA_PDs and lastly D6O_IA_TAs. If a matching network is | |
6944 | * found, a reference to it is returned in the parameter, shared. | |
6945 | * | |
6946 | * \param shared shared_network pointer which will receive the matching network | |
6947 | * \param packet inbound packet from the client | |
6948 | * | |
6949 | * \return ISC_R_SUCCESS if the packet can be mapped to a shared_network. | |
6950 | * | |
6951 | */ | |
6952 | static isc_result_t | |
6953 | shared_network_from_requested_addr (struct shared_network **shared, | |
6954 | struct packet* packet) { | |
6955 | struct iaddr iaddr; | |
6956 | struct subnet* subnet = NULL; | |
6957 | isc_result_t status = ISC_R_FAILURE; | |
6958 | ||
6959 | /* Try to match first IA_ address or prefix we find to a subnet. In | |
6960 | * theory all IA_ values in a given request are supposed to be in the | |
6961 | * same subnet so we only need to try one right? */ | |
6962 | if ((get_first_ia_addr_val(packet, D6O_IA_NA, &iaddr) != ISC_R_SUCCESS) | |
6963 | && (get_first_ia_addr_val(packet, D6O_IA_PD, &iaddr) | |
6964 | != ISC_R_SUCCESS) | |
6965 | && (get_first_ia_addr_val(packet, D6O_IA_TA, &iaddr) | |
6966 | != ISC_R_SUCCESS)) { | |
6967 | /* we found nothing to match against */ | |
6968 | log_debug("share_network_from_request_addr: nothing to match"); | |
6969 | return (ISC_R_FAILURE); | |
6970 | } | |
6971 | ||
6972 | if (!find_subnet(&subnet, iaddr, MDL)) { | |
6973 | log_debug("shared_network_from_requested_addr:" | |
6974 | "No subnet found for addr %s.", piaddr(iaddr)); | |
6975 | } else { | |
6976 | status = shared_network_reference(shared, | |
6977 | subnet->shared_network, MDL); | |
6978 | subnet_dereference(&subnet, MDL); | |
6979 | log_debug("shared_network_from_requested_addr:" | |
6980 | " found shared network %s for address %s.", | |
6981 | ((*shared)->name ? (*shared)->name : "unnamed"), | |
6982 | piaddr(iaddr)); | |
6983 | return (status); | |
6984 | } | |
6985 | ||
6986 | return (ISC_R_FAILURE); | |
6987 | } | |
6988 | ||
6989 | /*! | |
6990 | * | |
6991 | * \brief Retrieves the first IP address from a given packet of a given type | |
6992 | * | |
6993 | * Search a packet for options of a given type (D6O_IA_AN, D6O_IA_PD, or | |
6994 | * D6O_IA_TA) for the first non-blank IA_XX value and return its IP address | |
6995 | * component. | |
6996 | * | |
6997 | * \param packet packet received from the client | |
6998 | * \param addr_type the address option type (D6O_IA_NA , D6O_IA_PD, or | |
6999 | * D6O_IP_TA) to look for within the packet. | |
7000 | * \param iaddr pointer to the iaddr structure which will receive the extracted | |
7001 | * address. | |
7002 | * | |
7003 | * \return ISC_R_SUCCESS if an address was succesfully extracted, ISC_R_FALURE | |
7004 | * otherwise. | |
7005 | * | |
7006 | */ | |
7007 | static isc_result_t | |
7008 | get_first_ia_addr_val (struct packet* packet, int addr_type, | |
7009 | struct iaddr* iaddr) { | |
7010 | struct option_cache *ia; | |
7011 | struct option_cache *oc = NULL; | |
7012 | struct data_string cli_enc_opt_data; | |
7013 | struct option_state *cli_enc_opt_state; | |
7014 | int addr_opt_offset; | |
7015 | int addr_opt; | |
7016 | int addr_opt_data_len; | |
7017 | int ip_addr_offset; | |
7018 | ||
7019 | isc_result_t status = ISC_R_FAILURE; | |
7020 | memset(iaddr, 0, sizeof(struct iaddr)); | |
7021 | ||
7022 | /* Set up address type specifics */ | |
7023 | switch (addr_type) { | |
7024 | case D6O_IA_NA: | |
7025 | addr_opt_offset = IA_NA_OFFSET; | |
7026 | addr_opt = D6O_IAADDR; | |
7027 | addr_opt_data_len = 24; | |
7028 | ip_addr_offset = 0; | |
7029 | break; | |
7030 | case D6O_IA_TA: | |
7031 | addr_opt_offset = IA_TA_OFFSET; | |
7032 | addr_opt = D6O_IAADDR; | |
7033 | addr_opt_data_len = 24; | |
7034 | ip_addr_offset = 0; | |
7035 | break; | |
7036 | case D6O_IA_PD: | |
7037 | addr_opt_offset = IA_PD_OFFSET; | |
7038 | addr_opt = D6O_IAPREFIX; | |
7039 | addr_opt_data_len = 25; | |
7040 | ip_addr_offset = 9; | |
7041 | break; | |
7042 | default: | |
7043 | /* shouldn't be here */ | |
7044 | log_error ("get_first_ia_addr_val: invalid opt type %d", | |
7045 | addr_type); | |
7046 | return (ISC_R_FAILURE); | |
7047 | } | |
7048 | ||
7049 | /* Find the first, non-blank IA_XX value within an D6O_IA_XX option. */ | |
7050 | for (ia = lookup_option(&dhcpv6_universe, packet->options, addr_type); | |
7051 | ia != NULL && oc == NULL; ia = ia->next) { | |
b31fe1d5 TM |
7052 | if (!get_encapsulated_IA_state(&cli_enc_opt_state, |
7053 | &cli_enc_opt_data, | |
7054 | packet, ia, addr_opt_offset)) { | |
7055 | log_debug ("get_first_ia_addr_val:" | |
7056 | " couldn't unroll enclosing option"); | |
7057 | return (ISC_R_FAILURE); | |
7058 | } | |
7059 | ||
b31fe1d5 TM |
7060 | oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, |
7061 | addr_opt); | |
7062 | if (oc == NULL) { | |
7063 | /* no address given for this IA, ignore */ | |
7064 | option_state_dereference(&cli_enc_opt_state, MDL); | |
7065 | data_string_forget(&cli_enc_opt_data, MDL); | |
7066 | } | |
7067 | } | |
7068 | ||
7069 | /* If we found a non-blank IA_XX then extract its ip address. */ | |
7070 | if (oc != NULL) { | |
7071 | struct data_string iaddr_str; | |
7072 | ||
7073 | memset(&iaddr_str, 0, sizeof(iaddr_str)); | |
7074 | if (!evaluate_option_cache(&iaddr_str, packet, NULL, NULL, | |
7075 | packet->options, NULL, &global_scope, | |
7076 | oc, MDL)) { | |
7077 | log_error("get_first_ia_addr_val: " | |
7078 | "error evaluating IA_XX option."); | |
7079 | } else { | |
7080 | if (iaddr_str.len != addr_opt_data_len) { | |
7081 | log_error("shared_network_from_requested_addr:" | |
7082 | " invalid length %d, expected %d", | |
7083 | iaddr_str.len, addr_opt_data_len); | |
7084 | } else { | |
7085 | iaddr->len = 16; | |
7086 | memcpy (iaddr->iabuf, | |
7087 | iaddr_str.data + ip_addr_offset, 16); | |
7088 | status = ISC_R_SUCCESS; | |
7089 | } | |
7090 | data_string_forget(&iaddr_str, MDL); | |
7091 | } | |
7092 | ||
7093 | option_state_dereference(&cli_enc_opt_state, MDL); | |
7094 | data_string_forget(&cli_enc_opt_data, MDL); | |
7095 | } | |
7096 | ||
7097 | return (status); | |
7098 | } | |
7099 | ||
dce576b8 TM |
7100 | /* |
7101 | * \brief Calculates the reply T1/T2 times and stuffs them in outbound buffer | |
7102 | * | |
7103 | * T1/T2 time selection is kind of weird. We actually use DHCP * (v4) scoped | |
7104 | * options, dhcp-renewal-time and dhcp-rebinding-time, as handy existing places | |
7105 | * where these can be configured by an administrator. A value of zero tells the | |
7106 | * client it may choose its own value. | |
7107 | * | |
7108 | * When those options are not defined, the values will be set to zero unless | |
7109 | * the global option, dhcpv6-set-tee-times is enabled. When this option is | |
7110 | * enabled the values are calculated as recommended by RFC 3315, Section 22.4: | |
7111 | * | |
7112 | * T1 will be set to 0.5 times the shortest preferred lifetime | |
7113 | * in the IA_XX option. If the "shortest" preferred lifetime is | |
7114 | * 0xFFFFFFFF, T1 will set to 0xFFFFFFFF. | |
7115 | * | |
7116 | * T2 will be set to 0.8 times the shortest preferred lifetime | |
7117 | * in the IA_XX option. If the "shortest" preferred lifetime is | |
7118 | * 0xFFFFFFFF, T2 will set to 0xFFFFFFFF. | |
7119 | * | |
7120 | * Note that dhcpv6-set-tee-times is intended to be transitional and will | |
7121 | * likely be removed in 4.4.0, leaving the behavior as getting the values | |
7122 | * either from the configured parameters (if you want zeros, define them as | |
7123 | * zeros) or by calculating them per the RFC. | |
7124 | * | |
7125 | * \param reply - pointer to the reply_state structure | |
7126 | * \param ia_cursor - offset of the beginning of the IA_XX option within the | |
7127 | * reply's outbound data buffer | |
7128 | */ | |
7129 | static void | |
7130 | set_reply_tee_times(struct reply_state* reply, unsigned ia_cursor) | |
7131 | { | |
7132 | struct option_cache *oc; | |
7133 | int set_tee_times; | |
7134 | ||
7135 | /* Found out if calculated values are enabled. */ | |
7136 | oc = lookup_option(&server_universe, reply->opt_state, | |
7137 | SV_DHCPV6_SET_TEE_TIMES); | |
7138 | set_tee_times = (oc && | |
7139 | evaluate_boolean_option_cache(NULL, reply->packet, | |
7140 | NULL, NULL, | |
7141 | reply->packet->options, | |
7142 | reply->opt_state, | |
7143 | &global_scope, oc, MDL)); | |
7144 | ||
7145 | oc = lookup_option(&dhcp_universe, reply->opt_state, | |
7146 | DHO_DHCP_RENEWAL_TIME); | |
7147 | if (oc != NULL) { | |
7148 | /* dhcp-renewal-time is defined, use it */ | |
7149 | struct data_string data; | |
7150 | memset(&data, 0x00, sizeof(data)); | |
7151 | ||
7152 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
7153 | reply->packet->options, | |
7154 | reply->opt_state, &global_scope, | |
7155 | oc, MDL) || | |
7156 | (data.len != 4)) { | |
7157 | log_error("Invalid renewal time."); | |
7158 | reply->renew = 0; | |
7159 | } else { | |
7160 | reply->renew = getULong(data.data); | |
7161 | } | |
7162 | ||
7163 | if (data.data != NULL) | |
7164 | data_string_forget(&data, MDL); | |
7165 | } else if (set_tee_times) { | |
7166 | /* Setting them is enabled so T1 is either infinite or | |
7167 | * 0.5 * the shortest preferred lifetime in the IA_XX */ | |
7168 | reply->renew = (reply->min_prefer == 0xFFFFFFFF ? 0xFFFFFFFF | |
7169 | : reply->min_prefer / 2); | |
7170 | } else { | |
7171 | /* Default is to let the client choose */ | |
7172 | reply->renew = 0; | |
7173 | } | |
7174 | ||
7175 | putULong(reply->buf.data + ia_cursor + 8, reply->renew); | |
7176 | ||
7177 | /* Now T2. */ | |
7178 | oc = lookup_option(&dhcp_universe, reply->opt_state, | |
7179 | DHO_DHCP_REBINDING_TIME); | |
7180 | if (oc != NULL) { | |
7181 | /* dhcp-rebinding-time is defined, use it */ | |
7182 | struct data_string data; | |
7183 | memset(&data, 0x00, sizeof(data)); | |
7184 | ||
7185 | if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, | |
7186 | reply->packet->options, | |
7187 | reply->opt_state, &global_scope, | |
7188 | oc, MDL) || | |
7189 | (data.len != 4)) { | |
7190 | log_error("Invalid rebinding time."); | |
7191 | reply->rebind = 0; | |
7192 | } else { | |
7193 | reply->rebind = getULong(data.data); | |
7194 | } | |
7195 | ||
7196 | if (data.data != NULL) | |
7197 | data_string_forget(&data, MDL); | |
7198 | } else if (set_tee_times) { | |
7199 | /* Setting them is enabled so T2 is either infinite or | |
7200 | * 0.8 * the shortest preferred lifetime in the reply */ | |
7201 | reply->rebind = (reply->min_prefer == 0xFFFFFFFF ? 0xFFFFFFFF | |
7202 | : (reply->min_prefer / 5) * 4); | |
7203 | } else { | |
7204 | /* Default is to let the client choose */ | |
7205 | reply->rebind = 0; | |
7206 | } | |
7207 | ||
7208 | putULong(reply->buf.data + ia_cursor + 12, reply->rebind); | |
7209 | } | |
7210 | ||
7211 | ||
fe5b0fdd | 7212 | #endif /* DHCPv6 */ |