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conf-files: include the expected suffix in the 'unexpected suffix' debug message.
[thirdparty/systemd.git] / src / libsystemd-network / dhcp6-option.c
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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/***
3 Copyright © 2014-2015 Intel Corporation. All rights reserved.
4***/
5
6#include <netinet/in.h>
7
8#include "sd-dhcp6-client.h"
9#include "sd-dhcp6-option.h"
10
11#include "alloc-util.h"
12#include "dhcp6-internal.h"
13#include "dhcp6-option.h"
14#include "dhcp6-protocol.h"
15#include "dns-def.h"
16#include "dns-domain.h"
17#include "escape.h"
18#include "memory-util.h"
19#include "network-common.h"
20#include "ordered-set.h"
21#include "string-util.h"
22#include "strv.h"
23#include "unaligned.h"
24
25#define DHCP6_OPTION_IA_NA_LEN (sizeof(struct ia_na))
26#define DHCP6_OPTION_IA_PD_LEN (sizeof(struct ia_pd))
27#define DHCP6_OPTION_IA_TA_LEN (sizeof(struct ia_ta))
28
29bool dhcp6_option_can_request(uint16_t option) {
30 /* See Client ORO field in
31 * https://www.iana.org/assignments/dhcpv6-parameters/dhcpv6-parameters.xhtml#dhcpv6-parameters-2 */
32
33 switch (option) {
34 case SD_DHCP6_OPTION_CLIENTID:
35 case SD_DHCP6_OPTION_SERVERID:
36 case SD_DHCP6_OPTION_IA_NA:
37 case SD_DHCP6_OPTION_IA_TA:
38 case SD_DHCP6_OPTION_IAADDR:
39 case SD_DHCP6_OPTION_ORO:
40 case SD_DHCP6_OPTION_PREFERENCE:
41 case SD_DHCP6_OPTION_ELAPSED_TIME:
42 case SD_DHCP6_OPTION_RELAY_MSG:
43 case SD_DHCP6_OPTION_AUTH:
44 case SD_DHCP6_OPTION_UNICAST:
45 case SD_DHCP6_OPTION_STATUS_CODE:
46 case SD_DHCP6_OPTION_RAPID_COMMIT:
47 case SD_DHCP6_OPTION_USER_CLASS:
48 case SD_DHCP6_OPTION_VENDOR_CLASS:
49 return false;
50 case SD_DHCP6_OPTION_VENDOR_OPTS:
51 return true;
52 case SD_DHCP6_OPTION_INTERFACE_ID:
53 case SD_DHCP6_OPTION_RECONF_MSG:
54 case SD_DHCP6_OPTION_RECONF_ACCEPT:
55 return false;
56 case SD_DHCP6_OPTION_SIP_SERVER_DOMAIN_NAME:
57 case SD_DHCP6_OPTION_SIP_SERVER_ADDRESS:
58 case SD_DHCP6_OPTION_DNS_SERVER:
59 case SD_DHCP6_OPTION_DOMAIN:
60 return true;
61 case SD_DHCP6_OPTION_IA_PD:
62 case SD_DHCP6_OPTION_IA_PD_PREFIX:
63 return false;
64 case SD_DHCP6_OPTION_NIS_SERVER:
65 case SD_DHCP6_OPTION_NISP_SERVER:
66 case SD_DHCP6_OPTION_NIS_DOMAIN_NAME:
67 case SD_DHCP6_OPTION_NISP_DOMAIN_NAME:
68 case SD_DHCP6_OPTION_SNTP_SERVER:
69 return true;
70 case SD_DHCP6_OPTION_INFORMATION_REFRESH_TIME:
71 return false; /* This is automatically set when sending INFORMATION_REQUEST message. */
72 case SD_DHCP6_OPTION_BCMCS_SERVER_D:
73 case SD_DHCP6_OPTION_BCMCS_SERVER_A:
74 case SD_DHCP6_OPTION_GEOCONF_CIVIC:
75 return true;
76 case SD_DHCP6_OPTION_REMOTE_ID:
77 case SD_DHCP6_OPTION_SUBSCRIBER_ID:
78 return false;
79 case SD_DHCP6_OPTION_CLIENT_FQDN:
80 case SD_DHCP6_OPTION_PANA_AGENT:
81 case SD_DHCP6_OPTION_POSIX_TIMEZONE:
82 case SD_DHCP6_OPTION_TZDB_TIMEZONE:
83 return true;
84 case SD_DHCP6_OPTION_ERO:
85 case SD_DHCP6_OPTION_LQ_QUERY:
86 case SD_DHCP6_OPTION_CLIENT_DATA:
87 case SD_DHCP6_OPTION_CLT_TIME:
88 case SD_DHCP6_OPTION_LQ_RELAY_DATA:
89 case SD_DHCP6_OPTION_LQ_CLIENT_LINK:
90 return false;
91 case SD_DHCP6_OPTION_MIP6_HNIDF:
92 case SD_DHCP6_OPTION_MIP6_VDINF:
93 case SD_DHCP6_OPTION_V6_LOST:
94 case SD_DHCP6_OPTION_CAPWAP_AC_V6:
95 return true;
96 case SD_DHCP6_OPTION_RELAY_ID:
97 return false;
98 case SD_DHCP6_OPTION_IPV6_ADDRESS_MOS:
99 case SD_DHCP6_OPTION_IPV6_FQDN_MOS:
100 case SD_DHCP6_OPTION_NTP_SERVER:
101 case SD_DHCP6_OPTION_V6_ACCESS_DOMAIN:
102 case SD_DHCP6_OPTION_SIP_UA_CS_LIST:
103 case SD_DHCP6_OPTION_BOOTFILE_URL:
104 case SD_DHCP6_OPTION_BOOTFILE_PARAM:
105 return true;
106 case SD_DHCP6_OPTION_CLIENT_ARCH_TYPE:
107 return false;
108 case SD_DHCP6_OPTION_NII:
109 case SD_DHCP6_OPTION_GEOLOCATION:
110 case SD_DHCP6_OPTION_AFTR_NAME:
111 case SD_DHCP6_OPTION_ERP_LOCAL_DOMAIN_NAME:
112 return true;
113 case SD_DHCP6_OPTION_RSOO:
114 return false;
115 case SD_DHCP6_OPTION_PD_EXCLUDE:
116 return true;
117 case SD_DHCP6_OPTION_VSS:
118 return false;
119 case SD_DHCP6_OPTION_MIP6_IDINF:
120 case SD_DHCP6_OPTION_MIP6_UDINF:
121 case SD_DHCP6_OPTION_MIP6_HNP:
122 case SD_DHCP6_OPTION_MIP6_HAA:
123 case SD_DHCP6_OPTION_MIP6_HAF:
124 case SD_DHCP6_OPTION_RDNSS_SELECTION:
125 case SD_DHCP6_OPTION_KRB_PRINCIPAL_NAME:
126 case SD_DHCP6_OPTION_KRB_REALM_NAME:
127 case SD_DHCP6_OPTION_KRB_DEFAULT_REALM_NAME:
128 case SD_DHCP6_OPTION_KRB_KDC:
129 return true;
130 case SD_DHCP6_OPTION_CLIENT_LINKLAYER_ADDR:
131 case SD_DHCP6_OPTION_LINK_ADDRESS:
132 case SD_DHCP6_OPTION_RADIUS:
133 case SD_DHCP6_OPTION_SOL_MAX_RT: /* Automatically set when sending SOLICIT message. */
134 case SD_DHCP6_OPTION_INF_MAX_RT: /* Automatically set when sending INFORMATION_REQUEST message. */
135 return false;
136 case SD_DHCP6_OPTION_ADDRSEL:
137 case SD_DHCP6_OPTION_ADDRSEL_TABLE:
138 case SD_DHCP6_OPTION_V6_PCP_SERVER:
139 return true;
140 case SD_DHCP6_OPTION_DHCPV4_MSG:
141 return false;
142 case SD_DHCP6_OPTION_DHCP4_O_DHCP6_SERVER:
143 return true;
144 case SD_DHCP6_OPTION_S46_RULE:
145 return false;
146 case SD_DHCP6_OPTION_S46_BR:
147 return true;
148 case SD_DHCP6_OPTION_S46_DMR:
149 case SD_DHCP6_OPTION_S46_V4V6BIND:
150 case SD_DHCP6_OPTION_S46_PORTPARAMS:
151 return false;
152 case SD_DHCP6_OPTION_S46_CONT_MAPE:
153 case SD_DHCP6_OPTION_S46_CONT_MAPT:
154 case SD_DHCP6_OPTION_S46_CONT_LW:
155 case SD_DHCP6_OPTION_4RD:
156 case SD_DHCP6_OPTION_4RD_MAP_RULE:
157 case SD_DHCP6_OPTION_4RD_NON_MAP_RULE:
158 return true;
159 case SD_DHCP6_OPTION_LQ_BASE_TIME:
160 case SD_DHCP6_OPTION_LQ_START_TIME:
161 case SD_DHCP6_OPTION_LQ_END_TIME:
162 return false;
163 case SD_DHCP6_OPTION_CAPTIVE_PORTAL:
164 case SD_DHCP6_OPTION_MPL_PARAMETERS:
165 return true;
166 case SD_DHCP6_OPTION_ANI_ATT:
167 case SD_DHCP6_OPTION_ANI_NETWORK_NAME:
168 case SD_DHCP6_OPTION_ANI_AP_NAME:
169 case SD_DHCP6_OPTION_ANI_AP_BSSID:
170 case SD_DHCP6_OPTION_ANI_OPERATOR_ID:
171 case SD_DHCP6_OPTION_ANI_OPERATOR_REALM:
172 return false;
173 case SD_DHCP6_OPTION_S46_PRIORITY:
174 return true;
175 case SD_DHCP6_OPTION_MUD_URL_V6:
176 return false;
177 case SD_DHCP6_OPTION_V6_PREFIX64:
178 return true;
179 case SD_DHCP6_OPTION_F_BINDING_STATUS:
180 case SD_DHCP6_OPTION_F_CONNECT_FLAGS:
181 case SD_DHCP6_OPTION_F_DNS_REMOVAL_INFO:
182 case SD_DHCP6_OPTION_F_DNS_HOST_NAME:
183 case SD_DHCP6_OPTION_F_DNS_ZONE_NAME:
184 case SD_DHCP6_OPTION_F_DNS_FLAGS:
185 case SD_DHCP6_OPTION_F_EXPIRATION_TIME:
186 case SD_DHCP6_OPTION_F_MAX_UNACKED_BNDUPD:
187 case SD_DHCP6_OPTION_F_MCLT:
188 case SD_DHCP6_OPTION_F_PARTNER_LIFETIME:
189 case SD_DHCP6_OPTION_F_PARTNER_LIFETIME_SENT:
190 case SD_DHCP6_OPTION_F_PARTNER_DOWN_TIME:
191 case SD_DHCP6_OPTION_F_PARTNER_RAW_CLT_TIME:
192 case SD_DHCP6_OPTION_F_PROTOCOL_VERSION:
193 case SD_DHCP6_OPTION_F_KEEPALIVE_TIME:
194 case SD_DHCP6_OPTION_F_RECONFIGURE_DATA:
195 case SD_DHCP6_OPTION_F_RELATIONSHIP_NAME:
196 case SD_DHCP6_OPTION_F_SERVER_FLAGS:
197 case SD_DHCP6_OPTION_F_SERVER_STATE:
198 case SD_DHCP6_OPTION_F_START_TIME_OF_STATE:
199 case SD_DHCP6_OPTION_F_STATE_EXPIRATION_TIME:
200 case SD_DHCP6_OPTION_RELAY_PORT:
201 return false;
202 case SD_DHCP6_OPTION_V6_SZTP_REDIRECT:
203 case SD_DHCP6_OPTION_S46_BIND_IPV6_PREFIX:
204 return true;
205 case SD_DHCP6_OPTION_IA_LL:
206 case SD_DHCP6_OPTION_LLADDR:
207 case SD_DHCP6_OPTION_SLAP_QUAD:
208 return false;
209 case SD_DHCP6_OPTION_V6_DOTS_RI:
210 case SD_DHCP6_OPTION_V6_DOTS_ADDRESS:
211 case SD_DHCP6_OPTION_IPV6_ADDRESS_ANDSF:
212 case SD_DHCP6_OPTION_V6_DNR:
213 case SD_DHCP6_OPTION_REGISTERED_DOMAIN:
214 case SD_DHCP6_OPTION_FORWARD_DIST_MANAGER:
215 case SD_DHCP6_OPTION_REVERSE_DIST_MANAGER:
216 case SD_DHCP6_OPTION_ADDR_REG_ENABLE:
217 return true;
218 default:
219 return false;
220 }
221}
222
223static int option_append_hdr(uint8_t **buf, size_t *offset, uint16_t optcode, size_t optlen) {
224 assert(buf);
225 assert(*buf);
226 assert(offset);
227
228 if (optlen > 0xffff)
229 return -ENOBUFS;
230
231 if (optlen + offsetof(DHCP6Option, data) > SIZE_MAX - *offset)
232 return -ENOBUFS;
233
234 if (!GREEDY_REALLOC(*buf, *offset + optlen + offsetof(DHCP6Option, data)))
235 return -ENOMEM;
236
237 unaligned_write_be16(*buf + *offset + offsetof(DHCP6Option, code), optcode);
238 unaligned_write_be16(*buf + *offset + offsetof(DHCP6Option, len), optlen);
239
240 *offset += offsetof(DHCP6Option, data);
241 return 0;
242}
243
244int dhcp6_option_append(
245 uint8_t **buf,
246 size_t *offset,
247 uint16_t code,
248 size_t optlen,
249 const void *optval) {
250
251 int r;
252
253 assert(optval || optlen == 0);
254
255 r = option_append_hdr(buf, offset, code, optlen);
256 if (r < 0)
257 return r;
258
259 memcpy_safe(*buf + *offset, optval, optlen);
260 *offset += optlen;
261
262 return 0;
263}
264
265int dhcp6_option_append_vendor_option(uint8_t **buf, size_t *offset, OrderedSet *vendor_options) {
266 sd_dhcp6_option *options;
267 int r;
268
269 assert(buf);
270 assert(*buf);
271 assert(offset);
272
273 ORDERED_SET_FOREACH(options, vendor_options) {
274 _cleanup_free_ uint8_t *p = NULL;
275 size_t total;
276
277 total = 4 + 2 + 2 + options->length;
278
279 p = malloc(total);
280 if (!p)
281 return -ENOMEM;
282
283 unaligned_write_be32(p, options->enterprise_identifier);
284 unaligned_write_be16(p + 4, options->option);
285 unaligned_write_be16(p + 6, options->length);
286 memcpy(p + 8, options->data, options->length);
287
288 r = dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_VENDOR_OPTS, total, p);
289 if (r < 0)
290 return r;
291 }
292
293 return 0;
294}
295
296static int option_append_ia_address(uint8_t **buf, size_t *offset, const struct iaaddr *address) {
297 assert(buf);
298 assert(*buf);
299 assert(offset);
300 assert(address);
301
302 /* Do not append T1 and T2. */
303 const struct iaaddr a = {
304 .address = address->address,
305 };
306
307 return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_IAADDR, sizeof(struct iaaddr), &a);
308}
309
310static int option_append_pd_prefix(uint8_t **buf, size_t *offset, const struct iapdprefix *prefix) {
311 assert(buf);
312 assert(*buf);
313 assert(offset);
314 assert(prefix);
315
316 if (prefix->prefixlen == 0)
317 return -EINVAL;
318
319 /* Do not append T1 and T2. */
320 const struct iapdprefix p = {
321 .prefixlen = prefix->prefixlen,
322 .address = prefix->address,
323 };
324
325 return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_IA_PD_PREFIX, sizeof(struct iapdprefix), &p);
326}
327
328int dhcp6_option_append_ia(uint8_t **buf, size_t *offset, const DHCP6IA *ia) {
329 _cleanup_free_ uint8_t *data = NULL;
330 struct ia_header header;
331 size_t len;
332 int r;
333
334 assert(buf);
335 assert(*buf);
336 assert(offset);
337 assert(ia);
338
339 /* client should not send set T1 and T2. See, RFC 8415, and issue #18090. */
340
341 switch (ia->type) {
342 case SD_DHCP6_OPTION_IA_NA:
343 case SD_DHCP6_OPTION_IA_PD:
344 len = sizeof(struct ia_header);
345 header = (struct ia_header) {
346 .id = ia->header.id,
347 };
348 break;
349
350 case SD_DHCP6_OPTION_IA_TA:
351 len = sizeof(header.id); /* IA_TA does not have lifetime. */
352 header = (struct ia_header) {
353 .id = ia->header.id,
354 };
355 break;
356
357 default:
358 assert_not_reached();
359 }
360
361 if (!GREEDY_REALLOC(data, len))
362 return -ENOMEM;
363
364 memcpy(data, &header, len);
365
366 LIST_FOREACH(addresses, addr, ia->addresses) {
367 if (ia->type == SD_DHCP6_OPTION_IA_PD)
368 r = option_append_pd_prefix(&data, &len, &addr->iapdprefix);
369 else
370 r = option_append_ia_address(&data, &len, &addr->iaaddr);
371 if (r < 0)
372 return r;
373 }
374
375 return dhcp6_option_append(buf, offset, ia->type, len, data);
376}
377
378int dhcp6_option_append_fqdn(uint8_t **buf, size_t *offset, const char *fqdn) {
379 uint8_t buffer[1 + DNS_WIRE_FORMAT_HOSTNAME_MAX];
380 int r;
381
382 assert(buf);
383 assert(*buf);
384 assert(offset);
385
386 if (isempty(fqdn))
387 return 0;
388
389 buffer[0] = DHCP6_FQDN_FLAG_S; /* Request server to perform AAAA RR DNS updates */
390
391 /* Store domain name after flags field */
392 r = dns_name_to_wire_format(fqdn, buffer + 1, sizeof(buffer) - 1, false);
393 if (r <= 0)
394 return r;
395
396 /*
397 * According to RFC 4704, chapter 4.2 only add terminating zero-length
398 * label in case a FQDN is provided. Since dns_name_to_wire_format
399 * always adds terminating zero-length label remove if only a hostname
400 * is provided.
401 */
402 if (dns_name_is_single_label(fqdn))
403 r--;
404
405 return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_CLIENT_FQDN, 1 + r, buffer);
406}
407
408int dhcp6_option_append_user_class(uint8_t **buf, size_t *offset, char * const *user_class) {
409 _cleanup_free_ uint8_t *p = NULL;
410 size_t n = 0;
411
412 assert(buf);
413 assert(*buf);
414 assert(offset);
415
416 if (strv_isempty(user_class))
417 return 0;
418
419 STRV_FOREACH(s, user_class) {
420 size_t len = strlen(*s);
421
422 if (len > UINT16_MAX || len == 0)
423 return -EINVAL;
424
425 if (!GREEDY_REALLOC(p, n + len + 2))
426 return -ENOMEM;
427
428 unaligned_write_be16(p + n, len);
429 memcpy(p + n + 2, *s, len);
430 n += len + 2;
431 }
432
433 return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_USER_CLASS, n, p);
434}
435
436int dhcp6_option_append_vendor_class(uint8_t **buf, size_t *offset, char * const *vendor_class) {
437 _cleanup_free_ uint8_t *p = NULL;
438 size_t n = 0;
439
440 assert(buf);
441 assert(*buf);
442 assert(offset);
443
444 if (strv_isempty(vendor_class))
445 return 0;
446
447 if (!GREEDY_REALLOC(p, sizeof(be32_t)))
448 return -ENOMEM;
449
450 /* Enterprise Identifier */
451 unaligned_write_be32(p, SYSTEMD_PEN);
452 n += sizeof(be32_t);
453
454 STRV_FOREACH(s, vendor_class) {
455 size_t len = strlen(*s);
456
457 if (len > UINT16_MAX || len == 0)
458 return -EINVAL;
459
460 if (!GREEDY_REALLOC(p, n + len + 2))
461 return -ENOMEM;
462
463 unaligned_write_be16(p + n, len);
464 memcpy(p + n + 2, *s, len);
465 n += len + 2;
466 }
467
468 return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_VENDOR_CLASS, n, p);
469}
470
471int dhcp6_option_parse(
472 const uint8_t *buf,
473 size_t buflen,
474 size_t *offset,
475 uint16_t *ret_option_code,
476 size_t *ret_option_data_len,
477 const uint8_t **ret_option_data) {
478
479 size_t len;
480
481 assert(buf);
482 assert(offset);
483 assert(ret_option_code);
484 assert(ret_option_data_len);
485 assert(ret_option_data);
486
487 if (buflen < offsetof(DHCP6Option, data))
488 return -EBADMSG;
489
490 if (*offset > buflen - offsetof(DHCP6Option, data))
491 return -EBADMSG;
492
493 len = unaligned_read_be16(buf + *offset + offsetof(DHCP6Option, len));
494
495 if (len > buflen - offsetof(DHCP6Option, data) - *offset)
496 return -EBADMSG;
497
498 *ret_option_code = unaligned_read_be16(buf + *offset + offsetof(DHCP6Option, code));
499 *ret_option_data_len = len;
500 *ret_option_data = len == 0 ? NULL : buf + *offset + offsetof(DHCP6Option, data);
501 *offset += offsetof(DHCP6Option, data) + len;
502
503 return 0;
504}
505
506int dhcp6_option_parse_status(const uint8_t *data, size_t data_len, char **ret_status_message) {
507 DHCP6Status status;
508
509 assert(data || data_len == 0);
510
511 if (data_len < sizeof(uint16_t))
512 return -EBADMSG;
513
514 status = unaligned_read_be16(data);
515
516 if (ret_status_message) {
517 _cleanup_free_ char *msg = NULL;
518 const char *s;
519
520 /* The status message MUST NOT be null-terminated. See section 21.13 of RFC8415.
521 * Let's escape unsafe characters for safety. */
522 msg = cescape_length((const char*) (data + sizeof(uint16_t)), data_len - sizeof(uint16_t));
523 if (!msg)
524 return -ENOMEM;
525
526 s = dhcp6_message_status_to_string(status);
527 if (s && !strextend_with_separator(&msg, ": ", s))
528 return -ENOMEM;
529
530 *ret_status_message = TAKE_PTR(msg);
531 }
532
533 return status;
534}
535
536/* parse a string from dhcp option field. *ret must be initialized */
537int dhcp6_option_parse_string(const uint8_t *data, size_t data_len, char **ret) {
538 _cleanup_free_ char *string = NULL;
539 int r;
540
541 assert(data || data_len == 0);
542 assert(ret);
543
544 if (data_len <= 0) {
545 *ret = mfree(*ret);
546 return 0;
547 }
548
549 r = make_cstring((const char *) data, data_len, MAKE_CSTRING_REFUSE_TRAILING_NUL, &string);
550 if (r < 0)
551 return r;
552
553 return free_and_replace(*ret, string);
554}
555
556static int dhcp6_option_parse_ia_options(sd_dhcp6_client *client, const uint8_t *buf, size_t buflen) {
557 int r;
558
559 assert(buf || buflen == 0);
560
561 for (size_t offset = 0; offset < buflen;) {
562 const uint8_t *data;
563 size_t data_len;
564 uint16_t code;
565
566 r = dhcp6_option_parse(buf, buflen, &offset, &code, &data_len, &data);
567 if (r < 0)
568 return r;
569
570 switch (code) {
571 case SD_DHCP6_OPTION_STATUS_CODE: {
572 _cleanup_free_ char *msg = NULL;
573
574 r = dhcp6_option_parse_status(data, data_len, &msg);
575 if (r == -ENOMEM)
576 return r;
577 if (r > 0)
578 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
579 "Received an IA address or PD prefix option with non-zero status%s%s",
580 isempty(msg) ? "." : ": ", strempty(msg));
581 if (r < 0)
582 /* Let's log but ignore the invalid status option. */
583 log_dhcp6_client_errno(client, r,
584 "Received an IA address or PD prefix option with an invalid status sub option, ignoring: %m");
585 break;
586 }
587 default:
588 log_dhcp6_client(client, "Received an unknown sub option %u in IA address or PD prefix, ignoring.", code);
589 }
590 }
591
592 return 0;
593}
594
595static int dhcp6_option_parse_ia_address(sd_dhcp6_client *client, DHCP6IA *ia, const uint8_t *data, size_t len) {
596 _cleanup_free_ DHCP6Address *a = NULL;
597 usec_t lt_valid, lt_pref;
598 int r;
599
600 assert(ia);
601 assert(data || len == 0);
602
603 if (!IN_SET(ia->type, SD_DHCP6_OPTION_IA_NA, SD_DHCP6_OPTION_IA_TA))
604 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
605 "Received an IA address sub-option in an invalid option, ignoring.");
606
607 if (len < sizeof(struct iaaddr))
608 return -EBADMSG;
609
610 a = new(DHCP6Address, 1);
611 if (!a)
612 return -ENOMEM;
613
614 memcpy(&a->iaaddr, data, sizeof(struct iaaddr));
615
616 lt_valid = be32_sec_to_usec(a->iaaddr.lifetime_valid, /* max_as_infinity = */ true);
617 lt_pref = be32_sec_to_usec(a->iaaddr.lifetime_preferred, /* max_as_infinity = */ true);
618
619 if (lt_valid == 0)
620 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
621 "Received an IA address with zero valid lifetime, ignoring.");
622 if (lt_pref > lt_valid)
623 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
624 "Received an IA address with preferred lifetime %s "
625 "larger than valid lifetime %s, ignoring.",
626 FORMAT_TIMESPAN(lt_pref, USEC_PER_SEC),
627 FORMAT_TIMESPAN(lt_valid, USEC_PER_SEC));
628
629 if (len > sizeof(struct iaaddr)) {
630 r = dhcp6_option_parse_ia_options(client, data + sizeof(struct iaaddr), len - sizeof(struct iaaddr));
631 if (r < 0)
632 return r;
633 }
634
635 LIST_PREPEND(addresses, ia->addresses, TAKE_PTR(a));
636 return 0;
637}
638
639static int dhcp6_option_parse_ia_pdprefix(sd_dhcp6_client *client, DHCP6IA *ia, const uint8_t *data, size_t len) {
640 _cleanup_free_ DHCP6Address *a = NULL;
641 usec_t lt_valid, lt_pref;
642 int r;
643
644 assert(ia);
645 assert(data || len == 0);
646
647 if (ia->type != SD_DHCP6_OPTION_IA_PD)
648 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
649 "Received an PD prefix sub-option in an invalid option, ignoring");
650
651 if (len < sizeof(struct iapdprefix))
652 return -EBADMSG;
653
654 a = new(DHCP6Address, 1);
655 if (!a)
656 return -ENOMEM;
657
658 memcpy(&a->iapdprefix, data, sizeof(struct iapdprefix));
659
660 lt_valid = be32_sec_to_usec(a->iapdprefix.lifetime_valid, /* max_as_infinity = */ true);
661 lt_pref = be32_sec_to_usec(a->iapdprefix.lifetime_preferred, /* max_as_infinity = */ true);
662
663 if (lt_valid == 0)
664 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
665 "Received a PD prefix with zero valid lifetime, ignoring.");
666 if (lt_pref > lt_valid)
667 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
668 "Received a PD prefix with preferred lifetime %s "
669 "larger than valid lifetime %s, ignoring.",
670 FORMAT_TIMESPAN(lt_pref, USEC_PER_SEC),
671 FORMAT_TIMESPAN(lt_valid, USEC_PER_SEC));
672
673 if (len > sizeof(struct iapdprefix)) {
674 r = dhcp6_option_parse_ia_options(client, data + sizeof(struct iapdprefix), len - sizeof(struct iapdprefix));
675 if (r < 0)
676 return r;
677 }
678
679 LIST_PREPEND(addresses, ia->addresses, TAKE_PTR(a));
680 return 0;
681}
682
683int dhcp6_option_parse_ia(
684 sd_dhcp6_client *client,
685 be32_t iaid,
686 uint16_t option_code,
687 size_t option_data_len,
688 const uint8_t *option_data,
689 DHCP6IA **ret) {
690
691 _cleanup_(dhcp6_ia_freep) DHCP6IA *ia = NULL;
692 usec_t lt_t1, lt_t2;
693 size_t header_len;
694 int r;
695
696 assert(IN_SET(option_code, SD_DHCP6_OPTION_IA_NA, SD_DHCP6_OPTION_IA_TA, SD_DHCP6_OPTION_IA_PD));
697 assert(option_data || option_data_len == 0);
698 assert(ret);
699
700 /* This will return the following:
701 * -ENOMEM: memory allocation error,
702 * -ENOANO: unmatching IAID,
703 * -EINVAL: non-zero status code, or invalid lifetime,
704 * -EBADMSG: invalid message format,
705 * -ENODATA: no valid address or PD prefix,
706 * 0: success. */
707
708 switch (option_code) {
709 case SD_DHCP6_OPTION_IA_NA:
710 case SD_DHCP6_OPTION_IA_PD:
711 header_len = sizeof(struct ia_header);
712 break;
713
714 case SD_DHCP6_OPTION_IA_TA:
715 header_len = sizeof(be32_t); /* IA_TA does not have lifetime. */
716 break;
717
718 default:
719 assert_not_reached();
720 }
721
722 if (option_data_len < header_len)
723 return -EBADMSG;
724
725 ia = new(DHCP6IA, 1);
726 if (!ia)
727 return -ENOMEM;
728
729 *ia = (DHCP6IA) {
730 .type = option_code,
731 };
732 memcpy(&ia->header, option_data, header_len);
733
734 /* According to RFC8415, IAs which do not match the client's IAID should be ignored,
735 * but not necessary to ignore or refuse the whole message. */
736 if (ia->header.id != iaid)
737 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(ENOANO),
738 "Received an IA option with a different IAID "
739 "from the one chosen by the client, ignoring.");
740
741 /* It is not necessary to check if the lifetime_t2 is zero here, as in that case it will be updated later. */
742 lt_t1 = be32_sec_to_usec(ia->header.lifetime_t1, /* max_as_infinity = */ true);
743 lt_t2 = be32_sec_to_usec(ia->header.lifetime_t2, /* max_as_infinity = */ true);
744
745 if (lt_t1 > lt_t2)
746 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
747 "Received an IA option with T1 %s > T2 %s, ignoring.",
748 FORMAT_TIMESPAN(lt_t1, USEC_PER_SEC),
749 FORMAT_TIMESPAN(lt_t2, USEC_PER_SEC));
750 if (lt_t1 == 0 && lt_t2 > 0)
751 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
752 "Received an IA option with zero T1 and non-zero T2 (%s), ignoring.",
753 FORMAT_TIMESPAN(lt_t2, USEC_PER_SEC));
754
755 for (size_t offset = header_len; offset < option_data_len;) {
756 const uint8_t *subdata;
757 size_t subdata_len;
758 uint16_t subopt;
759
760 r = dhcp6_option_parse(option_data, option_data_len, &offset, &subopt, &subdata_len, &subdata);
761 if (r < 0)
762 return r;
763
764 switch (subopt) {
765 case SD_DHCP6_OPTION_IAADDR: {
766 r = dhcp6_option_parse_ia_address(client, ia, subdata, subdata_len);
767 if (r == -ENOMEM)
768 return r;
769
770 /* Ignore non-critical errors in the sub-option. */
771 break;
772 }
773 case SD_DHCP6_OPTION_IA_PD_PREFIX: {
774 r = dhcp6_option_parse_ia_pdprefix(client, ia, subdata, subdata_len);
775 if (r == -ENOMEM)
776 return r;
777
778 /* Ignore non-critical errors in the sub-option. */
779 break;
780 }
781 case SD_DHCP6_OPTION_STATUS_CODE: {
782 _cleanup_free_ char *msg = NULL;
783
784 r = dhcp6_option_parse_status(subdata, subdata_len, &msg);
785 if (r == -ENOMEM)
786 return r;
787 if (r > 0)
788 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL),
789 "Received an IA option with non-zero status%s%s",
790 isempty(msg) ? "." : ": ", strempty(msg));
791 if (r < 0)
792 log_dhcp6_client_errno(client, r,
793 "Received an IA option with an invalid status sub option, ignoring: %m");
794 break;
795 }
796 default:
797 log_dhcp6_client(client, "Received an IA option with an unknown sub-option %u, ignoring", subopt);
798 }
799 }
800
801 if (!ia->addresses)
802 return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(ENODATA),
803 "Received an IA option without valid IA addresses or PD prefixes, ignoring.");
804
805 *ret = TAKE_PTR(ia);
806 return 0;
807}
808
809int dhcp6_option_parse_addresses(
810 const uint8_t *optval,
811 size_t optlen,
812 struct in6_addr **addrs,
813 size_t *count) {
814
815 assert(optval || optlen == 0);
816 assert(addrs);
817 assert(count);
818
819 if (optlen == 0 || optlen % sizeof(struct in6_addr) != 0)
820 return -EBADMSG;
821
822 if (!GREEDY_REALLOC(*addrs, *count + optlen / sizeof(struct in6_addr)))
823 return -ENOMEM;
824
825 memcpy(*addrs + *count, optval, optlen);
826 *count += optlen / sizeof(struct in6_addr);
827
828 return 0;
829}
830
831int dhcp6_option_parse_domainname(const uint8_t *optval, size_t optlen, char **ret) {
832 _cleanup_free_ char *domain = NULL;
833 int r;
834
835 assert(optval || optlen == 0);
836 assert(ret);
837
838 r = dns_name_from_wire_format(&optval, &optlen, &domain);
839 if (r < 0)
840 return r;
841 if (r == 0)
842 return -ENODATA;
843 if (optlen != 0)
844 return -EINVAL;
845
846 *ret = TAKE_PTR(domain);
847 return 0;
848}
849
850int dhcp6_option_parse_domainname_list(const uint8_t *optval, size_t optlen, char ***ret) {
851 _cleanup_strv_free_ char **names = NULL;
852 int r;
853
854 assert(optval || optlen == 0);
855 assert(ret);
856
857 if (optlen <= 1)
858 return -ENODATA;
859 if (optval[optlen - 1] != '\0')
860 return -EINVAL;
861
862 while (optlen > 0) {
863 _cleanup_free_ char *name = NULL;
864
865 r = dns_name_from_wire_format(&optval, &optlen, &name);
866 if (r < 0)
867 return r;
868 if (dns_name_is_root(name)) /* root domain */
869 return -EBADMSG;
870
871 r = strv_consume(&names, TAKE_PTR(name));
872 if (r < 0)
873 return r;
874 }
875
876 *ret = TAKE_PTR(names);
877 return 0;
878}
879
880static sd_dhcp6_option* dhcp6_option_free(sd_dhcp6_option *i) {
881 if (!i)
882 return NULL;
883
884 free(i->data);
885 return mfree(i);
886}
887
888int sd_dhcp6_option_new(uint16_t option, const void *data, size_t length, uint32_t enterprise_identifier, sd_dhcp6_option **ret) {
889 assert_return(ret, -EINVAL);
890 assert_return(length == 0 || data, -EINVAL);
891
892 _cleanup_free_ void *q = memdup(data, length);
893 if (!q)
894 return -ENOMEM;
895
896 sd_dhcp6_option *p = new(sd_dhcp6_option, 1);
897 if (!p)
898 return -ENOMEM;
899
900 *p = (sd_dhcp6_option) {
901 .n_ref = 1,
902 .option = option,
903 .enterprise_identifier = enterprise_identifier,
904 .length = length,
905 .data = TAKE_PTR(q),
906 };
907
908 *ret = p;
909 return 0;
910}
911
912DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp6_option, sd_dhcp6_option, dhcp6_option_free);
913DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
914 dhcp6_option_hash_ops,
915 void,
916 trivial_hash_func,
917 trivial_compare_func,
918 sd_dhcp6_option,
919 sd_dhcp6_option_unref);
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