2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
32 #include <net/ethernet.h>
38 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
39 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
40 #define DHCPV6_CLIENT_PORT 546
41 #define DHCPV6_SERVER_PORT 547
42 #define DHCPV6_DUID_LLADDR 3
43 #define DHCPV6_REQ_DELAY 1
46 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
47 const uint8_t transaction[3], enum dhcpv6_msg type);
49 static uint32_t dhcpv6_parse_ia(void *opt, void *end);
51 static reply_handler dhcpv6_handle_reply;
52 static reply_handler dhcpv6_handle_advert;
53 static reply_handler dhcpv6_handle_rebind_reply;
54 static reply_handler dhcpv6_handle_reconfigure;
55 static int dhcpv6_commit_advert(void);
59 // RFC 3315 - 5.5 Timeout and Delay values
60 static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
61 [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, "<POLL>",
62 dhcpv6_handle_reconfigure, NULL},
63 [DHCPV6_MSG_SOLICIT] = {true, 1, 3600, "SOLICIT",
64 dhcpv6_handle_advert, dhcpv6_commit_advert},
65 [DHCPV6_MSG_REQUEST] = {true, 30, 10, "REQUEST",
66 dhcpv6_handle_reply, NULL},
67 [DHCPV6_MSG_RENEW] = {false, 10, 600, "RENEW",
68 dhcpv6_handle_reply, NULL},
69 [DHCPV6_MSG_REBIND] = {false, 10, 600, "REBIND",
70 dhcpv6_handle_rebind_reply, NULL},
71 [DHCPV6_MSG_RELEASE] = {false, 1, 600, "RELEASE", NULL, NULL},
72 [DHCPV6_MSG_DECLINE] = {false, 1, 3, "DECLINE", NULL, NULL},
73 [DHCPV6_MSG_INFO_REQ] = {true, 1, 120, "INFOREQ",
74 dhcpv6_handle_reply, NULL},
80 static int ifindex = -1;
81 static int64_t t1 = 0, t2 = 0, t3 = 0;
84 static int request_prefix = -1;
85 static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE, pd_mode = IA_MODE_NONE;
86 static bool accept_reconfig = false;
89 static uint8_t reconf_key[16];
93 int init_dhcpv6(const char *ifname, int request_pd)
95 request_prefix = request_pd;
97 sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
101 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
102 if (ioctl(sock, SIOCGIFINDEX, &ifr))
104 ifindex = ifr.ifr_ifindex;
106 // Create client DUID
107 size_t client_id_len;
108 odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
109 if (client_id_len == 0) {
110 ioctl(sock, SIOCGIFHWADDR, &ifr);
111 uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
112 DHCPV6_DUID_LLADDR, 0, 1};
113 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
115 uint8_t zero[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
116 struct ifreq ifs[100], *ifp, *ifend;
119 ifc.ifc_len = sizeof(ifs);
121 if (!memcmp(&duid[8], zero, ETHER_ADDR_LEN) &&
122 ioctl(sock, SIOCGIFCONF, &ifc) >= 0) {
123 // If our interface doesn't have an address...
124 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
125 for (ifp = ifc.ifc_req; ifp < ifend &&
126 !memcmp(&duid[8], zero, 6); ifp++) {
127 memcpy(ifr.ifr_name, ifp->ifr_name,
128 sizeof(ifr.ifr_name));
129 ioctl(sock, SIOCGIFHWADDR, &ifr);
130 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data,
135 odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
140 htons(DHCPV6_OPT_SIP_SERVER_D),
141 htons(DHCPV6_OPT_SIP_SERVER_A),
142 htons(DHCPV6_OPT_DNS_SERVERS),
143 htons(DHCPV6_OPT_DNS_DOMAIN),
144 htons(DHCPV6_OPT_NTP_SERVER),
145 htons(DHCPV6_OPT_SIP_SERVER_A),
146 htons(DHCPV6_OPT_AFTR_NAME),
147 htons(DHCPV6_OPT_PD_EXCLUDE),
148 #ifdef EXT_PREFIX_CLASS
149 htons(DHCPV6_OPT_PREFIX_CLASS),
152 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
155 // Configure IPv6-options
157 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
158 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
159 setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
161 struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
162 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
163 if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)))
170 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd)
177 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
181 gethostname(fqdn_buf, sizeof(fqdn_buf));
188 size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
189 sizeof(fqdn.data), NULL, NULL);
190 fqdn.type = htons(DHCPV6_OPT_FQDN);
191 fqdn.len = htons(fqdn_len - 4);
197 void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
201 void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
204 size_t ia_pd_entries, ia_pd_len = 0;
205 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
206 ia_pd_entries /= sizeof(*e);
207 struct dhcpv6_ia_hdr hdr_ia_pd = {
208 htons(DHCPV6_OPT_IA_PD),
209 htons(sizeof(hdr_ia_pd) - 4),
214 uint8_t *ia_pd = alloca(ia_pd_entries * (sizeof(struct dhcpv6_ia_prefix) + 10));
215 for (size_t i = 0; i < ia_pd_entries; ++i) {
217 if (e[i].priority > 0)
218 ex_len = ((e[i].priority - e[i].length - 1) / 8) + 6;
220 struct dhcpv6_ia_prefix p = {
221 .type = htons(DHCPV6_OPT_IA_PREFIX),
222 .len = htons(sizeof(p) - 4U + ex_len),
223 .prefix = e[i].length,
227 memcpy(ia_pd + ia_pd_len, &p, sizeof(p));
228 ia_pd_len += sizeof(p);
231 ia_pd[ia_pd_len++] = 0;
232 ia_pd[ia_pd_len++] = DHCPV6_OPT_PD_EXCLUDE;
233 ia_pd[ia_pd_len++] = 0;
234 ia_pd[ia_pd_len++] = ex_len - 4;
235 ia_pd[ia_pd_len++] = e[i].priority;
237 uint32_t excl = ntohl(e[i].router.s6_addr32[1]);
238 excl >>= (64 - e[i].priority);
239 excl <<= 8 - ((e[i].priority - e[i].length) % 8);
241 for (size_t i = ex_len - 5; i > 0; --i, excl >>= 8)
242 ia_pd[ia_pd_len + i] = excl & 0xff;
243 ia_pd_len += ex_len - 5;
247 struct dhcpv6_ia_prefix pref = {
248 .type = htons(DHCPV6_OPT_IA_PREFIX),
249 .len = htons(25), .prefix = request_prefix
251 if (request_prefix > 0 && ia_pd_len == 0 && type == DHCPV6_MSG_SOLICIT) {
252 ia_pd = (uint8_t*)&pref;
253 ia_pd_len = sizeof(pref);
255 hdr_ia_pd.len = htons(ntohs(hdr_ia_pd.len) + ia_pd_len);
258 size_t ia_na_entries, ia_na_len = 0;
260 e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
261 ia_na_entries /= sizeof(*e);
263 struct dhcpv6_ia_hdr hdr_ia_na = {
264 htons(DHCPV6_OPT_IA_NA),
265 htons(sizeof(hdr_ia_na) - 4),
269 struct dhcpv6_ia_addr pa[ia_na_entries];
270 for (size_t i = 0; i < ia_na_entries; ++i) {
271 pa[i].type = htons(DHCPV6_OPT_IA_ADDR);
272 pa[i].len = htons(sizeof(pa[i]) - 4U);
273 pa[i].addr = e[i].target;
279 ia_na_len = sizeof(pa);
280 hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
282 // Reconfigure Accept
286 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
288 // Request Information Refresh
289 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
293 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
297 uint16_t elapsed_type;
298 uint16_t elapsed_len;
299 uint16_t elapsed_value;
303 type, {trid[0], trid[1], trid[2]},
304 htons(DHCPV6_OPT_ELAPSED), htons(2),
305 htons((ecs > 0xffff) ? 0xffff : ecs),
306 htons(DHCPV6_OPT_ORO), htons(oro_len),
309 struct iovec iov[] = {
314 {srv_id, srv_id_len},
315 {&reconf_accept, sizeof(reconf_accept)},
317 {&hdr_ia_na, sizeof(hdr_ia_na)},
319 {&hdr_ia_pd, sizeof(hdr_ia_pd)},
323 size_t cnt = ARRAY_SIZE(iov);
324 if (type == DHCPV6_MSG_INFO_REQ) {
326 iov[2].iov_len = sizeof(oro_refresh);
327 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
328 } else if (!request_prefix) {
332 // Disable IAs if not used
333 if (type != DHCPV6_MSG_SOLICIT) {
341 if (na_mode == IA_MODE_NONE)
344 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
345 0, ALL_DHCPV6_RELAYS, ifindex};
346 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
348 sendmsg(sock, &msg, 0);
352 static int64_t dhcpv6_rand_delay(int64_t time)
355 odhcp6c_random(&random, sizeof(random));
356 return (time * ((int64_t)random % 1000LL)) / 10000LL;
360 int dhcpv6_request(enum dhcpv6_msg type)
363 uint64_t timeout = UINT32_MAX;
364 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
367 struct timespec ts = {0, 0};
368 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
369 nanosleep(&ts, NULL);
372 if (type == DHCPV6_MSG_RELEASE || type == DHCPV6_MSG_DECLINE)
374 else if (type == DHCPV6_MSG_UNKNOWN)
376 else if (type == DHCPV6_MSG_RENEW)
377 timeout = (t2 > t1) ? t2 - t1 : 0;
378 else if (type == DHCPV6_MSG_REBIND)
379 timeout = (t3 > t2) ? t3 - t2 : 0;
384 syslog(LOG_NOTICE, "Sending %s (timeout %us)", retx->name, (unsigned)timeout);
386 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
388 // Generate transaction ID
389 uint8_t trid[3] = {0, 0, 0};
390 if (type != DHCPV6_MSG_UNKNOWN)
391 odhcp6c_random(trid, sizeof(trid));
396 rto = (rto == 0) ? (retx->init_timeo * 1000 +
397 dhcpv6_rand_delay(retx->init_timeo * 1000)) :
398 (2 * rto + dhcpv6_rand_delay(rto));
400 if (rto >= retx->max_timeo * 1000)
401 rto = retx->max_timeo * 1000 +
402 dhcpv6_rand_delay(retx->max_timeo * 1000);
404 // Calculate end for this round and elapsed time
405 uint64_t round_end = round_start + rto;
406 elapsed = round_start - start;
408 // Don't wait too long
409 if (round_end - start > timeout * 1000)
410 round_end = timeout * 1000 + start;
412 // Built and send package
413 if (type != DHCPV6_MSG_UNKNOWN)
414 dhcpv6_send(type, trid, elapsed / 10);
417 for (; len < 0 && round_start < round_end;
418 round_start = odhcp6c_get_milli_time()) {
419 // Check for pending signal
420 if (odhcp6c_signal_process())
423 // Set timeout for receiving
424 uint64_t t = round_end - round_start;
425 struct timeval timeout = {t / 1000, (t % 1000) * 1000};
426 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
427 &timeout, sizeof(timeout));
430 len = recv(sock, buf, sizeof(buf), 0);
432 if (!dhcpv6_response_is_valid(buf, len, trid, type))
436 uint8_t *opt = &buf[4];
437 uint8_t *opt_end = opt + len - 4;
439 round_start = odhcp6c_get_milli_time();
440 elapsed = round_start - start;
441 syslog(LOG_NOTICE, "Got a valid reply after "
442 "%ums", (unsigned)elapsed);
444 if (retx->handler_reply)
445 len = retx->handler_reply(
448 if (len > 0 && round_end - round_start > 1000)
449 round_end = 1000 + round_start;
454 if (retx->handler_finish)
455 len = retx->handler_finish();
456 } while (len < 0 && elapsed / 1000 < timeout);
462 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
463 const uint8_t transaction[3], enum dhcpv6_msg type)
465 const struct dhcpv6_header *rep = buf;
466 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
467 transaction, sizeof(rep->tr_id)))
468 return false; // Invalid reply
470 if (type == DHCPV6_MSG_SOLICIT) {
471 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
472 rep->msg_type != DHCPV6_MSG_REPLY)
474 } else if (type == DHCPV6_MSG_UNKNOWN) {
475 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
477 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
481 uint8_t *end = ((uint8_t*)buf) + len, *odata;
482 uint16_t otype, olen;
483 bool clientid_ok = false, serverid_ok = false, rcauth_ok = false;
485 size_t client_id_len, server_id_len;
486 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
487 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
489 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata) {
490 if (otype == DHCPV6_OPT_CLIENTID) {
491 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
492 &odata[-4], client_id, client_id_len);
493 } else if (otype == DHCPV6_OPT_SERVERID) {
494 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
495 &odata[-4], server_id, server_id_len);
496 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
497 sizeof(struct dhcpv6_auth_reconfigure)) {
498 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
499 if (r->protocol != 3 || r->algorithm != 1 || r->reconf_type != 2)
503 uint8_t serverhash[16], secretbytes[16], hash[16];
504 memcpy(serverhash, r->key, sizeof(serverhash));
505 memset(r->key, 0, sizeof(r->key));
506 memcpy(secretbytes, reconf_key, sizeof(secretbytes));
508 for (size_t i = 0; i < sizeof(secretbytes); ++i)
509 secretbytes[i] ^= 0x36;
512 md5_append(&md5, secretbytes, sizeof(secretbytes));
513 md5_append(&md5, buf, len);
514 md5_finish(&md5, hash);
516 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
517 secretbytes[i] ^= 0x36;
518 secretbytes[i] ^= 0x5c;
522 md5_append(&md5, secretbytes, sizeof(secretbytes));
523 md5_append(&md5, hash, 16);
524 md5_finish(&md5, hash);
526 rcauth_ok = !memcmp(hash, serverhash, sizeof(hash));
530 if (rep->msg_type == DHCPV6_MSG_RECONF && !rcauth_ok)
533 return clientid_ok && (serverid_ok || server_id_len == 0);
537 int dhcpv6_poll_reconfigure(void)
539 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
541 ret = dhcpv6_request(ret);
547 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig,
548 const void *opt, const void *end)
550 // TODO: should verify the reconfigure message
551 uint16_t otype, olen;
552 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
553 dhcpv6_for_each_option(opt, end, otype, olen, odata)
554 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
555 odata[0] == DHCPV6_MSG_RENEW ||
556 odata[0] == DHCPV6_MSG_INFO_REQ))
559 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
564 // Collect all advertised servers
565 static int dhcpv6_handle_advert(enum dhcpv6_msg orig,
566 const void *opt, const void *end)
568 uint16_t olen, otype;
570 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}, NULL, NULL, 0, 0};
571 bool have_na = false, have_pd = false;
573 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
574 if (orig == DHCPV6_MSG_SOLICIT &&
575 (otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA) &&
576 olen > sizeof(struct dhcpv6_ia_hdr)) {
577 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
578 dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
581 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
582 memcpy(cand.duid, odata, olen);
583 cand.duid_len = olen;
584 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 && !odata[0]
585 && odata[1] == DHCPV6_NoPrefixAvail) {
586 cand.preference -= 2000;
587 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
588 cand.preference >= 0) {
589 cand.preference = odata[0];
590 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
591 cand.wants_reconfigure = true;
592 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
593 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
594 uint8_t *oend = odata + olen, *d;
595 dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
596 if (otype == DHCPV6_OPT_IA_PREFIX)
598 } else if (otype == DHCPV6_OPT_IA_NA) {
599 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
600 uint8_t *oend = odata + olen, *d;
601 dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
602 if (otype == DHCPV6_OPT_IA_ADDR)
607 if ((!have_na && na_mode == IA_MODE_FORCE) ||
608 (!have_pd && pd_mode == IA_MODE_FORCE))
611 if (na_mode != IA_MODE_NONE && !have_na) {
612 cand.has_noaddravail = true;
613 cand.preference -= 1000;
616 if (pd_mode != IA_MODE_NONE) {
618 cand.preference += 2000;
620 cand.preference -= 2000;
623 if (cand.duid_len > 0) {
624 cand.ia_na = odhcp6c_move_state(STATE_IA_NA, &cand.ia_na_len);
625 cand.ia_pd = odhcp6c_move_state(STATE_IA_PD, &cand.ia_pd_len);
626 odhcp6c_add_state(STATE_SERVER_CAND, &cand, sizeof(cand));
629 if (orig == DHCPV6_MSG_SOLICIT) {
630 odhcp6c_clear_state(STATE_IA_NA);
631 odhcp6c_clear_state(STATE_IA_PD);
638 static int dhcpv6_commit_advert(void)
641 struct dhcpv6_server_cand *c = NULL, *cand =
642 odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
645 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
646 if (cand[i].has_noaddravail)
647 retry = true; // We want to try again
649 if (!c || c->preference < cand[i].preference)
653 if (retry && na_mode == IA_MODE_TRY) {
654 // We give it a second try without the IA_NA
655 na_mode = IA_MODE_NONE;
656 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
660 uint16_t hdr[2] = {htons(DHCPV6_OPT_SERVERID),
662 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
663 odhcp6c_add_state(STATE_SERVER_ID, c->duid, c->duid_len);
664 accept_reconfig = c->wants_reconfigure;
665 odhcp6c_add_state(STATE_IA_NA, c->ia_na, c->ia_na_len);
666 odhcp6c_add_state(STATE_IA_PD, c->ia_pd, c->ia_pd_len);
669 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
673 odhcp6c_clear_state(STATE_SERVER_CAND);
677 else if (request_prefix || na_mode != IA_MODE_NONE)
678 return DHCPV6_STATEFUL;
680 return DHCPV6_STATELESS;
684 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig,
685 const void *opt, const void *end)
687 dhcpv6_handle_advert(orig, opt, end);
688 if (dhcpv6_commit_advert() < 0) {
689 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
693 return dhcpv6_handle_reply(orig, opt, end);
697 static int dhcpv6_handle_reply(enum dhcpv6_msg orig,
698 const void *opt, const void *end)
701 uint16_t otype, olen;
705 if (orig == DHCPV6_MSG_UNKNOWN) {
706 static time_t last_update = 0;
707 time_t now = odhcp6c_get_milli_time() / 1000;
709 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
725 t1 = t2 = t3 = UINT32_MAX;
728 if (orig == DHCPV6_MSG_REQUEST) {
729 // Delete NA and PD we have in the state from the Advert
730 odhcp6c_clear_state(STATE_IA_NA);
731 odhcp6c_clear_state(STATE_IA_PD);
735 odhcp6c_clear_state(STATE_DNS);
736 odhcp6c_clear_state(STATE_SEARCH);
737 odhcp6c_clear_state(STATE_SNTP_IP);
738 odhcp6c_clear_state(STATE_SNTP_FQDN);
739 odhcp6c_clear_state(STATE_SIP_IP);
740 odhcp6c_clear_state(STATE_SIP_FQDN);
741 odhcp6c_clear_state(STATE_AFTR_NAME);
744 // Parse and find all matching IAs
745 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
746 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
747 && olen > sizeof(struct dhcpv6_ia_hdr)) {
748 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
749 uint32_t l_t1 = ntohl(ia_hdr->t1);
750 uint32_t l_t2 = ntohl(ia_hdr->t2);
752 // Test ID and T1-T2 validity
753 if (ia_hdr->iaid != 1 || l_t2 < l_t1)
757 uint16_t stype, slen;
759 // Test status and bail if error
760 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
762 if (stype == DHCPV6_OPT_STATUS && slen >= 2)
763 error = ((int)sdata[0]) << 8 | ((int)sdata[1]);
766 syslog(LOG_WARNING, "Server returned IAID status %i!", error);
772 uint32_t n = dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
784 if (l_t1 > 0 && t1 > l_t1)
787 if (l_t2 > 0 && t2 > l_t2)
790 } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
792 odhcp6c_add_state(STATE_DNS, odata, olen);
793 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
794 odhcp6c_add_state(STATE_SEARCH, odata, olen);
795 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
796 uint16_t stype, slen;
798 // Test status and bail if error
799 dhcpv6_for_each_option(odata, odata + olen,
800 stype, slen, sdata) {
801 if (slen == 16 && (stype == NTP_MC_ADDR ||
802 stype == NTP_SRV_ADDR))
803 odhcp6c_add_state(STATE_SNTP_IP,
805 else if (slen > 0 && stype == NTP_SRV_FQDN)
806 odhcp6c_add_state(STATE_SNTP_FQDN,
809 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
811 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
812 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
813 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
814 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
815 uint32_t refresh = ntohl(*((uint32_t*)odata));
816 if (refresh < (uint32_t)t1)
818 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
819 sizeof(struct dhcpv6_auth_reconfigure)) {
820 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
821 if (r->protocol == 3 && r->algorithm == 1 &&
823 memcpy(reconf_key, r->key, sizeof(r->key));
824 } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) {
826 odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
828 odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
829 } else if (otype != DHCPV6_OPT_CLIENTID &&
830 otype != DHCPV6_OPT_SERVERID) {
831 odhcp6c_add_state(STATE_CUSTOM_OPTS,
832 &odata[-4], olen + 4);
836 if (t1 == UINT32_MAX)
839 if (t2 == UINT32_MAX)
842 if (t3 == UINT32_MAX)
849 static uint32_t dhcpv6_parse_ia(void *opt, void *end)
851 uint32_t timeout = UINT32_MAX; // Minimum timeout
852 uint16_t otype, olen;
856 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
857 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
858 IN6ADDR_ANY_INIT, 0, 0, 0};
860 if (otype == DHCPV6_OPT_IA_PREFIX) {
861 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
862 if (olen + 4U < sizeof(*prefix))
865 entry.valid = ntohl(prefix->valid);
866 entry.preferred = ntohl(prefix->preferred);
868 if (entry.preferred > entry.valid)
871 entry.length = prefix->prefix;
872 entry.target = prefix->addr;
873 uint16_t stype, slen;
876 #ifdef EXT_PREFIX_CLASS
877 // Find prefix class, if any
878 dhcpv6_for_each_option(&prefix[1], odata + olen,
880 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
881 entry.class = sdata[0] << 8 | sdata[1];
886 dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
887 odata + olen, stype, slen, sdata) {
888 if (stype != DHCPV6_OPT_PD_EXCLUDE || slen < 2)
891 uint8_t elen = sdata[0];
895 if (elen <= 32 || elen <= entry.length) {
901 uint8_t bytes = ((elen - entry.length - 1) / 8) + 1;
907 uint32_t exclude = 0;
909 exclude = exclude << 8 | sdata[bytes];
912 exclude >>= 8 - ((elen - entry.length) % 8);
913 exclude <<= 64 - elen;
915 // Abusing router & priority fields for exclusion
916 entry.router = entry.target;
917 entry.router.s6_addr32[1] |= htonl(exclude);
918 entry.priority = elen;
922 odhcp6c_update_entry(STATE_IA_PD, &entry);
925 memset(&entry.router, 0, sizeof(entry.router));
926 } else if (otype == DHCPV6_OPT_IA_ADDR) {
927 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
928 if (olen + 4U < sizeof(*addr))
931 entry.preferred = ntohl(addr->preferred);
932 entry.valid = ntohl(addr->valid);
934 if (entry.preferred > entry.valid)
938 entry.target = addr->addr;
940 #ifdef EXT_PREFIX_CLASS
941 uint16_t stype, slen;
943 // Find prefix class, if any
944 dhcpv6_for_each_option(&addr[1], odata + olen,
946 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
947 entry.class = sdata[0] << 8 | sdata[1];
950 odhcp6c_update_entry(STATE_IA_NA, &entry);
952 if (entry.valid > 0 && timeout > entry.valid)
953 timeout = entry.valid;