2 * Copyright (C) 2012 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.
26 #include <sys/ioctl.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
31 #include <net/ethernet.h>
36 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
37 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
38 #define DHCPV6_CLIENT_PORT 546
39 #define DHCPV6_SERVER_PORT 547
40 #define DHCPV6_DUID_LLADDR 3
41 #define DHCPV6_REQ_DELAY 1
44 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
45 const uint8_t transaction[3], enum dhcpv6_msg type);
47 static time_t dhcpv6_parse_ia(void *opt, void *end);
49 static reply_handler dhcpv6_handle_reply;
50 static reply_handler dhcpv6_handle_advert;
51 static reply_handler dhcpv6_handle_rebind_reply;
52 static reply_handler dhcpv6_handle_reconfigure;
53 static int dhcpv6_commit_advert(void);
57 // RFC 3315 - 5.5 Timeout and Delay values
58 static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
59 [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, "<POLL>",
60 dhcpv6_handle_reconfigure, NULL},
61 [DHCPV6_MSG_SOLICIT] = {true, 1, 120, "SOLICIT",
62 dhcpv6_handle_advert, dhcpv6_commit_advert},
63 [DHCPV6_MSG_REQUEST] = {true, 30, 10, "REQUEST",
64 dhcpv6_handle_reply, NULL},
65 [DHCPV6_MSG_RENEW] = {false, 10, 600, "RENEW",
66 dhcpv6_handle_reply, NULL},
67 [DHCPV6_MSG_REBIND] = {false, 10, 600, "REBIND",
68 dhcpv6_handle_rebind_reply, NULL},
69 [DHCPV6_MSG_RELEASE] = {false, 1, 600, "RELEASE", NULL, NULL},
70 [DHCPV6_MSG_DECLINE] = {false, 1, 3, "DECLINE", NULL, NULL},
71 [DHCPV6_MSG_INFO_REQ] = {true, 1, 120, "INFOREQ",
72 dhcpv6_handle_reply, NULL},
78 static int ifindex = -1;
79 static time_t t1 = 0, t2 = 0, t3 = 0;
82 static int request_prefix = -1;
83 static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE;
84 static bool accept_reconfig = false;
88 int init_dhcpv6(const char *ifname, int request_pd)
90 request_prefix = request_pd;
92 sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
96 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
97 if (ioctl(sock, SIOCGIFINDEX, &ifr))
99 ifindex = ifr.ifr_ifindex;
101 // Create client DUID
102 size_t client_id_len;
103 odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
104 if (client_id_len == 0) {
105 ioctl(sock, SIOCGIFHWADDR, &ifr);
106 uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
107 DHCPV6_DUID_LLADDR, 0, 1};
108 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
110 uint8_t zero[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
111 struct ifreq ifs[100], *ifp, *ifend;
114 ifc.ifc_len = sizeof(ifs);
116 if (!memcmp(&duid[8], zero, ETHER_ADDR_LEN) &&
117 ioctl(sock, SIOCGIFCONF, &ifc) >= 0) {
118 // If our interface doesn't have an address...
119 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
120 for (ifp = ifc.ifc_req; ifp < ifend &&
121 !memcmp(&duid[8], zero, 6); ifp++) {
122 memcpy(ifr.ifr_name, ifp->ifr_name,
123 sizeof(ifr.ifr_name));
124 ioctl(sock, SIOCGIFHWADDR, &ifr);
125 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data,
130 odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
134 uint16_t oro[] = {htons(DHCPV6_OPT_DNS_SERVERS),
135 htons(DHCPV6_OPT_DNS_DOMAIN),
136 htons(DHCPV6_OPT_NTP_SERVER),
137 htons(DHCPV6_OPT_SIP_SERVER_A),
138 htons(DHCPV6_OPT_SIP_SERVER_D)};
139 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
142 // Configure IPv6-options
144 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
145 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
146 setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
148 struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
149 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
150 if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)))
157 void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode)
163 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
167 gethostname(fqdn_buf, sizeof(fqdn_buf));
174 size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
175 sizeof(fqdn.data), NULL, NULL);
176 fqdn.type = htons(DHCPV6_OPT_FQDN);
177 fqdn.len = htons(fqdn_len - 4);
183 void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
187 void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
190 size_t ia_pd_entry_len, ia_pd_len = 0;
192 void *ia_pd_entries = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entry_len);
193 struct dhcpv6_ia_hdr hdr_ia_pd = {
194 htons(DHCPV6_OPT_IA_PD),
195 htons(sizeof(hdr_ia_pd) - 4 + ia_pd_len),
199 struct dhcpv6_ia_prefix pref = {
200 .type = htons(DHCPV6_OPT_IA_PREFIX),
201 .len = htons(25), .prefix = request_prefix
204 if (ia_pd_entry_len > 0) {
205 struct odhcp6c_entry *e = ia_pd_entries;
206 size_t entries = ia_pd_entry_len / sizeof(*e);
207 struct dhcpv6_ia_prefix p[entries];
208 for (size_t i = 0; i < entries; ++i) {
209 p[i].type = htons(DHCPV6_OPT_IA_PREFIX);
210 p[i].len = htons(sizeof(p[i]) - 4U);
211 p[i].preferred = htonl(e[i].preferred);
212 p[i].valid = htonl(e[i].valid);
213 p[i].prefix = e[i].length;
214 p[i].addr = e[i].target;
217 ia_pd_len = sizeof(p);
218 } else if (request_prefix > 0 &&
219 (type == DHCPV6_MSG_SOLICIT ||
220 type == DHCPV6_MSG_REQUEST)) {
222 ia_pd_len = sizeof(pref);
226 size_t ia_na_entry_len, ia_na_len = 0;
228 void *ia_na_entries = odhcp6c_get_state(STATE_IA_NA, &ia_na_entry_len);
229 struct dhcpv6_ia_hdr hdr_ia_na = {
230 htons(DHCPV6_OPT_IA_NA),
231 htons(sizeof(hdr_ia_na) - 4 + ia_na_len),
235 if (ia_na_entry_len > 0) {
236 struct odhcp6c_entry *e = ia_na_entries;
237 size_t entries = ia_na_entry_len / sizeof(*e);
238 struct dhcpv6_ia_addr p[entries];
239 for (size_t i = 0; i < entries; ++i) {
240 p[i].type = htons(DHCPV6_OPT_IA_ADDR);
241 p[i].len = htons(sizeof(p[i]) - 4U);
242 p[i].addr = e[i].target;
243 p[i].preferred = htonl(e[i].preferred);
244 p[i].valid = htonl(e[i].valid);
247 ia_na_len = sizeof(p);
250 // Reconfigure Accept
254 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
256 // Request Information Refresh
257 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
261 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
265 uint16_t elapsed_type;
266 uint16_t elapsed_len;
267 uint16_t elapsed_value;
271 type, {trid[0], trid[1], trid[2]},
272 htons(DHCPV6_OPT_ELAPSED), htons(2),
273 htons((ecs > 0xffff) ? 0xffff : ecs),
274 htons(DHCPV6_OPT_ORO), htons(oro_len),
277 struct iovec iov[] = {
282 {srv_id, srv_id_len},
285 {&hdr_ia_na, sizeof(hdr_ia_na)},
287 {&hdr_ia_pd, sizeof(hdr_ia_pd)},
291 size_t cnt = ARRAY_SIZE(iov);
292 if (type == DHCPV6_MSG_INFO_REQ) {
294 iov[2].iov_len = sizeof(oro_refresh);
295 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
296 } else if (!request_prefix) {
300 // Disable IAs if not used
301 if (type == DHCPV6_MSG_SOLICIT) {
302 iov[5].iov_len = sizeof(reconf_accept);
303 } else if (type != DHCPV6_MSG_REQUEST) {
310 if (na_mode == IA_MODE_NONE)
313 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
314 0, ALL_DHCPV6_RELAYS, ifindex};
315 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
317 sendmsg(sock, &msg, 0);
321 static int64_t dhcpv6_rand_delay(int64_t time)
324 odhcp6c_random(&random, sizeof(random));
325 return (time * (random % 1000)) / 10000;
329 int dhcpv6_request(enum dhcpv6_msg type)
332 uint32_t timeout = UINT32_MAX;
333 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
336 struct timespec ts = {0, 0};
337 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
338 nanosleep(&ts, NULL);
341 if (type == DHCPV6_MSG_RELEASE || type == DHCPV6_MSG_DECLINE)
343 else if (type == DHCPV6_MSG_UNKNOWN)
345 else if (type == DHCPV6_MSG_RENEW)
347 else if (type == DHCPV6_MSG_REBIND)
353 syslog(LOG_NOTICE, "Sending %s (timeout %us)", retx->name, timeout);
355 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
357 // Generate transaction ID
359 odhcp6c_random(trid, sizeof(trid));
364 rto = (rto == 0) ? (retx->init_timeo * 1000 +
365 dhcpv6_rand_delay(retx->init_timeo * 1000)) :
366 (2 * rto + dhcpv6_rand_delay(rto));
368 if (rto >= retx->max_timeo * 1000)
369 rto = retx->max_timeo * 1000 +
370 dhcpv6_rand_delay(retx->max_timeo * 1000);
372 // Calculate end for this round and elapsed time
373 uint64_t round_end = round_start + rto;
374 elapsed = round_start - start;
376 // Don't wait too long
377 if (round_end - start > timeout * 1000)
378 round_end = timeout * 1000 + start;
380 // Built and send package
381 if (type != DHCPV6_MSG_UNKNOWN)
382 dhcpv6_send(type, trid, elapsed / 10);
385 for (; len < 0 && round_start < round_end;
386 round_start = odhcp6c_get_milli_time()) {
387 // Check for pending signal
388 if (odhcp6c_signal_process())
391 // Set timeout for receiving
392 uint64_t t = round_end - round_start;
393 struct timeval timeout = {t / 1000, (t % 1000) * 1000};
394 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
395 &timeout, sizeof(timeout));
398 len = recv(sock, buf, sizeof(buf), 0);
400 if (!dhcpv6_response_is_valid(buf, len, trid, type))
404 uint8_t *opt = &buf[4];
405 uint8_t *opt_end = opt + len - 4;
407 round_start = odhcp6c_get_milli_time();
408 elapsed = round_start - start;
409 syslog(LOG_NOTICE, "Got a valid reply after "
410 "%ums", (unsigned)elapsed);
412 if (retx->handler_reply)
413 len = retx->handler_reply(
416 if (round_end - round_start > 1000)
417 round_end = 1000 + round_start;
422 if (retx->handler_finish)
423 len = retx->handler_finish();
424 } while (len < 0 && elapsed / 1000 < timeout);
430 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
431 const uint8_t transaction[3], enum dhcpv6_msg type)
433 const struct dhcpv6_header *rep = buf;
434 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
435 transaction, sizeof(rep->tr_id)))
436 return false; // Invalid reply
438 if (type == DHCPV6_MSG_SOLICIT) {
439 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
440 rep->msg_type != DHCPV6_MSG_REPLY)
442 } else if (type == DHCPV6_MSG_UNKNOWN) {
443 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
445 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
449 uint8_t *end = ((uint8_t*)buf) + len, *odata;
450 uint16_t otype, olen;
451 bool clientid_ok = false, serverid_ok = false;
453 size_t client_id_len, server_id_len;
454 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
455 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
457 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata)
458 if (otype == DHCPV6_OPT_CLIENTID)
459 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
460 &odata[-4], client_id, client_id_len);
461 else if (otype == DHCPV6_OPT_SERVERID)
462 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
463 &odata[-4], server_id, server_id_len);
465 return clientid_ok && (serverid_ok || server_id_len == 0);
469 int dhcpv6_poll_reconfigure(void)
471 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
473 ret = dhcpv6_request(ret);
479 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig,
480 const void *opt, const void *end)
482 // TODO: should verify the reconfigure message
483 uint16_t otype, olen;
484 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
485 dhcpv6_for_each_option(opt, end, otype, olen, odata)
486 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
487 odata[0] == DHCPV6_MSG_RENEW ||
488 odata[0] == DHCPV6_MSG_INFO_REQ))
491 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
496 // Collect all advertised servers
497 static int dhcpv6_handle_advert(_unused enum dhcpv6_msg orig,
498 const void *opt, const void *end)
500 uint16_t olen, otype;
502 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}};
504 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
505 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
506 memcpy(cand.duid, odata, olen);
507 cand.duid_len = olen;
508 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 && !odata[0]
509 && odata[1] == DHCPV6_NoAddrsAvail) {
510 if (na_mode == IA_MODE_FORCE) {
513 cand.has_noaddravail = true;
514 cand.preference -= 1000;
516 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 && !odata[0]
517 && odata[1] == DHCPV6_NoPrefixAvail) {
518 cand.preference -= 2000;
519 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
520 cand.preference >= 0) {
521 cand.preference = odata[1];
522 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
523 cand.wants_reconfigure = true;
524 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
525 struct dhcpv6_ia_hdr *h = (void*)odata;
526 uint8_t *oend = odata + olen, *d;
527 dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
528 if (otype == DHCPV6_OPT_IA_PREFIX)
529 cand.preference += 2000;
530 else if (otype == DHCPV6_OPT_STATUS &&
531 olen >= 2 && d[0] == 0 &&
532 d[1] == DHCPV6_NoPrefixAvail)
533 cand.preference -= 2000;
538 if (cand.duid_len > 0)
539 odhcp6c_add_state(STATE_SERVER_CAND, &cand, sizeof(cand));
545 static int dhcpv6_commit_advert(void)
548 struct dhcpv6_server_cand *c = NULL, *cand =
549 odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
552 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
553 if (cand[i].has_noaddravail)
554 retry = true; // We want to try again
556 if (!c || c->preference < cand[i].preference)
560 if (retry && na_mode == IA_MODE_TRY) {
561 // We give it a second try without the IA_NA
562 na_mode = IA_MODE_NONE;
563 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
567 uint16_t hdr[2] = {htons(DHCPV6_OPT_SERVERID),
569 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
570 odhcp6c_add_state(STATE_SERVER_ID, c->duid, c->duid_len);
571 accept_reconfig = c->wants_reconfigure;
574 odhcp6c_clear_state(STATE_SERVER_CAND);
578 else if (request_prefix || na_mode != IA_MODE_NONE)
579 return DHCPV6_STATEFUL;
581 return DHCPV6_STATELESS;
585 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig,
586 const void *opt, const void *end)
588 dhcpv6_handle_advert(orig, opt, end);
589 if (dhcpv6_commit_advert() < 0) {
590 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
594 return dhcpv6_handle_reply(orig, opt, end);
598 static int dhcpv6_handle_reply(enum dhcpv6_msg orig,
599 const void *opt, const void *end)
602 uint16_t otype, olen;
604 static time_t last_update = 0;
605 time_t now = odhcp6c_get_milli_time() / 1000;
607 uint32_t elapsed = now - last_update;
610 if (orig == DHCPV6_MSG_UNKNOWN) {
624 t1 = t2 = t3 = 86400;
628 odhcp6c_clear_state(STATE_DNS);
629 odhcp6c_clear_state(STATE_SEARCH);
630 odhcp6c_clear_state(STATE_SNTP_IP);
631 odhcp6c_clear_state(STATE_SNTP_FQDN);
632 odhcp6c_clear_state(STATE_SIP_IP);
633 odhcp6c_clear_state(STATE_SIP_FQDN);
636 // Parse and find all matching IAs
637 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
638 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
639 && olen > sizeof(struct dhcpv6_ia_hdr)) {
640 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
641 time_t l_t1 = ntohl(ia_hdr->t1);
642 time_t l_t2 = ntohl(ia_hdr->t2);
644 // Test ID and T1-T2 validity
645 if (ia_hdr->iaid != 1 || l_t2 < l_t1)
648 uint16_t stype, slen;
650 // Test status and bail if error
651 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
653 if (stype == DHCPV6_OPT_STATUS && slen >= 2 &&
654 (sdata[0] || sdata[1]))
658 if (l_t1 > 0 && t1 > l_t1)
661 if (l_t2 > 0 && t2 > l_t2)
664 time_t n = dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
675 } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
677 odhcp6c_add_state(STATE_DNS, odata, olen);
678 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
679 odhcp6c_add_state(STATE_SEARCH, odata, olen);
680 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
681 uint16_t stype, slen;
683 // Test status and bail if error
684 dhcpv6_for_each_option(odata, odata + olen,
685 stype, slen, sdata) {
686 if (slen == 16 && (stype == NTP_MC_ADDR ||
687 stype == NTP_SRV_ADDR))
688 odhcp6c_add_state(STATE_SNTP_IP,
690 else if (slen > 0 && stype == NTP_SRV_FQDN)
691 odhcp6c_add_state(STATE_SNTP_FQDN,
694 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
696 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
697 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
698 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
699 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
700 uint32_t refresh = ntohl(*((uint32_t*)odata));
701 if (refresh < (uint32_t)t1)
703 } else if (otype != DHCPV6_OPT_CLIENTID &&
704 otype != DHCPV6_OPT_SERVERID) {
705 odhcp6c_add_state(STATE_CUSTOM_OPTS,
706 &odata[-4], olen + 4);
714 static time_t dhcpv6_parse_ia(void *opt, void *end)
716 uint32_t timeout = UINT32_MAX; // Minimum timeout
717 uint16_t otype, olen;
720 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT,
721 0, 0, IN6ADDR_ANY_INIT, 0, 0};
724 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
725 if (otype == DHCPV6_OPT_IA_PREFIX) {
726 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
727 if (olen + 4U < sizeof(*prefix))
730 entry.valid = ntohl(prefix->valid);
731 entry.preferred = ntohl(prefix->preferred);
733 if (entry.preferred > entry.valid)
736 entry.length = prefix->prefix;
737 entry.target = prefix->addr;
739 odhcp6c_update_entry(STATE_IA_PD, &entry);
740 } else if (otype == DHCPV6_OPT_IA_ADDR) {
741 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
742 if (olen + 4U < sizeof(*addr))
745 entry.preferred = ntohl(addr->preferred);
746 entry.valid = ntohl(addr->valid);
748 if (entry.preferred > entry.valid)
752 entry.target = addr->addr;
754 odhcp6c_update_entry(STATE_IA_NA, &entry);
757 if (entry.valid > 0 && timeout > entry.valid)
758 timeout = entry.valid;