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),
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 hdr_ia_pd.len = htons(ntohs(hdr_ia_pd.len) + ia_pd_len);
219 } else if (request_prefix > 0 &&
220 (type == DHCPV6_MSG_SOLICIT ||
221 type == DHCPV6_MSG_REQUEST)) {
223 ia_pd_len = sizeof(pref);
224 hdr_ia_pd.len = htons(ntohs(hdr_ia_pd.len) + ia_pd_len);
228 size_t ia_na_entry_len, ia_na_len = 0;
230 void *ia_na_entries = odhcp6c_get_state(STATE_IA_NA, &ia_na_entry_len);
231 struct dhcpv6_ia_hdr hdr_ia_na = {
232 htons(DHCPV6_OPT_IA_NA),
233 htons(sizeof(hdr_ia_na) - 4),
237 if (ia_na_entry_len > 0) {
238 struct odhcp6c_entry *e = ia_na_entries;
239 size_t entries = ia_na_entry_len / sizeof(*e);
240 struct dhcpv6_ia_addr p[entries];
241 for (size_t i = 0; i < entries; ++i) {
242 p[i].type = htons(DHCPV6_OPT_IA_ADDR);
243 p[i].len = htons(sizeof(p[i]) - 4U);
244 p[i].addr = e[i].target;
245 p[i].preferred = htonl(e[i].preferred);
246 p[i].valid = htonl(e[i].valid);
249 ia_na_len = sizeof(p);
250 hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
253 // Reconfigure Accept
257 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
259 // Request Information Refresh
260 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
264 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
268 uint16_t elapsed_type;
269 uint16_t elapsed_len;
270 uint16_t elapsed_value;
274 type, {trid[0], trid[1], trid[2]},
275 htons(DHCPV6_OPT_ELAPSED), htons(2),
276 htons((ecs > 0xffff) ? 0xffff : ecs),
277 htons(DHCPV6_OPT_ORO), htons(oro_len),
280 struct iovec iov[] = {
285 {srv_id, srv_id_len},
288 {&hdr_ia_na, sizeof(hdr_ia_na)},
290 {&hdr_ia_pd, sizeof(hdr_ia_pd)},
294 size_t cnt = ARRAY_SIZE(iov);
295 if (type == DHCPV6_MSG_INFO_REQ) {
297 iov[2].iov_len = sizeof(oro_refresh);
298 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
299 } else if (!request_prefix) {
303 // Disable IAs if not used
304 if (type == DHCPV6_MSG_SOLICIT) {
305 iov[5].iov_len = sizeof(reconf_accept);
306 } else if (type != DHCPV6_MSG_REQUEST) {
313 if (na_mode == IA_MODE_NONE)
316 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
317 0, ALL_DHCPV6_RELAYS, ifindex};
318 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
320 sendmsg(sock, &msg, 0);
324 static int64_t dhcpv6_rand_delay(int64_t time)
327 odhcp6c_random(&random, sizeof(random));
328 return (time * (random % 1000)) / 10000;
332 int dhcpv6_request(enum dhcpv6_msg type)
335 uint32_t timeout = UINT32_MAX;
336 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
339 struct timespec ts = {0, 0};
340 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
341 nanosleep(&ts, NULL);
344 if (type == DHCPV6_MSG_RELEASE || type == DHCPV6_MSG_DECLINE)
346 else if (type == DHCPV6_MSG_UNKNOWN)
348 else if (type == DHCPV6_MSG_RENEW)
350 else if (type == DHCPV6_MSG_REBIND)
356 syslog(LOG_NOTICE, "Sending %s (timeout %us)", retx->name, timeout);
358 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
360 // Generate transaction ID
362 odhcp6c_random(trid, sizeof(trid));
367 rto = (rto == 0) ? (retx->init_timeo * 1000 +
368 dhcpv6_rand_delay(retx->init_timeo * 1000)) :
369 (2 * rto + dhcpv6_rand_delay(rto));
371 if (rto >= retx->max_timeo * 1000)
372 rto = retx->max_timeo * 1000 +
373 dhcpv6_rand_delay(retx->max_timeo * 1000);
375 // Calculate end for this round and elapsed time
376 uint64_t round_end = round_start + rto;
377 elapsed = round_start - start;
379 // Don't wait too long
380 if (round_end - start > timeout * 1000)
381 round_end = timeout * 1000 + start;
383 // Built and send package
384 if (type != DHCPV6_MSG_UNKNOWN)
385 dhcpv6_send(type, trid, elapsed / 10);
388 for (; len < 0 && round_start < round_end;
389 round_start = odhcp6c_get_milli_time()) {
390 // Check for pending signal
391 if (odhcp6c_signal_process())
394 // Set timeout for receiving
395 uint64_t t = round_end - round_start;
396 struct timeval timeout = {t / 1000, (t % 1000) * 1000};
397 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
398 &timeout, sizeof(timeout));
401 len = recv(sock, buf, sizeof(buf), 0);
403 if (!dhcpv6_response_is_valid(buf, len, trid, type))
407 uint8_t *opt = &buf[4];
408 uint8_t *opt_end = opt + len - 4;
410 round_start = odhcp6c_get_milli_time();
411 elapsed = round_start - start;
412 syslog(LOG_NOTICE, "Got a valid reply after "
413 "%ums", (unsigned)elapsed);
415 if (retx->handler_reply)
416 len = retx->handler_reply(
419 if (round_end - round_start > 1000)
420 round_end = 1000 + round_start;
425 if (retx->handler_finish)
426 len = retx->handler_finish();
427 } while (len < 0 && elapsed / 1000 < timeout);
433 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
434 const uint8_t transaction[3], enum dhcpv6_msg type)
436 const struct dhcpv6_header *rep = buf;
437 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
438 transaction, sizeof(rep->tr_id)))
439 return false; // Invalid reply
441 if (type == DHCPV6_MSG_SOLICIT) {
442 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
443 rep->msg_type != DHCPV6_MSG_REPLY)
445 } else if (type == DHCPV6_MSG_UNKNOWN) {
446 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
448 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
452 uint8_t *end = ((uint8_t*)buf) + len, *odata;
453 uint16_t otype, olen;
454 bool clientid_ok = false, serverid_ok = false;
456 size_t client_id_len, server_id_len;
457 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
458 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
460 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata)
461 if (otype == DHCPV6_OPT_CLIENTID)
462 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
463 &odata[-4], client_id, client_id_len);
464 else if (otype == DHCPV6_OPT_SERVERID)
465 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
466 &odata[-4], server_id, server_id_len);
468 return clientid_ok && (serverid_ok || server_id_len == 0);
472 int dhcpv6_poll_reconfigure(void)
474 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
476 ret = dhcpv6_request(ret);
482 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig,
483 const void *opt, const void *end)
485 // TODO: should verify the reconfigure message
486 uint16_t otype, olen;
487 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
488 dhcpv6_for_each_option(opt, end, otype, olen, odata)
489 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
490 odata[0] == DHCPV6_MSG_RENEW ||
491 odata[0] == DHCPV6_MSG_INFO_REQ))
494 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
499 // Collect all advertised servers
500 static int dhcpv6_handle_advert(_unused enum dhcpv6_msg orig,
501 const void *opt, const void *end)
503 uint16_t olen, otype;
505 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}};
507 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
508 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
509 memcpy(cand.duid, odata, olen);
510 cand.duid_len = olen;
511 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 && !odata[0]
512 && odata[1] == DHCPV6_NoAddrsAvail) {
513 if (na_mode == IA_MODE_FORCE) {
516 cand.has_noaddravail = true;
517 cand.preference -= 1000;
519 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 && !odata[0]
520 && odata[1] == DHCPV6_NoPrefixAvail) {
521 cand.preference -= 2000;
522 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
523 cand.preference >= 0) {
524 cand.preference = odata[1];
525 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
526 cand.wants_reconfigure = true;
527 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
528 struct dhcpv6_ia_hdr *h = (void*)odata;
529 uint8_t *oend = odata + olen, *d;
530 dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
531 if (otype == DHCPV6_OPT_IA_PREFIX)
532 cand.preference += 2000;
533 else if (otype == DHCPV6_OPT_STATUS &&
534 olen >= 2 && d[0] == 0 &&
535 d[1] == DHCPV6_NoPrefixAvail)
536 cand.preference -= 2000;
541 if (cand.duid_len > 0)
542 odhcp6c_add_state(STATE_SERVER_CAND, &cand, sizeof(cand));
548 static int dhcpv6_commit_advert(void)
551 struct dhcpv6_server_cand *c = NULL, *cand =
552 odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
555 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
556 if (cand[i].has_noaddravail)
557 retry = true; // We want to try again
559 if (!c || c->preference < cand[i].preference)
563 if (retry && na_mode == IA_MODE_TRY) {
564 // We give it a second try without the IA_NA
565 na_mode = IA_MODE_NONE;
566 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
570 uint16_t hdr[2] = {htons(DHCPV6_OPT_SERVERID),
572 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
573 odhcp6c_add_state(STATE_SERVER_ID, c->duid, c->duid_len);
574 accept_reconfig = c->wants_reconfigure;
577 odhcp6c_clear_state(STATE_SERVER_CAND);
581 else if (request_prefix || na_mode != IA_MODE_NONE)
582 return DHCPV6_STATEFUL;
584 return DHCPV6_STATELESS;
588 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig,
589 const void *opt, const void *end)
591 dhcpv6_handle_advert(orig, opt, end);
592 if (dhcpv6_commit_advert() < 0) {
593 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
597 return dhcpv6_handle_reply(orig, opt, end);
601 static int dhcpv6_handle_reply(enum dhcpv6_msg orig,
602 const void *opt, const void *end)
605 uint16_t otype, olen;
607 static time_t last_update = 0;
608 time_t now = odhcp6c_get_milli_time() / 1000;
610 uint32_t elapsed = now - last_update;
613 if (orig == DHCPV6_MSG_UNKNOWN) {
627 t1 = t2 = t3 = 86400;
631 odhcp6c_clear_state(STATE_DNS);
632 odhcp6c_clear_state(STATE_SEARCH);
633 odhcp6c_clear_state(STATE_SNTP_IP);
634 odhcp6c_clear_state(STATE_SNTP_FQDN);
635 odhcp6c_clear_state(STATE_SIP_IP);
636 odhcp6c_clear_state(STATE_SIP_FQDN);
639 // Parse and find all matching IAs
640 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
641 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
642 && olen > sizeof(struct dhcpv6_ia_hdr)) {
643 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
644 time_t l_t1 = ntohl(ia_hdr->t1);
645 time_t l_t2 = ntohl(ia_hdr->t2);
647 // Test ID and T1-T2 validity
648 if (ia_hdr->iaid != 1 || l_t2 < l_t1)
651 uint16_t stype, slen;
653 // Test status and bail if error
654 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
656 if (stype == DHCPV6_OPT_STATUS && slen >= 2 &&
657 (sdata[0] || sdata[1]))
661 if (l_t1 > 0 && t1 > l_t1)
664 if (l_t2 > 0 && t2 > l_t2)
667 time_t n = dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
678 } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
680 odhcp6c_add_state(STATE_DNS, odata, olen);
681 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
682 odhcp6c_add_state(STATE_SEARCH, odata, olen);
683 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
684 uint16_t stype, slen;
686 // Test status and bail if error
687 dhcpv6_for_each_option(odata, odata + olen,
688 stype, slen, sdata) {
689 if (slen == 16 && (stype == NTP_MC_ADDR ||
690 stype == NTP_SRV_ADDR))
691 odhcp6c_add_state(STATE_SNTP_IP,
693 else if (slen > 0 && stype == NTP_SRV_FQDN)
694 odhcp6c_add_state(STATE_SNTP_FQDN,
697 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
699 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
700 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
701 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
702 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
703 uint32_t refresh = ntohl(*((uint32_t*)odata));
704 if (refresh < (uint32_t)t1)
706 } else if (otype != DHCPV6_OPT_CLIENTID &&
707 otype != DHCPV6_OPT_SERVERID) {
708 odhcp6c_add_state(STATE_CUSTOM_OPTS,
709 &odata[-4], olen + 4);
717 static time_t dhcpv6_parse_ia(void *opt, void *end)
719 uint32_t timeout = UINT32_MAX; // Minimum timeout
720 uint16_t otype, olen;
723 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT,
724 0, 0, IN6ADDR_ANY_INIT, 0, 0};
727 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
728 if (otype == DHCPV6_OPT_IA_PREFIX) {
729 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
730 if (olen + 4U < sizeof(*prefix))
733 entry.valid = ntohl(prefix->valid);
734 entry.preferred = ntohl(prefix->preferred);
736 if (entry.preferred > entry.valid)
739 entry.length = prefix->prefix;
740 entry.target = prefix->addr;
742 odhcp6c_update_entry(STATE_IA_PD, &entry);
743 } else if (otype == DHCPV6_OPT_IA_ADDR) {
744 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
745 if (olen + 4U < sizeof(*addr))
748 entry.preferred = ntohl(addr->preferred);
749 entry.valid = ntohl(addr->valid);
751 if (entry.preferred > entry.valid)
755 entry.target = addr->addr;
757 odhcp6c_update_entry(STATE_IA_NA, &entry);
760 if (entry.valid > 0 && timeout > entry.valid)
761 timeout = entry.valid;