2 * Copyright (C) 2012-2014 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
45 #define DHCPV6_SOL_MAX_RT_MIN 60
46 #define DHCPV6_SOL_MAX_RT_MAX 86400
47 #define DHCPV6_INF_MAX_RT_MIN 60
48 #define DHCPV6_INF_MAX_RT_MAX 86400
50 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
51 const uint8_t transaction[3], enum dhcpv6_msg type,
52 const struct in6_addr *daddr);
54 static int dhcpv6_parse_ia(void *opt, void *end);
56 static int dhcpv6_calc_refresh_timers(void);
57 static void dhcpv6_handle_status_code(_unused const enum dhcpv6_msg orig,
58 const uint16_t code, const void *status_msg, const int len,
60 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig,
61 const struct dhcpv6_ia_hdr *ia_hdr, const uint16_t code,
62 const void *status_msg, const int len,
63 bool handled_status_codes[_DHCPV6_Status_Max],
65 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand *cand);
66 static void dhcpv6_clear_all_server_cand(void);
68 static reply_handler dhcpv6_handle_reply;
69 static reply_handler dhcpv6_handle_advert;
70 static reply_handler dhcpv6_handle_rebind_reply;
71 static reply_handler dhcpv6_handle_reconfigure;
72 static int dhcpv6_commit_advert(void);
76 // RFC 3315 - 5.5 Timeout and Delay values
77 static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
78 [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, 0, "<POLL>",
79 dhcpv6_handle_reconfigure, NULL},
80 [DHCPV6_MSG_SOLICIT] = {true, 1, DHCPV6_SOL_MAX_RT, 0, "SOLICIT",
81 dhcpv6_handle_advert, dhcpv6_commit_advert},
82 [DHCPV6_MSG_REQUEST] = {true, 1, DHCPV6_REQ_MAX_RT, 10, "REQUEST",
83 dhcpv6_handle_reply, NULL},
84 [DHCPV6_MSG_RENEW] = {false, 10, DHCPV6_REN_MAX_RT, 0, "RENEW",
85 dhcpv6_handle_reply, NULL},
86 [DHCPV6_MSG_REBIND] = {false, 10, DHCPV6_REB_MAX_RT, 0, "REBIND",
87 dhcpv6_handle_rebind_reply, NULL},
88 [DHCPV6_MSG_RELEASE] = {false, 1, 0, 5, "RELEASE", NULL, NULL},
89 [DHCPV6_MSG_DECLINE] = {false, 1, 0, 5, "DECLINE", NULL, NULL},
90 [DHCPV6_MSG_INFO_REQ] = {true, 1, DHCPV6_INF_MAX_RT, 0, "INFOREQ",
91 dhcpv6_handle_reply, NULL},
97 static int ifindex = -1;
98 static int64_t t1 = 0, t2 = 0, t3 = 0;
101 static int request_prefix = -1;
102 static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE, pd_mode = IA_MODE_NONE;
103 static bool accept_reconfig = false;
106 static uint8_t reconf_key[16];
109 static unsigned int client_options = 0;
112 int init_dhcpv6(const char *ifname, unsigned int options, int sol_timeout)
114 client_options = options;
115 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_timeout;
117 sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
123 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
124 if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0)
126 ifindex = ifr.ifr_ifindex;
128 // Create client DUID
129 size_t client_id_len;
130 odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
131 if (client_id_len == 0) {
132 uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
133 DHCPV6_DUID_LLADDR, 0, 1};
135 if (ioctl(sock, SIOCGIFHWADDR, &ifr) >= 0)
136 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
138 uint8_t zero[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
139 struct ifreq ifs[100], *ifp, *ifend;
142 ifc.ifc_len = sizeof(ifs);
144 if (!memcmp(&duid[8], zero, ETHER_ADDR_LEN) &&
145 ioctl(sock, SIOCGIFCONF, &ifc) >= 0) {
146 // If our interface doesn't have an address...
147 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
148 for (ifp = ifc.ifc_req; ifp < ifend &&
149 !memcmp(&duid[8], zero, ETHER_ADDR_LEN); ifp++) {
150 memcpy(ifr.ifr_name, ifp->ifr_name,
151 sizeof(ifr.ifr_name));
152 if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0)
155 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data,
160 odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
164 if (!(client_options & DHCPV6_STRICT_OPTIONS)) {
166 htons(DHCPV6_OPT_SIP_SERVER_D),
167 htons(DHCPV6_OPT_SIP_SERVER_A),
168 htons(DHCPV6_OPT_DNS_SERVERS),
169 htons(DHCPV6_OPT_DNS_DOMAIN),
170 htons(DHCPV6_OPT_SNTP_SERVERS),
171 htons(DHCPV6_OPT_NTP_SERVER),
172 htons(DHCPV6_OPT_AFTR_NAME),
173 htons(DHCPV6_OPT_PD_EXCLUDE),
174 htons(DHCPV6_OPT_SOL_MAX_RT),
175 htons(DHCPV6_OPT_INF_MAX_RT),
176 #ifdef EXT_PREFIX_CLASS
177 htons(DHCPV6_OPT_PREFIX_CLASS),
180 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
183 // Configure IPv6-options
185 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
186 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
187 setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val));
189 setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val, sizeof(val));
190 setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
192 struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
193 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
194 if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)) < 0)
206 IOV_VENDOR_CLASS_HDR,
218 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd)
224 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
228 gethostname(fqdn_buf, sizeof(fqdn_buf));
235 size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
236 sizeof(fqdn.data), NULL, NULL);
237 fqdn.type = htons(DHCPV6_OPT_FQDN);
238 fqdn.len = htons(fqdn_len - 4);
244 void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
248 void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
251 size_t ia_pd_entries, ia_pd_len = 0;
254 if (type == DHCPV6_MSG_SOLICIT) {
255 odhcp6c_clear_state(STATE_IA_PD);
257 struct odhcp6c_request_prefix *request_prefixes = odhcp6c_get_state(STATE_IA_PD_INIT, &n_prefixes);
258 n_prefixes /= sizeof(struct odhcp6c_request_prefix);
260 ia_pd = alloca(n_prefixes * (sizeof(struct dhcpv6_ia_hdr) + sizeof(struct dhcpv6_ia_prefix)));
262 for (size_t i = 0; i < n_prefixes; i++) {
263 struct dhcpv6_ia_hdr hdr_ia_pd = {
264 htons(DHCPV6_OPT_IA_PD),
265 htons(sizeof(hdr_ia_pd) - 4 + sizeof(struct dhcpv6_ia_prefix)),
266 request_prefixes[i].iaid, 0, 0
268 struct dhcpv6_ia_prefix pref = {
269 .type = htons(DHCPV6_OPT_IA_PREFIX),
270 .len = htons(25), .prefix = request_prefixes[i].length
272 memcpy(ia_pd + ia_pd_len, &hdr_ia_pd, sizeof(hdr_ia_pd));
273 ia_pd_len += sizeof(hdr_ia_pd);
274 memcpy(ia_pd + ia_pd_len, &pref, sizeof(pref));
275 ia_pd_len += sizeof(pref);
278 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
279 ia_pd_entries /= sizeof(*e);
281 // we're too lazy to count our distinct IAIDs,
282 // so just allocate maximally needed space
283 ia_pd = alloca(ia_pd_entries * (sizeof(struct dhcpv6_ia_prefix) + 10 +
284 sizeof(struct dhcpv6_ia_hdr)));
286 for (size_t i = 0; i < ia_pd_entries; ++i) {
287 uint32_t iaid = e[i].iaid;
289 // check if this is an unprocessed IAID and skip if not.
291 for (int j = i-1; j >= 0; j--) {
292 if (e[j].iaid == iaid) {
302 struct dhcpv6_ia_hdr hdr_ia_pd = {
303 htons(DHCPV6_OPT_IA_PD),
304 htons(sizeof(hdr_ia_pd) - 4),
308 memcpy(ia_pd + ia_pd_len, &hdr_ia_pd, sizeof(hdr_ia_pd));
309 struct dhcpv6_ia_hdr *hdr = (struct dhcpv6_ia_hdr *) (ia_pd + ia_pd_len);
310 ia_pd_len += sizeof(hdr_ia_pd);
312 for (size_t j = i; j < ia_pd_entries; j++) {
313 if (e[j].iaid != iaid)
317 if (e[j].priority > 0)
318 ex_len = ((e[j].priority - e[j].length - 1) / 8) + 6;
320 struct dhcpv6_ia_prefix p = {
321 .type = htons(DHCPV6_OPT_IA_PREFIX),
322 .len = htons(sizeof(p) - 4U + ex_len),
323 .prefix = e[j].length,
327 memcpy(ia_pd + ia_pd_len, &p, sizeof(p));
328 ia_pd_len += sizeof(p);
331 ia_pd[ia_pd_len++] = 0;
332 ia_pd[ia_pd_len++] = DHCPV6_OPT_PD_EXCLUDE;
333 ia_pd[ia_pd_len++] = 0;
334 ia_pd[ia_pd_len++] = ex_len - 4;
335 ia_pd[ia_pd_len++] = e[j].priority;
337 uint32_t excl = ntohl(e[j].router.s6_addr32[1]);
338 excl >>= (64 - e[j].priority);
339 excl <<= 8 - ((e[j].priority - e[j].length) % 8);
341 for (size_t i = ex_len - 5; i > 0; --i, excl >>= 8)
342 ia_pd[ia_pd_len + i] = excl & 0xff;
343 ia_pd_len += ex_len - 5;
346 hdr->len = htons(ntohs(hdr->len) + ntohs(p.len) + 4U);
351 if (ia_pd_entries > 0)
355 size_t ia_na_entries, ia_na_len = 0;
357 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
358 ia_na_entries /= sizeof(*e);
360 struct dhcpv6_ia_hdr hdr_ia_na = {
361 htons(DHCPV6_OPT_IA_NA),
362 htons(sizeof(hdr_ia_na) - 4),
366 struct dhcpv6_ia_addr pa[ia_na_entries];
367 for (size_t i = 0; i < ia_na_entries; ++i) {
368 pa[i].type = htons(DHCPV6_OPT_IA_ADDR);
369 pa[i].len = htons(sizeof(pa[i]) - 4U);
370 pa[i].addr = e[i].target;
376 ia_na_len = sizeof(pa);
377 hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
379 // Reconfigure Accept
383 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
385 // Request Information Refresh
386 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
388 // Build vendor-class option
389 size_t vendor_class_len, user_class_len;
390 struct dhcpv6_vendorclass *vendor_class = odhcp6c_get_state(STATE_VENDORCLASS, &vendor_class_len);
391 void *user_class = odhcp6c_get_state(STATE_USERCLASS, &user_class_len);
396 } vendor_class_hdr = {htons(DHCPV6_OPT_VENDOR_CLASS), htons(vendor_class_len)};
401 } user_class_hdr = {htons(DHCPV6_OPT_USER_CLASS), htons(user_class_len)};
405 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
409 uint16_t elapsed_type;
410 uint16_t elapsed_len;
411 uint16_t elapsed_value;
415 type, {trid[0], trid[1], trid[2]},
416 htons(DHCPV6_OPT_ELAPSED), htons(2),
417 htons((ecs > 0xffff) ? 0xffff : ecs),
418 htons(DHCPV6_OPT_ORO), htons(oro_len),
421 struct iovec iov[IOV_TOTAL] = {
422 [IOV_HDR] = {&hdr, sizeof(hdr)},
423 [IOV_ORO] = {oro, oro_len},
424 [IOV_ORO_REFRESH] = {&oro_refresh, 0},
425 [IOV_CL_ID] = {cl_id, cl_id_len},
426 [IOV_SRV_ID] = {srv_id, srv_id_len},
427 [IOV_VENDOR_CLASS_HDR] = {&vendor_class_hdr, vendor_class_len ? sizeof(vendor_class_hdr) : 0},
428 [IOV_VENDOR_CLASS] = {vendor_class, vendor_class_len},
429 [IOV_USER_CLASS_HDR] = {&user_class_hdr, user_class_len ? sizeof(user_class_hdr) : 0},
430 [IOV_USER_CLASS] = {user_class, user_class_len},
431 [IOV_RECONF_ACCEPT] = {&reconf_accept, sizeof(reconf_accept)},
432 [IOV_FQDN] = {&fqdn, fqdn_len},
433 [IOV_HDR_IA_NA] = {&hdr_ia_na, sizeof(hdr_ia_na)},
434 [IOV_IA_NA] = {ia_na, ia_na_len},
435 [IOV_IA_PD] = {ia_pd, ia_pd_len},
438 size_t cnt = IOV_TOTAL;
439 if (type == DHCPV6_MSG_INFO_REQ) {
441 iov[IOV_ORO_REFRESH].iov_len = sizeof(oro_refresh);
442 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
443 } else if (!request_prefix) {
447 // Disable IAs if not used
448 if (type != DHCPV6_MSG_SOLICIT && ia_na_len == 0)
449 iov[IOV_HDR_IA_NA].iov_len = 0;
451 if (na_mode == IA_MODE_NONE)
452 iov[IOV_HDR_IA_NA].iov_len = 0;
454 if ((type != DHCPV6_MSG_SOLICIT && type != DHCPV6_MSG_REQUEST) ||
455 !(client_options & DHCPV6_ACCEPT_RECONFIGURE))
456 iov[IOV_RECONF_ACCEPT].iov_len = 0;
458 if (!(client_options & DHCPV6_CLIENT_FQDN))
459 iov[IOV_FQDN].iov_len = 0;
461 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
462 0, ALL_DHCPV6_RELAYS, ifindex};
463 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
465 sendmsg(sock, &msg, 0);
469 static int64_t dhcpv6_rand_delay(int64_t time)
472 odhcp6c_random(&random, sizeof(random));
473 return (time * ((int64_t)random % 1000LL)) / 10000LL;
477 int dhcpv6_request(enum dhcpv6_msg type)
480 uint64_t timeout = UINT32_MAX;
481 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
484 struct timespec ts = {0, 0};
485 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
486 nanosleep(&ts, NULL);
489 if (type == DHCPV6_MSG_UNKNOWN)
491 else if (type == DHCPV6_MSG_RENEW)
492 timeout = (t2 > t1) ? t2 - t1 : ((t1 == UINT32_MAX) ? UINT32_MAX : 0);
493 else if (type == DHCPV6_MSG_REBIND)
494 timeout = (t3 > t2) ? t3 - t2 : ((t2 == UINT32_MAX) ? UINT32_MAX : 0);
499 syslog(LOG_NOTICE, "Starting %s transaction (timeout %llus, max rc %d)",
500 retx->name, (unsigned long long)timeout, retx->max_rc);
502 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
504 // Generate transaction ID
505 uint8_t trid[3] = {0, 0, 0};
506 if (type != DHCPV6_MSG_UNKNOWN)
507 odhcp6c_random(trid, sizeof(trid));
513 int64_t delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
515 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
516 while (type == DHCPV6_MSG_SOLICIT && delay <= 0)
517 delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
519 rto = (retx->init_timeo * 1000 + delay);
522 rto = (2 * rto + dhcpv6_rand_delay(rto));
524 if (retx->max_timeo && (rto >= retx->max_timeo * 1000))
525 rto = retx->max_timeo * 1000 +
526 dhcpv6_rand_delay(retx->max_timeo * 1000);
528 // Calculate end for this round and elapsed time
529 uint64_t round_end = round_start + rto;
530 elapsed = round_start - start;
532 // Don't wait too long if timeout differs from infinite
533 if ((timeout != UINT32_MAX) && (round_end - start > timeout * 1000))
534 round_end = timeout * 1000 + start;
536 // Built and send package
537 if (type != DHCPV6_MSG_UNKNOWN) {
538 if (type != DHCPV6_MSG_SOLICIT)
539 syslog(LOG_NOTICE, "Send %s message (elapsed %llums, rc %d)",
540 retx->name, (unsigned long long)elapsed, rc);
541 dhcpv6_send(type, trid, elapsed / 10);
546 for (; len < 0 && (round_start < round_end);
547 round_start = odhcp6c_get_milli_time()) {
548 uint8_t buf[1536], cmsg_buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
549 struct iovec iov = {buf, sizeof(buf)};
550 struct msghdr msg = {NULL, 0, &iov, 1,
551 cmsg_buf, sizeof(cmsg_buf), 0};
552 struct in6_pktinfo *pktinfo = NULL;
554 // Check for pending signal
555 if (odhcp6c_signal_process())
558 // Set timeout for receiving
559 uint64_t t = round_end - round_start;
560 struct timeval tv = {t / 1000, (t % 1000) * 1000};
561 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
565 len = recvmsg(sock, &msg, 0);
569 for (struct cmsghdr *ch = CMSG_FIRSTHDR(&msg); ch != NULL;
570 ch = CMSG_NXTHDR(&msg, ch)) {
571 if (ch->cmsg_level == SOL_IPV6 &&
572 ch->cmsg_type == IPV6_PKTINFO) {
573 pktinfo = (struct in6_pktinfo *)CMSG_DATA(ch);
578 if (pktinfo == NULL) {
583 if (!dhcpv6_response_is_valid(buf, len, trid,
584 type, &pktinfo->ipi6_addr)) {
589 uint8_t *opt = &buf[4];
590 uint8_t *opt_end = opt + len - 4;
592 round_start = odhcp6c_get_milli_time();
593 elapsed = round_start - start;
594 syslog(LOG_NOTICE, "Got a valid reply after "
595 "%llums", (unsigned long long)elapsed);
597 if (retx->handler_reply)
598 len = retx->handler_reply(type, rc, opt, opt_end);
600 if (len > 0 && round_end - round_start > 1000)
601 round_end = 1000 + round_start;
605 if (retx->handler_finish)
606 len = retx->handler_finish();
607 } while (len < 0 && ((timeout == UINT32_MAX) || (elapsed / 1000 < timeout)) &&
608 (!retx->max_rc || rc < retx->max_rc));
612 // Message validation checks according to RFC3315 chapter 15
613 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
614 const uint8_t transaction[3], enum dhcpv6_msg type,
615 const struct in6_addr *daddr)
617 const struct dhcpv6_header *rep = buf;
618 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
619 transaction, sizeof(rep->tr_id)))
620 return false; // Invalid reply
622 if (type == DHCPV6_MSG_SOLICIT) {
623 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
624 rep->msg_type != DHCPV6_MSG_REPLY)
626 } else if (type == DHCPV6_MSG_UNKNOWN) {
627 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
629 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
633 uint8_t *end = ((uint8_t*)buf) + len, *odata = NULL,
634 rcmsg = DHCPV6_MSG_UNKNOWN;
635 uint16_t otype, olen = UINT16_MAX;
636 bool clientid_ok = false, serverid_ok = false, rcauth_ok = false,
637 ia_present = false, options_valid = true;
639 size_t client_id_len, server_id_len;
640 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
641 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
643 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata) {
644 if (otype == DHCPV6_OPT_CLIENTID) {
645 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
646 &odata[-4], client_id, client_id_len);
647 } else if (otype == DHCPV6_OPT_SERVERID) {
649 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
650 &odata[-4], server_id, server_id_len);
653 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
654 sizeof(struct dhcpv6_auth_reconfigure)) {
655 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
656 if (r->protocol != 3 || r->algorithm != 1 || r->reconf_type != 2)
660 uint8_t serverhash[16], secretbytes[16], hash[16];
661 memcpy(serverhash, r->key, sizeof(serverhash));
662 memset(r->key, 0, sizeof(r->key));
663 memcpy(secretbytes, reconf_key, sizeof(secretbytes));
665 for (size_t i = 0; i < sizeof(secretbytes); ++i)
666 secretbytes[i] ^= 0x36;
669 md5_hash(secretbytes, sizeof(secretbytes), &md5);
670 md5_hash(buf, len, &md5);
673 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
674 secretbytes[i] ^= 0x36;
675 secretbytes[i] ^= 0x5c;
679 md5_hash(secretbytes, sizeof(secretbytes), &md5);
680 md5_hash(hash, 16, &md5);
683 rcauth_ok = !memcmp(hash, serverhash, sizeof(hash));
684 } else if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1) {
686 } else if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)) {
688 if (olen < sizeof(struct dhcpv6_ia_hdr))
689 options_valid = false;
691 else if ((otype == DHCPV6_OPT_IA_ADDR) || (otype == DHCPV6_OPT_IA_PREFIX) ||
692 (otype == DHCPV6_OPT_PD_EXCLUDE)) {
693 // Options are not allowed on global level
694 options_valid = false;
698 if (!options_valid || ((odata + olen) > end))
701 if (type == DHCPV6_MSG_INFO_REQ && ia_present)
704 if (rep->msg_type == DHCPV6_MSG_RECONF) {
705 if ((rcmsg != DHCPV6_MSG_RENEW && rcmsg != DHCPV6_MSG_INFO_REQ) ||
706 (rcmsg == DHCPV6_MSG_INFO_REQ && ia_present) ||
707 !rcauth_ok || IN6_IS_ADDR_MULTICAST(daddr))
711 return clientid_ok && serverid_ok;
715 int dhcpv6_poll_reconfigure(void)
717 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
719 ret = dhcpv6_request(ret);
725 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig, const int rc,
726 const void *opt, const void *end)
728 uint16_t otype, olen;
729 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
730 dhcpv6_for_each_option(opt, end, otype, olen, odata)
731 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
732 odata[0] == DHCPV6_MSG_RENEW ||
733 odata[0] == DHCPV6_MSG_INFO_REQ))
736 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, rc, NULL, NULL);
741 // Collect all advertised servers
742 static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
743 const void *opt, const void *end)
745 uint16_t olen, otype;
746 uint8_t *odata, pref = 0;
747 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0},
749 DHCPV6_INF_MAX_RT, NULL, NULL, 0, 0};
750 bool have_na = false;
753 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
754 if (orig == DHCPV6_MSG_SOLICIT &&
755 (otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA) &&
756 olen > sizeof(struct dhcpv6_ia_hdr)) {
757 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
758 dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
761 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
762 memcpy(cand.duid, odata, olen);
763 cand.duid_len = olen;
764 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
765 int error = ((int)odata[0] << 8 | (int)odata[1]);
768 case DHCPV6_NoPrefixAvail:
769 // Status code on global level
770 cand.preference -= 2000;
776 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
777 cand.preference >= 0) {
778 cand.preference = pref = odata[0];
779 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
780 cand.wants_reconfigure = true;
781 } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
782 uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
783 if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
784 sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
785 cand.sol_max_rt = sol_max_rt;
786 } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
787 uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
788 if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
789 inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
790 cand.inf_max_rt = inf_max_rt;
791 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
792 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
793 uint8_t *oend = odata + olen, *d;
794 dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
795 if (otype == DHCPV6_OPT_IA_PREFIX && (olen + 4) >=
796 (uint16_t)sizeof(struct dhcpv6_ia_prefix)) {
797 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&d[-4];
801 } else if (otype == DHCPV6_OPT_IA_NA) {
802 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
803 uint8_t *oend = odata + olen, *d;
804 dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
805 if (otype == DHCPV6_OPT_IA_ADDR)
810 if ((!have_na && na_mode == IA_MODE_FORCE) ||
811 (!have_pd && pd_mode == IA_MODE_FORCE)) {
813 * RFC7083 states to process the SOL_MAX_RT and
814 * INF_MAX_RT options even if the DHCPv6 server
815 * did not propose any IA_NA and/or IA_PD
817 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand.sol_max_rt;
818 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand.inf_max_rt;
822 if (na_mode != IA_MODE_NONE && !have_na) {
823 cand.has_noaddravail = true;
824 cand.preference -= 1000;
827 if (pd_mode != IA_MODE_NONE) {
829 cand.preference += 2000 + (128 - have_pd);
831 cand.preference -= 2000;
834 if (cand.duid_len > 0) {
835 cand.ia_na = odhcp6c_move_state(STATE_IA_NA, &cand.ia_na_len);
836 cand.ia_pd = odhcp6c_move_state(STATE_IA_PD, &cand.ia_pd_len);
837 dhcpv6_add_server_cand(&cand);
840 return (rc > 1 || (pref == 255 && cand.preference > 0)) ? 1 : -1;
844 static int dhcpv6_commit_advert(void)
846 return dhcpv6_promote_server_cand();
850 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig, const int rc,
851 const void *opt, const void *end)
853 dhcpv6_handle_advert(orig, rc, opt, end);
854 if (dhcpv6_commit_advert() < 0)
857 return dhcpv6_handle_reply(orig, rc, opt, end);
861 static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc,
862 const void *opt, const void *end)
865 uint16_t otype, olen;
866 uint32_t refresh = UINT32_MAX;
868 bool handled_status_codes[_DHCPV6_Status_Max] = { false, };
872 if (orig == DHCPV6_MSG_UNKNOWN) {
873 static time_t last_update = 0;
874 time_t now = odhcp6c_get_milli_time() / 1000;
876 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
879 if (t1 != UINT32_MAX)
882 if (t2 != UINT32_MAX)
885 if (t3 != UINT32_MAX)
898 if (orig == DHCPV6_MSG_REQUEST && !odhcp6c_is_bound()) {
899 // Delete NA and PD we have in the state from the Advert
900 odhcp6c_clear_state(STATE_IA_NA);
901 odhcp6c_clear_state(STATE_IA_PD);
905 odhcp6c_clear_state(STATE_DNS);
906 odhcp6c_clear_state(STATE_SEARCH);
907 odhcp6c_clear_state(STATE_SNTP_IP);
908 odhcp6c_clear_state(STATE_NTP_IP);
909 odhcp6c_clear_state(STATE_NTP_FQDN);
910 odhcp6c_clear_state(STATE_SIP_IP);
911 odhcp6c_clear_state(STATE_SIP_FQDN);
912 odhcp6c_clear_state(STATE_AFTR_NAME);
915 // Parse and find all matching IAs
916 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
917 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
918 && olen > sizeof(struct dhcpv6_ia_hdr)) {
919 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
922 if (ia_hdr->iaid != 1 && otype == DHCPV6_OPT_IA_NA)
925 uint16_t code = DHCPV6_Success;
926 uint16_t stype, slen;
928 // Get and handle status code
929 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
930 stype, slen, sdata) {
931 if (stype == DHCPV6_OPT_STATUS && slen >= 2) {
932 uint8_t *mdata = (slen > 2) ? &sdata[2] : NULL;
933 uint16_t mlen = (slen > 2) ? slen - 2 : 0;
935 code = ((int)sdata[0]) << 8 | ((int)sdata[1]);
937 if (code == DHCPV6_Success)
940 dhcpv6_handle_ia_status_code(orig, ia_hdr,
941 code, mdata, mlen, handled_status_codes, &ret);
950 if (code != DHCPV6_Success)
953 dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
954 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
955 uint8_t *mdata = (olen > 2) ? &odata[2] : NULL;
956 uint16_t mlen = (olen > 2) ? olen - 2 : 0;
957 uint16_t code = ((int)odata[0]) << 8 | ((int)odata[1]);
959 dhcpv6_handle_status_code(orig, code, mdata, mlen, &ret);
961 else if (otype == DHCPV6_OPT_DNS_SERVERS) {
963 odhcp6c_add_state(STATE_DNS, odata, olen);
964 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
965 odhcp6c_add_state(STATE_SEARCH, odata, olen);
966 } else if (otype == DHCPV6_OPT_SNTP_SERVERS) {
968 odhcp6c_add_state(STATE_SNTP_IP, odata, olen);
969 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
970 uint16_t stype, slen;
972 // Test status and bail if error
973 dhcpv6_for_each_option(odata, odata + olen,
974 stype, slen, sdata) {
975 if (slen == 16 && (stype == NTP_MC_ADDR ||
976 stype == NTP_SRV_ADDR))
977 odhcp6c_add_state(STATE_NTP_IP,
979 else if (slen > 0 && stype == NTP_SRV_FQDN)
980 odhcp6c_add_state(STATE_NTP_FQDN,
983 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
985 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
986 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
987 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
988 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
989 refresh = ntohl(*((uint32_t*)odata));
990 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
991 sizeof(struct dhcpv6_auth_reconfigure)) {
992 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
993 if (r->protocol == 3 && r->algorithm == 1 &&
995 memcpy(reconf_key, r->key, sizeof(r->key));
996 } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) {
998 odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
1000 odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
1001 } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
1002 uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
1003 if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
1004 sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
1005 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_max_rt;
1006 } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
1007 uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
1008 if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
1009 inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
1010 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = inf_max_rt;
1011 }else if (otype != DHCPV6_OPT_CLIENTID &&
1012 otype != DHCPV6_OPT_SERVERID) {
1013 odhcp6c_add_state(STATE_CUSTOM_OPTS,
1014 &odata[-4], olen + 4);
1018 if (orig != DHCPV6_MSG_INFO_REQ) {
1019 // Update refresh timers if no fatal status code was received
1020 if ((ret > 0) && dhcpv6_calc_refresh_timers()) {
1022 case DHCPV6_MSG_RENEW:
1023 // Send further renews if T1 is not set
1027 case DHCPV6_MSG_REBIND:
1028 // Send further rebinds if T1 and T2 is not set
1033 case DHCPV6_MSG_REQUEST:
1034 // All server candidates can be cleared if not yet bound
1035 if (!odhcp6c_is_bound())
1036 dhcpv6_clear_all_server_cand();
1044 // All server candidates can be cleared if not yet bound
1045 if (!odhcp6c_is_bound())
1046 dhcpv6_clear_all_server_cand();
1055 static int dhcpv6_parse_ia(void *opt, void *end)
1057 struct dhcpv6_ia_hdr *ia_hdr = (struct dhcpv6_ia_hdr *)opt;
1060 uint16_t otype, olen;
1063 t1 = ntohl(ia_hdr->t1);
1064 t2 = ntohl(ia_hdr->t2);
1069 // Update address IA
1070 dhcpv6_for_each_option(&ia_hdr[1], end, otype, olen, odata) {
1071 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
1072 IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0, 0};
1074 entry.iaid = ia_hdr->iaid;
1076 if (otype == DHCPV6_OPT_IA_PREFIX) {
1077 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
1078 if (olen + 4U < sizeof(*prefix))
1081 entry.valid = ntohl(prefix->valid);
1082 entry.preferred = ntohl(prefix->preferred);
1084 if (entry.preferred > entry.valid)
1087 entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1088 entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1089 if (entry.t1 > entry.t2)
1090 entry.t1 = entry.t2;
1092 entry.length = prefix->prefix;
1093 entry.target = prefix->addr;
1094 uint16_t stype, slen;
1097 #ifdef EXT_PREFIX_CLASS
1098 // Find prefix class, if any
1099 dhcpv6_for_each_option(&prefix[1], odata + olen,
1101 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
1102 entry.class = sdata[0] << 8 | sdata[1];
1107 dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
1108 odata + olen, stype, slen, sdata) {
1109 if (stype != DHCPV6_OPT_PD_EXCLUDE || slen < 2)
1112 uint8_t elen = sdata[0];
1116 if (elen <= 32 || elen <= entry.length) {
1122 uint8_t bytes = ((elen - entry.length - 1) / 8) + 1;
1123 if (slen <= bytes) {
1128 uint32_t exclude = 0;
1130 exclude = exclude << 8 | sdata[bytes];
1133 exclude >>= 8 - ((elen - entry.length) % 8);
1134 exclude <<= 64 - elen;
1136 // Abusing router & priority fields for exclusion
1137 entry.router = entry.target;
1138 entry.router.s6_addr32[1] |= htonl(exclude);
1139 entry.priority = elen;
1143 odhcp6c_update_entry(STATE_IA_PD, &entry);
1148 memset(&entry.router, 0, sizeof(entry.router));
1149 } else if (otype == DHCPV6_OPT_IA_ADDR) {
1150 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
1151 if (olen + 4U < sizeof(*addr))
1154 entry.preferred = ntohl(addr->preferred);
1155 entry.valid = ntohl(addr->valid);
1157 if (entry.preferred > entry.valid)
1160 entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1161 entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1162 if (entry.t1 > entry.t2)
1163 entry.t1 = entry.t2;
1166 entry.target = addr->addr;
1168 #ifdef EXT_PREFIX_CLASS
1169 uint16_t stype, slen;
1171 // Find prefix class, if any
1172 dhcpv6_for_each_option(&addr[1], odata + olen,
1174 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
1175 entry.class = sdata[0] << 8 | sdata[1];
1178 odhcp6c_update_entry(STATE_IA_NA, &entry);
1186 static int dhcpv6_calc_refresh_timers(void)
1188 struct odhcp6c_entry *e;
1189 size_t ia_na_entries, ia_pd_entries, i;
1190 int64_t l_t1 = UINT32_MAX, l_t2 = UINT32_MAX, l_t3 = 0;
1192 e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
1193 ia_na_entries /= sizeof(*e);
1194 for (i = 0; i < ia_na_entries; i++) {
1201 if (e[i].valid > l_t3)
1205 e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
1206 ia_pd_entries /= sizeof(*e);
1207 for (i = 0; i < ia_pd_entries; i++) {
1214 if (e[i].valid > l_t3)
1218 if (ia_pd_entries || ia_na_entries) {
1226 return (int)(ia_pd_entries + ia_na_entries);
1230 static void dhcpv6_log_status_code(const uint16_t code, const char *scope,
1231 const void *status_msg, const int len)
1233 uint8_t buf[len + 3];
1235 memset(buf, 0, sizeof(buf));
1238 memcpy(&buf[1], status_msg, len);
1242 syslog(LOG_WARNING, "Server returned %s status %i %s",
1247 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig,
1248 const uint16_t code, const void *status_msg, const int len,
1251 dhcpv6_log_status_code(code, "message", status_msg, len);
1254 case DHCPV6_UnspecFail:
1259 case DHCPV6_UseMulticast:
1260 // TODO handle multicast status code
1263 case DHCPV6_NoAddrsAvail:
1264 case DHCPV6_NoPrefixAvail:
1265 if (orig == DHCPV6_MSG_REQUEST)
1266 *ret = 0; // Failure
1275 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig,
1276 const struct dhcpv6_ia_hdr *ia_hdr, const uint16_t code,
1277 const void *status_msg, const int len,
1278 bool handled_status_codes[_DHCPV6_Status_Max], int *ret)
1280 dhcpv6_log_status_code(code, ia_hdr->type == DHCPV6_OPT_IA_NA ?
1281 "IA_NA" : "IA_PD", status_msg, len);
1284 case DHCPV6_NoBinding:
1286 case DHCPV6_MSG_RENEW:
1287 case DHCPV6_MSG_REBIND:
1288 if ((*ret > 0) && !handled_status_codes[code])
1289 *ret = dhcpv6_request(DHCPV6_MSG_REQUEST);
1297 case DHCPV6_NoAddrsAvail:
1298 case DHCPV6_NoPrefixAvail:
1300 case DHCPV6_MSG_REQUEST:
1309 case DHCPV6_NotOnLink:
1310 // TODO handle not onlink in case of confirm
1318 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand *cand)
1321 struct dhcpv6_server_cand *c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1323 // Remove identical duid server candidate
1324 for (i = 0; i < cand_len / sizeof(*c); ++i) {
1325 if (cand->duid_len == c[i].duid_len &&
1326 !memcmp(cand->duid, c[i].duid, cand->duid_len)) {
1329 odhcp6c_remove_state(STATE_SERVER_CAND, i * sizeof(*c), sizeof(*c));
1334 for (i = 0, c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1335 i < cand_len / sizeof(*c); ++i) {
1336 if (c[i].preference < cand->preference)
1340 odhcp6c_insert_state(STATE_SERVER_CAND, i * sizeof(*c), cand, sizeof(*cand));
1343 static void dhcpv6_clear_all_server_cand(void)
1346 struct dhcpv6_server_cand *c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1348 // Server candidates need deep delete for IA_NA/IA_PD
1349 for (i = 0; i < cand_len / sizeof(*c); ++i) {
1353 odhcp6c_clear_state(STATE_SERVER_CAND);
1356 int dhcpv6_promote_server_cand(void)
1359 struct dhcpv6_server_cand *cand = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1361 int ret = (na_mode == IA_MODE_NONE && pd_mode == IA_MODE_NONE) ?
1362 DHCPV6_STATELESS : DHCPV6_STATEFUL;
1364 // Clear lingering candidate state info
1365 odhcp6c_clear_state(STATE_SERVER_ID);
1366 odhcp6c_clear_state(STATE_IA_NA);
1367 odhcp6c_clear_state(STATE_IA_PD);
1372 if (cand->has_noaddravail && na_mode == IA_MODE_TRY) {
1373 na_mode = IA_MODE_NONE;
1375 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
1376 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
1378 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
1381 hdr[0] = htons(DHCPV6_OPT_SERVERID);
1382 hdr[1] = htons(cand->duid_len);
1383 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
1384 odhcp6c_add_state(STATE_SERVER_ID, cand->duid, cand->duid_len);
1385 accept_reconfig = cand->wants_reconfigure;
1386 if (cand->ia_na_len) {
1387 odhcp6c_add_state(STATE_IA_NA, cand->ia_na, cand->ia_na_len);
1389 if (na_mode != IA_MODE_NONE)
1390 ret = DHCPV6_STATEFUL;
1392 if (cand->ia_pd_len) {
1393 odhcp6c_add_state(STATE_IA_PD, cand->ia_pd, cand->ia_pd_len);
1396 ret = DHCPV6_STATEFUL;
1399 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
1400 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
1402 odhcp6c_remove_state(STATE_SERVER_CAND, 0, sizeof(*cand));