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 htons(DHCPV6_OPT_CER_ID),
183 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
186 // Configure IPv6-options
188 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
189 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
190 setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val));
192 setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
194 struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
195 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
196 if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)) < 0)
208 IOV_VENDOR_CLASS_HDR,
220 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd)
226 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
230 gethostname(fqdn_buf, sizeof(fqdn_buf));
237 size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
238 sizeof(fqdn.data), NULL, NULL);
239 fqdn.type = htons(DHCPV6_OPT_FQDN);
240 fqdn.len = htons(fqdn_len - 4);
246 void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
250 void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
253 size_t ia_pd_entries = 0, ia_pd_len = 0;
256 if (type == DHCPV6_MSG_SOLICIT) {
257 odhcp6c_clear_state(STATE_IA_PD);
259 struct odhcp6c_request_prefix *request_prefixes = odhcp6c_get_state(STATE_IA_PD_INIT, &n_prefixes);
260 n_prefixes /= sizeof(struct odhcp6c_request_prefix);
262 ia_pd = alloca(n_prefixes * (sizeof(struct dhcpv6_ia_hdr) + sizeof(struct dhcpv6_ia_prefix)));
264 for (size_t i = 0; i < n_prefixes; i++) {
265 struct dhcpv6_ia_hdr hdr_ia_pd = {
266 htons(DHCPV6_OPT_IA_PD),
267 htons(sizeof(hdr_ia_pd) - 4 + sizeof(struct dhcpv6_ia_prefix)),
268 request_prefixes[i].iaid, 0, 0
270 struct dhcpv6_ia_prefix pref = {
271 .type = htons(DHCPV6_OPT_IA_PREFIX),
272 .len = htons(25), .prefix = request_prefixes[i].length
274 memcpy(ia_pd + ia_pd_len, &hdr_ia_pd, sizeof(hdr_ia_pd));
275 ia_pd_len += sizeof(hdr_ia_pd);
276 memcpy(ia_pd + ia_pd_len, &pref, sizeof(pref));
277 ia_pd_len += sizeof(pref);
280 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
281 ia_pd_entries /= sizeof(*e);
283 // we're too lazy to count our distinct IAIDs,
284 // so just allocate maximally needed space
285 ia_pd = alloca(ia_pd_entries * (sizeof(struct dhcpv6_ia_prefix) + 10 +
286 sizeof(struct dhcpv6_ia_hdr)));
288 for (size_t i = 0; i < ia_pd_entries; ++i) {
289 uint32_t iaid = e[i].iaid;
291 // check if this is an unprocessed IAID and skip if not.
293 for (int j = i-1; j >= 0; j--) {
294 if (e[j].iaid == iaid) {
304 struct dhcpv6_ia_hdr hdr_ia_pd = {
305 htons(DHCPV6_OPT_IA_PD),
306 htons(sizeof(hdr_ia_pd) - 4),
310 memcpy(ia_pd + ia_pd_len, &hdr_ia_pd, sizeof(hdr_ia_pd));
311 struct dhcpv6_ia_hdr *hdr = (struct dhcpv6_ia_hdr *) (ia_pd + ia_pd_len);
312 ia_pd_len += sizeof(hdr_ia_pd);
314 for (size_t j = i; j < ia_pd_entries; j++) {
315 if (e[j].iaid != iaid)
319 if (e[j].priority > 0)
320 ex_len = ((e[j].priority - e[j].length - 1) / 8) + 6;
322 struct dhcpv6_ia_prefix p = {
323 .type = htons(DHCPV6_OPT_IA_PREFIX),
324 .len = htons(sizeof(p) - 4U + ex_len),
325 .prefix = e[j].length,
329 memcpy(ia_pd + ia_pd_len, &p, sizeof(p));
330 ia_pd_len += sizeof(p);
333 ia_pd[ia_pd_len++] = 0;
334 ia_pd[ia_pd_len++] = DHCPV6_OPT_PD_EXCLUDE;
335 ia_pd[ia_pd_len++] = 0;
336 ia_pd[ia_pd_len++] = ex_len - 4;
337 ia_pd[ia_pd_len++] = e[j].priority;
339 uint32_t excl = ntohl(e[j].router.s6_addr32[1]);
340 excl >>= (64 - e[j].priority);
341 excl <<= 8 - ((e[j].priority - e[j].length) % 8);
343 for (size_t i = ex_len - 5; i > 0; --i, excl >>= 8)
344 ia_pd[ia_pd_len + i] = excl & 0xff;
345 ia_pd_len += ex_len - 5;
348 hdr->len = htons(ntohs(hdr->len) + ntohs(p.len) + 4U);
353 if (ia_pd_entries > 0)
357 size_t ia_na_entries, ia_na_len = 0;
359 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
360 ia_na_entries /= sizeof(*e);
362 struct dhcpv6_ia_hdr hdr_ia_na = {
363 htons(DHCPV6_OPT_IA_NA),
364 htons(sizeof(hdr_ia_na) - 4),
368 struct dhcpv6_ia_addr pa[ia_na_entries];
369 for (size_t i = 0; i < ia_na_entries; ++i) {
370 pa[i].type = htons(DHCPV6_OPT_IA_ADDR);
371 pa[i].len = htons(sizeof(pa[i]) - 4U);
372 pa[i].addr = e[i].target;
378 ia_na_len = sizeof(pa);
379 hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
381 // Reconfigure Accept
385 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
387 // Request Information Refresh
388 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
390 // Build vendor-class option
391 size_t vendor_class_len, user_class_len;
392 struct dhcpv6_vendorclass *vendor_class = odhcp6c_get_state(STATE_VENDORCLASS, &vendor_class_len);
393 void *user_class = odhcp6c_get_state(STATE_USERCLASS, &user_class_len);
398 } vendor_class_hdr = {htons(DHCPV6_OPT_VENDOR_CLASS), htons(vendor_class_len)};
403 } user_class_hdr = {htons(DHCPV6_OPT_USER_CLASS), htons(user_class_len)};
407 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
411 uint16_t elapsed_type;
412 uint16_t elapsed_len;
413 uint16_t elapsed_value;
417 type, {trid[0], trid[1], trid[2]},
418 htons(DHCPV6_OPT_ELAPSED), htons(2),
419 htons((ecs > 0xffff) ? 0xffff : ecs),
420 htons(DHCPV6_OPT_ORO), htons(oro_len),
423 struct iovec iov[IOV_TOTAL] = {
424 [IOV_HDR] = {&hdr, sizeof(hdr)},
425 [IOV_ORO] = {oro, oro_len},
426 [IOV_ORO_REFRESH] = {&oro_refresh, 0},
427 [IOV_CL_ID] = {cl_id, cl_id_len},
428 [IOV_SRV_ID] = {srv_id, srv_id_len},
429 [IOV_VENDOR_CLASS_HDR] = {&vendor_class_hdr, vendor_class_len ? sizeof(vendor_class_hdr) : 0},
430 [IOV_VENDOR_CLASS] = {vendor_class, vendor_class_len},
431 [IOV_USER_CLASS_HDR] = {&user_class_hdr, user_class_len ? sizeof(user_class_hdr) : 0},
432 [IOV_USER_CLASS] = {user_class, user_class_len},
433 [IOV_RECONF_ACCEPT] = {&reconf_accept, sizeof(reconf_accept)},
434 [IOV_FQDN] = {&fqdn, fqdn_len},
435 [IOV_HDR_IA_NA] = {&hdr_ia_na, sizeof(hdr_ia_na)},
436 [IOV_IA_NA] = {ia_na, ia_na_len},
437 [IOV_IA_PD] = {ia_pd, ia_pd_len},
440 size_t cnt = IOV_TOTAL;
441 if (type == DHCPV6_MSG_INFO_REQ) {
443 iov[IOV_ORO_REFRESH].iov_len = sizeof(oro_refresh);
444 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
445 } else if (!request_prefix) {
449 // Disable IAs if not used
450 if (type != DHCPV6_MSG_SOLICIT && ia_na_len == 0)
451 iov[IOV_HDR_IA_NA].iov_len = 0;
453 if (na_mode == IA_MODE_NONE)
454 iov[IOV_HDR_IA_NA].iov_len = 0;
456 if ((type != DHCPV6_MSG_SOLICIT && type != DHCPV6_MSG_REQUEST) ||
457 !(client_options & DHCPV6_ACCEPT_RECONFIGURE))
458 iov[IOV_RECONF_ACCEPT].iov_len = 0;
460 if (!(client_options & DHCPV6_CLIENT_FQDN))
461 iov[IOV_FQDN].iov_len = 0;
463 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
464 0, ALL_DHCPV6_RELAYS, ifindex};
465 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
467 sendmsg(sock, &msg, 0);
471 static int64_t dhcpv6_rand_delay(int64_t time)
474 odhcp6c_random(&random, sizeof(random));
475 return (time * ((int64_t)random % 1000LL)) / 10000LL;
479 int dhcpv6_request(enum dhcpv6_msg type)
482 uint64_t timeout = UINT32_MAX;
483 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
486 struct timespec ts = {0, 0};
487 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
488 nanosleep(&ts, NULL);
491 if (type == DHCPV6_MSG_UNKNOWN)
493 else if (type == DHCPV6_MSG_RENEW)
494 timeout = (t2 > t1) ? t2 - t1 : ((t1 == UINT32_MAX) ? UINT32_MAX : 0);
495 else if (type == DHCPV6_MSG_REBIND)
496 timeout = (t3 > t2) ? t3 - t2 : ((t2 == UINT32_MAX) ? UINT32_MAX : 0);
501 syslog(LOG_NOTICE, "Starting %s transaction (timeout %llus, max rc %d)",
502 retx->name, (unsigned long long)timeout, retx->max_rc);
504 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
506 // Generate transaction ID
507 uint8_t trid[3] = {0, 0, 0};
508 if (type != DHCPV6_MSG_UNKNOWN)
509 odhcp6c_random(trid, sizeof(trid));
515 int64_t delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
517 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
518 while (type == DHCPV6_MSG_SOLICIT && delay <= 0)
519 delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
521 rto = (retx->init_timeo * 1000 + delay);
524 rto = (2 * rto + dhcpv6_rand_delay(rto));
526 if (retx->max_timeo && (rto >= retx->max_timeo * 1000))
527 rto = retx->max_timeo * 1000 +
528 dhcpv6_rand_delay(retx->max_timeo * 1000);
530 // Calculate end for this round and elapsed time
531 uint64_t round_end = round_start + rto;
532 elapsed = round_start - start;
534 // Don't wait too long if timeout differs from infinite
535 if ((timeout != UINT32_MAX) && (round_end - start > timeout * 1000))
536 round_end = timeout * 1000 + start;
538 // Built and send package
539 if (type != DHCPV6_MSG_UNKNOWN) {
540 if (type != DHCPV6_MSG_SOLICIT)
541 syslog(LOG_NOTICE, "Send %s message (elapsed %llums, rc %d)",
542 retx->name, (unsigned long long)elapsed, rc);
543 dhcpv6_send(type, trid, elapsed / 10);
548 for (; len < 0 && (round_start < round_end);
549 round_start = odhcp6c_get_milli_time()) {
550 uint8_t buf[1536], cmsg_buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
551 struct iovec iov = {buf, sizeof(buf)};
552 struct msghdr msg = {NULL, 0, &iov, 1,
553 cmsg_buf, sizeof(cmsg_buf), 0};
554 struct in6_pktinfo *pktinfo = NULL;
556 // Check for pending signal
557 if (odhcp6c_signal_process())
560 // Set timeout for receiving
561 uint64_t t = round_end - round_start;
562 struct timeval tv = {t / 1000, (t % 1000) * 1000};
563 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
567 len = recvmsg(sock, &msg, 0);
571 for (struct cmsghdr *ch = CMSG_FIRSTHDR(&msg); ch != NULL;
572 ch = CMSG_NXTHDR(&msg, ch)) {
573 if (ch->cmsg_level == SOL_IPV6 &&
574 ch->cmsg_type == IPV6_PKTINFO) {
575 pktinfo = (struct in6_pktinfo *)CMSG_DATA(ch);
580 if (pktinfo == NULL) {
585 if (!dhcpv6_response_is_valid(buf, len, trid,
586 type, &pktinfo->ipi6_addr)) {
591 uint8_t *opt = &buf[4];
592 uint8_t *opt_end = opt + len - 4;
594 round_start = odhcp6c_get_milli_time();
595 elapsed = round_start - start;
596 syslog(LOG_NOTICE, "Got a valid reply after "
597 "%llums", (unsigned long long)elapsed);
599 if (retx->handler_reply)
600 len = retx->handler_reply(type, rc, opt, opt_end);
602 if (len > 0 && round_end - round_start > 1000)
603 round_end = 1000 + round_start;
607 if (retx->handler_finish)
608 len = retx->handler_finish();
609 } while (len < 0 && ((timeout == UINT32_MAX) || (elapsed / 1000 < timeout)) &&
610 (!retx->max_rc || rc < retx->max_rc));
614 // Message validation checks according to RFC3315 chapter 15
615 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
616 const uint8_t transaction[3], enum dhcpv6_msg type,
617 const struct in6_addr *daddr)
619 const struct dhcpv6_header *rep = buf;
620 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
621 transaction, sizeof(rep->tr_id)))
622 return false; // Invalid reply
624 if (type == DHCPV6_MSG_SOLICIT) {
625 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
626 rep->msg_type != DHCPV6_MSG_REPLY)
628 } else if (type == DHCPV6_MSG_UNKNOWN) {
629 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
631 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
635 uint8_t *end = ((uint8_t*)buf) + len, *odata = NULL,
636 rcmsg = DHCPV6_MSG_UNKNOWN;
637 uint16_t otype, olen = UINT16_MAX;
638 bool clientid_ok = false, serverid_ok = false, rcauth_ok = false,
639 ia_present = false, options_valid = true;
641 size_t client_id_len, server_id_len;
642 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
643 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
645 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata) {
646 if (otype == DHCPV6_OPT_CLIENTID) {
647 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
648 &odata[-4], client_id, client_id_len);
649 } else if (otype == DHCPV6_OPT_SERVERID) {
651 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
652 &odata[-4], server_id, server_id_len);
655 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
656 sizeof(struct dhcpv6_auth_reconfigure)) {
657 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
658 if (r->protocol != 3 || r->algorithm != 1 || r->reconf_type != 2)
662 uint8_t serverhash[16], secretbytes[64], hash[16];
663 memcpy(serverhash, r->key, sizeof(serverhash));
664 memset(r->key, 0, sizeof(r->key));
666 memset(secretbytes, 0, sizeof(secretbytes));
667 memcpy(secretbytes, reconf_key, sizeof(reconf_key));
669 for (size_t i = 0; i < sizeof(secretbytes); ++i)
670 secretbytes[i] ^= 0x36;
673 md5_hash(secretbytes, sizeof(secretbytes), &md5);
674 md5_hash(buf, len, &md5);
677 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
678 secretbytes[i] ^= 0x36;
679 secretbytes[i] ^= 0x5c;
683 md5_hash(secretbytes, sizeof(secretbytes), &md5);
684 md5_hash(hash, 16, &md5);
687 rcauth_ok = !memcmp(hash, serverhash, sizeof(hash));
688 } else if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1) {
690 } else if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)) {
692 if (olen < sizeof(struct dhcpv6_ia_hdr))
693 options_valid = false;
695 else if ((otype == DHCPV6_OPT_IA_ADDR) || (otype == DHCPV6_OPT_IA_PREFIX) ||
696 (otype == DHCPV6_OPT_PD_EXCLUDE)) {
697 // Options are not allowed on global level
698 options_valid = false;
702 if (!options_valid || ((odata + olen) > end))
705 if (type == DHCPV6_MSG_INFO_REQ && ia_present)
708 if (rep->msg_type == DHCPV6_MSG_RECONF) {
709 if ((rcmsg != DHCPV6_MSG_RENEW && rcmsg != DHCPV6_MSG_INFO_REQ) ||
710 (rcmsg == DHCPV6_MSG_INFO_REQ && ia_present) ||
711 !rcauth_ok || IN6_IS_ADDR_MULTICAST(daddr))
715 return clientid_ok && serverid_ok;
719 int dhcpv6_poll_reconfigure(void)
721 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
723 ret = dhcpv6_request(ret);
729 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig, const int rc,
730 const void *opt, const void *end)
732 uint16_t otype, olen;
733 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
734 dhcpv6_for_each_option(opt, end, otype, olen, odata)
735 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
736 odata[0] == DHCPV6_MSG_RENEW ||
737 odata[0] == DHCPV6_MSG_INFO_REQ))
740 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, rc, NULL, NULL);
745 // Collect all advertised servers
746 static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
747 const void *opt, const void *end)
749 uint16_t olen, otype;
750 uint8_t *odata, pref = 0;
751 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0},
753 DHCPV6_INF_MAX_RT, NULL, NULL, 0, 0};
754 bool have_na = false;
757 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
758 if (orig == DHCPV6_MSG_SOLICIT &&
759 (otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA) &&
760 olen > sizeof(struct dhcpv6_ia_hdr)) {
761 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
762 dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
765 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
766 memcpy(cand.duid, odata, olen);
767 cand.duid_len = olen;
768 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
769 int error = ((int)odata[0] << 8 | (int)odata[1]);
772 case DHCPV6_NoPrefixAvail:
773 // Status code on global level
774 cand.preference -= 2000;
780 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
781 cand.preference >= 0) {
782 cand.preference = pref = odata[0];
783 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
784 cand.wants_reconfigure = true;
785 } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
786 uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
787 if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
788 sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
789 cand.sol_max_rt = sol_max_rt;
790 } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
791 uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
792 if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
793 inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
794 cand.inf_max_rt = inf_max_rt;
795 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
796 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
797 uint8_t *oend = odata + olen, *d;
798 dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
799 if (otype == DHCPV6_OPT_IA_PREFIX && (olen + 4) >=
800 (uint16_t)sizeof(struct dhcpv6_ia_prefix)) {
801 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&d[-4];
805 } else if (otype == DHCPV6_OPT_IA_NA) {
806 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
807 uint8_t *oend = odata + olen, *d;
808 dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
809 if (otype == DHCPV6_OPT_IA_ADDR)
814 if ((!have_na && na_mode == IA_MODE_FORCE) ||
815 (!have_pd && pd_mode == IA_MODE_FORCE)) {
817 * RFC7083 states to process the SOL_MAX_RT and
818 * INF_MAX_RT options even if the DHCPv6 server
819 * did not propose any IA_NA and/or IA_PD
821 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand.sol_max_rt;
822 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand.inf_max_rt;
826 if (na_mode != IA_MODE_NONE && !have_na) {
827 cand.has_noaddravail = true;
828 cand.preference -= 1000;
831 if (pd_mode != IA_MODE_NONE) {
833 cand.preference += 2000 + (128 - have_pd);
835 cand.preference -= 2000;
838 if (cand.duid_len > 0) {
839 cand.ia_na = odhcp6c_move_state(STATE_IA_NA, &cand.ia_na_len);
840 cand.ia_pd = odhcp6c_move_state(STATE_IA_PD, &cand.ia_pd_len);
841 dhcpv6_add_server_cand(&cand);
844 return (rc > 1 || (pref == 255 && cand.preference > 0)) ? 1 : -1;
848 static int dhcpv6_commit_advert(void)
850 return dhcpv6_promote_server_cand();
854 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig, const int rc,
855 const void *opt, const void *end)
857 dhcpv6_handle_advert(orig, rc, opt, end);
858 if (dhcpv6_commit_advert() < 0)
861 return dhcpv6_handle_reply(orig, rc, opt, end);
865 static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc,
866 const void *opt, const void *end)
869 uint16_t otype, olen;
870 uint32_t refresh = UINT32_MAX;
872 bool handled_status_codes[_DHCPV6_Status_Max] = { false, };
876 if (orig == DHCPV6_MSG_UNKNOWN) {
877 static time_t last_update = 0;
878 time_t now = odhcp6c_get_milli_time() / 1000;
880 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
883 if (t1 != UINT32_MAX)
886 if (t2 != UINT32_MAX)
889 if (t3 != UINT32_MAX)
902 if (orig == DHCPV6_MSG_REQUEST && !odhcp6c_is_bound()) {
903 // Delete NA and PD we have in the state from the Advert
904 odhcp6c_clear_state(STATE_IA_NA);
905 odhcp6c_clear_state(STATE_IA_PD);
909 odhcp6c_clear_state(STATE_DNS);
910 odhcp6c_clear_state(STATE_SEARCH);
911 odhcp6c_clear_state(STATE_SNTP_IP);
912 odhcp6c_clear_state(STATE_NTP_IP);
913 odhcp6c_clear_state(STATE_NTP_FQDN);
914 odhcp6c_clear_state(STATE_SIP_IP);
915 odhcp6c_clear_state(STATE_SIP_FQDN);
916 odhcp6c_clear_state(STATE_AFTR_NAME);
917 odhcp6c_clear_state(STATE_CER);
920 // Parse and find all matching IAs
921 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
922 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
923 && olen > sizeof(struct dhcpv6_ia_hdr)) {
924 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
927 if (ia_hdr->iaid != 1 && otype == DHCPV6_OPT_IA_NA)
930 uint16_t code = DHCPV6_Success;
931 uint16_t stype, slen;
933 // Get and handle status code
934 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
935 stype, slen, sdata) {
936 if (stype == DHCPV6_OPT_STATUS && slen >= 2) {
937 uint8_t *mdata = (slen > 2) ? &sdata[2] : NULL;
938 uint16_t mlen = (slen > 2) ? slen - 2 : 0;
940 code = ((int)sdata[0]) << 8 | ((int)sdata[1]);
942 if (code == DHCPV6_Success)
945 dhcpv6_handle_ia_status_code(orig, ia_hdr,
946 code, mdata, mlen, handled_status_codes, &ret);
955 if (code != DHCPV6_Success)
958 dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
959 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
960 uint8_t *mdata = (olen > 2) ? &odata[2] : NULL;
961 uint16_t mlen = (olen > 2) ? olen - 2 : 0;
962 uint16_t code = ((int)odata[0]) << 8 | ((int)odata[1]);
964 dhcpv6_handle_status_code(orig, code, mdata, mlen, &ret);
966 else if (otype == DHCPV6_OPT_DNS_SERVERS) {
968 odhcp6c_add_state(STATE_DNS, odata, olen);
969 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
970 odhcp6c_add_state(STATE_SEARCH, odata, olen);
971 } else if (otype == DHCPV6_OPT_SNTP_SERVERS) {
973 odhcp6c_add_state(STATE_SNTP_IP, odata, olen);
974 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
975 uint16_t stype, slen;
977 // Test status and bail if error
978 dhcpv6_for_each_option(odata, odata + olen,
979 stype, slen, sdata) {
980 if (slen == 16 && (stype == NTP_MC_ADDR ||
981 stype == NTP_SRV_ADDR))
982 odhcp6c_add_state(STATE_NTP_IP,
984 else if (slen > 0 && stype == NTP_SRV_FQDN)
985 odhcp6c_add_state(STATE_NTP_FQDN,
988 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
990 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
991 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
992 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
993 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
994 refresh = ntohl(*((uint32_t*)odata));
995 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
996 sizeof(struct dhcpv6_auth_reconfigure)) {
997 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
998 if (r->protocol == 3 && r->algorithm == 1 &&
1000 memcpy(reconf_key, r->key, sizeof(r->key));
1001 } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) {
1003 odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
1005 odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
1006 } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
1007 uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
1008 if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
1009 sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
1010 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_max_rt;
1011 } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
1012 uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
1013 if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
1014 inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
1015 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = inf_max_rt;
1017 } else if (otype == DHCPV6_OPT_CER_ID && olen == -4 +
1018 sizeof(struct dhcpv6_cer_id)) {
1019 struct dhcpv6_cer_id *cer_id = (void*)&odata[-4];
1020 struct in6_addr any = IN6ADDR_ANY_INIT;
1021 if (memcmp(&cer_id->addr, &any, sizeof(any)))
1022 odhcp6c_add_state(STATE_CER, &cer_id->addr, sizeof(any));
1024 } else if (otype != DHCPV6_OPT_CLIENTID &&
1025 otype != DHCPV6_OPT_SERVERID) {
1026 odhcp6c_add_state(STATE_CUSTOM_OPTS,
1027 &odata[-4], olen + 4);
1031 if (orig != DHCPV6_MSG_INFO_REQ) {
1032 // Update refresh timers if no fatal status code was received
1033 if ((ret > 0) && dhcpv6_calc_refresh_timers()) {
1035 case DHCPV6_MSG_RENEW:
1036 // Send further renews if T1 is not set
1040 case DHCPV6_MSG_REBIND:
1041 // Send further rebinds if T1 and T2 is not set
1046 case DHCPV6_MSG_REQUEST:
1047 // All server candidates can be cleared if not yet bound
1048 if (!odhcp6c_is_bound())
1049 dhcpv6_clear_all_server_cand();
1057 // All server candidates can be cleared if not yet bound
1058 if (!odhcp6c_is_bound())
1059 dhcpv6_clear_all_server_cand();
1068 static int dhcpv6_parse_ia(void *opt, void *end)
1070 struct dhcpv6_ia_hdr *ia_hdr = (struct dhcpv6_ia_hdr *)opt;
1073 uint16_t otype, olen;
1076 t1 = ntohl(ia_hdr->t1);
1077 t2 = ntohl(ia_hdr->t2);
1082 // Update address IA
1083 dhcpv6_for_each_option(&ia_hdr[1], end, otype, olen, odata) {
1084 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
1085 IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0, 0};
1087 entry.iaid = ia_hdr->iaid;
1089 if (otype == DHCPV6_OPT_IA_PREFIX) {
1090 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
1091 if (olen + 4U < sizeof(*prefix))
1094 entry.valid = ntohl(prefix->valid);
1095 entry.preferred = ntohl(prefix->preferred);
1097 if (entry.preferred > entry.valid)
1100 entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1101 entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1102 if (entry.t1 > entry.t2)
1103 entry.t1 = entry.t2;
1105 entry.length = prefix->prefix;
1106 entry.target = prefix->addr;
1107 uint16_t stype, slen;
1110 #ifdef EXT_PREFIX_CLASS
1111 // Find prefix class, if any
1112 dhcpv6_for_each_option(&prefix[1], odata + olen,
1114 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
1115 entry.class = sdata[0] << 8 | sdata[1];
1120 dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
1121 odata + olen, stype, slen, sdata) {
1122 if (stype != DHCPV6_OPT_PD_EXCLUDE || slen < 2)
1125 uint8_t elen = sdata[0];
1129 if (elen <= 32 || elen <= entry.length) {
1135 uint8_t bytes = ((elen - entry.length - 1) / 8) + 1;
1136 if (slen <= bytes) {
1141 uint32_t exclude = 0;
1143 exclude = exclude << 8 | sdata[bytes];
1146 exclude >>= 8 - ((elen - entry.length) % 8);
1147 exclude <<= 64 - elen;
1149 // Abusing router & priority fields for exclusion
1150 entry.router = entry.target;
1151 entry.router.s6_addr32[1] |= htonl(exclude);
1152 entry.priority = elen;
1156 odhcp6c_update_entry(STATE_IA_PD, &entry);
1161 memset(&entry.router, 0, sizeof(entry.router));
1162 } else if (otype == DHCPV6_OPT_IA_ADDR) {
1163 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
1164 if (olen + 4U < sizeof(*addr))
1167 entry.preferred = ntohl(addr->preferred);
1168 entry.valid = ntohl(addr->valid);
1170 if (entry.preferred > entry.valid)
1173 entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1174 entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1175 if (entry.t1 > entry.t2)
1176 entry.t1 = entry.t2;
1179 entry.target = addr->addr;
1181 #ifdef EXT_PREFIX_CLASS
1182 uint16_t stype, slen;
1184 // Find prefix class, if any
1185 dhcpv6_for_each_option(&addr[1], odata + olen,
1187 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
1188 entry.class = sdata[0] << 8 | sdata[1];
1191 odhcp6c_update_entry(STATE_IA_NA, &entry);
1199 static int dhcpv6_calc_refresh_timers(void)
1201 struct odhcp6c_entry *e;
1202 size_t ia_na_entries, ia_pd_entries, i;
1203 int64_t l_t1 = UINT32_MAX, l_t2 = UINT32_MAX, l_t3 = 0;
1205 e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
1206 ia_na_entries /= sizeof(*e);
1207 for (i = 0; i < ia_na_entries; i++) {
1214 if (e[i].valid > l_t3)
1218 e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
1219 ia_pd_entries /= sizeof(*e);
1220 for (i = 0; i < ia_pd_entries; i++) {
1227 if (e[i].valid > l_t3)
1231 if (ia_pd_entries || ia_na_entries) {
1239 return (int)(ia_pd_entries + ia_na_entries);
1243 static void dhcpv6_log_status_code(const uint16_t code, const char *scope,
1244 const void *status_msg, const int len)
1246 uint8_t buf[len + 3];
1248 memset(buf, 0, sizeof(buf));
1251 memcpy(&buf[1], status_msg, len);
1255 syslog(LOG_WARNING, "Server returned %s status %i %s",
1260 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig,
1261 const uint16_t code, const void *status_msg, const int len,
1264 dhcpv6_log_status_code(code, "message", status_msg, len);
1267 case DHCPV6_UnspecFail:
1272 case DHCPV6_UseMulticast:
1273 // TODO handle multicast status code
1276 case DHCPV6_NoAddrsAvail:
1277 case DHCPV6_NoPrefixAvail:
1278 if (orig == DHCPV6_MSG_REQUEST)
1279 *ret = 0; // Failure
1288 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig,
1289 const struct dhcpv6_ia_hdr *ia_hdr, const uint16_t code,
1290 const void *status_msg, const int len,
1291 bool handled_status_codes[_DHCPV6_Status_Max], int *ret)
1293 dhcpv6_log_status_code(code, ia_hdr->type == DHCPV6_OPT_IA_NA ?
1294 "IA_NA" : "IA_PD", status_msg, len);
1297 case DHCPV6_NoBinding:
1299 case DHCPV6_MSG_RENEW:
1300 case DHCPV6_MSG_REBIND:
1301 if ((*ret > 0) && !handled_status_codes[code])
1302 *ret = dhcpv6_request(DHCPV6_MSG_REQUEST);
1310 case DHCPV6_NoAddrsAvail:
1311 case DHCPV6_NoPrefixAvail:
1313 case DHCPV6_MSG_REQUEST:
1322 case DHCPV6_NotOnLink:
1323 // TODO handle not onlink in case of confirm
1331 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand *cand)
1334 struct dhcpv6_server_cand *c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1336 // Remove identical duid server candidate
1337 for (i = 0; i < cand_len / sizeof(*c); ++i) {
1338 if (cand->duid_len == c[i].duid_len &&
1339 !memcmp(cand->duid, c[i].duid, cand->duid_len)) {
1342 odhcp6c_remove_state(STATE_SERVER_CAND, i * sizeof(*c), sizeof(*c));
1347 for (i = 0, c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1348 i < cand_len / sizeof(*c); ++i) {
1349 if (c[i].preference < cand->preference)
1353 odhcp6c_insert_state(STATE_SERVER_CAND, i * sizeof(*c), cand, sizeof(*cand));
1356 static void dhcpv6_clear_all_server_cand(void)
1359 struct dhcpv6_server_cand *c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1361 // Server candidates need deep delete for IA_NA/IA_PD
1362 for (i = 0; i < cand_len / sizeof(*c); ++i) {
1366 odhcp6c_clear_state(STATE_SERVER_CAND);
1369 int dhcpv6_promote_server_cand(void)
1372 struct dhcpv6_server_cand *cand = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1374 int ret = (na_mode == IA_MODE_NONE && pd_mode == IA_MODE_NONE) ?
1375 DHCPV6_STATELESS : DHCPV6_STATEFUL;
1377 // Clear lingering candidate state info
1378 odhcp6c_clear_state(STATE_SERVER_ID);
1379 odhcp6c_clear_state(STATE_IA_NA);
1380 odhcp6c_clear_state(STATE_IA_PD);
1385 if (cand->has_noaddravail && na_mode == IA_MODE_TRY) {
1386 na_mode = IA_MODE_NONE;
1388 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
1389 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
1391 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
1394 hdr[0] = htons(DHCPV6_OPT_SERVERID);
1395 hdr[1] = htons(cand->duid_len);
1396 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
1397 odhcp6c_add_state(STATE_SERVER_ID, cand->duid, cand->duid_len);
1398 accept_reconfig = cand->wants_reconfigure;
1399 if (cand->ia_na_len) {
1400 odhcp6c_add_state(STATE_IA_NA, cand->ia_na, cand->ia_na_len);
1402 if (na_mode != IA_MODE_NONE)
1403 ret = DHCPV6_STATEFUL;
1405 if (cand->ia_pd_len) {
1406 odhcp6c_add_state(STATE_IA_PD, cand->ia_pd, cand->ia_pd_len);
1409 ret = DHCPV6_STATEFUL;
1412 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
1413 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
1415 odhcp6c_remove_state(STATE_SERVER_CAND, 0, sizeof(*cand));