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),
182 htons(DHCPV6_OPT_S46_CONT_MAPE),
183 htons(DHCPV6_OPT_S46_CONT_MAPT),
184 htons(DHCPV6_OPT_S46_CONT_LW),
186 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
189 // Configure IPv6-options
191 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
192 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
193 setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val));
194 setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
196 struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
197 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
198 if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)) < 0)
210 IOV_VENDOR_CLASS_HDR,
222 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd)
228 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
232 gethostname(fqdn_buf, sizeof(fqdn_buf));
239 size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
240 sizeof(fqdn.data), NULL, NULL);
241 fqdn.type = htons(DHCPV6_OPT_FQDN);
242 fqdn.len = htons(fqdn_len - 4);
248 void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
252 void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
255 size_t ia_pd_entries = 0, ia_pd_len = 0;
258 if (type == DHCPV6_MSG_SOLICIT) {
259 odhcp6c_clear_state(STATE_IA_PD);
261 struct odhcp6c_request_prefix *request_prefixes = odhcp6c_get_state(STATE_IA_PD_INIT, &n_prefixes);
262 n_prefixes /= sizeof(struct odhcp6c_request_prefix);
264 ia_pd = alloca(n_prefixes * (sizeof(struct dhcpv6_ia_hdr) + sizeof(struct dhcpv6_ia_prefix)));
266 for (size_t i = 0; i < n_prefixes; i++) {
267 struct dhcpv6_ia_hdr hdr_ia_pd = {
268 htons(DHCPV6_OPT_IA_PD),
269 htons(sizeof(hdr_ia_pd) - 4 + sizeof(struct dhcpv6_ia_prefix)),
270 request_prefixes[i].iaid, 0, 0
272 struct dhcpv6_ia_prefix pref = {
273 .type = htons(DHCPV6_OPT_IA_PREFIX),
274 .len = htons(25), .prefix = request_prefixes[i].length
276 memcpy(ia_pd + ia_pd_len, &hdr_ia_pd, sizeof(hdr_ia_pd));
277 ia_pd_len += sizeof(hdr_ia_pd);
278 memcpy(ia_pd + ia_pd_len, &pref, sizeof(pref));
279 ia_pd_len += sizeof(pref);
282 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
283 ia_pd_entries /= sizeof(*e);
285 // we're too lazy to count our distinct IAIDs,
286 // so just allocate maximally needed space
287 ia_pd = alloca(ia_pd_entries * (sizeof(struct dhcpv6_ia_prefix) + 10 +
288 sizeof(struct dhcpv6_ia_hdr)));
290 for (size_t i = 0; i < ia_pd_entries; ++i) {
291 uint32_t iaid = e[i].iaid;
293 // check if this is an unprocessed IAID and skip if not.
295 for (int j = i-1; j >= 0; j--) {
296 if (e[j].iaid == iaid) {
306 struct dhcpv6_ia_hdr hdr_ia_pd = {
307 htons(DHCPV6_OPT_IA_PD),
308 htons(sizeof(hdr_ia_pd) - 4),
312 memcpy(ia_pd + ia_pd_len, &hdr_ia_pd, sizeof(hdr_ia_pd));
313 struct dhcpv6_ia_hdr *hdr = (struct dhcpv6_ia_hdr *) (ia_pd + ia_pd_len);
314 ia_pd_len += sizeof(hdr_ia_pd);
316 for (size_t j = i; j < ia_pd_entries; j++) {
317 if (e[j].iaid != iaid)
321 if (e[j].priority > 0)
322 ex_len = ((e[j].priority - e[j].length - 1) / 8) + 6;
324 struct dhcpv6_ia_prefix p = {
325 .type = htons(DHCPV6_OPT_IA_PREFIX),
326 .len = htons(sizeof(p) - 4U + ex_len),
327 .prefix = e[j].length,
331 memcpy(ia_pd + ia_pd_len, &p, sizeof(p));
332 ia_pd_len += sizeof(p);
335 ia_pd[ia_pd_len++] = 0;
336 ia_pd[ia_pd_len++] = DHCPV6_OPT_PD_EXCLUDE;
337 ia_pd[ia_pd_len++] = 0;
338 ia_pd[ia_pd_len++] = ex_len - 4;
339 ia_pd[ia_pd_len++] = e[j].priority;
341 uint32_t excl = ntohl(e[j].router.s6_addr32[1]);
342 excl >>= (64 - e[j].priority);
343 excl <<= 8 - ((e[j].priority - e[j].length) % 8);
345 for (size_t i = ex_len - 5; i > 0; --i, excl >>= 8)
346 ia_pd[ia_pd_len + i] = excl & 0xff;
347 ia_pd_len += ex_len - 5;
350 hdr->len = htons(ntohs(hdr->len) + ntohs(p.len) + 4U);
355 if (ia_pd_entries > 0)
359 size_t ia_na_entries, ia_na_len = 0;
361 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
362 ia_na_entries /= sizeof(*e);
364 struct dhcpv6_ia_hdr hdr_ia_na = {
365 htons(DHCPV6_OPT_IA_NA),
366 htons(sizeof(hdr_ia_na) - 4),
370 struct dhcpv6_ia_addr pa[ia_na_entries];
371 for (size_t i = 0; i < ia_na_entries; ++i) {
372 pa[i].type = htons(DHCPV6_OPT_IA_ADDR);
373 pa[i].len = htons(sizeof(pa[i]) - 4U);
374 pa[i].addr = e[i].target;
380 ia_na_len = sizeof(pa);
381 hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
383 // Reconfigure Accept
387 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
389 // Request Information Refresh
390 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
392 // Build vendor-class option
393 size_t vendor_class_len, user_class_len;
394 struct dhcpv6_vendorclass *vendor_class = odhcp6c_get_state(STATE_VENDORCLASS, &vendor_class_len);
395 void *user_class = odhcp6c_get_state(STATE_USERCLASS, &user_class_len);
400 } vendor_class_hdr = {htons(DHCPV6_OPT_VENDOR_CLASS), htons(vendor_class_len)};
405 } user_class_hdr = {htons(DHCPV6_OPT_USER_CLASS), htons(user_class_len)};
409 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
413 uint16_t elapsed_type;
414 uint16_t elapsed_len;
415 uint16_t elapsed_value;
419 type, {trid[0], trid[1], trid[2]},
420 htons(DHCPV6_OPT_ELAPSED), htons(2),
421 htons((ecs > 0xffff) ? 0xffff : ecs),
422 htons(DHCPV6_OPT_ORO), htons(oro_len),
425 struct iovec iov[IOV_TOTAL] = {
426 [IOV_HDR] = {&hdr, sizeof(hdr)},
427 [IOV_ORO] = {oro, oro_len},
428 [IOV_ORO_REFRESH] = {&oro_refresh, 0},
429 [IOV_CL_ID] = {cl_id, cl_id_len},
430 [IOV_SRV_ID] = {srv_id, srv_id_len},
431 [IOV_VENDOR_CLASS_HDR] = {&vendor_class_hdr, vendor_class_len ? sizeof(vendor_class_hdr) : 0},
432 [IOV_VENDOR_CLASS] = {vendor_class, vendor_class_len},
433 [IOV_USER_CLASS_HDR] = {&user_class_hdr, user_class_len ? sizeof(user_class_hdr) : 0},
434 [IOV_USER_CLASS] = {user_class, user_class_len},
435 [IOV_RECONF_ACCEPT] = {&reconf_accept, sizeof(reconf_accept)},
436 [IOV_FQDN] = {&fqdn, fqdn_len},
437 [IOV_HDR_IA_NA] = {&hdr_ia_na, sizeof(hdr_ia_na)},
438 [IOV_IA_NA] = {ia_na, ia_na_len},
439 [IOV_IA_PD] = {ia_pd, ia_pd_len},
442 size_t cnt = IOV_TOTAL;
443 if (type == DHCPV6_MSG_INFO_REQ) {
445 iov[IOV_ORO_REFRESH].iov_len = sizeof(oro_refresh);
446 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
447 } else if (!request_prefix) {
451 // Disable IAs if not used
452 if (type != DHCPV6_MSG_SOLICIT && ia_na_len == 0)
453 iov[IOV_HDR_IA_NA].iov_len = 0;
455 if (na_mode == IA_MODE_NONE)
456 iov[IOV_HDR_IA_NA].iov_len = 0;
458 if ((type != DHCPV6_MSG_SOLICIT && type != DHCPV6_MSG_REQUEST) ||
459 !(client_options & DHCPV6_ACCEPT_RECONFIGURE))
460 iov[IOV_RECONF_ACCEPT].iov_len = 0;
462 if (!(client_options & DHCPV6_CLIENT_FQDN))
463 iov[IOV_FQDN].iov_len = 0;
465 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
466 0, ALL_DHCPV6_RELAYS, ifindex};
467 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
469 sendmsg(sock, &msg, 0);
473 static int64_t dhcpv6_rand_delay(int64_t time)
476 odhcp6c_random(&random, sizeof(random));
477 return (time * ((int64_t)random % 1000LL)) / 10000LL;
481 int dhcpv6_request(enum dhcpv6_msg type)
484 uint64_t timeout = UINT32_MAX;
485 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
488 struct timespec ts = {0, 0};
489 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
490 nanosleep(&ts, NULL);
493 if (type == DHCPV6_MSG_UNKNOWN)
495 else if (type == DHCPV6_MSG_RENEW)
496 timeout = (t2 > t1) ? t2 - t1 : ((t1 == UINT32_MAX) ? UINT32_MAX : 0);
497 else if (type == DHCPV6_MSG_REBIND)
498 timeout = (t3 > t2) ? t3 - t2 : ((t2 == UINT32_MAX) ? UINT32_MAX : 0);
503 syslog(LOG_NOTICE, "Starting %s transaction (timeout %llus, max rc %d)",
504 retx->name, (unsigned long long)timeout, retx->max_rc);
506 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
508 // Generate transaction ID
509 uint8_t trid[3] = {0, 0, 0};
510 if (type != DHCPV6_MSG_UNKNOWN)
511 odhcp6c_random(trid, sizeof(trid));
517 int64_t delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
519 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
520 while (type == DHCPV6_MSG_SOLICIT && delay <= 0)
521 delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
523 rto = (retx->init_timeo * 1000 + delay);
526 rto = (2 * rto + dhcpv6_rand_delay(rto));
528 if (retx->max_timeo && (rto >= retx->max_timeo * 1000))
529 rto = retx->max_timeo * 1000 +
530 dhcpv6_rand_delay(retx->max_timeo * 1000);
532 // Calculate end for this round and elapsed time
533 uint64_t round_end = round_start + rto;
534 elapsed = round_start - start;
536 // Don't wait too long if timeout differs from infinite
537 if ((timeout != UINT32_MAX) && (round_end - start > timeout * 1000))
538 round_end = timeout * 1000 + start;
540 // Built and send package
541 if (type != DHCPV6_MSG_UNKNOWN) {
542 if (type != DHCPV6_MSG_SOLICIT)
543 syslog(LOG_NOTICE, "Send %s message (elapsed %llums, rc %d)",
544 retx->name, (unsigned long long)elapsed, rc);
545 dhcpv6_send(type, trid, elapsed / 10);
550 for (; len < 0 && (round_start < round_end);
551 round_start = odhcp6c_get_milli_time()) {
552 uint8_t buf[1536], cmsg_buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
553 struct iovec iov = {buf, sizeof(buf)};
554 struct sockaddr_in6 addr;
555 struct msghdr msg = {&addr, sizeof(addr), &iov, 1,
556 cmsg_buf, sizeof(cmsg_buf), 0};
557 struct in6_pktinfo *pktinfo = NULL;
560 // Check for pending signal
561 if (odhcp6c_signal_process())
564 // Set timeout for receiving
565 uint64_t t = round_end - round_start;
566 struct timeval tv = {t / 1000, (t % 1000) * 1000};
567 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
571 len = recvmsg(sock, &msg, 0);
575 for (struct cmsghdr *ch = CMSG_FIRSTHDR(&msg); ch != NULL;
576 ch = CMSG_NXTHDR(&msg, ch)) {
577 if (ch->cmsg_level == SOL_IPV6 &&
578 ch->cmsg_type == IPV6_PKTINFO) {
579 pktinfo = (struct in6_pktinfo *)CMSG_DATA(ch);
584 if (pktinfo == NULL) {
589 if (!dhcpv6_response_is_valid(buf, len, trid,
590 type, &pktinfo->ipi6_addr)) {
595 uint8_t *opt = &buf[4];
596 uint8_t *opt_end = opt + len - 4;
598 round_start = odhcp6c_get_milli_time();
599 elapsed = round_start - start;
600 syslog(LOG_NOTICE, "Got a valid reply after "
601 "%llums", (unsigned long long)elapsed);
603 if (retx->handler_reply)
604 len = retx->handler_reply(type, rc, opt, opt_end, &addr);
606 if (len > 0 && round_end - round_start > 1000)
607 round_end = 1000 + round_start;
611 if (retx->handler_finish)
612 len = retx->handler_finish();
613 } while (len < 0 && ((timeout == UINT32_MAX) || (elapsed / 1000 < timeout)) &&
614 (!retx->max_rc || rc < retx->max_rc));
618 // Message validation checks according to RFC3315 chapter 15
619 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
620 const uint8_t transaction[3], enum dhcpv6_msg type,
621 const struct in6_addr *daddr)
623 const struct dhcpv6_header *rep = buf;
624 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
625 transaction, sizeof(rep->tr_id)))
626 return false; // Invalid reply
628 if (type == DHCPV6_MSG_SOLICIT) {
629 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
630 rep->msg_type != DHCPV6_MSG_REPLY)
632 } else if (type == DHCPV6_MSG_UNKNOWN) {
633 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
635 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
639 uint8_t *end = ((uint8_t*)buf) + len, *odata = NULL,
640 rcmsg = DHCPV6_MSG_UNKNOWN;
641 uint16_t otype, olen = UINT16_MAX;
642 bool clientid_ok = false, serverid_ok = false, rcauth_ok = false,
643 ia_present = false, options_valid = true;
645 size_t client_id_len, server_id_len;
646 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
647 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
649 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata) {
650 if (otype == DHCPV6_OPT_CLIENTID) {
651 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
652 &odata[-4], client_id, client_id_len);
653 } else if (otype == DHCPV6_OPT_SERVERID) {
655 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
656 &odata[-4], server_id, server_id_len);
659 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
660 sizeof(struct dhcpv6_auth_reconfigure)) {
661 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
662 if (r->protocol != 3 || r->algorithm != 1 || r->reconf_type != 2)
666 uint8_t serverhash[16], secretbytes[64], hash[16];
667 memcpy(serverhash, r->key, sizeof(serverhash));
668 memset(r->key, 0, sizeof(r->key));
670 memset(secretbytes, 0, sizeof(secretbytes));
671 memcpy(secretbytes, reconf_key, sizeof(reconf_key));
673 for (size_t i = 0; i < sizeof(secretbytes); ++i)
674 secretbytes[i] ^= 0x36;
677 md5_hash(secretbytes, sizeof(secretbytes), &md5);
678 md5_hash(buf, len, &md5);
681 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
682 secretbytes[i] ^= 0x36;
683 secretbytes[i] ^= 0x5c;
687 md5_hash(secretbytes, sizeof(secretbytes), &md5);
688 md5_hash(hash, 16, &md5);
691 rcauth_ok = !memcmp(hash, serverhash, sizeof(hash));
692 } else if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1) {
694 } else if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)) {
696 if (olen < -4 + sizeof(struct dhcpv6_ia_hdr))
697 options_valid = false;
699 else if ((otype == DHCPV6_OPT_IA_ADDR) || (otype == DHCPV6_OPT_IA_PREFIX) ||
700 (otype == DHCPV6_OPT_PD_EXCLUDE)) {
701 // Options are not allowed on global level
702 options_valid = false;
706 if (!options_valid || ((odata + olen) > end))
709 if (type == DHCPV6_MSG_INFO_REQ && ia_present)
712 if (rep->msg_type == DHCPV6_MSG_RECONF) {
713 if ((rcmsg != DHCPV6_MSG_RENEW && rcmsg != DHCPV6_MSG_INFO_REQ) ||
714 (rcmsg == DHCPV6_MSG_INFO_REQ && ia_present) ||
715 !rcauth_ok || IN6_IS_ADDR_MULTICAST(daddr))
719 return clientid_ok && serverid_ok;
723 int dhcpv6_poll_reconfigure(void)
725 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
727 ret = dhcpv6_request(ret);
733 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig, const int rc,
734 const void *opt, const void *end, _unused const struct sockaddr_in6 *from)
736 uint16_t otype, olen;
737 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
738 dhcpv6_for_each_option(opt, end, otype, olen, odata)
739 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
740 odata[0] == DHCPV6_MSG_RENEW ||
741 odata[0] == DHCPV6_MSG_INFO_REQ))
744 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, rc, NULL, NULL, NULL);
749 // Collect all advertised servers
750 static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
751 const void *opt, const void *end, _unused const struct sockaddr_in6 *from)
753 uint16_t olen, otype;
754 uint8_t *odata, pref = 0;
755 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0},
757 DHCPV6_INF_MAX_RT, NULL, NULL, 0, 0};
758 bool have_na = false;
761 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
762 if (orig == DHCPV6_MSG_SOLICIT &&
763 (otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA) &&
764 olen > -4 + sizeof(struct dhcpv6_ia_hdr)) {
765 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
766 dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
769 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
770 memcpy(cand.duid, odata, olen);
771 cand.duid_len = olen;
772 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
773 int error = ((int)odata[0] << 8 | (int)odata[1]);
776 case DHCPV6_NoPrefixAvail:
777 // Status code on global level
778 cand.preference -= 2000;
784 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
785 cand.preference >= 0) {
786 cand.preference = pref = odata[0];
787 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
788 cand.wants_reconfigure = true;
789 } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
790 uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
791 if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
792 sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
793 cand.sol_max_rt = sol_max_rt;
794 } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
795 uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
796 if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
797 inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
798 cand.inf_max_rt = inf_max_rt;
799 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
800 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
801 uint8_t *oend = odata + olen, *d;
802 dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
803 if (otype == DHCPV6_OPT_IA_PREFIX &&
804 olen >= -4 + sizeof(struct dhcpv6_ia_prefix)) {
805 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&d[-4];
809 } else if (otype == DHCPV6_OPT_IA_NA) {
810 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
811 uint8_t *oend = odata + olen, *d;
812 dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
813 if (otype == DHCPV6_OPT_IA_ADDR &&
814 olen >= -4 + sizeof(struct dhcpv6_ia_addr))
819 if ((!have_na && na_mode == IA_MODE_FORCE) ||
820 (!have_pd && pd_mode == IA_MODE_FORCE)) {
822 * RFC7083 states to process the SOL_MAX_RT and
823 * INF_MAX_RT options even if the DHCPv6 server
824 * did not propose any IA_NA and/or IA_PD
826 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand.sol_max_rt;
827 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand.inf_max_rt;
831 if (na_mode != IA_MODE_NONE && !have_na) {
832 cand.has_noaddravail = true;
833 cand.preference -= 1000;
836 if (pd_mode != IA_MODE_NONE) {
838 cand.preference += 2000 + (128 - have_pd);
840 cand.preference -= 2000;
843 if (cand.duid_len > 0) {
844 cand.ia_na = odhcp6c_move_state(STATE_IA_NA, &cand.ia_na_len);
845 cand.ia_pd = odhcp6c_move_state(STATE_IA_PD, &cand.ia_pd_len);
846 dhcpv6_add_server_cand(&cand);
849 return (rc > 1 || (pref == 255 && cand.preference > 0)) ? 1 : -1;
853 static int dhcpv6_commit_advert(void)
855 return dhcpv6_promote_server_cand();
859 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig, const int rc,
860 const void *opt, const void *end, const struct sockaddr_in6 *from)
862 dhcpv6_handle_advert(orig, rc, opt, end, from);
863 if (dhcpv6_commit_advert() < 0)
866 return dhcpv6_handle_reply(orig, rc, opt, end, from);
870 static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc,
871 const void *opt, const void *end, const struct sockaddr_in6 *from)
874 uint16_t otype, olen;
875 uint32_t refresh = UINT32_MAX;
877 bool handled_status_codes[_DHCPV6_Status_Max] = { false, };
881 if (orig == DHCPV6_MSG_UNKNOWN) {
882 static time_t last_update = 0;
883 time_t now = odhcp6c_get_milli_time() / 1000;
885 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
888 if (t1 != UINT32_MAX)
891 if (t2 != UINT32_MAX)
894 if (t3 != UINT32_MAX)
907 if (orig == DHCPV6_MSG_REQUEST && !odhcp6c_is_bound()) {
908 // Delete NA and PD we have in the state from the Advert
909 odhcp6c_clear_state(STATE_IA_NA);
910 odhcp6c_clear_state(STATE_IA_PD);
914 odhcp6c_clear_state(STATE_DNS);
915 odhcp6c_clear_state(STATE_SEARCH);
916 odhcp6c_clear_state(STATE_SNTP_IP);
917 odhcp6c_clear_state(STATE_NTP_IP);
918 odhcp6c_clear_state(STATE_NTP_FQDN);
919 odhcp6c_clear_state(STATE_SIP_IP);
920 odhcp6c_clear_state(STATE_SIP_FQDN);
921 odhcp6c_clear_state(STATE_AFTR_NAME);
922 odhcp6c_clear_state(STATE_CER);
923 odhcp6c_clear_state(STATE_S46_MAPT);
924 odhcp6c_clear_state(STATE_S46_MAPE);
925 odhcp6c_clear_state(STATE_S46_LW);
926 odhcp6c_clear_state(STATE_PASSTHRU);
929 // Parse and find all matching IAs
930 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
931 bool passthru = true;
933 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
934 && olen > -4 + sizeof(struct dhcpv6_ia_hdr)) {
935 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
938 if (ia_hdr->iaid != htonl(1) && otype == DHCPV6_OPT_IA_NA)
941 uint16_t code = DHCPV6_Success;
942 uint16_t stype, slen;
944 // Get and handle status code
945 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
946 stype, slen, sdata) {
947 if (stype == DHCPV6_OPT_STATUS && slen >= 2) {
948 uint8_t *mdata = (slen > 2) ? &sdata[2] : NULL;
949 uint16_t mlen = (slen > 2) ? slen - 2 : 0;
951 code = ((int)sdata[0]) << 8 | ((int)sdata[1]);
953 if (code == DHCPV6_Success)
956 dhcpv6_handle_ia_status_code(orig, ia_hdr,
957 code, mdata, mlen, handled_status_codes, &ret);
966 if (code != DHCPV6_Success)
969 dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
971 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
972 uint8_t *mdata = (olen > 2) ? &odata[2] : NULL;
973 uint16_t mlen = (olen > 2) ? olen - 2 : 0;
974 uint16_t code = ((int)odata[0]) << 8 | ((int)odata[1]);
976 dhcpv6_handle_status_code(orig, code, mdata, mlen, &ret);
979 else if (otype == DHCPV6_OPT_DNS_SERVERS) {
981 odhcp6c_add_state(STATE_DNS, odata, olen);
982 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
983 odhcp6c_add_state(STATE_SEARCH, odata, olen);
985 } else if (otype == DHCPV6_OPT_SNTP_SERVERS) {
987 odhcp6c_add_state(STATE_SNTP_IP, odata, olen);
988 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
989 uint16_t stype, slen;
991 // Test status and bail if error
992 dhcpv6_for_each_option(odata, odata + olen,
993 stype, slen, sdata) {
994 if (slen == 16 && (stype == NTP_MC_ADDR ||
995 stype == NTP_SRV_ADDR))
996 odhcp6c_add_state(STATE_NTP_IP,
998 else if (slen > 0 && stype == NTP_SRV_FQDN)
999 odhcp6c_add_state(STATE_NTP_FQDN,
1002 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
1004 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
1005 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
1006 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
1007 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
1008 refresh = ntohl(*((uint32_t*)odata));
1010 } else if (otype == DHCPV6_OPT_AUTH) {
1011 if (olen == -4 + sizeof(struct dhcpv6_auth_reconfigure)) {
1012 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
1013 if (r->protocol == 3 && r->algorithm == 1 &&
1014 r->reconf_type == 1)
1015 memcpy(reconf_key, r->key, sizeof(r->key));
1018 } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) {
1020 odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
1022 odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
1024 } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
1025 uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
1026 if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
1027 sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
1028 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_max_rt;
1030 } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
1031 uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
1032 if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
1033 inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
1034 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = inf_max_rt;
1037 } else if (otype == DHCPV6_OPT_CER_ID && olen == -4 +
1038 sizeof(struct dhcpv6_cer_id)) {
1039 struct dhcpv6_cer_id *cer_id = (void*)&odata[-4];
1040 struct in6_addr any = IN6ADDR_ANY_INIT;
1041 if (memcmp(&cer_id->addr, &any, sizeof(any)))
1042 odhcp6c_add_state(STATE_CER, &cer_id->addr, sizeof(any));
1045 } else if (otype == DHCPV6_OPT_S46_CONT_MAPT) {
1046 odhcp6c_add_state(STATE_S46_MAPT, odata, olen);
1048 } else if (otype == DHCPV6_OPT_S46_CONT_MAPE) {
1050 odhcp6c_get_state(STATE_S46_MAPE, &mape_len);
1052 odhcp6c_add_state(STATE_S46_MAPE, odata, olen);
1054 } else if (otype == DHCPV6_OPT_S46_CONT_LW) {
1055 odhcp6c_add_state(STATE_S46_LW, odata, olen);
1057 } else if (otype == DHCPV6_OPT_CLIENTID ||
1058 otype == DHCPV6_OPT_SERVERID ||
1059 otype == DHCPV6_OPT_IA_TA ||
1060 otype == DHCPV6_OPT_PREF ||
1061 otype == DHCPV6_OPT_UNICAST ||
1062 otype == DHCPV6_OPT_FQDN ||
1063 otype == DHCPV6_OPT_RECONF_ACCEPT) {
1066 odhcp6c_add_state(STATE_CUSTOM_OPTS, &odata[-4], olen + 4);
1070 odhcp6c_add_state(STATE_PASSTHRU, &odata[-4], olen + 4);
1073 if (orig != DHCPV6_MSG_INFO_REQ) {
1074 // Update refresh timers if no fatal status code was received
1075 if ((ret > 0) && dhcpv6_calc_refresh_timers()) {
1077 case DHCPV6_MSG_RENEW:
1078 // Send further renews if T1 is not set
1082 case DHCPV6_MSG_REBIND:
1083 // Send further rebinds if T1 and T2 is not set
1088 case DHCPV6_MSG_REQUEST:
1089 // All server candidates can be cleared if not yet bound
1090 if (!odhcp6c_is_bound())
1091 dhcpv6_clear_all_server_cand();
1097 if (orig == DHCPV6_MSG_REBIND || orig == DHCPV6_MSG_REQUEST) {
1098 odhcp6c_clear_state(STATE_SERVER_ADDR);
1099 odhcp6c_add_state(STATE_SERVER_ADDR, &from->sin6_addr, 16);
1104 // All server candidates can be cleared if not yet bound
1105 if (!odhcp6c_is_bound())
1106 dhcpv6_clear_all_server_cand();
1115 static int dhcpv6_parse_ia(void *opt, void *end)
1117 struct dhcpv6_ia_hdr *ia_hdr = (struct dhcpv6_ia_hdr *)opt;
1120 uint16_t otype, olen;
1123 t1 = ntohl(ia_hdr->t1);
1124 t2 = ntohl(ia_hdr->t2);
1129 // Update address IA
1130 dhcpv6_for_each_option(&ia_hdr[1], end, otype, olen, odata) {
1131 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
1132 IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0, 0};
1134 entry.iaid = ia_hdr->iaid;
1136 if (otype == DHCPV6_OPT_IA_PREFIX) {
1137 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
1138 if (olen + 4U < sizeof(*prefix))
1141 entry.valid = ntohl(prefix->valid);
1142 entry.preferred = ntohl(prefix->preferred);
1144 if (entry.preferred > entry.valid)
1147 entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1148 entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1149 if (entry.t1 > entry.t2)
1150 entry.t1 = entry.t2;
1152 entry.length = prefix->prefix;
1153 entry.target = prefix->addr;
1154 uint16_t stype, slen;
1157 #ifdef EXT_PREFIX_CLASS
1158 // Find prefix class, if any
1159 dhcpv6_for_each_option(&prefix[1], odata + olen,
1161 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
1162 entry.class = sdata[0] << 8 | sdata[1];
1167 dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
1168 odata + olen, stype, slen, sdata) {
1169 if (stype != DHCPV6_OPT_PD_EXCLUDE || slen < 2)
1172 uint8_t elen = sdata[0];
1176 if (elen <= 32 || elen <= entry.length) {
1182 uint8_t bytes = ((elen - entry.length - 1) / 8) + 1;
1183 if (slen <= bytes) {
1188 uint32_t exclude = 0;
1190 exclude = exclude << 8 | sdata[bytes];
1193 exclude >>= 8 - ((elen - entry.length) % 8);
1194 exclude <<= 64 - elen;
1196 // Abusing router & priority fields for exclusion
1197 entry.router = entry.target;
1198 entry.router.s6_addr32[1] |= htonl(exclude);
1199 entry.priority = elen;
1203 odhcp6c_update_entry(STATE_IA_PD, &entry);
1208 memset(&entry.router, 0, sizeof(entry.router));
1209 } else if (otype == DHCPV6_OPT_IA_ADDR) {
1210 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
1211 if (olen + 4U < sizeof(*addr))
1214 entry.preferred = ntohl(addr->preferred);
1215 entry.valid = ntohl(addr->valid);
1217 if (entry.preferred > entry.valid)
1220 entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1221 entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1222 if (entry.t1 > entry.t2)
1223 entry.t1 = entry.t2;
1226 entry.target = addr->addr;
1228 #ifdef EXT_PREFIX_CLASS
1229 uint16_t stype, slen;
1231 // Find prefix class, if any
1232 dhcpv6_for_each_option(&addr[1], odata + olen,
1234 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
1235 entry.class = sdata[0] << 8 | sdata[1];
1238 odhcp6c_update_entry(STATE_IA_NA, &entry);
1246 static int dhcpv6_calc_refresh_timers(void)
1248 struct odhcp6c_entry *e;
1249 size_t ia_na_entries, ia_pd_entries, i;
1250 int64_t l_t1 = UINT32_MAX, l_t2 = UINT32_MAX, l_t3 = 0;
1252 e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
1253 ia_na_entries /= sizeof(*e);
1254 for (i = 0; i < ia_na_entries; i++) {
1261 if (e[i].valid > l_t3)
1265 e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
1266 ia_pd_entries /= sizeof(*e);
1267 for (i = 0; i < ia_pd_entries; i++) {
1274 if (e[i].valid > l_t3)
1278 if (ia_pd_entries || ia_na_entries) {
1286 return (int)(ia_pd_entries + ia_na_entries);
1290 static void dhcpv6_log_status_code(const uint16_t code, const char *scope,
1291 const void *status_msg, const int len)
1293 uint8_t buf[len + 3];
1295 memset(buf, 0, sizeof(buf));
1298 memcpy(&buf[1], status_msg, len);
1302 syslog(LOG_WARNING, "Server returned %s status %i %s",
1307 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig,
1308 const uint16_t code, const void *status_msg, const int len,
1311 dhcpv6_log_status_code(code, "message", status_msg, len);
1314 case DHCPV6_UnspecFail:
1319 case DHCPV6_UseMulticast:
1320 // TODO handle multicast status code
1323 case DHCPV6_NoAddrsAvail:
1324 case DHCPV6_NoPrefixAvail:
1325 if (orig == DHCPV6_MSG_REQUEST)
1326 *ret = 0; // Failure
1335 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig,
1336 const struct dhcpv6_ia_hdr *ia_hdr, const uint16_t code,
1337 const void *status_msg, const int len,
1338 bool handled_status_codes[_DHCPV6_Status_Max], int *ret)
1340 dhcpv6_log_status_code(code, ia_hdr->type == DHCPV6_OPT_IA_NA ?
1341 "IA_NA" : "IA_PD", status_msg, len);
1344 case DHCPV6_NoBinding:
1346 case DHCPV6_MSG_RENEW:
1347 case DHCPV6_MSG_REBIND:
1348 if ((*ret > 0) && !handled_status_codes[code])
1349 *ret = dhcpv6_request(DHCPV6_MSG_REQUEST);
1357 case DHCPV6_NoAddrsAvail:
1358 case DHCPV6_NoPrefixAvail:
1360 case DHCPV6_MSG_REQUEST:
1369 case DHCPV6_NotOnLink:
1370 // TODO handle not onlink in case of confirm
1378 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand *cand)
1381 struct dhcpv6_server_cand *c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1383 // Remove identical duid server candidate
1384 for (i = 0; i < cand_len / sizeof(*c); ++i) {
1385 if (cand->duid_len == c[i].duid_len &&
1386 !memcmp(cand->duid, c[i].duid, cand->duid_len)) {
1389 odhcp6c_remove_state(STATE_SERVER_CAND, i * sizeof(*c), sizeof(*c));
1394 for (i = 0, c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1395 i < cand_len / sizeof(*c); ++i) {
1396 if (c[i].preference < cand->preference)
1400 odhcp6c_insert_state(STATE_SERVER_CAND, i * sizeof(*c), cand, sizeof(*cand));
1403 static void dhcpv6_clear_all_server_cand(void)
1406 struct dhcpv6_server_cand *c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1408 // Server candidates need deep delete for IA_NA/IA_PD
1409 for (i = 0; i < cand_len / sizeof(*c); ++i) {
1413 odhcp6c_clear_state(STATE_SERVER_CAND);
1416 int dhcpv6_promote_server_cand(void)
1419 struct dhcpv6_server_cand *cand = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1421 int ret = DHCPV6_STATELESS;
1423 // Clear lingering candidate state info
1424 odhcp6c_clear_state(STATE_SERVER_ID);
1425 odhcp6c_clear_state(STATE_IA_NA);
1426 odhcp6c_clear_state(STATE_IA_PD);
1431 if (cand->has_noaddravail && na_mode == IA_MODE_TRY) {
1432 na_mode = IA_MODE_NONE;
1434 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
1435 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
1437 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
1440 hdr[0] = htons(DHCPV6_OPT_SERVERID);
1441 hdr[1] = htons(cand->duid_len);
1442 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
1443 odhcp6c_add_state(STATE_SERVER_ID, cand->duid, cand->duid_len);
1444 accept_reconfig = cand->wants_reconfigure;
1445 if (cand->ia_na_len) {
1446 odhcp6c_add_state(STATE_IA_NA, cand->ia_na, cand->ia_na_len);
1448 if (na_mode != IA_MODE_NONE)
1449 ret = DHCPV6_STATEFUL;
1451 if (cand->ia_pd_len) {
1452 odhcp6c_add_state(STATE_IA_PD, cand->ia_pd, cand->ia_pd_len);
1455 ret = DHCPV6_STATEFUL;
1458 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
1459 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
1461 odhcp6c_remove_state(STATE_SERVER_CAND, 0, sizeof(*cand));