2 * Copyright (C) 2012-2013 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
46 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
47 const uint8_t transaction[3], enum dhcpv6_msg type);
49 static uint32_t dhcpv6_parse_ia(void *opt, void *end);
51 static reply_handler dhcpv6_handle_reply;
52 static reply_handler dhcpv6_handle_advert;
53 static reply_handler dhcpv6_handle_rebind_reply;
54 static reply_handler dhcpv6_handle_reconfigure;
55 static int dhcpv6_commit_advert(void);
59 // RFC 3315 - 5.5 Timeout and Delay values
60 static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
61 [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, "<POLL>",
62 dhcpv6_handle_reconfigure, NULL},
63 [DHCPV6_MSG_SOLICIT] = {true, 1, 120, "SOLICIT",
64 dhcpv6_handle_advert, dhcpv6_commit_advert},
65 [DHCPV6_MSG_REQUEST] = {true, 1, 30, "REQUEST",
66 dhcpv6_handle_reply, NULL},
67 [DHCPV6_MSG_RENEW] = {false, 10, 600, "RENEW",
68 dhcpv6_handle_reply, NULL},
69 [DHCPV6_MSG_REBIND] = {false, 10, 600, "REBIND",
70 dhcpv6_handle_rebind_reply, NULL},
71 [DHCPV6_MSG_RELEASE] = {false, 1, 600, "RELEASE", NULL, NULL},
72 [DHCPV6_MSG_DECLINE] = {false, 1, 3, "DECLINE", NULL, NULL},
73 [DHCPV6_MSG_INFO_REQ] = {true, 1, 120, "INFOREQ",
74 dhcpv6_handle_reply, NULL},
80 static int ifindex = -1;
81 static int64_t t1 = 0, t2 = 0, t3 = 0;
84 static int request_prefix = -1;
85 static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE, pd_mode = IA_MODE_NONE;
86 static bool accept_reconfig = false;
89 static uint8_t reconf_key[16];
93 int init_dhcpv6(const char *ifname, int request_pd, int sol_timeout)
95 request_prefix = request_pd;
96 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_timeout;
98 sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
102 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
103 if (ioctl(sock, SIOCGIFINDEX, &ifr))
105 ifindex = ifr.ifr_ifindex;
107 // Create client DUID
108 size_t client_id_len;
109 odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
110 if (client_id_len == 0) {
111 ioctl(sock, SIOCGIFHWADDR, &ifr);
112 uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
113 DHCPV6_DUID_LLADDR, 0, 1};
114 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
116 uint8_t zero[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
117 struct ifreq ifs[100], *ifp, *ifend;
120 ifc.ifc_len = sizeof(ifs);
122 if (!memcmp(&duid[8], zero, ETHER_ADDR_LEN) &&
123 ioctl(sock, SIOCGIFCONF, &ifc) >= 0) {
124 // If our interface doesn't have an address...
125 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
126 for (ifp = ifc.ifc_req; ifp < ifend &&
127 !memcmp(&duid[8], zero, 6); ifp++) {
128 memcpy(ifr.ifr_name, ifp->ifr_name,
129 sizeof(ifr.ifr_name));
130 ioctl(sock, SIOCGIFHWADDR, &ifr);
131 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data,
136 odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
141 htons(DHCPV6_OPT_SIP_SERVER_D),
142 htons(DHCPV6_OPT_SIP_SERVER_A),
143 htons(DHCPV6_OPT_DNS_SERVERS),
144 htons(DHCPV6_OPT_DNS_DOMAIN),
145 htons(DHCPV6_OPT_NTP_SERVER),
146 htons(DHCPV6_OPT_SIP_SERVER_A),
147 htons(DHCPV6_OPT_AFTR_NAME),
148 htons(DHCPV6_OPT_PD_EXCLUDE),
149 #ifdef EXT_PREFIX_CLASS
150 htons(DHCPV6_OPT_PREFIX_CLASS),
153 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
156 // Configure IPv6-options
158 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
159 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
160 setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
162 struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
163 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
164 if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)))
171 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd)
178 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
182 gethostname(fqdn_buf, sizeof(fqdn_buf));
189 size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
190 sizeof(fqdn.data), NULL, NULL);
191 fqdn.type = htons(DHCPV6_OPT_FQDN);
192 fqdn.len = htons(fqdn_len - 4);
198 void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
202 void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
205 size_t ia_pd_entries, ia_pd_len = 0;
206 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
207 ia_pd_entries /= sizeof(*e);
208 struct dhcpv6_ia_hdr hdr_ia_pd = {
209 htons(DHCPV6_OPT_IA_PD),
210 htons(sizeof(hdr_ia_pd) - 4),
215 uint8_t *ia_pd = alloca(ia_pd_entries * (sizeof(struct dhcpv6_ia_prefix) + 10));
216 for (size_t i = 0; i < ia_pd_entries; ++i) {
218 if (e[i].priority > 0)
219 ex_len = ((e[i].priority - e[i].length - 1) / 8) + 6;
221 struct dhcpv6_ia_prefix p = {
222 .type = htons(DHCPV6_OPT_IA_PREFIX),
223 .len = htons(sizeof(p) - 4U + ex_len),
224 .prefix = e[i].length,
228 memcpy(ia_pd + ia_pd_len, &p, sizeof(p));
229 ia_pd_len += sizeof(p);
232 ia_pd[ia_pd_len++] = 0;
233 ia_pd[ia_pd_len++] = DHCPV6_OPT_PD_EXCLUDE;
234 ia_pd[ia_pd_len++] = 0;
235 ia_pd[ia_pd_len++] = ex_len - 4;
236 ia_pd[ia_pd_len++] = e[i].priority;
238 uint32_t excl = ntohl(e[i].router.s6_addr32[1]);
239 excl >>= (64 - e[i].priority);
240 excl <<= 8 - ((e[i].priority - e[i].length) % 8);
242 for (size_t i = ex_len - 5; i > 0; --i, excl >>= 8)
243 ia_pd[ia_pd_len + i] = excl & 0xff;
244 ia_pd_len += ex_len - 5;
248 struct dhcpv6_ia_prefix pref = {
249 .type = htons(DHCPV6_OPT_IA_PREFIX),
250 .len = htons(25), .prefix = request_prefix
252 if (request_prefix > 0 && ia_pd_len == 0 && type == DHCPV6_MSG_SOLICIT) {
253 ia_pd = (uint8_t*)&pref;
254 ia_pd_len = sizeof(pref);
256 hdr_ia_pd.len = htons(ntohs(hdr_ia_pd.len) + ia_pd_len);
259 size_t ia_na_entries, ia_na_len = 0;
261 e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
262 ia_na_entries /= sizeof(*e);
264 struct dhcpv6_ia_hdr hdr_ia_na = {
265 htons(DHCPV6_OPT_IA_NA),
266 htons(sizeof(hdr_ia_na) - 4),
270 struct dhcpv6_ia_addr pa[ia_na_entries];
271 for (size_t i = 0; i < ia_na_entries; ++i) {
272 pa[i].type = htons(DHCPV6_OPT_IA_ADDR);
273 pa[i].len = htons(sizeof(pa[i]) - 4U);
274 pa[i].addr = e[i].target;
280 ia_na_len = sizeof(pa);
281 hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
283 // Reconfigure Accept
287 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
289 // Request Information Refresh
290 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
294 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
298 uint16_t elapsed_type;
299 uint16_t elapsed_len;
300 uint16_t elapsed_value;
304 type, {trid[0], trid[1], trid[2]},
305 htons(DHCPV6_OPT_ELAPSED), htons(2),
306 htons((ecs > 0xffff) ? 0xffff : ecs),
307 htons(DHCPV6_OPT_ORO), htons(oro_len),
310 struct iovec iov[] = {
315 {srv_id, srv_id_len},
316 {&reconf_accept, sizeof(reconf_accept)},
318 {&hdr_ia_na, sizeof(hdr_ia_na)},
320 {&hdr_ia_pd, sizeof(hdr_ia_pd)},
324 size_t cnt = ARRAY_SIZE(iov);
325 if (type == DHCPV6_MSG_INFO_REQ) {
327 iov[2].iov_len = sizeof(oro_refresh);
328 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
329 } else if (!request_prefix) {
333 // Disable IAs if not used
334 if (type != DHCPV6_MSG_SOLICIT) {
342 if (na_mode == IA_MODE_NONE)
345 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
346 0, ALL_DHCPV6_RELAYS, ifindex};
347 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
349 sendmsg(sock, &msg, 0);
353 static int64_t dhcpv6_rand_delay(int64_t time)
356 odhcp6c_random(&random, sizeof(random));
357 return (time * ((int64_t)random % 1000LL)) / 10000LL;
361 int dhcpv6_request(enum dhcpv6_msg type)
364 uint64_t timeout = UINT32_MAX;
365 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
368 struct timespec ts = {0, 0};
369 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
370 nanosleep(&ts, NULL);
373 if (type == DHCPV6_MSG_REQUEST)
375 else if (type == DHCPV6_MSG_RELEASE || type == DHCPV6_MSG_DECLINE)
377 else if (type == DHCPV6_MSG_UNKNOWN)
379 else if (type == DHCPV6_MSG_RENEW)
380 timeout = (t2 > t1) ? t2 - t1 : 0;
381 else if (type == DHCPV6_MSG_REBIND)
382 timeout = (t3 > t2) ? t3 - t2 : 0;
387 syslog(LOG_NOTICE, "Sending %s (timeout %us)", retx->name, (unsigned)timeout);
389 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
391 // Generate transaction ID
392 uint8_t trid[3] = {0, 0, 0};
393 if (type != DHCPV6_MSG_UNKNOWN)
394 odhcp6c_random(trid, sizeof(trid));
399 rto = (rto == 0) ? (retx->init_timeo * 1000 +
400 dhcpv6_rand_delay(retx->init_timeo * 1000)) :
401 (2 * rto + dhcpv6_rand_delay(rto));
403 if (rto >= retx->max_timeo * 1000)
404 rto = retx->max_timeo * 1000 +
405 dhcpv6_rand_delay(retx->max_timeo * 1000);
407 // Calculate end for this round and elapsed time
408 uint64_t round_end = round_start + rto;
409 elapsed = round_start - start;
411 // Don't wait too long
412 if (round_end - start > timeout * 1000)
413 round_end = timeout * 1000 + start;
415 // Built and send package
416 if (type != DHCPV6_MSG_UNKNOWN)
417 dhcpv6_send(type, trid, elapsed / 10);
420 for (; len < 0 && round_start < round_end;
421 round_start = odhcp6c_get_milli_time()) {
422 // Check for pending signal
423 if (odhcp6c_signal_process())
426 // Set timeout for receiving
427 uint64_t t = round_end - round_start;
428 struct timeval timeout = {t / 1000, (t % 1000) * 1000};
429 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
430 &timeout, sizeof(timeout));
433 len = recv(sock, buf, sizeof(buf), 0);
435 if (!dhcpv6_response_is_valid(buf, len, trid, type))
439 uint8_t *opt = &buf[4];
440 uint8_t *opt_end = opt + len - 4;
442 round_start = odhcp6c_get_milli_time();
443 elapsed = round_start - start;
444 syslog(LOG_NOTICE, "Got a valid reply after "
445 "%ums", (unsigned)elapsed);
447 if (retx->handler_reply)
448 len = retx->handler_reply(
451 if (len > 0 && round_end - round_start > 1000)
452 round_end = 1000 + round_start;
457 if (retx->handler_finish)
458 len = retx->handler_finish();
459 } while (len < 0 && elapsed / 1000 < timeout);
465 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
466 const uint8_t transaction[3], enum dhcpv6_msg type)
468 const struct dhcpv6_header *rep = buf;
469 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
470 transaction, sizeof(rep->tr_id)))
471 return false; // Invalid reply
473 if (type == DHCPV6_MSG_SOLICIT) {
474 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
475 rep->msg_type != DHCPV6_MSG_REPLY)
477 } else if (type == DHCPV6_MSG_UNKNOWN) {
478 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
480 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
484 uint8_t *end = ((uint8_t*)buf) + len, *odata;
485 uint16_t otype, olen;
486 bool clientid_ok = false, serverid_ok = false, rcauth_ok = false;
488 size_t client_id_len, server_id_len;
489 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
490 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
492 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata) {
493 if (otype == DHCPV6_OPT_CLIENTID) {
494 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
495 &odata[-4], client_id, client_id_len);
496 } else if (otype == DHCPV6_OPT_SERVERID) {
497 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
498 &odata[-4], server_id, server_id_len);
499 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
500 sizeof(struct dhcpv6_auth_reconfigure)) {
501 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
502 if (r->protocol != 3 || r->algorithm != 1 || r->reconf_type != 2)
506 uint8_t serverhash[16], secretbytes[16], hash[16];
507 memcpy(serverhash, r->key, sizeof(serverhash));
508 memset(r->key, 0, sizeof(r->key));
509 memcpy(secretbytes, reconf_key, sizeof(secretbytes));
511 for (size_t i = 0; i < sizeof(secretbytes); ++i)
512 secretbytes[i] ^= 0x36;
515 md5_append(&md5, secretbytes, sizeof(secretbytes));
516 md5_append(&md5, buf, len);
517 md5_finish(&md5, hash);
519 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
520 secretbytes[i] ^= 0x36;
521 secretbytes[i] ^= 0x5c;
525 md5_append(&md5, secretbytes, sizeof(secretbytes));
526 md5_append(&md5, hash, 16);
527 md5_finish(&md5, hash);
529 rcauth_ok = !memcmp(hash, serverhash, sizeof(hash));
533 if (rep->msg_type == DHCPV6_MSG_RECONF && !rcauth_ok)
536 return clientid_ok && (serverid_ok || server_id_len == 0);
540 int dhcpv6_poll_reconfigure(void)
542 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
544 ret = dhcpv6_request(ret);
550 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig,
551 const void *opt, const void *end)
553 // TODO: should verify the reconfigure message
554 uint16_t otype, olen;
555 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
556 dhcpv6_for_each_option(opt, end, otype, olen, odata)
557 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
558 odata[0] == DHCPV6_MSG_RENEW ||
559 odata[0] == DHCPV6_MSG_INFO_REQ))
562 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
567 // Collect all advertised servers
568 static int dhcpv6_handle_advert(enum dhcpv6_msg orig,
569 const void *opt, const void *end)
571 uint16_t olen, otype;
573 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}, NULL, NULL, 0, 0};
574 bool have_na = false;
577 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
578 if (orig == DHCPV6_MSG_SOLICIT &&
579 (otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA) &&
580 olen > sizeof(struct dhcpv6_ia_hdr)) {
581 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
582 dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
585 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
586 memcpy(cand.duid, odata, olen);
587 cand.duid_len = olen;
588 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 && !odata[0]
589 && odata[1] == DHCPV6_NoPrefixAvail) {
590 cand.preference -= 2000;
591 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
592 cand.preference >= 0) {
593 cand.preference = odata[0];
594 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
595 cand.wants_reconfigure = true;
596 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
597 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
598 uint8_t *oend = odata + olen, *d;
599 dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
600 if (otype == DHCPV6_OPT_IA_PREFIX && (olen + 4) >=
601 (uint16_t)sizeof(struct dhcpv6_ia_prefix)) {
602 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&d[-4];
606 } else if (otype == DHCPV6_OPT_IA_NA) {
607 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
608 uint8_t *oend = odata + olen, *d;
609 dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
610 if (otype == DHCPV6_OPT_IA_ADDR)
615 if ((!have_na && na_mode == IA_MODE_FORCE) ||
616 (!have_pd && pd_mode == IA_MODE_FORCE))
619 if (na_mode != IA_MODE_NONE && !have_na) {
620 cand.has_noaddravail = true;
621 cand.preference -= 1000;
624 if (pd_mode != IA_MODE_NONE) {
626 cand.preference += 2000 + (128 - have_pd);
628 cand.preference -= 2000;
631 if (cand.duid_len > 0) {
632 cand.ia_na = odhcp6c_move_state(STATE_IA_NA, &cand.ia_na_len);
633 cand.ia_pd = odhcp6c_move_state(STATE_IA_PD, &cand.ia_pd_len);
634 odhcp6c_add_state(STATE_SERVER_CAND, &cand, sizeof(cand));
637 if (orig == DHCPV6_MSG_SOLICIT) {
638 odhcp6c_clear_state(STATE_IA_NA);
639 odhcp6c_clear_state(STATE_IA_PD);
646 static int dhcpv6_commit_advert(void)
649 struct dhcpv6_server_cand *c = NULL, *cand =
650 odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
653 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
654 if (cand[i].has_noaddravail)
655 retry = true; // We want to try again
657 if (!c || c->preference < cand[i].preference)
661 if (retry && na_mode == IA_MODE_TRY) {
662 // We give it a second try without the IA_NA
663 na_mode = IA_MODE_NONE;
664 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
668 uint16_t hdr[2] = {htons(DHCPV6_OPT_SERVERID),
670 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
671 odhcp6c_add_state(STATE_SERVER_ID, c->duid, c->duid_len);
672 accept_reconfig = c->wants_reconfigure;
673 odhcp6c_add_state(STATE_IA_NA, c->ia_na, c->ia_na_len);
674 odhcp6c_add_state(STATE_IA_PD, c->ia_pd, c->ia_pd_len);
677 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
681 odhcp6c_clear_state(STATE_SERVER_CAND);
685 else if (request_prefix || na_mode != IA_MODE_NONE)
686 return DHCPV6_STATEFUL;
688 return DHCPV6_STATELESS;
692 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig,
693 const void *opt, const void *end)
695 dhcpv6_handle_advert(orig, opt, end);
696 if (dhcpv6_commit_advert() < 0) {
697 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
701 return dhcpv6_handle_reply(orig, opt, end);
705 static int dhcpv6_handle_reply(enum dhcpv6_msg orig,
706 const void *opt, const void *end)
709 uint16_t otype, olen;
713 if (orig == DHCPV6_MSG_UNKNOWN) {
714 static time_t last_update = 0;
715 time_t now = odhcp6c_get_milli_time() / 1000;
717 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
733 t1 = t2 = t3 = UINT32_MAX;
736 if (orig == DHCPV6_MSG_REQUEST) {
737 // Delete NA and PD we have in the state from the Advert
738 odhcp6c_clear_state(STATE_IA_NA);
739 odhcp6c_clear_state(STATE_IA_PD);
743 odhcp6c_clear_state(STATE_DNS);
744 odhcp6c_clear_state(STATE_SEARCH);
745 odhcp6c_clear_state(STATE_SNTP_IP);
746 odhcp6c_clear_state(STATE_SNTP_FQDN);
747 odhcp6c_clear_state(STATE_SIP_IP);
748 odhcp6c_clear_state(STATE_SIP_FQDN);
749 odhcp6c_clear_state(STATE_AFTR_NAME);
752 // Parse and find all matching IAs
753 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
754 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
755 && olen > sizeof(struct dhcpv6_ia_hdr)) {
756 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
757 uint32_t l_t1 = ntohl(ia_hdr->t1);
758 uint32_t l_t2 = ntohl(ia_hdr->t2);
760 // Test ID and T1-T2 validity
761 if (ia_hdr->iaid != 1 || l_t2 < l_t1)
765 uint16_t stype, slen;
767 // Test status and bail if error
768 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
770 if (stype == DHCPV6_OPT_STATUS && slen >= 2)
771 error = ((int)sdata[0]) << 8 | ((int)sdata[1]);
774 syslog(LOG_WARNING, "Server returned IAID status %i!", error);
780 uint32_t n = dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
792 if (l_t1 > 0 && t1 > l_t1)
795 if (l_t2 > 0 && t2 > l_t2)
798 } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
800 odhcp6c_add_state(STATE_DNS, odata, olen);
801 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
802 odhcp6c_add_state(STATE_SEARCH, odata, olen);
803 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
804 uint16_t stype, slen;
806 // Test status and bail if error
807 dhcpv6_for_each_option(odata, odata + olen,
808 stype, slen, sdata) {
809 if (slen == 16 && (stype == NTP_MC_ADDR ||
810 stype == NTP_SRV_ADDR))
811 odhcp6c_add_state(STATE_SNTP_IP,
813 else if (slen > 0 && stype == NTP_SRV_FQDN)
814 odhcp6c_add_state(STATE_SNTP_FQDN,
817 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
819 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
820 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
821 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
822 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
823 uint32_t refresh = ntohl(*((uint32_t*)odata));
824 if (refresh < (uint32_t)t1)
826 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
827 sizeof(struct dhcpv6_auth_reconfigure)) {
828 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
829 if (r->protocol == 3 && r->algorithm == 1 &&
831 memcpy(reconf_key, r->key, sizeof(r->key));
832 } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) {
834 odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
836 odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
837 } else if (otype != DHCPV6_OPT_CLIENTID &&
838 otype != DHCPV6_OPT_SERVERID) {
839 odhcp6c_add_state(STATE_CUSTOM_OPTS,
840 &odata[-4], olen + 4);
844 if (t1 == UINT32_MAX)
847 if (t2 == UINT32_MAX)
850 if (t3 == UINT32_MAX)
857 static uint32_t dhcpv6_parse_ia(void *opt, void *end)
859 uint32_t timeout = UINT32_MAX; // Minimum timeout
860 uint16_t otype, olen;
864 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
865 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
866 IN6ADDR_ANY_INIT, 0, 0, 0};
868 if (otype == DHCPV6_OPT_IA_PREFIX) {
869 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
870 if (olen + 4U < sizeof(*prefix))
873 entry.valid = ntohl(prefix->valid);
874 entry.preferred = ntohl(prefix->preferred);
876 if (entry.preferred > entry.valid)
879 entry.length = prefix->prefix;
880 entry.target = prefix->addr;
881 uint16_t stype, slen;
884 #ifdef EXT_PREFIX_CLASS
885 // Find prefix class, if any
886 dhcpv6_for_each_option(&prefix[1], odata + olen,
888 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
889 entry.class = sdata[0] << 8 | sdata[1];
894 dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
895 odata + olen, stype, slen, sdata) {
896 if (stype != DHCPV6_OPT_PD_EXCLUDE || slen < 2)
899 uint8_t elen = sdata[0];
903 if (elen <= 32 || elen <= entry.length) {
909 uint8_t bytes = ((elen - entry.length - 1) / 8) + 1;
915 uint32_t exclude = 0;
917 exclude = exclude << 8 | sdata[bytes];
920 exclude >>= 8 - ((elen - entry.length) % 8);
921 exclude <<= 64 - elen;
923 // Abusing router & priority fields for exclusion
924 entry.router = entry.target;
925 entry.router.s6_addr32[1] |= htonl(exclude);
926 entry.priority = elen;
930 odhcp6c_update_entry(STATE_IA_PD, &entry);
933 memset(&entry.router, 0, sizeof(entry.router));
934 } else if (otype == DHCPV6_OPT_IA_ADDR) {
935 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
936 if (olen + 4U < sizeof(*addr))
939 entry.preferred = ntohl(addr->preferred);
940 entry.valid = ntohl(addr->valid);
942 if (entry.preferred > entry.valid)
946 entry.target = addr->addr;
948 #ifdef EXT_PREFIX_CLASS
949 uint16_t stype, slen;
951 // Find prefix class, if any
952 dhcpv6_for_each_option(&addr[1], odata + olen,
954 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
955 entry.class = sdata[0] << 8 | sdata[1];
958 odhcp6c_update_entry(STATE_IA_NA, &entry);
960 if (entry.valid > 0 && timeout > entry.valid)
961 timeout = entry.valid;