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, 3600, "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)
95 request_prefix = request_pd;
97 sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
101 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
102 if (ioctl(sock, SIOCGIFINDEX, &ifr))
104 ifindex = ifr.ifr_ifindex;
106 // Create client DUID
107 size_t client_id_len;
108 odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
109 if (client_id_len == 0) {
110 ioctl(sock, SIOCGIFHWADDR, &ifr);
111 uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
112 DHCPV6_DUID_LLADDR, 0, 1};
113 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
115 uint8_t zero[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
116 struct ifreq ifs[100], *ifp, *ifend;
119 ifc.ifc_len = sizeof(ifs);
121 if (!memcmp(&duid[8], zero, ETHER_ADDR_LEN) &&
122 ioctl(sock, SIOCGIFCONF, &ifc) >= 0) {
123 // If our interface doesn't have an address...
124 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
125 for (ifp = ifc.ifc_req; ifp < ifend &&
126 !memcmp(&duid[8], zero, 6); ifp++) {
127 memcpy(ifr.ifr_name, ifp->ifr_name,
128 sizeof(ifr.ifr_name));
129 ioctl(sock, SIOCGIFHWADDR, &ifr);
130 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data,
135 odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
140 htons(DHCPV6_OPT_SIP_SERVER_D),
141 htons(DHCPV6_OPT_SIP_SERVER_A),
142 htons(DHCPV6_OPT_DNS_SERVERS),
143 htons(DHCPV6_OPT_DNS_DOMAIN),
144 htons(DHCPV6_OPT_NTP_SERVER),
145 htons(DHCPV6_OPT_SIP_SERVER_A),
146 htons(DHCPV6_OPT_AFTR_NAME),
147 htons(DHCPV6_OPT_PD_EXCLUDE),
148 #ifdef EXT_PREFIX_CLASS
149 htons(DHCPV6_OPT_PREFIX_CLASS),
152 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
155 // Configure IPv6-options
157 setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
158 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
159 setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
161 struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
162 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
163 if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)))
170 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd)
177 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
181 gethostname(fqdn_buf, sizeof(fqdn_buf));
188 size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
189 sizeof(fqdn.data), NULL, NULL);
190 fqdn.type = htons(DHCPV6_OPT_FQDN);
191 fqdn.len = htons(fqdn_len - 4);
197 void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
201 void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
204 size_t ia_pd_entries, ia_pd_len = 0;
205 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
206 ia_pd_entries /= sizeof(*e);
207 struct dhcpv6_ia_hdr hdr_ia_pd = {
208 htons(DHCPV6_OPT_IA_PD),
209 htons(sizeof(hdr_ia_pd) - 4),
214 uint8_t *ia_pd = alloca(ia_pd_entries * (sizeof(struct dhcpv6_ia_prefix) + 10));
215 for (size_t i = 0; i < ia_pd_entries; ++i) {
217 if (e[i].priority > 0)
218 ex_len = ((e[i].priority - e[i].length - 1) / 8) + 6;
220 struct dhcpv6_ia_prefix p = {
221 .type = htons(DHCPV6_OPT_IA_PREFIX),
222 .len = htons(sizeof(p) - 4U + ex_len),
223 .prefix = e[i].length,
227 memcpy(ia_pd + ia_pd_len, &p, sizeof(p));
228 ia_pd_len += sizeof(p);
231 ia_pd[ia_pd_len++] = 0;
232 ia_pd[ia_pd_len++] = DHCPV6_OPT_PD_EXCLUDE;
233 ia_pd[ia_pd_len++] = 0;
234 ia_pd[ia_pd_len++] = ex_len - 4;
235 ia_pd[ia_pd_len++] = e[i].priority;
237 uint32_t excl = ntohl(e[i].router.s6_addr32[1]);
238 excl >>= (64 - e[i].priority);
239 excl <<= 8 - ((e[i].priority - e[i].length) % 8);
241 for (size_t i = ex_len - 5; i > 0; --i, excl >>= 8)
242 ia_pd[ia_pd_len + i] = excl & 0xff;
243 ia_pd_len += ex_len - 5;
247 struct dhcpv6_ia_prefix pref = {
248 .type = htons(DHCPV6_OPT_IA_PREFIX),
249 .len = htons(25), .prefix = request_prefix
251 if (request_prefix > 0 && ia_pd_len == 0 && type == DHCPV6_MSG_SOLICIT) {
252 ia_pd = (uint8_t*)&pref;
253 ia_pd_len = sizeof(pref);
255 hdr_ia_pd.len = htons(ntohs(hdr_ia_pd.len) + ia_pd_len);
258 size_t ia_na_entries, ia_na_len = 0;
260 e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
261 ia_na_entries /= sizeof(*e);
263 struct dhcpv6_ia_hdr hdr_ia_na = {
264 htons(DHCPV6_OPT_IA_NA),
265 htons(sizeof(hdr_ia_na) - 4),
269 struct dhcpv6_ia_addr pa[ia_na_entries];
270 for (size_t i = 0; i < ia_na_entries; ++i) {
271 pa[i].type = htons(DHCPV6_OPT_IA_ADDR);
272 pa[i].len = htons(sizeof(pa[i]) - 4U);
273 pa[i].addr = e[i].target;
279 ia_na_len = sizeof(pa);
280 hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
282 // Reconfigure Accept
286 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
288 // Request Information Refresh
289 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
293 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
297 uint16_t elapsed_type;
298 uint16_t elapsed_len;
299 uint16_t elapsed_value;
303 type, {trid[0], trid[1], trid[2]},
304 htons(DHCPV6_OPT_ELAPSED), htons(2),
305 htons((ecs > 0xffff) ? 0xffff : ecs),
306 htons(DHCPV6_OPT_ORO), htons(oro_len),
309 struct iovec iov[] = {
314 {srv_id, srv_id_len},
315 {&reconf_accept, sizeof(reconf_accept)},
317 {&hdr_ia_na, sizeof(hdr_ia_na)},
319 {&hdr_ia_pd, sizeof(hdr_ia_pd)},
323 size_t cnt = ARRAY_SIZE(iov);
324 if (type == DHCPV6_MSG_INFO_REQ) {
326 iov[2].iov_len = sizeof(oro_refresh);
327 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
328 } else if (!request_prefix) {
332 // Disable IAs if not used
333 if (type != DHCPV6_MSG_SOLICIT) {
341 if (na_mode == IA_MODE_NONE)
344 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
345 0, ALL_DHCPV6_RELAYS, ifindex};
346 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
348 sendmsg(sock, &msg, 0);
352 static int64_t dhcpv6_rand_delay(int64_t time)
355 odhcp6c_random(&random, sizeof(random));
356 return (time * ((int64_t)random % 1000LL)) / 10000LL;
360 int dhcpv6_request(enum dhcpv6_msg type)
363 uint64_t timeout = UINT32_MAX;
364 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
367 struct timespec ts = {0, 0};
368 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
369 nanosleep(&ts, NULL);
372 if (type == DHCPV6_MSG_REQUEST)
374 else if (type == DHCPV6_MSG_RELEASE || type == DHCPV6_MSG_DECLINE)
376 else if (type == DHCPV6_MSG_UNKNOWN)
378 else if (type == DHCPV6_MSG_RENEW)
379 timeout = (t2 > t1) ? t2 - t1 : 0;
380 else if (type == DHCPV6_MSG_REBIND)
381 timeout = (t3 > t2) ? t3 - t2 : 0;
386 syslog(LOG_NOTICE, "Sending %s (timeout %us)", retx->name, (unsigned)timeout);
388 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
390 // Generate transaction ID
391 uint8_t trid[3] = {0, 0, 0};
392 if (type != DHCPV6_MSG_UNKNOWN)
393 odhcp6c_random(trid, sizeof(trid));
398 rto = (rto == 0) ? (retx->init_timeo * 1000 +
399 dhcpv6_rand_delay(retx->init_timeo * 1000)) :
400 (2 * rto + dhcpv6_rand_delay(rto));
402 if (rto >= retx->max_timeo * 1000)
403 rto = retx->max_timeo * 1000 +
404 dhcpv6_rand_delay(retx->max_timeo * 1000);
406 // Calculate end for this round and elapsed time
407 uint64_t round_end = round_start + rto;
408 elapsed = round_start - start;
410 // Don't wait too long
411 if (round_end - start > timeout * 1000)
412 round_end = timeout * 1000 + start;
414 // Built and send package
415 if (type != DHCPV6_MSG_UNKNOWN)
416 dhcpv6_send(type, trid, elapsed / 10);
419 for (; len < 0 && round_start < round_end;
420 round_start = odhcp6c_get_milli_time()) {
421 // Check for pending signal
422 if (odhcp6c_signal_process())
425 // Set timeout for receiving
426 uint64_t t = round_end - round_start;
427 struct timeval timeout = {t / 1000, (t % 1000) * 1000};
428 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
429 &timeout, sizeof(timeout));
432 len = recv(sock, buf, sizeof(buf), 0);
434 if (!dhcpv6_response_is_valid(buf, len, trid, type))
438 uint8_t *opt = &buf[4];
439 uint8_t *opt_end = opt + len - 4;
441 round_start = odhcp6c_get_milli_time();
442 elapsed = round_start - start;
443 syslog(LOG_NOTICE, "Got a valid reply after "
444 "%ums", (unsigned)elapsed);
446 if (retx->handler_reply)
447 len = retx->handler_reply(
450 if (len > 0 && round_end - round_start > 1000)
451 round_end = 1000 + round_start;
456 if (retx->handler_finish)
457 len = retx->handler_finish();
458 } while (len < 0 && elapsed / 1000 < timeout);
464 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
465 const uint8_t transaction[3], enum dhcpv6_msg type)
467 const struct dhcpv6_header *rep = buf;
468 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
469 transaction, sizeof(rep->tr_id)))
470 return false; // Invalid reply
472 if (type == DHCPV6_MSG_SOLICIT) {
473 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
474 rep->msg_type != DHCPV6_MSG_REPLY)
476 } else if (type == DHCPV6_MSG_UNKNOWN) {
477 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
479 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
483 uint8_t *end = ((uint8_t*)buf) + len, *odata;
484 uint16_t otype, olen;
485 bool clientid_ok = false, serverid_ok = false, rcauth_ok = false;
487 size_t client_id_len, server_id_len;
488 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
489 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
491 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata) {
492 if (otype == DHCPV6_OPT_CLIENTID) {
493 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
494 &odata[-4], client_id, client_id_len);
495 } else if (otype == DHCPV6_OPT_SERVERID) {
496 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
497 &odata[-4], server_id, server_id_len);
498 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
499 sizeof(struct dhcpv6_auth_reconfigure)) {
500 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
501 if (r->protocol != 3 || r->algorithm != 1 || r->reconf_type != 2)
505 uint8_t serverhash[16], secretbytes[16], hash[16];
506 memcpy(serverhash, r->key, sizeof(serverhash));
507 memset(r->key, 0, sizeof(r->key));
508 memcpy(secretbytes, reconf_key, sizeof(secretbytes));
510 for (size_t i = 0; i < sizeof(secretbytes); ++i)
511 secretbytes[i] ^= 0x36;
514 md5_append(&md5, secretbytes, sizeof(secretbytes));
515 md5_append(&md5, buf, len);
516 md5_finish(&md5, hash);
518 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
519 secretbytes[i] ^= 0x36;
520 secretbytes[i] ^= 0x5c;
524 md5_append(&md5, secretbytes, sizeof(secretbytes));
525 md5_append(&md5, hash, 16);
526 md5_finish(&md5, hash);
528 rcauth_ok = !memcmp(hash, serverhash, sizeof(hash));
532 if (rep->msg_type == DHCPV6_MSG_RECONF && !rcauth_ok)
535 return clientid_ok && (serverid_ok || server_id_len == 0);
539 int dhcpv6_poll_reconfigure(void)
541 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
543 ret = dhcpv6_request(ret);
549 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig,
550 const void *opt, const void *end)
552 // TODO: should verify the reconfigure message
553 uint16_t otype, olen;
554 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
555 dhcpv6_for_each_option(opt, end, otype, olen, odata)
556 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
557 odata[0] == DHCPV6_MSG_RENEW ||
558 odata[0] == DHCPV6_MSG_INFO_REQ))
561 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
566 // Collect all advertised servers
567 static int dhcpv6_handle_advert(enum dhcpv6_msg orig,
568 const void *opt, const void *end)
570 uint16_t olen, otype;
572 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}, NULL, NULL, 0, 0};
573 bool have_na = false;
576 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
577 if (orig == DHCPV6_MSG_SOLICIT &&
578 (otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA) &&
579 olen > sizeof(struct dhcpv6_ia_hdr)) {
580 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
581 dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
584 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
585 memcpy(cand.duid, odata, olen);
586 cand.duid_len = olen;
587 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2 && !odata[0]
588 && odata[1] == DHCPV6_NoPrefixAvail) {
589 cand.preference -= 2000;
590 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
591 cand.preference >= 0) {
592 cand.preference = odata[0];
593 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
594 cand.wants_reconfigure = true;
595 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
596 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
597 uint8_t *oend = odata + olen, *d;
598 dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
599 if (otype == DHCPV6_OPT_IA_PREFIX && (olen + 4) >=
600 (uint16_t)sizeof(struct dhcpv6_ia_prefix)) {
601 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
605 } else if (otype == DHCPV6_OPT_IA_NA) {
606 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
607 uint8_t *oend = odata + olen, *d;
608 dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
609 if (otype == DHCPV6_OPT_IA_ADDR)
614 if ((!have_na && na_mode == IA_MODE_FORCE) ||
615 (!have_pd && pd_mode == IA_MODE_FORCE))
618 if (na_mode != IA_MODE_NONE && !have_na) {
619 cand.has_noaddravail = true;
620 cand.preference -= 1000;
623 if (pd_mode != IA_MODE_NONE) {
625 cand.preference += 2000 + (128 - have_pd);
627 cand.preference -= 2000;
630 if (cand.duid_len > 0) {
631 cand.ia_na = odhcp6c_move_state(STATE_IA_NA, &cand.ia_na_len);
632 cand.ia_pd = odhcp6c_move_state(STATE_IA_PD, &cand.ia_pd_len);
633 odhcp6c_add_state(STATE_SERVER_CAND, &cand, sizeof(cand));
636 if (orig == DHCPV6_MSG_SOLICIT) {
637 odhcp6c_clear_state(STATE_IA_NA);
638 odhcp6c_clear_state(STATE_IA_PD);
645 static int dhcpv6_commit_advert(void)
648 struct dhcpv6_server_cand *c = NULL, *cand =
649 odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
652 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
653 if (cand[i].has_noaddravail)
654 retry = true; // We want to try again
656 if (!c || c->preference < cand[i].preference)
660 if (retry && na_mode == IA_MODE_TRY) {
661 // We give it a second try without the IA_NA
662 na_mode = IA_MODE_NONE;
663 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
667 uint16_t hdr[2] = {htons(DHCPV6_OPT_SERVERID),
669 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
670 odhcp6c_add_state(STATE_SERVER_ID, c->duid, c->duid_len);
671 accept_reconfig = c->wants_reconfigure;
672 odhcp6c_add_state(STATE_IA_NA, c->ia_na, c->ia_na_len);
673 odhcp6c_add_state(STATE_IA_PD, c->ia_pd, c->ia_pd_len);
676 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
680 odhcp6c_clear_state(STATE_SERVER_CAND);
684 else if (request_prefix || na_mode != IA_MODE_NONE)
685 return DHCPV6_STATEFUL;
687 return DHCPV6_STATELESS;
691 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig,
692 const void *opt, const void *end)
694 dhcpv6_handle_advert(orig, opt, end);
695 if (dhcpv6_commit_advert() < 0) {
696 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, NULL, NULL);
700 return dhcpv6_handle_reply(orig, opt, end);
704 static int dhcpv6_handle_reply(enum dhcpv6_msg orig,
705 const void *opt, const void *end)
708 uint16_t otype, olen;
712 if (orig == DHCPV6_MSG_UNKNOWN) {
713 static time_t last_update = 0;
714 time_t now = odhcp6c_get_milli_time() / 1000;
716 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
732 t1 = t2 = t3 = UINT32_MAX;
735 if (orig == DHCPV6_MSG_REQUEST) {
736 // Delete NA and PD we have in the state from the Advert
737 odhcp6c_clear_state(STATE_IA_NA);
738 odhcp6c_clear_state(STATE_IA_PD);
742 odhcp6c_clear_state(STATE_DNS);
743 odhcp6c_clear_state(STATE_SEARCH);
744 odhcp6c_clear_state(STATE_SNTP_IP);
745 odhcp6c_clear_state(STATE_SNTP_FQDN);
746 odhcp6c_clear_state(STATE_SIP_IP);
747 odhcp6c_clear_state(STATE_SIP_FQDN);
748 odhcp6c_clear_state(STATE_AFTR_NAME);
751 // Parse and find all matching IAs
752 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
753 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
754 && olen > sizeof(struct dhcpv6_ia_hdr)) {
755 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
756 uint32_t l_t1 = ntohl(ia_hdr->t1);
757 uint32_t l_t2 = ntohl(ia_hdr->t2);
759 // Test ID and T1-T2 validity
760 if (ia_hdr->iaid != 1 || l_t2 < l_t1)
764 uint16_t stype, slen;
766 // Test status and bail if error
767 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
769 if (stype == DHCPV6_OPT_STATUS && slen >= 2)
770 error = ((int)sdata[0]) << 8 | ((int)sdata[1]);
773 syslog(LOG_WARNING, "Server returned IAID status %i!", error);
779 uint32_t n = dhcpv6_parse_ia(&ia_hdr[1], odata + olen);
791 if (l_t1 > 0 && t1 > l_t1)
794 if (l_t2 > 0 && t2 > l_t2)
797 } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
799 odhcp6c_add_state(STATE_DNS, odata, olen);
800 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
801 odhcp6c_add_state(STATE_SEARCH, odata, olen);
802 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
803 uint16_t stype, slen;
805 // Test status and bail if error
806 dhcpv6_for_each_option(odata, odata + olen,
807 stype, slen, sdata) {
808 if (slen == 16 && (stype == NTP_MC_ADDR ||
809 stype == NTP_SRV_ADDR))
810 odhcp6c_add_state(STATE_SNTP_IP,
812 else if (slen > 0 && stype == NTP_SRV_FQDN)
813 odhcp6c_add_state(STATE_SNTP_FQDN,
816 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
818 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
819 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
820 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
821 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
822 uint32_t refresh = ntohl(*((uint32_t*)odata));
823 if (refresh < (uint32_t)t1)
825 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
826 sizeof(struct dhcpv6_auth_reconfigure)) {
827 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
828 if (r->protocol == 3 && r->algorithm == 1 &&
830 memcpy(reconf_key, r->key, sizeof(r->key));
831 } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) {
833 odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
835 odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
836 } else if (otype != DHCPV6_OPT_CLIENTID &&
837 otype != DHCPV6_OPT_SERVERID) {
838 odhcp6c_add_state(STATE_CUSTOM_OPTS,
839 &odata[-4], olen + 4);
843 if (t1 == UINT32_MAX)
846 if (t2 == UINT32_MAX)
849 if (t3 == UINT32_MAX)
856 static uint32_t dhcpv6_parse_ia(void *opt, void *end)
858 uint32_t timeout = UINT32_MAX; // Minimum timeout
859 uint16_t otype, olen;
863 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
864 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
865 IN6ADDR_ANY_INIT, 0, 0, 0};
867 if (otype == DHCPV6_OPT_IA_PREFIX) {
868 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
869 if (olen + 4U < sizeof(*prefix))
872 entry.valid = ntohl(prefix->valid);
873 entry.preferred = ntohl(prefix->preferred);
875 if (entry.preferred > entry.valid)
878 entry.length = prefix->prefix;
879 entry.target = prefix->addr;
880 uint16_t stype, slen;
883 #ifdef EXT_PREFIX_CLASS
884 // Find prefix class, if any
885 dhcpv6_for_each_option(&prefix[1], odata + olen,
887 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
888 entry.class = sdata[0] << 8 | sdata[1];
893 dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
894 odata + olen, stype, slen, sdata) {
895 if (stype != DHCPV6_OPT_PD_EXCLUDE || slen < 2)
898 uint8_t elen = sdata[0];
902 if (elen <= 32 || elen <= entry.length) {
908 uint8_t bytes = ((elen - entry.length - 1) / 8) + 1;
914 uint32_t exclude = 0;
916 exclude = exclude << 8 | sdata[bytes];
919 exclude >>= 8 - ((elen - entry.length) % 8);
920 exclude <<= 64 - elen;
922 // Abusing router & priority fields for exclusion
923 entry.router = entry.target;
924 entry.router.s6_addr32[1] |= htonl(exclude);
925 entry.priority = elen;
929 odhcp6c_update_entry(STATE_IA_PD, &entry);
932 memset(&entry.router, 0, sizeof(entry.router));
933 } else if (otype == DHCPV6_OPT_IA_ADDR) {
934 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
935 if (olen + 4U < sizeof(*addr))
938 entry.preferred = ntohl(addr->preferred);
939 entry.valid = ntohl(addr->valid);
941 if (entry.preferred > entry.valid)
945 entry.target = addr->addr;
947 #ifdef EXT_PREFIX_CLASS
948 uint16_t stype, slen;
950 // Find prefix class, if any
951 dhcpv6_for_each_option(&addr[1], odata + olen,
953 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
954 entry.class = sdata[0] << 8 | sdata[1];
957 odhcp6c_update_entry(STATE_IA_NA, &entry);
959 if (entry.valid > 0 && timeout > entry.valid)
960 timeout = entry.valid;