2 * Copyright (C) 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.
18 #include "libubox/md5.h"
28 #include <arpa/inet.h>
29 #include <sys/timerfd.h>
32 static void update(struct interface *iface);
33 static void reconf_timer(struct uloop_timeout *event);
34 static struct uloop_timeout reconf_event = {.cb = reconf_timer};
35 static uint32_t serial = 0;
36 static uint8_t statemd5[16];
39 int dhcpv6_ia_init(void)
41 uloop_timeout_set(&reconf_event, 2000);
46 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
48 if (!enable && iface->ia_assignments.next) {
49 struct dhcpv6_assignment *c;
50 while (!list_empty(&iface->ia_assignments)) {
51 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
59 if (iface->dhcpv6 == RELAYD_SERVER) {
60 if (!iface->ia_assignments.next)
61 INIT_LIST_HEAD(&iface->ia_assignments);
63 if (list_empty(&iface->ia_assignments)) {
64 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
66 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
71 list_add(&border->head, &iface->ia_assignments);
76 // Parse static entries
78 list_for_each_entry(lease, &leases, head) {
80 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + lease->duid_len);
82 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
87 a->clid_len = lease->duid_len;
90 a->assigned = lease->hostid;
92 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
93 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
95 odhcpd_urandom(a->key, sizeof(a->key));
96 memcpy(a->clid_data, lease->duid, a->clid_len);
97 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
99 // Assign to all interfaces
100 struct dhcpv6_assignment *c;
101 list_for_each_entry(c, &iface->ia_assignments, head) {
102 if (c->length != 128 || c->assigned > a->assigned) {
103 list_add_tail(&a->head, &c->head);
105 } else if (c->assigned == a->assigned) {
106 // Already an assignment with that number
112 if (lease->hostname[0]) {
114 a->hostname = strdup(lease->hostname);
127 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
130 struct dhcpv6_client_header hdr;
134 uint16_t hardware_type;
139 struct dhcpv6_auth_reconfigure auth;
142 uint8_t clid_data[128];
143 } __attribute__((packed)) reconf_msg = {
144 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
145 .srvid_type = htons(DHCPV6_OPT_SERVERID),
146 .srvid_len = htons(10),
147 .duid_type = htons(3),
148 .hardware_type = htons(1),
149 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
151 .msg_id = DHCPV6_MSG_RENEW,
152 .auth = {htons(DHCPV6_OPT_AUTH),
153 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
154 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
155 .clid_type = htons(DHCPV6_OPT_CLIENTID),
156 .clid_len = htons(assign->clid_len),
160 odhcpd_get_mac(iface, reconf_msg.mac);
161 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
162 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
165 uint8_t secretbytes[16];
166 memcpy(secretbytes, assign->key, sizeof(secretbytes));
168 for (size_t i = 0; i < sizeof(secretbytes); ++i)
169 secretbytes[i] ^= 0x36;
172 md5_hash(secretbytes, sizeof(secretbytes), &md5);
173 md5_hash(iov.iov_base, iov.iov_len, &md5);
174 md5_end(reconf_msg.auth.key, &md5);
176 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
177 secretbytes[i] ^= 0x36;
178 secretbytes[i] ^= 0x5c;
182 md5_hash(secretbytes, sizeof(secretbytes), &md5);
183 md5_hash(reconf_msg.auth.key, 16, &md5);
184 md5_end(reconf_msg.auth.key, &md5);
186 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
190 void dhcpv6_write_statefile(void)
195 if (config.dhcp_statefile) {
196 time_t now = odhcpd_time(), wall_time = time(NULL);
197 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
201 lockf(fd, F_LOCK, 0);
204 FILE *fp = fdopen(fd, "w");
210 struct interface *iface;
211 list_for_each_entry(iface, &interfaces, head) {
212 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
215 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
216 struct dhcpv6_assignment *c;
217 list_for_each_entry(c, &iface->ia_assignments, head) {
218 if (c->clid_len == 0)
221 char ipbuf[INET6_ADDRSTRLEN];
224 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
226 // iface DUID iaid hostname lifetime assigned length [addrs...]
227 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %u %x %u ",
228 iface->ifname, duidbuf, ntohl(c->iaid),
229 (c->hostname ? c->hostname : "-"),
230 (unsigned)(c->valid_until > now ?
231 (c->valid_until - now + wall_time) : 0),
232 c->assigned, (unsigned)c->length);
234 struct in6_addr addr;
235 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
236 if (iface->ia_addr[i].prefix > 64)
239 addr = iface->ia_addr[i].addr;
240 if (c->length == 128)
241 addr.s6_addr32[3] = htonl(c->assigned);
243 addr.s6_addr32[1] |= htonl(c->assigned);
244 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
246 if (c->length == 128 && c->hostname && i == 0) {
250 if (dn_expand(iface->search, iface->search + iface->search_len,
251 iface->search, b, sizeof(b)) > 0)
252 fprintf(fp, "\t%s.%s", c->hostname, b);
254 fprintf(fp, "\t%s\n", c->hostname);
255 md5_hash(ipbuf, strlen(ipbuf), &md5);
256 md5_hash(c->hostname, strlen(c->hostname), &md5);
259 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%hhu ", ipbuf, c->length);
261 leasebuf[l - 1] = '\n';
262 fwrite(leasebuf, 1, l, fp);
266 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
267 struct dhcpv4_assignment *c;
268 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
269 char ipbuf[INET6_ADDRSTRLEN];
272 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
274 // iface DUID iaid hostname lifetime assigned length [addrs...]
275 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %u %x 32 ",
276 iface->ifname, duidbuf,
277 (c->hostname ? c->hostname : "-"),
278 (unsigned)(c->valid_until > now ?
279 (c->valid_until - now + wall_time) : 0),
282 struct in_addr addr = {htonl(c->addr)};
283 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
285 if (c->hostname[0]) {
289 if (dn_expand(iface->search, iface->search + iface->search_len,
290 iface->search, b, sizeof(b)) > 0)
291 fprintf(fp, "\t%s.%s", c->hostname, b);
293 fprintf(fp, "\t%s\n", c->hostname);
294 md5_hash(ipbuf, strlen(ipbuf), &md5);
295 md5_hash(c->hostname, strlen(c->hostname), &md5);
298 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
299 leasebuf[l - 1] = '\n';
300 fwrite(leasebuf, 1, l, fp);
309 md5_end(newmd5, &md5);
311 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
312 memcpy(statemd5, newmd5, sizeof(statemd5));
313 char *argv[2] = {config.dhcp_cb, NULL};
315 execv(argv[0], argv);
322 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
327 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
328 struct in6_addr prefix = iface->ia_addr[i].addr;
329 prefix.s6_addr32[1] |= htonl(a->assigned);
330 odhcpd_setup_route(&prefix, a->length, iface, &a->peer.sin6_addr, add);
335 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
337 struct dhcpv6_assignment *c;
338 if (iface->ia_addr_len < 1)
341 // Try honoring the hint first
342 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
343 if (assign->assigned) {
344 list_for_each_entry(c, &iface->ia_assignments, head) {
345 if (c->length == 128)
348 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
349 list_add_tail(&assign->head, &c->head);
350 apply_lease(iface, assign, true);
354 if (c->assigned != 0)
355 current = (c->assigned + (1 << (64 - c->length)));
359 // Fallback to a variable assignment
361 list_for_each_entry(c, &iface->ia_assignments, head) {
362 if (c->length == 128)
365 current = (current + asize) & (~asize);
366 if (current + asize < c->assigned) {
367 assign->assigned = current;
368 list_add_tail(&assign->head, &c->head);
369 apply_lease(iface, assign, true);
373 if (c->assigned != 0)
374 current = (c->assigned + (1 << (64 - c->length)));
381 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
384 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
385 if (!iface->ia_addr[i].has_class) {
388 } else if (assign->classes_cnt) {
389 for (size_t j = 0; j < assign->classes_cnt; ++j)
390 if (assign->classes[j] == iface->ia_addr[i].class)
392 } else if (assign->all_class) {
400 // Seed RNG with checksum of DUID
402 for (size_t i = 0; i < assign->clid_len; ++i)
403 seed += assign->clid_data[i];
406 // Try to assign up to 100x
407 for (size_t i = 0; i < 100; ++i) {
409 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
411 struct dhcpv6_assignment *c;
412 list_for_each_entry(c, &iface->ia_assignments, head) {
413 if (c->assigned > try || c->length != 128) {
414 assign->assigned = try;
415 list_add_tail(&assign->head, &c->head);
417 } else if (c->assigned == try) {
427 static int prefixcmp(const void *va, const void *vb)
429 const struct odhcpd_ipaddr *a = va, *b = vb;
430 uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1;
431 uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1;
432 return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
436 static void update(struct interface *iface)
438 struct odhcpd_ipaddr addr[8];
439 memset(addr, 0, sizeof(addr));
440 int len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8);
445 qsort(addr, len, sizeof(*addr), prefixcmp);
447 time_t now = odhcpd_time();
450 for (int i = 0; i < len; ++i) {
451 if (addr[i].prefix > minprefix)
452 minprefix = addr[i].prefix;
454 addr[i].addr.s6_addr32[2] = 0;
455 addr[i].addr.s6_addr32[3] = 0;
457 if (addr[i].preferred < UINT32_MAX - now)
458 addr[i].preferred += now;
460 if (addr[i].valid < UINT32_MAX - now)
461 addr[i].valid += now;
464 struct dhcpv6_assignment *border = list_last_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
465 border->assigned = 1 << (64 - minprefix);
467 bool change = len != (int)iface->ia_addr_len;
468 for (int i = 0; !change && i < len; ++i)
469 if (addr[i].addr.s6_addr32[0] != iface->ia_addr[i].addr.s6_addr32[0] ||
470 addr[i].addr.s6_addr32[1] != iface->ia_addr[i].addr.s6_addr32[1] ||
471 (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) ||
472 (addr[i].valid > (uint32_t)now + 7200) !=
473 (iface->ia_addr[i].valid > (uint32_t)now + 7200))
477 struct dhcpv6_assignment *c;
478 list_for_each_entry(c, &iface->ia_assignments, head)
480 apply_lease(iface, c, false);
483 memcpy(iface->ia_addr, addr, len * sizeof(*addr));
484 iface->ia_addr_len = len;
486 if (change) { // Addresses / prefixes have changed
487 struct list_head reassign = LIST_HEAD_INIT(reassign);
488 struct dhcpv6_assignment *c, *d;
489 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
490 if (c->clid_len == 0 || c->valid_until < now)
493 if (c->length < 128 && c->assigned >= border->assigned && c != border)
494 list_move(&c->head, &reassign);
495 else if (c != border)
496 apply_lease(iface, c, true);
498 if (c->accept_reconf && c->reconf_cnt == 0) {
500 c->reconf_sent = now;
501 send_reconf(iface, c);
503 // Leave all other assignments of that client alone
504 struct dhcpv6_assignment *a;
505 list_for_each_entry(a, &iface->ia_assignments, head)
506 if (a != c && a->clid_len == c->clid_len &&
507 !memcmp(a->clid_data, c->clid_data, a->clid_len))
508 c->reconf_cnt = INT_MAX;
512 while (!list_empty(&reassign)) {
513 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
515 if (!assign_pd(iface, c)) {
517 list_add(&c->head, &iface->ia_assignments);
521 dhcpv6_write_statefile();
526 static void reconf_timer(struct uloop_timeout *event)
528 time_t now = odhcpd_time();
529 struct interface *iface;
530 list_for_each_entry(iface, &interfaces, head) {
531 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
534 struct dhcpv6_assignment *a, *n;
535 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
536 if (a->valid_until < now) {
537 if ((a->length < 128 && a->clid_len > 0) ||
538 (a->length == 128 && a->clid_len == 0)) {
544 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
545 now > a->reconf_sent + (1 << a->reconf_cnt)) {
547 a->reconf_sent = now;
548 send_reconf(iface, a);
552 if (iface->ia_reconf) {
554 iface->ia_reconf = false;
558 uloop_timeout_set(event, 2000);
562 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
563 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
564 struct interface *iface, bool request)
566 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
569 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
570 size_t datalen = sizeof(out);
571 time_t now = odhcpd_time();
574 struct __attribute__((packed)) {
578 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
581 memcpy(buf + datalen, &stat, sizeof(stat));
582 datalen += sizeof(stat);
585 uint32_t pref = 3600;
586 uint32_t valid = 3600;
588 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
590 if (iface->ia_addr[i].has_class) {
592 if (a->classes_cnt) {
593 for (size_t j = 0; j < a->classes_cnt; ++j)
594 if (a->classes[j] == iface->ia_addr[i].class)
596 } else if (a->all_class) {
604 uint32_t prefix_pref = iface->ia_addr[i].preferred - now;
605 uint32_t prefix_valid = iface->ia_addr[i].valid - now;
607 if (iface->ia_addr[i].prefix > 64 ||
608 iface->ia_addr[i].preferred <= (uint32_t)now)
611 if (prefix_pref > 86400)
614 if (prefix_valid > 86400)
615 prefix_valid = 86400;
617 #ifdef DHCPV6_OPT_PREFIX_CLASS
622 } pclass = {htons(DHCPV6_OPT_PREFIX_CLASS),
623 htons(2), htons(iface->ia_addr[i].class)};
626 if (a->length < 128) {
627 struct dhcpv6_ia_prefix p = {
628 .type = htons(DHCPV6_OPT_IA_PREFIX),
629 .len = htons(sizeof(p) - 4),
630 .preferred = htonl(prefix_pref),
631 .valid = htonl(prefix_valid),
633 .addr = iface->ia_addr[i].addr
635 p.addr.s6_addr32[1] |= htonl(a->assigned);
636 size_t entrlen = sizeof(p) - 4;
638 #ifdef DHCPV6_OPT_PREFIX_CLASS
639 if (iface->ia_addr[i].has_class) {
640 entrlen += sizeof(pclass);
641 p.len = htons(entrlen);
645 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
648 memcpy(buf + datalen, &p, sizeof(p));
649 #ifdef DHCPV6_OPT_PREFIX_CLASS
650 memcpy(buf + datalen + sizeof(p), &pclass, sizeof(pclass));
652 datalen += entrlen + 4;
654 struct dhcpv6_ia_addr n = {
655 .type = htons(DHCPV6_OPT_IA_ADDR),
656 .len = htons(sizeof(n) - 4),
657 .addr = iface->ia_addr[i].addr,
658 .preferred = htonl(prefix_pref),
659 .valid = htonl(prefix_valid)
661 n.addr.s6_addr32[3] = htonl(a->assigned);
662 size_t entrlen = sizeof(n) - 4;
664 #ifdef DHCPV6_OPT_PREFIX_CLASS
665 if (iface->ia_addr[i].has_class) {
666 entrlen += sizeof(pclass);
667 n.len = htons(entrlen);
671 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
674 memcpy(buf + datalen, &n, sizeof(n));
675 #ifdef DHCPV6_OPT_PREFIX_CLASS
676 memcpy(buf + datalen + sizeof(n), &pclass, sizeof(pclass));
678 datalen += entrlen + 4;
681 // Calculate T1 / T2 based on non-deprecated addresses
682 if (prefix_pref > 0) {
683 if (prefix_pref < pref)
686 if (prefix_valid < valid)
687 valid = prefix_valid;
691 a->valid_until = valid + now;
692 out.t1 = htonl(pref * 5 / 10);
693 out.t2 = htonl(pref * 8 / 10);
703 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
704 uint16_t otype, olen;
705 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
706 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
707 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
708 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
709 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
714 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
715 if (iface->ia_addr[i].prefix > 64 ||
716 iface->ia_addr[i].preferred <= (uint32_t)now)
719 struct in6_addr addr = iface->ia_addr[i].addr;
720 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
721 addr.s6_addr32[1] |= htonl(a->assigned);
723 if (IN6_ARE_ADDR_EQUAL(&p->addr, &addr) &&
724 p->prefix == a->length)
727 addr.s6_addr32[3] = htonl(a->assigned);
729 if (IN6_ARE_ADDR_EQUAL(&n->addr, &addr))
736 if (otype == DHCPV6_OPT_IA_PREFIX) {
737 struct dhcpv6_ia_prefix inv = {
738 .type = htons(DHCPV6_OPT_IA_PREFIX),
739 .len = htons(sizeof(inv) - 4),
746 if (datalen + sizeof(inv) > buflen)
749 memcpy(buf + datalen, &inv, sizeof(inv));
750 datalen += sizeof(inv);
752 struct dhcpv6_ia_addr inv = {
753 .type = htons(DHCPV6_OPT_IA_ADDR),
754 .len = htons(sizeof(inv) - 4),
760 if (datalen + sizeof(inv) > buflen)
763 memcpy(buf + datalen, &inv, sizeof(inv));
764 datalen += sizeof(inv);
771 out.len = htons(datalen - 4);
772 memcpy(buf, &out, sizeof(out));
777 size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
778 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
780 time_t now = odhcpd_time();
781 size_t response_len = 0;
782 const struct dhcpv6_client_header *hdr = data;
783 uint8_t *start = (uint8_t*)&hdr[1], *odata;
784 uint16_t otype, olen;
786 // Find and parse client-id and hostname
787 bool accept_reconf = false;
788 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
790 size_t hostname_len = 0;
791 bool class_oro = false;
792 dhcpv6_for_each_option(start, end, otype, olen, odata) {
793 if (otype == DHCPV6_OPT_CLIENTID) {
797 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
798 memcpy(mac, &odata[8], sizeof(mac));
799 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
800 memcpy(mac, &odata[4], sizeof(mac));
801 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
802 uint8_t fqdn_buf[256];
803 memcpy(fqdn_buf, odata, olen);
804 fqdn_buf[olen++] = 0;
806 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
807 hostname_len = strcspn(hostname, ".");
808 } else if (otype == DHCPV6_OPT_ORO) {
809 #ifdef DHCPV6_OPT_PREFIX_CLASS
810 for (size_t i = 0; i + 1 < olen; i += 2) {
811 if (odata[i] == (DHCPV6_OPT_PREFIX_CLASS >> 8) &&
812 odata[i + 1] == (DHCPV6_OPT_PREFIX_CLASS & 0xff))
816 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
817 accept_reconf = true;
821 if (!clid_data || !clid_len || clid_len > 130)
825 bool update_state = false;
827 struct dhcpv6_assignment *first = NULL;
828 dhcpv6_for_each_option(start, end, otype, olen, odata) {
829 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
830 bool is_na = (otype == DHCPV6_OPT_IA_NA);
831 if (!is_pd && !is_na)
834 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
835 size_t ia_response_len = 0;
836 uint8_t reqlen = (is_pd) ? 62 : 128;
837 uint32_t reqhint = 0;
839 const uint8_t classes_max = 32;
840 uint8_t classes_cnt = 0;
841 uint16_t classes[classes_max];
843 // Parse request hint for IA-PD
846 uint16_t stype, slen;
847 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
848 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
851 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
854 reqhint = ntohl(p->addr.s6_addr32[1]);
855 if (reqlen > 32 && reqlen <= 64)
856 reqhint &= (1U << (64 - reqlen)) - 1;
859 #ifdef DHCPV6_OPT_PREFIX_CLASS
861 uint16_t xtype, xlen;
862 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
863 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
866 if (classes_cnt >= classes_max)
869 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
878 uint16_t stype, slen;
879 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
880 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
883 #ifdef DHCPV6_OPT_PREFIX_CLASS
885 uint16_t xtype, xlen;
886 struct dhcpv6_ia_addr *p = (struct dhcpv6_ia_addr*)&sdata[-4];
887 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
888 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
891 if (classes_cnt >= classes_max)
894 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
901 struct dhcpv6_assignment *c, *a = NULL;
902 list_for_each_entry(c, &iface->ia_assignments, head) {
903 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
904 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
905 && !memcmp(c->mac, mac, sizeof(mac)))) &&
906 (c->iaid == ia->iaid || c->valid_until < now) &&
907 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
911 apply_lease(iface, a, false);
912 memcpy(a->clid_data, clid_data, clid_len);
913 a->clid_len = clid_len;
918 a->all_class = class_oro;
919 a->classes_cnt = classes_cnt;
920 a->classes = realloc(a->classes, classes_cnt * sizeof(uint16_t));
922 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
927 // Generic message handling
928 uint16_t status = DHCPV6_STATUS_OK;
929 if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
932 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
933 a = calloc(1, sizeof(*a) + clid_len);
935 a->clid_len = clid_len;
939 a->assigned = reqhint;
940 a->all_class = class_oro;
941 a->classes_cnt = classes_cnt;
943 a->classes = malloc(classes_cnt * sizeof(uint16_t));
945 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
949 memcpy(a->key, first->key, sizeof(a->key));
951 odhcpd_urandom(a->key, sizeof(a->key));
952 memcpy(a->clid_data, clid_data, clid_len);
955 while (!(assigned = assign_pd(iface, a)) && ++a->length <= 64);
957 assigned = assign_na(iface, a);
961 if (!assigned || iface->ia_addr_len == 0) { // Set error status
962 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
963 } else if (assigned && !first) { //
964 size_t handshake_len = 4;
966 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
970 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
971 struct dhcpv6_auth_reconfigure auth = {
972 htons(DHCPV6_OPT_AUTH),
973 htons(sizeof(auth) - 4),
975 {htonl(time(NULL)), htonl(++serial)},
979 memcpy(auth.key, a->key, sizeof(a->key));
980 memcpy(buf + handshake_len, &auth, sizeof(auth));
981 handshake_len += sizeof(auth);
984 buf += handshake_len;
985 buflen -= handshake_len;
986 response_len += handshake_len;
991 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
993 // Was only a solicitation: mark binding for removal
994 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
996 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
997 if (hostname_len > 0) {
998 a->hostname = realloc(a->hostname, hostname_len + 1);
1000 memcpy(a->hostname, hostname, hostname_len);
1001 a->hostname[hostname_len] = 0;
1004 a->accept_reconf = accept_reconf;
1005 apply_lease(iface, a, true);
1006 update_state = true;
1007 } else if (!assigned && a) { // Cleanup failed assignment
1012 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1013 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1014 hdr->msg_type == DHCPV6_MSG_REBIND ||
1015 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1016 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1017 status = DHCPV6_STATUS_NOBINDING;
1018 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1019 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1020 hdr->msg_type == DHCPV6_MSG_REBIND) {
1021 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1023 apply_lease(iface, a, true);
1024 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1026 apply_lease(iface, a, false);
1027 update_state = true;
1028 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1030 a->valid_until = now + 3600; // Block address for 1h
1031 update_state = true;
1033 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1034 // Always send NOTONLINK for CONFIRM so that clients restart connection
1035 status = DHCPV6_STATUS_NOTONLINK;
1036 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1039 buf += ia_response_len;
1040 buflen -= ia_response_len;
1041 response_len += ia_response_len;
1044 if (hdr->msg_type == DHCPV6_MSG_RELEASE && response_len + 6 < buflen) {
1046 buf[1] = DHCPV6_OPT_STATUS;
1050 buf[5] = DHCPV6_STATUS_OK;
1055 dhcpv6_write_statefile();
1058 return response_len;