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 int socket_fd = -1;
36 static uint32_t serial = 0;
39 int dhcpv6_ia_init(int dhcpv6_socket)
41 socket_fd = dhcpv6_socket;
42 uloop_timeout_set(&reconf_event, 2000);
47 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
49 if (!enable && iface->ia_assignments.next) {
50 struct dhcpv6_assignment *c;
51 while (!list_empty(&iface->ia_assignments)) {
52 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
60 if (iface->dhcpv6 == RELAYD_SERVER) {
61 if (!iface->ia_assignments.next)
62 INIT_LIST_HEAD(&iface->ia_assignments);
64 if (list_empty(&iface->ia_assignments)) {
65 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
67 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
72 list_add(&border->head, &iface->ia_assignments);
77 // Parse static entries
79 list_for_each_entry(lease, &leases, head) {
81 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + lease->duid_len);
83 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
88 a->clid_len = lease->duid_len;
91 a->assigned = lease->hostid;
93 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
94 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
96 odhcpd_urandom(a->key, sizeof(a->key));
97 memcpy(a->clid_data, lease->duid, a->clid_len);
98 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
100 // Assign to all interfaces
101 struct dhcpv6_assignment *c;
102 list_for_each_entry(c, &iface->ia_assignments, head) {
103 if (c->length != 128 || c->assigned > a->assigned) {
104 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(socket_fd, &assign->peer, &iov, 1, iface);
190 void dhcpv6_write_statefile(void)
192 if (config.dhcp_statefile) {
193 time_t now = odhcpd_time(), wall_time = time(NULL);
194 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
198 lockf(fd, F_LOCK, 0);
201 FILE *fp = fdopen(fd, "w");
207 struct interface *iface;
208 list_for_each_entry(iface, &interfaces, head) {
209 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
212 if (iface->dhcpv6 == RELAYD_SERVER) {
213 struct dhcpv6_assignment *c;
214 list_for_each_entry(c, &iface->ia_assignments, head) {
215 if (c->clid_len == 0)
218 char ipbuf[INET6_ADDRSTRLEN];
221 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
223 // iface DUID iaid hostname lifetime assigned length [addrs...]
224 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %u %x %u ",
225 iface->ifname, duidbuf, ntohl(c->iaid),
226 (c->hostname ? c->hostname : "-"),
227 (unsigned)(c->valid_until > now ?
228 (c->valid_until - now + wall_time) : 0),
229 c->assigned, (unsigned)c->length);
231 struct in6_addr addr;
232 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
233 if (iface->ia_addr[i].prefix > 64)
236 addr = iface->ia_addr[i].addr;
237 if (c->length == 128)
238 addr.s6_addr32[3] = htonl(c->assigned);
240 addr.s6_addr32[1] |= htonl(c->assigned);
241 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
243 if (c->length == 128 && c->hostname && i == 0)
244 fprintf(fp, "%s\t%s\n", ipbuf, c->hostname);
246 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%hhu ", ipbuf, c->length);
248 leasebuf[l - 1] = '\n';
249 fwrite(leasebuf, 1, l, fp);
253 if (iface->dhcpv4 == RELAYD_SERVER) {
254 struct dhcpv4_assignment *c;
255 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
256 char ipbuf[INET6_ADDRSTRLEN];
259 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
261 // iface DUID iaid hostname lifetime assigned length [addrs...]
262 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %u %x 32 ",
263 iface->ifname, duidbuf,
264 (c->hostname ? c->hostname : "-"),
265 (unsigned)(c->valid_until > now ?
266 (c->valid_until - now + wall_time) : 0),
269 struct in_addr addr = {htonl(c->addr)};
270 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
273 fprintf(fp, "%s\t%s\n", ipbuf, c->hostname);
275 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
276 leasebuf[l - 1] = '\n';
277 fwrite(leasebuf, 1, l, fp);
285 if (config.dhcp_cb) {
286 char *argv[2] = {config.dhcp_cb, NULL};
288 execv(argv[0], argv);
295 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
300 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
301 struct in6_addr prefix = iface->ia_addr[i].addr;
302 prefix.s6_addr32[1] |= htonl(a->assigned);
303 odhcpd_setup_route(&prefix, a->length, iface, &a->peer.sin6_addr, add);
308 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
310 struct dhcpv6_assignment *c;
311 if (iface->ia_addr_len < 1)
314 // Try honoring the hint first
315 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
316 if (assign->assigned) {
317 list_for_each_entry(c, &iface->ia_assignments, head) {
318 if (c->length == 128)
321 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
322 list_add_tail(&assign->head, &c->head);
323 apply_lease(iface, assign, true);
327 if (c->assigned != 0)
328 current = (c->assigned + (1 << (64 - c->length)));
332 // Fallback to a variable assignment
334 list_for_each_entry(c, &iface->ia_assignments, head) {
335 if (c->length == 128)
338 current = (current + asize) & (~asize);
339 if (current + asize < c->assigned) {
340 assign->assigned = current;
341 list_add_tail(&assign->head, &c->head);
342 apply_lease(iface, assign, true);
346 if (c->assigned != 0)
347 current = (c->assigned + (1 << (64 - c->length)));
354 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
357 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
358 if (!iface->ia_addr[i].has_class) {
361 } else if (assign->classes_cnt) {
362 for (size_t j = 0; j < assign->classes_cnt; ++j)
363 if (assign->classes[j] == iface->ia_addr[i].class)
365 } else if (assign->all_class) {
373 // Seed RNG with checksum of DUID
375 for (size_t i = 0; i < assign->clid_len; ++i)
376 seed += assign->clid_data[i];
379 // Try to assign up to 100x
380 for (size_t i = 0; i < 100; ++i) {
382 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
384 struct dhcpv6_assignment *c;
385 list_for_each_entry(c, &iface->ia_assignments, head) {
386 if (c->assigned > try || c->length != 128) {
387 assign->assigned = try;
388 list_add_tail(&assign->head, &c->head);
390 } else if (c->assigned == try) {
400 static int prefixcmp(const void *va, const void *vb)
402 const struct odhcpd_ipaddr *a = va, *b = vb;
403 uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1;
404 uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1;
405 return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
409 static void update(struct interface *iface)
411 struct odhcpd_ipaddr addr[8];
412 memset(addr, 0, sizeof(addr));
413 int len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8);
418 qsort(addr, len, sizeof(*addr), prefixcmp);
420 time_t now = odhcpd_time();
423 for (int i = 0; i < len; ++i) {
424 if (addr[i].prefix > minprefix)
425 minprefix = addr[i].prefix;
427 addr[i].addr.s6_addr32[2] = 0;
428 addr[i].addr.s6_addr32[3] = 0;
430 if (addr[i].preferred < UINT32_MAX - now)
431 addr[i].preferred += now;
433 if (addr[i].valid < UINT32_MAX - now)
434 addr[i].valid += now;
437 struct dhcpv6_assignment *border = list_last_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
438 border->assigned = 1 << (64 - minprefix);
440 bool change = len != (int)iface->ia_addr_len;
441 for (int i = 0; !change && i < len; ++i)
442 if (addr[i].addr.s6_addr32[0] != iface->ia_addr[i].addr.s6_addr32[0] ||
443 addr[i].addr.s6_addr32[1] != iface->ia_addr[i].addr.s6_addr32[1] ||
444 (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) ||
445 (addr[i].valid > (uint32_t)now + 7200) !=
446 (iface->ia_addr[i].valid > (uint32_t)now + 7200))
450 struct dhcpv6_assignment *c;
451 list_for_each_entry(c, &iface->ia_assignments, head)
453 apply_lease(iface, c, false);
456 memcpy(iface->ia_addr, addr, len * sizeof(*addr));
457 iface->ia_addr_len = len;
459 if (change) { // Addresses / prefixes have changed
460 struct list_head reassign = LIST_HEAD_INIT(reassign);
461 struct dhcpv6_assignment *c, *d;
462 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
463 if (c->clid_len == 0 || c->valid_until < now)
466 if (c->length < 128 && c->assigned >= border->assigned && c != border)
467 list_move(&c->head, &reassign);
468 else if (c != border)
469 apply_lease(iface, c, true);
471 if (c->accept_reconf && c->reconf_cnt == 0) {
473 c->reconf_sent = now;
474 send_reconf(iface, c);
476 // Leave all other assignments of that client alone
477 struct dhcpv6_assignment *a;
478 list_for_each_entry(a, &iface->ia_assignments, head)
479 if (a != c && a->clid_len == c->clid_len &&
480 !memcmp(a->clid_data, c->clid_data, a->clid_len))
481 c->reconf_cnt = INT_MAX;
485 while (!list_empty(&reassign)) {
486 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
488 if (!assign_pd(iface, c)) {
490 list_add(&c->head, &iface->ia_assignments);
494 dhcpv6_write_statefile();
499 static void reconf_timer(struct uloop_timeout *event)
501 time_t now = odhcpd_time();
502 struct interface *iface;
503 list_for_each_entry(iface, &interfaces, head) {
504 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
507 struct dhcpv6_assignment *a, *n;
508 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
509 if (a->valid_until < now) {
510 if ((a->length < 128 && a->clid_len > 0) ||
511 (a->length == 128 && a->clid_len == 0)) {
517 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
518 now > a->reconf_sent + (1 << a->reconf_cnt)) {
520 a->reconf_sent = now;
521 send_reconf(iface, a);
525 if (iface->ia_reconf) {
527 iface->ia_reconf = false;
531 uloop_timeout_set(event, 2000);
535 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
536 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
537 struct interface *iface, bool request)
539 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
542 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
543 size_t datalen = sizeof(out);
544 time_t now = odhcpd_time();
547 struct __attribute__((packed)) {
551 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
554 memcpy(buf + datalen, &stat, sizeof(stat));
555 datalen += sizeof(stat);
558 uint32_t pref = 3600;
559 uint32_t valid = 3600;
561 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
563 if (iface->ia_addr[i].has_class) {
565 if (a->classes_cnt) {
566 for (size_t j = 0; j < a->classes_cnt; ++j)
567 if (a->classes[j] == iface->ia_addr[i].class)
569 } else if (a->all_class) {
577 uint32_t prefix_pref = iface->ia_addr[i].preferred - now;
578 uint32_t prefix_valid = iface->ia_addr[i].valid - now;
580 if (iface->ia_addr[i].prefix > 64 ||
581 iface->ia_addr[i].preferred <= (uint32_t)now)
584 if (prefix_pref > 86400)
587 if (prefix_valid > 86400)
588 prefix_valid = 86400;
590 #ifdef DHCPV6_OPT_PREFIX_CLASS
595 } pclass = {htons(DHCPV6_OPT_PREFIX_CLASS),
596 htons(2), htons(iface->ia_addr[i].class)};
599 if (a->length < 128) {
600 struct dhcpv6_ia_prefix p = {
601 .type = htons(DHCPV6_OPT_IA_PREFIX),
602 .len = htons(sizeof(p) - 4),
603 .preferred = htonl(prefix_pref),
604 .valid = htonl(prefix_valid),
606 .addr = iface->ia_addr[i].addr
608 p.addr.s6_addr32[1] |= htonl(a->assigned);
609 size_t entrlen = sizeof(p) - 4;
611 #ifdef DHCPV6_OPT_PREFIX_CLASS
612 if (iface->ia_addr[i].has_class) {
613 entrlen += sizeof(pclass);
614 p.len = htons(entrlen);
618 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
621 memcpy(buf + datalen, &p, sizeof(p));
622 #ifdef DHCPV6_OPT_PREFIX_CLASS
623 memcpy(buf + datalen + sizeof(p), &pclass, sizeof(pclass));
625 datalen += entrlen + 4;
627 struct dhcpv6_ia_addr n = {
628 .type = htons(DHCPV6_OPT_IA_ADDR),
629 .len = htons(sizeof(n) - 4),
630 .addr = iface->ia_addr[i].addr,
631 .preferred = htonl(prefix_pref),
632 .valid = htonl(prefix_valid)
634 n.addr.s6_addr32[3] = htonl(a->assigned);
635 size_t entrlen = sizeof(n) - 4;
637 #ifdef DHCPV6_OPT_PREFIX_CLASS
638 if (iface->ia_addr[i].has_class) {
639 entrlen += sizeof(pclass);
640 n.len = htons(entrlen);
644 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
647 memcpy(buf + datalen, &n, sizeof(n));
648 #ifdef DHCPV6_OPT_PREFIX_CLASS
649 memcpy(buf + datalen + sizeof(n), &pclass, sizeof(pclass));
651 datalen += entrlen + 4;
654 // Calculate T1 / T2 based on non-deprecated addresses
655 if (prefix_pref > 0) {
656 if (prefix_pref < pref)
659 if (prefix_valid < valid)
660 valid = prefix_valid;
664 a->valid_until = valid + now;
665 out.t1 = htonl(pref * 5 / 10);
666 out.t2 = htonl(pref * 8 / 10);
676 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
677 uint16_t otype, olen;
678 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
679 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
680 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
681 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
682 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
687 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
688 if (iface->ia_addr[i].prefix > 64 ||
689 iface->ia_addr[i].preferred <= (uint32_t)now)
692 struct in6_addr addr = iface->ia_addr[i].addr;
693 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
694 addr.s6_addr32[1] |= htonl(a->assigned);
696 if (IN6_ARE_ADDR_EQUAL(&p->addr, &addr) &&
697 p->prefix == a->length)
700 addr.s6_addr32[3] = htonl(a->assigned);
702 if (IN6_ARE_ADDR_EQUAL(&n->addr, &addr))
709 if (otype == DHCPV6_OPT_IA_PREFIX) {
710 struct dhcpv6_ia_prefix inv = {
711 .type = htons(DHCPV6_OPT_IA_PREFIX),
712 .len = htons(sizeof(inv) - 4),
719 if (datalen + sizeof(inv) > buflen)
722 memcpy(buf + datalen, &inv, sizeof(inv));
723 datalen += sizeof(inv);
725 struct dhcpv6_ia_addr inv = {
726 .type = htons(DHCPV6_OPT_IA_ADDR),
727 .len = htons(sizeof(inv) - 4),
733 if (datalen + sizeof(inv) > buflen)
736 memcpy(buf + datalen, &inv, sizeof(inv));
737 datalen += sizeof(inv);
744 out.len = htons(datalen - 4);
745 memcpy(buf, &out, sizeof(out));
750 size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
751 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
753 time_t now = odhcpd_time();
754 size_t response_len = 0;
755 const struct dhcpv6_client_header *hdr = data;
756 uint8_t *start = (uint8_t*)&hdr[1], *odata;
757 uint16_t otype, olen;
759 // Find and parse client-id and hostname
760 bool accept_reconf = false;
761 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
763 size_t hostname_len = 0;
764 bool class_oro = false;
765 dhcpv6_for_each_option(start, end, otype, olen, odata) {
766 if (otype == DHCPV6_OPT_CLIENTID) {
770 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
771 memcpy(mac, &odata[8], sizeof(mac));
772 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
773 memcpy(mac, &odata[4], sizeof(mac));
774 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
775 uint8_t fqdn_buf[256];
776 memcpy(fqdn_buf, odata, olen);
777 fqdn_buf[olen++] = 0;
779 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
780 hostname_len = strcspn(hostname, ".");
781 } else if (otype == DHCPV6_OPT_ORO) {
782 #ifdef DHCPV6_OPT_PREFIX_CLASS
783 for (size_t i = 0; i + 1 < olen; i += 2) {
784 if (odata[i] == (DHCPV6_OPT_PREFIX_CLASS >> 8) &&
785 odata[i + 1] == (DHCPV6_OPT_PREFIX_CLASS & 0xff))
789 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
790 accept_reconf = true;
794 if (!clid_data || !clid_len || clid_len > 130)
798 bool update_state = false;
800 struct dhcpv6_assignment *first = NULL;
801 dhcpv6_for_each_option(start, end, otype, olen, odata) {
802 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
803 bool is_na = (otype == DHCPV6_OPT_IA_NA);
804 if (!is_pd && !is_na)
807 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
808 size_t ia_response_len = 0;
809 uint8_t reqlen = (is_pd) ? 62 : 128;
810 uint32_t reqhint = 0;
812 const uint8_t classes_max = 32;
813 uint8_t classes_cnt = 0;
814 uint16_t classes[classes_max];
816 // Parse request hint for IA-PD
819 uint16_t stype, slen;
820 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
821 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
824 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
827 reqhint = ntohl(p->addr.s6_addr32[1]);
828 if (reqlen > 32 && reqlen <= 64)
829 reqhint &= (1U << (64 - reqlen)) - 1;
832 #ifdef DHCPV6_OPT_PREFIX_CLASS
834 uint16_t xtype, xlen;
835 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
836 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
839 if (classes_cnt >= classes_max)
842 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
851 uint16_t stype, slen;
852 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
853 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
856 #ifdef DHCPV6_OPT_PREFIX_CLASS
858 uint16_t xtype, xlen;
859 struct dhcpv6_ia_addr *p = (struct dhcpv6_ia_addr*)&sdata[-4];
860 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
861 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
864 if (classes_cnt >= classes_max)
867 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
874 struct dhcpv6_assignment *c, *a = NULL;
875 list_for_each_entry(c, &iface->ia_assignments, head) {
876 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
877 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
878 && !memcmp(c->mac, mac, sizeof(mac)))) &&
879 (c->iaid == ia->iaid || c->valid_until < now) &&
880 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
884 apply_lease(iface, a, false);
885 memcpy(a->clid_data, clid_data, clid_len);
886 a->clid_len = clid_len;
891 a->all_class = class_oro;
892 a->classes_cnt = classes_cnt;
893 a->classes = realloc(a->classes, classes_cnt * sizeof(uint16_t));
895 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
900 // Generic message handling
901 uint16_t status = DHCPV6_STATUS_OK;
902 if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
905 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
906 a = calloc(1, sizeof(*a) + clid_len);
908 a->clid_len = clid_len;
912 a->assigned = reqhint;
913 a->all_class = class_oro;
914 a->classes_cnt = classes_cnt;
916 a->classes = malloc(classes_cnt * sizeof(uint16_t));
918 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
922 memcpy(a->key, first->key, sizeof(a->key));
924 odhcpd_urandom(a->key, sizeof(a->key));
925 memcpy(a->clid_data, clid_data, clid_len);
928 while (!(assigned = assign_pd(iface, a)) && ++a->length <= 64);
930 assigned = assign_na(iface, a);
934 if (!assigned || iface->ia_addr_len == 0) { // Set error status
935 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
936 } else if (assigned && !first) { //
937 size_t handshake_len = 4;
939 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
943 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
944 struct dhcpv6_auth_reconfigure auth = {
945 htons(DHCPV6_OPT_AUTH),
946 htons(sizeof(auth) - 4),
948 {htonl(time(NULL)), htonl(++serial)},
952 memcpy(auth.key, a->key, sizeof(a->key));
953 memcpy(buf + handshake_len, &auth, sizeof(auth));
954 handshake_len += sizeof(auth);
957 buf += handshake_len;
958 buflen -= handshake_len;
959 response_len += handshake_len;
964 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
966 // Was only a solicitation: mark binding for removal
967 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
969 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
970 if (hostname_len > 0) {
971 a->hostname = realloc(a->hostname, hostname_len + 1);
973 memcpy(a->hostname, hostname, hostname_len);
974 a->hostname[hostname_len] = 0;
977 a->accept_reconf = accept_reconf;
978 apply_lease(iface, a, true);
980 } else if (!assigned && a) { // Cleanup failed assignment
985 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
986 hdr->msg_type == DHCPV6_MSG_RELEASE ||
987 hdr->msg_type == DHCPV6_MSG_REBIND ||
988 hdr->msg_type == DHCPV6_MSG_DECLINE) {
989 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
990 status = DHCPV6_STATUS_NOBINDING;
991 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
992 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
993 hdr->msg_type == DHCPV6_MSG_REBIND) {
994 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
996 apply_lease(iface, a, true);
997 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
999 apply_lease(iface, a, false);
1000 update_state = true;
1001 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1003 a->valid_until = now + 3600; // Block address for 1h
1004 update_state = true;
1006 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1007 // Always send NOTONLINK for CONFIRM so that clients restart connection
1008 status = DHCPV6_STATUS_NOTONLINK;
1009 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1012 buf += ia_response_len;
1013 buflen -= ia_response_len;
1014 response_len += ia_response_len;
1017 if (hdr->msg_type == DHCPV6_MSG_RELEASE && response_len + 6 < buflen) {
1019 buf[1] = DHCPV6_OPT_STATUS;
1023 buf[5] = DHCPV6_STATUS_OK;
1028 dhcpv6_write_statefile();
1031 return response_len;