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);
104 } else if (c->assigned == a->assigned) {
105 // Already an assignment with that number
111 if (lease->hostname[0]) {
113 a->hostname = strdup(lease->hostname);
126 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
129 struct dhcpv6_client_header hdr;
133 uint16_t hardware_type;
138 struct dhcpv6_auth_reconfigure auth;
141 uint8_t clid_data[128];
142 } __attribute__((packed)) reconf_msg = {
143 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
144 .srvid_type = htons(DHCPV6_OPT_SERVERID),
145 .srvid_len = htons(10),
146 .duid_type = htons(3),
147 .hardware_type = htons(1),
148 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
150 .msg_id = DHCPV6_MSG_RENEW,
151 .auth = {htons(DHCPV6_OPT_AUTH),
152 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
153 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
154 .clid_type = htons(DHCPV6_OPT_CLIENTID),
155 .clid_len = htons(assign->clid_len),
159 odhcpd_get_mac(iface, reconf_msg.mac);
160 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
161 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
164 uint8_t secretbytes[16];
165 memcpy(secretbytes, assign->key, sizeof(secretbytes));
167 for (size_t i = 0; i < sizeof(secretbytes); ++i)
168 secretbytes[i] ^= 0x36;
171 md5_hash(secretbytes, sizeof(secretbytes), &md5);
172 md5_hash(iov.iov_base, iov.iov_len, &md5);
173 md5_end(reconf_msg.auth.key, &md5);
175 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
176 secretbytes[i] ^= 0x36;
177 secretbytes[i] ^= 0x5c;
181 md5_hash(secretbytes, sizeof(secretbytes), &md5);
182 md5_hash(reconf_msg.auth.key, 16, &md5);
183 md5_end(reconf_msg.auth.key, &md5);
185 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
189 void dhcpv6_write_statefile(void)
194 if (config.dhcp_statefile) {
195 time_t now = odhcpd_time(), wall_time = time(NULL);
196 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
200 lockf(fd, F_LOCK, 0);
203 FILE *fp = fdopen(fd, "w");
209 struct interface *iface;
210 list_for_each_entry(iface, &interfaces, head) {
211 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
214 if (iface->dhcpv6 == RELAYD_SERVER) {
215 struct dhcpv6_assignment *c;
216 list_for_each_entry(c, &iface->ia_assignments, head) {
217 if (c->clid_len == 0)
220 char ipbuf[INET6_ADDRSTRLEN];
223 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
225 // iface DUID iaid hostname lifetime assigned length [addrs...]
226 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %u %x %u ",
227 iface->ifname, duidbuf, ntohl(c->iaid),
228 (c->hostname ? c->hostname : "-"),
229 (unsigned)(c->valid_until > now ?
230 (c->valid_until - now + wall_time) : 0),
231 c->assigned, (unsigned)c->length);
233 struct in6_addr addr;
234 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
235 if (iface->ia_addr[i].prefix > 64)
238 addr = iface->ia_addr[i].addr;
239 if (c->length == 128)
240 addr.s6_addr32[3] = htonl(c->assigned);
242 addr.s6_addr32[1] |= htonl(c->assigned);
243 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
245 if (c->length == 128 && c->hostname && i == 0) {
246 fprintf(fp, "%s\t%s\n", ipbuf, c->hostname);
247 md5_hash(ipbuf, strlen(ipbuf), &md5);
248 md5_hash(c->hostname, strlen(c->hostname), &md5);
251 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%hhu ", ipbuf, c->length);
253 leasebuf[l - 1] = '\n';
254 fwrite(leasebuf, 1, l, fp);
258 if (iface->dhcpv4 == RELAYD_SERVER) {
259 struct dhcpv4_assignment *c;
260 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
261 char ipbuf[INET6_ADDRSTRLEN];
264 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
266 // iface DUID iaid hostname lifetime assigned length [addrs...]
267 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %u %x 32 ",
268 iface->ifname, duidbuf,
269 (c->hostname ? c->hostname : "-"),
270 (unsigned)(c->valid_until > now ?
271 (c->valid_until - now + wall_time) : 0),
274 struct in_addr addr = {htonl(c->addr)};
275 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
277 if (c->hostname[0]) {
278 fprintf(fp, "%s\t%s\n", ipbuf, c->hostname);
279 md5_hash(ipbuf, strlen(ipbuf), &md5);
280 md5_hash(c->hostname, strlen(c->hostname), &md5);
283 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
284 leasebuf[l - 1] = '\n';
285 fwrite(leasebuf, 1, l, fp);
294 md5_end(newmd5, &md5);
296 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
297 memcpy(statemd5, newmd5, sizeof(statemd5));
298 char *argv[2] = {config.dhcp_cb, NULL};
300 execv(argv[0], argv);
307 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
312 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
313 struct in6_addr prefix = iface->ia_addr[i].addr;
314 prefix.s6_addr32[1] |= htonl(a->assigned);
315 odhcpd_setup_route(&prefix, a->length, iface, &a->peer.sin6_addr, add);
320 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
322 struct dhcpv6_assignment *c;
323 if (iface->ia_addr_len < 1)
326 // Try honoring the hint first
327 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
328 if (assign->assigned) {
329 list_for_each_entry(c, &iface->ia_assignments, head) {
330 if (c->length == 128)
333 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
334 list_add_tail(&assign->head, &c->head);
335 apply_lease(iface, assign, true);
339 if (c->assigned != 0)
340 current = (c->assigned + (1 << (64 - c->length)));
344 // Fallback to a variable assignment
346 list_for_each_entry(c, &iface->ia_assignments, head) {
347 if (c->length == 128)
350 current = (current + asize) & (~asize);
351 if (current + asize < c->assigned) {
352 assign->assigned = current;
353 list_add_tail(&assign->head, &c->head);
354 apply_lease(iface, assign, true);
358 if (c->assigned != 0)
359 current = (c->assigned + (1 << (64 - c->length)));
366 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
369 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
370 if (!iface->ia_addr[i].has_class) {
373 } else if (assign->classes_cnt) {
374 for (size_t j = 0; j < assign->classes_cnt; ++j)
375 if (assign->classes[j] == iface->ia_addr[i].class)
377 } else if (assign->all_class) {
385 // Seed RNG with checksum of DUID
387 for (size_t i = 0; i < assign->clid_len; ++i)
388 seed += assign->clid_data[i];
391 // Try to assign up to 100x
392 for (size_t i = 0; i < 100; ++i) {
394 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
396 struct dhcpv6_assignment *c;
397 list_for_each_entry(c, &iface->ia_assignments, head) {
398 if (c->assigned > try || c->length != 128) {
399 assign->assigned = try;
400 list_add_tail(&assign->head, &c->head);
402 } else if (c->assigned == try) {
412 static int prefixcmp(const void *va, const void *vb)
414 const struct odhcpd_ipaddr *a = va, *b = vb;
415 uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1;
416 uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1;
417 return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
421 static void update(struct interface *iface)
423 struct odhcpd_ipaddr addr[8];
424 memset(addr, 0, sizeof(addr));
425 int len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8);
430 qsort(addr, len, sizeof(*addr), prefixcmp);
432 time_t now = odhcpd_time();
435 for (int i = 0; i < len; ++i) {
436 if (addr[i].prefix > minprefix)
437 minprefix = addr[i].prefix;
439 addr[i].addr.s6_addr32[2] = 0;
440 addr[i].addr.s6_addr32[3] = 0;
442 if (addr[i].preferred < UINT32_MAX - now)
443 addr[i].preferred += now;
445 if (addr[i].valid < UINT32_MAX - now)
446 addr[i].valid += now;
449 struct dhcpv6_assignment *border = list_last_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
450 border->assigned = 1 << (64 - minprefix);
452 bool change = len != (int)iface->ia_addr_len;
453 for (int i = 0; !change && i < len; ++i)
454 if (addr[i].addr.s6_addr32[0] != iface->ia_addr[i].addr.s6_addr32[0] ||
455 addr[i].addr.s6_addr32[1] != iface->ia_addr[i].addr.s6_addr32[1] ||
456 (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) ||
457 (addr[i].valid > (uint32_t)now + 7200) !=
458 (iface->ia_addr[i].valid > (uint32_t)now + 7200))
462 struct dhcpv6_assignment *c;
463 list_for_each_entry(c, &iface->ia_assignments, head)
465 apply_lease(iface, c, false);
468 memcpy(iface->ia_addr, addr, len * sizeof(*addr));
469 iface->ia_addr_len = len;
471 if (change) { // Addresses / prefixes have changed
472 struct list_head reassign = LIST_HEAD_INIT(reassign);
473 struct dhcpv6_assignment *c, *d;
474 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
475 if (c->clid_len == 0 || c->valid_until < now)
478 if (c->length < 128 && c->assigned >= border->assigned && c != border)
479 list_move(&c->head, &reassign);
480 else if (c != border)
481 apply_lease(iface, c, true);
483 if (c->accept_reconf && c->reconf_cnt == 0) {
485 c->reconf_sent = now;
486 send_reconf(iface, c);
488 // Leave all other assignments of that client alone
489 struct dhcpv6_assignment *a;
490 list_for_each_entry(a, &iface->ia_assignments, head)
491 if (a != c && a->clid_len == c->clid_len &&
492 !memcmp(a->clid_data, c->clid_data, a->clid_len))
493 c->reconf_cnt = INT_MAX;
497 while (!list_empty(&reassign)) {
498 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
500 if (!assign_pd(iface, c)) {
502 list_add(&c->head, &iface->ia_assignments);
506 dhcpv6_write_statefile();
511 static void reconf_timer(struct uloop_timeout *event)
513 time_t now = odhcpd_time();
514 struct interface *iface;
515 list_for_each_entry(iface, &interfaces, head) {
516 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
519 struct dhcpv6_assignment *a, *n;
520 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
521 if (a->valid_until < now) {
522 if ((a->length < 128 && a->clid_len > 0) ||
523 (a->length == 128 && a->clid_len == 0)) {
529 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
530 now > a->reconf_sent + (1 << a->reconf_cnt)) {
532 a->reconf_sent = now;
533 send_reconf(iface, a);
537 if (iface->ia_reconf) {
539 iface->ia_reconf = false;
543 uloop_timeout_set(event, 2000);
547 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
548 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
549 struct interface *iface, bool request)
551 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
554 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
555 size_t datalen = sizeof(out);
556 time_t now = odhcpd_time();
559 struct __attribute__((packed)) {
563 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
566 memcpy(buf + datalen, &stat, sizeof(stat));
567 datalen += sizeof(stat);
570 uint32_t pref = 3600;
571 uint32_t valid = 3600;
573 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
575 if (iface->ia_addr[i].has_class) {
577 if (a->classes_cnt) {
578 for (size_t j = 0; j < a->classes_cnt; ++j)
579 if (a->classes[j] == iface->ia_addr[i].class)
581 } else if (a->all_class) {
589 uint32_t prefix_pref = iface->ia_addr[i].preferred - now;
590 uint32_t prefix_valid = iface->ia_addr[i].valid - now;
592 if (iface->ia_addr[i].prefix > 64 ||
593 iface->ia_addr[i].preferred <= (uint32_t)now)
596 if (prefix_pref > 86400)
599 if (prefix_valid > 86400)
600 prefix_valid = 86400;
602 #ifdef DHCPV6_OPT_PREFIX_CLASS
607 } pclass = {htons(DHCPV6_OPT_PREFIX_CLASS),
608 htons(2), htons(iface->ia_addr[i].class)};
611 if (a->length < 128) {
612 struct dhcpv6_ia_prefix p = {
613 .type = htons(DHCPV6_OPT_IA_PREFIX),
614 .len = htons(sizeof(p) - 4),
615 .preferred = htonl(prefix_pref),
616 .valid = htonl(prefix_valid),
618 .addr = iface->ia_addr[i].addr
620 p.addr.s6_addr32[1] |= htonl(a->assigned);
621 size_t entrlen = sizeof(p) - 4;
623 #ifdef DHCPV6_OPT_PREFIX_CLASS
624 if (iface->ia_addr[i].has_class) {
625 entrlen += sizeof(pclass);
626 p.len = htons(entrlen);
630 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
633 memcpy(buf + datalen, &p, sizeof(p));
634 #ifdef DHCPV6_OPT_PREFIX_CLASS
635 memcpy(buf + datalen + sizeof(p), &pclass, sizeof(pclass));
637 datalen += entrlen + 4;
639 struct dhcpv6_ia_addr n = {
640 .type = htons(DHCPV6_OPT_IA_ADDR),
641 .len = htons(sizeof(n) - 4),
642 .addr = iface->ia_addr[i].addr,
643 .preferred = htonl(prefix_pref),
644 .valid = htonl(prefix_valid)
646 n.addr.s6_addr32[3] = htonl(a->assigned);
647 size_t entrlen = sizeof(n) - 4;
649 #ifdef DHCPV6_OPT_PREFIX_CLASS
650 if (iface->ia_addr[i].has_class) {
651 entrlen += sizeof(pclass);
652 n.len = htons(entrlen);
656 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
659 memcpy(buf + datalen, &n, sizeof(n));
660 #ifdef DHCPV6_OPT_PREFIX_CLASS
661 memcpy(buf + datalen + sizeof(n), &pclass, sizeof(pclass));
663 datalen += entrlen + 4;
666 // Calculate T1 / T2 based on non-deprecated addresses
667 if (prefix_pref > 0) {
668 if (prefix_pref < pref)
671 if (prefix_valid < valid)
672 valid = prefix_valid;
676 a->valid_until = valid + now;
677 out.t1 = htonl(pref * 5 / 10);
678 out.t2 = htonl(pref * 8 / 10);
688 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
689 uint16_t otype, olen;
690 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
691 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
692 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
693 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
694 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
699 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
700 if (iface->ia_addr[i].prefix > 64 ||
701 iface->ia_addr[i].preferred <= (uint32_t)now)
704 struct in6_addr addr = iface->ia_addr[i].addr;
705 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
706 addr.s6_addr32[1] |= htonl(a->assigned);
708 if (IN6_ARE_ADDR_EQUAL(&p->addr, &addr) &&
709 p->prefix == a->length)
712 addr.s6_addr32[3] = htonl(a->assigned);
714 if (IN6_ARE_ADDR_EQUAL(&n->addr, &addr))
721 if (otype == DHCPV6_OPT_IA_PREFIX) {
722 struct dhcpv6_ia_prefix inv = {
723 .type = htons(DHCPV6_OPT_IA_PREFIX),
724 .len = htons(sizeof(inv) - 4),
731 if (datalen + sizeof(inv) > buflen)
734 memcpy(buf + datalen, &inv, sizeof(inv));
735 datalen += sizeof(inv);
737 struct dhcpv6_ia_addr inv = {
738 .type = htons(DHCPV6_OPT_IA_ADDR),
739 .len = htons(sizeof(inv) - 4),
745 if (datalen + sizeof(inv) > buflen)
748 memcpy(buf + datalen, &inv, sizeof(inv));
749 datalen += sizeof(inv);
756 out.len = htons(datalen - 4);
757 memcpy(buf, &out, sizeof(out));
762 size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
763 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
765 time_t now = odhcpd_time();
766 size_t response_len = 0;
767 const struct dhcpv6_client_header *hdr = data;
768 uint8_t *start = (uint8_t*)&hdr[1], *odata;
769 uint16_t otype, olen;
771 // Find and parse client-id and hostname
772 bool accept_reconf = false;
773 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
775 size_t hostname_len = 0;
776 bool class_oro = false;
777 dhcpv6_for_each_option(start, end, otype, olen, odata) {
778 if (otype == DHCPV6_OPT_CLIENTID) {
782 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
783 memcpy(mac, &odata[8], sizeof(mac));
784 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
785 memcpy(mac, &odata[4], sizeof(mac));
786 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
787 uint8_t fqdn_buf[256];
788 memcpy(fqdn_buf, odata, olen);
789 fqdn_buf[olen++] = 0;
791 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
792 hostname_len = strcspn(hostname, ".");
793 } else if (otype == DHCPV6_OPT_ORO) {
794 #ifdef DHCPV6_OPT_PREFIX_CLASS
795 for (size_t i = 0; i + 1 < olen; i += 2) {
796 if (odata[i] == (DHCPV6_OPT_PREFIX_CLASS >> 8) &&
797 odata[i + 1] == (DHCPV6_OPT_PREFIX_CLASS & 0xff))
801 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
802 accept_reconf = true;
806 if (!clid_data || !clid_len || clid_len > 130)
810 bool update_state = false;
812 struct dhcpv6_assignment *first = NULL;
813 dhcpv6_for_each_option(start, end, otype, olen, odata) {
814 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
815 bool is_na = (otype == DHCPV6_OPT_IA_NA);
816 if (!is_pd && !is_na)
819 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
820 size_t ia_response_len = 0;
821 uint8_t reqlen = (is_pd) ? 62 : 128;
822 uint32_t reqhint = 0;
824 const uint8_t classes_max = 32;
825 uint8_t classes_cnt = 0;
826 uint16_t classes[classes_max];
828 // Parse request hint for IA-PD
831 uint16_t stype, slen;
832 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
833 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
836 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
839 reqhint = ntohl(p->addr.s6_addr32[1]);
840 if (reqlen > 32 && reqlen <= 64)
841 reqhint &= (1U << (64 - reqlen)) - 1;
844 #ifdef DHCPV6_OPT_PREFIX_CLASS
846 uint16_t xtype, xlen;
847 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
848 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
851 if (classes_cnt >= classes_max)
854 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
863 uint16_t stype, slen;
864 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
865 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
868 #ifdef DHCPV6_OPT_PREFIX_CLASS
870 uint16_t xtype, xlen;
871 struct dhcpv6_ia_addr *p = (struct dhcpv6_ia_addr*)&sdata[-4];
872 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
873 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
876 if (classes_cnt >= classes_max)
879 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
886 struct dhcpv6_assignment *c, *a = NULL;
887 list_for_each_entry(c, &iface->ia_assignments, head) {
888 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
889 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
890 && !memcmp(c->mac, mac, sizeof(mac)))) &&
891 (c->iaid == ia->iaid || c->valid_until < now) &&
892 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
896 apply_lease(iface, a, false);
897 memcpy(a->clid_data, clid_data, clid_len);
898 a->clid_len = clid_len;
903 a->all_class = class_oro;
904 a->classes_cnt = classes_cnt;
905 a->classes = realloc(a->classes, classes_cnt * sizeof(uint16_t));
907 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
912 // Generic message handling
913 uint16_t status = DHCPV6_STATUS_OK;
914 if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
917 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
918 a = calloc(1, sizeof(*a) + clid_len);
920 a->clid_len = clid_len;
924 a->assigned = reqhint;
925 a->all_class = class_oro;
926 a->classes_cnt = classes_cnt;
928 a->classes = malloc(classes_cnt * sizeof(uint16_t));
930 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
934 memcpy(a->key, first->key, sizeof(a->key));
936 odhcpd_urandom(a->key, sizeof(a->key));
937 memcpy(a->clid_data, clid_data, clid_len);
940 while (!(assigned = assign_pd(iface, a)) && ++a->length <= 64);
942 assigned = assign_na(iface, a);
946 if (!assigned || iface->ia_addr_len == 0) { // Set error status
947 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
948 } else if (assigned && !first) { //
949 size_t handshake_len = 4;
951 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
955 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
956 struct dhcpv6_auth_reconfigure auth = {
957 htons(DHCPV6_OPT_AUTH),
958 htons(sizeof(auth) - 4),
960 {htonl(time(NULL)), htonl(++serial)},
964 memcpy(auth.key, a->key, sizeof(a->key));
965 memcpy(buf + handshake_len, &auth, sizeof(auth));
966 handshake_len += sizeof(auth);
969 buf += handshake_len;
970 buflen -= handshake_len;
971 response_len += handshake_len;
976 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
978 // Was only a solicitation: mark binding for removal
979 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
981 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
982 if (hostname_len > 0) {
983 a->hostname = realloc(a->hostname, hostname_len + 1);
985 memcpy(a->hostname, hostname, hostname_len);
986 a->hostname[hostname_len] = 0;
989 a->accept_reconf = accept_reconf;
990 apply_lease(iface, a, true);
992 } else if (!assigned && a) { // Cleanup failed assignment
997 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
998 hdr->msg_type == DHCPV6_MSG_RELEASE ||
999 hdr->msg_type == DHCPV6_MSG_REBIND ||
1000 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1001 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1002 status = DHCPV6_STATUS_NOBINDING;
1003 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1004 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1005 hdr->msg_type == DHCPV6_MSG_REBIND) {
1006 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1008 apply_lease(iface, a, true);
1009 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1011 apply_lease(iface, a, false);
1012 update_state = true;
1013 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1015 a->valid_until = now + 3600; // Block address for 1h
1016 update_state = true;
1018 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1019 // Always send NOTONLINK for CONFIRM so that clients restart connection
1020 status = DHCPV6_STATUS_NOTONLINK;
1021 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1024 buf += ia_response_len;
1025 buflen -= ia_response_len;
1026 response_len += ia_response_len;
1029 if (hdr->msg_type == DHCPV6_MSG_RELEASE && response_len + 6 < buflen) {
1031 buf[1] = DHCPV6_OPT_STATUS;
1035 buf[5] = DHCPV6_STATUS_OK;
1040 dhcpv6_write_statefile();
1043 return response_len;