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;
38 int dhcpv6_ia_init(void)
40 uloop_timeout_set(&reconf_event, 2000);
45 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
47 if (!enable && iface->ia_assignments.next) {
48 struct dhcpv6_assignment *c;
49 while (!list_empty(&iface->ia_assignments)) {
50 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
58 if (iface->dhcpv6 == RELAYD_SERVER) {
59 if (!iface->ia_assignments.next)
60 INIT_LIST_HEAD(&iface->ia_assignments);
62 if (list_empty(&iface->ia_assignments)) {
63 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
65 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
70 list_add(&border->head, &iface->ia_assignments);
75 // Parse static entries
77 list_for_each_entry(lease, &leases, head) {
79 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + lease->duid_len);
81 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
86 a->clid_len = lease->duid_len;
89 a->assigned = lease->hostid;
91 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
92 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
94 odhcpd_urandom(a->key, sizeof(a->key));
95 memcpy(a->clid_data, lease->duid, a->clid_len);
96 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
98 // Assign to all interfaces
99 struct dhcpv6_assignment *c;
100 list_for_each_entry(c, &iface->ia_assignments, head) {
101 if (c->length != 128 || c->assigned > a->assigned) {
102 list_add_tail(&a->head, &c->head);
103 } else if (c->assigned == a->assigned) {
104 // Already an assignment with that number
110 if (lease->hostname[0]) {
112 a->hostname = strdup(lease->hostname);
125 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
128 struct dhcpv6_client_header hdr;
132 uint16_t hardware_type;
137 struct dhcpv6_auth_reconfigure auth;
140 uint8_t clid_data[128];
141 } __attribute__((packed)) reconf_msg = {
142 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
143 .srvid_type = htons(DHCPV6_OPT_SERVERID),
144 .srvid_len = htons(10),
145 .duid_type = htons(3),
146 .hardware_type = htons(1),
147 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
149 .msg_id = DHCPV6_MSG_RENEW,
150 .auth = {htons(DHCPV6_OPT_AUTH),
151 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
152 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
153 .clid_type = htons(DHCPV6_OPT_CLIENTID),
154 .clid_len = htons(assign->clid_len),
158 odhcpd_get_mac(iface, reconf_msg.mac);
159 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
160 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
163 uint8_t secretbytes[16];
164 memcpy(secretbytes, assign->key, sizeof(secretbytes));
166 for (size_t i = 0; i < sizeof(secretbytes); ++i)
167 secretbytes[i] ^= 0x36;
170 md5_hash(secretbytes, sizeof(secretbytes), &md5);
171 md5_hash(iov.iov_base, iov.iov_len, &md5);
172 md5_end(reconf_msg.auth.key, &md5);
174 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
175 secretbytes[i] ^= 0x36;
176 secretbytes[i] ^= 0x5c;
180 md5_hash(secretbytes, sizeof(secretbytes), &md5);
181 md5_hash(reconf_msg.auth.key, 16, &md5);
182 md5_end(reconf_msg.auth.key, &md5);
184 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
188 void dhcpv6_write_statefile(void)
190 if (config.dhcp_statefile) {
191 time_t now = odhcpd_time(), wall_time = time(NULL);
192 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
196 lockf(fd, F_LOCK, 0);
199 FILE *fp = fdopen(fd, "w");
205 struct interface *iface;
206 list_for_each_entry(iface, &interfaces, head) {
207 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
210 if (iface->dhcpv6 == RELAYD_SERVER) {
211 struct dhcpv6_assignment *c;
212 list_for_each_entry(c, &iface->ia_assignments, head) {
213 if (c->clid_len == 0)
216 char ipbuf[INET6_ADDRSTRLEN];
219 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
221 // iface DUID iaid hostname lifetime assigned length [addrs...]
222 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %u %x %u ",
223 iface->ifname, duidbuf, ntohl(c->iaid),
224 (c->hostname ? c->hostname : "-"),
225 (unsigned)(c->valid_until > now ?
226 (c->valid_until - now + wall_time) : 0),
227 c->assigned, (unsigned)c->length);
229 struct in6_addr addr;
230 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
231 if (iface->ia_addr[i].prefix > 64)
234 addr = iface->ia_addr[i].addr;
235 if (c->length == 128)
236 addr.s6_addr32[3] = htonl(c->assigned);
238 addr.s6_addr32[1] |= htonl(c->assigned);
239 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
241 if (c->length == 128 && c->hostname && i == 0)
242 fprintf(fp, "%s\t%s\n", ipbuf, c->hostname);
244 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%hhu ", ipbuf, c->length);
246 leasebuf[l - 1] = '\n';
247 fwrite(leasebuf, 1, l, fp);
251 if (iface->dhcpv4 == RELAYD_SERVER) {
252 struct dhcpv4_assignment *c;
253 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
254 char ipbuf[INET6_ADDRSTRLEN];
257 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
259 // iface DUID iaid hostname lifetime assigned length [addrs...]
260 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %u %x 32 ",
261 iface->ifname, duidbuf,
262 (c->hostname ? c->hostname : "-"),
263 (unsigned)(c->valid_until > now ?
264 (c->valid_until - now + wall_time) : 0),
267 struct in_addr addr = {htonl(c->addr)};
268 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
271 fprintf(fp, "%s\t%s\n", ipbuf, c->hostname);
273 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
274 leasebuf[l - 1] = '\n';
275 fwrite(leasebuf, 1, l, fp);
283 if (config.dhcp_cb) {
284 char *argv[2] = {config.dhcp_cb, NULL};
286 execv(argv[0], argv);
293 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
298 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
299 struct in6_addr prefix = iface->ia_addr[i].addr;
300 prefix.s6_addr32[1] |= htonl(a->assigned);
301 odhcpd_setup_route(&prefix, a->length, iface, &a->peer.sin6_addr, add);
306 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
308 struct dhcpv6_assignment *c;
309 if (iface->ia_addr_len < 1)
312 // Try honoring the hint first
313 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
314 if (assign->assigned) {
315 list_for_each_entry(c, &iface->ia_assignments, head) {
316 if (c->length == 128)
319 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
320 list_add_tail(&assign->head, &c->head);
321 apply_lease(iface, assign, true);
325 if (c->assigned != 0)
326 current = (c->assigned + (1 << (64 - c->length)));
330 // Fallback to a variable assignment
332 list_for_each_entry(c, &iface->ia_assignments, head) {
333 if (c->length == 128)
336 current = (current + asize) & (~asize);
337 if (current + asize < c->assigned) {
338 assign->assigned = current;
339 list_add_tail(&assign->head, &c->head);
340 apply_lease(iface, assign, true);
344 if (c->assigned != 0)
345 current = (c->assigned + (1 << (64 - c->length)));
352 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
355 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
356 if (!iface->ia_addr[i].has_class) {
359 } else if (assign->classes_cnt) {
360 for (size_t j = 0; j < assign->classes_cnt; ++j)
361 if (assign->classes[j] == iface->ia_addr[i].class)
363 } else if (assign->all_class) {
371 // Seed RNG with checksum of DUID
373 for (size_t i = 0; i < assign->clid_len; ++i)
374 seed += assign->clid_data[i];
377 // Try to assign up to 100x
378 for (size_t i = 0; i < 100; ++i) {
380 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
382 struct dhcpv6_assignment *c;
383 list_for_each_entry(c, &iface->ia_assignments, head) {
384 if (c->assigned > try || c->length != 128) {
385 assign->assigned = try;
386 list_add_tail(&assign->head, &c->head);
388 } else if (c->assigned == try) {
398 static int prefixcmp(const void *va, const void *vb)
400 const struct odhcpd_ipaddr *a = va, *b = vb;
401 uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1;
402 uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1;
403 return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
407 static void update(struct interface *iface)
409 struct odhcpd_ipaddr addr[8];
410 memset(addr, 0, sizeof(addr));
411 int len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8);
416 qsort(addr, len, sizeof(*addr), prefixcmp);
418 time_t now = odhcpd_time();
421 for (int i = 0; i < len; ++i) {
422 if (addr[i].prefix > minprefix)
423 minprefix = addr[i].prefix;
425 addr[i].addr.s6_addr32[2] = 0;
426 addr[i].addr.s6_addr32[3] = 0;
428 if (addr[i].preferred < UINT32_MAX - now)
429 addr[i].preferred += now;
431 if (addr[i].valid < UINT32_MAX - now)
432 addr[i].valid += now;
435 struct dhcpv6_assignment *border = list_last_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
436 border->assigned = 1 << (64 - minprefix);
438 bool change = len != (int)iface->ia_addr_len;
439 for (int i = 0; !change && i < len; ++i)
440 if (addr[i].addr.s6_addr32[0] != iface->ia_addr[i].addr.s6_addr32[0] ||
441 addr[i].addr.s6_addr32[1] != iface->ia_addr[i].addr.s6_addr32[1] ||
442 (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) ||
443 (addr[i].valid > (uint32_t)now + 7200) !=
444 (iface->ia_addr[i].valid > (uint32_t)now + 7200))
448 struct dhcpv6_assignment *c;
449 list_for_each_entry(c, &iface->ia_assignments, head)
451 apply_lease(iface, c, false);
454 memcpy(iface->ia_addr, addr, len * sizeof(*addr));
455 iface->ia_addr_len = len;
457 if (change) { // Addresses / prefixes have changed
458 struct list_head reassign = LIST_HEAD_INIT(reassign);
459 struct dhcpv6_assignment *c, *d;
460 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
461 if (c->clid_len == 0 || c->valid_until < now)
464 if (c->length < 128 && c->assigned >= border->assigned && c != border)
465 list_move(&c->head, &reassign);
466 else if (c != border)
467 apply_lease(iface, c, true);
469 if (c->accept_reconf && c->reconf_cnt == 0) {
471 c->reconf_sent = now;
472 send_reconf(iface, c);
474 // Leave all other assignments of that client alone
475 struct dhcpv6_assignment *a;
476 list_for_each_entry(a, &iface->ia_assignments, head)
477 if (a != c && a->clid_len == c->clid_len &&
478 !memcmp(a->clid_data, c->clid_data, a->clid_len))
479 c->reconf_cnt = INT_MAX;
483 while (!list_empty(&reassign)) {
484 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
486 if (!assign_pd(iface, c)) {
488 list_add(&c->head, &iface->ia_assignments);
492 dhcpv6_write_statefile();
497 static void reconf_timer(struct uloop_timeout *event)
499 time_t now = odhcpd_time();
500 struct interface *iface;
501 list_for_each_entry(iface, &interfaces, head) {
502 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
505 struct dhcpv6_assignment *a, *n;
506 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
507 if (a->valid_until < now) {
508 if ((a->length < 128 && a->clid_len > 0) ||
509 (a->length == 128 && a->clid_len == 0)) {
515 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
516 now > a->reconf_sent + (1 << a->reconf_cnt)) {
518 a->reconf_sent = now;
519 send_reconf(iface, a);
523 if (iface->ia_reconf) {
525 iface->ia_reconf = false;
529 uloop_timeout_set(event, 2000);
533 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
534 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
535 struct interface *iface, bool request)
537 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
540 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
541 size_t datalen = sizeof(out);
542 time_t now = odhcpd_time();
545 struct __attribute__((packed)) {
549 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
552 memcpy(buf + datalen, &stat, sizeof(stat));
553 datalen += sizeof(stat);
556 uint32_t pref = 3600;
557 uint32_t valid = 3600;
559 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
561 if (iface->ia_addr[i].has_class) {
563 if (a->classes_cnt) {
564 for (size_t j = 0; j < a->classes_cnt; ++j)
565 if (a->classes[j] == iface->ia_addr[i].class)
567 } else if (a->all_class) {
575 uint32_t prefix_pref = iface->ia_addr[i].preferred - now;
576 uint32_t prefix_valid = iface->ia_addr[i].valid - now;
578 if (iface->ia_addr[i].prefix > 64 ||
579 iface->ia_addr[i].preferred <= (uint32_t)now)
582 if (prefix_pref > 86400)
585 if (prefix_valid > 86400)
586 prefix_valid = 86400;
588 #ifdef DHCPV6_OPT_PREFIX_CLASS
593 } pclass = {htons(DHCPV6_OPT_PREFIX_CLASS),
594 htons(2), htons(iface->ia_addr[i].class)};
597 if (a->length < 128) {
598 struct dhcpv6_ia_prefix p = {
599 .type = htons(DHCPV6_OPT_IA_PREFIX),
600 .len = htons(sizeof(p) - 4),
601 .preferred = htonl(prefix_pref),
602 .valid = htonl(prefix_valid),
604 .addr = iface->ia_addr[i].addr
606 p.addr.s6_addr32[1] |= htonl(a->assigned);
607 size_t entrlen = sizeof(p) - 4;
609 #ifdef DHCPV6_OPT_PREFIX_CLASS
610 if (iface->ia_addr[i].has_class) {
611 entrlen += sizeof(pclass);
612 p.len = htons(entrlen);
616 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
619 memcpy(buf + datalen, &p, sizeof(p));
620 #ifdef DHCPV6_OPT_PREFIX_CLASS
621 memcpy(buf + datalen + sizeof(p), &pclass, sizeof(pclass));
623 datalen += entrlen + 4;
625 struct dhcpv6_ia_addr n = {
626 .type = htons(DHCPV6_OPT_IA_ADDR),
627 .len = htons(sizeof(n) - 4),
628 .addr = iface->ia_addr[i].addr,
629 .preferred = htonl(prefix_pref),
630 .valid = htonl(prefix_valid)
632 n.addr.s6_addr32[3] = htonl(a->assigned);
633 size_t entrlen = sizeof(n) - 4;
635 #ifdef DHCPV6_OPT_PREFIX_CLASS
636 if (iface->ia_addr[i].has_class) {
637 entrlen += sizeof(pclass);
638 n.len = htons(entrlen);
642 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
645 memcpy(buf + datalen, &n, sizeof(n));
646 #ifdef DHCPV6_OPT_PREFIX_CLASS
647 memcpy(buf + datalen + sizeof(n), &pclass, sizeof(pclass));
649 datalen += entrlen + 4;
652 // Calculate T1 / T2 based on non-deprecated addresses
653 if (prefix_pref > 0) {
654 if (prefix_pref < pref)
657 if (prefix_valid < valid)
658 valid = prefix_valid;
662 a->valid_until = valid + now;
663 out.t1 = htonl(pref * 5 / 10);
664 out.t2 = htonl(pref * 8 / 10);
674 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
675 uint16_t otype, olen;
676 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
677 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
678 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
679 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
680 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
685 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
686 if (iface->ia_addr[i].prefix > 64 ||
687 iface->ia_addr[i].preferred <= (uint32_t)now)
690 struct in6_addr addr = iface->ia_addr[i].addr;
691 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
692 addr.s6_addr32[1] |= htonl(a->assigned);
694 if (IN6_ARE_ADDR_EQUAL(&p->addr, &addr) &&
695 p->prefix == a->length)
698 addr.s6_addr32[3] = htonl(a->assigned);
700 if (IN6_ARE_ADDR_EQUAL(&n->addr, &addr))
707 if (otype == DHCPV6_OPT_IA_PREFIX) {
708 struct dhcpv6_ia_prefix inv = {
709 .type = htons(DHCPV6_OPT_IA_PREFIX),
710 .len = htons(sizeof(inv) - 4),
717 if (datalen + sizeof(inv) > buflen)
720 memcpy(buf + datalen, &inv, sizeof(inv));
721 datalen += sizeof(inv);
723 struct dhcpv6_ia_addr inv = {
724 .type = htons(DHCPV6_OPT_IA_ADDR),
725 .len = htons(sizeof(inv) - 4),
731 if (datalen + sizeof(inv) > buflen)
734 memcpy(buf + datalen, &inv, sizeof(inv));
735 datalen += sizeof(inv);
742 out.len = htons(datalen - 4);
743 memcpy(buf, &out, sizeof(out));
748 size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
749 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
751 time_t now = odhcpd_time();
752 size_t response_len = 0;
753 const struct dhcpv6_client_header *hdr = data;
754 uint8_t *start = (uint8_t*)&hdr[1], *odata;
755 uint16_t otype, olen;
757 // Find and parse client-id and hostname
758 bool accept_reconf = false;
759 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
761 size_t hostname_len = 0;
762 bool class_oro = false;
763 dhcpv6_for_each_option(start, end, otype, olen, odata) {
764 if (otype == DHCPV6_OPT_CLIENTID) {
768 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
769 memcpy(mac, &odata[8], sizeof(mac));
770 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
771 memcpy(mac, &odata[4], sizeof(mac));
772 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
773 uint8_t fqdn_buf[256];
774 memcpy(fqdn_buf, odata, olen);
775 fqdn_buf[olen++] = 0;
777 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
778 hostname_len = strcspn(hostname, ".");
779 } else if (otype == DHCPV6_OPT_ORO) {
780 #ifdef DHCPV6_OPT_PREFIX_CLASS
781 for (size_t i = 0; i + 1 < olen; i += 2) {
782 if (odata[i] == (DHCPV6_OPT_PREFIX_CLASS >> 8) &&
783 odata[i + 1] == (DHCPV6_OPT_PREFIX_CLASS & 0xff))
787 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
788 accept_reconf = true;
792 if (!clid_data || !clid_len || clid_len > 130)
796 bool update_state = false;
798 struct dhcpv6_assignment *first = NULL;
799 dhcpv6_for_each_option(start, end, otype, olen, odata) {
800 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
801 bool is_na = (otype == DHCPV6_OPT_IA_NA);
802 if (!is_pd && !is_na)
805 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
806 size_t ia_response_len = 0;
807 uint8_t reqlen = (is_pd) ? 62 : 128;
808 uint32_t reqhint = 0;
810 const uint8_t classes_max = 32;
811 uint8_t classes_cnt = 0;
812 uint16_t classes[classes_max];
814 // Parse request hint for IA-PD
817 uint16_t stype, slen;
818 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
819 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
822 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
825 reqhint = ntohl(p->addr.s6_addr32[1]);
826 if (reqlen > 32 && reqlen <= 64)
827 reqhint &= (1U << (64 - reqlen)) - 1;
830 #ifdef DHCPV6_OPT_PREFIX_CLASS
832 uint16_t xtype, xlen;
833 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
834 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
837 if (classes_cnt >= classes_max)
840 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
849 uint16_t stype, slen;
850 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
851 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
854 #ifdef DHCPV6_OPT_PREFIX_CLASS
856 uint16_t xtype, xlen;
857 struct dhcpv6_ia_addr *p = (struct dhcpv6_ia_addr*)&sdata[-4];
858 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
859 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
862 if (classes_cnt >= classes_max)
865 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
872 struct dhcpv6_assignment *c, *a = NULL;
873 list_for_each_entry(c, &iface->ia_assignments, head) {
874 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
875 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
876 && !memcmp(c->mac, mac, sizeof(mac)))) &&
877 (c->iaid == ia->iaid || c->valid_until < now) &&
878 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
882 apply_lease(iface, a, false);
883 memcpy(a->clid_data, clid_data, clid_len);
884 a->clid_len = clid_len;
889 a->all_class = class_oro;
890 a->classes_cnt = classes_cnt;
891 a->classes = realloc(a->classes, classes_cnt * sizeof(uint16_t));
893 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
898 // Generic message handling
899 uint16_t status = DHCPV6_STATUS_OK;
900 if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
903 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
904 a = calloc(1, sizeof(*a) + clid_len);
906 a->clid_len = clid_len;
910 a->assigned = reqhint;
911 a->all_class = class_oro;
912 a->classes_cnt = classes_cnt;
914 a->classes = malloc(classes_cnt * sizeof(uint16_t));
916 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
920 memcpy(a->key, first->key, sizeof(a->key));
922 odhcpd_urandom(a->key, sizeof(a->key));
923 memcpy(a->clid_data, clid_data, clid_len);
926 while (!(assigned = assign_pd(iface, a)) && ++a->length <= 64);
928 assigned = assign_na(iface, a);
932 if (!assigned || iface->ia_addr_len == 0) { // Set error status
933 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
934 } else if (assigned && !first) { //
935 size_t handshake_len = 4;
937 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
941 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
942 struct dhcpv6_auth_reconfigure auth = {
943 htons(DHCPV6_OPT_AUTH),
944 htons(sizeof(auth) - 4),
946 {htonl(time(NULL)), htonl(++serial)},
950 memcpy(auth.key, a->key, sizeof(a->key));
951 memcpy(buf + handshake_len, &auth, sizeof(auth));
952 handshake_len += sizeof(auth);
955 buf += handshake_len;
956 buflen -= handshake_len;
957 response_len += handshake_len;
962 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
964 // Was only a solicitation: mark binding for removal
965 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
967 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
968 if (hostname_len > 0) {
969 a->hostname = realloc(a->hostname, hostname_len + 1);
971 memcpy(a->hostname, hostname, hostname_len);
972 a->hostname[hostname_len] = 0;
975 a->accept_reconf = accept_reconf;
976 apply_lease(iface, a, true);
978 } else if (!assigned && a) { // Cleanup failed assignment
983 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
984 hdr->msg_type == DHCPV6_MSG_RELEASE ||
985 hdr->msg_type == DHCPV6_MSG_REBIND ||
986 hdr->msg_type == DHCPV6_MSG_DECLINE) {
987 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
988 status = DHCPV6_STATUS_NOBINDING;
989 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
990 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
991 hdr->msg_type == DHCPV6_MSG_REBIND) {
992 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
994 apply_lease(iface, a, true);
995 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
997 apply_lease(iface, a, false);
999 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1001 a->valid_until = now + 3600; // Block address for 1h
1002 update_state = true;
1004 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1005 // Always send NOTONLINK for CONFIRM so that clients restart connection
1006 status = DHCPV6_STATUS_NOTONLINK;
1007 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1010 buf += ia_response_len;
1011 buflen -= ia_response_len;
1012 response_len += ia_response_len;
1015 if (hdr->msg_type == DHCPV6_MSG_RELEASE && response_len + 6 < buflen) {
1017 buf[1] = DHCPV6_OPT_STATUS;
1021 buf[5] = DHCPV6_STATUS_OK;
1026 dhcpv6_write_statefile();
1029 return response_len;