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"
19 #include "libubox/usock.h"
33 #include <arpa/inet.h>
34 #include <sys/timerfd.h>
37 static void update(struct interface *iface);
38 static void reconf_timer(struct uloop_timeout *event);
39 static struct uloop_timeout reconf_event = {.cb = reconf_timer};
40 static uint32_t serial = 0;
41 static uint8_t statemd5[16];
44 int dhcpv6_ia_init(void)
46 uloop_timeout_set(&reconf_event, 2000);
51 void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
53 if (c->managed_sock.fd.registered) {
54 ustream_free(&c->managed_sock.stream);
55 close(c->managed_sock.fd.fd);
67 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
69 if (!enable && iface->ia_assignments.next) {
70 struct dhcpv6_assignment *c;
71 while (!list_empty(&iface->ia_assignments)) {
72 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
73 free_dhcpv6_assignment(c);
77 if (enable && iface->dhcpv6 == RELAYD_SERVER) {
78 if (!iface->ia_assignments.next)
79 INIT_LIST_HEAD(&iface->ia_assignments);
81 if (list_empty(&iface->ia_assignments)) {
82 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
84 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
89 list_add(&border->head, &iface->ia_assignments);
94 // Parse static entries
96 list_for_each_entry(lease, &leases, head) {
98 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + lease->duid_len);
100 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
105 a->clid_len = lease->duid_len;
108 a->assigned = lease->hostid;
110 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
111 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
113 odhcpd_urandom(a->key, sizeof(a->key));
114 memcpy(a->clid_data, lease->duid, a->clid_len);
115 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
117 // Assign to all interfaces
118 struct dhcpv6_assignment *c;
119 list_for_each_entry(c, &iface->ia_assignments, head) {
120 if (c->length != 128 || c->assigned > a->assigned) {
121 list_add_tail(&a->head, &c->head);
123 } else if (c->assigned == a->assigned) {
124 // Already an assignment with that number
130 if (lease->hostname[0]) {
132 a->hostname = strdup(lease->hostname);
144 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
147 struct dhcpv6_client_header hdr;
151 uint16_t hardware_type;
156 struct dhcpv6_auth_reconfigure auth;
159 uint8_t clid_data[128];
160 } __attribute__((packed)) reconf_msg = {
161 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
162 .srvid_type = htons(DHCPV6_OPT_SERVERID),
163 .srvid_len = htons(10),
164 .duid_type = htons(3),
165 .hardware_type = htons(1),
166 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
168 .msg_id = DHCPV6_MSG_RENEW,
169 .auth = {htons(DHCPV6_OPT_AUTH),
170 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
171 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
172 .clid_type = htons(DHCPV6_OPT_CLIENTID),
173 .clid_len = htons(assign->clid_len),
177 odhcpd_get_mac(iface, reconf_msg.mac);
178 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
179 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
182 uint8_t secretbytes[64];
183 memset(secretbytes, 0, sizeof(secretbytes));
184 memcpy(secretbytes, assign->key, sizeof(assign->key));
186 for (size_t i = 0; i < sizeof(secretbytes); ++i)
187 secretbytes[i] ^= 0x36;
190 md5_hash(secretbytes, sizeof(secretbytes), &md5);
191 md5_hash(iov.iov_base, iov.iov_len, &md5);
192 md5_end(reconf_msg.auth.key, &md5);
194 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
195 secretbytes[i] ^= 0x36;
196 secretbytes[i] ^= 0x5c;
200 md5_hash(secretbytes, sizeof(secretbytes), &md5);
201 md5_hash(reconf_msg.auth.key, 16, &md5);
202 md5_end(reconf_msg.auth.key, &md5);
204 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
208 void dhcpv6_write_statefile(void)
213 if (config.dhcp_statefile) {
214 time_t now = odhcpd_time(), wall_time = time(NULL);
215 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
219 lockf(fd, F_LOCK, 0);
220 if (ftruncate(fd, 0) < 0) {}
222 FILE *fp = fdopen(fd, "w");
228 struct interface *iface;
229 list_for_each_entry(iface, &interfaces, head) {
230 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
233 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
234 struct dhcpv6_assignment *c;
235 list_for_each_entry(c, &iface->ia_assignments, head) {
236 if (c->clid_len == 0 || c->managed_size < 0)
239 char ipbuf[INET6_ADDRSTRLEN];
242 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
244 // iface DUID iaid hostname lifetime assigned length [addrs...]
245 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %u %x %u ",
246 iface->ifname, duidbuf, ntohl(c->iaid),
247 (c->hostname ? c->hostname : "-"),
248 (unsigned)(c->valid_until > now ?
249 (c->valid_until - now + wall_time) : 0),
250 c->assigned, (unsigned)c->length);
252 struct in6_addr addr;
253 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
254 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
257 for (size_t i = 0; i < addrlen; ++i)
258 if (addrs[i].preferred > addrs[m].preferred ||
259 (addrs[i].preferred == addrs[m].preferred &&
260 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
263 for (size_t i = 0; i < addrlen; ++i) {
264 if (addrs[i].prefix > 96 || c->valid_until <= now ||
265 (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
266 addrs[i].prefix == 64))
269 addr = addrs[i].addr;
270 if (c->length == 128)
271 addr.s6_addr32[3] = htonl(c->assigned);
273 addr.s6_addr32[1] |= htonl(c->assigned);
275 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
277 if (c->length == 128 && c->hostname) {
281 if (dn_expand(iface->search, iface->search + iface->search_len,
282 iface->search, b, sizeof(b)) > 0)
283 fprintf(fp, "\t%s.%s", c->hostname, b);
285 fprintf(fp, "\t%s\n", c->hostname);
286 md5_hash(ipbuf, strlen(ipbuf), &md5);
287 md5_hash(c->hostname, strlen(c->hostname), &md5);
290 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%d ", ipbuf,
291 (c->managed_size) ? addrs[i].prefix : c->length);
293 leasebuf[l - 1] = '\n';
294 fwrite(leasebuf, 1, l, fp);
298 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
299 struct dhcpv4_assignment *c;
300 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
301 char ipbuf[INET6_ADDRSTRLEN];
304 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
306 // iface DUID iaid hostname lifetime assigned length [addrs...]
307 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %u %x 32 ",
308 iface->ifname, duidbuf,
309 (c->hostname ? c->hostname : "-"),
310 (unsigned)(c->valid_until > now ?
311 (c->valid_until - now + wall_time) : 0),
314 struct in_addr addr = {htonl(c->addr)};
315 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
317 if (c->hostname[0]) {
321 if (dn_expand(iface->search, iface->search + iface->search_len,
322 iface->search, b, sizeof(b)) > 0)
323 fprintf(fp, "\t%s.%s", c->hostname, b);
325 fprintf(fp, "\t%s\n", c->hostname);
326 md5_hash(ipbuf, strlen(ipbuf), &md5);
327 md5_hash(c->hostname, strlen(c->hostname), &md5);
330 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
331 leasebuf[l - 1] = '\n';
332 fwrite(leasebuf, 1, l, fp);
341 md5_end(newmd5, &md5);
343 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
344 memcpy(statemd5, newmd5, sizeof(statemd5));
345 char *argv[2] = {config.dhcp_cb, NULL};
347 execv(argv[0], argv);
354 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
356 if (a->length > 64 || a->managed_size < 0)
359 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
360 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
362 for (size_t i = 0; i < addrlen; ++i) {
363 struct in6_addr prefix = addrs[i].addr;
364 prefix.s6_addr32[1] |= htonl(a->assigned);
365 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
366 iface, &a->peer.sin6_addr, add);
371 // More data was received from TCP connection
372 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
374 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
375 time_t now = odhcpd_time();
376 bool first = c->managed_size < 0;
380 char *data = ustream_get_read_buf(s, &pending);
381 char *end = memmem(data, pending, "\n\n", 2);
390 if (c->accept_reconf)
394 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
395 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
396 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
398 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
399 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
402 x = strtok_r(NULL, ",", &saveptr2);
403 if (sscanf(x, "%hhu", &n->prefix) < 1)
406 x = strtok_r(NULL, ",", &saveptr2);
407 if (sscanf(x, "%u", &n->preferred) < 1)
410 x = strtok_r(NULL, ",", &saveptr2);
411 if (sscanf(x, "%u", &n->valid) < 1)
414 if (n->preferred > n->valid)
417 if (UINT32_MAX - now < n->preferred)
418 n->preferred = UINT32_MAX;
422 if (UINT32_MAX - now < n->valid)
423 n->valid = UINT32_MAX;
432 ustream_consume(s, end - data);
435 if (first && c->managed_size == 0)
436 free_dhcpv6_assignment(c);
438 c->valid_until = now + 150;
442 // TCP transmission has ended, either because of success or timeout or other error
443 static void managed_handle_pd_done(struct ustream *s)
445 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
446 c->valid_until = odhcpd_time() + 15;
448 if (c->accept_reconf)
454 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
456 struct dhcpv6_assignment *c;
458 if (iface->dhcpv6_pd_manager[0]) {
459 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
462 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
464 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
465 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
466 ustream_fd_init(&assign->managed_sock, fd);
467 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
468 iaidbuf, assign->iaid, assign->length);
469 ustream_write_pending(&assign->managed_sock.stream);
470 assign->managed_size = -1;
471 assign->valid_until = odhcpd_time() + 15;
472 list_add(&assign->head, &iface->ia_assignments);
474 // Wait initial period of up to 250ms for immediate assignment
475 struct pollfd pfd = { .fd = fd, .events = POLLIN };
477 managed_handle_pd_data(&assign->managed_sock.stream, 0);
479 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
484 } else if (iface->ia_addr_len < 1) {
488 // Try honoring the hint first
489 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
490 if (assign->assigned) {
491 list_for_each_entry(c, &iface->ia_assignments, head) {
492 if (c->length == 128 || c->length == 0)
495 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
496 list_add_tail(&assign->head, &c->head);
497 apply_lease(iface, assign, true);
501 if (c->assigned != 0)
502 current = (c->assigned + (1 << (64 - c->length)));
506 // Fallback to a variable assignment
508 list_for_each_entry(c, &iface->ia_assignments, head) {
509 if (c->length == 128 || c->length == 0)
512 current = (current + asize) & (~asize);
513 if (current + asize < c->assigned) {
514 assign->assigned = current;
515 list_add_tail(&assign->head, &c->head);
516 apply_lease(iface, assign, true);
520 if (c->assigned != 0)
521 current = (c->assigned + (1 << (64 - c->length)));
528 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
530 // Seed RNG with checksum of DUID
532 for (size_t i = 0; i < assign->clid_len; ++i)
533 seed += assign->clid_data[i];
536 // Try to assign up to 100x
537 for (size_t i = 0; i < 100; ++i) {
539 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
541 struct dhcpv6_assignment *c;
542 list_for_each_entry(c, &iface->ia_assignments, head) {
546 if (c->assigned > try || c->length != 128) {
547 assign->assigned = try;
548 list_add_tail(&assign->head, &c->head);
550 } else if (c->assigned == try) {
560 static int prefixcmp(const void *va, const void *vb)
562 const struct odhcpd_ipaddr *a = va, *b = vb;
563 uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1;
564 uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1;
565 return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
569 static void update(struct interface *iface)
571 struct odhcpd_ipaddr addr[8];
572 memset(addr, 0, sizeof(addr));
573 int len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8);
578 qsort(addr, len, sizeof(*addr), prefixcmp);
580 time_t now = odhcpd_time();
583 for (int i = 0; i < len; ++i) {
584 if (addr[i].preferred > 0 && addr[i].prefix > minprefix)
585 minprefix = addr[i].prefix;
587 addr[i].addr.s6_addr32[3] = 0;
589 if (addr[i].preferred < UINT32_MAX - now)
590 addr[i].preferred += now;
592 if (addr[i].valid < UINT32_MAX - now)
593 addr[i].valid += now;
596 struct dhcpv6_assignment *border = list_last_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
597 if (minprefix > 32 && minprefix <= 64)
598 border->assigned = 1U << (64 - minprefix);
600 border->assigned = 0;
602 bool change = len != (int)iface->ia_addr_len;
603 for (int i = 0; !change && i < len; ++i)
604 if (addr[i].addr.s6_addr32[0] != iface->ia_addr[i].addr.s6_addr32[0] ||
605 addr[i].addr.s6_addr32[1] != iface->ia_addr[i].addr.s6_addr32[1] ||
606 (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) ||
607 (addr[i].valid > (uint32_t)now + 7200) !=
608 (iface->ia_addr[i].valid > (uint32_t)now + 7200))
612 struct dhcpv6_assignment *c;
613 list_for_each_entry(c, &iface->ia_assignments, head)
614 if (c != border && !iface->managed)
615 apply_lease(iface, c, false);
618 memcpy(iface->ia_addr, addr, len * sizeof(*addr));
619 iface->ia_addr_len = len;
621 if (change) { // Addresses / prefixes have changed
622 struct list_head reassign = LIST_HEAD_INIT(reassign);
623 struct dhcpv6_assignment *c, *d;
624 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
625 if (c->clid_len == 0 || c->valid_until < now || c->managed_size)
628 if (c->length < 128 && c->assigned >= border->assigned && c != border)
629 list_move(&c->head, &reassign);
630 else if (c != border)
631 apply_lease(iface, c, true);
633 if (c->accept_reconf && c->reconf_cnt == 0) {
635 c->reconf_sent = now;
636 send_reconf(iface, c);
638 // Leave all other assignments of that client alone
639 struct dhcpv6_assignment *a;
640 list_for_each_entry(a, &iface->ia_assignments, head)
641 if (a != c && a->clid_len == c->clid_len &&
642 !memcmp(a->clid_data, c->clid_data, a->clid_len))
643 c->reconf_cnt = INT_MAX;
647 while (!list_empty(&reassign)) {
648 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
650 if (!assign_pd(iface, c)) {
652 list_add(&c->head, &iface->ia_assignments);
656 dhcpv6_write_statefile();
661 static void reconf_timer(struct uloop_timeout *event)
663 time_t now = odhcpd_time();
664 struct interface *iface;
665 list_for_each_entry(iface, &interfaces, head) {
666 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
669 struct dhcpv6_assignment *a, *n;
670 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
671 if (a->valid_until < now) {
672 if ((a->length < 128 && a->clid_len > 0) ||
673 (a->length == 128 && a->clid_len == 0)) {
675 free_dhcpv6_assignment(a);
677 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
678 now > a->reconf_sent + (1 << a->reconf_cnt)) {
680 a->reconf_sent = now;
681 send_reconf(iface, a);
685 uloop_timeout_set(event, 2000);
689 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
690 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
691 struct interface *iface, bool request)
693 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
696 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
697 size_t datalen = sizeof(out);
698 time_t now = odhcpd_time();
701 struct __attribute__((packed)) {
705 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
708 memcpy(buf + datalen, &stat, sizeof(stat));
709 datalen += sizeof(stat);
712 uint32_t leasetime = iface->dhcpv4_leasetime;
715 else if (leasetime < 60)
718 uint32_t pref = leasetime;
719 uint32_t valid = leasetime;
721 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
722 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
725 for (size_t i = 0; i < addrlen; ++i)
726 if (addrs[i].preferred > addrs[m].preferred ||
727 (addrs[i].preferred == addrs[m].preferred &&
728 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
731 for (size_t i = 0; i < addrlen; ++i) {
732 uint32_t prefix_pref = addrs[i].preferred;
733 uint32_t prefix_valid = addrs[i].valid;
735 if (addrs[i].prefix > 96 ||
736 addrs[i].preferred <= (uint32_t)now)
739 if (prefix_pref != UINT32_MAX)
742 if (prefix_valid != UINT32_MAX)
745 if (a->length < 128) {
746 struct dhcpv6_ia_prefix p = {
747 .type = htons(DHCPV6_OPT_IA_PREFIX),
748 .len = htons(sizeof(p) - 4),
749 .preferred = htonl(prefix_pref),
750 .valid = htonl(prefix_valid),
751 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
752 .addr = addrs[i].addr
754 p.addr.s6_addr32[1] |= htonl(a->assigned);
756 size_t entrlen = sizeof(p) - 4;
758 if (datalen + entrlen + 4 > buflen ||
759 (a->assigned == 0 && a->managed_size == 0))
762 memcpy(buf + datalen, &p, sizeof(p));
763 datalen += entrlen + 4;
765 struct dhcpv6_ia_addr n = {
766 .type = htons(DHCPV6_OPT_IA_ADDR),
767 .len = htons(sizeof(n) - 4),
768 .addr = addrs[i].addr,
769 .preferred = htonl(prefix_pref),
770 .valid = htonl(prefix_valid)
772 n.addr.s6_addr32[3] = htonl(a->assigned);
773 size_t entrlen = sizeof(n) - 4;
775 if (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
776 addrs[i].prefix == 64)
779 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
782 memcpy(buf + datalen, &n, sizeof(n));
783 datalen += entrlen + 4;
786 // Calculate T1 / T2 based on non-deprecated addresses
787 if (prefix_pref > 0) {
788 if (prefix_pref < pref)
791 if (prefix_valid < valid)
792 valid = prefix_valid;
796 a->valid_until = valid + now;
797 out.t1 = htonl(pref * 5 / 10);
798 out.t2 = htonl(pref * 8 / 10);
808 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
809 uint16_t otype, olen;
810 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
811 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
812 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
813 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
814 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
819 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
820 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
822 for (size_t i = 0; i < addrlen; ++i) {
823 if (addrs[i].prefix > 96 ||
824 addrs[i].preferred <= (uint32_t)now)
827 struct in6_addr addr = addrs[i].addr;
828 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
829 addr.s6_addr32[1] |= htonl(a->assigned);
831 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
832 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
835 addr.s6_addr32[3] = htonl(a->assigned);
837 if (!memcmp(&n->addr, &addr, sizeof(addr)))
844 if (otype == DHCPV6_OPT_IA_PREFIX) {
845 struct dhcpv6_ia_prefix inv = {
846 .type = htons(DHCPV6_OPT_IA_PREFIX),
847 .len = htons(sizeof(inv) - 4),
854 if (datalen + sizeof(inv) > buflen)
857 memcpy(buf + datalen, &inv, sizeof(inv));
858 datalen += sizeof(inv);
860 struct dhcpv6_ia_addr inv = {
861 .type = htons(DHCPV6_OPT_IA_ADDR),
862 .len = htons(sizeof(inv) - 4),
868 if (datalen + sizeof(inv) > buflen)
871 memcpy(buf + datalen, &inv, sizeof(inv));
872 datalen += sizeof(inv);
879 out.len = htons(datalen - 4);
880 memcpy(buf, &out, sizeof(out));
885 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
886 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
888 const char *type = "UNKNOWN";
889 const char *status = "UNKNOWN";
891 if (msgtype == DHCPV6_MSG_RENEW)
895 case DHCPV6_MSG_SOLICIT:
898 case DHCPV6_MSG_REQUEST:
901 case DHCPV6_MSG_CONFIRM:
904 case DHCPV6_MSG_RENEW:
907 case DHCPV6_MSG_REBIND:
910 case DHCPV6_MSG_RELEASE:
913 case DHCPV6_MSG_DECLINE:
919 case DHCPV6_STATUS_OK:
922 case DHCPV6_STATUS_NOADDRSAVAIL:
923 status = "no addresses available";
925 case DHCPV6_STATUS_NOBINDING:
926 status = "no binding";
928 case DHCPV6_STATUS_NOTONLINK:
929 status = "not on-link";
931 case DHCPV6_STATUS_NOPREFIXAVAIL:
932 status = "no prefix available";
936 char leasebuf[256] = "";
939 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
940 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
942 char addrbuf[INET6_ADDRSTRLEN];
944 for (size_t i = 0; i < addrlen; ++i) {
945 if (addrs[i].prefix > 96 || addrs[i].preferred <= (uint32_t)now)
948 struct in6_addr addr = addrs[i].addr;
949 int prefix = a->managed ? addrs[i].prefix : a->length;
951 addr.s6_addr32[3] = htonl(a->assigned);
953 addr.s6_addr32[1] |= htonl(a->assigned);
955 inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
956 lbsize += snprintf(leasebuf + lbsize, sizeof(leasebuf) - lbsize, "%s/%d ", addrbuf, prefix);
960 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
961 duidbuf, iface->ifname, status, leasebuf);
966 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
967 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
969 time_t now = odhcpd_time();
970 size_t response_len = 0;
971 const struct dhcpv6_client_header *hdr = data;
972 uint8_t *start = (uint8_t*)&hdr[1], *odata;
973 uint16_t otype, olen;
975 // Find and parse client-id and hostname
976 bool accept_reconf = false;
977 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
979 size_t hostname_len = 0;
980 bool notonlink = false;
983 dhcpv6_for_each_option(start, end, otype, olen, odata) {
984 if (otype == DHCPV6_OPT_CLIENTID) {
988 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
989 memcpy(mac, &odata[8], sizeof(mac));
990 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
991 memcpy(mac, &odata[4], sizeof(mac));
994 odhcpd_hexlify(duidbuf, odata, olen);
995 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
996 uint8_t fqdn_buf[256];
997 memcpy(fqdn_buf, odata, olen);
998 fqdn_buf[olen++] = 0;
1000 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1001 hostname_len = strcspn(hostname, ".");
1002 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
1003 accept_reconf = true;
1007 if (!clid_data || !clid_len || clid_len > 130)
1012 struct dhcpv6_assignment *first = NULL;
1013 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1014 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1015 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1016 bool ia_addr_present = false;
1017 if (!is_pd && !is_na)
1020 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1021 size_t ia_response_len = 0;
1022 uint8_t reqlen = (is_pd) ? 62 : 128;
1023 uint32_t reqhint = 0;
1025 // Parse request hint for IA-PD
1028 uint16_t stype, slen;
1029 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1030 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1033 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1036 reqhint = ntohl(p->addr.s6_addr32[1]);
1037 if (reqlen > 32 && reqlen <= 64)
1038 reqhint &= (1U << (64 - reqlen)) - 1;
1046 uint16_t stype, slen;
1047 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1048 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1051 ia_addr_present = true;
1056 struct dhcpv6_assignment *c, *a = NULL;
1057 list_for_each_entry(c, &iface->ia_assignments, head) {
1058 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1059 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1060 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1061 (c->iaid == ia->iaid || c->valid_until < now) &&
1062 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1066 apply_lease(iface, a, false);
1067 memcpy(a->clid_data, clid_data, clid_len);
1068 a->clid_len = clid_len;
1077 // Generic message handling
1078 uint16_t status = DHCPV6_STATUS_OK;
1079 if (a && a->managed_size < 0) {
1081 } else if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
1082 bool assigned = !!a;
1084 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
1085 a = calloc(1, sizeof(*a) + clid_len);
1087 a->clid_len = clid_len;
1091 a->assigned = reqhint;
1094 memcpy(a->key, first->key, sizeof(a->key));
1096 odhcpd_urandom(a->key, sizeof(a->key));
1097 memcpy(a->clid_data, clid_data, clid_len);
1100 while (!(assigned = assign_pd(iface, a)) &&
1101 !a->managed_size && ++a->length <= 64);
1103 assigned = assign_na(iface, a);
1105 if (a->managed_size && !assigned)
1110 if (!assigned || iface->ia_addr_len == 0) { // Set error status
1111 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1112 } else if (assigned && !first) { //
1113 size_t handshake_len = 4;
1115 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1119 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1120 struct dhcpv6_auth_reconfigure auth = {
1121 htons(DHCPV6_OPT_AUTH),
1122 htons(sizeof(auth) - 4),
1124 {htonl(time(NULL)), htonl(++serial)},
1128 memcpy(auth.key, a->key, sizeof(a->key));
1129 memcpy(buf + handshake_len, &auth, sizeof(auth));
1130 handshake_len += sizeof(auth);
1133 buf += handshake_len;
1134 buflen -= handshake_len;
1135 response_len += handshake_len;
1140 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1142 // Was only a solicitation: mark binding for removal
1143 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1145 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
1146 if (hostname_len > 0) {
1147 a->hostname = realloc(a->hostname, hostname_len + 1);
1149 memcpy(a->hostname, hostname, hostname_len);
1150 a->hostname[hostname_len] = 0;
1153 a->accept_reconf = accept_reconf;
1154 apply_lease(iface, a, true);
1155 } else if (!assigned && a && a->managed_size == 0) { // Cleanup failed assignment
1156 free_dhcpv6_assignment(a);
1158 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1159 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1160 hdr->msg_type == DHCPV6_MSG_REBIND ||
1161 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1162 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1163 status = DHCPV6_STATUS_NOBINDING;
1164 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1165 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1166 hdr->msg_type == DHCPV6_MSG_REBIND) {
1167 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1169 apply_lease(iface, a, true);
1170 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1172 apply_lease(iface, a, false);
1173 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1175 a->valid_until = now + 3600; // Block address for 1h
1177 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1178 // Send NOTONLINK for CONFIRM with addr present so that clients restart connection
1179 status = DHCPV6_STATUS_NOTONLINK;
1180 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1184 buf += ia_response_len;
1185 buflen -= ia_response_len;
1186 response_len += ia_response_len;
1187 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1190 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1191 response_len + 6 < buflen) {
1193 buf[1] = DHCPV6_OPT_STATUS;
1197 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1201 dhcpv6_write_statefile();
1204 return response_len;