2 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
19 #include "libubox/md5.h"
20 #include "libubox/usock.h"
34 #include <arpa/inet.h>
35 #include <sys/timerfd.h>
37 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c);
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];
43 int dhcpv6_ia_init(void)
45 uloop_timeout_set(&reconf_event, 2000);
49 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
51 if (!enable && iface->ia_assignments.next) {
52 struct dhcpv6_assignment *c;
53 while (!list_empty(&iface->ia_assignments)) {
54 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
55 free_dhcpv6_assignment(c);
59 if (enable && 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);
74 /* Parse static entries */
76 list_for_each_entry(lease, &leases, head) {
78 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
79 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
81 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
86 if (lease->dhcpv4_leasetime > 0)
87 a->leasetime = lease->dhcpv4_leasetime;
89 a->clid_len = duid_len;
92 a->assigned = lease->hostid;
94 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
95 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
98 odhcpd_urandom(a->key, sizeof(a->key));
99 memcpy(a->clid_data, lease->duid, lease->duid_len);
100 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
101 /* Static assignment */
102 a->flags |= OAF_STATIC;
106 // Assign to all interfaces
107 struct dhcpv6_assignment *c;
108 list_for_each_entry(c, &iface->ia_assignments, head) {
109 if (c->length != 128 || c->assigned > a->assigned) {
110 list_add_tail(&a->head, &c->head);
112 } else if (c->assigned == a->assigned)
113 /* Already an assignment with that number */
118 if (lease->hostname[0]) {
120 a->hostname = strdup(lease->hostname);
123 free_dhcpv6_assignment(a);
129 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
131 if (c->managed_sock.fd.registered) {
132 ustream_free(&c->managed_sock.stream);
133 close(c->managed_sock.fd.fd);
144 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
146 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
149 static size_t elect_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
153 for (i = 0, m = 0; i < addrlen; ++i) {
154 if (addrs[i].preferred > addrs[m].preferred ||
155 (addrs[i].preferred == addrs[m].preferred &&
156 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
163 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
166 struct dhcpv6_client_header hdr;
170 uint16_t hardware_type;
175 struct dhcpv6_auth_reconfigure auth;
178 uint8_t clid_data[128];
179 } __attribute__((packed)) reconf_msg = {
180 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
181 .srvid_type = htons(DHCPV6_OPT_SERVERID),
182 .srvid_len = htons(10),
183 .duid_type = htons(3),
184 .hardware_type = htons(1),
185 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
187 .msg_id = DHCPV6_MSG_RENEW,
188 .auth = {htons(DHCPV6_OPT_AUTH),
189 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
190 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
191 .clid_type = htons(DHCPV6_OPT_CLIENTID),
192 .clid_len = htons(assign->clid_len),
196 odhcpd_get_mac(iface, reconf_msg.mac);
197 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
198 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
201 uint8_t secretbytes[64];
202 memset(secretbytes, 0, sizeof(secretbytes));
203 memcpy(secretbytes, assign->key, sizeof(assign->key));
205 for (size_t i = 0; i < sizeof(secretbytes); ++i)
206 secretbytes[i] ^= 0x36;
209 md5_hash(secretbytes, sizeof(secretbytes), &md5);
210 md5_hash(iov.iov_base, iov.iov_len, &md5);
211 md5_end(reconf_msg.auth.key, &md5);
213 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
214 secretbytes[i] ^= 0x36;
215 secretbytes[i] ^= 0x5c;
219 md5_hash(secretbytes, sizeof(secretbytes), &md5);
220 md5_hash(reconf_msg.auth.key, 16, &md5);
221 md5_end(reconf_msg.auth.key, &md5);
223 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
226 void dhcpv6_write_statefile(void)
231 if (config.dhcp_statefile) {
232 time_t now = odhcpd_time(), wall_time = time(NULL);
233 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
237 lockf(fd, F_LOCK, 0);
238 if (ftruncate(fd, 0) < 0) {}
240 FILE *fp = fdopen(fd, "w");
246 struct interface *iface;
247 list_for_each_entry(iface, &interfaces, head) {
248 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
251 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
252 struct dhcpv6_assignment *c;
253 list_for_each_entry(c, &iface->ia_assignments, head) {
254 if (!(c->flags & OAF_BOUND) || c->managed_size < 0)
257 char ipbuf[INET6_ADDRSTRLEN];
260 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
262 // iface DUID iaid hostname lifetime assigned length [addrs...]
263 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %ld %x %u ",
264 iface->ifname, duidbuf, ntohl(c->iaid),
265 (c->hostname ? c->hostname : "-"),
266 (c->valid_until > now ?
267 (c->valid_until - now + wall_time) :
268 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
269 c->assigned, (unsigned)c->length);
271 struct in6_addr addr;
272 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
273 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
274 size_t m = elect_addr(addrs, addrlen);
276 for (size_t i = 0; i < addrlen; ++i) {
277 if (!valid_addr(&addrs[i], now) || (!INFINITE_VALID(c->valid_until) && c->valid_until <= now) ||
278 (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
279 addrs[i].prefix <= 64))
282 addr = addrs[i].addr;
283 if (c->length == 128)
284 addr.s6_addr32[3] = htonl(c->assigned);
286 addr.s6_addr32[1] |= htonl(c->assigned);
288 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
290 if (c->length == 128 && c->hostname) {
294 if (dn_expand(iface->search, iface->search + iface->search_len,
295 iface->search, b, sizeof(b)) > 0)
296 fprintf(fp, "\t%s.%s", c->hostname, b);
298 fprintf(fp, "\t%s\n", c->hostname);
299 md5_hash(ipbuf, strlen(ipbuf), &md5);
300 md5_hash(c->hostname, strlen(c->hostname), &md5);
303 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%d ", ipbuf,
304 (c->managed_size) ? addrs[i].prefix : c->length);
306 leasebuf[l - 1] = '\n';
307 fwrite(leasebuf, 1, l, fp);
311 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
312 struct dhcpv4_assignment *c;
313 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
314 if (!(c->flags & OAF_BOUND))
317 char ipbuf[INET6_ADDRSTRLEN];
320 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
322 // iface DUID iaid hostname lifetime assigned length [addrs...]
323 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %ld %x 32 ",
324 iface->ifname, duidbuf,
325 (c->hostname ? c->hostname : "-"),
326 (c->valid_until > now ?
327 (c->valid_until - now + wall_time) :
328 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
331 struct in_addr addr = {htonl(c->addr)};
332 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
338 if (dn_expand(iface->search, iface->search + iface->search_len,
339 iface->search, b, sizeof(b)) > 0)
340 fprintf(fp, "\t%s.%s", c->hostname, b);
342 fprintf(fp, "\t%s\n", c->hostname);
343 md5_hash(ipbuf, strlen(ipbuf), &md5);
344 md5_hash(c->hostname, strlen(c->hostname), &md5);
347 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
348 leasebuf[l - 1] = '\n';
349 fwrite(leasebuf, 1, l, fp);
358 md5_end(newmd5, &md5);
360 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
361 memcpy(statemd5, newmd5, sizeof(statemd5));
362 char *argv[2] = {config.dhcp_cb, NULL};
364 execv(argv[0], argv);
371 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
373 if (a->length > 64 || a->managed_size < 0)
376 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
377 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
379 for (size_t i = 0; i < addrlen; ++i) {
380 struct in6_addr prefix = addrs[i].addr;
381 prefix.s6_addr32[1] |= htonl(a->assigned);
382 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
383 iface, &a->peer.sin6_addr, 1024, add);
387 // More data was received from TCP connection
388 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
390 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
391 time_t now = odhcpd_time();
392 bool first = c->managed_size < 0;
396 char *data = ustream_get_read_buf(s, &pending);
397 char *end = memmem(data, pending, "\n\n", 2);
406 if (c->accept_reconf)
410 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
411 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
412 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
414 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
415 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
418 x = strtok_r(NULL, ",", &saveptr2);
419 if (sscanf(x, "%hhu", &n->prefix) < 1)
422 x = strtok_r(NULL, ",", &saveptr2);
423 if (sscanf(x, "%u", &n->preferred) < 1)
426 x = strtok_r(NULL, ",", &saveptr2);
427 if (sscanf(x, "%u", &n->valid) < 1)
430 if (n->preferred > n->valid)
433 if (UINT32_MAX - now < n->preferred)
434 n->preferred = UINT32_MAX;
438 if (UINT32_MAX - now < n->valid)
439 n->valid = UINT32_MAX;
448 ustream_consume(s, end - data);
451 if (first && c->managed_size == 0)
452 free_dhcpv6_assignment(c);
454 c->valid_until = now + 150;
458 /* TCP transmission has ended, either because of success or timeout or other error */
459 static void managed_handle_pd_done(struct ustream *s)
461 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
463 c->valid_until = odhcpd_time() + 15;
466 if (c->accept_reconf)
470 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
472 struct dhcpv6_assignment *c;
474 if (iface->dhcpv6_pd_manager[0]) {
475 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
478 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
480 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
481 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
482 ustream_fd_init(&assign->managed_sock, fd);
483 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
484 iaidbuf, assign->iaid, assign->length);
485 ustream_write_pending(&assign->managed_sock.stream);
486 assign->managed_size = -1;
487 assign->valid_until = odhcpd_time() + 15;
488 list_add(&assign->head, &iface->ia_assignments);
490 /* Wait initial period of up to 250ms for immediate assignment */
491 struct pollfd pfd = { .fd = fd, .events = POLLIN };
493 managed_handle_pd_data(&assign->managed_sock.stream, 0);
495 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
500 } else if (iface->ia_addr_len < 1)
503 /* Try honoring the hint first */
504 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
505 if (assign->assigned) {
506 list_for_each_entry(c, &iface->ia_assignments, head) {
507 if (c->length == 128 || c->length == 0)
510 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
511 list_add_tail(&assign->head, &c->head);
512 apply_lease(iface, assign, true);
516 if (c->assigned != 0)
517 current = (c->assigned + (1 << (64 - c->length)));
521 /* Fallback to a variable assignment */
523 list_for_each_entry(c, &iface->ia_assignments, head) {
524 if (c->length == 128 || c->length == 0)
527 current = (current + asize) & (~asize);
528 if (current + asize < c->assigned) {
529 assign->assigned = current;
530 list_add_tail(&assign->head, &c->head);
531 apply_lease(iface, assign, true);
535 if (c->assigned != 0)
536 current = (c->assigned + (1 << (64 - c->length)));
542 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
544 /* Seed RNG with checksum of DUID */
546 for (size_t i = 0; i < assign->clid_len; ++i)
547 seed += assign->clid_data[i];
550 /* Try to assign up to 100x */
551 for (size_t i = 0; i < 100; ++i) {
553 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
555 struct dhcpv6_assignment *c;
556 list_for_each_entry(c, &iface->ia_assignments, head) {
560 if (c->assigned > try || c->length != 128) {
561 assign->assigned = try;
562 list_add_tail(&assign->head, &c->head);
564 } else if (c->assigned == try)
572 void dhcpv6_ia_preupdate(struct interface *iface)
574 if (iface->dhcpv6 != RELAYD_SERVER)
577 struct dhcpv6_assignment *c, *border = list_last_entry(
578 &iface->ia_assignments, struct dhcpv6_assignment, head);
580 list_for_each_entry(c, &iface->ia_assignments, head)
581 if (c != border && !iface->managed)
582 apply_lease(iface, c, false);
585 void dhcpv6_ia_postupdate(struct interface *iface, time_t now)
587 if (iface->dhcpv6 != RELAYD_SERVER)
591 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
592 if (iface->ia_addr[i].preferred > (uint32_t)now &&
593 iface->ia_addr[i].prefix < 64 &&
594 iface->ia_addr[i].prefix > minprefix)
595 minprefix = iface->ia_addr[i].prefix;
598 struct dhcpv6_assignment *border = list_last_entry(
599 &iface->ia_assignments, struct dhcpv6_assignment, head);
601 if (minprefix > 32 && minprefix <= 64)
602 border->assigned = 1U << (64 - minprefix);
604 border->assigned = 0;
606 struct list_head reassign = LIST_HEAD_INIT(reassign);
607 struct dhcpv6_assignment *c, *d;
608 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
609 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
613 if (c->length < 128 && c->assigned >= border->assigned && c != border)
614 list_move(&c->head, &reassign);
615 else if (c != border)
616 apply_lease(iface, c, true);
618 if (c->accept_reconf && c->reconf_cnt == 0) {
620 c->reconf_sent = now;
621 send_reconf(iface, c);
623 /* Leave all other assignments of that client alone */
624 struct dhcpv6_assignment *a;
625 list_for_each_entry(a, &iface->ia_assignments, head)
626 if (a != c && a->clid_len == c->clid_len &&
627 !memcmp(a->clid_data, c->clid_data, a->clid_len))
628 c->reconf_cnt = INT_MAX;
632 while (!list_empty(&reassign)) {
633 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
635 if (!assign_pd(iface, c)) {
637 list_add(&c->head, &iface->ia_assignments);
641 dhcpv6_write_statefile();
644 static void reconf_timer(struct uloop_timeout *event)
646 time_t now = odhcpd_time();
647 struct interface *iface;
648 list_for_each_entry(iface, &interfaces, head) {
649 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
652 struct dhcpv6_assignment *a, *n;
653 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
654 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
655 if ((a->length < 128 && a->clid_len > 0) ||
656 (a->length == 128 && a->clid_len == 0))
657 free_dhcpv6_assignment(a);
659 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
660 now > a->reconf_sent + (1 << a->reconf_cnt)) {
662 a->reconf_sent = now;
663 send_reconf(iface, a);
667 uloop_timeout_set(event, 2000);
670 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
671 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
672 struct interface *iface, bool request)
674 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
677 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
678 size_t datalen = sizeof(out);
679 time_t now = odhcpd_time();
682 struct __attribute__((packed)) {
686 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
689 memcpy(buf + datalen, &stat, sizeof(stat));
690 datalen += sizeof(stat);
694 if (a->leasetime > 0)
695 leasetime = a->leasetime;
697 leasetime = iface->dhcpv4_leasetime;
701 else if (leasetime < 60)
704 uint32_t pref = leasetime;
705 uint32_t valid = leasetime;
707 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
708 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
709 size_t m = elect_addr(addrs, addrlen);
711 for (size_t i = 0; i < addrlen; ++i) {
712 uint32_t prefix_pref = addrs[i].preferred;
713 uint32_t prefix_valid = addrs[i].valid;
715 if (!valid_addr(&addrs[i], now))
718 if (prefix_pref != UINT32_MAX)
721 if (prefix_valid != UINT32_MAX)
724 if (a->length < 128) {
725 struct dhcpv6_ia_prefix p = {
726 .type = htons(DHCPV6_OPT_IA_PREFIX),
727 .len = htons(sizeof(p) - 4),
728 .preferred = htonl(prefix_pref),
729 .valid = htonl(prefix_valid),
730 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
731 .addr = addrs[i].addr
733 p.addr.s6_addr32[1] |= htonl(a->assigned);
735 size_t entrlen = sizeof(p) - 4;
737 if (datalen + entrlen + 4 > buflen ||
738 (a->assigned == 0 && a->managed_size == 0) ||
739 (!a->managed_size && a->length <= addrs[i].prefix))
742 memcpy(buf + datalen, &p, sizeof(p));
743 datalen += entrlen + 4;
745 struct dhcpv6_ia_addr n = {
746 .type = htons(DHCPV6_OPT_IA_ADDR),
747 .len = htons(sizeof(n) - 4),
748 .addr = addrs[i].addr,
749 .preferred = htonl(prefix_pref),
750 .valid = htonl(prefix_valid)
752 n.addr.s6_addr32[3] = htonl(a->assigned);
753 size_t entrlen = sizeof(n) - 4;
755 if (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
756 addrs[i].prefix <= 64)
759 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
762 memcpy(buf + datalen, &n, sizeof(n));
763 datalen += entrlen + 4;
766 /* Calculate T1 / T2 based on non-deprecated addresses */
767 if (prefix_pref > 0) {
768 if (prefix_pref < pref)
771 if (prefix_valid < valid)
772 valid = prefix_valid;
776 if (!INFINITE_VALID(a->valid_until))
777 /* UINT32_MAX is considered as infinite leasetime */
778 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
780 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
781 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
791 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
792 uint16_t otype, olen;
793 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
794 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
795 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
796 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
797 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
802 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
803 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
805 for (size_t i = 0; i < addrlen; ++i) {
806 if (!valid_addr(&addrs[i], now))
809 struct in6_addr addr = addrs[i].addr;
810 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
811 addr.s6_addr32[1] |= htonl(a->assigned);
813 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
814 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
817 addr.s6_addr32[3] = htonl(a->assigned);
819 if (!memcmp(&n->addr, &addr, sizeof(addr)))
826 if (otype == DHCPV6_OPT_IA_PREFIX) {
827 struct dhcpv6_ia_prefix inv = {
828 .type = htons(DHCPV6_OPT_IA_PREFIX),
829 .len = htons(sizeof(inv) - 4),
836 if (datalen + sizeof(inv) > buflen)
839 memcpy(buf + datalen, &inv, sizeof(inv));
840 datalen += sizeof(inv);
842 struct dhcpv6_ia_addr inv = {
843 .type = htons(DHCPV6_OPT_IA_ADDR),
844 .len = htons(sizeof(inv) - 4),
850 if (datalen + sizeof(inv) > buflen)
853 memcpy(buf + datalen, &inv, sizeof(inv));
854 datalen += sizeof(inv);
861 out.len = htons(datalen - 4);
862 memcpy(buf, &out, sizeof(out));
866 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
867 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
869 const char *type = "UNKNOWN";
870 const char *status = "UNKNOWN";
872 if (msgtype == DHCPV6_MSG_RENEW)
876 case DHCPV6_MSG_SOLICIT:
879 case DHCPV6_MSG_REQUEST:
882 case DHCPV6_MSG_CONFIRM:
885 case DHCPV6_MSG_RENEW:
888 case DHCPV6_MSG_REBIND:
891 case DHCPV6_MSG_RELEASE:
894 case DHCPV6_MSG_DECLINE:
900 case DHCPV6_STATUS_OK:
903 case DHCPV6_STATUS_NOADDRSAVAIL:
904 status = "no addresses available";
906 case DHCPV6_STATUS_NOBINDING:
907 status = "no binding";
909 case DHCPV6_STATUS_NOTONLINK:
910 status = "not on-link";
912 case DHCPV6_STATUS_NOPREFIXAVAIL:
913 status = "no prefix available";
917 char leasebuf[256] = "";
920 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
921 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
923 char addrbuf[INET6_ADDRSTRLEN];
925 for (size_t i = 0; i < addrlen; ++i) {
926 if (!valid_addr(&addrs[i], now))
929 struct in6_addr addr = addrs[i].addr;
930 int prefix = a->managed ? addrs[i].prefix : a->length;
932 addr.s6_addr32[3] = htonl(a->assigned);
934 addr.s6_addr32[1] |= htonl(a->assigned);
936 inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
937 lbsize += snprintf(leasebuf + lbsize, sizeof(leasebuf) - lbsize, "%s/%d ", addrbuf, prefix);
941 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
942 duidbuf, iface->ifname, status, leasebuf);
945 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
946 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
948 time_t now = odhcpd_time();
949 size_t response_len = 0;
950 const struct dhcpv6_client_header *hdr = data;
951 uint8_t *start = (uint8_t*)&hdr[1], *odata;
952 uint16_t otype, olen;
953 /* Find and parse client-id and hostname */
954 bool accept_reconf = false;
955 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
957 size_t hostname_len = 0;
958 bool notonlink = false;
961 dhcpv6_for_each_option(start, end, otype, olen, odata) {
962 if (otype == DHCPV6_OPT_CLIENTID) {
966 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
967 memcpy(mac, &odata[8], sizeof(mac));
968 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
969 memcpy(mac, &odata[4], sizeof(mac));
972 odhcpd_hexlify(duidbuf, odata, olen);
973 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
974 uint8_t fqdn_buf[256];
975 memcpy(fqdn_buf, odata, olen);
976 fqdn_buf[olen++] = 0;
978 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
979 hostname_len = strcspn(hostname, ".");
980 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
981 accept_reconf = true;
984 if (!clid_data || !clid_len || clid_len > 130)
987 struct dhcpv6_assignment *first = NULL;
988 dhcpv6_for_each_option(start, end, otype, olen, odata) {
989 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
990 bool is_na = (otype == DHCPV6_OPT_IA_NA);
991 bool ia_addr_present = false;
992 if (!is_pd && !is_na)
995 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
996 size_t ia_response_len = 0;
997 uint8_t reqlen = (is_pd) ? 62 : 128;
998 uint32_t reqhint = 0;
1000 /* Parse request hint for IA-PD */
1003 uint16_t stype, slen;
1004 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1005 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1008 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1011 reqhint = ntohl(p->addr.s6_addr32[1]);
1012 if (reqlen > 32 && reqlen <= 64)
1013 reqhint &= (1U << (64 - reqlen)) - 1;
1021 uint16_t stype, slen;
1022 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1023 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1026 ia_addr_present = true;
1030 /* Find assignment */
1031 struct dhcpv6_assignment *c, *a = NULL;
1032 list_for_each_entry(c, &iface->ia_assignments, head) {
1033 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1034 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1035 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1036 (c->iaid == ia->iaid || INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1037 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1041 apply_lease(iface, a, false);
1042 memcpy(a->clid_data, clid_data, clid_len);
1043 a->clid_len = clid_len;
1052 /* Generic message handling */
1053 uint16_t status = DHCPV6_STATUS_OK;
1054 if (a && a->managed_size < 0)
1057 if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
1058 bool assigned = !!a;
1060 if (!a && !iface->no_dynamic_dhcp) {
1061 /* Create new binding */
1062 a = calloc(1, sizeof(*a) + clid_len);
1064 a->clid_len = clid_len;
1068 a->assigned = reqhint;
1069 /* Set valid time to current time indicating */
1070 /* assignment is not having infinite lifetime */
1071 a->valid_until = now;
1074 memcpy(a->key, first->key, sizeof(a->key));
1076 odhcpd_urandom(a->key, sizeof(a->key));
1077 memcpy(a->clid_data, clid_data, clid_len);
1080 while (!(assigned = assign_pd(iface, a)) &&
1081 !a->managed_size && ++a->length <= 64);
1083 assigned = assign_na(iface, a);
1085 if (a->managed_size && !assigned)
1090 if (!assigned || iface->ia_addr_len == 0)
1091 /* Set error status */
1092 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1093 else if (assigned && !first) {
1094 size_t handshake_len = 4;
1096 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1100 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1101 struct dhcpv6_auth_reconfigure auth = {
1102 htons(DHCPV6_OPT_AUTH),
1103 htons(sizeof(auth) - 4),
1105 {htonl(time(NULL)), htonl(++serial)},
1109 memcpy(auth.key, a->key, sizeof(a->key));
1110 memcpy(buf + handshake_len, &auth, sizeof(auth));
1111 handshake_len += sizeof(auth);
1114 buf += handshake_len;
1115 buflen -= handshake_len;
1116 response_len += handshake_len;
1121 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1123 /* Was only a solicitation: mark binding for removal */
1124 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1125 a->flags &= ~OAF_BOUND;
1127 if (!(a->flags & OAF_STATIC))
1128 a->valid_until = now;
1129 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
1130 if (hostname_len > 0) {
1131 a->hostname = realloc(a->hostname, hostname_len + 1);
1133 memcpy(a->hostname, hostname, hostname_len);
1134 a->hostname[hostname_len] = 0;
1137 a->accept_reconf = accept_reconf;
1138 a->flags |= OAF_BOUND;
1139 apply_lease(iface, a, true);
1140 } else if (!assigned && a && a->managed_size == 0)
1141 /* Cleanup failed assignment */
1142 free_dhcpv6_assignment(a);
1144 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1145 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1146 hdr->msg_type == DHCPV6_MSG_REBIND ||
1147 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1148 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1149 status = DHCPV6_STATUS_NOBINDING;
1150 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1151 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1152 hdr->msg_type == DHCPV6_MSG_REBIND) {
1153 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1155 a->flags |= OAF_BOUND;
1156 apply_lease(iface, a, true);
1158 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1159 if (!(a->flags & OAF_STATIC))
1160 a->valid_until = now - 1;
1162 a->flags &= ~OAF_BOUND;
1163 apply_lease(iface, a, false);
1164 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1165 a->flags &= ~OAF_BOUND;
1167 if (!(a->flags & OAF_STATIC)) {
1169 a->valid_until = now + 3600; /* Block address for 1h */
1172 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1173 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1174 status = DHCPV6_STATUS_NOTONLINK;
1175 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1179 buf += ia_response_len;
1180 buflen -= ia_response_len;
1181 response_len += ia_response_len;
1182 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1185 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1186 response_len + 6 < buflen) {
1188 buf[1] = DHCPV6_OPT_STATUS;
1192 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1196 dhcpv6_write_statefile();
1199 return response_len;