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 reconf_timer(struct uloop_timeout *event);
38 static struct uloop_timeout reconf_event = {.cb = reconf_timer};
39 static uint32_t serial = 0;
40 static uint8_t statemd5[16];
43 int dhcpv6_ia_init(void)
45 uloop_timeout_set(&reconf_event, 2000);
50 void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
52 if (c->managed_sock.fd.registered) {
53 ustream_free(&c->managed_sock.stream);
54 close(c->managed_sock.fd.fd);
66 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
68 if (!enable && iface->ia_assignments.next) {
69 struct dhcpv6_assignment *c;
70 while (!list_empty(&iface->ia_assignments)) {
71 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
72 free_dhcpv6_assignment(c);
76 if (enable && iface->dhcpv6 == RELAYD_SERVER) {
77 if (!iface->ia_assignments.next)
78 INIT_LIST_HEAD(&iface->ia_assignments);
80 if (list_empty(&iface->ia_assignments)) {
81 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
83 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
88 list_add(&border->head, &iface->ia_assignments);
91 // Parse static entries
93 list_for_each_entry(lease, &leases, head) {
95 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
96 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
98 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
103 if (lease->dhcpv4_leasetime > 0)
104 a->leasetime = lease->dhcpv4_leasetime;
106 a->clid_len = duid_len;
109 a->assigned = lease->hostid;
111 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
112 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
114 odhcpd_urandom(a->key, sizeof(a->key));
115 memcpy(a->clid_data, lease->duid, lease->duid_len);
116 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
120 // Assign to all interfaces
121 struct dhcpv6_assignment *c;
122 list_for_each_entry(c, &iface->ia_assignments, head) {
123 if (c->length != 128 || c->assigned > a->assigned) {
124 list_add_tail(&a->head, &c->head);
126 } else if (c->assigned == a->assigned) {
127 // Already an assignment with that number
133 if (lease->hostname[0]) {
135 a->hostname = strdup(lease->hostname);
147 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
150 struct dhcpv6_client_header hdr;
154 uint16_t hardware_type;
159 struct dhcpv6_auth_reconfigure auth;
162 uint8_t clid_data[128];
163 } __attribute__((packed)) reconf_msg = {
164 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
165 .srvid_type = htons(DHCPV6_OPT_SERVERID),
166 .srvid_len = htons(10),
167 .duid_type = htons(3),
168 .hardware_type = htons(1),
169 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
171 .msg_id = DHCPV6_MSG_RENEW,
172 .auth = {htons(DHCPV6_OPT_AUTH),
173 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
174 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
175 .clid_type = htons(DHCPV6_OPT_CLIENTID),
176 .clid_len = htons(assign->clid_len),
180 odhcpd_get_mac(iface, reconf_msg.mac);
181 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
182 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
185 uint8_t secretbytes[64];
186 memset(secretbytes, 0, sizeof(secretbytes));
187 memcpy(secretbytes, assign->key, sizeof(assign->key));
189 for (size_t i = 0; i < sizeof(secretbytes); ++i)
190 secretbytes[i] ^= 0x36;
193 md5_hash(secretbytes, sizeof(secretbytes), &md5);
194 md5_hash(iov.iov_base, iov.iov_len, &md5);
195 md5_end(reconf_msg.auth.key, &md5);
197 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
198 secretbytes[i] ^= 0x36;
199 secretbytes[i] ^= 0x5c;
203 md5_hash(secretbytes, sizeof(secretbytes), &md5);
204 md5_hash(reconf_msg.auth.key, 16, &md5);
205 md5_end(reconf_msg.auth.key, &md5);
207 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
211 void dhcpv6_write_statefile(void)
216 if (config.dhcp_statefile) {
217 time_t now = odhcpd_time(), wall_time = time(NULL);
218 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
222 lockf(fd, F_LOCK, 0);
223 if (ftruncate(fd, 0) < 0) {}
225 FILE *fp = fdopen(fd, "w");
231 struct interface *iface;
232 list_for_each_entry(iface, &interfaces, head) {
233 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
236 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
237 struct dhcpv6_assignment *c;
238 list_for_each_entry(c, &iface->ia_assignments, head) {
239 if (c->clid_len == 0 || c->managed_size < 0)
242 char ipbuf[INET6_ADDRSTRLEN];
245 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
247 // iface DUID iaid hostname lifetime assigned length [addrs...]
248 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %ld %x %u ",
249 iface->ifname, duidbuf, ntohl(c->iaid),
250 (c->hostname ? c->hostname : "-"),
251 (c->valid_until > now ?
252 (c->valid_until - now + wall_time) :
253 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
254 c->assigned, (unsigned)c->length);
256 struct in6_addr addr;
257 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
258 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
261 for (size_t i = 0; i < addrlen; ++i)
262 if (addrs[i].preferred > addrs[m].preferred ||
263 (addrs[i].preferred == addrs[m].preferred &&
264 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
267 for (size_t i = 0; i < addrlen; ++i) {
268 if (addrs[i].prefix > 96 || (!INFINITE_VALID(c->valid_until) && c->valid_until <= now) ||
269 (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
270 addrs[i].prefix == 64))
273 addr = addrs[i].addr;
274 if (c->length == 128)
275 addr.s6_addr32[3] = htonl(c->assigned);
277 addr.s6_addr32[1] |= htonl(c->assigned);
279 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
281 if (c->length == 128 && c->hostname) {
285 if (dn_expand(iface->search, iface->search + iface->search_len,
286 iface->search, b, sizeof(b)) > 0)
287 fprintf(fp, "\t%s.%s", c->hostname, b);
289 fprintf(fp, "\t%s\n", c->hostname);
290 md5_hash(ipbuf, strlen(ipbuf), &md5);
291 md5_hash(c->hostname, strlen(c->hostname), &md5);
294 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%d ", ipbuf,
295 (c->managed_size) ? addrs[i].prefix : c->length);
297 leasebuf[l - 1] = '\n';
298 fwrite(leasebuf, 1, l, fp);
302 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
303 struct dhcpv4_assignment *c;
304 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
305 char ipbuf[INET6_ADDRSTRLEN];
308 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
310 // iface DUID iaid hostname lifetime assigned length [addrs...]
311 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %ld %x 32 ",
312 iface->ifname, duidbuf,
313 (c->hostname ? c->hostname : "-"),
314 (c->valid_until > now ?
315 (c->valid_until - now + wall_time) :
316 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
319 struct in_addr addr = {htonl(c->addr)};
320 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
322 if (c->hostname[0]) {
326 if (dn_expand(iface->search, iface->search + iface->search_len,
327 iface->search, b, sizeof(b)) > 0)
328 fprintf(fp, "\t%s.%s", c->hostname, b);
330 fprintf(fp, "\t%s\n", c->hostname);
331 md5_hash(ipbuf, strlen(ipbuf), &md5);
332 md5_hash(c->hostname, strlen(c->hostname), &md5);
335 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
336 leasebuf[l - 1] = '\n';
337 fwrite(leasebuf, 1, l, fp);
346 md5_end(newmd5, &md5);
348 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
349 memcpy(statemd5, newmd5, sizeof(statemd5));
350 char *argv[2] = {config.dhcp_cb, NULL};
352 execv(argv[0], argv);
359 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
361 if (a->length > 64 || a->managed_size < 0)
364 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
365 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
367 for (size_t i = 0; i < addrlen; ++i) {
368 struct in6_addr prefix = addrs[i].addr;
369 prefix.s6_addr32[1] |= htonl(a->assigned);
370 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
371 iface, &a->peer.sin6_addr, 1024, add);
376 // More data was received from TCP connection
377 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
379 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
380 time_t now = odhcpd_time();
381 bool first = c->managed_size < 0;
385 char *data = ustream_get_read_buf(s, &pending);
386 char *end = memmem(data, pending, "\n\n", 2);
395 if (c->accept_reconf)
399 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
400 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
401 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
403 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
404 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
407 x = strtok_r(NULL, ",", &saveptr2);
408 if (sscanf(x, "%hhu", &n->prefix) < 1)
411 x = strtok_r(NULL, ",", &saveptr2);
412 if (sscanf(x, "%u", &n->preferred) < 1)
415 x = strtok_r(NULL, ",", &saveptr2);
416 if (sscanf(x, "%u", &n->valid) < 1)
419 if (n->preferred > n->valid)
422 if (UINT32_MAX - now < n->preferred)
423 n->preferred = UINT32_MAX;
427 if (UINT32_MAX - now < n->valid)
428 n->valid = UINT32_MAX;
437 ustream_consume(s, end - data);
440 if (first && c->managed_size == 0)
441 free_dhcpv6_assignment(c);
443 c->valid_until = now + 150;
447 // TCP transmission has ended, either because of success or timeout or other error
448 static void managed_handle_pd_done(struct ustream *s)
450 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
451 c->valid_until = odhcpd_time() + 15;
453 if (c->accept_reconf)
459 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
461 struct dhcpv6_assignment *c;
463 if (iface->dhcpv6_pd_manager[0]) {
464 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
467 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
469 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
470 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
471 ustream_fd_init(&assign->managed_sock, fd);
472 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
473 iaidbuf, assign->iaid, assign->length);
474 ustream_write_pending(&assign->managed_sock.stream);
475 assign->managed_size = -1;
476 assign->valid_until = odhcpd_time() + 15;
477 list_add(&assign->head, &iface->ia_assignments);
479 // Wait initial period of up to 250ms for immediate assignment
480 struct pollfd pfd = { .fd = fd, .events = POLLIN };
482 managed_handle_pd_data(&assign->managed_sock.stream, 0);
484 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
489 } else if (iface->ia_addr_len < 1) {
493 // Try honoring the hint first
494 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
495 if (assign->assigned) {
496 list_for_each_entry(c, &iface->ia_assignments, head) {
497 if (c->length == 128 || c->length == 0)
500 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
501 list_add_tail(&assign->head, &c->head);
502 apply_lease(iface, assign, true);
506 if (c->assigned != 0)
507 current = (c->assigned + (1 << (64 - c->length)));
511 // Fallback to a variable assignment
513 list_for_each_entry(c, &iface->ia_assignments, head) {
514 if (c->length == 128 || c->length == 0)
517 current = (current + asize) & (~asize);
518 if (current + asize < c->assigned) {
519 assign->assigned = current;
520 list_add_tail(&assign->head, &c->head);
521 apply_lease(iface, assign, true);
525 if (c->assigned != 0)
526 current = (c->assigned + (1 << (64 - c->length)));
533 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
535 // Seed RNG with checksum of DUID
537 for (size_t i = 0; i < assign->clid_len; ++i)
538 seed += assign->clid_data[i];
541 // Try to assign up to 100x
542 for (size_t i = 0; i < 100; ++i) {
544 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
546 struct dhcpv6_assignment *c;
547 list_for_each_entry(c, &iface->ia_assignments, head) {
551 if (c->assigned > try || c->length != 128) {
552 assign->assigned = try;
553 list_add_tail(&assign->head, &c->head);
555 } else if (c->assigned == try) {
564 void dhcpv6_ia_preupdate(struct interface *iface)
566 if (iface->dhcpv6 != RELAYD_SERVER)
569 struct dhcpv6_assignment *c, *border = list_last_entry(
570 &iface->ia_assignments, struct dhcpv6_assignment, head);
571 list_for_each_entry(c, &iface->ia_assignments, head)
572 if (c != border && !iface->managed)
573 apply_lease(iface, c, false);
576 void dhcpv6_ia_postupdate(struct interface *iface, time_t now)
578 if (iface->dhcpv6 != RELAYD_SERVER)
582 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
583 if (iface->ia_addr[i].preferred > (uint32_t)now &&
584 iface->ia_addr[i].prefix < 64 &&
585 iface->ia_addr[i].prefix > minprefix)
586 minprefix = iface->ia_addr[i].prefix;
589 struct dhcpv6_assignment *border = list_last_entry(
590 &iface->ia_assignments, struct dhcpv6_assignment, head);
591 if (minprefix > 32 && minprefix <= 64)
592 border->assigned = 1U << (64 - minprefix);
594 border->assigned = 0;
596 struct list_head reassign = LIST_HEAD_INIT(reassign);
597 struct dhcpv6_assignment *c, *d;
598 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
599 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
603 if (c->length < 128 && c->assigned >= border->assigned && c != border)
604 list_move(&c->head, &reassign);
605 else if (c != border)
606 apply_lease(iface, c, true);
608 if (c->accept_reconf && c->reconf_cnt == 0) {
610 c->reconf_sent = now;
611 send_reconf(iface, c);
613 // Leave all other assignments of that client alone
614 struct dhcpv6_assignment *a;
615 list_for_each_entry(a, &iface->ia_assignments, head)
616 if (a != c && a->clid_len == c->clid_len &&
617 !memcmp(a->clid_data, c->clid_data, a->clid_len))
618 c->reconf_cnt = INT_MAX;
622 while (!list_empty(&reassign)) {
623 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
625 if (!assign_pd(iface, c)) {
627 list_add(&c->head, &iface->ia_assignments);
631 dhcpv6_write_statefile();
635 static void reconf_timer(struct uloop_timeout *event)
637 time_t now = odhcpd_time();
638 struct interface *iface;
639 list_for_each_entry(iface, &interfaces, head) {
640 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
643 struct dhcpv6_assignment *a, *n;
644 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
645 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
646 if ((a->length < 128 && a->clid_len > 0) ||
647 (a->length == 128 && a->clid_len == 0)) {
649 free_dhcpv6_assignment(a);
651 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
652 now > a->reconf_sent + (1 << a->reconf_cnt)) {
654 a->reconf_sent = now;
655 send_reconf(iface, a);
659 uloop_timeout_set(event, 2000);
663 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
664 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
665 struct interface *iface, bool request)
667 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
670 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
671 size_t datalen = sizeof(out);
672 time_t now = odhcpd_time();
675 struct __attribute__((packed)) {
679 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
682 memcpy(buf + datalen, &stat, sizeof(stat));
683 datalen += sizeof(stat);
687 if (a->leasetime > 0) {
688 leasetime = a->leasetime;
690 leasetime = iface->dhcpv4_leasetime;
694 else if (leasetime < 60)
697 uint32_t pref = leasetime;
698 uint32_t valid = leasetime;
700 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
701 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
704 for (size_t i = 0; i < addrlen; ++i)
705 if (addrs[i].preferred > addrs[m].preferred ||
706 (addrs[i].preferred == addrs[m].preferred &&
707 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
710 for (size_t i = 0; i < addrlen; ++i) {
711 uint32_t prefix_pref = addrs[i].preferred;
712 uint32_t prefix_valid = addrs[i].valid;
714 if (addrs[i].prefix > 96 ||
715 addrs[i].preferred <= (uint32_t)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 /* UINT32_MAX is considered as infinite leasetime */
777 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
778 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
779 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
789 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
790 uint16_t otype, olen;
791 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
792 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
793 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
794 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
795 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
800 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
801 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
803 for (size_t i = 0; i < addrlen; ++i) {
804 if (addrs[i].prefix > 96 ||
805 addrs[i].preferred <= (uint32_t)now)
808 struct in6_addr addr = addrs[i].addr;
809 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
810 addr.s6_addr32[1] |= htonl(a->assigned);
812 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
813 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
816 addr.s6_addr32[3] = htonl(a->assigned);
818 if (!memcmp(&n->addr, &addr, sizeof(addr)))
825 if (otype == DHCPV6_OPT_IA_PREFIX) {
826 struct dhcpv6_ia_prefix inv = {
827 .type = htons(DHCPV6_OPT_IA_PREFIX),
828 .len = htons(sizeof(inv) - 4),
835 if (datalen + sizeof(inv) > buflen)
838 memcpy(buf + datalen, &inv, sizeof(inv));
839 datalen += sizeof(inv);
841 struct dhcpv6_ia_addr inv = {
842 .type = htons(DHCPV6_OPT_IA_ADDR),
843 .len = htons(sizeof(inv) - 4),
849 if (datalen + sizeof(inv) > buflen)
852 memcpy(buf + datalen, &inv, sizeof(inv));
853 datalen += sizeof(inv);
860 out.len = htons(datalen - 4);
861 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 (addrs[i].prefix > 96 || addrs[i].preferred <= (uint32_t)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);
947 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
948 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
950 time_t now = odhcpd_time();
951 size_t response_len = 0;
952 const struct dhcpv6_client_header *hdr = data;
953 uint8_t *start = (uint8_t*)&hdr[1], *odata;
954 uint16_t otype, olen;
956 // Find and parse client-id and hostname
957 bool accept_reconf = false;
958 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
960 size_t hostname_len = 0;
961 bool notonlink = false;
964 dhcpv6_for_each_option(start, end, otype, olen, odata) {
965 if (otype == DHCPV6_OPT_CLIENTID) {
969 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
970 memcpy(mac, &odata[8], sizeof(mac));
971 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
972 memcpy(mac, &odata[4], sizeof(mac));
975 odhcpd_hexlify(duidbuf, odata, olen);
976 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
977 uint8_t fqdn_buf[256];
978 memcpy(fqdn_buf, odata, olen);
979 fqdn_buf[olen++] = 0;
981 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
982 hostname_len = strcspn(hostname, ".");
983 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
984 accept_reconf = true;
988 if (!clid_data || !clid_len || clid_len > 130)
991 struct dhcpv6_assignment *first = NULL;
992 dhcpv6_for_each_option(start, end, otype, olen, odata) {
993 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
994 bool is_na = (otype == DHCPV6_OPT_IA_NA);
995 bool ia_addr_present = false;
996 if (!is_pd && !is_na)
999 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1000 size_t ia_response_len = 0;
1001 uint8_t reqlen = (is_pd) ? 62 : 128;
1002 uint32_t reqhint = 0;
1004 // Parse request hint for IA-PD
1007 uint16_t stype, slen;
1008 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1009 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1012 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1015 reqhint = ntohl(p->addr.s6_addr32[1]);
1016 if (reqlen > 32 && reqlen <= 64)
1017 reqhint &= (1U << (64 - reqlen)) - 1;
1025 uint16_t stype, slen;
1026 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1027 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1030 ia_addr_present = true;
1035 struct dhcpv6_assignment *c, *a = NULL;
1036 list_for_each_entry(c, &iface->ia_assignments, head) {
1037 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1038 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1039 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1040 (c->iaid == ia->iaid || INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1041 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1045 apply_lease(iface, a, false);
1046 memcpy(a->clid_data, clid_data, clid_len);
1047 a->clid_len = clid_len;
1056 // Generic message handling
1057 uint16_t status = DHCPV6_STATUS_OK;
1058 if (a && a->managed_size < 0) {
1060 } else if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
1061 bool assigned = !!a;
1063 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
1064 a = calloc(1, sizeof(*a) + clid_len);
1066 a->clid_len = clid_len;
1070 a->assigned = reqhint;
1073 memcpy(a->key, first->key, sizeof(a->key));
1075 odhcpd_urandom(a->key, sizeof(a->key));
1076 memcpy(a->clid_data, clid_data, clid_len);
1079 while (!(assigned = assign_pd(iface, a)) &&
1080 !a->managed_size && ++a->length <= 64);
1082 assigned = assign_na(iface, a);
1084 if (a->managed_size && !assigned)
1089 if (!assigned || iface->ia_addr_len == 0) { // Set error status
1090 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1091 } else if (assigned && !first) { //
1092 size_t handshake_len = 4;
1094 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1098 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1099 struct dhcpv6_auth_reconfigure auth = {
1100 htons(DHCPV6_OPT_AUTH),
1101 htons(sizeof(auth) - 4),
1103 {htonl(time(NULL)), htonl(++serial)},
1107 memcpy(auth.key, a->key, sizeof(a->key));
1108 memcpy(buf + handshake_len, &auth, sizeof(auth));
1109 handshake_len += sizeof(auth);
1112 buf += handshake_len;
1113 buflen -= handshake_len;
1114 response_len += handshake_len;
1119 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1121 // Was only a solicitation: mark binding for removal
1122 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1123 a->valid_until = now;
1124 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
1125 if (hostname_len > 0) {
1126 a->hostname = realloc(a->hostname, hostname_len + 1);
1128 memcpy(a->hostname, hostname, hostname_len);
1129 a->hostname[hostname_len] = 0;
1132 a->accept_reconf = accept_reconf;
1133 apply_lease(iface, a, true);
1134 } else if (!assigned && a && a->managed_size == 0) { // Cleanup failed assignment
1135 free_dhcpv6_assignment(a);
1137 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1138 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1139 hdr->msg_type == DHCPV6_MSG_REBIND ||
1140 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1141 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1142 status = DHCPV6_STATUS_NOBINDING;
1143 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1144 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1145 hdr->msg_type == DHCPV6_MSG_REBIND) {
1146 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1148 apply_lease(iface, a, true);
1149 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1150 a->valid_until = now - 1;
1151 apply_lease(iface, a, false);
1152 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1154 a->valid_until = now + 3600; // Block address for 1h
1156 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1157 // Send NOTONLINK for CONFIRM with addr present so that clients restart connection
1158 status = DHCPV6_STATUS_NOTONLINK;
1159 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1163 buf += ia_response_len;
1164 buflen -= ia_response_len;
1165 response_len += ia_response_len;
1166 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1169 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1170 response_len + 6 < buflen) {
1172 buf[1] = DHCPV6_OPT_STATUS;
1176 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1180 dhcpv6_write_statefile();
1183 return response_len;