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;
54 while (!list_empty(&iface->ia_assignments)) {
55 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
56 free_dhcpv6_assignment(c);
60 if (enable && iface->dhcpv6 == RELAYD_SERVER) {
61 if (!iface->ia_assignments.next)
62 INIT_LIST_HEAD(&iface->ia_assignments);
64 if (list_empty(&iface->ia_assignments)) {
65 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
67 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
72 list_add(&border->head, &iface->ia_assignments);
75 /* Parse static entries */
77 list_for_each_entry(lease, &leases, head) {
79 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
80 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
82 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
87 if (lease->dhcpv4_leasetime > 0)
88 a->leasetime = lease->dhcpv4_leasetime;
90 a->clid_len = duid_len;
93 a->assigned = lease->hostid;
95 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
96 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
99 odhcpd_urandom(a->key, sizeof(a->key));
100 memcpy(a->clid_data, lease->duid, lease->duid_len);
101 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
102 /* Static assignment */
103 a->flags |= OAF_STATIC;
107 /* Assign to all interfaces */
108 struct dhcpv6_assignment *c;
109 list_for_each_entry(c, &iface->ia_assignments, head) {
110 if (c->length != 128 || c->assigned > a->assigned) {
111 list_add_tail(&a->head, &c->head);
113 } else if (c->assigned == a->assigned)
114 /* Already an assignment with that number */
119 if (lease->hostname[0]) {
121 a->hostname = strdup(lease->hostname);
124 free_dhcpv6_assignment(a);
130 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
132 if (c->managed_sock.fd.registered) {
133 ustream_free(&c->managed_sock.stream);
134 close(c->managed_sock.fd.fd);
145 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
147 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
150 static size_t elect_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
154 for (i = 0, m = 0; i < addrlen; ++i) {
155 if (addrs[i].preferred > addrs[m].preferred ||
156 (addrs[i].preferred == addrs[m].preferred &&
157 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
164 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
167 struct dhcpv6_client_header hdr;
171 uint16_t hardware_type;
176 struct dhcpv6_auth_reconfigure auth;
179 uint8_t clid_data[128];
180 } __attribute__((packed)) reconf_msg = {
181 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
182 .srvid_type = htons(DHCPV6_OPT_SERVERID),
183 .srvid_len = htons(10),
184 .duid_type = htons(3),
185 .hardware_type = htons(1),
186 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
188 .msg_id = DHCPV6_MSG_RENEW,
189 .auth = {htons(DHCPV6_OPT_AUTH),
190 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
191 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
192 .clid_type = htons(DHCPV6_OPT_CLIENTID),
193 .clid_len = htons(assign->clid_len),
197 odhcpd_get_mac(iface, reconf_msg.mac);
198 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
199 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
202 uint8_t secretbytes[64];
203 memset(secretbytes, 0, sizeof(secretbytes));
204 memcpy(secretbytes, assign->key, sizeof(assign->key));
206 for (size_t i = 0; i < sizeof(secretbytes); ++i)
207 secretbytes[i] ^= 0x36;
210 md5_hash(secretbytes, sizeof(secretbytes), &md5);
211 md5_hash(iov.iov_base, iov.iov_len, &md5);
212 md5_end(reconf_msg.auth.key, &md5);
214 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
215 secretbytes[i] ^= 0x36;
216 secretbytes[i] ^= 0x5c;
220 md5_hash(secretbytes, sizeof(secretbytes), &md5);
221 md5_hash(reconf_msg.auth.key, 16, &md5);
222 md5_end(reconf_msg.auth.key, &md5);
224 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
227 void dhcpv6_write_statefile(void)
232 if (config.dhcp_statefile) {
233 time_t now = odhcpd_time(), wall_time = time(NULL);
234 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
238 lockf(fd, F_LOCK, 0);
239 if (ftruncate(fd, 0) < 0) {}
241 FILE *fp = fdopen(fd, "w");
247 struct interface *iface;
248 list_for_each_entry(iface, &interfaces, head) {
249 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
252 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
253 struct dhcpv6_assignment *c;
254 list_for_each_entry(c, &iface->ia_assignments, head) {
255 if (!(c->flags & OAF_BOUND) || c->managed_size < 0)
258 char ipbuf[INET6_ADDRSTRLEN];
261 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
263 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
264 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %ld %x %u ",
265 iface->ifname, duidbuf, ntohl(c->iaid),
266 (c->hostname ? c->hostname : "-"),
267 (c->valid_until > now ?
268 (c->valid_until - now + wall_time) :
269 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
270 c->assigned, (unsigned)c->length);
272 struct in6_addr addr;
273 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
274 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
275 size_t m = elect_addr(addrs, addrlen);
277 for (size_t i = 0; i < addrlen; ++i) {
278 if (!valid_addr(&addrs[i], now) || (!INFINITE_VALID(c->valid_until) && c->valid_until <= now) ||
279 (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
280 addrs[i].prefix <= 64))
283 addr = addrs[i].addr;
284 if (c->length == 128)
285 addr.s6_addr32[3] = htonl(c->assigned);
287 addr.s6_addr32[1] |= htonl(c->assigned);
289 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
291 if (c->length == 128 && c->hostname) {
295 if (dn_expand(iface->search, iface->search + iface->search_len,
296 iface->search, b, sizeof(b)) > 0)
297 fprintf(fp, "\t%s.%s", c->hostname, b);
299 fprintf(fp, "\t%s\n", c->hostname);
300 md5_hash(ipbuf, strlen(ipbuf), &md5);
301 md5_hash(c->hostname, strlen(c->hostname), &md5);
304 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%d ", ipbuf,
305 (c->managed_size) ? addrs[i].prefix : c->length);
307 leasebuf[l - 1] = '\n';
308 fwrite(leasebuf, 1, l, fp);
312 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
313 struct dhcpv4_assignment *c;
314 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
315 if (!(c->flags & OAF_BOUND))
318 char ipbuf[INET6_ADDRSTRLEN];
321 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
323 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
324 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %ld %x 32 ",
325 iface->ifname, duidbuf,
326 (c->hostname ? c->hostname : "-"),
327 (c->valid_until > now ?
328 (c->valid_until - now + wall_time) :
329 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
332 struct in_addr addr = {htonl(c->addr)};
333 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
339 if (dn_expand(iface->search, iface->search + iface->search_len,
340 iface->search, b, sizeof(b)) > 0)
341 fprintf(fp, "\t%s.%s", c->hostname, b);
343 fprintf(fp, "\t%s\n", c->hostname);
344 md5_hash(ipbuf, strlen(ipbuf), &md5);
345 md5_hash(c->hostname, strlen(c->hostname), &md5);
348 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
349 leasebuf[l - 1] = '\n';
350 fwrite(leasebuf, 1, l, fp);
359 md5_end(newmd5, &md5);
361 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
362 memcpy(statemd5, newmd5, sizeof(statemd5));
363 char *argv[2] = {config.dhcp_cb, NULL};
365 execv(argv[0], argv);
372 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
374 if (a->length > 64 || a->managed_size < 0)
377 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
378 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
380 for (size_t i = 0; i < addrlen; ++i) {
381 struct in6_addr prefix = addrs[i].addr;
382 prefix.s6_addr32[1] |= htonl(a->assigned);
383 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
384 iface, &a->peer.sin6_addr, 1024, add);
388 /* More data was received from TCP connection */
389 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
391 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
392 time_t now = odhcpd_time();
393 bool first = c->managed_size < 0;
397 char *data = ustream_get_read_buf(s, &pending);
398 char *end = memmem(data, pending, "\n\n", 2);
407 if (c->accept_reconf)
411 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
412 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
413 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
415 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
416 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
419 x = strtok_r(NULL, ",", &saveptr2);
420 if (sscanf(x, "%hhu", &n->prefix) < 1)
423 x = strtok_r(NULL, ",", &saveptr2);
424 if (sscanf(x, "%u", &n->preferred) < 1)
427 x = strtok_r(NULL, ",", &saveptr2);
428 if (sscanf(x, "%u", &n->valid) < 1)
431 if (n->preferred > n->valid)
434 if (UINT32_MAX - now < n->preferred)
435 n->preferred = UINT32_MAX;
439 if (UINT32_MAX - now < n->valid)
440 n->valid = UINT32_MAX;
449 ustream_consume(s, end - data);
452 if (first && c->managed_size == 0)
453 free_dhcpv6_assignment(c);
454 else if (first & !(c->flags & OAF_STATIC))
455 c->valid_until = now + 150;
459 /* TCP transmission has ended, either because of success or timeout or other error */
460 static void managed_handle_pd_done(struct ustream *s)
462 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
464 if (!(c->flags & OAF_STATIC))
465 c->valid_until = odhcpd_time() + 15;
469 if (c->accept_reconf)
473 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
475 struct dhcpv6_assignment *c;
477 if (iface->dhcpv6_pd_manager[0]) {
478 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
481 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
483 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
484 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
485 ustream_fd_init(&assign->managed_sock, fd);
486 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
487 iaidbuf, assign->iaid, assign->length);
488 ustream_write_pending(&assign->managed_sock.stream);
489 assign->managed_size = -1;
491 if (!(assign->flags & OAF_STATIC))
492 assign->valid_until = odhcpd_time() + 15;
494 list_add(&assign->head, &iface->ia_assignments);
496 /* Wait initial period of up to 250ms for immediate assignment */
497 struct pollfd pfd = { .fd = fd, .events = POLLIN };
499 managed_handle_pd_data(&assign->managed_sock.stream, 0);
501 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
506 } else if (iface->ia_addr_len < 1)
509 /* Try honoring the hint first */
510 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
511 if (assign->assigned) {
512 list_for_each_entry(c, &iface->ia_assignments, head) {
513 if (c->length == 128 || c->length == 0)
516 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
517 list_add_tail(&assign->head, &c->head);
518 apply_lease(iface, assign, true);
522 if (c->assigned != 0)
523 current = (c->assigned + (1 << (64 - c->length)));
527 /* Fallback to a variable assignment */
529 list_for_each_entry(c, &iface->ia_assignments, head) {
530 if (c->length == 128 || c->length == 0)
533 current = (current + asize) & (~asize);
534 if (current + asize < c->assigned) {
535 assign->assigned = current;
536 list_add_tail(&assign->head, &c->head);
537 apply_lease(iface, assign, true);
541 if (c->assigned != 0)
542 current = (c->assigned + (1 << (64 - c->length)));
548 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
550 /* Seed RNG with checksum of DUID */
552 for (size_t i = 0; i < assign->clid_len; ++i)
553 seed += assign->clid_data[i];
556 /* Try to assign up to 100x */
557 for (size_t i = 0; i < 100; ++i) {
559 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
561 struct dhcpv6_assignment *c;
562 list_for_each_entry(c, &iface->ia_assignments, head) {
566 if (c->assigned > try || c->length != 128) {
567 assign->assigned = try;
568 list_add_tail(&assign->head, &c->head);
570 } else if (c->assigned == try)
578 void dhcpv6_ia_preupdate(struct interface *iface)
580 if (iface->dhcpv6 != RELAYD_SERVER)
583 struct dhcpv6_assignment *c, *border = list_last_entry(
584 &iface->ia_assignments, struct dhcpv6_assignment, head);
586 list_for_each_entry(c, &iface->ia_assignments, head)
587 if (c != border && !iface->managed)
588 apply_lease(iface, c, false);
591 void dhcpv6_ia_postupdate(struct interface *iface, time_t now)
593 if (iface->dhcpv6 != RELAYD_SERVER)
597 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
598 if (iface->ia_addr[i].preferred > (uint32_t)now &&
599 iface->ia_addr[i].prefix < 64 &&
600 iface->ia_addr[i].prefix > minprefix)
601 minprefix = iface->ia_addr[i].prefix;
604 struct dhcpv6_assignment *border = list_last_entry(
605 &iface->ia_assignments, struct dhcpv6_assignment, head);
607 if (minprefix > 32 && minprefix <= 64)
608 border->assigned = 1U << (64 - minprefix);
610 border->assigned = 0;
612 struct list_head reassign = LIST_HEAD_INIT(reassign);
613 struct dhcpv6_assignment *c, *d;
614 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
615 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
619 if (c->length < 128 && c->assigned >= border->assigned && c != border)
620 list_move(&c->head, &reassign);
621 else if (c != border)
622 apply_lease(iface, c, true);
624 if (c->accept_reconf && c->reconf_cnt == 0) {
626 c->reconf_sent = now;
627 send_reconf(iface, c);
629 /* Leave all other assignments of that client alone */
630 struct dhcpv6_assignment *a;
631 list_for_each_entry(a, &iface->ia_assignments, head)
632 if (a != c && a->clid_len == c->clid_len &&
633 !memcmp(a->clid_data, c->clid_data, a->clid_len))
634 c->reconf_cnt = INT_MAX;
638 while (!list_empty(&reassign)) {
639 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
641 if (!assign_pd(iface, c)) {
643 list_add(&c->head, &iface->ia_assignments);
647 dhcpv6_write_statefile();
650 static void reconf_timer(struct uloop_timeout *event)
652 time_t now = odhcpd_time();
653 struct interface *iface;
654 list_for_each_entry(iface, &interfaces, head) {
655 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
658 struct dhcpv6_assignment *a, *n;
659 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
660 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
661 if ((a->length < 128 && a->clid_len > 0) ||
662 (a->length == 128 && a->clid_len == 0))
663 free_dhcpv6_assignment(a);
665 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
666 now > a->reconf_sent + (1 << a->reconf_cnt)) {
668 a->reconf_sent = now;
669 send_reconf(iface, a);
673 uloop_timeout_set(event, 2000);
676 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
677 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
678 struct interface *iface, bool request)
680 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
683 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
684 size_t datalen = sizeof(out);
685 time_t now = odhcpd_time();
688 struct __attribute__((packed)) {
692 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
695 memcpy(buf + datalen, &stat, sizeof(stat));
696 datalen += sizeof(stat);
700 if (a->leasetime > 0)
701 leasetime = a->leasetime;
703 leasetime = iface->dhcpv4_leasetime;
707 else if (leasetime < 60)
710 uint32_t pref = leasetime;
711 uint32_t valid = leasetime;
713 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
714 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
715 size_t m = elect_addr(addrs, addrlen);
717 for (size_t i = 0; i < addrlen; ++i) {
718 uint32_t prefix_pref = addrs[i].preferred;
719 uint32_t prefix_valid = addrs[i].valid;
721 if (!valid_addr(&addrs[i], now))
724 if (prefix_pref != UINT32_MAX)
727 if (prefix_valid != UINT32_MAX)
730 if (a->length < 128) {
731 struct dhcpv6_ia_prefix p = {
732 .type = htons(DHCPV6_OPT_IA_PREFIX),
733 .len = htons(sizeof(p) - 4),
734 .preferred = htonl(prefix_pref),
735 .valid = htonl(prefix_valid),
736 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
737 .addr = addrs[i].addr
739 p.addr.s6_addr32[1] |= htonl(a->assigned);
741 size_t entrlen = sizeof(p) - 4;
743 if (datalen + entrlen + 4 > buflen ||
744 (a->assigned == 0 && a->managed_size == 0) ||
745 (!a->managed_size && a->length <= addrs[i].prefix))
748 memcpy(buf + datalen, &p, sizeof(p));
749 datalen += entrlen + 4;
751 struct dhcpv6_ia_addr n = {
752 .type = htons(DHCPV6_OPT_IA_ADDR),
753 .len = htons(sizeof(n) - 4),
754 .addr = addrs[i].addr,
755 .preferred = htonl(prefix_pref),
756 .valid = htonl(prefix_valid)
758 n.addr.s6_addr32[3] = htonl(a->assigned);
759 size_t entrlen = sizeof(n) - 4;
761 if (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
762 addrs[i].prefix <= 64)
765 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
768 memcpy(buf + datalen, &n, sizeof(n));
769 datalen += entrlen + 4;
772 /* Calculate T1 / T2 based on non-deprecated addresses */
773 if (prefix_pref > 0) {
774 if (prefix_pref < pref)
777 if (prefix_valid < valid)
778 valid = prefix_valid;
782 if (!INFINITE_VALID(a->valid_until))
783 /* UINT32_MAX is considered as infinite leasetime */
784 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
786 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
787 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
797 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
798 uint16_t otype, olen;
799 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
800 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
801 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
802 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
803 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
808 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
809 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
811 for (size_t i = 0; i < addrlen; ++i) {
812 if (!valid_addr(&addrs[i], now))
815 struct in6_addr addr = addrs[i].addr;
816 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
817 addr.s6_addr32[1] |= htonl(a->assigned);
819 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
820 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
823 addr.s6_addr32[3] = htonl(a->assigned);
825 if (!memcmp(&n->addr, &addr, sizeof(addr)))
832 if (otype == DHCPV6_OPT_IA_PREFIX) {
833 struct dhcpv6_ia_prefix inv = {
834 .type = htons(DHCPV6_OPT_IA_PREFIX),
835 .len = htons(sizeof(inv) - 4),
842 if (datalen + sizeof(inv) > buflen)
845 memcpy(buf + datalen, &inv, sizeof(inv));
846 datalen += sizeof(inv);
848 struct dhcpv6_ia_addr inv = {
849 .type = htons(DHCPV6_OPT_IA_ADDR),
850 .len = htons(sizeof(inv) - 4),
856 if (datalen + sizeof(inv) > buflen)
859 memcpy(buf + datalen, &inv, sizeof(inv));
860 datalen += sizeof(inv);
867 out.len = htons(datalen - 4);
868 memcpy(buf, &out, sizeof(out));
872 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
873 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
875 const char *type = "UNKNOWN";
876 const char *status = "UNKNOWN";
878 if (msgtype == DHCPV6_MSG_RENEW)
882 case DHCPV6_MSG_SOLICIT:
885 case DHCPV6_MSG_REQUEST:
888 case DHCPV6_MSG_CONFIRM:
891 case DHCPV6_MSG_RENEW:
894 case DHCPV6_MSG_REBIND:
897 case DHCPV6_MSG_RELEASE:
900 case DHCPV6_MSG_DECLINE:
906 case DHCPV6_STATUS_OK:
909 case DHCPV6_STATUS_NOADDRSAVAIL:
910 status = "no addresses available";
912 case DHCPV6_STATUS_NOBINDING:
913 status = "no binding";
915 case DHCPV6_STATUS_NOTONLINK:
916 status = "not on-link";
918 case DHCPV6_STATUS_NOPREFIXAVAIL:
919 status = "no prefix available";
923 char leasebuf[256] = "";
926 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
927 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
929 char addrbuf[INET6_ADDRSTRLEN];
931 for (size_t i = 0; i < addrlen; ++i) {
932 if (!valid_addr(&addrs[i], now))
935 struct in6_addr addr = addrs[i].addr;
936 int prefix = a->managed ? addrs[i].prefix : a->length;
938 addr.s6_addr32[3] = htonl(a->assigned);
940 addr.s6_addr32[1] |= htonl(a->assigned);
942 inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
943 lbsize += snprintf(leasebuf + lbsize, sizeof(leasebuf) - lbsize, "%s/%d ", addrbuf, prefix);
947 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
948 duidbuf, iface->ifname, status, leasebuf);
951 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
952 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
954 time_t now = odhcpd_time();
955 size_t response_len = 0;
956 const struct dhcpv6_client_header *hdr = data;
957 uint8_t *start = (uint8_t*)&hdr[1], *odata;
958 uint16_t otype, olen;
959 /* Find and parse client-id and hostname */
960 bool accept_reconf = false;
961 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
963 size_t hostname_len = 0;
964 bool notonlink = false;
967 dhcpv6_for_each_option(start, end, otype, olen, odata) {
968 if (otype == DHCPV6_OPT_CLIENTID) {
972 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
973 memcpy(mac, &odata[8], sizeof(mac));
974 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
975 memcpy(mac, &odata[4], sizeof(mac));
978 odhcpd_hexlify(duidbuf, odata, olen);
979 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
980 uint8_t fqdn_buf[256];
981 memcpy(fqdn_buf, odata, olen);
982 fqdn_buf[olen++] = 0;
984 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
985 hostname_len = strcspn(hostname, ".");
986 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
987 accept_reconf = true;
990 if (!clid_data || !clid_len || clid_len > 130)
993 struct dhcpv6_assignment *first = NULL;
994 dhcpv6_for_each_option(start, end, otype, olen, odata) {
995 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
996 bool is_na = (otype == DHCPV6_OPT_IA_NA);
997 bool ia_addr_present = false;
998 if (!is_pd && !is_na)
1001 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1002 size_t ia_response_len = 0;
1003 uint8_t reqlen = (is_pd) ? 62 : 128;
1004 uint32_t reqhint = 0;
1006 /* Parse request hint for IA-PD */
1009 uint16_t stype, slen;
1010 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1011 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1014 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1017 reqhint = ntohl(p->addr.s6_addr32[1]);
1018 if (reqlen > 32 && reqlen <= 64)
1019 reqhint &= (1U << (64 - reqlen)) - 1;
1027 uint16_t stype, slen;
1028 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1029 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1032 ia_addr_present = true;
1036 /* Find assignment */
1037 struct dhcpv6_assignment *c, *a = NULL;
1038 list_for_each_entry(c, &iface->ia_assignments, head) {
1039 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1040 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1041 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1042 (c->iaid == ia->iaid || INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1043 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1047 apply_lease(iface, a, false);
1048 memcpy(a->clid_data, clid_data, clid_len);
1049 a->clid_len = clid_len;
1058 /* Generic message handling */
1059 uint16_t status = DHCPV6_STATUS_OK;
1060 if (a && a->managed_size < 0)
1063 if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
1064 bool assigned = !!a;
1066 if (!a && !iface->no_dynamic_dhcp) {
1067 /* Create new binding */
1068 a = calloc(1, sizeof(*a) + clid_len);
1070 a->clid_len = clid_len;
1074 a->assigned = reqhint;
1075 /* Set valid time to current time indicating */
1076 /* assignment is not having infinite lifetime */
1077 a->valid_until = now;
1080 memcpy(a->key, first->key, sizeof(a->key));
1082 odhcpd_urandom(a->key, sizeof(a->key));
1083 memcpy(a->clid_data, clid_data, clid_len);
1086 while (!(assigned = assign_pd(iface, a)) &&
1087 !a->managed_size && ++a->length <= 64);
1089 assigned = assign_na(iface, a);
1091 if (a->managed_size && !assigned)
1096 if (!assigned || iface->ia_addr_len == 0)
1097 /* Set error status */
1098 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1099 else if (assigned && !first) {
1100 size_t handshake_len = 4;
1102 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1106 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1107 struct dhcpv6_auth_reconfigure auth = {
1108 htons(DHCPV6_OPT_AUTH),
1109 htons(sizeof(auth) - 4),
1111 {htonl(time(NULL)), htonl(++serial)},
1115 memcpy(auth.key, a->key, sizeof(a->key));
1116 memcpy(buf + handshake_len, &auth, sizeof(auth));
1117 handshake_len += sizeof(auth);
1120 buf += handshake_len;
1121 buflen -= handshake_len;
1122 response_len += handshake_len;
1127 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1129 /* Was only a solicitation: mark binding for removal */
1130 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1131 a->flags &= ~OAF_BOUND;
1133 if (!(a->flags & OAF_STATIC))
1134 a->valid_until = now;
1135 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
1136 if (hostname_len > 0) {
1137 a->hostname = realloc(a->hostname, hostname_len + 1);
1139 memcpy(a->hostname, hostname, hostname_len);
1140 a->hostname[hostname_len] = 0;
1143 a->accept_reconf = accept_reconf;
1144 a->flags |= OAF_BOUND;
1145 apply_lease(iface, a, true);
1146 } else if (!assigned && a && a->managed_size == 0)
1147 /* Cleanup failed assignment */
1148 free_dhcpv6_assignment(a);
1150 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1151 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1152 hdr->msg_type == DHCPV6_MSG_REBIND ||
1153 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1154 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1155 status = DHCPV6_STATUS_NOBINDING;
1156 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1157 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1158 hdr->msg_type == DHCPV6_MSG_REBIND) {
1159 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1161 a->flags |= OAF_BOUND;
1162 apply_lease(iface, a, true);
1164 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1165 if (!(a->flags & OAF_STATIC))
1166 a->valid_until = now - 1;
1168 a->flags &= ~OAF_BOUND;
1169 apply_lease(iface, a, false);
1170 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1171 a->flags &= ~OAF_BOUND;
1173 if (!(a->flags & OAF_STATIC)) {
1175 a->valid_until = now + 3600; /* Block address for 1h */
1178 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1179 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1180 status = DHCPV6_STATUS_NOTONLINK;
1181 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1185 buf += ia_response_len;
1186 buflen -= ia_response_len;
1187 response_len += ia_response_len;
1188 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1191 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1192 response_len + 6 < buflen) {
1194 buf[1] = DHCPV6_OPT_STATUS;
1198 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1202 dhcpv6_write_statefile();
1205 return response_len;