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>
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);
92 // Parse static entries
94 list_for_each_entry(lease, &leases, head) {
96 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
97 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
99 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
104 if (lease->dhcpv4_leasetime > 0)
105 a->leasetime = lease->dhcpv4_leasetime;
107 a->clid_len = duid_len;
110 a->assigned = lease->hostid;
112 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
113 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
115 odhcpd_urandom(a->key, sizeof(a->key));
116 memcpy(a->clid_data, lease->duid, lease->duid_len);
117 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
118 /* Static assignment */
119 a->flags |= OAF_STATIC;
123 // Assign to all interfaces
124 struct dhcpv6_assignment *c;
125 list_for_each_entry(c, &iface->ia_assignments, head) {
126 if (c->length != 128 || c->assigned > a->assigned) {
127 list_add_tail(&a->head, &c->head);
129 } else if (c->assigned == a->assigned) {
130 // Already an assignment with that number
136 if (lease->hostname[0]) {
138 a->hostname = strdup(lease->hostname);
150 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
153 struct dhcpv6_client_header hdr;
157 uint16_t hardware_type;
162 struct dhcpv6_auth_reconfigure auth;
165 uint8_t clid_data[128];
166 } __attribute__((packed)) reconf_msg = {
167 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
168 .srvid_type = htons(DHCPV6_OPT_SERVERID),
169 .srvid_len = htons(10),
170 .duid_type = htons(3),
171 .hardware_type = htons(1),
172 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
174 .msg_id = DHCPV6_MSG_RENEW,
175 .auth = {htons(DHCPV6_OPT_AUTH),
176 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
177 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
178 .clid_type = htons(DHCPV6_OPT_CLIENTID),
179 .clid_len = htons(assign->clid_len),
183 odhcpd_get_mac(iface, reconf_msg.mac);
184 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
185 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
188 uint8_t secretbytes[64];
189 memset(secretbytes, 0, sizeof(secretbytes));
190 memcpy(secretbytes, assign->key, sizeof(assign->key));
192 for (size_t i = 0; i < sizeof(secretbytes); ++i)
193 secretbytes[i] ^= 0x36;
196 md5_hash(secretbytes, sizeof(secretbytes), &md5);
197 md5_hash(iov.iov_base, iov.iov_len, &md5);
198 md5_end(reconf_msg.auth.key, &md5);
200 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
201 secretbytes[i] ^= 0x36;
202 secretbytes[i] ^= 0x5c;
206 md5_hash(secretbytes, sizeof(secretbytes), &md5);
207 md5_hash(reconf_msg.auth.key, 16, &md5);
208 md5_end(reconf_msg.auth.key, &md5);
210 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
214 void dhcpv6_write_statefile(void)
219 if (config.dhcp_statefile) {
220 time_t now = odhcpd_time(), wall_time = time(NULL);
221 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
225 lockf(fd, F_LOCK, 0);
226 if (ftruncate(fd, 0) < 0) {}
228 FILE *fp = fdopen(fd, "w");
234 struct interface *iface;
235 list_for_each_entry(iface, &interfaces, head) {
236 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
239 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
240 struct dhcpv6_assignment *c;
241 list_for_each_entry(c, &iface->ia_assignments, head) {
242 if (!(c->flags & OAF_BOUND) || c->managed_size < 0)
245 char ipbuf[INET6_ADDRSTRLEN];
248 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
250 // iface DUID iaid hostname lifetime assigned length [addrs...]
251 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %ld %x %u ",
252 iface->ifname, duidbuf, ntohl(c->iaid),
253 (c->hostname ? c->hostname : "-"),
254 (c->valid_until > now ?
255 (c->valid_until - now + wall_time) :
256 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
257 c->assigned, (unsigned)c->length);
259 struct in6_addr addr;
260 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
261 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
264 for (size_t i = 0; i < addrlen; ++i)
265 if (addrs[i].preferred > addrs[m].preferred ||
266 (addrs[i].preferred == addrs[m].preferred &&
267 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
270 for (size_t i = 0; i < addrlen; ++i) {
271 if (addrs[i].prefix > 96 || (!INFINITE_VALID(c->valid_until) && c->valid_until <= now) ||
272 (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
273 addrs[i].prefix == 64))
276 addr = addrs[i].addr;
277 if (c->length == 128)
278 addr.s6_addr32[3] = htonl(c->assigned);
280 addr.s6_addr32[1] |= htonl(c->assigned);
282 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
284 if (c->length == 128 && c->hostname) {
288 if (dn_expand(iface->search, iface->search + iface->search_len,
289 iface->search, b, sizeof(b)) > 0)
290 fprintf(fp, "\t%s.%s", c->hostname, b);
292 fprintf(fp, "\t%s\n", c->hostname);
293 md5_hash(ipbuf, strlen(ipbuf), &md5);
294 md5_hash(c->hostname, strlen(c->hostname), &md5);
297 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%d ", ipbuf,
298 (c->managed_size) ? addrs[i].prefix : c->length);
300 leasebuf[l - 1] = '\n';
301 fwrite(leasebuf, 1, l, fp);
305 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
306 struct dhcpv4_assignment *c;
307 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
308 if (!(c->flags & OAF_BOUND))
311 char ipbuf[INET6_ADDRSTRLEN];
314 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
316 // iface DUID iaid hostname lifetime assigned length [addrs...]
317 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %ld %x 32 ",
318 iface->ifname, duidbuf,
319 (c->hostname ? c->hostname : "-"),
320 (c->valid_until > now ?
321 (c->valid_until - now + wall_time) :
322 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
325 struct in_addr addr = {htonl(c->addr)};
326 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
332 if (dn_expand(iface->search, iface->search + iface->search_len,
333 iface->search, b, sizeof(b)) > 0)
334 fprintf(fp, "\t%s.%s", c->hostname, b);
336 fprintf(fp, "\t%s\n", c->hostname);
337 md5_hash(ipbuf, strlen(ipbuf), &md5);
338 md5_hash(c->hostname, strlen(c->hostname), &md5);
341 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
342 leasebuf[l - 1] = '\n';
343 fwrite(leasebuf, 1, l, fp);
352 md5_end(newmd5, &md5);
354 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
355 memcpy(statemd5, newmd5, sizeof(statemd5));
356 char *argv[2] = {config.dhcp_cb, NULL};
358 execv(argv[0], argv);
365 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
367 if (a->length > 64 || a->managed_size < 0)
370 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
371 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
373 for (size_t i = 0; i < addrlen; ++i) {
374 struct in6_addr prefix = addrs[i].addr;
375 prefix.s6_addr32[1] |= htonl(a->assigned);
376 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
377 iface, &a->peer.sin6_addr, 1024, add);
382 // More data was received from TCP connection
383 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
385 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
386 time_t now = odhcpd_time();
387 bool first = c->managed_size < 0;
391 char *data = ustream_get_read_buf(s, &pending);
392 char *end = memmem(data, pending, "\n\n", 2);
401 if (c->accept_reconf)
405 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
406 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
407 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
409 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
410 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
413 x = strtok_r(NULL, ",", &saveptr2);
414 if (sscanf(x, "%hhu", &n->prefix) < 1)
417 x = strtok_r(NULL, ",", &saveptr2);
418 if (sscanf(x, "%u", &n->preferred) < 1)
421 x = strtok_r(NULL, ",", &saveptr2);
422 if (sscanf(x, "%u", &n->valid) < 1)
425 if (n->preferred > n->valid)
428 if (UINT32_MAX - now < n->preferred)
429 n->preferred = UINT32_MAX;
433 if (UINT32_MAX - now < n->valid)
434 n->valid = UINT32_MAX;
443 ustream_consume(s, end - data);
446 if (first && c->managed_size == 0)
447 free_dhcpv6_assignment(c);
449 c->valid_until = now + 150;
453 // TCP transmission has ended, either because of success or timeout or other error
454 static void managed_handle_pd_done(struct ustream *s)
456 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
457 c->valid_until = odhcpd_time() + 15;
459 if (c->accept_reconf)
465 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
467 struct dhcpv6_assignment *c;
469 if (iface->dhcpv6_pd_manager[0]) {
470 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
473 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
475 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
476 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
477 ustream_fd_init(&assign->managed_sock, fd);
478 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
479 iaidbuf, assign->iaid, assign->length);
480 ustream_write_pending(&assign->managed_sock.stream);
481 assign->managed_size = -1;
482 assign->valid_until = odhcpd_time() + 15;
483 list_add(&assign->head, &iface->ia_assignments);
485 // Wait initial period of up to 250ms for immediate assignment
486 struct pollfd pfd = { .fd = fd, .events = POLLIN };
488 managed_handle_pd_data(&assign->managed_sock.stream, 0);
490 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
495 } else if (iface->ia_addr_len < 1) {
499 // Try honoring the hint first
500 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
501 if (assign->assigned) {
502 list_for_each_entry(c, &iface->ia_assignments, head) {
503 if (c->length == 128 || c->length == 0)
506 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
507 list_add_tail(&assign->head, &c->head);
508 apply_lease(iface, assign, true);
512 if (c->assigned != 0)
513 current = (c->assigned + (1 << (64 - c->length)));
517 // Fallback to a variable assignment
519 list_for_each_entry(c, &iface->ia_assignments, head) {
520 if (c->length == 128 || c->length == 0)
523 current = (current + asize) & (~asize);
524 if (current + asize < c->assigned) {
525 assign->assigned = current;
526 list_add_tail(&assign->head, &c->head);
527 apply_lease(iface, assign, true);
531 if (c->assigned != 0)
532 current = (c->assigned + (1 << (64 - c->length)));
539 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
541 // Seed RNG with checksum of DUID
543 for (size_t i = 0; i < assign->clid_len; ++i)
544 seed += assign->clid_data[i];
547 // Try to assign up to 100x
548 for (size_t i = 0; i < 100; ++i) {
550 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
552 struct dhcpv6_assignment *c;
553 list_for_each_entry(c, &iface->ia_assignments, head) {
557 if (c->assigned > try || c->length != 128) {
558 assign->assigned = try;
559 list_add_tail(&assign->head, &c->head);
561 } else if (c->assigned == try) {
570 void dhcpv6_ia_preupdate(struct interface *iface)
572 if (iface->dhcpv6 != RELAYD_SERVER)
575 struct dhcpv6_assignment *c, *border = list_last_entry(
576 &iface->ia_assignments, struct dhcpv6_assignment, head);
577 list_for_each_entry(c, &iface->ia_assignments, head)
578 if (c != border && !iface->managed)
579 apply_lease(iface, c, false);
582 void dhcpv6_ia_postupdate(struct interface *iface, time_t now)
584 if (iface->dhcpv6 != RELAYD_SERVER)
588 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
589 if (iface->ia_addr[i].preferred > (uint32_t)now &&
590 iface->ia_addr[i].prefix < 64 &&
591 iface->ia_addr[i].prefix > minprefix)
592 minprefix = iface->ia_addr[i].prefix;
595 struct dhcpv6_assignment *border = list_last_entry(
596 &iface->ia_assignments, struct dhcpv6_assignment, head);
597 if (minprefix > 32 && minprefix <= 64)
598 border->assigned = 1U << (64 - minprefix);
600 border->assigned = 0;
602 struct list_head reassign = LIST_HEAD_INIT(reassign);
603 struct dhcpv6_assignment *c, *d;
604 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
605 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
609 if (c->length < 128 && c->assigned >= border->assigned && c != border)
610 list_move(&c->head, &reassign);
611 else if (c != border)
612 apply_lease(iface, c, true);
614 if (c->accept_reconf && c->reconf_cnt == 0) {
616 c->reconf_sent = now;
617 send_reconf(iface, c);
619 // Leave all other assignments of that client alone
620 struct dhcpv6_assignment *a;
621 list_for_each_entry(a, &iface->ia_assignments, head)
622 if (a != c && a->clid_len == c->clid_len &&
623 !memcmp(a->clid_data, c->clid_data, a->clid_len))
624 c->reconf_cnt = INT_MAX;
628 while (!list_empty(&reassign)) {
629 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
631 if (!assign_pd(iface, c)) {
633 list_add(&c->head, &iface->ia_assignments);
637 dhcpv6_write_statefile();
641 static void reconf_timer(struct uloop_timeout *event)
643 time_t now = odhcpd_time();
644 struct interface *iface;
645 list_for_each_entry(iface, &interfaces, head) {
646 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
649 struct dhcpv6_assignment *a, *n;
650 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
651 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
652 if ((a->length < 128 && a->clid_len > 0) ||
653 (a->length == 128 && a->clid_len == 0)) {
655 free_dhcpv6_assignment(a);
657 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
658 now > a->reconf_sent + (1 << a->reconf_cnt)) {
660 a->reconf_sent = now;
661 send_reconf(iface, a);
665 uloop_timeout_set(event, 2000);
669 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
670 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
671 struct interface *iface, bool request)
673 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
676 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
677 size_t datalen = sizeof(out);
678 time_t now = odhcpd_time();
681 struct __attribute__((packed)) {
685 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
688 memcpy(buf + datalen, &stat, sizeof(stat));
689 datalen += sizeof(stat);
693 if (a->leasetime > 0) {
694 leasetime = a->leasetime;
696 leasetime = iface->dhcpv4_leasetime;
700 else if (leasetime < 60)
703 uint32_t pref = leasetime;
704 uint32_t valid = leasetime;
706 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
707 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
710 for (size_t i = 0; i < addrlen; ++i)
711 if (addrs[i].preferred > addrs[m].preferred ||
712 (addrs[i].preferred == addrs[m].preferred &&
713 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
716 for (size_t i = 0; i < addrlen; ++i) {
717 uint32_t prefix_pref = addrs[i].preferred;
718 uint32_t prefix_valid = addrs[i].valid;
720 if (addrs[i].prefix > 96 ||
721 addrs[i].preferred <= (uint32_t)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 (addrs[i].prefix > 96 ||
813 addrs[i].preferred <= (uint32_t)now)
816 struct in6_addr addr = addrs[i].addr;
817 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
818 addr.s6_addr32[1] |= htonl(a->assigned);
820 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
821 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
824 addr.s6_addr32[3] = htonl(a->assigned);
826 if (!memcmp(&n->addr, &addr, sizeof(addr)))
833 if (otype == DHCPV6_OPT_IA_PREFIX) {
834 struct dhcpv6_ia_prefix inv = {
835 .type = htons(DHCPV6_OPT_IA_PREFIX),
836 .len = htons(sizeof(inv) - 4),
843 if (datalen + sizeof(inv) > buflen)
846 memcpy(buf + datalen, &inv, sizeof(inv));
847 datalen += sizeof(inv);
849 struct dhcpv6_ia_addr inv = {
850 .type = htons(DHCPV6_OPT_IA_ADDR),
851 .len = htons(sizeof(inv) - 4),
857 if (datalen + sizeof(inv) > buflen)
860 memcpy(buf + datalen, &inv, sizeof(inv));
861 datalen += sizeof(inv);
868 out.len = htons(datalen - 4);
869 memcpy(buf, &out, sizeof(out));
874 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
875 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
877 const char *type = "UNKNOWN";
878 const char *status = "UNKNOWN";
880 if (msgtype == DHCPV6_MSG_RENEW)
884 case DHCPV6_MSG_SOLICIT:
887 case DHCPV6_MSG_REQUEST:
890 case DHCPV6_MSG_CONFIRM:
893 case DHCPV6_MSG_RENEW:
896 case DHCPV6_MSG_REBIND:
899 case DHCPV6_MSG_RELEASE:
902 case DHCPV6_MSG_DECLINE:
908 case DHCPV6_STATUS_OK:
911 case DHCPV6_STATUS_NOADDRSAVAIL:
912 status = "no addresses available";
914 case DHCPV6_STATUS_NOBINDING:
915 status = "no binding";
917 case DHCPV6_STATUS_NOTONLINK:
918 status = "not on-link";
920 case DHCPV6_STATUS_NOPREFIXAVAIL:
921 status = "no prefix available";
925 char leasebuf[256] = "";
928 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
929 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
931 char addrbuf[INET6_ADDRSTRLEN];
933 for (size_t i = 0; i < addrlen; ++i) {
934 if (addrs[i].prefix > 96 || addrs[i].preferred <= (uint32_t)now)
937 struct in6_addr addr = addrs[i].addr;
938 int prefix = a->managed ? addrs[i].prefix : a->length;
940 addr.s6_addr32[3] = htonl(a->assigned);
942 addr.s6_addr32[1] |= htonl(a->assigned);
944 inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
945 lbsize += snprintf(leasebuf + lbsize, sizeof(leasebuf) - lbsize, "%s/%d ", addrbuf, prefix);
949 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
950 duidbuf, iface->ifname, status, leasebuf);
955 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
956 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
958 time_t now = odhcpd_time();
959 size_t response_len = 0;
960 const struct dhcpv6_client_header *hdr = data;
961 uint8_t *start = (uint8_t*)&hdr[1], *odata;
962 uint16_t otype, olen;
964 // Find and parse client-id and hostname
965 bool accept_reconf = false;
966 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
968 size_t hostname_len = 0;
969 bool notonlink = false;
972 dhcpv6_for_each_option(start, end, otype, olen, odata) {
973 if (otype == DHCPV6_OPT_CLIENTID) {
977 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
978 memcpy(mac, &odata[8], sizeof(mac));
979 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
980 memcpy(mac, &odata[4], sizeof(mac));
983 odhcpd_hexlify(duidbuf, odata, olen);
984 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
985 uint8_t fqdn_buf[256];
986 memcpy(fqdn_buf, odata, olen);
987 fqdn_buf[olen++] = 0;
989 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
990 hostname_len = strcspn(hostname, ".");
991 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
992 accept_reconf = true;
996 if (!clid_data || !clid_len || clid_len > 130)
999 struct dhcpv6_assignment *first = NULL;
1000 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1001 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1002 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1003 bool ia_addr_present = false;
1004 if (!is_pd && !is_na)
1007 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1008 size_t ia_response_len = 0;
1009 uint8_t reqlen = (is_pd) ? 62 : 128;
1010 uint32_t reqhint = 0;
1012 // Parse request hint for IA-PD
1015 uint16_t stype, slen;
1016 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1017 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1020 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1023 reqhint = ntohl(p->addr.s6_addr32[1]);
1024 if (reqlen > 32 && reqlen <= 64)
1025 reqhint &= (1U << (64 - reqlen)) - 1;
1033 uint16_t stype, slen;
1034 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1035 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1038 ia_addr_present = true;
1043 struct dhcpv6_assignment *c, *a = NULL;
1044 list_for_each_entry(c, &iface->ia_assignments, head) {
1045 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1046 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1047 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1048 (c->iaid == ia->iaid || INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1049 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1053 apply_lease(iface, a, false);
1054 memcpy(a->clid_data, clid_data, clid_len);
1055 a->clid_len = clid_len;
1064 // Generic message handling
1065 uint16_t status = DHCPV6_STATUS_OK;
1066 if (a && a->managed_size < 0) {
1068 } else if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
1069 bool assigned = !!a;
1071 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
1072 a = calloc(1, sizeof(*a) + clid_len);
1074 a->clid_len = clid_len;
1078 a->assigned = reqhint;
1079 // Set valid time to current time indicating
1080 // assignment is not having infinite lifetime
1081 a->valid_until = now;
1084 memcpy(a->key, first->key, sizeof(a->key));
1086 odhcpd_urandom(a->key, sizeof(a->key));
1087 memcpy(a->clid_data, clid_data, clid_len);
1090 while (!(assigned = assign_pd(iface, a)) &&
1091 !a->managed_size && ++a->length <= 64);
1093 assigned = assign_na(iface, a);
1095 if (a->managed_size && !assigned)
1100 if (!assigned || iface->ia_addr_len == 0) { // Set error status
1101 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1102 } else if (assigned && !first) { //
1103 size_t handshake_len = 4;
1105 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1109 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1110 struct dhcpv6_auth_reconfigure auth = {
1111 htons(DHCPV6_OPT_AUTH),
1112 htons(sizeof(auth) - 4),
1114 {htonl(time(NULL)), htonl(++serial)},
1118 memcpy(auth.key, a->key, sizeof(a->key));
1119 memcpy(buf + handshake_len, &auth, sizeof(auth));
1120 handshake_len += sizeof(auth);
1123 buf += handshake_len;
1124 buflen -= handshake_len;
1125 response_len += handshake_len;
1130 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1132 // Was only a solicitation: mark binding for removal
1133 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1134 a->flags &= ~OAF_BOUND;
1136 if (!(a->flags & OAF_STATIC))
1137 a->valid_until = now;
1138 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
1139 if (hostname_len > 0) {
1140 a->hostname = realloc(a->hostname, hostname_len + 1);
1142 memcpy(a->hostname, hostname, hostname_len);
1143 a->hostname[hostname_len] = 0;
1146 a->accept_reconf = accept_reconf;
1147 a->flags |= OAF_BOUND;
1148 apply_lease(iface, a, true);
1149 } else if (!assigned && a && a->managed_size == 0) { // Cleanup failed assignment
1150 free_dhcpv6_assignment(a);
1152 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1153 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1154 hdr->msg_type == DHCPV6_MSG_REBIND ||
1155 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1156 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1157 status = DHCPV6_STATUS_NOBINDING;
1158 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1159 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1160 hdr->msg_type == DHCPV6_MSG_REBIND) {
1161 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1163 a->flags |= OAF_BOUND;
1164 apply_lease(iface, a, true);
1166 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1167 if (!(a->flags & OAF_STATIC))
1168 a->valid_until = now - 1;
1170 a->flags &= ~OAF_BOUND;
1171 apply_lease(iface, a, false);
1172 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1173 a->flags &= ~OAF_BOUND;
1175 if (!(a->flags & OAF_STATIC)) {
1177 a->valid_until = now + 3600; // Block address for 1h
1180 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1181 // Send NOTONLINK for CONFIRM with addr present so that clients restart connection
1182 status = DHCPV6_STATUS_NOTONLINK;
1183 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1187 buf += ia_response_len;
1188 buflen -= ia_response_len;
1189 response_len += ia_response_len;
1190 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1193 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1194 response_len + 6 < buflen) {
1196 buf[1] = DHCPV6_OPT_STATUS;
1200 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1204 dhcpv6_write_statefile();
1207 return response_len;