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 #define ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) \
38 ((iface)->managed == RELAYD_MANAGED_NO_AFLAG || (i) == (m) || \
39 (addrs)[(i)].prefix > 64)
41 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c);
42 static void reconf_timer(struct uloop_timeout *event);
43 static struct uloop_timeout reconf_event = {.cb = reconf_timer};
44 static uint32_t serial = 0;
45 static uint8_t statemd5[16];
47 int dhcpv6_ia_init(void)
49 uloop_timeout_set(&reconf_event, 2000);
53 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
55 if (!enable && iface->ia_assignments.next) {
56 struct dhcpv6_assignment *c;
58 while (!list_empty(&iface->ia_assignments)) {
59 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
60 free_dhcpv6_assignment(c);
64 if (enable && iface->dhcpv6 == RELAYD_SERVER) {
65 if (!iface->ia_assignments.next)
66 INIT_LIST_HEAD(&iface->ia_assignments);
68 if (list_empty(&iface->ia_assignments)) {
69 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
71 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
76 list_add(&border->head, &iface->ia_assignments);
79 /* Parse static entries */
81 list_for_each_entry(lease, &leases, head) {
83 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
84 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
86 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
91 a->leasetime = lease->dhcpv4_leasetime;
93 a->clid_len = duid_len;
96 a->assigned = lease->hostid;
98 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
99 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
102 odhcpd_urandom(a->key, sizeof(a->key));
103 memcpy(a->clid_data, lease->duid, lease->duid_len);
104 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
105 /* Static assignment */
106 a->flags |= OAF_STATIC;
110 /* Assign to all interfaces */
111 struct dhcpv6_assignment *c;
112 list_for_each_entry(c, &iface->ia_assignments, head) {
113 if (c->length != 128 || c->assigned > a->assigned) {
114 list_add_tail(&a->head, &c->head);
116 } else if (c->assigned == a->assigned)
117 /* Already an assignment with that number */
122 if (lease->hostname[0]) {
124 a->hostname = strdup(lease->hostname);
127 free_dhcpv6_assignment(a);
133 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
135 if (c->managed_sock.fd.registered) {
136 ustream_free(&c->managed_sock.stream);
137 close(c->managed_sock.fd.fd);
148 static inline bool valid_prefix_length(const struct dhcpv6_assignment *a, const uint8_t prefix_length)
150 return (a->managed_size || a->length > prefix_length);
153 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
155 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
158 static size_t elect_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
162 for (i = 0, m = 0; i < addrlen; ++i) {
163 if (addrs[i].preferred > addrs[m].preferred ||
164 (addrs[i].preferred == addrs[m].preferred &&
165 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
172 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
175 struct dhcpv6_client_header hdr;
179 uint16_t hardware_type;
184 struct dhcpv6_auth_reconfigure auth;
187 uint8_t clid_data[128];
188 } __attribute__((packed)) reconf_msg = {
189 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
190 .srvid_type = htons(DHCPV6_OPT_SERVERID),
191 .srvid_len = htons(10),
192 .duid_type = htons(3),
193 .hardware_type = htons(1),
194 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
196 .msg_id = DHCPV6_MSG_RENEW,
197 .auth = {htons(DHCPV6_OPT_AUTH),
198 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
199 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
200 .clid_type = htons(DHCPV6_OPT_CLIENTID),
201 .clid_len = htons(assign->clid_len),
205 odhcpd_get_mac(iface, reconf_msg.mac);
206 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
207 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
210 uint8_t secretbytes[64];
211 memset(secretbytes, 0, sizeof(secretbytes));
212 memcpy(secretbytes, assign->key, sizeof(assign->key));
214 for (size_t i = 0; i < sizeof(secretbytes); ++i)
215 secretbytes[i] ^= 0x36;
218 md5_hash(secretbytes, sizeof(secretbytes), &md5);
219 md5_hash(iov.iov_base, iov.iov_len, &md5);
220 md5_end(reconf_msg.auth.key, &md5);
222 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
223 secretbytes[i] ^= 0x36;
224 secretbytes[i] ^= 0x5c;
228 md5_hash(secretbytes, sizeof(secretbytes), &md5);
229 md5_hash(reconf_msg.auth.key, 16, &md5);
230 md5_end(reconf_msg.auth.key, &md5);
232 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
235 void dhcpv6_write_statefile(void)
240 if (config.dhcp_statefile) {
241 time_t now = odhcpd_time(), wall_time = time(NULL);
242 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
246 lockf(fd, F_LOCK, 0);
247 if (ftruncate(fd, 0) < 0) {}
249 FILE *fp = fdopen(fd, "w");
255 struct interface *iface;
256 list_for_each_entry(iface, &interfaces, head) {
257 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
260 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
261 struct dhcpv6_assignment *c;
262 list_for_each_entry(c, &iface->ia_assignments, head) {
263 if (!(c->flags & OAF_BOUND) || c->managed_size < 0)
266 char ipbuf[INET6_ADDRSTRLEN];
269 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
271 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
272 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %ld %x %u ",
273 iface->ifname, duidbuf, ntohl(c->iaid),
274 (c->hostname ? c->hostname : "-"),
275 (c->valid_until > now ?
276 (c->valid_until - now + wall_time) :
277 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
278 c->assigned, (unsigned)c->length);
280 struct in6_addr addr;
281 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
282 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
283 size_t m = elect_addr(addrs, addrlen);
285 for (size_t i = 0; i < addrlen; ++i) {
286 if (!valid_addr(&addrs[i], now) ||
287 (!INFINITE_VALID(c->valid_until) && c->valid_until <= now))
290 addr = addrs[i].addr;
291 if (c->length == 128) {
292 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
295 addr.s6_addr32[3] = htonl(c->assigned);
298 if (!valid_prefix_length(c, addrs[i].prefix))
301 addr.s6_addr32[1] |= htonl(c->assigned);
304 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
306 if (c->length == 128 && c->hostname) {
310 if (dn_expand(iface->search, iface->search + iface->search_len,
311 iface->search, b, sizeof(b)) > 0)
312 fprintf(fp, "\t%s.%s", c->hostname, b);
314 fprintf(fp, "\t%s\n", c->hostname);
315 md5_hash(ipbuf, strlen(ipbuf), &md5);
316 md5_hash(c->hostname, strlen(c->hostname), &md5);
319 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%d ", ipbuf,
320 (c->managed_size) ? addrs[i].prefix : c->length);
322 leasebuf[l - 1] = '\n';
323 fwrite(leasebuf, 1, l, fp);
327 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
328 struct dhcpv4_assignment *c;
329 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
330 if (!(c->flags & OAF_BOUND))
333 char ipbuf[INET6_ADDRSTRLEN];
336 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
338 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
339 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %ld %x 32 ",
340 iface->ifname, duidbuf,
341 (c->hostname ? c->hostname : "-"),
342 (c->valid_until > now ?
343 (c->valid_until - now + wall_time) :
344 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
347 struct in_addr addr = {htonl(c->addr)};
348 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
354 if (dn_expand(iface->search, iface->search + iface->search_len,
355 iface->search, b, sizeof(b)) > 0)
356 fprintf(fp, "\t%s.%s", c->hostname, b);
358 fprintf(fp, "\t%s\n", c->hostname);
359 md5_hash(ipbuf, strlen(ipbuf), &md5);
360 md5_hash(c->hostname, strlen(c->hostname), &md5);
363 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
364 leasebuf[l - 1] = '\n';
365 fwrite(leasebuf, 1, l, fp);
374 md5_end(newmd5, &md5);
376 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
377 memcpy(statemd5, newmd5, sizeof(statemd5));
378 char *argv[2] = {config.dhcp_cb, NULL};
380 execv(argv[0], argv);
387 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
389 if (a->length > 64 || a->managed_size < 0)
392 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
393 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
395 for (size_t i = 0; i < addrlen; ++i) {
396 struct in6_addr prefix = addrs[i].addr;
397 prefix.s6_addr32[1] |= htonl(a->assigned);
398 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
399 iface, &a->peer.sin6_addr, 1024, add);
403 /* More data was received from TCP connection */
404 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
406 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
407 time_t now = odhcpd_time();
408 bool first = c->managed_size < 0;
412 char *data = ustream_get_read_buf(s, &pending);
413 char *end = memmem(data, pending, "\n\n", 2);
422 if (c->accept_reconf)
426 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
427 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
428 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
430 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
431 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
434 x = strtok_r(NULL, ",", &saveptr2);
435 if (sscanf(x, "%hhu", &n->prefix) < 1)
438 x = strtok_r(NULL, ",", &saveptr2);
439 if (sscanf(x, "%u", &n->preferred) < 1)
442 x = strtok_r(NULL, ",", &saveptr2);
443 if (sscanf(x, "%u", &n->valid) < 1)
446 if (n->preferred > n->valid)
449 if (UINT32_MAX - now < n->preferred)
450 n->preferred = UINT32_MAX;
454 if (UINT32_MAX - now < n->valid)
455 n->valid = UINT32_MAX;
464 ustream_consume(s, end - data);
467 if (first && c->managed_size == 0)
468 free_dhcpv6_assignment(c);
469 else if (first && !(c->flags & OAF_STATIC))
470 c->valid_until = now + 150;
474 /* TCP transmission has ended, either because of success or timeout or other error */
475 static void managed_handle_pd_done(struct ustream *s)
477 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
479 if (!(c->flags & OAF_STATIC))
480 c->valid_until = odhcpd_time() + 15;
484 if (c->accept_reconf)
488 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
490 struct dhcpv6_assignment *c;
492 if (iface->dhcpv6_pd_manager[0]) {
493 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
496 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
498 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
499 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
500 ustream_fd_init(&assign->managed_sock, fd);
501 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
502 iaidbuf, assign->iaid, assign->length);
503 ustream_write_pending(&assign->managed_sock.stream);
504 assign->managed_size = -1;
506 if (!(assign->flags & OAF_STATIC))
507 assign->valid_until = odhcpd_time() + 15;
509 list_add(&assign->head, &iface->ia_assignments);
511 /* Wait initial period of up to 250ms for immediate assignment */
512 struct pollfd pfd = { .fd = fd, .events = POLLIN };
514 managed_handle_pd_data(&assign->managed_sock.stream, 0);
516 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
521 } else if (iface->ia_addr_len < 1)
524 /* Try honoring the hint first */
525 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
526 if (assign->assigned) {
527 list_for_each_entry(c, &iface->ia_assignments, head) {
528 if (c->length == 128 || c->length == 0)
531 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
532 list_add_tail(&assign->head, &c->head);
534 if (assign->flags & OAF_BOUND)
535 apply_lease(iface, assign, true);
540 if (c->assigned != 0)
541 current = (c->assigned + (1 << (64 - c->length)));
545 /* Fallback to a variable assignment */
547 list_for_each_entry(c, &iface->ia_assignments, head) {
548 if (c->length == 128 || c->length == 0)
551 current = (current + asize) & (~asize);
552 if (current + asize < c->assigned) {
553 assign->assigned = current;
554 list_add_tail(&assign->head, &c->head);
556 if (assign->flags & OAF_BOUND)
557 apply_lease(iface, assign, true);
562 if (c->assigned != 0)
563 current = (c->assigned + (1 << (64 - c->length)));
569 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
571 /* Seed RNG with checksum of DUID */
573 for (size_t i = 0; i < assign->clid_len; ++i)
574 seed += assign->clid_data[i];
577 /* Try to assign up to 100x */
578 for (size_t i = 0; i < 100; ++i) {
580 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
582 struct dhcpv6_assignment *c;
583 list_for_each_entry(c, &iface->ia_assignments, head) {
587 if (c->assigned > try || c->length != 128) {
588 assign->assigned = try;
589 list_add_tail(&assign->head, &c->head);
591 } else if (c->assigned == try)
599 void dhcpv6_ia_preupdate(struct interface *iface)
601 if (iface->dhcpv6 != RELAYD_SERVER)
604 struct dhcpv6_assignment *c, *border = list_last_entry(
605 &iface->ia_assignments, struct dhcpv6_assignment, head);
607 list_for_each_entry(c, &iface->ia_assignments, head)
608 if (c != border && !iface->managed && (c->flags & OAF_BOUND))
609 apply_lease(iface, c, false);
612 void dhcpv6_ia_postupdate(struct interface *iface, time_t now)
614 if (iface->dhcpv6 != RELAYD_SERVER)
618 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
619 if (iface->ia_addr[i].preferred > (uint32_t)now &&
620 iface->ia_addr[i].prefix < 64 &&
621 iface->ia_addr[i].prefix > minprefix)
622 minprefix = iface->ia_addr[i].prefix;
625 struct dhcpv6_assignment *border = list_last_entry(
626 &iface->ia_assignments, struct dhcpv6_assignment, head);
628 if (minprefix > 32 && minprefix <= 64)
629 border->assigned = 1U << (64 - minprefix);
631 border->assigned = 0;
633 struct list_head reassign = LIST_HEAD_INIT(reassign);
634 struct dhcpv6_assignment *c, *d;
635 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
636 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
640 if (c->length < 128 && c->assigned >= border->assigned && c != border)
641 list_move(&c->head, &reassign);
642 else if (c != border && (c->flags & OAF_BOUND))
643 apply_lease(iface, c, true);
645 if (c->accept_reconf && c->reconf_cnt == 0) {
647 c->reconf_sent = now;
648 send_reconf(iface, c);
650 /* Leave all other assignments of that client alone */
651 struct dhcpv6_assignment *a;
652 list_for_each_entry(a, &iface->ia_assignments, head)
653 if (a != c && a->clid_len == c->clid_len &&
654 !memcmp(a->clid_data, c->clid_data, a->clid_len))
655 c->reconf_cnt = INT_MAX;
659 while (!list_empty(&reassign)) {
660 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
662 if (!assign_pd(iface, c)) {
664 list_add(&c->head, &iface->ia_assignments);
668 dhcpv6_write_statefile();
671 static void reconf_timer(struct uloop_timeout *event)
673 time_t now = odhcpd_time();
674 struct interface *iface;
675 list_for_each_entry(iface, &interfaces, head) {
676 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
679 struct dhcpv6_assignment *a, *n;
680 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
681 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
682 if ((a->length < 128 && a->clid_len > 0) ||
683 (a->length == 128 && a->clid_len == 0))
684 free_dhcpv6_assignment(a);
686 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
687 now > a->reconf_sent + (1 << a->reconf_cnt)) {
689 a->reconf_sent = now;
690 send_reconf(iface, a);
694 uloop_timeout_set(event, 2000);
697 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
698 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
699 struct interface *iface, bool request)
701 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
704 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
705 size_t datalen = sizeof(out);
706 time_t now = odhcpd_time();
709 struct __attribute__((packed)) {
713 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
716 memcpy(buf + datalen, &stat, sizeof(stat));
717 datalen += sizeof(stat);
722 leasetime = a->leasetime;
724 leasetime = iface->dhcpv4_leasetime;
726 uint32_t pref = leasetime;
727 uint32_t valid = leasetime;
729 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
730 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
731 size_t m = elect_addr(addrs, addrlen);
733 for (size_t i = 0; i < addrlen; ++i) {
734 uint32_t prefix_pref = addrs[i].preferred;
735 uint32_t prefix_valid = addrs[i].valid;
737 if (!valid_addr(&addrs[i], now))
740 if (prefix_pref != UINT32_MAX)
743 if (prefix_valid != UINT32_MAX)
746 if (a->length < 128) {
747 struct dhcpv6_ia_prefix p = {
748 .type = htons(DHCPV6_OPT_IA_PREFIX),
749 .len = htons(sizeof(p) - 4),
750 .preferred = htonl(prefix_pref),
751 .valid = htonl(prefix_valid),
752 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
753 .addr = addrs[i].addr
755 p.addr.s6_addr32[1] |= htonl(a->assigned);
757 size_t entrlen = sizeof(p) - 4;
759 if (datalen + entrlen + 4 > buflen ||
760 (a->assigned == 0 && a->managed_size == 0) ||
761 !valid_prefix_length(a, addrs[i].prefix))
764 memcpy(buf + datalen, &p, sizeof(p));
765 datalen += entrlen + 4;
767 struct dhcpv6_ia_addr n = {
768 .type = htons(DHCPV6_OPT_IA_ADDR),
769 .len = htons(sizeof(n) - 4),
770 .addr = addrs[i].addr,
771 .preferred = htonl(prefix_pref),
772 .valid = htonl(prefix_valid)
774 n.addr.s6_addr32[3] = htonl(a->assigned);
775 size_t entrlen = sizeof(n) - 4;
777 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
779 datalen + entrlen + 4 > buflen)
782 memcpy(buf + datalen, &n, sizeof(n));
783 datalen += entrlen + 4;
786 /* Calculate T1 / T2 based on non-deprecated addresses */
787 if (prefix_pref > 0) {
788 if (prefix_pref < pref)
791 if (prefix_valid < valid)
792 valid = prefix_valid;
796 if (!INFINITE_VALID(a->valid_until))
797 /* UINT32_MAX is considered as infinite leasetime */
798 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
800 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
801 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
811 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
812 uint16_t otype, olen;
813 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
814 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
815 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
816 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
817 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
822 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
823 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
825 for (size_t i = 0; i < addrlen; ++i) {
826 if (!valid_addr(&addrs[i], now))
829 struct in6_addr addr = addrs[i].addr;
830 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
831 addr.s6_addr32[1] |= htonl(a->assigned);
833 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
834 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
837 addr.s6_addr32[3] = htonl(a->assigned);
839 if (!memcmp(&n->addr, &addr, sizeof(addr)))
846 if (otype == DHCPV6_OPT_IA_PREFIX) {
847 struct dhcpv6_ia_prefix inv = {
848 .type = htons(DHCPV6_OPT_IA_PREFIX),
849 .len = htons(sizeof(inv) - 4),
856 if (datalen + sizeof(inv) > buflen)
859 memcpy(buf + datalen, &inv, sizeof(inv));
860 datalen += sizeof(inv);
862 struct dhcpv6_ia_addr inv = {
863 .type = htons(DHCPV6_OPT_IA_ADDR),
864 .len = htons(sizeof(inv) - 4),
870 if (datalen + sizeof(inv) > buflen)
873 memcpy(buf + datalen, &inv, sizeof(inv));
874 datalen += sizeof(inv);
881 out.len = htons(datalen - 4);
882 memcpy(buf, &out, sizeof(out));
886 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
887 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
889 const char *type = "UNKNOWN";
890 const char *status = "UNKNOWN";
892 if (msgtype == DHCPV6_MSG_RENEW)
896 case DHCPV6_MSG_SOLICIT:
899 case DHCPV6_MSG_REQUEST:
902 case DHCPV6_MSG_CONFIRM:
905 case DHCPV6_MSG_RENEW:
908 case DHCPV6_MSG_REBIND:
911 case DHCPV6_MSG_RELEASE:
914 case DHCPV6_MSG_DECLINE:
920 case DHCPV6_STATUS_OK:
923 case DHCPV6_STATUS_NOADDRSAVAIL:
924 status = "no addresses available";
926 case DHCPV6_STATUS_NOBINDING:
927 status = "no binding";
929 case DHCPV6_STATUS_NOTONLINK:
930 status = "not on-link";
932 case DHCPV6_STATUS_NOPREFIXAVAIL:
933 status = "no prefix available";
937 char leasebuf[256] = "";
940 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
941 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
943 size_t m = elect_addr(addrs, addrlen);
944 char addrbuf[INET6_ADDRSTRLEN];
946 for (size_t i = 0; i < addrlen; ++i) {
947 if (!valid_addr(&addrs[i], now))
950 struct in6_addr addr = addrs[i].addr;
951 int prefix = a->managed ? addrs[i].prefix : a->length;
953 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
957 addr.s6_addr32[3] = htonl(a->assigned);
960 if (!valid_prefix_length(a, addrs[i].prefix))
963 addr.s6_addr32[1] |= htonl(a->assigned);
966 inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
967 lbsize += snprintf(leasebuf + lbsize, sizeof(leasebuf) - lbsize, "%s/%d ", addrbuf, prefix);
971 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
972 duidbuf, iface->ifname, status, leasebuf);
975 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
976 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
978 time_t now = odhcpd_time();
979 size_t response_len = 0;
980 const struct dhcpv6_client_header *hdr = data;
981 uint8_t *start = (uint8_t*)&hdr[1], *odata;
982 uint16_t otype, olen;
983 /* Find and parse client-id and hostname */
984 bool accept_reconf = false;
985 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
987 size_t hostname_len = 0;
988 bool notonlink = false;
991 dhcpv6_for_each_option(start, end, otype, olen, odata) {
992 if (otype == DHCPV6_OPT_CLIENTID) {
996 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
997 memcpy(mac, &odata[8], sizeof(mac));
998 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
999 memcpy(mac, &odata[4], sizeof(mac));
1002 odhcpd_hexlify(duidbuf, odata, olen);
1003 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1004 uint8_t fqdn_buf[256];
1005 memcpy(fqdn_buf, odata, olen);
1006 fqdn_buf[olen++] = 0;
1008 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1009 hostname_len = strcspn(hostname, ".");
1010 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1011 accept_reconf = true;
1014 if (!clid_data || !clid_len || clid_len > 130)
1017 struct dhcpv6_assignment *first = NULL;
1018 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1019 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1020 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1021 bool ia_addr_present = false;
1022 if (!is_pd && !is_na)
1025 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1026 size_t ia_response_len = 0;
1027 uint8_t reqlen = (is_pd) ? 62 : 128;
1028 uint32_t reqhint = 0;
1030 /* Parse request hint for IA-PD */
1033 uint16_t stype, slen;
1034 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1035 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1038 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1041 reqhint = ntohl(p->addr.s6_addr32[1]);
1042 if (reqlen > 32 && reqlen <= 64)
1043 reqhint &= (1U << (64 - reqlen)) - 1;
1051 uint16_t stype, slen;
1052 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1053 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1056 ia_addr_present = true;
1060 /* Find assignment */
1061 struct dhcpv6_assignment *c, *a = NULL;
1062 list_for_each_entry(c, &iface->ia_assignments, head) {
1063 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1064 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1065 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1066 (c->iaid == ia->iaid || INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1067 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1071 if (a->flags & OAF_BOUND)
1072 apply_lease(iface, a, false);
1074 memcpy(a->clid_data, clid_data, clid_len);
1075 a->clid_len = clid_len;
1084 /* Generic message handling */
1085 uint16_t status = DHCPV6_STATUS_OK;
1086 if (a && a->managed_size < 0)
1089 if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
1090 bool assigned = !!a;
1092 if (!a && !iface->no_dynamic_dhcp) {
1093 /* Create new binding */
1094 a = calloc(1, sizeof(*a) + clid_len);
1096 a->clid_len = clid_len;
1100 a->assigned = reqhint;
1101 /* Set valid time to current time indicating */
1102 /* assignment is not having infinite lifetime */
1103 a->valid_until = now;
1106 memcpy(a->key, first->key, sizeof(a->key));
1108 odhcpd_urandom(a->key, sizeof(a->key));
1109 memcpy(a->clid_data, clid_data, clid_len);
1112 while (!(assigned = assign_pd(iface, a)) &&
1113 !a->managed_size && ++a->length <= 64);
1115 assigned = assign_na(iface, a);
1117 if (a->managed_size && !assigned)
1122 if (!assigned || iface->ia_addr_len == 0)
1123 /* Set error status */
1124 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1125 else if (assigned && !first) {
1126 size_t handshake_len = 4;
1128 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1132 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1133 struct dhcpv6_auth_reconfigure auth = {
1134 htons(DHCPV6_OPT_AUTH),
1135 htons(sizeof(auth) - 4),
1137 {htonl(time(NULL)), htonl(++serial)},
1141 memcpy(auth.key, a->key, sizeof(a->key));
1142 memcpy(buf + handshake_len, &auth, sizeof(auth));
1143 handshake_len += sizeof(auth);
1146 buf += handshake_len;
1147 buflen -= handshake_len;
1148 response_len += handshake_len;
1153 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1155 /* Was only a solicitation: mark binding for removal */
1156 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1157 a->flags &= ~OAF_BOUND;
1159 if (!(a->flags & OAF_STATIC))
1160 a->valid_until = now;
1161 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
1162 if (hostname_len > 0) {
1163 a->hostname = realloc(a->hostname, hostname_len + 1);
1165 memcpy(a->hostname, hostname, hostname_len);
1166 a->hostname[hostname_len] = 0;
1169 a->accept_reconf = accept_reconf;
1170 a->flags |= OAF_BOUND;
1171 apply_lease(iface, a, true);
1172 } else if (!assigned && a && a->managed_size == 0) {
1173 /* Cleanup failed assignment */
1174 free_dhcpv6_assignment(a);
1177 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1178 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1179 hdr->msg_type == DHCPV6_MSG_REBIND ||
1180 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1181 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1182 status = DHCPV6_STATUS_NOBINDING;
1183 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1184 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1185 hdr->msg_type == DHCPV6_MSG_REBIND) {
1186 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1188 a->flags |= OAF_BOUND;
1189 apply_lease(iface, a, true);
1191 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1192 if (!(a->flags & OAF_STATIC))
1193 a->valid_until = now - 1;
1195 if (a->flags & OAF_BOUND) {
1196 apply_lease(iface, a, false);
1197 a->flags &= ~OAF_BOUND;
1199 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1200 a->flags &= ~OAF_BOUND;
1202 if (!(a->flags & OAF_STATIC)) {
1204 a->valid_until = now + 3600; /* Block address for 1h */
1207 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1208 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1209 status = DHCPV6_STATUS_NOTONLINK;
1210 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1214 buf += ia_response_len;
1215 buflen -= ia_response_len;
1216 response_len += ia_response_len;
1217 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1220 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1221 response_len + 6 < buflen) {
1223 buf[1] = DHCPV6_OPT_STATUS;
1227 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1231 dhcpv6_write_statefile();
1234 return response_len;