2 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
19 #include "libubox/md5.h"
20 #include "libubox/usock.h"
34 #include <arpa/inet.h>
35 #include <sys/timerfd.h>
37 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c);
38 static void reconf_timer(struct uloop_timeout *event);
39 static struct uloop_timeout reconf_event = {.cb = reconf_timer};
40 static uint32_t serial = 0;
41 static uint8_t statemd5[16];
43 int dhcpv6_ia_init(void)
45 uloop_timeout_set(&reconf_event, 2000);
49 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
51 if (!enable && iface->ia_assignments.next) {
52 struct dhcpv6_assignment *c;
53 while (!list_empty(&iface->ia_assignments)) {
54 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
55 free_dhcpv6_assignment(c);
59 if (enable && iface->dhcpv6 == RELAYD_SERVER) {
60 if (!iface->ia_assignments.next)
61 INIT_LIST_HEAD(&iface->ia_assignments);
63 if (list_empty(&iface->ia_assignments)) {
64 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
66 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
71 list_add(&border->head, &iface->ia_assignments);
74 /* Parse static entries */
76 list_for_each_entry(lease, &leases, head) {
78 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
79 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
81 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
86 if (lease->dhcpv4_leasetime > 0)
87 a->leasetime = lease->dhcpv4_leasetime;
89 a->clid_len = duid_len;
92 a->assigned = lease->hostid;
94 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
95 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
98 odhcpd_urandom(a->key, sizeof(a->key));
99 memcpy(a->clid_data, lease->duid, lease->duid_len);
100 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
101 /* Static assignment */
102 a->flags |= OAF_STATIC;
106 // Assign to all interfaces
107 struct dhcpv6_assignment *c;
108 list_for_each_entry(c, &iface->ia_assignments, head) {
109 if (c->length != 128 || c->assigned > a->assigned) {
110 list_add_tail(&a->head, &c->head);
112 } else if (c->assigned == a->assigned)
113 /* Already an assignment with that number */
118 if (lease->hostname[0]) {
120 a->hostname = strdup(lease->hostname);
123 free_dhcpv6_assignment(a);
129 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
131 if (c->managed_sock.fd.registered) {
132 ustream_free(&c->managed_sock.stream);
133 close(c->managed_sock.fd.fd);
144 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
147 struct dhcpv6_client_header hdr;
151 uint16_t hardware_type;
156 struct dhcpv6_auth_reconfigure auth;
159 uint8_t clid_data[128];
160 } __attribute__((packed)) reconf_msg = {
161 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
162 .srvid_type = htons(DHCPV6_OPT_SERVERID),
163 .srvid_len = htons(10),
164 .duid_type = htons(3),
165 .hardware_type = htons(1),
166 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
168 .msg_id = DHCPV6_MSG_RENEW,
169 .auth = {htons(DHCPV6_OPT_AUTH),
170 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
171 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
172 .clid_type = htons(DHCPV6_OPT_CLIENTID),
173 .clid_len = htons(assign->clid_len),
177 odhcpd_get_mac(iface, reconf_msg.mac);
178 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
179 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
182 uint8_t secretbytes[64];
183 memset(secretbytes, 0, sizeof(secretbytes));
184 memcpy(secretbytes, assign->key, sizeof(assign->key));
186 for (size_t i = 0; i < sizeof(secretbytes); ++i)
187 secretbytes[i] ^= 0x36;
190 md5_hash(secretbytes, sizeof(secretbytes), &md5);
191 md5_hash(iov.iov_base, iov.iov_len, &md5);
192 md5_end(reconf_msg.auth.key, &md5);
194 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
195 secretbytes[i] ^= 0x36;
196 secretbytes[i] ^= 0x5c;
200 md5_hash(secretbytes, sizeof(secretbytes), &md5);
201 md5_hash(reconf_msg.auth.key, 16, &md5);
202 md5_end(reconf_msg.auth.key, &md5);
204 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
207 void dhcpv6_write_statefile(void)
212 if (config.dhcp_statefile) {
213 time_t now = odhcpd_time(), wall_time = time(NULL);
214 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
218 lockf(fd, F_LOCK, 0);
219 if (ftruncate(fd, 0) < 0) {}
221 FILE *fp = fdopen(fd, "w");
227 struct interface *iface;
228 list_for_each_entry(iface, &interfaces, head) {
229 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
232 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
233 struct dhcpv6_assignment *c;
234 list_for_each_entry(c, &iface->ia_assignments, head) {
235 if (!(c->flags & OAF_BOUND) || c->managed_size < 0)
238 char ipbuf[INET6_ADDRSTRLEN];
241 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
243 // iface DUID iaid hostname lifetime assigned length [addrs...]
244 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %ld %x %u ",
245 iface->ifname, duidbuf, ntohl(c->iaid),
246 (c->hostname ? c->hostname : "-"),
247 (c->valid_until > now ?
248 (c->valid_until - now + wall_time) :
249 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
250 c->assigned, (unsigned)c->length);
252 struct in6_addr addr;
253 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
254 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
257 for (size_t i = 0; i < addrlen; ++i)
258 if (addrs[i].preferred > addrs[m].preferred ||
259 (addrs[i].preferred == addrs[m].preferred &&
260 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
263 for (size_t i = 0; i < addrlen; ++i) {
264 if (addrs[i].prefix > 96 || (!INFINITE_VALID(c->valid_until) && c->valid_until <= now) ||
265 (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
266 addrs[i].prefix == 64))
269 addr = addrs[i].addr;
270 if (c->length == 128)
271 addr.s6_addr32[3] = htonl(c->assigned);
273 addr.s6_addr32[1] |= htonl(c->assigned);
275 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
277 if (c->length == 128 && c->hostname) {
281 if (dn_expand(iface->search, iface->search + iface->search_len,
282 iface->search, b, sizeof(b)) > 0)
283 fprintf(fp, "\t%s.%s", c->hostname, b);
285 fprintf(fp, "\t%s\n", c->hostname);
286 md5_hash(ipbuf, strlen(ipbuf), &md5);
287 md5_hash(c->hostname, strlen(c->hostname), &md5);
290 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%d ", ipbuf,
291 (c->managed_size) ? addrs[i].prefix : c->length);
293 leasebuf[l - 1] = '\n';
294 fwrite(leasebuf, 1, l, fp);
298 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
299 struct dhcpv4_assignment *c;
300 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
301 if (!(c->flags & OAF_BOUND))
304 char ipbuf[INET6_ADDRSTRLEN];
307 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
309 // iface DUID iaid hostname lifetime assigned length [addrs...]
310 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %ld %x 32 ",
311 iface->ifname, duidbuf,
312 (c->hostname ? c->hostname : "-"),
313 (c->valid_until > now ?
314 (c->valid_until - now + wall_time) :
315 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
318 struct in_addr addr = {htonl(c->addr)};
319 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
325 if (dn_expand(iface->search, iface->search + iface->search_len,
326 iface->search, b, sizeof(b)) > 0)
327 fprintf(fp, "\t%s.%s", c->hostname, b);
329 fprintf(fp, "\t%s\n", c->hostname);
330 md5_hash(ipbuf, strlen(ipbuf), &md5);
331 md5_hash(c->hostname, strlen(c->hostname), &md5);
334 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
335 leasebuf[l - 1] = '\n';
336 fwrite(leasebuf, 1, l, fp);
345 md5_end(newmd5, &md5);
347 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
348 memcpy(statemd5, newmd5, sizeof(statemd5));
349 char *argv[2] = {config.dhcp_cb, NULL};
351 execv(argv[0], argv);
358 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
360 if (a->length > 64 || a->managed_size < 0)
363 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
364 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
366 for (size_t i = 0; i < addrlen; ++i) {
367 struct in6_addr prefix = addrs[i].addr;
368 prefix.s6_addr32[1] |= htonl(a->assigned);
369 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
370 iface, &a->peer.sin6_addr, 1024, add);
374 // More data was received from TCP connection
375 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
377 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
378 time_t now = odhcpd_time();
379 bool first = c->managed_size < 0;
383 char *data = ustream_get_read_buf(s, &pending);
384 char *end = memmem(data, pending, "\n\n", 2);
393 if (c->accept_reconf)
397 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
398 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
399 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
401 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
402 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
405 x = strtok_r(NULL, ",", &saveptr2);
406 if (sscanf(x, "%hhu", &n->prefix) < 1)
409 x = strtok_r(NULL, ",", &saveptr2);
410 if (sscanf(x, "%u", &n->preferred) < 1)
413 x = strtok_r(NULL, ",", &saveptr2);
414 if (sscanf(x, "%u", &n->valid) < 1)
417 if (n->preferred > n->valid)
420 if (UINT32_MAX - now < n->preferred)
421 n->preferred = UINT32_MAX;
425 if (UINT32_MAX - now < n->valid)
426 n->valid = UINT32_MAX;
435 ustream_consume(s, end - data);
438 if (first && c->managed_size == 0)
439 free_dhcpv6_assignment(c);
441 c->valid_until = now + 150;
445 /* TCP transmission has ended, either because of success or timeout or other error */
446 static void managed_handle_pd_done(struct ustream *s)
448 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
450 c->valid_until = odhcpd_time() + 15;
453 if (c->accept_reconf)
457 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
459 struct dhcpv6_assignment *c;
461 if (iface->dhcpv6_pd_manager[0]) {
462 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
465 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
467 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
468 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
469 ustream_fd_init(&assign->managed_sock, fd);
470 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
471 iaidbuf, assign->iaid, assign->length);
472 ustream_write_pending(&assign->managed_sock.stream);
473 assign->managed_size = -1;
474 assign->valid_until = odhcpd_time() + 15;
475 list_add(&assign->head, &iface->ia_assignments);
477 /* Wait initial period of up to 250ms for immediate assignment */
478 struct pollfd pfd = { .fd = fd, .events = POLLIN };
480 managed_handle_pd_data(&assign->managed_sock.stream, 0);
482 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
487 } else if (iface->ia_addr_len < 1)
490 /* Try honoring the hint first */
491 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
492 if (assign->assigned) {
493 list_for_each_entry(c, &iface->ia_assignments, head) {
494 if (c->length == 128 || c->length == 0)
497 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
498 list_add_tail(&assign->head, &c->head);
499 apply_lease(iface, assign, true);
503 if (c->assigned != 0)
504 current = (c->assigned + (1 << (64 - c->length)));
508 /* Fallback to a variable assignment */
510 list_for_each_entry(c, &iface->ia_assignments, head) {
511 if (c->length == 128 || c->length == 0)
514 current = (current + asize) & (~asize);
515 if (current + asize < c->assigned) {
516 assign->assigned = current;
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)));
529 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
531 /* Seed RNG with checksum of DUID */
533 for (size_t i = 0; i < assign->clid_len; ++i)
534 seed += assign->clid_data[i];
537 /* Try to assign up to 100x */
538 for (size_t i = 0; i < 100; ++i) {
540 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
542 struct dhcpv6_assignment *c;
543 list_for_each_entry(c, &iface->ia_assignments, head) {
547 if (c->assigned > try || c->length != 128) {
548 assign->assigned = try;
549 list_add_tail(&assign->head, &c->head);
551 } else if (c->assigned == try)
559 void dhcpv6_ia_preupdate(struct interface *iface)
561 if (iface->dhcpv6 != RELAYD_SERVER)
564 struct dhcpv6_assignment *c, *border = list_last_entry(
565 &iface->ia_assignments, struct dhcpv6_assignment, head);
567 list_for_each_entry(c, &iface->ia_assignments, head)
568 if (c != border && !iface->managed)
569 apply_lease(iface, c, false);
572 void dhcpv6_ia_postupdate(struct interface *iface, time_t now)
574 if (iface->dhcpv6 != RELAYD_SERVER)
578 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
579 if (iface->ia_addr[i].preferred > (uint32_t)now &&
580 iface->ia_addr[i].prefix < 64 &&
581 iface->ia_addr[i].prefix > minprefix)
582 minprefix = iface->ia_addr[i].prefix;
585 struct dhcpv6_assignment *border = list_last_entry(
586 &iface->ia_assignments, struct dhcpv6_assignment, head);
588 if (minprefix > 32 && minprefix <= 64)
589 border->assigned = 1U << (64 - minprefix);
591 border->assigned = 0;
593 struct list_head reassign = LIST_HEAD_INIT(reassign);
594 struct dhcpv6_assignment *c, *d;
595 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
596 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
600 if (c->length < 128 && c->assigned >= border->assigned && c != border)
601 list_move(&c->head, &reassign);
602 else if (c != border)
603 apply_lease(iface, c, true);
605 if (c->accept_reconf && c->reconf_cnt == 0) {
607 c->reconf_sent = now;
608 send_reconf(iface, c);
610 /* Leave all other assignments of that client alone */
611 struct dhcpv6_assignment *a;
612 list_for_each_entry(a, &iface->ia_assignments, head)
613 if (a != c && a->clid_len == c->clid_len &&
614 !memcmp(a->clid_data, c->clid_data, a->clid_len))
615 c->reconf_cnt = INT_MAX;
619 while (!list_empty(&reassign)) {
620 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
622 if (!assign_pd(iface, c)) {
624 list_add(&c->head, &iface->ia_assignments);
628 dhcpv6_write_statefile();
631 static void reconf_timer(struct uloop_timeout *event)
633 time_t now = odhcpd_time();
634 struct interface *iface;
635 list_for_each_entry(iface, &interfaces, head) {
636 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
639 struct dhcpv6_assignment *a, *n;
640 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
641 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
642 if ((a->length < 128 && a->clid_len > 0) ||
643 (a->length == 128 && a->clid_len == 0))
644 free_dhcpv6_assignment(a);
646 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
647 now > a->reconf_sent + (1 << a->reconf_cnt)) {
649 a->reconf_sent = now;
650 send_reconf(iface, a);
654 uloop_timeout_set(event, 2000);
657 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
658 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
659 struct interface *iface, bool request)
661 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
664 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
665 size_t datalen = sizeof(out);
666 time_t now = odhcpd_time();
669 struct __attribute__((packed)) {
673 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
676 memcpy(buf + datalen, &stat, sizeof(stat));
677 datalen += sizeof(stat);
681 if (a->leasetime > 0)
682 leasetime = a->leasetime;
684 leasetime = iface->dhcpv4_leasetime;
688 else if (leasetime < 60)
691 uint32_t pref = leasetime;
692 uint32_t valid = leasetime;
694 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
695 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
698 for (size_t i = 0; i < addrlen; ++i)
699 if (addrs[i].preferred > addrs[m].preferred ||
700 (addrs[i].preferred == addrs[m].preferred &&
701 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
704 for (size_t i = 0; i < addrlen; ++i) {
705 uint32_t prefix_pref = addrs[i].preferred;
706 uint32_t prefix_valid = addrs[i].valid;
708 if (addrs[i].prefix > 96 ||
709 addrs[i].preferred <= (uint32_t)now)
712 if (prefix_pref != UINT32_MAX)
715 if (prefix_valid != UINT32_MAX)
718 if (a->length < 128) {
719 struct dhcpv6_ia_prefix p = {
720 .type = htons(DHCPV6_OPT_IA_PREFIX),
721 .len = htons(sizeof(p) - 4),
722 .preferred = htonl(prefix_pref),
723 .valid = htonl(prefix_valid),
724 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
725 .addr = addrs[i].addr
727 p.addr.s6_addr32[1] |= htonl(a->assigned);
729 size_t entrlen = sizeof(p) - 4;
731 if (datalen + entrlen + 4 > buflen ||
732 (a->assigned == 0 && a->managed_size == 0) ||
733 (!a->managed_size && a->length <= addrs[i].prefix))
736 memcpy(buf + datalen, &p, sizeof(p));
737 datalen += entrlen + 4;
739 struct dhcpv6_ia_addr n = {
740 .type = htons(DHCPV6_OPT_IA_ADDR),
741 .len = htons(sizeof(n) - 4),
742 .addr = addrs[i].addr,
743 .preferred = htonl(prefix_pref),
744 .valid = htonl(prefix_valid)
746 n.addr.s6_addr32[3] = htonl(a->assigned);
747 size_t entrlen = sizeof(n) - 4;
749 if (iface->managed < RELAYD_MANAGED_NO_AFLAG && i != m &&
750 addrs[i].prefix <= 64)
753 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
756 memcpy(buf + datalen, &n, sizeof(n));
757 datalen += entrlen + 4;
760 /* Calculate T1 / T2 based on non-deprecated addresses */
761 if (prefix_pref > 0) {
762 if (prefix_pref < pref)
765 if (prefix_valid < valid)
766 valid = prefix_valid;
770 if (!INFINITE_VALID(a->valid_until))
771 /* UINT32_MAX is considered as infinite leasetime */
772 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
774 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
775 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
785 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
786 uint16_t otype, olen;
787 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
788 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
789 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
790 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
791 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
796 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
797 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
799 for (size_t i = 0; i < addrlen; ++i) {
800 if (addrs[i].prefix > 96 ||
801 addrs[i].preferred <= (uint32_t)now)
804 struct in6_addr addr = addrs[i].addr;
805 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
806 addr.s6_addr32[1] |= htonl(a->assigned);
808 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
809 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
812 addr.s6_addr32[3] = htonl(a->assigned);
814 if (!memcmp(&n->addr, &addr, sizeof(addr)))
821 if (otype == DHCPV6_OPT_IA_PREFIX) {
822 struct dhcpv6_ia_prefix inv = {
823 .type = htons(DHCPV6_OPT_IA_PREFIX),
824 .len = htons(sizeof(inv) - 4),
831 if (datalen + sizeof(inv) > buflen)
834 memcpy(buf + datalen, &inv, sizeof(inv));
835 datalen += sizeof(inv);
837 struct dhcpv6_ia_addr inv = {
838 .type = htons(DHCPV6_OPT_IA_ADDR),
839 .len = htons(sizeof(inv) - 4),
845 if (datalen + sizeof(inv) > buflen)
848 memcpy(buf + datalen, &inv, sizeof(inv));
849 datalen += sizeof(inv);
856 out.len = htons(datalen - 4);
857 memcpy(buf, &out, sizeof(out));
861 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
862 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
864 const char *type = "UNKNOWN";
865 const char *status = "UNKNOWN";
867 if (msgtype == DHCPV6_MSG_RENEW)
871 case DHCPV6_MSG_SOLICIT:
874 case DHCPV6_MSG_REQUEST:
877 case DHCPV6_MSG_CONFIRM:
880 case DHCPV6_MSG_RENEW:
883 case DHCPV6_MSG_REBIND:
886 case DHCPV6_MSG_RELEASE:
889 case DHCPV6_MSG_DECLINE:
895 case DHCPV6_STATUS_OK:
898 case DHCPV6_STATUS_NOADDRSAVAIL:
899 status = "no addresses available";
901 case DHCPV6_STATUS_NOBINDING:
902 status = "no binding";
904 case DHCPV6_STATUS_NOTONLINK:
905 status = "not on-link";
907 case DHCPV6_STATUS_NOPREFIXAVAIL:
908 status = "no prefix available";
912 char leasebuf[256] = "";
915 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
916 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
918 char addrbuf[INET6_ADDRSTRLEN];
920 for (size_t i = 0; i < addrlen; ++i) {
921 if (addrs[i].prefix > 96 || addrs[i].preferred <= (uint32_t)now)
924 struct in6_addr addr = addrs[i].addr;
925 int prefix = a->managed ? addrs[i].prefix : a->length;
927 addr.s6_addr32[3] = htonl(a->assigned);
929 addr.s6_addr32[1] |= htonl(a->assigned);
931 inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
932 lbsize += snprintf(leasebuf + lbsize, sizeof(leasebuf) - lbsize, "%s/%d ", addrbuf, prefix);
936 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
937 duidbuf, iface->ifname, status, leasebuf);
940 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
941 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
943 time_t now = odhcpd_time();
944 size_t response_len = 0;
945 const struct dhcpv6_client_header *hdr = data;
946 uint8_t *start = (uint8_t*)&hdr[1], *odata;
947 uint16_t otype, olen;
948 /* Find and parse client-id and hostname */
949 bool accept_reconf = false;
950 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
952 size_t hostname_len = 0;
953 bool notonlink = false;
956 dhcpv6_for_each_option(start, end, otype, olen, odata) {
957 if (otype == DHCPV6_OPT_CLIENTID) {
961 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
962 memcpy(mac, &odata[8], sizeof(mac));
963 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
964 memcpy(mac, &odata[4], sizeof(mac));
967 odhcpd_hexlify(duidbuf, odata, olen);
968 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
969 uint8_t fqdn_buf[256];
970 memcpy(fqdn_buf, odata, olen);
971 fqdn_buf[olen++] = 0;
973 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
974 hostname_len = strcspn(hostname, ".");
975 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
976 accept_reconf = true;
979 if (!clid_data || !clid_len || clid_len > 130)
982 struct dhcpv6_assignment *first = NULL;
983 dhcpv6_for_each_option(start, end, otype, olen, odata) {
984 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
985 bool is_na = (otype == DHCPV6_OPT_IA_NA);
986 bool ia_addr_present = false;
987 if (!is_pd && !is_na)
990 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
991 size_t ia_response_len = 0;
992 uint8_t reqlen = (is_pd) ? 62 : 128;
993 uint32_t reqhint = 0;
995 /* Parse request hint for IA-PD */
998 uint16_t stype, slen;
999 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1000 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1003 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1006 reqhint = ntohl(p->addr.s6_addr32[1]);
1007 if (reqlen > 32 && reqlen <= 64)
1008 reqhint &= (1U << (64 - reqlen)) - 1;
1016 uint16_t stype, slen;
1017 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1018 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1021 ia_addr_present = true;
1025 /* Find assignment */
1026 struct dhcpv6_assignment *c, *a = NULL;
1027 list_for_each_entry(c, &iface->ia_assignments, head) {
1028 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1029 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1030 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1031 (c->iaid == ia->iaid || INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1032 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1036 apply_lease(iface, a, false);
1037 memcpy(a->clid_data, clid_data, clid_len);
1038 a->clid_len = clid_len;
1047 /* Generic message handling */
1048 uint16_t status = DHCPV6_STATUS_OK;
1049 if (a && a->managed_size < 0)
1052 if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
1053 bool assigned = !!a;
1055 if (!a && !iface->no_dynamic_dhcp) {
1056 /* Create new binding */
1057 a = calloc(1, sizeof(*a) + clid_len);
1059 a->clid_len = clid_len;
1063 a->assigned = reqhint;
1064 /* Set valid time to current time indicating */
1065 /* assignment is not having infinite lifetime */
1066 a->valid_until = now;
1069 memcpy(a->key, first->key, sizeof(a->key));
1071 odhcpd_urandom(a->key, sizeof(a->key));
1072 memcpy(a->clid_data, clid_data, clid_len);
1075 while (!(assigned = assign_pd(iface, a)) &&
1076 !a->managed_size && ++a->length <= 64);
1078 assigned = assign_na(iface, a);
1080 if (a->managed_size && !assigned)
1085 if (!assigned || iface->ia_addr_len == 0)
1086 /* Set error status */
1087 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1088 else if (assigned && !first) {
1089 size_t handshake_len = 4;
1091 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1095 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1096 struct dhcpv6_auth_reconfigure auth = {
1097 htons(DHCPV6_OPT_AUTH),
1098 htons(sizeof(auth) - 4),
1100 {htonl(time(NULL)), htonl(++serial)},
1104 memcpy(auth.key, a->key, sizeof(a->key));
1105 memcpy(buf + handshake_len, &auth, sizeof(auth));
1106 handshake_len += sizeof(auth);
1109 buf += handshake_len;
1110 buflen -= handshake_len;
1111 response_len += handshake_len;
1116 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1118 /* Was only a solicitation: mark binding for removal */
1119 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1120 a->flags &= ~OAF_BOUND;
1122 if (!(a->flags & OAF_STATIC))
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 a->flags |= OAF_BOUND;
1134 apply_lease(iface, a, true);
1135 } else if (!assigned && a && a->managed_size == 0)
1136 /* Cleanup failed assignment */
1137 free_dhcpv6_assignment(a);
1139 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1140 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1141 hdr->msg_type == DHCPV6_MSG_REBIND ||
1142 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1143 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1144 status = DHCPV6_STATUS_NOBINDING;
1145 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1146 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1147 hdr->msg_type == DHCPV6_MSG_REBIND) {
1148 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1150 a->flags |= OAF_BOUND;
1151 apply_lease(iface, a, true);
1153 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1154 if (!(a->flags & OAF_STATIC))
1155 a->valid_until = now - 1;
1157 a->flags &= ~OAF_BOUND;
1158 apply_lease(iface, a, false);
1159 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1160 a->flags &= ~OAF_BOUND;
1162 if (!(a->flags & OAF_STATIC)) {
1164 a->valid_until = now + 3600; /* Block address for 1h */
1167 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1168 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1169 status = DHCPV6_STATUS_NOTONLINK;
1170 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1174 buf += ia_response_len;
1175 buflen -= ia_response_len;
1176 response_len += ia_response_len;
1177 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1180 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1181 response_len + 6 < buflen) {
1183 buf[1] = DHCPV6_OPT_STATUS;
1187 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1191 dhcpv6_write_statefile();
1194 return response_len;