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.
32 #include <arpa/inet.h>
33 #include <sys/timerfd.h>
35 #include <libubox/md5.h>
36 #include <libubox/usock.h>
38 #define ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) \
39 ((iface)->dhcpv6_assignall || (i) == (m) || \
40 (addrs)[(i)].prefix > 64)
42 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info);
43 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c);
44 static void set_border_assignment_size(struct interface *iface, struct dhcpv6_assignment *b);
45 static void handle_addrlist_change(struct netevent_handler_info *info);
46 static void start_reconf(struct dhcpv6_assignment *a);
47 static void stop_reconf(struct dhcpv6_assignment *a);
48 static void valid_until_cb(struct uloop_timeout *event);
50 static struct netevent_handler dhcpv6_netevent_handler = { .cb = dhcpv6_netevent_cb, };
51 static struct uloop_timeout valid_until_timeout = {.cb = valid_until_cb};
52 static uint32_t serial = 0;
53 static uint8_t statemd5[16];
55 int dhcpv6_ia_init(void)
57 uloop_timeout_set(&valid_until_timeout, 1000);
59 netlink_add_netevent_handler(&dhcpv6_netevent_handler);
64 int dhcpv6_setup_ia_interface(struct interface *iface, bool enable)
66 if (!enable && iface->ia_assignments.next) {
67 struct dhcpv6_assignment *c;
69 while (!list_empty(&iface->ia_assignments)) {
70 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
71 free_dhcpv6_assignment(c);
75 if (enable && iface->dhcpv6 == MODE_SERVER) {
76 struct dhcpv6_assignment *border;
79 if (!iface->ia_assignments.next)
80 INIT_LIST_HEAD(&iface->ia_assignments);
82 if (list_empty(&iface->ia_assignments)) {
83 border = calloc(1, sizeof(*border));
86 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
91 list_add(&border->head, &iface->ia_assignments);
93 border = list_last_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
95 set_border_assignment_size(iface, border);
97 /* Parse static entries */
98 list_for_each_entry(lease, &leases, head) {
100 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
101 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
103 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
108 a->leasetime = lease->dhcpv4_leasetime;
110 a->clid_len = duid_len;
113 a->assigned = lease->hostid;
115 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
116 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
119 odhcpd_urandom(a->key, sizeof(a->key));
120 memcpy(a->clid_data, lease->duid, lease->duid_len);
121 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
122 /* Static assignment */
123 a->flags |= OAF_STATIC;
127 /* Assign to all interfaces */
128 struct dhcpv6_assignment *c;
129 list_for_each_entry(c, &iface->ia_assignments, head) {
130 if (c->length != 128 || c->assigned > a->assigned) {
131 list_add_tail(&a->head, &c->head);
133 } else if (c->assigned == a->assigned)
134 /* Already an assignment with that number */
140 if (lease->hostname[0]) {
142 a->hostname = strdup(lease->hostname);
145 free_dhcpv6_assignment(a);
152 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info)
154 struct interface *iface = info->iface;
156 if (!iface || iface->dhcpv6 != MODE_SERVER)
160 case NETEV_ADDR6LIST_CHANGE:
161 handle_addrlist_change(info);
169 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
171 if (c->managed_sock.fd.registered) {
172 ustream_free(&c->managed_sock.stream);
173 close(c->managed_sock.fd.fd);
187 static inline bool valid_prefix_length(const struct dhcpv6_assignment *a, const uint8_t prefix_length)
189 return (a->managed_size || a->length > prefix_length);
192 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
194 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
197 static size_t get_preferred_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
201 for (i = 0, m = 0; i < addrlen; ++i) {
202 if (addrs[i].preferred > addrs[m].preferred ||
203 (addrs[i].preferred == addrs[m].preferred &&
204 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
211 static int send_reconf(struct dhcpv6_assignment *assign)
214 struct dhcpv6_client_header hdr;
218 uint16_t hardware_type;
223 struct dhcpv6_auth_reconfigure auth;
226 uint8_t clid_data[128];
227 } __attribute__((packed)) reconf_msg = {
228 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
229 .srvid_type = htons(DHCPV6_OPT_SERVERID),
230 .srvid_len = htons(10),
231 .duid_type = htons(3),
232 .hardware_type = htons(1),
233 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
235 .msg_id = DHCPV6_MSG_RENEW,
236 .auth = {htons(DHCPV6_OPT_AUTH),
237 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
238 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
239 .clid_type = htons(DHCPV6_OPT_CLIENTID),
240 .clid_len = htons(assign->clid_len),
243 struct interface *iface = assign->iface;
245 odhcpd_get_mac(iface, reconf_msg.mac);
246 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
247 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
250 uint8_t secretbytes[64];
251 memset(secretbytes, 0, sizeof(secretbytes));
252 memcpy(secretbytes, assign->key, sizeof(assign->key));
254 for (size_t i = 0; i < sizeof(secretbytes); ++i)
255 secretbytes[i] ^= 0x36;
258 md5_hash(secretbytes, sizeof(secretbytes), &md5);
259 md5_hash(iov.iov_base, iov.iov_len, &md5);
260 md5_end(reconf_msg.auth.key, &md5);
262 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
263 secretbytes[i] ^= 0x36;
264 secretbytes[i] ^= 0x5c;
268 md5_hash(secretbytes, sizeof(secretbytes), &md5);
269 md5_hash(reconf_msg.auth.key, 16, &md5);
270 md5_end(reconf_msg.auth.key, &md5);
272 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
275 void dhcpv6_enum_ia_addrs(struct interface *iface, struct dhcpv6_assignment *c,
276 time_t now, dhcpv6_binding_cb_handler_t func, void *arg)
278 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->addr6;
279 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->addr6_len;
280 size_t m = get_preferred_addr(addrs, addrlen);
282 for (size_t i = 0; i < addrlen; ++i) {
283 struct in6_addr addr;
284 uint32_t pref, valid;
285 int prefix = c->managed ? addrs[i].prefix : c->length;
287 if (!valid_addr(&addrs[i], now))
290 addr = addrs[i].addr.in6;
291 pref = addrs[i].preferred;
292 valid = addrs[i].valid;
294 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
297 addr.s6_addr32[3] = htonl(c->assigned);
299 if (!valid_prefix_length(c, addrs[i].prefix))
302 addr.s6_addr32[1] |= htonl(c->assigned);
303 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
306 if (pref != UINT32_MAX)
309 if (valid != UINT32_MAX)
312 func(&addr, prefix, pref, valid, arg);
319 struct dhcpv6_assignment *c;
320 struct interface *iface;
326 void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
327 _unused uint32_t valid, void *arg)
329 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
330 char ipbuf[INET6_ADDRSTRLEN];
332 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
334 if (ctxt->c->length == 128 && ctxt->c->hostname &&
335 !(ctxt->c->flags & OAF_BROKEN_HOSTNAME)) {
336 fputs(ipbuf, ctxt->fp);
339 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
340 ctxt->iface->search, b, sizeof(b)) > 0)
341 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
343 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
344 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
345 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
348 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
349 "%s/%d ", ipbuf, prefix);
352 void dhcpv6_write_statefile(void)
354 struct write_ctxt ctxt;
356 md5_begin(&ctxt.md5);
358 if (config.dhcp_statefile) {
359 time_t now = odhcpd_time(), wall_time = time(NULL);
360 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
366 ret = lockf(fd, F_LOCK, 0);
371 if (ftruncate(fd, 0) < 0) {}
373 ctxt.fp = fdopen(fd, "w");
380 ctxt.buf_len = sizeof(leasebuf);
382 list_for_each_entry(ctxt.iface, &interfaces, head) {
383 if (ctxt.iface->dhcpv6 != MODE_SERVER &&
384 ctxt.iface->dhcpv4 != MODE_SERVER)
387 if (ctxt.iface->dhcpv6 == MODE_SERVER &&
388 ctxt.iface->ia_assignments.next) {
389 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
390 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
395 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
397 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
398 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s%s %ld %x %u ",
399 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
400 (ctxt.c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
401 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
402 (ctxt.c->valid_until > now ?
403 (ctxt.c->valid_until - now + wall_time) :
404 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
405 ctxt.c->assigned, (unsigned)ctxt.c->length);
407 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
408 dhcpv6_enum_ia_addrs(ctxt.iface, ctxt.c, now,
409 dhcpv6_write_ia_addr, &ctxt);
411 ctxt.buf[ctxt.buf_idx - 1] = '\n';
412 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
416 if (ctxt.iface->dhcpv4 == MODE_SERVER &&
417 ctxt.iface->dhcpv4_assignments.next) {
418 struct dhcpv4_assignment *c;
419 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
420 if (!(c->flags & OAF_BOUND))
423 char ipbuf[INET6_ADDRSTRLEN];
425 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
427 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
428 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s%s %ld %x 32 ",
429 ctxt.iface->ifname, duidbuf,
430 (c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
431 (c->hostname ? c->hostname : "-"),
432 (c->valid_until > now ?
433 (c->valid_until - now + wall_time) :
434 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
437 struct in_addr addr = {.s_addr = c->addr};
438 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
440 if (c->hostname && !(c->flags & OAF_BROKEN_HOSTNAME)) {
441 fputs(ipbuf, ctxt.fp);
444 if (dn_expand(ctxt.iface->search,
445 ctxt.iface->search + ctxt.iface->search_len,
446 ctxt.iface->search, b, sizeof(b)) > 0)
447 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
449 fprintf(ctxt.fp, "\t%s\n", c->hostname);
450 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
451 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
454 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
455 ctxt.buf_len - ctxt.buf_idx,
457 ctxt.buf[ctxt.buf_idx - 1] = '\n';
458 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
467 md5_end(newmd5, &ctxt.md5);
469 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
470 memcpy(statemd5, newmd5, sizeof(statemd5));
471 char *argv[2] = {config.dhcp_cb, NULL};
473 execv(argv[0], argv);
479 static void __apply_lease(struct interface *iface, struct dhcpv6_assignment *a,
480 struct odhcpd_ipaddr *addrs, ssize_t addr_len, bool add)
485 for (ssize_t i = 0; i < addr_len; ++i) {
486 struct in6_addr prefix = addrs[i].addr.in6;
487 prefix.s6_addr32[1] |= htonl(a->assigned);
488 prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
489 netlink_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
490 iface->ifindex, &a->peer.sin6_addr, 1024, add);
494 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
496 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
497 ssize_t addrlen = (a->managed) ? a->managed_size : (ssize_t)iface->addr6_len;
499 __apply_lease(iface, a, addrs, addrlen, add);
502 /* Set border assignment size based on the IPv6 address prefixes */
503 static void set_border_assignment_size(struct interface *iface, struct dhcpv6_assignment *b)
505 time_t now = odhcpd_time();
508 for (size_t i = 0; i < iface->addr6_len; ++i) {
509 if (iface->addr6[i].preferred > (uint32_t)now &&
510 iface->addr6[i].prefix < 64 &&
511 iface->addr6[i].prefix > minprefix)
512 minprefix = iface->addr6[i].prefix;
515 if (minprefix > 32 && minprefix <= 64)
516 b->assigned = 1U << (64 - minprefix);
521 /* More data was received from TCP connection */
522 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
524 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
525 time_t now = odhcpd_time();
526 bool first = c->managed_size < 0;
530 char *data = ustream_get_read_buf(s, &pending);
531 char *end = memmem(data, pending, "\n\n", 2);
540 if (c->accept_reconf)
544 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
545 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
546 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
548 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
549 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
552 x = strtok_r(NULL, ",", &saveptr2);
553 if (sscanf(x, "%hhu", &n->prefix) < 1)
556 x = strtok_r(NULL, ",", &saveptr2);
557 if (sscanf(x, "%u", &n->preferred) < 1)
560 x = strtok_r(NULL, ",", &saveptr2);
561 if (sscanf(x, "%u", &n->valid) < 1)
564 if (n->preferred > n->valid)
567 if (UINT32_MAX - now < n->preferred)
568 n->preferred = UINT32_MAX;
572 if (UINT32_MAX - now < n->valid)
573 n->valid = UINT32_MAX;
582 ustream_consume(s, end - data);
585 if (first && c->managed_size == 0)
586 free_dhcpv6_assignment(c);
587 else if (first && !(c->flags & OAF_STATIC))
588 c->valid_until = now + 150;
592 /* TCP transmission has ended, either because of success or timeout or other error */
593 static void managed_handle_pd_done(struct ustream *s)
595 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
597 if (!(c->flags & OAF_STATIC))
598 c->valid_until = odhcpd_time() + 15;
602 if (c->accept_reconf)
606 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
608 struct dhcpv6_assignment *c;
610 if (iface->dhcpv6_pd_manager[0]) {
611 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
613 struct pollfd pfd = { .fd = fd, .events = POLLIN };
616 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
618 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
619 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
620 ustream_fd_init(&assign->managed_sock, fd);
621 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
622 iaidbuf, assign->iaid, assign->length);
623 ustream_write_pending(&assign->managed_sock.stream);
624 assign->managed_size = -1;
626 if (!(assign->flags & OAF_STATIC))
627 assign->valid_until = odhcpd_time() + 15;
629 list_add(&assign->head, &iface->ia_assignments);
631 /* Wait initial period of up to 250ms for immediate assignment */
632 if (poll(&pfd, 1, 250) < 0) {
633 syslog(LOG_ERR, "poll(): %m");
637 managed_handle_pd_data(&assign->managed_sock.stream, 0);
639 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
644 } else if (iface->addr6_len < 1)
647 /* Try honoring the hint first */
648 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
649 if (assign->assigned) {
650 list_for_each_entry(c, &iface->ia_assignments, head) {
651 if (c->length == 128 || c->length == 0)
654 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
655 list_add_tail(&assign->head, &c->head);
657 if (assign->flags & OAF_BOUND)
658 apply_lease(iface, assign, true);
663 if (c->assigned != 0)
664 current = (c->assigned + (1 << (64 - c->length)));
668 /* Fallback to a variable assignment */
670 list_for_each_entry(c, &iface->ia_assignments, head) {
671 if (c->length == 128 || c->length == 0)
674 current = (current + asize) & (~asize);
675 if (current + asize < c->assigned) {
676 assign->assigned = current;
677 list_add_tail(&assign->head, &c->head);
679 if (assign->flags & OAF_BOUND)
680 apply_lease(iface, assign, true);
685 if (c->assigned != 0)
686 current = (c->assigned + (1 << (64 - c->length)));
692 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
694 /* Seed RNG with checksum of DUID */
696 for (size_t i = 0; i < assign->clid_len; ++i)
697 seed += assign->clid_data[i];
700 /* Try to assign up to 100x */
701 for (size_t i = 0; i < 100; ++i) {
703 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
705 struct dhcpv6_assignment *c;
706 list_for_each_entry(c, &iface->ia_assignments, head) {
710 if (c->assigned > try || c->length != 128) {
711 assign->assigned = try;
712 list_add_tail(&assign->head, &c->head);
714 } else if (c->assigned == try)
722 static void handle_addrlist_change(struct netevent_handler_info *info)
724 struct interface *iface = info->iface;
725 struct dhcpv6_assignment *c, *d, *border = list_last_entry(
726 &iface->ia_assignments, struct dhcpv6_assignment, head);
727 struct list_head reassign = LIST_HEAD_INIT(reassign);
728 time_t now = odhcpd_time();
730 list_for_each_entry(c, &iface->ia_assignments, head) {
731 if (c != border && iface->ra_managed == RA_MANAGED_NO_MFLAG
732 && (c->flags & OAF_BOUND))
733 __apply_lease(iface, c, info->addrs_old.addrs,
734 info->addrs_old.len, false);
737 set_border_assignment_size(iface, border);
739 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
740 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
744 if (c->length < 128 && c->assigned >= border->assigned && c != border)
745 list_move(&c->head, &reassign);
746 else if (c != border && (c->flags & OAF_BOUND))
747 apply_lease(iface, c, true);
749 if (c->accept_reconf && c->reconf_cnt == 0) {
750 struct dhcpv6_assignment *a;
754 /* Leave all other assignments of that client alone */
755 list_for_each_entry(a, &iface->ia_assignments, head)
756 if (a != c && a->clid_len == c->clid_len &&
757 !memcmp(a->clid_data, c->clid_data, a->clid_len))
758 a->reconf_cnt = INT_MAX;
762 while (!list_empty(&reassign)) {
763 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
765 if (!assign_pd(iface, c)) {
767 list_add(&c->head, &iface->ia_assignments);
771 dhcpv6_write_statefile();
774 static void reconf_timeout_cb(struct uloop_timeout *event)
776 struct dhcpv6_assignment *a = container_of(event, struct dhcpv6_assignment, reconf_timer);
778 if (a->reconf_cnt > 0 && a->reconf_cnt < DHCPV6_REC_MAX_RC) {
780 uloop_timeout_set(&a->reconf_timer,
781 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
787 static void start_reconf(struct dhcpv6_assignment *a)
789 uloop_timeout_set(&a->reconf_timer,
790 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
791 a->reconf_timer.cb = reconf_timeout_cb;
797 static void stop_reconf(struct dhcpv6_assignment *a)
799 uloop_timeout_cancel(&a->reconf_timer);
801 a->reconf_timer.cb = NULL;
804 static void valid_until_cb(struct uloop_timeout *event)
806 time_t now = odhcpd_time();
807 struct interface *iface;
808 list_for_each_entry(iface, &interfaces, head) {
809 if (iface->dhcpv6 != MODE_SERVER || iface->ia_assignments.next == NULL)
812 struct dhcpv6_assignment *a, *n;
813 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
814 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
815 if ((a->length < 128 && a->clid_len > 0) ||
816 (a->length == 128 && a->clid_len == 0))
817 free_dhcpv6_assignment(a);
822 uloop_timeout_set(event, 1000);
825 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
826 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
827 struct interface *iface, bool request)
829 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
832 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
833 size_t datalen = sizeof(out);
834 time_t now = odhcpd_time();
837 struct __attribute__((packed)) {
841 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
844 memcpy(buf + datalen, &stat, sizeof(stat));
845 datalen += sizeof(stat);
850 leasetime = a->leasetime;
852 leasetime = iface->dhcpv4_leasetime;
854 uint32_t pref = leasetime;
855 uint32_t valid = leasetime;
857 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
858 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
859 size_t m = get_preferred_addr(addrs, addrlen);
861 for (size_t i = 0; i < addrlen; ++i) {
862 uint32_t prefix_pref = addrs[i].preferred;
863 uint32_t prefix_valid = addrs[i].valid;
865 if (!valid_addr(&addrs[i], now))
868 if (prefix_pref != UINT32_MAX)
871 if (prefix_valid != UINT32_MAX)
874 if (a->length < 128) {
875 struct dhcpv6_ia_prefix p = {
876 .type = htons(DHCPV6_OPT_IA_PREFIX),
877 .len = htons(sizeof(p) - 4),
878 .preferred = htonl(prefix_pref),
879 .valid = htonl(prefix_valid),
880 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
881 .addr = addrs[i].addr.in6,
883 p.addr.s6_addr32[1] |= htonl(a->assigned);
884 p.addr.s6_addr32[2] = p.addr.s6_addr32[3] = 0;
886 size_t entrlen = sizeof(p) - 4;
888 if (datalen + entrlen + 4 > buflen ||
889 (a->assigned == 0 && a->managed_size == 0) ||
890 !valid_prefix_length(a, addrs[i].prefix))
893 memcpy(buf + datalen, &p, sizeof(p));
894 datalen += entrlen + 4;
896 struct dhcpv6_ia_addr n = {
897 .type = htons(DHCPV6_OPT_IA_ADDR),
898 .len = htons(sizeof(n) - 4),
899 .addr = addrs[i].addr.in6,
900 .preferred = htonl(prefix_pref),
901 .valid = htonl(prefix_valid)
903 n.addr.s6_addr32[3] = htonl(a->assigned);
904 size_t entrlen = sizeof(n) - 4;
906 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
908 datalen + entrlen + 4 > buflen)
911 memcpy(buf + datalen, &n, sizeof(n));
912 datalen += entrlen + 4;
915 /* Calculate T1 / T2 based on non-deprecated addresses */
916 if (prefix_pref > 0) {
917 if (prefix_pref < pref)
920 if (prefix_valid < valid)
921 valid = prefix_valid;
925 if (!INFINITE_VALID(a->valid_until))
926 /* UINT32_MAX is considered as infinite leasetime */
927 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
929 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
930 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
940 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
941 uint16_t otype, olen;
943 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
944 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
945 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
948 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
949 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
953 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
954 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
956 for (size_t i = 0; i < addrlen; ++i) {
957 if (!valid_addr(&addrs[i], now))
960 struct in6_addr addr = addrs[i].addr.in6;
961 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
962 addr.s6_addr32[1] |= htonl(a->assigned);
963 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
965 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
966 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
969 addr.s6_addr32[3] = htonl(a->assigned);
971 if (!memcmp(&n->addr, &addr, sizeof(addr)))
978 if (otype == DHCPV6_OPT_IA_PREFIX) {
979 struct dhcpv6_ia_prefix inv = {
980 .type = htons(DHCPV6_OPT_IA_PREFIX),
981 .len = htons(sizeof(inv) - 4),
988 if (datalen + sizeof(inv) > buflen)
991 memcpy(buf + datalen, &inv, sizeof(inv));
992 datalen += sizeof(inv);
994 struct dhcpv6_ia_addr inv = {
995 .type = htons(DHCPV6_OPT_IA_ADDR),
996 .len = htons(sizeof(inv) - 4),
1002 if (datalen + sizeof(inv) > buflen)
1005 memcpy(buf + datalen, &inv, sizeof(inv));
1006 datalen += sizeof(inv);
1013 out.len = htons(datalen - 4);
1014 memcpy(buf, &out, sizeof(out));
1024 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
1025 _unused uint32_t valid, void *arg)
1027 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1028 char addrbuf[INET6_ADDRSTRLEN];
1030 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1031 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1032 "%s/%d ", addrbuf, prefix);
1035 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1036 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
1038 const char *type = "UNKNOWN";
1039 const char *status = "UNKNOWN";
1042 case DHCPV6_MSG_SOLICIT:
1045 case DHCPV6_MSG_REQUEST:
1048 case DHCPV6_MSG_CONFIRM:
1051 case DHCPV6_MSG_RENEW:
1054 case DHCPV6_MSG_REBIND:
1057 case DHCPV6_MSG_RELEASE:
1060 case DHCPV6_MSG_DECLINE:
1066 case DHCPV6_STATUS_OK:
1069 case DHCPV6_STATUS_NOADDRSAVAIL:
1070 status = "no addresses available";
1072 case DHCPV6_STATUS_NOBINDING:
1073 status = "no binding";
1075 case DHCPV6_STATUS_NOTONLINK:
1076 status = "not on-link";
1078 case DHCPV6_STATUS_NOPREFIXAVAIL:
1079 status = "no prefix available";
1083 char leasebuf[256] = "";
1086 struct log_ctxt ctxt = {.buf = leasebuf,
1087 .buf_len = sizeof(leasebuf),
1090 dhcpv6_enum_ia_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1093 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1094 duidbuf, iface->ifname, status, leasebuf);
1097 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
1098 struct interface *iface)
1100 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
1101 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
1102 time_t now = odhcpd_time();
1103 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
1104 uint16_t otype, olen;
1105 bool onlink = false;
1107 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
1108 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
1109 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
1111 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
1112 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
1115 for (size_t i = 0; i < addrlen; ++i) {
1116 struct in6_addr addr = addrs[i].addr.in6;
1118 if (!valid_addr(&addrs[i], now))
1121 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
1122 addr.s6_addr32[1] |= htonl(a->assigned);
1123 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
1125 if (memcmp(&p->addr, &addr, sizeof(addr)) ||
1126 p->prefix != ((a->managed) ? addrs[i].prefix : a->length))
1129 addr.s6_addr32[3] = htonl(a->assigned);
1131 if (memcmp(&n->addr, &addr, sizeof(addr)))
1144 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
1145 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1147 time_t now = odhcpd_time();
1148 size_t response_len = 0;
1149 const struct dhcpv6_client_header *hdr = data;
1150 uint8_t *start = (uint8_t*)&hdr[1], *odata;
1151 uint16_t otype, olen;
1152 /* Find and parse client-id and hostname */
1153 bool accept_reconf = false;
1154 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1156 size_t hostname_len = 0;
1157 bool notonlink = false;
1160 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1161 if (otype == DHCPV6_OPT_CLIENTID) {
1165 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1166 memcpy(mac, &odata[8], sizeof(mac));
1167 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1168 memcpy(mac, &odata[4], sizeof(mac));
1171 odhcpd_hexlify(duidbuf, odata, olen);
1172 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1173 uint8_t fqdn_buf[256];
1174 memcpy(fqdn_buf, odata, olen);
1175 fqdn_buf[olen++] = 0;
1177 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1178 hostname_len = strcspn(hostname, ".");
1179 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1180 accept_reconf = true;
1183 if (!clid_data || !clid_len || clid_len > 130)
1186 struct dhcpv6_assignment *first = NULL;
1187 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1188 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1189 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1190 bool ia_addr_present = false;
1191 if (!is_pd && !is_na)
1194 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1195 size_t ia_response_len = 0;
1196 uint8_t reqlen = (is_pd) ? 62 : 128;
1197 uint32_t reqhint = 0;
1199 /* Parse request hint for IA-PD */
1202 uint16_t stype, slen;
1203 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1204 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1207 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1210 reqhint = ntohl(p->addr.s6_addr32[1]);
1211 if (reqlen > 32 && reqlen <= 64)
1212 reqhint &= (1U << (64 - reqlen)) - 1;
1220 uint16_t stype, slen;
1221 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1222 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1225 ia_addr_present = true;
1229 /* Find assignment */
1230 struct dhcpv6_assignment *c, *a = NULL;
1231 list_for_each_entry(c, &iface->ia_assignments, head) {
1232 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1233 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1234 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1235 (!(c->flags & (OAF_BOUND|OAF_TENTATIVE)) || c->iaid == ia->iaid) &&
1236 (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1237 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1241 if (a->flags & OAF_BOUND)
1242 apply_lease(iface, a, false);
1244 memcpy(a->clid_data, clid_data, clid_len);
1245 a->clid_len = clid_len;
1253 /* Generic message handling */
1254 uint16_t status = DHCPV6_STATUS_OK;
1255 if (a && a->managed_size < 0)
1258 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1259 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1260 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1261 bool assigned = !!a;
1263 if (!a && !iface->no_dynamic_dhcp) {
1264 /* Create new binding */
1265 a = calloc(1, sizeof(*a) + clid_len);
1267 a->clid_len = clid_len;
1271 a->assigned = reqhint;
1272 /* Set valid time to current time indicating */
1273 /* assignment is not having infinite lifetime */
1274 a->valid_until = now;
1278 memcpy(a->key, first->key, sizeof(a->key));
1280 odhcpd_urandom(a->key, sizeof(a->key));
1281 memcpy(a->clid_data, clid_data, clid_len);
1284 while (!(assigned = assign_pd(iface, a)) &&
1285 !a->managed_size && ++a->length <= 64);
1287 assigned = assign_na(iface, a);
1289 if (a->managed_size && !assigned)
1294 if (!assigned || iface->addr6_len == 0)
1295 /* Set error status */
1296 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1297 else if (hdr->msg_type == DHCPV6_MSG_REQUEST && !dhcpv6_ia_on_link(ia, a, iface)) {
1298 /* Send NOTONLINK staus for the IA */
1299 status = DHCPV6_STATUS_NOTONLINK;
1301 } else if (accept_reconf && assigned && !first &&
1302 hdr->msg_type != DHCPV6_MSG_REBIND) {
1303 size_t handshake_len = 4;
1305 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1309 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1310 struct dhcpv6_auth_reconfigure auth = {
1311 htons(DHCPV6_OPT_AUTH),
1312 htons(sizeof(auth) - 4),
1314 {htonl(time(NULL)), htonl(++serial)},
1318 memcpy(auth.key, a->key, sizeof(a->key));
1319 memcpy(buf + handshake_len, &auth, sizeof(auth));
1320 handshake_len += sizeof(auth);
1323 buf += handshake_len;
1324 buflen -= handshake_len;
1325 response_len += handshake_len;
1330 ia_response_len = append_reply(buf, buflen, status, ia, a, iface,
1331 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1333 /* Was only a solicitation: mark binding for removal */
1334 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1335 a->flags &= ~OAF_BOUND;
1336 a->flags |= OAF_TENTATIVE;
1338 if (!(a->flags & OAF_STATIC))
1339 /* Keep tentative assignment around for 60 seconds */
1340 a->valid_until = now + 60;
1341 } else if (assigned &&
1342 (hdr->msg_type == DHCPV6_MSG_REQUEST ||
1343 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1344 if (hostname_len > 0) {
1345 a->hostname = realloc(a->hostname, hostname_len + 1);
1347 memcpy(a->hostname, hostname, hostname_len);
1348 a->hostname[hostname_len] = 0;
1350 if (odhcpd_valid_hostname(a->hostname))
1351 a->flags &= ~OAF_BROKEN_HOSTNAME;
1353 a->flags |= OAF_BROKEN_HOSTNAME;
1356 a->accept_reconf = accept_reconf;
1357 a->flags &= ~OAF_TENTATIVE;
1358 a->flags |= OAF_BOUND;
1359 apply_lease(iface, a, true);
1360 } else if (!assigned && a && a->managed_size == 0) {
1361 /* Cleanup failed assignment */
1362 free_dhcpv6_assignment(a);
1365 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1366 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1367 hdr->msg_type == DHCPV6_MSG_REBIND ||
1368 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1369 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1370 status = DHCPV6_STATUS_NOBINDING;
1371 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1372 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1373 hdr->msg_type == DHCPV6_MSG_REBIND) {
1374 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1376 a->flags |= OAF_BOUND;
1377 apply_lease(iface, a, true);
1379 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1380 if (!(a->flags & OAF_STATIC))
1381 a->valid_until = now - 1;
1383 if (a->flags & OAF_BOUND) {
1384 apply_lease(iface, a, false);
1385 a->flags &= ~OAF_BOUND;
1387 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1388 a->flags &= ~OAF_BOUND;
1390 if (!(a->flags & OAF_STATIC)) {
1392 a->valid_until = now + 3600; /* Block address for 1h */
1395 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1396 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1397 status = DHCPV6_STATUS_NOTONLINK;
1398 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1402 buf += ia_response_len;
1403 buflen -= ia_response_len;
1404 response_len += ia_response_len;
1405 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1408 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1409 response_len + 6 < buflen) {
1411 buf[1] = DHCPV6_OPT_STATUS;
1415 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1419 dhcpv6_write_statefile();
1422 return response_len;