2 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
18 #include "libubox/md5.h"
19 #include "libubox/usock.h"
33 #include <arpa/inet.h>
34 #include <sys/timerfd.h>
37 static void update(struct interface
*iface
);
38 static void reconf_timer(struct uloop_timeout
*event
);
39 static struct uloop_timeout reconf_event
= {.cb
= reconf_timer
};
40 static uint32_t serial
= 0;
41 static uint8_t statemd5
[16];
44 int dhcpv6_ia_init(void)
46 uloop_timeout_set(&reconf_event
, 2000);
51 void free_dhcpv6_assignment(struct dhcpv6_assignment
*c
)
53 if (c
->managed_sock
.fd
.registered
) {
54 ustream_free(&c
->managed_sock
.stream
);
55 close(c
->managed_sock
.fd
.fd
);
68 int setup_dhcpv6_ia_interface(struct interface
*iface
, bool enable
)
70 if (!enable
&& iface
->ia_assignments
.next
) {
71 struct dhcpv6_assignment
*c
;
72 while (!list_empty(&iface
->ia_assignments
)) {
73 c
= list_first_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
74 free_dhcpv6_assignment(c
);
78 if (iface
->dhcpv6
== RELAYD_SERVER
) {
79 if (!iface
->ia_assignments
.next
)
80 INIT_LIST_HEAD(&iface
->ia_assignments
);
82 if (list_empty(&iface
->ia_assignments
)) {
83 struct dhcpv6_assignment
*border
= calloc(1, sizeof(*border
));
85 syslog(LOG_ERR
, "Calloc failed for border on interface %s", iface
->ifname
);
90 list_add(&border
->head
, &iface
->ia_assignments
);
95 // Parse static entries
97 list_for_each_entry(lease
, &leases
, head
) {
99 struct dhcpv6_assignment
*a
= calloc(1, sizeof(*a
) + lease
->duid_len
);
101 syslog(LOG_ERR
, "Calloc failed for static lease assignment on interface %s",
106 a
->clid_len
= lease
->duid_len
;
109 a
->assigned
= lease
->hostid
;
111 uint32_t i4a
= ntohl(lease
->ipaddr
.s_addr
) & 0xff;
112 a
->assigned
= ((i4a
/ 100) << 8) | (((i4a
% 100) / 10) << 4) | (i4a
% 10);
114 odhcpd_urandom(a
->key
, sizeof(a
->key
));
115 memcpy(a
->clid_data
, lease
->duid
, a
->clid_len
);
116 memcpy(a
->mac
, lease
->mac
.ether_addr_octet
, sizeof(a
->mac
));
118 // Assign to all interfaces
119 struct dhcpv6_assignment
*c
;
120 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
121 if (c
->length
!= 128 || c
->assigned
> a
->assigned
) {
122 list_add_tail(&a
->head
, &c
->head
);
124 } else if (c
->assigned
== a
->assigned
) {
125 // Already an assignment with that number
131 if (lease
->hostname
[0]) {
133 a
->hostname
= strdup(lease
->hostname
);
146 static int send_reconf(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
149 struct dhcpv6_client_header hdr
;
153 uint16_t hardware_type
;
158 struct dhcpv6_auth_reconfigure auth
;
161 uint8_t clid_data
[128];
162 } __attribute__((packed
)) reconf_msg
= {
163 .hdr
= {DHCPV6_MSG_RECONFIGURE
, {0, 0, 0}},
164 .srvid_type
= htons(DHCPV6_OPT_SERVERID
),
165 .srvid_len
= htons(10),
166 .duid_type
= htons(3),
167 .hardware_type
= htons(1),
168 .msg_type
= htons(DHCPV6_OPT_RECONF_MSG
),
170 .msg_id
= DHCPV6_MSG_RENEW
,
171 .auth
= {htons(DHCPV6_OPT_AUTH
),
172 htons(sizeof(reconf_msg
.auth
) - 4), 3, 1, 0,
173 {htonl(time(NULL
)), htonl(++serial
)}, 2, {0}},
174 .clid_type
= htons(DHCPV6_OPT_CLIENTID
),
175 .clid_len
= htons(assign
->clid_len
),
179 odhcpd_get_mac(iface
, reconf_msg
.mac
);
180 memcpy(reconf_msg
.clid_data
, assign
->clid_data
, assign
->clid_len
);
181 struct iovec iov
= {&reconf_msg
, sizeof(reconf_msg
) - 128 + assign
->clid_len
};
184 uint8_t secretbytes
[64];
185 memset(secretbytes
, 0, sizeof(secretbytes
));
186 memcpy(secretbytes
, assign
->key
, sizeof(assign
->key
));
188 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
189 secretbytes
[i
] ^= 0x36;
192 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
193 md5_hash(iov
.iov_base
, iov
.iov_len
, &md5
);
194 md5_end(reconf_msg
.auth
.key
, &md5
);
196 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
197 secretbytes
[i
] ^= 0x36;
198 secretbytes
[i
] ^= 0x5c;
202 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
203 md5_hash(reconf_msg
.auth
.key
, 16, &md5
);
204 md5_end(reconf_msg
.auth
.key
, &md5
);
206 return odhcpd_send(iface
->dhcpv6_event
.uloop
.fd
, &assign
->peer
, &iov
, 1, iface
);
210 void dhcpv6_write_statefile(void)
215 if (config
.dhcp_statefile
) {
216 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
217 int fd
= open(config
.dhcp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
221 lockf(fd
, F_LOCK
, 0);
224 FILE *fp
= fdopen(fd
, "w");
230 struct interface
*iface
;
231 list_for_each_entry(iface
, &interfaces
, head
) {
232 if (iface
->dhcpv6
!= RELAYD_SERVER
&& iface
->dhcpv4
!= RELAYD_SERVER
)
235 if (iface
->dhcpv6
== RELAYD_SERVER
&& iface
->ia_assignments
.next
) {
236 struct dhcpv6_assignment
*c
;
237 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
238 if (c
->clid_len
== 0 || c
->managed_size
< 0)
241 char ipbuf
[INET6_ADDRSTRLEN
];
244 odhcpd_hexlify(duidbuf
, c
->clid_data
, c
->clid_len
);
246 // iface DUID iaid hostname lifetime assigned length [addrs...]
247 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s %x %s %u %x %u ",
248 iface
->ifname
, duidbuf
, ntohl(c
->iaid
),
249 (c
->hostname
? c
->hostname
: "-"),
250 (unsigned)(c
->valid_until
> now
?
251 (c
->valid_until
- now
+ wall_time
) : 0),
252 c
->assigned
, (unsigned)c
->length
);
254 struct in6_addr addr
;
255 struct odhcpd_ipaddr
*addrs
= (c
->managed
) ? c
->managed
: iface
->ia_addr
;
256 size_t addrlen
= (c
->managed
) ? (size_t)c
->managed_size
: iface
->ia_addr_len
;
258 for (size_t i
= 0; i
< addrlen
; ++i
) {
259 if (addrs
[i
].prefix
> 96)
262 addr
= addrs
[i
].addr
;
263 if (c
->length
== 128)
264 addr
.s6_addr32
[3] = htonl(c
->assigned
);
266 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
268 inet_ntop(AF_INET6
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
270 if (c
->length
== 128 && c
->hostname
&& i
== 0) {
274 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
275 iface
->search
, b
, sizeof(b
)) > 0)
276 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
278 fprintf(fp
, "\t%s\n", c
->hostname
);
279 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
280 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
283 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/%d ", ipbuf
,
284 (c
->managed_size
) ? addrs
[i
].prefix
: c
->length
);
286 leasebuf
[l
- 1] = '\n';
287 fwrite(leasebuf
, 1, l
, fp
);
291 if (iface
->dhcpv4
== RELAYD_SERVER
&& iface
->dhcpv4_assignments
.next
) {
292 struct dhcpv4_assignment
*c
;
293 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
294 char ipbuf
[INET6_ADDRSTRLEN
];
297 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
299 // iface DUID iaid hostname lifetime assigned length [addrs...]
300 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s ipv4 %s %u %x 32 ",
301 iface
->ifname
, duidbuf
,
302 (c
->hostname
? c
->hostname
: "-"),
303 (unsigned)(c
->valid_until
> now
?
304 (c
->valid_until
- now
+ wall_time
) : 0),
307 struct in_addr addr
= {htonl(c
->addr
)};
308 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
310 if (c
->hostname
[0]) {
314 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
315 iface
->search
, b
, sizeof(b
)) > 0)
316 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
318 fprintf(fp
, "\t%s\n", c
->hostname
);
319 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
320 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
323 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/32 ", ipbuf
);
324 leasebuf
[l
- 1] = '\n';
325 fwrite(leasebuf
, 1, l
, fp
);
334 md5_end(newmd5
, &md5
);
336 if (config
.dhcp_cb
&& memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
337 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
338 char *argv
[2] = {config
.dhcp_cb
, NULL
};
340 execv(argv
[0], argv
);
347 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
349 if (a
->length
> 64 || a
->managed_size
< 0)
352 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
353 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
355 for (size_t i
= 0; i
< addrlen
; ++i
) {
356 struct in6_addr prefix
= addrs
[i
].addr
;
357 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
358 odhcpd_setup_route(&prefix
, (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
359 iface
, &a
->peer
.sin6_addr
, add
);
364 // More data was received from TCP connection
365 static void managed_handle_pd_data(struct ustream
*s
, _unused
int bytes_new
)
367 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
368 time_t now
= odhcpd_time();
369 bool first
= c
->managed_size
< 0;
373 char *data
= ustream_get_read_buf(s
, &pending
);
374 char *end
= memmem(data
, pending
, "\n\n", 2);
383 if (c
->accept_reconf
)
387 for (char *line
= strtok_r(data
, "\n", &saveptr
); line
; line
= strtok_r(NULL
, "\n", &saveptr
)) {
388 c
->managed
= realloc(c
->managed
, (c
->managed_size
+ 1) * sizeof(*c
->managed
));
389 struct odhcpd_ipaddr
*n
= &c
->managed
[c
->managed_size
];
391 char *saveptr2
, *x
= strtok_r(line
, "/", &saveptr2
);
392 if (!x
|| inet_pton(AF_INET6
, x
, &n
->addr
) < 1)
395 x
= strtok_r(NULL
, ",", &saveptr2
);
396 if (sscanf(x
, "%hhu", &n
->prefix
) < 1)
399 x
= strtok_r(NULL
, ",", &saveptr2
);
400 if (sscanf(x
, "%u", &n
->preferred
) < 1)
403 x
= strtok_r(NULL
, ",", &saveptr2
);
404 if (sscanf(x
, "%u", &n
->valid
) < 1)
407 if (n
->preferred
> n
->valid
)
410 if (UINT32_MAX
- now
< n
->preferred
)
411 n
->preferred
= UINT32_MAX
;
415 if (UINT32_MAX
- now
< n
->valid
)
416 n
->valid
= UINT32_MAX
;
420 n
->has_class
= false;
427 ustream_consume(s
, end
- data
);
430 if (first
&& c
->managed_size
== 0)
431 free_dhcpv6_assignment(c
);
433 c
->valid_until
= now
+ 150;
437 // TCP transmission has ended, either because of success or timeout or other error
438 static void managed_handle_pd_done(struct ustream
*s
)
440 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
441 c
->valid_until
= odhcpd_time() + 15;
443 if (c
->accept_reconf
)
449 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
451 struct dhcpv6_assignment
*c
;
453 if (iface
->dhcpv6_pd_manager
[0]) {
454 int fd
= usock(USOCK_UNIX
| USOCK_TCP
, iface
->dhcpv6_pd_manager
, NULL
);
457 odhcpd_hexlify(iaidbuf
, assign
->clid_data
, assign
->clid_len
);
459 assign
->managed_sock
.stream
.notify_read
= managed_handle_pd_data
;
460 assign
->managed_sock
.stream
.notify_state
= managed_handle_pd_done
;
461 ustream_fd_init(&assign
->managed_sock
, fd
);
462 ustream_printf(&assign
->managed_sock
.stream
, "%s,%x\n::/%d,0,0\n\n",
463 iaidbuf
, assign
->iaid
, assign
->length
);
464 ustream_write_pending(&assign
->managed_sock
.stream
);
465 assign
->managed_size
= -1;
466 assign
->valid_until
= odhcpd_time() + 15;
467 list_add(&assign
->head
, &iface
->ia_assignments
);
469 // Wait initial period of up to 250ms for immediate assignment
470 struct pollfd pfd
= { .fd
= fd
, .events
= POLLIN
};
472 managed_handle_pd_data(&assign
->managed_sock
.stream
, 0);
474 if (fcntl(fd
, F_GETFL
) >= 0 && assign
->managed_size
> 0)
479 } else if (iface
->ia_addr_len
< 1) {
483 // Try honoring the hint first
484 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
485 if (assign
->assigned
) {
486 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
487 if (c
->length
== 128 || c
->length
== 0)
490 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
491 list_add_tail(&assign
->head
, &c
->head
);
492 apply_lease(iface
, assign
, true);
496 if (c
->assigned
!= 0)
497 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
501 // Fallback to a variable assignment
503 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
504 if (c
->length
== 128 || c
->length
== 0)
507 current
= (current
+ asize
) & (~asize
);
508 if (current
+ asize
< c
->assigned
) {
509 assign
->assigned
= current
;
510 list_add_tail(&assign
->head
, &c
->head
);
511 apply_lease(iface
, assign
, true);
515 if (c
->assigned
!= 0)
516 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
523 static bool assign_na(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
526 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
527 if (!iface
->ia_addr
[i
].has_class
) {
530 } else if (assign
->classes_cnt
) {
531 for (size_t j
= 0; j
< assign
->classes_cnt
; ++j
)
532 if (assign
->classes
[j
] == iface
->ia_addr
[i
].class)
534 } else if (assign
->all_class
) {
542 // Seed RNG with checksum of DUID
544 for (size_t i
= 0; i
< assign
->clid_len
; ++i
)
545 seed
+= assign
->clid_data
[i
];
548 // Try to assign up to 100x
549 for (size_t i
= 0; i
< 100; ++i
) {
551 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
553 struct dhcpv6_assignment
*c
;
554 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
558 if (c
->assigned
> try || c
->length
!= 128) {
559 assign
->assigned
= try;
560 list_add_tail(&assign
->head
, &c
->head
);
562 } else if (c
->assigned
== try) {
572 static int prefixcmp(const void *va
, const void *vb
)
574 const struct odhcpd_ipaddr
*a
= va
, *b
= vb
;
575 uint32_t a_pref
= ((a
->addr
.s6_addr
[0] & 0xfe) != 0xfc) ? a
->preferred
: 1;
576 uint32_t b_pref
= ((b
->addr
.s6_addr
[0] & 0xfe) != 0xfc) ? b
->preferred
: 1;
577 return (a_pref
< b_pref
) ? 1 : (a_pref
> b_pref
) ? -1 : 0;
581 static void update(struct interface
*iface
)
583 struct odhcpd_ipaddr addr
[8];
584 memset(addr
, 0, sizeof(addr
));
585 int len
= odhcpd_get_interface_addresses(iface
->ifindex
, addr
, 8);
590 qsort(addr
, len
, sizeof(*addr
), prefixcmp
);
592 time_t now
= odhcpd_time();
595 for (int i
= 0; i
< len
; ++i
) {
596 if (addr
[i
].prefix
> minprefix
)
597 minprefix
= addr
[i
].prefix
;
599 addr
[i
].addr
.s6_addr32
[3] = 0;
601 if (addr
[i
].preferred
< UINT32_MAX
- now
)
602 addr
[i
].preferred
+= now
;
604 if (addr
[i
].valid
< UINT32_MAX
- now
)
605 addr
[i
].valid
+= now
;
608 struct dhcpv6_assignment
*border
= list_last_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
609 border
->assigned
= 1 << (64 - minprefix
);
611 bool change
= len
!= (int)iface
->ia_addr_len
;
612 for (int i
= 0; !change
&& i
< len
; ++i
)
613 if (addr
[i
].addr
.s6_addr32
[0] != iface
->ia_addr
[i
].addr
.s6_addr32
[0] ||
614 addr
[i
].addr
.s6_addr32
[1] != iface
->ia_addr
[i
].addr
.s6_addr32
[1] ||
615 (addr
[i
].preferred
> 0) != (iface
->ia_addr
[i
].preferred
> 0) ||
616 (addr
[i
].valid
> (uint32_t)now
+ 7200) !=
617 (iface
->ia_addr
[i
].valid
> (uint32_t)now
+ 7200))
621 struct dhcpv6_assignment
*c
;
622 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
624 apply_lease(iface
, c
, false);
627 memcpy(iface
->ia_addr
, addr
, len
* sizeof(*addr
));
628 iface
->ia_addr_len
= len
;
630 if (change
) { // Addresses / prefixes have changed
631 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
632 struct dhcpv6_assignment
*c
, *d
;
633 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
634 if (c
->clid_len
== 0 || c
->valid_until
< now
|| c
->managed_size
)
637 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
638 list_move(&c
->head
, &reassign
);
639 else if (c
!= border
)
640 apply_lease(iface
, c
, true);
642 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
644 c
->reconf_sent
= now
;
645 send_reconf(iface
, c
);
647 // Leave all other assignments of that client alone
648 struct dhcpv6_assignment
*a
;
649 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
650 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
651 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
652 c
->reconf_cnt
= INT_MAX
;
656 while (!list_empty(&reassign
)) {
657 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
659 if (!assign_pd(iface
, c
)) {
661 list_add(&c
->head
, &iface
->ia_assignments
);
665 dhcpv6_write_statefile();
670 static void reconf_timer(struct uloop_timeout
*event
)
672 time_t now
= odhcpd_time();
673 struct interface
*iface
;
674 list_for_each_entry(iface
, &interfaces
, head
) {
675 if (iface
->dhcpv6
!= RELAYD_SERVER
|| iface
->ia_assignments
.next
== NULL
)
678 struct dhcpv6_assignment
*a
, *n
;
679 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
680 if (a
->valid_until
< now
) {
681 if ((a
->length
< 128 && a
->clid_len
> 0) ||
682 (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);
698 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
699 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
700 struct interface
*iface
, bool request
)
702 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
705 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
706 size_t datalen
= sizeof(out
);
707 time_t now
= odhcpd_time();
710 struct __attribute__((packed
)) {
714 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
717 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
718 datalen
+= sizeof(stat
);
721 uint32_t pref
= 3600;
722 uint32_t valid
= 3600;
724 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
725 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
727 for (size_t i
= 0; i
< addrlen
; ++i
) {
729 if (addrs
[i
].has_class
) {
731 if (a
->classes_cnt
) {
732 for (size_t j
= 0; j
< a
->classes_cnt
; ++j
)
733 if (a
->classes
[j
] == addrs
[i
].class)
735 } else if (a
->all_class
) {
743 uint32_t prefix_pref
= addrs
[i
].preferred
- now
;
744 uint32_t prefix_valid
= addrs
[i
].valid
- now
;
746 if (addrs
[i
].prefix
> 96 ||
747 addrs
[i
].preferred
<= (uint32_t)now
)
750 if (prefix_pref
> 86400)
753 if (prefix_valid
> 86400)
754 prefix_valid
= 86400;
756 #ifdef DHCPV6_OPT_PREFIX_CLASS
761 } pclass
= {htons(DHCPV6_OPT_PREFIX_CLASS
),
762 htons(2), htons(iface
->ia_addr
[i
].class)};
765 if (a
->length
< 128) {
766 struct dhcpv6_ia_prefix p
= {
767 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
768 .len
= htons(sizeof(p
) - 4),
769 .preferred
= htonl(prefix_pref
),
770 .valid
= htonl(prefix_valid
),
771 .prefix
= (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
772 .addr
= addrs
[i
].addr
774 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
776 size_t entrlen
= sizeof(p
) - 4;
778 #ifdef DHCPV6_OPT_PREFIX_CLASS
779 if (iface
->ia_addr
[i
].has_class
) {
780 entrlen
+= sizeof(pclass
);
781 p
.len
= htons(entrlen
);
785 if (datalen
+ entrlen
+ 4 > buflen
||
786 (a
->assigned
== 0 && a
->managed_size
== 0))
789 memcpy(buf
+ datalen
, &p
, sizeof(p
));
790 #ifdef DHCPV6_OPT_PREFIX_CLASS
791 memcpy(buf
+ datalen
+ sizeof(p
), &pclass
, sizeof(pclass
));
793 datalen
+= entrlen
+ 4;
795 struct dhcpv6_ia_addr n
= {
796 .type
= htons(DHCPV6_OPT_IA_ADDR
),
797 .len
= htons(sizeof(n
) - 4),
798 .addr
= addrs
[i
].addr
,
799 .preferred
= htonl(prefix_pref
),
800 .valid
= htonl(prefix_valid
)
802 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
803 size_t entrlen
= sizeof(n
) - 4;
805 #ifdef DHCPV6_OPT_PREFIX_CLASS
806 if (iface
->ia_addr
[i
].has_class
) {
807 entrlen
+= sizeof(pclass
);
808 n
.len
= htons(entrlen
);
812 if (datalen
+ entrlen
+ 4 > buflen
|| a
->assigned
== 0)
815 memcpy(buf
+ datalen
, &n
, sizeof(n
));
816 #ifdef DHCPV6_OPT_PREFIX_CLASS
817 memcpy(buf
+ datalen
+ sizeof(n
), &pclass
, sizeof(pclass
));
819 datalen
+= entrlen
+ 4;
822 // Calculate T1 / T2 based on non-deprecated addresses
823 if (prefix_pref
> 0) {
824 if (prefix_pref
< pref
)
827 if (prefix_valid
< valid
)
828 valid
= prefix_valid
;
832 a
->valid_until
= valid
+ now
;
833 out
.t1
= htonl(pref
* 5 / 10);
834 out
.t2
= htonl(pref
* 8 / 10);
844 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
845 uint16_t otype
, olen
;
846 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
847 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
848 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
849 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
850 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
855 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
856 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
858 for (size_t i
= 0; i
< addrlen
; ++i
) {
859 if (addrs
[i
].prefix
> 96 ||
860 addrs
[i
].preferred
<= (uint32_t)now
)
863 struct in6_addr addr
= addrs
[i
].addr
;
864 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
865 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
867 if (!memcmp(&p
->addr
, &addr
, sizeof(addr
)) &&
868 p
->prefix
== a
->length
)
871 addr
.s6_addr32
[3] = htonl(a
->assigned
);
873 if (!memcmp(&n
->addr
, &addr
, sizeof(addr
)))
880 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
881 struct dhcpv6_ia_prefix inv
= {
882 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
883 .len
= htons(sizeof(inv
) - 4),
890 if (datalen
+ sizeof(inv
) > buflen
)
893 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
894 datalen
+= sizeof(inv
);
896 struct dhcpv6_ia_addr inv
= {
897 .type
= htons(DHCPV6_OPT_IA_ADDR
),
898 .len
= htons(sizeof(inv
) - 4),
904 if (datalen
+ sizeof(inv
) > buflen
)
907 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
908 datalen
+= sizeof(inv
);
915 out
.len
= htons(datalen
- 4);
916 memcpy(buf
, &out
, sizeof(out
));
921 ssize_t
dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
922 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
924 time_t now
= odhcpd_time();
925 size_t response_len
= 0;
926 const struct dhcpv6_client_header
*hdr
= data
;
927 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
928 uint16_t otype
, olen
;
930 // Find and parse client-id and hostname
931 bool accept_reconf
= false;
932 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
934 size_t hostname_len
= 0;
935 bool class_oro
= false;
936 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
937 if (otype
== DHCPV6_OPT_CLIENTID
) {
941 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
942 memcpy(mac
, &odata
[8], sizeof(mac
));
943 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
944 memcpy(mac
, &odata
[4], sizeof(mac
));
945 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
946 uint8_t fqdn_buf
[256];
947 memcpy(fqdn_buf
, odata
, olen
);
948 fqdn_buf
[olen
++] = 0;
950 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
951 hostname_len
= strcspn(hostname
, ".");
952 } else if (otype
== DHCPV6_OPT_ORO
) {
953 #ifdef DHCPV6_OPT_PREFIX_CLASS
954 for (size_t i
= 0; i
+ 1 < olen
; i
+= 2) {
955 if (odata
[i
] == (DHCPV6_OPT_PREFIX_CLASS
>> 8) &&
956 odata
[i
+ 1] == (DHCPV6_OPT_PREFIX_CLASS
& 0xff))
960 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
961 accept_reconf
= true;
965 if (!clid_data
|| !clid_len
|| clid_len
> 130)
969 bool update_state
= false;
971 struct dhcpv6_assignment
*first
= NULL
;
972 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
973 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
974 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
975 bool ia_addr_present
= false;
976 if (!is_pd
&& !is_na
)
979 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
980 size_t ia_response_len
= 0;
981 uint8_t reqlen
= (is_pd
) ? 62 : 128;
982 uint32_t reqhint
= 0;
984 const uint8_t classes_max
= 32;
985 uint8_t classes_cnt
= 0;
986 uint16_t classes
[classes_max
];
988 // Parse request hint for IA-PD
991 uint16_t stype
, slen
;
992 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
993 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
996 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
999 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
1000 if (reqlen
> 32 && reqlen
<= 64)
1001 reqhint
&= (1U << (64 - reqlen
)) - 1;
1004 #ifdef DHCPV6_OPT_PREFIX_CLASS
1006 uint16_t xtype
, xlen
;
1007 dhcpv6_for_each_option(&p
[1], sdata
+ slen
, xtype
, xlen
, xdata
) {
1008 if (xtype
!= DHCPV6_OPT_PREFIX_CLASS
|| xlen
!= 2)
1011 if (classes_cnt
>= classes_max
)
1014 classes
[classes_cnt
++] = (uint16_t)xdata
[0] << 8 | (uint16_t)xdata
[1];
1023 uint16_t stype
, slen
;
1024 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1025 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
1028 ia_addr_present
= true;
1029 #ifdef DHCPV6_OPT_PREFIX_CLASS
1031 uint16_t xtype
, xlen
;
1032 struct dhcpv6_ia_addr
*p
= (struct dhcpv6_ia_addr
*)&sdata
[-4];
1033 dhcpv6_for_each_option(&p
[1], sdata
+ slen
, xtype
, xlen
, xdata
) {
1034 if (xtype
!= DHCPV6_OPT_PREFIX_CLASS
|| xlen
!= 2)
1037 if (classes_cnt
>= classes_max
)
1040 classes
[classes_cnt
++] = (uint16_t)xdata
[0] << 8 | (uint16_t)xdata
[1];
1047 struct dhcpv6_assignment
*c
, *a
= NULL
;
1048 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
1049 if (((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) ||
1050 (c
->clid_len
>= clid_len
&& !c
->clid_data
[0] && !c
->clid_data
[1]
1051 && !memcmp(c
->mac
, mac
, sizeof(mac
)))) &&
1052 (c
->iaid
== ia
->iaid
|| c
->valid_until
< now
) &&
1053 ((is_pd
&& c
->length
<= 64) || (is_na
&& c
->length
== 128))) {
1057 apply_lease(iface
, a
, false);
1058 memcpy(a
->clid_data
, clid_data
, clid_len
);
1059 a
->clid_len
= clid_len
;
1064 a
->all_class
= class_oro
;
1065 a
->classes_cnt
= classes_cnt
;
1066 a
->classes
= realloc(a
->classes
, classes_cnt
* sizeof(uint16_t));
1068 memcpy(a
->classes
, classes
, classes_cnt
* sizeof(uint16_t));
1073 // Generic message handling
1074 uint16_t status
= DHCPV6_STATUS_OK
;
1075 if (a
&& a
->managed_size
< 0) {
1077 } else if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
|| hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1078 bool assigned
= !!a
;
1080 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
1081 a
= calloc(1, sizeof(*a
) + clid_len
);
1083 a
->clid_len
= clid_len
;
1087 a
->assigned
= reqhint
;
1088 a
->all_class
= class_oro
;
1089 a
->classes_cnt
= classes_cnt
;
1091 a
->classes
= malloc(classes_cnt
* sizeof(uint16_t));
1093 memcpy(a
->classes
, classes
, classes_cnt
* sizeof(uint16_t));
1097 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
1099 odhcpd_urandom(a
->key
, sizeof(a
->key
));
1100 memcpy(a
->clid_data
, clid_data
, clid_len
);
1103 while (!(assigned
= assign_pd(iface
, a
)) &&
1104 !a
->managed_size
&& ++a
->length
<= 64);
1106 assigned
= assign_na(iface
, a
);
1108 if (a
->managed_size
&& !assigned
)
1113 if (!assigned
|| iface
->ia_addr_len
== 0) { // Set error status
1114 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
1115 } else if (assigned
&& !first
) { //
1116 size_t handshake_len
= 4;
1118 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
1122 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1123 struct dhcpv6_auth_reconfigure auth
= {
1124 htons(DHCPV6_OPT_AUTH
),
1125 htons(sizeof(auth
) - 4),
1127 {htonl(time(NULL
)), htonl(++serial
)},
1131 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
1132 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
1133 handshake_len
+= sizeof(auth
);
1136 buf
+= handshake_len
;
1137 buflen
-= handshake_len
;
1138 response_len
+= handshake_len
;
1143 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1145 // Was only a solicitation: mark binding for removal
1146 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
1148 } else if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1149 if (hostname_len
> 0) {
1150 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
1152 memcpy(a
->hostname
, hostname
, hostname_len
);
1153 a
->hostname
[hostname_len
] = 0;
1156 a
->accept_reconf
= accept_reconf
;
1157 apply_lease(iface
, a
, true);
1158 update_state
= true;
1159 } else if (!assigned
&& a
&& a
->managed_size
== 0) { // Cleanup failed assignment
1160 free_dhcpv6_assignment(a
);
1162 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1163 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1164 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1165 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1166 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1167 status
= DHCPV6_STATUS_NOBINDING
;
1168 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1169 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1170 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1171 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1173 apply_lease(iface
, a
, true);
1174 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1176 apply_lease(iface
, a
, false);
1177 update_state
= true;
1178 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128) {
1180 a
->valid_until
= now
+ 3600; // Block address for 1h
1181 update_state
= true;
1183 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
&& ia_addr_present
) {
1184 // Send NOTONLINK for CONFIRM with addr present so that clients restart connection
1185 status
= DHCPV6_STATUS_NOTONLINK
;
1186 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1189 buf
+= ia_response_len
;
1190 buflen
-= ia_response_len
;
1191 response_len
+= ia_response_len
;
1194 if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
&& response_len
+ 6 < buflen
) {
1196 buf
[1] = DHCPV6_OPT_STATUS
;
1200 buf
[5] = DHCPV6_STATUS_OK
;
1205 dhcpv6_write_statefile();
1208 return response_len
;