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
;
259 for (size_t i
= 0; i
< addrlen
; ++i
)
260 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
261 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
262 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
265 for (size_t i
= 0; i
< addrlen
; ++i
) {
266 if (addrs
[i
].prefix
> 96 || c
->valid_until
<= now
||
267 (iface
->managed
< RELAYD_MANAGED_NO_AFLAG
&& i
!= m
))
270 addr
= addrs
[i
].addr
;
271 if (c
->length
== 128)
272 addr
.s6_addr32
[3] = htonl(c
->assigned
);
274 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
276 inet_ntop(AF_INET6
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
278 if (c
->length
== 128 && c
->hostname
) {
282 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
283 iface
->search
, b
, sizeof(b
)) > 0)
284 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
286 fprintf(fp
, "\t%s\n", c
->hostname
);
287 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
288 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
291 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/%d ", ipbuf
,
292 (c
->managed_size
) ? addrs
[i
].prefix
: c
->length
);
294 leasebuf
[l
- 1] = '\n';
295 fwrite(leasebuf
, 1, l
, fp
);
299 if (iface
->dhcpv4
== RELAYD_SERVER
&& iface
->dhcpv4_assignments
.next
) {
300 struct dhcpv4_assignment
*c
;
301 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
302 char ipbuf
[INET6_ADDRSTRLEN
];
305 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
307 // iface DUID iaid hostname lifetime assigned length [addrs...]
308 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s ipv4 %s %u %x 32 ",
309 iface
->ifname
, duidbuf
,
310 (c
->hostname
? c
->hostname
: "-"),
311 (unsigned)(c
->valid_until
> now
?
312 (c
->valid_until
- now
+ wall_time
) : 0),
315 struct in_addr addr
= {htonl(c
->addr
)};
316 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
318 if (c
->hostname
[0]) {
322 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
323 iface
->search
, b
, sizeof(b
)) > 0)
324 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
326 fprintf(fp
, "\t%s\n", c
->hostname
);
327 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
328 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
331 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/32 ", ipbuf
);
332 leasebuf
[l
- 1] = '\n';
333 fwrite(leasebuf
, 1, l
, fp
);
342 md5_end(newmd5
, &md5
);
344 if (config
.dhcp_cb
&& memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
345 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
346 char *argv
[2] = {config
.dhcp_cb
, NULL
};
348 execv(argv
[0], argv
);
355 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
357 if (a
->length
> 64 || a
->managed_size
< 0)
360 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
361 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
363 for (size_t i
= 0; i
< addrlen
; ++i
) {
364 struct in6_addr prefix
= addrs
[i
].addr
;
365 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
366 odhcpd_setup_route(&prefix
, (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
367 iface
, &a
->peer
.sin6_addr
, add
);
372 // More data was received from TCP connection
373 static void managed_handle_pd_data(struct ustream
*s
, _unused
int bytes_new
)
375 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
376 time_t now
= odhcpd_time();
377 bool first
= c
->managed_size
< 0;
381 char *data
= ustream_get_read_buf(s
, &pending
);
382 char *end
= memmem(data
, pending
, "\n\n", 2);
391 if (c
->accept_reconf
)
395 for (char *line
= strtok_r(data
, "\n", &saveptr
); line
; line
= strtok_r(NULL
, "\n", &saveptr
)) {
396 c
->managed
= realloc(c
->managed
, (c
->managed_size
+ 1) * sizeof(*c
->managed
));
397 struct odhcpd_ipaddr
*n
= &c
->managed
[c
->managed_size
];
399 char *saveptr2
, *x
= strtok_r(line
, "/", &saveptr2
);
400 if (!x
|| inet_pton(AF_INET6
, x
, &n
->addr
) < 1)
403 x
= strtok_r(NULL
, ",", &saveptr2
);
404 if (sscanf(x
, "%hhu", &n
->prefix
) < 1)
407 x
= strtok_r(NULL
, ",", &saveptr2
);
408 if (sscanf(x
, "%u", &n
->preferred
) < 1)
411 x
= strtok_r(NULL
, ",", &saveptr2
);
412 if (sscanf(x
, "%u", &n
->valid
) < 1)
415 if (n
->preferred
> n
->valid
)
418 if (UINT32_MAX
- now
< n
->preferred
)
419 n
->preferred
= UINT32_MAX
;
423 if (UINT32_MAX
- now
< n
->valid
)
424 n
->valid
= UINT32_MAX
;
433 ustream_consume(s
, end
- data
);
436 if (first
&& c
->managed_size
== 0)
437 free_dhcpv6_assignment(c
);
439 c
->valid_until
= now
+ 150;
443 // TCP transmission has ended, either because of success or timeout or other error
444 static void managed_handle_pd_done(struct ustream
*s
)
446 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
447 c
->valid_until
= odhcpd_time() + 15;
449 if (c
->accept_reconf
)
455 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
457 struct dhcpv6_assignment
*c
;
459 if (iface
->dhcpv6_pd_manager
[0]) {
460 int fd
= usock(USOCK_UNIX
| USOCK_TCP
, iface
->dhcpv6_pd_manager
, NULL
);
463 odhcpd_hexlify(iaidbuf
, assign
->clid_data
, assign
->clid_len
);
465 assign
->managed_sock
.stream
.notify_read
= managed_handle_pd_data
;
466 assign
->managed_sock
.stream
.notify_state
= managed_handle_pd_done
;
467 ustream_fd_init(&assign
->managed_sock
, fd
);
468 ustream_printf(&assign
->managed_sock
.stream
, "%s,%x\n::/%d,0,0\n\n",
469 iaidbuf
, assign
->iaid
, assign
->length
);
470 ustream_write_pending(&assign
->managed_sock
.stream
);
471 assign
->managed_size
= -1;
472 assign
->valid_until
= odhcpd_time() + 15;
473 list_add(&assign
->head
, &iface
->ia_assignments
);
475 // Wait initial period of up to 250ms for immediate assignment
476 struct pollfd pfd
= { .fd
= fd
, .events
= POLLIN
};
478 managed_handle_pd_data(&assign
->managed_sock
.stream
, 0);
480 if (fcntl(fd
, F_GETFL
) >= 0 && assign
->managed_size
> 0)
485 } else if (iface
->ia_addr_len
< 1) {
489 // Try honoring the hint first
490 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
491 if (assign
->assigned
) {
492 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
493 if (c
->length
== 128 || c
->length
== 0)
496 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
497 list_add_tail(&assign
->head
, &c
->head
);
498 apply_lease(iface
, assign
, true);
502 if (c
->assigned
!= 0)
503 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
507 // Fallback to a variable assignment
509 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
510 if (c
->length
== 128 || c
->length
== 0)
513 current
= (current
+ asize
) & (~asize
);
514 if (current
+ asize
< c
->assigned
) {
515 assign
->assigned
= current
;
516 list_add_tail(&assign
->head
, &c
->head
);
517 apply_lease(iface
, assign
, true);
521 if (c
->assigned
!= 0)
522 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) {
561 static int prefixcmp(const void *va
, const void *vb
)
563 const struct odhcpd_ipaddr
*a
= va
, *b
= vb
;
564 uint32_t a_pref
= ((a
->addr
.s6_addr
[0] & 0xfe) != 0xfc) ? a
->preferred
: 1;
565 uint32_t b_pref
= ((b
->addr
.s6_addr
[0] & 0xfe) != 0xfc) ? b
->preferred
: 1;
566 return (a_pref
< b_pref
) ? 1 : (a_pref
> b_pref
) ? -1 : 0;
570 static void update(struct interface
*iface
)
572 struct odhcpd_ipaddr addr
[8];
573 memset(addr
, 0, sizeof(addr
));
574 int len
= odhcpd_get_interface_addresses(iface
->ifindex
, addr
, 8);
579 qsort(addr
, len
, sizeof(*addr
), prefixcmp
);
581 time_t now
= odhcpd_time();
584 for (int i
= 0; i
< len
; ++i
) {
585 if (addr
[i
].preferred
> 0 && addr
[i
].prefix
> minprefix
)
586 minprefix
= addr
[i
].prefix
;
588 addr
[i
].addr
.s6_addr32
[3] = 0;
590 if (addr
[i
].preferred
< UINT32_MAX
- now
)
591 addr
[i
].preferred
+= now
;
593 if (addr
[i
].valid
< UINT32_MAX
- now
)
594 addr
[i
].valid
+= now
;
597 struct dhcpv6_assignment
*border
= list_last_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
598 border
->assigned
= 1 << (64 - minprefix
);
600 bool change
= len
!= (int)iface
->ia_addr_len
;
601 for (int i
= 0; !change
&& i
< len
; ++i
)
602 if (addr
[i
].addr
.s6_addr32
[0] != iface
->ia_addr
[i
].addr
.s6_addr32
[0] ||
603 addr
[i
].addr
.s6_addr32
[1] != iface
->ia_addr
[i
].addr
.s6_addr32
[1] ||
604 (addr
[i
].preferred
> 0) != (iface
->ia_addr
[i
].preferred
> 0) ||
605 (addr
[i
].valid
> (uint32_t)now
+ 7200) !=
606 (iface
->ia_addr
[i
].valid
> (uint32_t)now
+ 7200))
610 struct dhcpv6_assignment
*c
;
611 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
612 if (c
!= border
&& !iface
->managed
)
613 apply_lease(iface
, c
, false);
616 memcpy(iface
->ia_addr
, addr
, len
* sizeof(*addr
));
617 iface
->ia_addr_len
= len
;
619 if (change
) { // Addresses / prefixes have changed
620 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
621 struct dhcpv6_assignment
*c
, *d
;
622 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
623 if (c
->clid_len
== 0 || c
->valid_until
< now
|| c
->managed_size
)
626 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
627 list_move(&c
->head
, &reassign
);
628 else if (c
!= border
)
629 apply_lease(iface
, c
, true);
631 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
633 c
->reconf_sent
= now
;
634 send_reconf(iface
, c
);
636 // Leave all other assignments of that client alone
637 struct dhcpv6_assignment
*a
;
638 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
639 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
640 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
641 c
->reconf_cnt
= INT_MAX
;
645 while (!list_empty(&reassign
)) {
646 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
648 if (!assign_pd(iface
, c
)) {
650 list_add(&c
->head
, &iface
->ia_assignments
);
654 dhcpv6_write_statefile();
659 static void reconf_timer(struct uloop_timeout
*event
)
661 time_t now
= odhcpd_time();
662 struct interface
*iface
;
663 list_for_each_entry(iface
, &interfaces
, head
) {
664 if (iface
->dhcpv6
!= RELAYD_SERVER
|| iface
->ia_assignments
.next
== NULL
)
667 struct dhcpv6_assignment
*a
, *n
;
668 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
669 if (a
->valid_until
< now
) {
670 if ((a
->length
< 128 && a
->clid_len
> 0) ||
671 (a
->length
== 128 && a
->clid_len
== 0)) {
673 free_dhcpv6_assignment(a
);
675 } else if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< 8 &&
676 now
> a
->reconf_sent
+ (1 << a
->reconf_cnt
)) {
678 a
->reconf_sent
= now
;
679 send_reconf(iface
, a
);
683 uloop_timeout_set(event
, 2000);
687 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
688 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
689 struct interface
*iface
, bool request
)
691 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
694 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
695 size_t datalen
= sizeof(out
);
696 time_t now
= odhcpd_time();
699 struct __attribute__((packed
)) {
703 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
706 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
707 datalen
+= sizeof(stat
);
710 uint32_t leasetime
= iface
->dhcpv4_leasetime
;
713 else if (leasetime
< 60)
716 uint32_t pref
= leasetime
;
717 uint32_t valid
= leasetime
;
719 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
720 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
723 for (size_t i
= 0; i
< addrlen
; ++i
)
724 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
725 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
726 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
729 for (size_t i
= 0; i
< addrlen
; ++i
) {
730 uint32_t prefix_pref
= addrs
[i
].preferred
- now
;
731 uint32_t prefix_valid
= addrs
[i
].valid
- now
;
733 if (addrs
[i
].prefix
> 96 ||
734 addrs
[i
].preferred
<= (uint32_t)now
)
737 if (a
->length
< 128) {
738 struct dhcpv6_ia_prefix p
= {
739 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
740 .len
= htons(sizeof(p
) - 4),
741 .preferred
= htonl(prefix_pref
),
742 .valid
= htonl(prefix_valid
),
743 .prefix
= (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
744 .addr
= addrs
[i
].addr
746 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
748 size_t entrlen
= sizeof(p
) - 4;
750 if (datalen
+ entrlen
+ 4 > buflen
||
751 (a
->assigned
== 0 && a
->managed_size
== 0))
754 memcpy(buf
+ datalen
, &p
, sizeof(p
));
755 datalen
+= entrlen
+ 4;
757 struct dhcpv6_ia_addr n
= {
758 .type
= htons(DHCPV6_OPT_IA_ADDR
),
759 .len
= htons(sizeof(n
) - 4),
760 .addr
= addrs
[i
].addr
,
761 .preferred
= htonl(prefix_pref
),
762 .valid
= htonl(prefix_valid
)
764 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
765 size_t entrlen
= sizeof(n
) - 4;
767 if (iface
->managed
< RELAYD_MANAGED_NO_AFLAG
&& i
!= m
)
770 if (datalen
+ entrlen
+ 4 > buflen
|| a
->assigned
== 0)
773 memcpy(buf
+ datalen
, &n
, sizeof(n
));
774 datalen
+= entrlen
+ 4;
777 // Calculate T1 / T2 based on non-deprecated addresses
778 if (prefix_pref
> 0) {
779 if (prefix_pref
< pref
)
782 if (prefix_valid
< valid
)
783 valid
= prefix_valid
;
787 a
->valid_until
= valid
+ now
;
788 out
.t1
= htonl(pref
* 5 / 10);
789 out
.t2
= htonl(pref
* 8 / 10);
799 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
800 uint16_t otype
, olen
;
801 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
802 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
803 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
804 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
805 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
810 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
811 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
813 for (size_t i
= 0; i
< addrlen
; ++i
) {
814 if (addrs
[i
].prefix
> 96 ||
815 addrs
[i
].preferred
<= (uint32_t)now
)
818 struct in6_addr addr
= addrs
[i
].addr
;
819 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
820 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
822 if (!memcmp(&p
->addr
, &addr
, sizeof(addr
)) &&
823 p
->prefix
== ((a
->managed
) ? addrs
[i
].prefix
: a
->length
))
826 addr
.s6_addr32
[3] = htonl(a
->assigned
);
828 if (!memcmp(&n
->addr
, &addr
, sizeof(addr
)))
835 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
836 struct dhcpv6_ia_prefix inv
= {
837 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
838 .len
= htons(sizeof(inv
) - 4),
845 if (datalen
+ sizeof(inv
) > buflen
)
848 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
849 datalen
+= sizeof(inv
);
851 struct dhcpv6_ia_addr inv
= {
852 .type
= htons(DHCPV6_OPT_IA_ADDR
),
853 .len
= htons(sizeof(inv
) - 4),
859 if (datalen
+ sizeof(inv
) > buflen
)
862 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
863 datalen
+= sizeof(inv
);
870 out
.len
= htons(datalen
- 4);
871 memcpy(buf
, &out
, sizeof(out
));
876 static void dhcpv6_log(uint8_t msgtype
, struct interface
*iface
, time_t now
,
877 const char *duidbuf
, bool is_pd
, struct dhcpv6_assignment
*a
, int code
)
879 const char *type
= "UNKNOWN";
880 const char *status
= "UNKNOWN";
882 if (msgtype
== DHCPV6_MSG_RENEW
)
886 case DHCPV6_MSG_SOLICIT
:
889 case DHCPV6_MSG_REQUEST
:
892 case DHCPV6_MSG_CONFIRM
:
895 case DHCPV6_MSG_RENEW
:
898 case DHCPV6_MSG_REBIND
:
901 case DHCPV6_MSG_RELEASE
:
904 case DHCPV6_MSG_DECLINE
:
910 case DHCPV6_STATUS_OK
:
913 case DHCPV6_STATUS_NOADDRSAVAIL
:
914 status
= "no addresses available";
916 case DHCPV6_STATUS_NOBINDING
:
917 status
= "no binding";
919 case DHCPV6_STATUS_NOTONLINK
:
920 status
= "not on-link";
922 case DHCPV6_STATUS_NOPREFIXAVAIL
:
923 status
= "no prefix available";
927 char leasebuf
[256] = "";
930 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
931 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
933 char addrbuf
[INET6_ADDRSTRLEN
];
935 for (size_t i
= 0; i
< addrlen
; ++i
) {
936 if (addrs
[i
].prefix
> 96 || addrs
[i
].preferred
<= (uint32_t)now
)
939 struct in6_addr addr
= addrs
[i
].addr
;
940 int prefix
= a
->managed
? addrs
[i
].prefix
: a
->length
;
942 addr
.s6_addr32
[3] = htonl(a
->assigned
);
944 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
946 inet_ntop(AF_INET6
, &addr
, addrbuf
, sizeof(addrbuf
));
947 lbsize
+= snprintf(leasebuf
+ lbsize
, sizeof(leasebuf
) - lbsize
, "%s/%d ", addrbuf
, prefix
);
951 syslog(LOG_WARNING
, "DHCPV6 %s %s from %s on %s: %s %s", type
, (is_pd
) ? "IA_PD" : "IA_NA",
952 duidbuf
, iface
->ifname
, status
, leasebuf
);
957 ssize_t
dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
958 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
960 time_t now
= odhcpd_time();
961 size_t response_len
= 0;
962 const struct dhcpv6_client_header
*hdr
= data
;
963 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
964 uint16_t otype
, olen
;
966 // Find and parse client-id and hostname
967 bool accept_reconf
= false;
968 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
970 size_t hostname_len
= 0;
971 bool notonlink
= false;
974 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
975 if (otype
== DHCPV6_OPT_CLIENTID
) {
979 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
980 memcpy(mac
, &odata
[8], sizeof(mac
));
981 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
982 memcpy(mac
, &odata
[4], sizeof(mac
));
985 odhcpd_hexlify(duidbuf
, odata
, olen
);
986 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
987 uint8_t fqdn_buf
[256];
988 memcpy(fqdn_buf
, odata
, olen
);
989 fqdn_buf
[olen
++] = 0;
991 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
992 hostname_len
= strcspn(hostname
, ".");
993 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
994 accept_reconf
= true;
998 if (!clid_data
|| !clid_len
|| clid_len
> 130)
1003 struct dhcpv6_assignment
*first
= NULL
;
1004 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1005 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
1006 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
1007 bool ia_addr_present
= false;
1008 if (!is_pd
&& !is_na
)
1011 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
1012 size_t ia_response_len
= 0;
1013 uint8_t reqlen
= (is_pd
) ? 62 : 128;
1014 uint32_t reqhint
= 0;
1016 // Parse request hint for IA-PD
1019 uint16_t stype
, slen
;
1020 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1021 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
1024 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
1027 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
1028 if (reqlen
> 32 && reqlen
<= 64)
1029 reqhint
&= (1U << (64 - reqlen
)) - 1;
1037 uint16_t stype
, slen
;
1038 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1039 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
1042 ia_addr_present
= true;
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
;
1068 // Generic message handling
1069 uint16_t status
= DHCPV6_STATUS_OK
;
1070 if (a
&& a
->managed_size
< 0) {
1072 } else if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
|| hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1073 bool assigned
= !!a
;
1075 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
1076 a
= calloc(1, sizeof(*a
) + clid_len
);
1078 a
->clid_len
= clid_len
;
1082 a
->assigned
= reqhint
;
1085 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
1087 odhcpd_urandom(a
->key
, sizeof(a
->key
));
1088 memcpy(a
->clid_data
, clid_data
, clid_len
);
1091 while (!(assigned
= assign_pd(iface
, a
)) &&
1092 !a
->managed_size
&& ++a
->length
<= 64);
1094 assigned
= assign_na(iface
, a
);
1096 if (a
->managed_size
&& !assigned
)
1101 if (!assigned
|| iface
->ia_addr_len
== 0) { // Set error status
1102 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
1103 } else if (assigned
&& !first
) { //
1104 size_t handshake_len
= 4;
1106 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
1110 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1111 struct dhcpv6_auth_reconfigure auth
= {
1112 htons(DHCPV6_OPT_AUTH
),
1113 htons(sizeof(auth
) - 4),
1115 {htonl(time(NULL
)), htonl(++serial
)},
1119 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
1120 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
1121 handshake_len
+= sizeof(auth
);
1124 buf
+= handshake_len
;
1125 buflen
-= handshake_len
;
1126 response_len
+= handshake_len
;
1131 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1133 // Was only a solicitation: mark binding for removal
1134 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
1136 } else if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1137 if (hostname_len
> 0) {
1138 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
1140 memcpy(a
->hostname
, hostname
, hostname_len
);
1141 a
->hostname
[hostname_len
] = 0;
1144 a
->accept_reconf
= accept_reconf
;
1145 apply_lease(iface
, a
, true);
1146 } else if (!assigned
&& a
&& a
->managed_size
== 0) { // Cleanup failed assignment
1147 free_dhcpv6_assignment(a
);
1149 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1150 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1151 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1152 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1153 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1154 status
= DHCPV6_STATUS_NOBINDING
;
1155 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1156 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1157 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1158 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1160 apply_lease(iface
, a
, true);
1161 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1163 apply_lease(iface
, a
, false);
1164 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128) {
1166 a
->valid_until
= now
+ 3600; // Block address for 1h
1168 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
&& ia_addr_present
) {
1169 // Send NOTONLINK for CONFIRM with addr present so that clients restart connection
1170 status
= DHCPV6_STATUS_NOTONLINK
;
1171 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1175 buf
+= ia_response_len
;
1176 buflen
-= ia_response_len
;
1177 response_len
+= ia_response_len
;
1178 dhcpv6_log(hdr
->msg_type
, iface
, now
, duidbuf
, is_pd
, a
, status
);
1181 if ((hdr
->msg_type
== DHCPV6_MSG_RELEASE
|| hdr
->msg_type
== DHCPV6_MSG_DECLINE
|| notonlink
) &&
1182 response_len
+ 6 < buflen
) {
1184 buf
[1] = DHCPV6_OPT_STATUS
;
1188 buf
[5] = (notonlink
) ? DHCPV6_STATUS_NOTONLINK
: DHCPV6_STATUS_OK
;
1192 dhcpv6_write_statefile();
1195 return response_len
;