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 reconf_timer(struct uloop_timeout
*event
);
38 static struct uloop_timeout reconf_event
= {.cb
= reconf_timer
};
39 static uint32_t serial
= 0;
40 static uint8_t statemd5
[16];
43 int dhcpv6_ia_init(void)
45 uloop_timeout_set(&reconf_event
, 2000);
50 void free_dhcpv6_assignment(struct dhcpv6_assignment
*c
)
52 if (c
->managed_sock
.fd
.registered
) {
53 ustream_free(&c
->managed_sock
.stream
);
54 close(c
->managed_sock
.fd
.fd
);
66 int setup_dhcpv6_ia_interface(struct interface
*iface
, bool enable
)
68 if (!enable
&& iface
->ia_assignments
.next
) {
69 struct dhcpv6_assignment
*c
;
70 while (!list_empty(&iface
->ia_assignments
)) {
71 c
= list_first_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
72 free_dhcpv6_assignment(c
);
76 if (enable
&& iface
->dhcpv6
== RELAYD_SERVER
) {
77 if (!iface
->ia_assignments
.next
)
78 INIT_LIST_HEAD(&iface
->ia_assignments
);
80 if (list_empty(&iface
->ia_assignments
)) {
81 struct dhcpv6_assignment
*border
= calloc(1, sizeof(*border
));
83 syslog(LOG_ERR
, "Calloc failed for border on interface %s", iface
->ifname
);
88 list_add(&border
->head
, &iface
->ia_assignments
);
91 // Parse static entries
93 list_for_each_entry(lease
, &leases
, head
) {
95 struct dhcpv6_assignment
*a
= calloc(1, sizeof(*a
) + lease
->duid_len
);
97 syslog(LOG_ERR
, "Calloc failed for static lease assignment on interface %s",
102 a
->clid_len
= lease
->duid_len
;
105 a
->assigned
= lease
->hostid
;
107 uint32_t i4a
= ntohl(lease
->ipaddr
.s_addr
) & 0xff;
108 a
->assigned
= ((i4a
/ 100) << 8) | (((i4a
% 100) / 10) << 4) | (i4a
% 10);
110 odhcpd_urandom(a
->key
, sizeof(a
->key
));
111 memcpy(a
->clid_data
, lease
->duid
, a
->clid_len
);
112 memcpy(a
->mac
, lease
->mac
.ether_addr_octet
, sizeof(a
->mac
));
114 // Assign to all interfaces
115 struct dhcpv6_assignment
*c
;
116 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
117 if (c
->length
!= 128 || c
->assigned
> a
->assigned
) {
118 list_add_tail(&a
->head
, &c
->head
);
120 } else if (c
->assigned
== a
->assigned
) {
121 // Already an assignment with that number
127 if (lease
->hostname
[0]) {
129 a
->hostname
= strdup(lease
->hostname
);
141 static int send_reconf(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
144 struct dhcpv6_client_header hdr
;
148 uint16_t hardware_type
;
153 struct dhcpv6_auth_reconfigure auth
;
156 uint8_t clid_data
[128];
157 } __attribute__((packed
)) reconf_msg
= {
158 .hdr
= {DHCPV6_MSG_RECONFIGURE
, {0, 0, 0}},
159 .srvid_type
= htons(DHCPV6_OPT_SERVERID
),
160 .srvid_len
= htons(10),
161 .duid_type
= htons(3),
162 .hardware_type
= htons(1),
163 .msg_type
= htons(DHCPV6_OPT_RECONF_MSG
),
165 .msg_id
= DHCPV6_MSG_RENEW
,
166 .auth
= {htons(DHCPV6_OPT_AUTH
),
167 htons(sizeof(reconf_msg
.auth
) - 4), 3, 1, 0,
168 {htonl(time(NULL
)), htonl(++serial
)}, 2, {0}},
169 .clid_type
= htons(DHCPV6_OPT_CLIENTID
),
170 .clid_len
= htons(assign
->clid_len
),
174 odhcpd_get_mac(iface
, reconf_msg
.mac
);
175 memcpy(reconf_msg
.clid_data
, assign
->clid_data
, assign
->clid_len
);
176 struct iovec iov
= {&reconf_msg
, sizeof(reconf_msg
) - 128 + assign
->clid_len
};
179 uint8_t secretbytes
[64];
180 memset(secretbytes
, 0, sizeof(secretbytes
));
181 memcpy(secretbytes
, assign
->key
, sizeof(assign
->key
));
183 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
184 secretbytes
[i
] ^= 0x36;
187 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
188 md5_hash(iov
.iov_base
, iov
.iov_len
, &md5
);
189 md5_end(reconf_msg
.auth
.key
, &md5
);
191 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
192 secretbytes
[i
] ^= 0x36;
193 secretbytes
[i
] ^= 0x5c;
197 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
198 md5_hash(reconf_msg
.auth
.key
, 16, &md5
);
199 md5_end(reconf_msg
.auth
.key
, &md5
);
201 return odhcpd_send(iface
->dhcpv6_event
.uloop
.fd
, &assign
->peer
, &iov
, 1, iface
);
205 void dhcpv6_write_statefile(void)
210 if (config
.dhcp_statefile
) {
211 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
212 int fd
= open(config
.dhcp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
216 lockf(fd
, F_LOCK
, 0);
217 if (ftruncate(fd
, 0) < 0) {}
219 FILE *fp
= fdopen(fd
, "w");
225 struct interface
*iface
;
226 list_for_each_entry(iface
, &interfaces
, head
) {
227 if (iface
->dhcpv6
!= RELAYD_SERVER
&& iface
->dhcpv4
!= RELAYD_SERVER
)
230 if (iface
->dhcpv6
== RELAYD_SERVER
&& iface
->ia_assignments
.next
) {
231 struct dhcpv6_assignment
*c
;
232 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
233 if (c
->clid_len
== 0 || c
->managed_size
< 0)
236 char ipbuf
[INET6_ADDRSTRLEN
];
239 odhcpd_hexlify(duidbuf
, c
->clid_data
, c
->clid_len
);
241 // iface DUID iaid hostname lifetime assigned length [addrs...]
242 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s %x %s %u %x %u ",
243 iface
->ifname
, duidbuf
, ntohl(c
->iaid
),
244 (c
->hostname
? c
->hostname
: "-"),
245 (unsigned)(c
->valid_until
> now
?
246 (c
->valid_until
- now
+ wall_time
) : 0),
247 c
->assigned
, (unsigned)c
->length
);
249 struct in6_addr addr
;
250 struct odhcpd_ipaddr
*addrs
= (c
->managed
) ? c
->managed
: iface
->ia_addr
;
251 size_t addrlen
= (c
->managed
) ? (size_t)c
->managed_size
: iface
->ia_addr_len
;
254 for (size_t i
= 0; i
< addrlen
; ++i
)
255 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
256 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
257 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
260 for (size_t i
= 0; i
< addrlen
; ++i
) {
261 if (addrs
[i
].prefix
> 96 || c
->valid_until
<= now
||
262 (iface
->managed
< RELAYD_MANAGED_NO_AFLAG
&& i
!= m
&&
263 addrs
[i
].prefix
== 64))
266 addr
= addrs
[i
].addr
;
267 if (c
->length
== 128)
268 addr
.s6_addr32
[3] = htonl(c
->assigned
);
270 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
272 inet_ntop(AF_INET6
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
274 if (c
->length
== 128 && c
->hostname
) {
278 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
279 iface
->search
, b
, sizeof(b
)) > 0)
280 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
282 fprintf(fp
, "\t%s\n", c
->hostname
);
283 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
284 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
287 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/%d ", ipbuf
,
288 (c
->managed_size
) ? addrs
[i
].prefix
: c
->length
);
290 leasebuf
[l
- 1] = '\n';
291 fwrite(leasebuf
, 1, l
, fp
);
295 if (iface
->dhcpv4
== RELAYD_SERVER
&& iface
->dhcpv4_assignments
.next
) {
296 struct dhcpv4_assignment
*c
;
297 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
298 char ipbuf
[INET6_ADDRSTRLEN
];
301 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
303 // iface DUID iaid hostname lifetime assigned length [addrs...]
304 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s ipv4 %s %u %x 32 ",
305 iface
->ifname
, duidbuf
,
306 (c
->hostname
? c
->hostname
: "-"),
307 (unsigned)(c
->valid_until
> now
?
308 (c
->valid_until
- now
+ wall_time
) : 0),
311 struct in_addr addr
= {htonl(c
->addr
)};
312 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
314 if (c
->hostname
[0]) {
318 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
319 iface
->search
, b
, sizeof(b
)) > 0)
320 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
322 fprintf(fp
, "\t%s\n", c
->hostname
);
323 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
324 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
327 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/32 ", ipbuf
);
328 leasebuf
[l
- 1] = '\n';
329 fwrite(leasebuf
, 1, l
, fp
);
338 md5_end(newmd5
, &md5
);
340 if (config
.dhcp_cb
&& memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
341 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
342 char *argv
[2] = {config
.dhcp_cb
, NULL
};
344 execv(argv
[0], argv
);
351 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
353 if (a
->length
> 64 || a
->managed_size
< 0)
356 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
357 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
359 for (size_t i
= 0; i
< addrlen
; ++i
) {
360 struct in6_addr prefix
= addrs
[i
].addr
;
361 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
362 odhcpd_setup_route(&prefix
, (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
363 iface
, &a
->peer
.sin6_addr
, 1024, add
);
368 // More data was received from TCP connection
369 static void managed_handle_pd_data(struct ustream
*s
, _unused
int bytes_new
)
371 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
372 time_t now
= odhcpd_time();
373 bool first
= c
->managed_size
< 0;
377 char *data
= ustream_get_read_buf(s
, &pending
);
378 char *end
= memmem(data
, pending
, "\n\n", 2);
387 if (c
->accept_reconf
)
391 for (char *line
= strtok_r(data
, "\n", &saveptr
); line
; line
= strtok_r(NULL
, "\n", &saveptr
)) {
392 c
->managed
= realloc(c
->managed
, (c
->managed_size
+ 1) * sizeof(*c
->managed
));
393 struct odhcpd_ipaddr
*n
= &c
->managed
[c
->managed_size
];
395 char *saveptr2
, *x
= strtok_r(line
, "/", &saveptr2
);
396 if (!x
|| inet_pton(AF_INET6
, x
, &n
->addr
) < 1)
399 x
= strtok_r(NULL
, ",", &saveptr2
);
400 if (sscanf(x
, "%hhu", &n
->prefix
) < 1)
403 x
= strtok_r(NULL
, ",", &saveptr2
);
404 if (sscanf(x
, "%u", &n
->preferred
) < 1)
407 x
= strtok_r(NULL
, ",", &saveptr2
);
408 if (sscanf(x
, "%u", &n
->valid
) < 1)
411 if (n
->preferred
> n
->valid
)
414 if (UINT32_MAX
- now
< n
->preferred
)
415 n
->preferred
= UINT32_MAX
;
419 if (UINT32_MAX
- now
< n
->valid
)
420 n
->valid
= UINT32_MAX
;
429 ustream_consume(s
, end
- data
);
432 if (first
&& c
->managed_size
== 0)
433 free_dhcpv6_assignment(c
);
435 c
->valid_until
= now
+ 150;
439 // TCP transmission has ended, either because of success or timeout or other error
440 static void managed_handle_pd_done(struct ustream
*s
)
442 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
443 c
->valid_until
= odhcpd_time() + 15;
445 if (c
->accept_reconf
)
451 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
453 struct dhcpv6_assignment
*c
;
455 if (iface
->dhcpv6_pd_manager
[0]) {
456 int fd
= usock(USOCK_UNIX
| USOCK_TCP
, iface
->dhcpv6_pd_manager
, NULL
);
459 odhcpd_hexlify(iaidbuf
, assign
->clid_data
, assign
->clid_len
);
461 assign
->managed_sock
.stream
.notify_read
= managed_handle_pd_data
;
462 assign
->managed_sock
.stream
.notify_state
= managed_handle_pd_done
;
463 ustream_fd_init(&assign
->managed_sock
, fd
);
464 ustream_printf(&assign
->managed_sock
.stream
, "%s,%x\n::/%d,0,0\n\n",
465 iaidbuf
, assign
->iaid
, assign
->length
);
466 ustream_write_pending(&assign
->managed_sock
.stream
);
467 assign
->managed_size
= -1;
468 assign
->valid_until
= odhcpd_time() + 15;
469 list_add(&assign
->head
, &iface
->ia_assignments
);
471 // Wait initial period of up to 250ms for immediate assignment
472 struct pollfd pfd
= { .fd
= fd
, .events
= POLLIN
};
474 managed_handle_pd_data(&assign
->managed_sock
.stream
, 0);
476 if (fcntl(fd
, F_GETFL
) >= 0 && assign
->managed_size
> 0)
481 } else if (iface
->ia_addr_len
< 1) {
485 // Try honoring the hint first
486 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
487 if (assign
->assigned
) {
488 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
489 if (c
->length
== 128 || c
->length
== 0)
492 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
493 list_add_tail(&assign
->head
, &c
->head
);
494 apply_lease(iface
, assign
, true);
498 if (c
->assigned
!= 0)
499 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
503 // Fallback to a variable assignment
505 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
506 if (c
->length
== 128 || c
->length
== 0)
509 current
= (current
+ asize
) & (~asize
);
510 if (current
+ asize
< c
->assigned
) {
511 assign
->assigned
= current
;
512 list_add_tail(&assign
->head
, &c
->head
);
513 apply_lease(iface
, assign
, true);
517 if (c
->assigned
!= 0)
518 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
525 static bool assign_na(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
527 // Seed RNG with checksum of DUID
529 for (size_t i
= 0; i
< assign
->clid_len
; ++i
)
530 seed
+= assign
->clid_data
[i
];
533 // Try to assign up to 100x
534 for (size_t i
= 0; i
< 100; ++i
) {
536 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
538 struct dhcpv6_assignment
*c
;
539 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
543 if (c
->assigned
> try || c
->length
!= 128) {
544 assign
->assigned
= try;
545 list_add_tail(&assign
->head
, &c
->head
);
547 } else if (c
->assigned
== try) {
556 void dhcpv6_ia_preupdate(struct interface
*iface
)
558 if (iface
->dhcpv6
!= RELAYD_SERVER
)
561 struct dhcpv6_assignment
*c
, *border
= list_last_entry(
562 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
563 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
564 if (c
!= border
&& !iface
->managed
)
565 apply_lease(iface
, c
, false);
568 void dhcpv6_ia_postupdate(struct interface
*iface
, time_t now
)
570 if (iface
->dhcpv6
!= RELAYD_SERVER
)
574 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
575 if (iface
->ia_addr
[i
].preferred
> (uint32_t)now
&&
576 iface
->ia_addr
[i
].prefix
< 64 &&
577 iface
->ia_addr
[i
].prefix
> minprefix
)
578 minprefix
= iface
->ia_addr
[i
].prefix
;
581 struct dhcpv6_assignment
*border
= list_last_entry(
582 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
583 if (minprefix
> 32 && minprefix
<= 64)
584 border
->assigned
= 1U << (64 - minprefix
);
586 border
->assigned
= 0;
588 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
589 struct dhcpv6_assignment
*c
, *d
;
590 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
591 if (c
->clid_len
== 0 || c
->valid_until
< now
|| c
->managed_size
)
594 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
595 list_move(&c
->head
, &reassign
);
596 else if (c
!= border
)
597 apply_lease(iface
, c
, true);
599 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
601 c
->reconf_sent
= now
;
602 send_reconf(iface
, c
);
604 // Leave all other assignments of that client alone
605 struct dhcpv6_assignment
*a
;
606 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
607 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
608 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
609 c
->reconf_cnt
= INT_MAX
;
613 while (!list_empty(&reassign
)) {
614 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
616 if (!assign_pd(iface
, c
)) {
618 list_add(&c
->head
, &iface
->ia_assignments
);
622 dhcpv6_write_statefile();
626 static void reconf_timer(struct uloop_timeout
*event
)
628 time_t now
= odhcpd_time();
629 struct interface
*iface
;
630 list_for_each_entry(iface
, &interfaces
, head
) {
631 if (iface
->dhcpv6
!= RELAYD_SERVER
|| iface
->ia_assignments
.next
== NULL
)
634 struct dhcpv6_assignment
*a
, *n
;
635 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
636 if (a
->valid_until
< now
) {
637 if ((a
->length
< 128 && a
->clid_len
> 0) ||
638 (a
->length
== 128 && a
->clid_len
== 0)) {
640 free_dhcpv6_assignment(a
);
642 } else if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< 8 &&
643 now
> a
->reconf_sent
+ (1 << a
->reconf_cnt
)) {
645 a
->reconf_sent
= now
;
646 send_reconf(iface
, a
);
650 uloop_timeout_set(event
, 2000);
654 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
655 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
656 struct interface
*iface
, bool request
)
658 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
661 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
662 size_t datalen
= sizeof(out
);
663 time_t now
= odhcpd_time();
666 struct __attribute__((packed
)) {
670 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
673 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
674 datalen
+= sizeof(stat
);
677 uint32_t leasetime
= iface
->dhcpv4_leasetime
;
680 else if (leasetime
< 60)
683 uint32_t pref
= leasetime
;
684 uint32_t valid
= leasetime
;
686 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
687 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
690 for (size_t i
= 0; i
< addrlen
; ++i
)
691 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
692 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
693 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
696 for (size_t i
= 0; i
< addrlen
; ++i
) {
697 uint32_t prefix_pref
= addrs
[i
].preferred
;
698 uint32_t prefix_valid
= addrs
[i
].valid
;
700 if (addrs
[i
].prefix
> 96 ||
701 addrs
[i
].preferred
<= (uint32_t)now
)
704 if (prefix_pref
!= UINT32_MAX
)
707 if (prefix_valid
!= UINT32_MAX
)
710 if (a
->length
< 128) {
711 struct dhcpv6_ia_prefix p
= {
712 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
713 .len
= htons(sizeof(p
) - 4),
714 .preferred
= htonl(prefix_pref
),
715 .valid
= htonl(prefix_valid
),
716 .prefix
= (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
717 .addr
= addrs
[i
].addr
719 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
721 size_t entrlen
= sizeof(p
) - 4;
723 if (datalen
+ entrlen
+ 4 > buflen
||
724 (a
->assigned
== 0 && a
->managed_size
== 0) ||
725 (!a
->managed_size
&& a
->length
<= addrs
[i
].prefix
))
728 memcpy(buf
+ datalen
, &p
, sizeof(p
));
729 datalen
+= entrlen
+ 4;
731 struct dhcpv6_ia_addr n
= {
732 .type
= htons(DHCPV6_OPT_IA_ADDR
),
733 .len
= htons(sizeof(n
) - 4),
734 .addr
= addrs
[i
].addr
,
735 .preferred
= htonl(prefix_pref
),
736 .valid
= htonl(prefix_valid
)
738 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
739 size_t entrlen
= sizeof(n
) - 4;
741 if (iface
->managed
< RELAYD_MANAGED_NO_AFLAG
&& i
!= m
&&
742 addrs
[i
].prefix
== 64)
745 if (datalen
+ entrlen
+ 4 > buflen
|| a
->assigned
== 0)
748 memcpy(buf
+ datalen
, &n
, sizeof(n
));
749 datalen
+= entrlen
+ 4;
752 // Calculate T1 / T2 based on non-deprecated addresses
753 if (prefix_pref
> 0) {
754 if (prefix_pref
< pref
)
757 if (prefix_valid
< valid
)
758 valid
= prefix_valid
;
762 a
->valid_until
= valid
+ now
;
763 out
.t1
= htonl(pref
* 5 / 10);
764 out
.t2
= htonl(pref
* 8 / 10);
774 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
775 uint16_t otype
, olen
;
776 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
777 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
778 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
779 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
780 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
785 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
786 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
788 for (size_t i
= 0; i
< addrlen
; ++i
) {
789 if (addrs
[i
].prefix
> 96 ||
790 addrs
[i
].preferred
<= (uint32_t)now
)
793 struct in6_addr addr
= addrs
[i
].addr
;
794 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
795 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
797 if (!memcmp(&p
->addr
, &addr
, sizeof(addr
)) &&
798 p
->prefix
== ((a
->managed
) ? addrs
[i
].prefix
: a
->length
))
801 addr
.s6_addr32
[3] = htonl(a
->assigned
);
803 if (!memcmp(&n
->addr
, &addr
, sizeof(addr
)))
810 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
811 struct dhcpv6_ia_prefix inv
= {
812 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
813 .len
= htons(sizeof(inv
) - 4),
820 if (datalen
+ sizeof(inv
) > buflen
)
823 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
824 datalen
+= sizeof(inv
);
826 struct dhcpv6_ia_addr inv
= {
827 .type
= htons(DHCPV6_OPT_IA_ADDR
),
828 .len
= htons(sizeof(inv
) - 4),
834 if (datalen
+ sizeof(inv
) > buflen
)
837 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
838 datalen
+= sizeof(inv
);
845 out
.len
= htons(datalen
- 4);
846 memcpy(buf
, &out
, sizeof(out
));
851 static void dhcpv6_log(uint8_t msgtype
, struct interface
*iface
, time_t now
,
852 const char *duidbuf
, bool is_pd
, struct dhcpv6_assignment
*a
, int code
)
854 const char *type
= "UNKNOWN";
855 const char *status
= "UNKNOWN";
857 if (msgtype
== DHCPV6_MSG_RENEW
)
861 case DHCPV6_MSG_SOLICIT
:
864 case DHCPV6_MSG_REQUEST
:
867 case DHCPV6_MSG_CONFIRM
:
870 case DHCPV6_MSG_RENEW
:
873 case DHCPV6_MSG_REBIND
:
876 case DHCPV6_MSG_RELEASE
:
879 case DHCPV6_MSG_DECLINE
:
885 case DHCPV6_STATUS_OK
:
888 case DHCPV6_STATUS_NOADDRSAVAIL
:
889 status
= "no addresses available";
891 case DHCPV6_STATUS_NOBINDING
:
892 status
= "no binding";
894 case DHCPV6_STATUS_NOTONLINK
:
895 status
= "not on-link";
897 case DHCPV6_STATUS_NOPREFIXAVAIL
:
898 status
= "no prefix available";
902 char leasebuf
[256] = "";
905 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
906 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
908 char addrbuf
[INET6_ADDRSTRLEN
];
910 for (size_t i
= 0; i
< addrlen
; ++i
) {
911 if (addrs
[i
].prefix
> 96 || addrs
[i
].preferred
<= (uint32_t)now
)
914 struct in6_addr addr
= addrs
[i
].addr
;
915 int prefix
= a
->managed
? addrs
[i
].prefix
: a
->length
;
917 addr
.s6_addr32
[3] = htonl(a
->assigned
);
919 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
921 inet_ntop(AF_INET6
, &addr
, addrbuf
, sizeof(addrbuf
));
922 lbsize
+= snprintf(leasebuf
+ lbsize
, sizeof(leasebuf
) - lbsize
, "%s/%d ", addrbuf
, prefix
);
926 syslog(LOG_WARNING
, "DHCPV6 %s %s from %s on %s: %s %s", type
, (is_pd
) ? "IA_PD" : "IA_NA",
927 duidbuf
, iface
->ifname
, status
, leasebuf
);
932 ssize_t
dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
933 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
935 time_t now
= odhcpd_time();
936 size_t response_len
= 0;
937 const struct dhcpv6_client_header
*hdr
= data
;
938 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
939 uint16_t otype
, olen
;
941 // Find and parse client-id and hostname
942 bool accept_reconf
= false;
943 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
945 size_t hostname_len
= 0;
946 bool notonlink
= false;
949 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
950 if (otype
== DHCPV6_OPT_CLIENTID
) {
954 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
955 memcpy(mac
, &odata
[8], sizeof(mac
));
956 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
957 memcpy(mac
, &odata
[4], sizeof(mac
));
960 odhcpd_hexlify(duidbuf
, odata
, olen
);
961 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
962 uint8_t fqdn_buf
[256];
963 memcpy(fqdn_buf
, odata
, olen
);
964 fqdn_buf
[olen
++] = 0;
966 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
967 hostname_len
= strcspn(hostname
, ".");
968 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
969 accept_reconf
= true;
973 if (!clid_data
|| !clid_len
|| clid_len
> 130)
976 struct dhcpv6_assignment
*first
= NULL
;
977 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
978 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
979 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
980 bool ia_addr_present
= false;
981 if (!is_pd
&& !is_na
)
984 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
985 size_t ia_response_len
= 0;
986 uint8_t reqlen
= (is_pd
) ? 62 : 128;
987 uint32_t reqhint
= 0;
989 // Parse request hint for IA-PD
992 uint16_t stype
, slen
;
993 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
994 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
997 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
1000 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
1001 if (reqlen
> 32 && reqlen
<= 64)
1002 reqhint
&= (1U << (64 - reqlen
)) - 1;
1010 uint16_t stype
, slen
;
1011 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1012 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
1015 ia_addr_present
= true;
1020 struct dhcpv6_assignment
*c
, *a
= NULL
;
1021 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
1022 if (((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) ||
1023 (c
->clid_len
>= clid_len
&& !c
->clid_data
[0] && !c
->clid_data
[1]
1024 && !memcmp(c
->mac
, mac
, sizeof(mac
)))) &&
1025 (c
->iaid
== ia
->iaid
|| c
->valid_until
< now
) &&
1026 ((is_pd
&& c
->length
<= 64) || (is_na
&& c
->length
== 128))) {
1030 apply_lease(iface
, a
, false);
1031 memcpy(a
->clid_data
, clid_data
, clid_len
);
1032 a
->clid_len
= clid_len
;
1041 // Generic message handling
1042 uint16_t status
= DHCPV6_STATUS_OK
;
1043 if (a
&& a
->managed_size
< 0) {
1045 } else if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
|| hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1046 bool assigned
= !!a
;
1048 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
1049 a
= calloc(1, sizeof(*a
) + clid_len
);
1051 a
->clid_len
= clid_len
;
1055 a
->assigned
= reqhint
;
1058 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
1060 odhcpd_urandom(a
->key
, sizeof(a
->key
));
1061 memcpy(a
->clid_data
, clid_data
, clid_len
);
1064 while (!(assigned
= assign_pd(iface
, a
)) &&
1065 !a
->managed_size
&& ++a
->length
<= 64);
1067 assigned
= assign_na(iface
, a
);
1069 if (a
->managed_size
&& !assigned
)
1074 if (!assigned
|| iface
->ia_addr_len
== 0) { // Set error status
1075 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
1076 } else if (assigned
&& !first
) { //
1077 size_t handshake_len
= 4;
1079 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
1083 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1084 struct dhcpv6_auth_reconfigure auth
= {
1085 htons(DHCPV6_OPT_AUTH
),
1086 htons(sizeof(auth
) - 4),
1088 {htonl(time(NULL
)), htonl(++serial
)},
1092 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
1093 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
1094 handshake_len
+= sizeof(auth
);
1097 buf
+= handshake_len
;
1098 buflen
-= handshake_len
;
1099 response_len
+= handshake_len
;
1104 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1106 // Was only a solicitation: mark binding for removal
1107 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
1109 } else if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1110 if (hostname_len
> 0) {
1111 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
1113 memcpy(a
->hostname
, hostname
, hostname_len
);
1114 a
->hostname
[hostname_len
] = 0;
1117 a
->accept_reconf
= accept_reconf
;
1118 apply_lease(iface
, a
, true);
1119 } else if (!assigned
&& a
&& a
->managed_size
== 0) { // Cleanup failed assignment
1120 free_dhcpv6_assignment(a
);
1122 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1123 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1124 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1125 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1126 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1127 status
= DHCPV6_STATUS_NOBINDING
;
1128 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1129 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1130 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1131 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1133 apply_lease(iface
, a
, true);
1134 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1136 apply_lease(iface
, a
, false);
1137 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128) {
1139 a
->valid_until
= now
+ 3600; // Block address for 1h
1141 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
&& ia_addr_present
) {
1142 // Send NOTONLINK for CONFIRM with addr present so that clients restart connection
1143 status
= DHCPV6_STATUS_NOTONLINK
;
1144 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1148 buf
+= ia_response_len
;
1149 buflen
-= ia_response_len
;
1150 response_len
+= ia_response_len
;
1151 dhcpv6_log(hdr
->msg_type
, iface
, now
, duidbuf
, is_pd
, a
, status
);
1154 if ((hdr
->msg_type
== DHCPV6_MSG_RELEASE
|| hdr
->msg_type
== DHCPV6_MSG_DECLINE
|| notonlink
) &&
1155 response_len
+ 6 < buflen
) {
1157 buf
[1] = DHCPV6_OPT_STATUS
;
1161 buf
[5] = (notonlink
) ? DHCPV6_STATUS_NOTONLINK
: DHCPV6_STATUS_OK
;
1165 dhcpv6_write_statefile();
1168 return response_len
;