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"
28 #include <arpa/inet.h>
29 #include <sys/timerfd.h>
32 static void update(struct interface
*iface
);
33 static void reconf_timer(struct uloop_timeout
*event
);
34 static struct uloop_timeout reconf_event
= {.cb
= reconf_timer
};
35 static uint32_t serial
= 0;
36 static uint8_t statemd5
[16];
39 int dhcpv6_ia_init(void)
41 uloop_timeout_set(&reconf_event
, 2000);
46 int setup_dhcpv6_ia_interface(struct interface
*iface
, bool enable
)
48 if (!enable
&& iface
->ia_assignments
.next
) {
49 struct dhcpv6_assignment
*c
;
50 while (!list_empty(&iface
->ia_assignments
)) {
51 c
= list_first_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
59 if (iface
->dhcpv6
== RELAYD_SERVER
) {
60 if (!iface
->ia_assignments
.next
)
61 INIT_LIST_HEAD(&iface
->ia_assignments
);
63 if (list_empty(&iface
->ia_assignments
)) {
64 struct dhcpv6_assignment
*border
= calloc(1, sizeof(*border
));
66 syslog(LOG_ERR
, "Calloc failed for border on interface %s", iface
->ifname
);
71 list_add(&border
->head
, &iface
->ia_assignments
);
76 // Parse static entries
78 list_for_each_entry(lease
, &leases
, head
) {
80 struct dhcpv6_assignment
*a
= calloc(1, sizeof(*a
) + lease
->duid_len
);
82 syslog(LOG_ERR
, "Calloc failed for static lease assignment on interface %s",
87 a
->clid_len
= lease
->duid_len
;
90 a
->assigned
= lease
->hostid
;
92 uint32_t i4a
= ntohl(lease
->ipaddr
.s_addr
) & 0xff;
93 a
->assigned
= ((i4a
/ 100) << 8) | (((i4a
% 100) / 10) << 4) | (i4a
% 10);
95 odhcpd_urandom(a
->key
, sizeof(a
->key
));
96 memcpy(a
->clid_data
, lease
->duid
, a
->clid_len
);
97 memcpy(a
->mac
, lease
->mac
.ether_addr_octet
, sizeof(a
->mac
));
99 // Assign to all interfaces
100 struct dhcpv6_assignment
*c
;
101 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
102 if (c
->length
!= 128 || c
->assigned
> a
->assigned
) {
103 list_add_tail(&a
->head
, &c
->head
);
105 } else if (c
->assigned
== a
->assigned
) {
106 // Already an assignment with that number
112 if (lease
->hostname
[0]) {
114 a
->hostname
= strdup(lease
->hostname
);
127 static int send_reconf(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
130 struct dhcpv6_client_header hdr
;
134 uint16_t hardware_type
;
139 struct dhcpv6_auth_reconfigure auth
;
142 uint8_t clid_data
[128];
143 } __attribute__((packed
)) reconf_msg
= {
144 .hdr
= {DHCPV6_MSG_RECONFIGURE
, {0, 0, 0}},
145 .srvid_type
= htons(DHCPV6_OPT_SERVERID
),
146 .srvid_len
= htons(10),
147 .duid_type
= htons(3),
148 .hardware_type
= htons(1),
149 .msg_type
= htons(DHCPV6_OPT_RECONF_MSG
),
151 .msg_id
= DHCPV6_MSG_RENEW
,
152 .auth
= {htons(DHCPV6_OPT_AUTH
),
153 htons(sizeof(reconf_msg
.auth
) - 4), 3, 1, 0,
154 {htonl(time(NULL
)), htonl(++serial
)}, 2, {0}},
155 .clid_type
= htons(DHCPV6_OPT_CLIENTID
),
156 .clid_len
= htons(assign
->clid_len
),
160 odhcpd_get_mac(iface
, reconf_msg
.mac
);
161 memcpy(reconf_msg
.clid_data
, assign
->clid_data
, assign
->clid_len
);
162 struct iovec iov
= {&reconf_msg
, sizeof(reconf_msg
) - 128 + assign
->clid_len
};
165 uint8_t secretbytes
[16];
166 memcpy(secretbytes
, assign
->key
, sizeof(secretbytes
));
168 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
169 secretbytes
[i
] ^= 0x36;
172 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
173 md5_hash(iov
.iov_base
, iov
.iov_len
, &md5
);
174 md5_end(reconf_msg
.auth
.key
, &md5
);
176 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
177 secretbytes
[i
] ^= 0x36;
178 secretbytes
[i
] ^= 0x5c;
182 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
183 md5_hash(reconf_msg
.auth
.key
, 16, &md5
);
184 md5_end(reconf_msg
.auth
.key
, &md5
);
186 return odhcpd_send(iface
->dhcpv6_event
.uloop
.fd
, &assign
->peer
, &iov
, 1, iface
);
190 void dhcpv6_write_statefile(void)
195 if (config
.dhcp_statefile
) {
196 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
197 int fd
= open(config
.dhcp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
201 lockf(fd
, F_LOCK
, 0);
204 FILE *fp
= fdopen(fd
, "w");
210 struct interface
*iface
;
211 list_for_each_entry(iface
, &interfaces
, head
) {
212 if (iface
->dhcpv6
!= RELAYD_SERVER
&& iface
->dhcpv4
!= RELAYD_SERVER
)
215 if (iface
->dhcpv6
== RELAYD_SERVER
&& iface
->ia_assignments
.next
) {
216 struct dhcpv6_assignment
*c
;
217 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
218 if (c
->clid_len
== 0)
221 char ipbuf
[INET6_ADDRSTRLEN
];
224 odhcpd_hexlify(duidbuf
, c
->clid_data
, c
->clid_len
);
226 // iface DUID iaid hostname lifetime assigned length [addrs...]
227 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s %x %s %u %x %u ",
228 iface
->ifname
, duidbuf
, ntohl(c
->iaid
),
229 (c
->hostname
? c
->hostname
: "-"),
230 (unsigned)(c
->valid_until
> now
?
231 (c
->valid_until
- now
+ wall_time
) : 0),
232 c
->assigned
, (unsigned)c
->length
);
234 struct in6_addr addr
;
235 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
236 if (iface
->ia_addr
[i
].prefix
> 96)
239 addr
= iface
->ia_addr
[i
].addr
;
240 if (c
->length
== 128)
241 addr
.s6_addr32
[3] = htonl(c
->assigned
);
243 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
244 inet_ntop(AF_INET6
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
246 if (c
->length
== 128 && c
->hostname
&& i
== 0) {
250 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
251 iface
->search
, b
, sizeof(b
)) > 0)
252 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
254 fprintf(fp
, "\t%s\n", c
->hostname
);
255 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
256 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
259 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/%hhu ", ipbuf
, c
->length
);
261 leasebuf
[l
- 1] = '\n';
262 fwrite(leasebuf
, 1, l
, fp
);
266 if (iface
->dhcpv4
== RELAYD_SERVER
&& iface
->dhcpv4_assignments
.next
) {
267 struct dhcpv4_assignment
*c
;
268 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
269 char ipbuf
[INET6_ADDRSTRLEN
];
272 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
274 // iface DUID iaid hostname lifetime assigned length [addrs...]
275 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s ipv4 %s %u %x 32 ",
276 iface
->ifname
, duidbuf
,
277 (c
->hostname
? c
->hostname
: "-"),
278 (unsigned)(c
->valid_until
> now
?
279 (c
->valid_until
- now
+ wall_time
) : 0),
282 struct in_addr addr
= {htonl(c
->addr
)};
283 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
285 if (c
->hostname
[0]) {
289 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
290 iface
->search
, b
, sizeof(b
)) > 0)
291 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
293 fprintf(fp
, "\t%s\n", c
->hostname
);
294 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
295 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
298 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/32 ", ipbuf
);
299 leasebuf
[l
- 1] = '\n';
300 fwrite(leasebuf
, 1, l
, fp
);
309 md5_end(newmd5
, &md5
);
311 if (config
.dhcp_cb
&& memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
312 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
313 char *argv
[2] = {config
.dhcp_cb
, NULL
};
315 execv(argv
[0], argv
);
322 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
327 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
328 struct in6_addr prefix
= iface
->ia_addr
[i
].addr
;
329 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
330 odhcpd_setup_route(&prefix
, a
->length
, iface
, &a
->peer
.sin6_addr
, add
);
335 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
337 struct dhcpv6_assignment
*c
;
338 if (iface
->ia_addr_len
< 1)
341 // Try honoring the hint first
342 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
343 if (assign
->assigned
) {
344 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
345 if (c
->length
== 128)
348 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
349 list_add_tail(&assign
->head
, &c
->head
);
350 apply_lease(iface
, assign
, true);
354 if (c
->assigned
!= 0)
355 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
359 // Fallback to a variable assignment
361 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
362 if (c
->length
== 128)
365 current
= (current
+ asize
) & (~asize
);
366 if (current
+ asize
< c
->assigned
) {
367 assign
->assigned
= current
;
368 list_add_tail(&assign
->head
, &c
->head
);
369 apply_lease(iface
, assign
, true);
373 if (c
->assigned
!= 0)
374 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
381 static bool assign_na(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
384 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
385 if (!iface
->ia_addr
[i
].has_class
) {
388 } else if (assign
->classes_cnt
) {
389 for (size_t j
= 0; j
< assign
->classes_cnt
; ++j
)
390 if (assign
->classes
[j
] == iface
->ia_addr
[i
].class)
392 } else if (assign
->all_class
) {
400 // Seed RNG with checksum of DUID
402 for (size_t i
= 0; i
< assign
->clid_len
; ++i
)
403 seed
+= assign
->clid_data
[i
];
406 // Try to assign up to 100x
407 for (size_t i
= 0; i
< 100; ++i
) {
409 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
411 struct dhcpv6_assignment
*c
;
412 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
413 if (c
->assigned
> try || c
->length
!= 128) {
414 assign
->assigned
= try;
415 list_add_tail(&assign
->head
, &c
->head
);
417 } else if (c
->assigned
== try) {
427 static int prefixcmp(const void *va
, const void *vb
)
429 const struct odhcpd_ipaddr
*a
= va
, *b
= vb
;
430 uint32_t a_pref
= ((a
->addr
.s6_addr
[0] & 0xfe) != 0xfc) ? a
->preferred
: 1;
431 uint32_t b_pref
= ((b
->addr
.s6_addr
[0] & 0xfe) != 0xfc) ? b
->preferred
: 1;
432 return (a_pref
< b_pref
) ? 1 : (a_pref
> b_pref
) ? -1 : 0;
436 static void update(struct interface
*iface
)
438 struct odhcpd_ipaddr addr
[8];
439 memset(addr
, 0, sizeof(addr
));
440 int len
= odhcpd_get_interface_addresses(iface
->ifindex
, addr
, 8);
445 qsort(addr
, len
, sizeof(*addr
), prefixcmp
);
447 time_t now
= odhcpd_time();
450 for (int i
= 0; i
< len
; ++i
) {
451 if (addr
[i
].prefix
> minprefix
)
452 minprefix
= addr
[i
].prefix
;
454 addr
[i
].addr
.s6_addr32
[3] = 0;
456 if (addr
[i
].preferred
< UINT32_MAX
- now
)
457 addr
[i
].preferred
+= now
;
459 if (addr
[i
].valid
< UINT32_MAX
- now
)
460 addr
[i
].valid
+= now
;
463 struct dhcpv6_assignment
*border
= list_last_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
464 border
->assigned
= 1 << (64 - minprefix
);
466 bool change
= len
!= (int)iface
->ia_addr_len
;
467 for (int i
= 0; !change
&& i
< len
; ++i
)
468 if (addr
[i
].addr
.s6_addr32
[0] != iface
->ia_addr
[i
].addr
.s6_addr32
[0] ||
469 addr
[i
].addr
.s6_addr32
[1] != iface
->ia_addr
[i
].addr
.s6_addr32
[1] ||
470 (addr
[i
].preferred
> 0) != (iface
->ia_addr
[i
].preferred
> 0) ||
471 (addr
[i
].valid
> (uint32_t)now
+ 7200) !=
472 (iface
->ia_addr
[i
].valid
> (uint32_t)now
+ 7200))
476 struct dhcpv6_assignment
*c
;
477 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
479 apply_lease(iface
, c
, false);
482 memcpy(iface
->ia_addr
, addr
, len
* sizeof(*addr
));
483 iface
->ia_addr_len
= len
;
485 if (change
) { // Addresses / prefixes have changed
486 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
487 struct dhcpv6_assignment
*c
, *d
;
488 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
489 if (c
->clid_len
== 0 || c
->valid_until
< now
)
492 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
493 list_move(&c
->head
, &reassign
);
494 else if (c
!= border
)
495 apply_lease(iface
, c
, true);
497 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
499 c
->reconf_sent
= now
;
500 send_reconf(iface
, c
);
502 // Leave all other assignments of that client alone
503 struct dhcpv6_assignment
*a
;
504 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
505 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
506 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
507 c
->reconf_cnt
= INT_MAX
;
511 while (!list_empty(&reassign
)) {
512 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
514 if (!assign_pd(iface
, c
)) {
516 list_add(&c
->head
, &iface
->ia_assignments
);
520 dhcpv6_write_statefile();
525 static void reconf_timer(struct uloop_timeout
*event
)
527 time_t now
= odhcpd_time();
528 struct interface
*iface
;
529 list_for_each_entry(iface
, &interfaces
, head
) {
530 if (iface
->dhcpv6
!= RELAYD_SERVER
|| iface
->ia_assignments
.next
== NULL
)
533 struct dhcpv6_assignment
*a
, *n
;
534 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
535 if (a
->valid_until
< now
) {
536 if ((a
->length
< 128 && a
->clid_len
> 0) ||
537 (a
->length
== 128 && a
->clid_len
== 0)) {
543 } else if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< 8 &&
544 now
> a
->reconf_sent
+ (1 << a
->reconf_cnt
)) {
546 a
->reconf_sent
= now
;
547 send_reconf(iface
, a
);
551 if (iface
->ia_reconf
) {
553 iface
->ia_reconf
= false;
557 uloop_timeout_set(event
, 2000);
561 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
562 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
563 struct interface
*iface
, bool request
)
565 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
568 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
569 size_t datalen
= sizeof(out
);
570 time_t now
= odhcpd_time();
573 struct __attribute__((packed
)) {
577 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
580 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
581 datalen
+= sizeof(stat
);
584 uint32_t pref
= 3600;
585 uint32_t valid
= 3600;
587 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
589 if (iface
->ia_addr
[i
].has_class
) {
591 if (a
->classes_cnt
) {
592 for (size_t j
= 0; j
< a
->classes_cnt
; ++j
)
593 if (a
->classes
[j
] == iface
->ia_addr
[i
].class)
595 } else if (a
->all_class
) {
603 uint32_t prefix_pref
= iface
->ia_addr
[i
].preferred
- now
;
604 uint32_t prefix_valid
= iface
->ia_addr
[i
].valid
- now
;
606 if (iface
->ia_addr
[i
].prefix
> 96 ||
607 iface
->ia_addr
[i
].preferred
<= (uint32_t)now
)
610 if (prefix_pref
> 86400)
613 if (prefix_valid
> 86400)
614 prefix_valid
= 86400;
616 #ifdef DHCPV6_OPT_PREFIX_CLASS
621 } pclass
= {htons(DHCPV6_OPT_PREFIX_CLASS
),
622 htons(2), htons(iface
->ia_addr
[i
].class)};
625 if (a
->length
< 128) {
626 struct dhcpv6_ia_prefix p
= {
627 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
628 .len
= htons(sizeof(p
) - 4),
629 .preferred
= htonl(prefix_pref
),
630 .valid
= htonl(prefix_valid
),
632 .addr
= iface
->ia_addr
[i
].addr
634 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
635 size_t entrlen
= sizeof(p
) - 4;
637 #ifdef DHCPV6_OPT_PREFIX_CLASS
638 if (iface
->ia_addr
[i
].has_class
) {
639 entrlen
+= sizeof(pclass
);
640 p
.len
= htons(entrlen
);
644 if (datalen
+ entrlen
+ 4 > buflen
|| a
->assigned
== 0)
647 memcpy(buf
+ datalen
, &p
, sizeof(p
));
648 #ifdef DHCPV6_OPT_PREFIX_CLASS
649 memcpy(buf
+ datalen
+ sizeof(p
), &pclass
, sizeof(pclass
));
651 datalen
+= entrlen
+ 4;
653 struct dhcpv6_ia_addr n
= {
654 .type
= htons(DHCPV6_OPT_IA_ADDR
),
655 .len
= htons(sizeof(n
) - 4),
656 .addr
= iface
->ia_addr
[i
].addr
,
657 .preferred
= htonl(prefix_pref
),
658 .valid
= htonl(prefix_valid
)
660 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
661 size_t entrlen
= sizeof(n
) - 4;
663 #ifdef DHCPV6_OPT_PREFIX_CLASS
664 if (iface
->ia_addr
[i
].has_class
) {
665 entrlen
+= sizeof(pclass
);
666 n
.len
= htons(entrlen
);
670 if (datalen
+ entrlen
+ 4 > buflen
|| a
->assigned
== 0)
673 memcpy(buf
+ datalen
, &n
, sizeof(n
));
674 #ifdef DHCPV6_OPT_PREFIX_CLASS
675 memcpy(buf
+ datalen
+ sizeof(n
), &pclass
, sizeof(pclass
));
677 datalen
+= entrlen
+ 4;
680 // Calculate T1 / T2 based on non-deprecated addresses
681 if (prefix_pref
> 0) {
682 if (prefix_pref
< pref
)
685 if (prefix_valid
< valid
)
686 valid
= prefix_valid
;
690 a
->valid_until
= valid
+ now
;
691 out
.t1
= htonl(pref
* 5 / 10);
692 out
.t2
= htonl(pref
* 8 / 10);
702 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
703 uint16_t otype
, olen
;
704 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
705 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
706 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
707 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
708 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
713 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
714 if (iface
->ia_addr
[i
].prefix
> 96 ||
715 iface
->ia_addr
[i
].preferred
<= (uint32_t)now
)
718 struct in6_addr addr
= iface
->ia_addr
[i
].addr
;
719 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
720 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
722 if (!memcmp(&p
->addr
, &addr
, sizeof(addr
)) &&
723 p
->prefix
== a
->length
)
726 addr
.s6_addr32
[3] = htonl(a
->assigned
);
728 if (!memcmp(&n
->addr
, &addr
, sizeof(addr
)))
735 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
736 struct dhcpv6_ia_prefix inv
= {
737 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
738 .len
= htons(sizeof(inv
) - 4),
745 if (datalen
+ sizeof(inv
) > buflen
)
748 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
749 datalen
+= sizeof(inv
);
751 struct dhcpv6_ia_addr inv
= {
752 .type
= htons(DHCPV6_OPT_IA_ADDR
),
753 .len
= htons(sizeof(inv
) - 4),
759 if (datalen
+ sizeof(inv
) > buflen
)
762 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
763 datalen
+= sizeof(inv
);
770 out
.len
= htons(datalen
- 4);
771 memcpy(buf
, &out
, sizeof(out
));
776 size_t dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
777 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
779 time_t now
= odhcpd_time();
780 size_t response_len
= 0;
781 const struct dhcpv6_client_header
*hdr
= data
;
782 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
783 uint16_t otype
, olen
;
785 // Find and parse client-id and hostname
786 bool accept_reconf
= false;
787 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
789 size_t hostname_len
= 0;
790 bool class_oro
= false;
791 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
792 if (otype
== DHCPV6_OPT_CLIENTID
) {
796 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
797 memcpy(mac
, &odata
[8], sizeof(mac
));
798 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
799 memcpy(mac
, &odata
[4], sizeof(mac
));
800 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
801 uint8_t fqdn_buf
[256];
802 memcpy(fqdn_buf
, odata
, olen
);
803 fqdn_buf
[olen
++] = 0;
805 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
806 hostname_len
= strcspn(hostname
, ".");
807 } else if (otype
== DHCPV6_OPT_ORO
) {
808 #ifdef DHCPV6_OPT_PREFIX_CLASS
809 for (size_t i
= 0; i
+ 1 < olen
; i
+= 2) {
810 if (odata
[i
] == (DHCPV6_OPT_PREFIX_CLASS
>> 8) &&
811 odata
[i
+ 1] == (DHCPV6_OPT_PREFIX_CLASS
& 0xff))
815 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
816 accept_reconf
= true;
820 if (!clid_data
|| !clid_len
|| clid_len
> 130)
824 bool update_state
= false;
826 struct dhcpv6_assignment
*first
= NULL
;
827 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
828 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
829 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
830 if (!is_pd
&& !is_na
)
833 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
834 size_t ia_response_len
= 0;
835 uint8_t reqlen
= (is_pd
) ? 62 : 128;
836 uint32_t reqhint
= 0;
838 const uint8_t classes_max
= 32;
839 uint8_t classes_cnt
= 0;
840 uint16_t classes
[classes_max
];
842 // Parse request hint for IA-PD
845 uint16_t stype
, slen
;
846 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
847 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
850 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
853 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
854 if (reqlen
> 32 && reqlen
<= 64)
855 reqhint
&= (1U << (64 - reqlen
)) - 1;
858 #ifdef DHCPV6_OPT_PREFIX_CLASS
860 uint16_t xtype
, xlen
;
861 dhcpv6_for_each_option(&p
[1], sdata
+ slen
, xtype
, xlen
, xdata
) {
862 if (xtype
!= DHCPV6_OPT_PREFIX_CLASS
|| xlen
!= 2)
865 if (classes_cnt
>= classes_max
)
868 classes
[classes_cnt
++] = (uint16_t)xdata
[0] << 8 | (uint16_t)xdata
[1];
877 uint16_t stype
, slen
;
878 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
879 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
882 #ifdef DHCPV6_OPT_PREFIX_CLASS
884 uint16_t xtype
, xlen
;
885 struct dhcpv6_ia_addr
*p
= (struct dhcpv6_ia_addr
*)&sdata
[-4];
886 dhcpv6_for_each_option(&p
[1], sdata
+ slen
, xtype
, xlen
, xdata
) {
887 if (xtype
!= DHCPV6_OPT_PREFIX_CLASS
|| xlen
!= 2)
890 if (classes_cnt
>= classes_max
)
893 classes
[classes_cnt
++] = (uint16_t)xdata
[0] << 8 | (uint16_t)xdata
[1];
900 struct dhcpv6_assignment
*c
, *a
= NULL
;
901 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
902 if (((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) ||
903 (c
->clid_len
>= clid_len
&& !c
->clid_data
[0] && !c
->clid_data
[1]
904 && !memcmp(c
->mac
, mac
, sizeof(mac
)))) &&
905 (c
->iaid
== ia
->iaid
|| c
->valid_until
< now
) &&
906 ((is_pd
&& c
->length
<= 64) || (is_na
&& c
->length
== 128))) {
910 apply_lease(iface
, a
, false);
911 memcpy(a
->clid_data
, clid_data
, clid_len
);
912 a
->clid_len
= clid_len
;
917 a
->all_class
= class_oro
;
918 a
->classes_cnt
= classes_cnt
;
919 a
->classes
= realloc(a
->classes
, classes_cnt
* sizeof(uint16_t));
921 memcpy(a
->classes
, classes
, classes_cnt
* sizeof(uint16_t));
926 // Generic message handling
927 uint16_t status
= DHCPV6_STATUS_OK
;
928 if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
|| hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
931 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
932 a
= calloc(1, sizeof(*a
) + clid_len
);
934 a
->clid_len
= clid_len
;
938 a
->assigned
= reqhint
;
939 a
->all_class
= class_oro
;
940 a
->classes_cnt
= classes_cnt
;
942 a
->classes
= malloc(classes_cnt
* sizeof(uint16_t));
944 memcpy(a
->classes
, classes
, classes_cnt
* sizeof(uint16_t));
948 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
950 odhcpd_urandom(a
->key
, sizeof(a
->key
));
951 memcpy(a
->clid_data
, clid_data
, clid_len
);
954 while (!(assigned
= assign_pd(iface
, a
)) && ++a
->length
<= 64);
956 assigned
= assign_na(iface
, a
);
960 if (!assigned
|| iface
->ia_addr_len
== 0) { // Set error status
961 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
962 } else if (assigned
&& !first
) { //
963 size_t handshake_len
= 4;
965 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
969 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
970 struct dhcpv6_auth_reconfigure auth
= {
971 htons(DHCPV6_OPT_AUTH
),
972 htons(sizeof(auth
) - 4),
974 {htonl(time(NULL
)), htonl(++serial
)},
978 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
979 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
980 handshake_len
+= sizeof(auth
);
983 buf
+= handshake_len
;
984 buflen
-= handshake_len
;
985 response_len
+= handshake_len
;
990 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
992 // Was only a solicitation: mark binding for removal
993 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
995 } else if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
996 if (hostname_len
> 0) {
997 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
999 memcpy(a
->hostname
, hostname
, hostname_len
);
1000 a
->hostname
[hostname_len
] = 0;
1003 a
->accept_reconf
= accept_reconf
;
1004 apply_lease(iface
, a
, true);
1005 update_state
= true;
1006 } else if (!assigned
&& a
) { // Cleanup failed assignment
1011 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1012 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1013 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1014 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1015 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1016 status
= DHCPV6_STATUS_NOBINDING
;
1017 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1018 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1019 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1020 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1022 apply_lease(iface
, a
, true);
1023 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1025 apply_lease(iface
, a
, false);
1026 update_state
= true;
1027 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128) {
1029 a
->valid_until
= now
+ 3600; // Block address for 1h
1030 update_state
= true;
1032 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
) {
1033 // Always send NOTONLINK for CONFIRM so that clients restart connection
1034 status
= DHCPV6_STATUS_NOTONLINK
;
1035 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1038 buf
+= ia_response_len
;
1039 buflen
-= ia_response_len
;
1040 response_len
+= ia_response_len
;
1043 if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
&& response_len
+ 6 < buflen
) {
1045 buf
[1] = DHCPV6_OPT_STATUS
;
1049 buf
[5] = DHCPV6_STATUS_OK
;
1054 dhcpv6_write_statefile();
1057 return response_len
;