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 int socket_fd
= -1;
36 static uint32_t serial
= 0;
39 int dhcpv6_ia_init(int dhcpv6_socket
)
41 socket_fd
= dhcpv6_socket
;
42 uloop_timeout_set(&reconf_event
, 2000);
47 int setup_dhcpv6_ia_interface(struct interface
*iface
, bool enable
)
49 if (!enable
&& iface
->ia_assignments
.next
) {
50 struct dhcpv6_assignment
*c
;
51 while (!list_empty(&iface
->ia_assignments
)) {
52 c
= list_first_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
60 if (iface
->dhcpv6
== RELAYD_SERVER
) {
61 if (!iface
->ia_assignments
.next
)
62 INIT_LIST_HEAD(&iface
->ia_assignments
);
64 if (list_empty(&iface
->ia_assignments
)) {
65 struct dhcpv6_assignment
*border
= calloc(1, sizeof(*border
));
67 syslog(LOG_ERR
, "Calloc failed for border on interface %s", iface
->ifname
);
72 list_add(&border
->head
, &iface
->ia_assignments
);
77 // Parse static entries
79 list_for_each_entry(lease
, &leases
, head
) {
81 struct dhcpv6_assignment
*a
= calloc(1, sizeof(*a
) + lease
->duid_len
);
83 syslog(LOG_ERR
, "Calloc failed for static lease assignment on interface %s",
88 a
->clid_len
= lease
->duid_len
;
91 a
->assigned
= lease
->hostid
;
93 uint32_t i4a
= ntohl(lease
->ipaddr
.s_addr
) & 0xff;
94 a
->assigned
= ((i4a
/ 100) << 8) | (((i4a
% 100) / 10) << 4) | (i4a
% 10);
96 odhcpd_urandom(a
->key
, sizeof(a
->key
));
97 memcpy(a
->clid_data
, lease
->duid
, a
->clid_len
);
98 memcpy(a
->mac
, lease
->mac
.ether_addr_octet
, sizeof(a
->mac
));
100 // Assign to all interfaces
101 struct dhcpv6_assignment
*c
;
102 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
103 if (c
->length
!= 128 || c
->assigned
> a
->assigned
) {
104 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(socket_fd
, &assign
->peer
, &iov
, 1, iface
);
190 void dhcpv6_write_statefile(void)
192 if (config
.dhcp_statefile
) {
193 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
194 int fd
= open(config
.dhcp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
198 lockf(fd
, F_LOCK
, 0);
201 FILE *fp
= fdopen(fd
, "w");
207 struct interface
*iface
;
208 list_for_each_entry(iface
, &interfaces
, head
) {
209 if (iface
->dhcpv6
!= RELAYD_SERVER
&& iface
->dhcpv4
!= RELAYD_SERVER
)
212 if (iface
->dhcpv6
== RELAYD_SERVER
) {
213 struct dhcpv6_assignment
*c
;
214 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
215 if (c
->clid_len
== 0)
218 char ipbuf
[INET6_ADDRSTRLEN
];
221 odhcpd_hexlify(duidbuf
, c
->clid_data
, c
->clid_len
);
223 // iface DUID iaid hostname lifetime assigned length [addrs...]
224 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s %x %s %u %x %u ",
225 iface
->ifname
, duidbuf
, ntohl(c
->iaid
),
226 (c
->hostname
? c
->hostname
: "-"),
227 (unsigned)(c
->valid_until
> now
?
228 (c
->valid_until
- now
+ wall_time
) : 0),
229 c
->assigned
, (unsigned)c
->length
);
231 struct in6_addr addr
;
232 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
233 if (iface
->ia_addr
[i
].prefix
> 64)
236 addr
= iface
->ia_addr
[i
].addr
;
237 if (c
->length
== 128)
238 addr
.s6_addr32
[3] = htonl(c
->assigned
);
240 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
241 inet_ntop(AF_INET6
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
243 if (c
->length
== 128 && c
->hostname
&& i
== 0)
244 fprintf(fp
, "%s\t%s\n", ipbuf
, c
->hostname
);
246 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/%hhu ", ipbuf
, c
->length
);
248 leasebuf
[l
- 1] = '\n';
249 fwrite(leasebuf
, 1, l
, fp
);
253 if (iface
->dhcpv4
== RELAYD_SERVER
) {
254 struct dhcpv4_assignment
*c
;
255 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
256 char ipbuf
[INET6_ADDRSTRLEN
];
259 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
261 // iface DUID iaid hostname lifetime assigned length [addrs...]
262 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s ipv4 %s %u %x 32 ",
263 iface
->ifname
, duidbuf
,
264 (c
->hostname
? c
->hostname
: "-"),
265 (unsigned)(c
->valid_until
> now
?
266 (c
->valid_until
- now
+ wall_time
) : 0),
269 struct in_addr addr
= {htonl(c
->addr
)};
270 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
273 fprintf(fp
, "%s\t%s\n", ipbuf
, c
->hostname
);
275 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/32 ", ipbuf
);
276 leasebuf
[l
- 1] = '\n';
277 fwrite(leasebuf
, 1, l
, fp
);
285 if (config
.dhcp_cb
) {
286 char *argv
[2] = {config
.dhcp_cb
, NULL
};
288 execv(argv
[0], argv
);
295 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
300 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
301 struct in6_addr prefix
= iface
->ia_addr
[i
].addr
;
302 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
303 odhcpd_setup_route(&prefix
, a
->length
, iface
, &a
->peer
.sin6_addr
, add
);
308 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
310 struct dhcpv6_assignment
*c
;
311 if (iface
->ia_addr_len
< 1)
314 // Try honoring the hint first
315 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
316 if (assign
->assigned
) {
317 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
318 if (c
->length
== 128)
321 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
322 list_add_tail(&assign
->head
, &c
->head
);
323 apply_lease(iface
, assign
, true);
327 if (c
->assigned
!= 0)
328 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
332 // Fallback to a variable assignment
334 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
335 if (c
->length
== 128)
338 current
= (current
+ asize
) & (~asize
);
339 if (current
+ asize
< c
->assigned
) {
340 assign
->assigned
= current
;
341 list_add_tail(&assign
->head
, &c
->head
);
342 apply_lease(iface
, assign
, true);
346 if (c
->assigned
!= 0)
347 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
354 static bool assign_na(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
357 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
358 if (!iface
->ia_addr
[i
].has_class
) {
361 } else if (assign
->classes_cnt
) {
362 for (size_t j
= 0; j
< assign
->classes_cnt
; ++j
)
363 if (assign
->classes
[j
] == iface
->ia_addr
[i
].class)
365 } else if (assign
->all_class
) {
373 // Seed RNG with checksum of DUID
375 for (size_t i
= 0; i
< assign
->clid_len
; ++i
)
376 seed
+= assign
->clid_data
[i
];
379 // Try to assign up to 100x
380 for (size_t i
= 0; i
< 100; ++i
) {
382 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
384 struct dhcpv6_assignment
*c
;
385 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
386 if (c
->assigned
> try || c
->length
!= 128) {
387 assign
->assigned
= try;
388 list_add_tail(&assign
->head
, &c
->head
);
390 } else if (c
->assigned
== try) {
400 static int prefixcmp(const void *va
, const void *vb
)
402 const struct odhcpd_ipaddr
*a
= va
, *b
= vb
;
403 uint32_t a_pref
= ((a
->addr
.s6_addr
[0] & 0xfe) != 0xfc) ? a
->preferred
: 1;
404 uint32_t b_pref
= ((b
->addr
.s6_addr
[0] & 0xfe) != 0xfc) ? b
->preferred
: 1;
405 return (a_pref
< b_pref
) ? 1 : (a_pref
> b_pref
) ? -1 : 0;
409 static void update(struct interface
*iface
)
411 struct odhcpd_ipaddr addr
[8];
412 memset(addr
, 0, sizeof(addr
));
413 int len
= odhcpd_get_interface_addresses(iface
->ifindex
, addr
, 8);
418 qsort(addr
, len
, sizeof(*addr
), prefixcmp
);
420 time_t now
= odhcpd_time();
423 for (int i
= 0; i
< len
; ++i
) {
424 if (addr
[i
].prefix
> minprefix
)
425 minprefix
= addr
[i
].prefix
;
427 addr
[i
].addr
.s6_addr32
[2] = 0;
428 addr
[i
].addr
.s6_addr32
[3] = 0;
430 if (addr
[i
].preferred
< UINT32_MAX
- now
)
431 addr
[i
].preferred
+= now
;
433 if (addr
[i
].valid
< UINT32_MAX
- now
)
434 addr
[i
].valid
+= now
;
437 struct dhcpv6_assignment
*border
= list_last_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
438 border
->assigned
= 1 << (64 - minprefix
);
440 bool change
= len
!= (int)iface
->ia_addr_len
;
441 for (int i
= 0; !change
&& i
< len
; ++i
)
442 if (addr
[i
].addr
.s6_addr32
[0] != iface
->ia_addr
[i
].addr
.s6_addr32
[0] ||
443 addr
[i
].addr
.s6_addr32
[1] != iface
->ia_addr
[i
].addr
.s6_addr32
[1] ||
444 (addr
[i
].preferred
> 0) != (iface
->ia_addr
[i
].preferred
> 0) ||
445 (addr
[i
].valid
> (uint32_t)now
+ 7200) !=
446 (iface
->ia_addr
[i
].valid
> (uint32_t)now
+ 7200))
450 struct dhcpv6_assignment
*c
;
451 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
453 apply_lease(iface
, c
, false);
456 memcpy(iface
->ia_addr
, addr
, len
* sizeof(*addr
));
457 iface
->ia_addr_len
= len
;
459 if (change
) { // Addresses / prefixes have changed
460 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
461 struct dhcpv6_assignment
*c
, *d
;
462 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
463 if (c
->clid_len
== 0 || c
->valid_until
< now
)
466 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
467 list_move(&c
->head
, &reassign
);
468 else if (c
!= border
)
469 apply_lease(iface
, c
, true);
471 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
473 c
->reconf_sent
= now
;
474 send_reconf(iface
, c
);
476 // Leave all other assignments of that client alone
477 struct dhcpv6_assignment
*a
;
478 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
479 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
480 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
481 c
->reconf_cnt
= INT_MAX
;
485 while (!list_empty(&reassign
)) {
486 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
488 if (!assign_pd(iface
, c
)) {
490 list_add(&c
->head
, &iface
->ia_assignments
);
494 dhcpv6_write_statefile();
499 static void reconf_timer(struct uloop_timeout
*event
)
501 time_t now
= odhcpd_time();
502 struct interface
*iface
;
503 list_for_each_entry(iface
, &interfaces
, head
) {
504 if (iface
->dhcpv6
!= RELAYD_SERVER
|| iface
->ia_assignments
.next
== NULL
)
507 struct dhcpv6_assignment
*a
, *n
;
508 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
509 if (a
->valid_until
< now
) {
510 if ((a
->length
< 128 && a
->clid_len
> 0) ||
511 (a
->length
== 128 && a
->clid_len
== 0)) {
517 } else if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< 8 &&
518 now
> a
->reconf_sent
+ (1 << a
->reconf_cnt
)) {
520 a
->reconf_sent
= now
;
521 send_reconf(iface
, a
);
525 if (iface
->ia_reconf
) {
527 iface
->ia_reconf
= false;
531 uloop_timeout_set(event
, 2000);
535 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
536 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
537 struct interface
*iface
, bool request
)
539 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
542 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
543 size_t datalen
= sizeof(out
);
544 time_t now
= odhcpd_time();
547 struct __attribute__((packed
)) {
551 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
554 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
555 datalen
+= sizeof(stat
);
558 uint32_t pref
= 3600;
559 uint32_t valid
= 3600;
561 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
563 if (iface
->ia_addr
[i
].has_class
) {
565 if (a
->classes_cnt
) {
566 for (size_t j
= 0; j
< a
->classes_cnt
; ++j
)
567 if (a
->classes
[j
] == iface
->ia_addr
[i
].class)
569 } else if (a
->all_class
) {
577 uint32_t prefix_pref
= iface
->ia_addr
[i
].preferred
- now
;
578 uint32_t prefix_valid
= iface
->ia_addr
[i
].valid
- now
;
580 if (iface
->ia_addr
[i
].prefix
> 64 ||
581 iface
->ia_addr
[i
].preferred
<= (uint32_t)now
)
584 if (prefix_pref
> 86400)
587 if (prefix_valid
> 86400)
588 prefix_valid
= 86400;
590 #ifdef DHCPV6_OPT_PREFIX_CLASS
595 } pclass
= {htons(DHCPV6_OPT_PREFIX_CLASS
),
596 htons(2), htons(iface
->ia_addr
[i
].class)};
599 if (a
->length
< 128) {
600 struct dhcpv6_ia_prefix p
= {
601 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
602 .len
= htons(sizeof(p
) - 4),
603 .preferred
= htonl(prefix_pref
),
604 .valid
= htonl(prefix_valid
),
606 .addr
= iface
->ia_addr
[i
].addr
608 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
609 size_t entrlen
= sizeof(p
) - 4;
611 #ifdef DHCPV6_OPT_PREFIX_CLASS
612 if (iface
->ia_addr
[i
].has_class
) {
613 entrlen
+= sizeof(pclass
);
614 p
.len
= htons(entrlen
);
618 if (datalen
+ entrlen
+ 4 > buflen
|| a
->assigned
== 0)
621 memcpy(buf
+ datalen
, &p
, sizeof(p
));
622 #ifdef DHCPV6_OPT_PREFIX_CLASS
623 memcpy(buf
+ datalen
+ sizeof(p
), &pclass
, sizeof(pclass
));
625 datalen
+= entrlen
+ 4;
627 struct dhcpv6_ia_addr n
= {
628 .type
= htons(DHCPV6_OPT_IA_ADDR
),
629 .len
= htons(sizeof(n
) - 4),
630 .addr
= iface
->ia_addr
[i
].addr
,
631 .preferred
= htonl(prefix_pref
),
632 .valid
= htonl(prefix_valid
)
634 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
635 size_t entrlen
= sizeof(n
) - 4;
637 #ifdef DHCPV6_OPT_PREFIX_CLASS
638 if (iface
->ia_addr
[i
].has_class
) {
639 entrlen
+= sizeof(pclass
);
640 n
.len
= htons(entrlen
);
644 if (datalen
+ entrlen
+ 4 > buflen
|| a
->assigned
== 0)
647 memcpy(buf
+ datalen
, &n
, sizeof(n
));
648 #ifdef DHCPV6_OPT_PREFIX_CLASS
649 memcpy(buf
+ datalen
+ sizeof(n
), &pclass
, sizeof(pclass
));
651 datalen
+= entrlen
+ 4;
654 // Calculate T1 / T2 based on non-deprecated addresses
655 if (prefix_pref
> 0) {
656 if (prefix_pref
< pref
)
659 if (prefix_valid
< valid
)
660 valid
= prefix_valid
;
664 a
->valid_until
= valid
+ now
;
665 out
.t1
= htonl(pref
* 5 / 10);
666 out
.t2
= htonl(pref
* 8 / 10);
676 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
677 uint16_t otype
, olen
;
678 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
679 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
680 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
681 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
682 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
687 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
688 if (iface
->ia_addr
[i
].prefix
> 64 ||
689 iface
->ia_addr
[i
].preferred
<= (uint32_t)now
)
692 struct in6_addr addr
= iface
->ia_addr
[i
].addr
;
693 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
694 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
696 if (IN6_ARE_ADDR_EQUAL(&p
->addr
, &addr
) &&
697 p
->prefix
== a
->length
)
700 addr
.s6_addr32
[3] = htonl(a
->assigned
);
702 if (IN6_ARE_ADDR_EQUAL(&n
->addr
, &addr
))
709 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
710 struct dhcpv6_ia_prefix inv
= {
711 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
712 .len
= htons(sizeof(inv
) - 4),
719 if (datalen
+ sizeof(inv
) > buflen
)
722 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
723 datalen
+= sizeof(inv
);
725 struct dhcpv6_ia_addr inv
= {
726 .type
= htons(DHCPV6_OPT_IA_ADDR
),
727 .len
= htons(sizeof(inv
) - 4),
733 if (datalen
+ sizeof(inv
) > buflen
)
736 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
737 datalen
+= sizeof(inv
);
744 out
.len
= htons(datalen
- 4);
745 memcpy(buf
, &out
, sizeof(out
));
750 size_t dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
751 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
753 time_t now
= odhcpd_time();
754 size_t response_len
= 0;
755 const struct dhcpv6_client_header
*hdr
= data
;
756 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
757 uint16_t otype
, olen
;
759 // Find and parse client-id and hostname
760 bool accept_reconf
= false;
761 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
763 size_t hostname_len
= 0;
764 bool class_oro
= false;
765 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
766 if (otype
== DHCPV6_OPT_CLIENTID
) {
770 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
771 memcpy(mac
, &odata
[8], sizeof(mac
));
772 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
773 memcpy(mac
, &odata
[4], sizeof(mac
));
774 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
775 uint8_t fqdn_buf
[256];
776 memcpy(fqdn_buf
, odata
, olen
);
777 fqdn_buf
[olen
++] = 0;
779 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
780 hostname_len
= strcspn(hostname
, ".");
781 } else if (otype
== DHCPV6_OPT_ORO
) {
782 #ifdef DHCPV6_OPT_PREFIX_CLASS
783 for (size_t i
= 0; i
+ 1 < olen
; i
+= 2) {
784 if (odata
[i
] == (DHCPV6_OPT_PREFIX_CLASS
>> 8) &&
785 odata
[i
+ 1] == (DHCPV6_OPT_PREFIX_CLASS
& 0xff))
789 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
790 accept_reconf
= true;
794 if (!clid_data
|| !clid_len
|| clid_len
> 130)
798 bool update_state
= false;
800 struct dhcpv6_assignment
*first
= NULL
;
801 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
802 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
803 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
804 if (!is_pd
&& !is_na
)
807 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
808 size_t ia_response_len
= 0;
809 uint8_t reqlen
= (is_pd
) ? 62 : 128;
810 uint32_t reqhint
= 0;
812 const uint8_t classes_max
= 32;
813 uint8_t classes_cnt
= 0;
814 uint16_t classes
[classes_max
];
816 // Parse request hint for IA-PD
819 uint16_t stype
, slen
;
820 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
821 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
824 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
827 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
828 if (reqlen
> 32 && reqlen
<= 64)
829 reqhint
&= (1U << (64 - reqlen
)) - 1;
832 #ifdef DHCPV6_OPT_PREFIX_CLASS
834 uint16_t xtype
, xlen
;
835 dhcpv6_for_each_option(&p
[1], sdata
+ slen
, xtype
, xlen
, xdata
) {
836 if (xtype
!= DHCPV6_OPT_PREFIX_CLASS
|| xlen
!= 2)
839 if (classes_cnt
>= classes_max
)
842 classes
[classes_cnt
++] = (uint16_t)xdata
[0] << 8 | (uint16_t)xdata
[1];
851 uint16_t stype
, slen
;
852 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
853 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
856 #ifdef DHCPV6_OPT_PREFIX_CLASS
858 uint16_t xtype
, xlen
;
859 struct dhcpv6_ia_addr
*p
= (struct dhcpv6_ia_addr
*)&sdata
[-4];
860 dhcpv6_for_each_option(&p
[1], sdata
+ slen
, xtype
, xlen
, xdata
) {
861 if (xtype
!= DHCPV6_OPT_PREFIX_CLASS
|| xlen
!= 2)
864 if (classes_cnt
>= classes_max
)
867 classes
[classes_cnt
++] = (uint16_t)xdata
[0] << 8 | (uint16_t)xdata
[1];
874 struct dhcpv6_assignment
*c
, *a
= NULL
;
875 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
876 if (((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) ||
877 (c
->clid_len
>= clid_len
&& !c
->clid_data
[0] && !c
->clid_data
[1]
878 && !memcmp(c
->mac
, mac
, sizeof(mac
)))) &&
879 (c
->iaid
== ia
->iaid
|| c
->valid_until
< now
) &&
880 ((is_pd
&& c
->length
<= 64) || (is_na
&& c
->length
== 128))) {
884 apply_lease(iface
, a
, false);
885 memcpy(a
->clid_data
, clid_data
, clid_len
);
886 a
->clid_len
= clid_len
;
891 a
->all_class
= class_oro
;
892 a
->classes_cnt
= classes_cnt
;
893 a
->classes
= realloc(a
->classes
, classes_cnt
* sizeof(uint16_t));
895 memcpy(a
->classes
, classes
, classes_cnt
* sizeof(uint16_t));
900 // Generic message handling
901 uint16_t status
= DHCPV6_STATUS_OK
;
902 if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
|| hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
905 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
906 a
= calloc(1, sizeof(*a
) + clid_len
);
908 a
->clid_len
= clid_len
;
912 a
->assigned
= reqhint
;
913 a
->all_class
= class_oro
;
914 a
->classes_cnt
= classes_cnt
;
916 a
->classes
= malloc(classes_cnt
* sizeof(uint16_t));
918 memcpy(a
->classes
, classes
, classes_cnt
* sizeof(uint16_t));
922 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
924 odhcpd_urandom(a
->key
, sizeof(a
->key
));
925 memcpy(a
->clid_data
, clid_data
, clid_len
);
928 while (!(assigned
= assign_pd(iface
, a
)) && ++a
->length
<= 64);
930 assigned
= assign_na(iface
, a
);
934 if (!assigned
|| iface
->ia_addr_len
== 0) { // Set error status
935 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
936 } else if (assigned
&& !first
) { //
937 size_t handshake_len
= 4;
939 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
943 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
944 struct dhcpv6_auth_reconfigure auth
= {
945 htons(DHCPV6_OPT_AUTH
),
946 htons(sizeof(auth
) - 4),
948 {htonl(time(NULL
)), htonl(++serial
)},
952 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
953 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
954 handshake_len
+= sizeof(auth
);
957 buf
+= handshake_len
;
958 buflen
-= handshake_len
;
959 response_len
+= handshake_len
;
964 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
966 // Was only a solicitation: mark binding for removal
967 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
969 } else if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
970 if (hostname_len
> 0) {
971 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
973 memcpy(a
->hostname
, hostname
, hostname_len
);
974 a
->hostname
[hostname_len
] = 0;
977 a
->accept_reconf
= accept_reconf
;
978 apply_lease(iface
, a
, true);
980 } else if (!assigned
&& a
) { // Cleanup failed assignment
985 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
986 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
987 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
988 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
989 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
990 status
= DHCPV6_STATUS_NOBINDING
;
991 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
992 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
993 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
994 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
996 apply_lease(iface
, a
, true);
997 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
999 apply_lease(iface
, a
, false);
1000 update_state
= true;
1001 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128) {
1003 a
->valid_until
= now
+ 3600; // Block address for 1h
1004 update_state
= true;
1006 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
) {
1007 // Always send NOTONLINK for CONFIRM so that clients restart connection
1008 status
= DHCPV6_STATUS_NOTONLINK
;
1009 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1012 buf
+= ia_response_len
;
1013 buflen
-= ia_response_len
;
1014 response_len
+= ia_response_len
;
1017 if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
&& response_len
+ 6 < buflen
) {
1019 buf
[1] = DHCPV6_OPT_STATUS
;
1023 buf
[5] = DHCPV6_STATUS_OK
;
1028 dhcpv6_write_statefile();
1031 return response_len
;