2 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
19 #include "libubox/md5.h"
20 #include "libubox/usock.h"
34 #include <arpa/inet.h>
35 #include <sys/timerfd.h>
37 #define ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) \
38 ((iface)->managed == RELAYD_MANAGED_NO_AFLAG || (i) == (m) || \
39 (addrs)[(i)].prefix > 64)
41 static void free_dhcpv6_assignment(struct dhcpv6_assignment
*c
);
42 static void reconf_timer(struct uloop_timeout
*event
);
43 static struct uloop_timeout reconf_event
= {.cb
= reconf_timer
};
44 static uint32_t serial
= 0;
45 static uint8_t statemd5
[16];
47 int dhcpv6_ia_init(void)
49 uloop_timeout_set(&reconf_event
, 2000);
53 int setup_dhcpv6_ia_interface(struct interface
*iface
, bool enable
)
55 if (!enable
&& iface
->ia_assignments
.next
) {
56 struct dhcpv6_assignment
*c
;
58 while (!list_empty(&iface
->ia_assignments
)) {
59 c
= list_first_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
60 free_dhcpv6_assignment(c
);
64 if (enable
&& iface
->dhcpv6
== RELAYD_SERVER
) {
65 if (!iface
->ia_assignments
.next
)
66 INIT_LIST_HEAD(&iface
->ia_assignments
);
68 if (list_empty(&iface
->ia_assignments
)) {
69 struct dhcpv6_assignment
*border
= calloc(1, sizeof(*border
));
71 syslog(LOG_ERR
, "Calloc failed for border on interface %s", iface
->ifname
);
76 list_add(&border
->head
, &iface
->ia_assignments
);
79 /* Parse static entries */
81 list_for_each_entry(lease
, &leases
, head
) {
83 size_t duid_len
= lease
->duid_len
? lease
->duid_len
: 14;
84 struct dhcpv6_assignment
*a
= calloc(1, sizeof(*a
) + duid_len
);
86 syslog(LOG_ERR
, "Calloc failed for static lease assignment on interface %s",
91 a
->leasetime
= lease
->dhcpv4_leasetime
;
93 a
->clid_len
= duid_len
;
96 a
->assigned
= lease
->hostid
;
98 uint32_t i4a
= ntohl(lease
->ipaddr
.s_addr
) & 0xff;
99 a
->assigned
= ((i4a
/ 100) << 8) | (((i4a
% 100) / 10) << 4) | (i4a
% 10);
102 odhcpd_urandom(a
->key
, sizeof(a
->key
));
103 memcpy(a
->clid_data
, lease
->duid
, lease
->duid_len
);
104 memcpy(a
->mac
, lease
->mac
.ether_addr_octet
, sizeof(a
->mac
));
105 /* Static assignment */
106 a
->flags
|= OAF_STATIC
;
110 /* Assign to all interfaces */
111 struct dhcpv6_assignment
*c
;
112 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
113 if (c
->length
!= 128 || c
->assigned
> a
->assigned
) {
114 list_add_tail(&a
->head
, &c
->head
);
116 } else if (c
->assigned
== a
->assigned
)
117 /* Already an assignment with that number */
122 if (lease
->hostname
[0]) {
124 a
->hostname
= strdup(lease
->hostname
);
127 free_dhcpv6_assignment(a
);
133 static void free_dhcpv6_assignment(struct dhcpv6_assignment
*c
)
135 if (c
->managed_sock
.fd
.registered
) {
136 ustream_free(&c
->managed_sock
.stream
);
137 close(c
->managed_sock
.fd
.fd
);
148 static inline bool valid_prefix_length(const struct dhcpv6_assignment
*a
, const uint8_t prefix_length
)
150 return (a
->managed_size
|| a
->length
> prefix_length
);
153 static inline bool valid_addr(const struct odhcpd_ipaddr
*addr
, time_t now
)
155 return (addr
->prefix
<= 96 && addr
->preferred
> (uint32_t)now
);
158 static size_t elect_addr(const struct odhcpd_ipaddr
*addrs
, const size_t addrlen
)
162 for (i
= 0, m
= 0; i
< addrlen
; ++i
) {
163 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
164 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
165 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
172 static int send_reconf(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
175 struct dhcpv6_client_header hdr
;
179 uint16_t hardware_type
;
184 struct dhcpv6_auth_reconfigure auth
;
187 uint8_t clid_data
[128];
188 } __attribute__((packed
)) reconf_msg
= {
189 .hdr
= {DHCPV6_MSG_RECONFIGURE
, {0, 0, 0}},
190 .srvid_type
= htons(DHCPV6_OPT_SERVERID
),
191 .srvid_len
= htons(10),
192 .duid_type
= htons(3),
193 .hardware_type
= htons(1),
194 .msg_type
= htons(DHCPV6_OPT_RECONF_MSG
),
196 .msg_id
= DHCPV6_MSG_RENEW
,
197 .auth
= {htons(DHCPV6_OPT_AUTH
),
198 htons(sizeof(reconf_msg
.auth
) - 4), 3, 1, 0,
199 {htonl(time(NULL
)), htonl(++serial
)}, 2, {0}},
200 .clid_type
= htons(DHCPV6_OPT_CLIENTID
),
201 .clid_len
= htons(assign
->clid_len
),
205 odhcpd_get_mac(iface
, reconf_msg
.mac
);
206 memcpy(reconf_msg
.clid_data
, assign
->clid_data
, assign
->clid_len
);
207 struct iovec iov
= {&reconf_msg
, sizeof(reconf_msg
) - 128 + assign
->clid_len
};
210 uint8_t secretbytes
[64];
211 memset(secretbytes
, 0, sizeof(secretbytes
));
212 memcpy(secretbytes
, assign
->key
, sizeof(assign
->key
));
214 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
215 secretbytes
[i
] ^= 0x36;
218 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
219 md5_hash(iov
.iov_base
, iov
.iov_len
, &md5
);
220 md5_end(reconf_msg
.auth
.key
, &md5
);
222 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
223 secretbytes
[i
] ^= 0x36;
224 secretbytes
[i
] ^= 0x5c;
228 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
229 md5_hash(reconf_msg
.auth
.key
, 16, &md5
);
230 md5_end(reconf_msg
.auth
.key
, &md5
);
232 return odhcpd_send(iface
->dhcpv6_event
.uloop
.fd
, &assign
->peer
, &iov
, 1, iface
);
235 void dhcpv6_write_statefile(void)
240 if (config
.dhcp_statefile
) {
241 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
242 int fd
= open(config
.dhcp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
246 ret
= lockf(fd
, F_LOCK
, 0);
251 if (ftruncate(fd
, 0) < 0) {}
253 FILE *fp
= fdopen(fd
, "w");
259 struct interface
*iface
;
260 list_for_each_entry(iface
, &interfaces
, head
) {
261 if (iface
->dhcpv6
!= RELAYD_SERVER
&& iface
->dhcpv4
!= RELAYD_SERVER
)
264 if (iface
->dhcpv6
== RELAYD_SERVER
&& iface
->ia_assignments
.next
) {
265 struct dhcpv6_assignment
*c
;
266 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
267 if (!(c
->flags
& OAF_BOUND
) || c
->managed_size
< 0)
270 char ipbuf
[INET6_ADDRSTRLEN
];
273 odhcpd_hexlify(duidbuf
, c
->clid_data
, c
->clid_len
);
275 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
276 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s %x %s %ld %x %u ",
277 iface
->ifname
, duidbuf
, ntohl(c
->iaid
),
278 (c
->hostname
? c
->hostname
: "-"),
279 (c
->valid_until
> now
?
280 (c
->valid_until
- now
+ wall_time
) :
281 (INFINITE_VALID(c
->valid_until
) ? -1 : 0)),
282 c
->assigned
, (unsigned)c
->length
);
284 struct in6_addr addr
;
285 struct odhcpd_ipaddr
*addrs
= (c
->managed
) ? c
->managed
: iface
->ia_addr
;
286 size_t addrlen
= (c
->managed
) ? (size_t)c
->managed_size
: iface
->ia_addr_len
;
287 size_t m
= elect_addr(addrs
, addrlen
);
289 for (size_t i
= 0; i
< addrlen
; ++i
) {
290 if (!valid_addr(&addrs
[i
], now
) ||
291 (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
<= now
))
294 addr
= addrs
[i
].addr
;
295 if (c
->length
== 128) {
296 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
))
299 addr
.s6_addr32
[3] = htonl(c
->assigned
);
301 if (!valid_prefix_length(c
, addrs
[i
].prefix
))
304 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
305 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
308 inet_ntop(AF_INET6
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
310 if (c
->length
== 128 && c
->hostname
) {
314 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
315 iface
->search
, b
, sizeof(b
)) > 0)
316 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
318 fprintf(fp
, "\t%s\n", c
->hostname
);
319 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
320 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
323 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/%d ", ipbuf
,
324 (c
->managed_size
) ? addrs
[i
].prefix
: c
->length
);
326 leasebuf
[l
- 1] = '\n';
327 fwrite(leasebuf
, 1, l
, fp
);
331 if (iface
->dhcpv4
== RELAYD_SERVER
&& iface
->dhcpv4_assignments
.next
) {
332 struct dhcpv4_assignment
*c
;
333 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
334 if (!(c
->flags
& OAF_BOUND
))
337 char ipbuf
[INET6_ADDRSTRLEN
];
340 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
342 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
343 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s ipv4 %s %ld %x 32 ",
344 iface
->ifname
, duidbuf
,
345 (c
->hostname
? c
->hostname
: "-"),
346 (c
->valid_until
> now
?
347 (c
->valid_until
- now
+ wall_time
) :
348 (INFINITE_VALID(c
->valid_until
) ? -1 : 0)),
351 struct in_addr addr
= {htonl(c
->addr
)};
352 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
358 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
359 iface
->search
, b
, sizeof(b
)) > 0)
360 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
362 fprintf(fp
, "\t%s\n", c
->hostname
);
363 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
364 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
367 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/32 ", ipbuf
);
368 leasebuf
[l
- 1] = '\n';
369 fwrite(leasebuf
, 1, l
, fp
);
378 md5_end(newmd5
, &md5
);
380 if (config
.dhcp_cb
&& memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
381 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
382 char *argv
[2] = {config
.dhcp_cb
, NULL
};
384 execv(argv
[0], argv
);
391 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
393 if (a
->length
> 64 || a
->managed_size
< 0)
396 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
397 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
399 for (size_t i
= 0; i
< addrlen
; ++i
) {
400 struct in6_addr prefix
= addrs
[i
].addr
;
401 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
402 prefix
.s6_addr32
[2] = prefix
.s6_addr32
[3] = 0;
403 odhcpd_setup_route(&prefix
, (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
404 iface
, &a
->peer
.sin6_addr
, 1024, add
);
408 /* More data was received from TCP connection */
409 static void managed_handle_pd_data(struct ustream
*s
, _unused
int bytes_new
)
411 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
412 time_t now
= odhcpd_time();
413 bool first
= c
->managed_size
< 0;
417 char *data
= ustream_get_read_buf(s
, &pending
);
418 char *end
= memmem(data
, pending
, "\n\n", 2);
427 if (c
->accept_reconf
)
431 for (char *line
= strtok_r(data
, "\n", &saveptr
); line
; line
= strtok_r(NULL
, "\n", &saveptr
)) {
432 c
->managed
= realloc(c
->managed
, (c
->managed_size
+ 1) * sizeof(*c
->managed
));
433 struct odhcpd_ipaddr
*n
= &c
->managed
[c
->managed_size
];
435 char *saveptr2
, *x
= strtok_r(line
, "/", &saveptr2
);
436 if (!x
|| inet_pton(AF_INET6
, x
, &n
->addr
) < 1)
439 x
= strtok_r(NULL
, ",", &saveptr2
);
440 if (sscanf(x
, "%hhu", &n
->prefix
) < 1)
443 x
= strtok_r(NULL
, ",", &saveptr2
);
444 if (sscanf(x
, "%u", &n
->preferred
) < 1)
447 x
= strtok_r(NULL
, ",", &saveptr2
);
448 if (sscanf(x
, "%u", &n
->valid
) < 1)
451 if (n
->preferred
> n
->valid
)
454 if (UINT32_MAX
- now
< n
->preferred
)
455 n
->preferred
= UINT32_MAX
;
459 if (UINT32_MAX
- now
< n
->valid
)
460 n
->valid
= UINT32_MAX
;
469 ustream_consume(s
, end
- data
);
472 if (first
&& c
->managed_size
== 0)
473 free_dhcpv6_assignment(c
);
474 else if (first
&& !(c
->flags
& OAF_STATIC
))
475 c
->valid_until
= now
+ 150;
479 /* TCP transmission has ended, either because of success or timeout or other error */
480 static void managed_handle_pd_done(struct ustream
*s
)
482 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
484 if (!(c
->flags
& OAF_STATIC
))
485 c
->valid_until
= odhcpd_time() + 15;
489 if (c
->accept_reconf
)
493 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
495 struct dhcpv6_assignment
*c
;
497 if (iface
->dhcpv6_pd_manager
[0]) {
498 int fd
= usock(USOCK_UNIX
| USOCK_TCP
, iface
->dhcpv6_pd_manager
, NULL
);
501 odhcpd_hexlify(iaidbuf
, assign
->clid_data
, assign
->clid_len
);
503 assign
->managed_sock
.stream
.notify_read
= managed_handle_pd_data
;
504 assign
->managed_sock
.stream
.notify_state
= managed_handle_pd_done
;
505 ustream_fd_init(&assign
->managed_sock
, fd
);
506 ustream_printf(&assign
->managed_sock
.stream
, "%s,%x\n::/%d,0,0\n\n",
507 iaidbuf
, assign
->iaid
, assign
->length
);
508 ustream_write_pending(&assign
->managed_sock
.stream
);
509 assign
->managed_size
= -1;
511 if (!(assign
->flags
& OAF_STATIC
))
512 assign
->valid_until
= odhcpd_time() + 15;
514 list_add(&assign
->head
, &iface
->ia_assignments
);
516 /* Wait initial period of up to 250ms for immediate assignment */
517 struct pollfd pfd
= { .fd
= fd
, .events
= POLLIN
};
519 managed_handle_pd_data(&assign
->managed_sock
.stream
, 0);
521 if (fcntl(fd
, F_GETFL
) >= 0 && assign
->managed_size
> 0)
526 } else if (iface
->ia_addr_len
< 1)
529 /* Try honoring the hint first */
530 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
531 if (assign
->assigned
) {
532 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
533 if (c
->length
== 128 || c
->length
== 0)
536 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
537 list_add_tail(&assign
->head
, &c
->head
);
539 if (assign
->flags
& OAF_BOUND
)
540 apply_lease(iface
, assign
, true);
545 if (c
->assigned
!= 0)
546 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
550 /* Fallback to a variable assignment */
552 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
553 if (c
->length
== 128 || c
->length
== 0)
556 current
= (current
+ asize
) & (~asize
);
557 if (current
+ asize
< c
->assigned
) {
558 assign
->assigned
= current
;
559 list_add_tail(&assign
->head
, &c
->head
);
561 if (assign
->flags
& OAF_BOUND
)
562 apply_lease(iface
, assign
, true);
567 if (c
->assigned
!= 0)
568 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
574 static bool assign_na(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
576 /* Seed RNG with checksum of DUID */
578 for (size_t i
= 0; i
< assign
->clid_len
; ++i
)
579 seed
+= assign
->clid_data
[i
];
582 /* Try to assign up to 100x */
583 for (size_t i
= 0; i
< 100; ++i
) {
585 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
587 struct dhcpv6_assignment
*c
;
588 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
592 if (c
->assigned
> try || c
->length
!= 128) {
593 assign
->assigned
= try;
594 list_add_tail(&assign
->head
, &c
->head
);
596 } else if (c
->assigned
== try)
604 void dhcpv6_ia_preupdate(struct interface
*iface
)
606 if (iface
->dhcpv6
!= RELAYD_SERVER
)
609 struct dhcpv6_assignment
*c
, *border
= list_last_entry(
610 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
612 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
613 if (c
!= border
&& !iface
->managed
&& (c
->flags
& OAF_BOUND
))
614 apply_lease(iface
, c
, false);
617 void dhcpv6_ia_postupdate(struct interface
*iface
, time_t now
)
619 if (iface
->dhcpv6
!= RELAYD_SERVER
)
623 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
624 if (iface
->ia_addr
[i
].preferred
> (uint32_t)now
&&
625 iface
->ia_addr
[i
].prefix
< 64 &&
626 iface
->ia_addr
[i
].prefix
> minprefix
)
627 minprefix
= iface
->ia_addr
[i
].prefix
;
630 struct dhcpv6_assignment
*border
= list_last_entry(
631 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
633 if (minprefix
> 32 && minprefix
<= 64)
634 border
->assigned
= 1U << (64 - minprefix
);
636 border
->assigned
= 0;
638 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
639 struct dhcpv6_assignment
*c
, *d
;
640 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
641 if (c
->clid_len
== 0 || (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
< now
) ||
645 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
646 list_move(&c
->head
, &reassign
);
647 else if (c
!= border
&& (c
->flags
& OAF_BOUND
))
648 apply_lease(iface
, c
, true);
650 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
652 c
->reconf_sent
= now
;
653 send_reconf(iface
, c
);
655 /* Leave all other assignments of that client alone */
656 struct dhcpv6_assignment
*a
;
657 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
658 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
659 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
660 c
->reconf_cnt
= INT_MAX
;
664 while (!list_empty(&reassign
)) {
665 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
667 if (!assign_pd(iface
, c
)) {
669 list_add(&c
->head
, &iface
->ia_assignments
);
673 dhcpv6_write_statefile();
676 static void reconf_timer(struct uloop_timeout
*event
)
678 time_t now
= odhcpd_time();
679 struct interface
*iface
;
680 list_for_each_entry(iface
, &interfaces
, head
) {
681 if (iface
->dhcpv6
!= RELAYD_SERVER
|| iface
->ia_assignments
.next
== NULL
)
684 struct dhcpv6_assignment
*a
, *n
;
685 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
686 if (!INFINITE_VALID(a
->valid_until
) && a
->valid_until
< now
) {
687 if ((a
->length
< 128 && a
->clid_len
> 0) ||
688 (a
->length
== 128 && a
->clid_len
== 0))
689 free_dhcpv6_assignment(a
);
691 } else if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< 8 &&
692 now
> a
->reconf_sent
+ (1 << a
->reconf_cnt
)) {
694 a
->reconf_sent
= now
;
695 send_reconf(iface
, a
);
699 uloop_timeout_set(event
, 2000);
702 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
703 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
704 struct interface
*iface
, bool request
)
706 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
709 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
710 size_t datalen
= sizeof(out
);
711 time_t now
= odhcpd_time();
714 struct __attribute__((packed
)) {
718 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
721 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
722 datalen
+= sizeof(stat
);
727 leasetime
= a
->leasetime
;
729 leasetime
= iface
->dhcpv4_leasetime
;
731 uint32_t pref
= leasetime
;
732 uint32_t valid
= leasetime
;
734 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
735 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
736 size_t m
= elect_addr(addrs
, addrlen
);
738 for (size_t i
= 0; i
< addrlen
; ++i
) {
739 uint32_t prefix_pref
= addrs
[i
].preferred
;
740 uint32_t prefix_valid
= addrs
[i
].valid
;
742 if (!valid_addr(&addrs
[i
], now
))
745 if (prefix_pref
!= UINT32_MAX
)
748 if (prefix_valid
!= UINT32_MAX
)
751 if (a
->length
< 128) {
752 struct dhcpv6_ia_prefix p
= {
753 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
754 .len
= htons(sizeof(p
) - 4),
755 .preferred
= htonl(prefix_pref
),
756 .valid
= htonl(prefix_valid
),
757 .prefix
= (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
758 .addr
= addrs
[i
].addr
760 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
761 p
.addr
.s6_addr32
[2] = p
.addr
.s6_addr32
[3] = 0;
763 size_t entrlen
= sizeof(p
) - 4;
765 if (datalen
+ entrlen
+ 4 > buflen
||
766 (a
->assigned
== 0 && a
->managed_size
== 0) ||
767 !valid_prefix_length(a
, addrs
[i
].prefix
))
770 memcpy(buf
+ datalen
, &p
, sizeof(p
));
771 datalen
+= entrlen
+ 4;
773 struct dhcpv6_ia_addr n
= {
774 .type
= htons(DHCPV6_OPT_IA_ADDR
),
775 .len
= htons(sizeof(n
) - 4),
776 .addr
= addrs
[i
].addr
,
777 .preferred
= htonl(prefix_pref
),
778 .valid
= htonl(prefix_valid
)
780 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
781 size_t entrlen
= sizeof(n
) - 4;
783 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
) ||
785 datalen
+ entrlen
+ 4 > buflen
)
788 memcpy(buf
+ datalen
, &n
, sizeof(n
));
789 datalen
+= entrlen
+ 4;
792 /* Calculate T1 / T2 based on non-deprecated addresses */
793 if (prefix_pref
> 0) {
794 if (prefix_pref
< pref
)
797 if (prefix_valid
< valid
)
798 valid
= prefix_valid
;
802 if (!INFINITE_VALID(a
->valid_until
))
803 /* UINT32_MAX is considered as infinite leasetime */
804 a
->valid_until
= (valid
== UINT32_MAX
) ? 0 : valid
+ now
;
806 out
.t1
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 5 / 10);
807 out
.t2
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 8 / 10);
817 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
818 uint16_t otype
, olen
;
819 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
820 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
821 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
822 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
823 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
828 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
829 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
831 for (size_t i
= 0; i
< addrlen
; ++i
) {
832 if (!valid_addr(&addrs
[i
], now
))
835 struct in6_addr addr
= addrs
[i
].addr
;
836 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
837 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
838 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
840 if (!memcmp(&p
->addr
, &addr
, sizeof(addr
)) &&
841 p
->prefix
== ((a
->managed
) ? addrs
[i
].prefix
: a
->length
))
844 addr
.s6_addr32
[3] = htonl(a
->assigned
);
846 if (!memcmp(&n
->addr
, &addr
, sizeof(addr
)))
853 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
854 struct dhcpv6_ia_prefix inv
= {
855 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
856 .len
= htons(sizeof(inv
) - 4),
863 if (datalen
+ sizeof(inv
) > buflen
)
866 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
867 datalen
+= sizeof(inv
);
869 struct dhcpv6_ia_addr inv
= {
870 .type
= htons(DHCPV6_OPT_IA_ADDR
),
871 .len
= htons(sizeof(inv
) - 4),
877 if (datalen
+ sizeof(inv
) > buflen
)
880 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
881 datalen
+= sizeof(inv
);
888 out
.len
= htons(datalen
- 4);
889 memcpy(buf
, &out
, sizeof(out
));
893 static void dhcpv6_log(uint8_t msgtype
, struct interface
*iface
, time_t now
,
894 const char *duidbuf
, bool is_pd
, struct dhcpv6_assignment
*a
, int code
)
896 const char *type
= "UNKNOWN";
897 const char *status
= "UNKNOWN";
899 if (msgtype
== DHCPV6_MSG_RENEW
)
903 case DHCPV6_MSG_SOLICIT
:
906 case DHCPV6_MSG_REQUEST
:
909 case DHCPV6_MSG_CONFIRM
:
912 case DHCPV6_MSG_RENEW
:
915 case DHCPV6_MSG_REBIND
:
918 case DHCPV6_MSG_RELEASE
:
921 case DHCPV6_MSG_DECLINE
:
927 case DHCPV6_STATUS_OK
:
930 case DHCPV6_STATUS_NOADDRSAVAIL
:
931 status
= "no addresses available";
933 case DHCPV6_STATUS_NOBINDING
:
934 status
= "no binding";
936 case DHCPV6_STATUS_NOTONLINK
:
937 status
= "not on-link";
939 case DHCPV6_STATUS_NOPREFIXAVAIL
:
940 status
= "no prefix available";
944 char leasebuf
[256] = "";
947 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
948 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
950 size_t m
= elect_addr(addrs
, addrlen
);
951 char addrbuf
[INET6_ADDRSTRLEN
];
953 for (size_t i
= 0; i
< addrlen
; ++i
) {
954 if (!valid_addr(&addrs
[i
], now
))
957 struct in6_addr addr
= addrs
[i
].addr
;
958 int prefix
= a
->managed
? addrs
[i
].prefix
: a
->length
;
960 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
) ||
964 addr
.s6_addr32
[3] = htonl(a
->assigned
);
967 if (!valid_prefix_length(a
, addrs
[i
].prefix
))
970 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
971 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
974 inet_ntop(AF_INET6
, &addr
, addrbuf
, sizeof(addrbuf
));
975 lbsize
+= snprintf(leasebuf
+ lbsize
, sizeof(leasebuf
) - lbsize
, "%s/%d ", addrbuf
, prefix
);
979 syslog(LOG_WARNING
, "DHCPV6 %s %s from %s on %s: %s %s", type
, (is_pd
) ? "IA_PD" : "IA_NA",
980 duidbuf
, iface
->ifname
, status
, leasebuf
);
983 ssize_t
dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
984 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
986 time_t now
= odhcpd_time();
987 size_t response_len
= 0;
988 const struct dhcpv6_client_header
*hdr
= data
;
989 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
990 uint16_t otype
, olen
;
991 /* Find and parse client-id and hostname */
992 bool accept_reconf
= false;
993 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
995 size_t hostname_len
= 0;
996 bool notonlink
= false;
999 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1000 if (otype
== DHCPV6_OPT_CLIENTID
) {
1004 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
1005 memcpy(mac
, &odata
[8], sizeof(mac
));
1006 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
1007 memcpy(mac
, &odata
[4], sizeof(mac
));
1010 odhcpd_hexlify(duidbuf
, odata
, olen
);
1011 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
1012 uint8_t fqdn_buf
[256];
1013 memcpy(fqdn_buf
, odata
, olen
);
1014 fqdn_buf
[olen
++] = 0;
1016 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
1017 hostname_len
= strcspn(hostname
, ".");
1018 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
)
1019 accept_reconf
= true;
1022 if (!clid_data
|| !clid_len
|| clid_len
> 130)
1025 struct dhcpv6_assignment
*first
= NULL
;
1026 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1027 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
1028 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
1029 bool ia_addr_present
= false;
1030 if (!is_pd
&& !is_na
)
1033 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
1034 size_t ia_response_len
= 0;
1035 uint8_t reqlen
= (is_pd
) ? 62 : 128;
1036 uint32_t reqhint
= 0;
1038 /* Parse request hint for IA-PD */
1041 uint16_t stype
, slen
;
1042 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1043 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
1046 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
1049 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
1050 if (reqlen
> 32 && reqlen
<= 64)
1051 reqhint
&= (1U << (64 - reqlen
)) - 1;
1059 uint16_t stype
, slen
;
1060 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1061 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
1064 ia_addr_present
= true;
1068 /* Find assignment */
1069 struct dhcpv6_assignment
*c
, *a
= NULL
;
1070 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
1071 if (((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) ||
1072 (c
->clid_len
>= clid_len
&& !c
->clid_data
[0] && !c
->clid_data
[1]
1073 && !memcmp(c
->mac
, mac
, sizeof(mac
)))) &&
1074 (c
->iaid
== ia
->iaid
|| INFINITE_VALID(c
->valid_until
) || now
< c
->valid_until
) &&
1075 ((is_pd
&& c
->length
<= 64) || (is_na
&& c
->length
== 128))) {
1079 if (a
->flags
& OAF_BOUND
)
1080 apply_lease(iface
, a
, false);
1082 memcpy(a
->clid_data
, clid_data
, clid_len
);
1083 a
->clid_len
= clid_len
;
1092 /* Generic message handling */
1093 uint16_t status
= DHCPV6_STATUS_OK
;
1094 if (a
&& a
->managed_size
< 0)
1097 if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
|| hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1098 bool assigned
= !!a
;
1100 if (!a
&& !iface
->no_dynamic_dhcp
) {
1101 /* Create new binding */
1102 a
= calloc(1, sizeof(*a
) + clid_len
);
1104 a
->clid_len
= clid_len
;
1108 a
->assigned
= reqhint
;
1109 /* Set valid time to current time indicating */
1110 /* assignment is not having infinite lifetime */
1111 a
->valid_until
= now
;
1114 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
1116 odhcpd_urandom(a
->key
, sizeof(a
->key
));
1117 memcpy(a
->clid_data
, clid_data
, clid_len
);
1120 while (!(assigned
= assign_pd(iface
, a
)) &&
1121 !a
->managed_size
&& ++a
->length
<= 64);
1123 assigned
= assign_na(iface
, a
);
1125 if (a
->managed_size
&& !assigned
)
1130 if (!assigned
|| iface
->ia_addr_len
== 0)
1131 /* Set error status */
1132 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
1133 else if (assigned
&& !first
) {
1134 size_t handshake_len
= 4;
1136 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
1140 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1141 struct dhcpv6_auth_reconfigure auth
= {
1142 htons(DHCPV6_OPT_AUTH
),
1143 htons(sizeof(auth
) - 4),
1145 {htonl(time(NULL
)), htonl(++serial
)},
1149 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
1150 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
1151 handshake_len
+= sizeof(auth
);
1154 buf
+= handshake_len
;
1155 buflen
-= handshake_len
;
1156 response_len
+= handshake_len
;
1161 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1163 /* Was only a solicitation: mark binding for removal */
1164 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
1165 a
->flags
&= ~OAF_BOUND
;
1167 if (!(a
->flags
& OAF_STATIC
))
1168 a
->valid_until
= now
;
1169 } else if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1170 if (hostname_len
> 0) {
1171 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
1173 memcpy(a
->hostname
, hostname
, hostname_len
);
1174 a
->hostname
[hostname_len
] = 0;
1177 a
->accept_reconf
= accept_reconf
;
1178 a
->flags
|= OAF_BOUND
;
1179 apply_lease(iface
, a
, true);
1180 } else if (!assigned
&& a
&& a
->managed_size
== 0) {
1181 /* Cleanup failed assignment */
1182 free_dhcpv6_assignment(a
);
1185 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1186 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1187 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1188 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1189 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1190 status
= DHCPV6_STATUS_NOBINDING
;
1191 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1192 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1193 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1194 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1196 a
->flags
|= OAF_BOUND
;
1197 apply_lease(iface
, a
, true);
1199 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1200 if (!(a
->flags
& OAF_STATIC
))
1201 a
->valid_until
= now
- 1;
1203 if (a
->flags
& OAF_BOUND
) {
1204 apply_lease(iface
, a
, false);
1205 a
->flags
&= ~OAF_BOUND
;
1207 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128) {
1208 a
->flags
&= ~OAF_BOUND
;
1210 if (!(a
->flags
& OAF_STATIC
)) {
1212 a
->valid_until
= now
+ 3600; /* Block address for 1h */
1215 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
&& ia_addr_present
) {
1216 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1217 status
= DHCPV6_STATUS_NOTONLINK
;
1218 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1222 buf
+= ia_response_len
;
1223 buflen
-= ia_response_len
;
1224 response_len
+= ia_response_len
;
1225 dhcpv6_log(hdr
->msg_type
, iface
, now
, duidbuf
, is_pd
, a
, status
);
1228 if ((hdr
->msg_type
== DHCPV6_MSG_RELEASE
|| hdr
->msg_type
== DHCPV6_MSG_DECLINE
|| notonlink
) &&
1229 response_len
+ 6 < buflen
) {
1231 buf
[1] = DHCPV6_OPT_STATUS
;
1235 buf
[5] = (notonlink
) ? DHCPV6_STATUS_NOTONLINK
: DHCPV6_STATUS_OK
;
1239 dhcpv6_write_statefile();
1242 return response_len
;