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 size_t duid_len
= lease
->duid_len
? lease
->duid_len
: 14;
96 struct dhcpv6_assignment
*a
= calloc(1, sizeof(*a
) + duid_len
);
98 syslog(LOG_ERR
, "Calloc failed for static lease assignment on interface %s",
103 if (lease
->dhcpv4_leasetime
> 0)
104 a
->leasetime
= lease
->dhcpv4_leasetime
;
106 a
->clid_len
= duid_len
;
109 a
->assigned
= lease
->hostid
;
111 uint32_t i4a
= ntohl(lease
->ipaddr
.s_addr
) & 0xff;
112 a
->assigned
= ((i4a
/ 100) << 8) | (((i4a
% 100) / 10) << 4) | (i4a
% 10);
114 odhcpd_urandom(a
->key
, sizeof(a
->key
));
115 memcpy(a
->clid_data
, lease
->duid
, lease
->duid_len
);
116 memcpy(a
->mac
, lease
->mac
.ether_addr_octet
, sizeof(a
->mac
));
120 // Assign to all interfaces
121 struct dhcpv6_assignment
*c
;
122 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
123 if (c
->length
!= 128 || c
->assigned
> a
->assigned
) {
124 list_add_tail(&a
->head
, &c
->head
);
126 } else if (c
->assigned
== a
->assigned
) {
127 // Already an assignment with that number
133 if (lease
->hostname
[0]) {
135 a
->hostname
= strdup(lease
->hostname
);
147 static int send_reconf(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
150 struct dhcpv6_client_header hdr
;
154 uint16_t hardware_type
;
159 struct dhcpv6_auth_reconfigure auth
;
162 uint8_t clid_data
[128];
163 } __attribute__((packed
)) reconf_msg
= {
164 .hdr
= {DHCPV6_MSG_RECONFIGURE
, {0, 0, 0}},
165 .srvid_type
= htons(DHCPV6_OPT_SERVERID
),
166 .srvid_len
= htons(10),
167 .duid_type
= htons(3),
168 .hardware_type
= htons(1),
169 .msg_type
= htons(DHCPV6_OPT_RECONF_MSG
),
171 .msg_id
= DHCPV6_MSG_RENEW
,
172 .auth
= {htons(DHCPV6_OPT_AUTH
),
173 htons(sizeof(reconf_msg
.auth
) - 4), 3, 1, 0,
174 {htonl(time(NULL
)), htonl(++serial
)}, 2, {0}},
175 .clid_type
= htons(DHCPV6_OPT_CLIENTID
),
176 .clid_len
= htons(assign
->clid_len
),
180 odhcpd_get_mac(iface
, reconf_msg
.mac
);
181 memcpy(reconf_msg
.clid_data
, assign
->clid_data
, assign
->clid_len
);
182 struct iovec iov
= {&reconf_msg
, sizeof(reconf_msg
) - 128 + assign
->clid_len
};
185 uint8_t secretbytes
[64];
186 memset(secretbytes
, 0, sizeof(secretbytes
));
187 memcpy(secretbytes
, assign
->key
, sizeof(assign
->key
));
189 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
190 secretbytes
[i
] ^= 0x36;
193 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
194 md5_hash(iov
.iov_base
, iov
.iov_len
, &md5
);
195 md5_end(reconf_msg
.auth
.key
, &md5
);
197 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
198 secretbytes
[i
] ^= 0x36;
199 secretbytes
[i
] ^= 0x5c;
203 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
204 md5_hash(reconf_msg
.auth
.key
, 16, &md5
);
205 md5_end(reconf_msg
.auth
.key
, &md5
);
207 return odhcpd_send(iface
->dhcpv6_event
.uloop
.fd
, &assign
->peer
, &iov
, 1, iface
);
211 void dhcpv6_write_statefile(void)
216 if (config
.dhcp_statefile
) {
217 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
218 int fd
= open(config
.dhcp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
222 lockf(fd
, F_LOCK
, 0);
223 if (ftruncate(fd
, 0) < 0) {}
225 FILE *fp
= fdopen(fd
, "w");
231 struct interface
*iface
;
232 list_for_each_entry(iface
, &interfaces
, head
) {
233 if (iface
->dhcpv6
!= RELAYD_SERVER
&& iface
->dhcpv4
!= RELAYD_SERVER
)
236 if (iface
->dhcpv6
== RELAYD_SERVER
&& iface
->ia_assignments
.next
) {
237 struct dhcpv6_assignment
*c
;
238 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
239 if (c
->clid_len
== 0 || c
->managed_size
< 0)
242 char ipbuf
[INET6_ADDRSTRLEN
];
245 odhcpd_hexlify(duidbuf
, c
->clid_data
, c
->clid_len
);
247 // iface DUID iaid hostname lifetime assigned length [addrs...]
248 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s %x %s %ld %x %u ",
249 iface
->ifname
, duidbuf
, ntohl(c
->iaid
),
250 (c
->hostname
? c
->hostname
: "-"),
251 (c
->valid_until
> now
?
252 (c
->valid_until
- now
+ wall_time
) :
253 (INFINITE_VALID(c
->valid_until
) ? -1 : 0)),
254 c
->assigned
, (unsigned)c
->length
);
256 struct in6_addr addr
;
257 struct odhcpd_ipaddr
*addrs
= (c
->managed
) ? c
->managed
: iface
->ia_addr
;
258 size_t addrlen
= (c
->managed
) ? (size_t)c
->managed_size
: iface
->ia_addr_len
;
261 for (size_t i
= 0; i
< addrlen
; ++i
)
262 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
263 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
264 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
267 for (size_t i
= 0; i
< addrlen
; ++i
) {
268 if (addrs
[i
].prefix
> 96 || (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
<= now
) ||
269 (iface
->managed
< RELAYD_MANAGED_NO_AFLAG
&& i
!= m
&&
270 addrs
[i
].prefix
== 64))
273 addr
= addrs
[i
].addr
;
274 if (c
->length
== 128)
275 addr
.s6_addr32
[3] = htonl(c
->assigned
);
277 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
279 inet_ntop(AF_INET6
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
281 if (c
->length
== 128 && c
->hostname
) {
285 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
286 iface
->search
, b
, sizeof(b
)) > 0)
287 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
289 fprintf(fp
, "\t%s\n", c
->hostname
);
290 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
291 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
294 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/%d ", ipbuf
,
295 (c
->managed_size
) ? addrs
[i
].prefix
: c
->length
);
297 leasebuf
[l
- 1] = '\n';
298 fwrite(leasebuf
, 1, l
, fp
);
302 if (iface
->dhcpv4
== RELAYD_SERVER
&& iface
->dhcpv4_assignments
.next
) {
303 struct dhcpv4_assignment
*c
;
304 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
305 char ipbuf
[INET6_ADDRSTRLEN
];
308 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
310 // iface DUID iaid hostname lifetime assigned length [addrs...]
311 int l
= snprintf(leasebuf
, sizeof(leasebuf
), "# %s %s ipv4 %s %ld %x 32 ",
312 iface
->ifname
, duidbuf
,
313 (c
->hostname
? c
->hostname
: "-"),
314 (c
->valid_until
> now
?
315 (c
->valid_until
- now
+ wall_time
) :
316 (INFINITE_VALID(c
->valid_until
) ? -1 : 0)),
319 struct in_addr addr
= {htonl(c
->addr
)};
320 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
322 if (c
->hostname
[0]) {
326 if (dn_expand(iface
->search
, iface
->search
+ iface
->search_len
,
327 iface
->search
, b
, sizeof(b
)) > 0)
328 fprintf(fp
, "\t%s.%s", c
->hostname
, b
);
330 fprintf(fp
, "\t%s\n", c
->hostname
);
331 md5_hash(ipbuf
, strlen(ipbuf
), &md5
);
332 md5_hash(c
->hostname
, strlen(c
->hostname
), &md5
);
335 l
+= snprintf(leasebuf
+ l
, sizeof(leasebuf
) - l
, "%s/32 ", ipbuf
);
336 leasebuf
[l
- 1] = '\n';
337 fwrite(leasebuf
, 1, l
, fp
);
346 md5_end(newmd5
, &md5
);
348 if (config
.dhcp_cb
&& memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
349 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
350 char *argv
[2] = {config
.dhcp_cb
, NULL
};
352 execv(argv
[0], argv
);
359 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
361 if (a
->length
> 64 || a
->managed_size
< 0)
364 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
365 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
367 for (size_t i
= 0; i
< addrlen
; ++i
) {
368 struct in6_addr prefix
= addrs
[i
].addr
;
369 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
370 odhcpd_setup_route(&prefix
, (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
371 iface
, &a
->peer
.sin6_addr
, 1024, add
);
376 // More data was received from TCP connection
377 static void managed_handle_pd_data(struct ustream
*s
, _unused
int bytes_new
)
379 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
380 time_t now
= odhcpd_time();
381 bool first
= c
->managed_size
< 0;
385 char *data
= ustream_get_read_buf(s
, &pending
);
386 char *end
= memmem(data
, pending
, "\n\n", 2);
395 if (c
->accept_reconf
)
399 for (char *line
= strtok_r(data
, "\n", &saveptr
); line
; line
= strtok_r(NULL
, "\n", &saveptr
)) {
400 c
->managed
= realloc(c
->managed
, (c
->managed_size
+ 1) * sizeof(*c
->managed
));
401 struct odhcpd_ipaddr
*n
= &c
->managed
[c
->managed_size
];
403 char *saveptr2
, *x
= strtok_r(line
, "/", &saveptr2
);
404 if (!x
|| inet_pton(AF_INET6
, x
, &n
->addr
) < 1)
407 x
= strtok_r(NULL
, ",", &saveptr2
);
408 if (sscanf(x
, "%hhu", &n
->prefix
) < 1)
411 x
= strtok_r(NULL
, ",", &saveptr2
);
412 if (sscanf(x
, "%u", &n
->preferred
) < 1)
415 x
= strtok_r(NULL
, ",", &saveptr2
);
416 if (sscanf(x
, "%u", &n
->valid
) < 1)
419 if (n
->preferred
> n
->valid
)
422 if (UINT32_MAX
- now
< n
->preferred
)
423 n
->preferred
= UINT32_MAX
;
427 if (UINT32_MAX
- now
< n
->valid
)
428 n
->valid
= UINT32_MAX
;
437 ustream_consume(s
, end
- data
);
440 if (first
&& c
->managed_size
== 0)
441 free_dhcpv6_assignment(c
);
443 c
->valid_until
= now
+ 150;
447 // TCP transmission has ended, either because of success or timeout or other error
448 static void managed_handle_pd_done(struct ustream
*s
)
450 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
451 c
->valid_until
= odhcpd_time() + 15;
453 if (c
->accept_reconf
)
459 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
461 struct dhcpv6_assignment
*c
;
463 if (iface
->dhcpv6_pd_manager
[0]) {
464 int fd
= usock(USOCK_UNIX
| USOCK_TCP
, iface
->dhcpv6_pd_manager
, NULL
);
467 odhcpd_hexlify(iaidbuf
, assign
->clid_data
, assign
->clid_len
);
469 assign
->managed_sock
.stream
.notify_read
= managed_handle_pd_data
;
470 assign
->managed_sock
.stream
.notify_state
= managed_handle_pd_done
;
471 ustream_fd_init(&assign
->managed_sock
, fd
);
472 ustream_printf(&assign
->managed_sock
.stream
, "%s,%x\n::/%d,0,0\n\n",
473 iaidbuf
, assign
->iaid
, assign
->length
);
474 ustream_write_pending(&assign
->managed_sock
.stream
);
475 assign
->managed_size
= -1;
476 assign
->valid_until
= odhcpd_time() + 15;
477 list_add(&assign
->head
, &iface
->ia_assignments
);
479 // Wait initial period of up to 250ms for immediate assignment
480 struct pollfd pfd
= { .fd
= fd
, .events
= POLLIN
};
482 managed_handle_pd_data(&assign
->managed_sock
.stream
, 0);
484 if (fcntl(fd
, F_GETFL
) >= 0 && assign
->managed_size
> 0)
489 } else if (iface
->ia_addr_len
< 1) {
493 // Try honoring the hint first
494 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
495 if (assign
->assigned
) {
496 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
497 if (c
->length
== 128 || c
->length
== 0)
500 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
501 list_add_tail(&assign
->head
, &c
->head
);
502 apply_lease(iface
, assign
, true);
506 if (c
->assigned
!= 0)
507 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
511 // Fallback to a variable assignment
513 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
514 if (c
->length
== 128 || c
->length
== 0)
517 current
= (current
+ asize
) & (~asize
);
518 if (current
+ asize
< c
->assigned
) {
519 assign
->assigned
= current
;
520 list_add_tail(&assign
->head
, &c
->head
);
521 apply_lease(iface
, assign
, true);
525 if (c
->assigned
!= 0)
526 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
533 static bool assign_na(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
535 // Seed RNG with checksum of DUID
537 for (size_t i
= 0; i
< assign
->clid_len
; ++i
)
538 seed
+= assign
->clid_data
[i
];
541 // Try to assign up to 100x
542 for (size_t i
= 0; i
< 100; ++i
) {
544 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
546 struct dhcpv6_assignment
*c
;
547 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
551 if (c
->assigned
> try || c
->length
!= 128) {
552 assign
->assigned
= try;
553 list_add_tail(&assign
->head
, &c
->head
);
555 } else if (c
->assigned
== try) {
564 void dhcpv6_ia_preupdate(struct interface
*iface
)
566 if (iface
->dhcpv6
!= RELAYD_SERVER
)
569 struct dhcpv6_assignment
*c
, *border
= list_last_entry(
570 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
571 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
572 if (c
!= border
&& !iface
->managed
)
573 apply_lease(iface
, c
, false);
576 void dhcpv6_ia_postupdate(struct interface
*iface
, time_t now
)
578 if (iface
->dhcpv6
!= RELAYD_SERVER
)
582 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
583 if (iface
->ia_addr
[i
].preferred
> (uint32_t)now
&&
584 iface
->ia_addr
[i
].prefix
< 64 &&
585 iface
->ia_addr
[i
].prefix
> minprefix
)
586 minprefix
= iface
->ia_addr
[i
].prefix
;
589 struct dhcpv6_assignment
*border
= list_last_entry(
590 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
591 if (minprefix
> 32 && minprefix
<= 64)
592 border
->assigned
= 1U << (64 - minprefix
);
594 border
->assigned
= 0;
596 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
597 struct dhcpv6_assignment
*c
, *d
;
598 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
599 if (c
->clid_len
== 0 || (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
< now
) ||
603 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
604 list_move(&c
->head
, &reassign
);
605 else if (c
!= border
)
606 apply_lease(iface
, c
, true);
608 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
610 c
->reconf_sent
= now
;
611 send_reconf(iface
, c
);
613 // Leave all other assignments of that client alone
614 struct dhcpv6_assignment
*a
;
615 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
616 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
617 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
618 c
->reconf_cnt
= INT_MAX
;
622 while (!list_empty(&reassign
)) {
623 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
625 if (!assign_pd(iface
, c
)) {
627 list_add(&c
->head
, &iface
->ia_assignments
);
631 dhcpv6_write_statefile();
635 static void reconf_timer(struct uloop_timeout
*event
)
637 time_t now
= odhcpd_time();
638 struct interface
*iface
;
639 list_for_each_entry(iface
, &interfaces
, head
) {
640 if (iface
->dhcpv6
!= RELAYD_SERVER
|| iface
->ia_assignments
.next
== NULL
)
643 struct dhcpv6_assignment
*a
, *n
;
644 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
645 if (!INFINITE_VALID(a
->valid_until
) && a
->valid_until
< now
) {
646 if ((a
->length
< 128 && a
->clid_len
> 0) ||
647 (a
->length
== 128 && a
->clid_len
== 0)) {
649 free_dhcpv6_assignment(a
);
651 } else if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< 8 &&
652 now
> a
->reconf_sent
+ (1 << a
->reconf_cnt
)) {
654 a
->reconf_sent
= now
;
655 send_reconf(iface
, a
);
659 uloop_timeout_set(event
, 2000);
663 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
664 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
665 struct interface
*iface
, bool request
)
667 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
670 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
671 size_t datalen
= sizeof(out
);
672 time_t now
= odhcpd_time();
675 struct __attribute__((packed
)) {
679 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
682 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
683 datalen
+= sizeof(stat
);
687 if (a
->leasetime
> 0) {
688 leasetime
= a
->leasetime
;
690 leasetime
= iface
->dhcpv4_leasetime
;
694 else if (leasetime
< 60)
697 uint32_t pref
= leasetime
;
698 uint32_t valid
= leasetime
;
700 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
701 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
704 for (size_t i
= 0; i
< addrlen
; ++i
)
705 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
706 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
707 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
710 for (size_t i
= 0; i
< addrlen
; ++i
) {
711 uint32_t prefix_pref
= addrs
[i
].preferred
;
712 uint32_t prefix_valid
= addrs
[i
].valid
;
714 if (addrs
[i
].prefix
> 96 ||
715 addrs
[i
].preferred
<= (uint32_t)now
)
718 if (prefix_pref
!= UINT32_MAX
)
721 if (prefix_valid
!= UINT32_MAX
)
724 if (a
->length
< 128) {
725 struct dhcpv6_ia_prefix p
= {
726 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
727 .len
= htons(sizeof(p
) - 4),
728 .preferred
= htonl(prefix_pref
),
729 .valid
= htonl(prefix_valid
),
730 .prefix
= (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
731 .addr
= addrs
[i
].addr
733 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
735 size_t entrlen
= sizeof(p
) - 4;
737 if (datalen
+ entrlen
+ 4 > buflen
||
738 (a
->assigned
== 0 && a
->managed_size
== 0) ||
739 (!a
->managed_size
&& a
->length
<= addrs
[i
].prefix
))
742 memcpy(buf
+ datalen
, &p
, sizeof(p
));
743 datalen
+= entrlen
+ 4;
745 struct dhcpv6_ia_addr n
= {
746 .type
= htons(DHCPV6_OPT_IA_ADDR
),
747 .len
= htons(sizeof(n
) - 4),
748 .addr
= addrs
[i
].addr
,
749 .preferred
= htonl(prefix_pref
),
750 .valid
= htonl(prefix_valid
)
752 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
753 size_t entrlen
= sizeof(n
) - 4;
755 if (iface
->managed
< RELAYD_MANAGED_NO_AFLAG
&& i
!= m
&&
756 addrs
[i
].prefix
<= 64)
759 if (datalen
+ entrlen
+ 4 > buflen
|| a
->assigned
== 0)
762 memcpy(buf
+ datalen
, &n
, sizeof(n
));
763 datalen
+= entrlen
+ 4;
766 // Calculate T1 / T2 based on non-deprecated addresses
767 if (prefix_pref
> 0) {
768 if (prefix_pref
< pref
)
771 if (prefix_valid
< valid
)
772 valid
= prefix_valid
;
776 if (!INFINITE_VALID(a
->valid_until
))
777 /* UINT32_MAX is considered as infinite leasetime */
778 a
->valid_until
= (valid
== UINT32_MAX
) ? 0 : valid
+ now
;
780 out
.t1
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 5 / 10);
781 out
.t2
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 8 / 10);
791 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
792 uint16_t otype
, olen
;
793 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
794 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
795 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
796 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
797 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
802 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
803 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
805 for (size_t i
= 0; i
< addrlen
; ++i
) {
806 if (addrs
[i
].prefix
> 96 ||
807 addrs
[i
].preferred
<= (uint32_t)now
)
810 struct in6_addr addr
= addrs
[i
].addr
;
811 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
812 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
814 if (!memcmp(&p
->addr
, &addr
, sizeof(addr
)) &&
815 p
->prefix
== ((a
->managed
) ? addrs
[i
].prefix
: a
->length
))
818 addr
.s6_addr32
[3] = htonl(a
->assigned
);
820 if (!memcmp(&n
->addr
, &addr
, sizeof(addr
)))
827 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
828 struct dhcpv6_ia_prefix inv
= {
829 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
830 .len
= htons(sizeof(inv
) - 4),
837 if (datalen
+ sizeof(inv
) > buflen
)
840 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
841 datalen
+= sizeof(inv
);
843 struct dhcpv6_ia_addr inv
= {
844 .type
= htons(DHCPV6_OPT_IA_ADDR
),
845 .len
= htons(sizeof(inv
) - 4),
851 if (datalen
+ sizeof(inv
) > buflen
)
854 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
855 datalen
+= sizeof(inv
);
862 out
.len
= htons(datalen
- 4);
863 memcpy(buf
, &out
, sizeof(out
));
868 static void dhcpv6_log(uint8_t msgtype
, struct interface
*iface
, time_t now
,
869 const char *duidbuf
, bool is_pd
, struct dhcpv6_assignment
*a
, int code
)
871 const char *type
= "UNKNOWN";
872 const char *status
= "UNKNOWN";
874 if (msgtype
== DHCPV6_MSG_RENEW
)
878 case DHCPV6_MSG_SOLICIT
:
881 case DHCPV6_MSG_REQUEST
:
884 case DHCPV6_MSG_CONFIRM
:
887 case DHCPV6_MSG_RENEW
:
890 case DHCPV6_MSG_REBIND
:
893 case DHCPV6_MSG_RELEASE
:
896 case DHCPV6_MSG_DECLINE
:
902 case DHCPV6_STATUS_OK
:
905 case DHCPV6_STATUS_NOADDRSAVAIL
:
906 status
= "no addresses available";
908 case DHCPV6_STATUS_NOBINDING
:
909 status
= "no binding";
911 case DHCPV6_STATUS_NOTONLINK
:
912 status
= "not on-link";
914 case DHCPV6_STATUS_NOPREFIXAVAIL
:
915 status
= "no prefix available";
919 char leasebuf
[256] = "";
922 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
923 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
925 char addrbuf
[INET6_ADDRSTRLEN
];
927 for (size_t i
= 0; i
< addrlen
; ++i
) {
928 if (addrs
[i
].prefix
> 96 || addrs
[i
].preferred
<= (uint32_t)now
)
931 struct in6_addr addr
= addrs
[i
].addr
;
932 int prefix
= a
->managed
? addrs
[i
].prefix
: a
->length
;
934 addr
.s6_addr32
[3] = htonl(a
->assigned
);
936 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
938 inet_ntop(AF_INET6
, &addr
, addrbuf
, sizeof(addrbuf
));
939 lbsize
+= snprintf(leasebuf
+ lbsize
, sizeof(leasebuf
) - lbsize
, "%s/%d ", addrbuf
, prefix
);
943 syslog(LOG_WARNING
, "DHCPV6 %s %s from %s on %s: %s %s", type
, (is_pd
) ? "IA_PD" : "IA_NA",
944 duidbuf
, iface
->ifname
, status
, leasebuf
);
949 ssize_t
dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
950 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
952 time_t now
= odhcpd_time();
953 size_t response_len
= 0;
954 const struct dhcpv6_client_header
*hdr
= data
;
955 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
956 uint16_t otype
, olen
;
958 // Find and parse client-id and hostname
959 bool accept_reconf
= false;
960 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
962 size_t hostname_len
= 0;
963 bool notonlink
= false;
966 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
967 if (otype
== DHCPV6_OPT_CLIENTID
) {
971 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
972 memcpy(mac
, &odata
[8], sizeof(mac
));
973 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
974 memcpy(mac
, &odata
[4], sizeof(mac
));
977 odhcpd_hexlify(duidbuf
, odata
, olen
);
978 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
979 uint8_t fqdn_buf
[256];
980 memcpy(fqdn_buf
, odata
, olen
);
981 fqdn_buf
[olen
++] = 0;
983 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
984 hostname_len
= strcspn(hostname
, ".");
985 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
986 accept_reconf
= true;
990 if (!clid_data
|| !clid_len
|| clid_len
> 130)
993 struct dhcpv6_assignment
*first
= NULL
;
994 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
995 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
996 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
997 bool ia_addr_present
= false;
998 if (!is_pd
&& !is_na
)
1001 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
1002 size_t ia_response_len
= 0;
1003 uint8_t reqlen
= (is_pd
) ? 62 : 128;
1004 uint32_t reqhint
= 0;
1006 // Parse request hint for IA-PD
1009 uint16_t stype
, slen
;
1010 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1011 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
1014 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
1017 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
1018 if (reqlen
> 32 && reqlen
<= 64)
1019 reqhint
&= (1U << (64 - reqlen
)) - 1;
1027 uint16_t stype
, slen
;
1028 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1029 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
1032 ia_addr_present
= true;
1037 struct dhcpv6_assignment
*c
, *a
= NULL
;
1038 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
1039 if (((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) ||
1040 (c
->clid_len
>= clid_len
&& !c
->clid_data
[0] && !c
->clid_data
[1]
1041 && !memcmp(c
->mac
, mac
, sizeof(mac
)))) &&
1042 (c
->iaid
== ia
->iaid
|| INFINITE_VALID(c
->valid_until
) || now
< c
->valid_until
) &&
1043 ((is_pd
&& c
->length
<= 64) || (is_na
&& c
->length
== 128))) {
1047 apply_lease(iface
, a
, false);
1048 memcpy(a
->clid_data
, clid_data
, clid_len
);
1049 a
->clid_len
= clid_len
;
1058 // Generic message handling
1059 uint16_t status
= DHCPV6_STATUS_OK
;
1060 if (a
&& a
->managed_size
< 0) {
1062 } else if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
|| hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1063 bool assigned
= !!a
;
1065 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
1066 a
= calloc(1, sizeof(*a
) + clid_len
);
1068 a
->clid_len
= clid_len
;
1072 a
->assigned
= reqhint
;
1073 // Set valid time to current time indicating
1074 // assignment is not having infinite lifetime
1075 a
->valid_until
= now
;
1078 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
1080 odhcpd_urandom(a
->key
, sizeof(a
->key
));
1081 memcpy(a
->clid_data
, clid_data
, clid_len
);
1084 while (!(assigned
= assign_pd(iface
, a
)) &&
1085 !a
->managed_size
&& ++a
->length
<= 64);
1087 assigned
= assign_na(iface
, a
);
1089 if (a
->managed_size
&& !assigned
)
1094 if (!assigned
|| iface
->ia_addr_len
== 0) { // Set error status
1095 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
1096 } else if (assigned
&& !first
) { //
1097 size_t handshake_len
= 4;
1099 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
1103 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1104 struct dhcpv6_auth_reconfigure auth
= {
1105 htons(DHCPV6_OPT_AUTH
),
1106 htons(sizeof(auth
) - 4),
1108 {htonl(time(NULL
)), htonl(++serial
)},
1112 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
1113 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
1114 handshake_len
+= sizeof(auth
);
1117 buf
+= handshake_len
;
1118 buflen
-= handshake_len
;
1119 response_len
+= handshake_len
;
1124 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1126 // Was only a solicitation: mark binding for removal
1127 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
1128 if (!INFINITE_VALID(a
->valid_until
))
1129 a
->valid_until
= now
;
1130 } else if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1131 if (hostname_len
> 0) {
1132 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
1134 memcpy(a
->hostname
, hostname
, hostname_len
);
1135 a
->hostname
[hostname_len
] = 0;
1138 a
->accept_reconf
= accept_reconf
;
1139 apply_lease(iface
, a
, true);
1140 } else if (!assigned
&& a
&& a
->managed_size
== 0) { // Cleanup failed assignment
1141 free_dhcpv6_assignment(a
);
1143 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1144 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1145 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1146 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1147 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1148 status
= DHCPV6_STATUS_NOBINDING
;
1149 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1150 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1151 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1152 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1154 apply_lease(iface
, a
, true);
1155 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1156 if (!INFINITE_VALID(a
->valid_until
))
1157 a
->valid_until
= now
- 1;
1159 apply_lease(iface
, a
, false);
1160 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128 &&
1161 !INFINITE_VALID(a
->valid_until
)) {
1163 a
->valid_until
= now
+ 3600; // Block address for 1h
1165 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
&& ia_addr_present
) {
1166 // Send NOTONLINK for CONFIRM with addr present so that clients restart connection
1167 status
= DHCPV6_STATUS_NOTONLINK
;
1168 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1172 buf
+= ia_response_len
;
1173 buflen
-= ia_response_len
;
1174 response_len
+= ia_response_len
;
1175 dhcpv6_log(hdr
->msg_type
, iface
, now
, duidbuf
, is_pd
, a
, status
);
1178 if ((hdr
->msg_type
== DHCPV6_MSG_RELEASE
|| hdr
->msg_type
== DHCPV6_MSG_DECLINE
|| notonlink
) &&
1179 response_len
+ 6 < buflen
) {
1181 buf
[1] = DHCPV6_OPT_STATUS
;
1185 buf
[5] = (notonlink
) ? DHCPV6_STATUS_NOTONLINK
: DHCPV6_STATUS_OK
;
1189 dhcpv6_write_statefile();
1192 return response_len
;