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.
32 #include <arpa/inet.h>
33 #include <sys/timerfd.h>
35 #include <libubox/md5.h>
36 #include <libubox/usock.h>
38 #define ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) \
39 ((iface)->dhcpv6_assignall || (i) == (m) || \
40 (addrs)[(i)].prefix > 64)
42 static void dhcpv6_netevent_cb(unsigned long event
, struct netevent_handler_info
*info
);
43 static void free_dhcpv6_assignment(struct dhcpv6_assignment
*c
);
44 static void handle_addrlist_change(struct netevent_handler_info
*info
);
45 static void start_reconf(struct dhcpv6_assignment
*a
);
46 static void stop_reconf(struct dhcpv6_assignment
*a
);
47 static void valid_until_cb(struct uloop_timeout
*event
);
49 static struct netevent_handler dhcpv6_netevent_handler
= { .cb
= dhcpv6_netevent_cb
, };
50 static struct uloop_timeout valid_until_timeout
= {.cb
= valid_until_cb
};
51 static uint32_t serial
= 0;
52 static uint8_t statemd5
[16];
54 int dhcpv6_ia_init(void)
56 uloop_timeout_set(&valid_until_timeout
, 1000);
58 netlink_add_netevent_handler(&dhcpv6_netevent_handler
);
63 int dhcpv6_setup_ia_interface(struct interface
*iface
, bool enable
)
65 if (!enable
&& iface
->ia_assignments
.next
) {
66 struct dhcpv6_assignment
*c
;
68 while (!list_empty(&iface
->ia_assignments
)) {
69 c
= list_first_entry(&iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
70 free_dhcpv6_assignment(c
);
74 if (enable
&& iface
->dhcpv6
== MODE_SERVER
) {
75 if (!iface
->ia_assignments
.next
)
76 INIT_LIST_HEAD(&iface
->ia_assignments
);
78 if (list_empty(&iface
->ia_assignments
)) {
79 struct dhcpv6_assignment
*border
= calloc(1, sizeof(*border
));
81 syslog(LOG_ERR
, "Calloc failed for border on interface %s", iface
->ifname
);
86 list_add(&border
->head
, &iface
->ia_assignments
);
89 /* Parse static entries */
91 list_for_each_entry(lease
, &leases
, head
) {
93 size_t duid_len
= lease
->duid_len
? lease
->duid_len
: 14;
94 struct dhcpv6_assignment
*a
= calloc(1, sizeof(*a
) + duid_len
);
96 syslog(LOG_ERR
, "Calloc failed for static lease assignment on interface %s",
101 a
->leasetime
= lease
->dhcpv4_leasetime
;
103 a
->clid_len
= duid_len
;
106 a
->assigned
= lease
->hostid
;
108 uint32_t i4a
= ntohl(lease
->ipaddr
.s_addr
) & 0xff;
109 a
->assigned
= ((i4a
/ 100) << 8) | (((i4a
% 100) / 10) << 4) | (i4a
% 10);
112 odhcpd_urandom(a
->key
, sizeof(a
->key
));
113 memcpy(a
->clid_data
, lease
->duid
, lease
->duid_len
);
114 memcpy(a
->mac
, lease
->mac
.ether_addr_octet
, sizeof(a
->mac
));
115 /* Static assignment */
116 a
->flags
|= OAF_STATIC
;
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
);
138 free_dhcpv6_assignment(a
);
145 static void dhcpv6_netevent_cb(unsigned long event
, struct netevent_handler_info
*info
)
147 struct interface
*iface
= info
->iface
;
149 if (!iface
|| iface
->dhcpv6
!= MODE_SERVER
)
153 case NETEV_ADDR6LIST_CHANGE
:
154 handle_addrlist_change(info
);
162 static void free_dhcpv6_assignment(struct dhcpv6_assignment
*c
)
164 if (c
->managed_sock
.fd
.registered
) {
165 ustream_free(&c
->managed_sock
.stream
);
166 close(c
->managed_sock
.fd
.fd
);
180 static inline bool valid_prefix_length(const struct dhcpv6_assignment
*a
, const uint8_t prefix_length
)
182 return (a
->managed_size
|| a
->length
> prefix_length
);
185 static inline bool valid_addr(const struct odhcpd_ipaddr
*addr
, time_t now
)
187 return (addr
->prefix
<= 96 && addr
->preferred
> (uint32_t)now
);
190 static size_t get_preferred_addr(const struct odhcpd_ipaddr
*addrs
, const size_t addrlen
)
194 for (i
= 0, m
= 0; i
< addrlen
; ++i
) {
195 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
196 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
197 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
204 static int send_reconf(struct dhcpv6_assignment
*assign
)
207 struct dhcpv6_client_header hdr
;
211 uint16_t hardware_type
;
216 struct dhcpv6_auth_reconfigure auth
;
219 uint8_t clid_data
[128];
220 } __attribute__((packed
)) reconf_msg
= {
221 .hdr
= {DHCPV6_MSG_RECONFIGURE
, {0, 0, 0}},
222 .srvid_type
= htons(DHCPV6_OPT_SERVERID
),
223 .srvid_len
= htons(10),
224 .duid_type
= htons(3),
225 .hardware_type
= htons(1),
226 .msg_type
= htons(DHCPV6_OPT_RECONF_MSG
),
228 .msg_id
= DHCPV6_MSG_RENEW
,
229 .auth
= {htons(DHCPV6_OPT_AUTH
),
230 htons(sizeof(reconf_msg
.auth
) - 4), 3, 1, 0,
231 {htonl(time(NULL
)), htonl(++serial
)}, 2, {0}},
232 .clid_type
= htons(DHCPV6_OPT_CLIENTID
),
233 .clid_len
= htons(assign
->clid_len
),
236 struct interface
*iface
= assign
->iface
;
238 odhcpd_get_mac(iface
, reconf_msg
.mac
);
239 memcpy(reconf_msg
.clid_data
, assign
->clid_data
, assign
->clid_len
);
240 struct iovec iov
= {&reconf_msg
, sizeof(reconf_msg
) - 128 + assign
->clid_len
};
243 uint8_t secretbytes
[64];
244 memset(secretbytes
, 0, sizeof(secretbytes
));
245 memcpy(secretbytes
, assign
->key
, sizeof(assign
->key
));
247 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
248 secretbytes
[i
] ^= 0x36;
251 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
252 md5_hash(iov
.iov_base
, iov
.iov_len
, &md5
);
253 md5_end(reconf_msg
.auth
.key
, &md5
);
255 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
256 secretbytes
[i
] ^= 0x36;
257 secretbytes
[i
] ^= 0x5c;
261 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
262 md5_hash(reconf_msg
.auth
.key
, 16, &md5
);
263 md5_end(reconf_msg
.auth
.key
, &md5
);
265 return odhcpd_send(iface
->dhcpv6_event
.uloop
.fd
, &assign
->peer
, &iov
, 1, iface
);
268 void dhcpv6_enum_ia_addrs(struct interface
*iface
, struct dhcpv6_assignment
*c
,
269 time_t now
, dhcpv6_binding_cb_handler_t func
, void *arg
)
271 struct odhcpd_ipaddr
*addrs
= (c
->managed
) ? c
->managed
: iface
->addr6
;
272 size_t addrlen
= (c
->managed
) ? (size_t)c
->managed_size
: iface
->addr6_len
;
273 size_t m
= get_preferred_addr(addrs
, addrlen
);
275 for (size_t i
= 0; i
< addrlen
; ++i
) {
276 struct in6_addr addr
;
277 uint32_t pref
, valid
;
278 int prefix
= c
->managed
? addrs
[i
].prefix
: c
->length
;
280 if (!valid_addr(&addrs
[i
], now
))
283 addr
= addrs
[i
].addr
.in6
;
284 pref
= addrs
[i
].preferred
;
285 valid
= addrs
[i
].valid
;
287 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
))
290 addr
.s6_addr32
[3] = htonl(c
->assigned
);
292 if (!valid_prefix_length(c
, addrs
[i
].prefix
))
295 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
296 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
299 if (pref
!= UINT32_MAX
)
302 if (valid
!= UINT32_MAX
)
305 func(&addr
, prefix
, pref
, valid
, arg
);
312 struct dhcpv6_assignment
*c
;
313 struct interface
*iface
;
319 void dhcpv6_write_ia_addr(struct in6_addr
*addr
, int prefix
, _unused
uint32_t pref
,
320 _unused
uint32_t valid
, void *arg
)
322 struct write_ctxt
*ctxt
= (struct write_ctxt
*)arg
;
323 char ipbuf
[INET6_ADDRSTRLEN
];
325 inet_ntop(AF_INET6
, addr
, ipbuf
, sizeof(ipbuf
) - 1);
327 if (ctxt
->c
->length
== 128 && ctxt
->c
->hostname
) {
328 fputs(ipbuf
, ctxt
->fp
);
331 if (dn_expand(ctxt
->iface
->search
, ctxt
->iface
->search
+ ctxt
->iface
->search_len
,
332 ctxt
->iface
->search
, b
, sizeof(b
)) > 0)
333 fprintf(ctxt
->fp
, "\t%s.%s", ctxt
->c
->hostname
, b
);
335 fprintf(ctxt
->fp
, "\t%s\n", ctxt
->c
->hostname
);
336 md5_hash(ipbuf
, strlen(ipbuf
), &ctxt
->md5
);
337 md5_hash(ctxt
->c
->hostname
, strlen(ctxt
->c
->hostname
), &ctxt
->md5
);
340 ctxt
->buf_idx
+= snprintf(ctxt
->buf
+ ctxt
->buf_idx
,ctxt
->buf_len
- ctxt
->buf_idx
,
341 "%s/%d ", ipbuf
, prefix
);
344 void dhcpv6_write_statefile(void)
346 struct write_ctxt ctxt
;
348 md5_begin(&ctxt
.md5
);
350 if (config
.dhcp_statefile
) {
351 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
352 int fd
= open(config
.dhcp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
358 ret
= lockf(fd
, F_LOCK
, 0);
363 if (ftruncate(fd
, 0) < 0) {}
365 ctxt
.fp
= fdopen(fd
, "w");
372 ctxt
.buf_len
= sizeof(leasebuf
);
374 list_for_each_entry(ctxt
.iface
, &interfaces
, head
) {
375 if (ctxt
.iface
->dhcpv6
!= MODE_SERVER
&&
376 ctxt
.iface
->dhcpv4
!= MODE_SERVER
)
379 if (ctxt
.iface
->dhcpv6
== MODE_SERVER
&&
380 ctxt
.iface
->ia_assignments
.next
) {
381 list_for_each_entry(ctxt
.c
, &ctxt
.iface
->ia_assignments
, head
) {
382 if (!(ctxt
.c
->flags
& OAF_BOUND
) || ctxt
.c
->managed_size
< 0)
387 odhcpd_hexlify(duidbuf
, ctxt
.c
->clid_data
, ctxt
.c
->clid_len
);
389 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
390 ctxt
.buf_idx
= snprintf(ctxt
.buf
, ctxt
.buf_len
, "# %s %s %x %s %ld %x %u ",
391 ctxt
.iface
->ifname
, duidbuf
, ntohl(ctxt
.c
->iaid
),
392 (ctxt
.c
->hostname
? ctxt
.c
->hostname
: "-"),
393 (ctxt
.c
->valid_until
> now
?
394 (ctxt
.c
->valid_until
- now
+ wall_time
) :
395 (INFINITE_VALID(ctxt
.c
->valid_until
) ? -1 : 0)),
396 ctxt
.c
->assigned
, (unsigned)ctxt
.c
->length
);
398 if (INFINITE_VALID(ctxt
.c
->valid_until
) || ctxt
.c
->valid_until
> now
)
399 dhcpv6_enum_ia_addrs(ctxt
.iface
, ctxt
.c
, now
,
400 dhcpv6_write_ia_addr
, &ctxt
);
402 ctxt
.buf
[ctxt
.buf_idx
- 1] = '\n';
403 fwrite(ctxt
.buf
, 1, ctxt
.buf_idx
, ctxt
.fp
);
407 if (ctxt
.iface
->dhcpv4
== MODE_SERVER
&&
408 ctxt
.iface
->dhcpv4_assignments
.next
) {
409 struct dhcpv4_assignment
*c
;
410 list_for_each_entry(c
, &ctxt
.iface
->dhcpv4_assignments
, head
) {
411 if (!(c
->flags
& OAF_BOUND
))
414 char ipbuf
[INET6_ADDRSTRLEN
];
416 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
418 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
419 ctxt
.buf_idx
= snprintf(ctxt
.buf
, ctxt
.buf_len
, "# %s %s ipv4 %s %ld %x 32 ",
420 ctxt
.iface
->ifname
, duidbuf
,
421 (c
->hostname
? c
->hostname
: "-"),
422 (c
->valid_until
> now
?
423 (c
->valid_until
- now
+ wall_time
) :
424 (INFINITE_VALID(c
->valid_until
) ? -1 : 0)),
427 struct in_addr addr
= {.s_addr
= c
->addr
};
428 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
431 fputs(ipbuf
, ctxt
.fp
);
434 if (dn_expand(ctxt
.iface
->search
,
435 ctxt
.iface
->search
+ ctxt
.iface
->search_len
,
436 ctxt
.iface
->search
, b
, sizeof(b
)) > 0)
437 fprintf(ctxt
.fp
, "\t%s.%s", c
->hostname
, b
);
439 fprintf(ctxt
.fp
, "\t%s\n", c
->hostname
);
440 md5_hash(ipbuf
, strlen(ipbuf
), &ctxt
.md5
);
441 md5_hash(c
->hostname
, strlen(c
->hostname
), &ctxt
.md5
);
444 ctxt
.buf_idx
+= snprintf(ctxt
.buf
+ ctxt
.buf_idx
,
445 ctxt
.buf_len
- ctxt
.buf_idx
,
447 ctxt
.buf
[ctxt
.buf_idx
- 1] = '\n';
448 fwrite(ctxt
.buf
, 1, ctxt
.buf_idx
, ctxt
.fp
);
457 md5_end(newmd5
, &ctxt
.md5
);
459 if (config
.dhcp_cb
&& memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
460 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
461 char *argv
[2] = {config
.dhcp_cb
, NULL
};
463 execv(argv
[0], argv
);
469 static void __apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
,
470 struct odhcpd_ipaddr
*addrs
, ssize_t addr_len
, bool add
)
475 for (ssize_t i
= 0; i
< addr_len
; ++i
) {
476 struct in6_addr prefix
= addrs
[i
].addr
.in6
;
477 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
478 prefix
.s6_addr32
[2] = prefix
.s6_addr32
[3] = 0;
479 netlink_setup_route(&prefix
, (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
480 iface
->ifindex
, &a
->peer
.sin6_addr
, 1024, add
);
484 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
486 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->addr6
;
487 ssize_t addrlen
= (a
->managed
) ? a
->managed_size
: (ssize_t
)iface
->addr6_len
;
489 __apply_lease(iface
, a
, addrs
, addrlen
, add
);
492 /* More data was received from TCP connection */
493 static void managed_handle_pd_data(struct ustream
*s
, _unused
int bytes_new
)
495 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
496 time_t now
= odhcpd_time();
497 bool first
= c
->managed_size
< 0;
501 char *data
= ustream_get_read_buf(s
, &pending
);
502 char *end
= memmem(data
, pending
, "\n\n", 2);
511 if (c
->accept_reconf
)
515 for (char *line
= strtok_r(data
, "\n", &saveptr
); line
; line
= strtok_r(NULL
, "\n", &saveptr
)) {
516 c
->managed
= realloc(c
->managed
, (c
->managed_size
+ 1) * sizeof(*c
->managed
));
517 struct odhcpd_ipaddr
*n
= &c
->managed
[c
->managed_size
];
519 char *saveptr2
, *x
= strtok_r(line
, "/", &saveptr2
);
520 if (!x
|| inet_pton(AF_INET6
, x
, &n
->addr
) < 1)
523 x
= strtok_r(NULL
, ",", &saveptr2
);
524 if (sscanf(x
, "%hhu", &n
->prefix
) < 1)
527 x
= strtok_r(NULL
, ",", &saveptr2
);
528 if (sscanf(x
, "%u", &n
->preferred
) < 1)
531 x
= strtok_r(NULL
, ",", &saveptr2
);
532 if (sscanf(x
, "%u", &n
->valid
) < 1)
535 if (n
->preferred
> n
->valid
)
538 if (UINT32_MAX
- now
< n
->preferred
)
539 n
->preferred
= UINT32_MAX
;
543 if (UINT32_MAX
- now
< n
->valid
)
544 n
->valid
= UINT32_MAX
;
553 ustream_consume(s
, end
- data
);
556 if (first
&& c
->managed_size
== 0)
557 free_dhcpv6_assignment(c
);
558 else if (first
&& !(c
->flags
& OAF_STATIC
))
559 c
->valid_until
= now
+ 150;
563 /* TCP transmission has ended, either because of success or timeout or other error */
564 static void managed_handle_pd_done(struct ustream
*s
)
566 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
568 if (!(c
->flags
& OAF_STATIC
))
569 c
->valid_until
= odhcpd_time() + 15;
573 if (c
->accept_reconf
)
577 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
579 struct dhcpv6_assignment
*c
;
581 if (iface
->dhcpv6_pd_manager
[0]) {
582 int fd
= usock(USOCK_UNIX
| USOCK_TCP
, iface
->dhcpv6_pd_manager
, NULL
);
585 odhcpd_hexlify(iaidbuf
, assign
->clid_data
, assign
->clid_len
);
587 assign
->managed_sock
.stream
.notify_read
= managed_handle_pd_data
;
588 assign
->managed_sock
.stream
.notify_state
= managed_handle_pd_done
;
589 ustream_fd_init(&assign
->managed_sock
, fd
);
590 ustream_printf(&assign
->managed_sock
.stream
, "%s,%x\n::/%d,0,0\n\n",
591 iaidbuf
, assign
->iaid
, assign
->length
);
592 ustream_write_pending(&assign
->managed_sock
.stream
);
593 assign
->managed_size
= -1;
595 if (!(assign
->flags
& OAF_STATIC
))
596 assign
->valid_until
= odhcpd_time() + 15;
598 list_add(&assign
->head
, &iface
->ia_assignments
);
600 /* Wait initial period of up to 250ms for immediate assignment */
601 struct pollfd pfd
= { .fd
= fd
, .events
= POLLIN
};
603 managed_handle_pd_data(&assign
->managed_sock
.stream
, 0);
605 if (fcntl(fd
, F_GETFL
) >= 0 && assign
->managed_size
> 0)
610 } else if (iface
->addr6_len
< 1)
613 /* Try honoring the hint first */
614 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
615 if (assign
->assigned
) {
616 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
617 if (c
->length
== 128 || c
->length
== 0)
620 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
621 list_add_tail(&assign
->head
, &c
->head
);
623 if (assign
->flags
& OAF_BOUND
)
624 apply_lease(iface
, assign
, true);
629 if (c
->assigned
!= 0)
630 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
634 /* Fallback to a variable assignment */
636 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
637 if (c
->length
== 128 || c
->length
== 0)
640 current
= (current
+ asize
) & (~asize
);
641 if (current
+ asize
< c
->assigned
) {
642 assign
->assigned
= current
;
643 list_add_tail(&assign
->head
, &c
->head
);
645 if (assign
->flags
& OAF_BOUND
)
646 apply_lease(iface
, assign
, true);
651 if (c
->assigned
!= 0)
652 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
658 static bool assign_na(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
660 /* Seed RNG with checksum of DUID */
662 for (size_t i
= 0; i
< assign
->clid_len
; ++i
)
663 seed
+= assign
->clid_data
[i
];
666 /* Try to assign up to 100x */
667 for (size_t i
= 0; i
< 100; ++i
) {
669 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
671 struct dhcpv6_assignment
*c
;
672 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
676 if (c
->assigned
> try || c
->length
!= 128) {
677 assign
->assigned
= try;
678 list_add_tail(&assign
->head
, &c
->head
);
680 } else if (c
->assigned
== try)
688 static void handle_addrlist_change(struct netevent_handler_info
*info
)
690 struct interface
*iface
= info
->iface
;
691 struct dhcpv6_assignment
*c
, *d
, *border
= list_last_entry(
692 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
693 time_t now
= odhcpd_time();
696 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
697 if (c
!= border
&& iface
->ra_managed
== RA_MANAGED_NO_MFLAG
698 && (c
->flags
& OAF_BOUND
))
699 __apply_lease(iface
, c
, info
->addrs_old
.addrs
,
700 info
->addrs_old
.len
, false);
702 for (size_t i
= 0; i
< iface
->addr6_len
; ++i
) {
703 if (iface
->addr6
[i
].preferred
> (uint32_t)now
&&
704 iface
->addr6
[i
].prefix
< 64 &&
705 iface
->addr6
[i
].prefix
> minprefix
)
706 minprefix
= iface
->addr6
[i
].prefix
;
709 if (minprefix
> 32 && minprefix
<= 64)
710 border
->assigned
= 1U << (64 - minprefix
);
712 border
->assigned
= 0;
714 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
715 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
716 if (c
->clid_len
== 0 || (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
< now
) ||
720 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
721 list_move(&c
->head
, &reassign
);
722 else if (c
!= border
&& (c
->flags
& OAF_BOUND
))
723 apply_lease(iface
, c
, true);
725 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
728 /* Leave all other assignments of that client alone */
729 struct dhcpv6_assignment
*a
;
730 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
731 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
732 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
733 a
->reconf_cnt
= INT_MAX
;
737 while (!list_empty(&reassign
)) {
738 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
740 if (!assign_pd(iface
, c
)) {
742 list_add(&c
->head
, &iface
->ia_assignments
);
746 dhcpv6_write_statefile();
749 static void reconf_timeout_cb(struct uloop_timeout
*event
)
751 struct dhcpv6_assignment
*a
= container_of(event
, struct dhcpv6_assignment
, reconf_timer
);
753 if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< DHCPV6_REC_MAX_RC
) {
755 uloop_timeout_set(&a
->reconf_timer
,
756 DHCPV6_REC_TIMEOUT
<< a
->reconf_cnt
);
762 static void start_reconf(struct dhcpv6_assignment
*a
)
764 uloop_timeout_set(&a
->reconf_timer
,
765 DHCPV6_REC_TIMEOUT
<< a
->reconf_cnt
);
766 a
->reconf_timer
.cb
= reconf_timeout_cb
;
772 static void stop_reconf(struct dhcpv6_assignment
*a
)
774 uloop_timeout_cancel(&a
->reconf_timer
);
776 a
->reconf_timer
.cb
= NULL
;
779 static void valid_until_cb(struct uloop_timeout
*event
)
781 time_t now
= odhcpd_time();
782 struct interface
*iface
;
783 list_for_each_entry(iface
, &interfaces
, head
) {
784 if (iface
->dhcpv6
!= MODE_SERVER
|| iface
->ia_assignments
.next
== NULL
)
787 struct dhcpv6_assignment
*a
, *n
;
788 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
789 if (!INFINITE_VALID(a
->valid_until
) && a
->valid_until
< now
) {
790 if ((a
->length
< 128 && a
->clid_len
> 0) ||
791 (a
->length
== 128 && a
->clid_len
== 0))
792 free_dhcpv6_assignment(a
);
797 uloop_timeout_set(event
, 1000);
800 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
801 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
802 struct interface
*iface
, bool request
)
804 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
807 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
808 size_t datalen
= sizeof(out
);
809 time_t now
= odhcpd_time();
812 struct __attribute__((packed
)) {
816 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
819 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
820 datalen
+= sizeof(stat
);
825 leasetime
= a
->leasetime
;
827 leasetime
= iface
->dhcpv4_leasetime
;
829 uint32_t pref
= leasetime
;
830 uint32_t valid
= leasetime
;
832 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->addr6
;
833 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->addr6_len
;
834 size_t m
= get_preferred_addr(addrs
, addrlen
);
836 for (size_t i
= 0; i
< addrlen
; ++i
) {
837 uint32_t prefix_pref
= addrs
[i
].preferred
;
838 uint32_t prefix_valid
= addrs
[i
].valid
;
840 if (!valid_addr(&addrs
[i
], now
))
843 if (prefix_pref
!= UINT32_MAX
)
846 if (prefix_valid
!= UINT32_MAX
)
849 if (a
->length
< 128) {
850 struct dhcpv6_ia_prefix p
= {
851 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
852 .len
= htons(sizeof(p
) - 4),
853 .preferred
= htonl(prefix_pref
),
854 .valid
= htonl(prefix_valid
),
855 .prefix
= (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
856 .addr
= addrs
[i
].addr
.in6
,
858 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
859 p
.addr
.s6_addr32
[2] = p
.addr
.s6_addr32
[3] = 0;
861 size_t entrlen
= sizeof(p
) - 4;
863 if (datalen
+ entrlen
+ 4 > buflen
||
864 (a
->assigned
== 0 && a
->managed_size
== 0) ||
865 !valid_prefix_length(a
, addrs
[i
].prefix
))
868 memcpy(buf
+ datalen
, &p
, sizeof(p
));
869 datalen
+= entrlen
+ 4;
871 struct dhcpv6_ia_addr n
= {
872 .type
= htons(DHCPV6_OPT_IA_ADDR
),
873 .len
= htons(sizeof(n
) - 4),
874 .addr
= addrs
[i
].addr
.in6
,
875 .preferred
= htonl(prefix_pref
),
876 .valid
= htonl(prefix_valid
)
878 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
879 size_t entrlen
= sizeof(n
) - 4;
881 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
) ||
883 datalen
+ entrlen
+ 4 > buflen
)
886 memcpy(buf
+ datalen
, &n
, sizeof(n
));
887 datalen
+= entrlen
+ 4;
890 /* Calculate T1 / T2 based on non-deprecated addresses */
891 if (prefix_pref
> 0) {
892 if (prefix_pref
< pref
)
895 if (prefix_valid
< valid
)
896 valid
= prefix_valid
;
900 if (!INFINITE_VALID(a
->valid_until
))
901 /* UINT32_MAX is considered as infinite leasetime */
902 a
->valid_until
= (valid
== UINT32_MAX
) ? 0 : valid
+ now
;
904 out
.t1
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 5 / 10);
905 out
.t2
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 8 / 10);
915 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
916 uint16_t otype
, olen
;
917 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
918 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
919 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
920 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
921 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
926 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->addr6
;
927 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->addr6_len
;
929 for (size_t i
= 0; i
< addrlen
; ++i
) {
930 if (!valid_addr(&addrs
[i
], now
))
933 struct in6_addr addr
= addrs
[i
].addr
.in6
;
934 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
935 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
936 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
938 if (!memcmp(&p
->addr
, &addr
, sizeof(addr
)) &&
939 p
->prefix
== ((a
->managed
) ? addrs
[i
].prefix
: a
->length
))
942 addr
.s6_addr32
[3] = htonl(a
->assigned
);
944 if (!memcmp(&n
->addr
, &addr
, sizeof(addr
)))
951 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
952 struct dhcpv6_ia_prefix inv
= {
953 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
954 .len
= htons(sizeof(inv
) - 4),
961 if (datalen
+ sizeof(inv
) > buflen
)
964 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
965 datalen
+= sizeof(inv
);
967 struct dhcpv6_ia_addr inv
= {
968 .type
= htons(DHCPV6_OPT_IA_ADDR
),
969 .len
= htons(sizeof(inv
) - 4),
975 if (datalen
+ sizeof(inv
) > buflen
)
978 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
979 datalen
+= sizeof(inv
);
986 out
.len
= htons(datalen
- 4);
987 memcpy(buf
, &out
, sizeof(out
));
997 static void dhcpv6_log_ia_addr(struct in6_addr
*addr
, int prefix
, _unused
uint32_t pref
,
998 _unused
uint32_t valid
, void *arg
)
1000 struct log_ctxt
*ctxt
= (struct log_ctxt
*)arg
;
1001 char addrbuf
[INET6_ADDRSTRLEN
];
1003 inet_ntop(AF_INET6
, addr
, addrbuf
, sizeof(addrbuf
));
1004 ctxt
->buf_idx
+= snprintf(ctxt
->buf
+ ctxt
->buf_idx
, ctxt
->buf_len
- ctxt
->buf_idx
,
1005 "%s/%d ", addrbuf
, prefix
);
1008 static void dhcpv6_log(uint8_t msgtype
, struct interface
*iface
, time_t now
,
1009 const char *duidbuf
, bool is_pd
, struct dhcpv6_assignment
*a
, int code
)
1011 const char *type
= "UNKNOWN";
1012 const char *status
= "UNKNOWN";
1014 if (msgtype
== DHCPV6_MSG_RENEW
)
1018 case DHCPV6_MSG_SOLICIT
:
1021 case DHCPV6_MSG_REQUEST
:
1024 case DHCPV6_MSG_CONFIRM
:
1027 case DHCPV6_MSG_RENEW
:
1030 case DHCPV6_MSG_REBIND
:
1033 case DHCPV6_MSG_RELEASE
:
1036 case DHCPV6_MSG_DECLINE
:
1042 case DHCPV6_STATUS_OK
:
1045 case DHCPV6_STATUS_NOADDRSAVAIL
:
1046 status
= "no addresses available";
1048 case DHCPV6_STATUS_NOBINDING
:
1049 status
= "no binding";
1051 case DHCPV6_STATUS_NOTONLINK
:
1052 status
= "not on-link";
1054 case DHCPV6_STATUS_NOPREFIXAVAIL
:
1055 status
= "no prefix available";
1059 char leasebuf
[256] = "";
1062 struct log_ctxt ctxt
= {.buf
= leasebuf
,
1063 .buf_len
= sizeof(leasebuf
),
1066 dhcpv6_enum_ia_addrs(iface
, a
, now
, dhcpv6_log_ia_addr
, &ctxt
);
1069 syslog(LOG_WARNING
, "DHCPV6 %s %s from %s on %s: %s %s", type
, (is_pd
) ? "IA_PD" : "IA_NA",
1070 duidbuf
, iface
->ifname
, status
, leasebuf
);
1073 ssize_t
dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
1074 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
1076 time_t now
= odhcpd_time();
1077 size_t response_len
= 0;
1078 const struct dhcpv6_client_header
*hdr
= data
;
1079 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
1080 uint16_t otype
, olen
;
1081 /* Find and parse client-id and hostname */
1082 bool accept_reconf
= false;
1083 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1085 size_t hostname_len
= 0;
1086 bool notonlink
= false;
1089 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1090 if (otype
== DHCPV6_OPT_CLIENTID
) {
1094 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
1095 memcpy(mac
, &odata
[8], sizeof(mac
));
1096 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
1097 memcpy(mac
, &odata
[4], sizeof(mac
));
1100 odhcpd_hexlify(duidbuf
, odata
, olen
);
1101 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
1102 uint8_t fqdn_buf
[256];
1103 memcpy(fqdn_buf
, odata
, olen
);
1104 fqdn_buf
[olen
++] = 0;
1106 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
1107 hostname_len
= strcspn(hostname
, ".");
1108 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
)
1109 accept_reconf
= true;
1112 if (!clid_data
|| !clid_len
|| clid_len
> 130)
1115 struct dhcpv6_assignment
*first
= NULL
;
1116 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1117 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
1118 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
1119 bool ia_addr_present
= false;
1120 if (!is_pd
&& !is_na
)
1123 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
1124 size_t ia_response_len
= 0;
1125 uint8_t reqlen
= (is_pd
) ? 62 : 128;
1126 uint32_t reqhint
= 0;
1128 /* Parse request hint for IA-PD */
1131 uint16_t stype
, slen
;
1132 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1133 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
1136 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
1139 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
1140 if (reqlen
> 32 && reqlen
<= 64)
1141 reqhint
&= (1U << (64 - reqlen
)) - 1;
1149 uint16_t stype
, slen
;
1150 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1151 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
1154 ia_addr_present
= true;
1158 /* Find assignment */
1159 struct dhcpv6_assignment
*c
, *a
= NULL
;
1160 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
1161 if (((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) ||
1162 (c
->clid_len
>= clid_len
&& !c
->clid_data
[0] && !c
->clid_data
[1]
1163 && !memcmp(c
->mac
, mac
, sizeof(mac
)))) &&
1164 (c
->iaid
== ia
->iaid
|| INFINITE_VALID(c
->valid_until
) || now
< c
->valid_until
) &&
1165 ((is_pd
&& c
->length
<= 64) || (is_na
&& c
->length
== 128))) {
1169 if (a
->flags
& OAF_BOUND
)
1170 apply_lease(iface
, a
, false);
1172 memcpy(a
->clid_data
, clid_data
, clid_len
);
1173 a
->clid_len
= clid_len
;
1181 /* Generic message handling */
1182 uint16_t status
= DHCPV6_STATUS_OK
;
1183 if (a
&& a
->managed_size
< 0)
1186 if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
||
1187 hdr
->msg_type
== DHCPV6_MSG_REQUEST
||
1188 (hdr
->msg_type
== DHCPV6_MSG_REBIND
&& !a
)) {
1189 bool assigned
= !!a
;
1191 if (!a
&& !iface
->no_dynamic_dhcp
) {
1192 /* Create new binding */
1193 a
= calloc(1, sizeof(*a
) + clid_len
);
1195 a
->clid_len
= clid_len
;
1199 a
->assigned
= reqhint
;
1200 /* Set valid time to current time indicating */
1201 /* assignment is not having infinite lifetime */
1202 a
->valid_until
= now
;
1206 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
1208 odhcpd_urandom(a
->key
, sizeof(a
->key
));
1209 memcpy(a
->clid_data
, clid_data
, clid_len
);
1212 while (!(assigned
= assign_pd(iface
, a
)) &&
1213 !a
->managed_size
&& ++a
->length
<= 64);
1215 assigned
= assign_na(iface
, a
);
1217 if (a
->managed_size
&& !assigned
)
1222 if (!assigned
|| iface
->addr6_len
== 0)
1223 /* Set error status */
1224 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
1225 else if (assigned
&& !first
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1226 size_t handshake_len
= 4;
1228 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
1232 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1233 struct dhcpv6_auth_reconfigure auth
= {
1234 htons(DHCPV6_OPT_AUTH
),
1235 htons(sizeof(auth
) - 4),
1237 {htonl(time(NULL
)), htonl(++serial
)},
1241 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
1242 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
1243 handshake_len
+= sizeof(auth
);
1246 buf
+= handshake_len
;
1247 buflen
-= handshake_len
;
1248 response_len
+= handshake_len
;
1253 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
,
1254 hdr
->msg_type
== DHCPV6_MSG_REBIND
? false : true);
1256 /* Was only a solicitation: mark binding for removal */
1257 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
1258 a
->flags
&= ~OAF_BOUND
;
1260 if (!(a
->flags
& OAF_STATIC
))
1261 a
->valid_until
= now
;
1262 } else if (assigned
&&
1263 (hdr
->msg_type
== DHCPV6_MSG_REQUEST
||
1264 hdr
->msg_type
== DHCPV6_MSG_REBIND
)) {
1265 if (hostname_len
> 0) {
1266 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
1268 memcpy(a
->hostname
, hostname
, hostname_len
);
1269 a
->hostname
[hostname_len
] = 0;
1272 a
->accept_reconf
= accept_reconf
;
1273 a
->flags
|= OAF_BOUND
;
1274 apply_lease(iface
, a
, true);
1275 } else if (!assigned
&& a
&& a
->managed_size
== 0) {
1276 /* Cleanup failed assignment */
1277 free_dhcpv6_assignment(a
);
1280 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1281 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1282 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1283 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1284 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1285 status
= DHCPV6_STATUS_NOBINDING
;
1286 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1287 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1288 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1289 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1291 a
->flags
|= OAF_BOUND
;
1292 apply_lease(iface
, a
, true);
1294 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1295 if (!(a
->flags
& OAF_STATIC
))
1296 a
->valid_until
= now
- 1;
1298 if (a
->flags
& OAF_BOUND
) {
1299 apply_lease(iface
, a
, false);
1300 a
->flags
&= ~OAF_BOUND
;
1302 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128) {
1303 a
->flags
&= ~OAF_BOUND
;
1305 if (!(a
->flags
& OAF_STATIC
)) {
1307 a
->valid_until
= now
+ 3600; /* Block address for 1h */
1310 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
&& ia_addr_present
) {
1311 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1312 status
= DHCPV6_STATUS_NOTONLINK
;
1313 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1317 buf
+= ia_response_len
;
1318 buflen
-= ia_response_len
;
1319 response_len
+= ia_response_len
;
1320 dhcpv6_log(hdr
->msg_type
, iface
, now
, duidbuf
, is_pd
, a
, status
);
1323 if ((hdr
->msg_type
== DHCPV6_MSG_RELEASE
|| hdr
->msg_type
== DHCPV6_MSG_DECLINE
|| notonlink
) &&
1324 response_len
+ 6 < buflen
) {
1326 buf
[1] = DHCPV6_OPT_STATUS
;
1330 buf
[5] = (notonlink
) ? DHCPV6_STATUS_NOTONLINK
: DHCPV6_STATUS_OK
;
1334 dhcpv6_write_statefile();
1337 return response_len
;