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 get_preferred_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_enum_ia_addrs(struct interface
*iface
, struct dhcpv6_assignment
*c
,
236 time_t now
, dhcpv6_binding_cb_handler_t func
, void *arg
)
238 struct odhcpd_ipaddr
*addrs
= (c
->managed
) ? c
->managed
: iface
->ia_addr
;
239 size_t addrlen
= (c
->managed
) ? (size_t)c
->managed_size
: iface
->ia_addr_len
;
240 size_t m
= get_preferred_addr(addrs
, addrlen
);
242 for (size_t i
= 0; i
< addrlen
; ++i
) {
243 struct in6_addr addr
;
244 uint32_t pref
, valid
;
245 int prefix
= c
->managed
? addrs
[i
].prefix
: c
->length
;
247 if (!valid_addr(&addrs
[i
], now
))
250 addr
= addrs
[i
].addr
;
251 pref
= addrs
[i
].preferred
;
252 valid
= addrs
[i
].valid
;
254 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
))
257 addr
.s6_addr32
[3] = htonl(c
->assigned
);
259 if (!valid_prefix_length(c
, addrs
[i
].prefix
))
262 addr
.s6_addr32
[1] |= htonl(c
->assigned
);
263 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
266 if (pref
!= UINT32_MAX
)
269 if (valid
!= UINT32_MAX
)
272 func(&addr
, prefix
, pref
, valid
, arg
);
279 struct dhcpv6_assignment
*c
;
280 struct interface
*iface
;
286 void dhcpv6_write_ia_addr(struct in6_addr
*addr
, int prefix
, _unused
uint32_t pref
,
287 _unused
uint32_t valid
, void *arg
)
289 struct write_ctxt
*ctxt
= (struct write_ctxt
*)arg
;
290 char ipbuf
[INET6_ADDRSTRLEN
];
292 inet_ntop(AF_INET6
, addr
, ipbuf
, sizeof(ipbuf
) - 1);
294 if (ctxt
->c
->length
== 128 && ctxt
->c
->hostname
) {
295 fputs(ipbuf
, ctxt
->fp
);
298 if (dn_expand(ctxt
->iface
->search
, ctxt
->iface
->search
+ ctxt
->iface
->search_len
,
299 ctxt
->iface
->search
, b
, sizeof(b
)) > 0)
300 fprintf(ctxt
->fp
, "\t%s.%s", ctxt
->c
->hostname
, b
);
302 fprintf(ctxt
->fp
, "\t%s\n", ctxt
->c
->hostname
);
303 md5_hash(ipbuf
, strlen(ipbuf
), &ctxt
->md5
);
304 md5_hash(ctxt
->c
->hostname
, strlen(ctxt
->c
->hostname
), &ctxt
->md5
);
307 ctxt
->buf_idx
+= snprintf(ctxt
->buf
+ ctxt
->buf_idx
,ctxt
->buf_len
- ctxt
->buf_idx
,
308 "%s/%d ", ipbuf
, prefix
);
311 void dhcpv6_write_statefile(void)
313 struct write_ctxt ctxt
;
315 md5_begin(&ctxt
.md5
);
317 if (config
.dhcp_statefile
) {
318 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
319 int fd
= open(config
.dhcp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
325 ret
= lockf(fd
, F_LOCK
, 0);
330 if (ftruncate(fd
, 0) < 0) {}
332 ctxt
.fp
= fdopen(fd
, "w");
339 ctxt
.buf_len
= sizeof(leasebuf
);
341 list_for_each_entry(ctxt
.iface
, &interfaces
, head
) {
342 if (ctxt
.iface
->dhcpv6
!= RELAYD_SERVER
&&
343 ctxt
.iface
->dhcpv4
!= RELAYD_SERVER
)
346 if (ctxt
.iface
->dhcpv6
== RELAYD_SERVER
&&
347 ctxt
.iface
->ia_assignments
.next
) {
348 list_for_each_entry(ctxt
.c
, &ctxt
.iface
->ia_assignments
, head
) {
349 if (!(ctxt
.c
->flags
& OAF_BOUND
) || ctxt
.c
->managed_size
< 0)
354 odhcpd_hexlify(duidbuf
, ctxt
.c
->clid_data
, ctxt
.c
->clid_len
);
356 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
357 ctxt
.buf_idx
= snprintf(ctxt
.buf
, ctxt
.buf_len
, "# %s %s %x %s %ld %x %u ",
358 ctxt
.iface
->ifname
, duidbuf
, ntohl(ctxt
.c
->iaid
),
359 (ctxt
.c
->hostname
? ctxt
.c
->hostname
: "-"),
360 (ctxt
.c
->valid_until
> now
?
361 (ctxt
.c
->valid_until
- now
+ wall_time
) :
362 (INFINITE_VALID(ctxt
.c
->valid_until
) ? -1 : 0)),
363 ctxt
.c
->assigned
, (unsigned)ctxt
.c
->length
);
365 if (INFINITE_VALID(ctxt
.c
->valid_until
) || ctxt
.c
->valid_until
> now
)
366 dhcpv6_enum_ia_addrs(ctxt
.iface
, ctxt
.c
, now
,
367 dhcpv6_write_ia_addr
, &ctxt
);
369 ctxt
.buf
[ctxt
.buf_idx
- 1] = '\n';
370 fwrite(ctxt
.buf
, 1, ctxt
.buf_idx
, ctxt
.fp
);
374 if (ctxt
.iface
->dhcpv4
== RELAYD_SERVER
&&
375 ctxt
.iface
->dhcpv4_assignments
.next
) {
376 struct dhcpv4_assignment
*c
;
377 list_for_each_entry(c
, &ctxt
.iface
->dhcpv4_assignments
, head
) {
378 if (!(c
->flags
& OAF_BOUND
))
381 char ipbuf
[INET6_ADDRSTRLEN
];
383 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
385 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
386 ctxt
.buf_idx
= snprintf(ctxt
.buf
, ctxt
.buf_len
, "# %s %s ipv4 %s %ld %x 32 ",
387 ctxt
.iface
->ifname
, duidbuf
,
388 (c
->hostname
? c
->hostname
: "-"),
389 (c
->valid_until
> now
?
390 (c
->valid_until
- now
+ wall_time
) :
391 (INFINITE_VALID(c
->valid_until
) ? -1 : 0)),
394 struct in_addr addr
= {htonl(c
->addr
)};
395 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
398 fputs(ipbuf
, ctxt
.fp
);
401 if (dn_expand(ctxt
.iface
->search
,
402 ctxt
.iface
->search
+ ctxt
.iface
->search_len
,
403 ctxt
.iface
->search
, b
, sizeof(b
)) > 0)
404 fprintf(ctxt
.fp
, "\t%s.%s", c
->hostname
, b
);
406 fprintf(ctxt
.fp
, "\t%s\n", c
->hostname
);
407 md5_hash(ipbuf
, strlen(ipbuf
), &ctxt
.md5
);
408 md5_hash(c
->hostname
, strlen(c
->hostname
), &ctxt
.md5
);
411 ctxt
.buf_idx
+= snprintf(ctxt
.buf
+ ctxt
.buf_idx
,
412 ctxt
.buf_len
- ctxt
.buf_idx
,
414 ctxt
.buf
[ctxt
.buf_idx
- 1] = '\n';
415 fwrite(ctxt
.buf
, 1, ctxt
.buf_idx
, ctxt
.fp
);
424 md5_end(newmd5
, &ctxt
.md5
);
426 if (config
.dhcp_cb
&& memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
427 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
428 char *argv
[2] = {config
.dhcp_cb
, NULL
};
430 execv(argv
[0], argv
);
437 static void apply_lease(struct interface
*iface
, struct dhcpv6_assignment
*a
, bool add
)
439 if (a
->length
> 64 || a
->managed_size
< 0)
442 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
443 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
445 for (size_t i
= 0; i
< addrlen
; ++i
) {
446 struct in6_addr prefix
= addrs
[i
].addr
;
447 prefix
.s6_addr32
[1] |= htonl(a
->assigned
);
448 prefix
.s6_addr32
[2] = prefix
.s6_addr32
[3] = 0;
449 odhcpd_setup_route(&prefix
, (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
450 iface
, &a
->peer
.sin6_addr
, 1024, add
);
454 /* More data was received from TCP connection */
455 static void managed_handle_pd_data(struct ustream
*s
, _unused
int bytes_new
)
457 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
458 time_t now
= odhcpd_time();
459 bool first
= c
->managed_size
< 0;
463 char *data
= ustream_get_read_buf(s
, &pending
);
464 char *end
= memmem(data
, pending
, "\n\n", 2);
473 if (c
->accept_reconf
)
477 for (char *line
= strtok_r(data
, "\n", &saveptr
); line
; line
= strtok_r(NULL
, "\n", &saveptr
)) {
478 c
->managed
= realloc(c
->managed
, (c
->managed_size
+ 1) * sizeof(*c
->managed
));
479 struct odhcpd_ipaddr
*n
= &c
->managed
[c
->managed_size
];
481 char *saveptr2
, *x
= strtok_r(line
, "/", &saveptr2
);
482 if (!x
|| inet_pton(AF_INET6
, x
, &n
->addr
) < 1)
485 x
= strtok_r(NULL
, ",", &saveptr2
);
486 if (sscanf(x
, "%hhu", &n
->prefix
) < 1)
489 x
= strtok_r(NULL
, ",", &saveptr2
);
490 if (sscanf(x
, "%u", &n
->preferred
) < 1)
493 x
= strtok_r(NULL
, ",", &saveptr2
);
494 if (sscanf(x
, "%u", &n
->valid
) < 1)
497 if (n
->preferred
> n
->valid
)
500 if (UINT32_MAX
- now
< n
->preferred
)
501 n
->preferred
= UINT32_MAX
;
505 if (UINT32_MAX
- now
< n
->valid
)
506 n
->valid
= UINT32_MAX
;
515 ustream_consume(s
, end
- data
);
518 if (first
&& c
->managed_size
== 0)
519 free_dhcpv6_assignment(c
);
520 else if (first
&& !(c
->flags
& OAF_STATIC
))
521 c
->valid_until
= now
+ 150;
525 /* TCP transmission has ended, either because of success or timeout or other error */
526 static void managed_handle_pd_done(struct ustream
*s
)
528 struct dhcpv6_assignment
*c
= container_of(s
, struct dhcpv6_assignment
, managed_sock
);
530 if (!(c
->flags
& OAF_STATIC
))
531 c
->valid_until
= odhcpd_time() + 15;
535 if (c
->accept_reconf
)
539 static bool assign_pd(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
541 struct dhcpv6_assignment
*c
;
543 if (iface
->dhcpv6_pd_manager
[0]) {
544 int fd
= usock(USOCK_UNIX
| USOCK_TCP
, iface
->dhcpv6_pd_manager
, NULL
);
547 odhcpd_hexlify(iaidbuf
, assign
->clid_data
, assign
->clid_len
);
549 assign
->managed_sock
.stream
.notify_read
= managed_handle_pd_data
;
550 assign
->managed_sock
.stream
.notify_state
= managed_handle_pd_done
;
551 ustream_fd_init(&assign
->managed_sock
, fd
);
552 ustream_printf(&assign
->managed_sock
.stream
, "%s,%x\n::/%d,0,0\n\n",
553 iaidbuf
, assign
->iaid
, assign
->length
);
554 ustream_write_pending(&assign
->managed_sock
.stream
);
555 assign
->managed_size
= -1;
557 if (!(assign
->flags
& OAF_STATIC
))
558 assign
->valid_until
= odhcpd_time() + 15;
560 list_add(&assign
->head
, &iface
->ia_assignments
);
562 /* Wait initial period of up to 250ms for immediate assignment */
563 struct pollfd pfd
= { .fd
= fd
, .events
= POLLIN
};
565 managed_handle_pd_data(&assign
->managed_sock
.stream
, 0);
567 if (fcntl(fd
, F_GETFL
) >= 0 && assign
->managed_size
> 0)
572 } else if (iface
->ia_addr_len
< 1)
575 /* Try honoring the hint first */
576 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
577 if (assign
->assigned
) {
578 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
579 if (c
->length
== 128 || c
->length
== 0)
582 if (assign
->assigned
>= current
&& assign
->assigned
+ asize
< c
->assigned
) {
583 list_add_tail(&assign
->head
, &c
->head
);
585 if (assign
->flags
& OAF_BOUND
)
586 apply_lease(iface
, assign
, true);
591 if (c
->assigned
!= 0)
592 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
596 /* Fallback to a variable assignment */
598 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
599 if (c
->length
== 128 || c
->length
== 0)
602 current
= (current
+ asize
) & (~asize
);
603 if (current
+ asize
< c
->assigned
) {
604 assign
->assigned
= current
;
605 list_add_tail(&assign
->head
, &c
->head
);
607 if (assign
->flags
& OAF_BOUND
)
608 apply_lease(iface
, assign
, true);
613 if (c
->assigned
!= 0)
614 current
= (c
->assigned
+ (1 << (64 - c
->length
)));
620 static bool assign_na(struct interface
*iface
, struct dhcpv6_assignment
*assign
)
622 /* Seed RNG with checksum of DUID */
624 for (size_t i
= 0; i
< assign
->clid_len
; ++i
)
625 seed
+= assign
->clid_data
[i
];
628 /* Try to assign up to 100x */
629 for (size_t i
= 0; i
< 100; ++i
) {
631 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
633 struct dhcpv6_assignment
*c
;
634 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
638 if (c
->assigned
> try || c
->length
!= 128) {
639 assign
->assigned
= try;
640 list_add_tail(&assign
->head
, &c
->head
);
642 } else if (c
->assigned
== try)
650 void dhcpv6_ia_preupdate(struct interface
*iface
)
652 if (iface
->dhcpv6
!= RELAYD_SERVER
)
655 struct dhcpv6_assignment
*c
, *border
= list_last_entry(
656 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
658 list_for_each_entry(c
, &iface
->ia_assignments
, head
)
659 if (c
!= border
&& !iface
->managed
&& (c
->flags
& OAF_BOUND
))
660 apply_lease(iface
, c
, false);
663 void dhcpv6_ia_postupdate(struct interface
*iface
, time_t now
)
665 if (iface
->dhcpv6
!= RELAYD_SERVER
)
669 for (size_t i
= 0; i
< iface
->ia_addr_len
; ++i
) {
670 if (iface
->ia_addr
[i
].preferred
> (uint32_t)now
&&
671 iface
->ia_addr
[i
].prefix
< 64 &&
672 iface
->ia_addr
[i
].prefix
> minprefix
)
673 minprefix
= iface
->ia_addr
[i
].prefix
;
676 struct dhcpv6_assignment
*border
= list_last_entry(
677 &iface
->ia_assignments
, struct dhcpv6_assignment
, head
);
679 if (minprefix
> 32 && minprefix
<= 64)
680 border
->assigned
= 1U << (64 - minprefix
);
682 border
->assigned
= 0;
684 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
685 struct dhcpv6_assignment
*c
, *d
;
686 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
687 if (c
->clid_len
== 0 || (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
< now
) ||
691 if (c
->length
< 128 && c
->assigned
>= border
->assigned
&& c
!= border
)
692 list_move(&c
->head
, &reassign
);
693 else if (c
!= border
&& (c
->flags
& OAF_BOUND
))
694 apply_lease(iface
, c
, true);
696 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
698 c
->reconf_sent
= now
;
699 send_reconf(iface
, c
);
701 /* Leave all other assignments of that client alone */
702 struct dhcpv6_assignment
*a
;
703 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
704 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
705 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
706 c
->reconf_cnt
= INT_MAX
;
710 while (!list_empty(&reassign
)) {
711 c
= list_first_entry(&reassign
, struct dhcpv6_assignment
, head
);
713 if (!assign_pd(iface
, c
)) {
715 list_add(&c
->head
, &iface
->ia_assignments
);
719 dhcpv6_write_statefile();
722 static void reconf_timer(struct uloop_timeout
*event
)
724 time_t now
= odhcpd_time();
725 struct interface
*iface
;
726 list_for_each_entry(iface
, &interfaces
, head
) {
727 if (iface
->dhcpv6
!= RELAYD_SERVER
|| iface
->ia_assignments
.next
== NULL
)
730 struct dhcpv6_assignment
*a
, *n
;
731 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
732 if (!INFINITE_VALID(a
->valid_until
) && a
->valid_until
< now
) {
733 if ((a
->length
< 128 && a
->clid_len
> 0) ||
734 (a
->length
== 128 && a
->clid_len
== 0))
735 free_dhcpv6_assignment(a
);
737 } else if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< 8 &&
738 now
> a
->reconf_sent
+ (1 << a
->reconf_cnt
)) {
740 a
->reconf_sent
= now
;
741 send_reconf(iface
, a
);
745 uloop_timeout_set(event
, 2000);
748 static size_t append_reply(uint8_t *buf
, size_t buflen
, uint16_t status
,
749 const struct dhcpv6_ia_hdr
*ia
, struct dhcpv6_assignment
*a
,
750 struct interface
*iface
, bool request
)
752 if (buflen
< sizeof(*ia
) + sizeof(struct dhcpv6_ia_prefix
))
755 struct dhcpv6_ia_hdr out
= {ia
->type
, 0, ia
->iaid
, 0, 0};
756 size_t datalen
= sizeof(out
);
757 time_t now
= odhcpd_time();
760 struct __attribute__((packed
)) {
764 } stat
= {htons(DHCPV6_OPT_STATUS
), htons(sizeof(stat
) - 4),
767 memcpy(buf
+ datalen
, &stat
, sizeof(stat
));
768 datalen
+= sizeof(stat
);
773 leasetime
= a
->leasetime
;
775 leasetime
= iface
->dhcpv4_leasetime
;
777 uint32_t pref
= leasetime
;
778 uint32_t valid
= leasetime
;
780 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
781 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
782 size_t m
= get_preferred_addr(addrs
, addrlen
);
784 for (size_t i
= 0; i
< addrlen
; ++i
) {
785 uint32_t prefix_pref
= addrs
[i
].preferred
;
786 uint32_t prefix_valid
= addrs
[i
].valid
;
788 if (!valid_addr(&addrs
[i
], now
))
791 if (prefix_pref
!= UINT32_MAX
)
794 if (prefix_valid
!= UINT32_MAX
)
797 if (a
->length
< 128) {
798 struct dhcpv6_ia_prefix p
= {
799 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
800 .len
= htons(sizeof(p
) - 4),
801 .preferred
= htonl(prefix_pref
),
802 .valid
= htonl(prefix_valid
),
803 .prefix
= (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
804 .addr
= addrs
[i
].addr
806 p
.addr
.s6_addr32
[1] |= htonl(a
->assigned
);
807 p
.addr
.s6_addr32
[2] = p
.addr
.s6_addr32
[3] = 0;
809 size_t entrlen
= sizeof(p
) - 4;
811 if (datalen
+ entrlen
+ 4 > buflen
||
812 (a
->assigned
== 0 && a
->managed_size
== 0) ||
813 !valid_prefix_length(a
, addrs
[i
].prefix
))
816 memcpy(buf
+ datalen
, &p
, sizeof(p
));
817 datalen
+= entrlen
+ 4;
819 struct dhcpv6_ia_addr n
= {
820 .type
= htons(DHCPV6_OPT_IA_ADDR
),
821 .len
= htons(sizeof(n
) - 4),
822 .addr
= addrs
[i
].addr
,
823 .preferred
= htonl(prefix_pref
),
824 .valid
= htonl(prefix_valid
)
826 n
.addr
.s6_addr32
[3] = htonl(a
->assigned
);
827 size_t entrlen
= sizeof(n
) - 4;
829 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
) ||
831 datalen
+ entrlen
+ 4 > buflen
)
834 memcpy(buf
+ datalen
, &n
, sizeof(n
));
835 datalen
+= entrlen
+ 4;
838 /* Calculate T1 / T2 based on non-deprecated addresses */
839 if (prefix_pref
> 0) {
840 if (prefix_pref
< pref
)
843 if (prefix_valid
< valid
)
844 valid
= prefix_valid
;
848 if (!INFINITE_VALID(a
->valid_until
))
849 /* UINT32_MAX is considered as infinite leasetime */
850 a
->valid_until
= (valid
== UINT32_MAX
) ? 0 : valid
+ now
;
852 out
.t1
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 5 / 10);
853 out
.t2
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 8 / 10);
863 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
864 uint16_t otype
, olen
;
865 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
866 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
867 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
868 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
869 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
874 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->ia_addr
;
875 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->ia_addr_len
;
877 for (size_t i
= 0; i
< addrlen
; ++i
) {
878 if (!valid_addr(&addrs
[i
], now
))
881 struct in6_addr addr
= addrs
[i
].addr
;
882 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
883 addr
.s6_addr32
[1] |= htonl(a
->assigned
);
884 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
886 if (!memcmp(&p
->addr
, &addr
, sizeof(addr
)) &&
887 p
->prefix
== ((a
->managed
) ? addrs
[i
].prefix
: a
->length
))
890 addr
.s6_addr32
[3] = htonl(a
->assigned
);
892 if (!memcmp(&n
->addr
, &addr
, sizeof(addr
)))
899 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
900 struct dhcpv6_ia_prefix inv
= {
901 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
902 .len
= htons(sizeof(inv
) - 4),
909 if (datalen
+ sizeof(inv
) > buflen
)
912 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
913 datalen
+= sizeof(inv
);
915 struct dhcpv6_ia_addr inv
= {
916 .type
= htons(DHCPV6_OPT_IA_ADDR
),
917 .len
= htons(sizeof(inv
) - 4),
923 if (datalen
+ sizeof(inv
) > buflen
)
926 memcpy(buf
+ datalen
, &inv
, sizeof(inv
));
927 datalen
+= sizeof(inv
);
934 out
.len
= htons(datalen
- 4);
935 memcpy(buf
, &out
, sizeof(out
));
945 static void dhcpv6_log_ia_addr(struct in6_addr
*addr
, int prefix
, _unused
uint32_t pref
,
946 _unused
uint32_t valid
, void *arg
)
948 struct log_ctxt
*ctxt
= (struct log_ctxt
*)arg
;
949 char addrbuf
[INET6_ADDRSTRLEN
];
951 inet_ntop(AF_INET6
, addr
, addrbuf
, sizeof(addrbuf
));
952 ctxt
->buf_idx
+= snprintf(ctxt
->buf
+ ctxt
->buf_idx
, ctxt
->buf_len
- ctxt
->buf_idx
,
953 "%s/%d ", addrbuf
, prefix
);
956 static void dhcpv6_log(uint8_t msgtype
, struct interface
*iface
, time_t now
,
957 const char *duidbuf
, bool is_pd
, struct dhcpv6_assignment
*a
, int code
)
959 const char *type
= "UNKNOWN";
960 const char *status
= "UNKNOWN";
962 if (msgtype
== DHCPV6_MSG_RENEW
)
966 case DHCPV6_MSG_SOLICIT
:
969 case DHCPV6_MSG_REQUEST
:
972 case DHCPV6_MSG_CONFIRM
:
975 case DHCPV6_MSG_RENEW
:
978 case DHCPV6_MSG_REBIND
:
981 case DHCPV6_MSG_RELEASE
:
984 case DHCPV6_MSG_DECLINE
:
990 case DHCPV6_STATUS_OK
:
993 case DHCPV6_STATUS_NOADDRSAVAIL
:
994 status
= "no addresses available";
996 case DHCPV6_STATUS_NOBINDING
:
997 status
= "no binding";
999 case DHCPV6_STATUS_NOTONLINK
:
1000 status
= "not on-link";
1002 case DHCPV6_STATUS_NOPREFIXAVAIL
:
1003 status
= "no prefix available";
1007 char leasebuf
[256] = "";
1010 struct log_ctxt ctxt
= {.buf
= leasebuf
,
1011 .buf_len
= sizeof(leasebuf
),
1014 dhcpv6_enum_ia_addrs(iface
, a
, now
, dhcpv6_log_ia_addr
, &ctxt
);
1017 syslog(LOG_WARNING
, "DHCPV6 %s %s from %s on %s: %s %s", type
, (is_pd
) ? "IA_PD" : "IA_NA",
1018 duidbuf
, iface
->ifname
, status
, leasebuf
);
1021 ssize_t
dhcpv6_handle_ia(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
1022 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
1024 time_t now
= odhcpd_time();
1025 size_t response_len
= 0;
1026 const struct dhcpv6_client_header
*hdr
= data
;
1027 uint8_t *start
= (uint8_t*)&hdr
[1], *odata
;
1028 uint16_t otype
, olen
;
1029 /* Find and parse client-id and hostname */
1030 bool accept_reconf
= false;
1031 uint8_t *clid_data
= NULL
, clid_len
= 0, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1033 size_t hostname_len
= 0;
1034 bool notonlink
= false;
1037 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1038 if (otype
== DHCPV6_OPT_CLIENTID
) {
1042 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
1043 memcpy(mac
, &odata
[8], sizeof(mac
));
1044 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
1045 memcpy(mac
, &odata
[4], sizeof(mac
));
1048 odhcpd_hexlify(duidbuf
, odata
, olen
);
1049 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
1050 uint8_t fqdn_buf
[256];
1051 memcpy(fqdn_buf
, odata
, olen
);
1052 fqdn_buf
[olen
++] = 0;
1054 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
1055 hostname_len
= strcspn(hostname
, ".");
1056 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
)
1057 accept_reconf
= true;
1060 if (!clid_data
|| !clid_len
|| clid_len
> 130)
1063 struct dhcpv6_assignment
*first
= NULL
;
1064 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1065 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
1066 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
1067 bool ia_addr_present
= false;
1068 if (!is_pd
&& !is_na
)
1071 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
1072 size_t ia_response_len
= 0;
1073 uint8_t reqlen
= (is_pd
) ? 62 : 128;
1074 uint32_t reqhint
= 0;
1076 /* Parse request hint for IA-PD */
1079 uint16_t stype
, slen
;
1080 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1081 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
1084 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
1087 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
1088 if (reqlen
> 32 && reqlen
<= 64)
1089 reqhint
&= (1U << (64 - reqlen
)) - 1;
1097 uint16_t stype
, slen
;
1098 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1099 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
1102 ia_addr_present
= true;
1106 /* Find assignment */
1107 struct dhcpv6_assignment
*c
, *a
= NULL
;
1108 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
1109 if (((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) ||
1110 (c
->clid_len
>= clid_len
&& !c
->clid_data
[0] && !c
->clid_data
[1]
1111 && !memcmp(c
->mac
, mac
, sizeof(mac
)))) &&
1112 (c
->iaid
== ia
->iaid
|| INFINITE_VALID(c
->valid_until
) || now
< c
->valid_until
) &&
1113 ((is_pd
&& c
->length
<= 64) || (is_na
&& c
->length
== 128))) {
1117 if (a
->flags
& OAF_BOUND
)
1118 apply_lease(iface
, a
, false);
1120 memcpy(a
->clid_data
, clid_data
, clid_len
);
1121 a
->clid_len
= clid_len
;
1130 /* Generic message handling */
1131 uint16_t status
= DHCPV6_STATUS_OK
;
1132 if (a
&& a
->managed_size
< 0)
1135 if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
||
1136 hdr
->msg_type
== DHCPV6_MSG_REQUEST
||
1137 (hdr
->msg_type
== DHCPV6_MSG_REBIND
&& !a
)) {
1138 bool assigned
= !!a
;
1140 if (!a
&& !iface
->no_dynamic_dhcp
) {
1141 /* Create new binding */
1142 a
= calloc(1, sizeof(*a
) + clid_len
);
1144 a
->clid_len
= clid_len
;
1148 a
->assigned
= reqhint
;
1149 /* Set valid time to current time indicating */
1150 /* assignment is not having infinite lifetime */
1151 a
->valid_until
= now
;
1154 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
1156 odhcpd_urandom(a
->key
, sizeof(a
->key
));
1157 memcpy(a
->clid_data
, clid_data
, clid_len
);
1160 while (!(assigned
= assign_pd(iface
, a
)) &&
1161 !a
->managed_size
&& ++a
->length
<= 64);
1163 assigned
= assign_na(iface
, a
);
1165 if (a
->managed_size
&& !assigned
)
1170 if (!assigned
|| iface
->ia_addr_len
== 0)
1171 /* Set error status */
1172 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
1173 else if (assigned
&& !first
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1174 size_t handshake_len
= 4;
1176 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
1180 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1181 struct dhcpv6_auth_reconfigure auth
= {
1182 htons(DHCPV6_OPT_AUTH
),
1183 htons(sizeof(auth
) - 4),
1185 {htonl(time(NULL
)), htonl(++serial
)},
1189 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
1190 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
1191 handshake_len
+= sizeof(auth
);
1194 buf
+= handshake_len
;
1195 buflen
-= handshake_len
;
1196 response_len
+= handshake_len
;
1201 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
,
1202 hdr
->msg_type
== DHCPV6_MSG_REBIND
? false : true);
1204 /* Was only a solicitation: mark binding for removal */
1205 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
) {
1206 a
->flags
&= ~OAF_BOUND
;
1208 if (!(a
->flags
& OAF_STATIC
))
1209 a
->valid_until
= now
;
1210 } else if (assigned
&&
1211 (hdr
->msg_type
== DHCPV6_MSG_REQUEST
||
1212 hdr
->msg_type
== DHCPV6_MSG_REBIND
)) {
1213 if (hostname_len
> 0) {
1214 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
1216 memcpy(a
->hostname
, hostname
, hostname_len
);
1217 a
->hostname
[hostname_len
] = 0;
1220 a
->accept_reconf
= accept_reconf
;
1221 a
->flags
|= OAF_BOUND
;
1222 apply_lease(iface
, a
, true);
1223 } else if (!assigned
&& a
&& a
->managed_size
== 0) {
1224 /* Cleanup failed assignment */
1225 free_dhcpv6_assignment(a
);
1228 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1229 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1230 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1231 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1232 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1233 status
= DHCPV6_STATUS_NOBINDING
;
1234 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1235 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1236 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1237 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, false);
1239 a
->flags
|= OAF_BOUND
;
1240 apply_lease(iface
, a
, true);
1242 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1243 if (!(a
->flags
& OAF_STATIC
))
1244 a
->valid_until
= now
- 1;
1246 if (a
->flags
& OAF_BOUND
) {
1247 apply_lease(iface
, a
, false);
1248 a
->flags
&= ~OAF_BOUND
;
1250 } else if (hdr
->msg_type
== DHCPV6_MSG_DECLINE
&& a
->length
== 128) {
1251 a
->flags
&= ~OAF_BOUND
;
1253 if (!(a
->flags
& OAF_STATIC
)) {
1255 a
->valid_until
= now
+ 3600; /* Block address for 1h */
1258 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
&& ia_addr_present
) {
1259 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1260 status
= DHCPV6_STATUS_NOTONLINK
;
1261 ia_response_len
= append_reply(buf
, buflen
, status
, ia
, a
, iface
, true);
1265 buf
+= ia_response_len
;
1266 buflen
-= ia_response_len
;
1267 response_len
+= ia_response_len
;
1268 dhcpv6_log(hdr
->msg_type
, iface
, now
, duidbuf
, is_pd
, a
, status
);
1271 if ((hdr
->msg_type
== DHCPV6_MSG_RELEASE
|| hdr
->msg_type
== DHCPV6_MSG_DECLINE
|| notonlink
) &&
1272 response_len
+ 6 < buflen
) {
1274 buf
[1] = DHCPV6_OPT_STATUS
;
1278 buf
[5] = (notonlink
) ? DHCPV6_STATUS_NOTONLINK
: DHCPV6_STATUS_OK
;
1282 dhcpv6_write_statefile();
1285 return response_len
;