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.
33 #include <arpa/inet.h>
34 #include <sys/timerfd.h>
36 #include <libubox/md5.h>
37 #include <libubox/usock.h>
39 #define ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) \
40 ((iface)->dhcpv6_assignall || (i) == (m) || \
41 (addrs)[(i)].prefix > 64)
43 static void dhcpv6_netevent_cb(unsigned long event
, struct netevent_handler_info
*info
);
44 static void apply_lease(struct dhcp_assignment
*a
, bool add
);
45 static void set_border_assignment_size(struct interface
*iface
, struct dhcp_assignment
*b
);
46 static void handle_addrlist_change(struct netevent_handler_info
*info
);
47 static void start_reconf(struct dhcp_assignment
*a
);
48 static void stop_reconf(struct dhcp_assignment
*a
);
49 static void valid_until_cb(struct uloop_timeout
*event
);
51 static struct netevent_handler dhcpv6_netevent_handler
= { .cb
= dhcpv6_netevent_cb
, };
52 static struct uloop_timeout valid_until_timeout
= {.cb
= valid_until_cb
};
53 static uint32_t serial
= 0;
54 static uint8_t statemd5
[16];
56 int dhcpv6_ia_init(void)
58 uloop_timeout_set(&valid_until_timeout
, 1000);
60 netlink_add_netevent_handler(&dhcpv6_netevent_handler
);
65 int dhcpv6_ia_setup_interface(struct interface
*iface
, bool enable
)
67 enable
= enable
&& (iface
->dhcpv6
== MODE_SERVER
);
70 struct dhcp_assignment
*border
;
72 if (list_empty(&iface
->ia_assignments
)) {
73 border
= alloc_assignment(0);
76 syslog(LOG_WARNING
, "Failed to alloc border on %s", iface
->name
);
81 list_add(&border
->head
, &iface
->ia_assignments
);
83 border
= list_last_entry(&iface
->ia_assignments
, struct dhcp_assignment
, head
);
85 set_border_assignment_size(iface
, border
);
87 struct dhcp_assignment
*c
;
89 while (!list_empty(&iface
->ia_assignments
)) {
90 c
= list_first_entry(&iface
->ia_assignments
, struct dhcp_assignment
, head
);
99 static void dhcpv6_netevent_cb(unsigned long event
, struct netevent_handler_info
*info
)
101 struct interface
*iface
= info
->iface
;
103 if (!iface
|| iface
->dhcpv6
!= MODE_SERVER
)
107 case NETEV_ADDR6LIST_CHANGE
:
108 handle_addrlist_change(info
);
116 static inline bool valid_prefix_length(const struct dhcp_assignment
*a
, const uint8_t prefix_length
)
118 return (a
->managed_size
|| a
->length
> prefix_length
);
121 static inline bool valid_addr(const struct odhcpd_ipaddr
*addr
, time_t now
)
123 return (addr
->prefix
<= 96 && addr
->preferred
> (uint32_t)now
);
126 static size_t get_preferred_addr(const struct odhcpd_ipaddr
*addrs
, const size_t addrlen
)
130 for (i
= 0, m
= 0; i
< addrlen
; ++i
) {
131 if (addrs
[i
].preferred
> addrs
[m
].preferred
||
132 (addrs
[i
].preferred
== addrs
[m
].preferred
&&
133 memcmp(&addrs
[i
].addr
, &addrs
[m
].addr
, 16) > 0))
140 static int send_reconf(struct dhcp_assignment
*assign
)
143 struct dhcpv6_client_header hdr
;
147 uint16_t hardware_type
;
152 struct dhcpv6_auth_reconfigure auth
;
155 uint8_t clid_data
[128];
156 } __attribute__((packed
)) reconf_msg
= {
157 .hdr
= {DHCPV6_MSG_RECONFIGURE
, {0, 0, 0}},
158 .srvid_type
= htons(DHCPV6_OPT_SERVERID
),
159 .srvid_len
= htons(10),
160 .duid_type
= htons(3),
161 .hardware_type
= htons(1),
162 .msg_type
= htons(DHCPV6_OPT_RECONF_MSG
),
164 .msg_id
= DHCPV6_MSG_RENEW
,
165 .auth
= {htons(DHCPV6_OPT_AUTH
),
166 htons(sizeof(reconf_msg
.auth
) - 4), 3, 1, 0,
167 {htonl(time(NULL
)), htonl(++serial
)}, 2, {0}},
168 .clid_type
= htons(DHCPV6_OPT_CLIENTID
),
169 .clid_len
= htons(assign
->clid_len
),
172 struct interface
*iface
= assign
->iface
;
174 odhcpd_get_mac(iface
, reconf_msg
.mac
);
175 memcpy(reconf_msg
.clid_data
, assign
->clid_data
, assign
->clid_len
);
176 struct iovec iov
= {&reconf_msg
, sizeof(reconf_msg
) - 128 + assign
->clid_len
};
179 uint8_t secretbytes
[64];
180 memset(secretbytes
, 0, sizeof(secretbytes
));
181 memcpy(secretbytes
, assign
->key
, sizeof(assign
->key
));
183 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
184 secretbytes
[i
] ^= 0x36;
187 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
188 md5_hash(iov
.iov_base
, iov
.iov_len
, &md5
);
189 md5_end(reconf_msg
.auth
.key
, &md5
);
191 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
192 secretbytes
[i
] ^= 0x36;
193 secretbytes
[i
] ^= 0x5c;
197 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
198 md5_hash(reconf_msg
.auth
.key
, 16, &md5
);
199 md5_end(reconf_msg
.auth
.key
, &md5
);
201 return odhcpd_send(iface
->dhcpv6_event
.uloop
.fd
, &assign
->peer
, &iov
, 1, iface
);
204 static void dhcpv6_ia_free_assignment(struct dhcp_assignment
*a
)
206 if (a
->managed_sock
.fd
.registered
) {
207 ustream_free(&a
->managed_sock
.stream
);
208 close(a
->managed_sock
.fd
.fd
);
211 if ((a
->flags
& OAF_BOUND
) && (a
->flags
& OAF_DHCPV6_PD
))
212 apply_lease(a
, false);
220 void dhcpv6_ia_enum_addrs(struct interface
*iface
, struct dhcp_assignment
*c
,
221 time_t now
, dhcpv6_binding_cb_handler_t func
, void *arg
)
223 struct odhcpd_ipaddr
*addrs
= (c
->managed
) ? c
->managed
: iface
->addr6
;
224 size_t addrlen
= (c
->managed
) ? (size_t)c
->managed_size
: iface
->addr6_len
;
225 size_t m
= get_preferred_addr(addrs
, addrlen
);
227 for (size_t i
= 0; i
< addrlen
; ++i
) {
228 struct in6_addr addr
;
229 uint32_t pref
, valid
;
230 int prefix
= c
->managed
? addrs
[i
].prefix
: c
->length
;
232 if (!valid_addr(&addrs
[i
], now
))
235 /* Filter Out Prefixes */
236 if (ADDR_MATCH_PIO_FILTER(&addrs
[i
], iface
)) {
237 char addrbuf
[INET6_ADDRSTRLEN
];
238 syslog(LOG_INFO
, "Address %s filtered out on %s",
239 inet_ntop(AF_INET6
, &addrs
[i
].addr
.in6
, addrbuf
, sizeof(addrbuf
)),
244 addr
= addrs
[i
].addr
.in6
;
245 pref
= addrs
[i
].preferred
;
246 valid
= addrs
[i
].valid
;
248 if (c
->flags
& OAF_DHCPV6_NA
) {
249 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
))
252 addr
.s6_addr32
[2] = htonl(c
->assigned_host_id
>> 32);
253 addr
.s6_addr32
[3] = htonl(c
->assigned_host_id
& UINT32_MAX
);
255 if (!valid_prefix_length(c
, addrs
[i
].prefix
))
258 addr
.s6_addr32
[1] |= htonl(c
->assigned_subnet_id
);
259 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
262 if (pref
> (uint32_t)c
->preferred_until
)
263 pref
= c
->preferred_until
;
265 if (pref
> (uint32_t)c
->valid_until
)
266 pref
= c
->valid_until
;
268 if (pref
!= UINT32_MAX
)
271 if (valid
> (uint32_t)c
->valid_until
)
272 valid
= c
->valid_until
;
274 if (valid
!= UINT32_MAX
)
277 func(&addr
, prefix
, pref
, valid
, arg
);
284 struct dhcp_assignment
*c
;
285 struct interface
*iface
;
291 static void dhcpv6_write_ia_addr(struct in6_addr
*addr
, int prefix
, _unused
uint32_t pref
,
292 _unused
uint32_t valid
, void *arg
)
294 struct write_ctxt
*ctxt
= (struct write_ctxt
*)arg
;
295 char ipbuf
[INET6_ADDRSTRLEN
];
297 inet_ntop(AF_INET6
, addr
, ipbuf
, sizeof(ipbuf
) - 1);
299 if ((ctxt
->c
->flags
& OAF_DHCPV6_NA
) && ctxt
->c
->hostname
&&
300 !(ctxt
->c
->flags
& OAF_BROKEN_HOSTNAME
)) {
301 fputs(ipbuf
, ctxt
->fp
);
304 if (dn_expand(ctxt
->iface
->search
, ctxt
->iface
->search
+ ctxt
->iface
->search_len
,
305 ctxt
->iface
->search
, b
, sizeof(b
)) > 0)
306 fprintf(ctxt
->fp
, "\t%s.%s", ctxt
->c
->hostname
, b
);
308 fprintf(ctxt
->fp
, "\t%s\n", ctxt
->c
->hostname
);
309 md5_hash(ipbuf
, strlen(ipbuf
), &ctxt
->md5
);
310 md5_hash(ctxt
->c
->hostname
, strlen(ctxt
->c
->hostname
), &ctxt
->md5
);
313 ctxt
->buf_idx
+= snprintf(ctxt
->buf
+ ctxt
->buf_idx
,ctxt
->buf_len
- ctxt
->buf_idx
,
314 "%s/%d ", ipbuf
, prefix
);
317 void dhcpv6_ia_write_statefile(void)
319 struct write_ctxt ctxt
;
321 md5_begin(&ctxt
.md5
);
323 if (config
.dhcp_statefile
) {
324 unsigned statefile_strlen
= strlen(config
.dhcp_statefile
) + 1;
325 unsigned tmp_statefile_strlen
= statefile_strlen
+ 1; /* space for . */
326 char *tmp_statefile
= alloca(tmp_statefile_strlen
);
329 char *base_statefile
;
330 char *pdir_statefile
;
331 char *pbase_statefile
;
333 time_t now
= odhcpd_time(), wall_time
= time(NULL
);
337 dir_statefile
= strndup(config
.dhcp_statefile
, statefile_strlen
);
338 base_statefile
= strndup(config
.dhcp_statefile
, statefile_strlen
);
340 pdir_statefile
= dirname(dir_statefile
);
341 pbase_statefile
= basename(base_statefile
);
343 snprintf(tmp_statefile
, tmp_statefile_strlen
, "%s/.%s", pdir_statefile
, pbase_statefile
);
346 free(base_statefile
);
348 fd
= open(tmp_statefile
, O_CREAT
| O_WRONLY
| O_CLOEXEC
, 0644);
352 ret
= lockf(fd
, F_LOCK
, 0);
358 if (ftruncate(fd
, 0) < 0) {}
360 ctxt
.fp
= fdopen(fd
, "w");
367 ctxt
.buf_len
= sizeof(leasebuf
);
369 avl_for_each_element(&interfaces
, ctxt
.iface
, avl
) {
370 if (ctxt
.iface
->dhcpv6
!= MODE_SERVER
&&
371 ctxt
.iface
->dhcpv4
!= MODE_SERVER
)
374 if (ctxt
.iface
->dhcpv6
== MODE_SERVER
) {
375 list_for_each_entry(ctxt
.c
, &ctxt
.iface
->ia_assignments
, head
) {
376 if (!(ctxt
.c
->flags
& OAF_BOUND
) || ctxt
.c
->managed_size
< 0)
381 odhcpd_hexlify(duidbuf
, ctxt
.c
->clid_data
, ctxt
.c
->clid_len
);
383 /* iface DUID iaid hostname lifetime assigned_host_id length [addrs...] */
384 ctxt
.buf_idx
= snprintf(ctxt
.buf
, ctxt
.buf_len
, "# %s %s %x %s%s %"PRId64
" ",
385 ctxt
.iface
->ifname
, duidbuf
, ntohl(ctxt
.c
->iaid
),
386 (ctxt
.c
->flags
& OAF_BROKEN_HOSTNAME
) ? "broken\\x20" : "",
387 (ctxt
.c
->hostname
? ctxt
.c
->hostname
: "-"),
388 (ctxt
.c
->valid_until
> now
?
389 (int64_t)(ctxt
.c
->valid_until
- now
+ wall_time
) :
390 (INFINITE_VALID(ctxt
.c
->valid_until
) ? -1 : 0)));
392 if (ctxt
.c
->flags
& OAF_DHCPV6_NA
)
393 ctxt
.buf_idx
+= snprintf(ctxt
.buf
+ ctxt
.buf_idx
, ctxt
.buf_len
- ctxt
.buf_idx
,
394 "%" PRIx64
" %u ", ctxt
.c
->assigned_host_id
, (unsigned)ctxt
.c
->length
);
396 ctxt
.buf_idx
+= snprintf(ctxt
.buf
+ ctxt
.buf_idx
, ctxt
.buf_len
- ctxt
.buf_idx
,
397 "%" PRIx32
" %u ", ctxt
.c
->assigned_subnet_id
, (unsigned)ctxt
.c
->length
);
399 if (INFINITE_VALID(ctxt
.c
->valid_until
) || ctxt
.c
->valid_until
> now
)
400 dhcpv6_ia_enum_addrs(ctxt
.iface
, ctxt
.c
, now
,
401 dhcpv6_write_ia_addr
, &ctxt
);
403 ctxt
.buf
[ctxt
.buf_idx
- 1] = '\n';
404 fwrite(ctxt
.buf
, 1, ctxt
.buf_idx
, ctxt
.fp
);
408 if (ctxt
.iface
->dhcpv4
== MODE_SERVER
) {
409 struct dhcp_assignment
*c
;
411 list_for_each_entry(c
, &ctxt
.iface
->dhcpv4_assignments
, head
) {
412 if (!(c
->flags
& OAF_BOUND
))
415 char ipbuf
[INET6_ADDRSTRLEN
];
417 odhcpd_hexlify(duidbuf
, c
->hwaddr
, sizeof(c
->hwaddr
));
419 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
420 ctxt
.buf_idx
= snprintf(ctxt
.buf
, ctxt
.buf_len
, "# %s %s ipv4 %s%s %"PRId64
" %x 32 ",
421 ctxt
.iface
->ifname
, duidbuf
,
422 (c
->flags
& OAF_BROKEN_HOSTNAME
) ? "broken\\x20" : "",
423 (c
->hostname
? c
->hostname
: "-"),
424 (c
->valid_until
> now
?
425 (int64_t)(c
->valid_until
- now
+ wall_time
) :
426 (INFINITE_VALID(c
->valid_until
) ? -1 : 0)),
429 struct in_addr addr
= {.s_addr
= c
->addr
};
430 inet_ntop(AF_INET
, &addr
, ipbuf
, sizeof(ipbuf
) - 1);
432 if (c
->hostname
&& !(c
->flags
& OAF_BROKEN_HOSTNAME
)) {
433 fputs(ipbuf
, ctxt
.fp
);
436 if (dn_expand(ctxt
.iface
->search
,
437 ctxt
.iface
->search
+ ctxt
.iface
->search_len
,
438 ctxt
.iface
->search
, b
, sizeof(b
)) > 0)
439 fprintf(ctxt
.fp
, "\t%s.%s", c
->hostname
, b
);
441 fprintf(ctxt
.fp
, "\t%s\n", c
->hostname
);
442 md5_hash(ipbuf
, strlen(ipbuf
), &ctxt
.md5
);
443 md5_hash(c
->hostname
, strlen(c
->hostname
), &ctxt
.md5
);
446 ctxt
.buf_idx
+= snprintf(ctxt
.buf
+ ctxt
.buf_idx
,
447 ctxt
.buf_len
- ctxt
.buf_idx
,
449 ctxt
.buf
[ctxt
.buf_idx
- 1] = '\n';
450 fwrite(ctxt
.buf
, 1, ctxt
.buf_idx
, ctxt
.fp
);
458 md5_end(newmd5
, &ctxt
.md5
);
460 if (memcmp(newmd5
, statemd5
, sizeof(newmd5
))) {
461 memcpy(statemd5
, newmd5
, sizeof(statemd5
));
462 rename(tmp_statefile
, config
.dhcp_statefile
);
464 if (config
.dhcp_cb
) {
465 char *argv
[2] = {config
.dhcp_cb
, NULL
};
467 execv(argv
[0], argv
);
472 unlink(tmp_statefile
);
477 static void __apply_lease(struct dhcp_assignment
*a
,
478 struct odhcpd_ipaddr
*addrs
, ssize_t addr_len
, bool add
)
480 if (a
->flags
& OAF_DHCPV6_NA
)
483 for (ssize_t i
= 0; i
< addr_len
; ++i
) {
484 struct in6_addr prefix
;
486 if (ADDR_MATCH_PIO_FILTER(&addrs
[i
], a
->iface
))
489 prefix
= addrs
[i
].addr
.in6
;
490 prefix
.s6_addr32
[1] |= htonl(a
->assigned_subnet_id
);
491 prefix
.s6_addr32
[2] = prefix
.s6_addr32
[3] = 0;
492 netlink_setup_route(&prefix
, (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
493 a
->iface
->ifindex
, &a
->peer
.sin6_addr
, 1024, add
);
497 static void apply_lease(struct dhcp_assignment
*a
, bool add
)
499 struct interface
*iface
= a
->iface
;
500 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->addr6
;
501 ssize_t addrlen
= (a
->managed
) ? a
->managed_size
: (ssize_t
)iface
->addr6_len
;
503 __apply_lease(a
, addrs
, addrlen
, add
);
506 /* Set border assignment size based on the IPv6 address prefixes */
507 static void set_border_assignment_size(struct interface
*iface
, struct dhcp_assignment
*b
)
509 time_t now
= odhcpd_time();
512 for (size_t i
= 0; i
< iface
->addr6_len
; ++i
) {
513 struct odhcpd_ipaddr
*addr
= &iface
->addr6
[i
];
515 if (ADDR_MATCH_PIO_FILTER(addr
, iface
))
518 if (addr
->preferred
> (uint32_t)now
&&
520 addr
->prefix
> minprefix
)
521 minprefix
= addr
->prefix
;
524 if (minprefix
> 32 && minprefix
<= 64)
525 b
->assigned_subnet_id
= 1U << (64 - minprefix
);
527 b
->assigned_subnet_id
= 0;
530 /* More data was received from TCP connection */
531 static void managed_handle_pd_data(struct ustream
*s
, _unused
int bytes_new
)
533 struct ustream_fd
*fd
= container_of(s
, struct ustream_fd
, stream
);
534 struct dhcp_assignment
*c
= container_of(fd
, struct dhcp_assignment
, managed_sock
);
535 time_t now
= odhcpd_time();
536 bool first
= c
->managed_size
< 0;
540 char *data
= ustream_get_read_buf(s
, &pending
);
541 char *end
= memmem(data
, pending
, "\n\n", 2);
550 if (c
->accept_reconf
)
554 for (char *line
= strtok_r(data
, "\n", &saveptr
); line
; line
= strtok_r(NULL
, "\n", &saveptr
)) {
555 c
->managed
= realloc(c
->managed
, (c
->managed_size
+ 1) * sizeof(*c
->managed
));
556 struct odhcpd_ipaddr
*n
= &c
->managed
[c
->managed_size
];
558 char *saveptr2
, *x
= strtok_r(line
, "/", &saveptr2
);
559 if (!x
|| inet_pton(AF_INET6
, x
, &n
->addr
) < 1)
562 x
= strtok_r(NULL
, ",", &saveptr2
);
563 if (sscanf(x
, "%hhu", &n
->prefix
) < 1)
566 x
= strtok_r(NULL
, ",", &saveptr2
);
567 if (sscanf(x
, "%u", &n
->preferred
) < 1)
570 x
= strtok_r(NULL
, ",", &saveptr2
);
571 if (sscanf(x
, "%u", &n
->valid
) < 1)
574 if (n
->preferred
> n
->valid
)
577 if (UINT32_MAX
- now
< n
->preferred
)
578 n
->preferred
= UINT32_MAX
;
582 if (UINT32_MAX
- now
< n
->valid
)
583 n
->valid
= UINT32_MAX
;
592 ustream_consume(s
, end
- data
);
595 if (first
&& c
->managed_size
== 0)
598 c
->valid_until
= now
+ 150;
602 /* TCP transmission has ended, either because of success or timeout or other error */
603 static void managed_handle_pd_done(struct ustream
*s
)
605 struct ustream_fd
*fd
= container_of(s
, struct ustream_fd
, stream
);
606 struct dhcp_assignment
*c
= container_of(fd
, struct dhcp_assignment
, managed_sock
);
608 c
->valid_until
= odhcpd_time() + 15;
612 if (c
->accept_reconf
)
616 static bool assign_pd(struct interface
*iface
, struct dhcp_assignment
*assign
)
618 struct dhcp_assignment
*c
;
620 if (iface
->dhcpv6_pd_manager
[0]) {
621 int fd
= usock(USOCK_UNIX
| USOCK_TCP
, iface
->dhcpv6_pd_manager
, NULL
);
623 struct pollfd pfd
= { .fd
= fd
, .events
= POLLIN
};
626 odhcpd_hexlify(iaidbuf
, assign
->clid_data
, assign
->clid_len
);
628 assign
->managed_sock
.stream
.notify_read
= managed_handle_pd_data
;
629 assign
->managed_sock
.stream
.notify_state
= managed_handle_pd_done
;
630 ustream_fd_init(&assign
->managed_sock
, fd
);
631 ustream_printf(&assign
->managed_sock
.stream
, "%s,%x\n::/%d,0,0\n\n",
632 iaidbuf
, assign
->iaid
, assign
->length
);
633 ustream_write_pending(&assign
->managed_sock
.stream
);
634 assign
->managed_size
= -1;
636 assign
->valid_until
= odhcpd_time() + 15;
638 list_add(&assign
->head
, &iface
->ia_assignments
);
640 /* Wait initial period of up to 250ms for immediate assignment */
641 if (poll(&pfd
, 1, 250) < 0) {
642 syslog(LOG_ERR
, "poll(): %m");
646 managed_handle_pd_data(&assign
->managed_sock
.stream
, 0);
648 if (fcntl(fd
, F_GETFL
) >= 0 && assign
->managed_size
> 0)
653 } else if (iface
->addr6_len
< 1)
656 /* Try honoring the hint first */
657 uint32_t current
= 1, asize
= (1 << (64 - assign
->length
)) - 1;
658 if (assign
->assigned_subnet_id
) {
659 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
660 if (c
->flags
& OAF_DHCPV6_NA
)
663 if (assign
->assigned_subnet_id
>= current
&& assign
->assigned_subnet_id
+ asize
< c
->assigned_subnet_id
) {
664 list_add_tail(&assign
->head
, &c
->head
);
666 if (assign
->flags
& OAF_BOUND
)
667 apply_lease(assign
, true);
672 current
= (c
->assigned_subnet_id
+ (1 << (64 - c
->length
)));
676 /* Fallback to a variable assignment */
678 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
679 if (c
->flags
& OAF_DHCPV6_NA
)
682 current
= (current
+ asize
) & (~asize
);
684 if (current
+ asize
< c
->assigned_subnet_id
) {
685 assign
->assigned_subnet_id
= current
;
686 list_add_tail(&assign
->head
, &c
->head
);
688 if (assign
->flags
& OAF_BOUND
)
689 apply_lease(assign
, true);
694 current
= (c
->assigned_subnet_id
+ (1 << (64 - c
->length
)));
700 /* Check iid against reserved IPv6 interface identifiers.
702 http://www.iana.org/assignments/ipv6-interface-ids */
703 static bool is_reserved_ipv6_iid(uint64_t iid
)
705 if (iid
== 0x0000000000000000)
706 /* Subnet-Router Anycast [RFC4291] */
709 if ((iid
& 0xFFFFFFFFFF000000) == 0x02005EFFFE000000)
710 /* Reserved IPv6 Interface Identifiers corresponding
711 to the IANA Ethernet Block [RFC4291] */
714 if ((iid
& 0xFFFFFFFFFFFFFF80) == 0xFDFFFFFFFFFFFF80)
715 /* Reserved Subnet Anycast Addresses [RFC2526] */
721 static bool assign_na(struct interface
*iface
, struct dhcp_assignment
*a
)
723 struct dhcp_assignment
*c
;
726 /* Preconfigured assignment by static lease */
727 if (a
->assigned_host_id
) {
728 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
729 if (!(c
->flags
& OAF_DHCPV6_NA
) || c
->assigned_host_id
> a
->assigned_host_id
) {
730 list_add_tail(&a
->head
, &c
->head
);
732 } else if (c
->assigned_host_id
== a
->assigned_host_id
)
737 /* Seed RNG with checksum of DUID */
738 for (size_t i
= 0; i
< a
->clid_len
; ++i
)
739 seed
+= a
->clid_data
[i
];
742 /* Try to assign up to 100x */
743 for (size_t i
= 0; i
< 100; ++i
) {
746 if (iface
->dhcpv6_hostid_len
> 32) {
749 if (iface
->dhcpv6_hostid_len
>= 64)
750 mask_high
= UINT32_MAX
;
752 mask_high
= (1 << (iface
->dhcpv6_hostid_len
- 32)) - 1;
755 try = (uint32_t)random();
756 try |= (uint64_t)((uint32_t)random() & mask_high
) << 32;
757 } while (try < 0x100);
761 if (iface
->dhcpv6_hostid_len
== 32)
762 mask_low
= UINT32_MAX
;
764 mask_low
= (1 << iface
->dhcpv6_hostid_len
) - 1;
765 do try = ((uint32_t)random()) & mask_low
; while (try < 0x100);
768 if (is_reserved_ipv6_iid(try))
771 if (config_find_lease_by_hostid(try))
774 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
775 if (!(c
->flags
& OAF_DHCPV6_NA
) || c
->assigned_host_id
> try) {
776 a
->assigned_host_id
= try;
777 list_add_tail(&a
->head
, &c
->head
);
779 } else if (c
->assigned_host_id
== try)
787 static void handle_addrlist_change(struct netevent_handler_info
*info
)
789 struct interface
*iface
= info
->iface
;
790 struct dhcp_assignment
*c
, *d
, *border
= list_last_entry(
791 &iface
->ia_assignments
, struct dhcp_assignment
, head
);
792 struct list_head reassign
= LIST_HEAD_INIT(reassign
);
793 time_t now
= odhcpd_time();
795 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
796 if ((c
->flags
& OAF_DHCPV6_PD
) && !(iface
->ra_flags
& ND_RA_FLAG_MANAGED
)
797 && (c
->flags
& OAF_BOUND
))
798 __apply_lease(c
, info
->addrs_old
.addrs
,
799 info
->addrs_old
.len
, false);
802 set_border_assignment_size(iface
, border
);
804 list_for_each_entry_safe(c
, d
, &iface
->ia_assignments
, head
) {
805 if (c
->clid_len
== 0 ||
806 !(c
->flags
& OAF_DHCPV6_PD
) ||
807 (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
< now
) ||
811 if (c
->assigned_subnet_id
>= border
->assigned_subnet_id
)
812 list_move(&c
->head
, &reassign
);
813 else if (c
->flags
& OAF_BOUND
)
814 apply_lease(c
, true);
816 if (c
->accept_reconf
&& c
->reconf_cnt
== 0) {
817 struct dhcp_assignment
*a
;
821 /* Leave all other assignments of that client alone */
822 list_for_each_entry(a
, &iface
->ia_assignments
, head
)
823 if (a
!= c
&& a
->clid_len
== c
->clid_len
&&
824 !memcmp(a
->clid_data
, c
->clid_data
, a
->clid_len
))
825 a
->reconf_cnt
= INT_MAX
;
829 while (!list_empty(&reassign
)) {
830 c
= list_first_entry(&reassign
, struct dhcp_assignment
, head
);
831 list_del_init(&c
->head
);
832 if (!assign_pd(iface
, c
))
836 dhcpv6_ia_write_statefile();
839 static void reconf_timeout_cb(struct uloop_timeout
*event
)
841 struct dhcp_assignment
*a
= container_of(event
, struct dhcp_assignment
, reconf_timer
);
843 if (a
->reconf_cnt
> 0 && a
->reconf_cnt
< DHCPV6_REC_MAX_RC
) {
845 uloop_timeout_set(&a
->reconf_timer
,
846 DHCPV6_REC_TIMEOUT
<< a
->reconf_cnt
);
852 static void start_reconf(struct dhcp_assignment
*a
)
854 uloop_timeout_set(&a
->reconf_timer
,
855 DHCPV6_REC_TIMEOUT
<< a
->reconf_cnt
);
856 a
->reconf_timer
.cb
= reconf_timeout_cb
;
862 static void stop_reconf(struct dhcp_assignment
*a
)
864 uloop_timeout_cancel(&a
->reconf_timer
);
866 a
->reconf_timer
.cb
= NULL
;
869 static void valid_until_cb(struct uloop_timeout
*event
)
871 struct interface
*iface
;
872 time_t now
= odhcpd_time();
874 avl_for_each_element(&interfaces
, iface
, avl
) {
875 struct dhcp_assignment
*a
, *n
;
877 if (iface
->dhcpv6
!= MODE_SERVER
)
880 list_for_each_entry_safe(a
, n
, &iface
->ia_assignments
, head
) {
881 if (a
->clid_len
> 0 && !INFINITE_VALID(a
->valid_until
) && a
->valid_until
< now
)
885 uloop_timeout_set(event
, 1000);
888 static size_t build_ia(uint8_t *buf
, size_t buflen
, uint16_t status
,
889 const struct dhcpv6_ia_hdr
*ia
, struct dhcp_assignment
*a
,
890 struct interface
*iface
, bool request
)
892 struct dhcpv6_ia_hdr o_ia
= {
899 size_t ia_len
= sizeof(o_ia
);
900 time_t now
= odhcpd_time();
906 struct __attribute__((packed
)) {
911 .type
= htons(DHCPV6_OPT_STATUS
),
912 .len
= htons(sizeof(o_status
) - 4),
913 .val
= htons(status
),
916 memcpy(buf
+ ia_len
, &o_status
, sizeof(o_status
));
917 ia_len
+= sizeof(o_status
);
919 o_ia
.len
= htons(ia_len
- 4);
920 memcpy(buf
, &o_ia
, sizeof(o_ia
));
926 uint32_t leasetime
, pref
;
929 leasetime
= a
->leasetime
;
932 leasetime
= iface
->dhcp_leasetime
;
933 pref
= iface
->preferred_lifetime
;
936 uint32_t valid
= leasetime
;
938 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->addr6
;
939 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->addr6_len
;
940 size_t m
= get_preferred_addr(addrs
, addrlen
);
942 for (size_t i
= 0; i
< addrlen
; ++i
) {
943 uint32_t prefix_pref
, prefix_valid
;
945 if (!valid_addr(&addrs
[i
], now
))
948 /* Filter Out Prefixes */
949 if (ADDR_MATCH_PIO_FILTER(&addrs
[i
], iface
)) {
950 char addrbuf
[INET6_ADDRSTRLEN
];
951 syslog(LOG_INFO
, "Address %s filtered out on %s",
952 inet_ntop(AF_INET6
, &addrs
[i
].addr
.in6
, addrbuf
, sizeof(addrbuf
)),
957 prefix_pref
= addrs
[i
].preferred
;
958 prefix_valid
= addrs
[i
].valid
;
960 if (prefix_pref
!= UINT32_MAX
)
963 if (prefix_pref
> pref
)
966 if (prefix_valid
!= UINT32_MAX
)
969 if (prefix_valid
> leasetime
)
970 prefix_valid
= leasetime
;
972 if (prefix_pref
> prefix_valid
)
973 prefix_pref
= prefix_valid
;
975 if (a
->flags
& OAF_DHCPV6_PD
) {
976 struct dhcpv6_ia_prefix o_ia_p
= {
977 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
978 .len
= htons(sizeof(o_ia_p
) - 4),
979 .preferred
= htonl(prefix_pref
),
980 .valid
= htonl(prefix_valid
),
981 .prefix
= (a
->managed_size
) ? addrs
[i
].prefix
: a
->length
,
982 .addr
= addrs
[i
].addr
.in6
,
985 o_ia_p
.addr
.s6_addr32
[1] |= htonl(a
->assigned_subnet_id
);
986 o_ia_p
.addr
.s6_addr32
[2] = o_ia_p
.addr
.s6_addr32
[3] = 0;
988 if (!valid_prefix_length(a
, addrs
[i
].prefix
))
991 if (buflen
< ia_len
+ sizeof(o_ia_p
))
994 memcpy(buf
+ ia_len
, &o_ia_p
, sizeof(o_ia_p
));
995 ia_len
+= sizeof(o_ia_p
);
998 if (a
->flags
& OAF_DHCPV6_NA
) {
999 struct dhcpv6_ia_addr o_ia_a
= {
1000 .type
= htons(DHCPV6_OPT_IA_ADDR
),
1001 .len
= htons(sizeof(o_ia_a
) - 4),
1002 .addr
= addrs
[i
].addr
.in6
,
1003 .preferred
= htonl(prefix_pref
),
1004 .valid
= htonl(prefix_valid
)
1007 o_ia_a
.addr
.s6_addr32
[2] = htonl(a
->assigned_host_id
>> 32);
1008 o_ia_a
.addr
.s6_addr32
[3] = htonl(a
->assigned_host_id
& UINT32_MAX
);
1010 if (!ADDR_ENTRY_VALID_IA_ADDR(iface
, i
, m
, addrs
))
1013 if (buflen
< ia_len
+ sizeof(o_ia_a
))
1016 memcpy(buf
+ ia_len
, &o_ia_a
, sizeof(o_ia_a
));
1017 ia_len
+= sizeof(o_ia_a
);
1020 /* Calculate T1 / T2 based on non-deprecated addresses */
1021 if (prefix_pref
> 0) {
1022 if (prefix_pref
< pref
)
1025 if (prefix_valid
< valid
)
1026 valid
= prefix_valid
;
1030 if (!INFINITE_VALID(a
->valid_until
))
1031 /* UINT32_MAX is considered as infinite leasetime */
1032 a
->valid_until
= (valid
== UINT32_MAX
) ? 0 : valid
+ now
;
1034 if (!INFINITE_VALID(a
->preferred_until
))
1035 /* UINT32_MAX is considered as infinite leasetime */
1036 a
->preferred_until
= (pref
== UINT32_MAX
) ? 0 : pref
+ now
;
1038 o_ia
.t1
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 5 / 10);
1039 o_ia
.t2
= htonl((pref
== UINT32_MAX
) ? pref
: pref
* 8 / 10);
1049 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
1050 uint16_t otype
, olen
;
1052 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
1053 struct dhcpv6_ia_prefix
*ia_p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
1054 struct dhcpv6_ia_addr
*ia_a
= (struct dhcpv6_ia_addr
*)&odata
[-4];
1057 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*ia_p
) - 4) &&
1058 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*ia_a
) - 4))
1062 struct odhcpd_ipaddr
*addrs
= (a
->managed
) ? a
->managed
: iface
->addr6
;
1063 size_t addrlen
= (a
->managed
) ? (size_t)a
->managed_size
: iface
->addr6_len
;
1065 for (size_t i
= 0; i
< addrlen
; ++i
) {
1066 struct in6_addr addr
;
1068 if (!valid_addr(&addrs
[i
], now
))
1071 if (!valid_prefix_length(a
, addrs
[i
].prefix
))
1074 if (ADDR_MATCH_PIO_FILTER(&addrs
[i
], iface
))
1077 addr
= addrs
[i
].addr
.in6
;
1078 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
1079 addr
.s6_addr32
[1] |= htonl(a
->assigned_subnet_id
);
1080 addr
.s6_addr32
[2] = addr
.s6_addr32
[3] = 0;
1082 if (!memcmp(&ia_p
->addr
, &addr
, sizeof(addr
)) &&
1083 ia_p
->prefix
== ((a
->managed
) ? addrs
[i
].prefix
: a
->length
))
1086 addr
.s6_addr32
[2] = htonl(a
->assigned_host_id
>> 32);
1087 addr
.s6_addr32
[3] = htonl(a
->assigned_host_id
& UINT32_MAX
);
1089 if (!memcmp(&ia_a
->addr
, &addr
, sizeof(addr
)))
1096 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1097 struct dhcpv6_ia_prefix o_ia_p
= {
1098 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
1099 .len
= htons(sizeof(o_ia_p
) - 4),
1102 .prefix
= ia_p
->prefix
,
1106 if (buflen
< ia_len
+ sizeof(o_ia_p
))
1109 memcpy(buf
+ ia_len
, &o_ia_p
, sizeof(o_ia_p
));
1110 ia_len
+= sizeof(o_ia_p
);
1112 struct dhcpv6_ia_addr o_ia_a
= {
1113 .type
= htons(DHCPV6_OPT_IA_ADDR
),
1114 .len
= htons(sizeof(o_ia_a
) - 4),
1120 if (buflen
< ia_len
+ sizeof(o_ia_a
))
1123 memcpy(buf
+ ia_len
, &o_ia_a
, sizeof(o_ia_a
));
1124 ia_len
+= sizeof(o_ia_a
);
1130 o_ia
.len
= htons(ia_len
- 4);
1131 memcpy(buf
, &o_ia
, sizeof(o_ia
));
1141 static void dhcpv6_log_ia_addr(struct in6_addr
*addr
, int prefix
, _unused
uint32_t pref
,
1142 _unused
uint32_t valid
, void *arg
)
1144 struct log_ctxt
*ctxt
= (struct log_ctxt
*)arg
;
1145 char addrbuf
[INET6_ADDRSTRLEN
];
1147 inet_ntop(AF_INET6
, addr
, addrbuf
, sizeof(addrbuf
));
1148 ctxt
->buf_idx
+= snprintf(ctxt
->buf
+ ctxt
->buf_idx
, ctxt
->buf_len
- ctxt
->buf_idx
,
1149 "%s/%d ", addrbuf
, prefix
);
1152 static void dhcpv6_log(uint8_t msgtype
, struct interface
*iface
, time_t now
,
1153 const char *duidbuf
, bool is_pd
, struct dhcp_assignment
*a
, int code
)
1155 const char *type
= "UNKNOWN";
1156 const char *status
= "UNKNOWN";
1159 case DHCPV6_MSG_SOLICIT
:
1162 case DHCPV6_MSG_REQUEST
:
1165 case DHCPV6_MSG_CONFIRM
:
1168 case DHCPV6_MSG_RENEW
:
1171 case DHCPV6_MSG_REBIND
:
1174 case DHCPV6_MSG_RELEASE
:
1177 case DHCPV6_MSG_DECLINE
:
1183 case DHCPV6_STATUS_OK
:
1186 case DHCPV6_STATUS_NOADDRSAVAIL
:
1187 status
= "no addresses available";
1189 case DHCPV6_STATUS_NOBINDING
:
1190 status
= "no binding";
1192 case DHCPV6_STATUS_NOTONLINK
:
1193 status
= "not on-link";
1195 case DHCPV6_STATUS_NOPREFIXAVAIL
:
1196 status
= "no prefix available";
1200 char leasebuf
[256] = "";
1203 struct log_ctxt ctxt
= {.buf
= leasebuf
,
1204 .buf_len
= sizeof(leasebuf
),
1207 dhcpv6_ia_enum_addrs(iface
, a
, now
, dhcpv6_log_ia_addr
, &ctxt
);
1210 syslog(LOG_INFO
, "DHCPV6 %s %s from %s on %s: %s %s", type
, (is_pd
) ? "IA_PD" : "IA_NA",
1211 duidbuf
, iface
->name
, status
, leasebuf
);
1214 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr
*ia
, struct dhcp_assignment
*a
,
1215 struct interface
*iface
)
1217 struct odhcpd_ipaddr
*addrs
= (a
&& a
->managed
) ? a
->managed
: iface
->addr6
;
1218 size_t addrlen
= (a
&& a
->managed
) ? (size_t)a
->managed_size
: iface
->addr6_len
;
1219 time_t now
= odhcpd_time();
1220 uint8_t *odata
, *end
= ((uint8_t*)ia
) + htons(ia
->len
) + 4;
1221 uint16_t otype
, olen
;
1224 dhcpv6_for_each_option((uint8_t*)&ia
[1], end
, otype
, olen
, odata
) {
1225 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&odata
[-4];
1226 struct dhcpv6_ia_addr
*n
= (struct dhcpv6_ia_addr
*)&odata
[-4];
1228 if ((otype
!= DHCPV6_OPT_IA_PREFIX
|| olen
< sizeof(*p
) - 4) &&
1229 (otype
!= DHCPV6_OPT_IA_ADDR
|| olen
< sizeof(*n
) - 4))
1233 for (size_t i
= 0; i
< addrlen
; ++i
) {
1234 if (!valid_addr(&addrs
[i
], now
))
1237 if (ADDR_MATCH_PIO_FILTER(&addrs
[i
], iface
))
1240 if (ia
->type
== htons(DHCPV6_OPT_IA_PD
)) {
1241 if (p
->prefix
< addrs
[i
].prefix
||
1242 odhcpd_bmemcmp(&p
->addr
, &addrs
[i
].addr
.in6
, addrs
[i
].prefix
))
1245 } else if (odhcpd_bmemcmp(&n
->addr
, &addrs
[i
].addr
.in6
, addrs
[i
].prefix
))
1258 ssize_t
dhcpv6_ia_handle_IAs(uint8_t *buf
, size_t buflen
, struct interface
*iface
,
1259 const struct sockaddr_in6
*addr
, const void *data
, const uint8_t *end
)
1262 struct dhcp_assignment
*first
= NULL
;
1263 const struct dhcpv6_client_header
*hdr
= data
;
1264 time_t now
= odhcpd_time();
1265 uint16_t otype
, olen
, clid_len
= 0;
1266 uint8_t *start
= (uint8_t *)&hdr
[1], *odata
;
1267 uint8_t *clid_data
= NULL
, mac
[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1268 size_t hostname_len
= 0, response_len
= 0;
1269 bool notonlink
= false, rapid_commit
= false, accept_reconf
= false;
1270 char duidbuf
[261], hostname
[256];
1272 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1273 if (otype
== DHCPV6_OPT_CLIENTID
) {
1277 if (olen
== 14 && odata
[0] == 0 && odata
[1] == 1)
1278 memcpy(mac
, &odata
[8], sizeof(mac
));
1279 else if (olen
== 10 && odata
[0] == 0 && odata
[1] == 3)
1280 memcpy(mac
, &odata
[4], sizeof(mac
));
1283 odhcpd_hexlify(duidbuf
, odata
, olen
);
1284 } else if (otype
== DHCPV6_OPT_FQDN
&& olen
>= 2 && olen
<= 255) {
1285 uint8_t fqdn_buf
[256];
1286 memcpy(fqdn_buf
, odata
, olen
);
1287 fqdn_buf
[olen
++] = 0;
1289 if (dn_expand(&fqdn_buf
[1], &fqdn_buf
[olen
], &fqdn_buf
[1], hostname
, sizeof(hostname
)) > 0)
1290 hostname_len
= strcspn(hostname
, ".");
1291 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
)
1292 accept_reconf
= true;
1293 else if (otype
== DHCPV6_OPT_RAPID_COMMIT
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
)
1294 rapid_commit
= true;
1297 if (!clid_data
|| !clid_len
|| clid_len
> 130)
1300 l
= config_find_lease_by_duid(clid_data
, clid_len
);
1302 l
= config_find_lease_by_mac(mac
);
1304 dhcpv6_for_each_option(start
, end
, otype
, olen
, odata
) {
1305 bool is_pd
= (otype
== DHCPV6_OPT_IA_PD
);
1306 bool is_na
= (otype
== DHCPV6_OPT_IA_NA
);
1307 bool ia_addr_present
= false;
1308 if (!is_pd
&& !is_na
)
1311 struct dhcpv6_ia_hdr
*ia
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
1312 size_t ia_response_len
= 0;
1313 uint8_t reqlen
= (is_pd
) ? 62 : 128;
1314 uint32_t reqhint
= 0;
1316 /* Parse request hint for IA-PD */
1319 uint16_t stype
, slen
;
1320 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1321 if (stype
!= DHCPV6_OPT_IA_PREFIX
|| slen
< sizeof(struct dhcpv6_ia_prefix
) - 4)
1324 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&sdata
[-4];
1327 reqhint
= ntohl(p
->addr
.s6_addr32
[1]);
1328 if (reqlen
> 32 && reqlen
<= 64)
1329 reqhint
&= (1U << (64 - reqlen
)) - 1;
1337 uint16_t stype
, slen
;
1338 dhcpv6_for_each_option(&ia
[1], odata
+ olen
, stype
, slen
, sdata
) {
1339 if (stype
!= DHCPV6_OPT_IA_ADDR
|| slen
< sizeof(struct dhcpv6_ia_addr
) - 4)
1342 ia_addr_present
= true;
1346 /* Find assignment */
1347 struct dhcp_assignment
*c
, *a
= NULL
;
1348 list_for_each_entry(c
, &iface
->ia_assignments
, head
) {
1349 if ((c
->clid_len
== clid_len
&& !memcmp(c
->clid_data
, clid_data
, clid_len
)) &&
1350 c
->iaid
== ia
->iaid
&& (INFINITE_VALID(c
->valid_until
) || now
< c
->valid_until
) &&
1351 ((is_pd
&& (c
->flags
& OAF_DHCPV6_PD
)) || (is_na
&& (c
->flags
& OAF_DHCPV6_NA
)))) {
1355 if (a
->flags
& OAF_BOUND
)
1356 apply_lease(a
, false);
1363 if (l
&& a
&& a
->lease
!= l
) {
1368 /* Generic message handling */
1369 uint16_t status
= DHCPV6_STATUS_OK
;
1370 if (a
&& a
->managed_size
< 0)
1373 if (hdr
->msg_type
== DHCPV6_MSG_SOLICIT
||
1374 hdr
->msg_type
== DHCPV6_MSG_REQUEST
||
1375 (hdr
->msg_type
== DHCPV6_MSG_REBIND
&& !a
)) {
1376 bool assigned
= !!a
;
1379 if ((!iface
->no_dynamic_dhcp
|| (l
&& is_na
)) &&
1380 (iface
->dhcpv6_pd
|| iface
->dhcpv6_na
)) {
1381 /* Create new binding */
1382 a
= alloc_assignment(clid_len
);
1385 a
->clid_len
= clid_len
;
1386 memcpy(a
->clid_data
, clid_data
, clid_len
);
1391 a
->assigned_host_id
= l
? l
->hostid
: 0;
1393 a
->assigned_subnet_id
= reqhint
;
1394 a
->valid_until
= now
;
1395 a
->preferred_until
= now
;
1396 a
->dhcp_free_cb
= dhcpv6_ia_free_assignment
;
1398 a
->flags
= (is_pd
? OAF_DHCPV6_PD
: OAF_DHCPV6_NA
);
1401 memcpy(a
->key
, first
->key
, sizeof(a
->key
));
1403 odhcpd_urandom(a
->key
, sizeof(a
->key
));
1405 if (is_pd
&& iface
->dhcpv6_pd
)
1406 while (!(assigned
= assign_pd(iface
, a
)) &&
1407 !a
->managed_size
&& ++a
->length
<= 64);
1408 else if (is_na
&& iface
->dhcpv6_na
)
1409 assigned
= assign_na(iface
, a
);
1411 if (l
&& assigned
) {
1412 a
->flags
|= OAF_STATIC
;
1415 a
->hostname
= strdup(l
->hostname
);
1418 a
->leasetime
= l
->leasetime
;
1420 list_add(&a
->lease_list
, &l
->assignments
);
1424 if (a
->managed_size
&& !assigned
)
1430 if (!assigned
|| iface
->addr6_len
== 0)
1431 /* Set error status */
1432 status
= (is_pd
) ? DHCPV6_STATUS_NOPREFIXAVAIL
: DHCPV6_STATUS_NOADDRSAVAIL
;
1433 else if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
&& !dhcpv6_ia_on_link(ia
, a
, iface
)) {
1434 /* Send NOTONLINK staus for the IA */
1435 status
= DHCPV6_STATUS_NOTONLINK
;
1437 } else if (accept_reconf
&& assigned
&& !first
&&
1438 hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1439 size_t handshake_len
= 4;
1441 buf
[1] = DHCPV6_OPT_RECONF_ACCEPT
;
1445 if (hdr
->msg_type
== DHCPV6_MSG_REQUEST
) {
1446 struct dhcpv6_auth_reconfigure auth
= {
1447 htons(DHCPV6_OPT_AUTH
),
1448 htons(sizeof(auth
) - 4),
1450 {htonl(time(NULL
)), htonl(++serial
)},
1454 memcpy(auth
.key
, a
->key
, sizeof(a
->key
));
1455 memcpy(buf
+ handshake_len
, &auth
, sizeof(auth
));
1456 handshake_len
+= sizeof(auth
);
1460 buf
+= handshake_len
;
1461 buflen
-= handshake_len
;
1462 response_len
+= handshake_len
;
1467 ia_response_len
= build_ia(buf
, buflen
, status
, ia
, a
, iface
,
1468 hdr
->msg_type
== DHCPV6_MSG_REBIND
? false : true);
1470 /* Was only a solicitation: mark binding for removal */
1471 if (assigned
&& hdr
->msg_type
== DHCPV6_MSG_SOLICIT
&& !rapid_commit
) {
1472 a
->flags
&= ~OAF_BOUND
;
1473 a
->flags
|= OAF_TENTATIVE
;
1475 /* Keep tentative assignment around for 60 seconds */
1476 a
->valid_until
= now
+ 60;
1478 } else if (assigned
&&
1479 ((hdr
->msg_type
== DHCPV6_MSG_SOLICIT
&& rapid_commit
) ||
1480 hdr
->msg_type
== DHCPV6_MSG_REQUEST
||
1481 hdr
->msg_type
== DHCPV6_MSG_REBIND
)) {
1482 if ((!(a
->flags
& OAF_STATIC
) || !a
->hostname
) && hostname_len
> 0) {
1483 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
1485 memcpy(a
->hostname
, hostname
, hostname_len
);
1486 a
->hostname
[hostname_len
] = 0;
1488 if (odhcpd_valid_hostname(a
->hostname
))
1489 a
->flags
&= ~OAF_BROKEN_HOSTNAME
;
1491 a
->flags
|= OAF_BROKEN_HOSTNAME
;
1494 a
->accept_reconf
= accept_reconf
;
1495 a
->flags
&= ~OAF_TENTATIVE
;
1496 a
->flags
|= OAF_BOUND
;
1497 apply_lease(a
, true);
1498 } else if (!assigned
&& a
&& a
->managed_size
== 0) {
1499 /* Cleanup failed assignment */
1503 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1504 hdr
->msg_type
== DHCPV6_MSG_RELEASE
||
1505 hdr
->msg_type
== DHCPV6_MSG_REBIND
||
1506 hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1507 if (!a
&& hdr
->msg_type
!= DHCPV6_MSG_REBIND
) {
1508 status
= DHCPV6_STATUS_NOBINDING
;
1509 ia_response_len
= build_ia(buf
, buflen
, status
, ia
, a
, iface
, false);
1510 } else if (hdr
->msg_type
== DHCPV6_MSG_RENEW
||
1511 hdr
->msg_type
== DHCPV6_MSG_REBIND
) {
1512 ia_response_len
= build_ia(buf
, buflen
, status
, ia
, a
, iface
, false);
1514 a
->flags
|= OAF_BOUND
;
1515 apply_lease(a
, true);
1517 } else if (hdr
->msg_type
== DHCPV6_MSG_RELEASE
) {
1518 a
->valid_until
= now
- 1;
1519 } else if ((a
->flags
& OAF_DHCPV6_NA
) && hdr
->msg_type
== DHCPV6_MSG_DECLINE
) {
1520 a
->flags
&= ~OAF_BOUND
;
1522 if (!(a
->flags
& OAF_STATIC
) || a
->lease
->hostid
!= a
->assigned_host_id
) {
1523 memset(a
->clid_data
, 0, a
->clid_len
);
1524 a
->valid_until
= now
+ 3600; /* Block address for 1h */
1526 a
->valid_until
= now
- 1;
1528 } else if (hdr
->msg_type
== DHCPV6_MSG_CONFIRM
) {
1529 if (ia_addr_present
&& !dhcpv6_ia_on_link(ia
, a
, iface
)) {
1534 if (!ia_addr_present
|| !a
|| !(a
->flags
& OAF_BOUND
)) {
1540 buf
+= ia_response_len
;
1541 buflen
-= ia_response_len
;
1542 response_len
+= ia_response_len
;
1543 dhcpv6_log(hdr
->msg_type
, iface
, now
, duidbuf
, is_pd
, a
, status
);
1546 switch (hdr
->msg_type
) {
1547 case DHCPV6_MSG_RELEASE
:
1548 case DHCPV6_MSG_DECLINE
:
1549 case DHCPV6_MSG_CONFIRM
:
1550 if (response_len
+ 6 < buflen
) {
1552 buf
[1] = DHCPV6_OPT_STATUS
;
1556 buf
[5] = (notonlink
) ? DHCPV6_STATUS_NOTONLINK
: DHCPV6_STATUS_OK
;
1565 dhcpv6_ia_write_statefile();
1568 return response_len
;