2 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
26 #include <sys/ioctl.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
31 #include <net/ethernet.h>
36 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
37 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
38 #define DHCPV6_CLIENT_PORT 546
39 #define DHCPV6_SERVER_PORT 547
40 #define DHCPV6_DUID_LLADDR 3
41 #define DHCPV6_REQ_DELAY 1
44 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
45 const uint8_t transaction
[3], enum dhcpv6_msg type
);
47 static time_t dhcpv6_parse_ia(void *opt
, void *end
);
49 static reply_handler dhcpv6_handle_reply
;
50 static reply_handler dhcpv6_handle_advert
;
51 static reply_handler dhcpv6_handle_rebind_reply
;
52 static reply_handler dhcpv6_handle_reconfigure
;
53 static int dhcpv6_commit_advert(uint32_t elapsed
);
57 // RFC 3315 - 5.5 Timeout and Delay values
58 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
59 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, "<POLL>",
60 dhcpv6_handle_reconfigure
, NULL
},
61 [DHCPV6_MSG_SOLICIT
] = {true, 1, 120, "SOLICIT",
62 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
63 [DHCPV6_MSG_REQUEST
] = {true, 30, 10, "REQUEST",
64 dhcpv6_handle_reply
, NULL
},
65 [DHCPV6_MSG_RENEW
] = {false, 10, 600, "RENEW",
66 dhcpv6_handle_reply
, NULL
},
67 [DHCPV6_MSG_REBIND
] = {false, 10, 600, "REBIND",
68 dhcpv6_handle_rebind_reply
, NULL
},
69 [DHCPV6_MSG_RELEASE
] = {false, 1, 600, "RELEASE", NULL
, NULL
},
70 [DHCPV6_MSG_DECLINE
] = {false, 1, 3, "DECLINE", NULL
, NULL
},
71 [DHCPV6_MSG_INFO_REQ
] = {true, 1, 120, "INFOREQ",
72 dhcpv6_handle_reply
, NULL
},
78 static int urandom_fd
= -1;
79 static int ifindex
= -1;
80 static time_t t1
= 0, t2
= 0, t3
= 0;
83 static int request_prefix
= -1;
84 static enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
;
85 static bool accept_reconfig
= false;
89 int init_dhcpv6(const char *ifname
, int request_pd
)
91 request_prefix
= request_pd
;
92 urandom_fd
= open("/dev/urandom", O_CLOEXEC
| O_RDONLY
);
96 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
100 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
101 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
))
103 ifindex
= ifr
.ifr_ifindex
;
105 // Create client DUID
106 size_t client_id_len
;
107 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
108 if (client_id_len
== 0) {
109 ioctl(sock
, SIOCGIFHWADDR
, &ifr
);
110 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
111 DHCPV6_DUID_LLADDR
, 0, 1};
112 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
114 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
115 struct ifreq ifs
[100], *ifp
, *ifend
;
118 ifc
.ifc_len
= sizeof(ifs
);
120 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
121 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
122 // If our interface doesn't have an address...
123 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
124 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
125 !memcmp(&duid
[8], zero
, 6); ifp
++) {
126 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
127 sizeof(ifr
.ifr_name
));
128 ioctl(sock
, SIOCGIFHWADDR
, &ifr
);
129 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
134 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
138 uint16_t oro
[] = {htons(DHCPV6_OPT_DNS_SERVERS
),
139 htons(DHCPV6_OPT_DNS_DOMAIN
),
140 htons(DHCPV6_OPT_NTP_SERVER
),
141 htons(DHCPV6_OPT_SIP_SERVER_A
),
142 htons(DHCPV6_OPT_SIP_SERVER_D
)};
143 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
146 // Configure IPv6-options
148 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
149 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
150 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
152 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
153 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
154 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)))
161 void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode
)
167 void dhcpv6_remove_addrs(void)
170 uint8_t *odata
, *ia_na
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
171 uint16_t otype
, olen
;
172 dhcpv6_for_each_option(ia_na
, ia_na
+ ia_na_len
, otype
, olen
, odata
) {
173 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
174 set_rtnetlink_addr(ifindex
, &addr
->addr
, 0, 0);
179 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
183 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
190 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
191 sizeof(fqdn
.data
), NULL
, NULL
);
192 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
193 fqdn
.len
= htons(fqdn_len
- 4);
199 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
203 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
207 void *ia_pd
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
208 struct dhcpv6_ia_hdr hdr_ia_pd
= {
209 htons(DHCPV6_OPT_IA_PD
),
210 htons(sizeof(hdr_ia_pd
) - 4 + ia_pd_len
),
214 struct dhcpv6_ia_prefix pref
= {
215 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
216 .len
= htons(25), .prefix
= request_prefix
219 if (ia_pd_len
== 0 && request_prefix
> 0 &&
220 (type
== DHCPV6_MSG_SOLICIT
||
221 type
== DHCPV6_MSG_REQUEST
)) {
223 ia_pd_len
= sizeof(pref
);
228 void *ia_na
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
229 struct dhcpv6_ia_hdr hdr_ia_na
= {
230 htons(DHCPV6_OPT_IA_NA
),
231 htons(sizeof(hdr_ia_na
) - 4 + ia_na_len
),
235 // Reconfigure Accept
239 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
241 // Request Information Refresh
242 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
246 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
250 uint16_t elapsed_type
;
251 uint16_t elapsed_len
;
252 uint16_t elapsed_value
;
256 type
, {trid
[0], trid
[1], trid
[2]},
257 htons(DHCPV6_OPT_ELAPSED
), htons(2),
258 htons((ecs
> 0xffff) ? 0xffff : ecs
),
259 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
262 struct iovec iov
[] = {
267 {srv_id
, srv_id_len
},
270 {&hdr_ia_na
, sizeof(hdr_ia_na
)},
272 {&hdr_ia_pd
, sizeof(hdr_ia_pd
)},
276 size_t cnt
= ARRAY_SIZE(iov
);
277 if (type
== DHCPV6_MSG_INFO_REQ
) {
279 iov
[2].iov_len
= sizeof(oro_refresh
);
280 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
281 } else if (!request_prefix
) {
285 // Disable IAs if not used
286 if (type
== DHCPV6_MSG_SOLICIT
) {
287 iov
[5].iov_len
= sizeof(reconf_accept
);
288 } else if (type
!= DHCPV6_MSG_REQUEST
) {
295 if (na_mode
== IA_MODE_NONE
)
298 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
299 0, ALL_DHCPV6_RELAYS
, ifindex
};
300 struct msghdr msg
= {&srv
, sizeof(srv
), iov
, cnt
, NULL
, 0, 0};
302 sendmsg(sock
, &msg
, 0);
306 static int64_t dhcpv6_rand_delay(int64_t time
)
309 read(urandom_fd
, &random
, sizeof(random
));
310 return (time
* (random
% 1000)) / 10000;
314 int dhcpv6_request(enum dhcpv6_msg type
)
317 uint32_t timeout
= UINT32_MAX
;
318 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
321 struct timespec ts
= {0, 0};
322 ts
.tv_nsec
= dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY
);
323 nanosleep(&ts
, NULL
);
326 if (type
== DHCPV6_MSG_RELEASE
|| type
== DHCPV6_MSG_DECLINE
)
328 else if (type
== DHCPV6_MSG_UNKNOWN
)
330 else if (type
== DHCPV6_MSG_RENEW
)
332 else if (type
== DHCPV6_MSG_REBIND
)
338 syslog(LOG_NOTICE
, "Sending %s (timeout %us)", retx
->name
, timeout
);
340 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
342 // Generate transaction ID
344 read(urandom_fd
, trid
, sizeof(trid
));
349 rto
= (rto
== 0) ? (retx
->init_timeo
* 1000 +
350 dhcpv6_rand_delay(retx
->init_timeo
* 1000)) :
351 (2 * rto
+ dhcpv6_rand_delay(rto
));
353 if (rto
>= retx
->max_timeo
* 1000)
354 rto
= retx
->max_timeo
* 1000 +
355 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
357 // Calculate end for this round and elapsed time
358 uint64_t round_end
= round_start
+ rto
;
359 elapsed
= round_start
- start
;
361 // Don't wait too long
362 if (round_end
- start
> timeout
* 1000)
363 round_end
= timeout
* 1000 + start
;
365 // Built and send package
366 if (type
!= DHCPV6_MSG_UNKNOWN
)
367 dhcpv6_send(type
, trid
, elapsed
/ 10);
370 for (; len
< 0 && round_start
< round_end
;
371 round_start
= odhcp6c_get_milli_time()) {
372 // Check for pending signal
373 if (odhcp6c_signal_is_pending())
376 // Set timeout for receiving
377 uint64_t t
= round_end
- round_start
;
378 struct timeval timeout
= {t
/ 1000, (t
% 1000) * 1000};
379 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
380 &timeout
, sizeof(timeout
));
383 len
= recv(sock
, buf
, sizeof(buf
), 0);
385 if (!dhcpv6_response_is_valid(buf
, len
, trid
, type
))
389 uint8_t *opt
= &buf
[4];
390 uint8_t *opt_end
= opt
+ len
- 4;
392 round_start
= odhcp6c_get_milli_time();
393 elapsed
= round_start
- start
;
394 syslog(LOG_NOTICE
, "Got a valid reply after "
395 "%ums", (unsigned)elapsed
);
397 if (retx
->handler_reply
)
398 len
= retx
->handler_reply(type
,
399 opt
, opt_end
, elapsed
/ 1000);
404 if (retx
->handler_finish
)
405 len
= retx
->handler_finish(elapsed
/ 1000);
406 } while (len
< 0 && elapsed
/ 1000 < timeout
);
412 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
413 const uint8_t transaction
[3], enum dhcpv6_msg type
)
415 const struct dhcpv6_header
*rep
= buf
;
416 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
417 transaction
, sizeof(rep
->tr_id
)))
418 return false; // Invalid reply
420 if (type
== DHCPV6_MSG_SOLICIT
) {
421 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
422 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
424 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
425 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
427 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
431 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
;
432 uint16_t otype
, olen
;
433 bool clientid_ok
= false, serverid_ok
= false;
435 size_t client_id_len
, server_id_len
;
436 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
437 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
439 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
)
440 if (otype
== DHCPV6_OPT_CLIENTID
)
441 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
442 &odata
[-4], client_id
, client_id_len
);
443 else if (otype
== DHCPV6_OPT_SERVERID
)
444 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
445 &odata
[-4], server_id
, server_id_len
);
447 return clientid_ok
&& (serverid_ok
|| server_id_len
== 0);
451 int dhcpv6_poll_reconfigure(void)
453 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
455 ret
= dhcpv6_request(ret
);
461 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
,
462 const void *opt
, const void *end
, uint32_t elapsed
)
464 // TODO: should verify the reconfigure message
465 uint16_t otype
, olen
;
466 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
467 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
468 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
469 odata
[0] == DHCPV6_MSG_RENEW
||
470 odata
[0] == DHCPV6_MSG_INFO_REQ
))
486 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, NULL
, NULL
, elapsed
);
491 // Collect all advertised servers
492 static int dhcpv6_handle_advert(_unused
enum dhcpv6_msg orig
,
493 const void *opt
, const void *end
, _unused
uint32_t elapsed
)
495 uint16_t olen
, otype
;
497 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0}};
499 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
500 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
501 memcpy(cand
.duid
, odata
, olen
);
502 cand
.duid_len
= olen
;
503 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2 && !odata
[0]
504 && odata
[1] == DHCPV6_NoAddrsAvail
) {
505 if (na_mode
== IA_MODE_FORCE
) {
508 cand
.has_noaddravail
= true;
509 cand
.preference
-= 1000;
511 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2 && !odata
[0]
512 && odata
[1] == DHCPV6_NoPrefixAvail
) {
513 cand
.preference
-= 2000;
514 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
515 cand
.preference
>= 0) {
516 cand
.preference
= odata
[1];
517 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
518 cand
.wants_reconfigure
= true;
519 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
) {
520 struct dhcpv6_ia_hdr
*h
= (void*)odata
;
521 uint8_t *oend
= odata
+ olen
, *d
;
522 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
523 if (otype
== DHCPV6_OPT_IA_PREFIX
)
524 cand
.preference
+= 2000;
525 else if (otype
== DHCPV6_OPT_STATUS
&&
526 olen
>= 2 && d
[0] == 0 &&
527 d
[1] == DHCPV6_NoPrefixAvail
)
528 cand
.preference
-= 2000;
533 if (cand
.duid_len
> 0)
534 odhcp6c_add_state(STATE_SERVER_CAND
, &cand
, sizeof(cand
));
540 static int dhcpv6_commit_advert(_unused
uint32_t elapsed
)
543 struct dhcpv6_server_cand
*c
= NULL
, *cand
=
544 odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
547 for (size_t i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
548 if (cand
[i
].has_noaddravail
)
549 retry
= true; // We want to try again
551 if (!c
|| c
->preference
< cand
[i
].preference
)
555 if (retry
&& na_mode
== IA_MODE_TRY
) {
556 // We give it a second try without the IA_NA
557 na_mode
= IA_MODE_NONE
;
558 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
562 uint16_t hdr
[2] = {htons(DHCPV6_OPT_SERVERID
),
564 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
565 odhcp6c_add_state(STATE_SERVER_ID
, c
->duid
, c
->duid_len
);
566 accept_reconfig
= c
->wants_reconfigure
;
569 odhcp6c_clear_state(STATE_SERVER_CAND
);
573 else if (request_prefix
|| na_mode
!= IA_MODE_NONE
)
574 return DHCPV6_STATEFUL
;
576 return DHCPV6_STATELESS
;
580 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
,
581 const void *opt
, const void *end
, uint32_t elapsed
)
583 dhcpv6_handle_advert(orig
, opt
, end
, elapsed
);
584 if (dhcpv6_commit_advert(elapsed
) < 0)
587 return dhcpv6_handle_reply(orig
, opt
, end
, elapsed
);
591 static int dhcpv6_handle_reply(_unused
enum dhcpv6_msg orig
,
592 const void *opt
, const void *end
, uint32_t elapsed
)
594 uint16_t otype
, olen
;
596 bool have_update
= false;
598 t1
= t2
= t3
= 86400;
600 size_t ia_na_len
, dns_len
, search_len
, sntp_ip_len
, sntp_dns_len
;
601 size_t sip_ip_len
, sip_fqdn_len
;
602 uint8_t *ia_na
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
604 odhcp6c_get_state(STATE_DNS
, &dns_len
);
605 odhcp6c_get_state(STATE_SEARCH
, &search_len
);
606 odhcp6c_get_state(STATE_SNTP_IP
, &sntp_ip_len
);
607 odhcp6c_get_state(STATE_SNTP_FQDN
, &sntp_dns_len
);
608 odhcp6c_get_state(STATE_SIP_IP
, &sip_ip_len
);
609 odhcp6c_get_state(STATE_SIP_FQDN
, &sip_fqdn_len
);
611 // Decrease valid and preferred lifetime of prefixes
613 uint8_t *ia_pd
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
614 dhcpv6_for_each_option(ia_pd
, ia_pd
+ ia_pd_len
, otype
, olen
, odata
) {
615 struct dhcpv6_ia_prefix
*p
= (void*)&odata
[-4];
616 uint32_t valid
= ntohl(p
->valid
);
617 if (valid
!= UINT32_MAX
)
618 p
->valid
= (valid
< elapsed
) ? 0 : htonl(valid
- elapsed
);
620 uint32_t pref
= ntohl(p
->preferred
);
621 if (pref
!= UINT32_MAX
)
622 p
->preferred
= (pref
< elapsed
) ? 0 : htonl(pref
- elapsed
);
625 // Decrease valid and preferred lifetime of addresses
626 dhcpv6_for_each_option(ia_na
, ia_na
+ ia_na_len
, otype
, olen
, odata
) {
627 struct dhcpv6_ia_addr
*p
= (void*)&odata
[-4];
628 uint32_t valid
= ntohl(p
->valid
);
629 if (valid
!= UINT32_MAX
)
630 p
->valid
= (valid
< elapsed
) ? 0 : htonl(valid
- elapsed
);
632 uint32_t pref
= ntohl(p
->preferred
);
633 if (pref
!= UINT32_MAX
)
634 p
->preferred
= (pref
< elapsed
) ? 0 : htonl(pref
- elapsed
);
637 // Parse and find all matching IAs
638 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
639 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
640 && olen
> sizeof(struct dhcpv6_ia_hdr
)) {
641 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
642 time_t l_t1
= ntohl(ia_hdr
->t1
);
643 time_t l_t2
= ntohl(ia_hdr
->t2
);
645 // Test ID and T1-T2 validity
646 if (ia_hdr
->iaid
!= 1 || l_t2
< l_t1
)
649 uint16_t stype
, slen
;
651 // Test status and bail if error
652 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
654 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2 &&
655 (sdata
[0] || sdata
[1]))
659 if (l_t1
> 0 && t1
> l_t1
)
662 if (l_t2
> 0 && t2
> l_t2
)
665 // Always report update in case we have IA_PDs so that
666 // the state-script is called with updated times
667 if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
)
670 time_t n
= dhcpv6_parse_ia(&ia_hdr
[1], odata
+ olen
);
681 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
683 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
684 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
685 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
686 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
687 uint16_t stype
, slen
;
689 // Test status and bail if error
690 dhcpv6_for_each_option(odata
, odata
+ olen
,
691 stype
, slen
, sdata
) {
692 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
693 stype
== NTP_SRV_ADDR
))
694 odhcp6c_add_state(STATE_SNTP_IP
,
696 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
697 odhcp6c_add_state(STATE_SNTP_FQDN
,
700 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
702 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
703 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
704 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
705 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
706 uint32_t refresh
= ntohl(*((uint32_t*)odata
));
707 if (refresh
< (uint32_t)t1
)
709 } else if (otype
!= DHCPV6_OPT_CLIENTID
&&
710 otype
!= DHCPV6_OPT_SERVERID
) {
711 odhcp6c_add_state(STATE_CUSTOM_OPTS
,
712 &odata
[-4], olen
+ 4);
717 have_update
|= odhcp6c_commit_state(STATE_DNS
, dns_len
);
718 have_update
|= odhcp6c_commit_state(STATE_SEARCH
, search_len
);
719 have_update
|= odhcp6c_commit_state(STATE_SNTP_IP
,
721 have_update
|= odhcp6c_commit_state(STATE_SNTP_FQDN
,
723 have_update
|= odhcp6c_commit_state(STATE_SIP_IP
, sip_ip_len
);
724 have_update
|= odhcp6c_commit_state(STATE_SIP_FQDN
, sip_fqdn_len
);
725 size_t new_ia_pd_len
, new_ia_na_len
;
726 odhcp6c_get_state(STATE_IA_PD
, &new_ia_pd_len
);
727 odhcp6c_get_state(STATE_IA_NA
, &new_ia_na_len
);
728 have_update
|= (new_ia_pd_len
!= ia_pd_len
) ||
729 (new_ia_na_len
!= ia_na_len
);
732 // Delete prefixes with 0 valid-time
733 ia_pd
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
734 ia_end
= ia_pd
+ ia_pd_len
;
735 dhcpv6_for_each_option(ia_pd
, ia_end
, otype
, olen
, odata
) {
736 struct dhcpv6_ia_prefix
*p
= (void*)&odata
[-4];
738 ia_end
= ia_pd
+ odhcp6c_remove_state(STATE_IA_PD
,
739 (uint8_t*)p
- ia_pd
, olen
+ 4);
745 // Delete addresses with 0 valid-time
746 ia_na
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
747 ia_end
= ia_na
+ ia_na_len
;
748 dhcpv6_for_each_option(ia_na
, ia_end
, otype
, olen
, odata
) {
749 struct dhcpv6_ia_addr
*p
= (void*)&odata
[-4];
751 ia_end
= ia_na
+ odhcp6c_remove_state(STATE_IA_NA
,
752 (uint8_t*)p
- ia_na
, olen
+ 4);
761 static time_t dhcpv6_parse_ia(void *opt
, void *end
)
763 uint32_t timeout
= UINT32_MAX
; // Minimum timeout
764 uint16_t otype
, olen
, stype
, slen
;
765 uint8_t *odata
, *sdata
;
768 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
769 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
770 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
771 if (olen
+ 4U < sizeof(*prefix
))
774 olen
= sizeof(*prefix
); // Normalize length
775 uint32_t valid
= ntohl(prefix
->valid
);
776 uint32_t pref
= ntohl(prefix
->preferred
);
781 // Search matching IA
782 struct dhcpv6_ia_prefix
*local
= NULL
;
784 uint8_t *pd
= odhcp6c_get_state(STATE_IA_PD
, &pd_len
);
785 dhcpv6_for_each_option(pd
, pd
+ pd_len
,
787 if (!memcmp(sdata
+ 8, odata
+ 8,
788 sizeof(local
->addr
) + 1))
789 local
= (void*)&sdata
[-4];
791 if (local
) { // Already know that IA
792 local
->preferred
= prefix
->preferred
;
793 local
->valid
= prefix
->valid
;
795 odhcp6c_add_state(STATE_IA_PD
, prefix
, olen
);
800 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
801 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
802 if (olen
+ 4U < sizeof(*addr
))
805 olen
= sizeof(*addr
); // Normalize length
806 uint32_t pref
= ntohl(addr
->preferred
);
807 uint32_t valid
= ntohl(addr
->valid
);
812 // Search matching IA
813 struct dhcpv6_ia_addr
*local
= NULL
;
815 uint8_t *na
= odhcp6c_get_state(STATE_IA_NA
, &na_len
);
816 dhcpv6_for_each_option(na
, na
+ na_len
,
818 if (!memcmp(sdata
, odata
, sizeof(local
->addr
)))
819 local
= (void*)&sdata
[-4];
822 if (local
) { // Already know that IA
823 local
->preferred
= addr
->preferred
;
824 local
->valid
= addr
->valid
;
826 odhcp6c_add_state(STATE_IA_NA
, addr
, olen
);
833 if (set_rtnetlink_addr(ifindex
, &addr
->addr
,
834 pref
, valid
) == -EADDRNOTAVAIL
) {
835 dhcpv6_request(DHCPV6_MSG_DECLINE
);