2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
32 #include <net/ethernet.h>
38 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
39 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
40 #define DHCPV6_CLIENT_PORT 546
41 #define DHCPV6_SERVER_PORT 547
42 #define DHCPV6_DUID_LLADDR 3
43 #define DHCPV6_REQ_DELAY 1
46 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
47 const uint8_t transaction
[3], enum dhcpv6_msg type
);
49 static uint32_t dhcpv6_parse_ia(void *opt
, void *end
);
51 static reply_handler dhcpv6_handle_reply
;
52 static reply_handler dhcpv6_handle_advert
;
53 static reply_handler dhcpv6_handle_rebind_reply
;
54 static reply_handler dhcpv6_handle_reconfigure
;
55 static int dhcpv6_commit_advert(void);
59 // RFC 3315 - 5.5 Timeout and Delay values
60 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
61 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, "<POLL>",
62 dhcpv6_handle_reconfigure
, NULL
},
63 [DHCPV6_MSG_SOLICIT
] = {true, 1, 3600, "SOLICIT",
64 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
65 [DHCPV6_MSG_REQUEST
] = {true, 30, 10, "REQUEST",
66 dhcpv6_handle_reply
, NULL
},
67 [DHCPV6_MSG_RENEW
] = {false, 10, 600, "RENEW",
68 dhcpv6_handle_reply
, NULL
},
69 [DHCPV6_MSG_REBIND
] = {false, 10, 600, "REBIND",
70 dhcpv6_handle_rebind_reply
, NULL
},
71 [DHCPV6_MSG_RELEASE
] = {false, 1, 600, "RELEASE", NULL
, NULL
},
72 [DHCPV6_MSG_DECLINE
] = {false, 1, 3, "DECLINE", NULL
, NULL
},
73 [DHCPV6_MSG_INFO_REQ
] = {true, 1, 120, "INFOREQ",
74 dhcpv6_handle_reply
, NULL
},
80 static int ifindex
= -1;
81 static int64_t t1
= 0, t2
= 0, t3
= 0;
84 static int request_prefix
= -1;
85 static enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
;
86 static bool accept_reconfig
= false;
89 static uint8_t reconf_key
[16];
93 int init_dhcpv6(const char *ifname
, int request_pd
)
95 request_prefix
= request_pd
;
97 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
101 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
102 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
))
104 ifindex
= ifr
.ifr_ifindex
;
106 // Create client DUID
107 size_t client_id_len
;
108 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
109 if (client_id_len
== 0) {
110 ioctl(sock
, SIOCGIFHWADDR
, &ifr
);
111 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
112 DHCPV6_DUID_LLADDR
, 0, 1};
113 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
115 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
116 struct ifreq ifs
[100], *ifp
, *ifend
;
119 ifc
.ifc_len
= sizeof(ifs
);
121 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
122 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
123 // If our interface doesn't have an address...
124 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
125 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
126 !memcmp(&duid
[8], zero
, 6); ifp
++) {
127 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
128 sizeof(ifr
.ifr_name
));
129 ioctl(sock
, SIOCGIFHWADDR
, &ifr
);
130 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
135 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
139 uint16_t oro
[] = {htons(DHCPV6_OPT_DNS_SERVERS
),
140 htons(DHCPV6_OPT_DNS_DOMAIN
),
141 htons(DHCPV6_OPT_NTP_SERVER
),
142 htons(DHCPV6_OPT_SIP_SERVER_A
),
143 htons(DHCPV6_OPT_SIP_SERVER_D
),
144 htons(DHCPV6_OPT_PD_EXCLUDE
)};
145 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
148 // Configure IPv6-options
150 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
151 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
152 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
154 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
155 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
156 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)))
163 void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode
)
169 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
173 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
180 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
181 sizeof(fqdn
.data
), NULL
, NULL
);
182 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
183 fqdn
.len
= htons(fqdn_len
- 4);
189 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
193 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
196 size_t ia_pd_entries
, ia_pd_len
= 0;
197 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
198 ia_pd_entries
/= sizeof(*e
);
199 struct dhcpv6_ia_hdr hdr_ia_pd
= {
200 htons(DHCPV6_OPT_IA_PD
),
201 htons(sizeof(hdr_ia_pd
) - 4),
206 uint8_t *ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10));
207 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
209 if (e
[i
].priority
> 0)
210 ex_len
= ((e
[i
].priority
- e
[i
].length
- 1) / 8) + 6;
212 struct dhcpv6_ia_prefix p
= {
213 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
214 .len
= htons(sizeof(p
) - 4U + ex_len
),
215 .prefix
= e
[i
].length
,
219 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
220 ia_pd_len
+= sizeof(p
);
223 ia_pd
[ia_pd_len
++] = 0;
224 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
225 ia_pd
[ia_pd_len
++] = 0;
226 ia_pd
[ia_pd_len
++] = ex_len
- 4;
227 ia_pd
[ia_pd_len
++] = e
[i
].priority
;
229 uint32_t excl
= ntohl(e
[i
].router
.s6_addr32
[1]);
230 excl
>>= (64 - e
[i
].priority
);
231 excl
<<= 8 - ((e
[i
].priority
- e
[i
].length
) % 8);
233 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
234 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
235 ia_pd_len
+= ex_len
- 5;
239 struct dhcpv6_ia_prefix pref
= {
240 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
241 .len
= htons(25), .prefix
= request_prefix
243 if (request_prefix
> 0 && ia_pd_len
== 0 &&
244 (type
== DHCPV6_MSG_SOLICIT
||
245 type
== DHCPV6_MSG_REQUEST
)) {
246 ia_pd
= (uint8_t*)&pref
;
247 ia_pd_len
= sizeof(pref
);
249 hdr_ia_pd
.len
= htons(ntohs(hdr_ia_pd
.len
) + ia_pd_len
);
252 size_t ia_na_entries
, ia_na_len
= 0;
254 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
255 ia_na_entries
/= sizeof(*e
);
257 struct dhcpv6_ia_hdr hdr_ia_na
= {
258 htons(DHCPV6_OPT_IA_NA
),
259 htons(sizeof(hdr_ia_na
) - 4),
263 struct dhcpv6_ia_addr pa
[ia_na_entries
];
264 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
265 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
266 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
267 pa
[i
].addr
= e
[i
].target
;
273 ia_na_len
= sizeof(pa
);
274 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
276 // Reconfigure Accept
280 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
282 // Request Information Refresh
283 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
287 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
291 uint16_t elapsed_type
;
292 uint16_t elapsed_len
;
293 uint16_t elapsed_value
;
297 type
, {trid
[0], trid
[1], trid
[2]},
298 htons(DHCPV6_OPT_ELAPSED
), htons(2),
299 htons((ecs
> 0xffff) ? 0xffff : ecs
),
300 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
303 struct iovec iov
[] = {
308 {srv_id
, srv_id_len
},
311 {&hdr_ia_na
, sizeof(hdr_ia_na
)},
313 {&hdr_ia_pd
, sizeof(hdr_ia_pd
)},
317 size_t cnt
= ARRAY_SIZE(iov
);
318 if (type
== DHCPV6_MSG_INFO_REQ
) {
320 iov
[2].iov_len
= sizeof(oro_refresh
);
321 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
322 } else if (!request_prefix
) {
326 // Disable IAs if not used
327 if (type
== DHCPV6_MSG_SOLICIT
) {
328 iov
[5].iov_len
= sizeof(reconf_accept
);
329 } else if (type
!= DHCPV6_MSG_REQUEST
) {
336 if (na_mode
== IA_MODE_NONE
)
339 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
340 0, ALL_DHCPV6_RELAYS
, ifindex
};
341 struct msghdr msg
= {&srv
, sizeof(srv
), iov
, cnt
, NULL
, 0, 0};
343 sendmsg(sock
, &msg
, 0);
347 static int64_t dhcpv6_rand_delay(int64_t time
)
350 odhcp6c_random(&random
, sizeof(random
));
351 return (time
* (random
% 1000)) / 10000;
355 int dhcpv6_request(enum dhcpv6_msg type
)
358 uint32_t timeout
= UINT32_MAX
;
359 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
362 struct timespec ts
= {0, 0};
363 ts
.tv_nsec
= dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY
);
364 nanosleep(&ts
, NULL
);
367 if (type
== DHCPV6_MSG_RELEASE
|| type
== DHCPV6_MSG_DECLINE
)
369 else if (type
== DHCPV6_MSG_UNKNOWN
)
371 else if (type
== DHCPV6_MSG_RENEW
)
373 else if (type
== DHCPV6_MSG_REBIND
)
379 syslog(LOG_NOTICE
, "Sending %s (timeout %us)", retx
->name
, timeout
);
381 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
383 // Generate transaction ID
384 uint8_t trid
[3] = {0, 0, 0};
385 if (type
!= DHCPV6_MSG_UNKNOWN
)
386 odhcp6c_random(trid
, sizeof(trid
));
391 rto
= (rto
== 0) ? (retx
->init_timeo
* 1000 +
392 dhcpv6_rand_delay(retx
->init_timeo
* 1000)) :
393 (2 * rto
+ dhcpv6_rand_delay(rto
));
395 if (rto
>= retx
->max_timeo
* 1000)
396 rto
= retx
->max_timeo
* 1000 +
397 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
399 // Calculate end for this round and elapsed time
400 uint64_t round_end
= round_start
+ rto
;
401 elapsed
= round_start
- start
;
403 // Don't wait too long
404 if (round_end
- start
> timeout
* 1000)
405 round_end
= timeout
* 1000 + start
;
407 // Built and send package
408 if (type
!= DHCPV6_MSG_UNKNOWN
)
409 dhcpv6_send(type
, trid
, elapsed
/ 10);
412 for (; len
< 0 && round_start
< round_end
;
413 round_start
= odhcp6c_get_milli_time()) {
414 // Check for pending signal
415 if (odhcp6c_signal_process())
418 // Set timeout for receiving
419 uint64_t t
= round_end
- round_start
;
420 struct timeval timeout
= {t
/ 1000, (t
% 1000) * 1000};
421 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
422 &timeout
, sizeof(timeout
));
425 len
= recv(sock
, buf
, sizeof(buf
), 0);
427 if (!dhcpv6_response_is_valid(buf
, len
, trid
, type
))
431 uint8_t *opt
= &buf
[4];
432 uint8_t *opt_end
= opt
+ len
- 4;
434 round_start
= odhcp6c_get_milli_time();
435 elapsed
= round_start
- start
;
436 syslog(LOG_NOTICE
, "Got a valid reply after "
437 "%ums", (unsigned)elapsed
);
439 if (retx
->handler_reply
)
440 len
= retx
->handler_reply(
443 if (round_end
- round_start
> 1000)
444 round_end
= 1000 + round_start
;
449 if (retx
->handler_finish
)
450 len
= retx
->handler_finish();
451 } while (len
< 0 && elapsed
/ 1000 < timeout
);
457 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
458 const uint8_t transaction
[3], enum dhcpv6_msg type
)
460 const struct dhcpv6_header
*rep
= buf
;
461 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
462 transaction
, sizeof(rep
->tr_id
)))
463 return false; // Invalid reply
465 if (type
== DHCPV6_MSG_SOLICIT
) {
466 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
467 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
469 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
470 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
472 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
476 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
;
477 uint16_t otype
, olen
;
478 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false;
480 size_t client_id_len
, server_id_len
;
481 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
482 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
484 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
485 if (otype
== DHCPV6_OPT_CLIENTID
) {
486 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
487 &odata
[-4], client_id
, client_id_len
);
488 } else if (otype
== DHCPV6_OPT_SERVERID
) {
489 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
490 &odata
[-4], server_id
, server_id_len
);
491 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
492 sizeof(struct dhcpv6_auth_reconfigure
)) {
493 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
494 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
498 uint8_t serverhash
[16], secretbytes
[16], hash
[16];
499 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
500 memset(r
->key
, 0, sizeof(r
->key
));
501 memcpy(secretbytes
, reconf_key
, sizeof(secretbytes
));
503 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
504 secretbytes
[i
] ^= 0x36;
507 md5_append(&md5
, secretbytes
, sizeof(secretbytes
));
508 md5_append(&md5
, buf
, len
);
509 md5_finish(&md5
, hash
);
511 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
512 secretbytes
[i
] ^= 0x36;
513 secretbytes
[i
] ^= 0x5c;
517 md5_append(&md5
, secretbytes
, sizeof(secretbytes
));
518 md5_append(&md5
, hash
, 16);
519 md5_finish(&md5
, hash
);
521 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
525 if (rep
->msg_type
== DHCPV6_MSG_RECONF
&& !rcauth_ok
)
528 return clientid_ok
&& (serverid_ok
|| server_id_len
== 0);
532 int dhcpv6_poll_reconfigure(void)
534 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
536 ret
= dhcpv6_request(ret
);
542 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
,
543 const void *opt
, const void *end
)
545 // TODO: should verify the reconfigure message
546 uint16_t otype
, olen
;
547 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
548 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
549 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
550 odata
[0] == DHCPV6_MSG_RENEW
||
551 odata
[0] == DHCPV6_MSG_INFO_REQ
))
554 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, NULL
, NULL
);
559 // Collect all advertised servers
560 static int dhcpv6_handle_advert(_unused
enum dhcpv6_msg orig
,
561 const void *opt
, const void *end
)
563 uint16_t olen
, otype
;
565 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0}};
567 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
568 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
569 memcpy(cand
.duid
, odata
, olen
);
570 cand
.duid_len
= olen
;
571 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2 && !odata
[0]
572 && odata
[1] == DHCPV6_NoAddrsAvail
) {
573 if (na_mode
== IA_MODE_FORCE
) {
576 cand
.has_noaddravail
= true;
577 cand
.preference
-= 1000;
579 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2 && !odata
[0]
580 && odata
[1] == DHCPV6_NoPrefixAvail
) {
581 cand
.preference
-= 2000;
582 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
583 cand
.preference
>= 0) {
584 cand
.preference
= odata
[0];
585 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
586 cand
.wants_reconfigure
= true;
587 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
) {
588 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
589 uint8_t *oend
= odata
+ olen
, *d
;
590 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
591 if (otype
== DHCPV6_OPT_IA_PREFIX
)
592 cand
.preference
+= 2000;
593 else if (otype
== DHCPV6_OPT_STATUS
&&
594 olen
>= 2 && d
[0] == 0 &&
595 d
[1] == DHCPV6_NoPrefixAvail
)
596 cand
.preference
-= 2000;
601 if (cand
.duid_len
> 0)
602 odhcp6c_add_state(STATE_SERVER_CAND
, &cand
, sizeof(cand
));
608 static int dhcpv6_commit_advert(void)
611 struct dhcpv6_server_cand
*c
= NULL
, *cand
=
612 odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
615 for (size_t i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
616 if (cand
[i
].has_noaddravail
)
617 retry
= true; // We want to try again
619 if (!c
|| c
->preference
< cand
[i
].preference
)
623 if (retry
&& na_mode
== IA_MODE_TRY
) {
624 // We give it a second try without the IA_NA
625 na_mode
= IA_MODE_NONE
;
626 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
630 uint16_t hdr
[2] = {htons(DHCPV6_OPT_SERVERID
),
632 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
633 odhcp6c_add_state(STATE_SERVER_ID
, c
->duid
, c
->duid_len
);
634 accept_reconfig
= c
->wants_reconfigure
;
637 odhcp6c_clear_state(STATE_SERVER_CAND
);
641 else if (request_prefix
|| na_mode
!= IA_MODE_NONE
)
642 return DHCPV6_STATEFUL
;
644 return DHCPV6_STATELESS
;
648 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
,
649 const void *opt
, const void *end
)
651 dhcpv6_handle_advert(orig
, opt
, end
);
652 if (dhcpv6_commit_advert() < 0) {
653 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, NULL
, NULL
);
657 return dhcpv6_handle_reply(orig
, opt
, end
);
661 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
,
662 const void *opt
, const void *end
)
665 uint16_t otype
, olen
;
667 static time_t last_update
= 0;
668 time_t now
= odhcp6c_get_milli_time() / 1000;
670 uint32_t elapsed
= now
- last_update
;
673 if (orig
== DHCPV6_MSG_UNKNOWN
) {
687 t1
= t2
= t3
= UINT32_MAX
;
691 odhcp6c_clear_state(STATE_DNS
);
692 odhcp6c_clear_state(STATE_SEARCH
);
693 odhcp6c_clear_state(STATE_SNTP_IP
);
694 odhcp6c_clear_state(STATE_SNTP_FQDN
);
695 odhcp6c_clear_state(STATE_SIP_IP
);
696 odhcp6c_clear_state(STATE_SIP_FQDN
);
699 // Parse and find all matching IAs
700 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
701 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
702 && olen
> sizeof(struct dhcpv6_ia_hdr
)) {
703 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
704 uint32_t l_t1
= ntohl(ia_hdr
->t1
);
705 uint32_t l_t2
= ntohl(ia_hdr
->t2
);
707 // Test ID and T1-T2 validity
708 if (ia_hdr
->iaid
!= 1 || l_t2
< l_t1
)
712 uint16_t stype
, slen
;
714 // Test status and bail if error
715 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
717 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2 &&
718 (sdata
[0] || sdata
[1]))
725 if (l_t1
> 0 && t1
> l_t1
)
728 if (l_t2
> 0 && t2
> l_t2
)
731 uint32_t n
= dhcpv6_parse_ia(&ia_hdr
[1], odata
+ olen
);
748 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
750 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
751 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
752 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
753 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
754 uint16_t stype
, slen
;
756 // Test status and bail if error
757 dhcpv6_for_each_option(odata
, odata
+ olen
,
758 stype
, slen
, sdata
) {
759 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
760 stype
== NTP_SRV_ADDR
))
761 odhcp6c_add_state(STATE_SNTP_IP
,
763 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
764 odhcp6c_add_state(STATE_SNTP_FQDN
,
767 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
769 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
770 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
771 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
772 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
773 uint32_t refresh
= ntohl(*((uint32_t*)odata
));
774 if (refresh
< (uint32_t)t1
)
776 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
777 sizeof(struct dhcpv6_auth_reconfigure
)) {
778 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
779 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
781 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
782 } else if (otype
!= DHCPV6_OPT_CLIENTID
&&
783 otype
!= DHCPV6_OPT_SERVERID
) {
784 odhcp6c_add_state(STATE_CUSTOM_OPTS
,
785 &odata
[-4], olen
+ 4);
793 static uint32_t dhcpv6_parse_ia(void *opt
, void *end
)
795 uint32_t timeout
= UINT32_MAX
; // Minimum timeout
796 uint16_t otype
, olen
;
799 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
,
800 0, 0, IN6ADDR_ANY_INIT
, 0, 0};
803 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
804 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
805 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
806 if (olen
+ 4U < sizeof(*prefix
))
809 entry
.valid
= ntohl(prefix
->valid
);
810 entry
.preferred
= ntohl(prefix
->preferred
);
812 if (entry
.preferred
> entry
.valid
)
815 entry
.length
= prefix
->prefix
;
816 entry
.target
= prefix
->addr
;
820 uint16_t stype
, slen
;
822 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
823 odata
+ olen
, stype
, slen
, sdata
) {
824 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
827 uint8_t elen
= sdata
[0];
831 if (elen
<= 32 || elen
<= entry
.length
) {
837 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
843 uint32_t exclude
= 0;
845 exclude
= exclude
<< 8 | sdata
[bytes
];
848 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
849 exclude
<<= 64 - elen
;
851 // Abusing router & priority fields for exclusion
852 entry
.router
= entry
.target
;
853 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
854 entry
.priority
= elen
;
858 odhcp6c_update_entry(STATE_IA_PD
, &entry
);
861 memset(&entry
.router
, 0, sizeof(entry
.router
));
862 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
863 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
864 if (olen
+ 4U < sizeof(*addr
))
867 entry
.preferred
= ntohl(addr
->preferred
);
868 entry
.valid
= ntohl(addr
->valid
);
870 if (entry
.preferred
> entry
.valid
)
874 entry
.target
= addr
->addr
;
876 odhcp6c_update_entry(STATE_IA_NA
, &entry
);
879 if (entry
.valid
> 0 && timeout
> entry
.valid
)
880 timeout
= entry
.valid
;