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
,
48 const struct in6_addr
*daddr
);
50 static int dhcpv6_parse_ia(void *opt
, void *end
);
52 static int dhcpv6_calc_refresh_timers(void);
53 static void dhcpv6_handle_status_code(_unused
const enum dhcpv6_msg orig
,
54 const uint16_t code
, const void *status_msg
, const int len
,
56 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
57 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
58 const void *status_msg
, const int len
,
59 bool handled_status_codes
[_DHCPV6_Status_Max
],
62 static reply_handler dhcpv6_handle_reply
;
63 static reply_handler dhcpv6_handle_advert
;
64 static reply_handler dhcpv6_handle_rebind_reply
;
65 static reply_handler dhcpv6_handle_reconfigure
;
66 static int dhcpv6_commit_advert(void);
70 // RFC 3315 - 5.5 Timeout and Delay values
71 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
72 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, 0, "<POLL>",
73 dhcpv6_handle_reconfigure
, NULL
},
74 [DHCPV6_MSG_SOLICIT
] = {true, 1, 3600, 0, "SOLICIT",
75 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
76 [DHCPV6_MSG_REQUEST
] = {true, 1, 30, 10, "REQUEST",
77 dhcpv6_handle_reply
, NULL
},
78 [DHCPV6_MSG_RENEW
] = {false, 10, 600, 0, "RENEW",
79 dhcpv6_handle_reply
, NULL
},
80 [DHCPV6_MSG_REBIND
] = {false, 10, 600, 0, "REBIND",
81 dhcpv6_handle_rebind_reply
, NULL
},
82 [DHCPV6_MSG_RELEASE
] = {false, 1, 0, 5, "RELEASE", NULL
, NULL
},
83 [DHCPV6_MSG_DECLINE
] = {false, 1, 0, 5, "DECLINE", NULL
, NULL
},
84 [DHCPV6_MSG_INFO_REQ
] = {true, 1, 120, 0, "INFOREQ",
85 dhcpv6_handle_reply
, NULL
},
91 static int ifindex
= -1;
92 static int64_t t1
= 0, t2
= 0, t3
= 0;
95 static int request_prefix
= -1;
96 static enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
, pd_mode
= IA_MODE_NONE
;
97 static bool accept_reconfig
= false;
100 static uint8_t reconf_key
[16];
103 int init_dhcpv6(const char *ifname
, int request_pd
, int sol_timeout
)
105 request_prefix
= request_pd
;
106 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
108 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
114 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
115 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
117 ifindex
= ifr
.ifr_ifindex
;
119 // Create client DUID
120 size_t client_id_len
;
121 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
122 if (client_id_len
== 0) {
123 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
124 DHCPV6_DUID_LLADDR
, 0, 1};
126 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
127 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
129 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
130 struct ifreq ifs
[100], *ifp
, *ifend
;
133 ifc
.ifc_len
= sizeof(ifs
);
135 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
136 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
137 // If our interface doesn't have an address...
138 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
139 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
140 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
141 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
142 sizeof(ifr
.ifr_name
));
143 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
145 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
150 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
155 htons(DHCPV6_OPT_SIP_SERVER_D
),
156 htons(DHCPV6_OPT_SIP_SERVER_A
),
157 htons(DHCPV6_OPT_DNS_SERVERS
),
158 htons(DHCPV6_OPT_DNS_DOMAIN
),
159 htons(DHCPV6_OPT_NTP_SERVER
),
160 htons(DHCPV6_OPT_AFTR_NAME
),
161 htons(DHCPV6_OPT_PD_EXCLUDE
),
162 #ifdef EXT_PREFIX_CLASS
163 htons(DHCPV6_OPT_PREFIX_CLASS
),
166 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
169 // Configure IPv6-options
171 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
)) < 0)
173 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
)) < 0)
175 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
)) < 0)
179 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &val
, sizeof(val
)) < 0)
181 if (setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
)) < 0)
184 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
185 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
186 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
196 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
203 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
207 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
214 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
215 sizeof(fqdn
.data
), NULL
, NULL
);
216 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
217 fqdn
.len
= htons(fqdn_len
- 4);
223 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
227 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
230 size_t ia_pd_entries
, ia_pd_len
= 0;
231 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
232 ia_pd_entries
/= sizeof(*e
);
233 struct dhcpv6_ia_hdr hdr_ia_pd
= {
234 htons(DHCPV6_OPT_IA_PD
),
235 htons(sizeof(hdr_ia_pd
) - 4),
240 uint8_t *ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10));
241 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
243 if (e
[i
].priority
> 0)
244 ex_len
= ((e
[i
].priority
- e
[i
].length
- 1) / 8) + 6;
246 struct dhcpv6_ia_prefix p
= {
247 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
248 .len
= htons(sizeof(p
) - 4U + ex_len
),
249 .prefix
= e
[i
].length
,
253 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
254 ia_pd_len
+= sizeof(p
);
257 ia_pd
[ia_pd_len
++] = 0;
258 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
259 ia_pd
[ia_pd_len
++] = 0;
260 ia_pd
[ia_pd_len
++] = ex_len
- 4;
261 ia_pd
[ia_pd_len
++] = e
[i
].priority
;
263 uint32_t excl
= ntohl(e
[i
].router
.s6_addr32
[1]);
264 excl
>>= (64 - e
[i
].priority
);
265 excl
<<= 8 - ((e
[i
].priority
- e
[i
].length
) % 8);
267 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
268 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
269 ia_pd_len
+= ex_len
- 5;
273 struct dhcpv6_ia_prefix pref
= {
274 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
275 .len
= htons(25), .prefix
= request_prefix
277 if (request_prefix
> 0 && ia_pd_len
== 0 && type
== DHCPV6_MSG_SOLICIT
) {
278 ia_pd
= (uint8_t*)&pref
;
279 ia_pd_len
= sizeof(pref
);
281 hdr_ia_pd
.len
= htons(ntohs(hdr_ia_pd
.len
) + ia_pd_len
);
284 size_t ia_na_entries
, ia_na_len
= 0;
286 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
287 ia_na_entries
/= sizeof(*e
);
289 struct dhcpv6_ia_hdr hdr_ia_na
= {
290 htons(DHCPV6_OPT_IA_NA
),
291 htons(sizeof(hdr_ia_na
) - 4),
295 struct dhcpv6_ia_addr pa
[ia_na_entries
];
296 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
297 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
298 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
299 pa
[i
].addr
= e
[i
].target
;
305 ia_na_len
= sizeof(pa
);
306 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
308 // Reconfigure Accept
312 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
314 // Request Information Refresh
315 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
319 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
323 uint16_t elapsed_type
;
324 uint16_t elapsed_len
;
325 uint16_t elapsed_value
;
329 type
, {trid
[0], trid
[1], trid
[2]},
330 htons(DHCPV6_OPT_ELAPSED
), htons(2),
331 htons((ecs
> 0xffff) ? 0xffff : ecs
),
332 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
335 struct iovec iov
[] = {
340 {srv_id
, srv_id_len
},
341 {&reconf_accept
, sizeof(reconf_accept
)},
343 {&hdr_ia_na
, sizeof(hdr_ia_na
)},
345 {&hdr_ia_pd
, sizeof(hdr_ia_pd
)},
349 size_t cnt
= ARRAY_SIZE(iov
);
350 if (type
== DHCPV6_MSG_INFO_REQ
) {
352 iov
[2].iov_len
= sizeof(oro_refresh
);
353 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
354 } else if (!request_prefix
) {
358 // Disable IAs if not used
359 if (type
!= DHCPV6_MSG_SOLICIT
) {
367 if (na_mode
== IA_MODE_NONE
)
370 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
371 0, ALL_DHCPV6_RELAYS
, ifindex
};
372 struct msghdr msg
= {&srv
, sizeof(srv
), iov
, cnt
, NULL
, 0, 0};
374 sendmsg(sock
, &msg
, 0);
378 static int64_t dhcpv6_rand_delay(int64_t time
)
381 odhcp6c_random(&random
, sizeof(random
));
382 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
386 int dhcpv6_request(enum dhcpv6_msg type
)
389 uint64_t timeout
= UINT32_MAX
;
390 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
393 struct timespec ts
= {0, 0};
394 ts
.tv_nsec
= dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY
);
395 nanosleep(&ts
, NULL
);
398 if (type
== DHCPV6_MSG_UNKNOWN
)
400 else if (type
== DHCPV6_MSG_RENEW
)
401 timeout
= (t2
> t1
) ? t2
- t1
: 0;
402 else if (type
== DHCPV6_MSG_REBIND
)
403 timeout
= (t3
> t2
) ? t3
- t2
: 0;
408 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %llus, max rc %d)",
409 retx
->name
, (unsigned long long)timeout
, retx
->max_rc
);
411 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
413 // Generate transaction ID
414 uint8_t trid
[3] = {0, 0, 0};
415 if (type
!= DHCPV6_MSG_UNKNOWN
)
416 odhcp6c_random(trid
, sizeof(trid
));
422 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
424 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
425 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
426 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
428 rto
= (retx
->init_timeo
* 1000 + delay
);
431 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
433 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
434 rto
= retx
->max_timeo
* 1000 +
435 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
437 // Calculate end for this round and elapsed time
438 uint64_t round_end
= round_start
+ rto
;
439 elapsed
= round_start
- start
;
441 // Don't wait too long
442 if (round_end
- start
> timeout
* 1000)
443 round_end
= timeout
* 1000 + start
;
445 // Built and send package
446 if (type
!= DHCPV6_MSG_UNKNOWN
) {
447 if (type
!= DHCPV6_MSG_SOLICIT
)
448 syslog(LOG_NOTICE
, "Send %s message (elapsed %llums, rc %d)",
449 retx
->name
, (unsigned long long)elapsed
, rc
);
450 dhcpv6_send(type
, trid
, elapsed
/ 10);
455 for (; len
< 0 && round_start
< round_end
;
456 round_start
= odhcp6c_get_milli_time()) {
457 uint8_t buf
[1536], cmsg_buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
458 struct iovec iov
= {buf
, sizeof(buf
)};
459 struct msghdr msg
= {NULL
, 0, &iov
, 1,
460 cmsg_buf
, sizeof(cmsg_buf
), 0};
461 struct in6_pktinfo
*pktinfo
= NULL
;
463 // Check for pending signal
464 if (odhcp6c_signal_process())
467 // Set timeout for receiving
468 uint64_t t
= round_end
- round_start
;
469 struct timeval timeout
= {t
/ 1000, (t
% 1000) * 1000};
470 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
471 &timeout
, sizeof(timeout
));
474 len
= recvmsg(sock
, &msg
, 0);
478 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
479 ch
= CMSG_NXTHDR(&msg
, ch
)) {
480 if (ch
->cmsg_level
== SOL_IPV6
&&
481 ch
->cmsg_type
== IPV6_PKTINFO
) {
482 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
487 if (pktinfo
== NULL
) {
492 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
493 type
, &pktinfo
->ipi6_addr
)) {
498 uint8_t *opt
= &buf
[4];
499 uint8_t *opt_end
= opt
+ len
- 4;
501 round_start
= odhcp6c_get_milli_time();
502 elapsed
= round_start
- start
;
503 syslog(LOG_NOTICE
, "Got a valid reply after "
504 "%llums", (unsigned long long)elapsed
);
506 if (retx
->handler_reply
)
507 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
);
509 if (len
> 0 && round_end
- round_start
> 1000)
510 round_end
= 1000 + round_start
;
514 if (retx
->handler_finish
)
515 len
= retx
->handler_finish();
516 } while (len
< 0 && ((elapsed
/ 1000 < timeout
) && (!retx
->max_rc
|| rc
< retx
->max_rc
)));
521 // Message validation checks according to RFC3315 chapter 15
522 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
523 const uint8_t transaction
[3], enum dhcpv6_msg type
,
524 const struct in6_addr
*daddr
)
526 const struct dhcpv6_header
*rep
= buf
;
527 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
528 transaction
, sizeof(rep
->tr_id
)))
529 return false; // Invalid reply
531 if (type
== DHCPV6_MSG_SOLICIT
) {
532 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
533 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
535 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
536 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
538 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
542 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
,
543 rcmsg
= DHCPV6_MSG_UNKNOWN
;
544 uint16_t otype
, olen
;
545 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
546 ia_present
= false, options_valid
= true;
548 size_t client_id_len
, server_id_len
;
549 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
550 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
552 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
553 if (otype
== DHCPV6_OPT_CLIENTID
) {
554 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
555 &odata
[-4], client_id
, client_id_len
);
556 } else if (otype
== DHCPV6_OPT_SERVERID
) {
558 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
559 &odata
[-4], server_id
, server_id_len
);
562 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
563 sizeof(struct dhcpv6_auth_reconfigure
)) {
564 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
565 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
569 uint8_t serverhash
[16], secretbytes
[16], hash
[16];
570 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
571 memset(r
->key
, 0, sizeof(r
->key
));
572 memcpy(secretbytes
, reconf_key
, sizeof(secretbytes
));
574 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
575 secretbytes
[i
] ^= 0x36;
578 md5_append(&md5
, secretbytes
, sizeof(secretbytes
));
579 md5_append(&md5
, buf
, len
);
580 md5_finish(&md5
, hash
);
582 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
583 secretbytes
[i
] ^= 0x36;
584 secretbytes
[i
] ^= 0x5c;
588 md5_append(&md5
, secretbytes
, sizeof(secretbytes
));
589 md5_append(&md5
, hash
, 16);
590 md5_finish(&md5
, hash
);
592 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
593 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
595 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
597 if (olen
< sizeof(struct dhcpv6_ia_hdr
))
598 options_valid
= false;
600 else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
601 (otype
== DHCPV6_OPT_PD_EXCLUDE
)) {
602 // Options are not allowed on global level
603 options_valid
= false;
610 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
613 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
614 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
615 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
616 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
620 return clientid_ok
&& serverid_ok
;
624 int dhcpv6_poll_reconfigure(void)
626 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
628 ret
= dhcpv6_request(ret
);
634 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
, const int rc
,
635 const void *opt
, const void *end
)
637 uint16_t otype
, olen
;
638 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
639 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
640 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
641 odata
[0] == DHCPV6_MSG_RENEW
||
642 odata
[0] == DHCPV6_MSG_INFO_REQ
))
645 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, rc
, NULL
, NULL
);
650 // Collect all advertised servers
651 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
652 const void *opt
, const void *end
)
654 uint16_t olen
, otype
;
655 uint8_t *odata
, pref
= 0;
656 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0}, NULL
, NULL
, 0, 0};
657 bool have_na
= false;
660 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
661 if (orig
== DHCPV6_MSG_SOLICIT
&&
662 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
663 olen
> sizeof(struct dhcpv6_ia_hdr
)) {
664 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
665 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
668 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
669 memcpy(cand
.duid
, odata
, olen
);
670 cand
.duid_len
= olen
;
671 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
672 int error
= ((int)odata
[0] << 8 | (int)odata
[1]);
675 case DHCPV6_NoPrefixAvail
:
676 // Status code on global level
677 if (pd_mode
== IA_MODE_FORCE
)
679 cand
.preference
-= 2000;
682 case DHCPV6_NoAddrsAvail
:
683 // Status code on global level
684 if (na_mode
== IA_MODE_FORCE
)
691 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
692 cand
.preference
>= 0) {
693 cand
.preference
= pref
= odata
[0];
694 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
695 cand
.wants_reconfigure
= true;
696 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
) {
697 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
698 uint8_t *oend
= odata
+ olen
, *d
;
699 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
700 if (otype
== DHCPV6_OPT_IA_PREFIX
&& (olen
+ 4) >=
701 (uint16_t)sizeof(struct dhcpv6_ia_prefix
)) {
702 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
706 } else if (otype
== DHCPV6_OPT_IA_NA
) {
707 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
708 uint8_t *oend
= odata
+ olen
, *d
;
709 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
)
710 if (otype
== DHCPV6_OPT_IA_ADDR
)
715 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
716 (!have_pd
&& pd_mode
== IA_MODE_FORCE
))
719 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
720 cand
.has_noaddravail
= true;
721 cand
.preference
-= 1000;
724 if (pd_mode
!= IA_MODE_NONE
) {
726 cand
.preference
+= 2000 + (128 - have_pd
);
728 cand
.preference
-= 2000;
731 if (cand
.duid_len
> 0) {
732 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
733 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
734 odhcp6c_add_state(STATE_SERVER_CAND
, &cand
, sizeof(cand
));
737 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
741 static int dhcpv6_commit_advert(void)
744 struct dhcpv6_server_cand
*c
= NULL
, *cand
=
745 odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
748 for (size_t i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
749 if (cand
[i
].has_noaddravail
)
750 retry
= true; // We want to try again
752 if (!c
|| c
->preference
< cand
[i
].preference
)
756 if (retry
&& na_mode
== IA_MODE_TRY
) {
757 // We give it a second try without the IA_NA
758 na_mode
= IA_MODE_NONE
;
759 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
763 uint16_t hdr
[2] = {htons(DHCPV6_OPT_SERVERID
),
765 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
766 odhcp6c_add_state(STATE_SERVER_ID
, c
->duid
, c
->duid_len
);
767 accept_reconfig
= c
->wants_reconfigure
;
769 odhcp6c_add_state(STATE_IA_NA
, c
->ia_na
, c
->ia_na_len
);
771 odhcp6c_add_state(STATE_IA_PD
, c
->ia_pd
, c
->ia_pd_len
);
774 for (size_t i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
778 odhcp6c_clear_state(STATE_SERVER_CAND
);
782 else if ((request_prefix
&& c
->ia_pd_len
) || (na_mode
!= IA_MODE_NONE
&& c
->ia_na_len
))
783 return DHCPV6_STATEFUL
;
785 return DHCPV6_STATELESS
;
789 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
790 const void *opt
, const void *end
)
792 dhcpv6_handle_advert(orig
, rc
, opt
, end
);
793 if (dhcpv6_commit_advert() < 0)
796 return dhcpv6_handle_reply(orig
, rc
, opt
, end
);
800 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
801 const void *opt
, const void *end
)
804 uint16_t otype
, olen
;
805 uint32_t refresh
= UINT32_MAX
;
807 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
811 if (orig
== DHCPV6_MSG_UNKNOWN
) {
812 static time_t last_update
= 0;
813 time_t now
= odhcp6c_get_milli_time() / 1000;
815 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
832 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
833 // Delete NA and PD we have in the state from the Advert
834 odhcp6c_clear_state(STATE_IA_NA
);
835 odhcp6c_clear_state(STATE_IA_PD
);
839 odhcp6c_clear_state(STATE_DNS
);
840 odhcp6c_clear_state(STATE_SEARCH
);
841 odhcp6c_clear_state(STATE_SNTP_IP
);
842 odhcp6c_clear_state(STATE_SNTP_FQDN
);
843 odhcp6c_clear_state(STATE_SIP_IP
);
844 odhcp6c_clear_state(STATE_SIP_FQDN
);
845 odhcp6c_clear_state(STATE_AFTR_NAME
);
848 // Parse and find all matching IAs
849 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
850 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
851 && olen
> sizeof(struct dhcpv6_ia_hdr
)) {
852 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
855 if (ia_hdr
->iaid
!= 1)
858 uint16_t code
= DHCPV6_Success
;
859 uint16_t stype
, slen
;
861 // Get and handle status code
862 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
863 stype
, slen
, sdata
) {
864 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
865 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
866 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
868 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
870 if (code
== DHCPV6_Success
)
873 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
874 code
, mdata
, mlen
, handled_status_codes
, &ret
);
883 if (code
!= DHCPV6_Success
)
886 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
887 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
888 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
889 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
890 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
892 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
894 else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
896 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
897 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
898 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
899 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
900 uint16_t stype
, slen
;
902 // Test status and bail if error
903 dhcpv6_for_each_option(odata
, odata
+ olen
,
904 stype
, slen
, sdata
) {
905 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
906 stype
== NTP_SRV_ADDR
))
907 odhcp6c_add_state(STATE_SNTP_IP
,
909 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
910 odhcp6c_add_state(STATE_SNTP_FQDN
,
913 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
915 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
916 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
917 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
918 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
919 refresh
= ntohl(*((uint32_t*)odata
));
920 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
921 sizeof(struct dhcpv6_auth_reconfigure
)) {
922 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
923 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
925 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
926 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
928 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
930 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
931 } else if (otype
!= DHCPV6_OPT_CLIENTID
&&
932 otype
!= DHCPV6_OPT_SERVERID
) {
933 odhcp6c_add_state(STATE_CUSTOM_OPTS
,
934 &odata
[-4], olen
+ 4);
938 if (orig
!= DHCPV6_MSG_INFO_REQ
) {
939 // Update refresh timers if no fatal status code was received
940 if ((ret
> 0) && dhcpv6_calc_refresh_timers()) {
942 case DHCPV6_MSG_RENEW
:
943 // Send further renews if T1 is not set
947 case DHCPV6_MSG_REBIND
:
948 // Send further rebinds if T1 and T2 is not set
965 static int dhcpv6_parse_ia(void *opt
, void *end
)
967 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
970 uint16_t otype
, olen
;
973 t1
= ntohl(ia_hdr
->t1
);
974 t2
= ntohl(ia_hdr
->t2
);
980 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
981 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0,
982 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0};
984 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
985 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
986 if (olen
+ 4U < sizeof(*prefix
))
989 entry
.valid
= ntohl(prefix
->valid
);
990 entry
.preferred
= ntohl(prefix
->preferred
);
992 if (entry
.preferred
> entry
.valid
)
995 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
996 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
997 if (entry
.t1
> entry
.t2
)
1000 entry
.length
= prefix
->prefix
;
1001 entry
.target
= prefix
->addr
;
1002 uint16_t stype
, slen
;
1005 #ifdef EXT_PREFIX_CLASS
1006 // Find prefix class, if any
1007 dhcpv6_for_each_option(&prefix
[1], odata
+ olen
,
1009 if (stype
== DHCPV6_OPT_PREFIX_CLASS
&& slen
== 2)
1010 entry
.class = sdata
[0] << 8 | sdata
[1];
1015 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1016 odata
+ olen
, stype
, slen
, sdata
) {
1017 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1020 uint8_t elen
= sdata
[0];
1024 if (elen
<= 32 || elen
<= entry
.length
) {
1030 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1031 if (slen
<= bytes
) {
1036 uint32_t exclude
= 0;
1038 exclude
= exclude
<< 8 | sdata
[bytes
];
1041 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1042 exclude
<<= 64 - elen
;
1044 // Abusing router & priority fields for exclusion
1045 entry
.router
= entry
.target
;
1046 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1047 entry
.priority
= elen
;
1051 odhcp6c_update_entry(STATE_IA_PD
, &entry
);
1056 memset(&entry
.router
, 0, sizeof(entry
.router
));
1057 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1058 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1059 if (olen
+ 4U < sizeof(*addr
))
1062 entry
.preferred
= ntohl(addr
->preferred
);
1063 entry
.valid
= ntohl(addr
->valid
);
1065 if (entry
.preferred
> entry
.valid
)
1068 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1069 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1070 if (entry
.t1
> entry
.t2
)
1071 entry
.t1
= entry
.t2
;
1074 entry
.target
= addr
->addr
;
1076 #ifdef EXT_PREFIX_CLASS
1077 uint16_t stype
, slen
;
1079 // Find prefix class, if any
1080 dhcpv6_for_each_option(&addr
[1], odata
+ olen
,
1082 if (stype
== DHCPV6_OPT_PREFIX_CLASS
&& slen
== 2)
1083 entry
.class = sdata
[0] << 8 | sdata
[1];
1086 odhcp6c_update_entry(STATE_IA_NA
, &entry
);
1094 static int dhcpv6_calc_refresh_timers(void)
1096 struct odhcp6c_entry
*e
;
1097 size_t ia_na_entries
, ia_pd_entries
, i
;
1098 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1100 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1101 ia_na_entries
/= sizeof(*e
);
1102 for (i
= 0; i
< ia_na_entries
; i
++) {
1109 if (e
[i
].valid
> l_t3
)
1113 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1114 ia_pd_entries
/= sizeof(*e
);
1115 for (i
= 0; i
< ia_pd_entries
; i
++) {
1122 if (e
[i
].valid
> l_t3
)
1126 if (ia_pd_entries
|| ia_na_entries
) {
1132 return (int)(ia_pd_entries
+ ia_na_entries
);
1136 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1137 const void *status_msg
, const int len
)
1139 uint8_t buf
[len
+ 3];
1141 memset(buf
, 0, sizeof(buf
));
1144 memcpy(&buf
[1], status_msg
, len
);
1148 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1153 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1154 const uint16_t code
, const void *status_msg
, const int len
,
1157 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1160 case DHCPV6_UnspecFail
:
1165 case DHCPV6_UseMulticast
:
1166 // TODO handle multicast status code
1169 case DHCPV6_NoAddrsAvail
:
1170 case DHCPV6_NoPrefixAvail
:
1171 if (orig
== DHCPV6_MSG_REQUEST
)
1172 *ret
= 0; // Failure
1181 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1182 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1183 const void *status_msg
, const int len
,
1184 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1186 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1187 "IA_NA" : "IA_PD", status_msg
, len
);
1190 case DHCPV6_NoBinding
:
1192 case DHCPV6_MSG_RENEW
:
1193 case DHCPV6_MSG_REBIND
:
1194 if ((*ret
> 0) && !handled_status_codes
[code
])
1195 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1203 case DHCPV6_NoAddrsAvail
:
1204 case DHCPV6_NoPrefixAvail
:
1206 case DHCPV6_MSG_REQUEST
:
1215 case DHCPV6_NotOnLink
:
1216 // TODO handle not onlink in case of confirm