2 * Copyright (C) 2012-2014 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
45 #define DHCPV6_SOL_MAX_RT_MIN 60
46 #define DHCPV6_SOL_MAX_RT_MAX 86400
47 #define DHCPV6_INF_MAX_RT_MIN 60
48 #define DHCPV6_INF_MAX_RT_MAX 86400
50 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
51 const uint8_t transaction
[3], enum dhcpv6_msg type
,
52 const struct in6_addr
*daddr
);
54 static int dhcpv6_parse_ia(void *opt
, void *end
);
56 static int dhcpv6_calc_refresh_timers(void);
57 static void dhcpv6_handle_status_code(_unused
const enum dhcpv6_msg orig
,
58 const uint16_t code
, const void *status_msg
, const int len
,
60 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
61 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
62 const void *status_msg
, const int len
,
63 bool handled_status_codes
[_DHCPV6_Status_Max
],
65 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
);
66 static void dhcpv6_clear_all_server_cand(void);
68 static reply_handler dhcpv6_handle_reply
;
69 static reply_handler dhcpv6_handle_advert
;
70 static reply_handler dhcpv6_handle_rebind_reply
;
71 static reply_handler dhcpv6_handle_reconfigure
;
72 static int dhcpv6_commit_advert(void);
76 // RFC 3315 - 5.5 Timeout and Delay values
77 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
78 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, 0, "<POLL>",
79 dhcpv6_handle_reconfigure
, NULL
},
80 [DHCPV6_MSG_SOLICIT
] = {true, 1, DHCPV6_SOL_MAX_RT
, 0, "SOLICIT",
81 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
82 [DHCPV6_MSG_REQUEST
] = {true, 1, DHCPV6_REQ_MAX_RT
, 10, "REQUEST",
83 dhcpv6_handle_reply
, NULL
},
84 [DHCPV6_MSG_RENEW
] = {false, 10, DHCPV6_REN_MAX_RT
, 0, "RENEW",
85 dhcpv6_handle_reply
, NULL
},
86 [DHCPV6_MSG_REBIND
] = {false, 10, DHCPV6_REB_MAX_RT
, 0, "REBIND",
87 dhcpv6_handle_rebind_reply
, NULL
},
88 [DHCPV6_MSG_RELEASE
] = {false, 1, 0, 5, "RELEASE", NULL
, NULL
},
89 [DHCPV6_MSG_DECLINE
] = {false, 1, 0, 5, "DECLINE", NULL
, NULL
},
90 [DHCPV6_MSG_INFO_REQ
] = {true, 1, DHCPV6_INF_MAX_RT
, 0, "INFOREQ",
91 dhcpv6_handle_reply
, NULL
},
97 static int ifindex
= -1;
98 static int64_t t1
= 0, t2
= 0, t3
= 0;
101 static int request_prefix
= -1;
102 static enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
, pd_mode
= IA_MODE_NONE
;
103 static bool accept_reconfig
= false;
106 static uint8_t reconf_key
[16];
109 static unsigned int client_options
= 0;
112 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
114 client_options
= options
;
115 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
117 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
123 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
124 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
126 ifindex
= ifr
.ifr_ifindex
;
128 // Create client DUID
129 size_t client_id_len
;
130 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
131 if (client_id_len
== 0) {
132 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
133 DHCPV6_DUID_LLADDR
, 0, 1};
135 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
136 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
138 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
139 struct ifreq ifs
[100], *ifp
, *ifend
;
142 ifc
.ifc_len
= sizeof(ifs
);
144 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
145 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
146 // If our interface doesn't have an address...
147 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
148 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
149 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
150 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
151 sizeof(ifr
.ifr_name
));
152 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
155 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
160 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
164 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
166 htons(DHCPV6_OPT_SIP_SERVER_D
),
167 htons(DHCPV6_OPT_SIP_SERVER_A
),
168 htons(DHCPV6_OPT_DNS_SERVERS
),
169 htons(DHCPV6_OPT_DNS_DOMAIN
),
170 htons(DHCPV6_OPT_SNTP_SERVERS
),
171 htons(DHCPV6_OPT_NTP_SERVER
),
172 htons(DHCPV6_OPT_AFTR_NAME
),
173 htons(DHCPV6_OPT_PD_EXCLUDE
),
174 htons(DHCPV6_OPT_SOL_MAX_RT
),
175 htons(DHCPV6_OPT_INF_MAX_RT
),
176 #ifdef EXT_PREFIX_CLASS
177 htons(DHCPV6_OPT_PREFIX_CLASS
),
180 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
183 // Configure IPv6-options
185 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
186 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
187 setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
));
189 setsockopt(sock
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &val
, sizeof(val
));
190 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
192 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
193 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
194 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
201 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
207 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
211 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
218 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
219 sizeof(fqdn
.data
), NULL
, NULL
);
220 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
221 fqdn
.len
= htons(fqdn_len
- 4);
227 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
231 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
234 size_t ia_pd_entries
, ia_pd_len
= 0;
237 if (type
== DHCPV6_MSG_SOLICIT
) {
238 odhcp6c_clear_state(STATE_IA_PD
);
240 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
241 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
243 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
245 for (size_t i
= 0; i
< n_prefixes
; i
++) {
246 struct dhcpv6_ia_hdr hdr_ia_pd
= {
247 htons(DHCPV6_OPT_IA_PD
),
248 htons(sizeof(hdr_ia_pd
) - 4 + sizeof(struct dhcpv6_ia_prefix
)),
249 request_prefixes
[i
].iaid
, 0, 0
251 struct dhcpv6_ia_prefix pref
= {
252 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
253 .len
= htons(25), .prefix
= request_prefixes
[i
].length
255 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
256 ia_pd_len
+= sizeof(hdr_ia_pd
);
257 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
258 ia_pd_len
+= sizeof(pref
);
261 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
262 ia_pd_entries
/= sizeof(*e
);
264 // we're too lazy to count our distinct IAIDs,
265 // so just allocate maximally needed space
266 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
267 sizeof(struct dhcpv6_ia_hdr
)));
269 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
270 uint32_t iaid
= e
[i
].iaid
;
272 // check if this is an unprocessed IAID and skip if not.
274 for (int j
= i
-1; j
>= 0; j
--) {
275 if (e
[j
].iaid
== iaid
) {
285 struct dhcpv6_ia_hdr hdr_ia_pd
= {
286 htons(DHCPV6_OPT_IA_PD
),
287 htons(sizeof(hdr_ia_pd
) - 4),
291 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
292 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
293 ia_pd_len
+= sizeof(hdr_ia_pd
);
295 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
296 if (e
[j
].iaid
!= iaid
)
300 if (e
[j
].priority
> 0)
301 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
303 struct dhcpv6_ia_prefix p
= {
304 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
305 .len
= htons(sizeof(p
) - 4U + ex_len
),
306 .prefix
= e
[j
].length
,
310 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
311 ia_pd_len
+= sizeof(p
);
314 ia_pd
[ia_pd_len
++] = 0;
315 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
316 ia_pd
[ia_pd_len
++] = 0;
317 ia_pd
[ia_pd_len
++] = ex_len
- 4;
318 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
320 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
321 excl
>>= (64 - e
[j
].priority
);
322 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
324 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
325 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
326 ia_pd_len
+= ex_len
- 5;
329 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
334 if (ia_pd_entries
> 0)
338 size_t ia_na_entries
, ia_na_len
= 0;
340 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
341 ia_na_entries
/= sizeof(*e
);
343 struct dhcpv6_ia_hdr hdr_ia_na
= {
344 htons(DHCPV6_OPT_IA_NA
),
345 htons(sizeof(hdr_ia_na
) - 4),
349 struct dhcpv6_ia_addr pa
[ia_na_entries
];
350 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
351 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
352 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
353 pa
[i
].addr
= e
[i
].target
;
359 ia_na_len
= sizeof(pa
);
360 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
362 // Reconfigure Accept
366 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
368 // Request Information Refresh
369 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
371 // Build vendor-class option
372 size_t vendor_class_len
;
373 struct dhcpv6_vendorclass
*vendor_class
= odhcp6c_get_state(STATE_VENDORCLASS
, &vendor_class_len
);
378 } vendor_class_hdr
= {htons(DHCPV6_OPT_VENDOR_CLASS
), htons(vendor_class_len
)};
382 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
386 uint16_t elapsed_type
;
387 uint16_t elapsed_len
;
388 uint16_t elapsed_value
;
392 type
, {trid
[0], trid
[1], trid
[2]},
393 htons(DHCPV6_OPT_ELAPSED
), htons(2),
394 htons((ecs
> 0xffff) ? 0xffff : ecs
),
395 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
398 struct iovec iov
[] = {
403 {srv_id
, srv_id_len
},
404 {&vendor_class_hdr
, vendor_class_len
? sizeof(vendor_class_hdr
) : 0},
405 {vendor_class
, vendor_class_len
},
406 {&reconf_accept
, sizeof(reconf_accept
)},
408 {&hdr_ia_na
, sizeof(hdr_ia_na
)},
413 size_t cnt
= ARRAY_SIZE(iov
);
414 if (type
== DHCPV6_MSG_INFO_REQ
) {
416 iov
[2].iov_len
= sizeof(oro_refresh
);
417 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
418 } else if (!request_prefix
) {
422 // Disable IAs if not used
423 if (type
!= DHCPV6_MSG_SOLICIT
) {
429 if (na_mode
== IA_MODE_NONE
)
432 if (!(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
435 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
438 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
439 0, ALL_DHCPV6_RELAYS
, ifindex
};
440 struct msghdr msg
= {&srv
, sizeof(srv
), iov
, cnt
, NULL
, 0, 0};
442 sendmsg(sock
, &msg
, 0);
446 static int64_t dhcpv6_rand_delay(int64_t time
)
449 odhcp6c_random(&random
, sizeof(random
));
450 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
454 int dhcpv6_request(enum dhcpv6_msg type
)
457 uint64_t timeout
= UINT32_MAX
;
458 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
461 struct timespec ts
= {0, 0};
462 ts
.tv_nsec
= dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY
);
463 nanosleep(&ts
, NULL
);
466 if (type
== DHCPV6_MSG_UNKNOWN
)
468 else if (type
== DHCPV6_MSG_RENEW
)
469 timeout
= (t2
> t1
) ? t2
- t1
: 0;
470 else if (type
== DHCPV6_MSG_REBIND
)
471 timeout
= (t3
> t2
) ? t3
- t2
: 0;
476 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %llus, max rc %d)",
477 retx
->name
, (unsigned long long)timeout
, retx
->max_rc
);
479 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
481 // Generate transaction ID
482 uint8_t trid
[3] = {0, 0, 0};
483 if (type
!= DHCPV6_MSG_UNKNOWN
)
484 odhcp6c_random(trid
, sizeof(trid
));
490 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
492 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
493 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
494 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
496 rto
= (retx
->init_timeo
* 1000 + delay
);
499 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
501 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
502 rto
= retx
->max_timeo
* 1000 +
503 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
505 // Calculate end for this round and elapsed time
506 uint64_t round_end
= round_start
+ rto
;
507 elapsed
= round_start
- start
;
509 // Don't wait too long
510 if (round_end
- start
> timeout
* 1000)
511 round_end
= timeout
* 1000 + start
;
513 // Built and send package
514 if (type
!= DHCPV6_MSG_UNKNOWN
) {
515 if (type
!= DHCPV6_MSG_SOLICIT
)
516 syslog(LOG_NOTICE
, "Send %s message (elapsed %llums, rc %d)",
517 retx
->name
, (unsigned long long)elapsed
, rc
);
518 dhcpv6_send(type
, trid
, elapsed
/ 10);
523 for (; len
< 0 && (round_start
< round_end
);
524 round_start
= odhcp6c_get_milli_time()) {
525 uint8_t buf
[1536], cmsg_buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
526 struct iovec iov
= {buf
, sizeof(buf
)};
527 struct msghdr msg
= {NULL
, 0, &iov
, 1,
528 cmsg_buf
, sizeof(cmsg_buf
), 0};
529 struct in6_pktinfo
*pktinfo
= NULL
;
531 // Check for pending signal
532 if (odhcp6c_signal_process())
535 // Set timeout for receiving
536 uint64_t t
= round_end
- round_start
;
537 struct timeval timeout
= {t
/ 1000, (t
% 1000) * 1000};
538 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
539 &timeout
, sizeof(timeout
));
542 len
= recvmsg(sock
, &msg
, 0);
546 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
547 ch
= CMSG_NXTHDR(&msg
, ch
)) {
548 if (ch
->cmsg_level
== SOL_IPV6
&&
549 ch
->cmsg_type
== IPV6_PKTINFO
) {
550 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
555 if (pktinfo
== NULL
) {
560 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
561 type
, &pktinfo
->ipi6_addr
)) {
566 uint8_t *opt
= &buf
[4];
567 uint8_t *opt_end
= opt
+ len
- 4;
569 round_start
= odhcp6c_get_milli_time();
570 elapsed
= round_start
- start
;
571 syslog(LOG_NOTICE
, "Got a valid reply after "
572 "%llums", (unsigned long long)elapsed
);
574 if (retx
->handler_reply
)
575 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
);
577 if (len
> 0 && round_end
- round_start
> 1000)
578 round_end
= 1000 + round_start
;
582 if (retx
->handler_finish
)
583 len
= retx
->handler_finish();
584 } while (len
< 0 && ((elapsed
/ 1000 < timeout
) && (!retx
->max_rc
|| rc
< retx
->max_rc
)));
589 // Message validation checks according to RFC3315 chapter 15
590 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
591 const uint8_t transaction
[3], enum dhcpv6_msg type
,
592 const struct in6_addr
*daddr
)
594 const struct dhcpv6_header
*rep
= buf
;
595 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
596 transaction
, sizeof(rep
->tr_id
)))
597 return false; // Invalid reply
599 if (type
== DHCPV6_MSG_SOLICIT
) {
600 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
601 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
603 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
604 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
606 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
610 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
611 rcmsg
= DHCPV6_MSG_UNKNOWN
;
612 uint16_t otype
, olen
= UINT16_MAX
;
613 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
614 ia_present
= false, options_valid
= true;
616 size_t client_id_len
, server_id_len
;
617 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
618 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
620 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
621 if (otype
== DHCPV6_OPT_CLIENTID
) {
622 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
623 &odata
[-4], client_id
, client_id_len
);
624 } else if (otype
== DHCPV6_OPT_SERVERID
) {
626 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
627 &odata
[-4], server_id
, server_id_len
);
630 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
631 sizeof(struct dhcpv6_auth_reconfigure
)) {
632 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
633 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
637 uint8_t serverhash
[16], secretbytes
[16], hash
[16];
638 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
639 memset(r
->key
, 0, sizeof(r
->key
));
640 memcpy(secretbytes
, reconf_key
, sizeof(secretbytes
));
642 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
643 secretbytes
[i
] ^= 0x36;
646 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
647 md5_hash(buf
, len
, &md5
);
650 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
651 secretbytes
[i
] ^= 0x36;
652 secretbytes
[i
] ^= 0x5c;
656 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
657 md5_hash(hash
, 16, &md5
);
660 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
661 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
663 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
665 if (olen
< sizeof(struct dhcpv6_ia_hdr
))
666 options_valid
= false;
668 else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
669 (otype
== DHCPV6_OPT_PD_EXCLUDE
)) {
670 // Options are not allowed on global level
671 options_valid
= false;
675 if (!options_valid
|| ((odata
+ olen
) > end
))
678 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
681 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
682 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
683 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
684 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
688 return clientid_ok
&& serverid_ok
;
692 int dhcpv6_poll_reconfigure(void)
694 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
696 ret
= dhcpv6_request(ret
);
702 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
, const int rc
,
703 const void *opt
, const void *end
)
705 uint16_t otype
, olen
;
706 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
707 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
708 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
709 odata
[0] == DHCPV6_MSG_RENEW
||
710 odata
[0] == DHCPV6_MSG_INFO_REQ
))
713 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, rc
, NULL
, NULL
);
718 // Collect all advertised servers
719 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
720 const void *opt
, const void *end
)
722 uint16_t olen
, otype
;
723 uint8_t *odata
, pref
= 0;
724 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
726 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
727 bool have_na
= false;
730 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
731 if (orig
== DHCPV6_MSG_SOLICIT
&&
732 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
733 olen
> sizeof(struct dhcpv6_ia_hdr
)) {
734 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
735 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
738 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
739 memcpy(cand
.duid
, odata
, olen
);
740 cand
.duid_len
= olen
;
741 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
742 int error
= ((int)odata
[0] << 8 | (int)odata
[1]);
745 case DHCPV6_NoPrefixAvail
:
746 // Status code on global level
747 cand
.preference
-= 2000;
753 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
754 cand
.preference
>= 0) {
755 cand
.preference
= pref
= odata
[0];
756 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
757 cand
.wants_reconfigure
= true;
758 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
759 uint32_t sol_max_rt
= ntohl(*((uint32_t *)odata
));
760 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
761 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
762 cand
.sol_max_rt
= sol_max_rt
;
763 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
764 uint32_t inf_max_rt
= ntohl(*((uint32_t *)odata
));
765 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
766 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
767 cand
.inf_max_rt
= inf_max_rt
;
768 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
) {
769 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
770 uint8_t *oend
= odata
+ olen
, *d
;
771 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
772 if (otype
== DHCPV6_OPT_IA_PREFIX
&& (olen
+ 4) >=
773 (uint16_t)sizeof(struct dhcpv6_ia_prefix
)) {
774 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
778 } else if (otype
== DHCPV6_OPT_IA_NA
) {
779 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
780 uint8_t *oend
= odata
+ olen
, *d
;
781 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
)
782 if (otype
== DHCPV6_OPT_IA_ADDR
)
787 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
788 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
790 * RFC7083 states to process the SOL_MAX_RT and
791 * INF_MAX_RT options even if the DHCPv6 server
792 * did not propose any IA_NA and/or IA_PD
794 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
795 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
799 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
800 cand
.has_noaddravail
= true;
801 cand
.preference
-= 1000;
804 if (pd_mode
!= IA_MODE_NONE
) {
806 cand
.preference
+= 2000 + (128 - have_pd
);
808 cand
.preference
-= 2000;
811 if (cand
.duid_len
> 0) {
812 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
813 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
814 dhcpv6_add_server_cand(&cand
);
817 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
821 static int dhcpv6_commit_advert(void)
823 return dhcpv6_promote_server_cand();
827 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
828 const void *opt
, const void *end
)
830 dhcpv6_handle_advert(orig
, rc
, opt
, end
);
831 if (dhcpv6_commit_advert() < 0)
834 return dhcpv6_handle_reply(orig
, rc
, opt
, end
);
838 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
839 const void *opt
, const void *end
)
842 uint16_t otype
, olen
;
843 uint32_t refresh
= UINT32_MAX
;
845 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
849 if (orig
== DHCPV6_MSG_UNKNOWN
) {
850 static time_t last_update
= 0;
851 time_t now
= odhcp6c_get_milli_time() / 1000;
853 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
870 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
871 // Delete NA and PD we have in the state from the Advert
872 odhcp6c_clear_state(STATE_IA_NA
);
873 odhcp6c_clear_state(STATE_IA_PD
);
877 odhcp6c_clear_state(STATE_DNS
);
878 odhcp6c_clear_state(STATE_SEARCH
);
879 odhcp6c_clear_state(STATE_SNTP_IP
);
880 odhcp6c_clear_state(STATE_NTP_IP
);
881 odhcp6c_clear_state(STATE_NTP_FQDN
);
882 odhcp6c_clear_state(STATE_SIP_IP
);
883 odhcp6c_clear_state(STATE_SIP_FQDN
);
884 odhcp6c_clear_state(STATE_AFTR_NAME
);
887 // Parse and find all matching IAs
888 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
889 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
890 && olen
> sizeof(struct dhcpv6_ia_hdr
)) {
891 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
894 if (ia_hdr
->iaid
!= 1 && otype
== DHCPV6_OPT_IA_NA
)
897 uint16_t code
= DHCPV6_Success
;
898 uint16_t stype
, slen
;
900 // Get and handle status code
901 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
902 stype
, slen
, sdata
) {
903 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
904 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
905 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
907 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
909 if (code
== DHCPV6_Success
)
912 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
913 code
, mdata
, mlen
, handled_status_codes
, &ret
);
922 if (code
!= DHCPV6_Success
)
925 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
926 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
927 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
928 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
929 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
931 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
933 else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
935 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
936 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
937 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
938 } else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
940 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
941 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
942 uint16_t stype
, slen
;
944 // Test status and bail if error
945 dhcpv6_for_each_option(odata
, odata
+ olen
,
946 stype
, slen
, sdata
) {
947 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
948 stype
== NTP_SRV_ADDR
))
949 odhcp6c_add_state(STATE_NTP_IP
,
951 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
952 odhcp6c_add_state(STATE_NTP_FQDN
,
955 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
957 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
958 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
959 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
960 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
961 refresh
= ntohl(*((uint32_t*)odata
));
962 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
963 sizeof(struct dhcpv6_auth_reconfigure
)) {
964 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
965 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
967 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
968 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
970 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
972 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
973 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
974 uint32_t sol_max_rt
= ntohl(*((uint32_t *)odata
));
975 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
976 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
977 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
978 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
979 uint32_t inf_max_rt
= ntohl(*((uint32_t *)odata
));
980 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
981 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
982 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
983 }else if (otype
!= DHCPV6_OPT_CLIENTID
&&
984 otype
!= DHCPV6_OPT_SERVERID
) {
985 odhcp6c_add_state(STATE_CUSTOM_OPTS
,
986 &odata
[-4], olen
+ 4);
990 if (orig
!= DHCPV6_MSG_INFO_REQ
) {
991 // Update refresh timers if no fatal status code was received
992 if ((ret
> 0) && dhcpv6_calc_refresh_timers()) {
994 case DHCPV6_MSG_RENEW
:
995 // Send further renews if T1 is not set
999 case DHCPV6_MSG_REBIND
:
1000 // Send further rebinds if T1 and T2 is not set
1005 case DHCPV6_MSG_REQUEST
:
1006 // All server candidates can be cleared if not yet bound
1007 if (!odhcp6c_is_bound())
1008 dhcpv6_clear_all_server_cand();
1016 // All server candidates can be cleared if not yet bound
1017 if (!odhcp6c_is_bound())
1018 dhcpv6_clear_all_server_cand();
1027 static int dhcpv6_parse_ia(void *opt
, void *end
)
1029 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1032 uint16_t otype
, olen
;
1035 t1
= ntohl(ia_hdr
->t1
);
1036 t2
= ntohl(ia_hdr
->t2
);
1041 // Update address IA
1042 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1043 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0,
1044 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0, 0};
1046 entry
.iaid
= ia_hdr
->iaid
;
1048 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1049 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1050 if (olen
+ 4U < sizeof(*prefix
))
1053 entry
.valid
= ntohl(prefix
->valid
);
1054 entry
.preferred
= ntohl(prefix
->preferred
);
1056 if (entry
.preferred
> entry
.valid
)
1059 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1060 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1061 if (entry
.t1
> entry
.t2
)
1062 entry
.t1
= entry
.t2
;
1064 entry
.length
= prefix
->prefix
;
1065 entry
.target
= prefix
->addr
;
1066 uint16_t stype
, slen
;
1069 #ifdef EXT_PREFIX_CLASS
1070 // Find prefix class, if any
1071 dhcpv6_for_each_option(&prefix
[1], odata
+ olen
,
1073 if (stype
== DHCPV6_OPT_PREFIX_CLASS
&& slen
== 2)
1074 entry
.class = sdata
[0] << 8 | sdata
[1];
1079 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1080 odata
+ olen
, stype
, slen
, sdata
) {
1081 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1084 uint8_t elen
= sdata
[0];
1088 if (elen
<= 32 || elen
<= entry
.length
) {
1094 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1095 if (slen
<= bytes
) {
1100 uint32_t exclude
= 0;
1102 exclude
= exclude
<< 8 | sdata
[bytes
];
1105 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1106 exclude
<<= 64 - elen
;
1108 // Abusing router & priority fields for exclusion
1109 entry
.router
= entry
.target
;
1110 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1111 entry
.priority
= elen
;
1115 odhcp6c_update_entry(STATE_IA_PD
, &entry
);
1120 memset(&entry
.router
, 0, sizeof(entry
.router
));
1121 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1122 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1123 if (olen
+ 4U < sizeof(*addr
))
1126 entry
.preferred
= ntohl(addr
->preferred
);
1127 entry
.valid
= ntohl(addr
->valid
);
1129 if (entry
.preferred
> entry
.valid
)
1132 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1133 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1134 if (entry
.t1
> entry
.t2
)
1135 entry
.t1
= entry
.t2
;
1138 entry
.target
= addr
->addr
;
1140 #ifdef EXT_PREFIX_CLASS
1141 uint16_t stype
, slen
;
1143 // Find prefix class, if any
1144 dhcpv6_for_each_option(&addr
[1], odata
+ olen
,
1146 if (stype
== DHCPV6_OPT_PREFIX_CLASS
&& slen
== 2)
1147 entry
.class = sdata
[0] << 8 | sdata
[1];
1150 odhcp6c_update_entry(STATE_IA_NA
, &entry
);
1158 static int dhcpv6_calc_refresh_timers(void)
1160 struct odhcp6c_entry
*e
;
1161 size_t ia_na_entries
, ia_pd_entries
, i
;
1162 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1164 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1165 ia_na_entries
/= sizeof(*e
);
1166 for (i
= 0; i
< ia_na_entries
; i
++) {
1173 if (e
[i
].valid
> l_t3
)
1177 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1178 ia_pd_entries
/= sizeof(*e
);
1179 for (i
= 0; i
< ia_pd_entries
; i
++) {
1186 if (e
[i
].valid
> l_t3
)
1190 if (ia_pd_entries
|| ia_na_entries
) {
1198 return (int)(ia_pd_entries
+ ia_na_entries
);
1202 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1203 const void *status_msg
, const int len
)
1205 uint8_t buf
[len
+ 3];
1207 memset(buf
, 0, sizeof(buf
));
1210 memcpy(&buf
[1], status_msg
, len
);
1214 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1219 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1220 const uint16_t code
, const void *status_msg
, const int len
,
1223 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1226 case DHCPV6_UnspecFail
:
1231 case DHCPV6_UseMulticast
:
1232 // TODO handle multicast status code
1235 case DHCPV6_NoAddrsAvail
:
1236 case DHCPV6_NoPrefixAvail
:
1237 if (orig
== DHCPV6_MSG_REQUEST
)
1238 *ret
= 0; // Failure
1247 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1248 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1249 const void *status_msg
, const int len
,
1250 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1252 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1253 "IA_NA" : "IA_PD", status_msg
, len
);
1256 case DHCPV6_NoBinding
:
1258 case DHCPV6_MSG_RENEW
:
1259 case DHCPV6_MSG_REBIND
:
1260 if ((*ret
> 0) && !handled_status_codes
[code
])
1261 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1269 case DHCPV6_NoAddrsAvail
:
1270 case DHCPV6_NoPrefixAvail
:
1272 case DHCPV6_MSG_REQUEST
:
1281 case DHCPV6_NotOnLink
:
1282 // TODO handle not onlink in case of confirm
1290 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1293 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1295 // Remove identical duid server candidate
1296 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1297 if (cand
->duid_len
== c
[i
].duid_len
&&
1298 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1301 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1306 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1307 i
< cand_len
/ sizeof(*c
); ++i
) {
1308 if (c
[i
].preference
< cand
->preference
)
1312 odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
));
1315 static void dhcpv6_clear_all_server_cand(void)
1318 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1320 // Server candidates need deep delete for IA_NA/IA_PD
1321 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1325 odhcp6c_clear_state(STATE_SERVER_CAND
);
1328 int dhcpv6_promote_server_cand(void)
1331 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1333 int ret
= (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
) ?
1334 DHCPV6_STATELESS
: DHCPV6_STATEFUL
;
1336 // Clear lingering candidate state info
1337 odhcp6c_clear_state(STATE_SERVER_ID
);
1338 odhcp6c_clear_state(STATE_IA_NA
);
1339 odhcp6c_clear_state(STATE_IA_PD
);
1344 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1345 na_mode
= IA_MODE_NONE
;
1347 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1348 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1350 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1353 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1354 hdr
[1] = htons(cand
->duid_len
);
1355 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1356 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1357 accept_reconfig
= cand
->wants_reconfigure
;
1358 if (cand
->ia_na_len
) {
1359 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1361 if (na_mode
!= IA_MODE_NONE
)
1362 ret
= DHCPV6_STATEFUL
;
1364 if (cand
->ia_pd_len
) {
1365 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1368 ret
= DHCPV6_STATEFUL
;
1371 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1372 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1374 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));