2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2017-2018 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
30 #include <sys/ioctl.h>
31 #include <sys/socket.h>
32 #include <arpa/inet.h>
33 #include <netinet/in.h>
36 #include <net/ethernet.h>
40 #include <libubox/md5.h>
46 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
47 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
48 #define DHCPV6_CLIENT_PORT 546
49 #define DHCPV6_SERVER_PORT 547
50 #define DHCPV6_DUID_LLADDR 3
51 #define DHCPV6_REQ_DELAY 1
53 #define DHCPV6_SOL_MAX_RT_MIN 60
54 #define DHCPV6_SOL_MAX_RT_MAX 86400
55 #define DHCPV6_INF_MAX_RT_MIN 60
56 #define DHCPV6_INF_MAX_RT_MAX 86400
58 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
59 const uint8_t transaction
[3], enum dhcpv6_msg type
,
60 const struct in6_addr
*daddr
);
62 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
);
64 static int dhcpv6_calc_refresh_timers(void);
65 static void dhcpv6_handle_status_code(_unused
const enum dhcpv6_msg orig
,
66 const uint16_t code
, const void *status_msg
, const int len
,
68 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
69 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
70 const void *status_msg
, const int len
,
71 bool handled_status_codes
[_DHCPV6_Status_Max
],
73 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
);
74 static void dhcpv6_clear_all_server_cand(void);
76 static reply_handler dhcpv6_handle_reply
;
77 static reply_handler dhcpv6_handle_advert
;
78 static reply_handler dhcpv6_handle_rebind_reply
;
79 static reply_handler dhcpv6_handle_reconfigure
;
80 static int dhcpv6_commit_advert(void);
82 // RFC 3315 - 5.5 Timeout and Delay values
83 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
84 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, 0, "<POLL>",
85 dhcpv6_handle_reconfigure
, NULL
},
86 [DHCPV6_MSG_SOLICIT
] = {true, 1, DHCPV6_SOL_MAX_RT
, 0, "SOLICIT",
87 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
88 [DHCPV6_MSG_REQUEST
] = {true, 1, DHCPV6_REQ_MAX_RT
, 10, "REQUEST",
89 dhcpv6_handle_reply
, NULL
},
90 [DHCPV6_MSG_RENEW
] = {false, 10, DHCPV6_REN_MAX_RT
, 0, "RENEW",
91 dhcpv6_handle_reply
, NULL
},
92 [DHCPV6_MSG_REBIND
] = {false, 10, DHCPV6_REB_MAX_RT
, 0, "REBIND",
93 dhcpv6_handle_rebind_reply
, NULL
},
94 [DHCPV6_MSG_RELEASE
] = {false, 1, 0, 5, "RELEASE", NULL
, NULL
},
95 [DHCPV6_MSG_DECLINE
] = {false, 1, 0, 5, "DECLINE", NULL
, NULL
},
96 [DHCPV6_MSG_INFO_REQ
] = {true, 1, DHCPV6_INF_MAX_RT
, 0, "INFOREQ",
97 dhcpv6_handle_reply
, NULL
},
101 static int sock
= -1;
102 static int ifindex
= -1;
103 static int64_t t1
= 0, t2
= 0, t3
= 0;
106 static int request_prefix
= -1;
107 static enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
, pd_mode
= IA_MODE_NONE
;
108 static bool accept_reconfig
= false;
109 // Server unicast address
110 static struct in6_addr server_addr
= IN6ADDR_ANY_INIT
;
113 static uint8_t reconf_key
[16];
116 static unsigned int client_options
= 0;
118 static uint32_t ntohl_unaligned(const uint8_t *data
)
122 memcpy(&buf
, data
, sizeof(buf
));
126 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
128 client_options
= options
;
129 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
131 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
137 memset(&ifr
, 0, sizeof(ifr
));
138 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
) - 1);
139 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
142 ifindex
= ifr
.ifr_ifindex
;
144 // Create client DUID
145 size_t client_id_len
;
146 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
147 if (client_id_len
== 0) {
148 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
149 DHCPV6_DUID_LLADDR
, 0, 1};
151 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
152 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
154 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
155 struct ifreq ifs
[100], *ifp
, *ifend
;
158 ifc
.ifc_len
= sizeof(ifs
);
160 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
161 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
162 // If our interface doesn't have an address...
163 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
164 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
165 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
166 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
167 sizeof(ifr
.ifr_name
));
168 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
171 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
176 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
180 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
182 htons(DHCPV6_OPT_SIP_SERVER_D
),
183 htons(DHCPV6_OPT_SIP_SERVER_A
),
184 htons(DHCPV6_OPT_DNS_SERVERS
),
185 htons(DHCPV6_OPT_DNS_DOMAIN
),
186 htons(DHCPV6_OPT_UNICAST
),
187 htons(DHCPV6_OPT_SNTP_SERVERS
),
188 htons(DHCPV6_OPT_NTP_SERVER
),
189 htons(DHCPV6_OPT_AFTR_NAME
),
190 htons(DHCPV6_OPT_PD_EXCLUDE
),
191 htons(DHCPV6_OPT_SOL_MAX_RT
),
192 htons(DHCPV6_OPT_INF_MAX_RT
),
194 htons(DHCPV6_OPT_CER_ID
),
196 htons(DHCPV6_OPT_S46_CONT_MAPE
),
197 htons(DHCPV6_OPT_S46_CONT_MAPT
),
198 htons(DHCPV6_OPT_S46_CONT_LW
),
200 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
203 // Configure IPv6-options
205 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
)) < 0)
208 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
)) < 0)
211 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
)) < 0)
214 if (setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
)) < 0)
217 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
218 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
220 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
247 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
249 int mode
= DHCPV6_UNKNOWN
;
254 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
255 mode
= DHCPV6_STATELESS
;
256 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
257 mode
= DHCPV6_STATEFUL
;
262 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
266 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
273 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
274 sizeof(fqdn
.data
), NULL
, NULL
);
275 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
276 fqdn
.len
= htons(fqdn_len
- 4);
281 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
285 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
288 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
291 if (type
== DHCPV6_MSG_SOLICIT
) {
292 odhcp6c_clear_state(STATE_IA_PD
);
294 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
295 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
297 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
299 for (size_t i
= 0; i
< n_prefixes
; i
++) {
300 struct dhcpv6_ia_hdr hdr_ia_pd
= {
301 htons(DHCPV6_OPT_IA_PD
),
302 htons(sizeof(hdr_ia_pd
) - 4 +
303 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
304 request_prefixes
[i
].iaid
, 0, 0
306 struct dhcpv6_ia_prefix pref
= {
307 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
308 .len
= htons(sizeof(pref
) - 4),
309 .prefix
= request_prefixes
[i
].length
311 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
312 ia_pd_len
+= sizeof(hdr_ia_pd
);
313 if (request_prefixes
[i
].length
) {
314 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
315 ia_pd_len
+= sizeof(pref
);
319 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
320 ia_pd_entries
/= sizeof(*e
);
322 // we're too lazy to count our distinct IAIDs,
323 // so just allocate maximally needed space
324 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
325 sizeof(struct dhcpv6_ia_hdr
)));
327 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
328 uint32_t iaid
= e
[i
].iaid
;
330 // check if this is an unprocessed IAID and skip if not.
332 for (int j
= i
-1; j
>= 0; j
--) {
333 if (e
[j
].iaid
== iaid
) {
343 struct dhcpv6_ia_hdr hdr_ia_pd
= {
344 htons(DHCPV6_OPT_IA_PD
),
345 htons(sizeof(hdr_ia_pd
) - 4),
349 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
350 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
351 ia_pd_len
+= sizeof(hdr_ia_pd
);
353 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
354 if (e
[j
].iaid
!= iaid
)
358 if (e
[j
].priority
> 0)
359 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
361 struct dhcpv6_ia_prefix p
= {
362 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
363 .len
= htons(sizeof(p
) - 4U + ex_len
),
364 .prefix
= e
[j
].length
,
368 if (type
== DHCPV6_MSG_REQUEST
) {
369 p
.preferred
= htonl(e
[j
].preferred
);
370 p
.valid
= htonl(e
[j
].valid
);
373 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
374 ia_pd_len
+= sizeof(p
);
377 ia_pd
[ia_pd_len
++] = 0;
378 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
379 ia_pd
[ia_pd_len
++] = 0;
380 ia_pd
[ia_pd_len
++] = ex_len
- 4;
381 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
383 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
384 excl
>>= (64 - e
[j
].priority
);
385 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
387 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
388 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
389 ia_pd_len
+= ex_len
- 5;
392 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
397 if (ia_pd_entries
> 0)
401 size_t ia_na_entries
, ia_na_len
= 0;
403 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
404 ia_na_entries
/= sizeof(*e
);
406 struct dhcpv6_ia_hdr hdr_ia_na
= {
407 htons(DHCPV6_OPT_IA_NA
),
408 htons(sizeof(hdr_ia_na
) - 4),
412 struct dhcpv6_ia_addr pa
[ia_na_entries
];
413 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
414 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
415 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
416 pa
[i
].addr
= e
[i
].target
;
418 if (type
== DHCPV6_MSG_REQUEST
) {
419 pa
[i
].preferred
= htonl(e
[i
].preferred
);
420 pa
[i
].valid
= htonl(e
[i
].valid
);
428 ia_na_len
= sizeof(pa
);
429 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
431 // Reconfigure Accept
435 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
437 // Request Information Refresh
438 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
442 void *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
446 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
450 uint16_t elapsed_type
;
451 uint16_t elapsed_len
;
452 uint16_t elapsed_value
;
456 type
, {trid
[0], trid
[1], trid
[2]},
457 htons(DHCPV6_OPT_ELAPSED
), htons(2),
458 htons((ecs
> 0xffff) ? 0xffff : ecs
),
459 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
462 struct iovec iov
[IOV_TOTAL
] = {
463 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
464 [IOV_ORO
] = {oro
, oro_len
},
465 [IOV_ORO_REFRESH
] = {&oro_refresh
, 0},
466 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
467 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
468 [IOV_OPTS
] = { opts
, opts_len
},
469 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
470 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
471 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
472 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
473 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
476 size_t cnt
= IOV_TOTAL
;
477 if (type
== DHCPV6_MSG_INFO_REQ
) {
479 iov
[IOV_ORO_REFRESH
].iov_len
= sizeof(oro_refresh
);
480 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
481 } else if (!request_prefix
)
484 // Disable IAs if not used
485 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
486 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
488 if (na_mode
== IA_MODE_NONE
)
489 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
491 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
492 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
493 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
495 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
496 iov
[IOV_FQDN
].iov_len
= 0;
498 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
499 0, ALL_DHCPV6_RELAYS
, ifindex
};
500 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
501 .msg_iov
= iov
, .msg_iovlen
= cnt
};
504 case DHCPV6_MSG_REQUEST
:
505 case DHCPV6_MSG_RENEW
:
506 case DHCPV6_MSG_RELEASE
:
507 case DHCPV6_MSG_DECLINE
:
508 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr
) &&
509 odhcp6c_addr_in_scope(&server_addr
)) {
510 srv
.sin6_addr
= server_addr
;
511 if (!IN6_IS_ADDR_LINKLOCAL(&server_addr
))
512 srv
.sin6_scope_id
= 0;
519 if (sendmsg(sock
, &msg
, 0) < 0) {
520 char in6_str
[INET6_ADDRSTRLEN
];
522 syslog(LOG_ERR
, "Failed to send DHCPV6 message to %s (%s)",
523 inet_ntop(AF_INET6
, (const void *)&srv
.sin6_addr
,
524 in6_str
, sizeof(in6_str
)), strerror(errno
));
528 static int64_t dhcpv6_rand_delay(int64_t time
)
531 odhcp6c_random(&random
, sizeof(random
));
533 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
536 int dhcpv6_request(enum dhcpv6_msg type
)
539 uint64_t timeout
= UINT32_MAX
;
540 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
543 struct timespec ts
= {0, 0};
544 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
546 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
549 if (type
== DHCPV6_MSG_UNKNOWN
)
551 else if (type
== DHCPV6_MSG_RENEW
)
552 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
553 else if (type
== DHCPV6_MSG_REBIND
)
554 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
559 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %"PRIu64
"s, max rc %d)",
560 retx
->name
, timeout
, retx
->max_rc
);
562 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
564 // Generate transaction ID
565 uint8_t trid
[3] = {0, 0, 0};
566 if (type
!= DHCPV6_MSG_UNKNOWN
)
567 odhcp6c_random(trid
, sizeof(trid
));
574 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
576 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
577 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
578 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
580 rto
= (retx
->init_timeo
* 1000 + delay
);
582 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
584 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
585 rto
= retx
->max_timeo
* 1000 +
586 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
588 // Calculate end for this round and elapsed time
589 uint64_t round_end
= round_start
+ rto
;
590 elapsed
= round_start
- start
;
592 // Don't wait too long if timeout differs from infinite
593 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
594 round_end
= timeout
* 1000 + start
;
596 // Built and send package
598 case DHCPV6_MSG_UNKNOWN
:
601 syslog(LOG_NOTICE
, "Send %s message (elapsed %"PRIu64
"ms, rc %d)",
602 retx
->name
, elapsed
, rc
);
604 case DHCPV6_MSG_SOLICIT
:
605 case DHCPV6_MSG_INFO_REQ
:
606 dhcpv6_send(type
, trid
, elapsed
/ 10);
611 for (; len
< 0 && (round_start
< round_end
);
612 round_start
= odhcp6c_get_milli_time()) {
616 uint8_t buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
618 struct iovec iov
= {buf
, sizeof(buf
)};
619 struct sockaddr_in6 addr
;
620 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
621 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
.buf
,
622 .msg_controllen
= sizeof(cmsg_buf
)};
623 struct in6_pktinfo
*pktinfo
= NULL
;
625 // Check for pending signal
626 if (odhcp6c_signal_process())
629 // Set timeout for receiving
630 uint64_t t
= round_end
- round_start
;
631 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
632 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
633 &tv
, sizeof(tv
)) < 0)
634 syslog(LOG_ERR
, "setsockopt SO_RCVTIMEO failed (%s)",
638 len
= recvmsg(sock
, &msg
, 0);
642 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
643 ch
= CMSG_NXTHDR(&msg
, ch
)) {
644 if (ch
->cmsg_level
== SOL_IPV6
&&
645 ch
->cmsg_type
== IPV6_PKTINFO
) {
646 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
651 if (pktinfo
== NULL
) {
656 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
657 type
, &pktinfo
->ipi6_addr
)) {
662 uint8_t *opt
= &buf
[4];
663 uint8_t *opt_end
= opt
+ len
- 4;
665 round_start
= odhcp6c_get_milli_time();
666 elapsed
= round_start
- start
;
667 syslog(LOG_NOTICE
, "Got a valid reply after %"PRIu64
"ms",
670 if (retx
->handler_reply
)
671 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
673 if (len
> 0 && round_end
- round_start
> 1000)
674 round_end
= 1000 + round_start
;
678 if (retx
->handler_finish
)
679 len
= retx
->handler_finish();
680 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
681 (!retx
->max_rc
|| rc
< retx
->max_rc
));
685 // Message validation checks according to RFC3315 chapter 15
686 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
687 const uint8_t transaction
[3], enum dhcpv6_msg type
,
688 const struct in6_addr
*daddr
)
690 const struct dhcpv6_header
*rep
= buf
;
691 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
692 transaction
, sizeof(rep
->tr_id
)))
693 return false; // Invalid reply
695 if (type
== DHCPV6_MSG_SOLICIT
) {
696 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
697 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
700 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
701 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
704 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
)
707 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
708 rcmsg
= DHCPV6_MSG_UNKNOWN
;
709 uint16_t otype
, olen
= UINT16_MAX
;
710 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
711 ia_present
= false, options_valid
= true;
713 size_t client_id_len
, server_id_len
;
714 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
715 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
717 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
718 if (otype
== DHCPV6_OPT_CLIENTID
) {
719 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
720 &odata
[-4], client_id
, client_id_len
);
721 } else if (otype
== DHCPV6_OPT_SERVERID
) {
723 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
724 &odata
[-4], server_id
, server_id_len
);
727 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
728 sizeof(struct dhcpv6_auth_reconfigure
)) {
729 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
730 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
734 uint8_t serverhash
[16], secretbytes
[64];
736 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
737 memset(r
->key
, 0, sizeof(r
->key
));
739 memset(secretbytes
, 0, sizeof(secretbytes
));
740 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
742 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
743 secretbytes
[i
] ^= 0x36;
746 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
747 md5_hash(buf
, len
, &md5
);
750 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
751 secretbytes
[i
] ^= 0x36;
752 secretbytes
[i
] ^= 0x5c;
756 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
757 md5_hash(hash
, 16, &md5
);
760 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
761 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
763 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
765 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
766 options_valid
= false;
767 } else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
768 (otype
== DHCPV6_OPT_PD_EXCLUDE
))
769 // Options are not allowed on global level
770 options_valid
= false;
773 if (!options_valid
|| ((odata
+ olen
) > end
))
776 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
779 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
780 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_REBIND
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
781 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
782 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
786 return clientid_ok
&& serverid_ok
;
789 int dhcpv6_poll_reconfigure(void)
791 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
794 ret
= dhcpv6_request(ret
);
799 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig
, const int rc
,
800 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
802 uint16_t otype
, olen
;
806 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
807 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
809 case DHCPV6_MSG_REBIND
:
810 if (t2
!= UINT32_MAX
)
813 case DHCPV6_MSG_RENEW
:
814 if (t1
!= UINT32_MAX
)
817 case DHCPV6_MSG_INFO_REQ
:
827 dhcpv6_handle_reply(orig
, rc
, NULL
, NULL
, NULL
);
832 // Collect all advertised servers
833 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
834 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
836 uint16_t olen
, otype
;
837 uint8_t *odata
, pref
= 0;
838 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
839 IN6ADDR_ANY_INIT
, DHCPV6_SOL_MAX_RT
,
840 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
841 bool have_na
= false;
844 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
845 if (orig
== DHCPV6_MSG_SOLICIT
&&
846 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
847 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
848 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
849 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
852 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
853 memcpy(cand
.duid
, odata
, olen
);
854 cand
.duid_len
= olen
;
855 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
856 cand
.preference
>= 0) {
857 cand
.preference
= pref
= odata
[0];
858 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(cand
.server_addr
)) {
859 cand
.server_addr
= *(struct in6_addr
*)odata
;
860 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
861 cand
.wants_reconfigure
= true;
862 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
863 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
864 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
865 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
866 cand
.sol_max_rt
= sol_max_rt
;
868 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
869 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
870 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
871 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
872 cand
.inf_max_rt
= inf_max_rt
;
874 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
&&
875 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
876 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
877 uint8_t *oend
= odata
+ olen
, *d
;
878 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
879 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
880 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
881 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
885 } else if (otype
== DHCPV6_OPT_IA_NA
&&
886 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
887 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
888 uint8_t *oend
= odata
+ olen
, *d
;
890 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
891 if (otype
== DHCPV6_OPT_IA_ADDR
&&
892 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
898 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
899 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
901 * RFC7083 states to process the SOL_MAX_RT and
902 * INF_MAX_RT options even if the DHCPv6 server
903 * did not propose any IA_NA and/or IA_PD
905 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
906 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
910 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
911 cand
.has_noaddravail
= true;
912 cand
.preference
-= 1000;
915 if (pd_mode
!= IA_MODE_NONE
) {
917 cand
.preference
+= 2000 + (128 - have_pd
);
919 cand
.preference
-= 2000;
922 if (cand
.duid_len
> 0) {
923 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
924 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
925 dhcpv6_add_server_cand(&cand
);
928 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
931 static int dhcpv6_commit_advert(void)
933 return dhcpv6_promote_server_cand();
936 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
937 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
939 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
940 if (dhcpv6_commit_advert() < 0)
943 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
946 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
947 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
950 uint16_t otype
, olen
;
951 uint32_t refresh
= 86400;
953 unsigned int updated_IAs
= 0;
954 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
958 if (orig
== DHCPV6_MSG_UNKNOWN
) {
959 static time_t last_update
= 0;
960 time_t now
= odhcp6c_get_milli_time() / 1000;
962 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
965 if (t1
!= UINT32_MAX
)
968 if (t2
!= UINT32_MAX
)
971 if (t3
!= UINT32_MAX
)
984 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
985 // Delete NA and PD we have in the state from the Advert
986 odhcp6c_clear_state(STATE_IA_NA
);
987 odhcp6c_clear_state(STATE_IA_PD
);
991 odhcp6c_clear_state(STATE_DNS
);
992 odhcp6c_clear_state(STATE_SEARCH
);
993 odhcp6c_clear_state(STATE_SNTP_IP
);
994 odhcp6c_clear_state(STATE_NTP_IP
);
995 odhcp6c_clear_state(STATE_NTP_FQDN
);
996 odhcp6c_clear_state(STATE_SIP_IP
);
997 odhcp6c_clear_state(STATE_SIP_FQDN
);
998 odhcp6c_clear_state(STATE_AFTR_NAME
);
999 odhcp6c_clear_state(STATE_CER
);
1000 odhcp6c_clear_state(STATE_S46_MAPT
);
1001 odhcp6c_clear_state(STATE_S46_MAPE
);
1002 odhcp6c_clear_state(STATE_S46_LW
);
1003 odhcp6c_clear_state(STATE_PASSTHRU
);
1004 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
1006 // Parse and find all matching IAs
1007 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
1008 struct odhcp6c_opt
*dopt
= odhcp6c_find_opt(otype
);
1010 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
1011 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
1012 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
1014 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
1015 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
1019 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
1022 uint16_t code
= DHCPV6_Success
;
1023 uint16_t stype
, slen
;
1025 // Get and handle status code
1026 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
1027 stype
, slen
, sdata
) {
1028 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
1029 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
1030 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
1032 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
1034 if (code
== DHCPV6_Success
)
1037 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
1038 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1047 if (code
!= DHCPV6_Success
)
1050 updated_IAs
+= dhcpv6_parse_ia(ia_hdr
, odata
+ olen
);
1051 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(server_addr
))
1052 server_addr
= *(struct in6_addr
*)odata
;
1053 else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1054 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1055 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1056 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1058 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1059 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1061 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1062 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
)
1063 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1064 else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1066 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1067 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1068 uint16_t stype
, slen
;
1070 // Test status and bail if error
1071 dhcpv6_for_each_option(odata
, odata
+ olen
,
1072 stype
, slen
, sdata
) {
1073 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1074 stype
== NTP_SRV_ADDR
))
1075 odhcp6c_add_state(STATE_NTP_IP
,
1077 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1078 odhcp6c_add_state(STATE_NTP_FQDN
,
1081 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1083 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1084 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
)
1085 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1086 else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1087 refresh
= ntohl_unaligned(odata
);
1088 } else if (otype
== DHCPV6_OPT_AUTH
) {
1089 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1090 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1091 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1092 r
->reconf_type
== 1)
1093 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1095 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1097 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1099 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1100 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1101 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1102 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1103 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1104 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1105 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1106 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1107 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1108 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1109 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1111 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1112 sizeof(struct dhcpv6_cer_id
)) {
1113 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1114 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1115 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1116 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1118 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1119 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1120 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1122 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1124 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1125 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1126 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1128 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1130 if (!dopt
|| !(dopt
->flags
& OPT_NO_PASSTHRU
))
1131 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1136 case DHCPV6_MSG_REQUEST
:
1137 case DHCPV6_MSG_REBIND
:
1138 case DHCPV6_MSG_RENEW
:
1139 // Update refresh timers if no fatal status code was received
1140 if ((ret
> 0) && (ret
= dhcpv6_calc_refresh_timers())) {
1141 if (orig
== DHCPV6_MSG_REQUEST
) {
1142 // All server candidates can be cleared if not yet bound
1143 if (!odhcp6c_is_bound())
1144 dhcpv6_clear_all_server_cand();
1146 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1147 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1148 } else if (orig
== DHCPV6_MSG_RENEW
) {
1149 // Send further renews if T1 is not set and
1154 else if ((t2
- t1
) > 1)
1155 // Grace period of 1 second
1159 } else if (orig
== DHCPV6_MSG_REBIND
) {
1160 // Send further rebinds if T1 and T2 is not set and
1165 else if ((t3
- t2
) > 1)
1166 // Grace period of 1 second
1170 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1171 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1176 case DHCPV6_MSG_INFO_REQ
:
1178 // All server candidates can be cleared if not yet bound
1179 if (!odhcp6c_is_bound())
1180 dhcpv6_clear_all_server_cand();
1193 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
)
1195 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1196 unsigned int updated_IAs
= 0;
1198 uint16_t otype
, olen
;
1201 t1
= ntohl(ia_hdr
->t1
);
1202 t2
= ntohl(ia_hdr
->t2
);
1207 // Update address IA
1208 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1209 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0, 0,
1210 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0};
1212 entry
.iaid
= ia_hdr
->iaid
;
1214 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1215 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1216 if (olen
+ 4U < sizeof(*prefix
))
1219 entry
.valid
= ntohl(prefix
->valid
);
1220 entry
.preferred
= ntohl(prefix
->preferred
);
1222 if (entry
.preferred
> entry
.valid
)
1225 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1226 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1227 if (entry
.t1
> entry
.t2
)
1228 entry
.t1
= entry
.t2
;
1230 entry
.length
= prefix
->prefix
;
1231 entry
.target
= prefix
->addr
;
1232 uint16_t stype
, slen
;
1237 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1238 odata
+ olen
, stype
, slen
, sdata
) {
1239 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1242 uint8_t elen
= sdata
[0];
1246 if (entry
.length
< 32 || elen
<= entry
.length
) {
1251 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1252 if (slen
<= bytes
) {
1257 uint32_t exclude
= 0;
1259 exclude
= exclude
<< 8 | sdata
[bytes
];
1262 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1263 exclude
<<= 64 - elen
;
1265 // Abusing router & priority fields for exclusion
1266 entry
.router
= entry
.target
;
1267 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1268 entry
.priority
= elen
;
1272 if (odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, 0))
1277 memset(&entry
.router
, 0, sizeof(entry
.router
));
1278 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1279 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1280 if (olen
+ 4U < sizeof(*addr
))
1283 entry
.preferred
= ntohl(addr
->preferred
);
1284 entry
.valid
= ntohl(addr
->valid
);
1286 if (entry
.preferred
> entry
.valid
)
1289 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1290 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1291 if (entry
.t1
> entry
.t2
)
1292 entry
.t1
= entry
.t2
;
1295 entry
.target
= addr
->addr
;
1297 if (odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, 0))
1304 static int dhcpv6_calc_refresh_timers(void)
1306 struct odhcp6c_entry
*e
;
1307 size_t ia_na_entries
, ia_pd_entries
, i
;
1308 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1310 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1311 ia_na_entries
/= sizeof(*e
);
1313 for (i
= 0; i
< ia_na_entries
; i
++) {
1320 if (e
[i
].valid
> l_t3
)
1324 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1325 ia_pd_entries
/= sizeof(*e
);
1327 for (i
= 0; i
< ia_pd_entries
; i
++) {
1334 if (e
[i
].valid
> l_t3
)
1338 if (ia_pd_entries
|| ia_na_entries
) {
1344 return (int)(ia_pd_entries
+ ia_na_entries
);
1347 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1348 const void *status_msg
, int len
)
1350 const char *src
= status_msg
;
1357 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1366 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1370 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1371 const uint16_t code
, const void *status_msg
, const int len
,
1374 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1377 case DHCPV6_UnspecFail
:
1382 case DHCPV6_UseMulticast
:
1384 case DHCPV6_MSG_REQUEST
:
1385 case DHCPV6_MSG_RENEW
:
1386 case DHCPV6_MSG_RELEASE
:
1387 case DHCPV6_MSG_DECLINE
:
1388 // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1389 server_addr
= in6addr_any
;
1397 case DHCPV6_NoAddrsAvail
:
1398 case DHCPV6_NoPrefixAvail
:
1399 if (orig
== DHCPV6_MSG_REQUEST
)
1400 *ret
= 0; // Failure
1408 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1409 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1410 const void *status_msg
, const int len
,
1411 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1413 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1414 "IA_NA" : "IA_PD", status_msg
, len
);
1417 case DHCPV6_NoBinding
:
1419 case DHCPV6_MSG_RENEW
:
1420 case DHCPV6_MSG_REBIND
:
1421 if ((*ret
> 0) && !handled_status_codes
[code
])
1422 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1436 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1437 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1440 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1442 // Remove identical duid server candidate
1443 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1444 if (cand
->duid_len
== c
[i
].duid_len
&&
1445 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1448 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1453 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1454 i
< cand_len
/ sizeof(*c
); ++i
) {
1455 if (c
[i
].preference
< cand
->preference
)
1459 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1465 static void dhcpv6_clear_all_server_cand(void)
1468 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1470 // Server candidates need deep delete for IA_NA/IA_PD
1471 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1475 odhcp6c_clear_state(STATE_SERVER_CAND
);
1478 int dhcpv6_promote_server_cand(void)
1481 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1483 int ret
= DHCPV6_STATELESS
;
1485 // Clear lingering candidate state info
1486 odhcp6c_clear_state(STATE_SERVER_ID
);
1487 odhcp6c_clear_state(STATE_IA_NA
);
1488 odhcp6c_clear_state(STATE_IA_PD
);
1493 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1494 na_mode
= IA_MODE_NONE
;
1496 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1497 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1499 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1502 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1503 hdr
[1] = htons(cand
->duid_len
);
1504 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1505 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1506 accept_reconfig
= cand
->wants_reconfigure
;
1508 if (cand
->ia_na_len
) {
1509 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1511 if (na_mode
!= IA_MODE_NONE
)
1512 ret
= DHCPV6_STATEFUL
;
1515 if (cand
->ia_pd_len
) {
1516 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1519 ret
= DHCPV6_STATEFUL
;
1522 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1523 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1525 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));