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 enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
, pd_mode
= IA_MODE_NONE
;
107 static bool accept_reconfig
= false;
108 // Server unicast address
109 static struct in6_addr server_addr
= IN6ADDR_ANY_INIT
;
112 static uint8_t reconf_key
[16];
115 static unsigned int client_options
= 0;
117 static uint32_t ntohl_unaligned(const uint8_t *data
)
121 memcpy(&buf
, data
, sizeof(buf
));
125 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
127 client_options
= options
;
128 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
130 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
136 memset(&ifr
, 0, sizeof(ifr
));
137 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
) - 1);
138 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
141 ifindex
= ifr
.ifr_ifindex
;
143 // Create client DUID
144 size_t client_id_len
;
145 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
146 if (client_id_len
== 0) {
147 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
148 DHCPV6_DUID_LLADDR
, 0, 1};
150 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
151 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
153 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
154 struct ifreq ifs
[100], *ifp
, *ifend
;
157 ifc
.ifc_len
= sizeof(ifs
);
159 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
160 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
161 // If our interface doesn't have an address...
162 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
163 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
164 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
165 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
166 sizeof(ifr
.ifr_name
));
167 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
170 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
175 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
179 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
181 htons(DHCPV6_OPT_SIP_SERVER_D
),
182 htons(DHCPV6_OPT_SIP_SERVER_A
),
183 htons(DHCPV6_OPT_DNS_SERVERS
),
184 htons(DHCPV6_OPT_DNS_DOMAIN
),
185 htons(DHCPV6_OPT_SNTP_SERVERS
),
186 htons(DHCPV6_OPT_NTP_SERVER
),
187 htons(DHCPV6_OPT_AFTR_NAME
),
188 htons(DHCPV6_OPT_PD_EXCLUDE
),
190 htons(DHCPV6_OPT_CER_ID
),
192 htons(DHCPV6_OPT_S46_CONT_MAPE
),
193 htons(DHCPV6_OPT_S46_CONT_MAPT
),
194 htons(DHCPV6_OPT_S46_CONT_LW
),
196 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
199 uint16_t req_oro
[] = {
200 htons(DHCPV6_OPT_INF_MAX_RT
),
201 htons(DHCPV6_OPT_SOL_MAX_RT
),
202 htons(DHCPV6_OPT_INFO_REFRESH
),
204 odhcp6c_add_state(STATE_ORO
, req_oro
, sizeof(req_oro
));
206 // Configure IPv6-options
208 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
)) < 0)
211 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
)) < 0)
214 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
)) < 0)
217 if (setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
)) < 0)
220 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
221 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
223 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
249 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
251 int mode
= DHCPV6_UNKNOWN
;
256 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
257 mode
= DHCPV6_STATELESS
;
258 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
259 mode
= DHCPV6_STATEFUL
;
264 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
268 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
275 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
276 sizeof(fqdn
.data
), NULL
, NULL
);
277 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
278 fqdn
.len
= htons(fqdn_len
- 4);
283 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
287 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
290 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
293 if (type
== DHCPV6_MSG_SOLICIT
) {
294 odhcp6c_clear_state(STATE_IA_PD
);
296 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
297 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
299 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
301 for (size_t i
= 0; i
< n_prefixes
; i
++) {
302 struct dhcpv6_ia_hdr hdr_ia_pd
= {
303 htons(DHCPV6_OPT_IA_PD
),
304 htons(sizeof(hdr_ia_pd
) - 4 +
305 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
306 request_prefixes
[i
].iaid
, 0, 0
308 struct dhcpv6_ia_prefix pref
= {
309 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
310 .len
= htons(sizeof(pref
) - 4),
311 .prefix
= request_prefixes
[i
].length
313 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
314 ia_pd_len
+= sizeof(hdr_ia_pd
);
315 if (request_prefixes
[i
].length
) {
316 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
317 ia_pd_len
+= sizeof(pref
);
321 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
322 ia_pd_entries
/= sizeof(*e
);
324 // we're too lazy to count our distinct IAIDs,
325 // so just allocate maximally needed space
326 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
327 sizeof(struct dhcpv6_ia_hdr
)));
329 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
330 uint32_t iaid
= e
[i
].iaid
;
332 // check if this is an unprocessed IAID and skip if not.
334 for (int j
= i
-1; j
>= 0; j
--) {
335 if (e
[j
].iaid
== iaid
) {
345 struct dhcpv6_ia_hdr hdr_ia_pd
= {
346 htons(DHCPV6_OPT_IA_PD
),
347 htons(sizeof(hdr_ia_pd
) - 4),
351 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
352 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
353 ia_pd_len
+= sizeof(hdr_ia_pd
);
355 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
356 if (e
[j
].iaid
!= iaid
)
360 if (e
[j
].priority
> 0)
361 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
363 struct dhcpv6_ia_prefix p
= {
364 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
365 .len
= htons(sizeof(p
) - 4U + ex_len
),
366 .prefix
= e
[j
].length
,
370 if (type
== DHCPV6_MSG_REQUEST
) {
371 p
.preferred
= htonl(e
[j
].preferred
);
372 p
.valid
= htonl(e
[j
].valid
);
375 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
376 ia_pd_len
+= sizeof(p
);
379 ia_pd
[ia_pd_len
++] = 0;
380 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
381 ia_pd
[ia_pd_len
++] = 0;
382 ia_pd
[ia_pd_len
++] = ex_len
- 4;
383 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
385 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
386 excl
>>= (64 - e
[j
].priority
);
387 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
389 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
390 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
391 ia_pd_len
+= ex_len
- 5;
394 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
400 size_t ia_na_entries
, ia_na_len
= 0;
402 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
403 ia_na_entries
/= sizeof(*e
);
405 struct dhcpv6_ia_hdr hdr_ia_na
= {
406 htons(DHCPV6_OPT_IA_NA
),
407 htons(sizeof(hdr_ia_na
) - 4),
411 struct dhcpv6_ia_addr pa
[ia_na_entries
];
412 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
413 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
414 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
415 pa
[i
].addr
= e
[i
].target
;
417 if (type
== DHCPV6_MSG_REQUEST
) {
418 pa
[i
].preferred
= htonl(e
[i
].preferred
);
419 pa
[i
].valid
= htonl(e
[i
].valid
);
427 ia_na_len
= sizeof(pa
);
428 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
430 // Reconfigure Accept
434 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
438 void *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
440 // Option Request List
441 size_t oro_entries
, oro_len
= 0;
442 uint16_t *oro
, *s_oro
= odhcp6c_get_state(STATE_ORO
, &oro_entries
);
444 oro_entries
/= sizeof(*s_oro
);
445 oro
= alloca(oro_entries
* sizeof(*oro
));
447 for (size_t i
= 0; i
< oro_entries
; i
++) {
448 struct odhcp6c_opt
*opt
= odhcp6c_find_opt(htons(s_oro
[i
]));
451 if (!(opt
->flags
& OPT_ORO
))
454 if ((opt
->flags
& OPT_ORO_SOLICIT
) && type
!= DHCPV6_MSG_SOLICIT
)
457 if ((opt
->flags
& OPT_ORO_STATELESS
) && type
!= DHCPV6_MSG_INFO_REQ
)
460 if ((opt
->flags
& OPT_ORO_STATEFUL
) && type
== DHCPV6_MSG_INFO_REQ
)
464 oro
[oro_len
++] = s_oro
[i
];
466 oro_len
*= sizeof(*oro
);
472 uint16_t elapsed_type
;
473 uint16_t elapsed_len
;
474 uint16_t elapsed_value
;
478 type
, {trid
[0], trid
[1], trid
[2]},
479 htons(DHCPV6_OPT_ELAPSED
), htons(2),
480 htons((ecs
> 0xffff) ? 0xffff : ecs
),
481 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
484 struct iovec iov
[IOV_TOTAL
] = {
485 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
486 [IOV_ORO
] = {oro
, oro_len
},
487 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
488 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
489 [IOV_OPTS
] = { opts
, opts_len
},
490 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
491 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
492 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
493 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
494 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
497 size_t cnt
= IOV_TOTAL
;
498 if (type
== DHCPV6_MSG_INFO_REQ
)
501 // Disable IAs if not used
502 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
503 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
505 if (na_mode
== IA_MODE_NONE
)
506 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
508 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
509 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
510 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
512 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
513 iov
[IOV_FQDN
].iov_len
= 0;
515 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
516 0, ALL_DHCPV6_RELAYS
, ifindex
};
517 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
518 .msg_iov
= iov
, .msg_iovlen
= cnt
};
521 case DHCPV6_MSG_REQUEST
:
522 case DHCPV6_MSG_RENEW
:
523 case DHCPV6_MSG_RELEASE
:
524 case DHCPV6_MSG_DECLINE
:
525 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr
) &&
526 odhcp6c_addr_in_scope(&server_addr
)) {
527 srv
.sin6_addr
= server_addr
;
528 if (!IN6_IS_ADDR_LINKLOCAL(&server_addr
))
529 srv
.sin6_scope_id
= 0;
536 if (sendmsg(sock
, &msg
, 0) < 0) {
537 char in6_str
[INET6_ADDRSTRLEN
];
539 syslog(LOG_ERR
, "Failed to send DHCPV6 message to %s (%s)",
540 inet_ntop(AF_INET6
, (const void *)&srv
.sin6_addr
,
541 in6_str
, sizeof(in6_str
)), strerror(errno
));
545 static int64_t dhcpv6_rand_delay(int64_t time
)
548 odhcp6c_random(&random
, sizeof(random
));
550 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
553 int dhcpv6_request(enum dhcpv6_msg type
)
556 uint64_t timeout
= UINT32_MAX
;
557 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
560 struct timespec ts
= {0, 0};
561 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
563 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
566 if (type
== DHCPV6_MSG_UNKNOWN
)
568 else if (type
== DHCPV6_MSG_RENEW
)
569 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
570 else if (type
== DHCPV6_MSG_REBIND
)
571 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
576 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %"PRIu64
"s, max rc %d)",
577 retx
->name
, timeout
, retx
->max_rc
);
579 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
581 // Generate transaction ID
582 uint8_t trid
[3] = {0, 0, 0};
583 if (type
!= DHCPV6_MSG_UNKNOWN
)
584 odhcp6c_random(trid
, sizeof(trid
));
591 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
593 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
594 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
595 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
597 rto
= (retx
->init_timeo
* 1000 + delay
);
599 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
601 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
602 rto
= retx
->max_timeo
* 1000 +
603 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
605 // Calculate end for this round and elapsed time
606 uint64_t round_end
= round_start
+ rto
;
607 elapsed
= round_start
- start
;
609 // Don't wait too long if timeout differs from infinite
610 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
611 round_end
= timeout
* 1000 + start
;
613 // Built and send package
615 case DHCPV6_MSG_UNKNOWN
:
618 syslog(LOG_NOTICE
, "Send %s message (elapsed %"PRIu64
"ms, rc %d)",
619 retx
->name
, elapsed
, rc
);
621 case DHCPV6_MSG_SOLICIT
:
622 case DHCPV6_MSG_INFO_REQ
:
623 dhcpv6_send(type
, trid
, elapsed
/ 10);
628 for (; len
< 0 && (round_start
< round_end
);
629 round_start
= odhcp6c_get_milli_time()) {
633 uint8_t buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
635 struct iovec iov
= {buf
, sizeof(buf
)};
636 struct sockaddr_in6 addr
;
637 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
638 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
.buf
,
639 .msg_controllen
= sizeof(cmsg_buf
)};
640 struct in6_pktinfo
*pktinfo
= NULL
;
642 // Check for pending signal
643 if (odhcp6c_signal_process())
646 // Set timeout for receiving
647 uint64_t t
= round_end
- round_start
;
648 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
649 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
650 &tv
, sizeof(tv
)) < 0)
651 syslog(LOG_ERR
, "setsockopt SO_RCVTIMEO failed (%s)",
655 len
= recvmsg(sock
, &msg
, 0);
659 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
660 ch
= CMSG_NXTHDR(&msg
, ch
)) {
661 if (ch
->cmsg_level
== SOL_IPV6
&&
662 ch
->cmsg_type
== IPV6_PKTINFO
) {
663 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
668 if (pktinfo
== NULL
) {
673 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
674 type
, &pktinfo
->ipi6_addr
)) {
679 uint8_t *opt
= &buf
[4];
680 uint8_t *opt_end
= opt
+ len
- 4;
682 round_start
= odhcp6c_get_milli_time();
683 elapsed
= round_start
- start
;
684 syslog(LOG_NOTICE
, "Got a valid reply after %"PRIu64
"ms",
687 if (retx
->handler_reply
)
688 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
690 if (len
> 0 && round_end
- round_start
> 1000)
691 round_end
= 1000 + round_start
;
695 if (retx
->handler_finish
)
696 len
= retx
->handler_finish();
697 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
698 (!retx
->max_rc
|| rc
< retx
->max_rc
));
702 // Message validation checks according to RFC3315 chapter 15
703 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
704 const uint8_t transaction
[3], enum dhcpv6_msg type
,
705 const struct in6_addr
*daddr
)
707 const struct dhcpv6_header
*rep
= buf
;
708 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
709 transaction
, sizeof(rep
->tr_id
)))
710 return false; // Invalid reply
712 if (type
== DHCPV6_MSG_SOLICIT
) {
713 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
714 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
717 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
718 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
721 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
)
724 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
725 rcmsg
= DHCPV6_MSG_UNKNOWN
;
726 uint16_t otype
, olen
= UINT16_MAX
;
727 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
728 ia_present
= false, options_valid
= true;
730 size_t client_id_len
, server_id_len
;
731 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
732 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
734 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
735 if (otype
== DHCPV6_OPT_CLIENTID
) {
736 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
737 &odata
[-4], client_id
, client_id_len
);
738 } else if (otype
== DHCPV6_OPT_SERVERID
) {
740 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
741 &odata
[-4], server_id
, server_id_len
);
744 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
745 sizeof(struct dhcpv6_auth_reconfigure
)) {
746 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
747 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
751 uint8_t serverhash
[16], secretbytes
[64];
753 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
754 memset(r
->key
, 0, sizeof(r
->key
));
756 memset(secretbytes
, 0, sizeof(secretbytes
));
757 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
759 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
760 secretbytes
[i
] ^= 0x36;
763 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
764 md5_hash(buf
, len
, &md5
);
767 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
768 secretbytes
[i
] ^= 0x36;
769 secretbytes
[i
] ^= 0x5c;
773 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
774 md5_hash(hash
, 16, &md5
);
777 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
778 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
780 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
782 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
783 options_valid
= false;
784 } else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
785 (otype
== DHCPV6_OPT_PD_EXCLUDE
))
786 // Options are not allowed on global level
787 options_valid
= false;
790 if (!options_valid
|| ((odata
+ olen
) > end
))
793 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
796 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
797 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_REBIND
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
798 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
799 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
803 return clientid_ok
&& serverid_ok
;
806 int dhcpv6_poll_reconfigure(void)
808 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
811 ret
= dhcpv6_request(ret
);
816 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig
, const int rc
,
817 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
819 uint16_t otype
, olen
;
823 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
824 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
826 case DHCPV6_MSG_REBIND
:
827 if (t2
!= UINT32_MAX
)
830 case DHCPV6_MSG_RENEW
:
831 if (t1
!= UINT32_MAX
)
834 case DHCPV6_MSG_INFO_REQ
:
844 dhcpv6_handle_reply(orig
, rc
, NULL
, NULL
, NULL
);
849 // Collect all advertised servers
850 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
851 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
853 uint16_t olen
, otype
;
854 uint8_t *odata
, pref
= 0;
855 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
856 IN6ADDR_ANY_INIT
, DHCPV6_SOL_MAX_RT
,
857 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
858 bool have_na
= false;
861 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
862 if (orig
== DHCPV6_MSG_SOLICIT
&&
863 ((otype
== DHCPV6_OPT_IA_PD
&& pd_mode
!= IA_MODE_NONE
) ||
864 (otype
== DHCPV6_OPT_IA_NA
&& na_mode
!= IA_MODE_NONE
)) &&
865 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
866 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
867 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
870 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
871 memcpy(cand
.duid
, odata
, olen
);
872 cand
.duid_len
= olen
;
873 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
874 cand
.preference
>= 0) {
875 cand
.preference
= pref
= odata
[0];
876 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(cand
.server_addr
)) {
877 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
878 cand
.server_addr
= *(struct in6_addr
*)odata
;
880 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
881 cand
.wants_reconfigure
= true;
882 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
883 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
884 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
885 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
886 cand
.sol_max_rt
= sol_max_rt
;
888 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
889 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
890 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
891 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
892 cand
.inf_max_rt
= inf_max_rt
;
894 } else if (otype
== DHCPV6_OPT_IA_PD
&&
895 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
896 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
897 uint8_t *oend
= odata
+ olen
, *d
;
898 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
899 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
900 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
901 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
905 } else if (otype
== DHCPV6_OPT_IA_NA
&&
906 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
907 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
908 uint8_t *oend
= odata
+ olen
, *d
;
910 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
911 if (otype
== DHCPV6_OPT_IA_ADDR
&&
912 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
918 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
919 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
921 * RFC7083 states to process the SOL_MAX_RT and
922 * INF_MAX_RT options even if the DHCPv6 server
923 * did not propose any IA_NA and/or IA_PD
925 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
926 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
930 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
931 cand
.has_noaddravail
= true;
932 cand
.preference
-= 1000;
935 if (pd_mode
!= IA_MODE_NONE
) {
937 cand
.preference
+= 2000 + (128 - have_pd
);
939 cand
.preference
-= 2000;
942 if (cand
.duid_len
> 0) {
943 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
944 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
945 dhcpv6_add_server_cand(&cand
);
948 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
951 static int dhcpv6_commit_advert(void)
953 return dhcpv6_promote_server_cand();
956 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
957 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
959 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
960 if (dhcpv6_commit_advert() < 0)
963 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
966 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
967 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
970 uint16_t otype
, olen
;
971 uint32_t refresh
= 86400;
973 unsigned int updated_IAs
= 0;
974 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
978 if (orig
== DHCPV6_MSG_UNKNOWN
) {
979 static time_t last_update
= 0;
980 time_t now
= odhcp6c_get_milli_time() / 1000;
982 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
985 if (t1
!= UINT32_MAX
)
988 if (t2
!= UINT32_MAX
)
991 if (t3
!= UINT32_MAX
)
1004 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
1005 // Delete NA and PD we have in the state from the Advert
1006 odhcp6c_clear_state(STATE_IA_NA
);
1007 odhcp6c_clear_state(STATE_IA_PD
);
1011 odhcp6c_clear_state(STATE_DNS
);
1012 odhcp6c_clear_state(STATE_SEARCH
);
1013 odhcp6c_clear_state(STATE_SNTP_IP
);
1014 odhcp6c_clear_state(STATE_NTP_IP
);
1015 odhcp6c_clear_state(STATE_NTP_FQDN
);
1016 odhcp6c_clear_state(STATE_SIP_IP
);
1017 odhcp6c_clear_state(STATE_SIP_FQDN
);
1018 odhcp6c_clear_state(STATE_AFTR_NAME
);
1019 odhcp6c_clear_state(STATE_CER
);
1020 odhcp6c_clear_state(STATE_S46_MAPT
);
1021 odhcp6c_clear_state(STATE_S46_MAPE
);
1022 odhcp6c_clear_state(STATE_S46_LW
);
1023 odhcp6c_clear_state(STATE_PASSTHRU
);
1024 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
1026 // Parse and find all matching IAs
1027 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
1028 struct odhcp6c_opt
*dopt
= odhcp6c_find_opt(otype
);
1030 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
1031 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
1032 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
1034 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
1035 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
1039 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
1042 uint16_t code
= DHCPV6_Success
;
1043 uint16_t stype
, slen
;
1045 // Get and handle status code
1046 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
1047 stype
, slen
, sdata
) {
1048 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
1049 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
1050 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
1052 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
1054 if (code
== DHCPV6_Success
)
1057 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
1058 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1067 if (code
!= DHCPV6_Success
)
1070 updated_IAs
+= dhcpv6_parse_ia(ia_hdr
, odata
+ olen
);
1071 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(server_addr
)) {
1072 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
1073 server_addr
= *(struct in6_addr
*)odata
;
1076 else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1077 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1078 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1079 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1081 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1082 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1084 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1085 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
)
1086 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1087 else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1089 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1090 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1091 uint16_t stype
, slen
;
1093 // Test status and bail if error
1094 dhcpv6_for_each_option(odata
, odata
+ olen
,
1095 stype
, slen
, sdata
) {
1096 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1097 stype
== NTP_SRV_ADDR
))
1098 odhcp6c_add_state(STATE_NTP_IP
,
1100 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1101 odhcp6c_add_state(STATE_NTP_FQDN
,
1104 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1106 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1107 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
)
1108 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1109 else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1110 refresh
= ntohl_unaligned(odata
);
1111 } else if (otype
== DHCPV6_OPT_AUTH
) {
1112 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1113 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1114 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1115 r
->reconf_type
== 1)
1116 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1118 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1120 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1122 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1123 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1124 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1125 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1126 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1127 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1128 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1129 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1130 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1131 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1132 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1134 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1135 sizeof(struct dhcpv6_cer_id
)) {
1136 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1137 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1138 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1139 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1141 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1142 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1143 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1145 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1147 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1148 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1149 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1151 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1153 if (!dopt
|| !(dopt
->flags
& OPT_NO_PASSTHRU
))
1154 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1159 case DHCPV6_MSG_REQUEST
:
1160 case DHCPV6_MSG_REBIND
:
1161 case DHCPV6_MSG_RENEW
:
1162 // Update refresh timers if no fatal status code was received
1163 if ((ret
> 0) && (ret
= dhcpv6_calc_refresh_timers())) {
1164 if (orig
== DHCPV6_MSG_REQUEST
) {
1165 // All server candidates can be cleared if not yet bound
1166 if (!odhcp6c_is_bound())
1167 dhcpv6_clear_all_server_cand();
1169 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1170 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1171 } else if (orig
== DHCPV6_MSG_RENEW
) {
1172 // Send further renews if T1 is not set and
1177 else if ((t2
- t1
) > 1)
1178 // Grace period of 1 second
1182 } else if (orig
== DHCPV6_MSG_REBIND
) {
1183 // Send further rebinds if T1 and T2 is not set and
1188 else if ((t3
- t2
) > 1)
1189 // Grace period of 1 second
1193 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1194 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1199 case DHCPV6_MSG_INFO_REQ
:
1201 // All server candidates can be cleared if not yet bound
1202 if (!odhcp6c_is_bound())
1203 dhcpv6_clear_all_server_cand();
1216 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
)
1218 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1219 unsigned int updated_IAs
= 0;
1221 uint16_t otype
, olen
;
1224 t1
= ntohl(ia_hdr
->t1
);
1225 t2
= ntohl(ia_hdr
->t2
);
1230 // Update address IA
1231 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1232 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0, 0,
1233 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0};
1235 entry
.iaid
= ia_hdr
->iaid
;
1237 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1238 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1239 if (olen
+ 4U < sizeof(*prefix
))
1242 entry
.valid
= ntohl(prefix
->valid
);
1243 entry
.preferred
= ntohl(prefix
->preferred
);
1245 if (entry
.preferred
> entry
.valid
)
1248 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1249 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1250 if (entry
.t1
> entry
.t2
)
1251 entry
.t1
= entry
.t2
;
1253 entry
.length
= prefix
->prefix
;
1254 entry
.target
= prefix
->addr
;
1255 uint16_t stype
, slen
;
1260 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1261 odata
+ olen
, stype
, slen
, sdata
) {
1262 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1265 uint8_t elen
= sdata
[0];
1269 if (entry
.length
< 32 || elen
<= entry
.length
) {
1274 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1275 if (slen
<= bytes
) {
1280 uint32_t exclude
= 0;
1282 exclude
= exclude
<< 8 | sdata
[bytes
];
1285 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1286 exclude
<<= 64 - elen
;
1288 // Abusing router & priority fields for exclusion
1289 entry
.router
= entry
.target
;
1290 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1291 entry
.priority
= elen
;
1295 if (odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, 0))
1300 memset(&entry
.router
, 0, sizeof(entry
.router
));
1301 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1302 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1303 if (olen
+ 4U < sizeof(*addr
))
1306 entry
.preferred
= ntohl(addr
->preferred
);
1307 entry
.valid
= ntohl(addr
->valid
);
1309 if (entry
.preferred
> entry
.valid
)
1312 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1313 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1314 if (entry
.t1
> entry
.t2
)
1315 entry
.t1
= entry
.t2
;
1318 entry
.target
= addr
->addr
;
1320 if (odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, 0))
1327 static int dhcpv6_calc_refresh_timers(void)
1329 struct odhcp6c_entry
*e
;
1330 size_t ia_na_entries
, ia_pd_entries
, i
;
1331 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1333 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1334 ia_na_entries
/= sizeof(*e
);
1336 for (i
= 0; i
< ia_na_entries
; i
++) {
1343 if (e
[i
].valid
> l_t3
)
1347 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1348 ia_pd_entries
/= sizeof(*e
);
1350 for (i
= 0; i
< ia_pd_entries
; i
++) {
1357 if (e
[i
].valid
> l_t3
)
1361 if (ia_pd_entries
|| ia_na_entries
) {
1367 return (int)(ia_pd_entries
+ ia_na_entries
);
1370 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1371 const void *status_msg
, int len
)
1373 const char *src
= status_msg
;
1380 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1389 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1393 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1394 const uint16_t code
, const void *status_msg
, const int len
,
1397 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1400 case DHCPV6_UnspecFail
:
1405 case DHCPV6_UseMulticast
:
1407 case DHCPV6_MSG_REQUEST
:
1408 case DHCPV6_MSG_RENEW
:
1409 case DHCPV6_MSG_RELEASE
:
1410 case DHCPV6_MSG_DECLINE
:
1411 // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1412 server_addr
= in6addr_any
;
1420 case DHCPV6_NoAddrsAvail
:
1421 case DHCPV6_NoPrefixAvail
:
1422 if (orig
== DHCPV6_MSG_REQUEST
)
1423 *ret
= 0; // Failure
1431 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1432 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1433 const void *status_msg
, const int len
,
1434 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1436 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1437 "IA_NA" : "IA_PD", status_msg
, len
);
1440 case DHCPV6_NoBinding
:
1442 case DHCPV6_MSG_RENEW
:
1443 case DHCPV6_MSG_REBIND
:
1444 if ((*ret
> 0) && !handled_status_codes
[code
])
1445 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1459 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1460 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1463 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1465 // Remove identical duid server candidate
1466 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1467 if (cand
->duid_len
== c
[i
].duid_len
&&
1468 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1471 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1476 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1477 i
< cand_len
/ sizeof(*c
); ++i
) {
1478 if (c
[i
].preference
< cand
->preference
)
1482 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1488 static void dhcpv6_clear_all_server_cand(void)
1491 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1493 // Server candidates need deep delete for IA_NA/IA_PD
1494 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1498 odhcp6c_clear_state(STATE_SERVER_CAND
);
1501 int dhcpv6_promote_server_cand(void)
1504 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1506 int ret
= DHCPV6_STATELESS
;
1508 // Clear lingering candidate state info
1509 odhcp6c_clear_state(STATE_SERVER_ID
);
1510 odhcp6c_clear_state(STATE_IA_NA
);
1511 odhcp6c_clear_state(STATE_IA_PD
);
1516 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1517 na_mode
= IA_MODE_NONE
;
1519 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1520 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1522 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1525 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1526 hdr
[1] = htons(cand
->duid_len
);
1527 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1528 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1529 accept_reconfig
= cand
->wants_reconfigure
;
1531 if (cand
->ia_na_len
) {
1532 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1534 if (na_mode
!= IA_MODE_NONE
)
1535 ret
= DHCPV6_STATEFUL
;
1538 if (cand
->ia_pd_len
) {
1539 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1541 if (pd_mode
!= IA_MODE_NONE
)
1542 ret
= DHCPV6_STATEFUL
;
1545 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1546 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1548 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));