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 unsigned 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 static char *dhcpv6_msg_to_str(enum dhcpv6_msg msg
)
127 static char *dhcpv6_msg_str
[] = {
137 "INFORMATION REQUEST",
140 if (msg
< _DHCPV6_MSG_MAX
)
141 return dhcpv6_msg_str
[msg
];
146 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
148 client_options
= options
;
149 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
151 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
157 memset(&ifr
, 0, sizeof(ifr
));
158 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
) - 1);
159 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
162 ifindex
= ifr
.ifr_ifindex
;
164 // Create client DUID
165 size_t client_id_len
;
166 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
167 if (client_id_len
== 0) {
168 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
169 DHCPV6_DUID_LLADDR
, 0, 1};
171 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
172 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
174 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
175 struct ifreq ifs
[100], *ifp
, *ifend
;
178 ifc
.ifc_len
= sizeof(ifs
);
180 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
181 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
182 // If our interface doesn't have an address...
183 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
184 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
185 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
186 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
187 sizeof(ifr
.ifr_name
));
188 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
191 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
196 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
200 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
202 htons(DHCPV6_OPT_SIP_SERVER_D
),
203 htons(DHCPV6_OPT_SIP_SERVER_A
),
204 htons(DHCPV6_OPT_DNS_SERVERS
),
205 htons(DHCPV6_OPT_DNS_DOMAIN
),
206 htons(DHCPV6_OPT_SNTP_SERVERS
),
207 htons(DHCPV6_OPT_NTP_SERVER
),
208 htons(DHCPV6_OPT_AFTR_NAME
),
209 htons(DHCPV6_OPT_PD_EXCLUDE
),
211 htons(DHCPV6_OPT_CER_ID
),
213 htons(DHCPV6_OPT_S46_CONT_MAPE
),
214 htons(DHCPV6_OPT_S46_CONT_MAPT
),
215 htons(DHCPV6_OPT_S46_CONT_LW
),
217 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
220 uint16_t req_oro
[] = {
221 htons(DHCPV6_OPT_INF_MAX_RT
),
222 htons(DHCPV6_OPT_SOL_MAX_RT
),
223 htons(DHCPV6_OPT_INFO_REFRESH
),
225 odhcp6c_add_state(STATE_ORO
, req_oro
, sizeof(req_oro
));
227 // Configure IPv6-options
229 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
)) < 0)
232 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
)) < 0)
235 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
)) < 0)
238 if (setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
)) < 0)
241 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
242 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
244 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
270 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
272 int mode
= DHCPV6_UNKNOWN
;
277 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
278 mode
= DHCPV6_STATELESS
;
279 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
280 mode
= DHCPV6_STATEFUL
;
285 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
289 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
296 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
297 sizeof(fqdn
.data
), NULL
, NULL
);
298 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
299 fqdn
.len
= htons(fqdn_len
- 4);
304 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
308 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
311 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
314 if (type
== DHCPV6_MSG_SOLICIT
) {
315 odhcp6c_clear_state(STATE_IA_PD
);
317 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
318 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
320 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
322 for (size_t i
= 0; i
< n_prefixes
; i
++) {
323 struct dhcpv6_ia_hdr hdr_ia_pd
= {
324 htons(DHCPV6_OPT_IA_PD
),
325 htons(sizeof(hdr_ia_pd
) - 4 +
326 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
327 request_prefixes
[i
].iaid
, 0, 0
329 struct dhcpv6_ia_prefix pref
= {
330 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
331 .len
= htons(sizeof(pref
) - 4),
332 .prefix
= request_prefixes
[i
].length
334 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
335 ia_pd_len
+= sizeof(hdr_ia_pd
);
336 if (request_prefixes
[i
].length
) {
337 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
338 ia_pd_len
+= sizeof(pref
);
342 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
343 ia_pd_entries
/= sizeof(*e
);
345 // we're too lazy to count our distinct IAIDs,
346 // so just allocate maximally needed space
347 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
348 sizeof(struct dhcpv6_ia_hdr
)));
350 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
351 uint32_t iaid
= e
[i
].iaid
;
353 // check if this is an unprocessed IAID and skip if not.
355 for (int j
= i
-1; j
>= 0; j
--) {
356 if (e
[j
].iaid
== iaid
) {
366 struct dhcpv6_ia_hdr hdr_ia_pd
= {
367 htons(DHCPV6_OPT_IA_PD
),
368 htons(sizeof(hdr_ia_pd
) - 4),
372 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
373 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
374 ia_pd_len
+= sizeof(hdr_ia_pd
);
376 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
377 if (e
[j
].iaid
!= iaid
)
381 if (e
[j
].priority
> 0)
382 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
384 struct dhcpv6_ia_prefix p
= {
385 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
386 .len
= htons(sizeof(p
) - 4U + ex_len
),
387 .prefix
= e
[j
].length
,
391 if (type
== DHCPV6_MSG_REQUEST
) {
392 p
.preferred
= htonl(e
[j
].preferred
);
393 p
.valid
= htonl(e
[j
].valid
);
396 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
397 ia_pd_len
+= sizeof(p
);
400 ia_pd
[ia_pd_len
++] = 0;
401 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
402 ia_pd
[ia_pd_len
++] = 0;
403 ia_pd
[ia_pd_len
++] = ex_len
- 4;
404 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
406 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
407 excl
>>= (64 - e
[j
].priority
);
408 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
410 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
411 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
412 ia_pd_len
+= ex_len
- 5;
415 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
421 size_t ia_na_entries
, ia_na_len
= 0;
423 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
424 ia_na_entries
/= sizeof(*e
);
426 struct dhcpv6_ia_hdr hdr_ia_na
= {
427 htons(DHCPV6_OPT_IA_NA
),
428 htons(sizeof(hdr_ia_na
) - 4),
432 struct dhcpv6_ia_addr pa
[ia_na_entries
];
433 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
434 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
435 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
436 pa
[i
].addr
= e
[i
].target
;
438 if (type
== DHCPV6_MSG_REQUEST
) {
439 pa
[i
].preferred
= htonl(e
[i
].preferred
);
440 pa
[i
].valid
= htonl(e
[i
].valid
);
448 ia_na_len
= sizeof(pa
);
449 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
451 // Reconfigure Accept
455 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
459 void *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
461 // Option Request List
462 size_t oro_entries
, oro_len
= 0;
463 uint16_t *oro
, *s_oro
= odhcp6c_get_state(STATE_ORO
, &oro_entries
);
465 oro_entries
/= sizeof(*s_oro
);
466 oro
= alloca(oro_entries
* sizeof(*oro
));
468 for (size_t i
= 0; i
< oro_entries
; i
++) {
469 struct odhcp6c_opt
*opt
= odhcp6c_find_opt(htons(s_oro
[i
]));
472 if (!(opt
->flags
& OPT_ORO
))
475 if ((opt
->flags
& OPT_ORO_SOLICIT
) && type
!= DHCPV6_MSG_SOLICIT
)
478 if ((opt
->flags
& OPT_ORO_STATELESS
) && type
!= DHCPV6_MSG_INFO_REQ
)
481 if ((opt
->flags
& OPT_ORO_STATEFUL
) && type
== DHCPV6_MSG_INFO_REQ
)
485 oro
[oro_len
++] = s_oro
[i
];
487 oro_len
*= sizeof(*oro
);
493 uint16_t elapsed_type
;
494 uint16_t elapsed_len
;
495 uint16_t elapsed_value
;
499 type
, {trid
[0], trid
[1], trid
[2]},
500 htons(DHCPV6_OPT_ELAPSED
), htons(2),
501 htons((ecs
> 0xffff) ? 0xffff : ecs
),
502 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
505 struct iovec iov
[IOV_TOTAL
] = {
506 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
507 [IOV_ORO
] = {oro
, oro_len
},
508 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
509 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
510 [IOV_OPTS
] = { opts
, opts_len
},
511 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
512 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
513 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
514 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
515 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
518 size_t cnt
= IOV_TOTAL
;
519 if (type
== DHCPV6_MSG_INFO_REQ
)
522 // Disable IAs if not used
523 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
524 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
526 if (na_mode
== IA_MODE_NONE
)
527 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
529 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
530 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
531 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
533 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
534 iov
[IOV_FQDN
].iov_len
= 0;
536 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
537 0, ALL_DHCPV6_RELAYS
, ifindex
};
538 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
539 .msg_iov
= iov
, .msg_iovlen
= cnt
};
542 case DHCPV6_MSG_REQUEST
:
543 case DHCPV6_MSG_RENEW
:
544 case DHCPV6_MSG_RELEASE
:
545 case DHCPV6_MSG_DECLINE
:
546 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr
) &&
547 odhcp6c_addr_in_scope(&server_addr
)) {
548 srv
.sin6_addr
= server_addr
;
549 if (!IN6_IS_ADDR_LINKLOCAL(&server_addr
))
550 srv
.sin6_scope_id
= 0;
557 if (sendmsg(sock
, &msg
, 0) < 0) {
558 char in6_str
[INET6_ADDRSTRLEN
];
560 syslog(LOG_ERR
, "Failed to send %s message to %s (%s)",
561 dhcpv6_msg_to_str(type
),
562 inet_ntop(AF_INET6
, (const void *)&srv
.sin6_addr
,
563 in6_str
, sizeof(in6_str
)), strerror(errno
));
567 static int64_t dhcpv6_rand_delay(int64_t time
)
570 odhcp6c_random(&random
, sizeof(random
));
572 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
575 int dhcpv6_request(enum dhcpv6_msg type
)
578 uint64_t timeout
= UINT32_MAX
;
579 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
582 struct timespec ts
= {0, 0};
583 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
585 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
588 if (type
== DHCPV6_MSG_UNKNOWN
)
590 else if (type
== DHCPV6_MSG_RENEW
)
591 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
592 else if (type
== DHCPV6_MSG_REBIND
)
593 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
598 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %"PRIu64
"s, max rc %d)",
599 retx
->name
, timeout
, retx
->max_rc
);
601 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
603 // Generate transaction ID
604 uint8_t trid
[3] = {0, 0, 0};
605 if (type
!= DHCPV6_MSG_UNKNOWN
)
606 odhcp6c_random(trid
, sizeof(trid
));
613 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
615 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
616 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
617 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
619 rto
= (retx
->init_timeo
* 1000 + delay
);
621 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
623 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
624 rto
= retx
->max_timeo
* 1000 +
625 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
627 // Calculate end for this round and elapsed time
628 uint64_t round_end
= round_start
+ rto
;
629 elapsed
= round_start
- start
;
631 // Don't wait too long if timeout differs from infinite
632 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
633 round_end
= timeout
* 1000 + start
;
635 // Built and send package
637 case DHCPV6_MSG_UNKNOWN
:
640 syslog(LOG_NOTICE
, "Send %s message (elapsed %"PRIu64
"ms, rc %d)",
641 retx
->name
, elapsed
, rc
);
643 case DHCPV6_MSG_SOLICIT
:
644 case DHCPV6_MSG_INFO_REQ
:
645 dhcpv6_send(type
, trid
, elapsed
/ 10);
650 for (; len
< 0 && (round_start
< round_end
);
651 round_start
= odhcp6c_get_milli_time()) {
655 uint8_t buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
657 struct iovec iov
= {buf
, sizeof(buf
)};
658 struct sockaddr_in6 addr
;
659 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
660 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
.buf
,
661 .msg_controllen
= sizeof(cmsg_buf
)};
662 struct in6_pktinfo
*pktinfo
= NULL
;
664 // Check for pending signal
665 if (odhcp6c_signal_process())
668 // Set timeout for receiving
669 uint64_t t
= round_end
- round_start
;
670 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
671 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
672 &tv
, sizeof(tv
)) < 0)
673 syslog(LOG_ERR
, "setsockopt SO_RCVTIMEO failed (%s)",
677 len
= recvmsg(sock
, &msg
, 0);
681 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
682 ch
= CMSG_NXTHDR(&msg
, ch
)) {
683 if (ch
->cmsg_level
== SOL_IPV6
&&
684 ch
->cmsg_type
== IPV6_PKTINFO
) {
685 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
690 if (pktinfo
== NULL
) {
695 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
696 type
, &pktinfo
->ipi6_addr
)) {
701 uint8_t *opt
= &buf
[4];
702 uint8_t *opt_end
= opt
+ len
- 4;
704 round_start
= odhcp6c_get_milli_time();
705 elapsed
= round_start
- start
;
706 syslog(LOG_NOTICE
, "Got a valid reply after %"PRIu64
"ms",
709 if (retx
->handler_reply
)
710 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
712 if (len
> 0 && round_end
- round_start
> 1000)
713 round_end
= 1000 + round_start
;
717 if (retx
->handler_finish
)
718 len
= retx
->handler_finish();
719 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
720 (!retx
->max_rc
|| rc
< retx
->max_rc
));
724 // Message validation checks according to RFC3315 chapter 15
725 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
726 const uint8_t transaction
[3], enum dhcpv6_msg type
,
727 const struct in6_addr
*daddr
)
729 const struct dhcpv6_header
*rep
= buf
;
730 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
731 transaction
, sizeof(rep
->tr_id
)))
732 return false; // Invalid reply
734 if (type
== DHCPV6_MSG_SOLICIT
) {
735 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
736 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
739 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
740 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
743 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
)
746 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
747 rcmsg
= DHCPV6_MSG_UNKNOWN
;
748 uint16_t otype
, olen
= UINT16_MAX
;
749 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
750 ia_present
= false, options_valid
= true;
752 size_t client_id_len
, server_id_len
;
753 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
754 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
756 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
757 if (otype
== DHCPV6_OPT_CLIENTID
) {
758 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
759 &odata
[-4], client_id
, client_id_len
);
760 } else if (otype
== DHCPV6_OPT_SERVERID
) {
762 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
763 &odata
[-4], server_id
, server_id_len
);
766 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
767 sizeof(struct dhcpv6_auth_reconfigure
)) {
768 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
769 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
773 uint8_t serverhash
[16], secretbytes
[64];
775 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
776 memset(r
->key
, 0, sizeof(r
->key
));
778 memset(secretbytes
, 0, sizeof(secretbytes
));
779 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
781 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
782 secretbytes
[i
] ^= 0x36;
785 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
786 md5_hash(buf
, len
, &md5
);
789 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
790 secretbytes
[i
] ^= 0x36;
791 secretbytes
[i
] ^= 0x5c;
795 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
796 md5_hash(hash
, 16, &md5
);
799 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
800 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
802 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
804 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
805 options_valid
= false;
806 } else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
807 (otype
== DHCPV6_OPT_PD_EXCLUDE
))
808 // Options are not allowed on global level
809 options_valid
= false;
812 if (!options_valid
|| ((odata
+ olen
) > end
))
815 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
818 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
819 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_REBIND
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
820 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
821 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
825 return clientid_ok
&& serverid_ok
;
828 int dhcpv6_poll_reconfigure(void)
830 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
833 ret
= dhcpv6_request(ret
);
838 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig
, const int rc
,
839 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
841 uint16_t otype
, olen
;
845 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
846 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
848 case DHCPV6_MSG_REBIND
:
849 if (t2
!= UINT32_MAX
)
852 case DHCPV6_MSG_RENEW
:
853 if (t1
!= UINT32_MAX
)
856 case DHCPV6_MSG_INFO_REQ
:
858 syslog(LOG_NOTICE
, "Got a %s (msg-type %s)",
859 dhcpv6_msg_to_str(otype
),
860 dhcpv6_msg_to_str(msg
));
869 dhcpv6_handle_reply(orig
, rc
, NULL
, NULL
, NULL
);
874 // Collect all advertised servers
875 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
876 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
878 uint16_t olen
, otype
;
879 uint8_t *odata
, pref
= 0;
880 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
881 IN6ADDR_ANY_INIT
, DHCPV6_SOL_MAX_RT
,
882 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
883 bool have_na
= false;
886 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
887 if (orig
== DHCPV6_MSG_SOLICIT
&&
888 ((otype
== DHCPV6_OPT_IA_PD
&& pd_mode
!= IA_MODE_NONE
) ||
889 (otype
== DHCPV6_OPT_IA_NA
&& na_mode
!= IA_MODE_NONE
)) &&
890 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
891 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
892 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
895 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
896 memcpy(cand
.duid
, odata
, olen
);
897 cand
.duid_len
= olen
;
898 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
899 cand
.preference
>= 0) {
900 cand
.preference
= pref
= odata
[0];
901 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(cand
.server_addr
)) {
902 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
903 cand
.server_addr
= *(struct in6_addr
*)odata
;
905 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
906 cand
.wants_reconfigure
= true;
907 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
908 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
909 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
910 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
911 cand
.sol_max_rt
= sol_max_rt
;
913 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
914 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
915 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
916 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
917 cand
.inf_max_rt
= inf_max_rt
;
919 } else if (otype
== DHCPV6_OPT_IA_PD
&&
920 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
921 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
922 uint8_t *oend
= odata
+ olen
, *d
;
923 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
924 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
925 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
926 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
930 } else if (otype
== DHCPV6_OPT_IA_NA
&&
931 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
932 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
933 uint8_t *oend
= odata
+ olen
, *d
;
935 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
936 if (otype
== DHCPV6_OPT_IA_ADDR
&&
937 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
943 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
944 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
946 * RFC7083 states to process the SOL_MAX_RT and
947 * INF_MAX_RT options even if the DHCPv6 server
948 * did not propose any IA_NA and/or IA_PD
950 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
951 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
955 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
956 cand
.has_noaddravail
= true;
957 cand
.preference
-= 1000;
960 if (pd_mode
!= IA_MODE_NONE
) {
962 cand
.preference
+= 2000 + (128 - have_pd
);
964 cand
.preference
-= 2000;
967 if (cand
.duid_len
> 0) {
968 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
969 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
970 dhcpv6_add_server_cand(&cand
);
973 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
976 static int dhcpv6_commit_advert(void)
978 return dhcpv6_promote_server_cand();
981 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
982 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
984 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
985 if (dhcpv6_commit_advert() < 0)
988 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
991 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
992 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
995 uint16_t otype
, olen
;
996 uint32_t refresh
= 86400;
998 unsigned int state_IAs
;
999 unsigned int updated_IAs
= 0;
1000 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
1004 if (orig
== DHCPV6_MSG_UNKNOWN
) {
1005 static time_t last_update
= 0;
1006 time_t now
= odhcp6c_get_milli_time() / 1000;
1008 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
1011 if (t1
!= UINT32_MAX
)
1014 if (t2
!= UINT32_MAX
)
1017 if (t3
!= UINT32_MAX
)
1030 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
1031 // Delete NA and PD we have in the state from the Advert
1032 odhcp6c_clear_state(STATE_IA_NA
);
1033 odhcp6c_clear_state(STATE_IA_PD
);
1037 odhcp6c_clear_state(STATE_DNS
);
1038 odhcp6c_clear_state(STATE_SEARCH
);
1039 odhcp6c_clear_state(STATE_SNTP_IP
);
1040 odhcp6c_clear_state(STATE_NTP_IP
);
1041 odhcp6c_clear_state(STATE_NTP_FQDN
);
1042 odhcp6c_clear_state(STATE_SIP_IP
);
1043 odhcp6c_clear_state(STATE_SIP_FQDN
);
1044 odhcp6c_clear_state(STATE_AFTR_NAME
);
1045 odhcp6c_clear_state(STATE_CER
);
1046 odhcp6c_clear_state(STATE_S46_MAPT
);
1047 odhcp6c_clear_state(STATE_S46_MAPE
);
1048 odhcp6c_clear_state(STATE_S46_LW
);
1049 odhcp6c_clear_state(STATE_PASSTHRU
);
1050 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
1052 // Parse and find all matching IAs
1053 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
1054 struct odhcp6c_opt
*dopt
= odhcp6c_find_opt(otype
);
1056 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
1057 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
1058 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
1060 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
1061 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
1065 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
1068 uint16_t code
= DHCPV6_Success
;
1069 uint16_t stype
, slen
;
1071 // Get and handle status code
1072 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
1073 stype
, slen
, sdata
) {
1074 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
1075 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
1076 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
1078 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
1080 if (code
== DHCPV6_Success
)
1083 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
1084 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1093 if (code
!= DHCPV6_Success
)
1096 updated_IAs
+= dhcpv6_parse_ia(ia_hdr
, odata
+ olen
);
1097 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(server_addr
)) {
1098 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
1099 server_addr
= *(struct in6_addr
*)odata
;
1102 else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1103 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1104 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1105 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1107 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1108 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1110 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1111 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
)
1112 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1113 else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1115 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1116 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1117 uint16_t stype
, slen
;
1119 // Test status and bail if error
1120 dhcpv6_for_each_option(odata
, odata
+ olen
,
1121 stype
, slen
, sdata
) {
1122 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1123 stype
== NTP_SRV_ADDR
))
1124 odhcp6c_add_state(STATE_NTP_IP
,
1126 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1127 odhcp6c_add_state(STATE_NTP_FQDN
,
1130 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1132 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1133 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
)
1134 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1135 else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1136 refresh
= ntohl_unaligned(odata
);
1137 } else if (otype
== DHCPV6_OPT_AUTH
) {
1138 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1139 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1140 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1141 r
->reconf_type
== 1)
1142 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1144 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1146 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1148 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1149 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1150 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1151 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1152 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1153 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1154 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1155 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1156 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1157 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1158 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1160 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1161 sizeof(struct dhcpv6_cer_id
)) {
1162 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1163 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1164 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1165 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1167 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1168 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1169 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1171 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1173 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1174 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1175 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1177 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1179 if (!dopt
|| !(dopt
->flags
& OPT_NO_PASSTHRU
))
1180 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1184 // Bail out if fatal status code was received
1189 case DHCPV6_MSG_REQUEST
:
1190 case DHCPV6_MSG_REBIND
:
1191 case DHCPV6_MSG_RENEW
:
1192 state_IAs
= dhcpv6_calc_refresh_timers();
1193 // In case there're no state IA entries
1194 // keep sending request/renew/rebind messages
1195 if (state_IAs
== 0) {
1200 if (orig
== DHCPV6_MSG_REQUEST
) {
1201 // All server candidates can be cleared if not yet bound
1202 if (!odhcp6c_is_bound())
1203 dhcpv6_clear_all_server_cand();
1205 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1206 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1207 } else if (orig
== DHCPV6_MSG_RENEW
) {
1208 // Send further renews if T1 is not set and if
1209 // there're IAs which were not in the Reply message
1210 if (!t1
&& state_IAs
!= updated_IAs
) {
1213 script_call("updated", 0, false);
1216 * RFC8415 states following in §18.2.10.1 :
1217 * Sends a Renew/Rebind if any of the IAs are not in the Reply
1218 * message, but as this likely indicates that the server that
1219 * responded does not support that IA type, sending immediately is
1220 * unlikely to produce a different result. Therefore, the client
1221 * MUST rate-limit its transmissions (see Section 14.1) and MAY just
1222 * wait for the normal retransmission time (as if the Reply message
1223 * had not been received). The client continues to use other
1224 * bindings for which the server did return information
1228 } else if (orig
== DHCPV6_MSG_REBIND
) {
1229 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1230 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1232 // Send further rebinds if T1 and T2 is not set and if
1233 // there're IAs which were not in the Reply message
1234 if (!t1
&& !t2
&& state_IAs
!= updated_IAs
) {
1237 script_call("updated", 0, false);
1240 * RFC8415 states following in §18.2.10.1 :
1241 * Sends a Renew/Rebind if any of the IAs are not in the Reply
1242 * message, but as this likely indicates that the server that
1243 * responded does not support that IA type, sending immediately is
1244 * unlikely to produce a different result. Therefore, the client
1245 * MUST rate-limit its transmissions (see Section 14.1) and MAY just
1246 * wait for the normal retransmission time (as if the Reply message
1247 * had not been received). The client continues to use other
1248 * bindings for which the server did return information
1255 case DHCPV6_MSG_INFO_REQ
:
1256 // All server candidates can be cleared if not yet bound
1257 if (!odhcp6c_is_bound())
1258 dhcpv6_clear_all_server_cand();
1270 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
)
1272 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1273 unsigned int updated_IAs
= 0;
1275 uint16_t otype
, olen
;
1277 char buf
[INET6_ADDRSTRLEN
];
1279 t1
= ntohl(ia_hdr
->t1
);
1280 t2
= ntohl(ia_hdr
->t2
);
1285 syslog(LOG_INFO
, "IAID %04x T1 %d T2 %d", htonl(ia_hdr
->iaid
), t1
, t2
);
1287 // Update address IA
1288 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1289 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0,
1290 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0, 0};
1292 entry
.iaid
= ia_hdr
->iaid
;
1294 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1295 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1296 if (olen
+ 4U < sizeof(*prefix
))
1299 entry
.valid
= ntohl(prefix
->valid
);
1300 entry
.preferred
= ntohl(prefix
->preferred
);
1302 if (entry
.preferred
> entry
.valid
)
1305 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1306 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1307 if (entry
.t1
> entry
.t2
)
1308 entry
.t1
= entry
.t2
;
1310 entry
.length
= prefix
->prefix
;
1311 entry
.target
= prefix
->addr
;
1312 uint16_t stype
, slen
;
1317 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1318 odata
+ olen
, stype
, slen
, sdata
) {
1319 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1322 uint8_t elen
= sdata
[0];
1326 if (entry
.length
< 32 || elen
<= entry
.length
) {
1331 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1332 if (slen
<= bytes
) {
1337 uint32_t exclude
= 0;
1339 exclude
= exclude
<< 8 | sdata
[bytes
];
1342 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1343 exclude
<<= 64 - elen
;
1345 // Abusing router & priority fields for exclusion
1346 entry
.router
= entry
.target
;
1347 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1348 entry
.priority
= elen
;
1352 if (odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, 0))
1355 syslog(LOG_INFO
, "%s/%d preferred %d valid %d",
1356 inet_ntop(AF_INET6
, &entry
.target
, buf
, sizeof(buf
)),
1357 entry
.length
, entry
.preferred
, entry
.valid
);
1361 memset(&entry
.router
, 0, sizeof(entry
.router
));
1362 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1363 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1364 if (olen
+ 4U < sizeof(*addr
))
1367 entry
.preferred
= ntohl(addr
->preferred
);
1368 entry
.valid
= ntohl(addr
->valid
);
1370 if (entry
.preferred
> entry
.valid
)
1373 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1374 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1375 if (entry
.t1
> entry
.t2
)
1376 entry
.t1
= entry
.t2
;
1379 entry
.target
= addr
->addr
;
1381 if (odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, 0))
1384 syslog(LOG_INFO
, "%s preferred %d valid %d",
1385 inet_ntop(AF_INET6
, &entry
.target
, buf
, sizeof(buf
)),
1386 entry
.preferred
, entry
.valid
);
1393 static unsigned int dhcpv6_calc_refresh_timers(void)
1395 struct odhcp6c_entry
*e
;
1396 size_t ia_na_entries
, ia_pd_entries
, i
;
1397 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1399 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1400 ia_na_entries
/= sizeof(*e
);
1402 for (i
= 0; i
< ia_na_entries
; i
++) {
1409 if (e
[i
].valid
> l_t3
)
1413 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1414 ia_pd_entries
/= sizeof(*e
);
1416 for (i
= 0; i
< ia_pd_entries
; i
++) {
1423 if (e
[i
].valid
> l_t3
)
1427 if (ia_pd_entries
|| ia_na_entries
) {
1432 syslog(LOG_INFO
, "T1 %"PRId64
"s, T2 %"PRId64
"s, T3 %"PRId64
"s", t1
, t2
, t3
);
1435 return (unsigned int)(ia_pd_entries
+ ia_na_entries
);
1438 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1439 const void *status_msg
, int len
)
1441 const char *src
= status_msg
;
1448 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1457 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1461 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1462 const uint16_t code
, const void *status_msg
, const int len
,
1465 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1468 case DHCPV6_UnspecFail
:
1473 case DHCPV6_UseMulticast
:
1475 case DHCPV6_MSG_REQUEST
:
1476 case DHCPV6_MSG_RENEW
:
1477 case DHCPV6_MSG_RELEASE
:
1478 case DHCPV6_MSG_DECLINE
:
1479 // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1480 server_addr
= in6addr_any
;
1488 case DHCPV6_NoAddrsAvail
:
1489 case DHCPV6_NoPrefixAvail
:
1490 if (orig
== DHCPV6_MSG_REQUEST
)
1491 *ret
= 0; // Failure
1499 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1500 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1501 const void *status_msg
, const int len
,
1502 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1504 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1505 "IA_NA" : "IA_PD", status_msg
, len
);
1508 case DHCPV6_NoBinding
:
1510 case DHCPV6_MSG_RENEW
:
1511 case DHCPV6_MSG_REBIND
:
1512 if ((*ret
> 0) && !handled_status_codes
[code
])
1513 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1527 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1528 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1531 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1533 // Remove identical duid server candidate
1534 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1535 if (cand
->duid_len
== c
[i
].duid_len
&&
1536 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1539 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1544 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1545 i
< cand_len
/ sizeof(*c
); ++i
) {
1546 if (c
[i
].preference
< cand
->preference
)
1550 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1556 static void dhcpv6_clear_all_server_cand(void)
1559 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1561 // Server candidates need deep delete for IA_NA/IA_PD
1562 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1566 odhcp6c_clear_state(STATE_SERVER_CAND
);
1569 int dhcpv6_promote_server_cand(void)
1572 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1574 int ret
= DHCPV6_STATELESS
;
1576 // Clear lingering candidate state info
1577 odhcp6c_clear_state(STATE_SERVER_ID
);
1578 odhcp6c_clear_state(STATE_IA_NA
);
1579 odhcp6c_clear_state(STATE_IA_PD
);
1584 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1585 na_mode
= IA_MODE_NONE
;
1587 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1588 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1590 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1593 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1594 hdr
[1] = htons(cand
->duid_len
);
1595 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1596 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1597 accept_reconfig
= cand
->wants_reconfigure
;
1599 if (cand
->ia_na_len
) {
1600 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1602 if (na_mode
!= IA_MODE_NONE
)
1603 ret
= DHCPV6_STATEFUL
;
1606 if (cand
->ia_pd_len
) {
1607 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1609 if (pd_mode
!= IA_MODE_NONE
)
1610 ret
= DHCPV6_STATEFUL
;
1613 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1614 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1616 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));