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_SNTP_SERVERS
),
187 htons(DHCPV6_OPT_NTP_SERVER
),
188 htons(DHCPV6_OPT_AFTR_NAME
),
189 htons(DHCPV6_OPT_PD_EXCLUDE
),
190 htons(DHCPV6_OPT_SOL_MAX_RT
),
191 htons(DHCPV6_OPT_INF_MAX_RT
),
193 htons(DHCPV6_OPT_CER_ID
),
195 htons(DHCPV6_OPT_S46_CONT_MAPE
),
196 htons(DHCPV6_OPT_S46_CONT_MAPT
),
197 htons(DHCPV6_OPT_S46_CONT_LW
),
199 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
202 uint16_t req_oro
[] = {
203 htons(DHCPV6_OPT_INF_MAX_RT
),
204 htons(DHCPV6_OPT_SOL_MAX_RT
),
205 htons(DHCPV6_OPT_INFO_REFRESH
),
207 odhcp6c_add_state(STATE_ORO
, req_oro
, sizeof(req_oro
));
209 // Configure IPv6-options
211 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
)) < 0)
214 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
)) < 0)
217 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
)) < 0)
220 if (setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
)) < 0)
223 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
224 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
226 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
252 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
254 int mode
= DHCPV6_UNKNOWN
;
259 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
260 mode
= DHCPV6_STATELESS
;
261 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
262 mode
= DHCPV6_STATEFUL
;
267 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
271 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
278 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
279 sizeof(fqdn
.data
), NULL
, NULL
);
280 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
281 fqdn
.len
= htons(fqdn_len
- 4);
286 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
290 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
293 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
296 if (type
== DHCPV6_MSG_SOLICIT
) {
297 odhcp6c_clear_state(STATE_IA_PD
);
299 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
300 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
302 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
304 for (size_t i
= 0; i
< n_prefixes
; i
++) {
305 struct dhcpv6_ia_hdr hdr_ia_pd
= {
306 htons(DHCPV6_OPT_IA_PD
),
307 htons(sizeof(hdr_ia_pd
) - 4 +
308 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
309 request_prefixes
[i
].iaid
, 0, 0
311 struct dhcpv6_ia_prefix pref
= {
312 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
313 .len
= htons(sizeof(pref
) - 4),
314 .prefix
= request_prefixes
[i
].length
316 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
317 ia_pd_len
+= sizeof(hdr_ia_pd
);
318 if (request_prefixes
[i
].length
) {
319 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
320 ia_pd_len
+= sizeof(pref
);
324 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
325 ia_pd_entries
/= sizeof(*e
);
327 // we're too lazy to count our distinct IAIDs,
328 // so just allocate maximally needed space
329 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
330 sizeof(struct dhcpv6_ia_hdr
)));
332 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
333 uint32_t iaid
= e
[i
].iaid
;
335 // check if this is an unprocessed IAID and skip if not.
337 for (int j
= i
-1; j
>= 0; j
--) {
338 if (e
[j
].iaid
== iaid
) {
348 struct dhcpv6_ia_hdr hdr_ia_pd
= {
349 htons(DHCPV6_OPT_IA_PD
),
350 htons(sizeof(hdr_ia_pd
) - 4),
354 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
355 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
356 ia_pd_len
+= sizeof(hdr_ia_pd
);
358 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
359 if (e
[j
].iaid
!= iaid
)
363 if (e
[j
].priority
> 0)
364 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
366 struct dhcpv6_ia_prefix p
= {
367 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
368 .len
= htons(sizeof(p
) - 4U + ex_len
),
369 .prefix
= e
[j
].length
,
373 if (type
== DHCPV6_MSG_REQUEST
) {
374 p
.preferred
= htonl(e
[j
].preferred
);
375 p
.valid
= htonl(e
[j
].valid
);
378 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
379 ia_pd_len
+= sizeof(p
);
382 ia_pd
[ia_pd_len
++] = 0;
383 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
384 ia_pd
[ia_pd_len
++] = 0;
385 ia_pd
[ia_pd_len
++] = ex_len
- 4;
386 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
388 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
389 excl
>>= (64 - e
[j
].priority
);
390 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
392 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
393 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
394 ia_pd_len
+= ex_len
- 5;
397 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
402 if (ia_pd_entries
> 0)
406 size_t ia_na_entries
, ia_na_len
= 0;
408 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
409 ia_na_entries
/= sizeof(*e
);
411 struct dhcpv6_ia_hdr hdr_ia_na
= {
412 htons(DHCPV6_OPT_IA_NA
),
413 htons(sizeof(hdr_ia_na
) - 4),
417 struct dhcpv6_ia_addr pa
[ia_na_entries
];
418 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
419 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
420 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
421 pa
[i
].addr
= e
[i
].target
;
423 if (type
== DHCPV6_MSG_REQUEST
) {
424 pa
[i
].preferred
= htonl(e
[i
].preferred
);
425 pa
[i
].valid
= htonl(e
[i
].valid
);
433 ia_na_len
= sizeof(pa
);
434 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
436 // Reconfigure Accept
440 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
444 void *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
446 // Option Request List
447 size_t oro_entries
, oro_len
= 0;
448 uint16_t *oro
, *s_oro
= odhcp6c_get_state(STATE_ORO
, &oro_entries
);
450 oro_entries
/= sizeof(*s_oro
);
451 oro
= alloca(oro_entries
* sizeof(*oro
));
453 for (size_t i
= 0; i
< oro_entries
; i
++) {
454 struct odhcp6c_opt
*opt
= odhcp6c_find_opt(htons(s_oro
[i
]));
457 if (!(opt
->flags
& OPT_ORO
))
460 if ((opt
->flags
& OPT_ORO_SOLICIT
) && type
!= DHCPV6_MSG_SOLICIT
)
463 if ((opt
->flags
& OPT_ORO_STATELESS
) && type
!= DHCPV6_MSG_INFO_REQ
)
466 if ((opt
->flags
& OPT_ORO_STATEFUL
) && type
== DHCPV6_MSG_INFO_REQ
)
470 oro
[oro_len
++] = s_oro
[i
];
472 oro_len
*= sizeof(*oro
);
478 uint16_t elapsed_type
;
479 uint16_t elapsed_len
;
480 uint16_t elapsed_value
;
484 type
, {trid
[0], trid
[1], trid
[2]},
485 htons(DHCPV6_OPT_ELAPSED
), htons(2),
486 htons((ecs
> 0xffff) ? 0xffff : ecs
),
487 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
490 struct iovec iov
[IOV_TOTAL
] = {
491 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
492 [IOV_ORO
] = {oro
, oro_len
},
493 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
494 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
495 [IOV_OPTS
] = { opts
, opts_len
},
496 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
497 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
498 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
499 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
500 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
503 size_t cnt
= IOV_TOTAL
;
504 if (type
== DHCPV6_MSG_INFO_REQ
)
506 else if (!request_prefix
)
509 // Disable IAs if not used
510 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
511 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
513 if (na_mode
== IA_MODE_NONE
)
514 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
516 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
517 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
518 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
520 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
521 iov
[IOV_FQDN
].iov_len
= 0;
523 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
524 0, ALL_DHCPV6_RELAYS
, ifindex
};
525 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
526 .msg_iov
= iov
, .msg_iovlen
= cnt
};
529 case DHCPV6_MSG_REQUEST
:
530 case DHCPV6_MSG_RENEW
:
531 case DHCPV6_MSG_RELEASE
:
532 case DHCPV6_MSG_DECLINE
:
533 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr
) &&
534 odhcp6c_addr_in_scope(&server_addr
)) {
535 srv
.sin6_addr
= server_addr
;
536 if (!IN6_IS_ADDR_LINKLOCAL(&server_addr
))
537 srv
.sin6_scope_id
= 0;
544 if (sendmsg(sock
, &msg
, 0) < 0) {
545 char in6_str
[INET6_ADDRSTRLEN
];
547 syslog(LOG_ERR
, "Failed to send DHCPV6 message to %s (%s)",
548 inet_ntop(AF_INET6
, (const void *)&srv
.sin6_addr
,
549 in6_str
, sizeof(in6_str
)), strerror(errno
));
553 static int64_t dhcpv6_rand_delay(int64_t time
)
556 odhcp6c_random(&random
, sizeof(random
));
558 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
561 int dhcpv6_request(enum dhcpv6_msg type
)
564 uint64_t timeout
= UINT32_MAX
;
565 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
568 struct timespec ts
= {0, 0};
569 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
571 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
574 if (type
== DHCPV6_MSG_UNKNOWN
)
576 else if (type
== DHCPV6_MSG_RENEW
)
577 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
578 else if (type
== DHCPV6_MSG_REBIND
)
579 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
584 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %"PRIu64
"s, max rc %d)",
585 retx
->name
, timeout
, retx
->max_rc
);
587 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
589 // Generate transaction ID
590 uint8_t trid
[3] = {0, 0, 0};
591 if (type
!= DHCPV6_MSG_UNKNOWN
)
592 odhcp6c_random(trid
, sizeof(trid
));
599 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
601 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
602 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
603 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
605 rto
= (retx
->init_timeo
* 1000 + delay
);
607 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
609 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
610 rto
= retx
->max_timeo
* 1000 +
611 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
613 // Calculate end for this round and elapsed time
614 uint64_t round_end
= round_start
+ rto
;
615 elapsed
= round_start
- start
;
617 // Don't wait too long if timeout differs from infinite
618 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
619 round_end
= timeout
* 1000 + start
;
621 // Built and send package
623 case DHCPV6_MSG_UNKNOWN
:
626 syslog(LOG_NOTICE
, "Send %s message (elapsed %"PRIu64
"ms, rc %d)",
627 retx
->name
, elapsed
, rc
);
629 case DHCPV6_MSG_SOLICIT
:
630 case DHCPV6_MSG_INFO_REQ
:
631 dhcpv6_send(type
, trid
, elapsed
/ 10);
636 for (; len
< 0 && (round_start
< round_end
);
637 round_start
= odhcp6c_get_milli_time()) {
641 uint8_t buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
643 struct iovec iov
= {buf
, sizeof(buf
)};
644 struct sockaddr_in6 addr
;
645 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
646 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
.buf
,
647 .msg_controllen
= sizeof(cmsg_buf
)};
648 struct in6_pktinfo
*pktinfo
= NULL
;
650 // Check for pending signal
651 if (odhcp6c_signal_process())
654 // Set timeout for receiving
655 uint64_t t
= round_end
- round_start
;
656 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
657 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
658 &tv
, sizeof(tv
)) < 0)
659 syslog(LOG_ERR
, "setsockopt SO_RCVTIMEO failed (%s)",
663 len
= recvmsg(sock
, &msg
, 0);
667 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
668 ch
= CMSG_NXTHDR(&msg
, ch
)) {
669 if (ch
->cmsg_level
== SOL_IPV6
&&
670 ch
->cmsg_type
== IPV6_PKTINFO
) {
671 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
676 if (pktinfo
== NULL
) {
681 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
682 type
, &pktinfo
->ipi6_addr
)) {
687 uint8_t *opt
= &buf
[4];
688 uint8_t *opt_end
= opt
+ len
- 4;
690 round_start
= odhcp6c_get_milli_time();
691 elapsed
= round_start
- start
;
692 syslog(LOG_NOTICE
, "Got a valid reply after %"PRIu64
"ms",
695 if (retx
->handler_reply
)
696 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
698 if (len
> 0 && round_end
- round_start
> 1000)
699 round_end
= 1000 + round_start
;
703 if (retx
->handler_finish
)
704 len
= retx
->handler_finish();
705 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
706 (!retx
->max_rc
|| rc
< retx
->max_rc
));
710 // Message validation checks according to RFC3315 chapter 15
711 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
712 const uint8_t transaction
[3], enum dhcpv6_msg type
,
713 const struct in6_addr
*daddr
)
715 const struct dhcpv6_header
*rep
= buf
;
716 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
717 transaction
, sizeof(rep
->tr_id
)))
718 return false; // Invalid reply
720 if (type
== DHCPV6_MSG_SOLICIT
) {
721 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
722 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
725 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
726 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
729 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
)
732 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
733 rcmsg
= DHCPV6_MSG_UNKNOWN
;
734 uint16_t otype
, olen
= UINT16_MAX
;
735 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
736 ia_present
= false, options_valid
= true;
738 size_t client_id_len
, server_id_len
;
739 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
740 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
742 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
743 if (otype
== DHCPV6_OPT_CLIENTID
) {
744 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
745 &odata
[-4], client_id
, client_id_len
);
746 } else if (otype
== DHCPV6_OPT_SERVERID
) {
748 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
749 &odata
[-4], server_id
, server_id_len
);
752 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
753 sizeof(struct dhcpv6_auth_reconfigure
)) {
754 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
755 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
759 uint8_t serverhash
[16], secretbytes
[64];
761 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
762 memset(r
->key
, 0, sizeof(r
->key
));
764 memset(secretbytes
, 0, sizeof(secretbytes
));
765 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
767 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
768 secretbytes
[i
] ^= 0x36;
771 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
772 md5_hash(buf
, len
, &md5
);
775 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
776 secretbytes
[i
] ^= 0x36;
777 secretbytes
[i
] ^= 0x5c;
781 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
782 md5_hash(hash
, 16, &md5
);
785 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
786 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
788 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
790 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
791 options_valid
= false;
792 } else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
793 (otype
== DHCPV6_OPT_PD_EXCLUDE
))
794 // Options are not allowed on global level
795 options_valid
= false;
798 if (!options_valid
|| ((odata
+ olen
) > end
))
801 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
804 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
805 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_REBIND
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
806 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
807 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
811 return clientid_ok
&& serverid_ok
;
814 int dhcpv6_poll_reconfigure(void)
816 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
819 ret
= dhcpv6_request(ret
);
824 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig
, const int rc
,
825 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
827 uint16_t otype
, olen
;
831 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
832 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
834 case DHCPV6_MSG_REBIND
:
835 if (t2
!= UINT32_MAX
)
838 case DHCPV6_MSG_RENEW
:
839 if (t1
!= UINT32_MAX
)
842 case DHCPV6_MSG_INFO_REQ
:
852 dhcpv6_handle_reply(orig
, rc
, NULL
, NULL
, NULL
);
857 // Collect all advertised servers
858 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
859 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
861 uint16_t olen
, otype
;
862 uint8_t *odata
, pref
= 0;
863 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
864 IN6ADDR_ANY_INIT
, DHCPV6_SOL_MAX_RT
,
865 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
866 bool have_na
= false;
869 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
870 if (orig
== DHCPV6_MSG_SOLICIT
&&
871 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
872 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
873 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
874 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
877 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
878 memcpy(cand
.duid
, odata
, olen
);
879 cand
.duid_len
= olen
;
880 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
881 cand
.preference
>= 0) {
882 cand
.preference
= pref
= odata
[0];
883 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(cand
.server_addr
)) {
884 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
885 cand
.server_addr
= *(struct in6_addr
*)odata
;
887 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
888 cand
.wants_reconfigure
= true;
889 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
890 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
891 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
892 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
893 cand
.sol_max_rt
= sol_max_rt
;
895 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
896 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
897 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
898 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
899 cand
.inf_max_rt
= inf_max_rt
;
901 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
&&
902 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
903 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
904 uint8_t *oend
= odata
+ olen
, *d
;
905 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
906 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
907 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
908 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
912 } else if (otype
== DHCPV6_OPT_IA_NA
&&
913 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
914 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
915 uint8_t *oend
= odata
+ olen
, *d
;
917 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
918 if (otype
== DHCPV6_OPT_IA_ADDR
&&
919 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
925 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
926 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
928 * RFC7083 states to process the SOL_MAX_RT and
929 * INF_MAX_RT options even if the DHCPv6 server
930 * did not propose any IA_NA and/or IA_PD
932 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
933 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
937 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
938 cand
.has_noaddravail
= true;
939 cand
.preference
-= 1000;
942 if (pd_mode
!= IA_MODE_NONE
) {
944 cand
.preference
+= 2000 + (128 - have_pd
);
946 cand
.preference
-= 2000;
949 if (cand
.duid_len
> 0) {
950 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
951 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
952 dhcpv6_add_server_cand(&cand
);
955 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
958 static int dhcpv6_commit_advert(void)
960 return dhcpv6_promote_server_cand();
963 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
964 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
966 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
967 if (dhcpv6_commit_advert() < 0)
970 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
973 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
974 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
977 uint16_t otype
, olen
;
978 uint32_t refresh
= 86400;
980 unsigned int updated_IAs
= 0;
981 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
985 if (orig
== DHCPV6_MSG_UNKNOWN
) {
986 static time_t last_update
= 0;
987 time_t now
= odhcp6c_get_milli_time() / 1000;
989 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
992 if (t1
!= UINT32_MAX
)
995 if (t2
!= UINT32_MAX
)
998 if (t3
!= UINT32_MAX
)
1011 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
1012 // Delete NA and PD we have in the state from the Advert
1013 odhcp6c_clear_state(STATE_IA_NA
);
1014 odhcp6c_clear_state(STATE_IA_PD
);
1018 odhcp6c_clear_state(STATE_DNS
);
1019 odhcp6c_clear_state(STATE_SEARCH
);
1020 odhcp6c_clear_state(STATE_SNTP_IP
);
1021 odhcp6c_clear_state(STATE_NTP_IP
);
1022 odhcp6c_clear_state(STATE_NTP_FQDN
);
1023 odhcp6c_clear_state(STATE_SIP_IP
);
1024 odhcp6c_clear_state(STATE_SIP_FQDN
);
1025 odhcp6c_clear_state(STATE_AFTR_NAME
);
1026 odhcp6c_clear_state(STATE_CER
);
1027 odhcp6c_clear_state(STATE_S46_MAPT
);
1028 odhcp6c_clear_state(STATE_S46_MAPE
);
1029 odhcp6c_clear_state(STATE_S46_LW
);
1030 odhcp6c_clear_state(STATE_PASSTHRU
);
1031 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
1033 // Parse and find all matching IAs
1034 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
1035 struct odhcp6c_opt
*dopt
= odhcp6c_find_opt(otype
);
1037 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
1038 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
1039 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
1041 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
1042 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
1046 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
1049 uint16_t code
= DHCPV6_Success
;
1050 uint16_t stype
, slen
;
1052 // Get and handle status code
1053 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
1054 stype
, slen
, sdata
) {
1055 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
1056 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
1057 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
1059 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
1061 if (code
== DHCPV6_Success
)
1064 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
1065 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1074 if (code
!= DHCPV6_Success
)
1077 updated_IAs
+= dhcpv6_parse_ia(ia_hdr
, odata
+ olen
);
1078 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(server_addr
)) {
1079 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
1080 server_addr
= *(struct in6_addr
*)odata
;
1083 else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1084 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1085 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1086 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1088 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1089 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1091 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1092 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
)
1093 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1094 else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1096 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1097 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1098 uint16_t stype
, slen
;
1100 // Test status and bail if error
1101 dhcpv6_for_each_option(odata
, odata
+ olen
,
1102 stype
, slen
, sdata
) {
1103 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1104 stype
== NTP_SRV_ADDR
))
1105 odhcp6c_add_state(STATE_NTP_IP
,
1107 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1108 odhcp6c_add_state(STATE_NTP_FQDN
,
1111 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1113 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1114 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
)
1115 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1116 else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1117 refresh
= ntohl_unaligned(odata
);
1118 } else if (otype
== DHCPV6_OPT_AUTH
) {
1119 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1120 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1121 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1122 r
->reconf_type
== 1)
1123 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1125 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1127 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1129 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1130 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1131 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1132 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1133 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1134 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1135 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1136 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1137 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1138 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1139 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1141 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1142 sizeof(struct dhcpv6_cer_id
)) {
1143 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1144 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1145 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1146 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1148 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1149 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1150 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1152 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1154 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1155 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1156 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1158 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1160 if (!dopt
|| !(dopt
->flags
& OPT_NO_PASSTHRU
))
1161 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1166 case DHCPV6_MSG_REQUEST
:
1167 case DHCPV6_MSG_REBIND
:
1168 case DHCPV6_MSG_RENEW
:
1169 // Update refresh timers if no fatal status code was received
1170 if ((ret
> 0) && (ret
= dhcpv6_calc_refresh_timers())) {
1171 if (orig
== DHCPV6_MSG_REQUEST
) {
1172 // All server candidates can be cleared if not yet bound
1173 if (!odhcp6c_is_bound())
1174 dhcpv6_clear_all_server_cand();
1176 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1177 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1178 } else if (orig
== DHCPV6_MSG_RENEW
) {
1179 // Send further renews if T1 is not set and
1184 else if ((t2
- t1
) > 1)
1185 // Grace period of 1 second
1189 } else if (orig
== DHCPV6_MSG_REBIND
) {
1190 // Send further rebinds if T1 and T2 is not set and
1195 else if ((t3
- t2
) > 1)
1196 // Grace period of 1 second
1200 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1201 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1206 case DHCPV6_MSG_INFO_REQ
:
1208 // All server candidates can be cleared if not yet bound
1209 if (!odhcp6c_is_bound())
1210 dhcpv6_clear_all_server_cand();
1223 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
)
1225 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1226 unsigned int updated_IAs
= 0;
1228 uint16_t otype
, olen
;
1231 t1
= ntohl(ia_hdr
->t1
);
1232 t2
= ntohl(ia_hdr
->t2
);
1237 // Update address IA
1238 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1239 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0, 0,
1240 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0};
1242 entry
.iaid
= ia_hdr
->iaid
;
1244 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1245 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1246 if (olen
+ 4U < sizeof(*prefix
))
1249 entry
.valid
= ntohl(prefix
->valid
);
1250 entry
.preferred
= ntohl(prefix
->preferred
);
1252 if (entry
.preferred
> entry
.valid
)
1255 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1256 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1257 if (entry
.t1
> entry
.t2
)
1258 entry
.t1
= entry
.t2
;
1260 entry
.length
= prefix
->prefix
;
1261 entry
.target
= prefix
->addr
;
1262 uint16_t stype
, slen
;
1267 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1268 odata
+ olen
, stype
, slen
, sdata
) {
1269 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1272 uint8_t elen
= sdata
[0];
1276 if (entry
.length
< 32 || elen
<= entry
.length
) {
1281 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1282 if (slen
<= bytes
) {
1287 uint32_t exclude
= 0;
1289 exclude
= exclude
<< 8 | sdata
[bytes
];
1292 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1293 exclude
<<= 64 - elen
;
1295 // Abusing router & priority fields for exclusion
1296 entry
.router
= entry
.target
;
1297 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1298 entry
.priority
= elen
;
1302 if (odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, 0))
1307 memset(&entry
.router
, 0, sizeof(entry
.router
));
1308 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1309 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1310 if (olen
+ 4U < sizeof(*addr
))
1313 entry
.preferred
= ntohl(addr
->preferred
);
1314 entry
.valid
= ntohl(addr
->valid
);
1316 if (entry
.preferred
> entry
.valid
)
1319 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1320 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1321 if (entry
.t1
> entry
.t2
)
1322 entry
.t1
= entry
.t2
;
1325 entry
.target
= addr
->addr
;
1327 if (odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, 0))
1334 static int dhcpv6_calc_refresh_timers(void)
1336 struct odhcp6c_entry
*e
;
1337 size_t ia_na_entries
, ia_pd_entries
, i
;
1338 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1340 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1341 ia_na_entries
/= sizeof(*e
);
1343 for (i
= 0; i
< ia_na_entries
; i
++) {
1350 if (e
[i
].valid
> l_t3
)
1354 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1355 ia_pd_entries
/= sizeof(*e
);
1357 for (i
= 0; i
< ia_pd_entries
; i
++) {
1364 if (e
[i
].valid
> l_t3
)
1368 if (ia_pd_entries
|| ia_na_entries
) {
1374 return (int)(ia_pd_entries
+ ia_na_entries
);
1377 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1378 const void *status_msg
, int len
)
1380 const char *src
= status_msg
;
1387 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1396 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1400 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1401 const uint16_t code
, const void *status_msg
, const int len
,
1404 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1407 case DHCPV6_UnspecFail
:
1412 case DHCPV6_UseMulticast
:
1414 case DHCPV6_MSG_REQUEST
:
1415 case DHCPV6_MSG_RENEW
:
1416 case DHCPV6_MSG_RELEASE
:
1417 case DHCPV6_MSG_DECLINE
:
1418 // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1419 server_addr
= in6addr_any
;
1427 case DHCPV6_NoAddrsAvail
:
1428 case DHCPV6_NoPrefixAvail
:
1429 if (orig
== DHCPV6_MSG_REQUEST
)
1430 *ret
= 0; // Failure
1438 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1439 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1440 const void *status_msg
, const int len
,
1441 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1443 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1444 "IA_NA" : "IA_PD", status_msg
, len
);
1447 case DHCPV6_NoBinding
:
1449 case DHCPV6_MSG_RENEW
:
1450 case DHCPV6_MSG_REBIND
:
1451 if ((*ret
> 0) && !handled_status_codes
[code
])
1452 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1466 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1467 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1470 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1472 // Remove identical duid server candidate
1473 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1474 if (cand
->duid_len
== c
[i
].duid_len
&&
1475 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1478 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1483 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1484 i
< cand_len
/ sizeof(*c
); ++i
) {
1485 if (c
[i
].preference
< cand
->preference
)
1489 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1495 static void dhcpv6_clear_all_server_cand(void)
1498 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1500 // Server candidates need deep delete for IA_NA/IA_PD
1501 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1505 odhcp6c_clear_state(STATE_SERVER_CAND
);
1508 int dhcpv6_promote_server_cand(void)
1511 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1513 int ret
= DHCPV6_STATELESS
;
1515 // Clear lingering candidate state info
1516 odhcp6c_clear_state(STATE_SERVER_ID
);
1517 odhcp6c_clear_state(STATE_IA_NA
);
1518 odhcp6c_clear_state(STATE_IA_PD
);
1523 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1524 na_mode
= IA_MODE_NONE
;
1526 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1527 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1529 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1532 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1533 hdr
[1] = htons(cand
->duid_len
);
1534 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1535 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1536 accept_reconfig
= cand
->wants_reconfigure
;
1538 if (cand
->ia_na_len
) {
1539 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1541 if (na_mode
!= IA_MODE_NONE
)
1542 ret
= DHCPV6_STATEFUL
;
1545 if (cand
->ia_pd_len
) {
1546 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1549 ret
= DHCPV6_STATEFUL
;
1552 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1553 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1555 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));