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
)
128 case DHCPV6_MSG_SOLICIT
:
131 case DHCPV6_MSG_ADVERT
:
134 case DHCPV6_MSG_REQUEST
:
137 case DHCPV6_MSG_RENEW
:
140 case DHCPV6_MSG_REBIND
:
143 case DHCPV6_MSG_REPLY
:
146 case DHCPV6_MSG_RELEASE
:
149 case DHCPV6_MSG_DECLINE
:
152 case DHCPV6_MSG_RECONF
:
153 return "RECONFIGURE";
155 case DHCPV6_MSG_INFO_REQ
:
156 return "INFORMATION REQUEST";
165 static char *dhcpv6_status_code_to_str(uint16_t code
)
171 case DHCPV6_UnspecFail
:
172 return "Unspecified Failure";
174 case DHCPV6_NoAddrsAvail
:
175 return "No Address Available";
177 case DHCPV6_NoBinding
:
180 case DHCPV6_NotOnLink
:
181 return "Not On Link";
183 case DHCPV6_UseMulticast
:
184 return "Use Multicast";
186 case DHCPV6_NoPrefixAvail
:
187 return "No Prefix Available";
196 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
198 client_options
= options
;
199 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
201 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
207 memset(&ifr
, 0, sizeof(ifr
));
208 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
) - 1);
209 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
212 ifindex
= ifr
.ifr_ifindex
;
214 // Create client DUID
215 size_t client_id_len
;
216 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
217 if (client_id_len
== 0) {
218 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
219 DHCPV6_DUID_LLADDR
, 0, 1};
221 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
222 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
224 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
225 struct ifreq ifs
[100], *ifp
, *ifend
;
228 ifc
.ifc_len
= sizeof(ifs
);
230 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
231 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
232 // If our interface doesn't have an address...
233 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
234 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
235 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
236 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
237 sizeof(ifr
.ifr_name
));
238 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
241 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
246 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
250 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
252 htons(DHCPV6_OPT_SIP_SERVER_D
),
253 htons(DHCPV6_OPT_SIP_SERVER_A
),
254 htons(DHCPV6_OPT_DNS_SERVERS
),
255 htons(DHCPV6_OPT_DNS_DOMAIN
),
256 htons(DHCPV6_OPT_SNTP_SERVERS
),
257 htons(DHCPV6_OPT_NTP_SERVER
),
258 htons(DHCPV6_OPT_AFTR_NAME
),
259 htons(DHCPV6_OPT_PD_EXCLUDE
),
261 htons(DHCPV6_OPT_CER_ID
),
263 htons(DHCPV6_OPT_S46_CONT_MAPE
),
264 htons(DHCPV6_OPT_S46_CONT_MAPT
),
265 htons(DHCPV6_OPT_S46_CONT_LW
),
267 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
270 uint16_t req_oro
[] = {
271 htons(DHCPV6_OPT_INF_MAX_RT
),
272 htons(DHCPV6_OPT_SOL_MAX_RT
),
273 htons(DHCPV6_OPT_INFO_REFRESH
),
275 odhcp6c_add_state(STATE_ORO
, req_oro
, sizeof(req_oro
));
277 // Configure IPv6-options
279 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
)) < 0)
282 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
)) < 0)
285 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
)) < 0)
288 if (setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
)) < 0)
291 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
292 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
294 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
320 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
322 int mode
= DHCPV6_UNKNOWN
;
327 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
328 mode
= DHCPV6_STATELESS
;
329 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
330 mode
= DHCPV6_STATEFUL
;
335 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
339 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
346 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
347 sizeof(fqdn
.data
), NULL
, NULL
);
348 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
349 fqdn
.len
= htons(fqdn_len
- 4);
354 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
358 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
361 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
364 if (type
== DHCPV6_MSG_SOLICIT
) {
365 odhcp6c_clear_state(STATE_IA_PD
);
367 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
368 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
370 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
372 for (size_t i
= 0; i
< n_prefixes
; i
++) {
373 struct dhcpv6_ia_hdr hdr_ia_pd
= {
374 htons(DHCPV6_OPT_IA_PD
),
375 htons(sizeof(hdr_ia_pd
) - 4 +
376 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
377 request_prefixes
[i
].iaid
, 0, 0
379 struct dhcpv6_ia_prefix pref
= {
380 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
381 .len
= htons(sizeof(pref
) - 4),
382 .prefix
= request_prefixes
[i
].length
384 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
385 ia_pd_len
+= sizeof(hdr_ia_pd
);
386 if (request_prefixes
[i
].length
) {
387 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
388 ia_pd_len
+= sizeof(pref
);
392 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
393 ia_pd_entries
/= sizeof(*e
);
395 // we're too lazy to count our distinct IAIDs,
396 // so just allocate maximally needed space
397 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
398 sizeof(struct dhcpv6_ia_hdr
)));
400 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
401 uint32_t iaid
= e
[i
].iaid
;
403 // check if this is an unprocessed IAID and skip if not.
405 for (int j
= i
-1; j
>= 0; j
--) {
406 if (e
[j
].iaid
== iaid
) {
416 struct dhcpv6_ia_hdr hdr_ia_pd
= {
417 htons(DHCPV6_OPT_IA_PD
),
418 htons(sizeof(hdr_ia_pd
) - 4),
422 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
423 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
424 ia_pd_len
+= sizeof(hdr_ia_pd
);
426 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
427 if (e
[j
].iaid
!= iaid
)
431 if (e
[j
].priority
> 0)
432 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
434 struct dhcpv6_ia_prefix p
= {
435 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
436 .len
= htons(sizeof(p
) - 4U + ex_len
),
437 .prefix
= e
[j
].length
,
441 if (type
== DHCPV6_MSG_REQUEST
) {
442 p
.preferred
= htonl(e
[j
].preferred
);
443 p
.valid
= htonl(e
[j
].valid
);
446 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
447 ia_pd_len
+= sizeof(p
);
450 ia_pd
[ia_pd_len
++] = 0;
451 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
452 ia_pd
[ia_pd_len
++] = 0;
453 ia_pd
[ia_pd_len
++] = ex_len
- 4;
454 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
456 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
457 excl
>>= (64 - e
[j
].priority
);
458 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
460 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
461 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
462 ia_pd_len
+= ex_len
- 5;
465 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
471 size_t ia_na_entries
, ia_na_len
= 0;
473 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
474 ia_na_entries
/= sizeof(*e
);
476 struct dhcpv6_ia_hdr hdr_ia_na
= {
477 htons(DHCPV6_OPT_IA_NA
),
478 htons(sizeof(hdr_ia_na
) - 4),
482 struct dhcpv6_ia_addr pa
[ia_na_entries
];
483 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
484 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
485 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
486 pa
[i
].addr
= e
[i
].target
;
488 if (type
== DHCPV6_MSG_REQUEST
) {
489 pa
[i
].preferred
= htonl(e
[i
].preferred
);
490 pa
[i
].valid
= htonl(e
[i
].valid
);
498 ia_na_len
= sizeof(pa
);
499 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
501 // Reconfigure Accept
505 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
509 void *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
511 // Option Request List
512 size_t oro_entries
, oro_len
= 0;
513 uint16_t *oro
, *s_oro
= odhcp6c_get_state(STATE_ORO
, &oro_entries
);
515 oro_entries
/= sizeof(*s_oro
);
516 oro
= alloca(oro_entries
* sizeof(*oro
));
518 for (size_t i
= 0; i
< oro_entries
; i
++) {
519 struct odhcp6c_opt
*opt
= odhcp6c_find_opt(htons(s_oro
[i
]));
522 if (!(opt
->flags
& OPT_ORO
))
525 if ((opt
->flags
& OPT_ORO_SOLICIT
) && type
!= DHCPV6_MSG_SOLICIT
)
528 if ((opt
->flags
& OPT_ORO_STATELESS
) && type
!= DHCPV6_MSG_INFO_REQ
)
531 if ((opt
->flags
& OPT_ORO_STATEFUL
) && type
== DHCPV6_MSG_INFO_REQ
)
535 oro
[oro_len
++] = s_oro
[i
];
537 oro_len
*= sizeof(*oro
);
543 uint16_t elapsed_type
;
544 uint16_t elapsed_len
;
545 uint16_t elapsed_value
;
549 type
, {trid
[0], trid
[1], trid
[2]},
550 htons(DHCPV6_OPT_ELAPSED
), htons(2),
551 htons((ecs
> 0xffff) ? 0xffff : ecs
),
552 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
555 struct iovec iov
[IOV_TOTAL
] = {
556 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
557 [IOV_ORO
] = {oro
, oro_len
},
558 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
559 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
560 [IOV_OPTS
] = { opts
, opts_len
},
561 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
562 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
563 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
564 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
565 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
568 size_t cnt
= IOV_TOTAL
;
569 if (type
== DHCPV6_MSG_INFO_REQ
)
572 // Disable IAs if not used
573 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
574 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
576 if (na_mode
== IA_MODE_NONE
)
577 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
579 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
580 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
581 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
583 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
584 iov
[IOV_FQDN
].iov_len
= 0;
586 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
587 0, ALL_DHCPV6_RELAYS
, ifindex
};
588 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
589 .msg_iov
= iov
, .msg_iovlen
= cnt
};
592 case DHCPV6_MSG_REQUEST
:
593 case DHCPV6_MSG_RENEW
:
594 case DHCPV6_MSG_RELEASE
:
595 case DHCPV6_MSG_DECLINE
:
596 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr
) &&
597 odhcp6c_addr_in_scope(&server_addr
)) {
598 srv
.sin6_addr
= server_addr
;
599 if (!IN6_IS_ADDR_LINKLOCAL(&server_addr
))
600 srv
.sin6_scope_id
= 0;
607 if (sendmsg(sock
, &msg
, 0) < 0) {
608 char in6_str
[INET6_ADDRSTRLEN
];
610 syslog(LOG_ERR
, "Failed to send %s message to %s (%s)",
611 dhcpv6_msg_to_str(type
),
612 inet_ntop(AF_INET6
, (const void *)&srv
.sin6_addr
,
613 in6_str
, sizeof(in6_str
)), strerror(errno
));
617 static int64_t dhcpv6_rand_delay(int64_t time
)
620 odhcp6c_random(&random
, sizeof(random
));
622 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
625 int dhcpv6_request(enum dhcpv6_msg type
)
628 uint64_t timeout
= UINT32_MAX
;
629 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
632 struct timespec ts
= {0, 0};
633 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
635 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
638 if (type
== DHCPV6_MSG_UNKNOWN
)
640 else if (type
== DHCPV6_MSG_RENEW
)
641 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
642 else if (type
== DHCPV6_MSG_REBIND
)
643 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
648 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %"PRIu64
"s, max rc %d)",
649 retx
->name
, timeout
, retx
->max_rc
);
651 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
653 // Generate transaction ID
654 uint8_t trid
[3] = {0, 0, 0};
655 if (type
!= DHCPV6_MSG_UNKNOWN
)
656 odhcp6c_random(trid
, sizeof(trid
));
663 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
665 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
666 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
667 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
669 rto
= (retx
->init_timeo
* 1000 + delay
);
671 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
673 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
674 rto
= retx
->max_timeo
* 1000 +
675 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
677 // Calculate end for this round and elapsed time
678 uint64_t round_end
= round_start
+ rto
;
679 elapsed
= round_start
- start
;
681 // Don't wait too long if timeout differs from infinite
682 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
683 round_end
= timeout
* 1000 + start
;
685 // Built and send package
687 case DHCPV6_MSG_UNKNOWN
:
690 syslog(LOG_NOTICE
, "Send %s message (elapsed %"PRIu64
"ms, rc %d)",
691 retx
->name
, elapsed
, rc
);
693 case DHCPV6_MSG_SOLICIT
:
694 case DHCPV6_MSG_INFO_REQ
:
695 dhcpv6_send(type
, trid
, elapsed
/ 10);
700 for (; len
< 0 && (round_start
< round_end
);
701 round_start
= odhcp6c_get_milli_time()) {
705 uint8_t buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
707 struct iovec iov
= {buf
, sizeof(buf
)};
708 struct sockaddr_in6 addr
;
709 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
710 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
.buf
,
711 .msg_controllen
= sizeof(cmsg_buf
)};
712 struct in6_pktinfo
*pktinfo
= NULL
;
713 const struct dhcpv6_header
*hdr
= (const struct dhcpv6_header
*)buf
;
715 // Check for pending signal
716 if (odhcp6c_signal_process())
719 // Set timeout for receiving
720 uint64_t t
= round_end
- round_start
;
721 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
722 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
723 &tv
, sizeof(tv
)) < 0)
724 syslog(LOG_ERR
, "setsockopt SO_RCVTIMEO failed (%s)",
728 len
= recvmsg(sock
, &msg
, 0);
732 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
733 ch
= CMSG_NXTHDR(&msg
, ch
)) {
734 if (ch
->cmsg_level
== SOL_IPV6
&&
735 ch
->cmsg_type
== IPV6_PKTINFO
) {
736 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
741 if (pktinfo
== NULL
) {
746 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
747 type
, &pktinfo
->ipi6_addr
)) {
752 uint8_t *opt
= &buf
[4];
753 uint8_t *opt_end
= opt
+ len
- 4;
755 round_start
= odhcp6c_get_milli_time();
756 elapsed
= round_start
- start
;
757 syslog(LOG_NOTICE
, "Got a valid %s after %"PRIu64
"ms",
758 dhcpv6_msg_to_str(hdr
->msg_type
), elapsed
);
760 if (retx
->handler_reply
)
761 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
763 if (len
> 0 && round_end
- round_start
> 1000)
764 round_end
= 1000 + round_start
;
768 if (retx
->handler_finish
)
769 len
= retx
->handler_finish();
770 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
771 (!retx
->max_rc
|| rc
< retx
->max_rc
));
775 // Message validation checks according to RFC3315 chapter 15
776 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
777 const uint8_t transaction
[3], enum dhcpv6_msg type
,
778 const struct in6_addr
*daddr
)
780 const struct dhcpv6_header
*rep
= buf
;
781 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
782 transaction
, sizeof(rep
->tr_id
)))
783 return false; // Invalid reply
785 if (type
== DHCPV6_MSG_SOLICIT
) {
786 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
787 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
790 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
791 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
794 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
)
797 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
798 rcmsg
= DHCPV6_MSG_UNKNOWN
;
799 uint16_t otype
, olen
= UINT16_MAX
;
800 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
801 ia_present
= false, options_valid
= true;
803 size_t client_id_len
, server_id_len
;
804 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
805 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
807 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
808 if (otype
== DHCPV6_OPT_CLIENTID
) {
809 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
810 &odata
[-4], client_id
, client_id_len
);
811 } else if (otype
== DHCPV6_OPT_SERVERID
) {
813 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
814 &odata
[-4], server_id
, server_id_len
);
817 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
818 sizeof(struct dhcpv6_auth_reconfigure
)) {
819 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
820 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
824 uint8_t serverhash
[16], secretbytes
[64];
826 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
827 memset(r
->key
, 0, sizeof(r
->key
));
829 memset(secretbytes
, 0, sizeof(secretbytes
));
830 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
832 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
833 secretbytes
[i
] ^= 0x36;
836 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
837 md5_hash(buf
, len
, &md5
);
840 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
841 secretbytes
[i
] ^= 0x36;
842 secretbytes
[i
] ^= 0x5c;
846 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
847 md5_hash(hash
, 16, &md5
);
850 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
851 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
853 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
855 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
856 options_valid
= false;
857 } else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
858 (otype
== DHCPV6_OPT_PD_EXCLUDE
))
859 // Options are not allowed on global level
860 options_valid
= false;
863 if (!options_valid
|| ((odata
+ olen
) > end
))
866 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
869 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
870 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_REBIND
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
871 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
872 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
876 return clientid_ok
&& serverid_ok
;
879 int dhcpv6_poll_reconfigure(void)
881 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
885 * Only RENEW/REBIND/INFORMATION REQUEST
886 * message transmission can be requested
889 case DHCPV6_MSG_RENEW
:
890 case DHCPV6_MSG_REBIND
:
891 case DHCPV6_MSG_INFO_REQ
:
892 ret
= dhcpv6_request(ret
);
902 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig
, const int rc
,
903 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
905 uint16_t otype
, olen
;
907 enum dhcpv6_msg msg
= DHCPV6_MSG_UNKNOWN
;
909 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
910 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
912 case DHCPV6_MSG_REBIND
:
913 if (t2
!= UINT32_MAX
)
916 case DHCPV6_MSG_RENEW
:
917 if (t1
!= UINT32_MAX
)
920 case DHCPV6_MSG_INFO_REQ
:
922 syslog(LOG_NOTICE
, "Need to respond with %s in reply to %s",
923 dhcpv6_msg_to_str(msg
), dhcpv6_msg_to_str(DHCPV6_MSG_RECONF
));
932 if (msg
!= DHCPV6_MSG_UNKNOWN
)
933 dhcpv6_handle_reply(orig
, rc
, NULL
, NULL
, NULL
);
935 return (msg
== DHCPV6_MSG_UNKNOWN
? -1: (int)msg
);
938 // Collect all advertised servers
939 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
940 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
942 uint16_t olen
, otype
;
943 uint8_t *odata
, pref
= 0;
944 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
945 IN6ADDR_ANY_INIT
, DHCPV6_SOL_MAX_RT
,
946 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
947 bool have_na
= false;
950 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
951 if (orig
== DHCPV6_MSG_SOLICIT
&&
952 ((otype
== DHCPV6_OPT_IA_PD
&& pd_mode
!= IA_MODE_NONE
) ||
953 (otype
== DHCPV6_OPT_IA_NA
&& na_mode
!= IA_MODE_NONE
)) &&
954 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
955 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
956 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
959 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
960 memcpy(cand
.duid
, odata
, olen
);
961 cand
.duid_len
= olen
;
962 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
963 cand
.preference
>= 0) {
964 cand
.preference
= pref
= odata
[0];
965 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(cand
.server_addr
)) {
966 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
967 cand
.server_addr
= *(struct in6_addr
*)odata
;
969 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
970 cand
.wants_reconfigure
= true;
971 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
972 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
973 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
974 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
975 cand
.sol_max_rt
= sol_max_rt
;
977 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
978 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
979 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
980 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
981 cand
.inf_max_rt
= inf_max_rt
;
983 } else if (otype
== DHCPV6_OPT_IA_PD
&&
984 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
985 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
986 uint8_t *oend
= odata
+ olen
, *d
;
987 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
988 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
989 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
990 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
994 } else if (otype
== DHCPV6_OPT_IA_NA
&&
995 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
996 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
997 uint8_t *oend
= odata
+ olen
, *d
;
999 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
1000 if (otype
== DHCPV6_OPT_IA_ADDR
&&
1001 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
1007 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
1008 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
1010 * RFC7083 states to process the SOL_MAX_RT and
1011 * INF_MAX_RT options even if the DHCPv6 server
1012 * did not propose any IA_NA and/or IA_PD
1014 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
1015 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
1019 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
1020 cand
.has_noaddravail
= true;
1021 cand
.preference
-= 1000;
1024 if (pd_mode
!= IA_MODE_NONE
) {
1026 cand
.preference
+= 2000 + (128 - have_pd
);
1028 cand
.preference
-= 2000;
1031 if (cand
.duid_len
> 0) {
1032 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
1033 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
1034 dhcpv6_add_server_cand(&cand
);
1037 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
1040 static int dhcpv6_commit_advert(void)
1042 return dhcpv6_promote_server_cand();
1045 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
1046 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
1048 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
1049 if (dhcpv6_commit_advert() < 0)
1052 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
1055 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
1056 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
1059 uint16_t otype
, olen
;
1060 uint32_t refresh
= 86400;
1062 unsigned int state_IAs
;
1063 unsigned int updated_IAs
= 0;
1064 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
1066 odhcp6c_expire(true);
1068 if (orig
== DHCPV6_MSG_UNKNOWN
) {
1069 static time_t last_update
= 0;
1070 time_t now
= odhcp6c_get_milli_time() / 1000;
1072 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
1075 if (t1
!= UINT32_MAX
)
1078 if (t2
!= UINT32_MAX
)
1081 if (t3
!= UINT32_MAX
)
1094 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
1095 // Delete NA and PD we have in the state from the Advert
1096 odhcp6c_clear_state(STATE_IA_NA
);
1097 odhcp6c_clear_state(STATE_IA_PD
);
1101 odhcp6c_clear_state(STATE_DNS
);
1102 odhcp6c_clear_state(STATE_SEARCH
);
1103 odhcp6c_clear_state(STATE_SNTP_IP
);
1104 odhcp6c_clear_state(STATE_NTP_IP
);
1105 odhcp6c_clear_state(STATE_NTP_FQDN
);
1106 odhcp6c_clear_state(STATE_SIP_IP
);
1107 odhcp6c_clear_state(STATE_SIP_FQDN
);
1108 odhcp6c_clear_state(STATE_AFTR_NAME
);
1109 odhcp6c_clear_state(STATE_CER
);
1110 odhcp6c_clear_state(STATE_S46_MAPT
);
1111 odhcp6c_clear_state(STATE_S46_MAPE
);
1112 odhcp6c_clear_state(STATE_S46_LW
);
1113 odhcp6c_clear_state(STATE_PASSTHRU
);
1114 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
1116 // Parse and find all matching IAs
1117 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
1118 struct odhcp6c_opt
*dopt
= odhcp6c_find_opt(otype
);
1120 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
1121 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
1122 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
1124 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
1125 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
1129 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
1132 uint16_t code
= DHCPV6_Success
;
1133 uint16_t stype
, slen
;
1135 // Get and handle status code
1136 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
1137 stype
, slen
, sdata
) {
1138 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
1139 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
1140 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
1142 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
1144 if (code
== DHCPV6_Success
)
1147 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
1148 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1157 if (code
!= DHCPV6_Success
)
1160 updated_IAs
+= dhcpv6_parse_ia(ia_hdr
, odata
+ olen
);
1161 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(server_addr
)) {
1162 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
1163 server_addr
= *(struct in6_addr
*)odata
;
1166 else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1167 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1168 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1169 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1171 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1172 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1174 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1175 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
)
1176 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1177 else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1179 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1180 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1181 uint16_t stype
, slen
;
1183 // Test status and bail if error
1184 dhcpv6_for_each_option(odata
, odata
+ olen
,
1185 stype
, slen
, sdata
) {
1186 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1187 stype
== NTP_SRV_ADDR
))
1188 odhcp6c_add_state(STATE_NTP_IP
,
1190 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1191 odhcp6c_add_state(STATE_NTP_FQDN
,
1194 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1196 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1197 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
)
1198 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1199 else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1200 refresh
= ntohl_unaligned(odata
);
1201 } else if (otype
== DHCPV6_OPT_AUTH
) {
1202 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1203 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1204 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1205 r
->reconf_type
== 1)
1206 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1208 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1210 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1212 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1213 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1214 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1215 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1216 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1217 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1218 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1219 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1220 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1221 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1222 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1224 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1225 sizeof(struct dhcpv6_cer_id
)) {
1226 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1227 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1228 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1229 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1231 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1232 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1233 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1235 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1237 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1238 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1239 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1241 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1243 if (!dopt
|| !(dopt
->flags
& OPT_NO_PASSTHRU
))
1244 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1248 // Bail out if fatal status code was received
1253 case DHCPV6_MSG_REQUEST
:
1254 case DHCPV6_MSG_REBIND
:
1255 case DHCPV6_MSG_RENEW
:
1256 state_IAs
= dhcpv6_calc_refresh_timers();
1257 // In case there're no state IA entries
1258 // keep sending request/renew/rebind messages
1259 if (state_IAs
== 0) {
1264 if (orig
== DHCPV6_MSG_REQUEST
) {
1265 // All server candidates can be cleared if not yet bound
1266 if (!odhcp6c_is_bound())
1267 dhcpv6_clear_all_server_cand();
1269 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1270 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1271 } else if (orig
== DHCPV6_MSG_RENEW
) {
1272 // Send further renews if T1 is not set and if
1273 // there're IAs which were not in the Reply message
1274 if (!t1
&& state_IAs
!= updated_IAs
) {
1277 script_call("updated", 0, false);
1280 * RFC8415 states following in §18.2.10.1 :
1281 * Sends a Renew/Rebind if any of the IAs are not in the Reply
1282 * message, but as this likely indicates that the server that
1283 * responded does not support that IA type, sending immediately is
1284 * unlikely to produce a different result. Therefore, the client
1285 * MUST rate-limit its transmissions (see Section 14.1) and MAY just
1286 * wait for the normal retransmission time (as if the Reply message
1287 * had not been received). The client continues to use other
1288 * bindings for which the server did return information
1292 } else if (orig
== DHCPV6_MSG_REBIND
) {
1293 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1294 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1296 // Send further rebinds if T1 and T2 is not set and if
1297 // there're IAs which were not in the Reply message
1298 if (!t1
&& !t2
&& state_IAs
!= updated_IAs
) {
1301 script_call("updated", 0, false);
1304 * RFC8415 states following in §18.2.10.1 :
1305 * Sends a Renew/Rebind if any of the IAs are not in the Reply
1306 * message, but as this likely indicates that the server that
1307 * responded does not support that IA type, sending immediately is
1308 * unlikely to produce a different result. Therefore, the client
1309 * MUST rate-limit its transmissions (see Section 14.1) and MAY just
1310 * wait for the normal retransmission time (as if the Reply message
1311 * had not been received). The client continues to use other
1312 * bindings for which the server did return information
1319 case DHCPV6_MSG_INFO_REQ
:
1320 // All server candidates can be cleared if not yet bound
1321 if (!odhcp6c_is_bound())
1322 dhcpv6_clear_all_server_cand();
1334 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
)
1336 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1337 unsigned int updated_IAs
= 0;
1339 uint16_t otype
, olen
;
1341 char buf
[INET6_ADDRSTRLEN
];
1343 t1
= ntohl(ia_hdr
->t1
);
1344 t2
= ntohl(ia_hdr
->t2
);
1349 syslog(LOG_INFO
, "%s %04x T1 %d T2 %d", ntohs(ia_hdr
->type
) == DHCPV6_OPT_IA_PD
? "IA_PD" : "IA_NA", ntohl(ia_hdr
->iaid
), t1
, t2
);
1351 // Update address IA
1352 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1353 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0,
1354 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0, 0};
1356 entry
.iaid
= ia_hdr
->iaid
;
1358 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1359 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1360 if (olen
+ 4U < sizeof(*prefix
))
1363 entry
.valid
= ntohl(prefix
->valid
);
1364 entry
.preferred
= ntohl(prefix
->preferred
);
1366 if (entry
.preferred
> entry
.valid
)
1369 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1370 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1371 if (entry
.t1
> entry
.t2
)
1372 entry
.t1
= entry
.t2
;
1374 entry
.length
= prefix
->prefix
;
1375 entry
.target
= prefix
->addr
;
1376 uint16_t stype
, slen
;
1381 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1382 odata
+ olen
, stype
, slen
, sdata
) {
1383 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1386 uint8_t elen
= sdata
[0];
1390 if (entry
.length
< 32 || elen
<= entry
.length
) {
1395 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1396 if (slen
<= bytes
) {
1401 uint32_t exclude
= 0;
1403 exclude
= exclude
<< 8 | sdata
[bytes
];
1406 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1407 exclude
<<= 64 - elen
;
1409 // Abusing router & priority fields for exclusion
1410 entry
.router
= entry
.target
;
1411 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1412 entry
.priority
= elen
;
1416 if (odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, 0))
1419 syslog(LOG_INFO
, "%s/%d preferred %d valid %d",
1420 inet_ntop(AF_INET6
, &entry
.target
, buf
, sizeof(buf
)),
1421 entry
.length
, entry
.preferred
, entry
.valid
);
1425 memset(&entry
.router
, 0, sizeof(entry
.router
));
1426 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1427 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1428 if (olen
+ 4U < sizeof(*addr
))
1431 entry
.preferred
= ntohl(addr
->preferred
);
1432 entry
.valid
= ntohl(addr
->valid
);
1434 if (entry
.preferred
> entry
.valid
)
1437 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1438 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1439 if (entry
.t1
> entry
.t2
)
1440 entry
.t1
= entry
.t2
;
1443 entry
.target
= addr
->addr
;
1445 if (odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, 0))
1448 syslog(LOG_INFO
, "%s preferred %d valid %d",
1449 inet_ntop(AF_INET6
, &entry
.target
, buf
, sizeof(buf
)),
1450 entry
.preferred
, entry
.valid
);
1457 static unsigned int dhcpv6_calc_refresh_timers(void)
1459 struct odhcp6c_entry
*e
;
1460 size_t ia_na_entries
, ia_pd_entries
, i
;
1461 size_t invalid_entries
= 0;
1462 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1464 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1465 ia_na_entries
/= sizeof(*e
);
1467 for (i
= 0; i
< ia_na_entries
; i
++) {
1468 /* Exclude invalid IA_NA entries */
1480 if (e
[i
].valid
> l_t3
)
1484 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1485 ia_pd_entries
/= sizeof(*e
);
1487 for (i
= 0; i
< ia_pd_entries
; i
++) {
1488 /* Exclude invalid IA_PD entries */
1500 if (e
[i
].valid
> l_t3
)
1504 if (ia_pd_entries
+ ia_na_entries
- invalid_entries
) {
1509 syslog(LOG_INFO
, "T1 %"PRId64
"s, T2 %"PRId64
"s, T3 %"PRId64
"s", t1
, t2
, t3
);
1512 return (unsigned int)(ia_pd_entries
+ ia_na_entries
);
1515 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1516 const void *status_msg
, int len
)
1518 const char *src
= status_msg
;
1525 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1534 syslog(LOG_WARNING
, "Server returned %s status '%s %s'",
1535 scope
, dhcpv6_status_code_to_str(code
), buf
);
1538 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1539 const uint16_t code
, const void *status_msg
, const int len
,
1542 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1545 case DHCPV6_UnspecFail
:
1550 case DHCPV6_UseMulticast
:
1552 case DHCPV6_MSG_REQUEST
:
1553 case DHCPV6_MSG_RENEW
:
1554 case DHCPV6_MSG_RELEASE
:
1555 case DHCPV6_MSG_DECLINE
:
1556 // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1557 server_addr
= in6addr_any
;
1565 case DHCPV6_NoAddrsAvail
:
1566 case DHCPV6_NoPrefixAvail
:
1567 if (orig
== DHCPV6_MSG_REQUEST
)
1568 *ret
= 0; // Failure
1576 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1577 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1578 const void *status_msg
, const int len
,
1579 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1581 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1582 "IA_NA" : "IA_PD", status_msg
, len
);
1585 case DHCPV6_NoBinding
:
1587 case DHCPV6_MSG_RENEW
:
1588 case DHCPV6_MSG_REBIND
:
1589 if ((*ret
> 0) && !handled_status_codes
[code
])
1590 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1604 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1605 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1608 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1610 // Remove identical duid server candidate
1611 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1612 if (cand
->duid_len
== c
[i
].duid_len
&&
1613 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1616 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1621 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1622 i
< cand_len
/ sizeof(*c
); ++i
) {
1623 if (c
[i
].preference
< cand
->preference
)
1627 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1633 static void dhcpv6_clear_all_server_cand(void)
1636 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1638 // Server candidates need deep delete for IA_NA/IA_PD
1639 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1643 odhcp6c_clear_state(STATE_SERVER_CAND
);
1646 int dhcpv6_promote_server_cand(void)
1649 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1651 int ret
= DHCPV6_STATELESS
;
1653 // Clear lingering candidate state info
1654 odhcp6c_clear_state(STATE_SERVER_ID
);
1655 odhcp6c_clear_state(STATE_IA_NA
);
1656 odhcp6c_clear_state(STATE_IA_PD
);
1661 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1662 na_mode
= IA_MODE_NONE
;
1664 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1665 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1667 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1670 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1671 hdr
[1] = htons(cand
->duid_len
);
1672 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1673 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1674 accept_reconfig
= cand
->wants_reconfigure
;
1676 if (cand
->ia_na_len
) {
1677 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1679 if (na_mode
!= IA_MODE_NONE
)
1680 ret
= DHCPV6_STATEFUL
;
1683 if (cand
->ia_pd_len
) {
1684 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1686 if (pd_mode
!= IA_MODE_NONE
)
1687 ret
= DHCPV6_STATEFUL
;
1690 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1691 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1693 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));