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 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
167 client_options
= options
;
168 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
170 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
176 memset(&ifr
, 0, sizeof(ifr
));
177 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
) - 1);
178 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
181 ifindex
= ifr
.ifr_ifindex
;
183 // Create client DUID
184 size_t client_id_len
;
185 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
186 if (client_id_len
== 0) {
187 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
188 DHCPV6_DUID_LLADDR
, 0, 1};
190 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
191 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
193 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
194 struct ifreq ifs
[100], *ifp
, *ifend
;
197 ifc
.ifc_len
= sizeof(ifs
);
199 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
200 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
201 // If our interface doesn't have an address...
202 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
203 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
204 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
205 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
206 sizeof(ifr
.ifr_name
));
207 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
210 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
215 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
219 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
221 htons(DHCPV6_OPT_SIP_SERVER_D
),
222 htons(DHCPV6_OPT_SIP_SERVER_A
),
223 htons(DHCPV6_OPT_DNS_SERVERS
),
224 htons(DHCPV6_OPT_DNS_DOMAIN
),
225 htons(DHCPV6_OPT_SNTP_SERVERS
),
226 htons(DHCPV6_OPT_NTP_SERVER
),
227 htons(DHCPV6_OPT_AFTR_NAME
),
228 htons(DHCPV6_OPT_PD_EXCLUDE
),
230 htons(DHCPV6_OPT_CER_ID
),
232 htons(DHCPV6_OPT_S46_CONT_MAPE
),
233 htons(DHCPV6_OPT_S46_CONT_MAPT
),
234 htons(DHCPV6_OPT_S46_CONT_LW
),
236 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
239 uint16_t req_oro
[] = {
240 htons(DHCPV6_OPT_INF_MAX_RT
),
241 htons(DHCPV6_OPT_SOL_MAX_RT
),
242 htons(DHCPV6_OPT_INFO_REFRESH
),
244 odhcp6c_add_state(STATE_ORO
, req_oro
, sizeof(req_oro
));
246 // Configure IPv6-options
248 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
)) < 0)
251 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
)) < 0)
254 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
)) < 0)
257 if (setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
)) < 0)
260 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
261 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
263 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
289 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
291 int mode
= DHCPV6_UNKNOWN
;
296 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
297 mode
= DHCPV6_STATELESS
;
298 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
299 mode
= DHCPV6_STATEFUL
;
304 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
308 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
315 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
316 sizeof(fqdn
.data
), NULL
, NULL
);
317 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
318 fqdn
.len
= htons(fqdn_len
- 4);
323 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
327 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
330 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
333 if (type
== DHCPV6_MSG_SOLICIT
) {
334 odhcp6c_clear_state(STATE_IA_PD
);
336 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
337 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
339 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
341 for (size_t i
= 0; i
< n_prefixes
; i
++) {
342 struct dhcpv6_ia_hdr hdr_ia_pd
= {
343 htons(DHCPV6_OPT_IA_PD
),
344 htons(sizeof(hdr_ia_pd
) - 4 +
345 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
346 request_prefixes
[i
].iaid
, 0, 0
348 struct dhcpv6_ia_prefix pref
= {
349 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
350 .len
= htons(sizeof(pref
) - 4),
351 .prefix
= request_prefixes
[i
].length
353 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
354 ia_pd_len
+= sizeof(hdr_ia_pd
);
355 if (request_prefixes
[i
].length
) {
356 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
357 ia_pd_len
+= sizeof(pref
);
361 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
362 ia_pd_entries
/= sizeof(*e
);
364 // we're too lazy to count our distinct IAIDs,
365 // so just allocate maximally needed space
366 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
367 sizeof(struct dhcpv6_ia_hdr
)));
369 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
370 uint32_t iaid
= e
[i
].iaid
;
372 // check if this is an unprocessed IAID and skip if not.
374 for (int j
= i
-1; j
>= 0; j
--) {
375 if (e
[j
].iaid
== iaid
) {
385 struct dhcpv6_ia_hdr hdr_ia_pd
= {
386 htons(DHCPV6_OPT_IA_PD
),
387 htons(sizeof(hdr_ia_pd
) - 4),
391 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
392 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
393 ia_pd_len
+= sizeof(hdr_ia_pd
);
395 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
396 if (e
[j
].iaid
!= iaid
)
400 if (e
[j
].priority
> 0)
401 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
403 struct dhcpv6_ia_prefix p
= {
404 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
405 .len
= htons(sizeof(p
) - 4U + ex_len
),
406 .prefix
= e
[j
].length
,
410 if (type
== DHCPV6_MSG_REQUEST
) {
411 p
.preferred
= htonl(e
[j
].preferred
);
412 p
.valid
= htonl(e
[j
].valid
);
415 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
416 ia_pd_len
+= sizeof(p
);
419 ia_pd
[ia_pd_len
++] = 0;
420 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
421 ia_pd
[ia_pd_len
++] = 0;
422 ia_pd
[ia_pd_len
++] = ex_len
- 4;
423 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
425 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
426 excl
>>= (64 - e
[j
].priority
);
427 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
429 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
430 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
431 ia_pd_len
+= ex_len
- 5;
434 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
440 size_t ia_na_entries
, ia_na_len
= 0;
442 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
443 ia_na_entries
/= sizeof(*e
);
445 struct dhcpv6_ia_hdr hdr_ia_na
= {
446 htons(DHCPV6_OPT_IA_NA
),
447 htons(sizeof(hdr_ia_na
) - 4),
451 struct dhcpv6_ia_addr pa
[ia_na_entries
];
452 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
453 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
454 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
455 pa
[i
].addr
= e
[i
].target
;
457 if (type
== DHCPV6_MSG_REQUEST
) {
458 pa
[i
].preferred
= htonl(e
[i
].preferred
);
459 pa
[i
].valid
= htonl(e
[i
].valid
);
467 ia_na_len
= sizeof(pa
);
468 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
470 // Reconfigure Accept
474 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
478 void *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
480 // Option Request List
481 size_t oro_entries
, oro_len
= 0;
482 uint16_t *oro
, *s_oro
= odhcp6c_get_state(STATE_ORO
, &oro_entries
);
484 oro_entries
/= sizeof(*s_oro
);
485 oro
= alloca(oro_entries
* sizeof(*oro
));
487 for (size_t i
= 0; i
< oro_entries
; i
++) {
488 struct odhcp6c_opt
*opt
= odhcp6c_find_opt(htons(s_oro
[i
]));
491 if (!(opt
->flags
& OPT_ORO
))
494 if ((opt
->flags
& OPT_ORO_SOLICIT
) && type
!= DHCPV6_MSG_SOLICIT
)
497 if ((opt
->flags
& OPT_ORO_STATELESS
) && type
!= DHCPV6_MSG_INFO_REQ
)
500 if ((opt
->flags
& OPT_ORO_STATEFUL
) && type
== DHCPV6_MSG_INFO_REQ
)
504 oro
[oro_len
++] = s_oro
[i
];
506 oro_len
*= sizeof(*oro
);
512 uint16_t elapsed_type
;
513 uint16_t elapsed_len
;
514 uint16_t elapsed_value
;
518 type
, {trid
[0], trid
[1], trid
[2]},
519 htons(DHCPV6_OPT_ELAPSED
), htons(2),
520 htons((ecs
> 0xffff) ? 0xffff : ecs
),
521 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
524 struct iovec iov
[IOV_TOTAL
] = {
525 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
526 [IOV_ORO
] = {oro
, oro_len
},
527 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
528 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
529 [IOV_OPTS
] = { opts
, opts_len
},
530 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
531 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
532 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
533 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
534 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
537 size_t cnt
= IOV_TOTAL
;
538 if (type
== DHCPV6_MSG_INFO_REQ
)
541 // Disable IAs if not used
542 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
543 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
545 if (na_mode
== IA_MODE_NONE
)
546 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
548 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
549 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
550 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
552 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
553 iov
[IOV_FQDN
].iov_len
= 0;
555 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
556 0, ALL_DHCPV6_RELAYS
, ifindex
};
557 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
558 .msg_iov
= iov
, .msg_iovlen
= cnt
};
561 case DHCPV6_MSG_REQUEST
:
562 case DHCPV6_MSG_RENEW
:
563 case DHCPV6_MSG_RELEASE
:
564 case DHCPV6_MSG_DECLINE
:
565 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr
) &&
566 odhcp6c_addr_in_scope(&server_addr
)) {
567 srv
.sin6_addr
= server_addr
;
568 if (!IN6_IS_ADDR_LINKLOCAL(&server_addr
))
569 srv
.sin6_scope_id
= 0;
576 if (sendmsg(sock
, &msg
, 0) < 0) {
577 char in6_str
[INET6_ADDRSTRLEN
];
579 syslog(LOG_ERR
, "Failed to send %s message to %s (%s)",
580 dhcpv6_msg_to_str(type
),
581 inet_ntop(AF_INET6
, (const void *)&srv
.sin6_addr
,
582 in6_str
, sizeof(in6_str
)), strerror(errno
));
586 static int64_t dhcpv6_rand_delay(int64_t time
)
589 odhcp6c_random(&random
, sizeof(random
));
591 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
594 int dhcpv6_request(enum dhcpv6_msg type
)
597 uint64_t timeout
= UINT32_MAX
;
598 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
601 struct timespec ts
= {0, 0};
602 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
604 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
607 if (type
== DHCPV6_MSG_UNKNOWN
)
609 else if (type
== DHCPV6_MSG_RENEW
)
610 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
611 else if (type
== DHCPV6_MSG_REBIND
)
612 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
617 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %"PRIu64
"s, max rc %d)",
618 retx
->name
, timeout
, retx
->max_rc
);
620 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
622 // Generate transaction ID
623 uint8_t trid
[3] = {0, 0, 0};
624 if (type
!= DHCPV6_MSG_UNKNOWN
)
625 odhcp6c_random(trid
, sizeof(trid
));
632 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
634 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
635 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
636 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
638 rto
= (retx
->init_timeo
* 1000 + delay
);
640 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
642 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
643 rto
= retx
->max_timeo
* 1000 +
644 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
646 // Calculate end for this round and elapsed time
647 uint64_t round_end
= round_start
+ rto
;
648 elapsed
= round_start
- start
;
650 // Don't wait too long if timeout differs from infinite
651 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
652 round_end
= timeout
* 1000 + start
;
654 // Built and send package
656 case DHCPV6_MSG_UNKNOWN
:
659 syslog(LOG_NOTICE
, "Send %s message (elapsed %"PRIu64
"ms, rc %d)",
660 retx
->name
, elapsed
, rc
);
662 case DHCPV6_MSG_SOLICIT
:
663 case DHCPV6_MSG_INFO_REQ
:
664 dhcpv6_send(type
, trid
, elapsed
/ 10);
669 for (; len
< 0 && (round_start
< round_end
);
670 round_start
= odhcp6c_get_milli_time()) {
674 uint8_t buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
676 struct iovec iov
= {buf
, sizeof(buf
)};
677 struct sockaddr_in6 addr
;
678 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
679 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
.buf
,
680 .msg_controllen
= sizeof(cmsg_buf
)};
681 struct in6_pktinfo
*pktinfo
= NULL
;
682 const struct dhcpv6_header
*hdr
= (const struct dhcpv6_header
*)buf
;
684 // Check for pending signal
685 if (odhcp6c_signal_process())
688 // Set timeout for receiving
689 uint64_t t
= round_end
- round_start
;
690 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
691 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
692 &tv
, sizeof(tv
)) < 0)
693 syslog(LOG_ERR
, "setsockopt SO_RCVTIMEO failed (%s)",
697 len
= recvmsg(sock
, &msg
, 0);
701 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
702 ch
= CMSG_NXTHDR(&msg
, ch
)) {
703 if (ch
->cmsg_level
== SOL_IPV6
&&
704 ch
->cmsg_type
== IPV6_PKTINFO
) {
705 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
710 if (pktinfo
== NULL
) {
715 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
716 type
, &pktinfo
->ipi6_addr
)) {
721 uint8_t *opt
= &buf
[4];
722 uint8_t *opt_end
= opt
+ len
- 4;
724 round_start
= odhcp6c_get_milli_time();
725 elapsed
= round_start
- start
;
726 syslog(LOG_NOTICE
, "Got a valid %s after %"PRIu64
"ms",
727 dhcpv6_msg_to_str(hdr
->msg_type
), elapsed
);
729 if (retx
->handler_reply
)
730 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
732 if (len
> 0 && round_end
- round_start
> 1000)
733 round_end
= 1000 + round_start
;
737 if (retx
->handler_finish
)
738 len
= retx
->handler_finish();
739 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
740 (!retx
->max_rc
|| rc
< retx
->max_rc
));
744 // Message validation checks according to RFC3315 chapter 15
745 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
746 const uint8_t transaction
[3], enum dhcpv6_msg type
,
747 const struct in6_addr
*daddr
)
749 const struct dhcpv6_header
*rep
= buf
;
750 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
751 transaction
, sizeof(rep
->tr_id
)))
752 return false; // Invalid reply
754 if (type
== DHCPV6_MSG_SOLICIT
) {
755 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
756 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
759 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
760 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
763 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
)
766 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
767 rcmsg
= DHCPV6_MSG_UNKNOWN
;
768 uint16_t otype
, olen
= UINT16_MAX
;
769 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
770 ia_present
= false, options_valid
= true;
772 size_t client_id_len
, server_id_len
;
773 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
774 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
776 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
777 if (otype
== DHCPV6_OPT_CLIENTID
) {
778 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
779 &odata
[-4], client_id
, client_id_len
);
780 } else if (otype
== DHCPV6_OPT_SERVERID
) {
782 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
783 &odata
[-4], server_id
, server_id_len
);
786 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
787 sizeof(struct dhcpv6_auth_reconfigure
)) {
788 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
789 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
793 uint8_t serverhash
[16], secretbytes
[64];
795 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
796 memset(r
->key
, 0, sizeof(r
->key
));
798 memset(secretbytes
, 0, sizeof(secretbytes
));
799 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
801 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
802 secretbytes
[i
] ^= 0x36;
805 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
806 md5_hash(buf
, len
, &md5
);
809 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
810 secretbytes
[i
] ^= 0x36;
811 secretbytes
[i
] ^= 0x5c;
815 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
816 md5_hash(hash
, 16, &md5
);
819 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
820 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
822 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
824 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
825 options_valid
= false;
826 } else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
827 (otype
== DHCPV6_OPT_PD_EXCLUDE
))
828 // Options are not allowed on global level
829 options_valid
= false;
832 if (!options_valid
|| ((odata
+ olen
) > end
))
835 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
838 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
839 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_REBIND
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
840 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
841 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
845 return clientid_ok
&& serverid_ok
;
848 int dhcpv6_poll_reconfigure(void)
850 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
853 ret
= dhcpv6_request(ret
);
858 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig
, const int rc
,
859 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
861 uint16_t otype
, olen
;
863 enum dhcpv6_msg msg
= DHCPV6_MSG_UNKNOWN
;
865 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
866 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
868 case DHCPV6_MSG_REBIND
:
869 if (t2
!= UINT32_MAX
)
872 case DHCPV6_MSG_RENEW
:
873 if (t1
!= UINT32_MAX
)
876 case DHCPV6_MSG_INFO_REQ
:
878 syslog(LOG_NOTICE
, "Need to respond with %s in reply to %s",
879 dhcpv6_msg_to_str(msg
), dhcpv6_msg_to_str(DHCPV6_MSG_RECONF
));
888 if (msg
!= DHCPV6_MSG_UNKNOWN
)
889 dhcpv6_handle_reply(orig
, rc
, NULL
, NULL
, NULL
);
891 return (msg
== DHCPV6_MSG_UNKNOWN
? -1: (int)msg
);
894 // Collect all advertised servers
895 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
896 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
898 uint16_t olen
, otype
;
899 uint8_t *odata
, pref
= 0;
900 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
901 IN6ADDR_ANY_INIT
, DHCPV6_SOL_MAX_RT
,
902 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
903 bool have_na
= false;
906 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
907 if (orig
== DHCPV6_MSG_SOLICIT
&&
908 ((otype
== DHCPV6_OPT_IA_PD
&& pd_mode
!= IA_MODE_NONE
) ||
909 (otype
== DHCPV6_OPT_IA_NA
&& na_mode
!= IA_MODE_NONE
)) &&
910 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
911 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
912 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
915 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
916 memcpy(cand
.duid
, odata
, olen
);
917 cand
.duid_len
= olen
;
918 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
919 cand
.preference
>= 0) {
920 cand
.preference
= pref
= odata
[0];
921 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(cand
.server_addr
)) {
922 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
923 cand
.server_addr
= *(struct in6_addr
*)odata
;
925 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
926 cand
.wants_reconfigure
= true;
927 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
928 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
929 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
930 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
931 cand
.sol_max_rt
= sol_max_rt
;
933 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
934 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
935 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
936 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
937 cand
.inf_max_rt
= inf_max_rt
;
939 } else if (otype
== DHCPV6_OPT_IA_PD
&&
940 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
941 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
942 uint8_t *oend
= odata
+ olen
, *d
;
943 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
944 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
945 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
946 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
950 } else if (otype
== DHCPV6_OPT_IA_NA
&&
951 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
952 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
953 uint8_t *oend
= odata
+ olen
, *d
;
955 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
956 if (otype
== DHCPV6_OPT_IA_ADDR
&&
957 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
963 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
964 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
966 * RFC7083 states to process the SOL_MAX_RT and
967 * INF_MAX_RT options even if the DHCPv6 server
968 * did not propose any IA_NA and/or IA_PD
970 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
971 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
975 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
976 cand
.has_noaddravail
= true;
977 cand
.preference
-= 1000;
980 if (pd_mode
!= IA_MODE_NONE
) {
982 cand
.preference
+= 2000 + (128 - have_pd
);
984 cand
.preference
-= 2000;
987 if (cand
.duid_len
> 0) {
988 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
989 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
990 dhcpv6_add_server_cand(&cand
);
993 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
996 static int dhcpv6_commit_advert(void)
998 return dhcpv6_promote_server_cand();
1001 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
1002 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
1004 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
1005 if (dhcpv6_commit_advert() < 0)
1008 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
1011 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
1012 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
1015 uint16_t otype
, olen
;
1016 uint32_t refresh
= 86400;
1018 unsigned int state_IAs
;
1019 unsigned int updated_IAs
= 0;
1020 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
1024 if (orig
== DHCPV6_MSG_UNKNOWN
) {
1025 static time_t last_update
= 0;
1026 time_t now
= odhcp6c_get_milli_time() / 1000;
1028 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
1031 if (t1
!= UINT32_MAX
)
1034 if (t2
!= UINT32_MAX
)
1037 if (t3
!= UINT32_MAX
)
1050 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
1051 // Delete NA and PD we have in the state from the Advert
1052 odhcp6c_clear_state(STATE_IA_NA
);
1053 odhcp6c_clear_state(STATE_IA_PD
);
1057 odhcp6c_clear_state(STATE_DNS
);
1058 odhcp6c_clear_state(STATE_SEARCH
);
1059 odhcp6c_clear_state(STATE_SNTP_IP
);
1060 odhcp6c_clear_state(STATE_NTP_IP
);
1061 odhcp6c_clear_state(STATE_NTP_FQDN
);
1062 odhcp6c_clear_state(STATE_SIP_IP
);
1063 odhcp6c_clear_state(STATE_SIP_FQDN
);
1064 odhcp6c_clear_state(STATE_AFTR_NAME
);
1065 odhcp6c_clear_state(STATE_CER
);
1066 odhcp6c_clear_state(STATE_S46_MAPT
);
1067 odhcp6c_clear_state(STATE_S46_MAPE
);
1068 odhcp6c_clear_state(STATE_S46_LW
);
1069 odhcp6c_clear_state(STATE_PASSTHRU
);
1070 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
1072 // Parse and find all matching IAs
1073 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
1074 struct odhcp6c_opt
*dopt
= odhcp6c_find_opt(otype
);
1076 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
1077 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
1078 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
1080 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
1081 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
1085 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
1088 uint16_t code
= DHCPV6_Success
;
1089 uint16_t stype
, slen
;
1091 // Get and handle status code
1092 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
1093 stype
, slen
, sdata
) {
1094 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
1095 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
1096 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
1098 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
1100 if (code
== DHCPV6_Success
)
1103 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
1104 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1113 if (code
!= DHCPV6_Success
)
1116 updated_IAs
+= dhcpv6_parse_ia(ia_hdr
, odata
+ olen
);
1117 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(server_addr
)) {
1118 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
1119 server_addr
= *(struct in6_addr
*)odata
;
1122 else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1123 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1124 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1125 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1127 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1128 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1130 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1131 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
)
1132 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1133 else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1135 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1136 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1137 uint16_t stype
, slen
;
1139 // Test status and bail if error
1140 dhcpv6_for_each_option(odata
, odata
+ olen
,
1141 stype
, slen
, sdata
) {
1142 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1143 stype
== NTP_SRV_ADDR
))
1144 odhcp6c_add_state(STATE_NTP_IP
,
1146 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1147 odhcp6c_add_state(STATE_NTP_FQDN
,
1150 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1152 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1153 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
)
1154 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1155 else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1156 refresh
= ntohl_unaligned(odata
);
1157 } else if (otype
== DHCPV6_OPT_AUTH
) {
1158 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1159 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1160 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1161 r
->reconf_type
== 1)
1162 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1164 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1166 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1168 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1169 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1170 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1171 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1172 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1173 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1174 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1175 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1176 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1177 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1178 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1180 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1181 sizeof(struct dhcpv6_cer_id
)) {
1182 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1183 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1184 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1185 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1187 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1188 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1189 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1191 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1193 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1194 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1195 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1197 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1199 if (!dopt
|| !(dopt
->flags
& OPT_NO_PASSTHRU
))
1200 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1204 // Bail out if fatal status code was received
1209 case DHCPV6_MSG_REQUEST
:
1210 case DHCPV6_MSG_REBIND
:
1211 case DHCPV6_MSG_RENEW
:
1212 state_IAs
= dhcpv6_calc_refresh_timers();
1213 // In case there're no state IA entries
1214 // keep sending request/renew/rebind messages
1215 if (state_IAs
== 0) {
1220 if (orig
== DHCPV6_MSG_REQUEST
) {
1221 // All server candidates can be cleared if not yet bound
1222 if (!odhcp6c_is_bound())
1223 dhcpv6_clear_all_server_cand();
1225 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1226 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1227 } else if (orig
== DHCPV6_MSG_RENEW
) {
1228 // Send further renews if T1 is not set and if
1229 // there're IAs which were not in the Reply message
1230 if (!t1
&& state_IAs
!= updated_IAs
) {
1233 script_call("updated", 0, false);
1236 * RFC8415 states following in §18.2.10.1 :
1237 * Sends a Renew/Rebind if any of the IAs are not in the Reply
1238 * message, but as this likely indicates that the server that
1239 * responded does not support that IA type, sending immediately is
1240 * unlikely to produce a different result. Therefore, the client
1241 * MUST rate-limit its transmissions (see Section 14.1) and MAY just
1242 * wait for the normal retransmission time (as if the Reply message
1243 * had not been received). The client continues to use other
1244 * bindings for which the server did return information
1248 } else if (orig
== DHCPV6_MSG_REBIND
) {
1249 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1250 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1252 // Send further rebinds if T1 and T2 is not set and if
1253 // there're IAs which were not in the Reply message
1254 if (!t1
&& !t2
&& state_IAs
!= updated_IAs
) {
1257 script_call("updated", 0, false);
1260 * RFC8415 states following in §18.2.10.1 :
1261 * Sends a Renew/Rebind if any of the IAs are not in the Reply
1262 * message, but as this likely indicates that the server that
1263 * responded does not support that IA type, sending immediately is
1264 * unlikely to produce a different result. Therefore, the client
1265 * MUST rate-limit its transmissions (see Section 14.1) and MAY just
1266 * wait for the normal retransmission time (as if the Reply message
1267 * had not been received). The client continues to use other
1268 * bindings for which the server did return information
1275 case DHCPV6_MSG_INFO_REQ
:
1276 // All server candidates can be cleared if not yet bound
1277 if (!odhcp6c_is_bound())
1278 dhcpv6_clear_all_server_cand();
1290 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
)
1292 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1293 unsigned int updated_IAs
= 0;
1295 uint16_t otype
, olen
;
1297 char buf
[INET6_ADDRSTRLEN
];
1299 t1
= ntohl(ia_hdr
->t1
);
1300 t2
= ntohl(ia_hdr
->t2
);
1305 syslog(LOG_INFO
, "IAID %04x T1 %d T2 %d", htonl(ia_hdr
->iaid
), t1
, t2
);
1307 // Update address IA
1308 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1309 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0,
1310 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0, 0};
1312 entry
.iaid
= ia_hdr
->iaid
;
1314 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1315 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1316 if (olen
+ 4U < sizeof(*prefix
))
1319 entry
.valid
= ntohl(prefix
->valid
);
1320 entry
.preferred
= ntohl(prefix
->preferred
);
1322 if (entry
.preferred
> entry
.valid
)
1325 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1326 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1327 if (entry
.t1
> entry
.t2
)
1328 entry
.t1
= entry
.t2
;
1330 entry
.length
= prefix
->prefix
;
1331 entry
.target
= prefix
->addr
;
1332 uint16_t stype
, slen
;
1337 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1338 odata
+ olen
, stype
, slen
, sdata
) {
1339 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1342 uint8_t elen
= sdata
[0];
1346 if (entry
.length
< 32 || elen
<= entry
.length
) {
1351 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1352 if (slen
<= bytes
) {
1357 uint32_t exclude
= 0;
1359 exclude
= exclude
<< 8 | sdata
[bytes
];
1362 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1363 exclude
<<= 64 - elen
;
1365 // Abusing router & priority fields for exclusion
1366 entry
.router
= entry
.target
;
1367 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1368 entry
.priority
= elen
;
1372 if (odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, 0))
1375 syslog(LOG_INFO
, "%s/%d preferred %d valid %d",
1376 inet_ntop(AF_INET6
, &entry
.target
, buf
, sizeof(buf
)),
1377 entry
.length
, entry
.preferred
, entry
.valid
);
1381 memset(&entry
.router
, 0, sizeof(entry
.router
));
1382 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1383 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1384 if (olen
+ 4U < sizeof(*addr
))
1387 entry
.preferred
= ntohl(addr
->preferred
);
1388 entry
.valid
= ntohl(addr
->valid
);
1390 if (entry
.preferred
> entry
.valid
)
1393 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1394 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1395 if (entry
.t1
> entry
.t2
)
1396 entry
.t1
= entry
.t2
;
1399 entry
.target
= addr
->addr
;
1401 if (odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, 0))
1404 syslog(LOG_INFO
, "%s preferred %d valid %d",
1405 inet_ntop(AF_INET6
, &entry
.target
, buf
, sizeof(buf
)),
1406 entry
.preferred
, entry
.valid
);
1413 static unsigned int dhcpv6_calc_refresh_timers(void)
1415 struct odhcp6c_entry
*e
;
1416 size_t ia_na_entries
, ia_pd_entries
, i
;
1417 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1419 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1420 ia_na_entries
/= sizeof(*e
);
1422 for (i
= 0; i
< ia_na_entries
; i
++) {
1429 if (e
[i
].valid
> l_t3
)
1433 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1434 ia_pd_entries
/= sizeof(*e
);
1436 for (i
= 0; i
< ia_pd_entries
; i
++) {
1443 if (e
[i
].valid
> l_t3
)
1447 if (ia_pd_entries
|| ia_na_entries
) {
1452 syslog(LOG_INFO
, "T1 %"PRId64
"s, T2 %"PRId64
"s, T3 %"PRId64
"s", t1
, t2
, t3
);
1455 return (unsigned int)(ia_pd_entries
+ ia_na_entries
);
1458 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1459 const void *status_msg
, int len
)
1461 const char *src
= status_msg
;
1468 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1477 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1481 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1482 const uint16_t code
, const void *status_msg
, const int len
,
1485 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1488 case DHCPV6_UnspecFail
:
1493 case DHCPV6_UseMulticast
:
1495 case DHCPV6_MSG_REQUEST
:
1496 case DHCPV6_MSG_RENEW
:
1497 case DHCPV6_MSG_RELEASE
:
1498 case DHCPV6_MSG_DECLINE
:
1499 // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1500 server_addr
= in6addr_any
;
1508 case DHCPV6_NoAddrsAvail
:
1509 case DHCPV6_NoPrefixAvail
:
1510 if (orig
== DHCPV6_MSG_REQUEST
)
1511 *ret
= 0; // Failure
1519 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1520 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1521 const void *status_msg
, const int len
,
1522 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1524 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1525 "IA_NA" : "IA_PD", status_msg
, len
);
1528 case DHCPV6_NoBinding
:
1530 case DHCPV6_MSG_RENEW
:
1531 case DHCPV6_MSG_REBIND
:
1532 if ((*ret
> 0) && !handled_status_codes
[code
])
1533 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1547 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1548 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1551 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1553 // Remove identical duid server candidate
1554 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1555 if (cand
->duid_len
== c
[i
].duid_len
&&
1556 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1559 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1564 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1565 i
< cand_len
/ sizeof(*c
); ++i
) {
1566 if (c
[i
].preference
< cand
->preference
)
1570 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1576 static void dhcpv6_clear_all_server_cand(void)
1579 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1581 // Server candidates need deep delete for IA_NA/IA_PD
1582 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1586 odhcp6c_clear_state(STATE_SERVER_CAND
);
1589 int dhcpv6_promote_server_cand(void)
1592 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1594 int ret
= DHCPV6_STATELESS
;
1596 // Clear lingering candidate state info
1597 odhcp6c_clear_state(STATE_SERVER_ID
);
1598 odhcp6c_clear_state(STATE_IA_NA
);
1599 odhcp6c_clear_state(STATE_IA_PD
);
1604 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1605 na_mode
= IA_MODE_NONE
;
1607 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1608 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1610 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1613 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1614 hdr
[1] = htons(cand
->duid_len
);
1615 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1616 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1617 accept_reconfig
= cand
->wants_reconfigure
;
1619 if (cand
->ia_na_len
) {
1620 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1622 if (na_mode
!= IA_MODE_NONE
)
1623 ret
= DHCPV6_STATEFUL
;
1626 if (cand
->ia_pd_len
) {
1627 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1629 if (pd_mode
!= IA_MODE_NONE
)
1630 ret
= DHCPV6_STATEFUL
;
1633 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1634 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1636 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));