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 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
));
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_UNICAST
),
187 htons(DHCPV6_OPT_SNTP_SERVERS
),
188 htons(DHCPV6_OPT_NTP_SERVER
),
189 htons(DHCPV6_OPT_AFTR_NAME
),
190 htons(DHCPV6_OPT_PD_EXCLUDE
),
191 htons(DHCPV6_OPT_SOL_MAX_RT
),
192 htons(DHCPV6_OPT_INF_MAX_RT
),
194 htons(DHCPV6_OPT_CER_ID
),
196 htons(DHCPV6_OPT_S46_CONT_MAPE
),
197 htons(DHCPV6_OPT_S46_CONT_MAPT
),
198 htons(DHCPV6_OPT_S46_CONT_LW
),
200 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
203 // Configure IPv6-options
205 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
206 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
207 setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
));
208 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
210 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
211 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
213 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
234 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
236 int mode
= DHCPV6_UNKNOWN
;
241 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
242 mode
= DHCPV6_STATELESS
;
243 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
244 mode
= DHCPV6_STATEFUL
;
249 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
253 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
260 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
261 sizeof(fqdn
.data
), NULL
, NULL
);
262 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
263 fqdn
.len
= htons(fqdn_len
- 4);
268 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
272 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
275 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
278 if (type
== DHCPV6_MSG_SOLICIT
) {
279 odhcp6c_clear_state(STATE_IA_PD
);
281 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
282 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
284 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
286 for (size_t i
= 0; i
< n_prefixes
; i
++) {
287 struct dhcpv6_ia_hdr hdr_ia_pd
= {
288 htons(DHCPV6_OPT_IA_PD
),
289 htons(sizeof(hdr_ia_pd
) - 4 +
290 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
291 request_prefixes
[i
].iaid
, 0, 0
293 struct dhcpv6_ia_prefix pref
= {
294 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
295 .len
= htons(sizeof(pref
) - 4),
296 .prefix
= request_prefixes
[i
].length
298 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
299 ia_pd_len
+= sizeof(hdr_ia_pd
);
300 if (request_prefixes
[i
].length
) {
301 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
302 ia_pd_len
+= sizeof(pref
);
306 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
307 ia_pd_entries
/= sizeof(*e
);
309 // we're too lazy to count our distinct IAIDs,
310 // so just allocate maximally needed space
311 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
312 sizeof(struct dhcpv6_ia_hdr
)));
314 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
315 uint32_t iaid
= e
[i
].iaid
;
317 // check if this is an unprocessed IAID and skip if not.
319 for (int j
= i
-1; j
>= 0; j
--) {
320 if (e
[j
].iaid
== iaid
) {
330 struct dhcpv6_ia_hdr hdr_ia_pd
= {
331 htons(DHCPV6_OPT_IA_PD
),
332 htons(sizeof(hdr_ia_pd
) - 4),
336 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
337 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
338 ia_pd_len
+= sizeof(hdr_ia_pd
);
340 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
341 if (e
[j
].iaid
!= iaid
)
345 if (e
[j
].priority
> 0)
346 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
348 struct dhcpv6_ia_prefix p
= {
349 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
350 .len
= htons(sizeof(p
) - 4U + ex_len
),
351 .prefix
= e
[j
].length
,
355 if (type
== DHCPV6_MSG_REQUEST
) {
356 p
.preferred
= htonl(e
[j
].preferred
);
357 p
.valid
= htonl(e
[j
].valid
);
360 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
361 ia_pd_len
+= sizeof(p
);
364 ia_pd
[ia_pd_len
++] = 0;
365 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
366 ia_pd
[ia_pd_len
++] = 0;
367 ia_pd
[ia_pd_len
++] = ex_len
- 4;
368 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
370 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
371 excl
>>= (64 - e
[j
].priority
);
372 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
374 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
375 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
376 ia_pd_len
+= ex_len
- 5;
379 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
384 if (ia_pd_entries
> 0)
388 size_t ia_na_entries
, ia_na_len
= 0;
390 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
391 ia_na_entries
/= sizeof(*e
);
393 struct dhcpv6_ia_hdr hdr_ia_na
= {
394 htons(DHCPV6_OPT_IA_NA
),
395 htons(sizeof(hdr_ia_na
) - 4),
399 struct dhcpv6_ia_addr pa
[ia_na_entries
];
400 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
401 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
402 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
403 pa
[i
].addr
= e
[i
].target
;
405 if (type
== DHCPV6_MSG_REQUEST
) {
406 pa
[i
].preferred
= htonl(e
[i
].preferred
);
407 pa
[i
].valid
= htonl(e
[i
].valid
);
415 ia_na_len
= sizeof(pa
);
416 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
418 // Reconfigure Accept
422 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
424 // Request Information Refresh
425 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
429 void *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
433 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
437 uint16_t elapsed_type
;
438 uint16_t elapsed_len
;
439 uint16_t elapsed_value
;
443 type
, {trid
[0], trid
[1], trid
[2]},
444 htons(DHCPV6_OPT_ELAPSED
), htons(2),
445 htons((ecs
> 0xffff) ? 0xffff : ecs
),
446 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
449 struct iovec iov
[IOV_TOTAL
] = {
450 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
451 [IOV_ORO
] = {oro
, oro_len
},
452 [IOV_ORO_REFRESH
] = {&oro_refresh
, 0},
453 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
454 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
455 [IOV_OPTS
] = { opts
, opts_len
},
456 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
457 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
458 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
459 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
460 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
463 size_t cnt
= IOV_TOTAL
;
464 if (type
== DHCPV6_MSG_INFO_REQ
) {
466 iov
[IOV_ORO_REFRESH
].iov_len
= sizeof(oro_refresh
);
467 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
468 } else if (!request_prefix
)
471 // Disable IAs if not used
472 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
473 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
475 if (na_mode
== IA_MODE_NONE
)
476 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
478 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
479 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
480 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
482 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
483 iov
[IOV_FQDN
].iov_len
= 0;
485 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
486 0, ALL_DHCPV6_RELAYS
, ifindex
};
487 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
488 .msg_iov
= iov
, .msg_iovlen
= cnt
};
491 case DHCPV6_MSG_REQUEST
:
492 case DHCPV6_MSG_RENEW
:
493 case DHCPV6_MSG_RELEASE
:
494 case DHCPV6_MSG_DECLINE
:
495 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr
) &&
496 odhcp6c_addr_in_scope(&server_addr
)) {
497 srv
.sin6_addr
= server_addr
;
498 if (!IN6_IS_ADDR_LINKLOCAL(&server_addr
))
499 srv
.sin6_scope_id
= 0;
506 if (sendmsg(sock
, &msg
, 0) < 0) {
507 char in6_str
[INET6_ADDRSTRLEN
];
509 syslog(LOG_ERR
, "Failed to send DHCPV6 message to %s (%s)",
510 inet_ntop(AF_INET6
, (const void *)&srv
.sin6_addr
,
511 in6_str
, sizeof(in6_str
)), strerror(errno
));
515 static int64_t dhcpv6_rand_delay(int64_t time
)
518 odhcp6c_random(&random
, sizeof(random
));
520 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
523 int dhcpv6_request(enum dhcpv6_msg type
)
526 uint64_t timeout
= UINT32_MAX
;
527 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
530 struct timespec ts
= {0, 0};
531 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
533 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
536 if (type
== DHCPV6_MSG_UNKNOWN
)
538 else if (type
== DHCPV6_MSG_RENEW
)
539 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
540 else if (type
== DHCPV6_MSG_REBIND
)
541 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
546 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %"PRIu64
"s, max rc %d)",
547 retx
->name
, timeout
, retx
->max_rc
);
549 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
551 // Generate transaction ID
552 uint8_t trid
[3] = {0, 0, 0};
553 if (type
!= DHCPV6_MSG_UNKNOWN
)
554 odhcp6c_random(trid
, sizeof(trid
));
561 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
563 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
564 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
565 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
567 rto
= (retx
->init_timeo
* 1000 + delay
);
569 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
571 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
572 rto
= retx
->max_timeo
* 1000 +
573 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
575 // Calculate end for this round and elapsed time
576 uint64_t round_end
= round_start
+ rto
;
577 elapsed
= round_start
- start
;
579 // Don't wait too long if timeout differs from infinite
580 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
581 round_end
= timeout
* 1000 + start
;
583 // Built and send package
585 case DHCPV6_MSG_UNKNOWN
:
588 syslog(LOG_NOTICE
, "Send %s message (elapsed %"PRIu64
"ms, rc %d)",
589 retx
->name
, elapsed
, rc
);
591 case DHCPV6_MSG_SOLICIT
:
592 case DHCPV6_MSG_INFO_REQ
:
593 dhcpv6_send(type
, trid
, elapsed
/ 10);
598 for (; len
< 0 && (round_start
< round_end
);
599 round_start
= odhcp6c_get_milli_time()) {
603 uint8_t buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
605 struct iovec iov
= {buf
, sizeof(buf
)};
606 struct sockaddr_in6 addr
;
607 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
608 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
.buf
,
609 .msg_controllen
= sizeof(cmsg_buf
)};
610 struct in6_pktinfo
*pktinfo
= NULL
;
612 // Check for pending signal
613 if (odhcp6c_signal_process())
616 // Set timeout for receiving
617 uint64_t t
= round_end
- round_start
;
618 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
619 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
623 len
= recvmsg(sock
, &msg
, 0);
627 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
628 ch
= CMSG_NXTHDR(&msg
, ch
)) {
629 if (ch
->cmsg_level
== SOL_IPV6
&&
630 ch
->cmsg_type
== IPV6_PKTINFO
) {
631 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
636 if (pktinfo
== NULL
) {
641 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
642 type
, &pktinfo
->ipi6_addr
)) {
647 uint8_t *opt
= &buf
[4];
648 uint8_t *opt_end
= opt
+ len
- 4;
650 round_start
= odhcp6c_get_milli_time();
651 elapsed
= round_start
- start
;
652 syslog(LOG_NOTICE
, "Got a valid reply after %"PRIu64
"ms",
655 if (retx
->handler_reply
)
656 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
658 if (len
> 0 && round_end
- round_start
> 1000)
659 round_end
= 1000 + round_start
;
663 if (retx
->handler_finish
)
664 len
= retx
->handler_finish();
665 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
666 (!retx
->max_rc
|| rc
< retx
->max_rc
));
670 // Message validation checks according to RFC3315 chapter 15
671 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
672 const uint8_t transaction
[3], enum dhcpv6_msg type
,
673 const struct in6_addr
*daddr
)
675 const struct dhcpv6_header
*rep
= buf
;
676 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
677 transaction
, sizeof(rep
->tr_id
)))
678 return false; // Invalid reply
680 if (type
== DHCPV6_MSG_SOLICIT
) {
681 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
682 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
685 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
686 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
689 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
)
692 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
693 rcmsg
= DHCPV6_MSG_UNKNOWN
;
694 uint16_t otype
, olen
= UINT16_MAX
;
695 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
696 ia_present
= false, options_valid
= true;
698 size_t client_id_len
, server_id_len
;
699 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
700 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
702 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
703 if (otype
== DHCPV6_OPT_CLIENTID
) {
704 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
705 &odata
[-4], client_id
, client_id_len
);
706 } else if (otype
== DHCPV6_OPT_SERVERID
) {
708 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
709 &odata
[-4], server_id
, server_id_len
);
712 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
713 sizeof(struct dhcpv6_auth_reconfigure
)) {
714 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
715 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
719 uint8_t serverhash
[16], secretbytes
[64];
721 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
722 memset(r
->key
, 0, sizeof(r
->key
));
724 memset(secretbytes
, 0, sizeof(secretbytes
));
725 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
727 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
728 secretbytes
[i
] ^= 0x36;
731 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
732 md5_hash(buf
, len
, &md5
);
735 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
736 secretbytes
[i
] ^= 0x36;
737 secretbytes
[i
] ^= 0x5c;
741 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
742 md5_hash(hash
, 16, &md5
);
745 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
746 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
748 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
750 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
751 options_valid
= false;
752 } else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
753 (otype
== DHCPV6_OPT_PD_EXCLUDE
))
754 // Options are not allowed on global level
755 options_valid
= false;
758 if (!options_valid
|| ((odata
+ olen
) > end
))
761 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
764 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
765 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_REBIND
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
766 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
767 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
771 return clientid_ok
&& serverid_ok
;
774 int dhcpv6_poll_reconfigure(void)
776 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
779 ret
= dhcpv6_request(ret
);
784 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig
, const int rc
,
785 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
787 uint16_t otype
, olen
;
791 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
792 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
794 case DHCPV6_MSG_REBIND
:
795 if (t2
!= UINT32_MAX
)
798 case DHCPV6_MSG_RENEW
:
799 if (t1
!= UINT32_MAX
)
802 case DHCPV6_MSG_INFO_REQ
:
812 dhcpv6_handle_reply(orig
, rc
, NULL
, NULL
, NULL
);
817 // Collect all advertised servers
818 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
819 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
821 uint16_t olen
, otype
;
822 uint8_t *odata
, pref
= 0;
823 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
824 IN6ADDR_ANY_INIT
, DHCPV6_SOL_MAX_RT
,
825 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
826 bool have_na
= false;
829 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
830 if (orig
== DHCPV6_MSG_SOLICIT
&&
831 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
832 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
833 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
834 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
837 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
838 memcpy(cand
.duid
, odata
, olen
);
839 cand
.duid_len
= olen
;
840 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
841 cand
.preference
>= 0) {
842 cand
.preference
= pref
= odata
[0];
843 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(cand
.server_addr
)) {
844 cand
.server_addr
= *(struct in6_addr
*)odata
;
845 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
846 cand
.wants_reconfigure
= true;
847 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
848 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
849 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
850 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
851 cand
.sol_max_rt
= sol_max_rt
;
853 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
854 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
855 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
856 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
857 cand
.inf_max_rt
= inf_max_rt
;
859 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
&&
860 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
861 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
862 uint8_t *oend
= odata
+ olen
, *d
;
863 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
864 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
865 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
866 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
870 } else if (otype
== DHCPV6_OPT_IA_NA
&&
871 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
872 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
873 uint8_t *oend
= odata
+ olen
, *d
;
875 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
876 if (otype
== DHCPV6_OPT_IA_ADDR
&&
877 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
883 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
884 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
886 * RFC7083 states to process the SOL_MAX_RT and
887 * INF_MAX_RT options even if the DHCPv6 server
888 * did not propose any IA_NA and/or IA_PD
890 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
891 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
895 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
896 cand
.has_noaddravail
= true;
897 cand
.preference
-= 1000;
900 if (pd_mode
!= IA_MODE_NONE
) {
902 cand
.preference
+= 2000 + (128 - have_pd
);
904 cand
.preference
-= 2000;
907 if (cand
.duid_len
> 0) {
908 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
909 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
910 dhcpv6_add_server_cand(&cand
);
913 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
916 static int dhcpv6_commit_advert(void)
918 return dhcpv6_promote_server_cand();
921 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
922 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
924 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
925 if (dhcpv6_commit_advert() < 0)
928 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
931 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
932 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
935 uint16_t otype
, olen
;
936 uint32_t refresh
= 86400;
938 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
942 if (orig
== DHCPV6_MSG_UNKNOWN
) {
943 static time_t last_update
= 0;
944 time_t now
= odhcp6c_get_milli_time() / 1000;
946 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
949 if (t1
!= UINT32_MAX
)
952 if (t2
!= UINT32_MAX
)
955 if (t3
!= UINT32_MAX
)
968 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
969 // Delete NA and PD we have in the state from the Advert
970 odhcp6c_clear_state(STATE_IA_NA
);
971 odhcp6c_clear_state(STATE_IA_PD
);
975 odhcp6c_clear_state(STATE_DNS
);
976 odhcp6c_clear_state(STATE_SEARCH
);
977 odhcp6c_clear_state(STATE_SNTP_IP
);
978 odhcp6c_clear_state(STATE_NTP_IP
);
979 odhcp6c_clear_state(STATE_NTP_FQDN
);
980 odhcp6c_clear_state(STATE_SIP_IP
);
981 odhcp6c_clear_state(STATE_SIP_FQDN
);
982 odhcp6c_clear_state(STATE_AFTR_NAME
);
983 odhcp6c_clear_state(STATE_CER
);
984 odhcp6c_clear_state(STATE_S46_MAPT
);
985 odhcp6c_clear_state(STATE_S46_MAPE
);
986 odhcp6c_clear_state(STATE_S46_LW
);
987 odhcp6c_clear_state(STATE_PASSTHRU
);
988 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
990 // Parse and find all matching IAs
991 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
992 struct odhcp6c_opt
*dopt
= odhcp6c_find_opt(otype
);
994 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
995 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
996 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
998 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
999 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
1003 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
1006 uint16_t code
= DHCPV6_Success
;
1007 uint16_t stype
, slen
;
1009 // Get and handle status code
1010 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
1011 stype
, slen
, sdata
) {
1012 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
1013 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
1014 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
1016 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
1018 if (code
== DHCPV6_Success
)
1021 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
1022 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1031 if (code
!= DHCPV6_Success
)
1034 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
);
1035 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(server_addr
))
1036 server_addr
= *(struct in6_addr
*)odata
;
1037 else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1038 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1039 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1040 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1042 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1043 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1045 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1046 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
)
1047 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1048 else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1050 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1051 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1052 uint16_t stype
, slen
;
1054 // Test status and bail if error
1055 dhcpv6_for_each_option(odata
, odata
+ olen
,
1056 stype
, slen
, sdata
) {
1057 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1058 stype
== NTP_SRV_ADDR
))
1059 odhcp6c_add_state(STATE_NTP_IP
,
1061 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1062 odhcp6c_add_state(STATE_NTP_FQDN
,
1065 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1067 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1068 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
)
1069 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1070 else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1071 refresh
= ntohl_unaligned(odata
);
1072 } else if (otype
== DHCPV6_OPT_AUTH
) {
1073 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1074 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1075 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1076 r
->reconf_type
== 1)
1077 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1079 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1081 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1083 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1084 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1085 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1086 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1087 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1088 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1089 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1090 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1091 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1092 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1093 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1095 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1096 sizeof(struct dhcpv6_cer_id
)) {
1097 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1098 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1099 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1100 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1102 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1103 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1104 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1106 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1108 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1109 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1110 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1112 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1114 if (!dopt
|| !(dopt
->flags
& OPT_NO_PASSTHRU
))
1115 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1120 case DHCPV6_MSG_REQUEST
:
1121 case DHCPV6_MSG_REBIND
:
1122 case DHCPV6_MSG_RENEW
:
1123 // Update refresh timers if no fatal status code was received
1124 if ((ret
> 0) && (ret
= dhcpv6_calc_refresh_timers())) {
1125 if (orig
== DHCPV6_MSG_REQUEST
) {
1126 // All server candidates can be cleared if not yet bound
1127 if (!odhcp6c_is_bound())
1128 dhcpv6_clear_all_server_cand();
1130 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1131 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1132 } else if (orig
== DHCPV6_MSG_RENEW
) {
1133 // Send further renews if T1 is not set
1137 } else if (orig
== DHCPV6_MSG_REBIND
) {
1138 // Send further rebinds if T1 and T2 is not set
1142 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1143 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1148 case DHCPV6_MSG_INFO_REQ
:
1150 // All server candidates can be cleared if not yet bound
1151 if (!odhcp6c_is_bound())
1152 dhcpv6_clear_all_server_cand();
1165 static int dhcpv6_parse_ia(void *opt
, void *end
)
1167 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1170 uint16_t otype
, olen
;
1173 t1
= ntohl(ia_hdr
->t1
);
1174 t2
= ntohl(ia_hdr
->t2
);
1179 // Update address IA
1180 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1181 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0, 0,
1182 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0};
1184 entry
.iaid
= ia_hdr
->iaid
;
1186 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1187 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1188 if (olen
+ 4U < sizeof(*prefix
))
1191 entry
.valid
= ntohl(prefix
->valid
);
1192 entry
.preferred
= ntohl(prefix
->preferred
);
1194 if (entry
.preferred
> entry
.valid
)
1197 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1198 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1199 if (entry
.t1
> entry
.t2
)
1200 entry
.t1
= entry
.t2
;
1202 entry
.length
= prefix
->prefix
;
1203 entry
.target
= prefix
->addr
;
1204 uint16_t stype
, slen
;
1209 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1210 odata
+ olen
, stype
, slen
, sdata
) {
1211 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1214 uint8_t elen
= sdata
[0];
1218 if (entry
.length
< 32 || elen
<= entry
.length
) {
1223 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1224 if (slen
<= bytes
) {
1229 uint32_t exclude
= 0;
1231 exclude
= exclude
<< 8 | sdata
[bytes
];
1234 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1235 exclude
<<= 64 - elen
;
1237 // Abusing router & priority fields for exclusion
1238 entry
.router
= entry
.target
;
1239 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1240 entry
.priority
= elen
;
1244 odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, 0);
1249 memset(&entry
.router
, 0, sizeof(entry
.router
));
1250 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1251 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1252 if (olen
+ 4U < sizeof(*addr
))
1255 entry
.preferred
= ntohl(addr
->preferred
);
1256 entry
.valid
= ntohl(addr
->valid
);
1258 if (entry
.preferred
> entry
.valid
)
1261 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1262 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1263 if (entry
.t1
> entry
.t2
)
1264 entry
.t1
= entry
.t2
;
1267 entry
.target
= addr
->addr
;
1269 odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, 0);
1276 static int dhcpv6_calc_refresh_timers(void)
1278 struct odhcp6c_entry
*e
;
1279 size_t ia_na_entries
, ia_pd_entries
, i
;
1280 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1282 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1283 ia_na_entries
/= sizeof(*e
);
1285 for (i
= 0; i
< ia_na_entries
; i
++) {
1292 if (e
[i
].valid
> l_t3
)
1296 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1297 ia_pd_entries
/= sizeof(*e
);
1299 for (i
= 0; i
< ia_pd_entries
; i
++) {
1306 if (e
[i
].valid
> l_t3
)
1310 if (ia_pd_entries
|| ia_na_entries
) {
1316 return (int)(ia_pd_entries
+ ia_na_entries
);
1319 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1320 const void *status_msg
, int len
)
1322 const char *src
= status_msg
;
1329 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1338 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1342 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1343 const uint16_t code
, const void *status_msg
, const int len
,
1346 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1349 case DHCPV6_UnspecFail
:
1354 case DHCPV6_UseMulticast
:
1356 case DHCPV6_MSG_REQUEST
:
1357 case DHCPV6_MSG_RENEW
:
1358 case DHCPV6_MSG_RELEASE
:
1359 case DHCPV6_MSG_DECLINE
:
1360 // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1361 server_addr
= in6addr_any
;
1369 case DHCPV6_NoAddrsAvail
:
1370 case DHCPV6_NoPrefixAvail
:
1371 if (orig
== DHCPV6_MSG_REQUEST
)
1372 *ret
= 0; // Failure
1380 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1381 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1382 const void *status_msg
, const int len
,
1383 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1385 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1386 "IA_NA" : "IA_PD", status_msg
, len
);
1389 case DHCPV6_NoBinding
:
1391 case DHCPV6_MSG_RENEW
:
1392 case DHCPV6_MSG_REBIND
:
1393 if ((*ret
> 0) && !handled_status_codes
[code
])
1394 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1408 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1409 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1412 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1414 // Remove identical duid server candidate
1415 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1416 if (cand
->duid_len
== c
[i
].duid_len
&&
1417 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1420 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1425 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1426 i
< cand_len
/ sizeof(*c
); ++i
) {
1427 if (c
[i
].preference
< cand
->preference
)
1431 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1437 static void dhcpv6_clear_all_server_cand(void)
1440 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1442 // Server candidates need deep delete for IA_NA/IA_PD
1443 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1447 odhcp6c_clear_state(STATE_SERVER_CAND
);
1450 int dhcpv6_promote_server_cand(void)
1453 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1455 int ret
= DHCPV6_STATELESS
;
1457 // Clear lingering candidate state info
1458 odhcp6c_clear_state(STATE_SERVER_ID
);
1459 odhcp6c_clear_state(STATE_IA_NA
);
1460 odhcp6c_clear_state(STATE_IA_PD
);
1465 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1466 na_mode
= IA_MODE_NONE
;
1468 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1469 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1471 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1474 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1475 hdr
[1] = htons(cand
->duid_len
);
1476 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1477 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1478 accept_reconfig
= cand
->wants_reconfigure
;
1480 if (cand
->ia_na_len
) {
1481 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1483 if (na_mode
!= IA_MODE_NONE
)
1484 ret
= DHCPV6_STATEFUL
;
1487 if (cand
->ia_pd_len
) {
1488 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1491 ret
= DHCPV6_STATEFUL
;
1494 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1495 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1497 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));