2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2017-2018 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
30 #include <sys/ioctl.h>
31 #include <sys/socket.h>
32 #include <arpa/inet.h>
33 #include <netinet/in.h>
36 #include <net/ethernet.h>
40 #include <libubox/md5.h>
46 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
47 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
48 #define DHCPV6_CLIENT_PORT 546
49 #define DHCPV6_SERVER_PORT 547
50 #define DHCPV6_DUID_LLADDR 3
51 #define DHCPV6_REQ_DELAY 1
53 #define DHCPV6_SOL_MAX_RT_MIN 60
54 #define DHCPV6_SOL_MAX_RT_MAX 86400
55 #define DHCPV6_INF_MAX_RT_MIN 60
56 #define DHCPV6_INF_MAX_RT_MAX 86400
58 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
59 const uint8_t transaction
[3], enum dhcpv6_msg type
,
60 const struct in6_addr
*daddr
);
62 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
);
64 static int dhcpv6_calc_refresh_timers(void);
65 static void dhcpv6_handle_status_code(_unused
const enum dhcpv6_msg orig
,
66 const uint16_t code
, const void *status_msg
, const int len
,
68 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
69 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
70 const void *status_msg
, const int len
,
71 bool handled_status_codes
[_DHCPV6_Status_Max
],
73 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
);
74 static void dhcpv6_clear_all_server_cand(void);
76 static reply_handler dhcpv6_handle_reply
;
77 static reply_handler dhcpv6_handle_advert
;
78 static reply_handler dhcpv6_handle_rebind_reply
;
79 static reply_handler dhcpv6_handle_reconfigure
;
80 static int dhcpv6_commit_advert(void);
82 // RFC 3315 - 5.5 Timeout and Delay values
83 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
84 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, 0, "<POLL>",
85 dhcpv6_handle_reconfigure
, NULL
},
86 [DHCPV6_MSG_SOLICIT
] = {true, 1, DHCPV6_SOL_MAX_RT
, 0, "SOLICIT",
87 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
88 [DHCPV6_MSG_REQUEST
] = {true, 1, DHCPV6_REQ_MAX_RT
, 10, "REQUEST",
89 dhcpv6_handle_reply
, NULL
},
90 [DHCPV6_MSG_RENEW
] = {false, 10, DHCPV6_REN_MAX_RT
, 0, "RENEW",
91 dhcpv6_handle_reply
, NULL
},
92 [DHCPV6_MSG_REBIND
] = {false, 10, DHCPV6_REB_MAX_RT
, 0, "REBIND",
93 dhcpv6_handle_rebind_reply
, NULL
},
94 [DHCPV6_MSG_RELEASE
] = {false, 1, 0, 5, "RELEASE", NULL
, NULL
},
95 [DHCPV6_MSG_DECLINE
] = {false, 1, 0, 5, "DECLINE", NULL
, NULL
},
96 [DHCPV6_MSG_INFO_REQ
] = {true, 1, DHCPV6_INF_MAX_RT
, 0, "INFOREQ",
97 dhcpv6_handle_reply
, NULL
},
101 static int sock
= -1;
102 static int ifindex
= -1;
103 static int64_t t1
= 0, t2
= 0, t3
= 0;
106 static 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 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
127 client_options
= options
;
128 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
130 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
136 memset(&ifr
, 0, sizeof(ifr
));
137 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
) - 1);
138 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
141 ifindex
= ifr
.ifr_ifindex
;
143 // Create client DUID
144 size_t client_id_len
;
145 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
146 if (client_id_len
== 0) {
147 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
148 DHCPV6_DUID_LLADDR
, 0, 1};
150 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
151 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
153 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
154 struct ifreq ifs
[100], *ifp
, *ifend
;
157 ifc
.ifc_len
= sizeof(ifs
);
159 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
160 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
161 // If our interface doesn't have an address...
162 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
163 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
164 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
165 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
166 sizeof(ifr
.ifr_name
));
167 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
170 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
175 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
179 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
181 htons(DHCPV6_OPT_SIP_SERVER_D
),
182 htons(DHCPV6_OPT_SIP_SERVER_A
),
183 htons(DHCPV6_OPT_DNS_SERVERS
),
184 htons(DHCPV6_OPT_DNS_DOMAIN
),
185 htons(DHCPV6_OPT_SNTP_SERVERS
),
186 htons(DHCPV6_OPT_NTP_SERVER
),
187 htons(DHCPV6_OPT_AFTR_NAME
),
188 htons(DHCPV6_OPT_PD_EXCLUDE
),
189 htons(DHCPV6_OPT_SOL_MAX_RT
),
190 htons(DHCPV6_OPT_INF_MAX_RT
),
192 htons(DHCPV6_OPT_CER_ID
),
194 htons(DHCPV6_OPT_S46_CONT_MAPE
),
195 htons(DHCPV6_OPT_S46_CONT_MAPT
),
196 htons(DHCPV6_OPT_S46_CONT_LW
),
198 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
201 uint16_t req_oro
[] = {
202 htons(DHCPV6_OPT_INF_MAX_RT
),
203 htons(DHCPV6_OPT_SOL_MAX_RT
),
204 htons(DHCPV6_OPT_INFO_REFRESH
),
206 odhcp6c_add_state(STATE_ORO
, req_oro
, sizeof(req_oro
));
208 // Configure IPv6-options
210 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
)) < 0)
213 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
)) < 0)
216 if (setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
)) < 0)
219 if (setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
)) < 0)
222 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
223 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
225 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
251 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
253 int mode
= DHCPV6_UNKNOWN
;
258 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
259 mode
= DHCPV6_STATELESS
;
260 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
261 mode
= DHCPV6_STATEFUL
;
266 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
270 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
277 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
278 sizeof(fqdn
.data
), NULL
, NULL
);
279 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
280 fqdn
.len
= htons(fqdn_len
- 4);
285 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
289 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
292 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
295 if (type
== DHCPV6_MSG_SOLICIT
) {
296 odhcp6c_clear_state(STATE_IA_PD
);
298 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
299 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
301 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
303 for (size_t i
= 0; i
< n_prefixes
; i
++) {
304 struct dhcpv6_ia_hdr hdr_ia_pd
= {
305 htons(DHCPV6_OPT_IA_PD
),
306 htons(sizeof(hdr_ia_pd
) - 4 +
307 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
308 request_prefixes
[i
].iaid
, 0, 0
310 struct dhcpv6_ia_prefix pref
= {
311 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
312 .len
= htons(sizeof(pref
) - 4),
313 .prefix
= request_prefixes
[i
].length
315 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
316 ia_pd_len
+= sizeof(hdr_ia_pd
);
317 if (request_prefixes
[i
].length
) {
318 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
319 ia_pd_len
+= sizeof(pref
);
323 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
324 ia_pd_entries
/= sizeof(*e
);
326 // we're too lazy to count our distinct IAIDs,
327 // so just allocate maximally needed space
328 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
329 sizeof(struct dhcpv6_ia_hdr
)));
331 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
332 uint32_t iaid
= e
[i
].iaid
;
334 // check if this is an unprocessed IAID and skip if not.
336 for (int j
= i
-1; j
>= 0; j
--) {
337 if (e
[j
].iaid
== iaid
) {
347 struct dhcpv6_ia_hdr hdr_ia_pd
= {
348 htons(DHCPV6_OPT_IA_PD
),
349 htons(sizeof(hdr_ia_pd
) - 4),
353 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
354 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
355 ia_pd_len
+= sizeof(hdr_ia_pd
);
357 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
358 if (e
[j
].iaid
!= iaid
)
362 if (e
[j
].priority
> 0)
363 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
365 struct dhcpv6_ia_prefix p
= {
366 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
367 .len
= htons(sizeof(p
) - 4U + ex_len
),
368 .prefix
= e
[j
].length
,
372 if (type
== DHCPV6_MSG_REQUEST
) {
373 p
.preferred
= htonl(e
[j
].preferred
);
374 p
.valid
= htonl(e
[j
].valid
);
377 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
378 ia_pd_len
+= sizeof(p
);
381 ia_pd
[ia_pd_len
++] = 0;
382 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
383 ia_pd
[ia_pd_len
++] = 0;
384 ia_pd
[ia_pd_len
++] = ex_len
- 4;
385 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
387 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
388 excl
>>= (64 - e
[j
].priority
);
389 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
391 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
392 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
393 ia_pd_len
+= ex_len
- 5;
396 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
402 size_t ia_na_entries
, ia_na_len
= 0;
404 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
405 ia_na_entries
/= sizeof(*e
);
407 struct dhcpv6_ia_hdr hdr_ia_na
= {
408 htons(DHCPV6_OPT_IA_NA
),
409 htons(sizeof(hdr_ia_na
) - 4),
413 struct dhcpv6_ia_addr pa
[ia_na_entries
];
414 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
415 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
416 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
417 pa
[i
].addr
= e
[i
].target
;
419 if (type
== DHCPV6_MSG_REQUEST
) {
420 pa
[i
].preferred
= htonl(e
[i
].preferred
);
421 pa
[i
].valid
= htonl(e
[i
].valid
);
429 ia_na_len
= sizeof(pa
);
430 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
432 // Reconfigure Accept
436 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
440 void *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
442 // Option Request List
443 size_t oro_entries
, oro_len
= 0;
444 uint16_t *oro
, *s_oro
= odhcp6c_get_state(STATE_ORO
, &oro_entries
);
446 oro_entries
/= sizeof(*s_oro
);
447 oro
= alloca(oro_entries
* sizeof(*oro
));
449 for (size_t i
= 0; i
< oro_entries
; i
++) {
450 struct odhcp6c_opt
*opt
= odhcp6c_find_opt(htons(s_oro
[i
]));
453 if (!(opt
->flags
& OPT_ORO
))
456 if ((opt
->flags
& OPT_ORO_SOLICIT
) && type
!= DHCPV6_MSG_SOLICIT
)
459 if ((opt
->flags
& OPT_ORO_STATELESS
) && type
!= DHCPV6_MSG_INFO_REQ
)
462 if ((opt
->flags
& OPT_ORO_STATEFUL
) && type
== DHCPV6_MSG_INFO_REQ
)
466 oro
[oro_len
++] = s_oro
[i
];
468 oro_len
*= sizeof(*oro
);
474 uint16_t elapsed_type
;
475 uint16_t elapsed_len
;
476 uint16_t elapsed_value
;
480 type
, {trid
[0], trid
[1], trid
[2]},
481 htons(DHCPV6_OPT_ELAPSED
), htons(2),
482 htons((ecs
> 0xffff) ? 0xffff : ecs
),
483 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
486 struct iovec iov
[IOV_TOTAL
] = {
487 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
488 [IOV_ORO
] = {oro
, oro_len
},
489 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
490 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
491 [IOV_OPTS
] = { opts
, opts_len
},
492 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
493 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
494 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
495 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
496 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
499 size_t cnt
= IOV_TOTAL
;
500 if (type
== DHCPV6_MSG_INFO_REQ
)
503 // Disable IAs if not used
504 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
505 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
507 if (na_mode
== IA_MODE_NONE
)
508 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
510 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
511 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
512 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
514 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
515 iov
[IOV_FQDN
].iov_len
= 0;
517 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
518 0, ALL_DHCPV6_RELAYS
, ifindex
};
519 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
520 .msg_iov
= iov
, .msg_iovlen
= cnt
};
523 case DHCPV6_MSG_REQUEST
:
524 case DHCPV6_MSG_RENEW
:
525 case DHCPV6_MSG_RELEASE
:
526 case DHCPV6_MSG_DECLINE
:
527 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr
) &&
528 odhcp6c_addr_in_scope(&server_addr
)) {
529 srv
.sin6_addr
= server_addr
;
530 if (!IN6_IS_ADDR_LINKLOCAL(&server_addr
))
531 srv
.sin6_scope_id
= 0;
538 if (sendmsg(sock
, &msg
, 0) < 0) {
539 char in6_str
[INET6_ADDRSTRLEN
];
541 syslog(LOG_ERR
, "Failed to send DHCPV6 message to %s (%s)",
542 inet_ntop(AF_INET6
, (const void *)&srv
.sin6_addr
,
543 in6_str
, sizeof(in6_str
)), strerror(errno
));
547 static int64_t dhcpv6_rand_delay(int64_t time
)
550 odhcp6c_random(&random
, sizeof(random
));
552 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
555 int dhcpv6_request(enum dhcpv6_msg type
)
558 uint64_t timeout
= UINT32_MAX
;
559 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
562 struct timespec ts
= {0, 0};
563 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
565 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
568 if (type
== DHCPV6_MSG_UNKNOWN
)
570 else if (type
== DHCPV6_MSG_RENEW
)
571 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
572 else if (type
== DHCPV6_MSG_REBIND
)
573 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
578 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %"PRIu64
"s, max rc %d)",
579 retx
->name
, timeout
, retx
->max_rc
);
581 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
583 // Generate transaction ID
584 uint8_t trid
[3] = {0, 0, 0};
585 if (type
!= DHCPV6_MSG_UNKNOWN
)
586 odhcp6c_random(trid
, sizeof(trid
));
593 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
595 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
596 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
597 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
599 rto
= (retx
->init_timeo
* 1000 + delay
);
601 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
603 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
604 rto
= retx
->max_timeo
* 1000 +
605 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
607 // Calculate end for this round and elapsed time
608 uint64_t round_end
= round_start
+ rto
;
609 elapsed
= round_start
- start
;
611 // Don't wait too long if timeout differs from infinite
612 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
613 round_end
= timeout
* 1000 + start
;
615 // Built and send package
617 case DHCPV6_MSG_UNKNOWN
:
620 syslog(LOG_NOTICE
, "Send %s message (elapsed %"PRIu64
"ms, rc %d)",
621 retx
->name
, elapsed
, rc
);
623 case DHCPV6_MSG_SOLICIT
:
624 case DHCPV6_MSG_INFO_REQ
:
625 dhcpv6_send(type
, trid
, elapsed
/ 10);
630 for (; len
< 0 && (round_start
< round_end
);
631 round_start
= odhcp6c_get_milli_time()) {
635 uint8_t buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
637 struct iovec iov
= {buf
, sizeof(buf
)};
638 struct sockaddr_in6 addr
;
639 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
640 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
.buf
,
641 .msg_controllen
= sizeof(cmsg_buf
)};
642 struct in6_pktinfo
*pktinfo
= NULL
;
644 // Check for pending signal
645 if (odhcp6c_signal_process())
648 // Set timeout for receiving
649 uint64_t t
= round_end
- round_start
;
650 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
651 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
652 &tv
, sizeof(tv
)) < 0)
653 syslog(LOG_ERR
, "setsockopt SO_RCVTIMEO failed (%s)",
657 len
= recvmsg(sock
, &msg
, 0);
661 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
662 ch
= CMSG_NXTHDR(&msg
, ch
)) {
663 if (ch
->cmsg_level
== SOL_IPV6
&&
664 ch
->cmsg_type
== IPV6_PKTINFO
) {
665 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
670 if (pktinfo
== NULL
) {
675 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
676 type
, &pktinfo
->ipi6_addr
)) {
681 uint8_t *opt
= &buf
[4];
682 uint8_t *opt_end
= opt
+ len
- 4;
684 round_start
= odhcp6c_get_milli_time();
685 elapsed
= round_start
- start
;
686 syslog(LOG_NOTICE
, "Got a valid reply after %"PRIu64
"ms",
689 if (retx
->handler_reply
)
690 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
692 if (len
> 0 && round_end
- round_start
> 1000)
693 round_end
= 1000 + round_start
;
697 if (retx
->handler_finish
)
698 len
= retx
->handler_finish();
699 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
700 (!retx
->max_rc
|| rc
< retx
->max_rc
));
704 // Message validation checks according to RFC3315 chapter 15
705 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
706 const uint8_t transaction
[3], enum dhcpv6_msg type
,
707 const struct in6_addr
*daddr
)
709 const struct dhcpv6_header
*rep
= buf
;
710 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
711 transaction
, sizeof(rep
->tr_id
)))
712 return false; // Invalid reply
714 if (type
== DHCPV6_MSG_SOLICIT
) {
715 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
716 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
719 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
720 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
723 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
)
726 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
727 rcmsg
= DHCPV6_MSG_UNKNOWN
;
728 uint16_t otype
, olen
= UINT16_MAX
;
729 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
730 ia_present
= false, options_valid
= true;
732 size_t client_id_len
, server_id_len
;
733 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
734 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
736 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
737 if (otype
== DHCPV6_OPT_CLIENTID
) {
738 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
739 &odata
[-4], client_id
, client_id_len
);
740 } else if (otype
== DHCPV6_OPT_SERVERID
) {
742 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
743 &odata
[-4], server_id
, server_id_len
);
746 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
747 sizeof(struct dhcpv6_auth_reconfigure
)) {
748 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
749 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
753 uint8_t serverhash
[16], secretbytes
[64];
755 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
756 memset(r
->key
, 0, sizeof(r
->key
));
758 memset(secretbytes
, 0, sizeof(secretbytes
));
759 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
761 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
762 secretbytes
[i
] ^= 0x36;
765 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
766 md5_hash(buf
, len
, &md5
);
769 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
770 secretbytes
[i
] ^= 0x36;
771 secretbytes
[i
] ^= 0x5c;
775 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
776 md5_hash(hash
, 16, &md5
);
779 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
780 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
782 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
784 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
785 options_valid
= false;
786 } else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
787 (otype
== DHCPV6_OPT_PD_EXCLUDE
))
788 // Options are not allowed on global level
789 options_valid
= false;
792 if (!options_valid
|| ((odata
+ olen
) > end
))
795 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
798 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
799 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_REBIND
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
800 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
801 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
805 return clientid_ok
&& serverid_ok
;
808 int dhcpv6_poll_reconfigure(void)
810 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
813 ret
= dhcpv6_request(ret
);
818 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig
, const int rc
,
819 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
821 uint16_t otype
, olen
;
825 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
826 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
828 case DHCPV6_MSG_REBIND
:
829 if (t2
!= UINT32_MAX
)
832 case DHCPV6_MSG_RENEW
:
833 if (t1
!= UINT32_MAX
)
836 case DHCPV6_MSG_INFO_REQ
:
846 dhcpv6_handle_reply(orig
, rc
, NULL
, NULL
, NULL
);
851 // Collect all advertised servers
852 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
853 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
855 uint16_t olen
, otype
;
856 uint8_t *odata
, pref
= 0;
857 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
858 IN6ADDR_ANY_INIT
, DHCPV6_SOL_MAX_RT
,
859 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
860 bool have_na
= false;
863 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
864 if (orig
== DHCPV6_MSG_SOLICIT
&&
865 ((otype
== DHCPV6_OPT_IA_PD
&& pd_mode
!= IA_MODE_NONE
) ||
866 (otype
== DHCPV6_OPT_IA_NA
&& na_mode
!= IA_MODE_NONE
)) &&
867 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
868 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
869 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
872 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
873 memcpy(cand
.duid
, odata
, olen
);
874 cand
.duid_len
= olen
;
875 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
876 cand
.preference
>= 0) {
877 cand
.preference
= pref
= odata
[0];
878 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(cand
.server_addr
)) {
879 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
880 cand
.server_addr
= *(struct in6_addr
*)odata
;
882 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
883 cand
.wants_reconfigure
= true;
884 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
885 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
886 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
887 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
888 cand
.sol_max_rt
= sol_max_rt
;
890 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
891 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
892 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
893 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
894 cand
.inf_max_rt
= inf_max_rt
;
896 } else if (otype
== DHCPV6_OPT_IA_PD
&&
897 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
898 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
899 uint8_t *oend
= odata
+ olen
, *d
;
900 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
901 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
902 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
903 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
907 } else if (otype
== DHCPV6_OPT_IA_NA
&&
908 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
909 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
910 uint8_t *oend
= odata
+ olen
, *d
;
912 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
913 if (otype
== DHCPV6_OPT_IA_ADDR
&&
914 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
920 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
921 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
923 * RFC7083 states to process the SOL_MAX_RT and
924 * INF_MAX_RT options even if the DHCPv6 server
925 * did not propose any IA_NA and/or IA_PD
927 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
928 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
932 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
933 cand
.has_noaddravail
= true;
934 cand
.preference
-= 1000;
937 if (pd_mode
!= IA_MODE_NONE
) {
939 cand
.preference
+= 2000 + (128 - have_pd
);
941 cand
.preference
-= 2000;
944 if (cand
.duid_len
> 0) {
945 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
946 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
947 dhcpv6_add_server_cand(&cand
);
950 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
953 static int dhcpv6_commit_advert(void)
955 return dhcpv6_promote_server_cand();
958 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
959 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
961 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
962 if (dhcpv6_commit_advert() < 0)
965 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
968 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
969 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
972 uint16_t otype
, olen
;
973 uint32_t refresh
= 86400;
975 unsigned int updated_IAs
= 0;
976 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
980 if (orig
== DHCPV6_MSG_UNKNOWN
) {
981 static time_t last_update
= 0;
982 time_t now
= odhcp6c_get_milli_time() / 1000;
984 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
987 if (t1
!= UINT32_MAX
)
990 if (t2
!= UINT32_MAX
)
993 if (t3
!= UINT32_MAX
)
1006 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
1007 // Delete NA and PD we have in the state from the Advert
1008 odhcp6c_clear_state(STATE_IA_NA
);
1009 odhcp6c_clear_state(STATE_IA_PD
);
1013 odhcp6c_clear_state(STATE_DNS
);
1014 odhcp6c_clear_state(STATE_SEARCH
);
1015 odhcp6c_clear_state(STATE_SNTP_IP
);
1016 odhcp6c_clear_state(STATE_NTP_IP
);
1017 odhcp6c_clear_state(STATE_NTP_FQDN
);
1018 odhcp6c_clear_state(STATE_SIP_IP
);
1019 odhcp6c_clear_state(STATE_SIP_FQDN
);
1020 odhcp6c_clear_state(STATE_AFTR_NAME
);
1021 odhcp6c_clear_state(STATE_CER
);
1022 odhcp6c_clear_state(STATE_S46_MAPT
);
1023 odhcp6c_clear_state(STATE_S46_MAPE
);
1024 odhcp6c_clear_state(STATE_S46_LW
);
1025 odhcp6c_clear_state(STATE_PASSTHRU
);
1026 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
1028 // Parse and find all matching IAs
1029 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
1030 struct odhcp6c_opt
*dopt
= odhcp6c_find_opt(otype
);
1032 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
1033 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
1034 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
1036 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
1037 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
1041 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
1044 uint16_t code
= DHCPV6_Success
;
1045 uint16_t stype
, slen
;
1047 // Get and handle status code
1048 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
1049 stype
, slen
, sdata
) {
1050 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
1051 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
1052 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
1054 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
1056 if (code
== DHCPV6_Success
)
1059 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
1060 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1069 if (code
!= DHCPV6_Success
)
1072 updated_IAs
+= dhcpv6_parse_ia(ia_hdr
, odata
+ olen
);
1073 } else if (otype
== DHCPV6_OPT_UNICAST
&& olen
== sizeof(server_addr
)) {
1074 if (!(client_options
& DHCPV6_IGNORE_OPT_UNICAST
))
1075 server_addr
= *(struct in6_addr
*)odata
;
1078 else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1079 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1080 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1081 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1083 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1084 } else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1086 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1087 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
)
1088 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1089 else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1091 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1092 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1093 uint16_t stype
, slen
;
1095 // Test status and bail if error
1096 dhcpv6_for_each_option(odata
, odata
+ olen
,
1097 stype
, slen
, sdata
) {
1098 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1099 stype
== NTP_SRV_ADDR
))
1100 odhcp6c_add_state(STATE_NTP_IP
,
1102 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1103 odhcp6c_add_state(STATE_NTP_FQDN
,
1106 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1108 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1109 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
)
1110 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1111 else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1112 refresh
= ntohl_unaligned(odata
);
1113 } else if (otype
== DHCPV6_OPT_AUTH
) {
1114 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1115 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1116 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1117 r
->reconf_type
== 1)
1118 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1120 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1122 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1124 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1125 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1126 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1127 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1128 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1129 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1130 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1131 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1132 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1133 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1134 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1136 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1137 sizeof(struct dhcpv6_cer_id
)) {
1138 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1139 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1140 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1141 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1143 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1144 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1145 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1147 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1149 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1150 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1151 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1153 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1155 if (!dopt
|| !(dopt
->flags
& OPT_NO_PASSTHRU
))
1156 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1161 case DHCPV6_MSG_REQUEST
:
1162 case DHCPV6_MSG_REBIND
:
1163 case DHCPV6_MSG_RENEW
:
1164 // Update refresh timers if no fatal status code was received
1165 if ((ret
> 0) && (ret
= dhcpv6_calc_refresh_timers())) {
1166 if (orig
== DHCPV6_MSG_REQUEST
) {
1167 // All server candidates can be cleared if not yet bound
1168 if (!odhcp6c_is_bound())
1169 dhcpv6_clear_all_server_cand();
1171 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1172 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1173 } else if (orig
== DHCPV6_MSG_RENEW
) {
1174 // Send further renews if T1 is not set and
1179 else if ((t2
- t1
) > 1)
1180 // Grace period of 1 second
1184 } else if (orig
== DHCPV6_MSG_REBIND
) {
1185 // Send further rebinds if T1 and T2 is not set and
1190 else if ((t3
- t2
) > 1)
1191 // Grace period of 1 second
1195 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1196 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1201 case DHCPV6_MSG_INFO_REQ
:
1203 // All server candidates can be cleared if not yet bound
1204 if (!odhcp6c_is_bound())
1205 dhcpv6_clear_all_server_cand();
1218 static unsigned int dhcpv6_parse_ia(void *opt
, void *end
)
1220 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1221 unsigned int updated_IAs
= 0;
1223 uint16_t otype
, olen
;
1226 t1
= ntohl(ia_hdr
->t1
);
1227 t2
= ntohl(ia_hdr
->t2
);
1232 // Update address IA
1233 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1234 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0, 0,
1235 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0};
1237 entry
.iaid
= ia_hdr
->iaid
;
1239 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1240 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1241 if (olen
+ 4U < sizeof(*prefix
))
1244 entry
.valid
= ntohl(prefix
->valid
);
1245 entry
.preferred
= ntohl(prefix
->preferred
);
1247 if (entry
.preferred
> entry
.valid
)
1250 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1251 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1252 if (entry
.t1
> entry
.t2
)
1253 entry
.t1
= entry
.t2
;
1255 entry
.length
= prefix
->prefix
;
1256 entry
.target
= prefix
->addr
;
1257 uint16_t stype
, slen
;
1262 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1263 odata
+ olen
, stype
, slen
, sdata
) {
1264 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1267 uint8_t elen
= sdata
[0];
1271 if (entry
.length
< 32 || elen
<= entry
.length
) {
1276 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1277 if (slen
<= bytes
) {
1282 uint32_t exclude
= 0;
1284 exclude
= exclude
<< 8 | sdata
[bytes
];
1287 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1288 exclude
<<= 64 - elen
;
1290 // Abusing router & priority fields for exclusion
1291 entry
.router
= entry
.target
;
1292 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1293 entry
.priority
= elen
;
1297 if (odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, 0))
1302 memset(&entry
.router
, 0, sizeof(entry
.router
));
1303 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1304 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1305 if (olen
+ 4U < sizeof(*addr
))
1308 entry
.preferred
= ntohl(addr
->preferred
);
1309 entry
.valid
= ntohl(addr
->valid
);
1311 if (entry
.preferred
> entry
.valid
)
1314 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1315 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1316 if (entry
.t1
> entry
.t2
)
1317 entry
.t1
= entry
.t2
;
1320 entry
.target
= addr
->addr
;
1322 if (odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, 0))
1329 static int dhcpv6_calc_refresh_timers(void)
1331 struct odhcp6c_entry
*e
;
1332 size_t ia_na_entries
, ia_pd_entries
, i
;
1333 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1335 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1336 ia_na_entries
/= sizeof(*e
);
1338 for (i
= 0; i
< ia_na_entries
; i
++) {
1345 if (e
[i
].valid
> l_t3
)
1349 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1350 ia_pd_entries
/= sizeof(*e
);
1352 for (i
= 0; i
< ia_pd_entries
; i
++) {
1359 if (e
[i
].valid
> l_t3
)
1363 if (ia_pd_entries
|| ia_na_entries
) {
1369 return (int)(ia_pd_entries
+ ia_na_entries
);
1372 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1373 const void *status_msg
, int len
)
1375 const char *src
= status_msg
;
1382 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1391 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1395 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1396 const uint16_t code
, const void *status_msg
, const int len
,
1399 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1402 case DHCPV6_UnspecFail
:
1407 case DHCPV6_UseMulticast
:
1409 case DHCPV6_MSG_REQUEST
:
1410 case DHCPV6_MSG_RENEW
:
1411 case DHCPV6_MSG_RELEASE
:
1412 case DHCPV6_MSG_DECLINE
:
1413 // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1414 server_addr
= in6addr_any
;
1422 case DHCPV6_NoAddrsAvail
:
1423 case DHCPV6_NoPrefixAvail
:
1424 if (orig
== DHCPV6_MSG_REQUEST
)
1425 *ret
= 0; // Failure
1433 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1434 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1435 const void *status_msg
, const int len
,
1436 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1438 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1439 "IA_NA" : "IA_PD", status_msg
, len
);
1442 case DHCPV6_NoBinding
:
1444 case DHCPV6_MSG_RENEW
:
1445 case DHCPV6_MSG_REBIND
:
1446 if ((*ret
> 0) && !handled_status_codes
[code
])
1447 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1461 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1462 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1465 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1467 // Remove identical duid server candidate
1468 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1469 if (cand
->duid_len
== c
[i
].duid_len
&&
1470 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1473 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1478 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1479 i
< cand_len
/ sizeof(*c
); ++i
) {
1480 if (c
[i
].preference
< cand
->preference
)
1484 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1490 static void dhcpv6_clear_all_server_cand(void)
1493 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1495 // Server candidates need deep delete for IA_NA/IA_PD
1496 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1500 odhcp6c_clear_state(STATE_SERVER_CAND
);
1503 int dhcpv6_promote_server_cand(void)
1506 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1508 int ret
= DHCPV6_STATELESS
;
1510 // Clear lingering candidate state info
1511 odhcp6c_clear_state(STATE_SERVER_ID
);
1512 odhcp6c_clear_state(STATE_IA_NA
);
1513 odhcp6c_clear_state(STATE_IA_PD
);
1518 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1519 na_mode
= IA_MODE_NONE
;
1521 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1522 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1524 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1527 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1528 hdr
[1] = htons(cand
->duid_len
);
1529 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1530 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1531 accept_reconfig
= cand
->wants_reconfigure
;
1533 if (cand
->ia_na_len
) {
1534 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1536 if (na_mode
!= IA_MODE_NONE
)
1537 ret
= DHCPV6_STATEFUL
;
1540 if (cand
->ia_pd_len
) {
1541 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1543 if (pd_mode
!= IA_MODE_NONE
)
1544 ret
= DHCPV6_STATEFUL
;
1547 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1548 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1550 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));