2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
32 #include <net/ethernet.h>
38 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
39 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
40 #define DHCPV6_CLIENT_PORT 546
41 #define DHCPV6_SERVER_PORT 547
42 #define DHCPV6_DUID_LLADDR 3
43 #define DHCPV6_REQ_DELAY 1
45 #define DHCPV6_SOL_MAX_RT_MIN 60
46 #define DHCPV6_SOL_MAX_RT_MAX 86400
47 #define DHCPV6_INF_MAX_RT_MIN 60
48 #define DHCPV6_INF_MAX_RT_MAX 86400
50 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
51 const uint8_t transaction
[3], enum dhcpv6_msg type
,
52 const struct in6_addr
*daddr
);
54 static int dhcpv6_parse_ia(void *opt
, void *end
);
56 static int dhcpv6_calc_refresh_timers(void);
57 static void dhcpv6_handle_status_code(_unused
const enum dhcpv6_msg orig
,
58 const uint16_t code
, const void *status_msg
, const int len
,
60 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
61 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
62 const void *status_msg
, const int len
,
63 bool handled_status_codes
[_DHCPV6_Status_Max
],
65 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
);
66 static void dhcpv6_clear_all_server_cand(void);
68 static reply_handler dhcpv6_handle_reply
;
69 static reply_handler dhcpv6_handle_advert
;
70 static reply_handler dhcpv6_handle_rebind_reply
;
71 static reply_handler dhcpv6_handle_reconfigure
;
72 static int dhcpv6_commit_advert(void);
76 // RFC 3315 - 5.5 Timeout and Delay values
77 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
78 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, 0, "<POLL>",
79 dhcpv6_handle_reconfigure
, NULL
},
80 [DHCPV6_MSG_SOLICIT
] = {true, 1, DHCPV6_SOL_MAX_RT
, 0, "SOLICIT",
81 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
82 [DHCPV6_MSG_REQUEST
] = {true, 1, DHCPV6_REQ_MAX_RT
, 10, "REQUEST",
83 dhcpv6_handle_reply
, NULL
},
84 [DHCPV6_MSG_RENEW
] = {false, 10, DHCPV6_REN_MAX_RT
, 0, "RENEW",
85 dhcpv6_handle_reply
, NULL
},
86 [DHCPV6_MSG_REBIND
] = {false, 10, DHCPV6_REB_MAX_RT
, 0, "REBIND",
87 dhcpv6_handle_rebind_reply
, NULL
},
88 [DHCPV6_MSG_RELEASE
] = {false, 1, 0, 5, "RELEASE", NULL
, NULL
},
89 [DHCPV6_MSG_DECLINE
] = {false, 1, 0, 5, "DECLINE", NULL
, NULL
},
90 [DHCPV6_MSG_INFO_REQ
] = {true, 1, DHCPV6_INF_MAX_RT
, 0, "INFOREQ",
91 dhcpv6_handle_reply
, NULL
},
97 static int ifindex
= -1;
98 static int64_t t1
= 0, t2
= 0, t3
= 0;
101 static int request_prefix
= -1;
102 static enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
, pd_mode
= IA_MODE_NONE
;
103 static bool accept_reconfig
= false;
106 static uint8_t reconf_key
[16];
109 static unsigned int client_options
= 0;
112 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
114 client_options
= options
;
115 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
117 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
123 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
124 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
126 ifindex
= ifr
.ifr_ifindex
;
128 // Create client DUID
129 size_t client_id_len
;
130 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
131 if (client_id_len
== 0) {
132 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
133 DHCPV6_DUID_LLADDR
, 0, 1};
135 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
136 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
138 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
139 struct ifreq ifs
[100], *ifp
, *ifend
;
142 ifc
.ifc_len
= sizeof(ifs
);
144 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
145 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
146 // If our interface doesn't have an address...
147 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
148 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
149 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
150 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
151 sizeof(ifr
.ifr_name
));
152 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
155 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
160 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
164 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
166 htons(DHCPV6_OPT_SIP_SERVER_D
),
167 htons(DHCPV6_OPT_SIP_SERVER_A
),
168 htons(DHCPV6_OPT_DNS_SERVERS
),
169 htons(DHCPV6_OPT_DNS_DOMAIN
),
170 htons(DHCPV6_OPT_SNTP_SERVERS
),
171 htons(DHCPV6_OPT_NTP_SERVER
),
172 htons(DHCPV6_OPT_AFTR_NAME
),
173 htons(DHCPV6_OPT_PD_EXCLUDE
),
174 htons(DHCPV6_OPT_SOL_MAX_RT
),
175 htons(DHCPV6_OPT_INF_MAX_RT
),
176 #ifdef EXT_PREFIX_CLASS
177 htons(DHCPV6_OPT_PREFIX_CLASS
),
180 htons(DHCPV6_OPT_CER_ID
),
182 htons(DHCPV6_OPT_S46_CONT_MAPE
),
183 htons(DHCPV6_OPT_S46_CONT_MAPT
),
184 htons(DHCPV6_OPT_S46_CONT_LW
),
186 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
189 // Configure IPv6-options
191 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
192 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
193 setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
));
194 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
196 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
197 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
198 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
210 IOV_VENDOR_CLASS_HDR
,
222 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
228 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
232 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
239 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
240 sizeof(fqdn
.data
), NULL
, NULL
);
241 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
242 fqdn
.len
= htons(fqdn_len
- 4);
248 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
252 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
255 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
258 if (type
== DHCPV6_MSG_SOLICIT
) {
259 odhcp6c_clear_state(STATE_IA_PD
);
261 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
262 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
264 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
266 for (size_t i
= 0; i
< n_prefixes
; i
++) {
267 struct dhcpv6_ia_hdr hdr_ia_pd
= {
268 htons(DHCPV6_OPT_IA_PD
),
269 htons(sizeof(hdr_ia_pd
) - 4 + sizeof(struct dhcpv6_ia_prefix
)),
270 request_prefixes
[i
].iaid
, 0, 0
272 struct dhcpv6_ia_prefix pref
= {
273 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
274 .len
= htons(25), .prefix
= request_prefixes
[i
].length
276 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
277 ia_pd_len
+= sizeof(hdr_ia_pd
);
278 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
279 ia_pd_len
+= sizeof(pref
);
282 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
283 ia_pd_entries
/= sizeof(*e
);
285 // we're too lazy to count our distinct IAIDs,
286 // so just allocate maximally needed space
287 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
288 sizeof(struct dhcpv6_ia_hdr
)));
290 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
291 uint32_t iaid
= e
[i
].iaid
;
293 // check if this is an unprocessed IAID and skip if not.
295 for (int j
= i
-1; j
>= 0; j
--) {
296 if (e
[j
].iaid
== iaid
) {
306 struct dhcpv6_ia_hdr hdr_ia_pd
= {
307 htons(DHCPV6_OPT_IA_PD
),
308 htons(sizeof(hdr_ia_pd
) - 4),
312 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
313 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
314 ia_pd_len
+= sizeof(hdr_ia_pd
);
316 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
317 if (e
[j
].iaid
!= iaid
)
321 if (e
[j
].priority
> 0)
322 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
324 struct dhcpv6_ia_prefix p
= {
325 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
326 .len
= htons(sizeof(p
) - 4U + ex_len
),
327 .prefix
= e
[j
].length
,
331 if (type
== DHCPV6_MSG_REQUEST
) {
332 p
.preferred
= htonl(e
[j
].preferred
);
333 p
.valid
= htonl(e
[j
].valid
);
336 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
337 ia_pd_len
+= sizeof(p
);
340 ia_pd
[ia_pd_len
++] = 0;
341 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
342 ia_pd
[ia_pd_len
++] = 0;
343 ia_pd
[ia_pd_len
++] = ex_len
- 4;
344 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
346 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
347 excl
>>= (64 - e
[j
].priority
);
348 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
350 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
351 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
352 ia_pd_len
+= ex_len
- 5;
355 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
360 if (ia_pd_entries
> 0)
364 size_t ia_na_entries
, ia_na_len
= 0;
366 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
367 ia_na_entries
/= sizeof(*e
);
369 struct dhcpv6_ia_hdr hdr_ia_na
= {
370 htons(DHCPV6_OPT_IA_NA
),
371 htons(sizeof(hdr_ia_na
) - 4),
375 struct dhcpv6_ia_addr pa
[ia_na_entries
];
376 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
377 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
378 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
379 pa
[i
].addr
= e
[i
].target
;
381 if (type
== DHCPV6_MSG_REQUEST
) {
382 pa
[i
].preferred
= htonl(e
[i
].preferred
);
383 pa
[i
].valid
= htonl(e
[i
].valid
);
391 ia_na_len
= sizeof(pa
);
392 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
394 // Reconfigure Accept
398 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
400 // Request Information Refresh
401 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
403 // Build vendor-class option
404 size_t vendor_class_len
, user_class_len
;
405 struct dhcpv6_vendorclass
*vendor_class
= odhcp6c_get_state(STATE_VENDORCLASS
, &vendor_class_len
);
406 void *user_class
= odhcp6c_get_state(STATE_USERCLASS
, &user_class_len
);
411 } vendor_class_hdr
= {htons(DHCPV6_OPT_VENDOR_CLASS
), htons(vendor_class_len
)};
416 } user_class_hdr
= {htons(DHCPV6_OPT_USER_CLASS
), htons(user_class_len
)};
420 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
424 uint16_t elapsed_type
;
425 uint16_t elapsed_len
;
426 uint16_t elapsed_value
;
430 type
, {trid
[0], trid
[1], trid
[2]},
431 htons(DHCPV6_OPT_ELAPSED
), htons(2),
432 htons((ecs
> 0xffff) ? 0xffff : ecs
),
433 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
436 struct iovec iov
[IOV_TOTAL
] = {
437 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
438 [IOV_ORO
] = {oro
, oro_len
},
439 [IOV_ORO_REFRESH
] = {&oro_refresh
, 0},
440 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
441 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
442 [IOV_VENDOR_CLASS_HDR
] = {&vendor_class_hdr
, vendor_class_len
? sizeof(vendor_class_hdr
) : 0},
443 [IOV_VENDOR_CLASS
] = {vendor_class
, vendor_class_len
},
444 [IOV_USER_CLASS_HDR
] = {&user_class_hdr
, user_class_len
? sizeof(user_class_hdr
) : 0},
445 [IOV_USER_CLASS
] = {user_class
, user_class_len
},
446 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
447 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
448 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
449 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
450 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
453 size_t cnt
= IOV_TOTAL
;
454 if (type
== DHCPV6_MSG_INFO_REQ
) {
456 iov
[IOV_ORO_REFRESH
].iov_len
= sizeof(oro_refresh
);
457 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
458 } else if (!request_prefix
) {
462 // Disable IAs if not used
463 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
464 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
466 if (na_mode
== IA_MODE_NONE
)
467 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
469 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
470 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
471 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
473 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
474 iov
[IOV_FQDN
].iov_len
= 0;
476 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
477 0, ALL_DHCPV6_RELAYS
, ifindex
};
478 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
479 .msg_iov
= iov
, .msg_iovlen
= cnt
};
481 sendmsg(sock
, &msg
, 0);
485 static int64_t dhcpv6_rand_delay(int64_t time
)
488 odhcp6c_random(&random
, sizeof(random
));
489 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
493 int dhcpv6_request(enum dhcpv6_msg type
)
496 uint64_t timeout
= UINT32_MAX
;
497 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
500 struct timespec ts
= {0, 0};
501 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
502 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
505 if (type
== DHCPV6_MSG_UNKNOWN
)
507 else if (type
== DHCPV6_MSG_RENEW
)
508 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
509 else if (type
== DHCPV6_MSG_REBIND
)
510 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
515 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %llus, max rc %d)",
516 retx
->name
, (unsigned long long)timeout
, retx
->max_rc
);
518 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
520 // Generate transaction ID
521 uint8_t trid
[3] = {0, 0, 0};
522 if (type
!= DHCPV6_MSG_UNKNOWN
)
523 odhcp6c_random(trid
, sizeof(trid
));
529 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
531 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
532 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
533 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
535 rto
= (retx
->init_timeo
* 1000 + delay
);
538 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
540 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
541 rto
= retx
->max_timeo
* 1000 +
542 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
544 // Calculate end for this round and elapsed time
545 uint64_t round_end
= round_start
+ rto
;
546 elapsed
= round_start
- start
;
548 // Don't wait too long if timeout differs from infinite
549 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
550 round_end
= timeout
* 1000 + start
;
552 // Built and send package
553 if (type
!= DHCPV6_MSG_UNKNOWN
) {
554 if (type
!= DHCPV6_MSG_SOLICIT
)
555 syslog(LOG_NOTICE
, "Send %s message (elapsed %llums, rc %d)",
556 retx
->name
, (unsigned long long)elapsed
, rc
);
557 dhcpv6_send(type
, trid
, elapsed
/ 10);
562 for (; len
< 0 && (round_start
< round_end
);
563 round_start
= odhcp6c_get_milli_time()) {
564 uint8_t buf
[1536], cmsg_buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
565 struct iovec iov
= {buf
, sizeof(buf
)};
566 struct sockaddr_in6 addr
;
567 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
568 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
,
569 .msg_controllen
= sizeof(cmsg_buf
)};
570 struct in6_pktinfo
*pktinfo
= NULL
;
573 // Check for pending signal
574 if (odhcp6c_signal_process())
577 // Set timeout for receiving
578 uint64_t t
= round_end
- round_start
;
579 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
580 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
584 len
= recvmsg(sock
, &msg
, 0);
588 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
589 ch
= CMSG_NXTHDR(&msg
, ch
)) {
590 if (ch
->cmsg_level
== SOL_IPV6
&&
591 ch
->cmsg_type
== IPV6_PKTINFO
) {
592 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
597 if (pktinfo
== NULL
) {
602 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
603 type
, &pktinfo
->ipi6_addr
)) {
608 uint8_t *opt
= &buf
[4];
609 uint8_t *opt_end
= opt
+ len
- 4;
611 round_start
= odhcp6c_get_milli_time();
612 elapsed
= round_start
- start
;
613 syslog(LOG_NOTICE
, "Got a valid reply after "
614 "%llums", (unsigned long long)elapsed
);
616 if (retx
->handler_reply
)
617 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
619 if (len
> 0 && round_end
- round_start
> 1000)
620 round_end
= 1000 + round_start
;
624 if (retx
->handler_finish
)
625 len
= retx
->handler_finish();
626 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
627 (!retx
->max_rc
|| rc
< retx
->max_rc
));
631 // Message validation checks according to RFC3315 chapter 15
632 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
633 const uint8_t transaction
[3], enum dhcpv6_msg type
,
634 const struct in6_addr
*daddr
)
636 const struct dhcpv6_header
*rep
= buf
;
637 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
638 transaction
, sizeof(rep
->tr_id
)))
639 return false; // Invalid reply
641 if (type
== DHCPV6_MSG_SOLICIT
) {
642 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
643 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
645 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
646 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
648 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
652 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
653 rcmsg
= DHCPV6_MSG_UNKNOWN
;
654 uint16_t otype
, olen
= UINT16_MAX
;
655 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
656 ia_present
= false, options_valid
= true;
658 size_t client_id_len
, server_id_len
;
659 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
660 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
662 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
663 if (otype
== DHCPV6_OPT_CLIENTID
) {
664 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
665 &odata
[-4], client_id
, client_id_len
);
666 } else if (otype
== DHCPV6_OPT_SERVERID
) {
668 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
669 &odata
[-4], server_id
, server_id_len
);
672 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
673 sizeof(struct dhcpv6_auth_reconfigure
)) {
674 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
675 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
679 uint8_t serverhash
[16], secretbytes
[64], hash
[16];
680 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
681 memset(r
->key
, 0, sizeof(r
->key
));
683 memset(secretbytes
, 0, sizeof(secretbytes
));
684 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
686 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
687 secretbytes
[i
] ^= 0x36;
690 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
691 md5_hash(buf
, len
, &md5
);
694 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
695 secretbytes
[i
] ^= 0x36;
696 secretbytes
[i
] ^= 0x5c;
700 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
701 md5_hash(hash
, 16, &md5
);
704 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
705 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
707 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
709 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
710 options_valid
= false;
712 else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
713 (otype
== DHCPV6_OPT_PD_EXCLUDE
)) {
714 // Options are not allowed on global level
715 options_valid
= false;
719 if (!options_valid
|| ((odata
+ olen
) > end
))
722 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
725 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
726 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
727 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
728 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
732 return clientid_ok
&& serverid_ok
;
736 int dhcpv6_poll_reconfigure(void)
738 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
740 ret
= dhcpv6_request(ret
);
746 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
, const int rc
,
747 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
749 uint16_t otype
, olen
;
750 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
751 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
752 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
753 odata
[0] == DHCPV6_MSG_RENEW
||
754 odata
[0] == DHCPV6_MSG_INFO_REQ
))
757 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, rc
, NULL
, NULL
, NULL
);
762 // Collect all advertised servers
763 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
764 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
766 uint16_t olen
, otype
;
767 uint8_t *odata
, pref
= 0;
768 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
770 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
771 bool have_na
= false;
774 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
775 if (orig
== DHCPV6_MSG_SOLICIT
&&
776 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
777 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
778 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
779 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
782 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
783 memcpy(cand
.duid
, odata
, olen
);
784 cand
.duid_len
= olen
;
785 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
786 int error
= ((int)odata
[0] << 8 | (int)odata
[1]);
789 case DHCPV6_NoPrefixAvail
:
790 // Status code on global level
791 cand
.preference
-= 2000;
797 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
798 cand
.preference
>= 0) {
799 cand
.preference
= pref
= odata
[0];
800 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
801 cand
.wants_reconfigure
= true;
802 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
803 uint32_t sol_max_rt
= ntohl(*((uint32_t *)odata
));
804 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
805 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
806 cand
.sol_max_rt
= sol_max_rt
;
807 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
808 uint32_t inf_max_rt
= ntohl(*((uint32_t *)odata
));
809 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
810 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
811 cand
.inf_max_rt
= inf_max_rt
;
812 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
) {
813 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
814 uint8_t *oend
= odata
+ olen
, *d
;
815 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
816 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
817 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
818 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
822 } else if (otype
== DHCPV6_OPT_IA_NA
) {
823 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
824 uint8_t *oend
= odata
+ olen
, *d
;
825 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
)
826 if (otype
== DHCPV6_OPT_IA_ADDR
&&
827 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
832 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
833 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
835 * RFC7083 states to process the SOL_MAX_RT and
836 * INF_MAX_RT options even if the DHCPv6 server
837 * did not propose any IA_NA and/or IA_PD
839 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
840 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
844 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
845 cand
.has_noaddravail
= true;
846 cand
.preference
-= 1000;
849 if (pd_mode
!= IA_MODE_NONE
) {
851 cand
.preference
+= 2000 + (128 - have_pd
);
853 cand
.preference
-= 2000;
856 if (cand
.duid_len
> 0) {
857 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
858 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
859 dhcpv6_add_server_cand(&cand
);
862 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
866 static int dhcpv6_commit_advert(void)
868 return dhcpv6_promote_server_cand();
872 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
873 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
875 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
876 if (dhcpv6_commit_advert() < 0)
879 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
883 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
884 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
887 uint16_t otype
, olen
;
888 uint32_t refresh
= 86400;
890 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
894 if (orig
== DHCPV6_MSG_UNKNOWN
) {
895 static time_t last_update
= 0;
896 time_t now
= odhcp6c_get_milli_time() / 1000;
898 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
901 if (t1
!= UINT32_MAX
)
904 if (t2
!= UINT32_MAX
)
907 if (t3
!= UINT32_MAX
)
920 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
921 // Delete NA and PD we have in the state from the Advert
922 odhcp6c_clear_state(STATE_IA_NA
);
923 odhcp6c_clear_state(STATE_IA_PD
);
927 odhcp6c_clear_state(STATE_DNS
);
928 odhcp6c_clear_state(STATE_SEARCH
);
929 odhcp6c_clear_state(STATE_SNTP_IP
);
930 odhcp6c_clear_state(STATE_NTP_IP
);
931 odhcp6c_clear_state(STATE_NTP_FQDN
);
932 odhcp6c_clear_state(STATE_SIP_IP
);
933 odhcp6c_clear_state(STATE_SIP_FQDN
);
934 odhcp6c_clear_state(STATE_AFTR_NAME
);
935 odhcp6c_clear_state(STATE_CER
);
936 odhcp6c_clear_state(STATE_S46_MAPT
);
937 odhcp6c_clear_state(STATE_S46_MAPE
);
938 odhcp6c_clear_state(STATE_S46_LW
);
939 odhcp6c_clear_state(STATE_PASSTHRU
);
942 // Parse and find all matching IAs
943 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
944 bool passthru
= true;
946 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
947 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
948 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
951 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
954 uint16_t code
= DHCPV6_Success
;
955 uint16_t stype
, slen
;
957 // Get and handle status code
958 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
959 stype
, slen
, sdata
) {
960 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
961 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
962 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
964 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
966 if (code
== DHCPV6_Success
)
969 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
970 code
, mdata
, mlen
, handled_status_codes
, &ret
);
979 if (code
!= DHCPV6_Success
)
982 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
984 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
985 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
986 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
987 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
989 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
992 else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
994 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
995 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
996 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
998 } else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1000 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1001 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1002 uint16_t stype
, slen
;
1004 // Test status and bail if error
1005 dhcpv6_for_each_option(odata
, odata
+ olen
,
1006 stype
, slen
, sdata
) {
1007 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1008 stype
== NTP_SRV_ADDR
))
1009 odhcp6c_add_state(STATE_NTP_IP
,
1011 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1012 odhcp6c_add_state(STATE_NTP_FQDN
,
1015 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1017 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1018 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
1019 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1020 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1021 refresh
= ntohl(*((uint32_t*)odata
));
1023 } else if (otype
== DHCPV6_OPT_AUTH
) {
1024 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1025 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1026 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1027 r
->reconf_type
== 1)
1028 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1031 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1033 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1035 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1037 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1038 uint32_t sol_max_rt
= ntohl(*((uint32_t *)odata
));
1039 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1040 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1041 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1043 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1044 uint32_t inf_max_rt
= ntohl(*((uint32_t *)odata
));
1045 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1046 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1047 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1050 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1051 sizeof(struct dhcpv6_cer_id
)) {
1052 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1053 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1054 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1055 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1058 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1059 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1061 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1063 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1065 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1067 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1068 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1070 } else if (otype
== DHCPV6_OPT_CLIENTID
||
1071 otype
== DHCPV6_OPT_SERVERID
||
1072 otype
== DHCPV6_OPT_IA_TA
||
1073 otype
== DHCPV6_OPT_PREF
||
1074 otype
== DHCPV6_OPT_UNICAST
||
1075 otype
== DHCPV6_OPT_FQDN
||
1076 otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
1079 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1083 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1086 if (orig
!= DHCPV6_MSG_INFO_REQ
) {
1087 // Update refresh timers if no fatal status code was received
1088 if ((ret
> 0) && dhcpv6_calc_refresh_timers()) {
1090 case DHCPV6_MSG_RENEW
:
1091 // Send further renews if T1 is not set
1095 case DHCPV6_MSG_REBIND
:
1096 // Send further rebinds if T1 and T2 is not set
1101 case DHCPV6_MSG_REQUEST
:
1102 // All server candidates can be cleared if not yet bound
1103 if (!odhcp6c_is_bound())
1104 dhcpv6_clear_all_server_cand();
1110 if (orig
== DHCPV6_MSG_REBIND
|| orig
== DHCPV6_MSG_REQUEST
) {
1111 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1112 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1117 // All server candidates can be cleared if not yet bound
1118 if (!odhcp6c_is_bound())
1119 dhcpv6_clear_all_server_cand();
1128 static int dhcpv6_parse_ia(void *opt
, void *end
)
1130 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1133 uint16_t otype
, olen
;
1136 t1
= ntohl(ia_hdr
->t1
);
1137 t2
= ntohl(ia_hdr
->t2
);
1142 // Update address IA
1143 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1144 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0,
1145 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0, 0};
1147 entry
.iaid
= ia_hdr
->iaid
;
1149 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1150 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1151 if (olen
+ 4U < sizeof(*prefix
))
1154 entry
.valid
= ntohl(prefix
->valid
);
1155 entry
.preferred
= ntohl(prefix
->preferred
);
1157 if (entry
.preferred
> entry
.valid
)
1160 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1161 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1162 if (entry
.t1
> entry
.t2
)
1163 entry
.t1
= entry
.t2
;
1165 entry
.length
= prefix
->prefix
;
1166 entry
.target
= prefix
->addr
;
1167 uint16_t stype
, slen
;
1170 #ifdef EXT_PREFIX_CLASS
1171 // Find prefix class, if any
1172 dhcpv6_for_each_option(&prefix
[1], odata
+ olen
,
1174 if (stype
== DHCPV6_OPT_PREFIX_CLASS
&& slen
== 2)
1175 entry
.class = sdata
[0] << 8 | sdata
[1];
1180 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1181 odata
+ olen
, stype
, slen
, sdata
) {
1182 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1185 uint8_t elen
= sdata
[0];
1189 if (elen
<= 32 || elen
<= entry
.length
) {
1195 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1196 if (slen
<= bytes
) {
1201 uint32_t exclude
= 0;
1203 exclude
= exclude
<< 8 | sdata
[bytes
];
1206 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1207 exclude
<<= 64 - elen
;
1209 // Abusing router & priority fields for exclusion
1210 entry
.router
= entry
.target
;
1211 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1212 entry
.priority
= elen
;
1216 odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, false);
1221 memset(&entry
.router
, 0, sizeof(entry
.router
));
1222 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1223 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1224 if (olen
+ 4U < sizeof(*addr
))
1227 entry
.preferred
= ntohl(addr
->preferred
);
1228 entry
.valid
= ntohl(addr
->valid
);
1230 if (entry
.preferred
> entry
.valid
)
1233 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1234 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1235 if (entry
.t1
> entry
.t2
)
1236 entry
.t1
= entry
.t2
;
1239 entry
.target
= addr
->addr
;
1241 #ifdef EXT_PREFIX_CLASS
1242 uint16_t stype
, slen
;
1244 // Find prefix class, if any
1245 dhcpv6_for_each_option(&addr
[1], odata
+ olen
,
1247 if (stype
== DHCPV6_OPT_PREFIX_CLASS
&& slen
== 2)
1248 entry
.class = sdata
[0] << 8 | sdata
[1];
1251 odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, false);
1259 static int dhcpv6_calc_refresh_timers(void)
1261 struct odhcp6c_entry
*e
;
1262 size_t ia_na_entries
, ia_pd_entries
, i
;
1263 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1265 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1266 ia_na_entries
/= sizeof(*e
);
1267 for (i
= 0; i
< ia_na_entries
; i
++) {
1274 if (e
[i
].valid
> l_t3
)
1278 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1279 ia_pd_entries
/= sizeof(*e
);
1280 for (i
= 0; i
< ia_pd_entries
; i
++) {
1287 if (e
[i
].valid
> l_t3
)
1291 if (ia_pd_entries
|| ia_na_entries
) {
1299 return (int)(ia_pd_entries
+ ia_na_entries
);
1303 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1304 const void *status_msg
, const int len
)
1306 uint8_t buf
[len
+ 3];
1308 memset(buf
, 0, sizeof(buf
));
1311 memcpy(&buf
[1], status_msg
, len
);
1315 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1320 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1321 const uint16_t code
, const void *status_msg
, const int len
,
1324 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1327 case DHCPV6_UnspecFail
:
1332 case DHCPV6_UseMulticast
:
1333 // TODO handle multicast status code
1336 case DHCPV6_NoAddrsAvail
:
1337 case DHCPV6_NoPrefixAvail
:
1338 if (orig
== DHCPV6_MSG_REQUEST
)
1339 *ret
= 0; // Failure
1348 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1349 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1350 const void *status_msg
, const int len
,
1351 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1353 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1354 "IA_NA" : "IA_PD", status_msg
, len
);
1357 case DHCPV6_NoBinding
:
1359 case DHCPV6_MSG_RENEW
:
1360 case DHCPV6_MSG_REBIND
:
1361 if ((*ret
> 0) && !handled_status_codes
[code
])
1362 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1376 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1379 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1381 // Remove identical duid server candidate
1382 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1383 if (cand
->duid_len
== c
[i
].duid_len
&&
1384 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1387 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1392 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1393 i
< cand_len
/ sizeof(*c
); ++i
) {
1394 if (c
[i
].preference
< cand
->preference
)
1398 odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
));
1401 static void dhcpv6_clear_all_server_cand(void)
1404 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1406 // Server candidates need deep delete for IA_NA/IA_PD
1407 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1411 odhcp6c_clear_state(STATE_SERVER_CAND
);
1414 int dhcpv6_promote_server_cand(void)
1417 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1419 int ret
= DHCPV6_STATELESS
;
1421 // Clear lingering candidate state info
1422 odhcp6c_clear_state(STATE_SERVER_ID
);
1423 odhcp6c_clear_state(STATE_IA_NA
);
1424 odhcp6c_clear_state(STATE_IA_PD
);
1429 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1430 na_mode
= IA_MODE_NONE
;
1432 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1433 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1435 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1438 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1439 hdr
[1] = htons(cand
->duid_len
);
1440 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1441 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1442 accept_reconfig
= cand
->wants_reconfigure
;
1443 if (cand
->ia_na_len
) {
1444 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1446 if (na_mode
!= IA_MODE_NONE
)
1447 ret
= DHCPV6_STATEFUL
;
1449 if (cand
->ia_pd_len
) {
1450 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1453 ret
= DHCPV6_STATEFUL
;
1456 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1457 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1459 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));