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 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
183 // Configure IPv6-options
185 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
186 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
187 setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
));
189 setsockopt(sock
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &val
, sizeof(val
));
190 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
192 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
193 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
194 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
206 IOV_VENDOR_CLASS_HDR
,
218 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
224 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
228 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
235 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
236 sizeof(fqdn
.data
), NULL
, NULL
);
237 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
238 fqdn
.len
= htons(fqdn_len
- 4);
244 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
248 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
251 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
254 if (type
== DHCPV6_MSG_SOLICIT
) {
255 odhcp6c_clear_state(STATE_IA_PD
);
257 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
258 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
260 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
262 for (size_t i
= 0; i
< n_prefixes
; i
++) {
263 struct dhcpv6_ia_hdr hdr_ia_pd
= {
264 htons(DHCPV6_OPT_IA_PD
),
265 htons(sizeof(hdr_ia_pd
) - 4 + sizeof(struct dhcpv6_ia_prefix
)),
266 request_prefixes
[i
].iaid
, 0, 0
268 struct dhcpv6_ia_prefix pref
= {
269 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
270 .len
= htons(25), .prefix
= request_prefixes
[i
].length
272 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
273 ia_pd_len
+= sizeof(hdr_ia_pd
);
274 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
275 ia_pd_len
+= sizeof(pref
);
278 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
279 ia_pd_entries
/= sizeof(*e
);
281 // we're too lazy to count our distinct IAIDs,
282 // so just allocate maximally needed space
283 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
284 sizeof(struct dhcpv6_ia_hdr
)));
286 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
287 uint32_t iaid
= e
[i
].iaid
;
289 // check if this is an unprocessed IAID and skip if not.
291 for (int j
= i
-1; j
>= 0; j
--) {
292 if (e
[j
].iaid
== iaid
) {
302 struct dhcpv6_ia_hdr hdr_ia_pd
= {
303 htons(DHCPV6_OPT_IA_PD
),
304 htons(sizeof(hdr_ia_pd
) - 4),
308 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
309 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
310 ia_pd_len
+= sizeof(hdr_ia_pd
);
312 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
313 if (e
[j
].iaid
!= iaid
)
317 if (e
[j
].priority
> 0)
318 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
320 struct dhcpv6_ia_prefix p
= {
321 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
322 .len
= htons(sizeof(p
) - 4U + ex_len
),
323 .prefix
= e
[j
].length
,
327 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
328 ia_pd_len
+= sizeof(p
);
331 ia_pd
[ia_pd_len
++] = 0;
332 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
333 ia_pd
[ia_pd_len
++] = 0;
334 ia_pd
[ia_pd_len
++] = ex_len
- 4;
335 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
337 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
338 excl
>>= (64 - e
[j
].priority
);
339 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
341 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
342 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
343 ia_pd_len
+= ex_len
- 5;
346 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
351 if (ia_pd_entries
> 0)
355 size_t ia_na_entries
, ia_na_len
= 0;
357 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
358 ia_na_entries
/= sizeof(*e
);
360 struct dhcpv6_ia_hdr hdr_ia_na
= {
361 htons(DHCPV6_OPT_IA_NA
),
362 htons(sizeof(hdr_ia_na
) - 4),
366 struct dhcpv6_ia_addr pa
[ia_na_entries
];
367 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
368 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
369 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
370 pa
[i
].addr
= e
[i
].target
;
376 ia_na_len
= sizeof(pa
);
377 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
379 // Reconfigure Accept
383 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
385 // Request Information Refresh
386 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
388 // Build vendor-class option
389 size_t vendor_class_len
, user_class_len
;
390 struct dhcpv6_vendorclass
*vendor_class
= odhcp6c_get_state(STATE_VENDORCLASS
, &vendor_class_len
);
391 void *user_class
= odhcp6c_get_state(STATE_USERCLASS
, &user_class_len
);
396 } vendor_class_hdr
= {htons(DHCPV6_OPT_VENDOR_CLASS
), htons(vendor_class_len
)};
401 } user_class_hdr
= {htons(DHCPV6_OPT_USER_CLASS
), htons(user_class_len
)};
405 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
409 uint16_t elapsed_type
;
410 uint16_t elapsed_len
;
411 uint16_t elapsed_value
;
415 type
, {trid
[0], trid
[1], trid
[2]},
416 htons(DHCPV6_OPT_ELAPSED
), htons(2),
417 htons((ecs
> 0xffff) ? 0xffff : ecs
),
418 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
421 struct iovec iov
[IOV_TOTAL
] = {
422 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
423 [IOV_ORO
] = {oro
, oro_len
},
424 [IOV_ORO_REFRESH
] = {&oro_refresh
, 0},
425 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
426 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
427 [IOV_VENDOR_CLASS_HDR
] = {&vendor_class_hdr
, vendor_class_len
? sizeof(vendor_class_hdr
) : 0},
428 [IOV_VENDOR_CLASS
] = {vendor_class
, vendor_class_len
},
429 [IOV_USER_CLASS_HDR
] = {&user_class_hdr
, user_class_len
? sizeof(user_class_hdr
) : 0},
430 [IOV_USER_CLASS
] = {user_class
, user_class_len
},
431 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
432 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
433 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
434 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
435 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
438 size_t cnt
= IOV_TOTAL
;
439 if (type
== DHCPV6_MSG_INFO_REQ
) {
441 iov
[IOV_ORO_REFRESH
].iov_len
= sizeof(oro_refresh
);
442 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
443 } else if (!request_prefix
) {
447 // Disable IAs if not used
448 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
449 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
451 if (na_mode
== IA_MODE_NONE
)
452 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
454 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
455 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
456 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
458 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
459 iov
[IOV_FQDN
].iov_len
= 0;
461 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
462 0, ALL_DHCPV6_RELAYS
, ifindex
};
463 struct msghdr msg
= {&srv
, sizeof(srv
), iov
, cnt
, NULL
, 0, 0};
465 sendmsg(sock
, &msg
, 0);
469 static int64_t dhcpv6_rand_delay(int64_t time
)
472 odhcp6c_random(&random
, sizeof(random
));
473 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
477 int dhcpv6_request(enum dhcpv6_msg type
)
480 uint64_t timeout
= UINT32_MAX
;
481 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
484 struct timespec ts
= {0, 0};
485 ts
.tv_nsec
= dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY
);
486 nanosleep(&ts
, NULL
);
489 if (type
== DHCPV6_MSG_UNKNOWN
)
491 else if (type
== DHCPV6_MSG_RENEW
)
492 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
493 else if (type
== DHCPV6_MSG_REBIND
)
494 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
499 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %llus, max rc %d)",
500 retx
->name
, (unsigned long long)timeout
, retx
->max_rc
);
502 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
504 // Generate transaction ID
505 uint8_t trid
[3] = {0, 0, 0};
506 if (type
!= DHCPV6_MSG_UNKNOWN
)
507 odhcp6c_random(trid
, sizeof(trid
));
513 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
515 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
516 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
517 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
519 rto
= (retx
->init_timeo
* 1000 + delay
);
522 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
524 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
525 rto
= retx
->max_timeo
* 1000 +
526 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
528 // Calculate end for this round and elapsed time
529 uint64_t round_end
= round_start
+ rto
;
530 elapsed
= round_start
- start
;
532 // Don't wait too long if timeout differs from infinite
533 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
534 round_end
= timeout
* 1000 + start
;
536 // Built and send package
537 if (type
!= DHCPV6_MSG_UNKNOWN
) {
538 if (type
!= DHCPV6_MSG_SOLICIT
)
539 syslog(LOG_NOTICE
, "Send %s message (elapsed %llums, rc %d)",
540 retx
->name
, (unsigned long long)elapsed
, rc
);
541 dhcpv6_send(type
, trid
, elapsed
/ 10);
546 for (; len
< 0 && (round_start
< round_end
);
547 round_start
= odhcp6c_get_milli_time()) {
548 uint8_t buf
[1536], cmsg_buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
549 struct iovec iov
= {buf
, sizeof(buf
)};
550 struct msghdr msg
= {NULL
, 0, &iov
, 1,
551 cmsg_buf
, sizeof(cmsg_buf
), 0};
552 struct in6_pktinfo
*pktinfo
= NULL
;
554 // Check for pending signal
555 if (odhcp6c_signal_process())
558 // Set timeout for receiving
559 uint64_t t
= round_end
- round_start
;
560 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
561 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
565 len
= recvmsg(sock
, &msg
, 0);
569 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
570 ch
= CMSG_NXTHDR(&msg
, ch
)) {
571 if (ch
->cmsg_level
== SOL_IPV6
&&
572 ch
->cmsg_type
== IPV6_PKTINFO
) {
573 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
578 if (pktinfo
== NULL
) {
583 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
584 type
, &pktinfo
->ipi6_addr
)) {
589 uint8_t *opt
= &buf
[4];
590 uint8_t *opt_end
= opt
+ len
- 4;
592 round_start
= odhcp6c_get_milli_time();
593 elapsed
= round_start
- start
;
594 syslog(LOG_NOTICE
, "Got a valid reply after "
595 "%llums", (unsigned long long)elapsed
);
597 if (retx
->handler_reply
)
598 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
);
600 if (len
> 0 && round_end
- round_start
> 1000)
601 round_end
= 1000 + round_start
;
605 if (retx
->handler_finish
)
606 len
= retx
->handler_finish();
607 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
608 (!retx
->max_rc
|| rc
< retx
->max_rc
));
612 // Message validation checks according to RFC3315 chapter 15
613 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
614 const uint8_t transaction
[3], enum dhcpv6_msg type
,
615 const struct in6_addr
*daddr
)
617 const struct dhcpv6_header
*rep
= buf
;
618 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
619 transaction
, sizeof(rep
->tr_id
)))
620 return false; // Invalid reply
622 if (type
== DHCPV6_MSG_SOLICIT
) {
623 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
624 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
626 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
627 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
629 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
633 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
634 rcmsg
= DHCPV6_MSG_UNKNOWN
;
635 uint16_t otype
, olen
= UINT16_MAX
;
636 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
637 ia_present
= false, options_valid
= true;
639 size_t client_id_len
, server_id_len
;
640 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
641 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
643 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
644 if (otype
== DHCPV6_OPT_CLIENTID
) {
645 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
646 &odata
[-4], client_id
, client_id_len
);
647 } else if (otype
== DHCPV6_OPT_SERVERID
) {
649 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
650 &odata
[-4], server_id
, server_id_len
);
653 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
654 sizeof(struct dhcpv6_auth_reconfigure
)) {
655 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
656 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
660 uint8_t serverhash
[16], secretbytes
[64], hash
[16];
661 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
662 memset(r
->key
, 0, sizeof(r
->key
));
664 memset(secretbytes
, 0, sizeof(secretbytes
));
665 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
667 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
668 secretbytes
[i
] ^= 0x36;
671 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
672 md5_hash(buf
, len
, &md5
);
675 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
676 secretbytes
[i
] ^= 0x36;
677 secretbytes
[i
] ^= 0x5c;
681 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
682 md5_hash(hash
, 16, &md5
);
685 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
686 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
688 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
690 if (olen
< sizeof(struct dhcpv6_ia_hdr
))
691 options_valid
= false;
693 else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
694 (otype
== DHCPV6_OPT_PD_EXCLUDE
)) {
695 // Options are not allowed on global level
696 options_valid
= false;
700 if (!options_valid
|| ((odata
+ olen
) > end
))
703 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
706 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
707 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
708 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
709 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
713 return clientid_ok
&& serverid_ok
;
717 int dhcpv6_poll_reconfigure(void)
719 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
721 ret
= dhcpv6_request(ret
);
727 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
, const int rc
,
728 const void *opt
, const void *end
)
730 uint16_t otype
, olen
;
731 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
732 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
733 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
734 odata
[0] == DHCPV6_MSG_RENEW
||
735 odata
[0] == DHCPV6_MSG_INFO_REQ
))
738 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, rc
, NULL
, NULL
);
743 // Collect all advertised servers
744 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
745 const void *opt
, const void *end
)
747 uint16_t olen
, otype
;
748 uint8_t *odata
, pref
= 0;
749 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
751 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
752 bool have_na
= false;
755 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
756 if (orig
== DHCPV6_MSG_SOLICIT
&&
757 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
758 olen
> sizeof(struct dhcpv6_ia_hdr
)) {
759 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
760 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
763 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
764 memcpy(cand
.duid
, odata
, olen
);
765 cand
.duid_len
= olen
;
766 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
767 int error
= ((int)odata
[0] << 8 | (int)odata
[1]);
770 case DHCPV6_NoPrefixAvail
:
771 // Status code on global level
772 cand
.preference
-= 2000;
778 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
779 cand
.preference
>= 0) {
780 cand
.preference
= pref
= odata
[0];
781 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
782 cand
.wants_reconfigure
= true;
783 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
784 uint32_t sol_max_rt
= ntohl(*((uint32_t *)odata
));
785 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
786 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
787 cand
.sol_max_rt
= sol_max_rt
;
788 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
789 uint32_t inf_max_rt
= ntohl(*((uint32_t *)odata
));
790 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
791 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
792 cand
.inf_max_rt
= inf_max_rt
;
793 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
) {
794 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
795 uint8_t *oend
= odata
+ olen
, *d
;
796 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
797 if (otype
== DHCPV6_OPT_IA_PREFIX
&& (olen
+ 4) >=
798 (uint16_t)sizeof(struct dhcpv6_ia_prefix
)) {
799 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
803 } else if (otype
== DHCPV6_OPT_IA_NA
) {
804 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
805 uint8_t *oend
= odata
+ olen
, *d
;
806 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
)
807 if (otype
== DHCPV6_OPT_IA_ADDR
)
812 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
813 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
815 * RFC7083 states to process the SOL_MAX_RT and
816 * INF_MAX_RT options even if the DHCPv6 server
817 * did not propose any IA_NA and/or IA_PD
819 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
820 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
824 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
825 cand
.has_noaddravail
= true;
826 cand
.preference
-= 1000;
829 if (pd_mode
!= IA_MODE_NONE
) {
831 cand
.preference
+= 2000 + (128 - have_pd
);
833 cand
.preference
-= 2000;
836 if (cand
.duid_len
> 0) {
837 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
838 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
839 dhcpv6_add_server_cand(&cand
);
842 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
846 static int dhcpv6_commit_advert(void)
848 return dhcpv6_promote_server_cand();
852 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
853 const void *opt
, const void *end
)
855 dhcpv6_handle_advert(orig
, rc
, opt
, end
);
856 if (dhcpv6_commit_advert() < 0)
859 return dhcpv6_handle_reply(orig
, rc
, opt
, end
);
863 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
864 const void *opt
, const void *end
)
867 uint16_t otype
, olen
;
868 uint32_t refresh
= UINT32_MAX
;
870 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
874 if (orig
== DHCPV6_MSG_UNKNOWN
) {
875 static time_t last_update
= 0;
876 time_t now
= odhcp6c_get_milli_time() / 1000;
878 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
881 if (t1
!= UINT32_MAX
)
884 if (t2
!= UINT32_MAX
)
887 if (t3
!= UINT32_MAX
)
900 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
901 // Delete NA and PD we have in the state from the Advert
902 odhcp6c_clear_state(STATE_IA_NA
);
903 odhcp6c_clear_state(STATE_IA_PD
);
907 odhcp6c_clear_state(STATE_DNS
);
908 odhcp6c_clear_state(STATE_SEARCH
);
909 odhcp6c_clear_state(STATE_SNTP_IP
);
910 odhcp6c_clear_state(STATE_NTP_IP
);
911 odhcp6c_clear_state(STATE_NTP_FQDN
);
912 odhcp6c_clear_state(STATE_SIP_IP
);
913 odhcp6c_clear_state(STATE_SIP_FQDN
);
914 odhcp6c_clear_state(STATE_AFTR_NAME
);
917 // Parse and find all matching IAs
918 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
919 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
920 && olen
> sizeof(struct dhcpv6_ia_hdr
)) {
921 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
924 if (ia_hdr
->iaid
!= 1 && otype
== DHCPV6_OPT_IA_NA
)
927 uint16_t code
= DHCPV6_Success
;
928 uint16_t stype
, slen
;
930 // Get and handle status code
931 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
932 stype
, slen
, sdata
) {
933 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
934 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
935 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
937 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
939 if (code
== DHCPV6_Success
)
942 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
943 code
, mdata
, mlen
, handled_status_codes
, &ret
);
952 if (code
!= DHCPV6_Success
)
955 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
956 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
957 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
958 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
959 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
961 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
963 else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
965 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
966 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
967 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
968 } else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
970 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
971 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
972 uint16_t stype
, slen
;
974 // Test status and bail if error
975 dhcpv6_for_each_option(odata
, odata
+ olen
,
976 stype
, slen
, sdata
) {
977 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
978 stype
== NTP_SRV_ADDR
))
979 odhcp6c_add_state(STATE_NTP_IP
,
981 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
982 odhcp6c_add_state(STATE_NTP_FQDN
,
985 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
987 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
988 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
989 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
990 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
991 refresh
= ntohl(*((uint32_t*)odata
));
992 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
993 sizeof(struct dhcpv6_auth_reconfigure
)) {
994 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
995 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
997 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
998 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1000 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1002 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1003 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1004 uint32_t sol_max_rt
= ntohl(*((uint32_t *)odata
));
1005 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1006 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1007 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1008 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1009 uint32_t inf_max_rt
= ntohl(*((uint32_t *)odata
));
1010 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1011 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1012 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1013 }else if (otype
!= DHCPV6_OPT_CLIENTID
&&
1014 otype
!= DHCPV6_OPT_SERVERID
) {
1015 odhcp6c_add_state(STATE_CUSTOM_OPTS
,
1016 &odata
[-4], olen
+ 4);
1020 if (orig
!= DHCPV6_MSG_INFO_REQ
) {
1021 // Update refresh timers if no fatal status code was received
1022 if ((ret
> 0) && dhcpv6_calc_refresh_timers()) {
1024 case DHCPV6_MSG_RENEW
:
1025 // Send further renews if T1 is not set
1029 case DHCPV6_MSG_REBIND
:
1030 // Send further rebinds if T1 and T2 is not set
1035 case DHCPV6_MSG_REQUEST
:
1036 // All server candidates can be cleared if not yet bound
1037 if (!odhcp6c_is_bound())
1038 dhcpv6_clear_all_server_cand();
1046 // All server candidates can be cleared if not yet bound
1047 if (!odhcp6c_is_bound())
1048 dhcpv6_clear_all_server_cand();
1057 static int dhcpv6_parse_ia(void *opt
, void *end
)
1059 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1062 uint16_t otype
, olen
;
1065 t1
= ntohl(ia_hdr
->t1
);
1066 t2
= ntohl(ia_hdr
->t2
);
1071 // Update address IA
1072 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1073 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0,
1074 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0, 0};
1076 entry
.iaid
= ia_hdr
->iaid
;
1078 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1079 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1080 if (olen
+ 4U < sizeof(*prefix
))
1083 entry
.valid
= ntohl(prefix
->valid
);
1084 entry
.preferred
= ntohl(prefix
->preferred
);
1086 if (entry
.preferred
> entry
.valid
)
1089 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1090 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1091 if (entry
.t1
> entry
.t2
)
1092 entry
.t1
= entry
.t2
;
1094 entry
.length
= prefix
->prefix
;
1095 entry
.target
= prefix
->addr
;
1096 uint16_t stype
, slen
;
1099 #ifdef EXT_PREFIX_CLASS
1100 // Find prefix class, if any
1101 dhcpv6_for_each_option(&prefix
[1], odata
+ olen
,
1103 if (stype
== DHCPV6_OPT_PREFIX_CLASS
&& slen
== 2)
1104 entry
.class = sdata
[0] << 8 | sdata
[1];
1109 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1110 odata
+ olen
, stype
, slen
, sdata
) {
1111 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1114 uint8_t elen
= sdata
[0];
1118 if (elen
<= 32 || elen
<= entry
.length
) {
1124 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1125 if (slen
<= bytes
) {
1130 uint32_t exclude
= 0;
1132 exclude
= exclude
<< 8 | sdata
[bytes
];
1135 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1136 exclude
<<= 64 - elen
;
1138 // Abusing router & priority fields for exclusion
1139 entry
.router
= entry
.target
;
1140 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1141 entry
.priority
= elen
;
1145 odhcp6c_update_entry(STATE_IA_PD
, &entry
);
1150 memset(&entry
.router
, 0, sizeof(entry
.router
));
1151 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1152 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1153 if (olen
+ 4U < sizeof(*addr
))
1156 entry
.preferred
= ntohl(addr
->preferred
);
1157 entry
.valid
= ntohl(addr
->valid
);
1159 if (entry
.preferred
> entry
.valid
)
1162 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1163 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1164 if (entry
.t1
> entry
.t2
)
1165 entry
.t1
= entry
.t2
;
1168 entry
.target
= addr
->addr
;
1170 #ifdef EXT_PREFIX_CLASS
1171 uint16_t stype
, slen
;
1173 // Find prefix class, if any
1174 dhcpv6_for_each_option(&addr
[1], odata
+ olen
,
1176 if (stype
== DHCPV6_OPT_PREFIX_CLASS
&& slen
== 2)
1177 entry
.class = sdata
[0] << 8 | sdata
[1];
1180 odhcp6c_update_entry(STATE_IA_NA
, &entry
);
1188 static int dhcpv6_calc_refresh_timers(void)
1190 struct odhcp6c_entry
*e
;
1191 size_t ia_na_entries
, ia_pd_entries
, i
;
1192 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1194 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1195 ia_na_entries
/= sizeof(*e
);
1196 for (i
= 0; i
< ia_na_entries
; i
++) {
1203 if (e
[i
].valid
> l_t3
)
1207 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1208 ia_pd_entries
/= sizeof(*e
);
1209 for (i
= 0; i
< ia_pd_entries
; i
++) {
1216 if (e
[i
].valid
> l_t3
)
1220 if (ia_pd_entries
|| ia_na_entries
) {
1228 return (int)(ia_pd_entries
+ ia_na_entries
);
1232 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1233 const void *status_msg
, const int len
)
1235 uint8_t buf
[len
+ 3];
1237 memset(buf
, 0, sizeof(buf
));
1240 memcpy(&buf
[1], status_msg
, len
);
1244 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1249 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1250 const uint16_t code
, const void *status_msg
, const int len
,
1253 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1256 case DHCPV6_UnspecFail
:
1261 case DHCPV6_UseMulticast
:
1262 // TODO handle multicast status code
1265 case DHCPV6_NoAddrsAvail
:
1266 case DHCPV6_NoPrefixAvail
:
1267 if (orig
== DHCPV6_MSG_REQUEST
)
1268 *ret
= 0; // Failure
1277 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1278 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1279 const void *status_msg
, const int len
,
1280 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1282 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1283 "IA_NA" : "IA_PD", status_msg
, len
);
1286 case DHCPV6_NoBinding
:
1288 case DHCPV6_MSG_RENEW
:
1289 case DHCPV6_MSG_REBIND
:
1290 if ((*ret
> 0) && !handled_status_codes
[code
])
1291 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1299 case DHCPV6_NoAddrsAvail
:
1300 case DHCPV6_NoPrefixAvail
:
1302 case DHCPV6_MSG_REQUEST
:
1311 case DHCPV6_NotOnLink
:
1312 // TODO handle not onlink in case of confirm
1320 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1323 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1325 // Remove identical duid server candidate
1326 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1327 if (cand
->duid_len
== c
[i
].duid_len
&&
1328 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1331 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1336 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1337 i
< cand_len
/ sizeof(*c
); ++i
) {
1338 if (c
[i
].preference
< cand
->preference
)
1342 odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
));
1345 static void dhcpv6_clear_all_server_cand(void)
1348 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1350 // Server candidates need deep delete for IA_NA/IA_PD
1351 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1355 odhcp6c_clear_state(STATE_SERVER_CAND
);
1358 int dhcpv6_promote_server_cand(void)
1361 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1363 int ret
= (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
) ?
1364 DHCPV6_STATELESS
: DHCPV6_STATEFUL
;
1366 // Clear lingering candidate state info
1367 odhcp6c_clear_state(STATE_SERVER_ID
);
1368 odhcp6c_clear_state(STATE_IA_NA
);
1369 odhcp6c_clear_state(STATE_IA_PD
);
1374 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1375 na_mode
= IA_MODE_NONE
;
1377 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1378 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1380 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1383 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1384 hdr
[1] = htons(cand
->duid_len
);
1385 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1386 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1387 accept_reconfig
= cand
->wants_reconfigure
;
1388 if (cand
->ia_na_len
) {
1389 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1391 if (na_mode
!= IA_MODE_NONE
)
1392 ret
= DHCPV6_STATEFUL
;
1394 if (cand
->ia_pd_len
) {
1395 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1398 ret
= DHCPV6_STATEFUL
;
1401 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1402 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1404 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));