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.
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
33 #include <net/ethernet.h>
39 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
40 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
41 #define DHCPV6_CLIENT_PORT 546
42 #define DHCPV6_SERVER_PORT 547
43 #define DHCPV6_DUID_LLADDR 3
44 #define DHCPV6_REQ_DELAY 1
46 #define DHCPV6_SOL_MAX_RT_MIN 60
47 #define DHCPV6_SOL_MAX_RT_MAX 86400
48 #define DHCPV6_INF_MAX_RT_MIN 60
49 #define DHCPV6_INF_MAX_RT_MAX 86400
51 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
52 const uint8_t transaction
[3], enum dhcpv6_msg type
,
53 const struct in6_addr
*daddr
);
55 static int dhcpv6_parse_ia(void *opt
, void *end
);
57 static int dhcpv6_calc_refresh_timers(void);
58 static void dhcpv6_handle_status_code(_unused
const enum dhcpv6_msg orig
,
59 const uint16_t code
, const void *status_msg
, const int len
,
61 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
62 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
63 const void *status_msg
, const int len
,
64 bool handled_status_codes
[_DHCPV6_Status_Max
],
66 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
);
67 static void dhcpv6_clear_all_server_cand(void);
69 static reply_handler dhcpv6_handle_reply
;
70 static reply_handler dhcpv6_handle_advert
;
71 static reply_handler dhcpv6_handle_rebind_reply
;
72 static reply_handler dhcpv6_handle_reconfigure
;
73 static int dhcpv6_commit_advert(void);
77 // RFC 3315 - 5.5 Timeout and Delay values
78 static struct dhcpv6_retx dhcpv6_retx
[_DHCPV6_MSG_MAX
] = {
79 [DHCPV6_MSG_UNKNOWN
] = {false, 1, 120, 0, "<POLL>",
80 dhcpv6_handle_reconfigure
, NULL
},
81 [DHCPV6_MSG_SOLICIT
] = {true, 1, DHCPV6_SOL_MAX_RT
, 0, "SOLICIT",
82 dhcpv6_handle_advert
, dhcpv6_commit_advert
},
83 [DHCPV6_MSG_REQUEST
] = {true, 1, DHCPV6_REQ_MAX_RT
, 10, "REQUEST",
84 dhcpv6_handle_reply
, NULL
},
85 [DHCPV6_MSG_RENEW
] = {false, 10, DHCPV6_REN_MAX_RT
, 0, "RENEW",
86 dhcpv6_handle_reply
, NULL
},
87 [DHCPV6_MSG_REBIND
] = {false, 10, DHCPV6_REB_MAX_RT
, 0, "REBIND",
88 dhcpv6_handle_rebind_reply
, NULL
},
89 [DHCPV6_MSG_RELEASE
] = {false, 1, 0, 5, "RELEASE", NULL
, NULL
},
90 [DHCPV6_MSG_DECLINE
] = {false, 1, 0, 5, "DECLINE", NULL
, NULL
},
91 [DHCPV6_MSG_INFO_REQ
] = {true, 1, DHCPV6_INF_MAX_RT
, 0, "INFOREQ",
92 dhcpv6_handle_reply
, NULL
},
98 static int ifindex
= -1;
99 static int64_t t1
= 0, t2
= 0, t3
= 0;
102 static int request_prefix
= -1;
103 static enum odhcp6c_ia_mode na_mode
= IA_MODE_NONE
, pd_mode
= IA_MODE_NONE
;
104 static bool accept_reconfig
= false;
107 static uint8_t reconf_key
[16];
110 static unsigned int client_options
= 0;
113 static uint32_t ntohl_unaligned(const uint8_t *data
)
117 memcpy(&buf
, data
, sizeof(buf
));
121 int init_dhcpv6(const char *ifname
, unsigned int options
, int sol_timeout
)
123 client_options
= options
;
124 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_timeout
;
126 sock
= socket(AF_INET6
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
132 strncpy(ifr
.ifr_name
, ifname
, sizeof(ifr
.ifr_name
));
133 if (ioctl(sock
, SIOCGIFINDEX
, &ifr
) < 0)
135 ifindex
= ifr
.ifr_ifindex
;
137 // Create client DUID
138 size_t client_id_len
;
139 odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
140 if (client_id_len
== 0) {
141 uint8_t duid
[14] = {0, DHCPV6_OPT_CLIENTID
, 0, 10, 0,
142 DHCPV6_DUID_LLADDR
, 0, 1};
144 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) >= 0)
145 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
, ETHER_ADDR_LEN
);
147 uint8_t zero
[ETHER_ADDR_LEN
] = {0, 0, 0, 0, 0, 0};
148 struct ifreq ifs
[100], *ifp
, *ifend
;
151 ifc
.ifc_len
= sizeof(ifs
);
153 if (!memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
) &&
154 ioctl(sock
, SIOCGIFCONF
, &ifc
) >= 0) {
155 // If our interface doesn't have an address...
156 ifend
= ifs
+ (ifc
.ifc_len
/ sizeof(struct ifreq
));
157 for (ifp
= ifc
.ifc_req
; ifp
< ifend
&&
158 !memcmp(&duid
[8], zero
, ETHER_ADDR_LEN
); ifp
++) {
159 memcpy(ifr
.ifr_name
, ifp
->ifr_name
,
160 sizeof(ifr
.ifr_name
));
161 if (ioctl(sock
, SIOCGIFHWADDR
, &ifr
) < 0)
164 memcpy(&duid
[8], ifr
.ifr_hwaddr
.sa_data
,
169 odhcp6c_add_state(STATE_CLIENT_ID
, duid
, sizeof(duid
));
173 if (!(client_options
& DHCPV6_STRICT_OPTIONS
)) {
175 htons(DHCPV6_OPT_SIP_SERVER_D
),
176 htons(DHCPV6_OPT_SIP_SERVER_A
),
177 htons(DHCPV6_OPT_DNS_SERVERS
),
178 htons(DHCPV6_OPT_DNS_DOMAIN
),
179 htons(DHCPV6_OPT_SNTP_SERVERS
),
180 htons(DHCPV6_OPT_NTP_SERVER
),
181 htons(DHCPV6_OPT_AFTR_NAME
),
182 htons(DHCPV6_OPT_PD_EXCLUDE
),
183 htons(DHCPV6_OPT_SOL_MAX_RT
),
184 htons(DHCPV6_OPT_INF_MAX_RT
),
186 htons(DHCPV6_OPT_CER_ID
),
188 htons(DHCPV6_OPT_S46_CONT_MAPE
),
189 htons(DHCPV6_OPT_S46_CONT_MAPT
),
190 htons(DHCPV6_OPT_S46_CONT_LW
),
192 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
195 // Configure IPv6-options
197 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
198 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
199 setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
));
200 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
202 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
203 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
204 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
216 IOV_VENDOR_CLASS_HDR
,
228 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
230 int mode
= DHCPV6_UNKNOWN
;
235 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
236 mode
= DHCPV6_STATELESS
;
237 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
238 mode
= DHCPV6_STATEFUL
;
243 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
247 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
254 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
255 sizeof(fqdn
.data
), NULL
, NULL
);
256 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
257 fqdn
.len
= htons(fqdn_len
- 4);
263 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
267 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
270 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
273 if (type
== DHCPV6_MSG_SOLICIT
) {
274 odhcp6c_clear_state(STATE_IA_PD
);
276 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
277 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
279 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
281 for (size_t i
= 0; i
< n_prefixes
; i
++) {
282 struct dhcpv6_ia_hdr hdr_ia_pd
= {
283 htons(DHCPV6_OPT_IA_PD
),
284 htons(sizeof(hdr_ia_pd
) - 4 +
285 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
286 request_prefixes
[i
].iaid
, 0, 0
288 struct dhcpv6_ia_prefix pref
= {
289 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
290 .len
= htons(sizeof(pref
) - 4),
291 .prefix
= request_prefixes
[i
].length
293 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
294 ia_pd_len
+= sizeof(hdr_ia_pd
);
295 if (request_prefixes
[i
].length
) {
296 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
297 ia_pd_len
+= sizeof(pref
);
301 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
302 ia_pd_entries
/= sizeof(*e
);
304 // we're too lazy to count our distinct IAIDs,
305 // so just allocate maximally needed space
306 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
307 sizeof(struct dhcpv6_ia_hdr
)));
309 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
310 uint32_t iaid
= e
[i
].iaid
;
312 // check if this is an unprocessed IAID and skip if not.
314 for (int j
= i
-1; j
>= 0; j
--) {
315 if (e
[j
].iaid
== iaid
) {
325 struct dhcpv6_ia_hdr hdr_ia_pd
= {
326 htons(DHCPV6_OPT_IA_PD
),
327 htons(sizeof(hdr_ia_pd
) - 4),
331 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
332 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
333 ia_pd_len
+= sizeof(hdr_ia_pd
);
335 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
336 if (e
[j
].iaid
!= iaid
)
340 if (e
[j
].priority
> 0)
341 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
343 struct dhcpv6_ia_prefix p
= {
344 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
345 .len
= htons(sizeof(p
) - 4U + ex_len
),
346 .prefix
= e
[j
].length
,
350 if (type
== DHCPV6_MSG_REQUEST
) {
351 p
.preferred
= htonl(e
[j
].preferred
);
352 p
.valid
= htonl(e
[j
].valid
);
355 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
356 ia_pd_len
+= sizeof(p
);
359 ia_pd
[ia_pd_len
++] = 0;
360 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
361 ia_pd
[ia_pd_len
++] = 0;
362 ia_pd
[ia_pd_len
++] = ex_len
- 4;
363 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
365 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
366 excl
>>= (64 - e
[j
].priority
);
367 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
369 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
370 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
371 ia_pd_len
+= ex_len
- 5;
374 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
379 if (ia_pd_entries
> 0)
383 size_t ia_na_entries
, ia_na_len
= 0;
385 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
386 ia_na_entries
/= sizeof(*e
);
388 struct dhcpv6_ia_hdr hdr_ia_na
= {
389 htons(DHCPV6_OPT_IA_NA
),
390 htons(sizeof(hdr_ia_na
) - 4),
394 struct dhcpv6_ia_addr pa
[ia_na_entries
];
395 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
396 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
397 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
398 pa
[i
].addr
= e
[i
].target
;
400 if (type
== DHCPV6_MSG_REQUEST
) {
401 pa
[i
].preferred
= htonl(e
[i
].preferred
);
402 pa
[i
].valid
= htonl(e
[i
].valid
);
410 ia_na_len
= sizeof(pa
);
411 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
413 // Reconfigure Accept
417 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
419 // Request Information Refresh
420 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
422 // Build vendor-class option
423 size_t vendor_class_len
, user_class_len
;
424 struct dhcpv6_vendorclass
*vendor_class
= odhcp6c_get_state(STATE_VENDORCLASS
, &vendor_class_len
);
425 void *user_class
= odhcp6c_get_state(STATE_USERCLASS
, &user_class_len
);
430 } vendor_class_hdr
= {htons(DHCPV6_OPT_VENDOR_CLASS
), htons(vendor_class_len
)};
435 } user_class_hdr
= {htons(DHCPV6_OPT_USER_CLASS
), htons(user_class_len
)};
439 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
443 uint16_t elapsed_type
;
444 uint16_t elapsed_len
;
445 uint16_t elapsed_value
;
449 type
, {trid
[0], trid
[1], trid
[2]},
450 htons(DHCPV6_OPT_ELAPSED
), htons(2),
451 htons((ecs
> 0xffff) ? 0xffff : ecs
),
452 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
455 struct iovec iov
[IOV_TOTAL
] = {
456 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
457 [IOV_ORO
] = {oro
, oro_len
},
458 [IOV_ORO_REFRESH
] = {&oro_refresh
, 0},
459 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
460 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
461 [IOV_VENDOR_CLASS_HDR
] = {&vendor_class_hdr
, vendor_class_len
? sizeof(vendor_class_hdr
) : 0},
462 [IOV_VENDOR_CLASS
] = {vendor_class
, vendor_class_len
},
463 [IOV_USER_CLASS_HDR
] = {&user_class_hdr
, user_class_len
? sizeof(user_class_hdr
) : 0},
464 [IOV_USER_CLASS
] = {user_class
, user_class_len
},
465 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
466 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
467 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
468 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
469 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
472 size_t cnt
= IOV_TOTAL
;
473 if (type
== DHCPV6_MSG_INFO_REQ
) {
475 iov
[IOV_ORO_REFRESH
].iov_len
= sizeof(oro_refresh
);
476 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
477 } else if (!request_prefix
) {
481 // Disable IAs if not used
482 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
483 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
485 if (na_mode
== IA_MODE_NONE
)
486 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
488 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
489 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
490 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
492 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
493 iov
[IOV_FQDN
].iov_len
= 0;
495 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
496 0, ALL_DHCPV6_RELAYS
, ifindex
};
497 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
498 .msg_iov
= iov
, .msg_iovlen
= cnt
};
500 sendmsg(sock
, &msg
, 0);
504 static int64_t dhcpv6_rand_delay(int64_t time
)
507 odhcp6c_random(&random
, sizeof(random
));
508 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
512 int dhcpv6_request(enum dhcpv6_msg type
)
515 uint64_t timeout
= UINT32_MAX
;
516 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
519 struct timespec ts
= {0, 0};
520 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
521 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
524 if (type
== DHCPV6_MSG_UNKNOWN
)
526 else if (type
== DHCPV6_MSG_RENEW
)
527 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
528 else if (type
== DHCPV6_MSG_REBIND
)
529 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
534 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %llus, max rc %d)",
535 retx
->name
, (unsigned long long)timeout
, retx
->max_rc
);
537 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
539 // Generate transaction ID
540 uint8_t trid
[3] = {0, 0, 0};
541 if (type
!= DHCPV6_MSG_UNKNOWN
)
542 odhcp6c_random(trid
, sizeof(trid
));
548 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
550 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
551 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
552 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
554 rto
= (retx
->init_timeo
* 1000 + delay
);
557 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
559 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
560 rto
= retx
->max_timeo
* 1000 +
561 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
563 // Calculate end for this round and elapsed time
564 uint64_t round_end
= round_start
+ rto
;
565 elapsed
= round_start
- start
;
567 // Don't wait too long if timeout differs from infinite
568 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
569 round_end
= timeout
* 1000 + start
;
571 // Built and send package
573 case DHCPV6_MSG_UNKNOWN
:
576 syslog(LOG_NOTICE
, "Send %s message (elapsed %llums, rc %d)",
577 retx
->name
, (unsigned long long)elapsed
, rc
);
579 case DHCPV6_MSG_SOLICIT
:
580 case DHCPV6_MSG_INFO_REQ
:
581 dhcpv6_send(type
, trid
, elapsed
/ 10);
586 for (; len
< 0 && (round_start
< round_end
);
587 round_start
= odhcp6c_get_milli_time()) {
589 uint8_t cmsg_buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))]
590 __aligned(__alignof__(struct cmsghdr
));
591 struct iovec iov
= {buf
, sizeof(buf
)};
592 struct sockaddr_in6 addr
;
593 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
594 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
,
595 .msg_controllen
= sizeof(cmsg_buf
)};
596 struct in6_pktinfo
*pktinfo
= NULL
;
599 // Check for pending signal
600 if (odhcp6c_signal_process())
603 // Set timeout for receiving
604 uint64_t t
= round_end
- round_start
;
605 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
606 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
610 len
= recvmsg(sock
, &msg
, 0);
614 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
615 ch
= CMSG_NXTHDR(&msg
, ch
)) {
616 if (ch
->cmsg_level
== SOL_IPV6
&&
617 ch
->cmsg_type
== IPV6_PKTINFO
) {
618 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
623 if (pktinfo
== NULL
) {
628 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
629 type
, &pktinfo
->ipi6_addr
)) {
634 uint8_t *opt
= &buf
[4];
635 uint8_t *opt_end
= opt
+ len
- 4;
637 round_start
= odhcp6c_get_milli_time();
638 elapsed
= round_start
- start
;
639 syslog(LOG_NOTICE
, "Got a valid reply after "
640 "%llums", (unsigned long long)elapsed
);
642 if (retx
->handler_reply
)
643 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
645 if (len
> 0 && round_end
- round_start
> 1000)
646 round_end
= 1000 + round_start
;
650 if (retx
->handler_finish
)
651 len
= retx
->handler_finish();
652 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
653 (!retx
->max_rc
|| rc
< retx
->max_rc
));
657 // Message validation checks according to RFC3315 chapter 15
658 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
659 const uint8_t transaction
[3], enum dhcpv6_msg type
,
660 const struct in6_addr
*daddr
)
662 const struct dhcpv6_header
*rep
= buf
;
663 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
664 transaction
, sizeof(rep
->tr_id
)))
665 return false; // Invalid reply
667 if (type
== DHCPV6_MSG_SOLICIT
) {
668 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
669 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
671 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
672 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
674 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
678 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
679 rcmsg
= DHCPV6_MSG_UNKNOWN
;
680 uint16_t otype
, olen
= UINT16_MAX
;
681 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
682 ia_present
= false, options_valid
= true;
684 size_t client_id_len
, server_id_len
;
685 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
686 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
688 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
689 if (otype
== DHCPV6_OPT_CLIENTID
) {
690 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
691 &odata
[-4], client_id
, client_id_len
);
692 } else if (otype
== DHCPV6_OPT_SERVERID
) {
694 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
695 &odata
[-4], server_id
, server_id_len
);
698 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
699 sizeof(struct dhcpv6_auth_reconfigure
)) {
700 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
701 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
705 uint8_t serverhash
[16], secretbytes
[64];
707 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
708 memset(r
->key
, 0, sizeof(r
->key
));
710 memset(secretbytes
, 0, sizeof(secretbytes
));
711 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
713 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
714 secretbytes
[i
] ^= 0x36;
717 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
718 md5_hash(buf
, len
, &md5
);
721 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
722 secretbytes
[i
] ^= 0x36;
723 secretbytes
[i
] ^= 0x5c;
727 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
728 md5_hash(hash
, 16, &md5
);
731 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
732 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
734 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
736 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
737 options_valid
= false;
739 else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
740 (otype
== DHCPV6_OPT_PD_EXCLUDE
)) {
741 // Options are not allowed on global level
742 options_valid
= false;
746 if (!options_valid
|| ((odata
+ olen
) > end
))
749 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
752 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
753 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
754 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
755 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
759 return clientid_ok
&& serverid_ok
;
763 int dhcpv6_poll_reconfigure(void)
765 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
767 ret
= dhcpv6_request(ret
);
773 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
, const int rc
,
774 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
776 uint16_t otype
, olen
;
777 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
778 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
779 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
780 odata
[0] == DHCPV6_MSG_RENEW
||
781 odata
[0] == DHCPV6_MSG_INFO_REQ
))
784 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, rc
, NULL
, NULL
, NULL
);
789 // Collect all advertised servers
790 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
791 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
793 uint16_t olen
, otype
;
794 uint8_t *odata
, pref
= 0;
795 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
797 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
798 bool have_na
= false;
801 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
802 if (orig
== DHCPV6_MSG_SOLICIT
&&
803 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
804 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
805 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
806 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
809 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
810 memcpy(cand
.duid
, odata
, olen
);
811 cand
.duid_len
= olen
;
812 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
813 cand
.preference
>= 0) {
814 cand
.preference
= pref
= odata
[0];
815 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
816 cand
.wants_reconfigure
= true;
817 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
818 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
819 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
820 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
821 cand
.sol_max_rt
= sol_max_rt
;
822 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
823 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
824 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
825 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
826 cand
.inf_max_rt
= inf_max_rt
;
827 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
&&
828 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
829 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
830 uint8_t *oend
= odata
+ olen
, *d
;
831 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
832 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
833 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
834 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
838 } else if (otype
== DHCPV6_OPT_IA_NA
&&
839 olen
>= -4 + sizeof(struct dhcpv6_ia_hdr
)) {
840 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
841 uint8_t *oend
= odata
+ olen
, *d
;
842 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
)
843 if (otype
== DHCPV6_OPT_IA_ADDR
&&
844 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
849 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
850 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
852 * RFC7083 states to process the SOL_MAX_RT and
853 * INF_MAX_RT options even if the DHCPv6 server
854 * did not propose any IA_NA and/or IA_PD
856 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
857 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
861 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
862 cand
.has_noaddravail
= true;
863 cand
.preference
-= 1000;
866 if (pd_mode
!= IA_MODE_NONE
) {
868 cand
.preference
+= 2000 + (128 - have_pd
);
870 cand
.preference
-= 2000;
873 if (cand
.duid_len
> 0) {
874 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
875 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
876 dhcpv6_add_server_cand(&cand
);
879 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
883 static int dhcpv6_commit_advert(void)
885 return dhcpv6_promote_server_cand();
889 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
890 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
892 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
893 if (dhcpv6_commit_advert() < 0)
896 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
900 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
901 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
904 uint16_t otype
, olen
;
905 uint32_t refresh
= 86400;
907 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
911 if (orig
== DHCPV6_MSG_UNKNOWN
) {
912 static time_t last_update
= 0;
913 time_t now
= odhcp6c_get_milli_time() / 1000;
915 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
918 if (t1
!= UINT32_MAX
)
921 if (t2
!= UINT32_MAX
)
924 if (t3
!= UINT32_MAX
)
937 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
938 // Delete NA and PD we have in the state from the Advert
939 odhcp6c_clear_state(STATE_IA_NA
);
940 odhcp6c_clear_state(STATE_IA_PD
);
944 odhcp6c_clear_state(STATE_DNS
);
945 odhcp6c_clear_state(STATE_SEARCH
);
946 odhcp6c_clear_state(STATE_SNTP_IP
);
947 odhcp6c_clear_state(STATE_NTP_IP
);
948 odhcp6c_clear_state(STATE_NTP_FQDN
);
949 odhcp6c_clear_state(STATE_SIP_IP
);
950 odhcp6c_clear_state(STATE_SIP_FQDN
);
951 odhcp6c_clear_state(STATE_AFTR_NAME
);
952 odhcp6c_clear_state(STATE_CER
);
953 odhcp6c_clear_state(STATE_S46_MAPT
);
954 odhcp6c_clear_state(STATE_S46_MAPE
);
955 odhcp6c_clear_state(STATE_S46_LW
);
956 odhcp6c_clear_state(STATE_PASSTHRU
);
957 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
959 // Parse and find all matching IAs
960 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
961 bool passthru
= true;
963 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
964 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
965 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
967 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
968 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
972 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
975 uint16_t code
= DHCPV6_Success
;
976 uint16_t stype
, slen
;
978 // Get and handle status code
979 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
980 stype
, slen
, sdata
) {
981 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
982 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
983 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
985 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
987 if (code
== DHCPV6_Success
)
990 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
991 code
, mdata
, mlen
, handled_status_codes
, &ret
);
1000 if (code
!= DHCPV6_Success
)
1003 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
1005 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
1006 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
1007 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
1008 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
1010 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
1013 else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1015 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1016 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
1017 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1018 } else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1020 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1021 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1022 uint16_t stype
, slen
;
1024 // Test status and bail if error
1025 dhcpv6_for_each_option(odata
, odata
+ olen
,
1026 stype
, slen
, sdata
) {
1027 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1028 stype
== NTP_SRV_ADDR
))
1029 odhcp6c_add_state(STATE_NTP_IP
,
1031 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1032 odhcp6c_add_state(STATE_NTP_FQDN
,
1035 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1037 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1038 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
1039 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1040 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1041 refresh
= ntohl_unaligned(odata
);
1043 } else if (otype
== DHCPV6_OPT_AUTH
) {
1044 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1045 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1046 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1047 r
->reconf_type
== 1)
1048 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1051 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1053 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1055 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1057 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1058 uint32_t sol_max_rt
= ntohl_unaligned(odata
);
1059 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1060 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1061 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1063 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1064 uint32_t inf_max_rt
= ntohl_unaligned(odata
);
1065 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1066 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1067 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1070 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1071 sizeof(struct dhcpv6_cer_id
)) {
1072 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1073 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1074 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1075 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1078 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1079 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1081 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1083 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1085 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1087 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1088 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1090 } else if (otype
== DHCPV6_OPT_CLIENTID
||
1091 otype
== DHCPV6_OPT_SERVERID
||
1092 otype
== DHCPV6_OPT_IA_TA
||
1093 otype
== DHCPV6_OPT_PREF
||
1094 otype
== DHCPV6_OPT_UNICAST
||
1095 otype
== DHCPV6_OPT_FQDN
||
1096 otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
1099 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1103 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1107 if (orig
!= DHCPV6_MSG_INFO_REQ
) {
1108 // Update refresh timers if no fatal status code was received
1109 if ((ret
> 0) && dhcpv6_calc_refresh_timers()) {
1111 case DHCPV6_MSG_RENEW
:
1112 // Send further renews if T1 is not set
1116 case DHCPV6_MSG_REBIND
:
1117 // Send further rebinds if T1 and T2 is not set
1122 case DHCPV6_MSG_REQUEST
:
1123 // All server candidates can be cleared if not yet bound
1124 if (!odhcp6c_is_bound())
1125 dhcpv6_clear_all_server_cand();
1131 if (orig
== DHCPV6_MSG_REBIND
|| orig
== DHCPV6_MSG_REQUEST
) {
1132 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1133 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1138 // All server candidates can be cleared if not yet bound
1139 if (!odhcp6c_is_bound())
1140 dhcpv6_clear_all_server_cand();
1149 static int dhcpv6_parse_ia(void *opt
, void *end
)
1151 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1154 uint16_t otype
, olen
;
1157 t1
= ntohl(ia_hdr
->t1
);
1158 t2
= ntohl(ia_hdr
->t2
);
1163 // Update address IA
1164 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1165 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0, 0,
1166 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0};
1168 entry
.iaid
= ia_hdr
->iaid
;
1170 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1171 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1172 if (olen
+ 4U < sizeof(*prefix
))
1175 entry
.valid
= ntohl(prefix
->valid
);
1176 entry
.preferred
= ntohl(prefix
->preferred
);
1178 if (entry
.preferred
> entry
.valid
)
1181 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1182 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1183 if (entry
.t1
> entry
.t2
)
1184 entry
.t1
= entry
.t2
;
1186 entry
.length
= prefix
->prefix
;
1187 entry
.target
= prefix
->addr
;
1188 uint16_t stype
, slen
;
1193 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1194 odata
+ olen
, stype
, slen
, sdata
) {
1195 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1198 uint8_t elen
= sdata
[0];
1202 if (entry
.length
< 32 || elen
<= entry
.length
) {
1208 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1209 if (slen
<= bytes
) {
1214 uint32_t exclude
= 0;
1216 exclude
= exclude
<< 8 | sdata
[bytes
];
1219 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1220 exclude
<<= 64 - elen
;
1222 // Abusing router & priority fields for exclusion
1223 entry
.router
= entry
.target
;
1224 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1225 entry
.priority
= elen
;
1229 odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, false);
1234 memset(&entry
.router
, 0, sizeof(entry
.router
));
1235 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1236 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1237 if (olen
+ 4U < sizeof(*addr
))
1240 entry
.preferred
= ntohl(addr
->preferred
);
1241 entry
.valid
= ntohl(addr
->valid
);
1243 if (entry
.preferred
> entry
.valid
)
1246 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1247 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1248 if (entry
.t1
> entry
.t2
)
1249 entry
.t1
= entry
.t2
;
1252 entry
.target
= addr
->addr
;
1254 odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, false);
1262 static int dhcpv6_calc_refresh_timers(void)
1264 struct odhcp6c_entry
*e
;
1265 size_t ia_na_entries
, ia_pd_entries
, i
;
1266 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1268 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1269 ia_na_entries
/= sizeof(*e
);
1270 for (i
= 0; i
< ia_na_entries
; i
++) {
1277 if (e
[i
].valid
> l_t3
)
1281 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1282 ia_pd_entries
/= sizeof(*e
);
1283 for (i
= 0; i
< ia_pd_entries
; i
++) {
1290 if (e
[i
].valid
> l_t3
)
1294 if (ia_pd_entries
|| ia_na_entries
) {
1302 return (int)(ia_pd_entries
+ ia_na_entries
);
1306 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1307 const void *status_msg
, int len
)
1309 const char *src
= status_msg
;
1316 *dst
= isprint((unsigned char)*src
) ? *src
: '?';
1324 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1329 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1330 const uint16_t code
, const void *status_msg
, const int len
,
1333 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1336 case DHCPV6_UnspecFail
:
1341 case DHCPV6_UseMulticast
:
1342 // TODO handle multicast status code
1345 case DHCPV6_NoAddrsAvail
:
1346 case DHCPV6_NoPrefixAvail
:
1347 if (orig
== DHCPV6_MSG_REQUEST
)
1348 *ret
= 0; // Failure
1357 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1358 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1359 const void *status_msg
, const int len
,
1360 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1362 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1363 "IA_NA" : "IA_PD", status_msg
, len
);
1366 case DHCPV6_NoBinding
:
1368 case DHCPV6_MSG_RENEW
:
1369 case DHCPV6_MSG_REBIND
:
1370 if ((*ret
> 0) && !handled_status_codes
[code
])
1371 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1385 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1386 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1389 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1391 // Remove identical duid server candidate
1392 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1393 if (cand
->duid_len
== c
[i
].duid_len
&&
1394 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1397 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1402 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1403 i
< cand_len
/ sizeof(*c
); ++i
) {
1404 if (c
[i
].preference
< cand
->preference
)
1408 if (odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
))) {
1414 static void dhcpv6_clear_all_server_cand(void)
1417 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1419 // Server candidates need deep delete for IA_NA/IA_PD
1420 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1424 odhcp6c_clear_state(STATE_SERVER_CAND
);
1427 int dhcpv6_promote_server_cand(void)
1430 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1432 int ret
= DHCPV6_STATELESS
;
1434 // Clear lingering candidate state info
1435 odhcp6c_clear_state(STATE_SERVER_ID
);
1436 odhcp6c_clear_state(STATE_IA_NA
);
1437 odhcp6c_clear_state(STATE_IA_PD
);
1442 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1443 na_mode
= IA_MODE_NONE
;
1445 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1446 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1448 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1451 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1452 hdr
[1] = htons(cand
->duid_len
);
1453 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1454 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1455 accept_reconfig
= cand
->wants_reconfigure
;
1456 if (cand
->ia_na_len
) {
1457 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1459 if (na_mode
!= IA_MODE_NONE
)
1460 ret
= DHCPV6_STATEFUL
;
1462 if (cand
->ia_pd_len
) {
1463 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1466 ret
= DHCPV6_STATEFUL
;
1469 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1470 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1472 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));