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
),
177 htons(DHCPV6_OPT_CER_ID
),
179 htons(DHCPV6_OPT_S46_CONT_MAPE
),
180 htons(DHCPV6_OPT_S46_CONT_MAPT
),
181 htons(DHCPV6_OPT_S46_CONT_LW
),
183 odhcp6c_add_state(STATE_ORO
, oro
, sizeof(oro
));
186 // Configure IPv6-options
188 setsockopt(sock
, IPPROTO_IPV6
, IPV6_V6ONLY
, &val
, sizeof(val
));
189 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
190 setsockopt(sock
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &val
, sizeof(val
));
191 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
, ifname
, strlen(ifname
));
193 struct sockaddr_in6 client_addr
= { .sin6_family
= AF_INET6
,
194 .sin6_port
= htons(DHCPV6_CLIENT_PORT
), .sin6_flowinfo
= 0 };
195 if (bind(sock
, (struct sockaddr
*)&client_addr
, sizeof(client_addr
)) < 0)
207 IOV_VENDOR_CLASS_HDR
,
219 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
)
221 int mode
= DHCPV6_UNKNOWN
;
226 if (na_mode
== IA_MODE_NONE
&& pd_mode
== IA_MODE_NONE
)
227 mode
= DHCPV6_STATELESS
;
228 else if (na_mode
== IA_MODE_FORCE
|| pd_mode
== IA_MODE_FORCE
)
229 mode
= DHCPV6_STATEFUL
;
234 static void dhcpv6_send(enum dhcpv6_msg type
, uint8_t trid
[3], uint32_t ecs
)
238 gethostname(fqdn_buf
, sizeof(fqdn_buf
));
245 size_t fqdn_len
= 5 + dn_comp(fqdn_buf
, fqdn
.data
,
246 sizeof(fqdn
.data
), NULL
, NULL
);
247 fqdn
.type
= htons(DHCPV6_OPT_FQDN
);
248 fqdn
.len
= htons(fqdn_len
- 4);
254 void *cl_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &cl_id_len
);
258 void *srv_id
= odhcp6c_get_state(STATE_SERVER_ID
, &srv_id_len
);
261 size_t ia_pd_entries
= 0, ia_pd_len
= 0;
264 if (type
== DHCPV6_MSG_SOLICIT
) {
265 odhcp6c_clear_state(STATE_IA_PD
);
267 struct odhcp6c_request_prefix
*request_prefixes
= odhcp6c_get_state(STATE_IA_PD_INIT
, &n_prefixes
);
268 n_prefixes
/= sizeof(struct odhcp6c_request_prefix
);
270 ia_pd
= alloca(n_prefixes
* (sizeof(struct dhcpv6_ia_hdr
) + sizeof(struct dhcpv6_ia_prefix
)));
272 for (size_t i
= 0; i
< n_prefixes
; i
++) {
273 struct dhcpv6_ia_hdr hdr_ia_pd
= {
274 htons(DHCPV6_OPT_IA_PD
),
275 htons(sizeof(hdr_ia_pd
) - 4 +
276 sizeof(struct dhcpv6_ia_prefix
) * !!request_prefixes
[i
].length
),
277 request_prefixes
[i
].iaid
, 0, 0
279 struct dhcpv6_ia_prefix pref
= {
280 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
281 .len
= htons(sizeof(pref
) - 4),
282 .prefix
= request_prefixes
[i
].length
284 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
285 ia_pd_len
+= sizeof(hdr_ia_pd
);
286 if (request_prefixes
[i
].length
) {
287 memcpy(ia_pd
+ ia_pd_len
, &pref
, sizeof(pref
));
288 ia_pd_len
+= sizeof(pref
);
292 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
293 ia_pd_entries
/= sizeof(*e
);
295 // we're too lazy to count our distinct IAIDs,
296 // so just allocate maximally needed space
297 ia_pd
= alloca(ia_pd_entries
* (sizeof(struct dhcpv6_ia_prefix
) + 10 +
298 sizeof(struct dhcpv6_ia_hdr
)));
300 for (size_t i
= 0; i
< ia_pd_entries
; ++i
) {
301 uint32_t iaid
= e
[i
].iaid
;
303 // check if this is an unprocessed IAID and skip if not.
305 for (int j
= i
-1; j
>= 0; j
--) {
306 if (e
[j
].iaid
== iaid
) {
316 struct dhcpv6_ia_hdr hdr_ia_pd
= {
317 htons(DHCPV6_OPT_IA_PD
),
318 htons(sizeof(hdr_ia_pd
) - 4),
322 memcpy(ia_pd
+ ia_pd_len
, &hdr_ia_pd
, sizeof(hdr_ia_pd
));
323 struct dhcpv6_ia_hdr
*hdr
= (struct dhcpv6_ia_hdr
*) (ia_pd
+ ia_pd_len
);
324 ia_pd_len
+= sizeof(hdr_ia_pd
);
326 for (size_t j
= i
; j
< ia_pd_entries
; j
++) {
327 if (e
[j
].iaid
!= iaid
)
331 if (e
[j
].priority
> 0)
332 ex_len
= ((e
[j
].priority
- e
[j
].length
- 1) / 8) + 6;
334 struct dhcpv6_ia_prefix p
= {
335 .type
= htons(DHCPV6_OPT_IA_PREFIX
),
336 .len
= htons(sizeof(p
) - 4U + ex_len
),
337 .prefix
= e
[j
].length
,
341 if (type
== DHCPV6_MSG_REQUEST
) {
342 p
.preferred
= htonl(e
[j
].preferred
);
343 p
.valid
= htonl(e
[j
].valid
);
346 memcpy(ia_pd
+ ia_pd_len
, &p
, sizeof(p
));
347 ia_pd_len
+= sizeof(p
);
350 ia_pd
[ia_pd_len
++] = 0;
351 ia_pd
[ia_pd_len
++] = DHCPV6_OPT_PD_EXCLUDE
;
352 ia_pd
[ia_pd_len
++] = 0;
353 ia_pd
[ia_pd_len
++] = ex_len
- 4;
354 ia_pd
[ia_pd_len
++] = e
[j
].priority
;
356 uint32_t excl
= ntohl(e
[j
].router
.s6_addr32
[1]);
357 excl
>>= (64 - e
[j
].priority
);
358 excl
<<= 8 - ((e
[j
].priority
- e
[j
].length
) % 8);
360 for (size_t i
= ex_len
- 5; i
> 0; --i
, excl
>>= 8)
361 ia_pd
[ia_pd_len
+ i
] = excl
& 0xff;
362 ia_pd_len
+= ex_len
- 5;
365 hdr
->len
= htons(ntohs(hdr
->len
) + ntohs(p
.len
) + 4U);
370 if (ia_pd_entries
> 0)
374 size_t ia_na_entries
, ia_na_len
= 0;
376 struct odhcp6c_entry
*e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
377 ia_na_entries
/= sizeof(*e
);
379 struct dhcpv6_ia_hdr hdr_ia_na
= {
380 htons(DHCPV6_OPT_IA_NA
),
381 htons(sizeof(hdr_ia_na
) - 4),
385 struct dhcpv6_ia_addr pa
[ia_na_entries
];
386 for (size_t i
= 0; i
< ia_na_entries
; ++i
) {
387 pa
[i
].type
= htons(DHCPV6_OPT_IA_ADDR
);
388 pa
[i
].len
= htons(sizeof(pa
[i
]) - 4U);
389 pa
[i
].addr
= e
[i
].target
;
391 if (type
== DHCPV6_MSG_REQUEST
) {
392 pa
[i
].preferred
= htonl(e
[i
].preferred
);
393 pa
[i
].valid
= htonl(e
[i
].valid
);
401 ia_na_len
= sizeof(pa
);
402 hdr_ia_na
.len
= htons(ntohs(hdr_ia_na
.len
) + ia_na_len
);
404 // Reconfigure Accept
408 } reconf_accept
= {htons(DHCPV6_OPT_RECONF_ACCEPT
), 0};
410 // Request Information Refresh
411 uint16_t oro_refresh
= htons(DHCPV6_OPT_INFO_REFRESH
);
413 // Build vendor-class option
414 size_t vendor_class_len
, user_class_len
;
415 struct dhcpv6_vendorclass
*vendor_class
= odhcp6c_get_state(STATE_VENDORCLASS
, &vendor_class_len
);
416 void *user_class
= odhcp6c_get_state(STATE_USERCLASS
, &user_class_len
);
421 } vendor_class_hdr
= {htons(DHCPV6_OPT_VENDOR_CLASS
), htons(vendor_class_len
)};
426 } user_class_hdr
= {htons(DHCPV6_OPT_USER_CLASS
), htons(user_class_len
)};
430 void *oro
= odhcp6c_get_state(STATE_ORO
, &oro_len
);
434 uint16_t elapsed_type
;
435 uint16_t elapsed_len
;
436 uint16_t elapsed_value
;
440 type
, {trid
[0], trid
[1], trid
[2]},
441 htons(DHCPV6_OPT_ELAPSED
), htons(2),
442 htons((ecs
> 0xffff) ? 0xffff : ecs
),
443 htons(DHCPV6_OPT_ORO
), htons(oro_len
),
446 struct iovec iov
[IOV_TOTAL
] = {
447 [IOV_HDR
] = {&hdr
, sizeof(hdr
)},
448 [IOV_ORO
] = {oro
, oro_len
},
449 [IOV_ORO_REFRESH
] = {&oro_refresh
, 0},
450 [IOV_CL_ID
] = {cl_id
, cl_id_len
},
451 [IOV_SRV_ID
] = {srv_id
, srv_id_len
},
452 [IOV_VENDOR_CLASS_HDR
] = {&vendor_class_hdr
, vendor_class_len
? sizeof(vendor_class_hdr
) : 0},
453 [IOV_VENDOR_CLASS
] = {vendor_class
, vendor_class_len
},
454 [IOV_USER_CLASS_HDR
] = {&user_class_hdr
, user_class_len
? sizeof(user_class_hdr
) : 0},
455 [IOV_USER_CLASS
] = {user_class
, user_class_len
},
456 [IOV_RECONF_ACCEPT
] = {&reconf_accept
, sizeof(reconf_accept
)},
457 [IOV_FQDN
] = {&fqdn
, fqdn_len
},
458 [IOV_HDR_IA_NA
] = {&hdr_ia_na
, sizeof(hdr_ia_na
)},
459 [IOV_IA_NA
] = {ia_na
, ia_na_len
},
460 [IOV_IA_PD
] = {ia_pd
, ia_pd_len
},
463 size_t cnt
= IOV_TOTAL
;
464 if (type
== DHCPV6_MSG_INFO_REQ
) {
466 iov
[IOV_ORO_REFRESH
].iov_len
= sizeof(oro_refresh
);
467 hdr
.oro_len
= htons(oro_len
+ sizeof(oro_refresh
));
468 } else if (!request_prefix
) {
472 // Disable IAs if not used
473 if (type
!= DHCPV6_MSG_SOLICIT
&& ia_na_len
== 0)
474 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
476 if (na_mode
== IA_MODE_NONE
)
477 iov
[IOV_HDR_IA_NA
].iov_len
= 0;
479 if ((type
!= DHCPV6_MSG_SOLICIT
&& type
!= DHCPV6_MSG_REQUEST
) ||
480 !(client_options
& DHCPV6_ACCEPT_RECONFIGURE
))
481 iov
[IOV_RECONF_ACCEPT
].iov_len
= 0;
483 if (!(client_options
& DHCPV6_CLIENT_FQDN
))
484 iov
[IOV_FQDN
].iov_len
= 0;
486 struct sockaddr_in6 srv
= {AF_INET6
, htons(DHCPV6_SERVER_PORT
),
487 0, ALL_DHCPV6_RELAYS
, ifindex
};
488 struct msghdr msg
= {.msg_name
= &srv
, .msg_namelen
= sizeof(srv
),
489 .msg_iov
= iov
, .msg_iovlen
= cnt
};
491 sendmsg(sock
, &msg
, 0);
495 static int64_t dhcpv6_rand_delay(int64_t time
)
498 odhcp6c_random(&random
, sizeof(random
));
499 return (time
* ((int64_t)random
% 1000LL)) / 10000LL;
503 int dhcpv6_request(enum dhcpv6_msg type
)
506 uint64_t timeout
= UINT32_MAX
;
507 struct dhcpv6_retx
*retx
= &dhcpv6_retx
[type
];
510 struct timespec ts
= {0, 0};
511 ts
.tv_nsec
= (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY
) / 2) + (1000 * DHCPV6_REQ_DELAY
) / 2) * 1000000;
512 while (nanosleep(&ts
, &ts
) < 0 && errno
== EINTR
);
515 if (type
== DHCPV6_MSG_UNKNOWN
)
517 else if (type
== DHCPV6_MSG_RENEW
)
518 timeout
= (t2
> t1
) ? t2
- t1
: ((t1
== UINT32_MAX
) ? UINT32_MAX
: 0);
519 else if (type
== DHCPV6_MSG_REBIND
)
520 timeout
= (t3
> t2
) ? t3
- t2
: ((t2
== UINT32_MAX
) ? UINT32_MAX
: 0);
525 syslog(LOG_NOTICE
, "Starting %s transaction (timeout %llus, max rc %d)",
526 retx
->name
, (unsigned long long)timeout
, retx
->max_rc
);
528 uint64_t start
= odhcp6c_get_milli_time(), round_start
= start
, elapsed
;
530 // Generate transaction ID
531 uint8_t trid
[3] = {0, 0, 0};
532 if (type
!= DHCPV6_MSG_UNKNOWN
)
533 odhcp6c_random(trid
, sizeof(trid
));
539 int64_t delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
541 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
542 while (type
== DHCPV6_MSG_SOLICIT
&& delay
<= 0)
543 delay
= dhcpv6_rand_delay(retx
->init_timeo
* 1000);
545 rto
= (retx
->init_timeo
* 1000 + delay
);
548 rto
= (2 * rto
+ dhcpv6_rand_delay(rto
));
550 if (retx
->max_timeo
&& (rto
>= retx
->max_timeo
* 1000))
551 rto
= retx
->max_timeo
* 1000 +
552 dhcpv6_rand_delay(retx
->max_timeo
* 1000);
554 // Calculate end for this round and elapsed time
555 uint64_t round_end
= round_start
+ rto
;
556 elapsed
= round_start
- start
;
558 // Don't wait too long if timeout differs from infinite
559 if ((timeout
!= UINT32_MAX
) && (round_end
- start
> timeout
* 1000))
560 round_end
= timeout
* 1000 + start
;
562 // Built and send package
564 case DHCPV6_MSG_UNKNOWN
:
567 syslog(LOG_NOTICE
, "Send %s message (elapsed %llums, rc %d)",
568 retx
->name
, (unsigned long long)elapsed
, rc
);
570 case DHCPV6_MSG_SOLICIT
:
571 case DHCPV6_MSG_INFO_REQ
:
572 dhcpv6_send(type
, trid
, elapsed
/ 10);
577 for (; len
< 0 && (round_start
< round_end
);
578 round_start
= odhcp6c_get_milli_time()) {
579 uint8_t buf
[1536], cmsg_buf
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
580 struct iovec iov
= {buf
, sizeof(buf
)};
581 struct sockaddr_in6 addr
;
582 struct msghdr msg
= {.msg_name
= &addr
, .msg_namelen
= sizeof(addr
),
583 .msg_iov
= &iov
, .msg_iovlen
= 1, .msg_control
= cmsg_buf
,
584 .msg_controllen
= sizeof(cmsg_buf
)};
585 struct in6_pktinfo
*pktinfo
= NULL
;
588 // Check for pending signal
589 if (odhcp6c_signal_process())
592 // Set timeout for receiving
593 uint64_t t
= round_end
- round_start
;
594 struct timeval tv
= {t
/ 1000, (t
% 1000) * 1000};
595 setsockopt(sock
, SOL_SOCKET
, SO_RCVTIMEO
,
599 len
= recvmsg(sock
, &msg
, 0);
603 for (struct cmsghdr
*ch
= CMSG_FIRSTHDR(&msg
); ch
!= NULL
;
604 ch
= CMSG_NXTHDR(&msg
, ch
)) {
605 if (ch
->cmsg_level
== SOL_IPV6
&&
606 ch
->cmsg_type
== IPV6_PKTINFO
) {
607 pktinfo
= (struct in6_pktinfo
*)CMSG_DATA(ch
);
612 if (pktinfo
== NULL
) {
617 if (!dhcpv6_response_is_valid(buf
, len
, trid
,
618 type
, &pktinfo
->ipi6_addr
)) {
623 uint8_t *opt
= &buf
[4];
624 uint8_t *opt_end
= opt
+ len
- 4;
626 round_start
= odhcp6c_get_milli_time();
627 elapsed
= round_start
- start
;
628 syslog(LOG_NOTICE
, "Got a valid reply after "
629 "%llums", (unsigned long long)elapsed
);
631 if (retx
->handler_reply
)
632 len
= retx
->handler_reply(type
, rc
, opt
, opt_end
, &addr
);
634 if (len
> 0 && round_end
- round_start
> 1000)
635 round_end
= 1000 + round_start
;
639 if (retx
->handler_finish
)
640 len
= retx
->handler_finish();
641 } while (len
< 0 && ((timeout
== UINT32_MAX
) || (elapsed
/ 1000 < timeout
)) &&
642 (!retx
->max_rc
|| rc
< retx
->max_rc
));
646 // Message validation checks according to RFC3315 chapter 15
647 static bool dhcpv6_response_is_valid(const void *buf
, ssize_t len
,
648 const uint8_t transaction
[3], enum dhcpv6_msg type
,
649 const struct in6_addr
*daddr
)
651 const struct dhcpv6_header
*rep
= buf
;
652 if (len
< (ssize_t
)sizeof(*rep
) || memcmp(rep
->tr_id
,
653 transaction
, sizeof(rep
->tr_id
)))
654 return false; // Invalid reply
656 if (type
== DHCPV6_MSG_SOLICIT
) {
657 if (rep
->msg_type
!= DHCPV6_MSG_ADVERT
&&
658 rep
->msg_type
!= DHCPV6_MSG_REPLY
)
660 } else if (type
== DHCPV6_MSG_UNKNOWN
) {
661 if (!accept_reconfig
|| rep
->msg_type
!= DHCPV6_MSG_RECONF
)
663 } else if (rep
->msg_type
!= DHCPV6_MSG_REPLY
) {
667 uint8_t *end
= ((uint8_t*)buf
) + len
, *odata
= NULL
,
668 rcmsg
= DHCPV6_MSG_UNKNOWN
;
669 uint16_t otype
, olen
= UINT16_MAX
;
670 bool clientid_ok
= false, serverid_ok
= false, rcauth_ok
= false,
671 ia_present
= false, options_valid
= true;
673 size_t client_id_len
, server_id_len
;
674 void *client_id
= odhcp6c_get_state(STATE_CLIENT_ID
, &client_id_len
);
675 void *server_id
= odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
677 dhcpv6_for_each_option(&rep
[1], end
, otype
, olen
, odata
) {
678 if (otype
== DHCPV6_OPT_CLIENTID
) {
679 clientid_ok
= (olen
+ 4U == client_id_len
) && !memcmp(
680 &odata
[-4], client_id
, client_id_len
);
681 } else if (otype
== DHCPV6_OPT_SERVERID
) {
683 serverid_ok
= (olen
+ 4U == server_id_len
) && !memcmp(
684 &odata
[-4], server_id
, server_id_len
);
687 } else if (otype
== DHCPV6_OPT_AUTH
&& olen
== -4 +
688 sizeof(struct dhcpv6_auth_reconfigure
)) {
689 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
690 if (r
->protocol
!= 3 || r
->algorithm
!= 1 || r
->reconf_type
!= 2)
694 uint8_t serverhash
[16], secretbytes
[64], hash
[16];
695 memcpy(serverhash
, r
->key
, sizeof(serverhash
));
696 memset(r
->key
, 0, sizeof(r
->key
));
698 memset(secretbytes
, 0, sizeof(secretbytes
));
699 memcpy(secretbytes
, reconf_key
, sizeof(reconf_key
));
701 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
)
702 secretbytes
[i
] ^= 0x36;
705 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
706 md5_hash(buf
, len
, &md5
);
709 for (size_t i
= 0; i
< sizeof(secretbytes
); ++i
) {
710 secretbytes
[i
] ^= 0x36;
711 secretbytes
[i
] ^= 0x5c;
715 md5_hash(secretbytes
, sizeof(secretbytes
), &md5
);
716 md5_hash(hash
, 16, &md5
);
719 rcauth_ok
= !memcmp(hash
, serverhash
, sizeof(hash
));
720 } else if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1) {
722 } else if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)) {
724 if (olen
< -4 + sizeof(struct dhcpv6_ia_hdr
))
725 options_valid
= false;
727 else if ((otype
== DHCPV6_OPT_IA_ADDR
) || (otype
== DHCPV6_OPT_IA_PREFIX
) ||
728 (otype
== DHCPV6_OPT_PD_EXCLUDE
)) {
729 // Options are not allowed on global level
730 options_valid
= false;
734 if (!options_valid
|| ((odata
+ olen
) > end
))
737 if (type
== DHCPV6_MSG_INFO_REQ
&& ia_present
)
740 if (rep
->msg_type
== DHCPV6_MSG_RECONF
) {
741 if ((rcmsg
!= DHCPV6_MSG_RENEW
&& rcmsg
!= DHCPV6_MSG_INFO_REQ
) ||
742 (rcmsg
== DHCPV6_MSG_INFO_REQ
&& ia_present
) ||
743 !rcauth_ok
|| IN6_IS_ADDR_MULTICAST(daddr
))
747 return clientid_ok
&& serverid_ok
;
751 int dhcpv6_poll_reconfigure(void)
753 int ret
= dhcpv6_request(DHCPV6_MSG_UNKNOWN
);
755 ret
= dhcpv6_request(ret
);
761 static int dhcpv6_handle_reconfigure(_unused
enum dhcpv6_msg orig
, const int rc
,
762 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
764 uint16_t otype
, olen
;
765 uint8_t *odata
, msg
= DHCPV6_MSG_RENEW
;
766 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
)
767 if (otype
== DHCPV6_OPT_RECONF_MESSAGE
&& olen
== 1 && (
768 odata
[0] == DHCPV6_MSG_RENEW
||
769 odata
[0] == DHCPV6_MSG_INFO_REQ
))
772 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN
, rc
, NULL
, NULL
, NULL
);
777 // Collect all advertised servers
778 static int dhcpv6_handle_advert(enum dhcpv6_msg orig
, const int rc
,
779 const void *opt
, const void *end
, _unused
const struct sockaddr_in6
*from
)
781 uint16_t olen
, otype
;
782 uint8_t *odata
, pref
= 0;
783 struct dhcpv6_server_cand cand
= {false, false, 0, 0, {0},
785 DHCPV6_INF_MAX_RT
, NULL
, NULL
, 0, 0};
786 bool have_na
= false;
789 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
790 if (orig
== DHCPV6_MSG_SOLICIT
&&
791 (otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
) &&
792 olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
793 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
794 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
797 if (otype
== DHCPV6_OPT_SERVERID
&& olen
<= 130) {
798 memcpy(cand
.duid
, odata
, olen
);
799 cand
.duid_len
= olen
;
800 } else if (otype
== DHCPV6_OPT_PREF
&& olen
>= 1 &&
801 cand
.preference
>= 0) {
802 cand
.preference
= pref
= odata
[0];
803 } else if (otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
804 cand
.wants_reconfigure
= true;
805 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
806 uint32_t sol_max_rt
= ntohl(*((uint32_t *)odata
));
807 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
808 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
809 cand
.sol_max_rt
= sol_max_rt
;
810 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
811 uint32_t inf_max_rt
= ntohl(*((uint32_t *)odata
));
812 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
813 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
814 cand
.inf_max_rt
= inf_max_rt
;
815 } else if (otype
== DHCPV6_OPT_IA_PD
&& request_prefix
) {
816 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
817 uint8_t *oend
= odata
+ olen
, *d
;
818 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
) {
819 if (otype
== DHCPV6_OPT_IA_PREFIX
&&
820 olen
>= -4 + sizeof(struct dhcpv6_ia_prefix
)) {
821 struct dhcpv6_ia_prefix
*p
= (struct dhcpv6_ia_prefix
*)&d
[-4];
825 } else if (otype
== DHCPV6_OPT_IA_NA
) {
826 struct dhcpv6_ia_hdr
*h
= (struct dhcpv6_ia_hdr
*)&odata
[-4];
827 uint8_t *oend
= odata
+ olen
, *d
;
828 dhcpv6_for_each_option(&h
[1], oend
, otype
, olen
, d
)
829 if (otype
== DHCPV6_OPT_IA_ADDR
&&
830 olen
>= -4 + sizeof(struct dhcpv6_ia_addr
))
835 if ((!have_na
&& na_mode
== IA_MODE_FORCE
) ||
836 (!have_pd
&& pd_mode
== IA_MODE_FORCE
)) {
838 * RFC7083 states to process the SOL_MAX_RT and
839 * INF_MAX_RT options even if the DHCPv6 server
840 * did not propose any IA_NA and/or IA_PD
842 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
.sol_max_rt
;
843 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
.inf_max_rt
;
847 if (na_mode
!= IA_MODE_NONE
&& !have_na
) {
848 cand
.has_noaddravail
= true;
849 cand
.preference
-= 1000;
852 if (pd_mode
!= IA_MODE_NONE
) {
854 cand
.preference
+= 2000 + (128 - have_pd
);
856 cand
.preference
-= 2000;
859 if (cand
.duid_len
> 0) {
860 cand
.ia_na
= odhcp6c_move_state(STATE_IA_NA
, &cand
.ia_na_len
);
861 cand
.ia_pd
= odhcp6c_move_state(STATE_IA_PD
, &cand
.ia_pd_len
);
862 dhcpv6_add_server_cand(&cand
);
865 return (rc
> 1 || (pref
== 255 && cand
.preference
> 0)) ? 1 : -1;
869 static int dhcpv6_commit_advert(void)
871 return dhcpv6_promote_server_cand();
875 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig
, const int rc
,
876 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
878 dhcpv6_handle_advert(orig
, rc
, opt
, end
, from
);
879 if (dhcpv6_commit_advert() < 0)
882 return dhcpv6_handle_reply(orig
, rc
, opt
, end
, from
);
886 static int dhcpv6_handle_reply(enum dhcpv6_msg orig
, _unused
const int rc
,
887 const void *opt
, const void *end
, const struct sockaddr_in6
*from
)
890 uint16_t otype
, olen
;
891 uint32_t refresh
= 86400;
893 bool handled_status_codes
[_DHCPV6_Status_Max
] = { false, };
897 if (orig
== DHCPV6_MSG_UNKNOWN
) {
898 static time_t last_update
= 0;
899 time_t now
= odhcp6c_get_milli_time() / 1000;
901 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
904 if (t1
!= UINT32_MAX
)
907 if (t2
!= UINT32_MAX
)
910 if (t3
!= UINT32_MAX
)
923 if (orig
== DHCPV6_MSG_REQUEST
&& !odhcp6c_is_bound()) {
924 // Delete NA and PD we have in the state from the Advert
925 odhcp6c_clear_state(STATE_IA_NA
);
926 odhcp6c_clear_state(STATE_IA_PD
);
930 odhcp6c_clear_state(STATE_DNS
);
931 odhcp6c_clear_state(STATE_SEARCH
);
932 odhcp6c_clear_state(STATE_SNTP_IP
);
933 odhcp6c_clear_state(STATE_NTP_IP
);
934 odhcp6c_clear_state(STATE_NTP_FQDN
);
935 odhcp6c_clear_state(STATE_SIP_IP
);
936 odhcp6c_clear_state(STATE_SIP_FQDN
);
937 odhcp6c_clear_state(STATE_AFTR_NAME
);
938 odhcp6c_clear_state(STATE_CER
);
939 odhcp6c_clear_state(STATE_S46_MAPT
);
940 odhcp6c_clear_state(STATE_S46_MAPE
);
941 odhcp6c_clear_state(STATE_S46_LW
);
942 odhcp6c_clear_state(STATE_PASSTHRU
);
943 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);
945 // Parse and find all matching IAs
946 dhcpv6_for_each_option(opt
, end
, otype
, olen
, odata
) {
947 bool passthru
= true;
949 if ((otype
== DHCPV6_OPT_IA_PD
|| otype
== DHCPV6_OPT_IA_NA
)
950 && olen
> -4 + sizeof(struct dhcpv6_ia_hdr
)) {
951 struct dhcpv6_ia_hdr
*ia_hdr
= (void*)(&odata
[-4]);
953 if ((na_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_NA
) ||
954 (pd_mode
== IA_MODE_NONE
&& otype
== DHCPV6_OPT_IA_PD
))
958 if (ia_hdr
->iaid
!= htonl(1) && otype
== DHCPV6_OPT_IA_NA
)
961 uint16_t code
= DHCPV6_Success
;
962 uint16_t stype
, slen
;
964 // Get and handle status code
965 dhcpv6_for_each_option(&ia_hdr
[1], odata
+ olen
,
966 stype
, slen
, sdata
) {
967 if (stype
== DHCPV6_OPT_STATUS
&& slen
>= 2) {
968 uint8_t *mdata
= (slen
> 2) ? &sdata
[2] : NULL
;
969 uint16_t mlen
= (slen
> 2) ? slen
- 2 : 0;
971 code
= ((int)sdata
[0]) << 8 | ((int)sdata
[1]);
973 if (code
== DHCPV6_Success
)
976 dhcpv6_handle_ia_status_code(orig
, ia_hdr
,
977 code
, mdata
, mlen
, handled_status_codes
, &ret
);
986 if (code
!= DHCPV6_Success
)
989 dhcpv6_parse_ia(ia_hdr
, odata
+ olen
+ sizeof(*ia_hdr
));
991 } else if (otype
== DHCPV6_OPT_STATUS
&& olen
>= 2) {
992 uint8_t *mdata
= (olen
> 2) ? &odata
[2] : NULL
;
993 uint16_t mlen
= (olen
> 2) ? olen
- 2 : 0;
994 uint16_t code
= ((int)odata
[0]) << 8 | ((int)odata
[1]);
996 dhcpv6_handle_status_code(orig
, code
, mdata
, mlen
, &ret
);
999 else if (otype
== DHCPV6_OPT_DNS_SERVERS
) {
1001 odhcp6c_add_state(STATE_DNS
, odata
, olen
);
1002 } else if (otype
== DHCPV6_OPT_DNS_DOMAIN
) {
1003 odhcp6c_add_state(STATE_SEARCH
, odata
, olen
);
1004 } else if (otype
== DHCPV6_OPT_SNTP_SERVERS
) {
1006 odhcp6c_add_state(STATE_SNTP_IP
, odata
, olen
);
1007 } else if (otype
== DHCPV6_OPT_NTP_SERVER
) {
1008 uint16_t stype
, slen
;
1010 // Test status and bail if error
1011 dhcpv6_for_each_option(odata
, odata
+ olen
,
1012 stype
, slen
, sdata
) {
1013 if (slen
== 16 && (stype
== NTP_MC_ADDR
||
1014 stype
== NTP_SRV_ADDR
))
1015 odhcp6c_add_state(STATE_NTP_IP
,
1017 else if (slen
> 0 && stype
== NTP_SRV_FQDN
)
1018 odhcp6c_add_state(STATE_NTP_FQDN
,
1021 } else if (otype
== DHCPV6_OPT_SIP_SERVER_A
) {
1023 odhcp6c_add_state(STATE_SIP_IP
, odata
, olen
);
1024 } else if (otype
== DHCPV6_OPT_SIP_SERVER_D
) {
1025 odhcp6c_add_state(STATE_SIP_FQDN
, odata
, olen
);
1026 } else if (otype
== DHCPV6_OPT_INFO_REFRESH
&& olen
>= 4) {
1027 refresh
= ntohl(*((uint32_t*)odata
));
1029 } else if (otype
== DHCPV6_OPT_AUTH
) {
1030 if (olen
== -4 + sizeof(struct dhcpv6_auth_reconfigure
)) {
1031 struct dhcpv6_auth_reconfigure
*r
= (void*)&odata
[-4];
1032 if (r
->protocol
== 3 && r
->algorithm
== 1 &&
1033 r
->reconf_type
== 1)
1034 memcpy(reconf_key
, r
->key
, sizeof(r
->key
));
1037 } else if (otype
== DHCPV6_OPT_AFTR_NAME
&& olen
> 3) {
1039 odhcp6c_get_state(STATE_AFTR_NAME
, &cur_len
);
1041 odhcp6c_add_state(STATE_AFTR_NAME
, odata
, olen
);
1043 } else if (otype
== DHCPV6_OPT_SOL_MAX_RT
&& olen
== 4) {
1044 uint32_t sol_max_rt
= ntohl(*((uint32_t *)odata
));
1045 if (sol_max_rt
>= DHCPV6_SOL_MAX_RT_MIN
&&
1046 sol_max_rt
<= DHCPV6_SOL_MAX_RT_MAX
)
1047 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= sol_max_rt
;
1049 } else if (otype
== DHCPV6_OPT_INF_MAX_RT
&& olen
== 4) {
1050 uint32_t inf_max_rt
= ntohl(*((uint32_t *)odata
));
1051 if (inf_max_rt
>= DHCPV6_INF_MAX_RT_MIN
&&
1052 inf_max_rt
<= DHCPV6_INF_MAX_RT_MAX
)
1053 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= inf_max_rt
;
1056 } else if (otype
== DHCPV6_OPT_CER_ID
&& olen
== -4 +
1057 sizeof(struct dhcpv6_cer_id
)) {
1058 struct dhcpv6_cer_id
*cer_id
= (void*)&odata
[-4];
1059 struct in6_addr any
= IN6ADDR_ANY_INIT
;
1060 if (memcmp(&cer_id
->addr
, &any
, sizeof(any
)))
1061 odhcp6c_add_state(STATE_CER
, &cer_id
->addr
, sizeof(any
));
1064 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPT
) {
1065 odhcp6c_add_state(STATE_S46_MAPT
, odata
, olen
);
1067 } else if (otype
== DHCPV6_OPT_S46_CONT_MAPE
) {
1069 odhcp6c_get_state(STATE_S46_MAPE
, &mape_len
);
1071 odhcp6c_add_state(STATE_S46_MAPE
, odata
, olen
);
1073 } else if (otype
== DHCPV6_OPT_S46_CONT_LW
) {
1074 odhcp6c_add_state(STATE_S46_LW
, odata
, olen
);
1076 } else if (otype
== DHCPV6_OPT_CLIENTID
||
1077 otype
== DHCPV6_OPT_SERVERID
||
1078 otype
== DHCPV6_OPT_IA_TA
||
1079 otype
== DHCPV6_OPT_PREF
||
1080 otype
== DHCPV6_OPT_UNICAST
||
1081 otype
== DHCPV6_OPT_FQDN
||
1082 otype
== DHCPV6_OPT_RECONF_ACCEPT
) {
1085 odhcp6c_add_state(STATE_CUSTOM_OPTS
, &odata
[-4], olen
+ 4);
1089 odhcp6c_add_state(STATE_PASSTHRU
, &odata
[-4], olen
+ 4);
1093 if (orig
!= DHCPV6_MSG_INFO_REQ
) {
1094 // Update refresh timers if no fatal status code was received
1095 if ((ret
> 0) && dhcpv6_calc_refresh_timers()) {
1097 case DHCPV6_MSG_RENEW
:
1098 // Send further renews if T1 is not set
1102 case DHCPV6_MSG_REBIND
:
1103 // Send further rebinds if T1 and T2 is not set
1108 case DHCPV6_MSG_REQUEST
:
1109 // All server candidates can be cleared if not yet bound
1110 if (!odhcp6c_is_bound())
1111 dhcpv6_clear_all_server_cand();
1117 if (orig
== DHCPV6_MSG_REBIND
|| orig
== DHCPV6_MSG_REQUEST
) {
1118 odhcp6c_clear_state(STATE_SERVER_ADDR
);
1119 odhcp6c_add_state(STATE_SERVER_ADDR
, &from
->sin6_addr
, 16);
1124 // All server candidates can be cleared if not yet bound
1125 if (!odhcp6c_is_bound())
1126 dhcpv6_clear_all_server_cand();
1135 static int dhcpv6_parse_ia(void *opt
, void *end
)
1137 struct dhcpv6_ia_hdr
*ia_hdr
= (struct dhcpv6_ia_hdr
*)opt
;
1140 uint16_t otype
, olen
;
1143 t1
= ntohl(ia_hdr
->t1
);
1144 t2
= ntohl(ia_hdr
->t2
);
1149 // Update address IA
1150 dhcpv6_for_each_option(&ia_hdr
[1], end
, otype
, olen
, odata
) {
1151 struct odhcp6c_entry entry
= {IN6ADDR_ANY_INIT
, 0, 0, 0,
1152 IN6ADDR_ANY_INIT
, 0, 0, 0, 0, 0};
1154 entry
.iaid
= ia_hdr
->iaid
;
1156 if (otype
== DHCPV6_OPT_IA_PREFIX
) {
1157 struct dhcpv6_ia_prefix
*prefix
= (void*)&odata
[-4];
1158 if (olen
+ 4U < sizeof(*prefix
))
1161 entry
.valid
= ntohl(prefix
->valid
);
1162 entry
.preferred
= ntohl(prefix
->preferred
);
1164 if (entry
.preferred
> entry
.valid
)
1167 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1168 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1169 if (entry
.t1
> entry
.t2
)
1170 entry
.t1
= entry
.t2
;
1172 entry
.length
= prefix
->prefix
;
1173 entry
.target
= prefix
->addr
;
1174 uint16_t stype
, slen
;
1179 dhcpv6_for_each_option(odata
+ sizeof(*prefix
) - 4U,
1180 odata
+ olen
, stype
, slen
, sdata
) {
1181 if (stype
!= DHCPV6_OPT_PD_EXCLUDE
|| slen
< 2)
1184 uint8_t elen
= sdata
[0];
1188 if (elen
<= 32 || elen
<= entry
.length
) {
1194 uint8_t bytes
= ((elen
- entry
.length
- 1) / 8) + 1;
1195 if (slen
<= bytes
) {
1200 uint32_t exclude
= 0;
1202 exclude
= exclude
<< 8 | sdata
[bytes
];
1205 exclude
>>= 8 - ((elen
- entry
.length
) % 8);
1206 exclude
<<= 64 - elen
;
1208 // Abusing router & priority fields for exclusion
1209 entry
.router
= entry
.target
;
1210 entry
.router
.s6_addr32
[1] |= htonl(exclude
);
1211 entry
.priority
= elen
;
1215 odhcp6c_update_entry(STATE_IA_PD
, &entry
, 0, false);
1220 memset(&entry
.router
, 0, sizeof(entry
.router
));
1221 } else if (otype
== DHCPV6_OPT_IA_ADDR
) {
1222 struct dhcpv6_ia_addr
*addr
= (void*)&odata
[-4];
1223 if (olen
+ 4U < sizeof(*addr
))
1226 entry
.preferred
= ntohl(addr
->preferred
);
1227 entry
.valid
= ntohl(addr
->valid
);
1229 if (entry
.preferred
> entry
.valid
)
1232 entry
.t1
= (t1
? t1
: (entry
.preferred
!= UINT32_MAX
? 0.5 * entry
.preferred
: UINT32_MAX
));
1233 entry
.t2
= (t2
? t2
: (entry
.preferred
!= UINT32_MAX
? 0.8 * entry
.preferred
: UINT32_MAX
));
1234 if (entry
.t1
> entry
.t2
)
1235 entry
.t1
= entry
.t2
;
1238 entry
.target
= addr
->addr
;
1240 odhcp6c_update_entry(STATE_IA_NA
, &entry
, 0, false);
1248 static int dhcpv6_calc_refresh_timers(void)
1250 struct odhcp6c_entry
*e
;
1251 size_t ia_na_entries
, ia_pd_entries
, i
;
1252 int64_t l_t1
= UINT32_MAX
, l_t2
= UINT32_MAX
, l_t3
= 0;
1254 e
= odhcp6c_get_state(STATE_IA_NA
, &ia_na_entries
);
1255 ia_na_entries
/= sizeof(*e
);
1256 for (i
= 0; i
< ia_na_entries
; i
++) {
1263 if (e
[i
].valid
> l_t3
)
1267 e
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_entries
);
1268 ia_pd_entries
/= sizeof(*e
);
1269 for (i
= 0; i
< ia_pd_entries
; i
++) {
1276 if (e
[i
].valid
> l_t3
)
1280 if (ia_pd_entries
|| ia_na_entries
) {
1288 return (int)(ia_pd_entries
+ ia_na_entries
);
1292 static void dhcpv6_log_status_code(const uint16_t code
, const char *scope
,
1293 const void *status_msg
, const int len
)
1295 uint8_t buf
[len
+ 3];
1297 memset(buf
, 0, sizeof(buf
));
1300 memcpy(&buf
[1], status_msg
, len
);
1304 syslog(LOG_WARNING
, "Server returned %s status %i %s",
1309 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig
,
1310 const uint16_t code
, const void *status_msg
, const int len
,
1313 dhcpv6_log_status_code(code
, "message", status_msg
, len
);
1316 case DHCPV6_UnspecFail
:
1321 case DHCPV6_UseMulticast
:
1322 // TODO handle multicast status code
1325 case DHCPV6_NoAddrsAvail
:
1326 case DHCPV6_NoPrefixAvail
:
1327 if (orig
== DHCPV6_MSG_REQUEST
)
1328 *ret
= 0; // Failure
1337 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig
,
1338 const struct dhcpv6_ia_hdr
*ia_hdr
, const uint16_t code
,
1339 const void *status_msg
, const int len
,
1340 bool handled_status_codes
[_DHCPV6_Status_Max
], int *ret
)
1342 dhcpv6_log_status_code(code
, ia_hdr
->type
== DHCPV6_OPT_IA_NA
?
1343 "IA_NA" : "IA_PD", status_msg
, len
);
1346 case DHCPV6_NoBinding
:
1348 case DHCPV6_MSG_RENEW
:
1349 case DHCPV6_MSG_REBIND
:
1350 if ((*ret
> 0) && !handled_status_codes
[code
])
1351 *ret
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
1365 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand
*cand
)
1368 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1370 // Remove identical duid server candidate
1371 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1372 if (cand
->duid_len
== c
[i
].duid_len
&&
1373 !memcmp(cand
->duid
, c
[i
].duid
, cand
->duid_len
)) {
1376 odhcp6c_remove_state(STATE_SERVER_CAND
, i
* sizeof(*c
), sizeof(*c
));
1381 for (i
= 0, c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1382 i
< cand_len
/ sizeof(*c
); ++i
) {
1383 if (c
[i
].preference
< cand
->preference
)
1387 odhcp6c_insert_state(STATE_SERVER_CAND
, i
* sizeof(*c
), cand
, sizeof(*cand
));
1390 static void dhcpv6_clear_all_server_cand(void)
1393 struct dhcpv6_server_cand
*c
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1395 // Server candidates need deep delete for IA_NA/IA_PD
1396 for (i
= 0; i
< cand_len
/ sizeof(*c
); ++i
) {
1400 odhcp6c_clear_state(STATE_SERVER_CAND
);
1403 int dhcpv6_promote_server_cand(void)
1406 struct dhcpv6_server_cand
*cand
= odhcp6c_get_state(STATE_SERVER_CAND
, &cand_len
);
1408 int ret
= DHCPV6_STATELESS
;
1410 // Clear lingering candidate state info
1411 odhcp6c_clear_state(STATE_SERVER_ID
);
1412 odhcp6c_clear_state(STATE_IA_NA
);
1413 odhcp6c_clear_state(STATE_IA_PD
);
1418 if (cand
->has_noaddravail
&& na_mode
== IA_MODE_TRY
) {
1419 na_mode
= IA_MODE_NONE
;
1421 dhcpv6_retx
[DHCPV6_MSG_SOLICIT
].max_timeo
= cand
->sol_max_rt
;
1422 dhcpv6_retx
[DHCPV6_MSG_INFO_REQ
].max_timeo
= cand
->inf_max_rt
;
1424 return dhcpv6_request(DHCPV6_MSG_SOLICIT
);
1427 hdr
[0] = htons(DHCPV6_OPT_SERVERID
);
1428 hdr
[1] = htons(cand
->duid_len
);
1429 odhcp6c_add_state(STATE_SERVER_ID
, hdr
, sizeof(hdr
));
1430 odhcp6c_add_state(STATE_SERVER_ID
, cand
->duid
, cand
->duid_len
);
1431 accept_reconfig
= cand
->wants_reconfigure
;
1432 if (cand
->ia_na_len
) {
1433 odhcp6c_add_state(STATE_IA_NA
, cand
->ia_na
, cand
->ia_na_len
);
1435 if (na_mode
!= IA_MODE_NONE
)
1436 ret
= DHCPV6_STATEFUL
;
1438 if (cand
->ia_pd_len
) {
1439 odhcp6c_add_state(STATE_IA_PD
, cand
->ia_pd
, cand
->ia_pd_len
);
1442 ret
= DHCPV6_STATEFUL
;
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 odhcp6c_remove_state(STATE_SERVER_CAND
, 0, sizeof(*cand
));