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.
17 #include <netinet/in.h>
19 #define _unused __attribute__((unused))
20 #define _packed __attribute__((packed))
22 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
24 #define ND_OPT_RECURSIVE_DNS 25
25 #define ND_OPT_DNSSL 31
27 #define DHCPV6_SOL_MAX_RT 3600
28 #define DHCPV6_REQ_MAX_RT 30
29 #define DHCPV6_CNF_MAX_RT 4
30 #define DHCPV6_REN_MAX_RT 600
31 #define DHCPV6_REB_MAX_RT 600
32 #define DHCPV6_INF_MAX_RT 3600
34 #define DEFAULT_MIN_UPDATE_INTERVAL 30
37 DHCPV6_OPT_CLIENTID
= 1,
38 DHCPV6_OPT_SERVERID
= 2,
41 DHCPV6_OPT_IA_ADDR
= 5,
44 DHCPV6_OPT_ELAPSED
= 8,
45 DHCPV6_OPT_RELAY_MSG
= 9,
47 DHCPV6_OPT_UNICAST
= 12,
48 DHCPV6_OPT_STATUS
= 13,
49 DHCPV6_OPT_RAPID_COMMIT
= 14,
50 DHCPV6_OPT_USER_CLASS
= 15,
51 DHCPV6_OPT_VENDOR_CLASS
= 16,
52 DHCPV6_OPT_RECONF_MESSAGE
= 19,
53 DHCPV6_OPT_RECONF_ACCEPT
= 20,
54 DHCPV6_OPT_DNS_SERVERS
= 23,
55 DHCPV6_OPT_DNS_DOMAIN
= 24,
56 DHCPV6_OPT_IA_PD
= 25,
57 DHCPV6_OPT_IA_PREFIX
= 26,
58 DHCPV6_OPT_SNTP_SERVERS
= 31,
59 DHCPV6_OPT_INFO_REFRESH
= 32,
61 DHCPV6_OPT_NTP_SERVER
= 56,
62 DHCPV6_OPT_SIP_SERVER_D
= 21,
63 DHCPV6_OPT_SIP_SERVER_A
= 22,
64 DHCPV6_OPT_AFTR_NAME
= 64,
65 DHCPV6_OPT_PD_EXCLUDE
= 67,
66 DHCPV6_OPT_SOL_MAX_RT
= 82,
67 DHCPV6_OPT_INF_MAX_RT
= 83,
68 #ifdef EXT_PREFIX_CLASS
69 /* draft-bhandari-dhc-class-based-prefix, not yet standardized */
70 DHCPV6_OPT_PREFIX_CLASS
= EXT_PREFIX_CLASS
,
73 /* draft-donley-dhc-cer-id-option-03 */
74 DHCPV6_OPT_CER_ID
= EXT_CER_ID
,
76 /* draft-ietf-softwire-map-dhcp-08 */
77 DHCPV6_OPT_S46_RULE
= 89,
78 DHCPV6_OPT_S46_BR
= 90,
79 DHCPV6_OPT_S46_DMR
= 91,
80 DHCPV6_OPT_S46_V4V6BIND
= 92,
81 DHCPV6_OPT_S46_PORTPARAMS
= 93,
82 DHCPV6_OPT_S46_CONT_MAPE
= 94,
83 DHCPV6_OPT_S46_CONT_MAPT
= 95,
84 DHCPV6_OPT_S46_CONT_LW
= 96,
94 DHCPV6_MSG_UNKNOWN
= 0,
95 DHCPV6_MSG_SOLICIT
= 1,
96 DHCPV6_MSG_ADVERT
= 2,
97 DHCPV6_MSG_REQUEST
= 3,
99 DHCPV6_MSG_REBIND
= 6,
100 DHCPV6_MSG_REPLY
= 7,
101 DHCPV6_MSG_RELEASE
= 8,
102 DHCPV6_MSG_DECLINE
= 9,
103 DHCPV6_MSG_RECONF
= 10,
104 DHCPV6_MSG_INFO_REQ
= 11,
110 DHCPV6_UnspecFail
= 1,
111 DHCPV6_NoAddrsAvail
= 2,
112 DHCPV6_NoBinding
= 3,
113 DHCPV6_NotOnLink
= 4,
114 DHCPV6_UseMulticast
= 5,
115 DHCPV6_NoPrefixAvail
= 6,
120 DHCPV6_STRICT_OPTIONS
= 1,
121 DHCPV6_CLIENT_FQDN
= 2,
122 DHCPV6_ACCEPT_RECONFIGURE
= 4,
125 typedef int(reply_handler
)(enum dhcpv6_msg orig
, const int rc
,
126 const void *opt
, const void *end
, const struct sockaddr_in6
*from
);
128 // retransmission strategy
135 reply_handler
*handler_reply
;
136 int(*handler_finish
)(void);
139 // DHCPv6 Protocol Headers
140 struct dhcpv6_header
{
143 } __attribute__((packed
));
145 struct dhcpv6_ia_hdr
{
153 struct dhcpv6_ia_addr
{
156 struct in6_addr addr
;
161 struct dhcpv6_ia_prefix
{
167 struct in6_addr addr
;
177 struct dhcpv6_auth_reconfigure
{
188 struct dhcpv6_cer_id
{
191 struct in6_addr addr
;
194 struct dhcpv6_s46_portparams
{
200 struct dhcpv6_s46_v4v6bind
{
201 struct in_addr ipv4_address
;
202 uint8_t bindprefix6_len
;
203 uint8_t bind_ipv6_prefix
[];
206 struct dhcpv6_s46_dmr
{
207 uint8_t dmr_prefix6_len
;
208 uint8_t dmr_ipv6_prefix
[];
211 struct dhcpv6_s46_rule
{
215 struct in_addr ipv4_prefix
;
217 uint8_t ipv6_prefix
[];
220 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
221 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
222 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
223 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
224 _o += 4 + (_o[2] << 8 | _o[3]))
227 struct dhcpv6_server_cand
{
228 bool has_noaddravail
;
229 bool wants_reconfigure
;
287 enum odhcp6c_ia_mode
{
294 struct odhcp6c_entry
{
295 struct in6_addr router
;
298 struct in6_addr target
;
307 struct odhcp6c_request_prefix
{
312 int init_dhcpv6(const char *ifname
, unsigned int client_options
, int sol_timeout
);
313 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
);
314 int dhcpv6_request(enum dhcpv6_msg type
);
315 int dhcpv6_poll_reconfigure(void);
316 int dhcpv6_promote_server_cand(void);
318 int init_rtnetlink(void);
319 int set_rtnetlink_addr(int ifindex
, const struct in6_addr
*addr
,
320 uint32_t pref
, uint32_t valid
);
322 int script_init(const char *path
, const char *ifname
);
323 ssize_t
script_unhexlify(uint8_t *dst
, size_t len
, const char *src
);
324 void script_call(const char *status
);
326 bool odhcp6c_signal_process(void);
327 uint64_t odhcp6c_get_milli_time(void);
328 void odhcp6c_random(void *buf
, size_t len
);
329 bool odhcp6c_is_bound(void);
331 // State manipulation
332 void odhcp6c_clear_state(enum odhcp6c_state state
);
333 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
);
334 void odhcp6c_append_state(enum odhcp6c_state state
, const void *data
, size_t len
);
335 void odhcp6c_insert_state(enum odhcp6c_state state
, size_t offset
, const void *data
, size_t len
);
336 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
);
337 void* odhcp6c_move_state(enum odhcp6c_state state
, size_t *len
);
338 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
);
340 // Entry manipulation
341 struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new);
342 bool odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new, uint32_t safe
, bool filterexcess
);
344 void odhcp6c_expire(void);
345 uint32_t odhcp6c_elapsed(void);