2 * Copyright (C) 2012-2013 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]))
25 #define SOL_NETLINK 270
28 #define ND_OPT_RECURSIVE_DNS 25
29 #define ND_OPT_DNSSL 31
32 DHCPV6_OPT_CLIENTID
= 1,
33 DHCPV6_OPT_SERVERID
= 2,
35 DHCPV6_OPT_IA_ADDR
= 5,
38 DHCPV6_OPT_ELAPSED
= 8,
39 DHCPV6_OPT_RELAY_MSG
= 9,
41 DHCPV6_OPT_STATUS
= 13,
42 DHCPV6_OPT_RAPID_COMMIT
= 14,
43 DHCPV6_OPT_RECONF_MESSAGE
= 19,
44 DHCPV6_OPT_RECONF_ACCEPT
= 20,
45 DHCPV6_OPT_DNS_SERVERS
= 23,
46 DHCPV6_OPT_DNS_DOMAIN
= 24,
47 DHCPV6_OPT_IA_PD
= 25,
48 DHCPV6_OPT_IA_PREFIX
= 26,
49 DHCPV6_OPT_INFO_REFRESH
= 32,
51 DHCPV6_OPT_NTP_SERVER
= 56,
52 DHCPV6_OPT_SIP_SERVER_D
= 21,
53 DHCPV6_OPT_SIP_SERVER_A
= 22,
54 DHCPV6_OPT_AFTR_NAME
= 64,
55 DHCPV6_OPT_PD_EXCLUDE
= 67,
56 #ifdef EXT_PREFIX_CLASS
57 /* draft-bhandari-dhc-class-based-prefix, not yet standardized */
58 DHCPV6_OPT_PREFIX_CLASS
= EXT_PREFIX_CLASS
,
69 DHCPV6_MSG_UNKNOWN
= 0,
70 DHCPV6_MSG_SOLICIT
= 1,
71 DHCPV6_MSG_ADVERT
= 2,
72 DHCPV6_MSG_REQUEST
= 3,
74 DHCPV6_MSG_REBIND
= 6,
76 DHCPV6_MSG_RELEASE
= 8,
77 DHCPV6_MSG_DECLINE
= 9,
78 DHCPV6_MSG_RECONF
= 10,
79 DHCPV6_MSG_INFO_REQ
= 11,
84 DHCPV6_NoAddrsAvail
= 2,
85 DHCPV6_NoPrefixAvail
= 6,
88 typedef int(reply_handler
)(enum dhcpv6_msg orig
,
89 const void *opt
, const void *end
);
91 // retransmission strategy
97 reply_handler
*handler_reply
;
98 int(*handler_finish
)(void);
102 // DHCPv6 Protocol Headers
103 struct dhcpv6_header
{
106 } __attribute__((packed
));
108 struct dhcpv6_ia_hdr
{
116 struct dhcpv6_ia_addr
{
119 struct in6_addr addr
;
124 struct dhcpv6_ia_prefix
{
130 struct in6_addr addr
;
140 struct dhcpv6_auth_reconfigure
{
152 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
153 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
154 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
155 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
156 _o += 4 + (_o[2] << 8 | _o[3]))
159 struct dhcpv6_server_cand
{
160 bool has_noaddravail
;
161 bool wants_reconfigure
;
208 enum odhcp6c_ia_mode
{
215 struct odhcp6c_entry
{
216 struct in6_addr router
;
219 struct in6_addr target
;
226 int init_dhcpv6(const char *ifname
, int request_pd
, int sol_timeout
);
227 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
);
228 int dhcpv6_request(enum dhcpv6_msg type
);
229 int dhcpv6_poll_reconfigure(void);
231 int init_rtnetlink(void);
232 int set_rtnetlink_addr(int ifindex
, const struct in6_addr
*addr
,
233 uint32_t pref
, uint32_t valid
);
235 int script_init(const char *path
, const char *ifname
);
236 ssize_t
script_unhexlify(uint8_t *dst
, size_t len
, const char *src
);
237 void script_call(const char *status
);
238 void script_delay_call(const char *status
, int timeout
);
240 bool odhcp6c_signal_process(void);
241 uint64_t odhcp6c_get_milli_time(void);
242 void odhcp6c_random(void *buf
, size_t len
);
244 // State manipulation
245 void odhcp6c_clear_state(enum odhcp6c_state state
);
246 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
);
247 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
);
248 void* odhcp6c_move_state(enum odhcp6c_state state
, size_t *len
);
249 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
);
251 // Entry manipulation
252 struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new);
253 bool odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new);
254 bool odhcp6c_update_entry_safe(enum odhcp6c_state state
, struct odhcp6c_entry
*new, uint32_t safe
);
256 void odhcp6c_expire(void);
257 uint32_t odhcp6c_elapsed(void);