2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2018 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
18 #include <netinet/in.h>
20 #define _unused __attribute__((unused))
21 #define _packed __attribute__((packed))
22 #define _aligned(n) __attribute__((aligned(n)))
24 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
26 #define ND_OPT_RECURSIVE_DNS 25
27 #define ND_OPT_DNSSL 31
29 #define DHCPV6_SOL_MAX_RT 120
30 #define DHCPV6_REQ_MAX_RT 30
31 #define DHCPV6_CNF_MAX_RT 4
32 #define DHCPV6_REN_MAX_RT 600
33 #define DHCPV6_REB_MAX_RT 600
34 #define DHCPV6_INF_MAX_RT 120
36 #define RA_MIN_ADV_INTERVAL 3 /* RFC 4861 paragraph 6.2.1 */
39 DHCPV6_OPT_CLIENTID
= 1,
40 DHCPV6_OPT_SERVERID
= 2,
43 DHCPV6_OPT_IA_ADDR
= 5,
46 DHCPV6_OPT_ELAPSED
= 8,
47 DHCPV6_OPT_RELAY_MSG
= 9,
49 DHCPV6_OPT_UNICAST
= 12,
50 DHCPV6_OPT_STATUS
= 13,
51 DHCPV6_OPT_RAPID_COMMIT
= 14,
52 DHCPV6_OPT_USER_CLASS
= 15,
53 DHCPV6_OPT_VENDOR_CLASS
= 16,
54 DHCPV6_OPT_RECONF_MESSAGE
= 19,
55 DHCPV6_OPT_RECONF_ACCEPT
= 20,
56 DHCPV6_OPT_DNS_SERVERS
= 23,
57 DHCPV6_OPT_DNS_DOMAIN
= 24,
58 DHCPV6_OPT_IA_PD
= 25,
59 DHCPV6_OPT_IA_PREFIX
= 26,
60 DHCPV6_OPT_SNTP_SERVERS
= 31,
61 DHCPV6_OPT_INFO_REFRESH
= 32,
63 DHCPV6_OPT_NTP_SERVER
= 56,
64 DHCPV6_OPT_SIP_SERVER_D
= 21,
65 DHCPV6_OPT_SIP_SERVER_A
= 22,
66 DHCPV6_OPT_AFTR_NAME
= 64,
67 DHCPV6_OPT_PD_EXCLUDE
= 67,
68 DHCPV6_OPT_SOL_MAX_RT
= 82,
69 DHCPV6_OPT_INF_MAX_RT
= 83,
71 /* draft-donley-dhc-cer-id-option-03 */
72 DHCPV6_OPT_CER_ID
= EXT_CER_ID
,
74 /* draft-ietf-softwire-map-dhcp-08 */
75 DHCPV6_OPT_S46_RULE
= 89,
76 DHCPV6_OPT_S46_BR
= 90,
77 DHCPV6_OPT_S46_DMR
= 91,
78 DHCPV6_OPT_S46_V4V6BIND
= 92,
79 DHCPV6_OPT_S46_PORTPARAMS
= 93,
80 DHCPV6_OPT_S46_CONT_MAPE
= 94,
81 DHCPV6_OPT_S46_CONT_MAPT
= 95,
82 DHCPV6_OPT_S46_CONT_LW
= 96,
92 DHCPV6_MSG_UNKNOWN
= 0,
93 DHCPV6_MSG_SOLICIT
= 1,
94 DHCPV6_MSG_ADVERT
= 2,
95 DHCPV6_MSG_REQUEST
= 3,
97 DHCPV6_MSG_REBIND
= 6,
99 DHCPV6_MSG_RELEASE
= 8,
100 DHCPV6_MSG_DECLINE
= 9,
101 DHCPV6_MSG_RECONF
= 10,
102 DHCPV6_MSG_INFO_REQ
= 11,
108 DHCPV6_UnspecFail
= 1,
109 DHCPV6_NoAddrsAvail
= 2,
110 DHCPV6_NoBinding
= 3,
111 DHCPV6_NotOnLink
= 4,
112 DHCPV6_UseMulticast
= 5,
113 DHCPV6_NoPrefixAvail
= 6,
118 DHCPV6_STRICT_OPTIONS
= 1,
119 DHCPV6_CLIENT_FQDN
= 2,
120 DHCPV6_ACCEPT_RECONFIGURE
= 4,
123 typedef int(reply_handler
)(enum dhcpv6_msg orig
, const int rc
,
124 const void *opt
, const void *end
, const struct sockaddr_in6
*from
);
126 // retransmission strategy
133 reply_handler
*handler_reply
;
134 int(*handler_finish
)(void);
137 // DHCPv6 Protocol Headers
138 struct dhcpv6_header
{
141 } __attribute__((packed
));
143 struct dhcpv6_ia_hdr
{
151 struct dhcpv6_ia_addr
{
154 struct in6_addr addr
;
159 struct dhcpv6_ia_prefix
{
165 struct in6_addr addr
;
175 struct dhcpv6_auth_reconfigure
{
186 struct dhcpv6_cer_id
{
189 struct in6_addr addr
;
192 struct dhcpv6_s46_portparams
{
198 struct dhcpv6_s46_v4v6bind
{
199 struct in_addr ipv4_address
;
200 uint8_t bindprefix6_len
;
201 uint8_t bind_ipv6_prefix
[];
204 struct dhcpv6_s46_dmr
{
205 uint8_t dmr_prefix6_len
;
206 uint8_t dmr_ipv6_prefix
[];
209 struct dhcpv6_s46_rule
{
213 struct in_addr ipv4_prefix
;
215 uint8_t ipv6_prefix
[];
218 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
219 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
220 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
221 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
222 _o += 4 + (_o[2] << 8 | _o[3]))
225 struct dhcpv6_server_cand
{
226 bool has_noaddravail
;
227 bool wants_reconfigure
;
231 struct in6_addr server_addr
;
288 RA_RDNSS_DEFAULT_LIFETIME
= 1,
291 enum odhcp6c_ia_mode
{
298 struct odhcp6c_entry
{
299 struct in6_addr router
;
303 struct in6_addr target
;
312 // Include padding after auxtarget to align the next entry
313 #define odhcp6c_entry_size(entry) \
314 (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3))
316 #define odhcp6c_next_entry(entry) \
317 ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry)))
320 struct odhcp6c_request_prefix
{
325 int init_dhcpv6(const char *ifname
, unsigned int client_options
, int sol_timeout
);
326 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
);
327 int dhcpv6_request(enum dhcpv6_msg type
);
328 int dhcpv6_poll_reconfigure(void);
329 int dhcpv6_promote_server_cand(void);
331 int init_rtnetlink(void);
332 int set_rtnetlink_addr(int ifindex
, const struct in6_addr
*addr
,
333 uint32_t pref
, uint32_t valid
);
335 int ra_conf_hoplimit(int newvalue
);
336 int ra_conf_mtu(int newvalue
);
337 int ra_conf_reachable(int newvalue
);
338 int ra_conf_retransmit(int newvalue
);
340 int script_init(const char *path
, const char *ifname
);
341 ssize_t
script_unhexlify(uint8_t *dst
, size_t len
, const char *src
);
342 void script_call(const char *status
, int delay
, bool resume
);
344 bool odhcp6c_signal_process(void);
345 uint64_t odhcp6c_get_milli_time(void);
346 int odhcp6c_random(void *buf
, size_t len
);
347 bool odhcp6c_is_bound(void);
348 bool odhcp6c_addr_in_scope(const struct in6_addr
*addr
);
350 // State manipulation
351 void odhcp6c_clear_state(enum odhcp6c_state state
);
352 int odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
);
353 void odhcp6c_append_state(enum odhcp6c_state state
, const void *data
, size_t len
);
354 int odhcp6c_insert_state(enum odhcp6c_state state
, size_t offset
, const void *data
, size_t len
);
355 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
);
356 void* odhcp6c_move_state(enum odhcp6c_state state
, size_t *len
);
357 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
);
359 // Entry manipulation
360 bool odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new,
361 uint32_t safe
, unsigned int holdoff_interval
);
363 void odhcp6c_expire(void);
364 uint32_t odhcp6c_elapsed(void);