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,
40 DHCPV6_OPT_IA_ADDR = 5,
43 DHCPV6_OPT_ELAPSED = 8,
44 DHCPV6_OPT_RELAY_MSG = 9,
46 DHCPV6_OPT_STATUS = 13,
47 DHCPV6_OPT_RAPID_COMMIT = 14,
48 DHCPV6_OPT_USER_CLASS = 15,
49 DHCPV6_OPT_VENDOR_CLASS = 16,
50 DHCPV6_OPT_RECONF_MESSAGE = 19,
51 DHCPV6_OPT_RECONF_ACCEPT = 20,
52 DHCPV6_OPT_DNS_SERVERS = 23,
53 DHCPV6_OPT_DNS_DOMAIN = 24,
54 DHCPV6_OPT_IA_PD = 25,
55 DHCPV6_OPT_IA_PREFIX = 26,
56 DHCPV6_OPT_SNTP_SERVERS = 31,
57 DHCPV6_OPT_INFO_REFRESH = 32,
59 DHCPV6_OPT_NTP_SERVER = 56,
60 DHCPV6_OPT_SIP_SERVER_D = 21,
61 DHCPV6_OPT_SIP_SERVER_A = 22,
62 DHCPV6_OPT_AFTR_NAME = 64,
63 DHCPV6_OPT_PD_EXCLUDE = 67,
64 DHCPV6_OPT_SOL_MAX_RT = 82,
65 DHCPV6_OPT_INF_MAX_RT = 83,
66 #ifdef EXT_PREFIX_CLASS
67 /* draft-bhandari-dhc-class-based-prefix, not yet standardized */
68 DHCPV6_OPT_PREFIX_CLASS = EXT_PREFIX_CLASS,
71 /* draft-donley-dhc-cer-id-option-03 */
72 DHCPV6_OPT_CER_ID = EXT_CER_ID,
83 DHCPV6_MSG_UNKNOWN = 0,
84 DHCPV6_MSG_SOLICIT = 1,
85 DHCPV6_MSG_ADVERT = 2,
86 DHCPV6_MSG_REQUEST = 3,
88 DHCPV6_MSG_REBIND = 6,
90 DHCPV6_MSG_RELEASE = 8,
91 DHCPV6_MSG_DECLINE = 9,
92 DHCPV6_MSG_RECONF = 10,
93 DHCPV6_MSG_INFO_REQ = 11,
99 DHCPV6_UnspecFail = 1,
100 DHCPV6_NoAddrsAvail = 2,
101 DHCPV6_NoBinding = 3,
102 DHCPV6_NotOnLink = 4,
103 DHCPV6_UseMulticast = 5,
104 DHCPV6_NoPrefixAvail = 6,
109 DHCPV6_STRICT_OPTIONS = 1,
110 DHCPV6_CLIENT_FQDN = 2,
111 DHCPV6_ACCEPT_RECONFIGURE = 4,
114 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
115 const void *opt, const void *end);
117 // retransmission strategy
124 reply_handler *handler_reply;
125 int(*handler_finish)(void);
128 // DHCPv6 Protocol Headers
129 struct dhcpv6_header {
132 } __attribute__((packed));
134 struct dhcpv6_ia_hdr {
142 struct dhcpv6_ia_addr {
145 struct in6_addr addr;
150 struct dhcpv6_ia_prefix {
156 struct in6_addr addr;
166 struct dhcpv6_auth_reconfigure {
177 struct dhcpv6_cer_id {
183 struct in6_addr addr;
187 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
188 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
189 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
190 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
191 _o += 4 + (_o[2] << 8 | _o[3]))
194 struct dhcpv6_server_cand {
195 bool has_noaddravail;
196 bool wants_reconfigure;
249 enum odhcp6c_ia_mode {
256 struct odhcp6c_entry {
257 struct in6_addr router;
260 struct in6_addr target;
269 struct odhcp6c_request_prefix {
274 int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout);
275 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
276 int dhcpv6_request(enum dhcpv6_msg type);
277 int dhcpv6_poll_reconfigure(void);
278 int dhcpv6_promote_server_cand(void);
280 int init_rtnetlink(void);
281 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
282 uint32_t pref, uint32_t valid);
284 int script_init(const char *path, const char *ifname);
285 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
286 void script_call(const char *status);
287 void script_delay_call(const char *status, int timeout);
289 bool odhcp6c_signal_process(void);
290 uint64_t odhcp6c_get_milli_time(void);
291 void odhcp6c_random(void *buf, size_t len);
292 bool odhcp6c_is_bound(void);
294 // State manipulation
295 void odhcp6c_clear_state(enum odhcp6c_state state);
296 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
297 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len);
298 void odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
299 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
300 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
301 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
303 // Entry manipulation
304 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new);
305 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new);
306 bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe);
308 void odhcp6c_expire(void);
309 uint32_t odhcp6c_elapsed(void);