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,
77 /* draft-ietf-softwire-map-dhcp-07 */
78 DHCPV6_OPT_S46_RULE = EXT_S46,
79 DHCPV6_OPT_S46_BR = EXT_S46 + 1,
80 DHCPV6_OPT_S46_DMR = EXT_S46 + 2,
81 DHCPV6_OPT_S46_V4V6BIND = EXT_S46 + 3,
82 DHCPV6_OPT_S46_PORTPARAMS = EXT_S46 + 4,
83 DHCPV6_OPT_S46_CONT_MAPE = EXT_S46 + 5,
84 DHCPV6_OPT_S46_CONT_MAPT = EXT_S46 + 6,
85 DHCPV6_OPT_S46_CONT_LW = EXT_S46 + 7,
96 DHCPV6_MSG_UNKNOWN = 0,
97 DHCPV6_MSG_SOLICIT = 1,
98 DHCPV6_MSG_ADVERT = 2,
99 DHCPV6_MSG_REQUEST = 3,
100 DHCPV6_MSG_RENEW = 5,
101 DHCPV6_MSG_REBIND = 6,
102 DHCPV6_MSG_REPLY = 7,
103 DHCPV6_MSG_RELEASE = 8,
104 DHCPV6_MSG_DECLINE = 9,
105 DHCPV6_MSG_RECONF = 10,
106 DHCPV6_MSG_INFO_REQ = 11,
112 DHCPV6_UnspecFail = 1,
113 DHCPV6_NoAddrsAvail = 2,
114 DHCPV6_NoBinding = 3,
115 DHCPV6_NotOnLink = 4,
116 DHCPV6_UseMulticast = 5,
117 DHCPV6_NoPrefixAvail = 6,
122 DHCPV6_STRICT_OPTIONS = 1,
123 DHCPV6_CLIENT_FQDN = 2,
124 DHCPV6_ACCEPT_RECONFIGURE = 4,
127 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
128 const void *opt, const void *end);
130 // retransmission strategy
137 reply_handler *handler_reply;
138 int(*handler_finish)(void);
141 // DHCPv6 Protocol Headers
142 struct dhcpv6_header {
145 } __attribute__((packed));
147 struct dhcpv6_ia_hdr {
155 struct dhcpv6_ia_addr {
158 struct in6_addr addr;
163 struct dhcpv6_ia_prefix {
169 struct in6_addr addr;
179 struct dhcpv6_auth_reconfigure {
190 struct dhcpv6_cer_id {
196 struct in6_addr addr;
199 struct dhcpv6_s46_portparams {
205 struct dhcpv6_s46_v4v6bind {
206 struct in_addr ipv4_address;
207 uint8_t bindprefix6_len;
208 uint8_t bind_ipv6_prefix[];
211 struct dhcpv6_s46_dmr {
212 uint8_t dmr_prefix6_len;
213 uint8_t dmr_ipv6_prefix[];
216 struct dhcpv6_s46_rule {
220 struct in_addr ipv4_prefix;
222 uint8_t ipv6_prefix[];
225 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
226 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
227 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
228 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
229 _o += 4 + (_o[2] << 8 | _o[3]))
232 struct dhcpv6_server_cand {
233 bool has_noaddravail;
234 bool wants_reconfigure;
291 enum odhcp6c_ia_mode {
298 struct odhcp6c_entry {
299 struct in6_addr router;
302 struct in6_addr target;
311 struct odhcp6c_request_prefix {
316 int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout);
317 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
318 int dhcpv6_request(enum dhcpv6_msg type);
319 int dhcpv6_poll_reconfigure(void);
320 int dhcpv6_promote_server_cand(void);
322 int init_rtnetlink(void);
323 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
324 uint32_t pref, uint32_t valid);
326 int script_init(const char *path, const char *ifname);
327 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
328 void script_call(const char *status);
329 void script_delay_call(const char *status, int timeout);
331 bool odhcp6c_signal_process(void);
332 uint64_t odhcp6c_get_milli_time(void);
333 void odhcp6c_random(void *buf, size_t len);
334 bool odhcp6c_is_bound(void);
336 // State manipulation
337 void odhcp6c_clear_state(enum odhcp6c_state state);
338 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
339 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len);
340 void odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
341 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
342 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
343 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
345 // Entry manipulation
346 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new);
347 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new);
348 bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe);
350 void odhcp6c_expire(void);
351 uint32_t odhcp6c_elapsed(void);