Merge branch 'hnet'
[project/odhcp6c.git] / src / odhcp6c.h
1 /**
2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
3 *
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.
7 *
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.
12 *
13 */
14 #pragma once
15 #include <stdint.h>
16 #include <stdbool.h>
17 #include <netinet/in.h>
18
19 #define _unused __attribute__((unused))
20 #define _packed __attribute__((packed))
21
22 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
23
24 #ifndef SOL_NETLINK
25 #define SOL_NETLINK 270
26 #endif
27
28 #define ND_OPT_RECURSIVE_DNS 25
29 #define ND_OPT_DNSSL 31
30
31 enum dhcvp6_opt {
32 DHCPV6_OPT_CLIENTID = 1,
33 DHCPV6_OPT_SERVERID = 2,
34 DHCPV6_OPT_IA_NA = 3,
35 DHCPV6_OPT_IA_ADDR = 5,
36 DHCPV6_OPT_ORO = 6,
37 DHCPV6_OPT_PREF = 7,
38 DHCPV6_OPT_ELAPSED = 8,
39 DHCPV6_OPT_RELAY_MSG = 9,
40 DHCPV6_OPT_AUTH = 11,
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,
50 DHCPV6_OPT_FQDN = 39,
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 /* draft-bhandari-dhc-class-based-prefix */
57 DHCPV6_OPT_PREFIX_CLASS = 200, /* NOT STANDARDIZED! */
58 };
59
60 enum dhcpv6_opt_npt {
61 NTP_SRV_ADDR = 1,
62 NTP_MC_ADDR = 2,
63 NTP_SRV_FQDN = 3
64 };
65
66 enum dhcpv6_msg {
67 DHCPV6_MSG_UNKNOWN = 0,
68 DHCPV6_MSG_SOLICIT = 1,
69 DHCPV6_MSG_ADVERT = 2,
70 DHCPV6_MSG_REQUEST = 3,
71 DHCPV6_MSG_RENEW = 5,
72 DHCPV6_MSG_REBIND = 6,
73 DHCPV6_MSG_REPLY = 7,
74 DHCPV6_MSG_RELEASE = 8,
75 DHCPV6_MSG_DECLINE = 9,
76 DHCPV6_MSG_RECONF = 10,
77 DHCPV6_MSG_INFO_REQ = 11,
78 _DHCPV6_MSG_MAX
79 };
80
81 enum dhcpv6_status {
82 DHCPV6_NoAddrsAvail = 2,
83 DHCPV6_NoPrefixAvail = 6,
84 };
85
86 typedef int(reply_handler)(enum dhcpv6_msg orig,
87 const void *opt, const void *end);
88
89 // retransmission strategy
90 struct dhcpv6_retx {
91 bool delay;
92 uint8_t init_timeo;
93 uint16_t max_timeo;
94 char name[8];
95 reply_handler *handler_reply;
96 int(*handler_finish)(void);
97 };
98
99
100 // DHCPv6 Protocol Headers
101 struct dhcpv6_header {
102 uint8_t msg_type;
103 uint8_t tr_id[3];
104 } __attribute__((packed));
105
106 struct dhcpv6_ia_hdr {
107 uint16_t type;
108 uint16_t len;
109 uint32_t iaid;
110 uint32_t t1;
111 uint32_t t2;
112 } _packed;
113
114 struct dhcpv6_ia_addr {
115 uint16_t type;
116 uint16_t len;
117 struct in6_addr addr;
118 uint32_t preferred;
119 uint32_t valid;
120 } _packed;
121
122 struct dhcpv6_ia_prefix {
123 uint16_t type;
124 uint16_t len;
125 uint32_t preferred;
126 uint32_t valid;
127 uint8_t prefix;
128 struct in6_addr addr;
129 } _packed;
130
131 struct dhcpv6_duid {
132 uint16_t type;
133 uint16_t len;
134 uint16_t duid_type;
135 uint8_t data[128];
136 } _packed;
137
138 struct dhcpv6_auth_reconfigure {
139 uint16_t type;
140 uint16_t len;
141 uint8_t protocol;
142 uint8_t algorithm;
143 uint8_t rdm;
144 uint64_t replay;
145 uint8_t reconf_type;
146 uint8_t key[16];
147 } _packed;
148
149
150 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
151 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
152 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
153 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
154 _o += 4 + (_o[2] << 8 | _o[3]))
155
156
157 struct dhcpv6_server_cand {
158 bool has_noaddravail;
159 bool wants_reconfigure;
160 int16_t preference;
161 uint8_t duid_len;
162 uint8_t duid[130];
163 void *ia_na;
164 void *ia_pd;
165 size_t ia_na_len;
166 size_t ia_pd_len;
167 };
168
169
170 enum odhcp6c_state {
171 STATE_CLIENT_ID,
172 STATE_SERVER_ID,
173 STATE_SERVER_CAND,
174 STATE_ORO,
175 STATE_DNS,
176 STATE_SEARCH,
177 STATE_IA_NA,
178 STATE_IA_PD,
179 STATE_CUSTOM_OPTS,
180 STATE_SNTP_IP,
181 STATE_SNTP_FQDN,
182 STATE_SIP_IP,
183 STATE_SIP_FQDN,
184 STATE_RA_ROUTE,
185 STATE_RA_PREFIX,
186 STATE_RA_DNS,
187 STATE_AFTR_NAME,
188 _STATE_MAX
189 };
190
191
192 struct icmp6_opt {
193 uint8_t type;
194 uint8_t len;
195 uint8_t data[6];
196 };
197
198
199 enum dhcpv6_mode {
200 DHCPV6_UNKNOWN,
201 DHCPV6_STATELESS,
202 DHCPV6_STATEFUL
203 };
204
205
206 enum odhcp6c_ia_mode {
207 IA_MODE_NONE,
208 IA_MODE_TRY,
209 IA_MODE_FORCE,
210 };
211
212
213 struct odhcp6c_entry {
214 struct in6_addr router;
215 uint16_t length;
216 int16_t priority;
217 struct in6_addr target;
218 uint32_t valid;
219 uint32_t preferred;
220 uint32_t prefix_class;
221 };
222
223
224 int init_dhcpv6(const char *ifname, int request_pd);
225 void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode);
226 int dhcpv6_request(enum dhcpv6_msg type);
227 int dhcpv6_poll_reconfigure(void);
228
229 int init_rtnetlink(void);
230 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
231 uint32_t pref, uint32_t valid);
232
233 int script_init(const char *path, const char *ifname);
234 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
235 void script_call(const char *status);
236 void script_delay_call(const char *status, int timeout);
237
238 bool odhcp6c_signal_process(void);
239 uint64_t odhcp6c_get_milli_time(void);
240 void odhcp6c_random(void *buf, size_t len);
241
242 // State manipulation
243 void odhcp6c_clear_state(enum odhcp6c_state state);
244 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
245 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
246 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
247 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
248
249 // Entry manipulation
250 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new);
251 void odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new);
252 void odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe);
253
254 void odhcp6c_expire(void);
255 uint32_t odhcp6c_elapsed(void);