1/**
2 * Copyright (C) 2012-2014 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#include "stubs.h"
20
21#define _unused __attribute__((unused))
22#define _packed __attribute__((packed))
23
24#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
25
26#define ND_OPT_RECURSIVE_DNS 25
27#define ND_OPT_DNSSL 31
28
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
35
36#define DEFAULT_MIN_UPDATE_INTERVAL 30
37
38enum dhcvp6_opt {
39	DHCPV6_OPT_CLIENTID = 1,
40	DHCPV6_OPT_SERVERID = 2,
41	DHCPV6_OPT_IA_NA = 3,
42	DHCPV6_OPT_IA_TA = 4,
43	DHCPV6_OPT_IA_ADDR = 5,
44	DHCPV6_OPT_ORO = 6,
45	DHCPV6_OPT_PREF = 7,
46	DHCPV6_OPT_ELAPSED = 8,
47	DHCPV6_OPT_RELAY_MSG = 9,
48	DHCPV6_OPT_AUTH = 11,
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,
62	DHCPV6_OPT_FQDN = 39,
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,
70#ifdef EXT_CER_ID
71	/* draft-donley-dhc-cer-id-option-03 */
72	DHCPV6_OPT_CER_ID = EXT_CER_ID,
73#endif
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,
83};
84
85enum dhcpv6_opt_npt {
86	NTP_SRV_ADDR = 1,
87	NTP_MC_ADDR = 2,
88	NTP_SRV_FQDN = 3
89};
90
91enum dhcpv6_msg {
92	DHCPV6_MSG_UNKNOWN = 0,
93	DHCPV6_MSG_SOLICIT = 1,
94	DHCPV6_MSG_ADVERT = 2,
95	DHCPV6_MSG_REQUEST = 3,
96	DHCPV6_MSG_RENEW = 5,
97	DHCPV6_MSG_REBIND = 6,
98	DHCPV6_MSG_REPLY = 7,
99	DHCPV6_MSG_RELEASE = 8,
100	DHCPV6_MSG_DECLINE = 9,
101	DHCPV6_MSG_RECONF = 10,
102	DHCPV6_MSG_INFO_REQ = 11,
103	_DHCPV6_MSG_MAX
104};
105
106enum dhcpv6_status {
107	DHCPV6_Success = 0,
108	DHCPV6_UnspecFail = 1,
109	DHCPV6_NoAddrsAvail = 2,
110	DHCPV6_NoBinding = 3,
111	DHCPV6_NotOnLink = 4,
112	DHCPV6_UseMulticast = 5,
113	DHCPV6_NoPrefixAvail = 6,
114	_DHCPV6_Status_Max
115};
116
117enum dhcpv6_config {
118	DHCPV6_STRICT_OPTIONS = 1,
119	DHCPV6_CLIENT_FQDN = 2,
120	DHCPV6_ACCEPT_RECONFIGURE = 4,
121};
122
123typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
124		const void *opt, const void *end, const struct sockaddr_in6 *from);
125
126// retransmission strategy
127struct dhcpv6_retx {
128	bool delay;
129	uint8_t init_timeo;
130	uint16_t max_timeo;
131	uint8_t max_rc;
132	char name[8];
133	reply_handler *handler_reply;
134	int(*handler_finish)(void);
135};
136
137// DHCPv6 Protocol Headers
138struct dhcpv6_header {
139	uint8_t msg_type;
140	uint8_t tr_id[3];
141} __attribute__((packed));
142
143struct dhcpv6_ia_hdr {
144	uint16_t type;
145	uint16_t len;
146	uint32_t iaid;
147	uint32_t t1;
148	uint32_t t2;
149} _packed;
150
151struct dhcpv6_ia_addr {
152	uint16_t type;
153	uint16_t len;
154	struct in6_addr addr;
155	uint32_t preferred;
156	uint32_t valid;
157} _packed;
158
159struct dhcpv6_ia_prefix {
160	uint16_t type;
161	uint16_t len;
162	uint32_t preferred;
163	uint32_t valid;
164	uint8_t prefix;
165	struct in6_addr addr;
166} _packed;
167
168struct dhcpv6_duid {
169	uint16_t type;
170	uint16_t len;
171	uint16_t duid_type;
172	uint8_t data[128];
173} _packed;
174
175struct dhcpv6_auth_reconfigure {
176	uint16_t type;
177	uint16_t len;
178	uint8_t protocol;
179	uint8_t algorithm;
180	uint8_t rdm;
181	uint64_t replay;
182	uint8_t reconf_type;
183	uint8_t key[16];
184} _packed;
185
186struct dhcpv6_cer_id {
187	uint16_t type;
188	uint16_t len;
189	struct in6_addr addr;
190} _packed;
191
192struct dhcpv6_s46_portparams {
193	uint8_t offset;
194	uint8_t psid_len;
195	uint16_t psid;
196} _packed;
197
198struct dhcpv6_s46_v4v6bind {
199	struct in_addr ipv4_address;
200	uint8_t bindprefix6_len;
201	uint8_t bind_ipv6_prefix[];
202} _packed;
203
204struct dhcpv6_s46_dmr {
205	uint8_t dmr_prefix6_len;
206	uint8_t dmr_ipv6_prefix[];
207} _packed;
208
209struct dhcpv6_s46_rule {
210	uint8_t flags;
211	uint8_t ea_len;
212	uint8_t prefix4_len;
213	struct in_addr ipv4_prefix;
214	uint8_t prefix6_len;
215	uint8_t ipv6_prefix[];
216} _packed;
217
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]))
223
224
225struct dhcpv6_server_cand {
226	bool has_noaddravail;
227	bool wants_reconfigure;
228	int16_t preference;
229	uint8_t duid_len;
230	uint8_t duid[130];
231	uint32_t sol_max_rt;
232	uint32_t inf_max_rt;
233	void *ia_na;
234	void *ia_pd;
235	size_t ia_na_len;
236	size_t ia_pd_len;
237};
238
239
240enum odhcp6c_state {
241	STATE_CLIENT_ID,
242	STATE_SERVER_ID,
243	STATE_SERVER_CAND,
244	STATE_SERVER_ADDR,
245	STATE_ORO,
246	STATE_DNS,
247	STATE_SEARCH,
248	STATE_IA_NA,
249	STATE_IA_PD,
250	STATE_IA_PD_INIT,
251	STATE_CUSTOM_OPTS,
252	STATE_SNTP_IP,
253	STATE_NTP_IP,
254	STATE_NTP_FQDN,
255	STATE_SIP_IP,
256	STATE_SIP_FQDN,
257	STATE_RA_ROUTE,
258	STATE_RA_PREFIX,
259	STATE_RA_DNS,
260	STATE_RA_SEARCH,
261	STATE_AFTR_NAME,
262	STATE_VENDORCLASS,
263	STATE_USERCLASS,
264	STATE_CER,
265	STATE_S46_MAPT,
266	STATE_S46_MAPE,
267	STATE_S46_LW,
268	STATE_PASSTHRU,
269	_STATE_MAX
270};
271
272
273struct icmp6_opt {
274	uint8_t type;
275	uint8_t len;
276	uint8_t data[6];
277};
278
279
280enum dhcpv6_mode {
281	DHCPV6_UNKNOWN = -1,
282	DHCPV6_STATELESS,
283	DHCPV6_STATEFUL
284};
285
286enum odhcp6c_ia_mode {
287	IA_MODE_NONE,
288	IA_MODE_TRY,
289	IA_MODE_FORCE,
290};
291
292
293struct odhcp6c_entry {
294	struct in6_addr router;
295	uint8_t auxlen;
296	uint8_t length;
297	int16_t priority;
298	struct in6_addr target;
299	uint32_t valid;
300	uint32_t preferred;
301	uint32_t t1;
302	uint32_t t2;
303	uint32_t iaid;
304	uint8_t auxtarget[];
305};
306
307struct odhcp6c_request_prefix {
308	uint32_t iaid;
309	uint16_t length;
310};
311
312int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout);
313int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
314int dhcpv6_request(enum dhcpv6_msg type);
315int dhcpv6_poll_reconfigure(void);
316int dhcpv6_promote_server_cand(void);
317
318int init_rtnetlink(void);
319int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
320		uint32_t pref, uint32_t valid);
321
322int ra_conf_hoplimit(int newvalue);
323int ra_conf_mtu(int newvalue);
324int ra_conf_reachable(int newvalue);
325int ra_conf_retransmit(int newvalue);
326
327int script_init(const char *path, const char *ifname);
328ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
329void script_call(const char *status, int delay, bool resume);
330
331bool odhcp6c_signal_process(void);
332uint64_t odhcp6c_get_milli_time(void);
333int odhcp6c_random(void *buf, size_t len);
334bool odhcp6c_is_bound(void);
335
336// State manipulation
337void odhcp6c_clear_state(enum odhcp6c_state state);
338void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
339void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len);
340int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
341size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
342void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
343void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
344
345// Entry manipulation
346bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe, bool filterexcess);
347
348void odhcp6c_expire(void);
349uint32_t odhcp6c_elapsed(void);
350