aboutsummaryrefslogtreecommitdiff
path: root/contrib/isc-dhcp/includes/failover.h
blob: 2fd880d1e1d0fbd4d8c062c0b5d173659c2e352d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
/* failover.h

   Definitions for address trees... */

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 2000-2003 by Internet Software Consortium
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 *   Internet Systems Consortium, Inc.
 *   950 Charter Street
 *   Redwood City, CA 94063
 *   <info@isc.org>
 *   http://www.isc.org/
 *
 * This software has been written for Internet Systems Consortium
 * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
 * To learn more about Internet Systems Consortium, see
 * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
 * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
 * ``http://www.nominum.com''.
 */

#if defined (FAILOVER_PROTOCOL)
struct failover_option_info {
	int code;
	const char *name;
	enum { FT_UINT8, FT_IPADDR, FT_UINT32, FT_BYTES, FT_TEXT_OR_BYTES,
	       FT_DDNS, FT_DDNS1, FT_UINT16, FT_TEXT,
	       FT_UNDEF, FT_DIGEST } type;
	int num_present;
	int offset;
	u_int32_t bit;
};

typedef struct {
	unsigned count;
	u_int8_t *data;
} failover_option_t;

#define FM_OFFSET(x) (long)(&(((failover_message_t *)0) -> x))

/* Failover message options: */
#define FTO_BINDING_STATUS		1
#define FTB_BINDING_STATUS			0x00000002
#define FTO_ASSIGNED_IP_ADDRESS		2
#define FTB_ASSIGNED_IP_ADDRESS			0x00000004
#define FTO_SERVER_ADDR			3
#define FTB_SERVER_ADDR				0x00000008
#define FTO_ADDRESSES_TRANSFERRED	4
#define FTB_ADDRESSES_TRANSFERRED		0x00000010
#define FTO_CLIENT_IDENTIFIER		5
#define FTB_CLIENT_IDENTIFIER			0x00000020
#define FTO_CHADDR			6
#define FTB_CHADDR				0x00000040
#define FTO_DDNS			7
#define FTB_DDNS				0x00000080
#define FTO_REJECT_REASON		8
#define FTB_REJECT_REASON			0x00000100
#define FTO_MESSAGE			9
#define FTB_MESSAGE				0x00000200
#define FTO_MCLT			10
#define FTB_MCLT				0x00000400
#define FTO_VENDOR_CLASS		11
#define FTB_VENDOR_CLASS			0x00000800
#define FTO_LEASE_EXPIRY		13
#define FTB_LEASE_EXPIRY			0x00002000
#define FTO_POTENTIAL_EXPIRY		14
#define FTB_POTENTIAL_EXPIRY			0x00004000
#define FTO_GRACE_EXPIRY		15
#define FTB_GRACE_EXPIRY			0x00008000
#define FTO_CLTT			16
#define FTB_CLTT				0x00010000
#define FTO_STOS			17
#define FTB_STOS				0x00020000
#define FTO_SERVER_STATE		18
#define FTB_SERVER_STATE			0x00040000
#define FTO_SERVER_FLAGS		19
#define FTB_SERVER_FLAGS			0x00080000
#define FTO_VENDOR_OPTIONS		20
#define FTB_VENDOR_OPTIONS			0x00100000
#define FTO_MAX_UNACKED			21
#define FTB_MAX_UNACKED				0x00200000
#define FTO_RECEIVE_TIMER		23
#define FTB_RECEIVE_TIMER			0x00800000
#define FTO_HBA				24
#define FTB_HBA					0x01000000
#define FTO_MESSAGE_DIGEST		25
#define FTB_MESSAGE_DIGEST			0x02000000
#define FTO_PROTOCOL_VERSION		26
#define FTB_PROTOCOL_VERSION			0x04000000
#define FTO_TLS_REQUEST			27
#define FTB_TLS_REQUEST				0x08000000
#define FTO_TLS_REPLY			28
#define FTB_TLS_REPLY				0x10000000
#define FTO_REQUEST_OPTIONS		29
#define FTB_REQUEST_OPTIONS			0x20000000
#define FTO_REPLY_OPTIONS		30
#define FTB_REPLY_OPTIONS			0x40000000
#define FTO_MAX				FTO_REPLY_OPTIONS

/* Failover protocol message types: */
#define FTM_POOLREQ		1
#define FTM_POOLRESP		2
#define FTM_BNDUPD		3
#define FTM_BNDACK		4
#define FTM_CONNECT		5
#define FTM_CONNECTACK		6
#define FTM_UPDREQ		7
#define FTM_UPDDONE		8
#define FTM_UPDREQALL		9
#define FTM_STATE		10
#define FTM_CONTACT		11
#define FTM_DISCONNECT		12

/* Reject reasons: */

#define FTR_ILLEGAL_IP_ADDR	1
#define FTR_FATAL_CONFLICT	2
#define FTR_MISSING_BINDINFO	3
#define FTR_TIMEMISMATCH	4
#define FTR_INVALID_MCLT	5
#define FTR_MISC_REJECT		6
#define FTR_DUP_CONNECTION	7
#define FTR_INVALID_PARTNER	8
#define FTR_TLS_UNSUPPORTED	9
#define FTR_TLS_UNCONFIGURED	10
#define FTR_TLS_REQUIRED	11
#define FTR_DIGEST_UNSUPPORTED	12
#define FTR_DIGEST_UNCONFIGURED	13
#define FTR_VERSION_MISMATCH	14
#define FTR_MISSING_BIND_INFO	15
#define FTR_OUTDATED_BIND_INFO	16
#define FTR_LESS_CRIT_BIND_INFO	17
#define FTR_NO_TRAFFIC		18
#define FTR_HBA_CONFLICT	19
#define FTR_UNKNOWN		254

#define DHCP_FAILOVER_MAX_MESSAGE_SIZE	2048

/* Failover server flags. */
#define FTF_STARTUP	1

typedef struct failover_message {
	int refcnt;
	struct failover_message *next;

	u_int8_t type;

	u_int8_t binding_status;
	u_int8_t protocol_version;
	u_int8_t reject_reason;
	u_int8_t server_flags;
	u_int8_t server_state;
	u_int8_t tls_reply;
	u_int8_t tls_request;
	u_int32_t stos;
	u_int32_t time;
	u_int32_t xid;
	u_int32_t addresses_transferred;
	u_int32_t assigned_addr;
	u_int32_t client_ltt;
	u_int32_t expiry;
	u_int32_t grace_expiry;
	u_int32_t max_unacked;
	u_int32_t mclt;
	u_int32_t potential_expiry;
	u_int32_t receive_timer;
	u_int32_t server_addr;
	failover_option_t chaddr;
	failover_option_t client_identifier;
	failover_option_t hba;
	failover_option_t message;
	failover_option_t reply_options;
	failover_option_t request_options;
	ddns_fqdn_t ddns;
	failover_option_t vendor_class;
	failover_option_t vendor_options;

	int options_present;
} failover_message_t;

typedef struct {
	OMAPI_OBJECT_PREAMBLE;
	struct option_cache *peer_address;
	unsigned peer_port;
	int options_present;
	enum dhcp_flink_state {
		dhcp_flink_start,
		dhcp_flink_message_length_wait,
		dhcp_flink_message_wait,
		dhcp_flink_disconnected,
		dhcp_flink_state_max
	} state;
	failover_message_t *imsg;
	struct _dhcp_failover_state *state_object;
	u_int16_t imsg_len;
	unsigned imsg_count;
	u_int8_t imsg_payoff; /* Pay*load* offset. :') */
	u_int32_t xid;
} dhcp_failover_link_t;

typedef struct _dhcp_failover_listener {
	OMAPI_OBJECT_PREAMBLE;
	struct _dhcp_failover_listener *next;
	omapi_addr_t address;
} dhcp_failover_listener_t;
#endif /* FAILOVER_PROTOCOL */

/* A failover peer. */
enum failover_state {
	unknown_state,
	partner_down,
	normal,
	communications_interrupted,
	resolution_interrupted,
	potential_conflict,
	recover,
	recover_done,
	shut_down,
	paused,
	startup,
	recover_wait
};

/* Service states are simplifications of failover states, particularly
   useful because the startup state isn't actually implementable as a
   seperate failover state without maintaining a state stack. */

enum service_state {
	unknown_service_state,
	cooperating,
	not_cooperating,
	service_partner_down,
	not_responding,
	service_startup
};

#if defined (FAILOVER_PROTOCOL)
typedef struct _dhcp_failover_config {
	struct option_cache *address;
	int port;
	u_int32_t max_flying_updates;
	enum failover_state state;
	TIME stos;
	u_int32_t max_response_delay;
} dhcp_failover_config_t;

typedef struct _dhcp_failover_state {
	OMAPI_OBJECT_PREAMBLE;
	struct _dhcp_failover_state *next;
	char *name;			/* Name of this failover instance. */
	dhcp_failover_config_t me;	/* My configuration. */
	dhcp_failover_config_t partner;	/* Partner's configuration. */
	enum failover_state saved_state; /* Saved state during startup. */
	struct data_string server_identifier; /* Server identifier (IP addr) */
	u_int32_t mclt;

	u_int8_t *hba;	/* Hash bucket array for load balancing. */
	int load_balance_max_secs;

	enum service_state service_state;
	const char *nrr;	/* Printable reason why we're in the
				   not_responding service state (empty
				   string if we are responding. */

	dhcp_failover_link_t *link_to_peer;	/* Currently-established link
						   to peer. */

	enum {
		primary, secondary
	} i_am;		/* We are primary or secondary in this relationship. */

	TIME last_packet_sent;		/* Timestamp on last packet we sent. */
	TIME last_timestamp_received;	/* The last timestamp we sent that
					   has been returned by our partner. */
	TIME skew;	/* The skew between our clock and our partner's. */
	struct lease *update_queue_head; /* List of leases we haven't sent
					    to peer. */
	struct lease *update_queue_tail;

	struct lease *ack_queue_head;	/* List of lease updates the peer
					   hasn't yet acked. */
	struct lease *ack_queue_tail;

	struct lease *send_update_done;	/* When we get a BNDACK for this
					   lease, send an UPDDONE message. */
	int cur_unacked_updates;	/* Number of updates we've sent
					   that have not yet been acked. */

					/* List of messages which we haven't
					   acked yet. */
	failover_message_t *toack_queue_head;
	failover_message_t *toack_queue_tail;
	int pending_acks;		/* Number of messages in the toack
					   queue. */
	int pool_count;			/* Number of pools referencing this
					   failover state object. */
} dhcp_failover_state_t;

#define DHCP_FAILOVER_VERSION		1
#endif /* FAILOVER_PROTOCOL */