summaryrefslogtreecommitdiff
path: root/src/libcharon/encoding/payloads/ts_payload.c
blob: 0b2d4de57703b592785736d5d6dc29e073db23c9 (plain)
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
/*
 * Copyright (C) 2005-2010 Martin Willi
 * Copyright (C) 2010 revosec AG
 * Copyright (C) 2005 Jan Hutter
 * Hochschule fuer Technik Rapperswil
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

#include <stddef.h>

#include "ts_payload.h"

#include <encoding/payloads/encodings.h>
#include <collections/linked_list.h>

typedef struct private_ts_payload_t private_ts_payload_t;

/**
 * Private data of an ts_payload_t object.
 */
struct private_ts_payload_t {

	/**
	 * Public ts_payload_t interface.
	 */
	ts_payload_t public;

	/**
	 * TRUE if this TS payload is of type TSi, FALSE for TSr.
	 */
	bool is_initiator;

	/**
	 * Next payload type.
	 */
	uint8_t  next_payload;

	/**
	 * Critical flag.
	 */
	bool critical;

	/**
	 * reserved bits
	 */
	bool reserved_bit[7];

	/**
	 * reserved bytes
	 */
	bool reserved_byte[3];

	/**
	 * Length of this payload.
	 */
	uint16_t payload_length;

	/**
	 * Number of traffic selectors
	 */
	uint8_t ts_num;

	/**
	 * Contains the traffic selectors of type traffic_selector_substructure_t.
	 */
	linked_list_t *substrs;
};

/**
 * Encoding rules to parse or generate a TS payload
 *
 * The defined offsets are the positions in a object of type
 * private_ts_payload_t.
 */
static encoding_rule_t encodings[] = {
	/* 1 Byte next payload type, stored in the field next_payload */
	{ U_INT_8,			offsetof(private_ts_payload_t, next_payload)	},
	/* the critical bit */
	{ FLAG,				offsetof(private_ts_payload_t, critical)		},
	/* 7 Bit reserved bits */
	{ RESERVED_BIT,		offsetof(private_ts_payload_t, reserved_bit[0])	},
	{ RESERVED_BIT,		offsetof(private_ts_payload_t, reserved_bit[1])	},
	{ RESERVED_BIT,		offsetof(private_ts_payload_t, reserved_bit[2])	},
	{ RESERVED_BIT,		offsetof(private_ts_payload_t, reserved_bit[3])	},
	{ RESERVED_BIT,		offsetof(private_ts_payload_t, reserved_bit[4])	},
	{ RESERVED_BIT,		offsetof(private_ts_payload_t, reserved_bit[5])	},
	{ RESERVED_BIT,		offsetof(private_ts_payload_t, reserved_bit[6])	},
	/* Length of the whole payload*/
	{ PAYLOAD_LENGTH,	offsetof(private_ts_payload_t, payload_length)	},
	/* 1 Byte TS type*/
	{ U_INT_8,			offsetof(private_ts_payload_t, ts_num)			},
	/* 3 reserved bytes */
	{ RESERVED_BYTE,	offsetof(private_ts_payload_t, reserved_byte[0])},
	{ RESERVED_BYTE,	offsetof(private_ts_payload_t, reserved_byte[1])},
	{ RESERVED_BYTE,	offsetof(private_ts_payload_t, reserved_byte[2])},
	/* wrapped list of traffic selectors substructures */
	{ PAYLOAD_LIST + PLV2_TRAFFIC_SELECTOR_SUBSTRUCTURE,
						offsetof(private_ts_payload_t, substrs)			},
};

/*
                           1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      ! Next Payload  !C!  RESERVED   !         Payload Length        !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      ! Number of TSs !                 RESERVED                      !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      !                                                               !
      ~                       <Traffic Selectors>                     ~
      !                                                               !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/

METHOD(payload_t, verify, status_t,
	private_ts_payload_t *this)
{
	enumerator_t *enumerator;
	payload_t *substr;
	status_t status = SUCCESS;

	if (this->ts_num != this->substrs->get_count(this->substrs))
	{
		return FAILED;
	}
	enumerator = this->substrs->create_enumerator(this->substrs);
	while (enumerator->enumerate(enumerator, &substr))
	{
		status = substr->verify(substr);
		if (status != SUCCESS)
		{
			break;
		}
	}
	enumerator->destroy(enumerator);

	return status;
}

METHOD(payload_t, get_encoding_rules, int,
	private_ts_payload_t *this, encoding_rule_t **rules)
{
	*rules = encodings;
	return countof(encodings);
}

METHOD(payload_t, get_header_length, int,
	private_ts_payload_t *this)
{
	return 8;
}

METHOD(payload_t, get_type, payload_type_t,
	private_ts_payload_t *this)
{
	if (this->is_initiator)
	{
		return PLV2_TS_INITIATOR;
	}
	return PLV2_TS_RESPONDER;
}

METHOD(payload_t, get_next_type, payload_type_t,
	private_ts_payload_t *this)
{
	return this->next_payload;
}

METHOD(payload_t, set_next_type, void,
	private_ts_payload_t *this,payload_type_t type)
{
	this->next_payload = type;
}

/**
 * recompute the length of the payload.
 */
static void compute_length(private_ts_payload_t *this)
{
	enumerator_t *enumerator;
	payload_t *subst;

	this->payload_length = get_header_length(this);
	this->ts_num = 0;
	enumerator = this->substrs->create_enumerator(this->substrs);
	while (enumerator->enumerate(enumerator, &subst))
	{
		this->payload_length += subst->get_length(subst);
		this->ts_num++;
	}
	enumerator->destroy(enumerator);
}

METHOD(payload_t, get_length, size_t,
	private_ts_payload_t *this)
{
	return this->payload_length;
}

METHOD(ts_payload_t, get_initiator, bool,
	private_ts_payload_t *this)
{
	return this->is_initiator;
}

METHOD(ts_payload_t, set_initiator, void,
	private_ts_payload_t *this,bool is_initiator)
{
	this->is_initiator = is_initiator;
}

METHOD(ts_payload_t, get_traffic_selectors, linked_list_t*,
	private_ts_payload_t *this)
{
	traffic_selector_t *ts;
	enumerator_t *enumerator;
	traffic_selector_substructure_t *subst;
	linked_list_t *list;

	list = linked_list_create();
	enumerator = this->substrs->create_enumerator(this->substrs);
	while (enumerator->enumerate(enumerator, &subst))
	{
		ts = subst->get_traffic_selector(subst);
		list->insert_last(list, ts);
	}
	enumerator->destroy(enumerator);

	return list;
}

METHOD2(payload_t, ts_payload_t, destroy, void,
	private_ts_payload_t *this)
{
	this->substrs->destroy_offset(this->substrs, offsetof(payload_t, destroy));
	free(this);
}

/*
 * Described in header
 */
ts_payload_t *ts_payload_create(bool is_initiator)
{
	private_ts_payload_t *this;

	INIT(this,
		.public = {
			.payload_interface = {
				.verify = _verify,
				.get_encoding_rules = _get_encoding_rules,
				.get_header_length = _get_header_length,
				.get_length = _get_length,
				.get_next_type = _get_next_type,
				.set_next_type = _set_next_type,
				.get_type = _get_type,
				.destroy = _destroy,
			},
			.get_initiator = _get_initiator,
			.set_initiator = _set_initiator,
			.get_traffic_selectors = _get_traffic_selectors,
			.destroy = _destroy,
		},
		.next_payload = PL_NONE,
		.payload_length = get_header_length(this),
		.is_initiator = is_initiator,
		.substrs = linked_list_create(),
	);
	return &this->public;
}

/*
 * Described in header
 */
ts_payload_t *ts_payload_create_from_traffic_selectors(bool is_initiator,
											linked_list_t *traffic_selectors)
{
	enumerator_t *enumerator;
	traffic_selector_t *ts;
	traffic_selector_substructure_t *subst;
	private_ts_payload_t *this;

	this = (private_ts_payload_t*)ts_payload_create(is_initiator);

	enumerator = traffic_selectors->create_enumerator(traffic_selectors);
	while (enumerator->enumerate(enumerator, &ts))
	{
		subst = traffic_selector_substructure_create_from_traffic_selector(ts);
		this->substrs->insert_last(this->substrs, subst);
	}
	enumerator->destroy(enumerator);
	compute_length(this);

	return &this->public;
}