Annotation of embedaddon/strongswan/src/libcharon/encoding/payloads/ts_payload.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2005-2010 Martin Willi
3: * Copyright (C) 2010 revosec AG
4: * Copyright (C) 2005 Jan Hutter
5: * HSR Hochschule fuer Technik Rapperswil
6: *
7: * This program is free software; you can redistribute it and/or modify it
8: * under the terms of the GNU General Public License as published by the
9: * Free Software Foundation; either version 2 of the License, or (at your
10: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
11: *
12: * This program is distributed in the hope that it will be useful, but
13: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15: * for more details.
16: */
17:
18: #include <stddef.h>
19:
20: #include "ts_payload.h"
21:
22: #include <encoding/payloads/encodings.h>
23: #include <collections/linked_list.h>
24:
25: typedef struct private_ts_payload_t private_ts_payload_t;
26:
27: /**
28: * Private data of an ts_payload_t object.
29: */
30: struct private_ts_payload_t {
31:
32: /**
33: * Public ts_payload_t interface.
34: */
35: ts_payload_t public;
36:
37: /**
38: * TRUE if this TS payload is of type TSi, FALSE for TSr.
39: */
40: bool is_initiator;
41:
42: /**
43: * Next payload type.
44: */
45: uint8_t next_payload;
46:
47: /**
48: * Critical flag.
49: */
50: bool critical;
51:
52: /**
53: * reserved bits
54: */
55: bool reserved_bit[7];
56:
57: /**
58: * reserved bytes
59: */
60: bool reserved_byte[3];
61:
62: /**
63: * Length of this payload.
64: */
65: uint16_t payload_length;
66:
67: /**
68: * Number of traffic selectors
69: */
70: uint8_t ts_num;
71:
72: /**
73: * Contains the traffic selectors of type traffic_selector_substructure_t.
74: */
75: linked_list_t *substrs;
76: };
77:
78: /**
79: * Encoding rules to parse or generate a TS payload
80: *
81: * The defined offsets are the positions in a object of type
82: * private_ts_payload_t.
83: */
84: static encoding_rule_t encodings[] = {
85: /* 1 Byte next payload type, stored in the field next_payload */
86: { U_INT_8, offsetof(private_ts_payload_t, next_payload) },
87: /* the critical bit */
88: { FLAG, offsetof(private_ts_payload_t, critical) },
89: /* 7 Bit reserved bits */
90: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[0]) },
91: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[1]) },
92: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[2]) },
93: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[3]) },
94: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[4]) },
95: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[5]) },
96: { RESERVED_BIT, offsetof(private_ts_payload_t, reserved_bit[6]) },
97: /* Length of the whole payload*/
98: { PAYLOAD_LENGTH, offsetof(private_ts_payload_t, payload_length) },
99: /* 1 Byte TS type*/
100: { U_INT_8, offsetof(private_ts_payload_t, ts_num) },
101: /* 3 reserved bytes */
102: { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[0])},
103: { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[1])},
104: { RESERVED_BYTE, offsetof(private_ts_payload_t, reserved_byte[2])},
105: /* wrapped list of traffic selectors substructures */
106: { PAYLOAD_LIST + PLV2_TRAFFIC_SELECTOR_SUBSTRUCTURE,
107: offsetof(private_ts_payload_t, substrs) },
108: };
109:
110: /*
111: 1 2 3
112: 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
113: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
114: ! Next Payload !C! RESERVED ! Payload Length !
115: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
116: ! Number of TSs ! RESERVED !
117: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
118: ! !
119: ~ <Traffic Selectors> ~
120: ! !
121: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
122: */
123:
124: METHOD(payload_t, verify, status_t,
125: private_ts_payload_t *this)
126: {
127: enumerator_t *enumerator;
128: payload_t *substr;
129: status_t status = SUCCESS;
130:
131: if (this->ts_num != this->substrs->get_count(this->substrs))
132: {
133: return FAILED;
134: }
135: enumerator = this->substrs->create_enumerator(this->substrs);
136: while (enumerator->enumerate(enumerator, &substr))
137: {
138: status = substr->verify(substr);
139: if (status != SUCCESS)
140: {
141: break;
142: }
143: }
144: enumerator->destroy(enumerator);
145:
146: return status;
147: }
148:
149: METHOD(payload_t, get_encoding_rules, int,
150: private_ts_payload_t *this, encoding_rule_t **rules)
151: {
152: *rules = encodings;
153: return countof(encodings);
154: }
155:
156: METHOD(payload_t, get_header_length, int,
157: private_ts_payload_t *this)
158: {
159: return 8;
160: }
161:
162: METHOD(payload_t, get_type, payload_type_t,
163: private_ts_payload_t *this)
164: {
165: if (this->is_initiator)
166: {
167: return PLV2_TS_INITIATOR;
168: }
169: return PLV2_TS_RESPONDER;
170: }
171:
172: METHOD(payload_t, get_next_type, payload_type_t,
173: private_ts_payload_t *this)
174: {
175: return this->next_payload;
176: }
177:
178: METHOD(payload_t, set_next_type, void,
179: private_ts_payload_t *this,payload_type_t type)
180: {
181: this->next_payload = type;
182: }
183:
184: /**
185: * recompute the length of the payload.
186: */
187: static void compute_length(private_ts_payload_t *this)
188: {
189: enumerator_t *enumerator;
190: payload_t *subst;
191:
192: this->payload_length = get_header_length(this);
193: this->ts_num = 0;
194: enumerator = this->substrs->create_enumerator(this->substrs);
195: while (enumerator->enumerate(enumerator, &subst))
196: {
197: this->payload_length += subst->get_length(subst);
198: this->ts_num++;
199: }
200: enumerator->destroy(enumerator);
201: }
202:
203: METHOD(payload_t, get_length, size_t,
204: private_ts_payload_t *this)
205: {
206: return this->payload_length;
207: }
208:
209: METHOD(ts_payload_t, get_initiator, bool,
210: private_ts_payload_t *this)
211: {
212: return this->is_initiator;
213: }
214:
215: METHOD(ts_payload_t, set_initiator, void,
216: private_ts_payload_t *this,bool is_initiator)
217: {
218: this->is_initiator = is_initiator;
219: }
220:
221: METHOD(ts_payload_t, get_traffic_selectors, linked_list_t*,
222: private_ts_payload_t *this)
223: {
224: traffic_selector_t *ts;
225: enumerator_t *enumerator;
226: traffic_selector_substructure_t *subst;
227: linked_list_t *list;
228:
229: list = linked_list_create();
230: enumerator = this->substrs->create_enumerator(this->substrs);
231: while (enumerator->enumerate(enumerator, &subst))
232: {
233: ts = subst->get_traffic_selector(subst);
234: list->insert_last(list, ts);
235: }
236: enumerator->destroy(enumerator);
237:
238: return list;
239: }
240:
241: METHOD2(payload_t, ts_payload_t, destroy, void,
242: private_ts_payload_t *this)
243: {
244: this->substrs->destroy_offset(this->substrs, offsetof(payload_t, destroy));
245: free(this);
246: }
247:
248: /*
249: * Described in header
250: */
251: ts_payload_t *ts_payload_create(bool is_initiator)
252: {
253: private_ts_payload_t *this;
254:
255: INIT(this,
256: .public = {
257: .payload_interface = {
258: .verify = _verify,
259: .get_encoding_rules = _get_encoding_rules,
260: .get_header_length = _get_header_length,
261: .get_length = _get_length,
262: .get_next_type = _get_next_type,
263: .set_next_type = _set_next_type,
264: .get_type = _get_type,
265: .destroy = _destroy,
266: },
267: .get_initiator = _get_initiator,
268: .set_initiator = _set_initiator,
269: .get_traffic_selectors = _get_traffic_selectors,
270: .destroy = _destroy,
271: },
272: .next_payload = PL_NONE,
273: .payload_length = get_header_length(this),
274: .is_initiator = is_initiator,
275: .substrs = linked_list_create(),
276: );
277: return &this->public;
278: }
279:
280: /*
281: * Described in header
282: */
283: ts_payload_t *ts_payload_create_from_traffic_selectors(bool is_initiator,
284: linked_list_t *traffic_selectors)
285: {
286: enumerator_t *enumerator;
287: traffic_selector_t *ts;
288: traffic_selector_substructure_t *subst;
289: private_ts_payload_t *this;
290:
291: this = (private_ts_payload_t*)ts_payload_create(is_initiator);
292:
293: enumerator = traffic_selectors->create_enumerator(traffic_selectors);
294: while (enumerator->enumerate(enumerator, &ts))
295: {
296: subst = traffic_selector_substructure_create_from_traffic_selector(ts);
297: this->substrs->insert_last(this->substrs, subst);
298: }
299: enumerator->destroy(enumerator);
300: compute_length(this);
301:
302: return &this->public;
303: }
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