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1.1 misho 1: /*
2: * Copyright (C) 2012-2015 Andreas Steffen
3: * HSR Hochschule fuer Technik Rapperswil
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #include "ietf_attr_fwd_enabled.h"
17:
18: #include <pa_tnc/pa_tnc_msg.h>
19: #include <bio/bio_writer.h>
20: #include <bio/bio_reader.h>
21: #include <utils/debug.h>
22:
23: typedef struct private_ietf_attr_fwd_enabled_t private_ietf_attr_fwd_enabled_t;
24:
25: /**
26: * PA-TNC Forwarding Enabled type (see section 4.2.11 of RFC 5792)
27: *
28: * 1 2 3
29: * 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
30: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
31: * | Forwarding Enabled |
32: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
33: */
34:
35: #define FORWARDING_ENABLED_SIZE 4
36:
37: /**
38: * Private data of an ietf_attr_fwd_enabled_t object.
39: */
40: struct private_ietf_attr_fwd_enabled_t {
41:
42: /**
43: * Public members of ietf_attr_fwd_enabled_t
44: */
45: ietf_attr_fwd_enabled_t public;
46:
47: /**
48: * Vendor-specific attribute type
49: */
50: pen_type_t type;
51:
52: /**
53: * Length of attribute value
54: */
55: size_t length;
56:
57: /**
58: * Attribute value or segment
59: */
60: chunk_t value;
61:
62: /**
63: * Noskip flag
64: */
65: bool noskip_flag;
66:
67: /**
68: * Forwarding Enabled status
69: */
70: os_fwd_status_t fwd_status;
71:
72: /**
73: * Reference count
74: */
75: refcount_t ref;
76: };
77:
78: METHOD(pa_tnc_attr_t, get_type, pen_type_t,
79: private_ietf_attr_fwd_enabled_t *this)
80: {
81: return this->type;
82: }
83:
84: METHOD(pa_tnc_attr_t, get_value, chunk_t,
85: private_ietf_attr_fwd_enabled_t *this)
86: {
87: return this->value;
88: }
89:
90: METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
91: private_ietf_attr_fwd_enabled_t *this)
92: {
93: return this->noskip_flag;
94: }
95:
96: METHOD(pa_tnc_attr_t, set_noskip_flag,void,
97: private_ietf_attr_fwd_enabled_t *this, bool noskip)
98: {
99: this->noskip_flag = noskip;
100: }
101:
102: METHOD(pa_tnc_attr_t, build, void,
103: private_ietf_attr_fwd_enabled_t *this)
104: {
105: bio_writer_t *writer;
106:
107: if (this->value.ptr)
108: {
109: return;
110: }
111: writer = bio_writer_create(FORWARDING_ENABLED_SIZE);
112: writer->write_uint32(writer, this->fwd_status);
113:
114: this->value = writer->extract_buf(writer);
115: this->length = this->value.len;
116: writer->destroy(writer);
117: }
118:
119: METHOD(pa_tnc_attr_t, process, status_t,
120: private_ietf_attr_fwd_enabled_t *this, uint32_t *offset)
121: {
122: bio_reader_t *reader;
123: uint32_t fwd_status;
124:
125: *offset = 0;
126:
127: if (this->value.len < this->length)
128: {
129: return NEED_MORE;
130: }
131: if (this->value.len != FORWARDING_ENABLED_SIZE)
132: {
133: DBG1(DBG_TNC, "incorrect size for IETF forwarding enabled attribute");
134: return FAILED;
135: }
136: reader = bio_reader_create(this->value);
137: reader->read_uint32(reader, &fwd_status);
138: reader->destroy(reader);
139:
140: if (fwd_status > OS_FWD_UNKNOWN)
141: {
142: DBG1(DBG_TNC, "IETF forwarding enabled field has unknown value %u",
143: fwd_status);
144: return FAILED;
145: }
146: this->fwd_status = fwd_status;
147:
148: return SUCCESS;
149: }
150:
151: METHOD(pa_tnc_attr_t, add_segment, void,
152: private_ietf_attr_fwd_enabled_t *this, chunk_t segment)
153: {
154: this->value = chunk_cat("mc", this->value, segment);
155: }
156:
157: METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
158: private_ietf_attr_fwd_enabled_t *this)
159: {
160: ref_get(&this->ref);
161: return &this->public.pa_tnc_attribute;
162: }
163:
164: METHOD(pa_tnc_attr_t, destroy, void,
165: private_ietf_attr_fwd_enabled_t *this)
166: {
167: if (ref_put(&this->ref))
168: {
169: free(this->value.ptr);
170: free(this);
171: }
172: }
173:
174: METHOD(ietf_attr_fwd_enabled_t, get_status, os_fwd_status_t,
175: private_ietf_attr_fwd_enabled_t *this)
176: {
177: return this->fwd_status;
178: }
179:
180: /**
181: * Described in header.
182: */
183: pa_tnc_attr_t *ietf_attr_fwd_enabled_create(os_fwd_status_t fwd_status,
184: pen_type_t type)
185: {
186: private_ietf_attr_fwd_enabled_t *this;
187:
188: INIT(this,
189: .public = {
190: .pa_tnc_attribute = {
191: .get_type = _get_type,
192: .get_value = _get_value,
193: .get_noskip_flag = _get_noskip_flag,
194: .set_noskip_flag = _set_noskip_flag,
195: .build = _build,
196: .process = _process,
197: .add_segment = _add_segment,
198: .get_ref = _get_ref,
199: .destroy = _destroy,
200: },
201: .get_status = _get_status,
202: },
203: .type = type,
204: .fwd_status = fwd_status,
205: .ref = 1,
206: );
207:
208: return &this->public.pa_tnc_attribute;
209: }
210:
211: /**
212: * Described in header.
213: */
214: pa_tnc_attr_t *ietf_attr_fwd_enabled_create_from_data(size_t length,
215: chunk_t data, pen_type_t type)
216: {
217: private_ietf_attr_fwd_enabled_t *this;
218:
219: INIT(this,
220: .public = {
221: .pa_tnc_attribute = {
222: .get_type = _get_type,
223: .get_value = _get_value,
224: .get_noskip_flag = _get_noskip_flag,
225: .set_noskip_flag = _set_noskip_flag,
226: .build = _build,
227: .process = _process,
228: .add_segment = _add_segment,
229: .get_ref = _get_ref,
230: .destroy = _destroy,
231: },
232: .get_status = _get_status,
233: },
234: .type = type,
235: .length = length,
236: .value = chunk_clone(data),
237: .ref = 1,
238: );
239:
240: return &this->public.pa_tnc_attribute;
241: }
242: