1 /*
2 * Copyright (c) 2016-21, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file implements methods for generating and processing Thread Network Data TLVs.
32 */
33
34 #include "network_data_tlvs.hpp"
35
36 namespace ot {
37 namespace NetworkData {
38
39 //---------------------------------------------------------------------------------------------------------------------
40 // NetworkDataTlv
41
Find(const NetworkDataTlv * aStart,const NetworkDataTlv * aEnd,Type aType)42 const NetworkDataTlv *NetworkDataTlv::Find(const NetworkDataTlv *aStart, const NetworkDataTlv *aEnd, Type aType)
43 {
44 const NetworkDataTlv *tlv;
45
46 for (tlv = aStart; (tlv + 1 <= aEnd) && (tlv->GetNext() <= aEnd); tlv = tlv->GetNext())
47 {
48 if (tlv->GetType() == aType)
49 {
50 ExitNow();
51 }
52 }
53
54 tlv = nullptr;
55
56 exit:
57 return tlv;
58 }
59
Find(const NetworkDataTlv * aStart,const NetworkDataTlv * aEnd,Type aType,bool aStable)60 const NetworkDataTlv *NetworkDataTlv::Find(const NetworkDataTlv *aStart,
61 const NetworkDataTlv *aEnd,
62 Type aType,
63 bool aStable)
64 {
65 const NetworkDataTlv *tlv;
66
67 for (tlv = aStart; (tlv + 1 <= aEnd) && (tlv->GetNext() <= aEnd); tlv = tlv->GetNext())
68 {
69 if ((tlv->GetType() == aType) && (tlv->IsStable() == aStable))
70 {
71 ExitNow();
72 }
73 }
74
75 tlv = nullptr;
76
77 exit:
78 return tlv;
79 }
80
81 //---------------------------------------------------------------------------------------------------------------------
82 // PrefixTlv
83
FindSubTlv(Type aType) const84 const NetworkDataTlv *PrefixTlv::FindSubTlv(Type aType) const { return Find(GetSubTlvs(), GetNext(), aType); }
85
FindSubTlv(Type aType,bool aStable) const86 const NetworkDataTlv *PrefixTlv::FindSubTlv(Type aType, bool aStable) const
87 {
88 return Find(GetSubTlvs(), GetNext(), aType, aStable);
89 }
90
91 //---------------------------------------------------------------------------------------------------------------------
92 // ServiceTlv
93
Init(uint8_t aServiceId,uint32_t aEnterpriseNumber,const ServiceData & aServiceData)94 void ServiceTlv::Init(uint8_t aServiceId, uint32_t aEnterpriseNumber, const ServiceData &aServiceData)
95 {
96 NetworkDataTlv::Init();
97 SetType(kTypeService);
98
99 mFlagsServiceId = (aEnterpriseNumber == kThreadEnterpriseNumber) ? kThreadEnterpriseFlag : 0;
100 mFlagsServiceId |= (aServiceId & kServiceIdMask);
101
102 if (aEnterpriseNumber != kThreadEnterpriseNumber)
103 {
104 mShared.mEnterpriseNumber = BigEndian::HostSwap32(aEnterpriseNumber);
105 mServiceDataLength = aServiceData.GetLength();
106 aServiceData.CopyBytesTo(&mServiceDataLength + sizeof(uint8_t));
107 }
108 else
109 {
110 mShared.mServiceDataLengthThreadEnterprise = aServiceData.GetLength();
111 aServiceData.CopyBytesTo(&mShared.mServiceDataLengthThreadEnterprise + sizeof(uint8_t));
112 }
113
114 SetLength(GetFieldsLength());
115 }
116
117 //---------------------------------------------------------------------------------------------------------------------
118 // TlvIterator
119
Iterate(NetworkDataTlv::Type aType)120 const NetworkDataTlv *TlvIterator::Iterate(NetworkDataTlv::Type aType)
121 {
122 const NetworkDataTlv *tlv = NetworkDataTlv::Find(mStart, mEnd, aType);
123
124 VerifyOrExit(tlv != nullptr);
125 mStart = tlv->GetNext();
126
127 exit:
128 return tlv;
129 }
130
Iterate(NetworkDataTlv::Type aType,bool aStable)131 const NetworkDataTlv *TlvIterator::Iterate(NetworkDataTlv::Type aType, bool aStable)
132 {
133 const NetworkDataTlv *tlv = NetworkDataTlv::Find(mStart, mEnd, aType, aStable);
134
135 VerifyOrExit(tlv != nullptr);
136 mStart = tlv->GetNext();
137
138 exit:
139 return tlv;
140 }
141
142 } // namespace NetworkData
143 } // namespace ot
144
