1 /*
2 * Copyright (c) 2021, 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 Anycast Locator functionality.
32 */
33
34 #include "anycast_locator.hpp"
35
36 #if OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_ENABLE
37
38 #include "common/as_core_type.hpp"
39 #include "common/code_utils.hpp"
40 #include "common/instance.hpp"
41 #include "common/locator_getters.hpp"
42 #include "thread/thread_tlvs.hpp"
43 #include "thread/uri_paths.hpp"
44
45 namespace ot {
46
AnycastLocator(Instance & aInstance)47 AnycastLocator::AnycastLocator(Instance &aInstance)
48 : InstanceLocator(aInstance)
49
50 {
51 }
52
Locate(const Ip6::Address & aAnycastAddress,LocatorCallback aCallback,void * aContext)53 Error AnycastLocator::Locate(const Ip6::Address &aAnycastAddress, LocatorCallback aCallback, void *aContext)
54 {
55 Error error = kErrorNone;
56 Coap::Message *message = nullptr;
57 Tmf::MessageInfo messageInfo(GetInstance());
58
59 VerifyOrExit((aCallback != nullptr) && Get<Mle::Mle>().IsAnycastLocator(aAnycastAddress),
60 error = kErrorInvalidArgs);
61
62 message = Get<Tmf::Agent>().NewConfirmablePostMessage(kUriAnycastLocate);
63 VerifyOrExit(message != nullptr, error = kErrorNoBufs);
64
65 if (mCallback.IsSet())
66 {
67 IgnoreError(Get<Tmf::Agent>().AbortTransaction(HandleResponse, this));
68 }
69
70 messageInfo.SetSockAddrToRlocPeerAddrTo(aAnycastAddress);
71
72 SuccessOrExit(error = Get<Tmf::Agent>().SendMessage(*message, messageInfo, HandleResponse, this));
73
74 mCallback.Set(aCallback, aContext);
75
76 exit:
77 FreeMessageOnError(message, error);
78 return error;
79 }
80
HandleResponse(void * aContext,otMessage * aMessage,const otMessageInfo * aMessageInfo,Error aError)81 void AnycastLocator::HandleResponse(void *aContext,
82 otMessage *aMessage,
83 const otMessageInfo *aMessageInfo,
84 Error aError)
85 {
86 static_cast<AnycastLocator *>(aContext)->HandleResponse(AsCoapMessagePtr(aMessage), AsCoreTypePtr(aMessageInfo),
87 aError);
88 }
89
HandleResponse(Coap::Message * aMessage,const Ip6::MessageInfo * aMessageInfo,Error aError)90 void AnycastLocator::HandleResponse(Coap::Message *aMessage, const Ip6::MessageInfo *aMessageInfo, Error aError)
91 {
92 OT_UNUSED_VARIABLE(aMessageInfo);
93
94 uint16_t rloc16 = Mac::kShortAddrInvalid;
95 const Ip6::Address *address = nullptr;
96 Ip6::Address meshLocalAddress;
97
98 SuccessOrExit(aError);
99 OT_ASSERT(aMessage != nullptr);
100
101 meshLocalAddress.SetPrefix(Get<Mle::Mle>().GetMeshLocalPrefix());
102 SuccessOrExit(Tlv::Find<ThreadMeshLocalEidTlv>(*aMessage, meshLocalAddress.GetIid()));
103 SuccessOrExit(Tlv::Find<ThreadRloc16Tlv>(*aMessage, rloc16));
104
105 #if OPENTHREAD_FTD
106 Get<AddressResolver>().UpdateSnoopedCacheEntry(meshLocalAddress, rloc16, Get<Mac::Mac>().GetShortAddress());
107 #endif
108
109 address = &meshLocalAddress;
110
111 exit:
112 if (mCallback.IsSet())
113 {
114 Callback<LocatorCallback> callbackCopy = mCallback;
115
116 mCallback.Clear();
117 callbackCopy.Invoke(aError, address, rloc16);
118 }
119 }
120
121 #if OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_SEND_RESPONSE
122
123 template <>
HandleTmf(Coap::Message & aMessage,const Ip6::MessageInfo & aMessageInfo)124 void AnycastLocator::HandleTmf<kUriAnycastLocate>(Coap::Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
125 {
126 Coap::Message *message = nullptr;
127
128 VerifyOrExit(aMessage.IsConfirmablePostRequest());
129
130 message = Get<Tmf::Agent>().NewResponseMessage(aMessage);
131 VerifyOrExit(message != nullptr);
132
133 SuccessOrExit(Tlv::Append<ThreadMeshLocalEidTlv>(*message, Get<Mle::Mle>().GetMeshLocal64().GetIid()));
134 SuccessOrExit(Tlv::Append<ThreadRloc16Tlv>(*message, Get<Mle::Mle>().GetRloc16()));
135
136 SuccessOrExit(Get<Tmf::Agent>().SendMessage(*message, aMessageInfo));
137 message = nullptr;
138
139 exit:
140 FreeMessage(message);
141 }
142
143 #endif // OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_SEND_RESPONSE
144
145 } // namespace ot
146
147 #endif // OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_ENABLE
148
