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 "instance/instance.hpp"
39
40 namespace ot {
41
AnycastLocator(Instance & aInstance)42 AnycastLocator::AnycastLocator(Instance &aInstance)
43 : InstanceLocator(aInstance)
44
45 {
46 }
47
Locate(const Ip6::Address & aAnycastAddress,LocatorCallback aCallback,void * aContext)48 Error AnycastLocator::Locate(const Ip6::Address &aAnycastAddress, LocatorCallback aCallback, void *aContext)
49 {
50 Error error = kErrorNone;
51 Coap::Message *message = nullptr;
52 Tmf::MessageInfo messageInfo(GetInstance());
53
54 VerifyOrExit((aCallback != nullptr) && Get<Mle::Mle>().IsAnycastLocator(aAnycastAddress),
55 error = kErrorInvalidArgs);
56
57 message = Get<Tmf::Agent>().NewConfirmablePostMessage(kUriAnycastLocate);
58 VerifyOrExit(message != nullptr, error = kErrorNoBufs);
59
60 if (mCallback.IsSet())
61 {
62 IgnoreError(Get<Tmf::Agent>().AbortTransaction(HandleResponse, this));
63 }
64
65 messageInfo.SetSockAddrToRlocPeerAddrTo(aAnycastAddress);
66
67 SuccessOrExit(error = Get<Tmf::Agent>().SendMessage(*message, messageInfo, HandleResponse, this));
68
69 mCallback.Set(aCallback, aContext);
70
71 exit:
72 FreeMessageOnError(message, error);
73 return error;
74 }
75
HandleResponse(void * aContext,otMessage * aMessage,const otMessageInfo * aMessageInfo,otError aError)76 void AnycastLocator::HandleResponse(void *aContext,
77 otMessage *aMessage,
78 const otMessageInfo *aMessageInfo,
79 otError aError)
80 {
81 static_cast<AnycastLocator *>(aContext)->HandleResponse(AsCoapMessagePtr(aMessage), AsCoreTypePtr(aMessageInfo),
82 aError);
83 }
84
HandleResponse(Coap::Message * aMessage,const Ip6::MessageInfo * aMessageInfo,Error aError)85 void AnycastLocator::HandleResponse(Coap::Message *aMessage, const Ip6::MessageInfo *aMessageInfo, Error aError)
86 {
87 OT_UNUSED_VARIABLE(aMessageInfo);
88
89 uint16_t rloc16 = Mle::kInvalidRloc16;
90 const Ip6::Address *address = nullptr;
91 Ip6::Address meshLocalAddress;
92
93 SuccessOrExit(aError);
94 OT_ASSERT(aMessage != nullptr);
95
96 meshLocalAddress.SetPrefix(Get<Mle::Mle>().GetMeshLocalPrefix());
97 SuccessOrExit(Tlv::Find<ThreadMeshLocalEidTlv>(*aMessage, meshLocalAddress.GetIid()));
98 SuccessOrExit(Tlv::Find<ThreadRloc16Tlv>(*aMessage, rloc16));
99
100 #if OPENTHREAD_FTD
101 Get<AddressResolver>().UpdateSnoopedCacheEntry(meshLocalAddress, rloc16, Get<Mac::Mac>().GetShortAddress());
102 #endif
103
104 address = &meshLocalAddress;
105
106 exit:
107 mCallback.InvokeAndClearIfSet(aError, address, rloc16);
108 }
109
110 #if OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_SEND_RESPONSE
111
112 template <>
HandleTmf(Coap::Message & aMessage,const Ip6::MessageInfo & aMessageInfo)113 void AnycastLocator::HandleTmf<kUriAnycastLocate>(Coap::Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
114 {
115 Coap::Message *message = nullptr;
116
117 VerifyOrExit(aMessage.IsConfirmablePostRequest());
118
119 message = Get<Tmf::Agent>().NewResponseMessage(aMessage);
120 VerifyOrExit(message != nullptr);
121
122 SuccessOrExit(Tlv::Append<ThreadMeshLocalEidTlv>(*message, Get<Mle::Mle>().GetMeshLocalEid().GetIid()));
123 SuccessOrExit(Tlv::Append<ThreadRloc16Tlv>(*message, Get<Mle::Mle>().GetRloc16()));
124
125 SuccessOrExit(Get<Tmf::Agent>().SendMessage(*message, aMessageInfo));
126 message = nullptr;
127
128 exit:
129 FreeMessage(message);
130 }
131
132 #endif // OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_SEND_RESPONSE
133
134 } // namespace ot
135
136 #endif // OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_ENABLE
137
