1 /*
2 * Copyright (c) 2016, 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 the PAN ID Query Server.
32 */
33
34 #include "panid_query_server.hpp"
35
36 #include "coap/coap_message.hpp"
37 #include "common/as_core_type.hpp"
38 #include "common/code_utils.hpp"
39 #include "common/debug.hpp"
40 #include "common/locator_getters.hpp"
41 #include "common/log.hpp"
42 #include "instance/instance.hpp"
43 #include "meshcop/meshcop.hpp"
44 #include "meshcop/meshcop_tlvs.hpp"
45 #include "thread/thread_netif.hpp"
46 #include "thread/uri_paths.hpp"
47
48 namespace ot {
49
50 RegisterLogModule("MeshCoP");
51
PanIdQueryServer(Instance & aInstance)52 PanIdQueryServer::PanIdQueryServer(Instance &aInstance)
53 : InstanceLocator(aInstance)
54 , mChannelMask(0)
55 , mPanId(Mac::kPanIdBroadcast)
56 , mTimer(aInstance)
57 {
58 }
59
60 template <>
HandleTmf(Coap::Message & aMessage,const Ip6::MessageInfo & aMessageInfo)61 void PanIdQueryServer::HandleTmf<kUriPanIdQuery>(Coap::Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
62 {
63 uint16_t panId;
64 uint32_t mask;
65
66 VerifyOrExit(aMessage.IsPostRequest());
67 SuccessOrExit(MeshCoP::ChannelMaskTlv::FindIn(aMessage, mask));
68
69 SuccessOrExit(Tlv::Find<MeshCoP::PanIdTlv>(aMessage, panId));
70
71 mChannelMask = mask;
72 mCommissioner = aMessageInfo.GetPeerAddr();
73 mPanId = panId;
74 mTimer.Start(kScanDelay);
75
76 if (aMessage.IsConfirmable() && !aMessageInfo.GetSockAddr().IsMulticast())
77 {
78 SuccessOrExit(Get<Tmf::Agent>().SendEmptyAck(aMessage, aMessageInfo));
79 LogInfo("Sent %s ack", UriToString<kUriPanIdQuery>());
80 }
81
82 exit:
83 return;
84 }
85
HandleScanResult(Mac::ActiveScanResult * aScanResult,void * aContext)86 void PanIdQueryServer::HandleScanResult(Mac::ActiveScanResult *aScanResult, void *aContext)
87 {
88 static_cast<PanIdQueryServer *>(aContext)->HandleScanResult(aScanResult);
89 }
90
HandleScanResult(Mac::ActiveScanResult * aScanResult)91 void PanIdQueryServer::HandleScanResult(Mac::ActiveScanResult *aScanResult)
92 {
93 if (aScanResult != nullptr)
94 {
95 if (aScanResult->mPanId == mPanId)
96 {
97 mChannelMask |= 1 << aScanResult->mChannel;
98 }
99 }
100 else if (mChannelMask != 0)
101 {
102 SendConflict();
103 }
104 }
105
SendConflict(void)106 void PanIdQueryServer::SendConflict(void)
107 {
108 Error error = kErrorNone;
109 Tmf::MessageInfo messageInfo(GetInstance());
110 Coap::Message *message;
111
112 message = Get<Tmf::Agent>().NewPriorityConfirmablePostMessage(kUriPanIdConflict);
113 VerifyOrExit(message != nullptr, error = kErrorNoBufs);
114
115 SuccessOrExit(error = MeshCoP::ChannelMaskTlv::AppendTo(*message, mChannelMask));
116
117 SuccessOrExit(error = Tlv::Append<MeshCoP::PanIdTlv>(*message, mPanId));
118
119 messageInfo.SetSockAddrToRlocPeerAddrTo(mCommissioner);
120
121 SuccessOrExit(error = Get<Tmf::Agent>().SendMessage(*message, messageInfo));
122
123 LogInfo("Sent %s", UriToString<kUriPanIdConflict>());
124
125 exit:
126 FreeMessageOnError(message, error);
127 LogWarnOnError(error, "send panid conflict");
128 }
129
HandleTimer(void)130 void PanIdQueryServer::HandleTimer(void)
131 {
132 IgnoreError(Get<Mac::Mac>().ActiveScan(mChannelMask, 0, HandleScanResult, this));
133 mChannelMask = 0;
134 }
135
136 } // namespace ot
137
