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[mle] clear tag only on a "Child Update Req" Rx from a detached child (#6445)

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This commit changes the `MleRouter::HandleChildUpdateRequest()` to
clear the "last rx fragment tag" only if the "Child Update Request" is
from a detached child trying to restore its link with its parent. This
is indicated by the presence of Challenge TLV in the received message.
The "last rx fragment tag" is used for duplicate frame detection when
`MULTI_RADIO` is enabled.
This commit is contained in:
Abtin Keshavarzian
2021-04-29 16:55:11 -07:00
committed by GitHub
parent fb7ce6232e
commit 55cb49160f
2 changed files with 10 additions and 2 deletions
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src/core/thread/mle.cpp
+2 -1
View File
@@ -3598,6 +3598,7 @@ void Mle::HandleChildUpdateRequest(const Message &aMessage, const Ip6::MessageIn
tlvs[numTlvs++] = Tlv::kLinkFrameCounter;
break;
case kErrorNotFound:
challenge.mLength = 0;
break;
default:
ExitNow(error = kErrorParse);
@@ -3655,7 +3656,7 @@ void Mle::HandleChildUpdateRequest(const Message &aMessage, const Ip6::MessageIn
}
#if OPENTHREAD_CONFIG_MULTI_RADIO
if (aNeighbor != nullptr)
if ((aNeighbor != nullptr) && (challenge.mLength != 0))
{
aNeighbor->ClearLastRxFragmentTag();
}
src/core/thread/mle_router.cpp
+8 -1
View File
@@ -2507,7 +2507,14 @@ void MleRouter::HandleChildUpdateRequest(const Message & aMessage,
}
#if OPENTHREAD_CONFIG_MULTI_RADIO
child->ClearLastRxFragmentTag();
// We clear the fragment tag only if the "Child Update Request" is
// from a detached child trying to restore its link with its
// parent which is indicated by the presence of Challenge TLV in
// the message.
if (challenge.mLength != 0)
{
child->ClearLastRxFragmentTag();
}
#endif
SendChildUpdateResponse(child, aMessageInfo, tlvs, tlvslength, challenge);