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nest-open-source / nest-guard / 1.0 / openthread / refs/heads/master / . / src / core / thread / mle_router.cpp
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/*
* Copyright (c) 2016, The OpenThread Authors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file
* This file implements MLE functionality required for the Thread Router and Leader roles.
*/
#if OPENTHREAD_FTD
#define WPP_NAME "mle_router.tmh"
#include <openthread/config.h>
#include "mle_router.hpp"
#include <openthread/platform/random.h>
#include <openthread/platform/settings.h>
#include "openthread-instance.h"
#include "common/code_utils.hpp"
#include "common/debug.hpp"
#include "common/encoding.hpp"
#include "common/logging.hpp"
#include "common/settings.hpp"
#include "mac/mac_frame.hpp"
#include "net/icmp6.hpp"
#include "thread/thread_netif.hpp"
#include "thread/thread_tlvs.hpp"
#include "thread/thread_uri_paths.hpp"
using ot::Encoding::BigEndian::HostSwap16;
namespace ot {
namespace Mle {
MleRouter::MleRouter(ThreadNetif &aThreadNetif):
Mle(aThreadNetif),
mAdvertiseTimer(aThreadNetif.GetIp6().mTimerScheduler, &MleRouter::HandleAdvertiseTimer, NULL, this),
mStateUpdateTimer(aThreadNetif.GetIp6().mTimerScheduler, &MleRouter::HandleStateUpdateTimer, this),
mAddressSolicit(OT_URI_PATH_ADDRESS_SOLICIT, &MleRouter::HandleAddressSolicit, this),
mAddressRelease(OT_URI_PATH_ADDRESS_RELEASE, &MleRouter::HandleAddressRelease, this),
mRouterIdSequence(0),
mRouterIdSequenceLastUpdated(0),
mMaxChildrenAllowed(kMaxChildren),
mChallengeTimeout(0),
mNextChildId(kMaxChildId),
mNetworkIdTimeout(kNetworkIdTimeout),
mRouterUpgradeThreshold(kRouterUpgradeThreshold),
mRouterDowngradeThreshold(kRouterDowngradeThreshold),
mLeaderWeight(kLeaderWeight),
mFixedLeaderPartitionId(0),
mRouterRoleEnabled(true),
mIsRouterRestoringChildren(false),
mPreviousPartitionId(0),
mRouterSelectionJitter(kRouterSelectionJitter),
mRouterSelectionJitterTimeout(0),
mParentPriority(kParentPriorityUnspecified)
{
mDeviceMode |= ModeTlv::kModeFFD | ModeTlv::kModeFullNetworkData;
memset(mChildren, 0, sizeof(mChildren));
memset(mRouters, 0, sizeof(mRouters));
SetRouterId(kInvalidRouterId);
}
bool MleRouter::IsRouterRoleEnabled(void) const
{
return mRouterRoleEnabled && (mDeviceMode & ModeTlv::kModeFFD);
}
void MleRouter::SetRouterRoleEnabled(bool aEnabled)
{
mRouterRoleEnabled = aEnabled;
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
case OT_DEVICE_ROLE_DETACHED:
break;
case OT_DEVICE_ROLE_CHILD:
GetNetif().GetMac().SetBeaconEnabled(mRouterRoleEnabled);
break;
case OT_DEVICE_ROLE_ROUTER:
case OT_DEVICE_ROLE_LEADER:
if (!mRouterRoleEnabled)
{
BecomeDetached();
}
break;
}
}
uint8_t MleRouter::AllocateRouterId(void)
{
uint8_t rval = kInvalidRouterId;
// count available router ids
uint8_t numAvailable = 0;
uint8_t numAllocated = 0;
for (int i = 0; i <= kMaxRouterId; i++)
{
if (mRouters[i].IsAllocated())
{
numAllocated++;
}
else if (mRouters[i].IsReclaimDelay() == false)
{
numAvailable++;
}
}
VerifyOrExit(numAllocated < kMaxRouters && numAvailable > 0, rval = kInvalidRouterId);
// choose available router id at random
uint8_t freeBit;
freeBit = otPlatRandomGet() % numAvailable;
// allocate router id
for (uint8_t i = 0; i <= kMaxRouterId; i++)
{
if (mRouters[i].IsAllocated() || mRouters[i].IsReclaimDelay())
{
continue;
}
if (freeBit == 0)
{
rval = AllocateRouterId(i);
ExitNow();
}
freeBit--;
}
exit:
return rval;
}
uint8_t MleRouter::AllocateRouterId(uint8_t aRouterId)
{
uint8_t rval = kInvalidRouterId;
Router *router;
router = GetRouter(aRouterId);
assert(router != NULL);
VerifyOrExit(!router->IsAllocated(), rval = kInvalidRouterId);
// init router state
router->SetAllocated(true);
router->SetLastHeard(Timer::GetNow());
router->ClearExtAddress();
// bump sequence number
mRouterIdSequence++;
mRouterIdSequenceLastUpdated = Timer::GetNow();
rval = aRouterId;
otLogInfoMle(GetInstance(), "add router id %d", aRouterId);
exit:
return rval;
}
otError MleRouter::ReleaseRouterId(uint8_t aRouterId)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
Router *router = GetRouter(aRouterId);
VerifyOrExit(router != NULL, error = OT_ERROR_INVALID_ARGS);
VerifyOrExit(mRole == OT_DEVICE_ROLE_LEADER, error = OT_ERROR_INVALID_STATE);
otLogInfoMle(GetInstance(), "delete router id %d", aRouterId);
router->SetAllocated(false);
router->SetReclaimDelay(true);
router->SetState(Neighbor::kStateInvalid);
router->SetNextHop(kInvalidRouterId);
for (uint8_t i = 0; i <= kMaxRouterId; i++)
{
if (mRouters[i].GetNextHop() == aRouterId)
{
mRouters[i].SetNextHop(kInvalidRouterId);
mRouters[i].SetCost(0);
}
}
mRouterIdSequence++;
mRouterIdSequenceLastUpdated = Timer::GetNow();
netif.GetAddressResolver().Remove(aRouterId);
netif.GetNetworkDataLeader().RemoveBorderRouter(GetRloc16(aRouterId));
ResetAdvertiseInterval();
exit:
return error;
}
uint32_t MleRouter::GetLeaderAge(void) const
{
return Timer::MsecToSec(Timer::GetNow() - mRouterIdSequenceLastUpdated);
}
otError MleRouter::BecomeRouter(ThreadStatusTlv::Status aStatus)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
VerifyOrExit(mRole != OT_DEVICE_ROLE_DISABLED, error = OT_ERROR_INVALID_STATE);
VerifyOrExit(mRole != OT_DEVICE_ROLE_ROUTER, error = OT_ERROR_NONE);
VerifyOrExit(IsRouterRoleEnabled(), error = OT_ERROR_NOT_CAPABLE);
for (int i = 0; i <= kMaxRouterId; i++)
{
mRouters[i].SetAllocated(false);
mRouters[i].SetReclaimDelay(false);
mRouters[i].SetState(Neighbor::kStateInvalid);
mRouters[i].SetNextHop(kInvalidRouterId);
}
mAdvertiseTimer.Stop();
netif.GetAddressResolver().Clear();
netif.GetMeshForwarder().SetRxOnWhenIdle(true);
mRouterSelectionJitterTimeout = 0;
switch (mRole)
{
case OT_DEVICE_ROLE_DETACHED:
SuccessOrExit(error = SendLinkRequest(NULL));
mStateUpdateTimer.Start(kStateUpdatePeriod);
break;
case OT_DEVICE_ROLE_CHILD:
SuccessOrExit(error = SendAddressSolicit(aStatus));
break;
default:
assert(false);
break;
}
exit:
return error;
}
otError MleRouter::BecomeLeader(void)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
uint8_t routerId;
Router *router;
VerifyOrExit(mRole != OT_DEVICE_ROLE_DISABLED, error = OT_ERROR_INVALID_STATE);
VerifyOrExit(mRole != OT_DEVICE_ROLE_LEADER, error = OT_ERROR_NONE);
VerifyOrExit(IsRouterRoleEnabled(), error = OT_ERROR_NOT_CAPABLE);
for (int i = 0; i <= kMaxRouterId; i++)
{
mRouters[i].SetAllocated(false);
mRouters[i].SetReclaimDelay(false);
mRouters[i].SetState(Neighbor::kStateInvalid);
mRouters[i].SetNextHop(kInvalidRouterId);
}
routerId = IsRouterIdValid(mPreviousRouterId) ? AllocateRouterId(mPreviousRouterId) : AllocateRouterId();
router = GetRouter(routerId);
VerifyOrExit(router != NULL, error = OT_ERROR_NO_BUFS);
SetRouterId(routerId);
router->SetExtAddress(*netif.GetMac().GetExtAddress());
mAdvertiseTimer.Stop();
netif.GetAddressResolver().Clear();
if (mFixedLeaderPartitionId != 0)
{
SetLeaderData(mFixedLeaderPartitionId, mLeaderWeight, mRouterId);
}
else
{
SetLeaderData(otPlatRandomGet(), mLeaderWeight, mRouterId);
}
mRouterIdSequence = static_cast<uint8_t>(otPlatRandomGet());
netif.GetNetworkDataLeader().Reset();
netif.GetLeader().SetEmptyCommissionerData();
SuccessOrExit(error = SetStateLeader(GetRloc16(mRouterId)));
exit:
return error;
}
void MleRouter::StopLeader(void)
{
ThreadNetif &netif = GetNetif();
netif.GetCoap().RemoveResource(mAddressSolicit);
netif.GetCoap().RemoveResource(mAddressRelease);
netif.GetActiveDataset().StopLeader();
netif.GetPendingDataset().StopLeader();
mAdvertiseTimer.Stop();
netif.GetNetworkDataLeader().Stop();
#if !OPENTHREAD_CONFIG_NEST_STAY_SUBSCRIBED_TO_ALL_ROUTERS_MULTICAST_ADDR
netif.UnsubscribeAllRoutersMulticast();
#endif
}
otError MleRouter::HandleDetachStart(void)
{
otError error = OT_ERROR_NONE;
GetNetif().GetAddressResolver().Clear();
for (int i = 0; i <= kMaxRouterId; i++)
{
mRouters[i].SetState(Neighbor::kStateInvalid);
}
StopLeader();
mStateUpdateTimer.Stop();
return error;
}
otError MleRouter::HandleChildStart(AttachMode aMode)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
mRouterIdSequenceLastUpdated = Timer::GetNow();
mRouterSelectionJitterTimeout = (otPlatRandomGet() % mRouterSelectionJitter) + 1;
StopLeader();
mStateUpdateTimer.Start(kStateUpdatePeriod);
if (mRouterRoleEnabled)
{
netif.GetMac().SetBeaconEnabled(true);
}
netif.SubscribeAllRoutersMulticast();
VerifyOrExit(IsRouterIdValid(mPreviousRouterId), error = OT_ERROR_INVALID_STATE);
switch (aMode)
{
case kAttachSame1:
case kAttachSame2:
// downgrade
if (GetActiveRouterCount() > mRouterDowngradeThreshold)
{
SendAddressRelease();
// reset children info if any
if (HasChildren())
{
RemoveChildren();
}
// reset routerId info
SetRouterId(kInvalidRouterId);
}
else if (HasChildren())
{
BecomeRouter(ThreadStatusTlv::kHaveChildIdRequest);
}
break;
case kAttachAny:
case kAttachBetter:
if (HasChildren() &&
mPreviousPartitionId != mLeaderData.GetPartitionId())
{
BecomeRouter(ThreadStatusTlv::kParentPartitionChange);
}
break;
}
exit:
if (GetActiveRouterCount() >= mRouterUpgradeThreshold &&
(!IsRouterIdValid(mPreviousRouterId) || !HasChildren()))
{
SetRouterId(kInvalidRouterId);
}
return error;
}
otError MleRouter::SetStateRouter(uint16_t aRloc16)
{
ThreadNetif &netif = GetNetif();
if (mRole != OT_DEVICE_ROLE_ROUTER)
{
netif.SetStateChangedFlags(OT_CHANGED_THREAD_ROLE);
}
SetRloc16(aRloc16);
mRole = OT_DEVICE_ROLE_ROUTER;
mParentRequestState = kParentIdle;
mParentRequestTimer.Stop();
ResetAdvertiseInterval();
netif.SubscribeAllRoutersMulticast();
mRouters[mRouterId].SetNextHop(mRouterId);
mPreviousPartitionId = mLeaderData.GetPartitionId();
netif.GetNetworkDataLeader().Stop();
mStateUpdateTimer.Start(kStateUpdatePeriod);
netif.GetIp6().SetForwardingEnabled(true);
netif.GetIp6().mMpl.SetTimerExpirations(kMplRouterDataMessageTimerExpirations);
netif.GetMac().SetBeaconEnabled(true);
for (int i = 0; i < mMaxChildrenAllowed; i++)
{
if (mChildren[i].GetState() == Neighbor::kStateRestored)
{
mIsRouterRestoringChildren = true;
break;
}
}
otLogInfoMle(GetInstance(), "Mode -> Router");
return OT_ERROR_NONE;
}
otError MleRouter::SetStateLeader(uint16_t aRloc16)
{
ThreadNetif &netif = GetNetif();
if (mRole != OT_DEVICE_ROLE_LEADER)
{
netif.SetStateChangedFlags(OT_CHANGED_THREAD_ROLE);
}
SetRloc16(aRloc16);
mRole = OT_DEVICE_ROLE_LEADER;
mParentRequestState = kParentIdle;
mParentRequestTimer.Stop();
ResetAdvertiseInterval();
AddLeaderAloc();
netif.SubscribeAllRoutersMulticast();
mRouters[mRouterId].SetNextHop(mRouterId);
mPreviousPartitionId = mLeaderData.GetPartitionId();
mStateUpdateTimer.Start(kStateUpdatePeriod);
mRouters[mRouterId].SetLastHeard(Timer::GetNow());
netif.GetNetworkDataLeader().Start();
netif.GetActiveDataset().StartLeader();
netif.GetPendingDataset().StartLeader();
netif.GetCoap().AddResource(mAddressSolicit);
netif.GetCoap().AddResource(mAddressRelease);
netif.GetIp6().SetForwardingEnabled(true);
netif.GetIp6().mMpl.SetTimerExpirations(kMplRouterDataMessageTimerExpirations);
netif.GetMac().SetBeaconEnabled(true);
for (int i = 0; i < mMaxChildrenAllowed; i++)
{
if (mChildren[i].GetState() == Neighbor::kStateRestored)
{
mIsRouterRestoringChildren = true;
break;
}
}
otLogInfoMle(GetInstance(), "Mode -> Leader %d", mLeaderData.GetPartitionId());
return OT_ERROR_NONE;
}
bool MleRouter::HandleAdvertiseTimer(TrickleTimer &aTimer)
{
return GetOwner(aTimer).HandleAdvertiseTimer();
}
bool MleRouter::HandleAdvertiseTimer(void)
{
if ((mDeviceMode & ModeTlv::kModeFFD) == 0)
{
return false;
}
SendAdvertisement();
return true;
}
void MleRouter::StopAdvertiseTimer(void)
{
mAdvertiseTimer.Stop();
}
void MleRouter::ResetAdvertiseInterval(void)
{
VerifyOrExit(mRole == OT_DEVICE_ROLE_ROUTER || mRole == OT_DEVICE_ROLE_LEADER);
if (!mAdvertiseTimer.IsRunning())
{
mAdvertiseTimer.Start(
Timer::SecToMsec(kAdvertiseIntervalMin),
Timer::SecToMsec(kAdvertiseIntervalMax),
TrickleTimer::kModeNormal);
}
mAdvertiseTimer.IndicateInconsistent();
exit:
return;
}
otError MleRouter::SendAdvertisement(void)
{
otError error = OT_ERROR_NONE;
Ip6::Address destination;
Message *message;
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
SuccessOrExit(error = AppendHeader(*message, Header::kCommandAdvertisement));
SuccessOrExit(error = AppendSourceAddress(*message));
SuccessOrExit(error = AppendLeaderData(*message));
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
case OT_DEVICE_ROLE_DETACHED:
assert(false);
break;
case OT_DEVICE_ROLE_CHILD:
break;
case OT_DEVICE_ROLE_ROUTER:
case OT_DEVICE_ROLE_LEADER:
SuccessOrExit(error = AppendRoute(*message));
break;
}
memset(&destination, 0, sizeof(destination));
destination.mFields.m16[0] = HostSwap16(0xff02);
destination.mFields.m16[7] = HostSwap16(0x0001);
SuccessOrExit(error = SendMessage(*message, destination));
otLogInfoMle(GetInstance(), "Sent advertisement");
exit:
if (error != OT_ERROR_NONE && message != NULL)
{
message->Free();
}
return error;
}
otError MleRouter::SendLinkRequest(Neighbor *aNeighbor)
{
static const uint8_t detachedTlvs[] = {Tlv::kAddress16, Tlv::kRoute};
static const uint8_t routerTlvs[] = {Tlv::kLinkMargin};
otError error = OT_ERROR_NONE;
Message *message;
Ip6::Address destination;
memset(&destination, 0, sizeof(destination));
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
SuccessOrExit(error = AppendHeader(*message, Header::kCommandLinkRequest));
SuccessOrExit(error = AppendVersion(*message));
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
assert(false);
break;
case OT_DEVICE_ROLE_DETACHED:
SuccessOrExit(error = AppendTlvRequest(*message, detachedTlvs, sizeof(detachedTlvs)));
break;
case OT_DEVICE_ROLE_CHILD:
SuccessOrExit(error = AppendSourceAddress(*message));
SuccessOrExit(error = AppendLeaderData(*message));
break;
case OT_DEVICE_ROLE_ROUTER:
case OT_DEVICE_ROLE_LEADER:
SuccessOrExit(error = AppendTlvRequest(*message, routerTlvs, sizeof(routerTlvs)));
SuccessOrExit(error = AppendSourceAddress(*message));
SuccessOrExit(error = AppendLeaderData(*message));
break;
}
if (aNeighbor == NULL)
{
for (uint8_t i = 0; i < sizeof(mChallenge); i++)
{
mChallenge[i] = static_cast<uint8_t>(otPlatRandomGet());
}
mChallengeTimeout = (((2 * kMaxResponseDelay) + kStateUpdatePeriod - 1) / kStateUpdatePeriod);
SuccessOrExit(error = AppendChallenge(*message, mChallenge, sizeof(mChallenge)));
destination.mFields.m8[0] = 0xff;
destination.mFields.m8[1] = 0x02;
destination.mFields.m8[15] = 2;
}
else
{
aNeighbor->GenerateChallenge();
SuccessOrExit(error = AppendChallenge(*message, aNeighbor->GetChallenge(), aNeighbor->GetChallengeSize()));
destination.mFields.m16[0] = HostSwap16(0xfe80);
destination.SetIid(aNeighbor->GetExtAddress());
}
SuccessOrExit(error = SendMessage(*message, destination));
otLogInfoMle(GetInstance(), "Sent link request");
exit:
if (error != OT_ERROR_NONE && message != NULL)
{
message->Free();
}
return error;
}
otError MleRouter::HandleLinkRequest(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
{
otError error = OT_ERROR_NONE;
Neighbor *neighbor = NULL;
Mac::ExtAddress macAddr;
ChallengeTlv challenge;
VersionTlv version;
LeaderDataTlv leaderData;
SourceAddressTlv sourceAddress;
TlvRequestTlv tlvRequest;
uint16_t rloc16;
otLogInfoMle(GetInstance(), "Received link request");
VerifyOrExit(mRole == OT_DEVICE_ROLE_ROUTER || mRole == OT_DEVICE_ROLE_LEADER, error = OT_ERROR_INVALID_STATE);
VerifyOrExit(mParentRequestState == kParentIdle, error = OT_ERROR_INVALID_STATE);
macAddr.Set(aMessageInfo.GetPeerAddr());
// Challenge
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kChallenge, sizeof(challenge), challenge));
VerifyOrExit(challenge.IsValid(), error = OT_ERROR_PARSE);
// Version
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kVersion, sizeof(version), version));
VerifyOrExit(version.IsValid() && version.GetVersion() >= kVersion, error = OT_ERROR_PARSE);
// Leader Data
if (Tlv::GetTlv(aMessage, Tlv::kLeaderData, sizeof(leaderData), leaderData) == OT_ERROR_NONE)
{
VerifyOrExit(leaderData.IsValid(), error = OT_ERROR_PARSE);
VerifyOrExit(leaderData.GetPartitionId() == mLeaderData.GetPartitionId(), error = OT_ERROR_INVALID_STATE);
}
// Source Address
if (Tlv::GetTlv(aMessage, Tlv::kSourceAddress, sizeof(sourceAddress), sourceAddress) == OT_ERROR_NONE)
{
VerifyOrExit(sourceAddress.IsValid(), error = OT_ERROR_PARSE);
rloc16 = sourceAddress.GetRloc16();
if ((neighbor = GetNeighbor(macAddr)) != NULL && neighbor->GetRloc16() != rloc16)
{
// remove stale neighbors
RemoveNeighbor(*neighbor);
neighbor = NULL;
}
if (IsActiveRouter(rloc16))
{
// source is a router
neighbor = GetRouter(GetRouterId(rloc16));
VerifyOrExit(neighbor != NULL, error = OT_ERROR_PARSE);
if (neighbor->GetState() != Neighbor::kStateValid)
{
const ThreadMessageInfo *threadMessageInfo =
static_cast<const ThreadMessageInfo *>(aMessageInfo.GetLinkInfo());
neighbor->SetExtAddress(macAddr);
neighbor->GetLinkInfo().Clear();
neighbor->GetLinkInfo().AddRss(GetNetif().GetMac().GetNoiseFloor(), threadMessageInfo->mRss);
neighbor->ResetLinkFailures();
neighbor->SetState(Neighbor::kStateLinkRequest);
}
else
{
VerifyOrExit(memcmp(&neighbor->GetExtAddress(), &macAddr, sizeof(macAddr)) == 0);
}
}
else
{
// source is not a router
neighbor = NULL;
}
}
else
{
// lack of source address indicates router coming out of reset
VerifyOrExit((neighbor = GetNeighbor(macAddr)) != NULL &&
neighbor->GetState() == Neighbor::kStateValid &&
IsActiveRouter(neighbor->GetRloc16()),
error = OT_ERROR_DROP);
}
// TLV Request
if (Tlv::GetTlv(aMessage, Tlv::kTlvRequest, sizeof(tlvRequest), tlvRequest) == OT_ERROR_NONE)
{
VerifyOrExit(tlvRequest.IsValid(), error = OT_ERROR_PARSE);
}
else
{
tlvRequest.SetLength(0);
}
SuccessOrExit(error = SendLinkAccept(aMessageInfo, neighbor, tlvRequest, challenge));
exit:
return error;
}
otError MleRouter::SendLinkAccept(const Ip6::MessageInfo &aMessageInfo, Neighbor *aNeighbor,
const TlvRequestTlv &aTlvRequest, const ChallengeTlv &aChallenge)
{
otError error = OT_ERROR_NONE;
const ThreadMessageInfo *threadMessageInfo = static_cast<const ThreadMessageInfo *>(aMessageInfo.GetLinkInfo());
static const uint8_t routerTlvs[] = {Tlv::kLinkMargin};
Message *message;
Header::Command command;
uint8_t linkMargin;
command = (aNeighbor == NULL || aNeighbor->GetState() == Neighbor::kStateValid) ?
Header::kCommandLinkAccept : Header::kCommandLinkAcceptAndRequest;
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
SuccessOrExit(error = AppendHeader(*message, command));
SuccessOrExit(error = AppendVersion(*message));
SuccessOrExit(error = AppendSourceAddress(*message));
SuccessOrExit(error = AppendResponse(*message, aChallenge.GetChallenge(), aChallenge.GetLength()));
SuccessOrExit(error = AppendLinkFrameCounter(*message));
SuccessOrExit(error = AppendMleFrameCounter(*message));
// always append a link margin, regardless of whether or not it was requested
linkMargin = LinkQualityInfo::ConvertRssToLinkMargin(GetNetif().GetMac().GetNoiseFloor(), threadMessageInfo->mRss);
// add for certification testing
if (isAssignLinkQuality && aNeighbor != NULL &&
(memcmp(&aNeighbor->GetExtAddress(), mAddr64.m8, OT_EXT_ADDRESS_SIZE) == 0))
{
linkMargin = mAssignLinkMargin;
}
SuccessOrExit(error = AppendLinkMargin(*message, linkMargin));
if (aNeighbor != NULL && IsActiveRouter(aNeighbor->GetRloc16()))
{
SuccessOrExit(error = AppendLeaderData(*message));
}
for (uint8_t i = 0; i < aTlvRequest.GetLength(); i++)
{
switch (aTlvRequest.GetTlvs()[i])
{
case Tlv::kRoute:
SuccessOrExit(error = AppendRoute(*message));
break;
case Tlv::kAddress16:
VerifyOrExit(aNeighbor != NULL, error = OT_ERROR_DROP);
SuccessOrExit(error = AppendAddress16(*message, aNeighbor->GetRloc16()));
break;
case Tlv::kLinkMargin:
break;
default:
ExitNow(error = OT_ERROR_DROP);
}
}
if (aNeighbor != NULL && aNeighbor->GetState() != Neighbor::kStateValid)
{
aNeighbor->GenerateChallenge();
SuccessOrExit(error = AppendChallenge(*message, aNeighbor->GetChallenge(), aNeighbor->GetChallengeSize()));
SuccessOrExit(error = AppendTlvRequest(*message, routerTlvs, sizeof(routerTlvs)));
aNeighbor->SetState(Neighbor::kStateLinkRequest);
}
if (aMessageInfo.GetSockAddr().IsMulticast())
{
SuccessOrExit(error = AddDelayedResponse(*message, aMessageInfo.GetPeerAddr(),
(otPlatRandomGet() % kMaxResponseDelay) + 1));
otLogInfoMle(GetInstance(), "Delayed link accept");
}
else
{
SuccessOrExit(error = SendMessage(*message, aMessageInfo.GetPeerAddr()));
otLogInfoMle(GetInstance(), "Sent link accept");
}
exit:
if (error != OT_ERROR_NONE && message != NULL)
{
message->Free();
}
return error;
}
otError MleRouter::HandleLinkAccept(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo,
uint32_t aKeySequence)
{
otLogInfoMle(GetInstance(), "Received link accept");
return HandleLinkAccept(aMessage, aMessageInfo, aKeySequence, false);
}
otError MleRouter::HandleLinkAcceptAndRequest(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo,
uint32_t aKeySequence)
{
otLogInfoMle(GetInstance(), "Received link accept and request");
return HandleLinkAccept(aMessage, aMessageInfo, aKeySequence, true);
}
otError MleRouter::HandleLinkAccept(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo,
uint32_t aKeySequence, bool aRequest)
{
otError error = OT_ERROR_NONE;
const ThreadMessageInfo *threadMessageInfo = static_cast<const ThreadMessageInfo *>(aMessageInfo.GetLinkInfo());
Router *router;
Neighbor *neighbor;
Mac::ExtAddress macAddr;
VersionTlv version;
ResponseTlv response;
SourceAddressTlv sourceAddress;
LinkFrameCounterTlv linkFrameCounter;
MleFrameCounterTlv mleFrameCounter;
uint8_t routerId;
Address16Tlv address16;
RouteTlv route;
LeaderDataTlv leaderData;
LinkMarginTlv linkMargin;
ChallengeTlv challenge;
TlvRequestTlv tlvRequest;
macAddr.Set(aMessageInfo.GetPeerAddr());
// Version
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kVersion, sizeof(version), version));
VerifyOrExit(version.IsValid(), error = OT_ERROR_PARSE);
// Response
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kResponse, sizeof(response), response));
VerifyOrExit(response.IsValid(), error = OT_ERROR_PARSE);
// Source Address
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kSourceAddress, sizeof(sourceAddress), sourceAddress));
VerifyOrExit(sourceAddress.IsValid(), error = OT_ERROR_PARSE);
// Remove stale neighbors
if ((neighbor = GetNeighbor(macAddr)) != NULL &&
neighbor->GetRloc16() != sourceAddress.GetRloc16())
{
RemoveNeighbor(*neighbor);
}
// Link-Layer Frame Counter
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kLinkFrameCounter, sizeof(linkFrameCounter),
linkFrameCounter));
VerifyOrExit(linkFrameCounter.IsValid(), error = OT_ERROR_PARSE);
// MLE Frame Counter
if (Tlv::GetTlv(aMessage, Tlv::kMleFrameCounter, sizeof(mleFrameCounter), mleFrameCounter) ==
OT_ERROR_NONE)
{
VerifyOrExit(mleFrameCounter.IsValid(), error = OT_ERROR_PARSE);
}
else
{
mleFrameCounter.SetFrameCounter(linkFrameCounter.GetFrameCounter());
}
VerifyOrExit(IsActiveRouter(sourceAddress.GetRloc16()), error = OT_ERROR_PARSE);
routerId = GetRouterId(sourceAddress.GetRloc16());
router = GetRouter(routerId);
VerifyOrExit(router != NULL, error = OT_ERROR_PARSE);
// verify response
switch (router->GetState())
{
case Neighbor::kStateLinkRequest:
VerifyOrExit(memcmp(router->GetChallenge(), response.GetResponse(), router->GetChallengeSize()) == 0,
error = OT_ERROR_SECURITY);
break;
case Neighbor::kStateInvalid:
case Neighbor::kStateValid:
VerifyOrExit((mChallengeTimeout > 0) && (memcmp(mChallenge, response.GetResponse(), sizeof(mChallenge)) == 0),
error = OT_ERROR_SECURITY);
break;
default:
ExitNow(error = OT_ERROR_INVALID_STATE);
}
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
assert(false);
break;
case OT_DEVICE_ROLE_DETACHED:
// Address16
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kAddress16, sizeof(address16), address16));
VerifyOrExit(address16.IsValid(), error = OT_ERROR_PARSE);
VerifyOrExit(GetRloc16() == address16.GetRloc16(), error = OT_ERROR_DROP);
// Route
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kRoute, sizeof(route), route));
VerifyOrExit(route.IsValid(), error = OT_ERROR_PARSE);
SuccessOrExit(error = ProcessRouteTlv(route));
// Leader Data
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kLeaderData, sizeof(leaderData), leaderData));
VerifyOrExit(leaderData.IsValid(), error = OT_ERROR_PARSE);
SetLeaderData(leaderData.GetPartitionId(), leaderData.GetWeighting(), leaderData.GetLeaderRouterId());
if (mLeaderData.GetLeaderRouterId() == GetRouterId(GetRloc16()))
{
SetStateLeader(GetRloc16());
}
else
{
static const uint8_t tlvs[] = {Tlv::kNetworkData};
SetStateRouter(GetRloc16());
mRetrieveNewNetworkData = true;
SendDataRequest(aMessageInfo.GetPeerAddr(), tlvs, sizeof(tlvs), 0);
}
break;
case OT_DEVICE_ROLE_CHILD:
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kLinkMargin, sizeof(linkMargin), linkMargin));
VerifyOrExit(linkMargin.IsValid(), error = OT_ERROR_PARSE);
router->SetLinkQualityOut(LinkQualityInfo::ConvertLinkMarginToLinkQuality(linkMargin.GetLinkMargin()));
break;
case OT_DEVICE_ROLE_ROUTER:
case OT_DEVICE_ROLE_LEADER:
// Leader Data
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kLeaderData, sizeof(leaderData), leaderData));
VerifyOrExit(leaderData.IsValid(), error = OT_ERROR_PARSE);
VerifyOrExit(leaderData.GetPartitionId() == mLeaderData.GetPartitionId());
// Link Margin
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kLinkMargin, sizeof(linkMargin), linkMargin));
VerifyOrExit(linkMargin.IsValid(), error = OT_ERROR_PARSE);
router->SetLinkQualityOut(LinkQualityInfo::ConvertLinkMarginToLinkQuality(linkMargin.GetLinkMargin()));
// update routing table
if (routerId != mRouterId && !IsRouterIdValid(router->GetNextHop()))
{
ResetAdvertiseInterval();
}
break;
}
// finish link synchronization
router->SetExtAddress(macAddr);
router->SetRloc16(sourceAddress.GetRloc16());
router->SetLinkFrameCounter(linkFrameCounter.GetFrameCounter());
router->SetMleFrameCounter(mleFrameCounter.GetFrameCounter());
router->SetLastHeard(Timer::GetNow());
router->SetDeviceMode(ModeTlv::kModeFFD | ModeTlv::kModeRxOnWhenIdle | ModeTlv::kModeFullNetworkData);
router->GetLinkInfo().Clear();
router->GetLinkInfo().AddRss(GetNetif().GetMac().GetNoiseFloor(), threadMessageInfo->mRss);
router->ResetLinkFailures();
router->SetState(Neighbor::kStateValid);
router->SetKeySequence(aKeySequence);
if (aRequest)
{
// Challenge
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kChallenge, sizeof(challenge), challenge));
VerifyOrExit(challenge.IsValid(), error = OT_ERROR_PARSE);
// TLV Request
if (Tlv::GetTlv(aMessage, Tlv::kTlvRequest, sizeof(tlvRequest), tlvRequest) == OT_ERROR_NONE)
{
VerifyOrExit(tlvRequest.IsValid(), error = OT_ERROR_PARSE);
}
else
{
tlvRequest.SetLength(0);
}
SuccessOrExit(error = SendLinkAccept(aMessageInfo, router, tlvRequest, challenge));
}
exit:
return error;
}
Child *MleRouter::NewChild(void)
{
for (int i = 0; i < mMaxChildrenAllowed; i++)
{
if (mChildren[i].GetState() == Neighbor::kStateInvalid)
{
return &mChildren[i];
}
}
return NULL;
}
Child *MleRouter::FindChild(uint16_t aChildId)
{
Child *rval = NULL;
for (int i = 0; i < mMaxChildrenAllowed; i++)
{
if (mChildren[i].GetState() != Neighbor::kStateInvalid &&
GetChildId(mChildren[i].GetRloc16()) == aChildId)
{
ExitNow(rval = &mChildren[i]);
}
}
exit:
return rval;
}
Child *MleRouter::FindChild(const Mac::ExtAddress &aAddress)
{
Child *rval = NULL;
for (int i = 0; i < mMaxChildrenAllowed; i++)
{
if (mChildren[i].GetState() != Neighbor::kStateInvalid &&
memcmp(&mChildren[i].GetExtAddress(), &aAddress, sizeof(mChildren[i].GetExtAddress())) == 0)
{
ExitNow(rval = &mChildren[i]);
}
}
exit:
return rval;
}
uint8_t MleRouter::LinkQualityToCost(uint8_t aLinkQuality)
{
switch (aLinkQuality)
{
case 1:
return kLinkQuality1LinkCost;
case 2:
return kLinkQuality2LinkCost;
case 3:
return kLinkQuality3LinkCost;
default:
return kLinkQuality0LinkCost;
}
}
uint8_t MleRouter::GetLinkCost(uint8_t aRouterId)
{
uint8_t rval = kMaxRouteCost;
Router *router;
router = GetRouter(aRouterId);
// NULL aRouterId indicates non-existing next hop, hence return kMaxRouteCost for it.
VerifyOrExit(aRouterId != mRouterId && router != NULL && router->GetState() == Neighbor::kStateValid);
rval = router->GetLinkInfo().GetLinkQuality(GetNetif().GetMac().GetNoiseFloor());
if (rval > router->GetLinkQualityOut())
{
rval = router->GetLinkQualityOut();
}
// add for certification testing
if (isAssignLinkQuality && (memcmp(&router->GetExtAddress(), mAddr64.m8, OT_EXT_ADDRESS_SIZE) == 0))
{
rval = mAssignLinkQuality;
}
rval = LinkQualityToCost(rval);
exit:
return rval;
}
otError MleRouter::SetRouterSelectionJitter(uint8_t aRouterJitter)
{
otError error = OT_ERROR_NONE;
VerifyOrExit(aRouterJitter > 0, error = OT_ERROR_INVALID_ARGS);
mRouterSelectionJitter = aRouterJitter;
exit:
return error;
}
otError MleRouter::ProcessRouteTlv(const RouteTlv &aRoute)
{
otError error = OT_ERROR_NONE;
mRouterIdSequence = aRoute.GetRouterIdSequence();
mRouterIdSequenceLastUpdated = Timer::GetNow();
for (uint8_t i = 0; i <= kMaxRouterId; i++)
{
bool old = mRouters[i].IsAllocated();
mRouters[i].SetAllocated(aRoute.IsRouterIdSet(i));
if (old && !mRouters[i].IsAllocated())
{
mRouters[i].SetNextHop(kInvalidRouterId);
GetNetif().GetAddressResolver().Remove(i);
}
}
if (mRole == OT_DEVICE_ROLE_ROUTER && !mRouters[mRouterId].IsAllocated())
{
BecomeDetached();
ExitNow(error = OT_ERROR_NO_ROUTE);
}
exit:
return error;
}
bool MleRouter::IsSingleton(void)
{
bool rval = true;
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
case OT_DEVICE_ROLE_DETACHED:
ExitNow(rval = true);
break;
case OT_DEVICE_ROLE_CHILD:
ExitNow(rval = ((mDeviceMode & ModeTlv::kModeFFD) == 0));
break;
case OT_DEVICE_ROLE_ROUTER:
ExitNow(rval = false);
break;
case OT_DEVICE_ROLE_LEADER:
// not a singleton if any other routers exist
for (int i = 0; i <= kMaxRouterId; i++)
{
if (i != mRouterId && mRouters[i].IsAllocated())
{
ExitNow(rval = false);
}
}
// not a singleton if any children are REEDs
for (int i = 0; i < mMaxChildrenAllowed; i++)
{
if (mChildren[i].GetState() == Neighbor::kStateValid && mChildren[i].IsFullThreadDevice())
{
ExitNow(rval = false);
}
}
break;
}
exit:
return rval;
}
int MleRouter::ComparePartitions(bool aSingletonA, const LeaderDataTlv &aLeaderDataA,
bool aSingletonB, const LeaderDataTlv &aLeaderDataB)
{
int rval = 0;
if (aSingletonA != aSingletonB)
{
ExitNow(rval = aSingletonB ? 1 : -1);
}
if (aLeaderDataA.GetWeighting() != aLeaderDataB.GetWeighting())
{
ExitNow(rval = aLeaderDataA.GetWeighting() > aLeaderDataB.GetWeighting() ? 1 : -1);
}
if (aLeaderDataA.GetPartitionId() != aLeaderDataB.GetPartitionId())
{
ExitNow(rval = aLeaderDataA.GetPartitionId() > aLeaderDataB.GetPartitionId() ? 1 : -1);
}
exit:
return rval;
}
uint8_t MleRouter::GetActiveRouterCount(void) const
{
uint8_t rval = 0;
for (int i = 0; i <= kMaxRouterId; i++)
{
if (mRouters[i].IsAllocated())
{
rval++;
}
}
return rval;
}
otError MleRouter::HandleAdvertisement(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
const ThreadMessageInfo *threadMessageInfo = static_cast<const ThreadMessageInfo *>(aMessageInfo.GetLinkInfo());
Mac::ExtAddress macAddr;
SourceAddressTlv sourceAddress;
LeaderDataTlv leaderData;
RouteTlv route;
uint32_t partitionId;
Router *router;
Neighbor *neighbor;
uint8_t routerId;
uint8_t routerCount;
macAddr.Set(aMessageInfo.GetPeerAddr());
// Source Address
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kSourceAddress, sizeof(sourceAddress), sourceAddress));
VerifyOrExit(sourceAddress.IsValid(), error = OT_ERROR_PARSE);
// Remove stale neighbors
if ((neighbor = GetNeighbor(macAddr)) != NULL &&
neighbor->GetRloc16() != sourceAddress.GetRloc16())
{
RemoveNeighbor(*neighbor);
}
// Leader Data
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kLeaderData, sizeof(leaderData), leaderData));
VerifyOrExit(leaderData.IsValid(), error = OT_ERROR_PARSE);
// Route Data
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kRoute, sizeof(route), route));
VerifyOrExit(route.IsValid(), error = OT_ERROR_PARSE);
partitionId = leaderData.GetPartitionId();
if (partitionId != mLeaderData.GetPartitionId())
{
otLogDebgMle(GetInstance(), "different partition! %d %d %d %d",
leaderData.GetWeighting(), partitionId,
mLeaderData.GetWeighting(), mLeaderData.GetPartitionId());
if (partitionId == mLastPartitionId && (mDeviceMode & ModeTlv::kModeFFD))
{
VerifyOrExit((static_cast<int8_t>(route.GetRouterIdSequence() - mLastPartitionRouterIdSequence) > 0),
error = OT_ERROR_DROP);
}
if (mRole == OT_DEVICE_ROLE_CHILD &&
(memcmp(&mParent.GetExtAddress(), &macAddr, sizeof(macAddr)) == 0 || !(mDeviceMode & ModeTlv::kModeFFD)))
{
ExitNow();
}
routerCount = 0;
for (uint8_t i = 0; i <= kMaxRouterId; i++)
{
if (route.IsRouterIdSet(i))
{
routerCount++;
}
}
if (ComparePartitions(routerCount <= 1, leaderData, IsSingleton(), mLeaderData) > 0)
{
otLogDebgMle(GetInstance(), "trying to migrate");
BecomeChild(kAttachBetter);
}
ExitNow(error = OT_ERROR_DROP);
}
else if (leaderData.GetLeaderRouterId() != GetLeaderId())
{
if (mRole != OT_DEVICE_ROLE_CHILD)
{
BecomeDetached();
error = OT_ERROR_DROP;
}
ExitNow();
}
VerifyOrExit(IsActiveRouter(sourceAddress.GetRloc16()));
routerId = GetRouterId(sourceAddress.GetRloc16());
router = GetRouter(routerId);
VerifyOrExit(router != NULL, error = OT_ERROR_PARSE);
if ((mDeviceMode & ModeTlv::kModeFFD) &&
static_cast<int8_t>(route.GetRouterIdSequence() - mRouterIdSequence) > 0)
{
bool processRouteTlv = false;
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
case OT_DEVICE_ROLE_DETACHED:
break;
case OT_DEVICE_ROLE_CHILD:
if ((sourceAddress.GetRloc16() == mParent.GetRloc16()) ||
(router->GetState() == Neighbor::kStateValid))
{
processRouteTlv = true;
}
break;
case OT_DEVICE_ROLE_ROUTER:
case OT_DEVICE_ROLE_LEADER:
processRouteTlv = true;
break;
}
if (processRouteTlv)
{
SuccessOrExit(error = ProcessRouteTlv(route));
}
}
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
case OT_DEVICE_ROLE_DETACHED:
ExitNow();
case OT_DEVICE_ROLE_CHILD:
if ((sourceAddress.GetRloc16() == mParent.GetRloc16() || router->GetState() == Neighbor::kStateValid) &&
(mDeviceMode & ModeTlv::kModeFFD) &&
(mRouterSelectionJitterTimeout == 0) &&
(GetActiveRouterCount() < mRouterUpgradeThreshold))
{
mRouterSelectionJitterTimeout = (otPlatRandomGet() % mRouterSelectionJitter) + 1;
ExitNow();
}
if (memcmp(&mParent.GetExtAddress(), &macAddr, sizeof(mParent.GetExtAddress())) == 0)
{
router = &mParent;
if (mParent.GetRloc16() != sourceAddress.GetRloc16())
{
BecomeDetached();
ExitNow(error = OT_ERROR_NO_ROUTE);
}
if (mDeviceMode & ModeTlv::kModeFFD)
{
for (uint8_t i = 0, routeCount = 0; i <= kMaxRouterId; i++)
{
if (route.IsRouterIdSet(i) == false)
{
continue;
}
if (i != GetLeaderId())
{
routeCount++;
continue;
}
if (route.GetRouteCost(routeCount) > 0)
{
mRouters[GetLeaderId()].SetNextHop(routerId);
mRouters[GetLeaderId()].SetCost(route.GetRouteCost(routeCount));
}
else
{
mRouters[GetLeaderId()].SetNextHop(kInvalidRouterId);
mRouters[GetLeaderId()].SetCost(0);
}
break;
}
}
}
else if ((mDeviceMode & ModeTlv::kModeFFD) && (router->GetState() != Neighbor::kStateValid))
{
router->SetExtAddress(macAddr);
router->GetLinkInfo().Clear();
router->GetLinkInfo().AddRss(netif.GetMac().GetNoiseFloor(), threadMessageInfo->mRss);
router->ResetLinkFailures();
router->SetState(Neighbor::kStateLinkRequest);
SendLinkRequest(router);
ExitNow(error = OT_ERROR_NO_ROUTE);
}
router->SetLastHeard(Timer::GetNow());
ExitNow();
case OT_DEVICE_ROLE_ROUTER:
// check current active router number
routerCount = 0;
for (uint8_t i = 0; i <= kMaxRouterId; i++)
{
if (route.IsRouterIdSet(i))
{
routerCount++;
}
}
if (routerCount > mRouterDowngradeThreshold &&
mRouterSelectionJitterTimeout == 0 &&
HasMinDowngradeNeighborRouters() &&
HasSmallNumberOfChildren() &&
HasOneNeighborwithComparableConnectivity(route, routerId))
{
mRouterSelectionJitterTimeout = (otPlatRandomGet() % mRouterSelectionJitter) + 1;
}
// fall through
case OT_DEVICE_ROLE_LEADER:
// router is not in list, reject
if (!router->IsAllocated())
{
ExitNow(error = OT_ERROR_NO_ROUTE);
}
// Send link request if no link to router
if (router->GetState() != Neighbor::kStateValid)
{
router->SetExtAddress(macAddr);
router->GetLinkInfo().Clear();
router->GetLinkInfo().AddRss(netif.GetMac().GetNoiseFloor(), threadMessageInfo->mRss);
router->ResetLinkFailures();
router->SetState(Neighbor::kStateLinkRequest);
router->SetDataRequestPending(false);
SendLinkRequest(router);
ExitNow(error = OT_ERROR_NO_ROUTE);
}
router->SetLastHeard(Timer::GetNow());
break;
}
UpdateRoutes(route, routerId);
#if OPENTHREAD_ENABLE_BORDER_ROUTER
netif.GetNetworkDataLocal().SendServerDataNotification();
#endif
exit:
return error;
}
void MleRouter::UpdateRoutes(const RouteTlv &aRoute, uint8_t aRouterId)
{
uint8_t curCost;
uint8_t newCost;
uint8_t oldNextHop;
uint8_t cost;
uint8_t linkQuality;
bool update;
// update routes
do
{
update = false;
for (uint8_t i = 0, routeCount = 0; i <= kMaxRouterId; i++)
{
if (aRoute.IsRouterIdSet(i) == false)
{
continue;
}
if (mRouters[i].IsAllocated() == false)
{
routeCount++;
continue;
}
if (i == mRouterId)
{
linkQuality = aRoute.GetLinkQualityIn(routeCount);
if (mRouters[aRouterId].GetLinkQualityOut() != linkQuality)
{
mRouters[aRouterId].SetLinkQualityOut(linkQuality);
update = true;
}
}
else
{
oldNextHop = mRouters[i].GetNextHop();
if (i == aRouterId)
{
cost = 0;
}
else
{
cost = aRoute.GetRouteCost(routeCount);
if (cost == 0)
{
cost = kMaxRouteCost;
}
}
if (!IsRouterIdValid(mRouters[i].GetNextHop()) || mRouters[i].GetNextHop() == aRouterId)
{
// route has no nexthop or nexthop is neighbor (sender)
if (i != aRouterId)
{
if (cost + GetLinkCost(aRouterId) <= kMaxRouteCost)
{
if (!IsRouterIdValid(mRouters[i].GetNextHop()) && GetLinkCost(i) >= kMaxRouteCost)
{
ResetAdvertiseInterval();
}
mRouters[i].SetNextHop(aRouterId);
mRouters[i].SetCost(cost);
}
else if (mRouters[i].GetNextHop() == aRouterId)
{
if (GetLinkCost(i) >= kMaxRouteCost)
{
ResetAdvertiseInterval();
}
mRouters[i].SetNextHop(kInvalidRouterId);
mRouters[i].SetCost(0);
mRouters[i].SetLastHeard(Timer::GetNow());
}
}
}
else
{
curCost = mRouters[i].GetCost() + GetLinkCost(mRouters[i].GetNextHop());
newCost = cost + GetLinkCost(aRouterId);
if (newCost < curCost && i != aRouterId)
{
mRouters[i].SetNextHop(aRouterId);
mRouters[i].SetCost(cost);
}
}
update |= mRouters[i].GetNextHop() != oldNextHop;
}
routeCount++;
}
}
while (update);
#if 1
for (uint8_t i = 0; i <= kMaxRouterId; i++)
{
if (mRouters[i].IsAllocated() == false || !IsRouterIdValid(mRouters[i].GetNextHop()))
{
continue;
}
otLogDebgMle(GetInstance(),
"%x: %x %d %d %d %d",
GetRloc16(i),
GetRloc16(mRouters[i].GetNextHop()),
mRouters[i].GetCost(),
GetLinkCost(i), mRouters[i].GetLinkInfo().GetLinkQuality(GetNetif().GetMac().GetNoiseFloor()),
mRouters[i].GetLinkQualityOut());
}
#endif
}
otError MleRouter::HandleParentRequest(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
{
otError error = OT_ERROR_NONE;
const ThreadMessageInfo *threadMessageInfo = static_cast<const ThreadMessageInfo *>(aMessageInfo.GetLinkInfo());
Mac::ExtAddress macAddr;
VersionTlv version;
ScanMaskTlv scanMask;
ChallengeTlv challenge;
Child *child;
otLogInfoMle(GetInstance(), "Received parent request");
// A Router MUST NOT send an MLE Parent Response if:
// 1. It has no available Child capacity (if Max Child Count minus
// Child Count would be equal to zero)
// ==> verified below when allocating a child entry
// 2. It is disconnected from its Partition (that is, it has not
// received an updated ID sequence number within LEADER_TIMEOUT
// seconds
VerifyOrExit(GetLeaderAge() < mNetworkIdTimeout, error = OT_ERROR_DROP);
// 3. Its current routing path cost to the Leader is infinite.
VerifyOrExit(mRole == OT_DEVICE_ROLE_LEADER ||
GetLinkCost(GetLeaderId()) < kMaxRouteCost ||
(mRole == OT_DEVICE_ROLE_CHILD && mRouters[GetLeaderId()].GetCost() + 1 < kMaxRouteCost) ||
(mRouters[GetLeaderId()].GetCost() + GetLinkCost(mRouters[GetLeaderId()].GetNextHop()) < kMaxRouteCost),
error = OT_ERROR_DROP);
macAddr.Set(aMessageInfo.GetPeerAddr());
// Version
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kVersion, sizeof(version), version));
VerifyOrExit(version.IsValid() && version.GetVersion() >= kVersion, error = OT_ERROR_PARSE);
// Scan Mask
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kScanMask, sizeof(scanMask), scanMask));
VerifyOrExit(scanMask.IsValid(), error = OT_ERROR_PARSE);
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
case OT_DEVICE_ROLE_DETACHED:
ExitNow();
case OT_DEVICE_ROLE_CHILD:
VerifyOrExit(scanMask.IsEndDeviceFlagSet());
break;
case OT_DEVICE_ROLE_ROUTER:
case OT_DEVICE_ROLE_LEADER:
VerifyOrExit(scanMask.IsRouterFlagSet());
break;
}
// Challenge
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kChallenge, sizeof(challenge), challenge));
VerifyOrExit(challenge.IsValid(), error = OT_ERROR_PARSE);
child = FindChild(macAddr);
if (child != NULL && !child->IsFullThreadDevice())
{
// Parent Request from a MTD child means that the child had detached. It can be safely removed.
RemoveNeighbor(*child);
child = NULL;
}
if (child == NULL)
{
VerifyOrExit((child = NewChild()) != NULL);
memset(child, 0, sizeof(*child));
// MAC Address
child->SetExtAddress(macAddr);
child->GetLinkInfo().Clear();
child->GetLinkInfo().AddRss(GetNetif().GetMac().GetNoiseFloor(), threadMessageInfo->mRss);
child->ResetLinkFailures();
child->SetState(Neighbor::kStateParentRequest);
child->SetDataRequestPending(false);
child->SetLastHeard(Timer::GetNow());
child->SetTimeout(Timer::MsecToSec(kMaxChildIdRequestTimeout));
}
SuccessOrExit(error = SendParentResponse(child, challenge, !scanMask.IsEndDeviceFlagSet()));
exit:
return error;
}
void MleRouter::HandleStateUpdateTimer(Timer &aTimer)
{
GetOwner(aTimer).HandleStateUpdateTimer();
}
void MleRouter::HandleStateUpdateTimer(void)
{
bool routerStateUpdate = false;
if (mChallengeTimeout > 0)
{
mChallengeTimeout--;
}
if (mRouterSelectionJitterTimeout > 0)
{
mRouterSelectionJitterTimeout--;
if (mRouterSelectionJitterTimeout == 0)
{
routerStateUpdate = true;
}
}
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
assert(false);
break;
case OT_DEVICE_ROLE_DETACHED:
BecomeDetached();
ExitNow();
case OT_DEVICE_ROLE_CHILD:
if (routerStateUpdate)
{
if (GetActiveRouterCount() < mRouterUpgradeThreshold)
{
// upgrade to Router
BecomeRouter(ThreadStatusTlv::kTooFewRouters);
}
else if (!mAdvertiseTimer.IsRunning())
{
SendAdvertisement();
mAdvertiseTimer.Start(
Timer::SecToMsec(kReedAdvertiseInterval),
Timer::SecToMsec(kReedAdvertiseInterval + kReedAdvertiseJitter),
TrickleTimer::kModePlainTimer);
}
ExitNow();
}
// fall through
case OT_DEVICE_ROLE_ROUTER:
// verify path to leader
otLogDebgMle(GetInstance(), "network id timeout = %d", GetLeaderAge());
if (GetLeaderAge() >= mNetworkIdTimeout)
{
BecomeChild(kAttachSame1);
}
if (routerStateUpdate && GetActiveRouterCount() > mRouterDowngradeThreshold)
{
// downgrade to REED
BecomeChild(kAttachSame1);
}
break;
case OT_DEVICE_ROLE_LEADER:
// update router id sequence
if (GetLeaderAge() >= kRouterIdSequencePeriod)
{
mRouterIdSequence++;
mRouterIdSequenceLastUpdated = Timer::GetNow();
}
break;
}
if (mIsRouterRestoringChildren)
{
bool hasRestoringChildren = false;
for (uint8_t i = 0; i < mMaxChildrenAllowed; i++)
{
if (mChildren[i].GetState() == Neighbor::kStateRestored)
{
SendChildUpdateRequest(&mChildren[i]);
hasRestoringChildren = true;
}
}
// no child to restore
if (!hasRestoringChildren)
{
mIsRouterRestoringChildren = false;
}
}
// update children state
for (int i = 0; i < mMaxChildrenAllowed; i++)
{
uint32_t timeout = 0;
switch (mChildren[i].GetState())
{
case Neighbor::kStateInvalid:
case Neighbor::kStateChildIdRequest:
continue;
case Neighbor::kStateParentRequest:
case Neighbor::kStateValid:
case Neighbor::kStateRestored:
case Neighbor::kStateChildUpdateRequest:
timeout = Timer::SecToMsec(mChildren[i].GetTimeout());
break;
case Neighbor::kStateLinkRequest:
assert(false);
break;
}
if ((Timer::GetNow() - mChildren[i].GetLastHeard()) >= timeout)
{
RemoveNeighbor(mChildren[i]);
}
}
// update router state
for (uint8_t i = 0; i <= kMaxRouterId; i++)
{
if (mRouters[i].GetState() == Neighbor::kStateValid)
{
if ((Timer::GetNow() - mRouters[i].GetLastHeard()) >= Timer::SecToMsec(kMaxNeighborAge))
{
RemoveNeighbor(mRouters[i]);
}
}
if (mRole == OT_DEVICE_ROLE_LEADER)
{
if (mRouters[i].IsAllocated())
{
if (!IsRouterIdValid(mRouters[i].GetNextHop()) &&
GetLinkCost(i) >= kMaxRouteCost &&
(Timer::GetNow() - mRouters[i].GetLastHeard()) >= Timer::SecToMsec(kMaxLeaderToRouterTimeout))
{
ReleaseRouterId(i);
}
}
else if (mRouters[i].IsReclaimDelay())
{
if ((Timer::GetNow() - mRouters[i].GetLastHeard()) >=
Timer::SecToMsec((kMaxLeaderToRouterTimeout + kRouterIdReuseDelay)))
{
mRouters[i].SetReclaimDelay(false);
}
}
}
}
SynchronizeChildNetworkData();
mStateUpdateTimer.Start(kStateUpdatePeriod);
exit:
return;
}
otError MleRouter::SendParentResponse(Child *aChild, const ChallengeTlv &challenge, bool aRoutersOnlyRequest)
{
otError error = OT_ERROR_NONE;
Ip6::Address destination;
Message *message;
uint16_t delay;
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
SuccessOrExit(error = AppendHeader(*message, Header::kCommandParentResponse));
SuccessOrExit(error = AppendSourceAddress(*message));
SuccessOrExit(error = AppendLeaderData(*message));
SuccessOrExit(error = AppendLinkFrameCounter(*message));
SuccessOrExit(error = AppendMleFrameCounter(*message));
SuccessOrExit(error = AppendResponse(*message, challenge.GetChallenge(), challenge.GetLength()));
aChild->GenerateChallenge();
SuccessOrExit(error = AppendChallenge(*message, aChild->GetChallenge(), aChild->GetChallengeSize()));
if (isAssignLinkQuality &&
(memcmp(mAddr64.m8, &aChild->GetExtAddress(), OT_EXT_ADDRESS_SIZE) == 0))
{
// use assigned one to ensure the link quality
SuccessOrExit(error = AppendLinkMargin(*message, mAssignLinkMargin));
}
else
{
error = AppendLinkMargin(*message, aChild->GetLinkInfo().GetLinkMargin(GetNetif().GetMac().GetNoiseFloor()));
SuccessOrExit(error);
}
SuccessOrExit(error = AppendConnectivity(*message));
SuccessOrExit(error = AppendVersion(*message));
memset(&destination, 0, sizeof(destination));
destination.mFields.m16[0] = HostSwap16(0xfe80);
destination.SetIid(aChild->GetExtAddress());
if (aRoutersOnlyRequest)
{
delay = (otPlatRandomGet() % kParentResponseMaxDelayRouters) + 1;
}
else
{
delay = (otPlatRandomGet() % kParentResponseMaxDelayAll) + 1;
}
SuccessOrExit(error = AddDelayedResponse(*message, destination, delay));
otLogInfoMle(GetInstance(), "Delayed Parent Response");
exit:
if (error != OT_ERROR_NONE && message != NULL)
{
message->Free();
}
return OT_ERROR_NONE;
}
otError MleRouter::UpdateChildAddresses(const AddressRegistrationTlv &aTlv, Child &aChild)
{
const AddressRegistrationEntry *entry;
Ip6::Address address;
Lowpan::Context context;
Child *child;
uint8_t count;
uint8_t index;
char stringBuffer[Ip6::Address::kIp6AddressStringSize];
aChild.ClearIp6Addresses();
for (count = 0; count < Child::kMaxIp6AddressPerChild; count++)
{
if ((entry = aTlv.GetAddressEntry(count)) == NULL)
{
break;
}
if (entry->IsCompressed())
{
// xxx check if context id exists
GetNetif().GetNetworkDataLeader().GetContext(entry->GetContextId(), context);
memcpy(&address, context.mPrefix, BitVectorBytes(context.mPrefixLength));
address.SetIid(entry->GetIid());
}
else
{
address = *entry->GetIp6Address();
}
aChild.GetIp6Address(count) = address;
otLogInfoMle(GetInstance(), "Child 0x%04x IPv6 address[%d]=%s", aChild.GetRloc16(), count,
address.ToString(stringBuffer, sizeof(stringBuffer)));
// We check if the same address is in-use by another child, if so
// remove it. This implements "last-in wins" duplicate address
// resolution policy.
//
// Duplicate addresses can occur if a previously attached child
// attaches to same parent again (after a reset, memory wipe) using
// a new random extended address before the old entry in the child
// table is timed out and then trying to register its globally unique
// IPv6 address as the new child.
for (int i = 0; i < mMaxChildrenAllowed; i++)
{
child = &mChildren[i];
if (!child->IsStateValidOrRestoring() || (child == &aChild))
{
continue;
}
if (child->FindIp6Address(address, &index) == OT_ERROR_NONE)
{
child->RemoveIp6Address(index);
}
}
}
if (count == 0)
{
otLogInfoMle(GetInstance(), "Child 0x%04x has no registered IPv6 address", aChild.GetRloc16());
}
else
{
otLogInfoMle(GetInstance(), "Child 0x%04x has %d registered IPv6 address%s", aChild.GetRloc16(), count,
(count == 1) ? "" : "es");
}
OT_UNUSED_VARIABLE(stringBuffer);
return OT_ERROR_NONE;
}
otError MleRouter::HandleChildIdRequest(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo,
uint32_t aKeySequence)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
const ThreadMessageInfo *threadMessageInfo = static_cast<const ThreadMessageInfo *>(aMessageInfo.GetLinkInfo());
Mac::ExtAddress macAddr;
ResponseTlv response;
LinkFrameCounterTlv linkFrameCounter;
MleFrameCounterTlv mleFrameCounter;
ModeTlv mode;
TimeoutTlv timeout;
AddressRegistrationTlv address;
TlvRequestTlv tlvRequest;
ActiveTimestampTlv activeTimestamp;
PendingTimestampTlv pendingTimestamp;
Child *child;
uint8_t numTlvs;
otLogInfoMle(GetInstance(), "Received Child ID Request");
// only process message when operating as a child, router, or leader
VerifyOrExit(mRole >= OT_DEVICE_ROLE_CHILD, error = OT_ERROR_INVALID_STATE);
// Find Child
macAddr.Set(aMessageInfo.GetPeerAddr());
VerifyOrExit((child = FindChild(macAddr)) != NULL, error = OT_ERROR_ALREADY);
// Response
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kResponse, sizeof(response), response));
VerifyOrExit(response.IsValid() &&
memcmp(response.GetResponse(), child->GetChallenge(), child->GetChallengeSize()) == 0,
error = OT_ERROR_SECURITY);
// Link-Layer Frame Counter
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kLinkFrameCounter, sizeof(linkFrameCounter),
linkFrameCounter));
VerifyOrExit(linkFrameCounter.IsValid(), error = OT_ERROR_PARSE);
// MLE Frame Counter
if (Tlv::GetTlv(aMessage, Tlv::kMleFrameCounter, sizeof(mleFrameCounter), mleFrameCounter) ==
OT_ERROR_NONE)
{
VerifyOrExit(mleFrameCounter.IsValid(), error = OT_ERROR_PARSE);
}
else
{
mleFrameCounter.SetFrameCounter(linkFrameCounter.GetFrameCounter());
}
// Mode
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kMode, sizeof(mode), mode));
VerifyOrExit(mode.IsValid(), error = OT_ERROR_PARSE);
// Timeout
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kTimeout, sizeof(timeout), timeout));
VerifyOrExit(timeout.IsValid(), error = OT_ERROR_PARSE);
// Ip6 Address
address.SetLength(0);
if ((mode.GetMode() & ModeTlv::kModeFFD) == 0)
{
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kAddressRegistration, sizeof(address), address));
VerifyOrExit(address.IsValid(), error = OT_ERROR_PARSE);
}
// TLV Request
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kTlvRequest, sizeof(tlvRequest), tlvRequest));
VerifyOrExit(tlvRequest.IsValid() && tlvRequest.GetLength() <= Child::kMaxRequestTlvs,
error = OT_ERROR_PARSE);
// Active Timestamp
activeTimestamp.SetLength(0);
if (Tlv::GetTlv(aMessage, Tlv::kActiveTimestamp, sizeof(activeTimestamp), activeTimestamp) == OT_ERROR_NONE)
{
VerifyOrExit(activeTimestamp.IsValid(), error = OT_ERROR_PARSE);
}
// Pending Timestamp
pendingTimestamp.SetLength(0);
if (Tlv::GetTlv(aMessage, Tlv::kPendingTimestamp, sizeof(pendingTimestamp), pendingTimestamp) == OT_ERROR_NONE)
{
VerifyOrExit(pendingTimestamp.IsValid(), error = OT_ERROR_PARSE);
}
// Remove from router table
for (int i = 0; i <= kMaxRouterId; i++)
{
if (mRouters[i].GetState() != Neighbor::kStateInvalid &&
memcmp(&mRouters[i].GetExtAddress(), &macAddr, sizeof(macAddr)) == 0)
{
RemoveNeighbor(mRouters[i]);
break;
}
}
if (child->GetState() != Neighbor::kStateValid)
{
child->SetState(Neighbor::kStateChildIdRequest);
}
else
{
RemoveStoredChild(child->GetRloc16());
if (!child->IsRxOnWhenIdle())
{
netif.GetMeshForwarder().ClearChildIndirectMessages(*child);
}
}
child->SetLastHeard(Timer::GetNow());
child->SetLinkFrameCounter(linkFrameCounter.GetFrameCounter());
child->SetMleFrameCounter(mleFrameCounter.GetFrameCounter());
child->SetKeySequence(aKeySequence);
child->SetDeviceMode(mode.GetMode());
child->GetLinkInfo().AddRss(netif.GetMac().GetNoiseFloor(), threadMessageInfo->mRss);
child->SetTimeout(timeout.GetTimeout());
if (mode.GetMode() & ModeTlv::kModeFullNetworkData)
{
child->SetNetworkDataVersion(mLeaderData.GetDataVersion());
}
else
{
child->SetNetworkDataVersion(mLeaderData.GetStableDataVersion());
}
UpdateChildAddresses(address, *child);
child->ClearRequestTlvs();
for (numTlvs = 0; numTlvs < tlvRequest.GetLength(); numTlvs++)
{
child->SetRequestTlv(numTlvs, tlvRequest.GetTlvs()[numTlvs]);
}
if (activeTimestamp.GetLength() == 0 ||
netif.GetActiveDataset().Compare(activeTimestamp) != 0)
{
child->SetRequestTlv(numTlvs++, Tlv::kActiveDataset);
}
if (pendingTimestamp.GetLength() == 0 ||
netif.GetPendingDataset().Compare(pendingTimestamp) != 0)
{
child->SetRequestTlv(numTlvs++, Tlv::kPendingDataset);
}
switch (mRole)
{
case OT_DEVICE_ROLE_DISABLED:
case OT_DEVICE_ROLE_DETACHED:
assert(false);
break;
case OT_DEVICE_ROLE_CHILD:
child->SetState(Neighbor::kStateChildIdRequest);
BecomeRouter(ThreadStatusTlv::kHaveChildIdRequest);
break;
case OT_DEVICE_ROLE_ROUTER:
case OT_DEVICE_ROLE_LEADER:
SuccessOrExit(error = SendChildIdResponse(child));
break;
}
exit:
return error;
}
otError MleRouter::HandleChildUpdateRequest(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo,
uint32_t aKeySequence)
{
static const uint8_t kMaxResponseTlvs = 10;
otError error = OT_ERROR_NONE;
Mac::ExtAddress macAddr;
ModeTlv mode;
ChallengeTlv challenge;
AddressRegistrationTlv address;
LeaderDataTlv leaderData;
TimeoutTlv timeout;
Child *child;
TlvRequestTlv tlvRequest;
uint8_t tlvs[kMaxResponseTlvs];
uint8_t tlvslength = 0;
otLogInfoMle(GetInstance(), "Received Child Update Request from child");
// Mode
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kMode, sizeof(mode), mode));
VerifyOrExit(mode.IsValid(), error = OT_ERROR_PARSE);
// Find Child
macAddr.Set(aMessageInfo.GetPeerAddr());
child = FindChild(macAddr);
tlvs[tlvslength++] = Tlv::kSourceAddress;
// Not proceed if the Child Update Request is from the peer which is not the device's child or
// which was the device's child but becomes invalid.
if (child == NULL || child->GetState() == Neighbor::kStateInvalid)
{
// For invalid non-sleepy child, Send Child Update Response with status TLV (error)
if (mode.GetMode() & ModeTlv::kModeRxOnWhenIdle)
{
tlvs[tlvslength++] = Tlv::kStatus;
SendChildUpdateResponse(NULL, aMessageInfo, tlvs, tlvslength, NULL);
}
ExitNow();
}
child->SetDeviceMode(mode.GetMode());
tlvs[tlvslength++] = Tlv::kMode;
// Parent MUST include Leader Data TLV in Child Update Response
tlvs[tlvslength++] = Tlv::kLeaderData;
// Challenge
if (Tlv::GetTlv(aMessage, Tlv::kChallenge, sizeof(challenge), challenge) == OT_ERROR_NONE)
{
VerifyOrExit(challenge.IsValid(), error = OT_ERROR_PARSE);
tlvs[tlvslength++] = Tlv::kResponse;
tlvs[tlvslength++] = Tlv::kMleFrameCounter;
tlvs[tlvslength++] = Tlv::kLinkFrameCounter;
}
// Ip6 Address TLV
if (Tlv::GetTlv(aMessage, Tlv::kAddressRegistration, sizeof(address), address) == OT_ERROR_NONE)
{
VerifyOrExit(address.IsValid(), error = OT_ERROR_PARSE);
UpdateChildAddresses(address, *child);
tlvs[tlvslength++] = Tlv::kAddressRegistration;
}
// Leader Data
if (Tlv::GetTlv(aMessage, Tlv::kLeaderData, sizeof(leaderData), leaderData) == OT_ERROR_NONE)
{
VerifyOrExit(leaderData.IsValid(), error = OT_ERROR_PARSE);
}
// Timeout
if (Tlv::GetTlv(aMessage, Tlv::kTimeout, sizeof(timeout), timeout) == OT_ERROR_NONE)
{
VerifyOrExit(timeout.IsValid(), error = OT_ERROR_PARSE);
child->SetTimeout(timeout.GetTimeout());
tlvs[tlvslength++] = Tlv::kTimeout;
}
// TLV Request
if (Tlv::GetTlv(aMessage, Tlv::kTlvRequest, sizeof(tlvRequest), tlvRequest) == OT_ERROR_NONE)
{
uint8_t tlv;
TlvRequestIterator iterator = TLVREQUESTTLV_ITERATOR_INIT;
VerifyOrExit(tlvRequest.IsValid() && tlvRequest.GetLength() <= (Child::kMaxRequestTlvs - tlvslength),
error = OT_ERROR_PARSE);
while (tlvRequest.GetNextTlv(iterator, tlv) == OT_ERROR_NONE)
{
// Here skips Tlv::kLeaderData because it has already been included by default
if (tlv != Tlv::kLeaderData)
{
tlvs[tlvslength++] = tlv;
}
}
}
child->SetLastHeard(Timer::GetNow());
if (child->IsStateRestoring())
{
SetChildStateToValid(child);
child->SetKeySequence(aKeySequence);
}
SendChildUpdateResponse(child, aMessageInfo, tlvs, tlvslength, &challenge);
exit:
return error;
}
otError MleRouter::HandleChildUpdateResponse(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo,
uint32_t aKeySequence)
{
otError error = OT_ERROR_NONE;
const ThreadMessageInfo *threadMessageInfo = static_cast<const ThreadMessageInfo *>(aMessageInfo.GetLinkInfo());
Mac::ExtAddress macAddr;
SourceAddressTlv sourceAddress;
TimeoutTlv timeout;
AddressRegistrationTlv address;
ResponseTlv response;
LinkFrameCounterTlv linkFrameCounter;
MleFrameCounterTlv mleFrameCounter;
LeaderDataTlv leaderData;
Child *child;
otLogInfoMle(GetInstance(), "Received Child Update Response from child");
// Find Child
macAddr.Set(aMessageInfo.GetPeerAddr());
VerifyOrExit((child = FindChild(macAddr)) != NULL, error = OT_ERROR_NOT_FOUND);
// Source Address
if (Tlv::GetTlv(aMessage, Tlv::kSourceAddress, sizeof(sourceAddress), sourceAddress) == OT_ERROR_NONE)
{
VerifyOrExit(sourceAddress.IsValid(), error = OT_ERROR_PARSE);
VerifyOrExit(child->GetRloc16() == sourceAddress.GetRloc16(), error = OT_ERROR_PARSE);
}
// Response
if (Tlv::GetTlv(aMessage, Tlv::kResponse, sizeof(response), response) == OT_ERROR_NONE)
{
VerifyOrExit(response.IsValid() &&
memcmp(response.GetResponse(), child->GetChallenge(), child->GetChallengeSize()) == 0,
error = OT_ERROR_SECURITY);
}
// Link-Layer Frame Counter
if (Tlv::GetTlv(aMessage, Tlv::kLinkFrameCounter, sizeof(linkFrameCounter), linkFrameCounter) == OT_ERROR_NONE)
{
VerifyOrExit(linkFrameCounter.IsValid(), error = OT_ERROR_PARSE);
child->SetLinkFrameCounter(linkFrameCounter.GetFrameCounter());
}
// MLE Frame Counter
if (Tlv::GetTlv(aMessage, Tlv::kMleFrameCounter, sizeof(mleFrameCounter), mleFrameCounter) == OT_ERROR_NONE)
{
VerifyOrExit(mleFrameCounter.IsValid(), error = OT_ERROR_PARSE);
child->SetMleFrameCounter(mleFrameCounter.GetFrameCounter());
}
// Timeout
if (Tlv::GetTlv(aMessage, Tlv::kTimeout, sizeof(timeout), timeout) == OT_ERROR_NONE)
{
VerifyOrExit(timeout.IsValid(), error = OT_ERROR_PARSE);
child->SetTimeout(timeout.GetTimeout());
}
// Ip6 Address
if (Tlv::GetTlv(aMessage, Tlv::kAddressRegistration, sizeof(address), address) == OT_ERROR_NONE)
{
VerifyOrExit(address.IsValid(), error = OT_ERROR_PARSE);
UpdateChildAddresses(address, *child);
}
// Leader Data
if (Tlv::GetTlv(aMessage, Tlv::kLeaderData, sizeof(leaderData), leaderData) == OT_ERROR_NONE)
{
VerifyOrExit(leaderData.IsValid(), error = OT_ERROR_PARSE);
if (child->IsFullNetworkData())
{
child->SetNetworkDataVersion(leaderData.GetDataVersion());
}
else
{
child->SetNetworkDataVersion(leaderData.GetStableDataVersion());
}
}
SetChildStateToValid(child);
child->SetLastHeard(Timer::GetNow());
child->SetKeySequence(aKeySequence);
child->GetLinkInfo().AddRss(GetNetif().GetMac().GetNoiseFloor(), threadMessageInfo->mRss);
exit:
return error;
}
otError MleRouter::HandleDataRequest(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
TlvRequestTlv tlvRequest;
ActiveTimestampTlv activeTimestamp;
PendingTimestampTlv pendingTimestamp;
uint8_t tlvs[4];
uint8_t numTlvs;
otLogInfoMle(GetInstance(), "Received Data Request");
// TLV Request
SuccessOrExit(error = Tlv::GetTlv(aMessage, Tlv::kTlvRequest, sizeof(tlvRequest), tlvRequest));
VerifyOrExit(tlvRequest.IsValid() && tlvRequest.GetLength() <= sizeof(tlvs), error = OT_ERROR_PARSE);
// Active Timestamp
activeTimestamp.SetLength(0);
if (Tlv::GetTlv(aMessage, Tlv::kActiveTimestamp, sizeof(activeTimestamp), activeTimestamp) == OT_ERROR_NONE)
{
VerifyOrExit(activeTimestamp.IsValid(), error = OT_ERROR_PARSE);
}
// Pending Timestamp
pendingTimestamp.SetLength(0);
if (Tlv::GetTlv(aMessage, Tlv::kPendingTimestamp, sizeof(pendingTimestamp), pendingTimestamp) == OT_ERROR_NONE)
{
VerifyOrExit(pendingTimestamp.IsValid(), error = OT_ERROR_PARSE);
}
memset(tlvs, Tlv::kInvalid, sizeof(tlvs));
memcpy(tlvs, tlvRequest.GetTlvs(), tlvRequest.GetLength());
numTlvs = tlvRequest.GetLength();
if (activeTimestamp.GetLength() == 0 ||
netif.GetActiveDataset().Compare(activeTimestamp))
{
tlvs[numTlvs++] = Tlv::kActiveDataset;
}
if (pendingTimestamp.GetLength() == 0 ||
netif.GetPendingDataset().Compare(pendingTimestamp))
{
tlvs[numTlvs++] = Tlv::kPendingDataset;
}
SendDataResponse(aMessageInfo.GetPeerAddr(), tlvs, numTlvs, 0);
exit:
return error;
}
otError MleRouter::HandleNetworkDataUpdateRouter(void)
{
static const uint8_t tlvs[] = {Tlv::kNetworkData};
Ip6::Address destination;
uint16_t delay;
VerifyOrExit(mRole == OT_DEVICE_ROLE_ROUTER || mRole == OT_DEVICE_ROLE_LEADER);
memset(&destination, 0, sizeof(destination));
destination.mFields.m16[0] = HostSwap16(0xff02);
destination.mFields.m16[7] = HostSwap16(0x0001);
delay = (mRole == OT_DEVICE_ROLE_LEADER) ? 0 : (otPlatRandomGet() % kUnsolicitedDataResponseJitter);
SendDataResponse(destination, tlvs, sizeof(tlvs), delay);
SynchronizeChildNetworkData();
exit:
return OT_ERROR_NONE;
}
void MleRouter::SynchronizeChildNetworkData(void)
{
ThreadNetif &netif = GetNetif();
VerifyOrExit(mRole == OT_DEVICE_ROLE_ROUTER || mRole == OT_DEVICE_ROLE_LEADER);
for (uint8_t i = 0; i < mMaxChildrenAllowed; i++)
{
Child *child = &mChildren[i];
uint8_t version;
if (child->GetState() != Neighbor::kStateValid || child->IsRxOnWhenIdle())
{
continue;
}
if (child->IsFullNetworkData())
{
version = netif.GetNetworkDataLeader().GetVersion();
}
else
{
version = netif.GetNetworkDataLeader().GetStableVersion();
}
if (child->GetNetworkDataVersion() == version)
{
continue;
}
SuccessOrExit(SendChildUpdateRequest(child));
}
exit:
return;
}
#if OPENTHREAD_CONFIG_ENABLE_STEERING_DATA_SET_OOB
otError MleRouter::SetSteeringData(otExtAddress *aExtAddress)
{
otError error = OT_ERROR_NONE;
uint8_t nullExtAddr[OT_EXT_ADDRESS_SIZE];
uint8_t allowAnyExtAddr[OT_EXT_ADDRESS_SIZE];
memset(nullExtAddr, 0, sizeof(nullExtAddr));
memset(allowAnyExtAddr, 0xFF, sizeof(allowAnyExtAddr));
mSteeringData.Init();
if ((aExtAddress == NULL) || (memcmp(aExtAddress, &nullExtAddr, sizeof(nullExtAddr)) == 0))
{
// Clear steering data
mSteeringData.Clear();
}
else if (memcmp(aExtAddress, &allowAnyExtAddr, sizeof(allowAnyExtAddr)) == 0)
{
// Set steering data to 0xFF
mSteeringData.SetLength(1);
mSteeringData.Set();
}
else
{
// Set bloom filter with the extended address passed in
mSteeringData.ComputeBloomFilter(aExtAddress);
}
return error;
}
#endif // OPENTHREAD_CONFIG_ENABLE_STEERING_DATA_SET_OOB
otError MleRouter::HandleDiscoveryRequest(const Message &aMessage, const Ip6::MessageInfo &aMessageInfo)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
Tlv tlv;
MeshCoP::Tlv meshcopTlv;
MeshCoP::DiscoveryRequestTlv discoveryRequest;
MeshCoP::ExtendedPanIdTlv extPanId;
uint16_t offset;
uint16_t end;
otLogInfoMle(GetInstance(), "Received discovery request");
// only Routers and REEDs respond
VerifyOrExit((mDeviceMode & ModeTlv::kModeFFD) != 0, error = OT_ERROR_INVALID_STATE);
// find MLE Discovery TLV
VerifyOrExit(Tlv::GetOffset(aMessage, Tlv::kDiscovery, offset) == OT_ERROR_NONE, error = OT_ERROR_PARSE);
aMessage.Read(offset, sizeof(tlv), &tlv);
offset += sizeof(tlv);
end = offset + sizeof(tlv) + tlv.GetLength();
while (offset < end)
{
aMessage.Read(offset, sizeof(meshcopTlv), &meshcopTlv);
switch (meshcopTlv.GetType())
{
case MeshCoP::Tlv::kDiscoveryRequest:
aMessage.Read(offset, sizeof(discoveryRequest), &discoveryRequest);
VerifyOrExit(discoveryRequest.IsValid(), error = OT_ERROR_PARSE);
if (discoveryRequest.IsJoiner())
{
#if OPENTHREAD_CONFIG_ENABLE_STEERING_DATA_SET_OOB
if (!mSteeringData.IsCleared())
{
break;
}
else // if steering data is not set out of band, fall back to network data
#endif // OPENTHREAD_CONFIG_ENABLE_STEERING_DATA_SET_OOB
{
VerifyOrExit(netif.GetNetworkDataLeader().IsJoiningEnabled(), error = OT_ERROR_NOT_CAPABLE);
}
}
break;
case MeshCoP::Tlv::kExtendedPanId:
aMessage.Read(offset, sizeof(extPanId), &extPanId);
VerifyOrExit(extPanId.IsValid(), error = OT_ERROR_PARSE);
VerifyOrExit(memcmp(netif.GetMac().GetExtendedPanId(), extPanId.GetExtendedPanId(), OT_EXT_PAN_ID_SIZE),
error = OT_ERROR_DROP);
break;
default:
break;
}
offset += sizeof(meshcopTlv) + meshcopTlv.GetLength();
}
error = SendDiscoveryResponse(aMessageInfo.GetPeerAddr(), aMessage.GetPanId());
exit:
if (error != OT_ERROR_NONE)
{
otLogWarnMleErr(GetInstance(), error, "Failed to process Discovery Request");
}
return error;
}
otError MleRouter::SendDiscoveryResponse(const Ip6::Address &aDestination, uint16_t aPanId)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
Message *message;
uint16_t startOffset;
Tlv tlv;
MeshCoP::DiscoveryResponseTlv discoveryResponse;
MeshCoP::ExtendedPanIdTlv extPanId;
MeshCoP::NetworkNameTlv networkName;
MeshCoP::JoinerUdpPortTlv joinerUdpPort;
MeshCoP::Tlv *steeringData;
uint16_t delay;
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
message->SetSubType(Message::kSubTypeMleDiscoverResponse);
message->SetPanId(aPanId);
SuccessOrExit(error = AppendHeader(*message, Header::kCommandDiscoveryResponse));
// Discovery TLV
tlv.SetType(Tlv::kDiscovery);
SuccessOrExit(error = message->Append(&tlv, sizeof(tlv)));
startOffset = message->GetLength();
// Discovery Response TLV
discoveryResponse.Init();
discoveryResponse.SetVersion(kVersion);
if (netif.GetKeyManager().GetSecurityPolicyFlags() & OT_SECURITY_POLICY_NATIVE_COMMISSIONING)
{
discoveryResponse.SetNativeCommissioner(true);
}
else
{
discoveryResponse.SetNativeCommissioner(false);
}
SuccessOrExit(error = message->Append(&discoveryResponse, sizeof(discoveryResponse)));
// Extended PAN ID TLV
extPanId.Init();
extPanId.SetExtendedPanId(netif.GetMac().GetExtendedPanId());
SuccessOrExit(error = message->Append(&extPanId, sizeof(extPanId)));
// Network Name TLV
networkName.Init();
networkName.SetNetworkName(netif.GetMac().GetNetworkName());
SuccessOrExit(error = message->Append(&networkName, sizeof(tlv) + networkName.GetLength()));
#if OPENTHREAD_CONFIG_ENABLE_STEERING_DATA_SET_OOB
// If steering data is set out of band, use that value.
// Otherwise use the one from commissioning data.
if (!mSteeringData.IsCleared())
{
SuccessOrExit(error = message->Append(&mSteeringData, sizeof(mSteeringData) + mSteeringData.GetLength()));
}
else
#endif // OPENTHREAD_CONFIG_ENABLE_STEERING_DATA_SET_OOB
{
// Steering Data TLV
steeringData = netif.GetNetworkDataLeader().GetCommissioningDataSubTlv(MeshCoP::Tlv::kSteeringData);
if (steeringData != NULL)
{
SuccessOrExit(error = message->Append(steeringData, sizeof(*steeringData) + steeringData->GetLength()));
}
}
// Joiner UDP Port TLV
joinerUdpPort.Init();
joinerUdpPort.SetUdpPort(netif.GetJoinerRouter().GetJoinerUdpPort());
SuccessOrExit(error = message->Append(&joinerUdpPort, sizeof(tlv) + joinerUdpPort.GetLength()));
tlv.SetLength(static_cast<uint8_t>(message->GetLength() - startOffset));
message->Write(startOffset - sizeof(tlv), sizeof(tlv), &tlv);
delay = otPlatRandomGet() % (kDiscoveryMaxJitter + 1);
SuccessOrExit(error = AddDelayedResponse(*message, aDestination, delay));
otLogInfoMle(GetInstance(), "Sent discovery response");
exit:
if (error != OT_ERROR_NONE && message != NULL)
{
message->Free();
}
return error;
}
otError MleRouter::SendChildIdResponse(Child *aChild)
{
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
Ip6::Address destination;
Message *message;
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
SuccessOrExit(error = AppendHeader(*message, Header::kCommandChildIdResponse));
SuccessOrExit(error = AppendSourceAddress(*message));
SuccessOrExit(error = AppendLeaderData(*message));
SuccessOrExit(error = AppendActiveTimestamp(*message));
SuccessOrExit(error = AppendPendingTimestamp(*message));
if (aChild->GetRloc16() == 0)
{
// pick next Child ID that is not being used
do
{
mNextChildId++;
if (mNextChildId > kMaxChildId)
{
mNextChildId = kMinChildId;
}
}
while (FindChild(mNextChildId) != NULL);
// allocate Child ID
aChild->SetRloc16(netif.GetMac().GetShortAddress() | mNextChildId);
}
SuccessOrExit(error = AppendAddress16(*message, aChild->GetRloc16()));
for (uint8_t i = 0; i < Child::kMaxRequestTlvs; i++)
{
switch (aChild->GetRequestTlv(i))
{
case Tlv::kNetworkData:
SuccessOrExit(error = AppendNetworkData(*message, !aChild->IsFullNetworkData()));
break;
case Tlv::kRoute:
SuccessOrExit(error = AppendRoute(*message));
break;
case Tlv::kActiveDataset:
SuccessOrExit(error = AppendActiveDataset(*message));
break;
case Tlv::kPendingDataset:
SuccessOrExit(error = AppendPendingDataset(*message));
break;
default:
break;
}
}
if (!aChild->IsFullThreadDevice())
{
SuccessOrExit(error = AppendChildAddresses(*message, *aChild));
}
SetChildStateToValid(aChild);
if (!aChild->IsRxOnWhenIdle())
{
netif.GetMeshForwarder().GetSourceMatchController().SetSrcMatchAsShort(*aChild, false);
}
memset(&destination, 0, sizeof(destination));
destination.mFields.m16[0] = HostSwap16(0xfe80);
destination.SetIid(aChild->GetExtAddress());
SuccessOrExit(error = SendMessage(*message, destination));
otLogInfoMle(GetInstance(), "Sent Child ID Response");
exit:
if (error != OT_ERROR_NONE && message != NULL)
{
message->Free();
}
return error;
}
otError MleRouter::SendChildUpdateRequest(Child *aChild)
{
static const uint8_t tlvs[] = {Tlv::kTimeout, Tlv::kAddressRegistration};
ThreadNetif &netif = GetNetif();
otError error = OT_ERROR_NONE;
Ip6::Address destination;
Message *message;
if (!aChild->IsRxOnWhenIdle())
{
uint8_t childIndex = netif.GetMle().GetChildIndex(*aChild);
// No need to send "Child Update Request" to the sleepy child if there is one already queued for it.
for (message = netif.GetMeshForwarder().GetSendQueue().GetHead(); message; message = message->GetNext())
{
if (message->GetChildMask(childIndex) && message->GetSubType() == Message::kSubTypeMleChildUpdateRequest)
{
ExitNow();
}
}
}
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
message->SetSubType(Message::kSubTypeMleChildUpdateRequest);
SuccessOrExit(error = AppendHeader(*message, Header::kCommandChildUpdateRequest));
SuccessOrExit(error = AppendSourceAddress(*message));
SuccessOrExit(error = AppendLeaderData(*message));
SuccessOrExit(error = AppendNetworkData(*message, !aChild->IsFullNetworkData()));
SuccessOrExit(error = AppendActiveTimestamp(*message));
SuccessOrExit(error = AppendPendingTimestamp(*message));
SuccessOrExit(error = AppendTlvRequest(*message, tlvs, sizeof(tlvs)));
aChild->GenerateChallenge();
SuccessOrExit(error = AppendChallenge(*message, aChild->GetChallenge(), aChild->GetChallengeSize()));
memset(&destination, 0, sizeof(destination));
destination.mFields.m16[0] = HostSwap16(0xfe80);
destination.SetIid(aChild->GetExtAddress());
SuccessOrExit(error = SendMessage(*message, destination));
if (aChild->IsRxOnWhenIdle())
{
// only try to send a single Child Update Request message to an rx-on-when-idle child
aChild->SetState(Child::kStateChildUpdateRequest);
}
otLogInfoMle(GetInstance(), "Sent Child Update Request to child");
exit:
if (error != OT_ERROR_NONE && message != NULL)
{
message->Free();
}
return error;
}
otError MleRouter::SendChildUpdateResponse(Child *aChild, const Ip6::MessageInfo &aMessageInfo,
const uint8_t *aTlvs, uint8_t aTlvslength,
const ChallengeTlv *aChallenge)
{
otError error = OT_ERROR_NONE;
Message *message;
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
SuccessOrExit(error = AppendHeader(*message, Header::kCommandChildUpdateResponse));
for (int i = 0; i < aTlvslength; i++)
{
switch (aTlvs[i])
{
case Tlv::kStatus:
SuccessOrExit(error = AppendStatus(*message, StatusTlv::kError));
break;
case Tlv::kAddressRegistration:
SuccessOrExit(error = AppendChildAddresses(*message, *aChild));
break;
case Tlv::kLeaderData:
SuccessOrExit(error = AppendLeaderData(*message));
break;
case Tlv::kMode:
SuccessOrExit(error = AppendMode(*message, aChild->GetDeviceMode()));
break;
case Tlv::kNetworkData:
SuccessOrExit(error = AppendNetworkData(*message, !aChild->IsFullNetworkData()));
SuccessOrExit(error = AppendActiveTimestamp(*message));
SuccessOrExit(error = AppendPendingTimestamp(*message));
break;
case Tlv::kResponse:
SuccessOrExit(error = AppendResponse(*message, aChallenge->GetChallenge(), aChallenge->GetLength()));
break;
case Tlv::kSourceAddress:
SuccessOrExit(error = AppendSourceAddress(*message));
break;
case Tlv::kTimeout:
SuccessOrExit(error = AppendTimeout(*message, aChild->GetTimeout()));
break;
case Tlv::kMleFrameCounter:
SuccessOrExit(error = AppendMleFrameCounter(*message));
break;
case Tlv::kLinkFrameCounter:
SuccessOrExit(error = AppendLinkFrameCounter(*message));
break;
}
}
SuccessOrExit(error = SendMessage(*message, aMessageInfo.GetPeerAddr()));
otLogInfoMle(GetInstance(), "Sent Child Update Response to child");
exit:
if (error != OT_ERROR_NONE && message != NULL)
{
message->Free();
}
return OT_ERROR_NONE;
}
otError MleRouter::SendDataResponse(const Ip6::Address &aDestination, const uint8_t *aTlvs, uint8_t aTlvsLength,
uint16_t aDelay)
{
otError error = OT_ERROR_NONE;
Message *message;
Neighbor *neighbor;
bool stableOnly;
VerifyOrExit((message = NewMleMessage()) != NULL, error = OT_ERROR_NO_BUFS);
SuccessOrExit(error = AppendHeader(*message, Header::kCommandDataResponse));
SuccessOrExit(error = AppendSourceAddress(*message));