void Mpl::InitOption(OptionMpl &aOption, uint16_t aSeed)
{
aOption.Init();
aOption.SetSeedLength(OptionMpl::kSeedLength2);
aOption.SetSequence(mSequence++);
aOption.SetSeed(aSeed);
}
otError Mpl::ProcessOption(Message &aMessage, const Address &aAddress, bool aIsOutbound)
{
otError error;
OptionMpl option;
VerifyOrExit(aMessage.Read(aMessage.GetOffset(), sizeof(option), &option) >= OptionMpl::kMinLength &&
(option.GetSeedIdLength() == OptionMpl::kSeedIdLength0 ||
option.GetSeedIdLength() == OptionMpl::kSeedIdLength2),
error = OT_ERROR_DROP);
if (option.GetSeedIdLength() == OptionMpl::kSeedIdLength0)
{
// Retrieve MPL Seed Id from the IPv6 Source Address.
option.SetSeedId(HostSwap16(aAddress.mFields.m16[7]));
}
// Check MPL Data Messages in the MPL Buffered Set against sequence number.
UpdateBufferedSet(option.GetSeedId(), option.GetSequence());
// Check if the MPL Data Message is new.
error = UpdateSeedSet(option.GetSeedId(), option.GetSequence());
if (error == OT_ERROR_NONE)
{
AddBufferedMessage(aMessage, option.GetSeedId(), option.GetSequence(), aIsOutbound);
}
else if (aIsOutbound)
{
// In case MPL Data Message is generated locally, ignore potential error of the MPL Seed Set
// to allow subsequent retransmissions with the same sequence number.
ExitNow(error = OT_ERROR_NONE);
}
exit:
return error;
}
void Mpl::InitOption(OptionMpl &aOption, const Address &aAddress)
{
aOption.Init();
aOption.SetSequence(mSequence++);
// Check if Seed Id can be elided.
if (mMatchingAddress && aAddress == *mMatchingAddress)
{
aOption.SetSeedIdLength(OptionMpl::kSeedIdLength0);
// Decrease default option length.
aOption.SetLength(aOption.GetLength() - sizeof(mSeedId));
}
else
{
aOption.SetSeedIdLength(OptionMpl::kSeedIdLength2);
aOption.SetSeedId(mSeedId);
}
}
ThreadError Mpl::ProcessOption(const Message &aMessage)
{
ThreadError error = kThreadError_None;
OptionMpl option;
MplEntry *entry = NULL;
int8_t diff;
VerifyOrExit(aMessage.Read(aMessage.GetOffset(), sizeof(option), &option) == sizeof(option) &&
option.GetLength() == sizeof(OptionMpl) - sizeof(OptionHeader),
error = kThreadError_Drop);
for (int i = 0; i < kNumEntries; i++)
{
if (mEntries[i].mLifetime == 0)
{
entry = &mEntries[i];
}
else if (mEntries[i].mSeed == option.GetSeed())
{
entry = &mEntries[i];
diff = option.GetSequence() - entry->mSequence;
if (diff <= 0)
{
error = kThreadError_Drop;
}
break;
}
}
VerifyOrExit(entry != NULL, error = kThreadError_Drop);
entry->mSeed = option.GetSeed();
entry->mSequence = option.GetSequence();
entry->mLifetime = kLifetime;
mTimer.Start(1000);
exit:
return error;
}
