void
EdgeStrategy::onDataDenied
( const ndn::Data& data,
const ndn::Interest& interest,
ns3::Time& delay,
const std::string& why )
{
// if the denied data isn't leaving the network
// then we just do the normal router stuff
auto in_face = getFaceTable().get( data.getIncomingFaceId() );
auto out_face = getFaceTable().get( interest.getIncomingFaceId() );
bool coming_from_network = !in_face->isEdge();
bool going_to_network = !out_face->isEdge();
if( coming_from_network == going_to_network )
{
RouterStrategy::onDataDenied( data, interest, delay, why );
return;
}
if( going_to_network )
{
BOOST_ASSERT( data.getCurrentNetwork()
== ndn::RouteTracker::INTERNET_NETWORK );
RouterStrategy::onDataDenied( data, interest, delay, why );
return;
}
// if the data is denied then we add the
// tag used to retrieve it to the negative
// cache; however we only want to do this
// when the data is leaving the internet
// and going into the client network
// and the data's access level > 0
BOOST_ASSERT( data.getCurrentNetwork()
== ndn::RouteTracker::ENTRY_NETWORK );
if( data.getAccessLevel() > 0 )
{
BOOST_ASSERT( interest.hasAuthTag() );
tracers::edge->bloom_insert
( interest.getAuthTag(), s_edge_bloom_delay );
delay += s_edge_bloom_delay;
m_negative_cache.insert( interest.getAuthTag() );
}
// do whatever a normal router would do
RouterStrategy::onDataDenied( data, interest, delay, why );
}
void
EdgeStrategy::onDataSatisfied
( const ndn::Data& data,
const ndn::Interest& interest,
ns3::Time& delay )
{
// if the satisfied data isn't leaving the network
// then we just do the normal router stuff
auto in_face = getFaceTable().get( data.getIncomingFaceId() );
auto out_face = getFaceTable().get( interest.getIncomingFaceId() );
bool coming_from_network = !in_face->isEdge();
bool going_to_network = !out_face->isEdge();
if( coming_from_network == going_to_network )
{
RouterStrategy::onDataSatisfied( data, interest, delay );
return;
}
if( going_to_network )
{
BOOST_ASSERT( data.getCurrentNetwork()
== ndn::RouteTracker::INTERNET_NETWORK );
RouterStrategy::onDataSatisfied( data, interest, delay );
return;
}
// if the data is satisfied then we add it to
// the positive cache if it isn't marked with
// the no recache flag and if its access level > 0
BOOST_ASSERT( data.getCurrentNetwork()
== ndn::RouteTracker::ENTRY_NETWORK );
if( !data.getNoReCacheFlag()
&& data.getAccessLevel() > 0 )
{
BOOST_ASSERT( interest.hasAuthTag() );
tracers::edge->bloom_insert
( interest.getAuthTag(), s_edge_bloom_delay );
delay += s_edge_bloom_delay;
m_positive_cache.insert( interest.getAuthTag() );
}
RouterStrategy::onDataSatisfied( data, interest, delay );
}
bool
EdgeStrategy::filterOutgoingInterest
( const nfd::Face& face,
ndn::Interest& interest,
ns3::Time& delay )
{
auto in_face = getFaceTable().get( interest.getIncomingFaceId() );
bool coming_from_network = !in_face->isEdge();
bool going_to_network = !face.isEdge();
// if the interest coming from and going to
// the same network then we don't need to do
// anything special
if( coming_from_network == going_to_network )
{
return RouterStrategy::filterOutgoingInterest
( face, interest, delay );
}
// if the interest is leaving the network then just change
// current network
if( coming_from_network )
{
BOOST_ASSERT( interest.getCurrentNetwork()
== ndn::RouteTracker::INTERNET_NETWORK );
tracers::edge->interest_left( interest );
interest.setCurrentNetwork( ndn::RouteTracker::EXIT_NETWORK );
return RouterStrategy::filterOutgoingInterest
( face, interest, delay );
}
// if the interest is entering the network then
// we need to do some extra stuff
BOOST_ASSERT( interest.getCurrentNetwork()
== ndn::RouteTracker::ENTRY_NETWORK );
tracers::edge->interest_entered( interest );
interest.setCurrentNetwork( ndn::RouteTracker::INTERNET_NETWORK );
// if the interest doesn't have an auth tag, or its auth level
// is 0 then we don't do any authentication
if( !interest.hasAuthTag()
|| interest.getAuthTag().getAccessLevel() == 0 )
{
return RouterStrategy::filterOutgoingInterest( face,
interest,
delay );
}
const ndn::AuthTag& auth = interest.getAuthTag();
// if the auth tag provided by the interest is expired
// then we can drop the interest
if( auth.isExpired() )
{
tracers::edge->blocked_interest
( interest, tracers::BlockedExpired );
onInterestDropped( interest, face, "Expired auth" );
return false;
}
// if the interest and auth tag have different prefixes
// then we drop the interest
if( !auth.getPrefix().isPrefixOf( interest.getName() ) )
{
tracers::edge->blocked_interest
( interest, tracers::BlockedBadPrefix );
onInterestDropped( interest, face, "Mismatched prefix" );
return false;
}
// if the interest route hash doesn't match its auth tag
// then we can drop it
if( interest.getEntryRoute() != auth.getRouteHash() )
{
tracers::edge->blocked_interest
( interest, tracers::BlockedBadRoute );
onInterestDropped( interest, face, "Bad route" );
return false;
}
// if the interest auth is in the positive auth cache then
// we set its auth validity probability
tracers::edge->bloom_lookup( auth, s_edge_bloom_delay );
delay += s_edge_bloom_delay;
if( m_positive_cache.contains( auth ) )
{
double fpp = m_positive_cache.getEffectiveFPP();
double prob = (double)1.0 - fpp;
uint32_t iprob = prob*0xFFFFFFFF;
interest.setAuthValidityProb( iprob );
}
else
{
// if it's in the negative cache then we validate
// its signature manually
tracers::edge->bloom_lookup( auth, s_edge_bloom_delay );
delay += s_edge_bloom_delay;
if( m_negative_cache.contains( auth ) )
{
// we simulate verification delay by incrementing
// the processing delay
tracers::edge->sigverif( auth, s_edge_signature_delay );
delay += EdgeStrategy::s_edge_signature_delay;
if( auth.getSignature().getValue().value_size() > 0
&& auth.getSignature().getValue().value()[0] != 0 )
{
// if signature is valid then set auth validity
// and put auth into positive cache
interest.setAuthValidityProb( 0xFFFFFFFF );
tracers::edge->auth_cached
( auth, tracers::CachedPositiveMoved );
m_positive_cache.insert( auth );
}
else
{
// otherwise we drop the interest
onInterestDropped( interest, face, "negative cache, manual validation failed" );
return false;
}
}
else
{
// if the auth isn't in either cache then
// we set validity probability to 0
interest.setAuthValidityProb( 0 );
}
}
return RouterStrategy::filterOutgoingInterest( face, interest,
delay );
}