diff --git a/daemon/fw/forwarder.cpp b/daemon/fw/forwarder.cpp
index 5cb10de..ecdce2e 100644
--- a/daemon/fw/forwarder.cpp
+++ b/daemon/fw/forwarder.cpp
@@ -29,6 +29,8 @@
 #include "strategy.hpp"
 #include "table/cleanup.hpp"
 #include <ndn-cxx/lp/tags.hpp>
+#include "face/null-face.hpp"
+#include <boost/random/uniform_int_distribution.hpp>
 
 namespace nfd {
 
@@ -40,8 +42,10 @@
   , m_pit(m_nameTree)
   , m_measurements(m_nameTree)
   , m_strategyChoice(m_nameTree, fw::makeDefaultStrategy(*this))
+  , m_csFace(face::makeNullFace(FaceUri("contentstore://")))
 {
   fw::installStrategies(*this);
+  getFaceTable().addReserved(m_csFace, face::FACEID_CONTENT_STORE);
 
   m_faceTable.afterAdd.connect([this] (Face& face) {
     face.afterReceiveInterest.connect(
@@ -236,6 +240,10 @@
 {
   NFD_LOG_DEBUG("onContentStoreHit interest=" << interest.getName());
 
+  beforeSatisfyInterest(*pitEntry, *m_csFace, data);
+  this->dispatchToStrategy(*pitEntry,
+    [&] (fw::Strategy& strategy) { strategy.beforeSatisfyInterest(pitEntry, *m_csFace, data); });
+
   data.setTag(make_shared<lp::IncomingFaceIdTag>(face::FACEID_CONTENT_STORE));
   // XXX should we lookup PIT for other Interests that also match csMatch?
 
@@ -283,6 +291,7 @@
   NFD_LOG_DEBUG("onInterestUnsatisfied interest=" << pitEntry->getName());
 
   // invoke PIT unsatisfied callback
+  beforeExpirePendingInterest(*pitEntry);
   this->dispatchToStrategy(*pitEntry,
     [&] (fw::Strategy& strategy) { strategy.beforeExpirePendingInterest(pitEntry); });
 
@@ -354,6 +363,7 @@
     }
 
     // invoke PIT satisfy callback
+    beforeSatisfyInterest(*pitEntry, inFace, data);
     this->dispatchToStrategy(*pitEntry,
       [&] (fw::Strategy& strategy) { strategy.beforeSatisfyInterest(pitEntry, inFace, data); });
 
diff --git a/daemon/fw/forwarder.hpp b/daemon/fw/forwarder.hpp
index 8c6f1df..084c2af 100644
--- a/daemon/fw/forwarder.hpp
+++ b/daemon/fw/forwarder.hpp
@@ -182,6 +182,17 @@
     m_csFromNdnSim = cs;
   }
 
+public:
+  /** \brief trigger before PIT entry is satisfied
+   *  \sa Strategy::beforeSatisfyInterest
+   */
+  signal::Signal<Forwarder, pit::Entry, Face, Data> beforeSatisfyInterest;
+
+  /** \brief trigger before PIT entry expires
+   *  \sa Strategy::beforeExpirePendingInterest
+   */
+  signal::Signal<Forwarder, pit::Entry> beforeExpirePendingInterest;
+
 PUBLIC_WITH_TESTS_ELSE_PRIVATE: // pipelines
   /** \brief incoming Interest pipeline
    */
@@ -299,6 +310,7 @@
   StrategyChoice     m_strategyChoice;
   DeadNonceList      m_deadNonceList;
   NetworkRegionTable m_networkRegionTable;
+  shared_ptr<Face>   m_csFace;
 
   ns3::Ptr<ns3::ndn::ContentStore> m_csFromNdnSim;