Added interface to make the PDCP notify the RRC of integrity check

failures.

lib/include/srsran/interfaces/enb_rrc_interfaces.h

@@ -117,6 +117,7 @@ class rrc_interface_pdcp
 {
 public:
   virtual void write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t pdu) = 0;
+  virtual void notify_pdcp_integrity_error(uint16_t rnti, uint32_t lcid)                 = 0;
 };
 
 } // namespace srsenb

lib/include/srsran/interfaces/gnb_interfaces.h

@@ -159,6 +159,7 @@ class rrc_interface_pdcp_nr
 {
 public:
   virtual void write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t pdu) = 0;
+  virtual void notify_pdcp_integrity_error(uint16_t rnti, uint32_t lcid)                 = 0;
 };
 
 class phy_interface_stack_nr

lib/include/srsran/interfaces/ue_rrc_interfaces.h

@@ -84,6 +84,7 @@ public:
   virtual void        write_pdu_bcch_dlsch(srsran::unique_byte_buffer_t pdu)         = 0;
   virtual void        write_pdu_pcch(srsran::unique_byte_buffer_t pdu)               = 0;
   virtual void        write_pdu_mch(uint32_t lcid, srsran::unique_byte_buffer_t pdu) = 0;
+  virtual void        notify_pdcp_integrity_error(uint32_t lcid)                     = 0;
   virtual const char* get_rb_name(uint32_t lcid)                                     = 0;
 };
 

lib/src/upper/pdcp_entity_lte.cc

@@ -301,8 +301,10 @@ void pdcp_entity_lte::handle_srb_pdu(srsran::unique_byte_buffer_t pdu)
 
   // Perfrom integrity checks
   if (integrity_direction == DIRECTION_RX || integrity_direction == DIRECTION_TXRX) {
-    if (not integrity_verify(pdu->msg, pdu->N_bytes, count, mac)) {
+    bool pdu_valid = integrity_verify(pdu->msg, pdu->N_bytes, count, mac);
+    if (not pdu_valid) {
       logger.error(pdu->msg, pdu->N_bytes, "%s Dropping PDU", rrc->get_rb_name(lcid));
+      rrc->notify_pdcp_integrity_error(lcid);
       return; // Discard
     }
   }
@@ -763,7 +765,8 @@ void pdcp_entity_lte::notify_failure(const pdcp_sn_vector_t& pdcp_sns)
  ***************************************************************************/
 bool pdcp_entity_lte::check_valid_config()
 {
-  if (cfg.sn_len != PDCP_SN_LEN_5 && cfg.sn_len != PDCP_SN_LEN_7 && cfg.sn_len != PDCP_SN_LEN_12 && cfg.sn_len != PDCP_SN_LEN_18) {
+  if (cfg.sn_len != PDCP_SN_LEN_5 && cfg.sn_len != PDCP_SN_LEN_7 && cfg.sn_len != PDCP_SN_LEN_12 &&
+      cfg.sn_len != PDCP_SN_LEN_18) {
     logger.error("Trying to configure bearer with invalid SN LEN=%d", cfg.sn_len);
     return false;
   }

lib/test/upper/pdcp_base_test.h

@@ -75,6 +75,7 @@ public:
   void write_pdu_bcch_dlsch(srsran::unique_byte_buffer_t pdu) {}
   void write_pdu_pcch(srsran::unique_byte_buffer_t pdu) {}
   void write_pdu_mch(uint32_t lcid, srsran::unique_byte_buffer_t pdu) {}
+  void notify_pdcp_integrity_error(uint32_t lcid) {}
 
   const char* get_rb_name(uint32_t lcid) { return "None"; }
 

srsenb/hdr/stack/rrc/rrc.h

@@ -117,6 +117,7 @@ public:
 
   // rrc_interface_pdcp
   void write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t pdu) override;
+  void notify_pdcp_integrity_error(uint16_t rnti, uint32_t lcid) override;
 
   uint32_t get_nof_users();
 

srsenb/hdr/stack/rrc/rrc_nr.h

@@ -90,8 +90,10 @@ public:
   void        max_retx_attempted(uint16_t rnti) {}
   void        protocol_failure(uint16_t rnti) {}
   const char* get_rb_name(uint32_t lcid) { return "invalid"; }
+
   // PDCP interface
   void write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t pdu) final;
+  void notify_pdcp_integrity_error(uint16_t rnti, uint32_t lcid) final;
 
   class ue
   {
@@ -155,4 +157,4 @@ private:
 
 } // namespace srsenb
 
-#endif // SRSENB_RRC_NR_H
+#endif // SRSENB_RRC_NR_H

srsenb/hdr/stack/upper/pdcp.h

@@ -99,6 +99,7 @@ private:
     void        write_pdu_bcch_dlsch(srsran::unique_byte_buffer_t pdu);
     void        write_pdu_pcch(srsran::unique_byte_buffer_t pdu);
     void        write_pdu_mch(uint32_t lcid, srsran::unique_byte_buffer_t pdu) {}
+    void        notify_pdcp_integrity_error(uint32_t lcid);
     const char* get_rb_name(uint32_t lcid);
   };
 

srsenb/hdr/stack/upper/pdcp_nr.h

@@ -87,6 +87,7 @@ private:
     void        write_pdu_bcch_dlsch(srsran::unique_byte_buffer_t pdu) final;
     void        write_pdu_pcch(srsran::unique_byte_buffer_t pdu) final;
     void        write_pdu_mch(uint32_t lcid, srsran::unique_byte_buffer_t pdu) final {}
+    void        notify_pdcp_integrity_error(uint32_t lcid) final {}
     const char* get_rb_name(uint32_t lcid) final;
   };
 

srsenb/src/stack/rrc/rrc.cc

@@ -290,6 +290,11 @@ void rrc::write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t p
   }
 }
 
+void rrc::notify_pdcp_integrity_error(uint16_t rnti, uint32_t lcid)
+{
+  logger.warning("Received Integrity Protection failured indication, rnti=0x%u, lcid=%u", rnti, lcid);
+}
+
 /*******************************************************************************
   S1AP interface
 *******************************************************************************/

srsenb/src/stack/rrc/rrc_nr.cc

@@ -344,6 +344,8 @@ void rrc_nr::write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_
   handle_pdu(rnti, lcid, std::move(pdu));
 }
 
+void rrc_nr::notify_pdcp_integrity_error(uint16_t rnti, uint32_t lcid) {}
+
 /*******************************************************************************
   UE class
 

srsenb/src/stack/upper/pdcp.cc

@@ -220,6 +220,11 @@ void pdcp::user_interface_rrc::write_pdu(uint32_t lcid, srsran::unique_byte_buff
   rrc->write_pdu(rnti, lcid, std::move(pdu));
 }
 
+void pdcp::user_interface_rrc::notify_pdcp_integrity_error(uint32_t lcid)
+{
+  rrc->notify_pdcp_integrity_error(rnti, lcid);
+}
+
 void pdcp::user_interface_rrc::write_pdu_bcch_bch(srsran::unique_byte_buffer_t pdu)
 {
   ERROR("Error: Received BCCH from ue=%d", rnti);

srsue/hdr/stack/rrc/rrc.h

@@ -147,6 +147,7 @@ public:
   void write_pdu_bcch_dlsch(srsran::unique_byte_buffer_t pdu);
   void write_pdu_pcch(srsran::unique_byte_buffer_t pdu);
   void write_pdu_mch(uint32_t lcid, srsran::unique_byte_buffer_t pdu);
+  void notify_pdcp_integrity_error(uint32_t lcid);
 
   bool srbs_flushed(); //< Check if data on SRBs still needs to be sent
 

srsue/hdr/stack/rrc/rrc_nr.h

@@ -16,12 +16,12 @@
 #include "srsran/asn1/rrc_nr.h"
 #include "srsran/asn1/rrc_nr_utils.h"
 #include "srsran/common/block_queue.h"
-#include "srsran/common/common_nr.h"
 #include "srsran/common/buffer_pool.h"
+#include "srsran/common/common_nr.h"
 #include "srsran/common/stack_procedure.h"
 #include "srsran/common/task_scheduler.h"
-#include "srsran/interfaces/ue_rrc_interfaces.h"
 #include "srsran/interfaces/ue_nr_interfaces.h"
+#include "srsran/interfaces/ue_rrc_interfaces.h"
 #include "srsue/hdr/stack/upper/gw.h"
 
 namespace srsue {
@@ -115,6 +115,7 @@ public:
   void write_pdu_bcch_dlsch(srsran::unique_byte_buffer_t pdu) final;
   void write_pdu_pcch(srsran::unique_byte_buffer_t pdu) final;
   void write_pdu_mch(uint32_t lcid, srsran::unique_byte_buffer_t pdu) final;
+  void notify_pdcp_integrity_error(uint32_t lcid) final;
 
   // RRC (LTE) interface
   void get_eutra_nr_capabilities(srsran::byte_buffer_t* eutra_nr_caps);
@@ -246,4 +247,4 @@ private:
 
 } // namespace srsue
 
-#endif // SRSUE_RRC_NR_H
+#endif // SRSUE_RRC_NR_H

srsue/src/stack/rrc/rrc.cc

@@ -1620,6 +1620,11 @@ void rrc::write_pdu(uint32_t lcid, unique_byte_buffer_t pdu)
   process_pdu(lcid, std::move(pdu));
 }
 
+void rrc::notify_pdcp_integrity_error(uint32_t lcid)
+{
+  logger.warning("Received Integrity Protection failured indication, rnti=0x%u, lcid=%u", lcid);
+}
+
 void rrc::process_pdu(uint32_t lcid, srsran::unique_byte_buffer_t pdu)
 {
   logger.debug("RX PDU, LCID: %d", lcid);

srsue/src/stack/rrc/rrc_nr.cc

@@ -206,6 +206,7 @@ void rrc_nr::write_pdu_bcch_bch(srsran::unique_byte_buffer_t pdu) {}
 void rrc_nr::write_pdu_bcch_dlsch(srsran::unique_byte_buffer_t pdu) {}
 void rrc_nr::write_pdu_pcch(srsran::unique_byte_buffer_t pdu) {}
 void rrc_nr::write_pdu_mch(uint32_t lcid, srsran::unique_byte_buffer_t pdu) {}
+void rrc_nr::notify_pdcp_integrity_error(uint32_t lcid) {}
 
 void rrc_nr::get_eutra_nr_capabilities(srsran::byte_buffer_t* eutra_nr_caps_pdu)
 {

srsue/test/ttcn3/hdr/ttcn3_syssim.h

@@ -150,6 +150,7 @@ public:
 
   // RRC interface for PDCP, PDCP calls RRC to push RRC SDU
   void write_pdu(uint32_t lcid, unique_byte_buffer_t pdu);
+  void notify_pdcp_integrity_error(uint32_t lcid);
 
   // Not supported right now
   void write_pdu_bcch_bch(unique_byte_buffer_t pdu);

srsue/test/ttcn3/src/ttcn3_syssim.cc

@@ -1139,6 +1139,11 @@ void ttcn3_syssim::protocol_failure()
   logger.error("%s not implemented.", __FUNCTION__);
 }
 
+void ttcn3_syssim::notify_pdcp_integrity_error(uint32_t lcid)
+{
+  logger.error("%s not implemented.", __FUNCTION__);
+}
+
 const char* ttcn3_syssim::get_rb_name(uint32_t lcid)
 {
   if (lcid < rb_id_vec.size()) {

srsue/test/upper/nas_test.cc

@@ -74,6 +74,7 @@ public:
   const char* get_rb_name(uint32_t lcid) { return "lcid"; }
   void        write_sdu(uint32_t lcid, srsran::unique_byte_buffer_t sdu) {}
   bool        is_lcid_enabled(uint32_t lcid) { return false; }
+  void        notify_pdcp_integrity_error(uint32_t lcid) {}
 };
 
 class rrc_dummy : public rrc_interface_nas