Added PDCP_SN_LEN constants. Added bearer_id and direction back to the pdcp_entity_base.

lib/include/srslte/common/interfaces_common.h

@@ -92,19 +92,14 @@ public:
   // bool do_rohc;
 };
 
-enum class srslte_nr_sn_len_t {
-  SN_12 = 12,
-  SN_18 = 18
-};
+const uint8_t PDCP_SN_LEN_5  = 5;
+const uint8_t PDCP_SN_LEN_12 = 12;
+const uint8_t PDCP_SN_LEN_18 = 18;
 
 class srslte_pdcp_config_nr_t
 {
 public:
-  srslte_pdcp_config_nr_t(uint8_t            bearer_id_  = 0,
-                          bool               is_control_ = false,
-                          bool               is_data_    = false,
-                          uint8_t            direction_  = SECURITY_DIRECTION_UPLINK,
-                          srslte_nr_sn_len_t sn_len_     = srslte_nr_sn_len_t::SN_12) :
+  srslte_pdcp_config_nr_t(uint8_t bearer_id_, bool is_control_, bool is_data_, uint8_t direction_, uint8_t sn_len_) :
     bearer_id(bearer_id_),
     direction(direction_),
     is_control(is_control_),
@@ -113,11 +108,11 @@ public:
   {
   }
 
-  uint32_t           bearer_id;
-  uint8_t            direction;
-  bool               is_control;
-  bool               is_data;
-  srslte_nr_sn_len_t sn_len;
+  uint32_t bearer_id;
+  uint8_t  direction;
+  bool     is_control;
+  bool     is_data;
+  uint8_t  sn_len;
 };
 
 class mac_interface_timers

lib/include/srslte/upper/pdcp_entity_base.h

@@ -87,13 +87,15 @@ public:
  
 protected:
   byte_buffer_pool* pool = byte_buffer_pool::get_instance();
-  srslte::log*      log  = nullptr;
+  srslte::log*      log  = nullptr;  
 
   bool     active        = false;
   uint32_t lcid          = 0;
   bool     rb_is_control = false;
   bool     do_integrity  = false;
   bool     do_encryption = false;
+  uint32_t bearer_id     = 0; 
+  uint32_t direction     = 0; 
 
   uint8_t sn_len       = 0;
   uint8_t sn_len_bytes = 0;
@@ -108,15 +110,10 @@ protected:
   CIPHERING_ALGORITHM_ID_ENUM cipher_algo = CIPHERING_ALGORITHM_ID_EEA0;
   INTEGRITY_ALGORITHM_ID_ENUM integ_algo  = INTEGRITY_ALGORITHM_ID_EIA0;
 
-
-  void integrity_generate(
-      uint8_t* msg, uint32_t msg_len, uint32_t count, uint32_t bearer_id, uint32_t direction, uint8_t* mac);
-  bool integrity_verify(
-      uint8_t* msg, uint32_t msg_len, uint32_t count, uint32_t bearer_id, uint32_t direction, uint8_t* mac);
-  void
-  cipher_encrypt(uint8_t* msg, uint32_t msg_len, uint32_t count, uint32_t bearer_id, uint32_t direction, uint8_t* ct);
-  void
-  cipher_decrypt(uint8_t* ct, uint32_t ct_len, uint32_t count, uint32_t bearer_id, uint32_t direction, uint8_t* msg);
+  void integrity_generate(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* mac);
+  bool integrity_verify(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* mac);
+  void cipher_encrypt(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* ct);
+  void cipher_decrypt(uint8_t* ct, uint32_t ct_len, uint32_t count, uint8_t* msg);
 };
 
 inline uint32_t pdcp_entity_base::HFN(uint32_t count)

lib/include/srslte/upper/pdcp_entity_nr.h

@@ -72,7 +72,7 @@ private:
   srsue::rrc_interface_pdcp* rrc = nullptr;
   srsue::gw_interface_pdcp*  gw  = nullptr;
 
-  srslte_pdcp_config_nr_t cfg;
+  srslte_pdcp_config_nr_t cfg = {0, false, false, 0, PDCP_SN_LEN_12};
 
   uint16_t sn_len_bytes = 0;
 
@@ -84,6 +84,9 @@ private:
 
   // Constants: 3GPP TS 38.323 v15.2.0, section 7.2
   uint32_t window_size = 0;
+
+  // Packing/Unpacking Helper functions
+  uint32_t get_rcvd_sn(const unique_byte_buffer_t& pdu);
 };
 
 } // namespace srslte

lib/src/upper/pdcp_entity_base.cc

@@ -53,8 +53,7 @@ void pdcp_entity_base::config_security(uint8_t*                    k_rrc_enc_,
 /****************************************************************************
  * Security functions
  ***************************************************************************/
-void pdcp_entity_base::integrity_generate(
-    uint8_t* msg, uint32_t msg_len, uint32_t count, uint32_t bearer_id, uint32_t direction, uint8_t* mac)
+void pdcp_entity_base::integrity_generate(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* mac)
 {
   uint8_t *k_int;
 
@@ -99,8 +98,7 @@ void pdcp_entity_base::integrity_generate(
   log->debug_hex(msg, msg_len, "  Message");
 }
 
-bool pdcp_entity_base::integrity_verify(
-    uint8_t* msg, uint32_t msg_len, uint32_t count, uint32_t bearer_id, uint32_t direction, uint8_t* mac)
+bool pdcp_entity_base::integrity_verify(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* mac)
 {
   uint8_t mac_exp[4] = {};
   bool is_valid = true;
@@ -163,8 +161,7 @@ bool pdcp_entity_base::integrity_verify(
   return is_valid;
 }
 
-void pdcp_entity_base::cipher_encrypt(
-    uint8_t* msg, uint32_t msg_len, uint32_t count, uint32_t bearer_id, uint32_t direction, uint8_t* ct)
+void pdcp_entity_base::cipher_encrypt(uint8_t* msg, uint32_t msg_len, uint32_t count, uint8_t* ct)
 {
   byte_buffer_t ct_tmp;
   uint8_t *k_enc;
@@ -197,8 +194,7 @@ void pdcp_entity_base::cipher_encrypt(
   }
 }
 
-void pdcp_entity_base::cipher_decrypt(
-    uint8_t* ct, uint32_t ct_len, uint32_t count, uint32_t bearer_id, uint32_t direction, uint8_t* msg)
+void pdcp_entity_base::cipher_decrypt(uint8_t* ct, uint32_t ct_len, uint32_t count, uint8_t* msg)
 {
   byte_buffer_t msg_tmp;
   uint8_t *k_enc;

lib/src/upper/pdcp_entity_lte.cc

@@ -122,7 +122,7 @@ void pdcp_entity_lte::write_sdu(unique_byte_buffer_t sdu, bool blocking)
     pdcp_pack_control_pdu(tx_count, sdu.get());
     if (do_integrity) {
       integrity_generate(
-          sdu->msg, sdu->N_bytes - 4, tx_count, cfg.bearer_id, cfg.direction, &sdu->msg[sdu->N_bytes - 4]);
+          sdu->msg, sdu->N_bytes - 4, tx_count, &sdu->msg[sdu->N_bytes - 4]);
     }
   }
 
@@ -135,12 +135,7 @@ void pdcp_entity_lte::write_sdu(unique_byte_buffer_t sdu, bool blocking)
   }
 
   if (do_encryption) {
-    cipher_encrypt(&sdu->msg[sn_len_bytes],
-                   sdu->N_bytes - sn_len_bytes,
-                   tx_count,
-                   cfg.bearer_id,
-                   cfg.direction,
-                   &sdu->msg[sn_len_bytes]);
+    cipher_encrypt(&sdu->msg[sn_len_bytes], sdu->N_bytes - sn_len_bytes, tx_count, &sdu->msg[sn_len_bytes]);
     log->info_hex(sdu->msg, sdu->N_bytes, "TX %s SDU (encrypted)", rrc->get_rb_name(lcid).c_str());
   }
   tx_count++;
@@ -181,18 +176,13 @@ void pdcp_entity_lte::write_pdu(unique_byte_buffer_t pdu)
     if (cfg.is_control) {
       uint32_t sn = *pdu->msg & 0x1F;
       if (do_encryption) {
-        cipher_decrypt(&pdu->msg[sn_len_bytes],
-                       pdu->N_bytes - sn_len_bytes,
-                       sn,
-                       cfg.bearer_id,
-                       cfg.direction,
-                       &(pdu->msg[sn_len_bytes]));
+        cipher_decrypt(&pdu->msg[sn_len_bytes], pdu->N_bytes - sn_len_bytes, sn, &(pdu->msg[sn_len_bytes]));
         log->info_hex(pdu->msg, pdu->N_bytes, "RX %s PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
       }
 
       if (do_integrity) {
         if (not integrity_verify(
-                pdu->msg, pdu->N_bytes - 4, sn, cfg.bearer_id, cfg.direction, &(pdu->msg[pdu->N_bytes - 4]))) {
+                pdu->msg, pdu->N_bytes - 4, sn, &(pdu->msg[pdu->N_bytes - 4]))) {
           log->error_hex(pdu->msg, pdu->N_bytes, "%s Dropping PDU", rrc->get_rb_name(lcid).c_str());
           goto exit;
         }
@@ -229,7 +219,7 @@ void pdcp_entity_lte::handle_um_drb_pdu(const srslte::unique_byte_buffer_t &pdu)
 
   uint32_t count = (rx_hfn << cfg.sn_len) | sn;
   if (do_encryption) {
-    cipher_decrypt(pdu->msg, pdu->N_bytes, count, cfg.bearer_id, cfg.direction, pdu->msg);
+    cipher_decrypt(pdu->msg, pdu->N_bytes, count, pdu->msg);
     log->debug_hex(pdu->msg, pdu->N_bytes, "RX %s PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
   }
 
@@ -291,7 +281,7 @@ void pdcp_entity_lte::handle_am_drb_pdu(const srslte::unique_byte_buffer_t &pdu)
   }
 
   // FIXME Check if PDU is not due to re-establishment of lower layers?
-  cipher_decrypt(pdu->msg, pdu->N_bytes, count, cfg.bearer_id, cfg.direction, pdu->msg);
+  cipher_decrypt(pdu->msg, pdu->N_bytes, count, pdu->msg);
   log->debug_hex(pdu->msg, pdu->N_bytes, "RX %s PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
 
   if (!discard) {

lib/src/upper/pdcp_entity_nr.cc

@@ -73,7 +73,13 @@ void pdcp_entity_nr::write_sdu(unique_byte_buffer_t sdu, bool blocking)
         rrc->get_rb_name(lcid).c_str(),
         (do_integrity) ? "true" : "false", (do_encryption) ? "true" : "false");
 
-  // TODO
+  // Start discard timer TODO
+
+  //
+  uint32_t count = tx_next;
+
+  //integrity_generate(sdu);
+
   
 }
 
@@ -106,13 +112,14 @@ void pdcp_entity_nr::write_pdu(unique_byte_buffer_t pdu)
   rcvd_count = COUNT(rcvd_hfn, rcvd_sn);
 
   // Integrity check
-  bool is_valid = integrity_check(pdu);
+  uint8_t mac[4];
+  bool is_valid = integrity_verify(pdu->msg, pdu->N_bytes, rcvd_count, mac);
   if (!is_valid) {
     return; // Invalid packet, drop.
   }
 
   // Decripting
-  cipher_decript(pdu);
+  cipher_decrypt(pdu->msg, pdu->N_bytes, rcvd_count, pdu->msg);
 
   // Check valid rcvd_count
   if (rcvd_count < rx_deliv /*|| check_received_before() TODO*/) {
@@ -129,12 +136,27 @@ void pdcp_entity_nr::write_pdu(unique_byte_buffer_t pdu)
   
   // Deliver to upper layers (TODO support in order delivery)
   if (is_control()) {
-    rrc->write_pdu(pdu);
+    rrc->write_pdu(lcid, std::move(pdu));
   } else {
-    gw->write_pdu(pdu);
+    gw->write_pdu(lcid, std::move(pdu));
   }
   
   // Not clear how to update RX_DELIV without reception buffer (TODO) 
 
   // TODO handle reordering timers
 }
+
+uint32_t pdcp_entity_nr::get_rcvd_sn(const unique_byte_buffer_t& pdu)
+{
+  uint32_t rcvd_sn = 0;
+  switch (sn_len) {
+    case PDCP_SN_LEN_12:
+      pdu->msg;
+    case PDCP_SN_LEN_18:
+      pdu->msg;
+    default:
+      log->error("Cannot extract RCVD_SN, invalid SN length configured: %d\n", (int)sn_len);
+  }
+  return rcvd_sn;
+}
+} // namespace srslte