NR SDAP gNB - Transparent Mode

cmake_targets/CMakeLists.txt

@@ -1983,6 +1983,10 @@ set(NR_PDCP_SRC
   ${OPENAIR2_DIR}/LAYER2/nr_pdcp/asn1_utils.c
   )
 
+set(NR_SDAP_SRC
+  ${OPENAIR2_DIR}/SDAP/nr_sdap/nr_sdap_gnb.c
+  )
+  
 set(L2_SRC
   ${PDCP_DIR}/pdcp.c
   ${PDCP_DIR}/pdcp_fifo.c
@@ -2026,6 +2030,7 @@ set(L2_LTE_SRC
 set(L2_NR_SRC
   ${NR_RLC_SRC}
   ${NR_PDCP_SRC}
+  ${NR_SDAP_SRC}
   ${NR_RRC_DIR}/rrc_gNB.c
   ${NR_RRC_DIR}/nr_rrc_common.c
   ${NR_RRC_DIR}/L2_nr_interface.c
@@ -2061,6 +2066,7 @@ set(L2_RRC_SRC_UE
 set(NR_L2_SRC_UE
   ${NR_RLC_SRC}
   ${NR_PDCP_SRC}
+  ${NR_SDAP_SRC}
   ${NR_UE_RRC_DIR}/L2_interface_ue.c
   ${NR_UE_RRC_DIR}/main_ue.c
   ${NR_UE_RRC_DIR}/rrc_UE.c

openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c

@@ -36,6 +36,7 @@
 #include "pdcp.h"
 #include "LAYER2/nr_rlc/nr_rlc_oai_api.h"
 #include <openair3/ocp-gtpu/gtp_itf.h>
+#include "openair2/SDAP/nr_sdap/nr_sdap_gnb.h"
 
 #define TODO do { \
     printf("%s:%d:%s: todo\n", __FILE__, __LINE__, __FUNCTION__); \
@@ -480,7 +481,10 @@ static void deliver_sdu_drb(void *_ue, nr_pdcp_entity_t *entity,
       GTPV1U_GNB_TUNNEL_DATA_REQ(message_p).offset              = GTPU_HEADER_OVERHEAD_MAX;
       GTPV1U_GNB_TUNNEL_DATA_REQ(message_p).rnti                = ue->rnti;
       GTPV1U_GNB_TUNNEL_DATA_REQ(message_p).pdusession_id       = entity->pdusession_id;
-      if (offset==1) LOG_I(PDCP, "%s() (drb %d) SDAP header %2x\n",__func__, rb_id, buf[0]);
+      if (offset==1) {
+        LOG_I(PDCP, "%s() (drb %d) SDAP header %2x\n",__func__, rb_id, buf[0]);
+        sdap_gnb_ul_header_handler(buf[0]); // Handler for the UL gNB SDAP Header
+      }
       LOG_D(PDCP, "%s() (drb %d) sending message to gtp size %d\n", __func__, rb_id, size-offset);
       itti_send_msg_to_task(TASK_VARIABLE, INSTANCE_DEFAULT, message_p);
    }

openair2/SDAP/nr_sdap/nr_sdap_gnb.c

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#include "nr_sdap_gnb.h"
+#include <openair2/LAYER2/PDCP_v10.1.0/pdcp.h>
+
+boolean_t sdap_gnb_data_req(protocol_ctxt_t *ctxt_p,
+                            const srb_flag_t srb_flag,
+                            const rb_id_t rb_id,
+                            const mui_t mui,
+                            const confirm_t confirm,
+                            const sdu_size_t sdu_buffer_size,
+                            unsigned char *const sdu_buffer,
+                            const pdcp_transmission_mode_t pt_mode,
+                            const uint32_t *sourceL2Id,
+                            const uint32_t *destinationL2Id
+                           ) {
+  if(sdu_buffer == NULL) {
+    LOG_E(PDCP, "%s:%d:%s: SDAP Layer gNB - NULL sdu_buffer \n", __FILE__, __LINE__, __FUNCTION__);
+    exit(1);
+  }
+
+  if(sdu_buffer_size == 0) {
+    LOG_E(PDCP, "%s:%d:%s: SDAP Layer gNB - NULL or 0 sdu_buffer_size \n", __FILE__, __LINE__, __FUNCTION__);
+    exit(1);
+  }
+
+  uint8_t *sdap_buf = (uint8_t *)malloc(sdu_buffer_size+SDAP_HDR_LENGTH);
+  nr_sdap_dl_hdr_t sdap_hdr;
+  sdap_hdr.RDI = 0; // SDAP_Hardcoded -
+  sdap_hdr.RQI = 0; // SDAP_Hardcoded - Should get this info from DL_PDU_SESSION_INFORMATION
+  sdap_hdr.QFI = 1; // SDAP_Hardcoded - Should get this info from DL_PDU_SESSION_INFORMATION
+  memcpy(&sdap_buf[0], &sdap_hdr, 1);
+  memcpy(&sdap_buf[1], sdu_buffer, sdu_buffer_size);
+  rb_id_t sdap_drb_id = rb_id; // SDAP_Hardcoded - Should get this info from QFI to DRB mapping table
+  boolean_t ret = pdcp_data_req(ctxt_p,
+                                srb_flag,
+                                sdap_drb_id,
+                                mui,
+                                confirm,
+                                sdu_buffer_size+1,
+                                sdap_buf,
+                                pt_mode,
+                                sourceL2Id,
+                                destinationL2Id);
+
+  if(!ret) {
+    LOG_E(PDCP, "%s:%d:%s: SDAP Layer gNB - PDCP DL refused PDU\n", __FILE__, __LINE__, __FUNCTION__);
+    free(sdap_buf);
+    return 0;
+  }
+
+  free(sdap_buf);
+  return 1;
+}
+
+void sdap_gnb_ul_header_handler(char sdap_gnb_ul_hdr) {
+  nr_sdap_ul_hdr_t *sdap_hdr_ul = (nr_sdap_ul_hdr_t *)&sdap_gnb_ul_hdr;
+
+  switch (sdap_hdr_ul->DC) {
+    case SDAP_HDR_UL_DATA_PDU:
+      LOG_I(PDCP, "%s:%d:%s: SDAP Layer gNB - UL Received SDAP Data PDU\n", __FILE__, __LINE__, __FUNCTION__);
+      break;
+
+    case SDAP_HDR_UL_CTRL_PDU:
+      LOG_I(PDCP, "%s:%d:%s: SDAP Layer gNB - Received SDAP Control PDU\n", __FILE__, __LINE__, __FUNCTION__);
+      break;
+  }
+}
\ No newline at end of file

openair2/SDAP/nr_sdap/nr_sdap_gnb.h

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#ifndef _NR_SDAP_GNB_
+#define _NR_SDAP_GNB_
+
+#include "openair2/COMMON/platform_types.h"
+#include "common/utils/LOG/log.h"
+
+#define SDAP_BITMASK_DC         (0x80)
+#define SDAP_BITMASK_R          (0x40)
+#define SDAP_BITMASK_QFI        (0x3F)
+#define SDAP_HDR_UL_DATA_PDU    (1)
+#define SDAP_HDR_UL_CTRL_PDU    (0)
+#define SDAP_HDR_LENGTH         (1)
+
+typedef struct nr_sdap_dl_hdr_s {
+  uint8_t QFI:6;
+  uint8_t RQI:1;
+  uint8_t RDI:1;
+} __attribute__((packed)) nr_sdap_dl_hdr_t;
+
+typedef struct nr_sdap_ul_hdr_s {
+  uint8_t QFI:6;
+  uint8_t R:1;
+  uint8_t DC:1;
+} __attribute__((packed)) nr_sdap_ul_hdr_t;
+
+boolean_t sdap_gnb_data_req(protocol_ctxt_t *ctxt_p,
+                            const srb_flag_t srb_flag,
+                            const rb_id_t rb_id,
+                            const mui_t mui,
+                            const confirm_t confirm,
+                            const sdu_size_t sdu_buffer_size,
+                            unsigned char *const sdu_buffer,
+                            const pdcp_transmission_mode_t pt_mode,
+                            const uint32_t *sourceL2Id,
+                            const uint32_t *destinationL2Id
+                           );
+
+void sdap_gnb_ul_header_handler(char sdap_gnb_ul_hdr);
+
+#endif
\ No newline at end of file

openair3/ocp-gtpu/gtp_itf.cpp

@@ -17,6 +17,7 @@ extern "C" {
 #include <openair2/COMMON/gtpv1_u_messages_types.h>
 #include <openair3/ocp-gtpu/gtp_itf.h>
 #include <openair2/LAYER2/PDCP_v10.1.0/pdcp.h>
+#include "openair2/SDAP/nr_sdap/nr_sdap_gnb.h"
 //#include <openair1/PHY/phy_extern.h>
 
 #pragma pack(1)
@@ -532,7 +533,7 @@ int gtpv1u_create_ngu_tunnel(  const instance_t instance,
                                     create_tunnel_req->pdusession_id[i],
                                     create_tunnel_req->upf_NGu_teid[i],
                                     create_tunnel_req->upf_addr[i], 2152,
-                                    pdcp_data_req);
+                                    sdap_gnb_data_req);
     create_tunnel_resp->status=0;
     create_tunnel_resp->rnti=create_tunnel_req->rnti;
     create_tunnel_resp->num_tunnels=create_tunnel_req->num_tunnels;