Minor changes to also nable MBMS TUN interfaces with S1

	ACKNOWLEDGEMENT:
 	1. This commit was developed at Vicomtech (https://www.vicomtech.org) under UE project CDN-X-ALL: "CDN edge-cloud computing for efficient cache and reliable streaming aCROSS Aggregated unicast-multicast LinkS"
 	2. Project funded by Fed4FIRE+ OC5 (https://www.fed4fire.eu)
Signed-off-by: Javier Morgade <javier.morgade@ieee.org>

openair2/LAYER2/PDCP_v10.1.0/pdcp.c

@@ -1344,9 +1344,10 @@ pdcp_mbms_run (
 //
   // IP/NAS -> PDCP traffic : TX, read the pkt from the upper layer buffer
   //  if (LINK_ENB_PDCP_TO_GTPV1U && ctxt_pP->enb_flag == ENB_FLAG_NO) {
-  if (!EPC_MODE_ENABLED || ctxt_pP->enb_flag == ENB_FLAG_NO ) {
+  //if (EPC_MODE_ENABLED || ctxt_pP->enb_flag == ENB_FLAG_NO ) {
+
     pdcp_fifo_read_input_mbms_sdus_fromtun(ctxt_pP);
-  }
+  //}
 
   // PDCP -> NAS/IP traffic: RX
 //  if (ctxt_pP->enb_flag) {
@@ -2300,14 +2301,25 @@ uint64_t pdcp_module_init( uint64_t pdcp_optmask ) {
     } else if(ENB_NAS_USE_TUN) {
       netlink_init_tun("enb",1);
       nas_config(1, 1, 1, "enb");
+      if(pdcp_optmask & ENB_NAS_USE_TUN_W_MBMS_BIT){
       	netlink_init_mbms_tun("enm",1);
       	nas_config_mbms(1, 2, 1, "enm"); 
+      	LOG_I(PDCP, "ENB pdcp will use mbms tun interface\n");
+      }
       LOG_I(PDCP, "ENB pdcp will use tun interface\n");
     } else {
       LOG_I(PDCP, "pdcp will use kernel modules\n");
       netlink_init();
     }
+  }else{
+         if(pdcp_optmask & ENB_NAS_USE_TUN_W_MBMS_BIT){
+             LOG_W(PDCP, "ENB pdcp will use tun interface for MBMS\n");
+            netlink_init_mbms_tun("enm",1);
+             nas_config_mbms_s1(1, 2, 1, "enm"); 
+         }else
+             LOG_E(PDCP, "ENB pdcp will not use tun interface\n");
    }
+
   return pdcp_params.optmask ;
 }
 

openair2/LAYER2/PDCP_v10.1.0/pdcp.h

@@ -62,6 +62,7 @@ typedef boolean_t (*pdcp_data_ind_func_t)( const protocol_ctxt_t *, const srb_fl
 /* UEs beyond that will be multiplexed on the same tun   */
 #define MAX_NUMBER_NETIF           16
 
+#define ENB_NAS_USE_TUN_W_MBMS_BIT      (1<< 10)
 #define PDCP_USE_NETLINK_BIT            (1<< 11)
 #define LINK_ENB_PDCP_TO_IP_DRIVER_BIT  (1<< 13)
 #define LINK_ENB_PDCP_TO_GTPV1U_BIT     (1<< 14)

openair2/RRC/NAS/nas_config.c

@@ -269,6 +269,48 @@ int nas_config_mbms(int interface_id, int thirdOctet, int fourthOctet, char *ifn
   return returnValue;
 }
 
+int nas_config_mbms_s1(int interface_id, int thirdOctet, int fourthOctet, char *ifname) {
+  //char buf[5];
+  char ipAddress[20];
+  char broadcastAddress[20];
+  char interfaceName[20];
+  int returnValue;
+  //if(strcmp(ifname,"ue") == 0)
+       //sprintf(ipAddress, "%s.%d.%d", "20.0",thirdOctet,fourthOctet);
+  ////else
+       sprintf(ipAddress, "%s.%d.%d","10.0",thirdOctet,fourthOctet);
+
+  sprintf(broadcastAddress, "%s.%d.255","10.0", thirdOctet);
+  sprintf(interfaceName, "%s%s%d", "oaitun_",ifname,interface_id);
+  bringInterfaceUp(interfaceName, 0);
+  // sets the machine address
+  returnValue= setInterfaceParameter(interfaceName, ipAddress,SIOCSIFADDR);
+
+  // sets the machine network mask
+  if(!returnValue)
+    returnValue= setInterfaceParameter(interfaceName, "255.255.255.0",SIOCSIFNETMASK);
+  printf("returnValue %d\n",returnValue);
+
+  // sets the machine broadcast address
+  if(!returnValue)
+    returnValue= setInterfaceParameter(interfaceName, broadcastAddress,SIOCSIFBRDADDR);
+  printf("returnValue %d\n",returnValue);
+
+  if(!returnValue)
+    bringInterfaceUp(interfaceName, 1);
+  printf("returnValue %d\n",returnValue);
+
+  if(!returnValue)
+    LOG_I(OIP,"Interface %s successfuly configured, ip address %s, mask %s broadcast address %s\n",
+          interfaceName, ipAddress, "255.255.255.0", broadcastAddress);
+  else
+    LOG_E(OIP,"Interface %s couldn't be configured (ip address %s, mask %s broadcast address %s)\n",
+          interfaceName, ipAddress, "255.255.255.0", broadcastAddress);
+
+  return returnValue;
+}
+
+
 // non blocking full configuration of the interface (address, and the two lest octets of the address)
 int nas_config(int interface_id, int thirdOctet, int fourthOctet, char *ifname) {
   //char buf[5];

openair2/RRC/NAS/nas_config.h

@@ -76,6 +76,20 @@ int nas_config(int interface_id, int thirdOctet, int fourthOctet, char *ifsuffix
  */
 int nas_config_mbms(int interface_id, int thirdOctet, int fourthOctet, char *ifsuffix);
 
+/*! \fn int  nas_config_mbms_s1(char*, int, int)
+ * \brief This function initializes the nasmesh interface using the basic values,
+ * basic address, network mask and broadcast address, as the default configured
+ * ones
+ * \param[in] interfaceName, the name of the interface, e.g. nasmesh0 or nasmesh1
+ * \param[in] third octet of the ip address e.g. for the 10.1.2.3 address would be 2
+ * \param[in] fourth octet of the ip address e.g. for the 10.1.2.3 address would be 3
+ * \return 0 on success, otherwise 1, if couldn't open a socket and 2 if the ioctl fails
+ * \note
+ * @ingroup  ?????
+ */
+int nas_config_mbms_s1(int interface_id, int thirdOctet, int fourthOctet, char *ifsuffix);
+
+
 
 /*! \fn int  blocking_NAS_config(char*, char*, char*, char*)
  * \brief This function initializes the nasmesh interface, in a blocking way,

targets/RT/USER/lte-softmodem.c

@@ -496,6 +496,8 @@ void init_pdcp(void) {
     if (IS_SOFTMODEM_NOS1)
       pdcp_initmask = pdcp_initmask | ENB_NAS_USE_TUN_BIT | SOFTMODEM_NOKRNMOD_BIT  ;
 
+    pdcp_initmask = pdcp_initmask | ENB_NAS_USE_TUN_W_MBMS_BIT;
+
     pdcp_module_init(pdcp_initmask);
 
     if (NODE_IS_CU(RC.rrc[0]->node_type)) {