srsue/rrctl: add Security Mode messages for EEA/EIA

srsue/hdr/stack/upper/rrctl.h

@@ -40,6 +40,7 @@ namespace proto {
     RRCTL_CONN_RELEASE,
     RRCTL_PAGING,
     RRCTL_PARAM,
+    RRCTL_SEC_MODE,
 
     /* RRCTL protocol extensions (0b11xxxx, up to 15 groups) follow */
 
@@ -114,10 +115,40 @@ namespace proto {
     } u;
   } __attribute__((packed));
 
+  enum msg_eea_type {
+    RRCTL_EEA0 = 0x00,
+    RRCTL_EEA1 = 0x01,
+    RRCTL_EEA2 = 0x02,
+    RRCTL_EEA3 = 0x03,
+  };
+
+  enum msg_eia_type {
+    RRCTL_EIA0 = 0x00,
+    RRCTL_EIA1 = 0x01,
+    RRCTL_EIA2 = 0x02,
+    RRCTL_EIA3 = 0x03,
+  };
+
+  #define SEC_MODE_F_RESET_RX_CTR (1 << 0)
+  #define SEC_MODE_F_RESET_TX_CTR (1 << 1)
+
+  struct msg_sec_mode_req {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+    uint8_t flags:2, eia:3, eea:3;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+    uint8_t eea:3, eia:3, flags:2;
+#else
+    #error "Please fix <asm/byteorder.h>"
+#endif
+    uint8_t spare[3];
+    uint8_t k_asme[0]; // optional (32 octets)
+  } __attribute__((packed));
+
   struct msg {
     struct msg_hdr hdr;
     union {
       struct msg_data data;
+      struct msg_sec_mode_req;
       struct msg_param_req param_req;
       struct msg_paging_ind paging_ind;
       struct msg_plmn_search_res plmn_search_res;

srsue/src/stack/upper/nas_ext.cc

@@ -83,6 +83,7 @@ void nas_ext::init(usim_interface_nas* usim_, rrc_interface_nas* rrc_, gw_interf
     case rrctl::proto::RRCTL_PARAM:
       handle_rrctl_param(disc, payload, length);
       break;
+    case rrctl::proto::RRCTL_SEC_MODE:
     case rrctl::proto::RRCTL_EXT_USIM:
     case rrctl::proto::RRCTL_CONN_RELEASE:
     default:

srsue/src/stack/upper/rrctl.cc

@@ -59,6 +59,9 @@ std::string msg_hdr_desc(proto::msg_type type, proto::msg_disc disc, uint16_t le
   case RRCTL_PARAM:
     desc += "Parameter";
     break;
+  case RRCTL_SEC_MODE:
+    desc += "Security Mode";
+    break;
   case RRCTL_EXT_USIM:
     desc += "(U)SIM Specific";
     break;