1 /*****************************************************************************
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3 # Copyright 2019 AT&T Intellectual Property *
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4 # Copyright 2019 Nokia *
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6 # Licensed under the Apache License, Version 2.0 (the "License"); *
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7 # you may not use this file except in compliance with the License. *
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8 # You may obtain a copy of the License at *
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10 # http://www.apache.org/licenses/LICENSE-2.0 *
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12 # Unless required by applicable law or agreed to in writing, software *
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13 # distributed under the License is distributed on an "AS IS" BASIS, *
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14 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
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15 # See the License for the specific language governing permissions and *
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16 # limitations under the License. *
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18 ******************************************************************************/
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19 #include "e2ap_message_handler.hpp"
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21 void e2ap_handle_sctp_data(int &socket_fd, sctp_buffer_t &data)
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23 //decode the data into E2AP-PDU
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24 e2ap_pdu_t* pdu = new_e2ap_pdu();
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26 e2ap_decode_pdu(pdu, data.buffer, data.len);
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28 e2ap_print_pdu(pdu);
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30 int index = e2ap_get_index(pdu);
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31 int procedureCode = e2ap_get_procedureCode(pdu);
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33 LOG_I("[E2AP] Unpacked E2AP-PDU: index = %d, procedureCode = %d\n", index, procedureCode);
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35 switch(procedureCode)
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40 case 1: //initiatingMessage
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41 LOG_D("[E2AP] Received X2-SETUP-REQUEST");
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42 e2ap_handle_X2SetupRequest(pdu, socket_fd);
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45 case 2: //successfulOutcome
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46 LOG_D("[E2AP] Received X2-SETUP-RESPONSE");
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47 //e2ap_handle_X2SetupResponse(pdu, socket_fd);
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54 LOG_E("[E2AP] Invalid message index=%d in E2AP-PDU", index);
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59 case 36: //ENDCX2Setup
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62 case 1: //initiatingMessage
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63 LOG_D("[E2AP] Received ENDC-X2-SETUP-REQUEST");
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64 e2ap_handle_ENDCX2SetupRequest(pdu, socket_fd);
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67 case 2: //successfulOutcome
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68 LOG_D("[E2AP] Received ENDC-X2-SETUP-RESPONSE");
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69 //x2ap_handle_X2SetupResponse(pdu, socket_fd);
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73 LOG_D("[E2AP] Received ENDC-X2-SETUP-FAILURE");
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77 LOG_E("[E2AP] Invalid message index=%d in E2AP-PDU", index);
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82 case 201: //RIC SUBSCRIPTION
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85 case 1: //initiatingMessage
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86 LOG_D("[E2AP] Received RIC-SUBSCRIPTION-REQUEST");
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87 e2ap_handle_RICSubscriptionRequest(pdu, socket_fd);
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91 LOG_D("[E2AP] Received RIC-SUBSCRIPTION-RESPONSE");
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95 LOG_D("[E2AP] Received RIC-SUBSCRIPTION-FAILURE");
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99 LOG_E("[E2AP] Invalid message index=%d in E2AP-PDU", index);
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105 LOG_E("[E2AP] No available handler for procedureCode=%d", procedureCode);
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110 void e2ap_handle_X2SetupRequest(e2ap_pdu_t* pdu, int &socket_fd)
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113 Simply send back X2SetupResponse
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114 Todo: add more handling options (failure, duplicated request, etc.)
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117 e2ap_pdu_t* res_pdu = new_e2ap_pdu();
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120 e2ap_create_X2SetupResponse(res_pdu, cfg);
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121 LOG_D("[E2AP] Created X2-SETUP-RESPONSE")
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123 e2ap_print_pdu(res_pdu);
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125 //encode response pdu into buffer
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126 sctp_buffer_t res_data;
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127 e2ap_encode_pdu(res_pdu, res_data.buffer, sizeof(res_data.buffer), res_data.len);
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129 //send response data over sctp
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130 if(sctp_send_data(socket_fd, res_data) > 0) {
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131 LOG_I("[SCTP] Sent X2-SETUP-RESPONSE");
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133 LOG_E("[SCTP] Unable to send X2-SETUP-RESPONSE to peer");
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137 void e2ap_handle_X2SetupResponse(e2ap_pdu_t* pdu, int &socket_fd)
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142 void e2ap_handle_ENDCX2SetupRequest(e2ap_pdu_t* pdu, int &socket_fd)
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145 Simply send back ENDCX2SetupResponse
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146 Todo: add more handling options (failure, duplicated request, etc.)
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149 e2ap_pdu_t* res_pdu = new_e2ap_pdu();
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150 gNB_config gnb_cfg;
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152 e2ap_create_ENDCX2SetupResponse(res_pdu, gnb_cfg);
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153 LOG_D("[E2AP] Created ENDC-X2-SETUP-RESPONSE");
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155 e2ap_print_pdu(res_pdu);
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157 sctp_buffer_t data;
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158 e2ap_encode_pdu(res_pdu, data.buffer, sizeof(data.buffer), data.len);
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160 //send response data over sctp
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161 if(sctp_send_data(socket_fd, data) > 0) {
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162 LOG_I("[SCTP] Sent ENDC-X2-SETUP-RESPONSE");
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164 LOG_E("[SCTP] Unable to send ENDC-X2-SETUP-RESPONSE to peer");
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168 void e2ap_handle_RICSubscriptionRequest(e2ap_pdu_t* pdu, int &socket_fd)
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170 RICsubscription_params_t params;
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171 e2ap_parse_RICsubscriptionRequest(pdu, params);
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173 /* Example handling logic
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174 - Accept if request id is even-numbered -> send back response
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175 in this case, accept every other actions
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177 - Reject if request id is odd-numbered -> send back failure
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180 e2ap_pdu_t* res_pdu = new_e2ap_pdu();
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181 bool is_failure = false;
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183 if(params.request_id % 2 == 0)
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185 for(size_t i = 0; i < params.actionList.size(); i++)
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188 params.actionList[i].isAdmitted = true;
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190 params.actionList[i].isAdmitted = false;
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191 params.actionList[i].notAdmitted_cause = RICcause_radioNetwork;
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192 params.actionList[i].notAdmitted_subCause = 5;
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196 e2ap_create_RICsubscriptionResponse(res_pdu, params);
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197 LOG_I("[E2AP] Created RIC-SUBSCRIPTION-RESPONSE");
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203 for(size_t i = 0; i < params.actionList.size(); i++)
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205 params.actionList[i].isAdmitted = false;
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206 params.actionList[i].notAdmitted_cause = RICcause_radioNetwork;
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207 params.actionList[i].notAdmitted_subCause = 5;
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210 e2ap_create_RICsubscriptionFailure(res_pdu, params);
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211 LOG_I("[E2AP] Created RIC-SUBSCRIPTION-FAILURE");
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214 e2ap_print_pdu(res_pdu);
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216 //Encode into buffer
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217 sctp_buffer_t data;
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218 e2ap_encode_pdu(res_pdu, data.buffer, sizeof(data.buffer), data.len);
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220 //send response data over sctp
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221 if(sctp_send_data(socket_fd, data) > 0)
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224 LOG_I("[SCTP] Sent RIC-SUBSCRIPTION-FAILURE");
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227 LOG_I("[SCTP] Sent RIC-SUBSCRIPTION-RESPONSE");
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233 LOG_I("[SCTP] Unable to send RIC-SUBSCRIPTION-FAILURE");
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236 LOG_E("[SCTP] Unable to send RIC-SUBSCRIPTION-RESPONSE");
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