3 /*****************************************************************************
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5 # Copyright 2020 AT&T Intellectual Property *
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6 # Copyright (c) 2020 Samsung Electronics Co., Ltd. All Rights Reserved. *
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8 # Licensed under the Apache License, Version 2.0 (the "License"); *
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9 # you may not use this file except in compliance with the License. *
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10 # You may obtain a copy of the License at *
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12 # http://www.apache.org/licenses/LICENSE-2.0 *
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14 # Unless required by applicable law or agreed to in writing, software *
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15 # distributed under the License is distributed on an "AS IS" BASIS, *
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16 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
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17 # See the License for the specific language governing permissions and *
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18 # limitations under the License. *
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20 ******************************************************************************/
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21 #include "e2ap_message_handler.hpp"
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23 //#include <iostream>
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25 #include <stdexcept>
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28 #include "encode_e2apv1.hpp"
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30 void e2ap_handle_sctp_data(int& socket_fd, sctp_buffer_t& data, bool xmlenc, E2Sim* e2sim) {
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31 E2AP_PDU_t* pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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32 ASN_STRUCT_RESET(asn_DEF_E2AP_PDU, pdu);
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34 asn_transfer_syntax syntax;
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36 syntax = ATS_ALIGNED_BASIC_PER;
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37 auto rval = asn_decode(nullptr, syntax, &asn_DEF_E2AP_PDU, (void**)&pdu, data.buffer, data.len);
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39 switch (rval.code) {
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42 LOG_E("Failed to decode E2AP data from SCTP connection");
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43 ASN_STRUCT_FREE(asn_DEF_E2AP_PDU, pdu);
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49 int procedureCode = e2ap_asn1c_get_procedureCode(pdu);
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50 int index = (int)pdu->present;
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52 LOG_D("Unpacked E2AP-PDU: index = %d, procedureCode = %d\n", index, procedureCode);
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54 switch (procedureCode) {
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55 case ProcedureCode_id_E2setup:
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56 LOG_I("Received a message of E2 setup procedure");
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58 case E2AP_PDU_PR_initiatingMessage:
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59 e2ap_handle_E2SetupRequest(pdu, socket_fd);
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60 LOG_I("Received SETUP-REQUEST");
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63 case E2AP_PDU_PR_successfulOutcome:
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64 LOG_I("Received SETUP-RESPONSE-SUCCESS");
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67 case E2AP_PDU_PR_unsuccessfulOutcome:
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68 LOG_I("Received SETUP-RESPONSE-FAILURE");
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72 LOG_E("Invalid message index=%d in E2AP-PDU", index);
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77 case ProcedureCode_id_Reset: // reset = 7
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78 LOG_I("Received a message of Reset procedure");
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80 case E2AP_PDU_PR_initiatingMessage:
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81 LOG_I("Received RESET-REQUEST");
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84 case E2AP_PDU_PR_successfulOutcome:
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87 case E2AP_PDU_PR_unsuccessfulOutcome:
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91 LOG_E("Invalid message index=%d in E2AP-PDU", index);
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96 case ProcedureCode_id_RICsubscription: // RIC SUBSCRIPTION = 201
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97 LOG_I("Received a message of RIC subscription procedure");
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99 case E2AP_PDU_PR_initiatingMessage: { // initiatingMessage
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100 LOG_I("Received RIC-SUBSCRIPTION-REQUEST");
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101 // e2ap_handle_RICSubscriptionRequest(pdu, socket_fd);
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102 long func_id = encoding::get_function_id_from_subscription(pdu);
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103 fprintf(stderr, "Function Id of message is %d\n", func_id);
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104 SubscriptionCallback cb;
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106 bool func_exists = true;
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109 cb = e2sim->get_subscription_callback(func_id);
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110 } catch (const std::out_of_range& e) {
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111 func_exists = false;
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115 fprintf(stderr, "Calling callback function\n");
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118 fprintf(stderr, "Error: No RAN Function with this ID exists\n");
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120 // callback_kpm_subscription_request(pdu, socket_fd);
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124 case E2AP_PDU_PR_successfulOutcome:
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125 LOG_I("Received RIC-SUBSCRIPTION-RESPONSE");
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128 case E2AP_PDU_PR_unsuccessfulOutcome:
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129 LOG_I("Received RIC-SUBSCRIPTION-FAILURE");
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133 LOG_E("Invalid message index=%d in E2AP-PDU", index);
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138 case ProcedureCode_id_RICindication: // 205
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139 LOG_I("Received a message of RIC indication procedure");
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141 case E2AP_PDU_PR_initiatingMessage: // initiatingMessage
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142 LOG_I("Received RIC-INDICATION-REQUEST");
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143 // e2ap_handle_RICSubscriptionRequest(pdu, socket_fd);
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145 case E2AP_PDU_PR_successfulOutcome:
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146 LOG_I("Received RIC-INDICATION-RESPONSE");
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149 case E2AP_PDU_PR_unsuccessfulOutcome:
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150 LOG_I("Received RIC-INDICATION-FAILURE");
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154 LOG_E("Invalid message index=%d in E2AP-PDU %d", index, (int)ProcedureCode_id_RICindication);
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159 case ProcedureCode_id_RICserviceQuery:
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160 LOG_I("Received a message of RIC service query procedure");
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162 case E2AP_PDU_PR_initiatingMessage:
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163 LOG_I("Received RIC-Service-Query")
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164 e2ap_handle_E2SeviceRequest(pdu, socket_fd, e2sim);
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168 LOG_E("Invalid message index=%d in E2AP-PDU %d", index, (int)ProcedureCode_id_RICserviceQuery);
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173 case ProcedureCode_id_E2nodeConfigurationUpdate:
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174 LOG_I("Received a message of E2 node configuration update procedure");
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176 case E2AP_PDU_PR_successfulOutcome:
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177 LOG_I("Received E2nodeConfigurationUpdate")
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181 LOG_E("Invalid message index=%d in E2AP-PDU %d", index, (int)ProcedureCode_id_E2nodeConfigurationUpdate);
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186 case ProcedureCode_id_RICserviceUpdate:
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187 LOG_I("Received a message of RIC service update procedure");
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189 case E2AP_PDU_PR_successfulOutcome:
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190 LOG_I("Received RIC-SERVICE-UPDATE-SUCCESS")
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193 case E2AP_PDU_PR_unsuccessfulOutcome:
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194 LOG_I("Received RIC-SERVICE-UPDATE-FAILURE")
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198 LOG_E("Invalid message index=%d in E2AP-PDU %d", index, (int)ProcedureCode_id_RICserviceUpdate);
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204 LOG_E("No available handler for procedureCode=%d", procedureCode);
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207 ASN_STRUCT_FREE(asn_DEF_E2AP_PDU, pdu);
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210 void e2ap_handle_E2SeviceRequest(E2AP_PDU_t* pdu, int& socket_fd, E2Sim* e2sim) {
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211 auto buffer_size = MAX_SCTP_BUFFER;
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212 unsigned char buffer[MAX_SCTP_BUFFER];
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213 E2AP_PDU_t* res_pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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215 // prepare ran function defination
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216 std::vector<encoding::ran_func_info> all_funcs;
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218 // Loop through RAN function definitions that are registered
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220 for (std::pair<long, OCTET_STRING_t*> elem : e2sim->getRegistered_ran_functions()) {
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221 printf("looping through ran func\n");
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222 encoding::ran_func_info next_func;
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224 next_func.ranFunctionId = elem.first;
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225 next_func.ranFunctionDesc = elem.second;
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226 next_func.ranFunctionRev = (long)3;
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227 all_funcs.push_back(next_func);
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230 printf("about to call service update encode\n");
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232 encoding::generate_e2apv1_service_update(res_pdu, all_funcs);
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234 LOG_D("Created E2-SERVICE-UPDATE");
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236 e2ap_asn1c_print_pdu(res_pdu);
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238 sctp_buffer_t data;
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240 char error_buf[300] = {
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245 asn_check_constraints(&asn_DEF_E2AP_PDU, res_pdu, error_buf, &errlen);
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246 printf("error length %d\n", errlen);
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247 printf("error buf %s\n", error_buf);
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249 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, res_pdu, buffer, buffer_size);
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251 if (er.encoded == -1) {
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252 LOG_E("Failed to serialize message. Detail: %s.\n", asn_DEF_E2AP_PDU.name);
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254 } else if (er.encoded > buffer_size) {
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255 LOG_E("Buffer of size %zu is too small for %s, need %zu\n", buffer_size, asn_DEF_E2AP_PDU.name, er.encoded);
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259 data.len = er.encoded;
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261 memcpy(data.buffer, buffer, er.encoded);
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263 // send response data over sctp
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264 if (sctp_send_data(socket_fd, data) > 0) {
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265 LOG_I("Sent E2-SERVICE-UPDATE");
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267 LOG_E("Unable to send E2-SERVICE-UPDATE to peer");
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271 void e2ap_send_e2nodeConfigUpdate(int& socket_fd) {
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272 auto buffer_size = MAX_SCTP_BUFFER;
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273 unsigned char buffer[MAX_SCTP_BUFFER];
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274 E2AP_PDU_t* pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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276 LOG_I("Generating E2 node configure update");
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278 encoding::generate_e2apv2_config_update(pdu);
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280 e2ap_asn1c_print_pdu(pdu);
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282 sctp_buffer_t data;
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284 char error_buf[300] = {
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289 asn_check_constraints(&asn_DEF_E2AP_PDU, pdu, error_buf, &errlen);
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291 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu, buffer, buffer_size);
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293 if (er.encoded == -1) {
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294 LOG_E("Failed to serialize message. Detail: %s.\n", asn_DEF_E2AP_PDU.name);
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296 } else if (er.encoded > buffer_size) {
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297 LOG_E("Buffer of size %zu is too small for %s, need %zu\n", buffer_size, asn_DEF_E2AP_PDU.name, er.encoded);
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301 data.len = er.encoded;
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303 memcpy(data.buffer, buffer, er.encoded);
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305 // send response data over sctp
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306 if (sctp_send_data(socket_fd, data) > 0) {
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307 LOG_I("Sent E2nodeConfigUpdate");
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309 LOG_E("[SCTP] Unable to send E2nodeConfigUpdate to peer");
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313 void e2ap_handle_E2SetupRequest(E2AP_PDU_t* pdu, int& socket_fd) {
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314 E2AP_PDU_t* res_pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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315 encoding::generate_e2apv1_setup_response(res_pdu);
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317 LOG_D("Created E2-SETUP-RESPONSE");
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319 e2ap_asn1c_print_pdu(res_pdu);
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321 auto buffer_size = MAX_SCTP_BUFFER;
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322 unsigned char buffer[MAX_SCTP_BUFFER];
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324 sctp_buffer_t data;
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325 auto er = asn_encode_to_buffer(nullptr, ATS_BASIC_XER, &asn_DEF_E2AP_PDU, res_pdu, buffer, buffer_size);
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327 if (er.encoded == -1) {
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328 LOG_E("Failed to serialize message. Detail: %s.\n", asn_DEF_E2AP_PDU.name);
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330 } else if (er.encoded > buffer_size) {
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331 LOG_E("Buffer of size %zu is too small for %s, need %zu\n", buffer_size, asn_DEF_E2AP_PDU.name, er.encoded);
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335 data.len = er.encoded;
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337 memcpy(data.buffer, buffer, er.encoded);
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339 // send response data over sctp
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340 if (sctp_send_data(socket_fd, data) > 0) {
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341 LOG_I("Sent E2-SETUP-RESPONSE");
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343 LOG_E("[SCTP] Unable to send E2-SETUP-RESPONSE to peer");
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348 // Sending Subscription Request
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350 E2AP_PDU_t* pdu_sub = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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352 encoding::generate_e2apv1_subscription_request(pdu_sub);
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354 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_sub);
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356 auto buffer_size2 = MAX_SCTP_BUFFER;
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357 unsigned char buffer2[MAX_SCTP_BUFFER];
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359 sctp_buffer_t data2;
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361 auto er2 = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_sub, buffer2, buffer_size2);
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363 if (er2.encoded == -1) {
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364 LOG_E("Failed to serialize message. Detail: %s.\n", asn_DEF_E2AP_PDU.name);
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366 } else if (er2.encoded > buffer_size2) {
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367 LOG_E("Buffer of size %zu is too small for %s, need %zu\n", buffer_size2, asn_DEF_E2AP_PDU.name, er2.encoded);
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371 data2.len = er2.encoded;
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372 memcpy(data2.buffer, buffer2, er2.encoded);
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374 if (sctp_send_data(socket_fd, data2) > 0) {
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375 LOG_I("Sent E2-SUBSCRIPTION-REQUEST");
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377 LOG_E("[SCTP] Unable to send E2-SUBSCRIPTION-REQUEST to peer");
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382 void e2ap_handle_RICSubscriptionRequest(E2AP_PDU_t* pdu, int &socket_fd)
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385 //Send back Subscription Success Response
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387 E2AP_PDU_t* pdu_resp = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
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389 generate_e2apv1_subscription_response(pdu_resp, pdu);
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391 fprintf(stderr, "Subscription Response\n");
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393 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_resp);
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395 auto buffer_size2 = MAX_SCTP_BUFFER;
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396 unsigned char buffer2[MAX_SCTP_BUFFER];
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398 sctp_buffer_t data2;
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400 auto er2 = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_resp, buffer2, buffer_size2);
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401 data2.len = er2.encoded;
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403 fprintf(stderr, "er encded is %d\n", er2.encoded);
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405 memcpy(data2.buffer, buffer2, er2.encoded);
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407 if(sctp_send_data(socket_fd, data2) > 0) {
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408 LOG_I("Sent RIC-SUBSCRIPTION-RESPONSE");
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410 LOG_E("[SCTP] Unable to send RIC-SUBSCRIPTION-RESPONSE to peer");
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414 //Send back an Indication
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416 E2AP_PDU_t* pdu_ind = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
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418 generate_e2apv1_indication_request(pdu_ind);
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420 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_ind);
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422 auto buffer_size = MAX_SCTP_BUFFER;
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423 unsigned char buffer[MAX_SCTP_BUFFER];
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425 sctp_buffer_t data;
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427 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_ind, buffer, buffer_size);
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428 data.len = er.encoded;
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430 fprintf(stderr, "er encded is %d\n", er.encoded);
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432 memcpy(data.buffer, buffer, er.encoded);
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434 if(sctp_send_data(socket_fd, data) > 0) {
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435 LOG_I("Sent RIC-INDICATION-REQUEST");
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437 LOG_E("[SCTP] Unable to send RIC-INDICATION-REQUEST to peer");
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