3 /*****************************************************************************
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5 # Copyright 2020 AT&T Intellectual Property *
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7 # Licensed under the Apache License, Version 2.0 (the "License"); *
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8 # you may not use this file except in compliance with the License. *
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9 # You may obtain a copy of the License at *
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11 # http://www.apache.org/licenses/LICENSE-2.0 *
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13 # Unless required by applicable law or agreed to in writing, software *
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14 # distributed under the License is distributed on an "AS IS" BASIS, *
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15 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
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16 # See the License for the specific language governing permissions and *
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17 # limitations under the License. *
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19 ******************************************************************************/
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20 #include "e2ap_message_handler.hpp"
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22 //#include <iostream>
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25 #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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32 fprintf(stderr, "in e2ap_handle_sctp_data()\n");
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33 //decode the data into E2AP-PDU
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34 E2AP_PDU_t* pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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35 ASN_STRUCT_RESET(asn_DEF_E2AP_PDU, pdu);
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37 fprintf(stderr, "decoding...\n");
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39 asn_transfer_syntax syntax;
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42 syntax = ATS_ALIGNED_BASIC_PER;
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45 fprintf(stderr, "full buffer\n%s\n", data.buffer);
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46 // e2ap_asn1c_decode_pdu(pdu, data.buffer, data.len);
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48 auto rval = asn_decode(nullptr, syntax, &asn_DEF_E2AP_PDU, (void **) &pdu,
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49 data.buffer, data.len);
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52 int index = (int)pdu->present;
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53 fprintf(stderr, "length of data %d\n", rval.consumed);
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54 fprintf(stderr, "result %d\n", rval.code);
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55 fprintf(stderr, "index is %d\n", index);
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57 fprintf(stderr, "showing xer of data\n");
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59 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu);
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61 int procedureCode = e2ap_asn1c_get_procedureCode(pdu);
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62 index = (int)pdu->present;
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64 LOG_D("[E2AP] Unpacked E2AP-PDU: index = %d, procedureCode = %d\n",
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65 index, procedureCode);
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67 switch(procedureCode)
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70 case ProcedureCode_id_E2setup:
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73 case E2AP_PDU_PR_initiatingMessage:
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74 e2ap_handle_E2SetupRequest(pdu, socket_fd);
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75 LOG_I("[E2AP] Received SETUP-REQUEST");
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78 case E2AP_PDU_PR_successfulOutcome:
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79 LOG_I("[E2AP] Received SETUP-RESPONSE-SUCCESS");
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82 case E2AP_PDU_PR_unsuccessfulOutcome:
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83 LOG_I("[E2AP] Received SETUP-RESPONSE-FAILURE");
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87 LOG_E("[E2AP] Invalid message index=%d in E2AP-PDU", index);
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92 case ProcedureCode_id_Reset: //reset = 7
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95 case E2AP_PDU_PR_initiatingMessage:
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96 LOG_I("[E2AP] Received RESET-REQUEST");
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99 case E2AP_PDU_PR_successfulOutcome:
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102 case E2AP_PDU_PR_unsuccessfulOutcome:
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106 LOG_E("[E2AP] Invalid message index=%d in E2AP-PDU", index);
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111 case ProcedureCode_id_RICsubscription: //RIC SUBSCRIPTION = 201
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114 case E2AP_PDU_PR_initiatingMessage: { //initiatingMessage
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115 LOG_I("[E2AP] Received RIC-SUBSCRIPTION-REQUEST");
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116 // e2ap_handle_RICSubscriptionRequest(pdu, socket_fd);
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117 long func_id = encoding::get_function_id_from_subscription(pdu);
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118 fprintf(stderr, "Function Id of message is %d\n", func_id);
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119 SubscriptionCallback cb;
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121 bool func_exists = true;
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124 cb = e2sim->get_subscription_callback(func_id);
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125 } catch(const std::out_of_range& e) {
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126 func_exists = false;
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130 fprintf(stderr, "Calling callback function\n");
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133 fprintf(stderr, "Error: No RAN Function with this ID exists\n");
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135 // callback_kpm_subscription_request(pdu, socket_fd);
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140 case E2AP_PDU_PR_successfulOutcome:
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141 LOG_I("[E2AP] Received RIC-SUBSCRIPTION-RESPONSE");
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144 case E2AP_PDU_PR_unsuccessfulOutcome:
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145 LOG_I("[E2AP] Received RIC-SUBSCRIPTION-FAILURE");
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149 LOG_E("[E2AP] Invalid message index=%d in E2AP-PDU", index);
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154 case ProcedureCode_id_RICindication: // 205
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157 case E2AP_PDU_PR_initiatingMessage: //initiatingMessage
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158 LOG_I("[E2AP] Received RIC-INDICATION-REQUEST");
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159 // e2ap_handle_RICSubscriptionRequest(pdu, socket_fd);
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161 case E2AP_PDU_PR_successfulOutcome:
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162 LOG_I("[E2AP] Received RIC-INDICATION-RESPONSE");
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165 case E2AP_PDU_PR_unsuccessfulOutcome:
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166 LOG_I("[E2AP] Received RIC-INDICATION-FAILURE");
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170 LOG_E("[E2AP] Invalid message index=%d in E2AP-PDU %d", index,
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171 (int)ProcedureCode_id_RICindication);
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178 LOG_E("[E2AP] No available handler for procedureCode=%d", procedureCode);
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184 void e2ap_handle_E2SetupRequest(E2AP_PDU_t* pdu, int &socket_fd) {
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187 E2AP_PDU_t* res_pdu = (E2AP_PDU_t*)calloc(1, sizeof(E2AP_PDU));
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188 encoding::generate_e2apv1_setup_response(res_pdu);
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191 LOG_D("[E2AP] Created E2-SETUP-RESPONSE");
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193 e2ap_asn1c_print_pdu(res_pdu);
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196 auto buffer_size = MAX_SCTP_BUFFER;
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197 unsigned char buffer[MAX_SCTP_BUFFER];
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199 sctp_buffer_t data;
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200 auto er = asn_encode_to_buffer(nullptr, ATS_BASIC_XER, &asn_DEF_E2AP_PDU, res_pdu, buffer, buffer_size);
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202 data.len = er.encoded;
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203 fprintf(stderr, "er encoded is %d\n", er.encoded);
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205 //data.len = e2ap_asn1c_encode_pdu(res_pdu, &buf);
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206 memcpy(data.buffer, buffer, er.encoded);
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208 //send response data over sctp
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209 if(sctp_send_data(socket_fd, data) > 0) {
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210 LOG_I("[SCTP] Sent E2-SETUP-RESPONSE");
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212 LOG_E("[SCTP] Unable to send E2-SETUP-RESPONSE to peer");
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217 //Sending Subscription Request
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219 E2AP_PDU_t* pdu_sub = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
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221 encoding::generate_e2apv1_subscription_request(pdu_sub);
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223 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_sub);
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225 auto buffer_size2 = MAX_SCTP_BUFFER;
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226 unsigned char buffer2[MAX_SCTP_BUFFER];
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228 sctp_buffer_t data2;
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230 auto er2 = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_sub, buffer2, buffer_size2);
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232 data2.len = er2.encoded;
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233 memcpy(data2.buffer, buffer2, er2.encoded);
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235 fprintf(stderr, "er encded is %d\n", er2.encoded);
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237 if(sctp_send_data(socket_fd, data2) > 0) {
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238 LOG_I("[SCTP] Sent E2-SUBSCRIPTION-REQUEST");
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240 LOG_E("[SCTP] Unable to send E2-SUBSCRIPTION-REQUEST to peer");
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247 void e2ap_handle_RICSubscriptionRequest(E2AP_PDU_t* pdu, int &socket_fd)
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250 //Send back Subscription Success Response
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252 E2AP_PDU_t* pdu_resp = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
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254 generate_e2apv1_subscription_response(pdu_resp, pdu);
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256 fprintf(stderr, "Subscription Response\n");
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258 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_resp);
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260 auto buffer_size2 = MAX_SCTP_BUFFER;
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261 unsigned char buffer2[MAX_SCTP_BUFFER];
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263 sctp_buffer_t data2;
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265 auto er2 = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_resp, buffer2, buffer_size2);
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266 data2.len = er2.encoded;
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268 fprintf(stderr, "er encded is %d\n", er2.encoded);
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270 memcpy(data2.buffer, buffer2, er2.encoded);
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272 if(sctp_send_data(socket_fd, data2) > 0) {
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273 LOG_I("[SCTP] Sent RIC-SUBSCRIPTION-RESPONSE");
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275 LOG_E("[SCTP] Unable to send RIC-SUBSCRIPTION-RESPONSE to peer");
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279 //Send back an Indication
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281 E2AP_PDU_t* pdu_ind = (E2AP_PDU_t*)calloc(1,sizeof(E2AP_PDU));
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283 generate_e2apv1_indication_request(pdu_ind);
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285 xer_fprint(stderr, &asn_DEF_E2AP_PDU, pdu_ind);
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287 auto buffer_size = MAX_SCTP_BUFFER;
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288 unsigned char buffer[MAX_SCTP_BUFFER];
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290 sctp_buffer_t data;
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292 auto er = asn_encode_to_buffer(nullptr, ATS_ALIGNED_BASIC_PER, &asn_DEF_E2AP_PDU, pdu_ind, buffer, buffer_size);
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293 data.len = er.encoded;
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295 fprintf(stderr, "er encded is %d\n", er.encoded);
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297 memcpy(data.buffer, buffer, er.encoded);
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299 if(sctp_send_data(socket_fd, data) > 0) {
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300 LOG_I("[SCTP] Sent RIC-INDICATION-REQUEST");
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302 LOG_E("[SCTP] Unable to send RIC-INDICATION-REQUEST to peer");
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