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openairinterface5g/openair3/NAS/NR_UE/nr_nas_msg_sim.c
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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/*! \file nr_nas_msg_sim.c
* \brief simulator for nr nas message
* \author Yoshio INOUE, Masayuki HARADA
* \email yoshio.inoue@fujitsu.com,masayuki.harada@fujitsu.com
* \date 2020
* \version 0.1
*
* 2023.01.27 Vladimir Dorovskikh 16 digits IMEISV
*/
#include <string.h> // memset
#include <stdlib.h> // malloc, free
#include "nas_log.h"
#include "TLVDecoder.h"
#include "TLVEncoder.h"
#include "nr_nas_msg_sim.h"
#include "aka_functions.h"
#include "secu_defs.h"
#include "kdf.h"
#include "key_nas_deriver.h"
#include "PduSessionEstablishRequest.h"
#include "PduSessionEstablishmentAccept.h"
#include "RegistrationAccept.h"
#include "FGSDeregistrationRequestUEOriginating.h"
#include "intertask_interface.h"
#include "openair2/RRC/NAS/nas_config.h"
#include <openair3/NAS/COMMON/NR_NAS_defs.h>
#include <openair1/PHY/phy_extern_nr_ue.h>
#include <openair1/SIMULATION/ETH_TRANSPORT/proto.h>
#include "openair2/SDAP/nr_sdap/nr_sdap.h"
#include "openair3/SECU/nas_stream_eia2.h"
#include "openair3/UTILS/conversions.h"
uint8_t *registration_request_buf;
uint32_t registration_request_len;
extern char *baseNetAddress;
extern uint16_t NB_UE_INST;
static nr_ue_nas_t nr_ue_nas = {0};
static nr_nas_msg_snssai_t nas_allowed_nssai[8];
static int nas_protected_security_header_encode(
char *buffer,
const fgs_nas_message_security_header_t *header,
int length)
{
LOG_FUNC_IN;
int size = 0;
/* Encode the protocol discriminator) */
ENCODE_U8(buffer, header->protocol_discriminator, size);
/* Encode the security header type */
ENCODE_U8(buffer+size, (header->security_header_type & 0xf), size);
/* Encode the message authentication code */
ENCODE_U32(buffer+size, header->message_authentication_code, size);
/* Encode the sequence number */
ENCODE_U8(buffer+size, header->sequence_number, size);
LOG_FUNC_RETURN (size);
}
static int _nas_mm_msg_encode_header(const mm_msg_header_t *header,
uint8_t *buffer, uint32_t len) {
int size = 0;
/* Check the buffer length */
if (len < sizeof(mm_msg_header_t)) {
return (TLV_ENCODE_BUFFER_TOO_SHORT);
}
/* Check the protocol discriminator */
if (header->ex_protocol_discriminator != FGS_MOBILITY_MANAGEMENT_MESSAGE) {
LOG_TRACE(ERROR, "ESM-MSG - Unexpected extened protocol discriminator: 0x%x",
header->ex_protocol_discriminator);
return (TLV_ENCODE_PROTOCOL_NOT_SUPPORTED);
}
/* Encode the extendedprotocol discriminator */
ENCODE_U8(buffer + size, header->ex_protocol_discriminator, size);
/* Encode the security header type */
ENCODE_U8(buffer + size, (header->security_header_type & 0xf), size);
/* Encode the message type */
ENCODE_U8(buffer + size, header->message_type, size);
return (size);
}
static int fill_suci(FGSMobileIdentity *mi, const uicc_t *uicc)
{
mi->suci.typeofidentity = FGS_MOBILE_IDENTITY_SUCI;
mi->suci.mncdigit1 = uicc->nmc_size == 2 ? uicc->imsiStr[3] - '0' : uicc->imsiStr[4] - '0';
mi->suci.mncdigit2 = uicc->nmc_size == 2 ? uicc->imsiStr[4] - '0' : uicc->imsiStr[5] - '0';
mi->suci.mncdigit3 = uicc->nmc_size == 2 ? 0xF : uicc->imsiStr[3] - '0';
mi->suci.mccdigit1 = uicc->imsiStr[0] - '0';
mi->suci.mccdigit2 = uicc->imsiStr[1] - '0';
mi->suci.mccdigit3 = uicc->imsiStr[2] - '0';
memcpy(mi->suci.schemeoutput, uicc->imsiStr + 3 + uicc->nmc_size, strlen(uicc->imsiStr) - (3 + uicc->nmc_size));
return sizeof(Suci5GSMobileIdentity_t);
}
static int fill_guti(FGSMobileIdentity *mi, const Guti5GSMobileIdentity_t *guti)
{
AssertFatal(guti != NULL, "UE has no GUTI\n");
mi->guti = *guti;
return 13;
}
static int fill_imeisv(FGSMobileIdentity *mi, const uicc_t *uicc)
{
int i=0;
mi->imeisv.typeofidentity = FGS_MOBILE_IDENTITY_IMEISV;
mi->imeisv.digittac01 = getImeisvDigit(uicc, i++);
mi->imeisv.digittac02 = getImeisvDigit(uicc, i++);
mi->imeisv.digittac03 = getImeisvDigit(uicc, i++);
mi->imeisv.digittac04 = getImeisvDigit(uicc, i++);
mi->imeisv.digittac05 = getImeisvDigit(uicc, i++);
mi->imeisv.digittac06 = getImeisvDigit(uicc, i++);
mi->imeisv.digittac07 = getImeisvDigit(uicc, i++);
mi->imeisv.digittac08 = getImeisvDigit(uicc, i++);
mi->imeisv.digit09 = getImeisvDigit(uicc, i++);
mi->imeisv.digit10 = getImeisvDigit(uicc, i++);
mi->imeisv.digit11 = getImeisvDigit(uicc, i++);
mi->imeisv.digit12 = getImeisvDigit(uicc, i++);
mi->imeisv.digit13 = getImeisvDigit(uicc, i++);
mi->imeisv.digit14 = getImeisvDigit(uicc, i++);
mi->imeisv.digitsv1 = getImeisvDigit(uicc, i++);
mi->imeisv.digitsv2 = getImeisvDigit(uicc, i++);
mi->imeisv.spare = 0x0f;
mi->imeisv.oddeven = 1;
return 19;
}
int mm_msg_encode(MM_msg *mm_msg, uint8_t *buffer, uint32_t len) {
LOG_FUNC_IN;
int header_result;
int encode_result;
uint8_t msg_type = mm_msg->header.message_type;
/* First encode the EMM message header */
header_result = _nas_mm_msg_encode_header(&mm_msg->header, buffer, len);
if (header_result < 0) {
LOG_TRACE(ERROR, "EMM-MSG - Failed to encode EMM message header "
"(%d)", header_result);
LOG_FUNC_RETURN(header_result);
}
buffer += header_result;
len -= header_result;
switch(msg_type) {
case REGISTRATION_REQUEST:
encode_result = encode_registration_request(&mm_msg->registration_request, buffer, len);
break;
case FGS_IDENTITY_RESPONSE:
encode_result = encode_identiy_response(&mm_msg->fgs_identity_response, buffer, len);
break;
case FGS_AUTHENTICATION_RESPONSE:
encode_result = encode_fgs_authentication_response(&mm_msg->fgs_auth_response, buffer, len);
break;
case FGS_SECURITY_MODE_COMPLETE:
encode_result = encode_fgs_security_mode_complete(&mm_msg->fgs_security_mode_complete, buffer, len);
break;
case FGS_UPLINK_NAS_TRANSPORT:
encode_result = encode_fgs_uplink_nas_transport(&mm_msg->uplink_nas_transport, buffer, len);
break;
case FGS_DEREGISTRATION_REQUEST_UE_ORIGINATING:
encode_result = encode_fgs_deregistration_request_ue_originating(&mm_msg->fgs_deregistration_request_ue_originating, buffer, len);
break;
default:
LOG_TRACE(ERROR, "EMM-MSG - Unexpected message type: 0x%x",
mm_msg->header.message_type);
encode_result = TLV_ENCODE_WRONG_MESSAGE_TYPE;
break;
/* TODO: Handle not standard layer 3 messages: SERVICE_REQUEST */
}
if (encode_result < 0) {
LOG_TRACE(ERROR, "EMM-MSG - Failed to encode L3 EMM message 0x%x "
"(%d)", mm_msg->header.message_type, encode_result);
}
if (encode_result < 0)
LOG_FUNC_RETURN (encode_result);
LOG_FUNC_RETURN (header_result + encode_result);
}
void transferRES(uint8_t ck[16], uint8_t ik[16], uint8_t *input, uint8_t rand[16], uint8_t *output, uicc_t* uicc) {
uint8_t S[100]={0};
S[0] = 0x6B;
servingNetworkName (S+1, uicc->imsiStr, uicc->nmc_size);
int netNamesize = strlen((char*)S+1);
S[1 + netNamesize] = (netNamesize & 0xff00) >> 8;
S[2 + netNamesize] = (netNamesize & 0x00ff);
for (int i = 0; i < 16; i++)
S[3 + netNamesize + i] = rand[i];
S[19 + netNamesize] = 0x00;
S[20 + netNamesize] = 0x10;
for (int i = 0; i < 8; i++)
S[21 + netNamesize + i] = input[i];
S[29 + netNamesize] = 0x00;
S[30 + netNamesize] = 0x08;
uint8_t plmn[3] = { 0x02, 0xf8, 0x39 };
uint8_t oldS[100];
oldS[0] = 0x6B;
memcpy(&oldS[1], plmn, 3);
oldS[4] = 0x00;
oldS[5] = 0x03;
for (int i = 0; i < 16; i++)
oldS[6 + i] = rand[i];
oldS[22] = 0x00;
oldS[23] = 0x10;
for (int i = 0; i < 8; i++)
oldS[24 + i] = input[i];
oldS[32] = 0x00;
oldS[33] = 0x08;
uint8_t key[32] = {0};
memcpy(&key[0], ck, 16);
memcpy(&key[16], ik, 16); //KEY
uint8_t out[32] = {0};
byte_array_t data = {.buf = S, .len = 31 + netNamesize};
kdf(key, data, 32, out);
memcpy(output, out + 16, 16);
}
void derive_kausf(uint8_t ck[16], uint8_t ik[16], uint8_t sqn[6], uint8_t kausf[32], uicc_t *uicc) {
uint8_t S[100]={0};
uint8_t key[32] = {0};
memcpy(&key[0], ck, 16);
memcpy(&key[16], ik, 16); //KEY
S[0] = 0x6A;
servingNetworkName (S+1, uicc->imsiStr, uicc->nmc_size);
int netNamesize = strlen((char*)S+1);
S[1 + netNamesize] = (uint8_t)((netNamesize & 0xff00) >> 8);
S[2 + netNamesize] = (uint8_t)(netNamesize & 0x00ff);
for (int i = 0; i < 6; i++) {
S[3 + netNamesize + i] = sqn[i];
}
S[9 + netNamesize] = 0x00;
S[10 + netNamesize] = 0x06;
byte_array_t data = {.buf = S, .len = 11 + netNamesize};
kdf(key, data, 32, kausf);
}
void derive_kseaf(uint8_t kausf[32], uint8_t kseaf[32], uicc_t *uicc) {
uint8_t S[100]={0};
S[0] = 0x6C; //FC
servingNetworkName (S+1, uicc->imsiStr, uicc->nmc_size);
int netNamesize = strlen((char*)S+1);
S[1 + netNamesize] = (uint8_t)((netNamesize & 0xff00) >> 8);
S[2 + netNamesize] = (uint8_t)(netNamesize & 0x00ff);
byte_array_t data = {.buf = S , .len = 3 + netNamesize};
kdf(kausf, data, 32, kseaf);
}
void derive_kamf(uint8_t *kseaf, uint8_t *kamf, uint16_t abba, uicc_t* uicc) {
int imsiLen = strlen(uicc->imsiStr);
uint8_t S[100] = {0};
S[0] = 0x6D; //FC = 0x6D
memcpy(&S[1], uicc->imsiStr, imsiLen );
S[1 + imsiLen] = (uint8_t)((imsiLen & 0xff00) >> 8);
S[2 + imsiLen] = (uint8_t)(imsiLen & 0x00ff);
S[3 + imsiLen] = abba & 0x00ff;
S[4 + imsiLen] = (abba & 0xff00) >> 8;
S[5 + imsiLen] = 0x00;
S[6 + imsiLen] = 0x02;
byte_array_t data = {.buf = S, .len = 7 + imsiLen};
kdf(kseaf, data, 32, kamf);
}
//------------------------------------------------------------------------------
void derive_knas(algorithm_type_dist_t nas_alg_type, uint8_t nas_alg_id, uint8_t kamf[32], uint8_t *knas_int) {
uint8_t S[20] = {0};
uint8_t out[32] = { 0 };
S[0] = 0x69; //FC
S[1] = (uint8_t)(nas_alg_type & 0xFF);
S[2] = 0x00;
S[3] = 0x01;
S[4] = nas_alg_id;
S[5] = 0x00;
S[6] = 0x01;
byte_array_t data = {.buf = S, .len = 7};
kdf(kamf, data, 32, out);
memcpy(knas_int, out+16, 16);
}
void derive_kgnb(uint8_t kamf[32], uint32_t count, uint8_t *kgnb){
/* Compute the KDF input parameter
* S = FC(0x6E) || UL NAS Count || 0x00 0x04 || 0x01 || 0x00 0x01
*/
uint8_t input[32] = {0};
// uint16_t length = 4;
// int offset = 0;
LOG_TRACE(INFO, "%s with count= %d", __FUNCTION__, count);
memset(input, 0, 32);
input[0] = 0x6E;
// P0
input[1] = count >> 24;
input[2] = (uint8_t)(count >> 16);
input[3] = (uint8_t)(count >> 8);
input[4] = (uint8_t)count;
// L0
input[5] = 0;
input[6] = 4;
// P1
input[7] = 0x01;
// L1
input[8] = 0;
input[9] = 1;
byte_array_t data = {.buf = input, .len = 10};
kdf(kamf, data, 32, kgnb);
printf("kgnb : ");
for(int pp=0;pp<32;pp++)
printf("%02x ",kgnb[pp]);
printf("\n");
}
void derive_ue_keys(uint8_t *buf, nr_ue_nas_t *nas) {
uint8_t ak[6];
uint8_t sqn[6];
DevAssert(nas != NULL);
uint8_t *kausf = nas->security.kausf;
uint8_t *kseaf = nas->security.kseaf;
uint8_t *kamf = nas->security.kamf;
uint8_t *knas_int = nas->security.knas_int;
uint8_t *output = nas->security.res;
uint8_t *rand = nas->security.rand;
uint8_t *kgnb = nas->security.kgnb;
// get RAND for authentication request
for(int index = 0; index < 16;index++){
rand[index] = buf[8+index];
}
uint8_t resTemp[16];
uint8_t ck[16], ik[16];
f2345(nas->uicc->key, rand, resTemp, ck, ik, ak, nas->uicc->opc);
transferRES(ck, ik, resTemp, rand, output, nas->uicc);
for(int index = 0; index < 6; index++){
sqn[index] = buf[26+index];
}
derive_kausf(ck, ik, sqn, kausf, nas->uicc);
derive_kseaf(kausf, kseaf, nas->uicc);
derive_kamf(kseaf, kamf, 0x0000, nas->uicc);
derive_knas(0x02, 2, kamf, knas_int);
derive_kgnb(kamf,0,kgnb);
printf("kausf:");
for(int i = 0; i < 32; i++){
printf("%x ", kausf[i]);
}
printf("\n");
printf("kseaf:");
for(int i = 0; i < 32; i++){
printf("%x ", kseaf[i]);
}
printf("\n");
printf("kamf:");
for(int i = 0; i < 32; i++){
printf("%x ", kamf[i]);
}
printf("\n");
printf("knas_int:\n");
for(int i = 0; i < 16; i++){
printf("%x ", knas_int[i]);
}
printf("\n");
}
nr_ue_nas_t *get_ue_nas_info(module_id_t module_id)
{
DevAssert(module_id == 0);
if (!nr_ue_nas.uicc)
nr_ue_nas.uicc = checkUicc(0);
return &nr_ue_nas;
}
void generateRegistrationRequest(as_nas_info_t *initialNasMsg, nr_ue_nas_t *nas)
{
int size = sizeof(mm_msg_header_t);
fgs_nas_message_t nas_msg={0};
MM_msg *mm_msg;
mm_msg = &nas_msg.plain.mm_msg;
// set header
mm_msg->header.ex_protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
mm_msg->header.security_header_type = PLAIN_5GS_MSG;
mm_msg->header.message_type = REGISTRATION_REQUEST;
// set registration request
mm_msg->registration_request.protocoldiscriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
size += 1;
mm_msg->registration_request.securityheadertype = PLAIN_5GS_MSG;
size += 1;
mm_msg->registration_request.messagetype = REGISTRATION_REQUEST;
size += 1;
mm_msg->registration_request.fgsregistrationtype = INITIAL_REGISTRATION;
mm_msg->registration_request.naskeysetidentifier.naskeysetidentifier = 1;
size += 1;
if(nas->guti){
size += fill_guti(&mm_msg->registration_request.fgsmobileidentity, nas->guti);
} else {
size += fill_suci(&mm_msg->registration_request.fgsmobileidentity, nas->uicc);
}
#if 0
/* This cannot be sent in clear, the core network Open5GS rejects the UE.
* TODO: do we have to send this at some point?
* For the time being, let's keep it here for later proper fix.
*/
mm_msg->registration_request.presencemask |= REGISTRATION_REQUEST_5GMM_CAPABILITY_PRESENT;
mm_msg->registration_request.fgmmcapability.iei = REGISTRATION_REQUEST_5GMM_CAPABILITY_IEI;
mm_msg->registration_request.fgmmcapability.length = 1;
mm_msg->registration_request.fgmmcapability.value = 0x7;
size += 3;
#endif
mm_msg->registration_request.presencemask |= REGISTRATION_REQUEST_UE_SECURITY_CAPABILITY_PRESENT;
mm_msg->registration_request.nruesecuritycapability.iei = REGISTRATION_REQUEST_UE_SECURITY_CAPABILITY_IEI;
mm_msg->registration_request.nruesecuritycapability.length = 8;
mm_msg->registration_request.nruesecuritycapability.fg_EA = 0x80;
mm_msg->registration_request.nruesecuritycapability.fg_IA = 0x20;
mm_msg->registration_request.nruesecuritycapability.EEA = 0;
mm_msg->registration_request.nruesecuritycapability.EIA = 0;
size += 10;
// encode the message
initialNasMsg->data = malloc16_clear(size * sizeof(Byte_t));
registration_request_buf = initialNasMsg->data;
initialNasMsg->length = mm_msg_encode(mm_msg, (uint8_t*)(initialNasMsg->data), size);
registration_request_len = initialNasMsg->length;
}
void generateIdentityResponse(as_nas_info_t *initialNasMsg, uint8_t identitytype, uicc_t* uicc) {
int size = sizeof(mm_msg_header_t);
fgs_nas_message_t nas_msg;
memset(&nas_msg, 0, sizeof(fgs_nas_message_t));
MM_msg *mm_msg;
mm_msg = &nas_msg.plain.mm_msg;
// set header
mm_msg->header.ex_protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
mm_msg->header.security_header_type = PLAIN_5GS_MSG;
mm_msg->header.message_type = FGS_IDENTITY_RESPONSE;
// set identity response
mm_msg->fgs_identity_response.protocoldiscriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
size += 1;
mm_msg->fgs_identity_response.securityheadertype = PLAIN_5GS_MSG;
size += 1;
mm_msg->fgs_identity_response.messagetype = FGS_IDENTITY_RESPONSE;
size += 1;
if(identitytype == FGS_MOBILE_IDENTITY_SUCI){
size += fill_suci(&mm_msg->fgs_identity_response.fgsmobileidentity, uicc);
}
// encode the message
initialNasMsg->data = (Byte_t *)malloc(size * sizeof(Byte_t));
initialNasMsg->length = mm_msg_encode(mm_msg, (uint8_t*)(initialNasMsg->data), size);
}
static void generateAuthenticationResp(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg, uint8_t *buf)
{
derive_ue_keys(buf, nas);
OctetString res;
res.length = 16;
res.value = calloc(1,16);
memcpy(res.value, nas->security.res, 16);
int size = sizeof(mm_msg_header_t);
fgs_nas_message_t nas_msg;
memset(&nas_msg, 0, sizeof(fgs_nas_message_t));
MM_msg *mm_msg;
mm_msg = &nas_msg.plain.mm_msg;
// set header
mm_msg->header.ex_protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
mm_msg->header.security_header_type = PLAIN_5GS_MSG;
mm_msg->header.message_type = FGS_AUTHENTICATION_RESPONSE;
// set authentication response
mm_msg->fgs_identity_response.protocoldiscriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
size += 1;
mm_msg->fgs_identity_response.securityheadertype = PLAIN_5GS_MSG;
size += 1;
mm_msg->fgs_identity_response.messagetype = FGS_AUTHENTICATION_RESPONSE;
size += 1;
//set response parameter
mm_msg->fgs_auth_response.authenticationresponseparameter.res = res;
size += 18;
// encode the message
initialNasMsg->data = (Byte_t *)malloc(size * sizeof(Byte_t));
initialNasMsg->length = mm_msg_encode(mm_msg, (uint8_t*)(initialNasMsg->data), size);
}
int nas_itti_kgnb_refresh_req(const uint8_t kgnb[32])
{
MessageDef *message_p;
message_p = itti_alloc_new_message(TASK_NAS_NRUE, 0, NAS_KENB_REFRESH_REQ);
memcpy(NAS_KENB_REFRESH_REQ(message_p).kenb, kgnb, sizeof(NAS_KENB_REFRESH_REQ(message_p).kenb));
return itti_send_msg_to_task(TASK_RRC_NRUE, 0, message_p);
}
static void generateSecurityModeComplete(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg)
{
int size = sizeof(mm_msg_header_t);
fgs_nas_message_t nas_msg;
memset(&nas_msg, 0, sizeof(fgs_nas_message_t));
MM_msg *mm_msg;
nas_stream_cipher_t stream_cipher;
uint8_t mac[4];
// set security protected header
nas_msg.header.protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
nas_msg.header.security_header_type = INTEGRITY_PROTECTED_AND_CIPHERED_WITH_NEW_SECU_CTX;
size += 7;
mm_msg = &nas_msg.security_protected.plain.mm_msg;
// set header
mm_msg->header.ex_protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
mm_msg->header.security_header_type = PLAIN_5GS_MSG;
mm_msg->header.message_type = FGS_SECURITY_MODE_COMPLETE;
// set security mode complete
mm_msg->fgs_security_mode_complete.protocoldiscriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
size += 1;
mm_msg->fgs_security_mode_complete.securityheadertype = PLAIN_5GS_MSG;
size += 1;
mm_msg->fgs_security_mode_complete.messagetype = FGS_SECURITY_MODE_COMPLETE;
size += 1;
size += fill_imeisv(&mm_msg->fgs_security_mode_complete.fgsmobileidentity, nas->uicc);
mm_msg->fgs_security_mode_complete.fgsnasmessagecontainer.nasmessagecontainercontents.value = registration_request_buf;
mm_msg->fgs_security_mode_complete.fgsnasmessagecontainer.nasmessagecontainercontents.length = registration_request_len;
size += (registration_request_len + 2);
// encode the message
initialNasMsg->data = (Byte_t *)malloc(size * sizeof(Byte_t));
int security_header_len = nas_protected_security_header_encode((char*)(initialNasMsg->data),&(nas_msg.header), size);
initialNasMsg->length = security_header_len + mm_msg_encode(mm_msg, (uint8_t*)(initialNasMsg->data+security_header_len), size-security_header_len);
stream_cipher.key = nas->security.knas_int;
stream_cipher.key_length = 16;
stream_cipher.count = nas->security.mm_counter++;
stream_cipher.bearer = 1;
stream_cipher.direction = 0;
stream_cipher.message = (unsigned char *)(initialNasMsg->data + 6);
/* length in bits */
stream_cipher.blength = (initialNasMsg->length - 6) << 3;
// only for Type of integrity protection algorithm: 128-5G-IA2 (2)
stream_compute_integrity(EIA2_128_ALG_ID, &stream_cipher, mac);
printf("mac %x %x %x %x \n", mac[0], mac[1], mac[2], mac[3]);
for(int i = 0; i < 4; i++){
initialNasMsg->data[2+i] = mac[i];
}
}
static void decodeRegistrationAccept(uint8_t *buf, int len, nr_ue_nas_t *nas)
{
registration_accept_msg reg_acc = {0};
/* it seems there is no 5G corresponding emm_msg_decode() function, so here
* we just jump to the right decision */
buf += 7; /* skip security header */
buf += 2; /* skip prot discriminator, security header, half octet */
AssertFatal(*buf == 0x42, "this is not a NAS Registration Accept\n");
buf++;
int decoded = decode_registration_accept(&reg_acc, buf, len);
AssertFatal(decoded > 0, "could not decode registration accept\n");
if (reg_acc.guti) {
AssertFatal(reg_acc.guti->guti.typeofidentity == FGS_MOBILE_IDENTITY_5G_GUTI,
"registration accept 5GS Mobile Identity is not GUTI, but %d\n",
reg_acc.guti->guti.typeofidentity);
nas->guti = malloc(sizeof(*nas->guti));
AssertFatal(nas->guti, "out of memory\n");
*nas->guti = reg_acc.guti->guti;
free(reg_acc.guti); /* no proper memory management for NAS decoded messages */
} else {
LOG_W(NAS, "no GUTI in registration accept\n");
}
}
static void generateRegistrationComplete(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg, SORTransparentContainer *sortransparentcontainer)
{
//wait send RRCReconfigurationComplete and InitialContextSetupResponse
sleep(1);
int length = 0;
int size = 0;
fgs_nas_message_t nas_msg;
nas_stream_cipher_t stream_cipher;
uint8_t mac[4];
memset(&nas_msg, 0, sizeof(fgs_nas_message_t));
fgs_nas_message_security_protected_t *sp_msg;
sp_msg = &nas_msg.security_protected;
// set header
sp_msg->header.protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
sp_msg->header.security_header_type = INTEGRITY_PROTECTED_AND_CIPHERED;
sp_msg->header.message_authentication_code = 0;
sp_msg->header.sequence_number = 1;
length = 7;
sp_msg->plain.mm_msg.registration_complete.protocoldiscriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
length += 1;
sp_msg->plain.mm_msg.registration_complete.securityheadertype = PLAIN_5GS_MSG;
sp_msg->plain.mm_msg.registration_complete.sparehalfoctet = 0;
length += 1;
sp_msg->plain.mm_msg.registration_complete.messagetype = REGISTRATION_COMPLETE;
length += 1;
if(sortransparentcontainer) {
length += sortransparentcontainer->sortransparentcontainercontents.length;
}
// encode the message
initialNasMsg->data = (Byte_t *)malloc(length * sizeof(Byte_t));
/* Encode the first octet of the header (extended protocol discriminator) */
ENCODE_U8(initialNasMsg->data + size, sp_msg->header.protocol_discriminator, size);
/* Encode the security header type */
ENCODE_U8(initialNasMsg->data + size, sp_msg->header.security_header_type, size);
/* Encode the message authentication code */
ENCODE_U32(initialNasMsg->data + size, sp_msg->header.message_authentication_code, size);
/* Encode the sequence number */
ENCODE_U8(initialNasMsg->data + size, sp_msg->header.sequence_number, size);
/* Encode the extended protocol discriminator */
ENCODE_U8(initialNasMsg->data + size, sp_msg->plain.mm_msg.registration_complete.protocoldiscriminator, size);
/* Encode the security header type */
ENCODE_U8(initialNasMsg->data + size, sp_msg->plain.mm_msg.registration_complete.securityheadertype, size);
/* Encode the message type */
ENCODE_U8(initialNasMsg->data + size, sp_msg->plain.mm_msg.registration_complete.messagetype, size);
if(sortransparentcontainer) {
encode_registration_complete(&sp_msg->plain.mm_msg.registration_complete, initialNasMsg->data + size, length - size);
}
initialNasMsg->length = length;
stream_cipher.key = nas->security.knas_int;
stream_cipher.key_length = 16;
stream_cipher.count = nas->security.mm_counter++;
stream_cipher.bearer = 1;
stream_cipher.direction = 0;
stream_cipher.message = (unsigned char *)(initialNasMsg->data + 6);
/* length in bits */
stream_cipher.blength = (initialNasMsg->length - 6) << 3;
// only for Type of integrity protection algorithm: 128-5G-IA2 (2)
stream_compute_integrity(EIA2_128_ALG_ID, &stream_cipher, mac);
printf("mac %x %x %x %x \n", mac[0], mac[1], mac[2], mac[3]);
for(int i = 0; i < 4; i++){
initialNasMsg->data[2+i] = mac[i];
}
}
void decodeDownlinkNASTransport(as_nas_info_t *initialNasMsg, uint8_t * pdu_buffer){
uint8_t msg_type = *(pdu_buffer + 16);
if(msg_type == FGS_PDU_SESSION_ESTABLISHMENT_ACC){
sprintf(baseNetAddress, "%d.%d", *(pdu_buffer + 39),*(pdu_buffer + 40));
int third_octet = *(pdu_buffer + 41);
int fourth_octet = *(pdu_buffer + 42);
LOG_A(NAS, "Received PDU Session Establishment Accept\n");
nas_config(1,third_octet,fourth_octet,"ue");
} else {
LOG_E(NAS, "Received unexpected message in DLinformationTransfer %d\n", msg_type);
}
}
static void generateDeregistrationRequest(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg, const nas_deregistration_req_t *req)
{
fgs_nas_message_t nas_msg = {0};
fgs_nas_message_security_protected_t *sp_msg;
sp_msg = &nas_msg.security_protected;
sp_msg->header.protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
sp_msg->header.security_header_type = INTEGRITY_PROTECTED_AND_CIPHERED;
sp_msg->header.message_authentication_code = 0;
sp_msg->header.sequence_number = 2;
int size = sizeof(fgs_nas_message_security_header_t);
fgs_deregistration_request_ue_originating_msg *dereg_req = &sp_msg->plain.mm_msg.fgs_deregistration_request_ue_originating;
dereg_req->protocoldiscriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
size += 1;
dereg_req->securityheadertype = INTEGRITY_PROTECTED_AND_CIPHERED_WITH_NEW_SECU_CTX;
size += 1;
dereg_req->messagetype = FGS_DEREGISTRATION_REQUEST_UE_ORIGINATING;
size += 1;
dereg_req->deregistrationtype.switchoff = NORMAL_DEREGISTRATION;
dereg_req->deregistrationtype.reregistration_required = REREGISTRATION_NOT_REQUIRED;
dereg_req->deregistrationtype.access_type = TGPP_ACCESS;
dereg_req->naskeysetidentifier.naskeysetidentifier = 1;
size += 1;
size += fill_guti(&dereg_req->fgsmobileidentity, nas->guti);
// encode the message
initialNasMsg->data = calloc(size, sizeof(Byte_t));
int security_header_len = nas_protected_security_header_encode((char *)(initialNasMsg->data), &nas_msg.header, size);
initialNasMsg->length = security_header_len + mm_msg_encode(&sp_msg->plain.mm_msg, (uint8_t *)(initialNasMsg->data + security_header_len), size - security_header_len);
nas_stream_cipher_t stream_cipher = {
.key = nas->security.knas_int,
.key_length = 16,
.count = nas->security.mm_counter++,
.bearer = 1,
.direction = 0,
.message = (unsigned char *)(initialNasMsg->data + 6),
.blength = (initialNasMsg->length - 6) << 3, /* length in bits */
};
uint8_t mac[4];
nas_stream_encrypt_eia2(&stream_cipher, mac);
for(int i = 0; i < 4; i++)
initialNasMsg->data[2 + i] = mac[i];
}
static void generatePduSessionEstablishRequest(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg, nas_pdu_session_req_t *pdu_req)
{
//wait send RegistrationComplete
usleep(100*150);
int size = 0;
fgs_nas_message_t nas_msg={0};
// setup pdu session establishment request
uint16_t req_length = 7;
uint8_t *req_buffer = malloc(req_length);
pdu_session_establishment_request_msg pdu_session_establish;
pdu_session_establish.protocoldiscriminator = FGS_SESSION_MANAGEMENT_MESSAGE;
pdu_session_establish.pdusessionid = pdu_req->pdusession_id;
pdu_session_establish.pti = 1;
pdu_session_establish.pdusessionestblishmsgtype = FGS_PDU_SESSION_ESTABLISHMENT_REQ;
pdu_session_establish.maxdatarate = 0xffff;
pdu_session_establish.pdusessiontype = pdu_req->pdusession_type;
encode_pdu_session_establishment_request(&pdu_session_establish, req_buffer);
MM_msg *mm_msg;
nas_stream_cipher_t stream_cipher;
uint8_t mac[4];
nas_msg.header.protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
nas_msg.header.security_header_type = INTEGRITY_PROTECTED_AND_CIPHERED_WITH_NEW_SECU_CTX;
size += 7;
mm_msg = &nas_msg.security_protected.plain.mm_msg;
// set header
mm_msg->header.ex_protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
mm_msg->header.security_header_type = PLAIN_5GS_MSG;
mm_msg->header.message_type = FGS_UPLINK_NAS_TRANSPORT;
// set uplink nas transport
mm_msg->uplink_nas_transport.protocoldiscriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
size += 1;
mm_msg->uplink_nas_transport.securityheadertype = PLAIN_5GS_MSG;
size += 1;
mm_msg->uplink_nas_transport.messagetype = FGS_UPLINK_NAS_TRANSPORT;
size += 1;
mm_msg->uplink_nas_transport.payloadcontainertype.iei = 0;
mm_msg->uplink_nas_transport.payloadcontainertype.type = 1;
size += 1;
mm_msg->uplink_nas_transport.fgspayloadcontainer.payloadcontainercontents.length = req_length;
mm_msg->uplink_nas_transport.fgspayloadcontainer.payloadcontainercontents.value = req_buffer;
size += (2+req_length);
mm_msg->uplink_nas_transport.pdusessionid = pdu_req->pdusession_id;
mm_msg->uplink_nas_transport.requesttype = 1;
size += 3;
const bool has_nssai_sd = pdu_req->sd != 0xffffff; // 0xffffff means "no SD", TS 23.003
const size_t nssai_len = has_nssai_sd ? 4 : 1;
mm_msg->uplink_nas_transport.snssai.length = nssai_len;
//Fixme: it seems there are a lot of memory errors in this: this value was on the stack,
// but pushed in a itti message to another thread
// this kind of error seems in many places in 5G NAS
mm_msg->uplink_nas_transport.snssai.value = calloc(1, nssai_len);
mm_msg->uplink_nas_transport.snssai.value[0] = pdu_req->sst;
if (has_nssai_sd)
INT24_TO_BUFFER(pdu_req->sd, &mm_msg->uplink_nas_transport.snssai.value[1]);
size += 1 + 1 + nssai_len;
int dnnSize=strlen(nas->uicc->dnnStr);
mm_msg->uplink_nas_transport.dnn.value=calloc(1,dnnSize+1);
mm_msg->uplink_nas_transport.dnn.length = dnnSize + 1;
mm_msg->uplink_nas_transport.dnn.value[0] = dnnSize;
memcpy(mm_msg->uplink_nas_transport.dnn.value + 1, nas->uicc->dnnStr, dnnSize);
size += (1+1+dnnSize+1);
// encode the message
initialNasMsg->data = (Byte_t *)malloc(size * sizeof(Byte_t));
int security_header_len = nas_protected_security_header_encode((char*)(initialNasMsg->data),&(nas_msg.header), size);
initialNasMsg->length = security_header_len + mm_msg_encode(mm_msg, (uint8_t*)(initialNasMsg->data+security_header_len), size-security_header_len);
stream_cipher.key = nas->security.knas_int;
stream_cipher.key_length = 16;
stream_cipher.count = nas->security.sm_counter++;
stream_cipher.bearer = 1;
stream_cipher.direction = 0;
stream_cipher.message = (unsigned char *)(initialNasMsg->data + 6);
/* length in bits */
stream_cipher.blength = (initialNasMsg->length - 6) << 3;
// only for Type of integrity protection algorithm: 128-5G-IA2 (2)
stream_compute_integrity(EIA2_128_ALG_ID, &stream_cipher, mac);
printf("mac %x %x %x %x \n", mac[0], mac[1], mac[2], mac[3]);
for(int i = 0; i < 4; i++){
initialNasMsg->data[2+i] = mac[i];
}
}
uint8_t get_msg_type(uint8_t *pdu_buffer, uint32_t length) {
uint8_t msg_type = 0;
uint8_t offset = 0;
if ((pdu_buffer != NULL) && (length > 0)) {
if (((nas_msg_header_t *)(pdu_buffer))->choice.security_protected_nas_msg_header_t.security_header_type > 0) {
offset += SECURITY_PROTECTED_5GS_NAS_MESSAGE_HEADER_LENGTH;
if (offset < length) {
msg_type = ((mm_msg_header_t *)(pdu_buffer + offset))->message_type;
if (msg_type == FGS_DOWNLINK_NAS_TRANSPORT) {
dl_nas_transport_t tmp;
memcpy(&tmp, pdu_buffer + offset, sizeof(tmp));
msg_type = tmp.sm_nas_msg_header.message_type;
}
}
} else { // plain 5GS NAS message
msg_type = ((nas_msg_header_t *)(pdu_buffer))->choice.plain_nas_msg_header.message_type;
}
} else {
LOG_I(NAS, "[UE] Received invalid downlink message\n");
}
return msg_type;
}
static void send_nas_uplink_data_req(instance_t instance, const as_nas_info_t *initial_nas_msg)
{
MessageDef *msg = itti_alloc_new_message(TASK_NAS_NRUE, 0, NAS_UPLINK_DATA_REQ);
ul_info_transfer_req_t *req = &NAS_UPLINK_DATA_REQ(msg);
req->UEid = instance;
req->nasMsg.data = (uint8_t *) initial_nas_msg->data;
req->nasMsg.length = initial_nas_msg->length;
itti_send_msg_to_task(TASK_RRC_NRUE, instance, msg);
}
static void send_nas_detach_req(instance_t instance, bool wait_release)
{
MessageDef *msg = itti_alloc_new_message(TASK_NAS_NRUE, 0, NAS_DETACH_REQ);
nas_detach_req_t *req = &NAS_DETACH_REQ(msg);
req->wait_release = wait_release;
itti_send_msg_to_task(TASK_RRC_NRUE, instance, msg);
}
static void parse_allowed_nssai(nr_nas_msg_snssai_t nssaiList[8], const uint8_t *buf, const uint32_t len)
{
int nssai_cnt = 0;
const uint8_t *end = buf + len;
while (buf < end) {
const int length = *buf++;
nr_nas_msg_snssai_t *nssai = nssaiList + nssai_cnt;
nssai->sd = 0xffffff;
switch (length) {
case 1:
nssai->sst = *buf++;
nssai_cnt++;
break;
case 2:
nssai->sst = *buf++;
nssai->hplmn_sst = *buf++;
nssai_cnt++;
break;
case 4:
nssai->sst = *buf++;
nssai->sd = 0xffffff & ntoh_int24_buf(buf);
buf += 3;
nssai_cnt++;
break;
case 5:
nssai->sst = *buf++;
nssai->sd = 0xffffff & ntoh_int24_buf(buf);
buf += 3;
nssai->hplmn_sst = *buf++;
nssai_cnt++;
break;
case 8:
nssai->sst = *buf++;
nssai->sd = 0xffffff & ntoh_int24_buf(buf);
buf += 3;
nssai->hplmn_sst = *buf++;
nssai->hplmn_sd = 0xffffff & ntoh_int24_buf(buf);
buf += 3;
nssai_cnt++;
break;
default:
LOG_E(NAS, "UE received unknown length in an allowed S-NSSAI\n");
break;
}
}
}
/* Extract Allowed NSSAI from Regestration Accept according to
3GPP TS 24.501 Table 8.2.7.1.1
*/
static void get_allowed_nssai(nr_nas_msg_snssai_t nssai[8], const uint8_t *pdu_buffer, const uint32_t pdu_length)
{
if ((pdu_buffer == NULL) || (pdu_length <= 0))
return;
const uint8_t *end = pdu_buffer + pdu_length;
if (((nas_msg_header_t *)(pdu_buffer))->choice.security_protected_nas_msg_header_t.security_header_type > 0) {
pdu_buffer += SECURITY_PROTECTED_5GS_NAS_MESSAGE_HEADER_LENGTH;
}
pdu_buffer += 1 + 1 + 1 + 2; // Mandatory fields offset
/* optional fields */
while (pdu_buffer < end) {
const int type = *pdu_buffer++;
int length = 0;
switch (type) {
case 0x77: // 5GS mobile identity
pdu_buffer += ntoh_int16_buf(pdu_buffer) + sizeof(uint16_t);
break;
case 0x4A: // PLMN list
case 0x54: // 5GS tracking area identity
pdu_buffer += *pdu_buffer + 1; // offset length + 1 byte which contains the length
break;
case 0x15: // allowed NSSAI
length = *pdu_buffer++;
parse_allowed_nssai(nssai, pdu_buffer, length);
break;
default:
LOG_W(NAS, "This NAS IEI is not handled when extracting list of allowed NSSAI\n");
pdu_buffer = end;
break;
}
}
}
static void request_default_pdusession(int instance, int nssai_idx)
{
MessageDef *message_p = itti_alloc_new_message(TASK_NAS_NRUE, 0, NAS_PDU_SESSION_REQ);
NAS_PDU_SESSION_REQ(message_p).pdusession_id = 10; /* first or default pdu session */
NAS_PDU_SESSION_REQ(message_p).pdusession_type = 0x91;
NAS_PDU_SESSION_REQ(message_p).sst = nas_allowed_nssai[nssai_idx].sst;
NAS_PDU_SESSION_REQ(message_p).sd = nas_allowed_nssai[nssai_idx].sd;
itti_send_msg_to_task(TASK_NAS_NRUE, instance, message_p);
}
static int get_user_nssai_idx(const nr_nas_msg_snssai_t allowed_nssai[8], const nr_ue_nas_t *nas)
{
for (int i = 0; i < 8; i++) {
const nr_nas_msg_snssai_t *nssai = allowed_nssai + i;
if ((nas->uicc->nssai_sst == nssai->sst) && (nas->uicc->nssai_sd == nssai->sd))
return i;
}
return -1;
}
void *nas_nrue_task(void *args_p)
{
nr_ue_nas.uicc = checkUicc(0);
while (1) {
nas_nrue(NULL);
}
}
void *nas_nrue(void *args_p)
{
// Wait for a message or an event
nr_ue_nas.uicc = checkUicc(0);
MessageDef *msg_p;
itti_receive_msg(TASK_NAS_NRUE, &msg_p);
if (msg_p != NULL) {
instance_t instance = msg_p->ittiMsgHeader.originInstance;
AssertFatal(instance == 0, "cannot handle more than one UE!\n");
switch (ITTI_MSG_ID(msg_p)) {
case INITIALIZE_MESSAGE:
break;
case TERMINATE_MESSAGE:
itti_exit_task();
break;
case MESSAGE_TEST:
break;
case NAS_CELL_SELECTION_CNF:
LOG_I(NAS,
"[UE %ld] Received %s: errCode %u, cellID %u, tac %u\n",
instance,
ITTI_MSG_NAME(msg_p),
NAS_CELL_SELECTION_CNF(msg_p).errCode,
NAS_CELL_SELECTION_CNF(msg_p).cellID,
NAS_CELL_SELECTION_CNF(msg_p).tac);
// as_stmsi_t s_tmsi={0, 0};
// as_nas_info_t nas_info;
// plmn_t plmnID={0, 0, 0, 0};
// generateRegistrationRequest(&nas_info);
// nr_nas_itti_nas_establish_req(0, AS_TYPE_ORIGINATING_SIGNAL, s_tmsi, plmnID, nas_info.data, nas_info.length, 0);
break;
case NAS_CELL_SELECTION_IND:
LOG_I(NAS,
"[UE %ld] Received %s: cellID %u, tac %u\n",
instance,
ITTI_MSG_NAME(msg_p),
NAS_CELL_SELECTION_IND(msg_p).cellID,
NAS_CELL_SELECTION_IND(msg_p).tac);
/* TODO not processed by NAS currently */
break;
case NAS_PAGING_IND:
LOG_I(NAS, "[UE %ld] Received %s: cause %u\n", instance, ITTI_MSG_NAME(msg_p), NAS_PAGING_IND(msg_p).cause);
/* TODO not processed by NAS currently */
break;
case NAS_PDU_SESSION_REQ: {
as_nas_info_t pduEstablishMsg = {0};
nas_pdu_session_req_t *pduReq = &NAS_PDU_SESSION_REQ(msg_p);
nr_ue_nas_t *nas = get_ue_nas_info(0);
generatePduSessionEstablishRequest(nas, &pduEstablishMsg, pduReq);
if (pduEstablishMsg.length > 0) {
send_nas_uplink_data_req(instance, &pduEstablishMsg);
LOG_I(NAS, "Send NAS_UPLINK_DATA_REQ message(PduSessionEstablishRequest)\n");
}
break;
}
case NAS_CONN_ESTABLI_CNF: {
LOG_I(NAS,
"[UE %ld] Received %s: errCode %u, length %u\n",
instance,
ITTI_MSG_NAME(msg_p),
NAS_CONN_ESTABLI_CNF(msg_p).errCode,
NAS_CONN_ESTABLI_CNF(msg_p).nasMsg.length);
uint8_t *pdu_buffer = NAS_CONN_ESTABLI_CNF(msg_p).nasMsg.data;
int msg_type = get_msg_type(pdu_buffer, NAS_CONN_ESTABLI_CNF(msg_p).nasMsg.length);
if (msg_type == REGISTRATION_ACCEPT) {
LOG_I(NAS, "[UE] Received REGISTRATION ACCEPT message\n");
nr_ue_nas_t *nas = get_ue_nas_info(0);
decodeRegistrationAccept(pdu_buffer, NAS_CONN_ESTABLI_CNF(msg_p).nasMsg.length, nas);
get_allowed_nssai(nas_allowed_nssai, pdu_buffer, NAS_CONN_ESTABLI_CNF(msg_p).nasMsg.length);
as_nas_info_t initialNasMsg = {0};
generateRegistrationComplete(nas, &initialNasMsg, NULL);
if (initialNasMsg.length > 0) {
send_nas_uplink_data_req(instance, &initialNasMsg);
LOG_I(NAS, "Send NAS_UPLINK_DATA_REQ message(RegistrationComplete)\n");
}
const int nssai_idx = get_user_nssai_idx(nas_allowed_nssai, nas);
if (nssai_idx < 0) {
LOG_E(NAS, "NSSAI parameters not match with allowed NSSAI. Couldn't request PDU session.\n");
} else {
request_default_pdusession(instance, nssai_idx);
}
} else if (msg_type == FGS_PDU_SESSION_ESTABLISHMENT_ACC) {
capture_pdu_session_establishment_accept_msg(pdu_buffer, NAS_CONN_ESTABLI_CNF(msg_p).nasMsg.length);
}
break;
}
case NR_NAS_CONN_RELEASE_IND:
LOG_I(NAS, "[UE %ld] Received %s: cause %u\n",
instance, ITTI_MSG_NAME (msg_p), NR_NAS_CONN_RELEASE_IND (msg_p).cause);
nr_ue_nas_t *nas = get_ue_nas_info(0);
// TODO handle connection release
if (nas->termination_procedure) {
/* the following is not clean, but probably necessary: we need to give
* time to RLC to Ack the SRB1 PDU which contained the RRC release
* message. Hence, we just below wait some time, before finally
* unblocking the nr-uesoftmodem, which will terminate the process. */
usleep(100000);
itti_wait_tasks_unblock(); /* will unblock ITTI to stop nr-uesoftmodem */
}
break;
case NAS_UPLINK_DATA_CNF:
LOG_I(NAS,
"[UE %ld] Received %s: UEid %u, errCode %u\n",
instance,
ITTI_MSG_NAME(msg_p),
NAS_UPLINK_DATA_CNF(msg_p).UEid,
NAS_UPLINK_DATA_CNF(msg_p).errCode);
break;
case NAS_DEREGISTRATION_REQ: {
LOG_I(NAS, "[UE %ld] Received %s\n", instance, ITTI_MSG_NAME(msg_p));
nr_ue_nas_t *nas = get_ue_nas_info(0);
nas_deregistration_req_t *req = &NAS_DEREGISTRATION_REQ(msg_p);
if (nas->guti) {
if (req->cause == AS_DETACH) {
nas->termination_procedure = true;
send_nas_detach_req(instance, true);
}
as_nas_info_t initialNasMsg = {0};
generateDeregistrationRequest(nas, &initialNasMsg, req);
send_nas_uplink_data_req(instance, &initialNasMsg);
} else {
LOG_W(NAS, "No GUTI, cannot trigger deregistration request.\n");
if (req->cause == AS_DETACH)
send_nas_detach_req(instance, false);
}
} break;
case NAS_DOWNLINK_DATA_IND: {
LOG_I(NAS,
"[UE %ld] Received %s: length %u , buffer %p\n",
instance,
ITTI_MSG_NAME(msg_p),
NAS_DOWNLINK_DATA_IND(msg_p).nasMsg.length,
NAS_DOWNLINK_DATA_IND(msg_p).nasMsg.data);
as_nas_info_t initialNasMsg = {0};
uint8_t *pdu_buffer = NAS_DOWNLINK_DATA_IND(msg_p).nasMsg.data;
int msg_type = get_msg_type(pdu_buffer, NAS_DOWNLINK_DATA_IND(msg_p).nasMsg.length);
nr_ue_nas_t *nas = get_ue_nas_info(0);
switch (msg_type) {
case FGS_IDENTITY_REQUEST:
generateIdentityResponse(&initialNasMsg, *(pdu_buffer + 3), nas->uicc);
break;
case FGS_AUTHENTICATION_REQUEST:
generateAuthenticationResp(nas, &initialNasMsg, pdu_buffer);
break;
case FGS_SECURITY_MODE_COMMAND:
nas_itti_kgnb_refresh_req(nas->security.kgnb);
generateSecurityModeComplete(nas, &initialNasMsg);
break;
case FGS_DOWNLINK_NAS_TRANSPORT:
decodeDownlinkNASTransport(&initialNasMsg, pdu_buffer);
break;
case REGISTRATION_ACCEPT:
LOG_I(NAS, "[UE] Received REGISTRATION ACCEPT message\n");
decodeRegistrationAccept(pdu_buffer, NAS_DOWNLINK_DATA_IND(msg_p).nasMsg.length, nas);
as_nas_info_t initialNasMsg = {0};
generateRegistrationComplete(nas, &initialNasMsg, NULL);
if (initialNasMsg.length > 0) {
send_nas_uplink_data_req(instance, &initialNasMsg);
LOG_I(NAS, "Send NAS_UPLINK_DATA_REQ message(RegistrationComplete)\n");
}
const int nssai_idx = get_user_nssai_idx(nas_allowed_nssai, nas);
if (nssai_idx < 0) {
LOG_E(NAS, "NSSAI parameters not match with allowed NSSAI. Couldn't request PDU session.\n");
} else {
request_default_pdusession(instance, nssai_idx);
}
break;
case FGS_DEREGISTRATION_ACCEPT:
LOG_I(NAS, "received deregistration accept\n");
break;
case FGS_PDU_SESSION_ESTABLISHMENT_ACC: {
uint8_t offset = 0;
uint8_t *payload_container = pdu_buffer;
offset += SECURITY_PROTECTED_5GS_NAS_MESSAGE_HEADER_LENGTH;
uint32_t payload_container_length = htons(((dl_nas_transport_t *)(pdu_buffer + offset))->payload_container_length);
if ((payload_container_length >= PAYLOAD_CONTAINER_LENGTH_MIN)
&& (payload_container_length <= PAYLOAD_CONTAINER_LENGTH_MAX))
offset += (PLAIN_5GS_NAS_MESSAGE_HEADER_LENGTH + 3);
if (offset < NAS_CONN_ESTABLI_CNF(msg_p).nasMsg.length)
payload_container = pdu_buffer + offset;
while (offset < payload_container_length) {
if (*(payload_container + offset) == 0x29) { // PDU address IEI
if ((*(payload_container + offset + 1) == 0x05) && (*(payload_container + offset + 2) == 0x01)) { // IPV4
nas_getparams();
sprintf(baseNetAddress, "%d.%d", *(payload_container + offset + 3), *(payload_container + offset + 4));
int third_octet = *(payload_container + offset + 5);
int fourth_octet = *(payload_container + offset + 6);
LOG_I(NAS,
"Received PDU Session Establishment Accept, UE IP: %d.%d.%d.%d\n",
*(payload_container + offset + 3),
*(payload_container + offset + 4),
*(payload_container + offset + 5),
*(payload_container + offset + 6));
nas_config(1, third_octet, fourth_octet, "oaitun_ue");
break;
}
}
offset++;
}
} break;
default:
LOG_W(NR_RRC, "unknown message type %d\n", msg_type);
break;
}
if (initialNasMsg.length > 0)
send_nas_uplink_data_req(instance, &initialNasMsg);
} break;
default:
LOG_E(NAS, "[UE %ld] Received unexpected message %s\n", instance, ITTI_MSG_NAME(msg_p));
break;
}
int result = itti_free(ITTI_MSG_ORIGIN_ID(msg_p), msg_p);
AssertFatal(result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
}
return NULL;
}
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