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Refactor generateServiceRequest

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* simplified code, reduced conditional statements, reduced number of pointers
This commit is contained in:
Guido Casati
2025-01-30 15:21:39 +01:00
parent 2c5309f0f8
commit b07ddb1e57
1 changed files with 24 additions and 26 deletions
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openair3/NAS/NR_UE/nr_nas_msg.c
+24 -26
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@@ -491,29 +491,13 @@ void generateServiceRequest(as_nas_info_t *initialNasMsg, nr_ue_nas_t *nas)
// NAS is security protected if has valid security contexts
bool security_protected = nas->security_container->ciphering_context && nas->security_container->integrity_context;
// Set 5GMM plain header
fgmm_nas_message_plain_t plain = {0};
fgs_service_request_msg_t *mm_msg;
fgmm_nas_msg_security_protected_t sp = {0};
fgmm_msg_header_t mm_header = set_mm_header(FGS_SERVICE_REQUEST, PLAIN_5GS_MSG);
if (security_protected) {
/* Set security protected 5GS NAS message header (see 9.1.1 of 3GPP TS 24.501) */
sp.header.protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
sp.header.security_header_type = INTEGRITY_PROTECTED;
sp.header.sequence_number = nas->security.nas_count_ul & 0xff;
size += sizeof(fgs_nas_message_security_header_t);
mm_msg = &sp.plain.mm_msg.service_request;
// Plain 5GMM header
sp.plain.header = mm_header;
} else {
// Set Mobility Management plain message header
mm_msg = &plain.mm_msg.service_request;
// Plain 5GMM header
plain.header = mm_header;
}
size += sizeof(mm_header);
// Fill Service Request
plain.header = set_mm_header(FGS_SERVICE_REQUEST, PLAIN_5GS_MSG);
size += sizeof(plain.header);
// Set plain FGMM Service Request
fgs_service_request_msg_t *mm_msg = &plain.mm_msg.service_request;
// Service Type
mm_msg->serviceType = SERVICE_TYPE_DATA;
// NAS key set identifier
@@ -523,9 +507,21 @@ void generateServiceRequest(as_nas_info_t *initialNasMsg, nr_ue_nas_t *nas)
// 5G-S-TMSI
size += fill_fgstmsi(&mm_msg->fiveg_s_tmsi, nas->guti);
/* message encoding */
initialNasMsg->nas_data = malloc_or_fail(size * sizeof(*initialNasMsg->nas_data));
if (security_protected) {
fgmm_nas_msg_security_protected_t sp = {0};
// Set security protected 5GS NAS message header (see 9.1.1 of 3GPP TS 24.501)
sp.header.protocol_discriminator = FGS_MOBILITY_MANAGEMENT_MESSAGE;
sp.header.security_header_type = INTEGRITY_PROTECTED;
sp.header.sequence_number = nas->security.nas_count_ul & 0xff;
size += sizeof(sp.header);
// Payload: plain message
sp.plain = plain;
// Allocate NAS message for encoding
initialNasMsg->nas_data = malloc_or_fail(size * sizeof(*initialNasMsg->nas_data));
// security protected encoding
int security_header_len = nas_protected_security_header_encode(initialNasMsg->nas_data, &sp.header, size);
initialNasMsg->length =
@@ -554,12 +550,14 @@ void generateServiceRequest(as_nas_info_t *initialNasMsg, nr_ue_nas_t *nas)
/* length in bits */
stream_cipher.blength = (initialNasMsg->length - 6) << 3;
stream_compute_integrity(nas->security_container->integrity_algorithm, &stream_cipher, mac);
printf("Integrity protected initial NAS message: mac = %x %x %x %x \n", mac[0], mac[1], mac[2], mac[3]);
LOG_D(NAS, "Integrity protected initial NAS message: mac = %x %x %x %x \n", mac[0], mac[1], mac[2], mac[3]);
for (int i = 0; i < 4; i++)
initialNasMsg->nas_data[2 + i] = mac[i];
} else {
// plain encoding
initialNasMsg->length = mm_msg_encode(&plain, (uint8_t *)(initialNasMsg->nas_data), size);
// Allocate NAS message for encoding
initialNasMsg->nas_data = malloc_or_fail(size * sizeof(*initialNasMsg->nas_data));
initialNasMsg->length = mm_msg_encode(&plain, initialNasMsg->nas_data, size);
LOG_I(NAS, "PLAIN_5GS_MSG initial NAS message: Service Request with length %d \n", initialNasMsg->length);
}
}