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GTPU: basic support of DL USER DATA

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See 3GPP TS 38.425 5.5.2.1.

Only sending part, only dealing with NR-U Sequence Number.
This commit is contained in:
Cedric Roux
2025-07-25 16:32:50 +02:00
committed by Robert Schmidt
parent c35f07b0b9
commit 84ce708f96
2 changed files with 46 additions and 0 deletions
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30
openair3/ocp-gtpu/gtpu_extensions.c
View File

@@ -40,6 +40,7 @@ int serialize_gtpu_extension_type(gtpu_extension_header_type_t type)
case GTPU_EXT_UL_PDU_SESSION_INFORMATION:
return PDU_SESSION_CONTAINER;
case GTPU_EXT_DL_DATA_DELIVERY_STATUS:
case GTPU_EXT_DL_USER_DATA:
return NR_RAN_CONTAINER;
default:
AssertFatal(0, "unknown GTPU extension type %d\n", type);
@@ -92,6 +93,31 @@ static int serialize_dl_data_delivery_status(byte_array_producer_t *b, dl_data_d
return 1;
}
/* returns 0 on error, 1 on success */
static int serialize_dl_user_data(byte_array_producer_t *b, dl_user_data_t *ext)
{
/* see 38.425 5.5.2.1 */
AssertFatal(!ext->dl_discard_blocks && !ext->dl_flush && !ext->report_polling
&& !ext->request_out_of_seq_report && !ext->report_delivered
&& !ext->user_data_existence_flag && !ext->assistance_info_report_polling_flag
&& !ext->retransmission_flag,
"todo\n");
uint8_t b1 = (0 << 4) | (ext->dl_discard_blocks << 2) | (ext->dl_flush << 1) | ext->report_polling;
uint8_t b2 = (ext->request_out_of_seq_report << 4)
| (ext->report_delivered << 3)
| (ext->user_data_existence_flag << 2)
| (ext->assistance_info_report_polling_flag << 1)
| ext->retransmission_flag;
if (!byte_array_producer_put_byte(b, b1) || !byte_array_producer_put_byte(b, b2))
return 0;
if (!byte_array_producer_put_u24_be(b, ext->nru_sequence_number))
return 0;
return 1;
}
/* returns -1 on error, number of serialized bytes on success */
int serialize_extension(gtpu_extension_header_t *ext, gtpu_extension_header_type_t next, uint8_t *out_buf, int out_len)
{
@@ -111,6 +137,10 @@ int serialize_extension(gtpu_extension_header_t *ext, gtpu_extension_header_type
if (!serialize_dl_data_delivery_status(&b, &ext->dl_data_delivery_status))
goto error;
break;
case GTPU_EXT_DL_USER_DATA:
if (!serialize_dl_user_data(&b, &ext->dl_user_data))
goto error;
break;
default:
LOG_E(GTPU, "unknown extension type %d\n", ext->type);
return -1;

16
openair3/ocp-gtpu/gtpu_extensions.h
View File

@@ -31,6 +31,7 @@ typedef enum {
GTPU_EXT_UL_PDU_SESSION_INFORMATION,
/* 38.425 */
GTPU_EXT_DL_DATA_DELIVERY_STATUS,
GTPU_EXT_DL_USER_DATA,
} gtpu_extension_header_type_t;
/* 38.415 */
@@ -61,11 +62,26 @@ typedef struct {
uint32_t highest_transmitted_nr_pdcp_sn;
} dl_data_delivery_status_t;
/* 38.425 */
typedef struct {
/* not all fields are present, to be refined if needed */
bool dl_discard_blocks;
bool dl_flush;
bool report_polling;
bool request_out_of_seq_report;
bool report_delivered;
bool user_data_existence_flag;
bool assistance_info_report_polling_flag;
bool retransmission_flag;
uint32_t nru_sequence_number;
} dl_user_data_t;
typedef struct {
gtpu_extension_header_type_t type;
union {
ul_pdu_session_information_t ul_pdu_session_information;
dl_data_delivery_status_t dl_data_delivery_status;
dl_user_data_t dl_user_data;
};
} gtpu_extension_header_t;