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lib,pdcp_nr: fixed up some comments and a logging message

This commit is contained in:
Pedro Alvarez 2022-06-02 17:17:36 +01:00
parent 540483ba9e
commit 0f1c8b03c7
1 changed files with 29 additions and 19 deletions
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48
lib/src/pdcp/pdcp_entity_nr.cc
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@ -199,15 +199,16 @@ void pdcp_entity_nr::write_pdu(unique_byte_buffer_t pdu)
// Extract RCVD_SN from header
uint32_t rcvd_sn = read_data_header(pdu);
// Calculate RCVD_COUNT
/*
*- if RCVD_SN < SN(RX_DELIV) – Window_Size:
* - RCVD_HFN = HFN(RX_DELIV) + 1.
*- else if RCVD_SN >= SN(RX_DELIV) + Window_Size:
* - RCVD_HFN = HFN(RX_DELIV) – 1.
*- else:
* - RCVD_HFN = HFN(RX_DELIV);
*- RCVD_COUNT = [RCVD_HFN, RCVD_SN].
* Calculate RCVD_COUNT:
*
* - if RCVD_SN < SN(RX_DELIV) – Window_Size:
* - RCVD_HFN = HFN(RX_DELIV) + 1.
* - else if RCVD_SN >= SN(RX_DELIV) + Window_Size:
* - RCVD_HFN = HFN(RX_DELIV) – 1.
* - else:
* - RCVD_HFN = HFN(RX_DELIV);
* - RCVD_COUNT = [RCVD_HFN, RCVD_SN].
*/
uint32_t rcvd_hfn, rcvd_count;
if ((int64_t)rcvd_sn < (int64_t)SN(rx_deliv) - (int64_t)window_size) {
@ -221,25 +222,33 @@ void pdcp_entity_nr::write_pdu(unique_byte_buffer_t pdu)
logger.debug("Estimated RCVD_HFN=%u, RCVD_SN=%u, RCVD_COUNT=%u", rcvd_hfn, rcvd_sn, rcvd_count);
// TS 38.323, section 5.8: Deciphering
// The data unit that is ciphered is the MAC-I and the
// data part of the PDCP Data PDU except the
// SDAP header and the SDAP Control PDU if included in the PDCP SDU.
/*
* TS 38.323, section 5.8: Deciphering
*
* The data unit that is ciphered is the MAC-I and the
* data part of the PDCP Data PDU except the
* SDAP header and the SDAP Control PDU if included in the PDCP SDU.
*/
if (encryption_direction == DIRECTION_RX || encryption_direction == DIRECTION_TXRX) {
cipher_decrypt(
&pdu->msg[cfg.hdr_len_bytes], pdu->N_bytes - cfg.hdr_len_bytes, rcvd_count, &pdu->msg[cfg.hdr_len_bytes]);
}
// Extract MAC-I
// Always extract from SRBs, only extract from DRBs if integrity is enabled
/*
* Extract MAC-I:
* Always extract from SRBs, only extract from DRBs if integrity is enabled
*/
uint8_t mac[4] = {};
if (is_srb() || (is_drb() && (integrity_direction == DIRECTION_TX || integrity_direction == DIRECTION_TXRX))) {
extract_mac(pdu, mac);
}
// TS 38.323, section 5.9: Integrity verification
// The data unit that is integrity protected is the PDU header
// and the data part of the PDU before ciphering.
/*
* TS 38.323, section 5.9: Integrity verification
*
* The data unit that is integrity protected is the PDU header
* and the data part of the PDU before ciphering.
*/
if (integrity_direction == DIRECTION_TX || integrity_direction == DIRECTION_TXRX) {
bool is_valid = integrity_verify(pdu->msg, pdu->N_bytes, rcvd_count, mac);
if (!is_valid) {
@ -254,8 +263,9 @@ void pdcp_entity_nr::write_pdu(unique_byte_buffer_t pdu)
// After checking the integrity, we can discard the header.
discard_data_header(pdu);
// Check valid rcvd_count
/*
* Check valid rcvd_count:
*
* - if RCVD_COUNT < RX_DELIV; or
* - if the PDCP Data PDU with COUNT = RCVD_COUNT has been received before:
* - discard the PDCP Data PDU;
@ -268,7 +278,7 @@ void pdcp_entity_nr::write_pdu(unique_byte_buffer_t pdu)
// Check if PDU has been received
if (reorder_queue.find(rcvd_count) != reorder_queue.end()) {
logger.debug("Duplicate PDU, dropping.");
logger.debug("Duplicate PDU, dropping");
return; // PDU already present, drop.
}