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srsRAN_4G
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Starting to use received SN to do user plane decription.

Browse Source
master
Pedro Alvarez 6 years ago committed by Andre Puschmann
parent 09144a2c5f
commit 6cbcc5154d
2 changed files with 30 additions and 15 deletions
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3
lib/include/srslte/upper/pdcp_entity.h
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@ -107,6 +107,9 @@ private:
uint8_t k_rrc_int[32];
uint8_t k_up_enc[32];
uint32_t rx_hfn;
uint32_t next_pdcp_rx_sn;
CIPHERING_ALGORITHM_ID_ENUM cipher_algo;
INTEGRITY_ALGORITHM_ID_ENUM integ_algo;

42
lib/src/upper/pdcp_entity.cc
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@ -37,7 +37,10 @@ pdcp_entity::pdcp_entity()
sn_len_bytes = 0;
do_integrity = false;
do_encryption = false;
tx_count = 0;
rx_count = 0;
rx_hfn = 0;
next_pdcp_rx_sn = 0;
cipher_algo = CIPHERING_ALGORITHM_ID_EEA0;
integ_algo = INTEGRITY_ALGORITHM_ID_EIA0;
pthread_mutex_init(&mutex, NULL);
@ -79,11 +82,13 @@ void pdcp_entity::reestablish()
// For SRBs
if (cfg.is_control) {
tx_count = 0;
rx_hfn = 0;
rx_count = 0;
} else {
// Only reset counter in RLC-UM
if (rlc->rb_is_um(lcid)) {
tx_count = 0;
rx_hfn = 0;
rx_count = 0;
}
}
@ -187,31 +192,38 @@ void pdcp_entity::write_pdu(unique_byte_buffer_t pdu)
pthread_mutex_lock(&mutex);
// Handle DRB messages
if (cfg.is_data) {
// Handle DRB messages
uint32_t sn;
if (do_encryption) {
cipher_decrypt(&(pdu->msg[sn_len_bytes]),
rx_count,
pdu->N_bytes - sn_len_bytes,
&(pdu->msg[sn_len_bytes]));
log->debug_hex(pdu->msg, pdu->N_bytes, "RX %s PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
}
if(12 == cfg.sn_len)
{
if (12 == cfg.sn_len) {
pdcp_unpack_data_pdu_long_sn(pdu.get(), &sn);
} else {
pdcp_unpack_data_pdu_short_sn(pdu.get(), &sn);
}
if (sn < next_pdcp_rx_sn) {
rx_hfn++;
}
uint32_t count = (rx_hfn << cfg.sn_len) | sn;
if (do_encryption) {
cipher_decrypt(pdu->msg,
count,
pdu->N_bytes,
pdu->msg);
log->debug_hex(pdu->msg, pdu->N_bytes, "RX %s PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
}
next_pdcp_rx_sn = sn + 1;
log->info_hex(pdu->msg, pdu->N_bytes, "RX %s PDU SN: %d", rrc->get_rb_name(lcid).c_str(), sn);
gw->write_pdu(lcid, std::move(pdu));
} else {
// Handle SRB messages
if (cfg.is_control) {
uint32_t sn = 0;
uint32_t sn = *pdu->msg & 0x1F;
if (do_encryption) {
cipher_decrypt(&(pdu->msg[sn_len_bytes]),
rx_count,
cipher_decrypt(&pdu->msg[sn_len_bytes],
sn,
pdu->N_bytes - sn_len_bytes,
&(pdu->msg[sn_len_bytes]));
log->info_hex(pdu->msg, pdu->N_bytes, "RX %s PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
@ -219,7 +231,7 @@ void pdcp_entity::write_pdu(unique_byte_buffer_t pdu)
if (do_integrity) {
if (not integrity_verify(pdu->msg,
rx_count,
sn,
pdu->N_bytes - 4,
&(pdu->msg[pdu->N_bytes - 4]))) {
log->error_hex(pdu->msg, pdu->N_bytes, "%s Dropping PDU", rrc->get_rb_name(lcid).c_str());
@ -400,7 +412,7 @@ void pdcp_entity::cipher_decrypt(uint8_t *ct,
} else {
k_enc = k_up_enc;
}
log->info("Ciphering count %d \n", count);
switch(cipher_algo)
{
case CIPHERING_ALGORITHM_ID_EEA0:

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