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Continue to split pdcp_entity_lte and pdcp_entity_nr. Compiling now.

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master
Pedro Alvarez 6 years ago committed by Andre Puschmann
parent bd91678d98
commit 1944bf9a80
7 changed files with 41 additions and 307 deletions
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26
lib/include/srslte/common/interfaces_common.h
Unescape Escape View File

@ -92,6 +92,32 @@ public:
// bool do_rohc;
};
class srslte_pdcp_config_nr_t
{
public:
srslte_pdcp_config_nr_t(uint8_t bearer_id_ = 0,
bool is_control_ = false,
bool is_data_ = false,
uint8_t direction_ = SECURITY_DIRECTION_UPLINK,
uint8_t sn_len_ = 12) :
bearer_id(bearer_id_),
direction(direction_),
is_control(is_control_),
is_data(is_data_),
sn_len(sn_len_)
{
}
uint32_t bearer_id;
uint8_t direction;
bool is_control;
bool is_data;
uint8_t sn_len;
// TODO: Support the following configurations
// bool do_rohc;
};
class mac_interface_timers
{
public:

5
lib/include/srslte/upper/pdcp.h
Unescape Escape View File

@ -29,10 +29,7 @@
namespace srslte {
class pdcp
:public srsue::pdcp_interface_gw
,public srsue::pdcp_interface_rlc
,public srsue::pdcp_interface_rrc
class pdcp : public srsue::pdcp_interface_gw, public srsue::pdcp_interface_rlc, public srsue::pdcp_interface_rrc
{
public:
pdcp(log* log_);

4
lib/include/srslte/upper/pdcp_entity_lte.h
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@ -28,7 +28,7 @@
#include "srslte/interfaces/ue_interfaces.h"
#include "srslte/common/security.h"
#include "srslte/common/threads.h"
#include "pdcp_entity_base.h"
#include "srslte/upper/pdcp_entity_base.h"
namespace srslte {
@ -58,8 +58,6 @@ public:
void reset();
void reestablish();
bool is_active();
// GW/RRC interface
void write_sdu(unique_byte_buffer_t sdu, bool blocking);

3
lib/include/srslte/upper/pdcp_entity_nr.h
Unescape Escape View File

@ -30,7 +30,6 @@
#include "srslte/common/threads.h"
#include "pdcp_entity_base.h"
namespace srslte {
/****************************************************************************
@ -73,6 +72,8 @@ private:
srsue::rrc_interface_pdcp* rrc = nullptr;
srsue::gw_interface_pdcp* gw = nullptr;
srslte_pdcp_config_nr_t cfg;
uint32_t rx_count = 0;
uint32_t tx_count = 0;

4
lib/src/upper/pdcp_entity_lte.cc
Unescape Escape View File

@ -227,7 +227,7 @@ void pdcp_entity_lte::handle_um_drb_pdu(const srslte::unique_byte_buffer_t &pdu)
uint32_t count = (rx_hfn << cfg.sn_len) | sn;
if (do_encryption) {
cipher_decrypt(pdu->msg, count, pdu->N_bytes, pdu->msg);
cipher_decrypt(pdu->msg, pdu->N_bytes, count, cfg.bearer_id, cfg.direction, pdu->msg);
log->debug_hex(pdu->msg, pdu->N_bytes, "RX %s PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
}
@ -289,7 +289,7 @@ void pdcp_entity_lte::handle_am_drb_pdu(const srslte::unique_byte_buffer_t &pdu)
}
// FIXME Check if PDU is not due to re-establishment of lower layers?
cipher_decrypt(pdu->msg, count, pdu->N_bytes, pdu->msg);
cipher_decrypt(pdu->msg, pdu->N_bytes, count, cfg.bearer_id, cfg.direction, pdu->msg);
log->debug_hex(pdu->msg, pdu->N_bytes, "RX %s PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
if (!discard) {

302
lib/src/upper/pdcp_entity_nr.cc
Unescape Escape View File

@ -30,14 +30,14 @@ pdcp_entity_nr::~pdcp_entity_nr() {}
void pdcp_entity_nr::init(srsue::rlc_interface_pdcp* rlc_,
srsue::rrc_interface_pdcp* rrc_,
srsue::sdap_interface_pdcp* sdap_,
srsue::gw_interface_pdcp* gw_,
srslte::log* log_,
uint32_t lcid_,
srslte_pdcp_nr_config_t cfg_)
srslte_pdcp_config_nr_t cfg_)
{
rlc = rlc_;
rrc = rrc_;
sdap = sdap_;
gw = gw_;
log = log_;
lcid = lcid_;
cfg = cfg_;
@ -45,54 +45,14 @@ void pdcp_entity_nr::init(srsue::rlc_interface_pdcp* rlc_,
do_integrity = false;
do_encryption = false;
cfg = cfg_;
// set length of SN field in bytes
sn_len_bytes = (cfg.sn_len == 5) ? 1 : 2;
if (cfg.is_control) {
reordering_window = 0;
} else if (cfg.is_data) {
reordering_window = 2048;
}
rx_hfn = 0;
next_pdcp_rx_sn = 0;
maximum_pdcp_sn = (1 << cfg.sn_len) - 1;
last_submitted_pdcp_rx_sn = maximum_pdcp_sn;
log->info("Init %s with bearer ID: %d\n", rrc->get_rb_name(lcid).c_str(), cfg.bearer_id);
log->info("SN len bits: %d, SN len bytes: %d, reordering window: %d, Maximum SN %d\n",
cfg.sn_len,
sn_len_bytes,
reordering_window,
maximum_pdcp_sn);
// TODO
}
// Reestablishment procedure: 36.323 5.2
void pdcp_entity_nr::reestablish()
{
log->info("Re-establish %s with bearer ID: %d\n", rrc->get_rb_name(lcid).c_str(), cfg.bearer_id);
// For SRBs
if (cfg.is_control) {
tx_count = 0;
rx_count = 0;
rx_hfn = 0;
next_pdcp_rx_sn = 0;
} else {
// Only reset counter in RLC-UM
if (rlc->rb_is_um(lcid)) {
tx_count = 0;
rx_count = 0;
rx_hfn = 0;
next_pdcp_rx_sn = 0;
} else {
tx_count = 0;
rx_count = 0;
rx_hfn = 0;
next_pdcp_rx_sn = 0;
last_submitted_pdcp_rx_sn = maximum_pdcp_sn;
}
}
// For TODO
}
// Used to stop/pause the entity (called on RRC conn release)
@ -112,36 +72,7 @@ void pdcp_entity_nr::write_sdu(unique_byte_buffer_t sdu, bool blocking)
rrc->get_rb_name(lcid).c_str(), tx_count,
(do_integrity) ? "true" : "false", (do_encryption) ? "true" : "false");
pthread_mutex_lock(&mutex);
if (cfg.is_control) {
pdcp_pack_control_pdu(tx_count, sdu.get());
if(do_integrity) {
integrity_generate(sdu->msg,
sdu->N_bytes-4,
&sdu->msg[sdu->N_bytes-4]);
}
}
if (cfg.is_data) {
if(12 == cfg.sn_len) {
pdcp_pack_data_pdu_long_sn(tx_count, sdu.get());
} else {
pdcp_pack_data_pdu_short_sn(tx_count, sdu.get());
}
}
if(do_encryption) {
cipher_encrypt(&sdu->msg[sn_len_bytes],
sdu->N_bytes-sn_len_bytes,
&sdu->msg[sn_len_bytes]);
log->info_hex(sdu->msg, sdu->N_bytes, "TX %s SDU (encrypted)", rrc->get_rb_name(lcid).c_str());
}
tx_count++;
pthread_mutex_unlock(&mutex);
rlc->write_sdu(lcid, std::move(sdu), blocking);
// TODO
}
// RLC interface
@ -155,226 +86,7 @@ void pdcp_entity_nr::write_pdu(unique_byte_buffer_t pdu)
(do_integrity) ? "true" : "false",
(do_encryption) ? "true" : "false");
// Sanity check
if (pdu->N_bytes < sn_len_bytes) {
log->debug("Ignoring PDCP PDU: size=%d, sn_len_bytes=%d\n", pdu->N_bytes, sn_len_bytes);
return;
}
pthread_mutex_lock(&mutex);
if (cfg.is_data) {
// Check PDCP control messages
if ((pdu->msg[0] & 0x80) == 0) {
log->debug("Unhandled PDCP Control PDU\n");
goto exit; // TODO handle PDCP control PDUs
}
// Handle DRB messages
if (rlc->rb_is_um(lcid)) {
handle_um_drb_pdu(pdu);
} else {
handle_am_drb_pdu(pdu);
}
gw->write_pdu(lcid, std::move(pdu));
} else {
// Handle SRB messages
if (cfg.is_control) {
uint32_t sn = *pdu->msg & 0x1F;
if (do_encryption) {
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());
}
if (do_integrity) {
if (not integrity_verify(pdu->msg, 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());
goto exit;
}
}
pdcp_unpack_control_pdu(pdu.get(), &sn);
log->info_hex(pdu->msg, pdu->N_bytes, "RX %s PDU SN: %d", rrc->get_rb_name(lcid).c_str(), sn);
}
// pass to RRC
rrc->write_pdu(lcid, std::move(pdu));
}
exit:
rx_count++;
pthread_mutex_unlock(&mutex);
}
/****************************************************************************
* Rx data/control handler functions
* Ref: 3GPP TS 36.323 v10.1.0 Section 5.1.2
***************************************************************************/
// DRBs mapped on RLC UM (5.1.2.1.3)
void pdcp_entity_nr::handle_um_drb_pdu(const srslte::unique_byte_buffer_t &pdu)
{
uint32_t sn;
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;
if (next_pdcp_rx_sn > maximum_pdcp_sn) {
next_pdcp_rx_sn = 0;
rx_hfn++;
}
log->info_hex(pdu->msg, pdu->N_bytes, "RX %s PDU SN: %d", rrc->get_rb_name(lcid).c_str(), sn);
return;
}
// DRBs mapped on RLC AM, without re-ordering (5.1.2.1.2)
void pdcp_entity_nr::handle_am_drb_pdu(const srslte::unique_byte_buffer_t &pdu)
{
uint32_t sn, count;
pdcp_unpack_data_pdu_long_sn(pdu.get(), &sn);
int32_t last_submit_diff_sn = last_submitted_pdcp_rx_sn - sn;
int32_t sn_diff_last_submit = sn - last_submitted_pdcp_rx_sn;
int32_t sn_diff_next_pdcp_rx_sn = sn - next_pdcp_rx_sn;
log->debug("RX HFN: %d, SN: %d, Last_Submitted_PDCP_RX_SN: %d, Next_PDCP_RX_SN %d\n",
rx_hfn,
sn,
last_submitted_pdcp_rx_sn,
next_pdcp_rx_sn);
bool discard = false;
if ((0 <= sn_diff_last_submit && sn_diff_last_submit > (int32_t)reordering_window) ||
(0 <= last_submit_diff_sn && last_submit_diff_sn < (int32_t)reordering_window)) {
log->debug("|SN - last_submitted_sn| is larger than re-ordering window.\n");
if (sn > next_pdcp_rx_sn) {
count = (rx_hfn - 1) << cfg.sn_len | sn;
} else {
count = rx_hfn << cfg.sn_len | sn;
}
discard = true;
} else if ((int32_t)(next_pdcp_rx_sn - sn) > (int32_t)reordering_window) {
log->debug("(Next_PDCP_RX_SN - SN) is larger than re-ordering window.\n");
rx_hfn++;
count = (rx_hfn << cfg.sn_len) | sn;
next_pdcp_rx_sn = sn + 1;
} else if (sn_diff_next_pdcp_rx_sn >= (int32_t)reordering_window) {
log->debug("(SN - Next_PDCP_RX_SN) is larger or equal than re-ordering window.\n");
count = ((rx_hfn - 1) << cfg.sn_len) | sn;
} else if (sn >= next_pdcp_rx_sn) {
log->debug("SN is larger or equal than Next_PDCP_RX_SN.\n");
count = (rx_hfn << cfg.sn_len) | sn;
next_pdcp_rx_sn = sn + 1;
if (next_pdcp_rx_sn > maximum_pdcp_sn) {
next_pdcp_rx_sn = 0;
rx_hfn++;
}
} else if (sn < next_pdcp_rx_sn) {
log->debug("SN is smaller than Next_PDCP_RX_SN.\n");
count = (rx_hfn << cfg.sn_len) | sn;
}
// FIXME Check if PDU is not due to re-establishment of lower layers?
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());
if (!discard) {
last_submitted_pdcp_rx_sn = sn;
}
return;
}
/****************************************************************************
* Security functions
***************************************************************************/
uint32_t pdcp_entity::get_dl_count()
{
return rx_count;
}
uint32_t pdcp_entity::get_ul_count()
{
return tx_count;
}
/****************************************************************************
* Pack/Unpack helper functions
* Ref: 3GPP TS 38.323 v15.2.0
***************************************************************************/
void pdcp_pack_control_pdu(uint32_t sn, byte_buffer_t *sdu)
{
// Make room and add header
sdu->msg--;
sdu->N_bytes++;
*sdu->msg = sn & 0x1F;
// Pack FMC
sdu->msg[sdu->N_bytes++] = (PDCP_CONTROL_MAC_I >> 24) & 0xFF;
sdu->msg[sdu->N_bytes++] = (PDCP_CONTROL_MAC_I >> 16) & 0xFF;
sdu->msg[sdu->N_bytes++] = (PDCP_CONTROL_MAC_I >> 8) & 0xFF;
sdu->msg[sdu->N_bytes++] = PDCP_CONTROL_MAC_I & 0xFF;
}
void pdcp_unpack_control_pdu(byte_buffer_t *pdu, uint32_t *sn)
{
// Strip header
*sn = *pdu->msg & 0x1F;
pdu->msg++;
pdu->N_bytes--;
// Strip MAC
pdu->N_bytes -= 4;
// TODO: integrity check MAC
}
void pdcp_pack_data_pdu_short_sn(uint32_t sn, byte_buffer_t *sdu)
{
// Make room and add header
sdu->msg--;
sdu->N_bytes++;
sdu->msg[0] = (PDCP_D_C_DATA_PDU << 7) | (sn & 0x7F);
}
void pdcp_unpack_data_pdu_short_sn(byte_buffer_t *sdu, uint32_t *sn)
{
// Strip header
*sn = sdu->msg[0] & 0x7F;
sdu->msg++;
sdu->N_bytes--;
}
void pdcp_pack_data_pdu_long_sn(uint32_t sn, byte_buffer_t *sdu)
{
// Make room and add header
sdu->msg -= 2;
sdu->N_bytes += 2;
sdu->msg[0] = (PDCP_D_C_DATA_PDU << 7) | ((sn >> 8) & 0x0F);
sdu->msg[1] = sn & 0xFF;
}
void pdcp_unpack_data_pdu_long_sn(byte_buffer_t *sdu, uint32_t *sn)
{
// Strip header
*sn = (sdu->msg[0] & 0x0F) << 8;
*sn |= sdu->msg[1];
sdu->msg += 2;
sdu->N_bytes -= 2;
// TODO
}
}

4
srsue/test/upper/nas_test.cc
Unescape Escape View File

@ -23,7 +23,7 @@
#include "srslte/common/log_filter.h"
#include "srslte/interfaces/ue_interfaces.h"
#include "srslte/upper/pdcp.h"
#include "srslte/upper/pdcp_entity.h"
#include "srslte/upper/pdcp_entity_lte.h"
#include "srslte/upper/rlc.h"
#include "srsue/hdr/stack/mac/mac.h"
#include "srsue/hdr/stack/rrc/rrc.h"
@ -90,7 +90,7 @@ public:
void write_pdu_mch(uint32_t lcid, srslte::unique_byte_buffer_t sdu) {}
std::string get_rb_name(uint32_t lcid) { return std::string("lcid"); }
void write_sdu(uint32_t lcid, srslte::unique_byte_buffer_t sdu, bool blocking) {}
bool is_lcid_enabled(uint32_t lcid) { return false; }
bool is_lcid_enabled(uint32_t lcid) { return false; }
};
class rrc_dummy : public rrc_interface_nas

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