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7b5ffa4d46
Author | SHA1 | Date | |
---|---|---|---|
Théophile Bastian | 7b5ffa4d46 | ||
Théophile Bastian | 15f9625a6d |
1
Makefile
1
Makefile
|
@ -7,6 +7,7 @@ OBJS= \
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VpnPeer.o \
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VpnPacket.o \
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TunDevice.o \
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congestion_control.o \
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ip_header.o util.o main.o
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TARGET=congestvpn
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19
UdpVpn.cpp
19
UdpVpn.cpp
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@ -195,6 +195,10 @@ void UdpVpn::receive_from_udp() {
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tlv.seek_next_tlv())
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{
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switch(tlv.get_type()) {
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case VpnPacketTLV::PAYLOAD_TYPE_LOSS_REPORT:
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if(_peer)
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_peer->log_loss_report(VpnTlvLossReport(tlv));
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break;
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case VpnPacketTLV::PAYLOAD_TYPE_RTTQ:
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if(_peer)
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_peer->make_rtta_for(VpnTlvRTTQ(tlv));
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@ -233,9 +237,19 @@ void UdpVpn::receive_tunnelled_tlv(VpnDataPacket& packet) {
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}
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void UdpVpn::dump_state() const {
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if(!_peer) {
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printf("===== Cannot dump state, no peer yet =====\n");
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return;
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}
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const CongestionController& congest_ctrl =
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_peer->get_congestion_controller();
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printf("====== State dump ======\n");
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printf("Packet loss rate: %.0lf%%\n",
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printf("Packet loss rate (inbound): %.0lf%%\n",
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round(_peer->get_loss_logger().get_loss_rate() * 100));
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printf("Packet loss rate (outbound): %.0lf%%\n",
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round(_peer->get_loss_reports().loss_rate() * 100));
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printf("RTT: %.02lf ms avg, %.02lf ms last [last updated: %lu ms ago]\n",
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(double)_peer->get_rtt().avg_rtt() / 1e3,
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(double)_peer->get_rtt().cur_rtt() / 1e3,
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@ -243,5 +257,8 @@ void UdpVpn::dump_state() const {
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std::chrono::steady_clock::now()
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- _peer->get_rtt().get_last_update()).count()
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);
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printf("Available bandwidth:\n\t%s [loss based controller]\n",
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human_readable_unit(congest_ctrl.get_lossbased_bandwidth(), "B")
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);
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printf("==== End state dump ====\n");
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}
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@ -178,6 +178,36 @@ void VpnPacketTLV::set_type(VpnPacketTLV::PayloadType type) {
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*(uint8_t*)(get_data()) = (uint8_t) type;
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}
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/* ========== VpnTlvLossReport ========== */
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const uint32_t VpnTlvLossReport::REP_SEQNO_POS = 0,
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VpnTlvLossReport::REP_LOSS_POS = 4;
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VpnTlvLossReport::VpnTlvLossReport(
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VpnControlPacket& packet, size_t payload_offset)
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: VpnPacketTLV(packet, payload_offset) {}
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VpnTlvLossReport::VpnTlvLossReport(const VpnPacketTLV& other)
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: VpnPacketTLV(other) {}
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VpnTlvLossReport VpnTlvLossReport::create(VpnControlPacket& packet) {
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VpnTlvLossReport tlv =
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VpnPacketTLV::create(packet, VpnPacketTLV::PAYLOAD_TYPE_LOSS_REPORT);
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tlv.set_payload_size(8);
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memset(tlv.get_payload(), 0, 8);
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return tlv;
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}
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uint32_t VpnTlvLossReport::get_report_seqno() const {
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return ntohl(*(uint32_t*)(get_payload() + REP_SEQNO_POS));
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}
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void VpnTlvLossReport::set_report_seqno(uint32_t seqno) {
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*(uint32_t*)(get_payload() + REP_SEQNO_POS) = htonl(seqno);
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}
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uint32_t VpnTlvLossReport::get_losses() const {
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return ntohl(*(uint32_t*)(get_payload() + REP_LOSS_POS));
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}
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void VpnTlvLossReport::set_losses(uint32_t losses) {
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*(uint32_t*)(get_payload() + REP_LOSS_POS) = htonl(losses);
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}
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/* ========== VpnTlvRTTQ ========== */
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VpnTlvRTTQ::VpnTlvRTTQ(VpnControlPacket& packet, size_t payload_offset)
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@ -178,7 +178,7 @@ class VpnPacketTLV {
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enum PayloadType {
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PAYLOAD_TYPE_UNDEF, ///< Undefined packet type
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PAYLOAD_TYPE_RR, ///< Receiver report
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PAYLOAD_TYPE_LOSS_REPORT, ///< Loss report
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PAYLOAD_TYPE_REMB, ///< Receiver Estimated Maximum Bitrate
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PAYLOAD_TYPE_RTTQ, ///< RTT update query
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PAYLOAD_TYPE_RTTA, ///< RTT update answer
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@ -246,6 +246,23 @@ class VpnPacketTLV {
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size_t _tlv_pos;
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};
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class VpnTlvLossReport: public VpnPacketTLV {
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public:
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VpnTlvLossReport(VpnControlPacket& packet, size_t payload_offset);
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VpnTlvLossReport(const VpnPacketTLV& other);
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static VpnTlvLossReport create(VpnControlPacket& packet);
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uint32_t get_report_seqno() const;
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void set_report_seqno(uint32_t seqno);
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uint32_t get_losses() const;
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void set_losses(uint32_t losses);
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private:
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static const uint32_t REP_SEQNO_POS, REP_LOSS_POS;
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};
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class VpnTlvRTTQ: public VpnPacketTLV {
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public:
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VpnTlvRTTQ(VpnControlPacket& packet, size_t payload_offset);
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60
VpnPeer.cpp
60
VpnPeer.cpp
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@ -1,5 +1,5 @@
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#include "VpnPeer.hpp"
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#include "UdpVpn.hpp"
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#include "congestion_control.hpp"
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#include <cstdint>
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#include <cstring>
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@ -10,11 +10,18 @@ const unsigned int RTTLogger::BASE_UPDATE_DELAY = 1000; // ms
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VpnPeer::VpnPeer(UdpVpn* vpn, const sockaddr_in6& ext_addr,
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const in6_addr& int_addr)
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: _vpn(vpn), _ext_addr(ext_addr), _int_addr(int_addr), _next_send_seqno(0)
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: _vpn(vpn), _ext_addr(ext_addr), _int_addr(int_addr), _next_send_seqno(0),
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_congestion_controller(*this)
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{
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cycle_next_control();
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}
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void VpnPeer::make_loss_report() {
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VpnTlvLossReport report = VpnTlvLossReport::create(*_next_control_packet);
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report.set_report_seqno(_packet_loss.get_cur_seqno());
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report.set_losses(_packet_loss.get_tot_losses());
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}
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void VpnPeer::cycle_next_control() {
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_next_control_packet =
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std::make_unique<VpnControlPacket>(_vpn->get_mtu(), false);
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@ -25,6 +32,16 @@ void VpnPeer::set_int_addr(const in6_addr& int_addr) {
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memcpy(&_int_addr, &int_addr, sizeof(_int_addr));
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}
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void VpnPeer::log_loss_report(const VpnTlvLossReport& loss_rep) {
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_loss_reports.prev_seqno = _loss_reports.last_seqno;
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_loss_reports.prev_losses = _loss_reports.last_losses;
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_loss_reports.last_seqno = loss_rep.get_report_seqno();
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_loss_reports.last_losses = loss_rep.get_losses();
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_congestion_controller.update_lossbased();
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}
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size_t VpnPeer::write(const char* data, size_t len) {
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ssize_t nsent;
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@ -45,8 +62,10 @@ void VpnPeer::got_inbound_packet(const VpnPacket& packet) {
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}
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bool VpnPeer::send_control_packet() {
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if(_rtt.update_due(!_next_control_packet->is_empty()))
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if(_rtt.update_due(!_next_control_packet->is_empty())) {
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VpnTlvRTTQ::create(*_next_control_packet);
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make_loss_report();
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}
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if(!_next_control_packet->is_empty()) {
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_next_control_packet->prepare_for_sending();
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@ -63,44 +82,57 @@ void VpnPeer::make_rtta_for(const VpnTlvRTTQ& rttq) {
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rtta.set_recv_ts(rttq.get_packet().get_reception_timestamp());
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}
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PacketLossLogger::PacketLossLogger() : _cur_seqno(0) {}
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PacketLossLogger::PacketLossLogger() :
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_cur_seqno(0), _tot_losses(0), _last_window_losses(0), _win_start_losses(0)
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{}
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void PacketLossLogger::log_packet(uint32_t seqno) {
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uint32_t m_seqno = seqno % PACKET_LOSS_HISTSIZE;
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int64_t diff = (int64_t)seqno - _cur_seqno;
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if(diff == 1) {
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_cur_seqno++;
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_packet_loss_hist.reset(m_seqno);
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maybe_start_window();
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while(_received_ahead.test((_cur_seqno + 1) % PACKET_LOST_AFTER)) {
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_cur_seqno++;
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_packet_loss_hist.reset(_cur_seqno % PACKET_LOSS_HISTSIZE);
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_received_ahead.reset(_cur_seqno % PACKET_LOST_AFTER);
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maybe_start_window();
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}
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} else if(LIKELY(diff > 1)) {
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if(diff < PACKET_LOST_AFTER)
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_received_ahead.set(seqno % PACKET_LOST_AFTER);
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else if(diff < PACKET_LOSS_HISTSIZE) {
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else if(diff < PACKET_LOSS_WINDOW) {
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// Packet too much forwards -- consider _cur_seqno lost
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for(int offs=1; offs < PACKET_LOST_AFTER; ++offs) {
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_packet_loss_hist[(_cur_seqno + offs) % PACKET_LOSS_HISTSIZE] =
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!_received_ahead[(_cur_seqno + offs) % PACKET_LOST_AFTER];
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if(_cur_seqno % PACKET_LOSS_WINDOW > seqno % PACKET_LOSS_WINDOW) {
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// This loss crosses a window border
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for(int offs=0; offs < PACKET_LOST_AFTER; ++offs) {
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maybe_start_window(offs);
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if(!_received_ahead[(_cur_seqno + offs) % PACKET_LOST_AFTER])
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_tot_losses++;
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}
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} else {
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_tot_losses += PACKET_LOST_AFTER - _received_ahead.count();
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}
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_received_ahead.reset();
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_cur_seqno = seqno;
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_packet_loss_hist.reset(m_seqno);
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} else
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reboot(); // This is a huge gap -- reboot
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} else {
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if(diff < - 2*PACKET_LOSS_HISTSIZE)
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if(diff < - 2*PACKET_LOSS_WINDOW)
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reboot(); // this is too much backwards -- something's wrong, reboot
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// else: ignore, we've moved forward and counted the packet as lost
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}
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}
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void PacketLossLogger::reboot() {
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_packet_loss_hist.reset();
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_received_ahead.reset();
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// _tot_losses unchanged
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}
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void PacketLossLogger::maybe_start_window(int offs) {
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if(_cur_seqno + offs % PACKET_LOSS_WINDOW == 0) {
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_last_window_losses = _win_start_losses;
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_win_start_losses = _tot_losses;
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}
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}
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RTTLogger::RTTLogger() :
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41
VpnPeer.hpp
41
VpnPeer.hpp
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@ -7,21 +7,19 @@
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#include <chrono>
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#include "util.hpp"
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#include "VpnPacket.hpp"
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#include "congestion_control.hpp"
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class UdpVpn;
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const int PACKET_LOSS_HISTSIZE = 128, PACKET_LOST_AFTER = 8;
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const int PACKET_LOSS_WINDOW = 128, PACKET_LOST_AFTER = 8;
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class PacketLossLogger {
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public:
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PacketLossLogger();
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void log_packet(uint32_t seqno);
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double get_loss_rate() const {
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return (double)_packet_loss_hist.count() / PACKET_LOSS_HISTSIZE;
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}
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const std::bitset<PACKET_LOSS_HISTSIZE> get_loss_hist() const {
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return _packet_loss_hist;
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return (double)(_win_start_losses - _last_window_losses)
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/ (double)PACKET_LOSS_WINDOW;
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}
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const std::bitset<PACKET_LOST_AFTER> get_received_ahead() const {
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@ -29,13 +27,18 @@ class PacketLossLogger {
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}
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uint32_t get_cur_seqno() const { return _cur_seqno; }
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unsigned int get_tot_losses() const { return _tot_losses; }
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private:
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void reboot(); ///< completely reset the internal state
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std::bitset<PACKET_LOSS_HISTSIZE> _packet_loss_hist;
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/// roll loss window values if `_cur_seqno + offs` is a window start.
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void maybe_start_window(int offs=0);
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std::bitset<PACKET_LOST_AFTER> _received_ahead;
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uint32_t _cur_seqno;
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unsigned int _tot_losses;
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unsigned int _last_window_losses, _win_start_losses;
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};
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/** Round-trip time logger. All timestamps/delays are in microseconds. */
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@ -75,6 +78,17 @@ class VpnPeer {
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: MsgException(msg, code, is_perror) {}
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};
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/// Logs the loss reports sent by the remote peer
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struct LossReports {
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uint32_t prev_seqno, last_seqno;
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uint32_t prev_losses, last_losses;
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double loss_rate() const {
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return (double)(last_losses - prev_losses)
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/ (double)(last_seqno - prev_seqno);
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}
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};
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VpnPeer(UdpVpn* vpn, const sockaddr_in6& ext_addr,
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const in6_addr& int_addr);
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@ -83,10 +97,14 @@ class VpnPeer {
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void set_int_addr(const in6_addr& int_addr);
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const PacketLossLogger& get_loss_logger() { return _packet_loss; }
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const RTTLogger& get_rtt() { return _rtt; }
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const PacketLossLogger& get_loss_logger() const { return _packet_loss; }
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const RTTLogger& get_rtt() const { return _rtt; }
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const LossReports& get_loss_reports() const { return _loss_reports; }
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const CongestionController& get_congestion_controller() const {
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return _congestion_controller; }
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void log_rtta(const VpnTlvRTTA& rtta) { _rtt.log(rtta); }
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void log_loss_report(const VpnTlvLossReport& loss_rep);
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size_t write(const char* data, size_t len);
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size_t write(const VpnPacket& packet);
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@ -104,7 +122,8 @@ class VpnPeer {
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void make_rtta_for(const VpnTlvRTTQ& rttq);
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private: // meth
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void cycle_next_control(); /// Generate a fresh next control packet
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void make_loss_report(); ///< Add a loss report to the next control packet
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void cycle_next_control(); ///< Generate a fresh next control packet
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private:
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UdpVpn* _vpn;
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|
@ -113,7 +132,9 @@ class VpnPeer {
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uint32_t _next_send_seqno;
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PacketLossLogger _packet_loss;
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LossReports _loss_reports;
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RTTLogger _rtt;
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CongestionController _congestion_controller;
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std::unique_ptr<VpnControlPacket> _next_control_packet;
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};
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|
|
27
congestion_control.cpp
Normal file
27
congestion_control.cpp
Normal file
|
@ -0,0 +1,27 @@
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#include "congestion_control.hpp"
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#include "VpnPeer.hpp"
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CongestionController::CongestionController(const VpnPeer& peer):
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_peer(peer)
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{
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_last_seqno = _peer.get_loss_logger().get_cur_seqno();
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_loss_based.bandwidth = 3e5; // 300kBps seems a good value to start with
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}
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void CongestionController::update_lossbased() {
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const VpnPeer::LossReports& loss_rep = _peer.get_loss_reports();
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uint32_t delta_seqno = loss_rep.last_seqno - loss_rep.prev_seqno;
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unsigned int delta_losses = loss_rep.last_losses - loss_rep.prev_losses;
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double loss_rate = (double)delta_losses / (double)delta_seqno;
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if(loss_rate < 0.02) // FIXME only if the bandwidth is used
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_loss_based.bandwidth *= 1.05;
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else if(loss_rate >= 0.1)
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_loss_based.bandwidth *= (1 - 0.5 * loss_rate);
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}
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uint64_t CongestionController::get_bandwidth() const {
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return _loss_based.bandwidth;
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}
|
28
congestion_control.hpp
Normal file
28
congestion_control.hpp
Normal file
|
@ -0,0 +1,28 @@
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#pragma once
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#include <stdint.h>
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|
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class VpnPeer;
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class CongestionController {
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public:
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struct LossBased {
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uint64_t bandwidth; // bytes per second
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};
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CongestionController(const VpnPeer& peer);
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|
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const VpnPeer& get_peer() const { return _peer; }
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void update_lossbased();
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uint64_t get_bandwidth() const;
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uint64_t get_lossbased_bandwidth() const {
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return _loss_based.bandwidth; }
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|
||||
private:
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const VpnPeer& _peer;
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|
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LossBased _loss_based;
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uint32_t _last_seqno; // seqno at the last update time
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};
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|
|
@ -1,48 +0,0 @@
|
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#include <cstdio>
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#include <vector>
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#include "VpnPeer.hpp"
|
||||
|
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template<int len>
|
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std::string bitset_to_string(
|
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const std::bitset<len>& bs,
|
||||
char c_f, char c_t, size_t mark_pos, char cm_f, char cm_t)
|
||||
{
|
||||
std::string out;
|
||||
for(size_t pos=0; pos < len; ++pos) {
|
||||
if(pos == mark_pos)
|
||||
out += bs[pos] ? cm_t : cm_f;
|
||||
else
|
||||
out += bs[pos] ? c_t : c_f;
|
||||
}
|
||||
return out;
|
||||
}
|
||||
|
||||
void dump(PacketLossLogger& pllog, int received) {
|
||||
printf("%03d, %.03lf ## %s ## %s\n",
|
||||
received,
|
||||
pllog.get_loss_rate(),
|
||||
bitset_to_string<PACKET_LOSS_HISTSIZE>(
|
||||
pllog.get_loss_hist(), '_', 'X',
|
||||
pllog.get_cur_seqno() % PACKET_LOSS_HISTSIZE,
|
||||
'|', '#').c_str(),
|
||||
bitset_to_string<PACKET_LOST_AFTER>(
|
||||
pllog.get_received_ahead(), '_', 'X',
|
||||
pllog.get_cur_seqno() % PACKET_LOST_AFTER,
|
||||
'|', '#').c_str());
|
||||
}
|
||||
|
||||
int main(void) {
|
||||
PacketLossLogger pllog;
|
||||
std::vector<int> sequence({
|
||||
1, 2, 3, 5, 6, 4, 8, 7, 8, 9,
|
||||
12, 13, 14, 15, 16, 17, 18, 19, 20, 10, 21
|
||||
});
|
||||
|
||||
dump(pllog, 0);
|
||||
for(auto val=sequence.begin(); val != sequence.end(); ++val) {
|
||||
pllog.log_packet(*val);
|
||||
dump(pllog, *val);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
21
util.cpp
21
util.cpp
|
@ -33,6 +33,27 @@ format_address(const unsigned char *address)
|
|||
return buf[i];
|
||||
}
|
||||
|
||||
const char*
|
||||
human_readable_unit(size_t value, const char* unit) {
|
||||
static char buf[4][24];
|
||||
static int cur_buf = 0;
|
||||
static const char MULTIPLIERS[] = {' ', 'k', 'M', 'G', 'T'};
|
||||
static const int NB_MULTIPLIERS = 5;
|
||||
|
||||
int multiplier = 0;
|
||||
double div_value = value;
|
||||
|
||||
cur_buf = (cur_buf + 1) % 4;
|
||||
while(div_value >= 1000 && multiplier < NB_MULTIPLIERS) {
|
||||
div_value /= 1000;
|
||||
multiplier++;
|
||||
}
|
||||
snprintf(buf[cur_buf], 24, "%.1lf %c%s",
|
||||
div_value, MULTIPLIERS[multiplier], unit);
|
||||
return buf[cur_buf];
|
||||
}
|
||||
|
||||
|
||||
namespace std {
|
||||
size_t hash<in6_addr>::operator() (const in6_addr& addr) const {
|
||||
size_t out_hash = 0;
|
||||
|
|
3
util.hpp
3
util.hpp
|
@ -47,6 +47,9 @@ void do_debugf(int level, const char *format, ...);
|
|||
/** format_address -- taken from babeld */
|
||||
const char* format_address(const unsigned char* address);
|
||||
|
||||
/** turns a value into a human-readable one, eg. "21.2 kB" */
|
||||
const char* human_readable_unit(size_t value, const char* unit);
|
||||
|
||||
|
||||
/** remove the upper bit from a microsecond timestamp, to conform with the
|
||||
* packet header timestamp format. */
|
||||
|
|
Loading…
Reference in a new issue