142 lines
4.5 KiB
C++
142 lines
4.5 KiB
C++
#pragma once
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/** A peer of a bound (server) instance of UdpVpn */
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#include <netinet/in.h>
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#include <time.h>
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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_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)(_win_start_losses - _last_window_losses)
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/ (double)PACKET_LOSS_WINDOW;
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}
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uint8_t get_received_ahead() const {
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return _received_ahead;
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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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/// 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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uint8_t _received_ahead; // Warning: must have >= bits than PACKET_LOSS_AFTER
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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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class RTTLogger {
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public:
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RTTLogger();
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uint32_t avg_rtt() const { return _avg_rtt; }
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uint32_t cur_rtt() const { return _cur_rtt; }
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struct timespec get_last_update() const {
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return _last_update;
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}
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/** Checks whether an update is due.
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* If soon is true, divides the inter-update delay by 2.
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*/
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bool update_due(bool soon=false) const;
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void log(const VpnTlvRTTA& rtt_answer);
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private:
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uint32_t _avg_rtt, _cur_rtt;
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static const double EXP_AVG_FACTOR;
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unsigned int _update_delay; // in ms
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static const unsigned int BASE_UPDATE_DELAY; // in ms
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struct timespec _last_update;
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};
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class VpnPeer {
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public:
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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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~VpnPeer();
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const sockaddr_in6& get_ext_addr() const { return _ext_addr; }
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const in6_addr& get_int_addr() const { return _int_addr; }
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void set_int_addr(const in6_addr& int_addr);
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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 tick(); ///< periodic actions, triggered every UdpVpn tick
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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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uint32_t peek_next_seqno() const { return _next_send_seqno; }
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uint32_t next_seqno() { return _next_send_seqno++; }
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uint64_t get_tot_bytes_sent() const { return _tot_bytes_sent; }
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double get_outbound_byte_rate() const { return _outbound_byte_rate; }
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void got_inbound_packet(const VpnPacket& packet);
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/* === Control protocol === */
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/// Send a control packet if there is data to be sent
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bool send_control_packet();
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/// Append a RTTA for the given RTTQ to the next control packet
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void make_rtta_for(const VpnTlvRTTQ& rttq);
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private: // meth
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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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sockaddr_in6 _ext_addr;
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in6_addr _int_addr;
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uint32_t _next_send_seqno;
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uint64_t _tot_bytes_sent, _prev_tot_bytes_sent;
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double _outbound_byte_rate;
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struct timespec _prev_tick_time;
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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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VpnControlPacket* _next_control_packet;
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};
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