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//go:build dragonfly || freebsd || linux || netbsd || openbsd
// +build dragonfly freebsd linux netbsd openbsd
package extendedstats
import (
"crypto/tls"
"fmt"
"net"
"github.com/network-quality/goresponsiveness/utilities"
"golang.org/x/sys/unix"
)
type AggregateExtendedStats struct {
MaxPathMtu uint64
MaxSendMss uint64
MaxRecvMss uint64
TotalRetransmissions uint64
TotalReorderings uint64
AverageRtt float64
rtt_measurements uint64
total_rtt float64
}
func ExtendedStatsAvailable() bool {
return true
}
func (es *AggregateExtendedStats) IncorporateConnectionStats(basicConn net.Conn) error {
if info, err := GetTCPInfo(basicConn); err != nil {
return fmt.Errorf("OOPS: Could not get the TCP info for the connection: %v", err)
} else {
es.MaxPathMtu = utilities.Max(es.MaxPathMtu, uint64(info.Pmtu))
es.MaxRecvMss = utilities.Max(es.MaxRecvMss, uint64(info.Rcv_mss))
es.MaxSendMss = utilities.Max(es.MaxSendMss, uint64(info.Snd_mss))
// https://lkml.iu.edu/hypermail/linux/kernel/1705.0/01790.html
es.TotalRetransmissions += uint64(info.Total_retrans)
es.TotalReorderings += uint64(info.Reordering)
es.total_rtt += float64(info.Rtt)
es.rtt_measurements += 1
es.AverageRtt = es.total_rtt / float64(es.rtt_measurements)
}
return nil
}
func (es *AggregateExtendedStats) Repr() string {
return fmt.Sprintf(`Extended Statistics:
Maximum Path MTU: %v
Maximum Send MSS: %v
Maximum Recv MSS: %v
Total Retransmissions: %v
Total Reorderings: %v
Average RTT: %v
`, es.MaxPathMtu, es.MaxSendMss, es.MaxRecvMss, es.TotalRetransmissions, es.TotalReorderings, es.AverageRtt)
}
func GetTCPInfo(basicConn net.Conn) (*unix.TCPInfo, error) {
tlsConn, ok := basicConn.(*tls.Conn)
if !ok {
return nil, fmt.Errorf("OOPS: Outermost connection is not a TLS connection")
}
tcpConn, ok := tlsConn.NetConn().(*net.TCPConn)
if !ok {
return nil, fmt.Errorf(
"OOPS: Could not get the TCP info for the connection (not a TCP connection)",
)
}
rawConn, err := tcpConn.SyscallConn()
if err != nil {
return nil, err
}
var info *unix.TCPInfo = nil
rawConn.Control(func(fd uintptr) {
info, err = unix.GetsockoptTCPInfo(int(fd), unix.SOL_TCP, unix.TCP_INFO)
})
return info, err
}
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