1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
//go:build darwin
// +build darwin
package extendedstats
import (
"crypto/tls"
"fmt"
"net"
"github.com/network-quality/goresponsiveness/utilities"
"golang.org/x/sys/unix"
)
type AggregateExtendedStats struct {
Maxseg uint64
MaxSendMss uint64
MaxRecvMss uint64
TotalRetransmissions uint64
totalSent uint64
TotalReorderings uint64
AverageRtt float64
rtt_measurements uint64
total_rtt float64
RetransmitRatio float64
}
func ExtendedStatsAvailable() bool {
return true
}
type TCPInfo struct {
Rxoutoforderbytes uint64
Txretransmitbytes uint64
Txbytes uint64
Rtt uint32
Maxseg uint32
Snd_cwnd uint32
}
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.Maxseg = utilities.Max(es.Maxseg, uint64(info.Maxseg))
es.TotalReorderings += info.Rxoutoforderbytes
es.TotalRetransmissions += info.Txretransmitbytes
es.totalSent += info.Txbytes
es.total_rtt += float64(info.Rtt)
es.rtt_measurements += 1
es.AverageRtt = es.total_rtt / float64(es.rtt_measurements)
es.RetransmitRatio = (float64(es.TotalRetransmissions) / float64(es.totalSent)) * 100.0
}
return nil
}
func (es *AggregateExtendedStats) Repr() string {
return fmt.Sprintf(`Extended Statistics:
Maximum Segment Size: %v
Total Bytes Retransmitted: %v
Retransmission Ratio: %.2f%%
Total Bytes Reordered: %v
Average RTT: %v
`, es.Maxseg, es.TotalRetransmissions, es.RetransmitRatio, es.TotalReorderings, es.AverageRtt)
}
func GetTCPInfo(basicConn net.Conn) (*TCPInfo, error) {
tlsConn, ok := basicConn.(*tls.Conn)
if !ok {
return nil, fmt.Errorf(
"OOPS: Could not get the TCP info for the connection (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 rawInfo *unix.TCPConnectionInfo = nil
var tcpInfo *TCPInfo = nil
rawConn.Control(func(fd uintptr) {
rawInfo, err = unix.GetsockoptTCPConnectionInfo(
int(fd),
unix.IPPROTO_TCP,
unix.TCP_CONNECTION_INFO,
)
})
if rawInfo != nil && err == nil {
tcpInfo = &TCPInfo{}
tcpInfo.Rxoutoforderbytes = rawInfo.Rxoutoforderbytes
tcpInfo.Txretransmitbytes = rawInfo.Txretransmitbytes
tcpInfo.Rtt = rawInfo.Srtt
tcpInfo.Snd_cwnd = rawInfo.Snd_cwnd
tcpInfo.Maxseg = rawInfo.Maxseg
}
return tcpInfo, err
}
|
