97 lines
3.5 KiB
Go
97 lines
3.5 KiB
Go
// Copyright 2016 Mikio Hara. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build freebsd netbsd
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package tcpinfo
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import (
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"errors"
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"runtime"
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"time"
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"unsafe"
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"github.com/mikioh/tcpopt"
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)
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var options = [soMax]option{
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soInfo: {ianaProtocolTCP, sysTCP_INFO, parseInfo},
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}
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// Marshal implements the Marshal method of tcpopt.Option interface.
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func (i *Info) Marshal() ([]byte, error) { return (*[sizeofTCPInfo]byte)(unsafe.Pointer(i))[:], nil }
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// A SysInfo represents platform-specific information.
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type SysInfo struct {
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SenderWindowBytes uint `json:"snd_wnd_bytes"` // advertised sender window in bytes [FreeBSD]
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SenderWindowSegs uint `json:"snd_wnd_segs"` // advertised sender window in # of segments [NetBSD]
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NextEgressSeq uint `json:"egress_seq"` // next egress seq. number
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NextIngressSeq uint `json:"ingress_seq"` // next ingress seq. number
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RetransSegs uint `json:"retrans_segs"` // # of retransmit segments sent
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OutOfOrderSegs uint `json:"ooo_segs"` // # of out-of-order segments received
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ZeroWindowUpdates uint `json:"zerownd_updates"` // # of zero-window updates sent
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Offloading bool `json:"offloading"` // TCP offload processing
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}
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var sysStates = [11]State{Closed, Listen, SynSent, SynReceived, Established, CloseWait, FinWait1, Closing, LastAck, FinWait2, TimeWait}
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func parseInfo(b []byte) (tcpopt.Option, error) {
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if len(b) < sizeofTCPInfo {
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return nil, errors.New("short buffer")
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}
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ti := (*tcpInfo)(unsafe.Pointer(&b[0]))
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i := &Info{State: sysStates[ti.State]}
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if ti.Options&sysTCPI_OPT_WSCALE != 0 {
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i.Options = append(i.Options, WindowScale(ti.Pad_cgo_0[0]>>4))
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i.PeerOptions = append(i.PeerOptions, WindowScale(ti.Pad_cgo_0[0]&0x0f))
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}
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if ti.Options&sysTCPI_OPT_SACK != 0 {
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i.Options = append(i.Options, SACKPermitted(true))
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i.PeerOptions = append(i.PeerOptions, SACKPermitted(true))
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}
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if ti.Options&sysTCPI_OPT_TIMESTAMPS != 0 {
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i.Options = append(i.Options, Timestamps(true))
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i.PeerOptions = append(i.PeerOptions, Timestamps(true))
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}
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i.SenderMSS = MaxSegSize(ti.Snd_mss)
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i.ReceiverMSS = MaxSegSize(ti.Rcv_mss)
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i.RTT = time.Duration(ti.Rtt) * time.Microsecond
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i.RTTVar = time.Duration(ti.Rttvar) * time.Microsecond
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i.RTO = time.Duration(ti.Rto) * time.Microsecond
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i.ATO = time.Duration(ti.X__tcpi_ato) * time.Microsecond
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i.LastDataSent = time.Duration(ti.X__tcpi_last_data_sent) * time.Microsecond
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i.LastDataReceived = time.Duration(ti.Last_data_recv) * time.Microsecond
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i.LastAckReceived = time.Duration(ti.X__tcpi_last_ack_recv) * time.Microsecond
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i.FlowControl = &FlowControl{
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ReceiverWindow: uint(ti.Rcv_space),
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}
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i.CongestionControl = &CongestionControl{
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SenderSSThreshold: uint(ti.Snd_ssthresh),
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ReceiverSSThreshold: uint(ti.X__tcpi_rcv_ssthresh),
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}
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i.Sys = &SysInfo{
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NextEgressSeq: uint(ti.Snd_nxt),
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NextIngressSeq: uint(ti.Rcv_nxt),
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RetransSegs: uint(ti.Snd_rexmitpack),
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OutOfOrderSegs: uint(ti.Rcv_ooopack),
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ZeroWindowUpdates: uint(ti.Snd_zerowin),
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}
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if ti.Options&sysTCPI_OPT_TOE != 0 {
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i.Sys.Offloading = true
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}
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switch runtime.GOOS {
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case "freebsd":
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i.CongestionControl.SenderWindowBytes = uint(ti.Snd_cwnd)
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i.Sys.SenderWindowBytes = uint(ti.Snd_wnd)
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case "netbsd":
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i.CongestionControl.SenderWindowSegs = uint(ti.Snd_cwnd)
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i.Sys.SenderWindowSegs = uint(ti.Snd_wnd)
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}
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return i, nil
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}
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func parseCCAlgorithmInfo(name string, b []byte) (CCAlgorithmInfo, error) {
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return nil, errors.New("operation not supported")
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}
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