tcp

package

v0.0.0-...-968416b Latest Latest Go to latest Published: Jun 8, 2022 License: Apache-2.0 Imports: 21 Imported by: 0

Details

Valid go.mod file

The Go module system was introduced in Go 1.11 and is the official dependency management solution for Go.
Redistributable license

Redistributable licenses place minimal restrictions on how software can be used, modified, and redistributed.
Tagged version

Modules with tagged versions give importers more predictable builds.
Stable version

When a project reaches major version v1 it is considered stable.
Learn more about best practices

View Source

const (
	ProtocolName   = "tcp"
	ProtocolNumber = header.TCPProtocolNumber

	DefaultBufferSize = 1 << 20 // 1MB 接收或发送缓存的默认值

)

View Source

const (
	InitialCwnd = 10 // 初始拥塞窗口大小

)

View Source

const (
	MaxSACKBlocks = 6 // 接收端存储的最大SACK块数。
)

View Source

var (
	// SynRcvdCountThreshold 在TCP使用 SYN cookies接受连接之前，允许的最大的处于 SYN-RCVD 状态的数量
	SynRcvdCountThreshold uint64 = 1000
)

func FindWndScale(wnd seqnum.Size) int

FindWndScale 对于给定的最大窗口大小，确定窗口扩展因子因为窗口的大小不能超过序列号范围的一半，即窗口最大2^30, so (2^16)*(2^maxWnsScale) < 2^30, get maxWnsScale = 14

func TrimSACKBlockList(sack *SACKInfo, rcvNxt seqnum.Value)

TrimSACKBlockList tcp的可靠性：通过删除/修改 start为 <rcvNxt 的任何块来更新sack块列表。

func UpdateSACKBlocks(sack *SACKInfo, segStart seqnum.Value, segEnd seqnum.Value, rcvNxt seqnum.Value)

UpdateSACKBlocks tcp的可靠性：更新SACK块列表以包含 segStart-segEnd 指定的段，只有没有被消费掉的seg才会被用来更新sack。如果该段恰好是无序传递，那么sack.blocks中的第一个块总是包括由 segStart-segEnd 标识的段。

type AvailableCongestionControlOption string // 返回支持的拥塞控制算法

type CongestionControlOption string // 设置当前的拥塞控制算法

type ReceiveBufferSizeOption struct {
	Min     int
	Default int
	Max     int
}

type SACKEnabled bool // 开启SACK功能

type SACKInfo struct {
	Blocks    [MaxSACKBlocks]header.SACKBlock
	NumBlocks int // 有效blocks的数量
}

SACKInfo 持有给定端点的TCP SACK信息

type SendBufferSizeOption struct {
	Min     int
	Default int
	Max     int
}