feat: Waku v2 bridge

Issue #12610

vendor/github.com/mikioh/tcpinfo/tcp.go

@@ -0,0 +1,101 @@
+// Copyright 2016 Mikio Hara. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tcpinfo
+
+// A State represents a state of connection.
+type State int
+
+const (
+	Unknown State = iota
+	Closed
+	Listen
+	SynSent
+	SynReceived
+	Established
+	FinWait1
+	FinWait2
+	CloseWait
+	LastAck
+	Closing
+	TimeWait
+)
+
+var states = map[State]string{
+	Unknown:     "unknown",
+	Closed:      "closed",
+	Listen:      "listen",
+	SynSent:     "syn-sent",
+	SynReceived: "syn-received",
+	Established: "established",
+	FinWait1:    "fin-wait-1",
+	FinWait2:    "fin-wait-2",
+	CloseWait:   "close-wait",
+	LastAck:     "last-ack",
+	Closing:     "closing",
+	TimeWait:    "time-wait",
+}
+
+func (st State) String() string {
+	s, ok := states[st]
+	if !ok {
+		return "<nil>"
+	}
+	return s
+}
+
+// An OptionKind represents an option kind.
+type OptionKind int
+
+const (
+	KindMaxSegSize    OptionKind = 2
+	KindWindowScale   OptionKind = 3
+	KindSACKPermitted OptionKind = 4
+	KindTimestamps    OptionKind = 8
+)
+
+var optionKinds = map[OptionKind]string{
+	KindMaxSegSize:    "mss",
+	KindWindowScale:   "wscale",
+	KindSACKPermitted: "sack",
+	KindTimestamps:    "tmstamps",
+}
+
+func (k OptionKind) String() string {
+	s, ok := optionKinds[k]
+	if !ok {
+		return "<nil>"
+	}
+	return s
+}
+
+// An Option represents an option.
+type Option interface {
+	Kind() OptionKind
+}
+
+// A MaxSegSize represents a maxiumum segment size option.
+type MaxSegSize uint
+
+// Kind returns an option kind field.
+func (mss MaxSegSize) Kind() OptionKind { return KindMaxSegSize }
+
+// A WindowScale represents a windows scale option.
+type WindowScale int
+
+// Kind returns an option kind field.
+func (ws WindowScale) Kind() OptionKind { return KindWindowScale }
+
+// A SACKPermitted reports whether a selective acknowledgment
+// permitted option is enabled.
+type SACKPermitted bool
+
+// Kind returns an option kind field.
+func (sp SACKPermitted) Kind() OptionKind { return KindSACKPermitted }
+
+// A Timestamps reports whether a timestamps option is enabled.
+type Timestamps bool
+
+// Kind returns an option kind field.
+func (ts Timestamps) Kind() OptionKind { return KindTimestamps }