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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build go1.21
package quic
import (
"net/netip"
"sync"
)
type datagram struct {
b []byte
localAddr netip.AddrPort
peerAddr netip.AddrPort
ecn ecnBits
}
// Explicit Congestion Notification bits.
//
// https://www.rfc-editor.org/rfc/rfc3168.html#section-5
type ecnBits byte
const (
ecnMask = 0b000000_11
ecnNotECT = 0b000000_00
ecnECT1 = 0b000000_01
ecnECT0 = 0b000000_10
ecnCE = 0b000000_11
)
var datagramPool = sync.Pool{
New: func() any {
return &datagram{
b: make([]byte, maxUDPPayloadSize),
}
},
}
func newDatagram() *datagram {
m := datagramPool.Get().(*datagram)
*m = datagram{
b: m.b[:cap(m.b)],
}
return m
}
func (m *datagram) recycle() {
if cap(m.b) != maxUDPPayloadSize {
return
}
datagramPool.Put(m)
}
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