tailscale/net/packet/udp6.go

55 lines
1.2 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package packet
import (
"encoding/binary"
"tailscale.com/types/ipproto"
)
// UDP6Header is an IPv6+UDP header.
type UDP6Header struct {
IP6Header
SrcPort uint16
DstPort uint16
}
// Len implements Header.
func (h UDP6Header) Len() int {
return h.IP6Header.Len() + udpHeaderLength
}
// Marshal implements Header.
func (h UDP6Header) Marshal(buf []byte) error {
if len(buf) < h.Len() {
return errSmallBuffer
}
if len(buf) > maxPacketLength {
return errLargePacket
}
// The caller does not need to set this.
h.IPProto = ipproto.UDP
length := len(buf) - h.IP6Header.Len()
binary.BigEndian.PutUint16(buf[40:42], h.SrcPort)
binary.BigEndian.PutUint16(buf[42:44], h.DstPort)
binary.BigEndian.PutUint16(buf[44:46], uint16(length))
binary.BigEndian.PutUint16(buf[46:48], 0) // blank checksum
// UDP checksum with IP pseudo header.
h.IP6Header.marshalPseudo(buf, ipproto.UDP)
binary.BigEndian.PutUint16(buf[46:48], ip4Checksum(buf[:]))
h.IP6Header.Marshal(buf)
return nil
}
// ToResponse implements Header.
func (h *UDP6Header) ToResponse() {
h.SrcPort, h.DstPort = h.DstPort, h.SrcPort
h.IP6Header.ToResponse()
}