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net/packet: documentation cleanups.

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Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2020-11-10 21:12:46 -08:00
parent 9ef39af2f2
commit d7ee3096dd
2 changed files with 21 additions and 15 deletions
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11
net/packet/udp4.go
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@@ -14,17 +14,17 @@ type UDP4Header struct {
}
const (
// udpHeaderLength is the size of the UDP packet header, not
// including the outer IP header.
udpHeaderLength = 8
// udpTotalHeaderLength is the length of all headers in a UDP packet.
udpTotalHeaderLength = ip4HeaderLength + udpHeaderLength
)
func (UDP4Header) Len() int {
return udpTotalHeaderLength
return ip4HeaderLength + udpHeaderLength
}
func (h UDP4Header) Marshal(buf []byte) error {
if len(buf) < udpTotalHeaderLength {
if len(buf) < h.Len() {
return errSmallBuffer
}
if len(buf) > maxPacketLength {
@@ -39,9 +39,8 @@ func (h UDP4Header) Marshal(buf []byte) error {
binary.BigEndian.PutUint16(buf[24:26], uint16(length))
binary.BigEndian.PutUint16(buf[26:28], 0) // blank checksum
h.IP4Header.MarshalPseudo(buf)
// UDP checksum with IP pseudo header.
h.IP4Header.MarshalPseudo(buf)
binary.BigEndian.PutUint16(buf[26:28], ipChecksum(buf[8:]))
h.IP4Header.Marshal(buf)