diff options
Diffstat (limited to 'pkg/tcpip/header/tcp.go')
| -rw-r--r-- | pkg/tcpip/header/tcp.go | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/pkg/tcpip/header/tcp.go b/pkg/tcpip/header/tcp.go index 207046b36..d37d624fe 100644 --- a/pkg/tcpip/header/tcp.go +++ b/pkg/tcpip/header/tcp.go @@ -231,19 +231,12 @@ func (b TCP) SetChecksum(checksum uint16) { binary.BigEndian.PutUint16(b[tcpChecksum:], checksum) } -// CalculateChecksum calculates the checksum of the tcp segment given -// the totalLen and partialChecksum(descriptions below) -// totalLen is the total length of the segment +// CalculateChecksum calculates the checksum of the tcp segment. // partialChecksum is the checksum of the network-layer pseudo-header -// (excluding the total length) and the checksum of the segment data. -func (b TCP) CalculateChecksum(partialChecksum uint16, totalLen uint16) uint16 { - // Add the length portion of the checksum to the pseudo-checksum. - tmp := make([]byte, 2) - binary.BigEndian.PutUint16(tmp, totalLen) - checksum := Checksum(tmp, partialChecksum) - +// and the checksum of the segment data. +func (b TCP) CalculateChecksum(partialChecksum uint16) uint16 { // Calculate the rest of the checksum. - return Checksum(b[:b.DataOffset()], checksum) + return Checksum(b[:b.DataOffset()], partialChecksum) } // Options returns a slice that holds the unparsed TCP options in the segment. |