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Fix checksum changes

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This commit is contained in:
世界 2025-08-27 15:45:18 +08:00
parent adc106bcf6
commit ff49ece55d
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GPG key ID: CD109927C34A63C4
4 changed files with 11 additions and 4 deletions
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4
internal/gtcpip/header/tcp.go
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@ -351,6 +351,7 @@ func (b TCP) SetUrgentPointer(urgentPointer uint16) {
// and the checksum of the segment data.
func (b TCP) CalculateChecksum(partialChecksum uint16) uint16 {
// Calculate the rest of the checksum.
// return checksum.Checksum(b[:b.DataOffset()], partialChecksum)
xsum := checksum.Checksum(b[:TCPChecksumOffset], partialChecksum)
xsum = checksum.Checksum(b[TCPChecksumOffset+2:b.DataOffset()], xsum)
return xsum
@ -360,7 +361,8 @@ func (b TCP) CalculateChecksum(partialChecksum uint16) uint16 {
func (b TCP) IsChecksumValid(src, dst tcpip.Address, payloadChecksum, payloadLength uint16) bool {
xsum := PseudoHeaderChecksum(TCPProtocolNumber, src.AsSlice(), dst.AsSlice(), uint16(b.DataOffset())+payloadLength)
xsum = checksum.Combine(xsum, payloadChecksum)
return b.CalculateChecksum(xsum) == 0xffff
// return b.CalculateChecksum(xsum) == 0xffff
return checksum.Checksum(b[:b.DataOffset()], xsum) == 0xffff
}
// Options returns a slice that holds the unparsed TCP options in the segment.