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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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5
internal/gtcpip/header/udp.go
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@ -114,8 +114,9 @@ func (b UDP) SetLength(length uint16) {
// checksum of the network-layer pseudo-header and the checksum of the payload.
func (b UDP) CalculateChecksum(partialChecksum uint16) uint16 {
// Calculate the rest of the checksum.\
// return checksum.Checksum(b[:UDPMinimumSize], partialChecksum)
xsum := checksum.Checksum(b[:udpChecksum], partialChecksum)
xsum = checksum.Checksum(b[udpChecksum+2:], xsum)
xsum = checksum.Checksum(b[udpChecksum+2:UDPMinimumSize], xsum)
return xsum
}
@ -123,7 +124,7 @@ func (b UDP) CalculateChecksum(partialChecksum uint16) uint16 {
func (b UDP) IsChecksumValid(src, dst tcpip.Address, payloadChecksum uint16) bool {
xsum := PseudoHeaderChecksum(UDPProtocolNumber, dst.AsSlice(), src.AsSlice(), b.Length())
xsum = checksum.Combine(xsum, payloadChecksum)
return b.CalculateChecksum(xsum) == 0xffff
return checksum.Checksum(b[:UDPMinimumSize], xsum) == 0xffff
}
// Encode encodes all the fields of the UDP header.