Function checksumValid

polyamide/tun/offload_linux.go:388–398

(pkt []byte, iphLen, proto uint8, isV6 bool)

}

func checksumValid(pkt []byte, iphLen, proto uint8, isV6 bool) bool {
	srcAddrAt := ipv4SrcAddrOffset
	addrSize := 4
	if isV6 {
		srcAddrAt = ipv6SrcAddrOffset
		addrSize = 16
	}
	lenForPseudo := uint16(len(pkt) - int(iphLen))
	cSum := pseudoHeaderChecksumNoFold(proto, pkt[srcAddrAt:srcAddrAt+addrSize], pkt[srcAddrAt+addrSize:srcAddrAt+addrSize*2], lenForPseudo)
	return ^checksum(pkt[iphLen:], cSum) == 0
}

// coalesceResult represents the result of attempting to coalesce two TCP
// packets.