void IPHeader::setCheckSum()
{
CheckSum sum;
sum(vhl,tos,len,id,flags_offset,ttl,proto.get(),src.get(),dst.get());
check_sum=sum.complete();
}
void ICMPEcho::setCheckSum(PtrLen<const uint8> data)
{
CheckSum sum;
sum(type.get(),code,id,num);
sum.add(data);
check_sum=sum.complete();
}
void UDPHeader::setCheckSum(IPAddress src,IPAddress dst,IPLen len,PtrLen<const uint8> data)
{
CheckSum sum;
uint16 proto=IP_UDP;
sum(src.get(),dst.get(),proto,len,src_port,dst_port,len);
sum.add(data);
check_sum=sum.complete();
}