packet.py 文件源码

def set_tp_dst(self, tp_dst):
        if self.tcp_header_offset is None:
            return
        if (self.match.nw_proto == socket.IPPROTO_TCP or
            self.match.nw_proto == socket.IPPROTO_UDP): 
            self._set_2bytes(self.tcp_header_offset +2, tp_dst)
        elif (self.match.nw_proto == socket.IPPROTO_ICMP):
            self._set_1bytes(self.tcp_header_offset + 1, tp_dst)
        self._update_l4_checksum()
        self.match.tp_dst = tp_dst