packet.py 文件源码

def set_tp_src(self, tp_src):
        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, tp_src)
        elif (self.match.nw_proto == socket.IPPROTO_ICMP):
            self._set_1bytes(self.tcp_header_offset, tp_src)
        self._update_l4_checksum()
        self.match.tp_src = tp_src