The invention provides a chip from the perspective of a UDF application, which comprises an interface information module, a virtual local area network module, a three-layer variable header module, a multi-protocol label module and a four-layer header module, wherein the interface information module, the virtual local area network module, the three-layer variable header module, the multi-protocol label module and the four-layer header module serve as key information for matching, several groups of offset positions and an initial byte number of each offset point are compiled, data defined by a user are taken out based on the configuration, a control list is accessed finally for matching. Network protocol message demands changing continuously on the current protocol surface can be flexibly supported, and the service life of the chip is longer.