My Linux network programming small white one, you do is issue on network layer routing algorithm, preliminary already get the algorithm or something out, now set out to write code in c, met a bottleneck, due to limited information on the Internet, ask you a great god, and how to customize the network layer data packets, when code implementation, what is the general implementation steps? What is this information can be for reference? Best is related to the custom of network layer protocol code, the younger brother in this thank humbly!