Port lwip to run tcp/udp service on Linux using raw api, listens on tap device.

Abstract

The code is ported from project lwip. https://github.com/lwip-tcpip/lwip
The main function is the implementation of TCP, UDP, IP, Ethernet protocol.

Files

core/ - The core of the TPC/IP stack; protocol implementations, memory and buffer management, and the low-level raw API.
include/ - lwIP include files.
netif/ - Generic network interface device drivers are kept here.