Linux环境下自己构建包packet，包括MAC头部，UDP、TCP头部，以及数据及校验和计算，构建完包之后用原始套接字来进行发送-After the Linux environment to build their own package packet, including the MAC header, UDP, TCP header, and data and checksum calculation, build complete package with a raw socket t

这是关于原始套接字包过滤防火墙的源代码，希望大家可以下载学习指教-This is about raw socket packet filtering firewall source code, hope that we can download to learn Zhijiao