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This is one rough version of lwip support, and it does not support ipv6. lwIP does not support sctp raw socket, so it only can support the feature of udp socket. The macro of ip header and udp header are added for the different naming between linux-based platform and lwip, but I noticed the similar data structure are also added for windows-based platform. Not sure which way is more suitable, so I added the macro first. thanks.
#580