A utilize that use kernel tcpip stack to forward packet from tun device. 

Tun2Socket

A utilize that use kernel tcpip stack to forward packet from tun device.

Feature

• IPv4
• TCP/UDP
• Ping Echo

from https://github.com/Kr328/tun2socket

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Package socket provides a low-level network connection type which integrates with Go's runtime network poller to provide asynchronous I/O and deadline support.

socket

Package socket provides a low-level network connection type which integrates with Go's runtime network poller to provide asynchronous I/O and deadline support. MIT Licensed.

This package focuses on UNIX-like operating systems which make use of BSD sockets system call APIs. It is meant to be used as a foundation for the creation of operating system-specific socket packages, for socket families such as Linux's AF_NETLINK, AF_PACKET, or AF_VSOCK. This package should not be used directly in end user applications.

Any use of package socket should be guarded by build tags, as one would also use when importing the syscall or golang.org/x/sys packages.

Stability

See the CHANGELOG file for a description of changes between releases.

This package only supports the two most recent major versions of Go, mirroring Go's own release policy. Older versions of Go may lack critical features and bug fixes which are necessary for this package to function correctly.

from https://github.com/mdlayher/socket