github.com/amnezia-vpn/amneziawg-go@v0.2.8/conn/features_linux.go (about)

     1  /* SPDX-License-Identifier: MIT
     2   *
     3   * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
     4   */
     5  
     6  package conn
     7  
     8  import (
     9  	"net"
    10  
    11  	"golang.org/x/sys/unix"
    12  )
    13  
    14  func supportsUDPOffload(conn *net.UDPConn) (txOffload, rxOffload bool) {
    15  	rc, err := conn.SyscallConn()
    16  	if err != nil {
    17  		return
    18  	}
    19  	err = rc.Control(func(fd uintptr) {
    20  		_, errSyscall := unix.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
    21  		txOffload = errSyscall == nil
    22  		// getsockopt(IPPROTO_UDP, UDP_GRO) is not supported in android
    23  		// use setsockopt workaround
    24  		errSyscall = unix.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1)
    25  		rxOffload = errSyscall == nil
    26  	})
    27  	if err != nil {
    28  		return false, false
    29  	}
    30  	return txOffload, rxOffload
    31  }