errors_linux.go raw

   1  /* SPDX-License-Identifier: MIT
   2   *
   3   * Copyright (C) 2017-2025 WireGuard LLC. All Rights Reserved.
   4   */
   5  
   6  package conn
   7  
   8  import (
   9  	"errors"
  10  	"os"
  11  
  12  	"golang.org/x/sys/unix"
  13  )
  14  
  15  func errShouldDisableUDPGSO(err error) bool {
  16  	var serr *os.SyscallError
  17  	if errors.As(err, &serr) {
  18  		// EIO is returned by udp_send_skb() if the device driver does not have
  19  		// tx checksumming enabled, which is a hard requirement of UDP_SEGMENT.
  20  		// See:
  21  		// https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/man7/udp.7?id=806eabd74910447f21005160e90957bde4db0183#n228
  22  		// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/ipv4/udp.c?h=v6.2&id=c9c3395d5e3dcc6daee66c6908354d47bf98cb0c#n942
  23  		return serr.Err == unix.EIO
  24  	}
  25  	return false
  26  }
  27