github.com/noisysockets/noisysockets@v0.21.2-0.20240515114641-7f467e651c90/internal/conn/features_linux.go (about)

     1  // SPDX-License-Identifier: MPL-2.0
     2  /*
     3   * Copyright (C) 2024 The Noisy Sockets Authors.
     4   *
     5   * This Source Code Form is subject to the terms of the Mozilla Public
     6   * License, v. 2.0. If a copy of the MPL was not distributed with this
     7   * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     8   *
     9   * Portions of this file are based on code originally from wireguard-go,
    10   *
    11   * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
    12   *
    13   * Permission is hereby granted, free of charge, to any person obtaining a copy of
    14   * this software and associated documentation files (the "Software"), to deal in
    15   * the Software without restriction, including without limitation the rights to
    16   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
    17   * of the Software, and to permit persons to whom the Software is furnished to do
    18   * so, subject to the following conditions:
    19   *
    20   * The above copyright notice and this permission notice shall be included in all
    21   * copies or substantial portions of the Software.
    22   *
    23   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    24   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    25   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    26   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    27   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    28   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    29   * SOFTWARE.
    30   */
    31  
    32  package conn
    33  
    34  import (
    35  	"net"
    36  
    37  	"golang.org/x/sys/unix"
    38  )
    39  
    40  func supportsUDPOffload(conn *net.UDPConn) (txOffload, rxOffload bool) {
    41  	rc, err := conn.SyscallConn()
    42  	if err != nil {
    43  		return
    44  	}
    45  	err = rc.Control(func(fd uintptr) {
    46  		_, errSyscall := unix.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
    47  		txOffload = errSyscall == nil
    48  		opt, errSyscall := unix.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO)
    49  		rxOffload = errSyscall == nil && opt == 1
    50  	})
    51  	if err != nil {
    52  		return false, false
    53  	}
    54  	return txOffload, rxOffload
    55  }