github.com/EagleQL/Xray-core@v1.4.3/transport/internet/sockopt_linux.go (about)

     1  package internet
     2  
     3  import (
     4  	"net"
     5  	"syscall"
     6  
     7  	"golang.org/x/sys/unix"
     8  )
     9  
    10  const (
    11  	// For incoming connections.
    12  	TCP_FASTOPEN = 23
    13  	// For out-going connections.
    14  	TCP_FASTOPEN_CONNECT = 30
    15  )
    16  
    17  func bindAddr(fd uintptr, ip []byte, port uint32) error {
    18  	setReuseAddr(fd)
    19  	setReusePort(fd)
    20  
    21  	var sockaddr syscall.Sockaddr
    22  
    23  	switch len(ip) {
    24  	case net.IPv4len:
    25  		a4 := &syscall.SockaddrInet4{
    26  			Port: int(port),
    27  		}
    28  		copy(a4.Addr[:], ip)
    29  		sockaddr = a4
    30  	case net.IPv6len:
    31  		a6 := &syscall.SockaddrInet6{
    32  			Port: int(port),
    33  		}
    34  		copy(a6.Addr[:], ip)
    35  		sockaddr = a6
    36  	default:
    37  		return newError("unexpected length of ip")
    38  	}
    39  
    40  	return syscall.Bind(int(fd), sockaddr)
    41  }
    42  
    43  func applyOutboundSocketOptions(network string, address string, fd uintptr, config *SocketConfig) error {
    44  	if config.Mark != 0 {
    45  		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {
    46  			return newError("failed to set SO_MARK").Base(err)
    47  		}
    48  	}
    49  
    50  	if isTCPSocket(network) {
    51  		tfo := config.ParseTFOValue()
    52  		if tfo > 0 {
    53  			tfo = 1
    54  		}
    55  		if tfo >= 0 {
    56  			if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN_CONNECT, tfo); err != nil {
    57  				return newError("failed to set TCP_FASTOPEN_CONNECT=", tfo).Base(err)
    58  			}
    59  		}
    60  	}
    61  
    62  	if config.Tproxy.IsEnabled() {
    63  		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
    64  			return newError("failed to set IP_TRANSPARENT").Base(err)
    65  		}
    66  	}
    67  
    68  	return nil
    69  }
    70  
    71  func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig) error {
    72  	if config.Mark != 0 {
    73  		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {
    74  			return newError("failed to set SO_MARK").Base(err)
    75  		}
    76  	}
    77  	if isTCPSocket(network) {
    78  		tfo := config.ParseTFOValue()
    79  		if tfo >= 0 {
    80  			if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN, tfo); err != nil {
    81  				return newError("failed to set TCP_FASTOPEN=", tfo).Base(err)
    82  			}
    83  		}
    84  	}
    85  
    86  	if config.Tproxy.IsEnabled() {
    87  		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
    88  			return newError("failed to set IP_TRANSPARENT").Base(err)
    89  		}
    90  	}
    91  
    92  	if config.ReceiveOriginalDestAddress && isUDPSocket(network) {
    93  		err1 := syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, unix.IPV6_RECVORIGDSTADDR, 1)
    94  		err2 := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1)
    95  		if err1 != nil && err2 != nil {
    96  			return err1
    97  		}
    98  	}
    99  
   100  	return nil
   101  }
   102  
   103  func setReuseAddr(fd uintptr) error {
   104  	if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
   105  		return newError("failed to set SO_REUSEADDR").Base(err).AtWarning()
   106  	}
   107  	return nil
   108  }
   109  
   110  func setReusePort(fd uintptr) error {
   111  	if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
   112  		return newError("failed to set SO_REUSEPORT").Base(err).AtWarning()
   113  	}
   114  	return nil
   115  }