github.com/Uhtred009/v2ray-core-1@v4.31.2+incompatible/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 switch config.Tfo { 52 case SocketConfig_Enable: 53 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN_CONNECT, 1); err != nil { 54 return newError("failed to set TCP_FASTOPEN_CONNECT=1").Base(err) 55 } 56 case SocketConfig_Disable: 57 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN_CONNECT, 0); err != nil { 58 return newError("failed to set TCP_FASTOPEN_CONNECT=0").Base(err) 59 } 60 } 61 } 62 63 if config.Tproxy.IsEnabled() { 64 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil { 65 return newError("failed to set IP_TRANSPARENT").Base(err) 66 } 67 } 68 69 return nil 70 } 71 72 func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig) error { 73 if config.Mark != 0 { 74 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil { 75 return newError("failed to set SO_MARK").Base(err) 76 } 77 } 78 if isTCPSocket(network) { 79 switch config.Tfo { 80 case SocketConfig_Enable: 81 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN, 1); err != nil { 82 return newError("failed to set TCP_FASTOPEN=1").Base(err) 83 } 84 case SocketConfig_Disable: 85 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN, 0); err != nil { 86 return newError("failed to set TCP_FASTOPEN=0").Base(err) 87 } 88 } 89 } 90 91 if config.Tproxy.IsEnabled() { 92 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil { 93 return newError("failed to set IP_TRANSPARENT").Base(err) 94 } 95 } 96 97 if config.ReceiveOriginalDestAddress && isUDPSocket(network) { 98 err1 := syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, unix.IPV6_RECVORIGDSTADDR, 1) 99 err2 := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1) 100 if err1 != nil && err2 != nil { 101 return err1 102 } 103 } 104 105 return nil 106 } 107 108 func setReuseAddr(fd uintptr) error { 109 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil { 110 return newError("failed to set SO_REUSEADDR").Base(err).AtWarning() 111 } 112 return nil 113 } 114 115 func setReusePort(fd uintptr) error { 116 if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil { 117 return newError("failed to set SO_REUSEPORT").Base(err).AtWarning() 118 } 119 return nil 120 }