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121 lines
3.3 KiB
121 lines
3.3 KiB
package internet
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import (
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"net"
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"syscall"
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"golang.org/x/sys/unix"
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)
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const (
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// For incoming connections.
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TCP_FASTOPEN = 23
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// For out-going connections.
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TCP_FASTOPEN_CONNECT = 30
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)
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func bindAddr(fd uintptr, ip []byte, port uint32) error {
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setReuseAddr(fd)
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setReusePort(fd)
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var sockaddr syscall.Sockaddr
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switch len(ip) {
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case net.IPv4len:
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a4 := &syscall.SockaddrInet4{
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Port: int(port),
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}
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copy(a4.Addr[:], ip)
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sockaddr = a4
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case net.IPv6len:
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a6 := &syscall.SockaddrInet6{
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Port: int(port),
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}
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copy(a6.Addr[:], ip)
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sockaddr = a6
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default:
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return newError("unexpected length of ip")
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}
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return syscall.Bind(int(fd), sockaddr)
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}
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func applyOutboundSocketOptions(network string, address string, fd uintptr, config *SocketConfig) error {
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if config.Mark != 0 {
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {
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return newError("failed to set SO_MARK").Base(err)
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}
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}
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if isTCPSocket(network) {
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switch config.Tfo {
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case SocketConfig_Enable:
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN_CONNECT, 1); err != nil {
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return newError("failed to set TCP_FASTOPEN_CONNECT=1").Base(err)
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}
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case SocketConfig_Disable:
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN_CONNECT, 0); err != nil {
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return newError("failed to set TCP_FASTOPEN_CONNECT=0").Base(err)
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}
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}
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}
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if config.Tproxy.IsEnabled() {
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
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return newError("failed to set IP_TRANSPARENT").Base(err)
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}
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}
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return nil
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}
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func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig) error {
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if config.Mark != 0 {
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {
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return newError("failed to set SO_MARK").Base(err)
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}
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}
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if isTCPSocket(network) {
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switch config.Tfo {
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case SocketConfig_Enable:
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN, 1); err != nil {
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return newError("failed to set TCP_FASTOPEN=1").Base(err)
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}
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case SocketConfig_Disable:
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_TCP, TCP_FASTOPEN, 0); err != nil {
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return newError("failed to set TCP_FASTOPEN=0").Base(err)
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}
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}
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}
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if config.Tproxy.IsEnabled() {
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
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return newError("failed to set IP_TRANSPARENT").Base(err)
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}
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}
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if config.ReceiveOriginalDestAddress && isUDPSocket(network) {
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err1 := syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, unix.IPV6_RECVORIGDSTADDR, 1)
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err2 := syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1)
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if err1 != nil && err2 != nil {
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return err1
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}
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}
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return nil
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}
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func setReuseAddr(fd uintptr) error {
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
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return newError("failed to set SO_REUSEADDR").Base(err).AtWarning()
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}
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return nil
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}
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func setReusePort(fd uintptr) error {
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if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
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return newError("failed to set SO_REUSEPORT").Base(err).AtWarning()
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}
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return nil
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}
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