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@ -9,10 +9,9 @@ import (
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"net"
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"os"
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"os/exec"
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"syscall"
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"unsafe"
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"github.com/insomniacslk/dhcp/dhcpv4"
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"golang.org/x/sys/unix"
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"golang.zx2c4.com/wireguard/tun"
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"inet.af/netaddr"
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"inet.af/netstack/tcpip"
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@ -32,25 +31,30 @@ var ourMAC = net.HardwareAddr{0x30, 0x2D, 0x66, 0xEC, 0x7A, 0x93}
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func init() { createTAP = createTAPLinux }
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func createTAPLinux(tapName, bridgeName string) (dev tun.Device, err error) {
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fd, err := syscall.Open("/dev/net/tun", syscall.O_RDWR, 0)
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func createTAPLinux(tapName, bridgeName string) (tun.Device, error) {
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fd, err := unix.Open("/dev/net/tun", unix.O_RDWR, 0)
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if err != nil {
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return nil, err
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}
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var ifr struct {
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name [16]byte
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flags uint16
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_ [22]byte
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dev, err := openDevice(fd, tapName, bridgeName)
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if err != nil {
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unix.Close(fd)
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return nil, err
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}
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return dev, nil
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}
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copy(ifr.name[:], tapName)
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ifr.flags = syscall.IFF_TAP | syscall.IFF_NO_PI
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_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.TUNSETIFF, uintptr(unsafe.Pointer(&ifr)))
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if errno != 0 {
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syscall.Close(fd)
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return nil, errno
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func openDevice(fd int, tapName, bridgeName string) (tun.Device, error) {
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ifr, err := unix.NewIfreq(tapName)
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if err != nil {
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return nil, err
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}
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if err = syscall.SetNonblock(fd, true); err != nil {
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syscall.Close(fd)
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// Flags are stored as a uint16 in the ifreq union.
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ifr.SetUint16(unix.IFF_TAP | unix.IFF_NO_PI)
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if err := unix.IoctlIfreq(fd, unix.TUNSETIFF, ifr); err != nil {
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return nil, err
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}
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@ -62,11 +66,13 @@ func createTAPLinux(tapName, bridgeName string) (dev tun.Device, err error) {
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return nil, err
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}
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}
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dev, _, err = tun.CreateUnmonitoredTUNFromFD(fd) // TODO: MTU
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// Also sets non-blocking I/O on fd when creating tun.Device.
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dev, _, err := tun.CreateUnmonitoredTUNFromFD(fd) // TODO: MTU
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if err != nil {
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syscall.Close(fd)
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return nil, err
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}
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return dev, nil
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}
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Matt Layher
3 years ago
committed by