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世界 2022-07-11 17:15:22 +08:00
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113
tun_linux.go Normal file
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package tun
import (
"net"
"net/netip"
"github.com/vishvananda/netlink"
"gvisor.dev/gvisor/pkg/tcpip/link/tun"
)
func Open(name string) (uintptr, error) {
tunFd, err := tun.Open(name)
if err != nil {
return 0, err
}
return uintptr(tunFd), nil
}
func Configure(name string, inet4Address netip.Prefix, inet6Address netip.Prefix, mtu uint32, autoRoute bool) error {
tunLink, err := netlink.LinkByName(name)
if err != nil {
return err
}
if inet4Address.IsValid() {
addr4, _ := netlink.ParseAddr(inet4Address.String())
err = netlink.AddrAdd(tunLink, addr4)
if err != nil {
return err
}
}
if inet6Address.IsValid() {
addr6, _ := netlink.ParseAddr(inet6Address.String())
err = netlink.AddrAdd(tunLink, addr6)
if err != nil {
return err
}
}
err = netlink.LinkSetMTU(tunLink, int(mtu))
if err != nil {
return err
}
err = netlink.LinkSetUp(tunLink)
if err != nil {
return err
}
if autoRoute {
if inet4Address.IsValid() {
err = netlink.RouteAdd(&netlink.Route{
Dst: &net.IPNet{
IP: net.IPv4zero,
Mask: net.CIDRMask(0, 32),
},
LinkIndex: tunLink.Attrs().Index,
})
if err != nil {
return err
}
}
if inet6Address.IsValid() {
err = netlink.RouteAdd(&netlink.Route{
Dst: &net.IPNet{
IP: net.IPv6zero,
Mask: net.CIDRMask(0, 128),
},
LinkIndex: tunLink.Attrs().Index,
})
if err != nil {
return err
}
}
}
return nil
}
func UnConfigure(name string, inet4Address netip.Prefix, inet6Address netip.Prefix, autoRoute bool) error {
if autoRoute {
tunLink, err := netlink.LinkByName(name)
if err != nil {
return err
}
if inet4Address.IsValid() {
err = netlink.RouteDel(&netlink.Route{
Dst: &net.IPNet{
IP: net.IPv4zero,
Mask: net.CIDRMask(0, 32),
},
LinkIndex: tunLink.Attrs().Index,
})
if err != nil {
return err
}
}
if inet6Address.IsValid() {
err = netlink.RouteDel(&netlink.Route{
Dst: &net.IPNet{
IP: net.IPv6zero,
Mask: net.CIDRMask(0, 128),
},
LinkIndex: tunLink.Attrs().Index,
})
if err != nil {
return err
}
}
}
return nil
}