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tap_linux.go
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tap_linux.go
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package tap
import (
"fmt"
"io"
"net"
tap_util "github.com/dolfly/x/internal/util/tap"
"github.com/songgao/water"
"github.com/vishvananda/netlink"
)
func (l *tapListener) createTap() (dev io.ReadWriteCloser, name string, ip net.IP, err error) {
tap, err := water.New(water.Config{
DeviceType: water.TAP,
PlatformSpecificParams: water.PlatformSpecificParams{
Name: l.md.config.Name,
},
})
if err != nil {
return
}
dev = tap
name = tap.Name()
ifce, err := net.InterfaceByName(name)
if err != nil {
return
}
link, err := netlink.LinkByName(name)
if err != nil {
return
}
if err = netlink.LinkSetMTU(link, l.md.config.MTU); err != nil {
return
}
if l.md.config.Net != "" {
var ipNet *net.IPNet
ip, ipNet, err = net.ParseCIDR(l.md.config.Net)
if err != nil {
return
}
if err = netlink.AddrAdd(link, &netlink.Addr{
IPNet: &net.IPNet{
IP: ip,
Mask: ipNet.Mask,
},
}); err != nil {
return
}
}
if err = netlink.LinkSetUp(link); err != nil {
return
}
if err = l.addRoutes(ifce, l.md.config.Routes...); err != nil {
return
}
return
}
func (l *tapListener) addRoutes(ifce *net.Interface, routes ...tap_util.Route) error {
for _, route := range routes {
r := netlink.Route{
Dst: &route.Net,
Gw: route.Gateway,
}
if r.Gw == nil {
r.LinkIndex = ifce.Index
}
if err := netlink.RouteReplace(&r); err != nil {
return fmt.Errorf("add route %v %v: %v", r.Dst, r.Gw, err)
}
}
return nil
}