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tap_linux.go
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tap_linux.go
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package tap
import (
"net"
"github.com/docker/libcontainer/netlink"
"github.com/milosgajdos/tenus"
"github.com/songgao/water"
)
func (l *tapListener) createTap() (ifce *water.Interface, ip net.IP, err error) {
var ipNet *net.IPNet
if l.md.config.Net != "" {
ip, ipNet, err = net.ParseCIDR(l.md.config.Net)
if err != nil {
return
}
}
ifce, err = water.New(water.Config{
DeviceType: water.TAP,
PlatformSpecificParams: water.PlatformSpecificParams{
Name: l.md.config.Name,
},
})
if err != nil {
return
}
link, err := tenus.NewLinkFrom(ifce.Name())
if err != nil {
return
}
l.logger.Debugf("ip link set dev %s mtu %d", ifce.Name(), l.md.config.MTU)
if err = link.SetLinkMTU(l.md.config.MTU); err != nil {
return
}
if l.md.config.Net != "" {
l.logger.Debugf("ip address add %s dev %s", l.md.config.Net, ifce.Name())
if err = link.SetLinkIp(ip, ipNet); err != nil {
return
}
}
l.logger.Debugf("ip link set dev %s up", ifce.Name())
if err = link.SetLinkUp(); err != nil {
return
}
if err = l.addRoutes(ifce.Name(), l.md.config.Gateway, l.md.config.Routes...); err != nil {
return
}
return
}
func (l *tapListener) addRoutes(ifName string, gw string, routes ...string) error {
for _, route := range routes {
l.logger.Debugf("ip route add %s via %s dev %s", route, gw, ifName)
if err := netlink.AddRoute(route, "", gw, ifName); err != nil {
return err
}
}
return nil
}