// SetLinkNetInNs configures network settings of the link in network namespace specified by PID.
func (l *Link) SetLinkNetInNs(nspid int, ip net.IP, network *net.IPNet, gw *net.IP) error {
origNs, _ := NetNsHandle(os.Getpid())
defer syscall.Close(int(origNs))
defer system.Setns(origNs, syscall.CLONE_NEWNET)
if err := SetNetNsToPid(nspid); err != nil {
return fmt.Errorf("Setting network namespace failed: %s", err)
}
if err := netlink.NetworkLinkAddIp(l.NetInterface(), ip, network); err != nil {
return fmt.Errorf("Unable to set IP: %s in pid: %d network namespace", ip.String(), nspid)
}
if err := netlink.NetworkLinkUp(l.ifc); err != nil {
return fmt.Errorf("Unable to bring %s interface UP: %s", l.ifc.Name, nspid)
}
if gw != nil {
if err := netlink.AddDefaultGw(gw.String(), l.NetInterface().Name); err != nil {
return fmt.Errorf("Unable to set Default gateway: %s in pid: %d network namespace", gw.String(), nspid)
}
}
return nil
}
// SetLinkIp configures the link's IP address.
// It is equivalent of running: ip address add ${address}/${mask} dev ${interface name}
func (l *Link) SetLinkIp(ip net.IP, network *net.IPNet) error {
return netlink.NetworkLinkAddIp(l.NetInterface(), ip, network)
}
// SetPeerLinkIp configures peer link's IP address
func (veth *VethPair) SetPeerLinkIp(ip net.IP, nw *net.IPNet) error {
return netlink.NetworkLinkAddIp(veth.peerIfc, ip, nw)
}
