func (c *Context) validateNoTunnel() {
policies, err := netlink.XfrmPolicyList(netlink.FAMILY_ALL)
if err != nil {
c.Fatalf("Failed to get policies: %v", err)
}
if len(policies) != 0 {
c.Fatalf("Policies not removed")
}
states, err := netlink.XfrmStateList(netlink.FAMILY_ALL)
if err != nil {
c.Fatalf("Failed to get states: %v", err)
}
if len(states) != 0 {
c.Fatalf("States not removed")
}
}
func (o *Overlay) getRules() (map[string]netlink.XfrmPolicy, error) {
policies := map[string]netlink.XfrmPolicy{}
existing, err := netlink.XfrmPolicyList(0)
if err != nil {
return nil, err
}
for _, policy := range existing {
if policy.Dir != netlink.XFRM_DIR_IN && policy.Dir != netlink.XFRM_DIR_FWD && policy.Dir != netlink.XFRM_DIR_OUT {
continue
}
policies[toKey(&policy)] = policy
}
return policies, nil
}
func (c *Context) validateTunnel(udp bool) {
policies, err := netlink.XfrmPolicyList(netlink.FAMILY_ALL)
if err != nil {
c.Fatalf("Failed to get policies: %v", err)
}
if len(policies) != 4 {
c.Fatalf("Wrong number of policies found: %v", policies)
}
c.validatePolicy(policies[0], "127.0.0.2", "127.0.0.1")
c.validatePolicy(policies[1], "127.0.0.1", "127.0.0.2")
c.validatePolicy(policies[2], "127.0.0.1", "127.0.0.2")
c.validatePolicy(policies[3], "127.0.0.2", "127.0.0.1")
states, err := netlink.XfrmStateList(netlink.FAMILY_ALL)
if err != nil {
c.Fatalf("Failed to get states: %v", err)
}
if len(states) != 2 {
c.Fatalf("Wrong number of states found: %v", states)
}
c.validateState(states[0], "127.0.0.1", "127.0.0.2", udp)
c.validateState(states[1], "127.0.0.2", "127.0.0.1", udp)
}
func discoverTunnels() {
glog.Infof("Discovering existing tunnels")
lo, err := netlink.LinkByName("lo")
if err != nil {
glog.Errorf("Failed to get loopback device: %v", err)
return
}
addrs, err := netlink.AddrList(lo, netlink.FAMILY_ALL)
if err != nil {
glog.Errorf("Failed to get addrs: %v", err)
return
}
routes, err := netlink.RouteList(nil, netlink.FAMILY_ALL)
if err != nil {
glog.Errorf("Failed to get routes: %v", err)
return
}
policies, err := netlink.XfrmPolicyList(netlink.FAMILY_ALL)
if err != nil {
glog.Errorf("Failed to get xfrm policies: %v", err)
return
}
states, err := netlink.XfrmStateList(netlink.FAMILY_ALL)
if err != nil {
glog.Errorf("Failed to get xfrm states: %v", err)
return
}
for _, addr := range addrs {
if opts.cidr.Contains(addr.IP) {
tunnel := client.Tunnel{}
tunnel.Src = addr.IP
err := reserveIP(tunnel.Src)
if err != nil {
glog.Warningf("Duplicate tunnel ip detected: %v", tunnel.Src)
}
tunnel.Dst = nil
glog.Infof("Potential tunnel found from %s", tunnel.Src)
for _, route := range routes {
if route.Src == nil || !route.Src.Equal(tunnel.Src) {
continue
}
tunnel.Dst = route.Dst.IP
break
}
if tunnel.Dst == nil {
glog.Warningf("could not find dst for tunnel src %s", tunnel.Src)
continue
}
err = reserveIP(tunnel.Dst)
if err != nil {
glog.Warningf("Duplicate tunnel ip detected: %v", tunnel.Dst)
}
var dst net.IP
for _, policy := range policies {
if !policy.Dst.IP.Equal(tunnel.Dst) {
continue
}
if len(policy.Tmpls) == 0 {
glog.Warningf("Tunnel policy has no associated template")
continue
}
dst = policy.Tmpls[0].Dst
break
}
if dst == nil {
glog.Warningf("could not find ip for tunnel between %s and %s", tunnel.Src, tunnel.Dst)
continue
}
for _, state := range states {
if !state.Dst.Equal(dst) {
continue
}
tunnel.Reqid = state.Reqid
if state.Auth == nil {
glog.Warningf("Tunnel state has no associated authentication entry")
continue
}
tunnel.AuthKey = state.Auth.Key
if state.Crypt == nil {
glog.Warningf("Tunnel state has no associated encryption entry")
continue
}
tunnel.EncKey = state.Crypt.Key
if state.Encap != nil {
tunnel.SrcPort = state.Encap.SrcPort
tunnel.SrcPort = state.Encap.DstPort
}
glog.Infof("Discovered tunnel between %v and %v over %v", tunnel.Src, tunnel.Dst, dst)
var socket int
if tunnel.SrcPort != 0 {
socket, err = createEncapListener(tunnel.Src, tunnel.SrcPort)
if err != nil {
glog.Warningf("Failed to create udp listener: %v", err)
}
}
addTunnel(dst.String(), &tunnel, socket)
break
}
}
}
glog.Infof("Finished discovering existing tunnels")
}