137 lines
3.1 KiB
Go
137 lines
3.1 KiB
Go
package controller
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import (
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"context"
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"fmt"
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"github.com/golang/protobuf/ptypes"
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"github.com/golang/protobuf/ptypes/any"
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api "github.com/osrg/gobgp/api"
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gobgp "github.com/osrg/gobgp/pkg/server"
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"net"
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)
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type Controller struct {
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peerAS int
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localIP, peerIP net.IP
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s *gobgp.BgpServer
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}
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func NewController(localAS, peerAS int, peerIP string) (*Controller, error) {
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c := &Controller{}
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if peerIP == "" {
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gw, err := gateway()
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if err != nil {
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return nil, err
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}
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c.peerIP = gw
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} else {
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c.peerIP = net.ParseIP(peerIP)
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}
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if c.peerIP == nil {
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return nil, fmt.Errorf("Unable to get peer IP")
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}
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s := gobgp.NewBgpServer()
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go s.Serve()
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localAddr, err := localAddress(c.peerIP)
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if err != nil {
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return nil, err
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}
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c.localIP = localAddr
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if err := s.StartBgp(context.Background(), &api.StartBgpRequest{
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Global: &api.Global{
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As: uint32(localAS),
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RouterId: localAddr.String(),
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ListenPort: -1, // gobgp won't listen on tcp:179
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},
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}); err != nil {
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return nil, fmt.Errorf("Unable to start bgp: %v", err)
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}
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c.s = s
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c.peerAS = peerAS
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return c, nil
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}
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func (c *Controller) AddPeer(peer string) error {
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n := &api.Peer{
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Conf: &api.PeerConf{
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NeighborAddress: peer,
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PeerAs: uint32(c.peerAS),
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},
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}
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return c.s.AddPeer(context.Background(), &api.AddPeerRequest{Peer: n})
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}
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func (c *Controller) getApiPath(route *net.IPNet) *api.Path {
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afi := api.Family_AFI_IP
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if route.IP.To4() == nil {
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afi = api.Family_AFI_IP6
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}
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prefixlen, _ := route.Mask.Size()
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nlri, _ := ptypes.MarshalAny(&api.IPAddressPrefix{
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Prefix: route.IP.String(),
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PrefixLen: uint32(prefixlen),
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})
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a1, _ := ptypes.MarshalAny(&api.OriginAttribute{
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Origin: 0,
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})
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a2, _ := ptypes.MarshalAny(&api.NextHopAttribute{
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NextHop: c.localIP.String(),
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})
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attrs := []*any.Any{a1, a2}
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return &api.Path{
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Family: &api.Family{Afi: afi, Safi: api.Family_SAFI_UNICAST},
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AnyNlri: nlri,
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AnyPattrs: attrs,
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}
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}
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func (c *Controller) Announce(route *net.IPNet) error {
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peers, err := c.s.ListPeer(context.Background(), &api.ListPeerRequest{})
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if err != nil {
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return err
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}
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var found bool
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for _, p := range peers {
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if p.Conf.NeighborAddress == c.peerIP.String() {
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found = true
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break
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}
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}
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if !found {
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if err := c.AddPeer(c.peerIP.String()); err != nil {
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return err
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}
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}
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_, err = c.s.AddPath(context.Background(), &api.AddPathRequest{Path: c.getApiPath(route)})
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return err
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}
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func (c *Controller) Withdraw(route *net.IPNet) error {
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return c.s.DeletePath(context.Background(), &api.DeletePathRequest{Path: c.getApiPath(route)})
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}
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func (c *Controller) PeerInfo() (*api.Peer, error) {
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peers, err := c.s.ListPeer(context.Background(), &api.ListPeerRequest{})
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if err != nil {
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return nil, err
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}
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for _, p := range peers {
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if p.Conf.NeighborAddress == c.peerIP.String() {
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return p, nil
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}
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}
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return nil, nil
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}
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func (c *Controller) Shutdown() error {
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if err := c.s.ShutdownPeer(context.Background(), &api.ShutdownPeerRequest{
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Address: c.peerIP.String(),
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}); err != nil {
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return err
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}
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if err := c.s.StopBgp(context.Background(), &api.StopBgpRequest{}); err != nil {
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return err
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}
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return nil
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}
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