func (fsm *FSM) sendNotificationFromErrorMsg(e *bgp.MessageError) error {
if fsm.h != nil && fsm.h.conn != nil {
m := bgp.NewBGPNotificationMessage(e.TypeCode, e.SubTypeCode, e.Data)
b, _ := m.Serialize()
_, err := fsm.h.conn.Write(b)
if err == nil {
fsm.bgpMessageStateUpdate(m.Header.Type, false)
fsm.h.sentNotification = bgp.NewNotificationErrorCode(e.TypeCode, e.SubTypeCode).String()
}
fsm.h.conn.Close()
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": fsm.pConf.Config.NeighborAddress,
"Data": e,
}).Warn("sent notification")
return nil
}
return fmt.Errorf("can't send notification to %s since TCP connection is not established", fsm.pConf.Config.NeighborAddress)
}
func (h *FSMHandler) recvMessageWithError() (*FsmMsg, error) {
sendToErrorCh := func(reason FsmStateReason) {
// probably doesn't happen but be cautious
select {
case h.errorCh <- reason:
default:
}
}
headerBuf, err := readAll(h.conn, bgp.BGP_HEADER_LENGTH)
if err != nil {
sendToErrorCh(FSM_READ_FAILED)
return nil, err
}
hd := &bgp.BGPHeader{}
err = hd.DecodeFromBytes(headerBuf)
if err != nil {
h.fsm.bgpMessageStateUpdate(0, true)
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"State": h.fsm.state.String(),
"error": err,
}).Warn("malformed BGP Header")
fmsg := &FsmMsg{
MsgType: FSM_MSG_BGP_MESSAGE,
MsgSrc: h.fsm.pConf.Config.NeighborAddress,
MsgData: err,
Version: h.fsm.version,
}
return fmsg, err
}
bodyBuf, err := readAll(h.conn, int(hd.Len)-bgp.BGP_HEADER_LENGTH)
if err != nil {
sendToErrorCh(FSM_READ_FAILED)
return nil, err
}
now := time.Now()
m, err := bgp.ParseBGPBody(hd, bodyBuf)
if err == nil {
h.fsm.bgpMessageStateUpdate(m.Header.Type, true)
err = bgp.ValidateBGPMessage(m)
} else {
h.fsm.bgpMessageStateUpdate(0, true)
}
fmsg := &FsmMsg{
MsgType: FSM_MSG_BGP_MESSAGE,
MsgSrc: h.fsm.pConf.Config.NeighborAddress,
timestamp: now,
Version: h.fsm.version,
}
if err != nil {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"State": h.fsm.state.String(),
"error": err,
}).Warn("malformed BGP message")
fmsg.MsgData = err
} else {
fmsg.MsgData = m
if h.fsm.state == bgp.BGP_FSM_ESTABLISHED {
switch m.Header.Type {
case bgp.BGP_MSG_ROUTE_REFRESH:
fmsg.MsgType = FSM_MSG_ROUTE_REFRESH
case bgp.BGP_MSG_UPDATE:
body := m.Body.(*bgp.BGPUpdate)
confedCheck := !config.IsConfederationMember(h.fsm.gConf, h.fsm.pConf) && config.IsEBGPPeer(h.fsm.gConf, h.fsm.pConf)
_, err := bgp.ValidateUpdateMsg(body, h.fsm.rfMap, confedCheck)
if err != nil {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"State": h.fsm.state.String(),
"error": err,
}).Warn("malformed BGP update message")
fmsg.MsgData = err
} else {
// FIXME: we should use the original message for bmp/mrt
table.UpdatePathAttrs4ByteAs(body)
err := table.UpdatePathAggregator4ByteAs(body)
if err == nil {
fmsg.PathList = table.ProcessMessage(m, h.fsm.peerInfo, fmsg.timestamp)
id := h.fsm.pConf.Config.NeighborAddress
for _, path := range fmsg.PathList {
if path.IsEOR() {
continue
}
if h.fsm.policy.ApplyPolicy(id, table.POLICY_DIRECTION_IN, path, nil) == nil {
path.Filter(id, table.POLICY_DIRECTION_IN)
}
}
} else {
fmsg.MsgData = err
}
}
fmsg.payload = make([]byte, len(headerBuf)+len(bodyBuf))
copy(fmsg.payload, headerBuf)
copy(fmsg.payload[len(headerBuf):], bodyBuf)
fallthrough
case bgp.BGP_MSG_KEEPALIVE:
// if the length of h.holdTimerResetCh
// isn't zero, the timer will be reset
// soon anyway.
select {
case h.holdTimerResetCh <- true:
default:
}
if m.Header.Type == bgp.BGP_MSG_KEEPALIVE {
return nil, nil
}
case bgp.BGP_MSG_NOTIFICATION:
body := m.Body.(*bgp.BGPNotification)
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": h.fsm.pConf.Config.NeighborAddress,
"Code": body.ErrorCode,
"Subcode": body.ErrorSubcode,
"Data": body.Data,
}).Warn("received notification")
sendToErrorCh(FsmStateReason(fmt.Sprintf("%s %s", FSM_NOTIFICATION_RECV, bgp.NewNotificationErrorCode(body.ErrorCode, body.ErrorSubcode).String())))
return nil, nil
}
}
}
return fmsg, err
}
func (h *FSMHandler) sendMessageloop() error {
conn := h.conn
fsm := h.fsm
ticker := keepaliveTicker(fsm)
send := func(m *bgp.BGPMessage) error {
if fsm.twoByteAsTrans && m.Header.Type == bgp.BGP_MSG_UPDATE {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": fsm.pConf.Config.NeighborAddress,
"State": fsm.state.String(),
"Data": m,
}).Debug("update for 2byte AS peer")
table.UpdatePathAttrs2ByteAs(m.Body.(*bgp.BGPUpdate))
table.UpdatePathAggregator2ByteAs(m.Body.(*bgp.BGPUpdate))
}
b, err := m.Serialize()
if err != nil {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": fsm.pConf.Config.NeighborAddress,
"State": fsm.state.String(),
"Data": err,
}).Warn("failed to serialize")
fsm.bgpMessageStateUpdate(0, false)
return nil
}
if err := conn.SetWriteDeadline(time.Now().Add(time.Second * time.Duration(fsm.pConf.Timers.State.NegotiatedHoldTime))); err != nil {
h.errorCh <- FSM_WRITE_FAILED
conn.Close()
return fmt.Errorf("failed to set write deadline")
}
_, err = conn.Write(b)
if err != nil {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": fsm.pConf.Config.NeighborAddress,
"State": fsm.state.String(),
"Data": err,
}).Warn("failed to send")
h.errorCh <- FSM_WRITE_FAILED
conn.Close()
return fmt.Errorf("closed")
}
fsm.bgpMessageStateUpdate(m.Header.Type, false)
switch m.Header.Type {
case bgp.BGP_MSG_NOTIFICATION:
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": fsm.pConf.Config.NeighborAddress,
"State": fsm.state.String(),
"Data": m,
}).Warn("sent notification")
body := m.Body.(*bgp.BGPNotification)
h.errorCh <- FsmStateReason(fmt.Sprintf("%s %s", FSM_NOTIFICATION_SENT, bgp.NewNotificationErrorCode(body.ErrorCode, body.ErrorSubcode).String()))
conn.Close()
return fmt.Errorf("closed")
case bgp.BGP_MSG_UPDATE:
update := m.Body.(*bgp.BGPUpdate)
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": fsm.pConf.Config.NeighborAddress,
"State": fsm.state.String(),
"nlri": update.NLRI,
"withdrawals": update.WithdrawnRoutes,
"attributes": update.PathAttributes,
}).Debug("sent update")
default:
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": fsm.pConf.Config.NeighborAddress,
"State": fsm.state.String(),
"data": m,
}).Debug("sent")
}
return nil
}
for {
select {
case <-h.t.Dying():
return nil
case o := <-h.outgoing.Out():
m := o.(*FsmOutgoingMsg)
for _, msg := range table.CreateUpdateMsgFromPaths(m.Paths) {
if err := send(msg); err != nil {
return nil
}
}
if m.Notification != nil {
if m.StayIdle {
// current user is only prefix-limit
// fix me if this is not the case
h.changeAdminState(ADMIN_STATE_PFX_CT)
}
if err := send(m.Notification); err != nil {
return nil
}
}
case <-ticker.C:
if err := send(bgp.NewBGPKeepAliveMessage()); err != nil {
return nil
}
}
}
}