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Shashikanth VH
Committed by Gerrit Code Review
447c6b0e 1 parent 2b49e944

BGP connection collision detection. 

Change-Id: I124674b79170450409df5d0f4b5fea5f9e11f1d9
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Showing 2 changed files with 83 additions and 25 deletions
......@@ -151,7 +151,9 @@ class BGPNotificationMsgVer4 implements BGPNotificationMsg {
@Override
public Builder setData(byte[] data) {
this.data = data;
if (data != null) {
this.data = data;
}
return this;
}
......
......@@ -23,8 +23,8 @@ import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.nio.channels.ClosedChannelException;
import java.util.Collections;
import java.util.List;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.concurrent.RejectedExecutionException;
......@@ -153,8 +153,8 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
if (m.getType() != BGPType.OPEN) {
// When the message type is not keep alive message increment the wrong packet statistics
h.processUnknownMsg(BGPErrorType.FINITE_STATE_MACHINE_ERROR,
BGPErrorType.RECEIVE_UNEXPECTED_MESSAGE_IN_OPENSENT_STATE, m.getType()
.getType());
BGPErrorType.RECEIVE_UNEXPECTED_MESSAGE_IN_OPENSENT_STATE,
m.getType().getType());
log.debug("Message is not OPEN message");
} else {
log.debug("Sending keep alive message in OPENSENT state");
......@@ -165,6 +165,11 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
// validate capabilities and open msg
if (h.openMsgValidation(h, pOpenmsg)) {
if (h.connectionCollisionDetection(BGPPeerCfg.State.OPENCONFIRM,
h.peerIdentifier, h.peerAddr)) {
h.channel.close();
return;
}
log.debug("Sending handshake OPEN message");
/*
......@@ -203,8 +208,8 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
// check for open message
if (m.getType() != BGPType.OPEN) {
// When the message type is not open message increment the wrong packet statistics
h.processUnknownMsg(BGPErrorType.FINITE_STATE_MACHINE_ERROR, BGPErrorType.UNSPECIFIED_ERROR, m
.getType().getType());
h.processUnknownMsg(BGPErrorType.FINITE_STATE_MACHINE_ERROR, BGPErrorType.UNSPECIFIED_ERROR,
m.getType().getType());
log.debug("Message is not OPEN message");
} else {
h.bgpPacketStats.addInPacket();
......@@ -214,6 +219,11 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
// Validate open message
if (h.openMsgValidation(h, pOpenmsg)) {
if (h.connectionCollisionDetection(BGPPeerCfg.State.OPENSENT,
h.peerIdentifier, h.peerAddr)) {
h.channel.close();
return;
}
log.debug("Sending handshake OPEN message");
/*
......@@ -237,6 +247,7 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
h.sendHandshakeOpenMessage();
h.bgpPacketStats.addOutPacket();
h.setState(OPENCONFIRM);
h.bgpconfig.setPeerConnState(h.peerAddr, BGPPeerCfg.State.OPENCONFIRM);
}
}
}
......@@ -250,8 +261,8 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
if (m.getType() != BGPType.KEEP_ALIVE) {
// When the message type is not keep alive message handle the wrong packet
h.processUnknownMsg(BGPErrorType.FINITE_STATE_MACHINE_ERROR,
BGPErrorType.RECEIVE_UNEXPECTED_MESSAGE_IN_OPENCONFIRM_STATE, m.getType()
.getType());
BGPErrorType.RECEIVE_UNEXPECTED_MESSAGE_IN_OPENCONFIRM_STATE,
m.getType().getType());
log.debug("Message is not KEEPALIVE message");
} else {
......@@ -281,7 +292,7 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
if (h.negotiatedHoldTime != 0) {
h.keepAliveTimer = new BGPKeepAliveTimer(h,
(h.negotiatedHoldTime / BGP_MAX_KEEPALIVE_INTERVAL));
(h.negotiatedHoldTime / BGP_MAX_KEEPALIVE_INTERVAL));
} else {
h.sendKeepAliveMessage();
}
......@@ -292,13 +303,6 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
h.setHandshakeComplete(true);
if (!h.peerManager.addConnectedPeer(h.thisbgpId, h.bgpPeer)) {
/*
* RFC 4271, Section 6.8, Based on the value of the BGP identifier, a convention is established
* for detecting which BGP connection is to be preserved when a collision occurs. The convention
* is to compare the BGP Identifiers of the peers involved in the collision and to retain only
* the connection initiated by the BGP speaker with the higher-valued BGP Identifier..
*/
// TODO: Connection collision handling.
disconnectDuplicate(h);
} else {
h.setState(ESTABLISHED);
......@@ -374,6 +378,7 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
// Connection should establish only if local ip and Autonomous system number is configured.
if (bgpconfig.getState() != BGPCfg.State.IP_AS_CONFIGURED) {
sendNotification(BGPErrorType.CEASE, BGPErrorType.CONNECTION_REJECTED, null);
channel.close();
log.info("BGP local AS and router ID not configured");
return;
......@@ -385,6 +390,7 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
// if peer is not configured disconnect session
if (!bgpconfig.isPeerConfigured(peerAddr)) {
log.debug("Peer is not configured {}", peerAddr);
sendNotification(BGPErrorType.CEASE, BGPErrorType.CONNECTION_REJECTED, null);
channel.close();
return;
}
......@@ -436,6 +442,25 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
if (bgpPeer != null) {
peerManager.removeConnectedPeer(thisbgpId);
}
// Retry connection if connection is lost to bgp speaker/peer
if ((channel != null) && (null != channel.getPipeline().get("ActiveHandler"))) {
BgpConnectPeerImpl connectPeer;
BGPPeerCfg.State peerCfgState;
peerCfgState = bgpconfig.getPeerConnState(peerAddr);
// on session disconnect using configuration, do not retry
if (!peerCfgState.equals(BGPPeerCfg.State.IDLE)) {
log.debug("Connection reset by peer, retry, STATE:{}", peerCfgState);
BGPPeerConfig peerConfig = (BGPPeerConfig) bgpconfig.displayPeers(peerAddr);
bgpconfig.setPeerConnState(peerAddr, BGPPeerCfg.State.IDLE);
connectPeer = new BgpConnectPeerImpl(bgpController, peerAddr, Controller.getBgpPortNum());
peerConfig.setConnectPeer(connectPeer);
}
} else {
bgpconfig.setPeerConnState(peerAddr, BGPPeerCfg.State.IDLE);
}
} else {
// A duplicate was disconnected on this ChannelHandler,
// this is the same peer reconnecting, but the original state was
......@@ -448,6 +473,7 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
keepAliveTimer.getKeepAliveTimer().cancel();
}
} else {
bgpconfig.setPeerConnState(peerAddr, BGPPeerCfg.State.IDLE);
log.warn("No bgp ip in channelHandler registered for " + "disconnected peer {}", getPeerInfoString());
}
}
......@@ -521,6 +547,39 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
}
}
/**
* Check for connection collision.
*
* @param state connection state
* @param peerIdentifier BGP peer identifier
* @param peerAddr BGP peer address
* @return true if bgp spreakers initiated connection
* @throws BGPParseException on error while procession collision detection
* @throws IOException on error while procession collision detection
*/
public boolean connectionCollisionDetection(BGPPeerCfg.State state, int peerIdentifier, String peerAddr)
throws IOException, BGPParseException {
/*
* RFC 4271, Section 6.8, Based on the value of the BGP identifier, a convention is established for detecting
* which BGP connection is to be preserved when a collision occurs. The convention is to compare the BGP
* Identifiers of the peers involved in the collision and to retain only the connection initiated by the BGP
* speaker with the higher-valued BGP Identifier..
*/
BGPPeerCfg.State currentState = bgpconfig.getPeerConnState(peerAddr);
if (currentState.equals(state)) {
if (((Ip4Address.valueOf(bgpconfig.getRouterId())).compareTo(Ip4Address.valueOf(peerIdentifier))) > 0) {
// send notification
sendNotification(BGPErrorType.CEASE, BGPErrorType.CONNECTION_COLLISION_RESOLUTION, null);
log.debug("Connection collision detected, local id: {}, peer id: {}, peer state:{}, in state:{}",
(Ip4Address.valueOf(bgpconfig.getRouterId())), (Ip4Address.valueOf(peerIdentifier)),
currentState, state);
return true;
}
}
return false;
}
// *************************
// Channel utility methods
// *************************
......@@ -603,10 +662,8 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
bgpId = Ip4Address.valueOf(bgpconfig.getRouterId()).toInt();
BGPMessage msg = factory4.openMessageBuilder().setAsNumber((short) bgpconfig.getAsNumber())
.setHoldTime(bgpconfig.getHoldTime()).setBgpId(bgpId)
.setLsCapabilityTlv(bgpconfig.getLsCapability())
.setLargeAsCapabilityTlv(bgpconfig.getLargeASCapability())
.build();
.setHoldTime(bgpconfig.getHoldTime()).setBgpId(bgpId).setLsCapabilityTlv(bgpconfig.getLsCapability())
.setLargeAsCapabilityTlv(bgpconfig.getLargeASCapability()).build();
log.debug("Sending open message to {}", channel.getRemoteAddress());
channel.write(Collections.singletonList(msg));
......@@ -621,9 +678,9 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
* @throws IOException, BGPParseException while building message
*/
private void sendNotification(byte errorCode, byte errorSubCode, byte[] data)
throws IOException, BGPParseException {
BGPMessage msg = factory4.notificationMessageBuilder().setErrorCode(errorCode).setErrorSubCode(errorSubCode)
.setData(data).build();
throws IOException, BGPParseException {
BGPMessage msg = factory4.notificationMessageBuilder().setErrorCode(errorCode)
.setErrorSubCode(errorSubCode).setData(data).build();
log.debug("Sending notification message to {}", channel.getRemoteAddress());
channel.write(Collections.singletonList(msg));
}
......@@ -757,8 +814,7 @@ class BGPChannelHandler extends IdleStateAwareChannelHandler {
BGPValueType tlv = unSupportedCaplistIterator.next();
tlv.write(buffer);
}
throw new BGPParseException(BGPErrorType.OPEN_MESSAGE_ERROR,
BGPErrorType.UNSUPPORTED_CAPABILITY, buffer);
throw new BGPParseException(BGPErrorType.OPEN_MESSAGE_ERROR, BGPErrorType.UNSUPPORTED_CAPABILITY, buffer);
} else {
return true;
}
......