@Override
void processOFHello(OFHello m) throws IOException {
/*
* Brocade switches send a second hello after
* the controller responds with its hello. This
* might be to confirm the protocol version used,
* but isn't defined in the OF specification.
*
* We will ignore such hello messages assuming
* the version of the hello is correct according
* to the algorithm in the spec.
*
* TODO Brocade also sets the XID of this second
* hello as the same XID the controller used.
* Checking for this might help to assure we're
* really dealing with the situation we think
* we are.
*/
if (m.getVersion().equals(factory.getVersion())) {
log.warn(
"Ignoring second hello from {} in state {}. Might be a Brocade.",
channel.remoteAddress(),
state.toString());
} else {
super.processOFHello(m); /* Versions don't match as they should; abort */
}
}
@Override
void processOFMessage(OFMessage m) throws IOException {
if (m.getType().equals(OFType.PACKET_IN)) {
log.warn(
"Ignoring PACKET_IN message from {} during OpenFlow channel establishment.",
channel.remoteAddress());
} else {
super.processOFMessage(m);
}
}
@Override
public void channelRead0(ChannelHandlerContext ctx, Iterable<OFMessage> msgList)
throws Exception {
for (OFMessage ofm : msgList) {
try {
// Do the actual packet processing
state.processOFMessage(ofm);
} catch (Exception ex) {
// We are the last handler in the stream, so run the
// exception through the channel again by passing in
// ctx.getChannel().
ctx.fireExceptionCaught(ex);
}
}
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
if (e.getMessage() instanceof List) {
@SuppressWarnings("unchecked")
List<OFMessage> msglist = (List<OFMessage>) e.getMessage();
for (OFMessage ofm : msglist) {
try {
// Do the actual packet processing
state.processOFMessage(ofm);
} catch (Exception ex) {
// We are the last handler in the stream, so run the
// exception through the channel again by passing in
// ctx.getChannel().
Channels.fireExceptionCaught(ctx.getChannel(), ex);
}
}
} else {
Channels.fireExceptionCaught(
ctx.getChannel(), new AssertionError("Message received from channel is not a list"));
}
}
/**
* Update the channels state. Only called from the state machine.
*
* @param state
* @throws IOException
*/
private void setState(OFChannelState state) throws IOException {
this.state = state;
state.logState();
state.enterState();
}