public static unsafe void Write32(byte[] arr, uint offset, bit32 value)
{
fixed(byte *p = &arr[offset])
{
*((uint *)p) = value.Value;
}
}
//action Set_nhop(out IPv4Address nextHop, // NOTE directioned parameters must be bound in the actions list specification (so not by api?)
// IPv4Address ipv4_dest, // NOTE directionless parameters bound by control plane
// PortId port)
//{
// nextHop = ipv4_dest;
// headers.ip.ttl = headers.ip.ttl - 1;
// outCtrl.outputPort = port;
//}
private static void Set_nhop(TopPipe_Args args,
ref IPv4Address nextHop,
IPv4Address ipv4_dest,
PortId port)
{
nextHop = ipv4_dest;
args.headers.ip.ttl = new bit8((byte)(args.headers.ip.ttl.Value - 1));
args.outCtrl.outputPort = port;
}
public override void Extract(byte[] arr, uint offset)
{
version = (bit4)BitHelper.ExtractBits(arr, offset * 8, 4);
ihl = (bit4)BitHelper.ExtractBits(arr, offset * 8 + 4, 4);
diffserv = BitHelper.Extract8(arr, offset + 1);
totalLen = BitHelper.Extract16(arr, offset + 2);
identification = BitHelper.Extract16(arr, offset + 4);
flags = (bit3)BitHelper.ExtractBits(arr, offset + 48, 3);
fragOffset = BitHelper.ExtractBits(arr, offset + 51, 13);
ttl = BitHelper.Extract8(arr, offset + 8);
protocol = BitHelper.Extract8(arr, offset + 9);
hdrChecksum = BitHelper.Extract16(arr, offset + 10);
srcAddr = BitHelper.Extract32(arr, offset + 12);
dstAddr = BitHelper.Extract32(arr, offset + 16);
}
public apply_result apply(TopPipe_Args args, IPv4Address nextHop)
{
apply_result result;
ActionBase RA = table.Lookup(nextHop);
if (RA == null)
{
result = new apply_result(false, default_action.Action);
}
else
{
result = new apply_result(true, RA.Action);
}
//evaluate_and_copy_in_RA_args(RA);
//execute(RA);
//copy_out_RA_args(RA);
//copy_out_table_args(args);
RA.OnApply(args);
return(result);
}
public void apply(ref Parsed_packet headers,
core.error parseError, // parser error
InControl inCtrl, // input port
out OutControl outCtrl)
{
outCtrl = new OutControl(); // NOTE instantiate all out params to satisfy csc
TopPipe_Args args = new TopPipe_Args(headers, parseError, inCtrl, outCtrl);
IPv4Address nextHop = new IPv4Address(); // Have to instantiate ref params, more compact than using out params and instantiating at bottom
if (parseError != error.NoError)
{
Drop_action(args);
return;
}
ipv4_match.apply(args, ref nextHop);
if (args.outCtrl.outputPort == DROP_PORT)
{
return;
}
check_ttl.apply(args);
if (args.outCtrl.outputPort == CPU_OUT_PORT)
{
return;
}
dmac.apply(args, nextHop);
if (args.outCtrl.outputPort == DROP_PORT)
{
return;
}
smac.apply(args);
// Copy params back out
headers = args.headers;
outCtrl = args.outCtrl;
}
public apply_result apply(TopPipe_Args args, ref IPv4Address nextHop)
{
// FIXME sort out copy-semantics for args
apply_result result;
// Would chain lookups here if multiple fields
ActionBase RA = table.Lookup(args.headers.ip.dstAddr);
if (RA == null)
{
result = new apply_result(false, default_action.Action);
}
else
{
result = new apply_result(true, RA.Action);
}
//evaluate_and_copy_in_RA_args(RA);
//execute(RA);
//copy_out_RA_args(RA);
//copy_out_table_args(args);
RA.OnApply(args, ref nextHop);
return(result);
}
public override void OnApply(TopPipe_Args args, ref IPv4Address nextHop) // FIXME need to bind parameters from control plane...
{
Set_nhop(args, ref nextHop, ipv4_dest, port);
}
public Set_nhop_Action(IPv4Address ipv4_dest, PortId port) : base(action_list.Set_nhop)
{
this.ipv4_dest = ipv4_dest;
this.port = port;
}
public override void OnApply(TopPipe_Args args, ref IPv4Address nextHop)
{
// FIXME this action doesn't actually set the out param - how do we handle that?
Drop_action(args);
}
public abstract void OnApply(TopPipe_Args args, ref IPv4Address nextHop);
