HONEYCOMB-139: ietf-acl translation layer. IP4 L3 ACL support

Change-Id: I5e5af0d7609aa594790b35a387ec8701f1f6b6df
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

2 files changed, 204 insertions, 0 deletions

diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/acl/AceIp4Writer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/acl/AceIp4Writer.java
new file mode 100644
index 000000000..ac110f98b
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/acl/AceIp4Writer.java
@@ -0,0 +1,203 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.translate.v3po.interfaces.acl;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static io.fd.honeycomb.translate.v3po.util.TranslateUtils.ipv4AddressNoZoneToArray;
+
+import com.google.common.primitives.Ints;
+import javax.annotation.Nonnull;
+import org.apache.commons.lang3.builder.ReflectionToStringBuilder;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.access.control.list.rev160708.access.lists.acl.access.list.entries.ace.actions.PacketHandling;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.access.control.list.rev160708.access.lists.acl.access.list.entries.ace.actions.packet.handling.Permit;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.access.control.list.rev160708.access.lists.acl.access.list.entries.ace.matches.ace.type.AceIp;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.access.control.list.rev160708.access.lists.acl.access.list.entries.ace.matches.ace.type.ace.ip.ace.ip.version.AceIpv4;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
+import org.openvpp.jvpp.core.dto.ClassifyAddDelSession;
+import org.openvpp.jvpp.core.dto.ClassifyAddDelTable;
+import org.openvpp.jvpp.core.dto.InputAclSetInterface;
+import org.openvpp.jvpp.core.future.FutureJVppCore;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+class AceIp4Writer extends AbstractAceWriter<AceIp> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(AceIp4Writer.class);
+    private static final int TABLE_MASK_LENGTH = 48; // number of bytes
+    static final int MATCH_N_VECTORS = 3; // number of 16B vectors
+    static final int TABLE_MEM_SIZE = 8 * 1024;
+    private static final int IP_MASK_LENGTH = 32; // number of bits
+    private static final int IP_VERSION_OFFSET = 14;
+    private static final int DSCP_OFFSET = 15;
+    private static final int SRC_IP_OFFSET = 26;
+    private static final int DST_IP_OFFSET = 30;
+    private static final int IP_VERSION_MASK = 0xf0;
+    private static final int DSCP_MASK = 0xfc;
+
+    public AceIp4Writer(@Nonnull final FutureJVppCore futureJVppCore) {
+        super(futureJVppCore);
+    }
+
+    @Override
+    public ClassifyAddDelTable getClassifyAddDelTableRequest(@Nonnull final PacketHandling action,
+                                                             @Nonnull final AceIp aceIp,
+                                                             @Nonnull final int nextTableIndex) {
+        checkArgument(aceIp.getAceIpVersion() instanceof AceIpv4, "Expected AceIpv4 version, but was %", aceIp);
+        final AceIpv4 ipVersion = (AceIpv4) aceIp.getAceIpVersion();
+
+        final ClassifyAddDelTable request = new ClassifyAddDelTable();
+        request.isAdd = 1;
+        request.tableIndex = -1; // value not present
+
+        request.nbuckets = 1; // we expect exactly one session per table
+
+        if (action instanceof Permit) {
+            request.missNextIndex = 0; // for list of permit rules, deny (0) should be default action
+        } else { // deny is default value
+            request.missNextIndex = -1; // for list of deny rules, permit (-1) should be default action
+        }
+
+        request.nextTableIndex = nextTableIndex;
+        request.skipNVectors = 0; // match entire L2 and L3 header
+        request.matchNVectors = MATCH_N_VECTORS;
+        request.memorySize = TABLE_MEM_SIZE;
+
+        boolean aceIsEmpty = true;
+        request.mask = new byte[TABLE_MASK_LENGTH];
+
+        // First 14 bytes represent l2 header (2x6 + etherType(2)_
+        if (aceIp.getProtocol() != null) { // Internet Protocol number
+            request.mask[IP_VERSION_OFFSET] = (byte) IP_VERSION_MASK; // first 4 bits
+        }
+
+        if (aceIp.getDscp() != null) {
+            aceIsEmpty = false;
+            request.mask[DSCP_OFFSET] = (byte) DSCP_MASK; // first 6 bits
+        }
+
+        if (aceIp.getSourcePortRange() != null) {
+            LOG.warn("L4 Header fields are not supported. Ignoring {}", aceIp.getSourcePortRange());
+        }
+
+        if (aceIp.getDestinationPortRange() != null) {
+            LOG.warn("L4 Header fields are not supported. Ignoring {}", aceIp.getDestinationPortRange());
+        }
+
+        if (ipVersion.getSourceIpv4Network() != null) {
+            aceIsEmpty = false;
+            System.arraycopy(toByteMask(ipVersion.getSourceIpv4Network()), 0, request.mask, SRC_IP_OFFSET, 4);
+        }
+
+        if (ipVersion.getDestinationIpv4Network() != null) {
+            aceIsEmpty = false;
+            System.arraycopy(toByteMask(ipVersion.getDestinationIpv4Network()), 0, request.mask, DST_IP_OFFSET, 4);
+        }
+
+        if (aceIsEmpty) {
+            throw new IllegalArgumentException(
+                String.format("Ace %s does not define packet field matches", aceIp.toString()));
+        }
+
+        if (LOG.isDebugEnabled()) {
+            LOG.debug("ACE action={}, rule={} translated to table={}.", action, aceIp,
+                ReflectionToStringBuilder.toString(request));
+        }
+        return request;
+    }
+
+    @Override
+    public ClassifyAddDelSession getClassifyAddDelSessionRequest(@Nonnull final PacketHandling action,
+                                                                 @Nonnull final AceIp aceIp,
+                                                                 @Nonnull final int tableIndex) {
+        checkArgument(aceIp.getAceIpVersion() instanceof AceIpv4, "Expected AceIpv4 version, but was %", aceIp);
+        final AceIpv4 ipVersion = (AceIpv4) aceIp.getAceIpVersion();
+
+        final ClassifyAddDelSession request = new ClassifyAddDelSession();
+        request.isAdd = 1;
+        request.tableIndex = tableIndex;
+
+        if (action instanceof Permit) {
+            request.hitNextIndex = -1;
+        } // deny (0) is default value
+
+        request.match = new byte[TABLE_MASK_LENGTH];
+        boolean noMatch = true;
+
+        if (aceIp.getProtocol() != null) {
+            request.match[IP_VERSION_OFFSET] = (byte) (IP_VERSION_MASK & (aceIp.getProtocol().intValue() << 4));
+        }
+
+        if (aceIp.getDscp() != null) {
+            noMatch = false;
+            request.match[DSCP_OFFSET] = (byte) (DSCP_MASK & (aceIp.getDscp().getValue() << 2));
+        }
+
+        if (aceIp.getSourcePortRange() != null) {
+            LOG.warn("L4 Header fields are not supported. Ignoring {}", aceIp.getSourcePortRange());
+        }
+
+        if (aceIp.getDestinationPortRange() != null) {
+            LOG.warn("L4 Header fields are not supported. Ignoring {}", aceIp.getDestinationPortRange());
+        }
+
+        if (ipVersion.getSourceIpv4Network() != null) {
+            noMatch = false;
+            System.arraycopy(toMatchValue(ipVersion.getSourceIpv4Network()), 0, request.match, SRC_IP_OFFSET, 4);
+        }
+
+        if (ipVersion.getDestinationIpv4Network() != null) {
+            noMatch = false;
+            System.arraycopy(toMatchValue(ipVersion.getDestinationIpv4Network()), 0, request.match, DST_IP_OFFSET, 4);
+        }
+
+        if (noMatch) {
+            throw new IllegalArgumentException(
+                String.format("Ace %s does not define neither source nor destination MAC address", aceIp.toString()));
+        }
+
+        if (LOG.isDebugEnabled()) {
+            LOG.debug("ACE action={}, rule={} translated to session={}.", action, aceIp,
+                ReflectionToStringBuilder.toString(request));
+        }
+        return request;
+    }
+
+    @Override
+    protected void setClassifyTable(@Nonnull final InputAclSetInterface request, final int tableIndex) {
+        request.ip4TableIndex = tableIndex;
+    }
+
+    private static byte[] toByteMask(final int prefixLength) {
+        final long mask = ((1L << prefixLength) - 1) << (IP_MASK_LENGTH - prefixLength);
+        return Ints.toByteArray((int) mask);
+    }
+
+    private static byte[] toByteMask(final Ipv4Prefix ipv4Prefix) {
+        final int prefixLength = Byte.valueOf(ipv4Prefix.getValue().split("/")[1]);
+        return toByteMask(prefixLength);
+    }
+
+    private static byte[] toMatchValue(final Ipv4Prefix ipv4Prefix) {
+        final String[] split = ipv4Prefix.getValue().split("/");
+        final byte[] addressBytes = ipv4AddressNoZoneToArray(split[0]);
+        final byte[] mask = toByteMask(Byte.valueOf(split[1]));
+        for (int i = 0; i < addressBytes.length; ++i) {
+            addressBytes[i] &= mask[i];
+        }
+        return addressBytes;
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/acl/IetfAClWriter.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/acl/IetfAClWriter.java
index 5eb4af5e1..58741cfeb 100644
--- a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/acl/IetfAClWriter.java
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/acl/IetfAClWriter.java
@@ -64,6 +64,7 @@ public final class IetfAClWriter {
     public IetfAClWriter(@Nonnull final FutureJVppCore futureJVppCore) {
         this.jvpp = Preconditions.checkNotNull(futureJVppCore, "futureJVppCore should not be null");
         aceWriters.put(AclType.ETH, new AceEthWriter(futureJVppCore));
+        aceWriters.put(AclType.IP4, new AceIp4Writer(futureJVppCore));
     }
 
     void deleteAcl(@Nonnull final InstanceIdentifier<?> id, final int swIfIndex)