1 files changed, 74 insertions, 0 deletions
diff --git a/vpp-classifier/impl/src/main/java/io/fd/hc2vpp/vpp/classifier/write/acl/common/AclTranslator.java b/vpp-classifier/impl/src/main/java/io/fd/hc2vpp/vpp/classifier/write/acl/common/AclTranslator.java
new file mode 100644
index 000000000..e75d0af24
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+++ b/vpp-classifier/impl/src/main/java/io/fd/hc2vpp/vpp/classifier/write/acl/common/AclTranslator.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2017 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.hc2vpp.vpp.classifier.write.acl.common;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import io.fd.vpp.jvpp.core.dto.ClassifyAddDelSession;
+import io.fd.vpp.jvpp.core.dto.ClassifyAddDelTable;
+import javax.annotation.Nonnegative;
+import javax.annotation.Nonnull;
+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;
+
+/**
+ * Utility that helps translating of ietf-acl model ACEs to VPP's classify tables and sessions.
+ */
+interface AclTranslator {
+    int TABLE_MEM_SIZE = 8 * 1024;
+    int VLAN_TAG_LEN = 4;
+
+    default ClassifyAddDelTable createTable(final int nextTableIndex) {
+        return createTable(nextTableIndex, 1);
+    }
+
+    default ClassifyAddDelTable createTable(final int nextTableIndex, @Nonnegative final int numberOfSessions) {
+        final ClassifyAddDelTable request = new ClassifyAddDelTable();
+        request.isAdd = 1;
+        request.tableIndex = -1; // value not present
+        request.nbuckets = numberOfSessions;
+        request.nextTableIndex = nextTableIndex;
+
+
+        // TODO: HONEYCOMB-181 minimise memory used by classify tables (we create a lot of them to make ietf-acl model
+        // mapping more convenient):
+        // according to https://wiki.fd.io/view/VPP/Introduction_To_N-tuple_Classifiers#Creating_a_classifier_table,
+        // classify table needs 16*(1 + match_n_vectors) bytes, but this does not quite work,
+        // so setting 8K +1k*numberOfSessions for now
+        checkArgument(numberOfSessions>0, "negative numberOfSessions %s", numberOfSessions);
+        request.memorySize = TABLE_MEM_SIZE+1024*(numberOfSessions-1);
+        request.missNextIndex = -1; // value not set, but anyway it is ignored for tables in chain
+        return request;
+    }
+
+    default ClassifyAddDelSession createSession(@Nonnull final PacketHandling action, final int tableIndex) {
+        final ClassifyAddDelSession request = new ClassifyAddDelSession();
+        request.isAdd = 1;
+        request.tableIndex = tableIndex;
+        request.opaqueIndex = ~0; // value not used
+
+        if (action instanceof Permit) {
+            request.hitNextIndex = -1;
+        } // deny (0) is default value
+
+        return request;
+    }
+
+    default int getVlanTagsLen(final int vlanTags) {
+        return vlanTags * VLAN_TAG_LEN;
+    }
+}