packetforge: add packetforge for generic flow to extras

Add a new tool packetforge to extras. This tool is to support generic flow.
Packetforge is a library to translate naming or json profile format flow
pattern to the required input of generic flow, i.e. spec and mask. Using
python script flow_create.py, it can add and enable a new flow rule for
an interface via flow VAPI, and can delete an existed flow rule as well.
Command examples are shown below. Json profile examples can be found in
./parsegraph/samples.

Naming format input:
python flow_create.py --add -p "mac()/ipv4(src=1.1.1.1,dst=2.2.2.2)/udp()"
-a "redirect-to-queue 3" -i 1
python flow_create.py --del -i 1 -I 0

Json profile format input:
python flow_create.py -f "./flow_rule_examples/mac_ipv4.json" -i 1

With this command, flow rule can be added or deleted, and the flow
entry can be listed with "show flow entry" command in VPP CLI.

Packetforge is based on a parsegraph. The parsegraph can be built by
users. A Spec can be found in ./parsegraph as guidance. More details
about packetforge are in README file.

Type: feature

Signed-off-by: Ting Xu <ting.xu@intel.com>
Change-Id: Ia9f539741c5dca27ff236f2bcc493c5dd48c0df1

1 files changed, 55 insertions, 0 deletions

diff --git a/extras/packetforge/EdgeAction.py b/extras/packetforge/EdgeAction.py
new file mode 100644
index 00000000000..cf170088a5b
--- /dev/null
+++ b/extras/packetforge/EdgeAction.py
@@ -0,0 +1,55 @@
+# Copyright (c) 2022 Intel 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.
+
+
+class EdgeAction:
+    def __init__(self):
+        self.ToStartObject = None
+        self.ToExpression = None
+        self.FromStartObject = None
+        self.FromExpression = None
+
+    def Create(token):
+        if token == None:
+            return None
+
+        dststr = token["dst"]
+        srcstr = token["src"]
+
+        if srcstr == None or dststr == None:
+            return None
+
+        action = EdgeAction()
+
+        dststr = dststr.strip()
+        srcstr = srcstr.strip()
+
+        if dststr.startswith("start."):
+            action.ToStartObject = True
+            action.ToExpression = dststr[6:]
+        elif dststr.startswith("end."):
+            action.ToStartObject = False
+            action.ToExpression = dststr[4:]
+        else:
+            return None
+
+        if srcstr.startswith("start."):
+            action.FromStartObject = True
+            action.FromExpression = srcstr[6:]
+        elif srcstr.startswith("end."):
+            action.FromStartObject = False
+            action.FromExpression = srcstr[4:]
+        else:
+            action.FromExpression = srcstr
+
+        return action