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, 162 insertions, 0 deletions

diff --git a/extras/packetforge/ExpressionConverter.py b/extras/packetforge/ExpressionConverter.py
new file mode 100644
index 00000000000..1f9c73fedfa
--- /dev/null
+++ b/extras/packetforge/ExpressionConverter.py
@@ -0,0 +1,162 @@
+# 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.
+
+from InputFormat import InputFormat
+
+
+def ByteArrayToString(data):
+    if len(data) == 0:
+        return ""
+
+    sb = []
+
+    for i in range(len(data) - 1):
+        sb.append("%02x" % data[i])
+
+    sb.append("%02x" % data[len(data) - 1])
+
+    return sb
+
+
+def ToNum(exp):
+    if exp == None:
+        return True, None
+
+    exp = exp.strip()
+
+    if exp.startswith("0x"):
+        out = int(exp, 16)
+    else:
+        try:
+            out = int(exp)
+        except:
+            return False, None
+
+    return True, out
+
+
+def ToIPv4Address(exp):
+    ipv4 = [0] * 4
+
+    exp = exp.strip()
+    tokens = exp.split(".")
+
+    if len(tokens) != 4:
+        return False, bytes(4)
+
+    for i in range(4):
+        u8 = int(tokens[i])
+        if u8 == None:
+            return False, bytes(4)
+
+        ipv4[i] = u8
+
+    return True, bytes(ipv4)
+
+
+def ToIPv6Address(exp):
+    ipv6 = [0] * 16
+
+    exp = exp.strip()
+    tokens = exp.split(":")
+
+    if len(tokens) != 8:
+        return False, bytes(16)
+
+    for i in range(8):
+        u16 = int(tokens[i], 16)
+        if u16 == None:
+            return False, bytes(16)
+
+        ipv6[i * 2] = u16 >> 8
+        ipv6[i * 2 + 1] = u16 & 0xFF
+
+    return True, bytes(ipv6)
+
+
+def ToMacAddress(exp):
+    mac = [0] * 6
+
+    exp = exp.strip()
+    tokens = exp.split(":")
+
+    if len(tokens) != 6:
+        return False, bytes(6)
+
+    for i in range(6):
+        u8 = int(tokens[i], 16)
+        if u8 == None:
+            return False, bytes(6)
+
+        mac[i] = u8
+
+    return True, bytes(mac)
+
+
+def ToByteArray(exp):
+    exp = exp.strip()
+    tokens = exp.split(",")
+
+    tmp = [] * len(tokens)
+
+    for i in range(len(tokens)):
+        _, num = ToNum(tokens[i])
+        if num == 0:
+            return False, bytes(len(tokens))
+
+        tmp[i] = ToNum(tokens[i])
+
+    return True, bytes(tmp)
+
+
+def Verify(format, expression):
+    if (
+        format == InputFormat.u8
+        or format == InputFormat.u16
+        or format == InputFormat.u32
+        or format == InputFormat.u64
+    ):
+        return ToNum(expression)
+    elif format == InputFormat.ipv4:
+        return ToIPv4Address(expression)
+    elif format == InputFormat.ipv6:
+        return ToIPv6Address(expression)
+    elif format == InputFormat.mac:
+        return ToMacAddress(expression)
+    elif format == InputFormat.bytearray:
+        return ToByteArray(expression)
+    else:
+        return False, 0
+
+
+def IncreaseValue(expression, size):
+    if expression == None:
+        return str(size)
+
+    _, num = ToNum(expression)
+    return str(num + size)
+
+
+def Equal(exp, val):
+    if exp == None:
+        num_1 = 0
+    else:
+        _, num_1 = ToNum(exp)
+        if not num_1:
+            return False
+
+    _, num_2 = ToNum(val)
+    if not num_2:
+        return False
+
+    return num_1 == num_2