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# 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 vpp_papi.vpp_papi import VppEnum
from ParseGraph import *
from Path import *
import json
import re
import os
parsegraph_path = os.getcwd() + "/parsegraph"
def Forge(pattern, actions, file_flag):
pg = ParseGraph.Create(parsegraph_path)
if pg == None:
print("error: create parsegraph failed")
return None
if not file_flag:
token = ParsePattern(pattern)
if token == None:
return None
else:
if not os.path.exists(pattern):
print("error: file not exist '%s' " % (pattern))
return
f = open(pattern, "r", encoding="utf-8")
token = json.load(f)
if "actions" in token:
actions = token["actions"]
path = Path.Create(token)
if path == None:
print("error: path not exit")
return None
result = pg.Forge(path)
if result == None:
print("error: result not available")
return None
spec, mask = GetBinary(result.ToJSON())
# create generic flow
my_flow = {
"type": VppEnum.vl_api_flow_type_v2_t.FLOW_TYPE_GENERIC_V2,
"flow": {
"generic": {
"pattern": {"spec": bytes(spec.encode()), "mask": bytes(mask.encode())}
}
},
}
# update actions entry
my_flow = GetAction(actions, my_flow)
return my_flow
def GetAction(actions, flow):
if len(actions.split(" ")) > 1:
type = actions.split(" ")[0]
else:
type = actions
if type == "mark":
flow.update(
{
"actions": VppEnum.vl_api_flow_action_v2_t.FLOW_ACTION_MARK_V2,
"mark_flow_id": int(actions.split(" ")[1]),
}
)
elif type == "next-node":
flow.update(
{
"actions": VppEnum.vl_api_flow_action_v2_t.FLOW_ACTION_REDIRECT_TO_NODE_V2,
"redirect_node_index": int(actions.split(" ")[1]),
}
)
elif type == "buffer-advance":
flow.update(
{
"actions": VppEnum.vl_api_flow_action_v2_t.FLOW_ACTION_BUFFER_ADVANCE_V2,
"buffer_advance": int(actions.split(" ")[1]),
}
)
elif type == "redirect-to-queue":
flow.update(
{
"actions": VppEnum.vl_api_flow_action_v2_t.FLOW_ACTION_REDIRECT_TO_QUEUE_V2,
"redirect_queue": int(actions.split(" ")[1]),
}
)
elif type == "rss":
flow.update({"actions": VppEnum.vl_api_flow_action_v2_t.FLOW_ACTION_RSS_V2})
elif type == "rss-queues":
queue_end = int(actions.split(" ")[-1])
queue_start = int(actions.split(" ")[-3])
flow.update(
{
"actions": VppEnum.vl_api_flow_action_v2_t.FLOW_ACTION_RSS_V2,
"queue_index": queue_start,
"queue_num": queue_end - queue_start + 1,
}
)
elif type == "drop":
flow.update({"actions": VppEnum.vl_api_flow_action_v2_t.FLOW_ACTION_DROP_V2})
return flow
def GetBinary(flow_info):
spec = "".join(flow_info["Packet"])
mask = "".join(flow_info["Mask"])
return spec, mask
def ParseFields(item):
# get protocol name
prot = item.split("(")[0]
stack = {"header": prot}
# get fields contents
fields = re.findall(r"[(](.*?)[)]", item)
if not fields:
print("error: invalid pattern")
return None
if fields == [""]:
return stack
stack.update({"fields": []})
return ParseStack(stack, fields[0].split(","))
def GetMask(item):
if "format" in item:
format = item["format"]
if format == "mac":
mask = "ff.ff.ff.ff.ff.ff"
elif format == "ipv4":
mask = "255.255.255.255"
elif format == "ipv6":
mask = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
return mask
if "size" in item:
mask = str((1 << int(item["size"])) - 1)
else:
print("mask error")
return mask
# parse protocol headers and its fields. Available fields are defined in corresponding nodes.
def ParseStack(stack, fields):
prot = stack["header"]
node_path = parsegraph_path + "/nodes/" + prot + ".json"
if not os.path.exists(node_path):
print("error file not exist '%s' " % (node_path))
return None
f = open(node_path, "r", encoding="utf-8")
nodeinfo = json.load(f)
for field in fields:
fld_name = field.split("=")[0].strip()
fld_value = (
field.split("=")[-1].strip() if (len(field.split("=")) >= 2) else None
)
for item in nodeinfo["layout"]:
if fld_name == item["name"]:
mask = GetMask(item)
stack["fields"].append(
{"name": fld_name, "value": fld_value, "mask": mask}
)
break
if not stack["fields"]:
print("warning: invalid field '%s'" % (fld_name))
return None
return stack
def ParsePattern(pattern):
# create json template
json_tmp = {"type": "path", "stack": []}
items = pattern.split("/")
for item in items:
stack = ParseFields(item)
if stack == None:
return None
json_tmp["stack"].append(stack)
return json_tmp
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