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# Copyright 2013, Big Switch Networks, Inc.
#
# LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with
# the following special exception:
#
# LOXI Exception
#
# As a special exception to the terms of the EPL, you may distribute libraries
# generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided
# that copyright and licensing notices generated by LoxiGen are not altered or removed
# from the LoxiGen Libraries and the notice provided below is (i) included in
# the LoxiGen Libraries, if distributed in source code form and (ii) included in any
# documentation for the LoxiGen Libraries, if distributed in binary form.
#
# Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler."
#
# You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain
# a copy of the EPL at:
#
# http://www.eclipse.org/legal/epl-v10.html
#
# 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
# EPL for the specific language governing permissions and limitations
# under the EPL.
import os
from collections import namedtuple
import loxi_utils.loxi_utils as utils
import loxi_front_end
import of_g
from loxi_ir import *
import field_info
templates_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'templates')
DissectorField = namedtuple("DissectorField", ["fullname", "name", "type", "base", "enum_table"])
proto_names = { 1: 'of10', 2: 'of11', 3: 'of12', 4: 'of13' }
def make_field_name(wire_version, ofclass_name, member_name):
return "%s.%s.%s" % (proto_names[wire_version],
ofclass_name[3:],
member_name)
def get_reader(version, cls, m):
"""
Decide on a reader function to use for the given field
"""
ofproto = of_g.ir[version]
enum = ofproto.enum_by_name(m.oftype)
if enum and 'wire_type' in enum.params:
return "read_" + enum.params['wire_type']
else:
return "read_" + m.oftype.replace(')', '').replace('(', '_')
def get_field_info(version, cls, name, oftype):
"""
Decide on a Wireshark type and base for a given field.
Returns (type, base)
"""
if oftype.startswith("list"):
return "bytes", "NONE", "nil"
ofproto = of_g.ir[version]
enum = ofproto.enum_by_name(oftype)
if not enum and (cls, name) in field_info.class_field_to_enum:
enum_name = field_info.class_field_to_enum[(cls, name)]
enum = ofproto.enum_by_name(enum_name)
if enum:
field_type = "uint32"
elif oftype in field_info.oftype_to_wireshark_type:
field_type = field_info.oftype_to_wireshark_type[oftype]
else:
print "WARN missing oftype_to_wireshark_type for", oftype
field_type = "bytes"
if enum:
if enum.is_bitmask:
field_base = "HEX"
else:
field_base = "DEC"
elif oftype in field_info.field_to_base:
field_base = field_info.field_to_base[name]
elif oftype in field_info.oftype_to_base:
field_base = field_info.oftype_to_base[oftype]
else:
print "WARN missing oftype_to_base for", oftype
field_base = "NONE"
if enum:
enum_table = 'enum_v%d_%s' % (version, enum.name)
else:
enum_table = 'nil'
return field_type, field_base, enum_table
def create_fields():
r = []
for wire_version, ofproto in of_g.ir.items():
for ofclass in ofproto.classes:
for m in ofclass.members:
if isinstance(m, OFPadMember):
continue
fullname = make_field_name(wire_version, ofclass.name, m.name)
field_type, field_base, enum_table = get_field_info(wire_version, ofclass.name, m.name, m.oftype)
r.append(DissectorField(fullname, m.name, field_type, field_base, enum_table))
return r
def generate():
context = {
'fields': create_fields(),
}
with utils.open_output('openflow.lua') as out:
utils.render_template(out, "openflow.lua", [templates_dir], context)