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# Copyright (C) 2013 Nippon Telegraph and Telephone Corporation.
# Copyright (C) 2013 Isaku Yamahata <yamahata at private email ne jp>
#
# 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 os_ken.lib.packet import ethernet
from os_ken.lib.packet import vlan
from os_ken.ofproto import ether
from os_ken.topology import api as topo_api
def may_add_vlan(packet, vlan_id):
"""
:type packet: os_ken.lib.packet.packet.Packet
:param packet:
:type vlan_id: int (0 <= vlan_id <= 4095) or None (= No VLAN)
:param vlan_id:
"""
if vlan_id is None:
return
e = packet.protocols[0]
assert isinstance(e, ethernet.ethernet)
v = vlan.vlan(0, 0, vlan_id, e.ethertype)
e.ethertype = ether.ETH_TYPE_8021Q
packet.add_protocol(v)
def get_dp(app, dpid):
"""
:type dpid: datapath id
:param dpid:
:rtype: os_ken.controller.controller.Datapath
:returns: datapath corresponding to dpid
"""
switches = topo_api.get_switch(app, dpid)
if not switches:
return None
assert len(switches) == 1
return switches[0].dp
def dp_packet_out(dp, port_no, data):
# OF 1.2
ofproto = dp.ofproto
ofproto_parser = dp.ofproto_parser
actions = [ofproto_parser.OFPActionOutput(port_no,
ofproto.OFPCML_NO_BUFFER)]
packet_out = ofproto_parser.OFPPacketOut(
dp, 0xffffffff, ofproto.OFPP_CONTROLLER, actions, data)
dp.send_msg(packet_out)
def dp_flow_mod(dp, table, command, priority, match, instructions,
out_port=None):
# OF 1.2
ofproto = dp.ofproto
ofproto_parser = dp.ofproto_parser
if out_port is None:
out_port = ofproto.OFPP_ANY
flow_mod = ofproto_parser.OFPFlowMod(
dp, 0, 0, table, command, 0, 0,
priority, 0xffffffff, out_port, ofproto.OFPG_ANY,
ofproto.OFPFF_CHECK_OVERLAP, match, instructions)
dp.send_msg(flow_mod)
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