95 lines
3.5 KiB
Python
95 lines
3.5 KiB
Python
# Copyright 2013 VMware, Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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from oslo_config import cfg
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from oslo_log import log as logging
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import sqlalchemy as sa
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from sqlalchemy import sql
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from neutron.db import db_base_plugin_v2
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from neutron.db import l3_db
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from neutron.extensions import l3
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LOG = logging.getLogger(__name__)
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OPTS = [
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cfg.BoolOpt('enable_snat_by_default', default=True,
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help=_('Define the default value of enable_snat if not '
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'provided in external_gateway_info.'))
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]
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cfg.CONF.register_opts(OPTS)
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EXTERNAL_GW_INFO = l3.EXTERNAL_GW_INFO
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# Modify the Router Data Model adding the enable_snat attribute
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setattr(l3_db.Router, 'enable_snat',
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sa.Column(sa.Boolean, default=True, server_default=sql.true(),
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nullable=False))
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class L3_NAT_dbonly_mixin(l3_db.L3_NAT_dbonly_mixin):
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"""Mixin class to add configurable gateway modes."""
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# Register dict extend functions for ports and networks
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db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs(
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l3.ROUTERS, ['_extend_router_dict_gw_mode'])
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def _extend_router_dict_gw_mode(self, router_res, router_db):
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if router_db.gw_port_id:
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nw_id = router_db.gw_port['network_id']
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router_res[EXTERNAL_GW_INFO] = {
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'network_id': nw_id,
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'enable_snat': router_db.enable_snat,
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'external_fixed_ips': [
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{'subnet_id': ip["subnet_id"],
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'ip_address': ip["ip_address"]}
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for ip in router_db.gw_port['fixed_ips']
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]
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}
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def _update_router_gw_info(self, context, router_id, info, router=None):
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# Load the router only if necessary
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if not router:
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router = self._get_router(context, router_id)
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with context.session.begin(subtransactions=True):
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router.enable_snat = self._get_enable_snat(info)
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# Calls superclass, pass router db object for avoiding re-loading
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super(L3_NAT_dbonly_mixin, self)._update_router_gw_info(
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context, router_id, info, router=router)
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# Returning the router might come back useful if this
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# method is overridden in child classes
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return router
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@staticmethod
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def _get_enable_snat(info):
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if info and 'enable_snat' in info:
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return info['enable_snat']
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# if enable_snat is not specified then use the default value
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return cfg.CONF.enable_snat_by_default
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def _build_routers_list(self, context, routers, gw_ports):
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for rtr in routers:
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gw_port_id = rtr['gw_port_id']
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# Collect gw ports only if available
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if gw_port_id and gw_ports.get(gw_port_id):
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rtr['gw_port'] = gw_ports[gw_port_id]
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# Add enable_snat key
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rtr['enable_snat'] = rtr[EXTERNAL_GW_INFO]['enable_snat']
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return routers
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class L3_NAT_db_mixin(L3_NAT_dbonly_mixin, l3_db.L3_NAT_db_mixin):
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pass
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