Based off generic l3_agent (neutron/agent/l3_agent) code

import netaddr

from neutron.agent import l3_agent

from neutron.agent.linux import utils

from neutron.agent.solaris import interface

from neutron.agent.solaris import ipfilters_manager

from neutron.agent.solaris import net_lib

from neutron.common import constants as l3_constants

from neutron.openstack.common import log as logging

FLOATING_IP_CIDR_SUFFIX = '/32'

        self._snat_enabled = None

        self._snat_action = None

        # We do not need either root_helper or namespace, so set them to None

        self.root_helper = None

        self.use_namespaces = None

        # Invoke the setter for establishing initial SNAT action

        self.ipfilters_manager = ipfilters_manager.IPfiltersManager()

    @property

    def router(self):

        return self._router

    @router.setter

    def router(self, value):

        self._router = value

        if not self._router:

            return

        # enable_snat by default if it wasn't specified by plugin

        self._snat_enabled = self._router.get('enable_snat', True)

        # Set a SNAT action for the router

        if self._router.get('gw_port'):

            self._snat_action = ('add_rules' if self._snat_enabled

                                 else 'remove_rules')

        elif self.ex_gw_port:

            # Gateway port was removed, remove rules

            self._snat_action = 'remove_rules'

    def ns_name(self):

        pass

    def perform_snat_action(self, snat_callback, *args):

        # Process SNAT rules for attached subnets

        if self._snat_action:

            snat_callback(self, self._router.get('gw_port'),

                          *args, action=self._snat_action)

        self._snat_action = None

    def process_router(self, ri):

        ex_gw_port = self._get_ex_gw_port(ri)

        internal_ports = ri.router.get(l3_constants.INTERFACE_KEY, [])

        existing_port_ids = set([p['id'] for p in ri.internal_ports])

        current_port_ids = set([p['id'] for p in internal_ports

                                if p['admin_state_up']])

        new_ports = [p for p in internal_ports if

                     p['id'] in current_port_ids and

                     p['id'] not in existing_port_ids]

        old_ports = [p for p in ri.internal_ports if

                     p['id'] not in current_port_ids]

        for p in new_ports:

            self._set_subnet_info(p)

            ri.internal_ports.append(p)

            self.internal_network_added(ri, p)

        for p in old_ports:

            ri.internal_ports.remove(p)

            self.internal_network_removed(ri, p)

        internal_cidrs = [p['ip_cidr'] for p in ri.internal_ports]

        # TODO(salv-orlando): RouterInfo would be a better place for

        # this logic too

        ex_gw_port_id = (ex_gw_port and ex_gw_port['id'] or

                         ri.ex_gw_port and ri.ex_gw_port['id'])

        interface_name = None

        if ex_gw_port_id:

            interface_name = self.get_external_device_name(ex_gw_port_id)

        if ex_gw_port and not ri.ex_gw_port:

            self._set_subnet_info(ex_gw_port)

            self.external_gateway_added(ri, ex_gw_port,

                                        interface_name, internal_cidrs)

        elif not ex_gw_port and ri.ex_gw_port:

            self.external_gateway_removed(ri, ri.ex_gw_port,

                                          interface_name, internal_cidrs)

        # We don't need this since our IPnat rules are bi-directional

        # Process SNAT rules for external gateway

        # ri.perform_snat_action(self._handle_router_snat_rules,

        #                       internal_cidrs, interface_name)

        # Process DNAT rules for floating IPs

        if ex_gw_port:

            self.process_router_floating_ips(ri, ex_gw_port)

        ri.ex_gw_port = ex_gw_port

        ri.enable_snat = ri.router.get('enable_snat')

        self.routes_updated(ri)

    def process_router_floating_ips(self, ri, ex_gw_port):

        """Configure the router's floating IPs

        Configures floating ips using ipnat(1m) on the router's gateway device.

        Cleans up floating ips that should not longer be configured.

        """

        ifname = self.get_external_device_name(ex_gw_port['id'])

        ipintf = net_lib.IPInterface(ifname)

        ipaddr_list = ipintf.ipaddr_list()['static']

        # Clear out all ipnat rules for floating ips

        ri.ipfilters_manager.remove_nat_rules(ri.ipfilters_manager.ipv4['nat'])

        existing_cidrs = set([addr for addr in ipaddr_list])

        new_cidrs = set()

        # Loop once to ensure that floating ips are configured.

        for fip in ri.router.get(l3_constants.FLOATINGIP_KEY, []):

            fip_ip = fip['floating_ip_address']

            fip_cidr = str(fip_ip) + FLOATING_IP_CIDR_SUFFIX

            new_cidrs.add(fip_cidr)

            if fip_cidr not in existing_cidrs:

                ipintf.create_address(fip_cidr)

            # Rebuild iptables rules for the floating ip.

            fixed_cidr = str(fip['fixed_ip_address']) + '/32'

            nat_rules = ['bimap %s %s -> %s' % (ifname, fixed_cidr, fip_cidr)]

            ri.ipfilters_manager.add_nat_rules(nat_rules)

        # Clean up addresses that no longer belong on the gateway interface.

        for ip_cidr in existing_cidrs - new_cidrs:

            if ip_cidr.endswith(FLOATING_IP_CIDR_SUFFIX):

                ipintf.delete_address(ip_cidr)

        # please see the comment above

    def external_gateway_added(self, ri, ex_gw_port,

                               external_dlname, internal_cidrs):

        if not net_lib.Datalink.datalink_exists(external_dlname):

            dl = net_lib.Datalink(external_dlname)

            # need to determine the VLAN ID for the VNIC

            evsname = ex_gw_port['network_id']

            tenantname = ex_gw_port['tenant_id']

            cmd = ['/usr/sbin/evsadm', 'show-evs', '-co', 'vid',

                   '-f', 'tenant=%s' % tenantname, evsname]

            try:

                stdout = utils.execute(cmd)

            except Exception as err:

                LOG.error(_("Failed to retrieve the VLAN ID associated "

                            "with the external network, and it is required "

                            "to create external gateway port: %s") % err)

                return

            vid = stdout.splitlines()[0].strip()

            if vid == "":

                LOG.error(_("External Network does not has a VLAN ID "

                            "associated with it, and it is required to "

                            "create external gateway port"))

                return

            mac_address = ex_gw_port['mac_address']

            dl.create_vnic(self.conf.external_network_datalink,

                           mac_address=mac_address, vid=vid)

        self.driver.init_l3(external_dlname, [ex_gw_port['ip_cidr']])

        # TODO(gmoodalb): wrap route(1m) command within a class in net_lib.py

        gw_ip = ex_gw_port['subnet']['gateway_ip']

        if gw_ip:

            cmd = ['/usr/bin/pfexec', '/usr/sbin/route', 'add', 'default',

                   gw_ip]

            utils.execute(cmd, check_exit_code=False)

    def external_gateway_removed(self, ri, ex_gw_port,

                                 external_dlname, internal_cidrs):

        if net_lib.Datalink.datalink_exists(external_dlname):

            self.driver.fini_l3(external_dlname)

            self.driver.unplug(external_dlname)

        gw_ip = ex_gw_port['subnet']['gateway_ip']

        if gw_ip:

            cmd = ['/usr/bin/pfexec', '/usr/sbin/route', 'delete', 'default',

                   gw_ip]

            utils.execute(cmd, check_exit_code=False)

    def internal_network_added(self, ri, port):

                        oip['tenant_id'] == port['tenant_id']):

    def internal_network_removed(self, ri, port):

                    internal_port['tenant_id'] == port['tenant_id']):

            subnet_cidr = internal_port['subnet']['cidr']

            ri.ipfilters_manager.remove_ippool(ippool_name, [subnet_cidr])

    def routers_updated(self, context, routers):

        super(EVSL3NATAgent, self).routers_updated(context, routers)

        if routers:

            # If router's interface was removed, then the VNIC associated

            # with that interface must be deleted immediately. The EVS

            # plugin can delete the virtual port iff the VNIC associated

            # with that virtual port is deleted first.

            self._rpc_loop()