1 files changed, 142 insertions, 0 deletions
diff --git a/build/neutron/agent/l3/namespaces.py b/build/neutron/agent/l3/namespaces.py
new file mode 100644
index 00000000..aa282052
--- /dev/null
+++ b/build/neutron/agent/l3/namespaces.py
@@ -0,0 +1,142 @@
+# Copyright 2015 Hewlett-Packard Development Company, L.P.
+#
+#    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.
+#
+
+import functools
+
+from oslo_log import log as logging
+from oslo_utils import excutils
+
+from neutron.agent.linux.interface import OVSInterfaceDriver
+from neutron._i18n import _LE, _LW
+from neutron.agent.linux import ip_lib
+
+LOG = logging.getLogger(__name__)
+
+NS_PREFIX = 'qrouter-'
+INTERNAL_DEV_PREFIX = 'qr-'
+EXTERNAL_DEV_PREFIX = 'qg-'
+# TODO(Carl) It is odd that this file needs this.  It is a dvr detail.
+ROUTER_2_FIP_DEV_PREFIX = 'rfp-'
+
+
+def build_ns_name(prefix, identifier):
+    """Builds a namespace name from the given prefix and identifier
+
+    :param prefix: The prefix which must end with '-' for legacy reasons
+    :param identifier: The id associated with the namespace
+    """
+    return prefix + identifier
+
+
+def get_prefix_from_ns_name(ns_name):
+    """Parses prefix from prefix-identifier
+
+    :param ns_name: The name of a namespace
+    :returns: The prefix ending with a '-' or None if there is no '-'
+    """
+    dash_index = ns_name.find('-')
+    if 0 <= dash_index:
+        return ns_name[:dash_index + 1]
+
+
+def get_id_from_ns_name(ns_name):
+    """Parses identifier from prefix-identifier
+
+    :param ns_name: The name of a namespace
+    :returns: Identifier or None if there is no - to end the prefix
+    """
+    dash_index = ns_name.find('-')
+    if 0 <= dash_index:
+        return ns_name[dash_index + 1:]
+
+
+def check_ns_existence(f):
+    @functools.wraps(f)
+    def wrapped(self, *args, **kwargs):
+        if not self.exists():
+            LOG.warning(_LW('Namespace %(name)s does not exists. Skipping '
+                            '%(func)s'),
+                        {'name': self.name, 'func': f.__name__})
+            return
+        try:
+            return f(self, *args, **kwargs)
+        except RuntimeError:
+            with excutils.save_and_reraise_exception() as ctx:
+                if not self.exists():
+                    LOG.debug('Namespace %(name)s was concurrently deleted',
+                              self.name)
+                    ctx.reraise = False
+    return wrapped
+
+
+class Namespace(object):
+
+    def __init__(self, name, agent_conf, driver, use_ipv6):
+        self.name = name
+        self.ip_wrapper_root = ip_lib.IPWrapper()
+        self.agent_conf = agent_conf
+        self.driver = driver
+        self.use_ipv6 = use_ipv6
+
+    def create(self):
+        ip_wrapper = self.ip_wrapper_root.ensure_namespace(self.name)
+        cmd = ['sysctl', '-w', 'net.ipv4.ip_forward=1']
+        ip_wrapper.netns.execute(cmd)
+        if self.use_ipv6:
+            cmd = ['sysctl', '-w', 'net.ipv6.conf.all.forwarding=1']
+            ip_wrapper.netns.execute(cmd)
+
+    def delete(self):
+        try:
+            self.ip_wrapper_root.netns.delete(self.name)
+        except RuntimeError:
+            msg = _LE('Failed trying to delete namespace: %s')
+            LOG.exception(msg, self.name)
+
+    def exists(self):
+        return self.ip_wrapper_root.netns.exists(self.name)
+
+
+class RouterNamespace(Namespace):
+
+    def __init__(self, router_id, agent_conf, driver, use_ipv6, ovs_driver):
+        self.router_id = router_id
+        self.ovs_driver = ovs_driver
+        name = self._get_ns_name(router_id)
+        super(RouterNamespace, self).__init__(
+            name, agent_conf, driver, use_ipv6)
+
+    @classmethod
+    def _get_ns_name(cls, router_id):
+        return build_ns_name(NS_PREFIX, router_id)
+
+    @check_ns_existence
+    def delete(self):
+        ns_ip = ip_lib.IPWrapper(namespace=self.name)
+        for d in ns_ip.get_devices(exclude_loopback=True):
+            if d.name.startswith(INTERNAL_DEV_PREFIX):
+                # device is on default bridge
+                self.driver.unplug(d.name, namespace=self.name,
+                                   prefix=INTERNAL_DEV_PREFIX)
+            elif d.name.startswith(ROUTER_2_FIP_DEV_PREFIX):
+                ns_ip.del_veth(d.name)
+            elif d.name.startswith(EXTERNAL_DEV_PREFIX):
+                self.ovs_driver.unplug(
+                    d.name,
+                    bridge=self.agent_conf.external_network_bridge,
+                    namespace=self.name,
+                    prefix=EXTERNAL_DEV_PREFIX)
+
+        super(RouterNamespace, self).delete()