bgp: enable to propagate ipv4 networks

Newly add an api network.add to add a ipv4 network to propagate.
Networks can be registered in configure file using networks direction

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/services/protocols/bgp/api/rtconf.py

@@ -167,3 +167,15 @@ def get_vrf(route_dist, route_family=VRF_RF_IPV4):
 def get_vrfs_conf():
     vrfs_conf = CORE_MANAGER.vrfs_conf
     return vrfs_conf.settings
+
+#==============================================================================
+# network configuration related APIs
+#==============================================================================
+
+@register(name='network.add')
+def add_network(prefix):
+    tm = CORE_MANAGER.get_core_service().table_manager
+    tm.add_to_ipv4_global_table(prefix)
+    return True
+
+

ryu/services/protocols/bgp/application.py

@@ -165,6 +165,9 @@ class BaseApplication(object):
             # Add Vrfs.
             self._add_vrfs(routing_settings)
 
+            # Add Networks
+            self._add_networks(routing_settings)
+
     def _add_neighbors(self, routing_settings):
         """Add bgp peers/neighbors from given settings to BGPS runtime.
 
@@ -196,3 +199,18 @@ class BaseApplication(object):
             except RuntimeConfigError as e:
                 LOG.error(e)
                 continue
+
+    def _add_networks(self, routing_settings):
+        """Add networks from given settings to BGPS runtime.
+
+        If any of the networks are miss-configured errors are logged.
+        All valid networks are loaded.
+        """
+        networks = routing_settings.setdefault('networks', [])
+        for prefix in networks:
+            try:
+                call('network.add', prefix=prefix)
+                LOG.debug('Added network %s' % str(prefix))
+            except RuntimeConfigError as e:
+                LOG.error(e)
+                continue

ryu/services/protocols/bgp/core_managers/table_manager.py

@@ -1,4 +1,5 @@
 import logging
+from collections import OrderedDict
 
 from ryu.services.protocols.bgp.base import SUPPORTED_GLOBAL_RF
 from ryu.services.protocols.bgp.info_base.rtc import RtcTable
@@ -13,6 +14,7 @@ from ryu.services.protocols.bgp.info_base.vrf6 import Vrf6Table
 from ryu.services.protocols.bgp.rtconf import vrfs
 from ryu.services.protocols.bgp.rtconf.vrfs import VRF_RF_IPV4
 from ryu.services.protocols.bgp.rtconf.vrfs import VRF_RF_IPV6
+from ryu.services.protocols.bgp.protocols.bgp import pathattr
 from ryu.services.protocols.bgp.protocols.bgp import nlri
 from ryu.services.protocols.bgp.utils.validation import is_valid_ipv4
 from ryu.services.protocols.bgp.utils.validation import is_valid_ipv4_prefix
@@ -468,6 +470,24 @@ class TableCoreManager(object):
             gen_lbl=True
         )
 
+    def add_to_ipv4_global_table(self, prefix):
+        _nlri = nlri.Ipv4(prefix)
+        src_ver_num = 1
+        peer = None
+        # set mandatory path attributes
+        nexthop = pathattr.NextHop("0.0.0.0")
+        origin = pathattr.Origin('igp')
+        aspath = pathattr.AsPath([[]])
+
+        pathattrs = OrderedDict()
+        pathattrs[origin.ATTR_NAME] = origin
+        pathattrs[aspath.ATTR_NAME] = aspath
+
+        new_path = Ipv4Path(peer, _nlri, src_ver_num,
+                            pattrs=pathattrs, nexthop=nexthop)
+        # add to global ipv4 table and propagates to neighbors
+        self.learn_path(new_path)
+
     def remove_from_vrf(self, route_dist, prefix, route_family):
         """Removes `prefix` from VRF identified by `route_dist`.