openstack/charm-interface-bgp
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dist: trusty
language: python
script:
- pep8 .
- flake8 .

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README Normal file
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# Overview
This is a interface for use with implementing BGP releations between Juju
Charms.
Take a look at the Quagga Charm for example usage.

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interface.yaml Normal file
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name: bgp
summary: BGP interface
version: 1
repo: https://github.com/fnordahl/interface-bgp.git

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# Copyright 2018 Frode Nordahl
#
# 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 charmhelpers.core as ch_core
import charmhelpers.contrib.network.ip as ch_net_ip
from charms import reactive
import netaddr
class BGPEndpoint(reactive.Endpoint):
def generate_asn(self):
"""
Generate unique 32-bit Private Use [RFC6996] ASn.
This is useful to automate configuration of BGP routers that is part
of a Clos Network Topology with a Layer 3-Only routed design. [RFC7938]
Assumption:
- Unit has a IPv4 address and it is unique to the deployment.
Implementation:
- A private 32-bit ASn has a range of 4 200 000 000 - 4 294 967 294
which leaves us with 94 967 294 possible endpoints.
- Within a deployment it is less likelly that the 4 most significant
bits of the IP address differ between units.
- If we cap the 4 most significant bits of the IPv4 address to be
within the range of 0 and 4, the decimal representation of the
resulting IPv4 address fits nicely into that range.
Note:
- This implementation generates ASn in the following range:
4 211 081 215 - 4 294 967 294
- Leaving the following range for any static configuration needs:
4 200 000 000 - 4 211 081 214
"""
asn_base = 4211081215
mask = netaddr.IPAddress('5.255.255.255')
unit_ip = netaddr.IPAddress(
ch_core.hookenv.unit_get('private-address'))
masked_ip = unit_ip & mask
asn = asn_base + int(masked_ip)
# XXX: This assert should be removed from code and put in a unit test
assert asn <= 4294967294
return asn
def publish_info(self, asn=None):
"""
Publish the AS Number and IP address of any extra-bindings of this
BGP Endpoint over the relationship.
If no AS Number is provided a unique 32-bit Private Use [RFC6996] ASn
will be generated.
"""
if asn:
myasn = asn
else:
myasn = self.generate_asn()
# network_get will return addresses for extra-bindings regardless of
# extra-bindings being bound to a network space. detect actual space
# bindings by comparing returned addresses to what we have for the
# relation itself.
for relation in self.relations:
rel_network = ch_core.hookenv.network_get(
self.expand_name('{endpoint_name}'),
relation_id=relation.relation_id)
rel_addrs = [a['address']
for a in
rel_network['bind-addresses'][0]['addresses']]
extra_bindings = []
for binding in ch_core.hookenv.metadata()['extra-bindings']:
bind_network = ch_core.hookenv.network_get(
binding,
relation_id=relation.relation_id)
bind_addrs = [a['address']
for a in
bind_network['bind-addresses'][0]['addresses']]
if not set(bind_addrs).issubset(set(rel_addrs)):
extra_bindings.extend(
bind_network['bind-addresses'][0]['addresses'])
relation.to_publish['asn'] = myasn
relation.to_publish['extra_bindings'] = extra_bindings
def get_received_info(self):
neighbors = []
for relation in self.relations:
for unit in relation.units:
if not ('asn' in unit.received and
'extra_bindings' in unit.received):
ch_core.hookenv.log('Skip get_received_info() '
'relation incomplete...',
level=ch_core.hookenv.DEBUG)
continue
links = []
for addrinfo in unit.received['extra_bindings']:
# filter list of networks to those we have interfaces
# configured for
ip = ch_net_ip.get_address_in_network(addrinfo['cidr'])
if ip:
links.append(
{'local': ip,
'remote': addrinfo['address'],
'cidr': addrinfo['cidr']}
)
ch_core.hookenv.log("links: '{}'".format(links))
neighbors.append({
'asn': unit.received['asn'],
'links': links,
'relation_id': relation.relation_id,
'remote_unit_name': unit.unit_name,
})
return neighbors

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provides.py