bb57ed8e52
Returns True if there is at most one occurence of the ip_interface (an IPv4/IPv6 prefix+len) in the entire config. That said, we need the 'iface_addresses' because VPP is a bit fickle in this regard. IP addresses from the same prefix/len can be added to a given interface (ie 192.0.2.1/24 and 192.0.2.2/24), but other than that, any prefix can not occur as a more-specific or less-specific of any other interface. So, we will allow: - any ip_interface that is of equal network/len of existing one(s) _on the same interface_ And, we will reject - any ip_interface that is a more specific of any existing one - any ip_interface that is a less specific of any existing one Update unit tests to ensure ip_interfaces are allowed in all cases.
123 lines
4.9 KiB
Python
123 lines
4.9 KiB
Python
#
|
|
# Copyright (c) 2022 Pim van Pelt
|
|
#
|
|
# 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 logging
|
|
import validator.interface as interface
|
|
import ipaddress
|
|
|
|
def get_all_addresses_except_ifname(yaml, except_ifname):
|
|
""" Return a list of all ipaddress.ip_interface() instances in the entire config,
|
|
except for those that belong to 'ifname'.
|
|
"""
|
|
ret = []
|
|
if 'interfaces' in yaml:
|
|
for ifname, iface in yaml['interfaces'].items():
|
|
if ifname == except_ifname:
|
|
continue
|
|
|
|
if 'addresses' in iface:
|
|
for a in iface['addresses']:
|
|
ret.append(ipaddress.ip_interface(a))
|
|
if 'sub-interfaces' in iface:
|
|
for subid, sub_iface in iface['sub-interfaces'].items():
|
|
sub_ifname = "%s.%d" % (ifname, subid)
|
|
if sub_ifname == except_ifname:
|
|
continue
|
|
|
|
if 'addresses' in sub_iface:
|
|
for a in sub_iface['addresses']:
|
|
ret.append(ipaddress.ip_interface(a))
|
|
if 'loopbacks' in yaml:
|
|
for ifname, iface in yaml['loopbacks'].items():
|
|
if ifname == except_ifname:
|
|
continue
|
|
|
|
if 'addresses' in iface:
|
|
for a in iface['addresses']:
|
|
ret.append(ipaddress.ip_interface(a))
|
|
if 'bridgedomains' in yaml:
|
|
for ifname, iface in yaml['bridgedomains'].items():
|
|
if ifname == except_ifname:
|
|
continue
|
|
|
|
if 'addresses' in iface:
|
|
for a in iface['addresses']:
|
|
ret.append(ipaddress.ip_interface(a))
|
|
|
|
return ret
|
|
|
|
def is_allowed(yaml, ifname, iface_addresses, ip_interface):
|
|
""" Returns True if there is at most one occurence of the ip_interface (an IPv4/IPv6 prefix+len)
|
|
in the entire config. That said, we need the 'iface_addresses' because VPP is a bit fickle in
|
|
this regard.
|
|
|
|
IP addresses from the same prefix/len can be added to a given interface (ie 192.0.2.1/24 and
|
|
192.0.2.2/24), but other than that, any prefix can not occur as a more-specific or less-specific
|
|
of any other interface.
|
|
|
|
So, we will allow:
|
|
- any ip_interface that is of equal network/len of existing one(s) _on the same interface_
|
|
|
|
And, we will reject
|
|
- any ip_interface that is a more specific of any existing one
|
|
- any ip_interface that is a less specific of any existing one
|
|
|
|
Examples:
|
|
vpp# set interface ip address loop0 192.0.2.1/24
|
|
vpp# set interface ip address loop0 192.0.2.2/24
|
|
vpp# set interface ip address loop0 192.0.2.1/29
|
|
set interface ip address: failed to add 192.0.2.1/29 on loop0 which conflicts with 192.0.2.1/24 for interface loop0
|
|
vpp# set interface ip address loop0 192.0.2.3/23
|
|
set interface ip address: failed to add 192.0.2.3/23 on loop0 which conflicts with 192.0.2.1/24 for interface loop0
|
|
"""
|
|
## print("input: (%s,%s)" % (iface_addresses, ip_interface))
|
|
all_other_addresses = get_all_addresses_except_ifname(yaml, ifname)
|
|
## print("All IPs: %s" % all_other_addresses)
|
|
|
|
my_ip_network = ipaddress.ip_network(ip_interface, strict=False)
|
|
|
|
for ipi in all_other_addresses:
|
|
if ipi.version != my_ip_network.version:
|
|
continue
|
|
|
|
if ipaddress.ip_network(ipi, strict=False) == my_ip_network:
|
|
## print("Same: %s == %s" % (ip_interface, ipi))
|
|
return False
|
|
|
|
if ipaddress.ip_network(ipi, strict=False).subnet_of(my_ip_network):
|
|
## print("More: %s == %s" % (ip_interface, ipi))
|
|
return False
|
|
|
|
if my_ip_network.subnet_of(ipaddress.ip_network(ipi, strict=False)):
|
|
## print("Less: %s == %s" % (ip_interface, ipi))
|
|
return False
|
|
|
|
for ip in iface_addresses:
|
|
ipi = ipaddress.ip_interface(ip)
|
|
if ipi.version != my_ip_network.version:
|
|
continue
|
|
|
|
if ipaddress.ip_network(ipi, strict=False) == my_ip_network:
|
|
## print("iface same: %s == %s" % (ip_interface, ipi))
|
|
return True
|
|
|
|
if ipaddress.ip_network(ipi, strict=False).subnet_of(my_ip_network):
|
|
## print("iface more: %s == %s" % (ip_interface, ipi))
|
|
return False
|
|
|
|
if my_ip_network.subnet_of(ipaddress.ip_network(ipi, strict=False)):
|
|
## print("iface less: %s == %s" % (ip_interface, ipi))
|
|
return False
|
|
|
|
return True
|