117 lines
3.8 KiB
Python
117 lines
3.8 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 config.mac as mac
|
|
|
|
|
|
def get_taps(yaml):
|
|
"""Return a list of all taps."""
|
|
ret = []
|
|
if "taps" in yaml:
|
|
for ifname, iface in yaml["taps"].items():
|
|
ret.append(ifname)
|
|
return ret
|
|
|
|
|
|
def get_by_name(yaml, ifname):
|
|
"""Return the tap by name, if it exists. Return None otherwise."""
|
|
try:
|
|
if ifname in yaml["taps"]:
|
|
return ifname, yaml["taps"][ifname]
|
|
except:
|
|
pass
|
|
return None, None
|
|
|
|
|
|
def is_tap(yaml, ifname):
|
|
"""Returns True if the interface name is an existing tap in the config.
|
|
The TAP has to be explicitly named in the configuration, and notably
|
|
a TAP belonging to a Linux Control Plane (LCP) will return False.
|
|
"""
|
|
ifname, iface = get_by_name(yaml, ifname)
|
|
return not iface == None
|
|
|
|
|
|
def is_host_name_unique(yaml, hostname):
|
|
"""Returns True if there is at most one occurence of the given ifname amonst all host-names of TAPs."""
|
|
if not "taps" in yaml:
|
|
return True
|
|
host_names = []
|
|
for tap_ifname, tap_iface in yaml["taps"].items():
|
|
host_names.append(tap_iface["host"]["name"])
|
|
return host_names.count(hostname) < 2
|
|
|
|
|
|
def validate_taps(yaml):
|
|
result = True
|
|
msgs = []
|
|
logger = logging.getLogger("vppcfg.config")
|
|
logger.addHandler(logging.NullHandler())
|
|
|
|
if not "taps" in yaml:
|
|
return result, msgs
|
|
|
|
for ifname, iface in yaml["taps"].items():
|
|
logger.debug(f"tap {iface}")
|
|
instance = int(ifname[3:])
|
|
|
|
## NOTE(pim): 1024 is not off-by-one, tap1024 is precisely the highest permissible id
|
|
if instance > 1024:
|
|
msgs.append(f"tap {ifname} has instance {int(instance)} which is too large")
|
|
result = False
|
|
|
|
if not is_host_name_unique(yaml, iface["host"]["name"]):
|
|
msgs.append(
|
|
f"tap {ifname} does not have a unique host name {iface['host']['name']}"
|
|
)
|
|
result = False
|
|
|
|
if "rx-ring-size" in iface:
|
|
n = iface["rx-ring-size"]
|
|
if n & (n - 1) != 0:
|
|
msgs.append(f"tap {ifname} rx-ring-size must be a power of two")
|
|
result = False
|
|
|
|
if "tx-ring-size" in iface:
|
|
n = iface["tx-ring-size"]
|
|
if n & (n - 1) != 0:
|
|
msgs.append(f"tap {ifname} tx-ring-size must be a power of two")
|
|
result = False
|
|
|
|
if (
|
|
"namespace-create" in iface["host"]
|
|
and iface["host"]["namespace-create"]
|
|
and not "namespace" in iface["host"]
|
|
):
|
|
msgs.append(
|
|
f"tap {ifname} namespace-create can only be set if namespace is set"
|
|
)
|
|
result = False
|
|
|
|
if (
|
|
"bridge-create" in iface["host"]
|
|
and iface["host"]["bridge-create"]
|
|
and not "bridge" in iface["host"]
|
|
):
|
|
msgs.append(f"tap {ifname} bridge-create can only be set if bridge is set")
|
|
result = False
|
|
|
|
if "mac" in iface["host"] and mac.is_multicast(iface["host"]["mac"]):
|
|
msgs.append(
|
|
f"tap {ifname} host MAC address {iface['host']['mac']} cannot be multicast"
|
|
)
|
|
result = False
|
|
|
|
return result, msgs
|