mirror of
https://github.com/rancher/plugins.git
synced 2025-07-09 13:15:20 +00:00
47 lines
1.8 KiB
Go
47 lines
1.8 KiB
Go
// Copyright 2023 CNI authors
|
|
//
|
|
// 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.
|
|
|
|
package utils
|
|
|
|
import (
|
|
"github.com/coreos/go-iptables/iptables"
|
|
"sigs.k8s.io/knftables"
|
|
)
|
|
|
|
// SupportsIPTables tests whether the system supports using netfilter via the iptables API
|
|
// (whether via "iptables-legacy" or "iptables-nft"). (Note that this returns true if it
|
|
// is *possible* to use iptables; it does not test whether any other components on the
|
|
// system are *actually* using iptables.)
|
|
func SupportsIPTables() bool {
|
|
ipt, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
// We don't care whether the chain actually exists, only whether we can *check*
|
|
// whether it exists.
|
|
_, err = ipt.ChainExists("filter", "INPUT")
|
|
return err == nil
|
|
}
|
|
|
|
// SupportsNFTables tests whether the system supports using netfilter via the nftables API
|
|
// (ie, not via "iptables-nft"). (Note that this returns true if it is *possible* to use
|
|
// nftables; it does not test whether any other components on the system are *actually*
|
|
// using nftables.)
|
|
func SupportsNFTables() bool {
|
|
// knftables.New() does sanity checks so we don't need any further test like in
|
|
// the iptables case.
|
|
_, err := knftables.New(knftables.IPv4Family, "supports_nftables_test")
|
|
return err == nil
|
|
}
|