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sidecar_iptables_linux.go
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sidecar_iptables_linux.go
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// Copyright Istio 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.
// This is a sample chained plugin that supports multiple CNI versions. It
// parses prevResult according to the cniVersion
package plugin
import (
"fmt"
"github.com/containernetworking/plugins/pkg/ns"
"istio.io/istio/pkg/log"
"istio.io/istio/tools/istio-iptables/pkg/cmd"
"istio.io/istio/tools/istio-iptables/pkg/config"
"istio.io/istio/tools/istio-iptables/pkg/dependencies"
)
// getNs is a unit test override variable for interface create.
var getNs = ns.GetNS
// Program defines a method which programs iptables based on the parameters
// provided in Redirect.
func (ipt *iptables) Program(podName, netns string, rdrct *Redirect) error {
cfg := config.DefaultConfig()
cfg.CNIMode = true
cfg.NetworkNamespace = netns
cfg.ProxyPort = rdrct.targetPort
cfg.ProxyUID = rdrct.noRedirectUID
cfg.ProxyGID = rdrct.noRedirectGID
cfg.InboundInterceptionMode = rdrct.redirectMode
cfg.OutboundIPRangesInclude = rdrct.includeIPCidrs
cfg.InboundPortsExclude = rdrct.excludeInboundPorts
cfg.InboundPortsInclude = rdrct.includeInboundPorts
cfg.ExcludeInterfaces = rdrct.excludeInterfaces
cfg.OutboundPortsExclude = rdrct.excludeOutboundPorts
cfg.OutboundPortsInclude = rdrct.includeOutboundPorts
cfg.OutboundIPRangesExclude = rdrct.excludeIPCidrs
cfg.KubeVirtInterfaces = rdrct.kubevirtInterfaces
cfg.DryRun = dependencies.DryRunFilePath.Get() != ""
cfg.RedirectDNS = rdrct.dnsRedirect
cfg.CaptureAllDNS = rdrct.dnsRedirect
cfg.DropInvalid = rdrct.invalidDrop
cfg.DualStack = rdrct.dualStack
if err := cfg.FillConfigFromEnvironment(); err != nil {
return err
}
netNs, err := getNs(netns)
if err != nil {
err = fmt.Errorf("failed to open netns %q: %s", netns, err)
return err
}
defer netNs.Close()
return netNs.Do(func(_ ns.NetNS) error {
log.Infof("============= Start iptables configuration for %v =============", podName)
defer log.Infof("============= End iptables configuration for %v =============", podName)
return cmd.ProgramIptables(cfg)
})
}