93 lines
2.8 KiB
Go
93 lines
2.8 KiB
Go
// Copyright 2015 CNI authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ip
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import (
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"errors"
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"fmt"
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"net"
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"strings"
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"github.com/containernetworking/cni/pkg/types"
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"github.com/containernetworking/plugins/pkg/utils"
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)
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// SetupIPMasqForNetwork installs rules to masquerade traffic coming from ip of ipn and
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// going outside of ipn, using a chain name based on network, ifname, and containerID. The
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// backend can be either "iptables" or "nftables"; if it is nil, then a suitable default
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// implementation will be used.
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func SetupIPMasqForNetwork(backend *string, ipn *net.IPNet, network, ifname, containerID string) error {
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if backend == nil {
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// Prefer iptables, unless only nftables is available
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defaultBackend := "iptables"
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if !utils.SupportsIPTables() && utils.SupportsNFTables() {
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defaultBackend = "nftables"
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}
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backend = &defaultBackend
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}
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switch *backend {
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case "iptables":
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return setupIPMasqIPTables(ipn, network, ifname, containerID)
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case "nftables":
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return setupIPMasqNFTables(ipn, network, ifname, containerID)
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default:
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return fmt.Errorf("unknown ipmasq backend %q", *backend)
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}
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}
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// TeardownIPMasqForNetwork undoes the effects of SetupIPMasqForNetwork
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func TeardownIPMasqForNetwork(ipn *net.IPNet, network, ifname, containerID string) error {
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var errs []string
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// Do both the iptables and the nftables cleanup, since the pod may have been
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// created with a different version of this plugin or a different configuration.
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err := teardownIPMasqIPTables(ipn, network, ifname, containerID)
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if err != nil && utils.SupportsIPTables() {
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errs = append(errs, err.Error())
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}
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err = teardownIPMasqNFTables(ipn, network, ifname, containerID)
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if err != nil && utils.SupportsNFTables() {
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errs = append(errs, err.Error())
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}
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if errs == nil {
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return nil
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}
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return errors.New(strings.Join(errs, "\n"))
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}
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// GCIPMasqForNetwork garbage collects stale IPMasq entries for network
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func GCIPMasqForNetwork(network string, attachments []types.GCAttachment) error {
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var errs []string
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err := gcIPMasqIPTables(network, attachments)
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if err != nil && utils.SupportsIPTables() {
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errs = append(errs, err.Error())
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}
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err = gcIPMasqNFTables(network, attachments)
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if err != nil && utils.SupportsNFTables() {
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errs = append(errs, err.Error())
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}
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if errs == nil {
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return nil
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}
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return errors.New(strings.Join(errs, "\n"))
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}
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