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loader.go
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loader.go
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// Copyright 2019 Authors of Cilium
//
// 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 datapath
import (
"context"
"io"
"net"
"github.com/cilium/cilium/pkg/datapath/loader/metrics"
"github.com/cilium/cilium/pkg/lock"
)
// Loader is an interface to abstract out loading of datapath programs.
type Loader interface {
CallsMapPath(id uint16) string
CompileAndLoad(ctx context.Context, ep Endpoint, stats *metrics.SpanStat) error
CompileOrLoad(ctx context.Context, ep Endpoint, stats *metrics.SpanStat) error
ReloadDatapath(ctx context.Context, ep Endpoint, stats *metrics.SpanStat) error
EndpointHash(cfg EndpointConfiguration) (string, error)
Unload(ep Endpoint)
Reinitialize(ctx context.Context, o BaseProgramOwner, deviceMTU int, iptMgr IptablesManager, p Proxy, r RouteReserver) error
}
// BaseProgramOwner is any type for which a loader is building base programs.
type BaseProgramOwner interface {
DeviceConfiguration
GetCompilationLock() *lock.RWMutex
Datapath() Datapath
LocalConfig() *LocalNodeConfiguration
SetPrefilter(pf PreFilter)
}
// PreFilter an interface for an XDP pre-filter.
type PreFilter interface {
WriteConfig(fw io.Writer)
Dump(to []string) ([]string, int64)
Insert(revision int64, cidrs []net.IPNet) error
Delete(revision int64, cidrs []net.IPNet) error
}
// RouteReserver is any type which is responsible for installing local routes.
type RouteReserver interface {
ReserveLocalRoutes()
}
// Proxy is any type which installs rules related to redirecting traffic to
// a proxy.
type Proxy interface {
ReinstallRules()
}
// IptablesManager manages iptables rules.
type IptablesManager interface {
// InstallProxyRules creates the necessary datapath config (e.g., iptables
// rules for redirecting host proxy traffic on a specific ProxyPort)
InstallProxyRules(proxyPort uint16, ingress bool, name string) error
// SupportsOriginalSourceAddr tells if the datapath supports
// use of original source addresses in proxy upstream
// connections.
SupportsOriginalSourceAddr() bool
InstallRules(ifName string, quiet, install bool) error
// GetProxyPort fetches the existing proxy port configured for the
// specified listener. Used early in bootstrap to reopen proxy ports.
GetProxyPort(listener string) uint16
}