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iptablesplugin.go
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/
iptablesplugin.go
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// Copyright (c) 2019 Cisco and/or its affiliates.
//
// 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.
//go:generate descriptor-adapter --descriptor-name RuleChain --value-type *linux_iptables.RuleChain --import "github.com/ligato/vpp-agent/api/models/linux/iptables" --output-dir "descriptor"
package iptablesplugin
import (
"github.com/ligato/cn-infra/infra"
kvs "github.com/ligato/vpp-agent/plugins/kvscheduler/api"
"github.com/ligato/vpp-agent/plugins/linux/iptablesplugin/descriptor"
"github.com/ligato/vpp-agent/plugins/linux/iptablesplugin/linuxcalls"
"github.com/ligato/vpp-agent/plugins/linux/nsplugin"
)
const (
// by default, at most 10 go routines will split the configured rule chains
// to execute the Retrieve operation in parallel.
defaultGoRoutinesCnt = 10
)
// IPTablesPlugin configures Linux iptables rules.
type IPTablesPlugin struct {
Deps
// From configuration file
disabled bool
configFound bool
// system handlers
iptHandler linuxcalls.IPTablesAPI
// descriptors
ruleChainDescriptor *descriptor.RuleChainDescriptor
}
// Deps lists dependencies of the plugin.
type Deps struct {
infra.PluginDeps
KVScheduler kvs.KVScheduler
NsPlugin nsplugin.API
}
// Config holds the plugin configuration.
type Config struct {
Disabled bool `json:"disabled"`
GoRoutinesCnt int `json:"go-routines-count"`
}
// Init initializes and registers descriptors and handlers for Linux iptables rules.
func (p *IPTablesPlugin) Init() error {
// parse configuration file
config, err := p.retrieveConfig()
if err != nil {
return err
}
p.Log.Debugf("Linux iptables config: %+v", config)
if config.Disabled {
p.disabled = true
p.Log.Infof("Disabling iptables plugin")
return nil
}
// init iptables handler
p.iptHandler = linuxcalls.NewIPTablesHandler()
err = p.iptHandler.Init()
if err != nil && p.configFound {
// just warn here, iptables / ip6tables just may not be installed - will return
// an error by attempt to configure it
p.Log.Warnf("Error by initializing iptables handler: %v", err)
}
// init & register the descriptor
ruleChainDescriptor := descriptor.NewRuleChainDescriptor(
p.KVScheduler, p.iptHandler, p.NsPlugin, p.Log, config.GoRoutinesCnt)
err = p.Deps.KVScheduler.RegisterKVDescriptor(ruleChainDescriptor)
if err != nil {
return err
}
return nil
}
// Close does nothing here.
func (p *IPTablesPlugin) Close() error {
return nil
}
// retrieveConfig loads plugin configuration file.
func (p *IPTablesPlugin) retrieveConfig() (*Config, error) {
config := &Config{
// default configuration
GoRoutinesCnt: defaultGoRoutinesCnt,
}
found, err := p.Cfg.LoadValue(config)
if !found {
p.Log.Debug("Linux IPTablesPlugin config not found")
return config, nil
}
if err != nil {
return nil, err
}
p.configFound = true
return config, err
}