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interface.go
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interface.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 main
import (
"fmt"
"net"
"github.com/cilium/cilium/api/v1/models"
linuxrouting "github.com/cilium/cilium/pkg/datapath/linux/routing"
"github.com/cilium/cilium/pkg/ip"
"github.com/containernetworking/cni/pkg/types/current"
)
func interfaceAdd(ipConfig *current.IPConfig, ipam *models.IPAMAddressResponse, conf models.DaemonConfigurationStatus) error {
// If the gateway IP is not available, it is already set up
if ipam.Gateway == "" {
return nil
}
var masq bool
if ipConfig.Version == "4" {
masq = conf.MasqueradeProtocols.IPV4
} else if ipConfig.Version == "6" {
masq = conf.MasqueradeProtocols.IPV6
} else {
return fmt.Errorf("Invalid IPConfig version: %s", ipConfig.Version)
}
allCIDRs := make([]*net.IPNet, 0, len(ipam.Cidrs))
for _, cidrString := range ipam.Cidrs {
_, cidr, err := net.ParseCIDR(cidrString)
if err != nil {
return fmt.Errorf("invalid CIDR '%s': %s", cidrString, err)
}
allCIDRs = append(allCIDRs, cidr)
}
// Coalesce CIDRs into minimum set needed for route rules
// The routes set up here will be cleaned up by linuxrouting.Delete.
// Therefore the code here should be kept in sync with the deletion code.
ipv4CIDRs, _ := ip.CoalesceCIDRs(allCIDRs)
cidrs := make([]string, 0, len(ipv4CIDRs))
for _, cidr := range ipv4CIDRs {
cidrs = append(cidrs, cidr.String())
}
routingInfo, err := linuxrouting.NewRoutingInfo(
ipam.Gateway,
cidrs,
ipam.MasterMac,
ipam.InterfaceNumber,
masq,
)
if err != nil {
return fmt.Errorf("unable to parse routing info: %v", err)
}
if err := routingInfo.Configure(
ipConfig.Address.IP,
int(conf.DeviceMTU),
conf.EgressMultiHomeIPRuleCompat,
); err != nil {
return fmt.Errorf("unable to install ip rules and routes: %s", err)
}
return nil
}