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handle_xfrm.go
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/
handle_xfrm.go
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// Copyright 2017 flannel 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.
// +build !windows
package ipsec
import (
"fmt"
"net"
log "github.com/golang/glog"
"github.com/vishvananda/netlink"
"github.com/coreos/flannel/subnet"
)
func AddXFRMPolicy(myLease, remoteLease *subnet.Lease, dir netlink.Dir, reqID int) error {
src := myLease.Subnet.ToIPNet()
dst := remoteLease.Subnet.ToIPNet()
policy := netlink.XfrmPolicy{
Src: src,
Dst: dst,
Dir: dir,
}
tunnelLeft := myLease.Attrs.PublicIP.ToIP()
tunnelRight := remoteLease.Attrs.PublicIP.ToIP()
tmpl := netlink.XfrmPolicyTmpl{
Src: tunnelLeft,
Dst: tunnelRight,
Proto: netlink.XFRM_PROTO_ESP,
Mode: netlink.XFRM_MODE_TUNNEL,
Reqid: reqID,
}
log.Infof("Adding ipsec policy: %+v", tmpl)
policy.Tmpls = append(policy.Tmpls, tmpl)
if err := netlink.XfrmPolicyAdd(&policy); err != nil {
return fmt.Errorf("error adding policy: %+v err: %v", policy, err)
}
return nil
}
func DeleteXFRMPolicy(localSubnet, remoteSubnet *net.IPNet, localPublicIP, remotePublicIP net.IP, dir netlink.Dir, reqID int) error {
src := localSubnet
dst := remoteSubnet
policy := netlink.XfrmPolicy{
Src: src,
Dst: dst,
Dir: dir,
}
tunnelLeft := localPublicIP
tunnelRight := remotePublicIP
tmpl := netlink.XfrmPolicyTmpl{
Src: tunnelLeft,
Dst: tunnelRight,
Proto: netlink.XFRM_PROTO_ESP,
Mode: netlink.XFRM_MODE_TUNNEL,
Reqid: reqID,
}
log.Infof("Deleting ipsec policy: %+v", tmpl)
policy.Tmpls = append(policy.Tmpls, tmpl)
if err := netlink.XfrmPolicyDel(&policy); err != nil {
return fmt.Errorf("error deleting policy: %+v err: %v", policy, err)
}
return nil
}