102 lines
1.8 KiB
Go
102 lines
1.8 KiB
Go
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package netlink
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import (
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"fmt"
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"github.com/vishvananda/netlink/nl"
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"github.com/vishvananda/netns"
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"golang.org/x/sys/unix"
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)
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type XfrmMsg interface {
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Type() nl.XfrmMsgType
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}
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type XfrmMsgExpire struct {
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XfrmState *XfrmState
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Hard bool
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}
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func (ue *XfrmMsgExpire) Type() nl.XfrmMsgType {
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return nl.XFRM_MSG_EXPIRE
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}
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func parseXfrmMsgExpire(b []byte) *XfrmMsgExpire {
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var e XfrmMsgExpire
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msg := nl.DeserializeXfrmUserExpire(b)
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e.XfrmState = xfrmStateFromXfrmUsersaInfo(&msg.XfrmUsersaInfo)
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e.Hard = msg.Hard == 1
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return &e
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}
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func XfrmMonitor(ch chan<- XfrmMsg, done <-chan struct{}, errorChan chan<- error,
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types ...nl.XfrmMsgType) error {
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groups, err := xfrmMcastGroups(types)
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if err != nil {
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return nil
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}
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s, err := nl.SubscribeAt(netns.None(), netns.None(), unix.NETLINK_XFRM, groups...)
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if err != nil {
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return err
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}
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if done != nil {
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go func() {
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<-done
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s.Close()
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}()
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}
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go func() {
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defer close(ch)
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for {
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msgs, from, err := s.Receive()
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if err != nil {
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errorChan <- err
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return
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}
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if from.Pid != nl.PidKernel {
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errorChan <- fmt.Errorf("Wrong sender portid %d, expected %d", from.Pid, nl.PidKernel)
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return
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}
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for _, m := range msgs {
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switch m.Header.Type {
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case nl.XFRM_MSG_EXPIRE:
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ch <- parseXfrmMsgExpire(m.Data)
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default:
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errorChan <- fmt.Errorf("unsupported msg type: %x", m.Header.Type)
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}
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}
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}
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}()
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return nil
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}
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func xfrmMcastGroups(types []nl.XfrmMsgType) ([]uint, error) {
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groups := make([]uint, 0)
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if len(types) == 0 {
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return nil, fmt.Errorf("no xfrm msg type specified")
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}
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for _, t := range types {
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var group uint
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switch t {
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case nl.XFRM_MSG_EXPIRE:
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group = nl.XFRMNLGRP_EXPIRE
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default:
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return nil, fmt.Errorf("unsupported group: %x", t)
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}
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groups = append(groups, group)
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}
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return groups, nil
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}
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