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Fix a data race on message counter (#284) 

3. ==================
WARNING: DATA RACE
Write at 0x00c00030e020 by goroutine 17:
  sync/atomic.AddInt64()
      runtime/race_amd64.s:276 +0xb
  github.com/slackhq/nebula.(*Interface).sendNoMetrics()
      github.com/slackhq/nebula/inside.go:226 +0x9c
  github.com/slackhq/nebula.(*Interface).send()
      github.com/slackhq/nebula/inside.go:214 +0x149
  github.com/slackhq/nebula.(*Interface).readOutsidePackets()
      github.com/slackhq/nebula/outside.go:94 +0x1213
  github.com/slackhq/nebula.(*udpConn).ListenOut()
      github.com/slackhq/nebula/udp_generic.go:109 +0x3b5
  github.com/slackhq/nebula.(*Interface).listenOut()
      github.com/slackhq/nebula/interface.go:147 +0x15e

Previous read at 0x00c00030e020 by goroutine 18:
  github.com/slackhq/nebula.(*Interface).consumeInsidePacket()
      github.com/slackhq/nebula/inside.go:58 +0x892
  github.com/slackhq/nebula.(*Interface).listenIn()
      github.com/slackhq/nebula/interface.go:164 +0x178
This commit is contained in:
Darren Hoo 2020-09-22 09:41:46 +08:00 committed by GitHub
parent 68e3e84fdc
commit 0010db46e4
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 5 deletions
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11
inside.go
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@ -54,8 +54,8 @@ func (f *Interface) consumeInsidePacket(packet []byte, fwPacket *FirewallPacket,
dropReason := f.firewall.Drop(packet, *fwPacket, false, hostinfo, trustedCAs)
if dropReason == nil {
f.sendNoMetrics(message, 0, ci, hostinfo, hostinfo.remote, packet, nb, out)
if f.lightHouse != nil && *ci.messageCounter%5000 == 0 {
mc := f.sendNoMetrics(message, 0, ci, hostinfo, hostinfo.remote, packet, nb, out)
if f.lightHouse != nil && mc%5000 == 0 {
f.lightHouse.Query(fwPacket.RemoteIP, f)
}
@ -214,10 +214,10 @@ func (f *Interface) send(t NebulaMessageType, st NebulaMessageSubType, ci *Conne
f.sendNoMetrics(t, st, ci, hostinfo, remote, p, nb, out)
}
func (f *Interface) sendNoMetrics(t NebulaMessageType, st NebulaMessageSubType, ci *ConnectionState, hostinfo *HostInfo, remote *udpAddr, p, nb, out []byte) {
func (f *Interface) sendNoMetrics(t NebulaMessageType, st NebulaMessageSubType, ci *ConnectionState, hostinfo *HostInfo, remote *udpAddr, p, nb, out []byte) uint64 {
if ci.eKey == nil {
//TODO: log warning
return
return 0
}
var err error
@ -237,7 +237,7 @@ func (f *Interface) sendNoMetrics(t NebulaMessageType, st NebulaMessageSubType,
WithField("udpAddr", remote).WithField("counter", c).
WithField("attemptedCounter", ci.messageCounter).
Error("Failed to encrypt outgoing packet")
return
return c
}
err = f.outside.WriteTo(out, remote)
@ -245,6 +245,7 @@ func (f *Interface) sendNoMetrics(t NebulaMessageType, st NebulaMessageSubType,
hostinfo.logger().WithError(err).
WithField("udpAddr", remote).Error("Failed to write outgoing packet")
}
return c
}
func isMulticast(ip uint32) bool {