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Add more metrics (#450)

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* Add more metrics

This change adds the following counter metrics:

Metrics to track packets dropped at the firewall:

    firewall.dropped.local_ip
    firewall.dropped.remote_ip
    firewall.dropped.no_rule

Metrics to track handshakes attempts that have been initiated and ones
that have timed out (ones that have completed are tracked by the
existing "handshakes" histogram).

    handshake_manager.initiated
    handshake_manager.timed_out

Metrics to track when cached_packets are dropped because we run out of
buffer space, and how many are sent once the handshake completes.

    hostinfo.cached_packets.dropped
    hostinfo.cached_packets.sent

This change also notes how many cached packets we have when we log the
final "Handshake received" message for either stage1 for stage2.

* separate incoming/outgoing metrics

* remove "allowed" firewall metrics

We don't need this on the hotpath, they aren't worh it.

* don't need pointers here
This commit is contained in:
Wade Simmons
2021-04-27 22:23:18 -04:00
committed by GitHub
parent db23fdf9bc
commit 44cb697552
6 changed files with 69 additions and 15 deletions
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6
handshake_ix.go
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@ -268,10 +268,11 @@ func ixHandshakeStage1(f *Interface, addr *udpAddr, packet []byte, h *Header) {
WithField("fingerprint", fingerprint).
WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).
WithField("sentCachedPackets", len(hostinfo.packetStore)).
Info("Handshake message sent")
}
hostinfo.handshakeComplete(f.l)
hostinfo.handshakeComplete(f.l, f.cachedPacketMetrics)
return
}
@ -391,6 +392,7 @@ func ixHandshakeStage2(f *Interface, addr *udpAddr, hostinfo *HostInfo, packet [
WithField("initiatorIndex", hs.Details.InitiatorIndex).WithField("responderIndex", hs.Details.ResponderIndex).
WithField("remoteIndex", h.RemoteIndex).WithField("handshake", m{"stage": 2, "style": "ix_psk0"}).
WithField("durationNs", duration).
WithField("sentCachedPackets", len(hostinfo.packetStore)).
Info("Handshake message received")
hostinfo.remoteIndexId = hs.Details.ResponderIndex
@ -410,7 +412,7 @@ func ixHandshakeStage2(f *Interface, addr *udpAddr, hostinfo *HostInfo, packet [
// Complete our handshake and update metrics, this will replace any existing tunnels for this vpnIp
//TODO: Complete here does not do a race avoidance, it will just take the new tunnel. Is this ok?
f.handshakeManager.Complete(hostinfo, f)
hostinfo.handshakeComplete(f.l)
hostinfo.handshakeComplete(f.l, f.cachedPacketMetrics)
f.metricHandshakes.Update(duration)
return false