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net/tstun, wgengine: add packet-level and drop metrics

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Primarily tstun work, but some MagicDNS stuff spread into wgengine.

No wireguard reconfig metrics (yet).

Updates #3307

Change-Id: Ide768848d7b7d0591e558f118b553013d1ec94ad
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-11-16 16:01:42 -08:00
committed by Brad Fitzpatrick
parent ec036b3561
commit cf06f9df37
2 changed files with 31 additions and 0 deletions
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8
wgengine/userspace.go
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@@ -42,6 +42,7 @@ import (
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/types/netmap"
"tailscale.com/util/clientmetric"
"tailscale.com/util/deephash"
"tailscale.com/version"
"tailscale.com/wgengine/filter"
@@ -435,6 +436,7 @@ func echoRespondToAll(p *packet.Parsed, t *tstun.Wrapper) filter.Response {
// main ACL filter.
func (e *userspaceEngine) handleLocalPackets(p *packet.Parsed, t *tstun.Wrapper) filter.Response {
if verdict := e.handleDNS(p, t); verdict == filter.Drop {
metricMagicDNSPacketIn.Add(1)
// local DNS handled the packet.
return filter.Drop
}
@@ -450,6 +452,7 @@ func (e *userspaceEngine) handleLocalPackets(p *packet.Parsed, t *tstun.Wrapper)
// notice that an outbound packet is actually destined for
// ourselves, and loop it back into macOS.
t.InjectInboundCopy(p.Buffer())
metricReflectToOS.Add(1)
return filter.Drop
}
}
@@ -1554,3 +1557,8 @@ func (ls fwdDNSLinkSelector) PickLink(ip netaddr.IP) (linkName string) {
}
return ""
}
var (
metricMagicDNSPacketIn = clientmetric.NewGauge("magicdns_packet_in") // for 100.100.100.100
metricReflectToOS = clientmetric.NewGauge("packet_reflect_to_os")
)