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pkg/tcpip/transport/tcp: add statistics for dropped connections

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When the TCP forwarder ignores a connection due to having too many
in-flight connections, it's not easy to log a message or update a metric
for later debugging. Add a metric that will be incremented in this case
so that the user of the Forwarder can observe this.

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
This commit is contained in:
Andrew Dunham
2023-07-17 15:07:55 -04:00
parent e672476d06
commit 057e0b7eae
5 changed files with 40 additions and 0 deletions
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pkg/sentry/socket/netstack/netstack.go
+1
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@@ -287,6 +287,7 @@ var Metrics = tcpip.Stats{
SegmentsAckedWithDSACK: mustCreateMetric("/netstack/tcp/segments_acked_with_dsack", "Number of segments for which DSACK was received."),
SpuriousRecovery: mustCreateMetric("/netstack/tcp/spurious_recovery", "Number of times the connection entered loss recovery spuriously."),
SpuriousRTORecovery: mustCreateMetric("/netstack/tcp/spurious_rto_recovery", "Number of times the connection entered RTO spuriously."),
ForwardMaxInFlightDrop: mustCreateMetric("/netstack/tcp/forward_max_in_flight_drop", "Number of connection requests dropped due to exceeding in-flight limit."),
},
UDP: tcpip.UDPStats{
PacketsReceived: mustCreateMetric("/netstack/udp/packets_received", "Number of UDP datagrams received via HandlePacket."),