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net/connstats: exclude traffic with internal Tailscale service (#7904)

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Exclude traffic with 100.100.100.100 (for IPv4) and
with fd7a:115c:a1e0::53 (for IPv6) since this traffic with the
Tailscale service running locally on the node.
This traffic never left the node.

It also happens to be a high volume amount of traffic since
DNS requests occur over UDP with each request coming from a
unique port, thus resulting in many discrete traffic flows.

Fixes tailscale/corp#10554

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
This commit is contained in:
Joe Tsai 2023-04-17 14:24:29 -07:00 committed by GitHub
parent 9a655a1d58
commit ff1b35ec6c
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1 changed files with 15 additions and 0 deletions
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15
net/connstats/stats.go
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@ -13,6 +13,7 @@
"golang.org/x/sync/errgroup"
"tailscale.com/net/packet"
"tailscale.com/net/tsaddr"
"tailscale.com/types/netlogtype"
)
@ -92,6 +93,11 @@ func (s *Statistics) UpdateRxVirtual(b []byte) {
s.updateVirtual(b, true)
}
var (
tailscaleServiceIPv4 = tsaddr.TailscaleServiceIP()
tailscaleServiceIPv6 = tsaddr.TailscaleServiceIPv6()
)
func (s *Statistics) updateVirtual(b []byte, receive bool) {
var p packet.Parsed
p.Decode(b)
@ -100,6 +106,15 @@ func (s *Statistics) updateVirtual(b []byte, receive bool) {
conn.Src, conn.Dst = conn.Dst, conn.Src
}
// Network logging is defined as traffic between two Tailscale nodes.
// Traffic with the internal Tailscale service is not with another node
// and should not be logged. It also happens to be a high volume
// amount of discrete traffic flows (e.g., DNS lookups).
switch conn.Dst.Addr() {
case tailscaleServiceIPv4, tailscaleServiceIPv6:
return
}
s.mu.Lock()
defer s.mu.Unlock()
cnts, found := s.virtual[conn]