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cmd/xdpderper,derp/xdp: implement mode that drops STUN packets (#12527)

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This is useful during maintenance as a method for shedding home client
load.

Updates tailscale/corp#20689

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2024-06-18 14:06:00 -07:00
committed by GitHub
parent d55b105dae
commit a93173b56a
9 changed files with 128 additions and 10 deletions
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8
derp/xdp/bpf_bpfel.go
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@@ -12,7 +12,10 @@ import (
"github.com/cilium/ebpf"
)
type bpfConfig struct{ DstPort uint16 }
type bpfConfig struct {
DstPort uint16
DropStun uint16
}
type bpfCounterKeyAf uint32
@@ -46,7 +49,8 @@ const (
bpfCounterKeyProgEndCOUNTER_KEY_END_INVALID_IP_CSUM bpfCounterKeyProgEnd = 3
bpfCounterKeyProgEndCOUNTER_KEY_END_NOT_STUN_PORT bpfCounterKeyProgEnd = 4
bpfCounterKeyProgEndCOUNTER_KEY_END_INVALID_SW_ATTR_VAL bpfCounterKeyProgEnd = 5
bpfCounterKeyProgEndCOUNTER_KEY_END_LEN bpfCounterKeyProgEnd = 6
bpfCounterKeyProgEndCOUNTER_KEY_END_DROP_STUN bpfCounterKeyProgEnd = 6
bpfCounterKeyProgEndCOUNTER_KEY_END_LEN bpfCounterKeyProgEnd = 7
)
type bpfCountersKey struct {