[draft] calicovppctl: add HTTP capture server for BPF filtering with binary API support#862
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[draft] calicovppctl: add HTTP capture server for BPF filtering with binary API support#862
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January 8, 2026 13:42
- Add CLI flags: -srcip, -dstip, -srcport, -dstport, -protocol - Implement BPF filter building and application using VPP CLI - Handle empty capture files gracefully - Support BPF filtering for trace, pcap, and dispatch commands Signed-off-by: Aritra Basu <aritrbas@cisco.com>
- Serialize capture operations (trace/pcap/dispatch) per VPP pod using an in-pod lock file (/tmp/calicovppctl.lock), preventing parallel captures from multiple clients - Provide clear error output when a capture is already running - Add forced cleanup option: `calicovppctl capture clear -node <node>` - clears trace - stops `pcap trace` and `pcap dispatch trace` - clears BPF filters and restores default filter functions - removes hanging in-pod lock file Signed-off-by: Aritra Basu <aritrbas@cisco.com>
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Capture Server (calico-vpp-agent/capture/capture_server.go): - HTTP server running on port 9999 (configurable via CaptureServerPort) - Endpoints: /api/status, /api/trace, /api/pcap, /api/dispatch, /api/stop - Handles timeouts and user conflicts via mutex-based single-instance execution - Handles client disconnect to cleanup captures - Uses vpplink binary API for stability instead of vppctl CLI vpplink API additions: - vpplink/bpf.go: BPF filter management via binary API - vpplink/tracedump.go: trace capture and dump via binary API - Generated bindings for bpf_trace_filter and tracedump calicovppctl updates: - Added --use-api flag to use the capture server instead of vppctl commands via kubectl exec for trace, pcap and dispatch - Added 'capture status' subcommand to check capture status - Added 'capture stop' subcommand to stop running captures config updates: - Added CaptureServerPort configuration option (default: 9999)
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Capture Server (calico-vpp-agent/capture/capture_server.go):
vpplink API additions:
calicovppctl updates:
config updates: