* Unify peer and route ACL filtering with multi-source peer rules
* Remove partial userspace firewall mode and open foreign chains via a table-less allower
* Snapshot iptables rule maps before persisting state
* Scope userspace firewall wildcard source rules per address family
* Install nftables peer filter and mangle rules in a single transaction
* Share the iptables jump rule spec between install and cleanup
* Fix legacy ACL source wildcard and keep rollback tracking on delete failure
* Fix CI: recognize multi-value port set lookups in tests and correct PeerIP lint suppression
* Fall back to per-prefix filter rules when ipset is unavailable
* Annotate legacy PeerIP usages in ACL tests and fix import formatting
* Keep firewall rule bookkeeping in step with the kernel on replace and teardown
* Release the routing reference when the route manager shuts down
* Keep set references and rule tracking consistent when a routing rule fails
- Move `util/grpc` and `util/net` to `client` so `internal` packages can be accessed
- Add methods to return the next best interface after the NetBird interface.
- Use `IP_UNICAST_IF` sock opt to force the outgoing interface for the NetBird `net.Dialer` and `net.ListenerConfig` to avoid routing loops. The interface is picked by the new route lookup method.
- Some refactoring to avoid import cycles
- Old behavior is available through `NB_USE_LEGACY_ROUTING=true` env var
adds NetFlow functionality to track and log network traffic information between peers, with features including:
- Flow logging for TCP, UDP, and ICMP traffic
- Integration with connection tracking system
- Resource ID tracking in NetFlow events
- DNS and exit node collection configuration
- Flow API and Redis cache in management
- Memory-based flow storage implementation
- Kernel conntrack counters and userspace counters
- TCP state machine improvements for more accurate tracking
- Migration from net.IP to netip.Addr in the userspace firewall
- Add stateful firewall functionality for UDP/TCP/ICMP in userspace firewalll
- Removes all egress drop rules/filters, still needs refactoring so we don't add output rules to any chains/filters.
- on Linux, if the OUTPUT policy is DROP then we don't do anything about it (no extra allow rules). This is up to the user, if they don't want anything leaving their machine they'll have to manage these rules explicitly.
- Update nftables library to v0.2.0
- Mark traffic that was originally destined for local and applies the input rules in the forward chain if said traffic was redirected (e.g. by Docker)
- Add nft rules to internal map only if flush was successful
- Improve error message if handle is 0 (= not found or hasn't been refreshed)
- Add debug logging when route rules are added
- Replace nftables userdata (rule ID) with a rule hash
Viktor Liu