Fixes:
- Add TX/RX timeouts for control messages. This helps to mitigate potential DoS (Denial of Service) attacks on the control port.
Features:
- Optional seccomp support has been added to the firewall daemon
letmeinfwd. - Optional seccomp support has been added to the client application
letmein. - letmeind: Now prints the peer's IP address to the system log on unexpected protocol handling failures.