Change Details

- Serialize updates to so_fibnum with the socket lock. - Make sure we can't change the FIB of a listening socket.

- Serialize updates to so_fibnum with the socket lock. - Make sure we can't change the FIB of a listening socket. My goal here is to permit FIB-local listening sockets, wherein multiple listening sockets listen on a port (using SO_REUSEPORT), but each listening socket only accepts connections that come from its FIB.

- Serialize updates to so_fibnum with the socket lock. - Make sure we can't change the FIB of a listening socket. My goal here is to permit FIB-local listening sockets, wherein multiple listening sockets listen on a port (using SO_REUSEPORT), but each listening socket only accepts connections that come from its FIB.