Network Stack Components

• Over 400,000 lines of code

  • Excludes distributed file systems
  • Excluding device drivers

• Several significant components

  • “mbuf” memory allocator
  • Network device drivers, interface abstraction
  • Protocol-independent routing and event model
  • Link-layer protocols, network-layer protocols
    • Includes IPv4, IPv6, IPSEC, IPX, EtherTalk, ATM
  • Sockets and socket buffers
  • Netgraph extension framework