README
======

Directory Structure
===================

  nuttx/
   |
   `- net/
       |
       +- arp       - Address resolution protocol (IPv4)
       +- devif     - Stack/device interface layer
       +- icmp      - Internet Control Message Protocol (IPv4)
       +- icmpv6    - Internet Control Message Protocol (IPv6)
       +- ipforward - IP forwarding logic
       +- local     - Unix domain (local) sockets
       +- loopback  - Local loopback
       +- neighbor  - Neighbor Discovery Protocol (IPv6)
       +- netdev    - Socket network device interface
       +- pkt       - "Raw" packet socket support
       +- socket    - BSD socket interface
       +- route     - Routing table support
       +- tcp       - Transmission Control Protocol
       +- udp       - User Datagram Protocol
       +- usrsock   - User socket API for user-space networking stack
       `- utils     - Miscellaneous utility functions


    +-------------------------------------------------------------------++------------------------+
    |                     Application layer                             || usrsock daemon         |
    +-------------------------------------------------------------------++------------------------+
    +-------------------------------------------------------------------++----------------+ +-----+
    |                   Socket layer (socket/)                          || /dev/usrsock   | |     |
    +-------------------------------------------------------------------++----------------+ |     |
    +------------++--------------------------------------------------++-------------------+ |     |
    |  Network   || Protocol stacks (arp, ipv6, icmp, pkt, tcp, udp) || usrsock/          | |     |
    |   Device   |+--------------------------------------------------++-------------------+ |     |
    | Interface  |+------------------------------------++---------------------------------+ |     |
    | (netdev/)  ||  Network Device Interface (devif/) || Utilities                       | |     |
    +------------++------------------------------------++---------------------------------+ |     |
    +----------------------------------------------------------------+                      |     |
    |                    Network Device Drivers                      |                      | HAL |
    +----------------------------------------------------------------+                      +-----+
    +----------------------------------------------------------------+ +--------------------------+
    |                    Networking Hardware                         | |  Hardware TCP/IP Stack   |
    +----------------------------------------------------------------+ +--------------------------+