Network Support

• 6LoWPAN
• SocketCAN Device Drivers
• “Raw” packet socket support
• IP Packet Filter
• Network Address Translation (NAT)
• Network Devices
• Network Drivers
• CONFIG_NET_GUARDSIZE
• Netlink Route support
• SLIP
• Work Queue Deadlocks

net Directory Structure

nuttx/
 |
 `- net/
     |
     +- arp        - Address resolution protocol (IPv4)
     +- bluetooth  - PF_BLUETOOTH socket interface
     +- can        - SocketCAN
     +- devif      - Stack/device interface layer
     +- icmp       - Internet Control Message Protocol (IPv4)
     +- icmpv6     - Internet Control Message Protocol (IPv6)
     +- ieee802154 - PF_IEEE802154 socket interface
     +- igmp       - IGMPv2 client
     +- inet       - PF_INET/PF_INET6 socket interface
     +- ipforward  - IP forwarding logic
     +- ipfrag     - Fragmentation and reassembly
     +- local      - Unix domain (local) sockets
     +- mld        - Multicast Listener Discovery (MLD)
     +- nat        - Network Address Translation (NAT)
     +- neighbor   - Neighbor Discovery Protocol (IPv6)
     +- netdev     - Socket network device interface
     +- netfilter  - Iptables Interface
     +- netlink    - Netlink IPC socket interface
     +- pkt        - "Raw" packet socket support
     +- procfs     - net devices PROCFS support
     +- route      - Routing table support
     +- rpmsg      - Rpmsg domain (remote) sockets
     +- sixlowpan  - 6LoWPAN implementation
     +- socket     - BSD socket interface
     +- 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   |
  +----------------------------------------------------------------+ +--------------------------+