IEEE 802.1D bridge
[NETIFs]

This file implements an IEEE 802.1D bridge by using a multilayer netif approach (one hardware-independent netif for the bridge that uses hardware netifs for its ports). More...

Detailed Description

This file implements an IEEE 802.1D bridge by using a multilayer netif approach (one hardware-independent netif for the bridge that uses hardware netifs for its ports).

On transmit, the bridge selects the outgoing port(s). On receive, the port netif calls into the bridge (via its netif->input function) and the bridge selects the port(s) (and/or its netif->input function) to pass the received pbuf to.

Usage:

• add the port netifs just like you would when using them as dedicated netif without a bridge
  • only NETIF_FLAG_ETHARP/NETIF_FLAG_ETHERNET netifs are supported as bridge ports
  • add the bridge port netifs without IPv4 addresses (i.e. pass 'NULL, NULL, NULL')
  • don't add IPv6 addresses to the port netifs!
• set up the bridge configuration in a global variable of type 'bridgeif_initdata_t' that contains
  • the MAC address of the bridge
  • some configuration options controlling the memory consumption (maximum number of ports and FDB entries)
  • e.g. for a bridge MAC address 00-01-02-03-04-05, 2 bridge ports, 1024 FDB entries + 16 static MAC entries: bridgeif_initdata_t mybridge_initdata = BRIDGEIF_INITDATA1(2, 1024, 16, ETH_ADDR(0, 1, 2, 3, 4, 5));
• add the bridge netif (with IPv4 config): struct netif bridge_netif; netif_add(&bridge_netif, &my_ip, &my_netmask, &my_gw, &mybridge_initdata, bridgeif_init, tcpip_input); NOTE: the passed 'input' function depends on BRIDGEIF_PORT_NETIFS_OUTPUT_DIRECT setting, which controls where the forwarding is done (netif low level input context vs. tcpip_thread)
• set up all ports netifs and the bridge netif

• When adding a port netif, NETIF_FLAG_ETHARP flag will be removed from a port to prevent ETHARP working on that port netif (we only want one IP per bridge not per port).
• When adding a port netif, its input function is changed to call into the bridge.

Typedef Documentation

Function Documentation