/************************************************************************
* NAME: fnet_arp_get_mac
*
* DESCRIPTION: Gets MAC address of valid ARP cache entry.
*************************************************************************/
fnet_bool_t fnet_arp_get_mac( fnet_netif_desc_t netif_desc, fnet_ip4_addr_t ip_addr, fnet_mac_addr_t mac_addr)
{
fnet_netif_t *netif = (fnet_netif_t *)netif_desc;
fnet_arp_if_t *arpif;
fnet_mac_addr_t *macaddr_p;
fnet_bool_t result = FNET_FALSE;
if(netif)
{
arpif = netif->arp_if_ptr;
if(arpif)
{
fnet_isr_lock();
macaddr_p = fnet_arp_lookup(netif, ip_addr);
if(macaddr_p)
{
if(mac_addr)
{
fnet_memcpy (mac_addr, *macaddr_p, sizeof(fnet_mac_addr_t));
}
result = FNET_TRUE;
}
fnet_isr_unlock();
}
}
return result;
}
void fnet_eth_output_ip4(fnet_netif_t *netif, fnet_ip4_addr_t dest_ip_addr, fnet_netbuf_t* nb)
{
fnet_mac_addr_t destination_addr; /* 48-bit destination address */
fnet_mac_addr_t * dest_ptr;
/* Construct Ethernet header. Start with looking up deciding which
* MAC address to use as a destination address. Broadcasts and
* multicasts are special, all other addresses are looked up in the
* ARP table. */
if(fnet_ip_addr_is_broadcast (dest_ip_addr, netif))
{
fnet_memcpy (destination_addr, fnet_eth_broadcast, sizeof(fnet_mac_addr_t));
}
else if(FNET_IP4_ADDR_IS_MULTICAST(dest_ip_addr))
{
/* Hash IP multicast address to MAC address. */
destination_addr[0] = 0x01;
destination_addr[1] = 0x0;
destination_addr[2] = 0x5e;
destination_addr[3] = (unsigned char)(FNET_IP4_ADDR2(dest_ip_addr)& 0x7f);
destination_addr[4] = (unsigned char)(FNET_IP4_ADDR3(dest_ip_addr));
destination_addr[5] = (unsigned char)(FNET_IP4_ADDR4(dest_ip_addr));
//TBD Use macro
}
else
/* Unicast address. */
{
if((dest_ptr = fnet_arp_lookup(netif, dest_ip_addr))!=0)
{
fnet_memcpy (destination_addr, *dest_ptr, sizeof(fnet_mac_addr_t));
}
else
{
fnet_arp_resolve(netif, dest_ip_addr, nb);
goto EXIT;
}
}
/* Send Ethernet frame. */
((fnet_eth_if_t *)(netif->if_ptr))->output(netif, FNET_ETH_TYPE_IP4, destination_addr, nb);
EXIT:
return;
}
