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/****************************************************************************
* net/igmp/igmp_mcastmac.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* The NuttX implementation of IGMP was inspired by the IGMP add-on for the
* lwIP TCP/IP stack by Steve Reynolds:
*
* Copyright (c) 2002 CITEL Technologies Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/uip/uip.h>
#include "uip/uip_internal.h"
#ifdef CONFIG_NET_IGMP
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: uip_mcastmac
*
* Description:
* Given an IP address (in network order), create a IGMP multicast MAC
* address.
*
****************************************************************************/
static void uip_mcastmac(uip_ipaddr_t *ip, FAR uint8_t *mac)
{
/* This mapping is from the IETF IN RFC 1700 */
mac[0] = 0x01;
mac[1] = 0x00;
mac[2] = 0x5e;
mac[3] = ip4_addr2(*ip) & 0x7f;
mac[4] = ip4_addr3(*ip);
mac[5] = ip4_addr4(*ip);
nvdbg("IP: %08x -> MAC: %02x%02x%02x%02x%02x%02x\n",
*ip, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: uip_addmcastmac
*
* Description:
* Add an IGMP MAC address to the device's MAC filter table.
*
****************************************************************************/
void uip_addmcastmac(FAR struct uip_driver_s *dev, FAR uip_ipaddr_t *ip)
{
uint8_t mcastmac[6];
nvdbg("Adding: IP %08x\n", *ip);
if (dev->d_addmac)
{
uip_mcastmac(ip, mcastmac);
dev->d_addmac(dev, mcastmac);
}
}
/****************************************************************************
* Name: uip_removemcastmac
*
* Description:
* Remove an IGMP MAC address from the device's MAC filter table.
*
****************************************************************************/
void uip_removemcastmac(FAR struct uip_driver_s *dev, FAR uip_ipaddr_t *ip)
{
uint8_t mcastmac[6];
nvdbg("Removing: IP %08x\n", *ip);
if (dev->d_rmmac)
{
uip_mcastmac(ip, mcastmac);
dev->d_rmmac(dev, mcastmac);
}
}
#endif /* CONFIG_NET_IGMP */
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