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