nuttx/net/igmp/igmp_init.c

/****************************************************************************
 * net/igmp/igmp_init.c
 * IGMP initialization logic
 *
 *   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/uip/uip.h>
#include <nuttx/net/uip/uip-igmp.h>

#include "uip/uip_internal.h"

#ifdef CONFIG_NET_IGMP

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#ifdef CONFIG_NET_IPv6
#  error "IGMP for IPv6 not supported"
#endif

/****************************************************************************
 * Public Data
 ****************************************************************************/

uip_ipaddr_t g_allsystems;
uip_ipaddr_t g_allrouters;

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name:  uip_igmpinit
 *
 * Description:
 *   Perform one-time IGMP initialization.
 *
 ****************************************************************************/

void uip_igmpinit(void)
{
  nvdbg("IGMP initializing\n");

  uip_ipaddr(g_allrouters, 224, 0, 0, 2);
  uip_ipaddr(g_allsystems, 224, 0, 0, 1);

  /* Initialize the group allocation logic */

  uip_grpinit();
}

/****************************************************************************
 * Name:  uip_igmpdevinit
 *
 * Description:
 *   Called when a new network device is registered to configure that device
 *   for IGMP support.
 *
 ****************************************************************************/

void uip_igmpdevinit(struct uip_driver_s *dev)
{
  nvdbg("IGMP initializing dev %p\n", dev);
  DEBUGASSERT(dev->grplist.head == NULL);

  /* Add the all systems address to the group */

  (void)uip_grpalloc(dev, &g_allsystems);

  /* Allow the IGMP messages at the MAC level */

  uip_addmcastmac(dev, &g_allrouters);
  uip_addmcastmac(dev, &g_allsystems);
}

#endif /* CONFIG_NET_IGMP */