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incubator-nuttx/net/igmp/igmp_group.c

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/****************************************************************************
* net/igmp/igmp_group.c
* IGMP group data structure management logic
*
* Copyright (C) 2010, 2013-2014, 2016, 2018 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 <nuttx/compiler.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <queue.h>
#include <assert.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/arch.h>
#include <nuttx/wdog.h>
#include <nuttx/kmalloc.h>
#include <nuttx/semaphore.h>
#include <nuttx/net/net.h>
#include <nuttx/net/ip.h>
#include <nuttx/net/igmp.h>
#include "devif/devif.h"
#include "igmp/igmp.h"
#ifdef CONFIG_NET_IGMP
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Debug ********************************************************************/
#undef IGMP_GRPDEBUG /* Define to enable detailed IGMP group debug */
#ifndef CONFIG_NET_IGMP
# undef IGMP_GRPDEBUG
#endif
#ifdef IGMP_GRPDEBUG
# define grperr nerr
# define grpinfo ninfo
#else
# define grperr _none
# define grpinfo _none
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: igmp_grpalloc
*
* Description:
* Allocate a new group from heap memory.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
FAR struct igmp_group_s *igmp_grpalloc(FAR struct net_driver_s *dev,
FAR const in_addr_t *addr)
{
FAR struct igmp_group_s *group;
ninfo("addr: %08" PRIx32 " dev: %p\n", (uint32_t)*addr, dev);
group = (FAR struct igmp_group_s *)kmm_zalloc(sizeof(struct igmp_group_s));
grpinfo("group: %p\n", group);
/* Check if we successfully allocated a group structure */
if (group != NULL)
{
/* Initialize the non-zero elements of the group structure */
net_ipv4addr_copy(group->grpaddr, *addr);
/* This semaphore is used for signaling and, hence, should not have
* priority inheritance enabled.
*/
nxsem_init(&group->sem, 0, 0);
nxsem_set_protocol(&group->sem, SEM_PRIO_NONE);
/* Save the interface index */
group->ifindex = dev->d_ifindex;
/* Add the group structure to the list in the device structure */
sq_addfirst((FAR sq_entry_t *)group, &dev->d_igmp_grplist);
}
return group;
}
/****************************************************************************
* Name: igmp_grpfind
*
* Description:
* Find an existing group.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
FAR struct igmp_group_s *igmp_grpfind(FAR struct net_driver_s *dev,
FAR const in_addr_t *addr)
{
FAR struct igmp_group_s *group;
grpinfo("Searching for addr %08x\n", (int)*addr);
for (group = (FAR struct igmp_group_s *)dev->d_igmp_grplist.head;
group;
group = group->next)
{
grpinfo("Compare: %08" PRIx32 " vs. %08" PRIx32 "\n",
(uint32_t)group->grpaddr, (uint32_t)*addr);
if (net_ipv4addr_cmp(group->grpaddr, *addr))
{
grpinfo("Match!\n");
DEBUGASSERT(group->ifindex == dev->d_ifindex);
break;
}
}
return group;
}
/****************************************************************************
* Name: igmp_grpallocfind
*
* Description:
* Find an existing group. If not found, create a new group for the
* address.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
FAR struct igmp_group_s *igmp_grpallocfind(FAR struct net_driver_s *dev,
FAR const in_addr_t *addr)
{
FAR struct igmp_group_s *group = igmp_grpfind(dev, addr);
grpinfo("group: %p addr: %08x\n", group, (int)*addr);
if (!group)
{
group = igmp_grpalloc(dev, addr);
}
grpinfo("group: %p\n", group);
return group;
}
/****************************************************************************
* Name: igmp_grpfree
*
* Description:
* Release a previously allocated group.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
void igmp_grpfree(FAR struct net_driver_s *dev,
FAR struct igmp_group_s *group)
{
grpinfo("Free: %p flags: %02x\n", group, group->flags);
/* Cancel the wdog */
wd_cancel(&group->wdog);
/* Remove the group structure from the group list in the device structure */
sq_rem((FAR sq_entry_t *)group, &dev->d_igmp_grplist);
/* Destroy the wait semaphore */
nxsem_destroy(&group->sem);
/* Cancel the watchdog timer */
wd_cancel(&group->wdog);
/* Then release the group structure resources. */
grpinfo("Call kmm_free()\n");
kmm_free(group);
}
#endif /* CONFIG_NET_IGMP */
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