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px4-firmware/nuttx/net/uip/uip_igmpgroup.c

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/****************************************************************************
* net/uip/uip_igmpgroup.c
* IGMP group data structure management 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 <nuttx/compiler.h>
#include <stdlib.h>
#include <string.h>
#include <wdog.h>
#include <queue.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include <nuttx/net/uip/uip.h>
#include <nuttx/net/uip/uip-igmp.h>
#include "uip_internal.h"
#ifdef CONFIG_NET_IGMP
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifdef CONFIG_NET_IPv6
# error "IGMP for IPv6 not supported"
#endif
#ifndef CONFIG_PREALLOC_IGMPGROUPS
# define CONFIG_PREALLOC_IGMPGROUPS 4
#endif
/* Debug ********************************************************************/
#undef IGMP_GRPDEBUG /* Define to enable detailed IGMP group debug */
#ifndef CONFIG_NET_IGMP
# undef IGMP_GRPDEBUG
#endif
#ifdef CONFIG_CPP_HAVE_VARARGS
# ifdef IGMP_GRPDEBUG
# define grpdbg(format, arg...) ndbg(format, ##arg)
# define grplldbg(format, arg...) nlldbg(format, ##arg)
# define grpvdbg(format, arg...) nvdbg(format, ##arg)
# define grpllvdbg(format, arg...) nllvdbg(format, ##arg)
# else
# define grpdbg(x...)
# define grplldbg(x...)
# define grpvdbg(x...)
# define grpllvdbg(x...)
# endif
#else
# ifdef IGMP_GRPDEBUG
# define grpdbg ndbg
# define grplldbg nlldbg
# define grpvdbg nvdbg
# define grpllvdbg nllvdbg
# else
# define grpdbg (void)
# define grplldbg (void)
# define grpvdbg (void)
# define grpllvdbg (void)
# endif
#endif
/****************************************************************************
* Private Data
****************************************************************************/
/* malloc() cannot be called from an interrupt handler. To work around this,
* a small number of IGMP groups are preallocated just for use in interrupt
* handling logic.
*/
#if CONFIG_PREALLOC_IGMPGROUPS > 0
static struct igmp_group_s g_preallocgrps[CONFIG_PREALLOC_IGMPGROUPS];
static FAR sq_queue_t g_freelist;
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: uip_grpalloc
*
* Description:
* Allocate a new group from heap memory.
*
* Assumptions:
* Calls malloc and so cannot be called from an interrupt handler.
*
****************************************************************************/
static inline FAR struct igmp_group_s *uip_grpheapalloc(void)
{
return (FAR struct igmp_group_s *)zalloc(sizeof(struct igmp_group_s));
}
/****************************************************************************
* Name: uip_grpprealloc
*
* Description:
* Allocate a new group from the pre-allocated groups.
*
* Assumptions:
* This function should only be called from an interrupt handler (or with
* interrupts disabled).
*
****************************************************************************/
#if CONFIG_PREALLOC_IGMPGROUPS > 0
static inline FAR struct igmp_group_s *uip_grpprealloc(void)
{
FAR struct igmp_group_s *group = (FAR struct igmp_group_s *)sq_remfirst(&g_freelist);
if (group)
{
memset(group, 0, sizeof(struct igmp_group_s));
group->flags = IGMP_PREALLOCATED;
}
return group;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: uip_grpinit
*
* Description:
* One-time initialization of group data.
*
* Assumptions:
* Called only during early boot phases (pre-multitasking).
*
****************************************************************************/
void uip_grpinit(void)
{
FAR struct igmp_group_s *group;
int i;
grplldbg("Initializing\n");
#if CONFIG_PREALLOC_IGMPGROUPS > 0
for (i = 0; i < CONFIG_PREALLOC_IGMPGROUPS; i++)
{
group = &g_preallocgrps[i];
sq_addfirst((FAR sq_entry_t *)group, &g_freelist);
}
#endif
}
/****************************************************************************
* Name: uip_grpalloc
*
* Description:
* Allocate a new group from heap memory.
*
* Assumptions:
* May be called from either user or interrupt level processing.
*
****************************************************************************/
FAR struct igmp_group_s *uip_grpalloc(FAR struct uip_driver_s *dev,
FAR const uip_ipaddr_t *addr)
{
FAR struct igmp_group_s *group;
uip_lock_t flags;
nllvdbg("addr: %08x dev: %p\n", *addr, dev);
if (up_interrupt_context())
{
#if CONFIG_PREALLOC_IGMPGROUPS > 0
grplldbg("Use a pre-allocated group entry\n");
group = uip_grpprealloc();
#else
grplldbg("Cannot allocate from interrupt handler\n");
group = NULL;
#endif
}
else
{
grplldbg("Allocate from the heap\n");
group = uip_grpheapalloc();
}
grplldbg("group: %p\n", group);
/* Check if we succesfully allocated a group structure */
if (group)
{
/* Initialize the non-zero elements of the group structure */
uip_ipaddr_copy(group->grpaddr, *addr);
sem_init(&group->sem, 0, 0);
/* Initialize the group timer (but don't start it yet) */
group->wdog = wd_create();
DEBUGASSERT(group->wdog);
/* Interrupts must be disabled in order to modify the group list */
flags = uip_lock();
/* Add the group structure to the list in the device structure */
sq_addfirst((FAR sq_entry_t*)group, &dev->grplist);
uip_unlock(flags);
}
return group;
}
/****************************************************************************
* Name: uip_grpfind
*
* Description:
* Find an existing group.
*
* Assumptions:
* May be called from either user or interrupt level processing.
*
****************************************************************************/
FAR struct igmp_group_s *uip_grpfind(FAR struct uip_driver_s *dev,
FAR const uip_ipaddr_t *addr)
{
FAR struct igmp_group_s *group;
uip_lock_t flags;
grplldbg("Searching for addr %08x\n", (int)*addr);
/* We must disable interrupts because we don't which context we were
* called from.
*/
flags = uip_lock();
for (group = (FAR struct igmp_group_s *)dev->grplist.head;
group;
group = group->next)
{
grplldbg("Compare: %08x vs. %08x\n", group->grpaddr, *addr);
if (uip_ipaddr_cmp(group->grpaddr, *addr))
{
grplldbg("Match!\n");
break;
}
}
uip_unlock(flags);
return group;
}
/****************************************************************************
* Name: uip_grpallocfind
*
* Description:
* Find an existing group. If not found, create a new group for the
* address.
*
* Assumptions:
* May be called from either user or interrupt level processing.
*
****************************************************************************/
FAR struct igmp_group_s *uip_grpallocfind(FAR struct uip_driver_s *dev,
FAR const uip_ipaddr_t *addr)
{
FAR struct igmp_group_s *group = uip_grpfind(dev, addr);
grplldbg("group: %p addr: %08x\n", group, (int)*addr);
if (!group)
{
group = uip_grpalloc(dev, addr);
}
grplldbg("group: %p\n", group);
return group;
}
/****************************************************************************
* Name: uip_grpfree
*
* Description:
* Release a previously allocated group.
*
* Assumptions:
* May be called from either user or interrupt level processing.
*
****************************************************************************/
void uip_grpfree(FAR struct uip_driver_s *dev, FAR struct igmp_group_s *group)
{
uip_lock_t flags;
grplldbg("Free: %p flags: %02x\n", group, group->flags);
/* Cancel the wdog */
flags = uip_lock();
wd_cancel(group->wdog);
/* Remove the group structure from the group list in the device structure */
sq_rem((FAR sq_entry_t*)group, &dev->grplist);
/* Destroy the wait semapore */
(void)sem_destroy(&group->sem);
/* Destroy the wdog */
wd_delete(group->wdog);
/* Then release the group structure resources. Check first if this is one
* of the pre-allocated group structures that we will retain in a free list.
*/
#if CONFIG_PREALLOC_IGMPGROUPS > 0
if (IS_PREALLOCATED(group->flags))
{
grplldbg("Put back on free list\n");
sq_addlast((FAR sq_entry_t*)group, &g_freelist);
uip_unlock(flags);
}
else
#endif
{
/* No.. deallocate the group structure. Use sched_free() just in case
* this function is executing within an interrupt handler.
*/
uip_unlock(flags);
grplldbg("Call sched_free()\n");
sched_free(group);
}
}
#endif /* CONFIG_NET_IGMP */
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