253 lines
7.4 KiB
C
253 lines
7.4 KiB
C
/****************************************************************************
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* net/igmp/igmp_group.c
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* IGMP group data structure management logic
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*
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* Copyright (C) 2010, 2013-2014, 2016 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 <nuttx/compiler.h>
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#include <stdlib.h>
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#include <string.h>
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#include <queue.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/wdog.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/net.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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/* Configuration ************************************************************/
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#ifdef CONFIG_NET_IPv6
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# error "IGMP for IPv6 not supported"
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#endif
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/* Debug ********************************************************************/
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#undef IGMP_GRPDEBUG /* Define to enable detailed IGMP group debug */
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#ifndef CONFIG_NET_IGMP
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# undef IGMP_GRPDEBUG
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#endif
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#ifdef CONFIG_CPP_HAVE_VARARGS
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# ifdef IGMP_GRPDEBUG
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# define grperr(format, ...) nerr(format, ##__VA_ARGS__)
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# define grpinfo(format, ...) ninfo(format, ##__VA_ARGS__)
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# else
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# define grperr(x...)
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# define grpinfo(x...)
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# endif
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#else
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# ifdef IGMP_GRPDEBUG
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# define grperr nerr
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# define grpinfo ninfo
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# else
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# define grperr (void)
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# define grpinfo (void)
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# endif
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: igmp_grpalloc
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*
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* Description:
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* Allocate a new group from heap memory.
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*
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****************************************************************************/
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FAR struct igmp_group_s *igmp_grpalloc(FAR struct net_driver_s *dev,
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FAR const in_addr_t *addr)
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{
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FAR struct igmp_group_s *group;
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ninfo("addr: %08x dev: %p\n", *addr, dev);
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group = (FAR struct igmp_group_s *)kmm_zalloc(sizeof(struct igmp_group_s));
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grpinfo("group: %p\n", group);
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/* Check if we successfully allocated a group structure */
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if (group != NULL)
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{
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/* Initialize the non-zero elements of the group structure */
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net_ipv4addr_copy(group->grpaddr, *addr);
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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nxsem_init(&group->sem, 0, 0);
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nxsem_setprotocol(&group->sem, SEM_PRIO_NONE);
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/* Initialize the group timer (but don't start it yet) */
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group->wdog = wd_create();
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DEBUGASSERT(group->wdog);
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/* Interrupts must be disabled in order to modify the group list */
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net_lock();
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/* Add the group structure to the list in the device structure */
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sq_addfirst((FAR sq_entry_t *)group, &dev->grplist);
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net_unlock();
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}
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return group;
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}
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/****************************************************************************
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* Name: igmp_grpfind
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*
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* Description:
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* Find an existing group.
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*
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****************************************************************************/
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FAR struct igmp_group_s *igmp_grpfind(FAR struct net_driver_s *dev,
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FAR const in_addr_t *addr)
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{
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FAR struct igmp_group_s *group;
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grpinfo("Searching for addr %08x\n", (int)*addr);
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net_lock();
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for (group = (FAR struct igmp_group_s *)dev->grplist.head;
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group;
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group = group->next)
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{
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grpinfo("Compare: %08x vs. %08x\n", group->grpaddr, *addr);
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if (net_ipv4addr_cmp(group->grpaddr, *addr))
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{
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grpinfo("Match!\n");
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break;
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}
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}
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net_unlock();
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return group;
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}
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/****************************************************************************
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* Name: igmp_grpallocfind
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*
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* Description:
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* Find an existing group. If not found, create a new group for the
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* address.
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*
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****************************************************************************/
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FAR struct igmp_group_s *igmp_grpallocfind(FAR struct net_driver_s *dev,
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FAR const in_addr_t *addr)
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{
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FAR struct igmp_group_s *group = igmp_grpfind(dev, addr);
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grpinfo("group: %p addr: %08x\n", group, (int)*addr);
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if (!group)
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{
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group = igmp_grpalloc(dev, addr);
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}
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grpinfo("group: %p\n", group);
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return group;
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}
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/****************************************************************************
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* Name: igmp_grpfree
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*
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* Description:
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* Release a previously allocated group.
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*
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****************************************************************************/
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void igmp_grpfree(FAR struct net_driver_s *dev, FAR struct igmp_group_s *group)
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{
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grpinfo("Free: %p flags: %02x\n", group, group->flags);
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/* Cancel the wdog */
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net_lock();
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wd_cancel(group->wdog);
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/* Remove the group structure from the group list in the device structure */
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sq_rem((FAR sq_entry_t *)group, &dev->grplist);
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/* Destroy the wait semaphore */
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(void)nxsem_destroy(&group->sem);
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/* Destroy the wdog */
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wd_delete(group->wdog);
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/* Then release the group structure resources. */
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net_unlock();
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grpinfo("Call sched_kfree()\n");
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sched_kfree(group);
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}
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#endif /* CONFIG_NET_IGMP */
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