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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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