317 lines
9.0 KiB
C
317 lines
9.0 KiB
C
/****************************************************************************
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* net/mld/mld_group.c
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* MLD group data structure management logic
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/mld.h>
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#include "devif/devif.h"
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#include "mld/mld.h"
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#ifdef CONFIG_NET_MLD
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_ngroups
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*
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* Description:
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* Return the number of groups joined by applications.
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*
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****************************************************************************/
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static int mld_ngroups(FAR struct net_driver_s *dev)
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{
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FAR struct mld_group_s *group;
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int ngroups = 0;
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/* Count the number of groups in the group list */
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for (group = (FAR struct mld_group_s *)dev->d_mld.grplist.head;
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group != NULL;
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group = group->next)
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{
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ngroups++;
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}
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/* REVISIT: Subtract one for the IPv6 allnodes group. Why is this here?
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* what do we need it for? It was cloned from IGMP and is probably not
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* needed.
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*/
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return ngroups > 0 ? ngroups - 1 : 0;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_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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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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FAR struct mld_group_s *mld_grpalloc(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t addr)
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{
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FAR struct mld_group_s *group;
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mldinfo("addr: %08x dev: %p\n", *addr, dev);
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group = (FAR struct mld_group_s *)kmm_zalloc(sizeof(struct mld_group_s));
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mldinfo("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_ipv6addr_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 timers */
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group->polldog = wd_create();
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DEBUGASSERT(group->polldog != NULL);
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if (group->polldog == NULL)
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{
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goto errout_with_sem;
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}
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/* Save the interface index */
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group->ifindex = dev->d_ifindex;
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#ifndef CONFIG_NET_MLD_ROUTER
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/* Start the query timer if we are the Querier and this is the first
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* group member of the group.
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*/
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if (mld_ngroups(dev) == 0)
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{
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mld_start_gentimer(dev, MSEC2TICK(MLD_QUERY_MSEC));
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}
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#endif
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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->d_mld.grplist);
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}
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return group;
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errout_with_sem:
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nxsem_destroy(&group->sem);
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kmm_free(group);
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return NULL;
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}
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/****************************************************************************
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* Name: mld_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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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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FAR struct mld_group_s *mld_grpfind(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t addr)
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{
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FAR struct mld_group_s *group;
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mldinfo("Searching for group: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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addr[0], addr[1], addr[2], addr[3], addr[4], addr[5], addr[6],
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addr[7]);
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for (group = (FAR struct mld_group_s *)dev->d_mld.grplist.head;
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group;
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group = group->next)
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{
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mldinfo("Compare: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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group->grpaddr[0], group->grpaddr[1], group->grpaddr[2],
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group->grpaddr[3], group->grpaddr[4], group->grpaddr[5],
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group->grpaddr[6], group->grpaddr[7]);
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if (net_ipv6addr_cmp(group->grpaddr, addr))
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{
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mldinfo("Match!\n");
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DEBUGASSERT(group->ifindex == dev->d_ifindex);
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break;
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}
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}
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return group;
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}
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/****************************************************************************
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* Name: mld_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 mld_group_s *mld_grpallocfind(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t addr)
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{
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FAR struct mld_group_s *group = mld_grpfind(dev, addr);
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mldinfo("group: %p addr: %08x\n", group, (int)*addr);
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if (!group)
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{
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group = mld_grpalloc(dev, addr);
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}
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mldinfo("group: %p\n", group);
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return group;
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}
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/****************************************************************************
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* Name: mld_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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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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void mld_grpfree(FAR struct net_driver_s *dev, FAR struct mld_group_s *group)
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{
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mldinfo("Free: %p flags: %02x\n", group, group->flags);
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/* Cancel the timers */
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wd_cancel(group->polldog);
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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->d_mld.grplist);
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/* Destroy the wait semaphore */
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nxsem_destroy(&group->sem);
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/* Destroy the timers */
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wd_delete(group->polldog);
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/* Then release the group structure resources. */
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mldinfo("Call sched_kfree()\n");
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kmm_free(group);
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#ifndef CONFIG_NET_MLD_ROUTER
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/* If there are no longer any groups, then stop the general query and v1
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* compatibility timers.
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*/
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if (mld_ngroups(dev) == 0)
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{
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wd_cancel(dev->d_mld.gendog);
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wd_cancel(dev->d_mld.v1dog);
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}
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#endif
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}
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/****************************************************************************
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* Name: mld_new_pollcycle
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*
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* Description:
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* Update accumulated membership at the beginning of each new poll cycle
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*
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****************************************************************************/
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#ifdef CONFIG_NET_MLD_ROUTER
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void mld_new_pollcycle(FAR struct net_driver_s *dev)
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{
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FAR struct mld_group_s *member;
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/* Update member ship in every group */
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for (member = (FAR struct mld_group_s *)dev->d_mld.grplist.head;
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member;
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member = member->next)
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{
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/* Save the number of members that reported in the previous query
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* cycle; reset the number of members that have reported in the new
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* query cycle.
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*/
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member->lstmbrs = member->members;
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member->members = 0;
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}
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}
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#endif
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#endif /* CONFIG_NET_MLD */
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