mirror of
https://github.com/apache/nuttx.git
synced 2026-05-20 20:44:39 +08:00
zhanghongyu
a0bd741387
otherwise, if the mld timers are not cancelled, an illegal address will be accessed after timeout. to avoid this scenario, when the network card is unregistered, all MLD timers must be attempted to be synchronously cancelled. Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
314 lines
8.6 KiB
C
314 lines
8.6 KiB
C
/****************************************************************************
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* net/mld/mld_group.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.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/queue.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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#ifndef CONFIG_NET_MLD_ROUTER
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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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#endif
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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 = 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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nxsem_init(&group->sem, 0, 0);
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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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}
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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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NTOHS(addr[0]), NTOHS(addr[1]), NTOHS(addr[2]), NTOHS(addr[3]),
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NTOHS(addr[4]), NTOHS(addr[5]), NTOHS(addr[6]), NTOHS(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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NTOHS(group->grpaddr[0]), NTOHS(group->grpaddr[1]),
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NTOHS(group->grpaddr[2]), NTOHS(group->grpaddr[3]),
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NTOHS(group->grpaddr[4]), NTOHS(group->grpaddr[5]),
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NTOHS(group->grpaddr[6]), NTOHS(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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/* Cancel the watchdog timer */
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wd_cancel(&group->polldog);
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/* Then release the group structure resources. */
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mldinfo("Call kmm_free()\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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/****************************************************************************
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* Name: mld_grpfree_all
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*
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* Description:
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* Release all previously allocated groups for a device.
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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_all(FAR struct net_driver_s *dev)
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{
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FAR struct mld_group_s *group =
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(FAR struct mld_group_s *)dev->d_mld.grplist.head;
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FAR struct mld_group_s *next;
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while (group != NULL)
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{
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next = group->next;
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mld_grpfree(dev, group);
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group = next;
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}
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}
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#endif /* CONFIG_NET_MLD */
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