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- /****************************************************************************
- * net/mld/mld_group.c
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership. The
- * ASF licenses this file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance with the
- * License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <nuttx/compiler.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/net/net.h>
- #include <nuttx/net/netdev.h>
- #include <nuttx/net/ip.h>
- #include <nuttx/net/mld.h>
- #include "devif/devif.h"
- #include "mld/mld.h"
- #ifdef CONFIG_NET_MLD
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: mld_ngroups
- *
- * Description:
- * Return the number of groups joined by applications.
- *
- ****************************************************************************/
- static int mld_ngroups(FAR struct net_driver_s *dev)
- {
- FAR struct mld_group_s *group;
- int ngroups = 0;
- /* Count the number of groups in the group list */
- for (group = (FAR struct mld_group_s *)dev->d_mld.grplist.head;
- group != NULL;
- group = group->next)
- {
- ngroups++;
- }
- /* REVISIT: Subtract one for the IPv6 allnodes group. Why is this here?
- * what do we need it for? It was cloned from IGMP and is probably not
- * needed.
- */
- return ngroups > 0 ? ngroups - 1 : 0;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: mld_grpalloc
- *
- * Description:
- * Allocate a new group from heap memory.
- *
- * Assumptions:
- * The network is locked.
- *
- ****************************************************************************/
- FAR struct mld_group_s *mld_grpalloc(FAR struct net_driver_s *dev,
- FAR const net_ipv6addr_t addr)
- {
- FAR struct mld_group_s *group;
- mldinfo("addr: %08x dev: %p\n", *addr, dev);
- group = (FAR struct mld_group_s *)kmm_zalloc(sizeof(struct mld_group_s));
- mldinfo("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_ipv6addr_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;
- #ifndef CONFIG_NET_MLD_ROUTER
- /* Start the query timer if we are the Querier and this is the first
- * group member of the group.
- */
- if (mld_ngroups(dev) == 0)
- {
- mld_start_gentimer(dev, MSEC2TICK(MLD_QUERY_MSEC));
- }
- #endif
- /* Add the group structure to the list in the device structure */
- sq_addfirst((FAR sq_entry_t *)group, &dev->d_mld.grplist);
- }
- return group;
- }
- /****************************************************************************
- * Name: mld_grpfind
- *
- * Description:
- * Find an existing group.
- *
- * Assumptions:
- * The network is locked.
- *
- ****************************************************************************/
- FAR struct mld_group_s *mld_grpfind(FAR struct net_driver_s *dev,
- FAR const net_ipv6addr_t addr)
- {
- FAR struct mld_group_s *group;
- mldinfo("Searching for group: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
- addr[0], addr[1], addr[2], addr[3], addr[4], addr[5], addr[6],
- addr[7]);
- for (group = (FAR struct mld_group_s *)dev->d_mld.grplist.head;
- group;
- group = group->next)
- {
- mldinfo("Compare: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
- group->grpaddr[0], group->grpaddr[1], group->grpaddr[2],
- group->grpaddr[3], group->grpaddr[4], group->grpaddr[5],
- group->grpaddr[6], group->grpaddr[7]);
- if (net_ipv6addr_cmp(group->grpaddr, addr))
- {
- mldinfo("Match!\n");
- DEBUGASSERT(group->ifindex == dev->d_ifindex);
- break;
- }
- }
- return group;
- }
- /****************************************************************************
- * Name: mld_grpallocfind
- *
- * Description:
- * Find an existing group. If not found, create a new group for the
- * address.
- *
- ****************************************************************************/
- FAR struct mld_group_s *mld_grpallocfind(FAR struct net_driver_s *dev,
- FAR const net_ipv6addr_t addr)
- {
- FAR struct mld_group_s *group = mld_grpfind(dev, addr);
- mldinfo("group: %p addr: %08x\n", group, (int)*addr);
- if (!group)
- {
- group = mld_grpalloc(dev, addr);
- }
- mldinfo("group: %p\n", group);
- return group;
- }
- /****************************************************************************
- * Name: mld_grpfree
- *
- * Description:
- * Release a previously allocated group.
- *
- * Assumptions:
- * The network is locked.
- *
- ****************************************************************************/
- void mld_grpfree(FAR struct net_driver_s *dev, FAR struct mld_group_s *group)
- {
- mldinfo("Free: %p flags: %02x\n", group, group->flags);
- /* Cancel the timers */
- wd_cancel(&group->polldog);
- /* Remove the group structure from the group list in the device structure */
- sq_rem((FAR sq_entry_t *)group, &dev->d_mld.grplist);
- /* Destroy the wait semaphore */
- nxsem_destroy(&group->sem);
- /* Cancel the watchdog timer */
- wd_cancel(&group->polldog);
- /* Then release the group structure resources. */
- mldinfo("Call kmm_free()\n");
- kmm_free(group);
- #ifndef CONFIG_NET_MLD_ROUTER
- /* If there are no longer any groups, then stop the general query and v1
- * compatibility timers.
- */
- if (mld_ngroups(dev) == 0)
- {
- wd_cancel(&dev->d_mld.gendog);
- wd_cancel(&dev->d_mld.v1dog);
- }
- #endif
- }
- /****************************************************************************
- * Name: mld_new_pollcycle
- *
- * Description:
- * Update accumulated membership at the beginning of each new poll cycle
- *
- ****************************************************************************/
- #ifdef CONFIG_NET_MLD_ROUTER
- void mld_new_pollcycle(FAR struct net_driver_s *dev)
- {
- FAR struct mld_group_s *member;
- /* Update member ship in every group */
- for (member = (FAR struct mld_group_s *)dev->d_mld.grplist.head;
- member;
- member = member->next)
- {
- /* Save the number of members that reported in the previous query
- * cycle; reset the number of members that have reported in the new
- * query cycle.
- */
- member->lstmbrs = member->members;
- member->members = 0;
- }
- }
- #endif
- #endif /* CONFIG_NET_MLD */
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