157 lines
4.9 KiB
C
157 lines
4.9 KiB
C
/****************************************************************************
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* net/neighbor/neighbor_lookup.c
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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 <errno.h>
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#include <debug.h>
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#include <string.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/neighbor.h>
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#include "netdev/netdev.h"
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#include "neighbor/neighbor.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct neighbor_table_info_s
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{
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net_ipv6addr_t ni_ipaddr; /* IPv6 address for lookup */
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FAR struct neighbor_addr_s *ni_laddr; /* Location to return the link
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* layer address */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: neighbor_match
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*
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* Description:
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* This is a callback that checks if the network device has the
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* indicated IPv6 address assigned to it.
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*
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****************************************************************************/
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static int neighbor_match(FAR struct net_driver_s *dev, FAR void *arg)
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{
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FAR struct neighbor_table_info_s *info = arg;
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/* Check if the network device has been assigned the IP address of the
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* lookup.
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*/
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if (!NETDEV_IS_MY_V6ADDR(dev, info->ni_ipaddr))
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{
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return 0;
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}
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/* Yes.. Return the matching link layer address if the caller of
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* neighbor_lookup() provided a non-NULL location.
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*/
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if (info->ni_laddr != NULL)
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{
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info->ni_laddr->na_lltype = dev->d_lltype;
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info->ni_laddr->na_llsize = netdev_lladdrsize(dev);
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memcpy(&info->ni_laddr->u, &dev->d_mac, info->ni_laddr->na_llsize);
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}
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/* Return success in any event */
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return 1;
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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: neighbor_lookup
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*
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* Description:
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* Find an entry in the Neighbor Table and return its link layer address.
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*
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* Input Parameters:
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* ipaddr - The IPv6 address to use in the lookup;
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* laddr - Location to return the corresponding link layer address.
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* This address may be NULL. In that case, this function may be
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* used simply to determine if the link layer address is
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* available.
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*
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* Returned Value:
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* Zero (OK) if the link layer address is returned. A negated errno value
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* is returned on any error.
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*
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****************************************************************************/
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int neighbor_lookup(FAR const net_ipv6addr_t ipaddr,
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FAR struct neighbor_addr_s *laddr)
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{
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FAR struct neighbor_entry_s *neighbor;
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struct neighbor_table_info_s info;
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/* Check if the IPv6 address is already in the neighbor table. */
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neighbor = neighbor_findentry(ipaddr);
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if (neighbor != NULL)
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{
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/* Yes.. return the link layer address if the caller has provided a
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* non-NULL address in 'laddr'.
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*/
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if (laddr != NULL)
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{
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memcpy(laddr, &neighbor->ne_addr, sizeof(*laddr));
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}
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/* Return success in any case meaning that a valid link layer
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* address mapping is available for the IPv6 address.
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*/
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return OK;
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}
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/* No.. check if the IPv6 address is the address assigned to a local
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* network device. If so, return a mapping of that IPv6 address
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* to the linker layer address assigned to the network device.
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*/
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net_ipv6addr_copy(info.ni_ipaddr, ipaddr);
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info.ni_laddr = laddr;
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if (netdev_foreach(neighbor_match, &info) != 0)
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{
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return OK;
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}
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/* Not found */
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return -ENOENT;
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}
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