79 lines
3.0 KiB
C
79 lines
3.0 KiB
C
/****************************************************************************
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* net/neighbor/neighbor_out.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/net/net.h>
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#include <nuttx/net/netdev.h>
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#include "neighbor/neighbor.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: neighbor_out
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*
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* Description:
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* This function should be called before sending out an IPv6 packet. The
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* function checks the destination IPv6 address of the IPv6 packet to see
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* what L2 address that should be used as a destination L2 address.
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*
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* If the destination IPv6 address is in the local network (determined
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* by logical ANDing of netmask and our IPv6 address), the function
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* checks the Neighbor Table to see if an entry for the destination IPv6
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* address is found. If so, an L2 header is pre-pended at the beginning
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* of the packet and the function returns.
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*
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* If no Neighbor Table entry is found for the destination IPv6 address,
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* the packet in the d_buf is replaced by an ICMPv6 Neighbor Solicit
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* request packet for the IPv6 address. The IPv6 packet is dropped and
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* it is assumed that the higher level protocols (e.g., TCP) eventually
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* will retransmit the dropped packet.
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*
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* Upon return in either the case, a packet to be sent is present in the
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* d_buf buffer and the d_len field holds the length of the L2 frame that
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* should be transmitted.
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*
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****************************************************************************/
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void neighbor_out(FAR struct net_driver_s *dev)
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{
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switch (dev->d_lltype)
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{
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#ifdef CONFIG_NET_ETHERNET
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case NET_LL_ETHERNET:
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case NET_LL_IEEE80211:
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neighbor_ethernet_out(dev);
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break;
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#endif
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default:
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break;
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}
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}
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