163 lines
4.9 KiB
C
163 lines
4.9 KiB
C
/****************************************************************************
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* net/devif/devif_loopback.c
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*
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* Copyright (C) 2018 Pinecone Inc. All rights reserved.
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* Author: Xiang Xiao <xiaoxiang@pinecone.net>
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF 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 <string.h>
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#include <debug.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/pkt.h>
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#include <nuttx/net/netdev.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* This is a helper pointer for accessing the contents of the ip header */
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#define IPv4BUF ((FAR struct ipv4_hdr_s *)(dev->d_buf + dev->d_llhdrlen))
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#define IPv6BUF ((FAR struct ipv6_hdr_s *)(dev->d_buf + dev->d_llhdrlen))
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static bool is_loopback(FAR struct net_driver_s *dev)
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{
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if (dev->d_len > 0)
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{
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#ifdef CONFIG_NET_IPv4
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if ((IPv4BUF->vhl & IP_VERSION_MASK) == IPv4_VERSION &&
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net_ipv4addr_hdrcmp(IPv4BUF->destipaddr, &dev->d_ipaddr))
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{
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return true;
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}
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#endif
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#ifdef CONFIG_NET_IPv6
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if ((IPv6BUF->vtc & IP_VERSION_MASK) == IPv6_VERSION &&
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net_ipv6addr_hdrcmp(IPv6BUF->destipaddr, dev->d_ipv6addr))
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{
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return true;
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}
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#endif
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}
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return false;
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}
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/****************************************************************************
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* Name: devif_loopback
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*
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* Description:
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* This function should be called before sending out a packet. The function
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* checks the destination address of the packet to see whether the target of
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* packet is ourself and then consume the packet directly by calling input
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* process functions.
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*
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* Returned Value:
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* Zero is returned if the packet don't loop back to ourself, otherwise
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* a no zero value is returned.
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*
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****************************************************************************/
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int devif_loopback(FAR struct net_driver_s *dev)
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{
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if (!is_loopback(dev))
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{
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return 0;
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}
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/* Loop while if there is data "sent" to ourself.
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* Sending, of course, just means relaying back through the network.
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*/
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do
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{
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NETDEV_TXPACKETS(dev);
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NETDEV_RXPACKETS(dev);
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#ifdef CONFIG_NET_PKT
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/* When packet sockets are enabled, feed the frame into the packet tap */
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pkt_input(dev);
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#endif
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/* We only accept IP packets of the configured type */
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#ifdef CONFIG_NET_IPv4
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if ((IPv4BUF->vhl & IP_VERSION_MASK) == IPv4_VERSION)
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{
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ninfo("IPv4 frame\n");
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NETDEV_RXIPV4(dev);
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ipv4_input(dev);
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}
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else
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#endif
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#ifdef CONFIG_NET_IPv6
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if ((IPv6BUF->vtc & IP_VERSION_MASK) == IPv6_VERSION)
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{
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ninfo("Iv6 frame\n");
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NETDEV_RXIPV6(dev);
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ipv6_input(dev);
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}
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else
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#endif
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{
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NETDEV_RXDROPPED(dev);
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}
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NETDEV_TXDONE(dev);
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/* Add the link layer header length for the next loop */
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if (dev->d_len != 0)
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{
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dev->d_len += dev->d_llhdrlen;
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}
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}
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while (dev->d_len > 0);
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return 1;
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}
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