147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/****************************************************************************
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* net/devif/devif_loopback.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 <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
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* of packet is ourself and then consume the packet directly by calling
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* input 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 non-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 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("IPv6 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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