/**************************************************************************** * net/devif/devif_loopback.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 #include #include #include #include #include /**************************************************************************** * Private Functions ****************************************************************************/ static bool is_loopback(FAR struct net_driver_s *dev) { if (dev->d_len > 0) { #ifdef CONFIG_NET_IPv4 if ((IPv4BUF->vhl & IP_VERSION_MASK) == IPv4_VERSION && net_ipv4addr_hdrcmp(IPv4BUF->destipaddr, &dev->d_ipaddr)) { return true; } #endif #ifdef CONFIG_NET_IPv6 if ((IPv6BUF->vtc & IP_VERSION_MASK) == IPv6_VERSION && net_ipv6addr_hdrcmp(IPv6BUF->destipaddr, dev->d_ipv6addr)) { return true; } #endif } return false; } /**************************************************************************** * Name: devif_loopback * * Description: * This function should be called before sending out a packet. The function * checks the destination address of the packet to see whether the target * of packet is ourself and then consume the packet directly by calling * input process functions. * * Returned Value: * Zero is returned if the packet don't loop back to ourself, otherwise * a non-zero value is returned. * ****************************************************************************/ int devif_loopback(FAR struct net_driver_s *dev) { if (!is_loopback(dev)) { return 0; } /* Loop while if there is data "sent" to ourself. * Sending, of course, just means relaying back through the network. */ do { NETDEV_TXPACKETS(dev); NETDEV_RXPACKETS(dev); #ifdef CONFIG_NET_PKT /* When packet sockets are enabled, feed the frame into the tap */ pkt_input(dev); #endif /* We only accept IP packets of the configured type */ #ifdef CONFIG_NET_IPv4 if ((IPv4BUF->vhl & IP_VERSION_MASK) == IPv4_VERSION) { ninfo("IPv4 frame\n"); NETDEV_RXIPV4(dev); ipv4_input(dev); } else #endif #ifdef CONFIG_NET_IPv6 if ((IPv6BUF->vtc & IP_VERSION_MASK) == IPv6_VERSION) { ninfo("IPv6 frame\n"); NETDEV_RXIPV6(dev); ipv6_input(dev); } else #endif { NETDEV_RXDROPPED(dev); } NETDEV_TXDONE(dev); /* Add the link layer header length for the next loop */ if (dev->d_len != 0) { dev->d_len += dev->d_llhdrlen; } } while (dev->d_len > 0); return 1; }