text: /****************************************************************************
   * net/devif/devif_forward.c
   *
   *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote
   *    products derived from this software without specific prior
   *    written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <string.h>
  #include <assert.h>
  #include <debug.h>
  
  #include <nuttx/mm/iob.h>
  #include <nuttx/net/netdev.h>
  
  #include "ipforward/ipforward.h"
  #include "devif/devif.h"
  
  #ifdef CONFIG_NET_IPFORWARD
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: devif_forward
   *
   * Description:
   *   Called from protocol-specific IP forwarding logic to re-send a packet.
   *
   * Input Parameters:
   *   fwd - An initialized instance of the common forwarding structure that
   *         includes everything needed to perform the forwarding operation.
   *
   * Returned Value:
   *   None
   *
   * Assumptions:
   *   The network is locked.
   *
   ****************************************************************************/
  
  void devif_forward(FAR struct forward_s *fwd)
  {
    unsigned int offset;
    int ret;
  
    DEBUGASSERT(fwd != NULL && fwd->f_iob != NULL && fwd->f_dev != NULL);
    offset = NET_LL_HDRLEN(fwd->f_dev);
  
    /* Copy the IOB chain that contains the L3L3 headers and any data payload */
  
    DEBUGASSERT(offset + fwd->f_iob->io_pktlen <= NETDEV_PKTSIZE(fwd->f_dev));
    ret = iob_copyout(&fwd->f_dev->d_buf[offset], fwd->f_iob,
                      fwd->f_iob->io_pktlen, 0);
  
    DEBUGASSERT(ret == fwd->f_iob->io_pktlen);
  
    fwd->f_dev->d_sndlen = 0;
    fwd->f_dev->d_len    = fwd->f_iob->io_pktlen;
  
    UNUSED(ret);
  }
  
  #endif /* CONFIG_NET_IPFORWARD */
  