7a9457bb07
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5145 42af7a65-404d-4744-a932-0658087f49c3
157 lines
5.2 KiB
C
157 lines
5.2 KiB
C
/****************************************************************************
|
|
* net/uip/uip_udpinput.c
|
|
* Handling incoming UDP input
|
|
*
|
|
* Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Adapted for NuttX from logic in uIP which also has a BSD-like license:
|
|
*
|
|
* Original author Adam Dunkels <adam@dunkels.com>
|
|
* Copyright () 2001-2003, Adam Dunkels.
|
|
* All rights reserved.
|
|
*
|
|
* 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>
|
|
#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP)
|
|
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/net/uip/uipopt.h>
|
|
#include <nuttx/net/uip/uip.h>
|
|
#include <nuttx/net/uip/uip-arch.h>
|
|
|
|
#include "uip_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#define UDPBUF ((struct uip_udpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
|
|
|
|
/****************************************************************************
|
|
* Public Variables
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Variables
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: uip_udpinput
|
|
*
|
|
* Description:
|
|
* Handle incoming UDP input
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure containing the received UDP packet
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from the interrupt level or with interrupts disabled.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void uip_udpinput(struct uip_driver_s *dev)
|
|
{
|
|
struct uip_udp_conn *conn;
|
|
struct uip_udpip_hdr *pbuf = UDPBUF;
|
|
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
uip_stat.udp.recv++;
|
|
#endif
|
|
|
|
/* UDP processing is really just a hack. We don't do anything to the UDP/IP
|
|
* headers, but let the UDP application do all the hard work. If the
|
|
* application sets d_sndlen, it has a packet to send.
|
|
*/
|
|
|
|
dev->d_len -= UIP_IPUDPH_LEN;
|
|
#ifdef CONFIG_NET_UDP_CHECKSUMS
|
|
dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
|
|
if (pbuf->udpchksum != 0 && uip_udpchksum(dev) != 0xffff)
|
|
{
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
uip_stat.udp.drop++;
|
|
uip_stat.udp.chkerr++;
|
|
#endif
|
|
nlldbg("Bad UDP checksum\n");
|
|
dev->d_len = 0;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
/* Demultiplex this UDP packet between the UDP "connections". */
|
|
|
|
conn = uip_udpactive(pbuf);
|
|
if (conn)
|
|
{
|
|
/* Setup for the application callback */
|
|
|
|
dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
|
|
dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
|
|
dev->d_sndlen = 0;
|
|
|
|
/* Perform the application callback */
|
|
|
|
uip_udpcallback(dev, conn, UIP_NEWDATA);
|
|
|
|
/* If the application has data to send, setup the UDP/IP header */
|
|
|
|
if (dev->d_sndlen > 0)
|
|
{
|
|
uip_udpsend(dev, conn);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
nlldbg("No listener on UDP port\n");
|
|
dev->d_len = 0;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_UDP */
|