153 lines
5.1 KiB
C
153 lines
5.1 KiB
C
/****************************************************************************
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* net/uip/uip_udpinput.c
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* Handling incoming UDP input
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*
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Adapted for NuttX from logic in uIP which also has a BSD-like license:
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*
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* Original author Adam Dunkels <adam@dunkels.com>
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* Copyright () 2001-2003, Adam Dunkels.
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* All rights reserved.
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE 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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#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP)
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#include <debug.h>
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#include <net/uip/uipopt.h>
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#include <net/uip/uip.h>
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#include <net/uip/uip-arch.h>
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#include "uip_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define UDPBUF ((struct uip_udpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: uip_udpinput
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*
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* Description:
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* Handle incoming UDP input
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*
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* Parameters:
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* dev - The device driver structure containing the received UDP packet
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*
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* Return:
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* None
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*
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* Assumptions:
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* Called from the interrupt level or with interrupts disabled.
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*
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****************************************************************************/
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void uip_udpinput(struct uip_driver_s *dev)
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{
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struct uip_udp_conn *conn;
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struct uip_udpip_hdr *pbuf = UDPBUF;
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/* UDP processing is really just a hack. We don't do anything to the UDP/IP
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* headers, but let the UDP application do all the hard work. If the
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* application sets d_sndlen, it has a packet to send.
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*/
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dev->d_len -= UIP_IPUDPH_LEN;
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#ifdef CONFIG_NET_UDP_CHECKSUMS
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dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
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if (pbuf->udpchksum != 0 && uip_udpchksum(dev) != 0xffff)
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{
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#ifdef CONFIG_NET_STATISTICS
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uip_stat.udp.drop++;
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uip_stat.udp.chkerr++;
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#endif
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nlldbg("Bad UDP checksum\n");
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dev->d_len = 0;
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}
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else
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#endif
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{
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/* Demultiplex this UDP packet between the UDP "connections". */
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conn = uip_udpactive(pbuf);
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if (conn)
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{
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/* Setup for the application callback */
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dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
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dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
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dev->d_sndlen = 0;
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/* Perform the application callback */
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uip_udpcallback(dev, conn, UIP_NEWDATA);
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/* If the application has data to send, setup the UDP/IP header */
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if (dev->d_sndlen > 0)
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{
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uip_udpsend(dev, conn);
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}
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}
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else
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{
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nlldbg("No listener on UDP port\n");
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dev->d_len = 0;
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}
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}
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return;
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}
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#endif /* CONFIG_NET && CONFIG_NET_UDP */
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