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156 lines
5.2 KiB
156 lines
5.2 KiB
/**************************************************************************** |
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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, 2011 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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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 <nuttx/net/uip/uipopt.h> |
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#include <nuttx/net/uip/uip.h> |
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#include <nuttx/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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#ifdef CONFIG_NET_STATISTICS |
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uip_stat.udp.recv++; |
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#endif |
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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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