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Diffstat (limited to 'nuttx/net/udp/udp_input.c')
-rw-r--r-- | nuttx/net/udp/udp_input.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/nuttx/net/udp/udp_input.c b/nuttx/net/udp/udp_input.c new file mode 100644 index 000000000..e2d7c434f --- /dev/null +++ b/nuttx/net/udp/udp_input.c @@ -0,0 +1,174 @@ +/**************************************************************************** + * net/udp/udp_input.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/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: + * OK The packet has been processed and can be deleted + * ERROR Hold the packet and try again later. There is a listening socket + * but no receive in place to catch the packet yet. + * + * Assumptions: + * Called from the interrupt level or with interrupts disabled. + * + ****************************************************************************/ + +int uip_udpinput(FAR struct uip_driver_s *dev) +{ + struct uip_udp_conn *conn; + struct uip_udpip_hdr *pbuf = UDPBUF; + int ret = OK; + +#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) + { + uint16_t flags; + + /* Set-up 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 */ + + flags = uip_udpcallback(dev, conn, UIP_NEWDATA); + + /* If the operation was successful, the UIP_NEWDATA flag is removed + * and thus the packet can be deleted (OK will be returned). + */ + + if ((flags & UIP_NEWDATA) != 0) + { + /* No.. the packet was not processed now. Return ERROR so + * that the driver may retry again later. + */ + + ret = ERROR; + } + + /* 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 ret; +} + +#endif /* CONFIG_NET && CONFIG_NET_UDP */ |