/****************************************************************************
* net/uip/uip-udpsend.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <sys/types.h>
#include <debug.h>
#include <net/uip/uipopt.h>
#include <net/uip/uip.h>
#include <net/uip/uip-arch.h>
#include "uip-internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#define UDPBUF ((struct uip_udpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: uip_udpsend
*
* Description:
* Setup to send a UDP packet
*
* Parameters:
* dev - The device driver structure to use in the send operation
* conn - The UDP "connection" structure holding port information
*
* Return:
* None
*
* Assumptions:
* Called from the interrupt level or with interrupts disabled.
*
****************************************************************************/
void uip_udpsend(struct uip_driver_s *dev, struct uip_udp_conn *conn)
{
if (dev->d_sndlen == 0)
{
/* The total lenth to send is the size of the application data plus
* the IP and UDP headers (and, eventually, the ethernet header)
*/
dev->d_len = dev->d_sndlen + UIP_IPUDPH_LEN;
/* Initialize the IP header. Note that for IPv6, the IP length field
* does not include the IPv6 IP header length.
*/
#ifdef CONFIG_NET_IPv6
UDPBUF->vtc = 0x60;
UDPBUF->tcf = 0x00;
UDPBUF->flow = 0x00;
UDPBUF->len[0] = (dev->d_sndlen >> 8);
UDPBUF->len[1] = (dev->d_sndlen & 0xff);
UDPBUF->nexthdr = UIP_PROTO_UDP;
UDPBUF->hoplimit = conn->ttl;
uip_ipaddr_copy(UDPBUF->srcipaddr, &dev->d_ipaddr);
uip_ipaddr_copy(UDPBUF->destipaddr, &conn->ripaddr);
#else /* CONFIG_NET_IPv6 */
UDPBUF->vhl = 0x45;
UDPBUF->tos = 0;
UDPBUF->len[0] = (dev->d_len >> 8);
UDPBUF->len[1] = (dev->d_len & 0xff);
++g_ipid;
UDPBUF->ipid[0] = g_ipid >> 8;
UDPBUF->ipid[1] = g_ipid & 0xff;
UDPBUF->ipoffset[0] = 0;
UDPBUF->ipoffset[1] = 0;
UDPBUF->ttl = conn->ttl;
UDPBUF->proto = UIP_PROTO_UDP;
/* Calculate IP checksum. */
UDPBUF->ipchksum = 0;
UDPBUF->ipchksum = ~(uip_ipchksum(dev));
uiphdr_ipaddr_copy(UDPBUF->srcipaddr, &dev->d_ipaddr);
uiphdr_ipaddr_copy(UDPBUF->destipaddr, &conn->ripaddr);
#endif /* CONFIG_NET_IPv6 */
/* Initialize the UDP header */
UDPBUF->srcport = conn->lport;
UDPBUF->destport = conn->rport;
UDPBUF->udplen = HTONS(dev->d_sndlen + UIP_UDPH_LEN);
#ifdef CONFIG_NET_UDP_CHECKSUMS
/* Calculate UDP checksum. */
UDPBUF->udpchksum = ~(uip_udpchksum(dev));
if (UDPBUF->udpchksum == 0)
{
UDPBUF->udpchksum = 0xffff;
}
#else
UDPBUF->udpchksum = 0;
#endif /* UIP_UDP_CHECKSUMS */
vdbg("Outgoing UDP packet length: %d (%d)\n",
dev->d_len, (UDPBUF->len[0] << 8) | UDPBUF->len[1]);
#ifdef CONFIG_NET_STATISTICS
uip_stat.udp.sent++;
uip_stat.ip.sent++;
#endif
}
}
#endif /* CONFIG_NET && CONFIG_NET_UDP */
