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incubator-nuttx/net/udp/udp_send.c

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/****************************************************************************
* net/udp/udp_send.c
*
* Copyright (C) 2007-2009, 2011, 2015 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 <string.h>
#include <debug.h>
#include <assert.h>
#include <arpa/inet.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/netstats.h>
#include <nuttx/net/ip.h>
#include <nuttx/net/udp.h>
#include "devif/devif.h"
#include "utils/utils.h"
#include "udp/udp.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define IPv4BUF \
((struct ipv4_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
#define IPv6BUF \
((struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
#define UDPIPv4BUF \
((struct udp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv4_HDRLEN])
#define UDPIPv6BUF \
((struct udp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: udp_send
*
* Description:
* Set-up 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 udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn)
{
FAR struct udp_hdr_s *udp;
nllvdbg("UDP payload: %d (%d) bytes\n", dev->d_sndlen, dev->d_len);
if (dev->d_sndlen > 0)
{
/* Initialize the IP header. */
#ifdef CONFIG_NET_IPv4
#ifdef CONFIG_NET_IPv6
if (conn->domain == PF_INET ||
(conn->domain == PF_INET6 &&
ip6_is_ipv4addr((FAR struct in6_addr *)conn->u.ipv6.raddr)))
#endif
{
/* Get pointers to the IPv4 header and the offset TCP header */
FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
DEBUGASSERT(IFF_IS_IPv4(dev->d_flags));
udp = UDPIPv4BUF;
/* Initialize the IPv4 header. */
ipv4->vhl = 0x45;
ipv4->tos = 0;
++g_ipid;
ipv4->ipid[0] = g_ipid >> 8;
ipv4->ipid[1] = g_ipid & 0xff;
ipv4->ipoffset[0] = 0;
ipv4->ipoffset[1] = 0;
ipv4->ttl = conn->ttl;
ipv4->proto = IP_PROTO_UDP;
net_ipv4addr_hdrcopy(ipv4->srcipaddr, &dev->d_ipaddr);
#ifdef CONFIG_NET_IPv6
if (conn->domain == PF_INET6 &&
ip6_is_ipv4addr((FAR struct in6_addr *)conn->u.ipv6.raddr))
{
in_addr_t raddr = ip6_get_ipv4addr((FAR struct in6_addr *)conn->u.ipv6.raddr);
net_ipv4addr_hdrcopy(ipv4->destipaddr, &raddr);
}
else
#endif
{
net_ipv4addr_hdrcopy(ipv4->destipaddr, &conn->u.ipv4.raddr);
}
/* The total length to send is the size of the application data
* plus the IPv4 and UDP headers (and, eventually, the link layer
* header)
*/
dev->d_len = dev->d_sndlen + IPv4UDP_HDRLEN;
/* The IPv4 length includes the size of the IPv4 header */
ipv4->len[0] = (dev->d_len >> 8);
ipv4->len[1] = (dev->d_len & 0xff);
/* Calculate IP checksum. */
ipv4->ipchksum = 0;
ipv4->ipchksum = ~ipv4_chksum(dev);
#ifdef CONFIG_NET_STATISTICS
g_netstats.ipv4.sent++;
#endif
}
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
else
#endif
{
/* Get pointers to the IPv6 header and the offset TCP header */
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
DEBUGASSERT(IFF_IS_IPv6(dev->d_flags));
udp = UDPIPv6BUF;
/* Initialize the IPv6 header. Note that the IP length field
* does not include the IPv6 IP header length.
*/
ipv6->vtc = 0x60;
ipv6->tcf = 0x00;
ipv6->flow = 0x00;
ipv6->proto = IP_PROTO_UDP;
ipv6->ttl = conn->ttl;
net_ipv6addr_copy(ipv6->srcipaddr, dev->d_ipv6addr);
net_ipv6addr_copy(ipv6->destipaddr, conn->u.ipv6.raddr);
/* The IPv6 length, Includes the UDP header size but not the IPv6
* header size
*/
dev->d_len = dev->d_sndlen + UDP_HDRLEN;
ipv6->len[0] = (dev->d_len >> 8);
ipv6->len[1] = (dev->d_len & 0xff);
/* The total length to send is the size of the application data
* plus the IPv6 and UDP headers (and, eventually, the link layer
* header)
*/
dev->d_len += IPv6_HDRLEN;
#ifdef CONFIG_NET_STATISTICS
g_netstats.ipv6.sent++;
#endif
}
#endif /* CONFIG_NET_IPv6 */
/* Initialize the UDP header */
udp->srcport = conn->lport;
udp->destport = conn->rport;
udp->udplen = HTONS(dev->d_sndlen + UDP_HDRLEN);
udp->udpchksum = 0;
#ifdef CONFIG_NET_UDP_CHECKSUMS
/* Calculate UDP checksum. */
#ifdef CONFIG_NET_IPv4
#ifdef CONFIG_NET_IPv6
if (conn->domain == PF_INET ||
(conn->domain == PF_INET6 &&
ip6_is_ipv4addr((FAR struct in6_addr *)conn->u.ipv6.raddr)))
#endif
{
udp->udpchksum = ~udp_ipv4_chksum(dev);
}
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
else
#endif
{
udp->udpchksum = ~udp_ipv6_chksum(dev);
}
#endif /* CONFIG_NET_IPv6 */
if (udp->udpchksum == 0)
{
udp->udpchksum = 0xffff;
}
#endif /* CONFIG_NET_UDP_CHECKSUMS */
nllvdbg("Outgoing UDP packet length: %d\n", dev->d_len);
#ifdef CONFIG_NET_STATISTICS
g_netstats.udp.sent++;
#endif
}
}
#endif /* CONFIG_NET && CONFIG_NET_UDP */
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