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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 "inet/inet.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
- *
- * Input Parameters:
- * dev - The device driver structure to use in the send operation
- * conn - The UDP "connection" structure holding port information
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked.
- *
- ****************************************************************************/
- void udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn)
- {
- FAR struct udp_hdr_s *udp;
- ninfo("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 UDP 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 UDP 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 */
- ninfo("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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