5a508351e4
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@398 42af7a65-404d-4744-a932-0658087f49c3
366 lines
10 KiB
C
366 lines
10 KiB
C
/****************************************************************************
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* net/uip/uip-tcpsend.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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_TCP)
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#include <sys/types.h>
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#include <debug.h>
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#include <net/uip/uipopt.h>
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#include <net/uip/uip.h>
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#include <net/uip/uip-arch.h>
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#include "uip-internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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#define BUF ((struct uip_tcpip_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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* Name: uip_tcpsendcomplete
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*
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* Description:
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* Complete the final portions of the send operation. This function sets
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* up IP header and computes the TCP checksum
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*
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* Parameters:
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* dev - The device driver structure to use in the send operation
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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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static void uip_tcpsendcomplete(struct uip_driver_s *dev)
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{
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BUF->ttl = UIP_TTL;
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#ifdef CONFIG_NET_IPv6
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/* For IPv6, the IP length field does not include the IPv6 IP header
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* length.
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*/
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BUF->len[0] = ((dev->d_len - UIP_IPH_LEN) >> 8);
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BUF->len[1] = ((dev->d_len - UIP_IPH_LEN) & 0xff);
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#else /* CONFIG_NET_IPv6 */
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BUF->len[0] = (dev->d_len >> 8);
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BUF->len[1] = (dev->d_len & 0xff);
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#endif /* CONFIG_NET_IPv6 */
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BUF->urgp[0] = BUF->urgp[1] = 0;
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/* Calculate TCP checksum. */
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BUF->tcpchksum = 0;
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BUF->tcpchksum = ~(uip_tcpchksum(dev));
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#ifdef CONFIG_NET_IPv6
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BUF->vtc = 0x60;
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BUF->tcf = 0x00;
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BUF->flow = 0x00;
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#else /* CONFIG_NET_IPv6 */
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BUF->vhl = 0x45;
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BUF->tos = 0;
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BUF->ipoffset[0] = 0;
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BUF->ipoffset[1] = 0;
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++g_ipid;
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BUF->ipid[0] = g_ipid >> 8;
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BUF->ipid[1] = g_ipid & 0xff;
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/* Calculate IP checksum. */
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BUF->ipchksum = 0;
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BUF->ipchksum = ~(uip_ipchksum(dev));
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#endif /* CONFIG_NET_IPv6 */
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vdbg("Outgoing TCP packet length: %d (%d)\n",
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dev->d_len, (BUF->len[0] << 8) | BUF->len[1]);
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#ifdef CONFIG_NET_STATISTICS
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uip_stat.tcp.sent++;
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uip_stat.ip.sent++;
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#endif
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}
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/****************************************************************************
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* Name: uip_tcpsendcommon
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*
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* Description:
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* We're done with the input processing. We are now ready to send a reply
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* Our job is to fill in all the fields of the TCP and IP headers before
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* calculating the checksum and finally send the packet.
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*
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* Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The TCP connection structure holding connection information
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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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static void uip_tcpsendcommon(struct uip_driver_s *dev, struct uip_conn *conn)
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{
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BUF->ackno[0] = conn->rcv_nxt[0];
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BUF->ackno[1] = conn->rcv_nxt[1];
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BUF->ackno[2] = conn->rcv_nxt[2];
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BUF->ackno[3] = conn->rcv_nxt[3];
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BUF->seqno[0] = conn->snd_nxt[0];
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BUF->seqno[1] = conn->snd_nxt[1];
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BUF->seqno[2] = conn->snd_nxt[2];
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BUF->seqno[3] = conn->snd_nxt[3];
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BUF->proto = UIP_PROTO_TCP;
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BUF->srcport = conn->lport;
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BUF->destport = conn->rport;
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uiphdr_ipaddr_copy(BUF->srcipaddr, &dev->d_ipaddr);
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uiphdr_ipaddr_copy(BUF->destipaddr, &conn->ripaddr);
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if (conn->tcpstateflags & UIP_STOPPED)
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{
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/* If the connection has issued uip_stop(), we advertise a zero
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* window so that the remote host will stop sending data.
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*/
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BUF->wnd[0] = 0;
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BUF->wnd[1] = 0;
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}
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else
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{
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BUF->wnd[0] = ((CONFIG_NET_RECEIVE_WINDOW) >> 8);
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BUF->wnd[1] = ((CONFIG_NET_RECEIVE_WINDOW) & 0xff);
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}
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/* Finish the IP portion of the message, calculate checksums and send
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* the message.
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*/
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uip_tcpsendcomplete(dev);
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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_tcpsend
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*
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* Description:
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* Setup to send a TCP packet
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*
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* Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The TCP connection structure holding connection information
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* flags - flags to apply to the TCP header
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* len - length of the message
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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_tcpsend(struct uip_driver_s *dev, struct uip_conn *conn, uint8 flags, uint16 len)
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{
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BUF->flags = flags;
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dev->d_len = len;
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BUF->tcpoffset = (UIP_TCPH_LEN / 4) << 4;
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uip_tcpsendcommon(dev, conn);
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}
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/****************************************************************************
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* Name: uip_tcpreset
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*
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* Description:
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* Send a TCP reset (no-data) message
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*
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* Parameters:
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* dev - The device driver structure to use in the send operation
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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_tcpreset(struct uip_driver_s *dev)
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{
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uint16 tmp16;
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uint8 seqbyte;
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#ifdef CONFIG_NET_STATISTICS
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uip_stat.tcp.rst++;
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#endif
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BUF->flags = TCP_RST | TCP_ACK;
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dev->d_len = UIP_IPTCPH_LEN;
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BUF->tcpoffset = 5 << 4;
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/* Flip the seqno and ackno fields in the TCP header. */
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seqbyte = BUF->seqno[3];
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BUF->seqno[3] = BUF->ackno[3];
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BUF->ackno[3] = seqbyte;
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seqbyte = BUF->seqno[2];
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BUF->seqno[2] = BUF->ackno[2];
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BUF->ackno[2] = seqbyte;
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seqbyte = BUF->seqno[1];
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BUF->seqno[1] = BUF->ackno[1];
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BUF->ackno[1] = seqbyte;
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seqbyte = BUF->seqno[0];
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BUF->seqno[0] = BUF->ackno[0];
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BUF->ackno[0] = seqbyte;
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/* We also have to increase the sequence number we are
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* acknowledging. If the least significant byte overflowed, we need
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* to propagate the carry to the other bytes as well.
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*/
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if (++(BUF->ackno[3]) == 0)
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{
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if (++(BUF->ackno[2]) == 0)
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{
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if (++(BUF->ackno[1]) == 0)
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{
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++(BUF->ackno[0]);
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}
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}
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}
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/* Swap port numbers. */
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tmp16 = BUF->srcport;
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BUF->srcport = BUF->destport;
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BUF->destport = tmp16;
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/* Swap IP addresses. */
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uiphdr_ipaddr_copy(BUF->destipaddr, BUF->srcipaddr);
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uiphdr_ipaddr_copy(BUF->srcipaddr, &dev->d_ipaddr);
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/* And send out the RST packet */
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uip_tcpsendcomplete(dev);
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}
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/****************************************************************************
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* Name: uip_tcpack
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*
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* Description:
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* Send the SYN or SYNACK response.
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*
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* Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The TCP connection structure holding connection information
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* ack - The ACK response to send
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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_tcpack(struct uip_driver_s *dev, struct uip_conn *conn, uint8 ack)
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{
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/* Save the ACK bits */
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BUF->flags = ack;
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/* We send out the TCP Maximum Segment Size option with our ack. */
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BUF->optdata[0] = TCP_OPT_MSS;
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BUF->optdata[1] = TCP_OPT_MSS_LEN;
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BUF->optdata[2] = (UIP_TCP_MSS) / 256;
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BUF->optdata[3] = (UIP_TCP_MSS) & 255;
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dev->d_len = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN;
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BUF->tcpoffset = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) << 4;
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/* Complete the common portions of the TCP message */
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uip_tcpsendcommon(dev, conn);
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}
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#endif /* CONFIG_NET && CONFIG_NET_TCP */
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